bluuebunny/crossref_metadata_2025 huggingface dataset:
Prediction-Based Independent Task Scheduling for Heterogeneous Distributed Computing Systems
Authors: Lu You Wei , Xu Zhen Zhen , Xia Feng
Published: February 2012

Independent task scheduling algorithms in distributed computing systems deal with three main conflicting factors including load balance, task execution time and scheduling cost. In this paper, the problem of scheduling tasks arriving at a low rate and with long execution time in heterogeneous computing systems is studied, and a new scheduling algorithm based on prediction is proposed. This algorithm evaluates the utility of task scheduling based on statistics and prediction to solve the influence of heterogeneous computing systems. The experimental results reveal that the proposed algorithm adequately balances the conflicting factors, and thus performs better than some classical algorithms such as MCT and MET when the parameters are well selected.
AHP in the Evaluation of Power Enterprise Assets
Authors: Yu Cui Fang
Published: February 2012

The Power Enterprise asset valuation is usually the market price at market in the current market price down algorithm or method, as im of China's timber market, trading behavior is not very standardized, resulting in the use of market price of Evaluating the value out of Power Enterprise asset valuation, can not be objective and realistic response to the full value of Power Enterprise assets. This article will introduce AHP Power Enterprise asset valuation, the price of power species, Power Enterprise by constructing the AHP model, constructed response relationship between the various levels of indicators to determine the weight matrix to determine the lowest level of index membership, the calculation method to determine the individual materials species, the average price of a Power Enterprise assets, significantly improving the effectiveness and reliability of assessment.
A Multi-Objective Optimization Genetic Algorithm for SOPC Hardware-Software Partitioning
Authors: Yang Fu , Xin Liu , Guo Pei Yuan
Published: February 2012

Hardware-software partitioning is the key technology in hardware-software co-design; the results will determine the design of system directly. Genetic algorithm is a classical search algorithm for solving such combinatorial optimization problem. A Multi-objective genetic algorithm for hardware-software partitioning is presented in this paper. This method can give consideration to both system performance and indicators such as time, power, area and cost, and achieve multi-objective optimization in system on programmable chip (SOPC). Simulation results show that the method can solve the SOPC hardware-software partitioning problem effectively.
Industrial Monitoring Wireless Sensor Network Routing Algorithm and Simulation
Authors: Zhang Li Xin , Wang Liang
Published: February 2012

Aiming at the routing protocol in an industrial monitoring system, this paper analyzes the demand of the industrial monitoring wireless routing protocol, proposes a region adaptive routing protocol, and provides the algorithm, procedure and data structure of the route protocol in the industrial monitoring system. Simulation results show that the result of quantitative description compared energy consumption with time delay, this protocol is superior to orientation spreading, sensor protocols for information via negotiation(SPIN) and passing more energy protocols in both aspects, this algorithm can replace the all existing route protocols in the field of industrial monitoring area.
Fatigue Damage Character of Metal Rubber Material
Authors: Li Yu Ming , Bai Hong Bai , Yang Jian Chun
Published: February 2012

The damaging variable was defined firstly, mean while the fatigue character of metal rubber was discussed. Then the relationship between damaging variable and cyclic loading times had been summarized through fatigue tests. Finally observed the pattern of fracture face, cavities and flaws of the fatigue wires inner the metal rubber components with electronic scanning microscope, some technical methods of improving the wearing resistivity of metal rubber material had been brought forward.
Microstructure and Mechanical Properties of TiB2-WC-TiC-Ni Composite Tool Materials
Authors: Song Jin Peng , Huang Chuan Zhen , Zou Bin , Liu Han Lian , Wang Jun
Published: February 2012

TiB2-WC-TiC-Ni composite tool materials were fabricated using Ni as sintering additive by vacuum hot-pressing technique. The microstructure and mechanical properties of the composite were investigated. The composite was analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometry (EDS). The microstructure of TiB2-WC-30wt.%TiC-Ni composite containing fine WC grains, TiC grains and uniform TiB2grains. A lot of pores and coarse grains were found in TiB2-WC-10wt.%TiC-Ni composite. The pores, brittle phases and the coarse grains were harmful to the improvement of the mechanical properties of the composite. The good wettability and the adequate liquid not only inhibited the formation of the pores and the coarse grains, but also strengthened the interface energy among the grains. The flexural strength, fracture toughness and Vickers hardness of TiB2-WC-30wt.%TiC-Ni composite were 996.6±113.6MPa, 7.64±0.28MPa•m1/2and 23.58±0.82GPa, respectively.
Investigation into Influence of Pre-Forming Depth on Multi-Stage Hydrodynamic Deep Drawing of Thin-Wall Cups with Stepped Geometries
Authors: Zhu Yu , Wan Min , Zhou Ying Ke , Liu Qing Hai , Zheng Nan Song , Lv Zhen
Published: February 2012

Hydrodynamic deep drawing (HDD) is an effective method for manufacturing complicated and thin-walled parts. Aiming at the forming process of the stainless steel part with 0.4 mm thick and complex stepped geometries, the technology scheme of multi-stage HDD assisted by conventional deep drawing (CDD) is proposed in consideration of wrinkling and destabilization in the unsupported region of the conical wall, and finite element models are built. As a key process parameter, pre-forming depth on the quality of the parts is explored with assistance of numerical simulations and verification experiments. Furthermore, the failure modes, including wrinkling and fracture during forming process are discussed; meanwhile, the optimum pre-forming depth is realized. The results indicate that the technological method is proven to be feasible for integral forming of thin-walled parts with a large drawing ratio and stepped geometries; moreover, the parts with uniform thickness distribution and high quality are successfully formed by adopting optimum pre-forming depth.
An Algorithm of early Smoke Detection Based on Multiple Features
Authors: Jiang Ming Xin , Cai Xing Yang , Wang Hong Yu
Published: February 2012

An early smoke detection algorithm based on Codebook model and multiple features is presented in this paper. First, the foreground is obtained by using the Codebook algorithm. Second, the model of color distribution and the model of shape feathers of smoke are applied to detect the suspected smoke area in the foreground. Finally, the false alarm rate is reduced effectively by using dynamic features in the diffusion process of smoke. Experimental results show that our algorithm has good detection performance and achieves real-time requirement which is very important for real application.
Research on the Lander Stability during Lunar Rover Unloading Base on the Theory of ZMP
Authors: Li Kui , Liu Rong Qiang , Deng Zong Quan , Jiang Sheng Yuan
Published: February 2012

The function of the elevator is to help lunar rover arrive lunar surface from the top of Lander after landing. Rocker-arm elevator makes Lander overturn easily because its arm is too long. Different compress extent of the Lander leg, complicated condition of landing location, micro-gravity and unloading acceleration have great influence to the stability of Lander. The paper set the ZMP coordinate equation and the coordinate of support polygon by D-H coordinate law, and builds the rule of the stability. Example simulation result shows that the equation and the rule meet the requirement of Lander stability analysis on all different conditions.
Kinematics Modeling and Driving Spring Design of Truss Structure for Deployable Truss Antenna
Authors: Liu Rong Qiang , Tian Da Ke , Deng Zong Quan , Guo Hong Wei , Liu Zhao Jing
Published: February 2012

To design a truss structure of deployable truss antenna with 7 modules and ensure that the truss structure can be deployed successfully in space environment, kinematics equation of single module with homogeneous coordinate transformation method is built based on the structure and deployment principle of truss structure. By using dynamics software ADAMS, simulation analysis on the deployment is carried out and the driving force of single module is obtained in the ground condition. On this basis, driving spring is designed, and all the important design parameters are obtained. The analytical results show that the driving spring can meet the requirement of deployment in the ground condition. So it can be deployed in orbit (0G). This method can be taken as the theoretical basis for the design and deployment experiment of truss structure.
The Practice on Science and Technology Innovation Capability Building in Large Central Corporation of China - An Example of the State Grid Corporation of China
Authors: Zhao Gang , Chen Wu , Chang Yan
Published: February 2012

Since the "Eleventh Five-Year" plan, the State Grid Corporation of China (SGCC) improves the company’s science and technology innovation capability using UHV technology as leading strategy. This paper summarizes and describes SGCC in technology innovation investment status, technology innovation system and test systems construction, R&D management system construction and technological innovation capacity-building results.
Optimization for Mining Material Loading Based on Genetic Algorithm
Authors: Zhao Tong Bin , Liu Shan Shan , Bu Fan Wei
Published: February 2012

In order to improve management level of mining materials, optimum loading scheme is important. Based on the analysis of bulk cargo loading problem, taking carrying capacity and effective volume as constraint conditions, maximizing transport benefits as target, mathematical model on the base of optimization method is established. And genetic algorithm is introduced to case study. The result shows that genetic algorithm in solving the optimum loading scheme of mining materials has quick convergence, short term, and higher precision. The better satisfactory answer can be obtained after 100 generations. Before 600 generations optimum loading scheme can be educed. Genetic algorithm, with good adaptability and powerful search performance, is very suitable for optimization calculation of multiple constraints problem. Genetic algorithm can make full use of carrying capacity and volume in the process of bulk cargo loading transport, that promot mining enterprise’s operation efficiency. The study is useful for management work of mining material warehousing, scheduling, transportation etc.
Numerical Simulation of Salt Leaching for the Saline-Alkali Soil with Clay Interlayer I: Models Establishment and Validation
Authors: Chen Li Juan , Feng Qi , Xi Hai Yang , Zhang Xin Min
Published: February 2012

Salt-alkali-related soil degradation is a worldwide environmental problem that attracts researchers’ continuous attention for many years. In order to reclaim saline soil, slat leaching which is considered as the most direct method is always used. Models used to describe soil water and salt dynamics which are essential for establishing salt leaching theory are always absolutely necessary. In this paper, two-dimensional water flow and salt transport models were developed for researching salt transportation during leaching in a soil domain above a silo drilled throughout the clay subsoil. The corresponding boundary conditions were established and models were solved by finite difference method. Based on the experiment carried out in northwest China, the calibration and validation were realized and the result showed that the general trend of the simulated soil salt contents after leaching matched better with the observed values. The models could successfully simulate salt distribution of such leaching process and provided a reasonably good link for salt transportation research in saline-alkali soil.
Research on Concept System of Scaling-Ro-Translation Symmetry in Mechanical Product Structure
Authors: Ma Zhi Yong
Published: February 2012

Scaling-ro-translation symmetry is grouped by rotation-translation symmetry and scaling symmetry. As rotation-translation symmetry, scaling-ro-translation symmetry is widely exists in mechanical product structure and plays an important role. Referring the concept system of rotation-translation symmetry, and according to the combination types of symmetry benchmark and the variable types of scaling, the concept system of scaling-ro-translation symmetry was established. The concept system includes same benchmark and different benchmark scaling-ro-translation symmetry, component size, rotation alternations, translation alternations and complex scaling-ro-translation symmetry, and can offer theoretic foundation for further research.
Correlation between Estimation Error and Possible Region in Localization Algorithms
Authors: Yan Shi Hao , Xing Jian Ping , Wang De Qiang
Published: February 2012

Many localization algorithms in wireless sensor networks mention possible regions to increase the degree of localization precision. In this paper, we present the definite correlation between the estimation error and the possible region. The estimation error, which is the most important indictor to judge the performance of a localization algorithm, is proportional to the square root of the area of the possible region and the factor of proportionality relates to the shape of the possible region. We also propose two applications of the definite correlation, including estimation errors detection and energy conservation. The simulation results show that the definite correlation is suitable for all kinds of possible regions and it is feasible to detect estimation errors and conserve energy when we fix reasonable areas of possible regions in wireless sensor networks.
A Self-Learning Method for Cognitive Engine Based on CBR and Simulated Annealing
Authors: Liu Yi Jing , Chai Li Ya , Liu Jing Min , Li Bo Wen
Published: February 2012

The essential difference of cognitive radio from traditional radio lies in its ability to sense, learn and adapt to the environment. Recently, the research for cognitive radio has focused on the configuration problems of multi-objective optimization. However, in actual communication systems, the observable environment parameters are limited. Besides, the relationship between the system’s inputs and outputs is often complicated. Thus, Cognitive radio (CR) needs to understand and adapt to the environment through learning. To solve the problem mentioned above, a self-learning method for Cognitive radio decision engine based on CBR and Simulated Annealing is proposed. The simulation results show that the proposed method has the advantages of self-learning, multi-objective adaptation and rapid convergence.
Implementation of Lance Control in Top-Blown Copper Smelting Process Based on DCS
Authors: Ye Chen
Published: February 2012

Top-blown furnace is known to be effectively adopted in copper smelting. This paper elaborates lance control strategies in top-blown smelting process based on the real project named KUNPENG COPPER SMELTER in China. We implement lance control by using several schemes, such as auto lower, auto raise, normal raise and emergency raise; meanwhile, we propose a method of auto creep control to stabilize tip pressure of lance. Moreover, the configuration of the smelting control system based on Emerson DeltaV is introduced. The result reported clearly shows that the lance rises and falls automatically according to specific conditions, as well as the lance tip pressure is stable and creep movement is precise and responsible.
Research of Quantum Algorithm for Adaptive Active Noise Control System
Authors: Jiang Wei
Published: February 2012

Adaptive active noise control based on least mean square (LMS) algorithm is a linear adaptive filter so that it cannot obtain desired noise reduction. Quantum algorithm is combined with noise control to form quantum adaptive controller. Quantum adaptive algorithm is discussed completely and noise control system is simulated in order to analyze the effects of noise control.
Weighted Reverse Hölder Integral Inequality for the Result of p-Harmonic Type Equation
Authors: Xu Xu Juan , Liu Xiao Li
Published: February 2012

Some inequalities to harmonic equation have been proved. The harmonic equation is a particular form of harmonic type system only when .In this paper, we will prove local result weighted reverse integral inequality for p-harmonic type tensors by using the generalized Holder inequality and the properties of the weight. Using the local result and the properties of averaging domains, we obtain global Weighted reverse integral inequality
Preparation of Small Crystalline ZSM-5 and its Application in Conversion of Methanol to Aromatic
Authors: Song Jian Jun , Di Zuo Xing , Yang Cheng , Wu Jin Hu
Published: February 2012

Small crystalline ZSM-5 was synthesized by a hydrothermal synthesis procedure and was characterized by XRD, SEM and N2-absorption. The results show that small crystalline ZSM-5 particles grow into larger agglomerates with a diameter of 100-400 nm, resulting in mesopore and higher surface area. During conversion of methanol to aromatics, small crystalline ZSM-5 catalyst performances better than micron-size ZSM-5 catalyst in aromatic selectivity and lifetime. The aromatic selectivity could reach to 21.7%, and the small crystalline ZSM-5 catalyst shows no deactivation during first 24h.
Multipath Reduction of Shaft Tower Monitoring with GPS in Mine
Authors: Zhang Ya Ming , Shi Hao Shan , Liu Yan , Liu Chao
Published: February 2012

Safe shaft tower operation is an important guarantee for mine production. It’s necessary for monitoring to develop more effective techniques because the traditional measurements are inadequate for the purpose. For this reason, GPS kinematic positioning (RTK) technique was presented to accomplish the task, meanwhile, the main error sources (multipath error) was systematically analyzed. In addition, the Empirical Mode Decomposition (EMD)-Wavelet model was proposed for extracting multipath model. To eliminate the systematic errors, the EMD decomposes the time series to high-frequency part and low-frequency part with the standards of scale selection, which is given in terms of the mean of the accumulated standardized modes, and the tendency of high-frequency part is extracted by Wavelet. Then low-frequency part and the tendency of high-frequency are reconstructed based on EMD theory and the systematic errors mitigation model is demonstrated as well. The scheme of the multipath error reduction based on the EMD-Wavelet is suggested. The experiment shows that the proposed scheme dramatically improves the precision of dynamic coordinate series about 40-70% after multipath error mitigation.
A Novel Gaussian Window Approach for Empirical Mode Decomposition
Authors: Wu Shuen De , Wu Chiu Wen , Liu Cha Lin , Huang Yan Hao , Lee Kung Yen
Published: February 2012

Empirical mode decomposition (EMD) is an algorithmic construction for decomposing multi-component signals into a series of intrinsic mode functions (IMFs). However, traditional EMD may encounter the difficulty of mode mixing when a signal contains intermittency. To solve the difficulty, a Gaussian window averaging method is proposed to construct the mean envelope of a given signal in each sifting process. The numerical analysis also demonstrates promising reliability with the proposed algorithm.
FEA Analysis on 600MPa TRIP Steel Variable Section Roll Forming with Protrusion and Hole
Authors: Peng Wen Fang , Li Qiang , Yan Yu
Published: February 2012

Trip steel is broadly used in automobile manufacturing with its high strength and enhanced formability. For the variable section parts with protrusion and hole, roll forming is a kind of feasible way to realize continuous parts manufacturing, In the paper, with deep understanding of roll forming process and reasonable simplification, the FEM model of a multi-step variable section roll forming of 600MPa trip steel parts with protrusion and hole is established to analyze the mechanics and the deformation characteristics of the forming procedure. Equivalent stress, equivalent strain, sheet thickness and springback amount are extracted from the simulation result and studied comparatively, which is of great importance to understand the appearance of the forming defects. In addition, the forming load and torque of the rollers can also be obtained to guide the design of the variable section roll forming product line.
Ethanol Steam Reforming over La2O2CO3 Supported Ni-Ru Bimetallic Catalysts
Authors: Shi Qiu Jie , Li Bin , Chen Wei Qing , Liu Cheng Wei , Huang Bi Wu
Published: February 2012

A series of Ni-Ru bimetallic catalysts over La2O2CO3 are prepared by an impregnation method. The catalytic properties are evaluated in ethanol steam reforming reaction from 350 to 700 °C under atmospheric pressure. Ni-Ru/La2O2CO3 containing 6 wt% Ni and 3 wt% Ru is found to be more efficient, and Ni-La composite oxide could be formed in the catalyst. Ru is more active in the ethanol dehydration reaction to form ethylene than Ni. The presence of Ru could improve the selectivity for hydrogen of Ni catalyst. TG results reveal that Ni-Ru/La2O2CO3 has excellent resistance to carbon deposition.
Effect of Aluminide Coating on Rapture Behavior of Ni-Based Superalloy GTD-111 in High Temperature
Authors: Taheri Morteza , Salemi Golezani Ali , Shirvani Korosh
Published: February 2012

GTD-111 superalloys are of the newest Ni-based superalloys which because of having good stability and strength in high temperatures are used in manufacturing of hot-gas-path parts of the gas turbines. Because of severe working conditions, application of these superalloys without coating isn't recommended. For this purpose, firstly the superalloy is coated and then is used. In this paper, the effect of Aluminide coating on rapture behavior of the GTD-111 superalloy is investigated. For this purpose, a number of samples made from GTD-111 superalloy have been coated by powder cementation method and have been subjected to rapture test and have been compared to uncoated samples. The results suggest that the presence of coating causes increase of Al content in the surface and contributes in stability of γ´ which is the most important factor of superalloy strength and also causes more life cycle of this superalloy with respect to similar uncoated samples.
Study of an Inorganic Ion Exchanger Li2TiO3
Authors: Li Heng
Published: February 2012

New complex inorganic ion exchanger Li2TiO3 was synthesized. The ion exchange behavior of Li2TiO3 has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li+ in 0.1mol /L HNO3 solution is 10.1mmol/g.
Preparation and Characterization of Fibrous Hydroxyapatite/Chitosan Nanocomposites with High Hydroxyapatite Dosage
Authors: Zhang Cai Yun , Peng Dai Yin , Lu Chuan Hua , Wang Xian Ping , Fang Qian Feng
Published: February 2012

In this paper the hydroxyapatite fibers reinforced chitosan nanocomposites with high hydroxyapatite dosage (70~90 wt%) were synthesized by in-situ hybridization. The semi-permeable membrane was used to control the process of hybridization and morphology of hydroxyapatite. The compositional and morphological properties of nanocomposites were investigated by FTIR spectroscopy, X-ray diffraction, and transmission electron microscopy. The results showed that the hydroxyapatite were carbonated nanometer crystalline fibers with high aspect ratio (about 25) and dispersed uniformly in the nanocomposites. The high-resolution image indicated that the growth of nano-hydroxyapatite crystallites in the chitosan matrix preferred in the c-axis. The mechanical properties of these nanocomposites were enhanced dramatically and the compressive strength increases almost to 170MPa when the hydroxyapatite content is 70 wt%. The in vitro tests indicated that the composites have high bioactivity and degradation. These properties illustrated the potential application of this kind of nanocomposites for bone tissue engineering.
Modern Architecture in the 21st Century
Authors: Niroumand Hamed , Zain M.F.M. , Jamil Maslina
Published: February 2012

This paper presents the modern architecture in the current century. Modern architecture is a new architectural style that emerged in many countries in the decade after World War I. It was based on the “rational” use of modern materials, the principles of functionalist planning, and the rejection of historical precedent and ornament. Modern architecture was adopted by many influential architects and an architectural educator, gained popularity after the Second World War, and continues as a dominant architectural style for institutional and corporate buildings in the 21st century. According to this research, The Modern movement also referred to controversially as a style by some bound morality, technology and art together. Morality in that there was an aim to improve humanity's lot, notably whole scale demolition of slums to make way for clean modern housing. This paper presents the role of modernism in architecture. In this paper has been shown the influence of modernism in humanity and countries.
Study on Curing Kinetics of a Novel Epoxy Resin System for Hot-Melt Prepreg
Authors: Li Quan Zhou , Wu Xiao Qing
Published: February 2012

The curing kinetics of the novel epoxy system for hot-melt prepreg was investigated using nonisothermal differential scanning calorimetry (DSC), and determined by Kissinger, Ozawa and Crane methods in this paper. The results showed that the value of Ti, Tp, and Tf were 446.5K, 454.7K, 491.4K, respectively. Furthermore the value of Ea1 and Ea2 determined by Kissinger and Ozawa method, respectively, were approximate, and the mean value of activation energy (Ea) is 139.31 KJ/mol. The value 0.9488 of curing reaction order n indicated that the curing reaction was complex reaction.
Study on the Thermal Conductivity Model of Cement-Based Materials by a New Test Method
Authors: Wei Zhen Zhong , Shen De Jian , Jia De Qing
Published: February 2012

Thermal conductivity prediction models of cement-based materials are inconsistent. In order to get the correct model, parallel hot wire method is used to measure the thermal conductivity of aggregate, cement paste, mortar and cement-based materials. Theoretical analysis values and experimental values of thermal conductivity of cement-based materials are compared to get the correct series-parallel model of the material. Through further research, the test results that the influence of aggregate location and aggregate size on the thermal conductivity of cement-based materials can be ignored in the case of the same aggregate content.
Modeling of Giant Magnetostrictive Material Based on Multivariate Statistical Analysis
Authors: Zhu Xue Jun , Zhu Zhi Wen
Published: February 2012

In this paper, a kind of giant magnetostrictive material (GMM) model based on hysteretic nonlinear theory was developed. Van de Pol nonlinear difference item was introduced to interpret the hysteresis phenomenon of the strain-magnetic field intensity (MFI) curve of GMM. The coupling relationship between MFI and frequency was obtained in partial least-square regression method to describe the driftage phenomenon of the strain-MFI curves of GMM in different frequencies. Based on above, the final relationship among strain, MFI and frequency was set up. The result of significance test shows that the effects of all of the items in the final model are remarkable, and that of forecast test shows that the model can describe the characteristics of GMA in different frequencies well. The new GMM model broadens the region of controlling frequency, and is easy to be analyzed in theory, which is helpful to vibration control.
The Binding Face Mechanics Analysis of Multi-Scale Modeling for Artificial Bone Implants
Authors: Li Hu , Qin Xin Jun , Yang Jian Yu , Wang Wan Shan
Published: February 2012

With a new kind multi-scale modeling idea for artificial bone implant, the mechanics analysis steps and method were done for further surgical and recover. The multi-scale bone model was built up from CT datum, with which the whole bone stress distribution was simulated by using ANSYS software. The second analysis focuses on the micro structure with the former analysis results. Through compute iteration, the final results can be gotten where the interface stress came to be same. The stress distribution in multi-scale model isn’t same with the normal model, where less stress concentration appears in the computer simulation and the result is better for the surgical recover.
Research on the Strategies of Green Building Materials
Authors: Sun Ke Zhen
Published: February 2012

The paper discusses the strategies of green building materials, the personal safety problems and ecological materials, the appropriate and reliable technology, effective planning and design, interdisciplinary working and integrated collaboration in research on green building materials. In addition to these, the article studies the main categories of green building materials, including ecological safety materials, low-carbon materials, and recycled-content materials. This article also argues the strategy of earthquake resistant materials and structural strategy, the role of seismic designs in ecological safety strategies, reliable technology and conceptual design of earthquake engineering, etc.
Observation of Wear in Induction-Heat-Treated Bearing Steel Bars under Reciprocating Motion
Authors: Koga Masatoshi , Santos Edson Costa , Honda Takashi , Kida Katsuyuki , Shibukawa Takuya
Published: February 2012

Due to its high hardness and wear resistance under rolling contact, AISI E52100 steel (JIS SUJ2) is used in the manufacture of bearings and linear guides. The life estimation methods for components working under rolling contact developed up to now were designed for bearings. In this study, fatigue testing under reciprocating motion was performed and based on the microstructure, wear track investigation as well as hardness and retained austenite measurements, an evaluation method for linear guides is proposed. The results obtained from three different areas of the sample including wear tracks and non-damaged area are as follows: (1) there was little microstructure difference between the center and the end of the wear track; (2) a clear difference of the retained austenite content at the wear track and at the non-damaged area could be observed, however the percentage within different areas inside the track was similar.
Photoelectrocatalytic Properties of Porous TiO2 Films Prepared Using ODA as Template
Authors: Zhang Wen Jie , Li Qian , He Hong Bo
Published: February 2012

The functions of applied potential to the photoelectrocatalytic degradation process of methyl orange were investigated. When using 0.05 M NaCl and under different applied potentials, the degradation rate increased obviously with increasing applied potential. When the applied potential was between 0.6 V-1.0 V, the degradation rate was enhanced drastically. The detected current values got larger as the applied potential increased from 0 up to 1.2 V. There was no direct electro-degradation to the dye in the solution. The applied potential and the irradiated light had synergetic effect when they were applied to the solution at the same time. While after irradiation for 0 to 60 min, with the increasing reaction time, methyl orange absorption peak intensity shrank obviously. The azo and benzene groups in methyl orange degraded totally under photocatalytic process.
A Cluster-Analysis of the Employment Structure Deviation for the 11 Cities in Zhejiang Province
Authors: Tan Lan
Published: February 2012

The paper uses data in 2010 for 11 cities of Zhejiang. Cluster analysis of SPSS is used to analyze the employment structure deviation for the 11 cities. The results show that the degree of employment structure deviation is different for different regions. Since the deviation may cause adverse effect on economic growth in the long run, government should fully consider the regional difference, and work out measures to suit local conditions, so as to improve the effect of policies to lower down the deviation.
Stresses in Teeth and Overlying Crowns
Authors: Sandu Liliana , Topală Florin , Porojan Sorin
Published: February 2012

A complete cast crown allows the operator to modify axial tooth contour. The margin should be smooth and distinct and its width has to allow adequate bulk of metal at the margin. The objective of this study was to evaluate, by finite element analysis, the influence of different degree of taper and marginal designs for cast crown preparations, on the stress distribution in teeth and crowns. As experimental model an upper first molar was used. The geometry of the intact tooth were obtained by 3D scanning. The tooth preparations and the complete cast crowns were designed. Models were exported in a finite element analysis software for structural simulations. Von Mises equivalent stresses were calculated and their distribution was plotted graphically. Numerical simulations provide a biomechanical explanation for stress distribution in prepared teeth and overlying crowns.
Intelligent Surveillance and Image Transmission Based on Wireless Video Sensor Network
Authors: Yu Cheng Bo , Liu Yu Xuan , Zhang Yi Meng , Li Hong Bing
Published: February 2012

Design and implement an energy-efficient smart camera mote architecture to be used as surveillance device for assisted living. Add the Passive Infrared Sensor (PIR) to WVSN, PIR detect the human or animal’s moving, then it triggers the camera to wake up. The image captured will be grayscale processing by the central processing unit. Camera sensor nodes transmit a grayscale image over wireless channel to master control station. It offers reduced complexity, response time, and power consumption over conventional solutions. By experimental results from the test illustrate that performance of the designed wireless image sensor is better than the exiting ones in the market in terms of received signal strength intensity (RSSI) and packet rate ratio (PRR) with respect to the distance. This scheme is less complicated than other wireless video sensor surveillance techniques, allowing resource-constrained video sensors to operate more reliably and longer.
Mobility Performance Analysis under Different SCell Measurement Periods in the LTE-A System with Carrier Aggregation
Authors: Zhang Yu Xiang , Xiao Deng Kun , Jing Xiao Jun , Sun Song Lin
Published: February 2012

In order to achieve up to 1 Gb/s peak data rate in future International Telecommunications Advanced mobile systems, carrier aggregation technology is introduced by the 3GPP to support very-high-data-rate transmissions over wide frequency bandwidths (e.g., up to 100 MHz) in its new LTE-Advanced standards. In this paper, two carriers are considered, namely primary component carrier (PCell) and secondary component carrier (SCell). Appropriately loosening SCell measurement period is able to save UE power consumption without apparent effect on the system performance. This paper analyzes system mobility performances under various SCell measurement periods. Furthermore, it gives the least length a SCell measurement period could be relaxed to while still retaining the system performance in scenario 2.
Research on Adaptive Advance System of Hydraulic Support Based on Neural Network PID
Authors: Zhou Guang Xin , Li Wei , Zhang Li Ping
Published: February 2012

Aiming at the problem that contact advance lags seriously and automatic advance with shearer is not in time in ASQ of hydraulic support on fully mechanized coal mining face, this paper proposed a solution of adaptive advance system based on Neural Network PID. This advance method can effectively reduce invalid waiting time in advance and the probability that friction between top beam and roof increases, and thus to improve advancing velocity and achieve continuity of coal mining automation. This paper finally used SIMULINK to carry out simulation. Results show that Neural Network PID controller has better performance than conventional PID controller.
Research on Rough Set Applied in the Geological Measure Data Prediction Model
Authors: Luo Zheng Shan , Wei Ya Ting
Published: February 2012

Mine geological factors involved in measuring systems are very complex, large amount of data and attribute more. In actual measurement, due to the precision of measuring instruments and measurement operations personnel and other reasons, the data is inevitably flawed, and then has the subsequent impact of the design, production and management. With intelligent technology and development of computer science, mine has an increasingly high demand of geologic measure data and there are more and more methods to deal with the data. In this paper, rough set theory is applied by analyzing the characteristics of geological measure data and the structure of the database, the corresponding model is established, the uncertainty is found from the database of knowledge and abnormal data, and geological measure dataand the noise in the process of knowledge discovery interference is eliminated. As rough set method is easy to execute in parallel, without any prior knowledge of data and automatically select the appropriate set of attributes, can greatly improve the efficiency of knowledge discovery, get rid of excess property, reduce error rates, then has more advantages in processing the mass of the geological measure data and mining a more realistic data than fuzzy sets and neural network method. In addition, it is easier to be proven and tested in the resulting decision rules and reasoning processes than the latter neural network method are, and the results obtained is more easily evaluated and interpreted. Thus, using rough sets to mine the geologic measure data and find the knowledge hidden in the data, and then make the forecast analysis and decision-support for mine production and management, which is more practical.
Slag Thickness in Continuous Casting Tundish Measuring Method Based on Temperature Information
Authors: Liu Jun , Yang Feng , Xie Jun , Zeng Zheng Jun
Published: February 2012

Acquiring the thickness of slag layer in continuous casting tundish accurately is beneficial to continous casting stably, and improves enterprise benefit. A new method to measure the thickness of slag layer in continuous casting tundish, based on temperature information is put forward in the papers. A measuring bar, made of Refractory Material, was inserted into the tundish to perceive the temperature. Then the thickness of slag layer may be obtained accurately by temperature interface between air layer and slag layer, and slag layer and molten steel layer. After applying to the slag layer thickness measurement in steel metallurgy field, it has a favorable application prospects because of the measuring error about less than 2.6mm.
A Systolic Bit-Parallel Multiplier with Flexible Latency and Complexity over GF(2m) Using Polynomial Basis
Authors: Zhang Jing Xian , Song Zheng , Hu Qing Sheng
Published: February 2012

This paper presents a systolic bit-parallel multiplier with flexible latency and complexity over GF(2m) using polynomial basis. Via the employment of shift register array and pipeline strategy, the multiplier designed in this paper is able to work pipelining parallel with smaller critical path. A cell which could reach the function of reducing the input operand’s degree by one and add the results of different degrees together is created in this paper. The systolic bit-parallel multiplier can be made of several such cells. Several multipliers which have different latencies and complexities with pipeline strategy are created with further discuss, the comprehensive performances of these designs are estimated with the parameter of area-time. At the end of the page, we compare the systolic bit-parallel multiplier of this paper with a certain number of typical designs these years, the result shows that the design in this paper obtains a comprehensive performance improvement by 70%, 27% and 31%.
The Visual Simulation of Air-to-Surface Missile Bearing-Only Attack
Authors: Liang Jie , Xie Xiao Fang , Cao Jian , Hu Xun Qiang
Published: February 2012

In order to evaluate the air-to-surface missile bearing-only attack effect u, the paper introduces a method which is based on EspCreator platform to develop the virtual reality simulation system. The 3D geometric models of the sea view、fighter plane、 air-to-surface missile and the target battleship are established by the 3D Max. The visual simulation of ASM Attack under bearing-only target indication is developed on the EspCreator simulation platform. The shared memory technology is applied in visual scene parameter driving and the technology of integrating DirectX API into scene loop is applied for the real-time simulation of the radar beam. The simulation system can modify the parameters easily and intuitive display simulation results. It’s a new convenient approach for research and evaluation of the weapon application simulation.
Spectrum Assignment Algorithm Based on Clonal Selection in Cognitive Radio Networks
Authors: Wang Xiao Fei , Zhang Xi , Chen Yue Bing , Zhang Lei , Tang Chao Jing
Published: February 2012

An improved-immune-clonal-selection based spectrum assignment algorithm (IICSA) in cognitive radio networks is proposed, combing graph theory and immune optimization. It uses constraint satisfaction operation to make encoded antibody population satisfy constraints, and realizes the global optimization. The random-constraint satisfaction operator and fair-constraint satisfaction operator are designed to guarantee efficiency and fairness, respectively. Simulations are performed for performance comparison between the IICSA and the color-sensitive graph coloring algorithm. The results indicate that the proposed algorithm increases network utilization, and efficiently improves the fairness.
Performance Analysis of Multicarrier Code Division Multiple Access over Rayleigh Fading Channel
Authors: Uddin Jia , Faisal Mohammed , Azam Md. Facihul , Rahman A.F.M. Muzahidur
Published: February 2012

Recently, multi-carrier transmission schemes have been introduced into Code Division Multiple Access (CDMA) systems to gain advantages for high data rate transmission as well as security. Due to pseudorandom code there is no chance to Inter Symbol Interference (ISI). There are different techniques to mitigate multipath fading. One of the method is to transmit identical narrowband direct-sequence (DS) waveforms in parallel over a number of sub-channels using frequency diversity. Implementation this multi-carrier modulation technique in CDMA system is known as multi-carrier CDMA (MC-CDMA). In Rayleigh fading channel, due to multi-carrier modulation, when one subcarrier goes deep fade another subcarrier may remain safe. Therefore it combats multi-path fading and signal can be received in low bit error rate.
Research on Portable Virtual Oscilloscope Based on USB Bus
Authors: Niu Jun Hao , Li Zhi
Published: February 2012

A designed method of portable virtual oscilloscope with USB interface is proposed in this paper. The programmable gain amplifier (attenuator) circuit is used to adjust the different range of inputting signal to the A/D converter's. The A/D convert is realized by using ADS830E, which is a chip with maxim 60MHz sample rate and 8-bit data width. CY7C68013A, one chip of EZ-USB FX2 series, is used to achieve the data transfer to computer in block mode. The FPGA is programmed as an external host controller to control the gain amplification and attenuation circuit, and provide the sample clock for high-speed A/D converter ADS830E, and send the data to the Slave-FIFO. Application software is designed with VC++ platform to calculate and display the received data graphically.
Optimization of Machining Parameters Using EDM in Gas Media Based on Taguchi Method
Authors: Wang Der An , Lin Yan Cherng , Chow Han Ming , Fan Shih Feng , Wang A Cheng
Published: February 2012

The aim of this study is to investigate the machining characteristics of gas media used in electrical discharge machining (EDM). The process parameters were designed based on Taguchi method to manage the experimental work. The main process parameters such as machining polarity, gas pressure, peak current, pulse duration, type of gas media, and servo reference voltage were adopted to explore their effects on machining performance in terms of material removal rate (MRR) and surface roughness (SR) for SKD 61 tool steel. The experimental observed values were transferred to signal-to-noise (S/N) ratios, and then the significant machining parameters affecting obviously the machining performance were determined by analysis of variance (ANOVA). The optimal combination level of machining parameter for each machining characteristic was obtained by the S/N ratio analysis according to Taguchi methodology.
Granary Temperature and Humidity Detection System
Authors: Jin Lin , Zhao Tong , Liu Qiang
Published: February 2012

The granary temperature and humidity measuring system , realization P89V51RD2 single chip as the main control core, and a RS232 bus communication mode of granary temperature and humidity monitoring system. Host by P89V51RD2 master MCU driving, and display temperature, humidity, and Luminance, entering commands by keyboard. Attached master machine used 51 core chip STC12C2052AD , digital temperature and humidity sensor SHT10 is used for data acquisition, master and attached master machine all use of serial communication. When the temperature and humidity calibration value is exceeded, it will alarm at the same time.
Heavy Metal Pollution in City Topsoil Fuzzy Clustering Model
Authors: Wang Xing , Li Xue Jiao , Ke Pu , Zhang She Sheng
Published: February 2012

It is a hot research project to find the heavy metal distribution in city topsoil and the level of pollution in city function region. Based on two dimension theory of Weiersreas, the eight heavy metal distribution is obtained, and the number of function region is calculated. Considering longitude and latitude of the polluted region, the high concentration distribution of heavy metals in area and the surrounding area is get. The pollution domain is found by using reverse Markov chain. The heavy metal pollution source is calculated from Gaussian diffusion model.
A Fuzzy Cluster Mathematic Model of City Topsoil Heavy Metal Pollution
Authors: Liu Xin Yun , Wu Guang , Zhang She Sheng
Published: February 2012

By analyzing the propagation characteristics of heavy metal pollutants, a fuzzy clustering model is established. Based on the topography, residential areas, factories, roads, etc. as well as the index Muller, we get the degree of heavy metals pollution and a evaluation on comprehensive pollution, and we found that the weight of pollution of each category and the index of the comprehensive pollution of heavy metals on the region by using fuzzy clustering and fuzzy AHP
EMD and Envelope Spectrum Based Bearing Fault Detection
Authors: Li Zhen Tao , Li Hui
Published: February 2012

A novel method to fault diagnosis of bearing based on empirical mode decomposition (EMD) and envelope spectrum is presented. EMD method is self-adaptive to non-stationary and non-linear signal. The methodology developed in this paper decomposes the original vibration signal in intrinsic oscillation modes, using the empirical mode decomposition. Then the envelope spectrum is applied to the selected intrinsic mode function that stands for the bearing faults. The basic principle is firstly introduced in detail. Then the EMD is applied in the research of the fault detection and diagnosis of the bearing. The experimental results show that the proposed method based on EMD and envelope spectrum analysis technique can effectively diagnose the faults of bearing.