نتایج جستجو برای: pore system

تعداد نتایج: 2266274  

2016
Fuyong Yan De-Hua Han

Although there is no assumption of pore geometry in derivation of Gassmann’s equation, the pore geometry is in close relation with hygroscopic water content and pore fluid communication between the micropores and the macropores. The hygroscopic water content in common reservoir rocks is small, and its effect on elastic properties is ignored in the Gassmann theory. However, the volume of hygrosc...

Journal: :Chemical Society reviews 2013
Lauren Bayne Rein V Ulijn Peter J Halling

Porous materials are widely employed as supports in the immobilisation of enzymes. Traditionally macroporous materials with pore diameters >50 nm were believed to be the most suitable support material, ensuring no spatial restrictions upon enzyme molecules entering such large pores. In recent years however, there has been growing emphasis in the use of mesoporous supports with pore diameters ra...

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...

2007
N. Panté

In interphase eukaryotic cells, the nucleus is separated from the cytoplasm by a double nuclear membrane system called the nuclear envelope. The nuclear envelope enables the two cell compartments to have their distinct composition, and separates the genetic machinery from protein synthesis. Molecular exchange between the nucleus and the cytoplasm, however, is essential for keeping eukaryotic ce...

Journal: :iran agricultural research 2012
b. ghahraman s. omidi a. khoshnood yazdi

measurement of soil saturated hydraulic conductivity, ks, is normally affected by flow patterns such as macro pore; however, most current techniques do  not differentiate flow types, causing major problems in describing water and chemical flows within the soil matrix. this study compares eight models for scaling ks and predicted matrix and macro pore ks, using a database composed of 50 datasets...

2014
Timothy D. Scheibe Xiaofan Yang Karen Schuchardt Khushbu Agarwal Alexandre Tartakovsky

Continuum-scale models have long been used to study subsurface flow, transport, and reactions but lack the ability to resolve processes that are governed by pore-scale mixing. Recently, porescale models, which explicitly resolve individual pores and soil grains, have been developed to more accurately model pore-scale phenomena, particularly reaction processes that are controlled by local mixing...

ژورنال: علوم آب و خاک 2022

Accurate prediction of pore water pressure in the body of earth dams during construction with accurate methods is one of the most important components in managing the stability of earth dams. The main objective of this research is to develop hybrid models based on fuzzy neural inference systems and meta-heuristic optimization algorithms. In this regard, the fuzzy neural inference system and opt...

2012
Gennady Yu. Gor Christopher J. Rasmussen Alexander V. Neimark

The mechanisms of hysteretic phase transformations in fluids confined to porous bodies depend on the size and shape of pores, as well as their connectivity. We present a Monte Carlo simulation study of capillary condensation and evaporation cycles in the course of Lennard-Jones fluid adsorption in the system of overlapping spherical pores. This model system mimics pore shape and connectivity in...

Journal: :Current opinion in cell biology 2017
Ryo Hayama Michael P Rout Javier Fernandez-Martinez

The study of the nuclear pore complex (NPC) is a fascinating endeavor, as it not only implies uncovering the 'engineering marvel' of its architecture and function, but also provides a key window into a significant evolutionary event: the origin of the eukaryotic cell. The combined efforts of many groups in the field, with the help of novel methodologies and new model organisms, are facilitating...

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