检索结果-南通市图书馆

Solutions for a Class of Singular Nonlinear Boundary Value Problem Involving Critical Exponent

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

Acta Mathematicae Applicatae Sinica 2008年第3期24卷 453-472页

作者： yin-bin Deng Li Wang School of Mathematics and Statistics Central China Normal University Wuhan 430079 China

In this paper, we consider the existence of multiple solutions for a class of singular nonlinear boundary value problem involving critical exponent in Weighted Sobolev Spaces. The existence of two solutions is established by using the Ekeland Variational Principle. Meanwhile, the uniqueness of positive solution for the same problem is also obtained under different assumptions.

关键词： Variational methods singular boundary value problem multiple solutions

In vitro fluorescence displacement investigation of thyroxine transport disruption by bisphenol A

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第2期23卷 315-321页

作者： Jie Cao Liang-Hong Guo bin Wan yin Wei State Key Laboratory of Environmental Chemistry and Ecoloxicology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Bisphenol A （BPA） is a chemical with high production volume and wide applications in many industries. Although BPA is known as an endocrine disruptor, its toxic mechanisms have not been fully characterized. Due to its structural similarity to thyroid hormones thyroxine （T4） and triiodothyronine （T3）, one possible mechanism of BPA toxicity is disruption of hormone transport by competitive binding with the transport proteins. In this study, the binding interactions of BPA, T4, and T3 with three thyroid hormone transport proteins, human serum albumin （HSA）, transthyretin （TTR）, and thyroxine-binding globulin （TBG） were investigated by fluorescence measurement. Using two site-specific fluorescence probes dansylamide and dansyl-L-proline, the binding constants of BPA with HSA at drug site I and site II were determined as 2.90 × 10^4 and 3.14 × 10^4 L/mol, respectively. By monitoring the intrinsic fluorescence of tryptophan, a binding constant of 4.70 ×10^3 L/mol was obtained. Similarly, by employing 8-anilino-l-naphthalenesulfonic acid as fluorescence probe, the binding affinity of BPA with TTR and TBG was measured to be 3.10 × 10^5 and 5.90× 10^5 L/mol, respectively. In general, BPA showed lower binding affinity with the proteins than T3 did, and even lower affinity than T4. Using these binding constants, the amount of BPA which would bind to the transport proteins in human plasma was estimated. These results suggest that the concentrations of BPA commonly found in human plasma are probably not high enough to interfere with T4 transport.

关键词： bisphenol A human serum albumin human transthyretin human thyroxine-binding globulin fluorescence displacement method

Darwinian rebel:The legacy of Loh-Seng Tsai-Chinese animal psychologist

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2022年第10期13卷 701-706页

作者： Yong Wang Wei Chen Shiying Li bin yin Center for Brain Mindand EducationShaoxing UniversityShaoxing 312000China School of Psychology Fujian Normal UniversityFuzhou 350108China

Loh-Seng Tsai(蔡乐生,1901–1992)(Fig.1),the worldrenowned Chinese animal psychologist and psychopharmacologist,was born to a merchant family in Chaoan County,Guangdong Province on February 6th,*** was nominated for the Nobel Peace Prize in 1951 and *** Nixon praised his“exemplary academic achievements”in ***’s research in experimental psychology can be divided into two *** the first stage(1919–1949),Tsai embarked on the path of psychology as a student under the guidance of Clarence Herbert ***,Tsai expanded and popularized the experimental research conducted by comparative psychologist Zing-Yang Kuo(郭任远,1898–1970)and Harvey Carr,both of whom were Tsai’s supervisors at different times.

关键词： logist Peace expanded

MECHANISM AND PREDICTION OF MATERIAL ABRASION IN HIGH-VELOCITY SEDIMENT-LADEN FLOW

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2006年第6期18卷 760-764页

作者： HUANG Xi-bin YUAN yin-zhong College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China

The wall surface of material is prone to silt abrasion by high-velocity sediment-laden flow. The silt abrasion is different form cavitation erosion. In this article, the characteristics of silt abrasion were discussed, The mechanism of silt abrasion was analyzed and the formation and development of ripple shape on wall surface of material were explained thereafter. Based on turbulence theory and test data, some formulas were derived for predicting the abrasion rate of concrete wall surface in high-velocity sediment-laden flow. The calculated results show good agreement with the experimental data.

关键词： high-velocity sediment-flow silt abrasion,cavitation erosion abrasion rate

Implementation decision making for internetware driven by quality requirements

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2014年第7期57卷 55-73页

作者： WEI Bo JIN Zhi ZOWGHI Didar yin bin Academy of Mathematics and Systems Science Chinese Academy of Sciences Key Lab.of High Confidence Software Technologies Ministry of EducationPeking University

Internetware is an emerging software paradigm in the open,dynamic and ever-changing Internet environment.A successful internetware must demonstrate acceptable degree of quality when carrying out its ***,when internetware is being dynamically constructed,making implementation decisions to satisfice the quality requirements becomes a critical *** the traditional software engineering,quality requirements are usually refined stepwise by sub-requirements utilizing goal modeling perspective,until some potential functional design alternatives are *** goal-oriented paradigms have adopted graphical goal models to reason about quality requirements and proposed qualitative or quantitative reasoning ***,these techniques may become unviable due to the ever-changing operating environment and demands for run-time decision *** this paper,we propose an approach for implementation decision making driven by quality requirements for *** focuses on the symbolic formula representation of requirements goal models with the tree structure,which is of well-defined syntax and clear ***,we explore some reasoning rules which effectively automate each reasoning action on the *** supports multiple-factor decision making.A case study is also provided to illustrate our proposed *** have developed a supporting tool based on our theoretical approach that we also present in this paper.

关键词： design alternatives decision making implementation decision internetware quality requirements

Numerical simulation of macrosegregation in billet continuous casting influenced by electromagnetic stirring

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第4期29卷 612-627页

作者： Qi-peng Dong Jiong-ming Zhang Yan-bin yin Hiromi Nagaumi School of Iron and Steel High-Performance Metal Structural Materials Research InstituteSoochow UniversitySuzhou 215021JiangsuChina State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

A three-dimensional numerical model coupling the macrosegregation and magnetohydrodynamic simulations was developed to investigate the effects of electromagnetic stirring(EMS)on the *** results show that a significant swirling flow was induced by the in-mold EMS,which further changed the shape of the solidification shell and homogenized the solute elements in ***,the effects were only confined to the initial billet *** improvement in centerline segregation was observed with the usage of the final EMS(F-EMS),which led to the forced convection at the final solidification *** solute elements in the mushy zone were significantly even,with the maximum segregation degree of solute C reducing from 1.311 to *** addition,the effects of the stirrer positions and currents of F-EMS on the macrosegregation alleviation were numerically *** values of centerline segregation were predicted with various stirrer positions and currents,and there is an optimum stirrer parameter to obtain the best macrosegregation *** the experimental conditions,the optimum position was about 7 m away from meniscus,and the optimum current was 300 A.

关键词： Numerical simulation Macrosegregation Electromagnetic stirring Continuous casting

Ultra-lightweight CNN design based on neural architecture search and knowledge distillation: A novel method to build the automatic recognition model of space target ISAR images

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

Defence Technology（防务技术） 2022年第6期18卷 1073-1095页

作者： Hong Yang Ya-sheng Zhang Can-bin yin Wen-zhe Ding Space Engineering University Beijing101416China Beijing Institute of Tracking and Telecommunications Technology China

In this paper,a novel method of ultra-lightweight convolution neural network(CNN)design based on neural architecture search(NAS)and knowledge distillation(KD)is *** can realize the automatic construction of the space target inverse synthetic aperture radar(ISAR)image recognition model with ultra-lightweight and high *** method introduces the NAS method into the radar image recognition for the first time,which solves the time-consuming and labor-consuming problems in the artificial design of the space target ISAR image automatic recognition model(STIIARM).On this basis,the NAS model’s knowledge is transferred to the student model with lower computational complexity by the flow of the solution procedure(FSP)distillation ***,the decline of recognition accuracy caused by the direct compression of model structural parameters can be effectively avoided,and the ultralightweight STIIARM can be *** the method,the Inverted Linear Bottleneck(ILB)and Inverted Residual Block(IRB)are firstly taken as each block’s basic structure in *** the expansion ratio,output filter size,number of IRBs,and convolution kernel size are set as the search parameters to construct a hierarchical decomposition search ***,the recognition accuracy and computational complexity are taken as the objective function and constraint conditions,respectively,and the global optimization model of the CNN architecture search is ***,the simulated annealing(SA)algorithm is used as the search strategy to search out the lightweight and high accuracy STIIARM *** that,based on the three principles of similar block structure,the same corresponding channel number,and the minimum computational complexity,the more lightweight student model is designed,and the FSP matrix pairing between the NAS model and student model is ***,by minimizing the loss between the FSP matrix pairs of the NAS model and student model,the student model’s weight adjust

关键词： Space target ISAR image Neural architecture search Knowledge distillation Lightweight model

The effects of Te on the performance of Mo-V catalysts prepared by hydrothermal synthesis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第5期18卷 585-587页

作者： Hua Chang Jiang Ling Zeng bin Long yin Zhejiang University of Science and Technology Hangzhou 310012 PR China

Some Mo-V-Te--La catalysts with varied component were prepared by hydrothermal synthesis and dried with microwave method. The component of the catalyst were greatly affected the crystal structure and Raman spectrum. The phase in the catalysts was different when the Mo, V, and Te content varied. When the catalyst containing the same Mo, V content, due to the effect of dopant of Te element （V0.07 Mo0.93）5O14 became the main phase in the catalyst. The catalyst also showed good activity for the reaction of selective oxidation propane to acrolein and acrylic acid.

关键词： Mo-V based catalysts Hydrothermal synthesis Propane Acrylic acid

Microstructural Instability of an Experimental Nickel-Based Single-Crystal Superalloy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2020年第10期33卷 1433-1441页

作者： bin yin Guang Xie Xiangwei Jiang Shaohua Zhang Wei Zheng Langhong Lou Superalloys Division Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

Microstructural instability with the precipitation of topologically close-packed(TCP)phases of an experimental nickel-based single-crystal superalloy has been investigated.A significant amount of σ phases are distinguished in the interdendritic region of the as-cast samples after thermal exposure at 900℃ for 1000 ***σphases are preferentially precipitated at the periphery of coarse γ/γ′eutectic,and their morphological evolution from needles to granules is *** analysis suggests that the local segregation of Cr and Ti at the periphery of coarse γ/γ′eutectic accounts for the formation ofσphases in the as-cast *** heat treatment with low solution temperature and short holding time,the dendritic segregation of alloying elements(i.e.,W,Re,Ti and Ta)and the volume fraction of γ′phase in the interdendritic region are similar to that of the as-cast ***,no TCP phases are present in the interdendritic region of the heat-treated samples after thermal exposure,which is primarily ascribed to the elimination of local segregation of Cr and Ti near the coarse γ/γ′***,small quantities ofμphases are precipitated in the secondary dendrite arm near the interdendritic region after thermal exposure,due to the increased volume fraction ofγ′phase and the concomitant enrichment of W and Re in theγmatrix.

关键词： Nickel-based single-crystal superalloy Topologically close-packed(TCP)phases Segregation Eutectic