检索结果-南通市图书馆

Experimental study of the ultrasonic and mechanical properties of SRM under compressive loading

在线全文

cnki会议

学校读者我要写书评

暂无评论

Experimental study of the ultrasonic and mechanical properti...

中国科学院地质与地球物理研究所2015年度（第15届）...

作者： y.wang X.Li R.L.Hu S.D.Li J.y.wang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of Sciences School of Hydraulic Engineering Changsha University of Science and Technology

Experiments were conducted to investigate the relationship between the ultrasonic pulse velocity(UPV),transmission ratio(TR),attenuation coefficient(AC)and mechanical properties of soil and rock mixture(SRM)with different rock percentage,under uniaxial *** SRM specimens(50 mm diameter and100 mm height)with rock block percentage of 20,30,40,and 50%were produced to perform a series of Uniaxial Compressive Strength(UCS)*** ultrasonic wave was transmitted and received by a P-wave piezoelectric transducer(130 kHz)and the ultrasonic travel time and amplitude were recorded by an ultrasonic detector during the whole deformation process of *** the test results,the UPV decreased and AC increased with the increasing rock percentage for all specimens by ultrasonic inspection before UCS *** failure mechanism of all specimens showed splitting-sliding mixed pattern,macrocracks have a direction of 0-10°parallel or sub-parallel tonormal stress,and UCS decreased with increasing of rock *** addition,the UPV and TR have fluctuation growth trend with increasing of axial stress while the increment rate decreased *** statistical correlations between UPV and TR and axial stress are presented and ***,the relationship between ultrasonic parameters and axial stress for soil and rock specimens were also *** results confirm that the ultrasonic and mechanical properties of SRM are closely related to rock *** a special geomaterial,the mechanical properties of SRM are different from rock and soil;this can be further confirmed by ultrasonic tests.

关键词： Soil and rock mixture(SRM) Ultrasonic wave Mechanical properties Uniaxial compressive strength test

在线全文

cnki会议

学校读者我要写书评

暂无评论

将信息作为产品来管理

中国科技资源导刊 2009年第2期41卷 8-12,32页

作者： Richard y.wang 苏颖麻省理工学院美国马萨诸塞州坎布里奇02139 中国科学技术信息研究所北京100038

详细阐述了使用信息产品方法,或称IP(Information Product)法,提出将信息作为产品加以管理。文章对信息产品给出了正式严格的定义,提出将信息作为产品加以管理的一套原则和规定,并介绍了信息产品经理的作用。

关键词：信息质量信息产品案例研究数据信息管理

Rankings never really quantify contributions: A quantitative and qualitative study on universities and their libraries

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Library Science in China 2020年 117-126页

作者： Shelia X.WEI Ronda J.ZHANG Howell y.wang CAO Cong Fred y.yE International Joint Informatics Laboratory & Jiangsu Key Laboratory of Data Engineering and Knowledge Services School of Information Management Nanjing University Nottingham University Business School University of Nottingham

By comparing quantitative ranking with qualitative contributions, we reveal that academic assessment has to put real contributions ahead of quantitative indicators and that rankings have nothing to do with universities’ and their libraries’ true values. The greatness of a university lies in its impacts on the progress for human knowledge and the promotion for social development. Although ranking of universities by way of quantitative indicators can reflect some information, we should pay more attention to qualitative contributions.

关键词：

Synthesis of MnCo2O4 Nanocages for high-performance Supercapacitor

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Synthesis of MnCo2O4 Nanocages for high-performance Supercap...

第七届全国物理无机化学学术会议

作者： y.Dong L.Zang y.Xu y.wang L.Jiao H.yuan College of Chemistry Institute of Applied Chemistry Nankai University

Recently,with the fossil-fuel crisis and ever-increasing demand for renewable energy,supercapacitor has attracted considerable interest due to its series advantages,such as high power density,long life span,and fast charge-discharge speed.1,2 Many transition metal oxides have been investigated as electrode materials for supercapacitor.3,4 Among all the explored materials,cobaltite(MnCoO)has been

关键词：

Investigations of nuclear chirality at iThemba LABS

在线全文

cnki会议

学校读者我要写书评

暂无评论

Frontiers of physics 2024年第2期19卷 7-38页

作者： R.A.Bark E.A.Lawrie C.Liu S.y.wang iThemba Laboratory for Accelerator Based Sciences National Research FoundationP.O.Box 722Somerset-West 7129South Africa Department of Physics University of the Western CapePrivate Bag X177535BellvilleSouth Africa Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai 264209China

Progress in the studies of chirality in atomic nuclei at iThemba LABS is *** regions of chirality,around mass 80 and 190 have been discovered using the AFRODITE array,specifically in the nuclei^(74)As,^(78,80,82)Br,^(81)Kr,and^(193,194,198)*** phenomena have been observed,including multiple chiral bands in the same nucleus,the coexistence of octupole correlations and nuclear chirality,and the coexistence of pseudo spin and nuclear *** best example of chiral degeneracy to date was found in ^(194)*** level scheme of ^(106)Ag has been revisited and interpreted in terms of two-and four-quasiparticle *** using the particle-rotor model have shown that the fingerprints of chirality in the two-quasiparticle system only can occur in an idealised model *** systems with a higher number of quasiparticles,the calculations showed that nuclear chirality can persist.

关键词： chirality high-spin states particle-rotor model

Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第4期9卷 54-67页

作者： Q.K.Liu L.Deng Q.wang X.Zhang F.Q.Meng y.P.wang y.Q.Gao H.B.Cai S.P.Zhu Graduate School China Academy of Engineering PhysicsBeijing 100088China Institute of Applied Physics and Computational Mathematics Beijing 100094China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Shanghai Institute of Laser Plasma Shanghai 201800China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China School of Physics Zhejiang UniversityHangzhou 310027China

We examine electron kinetic effects in broadband-laser-driven back-stimulated Raman scattering(BSRS)bursts using particle-in-cell *** bursts occur during the nonlinear stage,causing reflectivity spikes and generating large numbers of hot ***-duration simulations are performed to observe burst events,and a simplified model is developed to eliminate the interference of the broadband laser’s random intensity *** the simplified model,we isolate and characterize the spectrum of electron plasma *** spectrum changes from a sideband structure to a turbulence-like structure during the burst.A significant asymmetry in the spectrum is *** asymmetry is amplified and transferred to electron phase space by high-intensity broadband laser pulses,leading to violent vortex-merging and generation of hot *** proportion of hot electrons increases from 6.76%to 14.7%during a single violent burst *** demonstrate that kinetic effects profoundly influence the BSRS evolution driven by broadband lasers.

关键词： scattering kinetic simplified

Chinese herbal medicine as new treatment for postmenopausal osteoporosis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese herbal medicine as new treatment for postmenopausal ...

第9届中国中西医结合学会妇产科专业委员会第二次学术会议

作者： J.Lin T.Lv y.wang M.-y.wang W.Tang H.-J.Gober X.-M.Qiu D.-J.Li L.wang Laboratory for Reproductive Immunology Hospital & Institute of Obstetrics and Gynecology IBS Shanghai Medical College Fudan University Shanghai Key Laboratory of Female Reproductive Endocrine-related Diseases The Academy of Integrative Medicine of Fudan University Department of Surgery Graduate School of Medicine the University of Tokyo Department of Pharmacy Kepler University Clinic Neuromed Campus

背景:目前,中医药在绝经后骨质疏松症治疗中的作用尚不明确。目的:本文旨在总结近年来中医药在绝经后骨质疏松症中的应用。方法:采用多个数据库和相关关键词进行系统的文献检索,纳入应用中医药治疗绝经后骨质疏松症的体内和体外研究,获... 详细信息

背景:目前,中医药在绝经后骨质疏松症治疗中的作用尚不明确。目的:本文旨在总结近年来中医药在绝经后骨质疏松症中的应用。方法:采用多个数据库和相关关键词进行系统的文献检索,纳入应用中医药治疗绝经后骨质疏松症的体内和体外研究,获取全文。对文献进行统计学分析,选出最常用的中药,进一步评价所有纳入的研究的质量并提取相关数据。结果:纳入495篇符合条件的文献,筛选出最常用的中药。由于纳入的研究存在异质性,因此定性描述结果。结论:体内和体外研究均表明中医药在治疗绝经后骨质疏松症中具有潜在的应用价值。本结论的进一步证实还需要有足够样本量和随访时间、适当的控制变量和最佳盲法的临床试验。

关键词： Traditional Chinese medicine (TCM)·Chinese herbal medicine·Treatment·Postmenopausal osteoporosis

Research on integral mechanical thermal expansion forming process of heavy duty vehicle rear axle housing

在线全文

cnki会议

学校读者我要写书评

暂无评论

Research on integral mechanical thermal expansion forming pr...

The 2015 International Conference on Advanced Materials and Engineering Structural Technology(ICAMEST 2015)

作者： D.N.yu y.wang C.D.Su J.M.Liu State Key Lab of Automobile Simulation and Control Jilin University

This thesis firstly put forward the integral mechanical thermal expansion forming process during the heavy duty vehicle rear axle *** blank tube pretreatment,preliminary expansion forming,radial expansion forming,axial shaping and so *** advanced forming technology do not use the traditional technology forming process which need triangle panel to weld after the *** the technology,we achieved the goals that material savings,improve efficiency and reducing the *** is significant in heavy duty vehicle rear axle housing actual production guidance.

关键词：

Optimization of chemistry and process parameters for control of intermetallic formation in Mg sludges

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第4期12卷 1431-1448页

作者： y.Fu G.G.wang A.Hu y.Li K.B.Thacker J.P.Weiler H.Hu Department of Mechanical Automotive and Materials EngineeringUniversity of Windsor401 Sunset AveWindsorOntario N9B 3P4Canada Global Technology Centre Meridian Lightweight Technologies25 MacNab AveStrathroyOntario N7G 4H6Canada

Intermetallic formation in sludge during magnesium(Mg)melting,holding and high pressure die casting practices is a very important ***,very often it is overlooked by academia,original equipment manufacturers(OEM),metal ingot producers and even die *** aim of this study was to minimize the intermetallic formation in Mg sludge via the optimization of the chemistry and process *** Al8Mn5 intermetallic particles were identified by the microstructure analysis based on the Al and Mn *** design of experiment(DOE)technique,Taguchi method,was employed to minimize the intermetallic formation in the sludge of Mg alloys with various chemical compositions of Al,Mn,Fe,and different process parameters,holding temperature and holding *** sludge yield(Sy)and intermetallic size(IS)was selected as two *** optimum combination of the levels in terms of minimizing the intermetallic formation were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,690℃ for the holding temperature and holding at 30 mins for the holding time,*** best combination for smallest intermetallic size were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,630℃ for the holding temperature and holding at 60 mins for the holding time,*** groups of sludge factors,Chemical Sludge(CSF),Physical Sludge(PSF)and Comprehensive Sludge Factors(and CPSF)were established for prediction of sludge yields and intermetallic sizes in Al-containing Mg *** CPSF with five independent variables including both chemical elements and process parameters gave high accuracy in prediction,as the prediction of the PSF with only the two processing parameters of the melt holding temperature and time showed a relatively large deviation from the experimental *** Chemical Sludge Factor was primarily designed for small ingot producers and die casters with a limited melting and holding capacity,of which process parameters could be fixed *** Physical Sludge Factor could be used f

关键词： Magnesium sludge Al-Mn intermetallic Optimization Taguchi method Sludge factor Chemical composition Process parameter