bluuebunny/crossref_metadata_2025 huggingface dataset:
Internal Flow Field Analysis of Air-Suction Roller-Type Precision Metering Device
Authors: Ren Chuang , Lai Qing Hui , Zhang Zhao Guo , Gao Xiao Jun , Wang Zeng Yao , Li Ying Ying
Published: August 2014

In order to analyze the influence of structure parameter of air-suction roller-type precision metering device on the flow velocity and pressure, the flow field was calculation and simulation. Take the compressibility and the viscosity of the real gas into account, the N-S equations, RNG k-ε turbulence model and wall function were applied to measure the flow rate and pressure of the outlet under the conditions of changing the area of the suction holes and the diameter of shaft. The results revealed that compared with the shaft holes area, the diameter of center axis have a marked influence on the flow velocity and pressure of outlet. When the area of suction holes is constant, with the increase of shaft diameter, the outlet velocity increased and pressure decreased; when the diameter of axle is constant, with the shaft holes area increase, the outlet velocity increased and pressure decreased.
The UG Parametric Design of Vertical Horizontal Circular Vibration Drier Chassis
Authors: Li Xue Bing
Published: August 2014

Vibration chassis is the point parts of vertical horizontal circular vibration drier, the paper used UG software to conduct parametric design. The paper established parts template, parts library and UG style menu of the vibration chassis. The paper also used UG further development module and the corresponding C++ program in Visual C++ development environment to control and transmit the parameters. The paper established parametric design based on the combination of the two factors. When the users input parameters, they could get more complete design project after a short time of operation in this designing software. The software could reduce or even avoid a large number of manual tedious and boring modification processes. It also could reduce calculation and workload for the designer and has higher practical application value.
Instructional Design Integrated with Quality Function Deployment (QFD) and TRIZ40
Authors: Louhapensang Chaturong , Seviset Somchai
Published: August 2014

This paper concentrates on the development of instructional design integrated with Quality Function Deployment (QFD) and TRIZ40 principles model. This paper draws from the research study which aimed to investigate the development of instructional design integrated with QFD and TRIZ40 principles model for the Design Education Program in the Faculty of Industrial Education at King Mongkut’s institute of Technology Ladkrabang, Bangkok, Thailand. The research methodology was a mix methods. The sample groups were composed of 5 lecturers and 100 Undergraduate students of the Design Education Program. The research methods were questionnaires and focus group technique. The statistics used were frequency, percentage, arithmetic means, and standard deviation. The research found that there are 3 steps of instructional design development integrated with QFD and TRIZ40 principles model. The first step was a learning and acceptation process. The second was to develop the instructional design, which was integrated with QFD and TRIZ40 principles model for the Design Education courses. The last step was evaluation on students’ learning and satisfaction. Based on evaluation of the instructional design experts, the instructional design, which was integrated with QFD and TRIZ40 principles model was highly appropriate for undergraduate students in the Design Education Program. This study reviewed that lecturers and students’ satisfaction with the instructional design integrated with QFD and TRIZ40 were also high because it was easy to utilize. Moreover, it was very effective to evaluate their progress throughout their learning process. Undergraduate students learn with Model of Instructional Design integrated with QFD and TRIZ40 principles for Design Education in Undergraduate Study Level. Have higher achievement scores than Learning in normal/regular classroom with a statistical significance level of 0.05.
Observations of Out-of-Plane Rocking in the Oratory of San Giuseppe Dei Minimi during the 2009 L’Aquila Earthquake
Authors: Sorrentino Luigi , Alshawa Omar , Liberatore Domenico
Published: August 2014

Contrary to other structural types, unreinforced masonry buildings display local collapses during strong earthquakes, especially in the case of large-hall constructions. This is also what has happened in the Oratory of San Giuseppe dei Minimi, located in the historical centre of L'Aquila (central Italy) and affected by the 2009 earthquake. The church suffered the out-of-plane response of its façade and parapet belfry. These mechanisms are studied recurring to non-linear dynamic models, calibrated with experimental data. The outcome of such analyses is in reasonable agreement with observed damages. Hence, it is possible to recommend this approach for the seismic assessment of similar buildings.
Numerical Analysis and Optimization of Flat Ends Parameters in Pressure Vessels with Rectangular Shape
Authors: Szybiński Bogdan , Romanowicz Paweł
Published: August 2014

Cylindrical pressure vessels with circular cross section are commonly used in the construction of various pressure apparatus; however in certain cases other cross sections are applied. The vessels with rectangular and elliptical perpendicular cross section are of the main interest and certain formulas for their calculations are stated in the respective codes [1, 2]. In these appliances flat ends of various shapes are usually used as the vessels caps. Similarly, as for the cylindrical boilers, flat end plates with stress relieve grooves are recommended. Like in the flat ends for cylindrical pipes certain variation of the groove parameters is possible but again no clear suggestion is given how to choose the optimal groove parameters providing the minimum stress concentration [3]. In this paper the numerical analysis and optimization of the admitted by code [1] groove parameters is presented for the pipe with the rectangular cross section subjected to the internal pressure.
The Calculation of the Dynamic Problem for the Thin Shell by Method of Convolution-Type Point Collocation
Authors: Li Yong Li , Zhao Zhi Gang , Yang Hua
Published: August 2014

Dynamic analysis of elastic body for plate and shell is important and difficult to solute. The convolution-type weighted residuals method is a new method, which is applied to solve dynamic problems. And the method of convolution-type point collocation is applied to solve dynamic problems of thin shell. An effective approach to structural dynamic analysis of thin shell is provided.
Design of a PLC-Based Automatic Separate Channel Filter Rod Sampling Detection System
Authors: Ying Wei , Li Yu Liang , Zhang Guang , Fang Ting , Zhao Liang
Published: August 2014

DF10 filter rod forming machine produced by Italy GD Automatic Machinery Ltd is the world's fastest filter rod maker adopting the design of dual-channel. To achieve automatic sampling detection on line, a PLC-based automatic separate channel filter rod sampling detection system has been designed. Mainly composed of a sampling and launching device, matching tube, receiving device, a test instruments, PLC control unit and data terminal, the system first samples the filter rods from the two channels, then launches them into the test instrument to measure their physical parameters, and after wards send the real-time feedback of testing data to the data terminal. The application results show that the system has the advantages of convenient operation, high stability, safety and reliability. With an effective batch’s completion rate above 98%, it greatly reduces the labor intensity of operators and QC personnel, and significantly improves the quality control capacity of filter rod production.
Modeling of Surface Waviness in Abrasive Waterjet Offset-Mode Turning
Authors: Zohourkari Iman , Zohoor Mehdi , Annoni Massimiliano
Published: August 2014

In this paper, surface waviness produced by turning aluminum parts with abrasive waterjet has been studied regarding changes in some process parameters. Effect of five major parameters such as water pressure, cutting head traverse speed, abrasive mass flow rate, workpiece rotational speed and depth of cut have been investigated using analysis of variances. Second order regression model presented forwaviness.The validity of the model wasconfirmed bycomparing with experimental data. It found thatabrasive mass flow rate, cutting head traverse speed and DOC are the most influencing parameters while water pressure and workpiece rotational speed show lesser effectiveness.
Improvement in Queuing Network Model to Reduce Waiting Time at Berthing Area of Port Container Terminal via Discrete Event Simulation
Authors: Shahpanah A. , Shariatmadari S. , Chegeni Ali , Gholamkhasi A. , Shahpanah M.
Published: August 2014

Queuing problems present a gap in the availability of knowledge at port container terminals. This study is focused on various types of services for port container terminal queuing system. The purpose of this paper is to introduce a methodology to decrease waiting time without any reduction in productivity. A new approach for servicing at the queue is proposed, and with this idea waiting time will be reduced without any change in productivity or additional cost. To execute this approach in a port container terminal, berthing areas of the port are simulated with ARENA 13.5, and this new approach is implemented in the model. The result of this change are compared with results of a port container terminal as case study. With implementing this method the waiting time is reduced dramatically and productivity increased slowly.
Diver Communication System Based on Underwater Optical Communication
Authors: Chen Shuo , Song Jun Lei , Yuan Zi Min , Liu Yang , Guo Pei Pei
Published: August 2014

The underwater diver visible light communication system integrating information collection, transmission and processing achieves the optical communication device established for the diver’s underwater wireless transmission and underwater sensor network. The front-end signal acquisition module capable of carrying out voice and image acquisition utilizes a MEMS digital microphone and a high performance CMOS camera to change optical signals in to digital ones. The signal source applies wavelet conversion and the channel coding and decoding apply Turbo algorithms, channel modulation and demodulation adopt PPM modulation, so compression, coding and modulation are mounted on TI's high-performance DSP TMS320DM642 platform to ensure the stability and reliability of data transmission. Back-end data acquisition module utilizes a photomultiplier tube and its peripheral circuits for receiving and converting optical signals. Display and storage modules are TFT and SD cards to achieve data reception and sound and light reduction and storage functions.
External Effects Evaluation Analysis of Decentralized Wastewater Reuse Projects
Authors: Liu Xiao Jun , Liang Juan
Published: August 2014

The external effect of decentralized wastewater reuse project will be divided into external factors and the impact of external factors on the reuse of sewage project itself, apply this two integrated impacts of evaluation analysis method Benefit - Cost - Opportunity - Threat (BCOT) to analyze comprehensively the wastewater project external effect and use the Xi`an Greenland Century City project as an example. The study on the BCOT evaluation analysis gives the external effects of researching decentralized wastewater resource a new idea.
Application of Zeolite as a Partial Replacement of Cement in Concrete Production
Authors: Vejmelková Eva , Koňáková Dana , Čáchová Monika , Keppert Martin , Hubáček Adam , Černý Robert
Published: August 2014

Natural zeolite rocks are known to be able to act as Supplementary Cementitious Materials (SCM) in Portland cement based concrete. Generally SCMs are reacting with portlandite and providing binding hydration products just as Portland cement does. In this way an SCM can substitute certain amount of Portland cement in concrete and thus reduce the related energy consumption and CO2 generation. Due to a large variability of SCMs composition and properties there is not any general rule for an optimum Portland cement substitution level. In this paper, the influence of natural zeolite rock on selected mechanical, hygric and thermal properties of concrete is studied. Experimental results show that the analyzed zeolite is acting as a pozzolan but for higher amounts its application leads to an increase in concrete porosity which affects its properties in a significant way.
Study on the Early Hydration of Cement Paste Containing Sodium Chloride
Authors: Embong Rahimah , Kusbiantoro Andri
Published: August 2014

This paper studies the effect of sodium chloride as the additive component in cement paste. Sodium chloride was included at 0.5%, 1%, 1.5%, and 2% by weight of cement content. Analysis on the performance of this reagent was conducted via setting time, compressive strength, and porosity test. Based on the setting time analysis, the inclusion of sodium chloride can extend the initial setting time of cement paste up to 24.91% longer than control specimen. Obstruction on the formation of calcium silicate hydrate gel by sodium and chloride ion was one of the possible causes to this phenomenon. Acceleration on the compressive strength development by sodium chloride was also detected. It appears that sodium chloride was able to de-flocculate the coagulated cement particles and reduced the viscosities of cement slurries; hence resulted in faster early hydration process.
Theoretical Study of Wetting Transformation on Regularly Hexagonal Array of Copper Surface
Authors: Shang Guang Rui , Wang Qing Cheng , Yang Xiao Dong
Published: August 2014

In this thesis we provide the electrodeposition technology by means of monolayer templates for fabricating regularly hexagonal array of copper surface, predict the wetting transformation in theory. We report the result that original hydrophilic copper surface may turn to be hydrophobic surface by this kind of structurization. The apparent contact angle would convert from less thanto more than.
The Features of Structure Formation in Mechanically Activated Powder Mixture 3Ti+Al in the Thermal Explosion Mode
Authors: Filimonov V.Y. , Sitnikov Alexander Andreevich , Yakovlev V.I. , Loginova Marina V. , Afanasyev A.V. , Negodyaev Alexey Z.
Published: August 2014

The experimental investigation of structure formation processes in preliminary mechanically activated powder mixture 3Ti + Al was carried out. The synthesis was realized in the thermal explosion mode with the use of high-frequency induction heating. The characteristic features of structure and phase formation in this system by quenching of the mixture at different annealing times were installed. It was shown, that the processes of structure-phase formation occur in the following sequence: chemical reaction - structural relaxation - thermal relaxation - thermal equilibrium. The time-temperature intervals of Ti3Al strictly single-phase compound existence with various concentrationsof non-equilibrium defects of the structure were established.
Design and Realization on the Financial Early-Warning Analysis System of Colleges and Universities Based on Data Mining Technology
Authors: Qi De Jiang , Hu Hai Yan
Published: August 2014

In this thesis, in order to solve the student arrearage problems in colleges and universities, risk weight factor is introduced to improve ID3 algorithm through the research on data mining technology and the combination with financial management system of colleges and universities so that ID3 decision-making tree algorithm can classify based on the risk weights of all the factors of the financial data; the early warning system scheme on the student arrearage problems in colleges and universities is designed so as to predict the high-risk defaulting students dynamically and accurately and lay scientific foundations for avoiding financial risk in colleges and universities.
Based on the User-Centered Design and Development of Fiber Sensor Monitoring System
Authors: Li Juan Ni , Wang Wei , Zhen Yan Kun , Liu Xue Qin
Published: August 2014

A basic problem in the design of monitoring system is how to improve the usability, this paper describes a methods based on the User-Centered Design and analyses user from task domains and cognitive psychology aspects. After deciding the interaction system’s task requirement and usability requirement, we develop the Fiber Bragg Grating Monitoring System in JAVA platform with JAXB and JDBC technology.
Research on Decoding Scheme of S6a Interface Diameter Protocol in LTE Network Monitoring System
Authors: Han Ying Ying , Xi Bing , Zhang Zhi Zhong
Published: August 2014

In view of the existing decoding scheme of poor portability and low efficiency, the article analyzes the basic concepts, functions and message structure of the Diameter protocol in LTE (Long Term Evolution) network, then puts forward innovative decoding solutions by using dictionary method to resolve Diameter protocol. After testing by the current network data, the scheme has been verified to be correct and feasible, and effectively solves the decoding issue of Diameter protocol different message types in the LTE network.
Developing Situation and Tendency of Tire Industries in Developed Countries
Authors: Wang Zhao Jun , Liu Shuai
Published: August 2014

The industrial economy in developed countries developed rapidly,so as to the tire industries,which have made the huge progress.The tire industries in developed countries are better than developing countries,both of the industrial scale and strength. In this paper, took the developed countries as the main studying objects, based on describing the developing situation of tire industry,analyzed its tendency that the declining of industrial concentration , investing in developing countries, product competition strategy converting from traditional tires to green tires, and increasing of recycling rate of waste tires.
Numerical Simulation of Water Impact of 2D Wedge with Different Density
Authors: Li Cheng Jun , Ren Hui Long , Li Chen Feng
Published: August 2014

It remains unresolved to study the relation between the density of wedge and its impact. Fluent is applied to simulate its mechanism with 6DOF model. After the comparison of numerical result and the theoretical, it matches good and then the transient free surface scene is observed. Thus Fluent is able to solve this kind of non-linear problem. And the effect of density of wedge on the slamming character is also studied.
Experimental Study on the Lateral Compression and Energy Absorption Characteristic of Steel Tube Filled with Polyurethane Foam
Authors: Zhou Zhao Peng , Qin You Quan , Liu Fei , Wang Yan Mi
Published: August 2014

In order to enhance the lateral compression energy absorption capability of round steel tube without obviously increasing the mass of round steel tube, this paper has developed the polyurethane foam filled round steel tube and through experimental comparison, studied such parameters as the laterally-compressed platform loading, total absorbed energy and energy absorbed per unit mass for the filled tubes and empty tubes of three kinds of pipe diameter. The results show that the round steel tube filled with polyurethane foam can change the deformation mode of round steel tube and increase the energy absorption capability of steel tube substantially with very little increase of mass; the energy absorption efficiency is obviously higher than the one of empty steel tube.
Creep Analysis of Combined Bolted Flange Joints under High Temperature
Authors: Wang He Hui , Zhang Yan
Published: August 2014

The tightness of bolted flange joints will weaken due to the loss of bolt load as a result of creep under high temperature. There exists no mature calculation procedure that can accounts for creep. Based on the finite element simulation of a combined flanged joint under four various conditions, the strength integrity and sealing performance of it are evaluated according to the code JB4732-2005. The results show that the integrity and tightness of the combined flanged joint under pre-loading condition, pressure condition and operating condition (except local film stress) meet requirements. However, more than 50% of the bolt load relaxation is found due to creep, part of the gasket residual stress is lower than the required minimum sealing pressure. It can lead to leakage. Bigger bolt pre-tightening force, materials with good creep relaxation resistance and hot-tighting method are recommended to reduce the influence of creep.
Experimental Study on Cross Section Lateral Compression Energy Absorption Characteristics of Three Types of Steel Tubes
Authors: Zhou Zhao Peng , Fang Qin , Li Fei , Zhu Xin Hua , Wang Yan Mi
Published: August 2014

In order to understand the energy absorption characteristics of various types of steel tubes and provide certain basis for model selection in the engineering application, this paper adopts the experimental study to conduct the comparative study on lateral quasi-static compression energy absorption characteristics of three types of steel tubes, i.e. round steel tube, square steel tube and hexagonal steel tube. Through analysis of the test phenomenon, the total energy absorbed by equal deformation and the energy absorbed per unit mass, the result shows that the steel tube with hexagonal cross section is provided with such advantages as steady absorption, stable deformation mode and high energy absorption ratio, and is more suitable for application in engineering than the round steel tube and the square steel tube.
Theoretical and Numerical Analysis on the Static-Loaded Contact Pressure of Mechanical Elastic Wheel
Authors: Li Xiao Long , Zhao You Qun , Zhang Ming Jie
Published: August 2014

This paper describes the theoretical and numerical methods to calculate the contact pressure of Mechanical Elastic Wheel (MEW). The structure of MEW was introduced firstly, and then the contact pressure of MEW was calculated with the simplified model of a single layer composite ring according to Elasticity. Considering the structure and force symmetry, 1/2 finite element model of MEW was built. Mooney-Rivilin hyperelastic constitutive model was applied to simulate material nonlinearity, and frictionless contact type was applied to simulate nonlinear contact characteristics. With the Augmented Lagrangian solving method, the contact pressure analysis result of MEW was obtained. The theoretical and simulation values of MEW’s contact pressure are approximate with the deviation of 1.08%, and it indicates the validity of the simulation.
Extraction of Aluminum from High Iron Bauxite by Carbothermal Reduction-Ammonium Sulfate Roasting
Authors: Jin Jing Yun , Li Zai Yuan , Wu Yan
Published: August 2014

A new preparation of alumina from high iron bauxite, which has not been being made reasonably use of yet, has been studied. Iron in high iron bauxite was removed by carbothermal reduction and aluminum-rich slag could be obtained. Then aluminum was extracted from aluminum-rich slag by ammonium sulfate roasting. After leaching, Al2(SO4)3 was obtained, which can be used for preparation of alumina. The effects of roasting temperature, roasting time, ammonium sulfate/aluminum-rich slag mass ratio were investigated. Optimum roasting conditions from aluminum-rich slag by ammonium sulfate were found as roasting temperature:400°C;roasting time:120min;ammonium sulfate/aluminum-rich slag mass ratio:6. Approximately 98% of aluminum was effectively extracted.
Load Analysis and Structure Design of Small-Scale Maglev Wind Turbine
Authors: Liu Ming Xue , Hu Ye Fa , Dong Ru Hao , Peng Shi Min , Wu Hua Chun
Published: August 2014

To effectively reduce friction torque and start-up wind speed, magnetic bearing was applied to the small-scale wind turbine. Load analysis is the primary task of the design for magnetic bearing in wind turbine. Based on a typical blade model, the aerodynamic performance of the impeller was simulated using Computational Fluid Dynamics (CFD) method. The characteristics and differences of the impeller’s aerodynamic performance under different wind speeds were analyzed and the aerodynamic loads were calculated as well. Moreover, the bearing capacity of magnetic bearing was calculated according to the forces on the spindle. A kind of permanent magnetic bearing (PMB) was designed for the radial supporting of the spindle in wind turbine. A prototype of the small-scale maglev wind turbine (SMWT) was presented, which provides some basis for the application of magnetic bearings in wind turbines.
Reliability Analysis and Optimization of Constant Current Remote Power Feeding System of Seafloor Observatory Network
Authors: Fan Cheng , Zhou Xue Jun , Wang Xi Chen
Published: August 2014

Study on the deterioration of the constant current remote feeding system throughout the life of the structure is always one of the most important issues in seafloor observatory network reliability engineering. Relationship between current-to-current convertor subsystem and amount of loads in branch line is described by introducing failure rate factor. Multistate reliability model of remote power feeding system has been set up and solved by genetic algorithms. Simulation results show that as the load configuration in trunk line and branch line changing, there exists best combination maximizes the system reliability, besides, appropriate increasing amount of loads in branch line can optimize the preventive strategy.
A Study on Nonlinear Decoupling Controller for UPFC
Authors: Chen Zhi Bin , Ma Yan , Su Bo Wen
Published: August 2014

In the d-q coordinate system, UPFC mathematical model reveals a nonlinear system with features of a multi-variable, strong coupling, and more interference. In view of these system characteristics, the paper presents a nonlinear overlapping decoupled strategy with better stability and dynamic performance for UPFC control. The control strategy is analyzed and tested with the MATLAB simulative experiments. Simulation results show that the proposed control strategy can quickly and accurately respond to the needs of the power system, and realize real power and reactive power decoupling control effectively.
Keywords: Dynamic Modeling, Nonlinear, Decoupling Controller, UPFC, MATLAB
Research on the Electronic System Design of the Automobile Based on PLC and MPC
Authors: Chen Yun , Tao Qiang , Wang Heng
Published: August 2014

By comparing various field bus technology, considering automobile electrical control system its own situation, we establish the automobile electrical control system method based on PLC mixed network, discuss the system's design goals, function and main structure; Introduce PLC bus and LIN1.2 bus basic theory and protocol. Design the hardware circuit based on PLC bus and LIN1.2 bus protocol strictly including PLC node circuit design, LIN node circuit design and PLC/LIN gateway circuit design. The chips used in the circuit design and their performances are also detailed introduced. In the end, the system software is designed and the main flow chart is also given in this study.
The Voice Activity Detection Algorithm Based on Spectral Entropy and High-Order Statistics
Authors: Li Qiang , Xie Hong En , Zheng Qiu Ju
Published: August 2014

The voice activity detection is one of the key technologies of variable rate speech coding. The development of speech coding technology requires higher performance of the detection. Based on the analysis of spectral entropy and high-order statistics of the basic definition and property of the foundation, this article proposes a voice activity detection algorithm which combines spectral entropy with high-order statistics. The algorithm can effectively detect the speech and non-speech segments, and can get reasonable results in a complex background noise environment.
Application and Research of Weighted Wireless Network Node Load Evaluation Method Based on Network Contribution Degree
Authors: Yu Gui Bin , Li Shao Chun
Published: August 2014

In data gathering application of Wireless Sensor Networks, the unbalanced load causes premature death of sensor nodes and shortens the network lifetime.The Dynamic Load-Balancing algorithm for Data Gathering Application is proposed.Motivated by the idea of pressure transfers and pressure balancing, the pressure transfers model and load-balancing model are proposed, by which the network can reach the maximum degree load-balancing step by step. Experimental results validate the effectiveness of this approach.
Two-Parameter Parabolic Mohr Strength Criterion Applied to Analyze the Results of the Brazilian Test
Authors: Fan Qi , Gu Shuan Cheng , Wang Bo Nan , Huang Rong Bin
Published: August 2014

Geotechnical engineering in tension damage is one of the major failure modes. For a long time, Brazil test has practical significance and wide application value that has been used to determine the tensile strength of rock. When the specimen center destroyed tensile stress play a major role that is the theoretical basis of Brazil test. This is uniaxial tensile stress state, but the reality is complex stress state. Theoretical analysis shows that the Brazilian test does not truly reflect the tensile strength of rock, its test results to error. In this paper, two-parameter parabolic Mohr strength criterion for this error analysis, and propose amendments to the formula.
Statistical Analysis for Platform Height Ratio of Horizontal Components in Bedrock Seismic Oscillation Velocity Response Spectrum
Authors: Kong Yu Yang , Lian Chao , Song Chen
Published: August 2014

Based on the strong ground motion records of the bedrock, the overall feature of ratio (H1/H2) of the platform height of two horizontal components in velocity response spectrum was analyzed. The results show that: (1) The platform height values of two horizontal components are different from each other; (2) H1/H2 decreases with the increasing of earthquake magnitude, decreases with the increasing of epicenter distance, and tends to be 1 in far field.
A Theory of Hierarchy-Gray for Purchase Decision Support Systems
Authors: Wang Gui Qiang , Fan Xiao Wei , Wang Xiao Ning , Chen He Bing , Chen Wei , Xiong Xiao Jiang
Published: August 2014

The selection of suppliers is very important in the purchase of decision support systems. In this paper, firstly the complicated factors of supplier selection which existed in the course of purchase inviting bid are analyzed systemically, Then an comprehensive evaluation index system for picking up the ideal bidders is put forward, Based on the hierarchy-gray theory, a multi-attribute decision mathematics model of purchase inviting bid is constructed, Finally feasibility and effectiveness of the model is testified by a example.
Affect of Interactions between FM/AFM in La5/8Ca3/8Mn1-xCoxO3 System on the Magnetic Properties
Authors: Cheng Su Jun , Yao Kai
Published: August 2014

This paper studies changes in the relationship between magnetic properties of La5/8Ca3/8Mn1-xCoxO3 (x≤0.3) system and temperature and magnetic field. By the lattice structure of the sample when x=0.3 varies with temperature analysis that, related changes of lattice structure also occurred in the magnetic transition region. The difference of lattice parameter is increased, orthogonal O' phase substitute orthogonal O. We speculate that spin-state transitions may be appear in this interval. At low temperature of x=0.3 sample, the behavior of AFM sample should coexist with the CG, eg itinerant electron reduce, resistance increase and drastically reduce conductivity.
Research on the Properties of Collapsible Loess Reinforced by Cement
Authors: Su Xiao Ping
Published: August 2014

The collapsibility of loess ground can directly affect the stability of the subgrade. Therefore, How to adopt practical technical measures to reduce or eliminate its collapse deformation is an important content in foundation design in collapsible loess zone. Taking collapsible loess of the Liaoning Fuxin to Chaoyang highway as an example, the dispensing formula tests of cement were done. Mix cement in varying proportions with loess of different water content, then unconfined compression strengths of samples at four different ages were tested, and the relationship between improved soil strength and content of quick lime as well as ages was analyzed. The results indicate: 1) When the ages are certain, the strength of loess increases along with the mixture ratio increases, when the cement mixture ratio between 4%-14%, the scope of increases is quite obvious; 2) When the mixture ratio of specimens is certain, the intensity of test specimens increases along with the stadium increases, the intensity grows obviously in 28 days, and the growth rate is small in 28 to 90 days, the intensity will tend to be steady in the stadium of 90 days.
Early Presumption on the 28d Strength of Cement-Clay Composite Powder Mixed Mortar
Authors: Xie Jun , Yan Jie , Fan Xu Ying , Zhang Jing Yu , Xu Yong Feng
Published: August 2014

Based on the mixing ratio design of the cement-clay composite powder mixed mortar ,in this article,the 28d strength was early presumed by the 7d strength;by the method of mathematical statistics, different regression equations were established and the results were compared,which indicated that exponential equation had a better stability;the early presumption of 28 day strength of cement-clay composite powder Mixed Mortar provided a scientific basis for engineering construction.
Improvement of Crystal and Optical Properties of ZnO Film Grown on Hydrogen-Implanted Compliant Si Substrate
Authors: Yu Biao , Fan Hai Bo , Liu Zhao Yang , Zhang Zhe Peng , Yao He Bao
Published: August 2014

Zinc oxide (ZnO) films are deposited on hydrogen (H+)-implanted Si and bare Si substrates respectively by Metal-organic Chemical Vapor Deposition (MOCVD). The properties of the films are investigated with Scanning electron microscopy (SEM), X-ray diffraction (XRD), Atom Force Microscopy (AFM), Raman spectra and Photoluminescence (PL) detections, from which we find that compared with bare Si substrate, H+-implanted Si can act as a compliant substrate (CS) and effectively improve the crystal quality, decrease the inner stress arisen from the misfit between substrate and epitaxial layer, perfect the film surface smooth degree and optimize the optical quality. At the end, the CS working mechanism is discussed.
Preparation and Study on the Electric Properties of PI-Al2O3 /PI-TiO2/PI-Al2O3 Three Layers Nanocomposite Films
Authors: Lin Jia Qi , Liu Ying , Yang Wen Long , Lin Hui
Published: August 2014

Polyimide-Al2O3 nanocomposite films were prepared via simple mechanical blending of Polyimide and surface modified Al2O3, and Polyimide-TiO2 nanocomposite films were prepared by the polymerization process of adding tetrabutyl orthotitanate (TBOT) and the coupling agent isocyanatopropyltriethoxysilane (ICTOS) in polyimide. The three layers nanocomposite films were characterized by scanning electron microscope (SEM). The homogeneous dispersion is observed by the SEM when the concentration of Al2O3 is low. The electrical properties of the nanocomposite films were investigated as a function of the concentration of the Al2O3 nanoparticles. The results show that the dielectric constant and the dielectric loss (tan δ) of these films increased with the increase of the content of silica particles.
Structure Evolution of Fe-Mn Based Alloys under a Near-Rapid Solidification Process
Authors: Lu Wei , Shen Zheng Yan , Yang Yang , Zhang Yun Hu , Song Chang Jiang , Zhai Qi Jie
Published: August 2014

A series of near-rapid solidification experiments were performed to investigate the structure evolution in Fe-(6, 11, 13, 17, 21) wt.% Mn and Fe-11wt.%Mn-(0.1, 0.5,1.4) wt.% C strips. The α’-martensite of body-centered cubic structures were observed in all Fe-Mn alloy strips. The ε-martensite phase appeared when the manganese content was up to 13wt.% and its amount gradually increased with the increasing of manganese content. The austenitic phase began to appear in Fe-21wt.%Mnstrip. As for the solidified structure analysis, the Fe-13wt.%Mn strip had a quite large equiaxed grain zone, while other Fe-Mn strips mainly consisted of columnar grains grew from the surfaces. The addition of 0.1wt.%C was helpful for the formation of ε-martensite in Fe-11wt.%Mn strip, but the addition of 0.5 and 1.4wt.%C promoted the transformation of ε-martensite to austenite phase. And addition of 0.5wt.% carbon could increase the area ratio of equiaxed grains formation.
A Novel Method to Order Nanowire Based on Macrofludic System
Authors: Xu Ting Zhong , Rahman Hebibul , Zhao Li Bo , Zhao Yu Long , Jiang Zhuang De
Published: August 2014

The rheology of nanowires (NWs) and nanotubes (NTs) in shear flow has been analyzed by molecular dynamics (MD) simulation and macrofludic simulation. A method based on macrofludic system for aligning NWs and NTs is demonstrated. In this method, vortex is generated near the surface of a plane by using a mushroom like turnplate. Then a uniform velocity gradient was generated on the surface of the plane. Through controlling the rotational speed of the turnplate, the rheology of NWs and NTs in suspension can be easily controlled. So it provides a more effective and economical method for the alignment of NWs and NTs, as well as forming the anisotropy NWs and NTs bulk material.
The Parameters Control of Recirculation Treatment for Leachate
Authors: Jiang Bao Jun , Tian Zhu Jun , Jiang Jin Ming
Published: August 2014

The three parameters, hydraulic loading rate, organic loading rate and recirculation times have important influence on the efficiency of recirculation treatment, the recirculation experiment research removal of COD under different hydraulic loading rate, organic loading rate and recirculation times by the experimental devices built in landfill in a civil city. The result indicated that the hydraulic loading rate is the major influence parameter for leachate recirculation. When hydraulic loading rate was 30ml/L·d~200ml/L·d, COD removal efficiency was 70%~94%; However, organic loading rate has comparative minor influence on recirculation treatment; the apt recirculation times are 3 or 4 in a day; C/N of recirculation leachate have important influence on NH3-N removal rate, but the effect of hydraulic loading rate and recirculation times on NH3-N removal rate aren’t obvious.
Preparation of an Environmental Friendly Slow Release Nitrogen Fertilizer
Authors: Li Jing , Hu Yu Sen , Pu Lu Mei , Guo Guang Sheng , Niu Hong Yan
Published: August 2014

An environmental friendly slow-release urea fertilizer with double films (SUFDF) was prepared by using dialdehyde starch urea resin (DASU) as inner coating and polylactic acid (PLA) as outer materials. The structural, chemical characteristics and morphology of the SUFDF were characterized by FTIR, element analysis and SEM. Its efficiency in slowing the nitrogen release was examined via soil leaching and pot experiments. The experimental results indicated that the introduction of hydrophobic PLA and DASU reduced the swell ability of the fertilizer, which made it can provide nitrogen persistently at the early farming. After the urea dissolved, the DASU in the fertilizer would continue to release nitrogen due to its good slow-release property. So this fertilizer would have potential applications in modern agriculture and horticulture.
Pretreatment Techniques for Arsenic Speciation Analysis in Biosamples
Authors: Guo Jin Ling , Yu Xiao Ping , Guo Ya Fei , Deng Tian Long
Published: August 2014

Sample pretreatment techniques for arsenic speciation analysis in biosamples are of significant importance in detection procedures. In this paper, several typical pretreatment techniques such as solvent extraction (SE), enzymatic hydrolysis (EH), pressurized liquid extraction (PLE), solid phase microextraction (SPME) and liquid phase microextraction (LPME) were summarized on the basis of 20 references. The new trend in the future was also carried out.
Magnetism and Half-Metallicity in (100) Surface of Inverse Heusler Mn2CoSb
Authors: Chen Tao , Chen Ying , Zhou Yin , Chen Hong
Published: August 2014

Using the first-principles calculations within density functional theory (DFT), we investigated the electronic and magnetic properties of (100) surface of inverse Heusler alloy Mn2CoSb with five different terminations. Our work reveals that the surface Mn atom moves to vacuum while surface Co atom moves to slab. Moreover, duo to the reason that the surface atom lost half of the nearest atoms with respect to the bulk phase, resulting in the decrease of hybridization, the atom-resolved spin magnetic moments of surface atoms are enhanced. Further investigation on DOS and PDOS showed that half-metallicity was preserved only in SbSb-termination while was destroyed in MnCo-, MnSb-, MnMn-, and CoCo-termination due to the appearance of surface states.
Application of Modified Carbon Molecular Sieves for Air Separation Based on Adsorption Kinetics
Authors: Sun Hong Li , Wang Hong Mei , Luo Shi Zhong
Published: August 2014

Several kinds of modified carbon molecular sieves (CMSs) were applied for air dynamic separation by pressure swing adsorption (PSA) at ambient temperature. The textural properties were characterized by N2 adsorption/desorption isotherms at 77 K. Linear driving force (LDF) model was used to fit the experimental data for the mixed gas. Results had shown that the modified CMSs with Cu2+ had the highest separation factor for air separation comparing to other samples.
Solvent-Free Oxidation of Benzyl Alcohol by 30% H2O2 over LDH Hosted Chromium Complex
Authors: Wang Xiao Li , Wu Gong De , Zhai Zhi Li , Dai Yu Wei
Published: August 2014

A Mg–Al layered-double hydroxide (LDH) intercalated by sulphonato-salhen-chromium (III) complex was prepared and then used to the selective oxidation of benzyl alcohol by 30% H2O2. without any organic solvent, phase transfer catalyst or additive. The results revealed that the LDH hosted chromium complex exhibited much higher catalytic performance than its homogeneous analogue. Under the optimal reaction conditions, the highest conversion of benzyl alcohol reached 52.1%, with 100% of the selectivity to benzyldehyde.
Study on Kinetics of Nano-Ni(OH)2 Powder Ethanol Desorption Process
Authors: Pan Feng , Li Zai Yuan , Li Chun Ji
Published: August 2014

This paper studies on the thermal analysis kinetics of nanometer powders ethanol desorption process.The DTA-TG-DTG curves obtain by SDT 2960 Simultaneous DSC-TGA analysis apparatus. Under the condition of N2atmosphere operation and rise temperature velocity was 10°C·min-1. The mechanism functionis used to calculate the kinetics factors. Reaction progressionnwas obtained by calculation of the kissinger peak shape factor method. The results showed that the apparent activation energy of nano-Ni(OH)2was 73.210 kJ·mol-1, the pre-exponential factor was 2.349×1012, the reaction progression was obtained as 1.2767, the kinetic equation is
Study on Influence Factors of Cement-Free Binding Material Based on Fly Ash and Slag
Authors: Liu Jin Qiang , Hao Bin , Yu Jian Yuan , Xu Yun Jie
Published: August 2014

The cement-free binding material, namely geopolymer, is a novel binding material made from solid waste such as fly ash and slag activated by the alkali. In this research, orthogonal tests were carried out on 20 x 20 x 20mm cube paste specimens cured at room temperature to explore the rules of influence factors according to the compressive strength for 3d, 7d and 28d. The results revealed that the ratio of fly ash/slag is the most significant factor, the ratio of water/ (fly ash+ slag), the modulus of alkali activator and the dosage of desulfurized gypsum also play great role in strength development of the binder. The compressive strength of the specimens can be obtained to 65.0 MPa and 51.21MPa at maximum for 28d when the ratios of fly ash/slag are 30/70 and 40/60 respectively.
Determination of Ruthenium in Waste Ruthenium-Loaded Carbon Catalyst Samples Using Teflon Pressure Vessel-Assisted Sample Digestion and ICP-OES
Authors: Wei Xiao Juan , Pan Jian Ming
Published: August 2014

A novel method for the determination of ruthenium in waste ruthenium-loaded carbon catalyst samples was established by inductively coupled plasma optical emission spectrometry after samples digested by Teflon pressure digestion vessel with aqua regia. Such experiment conditions were investigated as the influence of sample dissolution methods, digestion time, digestion temperature and interfering ions on the determination. Under the optimized conditions, the limit of detection (LODs) of Ru for tested solution was 9 ng mL-1. The relative standard deviations (RSDs) for Ru was 2.12 % (CRu= 1 mg L-1, n = 7). The linear range of calibration graph for Ru and Zn was 0 ~ 100.00 mg L-1. The proposed method was applied to determine the practical samples with good recoveries and satisfactory results.
Influence of Preparation Time on Electrochemical Impedance Spectroscopy of the Dodecafluoroheptyl-propyl-trimethoxysilane SAMs on Aluminum Alloy 6061
Authors: Wen Yu Qing , Shang Wei , Meng Hui Min
Published: August 2014

The self-assembly membranes (the SAMs) was prepared on aluminum alloy at three different temperatures. The electrochemical properties of Al alloy with SAMs and bare Al alloy were investigated by electrochemical impedance spectroscopy in a 3.5wt. % NaCl solution. The measured EIS data was simulated by an equivalent circuit. The results demonstrated that the Impedance value of 1 h preparation time was greater than the other time. To illustrate, with the preparation time was long, they have not better the performance of self-assembled monolayers.
The Adsorption of Cu2+ onto Chitosan-Aluminium Oxide Composite Material
Authors: Yang Yong Li , Zhao Sheng Guang , Song Chun Guang , Gao Ming
Published: August 2014

Chitosan-aluminum oxide composite material was synthesized through chemical bonds with chitosan and isopropanol aluminum as raw material, whose structure was characterized by SEM. The influence of reaction conditions on adsorption performance were studied, such as temperature, time. Results show that in the composite materials, chemical bonds were existed between aluminum and chitosan, inorganic aluminum oxide evenly dispersed in the surface of chitosan molecular. The adsorption capacity of such composite towards Cu2+ had been greatly improved better than the mixture of chitosan and Al2O3 materials and chitosan .the adsorption rate of Cu2+ was 13% higher than that of chitosan, adsorption capacity is up to 146 mg/g.
The Design and Experimental Study on the Lance of the Cement Industry Flue Gas Denitration Technology
Authors: Zhang Li Juan
Published: August 2014

The lance is the key equipment of SNCR flue gas denitrification technology injection system on the new dry process cement production line.The atomizing effects of reducing agent will directly influence the result of flue gas denitration. In this paper, there are the structure design and experimental analysis on denitration lance.The results show that the lance can ensure the average diameter of atomized particles is from 50 to 55um,uniformly degree is above 80%, and visual distance of atomized ammonia is above 4 meters.It has been applied in a new dry process cement production line of daily 5kt SNCR flue gas denitration project, reaching above 70% of denitration efficiency. These results are valuable for similar new dry cement clinker production line of SNCR denitration Technology.
The Review of the Application of Graphene/Chitosan Composite
Authors: Zhao Jing , Zhang Hong
Published: August 2014

In recent years, with the excellent mechanical properties, good thermal conductivity and electrical conductivity and optical properties, Graphene is widely used in many fields such as chemistry, physics and material science .The preparation of graphene have had a very big progress.This paper reviews the chemical preparation methods of graphene and the application of Graphene / Chitosan composite.Then we point out the outlook of the application of the composite materials graphene with other biological macromolecules which are similar with chitosan.