检索结果-南通市图书馆

Acta Metallurgica Sinica(English letters) 2018年第12期31卷 1361-1367页

作者： Y.h.zhu C.M.luk Department of Industrial and Systems Engineering TheHong Kong Polytechnic UniversityHong KongChina Department of Applied Physics The Hong Kong PolytechnicUniversityHong KongChina

Electropulsing-induced phase decompositions and microstructural changes in AZO-5 thin films were studied by X-raydiffraction, scanning electron microscopy, atomic force microscopy, hall effect measurement and photoluminescence （Pl）measurement techniques. It was found that the electropulsing induced phase decomposition started with spinodaldecomposition, which was accompanied by discontinuous precipitation in the AZO-5 thin films. Both circular phasedecompositions and the crystal orientation occurred. Inappropriate electropulsing might damage zones, which resulted intremendous decrease in electrical conductivity. Circular changes in both the peak position and the width of the Plwavelength were observed in the EPT AZO-5 thin films. Formation of zones favored reducing the roughness of the thinfilm.

关键词： Electropulsing Phase transformation Electrical conductivity Photoluminescence Thin-films AZO

Comparing Ordinary Kriging and Regression Kriging for Soil Properties in Contrasting landscapes

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2010年第5期20卷 594-606页

作者： Q.zhu h.S.lIN Department of Crop and Soil Sciences 116 ASI BuildingThe Pennsylvania State UniversityUniversity ParkPA 16802(USA)

The accuracy between ordinary kriging and regression kriging was compared based on the combined consideration of sample size,spatial structure,and auxiliary variables(terrain indices and electromagnetic induction surveys) for a variety of soil properties in two contrasting landscapes(agricultural ***).When spatial structure could not be well captured by point-based observations(e.g.,when the ratio of sample spacing over correlation range was > 0.5),or when a strong relationship existed between target soil properties and auxiliary variables(e.g.,their R2 was > 0.6),regression kriging(RK) was more accurate for interpolating soil properties in both landscapes ***,ordinary kriging(OK) was *** depth and wetness condition did not appear to affect the selection of kriging for soil moisture interpolation,because they did not significantly change the ratio of sample spacing over correlation range and the relationship with the auxiliary *** of a smaller ratio of elevation change over total study area(E/A = 1.2) and multiple parent materials in the agricultural land,OK was generally more accurate in that *** contrast,a larger E/A ratio of 6.8 and a single parent material led to RK being preferable in the steep-sloped forested *** results from this study can be useful for selecting kriging for various soil properties and landscapes.

关键词： geostatistics soil moisture spatial interpolation spatial structure

Stochastic averaging of quasi integrable and resonant hamiltonian systems excited by fractional Gaussian noise with hurst index 1/2<h<1

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2017年第1期30卷 11-19页

作者： Q.F.lü M.l.Deng W.Q.zhu Department of Mechanics State Key Laboratory of Fluid Power and Mechatronic SystemsKey Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang University

A stochastic averaging method of quasi integrable and resonant hamiltonian systems under excitation of fractional Gaussian noise （fGn） with the hurst index 1/2 〈 h 〈 1 is proposed. First, the definition and the basic property of fGn and related fractional Brownian motion （iBm） are briefly introduced. Then, the averaged fractional stochastic differential equations （SDEs） for the first integrals and combinations of angle variables of the associated hamiltonian systems are derived. The stationary probability density and statistics of the original systems are then obtained approximately by simulating the averaged SDEs numerically. An example is worked out to illustrate the proposed stochastic averaging method. It is shown that the results obtained by using the proposed stochastic averaging method and those from digital simulation of original system agree well.

关键词： Quasi integrable and resonant hamiltonian system Fractional Brownian motion Fractional Gaussian noise Stochastic averaging method Internal resonant

Preliminary Study of a hybrid helicon-ECR Plasma Source

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2016年第8期18卷 832-836页

作者： A.M.hAlA l.OKSUZ zhu Ximing The National Center for Applied Physics Material Science Research InstituteKing Abdul Aziz City for Science and Technology(KACST) Süleyman Demirel University Science and Literature FacultyPhysics Department Institute for Plasma and Atomic Physics Ruhr University

A new type of hybrid discharge is experimentally investigated in this work. A helicon source and an electron cyclotron resonance（ECR） source were combined to produce plasma. As a preliminary study of this type of plasma, the optical emission spectroscopy（OES） method was used to obtain values of electron temperature and density under a series of typical conditions. Generally,it was observed that the electron temperature decreases and the electron density increases as the pressure increased. When increasing the applied power at a certain pressure, the average electron density at certain positions in the discharge does not increase significantly possibly due to the high degree of neutral depletion. Electron temperature increased with power in the hybrid *** mechanisms of these preliminary observations are discussed.

关键词： helicon plasma ECR hybrid discharge

Water solubility enhancements of pyrene by single and mixed surfactant solutions

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2001年第4期13卷 491-496页

作者： zhu, l.-z. Chiou, C.T. Department of Environmental Science Zhejiang University Hangzhou 310028 China

Water solubility enhancements of pyrene by both single-surfactant and mixed-surfactant solutions were compared and evaluated. The solubility of pyrene in water was greatly enhanced by each of Triton X-100 (TX100), Triton X-405 (TX405), Brij 35 and SDS, in which the water solubility enhancements increased with increasing surfactant concentrations. The extent of solubility enhancements at surfactant concentrations below. the CMC is the order of TX100 > Brij 35 > TX405 > SDS; the sequence at surfactant concentrations above the CMC is TX100 > Brij 35 > SDS > TX405. Pyrene was solubilized synergistically by anionic-nonionic mixed surfactant solutions, especially at low surfactant concentrations. The synergistic power of the mixed surfactants is SDS-TX405 > SDS-Brij 35 > SDS-TX100. The synergism as noted is attributed to increasing Kmc and/or decreasing the CMC of the mixed surfactant solution. For SDS-TX405 and SDS-Brij 35 mixed surfactant solutions, an increase in Kmc is coupled with a decrease in the CMC; for SDS-TX100, only a decreased in the CMC value is noted. Mixed-surfactant solutions may improve the performance of the surfactant-enhanced remediation (SER) of soils by increasing the bioavailability and biodegradation of non-aqueous-phase organic pollutants and reducing the level of surfactant pollution and remediation expenses.

关键词： Biodegradation Concentration (process) Solubility Water

Improving the performance of structure-embedded acoustic lenses via gradient-index local inhomogeneities

在线全文

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2015年第1期6卷 1-13页

作者： h.zhu F.Semperlotti Department of Aerospace and Mechanical Engineering University of Notre DameNotre DameIndiana 46556USA

We investigate the use of graded inhomogeneities in order to enhance the focusing and collimation performance of structure-embedded acoustic metamaterial *** type of inhomogeneity exploited in this study consists in axial symmetric exponential-like gradients of either material or geometric properties that create gradient-index inclusions able to bend and redirect propagating *** particular,we exploit the concept of gradient index inclusions to achieve focusing and collimation of ultrasonic beams created by embedded drop-channel lenses in both bulk and thin-walled *** the latter,the implementation is possible thanks to geometric exponential tapers known as Acoustic Black holes(ABh).ABh tapers allow accurate control of the characteristics of the acoustic beam emanating from the lens channel which in the conventional design is severely affected by *** concept of beam control via graded inclusions is numerically illustrated and validated by using a combination of methodologies including geometric acoustics,finite difference time domain,and finite element methods.

关键词： acoustic lens acoustic black hole gradient index inhomogeneity drop-channel acoustic metamaterials

Jiang Shuqin:A Devoted Family Planning Worker

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

China Population Today 1997年第2期14卷 4-5页

作者： h zhu

Farmers were not well in formed about contraception and their popula tion awareness was insufficient in the 1970s when the national family plan-ning programme was first introduced.

关键词： Worker Family

Family　Planning　Associations　Vital　To　Supervision　of　Programme　Implementation

在线全文

学校读者我要写书评

暂无评论

China Population Today 1996年第3期13卷 14-15页

作者： h zhu

ＦａｍｉｌｙＰｌａｎｎｉｎｇＡｓｓｏｃｉａｔｉｏｎｓＶｉｔａｌｔｏＳｕｐｅｒｖｉｓｉｏｎｏｆＰｒｏｇｒａｍｍｅＩｍｐｌｅｍｅｎｔａｔｉｏｎ￥／／ＴｈｅＦａｍｉｌｙＰｌａｎｎｉｎｇＡｓｓｏｃｉａｔｉｏｎ（ＦＰＡ）ｏｆＳ... 详细信息

ＦａｍｉｌｙＰｌａｎｎｉｎｇＡｓｓｏｃｉａｔｉｏｎｓＶｉｔａｌｔｏＳｕｐｅｒｖｉｓｉｏｎｏｆＰｒｏｇｒａｍｍｅＩｍｐｌｅｍｅｎｔａｔｉｏｎ￥／／ＴｈｅＦａｍｉｌｙＰｌａｎｎｉｎｇＡｓｓｏｃｉａｔｉｏｎ（ＦＰＡ）ｏｆＳｈｕｉｌｉａｎｙｕＴｏｗｎｓｈｉｐ...

关键词： Program

Bifunctional bridging capping layer enables 24.5% efficiency of perovskite solar cells with polymer-based hole transport materials

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期 350-359页

作者： Can zhu Yiyang Wang lei Meng Beibei Qiu Jing li Shucheng Qin Ke hu Xin Jiang Wenbin lai Minchao liu Zhe liu Chenxing lu Jinyuan Zhang Yongfang li Beijing National laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences School of Chemical Science University of Chinese Academy of Sciences Key laboratory of Solid State Optoelectronic Devices of Zhejiang Province College of Physics and Electronic Information Engineering Zhejiang Normal University Key laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of Sciences laboratory of Advanced Optoelectronic Materials College of Chemistry Chemical Engineering and Materials ScienceSoochow University

Developing a bridge capping layer between perovskite and hole transport layer materials（hTMs） in the n-i-p perovskite solar cells（pero-SCs） is an effective approach to modify the morphology of hTMs and passivate the perovskite ***, we select the quinoxaline-based bifunctional passivation agent, quinoxalin-6-yl-methylamine hydrochloride（Qx MACl）,as the bridging layer, and a D-A copolymer PBQ12 containing the same quinoxaline unit as an hTM for the n-i-p pero-SCs. Due to the π-π stacking among the common quinoxaline units in the bridge layer and hTM, Qx MACl induces the π-π stacking of the PBQ12 film and improves the film morphology of hTMs with better conductivity. Additionally, Qx MACl can effectively passivate the perovskite surface, and PBQ12 possesses appropriate energy levels and high hole mobility. The pero-SCs based on FAPbI3with PBQ12/Qx MACl treatment showed a higher power conversion efficiency（PCE） of 24.05% and outstanding stability, maintaining 95.4% and 92.1% of its initial PCE after 750 h of storage and after over 800 h of thermal annealing at 85 °C, respectively. To further enhance the PCE of the PBQ12/Qx MACl-based devices, we developed a non-metal ion dopant for the PBQ12 hTM. Through trace doping of PBQ12 hTM by the non-metal ion dopant, the PCE of the PBQ12/Qx MACl-based devices reached 25.24%（the calibrated PCE of 24.55% by the National Institute of Metrology, China）.

关键词：

同方期刊数据库

AN INVESTIGATION ON ASYMPTOTIC NEAR-TIP FIElDS OF DYNAMIC CRACK IN AN ElASTIC-PERFECTlY PlASTIC COMPRESSIBlE MATERIAl

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 1997年第3期10卷 198-211页

作者： zhu, XK hwang, KC Zhang, l TSING hUA UNIV DEPT HYDRAUL ENGNBEIJING 100084PEOPLES R CHINA TSING hUA UNIV DEPT ENGN MECHBEIJING 100084PEOPLES R CHINA

The stress and deformation fields near the tip of a mode-I dynamic crack steadily propagating in an elastic-perfectly plastic compressible material are considered under plane strain conditions. Within the framework of infinitesimal displacement gradient theory, the material is characterized by the Von Mises yield criterion and the associated J(2) flow theory of plasticity. Through rigorous mathematical analysis, this paper eliminates the possibilities of elastic unloading and continuous asymptotic fields with singular deformation, and then constructs a fully continuous and bounded asymptotic stress and strain field. It is found that in this solution there exists a parameter phi(0) which cannot be determined by asymptotic analysis but may characterize the effect of the far field. lastly the variations of continuous stresses, velocities and strains around the crack tip are given numerically for different values of phi(0).

关键词： plane strain elastic perfectly plastic material compressibility mode-I crack dynamic propagation asymptotic field