My wife and I were happily living in a nice duplex in a cool area of Pittsburgh till my job went sour. We then moved to Reading, PA for a better job. I got into a apartment complex that is about 25 older buildings in one complex. They advertised that they provide heat. They have one large boiler in each building and they control the boiler. It runs to the registers to every room in the building, and there is no valve or control on the register.
CTD is the abbreviated name for an instrument package that includes sensors for measuring the Conductivity, Temperature and Depth of seawater. The NOAA EOI Plume Studies Group uses a SeaBird 911plus CTD.
1 CTA is a type of exam that uses CT technology to look at blood vessels.  A CT scanner rotates to take X-ray images from different angles all around your body. A computer puts these images together to form detailed, two-dimensional pictures.