background : leishmaniasis is an important public health disease in many developing countries as well in iran. the main objective of this study was to investigate on leishmania infection of wild caught sand flies in an endemic focus of disease in esfarayen district, north east of iran. methods : sand flies were collected by sticky papers and mounted in a drop of puri’s medium for species identi...

conventional sand filtration which has become a common wastewater treatment technology to satisfy regulations appointed for effluent reuse, suffers from the disadvantage of high energy for backwashing. the subject of this study is application of downflow floating media prior to coarse sand filtration, which requires less water for backwash. two pilots have been employed in two stages. for the f...

This paper focuses on the response of circular machine foundation resting on different soils (sand and clay) through studying the variation of soil shear strength parameters and strain with the number of cycles. The objective of the current study is to explore the results related to the parameters of the dynamic load (number of loading cycles and frequency of load) related to the circular footi...

In this work, biosurfactant production by a Pseudomonas aeruginosa strain was optimized using low-cost substrates. The highest biosurfactant production (3.2 g/l) was obtained using a culture medium containing corn steep liquor (10% (v/v)) and molasses (10% (w/v)). The biosurfactant reduced the surface tension of water up to 30 mN/m, and exhibited a high emulsifying activity (E24=60%), with a cr...

The Yellow River Basin is one of the important sand-producing and sediment-transporting areas in China, three most world. amount sand dust days “Three Norths” (Dongbei, Xibei, Huabei) area has increased, regional storms have occurred frequently. There are generally more serious hidden danger points debris flow geological disasters small medium-sized river basins. technical achievements flood ri...

Johansson. T. 1995. Site index curves for Norway spruce plantations on farmland with different soil types. Studici Forestulia S~lecicu 198. 19 pp. ISSN 0039-3150, ISBN 91-576-5089-6. Growth data were collected from 157 Norway spruce (Picea abies (L.) Karst.) stands planted on farmland in Sweden. The stands ranged in latitude from 55'N to 66'N. The mean age of the stands was 41 years (range, 25-...

an investigation was carried out in ahar district, (a new focus of visceral leishmaniasis), eastern azerbaijan, north-west of iran in order to determine the vector(s) of the disease, during the summer of 2003 sand-flies were collected using sticky papers, cdc light traps and aspirators. all of the collected sand-flies were dissected in a drop of normal saline for surveying of promastigotes. hea...

Due to the rapid development of civil engineering industry, natural medium and coarse sand resources are increasingly scarce. If desert is studied applied in field engineering, shortage high unit price can be greatly solved.Therefore, it very important study instead ordinary sand. Although application has made development, many engineers researchers have done a lot experiments in-depth research...

Because of the nitrogen pollution problem in groundwater, migration conversion mechanism groundwater level fluctuations was analyzed. Technology and methods through indoor experiments theoretical analysis were used to study coarse sand, medium fine sand fluctuation aeration zone saturated under situation distribution characteristics, revealing with mechanism. The experimental results showed tha...

We measure experimentally the penetration depth d of spherical particles into a water-saturated granular medium made of much smaller sand-sized grains. We vary the density, size R, and velocity U of the impacting spheres, and the size δ of the grains in the granular medium. We consider velocities between 7 and 107 m/s, a range not previously addressed, but relevant for impacts produced by volca...