Title: Exciton binding energy and excitonic absorption spectra in a parabolic quantum wire under transverse electric field
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Classification code:451 Air Pollution - 451.1 Air Pollution Sources - 454.3 Ecology and Ecosystems - 801.1 Chemistry, General - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc.
Accession number:20110813692716 Title:Electrospinning of poly(trimethylene terephthalate)/carbon nanotube composites Authors:Wu, Defeng (1); Shi, Tiejun (2); Yang, Tao (1); Sun, Yurong (1); Zhai, Linfeng (2); Zhou, Weidong (3); Zhang, Ming (1); Zhang, Jie (1) Author affiliation:(1) School of Chemistry and Chemical Engineering, Yangzhou University, Jiangsu 225002, China; (2) Institute of Chemical Engineering, Heifei University of Technology, Anhui 230009, China; (3) Testing Center, Yangzhou University, Jiangsu 225002, China Corresponding author:Wu, D.(dfwu@yzu.edu.cn) Source title:European Polymer Journal Abbreviated source title:Eur Polym J Volume:47 Issue:3
Issue date:March 2011 Publication year:2011 Pages:284-293 Language:English ISSN:00143057 CODEN:EUPJAG Document type:Journal article (JA) Publisher:Elsevier Ltd, Langford Lane, Kidlington, Oxford, OX5 1GB, United Kingdom Abstract:Poly(trimethylene terephthalate) (PTT) nanocomposites containing carbon nanotubes (CNTs) with different surface structure and aspect ratio were prepared by melt compounding for electrospinning. The dispersion state of the CNTs in the composites was then examined utilizing rheology tools. The results show that carboxylic surface functionalized CNTs present better dispersion in the matrix than hydroxy surface functionalized CNTs because the former has stronger affinity to the PTT. Besides surface functionalization, the aspect ratio of CNTs is also vital to their final dispersion. The CNTs with lower aspect ratio are dispersed as individuals or small bundles while those with higher aspect ratio are dispersed mainly as flocs with large hydrodynamic radius, showing higher effective volume fraction. The presence of CNTs has a large influence on the morphologies of electrospun fiber and on the appearances of CNTs in the fibers. In the presence of CNTs with lower aspect ratio, continuous composite fibers are obtained. But the structure of those continuous fibers highly depends on the surface group of CNTs. Carboxylic surface functionalized CNTs are well embedded by the PTT and oriented along the fiber axis during electrospinning, leading to bead-free and uniform fiber morphology; while hydroxy surface functionalized CNTs show tortuous conformations with less orientation in the fibers, and as a result, the obtained fibers show beaded and misshaped morphologies. In the case of higher aspect ratio, however, the CNTs prefer to exist as entanglements or knots in the streamlines, and thereby only beaded or even uncontinuous fibers are obtained. Therefore, the formation and fiber morphology of PTT/CNT composite fibers obtained by electrospinning strongly depend on the surface functional groups of the CNTs, as well as on the CNT structure. © 2011 Elsevier Ltd. All rights reserved. Number of references:34 Main heading:Electrospinning Controlled terms:Aspect ratio - Carbon nanotubes - Dispersions - Elasticity - Fibers - Functional groups - Morphology - Nanocomposites - Rheology - Surface morphology - Viscosity Uncontrolled terms:Carbon-nanotube composites - Composite fibers - Composites - Dispersion state - Effective volume - Electrospun fibers - Fiber axis - Fiber morphology - Functionalized - Hydrodynamic Radius - matrix - Melt-compounding - Poly(trimethylene terephthalate) - Surface functional groups - Surface Functionalization - Surface groups Classification code:943 Mechanical and Miscellaneous Measuring Instruments - 933 Solid State Physics - 931.1 Mechanics - 819.3 Fiber Chemistry and Processing - 817 Plastics and Other Polymers: Products and Applications - 951 Materials Science - 812 Ceramics, Refractories and Glass - 761 Nanotechnology - 631.1 Fluid Flow, General - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties - 804.1 Organic Compounds DOI:10.1016/j.eurpolymj.2010.12.006 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc.
Accession number:20110713664931 Title:Theoretical study on the mechanism and kinetics of the reaction of 2,2',4,4'-tetrabrominated diphenyl ether (BDE-47) with OH radicals Authors:Cao, Haijie (1); He, Maoxia (1); Han, Dandan (1); Sun, Yanhui (1); Xie, Ju (2) Author affiliation:(1) Environment Research Institute, Shandong University, Shanda nanlu 27, Jinan 250100, China; (2) College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China Corresponding author:He, M.(hemaox@sdu.edu.cn) Source title:Atmospheric Environment Abbreviated source title:Atmos. Environ. Volume:45 Issue:8
Issue date:March 2011 Publication year:2011 Pages:1525-1531 Language:English ISSN:13522310 CODEN:AENVEQ Document type:Journal article (JA) Publisher:Elsevier Ltd, Langford Lane, Kidlington, Oxford, OX5 1GB, United Kingdom Abstract:The mechanism and kinetic properties of OH-initiated gas-phase reaction of 2,2',4,4'-tetrabrominated diphenyl ether (BDE-47) have been studied at the MPWB1K/6-311. +. G(3df,2p)//MPWB1K/6-31G(d) level of theory. Two types of reactions including hydroxyl addition and hydrogen abstraction have been considered. The calculation results indicate that addition reactions except for the bromo-substituted addition reaction have lower energy barriers than hydrogen abstraction reactions. Hydroxyl radical is most likely to be added to non-substituted C atoms (C(3), C(5), and C(6) atoms). Moreover, for all the reactions with OH radical, the bromo-substituted C atoms encountered the highest barrier compared to that of the rest C atoms. The rate constants and product branching ratios of each pathway have been deduced over a wide range of 200-1000. K using canonical variational transition state (CVT) theory with small curvature tunneling (SCT) contribution. This study can be regarded as an attempt to investigate the OH-initiated photochemical reaction mechanism of polybrominated diphenyl ethers (PBDEs). © 2010 Elsevier Ltd. Number of references:45 Main heading:Addition reactions Controlled terms:Abstracting - Atoms - Ethers - Free radicals - Hydrogen - Organic compounds - Phase interfaces - Photochemical reactions - Polyacrylates - Rate constants - Reaction kinetics Uncontrolled terms:BDE-47 - C atoms - Canonical variational transitions - Diphenyl ether - Gas-phase reactions - Hydrogen abstraction - Hydrogen abstraction reaction - Hydroxyl radicals - Lower energy barriers - Mechanism and kinetics - OH radical - OH radicals - Polybrominated diphenyl ethers - Product branching ratios - Reaction mechanism - Small-curvature tunneling - Theoretical study Classification code:931.3 Atomic and Molecular Physics - 931.2 Physical Properties of Gases, Liquids and Solids - 903.1 Information Sources and Analysis - 815.1.1 Organic Polymers - 804.1 Organic Compounds - 804 Chemical Products Generally - 802.2 Chemical Reactions DOI:10.1016/j.atmosenv.2010.12.045 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc.
Accession number:20111913966315 Title:Research on establishing network intrusion modeling based on MLL-AT Authors:Yan, Fen (1); Yin, Xin-Chun (1); Huang, Hao (2) Author affiliation:(1) Department of Computer Science and Engineering, Technology Institute, Yangzhou University, Yangzhou 225009, China; (2) Department of Computer Science and Technology, Nanjing University, Nanjing 210093, China Corresponding author:Yan, F. Source title:Tongxin Xuebao/Journal on Communications Abbreviated source title:Tongxin Xuebao Volume:32 Issue:3
Issue date:March 2011 Publication year:2011 Pages:115-124 Language:Chinese ISSN:1000436X Document type:Journal article (JA) Publisher:Editorial Board of Journal on Communications, No.1 Binhe Road, Hepingli, Dongcheng District, Beijing, 1000013, China Abstract:The method of modeling attack using attack tree was researched. The main research goal was how to effectively use the attack tree model and denote the multi-stage network attacks. Traditional attack tree was expanded and improved. Nodes of attack tree were redefined, and attack risk of leaf node was quantified. Then the mentality and method for establishing MLL-AT (multi-level & layer attack tree) were proposed. Based on the given attack tree, the MLL-ATDL (multi-level & layer attack tree description language) attack description language was given. The improved attack tree can model the attacks more accurately, in particular the multi-stage network attacks. And it can also be used for appraising system risk, distinguishing the different degrees of system security threats caused by different attack sequences. Number of references:15 Main heading:Computer crime Controlled terms:Network security - Research Uncontrolled terms:Attack tree - Description languages - Different attacks - Intrusion modeling - Method of modeling - Multi-level - Multi-stage - Network attack - Network intrusions - Research goals - System risk - System security Classification code:723 Computer Software, Data Handling and Applications - 901.3 Engineering Research Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc.
Accession number:20112013989725 Title:Optimal methods and its application of large pumping station operation Authors:Feng, Xiaoli (1); Qiu, Baoyun (1); Yang, Xingli (1); Shen, Jian (1); Pei, Bei (1) Author affiliation:(1) School of Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China Corresponding author:Qiu, B.(yzdxqby@sohu.com) Source title:Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering Abbreviated source title:Paiguan Jixie Xuebao. Volume:29 Issue:2
Issue date:March 2011 Publication year:2011 Pages:127-132 Language:Chinese ISSN:16748530 CODEN:PAJIE2 Document type:Journal article (JA) Publisher:Editorial Department of Drainage and, 30 Mengxiyuan Lane, Zhenjiang, 212003, China Abstract:In order to master modern optimal methods, which are suitable for solving large pumping station optimal operation with multivariables. Basic principles of genetic algorithms(GA), particle swarm optimization(PSO) and simulated annealing particle swarm optimization(SA-PSO) were introduced, and the similarities and differences were analyzed. It is concluded that PSO is more simple and efficient than GA. Taking Jiangdu pumping station system in Eastern Route of South to North Water Transfer Project as an example, under the circumstances of certain pump assembly head, selecting the number of running pump units and blade setting angles of water pumps as variables, optimal mathematical models for pumping station operation schemes were established aiming at the least operation cost, meeting the constraint conditions such as total pumping discharge, allowed discharge of single pump and the number of running pump units. GA, PSO and SA-PSO were applied to solve the models respectively to determine the number of running pump units, operation duties of pump units and daily operation cost of each pumping station. Constraint conditions were used to deal with feasible rules, and calculating procedure was programmed with Matlab. The results indicate that the operation costs of the optimum schemes by adjusting pump blade setting angles with SA-PSO are 0.99%-4.22% less than that of the conventional schemes under design blade angles, and among the three optimum schemes, the operation cost of the optimum scheme based on SA-PSO is about 0.22%-2.80%, 0.02%-0.40% less than that based on GA and PSO respectively. Computing times of the three optimizing algorithms are 30, 52 and 25 s respectively. Therefore, SA-PSO is more suitable for solving large pumping station operation optimization problems. Number of references:10 Main heading:Particle swarm optimization (PSO) Controlled terms:Costs - Genetic algorithms - Mathematical models - Pumping plants - Pumps - Simulated annealing Uncontrolled terms:Basic principles - Blade angle - Constraint conditions - Conventional schemes - Feasible rules - Large pumping stations - Multi variables - Operation cost - Operation schemes - Optimal methods - Optimal operation - Optimization methods - Optimizing algorithm - Pumping discharge - Pumping station operation - Pumping stations - Single pumps - South to North Water Transfer Project - Water pump Classification code:446 Waterworks - 618.2 Pumps - 723 Computer Software, Data Handling and Applications - 911 Cost and Value Engineering; Industrial Economics - 921 Mathematics DOI:10.3969/j.issn.1674-8530.2011.02.08 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc.
Accession number:20111813958495 Title:Non-fragile optimal H Authors:Huang, Yi-Qing (1); Wang, Li (1); Sun, Chang-Yin (1) Author affiliation:(1) School of Automation, Southeast University, Nanjing 210096, China; (2) School of Energy and Power Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China Corresponding author:Sun, C.-Y.(cysun@seu.edu.cn) Source title:Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University Abbreviated source title:Shanghai Jiaotong Daxue Xuebao Volume:45 Issue:3
Issue date:March 2011 Publication year:2011 Pages:423-428 Language:Chinese ISSN:10062467 CODEN:SCTPDH Document type:Journal article (JA) Publisher:Shanghai Jiao Tong University, 2200 Xietu Rd, Shanghai, 200032, China Abstract:A kind of robust mixed non-fragile optimal H Number of references:13 Main heading:Controllers Controlled terms:Closed loop systems - Hypersonic aerodynamics - Hypersonic vehicles - Linear control systems - Linear matrix inequalities - Longitudinal control - Multiobjective optimization - Poles - Poles and zeros - Uncertain systems - Vehicles Uncontrolled terms:Air breathing - Control performance - Flight conditions - Gain variations - Linear quadratic regulator - LQR control - Multi objective - Non-fragile - Non-fragile control - Nonfragile controllers - Parametric uncertainties - Regional pole placement - Robust guaranteed cost control - Simulation comparison - Uncertain models Classification code:921 Mathematics - 732.1 Control Equipment - 731.3 Specific Variables Control - 961 Systems Science - 655.1 Spacecraft, General - 432 Highway Transportation - 408.2 Structural Members and Shapes - 651.1 Aerodynamics, General Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. Accession number:20111213847991 Title:A modified gauss-newton iterative method for nonlinear models with right-censored data Authors:Xu-Ping, Zong (1); Guolin, Feng (2) Author affiliation:(1) School of Mathematics, Yangzhou University, Yangzhou, Jiangsu, 225002, China; (2) Chinese National Climate Center, 100081, China Corresponding author:Xu-Ping, Z. Source title:Journal of Algorithms and Computational Technology Abbreviated source title:J. Algorithms Comput. Technol. Volume:5 Issue:1
Issue date:March 1, 2011 Publication year:2011 Pages:105-110 Language:English ISSN:17483018 E-ISSN:17483026 Document type:Journal article (JA) Publisher:Multi-Science Publishing Co. Ltd, 5 Wates Way, Brentwood, Essex, CM15 9TB, United Kingdom Abstract:This paper presents Modified Gauss-Newton iteration algorithm for the nonlinear regression models for Failure Time Data set. The convergence of the iteration is proved carefully. Simulation illustrated that our method is available. Our results may be regarded as an extension of Wei (1998) for exponential nonlinear regression models without failure time data. Number of references:12 Main heading:Iterative methods Controlled terms:Algorithms - Gaussian distribution - Regression analysis Uncontrolled terms:Censored data - Failure time data - Gauss-Newton - Gauss-Newton iteration - Non-linear model - Nonlinear regression models Classification code:723 Computer Software, Data Handling and Applications - 921 Mathematics - 921.6 Numerical Methods - 922.2 Mathematical Statistics DOI:10.1260/1748-3018.5.1.105 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc.
Accession number:20111913966210 Title:Comparison on performance prediction methodologies of low-head pump systems based on CFD Authors:Zhang, Rentian (1); Yue, Xiubin (2); Zhu, Honggeng (1); Yao, Linbi (3) Author affiliation:(1) College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China; (2) Jiangsu Water Supply Co. Ltd. for S-to-N Water Diversion Project, Nanjing 210029, China; (3) Jiangsu Surveying and Design Institute of Water Resources Co. Ltd., Yangzhou 225009, China Corresponding author:Zhu, H.(hgzhu@163.com) Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery Abbreviated source title:Nongye Jixie Xuebao Volume:42 Issue:3
Issue date:March 2011 Publication year:2011 Pages:85-90 Language:Chinese ISSN:10001298 CODEN:NUYCA3 Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China Abstract:A mixed-flow pumping system was selected as the study case based on CFD technologies. Two difference methodologies of flow field analysis and performance prediction were conducted. One method was that the system efficiency was the production of pump efficiency with passage efficiency obtained by separate numerical simulation of suction box and discharge passage without pump. The other one was based on the simulation of whole pumping system including the suction box, discharge passage and pump. The predicted results from the two different methodologies were compared with model system test results, which showed that the predicted errors were different. The error of pumping system efficiency was smaller when the numerical simulation of whole pumping system was adopted, while the error was much greater when the system efficiency was predicted by the production of passage efficiency with pump efficiency, approximately equal only near the best efficiency point. The larger errors in predicting pumping system efficiency for the first method were mainly caused by unreasonable theoretic foundation. Therefore, it is suggested that the suction box, discharge passage and pump should be taken as a whole in numerical simulation and performance prediction and the effect of pump should be considered in the optimal hydraulic design of suction box and discharge passage. Number of references:13 Main heading:Pumps Controlled terms:Computational fluid dynamics - Computer simulation - Efficiency - Errors - Forecasting - Mathematical models - Numerical methods - Pumping plants Uncontrolled terms:Best efficiency point - CFD - Field analysis - Flow pumping - Hydraulic designs - Model system - Numerical simulation - Performance prediction - Predicted error - Pump efficiency - Pump system - Pumping system - Pumping systems - Study case - Suction box - System efficiency Classification code:446 Waterworks - 618.2 Pumps - 723.5 Computer Applications - 913.1 Production Engineering - 921 Mathematics - 921.6 Numerical Methods Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. Accession number:20112013990459 Title:Predicting grain protein content in winter wheat based on TM images and partial least squares regression Authors:Tan, Changwei (1); Wang, Jihua (2); Huang, Wenjiang (2); Wang, Junchan (2); Zhu, Xinkai (1); Guo, Wenshan (1) Author affiliation:(1) Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Lower Reaches of Yangtse River of Ministry of Agriculture, Yangzhou University, Yangzhou 225009, China; (2) National Engineering Research Center for Information Technology in Agriculture, Beijing 100089, China Corresponding author:Guo, W.(guows@yzu.edu.cn) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:27 Issue:3
Issue date:March 2011 Publication year:2011 Pages:388-392 Language:Chinese ISSN:10026819 CODEN:NGOXEO Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China Abstract:In order to further improve the accuracy of predicting winter wheat grain protein content (GPC) by remote sensing, the study analyzed the quantitative relationship between satellite remote sensing variables and GPC. Depending on the partial least squares regression (PLS), the multivariable remote sensing prediction model and the space level distribution map of winter wheat grain protein content were constructed. For the PLS model, the number of the best principal components was 5, and normalized difference vegetation index (NDVI), structure insensitive pigment index (SIPI), ratio vegetation index (RVI), nitrogenous reflection index (NRI) and plant senescence reflectance index (PSRI) were identified as the sensitive remote sensing variables for predicting GPC. The determination coefficient (R2) and the root mean square error (RMSE) between estimated value and measured value of GPC were 0.642 and 0.307%, respectively. The results indicate that PLS method can provide an effective way to improve the accuracy of predicting wheat grain quality at large scale by remote sensing data. Number of references:20 Main heading:Grain (agricultural product) Controlled terms:Forecasting - Mammals - Mathematical models - Model predictive control - Predictive control systems - Principal component analysis - Proteins - Remote sensing - Space optics - Vegetation Yüklə 2,34 Mb. Dostları ilə paylaş:
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