نتایج جستجو برای: pinpoint chamber
تعداد نتایج: 45918 فیلتر نتایج به سال:
A computational study aiming to investigate the effect of combustion chamber geometry on combustion process and emission has been carried out in a direct injection diesel engine. The combustion process and emission of three different combustion chamber geometries were considered, and combustion process behaviors such as variation of mean pressure, velocity, heat release rate, emission productio...
to reduce the storing space and handling costs for hay/straw bales, recompressing the original bales after adequate hay drying is recommended. in this project, a recompression machine was designed, constructed and evaluated. solidwork and nastran software were employed to model, and to analyze the stresses in the components of the machine, respectively. the components of the machine consisted o...
Background: The need for high-quality education and setting principles and practices for enhancing educational policy and practice using modern techniques is self-evident. The entrance of students into the factories is sometimes limited, and of particular concern is that students likely face danger by their presence at the workplace. A review of the related literature revealed no research inv...
ewe abortion and neonatal mortality are serious problems to sheep farmer. the objective of this paper was to report isolation of erysipelothrix rhusiopathiae from aborted fetuses in a flock in tehran, iran. abortion occurred in 10% of ewes in the flock. the fetuses were well developed and pinpoint, necrotic-like lesions were recorded on the placental cotyledons, whilst the inter -cotyledonary a...
Background: Separate radon and thoron measurements in soil are very important in assessment of internal exposure due to inhalation of such radioactive gases. Materials and Methods: In this study, a low cost, small size, passive diffusion chamber has been developed for simple measurement of Radon-222 and Radon-220(Thoron) gases separately in soil. The diffusion chamber consists of two films and ...
there are some evidences on elamite seals that show iranian people had enough knowledge to construct small dome on cylindrical spaces like silo in the third millennium bc. but the foundations of large dome over square spaces were formed in the parthian period. bazeh-hur dome chamber with the corners of wood in khorasan province is the most ancient dome from the sasanian dynasty. since the sasan...
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