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Tangential and Vertical Compact Torus Injection Experiments on the STOR-M Tokamak

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Plasma Science and Technology 2005年第2期7卷 2701-2704页

作者：肖持进 S.Livingstone A.K.Singh E.Zhang a.hirose Plasma Physics Laboratory Department of Physics & Engineering Physics University of SaskatchewanSaskatoonSaskatchewan S7N 5E2Canada

This paper describes the setup and results of compact torus (CT) injection experiments on the STOR-M tokamak. Tangential CT injection into STOR-M induced H-mode-like phenomena including doubling the electron density, reduction in the Ha radiation level, suppression of the floating potential fluctuations, suppression of the m = 2 Mirnov oscillations, and increase in the global energy confinement time. Experimental setup, bench-test results, and some preliminary injection data for vertical CT injection experiments on STOR-M will be shown. In addition, numerical simulations of the CT trajectories in tokamak discharges for both tangential and vertical injection geometries will be discussed.

关键词： compact torus tokamak H-mode

The thermal conductivity of the Earth's core and implications for its thermal and compositional evolution

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National Science Review 2021年第4期8卷 18-20页

作者： Kenji Ohta Kei hirose Department of Earth and Planetary Sciences Tokyo Institute of Technology Earth-Life Science Institute Tokyo Institute of Technology Department of Earth and Planetary Science The University of Tokyo

The thermal conductivity of iron alloys is a key to understanding the mechanism of convection in the Earth’s liquid core and its thermal history. The Earth’s magnetic field is formed by a dynamo action that requires...

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A novel type of transverse surface wave propagating in a layered structure consisting of a piezoelectric layer attached to an elastic half-space

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Acta Mechanica Sinica 2010年第3期26卷 417-423页

作者： Zhenghua Qian Feng Jin Sohichi hirose Department of Mechanical and Environmental Informatics Tokyo Institute of Technology Tokyo 152-8550 Japan MOE Key Laboratory for Strength and Vibration Xi'an Jiaotong University 710049 Xi'an China

The existence and propagation of transverse surface waves in piezoelectric coupled solids is investigated, in which perfect bonding between a metal/dielectric substrate and a piezoelectric layer of finite-thickness is assumed. Dis- persion equations relating phase velocity to material con- stants for the existence of various modes are obtained in a simple mathematical form for a piezoelectric material of class 6mm. It is discovered and proved by numerical examples in this paper that a novel Bleustein-Gulyaev （B-G） type of transverse surface wave can exist in such piezoelectric cou- pled solid media when the bulk-shear-wave velocity in the substrate is less than that in the piezoelectric layer but greater than the corresponding B-G wave velocity in the same pie- zoelectric material with an electroded surface. Such a wave does not exist in such layered structures in the absence of pie- zoelectricity. The mode shapes for displacement and electric potential in the piezoelectric layer are obtained and discussed theoretically. The study extends the regime of transverse sur- face waves and may lead to potential applications to surface acoustic wave devices.

关键词： Transverse surface wave Piezoelectric coupled solids - Dispersion relationSurface acoustic wave devices

Grain refining in weld metal using short-pulsed laser ablation during CW laser welding of 2024-T3 aluminum alloy

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International Journal of Extreme Manufacturing 2019年第4期1卷 34-41页

作者： Masaki Kasuga Tomokazu Sano Akio hirose Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka University2-1 Yamada-okaSuitaOsaka 565-0871Japan

The 2024 aluminum alloy is used extensively in the aircraft and aerospace industries because of its excellent mechanical ***,the weldability of 2024 aluminum alloy is generally low because it contains a high number of solutes,such as copper(Cu),magnesium(Mg),and manganese(Mn),causing solidification *** high speed welding of 2024 aluminum alloy without the use of filler is achieved,the applicability of 2024 aluminum alloys will *** refining is one of the methods used to prevent solidification cracking in weld metal,although it has never been achieved for high-speed laser welding of 2024 aluminum alloy without ***,we propose a short-pulsed,laser-induced,grain-refining method during continuous wave laser welding without ***-on-plate welding was performed on a 2024-T3 aluminum alloy at a welding speed of 1 m min−1 with a single mode fiber laser at a wavelength of 1070 nm and power of 1 *** in and around the molten pool were irradiated with nanosecond laser pulses at a wavelength of 1064 nm,pulse width of 10 ns,and pulse energy of 430 *** grain-refinement effect was confirmed when laser pulses were irradiated on the molten *** grain-refinement region was formed in a semicircular shape along the solid–liquid *** of the vertical section indicate that the grain-refinement region reached a depth of 1 mm along the solid–liquid *** Vickers hardness test results demonstrated that the hardness increased as a result of grain refinement and that the progress of solidification cracking was suppressed in the grain refinement region.

关键词： 2024 aluminum alloy hot cracking laser welding grain refinement dendrite fragmentation short pulsed laser laser ablation

Nature of complex number and complex-valued neural networks

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Frontiers of Electrical and Electronic Engineering in China 2011年第1期6卷 171-180页

作者： Akira.hirose Department of Electrical Engineering and Information Systems The University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

We discuss the nature of complex number and its effect on complex-valued neural networks(CVNNs).After we review some examples of CVNN applications,we look back at the mathematical history to elucidate the features of complex number,in particular to confirm the importance of the phaseand-amplitude viewpoint for designing and constructing CVNNs to enhance the *** viewpoint is essential in general to deal with waves such as electromagnetic wave and ***,we point out that,although we represent a complex number as an ordered pair of real numbers for example,we can reduce ineffective degree of freedom in learning or self-organization in CVNNs to achieve better generalization *** merit is significantly useful not only for waverelated signal processing but also for general processing with frequency-domain treatment through Fourier transform.

关键词： electromagnetic wave lightwave coherence adaptive processing in sensing and imaging learning logic neural hardware

Effect of Microstructure of Cementite on Interphase Stress State in Carbon Steel

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Journal of Iron and Steel Research International 2007年第4期14卷 31-38页

作者： CHE Lei GOTOH Masahide HORIMOTO Yoshiaki hirose Yukio Graduate School Kanazawa University Kanazawa 920-1192 Japan Department of Materials Science and Engineering Kanazawa University Kanazawa 920-1192 Japan

The experiments related to stress states of ferrite and cementite in carbon steels were carried out including in situ four-point bending and tensile test by X-ray diffraction technique. Stresses in the cementite phase can be measured by conventional X-ray diffraction instrument after a specific treatment on the specimen surface. In order to estimate the stress states in two phases, the X-ray elastic constants of two phases in single-phase state （PXEC） are determined by the experimental X-ray elastic constants of them in composite state （CXEC）. The effects of volume fraction and particle size of spheroidal cementite on the interphase stress state are estimated. The experimental results are in good agreement with the theoretical relationships reported in the previous studies.

关键词： multi-phase material surface treatment plastic deformation residual stress X-ray diffraction

Small sphincterotomy combined with papillary dilation with large balloon permits retrieval of large stones without mechanical lithotripsy

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World Journal of Gastroenterology 2007年第15期13卷 2179-2182页

作者： Atsushi Minami Shinji hirose Tomohiro Nomoto Shoichiro Hayakawa Internal Medicine Kawasaki Kyodo Hospital 2-1-5 Sakuramoto Kawasaki City 210-0833Japan

AIM： TO introduce a new method： small endoscopic sphincterotomy （ES） combined with endoscopic papillary large balloon dilation （SES ＋ EPLBD） to treat patients with large biliary stones.METHODS： Retrieval of large biliary stones was performed in 88 patients. Mean stone size was 14 ± 3 mm and mean number of stones was 2.5 ± 3.5. Firstly, ES with a small incision was performed. Next, endoscopic papillary dilation was performed with a large balloon to slowly match the size of the bile duct. Stones were then retrieved from the biliary duct with a balloon and a basket.RESULTS： Stone retrieval was successful in all cases except one cystic duct stone case without the need to crush large stones. Mean procedure time was 30 ± 5 min. Dilating the papillary orifice with a large balloon made it possible to remove large stones smoothly without crushing them. After dilation with the large balloon, there were some instances of oozing, but no perforations. One instance of post-procedural pancreatitis （1%） occurred. CONCLUSION： SES ＋ EPLBD was effective for the retrieval of large biliary stones without the use of mechanical lithotripsy.

关键词： Endoscopic sphincterotomy Endoscopic papillary dilation Bile duct stone

Bicuspidization Using the Open-Sleeve Technique for Congenital Aortic Stenosis during Infancy

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Congenital Heart Disease 2024年第2期19卷 177-183页

作者： Toshi Maeda Hiroki Ito Keiichi hirose Kisaburo Sakamoto Departments of Cardiovascular Surgery Mt.Fuji Shizuoka Children’s HospitalShizuoka420-8660Japan

Congenital aortic stenosis(cAS)frequently requires intervention during the neonatal or infantile ***,surgical repair is challenging because of the narrow surgical *** performed bicuspidization using the open-sleeve technique for cAS with a unicuspid aortic valve in two ***,the patients were doing well without reintervention for the aortic valve for 8 and 6 years,*** aortic annular diameter increased along with somatic *** for neonates or infancy can be performed safely using the open-sleeve technique as its midterm results have been satisfactory.

关键词： Aortic valve repair infant bicuspidization open-sleeve technique

Effects of reductive annealing on insulating polycrystalline thin films of Nb-doped anatase TiO2:recovery of high conductivity

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Journal of Semiconductors 2016年第2期37卷 10-13页

作者： Shoichiro Nakao Yasushi hirose Tetsuya Hasegawa Kanagawa Academy of Science and Technology(KAST) Kawasaki 213-0012Japan Japan Science and Technology Agency CRESTBunkyoTokyo 113-0033Japan Department of Chemistry The University of TokyoBunkyoTokyo 113-0033Japan

We studied the effects of reductive annealing on insulating polycrystalline thin films of anatase Nb- doped TiO2 （TNO）. The insulating TNO films were intentionally fabricated by annealing conductive TNO films in oxygen ambient at 400 ℃. Reduced free carrier absorption in the insulating TNO films indicated carrier com- pensation due to excess oxygen. With H2-annealing, both carrier density and Hall mobility recovered to the level of conducting TNO, demonstrating that the excess oxygen can be efficiently removed by the annealing process without introducing additional scattering centers.

关键词： transparent conductive oxide Nb-doped TiOa pulsed laser deposition