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Thermodynamic and Transport Properties of Ru2−xFexCrSi (1.3 ≤ x ≤ 1.8)
Masakazu Ito,Toru Hisamatsu,Tsugumi Rokkaku,Osamu Murayama,Iduru Shigeta,Masahiko Hiroi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have measured the temperature (T) dependences of the electric resistivity, ρ(T), and thespecific heat, Cp(T), of the ferromagnetic full-Heusler compound Ru2−xFexCrSi (1.3 ≤ x ≤ 1.8). ρ(T) shows a metallic behavior (@ρ/@T > 0) for 20 . T ≤ 300 K and nominal upturn at around20 K for all samples. In the low-temperature range, Cp(T) can be described by Debye’s T3 law. Although the coefficient of the lattice part of Cp(T), β, is insensitive for the Fe concentration x,the electronic specific heat part, , decreases with increasing x. The values of the total densities ofstates (Dtotal(EF )) estimated fromwere 12.8, 10.1, and 9.6 states/f.u. eV for x = 1.3, 1.6, and1.8, respectively. The values of majority spin band (D"(EF )) and the minority spin band (D#(EF ))were also estimated usingand the spin polarization P defined by Andreev-reflection experiments.
Life-cycle analyses of very-large scale PV systems using six types of PV modules
Masakazu Ito,Keiichi Komoto,Kosuke Kurokawa 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The authors have been studied the life-cycle analysis of the VLS-PV systems installed in desert area using sc-Si, mc-Si, a-Si/sc-Si, a-Si/lc-Si, CdTe, and CIS PV modules. The sc-Si and a-Si/sc-Si, a-Si/lc-Si are new items from the last studies [1]. It is assumed 1 GW system in Gobi desert including transmission lines. We estimated energy requirement, energy pay-back time, CO2 emissions, and CO2 emissions rate. Concerning the energy requirement, the CIS is the smallest, and biggest energy requirement is the sc-Si. The mc-Si, a-Si/sc-Si, thin-film Si and CdTe are average. The energy pay-back time of the CIS’s VLS-PV system is approximately 1.8 years, and sc-Si is 2.5 years. The others are approximately 2.0–2.3 years. Characteristics of the CO2 emissions rate are almost same as energy pay-back time. The CO2 emissions rate is 43–54 g-CO2/kW h. The mc-Si, a-Si/sc-Si, and CIS shows lower CO2 emissions rate.
CASE REPORT : Four Cases of Successfully Treated Chronic Expanding Soft Tissue Hematoma
( Takamichi Ito ),( Takeshi Nakahara ),( Satoshi Takeuchi ),( Hiroshi Uchi ),( Masakazu Takahara ),( Yoichi Moroi ),( Masutaka Furue ) 대한피부과학회 2014 Annals of Dermatology Vol.26 No.1
Chronic expanding hematoma (CEH) is a rare, slow- developing disease that occurs months to years after trauma or surgery. Most CEH in soft tissue occurs in the thigh or upper extremities and can occur with or without an inducible cause. Ninety-one cases of CEH in soft tissue have been reported previously in the Japanese and English literature but its occurrence on the sole has not been reported. Here, we report four cases of successfully treated CEH, including a case occurring on the sole, and provide a review of the literature. (Ann Dermatol 26(1) 107∼110, 2014)
( Taku Kobayashi ),( Hiroaki Ito ),( Toshifumi Ashida ),( Tadashi Yokoyama ),( Masakazu Nagahori ),( Tomoki Inaba ),( Mitsuhiro Shikamura ),( Takayoshi Yamaguchi ),( Tetsuharu Hori ),( Philippe Pinton 대한장연구학회 2021 Intestinal Research Vol.19 No.4
Background/Aims: A subgroup analysis was conducted in Japanese patients with moderate to severe ulcerative colitis (UC) enrolled in the phase 3 VISIBLE 1 study, which evaluated the safety and efficacy of a new vedolizumab subcutaneous (SC) for-mulation. Methods: Eligible patients received open-label infusions of vedolizumab 300 mg intravenous (IV) at weeks 0 and 2 in the induction phase. Patients with clinical response by complete Mayo score at week 6 entered the double-blind maintenance phase and were randomized to vedolizumab 108 mg SC every 2 weeks, placebo, or vedolizumab 300 mg IV every 8 weeks. The primary endpoint was clinical remission (complete Mayo score ≤2 points; no individual subscore >1 point) at week 52. Results: Of 49 patients who entered the induction phase, 22 out of 49 patients (45%) had clinical response at week 6 and were randomized to vedolizumab 108 mg SC (n=10), placebo (n=10), or vedolizumab 300 mg IV (n=2). At week 52, 4 out of 10 pa-tients (40%) who received vedolizumab SC had clinical remission versus 2 out of 10 patients (20%) who received placebo (dif-ference: 20% [95% confidence interval, ±27.9 to 61.8]). Two patients (2/10, 20%) who received vedolizumab SC experienced an injection-site reaction versus none who received placebo. Conclusions: Our results indicate that the efficacy of vedolizumab SC in a subgroup of Japanese patients with UC are similar with those in the overall VISIBLE 1 study population, and with those established with vedolizumab IV. The safety and tolerability of vedolizumab SC were generally similar to that established for vedolizumab IV. (ClinicalTrials.gov ID NCT02611830; EudraCT 2015-000480-14) (Intest Res 2021;19:448-460)
Antiferromagnetic Transition in Ru2CrSi in Magnetic Fields
Masahiko Hiroi,Kaori Uchida,Iduru Shigeta,Masakazu Ito,Keiichi Koyama,Shojiro Kimura,Kazuo Watanabe 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
In the Heusler compound Ru2CrSi, an antiferromagnetic transition at TN =14 K was revealed byspecific heat and magnetization measurements. In this study the electrical resistivity is measured inmagnetic fields up to 14.5 T, and the antiferromagnetic transition in magnetic fields is investigated. In the temperature dependence of the resistivity at zero field, a clear dip at 15 K and a humpwith a maximum at 9 K are observed. This dip is considered to be due to the antiferromagnetictransition. With increasing magnetic field, the magnitude of the resistivity slightly increases aroundTN; i.e., a positive magnetoresistance is observed. The temperature dependence of the resistivityis hardly affected by increasing the magnetic field. The transition temperature decreases only by 0.3 K even with applying 14.5 T. These results demonstrate that the antiferromagnetic state inRu2CrSi is unusually unaffected by a strong magnetic field.
Magnetic Properties of Mn2Sb1−xGex (0.05 ≤ x ≤ 0.2) in High Magnetic Fields
Daisuke Shimada,Hiroki Orihashi,Daisuke Mitsunaga,Masakazu Ito,Masahiko Hiroi,Keiichi Koyama,Reisho Onodera,Kohki Takahashi,Kazuyuki Matsubayashi,Yoshiya Uwatoko 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Magnetization and electrical resistivity measurements were carried out for polycrystallineMn2Sb1−xGex (0.05 ≤ x ≤ 0.2) in magnetic fields up to 16 T in the 4.2 - 600 K temperaturerange in order to investigate the magnetic and the electrical properties under high magnetic fields. Mn2Sb0.92Ge0.08 showed a Curie temperature, TC, of 532 K and a first order magnetic transitionfrom a ferrimagnetic (FRI) to an antiferromagnetic (AFM) phase at Tt = 230 K with decreasingtemperature in a zero magnetic field. With increasing x, TC decreased and Tt increased. ForMn2Sb0.92Ge0.08, a matamagnetic transition from an AFM to a FRI phase was observed at 215 K. The magnetic phase diagram of Mn2Sb1−xGex is presented.
Miharat Yoshinori,Maruyama Yasuo,Okada Yutaka,Kido Hachiro,Nishida Osami,Fujita Hirotsugu,Ito Masakazu The Korean Society of Marine Engineering 2005 한국마린엔지니어링학회지 Vol.29 No.7
A marine diesel engine should realize optimal operation efficiency while reducing NOx, PM (Particulate Matters) and other emissions. Fuel injection systems that use electronic control can become an effective means of achieving that objective. However. it still needs some accurate and instant information in order to bring its ability into full potential while sailing on the sea. The important information of them are a shaft torque and continuous combustion pressures of all cylinders. The shaft torque and the propeller thrust described in this paper are measured at an intermediate shaft by using a unique principle that one of two electromagnet coils oscillates a vibrating strip which the length changes with force and the other coil picks up the change of the frequency of the vibrating strip. For further reference, the shaft power meter multiplied the torque by the shaft revolution has already had about 750 sets of sales performance. The research presented in this paper started about ten years ago and is concerned with the development of a combustion pressure sensor that uses the same principle. Recently, the pressure sensor which bears continuous operation has been developed after a hard struggle, that is, the system that consists of a shaft horsepower meter, a propeller thrust meter and a combustion pressure sensor has been completed and has been shown to be reliable. This paper describes the configuration of this system, the material of the combustion pressure sensor, the principle of that, and the improving point of the sensor, and, we finally consider the use of this system.