bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of a Kind of Combined Antenna with Wide Band for Passive Radar Application
Authors: Song Li Zhong , Li Xi , Cao Bing Xia
Published: June 2013

The wide band antenna is a key technique for the passive radar. This paper proposed a new kind of wide band antenna combined with the Archimedean spiral and hemispherical helix for passive radar application. For the new antenna, the planar Archimedean spiral is mounted on the top of the hemispherical helix, and it is fed at the center of the Archimedean spiral. An antenna with specific structure and parameters was designed and simulated to obtain its radiation performances over the operating frequency range from 2GHz to 10GHz. For entire operating frequency range, the simulated gain is greater than 5 dBi and the voltage standing wave ratio (VSWR) is less than 2 when the characteristic impedance of transmission line at the terminal is 240Ω. Wide beam and approximately circular polarization characteristics are also observed. The simulation results demonstrate that the new kind of antenna has wide band radiation performances, which can be used in passive radars. Furthermore, the proposed antenna has simple structure and low cost, so it is suitable for mass fabrication.
Process Practice of Refining for Free Cutting Austenite Stainless Steel
Authors: Wang Yi Min , Wang Xian Cai , Wen Li Min
Published: June 2013

FreeCutting Austenite Stainless Steel 303CuS2(%:≤0.08C,8.00~10.00Ni, 17.00~19.00Cr, 1.50~3.50Cu,0.24~0.35S) is smelted by 60t Electric Arc Furnace~60t Argon Oxygen Decarburization~60t Ladle Furnace~3 Flow continuous casting machine. With decreasing basicity of AOD refining slag from 2.0 to 1.6, controlling AOD tapping slag amount and tapping temperature, the [S] in AOD tapping steel increases to 0.008%~0.012% from original 0.004%~0.006%, after feeding S-wire containing 50% S and controlling the end temperature, the yield of S increases to 60%~70% from original 30%~50%, the qualified ratio of raises from 85% to 100%.
Modeling and Simulation of a Small-Scale Mining Road Headers Constant Power System
Authors: Li Yan Xi , Song De Chao , Liu Gang , Geng Huan Geng , Gong Liang Fa
Published: June 2013

This paper is basic on a new production small-scale mining road header. It researches the characters of the hydraulic system and mainly concerns on its constant power systems mathematical models, analysis of stability of working condition, the simulation and modulation using the software of AMESim.
First Flight Experiment with the NERVA-1 Inertial Platform
Authors: Constantinescu Cristian E. , Rugescu Radu Dan , Ciochina Silviu , Cacoveanu Remus C.
Published: June 2013

The guidance system of the NERVA small space launcher is based on the six degrees-of-freedom information delivered by an inertial platform. Due to the main scope of the project sponsored by the Romanian Ministry of Education, Research, Youth and Sports to build a cost-effective space launcher, the inertial platform was built with extensive use of on-the-shelf, low cost inertial sensors and equipment. Concerns regarding the behavior and reliability of the sensing block were solved during the first flight experiment in June 2010, on-board the military, unguided drone missile RT-759-01 NERVA-1 and the results are described. The behavior of the electronics under the dynamical loads of the rocket flight, involving overloads of more than 20 g-s and the level of vibration during the real flight was the focus of the flight test, the first ever performed in Romania. The data were broadcast through a eight channel telemetry chain and received on the ground in two different locations for reliability enhancement. The data acquisition performed very well and supplied the basis for further development of the more accurate orbital injection guidance system of the NERVA launcher of small satellites in LEO.
Study of Nano-Precipitate in High Strength Low Carbon Steel during Tempering by TEM
Authors: Zuo Long Fei , Qiu Li Li , Hou Bin , Chen Xiao Hua , Chen Ming Wen , Wang Zi Dong
Published: June 2013

The behavior of nanoprecipitates of 800Mpa grade high strength low carbon steel during tempering has been studied. Transmission electron microscope (TEM), high resolution transmission electron microscopy (HRTEM) and energy dispersive spectrometry (EDS) were used to systematically analyze the morphology of precipitates and their grain orientation with matrix at different tempering temperatures. Experimental results confirm that the composition of these nanometer sized particles in the matrix was compound carbonitrides containing Ti, V, Mo and other elements. The precipitates of the as-received steel are (Nb,Ti)(C,N) at low tempering temperature, while those at high tempering temperature are composite carbides containing a variety of elements such as Mo, V, Ti and Nb. On the other hand, as tempering temperature increases, precipitates in the steel were slowly growing up and roughening according with the typical Oswald ripening mechanism; a sharp orientation relationship exists between precipitates and matrix.
Compressive Properties of Mg-3Al-2Zn-2Y Alloy at Different Strain Rates
Authors: Liang Hao , Tan Yun , Zhang Fang Ju , Zhang Kai
Published: June 2013

The compressive properties of Mg-3Al-2Zn-2Y alloy at room temperature at strain rates in range of 0.001s-1~4800s-1were investigated. To the alloy compressed at 1300s-1, its basal and non-basal slip produce the mixed dislocation configuration including parallel, bended and tangled dislocation. There is significant twinning in the alloys compressed at 1800s-1and 4800s-1. The flow stress and ultimate trength show the strain rate hardening behavior at the range of 0.001s-1~1800s-1. There appears localized deformation zones formed with recrystal grains and twin crystals in the alloy compressed at 4800s-1, whose mechanical properties are lower than those of alloy compressed at 1800s-1.
Applications of Fractal Theory in Selecting Bridging Materials in Jilin Oilfield
Authors: Luo Hui Hong , Wang Ze Hua , Sun Yu Xue , Sun Jiu Zhou
Published: June 2013

Bridging technology is one of the most effective methods to prevent the solid and liquid phases into the well fluid from invading the reservoir. And selecting the bridging agent which best matches with the reservoir pore size is the key of the successful implementation of bridging technology. Because of the lack of precise and quantitative degree of the preferred theory of bridging agent in field applications, temporary blocking fractal theory has been introduced. The reservoir pore size distribution and the fractal geometric distribution characteristics of bridging agent have been described. At the same time, the temporary blocking fractal theory and the fractal dimension calculation have been introduced. Conduct temporary blocking experiments on the core of Jilin Oilfield by this theory and the results proved to be perfect. As a result, the correctness of temporary blocking fractal theory has been verified.
Study on Environmental Materials with Review of the Environment and Refrigerant Developments
Authors: Li Jie , Luo Yong Qian
Published: June 2013

Provide a brief summary of the use of environmental materials in general and marine refrigeration, and the ban on the use of CFCs. Discusses alternative refrigerants, their advantages and disadvantages. Describes some changes made to improve the environment which have had unforeseen and adverse effects on safety and the reasons why we need more case histories. Also discusses the reasons why there are no permanent solutions to safety problems and the reasons why senior managers should become more involved in safety problems.
Experimental Study of Bending Toughness on Hybrid Fiber Reinforced Concrete
Authors: Shi Jin Song , Yuan Bo , Wang Da Zhang , Lu Zhe An
Published: June 2013

In order to investigate the difference of current toughness index standards for fiber reinforced concrete, two main groups of specimens were made to take bending toughness test with the requirements of corresponded standards, loading methods and loading speeds, which are ASTM C1018 in America, ACI 544 and JSCE G552 in Japan. United with software Origin, the load-deflection curves gathered from bending test was calculated with relative standards. The results show that the calculated toughness index value with ASTM C1018-98 in America is more accurate with three grades but the requested deflection of testing is much longer than others while ACI 544 and JSCE G552 in Japan are quite the contrary.
Study on Theoretical Mechanics with Mechanics Properties in Exercise Class
Authors: Huang Ju Hua
Published: June 2013

In order to promote the students to master the mechanics concepts and mechanical properties，the exercise class must be paid attention highly besides basic theory in the learning of theoretical mechanics. Many practices prove that one problem with more solutions is an effective method.
A Relative-Stress Based Method for Structural Shape Optimization
Authors: Wu Zhi Xue
Published: June 2013

A gradientless method for two-dimensional shape optimization is developed based on the magnitude of local relative-stress difference along the design boundary. The design boundary is modeled by using cubic splines, which are determined by a number of control points. The optimal shape of a design boundary with constant stress is achieved iteratively by moving control points consecutively (correspondingly, changing the shape of the design boundary) by an amount depending on the relative-stress difference between two neighboring boundary points. The key feature of the optimization method is that no arbitrary threshold stress is required. The result quality in terms of accuracy and efficiency are tested and discussed with several finite element analysis examples.
Preparation of FGD Gypsum-Fly Ash Plaster Material
Authors: Zhu Jiang , Li Guo Zhong , Du Chuan Wei
Published: June 2013

FGD gypsum-fly ash plaster material was prepared by desulfurization gypsum plaster and fly ash as main materials, compound retarder A (composed of citric acid, sodium metaphosphate and borax), methylcellulose (MC) as super absorbent polymers (SAP) and water reducing agent of lignosulfonate. Mix proportion was determined through studying effects of the experimental factors, including fly ash mixing amount, retarders of citric acid, bone glue and compound retarder A, and SAP of MC and dextrin, on plaster material properties. Final mix proportion was followed as: FGD gypsum to fly ash mass ratio of 4.0, compound retarder of 0.2%, methylcellulose of 0.2% and lignosulfonate of 0.1%.
Analysis on Wind-Induced Vibration Dynamic Responses of Transmission Tower-Line System
Authors: Hu Xiao Guang , Yang Jing Bo , Yang Feng Li
Published: June 2013

Tower-line system of overhead transmission line are sensitive to wind. Therefore, dynamic effect of wind load should be taken into consideration, for instance, wind-induced vibration coefficient. There might be some errors in the calculation of the coefficient in accordance with ‘Load code for the design of building structures’, for its ignoring the irregular figure, scattered masses and coupling effect of tower-line system. Tower-line system is set up in virtual environment, with tower-line coupling considered, and research wind-induced vibration dynamic responses under Davenport wind speed spectrum. Random vibration theory was applied to calculate the coefficient. Whole tower was divided by hight, and calculated segment’s the wind-induced vibration coefficient seprately. Compare the coefficient from Load Code and random vibration theory, the latter with tower-line coupling effect and tower figure considered, is close to the actual.
Research on Optimal Operation of Raw Water Pumping System Based on Hydromechanics in Waterworks
Authors: Huang Shi Feng , Wang Feng , Xu Hui , Wei Xiao Xian
Published: June 2013

According to the raw water pumping system with constant speed pump and variable speed pumps based on hydromechanics in waterworks, the hydraulic simulation models were built including pump station, water tanks, suction well etc. Based on the analysis of objective function and constraints of water treatment structures and consideration of pump operation and initial water level of clean-water-tank, the compact optimal operation mathematical models were built. Finally, correctness and advantage of the mathematical models were proved by the optimal simulation of Jinshan water supply project, which provided the valuable reference for the energy-saving operation of raw water pumping system.
Study on Simulation Processing and Engineering Experiment of Spinneret Hole Bottom Based on Material and Mechanics Properties with Different Transition Angles
Authors: Zhao Qian Cheng , Shi Na , Yang Chong Chang
Published: June 2013

The transition angle of spinneret hole bottom is usually concentrated in the three kinds of angle, 60o, 70o and 90o. Based on special processing on the transition angle of spinneret with SUS630 hole bottom and high-quality finish requirements, this paper analyzes special tool spade drill by Deform-3D FEM simulation, contrasts the trend of the axial force and torque in stable condition, and determines the optimal automation of processing parameters by engineering experiment, the angle 90o is not easier to prone the phenomenon of chipping knife, and easier processed rather ran the angle 60o and 70o, verify the results of FEA simulation.
Study on Energy Materials with Energy Level Width of 2DEG in Triangular Well
Authors: Xu Gang , Sun Yue
Published: June 2013

Applying theories on quasi-classical particles and the uncertainty relation of quantum mechanics, we deduce the formula of energy uncertainty in energy materials with electric field .We use it to two dimension electron gas (2DEG) in triangular well and get its energy width. Based on these, we find energy width will increase along with the increasing of electronic field intensity. At the same time, the energy width of the first excitated state is wider than the ground state, At the same time, the result of this paper is agreement with the experiment.
Study on the Preparation and Properties of Fiber Reinforced Foamed Cement Material
Authors: Li Xiao Long , Li Guo Zhong
Published: June 2013

The ordinary portland cement was used to prepare foamed cement insulation materials by physical foaming method. The influence of different process of fiber added to the foamed cement insulation materials on its performance was studied and the optimum mix ratio of raw materials was determined. The results showed that the glass fire could be evenly dispersed in the slurry by dry adding technology and got better enhanced effect. When the dosage of glass fire was 0.9%, the performance of the foamed cement material as follows: dry density of 318 kg/m3, 3d flexural strength of 0.61MPa, 3d compressive strength of 1.05MPa, thermal conductivity of 0.065W/(m·k). The reinforce mechanism of glass fire was explored.
Study on Photoresponsive Functional Materials with Efficient Synthesis, Properties of a Novel Unsymmetrical Photochromic Diarylethene
Authors: Jia Hong Jing , Pu Shou Zhi
Published: June 2013

A novel unsymmetrical photochromic diarylethene derivative, which is named 1-[2-methyl-benzofuran]-2-[2-methyl-5-(3-trifluoromethyl)-3-thienyperfluorocyclopentene, was synthesized. At the same time, its photochromic, kinetics and fluorescence properties were investigated detail. The result indicated that this compound had good thermal stability and exhibited reversible photochromism, changing the color from colorless to crimson both in hexane and PMMA film upon irradiation with 297 nm UV light, respectively. In hexane, the kinetic experiments showed that the cyclization/cycloreversion process of the compound was determined to be the zeroth/first reaction. The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer upon irradiation with appropriate UV light in hexane solution. In addition, the results demonstrated that the unsymmetrical diarylethene compound, which we have synthesized, had attractive properties for potential application in optical storage.
Material Properties with Syntheses and Properties of a Novel Unsymmetrical Photochromic Diarylethene
Authors: Xia Shui Jun , Liu Gang , Cui Shi Qiang
Published: June 2013

A novel unsymmetrical diarylethene derivative bearing thiophene moieties, in which a methyl group was substituted at the ortho-positions of the terminal phenyl ring, was synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film,and its absorption maxima were observed at 556 nm in hexane and at 560 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer upon irradiation with 297 nm UV light in PMMA.
Study on Material Properties with Synthesis and Property of a Novel Unsymmetrical Photochromic Diarylethene
Authors: Xu Hong Yan , Pu Shou Zhi , Wang Ren Jie
Published: June 2013

A novel unsymmetrical diarylethene derivative bearing both benzofuran and thiophene moieties, 1-(2-methyl--3-benzofuranyl)-2-[(2-methyl-3-thienyl-5-thienyl)-3-thieny perfluorocyclopentene (1o), was synthesized. At the same time, its photochromic properties were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 523 nm in hexane and at 539 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. Finally, using this diarylethene as recording medium, polarization optical recording was carried out successfully.
Study on Material Properties with VLISP Based CAD Parameterization Applicable for Casting Sprue
Authors: Zhang Chao , Yu Xiang , Di Jing Jing , Yang Yi Yong , Lv Jing
Published: June 2013

Casting sprue is required to parameterize for suiting material processing and developing casting quality so as to find the best casting sprue for the corresponding material. In this work, parameterization for casting sprue for different materials is conducted using Visual LISP. The main procedures are like this in sequence: establishing dialog for the casting sprue parameters of variable materials, drawing programming, entering the shape parameters of one material into the dialog, directly outputting its model through CAD. Combining techniques of material casting, CAD and Visual LISP together offers following merits: (i) simplify repetitive sprue design among different materials and develop drawing efficiency by making certain CAD function automatic. (ii) develop sprue design efficiency among different materials by leaving many similar structures of different materials to a computer program.
The Middle Jurassic Source Rock Condition of Circumjacent Depressions and Exploration Potential of Camck-Aral Sea Zones
Authors: Hu Hui Ting , Xue Hai Tao , Wang Yi Han , Chen Xiao Dong
Published: June 2013

In order to evaluate the exploration potential of CamckAral sea zones, the geological and geochemical data, qualitative appraisement and quantitative calculation method are used to study the Middle Jurassic source rock conditions of circumjacent depressions of CamckAral sea zones. This research indicates that: the Middle Jurassic source rock in these depressions are relatively development, with type II2 and III organic matter which have a higher gas generation potential; and organic carbon content is relatively higher; the thermal evolution of the organic matter has reached maturation stage. It means that the north Camck zone and water area of Aral sea have more exploration potential.
Material Selection of Gas-Well Wellhead Assembly and Application in High-Sulfur Gas-Well
Authors: Li Ling Feng
Published: June 2013

For natural gas well, material selection of gas-well wellhead assembly is an important factor of gas production system life. In order to ensure the long-term development of gas wells, this paper mainly introduces the material selection of gas-well wellhead assembly, proposes the optimization idea and technique of gas-well wellhead assembly. By taking W well as an example, this paper optimizes the material selection of gas-well wellhead assembly for W well. For application, the optimal materials of gas-well wellhead assembly in W well have good performance of corrosion resistance.
Pilot Scale Experiment of Magnetite Concentration with Material Properties from Yunan Province
Authors: Deng Rong Dong , Liu Quan Jun , Yang Xiao Feng
Published: June 2013

The situation of a pilot experiment of magnetite concentration from yunnan province was introduced.After five days of continuous production, magnetite concentrate is of good quality and the process is stability, the contents of mainly impurities are low. The beneficiation process has strong adaptability. The technical index is advanced and the test time and operation conform to the standard. The data of experiment can be used as a basis for industrial design. This test to increase enterprise efficiency and reduce the environmental pressure is of much benefit.
Effect of Flow Velocity on Corrosion in Gas Well Tubing and Application
Authors: Li Ling Feng
Published: June 2013

For natural gas well, effect of flow velocity on corrosion in gas well tubing is an important factor of gas well life. In this paper, we mainly introduce corrosion problem of insufficient gas-flow velocity in tubing, multiphase flow erosion and corrosion, erosion and corrosion problem of in-tubing gas flow velocity higher than erosion flow velocity, application on selection and determination method of minimum tubing size avoiding erosion due to excessive flow velocity in gas well. For application, the technology above has a good practicality.
Study on Mechanical Mechanics with a Method for Minimum-Time Path Planning of Robots in Cartesian Space
Authors: Xu Xiang Rong , Shi Dong Qing , Lu Man , Xu Hao , Zhou Tao
Published: June 2013

This paper presents an approach for robot motion path planning in Cartesian space. The motion trajectories are specified by a group of parameter equations in Cartesian coordinates. The time interval [0, is divided into m segments, and the coefficients of polynomial at each segment can be obtained in recursive form. The problem of minimum-time path planning and the determination of m are also studied.
Study on Mechanical Mechanics with Technical Points in Foundation Design of Offshore Wind Turbines
Authors: Mei Bi Xiang
Published: June 2013

By its application environments and structure features,the five key technology issues in foundation design of offshore wind turbines including structure mechanical mechanics analysis,foundation type selection,pile design,wave force calculation,structure fatigue analysis are discussed in this paper.The corresponding technical resolution and research methods are also provided.It is aimed to provide a useful reference for the foundation design of offshore wind turbines.
Research on Mechanical Mechanics with Fault Diagnosis Method for Gearbox Based on Relevance Vector Machine
Authors: Zhao Hu Cheng
Published: June 2013

In order to more effectively solve some difficult problems in gearbox failure diagnosis, a gearbox fault diagnosis method based on Relevance Vector Machine (RVM) is proposed. RVM is developed in Bayesian framework. It does not need to estimate the regularization parameter with less relevance vectors, and its kernel function does not need to satisfy Mercer condition. Simulation results show that: compared with the traditional BP neural network, RVM has the faster modeling speed, more accurate diagnosis, and is worthy of promotion and application in fault diagnosis of the gearbox.
Study on Mechanical Automation with Analysis and Research of Linux Nested Driver Based on FPGA
Authors: Yin Zhi Jian , Zhang Hao , Liu Qi
Published: June 2013

As a result of the need, not only the Linux NIC driver but also the Linux PCIe driver needs to be used in vehicle automation. The nested driver technique have its greatest use in mechanical automation, in this thesis, analysis and research have been made for Linux nested driver which was based on FPGA detailedly, firstly, it provides a simple review of standard NIC driver in the Linux operating system; secondly, Linux PCIe driver which was based on FPGA is presented simply; finally, it gives a brief explanation of how to call some functions of PCIe driver in the Linux standard NIC driver, and the accuracy and stability of Linux nested driver were tested and verified by a program in the application layer.
Study on Electrical Automation with Design of Programmable Control Voltage/Current Source
Authors: Zhai Yu Wen , Liu Wei , Yang Xiao
Published: June 2013

The design of programmable control voltage/current source based on MCU C8051F410 is introduced. The system mainly consists of D/A converter with PWM, voltage/current conversion circuit and digital display circuit. It can provide with DC voltage within the ranges of 0 to 200mV, 0 to 2V, -10V to +10V; and provide with DC current within the range of 4 to 20 mA. The programmable control voltage/current source can be used as the standard signal source for thermodynamic instrumentation, especially for the adjusting and testing for ADC or precise litter signal amplifier in the field of electrical automation.
Study on Mechanical Mechanics and Automation with the System Analysis and Design of the Torque Limiter Functionalities
Authors: Lai Po Szu , Yang I Chiang , Juan Yu Lin , Chen Tsair Rong , Chen Ching Mu
Published: June 2013

This study mainly investigates and researches the production of micro-torque limiters by using magnetic force and infrared optointerrupters therein including a permanent magnet, a magnet set, a grating disk, an infrared optointerrupter and a microprocessor, a torque-driven screw rod with the torque generated by the magnetic adsorption force. As the torque limiter is a clutch body, when the external resistance is greater than or equal to the magnetic torque, the rotation of screw rod will stop but start sliding simultaneously. When the screw rod stops rotating, the shutter detection disk also stops rotating. Correspondingly, the pulse signal output of infrared optointerrupters stops. Therefore, the motor of MCU stops by precisely determining whether the screw rod is stopped by external force with the function of torque limiters well exerted. As such, a product advantaged with streamlined sizes, long life expectancy, higher stability, low cost and handy control is reachable.
Study on Artificial Polycrystalline Piezoelectric Material with the Calibration Mechanism of the Micro-Displacement Sensor Based on Piezoelectric Ceramic
Authors: Yu Pei Jun
Published: June 2013

In this paper, a calibration mechanism of sensor based on artificial polycrystalline piezoelectric material and a kind of micro-voltage output system have been designed through understanding the characteristics and the parameters of the capacitive displacement sensor, so as to achieve the sensor calibration interval reaches the piezoelectric ceramic resolution of 5 nm. Through the measured values in the condition that 10mV/100mV is input to piezoelectric ceramic, it can be seen that the design meets the initial requirements. Such mechanism can be used for the calibration of a variety of high-precision sensors; however, it must be used in a stable environment.
The Numerical Method Analysis of the Natural Convection and Heat Transfer in the Room with Heat Transfer of Material and Radiation Coupled in Natural Convection
Authors: Zhan Nai Yan , Huang Kai Lin , Sun Li Mei
Published: June 2013

In this paper, the additional source term method is applied to the flow and heat transfer problems with radiation. According to the solid radiation surfaces situation, the effects of radiation on heat transfer can be divided into two cases. One is that the solid wall is in the solver region. The conduction, heat transfer and radiation act together in the interface between solid and liquid. This is the problem of combined conduction, heat transfer and radiation. The other is that the solid wall is the boundary of the solver region. The radiation heat is used as boundary condition. The solution method is different to them.
Study on Environmental Materials with Treatment of Sweet Potato Starch Wastewater by Coagulation Precipitation Method
Authors: Tian Xia , Shi Yan Xi , Lin Guo Lin , Zheng Qing Zhu
Published: June 2013

This study aimed at, pre-treatment of sweet potato starch wastewater and acquisition the application conditions of environmental materials though coagulation precipitation. The removal rates of COD and turbidity were investigated by process to find kind and quantity of suitable coagulant, quantity of coagulate aids, pH and setting time. The results showed that poly aluminum ferric chloride (PAFC) was chosen as an optimum coagulant for effective treatment. The optimal coagulation precipitation conditions were determined as follows: pH8, dosage of PAFC 1200mg/l, PAM100mg/l, sedimentation time 30 min. At optimum conditions of coagulation precipitation stages, the removal rate of COD and turbidity reached 25.8% and 67.5%, respectively. Therefore, coagulation process reduced the burden of subsequent wastewater treating.
Corrosion Protection Design of Support Structures for Offshore Wind Turbines with Analysis of Material Properties
Authors: Mei Bi Xiang
Published: June 2013

The paper provides a review about the corrosion ,corrosion protection and material properties of support structures for offshore wind turbines. Firstly, the current state of corrosion protection research on offshore wind turbines is discussed. Secondly, types of the marine corrosion environment, corrosivity categories and material properties are summarized in a systematic way.Finally, practical solutions to the corrosion protection of support structures, including cathodic protection ,coatings and silane impregnation, are discussed.
Design and Analysis of Automatic Ballot Box Based on SolidWorks Motion
Authors: Wang Xian Hu , Cheng Yu , Zhang Jing Nan
Published: June 2013

This article analyzed the design idea and implementation method for the structure of the automatic ballot box. It constructed the model of parts and assembly design of the ballot box based on the powerful feature modeling function of SolidWorks and finally worked out the finite element analysis on key parts. It thus successfully developed the automatic ballot box. It improved the enterprise's ability of independent development, obtained better economic benefits, and was the good application of CAD/CAM/CAE technology.
Study on Chemical Materials with Design of Chemical Molecular Structure Images Identification System Based on VC++ and MATLAB
Authors: Guan Yan , Zhong Zhao Man
Published: June 2013

In this paper, the system of chemical materials with design of chemical molecular structure images identification is introduced in detail. In order to reduce the algorithm complexity, increase the program execution efficiency, the system is completed based on the hybrid programming of VC++6.0 and MATLAB. The method proposed combines the advantages of VC++ and MATLAB, it shortens the time to write code algorithm, reduces the workload in programming and simultaneously increases the execution efficiency.
The Application of Biomaterials and Tissue Engineering on Wrist Ligament Injury
Authors: Yan Shi Fang , Qin Zhi Ming , Hou Jiang Yuan
Published: June 2013

This paper summarized the application of main artificial biomaterials and tissue engineering on repair of exercise-induced wrist ligament injury, on the basis of analysis about artificial biomaterial intervention of wrist ligament injury. At present, the anatomical, histological and biomechanical properties of wrist ligament has been studied in the domestic and foreign research; however, the studies about the application of artificial biomaterials and tissue engineering technology in the repair or reconstruction of exercise-induced Wrist ligament injury were very rare. With the development and progress of cell biology and molecular biology methods and technology, the research of ligament injury repair has entered a new stage, the new development of artificial biomaterials and tissue engineering provide a new direction for the Treatment and rehabilitation of exercise-induced wrist ligament injury.
Fractal Research in Metal Material Fracture Invalidation
Authors: Guo Li Hui , Hu Wan Qiang
Published: June 2013

Though there are a lot of rules and models for metal material fracture, it makes lots of troubles for engineering application, because of the lacking of reasonable description of fracture principle and change law. This article discusses some basic problems of applying fractal geometry to fracture research, mainly including sectional fractal characteristics and measurement, the relationship of fractal dimension and fracture toughness, and some kinds of metal fractal models. At last, application of fractal theory in metal fracture is stated.
Microstructure and Anti-Friction Effect of Ball-Milled Expanded Graphite
Authors: Zhang Hong
Published: June 2013

Expanded graphite (EG) was ball-milled in a high-energy mill (planetary-type) under an air atmosphere. The products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The anti-friction effect of milled EG used as lubricating additive was investigated. After ball-milling, the relatively ordered graphene planes of original EG become deformed, and the d002 spacing becomes broadened. The milled EG used as lubricating additive have an anti-friction effect, and the effect is more marked than that of original EG.
High Temperature Resistance Effect of SrO/(SrO+CaO) in Alkali-Free Boro-Aluminosilicate Glasses
Authors: Tian Ying Liang , Guo Xian Long , Zhu Man Kang , Sun Shi Bing , Li Yong Li , Liu Wen Tai , Ding Jack Y
Published: June 2013

This paper studied the change regulation of the electrical resistivity of alkali-free boro-aluminosilicate glasses with the rate of SrO/(CaO + SrO) in the range 600~1600°C.The results showed that a mixed alkaline effect was observed with the increase of SrO content in alkali-free aluminoborosilcate glasses: the maximam resistivity of 178Ωcm appeared at SrO/(CaO+SrO) ratio =0.24, which is much larger than 108Ωcm at SrO=0. Meanwhile, the experiment results showed that the SrO makes stronger influence on the resistivity of the glass than CaO does. The Arrhenius plots, which showed the change of the resistivity with temperature in range of 1100~1625°C, present nonlinear variation, and an inflection at about 1100°C. It proved that the electrical resistivity of the alkali-free aluminoborosilcate glasses were controlled by the ionic radius of alkaline earth metals and the viscosity of glass melts.
Syntheses of Tabular Cobalt Ferrite Crystal Using Non-Equilibrium Crystallization Conditions
Authors: Jian Gang , Shao Hui , Hu Qing Xian , Lu Sheng
Published: June 2013

Cobalt ferrite CoFe2O4tabular crystals were synthesized via two-step coprecipitation using non-equilibrium crystallization conditions by supplying a solution of CoCl26H2O and FeCl36H2O and a solution containing NaOH at a later crystallization stage. Mean particle size of ~16.5 nm CoFe2O4primary particles synthesized by coprecipitation showed non-oriented structure. Effect of heat treatment temperature on the microstructures of the final CoFe2O4crystal was examined, orderly arranged plate-like tabular CoFe2O4crystals were formed under calcination at 800 °C. Magnetic hyspersis loops measured at 300 and 5 K indicated the anisotropy in the tabular crystals.
Preparation and Characterization of SiCOH Film Using a New Precursor Trimethoxy [2-(oxabicyclo [4.1.0] hept-3yl) Ethyl] Silicane
Authors: Ding Zi Jun , Ding Shi Jin , Shen Ying Zhong
Published: June 2013

The SiCOH film has been prepared by using a new precursor of trimethoxy [2-(7-oxabicyclo [4.1.hept-3-yl) ethy silane via sol-gel and spin-coating methods. The resulting films were characterized by SEM, TGA, AFM, FTIR, nanomechanical testing, and electrical measurements. The TGA result shows that the SiCOH film has good thermal stability, and no obvious thermal decomposition can be observed before 400°C. After being annealed at 350°C for 2 hours, the resulting SiCOH film exhibits a smooth surface (RMS=0.222nm), and a significant reduction of CHn groups in the film. Further, the film exhibits a novel high k value of 15.6, a leakage current density of 2.72 × 10-6 A/cm2 at 1 MV/cm, and good mechanical properties of Er ~ 12.61 GPa and H ~ 3.80 MPa.
Use of Strain Energy Density W and Qo as Quality Indices for Rating the Quality of Cast Aluminium Alloy354 as a Function of Processing Parameters
Authors: Sibal Prateek , Babu G. Dinesh , Rao M. Nageswara
Published: June 2013

Cast aluminium alloy 354 has found widespread application in the automotive industry for its excellent mechanical properties and good castability. The stringent emission norms and demands for improved fuel economy have pushed automobile technology to new frontiers. This has led to efforts to reduce weight while maintaining higher vehicle performance. Cast aluminium alloy 354 is a material that performs with reasonable effectiveness in the high stress automobile environment. The present study looks at the use of strain energy density W and the quality index Qoto determine the effect of process parameters like aging temperature and modification on the quality of the alloy 354 and also to monitor the effect of interrupted heat treatments T6I4 and T6I6 on the quality of the material. The strain energy density W calculated for the interrupted heat treatments on alloy 354 show a broad inverse relation with yield strength Rp. An improvement in the yield strength and the strain energy density of the alloy is observed when the alloy is subjected to modification. At artificial aging temperatures lower than the artificial aging temperature adopted in standard aging treatment an improvement in the Qo and W quality of the alloy 354 have been observed.
Comparisons of Nanocrystalline Cu, Ag, and Al Prepared by Room-Temperature-Molding Method and Vacuum-Warm-Compaction Method
Authors: Liu Wei , Zhou Qiong Hua
Published: June 2013

Nanocrystalline nonferrous metals (Cu, Ag, and Al) were fabricated by room-temperature-molding method and vacuum-warm-compaction method, respectively. X-ray diffraction, Positron annihilation spectroscopy, and density test were utilized to characterize these as-prepared nanocrystalline specimens. The thermal stability and micro-void distribution of the as-prepared nanocrystalline metals were compared and discussed in detail. The experimental results show that the increasing of density is unremarkable while the microstrain reduces during warm-compaction process. The nanocrystalline nonferrous metals prepared by VWC have better thermal stability. Positron annihilation spectroscopy analysis indicates that, compared with the specimens prepared by RM, the average size of micro-void and proportion of single vacancy is a little larger in nanocrystalline copper fabricated by VWC.
Study of Hybrid Photovoltaic Materials with Poly(3-Hexylthiophene) and CdS Nanoparticles by Spectroscopic Techniques
Authors: Zhang Wen Zhi , Lin Yang Jing , Zheng Jian Long , Chen Hong Shu , Chen Wei Xing , Jing Xin Li
Published: June 2013

Poly (3-hexylthiophene) (P3HT) was synthesized via chemical oxidative reaction at room temperature with anhydrous ferric chloride as oxidant. The hybrid films of P3HT were prepared by doping inorganic semiconductor nanoparticles of CdS. Fourier transform infrared (FT-IR) spectrum, UV-vis, fluorescence and resonance light scattering (RLS) spectra were applied to characterize the photophysical properties of P3HT and doped polymer. The results indicated that the infrared absorbance of hybrid films increased with the increase of doped CdS content. The intensity of UV absorption presented a slight increase, the blend spectra were simply the sum of the absorptions of the constituent parts of the composite solution. With the addition of CdS nanoparticles, the emission peak of P3HT was shifted to longer wavelengths. The shift from 543 to 567 nm was due to the fluorescence resonance energy transfer between CdS nanoparticles and P3HT, and then the red-shift from 567 to 573 nm was caused by the agglomeration of CdS nanoparticles. RLS spectra revealed that the maximum scattering wavelength of systems initially showed a blue-shift, and then exhibited a pronounced red-shift with the addition of CdS nanoparticles. These findings provided insights into the role of spectroscopic techniques in studying the photophysical properties of composites. Our further work is toward investigating the mechanism and dynamic process of exciton interaction between polymers and inorganic semiconductor nanoparticles.
Synthesis and Photoelectrical Properties of Graphene-CuxO Nanostructures
Authors: Zhu Qian Qian , Yu Jian Hua , Wang Xiao Xia , Xu Li Li , Cao Lei , Dong Li Feng
Published: June 2013

As a promising two-dimensional nanomaterial with outstanding electronic, optical, thermal, and mechanical properties, graphene has been investigated for many applications. In this work, we present a facile route for the integration of graphene with light-sensitive copper oxides for optoelectronic applications. Graphene synthesized by a solvothermal process is found to be a robust substrate on which photoconductive CuxO with a particle size of about 50 nm can be deposited by a simple method. The morphology of graphene and graphene-CuxO is characterized by SEM and TEM. Photoluminescence measurements are also conducted, and the results show that the excited fluorophore in the P3HT backbone is effectively quenched by the electronic interactions at P3HT/graphene interfaces; however, the incorporation of CuxO increases the excited fluorophore. Photoelectrical experiments show that clean, cheap and easily prepared CuxO/graphene has much stronger photo-induced electrical current compared with graphene, thus suggesting a promising candidate for organic photovoltaic applications.
Morphological Studies of Polyphosphazenes and their Nano-Composites Using Solid-State Nuclear Magnetic Resonance Spectroscopy
Authors: Sun Chu Chu , Hazendonk Paul , Borisov Alexey S. , Hayes Paul G.
Published: June 2013

Poly[bis(trifluoroethoxy)phosphazene] (PBFP) can be prepared via thermal ring-opening polymerization (ROP) of hexachlorotriphosphazene ((PNCl2)3) or ambient temperature cationic living polymerization (ALP) of monomeric Cl3P=NSiMe3, followed by introduction of OCH2CF3 groups via standard salt metathesis protocols. The resultant polymer morphology is dependent upon synthetic methodology, processing method (e.g. solvent casting, heat cycling, etc.) and the presence of inorganic nanoparticles, which were found to inhibit crystallization. 1H, 19F and 31P solid-state NMR spectroscopy was employed to investigate crystallization in solvent cast and heat-treated samples of pure PBFP and composites of nano-crystalline TiO2 doped PBFP.
Characterization of Iron Oxide Nanoparticles for Sol-Gel Dip-Coating Method Prepared Thin Films
Authors: Setina Janina , Gabrene Alona , Juhnevica Inna , Mezinskis Gundars
Published: June 2013

The paper describes two methods of syntheses of iron oxides, microstructure and morphology of magnetite nanoparticles. Nanocomposite thin films of SiO2/Fe3O4 have been prepared with sol-gel dip coating technique: dip-coating from SiO2/Fe3O4 sol and encapsulation magnetite between two SiO2 layers. Structural and morphological characteristics of iron oxides particles and prepared film were analyzed by X-Ray Diffraction, SEM, FTIR, DTA, AFM. AFM topography of surface and measurements of roughness has shown that using iron oxide encapsulation between two SiO2 layers to provide the even distribution of iron oxide, results as high quality films with low Rq values 1.5 2.7 nm.
Electrical Transport Properties of Single SiC NW-FET
Authors: Peng Gang , Ma Wen Bo , Huang Xiao Kun , Zhou Ying Qiu , He Yan Lan , Yu Xiao Yan , He Biao
Published: June 2013

A single SiC NW-FET (nanowire field effect transistor) was fabricated by FIB (Focus-Ion-Beam) method and the photo-electric properties of the device including I-V characteristic, transfer characteristic and time response et.al. were studied in this paper. SiC NWs (NWs) were prepared by pyrolysis of a polymer precursor with ferrocene as the catalyst by a CVD route. The NWs were suspended in ethanol by ultrasonic, then sprayed onto a silicon wafer with 300nm silicon oxide. Pt electrodes were deposited directly by FEI NanoLab 600i along with the SiC NW on silicon wafer. The transfer characteristic of the device shows that the SiC NW is a n-type semiconductor and photoelectrical measurements of the device show an rapid change of voltage when applied a constant current and explored the device to 254nm UV light. The mechanism of photo-electric properties are discussed in the last. Our results show that the single SiC NW FET could be applied to a harsh environment due to its own excellent electrical and optical properties.
The Study on the Influence of Molding Method and Thickness to Part Properties
Authors: Tao Wang , Yue Yan , Lei Li
Published: June 2013

A large polycarbonate plate molding with different thickness was conducted to investigate the differences between CIM and ICM. The results reveal that increase thickness can significantly reduce part shrinkage, and both part shrinkage and shrinkage difference of ICM are smaller than that of CIM. In addition, This study also shows the optical distortion is close relate to molding method and thickness, both ICM and thinner-wall can reduce the optical distortion.
Studies of Chemical Adsorption Membrane in the Steel Surface on Application
Authors: Chen Ze Min , Lu Pin , Yu Zhong Tao , Zhao Nuan
Published: June 2013

In this study we selected polyethylene glycol (400), triethanolamine, silane coupling agent and glycerol as the main raw material, and systematically studied the chemical adsorption film technology on the steel surface by taking one step. Under the optimum conditions ( polyethylene glycol (400) was 10mL/L, triethanolamine was 40mL/L, silane coupling agent was 10mL/L, glycerin was 15mL/L, the pH was 10, the time was 12min, and temperature was 45°C), we characterized the chemical adsorption film by SEM, XPS and IR. The results showed that the treatment process was simple, the tank liquor was stable, the chemical adsorption film was dense, uniform. This adsorption membrane resistance to corrosion and coating adhesion was superior to the traditional phosphating process.
The Research on Adsorption Behaviors and Mechanisms of Geopolymers on Sr2+, Co2+ and Cs+
Authors: Chen Yi Lan , Tong Yue Yu , Pan Rong Wei , Tang Jie
Published: June 2013

The adsorption behaviors and mechanism of geopolymers based on metakaolin-fly ash for Sr2+, Co2+ and Cs+ were investigated in static method. The results showed that the geopolymer has a strong adsorbability for Sr2+, Co2+ and Cs+ and the adsorbances are mainly affected by ion concentration and pH value of the solution. The adsorption dynamic model of the material for Sr2+, Co2+ and Cs+ is confirmed to be the first-order reaction and the adsorption isotherm curves showed that the adsorption behaviors belong to monolayer adsorption which is simulated by the Langmuir model very well. Desorption of Sr2+, Co2+ and Cs+could be carried on by immersing the adsorbents in the solutions with low pH or high ionic strength solution. Desorption experiments and XRD analysis indicate that the adsorption behaviors of geopolymer for the three kinds of ions are mainly chemical adsorption, according to the ion-exchange mechanism.