bluuebunny/crossref_metadata_2025 huggingface dataset:
A Design and Realization on Quantitative Measurement and Evaluation System for Teaching Effectiveness in Middle and Primary School
Authors: Hu Zhi Hong , Yang Hua Qian
Published: May 2011

According to China's traditional teachers’ quantitative evaluation ideas and experiences about their education teaching effectiveness, learning from advanced measurement concepts and models home and abroad, to design an open, scientific quantitative evaluation system for the teachers’ teaching effectiveness. The measurement indicators, the evaluation main body of the System and its weight in the process of measurement can be for different objects to customize settings.
Preparation and Antibacterial Activity of Al2O3-ZrO2 Carrying Ag+
Authors: Tian Xiu Shu , Lv Chen Jing , Zhang Guang Lei
Published: May 2011

A group of new composite antibacterial agent was prepared by ion adsorption method, in which silver ion is the main active ingredient, with alumina and zirconia as the carriers. The influence of mixing time, content of zirconia, silver ion content and calcination temperature on the antibacterial properties of the composite powder are discussed in this paper. The results show that when the content of ZrO2 is 4%, Ag+ content is 4%，mixing temperature is 70°C，mixing time is 4h, the composite antibacterial agent has a good property. ZrO2 can be loaded in the large hole of Al2O3 as a second carrier; it can keep a larger surface area-based carrier, suitable pore structure, and also play an important role on antibacterial properties at high temperature.
The Fuzzy Comprehensive Assessment of Brand Competitiveness of Property Insurance Companies
Authors: Song Shao Fu , Li Guang Jin , Su Ying Sheng
Published: May 2011

This paper presents a practical assessment of brand competitiveness in property insurance industry through Fuzzy Comprehensive Assessment. The multicriteria evaluation model and weighting matrix have been determined by the Analytic Hierarchy Process (AHP). The synthetically appraisal score of property insurance companies can be estimated by Fuzzy Comprehensive Assessment, which contains a two-stage decision. At the end of this paper, three listed property insurance companies have been evaluated following the above methods.
Preparation of Electrospinning Polystyrene Nanofibrous Membrame and Nanofiltration for Simulated Dyeing Wastewater
Authors: Yang Zuo Yi , Ning Xu Nan , Wang Han , Liu Jing Yong
Published: May 2011

In this thesis, polystyrene nanomembranes made by electrospinning technique were utilized to deal with Cu2+(5mg/l), Cr6+(5mg/l) and methylene blue (10mg/l) contained in simulated dyeing wastewater. Polystyrene liquor (8% (m/m), dissolved in chloroform) was electrospun and processed nanofibrous membrane; the nanofiber diameter was 250nm~15µm; the detected pore size was 3nm~0.5µm and the membrane thickness was 170µm. A plate membrane system was used to test nanofiltration characteristics of pollutants (Cu2+, Cr6+ and methylene blue). The experiment showed that the interception rates were above 91%, and the water flux was about 5.8-15.4ml/ (cm2h).
Key Substitution Attack and Malleability of a Short Signature Scheme with Batch Verification
Authors: Kong Fan Yu , Yu Jia
Published: May 2011

At IWSEC 2008, F. Guo et al. proposed an efficient short signature scheme with batch verification based on C. Gentry’s scheme. In this paper, we firstly propose the key substitution attack on F. Guo et al.’s digital signature scheme and show that the malicious adversary can forge a valid signature, which can be verified with a substituted public key. Secondly, we prove that F. Guo et al.’s scheme is malleable and the attacker can produce a new valid signature on the message if he/she has known some valid signatures on the same message.
The Role of Footwear on Plantar Pressure Performance during Badminton Movements
Authors: Fu Wei Jie
Published: May 2011

In this investigation, we focus on three most frequently applied badminton footwork and analyze relations among the features of intensity of pressure, distribution of pressure, and the mean maximum pressure during the movements in order to improve technique and give available suggestions on footwear design and lower-extremity injury prevention. All subjects (N=10) performed three typical footwork movements: Left Front-court Lunge Steps (LFLS), Right Front-court Lunge Steps (RFLS), and Rear-court Revolve to Jump (RRJ) with the peak pressure and distribution of pressure collected by Medilogic insole measurement (300Hz) simultaneously. Due to the characteristics of footwork, the whole period was subdivided into two phases to be analyzed: toe-off (TO) and touch-down (TD). The results indicated that the metatarsal heads and lateral of heel proved to be the most contacting regions with the surface. Therefore, different areas of outsole should be designed with different materials respectively so as to disperse pressures. Stability for rear foot and ankle joint should be enhanced in terms with the shoe design in order to prevent potential lower-extremity injuries.
Research on Variable Time-Domain Discrete Interpolation Control in Flexible Roll Forming
Authors: Wang Gui Yong , Qian Bo , Li Qiang , Yan Yu
Published: May 2011

Due to the complex motion control in flexible roll forming when processing the sheet metal with variable cross-section, it is required for high real-time and high precision control during the processing. Controlling servo motor by adopting the configuration programming is a common approach to achieve roller motion, but it will not be able or difficult to realize by the configuration programming for complex contour sheet metal without the rules such as hyperbolic, or the molding product in non-symmetric cross-section shape, etc. Based on the process characteristic of flexible roll forming and its motion control technology, this paper adopts the variable time-domain discrete interpolation control method to process the variable cross-section sheet metal. Experiments indicate that this control method provides a good operating method for the sheet metal forming with complex variable cross-section shape in flexible roll forming.
Analysis on Biohealth Function of Dried Pinus Biomass by TD-GC-MS
Authors: Pang Yan , Wang Zhong Wei
Published: May 2011

In order to evaluate its potential health risk to human, the volatiles of the dried Pinus biomass were adsorbed and determined by TD-GC-MS. And the main constituents of volatiles at 210°С were 1,4-methanoazulene, decahydro-4,8, 8-trimethyl-9-methylene-(11.75%), acetic acid (6.38%), 1,4-methanoazulen-3-ol, decahydro-1,5,5,8a-tetramethyl-(5.76%), 1r-.alpha.-pinene (5.18%), 1-phenanthrenecarboxaldehyde, 7-et henyl-1,2,3,4,4a,4b,5,6,7,9,10,10a -dodecahydro- 1,4a,7-trimethyl-(4.78%), 2-furancarboxaldehyde, 5-(hydroxym ethyl)- (4.39%), 2-methyliminoperhydro-1,3-oxazine (3.67%), 1,3-benzodioxole, 5-(2-propenyl)- (3.33%), etc. So the dried Pinus biomass had biohealth function.
Dynamical Simulation about Buffer Packaging of Computer
Authors: Zhang Guo Qing , Huang Jing , Lin Hai Bo
Published: May 2011

A host computer packaging cushion is designed, including deflection, buffering capacity, creep checking. Then g a three-dimensional model of the host buffer packaging systems is established Simulation of the system, including static analysis, modal analysis, harmonic analysis and transient dynamic analysis. Finally, the physical system is used to do the sine frequency, fixed-frequency sinusoidal vibration test. the vulnerability of the buffer package sinusoidal frequency calculate by the computer modal analysis larger than the resonance frequency of the measured test values This is due to host the actual shell of the computer by each side made of thin steel plate riveting, and list them in the computer simulation as a whole in the shell, so that the overall stiffness of the system become larger, so that the analysis of the inherent frequency than the actual value. Transient dynamic analysis of the computer meets the fixed-frequency sinusoidal test results，which are all happened in the prophase of vibration in the balance position. This vibration last a period causing fatigue, so that the acceleration package increases slowly and the product damage.
Synthesis and Characterization of Copper/Paraffin Nanocomposites for Thermal Actuation
Authors: Xu Bin , Lou Bai Yang
Published: May 2011

The copper/paraffin nanocomposites were synthesized by high energy ball milling. Observation of the microstructure, comparison and ascertainment of the particle size of the composite were analyzed by transmission electron microscope. Then the composite was put into a home-made copper tube (5 mm in diameter, 20 mm in length, closed at one end) by thermoforming process, and its thermal sensitivity was measured using thermo-controlled optical micro measuring equipment. The effects of milling time on the microstructures and the thermal sensitivity of copper/paraffin nanocomposites were investigated. The results showed that different milling time caused the changes in particle size and shape of the composite, and had a significant effect on its thermal sensitivity. With increasing milling time, the thermal sensitivity of composite gradually increased.
The Influence of Micro-Arc Oxidation on Corrosive-Wear Behavior of Magnesium Alloy
Authors: Lou Bai Yang , Liang Bao , Li Xiao
Published: May 2011

Using an alternative pulse current source and in silicate solution electrolyte，a uniform coating on the surface of AZ9lD alloy was fabricated by micro-arc oxidation(MAO) with current density of 40mA/cm2. Friction wear testing machine was used to study the wear behavior under corrosive environment of the film and scanning electron microscopy(SEM)were used to study microstructures of film and worn surface．The result shows that the corrosion resistance of micro-arc oxidation film is large better than that of magnesium alloy. The corrosive solution great weaken the abrasion resistance of the coating. As the influence of the corrosive solution, the wearing mechanism is varying with the loading. Abrasive wear is the main mechanism when the loading is small, if the loading is large enough, the binding force will be destroyed and the coating will peel off from magnesium alloy.
Study on Field Emission Characteristics of Normal-Gated and Under-Gated Carbon Nanotube Cold Cathode
Authors: Wang Qing , Dang Wen Qiang , Mu Xiao Wen , Dai Jian Feng , Li Wei Xue
Published: May 2011

Based on the classical electrostatic theory, the distributions of potential and electrical field at the apex of the carbon nanotubes (CNTs), both in normal-gate type triode structure and under-gate type triode structure, were simulated and calculated respectively. The gate electrode's position and gate aperture's effect on CNTs' field emission characteristics were analyzed. The results indicate that under-gate structure, compared with normal-gate structure, has better field emission performance and lower threshold voltage. Both the gate aperture and the distance between gate electrode and CNTs' apex have crucial effect on field enhancement factors of normal-gate structure and under-gate structure.
Study on Geological Reserves Calculation Based on 3D Entity Model
Authors: Wu Hui Xin , Chang Cheng Guo
Published: May 2011

In order to overcome some technical problems in 3D modeling and model interaction operation, a new geological reserves calculation method is proposed based on 3D entity model. Firstly, this paper discusses how to infer and link mine rock boundary lines and generate geological profile map with it the 3D entity model of ore body can be constructed. Then, the principle of geological reserves calculation is discussed in detail. The calculation results show that this method is of characteristic of high precision and easy operation compared with the traditional empirical formula and provides a new operation and design platform for engineering designers.
Numerical Simulation and Experimental Study of Static Driven Short Piles in the Dualistic Structure Stratum
Authors: Zhang Xin Gui , Kong Xiang Gang , Song Zhen
Published: May 2011

In this paper, based on measured data of practical engineering, the characters of single short pile under the static vertical load action in the normal stratum combination model of dualistic structure has been simulated by using ABAQUS finite element software. Then simulated result and measured one has been compared and analyzed carefully. The analysis result indicated the applicability and reliability of ABAQUS finite element software in the simulation analysis of short pile. All these can provide some theoretical reference for design of short pile foundation.
Plasticity Model of Extruded Peanuts under Mechanical Pressing
Authors: Zheng Xiao , Zhang Ya Xin , Lin Guo Xiang , Sun Zhi Xian
Published: May 2011

The experiments for stress—strain and confined pressing of granular peanuts by uniaxial pressing were carried out. The results show that granular peanuts conform to the model of three power curve. By using of Kuhn`s yield criterion, plasticity constitutive equations of granular peanuts were developed. The model parameters were determined from experimental stress—strain curve using an inverse method. The maximum relative deviation between the measured and the simulated value of strain is 5.4%, and the average relative deviation is 3.5%. Results indicated that the plasticity constitutive equations can describe the plastic deformation for extruded peanut, and Kuhn`s yield criterion can be used as theoretical basis for plasticity model of granular peanuts.
Vibration Analysis of Train and Truss Girder Bridge
Authors: Yang Shi Ruo
Published: May 2011

Vibration analysis of steel truss bridge is required by promotion in the speed of train. The train and the truss girder bridge are coupled together as one composite system. Truss girder bridge is idealized as an assemblage of finite truss element. The vehicle space vibration model of two-stage suspension is used, which has 26-degrees of freedom. The equations of the train and truss girder bridges time varying system are set up by using the principle of total potential energy with stationary value in elastic system dynamics and the“set-in-right-position”rule for forming structural matrices. This method is more convenient than the finite elements. The vibration responses of train and bridge are calculated when the trains pass through a truss girder bridge at different speeds. The results show that the bridge has sufficient lateral and vertical stiffness.
Using Database Technology to Design the Computer Management System of University's Sports Meeting
Authors: Zhang Kun
Published: May 2011

With the development of setting up the optimal and rational management system of university sports meeting, combining with practice and following the design steps of the database development, to design a modern management system of university sports.
A Kind of Reconfigurable Information System Based on Component
Authors: Zhao Ni , Li Xun
Published: May 2011

Continuous change of business environment of information system requires it timely respond and support these changes. A major challenge faced by information system is system reconfiguration, namely capability to quickly respond to changes of the system. Based on description of the concept of reconfigurable information systems, the idea of component was introduced into design and implementation of Reconfigurable Information System (RIS). Overall architecture and implementation method of reconfigurable information system based on component was analyzed in detail. Specific design of RIS based on component was provided combining with design and development of specific document transmitting system based on CORBA middleware platform.
Feature Extraction Accuracy Improvement of Acoustic Signals Based on Reassigned Wavelet Scalogram
Authors: Li Pan , He Ping , Sun Hui Qi , Shang Wei , Sun Nan Xiang
Published: May 2011

Based on the wavelet scalogram obtained by Morlet wavelet transform and hard threshold de-noising filtering for typical acoustic emission signals, region segmented location method is introduced to get the number and accurate values of the characteristic frequencies, therefore the error induced by misjudgment and misreading can be avoided effectively. Then considering the weakness of large characteristic frequency error in Morlet wavelet scalogram, the feature extraction accuracy has been improved by combing region segmented location method and reassigned wavelet scalogram. Simulation results show that the proposed method has the merits of well rapidity, high reliability and briefness, hence can realize high precision feature extraction and has great practical value.
A Study on Boundary Modeling of Three-Dimensional Discrete Element Method Based on Pro/ENGINEER
Authors: Yan Hui , Yu Jian Qun , Kou Xing Xing
Published: May 2011

This paper presents a new method that use the library function offered by Pro/TOOLKIT and on account of Visual C++ development platform to achieve the recognition of Pro/ENGINEER solid model of mechanical components and extraction of geometry information. Motion attribute is set according to requirements, and analytical mode of three-dimensional discrete element method is built, therefore, Pro/ENGINEER software and the performance analysis software of three-dimensional discrete element method developed autonomously are integrated. A kind of new method and new tool is offered to three-dimensional discrete element method performance analysis and optimization design, and three-dimensional discrete element method belongs to relevant mechanical components contacted and acted with granular materials. What’s more, the correctness and effectiveness of boundary modeling method of three-dimensional discrete element method and developed software are tested and verified through real examples.
Application of Nonparametric Kernel Density Estimation in Hongkong Stock Market
Authors: Wang Yu Ling , Wang Jing
Published: May 2011

A new method, non-parametric kernel density, is used to research the distribution function of HangSeng index returns. The new method can not only depict the character of peak and fat tails of stock returns, but also capture the market risk better than normal distribution. Further more, more accurate conclusions are concluded.
Spectrum Features of Leakage Current on Contaminated Insulators
Authors: Hui Ali
Published: May 2011

As the improve of voltage class in power system and the aggravation of industrial pollution, flashover of contaminated insulators in HV and UHV system is growing, imperiling the security of power system severely. The linchpin of enhancing the security of system is excavating ways of monitoring status of insulator’s surface by some eigenvalues. In this paper, distinctive spectrum features of leakage current(LC) are computed, including power spectrum and bispectrum. The results show that bispectrum depicts the information of arc discharge in LC more valid than power spectrum, which is a good eigenvalue for flashover identification and risk predictions.
Based on the Theory of Thin-Walled Bar Flexure-Torsion Analysis of the Oblique Combined Structure
Authors: Yuan Dong Xia , Han Xiao Bin , Hu Qi Ping , Zhou Li Peng
Published: May 2011

This paper assumes that a row of the frame, shear wall structure as affected by lateral bending and torsion modules coupling effect of thin-walled members, through the floor to work together to establish a collaborative analysis of structural bias of the Hamiltonian on the dual system, with precise integration method for the numerical solution of high-precision systems, analysis of bias is given a set of construction the structure of collaborative work. The results make the structure more in line with the actual deformation.
Thermal Performance Prediction of a Finned Plain-Plate Heat-Pipe for LED Lamp
Authors: Xie Xu Liang
Published: May 2011

In order to keep the temperature of Light emitting diode (LED) lamp below some limitation, a finned plain-plate heat-pipe was presented and numerically investigated to predict heat transfer performance under natural convection. Two kinds of fin configurations were studied. It is found that 30° is the worst orientation for the fin configuration with the tops of every other two channels covered, while the worst orientation is around 60° for the fin configuration with channel tops opened. The thermal conductivity of fin material only has mild effect on the cooling capacity with 7 % difference when its thermal conductivity varies from 50 to 200 W/(m·k). The latter configuration has better thermal performance than the former at the same orientation, especially at relatively low inclined angle.
Clustering Approach to Construct Knowledge Management for Statistics Concepts of University Students
Authors: Lin Yuan Horng , Yih Jeng Ming
Published: May 2011

The purpose of this study is to develop a methodology as to the knowledge management of concept structure for learners. Fuzzy clustering is adopted to implement classification so that learners of the same cluster have homogeneity and display common features of cognition diagnosis. In addition, fuzzy clustering is based on information of concept scoring and caution index from polytomous student-problem chart. In the study, the empirical data is the assessment of statistics concepts from university students. The results show that there are four clusters and each cluster has its own cognitive characteristics. To sum up, the methodology can improve knowledge management in classroom more feasible. Finally, some recommendations and suggestions for future investigations are also discussed.
The Vibration Characteristics Analysis of Ship Foundation Based on the Arrangement of Isolators
Authors: Wang Yu , Chen Xing Lin , Li Guang Min
Published: May 2011

Contrary to the general connection style, the vibration characteristics of the ship foundation vibration is researched under the arrangement style of isolators acted on it. And the influence of the parameters of rigidity and damp to the excitation force characteristic is studied too. Based on the real ship data and the finite element method, the study is shown that the excitation force from the device to the foundation is not only related to the rigidity, damp of isolators and the natural frequency of device-isolator-foundation system but also the related to arrangement style of isolator. When the excited frequency is lower it had little effect on the vibration characteristics relatively. However that the frequency is higher, it had significant effect on the vibration.
The Worm Transmission with Inconstant Addendum
Authors: Liu Hu Ran
Published: May 2011

The concept of worm transmission with inconstant addendum is presented in this paper. Compared with the ordinarily cylindrical worm transmission, the contact area is increased dramatically. With these advantages, it is hopeful to substitute the Double Envelope Hourgrass worm gear transmission.
A Measurement of Vehicle Attitude Using Single Tri-Axial Acceleration Transducer Based on ANN
Authors: Wu Li Ming , Zhang Li Kai , Wang Yang
Published: May 2011

Vehicle bodywork attitude measurement has been important in automotive technology. This paper presents a non-gyro bodywork attitude measurement program. Using a three-axis acceleration sensor output real-time body posture through BP neural network. Program skillfully made physical model and the algorithm simple according to the characteristics of motor cars. Taking advantage of the nonlinear function learning and generalization ability of ANN, the system made the input three-axis inertial acceleration values of harmful components filtered so as to mapoutput Attitude. And finally, it presents the data of experiments. By taking full advantage of ANN which precessing in parallel, and good at dealing with problem uncertainty, this program provides a solution of calculating real-time bodywork attitude, while with minimal hardware overhead.
Researched on the Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to Aqueous Change with the APF in Regular Way: an Approach of Quantum Electrochemistry
Authors: Pan Li Hua , Yang Rui Cheng
Published: May 2011

The corrosion resistance of Ni-Cr-Mo-Cu alloys designed by formula APF=4Cr/(2Mo+Cu) to aqueous depend on the APF is investigated. The cathodic current of corrosion reactions was expressed as the quantum electrochemical equation. It is discussed that the APF controls the corrosion resistance to aqueous.
Study on Properties of Recycled Fiber from Waste Newspaper / PLA Composites
Authors: Li Hui , Tong Zhuo , Cheng Fang , Li Xin Gong
Published: May 2011

Prepare composite materials with recycled fibers from waste newspaper and PLA by inject-molding process, and study on recycled fiber of the modified-property treatment of silane coupling agent and alkali deinking treatment influence properties of composite materials. It is found out that, recycled fibers under the modified-property treatment of silane coupling agent and under alkali deinking treatment can effectively improve compatibility between recycled fibers and PLA, and improve mechanical properties and water absorbency of composite materials.
Numerical Simulation of Welding Residual Stress and its Creep Strain for Cr5Mo Steel Welded Joint
Authors: Cheng Ling , Chen Zheng Nan , Gao Jian
Published: May 2011

By the finite element analysis codes ABAQUS and the function of RESTART, a sequential coupling calculating program for creep based on welding residual stress has been developed by establishing the model of temperature field, residual field and creep analysis. The welding residual stress and creep of welded joint for Cr5Mo furnace tubes was simulated by the program. This method established the basis for calculating the effects of welding residual stress on the creep of welded joint. A creep comparison between the welded joint tubes with welding residual stress and with internal pressure was made in the paper. The results show that although the residual stress is greatly decreased due to the creep relaxation behavior at high temperature, the initial welding residual stress has a great influence on the tube creep. The research results provide a reference for strength design of high temperature components.
Research on the Analysis Method of Magnetic Field in the Axial Magnetic Drive Mechanism
Authors: Mei Shun Qi , Xu Qiao , Zhang Zhi Ming , Liu Qing Song
Published: May 2011

The numerical analysis and calculation of magnetic field is one of the key issues for designing the magnetic drive mechanisms. This paper discusses the method of finite element analysis of the magnetic field based on ANSYS software, analyzes and simulates the magnetic field in the axial magnetic drive mechanism of the latest textile twisting spindles by means of ANSYS, analyzes and calculates the magnetic induction intensity, magnetic field intensity distribution with the different thickness of the air gap between the drive rotor and driven rotor, and the different quantity of magnets. The analysis method and results can provide reference for the design of magnetic drive mechanisms.
Quality Inspection and Analysis of Workpiece Surface in A3 Steel Machining
Authors: Zeng Qi Yong , Wu Kai , Zheng Xiao Feng , Zhu Ming
Published: May 2011

Quality characteristics of steel workpiece and their inspection methods are introduced, and the influencing factors of surface quality are analyzed by quality tools. A set of inspection scheme for cutting temperature and cutting force on-line monitoring is worked out. Thin film thermocouple technology was introduced to measure the dynamic temperature which affects the surface quality characteristics of steel workpieces. A system for measuring cutting temperature and cutting force has been developed. A high speed data acquisition card ADlink PCI-9118HG is used to acquire the temperature and force signals. Simple and friendly human-machine interface was programmed with the application of VC++ technology and Tchart controllor to achieve real-time data acquisition, display and analysis of cutting temperature and cutting force. It was concluded from the experiment that the data acquisition and measuring system is easy and flexible to use.
Research on Dynamic Wear of Revolution Joint with Clearance for Mechanical System
Authors: Bai Zheng Feng , Zhao Yang
Published: May 2011

In order to study the dynamic wear of revolution joint with clearance in mechanical system, the dynamic model of mechanical system with joint clearance is presented. The clearance model is established based on clearance vector model. The contact dynamic model in joint clearance is established using the nonlinear equivalent spring-damp model and the friction effect is considered by using correction Coulomb friction model. And then the models are incorporated into dynamics simulation software ADAMS, the dynamics model of mechanical system with joint clearance is established based on ADAMS and the simulation is made. Furthermore, the contact dynamics parameters are drawn and calculate the wear volume of joint clearance based on Archard’s wear model. Finally, a crank follower mechanical system is used to perform the simulation and the dynamic wear characteristics are analyzed.
Development and Application of Tandem LC-MS Method for the Determination of Paralytic Shellfish Poisoning Toxins for Pollution Monitoring
Authors: Zhang Xiao Ling , Feng Bing , Cai You Qiong , Yu Hui Juan
Published: May 2011

In the present study, the development of the tandem liquid chromatography-mass spectrometry (LC-MS) method for the sensitive and selective determination of eight paralytic shellfish poisoning (PSP) (GTX1, GTX2, GTX3, GTX4, GTX5, dcGTX2, dcGTX3 and dcNEO-b) toxins was investigated. Various experimental factors affecting the pretreatment and LC-MS procedures were optimzed, respectively. Using slected reaction monitoring (SRM) mode in LC-MS analysis, the acquired calibration curves were strictly linear with the value of r2 more than 0.996 for the eight targeted analyses. The obtained data expressed as relative standard deviations (RSDs), for the within-laboratory reproducibility and repeatability were less than 6.9% and 7.9%, respectively. The feasibility of the proposed method was finally validated by analyzing the eight PSPs in shellfish samples from diverse Chinese sea areas for the quality assurance of the aquatic producs and enviroment protection monitoring.
Displacement Back Analysis Based on Differential Evolution Algorithm in Metro Station Engineering
Authors: Jiang An Nan , Wang Jun Xiang
Published: May 2011

In this paper differential evolution algorithm (DE) which is a new global optimization algorithm is introduced into the displacement back analysis, and the self-developed back analysis program based on DE is used in metro station engineering. The results show that the superiority of DE and the practicability of intelligent displacement back analysis program, more importantly, it is being applied to engineering practice to provide reference and advanced prediction for the construction process.
An Electronical Cereals Weight Measure System Using Vibrating Wire Pressure Sensors
Authors: Yan Zheng Hang , Liu Yang , Li Hong Yan , Li Qiu Shan
Published: May 2011

Cereals is one fundamental factor about people's livelihood. Relatively abundant food production, to maintain a certain number, variety and quality of food reserves, directly related to national security, social stability and economic development. Maintain a certain amount, variety and quality food reserves, which is essential to ensure national food security measures. Cereals reserve and quantity monitor is a key element for food security strategy. However, most of the granaries were built many years ago, outdated facilities, technical means backward in China and many other countries. Access depends on the number of grain of experience and estimation. As different varieties of grain, place of origin, degree of packing, texture, moisture content and shelf life of different, the estimated cereals quantity data using traditional methods and real data usually have a large deviation. This restricts the development and implementation of national food security strategy. Fortunately, with the rapid development and wide application of modern information technologies, they are rapidly penetrated all aspects of grain fields and applications. Food safety system has been extended to modern technology, management and information technology and network support integrated system, and gradually developed into a warehouse as the mainstay and the main form of processing and production, related to transportation, storage, processing, circulation and consumption the whole process of information systems. Modern information technologies improve accuracy and reliability of cereals weight measure. In this paper, a cereals weight measure system combining of the new types sensors and communication technology is used in food granary. Vibrating wire pressure sensor is deployed in the bottom grain storage in advance, and then began to store grain silos. The sensor signals are sent to collection device or monitoring the background. Background calculates the weight of grain storage silos by the received data. Pressure sensor can accurately obtain the food and the weight of cereals can be scientifically obtained.
The Analysis and Comparison of the Technology Performance about Rapid Layered Switching Mobile IPv6 Protocol
Authors: Zhang Kun , Wang Hai Feng , Li Zhuang , Ma Yu Chun
Published: May 2011

With the rapid development of the internet and wireless mobile communication technology, more and more users make use of mobile terminal to access to the internet. Wireless mobile accessing technology combined with IPv6 protocol have been the present research hotspots. In this paper we analyzed the layered switching based on mobile IPv6 protocol, and compared its performance of technology. At last, corresponding conclusion is given, combining with the practical application.
Complex Modifier on Microstructure in Mg2Si/Al-Si Composite
Authors: Liu Zheng , Liu Xiao Mei , Xie Min
Published: May 2011

The effects of complex modifier (consisted of mixed rare earth oxides and CaCO3) on microstructure in Mg2Si/A1-Si composite are researched. The results show that the morphology of Mg2Si particle changes from irregular or crosses to polygonal shape, and its size obviously decreases. The modifierpresents the better modification than mixed rare earth oxides or CaCO3.
Fuzzy Controller in the Application for Anti-Surge of the Axial-Flow Compressor
Authors: Zhao Wei , Huang Wen Juan , Chen Yu Liang , Niu Jing Xia
Published: May 2011

The paper introduces the surge phenomenon of the axial-flow compressor. To ensure the blower running safely, we analyze the surge phenomenon and design a anti-surge control system by using the fuzzy control theory to control the position of the snorting valve. The result of simulation in Matlab proves that the fuzzy controller is feasible.
Measure Method on Reaction Time of Visual Attention Using a New-Style Mechatronic Measurement System
Authors: Xia Ru Ting , Fan Jian , Zhan Bai Shao
Published: May 2011

In this paper, a new measure method was suggested to examine the reaction time of visual attention of drivers using a new-style mechatronic visual attention measurement system. The system can control the peripheral environment illuminance and the present of stimulus at the start locations, and change the color of stimulus in terms of visual attention shift theory in three-dimensional (3D) space. The measurement system included the setting of observation location, stimuli location, moving speed, environment illuminance. The paper introduced the test method of visual function and the test procedures of the reaction time. The results demonstrated that this measurement system can be used to examine the reaction time and judgment response of drivers in three environmental illuminance conditions, and show that the response training for visual attention can improve the vision judgment ability of drivers.
Research on Comprehensive Control of Vibration Isolation System with Flexible Foundation
Authors: Feng De Zhen , Zhou Fang , Zhang Zai Mei , Liu Hua Guan
Published: May 2011

The paper analyzes the dynamic relation of asymmetric multi-supported vibration isolation system with flexible foundation, establishes the comprehensive model of passive control and positive control system by using the effective matrix analysis method, analyzes the transmission mechanism and characteristic of vibrational power flow in the flexible vibration isolation system. In order to meet the need of the practical engineering, the paper analyzes and calculates the effect of the machine mass on the input and the transmission power flow in detail. At last, the paper puts forward the measure to reduce vibration energy transmission.
Modeling and Simulation of Enterprise Alliance Running Status Based on System Dynamics
Authors: Zhang Xian
Published: May 2011

In this paper the key factors of the enterprise alliance running status were studied based on system dynamic theory. These factors include intrinsic restraint, achievement, core competencies and compatibility. A causality diagram and a system dynamic model which can reflect the growing process of enterprise alliance running phase were established. A program simulating the system dynamic model of the enterprise alliance running phase is also achieved, and the validation was infered by a qualitative analysis. The results show that it is a workable method to study the enterprise alliance running status with system dynamic theory．
Mediterranean Diet Mediates the Adverse Effect of Depressive Symptomatology on Short-Term Outcome in Elderly Survivors from an Acute Coronary Event
Authors: Chrysohoou Christina , Liontou Catherine , Aggelopoulos Panagiotis , Kastorini Christina-Maria , Panagiotakos Demosthenes , Aggelis Athanasios , Tsiamis Elefterios , Vavouranakis Manolis , Pitsavos Christos , Tousoulis Dimitris , Stefanadis Christodoulos
Published: May 2011

Aims. We evaluated the interaction effect between depressive symptoms and dietary habits on 30-day development of cardiovascular disease (CVD) (death or rehospitalization) in elderly, acute coronary syndrome (ACS) survivors.Methods. During 2006–2008, we recorded 277 nonfatal, consecutive ACS admissions (75 ± 6 years, 70% males, 70% had diagnosis of myocardial infarction) with complete 30-day follow-up. Assessment of recent depressive symptoms was based on the CES-D scale. Among sociodemographic, bioclinical, lifestyle characteristics, the MedDietScore that assesses the inherent characteristics of the Mediterranean diet was applied.Results. 22% of the ACS pts developed a CVD event during the first 30 days (14.8% rehospitalization and 9.4% death). Patients in the upper tertile of the CES-D scale (i.e., >18) had higher incidence of CVD events as compared with those in the lowest tertile (21% versus 8%, ). Multiple logistic regression analysis revealed that 1-unit increase in CES-D was associated with 4% higher odds (95% CI 1.008–1.076, ) of CVD events; however, when MedDietScore was entered in the model, CES-D lost its significance ().Conclusion. Short-term depressive symptoms are related to a worsen 30-day prognosis of ACS patients; however, this relationship was mediated by Mediterranean diet adherence.
Hygroscopic properties of atmospheric aerosol particles over the Eastern Mediterranean: implications for regional direct radiative forcing under clean and polluted conditions
Authors: Stock M. , Cheng Y. F. , Birmili W. , Massling A. , Wehner B. , Müller T. , Leinert S. , Kalivitis N. , Mihalopoulos N. , Wiedensohler A.
Published: May 2011

Abstract. This work examines the effect of direct radiative forcing of aerosols in the eastern Mediterranean troposphere as a function of air mass composition, particle size distribution and hygroscopicity, and relative humidity (RH). During intensive field measurements on the island of Crete, Greece, the hygroscopic properties of atmospheric particles were determined using a Hygroscopicity Tandem Differential Mobility Analyzer (H-TDMA) and a Hygroscopicity Differential Mobility Analyzer-Aerodynamic Particle Sizer (H-DMA-APS). Similar to former studies, the H-TDMA identified three hygroscopic sub-fractions of particles in the sub-μm range: a more hygroscopic group, a less hygroscopic group and a nearly hydrophobic particle group. The average hygroscopic particle growth factors at 90 % RH were a significant function of particle mobility diameter (Dp): 1.42 (± 0.05) at 30 nm compared to 1.63 (± 0.07) at 250 nm. The H-DMA-APS identified up to three hygroscopic sub-fractions at mobility diameters of 1.0 and 1.2 μm. The data recorded between 12 August and 20 October 2005 were classified into four distinct synoptic-scale air mass types distinguishing between different regions of origin (western Mediterranean vs. the Aegean Sea) as well as the degree of continental pollution (marine vs. continentally influenced). The hygroscopic properties of particles with diameter Dp≥150 nm showed the most pronounced dependency on air mass origin, with growth factors in marine air masses exceeding those in continentally influenced air masses. Particle size distributions and hygroscopic growth factors were used to calculate aerosol light scattering coefficients at ambient RH using a Mie model. A main result was the pronounced enhancement of particle scattering over the eastern Mediterranean due to hygroscopic growth, both in the marine and continentally influenced air masses. When RH reached its summer daytime values around 70–80 %, up to 50–70 % of the calculated visibility reduction was due to the hygroscopic growth of the particles by water compared to the effect of the dry particles alone. The estimated aerosol direct radiative forcings for both, marine and continentally influenced air masses were negative indicating a net cooling of the atmosphere due to the aerosol. The radiative forcing ΔFr was nevertheless governed by the total aerosol concentration most of the time: ΔFr was typically more negative for continentally influenced aerosols (ca. −4 W m−2) compared to rather clean marine aerosols (ca. −1.5 W m−2). When RH occasionally reached 90 % in marine air masses, ΔFr even reached values down to −7 W m−2. Our results emphasize, on the basis of explicit particle hygroscopicity measurements, the relevance of ambient RH for the radiative forcing of regional atmospheres.
An upper limit for water dimer absorption in the 750 nm spectral region and a revised water line list
Authors: Shillings A. J. L. , Ball S. M. , Barber M. J. , Tennyson J. , Jones R. L.
Published: May 2011

Abstract. Absorption of solar radiation by water dimer molecules in the Earth's atmosphere has the potential to act as a positive feedback effect for climate change. There seems little doubt from the results of previous laboratory and theoretical studies that significant concentrations of the water dimer should be present in the atmosphere, yet attempts to detect water dimer absorption signatures in atmospheric field studies have so far yielded inconclusive results. Here we report spectral measurements in the near-infrared around 750 nm in the expected region of the | 0〈f | 4〉b|0 〉 overtone of the water dimer's hydrogen-bonded OH stretching vibration. The results were obtained using broadband cavity ringdown spectroscopy (BBCRDS), a methodology that allows absorption measurements to be made under controlled laboratory conditions but over absorption path lengths representative of atmospheric conditions. In order to account correctly and completely for the overlapping absorption of monomer molecules in the same spectral region, we have also constructed a new list of spectral data (UCL08) for the water monomer in the 750–20 000 cm−1 (13 μm–500 nm) range. Our results show that the additional lines included in the UCL08 spectral database provide an improved representation of the measured water monomer absorption in the 750 nm region. No absorption features other than those attributable to the water monomer were detected in BBCRDS experiments performed on water vapour samples containing dimer concentrations up to an order of magnitude greater than expected in the ambient atmosphere. The absence of detectable water dimer features leads us to conclude that, in the absence of significant errors in calculated dimer oscillator strengths or monomer/dimer equilibrium constants, the widths of any water dimer absorption features present around 750 nm are of the order of 100 cm−1 HWHM, and certainly greater than the 25–30 cm−1 HWHM reported in the literature for lower energy water dimer transitions up to 8000 cm−1.
Variability of aerosol optical properties in the Western Mediterranean Basin
Authors: Pandolfi M. , Cusack M. , Alastuey A. , Querol X.
Published: May 2011

Abstract. Aerosol light scattering, black carbon (BC) and particulate matter (PM) concentrations were measured at Montseny, a regional background site in the Western Mediterranean Basin (WMB) which is part of the European Supersite for Atmospheric Aerosol Research (EUSAAR). Off line analyses of 24 h PM filters collected with Hi-Vol instruments were performed for the determination of the main chemical components of PM. Measurements of BC were used to calculate the light absorption properties of atmospheric particles. Single Scattering Albedo (SSA) at 635 nm was estimated starting from aerosol scattering and absorption measurements, while Ångström exponents were calculated by means of the three wavelengths (450 nm, 525 nm, 635 nm) aerosol light scattering measurements from Nephelometer. Mean scattering and hemispheric backscattering coefficients (@ 635 nm) were 26.8 ± 23.3 Mm−1 and 4.3 ± 2.7 Mm−1, respectively and the mean aerosol absorption coefficient was 2.8 ± 2.2 Mm−1. Mean values of Single Scattering Albedo (SSA) and Ångström exponent (calculated from 450 nm to 635 nm) at MSY were 0.90 ± 0.05 and 1.2 ± 0.6, respectively. A clear relationship was observed between the PM1/PM10 and PM2.5/PM10 ratios as a function of the calculated Ångström exponents. Mass scattering cross sections for fine mass and sulfate at 635 nm were calculated in 2.8 ± 0.5 m2 g−1 and 11.8 ± 2.2 m2 g−1 respectively, while the mean aerosol absorption cross section was estimated around 10.4 ± 2.0 m2 g−1. The variability in aerosol optical properties in the WMB were largely explained by the origin and ageing of air masses over the measurement site. The sea breeze played an important role in transporting pollutants from the developed WMB coastlines towards inland rural areas, changing the optical properties of aerosols. Aerosol scattering and backscattering coefficients increased by around 40 % in the afternoon when the sea breeze was fully developed while the absorption coefficient increased by more than 100 % as a consequence of the increase in BC concentration at MSY observed under sea breeze circulation. The analysis of the Ångström (Å) exponent as a function of the origin the air masses revealed that polluted winter anticyclonic conditions and summer recirculation scenarios typical of the WMB led to an increase of fine particles in the atmosphere (Å = 1.4 ± 0.1) while the aerosol optical properties under Atlantic Advection episodes and Saharan dust outbreaks were clearly dominated by coarser particles (Å = 0.7 ± 0.3).