检索结果-南通市图书馆

Investigation of changes in properties of water under the action of a magnetic field

在线全文

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2008年第11期51卷 1621-1632页

作者： PANG XiaoFeng1,2 & DENG Bo1 1 Institute of Life Science and Technology, University of Electronic Science and Technology of china, Chengdu 610054, china 2 international Centre for materials physics, chinese academy of sciences, shenyang 110015, china 1. Institute of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China 2. international Centre for materials physics Chinese Academy of Sciences Shenyang 110015 China

The properties of water and their changes under the action of a magnetic field were gathered by the spectrum techniques of infrared, Raman, visible, ultraviolet and X-ray lights, which may give an insight into molecular and atomic structures of water. It was found that some properties of water were changed, and a lot of new and strange phenomena were discovered after magnetization. Magnetized water really has magnetism, which has been verified by a peak shift of X-ray diffraction of magnetized water + Fe3O4 hybrid relative to that of pure water + Fe3O4 hybrid, that is a saturation and memory effect. The properties of infrared and ultraviolet absorptions, Raman scattering and X-ray diffraction of magnetized water were greatly changed relative to those of pure water; their strengths of peaks were all increased, the frequencies of some peaks did also shift, and some new peaks, for example, at 5198, 8050 and 9340 cm?1, occurred at 25°C after water was magnetized. In the meanwhile, the magnetized effects of water are related to the magnetized time, the intensity of an externally applied magnetic field, and the temperature of water, but they are not a linear relationship. The study also showed a lot of new and unusual properties of magnetized water, for example, the six peaks in 3000–3800 cm?1 in infrared absorption, the exponential increase of ultraviolet absorption of wave with the decreasing wavelength of light of 200–300 nm, the frequency-shifts of peaks, a strange irreversible effect in the increasing and decreasing processes, as well as a stronger peak of absorption occurring at 50°C, 70°C and 80°C, the existence of many models of motion from 85°C to 95°C in 8000–10000 cm?1, and so on. These results show that the molecular structure of water is very complicated, which needs further study. Furthermore, the macroscopic feature of mechanics, for instance, surface tension force of magnetized water, was also measured. Experiments discovered that the size in contact angle

关键词： pure water magnetized water magnetic-field physical property spectrum saturation and memory effect mechanical feature surface tension force polarization angles of contact

Hard Magnetic Properties of Sm-Fe-C Based Alloys Prepared by Mechanical Alloying

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2000年第2期16卷 125-126页

作者： Dianyu GENG, Zhidong ZHANG, Baozhi CUI, Zhijun GUO, Wei LIU and Xinguo ZHAO (international center for materials physics, Institute of Metal Research, chinese academy of sciences, shenyang 110015, china) international center for materials physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The structure and magnetic properties of SmyFe100-1.5yC0.5y(y=8～20) alloys prepared by mechanical alloying (MA) from Sm, Fe and graphite have been investigated systematically. In order to improve hard magnetic properties of the alloys prepared by mechanical alloying, a new method consisting of re-milling and re-annealing was developed. After being re-milled and re-annealed, the Curie temperature TC of the Sm-Fe-C alloys changes. The TC of 2:17 phase increases, whereas the TC of 2:14:1 phase decreases. After being re-annealed at low temperatures, the grain sizes of hard phases are smaller than those in the alloys annealed at high temperatures. The effects of Co or Ti substitution for Fe are studied.

关键词： Fe Hard Magnetic Properties of Sm-Fe-C Based Alloys Prepared by Mechanical Alloying Sm

The effect of hydrogen on the electronic structure of kink in bcc iron

在线全文

学校读者我要写书评

暂无评论

Science china(Technological sciences) 2009年第5期52卷 1212-1218页

作者： CHEN LiQun1,QIU ZhengChen1,YU Tao2 & WANG ChongYu2,3,4 1 College of sciences,Central South University of Forestry and Technology,Changsha 410004,china 2 Central Iron and Steel Research Institute,Beijing 100081,china 3 Department of physics,Tsinghua University,Beijing 100084,china 4 international center for materials physics,chinese academy of sciences,shenyang 110016,china 1. College of sciences Central South University of Forestry and Technology Changsha 410004 China 2. Central Iron and Steel Research Institute Beijing 100081 China 3. Department of physics Tsinghua University Beijing 100084 China 4. international center for materials physics Chinese Academy of Sciences Shenyang 110016 China

The electronic structures of kinks in the [100](010) and 1/2[111](-110) edge dislocations in bcc iron containing hydrogen are investigated by means of the first-principles DMol method and the discrete variational *** effects of hydrogen on the kinks are *** results show that hydro-gen forms weak bonding states with its neighboring host atoms,and since hydrogen draws charge from its neighboring host atoms,the interactions between most of the host atoms are weakened com-pared with those of the corresponding atomic pairs in the clean *** indicates that the migration of kink,*** motion of dislocation,is easier in the doping hydrogen kink than in the clean kink,which may be the solid solution softening effect resulting from the impurity hydrogen.

关键词： electronic structure dislocation kink impurity

Molecular dynamics simulation of kink in 〈100〉 edge dislocation in body centred cubic iron

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 2007年第16期52卷 2291-2296页

作者： CHEN LiQun1,2,WANG ChongYu2,3,4 & YU Tao2 1 College of sciences,Central South University of Forestry & Technology,Changsha 410004,china 2 Central Iron and Steel Research Institute,Beijing 100081,china 3 Department of physics,Tsinghua University,Beijing 100084,china 4 international center for materials physics,chinese academy of sciences,shenyang 110016,china College of sciences Central South University of Forestry and Technology Changsha 410004 China

Using the molecular dynamics method,we have constructed two kink models corresponding to the 〈100〉{010} and 〈100〉{011} edge dislocations (EDs) in body centred cubic (bcc) Fe. It is found that the geometric structure of a kink depends on the type of edge dislocation and the structural energies of the atoms sites in the dislocation core region. The formation energies,migration energies and widths of the kinks in different types of EDs are calculated. The results show that formation and migration of the kink in the 〈100〉{010} edge dislocation are difficult. The 〈100〉{011} edge dislocation moves primarily through kink nucleation,rather than kink migration.

关键词：分子动力学边缘位移铁纽结结构

Microstructure characterization of high-energy product Nd-Fe-B thin film

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:materials international 2010年第01期20卷 76-80页

作者： Fang XU~1,Fang YANG~2,Xian-ping DONG~1,Lan-ting ZHANG~1,Wei LIU~2,Zhi-dong ZHANG~2 1.School of materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,china 2.shenyang National Laboratory for materials Science,Institute of Metal Research and international Centre for materials physics,chinese academy of sciences,shenyang 110016,china [a] School of materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China [b] shenyang National Laboratory for materials Science Institute of Metal Research and International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

A Si/Mo（50 nm）/Nd-Fe-B（400 nm）/Mo（50 nm）film with relatively high-energy product（BH）max=247 kJ/m3)was prepared on a Si substrate heated at 650℃.The microstructure of the film was investigated by X-ray diffractometry（XRD）and high-resolution transmission electron microscopy（HRTEM）.The Nd-Fe-B thin film shows a notable out-of-plane c-axis *** （110）orientated Mo grains is proved to promote the growth of c-axis oriented texture of the Nd2Fe14B grains,which is favorable to achieve a high ***-scale spherical Nd-O phases composed of randomly orientated polycrystalline grains and a sharp grain boundary without grain boundary phase between two Nd2Fe14B grains are *** coercivity highly depends on a certain amount of Nd-O phase and interface morphology.

关键词： Nd-Fe-B thin films microstructure Nd-O phase magnetic properties

ANALYSIS OF THE GROWTH MECHANISM OF TiAl_3 WHISKERS PREPARED BY IN SITU REACTION IN MOLTEN ALUMINUM

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1997年第5期10卷 403-408页

作者： B. Yang YQ. Wang J. Zhang and B.L. Zhou （Institute of Metal Research, chinese academy of Sciellces, shenyang 110015, china Nanchang University, Nanchang 330029, china international center for materials physics, chinese academy of sciences, shenyang Inst of Metal Research Chinese Acad of Sciences Shenyang China

Some TiAl3 whiskers are found to be produced simultaneously during the formation process of TiB2 Particulates fabricated by in situ reaction in molten aluminum. The thec t of temperature of molten aluminum on the morphologies of the TiAl3 whiskers and the growth mechanism of the whiskers are studied in this paper. The results show that the aspect rutio of the TiAl3 whiskers decreases with the increase of the temperoture. The growth of the whiskers is proved to be controlled by a Vapor-LiquidSoltd (VLS) mechanism. The titanium and aluminum atoms in the catalytic droplet,however, have been coofrmed to react with each othen which is dtherent from other whlskcrs growing by a VLS mcchanism where the compostion in the catalytic droplet is a constant.

关键词： in situ reaction TiAl_3 whisker morphology growth mechanism

Electronic Structure of the Clusters Containing Oxygen in Ni

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 1996年第6期12卷 427-433页

作者： Tao YU Chongyu WANG and Bing WANG (Central Iron and Steel Research Institute, Beijing 100081, china)(To whom correspondence should be addressed)( The international Centre for materials physics of the chinese academy of sciences, shenyang 110015, china) Central Iron and Steel Research Institute Beijing 100081 China international Centre for materials physics Chinese Academy of Sciences Shenyang 110015 China

The electronic structure of the clusters containing oxygen, the stacking fault and the complex in the transition metal Ni are calculated by the multiple-scattering Xa method. Energy levels,density of states and transfer of charge are obtained. Based on the calculation and analysis,the influences of impurity oxygen and structure defect on the electronic structure of the clusters are discussed, and it is found that the local Ni-o cluster with the interstitial oxygen is a stable atomic configuration.

关键词： Rev Electronic Structure of the Clusters Containing Oxygen in Ni Wang

High-pressure synthesis and properties of CeO_2-ZrO_2 solid solution

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 2001年第10期46卷 801-806页

作者： XU Dapeng, WANG Quanyong, LU Zhe, LIU Zhiguo, ZHANG Gongmu & SU Wenhui1. Department of physics, Jilin University, Changchun 130023 china 2. international center for materials physics, chinese academy of sciences, shenyang 110015, china 3. center for Condensed Matter and Radiation physics, china center of Advanced Science and Technology (World Laboratory), Beijing 100080, china Department of physics Jilin University Changchun China international center for materials physics Chinese Academy of Sciences Shenyang China center for Condensed Matter and Radiation physics China Center of Advanced Science and Technology (World Laboratory) Beijing China

Using nanoparticles of CeO2 and ZrO2 prepared by the chemical precipitation method as starting materials, the single-phase cubic Ce0.5Zr0.5O2 solid solution (c-Ce0.5Z0.5O2) has been synthesized under 3.1 GPa at 1073 K for the first time. The structure of the c-Ce0.5Zr0.5O2 has not been changed before and after annealing at 773 K for 1 h. Only an unknown EPR signal (g =1.990) has been observed in the c-Ce0.5Zr0.5O2 and not varied after annealing at 773 K for 1 h, which exhibited that there exists no Ce3+ in the c-Ce0.5Zr0.5O2 and the Ce4+ has not been reduced into Ce3+ after annealing. The transport mechanism is ionic for the c-Ce0.5Zr0.5O2. The bulk conductivity (a =1.2×10-5 S/cm at 823 K, σ=2.1 ×10-3 S/cm at 1123 K) is the same as that of CeO2, but smaller than that of Y2O3-stabilized ZrO2. A marked curvature at T = 823 K has been observed in the Arrhenius plot of the bulk conductivity. The activation energy below 823 K is lower than that above 823 K, and the reason has been discussed.

关键词： CeO2-ZrO2 nanocrystalline high-pressure and -temperature solid-state reaction solid solution.

Role of Interatomic Force to Critical Resolved Shear Stress of Single Crystals

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 1999年第4期15卷 307-310页

作者： Chiwei LUNG and Jingynng WANG(international Centre for materials physics, Institute of Metal Research, chinese academy of sciences,shenyang 110015, china)T0 whom correspondence should be addressed E-mail: qwlong@imr.ac .cn international Centre for materials physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Experimental results of the temperature dependence of critical resolved. shear stresses (CRSS)of Mo, Fe, Al and Mg single crystals are shown. Associating reports in recent years, we point out that the approximate exponential relationship between CRSS and the absolute temperatureat least in the region of the steep temperature dependence range of many materials is more common, even for bcc, fcc, and hcp single crystals. polycrystals and other covalent crystals,provided that the slip plane and slip direction are kept the same. Successful explanation with atomic force law shows that the interatomic forces (electronic structure) play a decisive role in determining the temperature dependence of yield stresses for a large number of materials.

关键词： Role of Interatomic Force to Critical Resolved Shear Stress of Single Crystals