bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Uptake and Accumulation Characteristic of U and Cd Combined Stress for Wheat
Authors: Zhang Yan , Wang Dan
Published: March 2013

Water culture experiment was adopted to investigate the effects of U and Cod combined stress at different concentrations on the uptake and accumulation of U and Cod and physiological and biochemical characteristics in wheat seedlings. The experiment results showed that the U and Cod uptake by wheat seedlings was higher in roots than in aboveground parts when the total concentration of U and Cod was 5 mg/kg or 20 mg/kg, and the transfer factors (TFs) of U and Cod in wheat seedlings were above 1 when the total concentration was 100 mg/kg. But low concentration of U and Cod were rarely accumulated in wheat seedlings, indicating that wheat seedlings have good tolerance to U and Cod combined stress at low concentration. The experiment results also showed that with the increase in the total concentration of U and Cod, the root activity of wheat seedlings first increased and then decreased, and it exhibited a significant increase when the concentration was 20 mg/kg. Also, with the increase in concentration, the chlorophyll content of wheat seedlings first increased and then decreased, while the SOD activity first decreased and then increased.
Study of Gold Mine Exploration and Metallogenic Regularities
Authors: Wang Ying Peng
Published: March 2013

Laozuo mountain,located on the junction of the city of Shuang Yashan and Qi Taihe,from which a large-scale vein gold deposits was discovered in the in the 1980 s. And gold mining point was established on 1975 in the mountain of Laozuo that construct the development mining of the diggings on 1989.Since from now is more than 20 years,the Laozuo mountain is on the dangerous circumstance of the shortage of resources. According to the long-time survey about the project of Laozuo mountain so as to get a further studying work on prospecting and mineral deposit exploration for used mine. The research is mainly introduce the metallogenic environment and the regulation of the mineral. And based on the technology we have mastered, we can apply it into practical production.
Project Portfolio Optimization Study of Project-Oriented New Energy Power Enterprise Engineering Analysis
Authors: Wu Yun Na , Gao Min , Li Xin Yun
Published: March 2013

With the rapid development of new energy technologies, a number of project-oriented new energy generation companies emerged. However, these enterprises are faced with various issues that triggered by the simultaneous management of multiple projects. This paper analyzed the development of project-oriented new energy generation companies and then studied the method of optimized order based on project portfolio strategies. As to project optimization, this paper proposes SWOT analysis and the key criteria weighted scoring method, and it proves the availability of the method with instance. This method improves the efficiency of project management in new energy generation companies.
Control of the Tender Stage for the Quality of Engineering Materials
Authors: Yin Li Jun
Published: March 2013

In this paper, it analyses the current construction project bidding stage tender documents, introduces the status quo of China's building materials market. Building materials in the construction work is proposed in the tender stage through the tender documents rigorous formulation of certain measures, effective control of the quality of engineering materials, in order to achieve the purpose of the quality of the project from the source control.
Flash Type Fabric Lit Modern Fashion Design with Active Materials
Authors: Tian Mei Ling
Published: March 2013

Based on modern advanced fashion design widely used flash type fabrics is discussed.Based on specific flash type fabric definition, describes its multidimensional nature, from back in fashion in the development history of flash type fabric to rise and growth processes of change, and high fashion and design masters of the intimate relationship between a comprehensive exposition of.The article with a lot of examples to prove the flash type fabric in high fashion in the use of the CMO, affirming its broad development road.Novel flash type fabric with design of constant development, comply with tide, with long-lasting charm, to illuminate the future world.
Optimization Design of Cylinder Grating Used for Non-Contact Speed Measurement
Authors: Zhang Guo Sheng , Xu Yan
Published: March 2013

In order to realize the detection of diffractive light after the image segmentation using cylinder grating, the parameters of a cylinder grating was optimized using the wave optics theory. By analyzing the relation of optical path length variation with the diffraction angle of single cylinder lens diffraction, and by Fraunhofer approximation, the analytical expressions of cylinder lens diffraction was given. By setting parameters to calculate and simulate, it was found that to increase the ratio of curvature radius and grating period could effectively reduce the spatial distribution of the diffraction light intensity. For the gratings that already exist, by reducing the ratio of refractive index of the gratings material and environment, the spatial light distribution of the grating could be reduced. If the cylinder grating period is too small, the overlap part of images segmentation light diffraction intensity will increase. But it occupies smaller proportion of the total light intensity. After the optimization design of cylinder grating, the results showed that it could be used for non-contact speed measurement in the range of some parameter.
Research on Derivative Products Design of Pottery and Cartoon
Authors: Fang Man , Zhou Fang
Published: March 2013

The animation gradually started to become a sunrise industry, the combination of ceramics and animation is a fusion of classical culture and modern culture try. Market situation determines the potters to move closer to the animation industry, the derivative products of animation ceramic is inevitable. Positioning in the market, combined with the feasibility of the above we have done some relevant analysis, drawing that the animation ceramics market prospect is broad, and have identified several possible design directions.
Cost Optimization of External Cylindrical Grinding
Authors: Pi Vu Ngoc , The Phan Quang , Khiem Vu Hong , Huong Nguyen Ngoc
Published: March 2013

This paper introduces a study on cost optimization of external cylindrical grinding. The effects of many grinding process parameters such as the initial grinding wheel diameter, the wheel life, the total dressing depth as well as the effect of cost components including the machine cost, the labor including overhead cost, the grinding wheel cost and so forth were taken into account. A model for calculation the optimum exchanged grinding wheel diameter was proposed. With this optimum diameter, a new and effective way of using the grinding wheel was proposed and both the grinding cost and grinding time can be reduced considerably.
The Rheological Behavior of Polyamide-66/Liquid Crystal Polymer Blends
Authors: Li You Bing , Pan Yan , Sun Zhen Zhen , Sheng Xu Min , Shi Wen , Li Jing Yuan , Huang Hong
Published: March 2013

The rheological behavior of polyamide-66 (PA66)/liquid crystal polymer (LCP) blends and the effect of liquid crystal polymer on melt flow rate were studied. A torque rheometer was used to investigate the rheological behavior of the PA66/LCP blends, and the effects of mass fraction of LCP, compatibilizer (PS-g-MAH), blending temperature and rotor speed on the rheological behavior of the blends were analyzed by an orthogonal experiment method. The results showed the above factors’ effects on the equilibrium torque of the blends were different individually, and the rheological behavior of the blend strongly depended on the LCP content. The melt flow rate was enhanced by a small content of LCP, and decreased with increasing LCP content.
The Finite Element Analysis of a Shipyard's Lifting Eye with Load
Authors: Lin Shao Fen , Zhu Zhao Yi
Published: March 2013

As lifting points for ship block turning over and hoisting operation, the strength of the lifting eye directly affects the safety of the operation, therefore it is required for extreme high reliability. The conventional strength analysis can not exactly describe the actual stress and working conditions of the lifting eye, nonlinear contact and simplified finite element arithmetic are used for analyzing and checking the lifting eye's strength in this paper; and the stress force distribution formula, which can well reflect the true status of the pressure-bearing surface, is researched. Through the comparison of the various calculation methods, it can be found that the reasonable simplified method can approach the nonlinear contact finite element arithmetic with high precision and is characterized with higher calculation speed and more concise and practicable.
Numerical Study on Process of Drag Reduction by Laser Plasma in Supersonic Vehicle
Authors: Li Qian , Liu Zhun , Hong Yan Ji , Wang Dian Kai
Published: March 2013

Interaction between laser plasma and bow shock wave in front of supersonic vehicle is analysized. Physical and mechanical model of laser plasma energy being deposited in supersonic fluid field is established and computational code is programmed. Process of drag reduction by laser plasma in supersonic vehicle is simulated numerically, and the mechanism of laser plasma reducing drag is disclosed. Simulated results are compared with relative references’, which agree well with each other. It is illuminated that drag reduction by laser plasma can be studied by the established model and code.
Research on the Theory and Experiment of Coupled Vibration for CODAD Marine Propulsion Shafting Systems
Authors: Xu Xiang , Zhou Rui Ping , Jiang Jian Hua
Published: March 2013

CODAD (Combined Diesel and Diesel) has been widely used in marine propulsion shafting, but there were few researches about the device for shaft coupling vibration. In this paper, based on the independent design multi-functional test bench of the marine power plant, the coupling vibration calculation method of the test bench was established for the gearbox output helical gear through the theory analysis. Then the calculation method was proved feasibility by compared the torsional vibration measured data and two methods of calculating results.
The Simulation Research of In-Plane Static Compression Properties of Honeycomb Paperboard Based on FEA
Authors: Ma Yong Sheng , Sun Cheng , Mu Xin Ni , Li Xin
Published: March 2013

The in-plane mechanical properties of honeycomb paperboard were analyzed and simulated by ANSYS software with finite element analysis method. This paper also explored and optimized finite element modeling method of honeycomb paperboard structure and obtained the equivalent stress distribution maps of honeycomb paperboard in different displacement loads. The mechanical properties and deformation mode of the honeycomb paperboard in the in-plane compression conditions were also analyzed. The results show that longitudinal compressive strength is greater than the lateral compressive strength. The compression deformation mode is different when compressing but appears with the same four stages. The results of finite element analysis have good equivalence with the experimental ones. This paper also revealed the honeycomb paperboard in-plane mechanical properties, deformation and destruction mechanism, further extended the research scope of honeycomb paperboard, and promoted the application of finite element method in the analysis of honeycomb paperboard.
Finite-Element Analysis of Arranging Intermediate Cuttings Tool of Circular Saw Web and Wedge Disc
Authors: Wu Yan , Ma Yan
Published: March 2013

When the intermediate cuttings cut the wood, the efficiency of the vibration of the circular saw web was low so that the saw web always broke off. Moreover, the high-speed rotation would cause the vibration of the complete machine and result in the initial failure of the machine. Therefore, seeing from the problems from the analysis above and practice, the new design of the current micro intermediate cuttings seemed especially important. In the thesis, the author made a new arrangement of the micro intermediate cuttings of machinery tools, carrying out three-dimensional modeling and simulation of the complete machine and made an analysis of the dynamic cutting process by means of analyzing the working condition of circular saw web.
The Calculation of Initial Inspection Interval of Condition-Based Maintenance for Special Equipments
Authors: Xin Zhao , Qiang Yang , Sun Zhi Li , Ji Bian , Lei Zhang
Published: March 2013

Lacking of failure samples, the estimation of MTBF of special equipments is imprecise. Half of the MTBF is regarded as inspection period in classical condition-based maintenance analysis. Because of ignoring reliability life changing of the product, maintenance with fixed period usually leads to more or less of inspection and replacement. According to factory and laboratory failure data, reliability estimation modal of small samples is built for crane based on Bayes theorem, and reliability forecast of the girder of crane is realized. Further more; for special equipments with potential failure mode, first inspection period model of condition-based maintenance analysis based on RCM is set up, on the basis of maintenance cost and availability strategy, the calculation methods of optimal inspection periods are given. This research provides a reference for safety evaluation and inspection strategy establishing for condition-based maintenance of mechanical-electrical special equipments which lack failure data of factory and laboratory.
Application of Taguchi Method for the Optimum Design of a 3MW Permanent Magnet Synchronous Generator
Authors: Tsai Wen Chang
Published: March 2013

The paper is examined to establish the optimal set of control parameters for the design of a 3MW direct-drive permanent magnet synchronous generator by applying the Taguchi method. Taguchi orthogonal array is employed to determine the optimal combination of design parameters, including: steel lamination material, applied voltage, slot number, diameter of air-gap, magnet pole materials, magnet pole depth, stator outer/inner diameter, and length of stator core under the rated rotating speeds of the generator. Next, core loss database of used electrical steel laminations in generator was investigated. Effect of these control parameters of the permanent-magnet synchronous generator on the output power and efficiency are also analyzed in the paper. Results show that the designed 3MW direct-drive permanent magnet synchronous generator is capable of operating stably and assure the adequate 3MW power output and good efficiency greater than 95%.
A Novel Generator Side Converter Control Scheme of Direct Driven PMSG Wind Turbine
Authors: Shun Yang , Zhang Li Da
Published: March 2013

With the advance of electronic technology,the filed-oriented control of voltage space vector PWM have become more efficient in generator side converter control.This paper presented the direct driven wind turbine model and the permanent magnet synchronous generator (PMSG) model in synchronous rotating d-q reference frame.Using filed-oriented control of voltage space vector PWM in generator side converter control for enhance efficiency. The optimal control strategy can keep wind turbine working at optimal tip speed ratio for capture maximum wind power.A novel nonlinear PI controller for anti-windup implemented in control loop for highest efficiency of wind turbine which can be reached.Simulation results verified and shown via Matlab/Simulink that the performance of nonlinear PI controller for anti-windup in generator side converter control system is better than traditional PI controller in control loop for wind turbines.
High-Reflectance Coatings at 193nm
Authors: Sun Jian , Zhang Wei Li , Yi Kui , Shao Jian Da
Published: March 2013

As an important component in 193nm laser system, high-reflectance (HR) coatings with excellent optical and mechanical properties are needed urgently. In this study, we designed and produced three different HR coatings at 193nm, Al2O3/ AlF3 coating, LaF3/ AlF3 coating and a double stack mirror with combination of Al2O3/ AlF3 and LaF3/ AlF3. With 14 layer pairs, the reflectance of Al2O3/ AlF3 coating could reach 98% which could not get higher duo to the absorption of Al2O3. The reflectance of LaF3/ AlF3 coatings could achieve 98.13% with 15 layer pairs. When the layer pair increased to 16, the reflectance lessened ascribed to steep rise in scattering loss caused by micro-cracks occurred in the coatings. A mirror with combination of Al2O3/ AlF3 and LaF3/ AlF3 could obtain the reflectance of 98.78% as deposited. Even 4 months later the value could still reach 98.47% which was an excellent candidate for practical application.
Research on Tyred Machinery Chassis Dynamometer
Authors: Zhao Wei , Wang Qiang , Song Sheng Li
Published: March 2013

In the tyred machinery chassis dynamometer control system, a fuzzy PID controller was used to adjust the exciting current of a DC dynamometer in order to change the resistance load torque, so the requirement of roller load for simulating the run resistance from the road surface was satisfied. A fuzzy PID arithmetic was designed to control the resistance loads, the system performance was improved by simulation. The software of the detection line measure-control system was designed in VB, the technical parameters of the machinery chassis could the automatically detected.
Experimental Study of the Turning Elements Effect on the Power Spectrum Density of Turning Vibration of Cutting Tool
Authors: Zhuo Shi Chuang , Zhang Qiang , Li Shun Cai
Published: March 2013

By means of the QLVC-ZSA1 vibration signals analyzer and an acceleration sensor, three experimental schemes, (1) different spindle speed and (2) different feed rate for the first half and the second half of the same feed length, and (3) three successive feeds under the same turning parameters, were designed to study quantitatively the vibration responses of the cutting tool in the turning process by the numerically controlled lathe. The study indicated that (1) with the increase in the spindle speed and feed rate, the maximum self-power spectral density of the tool vibration also increased, while the corresponding vibration frequency decreased; (2) with the increase of the material removal during the turning, the maximum self-power spectral density of the tool vibration displayed a increasing trend and its average value varies from 5.0 to 9.0 , and the frequency of the maximum tool vibration energy concentrated at the about 3750Hz.
Structure Design and Dynamic Study on the Large-Displacement Motion Simulator
Authors: Zhou Yue Fa , Zhou Lv , Zhou Wen Bo , Han Guang Cai , Zhang Zhi Yong
Published: March 2013

The large-displacement motion simulator which composed by Cartesian coordinate movement Desk and Three-axis turntable was designed in this paper. This Motion simulator can move the working spaces to any position of the space by any posture, which solved the disadvantages of the STEWART platform, the smaller spatial displacement and limited space corner. Kinematic analysis of the large-displacement motion simulator was discussed in this article, and theoretical modeling of the large-displacement motion simulator was presented by KANE equations. This has the theoretical significance for the research of the technology of space motion simulation and docking.
Effect of Oxygen Incorporation on the Properties of AlF3 Films
Authors: Li Xu , Sun Jian , Zhang Wei Li , Hou Yong Qiang , He Kai , Yi Kui
Published: March 2013

In order to reveal the influence of oxidization on the properties of AlF3films, single layers of AlF3were deposited at different substrate temperature by thermo evaporation technique with or without oxygen injected into the coating chamber. The chemical composition, total stress, optical properties and laser damage resistance of samples were characterized. Comparative study indicates the AlF3films prepared under higher oxygen pressure have more oxides which result from hydration process in atmosphere. The presence of oxides also reduces total stress and optical absorption of the fluoride coatings.
The Design of Data Acquisition Signal Generator Based on LabVIEW
Authors: Ju Wang , Peng Yun Lian , Rui Ding
Published: March 2013

In this paper, we proposed a set of data acquisition signal generator based on LabVIEW development tools, and realized the data communication from data collection terminal to testing the PC that based on serial port. Completed the function which of including data acquisition, signal generating and verified by simulation. The different between traditional generator and the Labview designed generator is to banish tedious and bulkiness of the traditional generator. With its unrivaled hardware integration and other unparalleled features, LabVIEW is an industry-leading software platform.
A New Computational Inverse Method and Application to the Identification of Dynamic Loads
Authors: Wang Lin Jun , Xie You Xiang , Wu Hai Hua
Published: March 2013

In this paper, we propose a new computational inverse method for solving the identification of multi-source dynamic loads acting on a simply supported plate. Using a priori choosing appropriate regularization parameter, the present method can obtain higher optimum asymptotic order of the regularized solution than ordinary Tikhonov regularization method. In the numerical simulations, the identification problem of multi-source dynamic loads on a surface of simply supported plate is successfully solved by the present method. Meanwhile, most of its performances are better than ordinary Tikhonov regularization method.
Human Action Recognition Algorithm Based on Key Posture
Authors: Yuan He Jin
Published: March 2013

A novel human action recognition algorithm based on key posture is proposed in this paper. In the method, the mesh features of each image in human action sequences are firstly calculated; then the key postures of the human mesh features are generated through k-medoids clustering algorithm; and the motion sequences are thus represented as vectors of key postures. The component of the vector is the occurrence number of the corresponding posture included in the action. For human action recognition, the observed action is firstly changed into key posture vector; then the correlevant coefficients to the training samples are calculated and the action which best matches the observed sequence is chosen as the final category. The experiments on Weizmann dataset demonstrate that our method is effective for human action recognition. The average recognition accuracy can exceed 90%.
A New Approach of Computer Forensics Based on Steganalysis
Authors: Zhong Xiu Yu , Zeng Feng
Published: March 2013

Criminals often destructed or hided evidence after making crime by computer, they hindered computer forensics by anti-forensics technology. A new approach of computer forensics based on steganalysis is proposed. The common anti-forensics technologies, such as steganography, data encryption delete evidence and make forensics invalid. In order to enhance the evidence efficiency, steganalysis is applied in the computer forensics to collect and transfer evidence. Simulation results show that steganography based on least significant bit (LSB) by java program embeds the text files into the BMP image files, which sizes are nearly invariable. Steganalysis restores the hidden information and provides convenient method for computer forensics.
Research about Information Security Risk Assessment of Oil and Gas Production Management System
Authors: Sun Jun Jun , Zhang Bei , Feng Mei , Chen Liang , Hou Mei Feng
Published: March 2013

Current information security risk assessment models usually focus on the security problems of information system and its environment, however they ignore data changes and the accompanying risks in the whole production process. Aiming at the problems above, the paper analyzes the risks of oil and gas production management system during the different stages of data generation, transmission, processing, storage and demonstration, then proposes a set of data risk assessment model and method focusing on data security. The data risk assessment model provides a new way to prevent intrusion, protect data and safeguard information system’s integrity, availability and security.
Fast Algorithms for Computing Composite-Number-Less-Than-20-Point DFT
Authors: Li Hai Jun , Han Wei , Shang Hua , Ji Pei Rong
Published: March 2013

In this paper, fast algorithms for computing composite-number-less-than-20-point DFT is developed, it is based on the matrix operation, makes as much use of the characteristics of twiddle factor, repeatedly transforms the twiddle factor matrix, finally, the core matrixs for computing N-point DFT is obtained. This paper provides the core matrix, calculation process and the amount of computation of less-than-20-point DFT. The algorithm is easy to be understood and applied.
Stability and Unstability of Chaos in Stretch-Twist-Fold Flow (STF)
Authors: Shahab Ud Din Khan , Shu Yong Lu , Salah Ud Din Khan
Published: March 2013

In this study, the Adomian's decomposition method (ADM) is applied to the STF system. This method has been tested on the STF system which is a three-dimensional system of ODE with quadratic nonlinearities. A computer based Matlab program has been developed in order to solve the STF system. Chaotic and non-chaotic behavior of the system has been analyzed graphically and finally a comparison as well as accuracy between two systems has been made in two-step sizes with detail.
Negative Electron Affinity AlGaAs/GaAs Photocathodes with Exponential-Doping Structure
Authors: Zhang Yi Jun , Zhao Jing , Zou Ji Jun , Niu Jun , Chang Ben Kang
Published: March 2013

Obtaining photocathodes with high quantum yield has been the focus during the process of photocathode development. With the limitation of basic industrial manufacturing level, the further performance improvement of the negative electron affinity photocathode is subject to the quality of grown material itself. For this reason, according to the band engineering science, we have proposed an exponential-doping structure applied to the active-layer of reflection-mode and transmission-mode AlGaAs/GaAs photocathodes via molecular beam epitaxy technique, to increase the photocathode emission efficiency. A series of theoretical and experimental researches including structure design, material growth, surface cleanness, Cs-O activation and performance evaluation have been carried out to confirm the actual effect of exponential-doping photocathodes. As a result of the built-in electric field, the cathode performance was enhanced for exponential-doping AlGaAs/GaAs photocathodes.
Radiation Damage Effects in Si Materials and Detectors
Authors: Li Zheng
Published: March 2013

Silicon sensors, widely used in high energy and nuclear physics experiments, suffer severe radiation damage that leads to degradations in sensor performance. These degradations include significant increases in leakage current, bulk resistivity, space charge concentration, and free carrier trapping. For LHC (Large Hadron Collider) applications, where the total fluence is in the order of 1x1015neq/cm2for 10 years, the increase in space charge concentration has been the main problem since it can significantly increase the sensor full depletion voltage, causing either breakdown if operated at high biases or charge collection loss if operated at lower biases than full depletion. For LHC Upgrade, or the sLHC, however, with an increased total fluence up to 1x1016neq/cm2, the main limiting factor for Si detector operation is the severe trapping of free carriers by radiation-induced defect levels.
Research of Nanometer TiO2/PF Composites and the Properties of Semi-Metallic Friction Material
Authors: Nie Hua Wei , Zhou Yuan Kang , Cao Yang , Li Guo Qing
Published: March 2013

A type of phenolic resin (PF) was prepared by using TiO2 nanoparticles modified with KH-550 as composite filler and modifier, and then the composite modified PF were used as adhesive to prepare semi-metallic friction materials samples. TG analysis of the prepared nano-TiO2 /PF composites was conducted on SETARAM-TG2DSC92216 thermal analyzer that was made in France, and the friction and wear property comparison tests of the samples were carried out on XD-MSM fixed speed friction-wear machine. The results show that the heat resistance of phenolic resin after being compositely modified by TiO2 nanoparticles can be improved, carbon residue rate increases10% at 600°C；the friction coefficient of the corresponding sample slightly increases；the wear rate clearly decreases at high temperature, and wear rate decreases 10% at 350°C.
Microstructure and Mechanical Performance of Diffusion Bonding Joints of 316L Ss with Ni Interlayer
Authors: An Zi Liang , Xuan Fu Zhen , Tu Shan Tung
Published: March 2013

The diffusion bonding of 316L stainless steel with Ni interlayer in the temperature range of 850-1050°C, under a uniaxial pressure 10 MPa for 60 min is investigated. The diffusion bonds have been evaluated light microscopy, SEM, X-ray diffraction and tensile test. The main result is that the introduction of the interlayer may reduce the room temperature strength but increase the high temperature strength. This is attributed to the transformation of Fe0.64Ni0.36 formed in bonding process into FeNi3 at high temperature. Kirkendall voids are formed in the Ni interlayer near the interface where the specimen fractured. Fractographic study indicates that the fracture mode of the joints is strongly affected by the bonding and testing temperature. The fracture is a mixed mode of brittle and ductile fracture in high temperature tensile test, while it is brittle fracture at room temperature.
Preparation and Property of Hydrophobic Modified Guar Gum Thickener
Authors: Su Ying , Shen Yi Ding , Lai Xiao Juan , Wang Xiao Rong
Published: March 2013

The modified guar gum was synthesized with guar gum as material and bromododecane as etherifying agent by suspension polymerization method. The solution and gel of the modified guar gum were also prepared. The structure and the property of the modified guar gum were analysized by Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The heat resistance and the viscoelasticity modulus of the gel were also researched by rheometer. The results of FT-IR and XRD show that the hydrophobic long chain has been introduced into the guar gum successfully. TGA indicates that the modified guar gum has higher thermal stability. The rheology tests reflect that with different temperature conditions, the shear viscosity, the viscoelasticity modulus of the gel and the heat resistance of the modified guar gum are both better than that of the unmodified guar gum. The modified guar gum can be used as thickener of fracturing fluid, and it can reduce its amount.
Design of Lightweight Hybrid Materials for the Cab Body-In-White of a Commercial Vehicle Based on Multi-Objective Optimization
Authors: Cui An , Xu Li Juan , Zhang Xian Bo , Yang Qiang
Published: March 2013

In this paper, the lightweight hybrid materials cab BIW of a commercial vehicle is investigated for material selection. In order to improve the dynamic performance and reduce total mass, the lightweight materials are employed in the BIW. Nine groups of sensitive components are selected to apply the lightweight materials. The design problem is formulated as a multi-objective nonlinear programming problem and the modified non-dominated sorting genetic algorithm (NSGA-II) is used to solve the problem. The surrogate model based on radial basis function (RBF) is adopted in the optimization. The research results show that the usage of steel-aluminum hybrid materials can reduce the total mass and increase the first torsion modal frequency of the cab BIW.
Performance Analysis of the Regenerative Brayton Refrigeration Cycle Using Gd0.94Er0.06 as the Working Substance
Authors: Yuan Wang , Diguet Gildas , Lin Guo Xing , Chen Jin Can
Published: March 2013

Based on the experimental data of entropy change varying with temperature, the regenerative Brayton refrigeration cycle using Gd0.94Er0.06 as the working substance is set up for magnetic field changes with 0-1T and 0-2T. By using thermodynamic analysis method, some parameters such as the non-perfect regeneration, net cooling quantity, coefficient of performance (COP), and so on, are analyzed and calculated. The effects of temperature of the heat reservoir, regeneration and external magnetic field are also discussed. The results obtained in the present paper show that the refrigeration cycle operating in TC=T0, TH= T0+7K and 0-2T magnetic field change has not only maximum cooling quantity but also maximum COP in all the established magnetic refrigeration cycles, and can provide some new guide for the optimal design of real room-temperature magnetic refrigerators.
Effects of Mg and Si in Al Matrix on Dimensional Stability of SiCp/Al Composites during Temperature Change
Authors: Zou Ai Hua , Zhou Xian Liang , Li Duo Sheng , Hua Xiao Zhen
Published: March 2013

In this paper, based on the parameters of cumulative residual strain(CRS), the effects of different contents of Mg and Si elements in Al matrix on the dimensional stability of SiCp/Al composites was investigated and analyzed in the temperature interval of 25～400°C. Results show that，with the increasing of Si content in Al matrix, the CRS fluctuates only in a small range of strain, adding Si in Al matrix is beneficial to the dimensional stability of the composites, which can be improved through pre-thermal cycling; with the increasing of Mg content in Al matrix, the absolute value of negative CRS of the composites becomes smaller at the beginning and then turns positive, adding Mg in Al matrix causes the composites expand after several thermal cycling, it is not good to the dimensional stability of the composites and is quite impossible to be improved by pre-thermal cycling. Besides, the CRS in thermal cycling is mainly caused by the plastic relaxation, which results in the irreversible dimensional variation of about 10-5~10-4.
The Parameters Identification Method of Radiation Heat Transfer for Nanoporous Materials
Authors: Yu Ji Jun , Huang Fei , Jiang Gui Qing
Published: March 2013

The two flux approximation model is usually used to calculate the heat transfer of radiation for porous materials. In this paper, the parameters identification method of the extinction coefficient and the albedo of scattering in the two flux model is set up by using the identification theory according to the data of the back temperature. The simulated process shows that the convergence rate is fast and the results by the parameters identification are very close to the origin values.
The Study on Ultrafine Explosives’ Sensitivity
Authors: Xiong Yan Fei , Yu Jiang , Xia Chang Fu , Gao Yan Feng
Published: March 2013

With high pressure spraying refinement technology of explosive, we obtain ultrafine powder of TATB and HMX. The middle diameter of them is 746 and 242 , that is to say those two kinds explosives belong to ultrafine explosive. Impact test indicate that the impact sensitivity of ultrafine TATB and HMX is decreasing in some degree. However the shock sensitivity is increased and the increased range is big. The end, we analyze this phenomenon and explain the reason that the ultrafine explosives` sensitivity is different form usual explosive in theory.
Preparation for Spherical Humidity Control Composite Materials and their Humidity Control Properties
Authors: Xu Peng Fei , Hu Zhi Wen , Peng Zhi Qin , Huang Dun , Yu Ning , Yao Qing Qing
Published: March 2013

A spherical humidity control composite material with excellent humidity control performances has been prepared by twice foaming method. The composite comprises a natural polymer derivative (KGM), a porous natural mineral (Halloysite) and an Sodium polyacrylate (PAAS). It has high capacity for moisture adsorption, fast response to humidity changes, and small range for equilibrium humidity control. The moisture adsorption content of the composite material is 1.10 (g/g) of its own weight. The moisture absorption rate is 0.3948 (g/7h•g-1), and moisture desorption rate is 0.4682 (g/7h•g-1). The composite material has an equilibrium humidity control ranging from 50%RH to 53%RH. It can reach to the equilibrium levels within 60 minutes. It is suitable for maintaining a proper micro-environment for places such as museums or galleries.
On the Practice of the Microstructure Adjustment to Improve the Strength-Plastic Comprehensive Performance of a C-Si-Mn Alloyed High-Strength Steel
Authors: Kuang Shuang , Zhu Guo Sen , Jiang Ying Hua
Published: March 2013

Four continuous annealing cycles were adopted to get four kinds of multi-phase steels using 0.2C-1.5Si-1.8Mn [wt%] alloyed raw steel and the microstructures and mechanical properties were investigated. The results show that traditional ferrite-martensite dual phase steel has a tensile strength of more than 1000MPa, but has the lowest strength-plastic product of only 18GPa%. The traditional ferrite, bainite and residual austenite TRIP steel has the highest elongation of 31% and hardening exponent of 0.24, but its tensile strength is just over 800MPa. Introducing hard matrix such as acicular bainitc ferrite or martensite to replace the polygonal ferrite matrix, meanwhile introducing metastable austenite, is conducive to obtain high strength and good ductility. Those kinds of modified TRIP steel with hard matrix can reach above 20GPa% of the strength-plastic product on the 1000MPa grade.
A Study on the Carbon Nitriding Process of BF Slag Containing Titanium
Authors: Li Liang , Wang Jun , Fan Xing Ping
Published: March 2013

The experiment was done in which the BF slag containing titanium produced by Pangang with vanadium-titanium magnetite was dealt with carbon and nitrogen. The possibility of the carbon nitriding reactions were analyzed theoretically. It is found by thermodynamic calculation that the carbon nitriding of TiO2 is easier than that of other oxides and the temperature of carbon nitriding of perovskite can be reduced with the presence of Al2O3 and SiO2 in slag. The phase composition and microstructure of production from carbon nitriding were studied using X-ray diffraction and SEM. It is approved that the main phase composition of production from carbon nitriding under N2 was Ti(C,N). The influence factors, temperature, holding time and particle size were investigated. The results show, the phase compositions of the slag is mainly perovskite; the most suitable temperature and holding time of carbon nitriding is about 1450°C; the most appropriate holding time was about 2 hours and the most suitable size of the slag particle is about 180 meshes. With the optimization of the process, the size of Ti(C,N) can be increased which will benefit the recycle of Ti(C,N) in ore dressing.
Research on Plasma Arc Melting-Pressure Welding Method for Nitinol Alloy Wire
Authors: Xu Yue Lan , Hu Xiao Yong , Zhang Jun
Published: March 2013

According to the problem of the joint performance degradation in melting nitinol alloy wire connection, the method of melting-pressure connection applying plasma arc welding as melting heat source was designed and the special flexible fixture was invented to realize the welding process. the Φ2mm nitinol alloy wire connected by this method is shaped well . The characteristic of the welded joint microcosmic formation shows that the grains appear rheological pattern in heat-affected zone. The tensile strength of the joint by plasma arc melting-pressure welding after annealing is 89% of the base metal, it also increases by 43% comparing with the plasma fusion welding joint. The shape memory of the joint is about 97.1% of the base metal, which is higher than the fusion weld joints by 3.3% .
Origins of the Process-Parameter Effects in Fabricating Polymer Micromixers Using Microinjection Molding
Authors: Ying Jun Jie , Yang Can , Yin Xiao Hong , Guan Wei Sheng
Published: March 2013

Based on our previous work, the present work intends to reveal the origin of the process-parameter effects in fabricating polymer micromixers using microinjection molding. First of all, the effects of the process variables including the melt temperature, injection velocity, packing pressure and packing time, on replication quality of the micromixers were numerically investigated using Moldex3D software. The simulation results were found to agree well with the reported experimental ones, that’s, among the investigated variables, the melt temperature was the only significant factor influencing the replication quality of the micromixers. Moreover, the rheology behavior and the cooling behavior of the PMMA melt were analyzed and identified as the origins of the process-parameter effects.
Material Removal and Application by Chemical Impact Reaction in Nano-Abrasive Jet Polishing
Authors: Peng Wen Qiang , Li Sheng Yi , Guan Chao Liang , Shen Xin Min
Published: March 2013

Material removed by mechanical process inevitably causes surface or subsurface damage containing cracks, plastic scratch, residual stress or dislocations. In nano-abrasive jet polishing (NAJP) the material is removed by chemical impact reaction. The chemical impact reaction is validated by contrast experiment with traditional lap polishing process in which the material is mainly removed through mechanical process. Experiment results show the dependence of the abrasive particles on the choice of materials. Even if the abrasive particle and the workpiece are composed of similar components, the machining properties are remarkably different due to slight differences in their physical properties or crystallography etc. Plastic scratches on the sample which was polished by the traditional mechanical process are completely removed by NAJP process, and the surface root-square-mean roughness has decreased from 1.403nm to 0.611nm. The NAJP process will become a promising method for ultra precision machining method for ultrasmooth optical surface.
Synthesis and Characterization of Quaternary Ammonium Polyether Blocked Polysiloxane
Authors: An Qiu Feng , Xiao Bo , Xv Xia Meng , Hao Li Fen
Published: March 2013

In this research, a new quaternary ammonium polyether blocked polysiloxane (QBPEAS) was synthesized by reaction of epoxy polyether terminated polydimethylsiloxane with tetramethylethylenediamine. The chemical structure of QBPEAS was characterized by IR and 1H-NMR. And then the film morphology on fiber substrates was investigated by scanning electron microscope (SEM). The results showed that QBPEAS has a good film-forming ability and can form a macro-smooth Sloane film on the treated fiber surface. In addition, QBPEAS could obviously decrease the bending rigidity and improve the hydrophilicity of the treated fabrics, but has little influence on the fabric whiteness.
Study on the Preparation Method of Nanoparticle Reinforced Copper Alloy and Mechanical Test
Authors: Wu Lan Ying , Chen Jian Meng
Published: March 2013

In this paper,on the basis of a certain kind of Tin bronze alloy,a new nanoparticle reinforced copper alloy with additions of some alloy is produced by using vacuum melting and centrifugal casting technology.The mechanical properties of the alloy have increased significantly than the Tin bronze alloy.The tensile strength, yield strength,elongation of as-cast nanoparticle reinforced copper alloy are 477~535MPa,221~280MPa,28.0~35.6%,respectively.Compared with the conventional Tin bronze alloy, the strength and plastic of the nanoparticle reinforced copper alloy are obviously improved.
Synthesis and Characterization of PBA/aPS Core-Shell Latex Particles
Authors: Li Ming Jue , Diao Ying Yan , Liu Xi Jun
Published: March 2013

The core-shell structure copolymer of PBA/PS was prepared using pre-emulsion and semi-continues polymerization process. The particle size of core-shell latex and the St conversion of shell monomer were affected by emulsifier, initiator, pH and temperature etc. Meanwhile, the laser particle size analyzer, transmission electron microscope and other test methods were utilized to study latex particle average particle size, size distribution and morphological structure, respectively. The kinetics of polymerization was investigated. Well-defined core-shell structure and narrow particle sizedistribution could be achieved under starved conditions of monomer feeding. By the means of TEM found that PBA/PS latex particles had clearly core/shell morphology.
Experiments and Numerical Simulations on Laser Welding Deformation of Thin Plate Considering Constraint Clamp
Authors: Zeng Pan , Lei Li Ping , Mei Le
Published: March 2013

As to laser welding process of thin plate, the configuration style of welding deformation under constraint condition is investigated by designing two cases: (1) the free bead welding, (2) the bead welding with a constraint clamp. Both experiment and simulation for these two cases are carried out to study the corresponding phenomena of welding deformation. In numerical simulation, an equivalent method, i.e., the Local Equivalent Welding Element (LEWE), is used to predict the residual deformation of welding plate, which possesses higher efficiency and accuracy. Research results show that the constraint condition will remarkably affect the residual deformation behavior of welded plate.
Effects of Rolling Process on Microstructure and Yield Ratio in a High Strength Building Steel Plate
Authors: Xiong Tao , Yu Hong Wei , Wang Shi Sen , Dong Han Xiong , Li De Fa
Published: March 2013

The microstructures have been investigated in steel plates with different rolling processes to find the reasons of yield ratio overseted standard in few high strength building steel plates produced in Echeng Iron and Steel Corporation. The effects of rolling path, rolling path depress ratio on microstructure and properties. Some reasons of yield ratio overseted standard have been analyzed. The results show that decreasing rolling paths and increasing depress ratio refined grains but unchanged area ratio and interlamellar spacing of pearlite. Yield strength excessively increased but tensile strength unchanged increased yield ratio. So, excellent properties can be obtained by applying the optimization process.
A Study on Grinding Parameter Optimization of Reaction Bonded Silicon Carbide
Authors: Wang Yao , Feng Zha Yan
Published: March 2013

In order to enhance the efficiency and the surface smooth degree of the RBSiC grinding, a three factors two levels full factorial design was utilized to optimize the process. Combined with the effects of grinding parameters on surface roughness, the grit cut depth analysis was employed to choose the appropriate grinding parameters. The strength reliability and the residual stresses of the RBSiC ground using the optimized parameters were investigated. The results show that comparing to the polished RBSiC the ground ones have higher compressive residual stress, lower crack scatter and similar average bending strength.