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Effects of Plastic Strain and Strain Path on Young's Modulus of Sheet Metals
Yamaguchi, K .,Adachi, H .,Takakura, N . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
The effects of plastic strain and strain path on Young's modules of sheet metals are experimentally investigated using low carbon steel, stainless steel, aluminium, copper and brass sheets of 1 mm thickness. These sheets are firstly deformed to different plastic strains under a few strain paths from balanced biaxial stretching to uniaxial tension. Then, a small uniaxial tension test specimen is cut from each deformed sheet and Young's modules is measured using electrical-resistance strain gauges glued to both surfaces of the specimen. The experimental results show that Young's moduli of the low carbon steel and stainless steel sheets decrease with increasing plastic strain, while those of aluminium, copper and brass sheets hardly change with the plastic strain. In all materials, however, the effect of the strain path on Young's modules is not necessarily evident. It is confirmed that Young's modules of the low carbon steel sheet can be recovered to the initial value of undeformed sheet by a subsequent annealing. In addition to Young s modules, the effects of the plastic strain and the strain paths on Poisson's ratio of these materials are also shown.
Experimental investigation of a linear-chain structure in the nucleus <sup>14</sup>C
Yamaguchi, H.,Kahl, D.,Hayakawa, S.,Sakaguchi, Y.,Abe, K.,Nakao, T.,Suhara, T.,Iwasa, N.,Kim, A.,Kim, D.H.,Cha, S.M.,Kwag, M.S.,Lee, J.H.,Lee, E.J.,Chae, K.Y.,Wakabayashi, Y.,Imai, N.,Kitamura, N.,Lee North-Holland Pub. Co 2017 Physics letters. Section B Vol.766 No.-
It is a well-known fact that a cluster of nucleons can be formed in the interior of an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting of atoms. Chemical molecules having a linear alignment are commonly seen in nature, such as carbon dioxide. A similar linear alignment of the nuclear clusters, referred to as linear-chain cluster state (LCCS), has been studied since the 1950s, however, up to now there is no clear experimental evidence demonstrating the existence of such a state. Recently, it was proposed that an excess of neutrons may offer just such a stabilizing mechanism, revitalizing interest in the nuclear LCCS, specifically with predictions for their emergence in neutron-rich carbon isotopes. Here we present the experimental observation of α-cluster states in the radioactive <SUP>14</SUP>C nucleus. Using the Be10+α resonant scattering method with a radioactive beam, we observed a series of levels which completely agree with theoretically predicted levels having an explicit linear-chain cluster configuration. We regard this as the first strong indication of the linear-chain clustered nucleus.
Research on Optimization Design of High Efficient Low Noise SiC-MOSFETs Inverters
K. Yamaguchi,K. Katsura 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents an optimized design example of high efficient inverter which consists of Silicon- Carbide (SiC) Metal-Oxide-Semiconductor-Field-Effect- Transistor (MOSFET) and optimized gate driver for SiCMOSFETs. The purpose of this research is to optimize design of SiC-MOSFETs inverters. We confirmed that the proposed inverter is capable of operating efficiently with experimental results. The proposed gate driver can reduce switching losses and switching time without increasing surge and ringing voltage. We also analyzed effects of removing Schottky-Barrier-Diode (SBD) from SiC-MOSFETs power modules. Removing SBDs gives some positive effects that can not only reduce cost and size of inverters, but also can reduce switching surge and ringing voltage. SiC-MOSFETs without SBDs have bigger damping coefficient and smaller junction capacitance than SiC-MOSFETs with SBDs. The bigger damping coefficient can reduce ringing voltage. The smaller junction capacitance can reduce switching losses and noise.
Study on α-cluster levels in non-4n nuclei using low-energy RI beams
Yamaguchi, H,Kahl, D,Hayakawa, S,Sakaguchi, Y,Abe, K,Nakao, T,Suhara, T,Iwasa, N,Kim, A,Kim, D H,Cha, S M,Kwag, M S,Lee, J H,Lee, E J,Chae, K Y,Wakabayashi, Y,Imai, N,Kitamura, N,Lee, P,Moon, J Y,Lee, IOP Publishing 2017 Journal of physics. Conference series Vol.863 No.-
Yuusuke YAMAGUCHI,A. Fukuyama,H. Nakajima,H. Higaki,K. Nakagome,K. Nemoto,M. Katano,M. Ichimura,S. Kakimoto,T. Cho 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A wide-band radio-frequency (RF) probe system was newly constructed for the active diagnostic of the eigenmode formations in the ion-cyclotron range of frequencies in the GAMMA 10 tandem mirror. A bar-type antenna was installed in the peripheral region in the minimum-B anchor cell. A low-power RF pulse with the frequency sweep from 8 to 20 MHz is applied to the antenna. The waves excited in the plasma are detected with a magnetic probe. The excitation of eigenmodes is described by using the antenna-plasma-probe transfer function. The transfer function can be obtained from the antenna current signal and the magnetic probe signal. When the real and the imaginary part of the transfer function are plotted in the complex plane, the resultant curves are approximately circles, indicating an eigenmode formation. It is found that the several fast wave eigenmodes can be excited in the present experimental condition.