bluuebunny/crossref_metadata_2025 huggingface dataset:
Self-Propagating High-Temperature Synthesis of Simulated 90SrO-Contained Radioactive Graphite in N2 Atmosphere
Authors: Lu Xi Rui , Su Si Jin , Chen Meng Jun
Published: February 2014

In order to evaluate the performance of the self-propagating high-temperature synthesis (SHS) to treat 90SrO-contained radioactive graphite in N2 atmosphere, waste forms were prepared with the self-developed SHS reactor according to the waste forms formulation designed with a solid-soluted content of 010 wt% (calibrated in mass, hereinafter the same). The waste forms were made with the exothermic reaction (3C + 4Al + 3TiO2 = 2Al2O3 + 3TiC + Q), where, 88SrO (a stable Sr isotope)-containing 88SrO was used to simulate 90SrO. And the raw materials for the waste forms were the powdery materials of graphite (C), aluminum (Al) and titanium dioxide (TiO2). Then, X-ray diffractometer (XRD) and scanning electron microscope (SEM) were used to test and analyze the phase composition and morphology of the prepared waste forms. According to the results in dealing with the treatment with the given exothermic reaction of the 90SrOcontaining radioactive graphite in N2 atmosphere, the SrO solid solubility could be up to 8 wt%. Besides, with a SrO content of 0~2 wt%, the major composition of the waste forms was including: alumina (Al2O3) in diamond scheme, titanium carbide (TiC) in cubic phase, graphite (C), anatase titanium dioxide (TiO2) and aluminum nitride (AlN) in cubic phase. Comparatively, with a SrO content of 3~8 wt%%, the major composition of the waste forms was including: alumina (Al2O3) in diamond scheme, titanium carbide (TiC) in cubic phase, graphite (C), anatase titanium dioxide (TiO2), aluminum nitride (AlN) in cubic phase and rhomboid aluminum titanate (Al2TiO5). Furthermore, diffractive peaks of unidentified phase occurred at 2θ = 7.7°, 15.6°, 19.8° and 24.1° position, whose intensities were increased with the increasing additional SrO content. The grain sizes of the prepared waste forms are mainly within 515μm, majorly exist in pieces.
Void Prediction of Cement Concrete Overly on Old Cement Pavement after Rubblization
Authors: Zhang Yong Ping , Meng Xian Jin
Published: February 2014

Void is a major disease of cement concrete pavement, and it is also the inducement of other diseases. In order to predict the void, this paper quantificational analyzes the relationship between the times of load function and the lost of materials caused by erosion based on the analysis of the shape and height of void. And then it puts forward that the volume of the lost of materials caused by erosion is equal to the void under slab and gets the prediction models of voids beneath slab corner and along longitudinal joint edge. The results suggest that when the void height is less than side length, the prediction model of void beneath slab corner is same to the along longitudinal joint edge. The development of the void only has relationships with the anti-scour performance of the base course material, the ratio of height and size of void, and the times of standard axle load.
Tensile and Cracking Behaviors of Strain-Hardening Cement Composite (SHCC) with Fluosilicate Based Shrinkage-Reducing Agent (SRA)
Authors: Han Seung Ju , Jang Seok Joon , Yu Zhong Jie , Yun Hyun Do
Published: February 2014

This paper provides the results of direct tensile tests for strain-hardening cement composite (SHCC) to investigate the influence of fluosilicate based shrinkage-reducing agent (SRA) on the tensile and cracking behaviors of SHCC material under direct tension. The specified compressive strength of the SHCC material is 50MPa. The adding ratio of fluosilicate based SRA for SHCC material is 2.5 and 5.0%. Two mixitures of SHCC with 2.2% polyvinyl alcohol (PVA) fibers at the volume fraction were mixed; two mixtures with SRA and one mixture of conventional SHCC material. To evaluate the tensile and cracking behaviors of SHCC materials, two dumbbell-shaped tensile specimens for each mixture were manufactured and tested in direct tension. Test results show that the addition of fluosilicate based SRA improved direct tensile and cracking behaviors of SHCC materials with rich mixture. This phenomenon is noticeable for SHCC with higher volume of SRA.
Study on Microcrystalline Chitin Cinnamon Nanoemulsion
Authors: Peng Xiao Qing , Wei Min Jie , Wang Liang , Gu Li Peng
Published: February 2014

To improve the miscibility of cinnamon oil with water, this study uses microcrystalline chitin as the surfactant to prepare cinnamon oil nanoemulsion. Firstly, use isopropyl alcohol and concentrated phosphoric to act with chitin, disperse molecular crystal structure of chitin, and then use hydrochloric acid for decalcification, and prepare microcrystalline chitin through centrifugation, washing, freezing and drying. Dissolve it in acetic acid solution as emulsification, and dissolve cinnamon oil in anhydrous ethanol, and mix both of which to obtain emulsion by drops. Judge the emulsification process and results of microcrystalline chitin on cinnamon oil through conductivity data. The conductivity decreases gradually to 0 from 1.4μS·cm-1. At room temperature, the solution is aqueous liquid without stratification and precipitation, but has good stability.
Research on the Optimization Helix Angle of Double-Helical Baffles Heat Exchangers
Authors: Zhao Zhong Chao , Mi Hao Jun , Cheng Hua , Feng Wei Xian
Published: February 2014

To investigate the relationships between heat transfer coefficient and baffle helix angle of double-helical baffles heat exchanger, the physical and mathematical model of double-helical baffles heat exchanger with different baffles helix angle were developed and carried out. The researched results show that the optimization baffles helix angle results in the highest heat transfer coefficient of double-helical baffles heat exchanger; the inlet flow flux of shell side has no effect on the optimization baffles helix angle for those heat exchanger with same heat transfer structure; The optimization baffles helix angle tends to decrease with the tube diameter increment of double-helical baffles heat exchanger.
Progress of High Purity Magnesium Oxide Preparation
Authors: Luo Bi Jun , Wu Dan , Wang Li Cong , Huang Xi Ping
Published: February 2014

The research status of high purity magnesium oxide preparation is introduced in this paper. First, process for preparing high purity MgO is summarized, the global and domestic production status of high purity magnesia is also described. Finally, the problems and disadvantages of current MgO preparation methods are concluded, also development direction of preparation method basing on brine utilization in the production of MgO is put forward.
A Continuous Semigroup Approach to the Distributional Stability of Nonlinear Models
Authors: Sun Xi Ping , Luo Min , Fang Kai
Published: February 2014

We prove the existence of an invariant measure for the continuous semigroup associate with a nonlinear model under the compact set Lyapunov condition. Further,adding the ergodicity of the semigroup operator, we prove the asymptotic stability in distribution for the semigroup. We give a criteria of the asymptotic stability in distribution for the type of evolution equation having a linear generator. Our method is based on continuous semigroup and its generator.We illustrate the result by the Lorenz chaotic model and prove the existence of the natural invariant measure for Lorenz chaotic model.
Based on Vari Combination Forecasting Model for Power Plant Flue Gas Oxygen Contentance-Covariance Method
Authors: Zhan Teng Xi , Peng Jiao Li , Tu Bing
Published: February 2014

Focusing on the problem which power plant flue gas oxygen content is hard to predict efficiently, an intelligent hybrid prediction method is proposed. First, the RBF neural network and principal component analysis method are utilized to reduce the dimension of the input variables. Second, the case-based reasoning method is carried on to predict the flue gas oxygen content based on the above analysis results. Then, in order to reflect the cumulative effect of the flue gas oxygen content with time, the GM (1, 1) grey prediction method is used to predict the current flue gas oxygen content value. Finally, the final flue gas oxygen content is obtained by the variance-covariance method of weight combination forecasting. Simulations and industrial results show that the proposed intelligent hybrid prediction model has high accuracy and robustness, and can solve the problem of predicting the flue gas oxygen content effectively.
Application of Kalman Filter in AUV Acoustic Navigation
Authors: Ji Chang Lin , Zhang Ning , Wang Hai Hui , Zheng Cui E
Published: February 2014

LBL(Long Baseline) positioning provides an important positioning and navigation method for AUV(Autonomous Underwater Vehicle)’s underwater task. Due to the complex underwater acoustic channel, and its poor anti-interference ability, a new feedback Kalman fiter algorithm was present in this paper. By combining travel time information with position information, the state of AUV was estimated accurately. By analyzing experimental results, it showed that the LBL positioning accuracy was improved, and the algorithm ensured AUV complete its autonomous navigation with high precision.
Design of High Stability of DDS Signal Source for Laser Frequency Shift
Authors: Huang Yang , Chen Yong Tai , Cheng Long , Sun Chang Jing
Published: February 2014

Acousto-optical-Modulator (AOM)'S characteristics of shift frequency can be used to change the frequency of laser, the performance of AOM will improve directly by a high stability driving signal source. The paper presents a design of high stability of DDS signal source for laser frequency shift, the signal source output frequency range of 50MHz-400MHz. Using atomic frequency standard and external frequency multiplier as the reference source of DDS to make its frequency stability reaches , using sub-octave filter to get a high output signal spectral purity.
SIWPSO-Based Controller Design for AUV
Authors: Perng Jau Woei , Huang Yi Shyang , Huang Shiang Shiuan , Chen Guan Yan , Chen Chin Yin , Yang Ya Chao
Published: February 2014

A strategy is proposed for a control system with a linearized autonomous underwater vehicle (AUV) dynamic model. The proposed approach combines the particle swarm optimization (PSO) and proportional-integral-derivative (PID) controller to adjust the parameters of the linearized dynamic model. The linear and nonlinear model are both considered in our work. The proposed techniques is verified by using the simulation results to the model of AUV.
The Research of Intelligent Fault Diagnostic System for Diesel Engine Based on Virtual Instrument
Authors: Hu Dan Feng , Qian Min , Chen Ling Ling
Published: February 2014

Introduced the system structure, working principle and diagnostic algorithm of a data acquisition and fault diagnostic system for diesel engines. The system is composed of a portable computer, a multi-channels data acquisition device and some sensors. Through behavior of the diesel and the characteristic values of signals, we can finish the non-disassemble examining and fault diagnosing. The structure and policy of the diagnostic expert system are also discussed.
An Improved Algorithm on Point Cloud Optimization for Unmanned Aerial Vehicles
Authors: Yang Nan , Shao Zhen Feng , Guo Bing Xuan , Peng Zhe , Huang Lei
Published: February 2014

It is hard to keep vertical photography for Unmanned Aerial Vehicles (UAV) and there is large deflection and rotation in the UAV image, which lead to accuracy of point cloud data produced by UAV image is not high. In this paper an algorithm on UAV point cloud optimization based on Patch-based Least Squares Image Matching is proposed. By optimizing the point cloud data with Patch-based Least Squares Image Matching, and test data with images in campus of Northwestern University. The experimental results show that UAV point cloud optimization based on Patch-based Least Squares Image Matching can conspicuously improve the accuracy of the UAV image matching.
Sustainable Supplier Selection: An International Comparative Literature Review for Future Investigation
Authors: Zhang Da Wei , Abdul Hamid Abu Bakar , Thoo Ai Chin
Published: February 2014

Supplier selection is a wide research area which has been explored conceptually and empirically. The criteria and decision-making methods of supplier selection have been investigated by a series of surveys dating back to the 1960s, and both of these issues are the focus of this study. Sustainable supply chain management is a forward-thinking idea which considers the environmental effects and the efficiency of resource utilization in the whole supply chain. Thus, this part will review the supplier selection literature with special focus on the background of sustainable supply chain. And then based on the literature review, the research gaps will be conducted for more in depth research in this study.
Study on Community Structures in Manufacturing Grid and the Algorithm for Community Partition of its Resource Nodes
Authors: Yin Yong , Li Yu , Zhang Chao Yong
Published: February 2014

The Manufacturing Grid supplies a public platform for global resource sharing, collaborative design and manufacturing; its resource nodes constitute a complex network. Community partition of the complex network composed of the manufacturing resource nodes may be of some benefit for the sharing of manufacturing resources efficiently. In this paper, the resource nodes in the Manufacturing Grid are treated as the nodes of the complex network and the node-to-node link as its edges or arcs. The features of the resource nodes are analyzed based on which a model of the complex network composed of resource nodes in the Manufacturing Grid is set up. The nature phenomenon of the community structure in the complex network of manufacturing resource nodes is described according to the division of the manufacturing task into subtasks. Referring to Newmans idea, a criterion to evaluate the partition of community structure is discussed. Then, an improved algorithm based on Newman's Fast Algorithm is put forward to partition the community. The algorithm fully considers the characteristics of the direction and weight in the complex network for manufacturing resource nodes. Examples show that the algorithm presented in the paper can partition the community with favorable results.
Study on the Multi-Tooth Meshing Bending Strength for Involute Gear Drive with Small Tooth Number Difference
Authors: Feng Xiao Ning
Published: February 2014

This article has established numerous entity assembly models of internal gear pair with small tooth number difference of stub gear, then calculates the bending stress of multi-tooth meshing by means of FEM, determines bending strength factor of multi-tooth meshing, and forms the calculation method of bending strength based on influence by multi-tooth meshing.
Fabrication and Experimental Investigation of a Novel 3D Hydrodynamic Focusing Micro Cytometric Device
Authors: Wang Yong Quan , Wang Jing Yuan , Chen Hua Ling
Published: February 2014

This paper presents the fabrication of a novel micro-machined cytometric device, and the experimental investigations for its 3D hydrodynamic focusing performance. The proposed device is simple in structure, with the uniqueness that the depth of its microchannels is non-uniform. Using the SU-8 soft lithography containing two exposures, as well as micro-molding techniques, the PDMS device is successfully fabricated. Two kinds of experiments, i.e., the red ink fluidity observation experiments and the fluorescent optical experiments, are then performed for the device prototypes with different step heights, or channel depth differences, to explore the influence laws of the feature parameter on the devices hydrodynamic focusing behaviors. The experimental results show that the introducing of the steps can efficiently enhance the vertical focusing performance of the device. At appropriate geometry and operating conditions, good 3D hydrodynamic focusing can be obtained.
A Data Center Energy-Saving System and Method Based on Virtual IT Resource Distribution Technology
Authors: Liang Yan , Wang Fu Qiang , Li Gang , Fang Xing , Ge Chang Rong , Zhao Xin Yan
Published: February 2014

A data center energy-saving system and method based on virtual IT technology resource distribution technology is proposed in this paper. Through monitoring virtual environment resources in data center, the limited IT resources can be dynamically migrated and the auxiliary equipment resources such as air conditioner can be rationally managed. Then the resources can be reasonably and efficiently allocated by monitoring the virtual environment. With a closed-loop feedback control mechanism, it effectively improves the utilization of data center resources, and ultimately achieves the operation and maintenance for data center of green energy-saving target. This method was implemented in a true data center for cloud computing. Test results show that the total energy consumption of this system can be reduced by 13%, and the power usage effectiveness drops to 1.5.
The Research on Energy-Saving Strategy of WSN in 220KV Substation
Authors: Chen Shao Hua , Zhang Wei , Liu Wei , Fan Yi , Wu Ming Ze
Published: February 2014

Aiming at the power problem of the wireless sensor network system in a 220KV substation, research about energy-saving control strategy in wireless monitoring system was described from the design of the microcontroller high-speed working mode and an optimization of RF module starting sequence. In the end, a wireless temperature measurement platform including three wireless senor nodes and a gateway node was realized. Results from the experiment make clear that the presented research strategy was provided with favorable energy conservation feature and can be suitable for wireless sensor network system in a 220KV substation.
Design of High-Speed Laser Ranging System Platform Based on FPGA
Authors: Lv Qiong Ying , Liu Kun
Published: February 2014

This article describes an approach based on FPGA technology and application speed galvanometer technology for high-speed moving objects in real-time and accurate laser ranging system platform design. Laser Ranging has high accuracy, good collimation, good anti-jamming Intuit points, and use high integration, operation speed of FPGA chip for data acquisition and processing.Speed galvanometer technology to ensure the entire system platform can continuously measure the distance to the high speed moving object information. The entire system ensures that the measured object in rapid motion state, the measured data in real time and accuracy.
Study on Contrastive Experiment of Full-Scale Concrete Beam Strengthened with Near-Surface-Mounted and Externally-Bonded Carbon Fiber Plate
Authors: Li Yi Hui , Wang Xiao Pin , Jia Qiao Yan , Zhou Chao Yang
Published: February 2014

The carbon fiber has been widely applied in the building reinforcement because of its light weight, high strength, good viscosity, heat resistance, corrosion resistance, anti-fatigue, easy to be cutting and constructed, etc. Considering the FRP strengthened experimental data of large and full-scale concrete beam is relatively insufficient, in this paper, two strengthening methods, namely, near-surface-mounted and externally-bonded carbon fiber plate, are used for of contrastive experimental study of eight full-scale concrete beams, to analyze the influence of two strengthening methods on bearing capacity, deformation and failure mode of concrete beam, etc.The analysis results show that two strengthening methods can improve the mechanical behavior of concrete beam, its yield load and ultimate load, and delay the crack development.The externally-bonded strengthening method, however, has a high request for bonding technique, otherwise, the debonding and failure easily occur; while the near-surface-mounted strengthening method can effectively avoid the failure, and give full play to the high strength of carbon fiber plate, so this kind of strengthening method should be generalized and wildly applied.
The Application and Development of Composite Material Detection Using Dry Coupled Acoustic Technology
Authors: Li Jian , Ai Chun An , Wang Xue Ren , Zhang Xiao Jun
Published: February 2014

This paper focus on the method of composite material detection, and five dry coupled acoustic technologies are introduced, which are dry pressure coupling method, acoustical impedance method, Local percussion method, air-coupled ultrasonic method and ultrasonic fixed spacing pitch-catch method. The principle, character and application of these five methods are discussed, and the development trend of dry coupled acoustic technology is previewed.
An Analysis of Electromagnetic Sheet Metal Forming Process
Authors: Paese E. , Rosa Pedro A.R. , Geier Martin , Homrich Roberto P. , Rossi R.
Published: February 2014

Electromagnetic forming (EMF) is a high-speed forming process that uses energy density of a pulsed magnetic field to deform metallic workpieces. This paper presents a method to calculate the electromagnetic force in thin flat plates using a flat spiral coil as an actuator. The method is based on the Biot-Savart law, and the solution of magnetic induction integral equations is performed inside Matlab®by a numerical method based on discretizing the EMF system in a system of ordinary differential equations that couple the electric and magnetic phenomena. Free bulging experiments and a comparison with Ansoft Maxwell®software are presented demonstrating a good correlation with the proposed implementation.
Modal Analysis of a Electric Tool
Authors: Wei Hai Wei , Wang Yu , Gao Qiang
Published: February 2014

People have paid more and more attention to green production and environmental protection along with the gradually improved of the productivity level and the increasing of the production conditions. As the widely used of the hand-held electric tools like electric angle grinder and electric drill in the daily production, the environment around will be influent by the vibration and noise of the surface of the electric tool when using the electric tools .Therefore, it is very important to analyze the vibration performance of the whole electric tool. In this paper, the finite element method is used for modal analysis. A vibration response experiment of the same electric tool working under no-loading condition is done to obtain the time-history acceleration response. A conclusion is obtained that the first order natural modal and the fifth order natural modal are motivated when electric tool working under no-loading condition.
The Mechanical Properties of Cement Reinforced Loess and Pore Microstructure Characteristics
Authors: Liu Hong Mei , Wang Lan Min , Gao Peng
Published: February 2014

Natural deposit of loess has large pores and weak cementation, resulting weak shear strength and large deformation under external stress, which is the major engineering problem of the loess ground. By adding suitable amount of ordinary Portland cement to treat the loess can increase the shear strength to meet the needs of ground safety. In this study, triaxial test is carried out to evaluate improvement of the unconfined compressive strength and shear strength of loess after adding certain amount of Portland cement, also by scanning electron microscope observation and analysis of SEM images using image processing system, it is found that the cement improved microstructure of loess, increased clay content and enhanced cementation, thus increased the shear strength.
Study on Development Techniques of AR Application Program in MFC Environmen
Authors: An Jun , Fan Jin Song
Published: February 2014

Augmented Reality(AR) technology aims to integrate virtual objects with real scene by using computer technology and to realize real scenes enhancing. This paper presented a research method of using osgART to develop AR application programs in MFC (Microsoft Foundation Classes) environment, and discussed some related techniques. Corresponding procedures are given in each section, and a design example for product evaluation and exhibition is presented. This example was developed by the presented method in this paper, and its system ran in good condition after repeated tests. From the results of this paper, it can be seen that by using MFC and osgART to develop AR application programs, the seamless integration and interaction between the real environment and virtual objects can been easily realized, which will be benefit to improve the efficiency of developing AR application programs.
Carbon Fiber Reinforced the Cracking Framework Top Side Columns Caused by Roof Temperature Deformation
Authors: Zhang Wei
Published: February 2014

An example of horizontal cracks on the surface of reinforced concrete side-columns is presented. Based on the finite element analysis , a conclusion is made that those cracks are caused by the frame’s deformation under changing temperature. Then the way to calculate the width of such cracks is raised. The design method for the reparation by sticking carbon fiber materials to the column is also developed. Those methods are applicable in realistic works.
A New Wire Icing Automatic Monitoring System Based on Wireless Communication Platform
Authors: Wang Chun Lei , Chen Bai Lian , Zheng Li Bing , Fang Hua Chao , Han Li
Published: February 2014

In view of the wire icing field monitoring in the process of the field data acquisition is difficult in the southwest mountainous area in Guizhou, the first generation of the present situation of the system operation reliability is not high, a new generation of automatic field wire icing monitoring system has been developed. The new generation of the system adopts ARM/Linux platform, Ice data can be sent via wireless transmission. With the digital acquisition mode of the System sensor, new system can monitor wire icing state stably, continuously. Data collected by GPS can be sent to the remote server of meteorological department which can provide data support for wire icing forecast. From November 2010 to March 2013, the new generation of wire icing monitoring system was carried out three times field test in Meihuashan,Weining field site test points, Kaiyang weather service stations and Wanshan SAR weather service stations in Guizhou. Results show that the system meets requirement of field site test and have further promotion value in the wire icing test requirements area.
Material Demand Forecasting: An ERP System Perspective
Authors: Relich Marcin , Witkowski Krzysztof , Saniuk Sebastian , Sujanova Jana
Published: February 2014

This paper investigates various problems associated with the parameter specification for material requirements planning (MRP) in a typical ERP system. The choice of a suitable MRP procedure and its parameters can reduce excessive quantities of materials and, consequently, cost. The proposed approach is dedicated for MRP procedure based on the forecasting of material demand and inventory that can be obtained with the use of techniques for nonlinear function identification, such as fuzzy-neural system and neural networks. An example is presented which compares the different forecasting models for material demand and inventory.
Numerical Modeling on Low Velocity Impact on a Foam Core Sandwich Panel
Authors: Xie Zong Hong , Yan Qun
Published: February 2014

This paper introduces a kinetic model to simulate a foam-core composite sandwich panel impacted by a solid semi-sphere. A modified Hashin failure criterion, which consider failure modes of fiber breakage, matrix cracking and matrix crushing, are implemented into the model analysis by using a self-developed VUMAT subroutine. Cohesive elements with zero-thickness are used in the composite laminates model and quadratic nominal stress criterion is used to predict the delamination initiation during the impact. A crushable foam model is used for foam core. The time history curve of contact force is obtained and shows a good correlation with the experimental data.
Study on Aftershocks Triggering by Static Stress Changes of the Minxian-Zhangxian 6.6 Earthquake
Authors: Liu Fang Bin , Wang Ai Guo
Published: February 2014

On July 22, 2013, an Ms6.6 earthquake occurred in Minxian-Zhangxian, Gansu Province, China, which caused serious damages. Because of the abundance and clear relationship with the main shocks, aftershocks sequences are typical types of behavior and provide useful data sets. To better understand the aftershocks triggering by static stress changes of the main earthquake, based on Okada’s elastic half-space model, we used accept fault plane consistent with the source and accept fault plane as the optimal models to calculate the stress changes on aftershock focuses by the Minxian-Zhangxian 6.6 Earthquake respectively. The results show that the latter model is better than former, more than 90% of aftershocks located in NWW and SEE, the stress increased areas, which is consistent with strike of Lintan-Tanchang fault (LTF), in other words, the Coulomb static stress changes of the main shock can induce the aftershocks.
Research on the Regular between Concentration of Superfine Powder Extinguishing Agent Explosion Scatter and Fire-Extinguishing Ability
Authors: Yang Li , Zhao Qian Li , Chai Xiao Dong , Ma Xiao Ying
Published: February 2014

In order to improve high-rise fire-extinguishing efficiency and reduce fire-extinguishing cost, a mathematical model of explosion and dispersion of extinguishing agent was built by using AUTODYN on the basis of isentropic expansion law of detonation outcome and theory of hydrodynamics to simulate the dispensing process of high-rise superfine powder fire-extinguishing agent. Different locations on the high-rise fire-extinguishing bomb were selected to be Gauss points and then were analyzed, all calculating results were contrasted finally. A method used for evaluating fire-extinguishing efficiency of fire-extinguishing bomb was put forward according to the analysis of agent concentration of different moment that it was dispensed, which was referentially meaningful to study the extinguishing efficiency of extinguishing agent.
Review of Conductive Coating and its Application in Power Grounding System
Authors: Li Xu Zhi , Xu Song , Yi Qin , Feng Bing , Hu Bo Tao
Published: February 2014

The research progress of conductive coating was introduced. The advantages and disadvantages of the latest technologies of filler modification and coating preparation were all analyzed. The application in power grounding system and research focus in future of conductive coating were explained and predicted respectively, indicating that conductive coating with high conductive performance and being economic and environment friendly would be the main development target in future.
Analysis of Micro Structure and Elastic Property on 3-D Tubular Woven Carbon Fiber Composite
Authors: Sun Zhi Hong , Chen Yang , Zhou Shen Hua
Published: February 2014

For the further research of 3D tubular woven carbon fiber composite, a unit cell division method and a mechanical model were put forward to predict the engineering elastic constants. The model adopted raceway shape as the yarns cross-section, and prediction methods of volume fractions and elastic modulus were established based on the micro structure and geometric parameters of the yarn. Then the finite element method was used to analysis the mechanical behavior under the circumstances of axial-tensile load, and the stress state was revealed. The results shows that the predicted values using finite element method agree well with the theoretical calculation values, thus the model and analysis method of elastic constants is verified.
Experimental Research of Workpiece Temperature in Orthogonal Turn-Milling Compound Machining
Authors: Liu Yi Zhi , Peng Fang Yu , Lin Sen , Yan Rong , Yang Sheng
Published: February 2014

Workpiece temperature in orthogonal turn-milling compound machining was studied with experimental method in this paper. The orthogonal turn-milling process was simulated through engagement of a milling tool and cylindrical surface on a five-axis milling center. The cutting parameters were designed into an orthogonal parameter table of seven factors three levels based on factors having effects on workpiece temperature. Variance analysis of data achieved from this experiment was carried out and conclusion about the order of effects each factor has on workpiece temperature was drawn.
The Effect of Cutting Process Parameters on the Stability in Milling
Authors: Hsiao Te Ching , Huang Shyh Chour
Published: February 2014

In the milling process, the dynamic system in the cutting process is composed of the tool, workpiece, and machine tools themselves. Therefore the mill geometric parameter, workpiece material behavior, and the modal parameters of the cutting system all will influence the stability in milling. Using FLN method and convolution force model to predict the chatter stability of milling process, and discussing the effect of milling parameter on the stability in this article. According to the result: with the increase of the tool diameter, stiffness, damping ratio or the reducing of tangential cutting force coefficient and radial width of cut, the stability lobe diagram tends to move upward. With the increase of natural frequency, the stability lobe diagram tends to move to right side. With the increase of the number of tooth, the stability lobe diagram tends to move downward.
Effect of Alumina Bubbles on Mechanical Properties and Microstructure of Metal Bond for Superabrasive Grinding Wheels
Authors: Ma Chang Yu , Ding Wen Feng , Chen Zhen zhen , Su Hong Hua , Fu Yu Can , Xu Jiu Hua
Published: February 2014

Effect of the pore size and volume fraction of alumina bubbles on the mechanical properties and microstructure of metal bond for superabrasive grinding wheels were studied by means of single factor test. The results showed that the mechanical strength reduced with the increase of bubble size and volume fraction of alumina bubbles. The morphology of the center section of the binder matrix showed that the higher the volume fraction of alumina bubbles was the less the effective area rate of the matrix was. Additionally, the bigger the bubble size was the more inhomogeneous the bubbles distributed. The pores generated after the fracture of the alumina bubbles had a regular shape and size which satisfied the chip space requirement of the wheels. At last, the failure condition of the bond matrix was established, which indicated that the strength of the bond matrix is mainly related to the effective area rate and the homogeneity of the bubble distribution.
Study on Arc and Drop Transfer Behaviors of DCEN MAG Welding
Authors: Wang Xu Ming , Bi Qing Xia
Published: February 2014

By means of the high speed camera, the arc and drop transfer behaviours of direct current electrode negative MAG welding process are researched. The influences of luminous arc ball on the stability of MAG welding process are analyzed. On this basis, the process interval of DCEN MAG welding is determined. And the influences of wire polarity on wire melting coefficient are compared. By using the shield gas 98%Ar + 2%O2, the stable drop transfer manner can be divided into two kinds: dropwise transfer with low current, and streaming transfer with high current.
The Preparation of Porous TiO2 Nanostructure by Triblock Copolymers Co-Templating Method of TiOSO4 Solution Derived from Ilmenite Ore
Authors: Yuwono Akhmad Herman , Latifa Hanum , Sholehah Amalia
Published: February 2014

Porous titanium dioxide (TiO2) nanostructure has been successfully synthesized by a modified solgel method using non-ionic triblock copolymer pluronic F-127 as surfactant template and titanylsulfate (TiOSO4) solution as the inorganic precursor derived from the sulfuric process of Bangka-Indonesia ilmenite ore. The resulting nanostructure samples were characterized by XRD, SEM, TEM and UV-Vis spectroscopy. The results showed that porous titania particles have sphere-like shape and can be indexed as the anatase phase with average crystallite size of about 5-7 nm, narrow pore size distribution with an averange pore diameter of about 3-5 nm and band gap energy in the range of 3.10 3.16 eV.
The Grey Relation Analysis of Hemp Fiber Fineness and Chemical Composition after Plasma Assisted Degumming
Authors: Yin Di , Ji Ying Chao , Wang Ying , Li Hong
Published: February 2014

The plasma was used to assist hemp fiber degumming. After degumming, the relationship of the hemp fiber fineness and chemical composition was analyzed through the Grey Relation Analysis. The results indicates that pectin content is bigger than hemicellulose and lignin content on the influence of hemp fiber fineness, and the influence of cellulose content is small. This conclusion is consistent with the actual production and the experience of technical personnel.The pectin, hemicellulose, and lignin are therefore the main content to be removed in the plasma assisted degumming.
Size-Dependence of Photoluminescence Property of ZnO Nanoparticles
Authors: Wang Xiao Fang , Fang Yun Liang , Li Tian Le , Wang Fu Juan
Published: February 2014

Nanometer-sized ZnO crystals with the diameter from 20 nm to 110 nm were prepared by homogenous precipitation method (HPM). The photoluminescence (PL) spectra of as-prepared nanoparticles under excitation at the wavelength of 320 nm were detected. The PL spectra were fitted with Gaussian curves, in which a good fitting consisting of six Gaussian peaks was obtained. We observed that the multi-peak centers do not change much, while the relative amplitude of Gaussian combination to the band-to-band emission decreases rapidly with the increased grain size. It shows that the broadband emission at the lower energy is associated with the surface states.
The Influence of Transient Casting on Inclusions in Steel
Authors: Wang Yan , Li Chao , Wang Shuo Ming , Wang Ruo Si
Published: February 2014

Influence on the transient casting of large inclusions in steel were studied by means of tracer method, kinds of steel large inclusions content in transient casting is 1.5 times ~8 times to the steady casting, large inclusions principal from crystallizer mold powder entrapment, then the tundish slag and the ladle slag. Slag and refractory has a certain influence on high quality steel. Reducing fluctuations caused by transient casting is the key to improve the quality of the steel.
The Optimization of the Temper Technology of Production about Soft Steel
Authors: Tang Wei , Shen Yan Zhi
Published: February 2014

As the competition for steel department becoming fierce, the custom bring forward more district requirement. When deal with the quality dissidence, jingtang company find many dissidence is result in elongation does not meet the set point, bring too much economic damnify. So the author analyzed the technology of elongation and the control system, tested the stiffness of the tempermill, finally optimized the control system and the minimum roll force and the tension of temper according the analysis result, find a property technology for this kind of strip to product.
Influence of Oxide Morphologies on the Galvanizability of the Third Generation Automotive Steel
Authors: Jiang She Ming , Feng Shi Jie , Li Zhen Hua , Zhang Qi Fu
Published: February 2014

Focusing on improving the galvanizability of the third generation automotive steel, the effect of surface oxides morphologies on the galvanizability was studied. The results show that the surface oxide types of sample steels by XPS analysis after annealing in different conditions are the same, only MnO and Cr2O3 were detected and no complex oxides exist on the surface. Morphologies of surface oxides can greatly influence the galvanizability of the third generation automotive steel, nodule-like oxides surface can contribute to better wettability and inhibition layer than vitreous film-like oxides surface. Galvanizing panels of nodule-like oxides surface steels only show pinhole-sized bare spots, while panels galvanized from vitreous film-like oxide surface steels reveal larger areas of bare spots and uncoated areas. Inhibition layer observed in galvanizing panels of nodule-like oxides surface steels are compact but not homogeneous, some inhibition layer grains are fine, and others are coarse. While the inhibition layer grains of panels galvanized from vitreous film-like oxide surface steels have a non-compact morphology with some particularly fine equiaxed crystals which developed deficiently.
Effect of Austenitizing Processes on Isothermal Quenching Microstructure in Bearing Steel
Authors: Tian Lei , Li Sheng Li , Liu Ji Zhi , Zhang Xiang Hai
Published: February 2014

Austempering was applied to bearing steel to improve the performance. The effect of austenitizing temperature and time on isothermal quenching microstructure in bearing steel was investigated via microstructure observation and fracture analysis. The results show that with the increase of austenitizing temperature, the size of bainite plate and residual austenite content increase. Austenitizing at lower temperature, the samples has a fracture composite fracture morphology of polygon cleavage unit and even small dimple.The fracture morphology of sample austenitized at 1050 °C is quasi-cleavage fracture with bar cleavage unit which is corresponding to the coarse acicular microstructure. the size of bainite plate increase with increasing the austenitizing time. As the result of comprehensive effect of fine grain strengthening and dispersion strengthening, that the microhardness firstly increases, and then obviously decreases with the increase of austenitizing time.
Microstructure and Compression Deformation Behavior in the Quasicrystal-Reinforced Mg-6Zn-2Y Alloy Solidified under Super-High Pressure at Room-Temperature
Authors: Han Xiu Mei , Dong Yun , Zhao Tian Bo , Lin Xiao Ping , Luo Jing , Yang Hui Guang
Published: February 2014

The microstructures of the Mg-6Zn-2Y alloy solidified under high pressures were investigated using scanning electronic microscopy (SEM) and X-ray diffraction (XRD). The room-temperature compression behavior was analyzed through experiments, showing that the microstructures of the alloys are consisted of α-Mg and quasicrystal I-Mg3Zn6Y phases. With solidification pressure increasing, the microstructures were refined, and the morphologies of the inter-dendritic secondary phase were improved from continuous networks into long-island and granule. The compression strength, yielding strength and compressibility were increased significantly corresponding with solidification pressure, from 259.02 MPa, 230.39 MPa and 18.3% under ambient pressure to 361.43 MPa, 272.25 MPa and 33.1% under high pressure of 6 GPa. The cleavage planes are flat, and the cleavage steps are straight under ambient pressure. However, the cleavage planes are small and rough under 4-6 GPa; tearing dimples occur in the tearing area, indicating that the degree of cleavage fracture decreases under high pressure.
Microstructure and Properties of the Dispersion-Strengthened Cu-ZrO2 Composite for Application of Spot-Welding Electrode
Authors: Xu Yu Song , Jin Cui Ping , Li Peng , Xu Yun Hua
Published: February 2014

This paper prepared Cu-ZrO2 composite by a modified internal oxidation in order to improve the high temperature strength of resistance Spot-welding electrode. The results showed that with the increasing of the cold deformation, Hardness increased while electrical conductivity decreases. Hardness reached 100HV and electrical conductivity was up to 86%IACS after cold drawn in 56%. With the increasing of annealing temperature and annealing time, Hardness of the composite decreased more slowly compared with the conventional Cu-Cr-Zr alloy and was higher than that of the Cu-Cr-Zr alloy after annealed above 700°C for 2h and at 600°C for 5h , which was attributed to the dispersion strengthening effect of the Zirconia particles. Thus, the Cu-ZrO2 composite has good high-temperature stability and can be used for the electrode
Dynamics of Phase Transformation in Cu-Cr-Zr Alloy
Authors: Peng Li Jun , Xie Hao Feng , Huang Guo Jie , Yang Zhen , Mi Xu Jun , Xiong Bai Qing
Published: February 2014

Dynamic of phase transformation has been investigated through the measurement and analysis of relationship between electronic conductivity and the volume fraction of precipitates in the aging process of Cu-Cr-Zr alloy. According to above experiment, the Avrami empirical equation and electronic conductivity equation can be respectively confirmed at different aging temperature. S-curve of the dynamic for phase transformation at different temperature and C-curve of isothermal transformation for the Cu-Cr-Zr alloy are obtained.
Research on the Microstructure and Properties of Hypereutectic Al-Si Alloy for Semi-Solid Forming during Heat Treatment
Authors: Fan Xiang , Yang Yi Tao
Published: February 2014

The heat treatment process of a kind of hypereutectic aluminum silicon alloy which is suitable for semi-solid forming and the change of microstructure and performance during the process of heat treatment had been studied in this paper. In order to guide the heat treatment process, the phase diagram of the alloy had been calculated by the software of Thermo-Calc, and the theoretical solid and liquid line had been gotten. Twelve kinds of heat treatment process had been selected in this study. Finally the best process which the solution temperature is 495°C for 2h and aging temperature is 160°C for 8h had been gotten.
Effect of Ti on the Structure and Properties of Cu-15Ni-10Mn Alloy As-Cast Smelted at Atmosphere
Authors: Cai Wei , Wu Yu , Yin Ji Zhong , Wang Gang , Yang Sheng Li , Wang Chen Xu
Published: February 2014

Cu-15Ni-10Mn alloy as-cast, which smelted at atmosphere, has a typical dendrite structure in Ni segregation characteristics. The content of Ni is higher on dendrite arms spacing than on the dendrite arms, but the content of Mn is less than on the trunk. Due to the Mn oxides easily, the processing performance of alloy as-cast cant meet the requirement of metalworking. The gas content of ingots can be reduced by adding a small amount of zinc during smelting, and the metalworking features can be improved by adding trace Ti that will refine the arms of alloy. The research results show that the grains of Cu-15Ni-10Mn alloy as-cast can be refined by tiny amount of Ti. The grain size decreases with the increase of the content of Ti, the branches size of alloy adding 0.2% Ti is about 30μm that is only 49.4% the size of the alloy without Ti. Titanium, copper and Nickel can form compounds of CuNi2Ti. The hardness peak of alloy with 0.2%Co is 114Hv that is 8% higher than the alloy without Ti. The electrical conductivity of Cu-15Ni-10Mn alloy as-cast waves not clearly.
The Measured Change in d-Electron of Ni in Ni-7.2at%Ti Alloy Studied by Electron Energy Loss Spectroscopy
Authors: Yang Wei Guo
Published: February 2014

A Ni-7.2at%Ti alloy was prepared and thed-electron occupancy of Ni was measured from electron energy loss spectroscopy (EELS) of nickel. The results showed that the white-line intensity of Ni EELS and thed-electron occupancy of Ni in Ni-7.2at%Ti alloy did not change significantly relative to pure Ni.
Effects of Additives on the Surface Layers of Boronized TC4 Titanium Alloys
Authors: Wang Li Na , Li Feng Hua , Dong Meng Ge , Li Ying Nan
Published: February 2014

The boronizing experiments on the surface of Ti-6Al-4V (TC4) titanium alloys were based on solid powder method. Different additives were added into the boronizing agent. The morphologies of surface layers on titanium alloys were observed in scanning electron microscopy (SEM). The phase compositions of boronized layers were analyzed by X-ray diffraction (XRD). The wear resistance properties of boronized TC4 were determined by the friction and wear testing machine. The results showed that all the boronized layers were composed of TiB2and TiB dual phases.When 5%Fe3O4was added into the boronizing agent, the boride layer contained more TiB2compound and was thicker than those with the addition of 5%Na2B4O7.