Translation from English in to Armenian

Question: "There is currently no active translator for this translation, please consider becoming a translator as your suggestion might otherwise remain unreviewed". i see this message in top of the window while suggesting a translations so can you please help me to figure out how to became a translator?
Thank you.
Answer: You can start contributing your translations here:
https://l10n.elementary.io
Comment: I've already did that. I just don't want my translation suggestions remain unreviewed.

Translation from English in to Armenian


Why doesn't my garage door close unless I am holding down the button?

Question: When I push my inside of garage button for the door to close, the door attempts to go down, motor light flashes and door goes back up again. I had to keep holding the wall button for the door to actually go down and close.
Comment: Check the owners manual, the pattern with which the lights flash often indicates the problem.
Answer: The garage door will automatically reverse if it encounters too much resistance or if the sensor beam is interrupted.
To check for resistance, start with the door closed and pull the red handle. Then open and close the door. The movement should be fluid with no tough spots. If you encounter difficult spots, you likely have a bent track, a broken wheel, or a severe lack of track lubricant. Call a professional.
If the door opens with the opener fine, but reverses almost immediately when you try to close it, then you likely have a problem with your sensor alignment. One sensor should have a light on all the time. This is the transmitter. The other, your receiver,  should light up when it has an unobstructed view of the invisible light beam the transmitter sends. It's easy to bump a sensor and move it out of alignment. Just bend it back in to position. Use the light on the receiver to help you so that you don't have to try and close the door to check your adjustments.
Comment: Here is a video explaining the process: https://www.youtube.com/watch?v=QmB-Lg-T9fk I was able to fix my door with the same problem.
Comment: I would do the alignment check first, that way you avoid the hassle of latching the door back after pulling the handle. On some doors this can be a pain. checking the alignment only requires pointing the sensor correctly
Answer: I'd like to add to the thread my experience/observation: same situation - won't close unless you hold the inside button, 10 flashes as the error.
Both of my sensors "appeared" to be working. That is, the amber emitter would cause the green receiver to light when I had them aligned, and the green receiver would go out if I blocked the beam, so as I said, it "appeared" to be working.
The cause was corrosion on the receiver wires. Both wires were cut by a critter a few years ago. I spliced them back but moisture and weather resulted in just enough resistance on the line to provide inconsistent feedback and trigger the safety override. I cut out the bad copper and soldered a new splice which I sealed with liquid tape and all is well again.
In summary, If both sensors are lit and you get response from blocking the beam, check the green receiver wiring (the emitter would not have the same issue). With a multimeter you could look for voltage fluctuation or resistance, or just visually inspect for breaks in the line insulation and black or green copper wiring. It's much more likely the wire than the sensor so why waste the money?
Comment: Same thing, lights were on on sensors and they appeared to be working.
Comment: +1 for the sensors appeared to be working (cutting out when standing in the way), but they still had an issue. Mine would only close if I held it at the wall - I saw lots of advice elsewhere to clean the sensors with alcohol, and  I was positive it wouldn't help, but it does seem to have fixed the problem. So don't always believe the lights!
Comment: Wow. Same thing here. Sensors appeared to be working, but the problem went away after cleaning the transmitter and receiver lenses with alcohol.
Answer: I had this issue last week. The lights on the sensor were fine. The issue was finally traced to loose connections at the sensors. Disconnected the sensors, re-stripped the wires and reconnected them. Door closes fine now.
I think the sensors were working fine until the garage door starts moving, when the electrical supply to the sensors were getting interrupted due to faulty wiring.
Comment: This helped me a lot. My sensor was loose and moved off from its position in the casing. I just placed it right and tightened the screw and viola!, everything started working. Thanks a lot. You saved me a lot of money..
Comment: You should up-vote me, so I can get some badly needed reputation :)
Answer: 3 most common problems with garage doors that won't close are:
The sensor is either blocked by an object
The sensor caught some dirt.
The sensor is not aligned
What to do when your garage door won't close
Answer: Besides @longneck's excellent points, if the garage door or opener is a new installation and has not worked before, it could be that the opener's internal "tension sensor" is not correctly set.
If the door can be reasonably easily opened and closed by hand, but the opener balks at closing the door, the tension setting probably needs to be increased.  See the installation manual for details how to adjust it.  Usually it is a nut inside the unit, or sometimes a thumbwheel.
Answer: When nothing here works...determine what is spoofing the auto reverse.  I have an insulated door.  Part of the sheeting over the insulation are peeling away due to excess heat (and kids pickng at it). The flap of sheeting on the lower most panel was triggering he reverse when the door got to within an inch or two from closing. Trimmed the flap of sheeting back and presto...worked every time.
Answer: Sensor lights were out (there is a green and red LED light on each sensor side). I moved an extension ladder that must have "jiggled" the wires at the ceiling corner that powers the sensors. I went up and " re-jiggled"  the wires at ceiling and LED lights came on. Garage door now shuts normally. Try this if all else fails as in my case.
Comment: Hello, and welcome to Stack Exchange. Your answer is somewhat confusing; are you relating a similar situation that happened to you? Either way, you should edit your answer to make it clearer.
Answer: Both of my sensors were working (green receiver goes out only if beam blocked). I noticed one light bulb blinked when closing door. I decided to remove the bulb and give it a try. Well, the door closes fine now. I don't need the second light so I don't bother to find out if it was the bulb or the connection on the opener that caused the problem on closing.
Answer: Try turning it off and back on again. Seriously.
Both the red light and green light were always lit on my sensors. Unplugging them from the power for a few seconds before plugging it back in did the trick.


How to emphasize certain words in subtitles using mencoder?

Question: I'm using "mencoder" application to add subtitles to an AVI file. In the subtitles, there are certain words I want to emphasize by making them appear either in bold or in italics. I've tried surrounding them with HTML code but it doesn't work. I've tried both .srt and .ssa files with mencoder. How to emphasize certain words in subtitles using mencoder?
Answer: Save your subtitle in an ASS format (e.g. you can create one with the free Aegisub editor) and then make sure to add the following options to mencoder:
<code>-ass -vf ass,fixpts
</code>
You may also want to specify the subtitle's code page (in this example UTF-8) by adding these options:
<code>-subcp utf8 -utf8
</code>


Why stirring an over-fermented sourdough starter caused it to rise a second time to about double the original size?

Question: After feeding my sourdough starter, I let it rise to about 2.5x the original height. It eventually collapsed. 24 hours later, after it was well over fermented, I stirred the starter with a spoon. It then suddenly grew back to 2x in about 1 to 2 hours, without adding any water or flour. Can anyone explain this phenomenon?
Answer: You actually kneaded the dough. This puts some of the flour and water into contact with yeast that didn't have access to food cause it already ate all its sources within their grasp. Feeding these yeast cells this way caused the second rise, a common method in bread making.
Comment: I'm not sure this is what the OP is describing.  He fed his starter.  After it consumed the "food", he stirred without adding more flour.  I assume that means it was well mixed to begin with.  @Pat should clarify this point.
Comment: So if I understand, even after mixing the starer well, there will still be portion of flour that haven't been consumed by the yeast in the starter even hours later and by agitating it again, it allows the yeast to get in contact with unconsumed flour that was already there but for some reason was inaccessible to the yeast in the first rise?
Comment: @Pat Yes.......


What applications can utilise the Logitech G15 LCD screen?

Question: I am about to pick up a new computer today, complete with a Logitech G15 keyboard.  I primarily play Team Fortress 2, though certainly not exclusively.  I believe I can use Fraps to report on the frame rate of any game I'm playing.  Any other cool programs I can use with my G15?
Comment: While this is a good question, I still find it entertaining that people want little things to show up on their keyboard, when they should be looking at the monitor. I personally use a Das keyboard and as such never look at it.
Comment: @darkhelmet: Generally when you're playing a full screen game (assuming a single monitor) there's nowhere for a clock etc. (except with mods like for WoW).
Comment: Exactly, you want your game data on the monitor. The display on the keyboard is to show you other stuff like: clock, what track is playing in winamp, who is talking on Teamspeak/Vent, etc.
Comment: Most of the time I find that stuff doesn't matter when I'm playing a game, but to each their own.
Answer: As a former citizen (captive?) of the World Of Warcraft, the most useful function of the LCD was the Ventrilo display (built into any recent version of the application) that listed the names of people who were talking. Very handy when playing a fullscreen game.
Answer: LcdStudio Is a nice program for making custom displays for the LCD screen on the G15. Check out their forums for some pretty nice pre-made ones. Also: more pre-made LcdStudio configurations here.
Answer: For TF2 there is a custom display that you can use to show your current class, kills, deaths, etc.
Answer: The G15 Wikipedia page has a pretty good list of supported apps and links to plugins that you may need.
Answer: Honestly? I have a G15 now and I've never used the screen in TF2. I couldn't find anything worthwhile for it other than the built-in clock module. The side keys are handy but only use 1 bank, rather than the 3 available. Nothing that couldn't be handled by an unused key on the keyboard though.
If you play WoW, or some sort of RTS/RPG that requires you to have a full in-depth overview of the game, with all the usual keyboard tricks then this is a good keyboard (my stepdad plays WoW with it and uses the key banks a lot). For casual gaming you probably won't use much of the features though (but the media keys are handy to have - not uncommon though).
If you're a night owl the 2 levels of keyboard backlighting are useful - it can be very bright but there's a dimmer mode.
As far as typing goes it's a pretty sturdy keyboard. Standard layout - and perhaps you can find a use for the G1-G6 special keys in your editor if you're a programmer. If the keyboard comes with the PC then take it, if you're paying extra you might be wasting your money for things you don't need though.
Comment: For TF2 I use the macro keys for quick spy cloaks, but that's it.
Answer: I use a program called LCD Miscellany.
This keeps an eye on my CPU temps, download/upload speeds, memory etc. and I often use the G15 media display to skip tracks and listen to music whilst playing TF2.


remove protruding brick on LR chimney

Question: In our living room over the firebox we would like to hand a flat screen TV.  The design of the brick is a Running or Stretcher bond but it has 4 brick protruding from it.  Specifically About one third of the way above the fire box on the outside wall there is
Centered on one side two brick with their "header edges" protruding, half a brick width from the wall and then another one third up the wall, centered on the other side there is the same.  My question is how to best remove the parts of these four brick protruding and flatten the wall ?  home built in late 1970's
Comment: Pictures would help in this regard. although what you describe is quite sufficient.
Answer: I would not break or cut the bricks, someday you (or someone else) may want to move the TV and have a wall that is still aesthetically pleasing. Cut or chiseled bricks just won't look right.
Use wood (or some other material) blocks to "fur" the wall out. In other words, mount the TV off of the wall the same distance that the bricks protrude.
Answer: The easiest way to solve your problem is to break the bricks off (ie in half). The problem there is that you want to ensure you get a nice, clean cut.
You will Need a brick chisel, grinder, diamond blade and a hammer.
Step1. Cut 3 Relief cuts on each brick. Three cuts because you will not cut a relief cut on the surface which you will be chiselling. (I would apply the chisel on one of the long brick face surfaces. Try to get the relief cuts flush with the wall, and make sure they all line up.
Step 2: get your chisel and place it on the face of the brick with no relief cut and Knock hard with hammer. you should get a clean break
Step 3: use the diamond blade and the grinder to "clean" any edges away from the brick by lightly grinding any irregular spots.

remove protruding brick on LR chimney


loves you ♡

Question: I've been touching my cat for a while and just now a message appeared at the bottom-left corner (where all the other messages like "it's time to sleep" and "festival begins" appear). What does this mean for me and my cat?
Answer: Pets, like other animals, have a meter of how happy they are. For your pet this is hidden.
Pets don't produce items but there is a benefit to having a happy pet at the end of year 2 when

 Grandpa evaluates your performance. A pet that loves you is worth 1 point, which contributes to your rating.
Comment: note that [spoiler] can be re-evaluated at will if you have diamonds, so even if you miss the year-2 deadline you can try again.

loves you ♡


Garbage collection request?

Question: As we know that during run time garbage collection request automatically when there is not enough space in memory to forming object. In my knowledge garbage collection call automatically, but when we do some programming in real world then it become indespensible to call garbage collection.let a example if we are making a programm in first step i want to call garbage collection for optimizing memory for further creation of object that means during run time. So how we will call garbage collector ?
Answer: Generally you should not call GC.Collect yourself. The GC is self-tuning and will most likely do a much better job than you can as it can take account of the entire managed heap and its usage.
However, you may want to check the answers to this question as well.
Answer: GC.Collect()

Be aware though!
Generally .NET does a good job of managing the memory for you, and this should be used with care! IMO
Answer: GC.Collect().
You really should not ever have to do this. As long as you properly dispose of your objects you really have no need to invoke the GC. Also remember on any IDisposable object that you do not need to maintain a lifetime for, the using statement is your friend.
Answer:
but when we do some programming in
  real world then it become
  indespensible to call garbage
  collection.

This is not true.
The .NET garbage collector does a very good job determining when it should run, what to free etc., it is adopted to a wide range of real-world scenarios and performs very well in those.
For emphasis, let me phrase this quite clear, as most of the people posting before me already have: In a typical application, there is not need to ever force the garbage collector to run manually. Forcing the GC to run will usually hinder performance, not improve it.
Answer: You can force the garbage collector to collect by calling GC.Collect(), but I highly recommend against it.
Have a read of this question and answer: GC.Collect()

Garbage collection request?


High skin melanoma incidence in Australia and New Zeland

Question: Can somebody explain me if there is any known reason for the high prevalence of the skin melanoma in Queensland and Newzeland?
Comment: Welcome @Luis!  I like the question, could you include a link to resource showing that it is the case so people looking to answer can look at the data?
Answer: One of the causes of melanoma is exposure to UV radiation [1], and Australia is a sunny place!
This reference is also helpful:
"Australia has one of the highest skin cancer incidence and mortality rates in the world. The reason for these high rates is due in part to the high ambient solar UV levels, combined with a predominately susceptible fair skinned population. With a population of just over 20 million, over 1700 Australians die from skin cancer each year. At least two in three Australians will be diagnosed with skin cancer before the age of 70 and over 400 000 Australians are treated for skin cancer each year." [2]
Sinclair, C.; Foley, P. "Skin cancer prevention in Australia". British Journal of Dermatology. 161: 116–123 (2009)


How long does it take to write a script

Question: I am doing a project in my summer holidays, where I want to produce 2 - 3 youtube clips where people should learn something.
I need volunteers for this, writing the scripts, searching the content, etc. and some for doing the design stuff. The video should be in the style of "In a nutshell", so I'm producing it with the help of Illustrator and AfterEffects.
My question is, how much time is needed to write a script for a 3 minute video, when 2 people work together. In best case, the volunteers writing the script know something about that topic already and don't have to do that much research.
The other question is, how long does it take to make all the graphics and design the video itself, when 3 people are working togehter.
I need to know that in order to find out how much money I should give them. Although it's voluntary, I want to give them something and I really don't know how much I should give them.
PS: I have 1000 € for the whole production and about 10 people should help me.
Answer: You are thinking about this the wrong way.  First, you already have an established budget and the number of people you want as collaborators.  You can say "I am looking to work with 10 people to write 2-3 minute scripted educational videos.  You pick the topic and send me a super-rough outline.  If I like it, you write the script, and I'll produce the video content using Adobe Illustrator and After Effects.  In addition to receiving writing credit, I'll pay you 100 € if I accept your script for production."  This way, the process is self-selecting.  Whether it takes them 2-3 minutes or 2-3 days to write the script, you'll get the scripts you want within the budget you have and nobody should be disappointed because all the conditions are stated up-front.

How long does it take to write a script


Why does www DNS record propagate faster than @?

Question: I've recently had to move a DNS ownership from one DigitalOcean account to another. During this process I've noticed that the www A DNS record propagates a lot faster than the @ A DNS record. Why might this be?
Comment: You'll have to ask Digital Ocean. Speculation is off topic here.
Comment: @RonTrunk Are you sure it's a DigitalOcean phenomenon and not a more general phenomenon?
Comment: Unfortunately, questions about protocols above OSI layer-4 are off-topic here.
Comment: @RonMaupin What's the correct place for such questions?
Comment: For your business network, it is [sf], otherwise it is [su].
Answer: You have to take into account the TTL for a record and understand that when it comes to propagation, timing is everything.  For example, if your TTL is 1 hour, and a DNS server refreshes its copy of your record 1 minute before you changed the record, you now have to wait 1 hour (roughly) for that server to get the new record info.  But, let's say the server checked for updates 59 minutes before you changed the record, now it's only going to take 1 minute for the new record to show.  That being said, that's likely all it was - just the timing of when the existing copies of the records expired upstream. It's also a sort of domino effect/chain reaction.  If server C gets its records from server B, and server B gets its records from server A, and server B just got it's update 1 minute before the change, and server C got its update 30 minutes after that, you now have to wait about 1.5 hours for server C to get the updated info.
In general, when changing records and wanting the least amount of propagation wait, I change the TTLs as low as it'll allow for about 3 days in advance to let that propagate, then I'll change the record addresses and TTL back to what I wanted originally, knowing it'll take much less time to get the new info propagated.


Does MITM refer to what you do in the middle or how you get there?

Question: Does the term "MITM attack" refer to what happens once an attacker is between two hosts or to attacks like ARP poisoning, DHCP snooping that allow the attacker to insert himself between two hosts in the first place?
Answer: A MiTM attack refers to the high level concept of intercepting traffic from host A, reading it, and/or modifying it, and then sending it to the original destination B, as if A sent it.
The techniques to accomplish this are an entirely different matter.  It might entail ARP poisoning, physically tapping a line, DNS attacks, sniffing wireless traffic, or even secretly stealing a briefcase of secret documents carried by a courier.
Comment: Thanks Steve. If I understand correctly, what's called a MiTM attack is the situation where an attacker is able to read/modify between two hosts. Techniques like ARP poisoning, dhcp snooping or icmp redirect lead to a MiTM attack?
Comment: @yusuf Yes.  The other things you describe are technology specific ways that a MiTM attack can occur.
Answer: MITM (Man in the Middle) is a specific attack aimed at communications that is meant to be exclusively between multiple parties.  The other references you mention - ARP poisoning and DHCP snooping - are their own attacks and wouldn't qualify as MITM since they aren't reading communications exclusive to select parties.


effect of atmospheric pressure on reading of a weighing scale

Question: Let us consider a completely sealed weighing scale such that the air pressure above and below the pan of the scale are equal and is equal to 1 atm. pressure. The scale initially reads zero. Now if this weighing scale is placed in a completely evacuated chamber, will there be any change in the reading? I am guessing that as the force due to atmospheric pressure above the pan of the scale is now absent, but the air pressure below the pan is still present, the scale will show a negative reading as it experiences a net upward force which is equal in magnitude to the force exerted by the atmosphere on the pan initially. Is this reasoning correct? If not, what is the actual answer?
Comment: If it is placed in a completely evacuated chamber, air-pressure from all sides will be 0. Why do you say air pressure will be present below the pan?
Comment: And if the pressure on all sides are still the same in a near vacuum than the masses you weigh will be slightly heavier, since before they where experiencing a small buoyancy force.
Comment: @michailcazi the weighing scale is completely sealed so whatever air was present inside it(ie. between the pan and the body of the machine) is still present in it though the instrument is in vacuum.
Answer: You must consider the effect of air pressure on each side of the pan when reading the weight, because the scale measures the exerted force, and this force can be exerted from the air pressure as well as any other object on the scale.
So, if the pressure below the pan is 1atm more than the pressure above, your explanation is correct and there will be a negative number.
Answer: Yes, what you have is called a "barometer".
Answer: Moving the scales from air to vacuum you would expect the reading to move in the same direction as if you had moved it from water (with 1 atm of air pushing down on the water) to air. The specific direction in either case would depend on whether the weighing mechanism relied on a sealed, compressible cavity.
A weighing mechanism based on the length displacement of suspending spring would give decreasing readings as the density of the fluid increased, due to buoyancy on the pan.
A weighing mechanism based on the volume displacement of a sealed cavity (piston compressing air chamber, calculating the force via gas laws) would give increasing readings as the pressure of the fluid increased. The pressure is important here depending on how vacuum is defined, as you can introduce heat energy to a partial vacuum and increase its pressure, even though there is no more gas and no less volume than there was before.


What is interface in magento 2 and why use?

Question: What is interface in Magento2 ? Why use this ? I want to know more detail about interface ?
Answer: Main use of Interface is :

A public interface is a set of code that third-party developers can
call, implement, or build as a plug-in. Magento guarantees that this
code will not change in subsequent releases without a major version
change.

You can read the detail information here :
https://devdocs.magento.com/guides/v2.4/extension-dev-guide/api-concepts.html
Comment: Thank you Dhiren Vasoya
Comment: If answer help, upvote and accept as solution, so it will help other into community.


What is the name of the Instrument that indicates roll?

Question: What is the name of the instrument that would indicate whether the wings are level or tilted (one higher than the other) as when flying IFR? Is it the inclinometer?
Answer: The only1 instrument that directly indicates the bank angle is the attitude indicator, also (especially formerly) known as the "artificial horizon".  As another answer has noted, many other instruments give indirect indications of bank angle, and by using them appropriately, it is quite possible to keep the wings level even with no direct indication of the bank angle.
The magnetic compass (even of the simple "wet" type) could be added to the list of instruments that indirectly indicate bank angle, though its use is very limited.  (For example, at mid-latitudes in the north magnetic hemisphere, it is generally not feasible to rely solely on a magnetic compass for bank attitude control, even in very smooth air, on headings that lack a significant southerly magnetic component.)2  It would be very challenging to use a magnetic compass to keep the wings level in any significant amount of turbulence, even if the pilot were free to choose a target heading that gave optimal perfomance of the compass.
The inclinometer doubles as a bank angle gauge if the aircraft is kept on a linear flight path.  Since any deviation from wings-level flight generally causes the flight path to curve, the inclinometer is of no practical value for keeping the wings level in clouds.
Beware of the term "turn and bank indicator".  This is another name for the needle-and-ball turn rate indicator, or its vintage British equivalent that has a second pointer arm in place of the ball.  But the ball-- also known as the "inclinometer"-- or the second pointer arm-- really just indicates sideslip, not bank angle.  As noted above, only if the flight path is constrained to be linear does the inclinometer reading correlate to the bank angle, and that is not a realistic constraint for most cloud-flying situations.  A better name for this instrument is "turn and slip indicator".  A more common name in modern times for this instrument is simply "turn rate indicator", with the fact that a slip-skid ball (inclinometer) is mounted in the same housing going unmentioned.
Footnotes:
1-- Here's a notable, but rarely-seen, exception to this statement-- the "Bohli" compass is a specialized compass for use in gliders.  One of its many advantages over a more conventional magnetic compass is that it provides some direct indication of bank angle.  See these related ASE answers for more about it-- How can pilots fly inside a cloud? , Is it normal for gliders not to have attitude indicators?
2-- Same as footnote 1!
Answer: Many instruments can indicate roll. Here is a list in order of Primacy according to the Primary-Secondary Method of Instrument Flying:

Heading Indicator
Attitude Indicator
Turn Coordinator
Rate of Turn Indicator (when TC is absent)
Inclinometer (actually only measures coordination)

In the Control-Performance Method of Instrument Flying, and what most pilots use for real world flying, the Attitude Indicator is used to measure bank angle. Caution should be used at extreme pitch and bank angles. A gyroscopic AI can tumble at angles past 60°, making it unreliable past that.
Comment: I would not deduct bank angle from heading indicator alone. It tells you whether your heading is changing or not, but it is not necessarily doing so due to bank angle. You can also fly dead straight with 90 degree bank angle ;)
Comment: Hi, thanks so much for your answers. I am writing up an incident that occurred in 1969 involving a Beechcraft D-18 originally owned by the Royal Candadian Air Force and probably not changed much if at all since it was built. The instrument I want to name gave a direct, visual indication of the plane's wings relative to level, so based on your answers I believe it was An Attitude Indicator. Do you happen to know whether it would have been called an Attitude Indicator in 1969? Or an "artificial horizon"?
Glenn
Comment: @Glenn - Hey, Glenn. You will need to find a POH, AFM, or owners manual to get the exact nomenclature for that make, model, and year. Take into consideration that the avionics might have been changed out since it's build date.
Comment: Thanks. I think for my purposes "Attitude Indicator" will do.


Software for storing information of large number of atomic structures into database file

Question: Say I have a MD trajectory that contains a million snapshots (i.e. a million atomic structures). Each snapshot contains some calculated information (either by DFT or some force field) such as energy, forces and potentially other properties. What software can efficiently store these atomic structures into a database file without losing any relevant information? Ideally, one should always be able to reproduce each atomic structure from the database. I'm particularly interested in database programs that can handle huge amount of structural data without taking too much memory space.
Comment: +1 but you'll likely be limited by the size of the data itself, which has nothing to do with the sofrware.
Comment: Why not write the frames into any standard compressed trajectory format (like XTC or DCD), and then the per-frame information as a comma- or space-separated values file in plain text?
Comment: MDAnalysis can iterate over trajectory files loading one frame into memory at a time (I'm sure other Python MD packages do too), and you can cache previous searches as a list of frames together with metadata to identify the search.
Answer: One of the more recent options for the xyz file format is bqbtool by Martin Brehm, which significantly compresses the trajectory files by factor of 20~30 using a lossless compression scheme. One of the main advantages of this compression scheme is that one can use the associated code travis to calculate basic properties such as radial and spatial distribution, structure factor, correlation functions,vibrational spectra and much more directly from the converted bqb file.
You can read more about bqbtool at https://brehm-research.de/bqb.php


Replacement for 'https://live.azure.com/'?

Question: I am trying to set up the customer and partner portals for CRM 2011 and am having a really hard time. I followed the documentation for the portals (the ones from pinpoint, default portals that come with the Contoso domain) but when I get to the part asking me to register my application I just don't know what to do...
In the documentation it says go to https://live.azure.com/ and register the application but this site does not exist anymore or at least I can't seem to get to it (tried to google it but I can't come accross anytihng that will allow m to register an application). Is there a new site where you register the application? Someone please help me because this is really annoying me and its pretty stupid that Microsoft does not update its documentation at all.
Thanks for any help! :)
Details about my setup: We (net admin and I) set up CRM 2011 in a test environment in the office and have Exchange and CRM 2011 sitting on two environments. I can communicate through Exchange and emails from CRM but I can't figure out how to allow users access to this Customer portal and Partner portal. This is all using the Contoso domain and sample data.
Comment: Anyone??? I can't seem to get any user access to the portal...
Answer: I met the same issue and answer to this thread helps me. Moreover, check next article - Getting Your Client ID for Web Authentication, for some extra info.
You can go to the Windows Live application management site via this link.


Dashcam application that saves GPS tracks alongside of video

Question: I am looking for a free dashcam application that I can extract GPS tracks from the saved videos (possibly using FFprobe).
Answer: To extract GPS information from video you can use exiftool. If you want plaintext format you can use command:
exiftool -ee video.mp4 >output.txt

if you want to have GPX format as output you can use command:
exiftool -p gpx.fmt -ee video.mp4 >output.gpx

where gpx.fmt file can be downloaded from here. You will need exiftool version 10.49 or later.
Comment: Thanks, I already tested two dashcam applications and found that the video they created doesn't have GPS tracks embedded.  Do you know any free dashcam application for Android that I can use to capture data which later I can use the above tool to extract
Comment: @mans, no idea, sorry. IMHO this will be shared in the characteristics of app


Launch Windows Phone 8 Emulator programmatically

Question: How to launch Windows Phone 8 Emulator programmatically from a desktop app?
Answer: You may use the Microsoft.SmartDevice.Connectivity API to launch the Windows Phone 8 Emulator from your program code.
For further information, please see the Microsoft MSDN article: Controlling Devices with the Smart Device Connectivity API
Answer: You can find your Emulator launcher in C:\Program Files (x86)\Microsoft XDE\8.0 but the real problem isnt finding the program or even launching it pragmatically. The problem is that I think it needs a XAP file or it will not launch. If you can find a way to launch it however I think the easiest way would be from a .bat file
Open notepad
-type in cd
Go to next line
-type executable name
Save as "fileName.bat"
MAKE SURE TO INCLUDE THE QUOTATIONS WHEN YOU SAVE or it will save it as a text file and not a batch
Double click it
Answer: Another way of launching the Emulator is From the Start Panel --> Hyper-V Virtual Machine a box will pop up with the list of Virtual Machines on your computer choose the Windows Phone Virtual Machine you have on your computer and click on OK your Windows Phone emulator will launch.


Is it impossible for anything to touch anything else because of Planck lengths?

Question: Suppose you touch a cube. There would still be a Plank length between your hand and the cube. Does this mean that it is impossible for anything to touch anything, specifically because there is always an infinitesimal distance between two objects? I don't think this would work (since there can be no distance smaller than a Plank length and that if you are a Plank length apart, you are "touching" something, but I want to make sure that this idea is void before I discard it).
Comment: You said "There would still be a Plank length between your hand and the cube." There is no theoretical or experimental support for this claim.
Comment: Possible duplicates: https://physics.stackexchange.com/q/23797/2451 , https://physics.stackexchange.com/q/1077/2451 and links therein.
Comment: This is not a theory.  So there is nothing to scrap.
Comment: It's just not clear how you come to that conclusion. Perhaps edit your question to clarify.
Comment: It is not scientific. It has no basis in either experiment or any experimentally confirmed theory. I doubt it is even supported by a purely speculative published theory.
Answer: The reason your hand doesn't quite touch the cube is that the electrons around the atoms in your hand are repelling the electrons around the atoms in the cube. Specifically, photons exchanged between those electrons mediate the electromagnetic repulsion. The actual distance depends a lot on how hard you press, and even if you press really really hard, the closest you can get is many orders of magnitude larger than a Planck length.
So it's true that nothing touches anything else, but it's usually for a different reason. Except maybe in extremes like atomic nuclei and neutron stars where fermions are crowded right next to each other and Pauli exclusion effects start to become the reason. But those particles are themselves much larger (like $10^{20}$ times) than the Planck length, so it's even then hard to define what it means to say they're touching.
Comment: So what would you expect "touching" to mean? In practice,  when the atoms are close enough to feel the repulsion it's touching.
Comment: Sure, maybe two things are "touching" when the repulsive electromagnetic force equals the force moving them together, so they stop getting closer. Or maybe it means there's no space in between them (so it never happens)? I don't know, it's a poorly defined term microscopically but we use it all the time macroscopically.


Transparent Strip Around Border Of Render Preview

Question:
Whenver I try to preview the render, using the Ctrl+B render box I get these strange transparent strips
I haven't tried rendering the whole model yet (as it isn't finished) but I hope they won't affect it?
They popped up seemingly without any cause and occur no matter what I box select.
Anyone know what to do?
Comment: I'd suspect it has something to do with the camera, but I'm not sure. I've never seen this specifically before.
Answer: When you did ctl + b and drew the box to render you only selected that part that you see rendered. There is more to the scene but you would need to redraw your box (ctrl + B) around the whole box outlined in red (the render view).
To recap:
Just ctrl + b around the entire red square and you should be fine.
The ctrl + b is just for rendering a certain part of your scene so you do have to waste time rendering everything.


based on each car animation

Question: I'm finding it difficult to achieve car
Comment: Hello and welcome. While files, images, and external videos or links may be helpful additions they should not be the only way to obtain information about your issue. Don't make understanding your question rely on downloading a file, watching a video or visiting an external site. Use the builtin tools to upload [images](https://meta.stackexchange.com/questions/75491) or [gifs](https://blender.meta.stackexchange.com/questions/963), along with thoroughly explaining the problem in written form so it can be indexed and searched for thus helping future visitors with similar issues.
Answer: You could unwrap your object so that the faces do a straight UV (here I've used Follow Active Quads):

Give it this node setup with a Gradient plugged into a ColorRamp and with the Mapping location value set to a value that makes it black:

Keyframe the Mapping location so that the light moves forward:

based on each car animation


Oracle server requirements calculation

Question: Is there a standard methodology for determining how much CPU, memory and disk space is needed to support an Oracle database with 500 million rows of sensor data (and counting) ? The system in question is a SCADA database gathering sensor data from hundreds of field devices on a daily basis. The same database is used for reporting and analysis (a watershed and wastewater management system for a major municipality).
Comment: It's more art than science. Oracle provides tools such as Database Replay that make it easier, but it still requires deploying a system and running a load test to see how it performs.
Answer: You can roughly calculate current disk space requirements by using guidelines from the Oracle documentation, once you have defined your schema, including the necessary indexes and materialized views, if any. Do not forget to add space for backups and archived logs.
As for the CPU and memory requirements, they would mostly depend on the exact characteristics of your workload, given the schema defined earlier. In this day and age you should be able to spin up a virtual server with one of the cloud providers and run your load tests (you do have a load test suite, right?) against it much faster than trying to find some magical generic formula on the internets.
Answer: Hundreds of devices daily is trivial. Oracle can handle hundreds of transactions per second, depending on the number of CPUs and the size of the instance (memory). In other words, CPU and memory is needed for handling high concurrency.
500 million rows can easily be calculated by various methods, and extrapolated for future growth. I would worry more about concurrent access to your storage, rather than size of storage. So you would need to invest in NAS at the very least, and have a storage array connected to oracle running in a preferably unix or linux environment (due to the scaling that you mentioned).
Oracle can very easily handle billions of rows per table.  I know, because we have one 20 billion row table in our warehouse.
Also make sure you have an archive strategy in place, and before your tables grow too large, make sure they are partitioned!

Oracle server requirements calculation


Zeroing all Sorted Set Scores

Question: I'm using Redis to store a set of checksums. I'm incrementing each member that I see while parsing a large dataset, and using the score to determine which I've "visited" more than once. However, as this operation is done periodically, I would like to reset the scores of all members to zero afterward. Is there a good way of doing this?
I am aware of ZRANGEBYSCORE, and perhaps could "copy" what it returns into a new key, however with a large set of data, this is less desirable. I could also take the minimum score at the start of the process and ZREMRANGEBYSCORE everything at or below that score, but this too seems undesirable as my scores would continue to rise indefinitely.
Comment: can you just delete the key that contains the ordered set and continue using this key?
Answer: You could use ZUNIONSTORE with a WEIGHTS value of zero to copy the set and zero all scores, e.g.
ZUNIONSTORE myZeroedSet 1 myInitialSet WEIGHTS 0
RENAME myZeroedSet myInitialSet

A weight of zero will cause all scores in myInitialSet to be multiplied by zero, thus resetting them. The RENAME will succeed without you having to explicitly delete myInitialSet first.
The advantage of this is that it happens inside Redis (you don't have to transfer the entire set over the network and back), and it's fast.
Comment: This answer works well. I think though you can avoid the rename by just using the same set name.

    `ZUNIONSTORE myInitialSet 1 myInitialSet WEIGHTS 0`
Answer: The best and quickest way to do that is using a simple LUA script :
eval "local z=redis.call('ZRANGE', KEYS[1], 0, -1) for i=1, #z, 1 do redis.call('ZADD', KEYS[1], 0, z[i]) end" 1 myInitialSet

It's atomic and everything happens inside Redis too.

Zeroing all Sorted Set Scores


Symmetry axis and products of inertia

Question: So if we have an object that has a symmetry axis let us say $z$-axis is a symmetry axis does this mean that the product of inertia $I_{zx} = I_{zy} = 0$? And if that is true why is it true mathematically speaking?
Comment: Do you mean moments of inertia? No, they will not be zero, not even for a symmetric object. Look at the definition $I=\int \rho (r) r^2dV$. Because physical densities are always positive the integral can only be zero if $\rho (r)=0$ $\forall r>0$, which is physically impossible.
Answer: Yes, you are right.
Indeed, since $z$ is a rotational symmetry axis, it defines  an eigenspace of the inertial operator $I$. Since $I$ is a symmetric linear operator, it admits an orthonormal basis of eigenvectors, one such vector is ${\bf e}_z$. This unit vector can be completed into a basis of eigenvectors just adding some pair of unit orthogonal vectors. However, in view of the axial symmetry around $z$,  each pair of mutually orthogonal vectors which are also orthogonal to ${\bf e}_z$ must define such a basis.
We conclude that a basis of eigenvectors of $I$ is ${\bf e}_x, {\bf e}_y, {\bf e}_z$.
Writing $I$ with respect to that basis, it gives rise to a diagonal matrix. Consequently $I_{ij}=0$ if $i\neq j$. This happens, in particular, for $i=z$ and $j=x,y$.

Symmetry axis and products of inertia


Bulk Download of Public Domain Images

Question: Is anyone aware of a site that offers bulk download of public domain images? I'm working on an image processing machine learning project, and I need a ton of photos to train and test my algorithm with. I've found several sites offering free public domain images, but they're all simple webpages, requiring you to navigate to each image in order to download it. I could potential write a script to crawl and download all images, but I'm hoping someone knows of a similar resource that simply has images available via an FTP share, ZIP archive, etc.
Comment: http://en.wikipedia.org/wiki/Wikipedia:Public_domain_image_resources
Comment: How is accessing photographic archives off topic of photography?
Comment: This is off-topic here — it's more a web question than a photography (or photographer) question. I took a look at http://www.archive.org/, but while they have a _moving images_ archive, still images seem to be left out. (Also, do you need _public domain_, or is CC-licensed okay?)
Comment: Yes, CC-licensed would be ok. I'm not making any money off of this project, so any resource that's free would probably work.
Comment: How important is the size of the images?
Answer: You can use wget to easily retrieve images from any web page or recursively from a hierarchy of web pages. So you need not restrict yourself to FTP sites, although wget works fine with FTP sites as well.
See the wget manual.
This page describes how you can filter by any type of file you wish to download.
You will in all probability get a few extra graphics files used for page decoration that you will have to manually screen out.
On a more general note, if you only use the images for training your system and don't publish, re-distribute or create derivative works then you can use pretty well any image on the Internet under the fair use interpretation of copyright law. Merely viewing the image already creates a copy on your hard disk. Now this note is sure to incite a few dissenting voices and we will have an interesting debate. Use your own judgment.
Answer: Even if you found a source, how'd you ascertain that the images are indeed free to download?
I've found a lot of sites offering icon collections for download for software development for example that claim to be public domain but I had to discard them all because the actual icon collections contained a lot of icons stolen from existing applications (or containing trademarked images).
I'd expect any collection of "free" images to be no different.
At best you can try to contact some photographers through their websites and ask for permission to use some of their imagery for your test.
Comment: For most public domain image collections I've seen, the images are of fairly poor quality, or are of subject matter over a hundred years old, and therefore obviously public domain. In any case, it's for personal research purposes, so I'm not terribly concerned.
Comment: Also, many of the resources are hosted by the U.S. federal government, or other non-profit institutions. It's unlikely they've stolen their images.

Bulk Download of Public Domain Images


Prince of Yerushalaim named Merishadek?

Question: My auto mechanic is an Eastern European Jew whose father was a Charedi student in Romania (the man himself is not a very observant Jew at all, judging by appearance and mannerism), and frequently lectures me on the prophets and their writings. He often speaks of a Prince of Yerushalaim named Merishadek (that is what I decipher through his accent), but upon a quick flip through some books on scripture and a few Google searches, I cannot find any man by this name. Who is he?
Comment: What does your mechanic say about this Merishadek?
Comment: Something about hating Muslims. I usually tune him out because he is so vehemently anti Islam
Comment: @ElyBeauEastman, kol hakavod on ignoring his vehemence, however what does Malchitzedek have to do with Islamophobia?
Answer: This could be Malchitzedek, traditionally identified as Shem, son of Noah. He was a priest and the ruler of Yerushalayim* in the time of Avraham Avinu, although it was then known as Shalem (see Parshat Lech-Lecha and commentary ad loc.).

Prince of Yerushalaim named Merishadek?


How to save/load objects in a game

Question: I was wondering what is the best way to save and load a game in progess in XNA on a PC game? I given some thought and wrote some code but I feel my methods are weak and I can do it in a better way. My method was to have a ToString() method for each game object. Then I would write that to a file and convert it to bytes(to discourage tampering) and saved the file. Then when load time came it convert the bytes back to strings and I would read each one a re instantiate those objects in a new game. So any suggestions? Or is my method a good way of doing this?
Answer: Have you looked into serialization? It converts the object directly to bytes and then converts the file directly into an object again.
Here is a MSoft link on how to do it.
It's faster and cheaper (for CPU) then converting to a string then parsing. There may still be better ways though. Those would require quite a bit more work then Serialization, which is very simple.
Answer: Take a look at http://easystorage.codeplex.com/ it handles most of the headache when it comes to this kind of stuff.
Also if you ever plan on porting this to Windows Phone or Xbox, it is supported.

How to save/load objects in a game


Can monsters/bandits spawn in my house?

Question: I've just built my very first house (Heartfire DLC). I went downstairs and I had to fight 5 skeevers.
Will they respawn? Can bandits vandalise my house/stables/etc.? Can a follower stay there forever and take care of those circumstances?
Answer: I never had mobs spawn in my house, but I regularly had thieves, giants and other nuisances right outside of my home.
And neither my housecarl nor anyone else took care of them. My assumption is that they do not spawn unless you are there.
The skeevers are an exception to appear as a house pest in the cellar. You wive might alert you that she heard something. You can also keep one of them as a pet if you have kids.
Comment: @user26147 "*Don't they know skeevers are not dogs?*" Tell that to [Arvena Thelas](http://www.uesp.net/wiki/Oblivion:Arvena_Thelas).
Comment: Yep. Mob spawning location isn't random; it's controlled by mob spawner nodes built into the landscape and buildings. (And yes, they only activate when the player is nearby.) There are none inside the house apart from the skeever one, so you'll never have bandits chewing your cellar barrels looking for grain, only rats.
Comment: Really?! Kids playing with skeevers? Don't they know skeevers are not dogs?
Comment: I am frequently entertained by having bandits spawn inside the structure of my house when I fast travel to it.  I hear them yelling.  I walk around the house & the little red dots on my compass are always inside it.  I frequently need to step into & back out of my house to free them from their house shaped prison...
Answer: In fact, bandits have spawned inside my house. And giants, wolves and bandits outside. I don't know if it's a glitch or something, but the answer to the question is a solid YES.
Answer: I Believe monsters can't spawn inside your house, Unless they are skeevers, but bandits and such can, As in they can raid your things or attack you.
I have had it happen to me before but I believe it is very rare.

Can monsters/bandits spawn in my house?


Voronoi Polygon Coordinates

Question: I am using Voronoi polygon coordinates and respective node coordinates together. To apply the load to that particular node which is obtained by summing up the loads that lies within the polygon. By exporting geometry property I am getting nodal and polygon coordinates in separate files. Can I able to get those files together? Or else the polygon coordinates for one shape id within one row?
[
Comment: I'm not entirely sure what you are trying to achieve. You have a (point?) layer from which you have generated voronoi polygons. I am assuming you must also have another (point?) layer and you wish to sum attributes ("load"?) of this layer, by polygons in the voronoi polygon layer. Is this correct? Also, it is not possible to answer the question without knowing the software that are you using.
Comment: Reading again another interpretation might be that you have generated Voronoi polygons, extracted the nodes of this layer and now wish to sum an attribute ("load"?) of these nodes, by voronoi polygon. In which case, each node will belong to more than one polygon. Where did the attribute "load" come from?
Comment: I have several nodes. For example 50 nodes. For each nodes i have drawn voronoi polygon. from MMQGIS > the geometry export option, the shape id and respective polygon coordinates are exported to CSV file as attached in image 2.I am using matlab coding to get the final result.In that I need to get the coordinates for each point in the following attachment 1. Is that possible to get in this order
Comment: Please don't forget to accept the answer if it answered your question. If not, please add some more detail so we can give you a better answer.
Answer: You need to make sure that the polygons have an id attribute.
Then vector -> Geometry Tools --> Extract Nodes. This will give you a point file with the attributes of the source polygons for each node. Then save the layer as a CSV. This will give a table with the attributes (including your id) and x, y values.

Voronoi Polygon Coordinates


What is the difference between Bhakti and Parabhakti?

Question: What is Parabhakti? I heard this term for the first time. What is the difference between Bhakti and Parabhakti? Are there any other types of Bhakti? How many types of Bhakti are there?
Comment: This answer (https://hinduism.stackexchange.com/a/38329) discusses about various types of Bhakti including Para Bhakti.
Answer: In The Devi Bhagavatam, Devi Parvati gives the  Definition of Para Bhakti.

11-20. Now hear attentively about the Parā Bhakti that I am now
describing to you. He who hears always My Glories and recites My Name
and whose mind dwells always, like the incessant flow of oil, in Me
Who is the receptacle of all auspicious qualities and Guṇas. But he
has not the least trace of any desire to get the fruits of his Karma;
yea he does not want Sāmīpya, Sārṣṭi, Sāyujya, and Sālokya and other
forms of liberations! He becomes filled with devotion for Me alone,
worships Me only; knows nothing higher than to serve Me and he does
not want final liberation even. He does not like to forsake this idea
of Sevya (to he served) and Sevaka (servant who serves). He always
meditates on Me with constant vigilance and actuated by a feeling of
Supreme Devotion; he does not think himself separate from Me but
rather thinks himself "that I am the Bhagavatī." He considers all
the Jīvas as Myself and loves Me as he loves himself. He does not make
any difference between the Jīvas and myself as he finds the same
Caitanya everywhere and mainfested in all. He does not quarrel with
anybody as he has abandoned all ideas about separateness; he bows
down, and worships the Cāndālas and all the Jīvas. He who becomes
filled with devotion to Me whenever he sees My place, My devotees, and
hears the Sāstras, describing My deeds, and whenever he meditates on
My Mantras, he becomes filled with the highest love and his hairs
stand on their ends out of love to Me and tears of love flow
incessantly from both his eyes; he recites My name and My deeds in a
voice, choked with feelings of love for Me.

Such Is the Nature of Para Bhakti, Where the Devotee simply sees nothing other than his/her Ishta and Realizes their Ishta as their own self only. As a result their ego is completely dissolved and Their Bhakti culminates into the Realisation of Soham-asmi.

21-30. O Lord of the mountains! He worships Me with intense feeling as
the Mother of this Universe and the Cause of all causes. He performs
the daily and occasional duties and all My vows and sacrifices without
showing any miserly feeling in his expenditure of money. He naturally
longs to perform My festivities and to visit places where My Utsabs
are held. He sings My name loudly and dances, being intoxicated with
My love, and has no idea of egoism and is devoid of his body-idea,
thinking that the body is not his. He thinks that whatever is
Prārabdha (done in his previoas lives) must come to pass and therefore
does not become agitated as to the preservation of his body and soul.
This sort of Bhakti is called the Parā Bhakti or the Highest Devotion. Here the predominent idea is the idea of the Devī and no
other idea takes its place. O Mountain! He gets immediately dissolved
in My Nature of Consciousness whose heart is really filled with such
Parā Bhakti or All Love. The sages call the limiting stage of this
devotion and dispassion as Jñāna (knowledge). When this Jñāna arises,
Bhakti and dispassion get their ends satisfied. Yea! He goes then to
the Maṇi Dvīpa, when his Ahamkāra does not crop up by his Prārabdba
Karma, though he did not fail to give up his life in devotion. O
Mountain! That man enjoys there all the objects of enjoyments, though
unwilling and at the end of the period, gets the knowledge of My
Consciousness. By that he attains the Final Liberation for ever.
Without this Jñāna, the Final Liberation is impossible.

~ Devi Bhagavatam, Book 7, Chapter 37
As for the Question, Are there other Types Of Bhaktis? Yes, And Devi Describes them in the same section too.

This Bhakti (devotion) again is of three kinds as the Guṇas are
three. His Bhakti is Tāmasī who worships Me, to pain others, being
filled with vanity and jealousy and anger. That Bhakti is Rājāsic,
when one worships Me for one's own welfare and does not intend to do
harm to others. He has got some desire or end in view, some fame or
to attain some objects of enjoyments and ignorantly, and thinking
himself different from Me, worships Me with greatest devotion. Again
that Bhakti is Sāttvikī when anybody worships Me to purify his sins,
and offers to Me the result of all his Karmas, thinking that Jīva and
Īśvara are separate and knowing that this action of his is authorized
in the Vedas and therefore must be observed. This Sāttvikī Bhakti is
different from the Supreme Bhakti as the worshippers think Me
separate; but it leads to the Supreme Bhakti.

Similarly, This how Narada Purana describes the highest Bhakta-

अहमेव परो विष्णुर्मयिसर्वमिदं जगत्। इति यः सततं पश्येत्तं
विद्यादुत्तमोत्तमम्॥ १५-१५०॥
If one perceives that 'I'm the परः विष्णुः (Supreme Vishnu), all the jagat exist within
me'; always know to him (who perceives thus) as the उत्तमोत्तमः।

~ Narada Purana I.15.150
Answer:
How many types of Bhakti are there?

Skanda Purana Mentions Three Types of Visnu Bhakti - Sattvika, Rajasika and Tamasika.

Listen to it attentively, O king. Listen to the eternal Bhakti in
general and Bhakti to Viṣṇu in particular.

'He (Viṣṇu) alone is the giver of absolute happiness and the
breaker of the series of miseries.' If any one thinks thus and resorts
to him (the Lord), it is called Bhakti. It is of three types according
to three Guṇas and (that which transcends these Guṇas and is thus)
attributeless (Nirguṇa) is considered to be the fourth one.

83) The devotion of those who are overpowered by lust and anger and who do not see any other means shall be the Bhakti of Tāmasa
variety, O king. It is conducive to the acquisition (of what they
desire) as well as magical powers
84) The devotion that is resorted to for gaining extraordinary fame or overpowering a rival or incidentally for enjoyment in the other
worlds is known as the Bhakti of Rājasa variety.
85-86a) The devotion is of the Sāttvika variety when it is pursued by one who knows the transitoriness of the worldly objects of pleasure
and the comparative permanence of those of the other world and who,
without giving up the (religious) duties prescribed for one's own
caste and stage in life, resorts to devotion only for the sake of
self-realization.
86b-90) 'The Lord of the universe himself (is identical with) this
universe. There is no other cause (of this universe). I am not
different from him. He does not abide separately from me. He is devoid
of external attributes and adjuncts. He should be realized through an
abundance of love.' This form of Bhakti is very difficult to attain.
It is conducive to salvation. It is called Advaita (non-dualistic)
devotion.
Devotees go to the abode of Brahman by means of Sāttvikī Bhakti; to the world of Śakra (heaven) through the Rājasī Bhakti. After
enjoying the pleasures (of the earth) the devotees of the Tāmasī
Bhakti go to the world of Pitṛs. They return to Bhūrloka (Earth) and
adopt a Bhakti other than the previous one. The devotee of Tāmasa
variety adopts devotion of the Rājasa variety; and one of the Rājasa
type adopts the Sāttvika variety. The devotee of Sāttvika type attains
liberation after non-dualistic contemplation.

Skandapurana Book 2 - Vaiṣṇava-khaṇḍa -  Section 2 - Puruṣottama-kṣetra-māhātmya - Chapter 10.
Answer: In Hindu philosophy, Bhakti and Parabhakti are two terms that refer to different aspects of devotion or love towards the divine. Here's a breakdown of their meanings:
Bhakti: Bhakti refers to devotion or love towards a personal deity or a particular form of God. It involves developing a deep emotional and personal connection with the divine through acts of worship, prayer, rituals, and surrender. Bhakti is often characterized by intense feelings of love, devotion, and surrender to the chosen deity. It is considered a path to spiritual realization and liberation.
Bhakti can be practiced in various forms, such as through chanting, singing hymns or bhajans, reading sacred texts, performing puja (ritual worship), and engaging in selfless service to the divine or others.
Parabhakti: Parabhakti, also known as supreme devotion or transcendental devotion, goes beyond the personal aspect of Bhakti. It refers to a state of complete selfless devotion and surrender to the divine, where the individual merges their own identity with that of the divine. It transcends the dualistic perception of the self and the divine and recognizes the inherent unity between the devotee and the divine.
Parabhakti is often described as a state of non-duality, where the devotee realizes their own true nature as an expression of the divine. It is considered the highest form of devotion and leads to the experience of oneness and liberation.
While Bhakti focuses on personal devotion and love towards a particular deity, Parabhakti represents the ultimate realization of the devotee's identity with the divine and the dissolution of the individual ego.
Ref:- Bhagavad Gita: In Chapter 12, Verse 2, Lord Krishna describes the qualities of those who possess supreme devotion (Parabhakti), including being free from malice towards others, friendly and compassionate, free from possessiveness, and having a steady mind. Narada Bhakti Sutra: This text specifically explores the nature of devotion (Bhakti). It outlines different stages of Bhakti, such as Anukulyasya sankalpaḥ (favorable intention towards the divine), Mamatvaḥ (sense of possessiveness towards the divine), and Paripakvataḥ (maturity of devotion
Comment: @AmritenduMukhopadhyay Bhagavad Gita: In Chapter 12, Verse 2, Lord Krishna describes the qualities of those who possess supreme devotion (Parabhakti), including being free from malice towards others, friendly and compassionate, free from possessiveness, and having a steady mind.
Narada Bhakti Sutra: This text specifically explores the nature of devotion (Bhakti). It outlines different stages of Bhakti, such as Anukulyasya sankalpaḥ (favorable intention towards the divine), Mamatvaḥ (sense of possessiveness towards the divine), and Paripakvataḥ (maturity of devotion).
Comment: quora, Wikipedia, and blogs are not valid sources. You have to directly quote from Hindu scriptures on this platform.
Comment: You have to directly quote the verses with verse numbers and English translations. You can't just name the book. You have to find those verses.


Train and test a PLS model with simulated contaminations spectra

Question: The data I have to analyze are as follows. There are three group of samples: the reference samples (REF, 100 samples) and two groups of contaminants (Ca, 100 samples and Cb, 10 samples). I have spectroscopic  data (NMR data) for all the samples and the spectra within each group are very similar but their difference is definitely greater than experimental error. I want to train two PLS models to estimate the contamination of REF with Ca and Cb. I know that the NMR specrum of a contaminated sample is the linear combination of the specrum of the reference sample and of that of the contaminat, so I want to simulate the spectra of contaminated samples and use these simulated spectra to train the PLS model. So, my question is: which is a good set of simulated spectra to train the PLS models for Ca and Cb? Also, consider that I'm mostly interested with contaminations up to 10 %.
For example, should I use one spectrum only to simulate a single contamination or can I use it to simulate many levels of contaminations? I have some concerns that using the same spectrum many times could bias the results of crossvalidation for determining the best number of PLS components.
Comment: I have prepared some real contaminated samples. Comparing their spectra with the simulated ones both visually and on the PCA. My judgement was that the difference is just noise.
Comment: I cannot disclose the nature of samples, but to give an idea I can say that reference and contaminants are of very similar nature, like olive oil or wine from different brands/regions.
Answer:
I know that the NMR specrum of a contaminated sample is the linear combination of the specrum of the reference sample and of that of the contaminat

How do you know that? Can you really exclude the possibility of a new chemical species forming in the contaminated sample? Keep in mind: dealing with such chemical interactions one of the big points for PLS, and the species does not need to be a reaction product or even intermediate molecule, it can be something like surface species, dimers, conformation changes, ...
But PLS can only "learn" this if the spectra actually reflect the possibility of such interactions.
If you per se do not consider the possibility of interactions, you can decompose, say, on a set of PCs for REF plus contaminant spectrum (or a set of PCs of the contaminant if there's some known variability here as well). The PLS won't produce any further information if the training data didn't cover further variation.
At the very least I'd say that you need to validate your model with true contaminated samples. Otherwise you'll be creating a self-fulfilling prophecy which will almost certainly lead to a huge overoptimistic bias.

I have some concerns that using the same spectrum many times could bias the results of crossvalidation for determining the best number of PLS components.

That IMHO isn't the worst problem here as it can quite easily be prevented: when setting up your crossvalidation you can split so that training and testing are independent both reference and contaminant. I.e. you select particular reference and contaminant true spectra for testing, exclude any spectrum from training that either contains the reference in question or the contaminant spectrum in question.
But here's the catch: as you did not give any chemical justification why the linear combination of reference and contaminant spectra is more than the usual 1st approximation to the situation. So already before calculating the PLS we can say that you cannot possibly know whether your latent variables will be a suitable representation of the possibly more complex reality. It doesn't make sense to speak about findig the optimal number of latent variables in this case. Plus, the scheme you propose for producing the data means that we already know you will need at most one more latent variable than the number of principal components to describe REF. And here again, without knowing the lowest level of contaminant that is important to recognize, it is impossible to judge whether fewer components to describe REF would be sufficient. (Both for us and for your latent-variables optimization)

spectra within each group are very similar but their difference is definitely greater than experimental error

Without knowing far more in detail about your actual application/question it is impossible to say whether you can conclude anything useful from this.
You didn't even tell us what the contaminant spectra represent, e.g.: are they pure component spectra of 100 contaminants? Are they 100 spectra of contaminants isolated from real samples (with contamination)? Are they 100 spectra of contaminated samples? If so, are they representative for certain types of contamination that can occur/how were they selected?
Comment: Tanks for your very informative answer. Could you please add more detail on the PCA approach you suggested? If I do the PCA of the the REF spectra and the Ca or Cb spectra I see that the two groups are separated in PC1, but the dispersion of each group in PC1 is on the order of 10% of the separation between the groups. I was hoping that the PLS could deal with this by somehow forcing all the REFs to 0% and all the contaminants to 100%. I will check this by comparing the performance of the PCA and PLS models on real contaminated sample with known amount of contaminants.
Comment: The PCA solution that came to my mind would be something similar to SIMCA (soft independent modeling of class analogis) of the REF class plus some additional information retrieval for the known contaminants - for contaminant a another class in the SIMCA may be feasible, but for contaminant b with only 10 spectra available you may have to revert to something more basic (e.g. spectra of the relevant species b (or also a) forms in REF).
Comment: "was hoping that the PLS could deal with this by somehow forcing all the REFs to 0% and all the contaminants to 100%": you can set up PLS to do this, yes. Whether it is sensible depends entirely on your particular situation. For food contamination scenarios such as you hint at it often is *not sensible* - but I cannot tell you more than these very general caveats without detail information. (Just in case: I'm not here to advertise, but I do offer chemometric consulting as professional service and then of course NDA or similar contractual agreements are avialable - so do other people)
Comment: Thanks. Maybe I will compare PLS with PCR. I will accept you answer as it explains how to do crossvalidation, which was my main concern.


Normal subgroups of a group of order 12

Question: Let $G$ be a group of order 12 and suppose $G$ does not have normal subgroups of order $4$. How to show that $G$ has a subgroup of order $6$?
Comment: Do you have the Sylow theorems available to you?
Answer: By Sylow's Theorem, the number of Sylow 2-subgroups $n_2 = |G:N_G(P)| \equiv 1 \pmod 2$ where $P$ is any Sylow 2-subgroup of G and NG denotes the normalizer. Since $P$ cannot be normal in $G$, $|G:N_G(P)|\neq 1$ and must be $3$ (the only other odd divisor of $12$). Assuming the Sylow 3-subgroup is not normal either, results to a number of $4$ subgroups of order $4$ by the same argument. This would add up to one neutral element, 8 elements of order $3$, $3$ elements of one Sylow 2-subgroup and at least another element for another Sylow 2-subgroup,totaling at least 13 group elements of $G$.
Hence $G$ has a normal subgroup $N$ of order $3$. $G$ also has a subgroup $H$ of order $2$ contributed to Cauchy (also part of Sylow's Theorem). Now since $N$ is normal in $G$ and $N\cap H = 1$, we have a semidirect product $NH \le G$ of order $6$.
Added after Steve D's comment:
Let $N\triangleleft G$ with $|N|=3$ and $N = \langle\sigma\rangle$. Let $H\le G$ be a subgroup of order $4$. Assume first that $H$ is cyclic and $\tau\in H$ of order $4$. Then $\sigma^\tau \in \{\sigma, \sigma^2\}$, hence $\sigma^{\tau^2}= \sigma$ for the involution $\tau^2$. If $H$ on the other hand is isomorphic to Klein's four-group, and two element $\tau,\tau'\in H$ of order $2$ both map $\sigma^\tau = \sigma^{\tau'} = \sigma^2$ its product, the third involution $\tau\tau'$ maps $\sigma^{\tau\tau'} = \sigma$.
In both cases there is an element $\rho \in H\le G$ of order $2$ that commutes with $\sigma$, hence the semidirect product is direct and cyclic of order $6$.
Comment: You can say more, namely that there must be an element of order 6 (i.e., a cyclic subgroup or order 6).
Comment: You should use `\langle` and `\rangle` instead of `<` and `>`.
Comment: Just a small comment: you don't need to worry about the structure of the Sylow 2-group to prove what I said above: it follows from the normalizer-centralizer theorem since $|Aut(N)|=2$.
Answer: An alternative way to finish Peter Patzt's argument is as follows: Once you know that $G$ has a normal subgroup $N$ of order $3$, note that $G/N$ is of order $4$ and therefore abelian. Since normal subgroups of the quotient correspond to normal subgroups of $G$ that contain $N$, and every group of order $4$ contains a normal subgroup of order $2$, this normal subgroup of $G/N$ of order $2$ lifts to a normal subgroup $K$ of $G$ that contains $N$ with $[K:N]=2$. Since $|N|=3$, that means that $K=6$, so you get a normal subgroup of order $6$.
Comment: Thanks! very clear. I accepted this one, because I'm not familiar (yet) with semidirect products.
Comment: @user6495: Your acceptance of my answeer really does not make much sense. Most of the hard work was done in Peter's answer, and all I did was to suggest an alternative argument for his last three lines. My answer would not make sense without his answer, so I really don't think my answer should be the "accepted" one.

Normal subgroups of a group of order 12


How to develop an efficient Beacon Network

Question: I'm working on ibeacon technology till now no issue while developing but now i'm concerned about the performance and cost factor. My task is to develop a network of beacons based on beacon range, proximity, accuracy. Obviously I've to use minimum number of beacon to cover the whole store.I know I've to develop some kind of graph algorithm to make neural network kind of structure.Please guide me if someone already achieve this or working on it or can give me some kind of reference to initiate.
Comment: Show us something what you have tried till not.
Comment: The number and placement of beacons can be done via a finding a circle cover for the polygon shapes of the places where beacon coverage is desired. This is NP-hard for an exact solution, but can be approximated well enough. With a variable floorplan, the min number of beacons will also be variable. Although if the exterior walls don't change, you could cover the entire area to give an upper limit on the number required. Not to mention obstructions could reduce the max range, increasing the number required or at least increasing the complexity of writing the algorithms (not the big O).
Comment: Hi @Nuclearman seems like you would need a ton of sensors. Would it not be better to grid/cluster?
Comment: yes but to create a grid i need to decide minimum no of beacons
Comment: The circle cover does give you the minimum number. Depending on how long the range is, there could be a ton. Simple grids don't yield optimum results.  The key question is if there needs to be 100% coverage of the floor plan or if it's acceptable to cover specific areas (which can be defined via polygons). Either way, circle/sphere (for the 3D case) cover yields optimum results, though difficult to compute. Even simple grids are fine for approximate solutions though, but the approximates can be rather rough with NP-complete/hard problems.
Answer: This is less an algorithmic question than a practical one.  Ask yourself these questions:

What are my app's use cases for detecting beacons -- do I need to trigger different actions for different beacons at different spots in the store?
Do multiple different actions in (1) need to be triggered in the background?
Are any of my beacons USB/wall powered?  (If battery powered, somebody needs to change the batteries periodically.  If wall powered, placement points will be limited to where power is available.)
Are there walls, columns, stairs or other obstructions that interfere with signal propagation?

If the answer to the above questions are all no (very rare), and the  goal is simply coverage of the entire store, I would sim!ply do the following:

Get a floor plan of the store.
Measure the transmitter range of your beacons 40-50 meters typical.)
Plan to mount battery powered beacons on the ceiling whever you want.
Draw circles on your floor plan with the radius of the beacon transmitter range, and move around as needed to minimize the number of beacons used.

Be sure to take into account the constraints imposed by answering yes to any of the questions above and adjust accordingly.  In my experience, these are the main drivers of beacon placement.
Comment: thanks @davidyoung but floor plan is not fixed and can't solve my problem with hit and trail because i'm developing prototype for client and based on that extend this to real one where floor plan may vary. So i have to develop some thing which can be extends furthure according to requirement.
Comment: @davidgyoung you seem to be onto something, seems like common sense but there are a truck ton of issues/variables in this whole thing. I guess they are looking for a location agnostic solution but thats dependant on the hardware no?
Answer: Also you can generate layout randomly for example 100000 times and than for each calculate becon overlaped surface and chose lowest.


Can you get Painted or Certified items in Rocket League with trade-ins?

Question: The June update recently added a rare chance for Painted items (wheels/toppers with different colours) or Certified items that track a different stat than usual to drop after matches. I wasn't able to find any information on whether or not trading in my existing toppers (e.g. 5 uncommon --> 1 rare) can result in a Painted or Certified topper. Can anyone advise as to whether they have obtained a Painted/Certified item through a trade-in as opposed to a random drop?
Comment: I've only ever got decals for DLC cars as my first-level (Rare) trade-ins and never painted or certified items.
Answer: It is most certainly possible to get a painted and/or certified from a trade up. Below are two video examples of getting a painted, and then a painted and certified item from a trade up. These items are from the latest Turbo crate but the rules apply to any items traded up.
Trade ups

Painted Endo
Painted and Certified Tachyon
Answer: I've gotten a painted Drink Helmet (it was yellow but had a fancy name to it) and I ended up trading a drink helmet, and 4 dominus royalty's for a Hearts trail, so I cannot provide a screenshot. But trust me, Psyonix also said that not all toppers are painted, but you know...
Answer:
Yes, it is possible. I managed to trade up some old uncommon toppers and got a painted zeta, no doubt you can get certified too.
Comment: It should be better to have a verified information, such as a dev validation, or a wiki entry, etc. "no doubt" is not enough.
Comment: @V4karian A screenshot is pretty darn verified.  Dev validation is not necessary, and a wiki entry, being publically editable, is just as good as what we have.


Are students required to take Linear Algebra in BS engineering programs?

Question: Is Linear Algebra required in BS engineering programs in the states?
Comment: I don't know if it's required everywhere, but I can't imagine any engineering discipline where you don't need to know some basic linear algebra.  Whether required or not doesn't change the fact that it's something you should know if you're going to be a engineer.
Comment: Since we are engineers and not academic regulators, the question may be more answerable if rephrased as, "does there exist any BS engineering program anywhere in the USA, that does not require Linear Algebra?"  As far as I know anyway, the answer would be NO.
Comment: @MarkU Do you recommend asking this question on academia stack exchange instead?
Comment: Doubtful that any engineering program could omit maths from engineering and still be accredited and produce successful engineering graduates.
Answer: Yes. Linear algebra is required for a BS in mechanical, civil, or electrical engineering as far as the programs I'm associated with.
Edit:

But is that common in most of the schools in the states?

As it's the basis for solving so many types of problems related to engineering, I would bet that for any school worth going to, linear algebra is required. Otherwise you're learning how to perform a calculation, but not why, and then you're no better than a monkey at a keyboard.
Comment: But is that common in most of the schools in the states?
Answer: As far as I know, yes, Linear Algebra (often in combination with differential equations) is a fundamental requirement for the "classic" engineering (mechanical, civil, electrical, chemical) programs, in addition, most likely, to the others.
I sincerely hope there aren't any programs in these fields that don't require training in linear algebra and differential equations. Topics such as linearity, matrix-based equation solving, and differential equations (with their continuation into frequency analysis) are utterly necessary to a proper understanding of the systems that engineers work with that I wouldn't trust anybody who wanted to work in these fields but didn't have at least a passing familiarity with the concepts in Linear Algebra.
Wanting to be an engineer that doesn't know linear algebra is like wanting to be a car mechanic who can't use a wrench, only more dangerous.
Specifically:
In the United States, the meaningful accreditation for engineering problems comes from an organization called ABET, the Accreditation Board for Engineering and Technology, who have a list of requirements for programs in engineering, by discipline, here (2015-2016): http://www.abet.org/eac-criteria-2015-2016/ .  Of the ~30 disciplines that they accredit, the following do not explicitly require coursework to cover Linear Algebra or differential equations: Aerospace, Agricultural, Ceramic, Chemical, Computer, Fire protection, Industrial, Manufacturing, Materials, Naval, Nuclear, Ocean, Software, Surveying, Systems
The following disciplines require differential equations but not (explicitly) linear algebra: Architectural, Biomedical, Biological, Civil, Environmental, Geological, Mechanical, Mining, Petroleum
As such, there may be accredited engineering BS programs that don't require linear algebra, but I hope there aren't, and I haven't heard of any.  Any accredited Electrical engineering programs will require linear algebra.
Comment: Strongly disagree there, I haven't thought of matrices since that class, but I don't do much DSP or RF. I'd say its more like an mechanic who can't use a handheld code analyzer than a wrench.
Comment: Matrices alone aren't the wrench, the wrench is the understanding of linearity that working with matrices and differential equations gives you.  Lots of (most?) engineers use DiffEq (or abstractions thereof like Fourier analysis, circuits design, E-M, control systems, just among the EE folks, and optimization models for everybody), and all of those abstractions are built on linear system models that are introduced in LinAlg/DiffEq
Comment: I'm talking strictly about linear algebra, diff EQ was a different class. To me, it was a waste of time doing math that really didn't make much sense or seem useful. Even diff EQ didn't really mean much until later.


Dubai Transit (DXB) - Do you need to install DXB Smart App?

Question: Do you need to install DXB Smart App for transiting through DXB airport? I installed it anyway on iOS and tried to register but it hangs at "Please wait" and then just does nothing.
Comment: Is there any particular reason you think it might be required?
Answer: The app seems to just be a way to get information on the covid situation in Dubai, and contact the local health authorities if necessary.
Are you required to use the app? It's hard to prove a negative, but I see no evidence. Beyond the fact that it would prevent anybody transiting who, for example, doesn't own a smartphone:
Absolutely nothing on the airport's info page for connecting passengers suggests the app is required for passengers transiting through Dubai airport. The app has been available since at least April 2020, so it seems safe to assume that a major airport like Dubai would have updated the information by now if use of this app were in any way required.
The app's pages on the app stores for Apple or Android devices don't suggest it's required, either.
Answer: Cell phone ownership is not yet mandatory, so clearly NO, you are not required to have the app installed.


Error Loading and Training on Tensorflow's 'Speech Commands Dataset'

Question: I am trying to replicate the most basic version of this Google LEAF example. I am having problems loading in the Tensorflow Speech Commands Dataset. I load the datasets in as a TFRecord:
tfds.load('speech_commands', download='true', shuffle_files='false')

I then map the train, test and eval datasets through this pre-process function:
def preprocess(sample):
    audio = sample['audio']
    label = sample['label']

    audio = tf.cast(audio, tf.float32) / tf.int16.max
    return audio, label

I then create my model and attempt to train on my train dataset:
#Model is from leaf_audio/models
model = models.AudioClassifier(num_outputs=12)
loss_fn = tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True)
model.compile(loss=loss_fn, optimizer = tf.keras.optimizers.Adam(1e-4), metrics=['sparse_categorical_accuracy'])
model.fit(train_dataset, batch_size=None, epochs=10)

On training I receive an error in the Audio Classifier layer:

ValueError: Exception encountered when calling layer "sequential" (type Sequential).
Input 0 of layer "global_max_pooling2d" is incompatible with the layer: expected ndim=4, found ndim=2. Full shape received: (None, 16000)

I think this is something to do with me loading in the data incorrectly, however, I have followed the example to the line in each of the loading steps.
For the full code please follow this link.
Answer: The problem was that the input tensor ('audio') does not supply enough dimensions to be used by the audio classifier.
The solution to this is to add more dimensions in using this line at the end of the preprocess function:
audio = audio[tf.newaxis, tf.newaxis, :]


Which soft can I use to efficiently distribute tasks?

Question: There is a rather trivial situation. We have a development team with known rates of each of them, PM/PO and sprint backlog. Each member evaluates every task in hours with planning poker. Finally we potentially know evaluation time of every task by every developer. Here the question is: how can we efficiently distribute the tasks between all the team members from the point of the busyness' view? Are there tools to do that in automatic or semi-automatic mode? Are there plugins for Jira/Redmine to do that? Thanks in advance for the answer.
Answer: I am one of the developers of https://pollunit.com
We build a feature to automatic distribute tasks according to personal preferences. You can read more about this here: https://pollunit.com/en/tutorials/distribute_tasks
This function is rather intended to avoid quarrels when choosing tasks. Maybe it will help you anyway and could be a semi-automatic solution for you ;)
If you click on "Create PollUnit" > "Voting" you see the question "What do you want to do?" If you choose "Distribute" + "Something else" you can later enter free text (task names) as options. On the next page you can open the "Further settings for advanced users" and can choose star rating (or maybe dot voting) to let your teams rate the tasks. The stars can be a abstract symbol for how unbusy they are. Or you choose "lowest resistance" as target. Then your team can make negative votes and can tell how unwilling they are to do this task.
For small teams our tool is free. So you can try it.
Comment: It seems to me a pretty interesting. I need some time to discover it. Thank you anyway.


Change in H+ ion concentration of water on boiling

Question: I know that on boiling water, pH scale decreases but water remains neutral. At 100°C the pH=6.14 is neutral.  And at this temperature also, the H+ ion concentration and OH- ion concentration are equal.
My question is what happens to the  H+ ion concentration on boiling  relative to the concentration at 25°C? Does it increase or decrease or remain same?
Comment: It seems like you answered your own question: as you said, at 100 °C the $\mathrm{pH} = 6.14$, and $[\ce{H+}] = 10^{-\mathrm{pH}}$.
Comment: @andselisk You mean [H+] increases, but then [OH-] too increases equally. So in this case how is it that decrease in pH implies increase in [H+] as now the pH scale itself has changed?
Comment: I'm afraid I don't understand what you are trying to imply. The pH scale itself is a superficial term (e.g. typical claims that pH can only take 0 - 14 values and pH 7 is always neutral) to the point it's almost a meme.
Comment: So according to your previous comment, [H+] increases as pH=6.14 . But I don't want to get that one word answer, I would rather like to have an explanation for my question i.e., how does [H+] changes with change in 'pH scale'(not pH I repeat)?
Answer: It is an interesting question, however there is a misconception. You are giving too much attention to the word neutral. The word neutral is just a qualitative version. Numbers and equations are more accurate way to discuss science.
You have to see how water's $\pu{pH}$ at 100 °C is calculated. How do you get those numbers? Lets us do it algebraically, so that the word neutral does not matter.
Autoionization of water at temperature T:$\ce{ H2O <=> H+  + OH-}$, if the conc. of $\ce{H+}$ is x, the quantity of $\ce{OH-}$ is also x, if you have accepted the ionic product of water is
$K_\mathrm{w} = [\ce{H+}][\ce{OH-}] = x^2=
51.3\times{10^{-14}}$
Solve for $x = [\ce{H+}] => -log [\ce{H+}] = 6.14$
So the numbers prove that $\pu{pH}$ has changed. Water has become slightly acidic. If you associate the word neutral = 7.0 at 25 °C. However, if you use the word neutral with respect to water temperature, then $\pu{pH}$ of 6.14 is neutral at 100 oC. Ultimately, the numbers Kw and pH matter, nobody will quibble about the word neutral in serious research.
Water is the most amazing solvent in Nature. People are still exploring its properties and it is yet to be fully understood. For example, I just heard in a conference that someone was trying to understand what happens on the surface of micron sized water droplets. "Pure" water showed very odd chemical effects which have never been shown before.
Read this well written Wikipedia article: https://en.wikipedia.org/wiki/PH#cite_note-2
Comment: https://chemistry.meta.stackexchange.com/questions/86/how-can-i-format-math-chemistry-expressions-here https://chemistry.meta.stackexchange.com/questions/3044/hidden-points-of-editing-you-probably-didnt-know


Should I re-do this cinched PEX connection?

Question: It is tight against the connector on the other side, but not quite even on this one. (See pic). It is not leaking and seems to be working well. Just don't want issues down the road and don't know how precise this needs to be.
Comment: In my non-professional, no-liability-taken opinion as someone who has done a fair amount of home modification with that kind of PEX crimper.....you're fine.  No need to re-do.
Comment: So you think I'm alright to leave it?
Comment: I'm starting to think the bigger problem may be that my cinches are more than 1/4 from the end of the pipe and not attaching to the two center barbs
Answer: I'd be less concerned about the squareness of the cut and more concerned about whether you've got the crimp ring on more than 1 barb.   You've angled the two crimp ears to the same spacial area and cause the horizontal crimp ring to be further from the fitting than it should be.  Put a 90 fitting up and see how many of the barbs your crimp ring is hitting.
The vertical crimp has the correct spacing from the end of the fitting.  The horizontal crimp in both is pushed out.
While you may not have leaking now, what you do have is a crimp that is less resistant to sudden pressure changes and is more likely to blow off in the future.
It can be hard to get a really square cut on pex.  I like the sharkbite 23369CA pipe cutter as cuts more square than any other cutter I've used ( I have 5 different ones ).  I like my plumbing to look perfect but then I don't have to do production work so I can afford to spend 2-3 times as long per crimp as a production plumber.  Be careful if you do use the 23369CA and if a piece of pipe gets stuck in it never clear it with your digits.
Comment: Between my un-even PEX pipe cuts and the spacing issue, I ended up re-doing them. I can sleep better now when the drywall goes up.  Thanks very much for your help.
Comment: A new picture when you get home of a bare fitting lined up with this will show how much of an issue that is, or is not.
Comment: Glad you noticed the distance issue. So does the back edge of the fitting before it tapers count as a barb or only the two in the middle of the fitting? I'm going to check that out when I get home. Thx.
Answer: If it didn't leak and doesn't leak after you crimped it, it won't start leaking because the end cut is imperfect.
If you were a wet-behind-the-ears apprentice for a plumber that gave a darn, sure, the master who you were working under would make you cut it out and redo it so everything looks perfect, and you'd learn not to do it that way in the future to avoid being made to redo it. Or go into a different trade.
The actual seal is made nearer the clamp. The tubing beyond the clamp is mostly not involved. A little bit is.
3 of the 4 connections are visibly not perfect right angle cuts. The red one coming up looks pretty good. None of them are bad enough to matter. The yellow line is an approximation of "bad enough to matter" where the cut end starts impinging on the part of the tube being compressed by the clamp.
Note that the illustrated "bad cut angle" is quite extreme. There's tolerance for real world working conditions built-in.

So, the TL;DR: Make an effort to do better in the future - yes. Redo this - only if it will haunt your perfectionist tendencies.
Comment: Thanks for this. Your line drawing helped a lot. Ended up re-doing them.
Answer: Page 23 of the PPFA PEX installation guide addresses this; it is best practice to make sure every cut is square.

The tubing should be cut squarely and evenly without burrs. Uneven, jagged or
irregular cuts will produce unsatisfactory connections.

The diagram shows a correctly cut tube compared with an incorrectly cut tube.

The referenced diagram:

Another question you did not ask, but may influence your decision of whether to replace: PEX install guides require 1/8" of slack per 1 foot of run for thermal expansion/contraction. You can find this in the linked install guide. Both the red and blue tubing in your photo look like they may be too short.
Comment: Got it. So should I re-do it? And if so can I reuse compressed part of the PEX pipe (where the cinch is) or do I need to cut it off too?
Comment: I think this is a matter of opinion; crip says (in a comment) that it's cosmetic. I think this is probably OK but personally I would re-do it, unless it'd be really expensive to do so (like if this ran all the way across the house). If you decide to re-do it, installation instructions say to cut all of the previously-crimped part off because the ribbed tubing can cause incomplete seal.
Comment: If it ran all the way to the other end of the house and you wanted to re-do it, you'd just crimp in a coupling if it was too short so you could extend it, not replace 50 feet of pipe.
Answer: That crimp would keep me up at night. It is way to far from the edge. I'll upload a picture of my work later once I am home.
Apollo makes guided crimp rings for this exact reason:

As you crimp the ear, the little red thing just falls off.
Even if you don't buy them, just look at how close to the edge is considered ideal.