检索结果-南通市图书馆

Auxiliary transportation mode in a fully-mechanized face in a nearly horizontal thin coal seam

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2015年第6期25卷 963-968页

作者： Wang Chen tu Shihao zhang Lei Yang Qianlong tu Hongsheng School of Mines China University of Mining & Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining & Technology China-Australia Mining Research Center China University of Mining & Technology

On fully-mechanized faces in nearly horizontal thin coal seams （NHTCS）, the selection of the auxiliary transportation mode is difficult. Generally, auxiliary transportation mainly includes trackless or rail transportation. Combined with a familiar NHTCS fully-mechanized face, a multi-attribute decision- making model was set up for the decision. The index weight was objectively determined with the fuzzy number and entropy method. The priority order of auxiliary transportation modes was obtained from the Preference Ranking Organization Method for Enrichment Evaluation （PROMETHEE）. The results show that： the net flow of the mode can be expressed by the function of the surrounding rock deformation of the roadway, the dimension of equipment and the thickness of the coal seam; Based on the cost type index, there is a positive correlation between the net flow with the height and width of the trackless auxiliary transportation equipment, respectively. The trackless auxiliary transportation equipment selection principle should be ＂height first then width＂. Combined with the field application of the trackless auxil- iary transportation in Liangshuijing coal mine, the proper method to achieve the safe and high-efficient exploitation of a NHTCS fully-mechanized face is trackless tvred vehicle auxiliary transportation.

关键词： Nearly horizontalTrackless transportationRail transportationPROMETHEEEntropy methodEquipment selection

Recent Advances on Surface-modified Biomaterials Promoting Selective Adhesion and Directional Migration of Cells

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第7期39卷 815-823页

作者： Chen-Xi tu Chang-You Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

The surfaces and interfaces of biomaterials interact with the biological systems in multi-scale levels,and thereby influence the biological functions and comprehensive performance in vitro and in *** particular,a surface promoting the selective adhesion and directional migration of desired types of cells in complex environment is extremely important in the repair and regeneration of tissues such as peripheral nerve and blood vessel,and long-term application of intracorporal devices such as intravascular ***,surface modification of biomaterials is a facile and effective method to achieve the desired cell-biomaterials *** this short review,recent advances on the surface modification of biomaterials to regulate selective cell adhesion and migration are briefly *** particular,the surface properties of biomaterials are manipulated via the convenient introduction of amino groups to the ester-based polymers,the formation of polyelectrolyte multilayers,and the fabrication of topology and gradient cues,etc.,followed by the association of chemical and biological signals such as collagen,heparin,hyaluronic acid,peptides and cell growth *** selective adhesion and directional migration of various types of cells such as endothelial cells(ECs),smooth muscle cells(SMCs),hepatocytes and Schwann cells(SCs)are achieved over the competitive counterpart cells by the use of cell-resisting substances and cell-selective motifs on gradient substrates in most *** advances on cell behaviors in three-dimensional(3D)ceH-extracellular matrix(ECM)-mimicking substrates are also reviewed.

关键词： Biomaterials Surface modification Gradient Cell migration Cell selectivity

Laser light scattering technique for non-invasive in situ simultaneous measurements on elastic constants and viscosity coefficients of nematic liquid crystals

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2004年第1期47卷 79-85页

作者： tu Mei HUANG Yaoxiong Institute of Biomedical Engineering Jinan University Guangzhou 510632 China Institute of Biomedical Engineering Jinan University Guangzhou 510632 China

The laser light scattering technique for non-invasivein situ simultaneous measurements on elastic constants and viscosity coefficients of nematic liquid crystals is introduced. By measuring the autocorrelation function of the scattered light from nematic liquid crystals at different scattering angles, the splay and twist elastic constantsK 11 andK 22 are obtained from the amplitudes of the autocorrelation function, and the viscosity coefficients ofη Splay andη Twist are determined using the viscoelastic ratiosK 11/η Splay andK 22 η Twist from the telaxation parameters of the two modes.

关键词： dynamic light scattering, nematic liquid crystal, elastic constants, viscosity coefficients.

Uniqueness Theorems for Meromorphic Mappings in Several Complex Variables into P^N(C) with Two Families of Moving Targets

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2013年第5期34卷 719-732页

作者： Zhonghua WANG Zhenhan tu School of Mathematics and Statistics Wuhan University

The authors prove some uniqueness theorems for meromorphic mappings in several complex variables into the complex projective space PN(C)with two families of moving targets,and the results obtained improve some earlier... 详细信息

关键词： Meromorphic mapping Moving target Uniqueness theorem Valuedistribution theory

Random vibration analysis of FGM plates subjected to moving load using a refined stochastic finite element method

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第4期34卷 42-56页

作者： Ngoc-tu Do Trung Thanh Tran Faculty of Mechanical Engineering Hanoi University of IndustryHanoiViet Nam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiViet Nam

The article introduces a finite element procedure using the bilinear quadrilateral element or four-node rectangular element(namely Q4 element) based on a refined first-order shear deformation theory(rFSDT) and Monte Carlo simulation(MCS), so-called refined stochastic finite element method to investigate the random vibration of functionally graded material(FGM) plates subjected to the moving *** advantage of the proposed method is to use r-FSDT to improve the accuracy of classical FSDT, satisfy the stress-free condition at the plate boundaries, and combine with MCS to analyze the vibration of the FGM plate when the parameter inputs are random quantities following a normal distribution. The obtained results show that the distribution characteristics of the vibration response of the FGM plate depend on the standard deviation of the input parameters and the velocity of the moving ***, the numerical results in this study are expected to contribute to improving the understanding of FGM plates subjected to moving loads with uncertain input parameters.

关键词： FGM Moving load R-FSDT Q4 element Monte Carlo simulation Random vibration

Dynamic analysis of bio-inspired helicoid laminated composite plates resting on Pasternak foundation excited by explosive loading

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2023年第12期30卷 126-140页

作者： Ngoc-tu Do Quoc-Hoa Pham Faculty of Mechanical Engineering Hanoi University of IndustryHanoiViet Nam Faculty of Engineering and Technology Nguyen Tat Thanh UniversityHo Chi Minh CityViet Nam

This paper uses isogeometric analysis(IGA)based on higher-order shear deformation theory(HSDT)to study the dynamic response of bio-inspired helicoid laminated composite(B-iHLC)plates resting on Pasternak foundation(PF)excited by explosive *** takes advantage of non-uniform rational Bspline(NURBS)basic functions to exactly represent the structure geometry models and the attainment of higher-order approximation *** method also ensures a C1 continuous function in the analysis of transverse shear deformation via ***,IGA eliminates the requirement for correction factors and delivers accurate *** foundation with two stiffness parameters:springer stiffness(k_(1))and shear stiffness(k_(2)).The derivation of the governing equations is based on Hamilton's *** proposed method is validated through numerical examples.A comprehensive analysis of the impact of geometrical parameters,material properties,boundary conditions(BCs),and foundation stiffness on dynamic response of B-i HLC plates is carried out.

关键词： Isogeometric analysis Pasternak foundation Dynamic response Laminated composite

Normal families of meromorphic mappings of several complex variables into P^(N)(C) for moving targets

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2005年第Z1期48卷 355-364页

作者： tu Zhenhan LI Pingli School of Mathematics and Statistics Wuhan UniversityWuhan430072China School of Mathematics and StatisticsWuhan UniversityWuhan430072China

Motivated by Ru and Stoll's accomplishment of the second main theorem in higher dimension with moving targets, many authors studied the moving target problems in value distribution theory and related topics. But thereafter up to the present, all of researches about normality criteria for families of meromorphic mappings of several complex variables into PN(C) have been still restricted to the hyperplane case. In this paper, we prove some normality criteria for families of meromorphic mappings of several complex variables into PN(C) for moving hyperplanes, related to Nochka's Picard-type *** new normality criteria greatly extend earlier related results.

关键词： complex projective spaces, meromorphic mappings, moving targets, normal families and value distribution theory.

Montel-Type Theorems in Several Complex Variables with Continuously Moving Targets

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2010年第3期31卷 373-384页

作者： Zhenhan tu Shasha zhanG Department of Mathematics and Statistics Wuhan University Wuhan 430072 China

The authors introduce a new idea related to Montel-type theorems in higher dimension and prove some Montel-type criteria for normal families of holomorphic mappings and normal holomorphic mappings of several complex variables into PN(C) for continuously moving hyperplanes in pointwise general position. The main results are also true for continuously moving hypersurfaces in pointwise general position. Examples are given to show the sharpness of the results.

关键词： Holomorphic mappings Normal families Picard-type theorems Valuedistribution theory

Robust Unsupervised Discriminative Dependency Parsing

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2020年第2期25卷 192-202页

作者： Yong Jiang Jiong Cai Kewei tu School of Information Science and Technology Shanghai Tech UniversityShanghai 201210China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050 University of Chinese Academy of Sciences Beijing 100049China

Discriminative approaches have shown their effectiveness in unsupervised dependency ***,due to their strong representational power,discriminative approaches tend to quickly converge to poor local optima during unsupervised *** this paper,we tackle this problem by drawing inspiration from robust deep learning ***,we propose robust unsupervised discriminative dependency parsing,a framework that integrates the concepts of denoising autoencoders and conditional random field *** this framework,we propose two types of sentence corruption mechanisms as well as a posterior regularization method for robust *** tested our methods on eight languages and the results show that our methods lead to significant improvements over previous work.

关键词： unsupervised learning dependency parsing autoencoders