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Synthesis of Magnetically Intensified Aluminosilicate

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Journal of Iron and Steel Research International 2012年第S1期19卷 327-330页

作者： iwai kazuhiko ASANO Makoto HAGIO Takeshi EcoTopia Science Institute Energy Science Research DepartmentNagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan Department of Materials Physics and Energy EngineeringNagoya UniversityFuro-choChikusa-kuNagoya464-8603Japan

Intensification of magnetic susceptibility of the zeolite ensures not only quick and reliable separation of the zeolite from waste medium by using a magnetic separation but also efficient micro-wave heating of the ***, reinforcement of magnetic susceptibility of the zeolite has been *** this study,a composite material has been synthesized by adding magnetite during a synthesis process of the *** the composite was evaluated by using XRD and *** was composed of zeolite and ***,its shape was polygonal with a few micrometers size under the synthesis time of 4 *** magnetization in magnitude was about 400 times larger than that of the normally synthesized *** the mass ratio of the zeolite and the magnetite in the synthesized material was estimated at about 7.8:1.

关键词： zeolite magnetization synthesis magnetite magnetic separation

Synthesis of Magnetically Intensified Aluminosilicate

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Synthesis of Magnetically Intensified Aluminosilicate

第七届冶金与材料电磁过程国际会议（EPM2012）

作者： iwai kazuhiko ASANO Makoto HAGIO Takeshi EcoTopia Science Institute Energy Science Research DepartmentNagoya University Department of Materials Physics and Energy EngineeringNagoya University

Intensification of magnetic susceptibility of the zeolite ensures not only quick and reliable separation of the zeolite from waste medium by using a magnetic separation but also efficient micro-wave heating of the ***,reinforcement of magnetic susceptibility of the zeolite has been *** this study,a composite material has been synthesized by adding magnetite during a synthesis process of the *** the composite was evaluated by using XRD and *** was composed of zeolite and ***,its shape was polygonal with a few micrometers size under the synthesis time of 4 *** magnetization in magnitude was about 400 times larger than that of the normally synthesized *** the mass ratio of the zeolite and the magnetite in the synthesized material was estimated at about 7.8:1.

关键词： zeolite magnetization synthesis magnetite magnetic separation

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有无电磁场作用下S45C钢的凝固组织

现代冶金（内蒙古） 2012年第2期 33-36页

作者： kazuhiko iwai[日本]

研究了S45C碳钢凝固时，同时接受垂直方向的静态磁场作用以及具有水平分量的交流电。因此，受到电磁力作用的试样，在凝固过程中受到电磁力的影响，将不同电磁搅拌条件下的凝固试样进行切割，然后用化学侵蚀以观察其宏观和显微组织，并... 详细信息

研究了S45C碳钢凝固时，同时接受垂直方向的静态磁场作用以及具有水平分量的交流电。因此，受到电磁力作用的试样，在凝固过程中受到电磁力的影响，将不同电磁搅拌条件下的凝固试样进行切割，然后用化学侵蚀以观察其宏观和显微组织，并且对它们进行了比较。没有实施静态磁场和交流电的钢中，其显微组织为枝晶结构。另一方面，在1特斯拉静态磁场和80A，2KHZ的交流电作用下，其凝固组织为等轴结构。当磁场强度减少到0．3T时，部分凝固组织为等轴结构。在磁场强度为1T常数下，改变交流电频率，使其数值低于80A，凝固组织从等轴结构变为枝晶结构。晶粒细化机理假定为通过电磁力不均匀的分布，对试样进行对流感应后，将枝晶打碎成碎片，使其转变成等轴结构，通过提高电流频率强化电磁力。

关键词：凝固显微组织磁场交流电

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电磁场作用对钢的组织结构控制

电磁场作用对钢的组织结构控制

Miyaoka-type inequalities for terminal threefolds with nef anti-canonical divisors

作者： kazuhiko iwai Takenori Kohama 日本名古屋大学Eco-topia科学研究所

在垂直方向的静态磁场和水平方向的直流电或者交流电的同时作用下进行了碳素钢凝固。电磁力作用于钢,从而会影响凝固过程的组织形态。切割和侵蚀在不同电磁力作用下凝固的试样,以观察宏观和微观的组织形貌。没有电磁力作用下形成的凝固... 详细信息

在垂直方向的静态磁场和水平方向的直流电或者交流电的同时作用下进行了碳素钢凝固。电磁力作用于钢,从而会影响凝固过程的组织形态。切割和侵蚀在不同电磁力作用下凝固的试样,以观察宏观和微观的组织形貌。没有电磁力作用下形成的凝固组织是枝晶晶粒结构。相反,在0.3T静态磁场和20A直流电的共同作用条件下形成球状晶结构。在0.3T静态磁场和80A、2kHz交流电的共同作用条件下凝固组织只是有一部分是球状晶结构。因此,从电流强度的角度来看,改善凝固组织由枝晶晶粒到球状晶粒结构的转变,静态电磁场和直流电的共同作用更好于静态电磁场和交流电的共同作用。

关键词：凝固微观组织磁场电流

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Science China Mathematics 2024年

作者： Masataka iwai Chen Jiang Haidong Liu Department of Mathematics Graduate School of Science Osaka University Shanghai Center for Mathematical Sciences & School of Mathematical Sciences Fudan University Department of mathematics Sun Yat-sen University

In this paper,we study Miyaoka-type inequalities on Chern classes of terminal projective 3-folds with nef anti-canonical *** X be a terminal projective 3-fold such that-KXis *** show that if c1（X）·c2（X）≠0,then c1（X）·c2（X）≥1/252;if further X is not rationally connected,then c1（X）·c2（X）≥4/5 and this inequality is *** order to prove this,we give a partial classification of such varieties along with many *** also study the nonvanishing of c1（X）dimX-2·c2（X） for terminal weak Fano varieties and prove a Miyaoka-Kawamata-type inequality.

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Ecotoxicological assessment of diffuse pollution using biomonitoring tool for sustainable land use in Thailand

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Journal of Environmental Sciences 2010年第6期22卷 858-863页

作者： Chuleemas Boonthai iwai Barry Noller Department of Plant Sciences and Agricultural Resources Land Resourcesand Environment SectionFaculty of AgricultureKhon Kaen University The University of Queensland Centre for Mined Land Rehabilitation (CMLR)

As a developing country, Thailand has a significant issue with diffuse pollution of the soil ecosystem due to an indiscriminate use of agrichemicals and poorly regulated disposal of a wide variety of hazardous wastes. Practical risk assessment tools based on locallyoccurring species are needed to assess the effects of diffuse pollutants on the soil ecosystem in Thailand because reliance on soil criteria developed for overseas conditions may provide inadequate protection. Native soil organisms in Thailand may be more or less sensitive to contaminants compared to overseas test species. This article described a biological indicator approach for ecological risk assessment of diffuse pollution in the soil ecosystem of Thailand from pesticide application with the aim of developing standardized protocols using native species and locally generated data to better evaluate the ecological risks of non-point source soil pollution. It was found that ecotoxicological assessment provided a better understanding of the ecological impacts that diffuse pollution induced on Thai environmental conditions. Thai soil biota species were more sensitive to soil contaminants than similar species overseas. Soil series also had an influence on the ecotoxicology of contaminants to soil biota. Collembolan, Cyphoderus sp., was demonstrated as a useful alternative test species to Folsomia candida （international test species） for terrestrial ecotoxicological testing of Thai soils. In addition, the soil biota activities such as soil respiration and earthworm avoidance including soil biodiversity and the litter bag decomposition technique are also good tools to assess the effects of diffuse pollution by pesticides on the soil ecosystem of Thailand.

关键词： ecotoxicological assessments diffuse pollution biomonitoring soil ecosystem

Role of Al_2O_3 fiber in eutectic Al-Si alloy composites

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中国有色金属学会会刊：英文版 2002年第5期12卷 904-908页

作者：翟秋亚徐锦锋 Y.iwai School of Materials Science and Engineering Xi′an University of Technology Xi′an 710048 China School of Materials Science and Engineering Xi′an University of Technology Xi′an 710048 ChinaLaboratory of Materials Science in Space Northwestern Polytechnical University Xi′an 710072 China Department of Mechanical Engineering Fukui University Fukui 910-8507 Japan

The effects of Al 2O 3 fiber on wear characteristics of eutectic Al-Si alloy composites were studied using a pin-on-disk tester under dry sliding condition. The results show that the Al 2O 3 fiber can make matrix grain be fine, specially the eutectic Si be finer and prevent the plastic flow of matrix and prohibit the crack propagation in the wear layer, thereby it can remarkably improve the mechanical property and the wear resistance of the MMCs. Since Al 2O 3 fiber plays a role of certain framework in protecting the matrix against crash, it can eliminate the severe wear of MMCs with higher φ f of fiber from the beginning of test. At mild stage, when φ f is in the range of 8%～10%, the wear rates are the lowest. With increasing φ f of Al 2O 3 fiber, the wear mechanism of MMCs can be transformed from adhesive delamination to brittle breakaway.

关键词：共晶铝硅合金氧化铝光纤复合物耐磨机械装置

Effects of alternating current imposition and alkaline earth elements on modification of primary Mg_2Si crystals in hypereutectic Mg-Si alloy

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中国有色金属学会会刊：英文版 2009年第5期19卷 1051-1056页

作者：杜军 K.iwai 李文芳彭继华 School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China Department of Materials Physics and Energy Engineering Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan

The effects of alternating current imposition and/or alkaline earth elements on modification of the primary Mg2Si crystals in the hypereutectic Mg-Si alloy were *** alternating current of 60 A with frequency of 1 kHz was applied into the hypereutectic Mg-Si melt which was alloyed with alkaline earth elements or not in the fixed temperature range from 700 to 630℃. The results show that the primary Mg2Si crystals could be refined by imposing alternating current or adding alkaline elements. Compared with the samples treated by adding 0.4%Ca or 0.4%Sr,higher modification efficiency could be obtained for the samples treated by imposing alternating *** further modification efficiency could be obtained for the samples treated by imposing alternating current combined with 0.4%Ca or 0.4%Sr addition.

关键词： Mg2Si 金属元素交流电碱土修改晶体合金镁

Model tests and corresponding numerical simulations on cave model subjected to thermo-mechanical loading

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Underground Space 2022年第2期7卷 162-183页

作者： Peng Peng Hiromasa iwai Eishi Ohne Yusuke Itani Feng Zhang Department of Civil Engineering Nagoya Institute of TechnologyShowa-kuGokiso-choNagoya 466-8555Japan

Geological repository of high-level nuclear waste(HLNW),the most feasible approach for the safe and permanent treatment of HLNW without human intervention,has been investigated for years by many *** some countries,real facilities for the geo-logical repository are already under *** Japan,however,due to complicated geologic conditions,especially underground water and fractured rock masses,and the high risk of natural disasters,ensuring the long-term stability of the method remains a *** influential factors include underground water,heat generation from radioactive waste,and thermal and chemical weathering of the surrounding rock mass as a natural *** is difficult to estimate and verify the long-term stability for up to one hundred thousand years,a complicated thermal-hydraulic-mechanical-chemical coupling behavior,via any field *** objective of the study is to develop a numerical method for predicting the long-term stability of geological *** the first step toward realizing this objec-tive,heating and loading tests on cave model made of man-made rock specimens that are composed of diatoms,gypsum,and water,which are viscoplastic materials,were conducted,based on which a newly proposed numerical method with finite element method(FEM)was used to describe the thermal,mechanical,and time-dependent behavior of the model tests for a geological *** ensure the accuracy of the numerical calculations,all the material parameters in the thermoelasto-viscoplastic model with consideration of overconsolidation,the structure,and the influence of intermediate stress were determined via triaxial compression/creep tests under various temperatures,confining stresses,and loading ***,the validity of the numerical method was demonstrated by model tests over a limited time span.

关键词： Geological repository High-level nuclear waste Heating and loading test Cave model Thermoelasto-viscoplasticity FEM Long-term stability