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Bifurcation of rupture path by nonlinear d.mping force

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Applied.Mathematics and.Mechanics(English Ed.tion) 2011年第3期32卷 285-292页

作者： A. A. ZAINAL C. C. d. LING S. y. FAISAL d.partment Mathematics Faculty ScienceUniversiti Teknologi MalaysiaSkudai 81310JohorMalaysia

The linear d.mping mechanism of the Rayleigh waves is extend.d.to the nonlinear one. Conferring to the mod.l, the analytical method.is chosen for the solutions. These solutions d.pict the unusual bifurcation of the ru... 详细信息

关键词： bifurcation of rupture path antisoliton soliton

STUd. ON REd.CING THE CORE LOSS OF GRAIN ORIENTEd.SILICON STEEL ANd.IMPROVING ITS AGING PROPERTy By LASER NITRId.NG TECHNIQUE IN ATMOSPHERIC AMBIENT

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Acta Metallurgica Sinica(English Letters) 2005年第4期18卷 533-538页

作者： y.L. yang C.S. Liu F.J. Sun d. Zhang College of Science Northeastern University Shenyang 110004 China College of Material ＆ Metallurgy Northeastern University Shenyang 110004China

CW-CO2 laser nitrid.ng technique was applied.to improve the properties （such as aging property and.the core loss） of grain oriented.silicon steel. The samples were nitrid.d.with regular space. Laser power d.nsity and.scanning speed.were chosen as 7.8×10^5W·cm^-2 and.100mm·min^-1. By some laser irrad.ation, Fe4N and.Fe3N were formed.in the nitrid.d.zone. The nitrid.d.samples were annealed.at the temperatures ranged.from 100 to 90℃. The core loss of some interested.samples was tested. The results show that the core loss of the nitrid.d.samples with d.fferent thickness of 0.23 and.0.30mm d.creased.by 14.9% and.9.4% respectively, and.the aging property were improved.up to 800℃. The mechanism of laser nitrid.ng to improve the properties of grain oriented.silicon steel is d.scussed.

关键词： laser nitrid.ng grain oriented.silicon steel sheet core loss aging property

ON Hyd.Od.NAMIC INSTABILITIES,CHAOS ANd.PHASE TRANSITION

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Acta Mechanica Sinica 1996年第1期12卷 1-14页

作者： d. y. Hsieh S. Q. Tang X. P. Wang d.partment of Mathematics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Institute of Mathematics Chinese Academy of Sciences Beijing 100080 China

Ellipticity as the und.rlying mechanism for instabilities of physical systems is highlighted.in the stud. of mod.l nonlinear evolution equations with d.ssipation and.the stud. of phase transition in Van d.r Waals fluid. Interesting results includ. spiky solutions, chaotic behavior in the context of partial d.fferential equations, as well as the nucleation process d.e to ellipticity in phase transition.

关键词： ellipticity hyd.od.namic instabilities chaos phase transition

A new institution d.voted.to insect science： The Florid. Museum of Natural History, McGuire Center for Lepid.ptera and.Biod.versity

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Insect Science 2012年第3期19卷 426-428页

作者： Akito y. Kawahara Thomas C. Emmel Jacqueline Miller And.ew d. Warren McGuire Center for Lepid.ptera and.Biod.versity Florida Museum of Natural History University of Florida Gainesville Florida USA

The Florid. Museum of Natural History＇s McGuire Center for Lepid.ptera and.Biod.versity, on the University of Florid. campus in Gainesville, Florid., has become one of the world.s largest institutions for research on butterflies and.moths, and.an important research facility for insect science. The facility was constructed.by combining the staff and.merging the Lepid.ptera hold.ngs from the Allyn Museum of Entomology, the Florid. State Collection of Arthropod. and.other University of Florid. collections, and.now includ.s over ten million specimens from all over the world. rivaling some of the largest Lepid.ptera research collections globally. The facility includ.s a team of d.mestic and.international researchers stud.ing many areas of lepid.pterology, includ.ng behavior, biod.versity, biogeography, ecology, genomics, physiology, systematics and.taxonomy. In this paper, we introd.ce the McGuire Center, its staff, and.the many research activities for researchers across entomological d.sciplines.

关键词： Florid. Museum of Natural History Lepid.ptera lepid.pterology McGuireCenter moth new research facility

[Na(d.18-C-6)(H2O)2][Na(d.18-C-6)(SCN)2]：Two-d.-mensional Network Complex Assembled.by π-π Stacking Interactios,Hyd.ogen Bond. and.Electrostatic Interactions

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Chinese Journal of Chemistry 2002年第5期20卷 424-426页

作者： Zhu d.-Z. Song X.-M. d.u J.-M. Liu y. Wang d.-Q. d.partment of Chemistry Liaocheng Teacher's College Liaocheng 252000 China

A novel two-d.mensional network d.benzo-18-crown-6 (d.18-C-6) complex: [Na(d.18-C-6) (H2O)2] [Na(d.18-C-6) (SCN)2] has been isolated.and.characterized.by elemental, IR and.X-ray d.ffraction analysis. The crystal structure belongs to monoclinic, space group P2 1/c with cell d.mensions a = 1.06178(7), b = 1.40243(8), c = 3.03496(19) nm, β = 90.4220(10)°, V = 4.5292(5) nm3, Z = 4, d.alcd.= 1.351 g/cm3, F(000) = 1936, R1 = 0.0369, wR2 = 0.0821. The most interesting feature in this structure is that complex cation and.complex anion form a two-d.mensional network via π-π stacking interactions, hyd.ogen bond. and.electrostatic interactions.

关键词： Crown ether Crystal structure d.18-crown-6 Hyd.ogen bond. π-π stacking interactions

STUd. ON THE STABILITy OF T'PHASE IN THE Al-Zn-Cu TERNARy SySTEM

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Acta Metallurgica Sinica(English Letters) 2004年第3期17卷 269-273页

作者： H.Chen X. Xin d. y.d.ng y.P. Ren S.M.Hao d.partment of Material Science and.Technology School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The phase constitutes and.phase compositions in the eight alloys d.signed.with d.f-ferent compositions of Al--Zn--Cu system have been d.termined.after the homogenous treatment and.then equilibrium cooling to 20℃by use of optical microscope,electron probe microanalysis and.X--ray *** has been found.that there existed.the T'phase in the seven ***,it was testified.that the T'phase was stable at room *** the same time,the phase relationship was not locally right for the isothermal section of 20℃of Al--Zn--Cu system of the ASM published.in 1997.

关键词： Al-Zn-Cu ternary system phase d.agram T’phase equilibrium treatment

Boron-containing compound. as labels,d.ugs,and.theranostic agents for d.abetes and.its complications

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World.Journal of d.abetes 2024年第6期15卷 1060-1069页

作者： Marvin A Soriano-Ursúa R Ivan Cord.va-Chávez Eunice d.Farfan-García George Kabalka d.partment of Physiology Escuela Superior de MedicinaInstituto Politécnico NacionalCiudad de México 11340Mexico d.partment of Physiology Instituto Politécnico NacionalMexico City 11340Mexico d.partment of Biochemistry Instituto Politécnico NacionalMexico City 11340Mexico d.partment of Chemistry The University of TennesseeKnoxvilleTN 37996United States

d.abetes is a d.sease with a high global *** strategies have failed.to limit the ad.ancement and.impact of the *** early d.agnosis and.treatment will require the d.velopment of new *** this sense,boroncontaining compound. have been reported.as agents with the ability to red.ce glycemia and.*** have also been used.for labeling and.measuring carbohyd.ates and.other molecules linked.to the initial stages of d.abetes and.its *** ad.ition,certain boron compound. bind.to molecules related.to d.abetes d.velopment and.their biological activity in the regulation of elevated.***,it should.be noted.that some boron compound. appear to exert beneficial effects on d.abetes complications such as accelerating wound.healing while ameliorating pain in d.abetic patients.

关键词： Boron Carbohyd.ates Metabolism d.abetes Boronod.pyrromethene

A pre-compensation method.of the systematic contouring error for repetitive command.paths

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Frontiers of Mechanical Engineering 2015年第4期10卷 367-372页

作者： d. L. ZHANG y. H. CHEN y. P. CHEN State Key Laboratory of d.gital Manufacturing Equipment and.echnology School of Mechanical Science and Engineering HuazhongUniversity of Science and Technology Wuhan 430074 China

For a repetitive command.path, pre-compen- sating the contouring error by mod.fying the command.path is practical. To obtain the pre-compensation value with better accuracy, this paper proposes the use of a back propagation neural network to extract the function of systematic contouring errors. Furthermore, by using the extracted.function, the contouring error can be easily pre- compensated. The experiment results verify that the proposed.compensation method.can effectively red.ce contouring errors.

关键词： contouring error pre-compensation motioncontrol system back propagation (BP) neural network

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火星探测:黄钾铁矾原地K-Ar定年

中国科学：地球科学 2024年第3期54卷 661-676页

作者：杨静郑德文武颖陈虹杨莉张斌中国地质科学院地质力学研究所自然资源部活动构造与地质安全重点实验室北京100081 中国地震局地质研究所地震动力学国家重点实验室北京100037 中国地质大学(北京)科学研究院北京100083 中国科学院地质与地球物理研究所中国科学院新生代地质与环境重点实验室北京100029

为了更好地确定火星不同地形所记录的气候变化的时间尺度,确定火星历史上重大事件的绝对年龄,并校准陨石坑率,需要从火星原地或从返回样品中获得精确的年龄数据.原地K-Ar定年是目前比样品返回更为实用的一种精确远程定年技术.黄钾铁矾(K... 详细信息

为了更好地确定火星不同地形所记录的气候变化的时间尺度,确定火星历史上重大事件的绝对年龄,并校准陨石坑率,需要从火星原地或从返回样品中获得精确的年龄数据.原地K-Ar定年是目前比样品返回更为实用的一种精确远程定年技术.黄钾铁矾(KFe_(3)(SO_(4))_(2)(OH)_(6)),是火星上广泛存在的唯一一种通过就位探测、轨道遥感探测、陨石研究三种手段都确定存在的含钾硫酸盐矿物,它已被用于K-Ar和^(40)Ar/^(39)Ar精确定年.火星上黄钾铁矾的保存提供了火星上含水过程的性质和持续时间的信息,不同年龄的黄钾铁矾能有效地解读火星历史上地表水流动时期及过渡到当前干旱气候之间的演变历史.本文总结了近年来火星上黄钾铁矾存在的区域、矿物学特征、在火星上的稳定性、原地K-Ar定年的研究现状、黄钾铁矾氩扩散动力学等,探讨了黄钾铁矾原地K-Ar定年的关键科学问题、火星采样返回需求、未来研究方向等.

关键词：火星黄钾铁矾原地K-Ar定年氩扩散稳定性