Chemists, biologists, ecologists, and engineers have been developing a data-base to identify and evaluate risks to humans and the environment and strategies to minimize potential risks from large-scale coal liquefaction. Coal-liquids produced by various processes and under various stages of...

Chemically complex materials produced by several coal-liquefaction processes and under various stages of process design and operating conditions have been screened for potential health and environmental effects. Biologically active materials have been fractionated and rescreened. Chemical...

Two computationally simple methods for calibrating the gravity model are presented in this paper. The use of each is demonstrated on several origin-destination trip tables, and the results compared with those obtained from the UTP system gravity model calibration procedure. Our methods, based on...