Relevant bibliographies by topics / BET isotherm

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Academic literature on the topic 'BET isotherm'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "BET isotherm"

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Cascarini de Torre, Lydia Ethel, and Eduardo Jorge Bottani. "BET Adsorption Isotherm and Surface Heterogeneity." Collection of Czechoslovak Chemical Communications 57, no. 6 (1992): 1201–9. http://dx.doi.org/10.1135/cccc19921201.

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The BET adsorption isotherm is modified in order to take account of surface heterogeneity. The adsorption isotherm is obtained following the statistical mechanics formalism, proposed by Steele, and the effect of surface heterogeneity is limited to the first layer. A Gaussian adsorption energies distribution function is used to describe surface heterogeneity. The variations of the C parameter, multilayer formation and the inversion of adsorption isotherms are analysed.
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Agarwal, Ajay K., Mahendra S. Kadu, Chandrashekhar P. Pandhurnekar, and Ishwardas L. Muthreja. "Equilibrium isotherm studies for the sorption of Nickel ions onto coal fly ash." Environment Conservation Journal 15, no. 1&2 (June 18, 2014): 153–59. http://dx.doi.org/10.36953/ecj.2014.151220.

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The objective of the present study was to study equilibrium isotherm for the sorption of Nickel ions onto coal fly ash. In this study, BET adsorption isotherm was found to be best fitted among Langmuir, Freundlich, BET, Temkin and Harkins Jura adsorption isotherms using lest square fit method. The best fit adsorption isotherm is assessed by the linear coefficient of determination (R2) and non-linear Chi-square test. The theoretical value of qe calculated from the best fit linear equation of each adsorption isotherm and the experimental values of qe (0.08) are plotted against Ce, to compare the experimental and Theoretical value of qe.
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Rachtanapun, Pornchai, and R. Suriyatem. "Prediction Models for Moisture Sorption Isotherms of Soy Protein Isolate/Carboxymethyl Chitosan/Oleic Acid Blend Films." Advanced Materials Research 506 (April 2012): 595–98. http://dx.doi.org/10.4028/www.scientific.net/amr.506.595.

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Soy protein isolate/carboxymethyl chitosan/oleic acid (SPI/CMCH/O) blend films were prepared by solution casting. The effect of various oleic acid content (0, 2.5, 5.0, 10.0, 20.0 pph of SPI and CMCH) on water sorption isotherm of SPI/CMCH base film was investigated. The sorption isotherm of SPI/CMCH/O blend films was evaluated at serveral relative humidity (0, 16, 35, 55 and 76% RH), at 25±1°C. The isotherms showed equilibrium moisture content (%EMC) of SPI/CMCH/O blend films decreased when oleic acid content increased. Understanding of sorption isotherms is an importance for prediction of moisture sorption properties of films via moisture sorption empirical models. Guggenheim-Anderson-de Boer (GAB), BrunauerEmmettTeller (BET) and Oswin sorption models were tested to fit the experimental data. The root mean squares (RMS) of GAB, BET and Oswin were in the range of 68.60-87.02, 22.86-79.38 and 694.78-3797.23, respectively. BET model was found to be the better-fitted model for SPI/CMCH/O blend films at 25±1°C.
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Yu, Wei, Kamy Sepehrnoori, and Tadeusz W. Patzek. "Modeling Gas Adsorption in Marcellus Shale With Langmuir and BET Isotherms." SPE Journal 21, no. 02 (April 14, 2016): 589–600. http://dx.doi.org/10.2118/170801-pa.

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Summary Production from shale-gas reservoirs plays an important role in natural-gas supply in the United States. Horizontal drilling and multistage hydraulic fracturing are the two key enabling technologies for the economic development of these shale-gas reservoirs. It is believed that gas in shale reservoirs is mainly composed of free gas within fractures and pores and adsorbed gas in organic matter (kerogen). It is generally assumed in the literature that the monolayer Langmuir isotherm describes gas-adsorption behavior in shale-gas reservoirs. However, in this work, we analyzed four experimental measurements of methane adsorption from the Marcellus Shale core samples that deviate from the Langmuir isotherm, but obey the Brunauer-Emmett-Teller (BET) isotherm. To the best of our knowledge, it is the first time to find that methane adsorption in a shale-gas reservoir behaves similar to multilayer adsorption. Consequently, investigation of this specific gas-desorption effect is important for accurate evaluation of well performance and completion effectiveness in shale-gas reservoirs on the basis of the BET isotherm. The difference in calculating original gas in place (OGIP) on the basis of both isotherms is discussed. We also performed history matching with one production well from the Marcellus Shale and evaluated the contribution of gas desorption to the well's performance. History matching shows that gas adsorption obeying the BET isotherm contributes more to overall gas recovery than gas adsorption obeying the Langmuir isotherm, especially at early time in production. This work provides better understanding of gas desorption in shale-gas reservoirs and updates our current analytical and numerical models for simulation of shale-gas production.
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Suriyatem, Rungsiri, and Pornchai Rachtanapun. "Prediction Modeling for Moisture Sorption Isotherms of Rice Starch/Carboxymethyl Cellulose from Durian Rind Blend Films." Applied Mechanics and Materials 431 (October 2013): 32–36. http://dx.doi.org/10.4028/www.scientific.net/amm.431.32.

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Rice starch/carboxymethyl cellulose from durian rind (RS/CMCd) blend films were prepared by solution casting. The effect of different ratios between rice starch and CMCd (100:0, 88:12, 67:33, 50:50, 33:67, 12:88 and 0:100) on moisture sorption isotherm of blend films was investigated. The sorption isotherm of RS/CMCd blend films was determined at various relative humidity (RH) at 25°C. The isotherm curves revealed that the highest equilibrium moisture content (EMC) was obtained from CMCd film, at aw=85. Knowledge of sorption isotherms is important to predict the moisture sorption properties of the filmsviamoisture sorption empirical models. The Lewicki, Peleg, Guggenheim-Anderson-deBoer (GAB), BrunauerEmmettTeller (BET), and Oswin models were tested to fit the experimental data. The root mean squares percentage error (%RMS) of Lewicki, Peleg, GAB, BET and Oswin was in the range of 5.3-83.1, 2.2-20.0, 6.9-20.2, 3.4-26.4 and 4.7-41.2, respectively. The Peleg model was found to be the best fitted model for RS/CMCd blend films.
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Bakaev, V. A., and W. A. Steele. "The Characteristic Curve in Physical Adsorption." Adsorption Science & Technology 10, no. 1-4 (March 1993): 123–36. http://dx.doi.org/10.1177/0263617499010001-411.

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The concept of the characteristic curve in physical adsorption and the rule of its temperature invariance is traced from the potential theory of adsorption by Polanyi to the Frenkel–Halsey–Hill equation, the theory of volume filling of micropores by Dubinin et al. and the theory of adsorption on heterogeneous surfaces. A computer simulation of an irregular atomic configuration at the surface of amorphous carbon is presented. In the submonolayer region, the isotherms of argon adsorption simulated on that surface are shown to correspond to the Freundlich equation and are close to the experimental isotherms on a diamond dust sample. Simulated isosteric heats of adsorption are also reasonably close to the experimental data for argon on a real carbon black. The BET C constant for the simulated isotherm is lower than for the real isotherm on untreated carbon black. However, the isotherms at two temperatures can be described by one absolute isotherm of adsorption.
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Chen, Qing, Yuanyuan Tian, Peng Li, Changhui Yan, Yu Pang, Li Zheng, Hucheng Deng, Wen Zhou, and Xianghao Meng. "Study on Shale Adsorption Equation Based on Monolayer Adsorption, Multilayer Adsorption, and Capillary Condensation." Journal of Chemistry 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/1496463.

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Shale gas is an effective gas resource all over the world. The evaluation of pore structure plays a critical role in exploring shale gas efficiently. Nitrogen adsorption experiment is one of the significant approaches to analyze pore size structure of shale. Shale is extremely heterogeneous due to component diversity and structure complexity. Therefore, adsorption isotherms for homogeneous adsorbents and empirical isotherms may not apply to shale. The shape of adsorption-desorption curve indicates that nitrogen adsorption on shale includes monolayer adsorption, multilayer adsorption, and capillary condensation. Usually, Langmuir isotherm is a monolayer adsorption model for ideal interfaces; BET (Brunauer, Emmett, Teller) adsorption isotherm is a multilayer adsorption model based on specific assumptions; Freundlich isotherm is an empirical equation widely applied in liquid phase adsorption. In this study, a new nitrogen adsorption isotherm is applied to simultaneously depict monolayer adsorption, multilayer adsorption, and capillary condensation, which provides more real and accurate representation of nitrogen adsorption on shale. In addition, parameters are discussed in relation to heat of adsorption which is relevant to the shape of the adsorption isotherm curve. The curve fitting results indicate that our new nitrogen adsorption isotherm can appropriately describe the whole process of nitrogen adsorption on shale.
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Smith, Kyla, Xiaodan Zhang, and Ron Hofmann. "Assessment of alternate characterization tests for prediction of taste and odour control by granular activated carbon." Water Supply 12, no. 4 (July 1, 2012): 531–39. http://dx.doi.org/10.2166/ws.2012.026.

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The acetoxime number test was recently identified by the American Society for Testing and Materials as a method to characterize activated carbon. This adsorption isotherm gives information about the number of high energy adsorption sites on the surface of an activated carbon. A similar test uses tetrafluoromethane for the same purpose. In contrast, the more common iodine number and Brunauer, Emmet and Teller (BET) surface area parameters are a measure of the total number of adsorption sites. 2-Methylisoborneol (MIB) is reported to require high energy sites for removal, so it was hypothesized that data from acetoxime and tetrafluoromethane isotherm tests for different activated carbons would be better correlated to MIB removal than iodine numbers or BET surface areas. MIB breakthrough was monitored in rapid small-scale column tests (RSSCTs) using four natural waters and five activated carbons. Results showed no correlation between acetoxime or tetrafluoromethane isotherms and MIB breakthrough.
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Mashile, Geaneth Pertunia, Kgokgobi Mogolodi Dimpe, and Philiswa Nosizo Nomngongo. "A Biodegradable Magnetic Nanocomposite as a Superabsorbent for the Simultaneous Removal of Selected Fluoroquinolones from Environmental Water Matrices: Isotherm, Kinetics, Thermodynamic Studies and Cost Analysis." Polymers 12, no. 5 (May 12, 2020): 1102. http://dx.doi.org/10.3390/polym12051102.

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The application of a magnetic mesoporous carbon/β-cyclodextrin–chitosan (MMPC/Cyc-Chit) nanocomposite for the adsorptive removal of danofloxacin (DANO), enrofloxacin (ENRO) and levofloxacin (LEVO) from aqueous and environmental samples is reported in this study. The morphology and surface characteristics of the magnetic nanocomposite were investigated by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption–desorption and Fourier transform infrared spectroscopy (FTIR). The N2 adsorption–desorption results revealed that the prepared nanocomposite was mesoporous and the BET surface area was 1435 m2 g−1. The equilibrium data for adsorption isotherms were analyzed using two and three isotherm parameters. Based on the correlation coefficients (R2), the Langmuir and Sips isotherm described the data better than others. The maximum monolayer adsorption capacities of MMPC/Cyc-Chit nanocomposite for DANO, ENRO and LEVO were 130, 195 and 165 mg g−1, respectively. Adsorption thermodynamic studies performed proved that the adsorption process was endothermic and was dominated by chemisorption.
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Bağcı, Safiye, and Ayhan Ceyhan. "Adsorption of methylene blue onto activated carbon prepared from Lupinus Albus." Chemical Industry and Chemical Engineering Quarterly 22, no. 2 (2016): 155–65. http://dx.doi.org/10.2298/ciceq150522030b.

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The adsorption of methylene blue (MB) from synthetic aqueous solutions in batch experiments using Lupinus Albus-activated carbon (LAAC) by chemical activation with zinc chloride was investigated. Prior to adsorption experiments, surface/physical properties of LAAC were determined using Scanning Electron Microscopy, Fourier transform infrared Spectroscopy and nitrogen adsorption isotherm. In the adsorption experiments, effects of adsorption time, solution pH, MB concentration and amount of LAAC were investigated. The isotherm and kinetic parameters were used to describe the experimental data. The BET surface area was 1254 m2/g while its total pore volume was found to be 0.484 cm3/g. Maximum adsorption capacity occurred at solution pH value 10 and was recorded as 109.89 mg/g. Adsorption data were modeled using Langmuir, Freundlich and Temkin adsorption isotherms. Langmuir isotherm and pseudo-second-order models fit to the process and reaction kinetics correspondingly.
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Dissertations / Theses on the topic "BET isotherm"

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Borsato, Francimeiri Piva. "Avaliação do mecanismo de adsorção do metronidazol em carvão ativado da casca do coco babaçu." Universidade Estadual do Oeste do Paraná, 2018. http://tede.unioeste.br/handle/tede/3988.

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Made available in DSpace on 2018-10-26T00:04:37Z (GMT). No. of bitstreams: 1 Francimeiri_Borsato_2018.pdf: 2616199 bytes, checksum: 0597ddbb345dfc4d204c2b2092f5ee59 (MD5) Previous issue date: 2018-07-25
This work has evaluated the adsorption capability of three coal produced in the Universidade Estadual do Oeste do Paraná (tilapia bone residual coal, soybean bark coal and chestnut from Pará) and other kind of coal commercially obtained (babaçu coconut pealing coal) to remove the metronidazole from aqueous solution. The coal which better absorbed the metranidazole was the babaçu coconut peal one (CCCB) with temperature from 40ºC, 150 rpm of stirring and with no pH adjustment. Thus, the kinetic tests were performed by using the SOTAX dissolution apparatus, with 1000 mL of metronidazole solution, varying the concentration (200, 400, 650 and 850 mg/ L) and the temperature (30, 40, 45ºC), 1 g of the coal and 150 rpm of stirring. The equilibrium time observed was around 20 hours and in the first 4 hours a bigger amount of metranidazole was adsorbed, this inicial amount corresponds to the metranidazole adsorption in the outer layer of the CCCB. The results obtained from the adsorption kinetics were described by the intraparticule diffusion in which were verified the appearing of four well defined regions corresponding to the adsorption in the outer layer, in the macropores, in the CCCB mesopores and the equilibrium, respectively. In the equilibrium studies, were presented two adsorption mechanisms: monolayer and multilayer with increasing concentration of the adsorbate, corresponding to the hybrid model of Langmuir + BET. The removing process of metranidazole by using CCCB became economically viable due to the low cost in the obtention or production of the adsorbent, the easily extracetion of the babaçu coconut biomass and the excellent capability of maximum adsorptive to the metranidazole.
Neste trabalho, avaliou-se a capacidade de adsorção de três carvões produzidos na Universidade Estadual do Oeste do Paraná (carvão do resíduo ósseo de tilápia, carvão da casca da soja e o carvão da casca da castanha do Pará) e um carvão obtido comercialmente (carvão da casca do coco babaçu) para remoção do antibiótico metronidazol de solução aquosa. O carvão que melhor adsorveu o metronidazol foi o carvão da casca do coco babaçu (CCCB) com temperatura de 40ºC, 150 rpm de agitação e sem ajuste de pH. Dessa forma, os testes cinéticos foram realizados com o auxílio de um dissolutor (Sotax), utilizando 1000 mL de solução de metronidazol, variando a concentração (200, 400, 650 e 850 mg L-1) e a temperatura (30, 40 e 45ºC), 1 g do carvão e 150 rpm de agitação. O tempo de equilíbrio observado foi de aproximadamente 20 horas e nas primeiras 4 horas uma maior quantidade de metronidazol foi adsorvida, essa quantidade inicial corresponde à adsorção do metronidazol na camada externa do CCCB. Os dados obtidos a partir da cinética de adsorção foram descritos pelo modelo de difusão intrapartícula, no qual verificou-se o aparecimento de quatro regiões bem definidas correspondendo respectivamente a adsorção na camada externa, nos macroporos, nos mesoporos do CCCB e por último o equilíbrio. No estudo de equilíbrio, apresentou dois mecanismos de adsorção: monocamada e multicamadas com o aumento da concentração do adsorvato, correspondendo ao modelo híbrido de Langmuir+ BET. O processo de remoção de metronidazol utilizando o CCCB é economicamente viável visto o baixo custo na obtenção ou fabricação do adsorvente por ser extraído da biomassa do coco babaçu, além de possuir uma excelente capacidade máxima adsortiva para o antibiótico estudado.
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Houssein, Taher Ahmad. "Water Sorption Isotherms Of Libyan Date Paste." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608276/index.pdf.

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water sorption isotherms of destoned and ground saiadey Jaul type dates were obtained at 30,40.50 C.using the gravimetric methods.Data were analyzed by applying the GAB,BAT ,Smith,Iglesias and Chrife,Halsey ,Henderson and Oswin Models.Isosteric heat of sorption value was calculated using the Clausius-Clapeyron Equation and tried to be as afunction of moisture content of dates. It was found that the experimental data fitted well to ,smith ,I glesias and Chirife ,Halsey, Henderson and Oswin equation, which are suitable for high sugar foods.Isosteric heat of sorption for dates varied from 0,9 to - 1,84 KJ/mol as moisture content changed from 11,0 to 18,0%.
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Chang, Hui. "Transformations de phase et évolutions des microstructures dans l'alliage de titane beta Ti-B19." Thesis, Vandoeuvre-les-Nancy, INPL, 2010. http://www.theses.fr/2010INPL053N/document.

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Les évolutions de microstructures du nouvel alliage chinois Ti B19 ont été étudiées au cours de divers traitements thermiques et des relations entre microstructures et propriétés mécaniques ont été établies. Les cinétiques de transformations isothermes ont été établies par des mesures de résistivité électrique. Les structures et microstructures ont été caractérisées par DRX synchroton, Microscopies Optiques et Electroniques (MEB, MET). Les cinétiques de transformation et les caractéristiques microstructurales. Les cinétiques de transformation isothermes ont été obtenues, analysées (loi JMAK), et cet ensemble de résultats a conduit à l'établissement du diagramme TTT de l'alliage TiB19. Enfin il a été montré que la vitesse de chauffage a une très forte influence sur les transformations mises en jeu, et qu'une pré déformation plastique accélère les cinétiques de transformation (introduction de nouveaux sites de germination). Enfin les cinétiques de transformation ont été caractérisées en refroidissement continu depuis le domaine monophasé bêta. Une première approche de la modélisation des cinétiques de transformation a été menée en utilisant le loi JMAK et le principe d'additivité de Scheil. Enfin les relations entre microstructures et propriétés sont discutés
The phase transformations and microstructure evolutions has been characterized for different thermal treatments, and the relationships between final microstrures and properties have been investigated in the new metastable Ti-B19 alloy. The isothermal phase transformation kinetics and the influence of different heat treatment phaths have been establisheb by using in-situ electrical Resistivity. The structures have been determined by synchrotron X-Ray Diffraction and the microstructures were observed by SEM and TEM. The results show that phase transformation kinetics and microstructure characteristics are strongly dependent on the aging temperature (ranging from 300 to 700°C). The global isothermal phase transformation phase transformation kinetics has been got and anallyzed with JMAK equation, and the TTT diagram of Ti-B19 alloy has been established. We have also shown that the heating rate has remarkable influence on the isothermal phase transformation behaviors and the pre-deformation accelerates the transformation kinetics. The microstructure evolutions during cooling are obviously dependent on the cooling rates. A first attempt has been made to calculate the transformation kinetics during cooling using JMAK law and Scheil principle. Finally, the relationship between mechanical properties and microstructure has been discussed
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Biggs, Georgina Aimee. "The Onsager heat of transport at the liquidvapour interface of p-tert-butyltoluene." Thesis, University of Canterbury. Chemistry, 2007. http://hdl.handle.net/10092/1386.

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The Onsager heat of transport for p-tert-butyltoluene was measured, as part of a series of preliminary experiments towards the determination of the importance of temperature gradients on the air-sea flux of carbon dioxide. The results presented in this thesis imply that the temperature gradient is a major contributor to the magnitude of the air-sea flux. The heat of transport has been measured for the p-tert-butyltoluene system by measuring stationary-state pressure changes for known temperature differences on the vapour side of the interface. At the pressure ranges used the number of mean free paths was always outside the Knudsen zone, but the values of Q* were approximately 100 % of the latent heat of vaporisation. Departures from linearity of plots of P against ΔT are attributed to temperature jumps at the surface of the dry upper plate. Both the results taken for p-tert-butyltoluene and the earlier results for water from this laboratory fit to a Type III BET isotherm, where the c parameter is not constant. They also reveal the importance of the temperature gradient in determining the value of the thermal accommodation coefficient, and provide a new method of measuring thermal accommodation coefficients for a variety of surfaces and vapours
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Heckel, Thomas. "Isotherme und thermomechanische Ermüdung von Titanlegierungen Vergleich einer kommerziellen {near-[alpha]-Legierung [near-alpha-Legierung] mit einer TiAl-Legierung der 3. Generation." Aachen Shaker, 2009. http://d-nb.info/999731289/04.

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Yeboah, Siegfried Kwame. "An integrated packed bed-oscillating heat pipe system for energy efficient isothermal adsorption processes." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/48342/.

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Energy use in buildings accounts for a large portion of global and regional energy demand and energy-related CO2 emissions. To steer the world towards a low carbon future, the development of new and more efficient technologies is required. In hot and humid climates, the high latent heat loads results in uncomfortable and unhealthy indoor environments, accounting for 30% to 50% of standard air conditioning energy requirements. Physical adsorption of water vapour on solid desiccants is found to offer an energy efficient alternative to conventional dehumidification process using standard air conditioning systems. However, the isosteric heat of adsorption released increases the surface vapour pressure of the solid desiccants resulting in a decreased adsorption capacity. In packed beds of solid desiccants, this heat of adsorption increases the bed temperature, exit air temperature and exit air humidity ratio subsequently imposing an increased cooling load requirement and high energy requirement in the regeneration of the solid desiccants. In literature, several approaches used in removing in situ the heat of adsorption released in packed bed systems were fraught with several limitations. To this end, an integrated packed bed-oscillating heat pipe (OHP) system was proposed. The concept was for the evaporator of the OHP to remove the heat of adsorption generated by the packed bed and reject at its condenser towards an energy efficient isothermal adsorption process. To achieve this, theoretical investigations of the individual systems and the integrated systems preceded experimental testing of a rig set up in the laboratory. For the theoretical studies, the OHP was helically coiled at both ends, filled with ethanol, methanol and water working fluids respectively at 50% volume fraction and numerically investigated using the Eulerian Volume of Fluid (VOF) model in ANSYS Fluent R15.0. The packed bed on the other hand was configured as a Heggs et al (1994) Z-type flow arrangement for enhanced radial flow using the Porous Media model in ANSYS Fluent R15.0 set up with the properties of Silica Gel. ANSYS Fluent R15.0 System Coupling limitations led to the development of mathematical models for the prediction of the integrated system performance. The experimental investigations were in line with the theoretical only in this case the optimum working fluid, deionized water, was used as the main working fluid in the helically coiled OHP (HCOHP). The results showed reasonable agreement between the performance of the numerical model and experimental prototype. The HCOHPs were capable of passively removing heat from the packed bed systems. Mean bed temperature reduction between the integrated packed bed-HCOHP system and corresponding individual packed bed configurations were about 5.61°C, 9.48°C and 10.14°C respectively for the large annulus (LAPB), medium annulus (MAPB) and small annulus (SAPB) packed bed configurations. Average packed bed outlet temperature reductions of about 6.61°C, 9.19°C and 6.29°C were also achieved for the respective configurations. A validation of the theoretical model showed average temperature difference of about 5.60°C between the experimental prototype of the integrated system and results predicted using experimental packed bed temperature data and HCOHP thermal resistance. Compared to other similar systems in literature, the integrated packed bed-HCOHP system showed capacity to passively remove significant amounts of the heat of adsorption released in silica gel packed beds towards isothermal adsorption.
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Martínez, del Álamo Manuel. "Numerical study of isothermal two-phase flow dispersion in the packed bed of a hydrodesulfurization reactor." Doctoral thesis, Universitat Rovira i Virgili, 2011. http://hdl.handle.net/10803/51766.

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El objetivo principal de este trabajo es predecir la dispersión de un flujo bifásico en el lecho de un reactor de hidrodesulfuración. Se consideran propiedades físicas constantes, sin incluir reacciones químicas ni procesos de transferencia de calor ni materia. Dos herramientas de simulación diferentes se han utilizado en este estudio. Una de ellas es el software comercial Fluent, ampliamente utilizado en el campo de la Computación en Dinámica de Fluidos, en el que se han introducido nuevos modelos de arrastre y capilaridad no incluidos en la versión comercial del software. La segunda herramienta utilizada es el código doméstico Multiphase Flow Solver, escrito en lenguaje de programación Fortran, que ha sido desarrollado durante esta tesis doctoral, constituyendo un importante objetivo de la misma. Este código incorpora los modelos necesarios para describir los procesos físicos que describen el comportamiento de este tipo de flujos multifásicos y su dispersión en medios porosos.
The main objective of this work is to predict the two-phase flow dispersion in the bed of a hydrodesulfurization reactor. Physical properties are considered to remain constant, without including chemical reactions nor heat and mass transfer processes. Two different simulation tools have been used in this study. One of them is the commercial software Fluent, widely used in the field of Computational Fluid Dynamics, in which new drag and capillarity models not included in the commercial version of the software have been implemented. The second tool used is the domestic code Multiphase Flow Solver, written in Fortran programming language, which has been developed during this doctoral thesis, being one important goal of it. This code includes the models needed to describe the physical processes which describe the behavior of this type of multiphase flows and their dispersion in porous media.
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Lebsanft, Markus [Verfasser]. "Untersuchung des Wechselverformungsverhaltens von Werkzeugstählen bei isothermer und thermomechanischer Ermüdung im Temperaturbereich von RT bis 650 °C / Markus Lebsanft." Kassel : Kassel University Press, 2014. http://d-nb.info/1065694989/34.

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Bremer, Jens Verfasser], and Kai [Gutachter] [Sundmacher. "Advanced operating strategies for non-isothermal fixed-bed reactors exemplified for CO 2 methanation / Jens Bremer ; Gutachter: Kai Sundmacher." Magdeburg : Universitätsbibliothek Otto-von-Guericke-Universität, 2020. http://d-nb.info/1232911909/34.

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Parker, Kevin M. "Studies on Inclusion of a Thiol Flavor Constituent and Fatty Acids with beta-Cyclodextrin." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1220041859.

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Books on the topic "BET isotherm"

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Scialpi, Angela, and Alessio Mengoni, eds. La PCR e le sue varianti. Florence: Firenze University Press, 2008. http://dx.doi.org/10.36253/978-88-6453-159-5.

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The book "La PCR e le sue varianti" is designed as a reference tool for those whose laboratory activities deal with methods based on nucleic acid amplification. The text provides the theoretical bases of the polymerase chain reaction (PCR) and its variants (e.g. RT-PCR, quantitative PCR, isothermic PCR) in a rapid and concise manner and describes the principal applications used for genetic identification and the study of genetic polymorphism, in the form of a protocol that can be easily consulted by the users.
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Karayannopoulos, Constantine *. Ispthermal fixed-bed sorption of binary systems: study of solutes with type I, II and IV parent isotherms, using equilibrium theory. Phase separation phenomena. 1988.

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Sherwood, Dennis, and Paul Dalby. The First Law of Thermodynamics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198782957.003.0005.

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The First Law of Thermodynamics, and how the First Law relates a change in a state function, internal energy, to changes in the path functions work and heat. Thermodynamic cycles. Heat capacities at constant volume, and the definition CV = (∂U/∂T)V. Mathematics of internal energy. Examples of the application of the First Law to isothermal, isobaric, isochoric and adiabatic changes. Reversible and irreversible paths. Mixing and friction as irreversible processes. Proof that that any path involving friction (or any other dissipative process) must be irreversible, implying that all real paths are irreversible.
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Escudier, Marcel. Compressible pipe flow. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0013.

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In this chapter gas flow through pipes is analysed, taking account of compressibility and either friction or heat exchange with the fluid. It is shown that in all cases the key parameter is the Mach number. The analyses are based upon the conservation laws for mass, momentum, and energy, together with an equation of state. So that significant results can be achieved, the flowing fluid is treated as a perfect gas, and the flow as one dimensional. Adiabatic pipe flow with wall friction is termed Fanno flow. Frictionless pipe flow with heat transfer is termed Rayleigh flow. It is found that both flows, and also isothermal pipe flow with wall friction, can be limited by choking.
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Deruelle, Nathalie, and Jean-Philippe Uzan. Self-gravitating fluids. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198786399.003.0015.

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This chapter briefly describes ‘perfect fluids’. These are characterized by their mass density ρ‎(t, xⁱ), pressure p(t, ⁱ), and velocity field v(t, ⁱ). The motion and equilibrium configurations of these fluids are determined by the equation of state, for example, p = p(ρ‎) for a barotropic fluid, and by the gravitational potential U(t, ⁱ) created at a point ⁱ by other fluid elements. The chapter shows that, given an equation of state, the equations of the problem to be solved are the continuity equation, the Euler equation, and the Poisson equation. It then considers static models with spherical symmetry, as well as polytropes and the Lane–Emden equation. Finally, the chapter studies the isothermal sphere and Maclaurin spheroids.
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Sherwood, Dennis, and Paul Dalby. Ideal gas processes – and two ideal gas case studies too. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198782957.003.0007.

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This chapter brings together, and builds on, the results from previous chapters to provide a succinct, and comprehensive, summary of all key relationships relating to ideal gases, including the heat and work associated with isothermal, adiabatic, isochoric and isobaric changes, and the properties of an ideal gas’s heat capacities at constant volume and constant pressure. The chapter also has two ‘case studies’ which use the ideal gas equations in broader, and more real, contexts, so showing how the equations can be used to tackle, successfully, more extensive systems. The first ‘case study’ is the Carnot cycle, and so covers all the fundamentals required for the proof of the existence of entropy as a state function; the second ‘case study’ is the ‘thermodynamic pendulum’ – a system in which a piston in an enclosed cylinder oscillates to and fro like a pendulum under gravity, in both the absence, and presence, of friction.
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Shields, Joan E., Martin A. Thomas, Matthias Thommes, and S. Lowell. Characterization of Porous Solids and Powders: Surface Area, Pore Size and Density (Particle Technology Series). Springer, 2006.

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1931-, Lowell S., and Lowell S. 1931-, eds. Characterization of porous solids and powders: Surface area, pore size, and density. 4th ed. Boston: Kluwer Academic Publishers, 2004.

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Characterization of Porous Solids and Powders: Surface Area, Pore Size and Density. Springer, 2012.

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Book chapters on the topic "BET isotherm"

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Lowell, S., and Joan E. Shields. "Langmuir and BET theories (kinetic isotherms)." In Powder Surface Area and Porosity, 14–29. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7955-1_4.

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Zheng, Yufeng, Talukder Alam, Robert E. A. Williams, Soumya Nag, Rajarshi Banerjee, and Hamish L. Fraser. "Structural and Compositional Characteristics of Isothermal Omega Phase in Beta Titanium Alloys." In Proceedings of the 13th World Conference on Titanium, 559–62. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119296126.ch90.

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Cai, Tingting, Dong Zhao, and Zengchao Feng. "Study on coal-bed methane isothermal adsorption at different temperatures based on the monolayer adsorption theory." In Advances in Energy and Environment Research, 176–82. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315212876-36.

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Hudec, Pavol, Agáta Smiešková, and Vladimír Jorík. "Sensitivity of the C-constant of BET-isotherm to the content of micropore volume in mesoporous matrix." In Zeolites and related materials: Trends, targets and challenges, Proceedings of the 4th International FEZA Conference, 981–84. Elsevier, 2008. http://dx.doi.org/10.1016/s0167-2991(08)80054-7.

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Rahman, Md Rezaur, Josephine Lai Chang Hui, and Sinin bin Hamdan. "Impact of nanoclay on physicomechanical, morphological, optical, BET isotherm, and thermal analysis of polyvinyl alcohol/fumed silica/clay nanocomposites." In Silica and Clay Dispersed Polymer Nanocomposites, 33–43. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-08-102129-3.00003-8.

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Taofeek Popoola, Lekan, and Alhaji Shehu Grema. "Adsorption of Heavy Metals from Industrial Wastewater using Nanoparticles from Agro Wastes." In Nanopores [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98241.

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Effluents from essential industries have been characterized with heavy metals which are non-biodegradable in nature and also detrimental to health when accumulated in body tissues over long exposure. Adsorption was proved as the best efficient process amongst others to remove these heavy metals from industrial wastewater due to its excellent features. Activated carbons from nanoparticles of agricultural wastes such as pods, shells, husks, peels, shafts and many prepared via calcination process at high temperature can be used as active adsorbent for the industrial wastewater treatment involving heavy metals removal. This chapter discusses heavy metals in industrial wastewater effluents and potential agro wastes from which nanoparticles of activated carbon for industrial wastewater purification could be generated. The transformation of agro wastes nanoparticles into activated carbons via calcination and their applications for heavy metals removal from industrial wastewater via adsorption were examined. Various characterization techniques to study the effects of calcination on structural, morphological and textural properties of activated carbon prepared from agro waste nanoparticles were also discussed. Various isotherm, kinetics, mechanistic and thermodynamics models to investigate the adsorptive nature of the process were presented. Error functions and algorithms for both the linear and non-linear isotherm models regression to affirm their fitness for prediction were presented. Lastly, proposed adsorption mechanisms of heavy metals removal from industrial wastewater using activated carbons from nanoparticles of agro wastes were presented.
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Yu, Wei, and Kamy Sepehrnoori. "Modeling Gas Adsorption in Marcellus Shale Using Langmuir and BET Isotherms." In Shale Gas and Tight Oil Reservoir Simulation, 129–54. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-813868-7.00004-3.

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Pishkari, Rojiar, and Achim Kienle. "Fast and Accurate Simulation of Simulated Moving Bed Chromatographic Processes with Linear Adsorption Isotherms." In Computer Aided Chemical Engineering, 487–92. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-823377-1.50082-3.

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Lee, Cassian K., and Arvind Varma. "AN ISOTHERMAL FIXED-BED REACTOR WITH NONUNIFORMLY ACTIVE CATALYSTS: EXPERIMENTS AND THEORY." In Tenth International Symposium on Chemical Reaction Engineering, 1995–2000. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-08-036969-3.50042-7.

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Bizon, Katarzyna, and Gaetano Continillo. "POD reduced order dynamical model of non-isothermal Circulating Fluidized Bed Combustor." In Computer Aided Chemical Engineering, 631–36. Elsevier, 2010. http://dx.doi.org/10.1016/s1570-7946(10)28106-3.

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Conference papers on the topic "BET isotherm"

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Saha, Bidyut Baran, Kandadai Srinivasan, Anutosh Chakraborty, Khairul Habib, Ibrahim Ibrahim El-Sharkawy, and Shigeru Koyama. "Adsorption Characteristics of Maxsorb-III + Methane Systems by Desorption Experiments." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42941.

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The adsorption isotherms and kinetics of gaseous methane onto highly porous activated carbon (Maxsorb-III) at temperatures ranging from 278 to 333 K and at different equilibrium pressures between 0.1 and 2.0 MPa have been experimentally measured by the desorption method unlike volumetric or thermo-gravimetric apparatus. The thermophysical properties such as skeletal density, BET surface area, pore size, pore volume and the total porosity of Maxsorb-III have been determined. The Dubinin-Astakhov (DA) and Langmuir isotherm models are found to fit well all of the experimental data within the experimental errors. The experimental isotherms and the computed isosteric heat of adsorption are compared with the measurements of similar specimens of activated carbon of other researchers, and found to be consistent. The present isotherm and isosteric heat data are useful for designing environmentally benign adsorption cooling and storage systems.
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Zammouri, Amel, M. Ben Zid, N. Kechaou, and N. Boudhrioua Mihoubi. "Thermodynamic properties and moisture sorption isotherms of two pharmaceutical compounds." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7702.

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This investigation examines and compares the water sorption isotherms and the thermodynamic properties of two pharmaceutical preparations (Hypril and Azix) intended to be manufactured with the same process plant and equipment. The moisture equilibrium isotherms were determined at 50, 60 and 70 °C using a gravimetric technique. Five isotherm models were explored for their fitting to the experimental data. Azix showed sigmoid type II isotherms while Hypril showed type III isotherms according to the BET classification. All investigated models fitted well the water sorption isotherms of Hypril. By contrast, only GAB and Adam and Shove equations gave appropriate fit to the experimental data of Azix. For both formulations, the isosteric heat and the differential entropy decreased sharply with the increase of equilibrium moisture content to minimum values and thereafter remain constant. In the case of Azix, the integral enthalpy decreased with equilibrium moisture content while the integral entropy increased until reaching a constant value. Contrariwise, Hypril showed decreasing of the integral enthalpy and entropy with the equilibrium moisture content. Keywords: sorption isotherm, enthalpy, entropy, spreading pressure, pharmaceutical formulations
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Koç, Banu, Gamze Atar, and Nazan Çağlar. "Moisture sorption characteristics of pistachio." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7826.

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In this study, the moisture adsorption isotherm of pistachio was determined at 25°C and relative humidity (10-90%), using the standard static, gravimetric method. Eleven sorption models were tested to fit the experimental data. A non-linear regression analysis method was used to evaluate the constants of the sorption equations. The GAB equation gave the best fit to the experimental data for a wide range of water activity, while BET gave the best fit for a water activity range of 0.1-0.5. The agreement between experimental and predicted values of these models was found to be satisfactory. Keywords: Moisture adsorption isotherm; Sorption model; Pistachio
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"Chloride binding isotherms - An approach by applying the modified BET equation." In RILEM International Workshop on Chloride Penetration into Concrete. RILEM Publications SARL, 1997. http://dx.doi.org/10.1617/2912143454.005.

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ZHAO, Xiaodan, Donghui CHEN, and Yurong ZHANG. "A General Isotherm Model for Activated Carbon Adsorption of Typical Natural Organic Matters." In International Conference on Biological Engineering and Pharmacy 2016 (BEP 2016). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/bep-16.2017.58.

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Chakraborty, Anutosh, Syed Muztuza Ali, and How Wei Benjamin Teo. "Study of Waste Heat Driven Adsorption Cooling System Employing Doped MiL-101(Cr) and Water as Adsorbent Adsorbate Pair." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50741.

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This article presents the dynamic behaviors of two bed adsorption chiller utilizing the composite adsorbent “immobilization of NH2, -NO2, -OH groups to MiL-101(Cr)” as adsorbent and water as adsorbate, which is based on the experimentally confirmed adsorption isotherms and kinetics data. The experimentally measured MOFs + water based isotherms and kinetics data are fitted with adsorption isotherm models and linear driving force kinetics equations. Compared with the experimental data of conventional adsorption chiller based on zeolites/silica gel-water system, we found that the newly working pair provides better cooling capacity and performances in terms of COP and adsorption bed size. From numerical simulation, it is also found that the cooling capacity can be increased up to 20 percent of the parent silica gel-water adsorption chiller and the COP can be improved up to 25% more at optimum conditions.
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Jiabi, Deng, Li Ling, and Yuan Decheng. "Determination of adsorption isotherm of column of simulated moving bed." In 2017 36th Chinese Control Conference (CCC). IEEE, 2017. http://dx.doi.org/10.23919/chicc.2017.8027785.

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Medved’, Igor, and Robert Černý. "The time lag in surface diffusion evaluated for the BET and BSB isotherms." In INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING ICCMSE 2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0047728.

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LEE, CHONG HO, YUN JEONG YANG, and YOON MO KOO. "SEPARATION OF AMINO ACID BY SIMULATED MOVING BED USING COMPETITIVE LANGMUIR ISOTHERM." In Proceedings of the 4th International Conference. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702623_0138.

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Luna-Flores, Mario, Mariana Gisela Peña-Juarez, Angélica Mara Bello-Ramirez, Javier Telis-Romero, and Guadalupe Luna-Solano. "Moisture sorption isotherms and isosteric heat sorption of habanero pepper (Capsicum chínense) dehydrated powder." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7637.

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Moisture sorption isotherms of the habanero pepper powder were determined using the Dynamic Vapor Sorption (DVS) method at 20, 25, 35, 45 and 55 °C in a range of water activity from 0.10 to 0.90 at which the processes of drying, packing and storage of habanero pepper are developed. The sorption capacity decreased with increasing temperature at a given water activity and the sorption isotherms showed a sigmoid form (Type II). The hysteresis phenomenon was observed in the sorption isotherms at all temperatures studied and it was more pronounced at temperatures high. The experimental sorption curves were fitting to the GAB, BET and Oswin models. It was concluded that the models that best describe the adsorption and desorption data for habanero pepper dehydrated powder were the GAB and Oswin models. The isosteric heat of water sorption was calculated with the moisture content data in equilibrium. The desorption isotherms present a higher isosteric heat in relation to the adsorption isotherms. In both, the isosteric heat decreased as the moisture content increased. Keywords: Habanero pepper dehydrated powder; Convective drying; Moisture sorption isotherms; Mathematic models
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Reports on the topic "BET isotherm"

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Ley, M., Zane Lloyd, Shinhyu Kang, and Dan Cook. Concrete Pavement Mixtures with High Supplementary Cementitious Materials Content: Volume 3. Illinois Center for Transportation, September 2021. http://dx.doi.org/10.36501/0197-9191/21-032.

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Fly ash is a by-product of coal combustion, made up of particles that are collected through various methods. This by-product has been used successfully as a partial Portland cement replacement in concrete, but the performance predictions of fly ash in concrete have been difficult to predict, especially at high fly ash replacement rates. This study focuses on comparing the performance of concrete with a variety of fly ash mixtures as well as the particle distribution and chemical makeup of fly ash. The slump, unit weight, compressive strength, and isothermal calorimetry tests were used to measure the performance of concrete at 0%, 20%, and 40% fly ash replacement levels. The particle distribution of fly ash was measured with an automated scanning electron microscope. Additionally, the major and minor oxides from the chemical makeup of fly ash were measured for each mixture and inputted into a table. The particle distribution and chemical makeup of fly ash were compared to the performance of slump, unit weight, compressive strength, isothermal calorimetry, and surface electrical resistivity.
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Howard, Isaac, Thomas Allard, Ashley Carey, Matthew Priddy, Alta Knizley, and Jameson Shannon. Development of CORPS-STIF 1.0 with application to ultra-high performance concrete (UHPC). Engineer Research and Development Center (U.S.), April 2021. http://dx.doi.org/10.21079/11681/40440.

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This report introduces the first release of CORPS-STIF (Concrete Observations Repository and Predictive Software – Structural and Thermodynamical Integrated Framework). CORPS-STIF is envisioned to be used as a tool to optimize material constituents and geometries of mass concrete placements specifically for ultra-high performance concretes (UHPCs). An observations repository (OR) containing results of 649 mechanical property tests and 10 thermodynamical tests were recorded to be used as inputs for current and future releases. A thermodynamical integrated framework (TIF) was developed where the heat transfer coefficient was a function of temperature and determined at each time step. A structural integrated framework (SIF) modeled strength development in cylinders that underwent isothermal curing. CORPS-STIF represents a step toward understanding and predicting strength gain of UHPC for full-scale structures and specifically in mass concrete.
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Baral, Aniruddha, Jeffery Roesler, and Junryu Fu. Early-age Properties of High-volume Fly Ash Concrete Mixes for Pavement: Volume 2. Illinois Center for Transportation, September 2021. http://dx.doi.org/10.36501/0197-9191/21-031.

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High-volume fly ash concrete (HVFAC) is more cost-efficient, sustainable, and durable than conventional concrete. This report presents a state-of-the-art review of HVFAC properties and different fly ash characterization methods. The main challenges identified for HVFAC for pavements are its early-age properties such as air entrainment, setting time, and strength gain, which are the focus of this research. Five fly ash sources in Illinois have been repeatedly characterized through x-ray diffraction, x-ray fluorescence, and laser diffraction over time. The fly ash oxide compositions from the same source but different quarterly samples were overall consistent with most variations observed in SO3 and MgO content. The minerals present in various fly ash sources were similar over multiple quarters, with the mineral content varying. The types of carbon present in the fly ash were also characterized through x-ray photoelectron spectroscopy, loss on ignition, and foam index tests. A new computer vision–based digital foam index test was developed to automatically capture and quantify a video of the foam layer for better operator and laboratory reliability. The heat of hydration and setting times of HVFAC mixes for different cement and fly ash sources as well as chemical admixtures were investigated using an isothermal calorimeter. Class C HVFAC mixes had a higher sulfate imbalance than Class F mixes. The addition of chemical admixtures (both PCE- and lignosulfonate-based) delayed the hydration, with the delay higher for the PCE-based admixture. Both micro- and nano-limestone replacement were successful in accelerating the setting times, with nano-limestone being more effective than micro-limestone. A field test section constructed of HVFAC showed the feasibility and importance of using the noncontact ultrasound device to measure the final setting time as well as determine the saw-cutting time. Moreover, field implementation of the maturity method based on wireless thermal sensors demonstrated its viability for early opening strength, and only a few sensors with pavement depth are needed to estimate the field maturity.
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