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HIGH TEMPERATURE STRENGTH OF HYDROGEN ANNEALED SILICON WAFER
Matsushita, J.,Xin, P.,Hayashi, K.,Fujii, O.,Kawamura, N.,Kawakami, T.,Numano, M.,Kubota, H.,Matsushita, Y. 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.1
High temperature strength of hydrogen annealed silicaon wafer was investiaged. Wafers were 150mm in diameter, Czochralski-grown(100) silicon crystal. Silicon wafers were annealed at $1200^{\circ}C$ for 1 hour in a hydrogen atmosphere with a heating rate of $10^{\circ}C/min$ and $20^{\circ}C/min$ in an hot-wall furnace. Oxygen precipitate density in slow heating rate sample and rapid heating rate sample were $2{\times}10^{9}/cm^3$ and $3{\times}10^{7}/cm^3$, respectively. Decreasing the heating rate increases the oxygen precipitate density. The strength was measured by the three-point bending test at $1000^{\circ}C$ using strip-shpaped samples cult from silicon wafer. The maximum resolved shear stress($T_{max}$) at the specimen surface converted from the maximum load was dependent on strain rate and oxygen precipitate density constained in the silicon wafer. The $T_{max}$, 20.5 MPa for as-received samples, was reduced to 17.9MPa in slow heating rate sample. On the other hand, the $T_{max}$ was almost the same as 20.3 MPa in rapid heating rate sample under a strain rate of $6.9{\times}10^{-6}/s$ at $1000^{\circ}C$.
Effect of Liquid Properties on Atomization Characteristics of Liquid Jet across Sheet-Like Air Flow
( T. Yamaguchi ),( T. Okabe ),( M. Shirota ),( T. Inamura ),( M. Daikoku ),( T. Soma ),( Y. Saito ),( Y. Matsushita ),( H. Aoki ),( J. Fukuno ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
A rotary bell-cup atomizer is widely used in the automotive spray painting. The characteristics of this painting is known as high quality finish, high coating efficiency and relatively homogeneous droplet production. The atomizer causes the ligament breakup by the shaping air blowing from the rear of the bell cup. The shaping air carries the generated droplets to the target. In the industrial painting, many paints of different physical properties are used. However, few studies have focused on the effects of physical properties of paint on the atomization characteristics such as the spray angle and the droplet trajectory. The objective of this study is to experimentally clarify the effect of the physical properties of paint on the atomization characteristics. In the experiment, liquid jet (assuming the ligament of paint) was broken up by sheet-like air flow. The experimental conditions such as the air velocity, the liquid density, viscosity and surface tension were varied. The droplet diameter and velocity were quantitatively measured by Particle Tracking Velocimetry (PTV) using double-pulsed Nd: YAG laser with a diffuser as a back light. The breakup point of the liquid jet was measured by image processing method. The experimental results showed that the decrease of surface tension and viscosity produces the finer droplets that are easily carried by the air flow, which results in the increases in the spray angle. This is because the decrease of restoring force and viscous damping due to the decrease of surface tension and liquid viscosity, respectively, promotes the deformation of liquid column, and increases the occurrence frequency of a bag-shaped breakup. We also revealed that the liquid viscosity and surface tension affect droplet trajectory and the range of spray angle.
T. Matsushita,M.J. Goh,M. Kyotani,K. Akagi 한국물리학회 2006 Current Applied Physics Vol.6 No.5
Polyacetylene lms with vertically aligned bril morphology were synthesized in homeotropic nematic LC (N-LC) solvent, byusing a magnetic eld of 5 T as an external perturbation. Next, helical polyacetylene lms with vertically aligned and screwed brilmorphology were synthesized in macroscopically aligned chiral nematic LC (N.-LC) under magnetic eld. Scanning electron micro-graph (SEM) indicated that the lengths of brils from the substrate were 520l m, depending on polymerization time, acetylenepressure and catalyst concentration.
Measurement of Unbound Excited States of ^(24)O
추경호,사토,T. Nakamura,N. Aoi,방형찬,S. CHOI,S. Deguchi,F. Delaunay,J. Gibelin,T. Honda,M. Ishihara,Y. Kawada,Y. Kondo,T. Kobayashi,N. Kobayashi,F. M. Marques,M. Matsushita,Y. Miyashita,T. Motobayashi,Y. Nak 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The unbound excited states of the most neutron-rich oxygen isotope, ^(24)O (Z = 8, N = 16), have been investigated using the ^(24)O(p,p') ^(24)O^* → ^(23)O+n reaction at RIKEN, where a 63 MeV/neuclon secondary beam of ^(24)O was produced in a Be production target by the projectile-like fragmentation of a 95 MeV/u ^(40)Ar primary beam. The first excited 2^* state was observed in the invariant mass spectrum. This experiment will give us a deeper understanding of the new magic number at N=16 in the neutron-rich oxygen isotopes.
Characteristics of second harmonic ECCD on CHS
yasuo Yoshimura,H. Matsushita,H. Igami,K. Nagasaki,K. Matsuoka,K. Ohkubo,K. Nagaoka,M. Isobe,S. Kobayashi,S. Okamura,S. Kubo,S. Nishimura,T. Minami,T. Akiyama,T. Notake,T. Shimozuma,A. Shimizu,C. Suzu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Second harmonic electron cyclotron current drive (ECCD) has been investigated on CHS (Compact Helical System) by using a 2-D steerable EC-beam injection system. The direction of the plasma current, which is the sum of bootstrap current and EC-driven current, is clearly reversed by a reversal of the EC-beam injection direction. The direction of driven current is consistent with expectation in the case of low-field side injection of EC wave. So far, a driven current up to 6 kA has been obtained when bootstrap current is less than 2 kA. It is confirmed that right-hand polarization and low density are effective for ECCD.
Measurement of Unbound Excited States of 24O
Tshoo, K.,Satou, Y.,Nakamura, T.,Aoi, N.,Bhang, H. C.,Choi, S.,Deguchi, S.,Delaunay, F.,Gibelin, J.,Honda, T.,Ishihara, M.,Kawada, Y.,Kondo, Y.,Kobayashi, T.,Kobayashi, N.,Marques, F. M.,Matsushita, M Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2