نتایج جستجو برای: Micro pore

تعداد نتایج: 154037  

2012
Chenchen Wang Jun Yao Kejian Wu Yongfei Yang Xin Wang

Carbonate reservoirs, accounting for majority of the world’s hydrocarbon reserves, are well known for their heterogeneity and multiscale pore characteristics. The pore sizes in carbonate rock can vary over orders of magnitudes, the geometry and topology parameters of pores at different scales have a great impact on flow properties. A relatively simple way to integrate a set of digital pore spac...

Journal: :Chemosphere 2000
K J Rockne G L Taghon D S Kosson

Soot was harvested from five combustion sources: a dodecane flame, marine and bus diesel engines, a wood stove, and an oil furnace. The soots ranged from 20% to 90% carbon by weight and molar C/H ratios from 1 to 7, the latter suggesting a highly condensed aromatic structure. Total surface areas (by nitrogen adsorption using the Brunauer Emmett Teller, BET method) ranged from 1 to 85 m2 g(-1). ...

Journal: :physical chemistry research 0
ensieh ghasemian lemraski ilam university soheila sharafinia ilam university masoud alimohammadi ilam university

this paper presents a systematic study of the surface chemistry, porous texture and adsorptive characteristics of prepared new activated carbon using persian mesquite grain. several techniques and methodologies such as, proximate analysis, n2 adsorption–desorption isotherms, scanning electron microscope (sem), fourier transform infrared spectroscopy(ft-ir), x-ray diffraction (xrd), x-ray photoe...

2002
H. Chang A. Ikram G. Vasmatzis A. Bhunia R. Bashir

This article describes the electrical characterization of live and heat-inactivated micro-organisms within microstructures. Electrophoretic movement of live and heat-inactivated Listeria innocua on interdigitated fingered electrodes confirmed the presence of negative charges on the live micro-organisms and demonstrated positive or neutral charges on the heat-inactivated micro-organisms. A micro...

2016
S. M. F. Rabbi H. Daniel P. V. Lockwood C. Macdonald L. Pereg M. Tighe B. R. Wilson I. M. Young

Aggregates play a key role in protecting soil organic carbon (SOC) from microbial decomposition. The objectives of this study were to investigate the influence of pore geometry on the organic carbon decomposition rate and bacterial diversity in both macro- (250-2000 μm) and micro-aggregates (53-250 μm) using field samples. Four sites of contrasting land use on Alfisols (i.e. native pasture, cro...

Journal: :Brazilian dental journal 2015
Gustavo De-Deus Miriam Z Scelza Prasanna Neelakantan Subash Sharma Aline de Almeida Neves Emmanuel João Nogueira Leal Silva

The aim of the present study was to compare the porosity characteristics of AH Plus Jet(tm) syringe-mix and the conventional hand-mixed AH Plus root canal sealers by three-dimensional quantitative high-resolution micro-computed tomography (micro-CT). Seven test specimens were prepared from each tested sealer by a single operator following the manufacturer's instructions and poured into pre-lubr...

Journal: :Investigative ophthalmology & visual science 2013
Bo Wang Jessica E Nevins Zach Nadler Gadi Wollstein Hiroshi Ishikawa Richard A Bilonick Larry Kagemann Ian A Sigal Ireneusz Grulkowski Jonathan J Liu Martin Kraus Chen D Lu Joachim Hornegger James G Fujimoto Joel S Schuman

PURPOSE The lamina cribrosa (LC) is a prime location of glaucomatous damage. The purpose of this study was to compare LC 3-dimensional micro-architecture between healthy and glaucomatous eyes in vivo by using optical coherence tomography (OCT). METHODS Sixty-eight eyes (19 healthy and 49 glaucomatous) from 47 subjects were scanned in a 3.5 × 3.5 × 3.64-mm volume (400 × 400 × 896 pixels) at th...

2017
Weiyao Zhu Bingbing Li Yajing Liu Hongqing Song Xiaofeng Wang

A number of experiments on fluid flow at the micro/nano-scale have demonstrated that flow velocity obviously deviates from the classical Poiseuille’s law due to the micro forces between the wall and the fluid. Based on an oil–water two-phase network simulation model, a three-dimensional pore-scale micro network model with solid–liquid interfacial effects was established. The influences of solid...

Journal: :Tissue engineering. Part A 2015
Amos Matsiko John P Gleeson Fergal J O'Brien

Recent investigations into micro-architecture of scaffolds has revealed that mean pore sizes are cell-type specific and influence cellular shape, differentiation, and extracellular matrix secretion. In this context, the overall goal of this study was to investigate whether scaffold mean pore sizes affect mesenchymal stem cell initial attachment, chondrogenic gene expression, and cartilage-like ...

1998
S. Kuiper C.J.M. van Rijn W. Nijdam M. C. Elwenspoek

Inorganic micro®ltration membranes with a pore size down to 0.1 mm have been made using laser interference lithography and silicon micro machining technology. The membranes have an extremely small ̄ow resistance due to a thickness smaller than the pore size, a high porosity and a very narrow pore size distribution. They are relatively insensible to fouling, because they have a smooth surface, s...

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