نتایج جستجو برای: pore

تعداد نتایج: 40268  

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...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2009
hojjat nowroozi ramin bozorgmehry boozarjomehry saeid jamshidi mahmoud reza pishvaie

development of pore network models for real porous media requires a detailed understanding of physical processes occurring on the microscopic scale and a complete description of porous media morphology. in this study, the microstructure of porous media has been represented by three dimensional networks of interconnected pores and throats which are designed by an object oriented approach. afterw...

Journal: :Cell 2013
Rebecca L. Adams Susan R. Wente

Advances in imaging and reductionist approaches have provided a high-resolution understanding of nuclear pore complex structure and transport, revealing unexpected mechanistic complexities based on nucleoporin functions and specialized import and export pathways.

Journal: :Cell 2011
Amnon Harel Yosef Gruenbaum

Structural determination of the nuclear pore complex has been limited by the complexity and size of this cellular megalith. By taking advantage of exceptionally stable nucleoporins from the thermophilic fungus Chaetomium thermophilum, Amlacher et al. (2011) provide new insight into a core element of the nuclear pore scaffold.

Journal: :transport phenomena in nano and micro scales 2013
h. moghadam a. samimi a. behzadmehr

nanoporous anodic aluminum oxide (aao) has been used in many different fields of science and technology, due to its great structural characteristics. solar selective surface is an important application of this type porous material. this paper investigates the effect of nanoporous aao properties, including; film thickness, pore area percentage and pore diameter, on absorption spectra in the rang...

Journal: :تحقیقات مهندسی کشاورزی 0
علی دیندارلو دانشجوی سابق کارشناسی ارشد علیرضا سپاسخواه استاد گروه آبیاری و زهکشی دانشکده کشاورزی، دانشگاه شیراز

solute transport processes are affected by soil pore water velocity distribution. pore size distribution, which can be used to infer pore water velocity distribution, can be estimated from a soil water retention curve (n). in this study, a solute breakthrough curve was simulated using soil hydraulic parameters in four different soils. to evaluate the proposed model, predictions were compared to...

Several methodologies published in the literature can be used to construct realistic pore networks for simple rocks, whereas in complex pore geometry formations, as formed in tight reservoirs, such a construction still remains a challenge. A basic understanding of pore structure and topology is essential to overcome the challenges associated with the pore scale modeling of tight porous media. A...

Journal: :علوم باغبانی ایران 0
حسین مزاری دانشجوی سابق کارشناسی ارشد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج مجتبی دلشاد دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج عبد الکریم کاشی استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

soilless media have different physical properties. change in air space of mix substrate can cause change in fertigation management and plant growth and yield. physical properties (water holding capacity, effective air-filled pore space, effective pore space) of 50 mixed substrates were measured to evaluate the effect of air-filled pore space on growth of tomato transplant and it's water us...

Journal: :تحقیقات آب و خاک ایران 0
حجت احمدی حسن رحیمی عباس سروش عبدالحسین هورفر

constant rate of strain (crs) consolidation is a rapid test method used for determination of compressibility of clayey soils. in a crs test, the appropriate strain rate is selected based on pore water pressure ratio, i.e. the ratio of pore pressure to total stress. in the present study, to investigate the effect of strain rate on variation of relative pore water pressure, four different clay sa...

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