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Relevant bibliographies by topics / Poren

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Academic literature on the topic 'Poren'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Poren"

1

Churaev, N. V., Μ. J. Setzer, О. Wowra, and Μ. Reick. "Electrolytes in narrow pores / Electrolyten in engen Poren." Restoration of Buildings and Monuments 6, no. 1 (February 1, 2000): 87–102. http://dx.doi.org/10.1515/rbm-2000-5449.

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Abstract Mean electrolyte concentration Cm in narrow charged pores decreases as a result of repulsion of co-ions from charged walls. The theory of electrical double layers (EDL) was used for calculation of this effect in dependence on surface potential values Φ1 and concentration C0 of bulk electrolyte solutions. The calculations were limited to the case of 1-1 electrolytes and low values of surface potentials Φ1 when simple analytical solutions may be used. Mean concentration of chloride ions and neutral solution in narrow negatively charged slit pores of different thickness h was calculated in dependence on Φ1 and Debye radius values. It was shown that the effect is more pronounced in narrow pores at relatively high absolute values of surface potentials and at low concentration of a bulk solution. In narrow hydrophilic pores, a decrease in mean electrolyte concentration results from the effect of dielectric exclusion caused by decreasing values of dielectric constant of water ef. The calculations were performed using Born equation that relates the self-energy of ions W with the 8f values and ion radii. Comparing the results obtained with measured values of rejection coefficients of electrolyte solutions in reverse osmosis membranes, the dependence of £f values on pore sizes was calculated. Repulsive forces arising in narrow pores as a result of overlapping of EDL are calculated in dependence on slit thickness, bulk solution concentration and surface potentials in the framework of the theory of electrostatic component of disjoining pressure. In the case of hydrophilic silica systems molecular attraction forces and repulsive structural forces were also taken into account. The arising structural forces are caused by overlapping of boundary layers of water with modified structure

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Kaskel, Stefan. "Poren per Baukasten." Nachrichten aus der Chemie 53, no. 4 (April 2005): 394–99. http://dx.doi.org/10.1002/nadc.20050530407.

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Vilgis, Thomas. "Poren, Fleisch und Feuchtigkeit." Physik in unserer Zeit 40, no. 5 (September 2009): 266. http://dx.doi.org/10.1002/piuz.200990095.

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Fischer, Michael, Michael Sartor, and Michael Fröba. "Kleine Poren - große Wirkung." Nachrichten aus der Chemie 58, no. 10 (October 2010): 1003–7. http://dx.doi.org/10.1002/nadc.201063113.

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Harbich, K., K. Meyer, A. Lange, and M. Hentschel. "Poren in Keramik bestimmen." Materials Testing 36, no. 6 (June 1, 1994): 234–39. http://dx.doi.org/10.1515/mt-1994-360607.

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Heinbuch, Uwe, and Johann Fischer. "Dynamik von Gasmolekülen in Poren." Chemie Ingenieur Technik 60, no. 8 (August 1988): 636–38. http://dx.doi.org/10.1002/cite.330600813.

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Binder, Wolfgang H. "Polymerinduzierte transiente Poren in Lipidmembranen." Angewandte Chemie 120, no. 17 (April 14, 2008): 3136–39. http://dx.doi.org/10.1002/ange.200800269.

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Kollmann, F. "Poren und Porigkeit in Hölzern." Holz als Roh- und Werkstoff 45, no. 1 (January 1987): 1–9. http://dx.doi.org/10.1007/bf02612035.

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Harbich, Karl-Wolfram, Torsten Rabe, Udo Mücke, and Axel Lange. "Fachaufsätze. Charakterisieren von Poren in Sinterglaskeramik." Materials Testing 36, no. 7-8 (July 1, 1994): 303–5. http://dx.doi.org/10.1515/mt-1994-367-822.

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Simon, Martin. "Nativ ist gut, Kontrastmittel besser … durch alle Poren." Der Radiologe 47, no. 12 (November 21, 2007): 1070–71. http://dx.doi.org/10.1007/s00117-007-1594-5.

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Dissertations / Theses on the topic "Poren"

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Gebert, Jörg-Martin [Verfasser]. "Intrinsische Risse und Poren in Kohlenstoff Verbundwerkstoffen / Jörg-Martin Gebert." Aachen : Shaker, 2011. http://d-nb.info/1098041712/34.

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Berger, Sven. "Expression der Poren bildenden Hämolysine Listeriolysin und TlyA in Mycobacterium smegmatis." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964920824.

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Kuder, Tristan Anselm [Verfasser], and Peter [Akademischer Betreuer] Bachert. "Diffusions-Poren-Bildgebung mittels kernmagnetischer Resonanz / Tristan Anselm Kuder ; Betreuer: Peter Bachert." Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1177810964/34.

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Fudickar, Werner. "Synkinese von gemischten Lipid-Porphyrin-Monoschichten auf Gold mit formstabilen 2-nm-Poren." [S.l. : s.n.], 2001. http://www.diss.fu-berlin.de/2001/54/index.html.

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Schramm, Patrick. "Elektrophysiologische Charakterisierung und pharmakologische Beeinflussung von durch Pneumolysin aus Streptococcus pneumoniae gebildeten Poren." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974395668.

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Schulze, Christina [Verfasser], and Petra [Gutachter] Dietrich. "Struktur-Funktionsanalyse von AtTPC1, einem Zwei-Poren Kationenkanal aus Arabidopsis thaliana / Christina Schulze ; Gutachter: Petra Dietrich." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2016. http://d-nb.info/1120120586/34.

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Mathwig, Klaus [Verfasser], Ulrich [Akademischer Betreuer] Gösele, Ralf B. [Akademischer Betreuer] Wehrspohn, and Christian G. [Akademischer Betreuer] Hübner. "Transport von Teilchen in asymmetrisch modulierten Poren / Klaus Mathwig. Betreuer: Ulrich Gösele ; Ralf B. Wehrspohn ; Christian G. Hübner." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2010. http://d-nb.info/1024937518/34.

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Liebig, Wilfried V. [Verfasser], and Wolfgang [Akademischer Betreuer] Hintze. "Mikrostrukturelle Betrachtung des Einflusses von Poren auf die mechanischen Eigenschaften von faserverstärkten Kunststoffen / Wilfried Liebig ; Betreuer: Wolfgang Hintze." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2019. http://d-nb.info/1180493931/34.

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Schludi, Verena Maria [Verfasser], and Christian [Akademischer Betreuer] Wahl-Schott. "Physiologische Funktion und pathophysiologische Relevanz des Zwei-Poren-Kanals Typ 2 (TPC2) / Verena Maria Schludi ; Betreuer: Christian Wahl-Schott." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2018. http://d-nb.info/1179076001/34.

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Wark, Michael. "Farbstoffmoleküle und Halbleiter-Nanopartikel in den Poren von Molekularsieben Einfluss von Wirt-Gast- und Gast-Gast-Beziehungen auf die optischen Eigenschaften /." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=982611293.

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Books on the topic "Poren"

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Durch 1000 Kanäle und Poren--: Die Verbreitung der Psychoanalyse von ihren Anfängen bis zur Gegenwart. Frankfurt am Main: Lang, 2009.

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Serrier, Thomas. Provinz Posen, Ostmark, Wielkopolska: Eine Grenzregion zwischen Deutschen und Polen, 1848-1914. Marburg: Herder-Institut, 2005.

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Pored. Niš: Prosveta, 1997.

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Polkowski, Andreas. Polen. Hamburg: Verlag Weltarchiv, 1991.

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Pomen. Beograd: BIGZ, 1996.

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Castañeda, Juan Pedro. Polen. Islas Canarias: Viceconsejería de Cultura y Deportes, Gobierno de Canarias, 1993.

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Handel und Gewerbe im Nationalitätenkampf: Studien zur Wirtschaftsgesinnung der Polen in der Provinz Posen (1871-1914). Göttingen: Vandenhoeck & Ruprecht, 1986.

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Kryptonim Posen. Poznań: Media Rodzina, 2011.

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Bien, Ania. Hotel Polen. [s.l.]: [s.n.], 1987.

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Reith, Thomas. Wirtschaftspartner Polen. 3rd ed. Bonn: Economica Verlag, 1994.

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Book chapters on the topic "Poren"

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Pleßow, Alexander, and Hartmut Heinrichs. "Einfluß der Pyritoxidation auf das Lösungsverhalten von Spurenelementen in Sicker-, Poren- und Grundwässern einer Abraumhalde (Zwenkau/Sachsen)." In Bergbau und Umwelt, 41–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-57228-9_3.

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Matthes, Claudia-Yvette. "Polen." In Verbände und Interessengruppen in den Ländern der Europäischen Union, 551–82. Wiesbaden: VS Verlag für Sozialwissenschaften, 2012. http://dx.doi.org/10.1007/978-3-531-19183-6_19.

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Krohn, Tobias. "Polen." In Die Genese von Wahlsystemen in Transitionsprozessen, 205–51. Wiesbaden: VS Verlag für Sozialwissenschaften, 2003. http://dx.doi.org/10.1007/978-3-663-09710-5_6.

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Brauneck, Manfred. "Polen." In Die Welt Als Bühne, 722–61. Stuttgart: J.B. Metzler, 2007. http://dx.doi.org/10.1007/978-3-476-00029-3_19.

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Ropuszyńska-Surma, Edyta, Magdalena Węglarz, and Zdzisław Szalbierz. "Polen." In Leitungsgebundene Energieversorgung in Mittel- und Osteuropa, 1–26. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-11587-6_1.

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Matzen, Christiane. "Polen." In Medien von A biz Z, 276–80. Wiesbaden: VS Verlag für Sozialwissenschaften, 2006. http://dx.doi.org/10.1007/978-3-531-90261-6_115.

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Ziemer, Klaus. "Polen." In Vom Ostblock zur EU, 137–64. Göttingen: Vandenhoeck & Ruprecht, 2013. http://dx.doi.org/10.13109/9783666369605.137.

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Walter, Julia. "Polen." In Verschwörungen, 73–79. Göttingen: Vandenhoeck & Ruprecht, 2016. http://dx.doi.org/10.13109/9783666800139.73.

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Gooch, Jan W. "Porin." In Encyclopedic Dictionary of Polymers, 916. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_14542.

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Mazurkiewicz, Piotr, and Cyprian Rogowski. "Polen." In Kirche und Erziehung in Europa, 225–47. Wiesbaden: VS Verlag für Sozialwissenschaften, 2005. http://dx.doi.org/10.1007/978-3-322-80791-5_10.

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Conference papers on the topic "Poren"

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Ispir, Ali Can, Tugce Karatas, Eren Dikec, and Seyhan Onbasioglu. "Experimental Investigation of Effect of Pore Diameter on Nucleate Boiling Heat Transfer in Reentrant Tunnel Structured Surfaces." In ASME 2017 15th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icnmm2017-5533.

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This paper focuses on experimental studies of boiling heat transfer on surfaces with reentrant tunnels and pores. Three structured surface which have same tunnel width and height but different pore diameter, have been developed for enhancement boiling heat transfer. The experimental studies were carried out for the structured surfaces using distilled water at atmospheric pressure. The narrow reentrant tunnels are parallel to each other and have 3 mm width, 4 mm height. A number of pores whose diameter 1.5 and 2.0 mm were machined on lateral surfaces of tunnels. The surfaces were termed according to their geometric specifications as 3.0W-30-30, 1.5D-3.0W-30-30, 2.0D-3.0W-30-30. D and W capitals represent pore diameter and tunnel width, respectively. 30-30 part of name shows the dimension of square surface. The tunnels were used to increase area of heat transfer and active nucleation sites of vapor bubbles. In addition, sufficient amount of liquid must be supplied and vapor bubbles should be released fast from the boiling surface before they merge on the surfaces under conditions especially with high heat fluxes. Therefore, it was considered that pore structures would help for fluid transition hence the bubble frequency will increase. Pool boiling experiments were held to determine the performance of surfaces in different range of heat fluxes. Besides, high-speed visualization studies were conducted with high speed camera to observe behavior of nucleation of vapor bubbles. Amongst different geometry sizes the surface which has 1.5 mm of pore diameter (1.5D-3.0W-30-30) demonstrated the best nucleate boiling performance at high heat fluxes. However, the pored ones without pores has higher augmentation than pored structures at low heat fluxes. Thus, it is concluded that pored structures caused active nucleation sites to decrease under low heat fluxes.

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Anderson, Gary A., Anil Kommareddy, Zhengrong Gu, Joanne Puetz Anderson, and Stephen P. Gent. "Experimental Determination of Pressure Loss Through Porous Membranes." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6460.

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Air with carbon dioxide is bubbled through Photobioreactors (PBRs) to add carbon dioxide to the reactor medium, remove oxygen, and mix the medium. Most PBR systems use various types of spargers/diffusers that consist of straight or curved tubes with perforation in them to inject air into the PBR reactor volume. A possible novel approach to introducing air into the PBR reactor volume is to use a plenum under the PBR reactor volume in conjunction with a porous membrane that separates the air in the plenum from the liquid medium in the reactor volume. The resistance offered by the porous membrane and the liquid in the reactor volume to air flow needs to be established so that power requirements to provide the desired air flow through the PBR can be determined. Four types of porous membranes were tested: 1)Sintered High Density Polyethylene HDPE 1.59 mm thick with 15–45 μm pore size, 2) Sintered HDPE 0.79 mm thick with 20μm pore size, 3) Genpore black plastic sheet with 45 μm pore size, and 4) Porex 7896 HDPE with pore size of 35 μm). Specimens were tested in a 76.2 mm inside diameter reactor with a depth of 304.8mm and a 76.2 mm plenum depth. Water was used as the reactor medium and the depth was varied between 0 and 228.6 mm. Results showed that the Porex 7896 membrane had little resistance to air flow when the water depth was 0.0mm (1–22 Pa), 1–200 Pa for the Genpore plastic sheet, 1200–1400Pa for the Porex with 20μm pores, and 1100–2500 Pa for the Porex with the 15–45 μm pore sizes for superficial air velocities between 0.00345 m/s to 0.0242 m/s. Water depth was then increased to 228.6 mm in 25.4 mm increments and tested with the same air flow rates. The addition of water significantly increased the resistance to air flow for all membranes (highest being 4200 Pa). Least square correlations for the membranes using water depth and superficial air velocity indicate that resistance to air flow of the membranes was linear with superficial velocity but parabolic with water depth.

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Razavi, Reza, and Stephen A. Sarles. "Modeling and Experiments on Liquid-Infused, Mechanically Activated Porous Materials." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9046.

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The goal of our research is to develop new understanding regarding the design and fabrication of mechanically activated liquid-infused porous films. Our unique approach is to consider a thin, elastic material that features well-defined pores, which are plugged with an infusing liquid that preferentially wets to the walls of the pores. By tuning the geometry of the pores, liquid-filled pores can be rearranged into a configuration that creates an open pore by applying stretch to the solid material, and they close (i.e. heal) again when the stretch is removed. Impregnating the pores with liquid seeks to avoid limitations that prevent complete pore closure and allows for tailoring of the pore geometry to drive liquid redistribution in the pore. The specific objective of this research is to study the effects of pore geometry and liquid wetting for creating fully reversible, stretch-activated pores. Our approach is both computational and experimental: Surface Evolver software is utilized to predict minimal energy wetting states of liquid in various pore shapes, and experiments on porous elastomers infused with either water or mineral oil allow measurements of stretch-induced changes in wetting properties and porosity. Both modeling and experiments demonstrate that a tear-shaped pore, which consists of a circular pore that features a taper extending in a radial direction, can enable reversible opening and closing of the pore via liquid redistribution. Our results indicate that infusing liquids with lower surface tensions and lower contact angles on walls of the pore exhibit better reversibility during the application of stretch.

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Zhang, Shanshan, Sabina Chertmanova, and Kevin Chou. "Surrogate Pore Generations in L-PBF Ti64 and Effects on Mechanical Behavior." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8470.

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Abstract In this study, surrogate pores were designed and generated at specific locations inside tensile specimens fabricated by laser powder bed fusion (L-PBF) processing and further evaluated in porosity characteristics and mechanical properties. The objectives are to demonstrate the feasibility of pore generation and to characterize the pores and examine the effect from various process conditions. The pore-generated specimens were fabricated in an L-PBF system using Ti-6Al-4V (Ti64) powder. Overall, specimens were made using default settings. But, during processing the middle section of the tensile specimens, single track exposures were applied to induce keyhole pores with different energy density levels as well as different scan track numbers and layers. An X-ray computed tomography system was utilized to measure and analyze surrogate pores in the fabricated specimens in pore counts, volumes and sphericity related to process conditions. The results showed that, as expected, pore formation increases with the laser energy density applied and the number of tracks and layers exposed, although individual tracks exhibit a high variability. Specimens evaluated by tensile testing and fractography show that surrogate pores produced in this study so far influence only the ductility of the specimens noticeably, but not Young’s modulus, nor the yield and tensile strengths.

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Shin, Yun-Ha, Hong-Gyu Jeon, Jeong-Kuk Son, Ji-Man Kim, Tae-Sung Kim, and Young Ze Lee. "Frictional Characteristics of Mesoporous SiO2 Thin Film Formed by Sol-Gel and Self-Assembly Method." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44046.

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Frictional characteristics of mesoporous SiO2 thin films were evaluated with different pore sizes. The films were manufactured by sol-gel and self-assembly methods to have a porous structure. The pores on the surface may play as the outlet of wear particle and the storage of lubricant so that the surface interactions could be improved. The pores were exposed on the surface by chemical mechanical polishing (CMP) or plasma-etching after forming the porous films. The ball-on-disk tests with mesoporous SiO2 thin films on glass specimen were conducted at sliding speed of 15rpm and a load of 0.26N. The results show considerable dependency of friction on pore size of mesoporous SiO2 thin films. The friction coefficient decreased as increasing the pore size. CMP process was very useful to expose the pores on the surface.

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Giorges, Aklilu T. G., and John A. Pierson. "Modeling and CFD Simulation of Membrane Flow Process." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53530.

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In the processing industries several membrane technologies are used to separate and concentrate various fluid stream where the concentrate or/filtrate has high value products. Nevertheless, pore blocking is one of the major factors determining the applicability, efficiency and performance of the membrane filtration and separation system. Inside and outside membrane pore blockage leads to concentration polarization and cake buildup that reduces the flux rate and increases losses in system efficiency. Several experimental and theoretical works exist that describe the pore flow and blocking process. However, a limited amount of published work integrates the pore blocking with computational fluid dynamics (CFD). The change in the fluid stream and membrane characteristics during the process are the major challenges in CFD modeling. This paper presents the initial simulations of two-dimensional CFD models that directly model the actual micro pore flow and the porous medium flow (Darcy flow). Various pressure and pore sizes (porosity and permeability) were simulated. For the first model, pore flow model, simplified two-dimensional micro pores were modeled and the continuity and Navier-Stokes equations were solved in all regions including pores. Appling various inlet pressures, the velocity and pressure in all fluid regions are simulated. In second model, the membrane region is modeled as porous medium and the flow field is simulated by using porous medium characteristics. The porous medium characteristics, porosity and permeability, were estimated from pore flow average outlet velocity. The result indicates that both models with equivalent values can be used to predict the overall flow fields. However, both models have to overcome challenges to be widely used. With the direct pore flow (pores flow) simulation, mesh generation becomes a challenge since the membrane pores are very small as compared to the inlet and outlet regions. The pore flow simulation results indicate that CFD can be used to understand the membrane flow characteristics and fluid mechanics. It also can be used to design and / or select a membrane system. For the simulation of membrane as porous medium, the detail of flow through the porous medium including the inlet and outlet effects becomes obscured. However, the system overall performance can be simulated using CFD model for porous medium.

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Tomita, Noriko, Kazuyo Abe, and Makoto Ohta. "Quantitative Analysis of Subunit Mismatch Arrangement in Staphylococcal Gamma-Hemolysin Heteroheptameric Transmembrane Pore." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63645.

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Pore-forming cytolytic proteins distributed in a wide variety of eukaryotic and prokaryotic organisms have been intensively studied in terms of pathophysiological functions and molecular architecture of transmembrane pores. These proteins are also being developed for various analytical applications such as detector of proteins and DNA by engineering the structure of the pore. Staphylococcal gamma-hemolysin (Hlg), a pore-forming protein, which consists of two separate proteins, LukF and Hlg2, has potential to be a useful tool as a multifunctional biosensor. However, the fine structure of the Hlg pore has not been clarified. Our previous studies revealed that LukF and Hlg2 assemble alternately on the membrane in a molar ratio of 3:4 and 4:3 and form cylindrical heteroheptameric transmembrane pores. In the present study, we conducted quantitative analysis of the subunit arrangement of the pore by using two-dimensional (2-D) image analysis based on high-resolution transmission electron microscopy (TEM) images. Results of this study suggest a new aspect of the characteristic structure in two-component pore-forming protein and can contribute to the engineering of the Hlg pore.

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Wang, W. B., X. H. Yang, Q. C. Zhang, and T. J. Lu. "Solidification Analysis of Density-Graded Closed-Cell Metallic Foam Under Constant Temperature Boundary Condition." In ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6719.

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In the industrial fabrication processes of density-graded closed-cell metallic foams, it is of great importance to control the solidification immediately after foams are formed so as to obtain the final products with well distributed density-graded pores and less defects. This paper presented an analytical work aiming to predict the solidification front of density-graded metallic foam under constant temperature boundary condition. Numerical simulations based on ideal density-graded circular pores demonstrated good agreement with the analytical solutions. The 2D porous morphology of a real density-graded aluminum foam was further reconstructed with microCT, on the basis of which the propagation of solidification front inside this real density-graded foam was numerically investigated. An equivalent shape factor for this real foam was calculated to provide an insight for the influence of different pore shapes on solidification. Compared with other pores, the solidification speed of elliptical pores (a common pore shape in real foams) is moderate, i.e., slower than circular pores but quicker than triangular pores for same porosity.

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Gururaja, Suhasini, and Abhilash Nagaraja. "Effect of Microporosity on Damage Initiation in Ceramic Matrix Composites." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91908.

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Abstract Ceramic matrix composites (CMC) are a subclass of composite materials consisting of reinforced ceramics. They retain the advantages of ceramics such as lower density and better refractory properties but exhibit better damage tolerance compared to monolithic ceramics. This combination of properties make CMCs an ideal candidate for use in high temperature sections of gas turbines. However, modeling the damage mechanisms in CMCs is complex due to the heterogeneous microstructure and the presence of processing induced defects such as matrix porosity. The effect of matrix pore location and orientation on damage initiation in CMCs is of interest in the present work. CMCs fabricated by various fabrication processes exhibit matrix pores at different length scales. Microporosities exist within fiber bundles in CMCs have a significant effect on microscale damage initiation and forms the focus of the current study. In a previous work by the authors, a two step numerical homogenization approach has been developed to model statistical distribution of matrix pores and to obtain the effective mechanical properties of CMCs in the presence of matrix porosity. A variation of that approach has been adopted to model matrix pores and investigate the severity of pores with respect to their location and orientation. CMC microstructure at the microscale has been modeled as a repeating unit cell (RUC) consisting of fiber, interphase and matrix. Ellipsoidal pores are modeled in the matrix with pore distance from the interphase-matrix interface and pore orientation with respect to the loading direction as parameters. Periodic boundary conditions (PBCs) are specified on the RUC by means of constraint equations. The effect of the pore on the local stress fields and its contribution to matrix damage is studied.

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Karimi, Somayeh, and Hossein Kazemi. "Characterizing Pores and Pore-Scale Flow Properties in Middle Bakken Cores." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/187076-ms.

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Reports on the topic "Poren"

1

Ternan, M. Large pore alumina. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/304490.

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2

Simons, Girard A. Extension of the Pore Tree" Model to Describe Pore Interconnectivity.". Fort Belvoir, VA: Defense Technical Information Center, October 1994. http://dx.doi.org/10.21236/ada290366.

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3

Liu, Ding, and Douglas Windslow. Pore Structure of Concrete. West Lafayette, IN: Purdue University, 1986. http://dx.doi.org/10.5703/1288284314114.

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4

Bayley, Hagan, and Sean Conlan. Genetically Engineered Pores Sensing Metal Ions. Fort Belvoir, VA: Defense Technical Information Center, October 2000. http://dx.doi.org/10.21236/ada383413.

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Ternan, M. The diffusion of liquids in pores. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/302633.

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6

Ewing, R. Final Report for Subcontract B541028, Pore-Scale Modeling to Support "Pore Connectivity" Research Work. Office of Scientific and Technical Information (OSTI), February 2009. http://dx.doi.org/10.2172/948963.

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Bayley, Hagan. Genetically Engineered Pores for Sensing Metal Ions. Fort Belvoir, VA: Defense Technical Information Center, September 2000. http://dx.doi.org/10.21236/ada400504.

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Teufel, L. W. Influence of pore pressure and production-induced changes in pore pressure on in situ stress. Office of Scientific and Technical Information (OSTI), February 1996. http://dx.doi.org/10.2172/208315.

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Hess, Nancy J., Martinus Oostrom, Michael A. Celia, Markus Hilpert, Qinjun Kang, Laura J. Pyrak-Nolte, Timothy D. Scheibe, et al. EMSL Pore Scale Modeling Challenge/Workshop. Office of Scientific and Technical Information (OSTI), August 2011. http://dx.doi.org/10.2172/1034236.

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Chojnicki, Kirsten. Measurements of pore-scale flow through apertures. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1395436.

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