the house fly, musca domestica l., is known as one of the most important hygiene problems worldwide. it has shown a high potential to develop resistance to chemical insecticides. this study was undertaken to determine the susceptibility or resistance of the house fly, which were collected from 3 livestock farms near the city of ahvaz, to prevalent pyrethroid insecticides (delthamethrin, lambda-...

Excessive water production through fractures become an important problem in oil exploration of fractured reservoirs. For this purpose, polymer gels were prepared by crosslinking of aqueous solutions of polymer and crosslinker for the purpose of water management in high water cut fractured reservoirs. A copolymer of sulfonated polyacrylamide was used as polymer and chromium triacetate (Cr(OA...

with the prolonged use of domestic centrifugal pump, due to erosion, corrosion and an unbalance the sever vibration of the pump are resulted. an erratic sound coming out of pump makes the user uncomfortable. here, tuned vibration absorber (tva) is used as a vibration controlling device. it is designed to reduce the rms velocity below 20% of the circumferential speed, at which the impeller is ba...

A hydrogel was prepared by crosslinking aqueous solutions of sulfonated polyacrylamide/chromium triacetate for use in water shut off operations. Gel swelling and the effects of salinity, injection time and flow rate on residual resistance factor (Frr) were investigated. In the presence of electrolytes, gel swelling decreased by about 80%. Results showed that oil permeability increased as inject...

Materials such as waste tire chips were widely used to improve the strength of soil. The objective of this study is to discuss the residual strength or steady-state behavior of sand-waste tire chip mixtures. A series of undrained monotonic triaxial compression tests were conducted on reconstituted saturated specimens of sand and sand-tire chip mixtures with variation in the tire-chip contents f...

Purpose. Determination of the required concentration polymer solution, providing maximum well insulation effect, depending on filtration characteristics medium. Methodology. The research was conducted by experimental method using methodology planning experiment. theory rational used varying two variables five levels. Media permeability and solution were as variables. Methods mathematical statis...

anti-larval measures were carried out in and around the city of abadan in conjunction with residual spraying against the only malaria vector of the area.  a.stephensi which has developed resistance to both ddt and dieldrin. there is evidence that larviciding is a valuable measure for reducing the a. stephensi population when used as a supplement to malathion, which has relatively short residual...

The effects of cannabis on lung function remain unclear and may be different from those of tobacco. We compared the associations between use of these substances and lung function in a population-based cohort (n = 1,037). Cannabis and tobacco use were reported at ages 18, 21, 26 and 32 yrs. Spirometry, plethysmography and carbon monoxide transfer factor were measured at 32 yrs. Associations betw...