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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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 2018
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

8. 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

9. 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

10. 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

11. Efficient workflow for simulation of multifractured enhanced geothermal systems (EGS)

Author:
Asai, Pranay; Panja, Palash; McLennan, John; Moore, Joseph
Source:
Renewable energy 2019 v.131 pp. 763-777
ISSN:
0960-1481
Subject:
permeability,   etc   ; clean energy; environmental impact; geothermal energy; heat; hydraulic fracturing; models; prediction; temperature; water; wells;     Show all 11 Subjects
Abstract:
... The increasing demand for clean energy with minimum environmental impact motivates development of geothermal energy. Simulating a geothermal reservoir is complex and time consuming, mainly because of the systems spatial and temporal non-isothermal nature and the enormous size of the domain/reservoir. Simulations become even more complex when representing Enhanced Geothermal Systems (EGS), where we ...
DOI:
10.1016/j.renene.2018.07.074

12. Impact of ventilation systems and energy savings in a building on the mechanisms governing the indoor radon activity concentration

Author:
Collignan, Bernard; Powaga, Emilie
Source:
Journal of environmental radioactivity 2019 v.196 pp. 268-273
ISSN:
0265-931X
Subject:
permeability,   etc   ; air; buildings; energy; energy conservation; environmental factors; issues and policy; models; radioactivity; radon; ventilation systems;     Show all 11 Subjects
Abstract:
... For a given radon potential in the ground and a given building, the parameters affecting the indoor radon activity concentration (IRnAC) are indoor depressurization of a building and its air change rate. These parameters depend mainly on the building characteristics, such as airtightness, and on the nature and performances of the ventilation system. This study involves a numerical sensitivity asse ...
DOI:
10.1016/j.jenvrad.2017.11.023

13. New insights into structural evolution in carbon molecular sieve membranes during pyrolysis

Author:
Adams, Jason S.; Itta, Arun K.; Zhang, Chen; Wenz, Graham B.; Sanyal, Oishi; Koros, William J.
Source:
Carbon 2019 v.141 pp. 238-246
ISSN:
0008-6223
Subject:
permeability,   etc   ; Fourier transform infrared spectroscopy; Raman spectroscopy; carbon; cell walls; micropores; physicochemical properties; porosimetry; pyrolysis;     Show all 9 Subjects
Abstract:
... Carbon molecular sieve (CMS) membranes separate penetrants using size and shape-selective pores. In this paper we report pyrolysis of a 6FDA:BPDA-DAM polyimide precursor between 500 and 800 °C and measure gas evolution during the CMS structural development. The CMS materials were then characterized using combined transport properties, porosimetry, FTIR, Raman spectroscopy, TGA-FTIR, WAXD, and elem ...
DOI:
10.1016/j.carbon.2018.09.039

14. A method for quantifying in plane permeability of porous thin films

Author:
Rong, Guoguang; Palko, James W.; Oyarzun, Diego I.; Zhang, Chi; Hämmerle, Jacob; Asheghi, Mehdi; Goodson, Kenneth E.; Santiago, Juan G.
Source:
Journal of colloid and interface science 2018 v.530 pp. 667-674
ISSN:
0021-9797
Subject:
permeability,   etc   ; copper; mechanical properties; models; prediction;     Show all 5 Subjects
Abstract:
... The in-plane permeability of porous thin films is an important fluid mechanical property that determines wicking and pressure-driven flow behavior in such materials. This property has so far been challenging to measure directly due to the small sidewall cross-sectional area of thin films available for flow. In this work, we propose and experimentally demonstrate a novel technique for directly meas ...
DOI:
10.1016/j.jcis.2018.05.062

15. Effects of N2 and H2S binary impurities on CO2 geological storage in stratified formation – A sensitivity study

Author:
Li, Didi; Zhang, Hongcheng; Li, Yang; Xu, Wenbin; Jiang, Xi
Source:
Applied energy 2018 v.229 pp. 482-492
ISSN:
0306-2619
Subject:
permeability,   etc   ; carbon dioxide; hydrogen sulfide; trapping;     Show all 4 Subjects
Abstract:
... Impurities are unavoidable during CO2 geological storage, and they would potentially affect the plume spread as well as storage capacity and/or efficiency of CO2. The current study numerically investigated the effects of binary impurities comprising typical components N2 and H2S on CO2 geological storage in stratified formations. For a fixed total content of the binary impurities, increasing ratio ...
DOI:
10.1016/j.apenergy.2018.07.083

16. Investigation of the hydraulic properties of deep fractured rocks around underground excavations using high-pressure injection tests

Author:
Huang, Zhen; Li, Xiaozhao; Li, Shijie; Zhao, Kui; Zhang, Rui
Source:
Engineering geology 2018 v.245 pp. 180-191
ISSN:
0013-7952
Subject:
permeability,   etc   ; dewatering; engineering; groundwater; models; mutation; rocks;     Show all 7 Subjects
Abstract:
... Groundwater inrush during excavation is one of the greatest challenges in modern underground engineering. The characteristics of groundwater inrush induced by high-pressure water in fractured rocks are poorly understood, and the risk assessment of water inrush hazard associated with deep geological conditions remains to be improved. Here, we present an in situ high-pressure fluid injection experim ...
DOI:
10.1016/j.enggeo.2018.07.020

17. Designed fabrication of reduced graphene oxides/Ni hybrids for effective electromagnetic absorption and shielding

Author:
Xu, Wei; Wang, Guang-Sheng; Yin, Peng-Gang
Source:
Carbon 2018 v.139 pp. 759-767
ISSN:
0008-6223
Subject:
permeability,   etc   ; absorption; carbon; graphene oxide; nickel;     Show all 5 Subjects
Abstract:
... Reduced graphene oxide (rGO)/Ni hybrids with different mass ratio are successful synthesized in order to tune the microwave absorption together with the electromagnetic shielding performance. By properly adjusting the permittivity and permeability derived from different contents of the rGO and Ni, an rGO/Ni composite with excellent microwave absorption properties is obtained. An optimal reflection ...
DOI:
10.1016/j.carbon.2018.07.044

18. Water and salt dynamics in multilayer graphene oxide (GO) membrane: Role of lateral sheet dimensions

Author:
Gogoi, Abhijit; Konch, Tukhar Jyoti; Raidongia, Kalyan; Anki Reddy, K.
Source:
Journal of membrane science 2018 v.563 pp. 785-793
ISSN:
0376-7388
Subject:
permeability,   etc   ; artificial membranes; graphene oxide; ions; nanomaterials;     Show all 5 Subjects
Abstract:
... Dependence of salt rejection efficiency and water permeability of layered graphene oxide (GO) membranes on the lateral dimension of constituting sheets are studied through equilibrium molecular dynamic (MD) simulation and experiments. This study suggests that with increasing sheets dimension permeability of the GO membranes decreases but its selectivity increases. The velocity and permeation time ...
DOI:
10.1016/j.memsci.2018.06.031

19. Effective permeability averaging scheme to address in-plane anisotropy effects in multi-layered preforms Part A Applied science and manufacturing

Author:
Bancora, S.P.; Binetruy, C.; Advani, S.G.; Syerko, E.; Comas-Cardona, S.
Source:
Composites 2018 v.113 pp. 359-369
ISSN:
1359-835X
Subject:
permeability,   etc   ; anisotropy; arithmetics; composite materials; liquids; models;     Show all 6 Subjects
Abstract:
... In Liquid Composite Molding (LCM) processes, fabric layers are stacked in a mold which may be a few meters long and wide to build up a thickness of not more than a few millimeters. Resin is introduced to fill all the empty spaces between the fibers. As the in plane dimensions are a few orders of magnitude larger than through the thickness, flow of resin through the preform can be modeled using the ...
DOI:
10.1016/j.compositesa.2018.07.025

20. Numerical analysis on the flow–compaction behavior and the effect of interface permeability in thick composite plates during autoclave processing

Author:
Qiao, Yanliang; Zhang, Jiangtao; Zhang, Mei; Hu, Haixiao; Liu, Lisheng; Zhai, Pengcheng; Li, Shuxin
Source:
Journal of materials science 2018 v.53 no.20 pp. 14412-14422
ISSN:
0022-2461
Subject:
permeability,   etc   ; autoclaves; composite materials; models; prediction;     Show all 5 Subjects
Abstract:
... A multi-field coupled model was developed to simulate the flow–compaction behavior of thick composite laminates manufactured by the autoclave process based on Darcy’s law and the effective compaction stress theory. The model was verified by comparing the predictions with the experiment results of a thick unidirectional laminate. The results show that the resin flow and compaction of fiber bed star ...
DOI:
10.1007/s10853-018-2660-2