The Experts below are selected from a list of 1776 Experts worldwide ranked by ideXlab platform
Bahram Moshfegh - One of the best experts on this subject based on the ideXlab platform.
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modeling an industrial energy system perspectives on regional heat cooperation
International Journal of Energy Research, 2008Co-Authors: Sofia Klugman, Magnus Karlsson, Bahram MoshfeghAbstract:Through energy efficiency measures, it is possible to reduce heat surplus in the Pulp and paper industry. Yet Pulp and paper mills situated in countries with a heat demand for residential and commercial buildings for the major part of the year are potential heat suppliers. However, striving to utilize the heat within the mills for efficient energy use could conflict with the delivery of excess heat to a district heating system. As part of a project to optimize a regional energy system, a Sulfate Pulp mill situated in central Sweden is analyzed, focusing on providing heat and electricity to the mill and its surrounding energy systems. An energy system optimization method based on mixed integer linear programming is used for studying energy system measures on an aggregated level. An extended system, where the mill is integrated in a regional heat market (HM), is evaluated in parallel with the present system. The use of either hot sewage or a heat pump for heat deliveries is analyzed along with process integration measures. The benefits of adding a condensing unit to the back-pressure steam turbine are also investigated. The results show that the use of hot sewage or a heat pump for heat deliveries is beneficial only in combination with extended heat deliveries to an HM. Process integration measures are beneficial and even increase the benefit of selling more heat for district heating. Adding a condensing turbine unit is most beneficial in combination with extended heat deliveries and process integration.
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a scandinavian chemical wood Pulp mill part 2 international and model mills comparison
Applied Energy, 2007Co-Authors: Sofia Klugman, Magnus Karlsson, Bahram MoshfeghAbstract:The energy use at a Swedish chemical wood-Pulp mill is compared internationally and for two model mills that aim to use the most efficient available technology. The international comparison is performed between Canadian and Scandinavian Pulp-mills on a general level, and on a closer level among eleven Swedish and Finnish non-integrated Sulfate Pulp-mills, the type of mill considered in the case study. The two model mills that are used for comparison are one Swedish and one Canadian. The Scandinavian Pulp-mills are somewhat more energy efficient than the Canadian mills. Still, the variation in energy use is remarkably large among the Scandinavian mills, which indicates that the energy-saving potential is great. If all Swedish freestanding Sulfate Pulp-mills became as energy efficient as the most efficient Scandinavian mill, electricity savings corresponding to nearly 1% of the national electricity use would be obtained. In the model mills comparison it was found that large amounts of heat could be saved, particularly in the evaporation plant.
De Martin, Alexandre Sigrist - One of the best experts on this subject based on the ideXlab platform.
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Reparo de perfurações na furca de dentes de cães, seladas com endomethasone com e sem barreiras de hidroxido e sulfato de calcio
[s.n.], 2018Co-Authors: De Martin, Alexandre SigristAbstract:Orientador: Luiz ValdrighiTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: A reparação de perfurações radiculares na região de furca de dentes, seladas imediatamente foi avaliada clínica, histológica e radiograficamente. Vinte e quatro dentes pré-molares inferiores, de cães adultos jovens, receberam perfurações experimentais na região de furca. Os materiais utilizados para a pesquisa foram: o Endomethasone, o cimento de hidróxido de cálcio e o sulfato de cálcio. O Endomethasone foi o material utilizado para o preenchimento do trajeto das perfurações, enquanto o cimento de hidróxido de cálcio e o sulfato de cálcio foram utilizados como anteparo, ou barreira para melhorar as condições de condensar o Endomethasone. Os dentes foram selados com resina composta fotopolimerizável precedida de condicionamento ácido e aplicação de adesivo dentinário. Após períodos experimentais, de 14 e 90 dias, os animais foram sacrificados e as estruturas anatomicas foram processadas para a análise histológica no microscópio óptico. A avaliação clínica mostrou que não houve envolvimento periodontal dos dentes analisados. Radiograftcamente, após 90 dias, não foram observadas perdas ósseas significativas. As avaliações histopatológicas mostraram que a colocação de uma barreira melhora as condições de condensação do material selador e tende a evitar sua extrusão e que não houve, em nenhum dos casos analisados, a completa reparação das perfurações com material calcificadoAbstract: The purpose of the present study was to evaluate the histological and radiological response to two. materials used as a matrix under a zinc oxide-eugenol cement used as a sealant in the repair of furcation perforations in experimental animals. After anesthesia, rootcanal treatment of canaIs with zinc oxide-eugenol cement, furcal perforations were made in 24 lower premolar (p3 and P4) teeth of mongrel dogs, with L.N. burs. The perforated teeth were random1y divided into 3 groups of 8 teeth: Group I - perforations sealed with Endomethasone; Group II - perforations sealed with Endomethasone after the placement of an internal matrix of calcium hydroxide; Group m - perforations sealed with Endomethasone after the placement of an internal matrix of calcium Sulfate. Pulp chamber of all teeth were filled with composite resin after acid etching and application of dentinal adhesive. Animals were sacrificed after 14 and 90 days. The teeth and surrounding structures were processed for light microscopy. The conclusion of this study is that a placement of a barrier at the Pulp chamber aspect of a furcation perforation did not result in superior healing, compared with the use of zinc oxide-eugenol cement alone and complete healing of furcation perforations with hard tissue was not observed.DoutoradoEndodontiaDoutor em Clínica Odontológic
Alexandre Sigrist De Martin - One of the best experts on this subject based on the ideXlab platform.
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Reparo de perfurações na furca de dentes de cães, seladas com endomethasone com e sem barreiras de hidroxido e sulfato de calcio
2017Co-Authors: Alexandre Sigrist De MartinAbstract:Resumo: A reparação de perfurações radiculares na região de furca de dentes, seladas imediatamente foi avaliada clínica, histológica e radiograficamente. Vinte e quatro dentes pré-molares inferiores, de cães adultos jovens, receberam perfurações experimentais na região de furca. Os materiais utilizados para a pesquisa foram: o Endomethasone, o cimento de hidróxido de cálcio e o sulfato de cálcio. O Endomethasone foi o material utilizado para o preenchimento do trajeto das perfurações, enquanto o cimento de hidróxido de cálcio e o sulfato de cálcio foram utilizados como anteparo, ou barreira para melhorar as condições de condensar o Endomethasone. Os dentes foram selados com resina composta fotopolimerizável precedida de condicionamento ácido e aplicação deadesivo dentinário. Após períodos experimentais, de 14 e 90 dias, os animais foram sacrificados e as estruturas anatomicas foram processadas para a análise histológica no microscópio óptico. A avaliação clínica mostrou que não houve envolvimento periodontal dos dentes analisados. Radiograftcamente, após 90 dias, não foram observadas perdas ósseas significativas. As avaliações histopatológicas mostraram que a colocação de uma barreira melhora as condições de condensação do material selador e tende a evitar sua extrusão e que não houve, em nenhum dos casos analisados, a completa reparação das perfurações com material calcificadoAbstract: The purpose of the present study was to evaluate the histological and radiological response to two. materials used as a matrix under a zinc oxide-eugenol cement used as a sealant in the repair of furcation perforations in experimental animals. After anesthesia, rootcanal treatment of canaIs with zinc oxide-eugenol cement, furcal perforations were made in 24 lower premolar (p3 and P4) teeth of mongrel dogs, with L.N. burs. The perforated teeth were random1y divided into 3 groups of 8 teeth: Group I - perforations sealed with Endomethasone; Group II - perforations sealed with Endomethasone after the placement of an internal matrix of calcium hydroxide; Group m - perforations sealed with Endomethasone after the placement of an internal matrix of calcium Sulfate. Pulp chamber of all teeth were filled with composite resin after acid etching and application of dentinal adhesive. Animals were sacrificed after 14 and 90 days. The teeth and surrounding structures were processed for light microscopy. The conclusion of this study is that a placement of a barrier at the Pulp chamber aspect of a furcation perforation did not result in superior healing, compared with the use of zinc oxide-eugenol cement alone and complete healing of furcation perforations with hard tissue was not observe
Sofia Klugman - One of the best experts on this subject based on the ideXlab platform.
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modeling an industrial energy system perspectives on regional heat cooperation
International Journal of Energy Research, 2008Co-Authors: Sofia Klugman, Magnus Karlsson, Bahram MoshfeghAbstract:Through energy efficiency measures, it is possible to reduce heat surplus in the Pulp and paper industry. Yet Pulp and paper mills situated in countries with a heat demand for residential and commercial buildings for the major part of the year are potential heat suppliers. However, striving to utilize the heat within the mills for efficient energy use could conflict with the delivery of excess heat to a district heating system. As part of a project to optimize a regional energy system, a Sulfate Pulp mill situated in central Sweden is analyzed, focusing on providing heat and electricity to the mill and its surrounding energy systems. An energy system optimization method based on mixed integer linear programming is used for studying energy system measures on an aggregated level. An extended system, where the mill is integrated in a regional heat market (HM), is evaluated in parallel with the present system. The use of either hot sewage or a heat pump for heat deliveries is analyzed along with process integration measures. The benefits of adding a condensing unit to the back-pressure steam turbine are also investigated. The results show that the use of hot sewage or a heat pump for heat deliveries is beneficial only in combination with extended heat deliveries to an HM. Process integration measures are beneficial and even increase the benefit of selling more heat for district heating. Adding a condensing turbine unit is most beneficial in combination with extended heat deliveries and process integration.
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a scandinavian chemical wood Pulp mill part 2 international and model mills comparison
Applied Energy, 2007Co-Authors: Sofia Klugman, Magnus Karlsson, Bahram MoshfeghAbstract:The energy use at a Swedish chemical wood-Pulp mill is compared internationally and for two model mills that aim to use the most efficient available technology. The international comparison is performed between Canadian and Scandinavian Pulp-mills on a general level, and on a closer level among eleven Swedish and Finnish non-integrated Sulfate Pulp-mills, the type of mill considered in the case study. The two model mills that are used for comparison are one Swedish and one Canadian. The Scandinavian Pulp-mills are somewhat more energy efficient than the Canadian mills. Still, the variation in energy use is remarkably large among the Scandinavian mills, which indicates that the energy-saving potential is great. If all Swedish freestanding Sulfate Pulp-mills became as energy efficient as the most efficient Scandinavian mill, electricity savings corresponding to nearly 1% of the national electricity use would be obtained. In the model mills comparison it was found that large amounts of heat could be saved, particularly in the evaporation plant.
Fai Cal Larachi - One of the best experts on this subject based on the ideXlab platform.
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oxidation kinetics of iron ii complexes of trans 1 2 diaminocyclohexanetetraacetate cdta with dissolved oxygen reaction mechanism parameters of activation and kinetic salt effects
Chemical Engineering Science, 2006Co-Authors: Simon Piche, Fai Cal LarachiAbstract:The present investigation takes concern about a spiny environmental problem afflicting the Pulp mill industry exploiting the Kraft Sulfate-Pulp process where dilute total reduced sulfur contaminants are co-mixed with oxygen in large-volume gas effluents. A potential Redox process for removing the total reduced sulfurs consists in oxidizing them by means of iron(III) organometallic complexes while the co-mixed oxygen mediates the oxidative regeneration of iron(II) into iron(III) complexes. In this work, the oxidation kinetics of iron(II) trans-1,2,-diaminocyclohexanetetraacetate (cdta) complexes with molecular oxygen (O2) as the source oxidant was investigated for a wide pH range (1.75 10pH>10, was found to be less reactive than Fe3+cdta4-Fe3+cdta4- with the superoxide intermediate (O2·-), thus reducing the effect of the reverse step at higher pH. A study on the effect of electrolytes on the reaction rate led to the conclusion that salts increase the rate constant k1,appk1,app. Finally, kinetic results in acidic conditions leading to the formation of other iron(II)–cdta complexes (i.e., Fe2+cdta4-H+Fe2+cdta4-H+) and another superoxide intermediates (HO2·) are reported and discussed.
