检索结果-南通市图书馆

ANALYSIS OF SOUND RADIATION FROM THE RING-STIFFENED CYLINDRICAL SHELL COATED WITH VISCOELASTIC LAYER IN FLUID MEDIUM

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2003年第2期16卷 155-161页

作者： Luo Dongping Cai Minbo Peng xu Luo Bin (department of Naval and Ocean Engineering,Huazhong university of Science and technology,Wuhan 430074,china) department of Naval Engineering Huazhong Univ. of Sci./Technology Wuhan 430074 China

The Donnell theory of shell is applied to describe shell motion and layer motion is described by means of three-dimensional Navier *** deformation harmonious condi- tions of the interface,the effects of stiffeners and layer are treated as reverse forces and moments acting on the cylindrical *** studying the acoustic field produced by vibration of the sub- merged ring-stiffened cylindrical coated shell,the structure dynamic equation,Helmholtz equation in the fluid field and the continuous conditions of the fluid-structure interface compose the cou- pling vibration equation of the *** extract of sound pressure comes down to the extract of coupling vibration *** use of the solution of the equation,the influ- ences of hydrostatic pressure,physical characters and geometric parameters of the layer on sound radiation are discussed.

关键词： viscoelastic layer ring-stiffened cylindrical coated shell coupling vibration equation sound radiation

Physically-based approach to analyze rainfall-triggered landslide using hydraulic gradient as slide direction

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang university-Science A(applied Physics & Engineering) 2012年第12期13卷 943-957页

作者： Qi-hua RAN1,Dan-yang SU1,Qun QIAN1,xu-dong FU2,Guang-qian WANG1,2,Zhi-guo HE3 (1department of Hydraulic Engineering,Zhejiang university,Hangzhou 310058,china) (2State Key Laboratory of Hydroscience and Engineering,Tsinghua university,beijing 100084,china) (3department of Ocean Science and Engineering,Zhejiang university,Hangzhou 310058,china) department of Hydraulic Engineering Zhejiang University Hangzhou China State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing China department of Ocean Science and Engineering Zhejiang University Hangzhou China

An infinite slope stability numerical model driven by the comprehensive physically-based integrated hydrology model(InHM) is *** this approach,the failure plane is assumed to be parallel to the hydraulic gradient instead of the slope *** method helps with irregularities in complex terrain since depressions and flat areas are allowed in the *** present model has been tested for two synthetic single slopes and a small catchment in the Mettman Ridge study area in Oregon,United States,to estimate the shallow landslide *** results show that the present approach can reduce the simulation error of hydrological factors caused by the rolling topography and depressions,and is capable of estimating spatial-temporal variations for landslide susceptibilities at simple slopes as well as at catchment scale,providing a valuable tool for the prediction of shallow landslides.

关键词： Shallow landslide Infinite slope stability model Hydraulic gradient Physically-based hydrology model Integrated hydrology model(InHM)

Normalized and self-normalized Cramér-type moderate deviations for the Euler-Maruyama scheme for the SDE

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2024年第8期67卷 1865-1880页

作者： Xiequan Fan Haijuan Hu Lihu xu Center for applied mathematics Tianjin UniversityTianjin 300072China School of mathematics and Statistics Northeastern University at QinhuangdaoQinhuangdao 066004China department of mathematics Faculty of Science and TechnologyUniversity of MacaoMacaoChina

In this paper,we establish normalized and self-normalized Cramér-type moderate deviations for the Euler-Maruyama scheme for *** to our results,Berry-Esseen's bounds and moderate deviation principles are also *** norm... 详细信息

关键词： Euler-Maruyama scheme Cramer-type moderate deviations self-normalized sequences Berry-Esseen’s bounds

SrGa_2S_4∶Ce blue TFEL in new structure

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第7期43卷 603-605页

作者： xu Chunxiang+1, LOU Zhidong+2, xu Zheng+3 and xu xurong+31. National Laboratory of Molecular and Biomolecular Electronics, Southeast university, Nanjing 210096, china 2. department of applied Physics, Tianjin university, Tianjin 300031, china 3. Institu National Laboratory of Molecular and Biomolecular Electronics Southeast University Nanjina China department of applied Physics Tianjin University Tianjin China Institute of Photoelectronic technology Northern Jiaotong University Beijing China

SrGa-2S-4∶Ce blue TFEL device with a novel structure was prepared by electron beam evaporation. The dielectric constant of insulator layer in this structure is far less than that in the conventional structure, so the hot-electrons can be accelerated in SiO-2 layers. The stable TFEL with good chromaticity was achieved and the basic characteristics were investigated.

关键词： SrGa-2S-4∶Ce bule TFEL low dielectric constant insulator layer.

Design of an automated robotic microinjection system for batch injection of zebrafish embryos and larvae

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2024年第1期10卷 89-103页

作者： Zhongyi Guo Nana Ai Wei Ge Qingsong xu department of Electromechanical Engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina department of Biomedical Sciences and Centre of Reproduction Development and Aging(CRDA)Faculty of Health SciencesUniversity of MacaoMacaoChina

This paper presents the design of a vision-based automated robotic microinjection system for batch injection of both zebrafish embryos and larvae.A novel visual recognition algorithm based on an automatic threshold and excessive dilatation is introduced to accurately identify the center of zebrafish embryos and larval yolks.A corresponding software system is developed using the producer-consumer model as the framework structure,and a friendly user interface is designed to allow operators to choose from a range of desired functions according to their different *** addition,a novel microstructural agarose device is designed and fabricated to simultaneously immobilize mixed batches of embryos and ***,a prototype microinjection system is fabricated by integrating hardware devices with visual *** experimental study is conducted to verify the performance of the robotic microinjection *** results show that the reported system can accurately identify zebrafish embryos and larvae and efficiently complete batch microinjection tasks of the mixtures with an injection success rate of 92.05%in 13.88 s per *** with manual and existing microinjection systems,the proposed system demonstrates the merits of versatility,excellent efficiency,high success rate,high survival rate,and sufficient stability.

关键词： zebra automated hardware

Amino acids modified nanoscale zero-valent iron:Density functional theory calculations,experimental synthesis and application in the Fenton-like degradation of organic solvents

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

Journal of Environmental Sciences 2024年第1期135卷 296-309页

作者： Xingchen Yang Fucheng Ming Jianlong Wang Lejin xu department of Nuclear Engineering and technology School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China china-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan 430074China Institute of Nuclear and New Energy technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China beijing Key Laboratory of Radioactive Wastes Treatment Tsinghua UniversityBeijing 100084China

To improve the adsorption and catalytic performance of heterogeneous Fenton-like catalysts for oil wastes,amino acids were used to modify nanoscale zero-valent iron(AA@Fe^(0)),which were applied in the Fenton-like degradation of organic solvents(tributyl phosphate and n-dodecane,named TBP and DD).Twelve amino acids,i.e.,glycine(Gly),alanine(Ala),leucine(Leu),proline(Pro),phenylalanine(Phe),methionine(Met),cysteine(Cys),asparagine(Asn),serine(Ser),glutamic acid(Glu),lysine(Lys)and arginine(Arg),were selected and calculated by density functional theory(DFT).The optimized structure,charge distribution,the highest occupied molecular orbital(HOMO),the lowest unoccupied molecular orbital(LUMO),interaction region indicator(IRI)isosurface map and adsorption energy of AA@Fe^(0),AA@Fe^(0)-TBP and AA@Fe^(0)-DD were studied,which indicated that Fe is more likely to approach and charge transfer with-COO and-NH_(3) on theα-carbon of amino *** is strong attraction between Fe and–COO,and Van der Waals force between Fe and-NH_(3),*** the interaction of AA@Fe^(0)with TBP and DD,Van der Waal force plays an important ***@Fe^(0)was synthesized in laboratory and characterized to investigate physicochemical *** Fenton-like degradation of organic solvents,the change of COD in water phase during the degradation process as well as the volume of the organic phase after the reaction were *** results of calculations combined with experiments showed that Ser-modified Fe^(0)performed the best in these amino acids,with 98%removal of organic solvents.A possible catalytic mechanism was proposed in which amino acids acted a linking role between Fe and organic solvents,activating H_(2)O_(2)to generate hydroxyl radicals for the degradation of organic solvents.

关键词： Amino acids Nanoscale zero-valent iron Density functional theory Organic solvents Fenton-like degradation

A COST-SHARING METHOD FOR AN UNCAPACITATED FACILITY LOCATION GAME WITH PENALTIES

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2012年第2期25卷 287-292页

作者： Zhen WANG dachuan xu department of applied mathematics Beijing University of Technology

This paper considers a variant of the classical facility location game called the uncapacitared facility location game with penalties （UFLGWP）. Unlike the standard UFLG, each client in the UFLGWP is either assigned to an open facility or rejected by paying a penalty. The authors propose a 3-approximate cross-monotonic cost-sharing method for the UFLGWP.

关键词： Cost-sharing method cross-monotonicity facility location game.

INFLUENCE OF COMPOSITIONAL HETEROGENEITY ON MORPHOLOGY AND PROPERTIES OF SEGMENTED COPOLYMERS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 1988年第1期6卷 64-74页

作者：胡世如徐懋张兴元马德柱罗筱烈 Institute of Chemistry Academia Sinica beijing department of applied Chemistry university of Science and technology of china Hefei

Polyethylene terephthalate(PET)/polycaprolactone(PCL) segmented copolymers with different hard segment contents and a blend of two of them were studied by using DSC, WAXS, TEM and IR techniques and dynamic mechanical, stress-strain and isothermal crystallization measurements. Emphasis was laid on the studies of influence of compositional heterogeneity on the morphology and properties of these segmented copolymers. It was found that the solution cast specimens of the more heterogeneous sample exhibit better segregation of segments, high crystallinity and melting temperature. They have higher thermal stability of mechanical properties at small deformations. However, they are less stable against large deformations and may become softer than the more homogeneous ones.

关键词： Segmented polyester eompositional heterogeneity morphology mechaical properties.

Dynamics Model of Carrier-based Aircraft Landing Gears Landed on Dynamic Deck

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2009年第4期22卷 371-379页

作者： Zhang Wen,Zhang Zhi,Zhu Qidan,xu Shiyue department of Automation,Harbin Engineering university,Harbin 150001,china department of Automation Harbin Engineering University Harbin 150001 China

In order to study the carrier-based aircraft landing laws landed on the carrier, the dynamics model of carrier-based aircraft landing gears landed on dynamic deck is built. In this model, the interactions of the carrier-based aircraft landing attitude and the damping force acting on landing gears are considered, and the influence of dynamic deck is introduced into the model through the deck normal vectors. The wheel-deck coordinate system is put forward to solve the complex simulation problem of force-onwheel which comes from the dynamic deck. At last, by simulation, it is demonstrated that the model can be applied to landing attitude when the carrier-based aircraft is landing on the dynamic deck, it is also proved that the model is comprehensive and suitable for any abnormal landing situation.

关键词： carrier-based aircraft landing gear deck wheel-deck coordinate system landing