Готові списки джерел за темами / Dense and porous structure

Добірка наукової літератури з теми "Dense and porous structure"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Dense and porous structure"

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Zhang, Fa Ming, Jiang Chang, Jian Xi Lu та Kai Li Lin. "Fabrication and Mechanical Properties of Dense/Porous β-Tricalcium Phosphate Bioceramics". Key Engineering Materials 330-332 (лютий 2007): 907–10. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.907.

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Attempt to increase the mechanical properties of porous bioceramics, a dense/porous structured β-TCP bioceramics that mimic the characteristics of nature bone were fabricated. Experimental results show that the dense/porous structured β-TCP bioceramics demonstrated excellent mechanical properties with compressive strength up to 74 MPa and elastic modulus up to 960 MPa, which could be tailored by the dense/porous cross-sectional area ratio obeying the rule of exponential growth. The interface between the dense and porous bioceramics is connected compactly and tightly with some micropores distributed in the matrix of both porous and dense counterparts. The dense/porous structure of β-TCP bioceramics may provide an effective way to increase the mechanical properties of porous bioceramics for bone regeneration at weight bearing sites.
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Su, Ya Yu, Xiao Lei Li, Hui Jie Tang, Zhi Hao Zhao, and Jian He. "Thermal Shock Behavior and Bonding Strength of MoSi2-BaO-Al2O3-SiO2 Gradient Porous Coating with Polymethyl Methacrylate Addition for Porous Fibrous Insulations." Solid State Phenomena 281 (August 2018): 493–98. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.493.

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In order to improve the thermal shock behavior of high temperature resistant coating on porous fibrous referactory insulations, the MoSi2-BaO-Al2O3-SiO2(MoSi2-BAS) gradient porous coatings were designed by preparing a dense surface layer and a porous bonding layer with the method of brushing and subsequent sintering at 1773 K. The porous bonding layer was obtained by adding polymethyl methacrylate (PMMA) as pore former. As the content of PMMA increases, the MoSi2-BAS coatings changed from a dense structure into a gradient porous structure. The interface bonding strength and thermal shock resistance of the MoSi2-BAS coatings were investigated. The result shows that the as-prepared coating with gradient porous structure exhibited excellent thermal shock resistance, which remained gradient structure without cracking after thermal cycling 100 times between 1773 K and room temperature. And the interface bonding strength of the gradient porous coating reached 1.5±0.08 Mpa, which was much better than that of the dense coating.
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Lee, Eunji, Woomi Gwon, and Sangwoo Ryu. "Nucleation and Growth-Controlled Morphology Evolution of Cu Nanostructures During High-Pressure Thermal Evaporation." Korean Journal of Metals and Materials 59, no. 2 (February 5, 2021): 135–41. http://dx.doi.org/10.3365/kjmm.2021.59.2.135.

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The formation of porous material structures has been widely investigated for the development of high-performance energy materials, catalysts, and chemical sensing devices. Various nanoporous structure fabrication methods are based on wet-chemical processes, which require precise control of the process parameters. Physical vapor deposition such as thermal evaporation utilizes high vacuum so that the deposition process is relatively simple, free of contamination, and easily reproduced. However, because of the long mean-free-path of the evaporated atoms in high vacuum, heterogeneous nucleation and the growth of adatoms occurs on the substrate surface, which results in the formation of dense and compact thin films. But by changing the working pressure, various morphologies of porous nanostructures can be obtained. As applied to copper, with increasing pressure the thin film evolves from a dense structure to a coral-like nanoporous structure through a porous columnar structure. All of the porous structures consist of nanoparticle aggregates, where copper nanoparticles are connected to each other, and many nano-gaps are found inside the aggregates. A surface plasmonic effect is expected. The porous copper nanostructured films demonstrated high surfaceenhanced Raman spectroscopy activity.
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Maîtrejean, Guillaume, Patrick Terriault, and Vladimir Brailovski. "Density Dependence of the Macroscale Superelastic Behavior of Porous Shape Memory Alloys: A Two-Dimensional Approach." Smart Materials Research 2013 (September 19, 2013): 1–13. http://dx.doi.org/10.1155/2013/749296.

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Porous Shape Memory Alloys (SMAs) are of particular interest for many industrial applications, as they combine intrinsic SMA (shape memory effect and superelasticity) and foam characteristics. The computational cost of direct porous material modeling is however extremely high, and so designing porous SMA structure poses a considerable challenge. In this study, an attempt is made to simulate the superelastic behavior of porous materials via the modeling of fully dense structures with material properties modified using a porous/bulk density ratio scaling relation. Using this approach, direct modeling of the porous microstructure is avoided, and only the macroscale response of the model is considered which contributes to a drastic reduction of the computational cost. Foam structures with a gradient of porosity are also studied, and the prediction made using the fully dense material model is shown to be in agreement with the mesoscale porous material model.
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Arnaud, Gwendoline, Vincent Rey, Julien Touboul, and Damien Sous. "Wave Propagation Through Dense Vertical Cylinder Arrays: 3D Experimental Study." International Journal of Ocean and Coastal Engineering 02, no. 01n02 (March 2019): 1950001. http://dx.doi.org/10.1142/s2529807019500015.

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The purpose of this research work is to study the diffraction of surface gravity waves propagating through rectangular porous medium in three dimensions. The considered porous structure consists of dense arrays of surface piercing vertical cylinders. Experiments for different regular wave conditions have been carried out, especially for three-wave frequencies. The experimental data of wave refraction–diffraction and reflection have been compared to computed results from potential linear theory solved with an integral matching method. Comparison with a previous 2D study about wave propagation through porous medium in a 10 m long wave flume is also discussed in order to highlight the refraction–diffraction effect due to the porous structure.
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Li, Yuan, Ji Qiang Gao, Jian Feng Yang, Hong Jie Wang, and Guan Jun Qiao. "Fabrication of SiC Dense-Porous Laminates by Electrophoretic Deposition Process." Key Engineering Materials 368-372 (February 2008): 1841–43. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1841.

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In order to obtain dense-porous laminated structure in green bodies of SiC ceramics, rapid aqueous electrophoretic deposition (EPD) was introduced. The suspension for the electrophoretic deposition was prepared using silicon carbide, silicon and carbon powders as the starting materials. During the electrophoretic deposition process, the intending dense and porous layers were deposited alternately to form the green body. After drying, the green bodies were reaction-bonded at 1550°C in vacuum atmosphere. Pore fraction of the porous layers could be adjusted by changing process preferences of EPD and suspension composition. Pore size and size distribution could be controlled by using different sized starting powders. Using this process, no additional substance is necessary to generate the pores via burnt-off, and the dense/porous laminated structure can be obtained by one-step sintering process.
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Choi, Youngbin, Keeyoung Jung, Hyeong-Jun Kim, Ji-Woong Moon, and Jong-Won Lee. "Lithium–oxygen batteries with triplex Li+-selective solid membranes." Chemical Communications 55, no. 53 (2019): 7643–46. http://dx.doi.org/10.1039/c9cc03652k.

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Han, Jae-Yun, Chang-Hyun Kim, Sang-Ho Kim, and Dong-Won Kim. "Development of Pd Alloy Hydrogen Separation Membranes with Dense/Porous Hybrid Structure for High Hydrogen Perm-Selectivity." Advances in Materials Science and Engineering 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/438216.

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For the commercial applications of hydrogen separation membranes, both high hydrogen selectivity and permeability (i.e., perm-selectivity) are required. However, it has been difficult to fabricate thin, dense Pd alloy composite membranes on porous metal support that have a pore-free surface and an open structure at the interface between the Pd alloy films and the metal support in order to obtain the required properties simultaneously. In this study, we fabricated Pd alloy hydrogen separation membranes with dense/porous hybrid structure for high hydrogen perm-selectivity. The hydrogen selectivity of this membrane increased owing to the dense and pore-free microstructure of the membrane surface. The hydrogen permeation flux also was remarkably improved by the formation of an open microstructure with numerous open voids at the interface and by an effective reduction in the membrane thickness as a result of the porous structure formed within the Pd alloy films.
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Yasenchuk, Yu, N. V. Artyuhova, K. V. Almaeva, A. S. Garin, and V. E. Gunther. "Segregation in Porous NiTi Made by SHS in Flow Reactor." KnE Materials Science 2, no. 1 (July 17, 2017): 168. http://dx.doi.org/10.18502/kms.v2i1.793.

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The research considers the contribution of gases to the surface formation during self-propagating high-temperature synthesis (SHS) of porous titanium nickelide based alloys. The structure of the obtained porous alloys was analyzed using the methods of secondary ion mass spectrometry (SIMS), optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Nanocrystalline intermetallic oxycarbonitrides of a complicated structure were found on the porous titanium nickelide surface. A dense double gradient layer was found under the outer loose deposits. It is concluded that the dense gradient layer of intermetallic oxycarbonitride provides chemical passivity of the investigated porous alloys. Loose surface deposits of intermetallic oxycarbonitrides ensure successful integration of the alloy into the biological tissue in case of implantation.
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Zhao, Yanjing, Jiwang Jiang, Yiqing Dai, Lan Zhou, and Fujian Ni. "Thermal Property Evaluation of Porous Asphalt Concrete Based on Heterogeneous Meso-Structure Finite Element Simulation." Applied Sciences 10, no. 5 (March 2, 2020): 1671. http://dx.doi.org/10.3390/app10051671.

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Porous asphalt concrete (PAC) can obviously improve vehicle driving safety on rainy days and reduce environmental noise. It has been widely used in China. The existence of a large number of interconnected voids in PAC makes a significant difference in heat transfer and temperature distribution from conventional dense-graded asphalt concretes (AC). In this paper, the internal structure images of three dense-graded asphalt mixtures and one PAC were obtained by X-ray CT scanning technology, and the internal meso-structure finite element simulation models of asphalt mixtures were established by using the mapped meshing method. The temperature variations of asphalt mixture specimens during laboratory cooling and heating processes were simulated in this study, and laboratory tests were carried out to verify the simulation accuracy. Due to the simulation results, it was found that the thermal characteristics of the PAC mixture were different from those of the dense-graded asphalt mixture due to the large interconnected air void content in the PAC mixture. The temperature field in the PAC mixture was more sensitive to ambient air temperature under laboratory conditions. Moreover, in PAC specimens, temperature distributed more unevenly than in dense-grade asphalt mixtures. Therefore, it is necessary to consider the internal meso-structure of porous asphalt mixtures while simulating the temperature field in PAC specimens or pavement structures.
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Дисертації з теми "Dense and porous structure"

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Singh, Kamaljit Engineering &amp Information Technology Australian Defence Force Academy UNSW. "Dynamics of residual non-aqueous phase liquids in porous media subject to freeze-thaw." Awarded by:University of New South Wales - Australian Defence Force Academy. Engineering & Information Technology, 2009. http://handle.unsw.edu.au/1959.4/44875.

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This project concerns the effect of freeze-thaw cycles on the pore-scale structure of nonaqueous phase liquid (NAPL) contaminants in water-saturated porous media. This problem is of critical importance to the entrapment of such contaminants in cold temperate, polar and high altitude regions, and has not been examined in the literature to date. This research work is conducted in three stages: (i) two-dimensional nondestructive visualisation of residual light non-aqueous phase liquid (LNAPL), and dense non-aqueous phase liquid (DNAPL), in porous media subject to successive freeze-thaw cycles; (ii) three-dimensional experiments on LNAPL in porous media subject to freeze-thaw, with quantification of phase volumes by X-ray micro-computed tomography (micro-CT); and (iii) the explanation of results by several pore scale mathematical and conceptual models. The two-dimensional cell experiments (using a monolayer of 0.5 mm diameter glass beads held between two glass sheets), and three-dimensional X-ray micro-CT experiments reveal a substantial mobilisation and rupture of ganglia during successive freeze-thaw cycles; this includes the detachment of smaller ganglia from larger ganglia and the mobilisation of NAPL in the direction of freezing front. The experiments also reveal significant shedding of numerous single/sub-singlet ganglia along narrow pore corridors, their entrapment in growing polycrystalline ice, and the coalescence of such small ganglia during thawing to form larger singlets. These changes were more predominant where the freezing commenced. The results of the experimental studies were interpreted by developing several mathematical and conceptual models, including freezing-induced pressure model, Darcy's law model, multipore ganglia model (rupture coefficient) and ice-snap off model.
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Füldner, Gerrit, and Andreas Velte. "Water adsorption kinetics and diffusion in dense SAPO-34 layers on porous aluminium fibre structures – macroscopic measurements by a Volumetric Differential Pressure Step Method." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198145.

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Füldner, Gerrit, and Andreas Velte. "Water adsorption kinetics and diffusion in dense SAPO-34 layers on porous aluminium fibre structures – macroscopic measurements by a Volumetric Differential Pressure Step Method: Water adsorption kinetics and diffusion in dense SAPO-34 layers on porousaluminium fibre structures – macroscopic measurements by a VolumetricDifferential Pressure Step Method." Diffusion fundamentals 24 (2015) 15, S. 1, 2015. https://ul.qucosa.de/id/qucosa%3A14529.

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Tazi, Bouchra. "Élaboration et caractérisation d'une nouvelle membrane minérale conductrice ionique à structures dense et microporeuse." Montpellier 2, 1988. http://www.theses.fr/1988MON20138.

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Ce travail presente l'elaboration d'une nouvelle membrane conductrice ionique en nasicon (na::(3)zr::(2)si::(2)po::(61)). Les tests d'echanges ioniques montrent la possibilite d'echange entre des ions na**(+) et des cations ag**(+), k**(+), li**(+) et na**(+))
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Chan, Wing Nin. "Comparison of the wearing of porous and dense NiTi shape memory alloy." access abstract and table of contents access full-text, 2006. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21458406a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2006.
"Master of Science in Materials Engineering & Nanotechnology dissertation." Title from title screen (viewed on Nov. 23, 2006) Includes bibliographical references.
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Kou, Shuting, and 寇舒婷. "Porous structure modeling with computers." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206700.

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Porous structures are a particular type of solids, where a large number of pores exist in the geometric domain of interest. Research on porous structures have received increasingly keen interest in recent years and this is largely because of many unique and superior properties that porous structures possess. They can undertake special tasks which general solid materials are not competent to do. In recent twenty years numerous representations are put forward for porous structure modeling. But the challenges in practical porous structure design still exist and the structure heterogeneity brings many difficulties. This thesis is motivated to propose new porous structure modeling strategies which are more accurate, flexible and easy for porous structure description. An approach of porous structure modeling based on quadtree/octree and NURBS is proposed first. Quadtree and octree are tools for modeling domain partition. The pore size and pore distribution are controlled by the flexibility of quadtree and octree enumeration technique. Derived polygon and polyhedron are then introduced to assist the generation of NURBS curves and surfaces. These NURBS curves and surfaces form the boundaries of the porous structures. However there are limitations of the above method. The accurate control of porosity is not easily achieved in 3D porous structure modeling and seemingly adopting quadtree/octree for the modeling domain partition is also less than satisfactory. Hence a new representation for porous structures based on Centroidal Voronoi tessellation (CVT) and pore-network is put forward. CVT is utilized for modeling domain partition because the CVT cells are approximate hexagons which is widely existent in plants, animals and other cellular structures in nature. The density distribution function used in CVT generation also helps to build functionally graded porous structures. Pore-network, which is a mature and commonly used model in the research of multiphase flow in porous media, is subsequently introduced to build the porous structures. This modeling approach results in porous structures that could mimic the geometry and performance of structures in nature. To evaluate the object’s properties, finite element analysis (FEA) is conducted on the porous structure models represented by the two methods. The mechanics properties of the two types of models are analyzed. The stress-strain curve of each sample is plotted and the effective Young’s modulus is calculated. Comparison of these two types of models is also done. Besides, the contributions of the thesis and suggestions for future research are also discussed.
published_or_final_version
Mechanical Engineering
Master
Master of Philosophy
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He, Xing. "Processing of porous and dense ceramics using natural polymer binders for biomedical applications." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503879.

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Ceramics have long been used in different biomedical applications. Examples include biodegradable porous ceramic scaffolds and bioactive dense ceramic implants and prostheses. For the fabrication of different forms of ceramics, polymer binders, organic solvents and hazardous processing aids have often been used. Some of them, e.g. acrylamide monomers used in the conventional gelcasting processing. are even toxic. There is a compelling need to develop eco-friendly processing of ceramics. In this work, an environmentally-friendly protein system - egg white protein - has been employed to fabricate porous and dense ceramics to take the advantage of the well-known foaming and gelling capabilities of egg white protein.
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Şimşek, Deniz Çiftçioğlu Muhsin. "Preparation and characterization of HA powders-dense and porous HA based composite materials/." [s.l.: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000326.pdf.

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Marangoni, Mauro. "Dense and porous glass and glass ceramics from natural and waste raw materials." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424468.

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The main goal of the herewith presented research activities was to develop innovative processes and materials for building applications adapted to the needs of Saudi Arabia according to the information exchanged with the partners from KACST (King Abdulaziz City of Science and Technology). The research activity focused on the development of a wide range of ceramic components via sinter-crystallization of glasses produced from waste (fly ash, slag, sludge) with or without the addition of vitrification aids, such as cullet or silicates. The raw materials have been mixed in the appropriate ratios to yield ceramic compositions that could be used in the building industry (e.g glass ceramic tiles, porous panels, lightweight aggregates). Monolithic, porous or dense, sintered glass ceramics and ceramics were manufactured as substitutes for natural stones or traditional ceramics. Dense glass ceramics have outstanding properties (hardness, mechanical strength, durability), while porous glass ceramics provide low density and thermal conductivity. Furthermore highly reflective glazes, also matching the whiteness of Thassos marble, were manufacture sintering glass frits. All the developed materials are based on the use of natural resources or waste materials from Saudi Arabia. Moreover, several techniques for direct foaming of glass ceramics have been developed, leading to highly porous ceramics with mainly closed cells. Alternative techniques have been developed for the production of open-celled ceramics.
Il principale obiettivo delle attività di ricerca qui presentate riguardano lo sviluppo di nuovi processi e materiali per applicazioni in edilizia adattate alle esigenze dell'Arabia Saudita in base alle informazioni scambiate con i partner di KACST (King Abdulaziz City of Science and Technology). L'attività di ricerca è stata focalizzata sullo sviluppo di una vasta gamma di componenti ceramici mediante sintercristallizzazione di vetri prodotti da rifiuti (ceneri volanti e scorie) con o senza l'aggiunta di fondenti come rottame di vetro o silicati. Le materie prime sono state miscelate in rapporti adeguati alla produzione di composizioni ceramiche adatte all’utilizzo in edilizia; ad esempio piastrelle vetroceramiche, pannelli alleggeriti e aggregati leggeri. Vetroceramiche e ceramiche, dense e porose, sono state realizzate come sostituti alle pietre naturali e ai ceramici tradizionali. Vetroceramici densi presentano proprietà eccezionali (durezza, resistenza meccanica, durabilità), mentre vetroceramiche porose presentano ridotte densità e conducibilità termica. Inoltre sinterizzando fritte vetrose sono stati ottenuti smalti altamente riflettenti con bianchezza corrispondente al marmo di Thassos. Tutti i materiali sviluppati sono basati sull'utilizzo di risorse naturali o materiali di scarto provenienti dall’Arabia Saudita. Inoltre, sono state sviluppate diverse tecniche per la schiumatura diretta di vetroceramiche, portando alla realizzazione di materiali altamente porosi con celle principalmente chiuse. Utilizzando tecniche alternative sono state invece sviluppate vetroceramiche con una prevalenza di celle aperte.
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Anderson, Michael Robert. "The dissolution and transport of dense non-aqueous phase liquids in saturated porous media /." Full text open access at:, 1988. http://content.ohsu.edu/u?/etd,171.

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Книги з теми "Dense and porous structure"

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Schwille, Friedrich. Dense chlorinated solvents in porous and fractured media: Model experiments. Chelsea, MI: Lewis Publishers, 1988.

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2

Porous media: Fluid transport and pore structure. 2nd ed. San Diego: Academic Press, 1992.

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3

Krasilʹnikova, O. K. Porous structure and adsorption behaviours of chitosan. Hauppauge, N.Y: Nova Science Publishers, 2010.

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4

Chatterjee, Abhijit. Structure property correlations for nanoporous materials. Boca Raton: Taylor & Francis, 2010.

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Chatterjee, Abhijit. Structure property correlations for nanoporous materials. Boca Raton: CRC Press/Taylor & Francis, 2010.

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Chatterjee, Abhijit. Structure property correlations for nanoporous materials. Boca Raton: Taylor & Francis, 2010.

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7

1964-, Wong T. W., ed. Handbook of zeolites: Structure, properties and applications. Hauppauge, NY: Nova Science Publishers, 2009.

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Ruren, Xu, ed. Chemistry of zeolites and related porous materials synthesis and structure. Hoboken, N.J: John Wiley, 2007.

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9

Ding, Mei. Self-sealing/healing isolation and immobilization caused by chemical discontinuities in porous media. [Utrecht: Universiteit Utrecht, 1998.

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Structure property correlations for nanoporous materials. Boca Raton: Taylor & Francis, 2010.

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Частини книг з теми "Dense and porous structure"

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Oda, M., K. Iwashita, and H. Kazama. "Micro-Structure Developed in Shear Bands of Dense Granular Soils and its Computer Simulation — Mechanism of Dilatancy and Failure—." In IUTAM Symposium on Mechanics of Granular and Porous Materials, 353–64. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5520-5_32.

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2

Kanamura, Kiyoshi, Ryo Oosone, Hirokazu Munakata, and Masashi Kotobuki. "Lithium Ion Conductive Solid Electrolyte with Porous/Dense Bi-Layer Structure for All Solid State Battery." In Ceramic Materials for Energy Applications, 177–83. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118095386.ch17.

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Stenzel, Olaf. "Oxide Coatings: Porous and Dense Films." In Optical Coatings, 187–208. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54063-9_7.

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Giorno, Lidietta, Enrico Drioli, and Heiner Strathmann. "Characterization of Porous and Dense Membranes." In Encyclopedia of Membranes, 1–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_993-1.

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Giorno, Lidietta, Enrico Drioli, and Heiner Strathmann. "Characterization of Porous and Dense Membranes." In Encyclopedia of Membranes, 362–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_993.

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Pope, E. J. A., and J. D. Mackenzie. "Porous and Dense Composites from Sol-Gel." In Tailoring Multiphase and Composite Ceramics, 187–94. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2233-7_15.

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Dullien, F. A. L. "Structure of Porous Media." In Transport Processes in Porous Media, 3–41. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3628-0_1.

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Gueven, Alper, and Zeynep Hicsasmaz Katnas. "Transport in Porous Media." In Pore Structure in Food, 21–26. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7354-1_4.

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Liu, Zhen. "Hydrodynomechanics: Fluid-Structure Interaction." In Multiphysics in Porous Materials, 319–32. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93028-2_25.

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Dikranjan, D., and W. Tholen. "Dense Maps and Pullback Stability." In Categorical Structure of Closure Operators, 305–29. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8400-5_9.

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Тези доповідей конференцій з теми "Dense and porous structure"

1

Sauter, M., V. Martínez García, and A. Killinger. "HVSFS Al2O3-TiO2 Coatings of Porous Aluminium Substrates." In ITSC2022. DVS Media GmbH, 2022. http://dx.doi.org/10.31399/asm.cp.itsc2022p0596.

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Abstract In a novel approach for guiding elements of sawing machines wear resistant coatings were applied on open-porous AlSi7Mg substrates by means of high velocity suspension flame spraying (HVSFS). The challenge is to establish a wear resistant coating but simultaneously maintain the open-porous structure that is necessary to serve as a permeable structure for liquid cooling or lubricant media under operation. In a first approach, a water-based suspension containing a mixed Al2O3-TiO2 powder for HVSFS was used to deposit dense and well adherent mixed-oxide coatings. As the substrates exhibit an open-porous structure and a well-defined pore size distribution, transpiration cooling through the pores is possible and even necessary in order to ensure a low thermal impact on the fragile pore structure, preserving the open-porosity of the substrate. The coatings are characterized and compared by the means of light microscopy and hardness indentation.
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Livshits, Maya, Lior Avivi, and Abraham Kribus. "Dense Wire Mesh as a High-Efficiency Solar Volumetric Absorber." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-5080.

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Heating a gas to over 1,000°C with concentrated sunlight can enable advanced high-performance applications such as solar-driven combined cycles and solar thermo-chemical processes. Solar receivers using volumetric porous absorbers are intended to produce the ‘volumetric effect’ leading to reduced heat loss and high absorber efficiency. However, experiments on volumetric absorbers have not shown this effect, and the absorbers’ efficiency is usually in the range of 70–80% rather than the desirable range of over 90%. Several porous structure geometries, including the well-known ceramic honeycomb and ceramic foam, were investigated with a numerical model. The results show that even optimal configurations still fall short of the desired range of absorber efficiency. A new candidate structure, a dense wire mesh, was investigated and compared to the conventional absorbers. The volumetric convection coefficient was also measured experimentally to provide validation of the single report found in the literature for this structure. An attractive solution with high efficiency of 90% was found for a dense wire mesh with pore diameter of 1 mm and porosity of 0.83. This geometry seems then a promising candidate for future volumetric absorbers.
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Chabert, Max, Lahcen Nabzar, Virginie Beunat, Emie Lacombe, and Amandine Cuenca. "Impact of Surfactant Structure and Oil Saturation on the Behavior of Dense CO2 Foams in Porous Media." In SPE Improved Oil Recovery Symposium. Society of Petroleum Engineers, 2014. http://dx.doi.org/10.2118/169116-ms.

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Hussong, B., V. Lünnemann, and W. Tillmann. "Investigation of the Interface of Overlapping Splats for a WC-Based Cermet." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0553.

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Abstract In this investigation, the behavior of overlapping HVOF-sprayed WC-Co splats is analyzed. Samples are sprayed and documented in several steps with a low density of splats. This method enables to distinguish between several splats in areas where overlapping clusters of splats occur. The splats are sorted according to their chronological order of impact. With this information, cross sections are made of these clusters to study the porous structure, developing in the center and at the boundaries of the splats. An ion-polishing method was employed to avoid the corruption of small pores and structures by mechanical force. It turns out that pores in HVOF coatings are initiated by the overlapping regions at the edges of the splats. Splats impacting directly onto each other show very dense microstructures at the interface in the center region of the impact.
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DeGiorgi, Virginia G., and Muhammad A. Qidwai. "Mesoscale Analysis of Porous Shape Memory Alloys." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1687.

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Abstract Shape memory alloys are frequently used in smart materials and structures as the active component. Their ability to provide high force and large displacements has been used to the advantage in many applications. The majority of applications to date utilize solid shape memory alloy materials in quasi-static loading conditions. Recent work has proposed the use of porous SMAs as an energy absorbing material under dynamic loading conditions. The use of porous SMAs under dynamic loading will require advancements in the understanding of SMA behavior both in the dense or solid form and in the porous form. The current work examines the quasi-static behavior of porous SMA as a first step. The material behavior is modeled on a mesoscale level allowing for the examination of pore size and shape variation effects. Bulk material response is estimated and compared with micromechanical periodic unit cell predictions.
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de Lemos, Marcelo J. S., and Renato Alves da Silva. "Simulation of Turbulent Flow in a Channel Partially Occupied by a Porous Layer Considering the Stress Jump at the Interface." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31279.

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Environmental flows of extreme importance, such as turbulent atmospheric boundary layer over thick rain forests, may benefit from more realistic mathematical models. Accordingly, flow over layers of dense vegetation can be characterized by some sort of porous structure through which a fluid permeates. For hybrid media, involving both a porous structure and a clear flow region, difficulties arise due to the proper mathematical treatment given at the interface. The literature proposes a jump condition in which shear stresses on both sides of the interface are not of the same value. This paper presents numerical solutions for such hybrid medium, considering here a channel partially filled with a porous layer through which fluid flows in turbulent regime. One unique set of transport equations is applied to both regions. Effects of Reynolds number, porosity, permeability and jump coefficient on mean and turbulence fields are investigated. Results indicate that depending on the value of the stress jump parameters, a substantially different structure for the turbulent field is obtained.
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Kongsuwan, Panjawat, Grant B. Brandal, and Y. Lawrence Yao. "Laser Induced Porosity and Crystallinity Modification of a Bioactive Glass Coating on Titanium Substrates." In ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9272.

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Functionally graded bioactive glass coatings on bioinert metallic substrates were produced by using continuous-wave (CW) laser irradiation. The aim is to achieve strong adhesion on the substrates and high bioactivity on the top surface of a coating material for load-bearing implants in biomedical applications. The morphology and microstructure of the bioactive glass from the laser coating process were investigated as functions of processing parameters. Laser sintering mechanisms were discussed with respect to the resulting morphology and microstructure. It has been shown that double layer laser coating results in a dense bond coat layer and a porous top coat layer with lower degree of crystallinity than an enameling coating sample. The dense bond coat strongly attached to the titanium substrate with a ten microns wide mixed interfacial layer. A highly bioactive porous structure of the top coat layer is beneficial for early formation of a bone-bonding HCA layer. The numerical model developed in this work also allows for prediction of porosity and crystallinity in top coat layers of bioactive glass developed through laser induced sintering and crystallization.
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Ando, Yasutaka, Shogo Tobe, Takashi Saito, Hirokazu Tahara, and Takao Yoshikawa. "Dense Oxide Coating Deposition by High Velocity TPCVD Utilizing Boiling of Metal Alcoxide." In ITSC2004, edited by Basil R. Marple and Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0683.

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Abstract Thermal plasma CVD is hoped to be made fit for practical use because this process is the process which can fabricate precisely structure and component controlled coatings. Especially, TPCVD will be used in the industrial fields where thermal spraying has been used so far since TPCVD come to be studied under an atmospheric environment recently. However, TPCVD coatings fabricated under an atmospheric environment is porous and brittle. So that, TPCVD has been mostly carried out under a low pressure environment and high equipment cost has been demanded. As for the method to solve this problem, according to the report on a gas-deposition process, improvement of the jet flow is thought to be useful. Therefore, in this study, in order to obtain dense and rigid film by TPCVD under an atmospheric environment, Dense oxide coating deposition by High velocity TPCVD utilizing boiling of metal alkoxide was carried out. Consequently, though only brittle coating was deposited on the condition without boiling of metal alkoxide, dense and rigid coating was deposited even under an atmospheric environment on the condition with boiling. From this result, TPCVD was found to have high potential for rapid deposition of dense and rigid coatings.
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Jia, Fang, Lihua Gao, Yueguang Yu, Xiojuan Ji, Deming Zhang, Haoran Peng, Xiaoliang Lu, and Weiao Hou. "Influence of YSZ Powder Characteristics on the Morphology of PS-PVD Thermal Barrier Coatings." In ITSC2019, edited by F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux, and C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0975.

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Abstract The aim of this study is to understand how the characteristics of feedstock powders impact the morphology of thermal spray coatings. In the experiments, YSZ powders were prepared, characterized, and deposited on nickel-base superalloy substrates by plasma spray physical vapor deposition (PS-PVD) and the coatings were examined and tested. The results indicate that particle size distribution is an important factor in coating quality and that very fine-grained powder (< 12 µm) is not conducive to the formation of a columnar crystal structure. A powder with a rough, porous structure, on the other hand, readily absorbs heat and is thus easily vaporized, leading to a good columnar structure in the coating. In contrast, dense powder is difficult to vaporize, which promotes the formation of layered structures. Among the coatings with a columnar structure, one produced from powders with a particle size of 16.7 µm exhibited the lowest porosity and highest microhardness.
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Jordan, E. H., B. M. Cetegen, M. Gell, D. Chen, S. Basu, M. Teicholz, and X. Ma. "Fundamental Understanding of the Liquid Precursor Plasma Spray Process Through Modeling and Experiments." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1450.

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Abstract Abstract-Solution precursor plasma spray (SPPS) is a relatively new thermal spray process in which chemical precursors are injected into DC-arc plasma spray torch in place of powder. This process is able to make relatively porous (15-25% porosity) thermal barrier coatings with through-thickness cracks that enhance their thermal strain resistance. The SPPS process can also make dense titania and alumina zirconia coatings. The process can make thin and thick coatings, dense and porous coatings, structural and functional preforms, new compositions, and metastable materials. Metastable materials arise because the solution is molecularly mixed and the cooling rate in thermal spray is high. The process has the disadvantage of needing to provide energy to evaporate the solvent and of being a new process where less extensive empirical knowledge and modeling insights exist, compared to air plasma spray with powders. The microstructure process parameter relation is explored. Results from modeling studies concerning evaporation of droplets and related solute concentration gradients, modeling studies of aerodynamic break-up and experimental studies of non-aero-based droplet break-up and of the effects of solution concentration will be described. These studies will be related to experimental results for making dense coatings.
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Звіти організацій з теми "Dense and porous structure"

1

Xiong, Yalin, and Steven A. Shafer. Dense Structure from a Dense Optical Flow Sequence. Fort Belvoir, VA: Defense Technical Information Center, April 1995. http://dx.doi.org/10.21236/ada311290.

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Peterson, D. W., and L. T. Nguyen. Porous Si structure as moisture sensor. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/432952.

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Starrett, Charles, and Nathaniel Shaffer. Multiple Scattering Theory for Dense Plasma Electronic Structure. Office of Scientific and Technical Information (OSTI), October 2020. http://dx.doi.org/10.2172/1671072.

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Moore, W., A. Lange, K. Sasan, J. Ha, and G. Kosiba. Simulating Dopant Diffusion in a Detalied Porous Structure. Office of Scientific and Technical Information (OSTI), August 2021. http://dx.doi.org/10.2172/1817990.

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Hutnik, Michelle, Ali S. Argon, Frank T. Gentile, Peter J. Ludovice, and Ulrich W. Suter. Simulation of the Structure of Dense, Amorphous Bisphenol-A polycarbonate. Fort Belvoir, VA: Defense Technical Information Center, May 1991. http://dx.doi.org/10.21236/ada237222.

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stephen B. Margolis and Forman A. Williams. Structure and Stability of Deflagrations in Porous Energetic Materials. Office of Scientific and Technical Information (OSTI), March 1999. http://dx.doi.org/10.2172/751013.

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Radovic, Ljubisa R., and Patrick G. Hatcher. Effects of Surface Chemistry on the Porous Structure of Coal. Office of Scientific and Technical Information (OSTI), May 1997. http://dx.doi.org/10.2172/2275.

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Ivanov, Vladimir V. Study of the internal structure, instabilities, and magnetic fields in the dense Z-pinch. Office of Scientific and Technical Information (OSTI), August 2016. http://dx.doi.org/10.2172/1296928.

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Glass, R. J., and D. L. Norton. Wetted-region structure in horizontal unsaturated fractures: Water entry through the surrounding porous matrix. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/138298.

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Small, Ward, Cindy T. Alviso, and Tom R. Metz. Gamma Radiation Aging Study of a Dow Corning SE 1700 Porous Structure Made by Direct Ink Writing. Office of Scientific and Technical Information (OSTI), November 2015. http://dx.doi.org/10.2172/1240974.

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