Katsuhiko Tsuchiya

National Institutes for Quantum and Radiological Science and Technology

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K. Kizu

National Institutes for Quantum and Radiological Science and Technology

Haruyuki Murakami

National Institutes for Quantum and Radiological Science and Technology

K. Yoshida

Fukuoka Institute of Health and Environmental Sciences

M. Matsukawa

Nagasaki University

Fumihiko Miyake

St. Marianna University School of Medicine

H. Tamai

University of Tsukuba

Haruki Musha

St. Marianna University School of Medicine

S. Ishida

Chukyo Hospital

Nobuyuki Hashimoto

Osaka Medical Center for Cancer and Cardiovascular Diseases

T. Ando

Keiai University

Cooperative Institutions

Japan Atomic Energy Agency

147

National Institutes for Quantum and Radiological Science and Technology

105

Advanced Science Research Center

University of Tsukuba

National Institute for Fusion Science

Kyoto University

Tohoku University

The University of Tokyo

St. Marianna University School of Medicine

Osaka University

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Monitoring and control of the magnet system of JT-60SA

Fusion Engineering and Design (2019)

Kazuma Fukui K. Kamiy Kyohei Natsume K. Kawano T. Isono

Interlock

Shields

10.1016/j.fusengdes.2018.12.080

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Citations (3)

慢性期間中のアディポネクチン血しょう中濃度は,経皮的冠状動脈介入術(PCI)における再狭窄の予測因子である

Circulation (2003)

Tomoyuki Kunishima M Sakakibara T Mikami Hideshi Aoyagi Ken Kongoji

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Citations (0)

Development of<tex>$hboxNb_3hboxSn$</tex>Cable-in-Conduit Conductors With Stainless Steel Jackets for Central Solenoid of JT-60SC

IEEE Transactions on Applied Superconductivity (2004)

Yushi Miura K. Kizu Katsuhiko Tsuchiya T. Isono N. Koizumi

Development of Nb/sub 3/Sn cable-in-conduit (CIC) conductors with stainless steel (SS) jackets for the central solenoid (CS) and divertor coil of the superconducting tokamak called JT-60SC, is presented. Full-size and subsize conductors were manufactured using two types of high-copper-ratio and high-J/sub c/ strands made by different processes (bronze and internal-tin). Use of a SS jacket causes decrease of critical current of the conductor because compression strain due to difference of the thermal contraction between the SS jacket and Nb/sub 3/Sn cable is generated. The strains are estimated from the results of critical current measurements using short full-size samples which were pool-cooled. In order to investigate J/sub c/-B-T characteristics of a CIC conductor, a novel apparatus, which can control the temperature and magnetic field, has been developed. This apparatus makes it possible to measure directly the critical current and temperature of a subsize conductor, which is composed of two superconducting strands, one copper wire and a SS jacket. Strains of the subsize conductors are estimated from the results of the J/sub c/-B-T characteristic measurements. By comparison of the estimated strains between the full-size and subsize samples, we concluded that the characteristics of the full-size conductor can be predicted by measuring of J/sub c/-B-T characteristics of subsize conductors. Finally, the strain of the actual conductor under the operational condition is estimated. The result confirms that the developed conductors are applicable to CS and divertor coil of JT-60SC.

Solenoid

Niobium-tin

Electrical conduit

10.1109/tasc.2004.830689

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Citations (1)

Acidic fibroblast growth factor activates adrenomedullary secretion and sympathetic outflow in rats

AJP Regulatory Integrative and Comparative Physiology (1998)

Itsuro Matsumoto Akira Niijima Yutaka Oomura Kazuo Sasaki Katsuhiko Tsuchiya

Effects of exogenous acidic fibroblast growth factor (aFGF), which is increased in the brain by food intake, on the plasma levels of catecholamines and on sympathetic efferent outflow were examined in anesthetized rats. A guide cannula was inserted into the cerebral third ventricle, and a vascular indwelling catheter was inserted into the right atrium from the jugular vein. Plasma epinephrine (Epi) and norepinephrine (NE) increased markedly in a dose-dependent manner for up to 120 min after intracerebroventricular or intravenous administration of aFGF (6-667 fmol/rat). Concomitant increases occurred in the efferent activity in the sympathetic nerves supplying the adrenal, spleen, and interscapular brown adipose tissue after the above administrations of aFGF. Both intravenous and intracerebroventricular administration of 10 ng basic FGF (bFGF) also increased sympathetic adrenal efferent activity and plasma Epi and NE concentrations. However, the increases induced by 10 ng bFGF were smaller than those induced by 10 ng aFGF. Bilateral splanchnicotomy completely prevented the increases in Epi induced by intracerebroventricular or intravenous aFGF but had less effect on the increases in NE. Pretreatment with an antibody against corticotropin-releasing factor (CRF), given via the intracerebroventricular route, significantly attenuated the increases in Epi and NE evoked by intracerebroventricular or intravenous administration of aFGF. Hepatic vagotomy also greatly reduced the increases in both catecholamines and the increases in sympathetic efferent firing rates evoked by intravenous administration of aFGF. These findings indicate that 1) aFGF administered intracerebroventricularly activates adrenomedullary secretion and sympathetic outflow via CRF release and 2) aFGF injected intravenously also induces sympathoadrenomedullary activation via centrally released CRF. The idea is discussed that sympathetic activation induced either by endogenous aFGF after feeding or by exogenously administered aFGF may play roles both in energy expenditure after overeating and in the modulation of immune functions.

Sympathetic nervous system

10.1152/ajpregu.1998.275.4.r1003

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Citations (5)

Emission Control of Two-Stroke Motorcycle Engines by the Butterfly Exhaust Valve

SAE technical papers on CD-ROM/SAE technical paper series (1980)

Katsuhiko Tsuchiya Seiji Hirano Makoto Okamura Tohru Gotoh

This paper discusses the butterfly exhaust valve system installed on the Yamaha RD400 Daytona Special, which is the only two-stroke cycle engine motorcycle in the controlled 400cc class. The paper also refers to the structure of the valve system and the principle of valve operation, as well as its effects on reducing exhaust emissions, improving brake specific fuel consumption, and increasing engine power at part-throttle.

Two-stroke engine

Stroke

Four-stroke engine

10.4271/800973

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Citations (16)

H mode power threshold database for ITER

Nuclear Fusion (1996)

F. Ryter J. Snipes R. Granetz M. Greenwald O. Kardaun

The ITER Threshold Database, which at present comprises data from nine divertor tokamaks, is described. The main results are presented and discussed. The properties and dependences of the power threshold in individual devices are reviewed. In particular, the analysis shows a rather general linear dependence on magnetic field, but a non-monotonic density dependence that varies from device to device. Investigation of the combined database suggests that the threshold dependence P thres approximately=0.3n e B T 2.5 shows reasonable agreement with the data. This expression yields P thres approximately=150 MW at a density of 0.5*10 20 m -3 for ITER. Other expressions with weaker size dependence, and therefore lower threshold power for ITER, are also discussed. Their agreement with the present data is poorer than that of the above expression. In addition, the database is investigated by statistical discriminant analysis. The edge data included at present are described and discussed. Finally, there is a discussion of the implications of the results for ITER

Mode (computer interface)

10.1088/0029-5515/36/9/i11

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Citations (128)

Tail Vasodilation of Spontaneously Hypertensive Rat (SHR) and Stroke-prone SHR (SHR-SP) during Heat Stress

Japanese Heart Journal (1986)

Katsuhiko Tsuchiya Mitsuo Kosaka Masami Niwa Masayori Ozaki

1. In three groups of rats; WKY, SHR and SHR-SP of 10 months old, rectal temperatures in conscious condition were evaluated at onsets of tail vasodilation during heat stress and at constant air temperatures. 2. The tail vasodilation in SHR and SHR-SP were triggered at higher air temperature than in WKY. 3. Rectal temperature of SHR measured both onsets of the tail vasodilation and at constant temperatures were higher than those in WKY and SHR-SP.

Spontaneously hypertensive rat

Rectal temperature

10.1536/ihj.27.599

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Citations (0)

PJ-699 Evaluation of High Frequency Components within QRS Complex of Brugada Syndrome by Using Wavelet Transform Analysis(ECG/Body surface potential mapping/Holter-7 (A) PJ117,Poster Session (Japanese),The 70th Anniversary Annual Scientific Meeting of the Japanese Circulation Society)

Japanese Circulation Journal-english Edition (2006)

Satoru Nishio Masatoshi Hara Katsuhiko Tsuchiya Tomoo Harada Kiyoshi Nakazawa

Body surface

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Effects of propiverine hydrochloride and its metabolites on isolated guinea pig urinary bladder.

Folia Pharmacologica Japonica (1989)

A Haruno Y Yamasaki K Miyoshi H Miyake Katsuhiko Tsuchiya

propiverine hydrochloride(P-4)および P-4 のヒト血中ならびに尿中の活性代謝物である 1-methyl-4-piperidyl diphenylpropoxyacetate N-oxide〔P-4(N→O)〕，1-methyl-4-piperidyl benzilate N-oxide〔DPr-P-4(N→O)〕および 1-methyl-4-piperidyl benzilate hydrochloride〔DPr-P-4〕の摘出モルモット膀胱標本に対する作用について検討した．P-4 は acetylcholine(ACh)用量反応曲線に対し10-6Mおよび10-5Mで右に平行移動を示し，10-5Mではそれに加えて最大収縮抑制作用を示した．P-4 の pA2 値および pD'2 値は，それぞれ6.36，4.52であった．P-4 の N-oxide体であるP-4(N→O)は，10-5M以上より最大収縮抑制作用，すなわち非競合的拮抗作用を示し，その pD'2値は4.06であった．P-4の脱プロピル体である DPr-P-4(N→O)および DPr-P-4 はそれぞれ 10-6 から 10-4Mおよび10-7 から 10-5Mで右に平行移動，すなわち競合的拮抗作用を示し，その pA2 値はそれぞれ5.87，7.06であった．propantheline の pA2 値は，8.26 であった．100mM KCl 単一収縮に対しては，P-4 は10-6M以上より用量依存的な抑制作用を示し，その IC50 値は 1.8×10-5Mであり，その抑制作用の強さは terodiline(IC50値:1.1×10-5M)と同程度であった．一方，P-4(N→O)，DPr-P-4 および DPr-P-4(N→O)の抑制作用は P-4 に比して弱く，IC50 値はそれぞれ >10-4M，1.3×10-4M，>10-4Mであった．Ca拮抗剤の verapamil の IC50 値は 1.9×10-6Mであった．P-4およびP-4(N→O)はCaの取り込み抑制作用を示した．以上の結果より，P-4は主としてCa拮抗作用を介する平滑筋直接作用を有し，P-4 の代謝物である P-4(N→O)は P-4 と同様にCa拮抗作用を介する平滑筋直接作用，DPr-P-4(N→O)および DPr-P-4 は抗コリン作用を有することが推定された．

Hydrochloride

IC50

10.1254/fpj.94.145

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Citations (39)

Design of superconducting coil system for remodeling JT-60

IEEE Transactions on Applied Superconductivity (2002)

T. Ando S. Ishida Takashi Kato M. Kikuchi K. Kizu

At JAERI a plan of remodeling JT-60 tokamak fusion device by using superconducting coil system is being considered to investigate performance of break-even plasma in long pulse operation. The coil system are composed of Toroidal Field (TF), Central Solenoid (CS) and Equilibrium Field (EF) coils. The TF coil is designed to have a maximum field of 7.4 T at winding with a nominal current of 19.4 kA and a magnetic stored energy of 1.7 GJ which is larger than that of every superconducting coil constructed so far. The coil uses a cable-in-conduit conductor that a Nb/sub 3/Al (or Nb/sub 3/Sn) strand cable is inserted into a square stainless steel conduit with a circular hole and is wound with a react-and-wind technique. The design operating temperature is 4.6 K. The CS which consists of 4 modules is operated with a maximum field of 7.4 T and a maximum ramp up rate of 1.0 T/s. For the conductor, a square Nb/sub 3/Sn cable-in-conduit conductor with stainless steel conduit is used. The EF coil consists of 6 coils that the maximum size coil has an outer diameter of 11 in. The EF4 coil which has a maximum field of 7.4 T and a ramp up rate of 2.2 T/s uses the same conductor as CS and other field coils use a NbTi cable-in-conduit conductor.

Solenoid

Niobium-tin

Fusion power

Field coil

10.1109/tasc.2002.1018452

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Citations (13)