The current investigation aimed to assess the impact of land use changes on groundwater quality because extensive mining activities in coal province Mahan River catchment area, which is located Surguja district Chhattisgarh, India. water index (WQI), Collin’s ratio, stable isotope ratios molecules (δ18O and δD), various physicochemical parameters were measured determine suitability for domestic...

vibration in the air slide tables of ultra precision machines prevents gaining accuracies within nanometer level. in this work, dissimilar types of internal vibration including small vibrations and pneumatic hammers have been tested and some measures have been offered to reduce their effects. this paper has also proceeded to the vibration tests on the air slide tables built with different numbe...

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The increased obstetrical risk associated with diabetes first recognized in pregnancy, i.e., gestational diabetes, was first described in the postwar period by Dr. J. P. Hoet in a paper written in French and translated into English by Dr. F.D.W. Lukens for publication in Diabetes in 1954 (1). Not long after that the National Institutes of Health developed a program in the epidemiology of chroni...

air pads are applicable in ultra precision machines very much. two main components of these machines, spindle and table, use the advantages of such systems. the performance and efficiency of air pads have big influence on the whole machine quality. parameters affecting pressure distribution of air tables may be considered as, 1) air compressing method, 2) air nozzle diameter, shape, and size, 3...

background and objective: bioaerosols are particles of microbes, viruses and derivatives; they exist in a wide variety of shapes and sizes and can be measured with different air samplers. the purpose of this study is the determination of bacterial aerosol in the air of hospitals and the determination of contaminated areas for disinfection proceedings by hospital health care teams, by selecting ...

background: contemporary development of growing urban communities and increasing the economical and industrial activities in the current century without paying attention to assess the effect of these activities on human health, as the axis of the development, is caused urban air pollution and risks from different pollutant emissions. tehran air pollution has received considerable media coverage...