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飞秒激光空间选择性诱导玻璃微结构及应用

材料研究学报 2003年第1期17卷 1-9页

作者：邱建荣钱国栋 kazuyuki hirao 中国科学院上海光学精密机械研究所光子技术国际合作实验室浙江大学 Graduate School of Engineering Kyoto University

利用飞秒激光与玻璃的非线性相互作用,可以对玻璃进行空间选择性微观改性与修饰,赋予新的光功能。本文介绍飞秒激光的特点及其对玻璃微结构的改性,以及近年来利用飞秒激光进行玻璃的缺陷控制、光活性离子(稀土、过渡和重金属离子)价态... 详细信息

利用飞秒激光与玻璃的非线性相互作用,可以对玻璃进行空间选择性微观改性与修饰,赋予新的光功能。本文介绍飞秒激光的特点及其对玻璃微结构的改性,以及近年来利用飞秒激光进行玻璃的缺陷控制、光活性离子(稀土、过渡和重金属离子)价态操作、微晶析出与折射率调控及其在光开关、波分复用、波导型有源器件、光子晶体等微光学器件的制备及光学集成领域应用的进展。

关键词：飞秒激光玻璃微结构空间选择性微观改性修饰光功能光子玻璃非线性相互作用

Three-dimensional Deposition of Silicon Structure from Silicate Glass with Dispersed Metallie Muminum by Femtosecond Laser Irradiation

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Journal of Wuhan University of Technology(Materials Science) 2007年第B12期22卷 783-786页

作者： Masashi Hamabe Kiyotaka Miura Yasuhiko Shimotsum Masaaki Sakakura Shingo Kanehira Masayuki Nishi kazuyuki hirao Department of Material Chemistry Kyoto University KatsuraNisikyo-kuKyoto 615-8510Japan Department of Material Chemistry Kyoto University KatsuraNisikyo-kuKyoto 615-8510Japan International Innovation CenterKyoto UniversityNisikyo-kuKyoto 615-8510Japana

We fabricated a silicon structure in silicate glass prepared with metallic aluminum in the starting material, using femtosecond laser irradiation. Small Si-rich structures such as Si clusters were transformed into larger, but still nano-sized, Si particles by laser irradiation. These structures grew to microsize particles due to the thermite reaction promoted by heat treatment. We determined the effect of focused laser pulses on the Si deposition process using the time-resolved transient lens method. Localized high-temperature, high-pressure, and the generation of shock waves appear to be very important in forming the Si-rich structures that ultimately grow into Si particles.

关键词： three-dimensional deposition femtosecond laser silicon structure

Effect of Biogas Digested Liquid on CH_4 and N_2O Flux in Paddy Ecosystem

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Journal of Integrative Agriculture 2014年第3期13卷 635-640页

作者： Ankit Singla kazuyuki Inubushi Bioresource Science Graduate School of Horticulture Chiba University

Biogas production generates digested slurry as a byproduct. It can be used as a fertilizer especially after its conversion into digested liquid. A pot based study was conducted in order to evaluate the effect of the application of digested liquid on CH4 and N2O flux, and plant biomass in paddy. Analysis revealed that digested liquid treated soils released more CH4 compared to ammonium sulphate and the control. Ammonium sulphate treated soil emitted the highest N20 whereas digested liquid application decreased its emission significantly. Further, the cumulative emission over 101 d of the experiment was found to be higher for CHa （16.9 to 29.9 g m^-2） compared to N20 （-49.3 to 18.9 mg m^-2） for all treatments. Digested liquid application had positive impact on plant variables such as panicle number and weight of panicles. This study suggests that digested liquid application significantly decrease N20 emission and increase CH4 emission possibly due to affecting the availability of organic C in the soil to microbial activity for methanogenesis. Another possibility for enhancing CH4 emission by following biogas digested liquid could be attributed to the increase in plant biomass.

关键词： biogas digested liquid paddy ammonium sulphate CH4 N20 plant biomass

Effect of process parameters on microstructural and mechanical properties of *** 304L explosive cladding

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Journal of Central South University 2017年第6期24卷 1245-1251页

作者： Saravanan Somasundaram Raghukandan Krishnamurthy Hokamoto kazuyuki Department of Mechanical Engineering Annamalai UniversityAnnamalai NagarTamilnadu 608002India Department of Manufacturing Engineering Annamalai UniversityAnnamalai NagarTamilnadu 608002India Institute of Pulsed Power Science Kumamoto UniversityKurokamiKumamotoJapan

The present work pertains to the study of microstructure and mechanical properties of explosively cladded commercially pure titanium(cpTi) with austenitic stainless steel(SS 304L) subjected to varied process parameters, viz., loading ratios(mass of explosive or mass of flyer plate) and preset angles. The microstructural study reveals the transformation from straight to wavy interface while increasing loading ratios. Vickers hardness increases with loading ratios, and the maximum hardness is witnessed in the closer proximity of collision interface. Ram tensile and shear strength of explosive claddings are higher than that of parent plates. While the base plate fails in impact test, the flyer plate is deformed, indicating good impact strength. Increased mass of claddings, due to oxide formation, is witnessed in corrosion tests, which confirms the superiority of explosive claddings in corrosive environment. Triaxial weldability window, an analytical estimation for Ti-SS 304L explosive claddings, is developed and correlated.

关键词： explosive cladding titanium stainless steel microstructure strength corrosion

Synchrotron radiation studies of the orientation of thin silicon phthalocyanine dichloride film on HOPG substrate

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Chinese Physics C 2008年第9期32卷 769-772页

作者：邓居智陈荣 SEKIGUCHI Tetsuhiro BABA Yuji hirao Norie HONDA Mitsunori Key Laboratory of Nuclear Resources and Environment (East China Institute of Technology) Ministry of Education Synchrotron Radiation Research Center Japan Atomic Energy Agency

Thin silicon phthalocyanine dichloride films on HOPG were prepared and the sample was heated in the vacuum with laser. The thickness of the thin sample on HOPG was checked by X-ray photoemission spectroscopy. The orientation of the molecules in respect to the substrate plane was investigated by measuring the silicon K-edge near edge X-ray absorption fine structure （NEXAFS）. In the NEXAFS spectra of the thin sample, two clear peaks which were assigned to Is → σ^＊Si-N and 1s→ σ^＊Si-Cl appeared around 1847.2 eV and 1843.1 eV respectively. The intensities of the resonance peaks showed strong polarization dependence. A quantitative analysis of the polarization dependence revealed that the Si-N bond tended to lie down while the Si-Cl bond was out of the molecular plane.

关键词： near edge X-ray absorption fine structure (NEXAFS) orientation silicon phthalocyanine dichloride polarization dependence

Soil Acidification Stimulates the Emission of Ethylene from Temperate Forest Soils

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Advances in Atmospheric Sciences 2009年第6期26卷 1253-1261页

作者：徐星凯 kazuyuki INUBUSHI State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of Sciences Graduate School of Horticulture Chiba UniversityMatsudo

Soil acidification via acid precipitation is recognized to have detrimental impacts on forest ecosystems, which is in part associated with the function of ethylene released from the soil. However, the impacts of acidification on the cycling of ethylene in forest soils have not been fully taken into consideration in global change studies. Forest topsoils （0-5 cm） under four temperate forest stands were sampled to study the effects of a pH change on the emissions of ethylene and carbon dioxide from the soils and concentrations of dissolved organic carbon （DOC） released into the soils. Increasing acidification or alkalinization of forest soils could increase concentrations of DOC released into the soils under anoxic and oxic conditions. The ethylene emission from these forest topsoils could significantly increase with a decreasing pH, when the soils were acidified experimentally to a pH〈4.0, and it increased with an increasing concentration of DOC released into the soils, which was different from the carbon dioxide emission from the soils. Hence, the short-term stimulating responses of ethylene emission to a decreasing pH in such forest soils resulted from the increase in the DOC concentration due to acidification rather than carbon mineralization. The results would promote one to study the effects of soil acidification on the cycling of ethylene under different forest stands, particularly under degraded forest stands with heavy acid depositions.

关键词： soil acidification carbon dioxide dissolved organic carbon ethylene emission volcanic soil

Numerical Study of the Effects of the Secondary Diaphragm and Contact Surface in Expansion Tubes

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Journal of Thermal Science 2004年第1期13卷 30-33页

作者： kazuyuki Kage Katsuya Ishimatsu Toyoyasu Okubayashi Department of Production Systems Engineering Oita University700 DannoharuOita870-1192JapanDepartment of Production Systems EngineeringOita University700 DannoharuOita870-1192JapanDepartment of Production Systems EngineeringOita University700 DannoharuOita870-1192Japan

The interaction of the shock reflected at a secondary diaphragm with the primary contact in six cases, i.e. the strengths and shapes of the contact surface are different, were explored by numerical study. The influences of the strength and shape of the contact on the developing wave pattern and the quality of the test gas are illustrated by many kinds of figures (e.g. the time-distance diagrams of the acoustic impedance contours on the axis, the acoustic impedance contours, and the time histories of pilot and static pressures).

关键词： expansion tubes secondary diaphragm shock propagation contact surface

Numerical Study of Shock Waves Propagating through Right Angled Multiple Elbows

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Journal of Thermal Science 2005年第3期14卷 254-257页

作者： kazuyuki KAGE Mihoko SHIROYAMA Katsuya ISHIMATSU Department of Mechanical and Energy Systems Engineering Oita University 700 Dannoharu Oita 870-1192 Japan ProfessorDepartment of Mechanical and Energy Systems Engineering Oita University 700 Dannoharu Oita 870-1192 JapanDepartment of Mechanical and Energy Systems Engineering Oita University 700 Dannoharu Oita 870-1192 Japan

The details of the shock propagated through the right angled multiple elbows (mainly double elbow and fourfold elbow) are investigated by the numerical study. Computations were carried out by solving the two-dimensional compressible Navier-Stokes equations by using the total variation diminishing (TVD) scheme. Computations were performed for six types of elbow (two types of double elbow and four types of fourfold elbow) and two incident shock Mach numbers (Ms=1.5, 2.3). The effects of the direction and number of the bends in the stabilizing, merging and attenuating processes of the shock are numerically explored by various diagrams such as pressure contours, pressure distributions on the walls and time histories of the pressure contours, and the strength of the shock front at the location of about 20 times the length for each type of elbows was displayed.

关键词： shock wave multiple elbow shock diffraction non-uniform shock merger of shock

Challenges of reducing excess nitrogen in Japanese agroecosystems

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Science China(Life Sciences) 2005年第Z2期48卷 928-936页

作者： kazuyuki YAGI Katsuyuki MINAMI National Institute for Agro-Environmental Sciences (NIAES) Tsukuba 305-8604 Japan

Fertilizer N use in Japan has decreased by about 30% from 1960 to 2000, while keeping a little increase in cereal yields. This has resulted in a significant increase in apparent nitrogen use efficiency, in particular for rice. On the other hand, national N load on the environment associated with the production and consumption of domestic and imported agricultural products has almost tripled during this period, mainly due to the dramatic increase of imports of food and feedstuffs. The environmental problems, including water and air pollution, caused by the excessive loads of N are serious public concerns and there is an urgent need to minimize N losses from agricultural production. In order to meet the necessity for reducing the environmental impacts by excess N, political and technological measures have been taken at regional and country levels. In recent years, the Japanese government has embarked on a series of policies to encourage transition to an environmentally conscious agriculture. Promoting proper material circulation with reducing fertilizer impact and utilizing biomass and livestock wastes is emphasized in these policies. The effectiveness of environmental assessment and planning for reducing regional and national N load has been discussed. Implementation of environmentally friendly technologies and management, both conventional and innovational, have been developed and adopted in Japanese agriculture. The effectiveness of conventional technologies in reducing environmental reactive N has been re-evaluated. Innovative technologies, such as use of controlled availability fertilizers and livestock wastes compost pellets, are being investigated and extended. A comprehensive approach that applies political and technological measures with closer cooperation is necessary to control reactive N in the environment.

关键词： nitrogen use efllciency nitrogen load environmental impacts nitrogen fertilizer Japan.