This project implements the control of an AUTOMATIC GAMMA
WELL counting system with an AIM-65 microcomputer. All
states and control signals to and from the AIM-65 are
obtained via three VIAs (Versatile Interface Adaptors).
Motor controls were implemented using triacs, operational
amplifiers and TTL logic devices while the RTC (Real...
Soil particles contain a variety of natural and anthropogenic organic components, and in urban areas can be considered as local collectors of pollutants. Surface soil samples were taken from ten urban areas in Riyadh during early winter of 2007. They were extracted with dichloromethane-methanol mixture and the extracts were analyzed...