Industrial and domestic equipments use non-linear electronic components. As examples of these nonlinear loads: rectifiers, inverters, choppers or in a general manner, all equipments using the electronic switches and the junctions with semiconductors. This creates non sinusoidal electrical currents which will be injected in the electrical supply network. These non sinusoidal currents present oth...

A causal link between the increasing environmental pollution and the fast spreading of allergic diseases is currently discussed. The exogenic and endogenic noxious agents contributing to the total environmental load are primarily acting through immunotoxic, sensitizing and neurotoxic mechanisms in animal experiments and in humans. Beside classic allergic-triggering factors (allergen potency, in...

Decontamination, i.e. cleaning by removal of chemicals or germs, is a term commonly used for the process of treating devices, instruments and surfaces in order to ensure their safe operation. It is of exceptional importance in healthcare, food and pharmaceutical industry as well as in the areas of army and public defense. The decontamination process covers several steps like simple washing with...

As a bridge between the economy and society, air transportation plays an important role, aircraft engine, which is “heart” of aircraft, key to achieve all this. However, in recent years, particulate matter emission carbon dioxide greenhouse effect have brought serious pollution world are great concern. Therefore, this paper will be based on concepts low carbon, green, energy saving, environment...

Nitrate nitrogen pollution in groundwater can be understood from three viewpoints: generation sources, mobility, and elimination effects (natural purification effects). Alluvial fans are often utilized for farmland where nitrate fertilizer (pollutant source) may used. pollutants readily spread at alluvial two controlling factors pollutant mobility high: permeability hydraulic gradient of ground...

Most existing methods for calculating the steady state solution of the lattice Boltzmann equations are based on pseudo time stepping, which often requires a large number of time steps especially for high Reynolds number problems. To calculate the steady state solution directly without the time integration, in this paper we propose and study a nonlinearly preconditioned inexact Newton algorithm ...

A new concept of periodically rotating biotrickling filters was developed for parallel operation of multiple bench scale biotrickling filters without the requirement for expensive equipment such as liquid recycle pumps and air flow regulation. The performance of 20 identically operated rotating biotrickling filters was reproducible with an average toluene elimination capacity of 79.4 g m h (sta...

This study aimed to examine the usefulness of locally found gastropod snail, Nerita lineata as suitable biomonitor for metal pollution. The accumulation and elimination of chromium (Cr) and lead (Pb) was examined by exposing N. Lineata to different concentrations of Pb (1-4ppm) and Cr (12-15 ppm) under controlled laboratory conditions. The experiments were allowed for four days of accumulation ...

for pulp and paper manufacture. The science, a proven environmental track record, and strong market demand demonstrate that ECF is without rival in terms of pollution prevention, resource conservation, and product quality. "Chlorine dioxide is a solution to dioxin and other persistent, bio-accumulative, toxic substances in mill waste water." [1] Dr. Robert Huggett, former U.S. EPA Assistant Adm...

background: this study aims to investigate the patterns of bioaccumulation and depuration of copper in the selected kidney and liver of capoeta fusca. methods: the fish were collected between september and november 2010 from a qanat in birjand. they were exposed to two types treatments with copper (0.25 and 0.75 mg/l) for a period of 41 days. the fish under study were exposed to the above-menti...