The number of semester credit hours required for an associate degree depends on the college and degree program. In general, an associate degree takes two years full time and represents half the work required for a bachelor's degree.
A dekatherm (dth) is a unit of energy used primarily to measure natural gas, developed in about 1972 by the Texas Eastern Transmission Corporation, a natural gas pipeline company. It is equal to 10 therms or 1,000,000 British thermal units (MMBtu).
TDLAS is one of the most sensitive, selective and robust technologies for trace gas monitoring. It is based on the Lambert-Beer law which states a logarithmic relation between the. 1  transmission of light through a gas. 2  product of the attenuation coefficient of the gas.  distance the light travels through the gas.