Title: Exciton binding energy and excitonic absorption spectra in a parabolic quantum wire under transverse electric field

Number of references:9

Main heading:Reservoirs (water)

Controlled terms:Energy dissipation - Evaporation - Flood control - Lakes - Phase transitions - Pumping plants - Pumps - Water supply

Uncontrolled terms:Evaporating capacity of water surface - Jiangsu section - Water diversions - Water transfer channels - Water transfer efficiency of project

Classification code:802.3 Chemical Operations - 801.4 Physical Chemistry - 618.2 Pumps - 525.4 Energy Losses (industrial and residential) - 454.1 Environmental Engineering, General - 446.1 Water Supply Systems - 446 Waterworks - 441.2 Reservoirs - 407 Maritime and Port Structures; Rivers and Other Waterways

DOI:10.3969/j.issn.1674-8530.2011.03.008

Database:Compendex

Compilation and indexing terms, Copyright 2011 Elsevier Inc.

Accession number:20112514082285

Title:Characteristics of flow in large vertical axial flow pumping system

Authors:Yang, Fan (1); Liu, Chao (1); Tang, Fangping (2); Zhou, Jiren (1)

Author affiliation:(1) College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China; (2) College of Energy and Power Engineering, Yangzhou University, Yangzhou 225009, China

Corresponding author:Liu, C.([e-mail])

Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

Abbreviated source title:Nongye Jixie Xuebao

Volume:42

Issue:5

Issue date:May 2011

Publication year:2011

Pages:39-43+55

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:The internal flow field in a vertical axial flow pumping system was simulated by CFX software using the Reynolds averaged N-S equations and RNG k-Ε turbulence model. Focusing on details of the inlet flow field, the flow characteristics in the inlet and outlet passages of pumping system were analyzed based on the calculation of different operating conditions with the flow rates range 180-340 L/s at the rated rotating speed. The results show that rotating of impeller has effects on the distribution of axial and tangential velocity components at the pump inlet, but the numerical values are relatively small. Outlet circulation of guide vane has great influence on flow pattern in the outlet passage. The flow distribution for both sides of the dividing pier is not symmetric, especially for small flow rate condition, the helical flow occurs at the right side of dividing pier. A good agreement is achieved in the performances of the pumping system between the predicted data and experimental data at the best efficiency point, which can meet the requirement of practical application.

Number of references:8

Main heading:Inlet flow

Controlled terms:Axial flow - Flow fields - Flow rate - Navier Stokes equations - Piers - Pumping plants - Pumps - Rotation - Turbulence models

Uncontrolled terms:Best efficiency point - Experimental data - Flow characteristic - Flow distribution - Flow pumping - Guide vane - Helical flows - Hydraulic performance - Inlet and outlet passages - Internal flow field - N-S equations - Numerical values - Operating condition - Pumping systems - Reynolds averaged - Rotating speed - Small flow-rate - Tangential velocity component - Vertical pumping system

Classification code:407.1 Maritime Structures - 446 Waterworks - 601.1 Mechanical Devices - 618.2 Pumps - 631 Fluid Flow - 631.1 Fluid Flow, General

Database:Compendex

Compilation and indexing terms, Copyright 2011 Elsevier Inc.

Accession number:20111113746141

Title:A simple fluorescence quenching method for roxithromycin determination using CdTe quantum dots as probes

Authors:Peng, Jinyun (1); Hu, Xiaoya (2)

Author affiliation:(1) Department of Chemistry and Biological Science, Guangxi Normal University of Nationalities, Chongzuo 532200, China; (2) College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China

Corresponding author:Peng, J.([e-mail])

Source title:Journal of Luminescence

Abbreviated source title:J Lumin

Volume:131

Issue:5

Issue date:May 2011

Publication year:2011

Pages:952-955

Language:English

ISSN:00222313

CODEN:JLUMA8

Document type:Journal article (JA)

Publisher:Elsevier, P.O. Box 211, Amsterdam, 1000 AE, Netherlands

Abstract:A new method for the determination of roxithromycin based on the fluorescence quenching of 3-mercaptopropionic acid-capped CdTe quantum dots (MPA-CdTe QDs) was developed. In ethanol medium, the fluorescence of CdTe quantum dots at 552 nm was quenched in the presence of roxithromycin. Based on this a simple, sensitive, and selective method for rapid determination of roxithromycin was described. Reaction time, interfering substances on the fluorescence quenching, and mechanism of the interaction of CdTe QDs with roxithromycin were investigated. After optimization, the proposed method allows the determination of roxithromycin over the range 25.0350.0 μg ml ^-1. The detection limit is 4.6 μg ml^-1. The proposed method was successfully applied to commercial capsules and tablets with satisfactory results. The recovery of the method was in the range of 96.8102.5%. © 2010 Elsevier B.V. All rights reserved.

Number of references:21

Main heading:Semiconductor quantum dots

Controlled terms:Cadmium alloys - Cadmium compounds - Ethanol - Fluorescence - Quenching

Uncontrolled terms:3-mercaptopropionic acid - CdTe - CdTe quantum dots - Detection limits - Determination - Ethanol medium - Fluorescence quenching - Fluorescence quenching method - Interfering substances - Quantum dots - Rapid determination - Reaction time - Roxithromycin

Classification code:523 Liquid Fuels - 537.1 Heat Treatment Processes - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 714.2 Semiconductor Devices and Integrated Circuits - 741.1 Light/Optics - 804.1 Organic Compounds

DOI:10.1016/j.jlumin.2010.12.030

Database:Compendex

Compilation and indexing terms, Copyright 2011 Elsevier Inc.

Accession number:20112714111970

Title:Medium-term electric-power load forecasting based on spectrum analysis and LS-SVM

Authors:Li, Zhao-Nian (1); Tao, Feng-Ling (1); Shi, Wang-Wang (2); Jiang, Nan (2); Li, Ji-Hua (1); Ni, San-Chuan (1)

Author affiliation:(1) Qinghai University, Xining 810016, China; (2) Yangzhou University, Yangzhou 225009, China

Corresponding author:Li, Z.-N.([e-mail])

Source title:Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control

Abbreviated source title:Dianli Xitong Baohu yu Kongzhi

Volume:39

Issue:9

Issue date:May 1, 2011

Publication year:2011

Pages:88-90+96

Language:Chinese

ISSN:16743415

Document type:Journal article (JA)

Publisher:Power System Protection and Control Press, 1706 XJ Avenue, Xuchang, 461000, China

Abstract:For the shortcoming of the SVM using in short series of power load forecasting, namely the choice of space divided parameters is influenced by subjective factors, a novel method of power load forecasting combining the spectrum analysis with LS-SVM method is presented. This method adopts the spectrum analysis to forecast the cycle of actual maximum power load and determines the training mode of SVM based on the cycle. The subjective factors in preferences are effectively avoided, and the prediction accuracy is improved. The practical example shows that except the last point in which the relative error is 8.67%, the relative errors of other points are less than ± 5%. Our method provides a better fit to the predicted data and shows high accuracy.

Number of references:5

Main heading:Electric load forecasting

Controlled terms:Absorption spectra - Forecasting - Interferometry - Spectrum analysis

Uncontrolled terms:Load forecasting - LS-SVM - Maximum power - Novel methods - Power load - Power load forecasting - Precision - Prediction accuracy - Relative errors - Subjective factors - Training mode

Classification code:943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941.4 Optical Variables Measurements - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 741.1 Light/Optics - 706.1 Electric Power Systems - 921 Mathematics

Database:Compendex

Compilation and indexing terms, Copyright 2011 Elsevier Inc.

Accession number:20112614103313

Title:Research on optimal operation for multi-units with variable speed in one pumping station based on the theory of experimental and integer programming method

Authors:Zhang, Lihua (1); Cheng, Jilin (1); Zhang, Rentian (1); Gong, Yi (1)

Author affiliation:(1) College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China; (2) Jiangsu Surveying and Design Institute of Water Resources Co., Ltd., Yangzhou 225009, China

Corresponding author:Cheng, J.([e-mail])

Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering

Abbreviated source title:Nongye Gongcheng Xuebao

Volume:27

Issue:5

Issue date:May 2011

Publication year:2011

Pages:156-159

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:Taking No.4 Jiangdu Pumping Station as a study case, which is one of the source stations in Eastern Route of South-to-North Water Diversion Project in China, the optimal operation of single pumping station for multiple pump units with variable speed was studied. The non-linear model of optimal daily operation for multiple pump units with variable speed was constructed with consideration of peak-valley electricity price and tides variation. Keeping the blade angle of pump unit at designed value, this model took the minimal electricity cost of multiple pump units as objective function, the time period as stage variable, the pump speed and quantity of operation units as decision variables, and the quantity of daily water pumped as constrain condition. The method which took the pump speed for experimental optimization, the quantity of operation units for linear integer programming was proposed to solve the model. The optimization results showed that under the average daily head of 7.8-3.8m, considering peak-valley electricity price and with 100% loads, the cost saving of water pumping per unit was -3.58%~-2.14% compared with operation in rating state, which showed that the optimization effect could not counteract the energy loss carried out by frequency converter. While under 80% and 60% loads, the optimization effect was obvious and the cost saving was 11.38%-15.71% and 24.79%-29.17% respectively. Under the average daily head of 7.8~3.8m, without considering peak-valley electricity price, the optimal operation had some benefits only under the low heads and with small operation loads(such as 5.8 m and 60% loads; 4.8 m and 80% loads; 3.8 m and 60% loads). While under the other heads and loads, the optimization effect could not counteract the energy loss carried out by frequency converter. The results can provide a new way for optimal operation of large-scale pumping station influenced by tides for multiple pump units with variable speed.

Number of references:15

Main heading:Integer programming

Controlled terms:Costs - Electricity - Electron energy loss spectroscopy - Energy dissipation - Flood control - Frequency converters - Landforms - Optimization - Pumping plants - Pumps - Speed - Tides - Water distribution systems - Water supply

Uncontrolled terms:Experimental optimization - Linear integer programming - Peak-valley electricity price - Pumping stations - Variable speed

Classification code:931.1 Mechanics - 921.5 Optimization Techniques - 911 Cost and Value Engineering; Industrial Economics - 801 Chemistry - 705.1 Electric Machinery, General - 701.1 Electricity: Basic Concepts and Phenomena - 618.2 Pumps - 525.4 Energy Losses (industrial and residential) - 481.1 Geology - 471.4 Seawater, Tides and Waves - 454.1 Environmental Engineering, General - 446.1 Water Supply Systems - 446 Waterworks

DOI:10.3969/j.issn.1002-6819.2011.05.027

Database:Compendex

Compilation and indexing terms, Copyright 2011 Elsevier Inc.

Accession number:20111913961515

Title:Synthesis, crystal structures and characterization of four coordination polymers based on 5-amino-2,4,6-triiodoisophthalic acid

Authors:Zhang, Kou-Lin (1); Chang, Yan (1); Zhang, Jing-Bo (1); Yuan, Li-Min (2); Deng, Ye (1); Diao, Guo-Wang (1); Ng, Seik Weng (3)

Author affiliation:(1) Key Laboratory of Environmental Material and Environmental Engineering of Jiangsu Province, College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China; (2) Test and Analysis Center, Yangzhou University, Yangzhou 225002, China; (3) Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia

Corresponding author:Zhang, K.-L.([e-mail])

Source title:Journal of Solid State Chemistry

Abbreviated source title:J. Solid State Chem.

Volume:184

Issue:5

Issue date:May 2011

Publication year:2011

Pages:1263-1272

Language:English

ISSN:00224596

E-ISSN:1095726X

CODEN:JSSCBI

Document type:Journal article (JA)

Publisher:Academic Press Inc., 6277 Sea Harbor Drive, Orlando, FL 32887-4900, United States

Abstract:One homochiral 1D coordination polymer [Cu(ATIBDC)(2,2′-bipy)] ·3H2O·CH3OH (1) and three achiral 1D coordination polymers: [Cd(ATIBDC)(2,2′-bipy)(H2O)] ·3H2O (2), [Cd(ATIBDC)(phen)(H2O)]·4H 2O (3), and [Mn(ATIBDC)(phen)2]·5H2O (4) have been synthesized and characterized (H2ATIBDC=5-amino-2,4,6- triiodoisophthalic acid, 2,2′-bipy=2,2′-bipyridine, and phen=1,10-phenanthroline). Extended high dimensional network architectures are further constructed with the help of weak secondary interactions, such as hydrogen bonding, aromatic stacking, and halogen bonding (CI...π and CI...N/O). Complex 1 crystallizes in the monoclinic system with chiral space group P2(1) and exhibits a right-handed 21 helical chain structure. The homochirality of 1 was confirmed by CD spectrum. Interestingly, two new configurations of decameric water cluster are found in 3 and 4. The acyclic tetrameric cluster (H2O)3(CH3OH) in 1 and (H2O)4 in 2 array into highly ordered helical infinite chains. Thermal stabilities of all the complexes have been studied. Solid state fluorescent properties of the Cd(II) complexes have been explored. © 2011 Elsevier Inc. All rights reserved.

Number of references:72

Main heading:Coordination reactions

Controlled terms:Complexation - Fluorescence - Hydrogen bonds - Manganese - Network architecture - Polymers

Uncontrolled terms:1D coordination polymer - Bipyridines - Cd complex - CD spectra - Complex 1 - Coordination polymers - Decameric water clusters - Fluorescence spectra - Fluorescent property - Four coordination - Halogen bonding - Helical chain structure - High dimensional networks - Homochiral - Homochirality - Hydrogen bondings - Infinite chains - Monoclinic systems - Phenanthrolines - Secondary interactions - Space Groups - Synthesis - Thermal stability - Water cluster

Classification code:815.1 Polymeric Materials - 802.2 Chemical Reactions - 801.4 Physical Chemistry - 741.1 Light/Optics - 723 Computer Software, Data Handling and Applications - 722 Computer Systems and Equipment - 543.2 Manganese and Alloys

DOI:10.1016/j.jssc.2011.03.050

Database:Compendex

Compilation and indexing terms, Copyright 2011 Elsevier Inc.

Accession number:20112314043722

Title:Numerical calculation and experimental research on residual stresses in precipitation-hardening layer of NAK80 steel for shot peening

Authors:Miao, Hong (1); Zuo, Dunwen (1); Wang, Min (1); Zhang, Ruihong (2); Wang, Hongfeng (1)

Author affiliation:(1) Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; (2) College of Mechanical Engineering, Yangzhou University, Yangzhou 225000, China

Corresponding author:Zuo, D.([e-mail])

Source title:Chinese Journal of Mechanical Engineering (English Edition)

Abbreviated source title:Chin J Mech Eng Engl Ed

Volume:24

Issue:3

Issue date:May 2011

Publication year:2011

Pages:439-445

Language:English

ISSN:10009345

CODEN:CJMEER

Document type:Journal article (JA)

Publisher:Chinese Mechanical Engineering Society, No.46,Road Sanlihe, Beijing, 100823, China

Abstract:Shot peening can improve fatigue strength of materials by creating compressive residual stress field in their surface layers, and offers a protection against crack initiation and propagation, corrosion, etc. And fatigue fracture and stress corrosion cracking of NAK80 steel parts are improved effectively. Currently there lacks in-depth research in which the beneficial effect of the residual stress may be offset by the surface damage associated with shot peening, especially in terms of the research on the effective control of shot peening intensity. In order to obtain the surface residual stress field of NAK80 steel after shot peening, the samples are shot peened by pneumatic shot peening machine with different rules. The residual stress in the precipitation-hardening layer of NAK80 steel is measured before and after a shot peening treatment by X-ray diffraction method. In order to obtain true residual stress field, integral compensation method is used to correct results. By setting up analytical model of the residual stress in the process of shot peening, the surface residual stress is calculated after shot peening, and mentioning the reason of errors occurred between calculated and experimental residual stresses, which is mainly caused by the measurement error of the shoot arc height. At the same time, micro hardness, microstructure and roughness in the precipitation-hardening layer of NAK80 steel before and after shot peening were measured and surveyed in order to obtain the relation between shot peening strength and surface quality in the precipitation-hardening layer. The results show that the surface quality of NAK80 steel is significantly improved by shot peening process. The over peening effect is produced when the shot peening intensity is too high, it is disadvantageous to improve sample's surface integrity, and leading to reduce the fatigue life. When arc high value of optimal shot peening is 0.40 mm, the surface quality is the best, and the depth of residual stress in the precipitation-hardening layer reaches to about 450 μm. Numerical calculation is very useful to define the process parameters when a specific residual stress profile is intended, either to quantify the benefits on a specific property like fatigue life or to help on modeling a forming process like shot peen forming. In particular, the proposed parameter optimization in the progress of shot peening and effective control of the surface texture provide new rules for the quantitative evaluations of shot peening surface modification of NAK80 steel. Copyright © 2011 Chinese Journal of Mechanical Engineering.

Number of references:15

Main heading:Shot peening

Controlled terms:Corrosion fatigue - Hardening - Mathematical models - Measurement errors - Optimization - Research - Residual stresses - Stress analysis - Stress corrosion cracking - Surfaces - X ray diffraction

Uncontrolled terms:Analytical model - Arc height - Beneficial effects - Compressive residual stress - Crack initiation and propagation - Experimental research - Fatigue fracture - Fatigue life - Forming process - Integral compensation - Numerical calculation - Parameter optimization - Precipitation hardening - Process parameters - Quantitative evaluation - Residual stress fields - Residual stress profiles - Shot peen - Shot peening intensity - Steel parts - Surface damages - Surface integrity - Surface layers - Surface modification - Surface qualities - Surface quality - Surface residual stress - Surface textures - X-ray diffraction method

Classification code:931.3 Atomic and Molecular Physics - 931 Classical Physics; Quantum Theory; Relativity - 922 Statistical Methods - 921.5 Optimization Techniques - 951 Materials Science - 921 Mathematics - 539 Metals Corrosion and Protection; Metal Plating - 537.1 Heat Treatment Processes - 421 Strength of Building Materials; Mechanical Properties - 901.3 Engineering Research

DOI:10.3901/CJME.2011.03.439

Database:Compendex

Compilation and indexing terms, Copyright 2011 Elsevier Inc.

Accession number:20112614103364

Title:Selection of nD value for low head pump system of large pumping station

Authors:Liang, Jindong (1); Lu, Linguang (1); Xu, Lei (1); Chen, Wei (1)

Author affiliation:(1) College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China

Corresponding author:Lu, L.([e-mail])

Source title:Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering

Abbreviated source title:Paiguan Jixie Xuebao.

Volume:29

Issue:3

Issue date:May 2011

Publication year:2011

Pages:236-240

Language:Chinese

ISSN:16748530

CODEN:PAJIE2

Document type:Journal article (JA)

Publisher:Editorial Department of Drainage and, 30 Mengxiyuan Lane, Zhenjiang, 212003, China

Abstract:The influence of reducing nD value on hydraulic performance of a large pump system with low head was discussed from the point of view of pump type selection, energy performance and cavitation performance, and the design idea of reducing nD value for the pump system was put forward. The consistent relationship between reducing nD value and increasing impeller diameter and reducing pump speed was derived according to the affinity law of pumps. If the pump diameter increases by 5% under the condition of a certain design discharge, the pump speed and nD value will decrease by 13.6% and 9.3%, respectively. The effect of reducing nD value on increasing pump system efficiency was analyzed from the point of view of influence of impeller diameter on the conduit hydraulic loss. Based on the relation between nD value and pump head, it was put forward to reduce nD value for selecting the more excellent axial pump hydraulic model under the condition of low head. According to the cavitation affinity law of pumps, the influence of reducing nD value on the cavitation performance of the pump system was analyzed. Meanwhile examination index for the cavitation performance of the pump system and the influence of increasing impeller diameter and reducing pump speed on the conduit control sizes and equipment investment were also discussed. The research results indicate that if the pump diameter increases from 2.9 m to 3.1 m for a pump system with the average head of 4 m and single pump design discharge of 33.5 m³/s the conduit efficiency will increase by 2.9%. If the nD value decreases from 435 to 387.5 under the condition of a certain design discharge, the pump head at the high efficiency zone of the hydraulic model TJ04-ZL-06 will lower from 5 m to 4 m and the pump NPSHR will reduce by 20.6%. It suggests that a lower nD value should be adopted for a large pumping station with low head and long running operation time.