This study focuses on the impact of landfill high concentration solutions erosion on geosynthetic clay liner (GCL) materials permeability. The permeation tests on the GCL, submerged using different kinds of solutions with different concentrations, were carried out systematically by taking these chemical solutions as permeant liquids. Based on seasonal variations of ion concentrations in Chenjia...

This paper presents a mathematical model for a chemical process used to machine cristal as glass or silica. A short physical description is presented from which we draw the mathematical model. We obtain a coupled parabolic equations system on a free boundary domain with a non-linear condition on the boundary. The existence and the uniqueness is proved in the one-dimensional case.

Iraq has used extensively chemical warfare agents in recent Iran-Iraq conflict (1980-1988) and it is believed about 450,000 people were exposed to this agents. Long-term effects of chemical warfare agents, particularly mustard gas, on pulmonary function tests (PFT) (VC, FEV1 , FVC, FEV/FVC, PEF, MEF50%, MEF25%, MEF25-75% , ERC and IC) are estimated during 7.7 [standard deviation (SD)=l.2] years...