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Nishikawa, Harumitsu,Takahara, Yasumitsu,Takagi, Osamu,Tsuneyoshi, Koji,Kato, Katsuyoshi,Ihara, Tadayoshi,Wakai, Kazunori Korean Society for Atmospheric Environment 2008 Asian Journal of Atmospheric Environment (AJAE) Vol.2 No.2
A new-type apparatus decomposing volatile organic compounds (VOCs) using a combination system of an electrical exothermic SiC honeycomb and a catalytic filter was developed. This linear combination system is very useful to the catalytic decomposition of VOCs, because the gas involving VOCs is well heated in the SiC honeycomb and then flows into the catalytic filter. In the proposed apparatus, the outlet gas temperatures of SiC honeycomb maintained at ca. $300^{\circ}C$ after 5 min from the starting of applying electric current, and sufficient for the catalytic degradation of VOC components, i.e. toluene, isopropanol, methyl ethyl ketone and ethyl acetate. The average decomposition rate of total VOCs exhausted from a printing factory was 85% using pt catalyst at SV=19,000 in this system.
NISHIKAWA, SEIKI TOPOLOGY AND GEOMETRY RESEARCH CENTER 1994 Proceedings of the Topology and Geometry Research Vol.5 No.-
These lectures are meant to discuss the existence problem of harmonic maps of surfaces. Starting with the general theory of harmonic maps, we will focus the lectures on existence/nonexistence of harmonic maps between compact/noncompact Riemann surfaces
Function-level module sharing techniques in high-level synthesis
Nishikawa, Hiroki,Shirane, Kenta,Nozaki, Ryohei,Taniguchi, Ittetsu,Tomiyama, Hiroyuki Electronics and Telecommunications Research Instit 2020 ETRI Journal Vol.42 No.4
High-level synthesis (HLS), which automatically synthesizes a register-transfer level (RTL) circuit from a behavioral description written in a high-level programming language such as C/C++, is becoming a more popular technique for improving design productivity. In general, HLS tools often generate a circuit with a larger area than those of hand-designed ones. One reason for this issue is that HLS tools often generate multiple instances of the same module from a function. To eliminate such a redundancy in circuit area in HLS, HLS tools are capable of sharing modules. Function-level module sharing at a behavioral description written in a high-level programming language may promote function reuse to increase effectiveness and reduce circuit area. In this paper, we present two HLS techniques for module sharing at the function level.
Electrical properties of ABS resin reinforced with recycled CFRP
Nishikawa, Takashi,Ogi, Keiji,Tanaka, Toshiro,Okano, Yasutaka,Taketa, Ichiro The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.1
Composite materials consisting of crushed carbon fiber reinforced plastics (CFRP) pieces and acrylonitrile-butadiene-styrene (ABS) resin were prepared by an injection mold method to solve the problem of recycling of CFRP. The electrical properties, such as electrical resistivity, alternating current impedance and electromagnetic interference (EMI) shielding effect, were measured for the composites. The electrical resistivity of the composites showed a percolation type of conduction behavior and no difference between parallel and perpendicular to the injection direction was observed for CFRP content higher than the critical value. Measurement of alternating current impedance revealed that the conduction mechanism is attributed to the direct conductive paths generated by distributed carbon fibers; however, strong frequency dependence of the impedance was observed for the CFRP content near the critical one. The frequency dependence of the impedance is caused by the inter-fiber connection and can be expressed as a simple equivalent circuit. The absorption component of shielding effect (SE) was smaller than the expected value estimated from its resistivity. The decline of SE is thought to be caused by the decrease in effective thickness due to fiber orientation.
Nishikawa, M.,Okabe, T.,Takeda, N. The Korean Society for Composite Materials 2009 Advanced composite materials Vol.18 No.1
This paper investigated the damage transition mechanism between the fiber-breaking mode and the fiber-avoiding crack mode when the fiber-length is reduced in the unidirectional discontinuous carbon fiber-reinforced-plastics (CFRP) composites. The critical fiber-length for the transition is a key parameter for the manufacturing of flexible and high-strength CFRP composites with thermoset resin, because below this limit, we cannot take full advantage of the superior strength properties of fibers. For this discussion, we presented a numerical model for the microscopic damage and fracture of unidirectional discontinuous fiber-reinforced plastics. The model addressed the microscopic damage generated in these composites; the matrix crack with continuum damage mechanics model and the fiber breakage with the Weibull model for fiber strengths. With this numerical model, the damage transition behavior was discussed when the fiber length was varied. The comparison revealed that the length of discontinuous fibers in composites influences the formation and growth of the cluster of fiber-end damage, which causes the damage mode transition. Since the composite strength is significantly reduced below the critical fiber-length for the transition to fiber-avoiding crack mode, we should understand the damage mode transition appropriately with the analysis on the cluster growth of fiber-end damage.
Lattice-Reduction based Multiuser Detection for Asynchronus MC-CDMA Systems
Masato Nishikawa,Umut Yunus,Hai Lin,Katsumi Yamashita 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-
In uplink of asynchronous multicarrier code division multiple access (MC-CDMA) systems, different. timing offset of individual users result in significant performance degradation. To ease the synchronization in the uplink of asynchronous MC-CDMA, zero-padding (ZP) has been proposed to replace the conventional cyclic prefix, where the signals arc recovered by linear detector. Recently, lattice-reduction (LR) based detection has been proposed to replace the zero-forcing or minimum mean square error criterion based detector. In this paper, lattice-Reduction(LR) is used in asynchronous MC-CDMA to obtain low-complexity linear detection with near optimum performance.
Neutrino oscillation Experiment at J-PARC
Koichiro Nishikawa 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2
A plan of the next-generation long-baseline neutrino experiment is described. The experiment will use the high intensity neutrino beam from the JPARC (Japan Proton Accelerator Research Complex) 50 GeV proton synchrotron and Super-Kamiokande. A sensitive search for ! e and a precision measurement of 23 will be the main objectives of the rst stage of the experiment. An order-of-magnitude improvement through the experiments, which will start in a few years, is expected. With success in observing ! e in the rst stage, CP violation in the lepton sector can be investigated with a 1 Mt water Cherenkov detector (Hyper-Kamiokande) and upgraded PS in the second stage of the experiment.