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Temperature and diameter effect on hydrodynamic characteristic of surfactant drag-reducing flows
Indartono Y.S.,Usui H.,Suzuki H.,Komoda Y. The Korean Society of Rheology 2005 Korea-Australia rheology journal Vol.17 No.4
Hydrodynamic characteristic of surfactant drag-reducing flows is still not fully understood. This work investigated the temperature and diameter effect on hydrodynamic characteristic of cationic surfactant drag reducing flows in pipes. Solution of oleyl bishydroxyethyl methyl ammonium chloride (Ethoquad O/12), 900 ppm, as a cationic surfactant and sodium salicylate (NaSal), 540 ppm, as a counter-ion was tested at 12, 25, 40, and $50^{\circ}C$ in pipes with diameter of 13, 25, and 40 mm. Drag reduction effectiveness of this surfactant solution was evaluated in 25 mm pipe from 6 to $75^{\circ}C$. Rheological characteristic of this solution was measured by stress control type rheometer with cone-and-plate geometry. Scale-up laws proposed by previous investigators were used to evaluate the flow characteristic of the solution. It was found that this surfactant solution has clear DR capability until $70^{\circ}C$. Result of this work suggested that temperature has a significant influence in changing the hydrodynamic entrance length of surfactant drag reducing flows. From rheological measurement, it was found that the solution exhibits Shear Induced Structure at all temperatures with different degree of peak viscosity and critical shear rate.
User Interface for Sensitivity Analysis on Qualitative and Quantitative Hybrid Simulation
Masaki Samejima,Goro Shida,Masanori Akiyoshi,Norihisa Komoda 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-
The qualitative and quantitative hybrid simulation system was proposed for support of designing a business scenario. In using the system, a business manager must describe a qualitative and quantitative hybrid model for the simulation, and perform sensitivity analysis to decide appropriate input values. Those are complicated tasks, so that a business manager often spends time. In order to support those tasks, we propose user interfaces that consist of a model description editor and a visualization window of changes in input values and output values for sensitivity analysis. A model description editor makes it easier to describe the hybrid model by interactive editing the model represented as a graph. A visualization window expresses changes in input values as a radar chart and plots averages and variances of changed output values for comparison. As a result of questionnaires concerning the user interface, it is confirmed that our proposed interface is effective for designing a business scenario.
Kumagai, Hozumi,Kusaba, Hitoshi,Okumura, Yuta,Komoda, Masato,Nakano, Michitaka,Tamura, Shingo,Uchida, Mayako,Nagata, Kenichiro,Arita, Shuji,Ariyama, Hiroshi,Takaishi, Shigeo,Akashi, Koichi,Baba, Eishi Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.1
Background: Antiemetic triplet therapy including dexamethasone (DEX) is widely used for patients receiving highly emetogenic chemotherapy (HEC). In Japan, the appropriate dose of DEX has not been established for this combination. Materials and Methods: To assess the efficacy and safety of increased-dose DEX, we retrospectively examined patients receiving HEC with antiemetic triplet therapy. Results: Twenty-four patients (fosaprepitant group) were given an increased-dose of DEX (average total dose: 45.8mg), fosaprepitant, and 5-HT3 antagonist. A lower-dose of DEX (33.6mg), oral aprepitant, and 5-HT3 antagonist were administered to the other 48 patients (aprepitant group). The vomiting control rates in the fosaprepitant and aprepitant groups were 100% and 85.4% in the acute phase, and were 75.0% and 64.6% in the delayed phase. The incidences of toxicity were similar comparing the two groups. Conclusions: Triplet therapy using an increased-dose of DEX is suggested to be safe and effective for patients receiving HEC.
Temperature and diameter effect on hydrodynamic characteristic of surfactant drag-reducing flows
Y.S. Indartono,H. Usui,H. Suzuki,Y. Komoda 한국유변학회 2005 Korea-Australia rheology journal Vol.17 No.4
Hydrodynamic characteristic of surfactant drag-reducing flows is still not fully understood. This work investigated the temperature and diameter effect on hydrodynamic characteristic of cationic surfactant drag reducing flows in pipes. Solution of oleyl bishydroxyethyl methyl ammonium chloride (Ethoquad O/12), 900 ppm, as a cationic surfactant and sodium salicylate (NaSal), 540 ppm, as a counter-ion was tested at 12, 25, 40, and 50oC in pipes with diameter of 13, 25, and 40 mm. Drag reduction effectiveness of this surfactant solution was evaluated in 25 mm pipe from 6 to 75oC. Rheological characteristic of this solution was measured by stress control type rheometer with cone-and-plate geometry. Scale-up laws proposed by previous investigators were used to evaluate the flow characteristic of the solution. It was found that this surfactant solution has clear DR capability until 70oC. Result of this work suggested that temperature has a significant influence in changing the hydrodynamic entrance length of surfactant drag reducing flows. From rheological measurement, it was found that the solution exhibits Shear Induced Structure at all temperatures with different degree of peak viscosity and critical shear rate.