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Journal of Materials Science and Chemical Engineering 2021年第10期9卷 1-9页

作者： Sudip Adhikari Rucheng Zhu masayoshi umeno C’s Techno Inc. Co-Operative Research Center for Advanced Technology Nagoya Science Park Nagoya Japan Engineering Department Chubu University Kasugai Japan

Graphene thin films synthesized directly at low temperature (550˚C) on silicon substrate by microwave (MW) surface wave plasma (SWP) chemical vapor deposition (CVD) using the cover on substrates for avoiding plasma emission ultraviolet ray’s effect during film deposition. Analytical methods such as Raman spectroscopy, Transmission electron microscopy (TEM) and Scanning electron microscopy (SEM), four-point probe method, and JASCO V-570 UV/VIS/NIR spectrophotometer were employed to characterize the properties of the graphene films. Here, we report that it is possible to grow graphene directly on the silicon substrate (without using catalyst) due to the high radical density of MW SWP CVD. Furthermore, we fabricated graphene/silicon Schottky junction solar cells with an efficiency of up to 6.39%. Compared to conventional silicon solar cells, the fabrication process is greatly simplified;just graphene is synthesized directly on n-type crystalline Si substrate at low temperate.

关键词： Graphene Direct Synthesis Microwave Plasma CVD Photovoltaics

Catalyst-Free Growth of Graphene by Microwave Surface Wave Plasma Chemical Vapor Deposition at Low Temperature

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Journal of Materials Science and Chemical Engineering 2016年第3期4卷 10-14页

作者： Sudip Adhikari Hare Ram Aryal Hideo Uchida masayoshi umeno Department of Electronics and Information Engineering Chubu University Kasugai Japan

Catalyst-free graphene films has been synthesized by microwave (MW) surface wave plasma (SWP) chemical vapor deposition (CVD) using hydrogenated carbon source on silicon substrates at low temperature (500℃). The synthesized process is simple, low-cost and possible for application on transparent electrodes, gas sensors and thin film resistors. Analytical methods such as Raman spectroscopy, transmission electron microscopy (TEM) and four points prove resistivity measurement and UV-VIS-NIR spectroscopy were employed to characterize properties of the graphene films. The formation of multilayer of graphene on silicon substrate was confirmed by Raman spectroscopy and TEM. It is possible to grow graphene directly on silicon substrate (without using catalyst) due to high radical density of MW SWP CVD. In addition, we also observed that the hydrogen had significant role for quality of graphene.

关键词： Graphene Films Direct Synthesis H2 Flow Rate Silicon Substrate Microwave Surface Wave Plasma CVD

Energy Demand for 21st Century and Present PV Cost Analysis

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Energy Demand for 21st Century and Present PV Cost Analysis

Simple procedure for assessing diffuse subarachnoid hemorrhage successfully created using filament perforation method in mice

第十五届国际光伏科学与工程大会

作者： Dilip C.Ghimire Sudip Adhikari Sunil Adhikary Hideo Uchida masayoshi umeno Department of Electrical and Electronic Engineering Chubu University 1200 Matsumoto-cho Kasugai 487-8501 Japan Department of Electronics and Information Engineering Chubu University 1200 Matsumoto-cho Kasugai 487-8501 Japan

The energy demand of 21 century is significantly high due to the increase of world population and the advancement in science and technology. Most of the energy demand of the world has been fulfilled by fossil fuels and nuclear power. The excessive use of fossil fuels has caused the environmental problems in many countries of the world. The oil crisis of the 1970s coupled with the continual decline of fossil fuels reserves made us aware that alternative sources of renewable energy are necessary in order to ensure the world’s energy needs of the immediate future. Photovoltaic (PV) energy is attractive and reliable among the alternative energy sources, and widespread use of it could fulfill the future energy demand without having environmental problems. As a clean energy technology, PV energy can indeed promote sustainable economic development. Nevertheless, most of the primary energy still depends on fossil fuels and current utilization of renewable energy is negligibly small, except for hydropower. There is a forecast that the world primary energy supply in 2030, will increase to over 1.5 times as much as that in 2000 due to the world economic growth and population increase. In addition, energy demand in developing countries will increase significantly. In addition to the energy crisis problem, the massive consumption of fossils fuels with its resulting CO emissions has caused the problem of global warming. The purpose of our research is to illustrate estimated long-term cost of a PV module and a thermal energy system powered by fossil fuels.

关键词： World energy demand PV energy PV cost

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Animal Models and Experimental Medicine 2024年第1期7卷 77-81页

作者： Tatsushi Mutoh Ryota Tochinai Hiroaki Aono masayoshi Kuwahara Yasuyuki Taki Tatsuya Ishikawa Department of Surgical Neurology Research Institute for Brain and Blood VesselsAkita Cerebrospinal and Cardiovascular CenterAkitaJapan Department of Aging Research and Geriatric Medicine Institute of DevelopmentAging and CancerTohoku UniversitySendaiJapan Department of Veterinary Pathophysiology and Animal Health Graduate School of Agriculture and Life SciencesThe University of TokyoTokyoJapan

The murine model of subarachnoid hemorrhage(SAH)is a valuable experimental tool for investigating molecular and cellular mechanisms,and the endovascular filament perforation technique can be used to simulate prominent pathophysiological features observed after human SAH;however,current validation methods for assessing an appropriate SAH model are ***,we introduce a simple procedure for se-lecting a mouse model of diffuse *** was induced in 24 mice using a standard filament perforation *** confirming survival at 24 h,SAH was scored 0-1 based on T2*-weighted images on whole-brain magnetic resonance imaging(MRI)and visual surveillance of the cisterna magna(CM)through the dura *** CM-based SAH grading correlated well with a reference parameter defined by extracted brain(r^(2)=0.53,p<0.0001).The receiver operating characteristic curve revealed a sensi-tivity of 85%and a specificity of 91%for detecting diffuse SAH,with a similar area under the curve(0.89±0.06[standard error of the mean])as the MRI-based grading(0.72±0.10,p=0.12).Our data suggest that confirming an SAH clot in the CM is a valuable way to select a clinically relevant diffuse SAH model that can be used in future experimental studies.

关键词： cisterna magna clot distribution filament perforation mouse model subarachnoid hemorrhage

The Properties of Nitrogenated Amorphous Carbon Films Grown by Microwave Surface-wave Plasma CVD: Effects of Gas Composition Pressure

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The Properties of Nitrogenated Amorphous Carbon Films Grown ...

Low Temperature Plasma CVD Grown Graphene by Microwave Surface-Wave Plasma CVD Using Camphor Precursor

第十五届国际光伏科学与工程大会

作者： Sudip Adhikari Hare Ram Aryal Ashraf M.M.Omer Sunil Adhikary Hideo Uchida masayoshi umeno Department of Electrical and Electronic Engineering Chubu University1200 Matsumoto-choKasugai 487-8501Japan Department of Electrical and Electronic Engineering Chubu University1200 Matsumoto-choKasugai 487-8501Japan Department of Electrical and Electronic Engineering Chubu University1200 Matsumoto-choKasugai 487-8501Japan Department of Electronics and Information Engineering Chubu University1200 Matsumoto-choKasugai 487-8501Japan Department of Electronics and Information Engineering Chubu University1200 Matsumoto-choKasugai 487-8501Japan Department of Electronics and Information Engineering Chubu University1200 Matsumoto-choKasugai 487-8501Japan

＜正＞ Nitrogenated amorphous carbon （a-C:N） thin films were grown on p-type silicon and quartz substrates by microwave surface wave plasma chemical vapor deposition （CVD） with various gas composition pressures （GCP）. The deposited a-C:N films were characterized for their optical, structural and electrical properties through UV/VIS/NIR spectroscopy, X-rays photoelectron spectroscopy, fourier transform infrared spectroscopy and solar simulator measurements. Optical absorption coefficient is decreased with increasing GCP. The roughness of the a-C:N is found to be very smooth （about 0.50 nm）. The film deposited at 90 Pa exhibited relatively good photovoltaic action compared to the films deposited at other GCPs.

关键词： Nitrogenated Amorphous Carbon Films MW SWP-CVD Gas Composition Pressure Films Properties

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Journal of Physical Science and Application 2016年第2期6卷 34-38页

作者： Hideo Uchida Hare Ram Aryal Sudip Adhikari masayoshi umeno Department of Electronics and Information Engineering Chubu University Matsumoto 1200 Kasugai Aichi 487-5801 Japan Institute for General Research of Science Chubu University Matsumoto 1200 Kasugai A ichi 487-5801 Japan

Hydrocarbon precursor such as methane has been widely used to grow graphene films and the methods of growing quality graphene films are dominated by thermal CVD (chemical vapor deposition) system. Graphene films grown by plasma process are generally highly defective which in turns degrade the quality of the films. Here, using a green precursor, camphor we demonstrate a simple and economical method to get high-quality graphene film on copper substrate by micro wave surface-wave plasma CVD at relatively low temperature 550℃. Graphene film grown using camphor shows superior quality than that of the film grown using methane. Results revealed that camphor precursor is a good alternative to hydrocarbon precursors for graphene research.

关键词：微波等离子体化学气相沉积石墨微波等离子体CVD 热化学气相沉积低温等离子体过程碳氢化合物膜生长

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DH结激光器频谱的精细结构

中国激光 1983年第Z1期 596-596页

作者： masayoshi umeno Masaru Niwa Shiro Sakai 日本名古屋理工学院工程科学系日本名古屋理工学院工程科学系日本名古屋理工学院工程科学系

在研制激光放大器和用来传递信息的相干光学传输系统时,半导体激光器光学振荡频率的稳定是一个重要的问题。因此,我们必须研究振荡激光谱的精细结构。在GaAlAs/GaAs和InGaAsP/InP双异质结结型激光器连续运转时,利用带光栅单色仪的高分... 详细信息

在研制激光放大器和用来传递信息的相干光学传输系统时,半导体激光器光学振荡频率的稳定是一个重要的问题。因此,我们必须研究振荡激光谱的精细结构。在GaAlAs/GaAs和InGaAsP/InP双异质结结型激光器连续运转时,利用带光栅单色仪的高分辨率法布里-帕罗干涉仪详细地观察了具有一定微波自调制的光谱。利用光栅单色仪从许多纵模谱线中仅仅取出单个主峰,并用由CO2气体压力控制的法布里-帕罗干涉仪对该主峰作了光谱分析,干涉仪的自由光谱范围为15或60GHz。

关键词：激光器精细结构连续运转光激射器电子器件多重分裂弛豫振荡 DH

Superfunctional high-entropy alloys and ceramics by severe plastic deformation

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Rare Metals 2023年第10期42卷 3246-3268页

作者： Parisa Edalati masayoshi Fuji Kaveh Edalati Department of Life Science and Applied Chemistry Nagoya Institute of TechnologyTajimi507-0071Japan Advanced Ceramics Research Center Nagoya Institute of TechnologyTajimi507-0071Japan WPI International Institute for Carbon-Neutral Energy Research(WPI-I2CNER) Kyushu UniversityFukuoka819-0395Japan Mitsui Chemicals Inc.—Carbon Neutral Research Center(MCI-CNRC)Kyushu UniversityFukuoka819-0395Japan

High-entropy alloys and ceramics containing at least five principal elements have recently received high attention for various mechanical and functional *** application of severe plastic deformation(SPD),particularly the high-pressure torsion method,combined with the CALPHAD(calculation of phase diagram) and first-principles calculations resulted in the development of numerous superfunctional high-entropy materials with superior properties compared to the normal functions of engineering *** article reviews the recent advances in the application of SPD to developing superfunctional high-entropy *** superfunctional properties include(ⅰ) ultrahigh hardness levels comparable to the hardness of ceramics in high-entropy alloys,(ⅱ) high yield strength and good hydrogen embrittlement resistance in high-entropy alloys;(ⅲ) high strength,low elastic modulus,and high biocompatibility in high-entropy alloys,(ⅳ) fast and reversible hydrogen storage in high-entropy hydrides,(ⅴ) photovoltaic performance and photocurrent generation on high-entropy semiconductors,(ⅵ) photocatalytic oxygen and hydrogen production from water splitting on high-entropy oxides and oxynitrides,and(ⅶ)CO_(2) photoreduction on high-entropy *** findings introduce SPD as not only a processing tool to improve the properties of existing high-entropy materials but also as a synthesis tool to produce novel high-entropy materials with superior properties compared with conventional engineering materials.

关键词： Multi-principal element alloys(MPEAs) High-entropy alloys(HEAs) High-entropy ceramics(HECs) High-entropy oxides(HEOs) Ultrafine-grained(UFG)microstructure High-pressure torsion(HPT)

Drug-induced lung injury caused by acetaminophen in a Japanese woman:A case report

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World Journal of Clinical Cases 2022年第27期10卷 9936-9944页

作者： masayoshi Fujii Tsuneaki Kenzaka Department of Internal Medicine Toyooka Public HospitalToyooka 668-8501Japan Department of Internal Medicine Hyogo Prefectural Tamba Medical CenterTamba 669-3495Japan Division of Community Medicine and Career Development Kobe University Graduate School of MedicineKobe 652-0032Japan

BACKGROUND All drugs have the potential to cause drug-induced lung injury both during and after drug *** has been reported to cause druginduced lung injury,although this is extremely ***,we present an extremely rare case of acetaminophen-induced *** SUMMARY A healthy 35-year-old Japanese woman visited a neighborhood clinic with complaints of fever and malaise following a tick *** treatment included1,500 mg acetaminophen(Caronal^(?)) and subsequently minocycline(200 mg) and acetaminophen(2,000 mg;Caronal^(?)) daily when her condition did not improve;the patient was eventually *** patient’s chest computed tomography(CT) revealed consolidation and ground-glass opacities in the right middle and lower *** was shifted to sulbactam/***,her fever did not improve during follow-up,and her chest CT revealed extensive ground-glass opacities in the right middle and lower lobes and thick infiltrative shadows in the bilateral basal ***-induced lung injury was suspected;hence,acetaminophen was *** fever resolved immediately,and inflammatory response and respiratory imaging findings improved.A drug-induced lymphocyte stimulation test was performed against acetaminophen(Caronal^(?)),and significant proliferation of lymphocytes was noted only for acetaminophen(stimulation index,2.1).CONCLUSION Even common drugs such as over-the-counter drugs can cause drug-induced lung damage.

关键词： Acetaminophen Computed tomography Pneumonia Fever Tick bite Case report