Relevant bibliographies by topics / Porosity

Academic literature on the topic 'Porosity'

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Published: 4 June 2021
Last updated: 21 September 2024

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Journal articles on the topic "Porosity"

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Huang, Long-Ming, H. C. Chan, and Jung-Tai Lee. "A Numerical Study on Flow around Nonuniform Porous Fences." Journal of Applied Mathematics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/268371.

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The effects of a porous fence with a nonuniform porosity on flow fields are investigated numerically. First, an experiment with a non-uniform porous fence located in a wind tunnel is performed to obtain a reference data set. Then, a numerical model that utilizes the finite volume scheme with a weakly compressible-flow method to solve the continuity and momentum equations is developed. The numerical simulation is compared to experimental measurements for validation purposes. As a result, the numerical predictions show good agreements with the experimental data. Finally, the numerical investigations of the flow fields around porous fences with various combinations of upper and lower fence porosity are also presented. When the upper porosity is greater than the lower porosity, the Protection Index PI0.1, PI0.3and PI0.5, representing the adverse sheltering effect, decreases compared to that of the uniform porous fence. When the upper porosity is less than the lower porosity, the PI0.5increases and the variations of the PI0.1and PI0.3, depend on the upper porosity, compared to that of the uniform porous fence. The results show that the porous fence with the upper fence porosityεU=0%and the lower fence porosityεL=30%gives the best sheltering effect among the porous fences in this study.
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Karongi, Herlina Bunga', Muhamad Arsyad, Usman Usman, Pariabti Palloan, and Sulistiawaty Sulistiawaty. "ANALISIS POROSITAS MATERIAL KAWASAN KARST MAROS PANGKEP TAMAN NASIONAL BANTIMURUNG BULUSARAUNG BERBASIS VARIASI UKURAN BUTIR." Jurnal Sains dan Pendidikan Fisika 19, no. 1 (April 22, 2023): 97. http://dx.doi.org/10.35580/jspf.v19i1.39250.

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Abstrak-Telah dilakukan penelitian tentang porositas berdasarkan variasi ukuran butir batuan kawasan Karst Maros-Pangkep. Tujuan dari penelitian ini adalah untuk mengetahui gambaran nilai porositas batuan di Kawasan Karst Maros-Pangkep berdasarkan variasi ukuran butir dan menentukan pengaruh ukuran butir terhadap porositas batuan di Kawasan Karst Maros-Pangkep. Proses dimulai dari penentuan ukuran butir menggunakan lima macam saringan/ayakan, yaitu dengan nomor 50 mesh, 30 mesh, 16mesh, 10 mesh dan 4 mesh. Porositas ditentukan dengan menggunakan metode penimbangan. Setelah perhitungan ukuran rata-rata butir didapat selanjutnya dihubungkan dengan porositas dengan metode analisis regresi. Berdasarkan perhitungan statistik diperoleh persamaan regresi linear batuan Karst Maros-Pangkep, yaitu Y=15,00-2,82X dengan R2.=0,78. Diperoleh pengaruh ukuran butir terhadap porositas batuan kawasan karst Maros-Pangkep bernilai negatif artinya ukuran butir berbanding terbalik dengan porositas batuan di kawasan karst Maros-Pangkep. Semakin kecil ukuran butir maka porositas semakin besar dan semakin besar ukuran butir porositas semakin kecil. Kata kunci : Porositas, ukuran butir, batuan karst Pangkep, batuan karst Maros Abstrak-Research on porosity has been carried out based on variations in grain size of the Maros-Pangkep Karst area. The purpose of this study was to describe the value of rock porosity in the Maros-Pangkep Karst Region based on grain size variations and to determine the effect of grain size on rock porosity in the Maros-Pangkep Karst Region. The process starts from determining the grain size using five kinds of sieves, namely with numbers 50 mesh, 30 mesh, 16mesh, 10 mesh and 4 mesh. Porosity is determined using the weighing method. After calculating the average grain size obtained, it is then connected to the porosity by using the regression analysis method. Based on statistical calculations obtained linear regression equation Maros-Pangkep karst rock, namely Y=15.00-2.82X with R2.=0.78. The effect of grain size on the rock porosity of the Maros-Pangkep karst area is negative, meaning that the grain size is inversely proportional to the porosity of the rocks in the Maros-Pangkep karst area. The smaller the grain size, the larger the porosity and the smaller the porosity. Keywords: porosity, grain size, Pangkep karst rock, Maros karst rock
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Zajìček. "POROSITY AND σ-POROSITY." Real Analysis Exchange 13, no. 2 (1987): 314. http://dx.doi.org/10.2307/44151885.

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Mera, M. E., M. Mor n, D. Preiss, and L. Zaj cek. "Porosity, -porosity and measures." Nonlinearity 16, no. 1 (November 22, 2002): 247–55. http://dx.doi.org/10.1088/0951-7715/16/1/315.

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Halauddin, Halauddin, Suhendra Suhendra, and Muhammad Isa. "Lattice Gas Automata Applications to Estimate Effective Porosity and Permeability Barrier Model of the Triangle with a Height Variation." Journal of Aceh Physics Society 9, no. 2 (May 1, 2020): 48–54. http://dx.doi.org/10.24815/jacps.v9i2.16056.

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Penelitian ini bertujuan untuk menghitung porositas efektif (фeff) dan permeabilitas (k) menggunakan model segitiga dengan variasi tinggi yaitu 3, 4, 5, 6 dan 7 cm. Perhitungan porositas dan permeabilitas yang efektif dilakukan dengan menggunakan model Lattice Gas Automata (LGA), yang diimplementasikan dengan bahasa pemrograman Delphi 7.0. Untuk model segitiga penghalang dengan tinggi 3, 4, 5, 6 dan 7 cm, nilai porositas efektif dan permeabilitas, masing-masing: фeff (T1) = 0,1690, k (T1) = 0 , 001339 pixel2; фeff (T2) = 0,1841, k (T2) = 0,001904 pixel2; фeff (T3) = 0,1885, k (T3) = 0,001904 pixel2; фeff (T4) = 0,1938, k (T4) = 0001925 pixel2; dan фeff (T5) = 0,2053, k (T5) = 0,002400 pixel2. Dari hasil simulasi, diperoleh tinggi segitiga akan berpengaruh signifikan terhadap nilai porositas efektif dan permeabilitas. Pada segitiga lebih tinggi, menyebabkan tabrakan model aliran fluida LGA mengalami lebih banyak hambatan untuk penghalang, sehingga porositas efektif dan permeabilitas menurun. Sebaliknya, jika segitiga lebih rendah, menyebabkan tabrakan model aliran fluida LGA mengalami lebih sedikit hambatan untuk penghalang, sehingga porositas efektif dan permeabilitas meningkat.This research purposed to calculate the effective porosity (feff) and permeability (k) using the barrier model of the triangle with a high varying are 3, 4, 5, 6 and 7 cm. Effective porosity and permeability calculations performed using the model Lattice Gas Automata (LGA), which is implemented with Delphi 7.0 programming language. For model the barrier triangle with a high of 3, 4, 5, 6 and 7 cm, the value of effective porosity and permeability, respectively: feff(T1)=0,1690, k(T1)=0,001339 pixel2; feff(T2)=0,1841, k(T2)=0,001904 pixel2; feff(T3)=0,1885, k(T3)=0,001904 pixel2; feff(T4)=0,1938, k(T4)= 0001925 pixel2; and feff(T5)=0,2053, k(T5)=0,002400 pixel2. From the simulation results, obtained by the high of the triangle will be a significant effect on the value of effective porosity and permeability. If the triangle highest, causing the collision of fluid flow models LGA experience more obstacles to the barrier, so that the effective porosity and permeability decrease. Conversely, if the triangle lower, causing the collision of fluid flow models LGA experience less obstacles to the barrier, so that the effective porosity and permeability increases.Keywords: Effective porosity, permeability, model triangle, model LGA
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Kelar. "Topologies generated by porosity and strong porosity." Real Analysis Exchange 16, no. 1 (1990): 255. http://dx.doi.org/10.2307/44153694.

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Rice, Roy W. "Evaluating Porosity Parameters for Porosity-Property Relations." Journal of the American Ceramic Society 76, no. 7 (July 1993): 1801–8. http://dx.doi.org/10.1111/j.1151-2916.1993.tb06650.x.

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Wang, Yan En, Qin Han, Shen Ming Wei, Peng Lin Li, Ming Ming Yang, Yan Lei Qin, Yue Bo Wang, and Jin Hua Zhou. "Analysis to Effective Elastic Modulus and Porosity for Artificial Bone Scaffold with Hydroxyapatite Microspheres." Advanced Materials Research 424-425 (January 2012): 241–45. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.241.

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The effective elastic modulus of hydroxyaptite (HA) microspheres composite scaffold is determined by the HA microspheres’ elastic modulus, accumulation topology model and the porosity. Experiments showed that different accumulation pattern and porosity has different modulus for bone scaffold. Furthermore, porosity and accumulation pattern are affected directly by the adhesive thickness. Here, we elucidate the effect of the scaffold parameters on bone sitffness and porostiy by means of a mathmatically based approach. Based on ANSYS simulation platform, the effective elastic modulus of HA microspheres scaffold was demonstrated. And the effective elastic modulus of artificial bone scaffold with different adhesive thickness was calculated by using APDL. Use the void fraction to illustrate the porosity of HA microspheres scaffold, which is an important consideration when attempting to evaluate the potential volume of water and hydrocarbons it may contain. By analysis of the optimization results, the effective elastic modulus reaches the maximum when the adhesive layer thickness is 0.05 mm, while the corresponding porosity is 0.5231
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Chan, JJ. "Performing Porosity." Performance Research 25, no. 5 (July 3, 2020): 129–34. http://dx.doi.org/10.1080/13528165.2020.1868854.

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Gorman, Jessica. "Perfecting Porosity." Science News 159, no. 25 (June 23, 2001): 398. http://dx.doi.org/10.2307/3981922.

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Dissertations / Theses on the topic "Porosity"

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Speight, Gareth. "Porosity and differentiability." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/58137/.

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We investigate porous sets and differentiability of Lipschitz functions. A set P is upper (lower) porous if each point of P sees, on arbitrarily small scales (all sufficiently small scales), nearby holes in P of radius proportional to their distance away. The set P is called directionally upper/lower porous if, for each point of P, the corresponding holes can be chosen with centres on a fixed line. After an overview of porosity and differentiability, we begin by highlighting a difference between upper porosity and lower porosity. Upper porous sets in Rn are necessarily directionally upper porous. We show there exists a lower porous set in R2 which is not even a countable union of directionally lower porous sets. Next we investigate
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Muhammad, Sulaiman. "Study on Porosity of Sediment Mixtures and a Bed-porosity Variation Model." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/57250.

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The sediment movement system in a river basin consists of sediment production process in the mountainous region, sediment supply process to the torrents and sediment deposition process in the lower reach and coastal area. There are human impacts as well as natural impacts in the system. These impacts affect the topographical feature and ecosystem in the basin including the coastal area. Bed variation model is one of the tools for assessing the topographical feature of river. In previous riverbed variation calculations, engineers or researchers conventionally assumed that the porosity in riverbed material is a constant, regardless of whether the grain sizes of the riverbed material was uniform. Since there is no doubt that the porosity depends on the grain sizes distribution, fixing the porosity at a constant value is inadequate for simulating practical sediment movements, such as the removal of fine materials out of the riverbed material or the deposition of fine material into voids between the coarse material. Voids in a riverbed themselves are also important as habitat for aquatic biota. Not only natural sediment transport phenomena, such as floods and debris flows induced by heavy rainstorms, but also artificial impacts, such as the construction of dams or sediment flushing from reservoirs, seriously affect the voids in the riverbed. So far no bed variation model has been available for the analysis of the change in porosity. As the void of bed material plays an important role in fluvial geomorphology, infiltration system in riverbeds and river ecosystem, a structural change of the void with bed variation is one of the concerned issues in river management. Thus, a bed-porosity variation model is strongly required and it is expected that the model contributes the analysis of those problems as a tool for integrated sediment management. The objectives of this work are: 1) to point out recent problems in a volcanic river basin, as well as the impacts on riverbed variation and ecosystem; the problems in Merapi volcano area and Progo River, Indonesia were chosen as case studies; 2) to develop a method for identifying the type of grain size distribution and two methods for obtaining the porosity for the different type of grain size distribution; 3) to develop a framework and a bed variation model available for the analysis of the change in porosity of bed material as well as the bed variation. The report consists of four subjects and organized into six chapters as shown in the diagram below (Figure 1). The following diagram shows the framework of proposed bed-porosity variation model and the correspondence of each chapter of this report. In Chapter 2, the sediment-related problems in volcanic area, particularly in Mt. Merapi and Progo River, Indonesia and the impacts on bed variation and ecosystem were pointed out. The sediment-related problems persist in the upper reach, middle reach, also in lower reach. Some problems are triggered by natural activities such as volcanic activity of Mt. Merapi and heavy rainfall, and many others are occurred due to the human interfere such as deforestation, construction of sabo dam and sand mining. Uncontrolled sand mining is the serious problem in this area. Those problems are increasing the susceptibility in the downstream and deteriorating the watershed. A flume experiment was conducted to realize the impact of mining pit on bed variation. Countermeasures of sediment problems, which have been done in Mt. Merapi area and Progo River, were also presented. Finally, the necessity of a tool for integrated sediment management in consideration of the ecosystem in river was indicated. In Chapter 3, the method for classifying and geometrically identifying the type of grain size distribution was presented. First, grain size distribution was classified into some typical types and those characteristic parameters were found out. Then a method for geometrically identifying the type of grain size distribution by using geometric indices .. and .. was presented. Based on the geometrical analysis of typical grain size distributions, a diagram on classification of grain size distribution type was indicated. The presented identification method was then applied to the natural grain size distribution data and the validity of the method was verified. In Chapter 4, two methods for estimating the porosity of sediment mixtures were presented. One was based on a particle packing simulation model and the other was based on a measurement method. The porosity of particle mixtures depends on not only the grain size distribution but also the compaction degree. However, the compaction degree could not be intentionally controlled in the model. Both of the methods were applied to estimate the porosity of three typical grain size distributions, namely lognormal distribution, modified-Talbot distribution and bimodal distribution. Particularly in the measurement, it was very difficult to mix the sediment evenly. Consequently, the coarser particle lies at higher position than the finer particle. This grading process made the porosity larger, while in the simulation the particles were mixed evenly. Thus, the particles packing in the simulation might be denser than the packing of particles in the measurement. The results showed that the relationship between grain size distribution and porosity could be determined by using the characteristic parameters of typical grain size distribution. This relation could be introduced into the bed variation model. In Chapter 5, a one dimensional bed-porosity variation model was developed for simulating the changes in porosity of bed material as well as the bed variation. Analytical model for binary mixtures with much different grain sizes and the relationship between the characteristic parameters of grain size distribution and porosity presented in Chapter 4 were introduced into the bed variation model. Two numerical methods were employed to solve the governing equations, i.e., standard successive approximation and MacCormack scheme. A flume experiment was conducted to realize the transformation processes of void structure for two conditions; one was the only fine sediment was removed from a sediment mixture and another was the fine sediment deposited into a coarser bed material. After the validity of the presented model was verified using a data set provided by the experiment, the model was applied to the bed and porosity variation process for bed material with binary mixtures and continuous grain size distribution. Its performance was examined in detail for two conditions; (1) no sediment supply condition and (2) sediment supply condition. The simulation results showed the model could produce a reasonable distribution of porosity of the riverbed material in the longitudinal and vertical directions for both conditions. A one-dimensional bed-porosity variation model proposed in this study is different from the previous model from a viewpoint of considering the porosity of bed material. Hence, the proposed model is available for the analysis of the change in porosity of bed material as well as the bed variation. The model contributes in two aspects; from the hydraulics point of view, the model provides an improvement of the accuracy in the riverbed variation calculation and from ecological point of view, the model provides the changes in porosity with the bed variation. In the case of binary mixtures, the validity of the model has been verified using a data set provided by the experiment and the simulation result showed that the model produced a reasonable result on the change in porosity as well as the bed variation. In the case of sediment mixtures with continuous grain size distribution, although the validity of the model has not been verified yet, the simulation result showed the model available for analysis of bed and porosity variation.
Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第13795号
工博第2899号
新制||工||1428(附属図書館)
26011
UT51-2008-C711
京都大学大学院工学研究科社会基盤工学専攻
(主査)教授 藤田 正治, 教授 中川 一, 教授 戸田 圭一
学位規則第4条第1項該当
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Lloyd, Gareth Owen. "Crystal engineering of porosity." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1087.

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Smith, Tabrina M. "Operator Ranges and Porosity." Kent State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=kent1215466700.

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Papa, Elettra <1987&gt. "Geopolymers with tailored porosity." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7431/1/Papa_Elettra_tesi.pdf.

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Geopolymers are synthetic materials formed by alkali-activation of aluminosilicate particles. They have attracted increasing attention as sustainable materials, being obtained from different raw materials, including industrial by-products, and by production processes at low temperature. Thanks to the good properties showed by these materials (thermal stability, fire-resistance, etc.), and the intrinsic mesoporosity, geopolymers have been studied as new materials for applications in many industrially relevant fields. To achieve full advantage of their porous structure, it is necessary to control its formation. The geopolymer production process in aqueous medium allows to tailor the porosity from nanometric to millimetric range since water acts as pore former. Moreover, ultra-macroporosity may be induced in the materials exploiting different techniques, commonly used for the production of porous ceramics, determining the possibility to obtain materials with different architectures, pore size and shape, etc. Hierarchical pore systems, where the mesopores of the geopolymer skeletal materials are directly connected to macro- and finally to ultra-macropores, may be constructed in this way. The main goal of this research project was to investigate the use of different process techniques applied to geopolymer matrices to generate porous structures characterized by peculiar porosities able to determine specific properties and functionalize the materials. In detail, the porosity was induced by direct foaming or addition of lightweight aggregates. Furthermore, geopolymers with main unidirectional anisotropic macropores were produced, for the first time, using a freeze-casting technique. All the materials produced were deeply investigated to optimize the production processes and evaluate the final properties, many of which arising from the intrinsic and induced porosity generated, in order to address the materials for potential applications as, for example, thermal insulating panels or heat transfer devices.
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Papa, Elettra <1987&gt. "Geopolymers with tailored porosity." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7431/.

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Geopolymers are synthetic materials formed by alkali-activation of aluminosilicate particles. They have attracted increasing attention as sustainable materials, being obtained from different raw materials, including industrial by-products, and by production processes at low temperature. Thanks to the good properties showed by these materials (thermal stability, fire-resistance, etc.), and the intrinsic mesoporosity, geopolymers have been studied as new materials for applications in many industrially relevant fields. To achieve full advantage of their porous structure, it is necessary to control its formation. The geopolymer production process in aqueous medium allows to tailor the porosity from nanometric to millimetric range since water acts as pore former. Moreover, ultra-macroporosity may be induced in the materials exploiting different techniques, commonly used for the production of porous ceramics, determining the possibility to obtain materials with different architectures, pore size and shape, etc. Hierarchical pore systems, where the mesopores of the geopolymer skeletal materials are directly connected to macro- and finally to ultra-macropores, may be constructed in this way. The main goal of this research project was to investigate the use of different process techniques applied to geopolymer matrices to generate porous structures characterized by peculiar porosities able to determine specific properties and functionalize the materials. In detail, the porosity was induced by direct foaming or addition of lightweight aggregates. Furthermore, geopolymers with main unidirectional anisotropic macropores were produced, for the first time, using a freeze-casting technique. All the materials produced were deeply investigated to optimize the production processes and evaluate the final properties, many of which arising from the intrinsic and induced porosity generated, in order to address the materials for potential applications as, for example, thermal insulating panels or heat transfer devices.
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Andres, Roxane Virginie. "Ars proteus. Fables et pratiques d’un design organoplastique." Thesis, Saint-Etienne, 2013. http://www.theses.fr/2013STET2169.

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Les porosités dont témoigne le design contemporain en font un champ ouvert où viennent s’imprimer et s’entrelacer les enjeux d’autres domaines, aujourd’hui prédominés par la science. Situé à la croisée des territoires, le designer exerce un art de la protéiformité — un ars proteus — révélant, par les objets qu’il conçoit, les métamorphoses et les questionnements que suscite la science — et plus particulièrement la médecine et ses conséquences sur une pensée du corps.Le design aurait-il le pouvoir de rendre visibles les enjeux les plus imperceptibles qui se trament à des échelles qui dépassent la mesure humaine ? Le design contemporain questionne l’échelle du corps dans les objets : peuvent-ils contribuer à faire émerger ou à matérialiser un imaginaire corporel que notre époque ferait subrepticement éclore ? L’organoplastie dans le design est cette possible formulation d’un glissement de territoire qui se produit entre le corps et l’objet, entre la genesis et la technè. Que cette organoplastie soit réelle (comme avec les objets à croissance spontanée de François Azambourg ou de Tobie Kerridge), ou bien métaphorique, elle engendre de nouvelles conceptions de l’objet mais aussi des moyens de production et de création, tout en accompagnant l’émergence d’un imaginaire biologique de nos artefacts. Le designer serait-il le pourvoyeur d’une seconde genèse, d’une néogenèse dont les formes organiques autonomes se constitueraient sur le modèle naturel de la croissance, donnant une nouvelle consistance à l’élaboration d’un monde artificiel ?
Porosity highlighted by the contemporary design makes of this one an open field where issues ofother areas, dominated by science, are intertwined. Placed at the crossroads of different territories, thedesigner creates a protean art- an ars proteus- revealing by the objects, the metamorphosis andproblematics elicited by science- and more particularly by medicine and its impact on our bodyconception.Could the design have the power to detect the most imperceptible issues which are plotted beyondhuman measure? The contemporary design questions the scale of the body in the objects: can itcontribute to show or materialize a body imaginary that our time would have secretly create?The organoplastie in design is a word which could express a sliding that occurs between the bodyand objects, between genesis and technè. The organoplastie, either real (like François Azambourg orTobie Kerridge's spontaneous growth objects) or metaphorical, generates new designs of the objectand, moreover, new ways of production and creation, while supporting the advent of a biologicalimaginary of our artifacts. Could the designer be the purveyor of a second genesis, or a neogenesiswhose autonomous organic forms would be based on the natural growth mode!, giving a newconsistencv in the development of an artificial world?
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Jackson, Paul. "Porosity and surfaces of coals." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.346450.

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Cheng, L. "Dual porosity reactive transport modeling." Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425583.

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Babic, Viktoria. "Increasing the porosity of zeolites." Thesis, Normandie, 2021. http://www.theses.fr/2021NORMC205.

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Les zéolites sont des catalyseurs industriels importants ; leur sélectivité basée sur la forme unique de leurs pores est à l’origine de plusieurs applications importantes. Cependant, la seule présence des micropores limitent le transport de réactifs et de produits et par la suite entrave l’efficacité de zéolites. Surmonter ou réduire les limitations de diffusion dans les zéolites est important pour améliorer leurs performances catalytiques et leurs capacités séparation. Le présent sujet de doctorat rapporte la préparation de zéolites avec une porosité accrue par la méthode de post-synthèse « etching ». Ce travail vise à créer une porosité secondaire (mésopores) liée à la microporosité native sans altération des propriétés intrinsèques de zéolites. Trois types de zéolites de différentes tailles de pores sont étudiés : petit pore SSZ-13 (CHA), pore moyen ZSM-5 (MFI) et grand pore zéolite L (LTL). L'étude de la Zéolite « L » consiste sur la comparaison des capacités de solutions NH4F et NH4HF2 dans la création des mésopores. Les résultats obtenus montrent que NH4F peut être remplacé par NH4HF2. L’utilisation des solutions de NH4HF2 à 1 et 2 % en masse aboutit à la création d’une (méso-) porosité similaire à celles obtenus avec des solutions de NH4F à 20 et 40 % en masse. Ainsi, en remplaçant NH4F par NH4HF2, on observe une diminution substantielle de la quantité de fluor utilisée. SSZ-13 est traité avec 40 % en masse de NH4F, ce qui a généré des mésopores dans tous les échantillons préparés. Les résultats obtenus révèlent que la génération de mésopores commence à partir de la surface du cristal, en raison des contraintes de diffusion d'ions bifluorure hydratés à travers les petits canaux de pores. Le traitement de zéolites de différentes tailles de pores (8, 10, 12 MR) avec l'acide chromique révèle que ce processus de dissolution dépend de la taille de l'ouverture des pores car les zéolithes à 8 MR et 10 MR sont plus résistantes au traitement à l'acide chromique qu’une zéolite à 12 MR. En général, l'acide chromique ne génère pas de mésopores substantielles. Le nombre de sites acides accessibles dans les dérivés obtenus par « etching » est proche de celui du matériau d'origine, bien qu'une certaine désalumination préférentielle soit observée
Zeolites are important industrial catalysts; their unique shape-selectivity is the basis of important applications, but also a pitfall limiting their efficiency. Overcoming or decreasing the diffusion limitations in zeolites is important to improve their catalytic and separation performance. The present Ph.D. thesis reports work on the preparation of zeolites with increased porosity via post-synthesis chemical etching. The work aims to create secondary porosity (mesopores) connected to the native microporosity without altering the intrinsic zeolite properties. Three zeolite types are studied: a small pore SSZ-13 (CHA), a medium pore ZSM-5 (MFI), and a large pore zeolite L (LTL). Zeolite L study compares the etching abilities of NH4F and NH4HF2 solutions in the hierarchization of zeolite L. The results show that NH4F can be replaced with NH4HF2. The etching with 1 and 2 wt/% NH4HF2 solutions yield hierarchical derivatives similar to those obtained with 20 and 40 wt/% NH4F solutions. Thus by replacing NH4F with NH4HF2 a substantial decrease in the used fluorine is achieved. SSZ-13 is etched with 40 wt/% NH4F, which generates mesopores in all prepared samples. The results reveal the mesopore generation starts from the crystal surface due to the constrained diffusion of hydrated bifluoride ions through the small pore channels. Chromic acid etching of zeolites with different pore opening (8, 10, 12 MR) reveals that this dissolution process is dependent on the size of the pore opening as 8 MR and 10 MR zeolites are more resistant to etching with chromic acid than 12 MR zeolite. In general, the chromic acid does not generate substantial mesopore formation. The number of accessible acid sites in etched derivatives is close to the parent material, although some preferential dealumination is observed
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Books on the topic "Porosity"

1

Joardder, Mohammad U. H., Azharul Karim, Chandan Kumar, and Richard J. Brown. Porosity. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23045-0.

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Holl, Steven. Steven Holl: Luminosity/porosity. Tokyo: Tōtōshuppan, 2006.

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Lowell, S., and Joan E. Shields. Powder Surface Area and Porosity. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7955-1.

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Generazio, Edward R. Dynamic porosity variations in ceramics. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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Lowell, S. Powder surface area and porosity. 3rd ed. London: Chapman & Hall, 1991.

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Straughan, Brian. Mathematical Aspects of Multi–Porosity Continua. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70172-1.

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W, Patrick John, ed. Porosity in carbons: Characterization and applications. London: Edward Arnold, 1995.

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W, Patrick John, ed. Porosity in carbons: characterization and applications. New York: Halsted Press, 1995.

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A, Budd David, Saller Arthur H, and Harris Paul M. 1949-, eds. Unconformities and porosity in carbonate strata. Tulsa, Okla: American Association of Petroleum Geologists, 1995.

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Vansant, E. F. Pore size engineering in zeolites. Chichester: J. Wiley & Sons, 1990.

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Book chapters on the topic "Porosity"

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Joardder, Mohammad U. H., Azharul Karim, Chandan Kumar, and Richard J. Brown. "Introduction." In Porosity, 1–3. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23045-0_1.

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Joardder, Mohammad U. H., Azharul Karim, Chandan Kumar, and Richard J. Brown. "Food as a Material." In Porosity, 5–13. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23045-0_2.

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Joardder, Mohammad U. H., Azharul Karim, Chandan Kumar, and Richard J. Brown. "Pore Formation and Evolution During Drying." In Porosity, 15–23. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23045-0_3.

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Joardder, Mohammad U. H., Azharul Karim, Chandan Kumar, and Richard J. Brown. "Factors Affecting Porosity." In Porosity, 25–46. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23045-0_4.

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Joardder, Mohammad U. H., Azharul Karim, Chandan Kumar, and Richard J. Brown. "Effect of Porosity on Drying Kinetics and Food Properties." In Porosity, 47–64. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23045-0_5.

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Joardder, Mohammad U. H., Azharul Karim, Chandan Kumar, and Richard J. Brown. "Relationship Between Drying Conditions, Pore Characteristics, and Food Quality." In Porosity, 65–68. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23045-0_6.

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Gooch, Jan W. "Porosity." In Encyclopedic Dictionary of Polymers, 578. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9296.

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Ganat, Tarek Al-Arbi Omar. "Porosity." In Fundamentals of Reservoir Rock Properties, 5–24. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-28140-3_2.

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Danielson, R. E., and P. L. Sutherland. "Porosity." In SSSA Book Series, 443–61. Madison, WI, USA: Soil Science Society of America, American Society of Agronomy, 2018. http://dx.doi.org/10.2136/sssabookser5.1.2ed.c18.

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Giao, Pham Huy, and Pham Huy Nguyen. "Porosity." In Encyclopedia of Mathematical Geosciences, 1–5. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-26050-7_252-1.

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Conference papers on the topic "Porosity"

1

Zhang, J. J., G. Z. Zhang, and F. He. "Multiple-porosity Variable Critical Porosity Model." In 77th EAGE Conference and Exhibition 2015. Netherlands: EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201412950.

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Eskelinen, J., H. Hoffrén, T. Kohout, E. Hæggström, and L. J. Pesonen. "Ultrasonic Porosity Estimation of Low-Porosity Ceramic Samples." In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION. AIP, 2007. http://dx.doi.org/10.1063/1.2718118.

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Dvorkin, Jack, and Ivar Brevik. "Diagnosing high‐porosity sandstones: Permeability from porosity and velocity." In SEG Technical Program Expanded Abstracts 1997. Society of Exploration Geophysicists, 1997. http://dx.doi.org/10.1190/1.1886146.

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Zhang*, Jiajia, Hongbing Li, Guangzhi Zhang, and Feng He. "A new critical porosity model for multiple-porosity rock." In SEG Technical Program Expanded Abstracts 2015. Society of Exploration Geophysicists, 2015. http://dx.doi.org/10.1190/segam2015-5890025.1.

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Soerensen*, Morten Kanne, and Ida Lykke Fabricius. "Fluid substitution in sandstone: Effective porosity or total porosity." In SEG Technical Program Expanded Abstracts 2015. Society of Exploration Geophysicists, 2015. http://dx.doi.org/10.1190/segam2015-5921081.1.

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Wempe, Wendy, and Gary Mavko. "Effective porosity‐total porosity model applied to fontainebleau sandstone." In SEG Technical Program Expanded Abstracts 2002. Society of Exploration Geophysicists, 2002. http://dx.doi.org/10.1190/1.1817053.

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Loures, Luiz G., and Fernando Moraes. "Reservoir porosity inference." In SEG Technical Program Expanded Abstracts 2002. Society of Exploration Geophysicists, 2002. http://dx.doi.org/10.1190/1.1817036.

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Coats, K. H. "Implicit Compositional Simulation of Single-Porosity and Dual-Porosity Reservoirs." In SPE Symposium on Reservoir Simulation. Society of Petroleum Engineers, 1989. http://dx.doi.org/10.2118/18427-ms.

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Zhang*, Jiajia, Hongbing Li, Guangzhi Zhang, and Feng He. "Pore structure characterization based on multiple-porosity variable critical porosity model." In SPG/SEG 2016 International Geophysical Conference, Beijing, China, 20-22 April 2016. Society of Exploration Geophysicists and Society of Petroleum Geophysicists, 2016. http://dx.doi.org/10.1190/igcbeijing2016-129.

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JAGTOYEN, MARIT, JAMES PARDUE, TERRY RANTELL, and FRANK DERBYSHIRE. "POROSITY OF CARBON NANOTUBES." In Proceedings of the Second Pacific Basin Conference. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793331_0058.

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Reports on the topic "Porosity"

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Katsube, T. J., and N. Scromeda. Effective Porosity Measuring Procedure For Low Porosity Rocks. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132655.

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Issler, D. R. Shale porosity-depth curves. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207703.

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Ningthoujam, J., J. K. Clark, T. R. Carter, and H. A. J. Russell. Investigating borehole-density, sonic, and neutron logs for mapping regional porosity variation in the Silurian Lockport Group and Salina Group A-1 Carbonate Unit, Ontario. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332336.

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Abstract:
The Oil, Gas and Salt Resources Library (OGSRL) is a repository for data from wells licenced under the Oil, Gas and Salt Resources Act for Ontario. It has approximately 50,000 porosity and permeability drill core analyses on bedrock cores. It also has in analogue format, geophysical logs (e.g., gamma ray, gamma-gamma density, neutron, sonic) from approximately 20,000 wells. A significant challenge for geotechnical and hydrogeological studies of the region is the accessibility of digital data on porosity and permeability. Recent work completed on approximately 12,000 core analyses for the Silurian Lockport Group and Salina Group A-1 Carbonate Unit are geographically concentrated within productive oil and gas pools. An opportunity therefore exists to expand the bedrock porosity characterization for southern Ontario by using geophysical logs collected in open-hole bedrock wells that are more geographically dispersed. As part of this study, hard copy files of analog geophysical logs are converted to digital data (LAS format), followed by quality assessment and quality control (QAQC) to obtain meaningful results. From the digitized geophysical data, density, neutron, and sonic logs are selected to mathematically derive porosity values that are then compared with the corresponding measured core porosity values for the same depth interval to determine the reliability of the respective log types. In this study, a strong positive correlation (R²=0.589) is observed between porosity computed from a density log (density log porosity) and the corresponding core porosity. Conversely, sonic log porosity and neutron porosity show weak (R2 = 0.1738) and very weak (R2 = 0.0574) positive correlation with the corresponding core porosity data. This finding can be attributed to different factors (e.g., the condition of the borehole walls and fluids, the type and limitations of the technology at different points in time, knowledge of formation variability for calculations), and as such requires more investigation. The density log measures the bulk density of the formation (solid and fluid phases), and as such the derived porosity values indicate total porosity i.e., interparticle (primary) pore spaces, and vugs and fractures (secondary) pore spaces. The sonic log measures the interval transit time of a compressional soundwave travelling through the formation. High quality first arrival waveforms usually correspond to a route in the borehole wall free of fractures and vugs, which ultimately result in the derived porosity reflecting only primary porosity. As molds, vugs and fractures contribute significantly to the total porosity of the Lockport Group and Salina A-1 Carbonate strata, sonic porosity may not reflect true bulk formation porosity. The neutron porosity log measures the hydrogen index in a formation as a proxy for porosity, however, the current limitations of neutron logging tool fail to account for formation-related complexities including: the gas effect, the chloride effect and the shale effect that can lead to over- or underestimation of formation porosity. As a result, the density log appears to be the most reliable geophysical log in the OGSRL archives for total porosity estimation in the Lockport Group and Salina A-1 Carbonate Unit. Nonetheless, sonic porosity can be combined with density porosity to determine secondary porosity, whereas a combination of density and neutron porosity logs can be used to identify gas-bearing zones.
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Best, Cody, Carl Hart, and Christopher Donnelly. Porosity measurement device design and analysis. Engineer Research and Development Center (U.S.), June 2024. http://dx.doi.org/10.21079/11681/48651.

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Porosity measurements are necessary to fully characterize the acoustic properties of a porous material. Many methods exist to measure porosity with various limitations. This report details a system based on previous work to limit environmental effects on measurements.
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Zimmerman, A. H., and G. A. To. Porosity Characteristics of Nickel Sinter. Fort Belvoir, VA: Defense Technical Information Center, February 2005. http://dx.doi.org/10.21236/ada430971.

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Harbour, J., V. Vickie Williams, T. Tommy Edwards, R. Russell Eibling, and R. Ray Schumacher. SALTSTONE VARIABILITY STUDY - MEASUREMENT OF POROSITY. Office of Scientific and Technical Information (OSTI), August 2007. http://dx.doi.org/10.2172/913452.

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7

Calo, J. M., L. Zhang, and W. D. Lilly. Characterization of porosity via secondary reactions. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/6746133.

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Calo, J. M. Characterization of porosity via secondary reactions. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/7033640.

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Calo, J. M., and W. D. Lilly. Characterization of porosity via secondary reactions. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5601567.

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Calo, J. M., L. Zhang, and W. D. Lilly. Characterization of porosity via secondary reactions. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/6938624.

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