bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the High-Power Directional Acoustic Transducer
Authors: Zhao Guo Zhu , Ma Li Xuan
Published: April 2014

Through studying how to affect acoustic directivity with MATLAB software, it show that selection of a relatively larger surface of the transducer and a relatively closer transducer interval will be more preferable for directivity. While an array which possess more array element number and whose frequency of the drive signal can be as large as possible in a range, directivity will be more preferable. On the other hand, when the structure of the sound radiating surface of the transducer or array layout is symmetrical, the corresponding directivity pattern will be symmetrical. At a frequency of 10kHz, the individual rare earth magnetostrictive transducers its first point of the simulation carried out before the test. Sounding board with aluminum by the method used to improve the sound source diameter. With the sound plate diameter incrementing, the smaller the angle of the directivity. The beam width of the 3×3 array is about at 23kHz, and the directivity acute angle is about 10°, with a sounding board by the method used to improve their the diameter of the sound source, so as to realize the sound has directivity is feasible.
Research on Transverse Prestress Mechanical Properties Experiment of PC Box Girder
Authors: Zheng Yi , Chen Jian Zhang , Zhang Ke Chao
Published: April 2014

In view of the PC box girder transverse prestress tendon, the factors and the development of tension prestress performance affecting factors were analyzed. Experiment program of prestress tendon performance was designed. Test for steel wire and anchorage of transverse tendon were carried out. The performance data of steel strand and anchorage were tested. The transverse prestress steel beam pattern based on work performance test was analyzed.
Desilication of Collophanite Ores by Reverse Flotation
Authors: Zhao Jun Li , Ge Ying Yong , Yang Zhi Chao , Zeng Li Ming , Liu Lin
Published: April 2014

A phosphate rock containing MgO 7.95% and SiO29.64% has fine dissemination size, which is from Yichang city in Hubei province, China. Technical conditions of the ore were investigated by performing the desilication process of double reverse flotation, which adopted GE-609 to flotate silicon. The results showed that under defoamer DE-1 36g/t, phosphate concentrate with P2O531.91%, MgO 0.97%, SiO29.46% and recovery of 88.71% were obtained by employing the process of close-circuit reverse flotation.
Study on Recovery System for Marine Diesel Engine Waste Heat
Authors: Wen Shuang , Qu Xiao , Zhu Yu Liang
Published: April 2014

Firstly, this paper briefly introduces the Utilization status on marine diesel engine waste heat recovery. Combined with the characteristics of waste heat caused by marine diesel engine and technology of organism Rankine cycle, the paper designs a new waste heat recovery system for marine diesel engine based on organism Rankine cycle, And through researching the changes of temperature between marine diesel engine waste heat and the system working medium, pure organism R123, R245fa or R134a are selected as system's cycle fluid because of environmentally friendly and cycle performance more appropriate. The system application of economy on the ship are analyzed in the theoretical calculation.
Determination of Hydrated Lime Content in Asphalt Mastic Incorporating High Temperature Performances
Authors: Zhou Liang
Published: April 2014

Different hydrated lime content in asphalt mastic greatly influences the performances of asphalt mixture. The aim of this paper is to study asphalt mastic made with different content of hydrated lime was used in Dynamic Shear Rheological and Viscosity Tests. The optimum hydrated lime content was proposed in terms of test results above. The results illustrated that hydrated lime was an appropriate addition agent which can improve asphalt mastic properties greatly, however, too much hydrated lime may result in the decrease of asphalt mixture performances.
The Application of Modern Sealing Technology in Aircraft
Authors: Zhang Wen Guang , Lin Guo Min , Shang Miao , Zhou Fei
Published: April 2014

With the development of modern aircraft industry, the structure of the plane becoming more and more complex, and the sealing of parts is becoming stricter. Traditional sealing technology began gradually revealed its deficiencies. In this paper, the sealing method of the hydraulic system, oil tank, window and cover of the aircraft is introduced in details. The effective ways to seal have been put forward, and it also offering technical reference to the aircraft parts manufacturer.
The Simulation Study on Drawing and Forming of Automobile Panels Based on CAE
Authors: Liu Zheng , Huang Zhi Sheng
Published: April 2014

Automobile panels have the characteristics of thin material,complex shape,large structure and size and high-quality requirements on surface,so the workblank deformation is also very complicated in the process of forming, and it is vulnerable to forming defects such as wrinkling and cracking and so forth. Based on Dynaform, a method of parameterized design for automobile panels is discussed here, which includes the designs of stamping direction, addendum surface, binder surface and draw bead. The simulation and analysis on forming process of automobile panels provides a basis for completing modular surface design. Obviously, the results show that the simulation on forming process of automobile panels by Dynaform software shortens the mold development time and mold tryout cycle and lowers cost.
Experimental Research on the Operation of Solar Energy Desalination System
Authors: Chen Zhi Li , Hou Li An , Chen Guan Yi , Yao Yang , Yu Tao
Published: April 2014

This paper demonstrates a self-made solar energy desalination system of pouring falling film evaporation and condensation and multi-effect heat return, which adopts solar energy heat gathering system as the heat source and wind-power generation as the power supply, realizing the optimal matching of the whole system. The practical operation of the system is tested and the results show that the water yield per heat gathering area unit reaches 12 kg/m2·d when the solar radiation is 20MJ/d. Also, this paper explores and analyzes the main factors influencing the water yield, so as to figure out the favorable operating parameters.
Research and Analysis on the Retrofit Design of Caving Coal Hydraulic Support
Authors: Hu Min
Published: April 2014

The low caving coal hydraulic support can be transformed into standing shield hydraulic support which is mining full height in order to adapt to the change of mining conditions. On the basis of the analysis of the key elements of retrofit design, transformation practice of specific type of hydraulic support is carried out. The result shows that retrofit design is effective and has an important practical value .
The Design of Photovoltaic System on a New Catamaran with Solar Power
Authors: Lv Zheng Xiang
Published: April 2014

The design is in view of the features stenosis and short-range of inland waterways, applying photovoltaic technology of solar to the small-and-medium-sized boats, combining solar-power generation with the technology of electric propulsion of marine. It advances ship design and optimization, component design and matching, and reasonably layout solar panels on the boat and the pier, without affecting the tourism, designing a solar-powered catamaran to achieve zero emissions and the desired effect of energy saving.
Common Electrical Faults Diagnosis and Elimination of Loom
Authors: Lian Zhao Min
Published: April 2014

This paper discusses the faults of master clutch,broken weft parking,broken weft or warp no-parking,miss operation,inadequate parking and thick-film circuit,and corresponding solutions are put forward:Check clutch and replace the bearings timely when clutch has abnormal sound;Check the brake angle frequently;Pay special attention to the quality of the beam and the original yarn;Enforce vigorously the quality of the main parts; The adjustment of the sensor angle is very important;The most intuitive feel of broken weft or warp no-parking is the faults of sensor;Miss operation of loom dues to the circuit board fault or other faults,regulating improper self-locking,the peripheral circuit,starting circuit fault is in unable to conduction state,or stop circuit fault is in the power state;Inadequate parking shall check the setting position of micro switch.
Common Fault Analysis and Repair of Three-Phase Motor
Authors: Shang Miao , Lin Guo Min , Zhang Wen Guang , Zhou Fei
Published: April 2014

The common failures of three-phase motor are described, the specific reasons of failure are analyzed, the treatment of common failures are illustrated, the motor repair methods are summarized, the troubleshooting process is pointed out, the developing direction of common troubleshooting is put forward. For saving production resources, improving the efficiency of enterprise's safety production and economic benefit, it has important guiding significance.
Design of Multi-Function Keyboard Display Controller Based on FPGA
Authors: Bai Zhen Lin , Meng Zhi Yong , Yang Mei
Published: April 2014

The multi-function keyboard display controller can complete lots of job, which contain direct keyboard, matrix keyboard, LED digital tube dynamic scanning. The controller including button identification, automatic continuous functions and LED digital tube display , flashing and controlling the decimal point. At the same time, the external interface of the controller using the routine UART interface, established a perfect communication protocol. So that we can realize the access keys and control the display of LED digital tube. The multi-function keyboard display controller not only can overcome the disadvantages that traditional microcontroller system take more of the I/O lines and system resource, but also can use the mainstream Field-Programmable Gate Array completes system functions.
The Effect of Inlet Conditions on Particle Deposition in Axial Flow Compressor
Authors: Xu Hong , Yang Hua Dong , Hua Guang Ru
Published: April 2014

Axial flow compressor is an important component, so the compressor performance is of crucial. Fouling changes blade geometry and blade surface roughness is increased, thus aerodynamic performance is affected. The flow of gas phase and gas-solid coupling phase are implemented to reveal the effect of inlet condition on particle deposition. Based on Euler-Lagrange model, this paper made numerical simulation of gas-solid two phase flow in the axial flow compressor rotor cascade. Simulation result shows that the increase of inlet temperature can result in the reduction of particle volume fraction. And particle mass concentration is affected by particle mass flow rate.
The Antiplane Shearing Problem of Circular Holes with 2k Periodic Cracks in One-Dimensional Hexagonal Quasicrystals
Authors: Guan Lu , Chen Zhu
Published: April 2014

Using the method of complex analysis and by constructing conformal mapping, the study investigated the antiplane shearing problem of circular holes with 2k periodic cracks in one-dimensional hexagonal quasicrystals. Wherefrom we simulated the problem of antiplane shearing in circular holes of cross-cracks, single-cracks, symmetrical double-cracks, symmetrical four-cracks, as well as periodic straight cracks, and provided an analytic solution to the crack tip stress intensity factor (SIF).
Lyapunov-Index Application and Time-Frequency Analysis in Medical EEG
Authors: Li Xian Mao , Lv Jiu Ming , Zhang You Bing , Huang Xian Feng
Published: April 2014

With the development of the signal processing and the medical technique, EEG (electroencephalogram) check has been usually used to analyze the brain activity in the clinical medical, which can distinguish the abnormal circadian state from the normal circadian state. Here puts forth Lyapunov index analysis method to analyze the circadian state by the medical personnel or researcher, and the validity of the method is verified in some related graph through computer simulation, and all the method bridges a connection between the Chaos state and the medical EEG diagnoses.
Structure Analysis of Volcanic Rock Based on the Texture Feature in Imaging Logging
Authors: Xiao Xiao Ling , Zhang Xiang
Published: April 2014

The rock structure information is a very important feature in the complex lithology identification. However, conventional logging response characteristics of the rock structures are very weaker, resulting that the recognition rate of complex lithology is very low in conventional logging. With the help of imaging logging data with accurate, intuitive structural characteristics of the rock, the volcanic structure is analyzed in electronic imaging logging data in this paper. First, several structural characteristics of volcanic rock are introduced. Then, several texture features are extracted based on image processing method. Finally, imaging logging response characteristics of different volcanic structures are analyzed by means of histogram, and some texture features of imaging logging are chosen to identify volcanic structures in the cross-plot method. Real data processing analysis results show that texture features extracted from electrical imaging logging is effective to distinguish the structures of volcanic rocks.
Data Visualization Measurement in Location-Based Service
Authors: Feng Deng Chao , Wang Yong Long , Wang Hai Peng , Tan Zhen Kun
Published: April 2014

Data visualization is an emerging technology in location-based service. In this paper, the principle of moving target tracking and the transformation of coordinates were introduced. Latitude-longitude pairs of moving object were obtained by globe satellite data receiver and the map matching were adopted to realize the real-time target tracking correspondingly. Finally, the measurement data in location-based services were analyzed and presented by data visualization technology. The experiment results show the validity of the method.
Fault Diagnosis Method Based on KPCA and Selective Neural Network Ensemble
Authors: Pang Yan Yan , Zhu Hai Ping , Liu Fan Mao
Published: April 2014

Aiming at the problems of less study sample, large network scale and long training time existing in current fault diagnosis field, we develop a new method based on KPCA and selective neural network ensemble. First, reducing the data size by using KPCA to extract the sample features. Then achieving a selective neural network ensemble method based on improved binary particle swarm optimization algorithm (IBPSOSEN), and combining the two methods for fault diagnosis. In selective neural network algorithm, bagging method is used to take a number of different training sets of fault samples to solve the problem of less fault samples. Finally, simulation experiments and comparisons over Tennessee Eastman Process (TE) demonstrate the effectiveness and feasibility of the proposed method.
The Primitive Exponent of a Class of Special Nonnegative Matrix Pairs
Authors: Luo Mei Jin
Published: April 2014

There is a one-to-one relationship between nonnegative matrix pairs and two-colored digraph, so the problem of matrices can be changed into that of graphics to be solved. With the knowledge of graph theory, by studying the associated directed digraph of a class of special nonnegative matrix pairs, that is a class of two-colored digraphs whose uncolored digraph have vertices and consists of one-cycle and one-cycle are considered. The exponent and characteristic of extreme two-colored digraphs are given.
The Research of the Car Following Behavior Model in VANET
Authors: Yao Jian , Yang Deng Pan , Peng Hao You
Published: April 2014

Based on the characteristics of the car-following model and analyzing from the angle of traffic engineering, this paper classifies car following models into four categories, that is, the stimulus-response model, the safe-distance model, the psychology-physiology model and the artificial intelligence model. In addition, it expounds the modeling ideas, the model structures as well as the advantages and disadvantages of these models. Finally it points out the development tendency and the direction of study method of modeling of car-following model to show direction and provide important reference for establishing car-following models suitable for Chinese traffic characteristics.
Application of CDIO Idea in Engineering Training
Authors: Zhong Shou Yan , Chen Yong Zhi , Li Rong Yong , Chen Hai Bing
Published: April 2014

At present some problems such as valuing the professional knowledge and ignoring practice, the effect of students' engineering training is poor, Students ability training not implemented, exists in Higher Engineering Training. So, we propose the reference to the idea of CDIO. This idea has achieved good results in practice through becoming the main line for students growing up, through improving teaching philosophy, through integrating engineering training links, and through the cultivation of students' comprehensive ability running through university four years.
Initial Buckling of Compressed Rectangular Panels with Variable Stiffener Sizes
Authors: Khvyiuzov Arsenii , Xu Yuan Ming
Published: April 2014

Recent advancement in manufacturing technology has initiated a new phase of buckling structures analysis and structural design research development. As the ability to manufacture stiffeners in complex shapes has become increasingly more sophisticated, researchers are able to further enhance the design of thin-walled stiffeners. This paper presents an attempt to discover a structural design which employs the use of sub-stiffeners and the ability to retain maximal buckling load. FEM analysis was performed on compression loaded rectangular stiffened panels clamped on all sides to determine optimal attributes of two panel concepts: (1) stiffeners height changes according to sinusoidal law across the panel width, (2) stiffeners area changes according to sinusoidal law across the panel width. In both cases, total volume of the material was held constant. Non-dimensional parameters of the optimal panels were obtained. It was found that there was a positive correlation between the amount of change in buckling patterns caused by a sub-stiffener, and the amount of initial buckling load which could be obtained.
Research on the Budgetary Slack Behavior to the Construction Machinery and Equipment Manufacturing Enterprise in China
Authors: Duan Wei
Published: April 2014

In Chinese construction machinery and equipment manufacturing enterprises, the behavior of budgetary slack is an intractable problem in comprehensive budget management so far. In this paper, the causes of budgetary slack behavior, from points of agency theory, contingency theory, behavioral theory, psychology theory, information asymmetry theory and motivation theory, and from the lack of relativity between the theory and practice of management accounting, are analyzed systematically. Some management countermeasures are advanced to prevent budgetary slack. As the research consequence, the compromised point is the appropriate budgetary slack is not harmful to corporate performance.
Game Analysis of Reverse Supply Chain Based on Government Regulation
Authors: Cao Jian , Hu Li Ling , Yao Qing Qin
Published: April 2014

Extended producer responsibility (EPR) system is an environmental protection strategy to recycle end-of-life products. A dynamic analysis model between the government and the reverse supply chain (RSC) system operated under the EPR instrument was established. Game theory was applied to analyze the optimal fiscal policy of the government and the optimal decision of the participating enterprises. It concludes that governments environmental regulation is effective to improve the manufacturers remanufacturing rate and the recyclers effort-extent.
Wind Power Forecasting Based on Improved Biased Wavelet Neural Network
Authors: Mao Yu Han
Published: April 2014

Wind power prediction is the key to grid-connected wind power system. In this paper, first of all, we decompose and reconstruct the power sequence by wavelet analysis, and reduce the noise of the detail signal, to obtain the strong-regularity subsequence. We adapt the biased wavelet neural network rolling forecast model for the processed sequence to obtain seven days of rolling forecast results through several amendments. For the sequence of 5 minutes interval the prediction accuracy is 98.63%, for the sequence of 15 minutes interval the prediction accuracy is 99.88%.
Study of Friction Lubrication Characteristics Research for CVT Fluids in Field Test
Authors: Li Mao Sheng , Du Qun Gui
Published: April 2014

By the field test, we carried on the physicochemical tests, the lubrication performance test, the ferrographic analysis and ICP tests for different mileage of CVTF, we also ran the electron microscope analysis of the key components of steel belt of CVT’s friction pair and bevel pulley. The transformation law of CVTF’ lubrication, the inoxidizability, the friction durability friction, the antifriction performance, the attenuation characteristics of functional elements and the abrasion mechanism of Cone wheel and steel belt are investigated.The result showed that there was the presence of extreme pressure film on the surface of friction pair, the physicochemical parameters of CVTF changed very small, the wear metal elements in petrol within 3000km increased slowly.
An Assembly Prediction Model Based on GA-BP Neural Network
Authors: Wang Song Ling , Jiang Ming , Gong Cheng
Published: April 2014

The four key factors include gravity, roughness, bolt pressure and contact area as the input parameters of neural network, the GA-BP neural network was established for predicting the assembly deformation. And the experimental data is trained for this GA-BP neural network. Finally, the test data shows that BP neural network optimized by GA algorithm can achieve higher accuracy than BP neural network.
Analysis on Torsional Vibration Characteristics of Turbo-Generator Units Based on Finite Element Method
Authors: He Xi , Gu Yu Jiong
Published: April 2014

The torsional vibration problems of turbo-generator shafts are increasing widespread and sever under the coupled action between the turbo-generator unit and the power grid because of the complicated power grid structure. Thus, the accurate solution of torsional vibration inherent characteristics of the shafts is of great significance to do the safety evaluation. The finite element method (FEM) with higher accuracy is adopted to calculate the torsional vibration inherent characteristics in this paper. A 1000 MW turbo-generator shaft is taken as a studying object and its torsional vibration finite element (FE) model and solving process are introduced, using ANSYS software as implementation platform of the FEM. The simulation results show that the torsional vibration characteristics calculated by FEM are accurate and reliable.
Wind Turbine Tower Climbing System Design
Authors: Tian Song Feng , Zhu Ya Ning
Published: April 2014

Currently there is a certain degree of difficulty for China wind turbine blades and tower inspection and maintenance. In this paper, the design of wind turbine tower climbing system is mainly used in wind turbine blades and tower inspection and maintenance, which can replace altitude operations, reduce labor intensity of workers, improve the accuracy of inspection, and get experimental verification.
Research Status of High-Intensity Pulsed Electric Field (PEF) Equipment and its Application on Food Processing
Authors: Yang Rui Wen , Wang Jia , Jin Yan , Lin Song Yi
Published: April 2014

Due to short treatment time, the quality change of food caused by heat can be reduced, high-intensity pulsed electric field (PEF) has been widely used, especially in food industry. PEF system consists of PEF generator, treatment chamber, pump, cooling coil, container and monitoring system. The research status of PEF generator, pulses waveforms, treatment chamber and electrodes were discussed. And the application of PEF on food processing was summarized.
Experimental Research of the Nozzles
Authors: Fershalov Juriy Yu. , Sazonov Timofey V.
Published: April 2014

The review of research methods nozzles. Describes the experimental setup for studying the nozzles. Presents a methodology of the experiment and data processing of the results.
Line Beam Shaper for Intra-Oral Scanning Device
Authors: Tsai Chung Li , Chen Chien Tsung , Hu Po Chi , Jan Chia Ming , Chen Cheng Huan
Published: April 2014

This paper describes an optical system as the line beam shaper for an intra-oral scanning device. The line beam shaper needs to provide desired beam quality, including bean length, uniformity, line width and depth of focus while maintaining compact form factor. More specifically, the proposed optical system was demonstrated to use only the on-the-shelf lens element to resolve all the optical performance issue, and to lead to a versatile solution for varied specification.
Beam Shaping Technology for High Power Diode Laser Source
Authors: Gu Yuan Yuan , Wu Guo Xing , Lu Hui , Lin Jian
Published: April 2014

Direct diode lasers have some of the most attractive features of any laser. They are very efficient, compact, wavelength versatile, low cost, and highly reliable. However, the full utilization of direct diode lasers has yet to be realized. This is mainly due their poor output beam quality. Because of this, direct diode lasers are typically used to pump other lasers such as bulk solid-state (rod and thin disk) and fiber lasers. An improvement of the wall-plug efficiency and Power density necessary can be achieved by beam shaping and beam combination such as polarization coupling. In this paper, using the beam shaping technology realize good beam quality and high wall-plug efficiency. Base on bars rated to 60 W and 57% conversion efficiency, vertically stacked arrays (twenty bars) of such configuration are demonstrated with rated to about 1200W. The beam quality of high-power high brightness 880 nm laser diode source is improved with beam shaping. Beam parameter product of 79. 3 mm mrad ×81. 2 mm mrad, electro-optical conversion efficiency of more than 45.8% and continuous output power of 1 kW are demonstrated. This laser can be directly applied to cladding, surface hardening and other fields.
Dynamics Analysis of Vertical Transferring Frame of Garbage Container
Authors: Wu Li , Zhang Jia Yuan , Guan Tian Min , Lei Lei
Published: April 2014

In order to decrease the maintain cost and simplify the operation process of the frame of garbage transferring vehicle, a new scheme of vertical transferring frame of garbage container is provided, and the unloading process of the frame is given. The prototype model of the vehicle frame in unloading process is built. The simulated curve of the displacement of the lifting hydraulic cylinder and the turning angle of frame is accord with the theoretical computed one. By running the dynamic model, the dynamic curve of the force of the lifting hydraulic cylinder, the force of the sliding hydraulic cylinder, the force of the lug on sliding frame acted to container and the force of ground acted to container are obtained, which provide basis on designing the structure of the frame.
Modeling and Simulation of Convenience Food Sorting System
Authors: Sun Xue
Published: April 2014

Sorting system is very important to logistics distribution center. This paper set convenience food sorting system for example, using AutoMod simulation software to model and simulate. Through analyzing the results of the system provided an optimized model to improve the efficiency of workers. The conclusion has important referring value to the actual operation process.
Position Sensorless Control of Brushless DC Motor
Authors: Fang Jin Xiang
Published: April 2014

According to the chattering problem in the traditional sliding mode observer of the position sensorless control of brushless DC motor, a novel quasi sliding mode observer for rotor position estimation was proposed, which took the error between the actual and estimated currents as sliding surface and tracked the actual rotor position according to the mathematical relationship of back EMF and speed of the motor. Then the sensorless control system of the brushless DC motor based on the novel sliding mode observer was designed. Simulation results showed that the novel sliding mode control method could improve the rotor position estimation accuracy and effectively suppress the chattering problem to enhance the robustness of system.
ABS Sliding Mode Variable Structure Control Based on Index Reaching Law
Authors: Xuan Sheng Yi , Song Chuan Xue , Meng Guang Wei
Published: April 2014

ABS(antilock brake system) is one of the most important active safety technology for modern vehicles which could enhance vehicle active safety. In this paper, an improved sliding mode control method based on reaching law has been proposed to solve the vibration problem in traditional sliding mode control. The ABS control strategy has been designed based on the sliding mode variable structure control. On this basis, the ABS single wheel depending on control strategy has been designed to ensure the braking stability. By hardware-in-loop simulation, the results demonstrate that ABS sliding mode variable structure control could enhance braking stability performance and improve the control effect on high friction and low friction road.
Research and Improvement of the Keep-Right-Except-to-Pass Rule
Authors: Zhang He Quan
Published: April 2014

In order to deal with the impact on traffic flow of the rule, we compare the influence factors of traffic flow (passing, etc.) into viscous resistance of fluid mechanics, and establish a traffic model based on fluid mechanics. First, in heavy and light traffic, we respectively use this model to simulate the actual segment of the road and find that when the traffic is heavy, the rule hinder the further increase in traffic. For this reason, we make further improvements to the model to obtain a fluid traffic model based on no passing and find that the improved model makes traffic flow increase significantly. Then, the improved model is applied to the light traffic, we find there are no significant changes in traffic flow .In this regard we propose a new rule: when the traffic is light, passing is allowed, but when the traffic is heavy, passing is not allowed.
Research on the Vehicles Queuing Based on Traffic Accidents
Authors: Qi Jun Xiong
Published: April 2014

In order to study the vehicles queuing under traffic accidents, we put the traffic wave analogy into fluid wave, and build traffic wave model, getting the relationship equation: vehicles queue length and the actual capacity of cross-section, accidents duration, section of the upstream traffic. According to analyzing the equation, we get: the maximum queue length increase with upstream traffic as category Index, however, inversely proportional to the actual capacity, and it is positively correlated with the duration of the accident.
Study of Chemical Control Synthesis on Aluminum Salt Flame Retardants Powders
Authors: Zhang Xu , Li Dan , Xie Hua , Zhang Zhi Liang
Published: April 2014

The aluminum salt flame retardants powders are prepared with ammonia and aluminum chloride hexahydrate by chemical precipitation method under different conditions. The effect of the reaction temperature, ammonia concentration and aluminum ion concentration on the particle diameter are systematically studied. In addition, the effects of additions on the particles diameter of aluminum salt flame retardants are also explored by adding different additions in the experiments. On the basis of the experimental results, the process conditions synthesizing the minimum particle diameters are obtained, which may provide the beneficial reference for inorganic flame retardant powders.
The Application of CFZ-Si Monocrystal Material in Photovoltaic Field
Authors: Wang Yan Jun , Zhang Xue Nan , Qiao Liu , Liu Zheng , Liu Jia , Wang Yun Feng , Shen Hao Ping
Published: April 2014

As the main substrate materials for solar cell, Czochralskisilicon (CZ-Si) has more crystal defects, higher impurities content and so on, which limit the further improvement of conversion efficiency (h). Floating zone melting silicon (FZ-Si) has excellent performance but the feed rod cost is much higher, so it is hardly used for solar cell widely. To solve this problem, we developed CFZ silicon monocrystal (CFZ-Si). First the poly was made into poly rod withΦ110~Φ130mm by CZ process and then made into CFZ-Si by FZ method. During FZ process, the resistivity is controlled by gas doping and the process is adjustable. CFZ-Si combines advantages of CZ-Si with FZ-Si. It has less crystal defects, lower impurities content especially oxygen content (<0.2 ppm) and excellent consistency of axial resistivity. Meanwhile, poly rod used has lower price and easier fabrication, so CFZ-Si cost is much lower and the further cost reduction is easy. Therefore, CFZ-Si has significant comprehensive advantages and broader prospect in the future photovoltaic field.
External Potential Dynamics Simulation of Morphological Transitions in Diblock Copolymer Melt under an Electric Field
Authors: Fan Juan Juan , Li Wei , Pan Zhen Dong , Shi Min Fei
Published: April 2014

In this study, we study morphological transitions of diblock copolymer subjected to an applied external electric field by means of external potential dynamics simulation. With this method, the lamellar and the cylindrical phase aligned along the electric field directions are presented, and the kinetic pathways of lamellae are investigated.
Effect of Hf Content on Oxidation Resistance of Single Crystal Superalloy at 1000°C
Authors: Shi Zhen Xue , Liu Shi Zhong , Han M. , Li J.R.
Published: April 2014

The specimens of single crystal superalloy DD6 with 0.10% Hf and 0.47% Hf were prepared in the directionally solidified furnace. The effect of Hf content on the isothermal oxidation resistance of the second generation single crystal superalloy DD6 was studied at 1000°Cin ambient atmosphere. Morphology of oxides was examined by SEM, and their composition was analyzed by XRD and EDS. The experimental results show that the oxidation resistance of DD6 alloy with 0.47% Hf is better than that of the alloy with 0.10% Hf. The alloy with different Hf content all obeys parabolic rate law during oxidation for 100h at 1000°C. The increase of Hf content can promote the Al2O3 formation and decreases the proportion of NiO. The oxide grain size and the thickness of the oxide layer all reduce with increasing of Hf content. The oxide scale of the alloy with different Hf content is made up of an outer NiO layer with a small amount of Co3O4, inner Al2O3 and Cr2O3 layer with a small amount of TaO2.
Numerical Analysis of the Deformation Law of Deep Foundation Pit of Subway Station by FLAC3D
Authors: Liu Ya Long
Published: April 2014

Taking the deep foundation pit engineering of a Subway Station as background. The paper introduces the projects surroundings,geological and hydrological conditions of the proposed field and the retaining structural type. According to the engineering characteristics,the project was divided into four typical operating conditions,the deformation rules of deep foundation pit at subway station in tunneling are studied with the method of FLAC3D numerical simulation,the supporting structures choose by the bored piles and interior support. The analysis of the horizontal deformation of the retaining structures, the settlement law and the influence sphere of surrounding soil. The conclusion in this paper can provides reference for the reasonable design and safety construction of deep foundation pit.
Research on Microstructure and Properties of Pure Copper Tube during Rolling Process
Authors: Guo Qing Miao , Tang Zhen Lei , Xie Guo Liang , Hu Jie , Li De Fu
Published: April 2014

The pure copper tube with strong axial orientation columnar grain and equiaxed grain respectively were rolled using a three-roller precision tube mill. Optical microscope, hardness testing machine and universal testing machine were used to investigate the microstructure and mechanical properties of the pure copper tube rolled with different deformation degrees. The results show that the pure copper tube with two kinds of microstructure can be directly rolled from the dimension of Φ68.5mm×57.9mm to Φ34.7×30.4mm by 8 passes with accumulated deformation degree nearly 80% and without intermediate annealing. With the increasing deformation degree, the primary columnar grain boundaries of the pure copper tube with columnar grain blurred gradually until completely disappeared. However, the microstructures of pure copper tube with equiaxed grain completely transformed into fibrous microstructures when the deformation degree reaches to 79.11%. The columnar grain is without transverse grain boundaries but with small-angle boundary, which is conducive to axial deformation. It is also found that with the increasing deformation degree, the tensile strength of pure copper tube increased steadily, while the elongation decreased gradually. The elongation of pure copper tube with columnar grains is higher and the microhardness is lower than that of equiaxed grains, indicating that the cold deformation properties of pure copper tube with columnar grain was more excellent.
Study of Identifying the Banded Structure of 8620 Steel Bars
Authors: Yang Chao , Min Yong An , Sun Hong Ping , Gu Tie , Fu Jin Ming
Published: April 2014

The level of ferrite/pearlite banding in gear steel can be affected significantly by cooling rates, however, different sizes own diverse bands in the same cooling rate. The lower-level degree banding was got under the faster cooling speed, whereas the higher-level degree banding under the slower cooling speed. The alloying elements segregation can be characterized in the fixed speed according to the banding. Banded segregation in a hot rolled SAE8620 gear steel was investigated by DIL805A dilatometer, OM, electron microprobe analysis(EPMA). The transformation temperature of rich solute and poor solute were calculated by JMatPro software. Meanwhile, the diffusion distance of carbon was also figured by DICTRA. Results showed that the difference of Ar3 temperatures for solute-depleted and solute-rich zones will impact the banded intensity, while the diffusion distance of carbon decrease with an increasingly of cooling rate, the banded structure relieved. The corresponding band adopted 0.2 °C/s cooling rate can characterize the first banded segregation of alloy elements.
Numerical and Experimental Investigations on SGMF of GH3044 Superalloy Tube
Authors: Wu Li Jun , Zhao Chang Cai , Dong Guo Jiang
Published: April 2014

According to the GH3044 nickel-based superalloy with high yield strength, a new approach for superalloy tube named Tube Solid Granules Medium Forming (SGMF) was present, and tube SGMF process principle and the mechanical model of solid granules were designed. The superalloy tube SGMF process was investigated numerically by using User subroutine of Abaqus software, the deforming simulations of two groups of tube products were performed separately, and the elongation rate and thickness distributions of the products were analyzed. An experimental system was designed and developed for tube SGMF, typical GH3044 superalloy tubes were deformed, good correlation was observed between the simulation results and experimental data.
Influence of Lamellar Graphite Additions on the Electro-Magnetic Properties of Carbonyl Iron
Authors: Lv Zhen Jian , Zeng Zhao Yang , Ji Xing Wei , Lu Ming
Published: April 2014

For the purpose of investigating the influence of graphite addition on the property of carbonyl iron absorber, some samples were made by mixing graphite and carbonyl iron powders. The electro-magnetic parameters were then measured and compared between samples containing different graphite mass ratio. Microstructures of these samples were observed to make sure that additions were uniformly distributed in these samples. By this way, the influence of graphite addition was systematically analyzed.
Optimizations of Flame Spraying Aluminum Thickness and Laminate Plies for Composite Lightning Protection
Authors: Liu Zhi Qiang , Yue Zhu Feng , Wang Fu Sheng , Ji Yao Yao
Published: April 2014

Anti-lightning strike protection for composite structures is catching great attention to design optimum lightning protection solution. Based on lightning direct effect, optimizations of flame spraying aluminum thickness and composite laminate plies were conducted by combining electrical-thermal analysis procedure and corresponding optimization programs. Optimized thickness was acquired for flame spraying aluminum layer. Meanwhile, non-uniform thick plies and optimized stacking angles were given for anti-lightning strike composite laminate. Comparisons were conducted to investigate changes of lightning direct effects on composite laminates fore and after optimization. Synergetic protections of flame spraying aluminum and laminate plies design were listed. The conclusions can be used as suggestions for lightning strike protection of advanced aircraft.
Static Analysis of Composite Laminate Wind Turbine with Different Lamination Methods
Authors: Cheng Tai Hong , Shen Yun De , Ren Ming , Lin Li Qu , Qu Jian Wu
Published: April 2014

The paper describes the static and vibration analysis of composite wind turbine blade with different lamination methods by using finite element method. E-glass/epoxy orthotropic material L900 and DBL800 were employed for reinforcing the structural strength of wind turbine blade. The zero degree directional lamination method, 90 degree directional lamination method and [0,±45,9s quasiisotropic lamination method were used for investigating the structural stability of composite laminate wind turbine. The bending condition and rotational speed were mainly considered in stress and deformation analysis. As shown in the results, the quasiisotropic lamination method shows the best result for modeling the fiber reinforced composite wind blade.
Preliminary Exploration of 2-Dimensional Seismic Response Analysis for Elastic Layered Model by ABAQUS
Authors: Yu Xiao Bo , Sun Rui , Li Xiao Fei
Published: April 2014

Finite element method is widely used in every field, in which ABAQUS is a typical product. For engineers and researchers, SHAKE91 is a good choice for seismic safety evaluation. For developing seismic response analysis for complicated cases, finite element method approach should be explored. An elastic layered model is built, which is calculated in SHAKE91 and ABAQUS respectively. The results of the two programs fitted well, which implies the correctness of the ABAQUS model. In the elastic model, simple boundary condition works well. In the future, more complex boundaries and dynamic constitutive models should be studied.
The Mechanical Properties and Thermodynamic Study on Polypropylene/Talc Composites
Authors: Wang Shao Hui
Published: April 2014

The composites of PP/Talc modified by stearic acid were prepared and its effect on the properties of PP/Talc composites was investigated in this paper. The tensile strength and impact strength of PP/Talc composites increased about 15% and 30% compared with pure PP respectively. Based on surface analysis by scanning electron microscope (SEM), the Talcparticles buried well in PP matrix when the Talc was coated with the stearic acid. At the same time, it was found that Talc significantly increased the crystallization temperature and crystallization rate of PP by differential scanning calorimetry (DSC).
The Reinforcing Mechanism of Recycled Glass Fibers and Milled Glass Fibers in Polypropylene Composites
Authors: Qiao Yu Hua , Miao Huai Min , Xu Yong Biao , Jiang Wei , Zheng Yan Hong , Shen Zhi Gang
Published: April 2014

A great amount of work has been done over the past few years to use the glass fibers reinforcing polypropylene (PP) composites. Due to the sharp resources recovery, and the global demand for fiber materials, there has been growing interest in the use of the recycled glass fibers (GF) (RGF) as an alternative. This work focuses on the reinforcing mechanisms of the glass fibers in PP composites. The reinforcing mechanism is evaluated by scanning electron microscopy (SEM) on the basis of the energy dissipation theory. The GF are the excellent supporting bodies. Interfacial debonding, fiber pullout and breakage dissipate tremendous energy. These factors cause improvements in the strength of the RGF/PP and MGF/PP composites.
Theory Analysis on Chloride Permeation of Unsaturated Concrete in Subsea Tunnel
Authors: Li Xiao Zhen , Zhang Yuan Zhu
Published: April 2014

Subsea tunnel develops rapidly and has a good prospect, but bad service environment, maintenance of a high degree of difficulty and cost make its durability to be a serious study issue. Owing to Darcy law and pressure change law, moisture seepage rule in unsaturated concrete is analyzed. Establish the theoretical models about the pressure head and flow rate change with the location and time, concluded that the penetration depth formula. On this basis, convection-diffusion equation of chloride under pressure is solved where an analytical solution is obtained. The above theoretical model is applied to engineering example to prove it can meet the design life.
Application of Reactive Compatibilizer in High Performance Polymer Alloy
Authors: Zhang Xue Jiao , Liu Chun Ye
Published: April 2014

It has brought an attention to compatibility, which plays a key role in the development of high performance polymer alloy. This article mainly aims to give an overview of how reactive compabilizer apply to polymer alloy,such as External Reactive Compatibilizers, Blended-Component Functionalization, compatibilization change using ionomer in blends, Compatibilization on low molecular weight compound, and outlook of development in polymer alloy technology.
Effect of Carbon Nanotubes on Mechanical Properties of Cement Composites
Authors: Li Yun Feng , Zhou Jing , Gao Lei Wen
Published: April 2014

Nanotubes exhibiting great mechanical properties are expected to produce significantly stronger and tougher cement composites. The effects of Carbon Nanotubes to cement based composites are investigated in this paper. The flexural strength and the compressive strength of the CNTs cement composites under different content of are tested and the toughness indexes are analyzed. The results show that CNTs have a positive effect on the brittle failure of cement composites, and that the compressive strength and flexural strength of 0.10% CNTs cement composites are significantly increased. The toughness index of 0.05% CNTs cement composites is relatively higher.
Effect of Fe on the Microstructure and the Thermal Storage Performances of High-Silicon Aluminum Alloy
Authors: Li Xiao Song , Cai An Hui , Zeng Ji Jie
Published: April 2014

The influence of Fe on microstructure and the expansion coefficient and thermal conductivity of Al-30 wt.% Si alloy was studied. Results show that the primary silicon morphology and size changed significantly after joining the Fe, by angular blocky primary silicon sheet or plate into small pieces and then into a polygonal large lump, edge and angle are passivated. As the content of Fe is 0.3 wt.%, material expansion coefficient and high thermal conductivity. Later, with the increase of the content of Fe, alloy point defect and line defect, surface defect and large area defect increase, the thermal conductivity of materials and inflation performance declined. When the content of Fe is 0.1 wt.%, materials with high thermal conductivity and low thermal expansion coefficient, the heat storage performance impact is minimal.