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Extension of the operational regime of the LHD towards a deuterium experiment
Takeiri, Y.,Morisaki, T.,Osakabe, M.,Yokoyama, M.,Sakakibara, S.,Takahashi, H.,Nakamura, Y.,Oishi, T.,Motojima, G.,Murakami, S.,Ito, K.,Ejiri, A.,Imagawa, S.,Inagaki, S.,Isobe, M.,Kubo, S.,Masamune, S IOP 2017 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.57 No.10
<P>As the finalization of a hydrogen experiment towards the deuterium phase, the exploration of the best performance of hydrogen plasma was intensively performed in the large helical device. High ion and electron temperatures, <I>T</I> <SUB>i</SUB> and <I>T</I> <SUB>e</SUB>, of more than 6 keV were simultaneously achieved by superimposing high-power electron cyclotron resonance heating onneutral beam injection (NBI) heated plasma. Although flattening of the ion temperature profile in the core region was observed during the discharges, one could avoid degradation by increasing the electron density. Another key parameter to present plasma performance is an averaged beta value <img ALIGN='MIDDLE' ALT='$\left\langle \beta \right\rangle $ ' SRC='http://ej.iop.org/images/0029-5515/57/10/102023/nfaa7fc2ieqn001.gif'/>. The high <img ALIGN='MIDDLE' ALT='$\left\langle \beta \right\rangle $ ' SRC='http://ej.iop.org/images/0029-5515/57/10/102023/nfaa7fc2ieqn002.gif'/> regime around 4% was extended to an order of magnitude lower than the earlier collisional regime. Impurity behaviour in hydrogen discharges with NBI heating was also classified with a wide range of edge plasma parameters. The existence of a no impurity accumulation regime, where the high performance plasma is maintained with high power heating >10 MW, was identified. Wide parameter scan experiments suggest that the toroidal rotation and the turbulence are the candidates for expelling impurities from the core region.</P>
Atmospheric Polycyclic and Nitropolycyclic Aromatic Hydrocarbons in an Iron-manufacturing City
Hayakawa, Kazuichi,Tang, Ning,Morisaki, Hiroshi,Toriba, Akira,Akutagawa, Tomoko,Sakai, Shigekatsu Korean Society for Atmospheric Environment 2016 Asian Journal of Atmospheric Environment (AJAE) Vol.10 No.2
Total suspended particulates (TSP) in the atmosphere were collected for 2 weeks during winter in Muroran, Hokkaido, Japan, a typical iron-manufacturing city. The concentrations of polycyclic aromatic hydrocarbons (PAHs) and nitropolycyclic aromatic hydrocarbons (NPAHs) in TSP were determined by high-performance liquid chromatography (HPLC) using fluorescence and chemiluminescence detectors, respectively. No relationship was observed between the atmospheric PAH and NPAH concentration, or the atmospheric PAH and TSP concentration. However, there was a tendency that the atmospheric PAH concentration was higher when the wind blew from the coke-oven plant. Furthermore, the concentration ratios of 1-nitropyrene to pyrene, which is a suitable indicator of the contribution made by automobiles and coal combustion systems to urban air particulates, were smaller in Muroran and the values were close to those observed in particulates from coal combustion systems. Therefore, these results show that the PAH and NPAH compositions for Muroran are characteristic of an iron-manufacturing city.
Two Dimensional Measurement of Electron Density in LHD plasmas by Sheet-Shaped Thermal Lithium-Beam
yoshiyuki Takahashi,K. Toi,T. Morisaki 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
In the Large Helical Device (LHD), of which the magnetic surfaces are surrounded by a complicated ergodic magnetic field layer, two dimensional measurement of electron density was carried out by using a thermal lithium beam shaped into a sheet extended along the major radius. The thermal lithium beam having a sheet shape was produced in a simple way, the lithium vapor was passed through three orifices placed in front of an aperture of an oven, and was injected vertically into the LHD plasma. Two dimensional images of LiI emission were obtained by using a CCD camera with an interference filter for the LiI spectral line. A two dimensional profile of electron density near the plasma edge region was successfully derived from the LiI emission image.
이성원,백재승,박현준,Ji Eon Won,Yoji Morisaki,Sebastian Sorsaburu,Lars Viktrup 대한남성과학회 2014 The World Journal of Men's Health Vol.32 No.1
Purpose: This post hoc integrated analysis assessed the efficacy and safety of tadalafil 5 mg once daily in a large Korean population with lower urinary tract symptoms suggestive of benign prostatic hyperplasia (BPH-LUTS). Materials and Methods: Individual Korean participant data were integrated from three 12-week, randomized, double-blind, placebo-controlled studies in Asian men with BPH-LUTS, wherein 177 Korean men received placebo and 177 received tadalafil 5 mg once daily. The primary objective was to compare the change from baseline to week 12 in total International Prostate Symptom Score (IPSS) after treatment with tadalafil versus placebo. Results: A significantly greater improvement (p<0.001) in total IPSS from baseline to week 12 was observed for tadalafil compared to placebo (least squares mean: tadalafil=−5.97; placebo=−3.94 ). Total IPSS at weeks 4 and 12, IPSS voiding and storage subscores at weeks 4, 8, and 12, and IPSS quality of life index at weeks 8 and 12 were also significantly improved (p <0.05) for tadalafil compared to placebo. There was significant improvement (p<0.001) in the patient global Impression of improvement responses and numerical improvement in the clinician global impression of improvement responses with tadalafil compared to placebo. There were no significant treatment differences for peak urine flow rate or postvoid residual volume . Few participants had treatment-emergent adverse events and there were no unexpected safety findings. Conclusions: This integrated analysis of three randomized, placebo-controlled Asian studies confirmed tadalafil 5 mg once daily as an efficacious and well-tolerated treatment for Korean men with BPH-LUTS.
Status and Prospects of OTEC Integrated with Seawater Desalination in Japan
Yasuyuki Ikegami,Sami Mutair,Takafumi Morisaki 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.11
Oceans cover approximately 71% of the total surface area of earth; hence oceans are considered the biggest solar collectors on earth. Most of the heat energy transferred by sunlight is absorbed by the thin layer of the ocean’s water near the surface. Below this layer, however, the temperature declines gradually with depth. Ocean Thermal Energy Conversion (OTEC) is a system that converts the temperature difference between the surface and the deep waters of the ocean into electricity. In addition, OTEC provides a clean source of fresh water by further utilization of the remaining temperature difference between the seawaters discharging from the power generation plant in driving the desalination process. This paper describes the evolution of OTEC and desalination research in Japan.
Atmospheric Polycyclic and Nitropolycyclic Aromatic Hydrocarbons in an Iron-manufacturing City
Kazuichi Hayakawa,Ning Tang,Hiroshi Morisaki,Akira Toriba,Tomoko Akutagawa,Shigekatsu Sakai 한국대기환경학회 2016 Asian Journal of Atmospheric Environment (AJAE) Vol.10 No.2
Total suspended particulates (TSP) in the atmosphere were collected for 2 weeks during winter in Muroran, Hokkaido, Japan, a typical iron-manufacturing city. The concentrations of polycyclic aromatic hydrocarbons (PAHs) and nitropolycyclic aromatic hydrocarbons (NPAHs) in TSP were determined by high-performance liquid chromatography (HPLC) using fluorescence and chemiluminescence detectors, respectively. No relationship was observed between the atmospheric PAH and NPAH concentration, or the atmospheric PAH and TSP concentration. However, there was a tendency that the atmospheric PAH concentration was higher when the wind blew from the coke-oven plant. Furthermore, the concentration ratios of 1-nitropyrene to pyrene, which is a suitable indicator of the contribution made by automobiles and coal combustion systems to urban air particulates, were smaller in Muroran and the values were close to those observed in particulates from coal combustion systems. Therefore, these results show that the PAH and NPAH compositions for Muroran are characteristic of an iron-manufacturing city.
박병덕(Byung-Duck Park),이케가미 야스유끼(Yasuyuki Ikegami),모리사끼 따카후미(Takafumi Morisaki) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.11
Kalina cycle has the characteristics of the high power generation efficiency, and been actively researched for the power generation system of the low temperature difference. Power generation efficiency of Kalina cycle is higher than that of the organic Rankine cycle in the case of the low temperature heat source. The non-azeotropic mixture of ammonia-water is used as working fluid of Kalina cycle for high power efficiency. In this paper analyzed theoretically the efficiency of the Kalina power generation system in order to determine the availability of the waste heat of an automobile.