The Experts below are selected from a list of 10125 Experts worldwide ranked by ideXlab platform
Izumi Hirasawa - One of the best experts on this subject based on the ideXlab platform.
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effect of ultrasonic irradiation on the crystallization of sodium acetate trihydrate utilized as heat storage material
Chemical Engineering & Technology, 2012Co-Authors: Kiwamu Seo, Shunpei Suzuki, Takuya Kinoshita, Izumi HirasawaAbstract:The effect of ultrasonic irradiation on Nucleation Phenomena in the heat storage material CH3COONa · 3H2O was investigated by measuring the Nucleation probability and induction time. The experimental results show that the concentration of CH3COONa should be operated in the optimum range for CH3COONa · 3H2O-selective crystallization. Furthermore, the Nucleation probability increased and the induction time decreased with increasing energy input. Consequently, the optimum conditions of ultrasonic irradiation of CH3COONa · 3H2O are 53 wt-% CH3COONa, 3.0 W of energy input, and ΔT = 10–68 K.
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investigation of primary Nucleation Phenomena of acetylsalicylic acid crystals induced by ultrasonic irradiation ultrasonic energy needed to activate primary Nucleation
Journal of Crystal Growth, 2006Co-Authors: Etsuko Miyasaka, Satomi Ebihara, Izumi HirasawaAbstract:Abstract The purpose of our study is to clarify ultrasonic primary Nucleation Phenomena for controlling final product size by adjusting the number of primary nuclei. In our previous study, the effect of ultrasonic irradiation on the number of nuclei was investigated under the same supersaturated condition, as a result two novel Phenomena were observed. First, there is a region where ultrasonic irradiation inhibits primary Nucleation. Second, a specific amount of energy is needed to activate primary Nucleation. From this result, it was expected that the ultrasonic energy needed to activate primary Nucleation has a certain relationship to the energy necessary to form a stable nucleus. Therefore, we investigated the following: whether ultrasonic irradiation inhibits and activates primary Nucleation at various degrees of supersaturation, whether final crystal size relates to the number of nuclei, and whether the ultrasonic energy needed to activate primary Nucleation relates to the energy necessary to form a stable nucleus. First, we found that ultrasonic irradiation inhibits and activates primary Nucleation at various supersaturated degrees. Second, we found that final crystal size increases or decreases depending on the number of nuclei. Therefore, it was indicated that ultrasonic energy could yield the desired crystal size by inducing suitable Nucleation. Third, we found that the ultrasonic energy needed to activate primary Nucleation decreases with a decrease in the energy necessary to form a stable nucleus. From this, we can propose criteria for determining the effect of ultrasonic irradiation on primary Nucleation by showing diagrams correlating Δ G crit with E crit .
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Investigation of primary Nucleation Phenomena of acetylsalicylic acid crystals induced by ultrasonic irradiation—ultrasonic energy needed to activate primary Nucleation
Journal of Crystal Growth, 2006Co-Authors: Etsuko Miyasaka, Satomi Ebihara, Izumi HirasawaAbstract:Abstract The purpose of our study is to clarify ultrasonic primary Nucleation Phenomena for controlling final product size by adjusting the number of primary nuclei. In our previous study, the effect of ultrasonic irradiation on the number of nuclei was investigated under the same supersaturated condition, as a result two novel Phenomena were observed. First, there is a region where ultrasonic irradiation inhibits primary Nucleation. Second, a specific amount of energy is needed to activate primary Nucleation. From this result, it was expected that the ultrasonic energy needed to activate primary Nucleation has a certain relationship to the energy necessary to form a stable nucleus. Therefore, we investigated the following: whether ultrasonic irradiation inhibits and activates primary Nucleation at various degrees of supersaturation, whether final crystal size relates to the number of nuclei, and whether the ultrasonic energy needed to activate primary Nucleation relates to the energy necessary to form a stable nucleus. First, we found that ultrasonic irradiation inhibits and activates primary Nucleation at various supersaturated degrees. Second, we found that final crystal size increases or decreases depending on the number of nuclei. Therefore, it was indicated that ultrasonic energy could yield the desired crystal size by inducing suitable Nucleation. Third, we found that the ultrasonic energy needed to activate primary Nucleation decreases with a decrease in the energy necessary to form a stable nucleus. From this, we can propose criteria for determining the effect of ultrasonic irradiation on primary Nucleation by showing diagrams correlating Δ G crit with E crit .
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Effect of ultrasonic irradiation on Nucleation Phenomena in a Na2HPO4.12H2O melt being used as a heat storage material.
Ultrasonics sonochemistry, 2005Co-Authors: Etsuko Miyasaka, Masakazu Takai, Hideto Hidaka, Yoshihide Kakimoto, Izumi HirasawaAbstract:Abstract The effect of ultrasound on Nucleation Phenomena in the heat storage material Na2HPO4 · 12H2O was investigated by determining the primary Nucleation probability and induction time, and by looking at heat generation Phenomena in the initial stage of Nucleation. The experimental results show that the primary Nucleation probability dramatically increased, and the induction time decreased under the ultrasound irradiation, and in addition, the rate of temperature rise was dependent upon the ultrasonic output. Based on these results and the theoretical relationship between the number of primary nuclei and the heat generation rate, it is proposed that the number of primary nuclei depends upon the ultrasonic output.
Etsuko Miyasaka - One of the best experts on this subject based on the ideXlab platform.
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investigation of primary Nucleation Phenomena of acetylsalicylic acid crystals induced by ultrasonic irradiation ultrasonic energy needed to activate primary Nucleation
Journal of Crystal Growth, 2006Co-Authors: Etsuko Miyasaka, Satomi Ebihara, Izumi HirasawaAbstract:Abstract The purpose of our study is to clarify ultrasonic primary Nucleation Phenomena for controlling final product size by adjusting the number of primary nuclei. In our previous study, the effect of ultrasonic irradiation on the number of nuclei was investigated under the same supersaturated condition, as a result two novel Phenomena were observed. First, there is a region where ultrasonic irradiation inhibits primary Nucleation. Second, a specific amount of energy is needed to activate primary Nucleation. From this result, it was expected that the ultrasonic energy needed to activate primary Nucleation has a certain relationship to the energy necessary to form a stable nucleus. Therefore, we investigated the following: whether ultrasonic irradiation inhibits and activates primary Nucleation at various degrees of supersaturation, whether final crystal size relates to the number of nuclei, and whether the ultrasonic energy needed to activate primary Nucleation relates to the energy necessary to form a stable nucleus. First, we found that ultrasonic irradiation inhibits and activates primary Nucleation at various supersaturated degrees. Second, we found that final crystal size increases or decreases depending on the number of nuclei. Therefore, it was indicated that ultrasonic energy could yield the desired crystal size by inducing suitable Nucleation. Third, we found that the ultrasonic energy needed to activate primary Nucleation decreases with a decrease in the energy necessary to form a stable nucleus. From this, we can propose criteria for determining the effect of ultrasonic irradiation on primary Nucleation by showing diagrams correlating Δ G crit with E crit .
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Investigation of primary Nucleation Phenomena of acetylsalicylic acid crystals induced by ultrasonic irradiation—ultrasonic energy needed to activate primary Nucleation
Journal of Crystal Growth, 2006Co-Authors: Etsuko Miyasaka, Satomi Ebihara, Izumi HirasawaAbstract:Abstract The purpose of our study is to clarify ultrasonic primary Nucleation Phenomena for controlling final product size by adjusting the number of primary nuclei. In our previous study, the effect of ultrasonic irradiation on the number of nuclei was investigated under the same supersaturated condition, as a result two novel Phenomena were observed. First, there is a region where ultrasonic irradiation inhibits primary Nucleation. Second, a specific amount of energy is needed to activate primary Nucleation. From this result, it was expected that the ultrasonic energy needed to activate primary Nucleation has a certain relationship to the energy necessary to form a stable nucleus. Therefore, we investigated the following: whether ultrasonic irradiation inhibits and activates primary Nucleation at various degrees of supersaturation, whether final crystal size relates to the number of nuclei, and whether the ultrasonic energy needed to activate primary Nucleation relates to the energy necessary to form a stable nucleus. First, we found that ultrasonic irradiation inhibits and activates primary Nucleation at various supersaturated degrees. Second, we found that final crystal size increases or decreases depending on the number of nuclei. Therefore, it was indicated that ultrasonic energy could yield the desired crystal size by inducing suitable Nucleation. Third, we found that the ultrasonic energy needed to activate primary Nucleation decreases with a decrease in the energy necessary to form a stable nucleus. From this, we can propose criteria for determining the effect of ultrasonic irradiation on primary Nucleation by showing diagrams correlating Δ G crit with E crit .
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Effect of ultrasonic irradiation on Nucleation Phenomena in a Na2HPO4.12H2O melt being used as a heat storage material.
Ultrasonics sonochemistry, 2005Co-Authors: Etsuko Miyasaka, Masakazu Takai, Hideto Hidaka, Yoshihide Kakimoto, Izumi HirasawaAbstract:Abstract The effect of ultrasound on Nucleation Phenomena in the heat storage material Na2HPO4 · 12H2O was investigated by determining the primary Nucleation probability and induction time, and by looking at heat generation Phenomena in the initial stage of Nucleation. The experimental results show that the primary Nucleation probability dramatically increased, and the induction time decreased under the ultrasound irradiation, and in addition, the rate of temperature rise was dependent upon the ultrasonic output. Based on these results and the theoretical relationship between the number of primary nuclei and the heat generation rate, it is proposed that the number of primary nuclei depends upon the ultrasonic output.
M. B. Robinson - One of the best experts on this subject based on the ideXlab platform.
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A statistical approach to understanding Nucleation Phenomena
Materials Science and Engineering: A, 1994Co-Authors: C.w. Morton, William H. Hofmeister, R. J. Bayuzick, M. B. RobinsonAbstract:Abstract A series of undercooling experiments using pure metal samples of niobium and zirconium were performed using the Marshall Space Flight Center 105 meter drop tube, and for zirconium using both electromagnetic and electrostatic levitation in the laboratory. The results from a large number of experiments allowed Nucleation frequencies to be measured, following the suggestion of Skripov. Using the Nucleation frequencies, the Nucleation probability distributions and the cumulative distributions, the critical free energy of Nucleation and the magnitude of the pre-exponential in the classical Nucleation equation were determined. The results for the pre-exponential and critical free energy for zirconium ranged from 10 8 to 10 13 and 15 kT to 24 kT respectively. Higher purity zirconium stock was observed to cause significant shifts in the undercoolings to higher values. For niobium the values were 10 31 and 73 kT for the pre-exponential and the critical free energy, respectively.
Kiwamu Seo - One of the best experts on this subject based on the ideXlab platform.
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effect of ultrasonic irradiation on the crystallization of sodium acetate trihydrate utilized as heat storage material
Chemical Engineering & Technology, 2012Co-Authors: Kiwamu Seo, Shunpei Suzuki, Takuya Kinoshita, Izumi HirasawaAbstract:The effect of ultrasonic irradiation on Nucleation Phenomena in the heat storage material CH3COONa · 3H2O was investigated by measuring the Nucleation probability and induction time. The experimental results show that the concentration of CH3COONa should be operated in the optimum range for CH3COONa · 3H2O-selective crystallization. Furthermore, the Nucleation probability increased and the induction time decreased with increasing energy input. Consequently, the optimum conditions of ultrasonic irradiation of CH3COONa · 3H2O are 53 wt-% CH3COONa, 3.0 W of energy input, and ΔT = 10–68 K.
Joseph P. Cusumano - One of the best experts on this subject based on the ideXlab platform.
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Nucleation Phenomena in an annealed damage model: statistics of times to failure.
Physical review. E Statistical nonlinear and soft matter physics, 2014Co-Authors: Sergey G. Abaimov, Joseph P. CusumanoAbstract:In this paper we investigate the statistical behavior of an annealed continuous damage model. For different model variations we study distributions of times to failure and compare these results with the classical case of metastable Nucleation in statistical physics. We show that our model has a tuning parameter, related to the degree of damage reversibility, that determines the model's behavior. Depending on the value of this parameter, our model exhibits statistical behavior either similar to classical reversible Nucleation Phenomena in statistical physics or to an absolutely different type of behavior intrinsic to systems with damage. This comparison allows us to investigate possible similarities and differences between damage Phenomena and reversible Nucleation.
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Damage Nucleation Phenomena: Statistics of times to failure
arXiv: Statistical Mechanics, 2009Co-Authors: Sergey G. Abaimov, A. Roy, Joseph P. CusumanoAbstract:In this paper we investigate the statistical behavior of an annealed continuous damage model. For different model variations we study distributions of times to failure and compare these results with the classical case of metastable Nucleation in statistical mechanics. We show that our model has a tuning parameter which significantly determines the model behavior. Depending on the values of this tuning parameter, our model exhibits statistical behavior either similar to Nucleation of systems in statistical mechanics or an absolutely different type of behavior intrinsic only for systems with damage. This lets us investigate the possible similarities and differences between damage Phenomena and classical Phenomena of Nucleation in statistical mechanics.
