recently, some natural products have been used in the fields as alternative to synthetic compounds, to minimize the negative impacts to the environment. this study aimed to verify the effects of neem-based bio-pesticide in causing acute toxicity for a fish and chronic toxicity for a microcrustacean. to this end, danio rerio and daphnia magna were exposed to various concentrations of a neem-base...

habrobracon hebetor say (hymenoptera: braconidae) as an ectoparasitoid of larval stage of lepidopterous pests is widely used in biological control programs. in the present research, the effect of field recommended doses of imidacloprid, indoxacarb and deltamethrin were studied on life table parameters of h. hebetor in pupal stage treatment. one hundred, two-day-old pupae were treated with 1 mic...

it has been revealed that the surface stress effect plays an important role in the mechanical behavior ofstructures (such as bending, buckling and vibration) when their dimensions are on the order ofnanometer. in addition, recent advances in nanotechnology have proposed several applications fornanoscale shells in different fields. hence, in the present article, within the framework of surfaceel...

objective: the effects of natural adjuvants were examined on total and differential wbc counts in lung lavage of sensitized guinea pigs. materials and methods: in three sensitized groups of guinea pigs including: untreated sensitized animals (s), sensitized animals treated with adjuvant g2 (s+g2) and g2f (s+g2f) as well as non-sensitized group (c) (n=6 for each group), total and differential wb...

earthquakes in urban areas leave behind a considerable amount of debris, which delays the relief services and the reconstruction activities. the relief work would be impossible without the removal of debris from the main access roads to the devastated areas. the proper implementation of this endeavor requires a long-term management of debris. this article discusses development of strategic mana...

the hcci combustion process is initiated due to auto-ignition of fuel/air mixture which is dominated by chemical kinetics and therefore fuel composition has a significant effect on engine operation and a detailed reaction mechanism is essential to analysis hcci combustion. a single zone-model permits to have a detailed chemical kinetics modeling for practical fuels. in this study a single-zone ...

the natural vibrations of clamped annular isotropic sector plates are analyzed using the extended kantorovich method (ekm). a conformal mapping is used to transform a sector with identified geometry to a rectangular plate which the solution is available in literature and solved by dalaei and kerr [1] using ekm. the developed iterative scheme converges very rapidly to the final result. the obtai...

the goal of this research is the evaluation of some of the effective environmental attractions on khorasan razavi’s sports tourism development. the research statistical population include of all in charge expert and professors in field of sport and tourism as 120 persons. this research is past-event descriptive that had been performed based on field method. sampling had been performed as catego...

background; environmental gamma ray refers to the gamma radiation from terrestrial sources and building materials. in enclosed spaces radiation can become a health hazard leading to potential increase in the rates of lung cancer. the goal of this study is to assess the exposure to natural gamma radiation of children in the schools of zanjan province. method; the natural gamma radiation was asse...