the purpose of this study was comparison of applicability of tertiary treatment of tehran domestic sewage with organic and inorganic coagulants or a combination of them. the far test procedure was applied utilizing: alum, polyelectrolyte wt 2600, anionic polyelectorlyte wt 3000, and nonionic polyelctrolyte wt 2690 as organic coagulants (products of calgon). the combination of lime with each of ...

Some authors in fact refer to episodes as chemical arachnoiditis. Jolles et al. at the National Institute for Medical Research, London, ( [1] ) discussed Drug-induced aseptic meningitis (DIAM), which they denoted as "uncommon." The authors remarked that most of the literature comprises anecdotal case reports. The major types of causative drugs are nonsteroidal anti-inflammatory drugs ...

The use of chemical compounds benefits society in a number of ways. Pesticides, for instance, enable foodstuffs to be produced in sufficient quantities to satisfy the needs of millions of people, a condition that has led to an increase in levels of life expectancy. Yet, at times, these benefits are offset by certain disadvantages, notably the toxic side effects of the chemical compounds used. E...

• The White House Office of National Drug Control Policy conducted a survey and found that between 1988 and 1995, Americans spent over $57 billion on illegal drugs of abuse. • The Lewin Group for the National Institute on Drug Abuse found that in 1992, the estimated total economic cost of alcohol and drug abuse was $245.7 billion. This estimate included the cost for substance abuse treatment, c...

In this work, we formulate a nonlinear programming model for the design of an integrated microalgaebased biorefinery for the production of biodiesel and value added co-products which depend on the particular microalgae species considered. The production of biogas by anaerobic digestion of the oil cake together with waste streams is included. The process scheme includes the possibility to use gl...

During the past century, there has been a dramatic increase in the number of chemicals produced. Worldwide, there are more than 5 million known chemicals, with an additional 10,000 to 20,000 new chemicals developed each year. Furthermore, an estimated 500,000 unique shipments of hazardous materials occur daily throughout the United States, resulting in thousands of exposures to hazardous materi...

In this paper, we propose a new model-based approach for the fault diagnosis of hybrid dynamic systems (HDS), in particular discretely controlled continuous system (DCCS). The goal is to construct a diagnosis module (called diagnoser) able to diagnose parametric and discrete faults. Parametric faults are characterized by abnormal changes in some system parameters whereas discrete faults are att...