The Experts below are selected from a list of 201 Experts worldwide ranked by ideXlab platform
Minoru Nishida - One of the best experts on this subject based on the ideXlab platform.
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Effect of Aging on Martensitic Transformation in Ti-Rich Ti-Pd Shape Memory Alloy
MATERIALS TRANSACTIONS, 2002Co-Authors: Virgil C. Solomon, Minoru NishidaAbstract:Effect of aging on Successive martensitic Transformation in a Ti–47 at%Pd shape memory alloy has been studied by means of differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). After short time aging Successive Transformation takes place in Ti–47 at%Pd alloy irrespective of aging temperature. On the other hand, after relatively prolonged period only the specimen aged above 1073 K shows Successive Transformation. The change of Transformation behavior with aging condition is discussed on the basis of equilibrium between TiPd matrix and Ti2Pd precipitate. The homogeneity range of TiPd compound is also estimated from the Transformation behavior and TEM observations.
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Effect of aging on martensitic Transformation in Ti-rich Ti-Pd shape memory alloy : Special issue on smart materials-fundamentals and applications
Materials Transactions Jim, 2002Co-Authors: Virgil C. Solomon, Minoru NishidaAbstract:Effect of aging on Successive martensitic Transformation in a Ti-47 at%Pd shape memory alloy has been studied by means of differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). After short time aging Successive Transformation takes place in Ti-47 at%Pd alloy irrespective of aging temperature. On the other hand, after relatively prolonged period only the specimen aged above 1073 K shows Successive Transformation. The change of Transformation behavior with aging condition is discussed on the basis of equilibrium between TiPd matrix and Ti 2 Pd precipitate. The homogeneity range of TiPd compound is also estimated from the Transformation behavior and TEM observations.
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Martensitic Transformation in Ti-Rich Ti-Pd Shape Memory Alloys
MATERIALS TRANSACTIONS, 2002Co-Authors: Virgil C. Solomon, Minoru NishidaAbstract:A systematic study on martensitic Transformation in Ti-rich Ti–Pd alloys has been carried out using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The alloys quenched from the single region of B2 parent phase show a Successive Transformation during DSC measurement. On the other hand, the furnace-cooled alloys show a single Transformation. The Successive Transformation behavior is closely related to the formation of fine Ti2Pd precipitates with C11b-type structure during Transformation cycle. The first peak on DSC heating curve is attributable to the reverse martensitic Transformation of the TiPd matrix, while the second one is due to the reverse martensitic Transformation in local regions around the Ti2Pd precipitates where Pd concentration is higher than that in matrix. Morphological characteristics of the precipitate are also discussed.
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Martensitic Transformation in Ti-rich Ti-Pd shape memory alloys : Special issue on smart materials-fundamentals and applications
Materials Transactions Jim, 2002Co-Authors: Virgil C. Solomon, Minoru NishidaAbstract:A systematic study on martensitic Transformation in Ti-rich Ti-Pd alloys has been carried out using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The alloys quenched from the single region of B2 parent phase show a Successive Transformation during DSC measurement. On the other hand, the furnace-cooled alloys show a single Transformation. The Successive Transformation behavior is closely related to the formation of fine Ti 2 Pd precipitates with C11 b -type structure during Transformation cycle. The first peak on DSC heating curve is attributable to the reverse martensitic Transformation of the TiPd matrix, while the second one is due to the reverse martensitic Transformation in local regions around the Ti 2 Pd precipitates where Pd concentration is higher than that in matrix. Morphological characteristics of the precipitate are also discussed.
Virgil C. Solomon - One of the best experts on this subject based on the ideXlab platform.
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Effect of Aging on Martensitic Transformation in Ti-Rich Ti-Pd Shape Memory Alloy
MATERIALS TRANSACTIONS, 2002Co-Authors: Virgil C. Solomon, Minoru NishidaAbstract:Effect of aging on Successive martensitic Transformation in a Ti–47 at%Pd shape memory alloy has been studied by means of differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). After short time aging Successive Transformation takes place in Ti–47 at%Pd alloy irrespective of aging temperature. On the other hand, after relatively prolonged period only the specimen aged above 1073 K shows Successive Transformation. The change of Transformation behavior with aging condition is discussed on the basis of equilibrium between TiPd matrix and Ti2Pd precipitate. The homogeneity range of TiPd compound is also estimated from the Transformation behavior and TEM observations.
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Effect of aging on martensitic Transformation in Ti-rich Ti-Pd shape memory alloy : Special issue on smart materials-fundamentals and applications
Materials Transactions Jim, 2002Co-Authors: Virgil C. Solomon, Minoru NishidaAbstract:Effect of aging on Successive martensitic Transformation in a Ti-47 at%Pd shape memory alloy has been studied by means of differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). After short time aging Successive Transformation takes place in Ti-47 at%Pd alloy irrespective of aging temperature. On the other hand, after relatively prolonged period only the specimen aged above 1073 K shows Successive Transformation. The change of Transformation behavior with aging condition is discussed on the basis of equilibrium between TiPd matrix and Ti 2 Pd precipitate. The homogeneity range of TiPd compound is also estimated from the Transformation behavior and TEM observations.
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Martensitic Transformation in Ti-Rich Ti-Pd Shape Memory Alloys
MATERIALS TRANSACTIONS, 2002Co-Authors: Virgil C. Solomon, Minoru NishidaAbstract:A systematic study on martensitic Transformation in Ti-rich Ti–Pd alloys has been carried out using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The alloys quenched from the single region of B2 parent phase show a Successive Transformation during DSC measurement. On the other hand, the furnace-cooled alloys show a single Transformation. The Successive Transformation behavior is closely related to the formation of fine Ti2Pd precipitates with C11b-type structure during Transformation cycle. The first peak on DSC heating curve is attributable to the reverse martensitic Transformation of the TiPd matrix, while the second one is due to the reverse martensitic Transformation in local regions around the Ti2Pd precipitates where Pd concentration is higher than that in matrix. Morphological characteristics of the precipitate are also discussed.
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Martensitic Transformation in Ti-rich Ti-Pd shape memory alloys : Special issue on smart materials-fundamentals and applications
Materials Transactions Jim, 2002Co-Authors: Virgil C. Solomon, Minoru NishidaAbstract:A systematic study on martensitic Transformation in Ti-rich Ti-Pd alloys has been carried out using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The alloys quenched from the single region of B2 parent phase show a Successive Transformation during DSC measurement. On the other hand, the furnace-cooled alloys show a single Transformation. The Successive Transformation behavior is closely related to the formation of fine Ti 2 Pd precipitates with C11 b -type structure during Transformation cycle. The first peak on DSC heating curve is attributable to the reverse martensitic Transformation of the TiPd matrix, while the second one is due to the reverse martensitic Transformation in local regions around the Ti 2 Pd precipitates where Pd concentration is higher than that in matrix. Morphological characteristics of the precipitate are also discussed.
Mushtaq Ahmed - One of the best experts on this subject based on the ideXlab platform.
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On Two-Dimensional Variable Viscosity Fluid Motion with Body Forcefor Intermediate Peclet Number Via von-Mises Coordinates
International Journal of Fluid Mechanics & Thermal Sciences, 2019Co-Authors: Mushtaq AhmedAbstract:This article uses von-Mises coordinates to present a class of new exact solutions of the system of partial differential equations for the plane steady motion of incompressible fluid of variable viscosity in presence of body forcefor moderate Peclet number. This communication applies Successive Transformation technique and characterizes streamlines through an equation relating a differentiable function f(x) and a function of stream function. Considering the function of stream function satisfies a specific relation, the exact solutions for moderate Peclet number with body force are determined for given one component of the body force when f(x) takes a specific value and when it is not. In both the cases, it shows an infinite set of streamlines, the velocity components, viscosity function, generalized energy function and temperature distribution for intermediate Peclet number in presence of body force. When f(x) takes a specific value, a relation between viscosity and temperature function is observed.
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A Class of Exact Solutions for a Variable Viscosity Flow with Body Force for Moderate Peclet Number ViaVon-Mises Coordinates
Food Microbiology, 2019Co-Authors: Mushtaq AhmedAbstract:The objective of this article is to communicate a class of new exact solutions of the plane equation of momentum with body force, energy and continuity for moderate Peclet number in von-Mises coordinates. Viscosity of fluid is variable but its density and thermal conductivity are constant. The class characterizes the streamlines pattern through an equation relating two continuously differentiable functions and a function of stream function ψ. Applying the Successive Transformation technique, the basic equations are prepared for exact solutions. It finds exact solutions for class of flows for which the function of stream function varies linearly and exponentially. The linear case shows viscosity and temperature for moderate Peclet number for two variety of velocity profile. The first velocity profile fixes both the functions of characteristic equation whereas the second keeps one of them arbitrary. The exponential case finds that the temperature distribution, due to heat generation, remains constant for all Peclet numbers except at 4 where it follows a specific formula. There are streamlines, velocity components, viscosity and temperature distribution in presence of body force for a large number of the finite Peclet number.
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A Class of New Exact Solution of Equations for Motion of Variable Viscosity Fluid in Presence of Body Force with Moderate Peclet Number
2019Co-Authors: Mushtaq AhmedAbstract:This is to communicate a class of new exact solutions of the equations governing the steady plane motion of fluid with constant density, constant thermal conductivity but variable viscosity and body force term to the right-hand side of Navier-Stokes equations with moderate Peclet numbers. Exact solutions are obtained for Peclet numbers between zero and infinity except 2, for given one component of the body force using Successive Transformation technique and a new characterization for the streamlines. A temperature distribution formula, due to heat generation, is obtained when Peclet number is 4 other wise temperature distribution is found to be constant. The exact solutions are large in number as streamlines, velocity components, viscosity function, and energy function and temperature distribution in presence of body force exists for a huge number of the moderate Peclet number.
Rene Verwaal - One of the best experts on this subject based on the ideXlab platform.
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high level production of beta carotene in saccharomyces cerevisiae by Successive Transformation with carotenogenic genes from xanthophyllomyces dendrorhous
Applied and Environmental Microbiology, 2007Co-Authors: Rene Verwaal, Jing Wang, Jeanpaul Meijnen, Hans Visser, Gerhard Sandmann, Johan A Van Den Berg, Albert J J Van OoyenAbstract:To determine whether Saccharomyces cerevisiae can serve as a host for efficient carotenoid and especially β-carotene production, carotenogenic genes from the carotenoid-producing yeast Xanthophyllomyces dendrorhous were introduced and overexpressed in S. cerevisiae. Because overexpression of these genes from an episomal expression vector resulted in unstable strains, the genes were integrated into genomic DNA to yield stable, carotenoid-producing S. cerevisiae cells. Furthermore, carotenoid production levels were higher in strains containing integrated carotenogenic genes. Overexpression of crtYB (which encodes a bifunctional phytoene synthase and lycopene cyclase) and crtI (phytoene desaturase) from X. dendrorhous was sufficient to enable carotenoid production. Carotenoid production levels were increased by additional overexpression of a homologous geranylgeranyl diphosphate (GGPP) synthase from S. cerevisiae that is encoded by BTS1. Combined overexpression of crtE (heterologous GGPP synthase) from X. dendrorhous with crtYB and crtI and introduction of an additional copy of a truncated 3-hydroxy-3-methylglutaryl-coenzyme A reductase gene (tHMG1) into carotenoid-producing cells resulted in a Successive increase in carotenoid production levels. The strains mentioned produced high levels of intermediates of the carotenogenic pathway and comparable low levels of the preferred end product β-carotene, as determined by high-performance liquid chromatography. We finally succeeded in constructing an S. cerevisiae strain capable of producing high levels of β-carotene, up to 5.9 mg/g (dry weight), which was accomplished by the introduction of an additional copy of crtI and tHMG1 into carotenoid-producing yeast cells. This transformant is promising for further development toward the biotechnological production of β-carotene by S. cerevisiae.
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High-Level Production of Beta-Carotene in Saccharomyces cerevisiae by Successive Transformation with Carotenogenic Genes from Xanthophyllomyces dendrorhous
Applied and environmental microbiology, 2007Co-Authors: Rene Verwaal, Jing Wang, Jeanpaul Meijnen, Hans Visser, Gerhard Sandmann, Johan A. Van Den Berg, Albert J. J. Van OoyenAbstract:To determine whether Saccharomyces cerevisiae can serve as a host for efficient carotenoid and especially beta-carotene production, carotenogenic genes from the carotenoid-producing yeast Xanthophyllomyces dendrorhous were introduced and overexpressed in S. cerevisiae. Because overexpression of these genes from an episomal expression vector resulted in unstable strains, the genes were integrated into genomic DNA to yield stable, carotenoid-producing S. cerevisiae cells. Furthermore, carotenoid production levels were higher in strains containing integrated carotenogenic genes. Overexpression of crtYB (which encodes a bifunctional phytoene synthase and lycopene cyclase) and crtI (phytoene desaturase) from X. dendrorhous was sufficient to enable carotenoid production. Carotenoid production levels were increased by additional overexpression of a homologous geranylgeranyl diphosphate (GGPP) synthase from S. cerevisiae that is encoded by BTS1. Combined overexpression of crtE (heterologous GGPP synthase) from X. dendrorhous with crtYB and crtI and introduction of an additional copy of a truncated 3-hydroxy-3-methylglutaryl-coenzyme A reductase gene (tHMG1) into carotenoid-producing cells resulted in a Successive increase in carotenoid production levels. The strains mentioned produced high levels of intermediates of the carotenogenic pathway and comparable low levels of the preferred end product beta-carotene, as determined by high-performance liquid chromatography. We finally succeeded in constructing an S. cerevisiae strain capable of producing high levels of beta-carotene, up to 5.9 mg/g (dry weight), which was accomplished by the introduction of an additional copy of crtI and tHMG1 into carotenoid-producing yeast cells. This transformant is promising for further development toward the biotechnological production of beta-carotene by S. cerevisiae.
Albert J J Van Ooyen - One of the best experts on this subject based on the ideXlab platform.
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high level production of beta carotene in saccharomyces cerevisiae by Successive Transformation with carotenogenic genes from xanthophyllomyces dendrorhous
Applied and Environmental Microbiology, 2007Co-Authors: Rene Verwaal, Jing Wang, Jeanpaul Meijnen, Hans Visser, Gerhard Sandmann, Johan A Van Den Berg, Albert J J Van OoyenAbstract:To determine whether Saccharomyces cerevisiae can serve as a host for efficient carotenoid and especially β-carotene production, carotenogenic genes from the carotenoid-producing yeast Xanthophyllomyces dendrorhous were introduced and overexpressed in S. cerevisiae. Because overexpression of these genes from an episomal expression vector resulted in unstable strains, the genes were integrated into genomic DNA to yield stable, carotenoid-producing S. cerevisiae cells. Furthermore, carotenoid production levels were higher in strains containing integrated carotenogenic genes. Overexpression of crtYB (which encodes a bifunctional phytoene synthase and lycopene cyclase) and crtI (phytoene desaturase) from X. dendrorhous was sufficient to enable carotenoid production. Carotenoid production levels were increased by additional overexpression of a homologous geranylgeranyl diphosphate (GGPP) synthase from S. cerevisiae that is encoded by BTS1. Combined overexpression of crtE (heterologous GGPP synthase) from X. dendrorhous with crtYB and crtI and introduction of an additional copy of a truncated 3-hydroxy-3-methylglutaryl-coenzyme A reductase gene (tHMG1) into carotenoid-producing cells resulted in a Successive increase in carotenoid production levels. The strains mentioned produced high levels of intermediates of the carotenogenic pathway and comparable low levels of the preferred end product β-carotene, as determined by high-performance liquid chromatography. We finally succeeded in constructing an S. cerevisiae strain capable of producing high levels of β-carotene, up to 5.9 mg/g (dry weight), which was accomplished by the introduction of an additional copy of crtI and tHMG1 into carotenoid-producing yeast cells. This transformant is promising for further development toward the biotechnological production of β-carotene by S. cerevisiae.
