检索结果-南通市图书馆

Effect of contact materials on the transient characteristics of vacuum arc plasma and anode erosion

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2024年第11期26卷 170-180页

作者： ze yang Dongsheng CAI Qi HUANG Lijun WANG College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059People’s Republic of China Postdoctoral Mobile Station in Nuclear Science and Technology Chengdu University of TechnologyChengdu 610059People’s Republic of China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

In this study, the mechanisms of the anode phenomena and anode erosion with various contact materials were investigated. Arc parameters were calculated, and the anode temperature was predicted with a transient self-consistent model. The simulation results predicted a constricted arc column and obvious anode phenomena in Cu–Cr alloy contacts than in W–Cu alloy *** observation could be the reason for the concentrated anode erosion in Cu–Cr alloys. For the contacts made by pure tungsten(W) and W–Cu alloy, the anode temperature increased rapidly because of the low specific heat of W. However, the maximum energy flux from the arc column to the anode surface was lower than in other cases. The simulation results were compared with experimental results.

关键词： vacuum arc MHD model anode erosion contact materials

Orbital responses to methyl sites in C_nH_(2n+2) (n=1-6)

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第2期21卷 16-22页

作者： yang ze-Jin Cheng Xin-Lu Zhu Zhen-He yang Xiang-Dong School of Science Zhejiang University of TechnologyHangzhou 310023China Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China

Orbital responses to methyl sites in CnH2n＋2 （n = 1-6） are studied by B3LYP/TZVP based on the most stable geometries using the B3LYP/aug-cc-pVTZ method. Vertical ionization energies are produced using the SAOP/et-pVQZ model for the complete valence space. The highest occupied molecular orbital （HOMO） investigations indicate the p- electron profiles in methane, ethane, propane, and n-butane. By increasing the number of carbon-carbon bonds in lower momentum regions, the s, p-hybridized orbitals are built and display strong exchange and correlation interactions in lower momentum space （P 〈 0.50 a.u.）. Meanwhile, the relative intensities of the isomers in lower momentum space show the strong bonding number dependence of the carbon-carbon bonds, meaning that more electrons have contributed to orbital construction. The study of representative valence orbital momentum distribution further confirms that the structural changes lead to evident electronic rearrangement over the whole valence space. An analysis based on the isomers reveals that the valence orbitals are isomer-dependent and the valence ionization energy experiences an apparent shift in the inner valence space. However, such shifts are greatly reduced in the outer valence space. Meanwhile, the opposite energy shift trend is found in the intermediate valence space.

关键词： electron momentum spectroscopy valence ionization energy charge density distribution

Study of Water Movement in Unsaturated Copper Ore

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第4期17卷 516-520页

作者： LI Xun yang ze-ping ZHENG Zhi-hong College of Engineering and Architecture Zhefiang University Hangzhou Zhejiang 310027 China East China Institute of Technology Fuzhou Jiangxi 344000 China

Leaching is widely applied in the exploitation of depleted ores. In order to discover the law of leachant movement in the leaching process and calculating volumes and time intervals of spraying leachant,experiments and numerical simulation with the TOUGH2/EOS3 module were carried out in order to find out the principle of water movement in unsaturated copper ore. The results show that water volume increases at the same location over time,that copper ore tends to become saturated and that liquid velocity decreases at the same time as the distance from top in-creases. On the other hand,a comparison and analysis of our experimental and simulated results indicate that the EOS3 module could accurately simulate the water movement in an unsaturated state.

关键词： unsaturated copper ore volumetric water content liquid velocity simulation

Inversion analysis of the shear strength parameters for a high loess slope in the limit state

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2021年第1期18卷 252-264页

作者： LIN Xiao-yan ZHANG Lin-fan yang ze LI Ping LI Tong-lu School of Earth Sciences and Engineering Xi'an Shiyou UniversityXi'an 710065China Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi'an Shiyou UniversityXi'an 710065China School of Geological Engineering and Surveying Chang'an UniversityXi'an 710061China

It is difficult to obtain reliable shear strength parameters for the stability analysis and evaluation of high loess ***,this paper determines slope elements and physical parameter of 79 slopes with heights of[40,120]m based on the measured loess slopes in the Ganquan and Tonghuang subregions of northern Shaanxi Province,*** the limit state of the loess slope(stability factor Fs is 1.0),a fitting equation for the slope height and width is ***,the model is developed by stability analysis software-SLOPE/W,and the comprehensive shear strength parameters corresponding to different slope heights of the high slope in the study area are obtained by inversion using the Morgenstern-Price *** results show that when the height of the slope increases,the cohesion c increases in the soil,and the internal friction angle j *** change is consistent with the characteristics reflected in the composition and physical properties of the slopes,and the comprehensive strength parametric curves are very similar between the Ganquan subregion and the Tonghuang subregion.A landslide that occurred in Miaodian-zaitou of Jingyang County,Shaanxi Province,is selected to verify this inversion method,and the results show that the calculated shear strength parameters of the inversion are consistent with the measured value of the actual slope.

关键词： Loess High slope Shear strength Inversion SLOPE/W

High-Power-Density Plasma Deposition of Diamond-Like Carbons Films

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1994年第9期11卷 558-560页

作者： YAN Pengxun yang Si-ze yang Jie LI Qing LI Bing LIU Chizi CHEN Xishen Institute of Physics Academia SinicaBeijing 100080

We present a new method utilizing a high-power-density plasma for depositing diamond-like carbon(DLC)*** main advantage of this technique is the possibility that films with good adhesion to the substrate can be prepared under room temperature and low *** DLC films are deposited on the silicon substrate *** structure of the DLC films was characterized by high energy electron diffraction,scanning electron microscopy,Raman spectroscopy,x-ray photoelectron spectroscopy,and infrared absorption spectrum.

关键词： films utilizing DLC

lassification and existence of positive entire k-convex radial solutions for generalized nonlinear k-Hessian system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2021年第4期36卷 564-582页

作者： ZHANG Li-hong yang ze-dong WANG Guo-tao Mohammad M.Rashidi School of Mathematics and Computer Science Shanxi Normal UniversityLinfen 041004China Shanghai Automotive Wind Tunnel Center Tongji UniversityShanghai 201804China

In this paper,we consider the following generalized nonlinear k-Hessian system G(S_(k)^(1/k)(λ(D^(2)z1)))S_(k)^(1/k)(λ(D^(2)z1))=φ(|x|,z1,z2),x∈R^(N),G(S_(k)^(1/k)(λ(D^(2)z2)))S_(k)^(1/k)(λ(D^(2)z2))=ψ(|x|,z1,z2),x∈R^(N),where G is a nonlinear operator and Sk(λ(D^(2)z))stands for the k-Hessian *** first are interested in the classification of positive entire k-convex radial solutions for the k-Hessian system ifφ(|x|,z1,z2)=b(|x|)φ(z1,z2)andψ(|x|,z1,z2)=h(|x|)ψ(z1).Moreover,with the help of the monotone iterative method,some new existence results on the positive entire k-convex radial solutions of the k-Hessian system with the special non-linearitiesψ,φare given,which improve and extend many previous works.

关键词： k-Hessian system entire blow-up classification of radial solutions monotone iterative method

Transparent perovskite glass-ceramics for visual optical thermometry

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第6期39卷 712-717,I0004页

作者： Qihua yang Lei Zhao Zhaohui Fang ze yang Jiangyan Cao Yiyu Cai Dacheng Zhou Xue Yu Jianbei Qiu Xuhui Xu Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China School of Physics and Opto-Electronic Technology Baoji University of Arts and SciencesBaoji 721016China Key Laboratory of Advanced Materials of Yunnan Province Kunming 650093China

Optical thermometers have aroused considerable attention in recent years,and the increasing demand of sensitivity for practical application encourages the investigation on developing innovative non-contact optical thermo metric materials with higher sensitivity and *** quantum dots(QDs)with excellent temperature-dependence optical properties,provide a feasible approach to realizing the detection of temperature change,however,their poor high temperature thermal stability and the facile realization to obtain the production remain a daunting ***,growing Tb^(3+)-doped CsPbl_(3) QDs in situ in borosilicate glass is proposed,which ensures the phase stability,and high-efficiency florescence output of the all-inorganic perovskite as a temperature sensor.A higher absolute and relative temperature sensitivity(0.0398 K^(-1) and 7.12%/K,respectively),along with the visible color change from orange-red to yellow-green with the increase of temperature is ***,the repeatable florescence intensity of Tb^(3+)-doped CsPbl_(3) QDs under high temperature enables their temperature sensing application.

关键词： CsPbI_(3)quantum dots Thermometry Thermal stability Visual change Rare earths

662 A/G gene variation in human tumor necrosis factor receptor superfamily,member 9(TNFRSF9)

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2008年第3期2卷 283-285页

作者： Yanchun QU ze yang Liang SUN Linong JI Tianjin Institute of Urology The Second Hospital of Tianjin Medical UniversityTianjin 300211China Beijing Institute of Geriatrics Beijing HospitalMinistry of HealthBeijing 100730China Endocrinology Department The People’s HospitalBeijing UniversityBeijing 100044China

The aim of this paper is to report a new coding variance of the TNFRSF9 gene,a candidate for auto-immune *** found the variation in two families with type 2 diabetes mellitus by D-HPLC mutation screening method and confirmed our results by direct sequencing and *** without changing the amino acid coding,the variance may have an effect on codon usage and play a role in disease development,such as type 2 diabetes ***,we cannot define the role of this variance because the frequency of the minor allele is low in the Chinese population and no homozygote of the variance was *** research in multiple populations will be necessary to define the role of this variance.

关键词： diabetes mellitus single nucleotide polymorph-ism TNFRSF9 gene antigens,CD137 immune regulation

The preparation of whole sp-C composed alkyne rich carbon materials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第11期16卷 12618-12625页

作者： Deyi Zhang ze yang Wenjing Liu Xingru Yan Qin Liu Xiaodong Li Changshui Huang Yuliang Li Beijing National Laboratory for Molecular Sciences Organic Solids LaboratoryInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China

For the high content of sp-hybridized carbon atoms,carbyne based materials can express superior conductivity and ultra-high theoretical capacity,which are key factors of high-performance ***,the poor stability of synthetic intermediates and unwanted side reactions lead to huge challenge to synthesis carbyne alternating carbon–carbon triple and single ***,we rationally designed a smart“Greedy Snake”strategy to synthesize the alkyne rich carbon materials named Si capped alkyne rich carbon(Si-Alkyne-C)which comprised of sp-hybridized carbon *** as-prepared Si-Alkyne-C generated on the copper surface through a carbon–carbon coupling,in which Si can effectively protect the intermediates generated by the *** C–Si bond can constantly generate copper-alkyne intermediates to couple with other terminal alkynes to continuously elongate like"Greedy Snake",forming a long alkyne chain *** as-prepared Si-Alkyne-C can be applied as anode electrodes,exhibited very high reversible capacity of up to 2776 mAh/g at a current density of 50 mA/g and an average capacity around 1202 mAh/g at a high current density of 5000 mA/g for 5000 cycles,which are the best results among the reported carbon materials and better than many other anode *** results not only provide a facile strategy to prepare carbyne based materials,but also open a broad avenue for the preparation of high-capacity anode materials.

关键词： alkyne rich carbon materials sp-hybridized carbon anode material energy storage lithium storage