PubAg

Main content area

You searched for: Subject "permeability" Remove constraint Subject: "permeability"
Start Over

Search

14,703  Search Results

« Previous | 1 - 20 of 14,703 |
Number of results to display per page

Search Results

1. Experimental study of flow characteristics around floodplain single groyne

Author:
Mostafa, Mona M.; Ahmed, Hassan S.; Ahmed, Ashraf A.; Abdel-Raheem, Gamal A.; Ali, Nashat A.
Source:
Journal of hydro-environment research 2019 v.22 pp. 1-13
ISSN:
1570-6443
Subject:
permeability,   etc   ; floodplains; rivers;     Show all 3 Subjects
Abstract:
... This study investigated the flow around river’s floodplain single groynes. Two different compound channels with one and two symmetrical floodplains having widths of 1- and 2-times of the main channel width, respectively, were used. Both impermeable and permeable groynes with three different relative lengths (relative to the floodplain width) and having three different permeability values of 40, 60 ...
DOI:
10.1016/j.jher.2018.08.003

2. Improving the microstructure of ITZ and reducing the permeability of concrete with various water/cement ratios using nano-silica

Author:
Liu, Rui; Xiao, Huigang; Liu, Junlong; Guo, Shu; Pei, Yifei
Source:
Journal of materials science 2019 v.54 no.1 pp. 444-456
ISSN:
0022-2461
Subject:
permeability,   etc   ; cement; concrete; microstructure; nanomaterials; silica;     Show all 6 Subjects
Abstract:
... The interfacial transition zone (ITZ) between an aggregate and a cement matrix is known to be the weakest component of concrete; hence, its microstructure is the key factor determining its performance in terms of permeability. The objectives of this study are to strengthen the ITZ and reduce the permeability of concrete using nano-silica, and explore its improvement features under different water- ...
DOI:
10.1007/s10853-018-2872-5

3. In-plane permeability prediction model for non-crimp and 3D orthogonal fabrics

Author:
Karaki, M.; Hallal, A.; Younes, R.; Trochu, F.; Lafon, P.
Source:
The journal of the Textile Institute 2018 v.109 no.8 pp. 1110-1126
ISSN:
1754-2340
Subject:
permeability,   etc   ; fabrics; models; yarns;     Show all 4 Subjects
Abstract:
... Permeability reflects the ease of flow inside a composite fabric. A predictive model has been developed to estimate the unidirectional permeability in both, the warp and weft directions, for a family of non-crimped and 3D orthogonal fabrics. The model is based on an analytical solution derived from previous studies, in which the microscopic permeability of unidirectional fiber bundles is estimated ...
DOI:
10.1080/00405000.2017.1409327

4. Effects of nano-SiO2 on the permeability-related properties of cement-based composites with different water/cement ratios

Author:
Liu, Rui; Xiao, Huigang; Li, Hui; Sun, Li; Pi, Zhenyu; Waqar, GhulamQadir; Du, Tao; Yu, Lei
Source:
Journal of materials science 2018 v.53 no.7 pp. 4974-4986
ISSN:
0022-2461
Subject:
permeability,   etc   ; cement; mercury; models;     Show all 4 Subjects
Abstract:
... To find the suitable conditions under which nano-SiO₂ can exhibit a significant impermeability enhancement effect and the mechanism underlying this effect, comparisons between the permeability-related properties of a nano-SiO₂-filled cement paste and those of a reference cement paste composed of different water/cement (W/C) ratios were carried out in this research. Permeability-related properties ...
DOI:
10.1007/s10853-017-1906-8

5. Stokes Flow Through Assemblage of Non-homogeneous Porous Cylindrical Particles Using Cell Model Technique

Author:
Tiwari, Ashish; Yadav, PramodKumar; Singh, Priyanka
Source:
National Academy science letters 2018 v.41 no.1 pp. 53-57
ISSN:
0250-541X
Subject:
permeability,   etc   ; hydrodynamics; models;     Show all 3 Subjects
Abstract:
... The present paper concerns flow through assemblage of non-homogeneous porous cylindrical particles using cell model technique. All four cell model formulations used on hypothetical surface (Happel, Kuwabara, Kvashnin and Mehta-Morse/Cunningham.) and a comparison has been made among them for non-homogeneous porous region. Previously established results have been deduced as special case of our model ...
DOI:
10.1007/s40009-017-0605-y

6. Long-range stress transmission guides endothelial gap formation

Author:
Hardin, C. Corey; Chattoraj, Joyjit; Manomohan, Greeshma; Colombo, Jader; Nguyen, Trong; Tambe, Dhananjay; Fredberg, Jeffrey J.; Birukov, Konstantin; Butler, James P.; Del Gado, Emanuela; Krishnan, Ramaswamy
Source:
Biochemical and biophysical research communications 2018 v.495 no.1 pp. 749-754
ISSN:
0006-291X
Subject:
permeability,   etc   ; agonists; models;     Show all 3 Subjects
Abstract:
... In endothelial gap formation, local tractions exerted by the cell upon its basal adhesions are thought to exceed balancing tensile stresses exerted across the cell-cell junction, thus causing the junction to rupture. To test this idea, we mapped evolving tractions, intercellular stresses, and corresponding growth of paracellular gaps in response to agonist challenge. Contrary to expectation, we fo ...
DOI:
10.1016/j.bbrc.2017.11.066

7. A simple approach to evaluating leakage through thin impervious element of high embankment dams

Author:
Deng, Gang; Cao, Kui; Chen, Rui; Zhang, Xingxing; Yin, Qi; Zhou, Hao
Source:
Environmental earth sciences 2018 v.77 no.1 pp. 25
ISSN:
1866-6280
Subject:
permeability,   etc   ; dams (hydrology); seepage;     Show all 3 Subjects
Abstract:
... Internal erosion is the most common reason which induces failure of embankment dams besides overtopping. Relatively large leakage is frequently concentrated at defects of impervious element, and this will lead to eventual failure. The amount of leakage depends not only on integrity of impervious element, but also on dam height, shape of valley, shape of impervious element and water level in reserv ...
DOI:
10.1007/s12665-017-7195-3

8. Determining the long-term operational performance of pump and treat and the possibility of closure for a large TCE plume

Author:
Guo, Zhilin; Brusseau, Mark L.; Fogg, Graham E.
Source:
Journal of hazardous materials 2019 v.365 pp. 796-803
ISSN:
0304-3894
Subject:
permeability,   etc   ; aquifers; mathematical models; maximum contaminant level; remediation; Arizona;     Show all 6 Subjects
Abstract:
... The purpose of this study is to evaluate the impact of heterogeneity on the long-term performance of a large pump-and-treat (PAT) system that has been in operation for 30 years at a site located in Tucson, AZ. A 3D numerical model was developed. Three different concentrations were examined: composite concentration in the influent to the treatment plant, resident concentration in the aquifer, and c ...
DOI:
10.1016/j.jhazmat.2018.11.057

9. Roles of membrane–foulant and inter/intrafoulant species interaction forces in combined fouling of an ultrafiltration membrane

Author:
Ma, Baiwen; Wu, Gongzheng; Li, Wenjiang; Miao, Rui; Li, Xingfei; Wang, Pei
Source:
The Science of the total environment 2019 v.652 pp. 19-26
ISSN:
0048-9697
Subject:
permeability,   etc   ; bovine serum albumin; fouling; humic acids; models; silica; ultrafiltration;     Show all 7 Subjects
Abstract:
... To explore better the combined organic–inorganic fouling mechanisms of ultrafiltration (UF) membranes, SiO2 and bovine serum albumin (BSA), humic acid (HA) were chosen as model inorganic and organic foulants, respectively. Fouling experiments with single and combined foulants, corresponding fouling layer structure, and the membrane–foulant and inter/intrafoulant species interaction forces were inv ...
DOI:
10.1016/j.scitotenv.2018.10.229

10. Stereoselective synthesis of a key chiral intermediate of (S)-Rivastigmine by AKR-GDH recombinant whole cells

Author:
Xie, Panpan; Zhou, Xiaoxue; Zheng, Liangyu
Source:
Journal of biotechnology 2019 v.289 pp. 64-70
ISSN:
0168-1656
Subject:
permeability,   etc   ; alcohol oxidoreductases; catalysts; cell membranes; flow cytometry; stereoselective synthesis;     Show all 6 Subjects
Abstract:
... Herein, three aldo/ketoreductases (AKRs) were obtained and used to prepare N- ethyl-methyl-carbamic acid-3-[(1S)-hydroxy-ethyl]-phenyl ester ((S)-NEMCA-HEPE), which is a key intermediate of (S)-Rivastigmine. To avoid the usage of extra cofactors, the recombinant whole-cells containing AKRs and glucose dehydrogenase (GDH) were constructed and applied in the reduction reaction. The excellent convers ...
DOI:
10.1016/j.jbiotec.2018.11.016

11. High proton conductivity polybenzimidazole proton exchange membrane based on phosphotungstic acid-anchored nano-Kevlar fibers

Author:
Yang, Xiao-Bing; Meng, Ling-Hui; Sui, Xu-Lei; Wang, Zhen-Bo
Source:
Journal of materials science 2019 v.54 no.2 pp. 1640-1653
ISSN:
0022-2461
Subject:
permeability,   etc   ; fuel cells; humidity; methanol; phosphotungstic acid; polymers;     Show all 6 Subjects
Abstract:
... A novel polybenzimidazole (PBI) proton exchange membrane based on phosphotungstic acid (PWA)-anchored nano-Kevlar fibers (NKFs) has been successfully prepared by solution casting. Employing NKFs instead of frequently used oxide support as anchoring agent has effectively conquered the problem of the poor interface compatibility between the inorganic component and the polymer, resulting in the excel ...
DOI:
10.1007/s10853-018-2942-8

12. The characteristic release of noble gases from an underground nuclear explosion

Author:
Carrigan, Charles R.; Sun, Yunwei; Simpson, Matthew D.
Source:
Journal of environmental radioactivity 2019 v.196 pp. 91-97
ISSN:
0265-931X
Subject:
permeability,   etc   ; explosions; gases; models; monitoring; noble gases; radioactivity; troposphere;     Show all 8 Subjects
Abstract:
... Prompt release of gases at the ground surface resulting from explosively propagated vents or large operational releases has typically been considered to be the only mode of transport for detonation gases from an underground nuclear explosion (UNE) giving rise to detectable levels of radioxenon gases in downwind atmospheric samples captured at distances exceeding 100 km. Using a model for thermally ...
DOI:
10.1016/j.jenvrad.2018.10.015

13. Can we face different types of storms under the same umbrella? Efficiency and consistency of connectivity umbrellas across different patchy landscape patterns

Author:
Diniz, Milena F.; Machado, Ricardo B.; Bispo, Arthur A.; De M. Júnior, Paulo
Source:
Landscape ecology 2018 v.33 no.11 pp. 1911-1923
ISSN:
0921-2973
Subject:
permeability,   etc   ; habitat connectivity; landscapes; storms;     Show all 4 Subjects
Abstract:
... CONTEXT: The umbrella approach applied to landscape connectivity is based on the principle that the conservation or restoration of the dispersal habitats for some species also can facilitate the movement of others. Species traits alone do not seem to be enough to identify good connectivity umbrella species, showing the need to investigate the influence of additional factors on this property. OBJEC ...
DOI:
10.1007/s10980-018-0720-2

14. Cause and effects of hyperskin features on carbon molecular sieve (CMS) membranes

Author:
Sanyal, Oishi; Hicks, Stephanie T.; Bhuwania, Nitesh; Hays, Samuel; Kamath, Manjeshwar G.; Karwa, Shweta; Swaidan, Raja; Koros, William J.
Source:
Journal of membrane science 2018 v.551 pp. 113-122
ISSN:
0376-7388
Subject:
permeability,   etc   ; artificial membranes; carbon; sieving;     Show all 4 Subjects
Abstract:
... This article considers a previously overlooked feature in carbon molecular sieve (CMS) membranes that we term a “hyperskin” present at the outermost region of dense CMS selective layers. Such a feature with much lower permeability, but similar selectivity compared to the bulk of the skin, reduces CMS hollow fiber permeance below that predicted from corresponding dense films. Effects of the hypersk ...
DOI:
10.1016/j.memsci.2018.01.021

15. A computational geometry approach to pore network construction for granular packings

Author:
van der Linden, Joost H.; Sufian, Adnan; Narsilio, Guillermo A.; Russell, Adrian R.; Tordesillas, Antoinette
Source:
Computers & geosciences 2018 v.112 pp. 133-143
ISSN:
0098-3004
Subject:
permeability,   etc   ; algorithms; computers; engineering; throat;     Show all 5 Subjects
Abstract:
... Pore network construction provides the ability to characterize and study the pore space of inhomogeneous and geometrically complex granular media in a range of scientific and engineering applications. Various approaches to the construction have been proposed, however subtle implementational details are frequently omitted, open access to source code is limited, and few studies compare multiple algo ...
DOI:
10.1016/j.cageo.2017.12.004

16. Reconsidering what enclosure and exclosure mean in restoration ecology

Author:
Yirdaw, Eshetu; Monge, Adrian
Source:
Restoration ecology 2018 v.26 no.1 pp. 45-47
ISSN:
1061-2971
Subject:
permeability,   etc   ; ecological restoration; ecosystems; livelihood;     Show all 4 Subjects
Abstract:
... There is ambiguity in the use of the terms “enclosure” and “exclosure” in describing the passive method used for the restoration of degraded ecosystems. We argue that in the context of ecological restoration, the term enclosure is generally more appropriate to use than exclosure. Unlike exclosure, the term enclosure focuses on the degraded area to be restored, does not exclude selective permeabili ...
DOI:
10.1111/rec.12569

17. Effects of early enteral bovine colostrum supplementation on intestinal permeability in critically ill patients: A randomized, double-blind, placebo-controlled study

Author:
Eslamian, Ghazaleh; Ardehali, Seyed Hossein; Baghestani, Ahmad-Reza; Vahdat Shariatpanahi, Zahra
Source:
Nutrition 2019 v.60 pp. 106-111
ISSN:
0899-9007
Subject:
permeability,   etc   ; adults; cow colostrum; diarrhea; endotoxins; intestines; mechanism of action; patients; placebos;     Show all 9 Subjects
Abstract:
... In this study we sought to investigate the effect of early enteral bovine colostrum supplementation on intestinal permeability in intensive care unit (ICU)–hospitalized patients.A total of 70 ICU-hospitalized adult patients were randomly assigned to receive a bovine colostrum supplement or placebo according to the stratified blocked randomization by age and admission category. Plasma endotoxin and ...
DOI:
10.1016/j.nut.2018.10.013

18. MIL-PVDF blend ultrafiltration membranes with ultrahigh MOF loading for simultaneous adsorption and catalytic oxidation of methylene blue

Author:
Ren, Yi; Li, Ting; Zhang, Weiming; Wang, Shu; Shi, Mengqi; Shan, Chao; Zhang, Wenbin; Guan, Xiaohong; Lv, Lu; Hua, Ming; Pan, Bingcai
Source:
Journal of hazardous materials 2019 v.365 pp. 312-321
ISSN:
0304-3894
Subject:
permeability,   etc   ; acetone; adsorption; decontamination; iron; methylene blue; mixing; oxidation; porosity; separation; ultrafiltration; wastewater;     Show all 12 Subjects
Abstract:
... Multifunctional ultrafiltration membranes need to be further developed with ultrafiltration performance and high multifunctional decontamination efficiency. Here, the MIL-PVDF multifunctional ultrafiltration membrane with ultrahigh MIL loading was demonstrated by a new blending method of predispersion in acetone and thermally induced phase separation. Due to the improved dispersity and restriction ...
DOI:
10.1016/j.jhazmat.2018.11.013

19. Ratiometric fluorescent probe based on ESIPT for the highly selective detection of cysteine in living cells

Author:
Li, Xinran; Ma, Hong; Qian, Jing; Cao, Ting; Teng, Zhidong; Iqbal, Kanwal; Qin, Wenwu; Guo, Huichen
Source:
Talanta 2019 v.194 pp. 717-722
ISSN:
0039-9140
Subject:
permeability,   etc   ; aqueous solutions; cysteine; cytotoxicity; fluorescence; fluorescent dyes; glutathione; homocysteine; image analysis;     Show all 9 Subjects
Abstract:
... A new simple and facile fluorescent ratiometric probe (probe 1) has been designed for the detection of cysteine (Cys). Probe 1 as the fluorophore contains a typical excited-state intramolecular proton transfer (ESIPT) dye. In probe 1 to restore the ESIPT process, the group of acrylate which acts as the recognition unit can block the ESIPT process and can be selectively achieved by Cys, which makes ...
DOI:
10.1016/j.talanta.2018.10.095

20. External factors and nanoparticles effect on water vapor permeability of pectin-based films

Author:
Spatafora Salazar, Aldo Stefano; Sáenz Cavazos, Paola Alejandra; Mújica Paz, Hugo; Valdez Fragoso, Aurora
Source:
Journal of food engineering 2019 v.245 pp. 73-79
ISSN:
0260-8774
Subject:
permeability,   etc   ; activation energy; diffusivity; hydrophilicity; mango peels; nanoparticles; pectins; relative humidity; silica; solubility; temperature; water vapor;     Show all 12 Subjects
Abstract:
... Permeation of water vapor through hydrophilic films is a rather complicated phenomenon. Water vapor permeability (WVP) of pectin films containing silicon dioxide nanoparticles was investigated under different temperature and relative humidity (RH) conditions, using orange and mango peel as pectin sources. No significant effect of the pectin source on WVP was observed. It was found that WVP increas ...
DOI:
10.1016/j.jfoodeng.2018.09.002