Research on Force and Thermal Phenomena of Short Circuited Melted Mark in Electrical Fire
This paper mainly does a research on force and thermal phenomena of short circuited melted mark in electrical fire. The primary short circuited melted mark and secondary short circuited melted mark were prepared by the experiment, and were characterized by metallographic microscope, powder X-ray diffraction, scanning electron microscope and energy dispersive spectroscopy, the role of forces and heat in short circuited melted mark in electrical fire were demonstrated and investigated. It is found that they show a similar shape that the melted ball close to one side for anode melted marks, and their particles show the specific and uniform direction and the most particle size of anode melted marks are larger than the particle size of cathode melted marks, both below the copper wire grain size 64.2nm, similarly, it can be clearly seen that the ratio of O: Cu in deposit layer of all melted marks are below 0.5. Finally, these above special phenomena gave short circuited melted mark the primary statement from the theoretical point of view.
Analysis and clarification about appendix C in GB/T 6394—2002 "Metal-methods for estimating the average grain size"
Through analysis and clarification of Appendix C in GB/T 6394-2002 "Metal-methods for estimating the average grain size" ,it is shown that there are many parts,paragraphs and wordings to be deliberated in the standardized version.
The peculiar thermo-structural behavior of the anionic lipid DMPG.
Aqueous dispersions of the anionic phospholipid dimyristoyl phosphatidylglycerol (DMPG), around 100 mM ionic strength, are known to exhibit a thermal behavior similar to that of the largely studied lipid dimyristoyl phosphatidylcholine (DMPC), which undergoes a gel to liquid crystalline phase transition at 23 degrees C, well characterized by differential scanning calorimetry (DSC), and other methods. However, at low ionic strength, DMPG has been shown to present a large gel-fluid transition region, ranging from 18 to 35 degrees C. This intermediate phase is optically transparent and characterized by a continuous change in membrane packing. Structural properties of the DMPG gel-fluid transition region will be discussed, based on results obtained by several techniques: electron spin resonance (ESR) of spin labels at the membrane surface and intercalated at different depths in the bilayer; light scattering; DSC; small angle X-ray scattering (SAXS); and fluorescence spectroscopy of probes in the bilayer.