نتایج جستجو برای: temperature distribution.

تعداد نتایج: 1029354  

Journal: :journal of crop protection 0
mehrnoosh jafari department of bio-system mechanic engineering, faculty of agriculture, tarbiat modares university, tehran, iran. saeid minaei department of bio-system mechanic engineering, faculty of agriculture, tarbiat modares university, tehran, iran. naser safaie department of plant pathology, faculty of agriculture, tarbiat modares university, tehran, iran. farah torkamani-azar department of electrical engineering, college of electrical and computer engineering, shahid beheshti university, tehran, iran. mehdi sadeghi department of horticultural sciences, faculty of agriculture, tarbiat modares university, tehran, iran.

many environmental and physiological factors affect plant temperature. the objective of this study was to use thermal imagery to investigate robust features for early diagnosis of botrytis cinerea infection in cut rose flowers under the postharvest application of methyl jasmonate (meja). three cases treated with different concentrations of meja (0.1, 0.2, and 0.3 µl.l−1), a control (0 µl.l−1 me...

Journal: :journal of agricultural science and technology 2010
h. saremi l. w. burgess

environmental factors mainly temperature are believed to determine the distribution and population dynamics of fusarium species in a natural ecosystem. species may be restricted in their distribution by adaptation to specific sets of soil environmental conditions. population dynamics of five fusarium species representative of different climatic conditions were studied at three levels of tem...

Journal: :international journal of nanoscience and nanotechnology(ijnn 0
m. salehian faculty of physics and energy engineering, amirkabir university of technology, tehran, islamic republic of iran a. mohammadian department of physics, tehran central branch, islamic azad university, tehran, islamic republic of iran m. vaezzadeh department of solid state physics, faculty of physics, k. n. toosi university of technology, tehran, islamic republic of iran m. saeidi department of physics, faculty of basic sciences, shahed university, tehran, islamic republic of iran

in this paper, the effect of size on melting temperature of metallic nanoparticles (au, pb and bi) is theoretically simulated and explained. in this regard, the cause of difference in various experimental data is introduced, which is the difference between nanoparticles’ grain gaussian distribution. this volume-depended model with the help of the gaussian distribution can describe the relation ...

Journal: :journal of industrial engineering, international 2010
s.a oke i.o oyedokun o.s momodu o.g akanbi f.a oyawale

this paper presents a mathematical model that could assist in measuring, monitoring and controlling tem-perature variation in cold and ‘red-hot’ metal working conditions of machining. a numerical analysis tech-nique of the temperature distribution, based on the theory of complex applied potential, was carried out using the principles of relationship analysis between the paths of heat supply in ...

Journal: :international journal of iron & steel society of iran 2005
ahmad saboonchi sayyed majid aghili

the objectives in the cold rolling process include improved sheet surface quality, enhanced steel mechanical strength, and better solidification operations. given the increasing demand for higher steel surface quality, more rapid production, and thinner steel plates, more attention has been directed toward the parameter of temperature in cold rolling as a means of achieving the above objectives...

Journal: :international journal of optics and photonics 0
zahra danesh kaftroudi department of engineering sciences, faculty of technology and engineering east of guilan, university of guilan, 44891-63157, rudsar-vajargah, iran esfandiar rajaei department of physics, university of guilan, 41335-1914, rasht, iran

in this study, we have theoretically investigated the effect of electron stopper layer on internal temperature distribution of high performance vertical cavity surface-emitting laser emitting at 1305 nm.  simulation software pics3d, which self-consistently combines the 3d simulation of carrier transport, self-heating, gain computation and wave-guiding, was used. simulation results show that cha...

Journal: :international journal of automotive engineering 0
pashazadeh masoumi teimournezhad

the objective of this study was to develop a numerical model for the prediction of temperature distribution, effective plastic strain distribution, and especially material flow in friction stir welding of copper plates. the deform-3d software was used by incorporating a lagrangian incremental formulation. threedimensional results of the material flow pattern which were extracted using the point...

Journal: :international journal of iron & steel society of iran 2006
a. saboonchi n. mansouri

transfer table is an essential stage between roughing and finishing rolling stands in a hot-strip rolling mill. high temperature and long time that strip is exposed to air at this stage cause a considerable heat loss that accounts for uneven temperature distribution, non-uniform surfaces, reduced product quality and increased production costs. using thermal shields on the transfer table is cons...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم و فنون مازندران 0

مدل روزنه های موازی موج دار (corrugated oarallel bundle model) برای تعریف اثر ساختمان روزنه ها در نفوذ-واکنش (diffusion and reaction) در کاتالیستهای متخلخل بکار می رود. در مدل روزنه های موج دار، از یک دسته روزنه های اصلی (pore) استفاده شده است . هر یک از این روزنه های اصلی دارای یکسری عناصر روزنه می باشد که هر عنصر دارای یک شعاع تعیین شده به صورت اتفاقی از یک توزیع اندازه روزنه ها (pore size di...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1389

run-out-table (rot) is located between last finishing stand and down coiler in a hot strip mill. as the hot steel strip passes from rot, water jets impact on it from top and bottom and strip temperature decreases approximately from 800-950 °c to 500-750°c. the temperature history that strip experience while passing through rot affects significantly the metallurgical and mechanical properties, s...

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