Zhang H.,Wenzhou University |
Hu X.,Wenzhou University |
Shao S.,Zhejiang Education Institute
Journal of Chemical and Engineering Data | Year: 2010
The dilution enthalpies of L-alanine in dimethylsulfoxide (DMSO) + water and dimethylformamide (DMF) + water mixtures at 298.15 K have been determined, respectively, using an isothermal titration calorimeter. On the basis of the McMillan-Mayer theory, the homochiral enthalpic interaction coefficients h XX of L-alanine in both of the mixtures of various mass fractions (w2) 0 to 0.3) have been calculated. It was found that hXX is positive at lower DMSO or DMF concentrations, but it becomes less positive and even negative with the increasing concentration of DMSO or DMF. The results were interpreted from the point of view of solute-solute interactions mediated by these two aprotic cosolvents. © 2010 American Chemical Society.
Yan X.,Zhejiang University |
Zhou M.,Zhejiang University of Technology |
Chen J.,Zhejiang University |
Chi X.,Zhejiang University |
And 6 more authors.
Chemical Communications | Year: 2011
Driven by the benzo-21-crown-7/secondary ammonium salt recognition motif, a linear supramolecular polymer was formed from self-organization of a low-molecular-weight self-complementary monomer in chloroform. From this supramolecular polymer, nanofibers were obtained successfully via electrospinning. © 2011 The Royal Society of Chemistry.
Tian Y.,Tianjin University |
Tian Y.,Zhejiang Education Institute
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2010
Based on analyzing the guideline of location selection for critical material reservoirs, the thesis targets at establishing an indicator system of location selection for critical material reservoirs by adopting the Delphi method. By adopting the AHP analysis-structure-chart method, the thesis presents a structure chart of an indicator system to evaluate the location selection of critical material reservoirs. Furthermore, the thesis applies the FAHP method and the 0.1~0.9 measurement to construct a fuzzy supplementary judgment matrix and to testify its compatibility and consistency, which jointly contribute to the establishment of an effective measurement system for critical material reservoirs in a collective decision making progress. Through conducting survey and analysis on six tentative location selection plans, this thesis comes to an conclusion that it is both scientific and feasible to select locations for critical material reservoirs on the basis of the theoretical model hereby provided in this thesis.
Lu G.,Zhejiang University of Finance and Economics |
Huang P.,Zhejiang University |
He L.,Zhejiang University of Finance and Economics |
Cu C.,Hangzhou Dianzi University |
Li X.,Zhejiang Education Institute
WSEAS Transactions on Computers | Year: 2010
Word semantic similarity measurement is a basic research area in the fields of natural language processing, intelligent retrieval, document clustering, document classification, automatic question answering, word sense disambiguation, machine translation, etc.. To address the issues existing in current approaches to word semantic similarity measurement, such as the low term coverage and difficult update, a novel word semantic similarity measurement method based on web search engines is proposed, which exploits the information, including page count and snippets, in retrieved results to do calculation. The proposed method can resolve the issues mentioned above due to the huge volumes of information in the Web. The experimental results demonstrate the effectiveness of the proposed methods.
Gong Y.,Hangzhou Dianzi University |
Bian X.,Zhejiang Education Institute |
Chen G.,Hangzhou Dianzi University
Applied Mechanics and Materials | Year: 2012
This paper explains and demonstrates how to construct integration simulation model of exavtor operator based on modelica language. The paper firstly introduce the history of modelic language and application in production design; secondly the paper construct exavtor operator dynamics model by D-H method and construct operator's modelica model by dymola soft; then the paper analyse the hydraulic system of operator, and construct hydraulic simulation model which integrate to operator mechanism system; at last the paper gives simulation results of vauious operating mode. Because of consideration in coordination of mechanism and hydraulic of operator,the simulation results approach actual working process,and improve the exavtor's design efficiency and reliability. © (2012) Trans Tech Publications, Switzerland.
Gong Y.-P.,Hangzhou Dianzi University |
Bian X.-J.,Zhejiang Education Institute
ICIC 2010 - 3rd International Conference on Information and Computing | Year: 2010
Traditional clutch design method adopts "design-preproduction- test" process, which not only spends large manpower, money, and design time, but also there is some dangerous test in this design method. The paper built automobile clutch virtual simulation design system platform according to the automobile clutch design and manufacturing process, the platform adopt numerical functional prototype model technology, can built the clutch assembly virtual simulation model, the model can simulate the clutch's working process, and complete kinds of virtual test of comprehensive performance criterion of clutch, reappeared the problems in clutch working process. © 2010 IEEE.
Tong W.,Zhejiang University |
Zheng Q.,Zhejiang University |
Shao S.,Zhejiang Education Institute |
Lei Q.,Zhejiang University |
Fang W.,Zhejiang University
Journal of Chemical and Engineering Data | Year: 2010
The micelle formations in aqueous solutions of a set of quaternary ammonium surfactants, N-alkyl-N-2-hydroxyethyl-N,N-dimethyl ammonium bromide (C nHDAB, n = 12, 14, and 16), N-alkyl-N,N-2-dihydroxyethyl-N-methyl ammonium bromide (C nDHAB, n = 12, 14, and 16), along with N-dodecyl-N,N,N-trimethyl ammonium bromide (DTAB), and N-cetyl-N,N,N-trimethyl ammonium bromide (CTAB), were investigated by the isothermal titration calorimetry (ITC). The critical micellar concentrations (CMCs) and the enthalpies of micellization at six different temperatures were determined. The entropies and Gibbs free energies of micellization were then calculated by using the pseudophase separation model. The effects on the thermodynamic data of the temperature, the length of the alkane chain, and the number of hydroxyethyl substituents on the surfactant headgroup were discussed. The CMC value of each surfactant increases slightly with the temperature increase. At a given temperature, both the increases of the length of the alkane chain and the number of hydroxyethyl substituents lead to the decreases of the CMC values. © 2010 American Chemical Society.
Ma X.,Zhejiang Education Institute
Proceedings - International Conference on Artificial Intelligence and Computational Intelligence, AICI 2010 | Year: 2010
In this paper, we propose a new two-stage estimation (TSE) method for estimating parameters in two species predator-prey model. In the first stage, we use the hidden periodical model in time series analysis to fit the state variable and their derivates, since the solutions to the predator-prey model have periodical properties. To consider the properties of the solutions to the ordinary differential equation (ODE) is ignored by all of the research in parameter estimation for ODE so far. And then the parameter estimation for ODE is transformed into a linear regression model. So the second stage is just an ordinary regression analysis. Our new TSE don't need numerical solve the ODE and is easy to be carried out. Especially, we can obtain the interval estimation of the parameters that is also ignored in most research up to now. The simulation study show that the relative errors of the point estimates is great smaller than the published results (eg, see[2, 3]) and our method is suitable from the view point of statistics. © 2010 IEEE.
Liu M.,Zhejiang University |
Yan X.,Zhejiang University |
Hu M.,Zhejiang University |
Chen X.,Zhejiang University |
And 5 more authors.
Organic Letters | Year: 2010
A new azobenzene-bridged cryptand was synthesized; it can be well controlled between cis and trans isomers by irradiation with different wavelengths or by being heated. It was found that this cryptand exhibits an ON-OFF binding ability with 2,7-diazapyrenium (DAP) derivatives. It binds DAP derivatives as the cis isomer only, as demonstrated by various methods. The fluorescence property of DAP derivatives endows these host-guest systems with detectable fluorescent output signals, which makes monitoring these photoresponsive systems convenient. © 2010 American Chemical Society.
Wang Z.-W.,Zhejiang Education Institute
2010 3rd IEEE International Conference on Ubi-Media Computing, U-Media 2010 | Year: 2010
A concept of distributed RFID System is proposed, which can be agilely integrated into Ubi-Media environment The system consists of RFID tags, MF RC522 RF based tag-reading/writing module, controlling unit using MSP430 as MCU, communication network between RFID nodes, and backend DBMS. The communication network employs ZigBee WSN to realize the wireless RFID node setting that is wiring free and more allocation flexible. The features of ZigBee and its applying feasibility in the situation are discussed. The system structure and its main modules are briefed. The ZigBee network and its node design are described. The ZigBee node adopts CC2420 as RF chip and ATMEGA128L as MCU. The selectable RFID tags are discussed. Mifare 1 S50 tags are currently used in the experimental system and its reader/writer unit design introduced. The system prototype has been built and tested at a limited scale and its basic functions (simulating a laboratory access controlling) realized. After proper adaptation, the application of this schema could be extended to user identifying, Ubi digital devices powering on/off and media content event driving to support more intelligent Ubi-environment. © 2010 IEEE.