bluuebunny/crossref_metadata_2025 huggingface dataset:
The Gearbox Fault Detection of Machine Center by Using Time Frequency Order Spectrum
Authors: Wang C.C. , Kang Y. , Chung Y.L.
Published: February 2012

Previously, for the case of fixed or steady state rotation rate, spectrum analysis can be used to extract the frequency features as the basis for the gearbox fault detection of machine center. However, the gearbox of machine center for increasingly instant speed variations mostly generate non-stationary signals, and the signal features must be averaged with analysis time which makes it difficult to identify the causes of failures. This study proposes a time frequency order spectrum method combining the short-time Fourier transform (STFT) and speed frequency order method to capture the order features of non-stationary signals. Such signal features do not change with speed, and are thus effective in identifying faults in mechanical components under non-stationary conditions. In this study, back propagation neural networks (BPNN) and time frequency order spectrum methods were used to verify faults diagnosis and obtained superior diagnosis results in non-stationary signals of gear-rotor systems in machine center.
Experimental Tests of Fuel Cell Vehicle
Authors: Ding Zhou Bo , He Li Ping , Dong Zuo Min
Published: February 2012

Fuel cell vehicle has been studied to improve emission and vehicle performance. The limitations of fuel cell vehicles, including high costs, limited accelerating competence and inadequate driving range must be improved so that they will be widely accepted by the consumer market. Better understanding on the underlying mechanisms of fuel cell vehicles and adequate optimization tools for designing their power train systems is much needed. This work focuses on the key issues through the simulating and experimental tests of fuel cell vehicle using a custom made dynamometer, a fuel cell scooter, which serve as generic, but easy to operate equipment to validate new computer models and modeling methods for fuel cell vehicles. The results support better understanding on fuel cell vehicle performance modeling. Based upon the new and validated models, design optimization is carried out for the fuel cell vehicle. The study and its results can be used in the development and evaluation of various fuel cell vehicles.
Numerical Study on Heat Transfer and Lubricant Depletion in a Heat Assisted Magnetic Recording System with Multilayer Disk Structure
Authors: Yan Zeng , Huang Xiao Yang , Zhou Wei Dong , Yu Sheng Kai
Published: February 2012

Heat transfer and lubricant depletion in a HAMR system with multilayer disk substrate are numerically simulated in this study. Cases under two types of multilayer disk substrates with different materials on the top layer as well as different laser powers are examined. The results show the significant effects of the material property and the laser power. Compared with pure glass disk substrate, larger thermal conductivity of top-layer material in the multilayer disk substrate causes faster heat conduction and thus substantial reductions in the temperature increase and lubricant depletion on the top surface. Hence it is necessary and important to incorporate the real multilayer structure in modeling heat transfer and lubricant depletion in practical HAMR systems.
Vibration Control of a Nonlinear Rotor System through Electro-Magnetic Bearings
Authors: Liu Jun , Sun Qiao
Published: February 2012

In rotating machinery, vibration resonance with large amplitude and complex pattern occurs at critical speeds due to rotor imbalance and nonlinear effects. In this paper, a vibration control method is proposed for a rotor system supported by a ball bearing and an electro-magnetic bearing. In particular, a disturbance observer combined with the current delay estimation is implemented to improve the controller's ability of compensating for system's nonlinear effects and uncertainty. As a result, the rotor vibration is suppressed to very small amplitudes in the entire operating speed range. The proposed method is validated through numerical simulations and experiments.
Based on the Pro/E Straight Moving Disc Cam Modeling and Motion Simulation
Authors: Xie Ying Xing
Published: February 2012

Through the Pro/E software, build straight moving disc cam follower motion equation of the curve, establish the cam modeling, and assemble to make the cam work simulation, revise cam outside contour profile equation, so as to improve the design of cam mechanism.
Study of Material Parameters’ Effect on Polymer Scratch Using SOM Method
Authors: Zhang Jian Wei , Jiang Han
Published: February 2012

Due to its inherited complexity, the polymer material parameters’ effect on the scratch resistance is difficult to detect. Using the scratch experimental results of a set of polypropylene (PP), the Self-Organizing Map (SOM) method, an artificial neural network algorithm, was adopted to study the effect of various material parameters on polymer scratch. Especially suitable for the analysis of high-dimensional data with nonlinear statistical relationships, SOM method helps to find out the influence of different material parameters on scratch behavior. This information can be used to estimate the possible performance of polymeric materials to certain extent without extra scratch experimental work. It also helps researchers to decide which group of properties should be paid more attention when studying the coupling effect of material parameters on polymer scratch resistance.
Improvement of the Back Taper Processing with Cycloid Rotational Indexing Machining Technique
Authors: Li Jia , Ying Xing
Published: February 2012

At present, in the cycloid rotational indexing processing back taper technique, machining requirements were achieved mainly through the method of using cycloid cluster to approach the involute, so that the processing efficiency was hindered. To solve this problem, this paper proposes an improved method that reduces the number of cycloids to enhance the processing efficiency. Firstly, the best approximating cycloid of the involute tooth profile is figured out. Then, the involute is segmented into sections, and the best approximating cycloid on each section is calculated. Each cycloid approaches the involute section to a maximum extent until completing the entire involute approximation. Finally, the simulative processing is carried out. The result demonstrates that the number of cycloids is one third of the previous and the machining time saves about 64%. This indicates that the improved method is feasible to machine back taper.
The Q Value Measurement of the Shadow Mask Surface Based on Laser Triangulation Measurement Technology
Authors: Lin Li Zhong , Cao Cheng Bing , Wang Tao , Huang Zhou
Published: February 2012

Using the triangulation method of laser non-contact measurement, the surface shape of CRT's shadow mask and the Q value was high precision measured. Measuring the mesh surface, the laser beam may be all or part through the mesh. The extraction problem of the effective measurement data was studied. Setting the threshold to filter out the invalid data and the data influenced by the mesh, it retained a small amount of valid data. Using data fitting and interpolation methods to process part of the effective data, then extracting the geometry of the mesh surface profile, the good reproducibility results was gotten. The advanced measuring equipment used in production practice was also studied.
Study on Machining Error of Globoidal Cam Profile Resulting from Rotational Deviation of Location of Part in Machining
Authors: Bu Fan Hua , Zhang Yue Ming , Shang De Guang
Published: February 2012

The profile error of a globoidal cam, resulting from rotational deviation of the location of the part in machining on a NC machine tool which has two coordinated rotational axes, is studied. A novel method of solving profile error is presented. According to this method, the minimum distance from a point on the profile actually machined to the desired profile is referred to as the profile error. Then, the mathematic model of profile error resulting from the rotational deviation of the part to be machined is built. After that, the type TC40 globoidal cam is employed as an example to solve the machining error. And the experiment of machining a globoidal cam is done. The experimental result is compared with the computed result, and they are mostly identical.
A Method to Reliability Analysis of the Aircraft’s Structural Component
Authors: Bai Wen Hua , Zuo Hong Fu , Lv De Feng
Published: February 2012

The MRBR is important to ensure the aircraft’s safety and reliability. The analysis to the structural components’ reliability is to establish the basis for its MRBR. The aviation component’s reliability obey the bathtub curve distribution, Weibull distribution, exponential distribution and a linear increasing distribution. A method of reliability analysis of structural components is proposed. According to the aircraft operating data the structural components reliability distribution is fitted. The component failure weaknesses and remedial measures can be determined according to its reliability distribution. So the perfect MRBR can be obtained. As an example the structural component slide rail is studied, which showed the slide rail reliability is the Weibull distribution and consistent with the actual running situation. So the example showed that the proposed method is reasonable. And a viable method to the development of aircraft MRBR is got.
Solid Modeling and Finite Element Analysis of Diaphragm Spring Clutch
Authors: Jin Wei Dong
Published: February 2012

Taking a kind diaphragm spring of automobile clutch as an example, a finite element analysis based on ANSYS WORKBENCH was studied and explained in this paper. Stress and strain variation of diaphragm spring was obtained by using static analysis, and each modal, frequency and amplitude was all achieved by applying modal analysis. And the results may provide a theoretical reference to improving structure design of automotive diaphragm spring clutch
A System for Interconnection of Telecommunication Cables Based on RFID
Authors: Lin Yu , Yi Jian Jun , Chen Shao Li , Gu Chun Hua
Published: February 2012

In large-scale telecommunication cables, it is not desirable for engineers to set manual tracing telecommunication cables or insert specific telecommunication cables into the corresponding wiring panel. The reason is that they are either time-consuming or unstable in accuracy. This paper introduces a cable interconnected system which is based on the RFID technology. This system enables operators to read cables connecting information with a portable RFID reader, hence obtaining relevant wiring information of the cables and connecting cables in a precise and fast way.
Risk Management and Risk Aversion Model Design for Mineral Resource Development in the West of China
Authors: An Jing Wen , Zhao Lin Feng
Published: February 2012

Based upon analysis of environmental and resource risks in development of mineral resources in the western area of China, the research has proposed five ways to avert risks in development of mineral resources from systematic perspective. Firstly, green mineral industry shall be developed to avert environmental risks. Secondly, group enterprises in the field shall be developed to avert market risks. Thirdly, technical chain shall be developed to avert resource risks. Fourthly, urban development and prospection of mineral resources shall be incorporated to avert the risk of city declining due to distinct resources. Finally, prospection of mineral resources shall be enhanced to better fight against risks.
Research on the Collective Risk of Clusters Conduction Mechanism
Authors: Guan Zhou , Yu Cheng Xi
Published: February 2012

This paper analyzes the connotation of the collective risk in industrial clusters, the conduction elements and the conduction mechanism, then build an enterprise risk conduction mechanism figure, delimits different ways of the collective risk conduction, deepening the understanding of the mechanism of risk conduction in the industrial clusters.
Study on Control Strategies of Semi-Active Air Suspension for Heavy Vehicles Based on Road-Friendliness
Authors: He Feng , Zhao Jing , Wang Hao Yu
Published: February 2012

Targeting the road-friendliness of vehicles, the paper has analyzed dynamic deformation and dynamic load of tires under different control strategies through co-simulation. A vehicle dynamics model with semi-active air suspension has been made through using Adams, and a PID controller, a fuzzy controller and a fuzzy PID controller have been set in the Matlab to adjust the damping of the suspension, with the road excitation modeled through band-limited white noise. The result shows that the fuzzy PID controller has overcome the shortcomings of the PID controller and the fuzzy controller and a better control effect has been achieved.
Numerical Simulation of MHD Rectangular Duct Flow with FCI Based on Magnetic Induction Method
Authors: Xu Tian Neng , Mao Jie , Pan Hua Chen
Published: February 2012

In dual-coolant and self-cooled blanket concepts, the magnetohydrodynamic (MHD) pressure drop is a key point that should be considered. In order to reduce the high MHD drop, it requires an understanding of the liquid metal flow in rectangular duct with FCI. In this paper, two cases that have different pressure equalization slot widths were simulated based on MHD module of FLUENT. It is found that with different widths of pressure equalization slot, velocity distribution and pressure drop changes a lot.
The Construction Process and Effectiveness of the Asset Impairment Standard System in China
Authors: Li Yin Xiang
Published: February 2012

During the past decade, criterion system of impairment of Assets has experienced a process from scratch and scattered to highly-developed in China. So far, “Accounting Standards for Enterprises No. eighth -- Asset Impairment ” has been implemented for nearly five years, and listed companies had compiled interim and annual reports during the 2007-2011 period which experienced a good condition overall. It is a significant breakthrough in the processing of accounting standards and accounting system, which constructs and consummates the system of asset impairment standard, require enterprises to reflect the value of the asset fairly and prevent inflated profits from property price foam. Introduction In recent years, the International and the domestic practice indicates that, in order to reflect the true value of the assets reliably, so as to improve the quality of accounting information, and reduce the uncertainty in decision-making, relevant accounting standards for recognition, measurement and presentation about asset impairment must be developed and implemented. During the past decade, criterion system of impairment of Assets experiences a process from scratch and scattered to highly-developed. In February 15, 2006, Ministry of Finance of the People’s Republic of China issued the "Accounting Standards for Enterprises No. eighth -- Asset Impairment" (Ministry of finance, PRC, 2006a), which regarding as the complete establishment of Chinese asset impairment standard system. Based on the experience of formulation and implement the accounting system and accounting standards, the Ministry of Finance drew some lessons from international accounting standards, and adopted the mode of “basic standard of impairment of Asset commanding other relative individual specific standards” to build asset impairment standard system, which has strong international significance.
The Improvement of the CLIQUE Algorithm Based on High Dimensional Data Cleansing
Authors: Sun Shao Peng , Hou Kai Hu , Chen Li Hua
Published: February 2012

Many data cleansing algorithms are based on the low dimensional data currently, and can't meet the requirement of accuracy that data warehouse in the enterprise processes the high dimensional data. In this paper the idea of using the CLIQUE algorithm to process the high dimensional data was adopted. Aiming at the insufficient processing precision of this algorithm, the meshing and pruning algorithm were improved by using the dynamic incremental algorithms. The result of testing data shows that this algorithm can improve the accuracy of the clustering result and can effectively judge the similar clustering and abnormal points which support the high dimensional data cleansing.
Investigation on Microstructure and Mechanical Properties of Directional Solidified DZ417G Alloy with Different Proportion of Recycling Alloy
Authors: Xiao Xuan , Gao Ci , Zhao Hai Qiang , Sheng Li Yuan , Zhou Lan Zhang
Published: February 2012

The DZ417G alloy with different proportion of recycling material was fabricated by directional solidification, and its microstructure and mechanical properties were investigated. The results show that the microstructure of the directionally solidified alloy changes little, which indicates the recycling material has little effect of on the alloy. However, the ductility of the directional solidified alloy with different proportion of recycling material changes greatly. With the increase of the recycling materials, the mechanical properties of the alloy decrease firstly and then increase a little and decrease at last. But the strength of the alloy almost has no change. The alloy with 70%recycle material has the relative better mechanical properties.
A Method to Quantify Risks of Financial Assets: An Empirical Analysis of Japanese Security Prices
Authors: Sato Aki Hiro
Published: February 2012

This study investigates unconditional distributions of daily log-returns of Japanese security prices from a comprehensive point of view. The purpose of this article is to estimate a risk distribution of stocks in terms of Value-at-Risk (VaR) in order to select low risk securities from many securities. Daily log-return time series of 1,340 Japanese companies listed on the first section of Tokyo Stock Exchange are examined during the last one decade. I develop a method to estimate VaR by both the maximum likelihood estimation procedure under a q-Gaussian assumption and analytical form of its cumulative distribution function. It is confirmed that they are fitted to q-Gaussian distributions (Student t-distributions) with Kolmogorov-Smirnov test. It is found that the complementary cumulative distribution function of VaR has a power-law tail with its characteristic exponent depending on values of the VaR percentile.
A Research on SME’s and Migrant Workers’ Behavior Choice of Industrial Injury Insurance
Authors: Wang Yan , Mei Qiang
Published: February 2012

In order to protect the occupational health and safety of migrant workers, government has developed a series of regulations, policies, and requires enterprises to pay injury insurance costs for migrant workers. Most of migrant workers concentrate in small and medium enterprises (SME’s). The intrinsic motivation that SMEs will pay the cost of industrial injury insurance for migrant workers is not strong. The migrant workers also do not want SMEs to pay the costs. Therefore, proceeding from the fundamental interests of the SMEs and migrant workers, the article is based on Evolutionary Game approach and analyzes the evolution paths of SMEs’ behaviors. The research provides the reliable theory reference for Chinese government to adjust the industrial injury insurance policy and protect the occupational health and safety of migrant workers’.
Preparation and Photocatalytic Activity of Sol-Gel Method Derived La Doped TiO2/ITO Photocatalytic Electrodes
Authors: Wang Wei Fu , Hu Cheng Ling , Chang Ming Yi , Hsieh Yung Hsu
Published: February 2012

La–doped TiO2 thin films were synthesized using TTIP, IPA , Acetic acid ,and La2¬O3 as precursors by sol-gel method and dip-coating method. The different molar raitos of La/Ti ( 0.025,0.050,0.075 and 0.100 ) were supported on ITO glass to product photocatalytic electrodes. The properties of both TiO2/ITO and La- TiO2/ITO photocatalytic electrodes were characterized by FE-SEM,BET and XRD. The FE-SEM and BET analytical results demonstrate that La-TiO2/ITO particles have uniform shape and small size (＜10nm ) compared with TiO2/ITO. Anotherway, the XRD resultes show that when more molar raitos of La/Ti the crystallites become more percent to of rutile. The La-TiO2/ITO photocatalytic electrode with molar raito 0.05 shows the best photocatalysis with mineralization rate after four hours reaction. On this condition, different Acid Yellow 17 initial concentration and UV light intensity have been research. Applied potential 2.0V would effectively increase the decolonization rate under visible light irradiation.
Microstructure and Mechanical Property of a Directional Ni-Based Superalloy during Long-Term Exposure
Authors: Xiao Xuan , Le Xu , Chao Zeng , Sheng Li Yuan , Guo Yong An , Zhou Lan Zhang
Published: February 2012

Directional Ni-based superalloy DZ483 is an advanced gas turbine blade material for heavy duty gas turbine application, which has good combination properties. The major research of this paper is studied on DZ483 alloy’s microstructural changes and mechanical property during long-term exposures in service environments. The results showed that: During thermal processing, the size and distribution of γ' phase tends to be more homogeneous in the interdendritic spaces; the γ' phase on the dendrite seem to arrange in designated directions. During long-term exposures, the amount of the γ' phase was decreasing and the foursquare γ' phases gradually became abnormal with the increasing temperature. However, tensile properties of DZ483 have not decreased obviously
The SWOT Analysis and Countermeasures Research on the Acquisition of Volvo by Geely
Authors: Liu Peng
Published: February 2012

As one of the fastest growing automotive manufacturers in China, Geely Group has acquired the Swedish brand Volvo from Ford Motors, which can be regarded as another attempt made by Chinese auto enterprises to realize internationalization. This article attempts to analyze the acquisition by means of the SWOT model and put forward some corresponding countermeasures.
The Effect of Campus Culture on the Cultivation of Ethnic High Quality Talent
Authors: Zhang Ben , Gao Yang , Liu Xiao Hong
Published: February 2012

With the nation's development and expansion , "high-quality" has become an important standard quality to judge talent. While the campus culture is part of the composition of college, powerful culture plays an important role in cultivating the talent with high quality. The influence of campus culture is extraordinarily significant especially in the process of cultivating minority of high-quality personnel in the national universities. The Third Plenary Session of our party clearly put forward that: "To adhere to the people-oriented, pursuit coordinated and sustainable development, to promote social economic and people's all-round development. Core requirements of the scientific development concept and is to adhere to the people-oriented and realize human's comprehensive development." The realization of human's comprehensive development, should improve people's material life, strengthen cultural construction, enrich people's spiritual life, and enhance the quality of people; It is basic requirements of the talents cultivation. Nowadays, culture has become an important part of comprehensive national strength. As part of the social culture, campus culture is significant in talents cultivation. China is a multi-ethnic country, but the economy of many minority areas is still backward and the school education level is low, strengthening the cultivation of talents is the key point. Some national universities have made the institute of campus culture construction and draw the relevant conclusions: "to strengthen the construction of campus culture is the need of social culture and the core need to enhance competence of the university. " This paper will expound the influence of particularity of the ethnic national college that has on the minority high-quality cultivation from the needs of talents training .
The Research of Collective Construction Land Transference Based on the Small Urban Land Development Characteristics
Authors: Bian Xiao Wen , Lu Bao Cheng , Zhao Xia
Published: February 2012

At present, the phenomenon of rural collective construction land transference widely exists in many cities, including big cities and small and medium-sized cities. Due to the small city's characteristics, the collective land transference management is easier to be ignored. But small and medium-sized cities play an important role in promoting urbanization process with Chinese characteristics. Therefore we must be cautious in dealing with collective construction land transference management of small and medium-sized cities. Most scholars in research give more attentions to big cities. They think transference should be promoted and imposing restrictions on transference is below allowing it. They also think allowing transference can effectively relieve the shortage of land supply, revitalize the land resources, and increase farmers' income, but also can solve the problems such as "small property right". But this conclusion overlooked the differences of large and medium-sized cities and small urban in land use and land resources demand characteristics. Based on small city land development characteristics, its collective construction land transference should adjust measures to local conditions
Influence of Brazing Time on Microstructure of High Temperature Brazing Diamond with Ni-Cr Alloy
Authors: Sun Bin , Meng Pu , Lu Jin Bin , Zhao Bin , Liu Jian Jun
Published: February 2012

Samples of high temperature brazing diamond with Ni-Cr alloy are prepared in protective atmosphere furnace for brazing time is 1 minute, 2 minutes, and 5 minutes. The microstructures were analyzed with Scanning electron microscope, energy dispersive spectroscopy and X-ray diffraction. The results show that there are two layers of carbides on the surface of diamond, lamellar carbide Cr3C2 and columnar carbide Cr7C3, the growth direction of Cr3C2 has a certain orientation relationship with the crystallographic plane of diamond, and Cr7C3 nucleates on the surface of Cr3C2. With the increase of brazing time, the morphology of carbide Cr3C2 turns from linear to lamellar and carbide Cr7C3 turns from granule to columnar. After brazing, chemical metallurgical combination is achieved between diamonds and brazing alloy and carbides are the primary reason for the strong bond strength.
SLAM Using Relational Trees and Semantics
Authors: Sarkar A. , Reiger R. , Roy S. , Chaterjee R. , Datta A. , Gupta J.P. , Sowmyan A.
Published: February 2012

This work attempts to develop a method for SLAM using semantics based on FastSLAM 2.0. Our approach to semantic mapping consists of segmenting images obtained from two sensors (optical and radar) aboard a UAV. We then identify landmarks within the segmented image, followed by the construction of relational trees with the landmarks; these trees are then used at consecutive time-steps of the robot’s motion for its localization as well as update of the landmarks. The term semantics has been used for region-landmarks which are validated with a look-up table (LUT) of the predefined surface type information, a superset of the robot’s actual environment. Finally, based on particle filters, the posterior density of the state of the robot is estimated and a 2-D semantics map is constructed. The methodology has been tested in a situation wherein the robot’s true environment and path have been simulated. For simulation we consider satellite images of optical and radar sensors of the robot’s environment. At different time-steps the robot’s images are cropped from these images, incorporating errors in the robot’s control information. Experiments carried out on the simulated environment have provided encouraging results.
A Variable Stiffness Vibration Isolation System Based on Magneto-Rheological Elastomer
Authors: Wang Wei , Deng Yi Min
Published: February 2012

Vibration isolation is a most widely used vibration protection method.The stiffness of vibration isolators in existing conventional type of vibration isolation system is usually of fixed value. This limits the system in exhibiting its vibration isolation effect in that, it has poor results for lower frequency vibration, especially for resonance frequency. Magneto-rheological elastomer is a new branch of Magneto-rheological materials. It’s an intelligent materials in that it’s shear modulus can be controlled by a magnetic field. It has wide application prospects in the vibration control area. This paper proposes using adjustable stiffness of magneto-rheological elastomer vibration isolation in vibration isolation system. By changing the current of vibration isolators coil to control the shear modulus of magneto-rheological elastomer, it can adjust the stiffness of the isolation system, making the system obtain wider vibration isolation frequency range. By exploying SimuLink software to analyze the vibration isolation system, it is found that such a design is effective and applicable.
PIM Driven Component-Based MES Reconfiguration
Authors: Li Ya Jie , He Wei Ping
Published: February 2012

To enable rapid response to the needs of MES reconfiguration, we introduce a component -based MES reconfiguration approach based on PIM. In this approach we get feature values by extending PIM, and use them to query reusable components that are needed to perform MES reconfiguration. By this means we can ensure system flexibility, on the other hand ensure the quality of the reconstructed system from the abstraction level of models.
Strategic Ideas on Scientific Development of Urban Transport in China
Authors: Wang Yong Sheng , Zhang Hao Zhi , Jiang Yu Lin , Wang Jiang Ping
Published: February 2012

To provide policy recommendations for deepening implementation of the national public transport priority strategy, authors analyzed the status quo of China’s urban transport, and pointed out that the deteriorating traffic environment, lack of related laws, unlimited increase of car ownership and improper management system are the main problems severely restraining sustainable development of the urban public transport. Based on research on causes of the problems, authors put forward the relevant policy recommendations, from the view points of law construction, smooth traffic projects, car use guidance and reform of administration system. These policy recommendations are quite necessary and significant to promote sound development of China’s urban public transport.
An Approach of Quality Performance Assessment Based on Cloud Model
Authors: Xu Song Jie
Published: February 2012

The criteria of GB/T 19580 are listed in form of linguistic term and its scoring system lacks of interim between adjacent grades. When the criteria are used in quality performance assessment, it will deal with large of qualitative indicators’ measurement and synthesis. The linguistic cloud model is introduced to implement the transition between qualitative criteria and quantitative measurement, and the evaluation approach of cloud center gravity is used to measure the change of multi-dimensional synthetic cloud. The degree of deviation θ is used to weigh the deflection between actual quality performance and best practice. Finally, a case is discussed to demonstrate the method proposed in this paper.
Preparation of Al-Ti-B-C Master Alloy and its Grain Refinement Effect for Pure Al
Authors: Wang Z.Q. , Wu H. , Yang Z.X. , Geng H.R.
Published: February 2012

In this paper, we successfully produced Al-Ti-B-C master alloys through adding mixtures of Ti and B4C powders into Al melt. XRD and SEM examinations suggest that only fine TiB2 and TiC particles are formed in the matrix of Al-Ti-B-C master alloy when the Ti/B4C molar ratio is 3/1, while an additional TiAl3 phase is present when the Ti/B4C molar ratio exceeds 3/1. The produced Al-Ti-B-C master alloys exhibited high grain refinement effect for pure Al. It was found that the presence of TiAl3 phase in the matrix of Al-Ti-B-C master alloy enhanced the grain refinement efficiency and the mechanism was discussed.
An Example to Solve High Embankment and Deep Soft Foundation
Authors: Pan Heng , Zhang Le
Published: February 2012

This paper describes the solution about a high embankment and deep soft foundation in a typical highway construction ,and analyzes the feasibility of program implementation.
Experimental Study of Interfacial Heat Flux and Surface Temperature by Inverse Analysis with Thermocouple (Fully Embedded) during Hot Steel Strip Rolling
Authors: Weisz-Patrault Daniel , Ehrlacher Alain , Legrand Nicolas , Labbe Nathalie , Horský Jaroslav , Luks Tomáš
Published: February 2012

Knowledge of temperature distribution in the roll is fundamental aspect in cold rolling. An inverse analytical method has been previously developed to determine interfacial heat flux and surface temperature by measuring the temperature with a thermocouple (fully embedded) at only one point inside the roll. On this basis some pilot mill tests have been performed. The temperature sensor, the calibration procedure and rolling tests at different strip rolling conditions (5%, 10%, 15% and 20%) are described. Results show a good agreement with well-known theoretical models. Moreover the CPU times of the method (around 0.05 s by cycle) enable an online control of the rolling process.
HPMIPv6: Hierarchical Proxy MIPv6 in 6LoWPAN Wireless Sensor Network
Authors: Xie Dong Liang , Hu Wei Song , Zhang Jie
Published: February 2012

Network-based mobility management protocol PMIPv6 is appropriate for for low-power characteristic 6LoWPAN Wireless Sensor Network(WSN), in which nodes is not needed to be involved into mobility management related signal interactions, which effectively reduce the energy consumption of mobile nodes. However, PMIPv6 machenism did not facilitate of 6LoWPAN feature that the nodes mobility is most of Micro-Movement. The paper presents a Hierarchical Proxy MIPv6 (HPMIPv6) which separates the management of Intra-Domain Mobility and Inter-Domain Mobility, and focuses on optimizing the process of Intra-Domain Mobility. Simulations showed that HPMIPv6 significantly increase the processing efficiency of Intra-Domain Mobility and reduce the Intra-Domain handoff delay.
Synthesis and Electrochemical Performance of LiV3O8/MWCNTs Cathode Material for Lithium-Ion Batteries
Authors: Ren Xiang Zhong , Shi Chuan , Zhang Pei Xin , Liu Jian Hong
Published: February 2012

Layered LiV3O8cathode material was prepared by sol-gel method using ethylene diamine tetra-acetic acid (EDTA) as chelon, and LiV3O8/MWCNTs composite materials were fabricated by mixing multi-walled carbon nanotubes (MWCNTs) and LiV3O8particles via ball milling technic. X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge experiments were employed to characterize the material structure, morphology and electrochemical properties respectively. The results show that the layer structure of LiV3O8did not change after doping MWCNTs, and the LiV3O8/MWCNTs composite showed excellent electrochemical performance. The initial specific discharge capacity of the 2% MWCNTs （mass percent） composites can reach 217.5 mAh/g at 0.1C discharge rate in the potential region 1.8-4.0V, and maintains a stable capacity of 224.9 mAh/g within 30 cycles. Comparing to the LiV3O8/MWCNTs, the capacity of pure LiV3O8samples can only remain 86% intetial specific capacity at the same test conditions.
The Effects of Graphite on Ceramic Coatings on LY12 Aluminium Alloys by Micro-Arc Oxidation
Authors: Gao Jing Long , Shao Zhong Cai
Published: February 2012

LY12 aluminum alloy samples were treated by micro-arc oxidation in sodium metasilicate electrolytes with graphite powder. The effects of graphite concentration on thickness, roughness, friction coefficient and phase composite of ceramic coating were investigated. The results indicated that the roughness and friction coefficient of ceramic coatings increased linearly. However, the thickness decreased adding graphite powder. XRD analyses indicated that the ceramic coatings fabricated on the surface of aluminum alloys by micro-arc oxidization were composed of graphite phase. SEM showed that the porosity of the ceramic coatings with distributing nonuniform micropore diameter were inceased with the increasing graphite concentration.
The Research on Lining Board Preparation of Mesoporous Zeolites
Authors: Ma Zhi Jun , Zhu Yi Min , Han Yue Xin , Fang Xin
Published: February 2012

In this paper, uses composite template, through the hydrothermal synthesis of mesoporous zeolite, and N2 adsorption specific surface area measurement instrument, scanning electron microscopy ( SEM ) on mesoporous zeolite pore size, morphology characterization, the crystallization pressure, crystallization temperature, crystallization time on mesoporous zeolite pore size, specific surface area, morphology of the impact. The results show that : the selection of P123 composite beer yeast as template agent, under the condition of high pressure crystallization ( control crystallization pressure 2.3MPa ), crystallization temperature of 110°C, the crystallization time is 72h, prepared by 10nm, specific surface area pore size of 400m2 / g mesoporous zeolite.
Domestic Progress in Making Magnesia from Magnesite by Heat Treatment
Authors: Wang Qian Qian , Li Xiao An , Wei De Zhou , Dai Shu Juan
Published: February 2012

Magnesia is a widely used inorganic chemical product. magnesite is an advantageous resource in China, and also an important source of magnesia. There are tree methods to making magnesia from magnesite using heat treatment. They are light burning, dead burning and melt. In recent years, domestic researches have been done on processes, product performance and process mechanism of these methods.
Experimental Study on Magnetic Roasting of Low Grade Specularite
Authors: Bai Li Mei , Liu Bo , Hao Yu , Zhang Xiao Liang , Ma Yu Xin
Published: February 2012

Along with the continuously rose of the iron ore price and the Chinese iron ore quantity demanded, Iron ore self-sufficient rate has become the bottleneck of Chinese steel industry development. In order to increase Chinese ore self-sufficiency rate, the paper study the xinjiang region low grade specularite. When the crude ore grade is 35%, the mass percent of reducing agent pulverized coal is 12%, roasting temperature is 800°C，roasting time is 50 min, milling fineness is 90% passing 0.074 mm and the magnetic induction is 84kA/m, after a low intensity magnetic separation, the iron concentrate can be got whose yield is 42.83%, grade is 62.04% and recovery is 79.26%.
Research on Improving the Classification-Gravity Concentration Technology Based on an Anshan-Type Low-Grade Hematite Ore
Authors: Cui Bao Yu , Wei De Zhou , Zhang Rui Yang , Zhang Si Yao
Published: February 2012

The beneficiation of Anshan-type low-grade hematite ores attracts more and more attention. Complicated beneficiation flow sheets are necessary to deal this type of ores. Classification-gravity concentration technology is used widely in these flow sheets because of its characteristics. In this paper, grinding characteristics and classification-gravity concentration tests were carried out based on the ore’s mineralogical characteristics. When the ground size of the ore was 75% -0.071mm, through beneficiation by the flow sheet of classification-gravity concentration-middle intensity magnetic separation discarding, a satisfactory concentrate assaying 67.58% Fe, 47.51% recovery was obtained, and the iron grade and yield of the tailings were 5.93% and 39.77% respectively. The controlling of the size distribution and the behavior of finer hematite grains is important and efficiency in beneficiation of Anshan-type hematite ores.
Advances in Research on Adsorption Characteristics of Alkylammonium in Montmorillonite Inter-Layer Space
Authors: Qiu Jun , Liu Dian Biao , Chen Ping , Lu Xian Jun
Published: February 2012

Adsorption Characteristics and controlling methods of long-chain alkyl ammonium cations in montmorillonite interlayer space are theoretic evidence of the montmorillonite/alkylammonium complexes in the process of preparation. This paper summarizes the advances in research on adsorption characteristics of alkyl ammonium in montmorillonite inter-layer space.
The Flotation Experiment Study on a High Silicon Low-Grade Magnesite in Liaoning Province
Authors: Dai Shu Juan , Li Xiao An , Yang Shu Yong , Yu Lian Tao
Published: February 2012

The main useful mineral in a magnesite ore of liaoning province is magnesite, the main gangue minerals are dolomite, pencil stone, quartz and so on. The content of MgO is 93.80%, the content of the main impurity SiO2 is 1.24%. The indexs of experiment of contents of SiO2 0.13%, content of MgO 97.17% in concentrate, yield of concentrate being 71.66% is got on the condition of fitting grind fineness and medicament by using the reverse flotation flowsheet.
CFD Modeling of the Mixing Process in a Curved Baffles Crystallizer
Authors: Qiao Chang Sheng , Chen Xiao , Lou Peng
Published: February 2012

The impact of different baffles on liquid homogenization in crystallization process were described. Compared with the flow field and velocity vectors of straight and curved baffles, it was found that the crystallizer with curved baffles can provide a more powerful driving force in the axial direction. And combined with the radial driving force provided by the disc turbine, dead zones at the bottom of blades were also eliminated. Due to its certain degree of twist, curved baffles can not only provide axial driving force, but it has broken the double circulation. Therefore, it made the flow field in crystallization reactor eventually distributed very well, eliminated the adhesion effect, and also made the axial flow in the crystallizer very significantly.
Critical Knock Diagnosis for Gasoline Engines Based on Neural Network with Wavelet Transform and Fuzzy Clustering
Authors: Yang Jian Guo , Wang Yan Yan , Lin Bo
Published: February 2012

. It is difficult to detect critical knock for a gasoline engine by the common method of knock diagnosis. In this paper, a new approach is presented to detect critical knock for gasoline engines. Based on this approach knock diagnosis consists of four steps. Firstly, discrete wavelet transform (DWT) is chosen as a pre-processor for a neural network to extract knock characteristic signals; Secondly, four characteristic factors are selected and calculated from knock characteristic signals; Thirdly, degree of memberships of the characteristic factors are calculated as the input and output of the neural network; and finally a RBF(Radial Basis Function) neural network is chosen, trained and applied to detect critical knock. Knock experiments were performed on a gasoline engine, and the application of the presented approach was studied. The results show that the presented method is practicable and can be applied to control the ignition of a gasoline engine working under critical knock which is admitted as an improved state of engine performance.
Analysis of Vehicle’s Kinetic Characteristic after Tire Blow-Out
Authors: Wang Ying Lin , Guo Kong Hui
Published: February 2012

. Tire blow-out (TBO) is very likely to trigger dangerous accidents particularly when the car operates at high speed. Usually, TBO at one of the wheels results vehicle’s yawing movement, forcing driver in panic to turn the steering-wheel abruptly as he or she does with the normal operation. Unfortunately, this tends to improperly steer the vehicle in imbalance due to serious variation of steering characteristics after TBO and causes it rollover or spinout as a consequence. Basically, this paper addresses the blown tire model (BTM) based on the UniTire model we developed and applied in CarSim to perform some simulations to study the vehicle’s kinetic behavior after TBO. Finally, the Vehicle’s steady-state steering characteristic after TBO is presented.
Coupled Heat Transfer Simulations of Air-Cooled Turbines with an Algebraic Transition Model
Authors: Wang Qiang , Guo Zhao Yuan , Feng Guo Tai
Published: February 2012

The investigation was to study the effect of laminar-turbulent transition on predicting thermal load of vane. The Abu-Ghannam and Shaw (AGS) algebraic transition model was applied in the coupled solver, HIT3D. Then the solver was employed to carry out coupled heat transfer simulations, and the test case was 5411 run of NASA0-MARKⅡ vane, a high-pressure turbine vane. The results shown that AGS model was able to predict the transition process in the boundary layer near the vane, and that the simulation with such model leads to thermal load agreeing well the measured one. Then the developed solver was applied to predict a low-pressure vane, and the results shown that CHT simulation with full turbulence model would predict higher thermal load than that with transition model.
Optimal Design of High Power Linear Permanent Magnet Synchronous Motor for Aircraft Launch
Authors: Hao Shuang Hui , Tang Zi Li , Long Rui Zheng , Hao Ming Hui
Published: February 2012

Design optimization and analysis of the high power linear permanent magnet synchronous motor for aircraft launch are presented in this paper. This motor has a decentralized stator that runs the entire length of travel. A plate with an array of permanent magnets is used as the secondary. This structure enables easier manufacture, flexible system assembling, and autonomous decentralized control employed for energy saving. The thrust and cogging force of the motor are highly affected by the motor structural parameters. The influences of these structural parameters on the thrust and cogging force are analyzed by finite element analysis method; experiment studies are carried out to support the theoretical analysis.
Impacts of Uranyl Ion on the Structure and Function of Cytochrome b5 His39Ser Mutant
Authors: Wan Dun , Liao Li Fu , Lin Ying Wu
Published: February 2012

Uranium is toxic to human body with mechanisms not fully understood. The structural and functional consequences of uranyl ions (UO22+) interacting with an axial mutant of cytochrome b5, His39Ser (cyt b5 H39S), were investigated by both spectroscopic and molecular modeling methods. Although slightly disturbs protein folding, UO22+ binding to cyt b5 H39S leads to a decrease of peroxidase activity. A uranyl binding site was further proposed in the heme-binding domain at Glu37 and Glu43. The impacts of UO22+ binding to cyt b5 H39S studied herein provide valuable insights into the toxicity mechanism of UO22+ towards membrane heme proteins.
A Numerical Study on the Temperature Field of Oscillatory Flow Reactor with Conic Ring Baffles
Authors: Wu Peng , Wu Jia , Li Wei
Published: February 2012

In published papers, the experimental researches have been carried out on heat transfer in Oscillatory Flow Reac-tors (OFRs) with annular baffles in both batch and continuous modes. It’s found that even with low net flow rates (or without net flow) the heat transfer properties of OFR can match turbu-lent pipe flow. But there’s no paper shows the micro-structure of temperature field in OFRs to illustrate the heat transfer mechan-ism. In this paper, we report our 3-dimensional numerical simu-lation results of heat transfer of OFR with novel conic ring baf-fles which is particularly suitable for liquid-solid systems. The temperature field of conic baffled OFR was obtained by using the commercial CFD package CFX11.0. It’s found that in “soft” mix-ing region the maximum temperature gradient lies approximate-ly in the middle of each cell, i.e. between the two pairs of vortices. It can be speculated that the convection caused by the intense vortex interaction leads to heat transfer essentially. When it’s global mixing, severe bias flow occurs. The temperature field becomes more chaotic and the heat convection is caused by more disordered vortex interaction.