bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Applied Mechanics with Reservoir Interwell Dynamic Connectivity Model and Inversion Method in Case of Shut-In Wells
Authors: Kang Zhi Jiang , Zhao Hui , Zhang Hui , Zhang Yun , Li Ying , Sun Hai Tao
Published: April 2014

Due to the limitations that the current interwell connectivity can not consider shut-in wells and the inversion solving method is not reliable, a novel model that can consider the compressibility and shut-in situations is established. In order to further decrease the ill-posedness of the solutions for the connectivity model, a constraint optimization algorithm by using Bayesian theories and projection gradient method are proposed. The tests for a synthetic reservoir model and a real oil field indicate that the proposed methodology can efficiently estimate the interwell connectivity with high precision and reliability for practical application.
Kinematic Mechanics in Exposure to Heat and Blood Pressure among Male Steelworkers
Authors: Wang Dao Gang , Tang Yong Mei , Liu Wei Tian , Li Ying Xue , Tian Zhen Zhen
Published: April 2014

To study the kinematic mechanics in exposure to heat and blood pressure among steelworkers. 403 heat-exposed male steelworkers and 102 non-heat-exposed male workers at the same workshop were studied. WBGT index, blood pressure were measured and hemorheology was detected. The results of this study show that blood viscosity, plasma viscosity, and hematocrit were positively correlated with systolic and diastolic blood pressure (P<0.05). Exposure to heat was a major risk factor for hypertension. Exposure to heat can elevate blood viscosity, plasma viscosity, hematocrit and blood pressure. Therefore, workshops with high temperature must do their best to lower environment temperature in order to control blood pressure and promote occupational population health.
Kinematic Parameters Comparative Analysis on Snatch in Different Levels
Authors: Yang Shi Yong
Published: April 2014

By means of 3D motion video analysis method and kinematic theory, the current study compared the kinematic parameters characteristic between senior and junior weightlifters. Six male weightlifters participated in this study. After analyzing the captured images, the study draws the conclusions as follows: (a) the distance of COG between body and barbell of the senior weightlifters is shorter than that of the junior weightlifters, (b) the senior weightlifters have the better ability to maintain the COG of body and barbell within supporting surface during the turnover under the barbell to the rising from the squat position.
Biomechanical Kinetics Analysis of Flexors and Extensors on Knee Joint in Soccer Players
Authors: Li Pan
Published: April 2014

Using kinetics measurement method with CON-TREX biomechanical test system to reveal the peak torque of flexors and extensors in knee joint under different velocities in soccer players. Thirteen male college students participated in this study,. After analyzing the data collected by kinetics measurement device , this study reached the following conclusion that (a) there is no significant difference in different velocities on absolute peak torque and relative peak torque in knee joint of soccer players,(b) the knee joint extensor and flexor muscles in different velocities in soccer players should be developed with balance.
Viscoelastic Properties of Phagocytes in Arteriosclerotic Origin
Authors: Zeng Wei , Shi Yan Rong , Deng Xiao Yan
Published: April 2014

A micropipette aspiration technique was adopted to investigate the viscoelastic properties of phagocytes of arteriosclerotic origin. A standard linear solid model was employed to fit the experimental data and three viscoelastic coefficients were used to compare the mechanical properties of the phagocytes in different phases during arteriosclerostic development. The experimental results indicated that prior to the formation of arteriosclerosis, the mobility and deformability of the marcopahges matured from monocytes decreased, and their rigidity increased. At the initial stage of arteriosclerosis formation, the mobility and deformability of the foam-cells further decreased. This finding may have important implication in the research field of arteriosclerosis.
Research on Biochemical Materials with Hydroxylation of Androst-4-en-3,17-dione by Colletotrichum lini AS3. 4486
Authors: Ren Jia Jia , Shen Yan Bing , Ge Ri Le , Wang Min
Published: April 2014

Microbial transformation of androst-4-en-3,17-dione (AD; 1) usingColletotrichum liniAS3. 4486 resulted in the production of two metabolites 2 and 3. The structures of these compounds were elucidated by spectroscopic analysis (LC-MS, FTIR and NMR) as 15α-hydroxyandrost-4-en-3,17-dione (15α-OH-AD; 2) and 11α,15α-dihydroxyandrost-4-en-3,17-dione (11α,15α-diOH-AD; 3). AD underwent regioselective hydroxylation at 15α position, subsequently hydroxylated at 11α position and converted to compound 3. 11α,15α-diOH-AD as an important metabolic product was pharmaceutical intermediate and the yield was up to 97.58% when the concentration of substrate was 4 g L-1.
Research on Biological Materials by Applied Technology with an Algorithm for Identifying and Counting Cells in Microscopic Particle Image
Authors: Zhang Sui Yuan , Wang Rui , Chen Xian Qiao , Jiang Ze Wu , Cai Xiang
Published: April 2014

Cells are fundamental units of life, and the key point in the field of biomaterial. Biological cells are always with high density, small nucleus and much impurities. Based on the technology of image processing, we propose a new method to count cells on the image of microscopic cells with high level of recognition. To precisely count the number, our method includes edge detecting and marking, efficient usage of three channel information of enhanced nucleus, binaryzation of dynamic threshold in separated areas and finally denoising. The experiment shows that the method is precise and quickly-reacted, moreover it can effectively rule out the impact of impurities. With little adjustment, it can apply to some other fields, not only decrease the labor involved, but the budget as well.
Applied Research in Cartesian Impedance Control for 6-UPS Space Docking Mechanism
Authors: Sun Ze Yang , Liu Gang Feng , Wang Meng , Chen Xue Sheng , Zhao Jie
Published: April 2014

In order to ensure the security buffer of the 6-UPS space docking mechanism, real-time control based on contact force is needed. In this paper, a highly effective Cartesian impedance control method based on the feedback signal from 6 force sensors is presented, and a brief introduction to the mechanical structure of the 6-UPS docking mechanism and the control structure of the docking system is given. According to the data analysis of ground experiment, this control method can tremendously improve the buffer effect in the docking stage with the parameters optimized in Simulink.
Applied Technology in Intelligent Home Furnishing Control System in Internet of Things Based on SCM Microcontroller and GSM
Authors: Yuan Jin Song , Zhang Jian , Wang Yi
Published: April 2014

Main function of the intelligent home control system in internet of things is including the family equipment automatic control and home security. The applied technology of STC89C52 chip and the GSM module of TC35 modem are as the control core, temperature, humidity sensor for environmental information acquisition source, to create a smart Home Furnishing system. The applied technology content of experimental prototype includes the design of the system hardware and software debugging and controlling the writing and debugging. The results show that, the applied technology of circuit and software can finish the test basic functions.
Applied-Information Technology in Network Control System under the VB-Matlab Integration Environment
Authors: Zhang Zhong Shi , Fu Li Xia , Zhang Yong , Mao Jian Lin
Published: April 2014

In order to get better effect to control the controlled object with uncertainty, non-linear and Multiple variables in the network environment,we designed the Network Control System in this paper which is based on Interface Programming between Matlab and VB.By using the Winsock of VB in network environment, the data can communicate between control system and controlled object under TCP-IP protocol,the data communication which is between VB and Matlab is depended on ActiveX in control system. In this paper,we take a linear inverted pendulum experiment with linear quadratic optimal level control for example in a network environment. the results show that the system can be stable and reliable on real-time object inverted pendulum control,The system has a certain reference value for factory equipment real-time data transferring and monitoring.
The Constitutive Model of Solid Ice and Snow with Material Properties Based on the Microscopic Mechanical Deformation
Authors: Li Ya Qin , Wu Wen Fu , Wang Jun Fa , Li Xiao Xia , Qiu Xin Wei
Published: April 2014

The microscopic deformation mechanism was taken into account to research the high efficient solid ice and snow clearing technology. The solid ice and snow constitutive model was established, which the deformation mechanism of snow microstructure and macroscopic continuous behavior were linked together, considering the damage of solid ice and snow depends on the mechanical properties of the snow volume elements of the grain bonds between grains, and using the microstructure factor scale the stress state of microstructure in the continuous stress. The density is 520Kg/m3-600Kg/m3 of the solid ice and snow was selected for studying and the homogeneous triaxial loading test was conducted by using the SJ-1A strain control type triaxial shear instrument. The relations of local strain rate with limit stress was established according to the simulation analysis conducted the constitutive model that was been established, the results found that both of those showed a near-linear relations, it was fit with the experience relations. The computer simulation and experimental curves deviated a little, and the reasonableness of the established solid ice and snow constitutive model was verified. Studied have shown that the failure rule of solid ice and snow can be well described by the constitutive model, which presents a theoretical reference for the design of key icebreaking components.
Research on SDH-Based Time Comparison with Applied-Information Technology
Authors: Yao Ying , Zhang Shou Gang
Published: April 2014

This paper proposed two kinds of precepts on time comparison for SDH network in practice. The precepts are the method of double-end bi-directional and the method of single-ended one-way. The computational model and network configuration of those precepts are given in this paper. Through the first precept, the time delay of fiber transferring can be got also, so the method can be used to time deliver too.
Applied-Information Technology with Two Modified Newton-Type Methods in Order of Convergence Six for Solving Nonlinear Equations
Authors: Fang Liang
Published: April 2014

With the rapid development of information technology and wide application of science and technology, nonlinear problems become an important direction of research in the field of numerical calculation. In this paper, we mainly study the iterative algorithm of nonlinear equations. We present and analyze two modified Newton-type methods with order of convergence six for solving nonlinear equations. The methods are free from second derivatives. Both of them require three evaluations of the functions and two evaluations of derivatives in each step. Therefore the efficiency index of the presented methods is 1.431 which is better than that of the classical Newton’s method 1.414. Some numerical results illustrate that the proposed methods are more efficient and perform better than the classical Newton's method.
Information-Applied Technology in Employee Involvement and Participation (EIP) Based Knowledge Map Building
Authors: Liu Jian , Zhou Jian , Wang Zhao Wei
Published: April 2014

Knowledge map is key part of knowledge management; it is the most powerful tool of knowledge share. Base on the analysis of characteristic, utility of knowledge map and Employee Involvement and Participation (EIP) characteristics, author builds Knowledge Structures Map, Knowledge Applications Map. Base on the research, author proposes 5 steps to build knowledge, and then illustrate the model via a case study with Information-applied Technology. This paper discusses and explores application of knowledge map in Employee Involvement and Participation (EIP) management.
Applied Technology in Exploration of Libraries Information Literacy Network Free Course Management Service Platform-Huazhong Agricultural University Library as an Example
Authors: Wu Fang , Fang Dong Quan , Che Yong Jian , Li Cui Xia , Tang Jing
Published: April 2014

With the rapid development of computer network technology, traditional teaching has been unable to meet the needs of modern teaching, especially for multi-disciplinary, interdisciplinary some elective courses - such as library information literacy courses. We need to use the Internet to reform teaching methods. It is also a lot of schools and units are doing. In this paper, the library information literacy courses, for example, free architecture of a network of research and teaching management services platform, designed to serve teachers and students, so teaching, learning and feedback with each other, sharing feature is now fully raise public library programs, sharing of teaching resources.
The Test of Aircraft Material with Performance Parameters
Authors: Ren Xia , Ma Lian Xiang
Published: April 2014

This paper uses the ABAQUS finite element analysis software for modeling and nonlinear analysis of aircraft tires. Paper H44.5 × 16.5-21 aviation tires, The plastic material of the tire subjected to uniaxial stretching to obtain a rubber such as Young's modulus, Poisson's ratio of the material parameters. Uniaxial tensile test tests the tensile properties of the rubber, the use of large-scale numerical calculations and fitting analysis of the experimental data analysis software Matlab, Yeoh model mechanical parameters.
Research on Ceramic Manufacturing for Creating and Solving Ceramic Formulations Model
Authors: Ye Jun Yao , Liu Ke Ning , Wang Ying Lian
Published: April 2014

This paper describes some theories on basic designing optimization problem, and then establishes the multi-objective optimization mathematical model of ceramic blank. It transforms the ceramic formulation problem in real-world into a mathematical algorithm problem. It also provides a good theoretical basis for a computer to process ceramic formulation. Finally, we transforms the ceramic blank problem from mathematical problem into matrix equation, solving the quality percentage of each ingredient in the formulation program, which has achieved some good results to a certain extent, but still requires further study.
Research on Aviation Material with Unsafe Events Prediction Based on BP Neural Network with PCA Feature Extraction
Authors: Gan Xu Sheng , Li Hua Ping , Duanmu Jing Shun
Published: April 2014

In order to better predict the aviation material unsafe events, a BP neural network model based on PCA feature extraction is proposed. Firstly, the training samples of aviation material unsafe events are used to carry out the PCA feature extraction, and then using the extracted basic features, BP neural network model is established. The numerical example shows that, the hybrid model proposed is better than that of alone BP neural network model, and it is effective and feasible to establish the unsafe events model for aviation material.
Application of Converter Dust with Mechanical Properties
Authors: Li Hui , Liang Jing Long
Published: April 2014

the formation mechanism and characteristics of converter dust, analyzed using the method of converter dust, drawbacks of the utilization of converter dust, put forward their own point of view, for the future of converter dust with high added value direction.
Study on Composite Materials Used in the Tennis Racket
Authors: Sun Tie Huan
Published: April 2014

In many sports, tennis occupies an important position. For a tennis player, it is an important factor in a good pair of tennis to win the game. The composite materials in the production process in tennis racket are studies in this paper. Analyzed and demonstrated several ways from its function and structure, process performance, process and process analysis. Finally, the production process of the racket will be detailed study, and then a conclusion will be get that is composite material has important practical value in the production of a tennis racket.
Utilization of Converter Dust for Preparing High Solid Coatings
Authors: Li Hui , Liang Jing Long
Published: April 2014

The converter dust was produced in steelmaking process. The particle size of converter dust is fine, and it contains a variety of oxides as well. The traditional recycling method is that returning the converter dust as raw material to sinter for recycling. The new recycling method is that making the dust as fillers for preparing high solid anticorrosive coating, which has important theoretical significance and application value.
Research on Manufacturing Logistics with Applied Technology Based on Logistic Distribution Probability Function and Elman Neural Network of Wind Power
Authors: Ma Yu Long
Published: April 2014

This article focuses on the probability distribution of wind power fluctuations and prediction problems, on this basis, putting forward new ideas for wind blade manufacturing process. Depending on that wind power has the characteristics of volatility, this article finds the probability distribution of wind power fluctuations in Logistic function is the best fit between the location - scale function, Logistic function, Extreme value function, and Normal function, Then, this article utilize the Elman neural network prediction model to forecast the wind power in the coming period of time, good results are obtained. Finally, we use new ideas in the manufacture of wind turbine blades with whole hollow, pitch type, carbon fiber as a reinforcing material.
Applied Information Technology in Countermeasure Research on "Demotivation" of Non-English Majors with English Learning Difficulties in Private Universities
Authors: Li Qing Yun
Published: April 2014

This paper explains and demonstrates how to throw away “demotivation” of non-English majors with English learning difficulties. Those learners usually attend English classes with little or no motivation. Teachers need to use proper teaching contents and strategies to motivate them. With restricted class hours, applied information technology plays a very important role in their English learning goals’ setting up and maintenance and in evaluation and in the process of interation.
Study on the Preparation of WO3/TiO2 Composite Photocatalyst and its Photocatalytic Activity
Authors: Su Tian E , Miao Chao Lin
Published: April 2014

WO3/TiO2 composite photocatalyst was prepared from tetrabutyl titanate, ammonium tungstate by sol-gel method. The influence of acetic acid and ethanol on the gel point time, and the influence of doping amount of W on the photocatalytic activity was studied. The properties of powders were characterized by Fourier transform infrared spectrometer(FT-IR), and the photocatalytic activity was characterized by probe reaction of methyl orange degradation. The results show that the homogeneous transparent precursor is prepared at the amount of acetic acid =1mL and the amount of ethanol =10mL.When the doping amount of W reached to 0.12%, the best photocatalysis efficiency was obtained. Under the experimental conditions, the infrared absorption band of the W－O was not observed.
Synthesis of Porous Spheres of TiO2 Nanoparticles and its Photocatalysis Behavior for 1-Naphthylamine-4-Azobenzene-4'-Sulfonic Acid
Authors: Xia Juan Juan , Yang Ming , Huang Yu , Li Dai Xiong
Published: April 2014

Porous spheres of TiO2 nanoparticles have been successfully prepared using cationic monomer as precursory solid and thermal decomposition at 500 oC. The product was characterized by X-ray powder diffraction and scanning electron microscope. The ultraviolet photocatalytic activity of the obtained materials was evaluated by decomposing 1-naphthylamine-4-azobenzene-4'-sulfonic acid. The porous spheric TiO2 exhibited a good photocatalytic activity. The degradation rate was about 96.5% for in contaminated water after 50 min irradiation by UV light.
Research on Involute Gear Undercutting with Mechanical Mechanics Based on Neural Network
Authors: Deng Xu Lei , Xiao Jun , He Jia Ning , Ma Wu Xing , Li Yan , Li Jin Song
Published: April 2014

This paper is based on the neural network nonlinear mapping characteristics. The involute gear tooth number, modulus and their relationship model of cutting the amount effect are established respectively. Through MATLAB simulation gets the relation curve between the number of teeth and modulus. These curves can intuitive reflect the tooth number and modulus effects on cutting amount change, which provides valuable theoretical reference for the design of the involute gear.
Image Copy Detection Based on DCT Ordinal and Block Median
Authors: Sun Yi Gang , Yang Yu , Liu Jing Ya
Published: April 2014

As for highly repetitive image of Internet, a new image algorithm combined with DCT and block median method is designed. As there is a certain correlation between low-frequency coefficient of DCT and image scaling, the sequence vector of DCT coefficients is introduced with block median method to make up the defect of DCT processing for multi-channel image supplied. Through the combination of DCT and block median method, the recall and precision of new algorithm is over 95%. New algorithm works well in image scaling, resists well against watermarking attack and is able to detect the copy of target image fast and accurately from a large scale image datasets.
Research of Signal Processing Based on Kalman Filter and Particle Filter
Authors: Jin Ou Yang , Li Yan Song , Liu Jun
Published: April 2014

The current transducer is the premise condition of electricity measurement, relay protection, monitoring and diagnosis system, and power system analysis. This paper introduces the principle and signal to noise characteristics of optical current transducer (OCT), which is based on Faraday Magneto-optic effect. Then, proposed uses the kalman filter and particle filtering method to improve the output SNR of OCT, for the OCT has a low SNR. At last, Establish the both particle filter dynamic model for AC and DC situation, After choosing appropriate parameters of the kalman filtering and particle filtering mix method on the matlab simulation of the above situation, the results show that the kalman filtering and particle filtering mix method can improve the output SNR and measuring accuracy.
A Frequency Reuse Scheme Based on Interference Pre-Cancellation and Resource Scheduling for Multi-Beam Satellite Downlink Signal
Authors: He Yi Nuo , Zheng Wei , Li Bin , Gao Ya Zhe , Wu Jian Jun
Published: April 2014

A frequency reuse scheme is proposed in this paper for multi-beam satellite system to improve spectral efficiency as well as system capacity. Firstly, in order to reuse same channel among beams, Tomlinson-Harashima precoding (THP) is introduced to pre-cancel downlink interference of users from different beams. Secondly, a resource scheduling algorithm is proposed to jointly work with THP. Finally, simulations are executed to validate the proposed scheme, which suggest that compared to traditional frequency reuse scheme, the proposed frequency reuse scheme can successfully eliminate co-channel interference with a high spectral efficiency.
Improved Relative Term Frequency Probability Feature Selection for Document Categorization
Authors: Li Qiang , He Liang , Lin Xin
Published: April 2014

Feature selection is an important process to choose a subset of features relevant to a particular application in document classification. Those terms which occur unevenly in various categories have strong distinguishable information as to categorization. Firstly, based on the categorical document frequency probability (CTFP), a CTFP_VM feature selection algorithm was designed for feature selection. Secondly, a maximum term frequency conditional distribution factor was proposed to improve the CTFP_VM criterion further. We perform the document categorization experiments on SVM classifiers with the well-known Reuters-21578 and 20news-18828 corpuses as unbalanced and balanced corpus respectively. Experiments compare the novel methods with other conventional feature selection algorithms and the proposed method achieves the excellent feature set for document categorization.
A Study on Effect of PFA on Stabilized Material Using Direct Shear Test
Authors: Shakri M.S. , Hafez M.A. , Adnan M.A.
Published: April 2014

Pulverized fuel ash (PFA) can be classified as hazardous Coal Combustion by-Product (CCP), which can contributes to the environmental pollution. According to (ACAA 2009), USA itself has produced approximately 125.5 million tons per annual of CCP which merely 56 million tons of these waste by-products has been successfully employed in applications and others still remain untreated. Disposal of these materials in landfills can deduce ecological. Thus, finding the solutions and methods of recycling these waste materials are needed, as it can be used as one of the materials in construction projects, engineering purpose or stabilizing process. Therefore, a study on direct shear test have been conducted and the data collected from this study were compared and analyzed through various methods to find out how does PFA works on improving geotechnical properties.
The Use of OpenMP Parallel Standards in Massive Data Delaunay Triangulation
Authors: Li Jian , Guo Bing Xuan , Xiao Xiong Wu
Published: April 2014

This paper uses OpenMP parallel standardsin massive data Delaunay triangulation.Based on the Fork/Join parallel mode in OpenMP, a quad-tree is designed to divide and map the point cloud data.And the hierarchical implementation of triangulation and merging operations are based on it. A WFM-JLP algorithm is used to schedule triangulationand merging operations in order to achieve better load balancing. Experiment show the proposed method can greatly reduce the real-time memory and computing time.
Approaches in Pattern Recognition and Classification Based on Coin Images
Authors: Wong Chee Kong , bin Mohd Shukran Mohd Afizi , Lee Fong Yee
Published: April 2014

This paper discusses the various texture-based and vector-based approaches to classify coins.These two types of approaches are common for software-based coin sorting systems. Many researchers have applied algorithms known in artificial intelligence research for feature extraction, selection and classification of coin images. However, without a common benchmark, it is difficult to assess the accuracy, robustness and efficiency of the coin sorting systems across the different approaches. It is proposed that the use of a standard benchmark image databank such as the CIS Benchmark will allow a more objective and accurate comparison of the performance of these coin classification approaches.
Research of the Transient Signal Recognition Based on Empirical Mode Decomposition
Authors: Wang Wan Jin , Chen Kui Feng
Published: April 2014

This paper introduces the empirical mode decomposition (EMD) method of the basic theory, problems and means to solve. Apply the approach to mechanical vibration signal containing a transient pulse processing and analysis carried out, and the wavelet time-frequency analysis methods are compared, the results show that it can effectively decompose nonlinear and non-stationary vibration signals, and has a self-adaptive, and in the time domain and frequency domain have better resolution capabilities, and the component with a more clear physical meaning. Due to its diversity of showing the results, you can make further precise analysis of a single component, and the transient signals can be effectively recognized, and can locate mutation point in time, describing the time-frequency localization properties. EMD, transient signals, mechanical vibration
Solution of Travelling Salesman Problem Using Ant Colony Algorithm
Authors: Gülcü Sevda Dayıoğlu , Gülcü Şaban , Kahramanli Humar
Published: April 2014

Recently some studies have been revealed by inspiring from animals which live as colonies in the nature. Ant Colony System is one of these studies. This system is a meta-heuristic method which has been developed based upon food searching characteristics of the ant colonies. Ant Colony System is applied in a lot of discrete optimization problems such as travelling salesman problem. In this study solving the travelling salesman problem using ant colony system is aimed.
A Modified Energy Detection Algorithm Based on Primary User Activity for Cognitive Radio Networks
Authors: Han Gang Tao , Ding Ying Qiang , Mu Xiao Min , Zhang Jian Kang
Published: April 2014

Spectrum sensing is used to identify the unused frequency bands and as such plays a key role in dynamic spectrum access. In most of the existing spectrum sensing models, the channel state of primary user is assumed unchanged within the spectrum sensing duration, which is not suitable for the channels with high activity, in which the primary user accesses or vacates from the channel frequently. In this paper, a Modified Energy Detection (MED) algorithm is proposed for this scenarios by considering the primary user activity within the spectrum sensing duration. Theory analysis and computer simulation results show that both the probability of detection and false alarm in this scenarios have been improved with our MED.
Joint Transmit Antenna Selection and User Selection in Cognitive Radio MIMO Systems
Authors: Li Jie , Li Shuang Zhi , Mu Xiao Min , Zhang Jian Kang
Published: April 2014

Using multiple antennas in coexisting radio systems can cancel or control the co-channel interference and hence improves the overall spectrum efficiency. However, the hardware complexity and costs limit the usage of multiple-antenna technology. Antenna selection may reduce such costs while partly remaining the advantage of the multiple-antenna technology. In this paper, a fixed power cognitive radio system model jointly combined with antenna selection and users selection is set up. And the mathematical closed-form expressions of the channel capacity and bit error rate (BER) are obtained through mathematical derivation. Simulation verifies the correctness of theoretical results and shows that the system exists an optimal transmit power which optimizes the system performance. Furthermore, the influences of users number and antennas number on the system performance have been studied.
Chiral Structure in a Hard/Soft/Hard Layered Magnet
Authors: Wang Zi Jun , Liu Yun Tao , Xiao Hong Wen , Chen Na
Published: April 2014

Micromagnetic simulation enabled us to fully characterize the nucleation and growth of buried domain walls in a layered hard/soft/hard ferromagnetic thin film. Simulation results show that the exchange spring trilayer exhibits a spiral spin magnetic structure and reveals detailed features of field-dependent domain walls evolution.
Design of a Smart Antenna Using Butler Matrix for WLAN Applications
Authors: Soualmi Nouamane , Li Hou Min
Published: April 2014

A 5.8 GHz band smart antenna system of 4-elements microstrip linear array antenna with Butler matrix beamforming network is designed. The Butler matrix smart antenna is designed for WLAN applications using microstrip technology. System’s design and optimization was based on computer simulations using ADS momentum. The Butler matrix components like the hybrids couplers, the cross-couplers, and the phase shifters are designed and optimized one by one to get the best performances. The prototype is simulated on Rogers RT /duroid 5880 substrate with a relative permittivity of 2.2 and height of 0.787mm. Finally, the isolations of the Butler ports, the power distributions at the outputs, the return loss and the radiation pattern are presented in detail, in order to prove the system’s performance.
An Effective Improved On-Demand Routing for LEO Satellite Networks
Authors: Ren Zhi , Du Bao Yang , Liu Yan Wei , Li Ji Bi
Published: April 2014

In our Study, we Find that Location-Assisted on-Demand Routing (LAOR) Algorithm has Redundancy Control Overhead. Furthermore, LAOR does Not make Full Use of the Effective Information of New Path to Complete the Follow-up Path. to Address these Issues, an Improved Effective on-Demand Routing, Effective Improved on-Demand Routing (EIOR) Algorithm, is Proposed in this Paper. EIOR Makes Full Use of the Information of Control Packet to Update more Routing Paths, Reduces the Control Overhead for Finding Path and Increases the Real Time of Routing Updates. Moreover, EIOR Increases the Probability of Intermediate Satellite Replies Request Instead of the Destination Satellite, which Shortens the Setup Time of Path and Reduces the End-to-End Delay. it also Designs the RREP Immune Mechanism to Reduce the Control Overhead of the Network. Theoretical Analysis and Simulation Results Show that EIOR Outperforms LAOR. the EIOR can Reduce at Least 7% of the Normalized Control Overhead and 4% of the Average End-to-End Delay.
Design of Wireless Voice Communication System in Underground Coal Mine Based on ZigBee
Authors: Wang Da Hu , Zhang Qie Qie , Sun Yi Fan
Published: April 2014

For disadvantages of the present mine voice communication systems, a kind of wireless voice communication system based on Zig Bee is put forward. The paper provides detailed informations about hardware and software of the wireless voice communication device. In the system, adopt CC2530 as RF sending-receiving unit of voice communication node, convert speech signals to digital or analog signals by CSP1027, encode or decode quantized voice data by AMBE voice codec technology and realize voice message two-way wireless communication over the Zig Bee wireless communication protocol IEEE 802.15.4 between voice communication devices. Experiments have shown that voice communication device can get a clear voice and have a high reliability in the effective distance of communication, meet the requirements of voice communication.
Adaptive H∞ Power and Rate Control for Time-Varying Uncertain Wireless Networks via Dynamic Output Feedback
Authors: Han Cun Wu , Sun De Hui , Li Zhi Jun , Shi Yun Tao
Published: April 2014

This paper investigates power and rate control for wireless networks with time-varying uncertainties. A new power and rate control algorithm via dynamic output feedback is presented based on adaptive control technique and robust H∞ control approach. The adaptive H∞ performance of the closed-loop system is analyzed based on the linear matrix inequality (LMI). Simulation results are given to demonstrate the effectiveness of the proposed controller.
A Neural-Q-Learning Based Approach for Delay Tolerant Underwater Acoustic Wireless Sensor Networks
Authors: Zou Lin , Huang De Feng , Togneri Roberto
Published: April 2014

Delay tolerance is a major design concern for supporting underwater acoustic wireless sensor networks (UA-WSNs) to carry out tasks in harsh subsea environments. Due to the great difference between the underwater acoustic channel and the radio frequency channel, most of the existing routing protocols developed for terrestrial wireless sensor networks perform poorly in underwater acoustic communications. In this work, we present a Neural-Q-Learning algorithm based delay tolerant protocol for UA-WSNs. Due to the advantages of the artificial neural network along with the Q-Learning algorithm, the ferry node is capable of determining an optimal route in a two-dimensional continuous space to relay packets effectively and efficiently between sensors. Simulation results show that the delivery delay and delivery cost of the network significantly decrease by maximizing the meeting probability between the ferry node and sensors.
Research and Application of Information Management for NC Equipment
Authors: Fang Zhi Liang , Wu Xing Jie , Fang Bai Xin
Published: April 2014

Focused on the operation management of equipment, the workflow of NC equipment informatization management was deeply analyzed in this article. The functional structure of equipment management system was studied here. And, the equipment information management system was developed based on B/S structure. The system was applied to manage the basic information, Spare parts and Maintenance of the NC Equipment by way of information and automation, and realize the traceability of equipment maintenance and spare parts management throughout the whole Life Cycle. The alete integration of the Equipment Information Management System and other system, such as DNC, MES and ERP, was realized. And the integrated system effectively promoted the information interaction between layer of enterprise, workshop and equipment.
Modeling and Simulation of Indoor Millimeter Wave Propagation Characteristics
Authors: Sun Zeng You , Zeng Fan Ming
Published: April 2014

As the complexity of the indoor propagation environment so that the accuracy of analyzing the millimeter wave propagation characteristics are affected. In this paper, ray tracing method is used to analyze the situation of ample area and finite-difference time domain is used to analyze the complex area contains a discontinuity point. The methods are combined to research the indoor millimeter wave. Working frequency was given at 30GHz, source respectively in both indoor and outdoor situation, indoor millimeter propagation characteristics and method of modeling. Simulation results from MATLAB were compared with reference and show that the hybrid method is helpful and accurate for modeling the indoor millimeter.
The Bionic Optimization and Analysis and Calculation of the Cast-Steel Joint with Three Branches
Authors: Zhu Zheng Hao , Du Wen Feng , Sun Zhi Fei , Zhu Li Ming
Published: April 2014

The tree-like structure is a branch of space bionic structures,belonging to the Bionic Architectural Structures. Cast-steel joints with branches are the keys to build the tree-like structures.They are used widely,and the most common joints in our projects are cast-steel joints with two、three and four branches. The cast-steel joints with two branches are planar,while the joints with three and four branches are spatial.Until now,the basic theoretical researches about the cast-steel joints with branches are also relatively scarce.This paper did researches about mechanical properties, calculation methods and structural optimization of the cast-steel joints with three branches deeply and systematically. The result shows that the bending moment has a big influence on the value of the max stress. And the three main failure modes of the cast-steel joint with three branches are yield of the main tubular along the axial direction, local buckling at the connection of the main tubular and branches, and the tearing out of the branches.
Review of Durability of Fiber Reinforced Polymer (FRP) Reinforced Concrete Structure
Authors: Huang Yao Hong , Guo Yong Chang
Published: April 2014

With the wide application of FRP reinforced concrete structure, the durability of FRP reinforced concrete structure causing more and more attention . This paper introduce domestic and foreign research situation of durability of FRP reinforced concrete structure in three aspects including FRP material, epoxy resin and FRP reinforced concrete structures .
Numerical Analysis on the Impact of Windows and Interior Doors on Indoor Airflow of Rural Residence
Authors: Fu Xiu Zhang , Dong Jian
Published: April 2014

There are several factors impacting on the indoor airflows, such as building openings, ambient wind speed, occupants’ behavior and so forth. This paper concentrates on the impact of windows and interior doors on airflows in a rural multi-storey residential building. The indoor airflow simulation was carried out by using the CFD software. 3 states of interior doors were set, and 60 regions were arrayed in bedroom to observe the variation of airflows. According to data of regions, the uniformity of airflow and the thermal comfort were analyzed. Simulation results identified that closing interior doors will increase the mean age of indoor air about 7 times as it under the condition of opening doors, which is from 90s to 666s. It also shows that transom windows is beneficial to improve natural ventilation efficiency, as it can raise the average wind velocity by 40% when interior doors are closed.
Simulation Analysis of Building Green Facade Eco-Effect
Authors: Pan Xin Chen , Xiao Yi Xuan
Published: April 2014

Purposes: this paper is to analyze and quantify the eco-effect of building green facade, providing a reliable application methods and theory basis for solving current environmental issues. Methods: this paper using facade renovation project of Wismar University in Germany as the carrier, it uses Energy-Plus energy simulation software, CFD computational fluid dynamics software and U-wert.net calculation software for U value of material to get the simulation analysis of the energy, physical and regional eco-effect of building green facade. Results: building green facade can increase 23.7% heat resistance value, save 6.2% of the year-round air conditioning load, reduce indoor temperature by 3-5°C in summer, reduce the air velocity by 0.03m/s, maintain the stability of indoor temperature, the annual indoor temperature can maintain 20.84°C, improve the indoor comfort. The temperature around the building can reduce by 0.5-4°C after green facade renovation, reduce the wind speed in the region by 0.05m/s, and reduce the annual carbon emission by 7.1%. Conclusions: Through the simulation results, eco-effect of building green facade play a significant role in cooling and insulation, energy saving, heat island mitigation, improving comfort, maintaining the balance of carbon and oxygen. It has become one important way to suture rift between man and nature in cities, being an effective way to solve today's ecological issues.
Micro-Analysis Ballast-Geogrid Pull out Tests Interaction
Authors: Jing Guo Qing , Luo Xi Haier , Wang Zi Jie
Published: April 2014

The discrete element method was used to simulate geogrid-reinforced ballast by pull out tests. Ballast particle was made of irregular clumps where its size and shape were considered by bonded spheres. The response of the ballast reinforced with geogrid under loading agrees with pull out experimental results. The micro-interaction between ballast particle and geogrid analyzed by microscopic parameters, contact force chain, force-displacement of the pull out tests was presented. It was also proved that the shape of granular particles, geogrid size and friction played an important role in ballast-geogrid system.
Construction Numerical Simulation of Cable-Supported Barrel Shell Structure Considering Construction Nonlinearity
Authors: Li Jia , Yu Jing Hai , Yan Xiang Yu , Liu Hong Bo
Published: April 2014

Based on an actual construction process, this paper put forward a nonlinear simulation analysis method, which can take the mutual influence between structural forming and the tensioning of the active-cables into account. The proposed method shows good performance in solving the problem of structure layout finding and the pre-stress calculation of pre-tensioning tendons by stages and in group. The method has clear mechanical conception and is of reference value for similar construction analysis.
A Validation Study for CFD Simulation of a Simplified Urban Model
Authors: Mohammad Ahmad Faiz , Zaki Sheikh Ahmad , Ali Mohamed Sukri Mat , Hagishima Aya , Razak Azli Abd
Published: April 2014

A proper setting of boundary conditions is a standard upon which simulation results are justified. This study is specifically designed to simulate airflow over a repeating unit of simplified urban models with the application of periodic boundary condition. Similar setting of boundary conditions is used for all models which are of square layout with 25% packing density. The models are constructed with such that the initial velocity field is uniform throughout its internal domain. The results show that different domain heights of 4h and 5h (h as the building height) do not affect the spatial averaging of velocity profiles. In terms of the number of grids per building height, a finer meshing of 32 grids produce more accurate results of velocities and turbulence intensities compared with those of 25 grids when validated against the previous direct numerical simulation (DNS) data. Nevertheless, these criteria depend upon longer averaging period for better estimation of flow statistics. The boundary condition setting used in this preliminary study is nevertheless capable of producing current results comparable to past data although future works should focus on optimizing the important criteria in a simulation such as domain height, grid numbers, and averaging time.
Real-Time Simulation of Pipe Network Based on EPANET
Authors: Zhang Gen Yuan
Published: April 2014

Hydraulic simulation models of water pipe networks (WPN) are routinely used for operational investigations and network design purposes. However, their full potential is often never realized because in the majority of cases, they have been calibrated with data collected manually from the field during a single historic time period and reflects the network operational conditions that were prevalent at that time. They were then applied as part of a reactive investigation. An urban water distribution network real time simulation system based on EPANET system using OPC (object linking and Embedding for Process control) communication was built in this paper. In order to make real-time simulation of water distribution network, the real-time data was collected every 15 minutes, the real time data were received and sent into water distribution network simulation model by OPC communication of EPANET system. The real-time data included total head of reservoir, flow rate, pressure, pump operation information. The real-time simulation system can give timely warning of changes for normal network operation, providing capacity to minimize customer impact and comparing the simulation results with the real-time data collected. The real time simulation system of urban water pipe network solved the problem of data input and user interaction compare to traditional network model. It offers a way for the development of intelligent water network.
The Simulation of Non-Gaussian Vibration Environment on Railway
Authors: Zhao Juan , Zhu Da Peng
Published: April 2014

During the transportation of railway, all kinds of transportation equipment are subject to random vibration generated by random road excitation. In practice, however, a lot of vibration caused by poor environment of railway show non-Gaussian incentive features. Based on IFFT transformation-based of Gaussian random, by analyzing the relationship among phase angle, kurtosis and skewness, the paper uses the second phase modulation method to generate the non-Gaussian excitation signal with the measured vibration data in the process of train running, and then using MATLAB, this method will simulate the real railway vibration of non-Gaussian excitation signal. The simulation result provides the theory basis for the reliability verification of laboratory and shipping goods, and has a certain practical significance for the improvement of train operation safety.