Relevant bibliographies by topics / Isotherm model

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Academic literature on the topic 'Isotherm model'

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

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Journal articles on the topic "Isotherm model"

1

Rahman, Muttakin, Pal, Shafiullah, and Saha. "A Statistical Approach to Determine Optimal Models for IUPAC-Classified Adsorption Isotherms." Energies 12, no. 23 (November 29, 2019): 4565. http://dx.doi.org/10.3390/en12234565.

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Adsorption heat transformation (AHT) systems can play a major role in protecting our environment by decreasing the usage of fossil fuels and utilizing natural and alternative working fluids. The adsorption isotherm is the most important feature in characterizing an AHT system. There are eight types of International Union of Pure and Applied Chemistry (IUPAC) classified adsorption isotherms for different “adsorbent-adsorbate” pairs with numerous empirical or semi-empirical mathematical models to fit them. Researchers face difficulties in choosing the best isotherm model to describe their experimental findings as there are several models for a single type of adsorption isotherm. This study presents the optimal models for all eight types of isotherms employing several useful statistical approaches such as average error; confidence interval (CI), information criterion (ICs), and proportion tests using bootstrap sampling. Isotherm data of 13 working pairs (which include all eight types of IUPAC isotherms) for AHT applications are extracted from literature and fitted with appropriate models using two error functions. It was found that modified Brunauer–Emmet–Teller (BET) for Type-I(a) and Type-II; Tóth for Type-I(b); GAB for Type-III; Ng et al. model for Type-IV(a) and Type-IV(b); Sun and Chakraborty model for Type-V; and Yahia et al. model for Type-VI are the most appropriate as they ensure less information loss compared to other models. Moreover; the findings are affirmed using selection probability; overall; and pairwise proportion tests. The present findings are important in the rigorous analysis of isotherm data.
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Chen, Chiachung. "Validation of the Component Model for Prediction of Moisture Sorption Isotherms of Two Herbs and other Products." Foods 8, no. 6 (June 1, 2019): 191. http://dx.doi.org/10.3390/foods8060191.

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Sorption isotherm is an essential property for the processing of biological materials. In this study, a component model for the prediction of the sorption isotherm was evaluated. In order to validate this component model, the moisture sorption isotherms for Chrysanthemum morifolium flowers and the orchid Anoectochilus formosanus Hayata were determined. The sorption isotherm was measured by using the equilibrium relative humidity technique for five temperatures. Seven sorption isotherm models were selected with four quantitative criteria and residual plots to evaluate fitting ability and prediction performance for these products. The results indicated that the sorption temperature did not significantly affect the adsorption isotherm. The Caurie and Henderson equations could be used for C. morifolium flowers and A. formosanus Hayata. The isotherm data of raw bamboo, elecampe and three varieties of corn kernels from the literature were adopted to validate the component model. Comparing with the predicted values of component values and actual isotherm moisture, the component model has good predictive ability at the aw range smaller than 0.7. Considering the practical application, the aw range below 0.7 is the main range for the processing of agricultural products, and the predictive values of this component model could be helpful for food engineering and for the food industry.
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Brdar, Mirjana, Aleksandar Takaci, Marina Sciban, and Dusan Rakic. "Isotherms for the adsorption of Cu(II) onto lignin: Comparison of linear and non-linear methods." Chemical Industry 66, no. 4 (2012): 497–503. http://dx.doi.org/10.2298/hemind111114003b.

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Equilibrium studies were carried out for the adsorption of Cu(II) onto Kraft lignin as an adsorbent. The experimental data were fitted to the Freundlich, Langmuir and Redlich-Peterson isotherms by linear and non-linear method. Comparison of linear and non-linear regression method was given in selecting the optimum isotherm for the experimental data. The coefficient of correlation r2 and Chi-square test ?2 was used to select the best linear theoretical isotherm. The best linear model is Redlich-Peterson isotherm model, where r2=0,985 and ?2=0,02. In order to predict the error ERRSQ, HYBRD, MPSD, ARE and EABS were used. Moreover, by minimizing these error functions the optimal values of parameters and also the optimum isotherm was found. The Redlich-Peterson isotherm was found to be the best representative for adsorption of Cu(II) on the adsorbent in the cases when ERRSQ, HYBRD, MPSD functions were used. There coefficients of determination are 0.986, 0.985, 0.984, respectively and Chi-square is 0.02 in all cases. Freundlich isotherms which were obtained by minimization of the ERRSQ, HYBRD, MPSD, ARE and EABS function showed very good agreement with experimental data. In all cases the coefficients of determination are greater than 0.91. Besides, it was observed that non-linear isotherm models were better for representation of equilibrium data than linearized models.
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Costa, Joyce Maria Gomes da, Jefferson Luiz Gomes Corrêa, Bruno Elyeser Fonseca, Flávio Meira Borém, and Soraia Vilela Borges. "DRYING AND ISOTHERMS OF SUGAR CANE BAGASSE - DOI: 10.13083/1414-3984/reveng.v23n2p128-142." REVISTA ENGENHARIA NA AGRICULTURA - REVENG 23, no. 2 (April 30, 2015): 128–42. http://dx.doi.org/10.13083/reveng.v23i2.504.

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Sugarcane is nowadays considered an important source of energy. One of its products is sugarcane bagasse. Bagasse is largely used as a boiler fuel. The goal of this work was to study bagasse drying in a fixed bed and its desorption isotherm. Air was used as drying agent at 40, 50 and 60 ºC at flow rate of 0.9 m s-1. Desorption isotherms were also obtained at 40 and 50 ºC. Several models from literature were tested with regards to their fit to fixed bed drying and desorption isotherm data. The best adjustments were obtained with Modified Page 2 model for drying kinetics and both the Jaafar and Michalowski model and modified Henderson 2 model for the desorption isotherm.
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Liu, Junsheng, and Xin Wang. "Novel Silica-Based Hybrid Adsorbents: Lead(II) Adsorption Isotherms." Scientific World Journal 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/897159.

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Water pollution caused by the lead(II) from the spent liquor has caught much attention. The research from the theoretical model to application fundaments is of vital importance. In this study, lead(II) adsorption isotherms are investigated using a series of hybrid membranes containing mercapto groups (–SH groups) as the hybrid adsorbents. To determine the best fitting equation, the experimental data were analyzed using six two-parameter isotherm equations (i.e., Langmuir, Freundlich, Dubinin-Radushkevich (D-R), Temkin, Harkins-Jura, and Halsey isotherm models). It was found that the lead(II) adsorption on these samples followed the Freundlich, Dubinin-Radushkevich (D-R), and Halsey isotherm models. Moreover, the mean free energy of adsorption was calculated using Dubinin-Radushkevich (D-R) isotherm model and it was confirmed that the adsorption process was physical in nature. These findings are very meaningful in the removal of lead(II) ions from water using the hybrid membranes as adsorbents.
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Hussain, Zainab, Zeyad Fadhil, Sameer Kareem, Salam Mohammed, and Emad Yousif. "Removal of Organic Contaminants from Textile Wastewater by Adsorption on Natural Biosorbent." Materials Science Forum 1002 (July 2020): 489–97. http://dx.doi.org/10.4028/www.scientific.net/msf.1002.489.

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In the present study, removal of safranin dye from water bodies was investigated using natural biosorbent (Thyme leaves (TEL)). The influence of multiple factors such as as contact time (15 – 105 mins), adsorbent dose (25 to 350) mg/l , adsorbate dose (5 to 40)mg\L, and temperature (25 to 55)o C were taken for investigation. The adsorption isotherms were described by utilized Langmuir, Freundlich and Dubnin-Radushkevich models, Freundlich isotherm model found to be best suited with experimental data out of 3 isotherm The adsorption process followed pseudo second order model.
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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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Luthra, Kaushik, Soraya Shafiekhani, Sammy S. Sadaka, and Griffiths G. Atungulu. "Determination of Moisture Sorption Isotherms of Rice and Husk Flour Composites." Applied Engineering in Agriculture 36, no. 6 (2020): 859–67. http://dx.doi.org/10.13031/aea.13822.

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HighlightsMoisture sorption isotherms of rice and husk flour composites were determined.Adsorption isotherms were best modeled by the Chung-Pfost and Oswin equations.Desorption isotherms were best modeled by the Polynomial and Chung-Pfost equations.The Modified Oswin model was the best for both adsorption and desorption.Abstract. Empirical models describing isotherms specifically for adsorption and desorption have not been described for rough rice and husk flour composites. Such models are vital for process control and monitoring operations which use rice husk and rice flours or their mixtures for food or material processing. The current study was undertaken to determine the moisture sorption isotherms of rice husk flour, rough rice flour and their mixtures subjected to different temperature levels. Effects of rice husk flour to rough rice flour ratio of 0:1 (0.0%), 1:49 (2.0%), 1:16 (5.9%), and 1:0 g/g (100.0%) on rough rice moisture isotherms at temperature levels of 20°C, 40°C, and 60°C were investigated. The dynamic dewpoint isotherm technique (DDI) was used to generate accurate isotherms. Several empirical models were tested to fit the experimental EMC data. All the isotherms showed typical sigmoidal type 2 shapes. The equilibrium moisture content (EMC) over equilibrium relative humidity (water activity) ranging from 10% to 95% showed temperature dependence. Hysteresis was evident for all samples, with a decreasing level at a higher temperature. Rice husk flour to rough rice flour ratio, as a factor, showed a significant effect on the EMC of rough rice. The EMC decreased with an increase in rice husk flour levels. Chung-Pfost and Oswin were the two best models for describing adsorption isotherm, and Polynomial and Chung-Pfost were the best models for fitting the desorption isotherm. Modified Oswin model was the best model amongst the two-variable models for describing both adsorption and desorption isotherms. Keywords: Empirical models, Equilibrium moisture content, Rice husk flour, Rough rice flour, Sorption isotherms.
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Owabor, C. N., I. O. Oboh, and F. A. Omiojieahior. "Adsorption Isotherms for Naphthalene on Clay and Silt Soil Fractions: A Comparison of Linear and Nonlinear Methods." Advanced Materials Research 367 (October 2011): 359–64. http://dx.doi.org/10.4028/www.scientific.net/amr.367.359.

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Polycyclic aromatic hydrocarbons occur naturally in petroleum oil and coal and the burning of fuel and the activities of paper mills also release these compounds to the environment. Batch experimental adsorption study for both soil fractions was conducted in a soil slurry system at ambient temperature, using <0.02mm particle sizes. Comparison was made of the linear least-squares method and a trial-and-error nonlinear method of some widely used isotherm models for the adsorption of naphthalene on clay and silt fractions. The experimental results were fitted to the Langmuir, Freundlich, Radke-Prausnitz, Sips, Temkin and Redlich-Peterson isotherms to obtain their characteristic parameters of each model. The coefficient of determination obtained from the different models using the linear method showed that Freundlich isotherm had the highest values for both clay and silt soil fractions with values of 0.843 and 0.897 respectively. The equilibrium data did not fit the Langmuir isotherm with values of 0.287 and 0.021 for clay and silt soil respectively. Using the nonlinear method the equilibrium data gave good fit for Radke-Prausnitz, Sips, Temkin and Redlich-Peterson isotherms. Sips isotherm gave the best fit for silt soil with the r2value of 0.9779 and this was followed by Temkin isotherm for clay soil with the value of 0.9673.
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He, Shao Hua, Dan Wang, Qing Qiu Kong, and Xi Wu. "Thermodynamic Studies for Adsorption of Cd2+ and Pb2+ from Waster Water on Modified Walnut Shell." Applied Mechanics and Materials 737 (March 2015): 622–26. http://dx.doi.org/10.4028/www.scientific.net/amm.737.622.

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The adsorption isothermal curve and thermodynamic adsorption of Cd2+ and Pb2+ on modified walnut shell from waster water were investigated using batch technique. The equilibrium adsorption data are fitted to Langmuir and Freundlich isotherm models and the model parameters are evaluated. The Langmuir isotherm model shows a better fit to adsorption data than the Freundlich isotherm model for the sorption of Cd2+ and Pb2+ on modified walnut shell. The maximum adsorption capacity of Cd2+ and Pb2+ by modified walnut shell is found to be 32.68 mg·g-1 and 84.75 mg·g-1 at 298K temperature, respectively. The adsorption processes of Cd2+ and Pb2+ has feasibility and spontaneous nature. Thermodynamic parameters depict the endothermic nature of sorption and the process is spontaneous and favorable.
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Dissertations / Theses on the topic "Isotherm model"

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Ho, Loi. "Determination of Ibuprofen Isotherm Using Supercritical Fluid Chromatography." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4075.

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Chromatography is widely used to determine physiochemical properties data including adsorption isotherm. In the separation of enantiomers through sorptive processes, supercritical fluids allow efficient and green alternatives to liquid solvent based systems. The isotherm information is vital in the development of operating policies and design of preparative chromatographic or moving bed separation schemes. Determination of sorption isotherms from experimental chromatographic elution data is automated and compared with different chromatogram model. Procedures were developed and validated for separation of R- and S- ibuprofen with supercritical 〖CO〗_2 and ethanol mixture as the mobile phase over a chiral stationary phase. The isotherms for the Langmuir, Freundlich, and Toth gave the similar results with a small residual for S-Ibuprofen at 150 bars and 40℃. Relative small amount of sample can be use from experiments to determine isotherms data that later be use for scale-up of the sorptive processes in industry to reduce time and cost.
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Yu, Lin. "Modeling the Longevity of Infiltration System for Phosphorus Removal." Thesis, KTH, Miljögeokemi och ekoteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96097.

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A new modeling method for estimation of the longevity of infiltration system was suggested in this study. The model was one-dimensional, based on results from long-term infiltration sites in Sweden, taking some physical and chemical parameters as controlling factors. It defines the longevity of infiltration systems as the time during which the P solution in effulent is under national criteria (1 mg/L in this study), and it aims at providing the longevity for any given point of the infiltration system. The soil in the model was assumed to be totally homogenous and isotropic and water flow was assumed to be unsaturated flow and constant continuous inflow. The flow rate was calculated from the Swedish criteria for infiltration systems. The dominant process in the model would be the solute transport process; however, retardation controlled by sorption would play a more important role than advection and dispersion in determining the longevity in the model. By using the definition of longevity in this study, the longevity of the three soil columns at 1 m depth (Knivingaryd, Ringamåla and Luvehult) were 1703 days, 1674 days and 2575 days. The exhaustion time of the three soil columns under inflow of 5 mg/L were 2531 days, 2709 days and 3673 days. The calculated sorbed phosphorus quantity for soil from sites Kn, Lu and Ri when they reach estimated longevity were 0.177, 0.288 and 0.168 mg/g, while the maximum sorption of Kn, Lu and Ri were 0.182, 0.293 and 0.176 mg/g separately. From the result of sensitivity study of the model, the sorption capacity and flow velocity were most important to the longevity of the infiltration system. Lower flow velocity and higher P sorption capacity extend the longevity of an infiltration bed. Due to the sorption isotherm selected in this study and the assumption of instant equilibrium, the sorption rate of the soil column was quite linear, although the estimated longevity was much shorter than the real exhaustion time of the soil column. In fact the soil has almost reached its sorption maximum when the system reaches its longevity.
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Sbizzaro, Mariana. "Adsorção de atrazina em biocarvões obtidos a partir de colmo de bambu." Universidade Estadual do Oeste do Parana, 2016. http://tede.unioeste.br:8080/tede/handle/tede/272.

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Made available in DSpace on 2017-05-12T14:47:40Z (GMT). No. of bitstreams: 1 Mariana_ sbizzaro.pdf: 1501907 bytes, checksum: 5610159e30f98d52848320f90146f751 (MD5) Previous issue date: 2016-02-12
The agricultural sector has great influence in Brazilian economy. Furthermore, agricultural yield has been associated with pesticides application during crop cycle, which atrazine is applied for example, since it can cause environmental contamination when it does not reach its target. Thus, there are some essential and imperative options that can minimize contamination and negative impacts during agricultural practices. So, present study aimed at evaluating the ability of three biochars in atrazine adsorption. Therefore, three biochars produced from bamboo culm were used, whose species is Phyllostachys aurea, and temperature ranged at 350 ºC, 450 ºC and 550 ºC. The three studied biochars were named as BE350, BE450 and BE550. They were characterized based on their physical and chemical properties by elemental analysis, characterization of functional groups (Infrared Spectroscopy Fourier Transform - FTIR), surfaces morphology evaluation (Scanning Electron Microscopy - SEM) as well as specific surface area (ASEBET) and porosity. A kinetic study was carried out to determine the equilibrium period of adsorption process and the kinetic mechanism that controls such process. Langmuir and Freundlich isotherms were also modeled during this trial. Atrazine determination, after the adsorption test, was carried out by High Performance Liquid Chromatography (HPLC). The obtained analyses showed that the adsorption capacity of biochars decreased in the following order: BE 450> BE 350 > BE 550, and such capacity has been associated with the physical and chemical characteristics of biochars. The three studied biochars are well represented by the kinetic model of pseudo-second order. At last, all biochars have shown high affinity to adsorb atrazine; however, the biochar that was produced at 450 ºC has shown the highest adsorption capacity.
O setor agrícola possui grande destaque na economia brasileira, a produção agrícola está associada ao uso de pesticidas durante o ciclo das culturas, como é o caso da atrazina, que pode causar a contaminação do ambiente, quando não atinge seu alvo. Sendo assim, alternativas que minimizem as contaminações e impactos negativos da prática agrícola são essenciais e urgentes. Desta forma, o presente estudo teve por objetivo avaliar a capacidade de três biocarvões, em adsorver o herbicida atrazina. Para tanto, foram utilizados três biocarvões, produzidos a partir do colmo de bambu, da espécie Phyllostachys aurea à 350ºC, 450ºC e 550ºC, nomeados BE350, BE450 e BE550. Os biocarvões foram caracterizados quanto as propriedades físicas e químicas, por meio de análise elementar, caracterização de grupos funcionais (Espectroscopia de Infravermelho com Transformada de Fourier - FTIR), avaliação da morfologia das superfícies (Microscopia Eletrônica de Varredura - MEV), bem como, área superficial específica (ASEBET) e porosidade. Estudo cinético foi realizado, visando determinar o tempo de equilíbrio do processo de adsorção, bem como, o mecanismo cinético que controla o processo. Também foram modeladas isotermas de Langmuir e Freundlich. A determinação da atrazina, após os ensaios de adsorção, foi realizada por Cromatografia Líquida de Alta Performance (CLAE). As análises realizadas apontaram que a capacidade de adsorção dos biocarvões diminuiu na ordem de BE 450 > BE 350 > BE 550, e tal capacidade está associada às características físicas e químicas dos biocarvões. Os três biocarvões são bem representados pelo modelo cinético de pseudo-segunda ordem. Todos biocarvões exibiram elevada afinidade para a adsorção do herbicida atrazina, contudo, o biocarvão produzido à 450 ºC demonstra maior capacidade de adsorção
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Liu, Jia. "Development of a Design-Based Computational Model of Bioretention Systems." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/52703.

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Multiple problems caused by urban runoff have emerged as a consequence to the continuing development of urban areas in recent decades. The increase of impervious land areas can significantly alter watershed hydrology and water quality. Typical impacts to downstream hydrologic regimes include higher peak flows and runoff volumes, shorter concentration times, and reduced infiltration. Urban runoff increases the transport of pollutants and nutrients and thus degrades water bodies adjacent to urban areas. One of the most frequently used practices to restore the hydrology and water quality of urban watersheds is bioretention (also known as a rain garden). Despite its wide applicability, an understanding of its multiple physiochemical and biological treatment processes remains an active research area. To provide a wide ability to evaluate the hydrologic input to bioretention systems, spatial and temporal distribution of storm events in Virginia were studied. Results generated from long-term frequency analysis of 60-year precipitation data demonstrate that the 90 percentile, or 10-year return period rainfall depth and dry duration in Virginia are between 22.9 – 35.6 mm and 15.3 – 25.8 days, respectively. Monte-Carlo simulations demonstrated that sampling programs applied in different regions would likely encounter more than 30% of precipitation events less than 2.54 mm, and 10% over 25.4 mm. Further experimental research was conducted to evaluate bioretention recipes for retaining stormwater nitrogen (N) and phosphorus (P). A mesocosm experiment was performed to simulate bioretention facilities with 3 different bioretention blends as media layers with underdrain pipes for leachate collection. A control group with 3 duplicates for each media was compared with a replicated vegetated group. Field measurement of dissolved oxygen (DO), oxidation-reduction potential (ORP), pH, and total dissolved solids (TDS) was combined with laboratory analyses of total suspended solids (TSS), nitrate (NO3), ammonium (NH4), phosphate (PO4), total Kjeldahl nitrogen (TKN) and total phosphorus (TP) to evaluate the nutrient removal efficacies of these blends. Physicochemical measurements for property parameters were performed to determine characteristics of blends. Isotherm experiments to examine P adsorption were also conducted to provide supplementary data for evaluation of bioretention media blends. The results show that the blend with water treatment residuals (WTR) removed >90% P from influent, and its effluent had the least TDS / TSS. Another blend with mulch-free compost retained the most (50 – 75%) total nitrogen (TN), and had the smallest DO / ORP values, which appears to promote denitrification under anaerobic conditions. Increase of hydraulic retention time (HRT) to 6 h could influence DO, ORP, TKN, and TN positively. Plant health should also be considered as part of a compromise mix that sustains vegetation. Two-way analysis of variance (ANOVA) found that single and interaction effects of HRT and plants existed, and could affect water quality parameters of mesocosm leachate. Based upon the understanding of the physiochemical and hydrologic conditions mentioned previously, a design model of a bioretention system became the next logical step. The computational model was developed within the Matlab® programming environment to describe the hydraulic performance and nutrient removal of a bioretention system. The model comprises a main function and multiple subroutines for hydraulics and treatment computations. Evapotranspiration (ET), inflow, infiltration, and outflow were calculated for hydrologic quantitation. Biomass accumulation, nitrogen cycle and phosphorus fate within bioretention systems were also computed on basis of the hydrologic outputs. The model was calibrated with the observed flow and water quality data from a field-scale bioretention in Blacksburg, VA. The calibrated model is capable of providing quantitative estimates on flow pattern and nutrient removal that agree with the observed data. Sensitivity analyses determined the major factors affecting discharge were: watershed width and roughness for inflow; pipe head and diameter for outflow. Nutrient concentrations in inflow are very influential to outflow quality. A long-term simulation demonstrates that the model can be used to estimate bioretention performance and evaluate its impact on the surrounding environment. This research advances the current understanding of bioretention systems in a systematic way, from hydrologic behavior, monitoring, design criteria, physiochemical performance, and computational modeling. The computational model, combined with the results from precipitation frequency analysis and evaluation of bioretention blends, can be used to improve the operation, maintenance, and design of bioretention facilities in practical applications.
Ph. D.
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Telesford, Dana-Marie Leslie-Ann. "Langmuir Trough and Brewster Angle Microscopy Study of Model Lung Surfactant Monolayers at the Air/Aqueous Interface." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1353516892.

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Delgado, Cano Beatriz. "Caractérisation des matériaux commerciaux et synthétisés destinés à adsorber le méthane et l’oxyde nitreux présents dans des émissions gazeuses et modélisation de l’adsorption." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1073.

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Les activités humaines ont généré une augmentation importante de la concentration de gaz à effet de serre (GES) au cours des 150 dernières années, ce qui est relié à plusieurs problèmes environnementaux, tels que le réchauffement planétaire et les changements climatiques. Le secteur agricole contribue de 8 à 10% aux émissions totales de GES dans l'atmosphère, et les principaux GES émis sont le dioxyde de carbone (CO2), le méthane (CH4) et l'oxyde nitreux (N2O). Le contrôle et la quantification de ces émissions requièrent des technologies qui permettent de les capturer et ou les dégrader, par exemple par adsorption. L'objectif du présent projet est de caractériser des matériaux qui puissent être utilisés comme adsorbants des GES et de décrire leurs cinétiques d'adsorption afin d'avoir l'information qui permet de sélectionner des adsorbants pour capturer le CH4 et le N2O à des basses concentrations et à température et pression ambiantes. Pour adsorber le CH4, des adsorbants commerciaux et synthétiques ont été utilisés. Les adsorbants choisis ont été des zéolithes, un biocharbon conditionné au laboratoire et un ZIF (« Zeolitic imidazolate framework », ZIF-8) synthétisé au laboratoire. Ce dernier a été employé aussi pour adsorber du N2O. La capacité d'adsorption de CH4 et de N2O a été évaluée pour chaque adsorbant par de tests dynamiques d'adsorption du gaz sous conditions ambiantes. Ces matériaux ont été caractérisés physiquement et chimiquement afin de corréler leurs propriétés avec la capacité d'adsorption de CH4 et/ou de N2O. Des isothermes d'équilibre ont été utilises pour modéliser les donnés expérimentales. Parmi les différents matériaux utilisés lors de l'adsorption du CH4 à 30 ºC et à pressions partielles de CH4 inférieures à 0,40 kPa, les biocharbons présentent la capacité d'adsorption la plus élevée, suivis par le ZIF-8 et les zéolithes commerciales
Human activities contributed with a significant increase in GHG concentrations over the past 150 years and they are related to environmental issues, such as global warming and climate change. The agricultural sector contributes 8 to 10% of total GHG emissions to the atmosphere, being carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) the main GHGs emitted. The control and quantification of these emissions requires technologies which can capture and or degrade these GHG, for example by adsorption. The objective of this project is to characterize adsorbents and to describe their adsorption kinetics in order to select the most suitable for the adsorption of CH4 and N2O at low concentration and at ambient temperature. For CH4 adsorption, commercial and synthesized adsorbents were tested. The selected adsorbents were commercial zeolites, laboratory conditioned biochar and synthesized ZIF ("Zeolitic imidazolate framework"). ZIF was also used for N2O adsorption. The adsorption capacity of CH4 and N2O for each adsorbent was evaluated by dynamic adsorption tests of the gas under atmospheric conditions. These materials were physically and chemically characterized in order to correlate its properties with its CH4 and/or N2O adsorption capacity. The experimental data of gas adsorption were fitted by equilibrium isotherms. Among the different materials used for CH4 adsorption at 30 ºC and partial pressures lower than 0.40 kPa, biocharbons presented the highest adsorption capacity, followed by ZIF- 8 and commercial zeolites
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7

Castada, Hardy Zingalaoa. "Brewster Angle Microscopy Study of Model Lung Surfactant Systems at the Air-Water and Air-Physiological Buffer Interfaces." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281642097.

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Ferreira, Mário Nogueira. "Estudo da secagem de jabuticaba (polpa e casca) pelo método de camada de espuma." Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/7962.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
The objective of this work was to characterize the pulp + jabuticaba shell, the foams of the formulations (F1, F2, F3, F4) and the pulp + jabuticaba shell powder by the foam layer method. It was used jabuticaba of the variety M. cauliflora sp (jabuticaba sabará), harvest 2016. The pulp + jabuticaba bark were characterized as centesimal composition, hydrogenation potential, total titratable acidity, total soluble solids, energy value, water activity and color (a*, b *, L *, h * and C *). The foam was characterized regarding density, the percentage of expansion, stability, and fraction of drained volume, drying curves and mathematical modeling. The pulp + bark of jabuticaba powder was also characterized for the adsorption isotherm, scanning electron microscopy (SEM), antioxidant potential by the DPPH method, ABTS and FRAP, total phenolics, condensed and hydrolyzed tannins, absorption indexes and solubility in water (AI/SW) and milk (IAL / ISL) and oil absorption index (OAI). It was observed that the moisture content, SST, pH, acidity, water activity and color did not change, while all other analyzes were influenced. Formulation F3 was the one that best fit the foam evaluation criteria. The model of Wang and Singh presented the lowest reduced chi-square (χ²) and the highest coefficients of determination (R²), whereas the Page model obtained higher values for the drying rate and lower values for the internal resistance to the formulation F3. It was verified that the formulation F3 presented greater reduction of the moisture ratio as a function of time compared to the other formulations during processing. Therefore, a model can be adjusted in certain bands and not in others, which limits the application of empirical models. The results obtained in this study demonstrate that the pulp foam drying + jabuticaba bark can make a promising alternative in the post harvest of this important fruit since it allows the retention of nutritional components of interest in this product and thus increases the consumption Of this product in powder form.
Objetivou-se com este trabalho caracterizar a polpa+casca de jabuticaba, as espumas das formulações (F1, F2, F3, F4) e da polpa+casca de jabuticaba em pó pelo método de camada em espuma. Utilizou-se jabuticaba da variedade M. cauliflora sp (jabuticaba sabará), safra 2016. A polpa+casca de jabuticaba foram caracterizadas quanto à composição centesimal, pH, acidez total titulável, sólidos solúveis totais, valor energético, atividade de água e cor (a*, b*, L*, h* e C*). A espuma foi caracterizada quanto à densidade, percentual de expansão, estabilidade e fração do volume drenado, curvas de secagem e modelagem matemática. A polpa+casca de jabuticaba em pó foi caracterizada também quanto à isoterma de adsorção, microscopia eletrônica de varredura (MEV), capacidade antioxidante pelo método de DPPH, ABTS e FRAP, fenólicos totais, taninos condensados e hidrolisáveis, índices de absorção e solubilidade em água (IAA/ISA) e em leite (IAL/ISL) e índice de absorção em óleo (IAO). Observou-se que os teores de umidade, SST, pH, acidez, atividade de água e cor não sofreram alterações, enquanto que todas as demais análises foram influenciadas. A formulação F3 foi a que se enquadrou melhor nos critérios de avaliação das espumas. O Wang e Singh foi o que apresentou os menores qui-quadrado reduzido (χ²) e os maiores coeficientes de determinação (R²), já o modelo de Page obteve maiores valores para a taxa de secagem e menores valores para a resistência interna para a formulação F3. Verificou-se que a formulação F3 apresentou maior redução da razão de umidade em função do tempo comparado com as demais formulações durante o processamento. Portanto, um modelo pode-se ajustar em determinadas faixas e não em outras, o que limita a aplicação de modelos empíricos. Os resultados obtidos neste estudo demonstram que a secagem em camada de espuma de polpa+casca de jabuticaba pode tornar uma alternativa promissora na pós-colheita dessa importante fruta, uma vez que, possibilita a retenção de componentes nutricionais de interesse neste produto e assim aumenta o consumo deste produto na forma de pó.
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9

Gabos, Mariana Bassetto. "Background concentrations and adsorption of selenium in tropical soils." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-20092012-164703/.

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Selenium (Se) is a trace element essential to the nutrition of animals. On the other hand, in a narrow concentration range, Se can cause toxicity. The presence of Se in food is related to the concentration of the element in soil. Thus, the knowledge of the Se amount and its behavior in soil are very important to the better manage the environment and to prevent toxicological problems and human deficiency. The objectives of this study were: (i) to quantify the natural content of Se in some Brazilian soils and correlates them with soil attributes; (ii) to evaluate the adsorption of selenite and selenate as a function of pH and Se concentration in tropical soils; (iii) to adjust the constant capacitance model to describe the Se adsorption in tropical soil as compared to empiric models. Se concentrations ranged from <0.08 to 1.61 mg kg-1, with a mean of 0.19 mg kg-1. Concentrations of Se in the samples collected in the superficial layers were positively correlated to cationic exchange capacity, as well as to clay, organic matter and oxide contents of the soils. In the subsurface samples, only pH and aluminum oxide content were correlated with Se concentrations. Most samples with the highest Se concentrations were derived from sedimentary parent material. Se(IV) adsorption was high for all soils, decreased with increasing pH and was strongly correlated to organic matter and Fe and Al oxides contents. On the other hand, Se(VI) adsorption was very low at pH values commonly found in agricultural soils, except for the highly weathered Rhodic Acrudox which was positively correlated with the gibbsite content. The constant capacitance model fit the Se(IV) and Se(VI) adsorption data well, and was similar to Langmuir and Freundlich empirical models. Optimizations of mono and bidentate complexation and surface protonation constant were used for the Se(IV) adsorption data. For Se(VI), optimizations for the two monodentate species were employed.
O selênio (Se) é um elemento traço essencial a nutrição animal. Por outro lado, o limiar de concentração entre suficiente e tóxico é estreito. A presença de Se nos alimentos está relacionada à sua concentração no solo. Deste modo, conhecer a quantidade e o comportamento do Se no solo é muito importante para um correto manejo ambiental, previnindo problemas toxicológicos e deficiência em humanos. Os objetivos deste estudo foram: (i) quantificar os conteúdos naturais de Se em solos brasileiros e correlacioná-los com seus atributos; (ii) avaliar a adsorção de selenito e selenato em função da variação do pH e da concentração de Se em solos tropicais; (iii) ajustar o modelo de capacitancia constante para descrever a adsorção de Se em solos tropicais comparado a modelos empíricos. As concentrações de Se variaram de <0,08 - 1,61 mg kg-1, com média de 0,19 mg kg-1. As concentrações de Se nas amostras coletadas nas camadas superficiais do solo foram positivamente correlacionadas com a capacidade de troca catiônica, bem como os teores de argila, matéria orgânica e óxidos de Fe e Al do solos. Nas amostras subsuperficiais, apenas pH e teor de óxido de alumínio foram correlacionadas com as concentrações de Se. A maioria das amostras com maiores concentrações de selênio foram provenientes de material de origem sedimentar. A adsorção de Se(IV) foi elevada para todos os solos, diminuiu com o aumento do pH e foi fortemente correlacionada com teores de matéria orgânica e de óxidos de Fe e de Al. Por outro lado, a adsorção de Se(VI) foi muito baixa em valores de pH normalmente encontrados em solos agrícolas, excepto para o Latossolo Vermelho acriférrico, que foi positivamente correlacionada com o teor de gibbsita dos solos. O modelo de capacitância constante ajustou-se bem aos resultados de adsorção Se(IV) e Se(VI), com ajuste similar aos modelos empíricos de Langmuir e de Freundlich. Para os resultados de adsorção de Se(IV) foram utilizadas otimizações das constantes de complexação mono e bidentadas e da constante de protonação de superfície. Para Se(VI), foram empregadas otimizações para as duas espécies de monodentadas.
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10

Garcia, Edder. "CO2 adsorption from synthesis gas mixtures : understanding selectivity and capacity of new adsorbents." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10195.

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Le développement de nouveaux adsorbants écologiques et efficaces pour la séparation du CO2 nécessite un lien quantitatif entre les propriétés des adsorbants et ses propriétés d'adsorption. Dans ce travail, nous développons une méthodologie qui prend en compte explicitement les propriétés des adsorbants, tels que le diamètre de pore, la densité, la forme de pore et la composition chimique. L'objectif est d'établir des corrélations quantitatives entre les paramètres mentionnés ci-dessus et les forces qui gouvernent la physisorption dans les milieux poreux, c'est à dire les interactions van der Waals et les interactions électrostatiques. Ainsi, les propriétés optimales des adsorbants pour la séparation du CO2 sont identifiées. En parallèle à ces études théoriques, une série d'adsorbants potentiellement intéressants pour la séparation du CO2 par PSA ont été testées expérimentalement. Une étude systématique de l'influence du centre métallique sur les séparations de mélanges CO2/CH4 et CO2/CH4/CO a été réalisée sur MOFs présentant sites coordinativement insaturés. Dans le cas des zéolithes, l'effet de la composition chimie (rapport Si / Al) sur les propriétés de séparation a été étudiés. Les capacités cycliques et des sélectivités ont été déterminées par des expériences de perçage. Les matériaux présentant un bon compromis entre la sélectivité et la capacité de travailler dans les conditions typiques de PSA ont été identifiés. Finalement, une comparaison entre la prédiction du modèle d'adsorption et les expériences a été faite
The design of new environmentally friendly and efficient adsorbents for CO2 separation requires a quantitative link between the adsorbent properties and adsorption capabilities. In this work we develop a methodology, which explicitly takes into account the adsorbent properties, such as the pore diameter, density, pore shape and chemical composition. The objective is to establish quantitative correlations between the above-mentioned parameters and the forces that govern physisorption in porous media, i.e. van der Waals forces and electrostatic interactions. Thus, the optimal properties of the adsorbent for CO2 separation are identified. In parallel to these theoretical studies, a series of potentially interesting adsorbents for CO2 separation by PSA were tested experimentally. A systematic study of the influence of the metal center on the separations of CO2/CH4 and CO2/CH4/CO mixtures was carried out on MOFs presenting coordinatively unsaturated sites. In the case of zeolites, the effect of the framework composition (Si/Al ratio) on the separation properties was studied. The cyclic capacities and selectivities were determined by breakthrough experiments. Materials presenting a good compromise between selectivity and working capacity under typical PSA conditions were identified. Finally, a comparison between the prediction of the adsorption model and the breakthrough experiments is carried out
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Books on the topic "Isotherm model"

1

Esmele, Myles. A model for deformation of continuous fiber composites under isothermal creep and thermal cycling conditions. Monterey, Calif: Naval Postgraduate School, 1997.

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Savolainen, Pekka. Modeling of non-isothermal vapor membrane separation with thermodynamic models and generalized mass transfer equations. Lappeenranta, Finland: Lappeenranta University of Technology, 2002.

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IUTAM Symposium on Numerical Simulation of Non-Isothermal Flow of Viscoelastic Liquids (1993 Kerkrade, Netherlands). IUTAM Symposium on Numerical Simulation of Non-Isothermal Flow of Viscoelastic Liquids: Proceedings of an IUTAM symposium held in Kerkrade, the Netherlands, 1-3 November 1993. Dordrecht: Kluwer Academic Publishers, 1995.

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R, Coriell S., Sekerka R. F, and National Institute of Standards and Technology (U.S.), eds. Analytic solution for a non-axisymmetric isothermal dendrite. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1999.

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Carroni, Richard. Investigation and validation of a cubic turbulence model in isothermal and conducting flows. 1999.

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Numerical Modeling of Isothermal Groundwater and Geothermal Systems. Taylor & Francis Ltd, 2007.

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F, Kelton K., and United States. National Aeronautics and Space Administration., eds. Computer modeling of non-isothermal crystallization. 2nd ed. [Amsterdam: North-Holland, 1996.

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R, Coriell S., Sekerka R. F, and National Institute of Standards and Technology (U.S.), eds. Shape parameter for a non-axisymmetric isothermal dendrite. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1999.

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R, Coriell S., Sekerka R. F, and National Institute of Standards and Technology (U.S.), eds. Shape parameter for a non-axisymmetric isothermal dendrite. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1999.

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R, Coriell S., Sekerka R. F, and National Institute of Standards and Technology (U.S.), eds. Shape parameter for a non-axisymmetric isothermal dendrite. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1999.

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Book chapters on the topic "Isotherm model"

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Selmi, Taher, Mongi Seffen, François Brouers, Vanessa Fierro, and Habib Sammouda. "Adsorption of Model Dyes Onto Porous Materials: Effect of pH and Temperature on the Parameters of Brouers-Sotolongo Kinetic Fractal and Generalized Isotherm." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1039–41. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_299.

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Thoenes, Dirk. "Integral Isothermal Reactor Models." In Chemical Reactor Development, 193–220. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-015-8382-4_7.

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Lewicki, Piotr P., and Wanda Pomarańska-Łazuka. "Water Sorption Isotherms of Food Model Mixtures." In Developments in Food Engineering, 185–87. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2674-2_54.

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Huang, Rui Xin. "Heaving Signals in the Isothermal Coordinate." In Heaving, Stretching and Spicing Modes, 335–71. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2941-2_6.

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Murugesh, Solairajan, T. A. M. Msagati, Venkataraman Sivasankar, and R. Hariharan. "Adsorption Investigations: Kinetic and Isotherm Models, Determination of Thermodynamic Parameters." In Surface Modified Carbons as Scavengers for Fluoride from Water, 147–78. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40686-2_7.

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Peters, M. M., G. D. Peskett, and M. C. Brito. "Isothermal Model of a Warm Expander Pulse Tube." In Cryocoolers 9, 319–26. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5869-9_38.

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Buiķis, A., J. Cepītis, H. Kalis, and A. Reinfelds. "Non-Isothermal Mathematical Model of Wood and Paper Drying." In Progress in Industrial Mathematics at ECMI 2000, 488–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04784-2_65.

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Götz, T., and J. Struckmeier. "A Simplified Model for Non-Isothermal Crystallization of Polymers." In Progress in Industrial Mathematics at ECMI 2004, 227–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-28073-1_33.

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Mazzullo, S., R. Corrieri, and C. De Luigi. "Mathematical model for isobaric non-isothermal crystallization of polypropylene." In Progress in Industrial Mathematics at ECMI 96, 126–34. Wiesbaden: Vieweg+Teubner Verlag, 1997. http://dx.doi.org/10.1007/978-3-322-96688-9_14.

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Hu, Yayuan. "Isothermal Hyperelastic Model for Saturated Porous Media Based on Poromechanics." In Springer Series in Geomechanics and Geoengineering, 31–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97112-4_7.

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Conference papers on the topic "Isotherm model"

1

Zhang, Jian, Jianyong Hu, Weihua Lu, Deyou Liu, and Boqin Fan. "Research on the Mathematic Model of Air Valve." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37504.

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Air valve is an important measure of water hammer protection in long water distribution system. Volume of air inflow and outflow, the maximum volume of air inflow, and air mass flow rate are not only relate to prefer choose of air valve type, but effect on the safety of water distribution engineering. So it is important to make a theoretical calculation of air valve precisely. Traditional mathematic model of valve assumes that air inflows and outflows the pipeline by isentropic process, then isothermal variation will occur. Though this model is simple in theory and its programming is easy, its two thermodynamic processes are not incongruous obviously which results in its physical achievement unexplainable theoretically. Because the isentropic process is reversible adiabatic and no heat exchange occurs, but achievement of isotherm process need heat exchange sufficiently. This paper raises a new mathematic model of air valve based on those models reported so far. The new model gives up the hypothesis of isotherm, and proves rationality of this model by mathematical induction. Calculation results of two mathematic models are compared by numerical analysis. This provides scientific basis for precise simulation of air behavior through air valve and prefer choose of air valve type in long distribution system.
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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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Shuler, P. J. "Mathematical Model for the Scale-Inhibitor Squeeze Process Based on the Langmuir Adsorption Isotherm." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 1993. http://dx.doi.org/10.2118/25162-ms.

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Sharma, Alfa, Yogendra Kumar, and Parasharam M. Shirage. "Synthesis of humidity sensitive zinc stannate nanomaterials and modelling of Freundlich adsorption isotherm model." In DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5028726.

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Арбузов, Виталий, Vitaliy Arbuzov, Эдуард Арбузов, Eduard Arbuzov, Владимир Бердников, Vladimir Berdnikov, Юрий Дубнищев, et al. "Investigation of convective structures and phase transition induced by non-stationary boundary conditions in a horizontal layer of water." In 29th International Conference on Computer Graphics, Image Processing and Computer Vision, Visualization Systems and the Virtual Environment GraphiCon'2019. Bryansk State Technical University, 2019. http://dx.doi.org/10.30987/graphicon-2019-1-53-57.

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The evolution of convective structures and the phase transition induced by non-stationary boundary conditions in a horizontal water layer bounded by flat heat-exchange surfaces were studied by shear interferometry and numerical simulation methods. Numerical modeling of the temperature field as a field of isotherms in the mode of monotonous cooling of horizontal walls was performed. The problem of fragmentary reconstruction of hilbertograms and shear interferograms images from a numerical model of the isotherm field was solved. The hydrodynamics of convective currents, the coevolution of temperature fields, interference and Hilbert structures have been modeled and studied taking into account the inversion of water density in the vicinity of the isotherm (+4°C), under conditions of phase transition and growth of the ice layer on the lower heat transfer plane. The simulation was performed using a proprietary software package. The relevance of this kind of research is due to the special importance of convection in geodynamics, physics of the atmosphere and the ocean, in hydrodynamic and thermophysical processes associated with the formation and growth of crystals.
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6

Stempniewicz, M. M. "Coefficients for I-131 Sorption on Different Surfaces." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29290.

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Sorption of fission product vapors on metallic surfaces and dust particles is an important safety aspect of HTR reactors. Safety analyses of these reactors are performed using computer codes, such as MELCOR, RADAX, SPECTRA. These codes have sorption models allowing to compute the sorption rates of different fission products on surfaces. The code users must supply the model coefficients applicable for the particular surface and isotope. This paper describes the work performed to find relevant experimental data and find the sorption coefficients that represent well the available data for iodine on different surfaces. The purpose of this work is to generate a set of coefficients that may be recommended for the computer code users. Calculations were performed using the computer code SPECTRA. The following data was analyzed: • Sorption of I-131 on graphite; • Sorption of I-131 on steel; • Sorption of I-131 on dust. The results are summarized as follows: • The available data is provided in form of Langmuir isotherms. • The Langmuir isotherms do not provide sufficient data to define all sorption coefficients. The Langmuir isotherm provides equilibrium data; the relaxation time (to get to equilibrium) needs to be guessed. In practice this means that one of the sorption coefficients must be guessed. In the present calculations the desorption coefficient was being guessed and then varied in sensitivity calculations. The calculations showed that surface concentration is not sensitive to the choice of the parameter. • The sorption model in SPECTRA is capable to correctly reproduce the sorption behavior given by the Langmuir isotherms. • Out of the calculated cases, the highest activity (surface concentration) is observed on the steel surface; the lowest on the graphite surfaces. • The present work may serve as a useful guide of how to convert the Langmuir isotherm data into the input parameters required for computer code calculations.
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Han, Runping, Yinli Li, Jingjing Zhang, Lijun Zhang, Fuling Xie, Junmei Cheng, and Zhenhui Zhao. "Langmuir Isotherm and Pseudo Second Order Kinetic Model for the Biosorption of Methylene Blue Onto Rice Husk." In 2008 2nd International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.389.

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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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Gupta, Vandana, Athira Nair, and Saurabh Pandey. "A SUSTAINABLE APPROACH FOR TREATMENT OF WASTEWATER USING CHICKEN FEATHERS." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b1/v3/44.

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Since the last few decades, environmental remediation through a sustainable approach is gaining importance. One such attempt has been made in the present work to remove heavy metals from industrial effluents using one of the most prominent animal wastes, the chicken feathers. Biosorption has been a promising technique to remove heavy metals from industrial effluents. In the present work, cleaned but untreated chicken feathers were used to remove Cu(II) ions from electroplating industry wastewater. The physicochemical characteristics like colour, pH, ash content, iodine number and bulk density of chicken feathers were also determined. The FT-IR spectrum of chicken feathers did not show a recognizable difference after biosorption which indicated physical adsorption. The adsorption isotherm study showed that the Freundich isotherm model was the best fit as compared to Langmuir isotherm model. The results obtained were supported statistically by using Chi-square test. In the desorption study, EDTA was found to be a most effective desorbing agent in comparison with acid, alkali and deionized water. Thus, the present work explores the efficiency of chicken feathers to act as biosrbent as remove heavy metals from industrial effluents in a simple, economic and sustainable manner
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Alsaba, Wisam Hussam, Raafat Alenany, and Mohammed Zamzam. "Using Synthetic Resins for Removal of Emulsified Oil from Produced Water." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0103.

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In this study, adsorption of emulsified oil in produced water was experimented using synthetic resins. Adsorbent dosage, contact time, initial oil concentration, and PH were the main key parameters evaluated for Optipore L493, Amberlite IRA 958, Amberlite XAD 7 and Lewatit AF 5. Oil removal rates have reached up to 98% using AF 5, XAD 7 and L493, while they are lesser than 25% for IRA 958. Isotherm data were fitted using Langmuir, Freundlich, Toth, Flory Huggins and Dubinin-Radushkevich models. Adsorption isotherms for XAD 7 and L 493 were best fitted using Langmuir model, whereas AF 5 curves were best fitted using Dubinin-Radushkevich. Kinetic data describing the rate of adsorption for each resin were studied and fitted using pseudo-first and second order equations in addition to intraparticle diffusion models. The experimental results were best-fitted using pseudo second order kinetics. The obtained results confirm the applicability of the resins for the removal of oil from produced water.
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Reports on the topic "Isotherm model"

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Cantrell, Kirk J., R. Jeffrey Serne, and George V. Last. Applicability of the Linear Sorption Isotherm Model to Represent Contaminant Transport Processes in Site-Wide Performance Assessments. Office of Scientific and Technical Information (OSTI), September 2002. http://dx.doi.org/10.2172/956903.

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FOGWELL, T. W., and G. V. LAST. Applicability of the Linear Sorption Isotherm Model to Represent Contaminant Transport Processes in Site Wide Performance Assessments. Office of Scientific and Technical Information (OSTI), July 2003. http://dx.doi.org/10.2172/814768.

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Wheeler, A. A., W. J. Boettinger, and G. B. McFadden. A phase-field model for isothermal phase transitions in binary alloys. Gaithersburg, MD: National Institute of Standards and Technology, 1991. http://dx.doi.org/10.6028/nist.ir.4662.

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tajima, Toshi. A kinetic model for the one-dimensional electromagnetic solitons in an isothermal plasmapdf. Office of Scientific and Technical Information (OSTI), February 2002. http://dx.doi.org/10.2172/799002.

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Kimber, Mark, John Brigham, and Anirban Jana. Experimentally Validated Numerical Models of Non-Isothermal Turbulent Mixing in High Temperature Reactors. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1461189.

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Laskowski, Gregory Michael. Predictions of flow through an isothermal serpentine passage with linear eddy-viscosity Reynolds Averaged Navier Stokes models. Office of Scientific and Technical Information (OSTI), December 2005. http://dx.doi.org/10.2172/875612.

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Glass, R. J., M. J. Nicholl, and V. C. Tidwell. Challenging and improving conceptual models for isothermal flow in unsaturated, fractured rock through exploration of small-scale processes. Office of Scientific and Technical Information (OSTI), July 1996. http://dx.doi.org/10.2172/266709.

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Woods, A. L., S. Senthooran, and S. Parameswaran. Application of a new time scale based low {kappa}-{var_epsilon} model to natural convection from a semi-infinite vertical isothermal plate. Office of Scientific and Technical Information (OSTI), January 1999. http://dx.doi.org/10.2172/307881.

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Pan, L., C. M. Oldenburg, Y. S. Wu, and K. Pruess. T2Well/ECO2N Version 1.0: Multiphase and Non-Isothermal Model for Coupled Wellbore-Reservoir Flow of Carbon Dioxide and Variable Salinity Water. Office of Scientific and Technical Information (OSTI), February 2011. http://dx.doi.org/10.2172/1007233.

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Lamontage, Robert A., and Richard A. Matuszko. Theoretical Aspects of Multicomponent Adsorption Equilibria. Part I: Development of a Computationally Fast Adsorption Isothem Model That Can be Applied to Systems Which Demonstrate Energetic Heterogeneity. Fort Belvoir, VA: Defense Technical Information Center, April 1997. http://dx.doi.org/10.21236/ada325445.

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