bluuebunny/crossref_metadata_2025 huggingface dataset:
An Empirical Study of the Investment to Promote the Technological Progress of China's Industrial
Authors: Wu Yan Jun , Ji Shi Dong , Jia Li Jiang
Published: January 2014

This paper using data of China's Industrial Sector in 1996 -2010, selecting the stochastic frontier production function model, estimating the rate of change of total factor productivity in various industries, gets the level of technological progress in various industries. On this basis, domestic and foreign investment in 1996 -2010 data, were used based on the panel data model to study the impact of the level of domestic and foreign investment in industrial sectors of technological progress. The empirical results show that the industrial technological progress in the vast majority of the industry comes from domestic investment or foreign investment, the individual industry even at the same time by the dual effects of domestic and foreign investment, When the industry is characterized by high degree of market competition and foreign investment to domestic investment proportion is higher, technological progress is more inclined to come from domestic investment, the contrary is more inclined to come from foreign investment.
An Portfolio Optimal Attainability under Transaction Costs
Authors: Xu Shi Meng , Liu Jun Hong
Published: January 2014

This According to discount asset function and double convex portfolio, the attainability of the asset optimization was discussed under the market models with transaction costs,. By virtue of stochastic analysis and the maximal value properties confined in some convex region, the attainability of asset optimization was given under discount function form and corresponding to utility function and expectation of utility function in this paper.
Empirical Study on the Effect of Investment on Employment
Authors: Fan Yu Ping , Fan Mao Qing
Published: January 2014

In this paper, we investigated the relationship between investment and employment in our society by using co-integration theory, and analyzed the relationship between investment and employment in 33 sectors by using panel data model. The co-integration analysis shows that there exists a long-term stable equilibrium relationship between the whole social investment growth and employment growth. The panel data model testifies that investment has the greatest effect on the employment of commercial catering industry.
Research of Two-Tuple Linguistic in Process of Maintenance on Risk Evaluation for Naval Vessel
Authors: Lu Yao , Fang Li , Gong Jun
Published: January 2014

With respect to the problems of dates losing and incomplete information, which may cause false decision in process of naval vessel maintenance, an optimized model was put forth on the basis of two-tuple linguistic theory. In the end, a reasonable conclusion is used for battle decision according to simulating.
Research on Walking Principle of a Worm Pipe Robot
Authors: Xu Feng Ping , Zhou Yan , Zhao Zhi Cong
Published: January 2014

The new type worm pipe robot was put forward based on Stewart parallel mechanism by the method which move or rest platform is alternated. The kinematical model was set up by the method of coordinate transform for the robot in this paper, and the walking principle was analyzed when the robot moved in straight pipe and elbow. Further more the virtual prototype was made and kinematical simulation analysis had been accomplished. By the walking simulation when the robot moved in straight pipe and elbow it is validated that the walking principle established for the robot is correct. The robot can has bigger tensile draw.
Development of Double-Axis Double-Rest CNC Machining Center
Authors: Wang Jie , Zhang Lin
Published: January 2014

The design for a double-axis double-rest CNC machining center is introduced by describing its key machine elements and machine tool design procedures. Then based on the theory of the multi-body system, the modeling process of the volumetric error model for the CNC machining center is expatiated and the result of the modeling is given. It is verified that the error of the machine tool is from three line error and three angular errors between structural units as well as the vertical error between axes. Finally experiments are carried out to evaluate the machining performance of this designed machine tool.
The Hammerstein Predict Model of Control Valve Based on Least Square Support Vector Machine
Authors: Huang Ai Qin , Wang Yong
Published: January 2014

Control valve is a kind of essential terminal control component controlling the parameters of fluid such as flow and pressure in process-control. However it is a complex nonlinear, multi-input and single-output (MISO) system that is hard to model by traditional methodologies. To establish the pressure model of control valve, this paper presents a Hammerstein modeling method based on the least squares support vector machines (LS-SVM). The linear model parameters and the static nonlinearity of Hammerstein model can be obtained simultaneously by solving a set of linear equations followed by the singular value decomposition (SVD). As an example, a set of actual production data from a controlling system of chlorine in the salt chemistry industry were applied. The simulation results demonstrate that the obtained LS-SVM Hammerstein model can efficiently approximate the pressure of a control valve. Furthermore, the proposed LS-SVM Hammerstein model can be used in artificial intelligent control and the default diagnosis.
Damage Mechanics-Finite Element Method for Vibrational Fatigue Life Prediction of Engineering Structures with Damping
Authors: Sun Lin Lin , Hu Wei Ping , Zhang Miao , Meng Qing Chun
Published: January 2014

This paper provides a new method which is damage mechanics to predict the fatigue life of engineering structure with damping under resonant loading. The material parameters are obtained by the results of the fatigue test of standard specimens. And based on the further development of APDL language, damage mechanics-finite element method for vibration life prediction under resonant loading is used in ANSYS. Finally, the vibrational fatigue crack initiation life of an aluminum alloy beam with damping carrying load of various frequencies is calculated. Whats more, this research provides a feasible way to predict the fatigue live of an engineering structure by means of damage mechanics.
A Study on the Output Characteristic of Photovoltaic Array under Partially Shaded Conditions
Authors: Tam Le Thi Minh , Duong Nguyen Van , Tien Nguyen Thanh , Ngu Nguyen Viet
Published: January 2014

Efficiency of Photovoltaic (PV) array is affected by surface temperature, solar irradiance, shadow and shape of the PV array. Under partially shaded conditions, the maximum power point tracking method will be hardly controlled since the output power characteristic of the PV array is complex with many spikes. In the present study, characteristics of PV array were therefore established under partially shaded conditions by using Matlab/Simulink. The output characteristics of the PV array under partially shaded conditions were calculated and analyzed. These output characteristics significantly depend on the solar irradiance, surface temperatures, cases of shadows, configurations of the PV array, and numbers of PV modules under partial shadow. The present results are good to designate a PV power generation system by using the power point tracking method.
Thermal Effect of Dual-Function Solar Collector on Building in Autumn
Authors: Luo Cheng Long , Xiong Ji Hai , Fan Min , Han Chong Wei , Sun Li Yuan
Published: January 2014

In this study, a numerical study is made on a dual-function solar collector integrated with building when it works in thermosyphon water heating mode with natural circulation. The investigation is achieved to show its thermal effect on the building environment by comparing with cooling/heating loads of the rooms with or without the novel collector for the warm autumn periods. The results show that in autumn the thermal effect of the novel system is not inevitable because the cooling load of the room with the collector has an evidently positive difference and the heating load must reduce.
Numerical and Experiment Study on New Types of Magnus Blade
Authors: Yao Ying Xue , Wang Xue Wen , Wu Jin Ming
Published: January 2014

Fossil energy is becoming less and less, as one of new energy, many countries pay more attention on wind energy. Magnus wind turbine has an advantage of simple structure, low cost. It can work well at a very low wind speed and the control system is very simple. As the cylinder blade of traditional Magnus wind turbine has a relatively low lift to drag ratio, This paper provide two new type blade of Magnus wind turbine and it can greatly improve lift to drag ratio of Magnus wind turbine. This paper will use CFD software Fluent, through 2D simulation, compare the lift to drag ratio of cylinder blades. At last, do experiments to compare the performance of these blades.
Heat Storage Performance Analysis of Solar Chimney Power Plant System
Authors: Guo Hong Jing , Li Jian Lan , Huang Shu Hong
Published: January 2014

Solar chimney power plant which can realize continuous power generation is a potential power generation technology. Based on the heat transfer theory and hydrodynamics theory, a comprehensive heat transfer and flow model of solar chimney power plant was proposed, and the characteristics of unsteady temperature field and flow field of the system were analyzed. With Manzanares solar chimney power plant as the geometric prototype, the performance of plant generation output and generation stability were studied in condition of different thickness of heat storage layer, different specific heat capacity and thermal conductivity of heat storage medium. The numerical stimulation results showed that above three factors significantly affected the power generation output and generation stability. Thus, the optimization of the three factors was achieved in this paper, which provides the basis for the solar chimney heat storage system design.
Optimization Design on the Performance of the Shaper
Authors: Dong Ji Gang
Published: January 2014

To improve the stability of the ram-movement and to make use of the power consumed during the return stroke, the author built a model in ADAMS[ to run its simulation to optimize the geometric parameters of the shaper so that a bidirectional planer is likely to be designed and applied in the industrial field, thus the producing efficiency could be increased without inventing a new kind of planer with a new mechanism, but only to change some geometric parameters of the original slider-crank mechanism.
Energy and Distribution Analysis on Engine Bench
Authors: Chang He , Yu Xiu Min , Qu Xian , Zhang Wen Chao , Sun Pin , Dong Wei
Published: January 2014

Engine is carried the test on the thermal balance test and the drag test in the vehicle working condition to analysis the distribution of energy from combustion. The heat of coolant that combustion flow into the cooling system in different temperature is not the same. The results show that the engine heat comes into the cooling system ranging minimum at 3000-4000r/min, the effective power output accounts for the total energy up to 25% at full load reaching the maximum. Based on the data, it is established the control system of engine cooling module that can be controlled by the engine speed, torque and power, when the ECU reads the signal to forecast the combustion energy flow to the cooling system in the target vehicle working conditions establish the cooling module heat release control system.
Study on a Novel Excitation Coil Used in Electromagnetic Anti-Wax Apparatus
Authors: Zhang Wei Wei , Wang Ting Ting , Zhang San Chuan
Published: January 2014

The deposition of paraffin wax during the pipeline transportation impedes the flow of crude oil and eventually blocks the pipelines. In recent years, electromagnetic paraffin control technology was increasingly utilized as an alternative energy-saving method. However, the efficiency of magnetic paraffin control is restrained by edge effects in conventional anti-wax apparatus. So, theoretical and experimental researches on novel anti-wax apparatus with step solenoid have been performed to improve the efficiency of paraffin control. The effect of geometric structure on field distribution was investigated to optimize the coil structure using finite element simulations. The effective correction of the edge effect of conventional solenoid field and the elimination of novel edge effect induced by the step field manifest the superiority of multi-step coil structure in paraffin control. Therefore, a novel apparatus with positively multi-step structure in the outlet of the excitation solenoid and negatively multi-step structure in the inlet was presented.
Study on Adaptive Distance Relay to Prevent Cascading Trips in Complex Power Grid
Authors: Gu Song Lin , Wang Zeng Ping
Published: January 2014

Cascading trips caused by flow transferring are the crucial reason for a lot of well-known blackouts. Aiming at the distance relay which is most applied in power grid, this paper puts forward an adaptive setting scheme to prevent cascading trips in complex power grid. In this paper, using two-port network model to fast calculating apparent impedance, and than calculating the apparent impedance change rate which is caused by flow transferring. According to the apparent impedance change rate modify the setting value which would contract the range of the impedance circle. After accomplishing the contraction, the relay action check will start. Through the process of modification and checking, the adaptive setting scheme which is not affected by the flow transferring will be formed. Taking the New England 10-unit 39-bus system which also used this method as the example, in this case, this method is confirmed by the BPA simulation.
X-Ray Testing of Weld Defect of Automatic Recognit Ion and Alarm Technology Research
Authors: Zhang Peng Lin , Zhao Zhi Qiang , Wang Yan Ping
Published: January 2014

This essay based on X-ray digital automatic detection as a starting point, and then to deal the typical X-ray digital image with median filtering and histogram threshold processing, with the help of a column gray method to extract respective column of each weld image gray scale curve, this essay tries to analyze the defect signal characteristics and discuss the extraction methods. In this essay, the author compiles the image preprocessing procedure, columns, gray-scale extraction procedure and defect alarm procedures; and also tries the X-ray weld defect detection of digital rapid recognition and prompt functions. Thorough the analysis we can draw the conclusion that column gray method can be used as a dynamic test basis of automatic alarm decision.
Finite Element Research on Damping of Viscoelastic Free Layer Damping Sheet
Authors: He Yuan Chao , Chen Wen Lin , Sun Shi Wei , Hao Li Na
Published: January 2014

Based on modal strain energy method, the paper discusses viscoelastic free layer damping sheet, establishes the finite element model of it and obtains the natural frequencies and loss factor. Then the paper calculates the loss factor of viscoelastic free layer damping structure with engineering empirical formula, and compares the result with that obtained by finite element method. By comparing the two results, it indicates that the finite element method is effective in analyzing this kind of problems.
Taguchi Optimization to Determine Optimal Denier of the Polyester Fibre
Authors: Wang Shu Wen , Su Te Li
Published: January 2014

Polyester fibre is the synthetic fiber made with man-made fibers. Its surface is smooth with the texture of fine linen. It has good flexibility and durability and is the best non-iron fibres. In order to promote the accuracy and reduce the quality deviation of melt spinning, the Taguchi method was adopted in the melt spinning process. The aim of the research is to enhance the optimization of the melt spinning process using the material polyester. First, the Taguchi method is applied to establish the design of experiment. An analysis of variance will be done to arrive at the significant factors that influence the melt spinning quality the most. Lastly, confirmation experiments verified the reproducibility of this experiment. Confirmed by the experiments, results showed that the obtained SN ratios were greater than the signal-to-noise ratio of nine orthogonal array experiments and this means the experiment is reliable.
Coupling Vibration of Tapered Rod
Authors: Hu Shang Wen , Li Hong Liang , Meng Yu
Published: January 2014

In rod's free vibration, its easy to obtain normal modes. However, if there is rigid body displacement, the problem will be much more complex. To solve these kinds of problems, single flexible body dynamics is needed. As the first part of the paper, considering rods rigid body displacement, the free vibration of tapered rod is discussed. By solving partial differential equation of rods free vibration, normal frequencies of tapered rod are obtained. As the second part of the paper, coupling vibration is discussed, in which process quasi-variational principle as the most important tool is used. Finally, first-order frequency of coupled vibration of rod is represented.
Pump Ability of Concrete Mixture Improvement Based on Rich Mortar Theory Testing Method
Authors: Wang Gui Ling , Ma Ming Lei , Miao Dong Mei , Ma Hong Juan
Published: January 2014

Ready-mixed concrete has gained more and more popularity in the construction projects in China. Long distance or high dislocation pump of concrete mixture is difficult to control the concrete quality , even more worse, the concrete may become drier or stocked during the pumping. How to improve the concretes pump ability is a major concern of the construction company. With the development of civil engineering, the building get much more higher and the bridge get much more longer, the pump ability of concrete matters the final product quality of the structure. This article proposed a comprehensive research on pump-ability of concrete mixture from the in field experiences by CCEED (China Construction Eighth Engineering Division).
Homogeneous in Distribution of InGaN/GaN Quantum Wells in High Performance GaN-Based Light-Emitting Devices
Authors: Kim Hyun Soo , Lee Sung Nam
Published: January 2014

We have investigated the effect of well growth rate on threshold current and slope efficiency of GaN-based laser diodes (LDs). The lasing performance was significantly dependent on optical and crystal quality of In0.08Ga0.92N/ GaN QWs with different well growth rates. The InGaN QWs grown with lower growth rate represented better interface quality and had low surface defects in the InGaN/GaN QW region. In addition, InGaN QWs grown with lower growth rate exhibited the higher optical properties such as the higher PL intensity and the smaller blueshift with increasing excitation power density. The present results suggest that optical and crystal qualities of InGaN/InGaN MQW are significantly improved by lowering well growth rate, resulting in the increase of slope efficiency and the decrease of threshold current density in GaN-based LDs.
Study of MEMS Based Micropyrotechnic Igniter
Authors: Yan Xue , Shi Chang Jun , Xiaoming Ren , Lan Liu , Xie Rui Zhen
Published: January 2014

Micro-electro-mechanical system (MEMS) have recently seen their field of application extended to military. This is mainly due to the fact that MEMS technologies present a great to reduce the mass, cost, power consumption, while improving the reliability, performance and smartness. Application of MEMS technology, the micropyrotechnic igniter are produced.The principle is based on the integration of lead styphnate (LTNR) material within a micropyrotechnic igniter, which is produced by MEMS with 3 by 3 micro-igniter. Each igniter contains three parts (the igniter chip, silicon chamber, lead styphnate). One import point is the optimization of the igniter process obtaining Ni-Cr bridges with about 13Ω, which is triggered by electrical power delivered to LTNR. The resistance of Ni-Cr bridges is used to sense the temperature on the LTNR which is in contact. The other one point is the optimization of silicon chamber process obtaining incorporate configuration of micropyrotechnic igniter. The ignition performance of micropyrotechnic igniter array are tested with ignition voltage less than 13V. The experimental results will deeply contribute to the micropyrotechnic system. This paper will discuss all these point.
The Study of Oxymatrine on Apoptosis of Human Carcinoma Cell Line MGC-803 by Flow Cytometry
Authors: Zhu Yan Qin , Zheng Nan Nan , Tang Lu , Li Xi Feng
Published: January 2014

Objective:To study the effect of oxymatrine on apoptosis of human carcinoma cell line MGC-803. Methods:Flow cytometry were conducted to investigate apoptosis rate and expression of Bcl-2 and Bax protein. Results: At the dose of oxymatrine were 1mg/ml,2mg/ml,the apoptosis rates in MGC-803 were higher than those of controls (p<0.05), the expression of Bcl-2 was decreased and Bax was increased significantly (p<0.05).Conclusion:Oxymatrine induces apoptosis in human carcinoma cell line MGC-803, its mechanism includes up-regulated expression of Bax and down-regulated expression of Bcl-2.
Mungongo Seeds Oil (Schinziophyton rautanenii) as a Potential Source of Bio-Diesel
Authors: Kivevele Thomas , Huan Zhongie
Published: January 2014

Biodiesel from mungongo seeds oil (Schinziophyton rautanenii) was investigated in the present study to determine its suitability for use as substitute of petro diesel. The fuel properties of Mungongo Oil Methyl ester (MOME) such as cetane number, kinematic viscosity, oxidative stability, lubricity, cloud point, pour point, cold filter plugging point, flash point, acid value, density, higher heating value, free and total glycerol were determined and compared with global biodiesel standards such as ASTM 6751 and EN 14214. Most of the determined fuel related properties of MOME fulfilled the minimum requirements of ASTM D6751 and EN 14214 biodiesel standards except oxidation stability. The stability of biodiesel is very critical and biodiesel requires antioxidant to meet storage requirements and to ensure fuel quality at all points along the distribution chain. Therefore, three antioxidants; 1, 2, 3 tri-hydroxy benzene (Pyrogallol, PY), 3, 4, 5-tri hydroxy benzoic acid (Propyl Gallate, PG) and 2-tert butyl-4-methoxy phenol (Butylated Hydroxyanisole, BHA) were investigated. The result showed that, PY and PG were more effective antioxidants than BHA.
Antioxidant Activities of Ethanol Extracts from Zanthoxylum avicennae
Authors: Li Xi Feng , Zheng Nan Nan , Tang Lu , Zhang Wei Xiao , Wang You Xu , An Shuo , Zhu Yan Qin
Published: January 2014

The Zanthoxylum avicennae 95% EtoH extracts after concentration were dissolved in H2O and extracted with EtoAc and n-BuOH Successively. The n-BuOH layer was added to Diaion HP-20 macroporous resin column, then the resin was washed by distilled water to get rid of impurity, then washed by 20%, 40% and 60% methanol individually, and obtained M20, M40 and M60 respectively. And antioxidant activity was assessed using three methods: DPPH radical-scavenging activity, ABTS+ radical-scavenging activity, ferric reducing antioxidant power (FRAP) assay. The results indicate that TEAC value of M40 were higher than other part extracted from Zanthoxylum avicennae 95% EtoH extracts during three methods .The results of the experiments also can find M40 is the strongest antioxidant activity part in Zanthoxylum avicennae 95% EtoH extracts and provide reference for further isolating the part M40.
Adsorption of Polyvinyl Acetate (PVAc) Adhesive Emulsion from Aqueous Solution by Lignin-Phenol Based Cationic Surfactant Modified Organic Kieselguhr
Authors: Mao Cui Ping , Wu Shu Bin
Published: January 2014

The kieselguhr was modified by the lignin-based cationic surfactant which obtained from the Mannich reaction. Modified organic kieselguhr exhibited favorable adsorption to adhesive and fine colloidal substance. Dissolved and colloidal substances (DCS) appeared in the secondary fibre reuse process interfered the pulping and papermaking seriously. The organic clay could remove the stickies substances through adsorption approach technically. In this paper, PVAc was chosen as the simulacrum of stickies because of its wide application as the adhesives in wood, textile, paint, paper processing and other industries. The organic kieselguhr was characterized by scanning electron microscope (SEM) and infrared spectrum (IR), etc. Then the adsorption experiment of PVAc emulsion from aqueous solution was carried out. 78.61% of the adhesive was absorbed by the organic kieselguhr, while the untreated clay only removed 53.41%. Common cationic surfactant, such as dodecyl trimethyl ammonium bromide (DTAB) and cetyl trimethyl ammonium bromide (CTAB), the modified clays were taken as the reference substance. The results indicated that the modified organic kieselguhr had well absorption efficacy to the stickies simulacrum, which provided a novel approach for the stickies controlling.
Emission Reduction Potential Optimization Model on Refinery and Chemical Enterprises for Atmospheric Pollutants Total Amount Control
Authors: Li Xing Chun , Wen Jing Ya , Long Jiang , Du Xian Yuan , Li Yu
Published: January 2014

Aiming at the harsh environmental situation at present, refinery and chemical enterprises in China are mostly of high energy consumption and high pollution enterprises, which have great emission reduction potential of atmospheric pollutants. Based on SO2 and NOx produced by refinery and chemical enterprises, the emission reduction potential optimization model is established by using linear programming method, and combined environmental management policy about total amount control of atmospheric pollutants. Through the model results, the maximum pollutant emission reduction of SO2 and NOx predicted through the model were 4810.69 and 1574.04 (tons), and the optimum technical schemes have been given, respectively. This model could provide not only the maximum emission reduction of the existing projects and enterprises, but also the decision support of emission reduction for refinery and chemical enterprises during "the 12th Five Year Plan".
Multiple Time-Scale Collaborative Optimal Dispatch Methods for Electric Vehicles and Wind Power
Authors: Sun Yi , Huang Xue Liang , Chen Zhong , Qiang Hao , Zhang Qi Dong
Published: January 2014

Renewable energy, especially wind power has the characteristic of fluctuation. Improving its capacity integrated into grid is a difficult task. Electric vehicle which has few greenhouse gas emissions is developing rapidly. But it will be noneffective to reduce greenhouse gas emission if using traditional energy to charge electric vehicles. Taking into account the synergies between electric vehicle and wind power, the multiple time-scale optimal dispatch methods were proposed based on traditional day-ahead generation schedule. The effects of optimal dispatch on reducing abandoned wind power, leveling power plants output were studied in IEEE 24-bus system. It is concluded that with large amounts of EVs connected into grid, the multiple time-scale optimal dispatch methods for electric vehicles and wind power contribute to realizing clean charge and improving wind power utilization.
Design of a New Largemouth Bass Food Habit Domestication Device
Authors: Zhang Jin Quan , Hu Qing Song , Shen Wei Xing
Published: January 2014

Largemouth bass, as known as Cichlasomamanaguense, have many characteristics such as carnivorous, fast growth, and less disease. According to the living habit of the bass, a food habit domestication device is designed and developed. By the sound guidance system, underwater monitoring system and automatic control system, the device is able to achieve the goal of domesticating food habit by delivering the baits through the flowing water. The flowing water makes the bait looks like alive, and the water speed of feeding system is in accord with the living habit of the bass. Automatic control system can efficiently complete the work of domestication and meet the requirements of time and quality as well as decrease the labor cost obviously. The sound guidance system can change the methods of gathering the fish from the passive, inefficient way based on the "sense of hunger", to the initiative, efficient way based on "sound" to get better effect of domestication. Workers are able to adjust the feeding speed according to fish reaction collecting from the underwater monitoring system. The experiment shows the wide application potential of the valuable technique.
Research on the Portable Photoelectric Water Extractor Device from Air
Authors: Zhu Yan Tao , Lou Bao Dong , Liu Meng Xuan , Zhang Yu Quan
Published: January 2014

With the development of industrialization,water pollution is becoming more and more serious,fresh water supplying is becoming more and more inadequate.Some specialists have already researched the methods and developed new equipments which can extract water from air,but considering the large size and weight, the equipments were not convenient carry for field drinking by people.To overcome the shortcomings, the portable photoelectric water extraction device from air is studied, it consists of four parts,there are solar energy supply system, control system, refrigeration system and purification system.The device adapts the advanced method by the solar energy refrigeration to dew, it has four folding solar panels to get the energy and two shells which size could be changed along a slider and fixed by pins.Therefore, the new device has some advantages such as high refrigeration coefficient, high water intake rate, continuous operation long time without sunshine and excellent portability.
Cluster-Based Algorithm for Order Grouping Problem of Round Steel
Authors: Xu Shao Yun , Li Tie Ke , Wang Lei , Wang Bai Lin
Published: January 2014

Considering the feature of round steel enterprises with the contradiction between mass production size and the multi-variety and small-batch market demands, an order-grouping problem is studied with transportation optimization. Two objectives that to minimize the delivery destination difference and delivery date difference are presented, and an algorithm improved k-means algorithm procedure is proposed to solve the problem. In this algorithm, a method is applied to generate representative initial centers of k-means algorithm for optimization. Experiment results show that the algorithm is feasible and effective.
The EOQ Model for Hybrid Manufacturing/Remanufacturing System Considering Time-Value of Costs
Authors: Jin Qiu , Liu Shao Gang , Chen Kuan
Published: January 2014

The static EOQ (economic ordering quantity) model for manufacturing/remanufacturing hybrid system was improved from the point of view of time-value of system costs, and further considered the effect of time-value of money in inventory management of the hybrid system. A modified dynamic EOQ model based on time-value of system costs was proposed for a hybrid system. The main purpose of the dynamic EOQ model was to study how to determine optimal ordering quantity of the hybrid manufacturing/remanufacturing system. A numerical comparison analysis between the different models was given to illustrate the difference of the average cost and the optical ordering quantity. The results shown the modified EOQ model was often considered a more correct way in the hybrid manufacturing/remanufacturing system. The sensitivity analysis was also made to investigate the effects of main parameters on the modified EOQ model.
Study on Depth and Scope of the Guidance Ammunition Maintenance System
Authors: Li Tao , Xu Xin Qun , Chen Li , Li Xiao Chen
Published: January 2014

Present situation and guidance ammunition weapon equipment in maintenance system is analyzed, From the strengthening of technical knowledge the existing problems of guidance ammunition support operating system and repair depth are put forward, a complete theoretical system is established, security concept is established in perfect communication platform, a new repair system is established including overall planning of the test and support evaluation of guidance ammunition , to strengthen and improve the guidance ammunition support maintenance work.
Soft Magnetic Properties of [Fe80Ni20-O/NiZn-Ferrite]n Multilayer Thin Films for High Frequency Application
Authors: Xu Rui , Wang Lai Sen , Liu Xiao Long , Lei Meng , Luo Qing , Chen Yuan Zhi , Peng Dong Liang
Published: January 2014

In this research, a series of [Fe80Ni20-O/NiZn-ferritn multilayer thin films with different insulation layer thickness were prepared by magnetron sputtering at room temperature. The high frequency soft magnetic properties of [Fe80Ni20-O/NiZn-ferritn multilayer thin films were investigated. It was found that the in-plane magnetic anisotropy field (Hk) and saturation magnetizations (4πMs) can be adjusted by changing the insulation layer thickness, and the optimal Hk and 4πMs can be obtained as the insulation layer thickness of 2.5 nm. The adjustment of insulation layer thickness is essential to obtain low coercivity (Hc) and high permeability (μ) of the multilayer thin films. The measured resistivity (ρ) of [Fe80Ni20-O/NiZn-ferritn multilayer thin films was increased from 211 to 448 μΩcm with increasing the insulation layer thickness.
Research on Finishing Rolling Force Model for Hot Rolling Wide and Heavy Stainless Steel Clad Sheets
Authors: Rong Jin He , Hong Xiao , Xiang Geng Yong , Shui Jiang Jin
Published: January 2014

In order to effectively improve the calculation accuracy of finishing rolling force model for hot rolling wide and heavy stainless steel clad sheets, based on the E.Orowan unit pressure equilibrium differential equations and R.B.Sims unit pressure formulas, this paper divides hot-rolled composite deformation area into I, II two zones according to rolling stock jamming experiment, and then derives the finishing rolling force calculation formulas. Finally, by ANSYS/LS-DYNA thermal mechanical coupling simulation and experiment, the results show that compared with measured values, the relative error of simulated values is about 20%, the relative error of calculated values is less than 10%. Therefore, the rolling force model can accurately predict the size of rolling force and effectively improve the calculation accuracy of rolling force.
Analysis of Ageing Precipitation Behavior of an Aluminum Alloy
Authors: Liu Hong Xing , Zhang Jian Bo , Liang Qi Ming , Hu Hai Jun
Published: January 2014

The characterization of Al-Cu-Mg-Ag alloy with high Cu:Mg in the process of one-step ageing at the different temperatures has been studied by hardness, electrical conductivity test combining with transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The results show that one endothermic and three exothermic reactions are involved in the curve of DSC experiment for a sample quenched from 520°C. Four samples were aged at the different temperatures greater or less than the peak temperatures of the four reactions. Hardness and electrical conductivity change slowly with ageing time at the low temperature and change fast at the high temperature. GP zones at {100} ɑ planes are the main precipitates in the microstructure of the sample aged at 80°C. Ω and θ phases dominant the microstructure of the samples aged at 170°C, 230°C and 280°C. In addition, the size of precipitates increases fast when the sample aged at higher temperatures.
Monitoring Analysis on the Internal Action of Pile-Anchor Support System of Deep Excavation of Wangjing SOHO Plaza in Beijing
Authors: Zhou Xiao Min , Lai Zeng Fu , Boda Eric
Published: January 2014

Based on the oversize deep excavation project of Wangjing Soho in Beijing, the stress monitoring of top beam, soldier piles and anchor strand were carried out, which shows the development process of the internal force caused by spatial member interaction, reflect the differences from the mechanics principal of the traditional design method such as elastic foundation beam or equivalence beam of limit equilibrium state. Monitoring practice reveals that soldier pile were under the combination state of compression and bending, and are proved safe because of low stress; while the top coupled beam is under the combination state of tension and bending, and the tensile stress might goes to the stress limit, which has much relationship to the anchor arrangement, so the design of top beam should be regarded as one of the key control of construction safety. The tensile force of anchor strand are not easy to be hold with the tapered-type anchorage in site, the actual tested tensile force reaches 150~220KN , only the half of the design value.
Study on Properties of the Blends with Direct Coal Liquefaction Residue and Asphalt
Authors: Ji Jie , Zhao Yong Shang , Xu Shi Fa
Published: January 2014

This paper studies the properties of the blends composed of DCLR (direct coal liquefaction residue) and asphalt using two different processing methods, compares the regulation that the DCLR additive content and processing method take influence on the high-temperature properties, low-temperature properties and durability of the blends. It is found that the DCLR can improve the high-temperature properties of asphalt but degrade its low-temperature properties. The properties of blends composed of DCLR, asphalt and furfural extract oil are tested and analyzed by adding a certain amount of furfural extract oil into it, which shows that adding DCLR can improve the high-temperature properties of asphalt and reduce its low-temperature properties but can hardly cause any impact on the properties of the blends. In addition, the processing method has a direct influence on the properties of blends.
Design of Structure and its Enclosure for Subaqueous Tunnel to Cross River in Urban Highway Line
Authors: Zhou Xiao Jun , Rui Guo
Published: January 2014

This paper summarizes the design of reinforced concrete structure and its enclosure for a subaqueous tunnel used to cross a river in urban highway line. The tunnel mainly consists of open-cut section on river bank and cut-cover section under river bed. Their structure and enclosure are both illustrated in the paper according to site geology and general layout of urban highway line. The use of rotary bored pile and soil mixing wall to preserve the stability of open-cut foundation pit are summarized in the paper.
Research on the Design for Bridge Channel Buoy
Authors: Wen Zhen Fei , Ai Wan Zheng
Published: January 2014

The reference basis for channel buoy design in China at present is the inland navigation standard, but about bridge channel buoys design, there are a lot of insufficient places in the standard. The channel buoy reasonable design method is put forward in this paper according to the ship maneuvering characteristics.
Analysis on Analogue Simulation for Oscillatory Compaction Implementation in Bridge Deck Pavement
Authors: Wu Si Te , Huang Ping Ming , Wang Juan
Published: January 2014

According to the compaction mechanism of oscillatory roller, a simulation model for oscillatory compaction implementation in bridge deck pavement was constructed via ANSYS. Contrast analysis on dynamic responses to bridge structure when vibratory roller or oscillatory roller is in operation shows that dynamic response of oscillatory roller is much smaller than that of vibratory roller under approximate compaction degrees. In this way, disturbance for the bridge structure can be reduced greatly, risk of bridge deck pavement construction can be decreased, and service life of the bridge can be increased effectively.
Analysis of Factors Influence on Void Underneath at Concrete Pavement Joints
Authors: Zhao Fang Ran , Cao Jia Lin , Wang Ning
Published: January 2014

Three-dimensional finite element analysis was made on the transverse joint stress state of the concrete pavement slab with void underneath using ANSYS. The transfer effect of dowel bar was discussed with aircraft loaded in the joints. The influence rule of load transfer effect under different dowel bar spacing and dowel bar cross section dimension was compared. Based on the results of finite element analysis, this paper had carried on the experimental study on stress-transferring effect on concrete pavement joints with different location of the dowel bar. The influencing factors of pavement slab transverse joint with void underneath and the resistance of pavement damage on the joint was analyzed. Theoretical analysis showed that in order to reinforce the resistance capacity of local cavity on concrete pavement joint, the largest spacing of transverse dowel bar set shall not be more than 45cm, and the main factors influencing the resistance void ability on the joint are top reaction modulus, coefficient of cavity, the concrete elastic modulus and coefficient of transverse reinforcement.
Force Analysis for Asphalt Concrete Inclined Wall Rockfill Dam of Zhengcha Reservoir
Authors: Xie Xiang Zan
Published: January 2014

Through analyzing asphalt concrete inclined wall rockfill dam structures mechanical characteristics in construction process and operating process, this paper adopts finite element method to carry out simulation analysis for asphalt concrete inclined wall rockfill dam of Zhengcha reservoir. Deducing distribution law of the dams stress and displacement in construction process and operating process. Analysis results show that, asphalt concrete inclined wall rockfill dam of Zhengcha reservoir construction is reasonable, it meets the requirements for design.
A Method of Metro Tunnel Deformation Measurement Based on the Theory of Close Range Photogrammetry
Authors: Chen Zhen Hua , Zhao Ming
Published: January 2014

In order to solve the difficulties in the deformation measurement of subway shield tunnel structure, a non-contact measurement method of close range photogrammetry technology based on movable base is put forward. A light metal frame is designed as the movable base, which is calibrated by the electronic total station. And the case study verified the feasibility of the measurement.
The Progress and Prospects of the Research on Reinforcing RC Column with High Strength Steel Wire Mesh and High-Performance Mortar
Authors: Wang Jia Qi , Duan Min , Li Ping Shi
Published: January 2014

The high strength stainless steel wire mesh and high-performance mortar reinforcement has been gradually applied in construction, bridge reinforcement project. Study of the reinforcement at home and abroad mainly focus on research of strengthening RC beam shear, bending, and seismic performance. Although the application of RC column has already been carried out, there is also a short of basic technical an applied research for further study. After looking through a large amount of references, this article gives a summary of the present study about reinforcing RC column with the reinforcement, draws some conclusions and predicts the prospect of development.
Manufacture of Copper-Niobium High-Intensity ADI Driving/Driven Spiral Bevel Gears for Load-Carrying Trucks
Authors: Zhu Nan , Shi Chang Hai
Published: January 2014

This paper discusses utilizing Austempered Ductile Iron (ADI) to manufacture driving/driven spiral bevel gears for big-horsepower (under 350 Hp) heavy truck rear axles, which is a breakthrough in China. Through the carry out of focused research and experiments on main craft process key points of the components, and with all-round analysis to technical/quality outcome achieved, the authors have finally developed this new generation copper-niobium alloy ADI main/sub spiral bevel gear that is suitable for heavy truck (under 350 HP) rear axle uses. While being able to replace 22CrMo and 18CrMnTi alloy forged steels in use, this new gear has also achieved replacing forging & steel with casting & iron. Cutting of two main process steel-making and steel-rolling has not only raised production efficiency, but also lowered the its cost.
At current, rear axle spiral bevel gears for automobiles in China are manufactured through forging, with 40Cr18CrMnTi22CrMo as key materials; cemented quenching and tempering techniques are applied in the production process.This method is also used in manufacturing of driving/driven spiral bevel gears for trucks rear axles. Such combination of high-quality steel and forging means high material cost, complicated process, and production inefficiency.
The Effects of Generator in Leading Phase Operation on the System Voltage
Authors: Xue Min , Zheng Hui Ping , Song Shu Yong , Yang Wei Wei
Published: January 2014

In order to solve the problem of high voltage system which caused by an excess of system reactive power during the systems valleyload period,this paper described the methods of leading phase operation of generator to adjust the system voltage to the reasonable range, which is proved feasible and effective through the field test.
Analyzing Relationship between the Performance of the Fan and the Area of the Porous Thin Plate
Authors: Wang Shu Lung , Wang Yueh Hua
Published: January 2014

The purpose of this research is to study the performance of axial fanof the porous thin plate. First, the area of the holes of the porous thin plate is changed to estimate the influence of the porous thin plate on the performance of the fan. This study is conducted by simulations and experiments to find out the factors that will impact the performance of the fan. The results show that if the area rate of the porous thin plate and the fan is smaller, the difference of the simulations and experiments will become greater. When the area rate is more than 80%, the difference of the simulations and experiments will turn to be 10% lower.
The results of experiments show that the fan size and fan thickness are the two main factors that produce the influence on the porous thin plate. If the thickness of the bar of the porous thin plate is 2.0mm, the performance of the fan loss would be the smallest. As to the assembly position of the porous thin plate, unilateral assembly makes the performance of the fan better than bilateral assembly. This is in relation to the area size of the porous thin plate. Fan tray is bilateral assembled. The performance of the fan tray can be improved in the following two ways. To use the thicker fan as the static pressure is greater, or to use the fan with lower air flow as the loss will be lesser.
Simulation and Optimization of the Combustion Process of Diesel Engine
Authors: Ruan Guan Qiang , Zhang Zhen Dong , Cheng Jin Run
Published: January 2014

In order to improve the performance of the diesel engine, the original engine fuel injection advance angle is optimized, and a new advance angle of fuel injection is proposed in this paper. By numerical calculation with simulation of software FIRE, the effect of different combustion chamber structures on the cylinder pressure, temperature, accumulated heat release and the parameters such as NOx mass fraction was analyzed. From the simulation results, the optimized fuel injection advance angle had greatly improved the diesel combustion and emission performance. Finally, via experimental verification, the engine with optimized fuel injection advance angle has better dynamic performance, as well as less emission than original machine.
Design and Implementation of Automotive Transmission Shaft Abnormal Noise Control Process
Authors: Xing Tian Long , Ding Wei Ping , Yang Ming Liang , Wu Yu Dong
Published: January 2014

Study automotive transmission shaft abnormal noise control with engineering database,and improve the abnormal noise control process using experimental analysis,CAE technical analysis,sound quality and other professional knowledge. Then analyze the process,and establish the appropriate sub-database. Database management system organizes the various modules and promotes exchange of the user and the database with Human-Computer interface. On this basis it reveals the necessity of combination of engineering problems and database. Besides,it is verified that the entire process is effective relying on a miniature car.