bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Laser Peening on Residual Stress and Micro-Hardness of TC4 Titanium Alloy
Authors: Qiao Hong Chao , Zhao Ji Bin , Zhao Yi Xiang , Li Lun
Published: June 2013

Laser peening offers potential advantages over conventional peen technologies in terms of the depth of the residual stresses that can be induced, and improvements in surface micro-hardness. The present study was undertaken to understand the effect of laser penning on the properties of titanium alloy, a TC4 titanium alloy work-piece was processed with ND: YAG laser with the wavelength of 1064 nm, pulse energy of 0-10J and pulse width of 12ns, and micro-hardness and residual stress for different laser peening parameters were examined and analyzed by micro-hardness tester and X-ray diffraction. Results are presented and discussed of the residual stress profiles and the micro-hardness profiles, The experimental results show that the satisfying laser peening appearance can be achieved when the pulse energy was 6J, water tamping layer thickness was 1.8mm and ablative layer thickness was 100μm, surface micro-hardness increased by up to 33% and the compressive residual stress on the surface of laser shocked area reached up to-327.8MPa, laser peening improved hardness and residual stress of titanium alloy significantly. The experiment results show that the effect of laser peening was evidently.
Analysis of the Influence of Cutting Parameters on Cutting Force Based on Cutting Process Simulation
Authors: Cao Yan , Chen Hua , Zhao Hai Xia
Published: June 2013

Based on the study on metal cutting theories and rigid-plastic finite element method, taking Sweden SECO lathe tool MDT as the researching object, the cutting force in cutting process is analyzed after a cutting process simulation model is constructed using finite element method. Different simulation parameters and cutting parameters are used to carry out analyses time after time. The dynamic changing curves of the cutting force in cutting process are obtained. Through the comparison of the cutting force in different cutting conditions, the influence of cutting parameters on the cutting force is summarized. The research can provide useful data for improvement of metal cutting technology and tool cutting performance.
Simplified Analysis of Blast Wave Overpressure Functions in Air
Authors: Li Jian Min , Xiong Shi Bo , Xiao Feng
Published: June 2013

Though analysis of the blast wave changing law and the basic equation of blast wave overpressure functions in air,blast wave overpressure functions have been simplified. A simplified form of blast wave overpressure function is acquired,and experimental certificated. The results show that the simplified function curve correctly reflects the characteristics of the experimental curve. The blast wave created to simplify the function is reasonable.
Structure Design and Parameter Sensitivity Analysis for MR Damper
Authors: Hou Suo Jun , Shi Wen Ku , Yang Wei
Published: June 2013

Vehicle active suspension semi-active suspension is usually used to reduce un-wanted vibration engrey from various road conditions and vehicle velocity. MR damper as a type of semi-active suspension can really rosove the problem. A new type MR damper is designed according to the original damper force characteristics of a military vehicle.The structure parameters of the damper have channel clearances, channel length, piston diameter and so on. Analysis on the MR damper force amplitude of variation from different current value (0~1A) and different damper velocity (0.052m/s~0.52m/s) is done in order to find the sensitive parameter influence to MR damper force.Thus it can provide the reference to design the damper structure. The result verifies the piston diameter is stronger to influence the damper force than channel clearances and channel length.
Experiment and Simulation Study on Parameter Obtaining of Hydraulic Mount with Air Spring
Authors: Shi Wen Ku , Yang Wei , Hou Suo Jun , Feng Guo Yu
Published: June 2013

Structural characteristics and working principle of hydraulic engine mount with air spring was described, and mathematical model was derived. As significant influence factors of dynamic characteristics of hydraulic engine mount, stiffness and damping of rubber main spring, bulk stiffness of the upper chamber and effective pump area of the main rubber and some other key parameters were obtained in experiments. Mathematical model of hydraulic mount was simulated to analyze the influence of specific parameter on dynamic characteristics of mount.
Structure and Lightweight Improvement of New Type of Mining Bucket
Authors: Hao Ni Ni , Yu Yan , Bao Ji Hua , Wang Ling , Gu Ming Xia
Published: June 2013

This paper takes the new type of mining truck bucket as research object and analyzes the strength and rigidity of the truck body in typical situations of dead load, swerve and slanting load. According to the analysis, the author will put forward four improvement measures in the stress concentration parts and give optimization design to those parts that have much allowance to the strength of the truck structure. The calculating result indicates that the improvement of the truck structure can significantly reduce the peak stress and improve the working life of the truck. In the premise of guaranteeing the strength of the truck structure, the weight of truck bucket induces from 30t to 27.1t achieves the goal of lightweight.
Cavitation Erosion Behavior in Different Throttling Pipelines
Authors: Liu Chang Jun , Ma Jun , Li Xiao Qiang , Su Yong
Published: June 2013

Throttling pipelines are adopted to improve their cavitation erosion resistance, while there often exists cavitation erosion, large energy loss and big noise in throttling pipelines. In this study, the three-dimensional (3D) model of the secondary throttling pipeline was constructed according to the actual structure and parameters. It has been calculated that compared to the ordinary throttling pipeline, the secondary throttling pipeline makes the maximum velocity decreased from 19.827 to 19.168 m/s, and the minimum negative pressure increased from-2.02 to-1.77 MPa. The results is significant for choosing and designing the throttling pipelines.
Experimental Research of Cylindrical Plasma Layer's Effect on Microwave Transmission
Authors: Cheng Li , Wang Kai , Wang Jia Chun , Yuan Zhong Cai
Published: June 2013

In this paper, cylindrical plasma was generated steadily in a cylindrical cavity by high-frequency AC discharge, and some cylindrical plasma were layered directly against each other to form a plasma layer. The cylindrical plasma layers effect on microwave transmission attenuation was measured by the vector network microwave measurement system in the frequency range 2~18GHz experimentally. The factor, such as wave polarizations, electron densities and the number of layers were analyzed. In the set of the experiments, cylindrical plasma layer was more effective to VP wave than HP wave. And this layer was effective in the frequency range 2~10GHz; in this band, the attenuation can be adjusted uniformly by changing the electron densities. The double cylindrical plasma layers were more effective than the single one.
Decoherence of Flux Qubits under Sub-Ohmic Bath
Authors: Fang Yang De
Published: June 2013

In two-level approximation, we investigate the influence of mutual inductive coupling in superconducting quantum circuits on the decoherence of flux qubits under sub-Ohmic thermal bath environment by utilizing Bloch-Redfield function. The investigation results show: (1) The memory effect existing in the solid-state environment is beneficial to prolong the decoherence time of the superconducting flux qubit, building sub-Ohmic thermal bath environments can improve the decoherence of the solid-state qubit. (2) When the quantum system and the thermal bath are in weak coupling, generally speaking, the mutual coupling effect between circuit elements will destroy the quantum coherence; but when the quantum system and the thermal bath are in strong coupling, it will help to enhance the decoherence time by controlling the mutual inductive coupling between the loop components.
Numerical Simulation and Analysis on the Impact Effect of Cylindrical Projectile Impacting Shelled Explosive
Authors: Jiang Ying Zi , Wang Wei Li , Huang Xue Feng , Fu Lei , Fan Zhuang Qing
Published: June 2013

The numerical simulation of shelled Comp.B explosive was studied following theLee-Tarverignition and growth model when it was impacted respectively by 4340 Steel, OFHC and 93#W projectile with the same mass; the influences on explosive detonation of the initiation process, the material of projectile and the L/D ratio of projectile were analyzed; the critical initiation speeds of the projectiles of three different materials with different L/D ratio were gained. In order to verify the simulation results, the questions were calculated by the theoretical simplified model, the results of the theoretical calculation and the numerical simulation accorded well based on critical energy criterion. The results show that the capability of igniting explosive, the first is 93#W, the second is OFHC, the last is 4340 Steel; The initiation point were not on the interface of shell and explosive, and the faster of the impacting velocity, the initiation point closer the interface; the bigger of the L/D ratio of projectile, the higher of the critical initiation speed.
Aesthetic of Entropy: An Architectural Archetype and Image
Authors: Wen Yi Feng
Published: June 2013

We generally have strong aesthetic feeling to historic sites. This article tries to focus on a topic concerning this kind of emotion from an archetypical perspective. "Entropy" is a core concept of the second law of thermodynamics and a modern response for old thinking about "fire". Difference from tools attitude of natural science, this article takes a kind of perspective of natural theology which united subject and object to explore the ontological and archetypical meaning of "entropy", as well as its reflection on building materials which embodied and recalled the natural process producing aesthetic qualities. This article gives case studies in this kind of building practices, as well as gives us to rethink material recycling and building sustainable development
Advanced FEM Analysis of Steel Pitched-Roof Portal Frames with Tapered Members
Authors: Cristutiu Ionel Mircea , Nunes Daniel Luis
Published: June 2013

Steel pitched-roof portal frame with tapered web elements is one of the most commonly used type of structural system low raised buildings where large free spans are required. In practice it is found that the most efficient solution is generally obtained by using tapered web elements, whiles the flanges are kept prismatic. Besides its economic and structural advantages, this refinement brings additional designing challenges for structural engineers: high slenderness of its resulting cross-sections and the uncertainty of results caused by the increased difficulty of a thorough calculation of the resistance to lateral-torsional buckling of tapered I-section elements. If no lateral restraints, or when they are not effective enough, the lateral torsional mode characterizes the global behavior of frame members or interaction with sectional bucking modes may occur. As slenderer sections they are more sensible to buckling (local and global) as well as more sensitive to imperfections than compact sections. The paper summarizes a numerical study performed by authors on a relevant series of such type of elements. Different types of lateral restraints have been considered along with a variety of patterns of initial imperfections. A sophisticate nonlinear inelastic FEM model was built and different imperfections were used to simulate the behavior of the frames.
Local and Global Stability of I Steel Members with Tapered Web via Advanced Nonlinear Analysis
Authors: Cristutiu Ionel Mircea , Dogariu Adrian Ioan
Published: June 2013

Steel structural elements with variable cross section, made of welded plates, are largely used in the construction industry for both beams and columns in accordance with the stress and stiffness demand in the structure. These types of elements are mainly used for the design of singles storey frames with pitched roof rafters and pinned column base. Although they are partially restrained against out of plane buckling by side-rails and roof purlins cooperating with sheeting, in current design practice it is quite difficult to evaluate their influence. Present paper deals with nonlinear elastic-plastic analysis of tapered beam-columns, parts of portal frames, subjected to both bending moment and compressive axial force. Failure of such members may occur by in-plane bending, local buckling and combination between these two, for members with low non-dimensional slenderness. Numerical results will be compared with experimental tests, obtained for a relevant number of specimens, in order to check the reliability of the numerically determined ultimate capacity of the elements. The influence of both lateral and torsional restraints applied on the beam-column will also be discussed.
Chaotic Optical Communication Performance Based on Semiconductor Ring Laser
Authors: Li Yang , Yuan Guo Hui
Published: June 2013

We build up a model of chaotic optical communication based on semiconductor ring laser (SRL). The modulation and demodulation technique is numerically applied in order to demonstrate the communication performance and the security effect. The results indicate that good transmission and security performance can be achieved with the appropriate transmission data rate and modulation depth in SRL-based chaotic optical communication.
Focal Length Measurement of Lens Based on Linear Array CCD
Authors: Guo Fei , Zhao Mei , Liu Ying , Xie Jun , Han Wei
Published: June 2013

Focal length of lens is an important parameter to determine the relationship between objective and image. It must be measured accurately. The traditional method of using optical bench to measure the focal length of lens has big man-made errors. So we used linear array CCD camera instead of eyes as the receiver to measure the focal length of lens in this paper. Based on the theory of point spread function, it firstly determined the evaluation function of focal plane. With the threshold method, it determined the location coordinate of sharp signal. Then it proved the feasibility of this scheme through experiment. Finally we compared the experimental data obtained with this method with the experimental data obtained with traditional method, which showed that it was more accurate to measure the focal length of lens with this method.
Analysis on a Novel Concatenated Code for Optical Transmission Systems
Authors: Yuan Jian Guo , Li Chan Yuan , Tong Qing Zhen
Published: June 2013

A novel RS(255,239)+BCH(3860,3824) concatenated code with 7.70% redundancy for long-haul optical transmission systems is constructed and analyzed through the theoretical analysis of the relevant concatenated code. The simulation analysis shows that the novel concatenated code, compared with the RS(255,239)+CSOC(k0/n0=6/7,J=8) code in ITU-T G.75.1, has a lower redundancy and better error-correction performance. In addition, the net coding gain (NCG) of the novel concatenated code is respectively more 0.44dB and 0.47dB than that of BCH(3860,3824)+ BCH(2040,1930) code and RS(255,239)+CSOC(k0/n0 =6/7, J=8) code in ITU-T G.75.1 at the third iteration for the bit error rate (BER) of 10-12. As a result, the novel concatenated code can be better suitable for long-haul optical transmission systems.
Simulation Research on One-Cycle Controlled AC-AC Cuk Converter
Authors: Wang Chun Jie , Yu Peng Fei
Published: June 2013

AC-AC Cuk Converter which constituted by bidirectional switch has an advantage of high transmission efficiency, but most of them usually use open-loop control. In this paper, we propose one-cycle control of the AC-AC Cuk converter. The operating principle and control method are presented. The simulation results based on Matlab are given to verify its rationality and feasibility. Compared to common PID control, it has excellent control performance. Furthermore, one-cycle controlled AC-AC Cuk converter has the ability to reject input voltage perturbations and faster dynamic response.
Improved PSO Based Feedback Control Algorithm in the Application of PMD Compensation System
Authors: Chen Ying , Zhu Qi Guang , Bi Wei Hong
Published: June 2013

An feedback control algorithm based on improved particle swarm optimization algorithm for adaptive polarization mode dispersion (PMD) compensation has been proposed. In order to achieve the global optima of DOP, the aggregating index has been adjusted to maintain the global searching capability of PSO. The immune clone principle has been adopted to maintain the diversity of the swarm. Compared the eye diagram before and after compensation, the opening of the eye diagram has been improved obviously, which demonstrated the effectiveness of the IPSO based feedback control algorithm..
The Research on Human Simulating Intelligent Control of the Inverted Pendulum Based on Feedback Linearization
Authors: Zhang Ling , Hu Shi Zhong
Published: June 2013

In this paper, the partial feedback linearization was made for the non-linear model of the triple inverted pendulum, by means of the differential geometry. Then the simulation and analysis of tracking control and interference control were made, which combined with the human simulating intelligent control and LQR control in the system. The results show that the human simulating intelligent control can achieve better control results than the LQR control, it not only can effectively improve the stability of the system, but also the anti-interference ability is better than LQR control, it meets the control requirements of the triple inverted pendulum.
Detection of Single-Phase Grounding Fault Line Based on Fuzzy Set Theory
Authors: Wang Jun Fen , Liu Pei Yue
Published: June 2013

The complex single-phase grounding fault is researched in neutral insulated or Peterson coil earthed power networks. Traditional single fault line detection method only using some parts of fault information has poor adaptability and reliability. In this paper fuzzy set theory is introduced and applied in fault line detection. By setting subordinate functions and intelligently fusing all kinds of the fault information and all fault detection methods the property of detection is improved..It has shown that this fusion strategy exhibits excellent property over the existing criteria by dynamic mould laboratory emulation.
Classification of Apple Using near Infrared Spectroscopy Based on Fuzzy Discriminant Analysis
Authors: Wu Xiao Hong , Wan Xing Xing , Wu Bin , Wu Fan
Published: June 2013

Classification of apple is an important link in postharvest commercialization processing. To realize the non-destructive, rapid and effective discrimination of apple fruits, the near infrared reflectance spectra of four varieties of apples were collected using near infrared spectroscopy, reduced by principal component analysis (PCA) and used to extract the discriminant information by linear discriminant analysis (LDA), quadratic discriminant analysis (QDA), fuzzy discriminant analysis (FDA) and Foley-Sammon discriminant analysis. Finally k-nearest neighbor finished the classification. The classification results showed that FDA could extract the discriminant information of NIR spectra more effectively, and achieved the highest classification accuracy.
Boundary of Crop Detection Using a Laser Scanner
Authors: Zhao Teng , Chen Jun , Mu Jun Ying
Published: June 2013

The crop boundary detecting becomes more and more significant in the navigation of agricultural vehicle. In this paper, on the basis of making full use of laser ranging principle, a field information collecting system is developed, using a Sick LMS291 as the main sensor. A Kubota combine harvester plays as the platform for the system, and a VC++ program and a MATLAB program are used in data processing. A series of experiments have been conducted, and the results demonstrate that the algorithm can detect the demarcation point correctly, which provide both theoretical and practical basis for the agricultural mechanical automation.
Automatic Tracking Tunnel Cables Using Egomotion Estimation
Authors: Liu Chang An , Sun Zhe , Wu Hua , Yang Guo Tian
Published: June 2013

We proposed an online method of tracking the tunnel cable based on egomotion estimation. The method is firstly applied key point detection algorithm to extract feature points, and then the points are matched to estimate the matrix of egomotion representing the camera movement. Finally, we use the matrix to locate a mask around the cable in each frames captured inside the power line tunnel. The experimental results show robustness and efficiency of our method.
A Novel Partitioning Algorithm for Power Grid Using Community Detection
Authors: Wang Tao , Zou Pan , Zhou Heng
Published: June 2013

This paper proposes a novel partitioning algorithm based on angles between vectors using community detection theory. Considering the physical properties of the power system, the weighted modularity matrix of power grid is constructed and modified to a non-negative definite matrix which can be an orthogonal matrix by orthogonal decomposition. Thus transform the community detection problem as a vector partitioning problem which can be solved without decomposing the modularity matrix or even computing the vertex vector explicitly either. A novel partitioning algorithm based on merging vectors with least angle is designed. The algorithm is applied to partition IEEE 39-bus system, and the results demonstrate the validity of our algorithm.
An Adaptive Regularized Fast Iterative Shrinkage-Thresholding Algorithm for Image Reconstruction in Compressed Sensing
Authors: Meng Xin , Duan Shi Fang , Ma She Xiang
Published: June 2013

Aiming at the problems of worse reconstructed image quality and larger time complexity of the fast iterative shrinkage-thresholding algorithm in compressed sensing, this paper presents adaptive regularized fast iterative shrinkage-thresholding algorithm. This algorithm brings in the idea of adaptively selecting regularization parameter on the basis of using gradient method and threshold shrinkage to minimize the objective function. During the iteration process regularization parameter is adaptively selected from the whole value in order to adjust the proportion of the former part and the latter part of the objective function value. Simulation results show that the proposed algorithm, compared with the traditional algorithms, obtains the better reconstructed image quality and lower time complexity.
A Rough-Fuzzy RBF Neural Network Based on PSO Algorithm
Authors: Zhao Jing
Published: June 2013

A Rough-Fuzzy RBF Neural Network was raised based on PSO Algorithm. In this model,gives a knowledge acquisition method that based on rough set theory,the Rough-Fuzzy RBF neural network are constructed according to the results of the knowledge acquisition,the PSO are used to optimize the network parameters.This paper take number plate for example to conduct a simulation experiment.The results shows that the model can simplify the network training sample,optimize the network structure and enhance the systems study efficiency and the precision.
An Improved SDIF Radar Pulse Signal Main Sorting Algorithm
Authors: Xiao Wei Hua , Wu Hong Chao , Yang Cheng Zhi , Wang Mei Ling
Published: June 2013

In repetition frequency sorting method, sorting capability of the sequence of the difference histogram method (SDIF) to the PRI jitter radar pulses is poor. Although the PRI transform method can sort PRI jitter radar signal, the amount of computation overlarge is difficult to meet the demand for real-time sorting. Because of the poor sorting capability of SDIF algorithm to jitter PRI, this paper presents an improved algorithm of SDIF, sorts PRI jitter radar signal well, can meet the needs of real-time sorting.
Research on Algorithm of Boolean Function Isomorphism Decision Based on ROBDD
Authors: Li Hong Yan
Published: June 2013

As an indispensable tool in cryptosystem design and analysis, Boolean function has always been one of important issues. Isomorphism decision of Boolean function has wide applications. However, how to determine the isomorphism of Boolean functions is NP-hard problem. In this paper, an algorithm of determining Boolean function Isomorphism based on ROBDD is presented, which can effectively solve problem of Boolean functions Isomorphism decision.
A New AVS Loop-Filtering Fast Algorithm
Authors: Zhang Xi Nan , Gong Yan Jun
Published: June 2013

To reduce the complexity of AVS loop-filtering algorithm, this paper proposes a new AVS loop-filtering fast algorithm based on boundary flatness on the basis of deep analysis to AVS loop-filtering algorithm. Comparing with loop-filtering datum algorithm, the time of s loop-filtering algorithm can reduce 53.69% on average, which can efficiently decrease the computational number of loop-filtering algorithm and improve coding speed on average PSNR decreasing 0.011dB to the video sequences with different motion characteristics.
An Improved Intrusion Detection Model Design
Authors: Wang Zong Jiang , Li Xiao Bo
Published: June 2013

In order to improve the design of intrusion detection model, this paper according to the analysis of generic intrusion detection model and intrusion detection model based on data mining, design for intrusion detection intrusion detection systems based on improved fuzzy C-means algorithm, In the model, the design of each module, Detailed description of the various parts and the parts functions of the model, and finally the feasibility of the model were analyzed. This method is effective to solve the problem of false detection rate in intrusion detection system, so that the performance of intrusion detection systems has a greater improvement.
An Exact Algorithm for Finding K-Biclique Vertex Partitions of Bipartites
Authors: Liu Pei Qiang
Published: June 2013

Biclustering has been extensively studied in many fields such as data mining, e-commerce, computational biology, information security, etc. Problems of finding bicliques in bipartite, which are variants of biclustering, have received much attention in recent years due to its importance for biclustering. The k-biclique vertex partition problem proposed by Bein et al. is one of finding bicliques problems in bipartite. Its aim is to find k bicliques (kk) such that each vertex of the bipartite occurs in exactly one member of these bicliques. First, we give a sufficient condition of the k-biclique vertex partition problem. Moreover, we present an exact algorithm for finding k-biclique vertex partitions of a bipartite. Finally, we propose a method to generate simulated datasets used to test the algorithm. Experimental results on simulated datasets show that the algorithm can find k-biclique vertex partitions of a bipartite with relatively fast speed.
Effect of Sintering Temperature on the Oxygen Adsorption Property of Ba0.8Sr0.2Fe0.5Co0.5O3-δ
Authors: Wang Meng Ni , Yu Dan Dan , Jun Qiao , Huang Xiang Hong
Published: June 2013

A serial of Ba0.8Sr0.2Fe0.5Co0.5O3-δoxides were prepared by the citrate method and sintered at different temperatures from 400°C to 900°C. The mass loss of various samples with elevated temperature was characterized by TGA analysis. The results indicated that several kinds of compositions lost from the samples in the elevated temperature process. The oxygen adsorption capacity of these samples over a temperature range of 200-900°C were calculated by the data of TGA experiment. The sample sintered at 400°C exhibited the best oxygen sorption ability.
Based on Artificial Neural Network Simulation of Alloy Finite Element
Authors: Zhang Shu
Published: June 2013

Artificial neural networks are composed of interconnecting artificial neurons (programming constructs that mimic the properties of biological neurons). Artificial neural networks may either be used to gain an understanding of biological neural networks, or for solving artificial intelligence problems without necessarily creating a model of a real biological system. First modal analyses of microstructure defects are performed in ANSYS. Second the genetic algorithm is implemented in MATLAB to Calculate the Value of b and p. The last, The FEM analysis results are imported in ANSYS about the Stress distribution. The result presented in this paper is obtained using the Genetic Algorithm Optimization Toolbox.
3D Model Optimization in Virtual Equipment Operation Simulation System
Authors: Liao Jian Hua
Published: June 2013

For solving difficulty of running sluggishly and system overload in 3D simulation based equipment operation simulation system, 3D model optimization technologies including polygon simplification, instance reference and LOD are adopted combing with system characteristics of EOSS. Finally, 3D model optimization examples consists of single equipment and integrated equipment are also presented to prove its feasible and effective.
Exploring Agent-Based Modeling for Emergency Logistics Collaborative Decision Making
Authors: Zhang Li , Qi Zhi , Cui Hao , Wang Sen Hua , Ning Ya Hui , Wang Qian Zhu
Published: June 2013

Aiming at the requirements of urgency and dynamics in emergency logistics, this paper presents a multi-agent system (MAS) concept model for emergency logistics collaborative decision making. The suggested model includes three kinds of agents, i.e., role agent, function agent and assistant agent. Role agent excutes emergency logistics activities, function agent achieves the task requirements in every work phase and assistant agent helps organizing and visiting data. Two levels agent views serve as the basic skeleton of the MAS. Top level is the global decision-making view, which describes the task distribution process with multiple agents. Local level is the execution planning view, which simulates task executing process of the performer. Finally, an extended BDI agent structure model is proposed to help the implementation at application level.
Refractive Index Estimation of Nanoporous Silicon in Visible and Near-Infrared Spectrum Range
Authors: Qiang Wei , Xia Jin An , Wang Chun Rui , Zhang Xiao Yan
Published: June 2013

In this paper, we use Bruggeman model to calculate refractive index of nanoporous silicon, which was fabricated by electrochemical etching. The calculated result shows that the refractive index of the nanoporous silicon decreases linearly with increasing porosity and etching current density. In addition, the refractive index of nanoporous silicon was also measured by spectroscopic ellipsometry in the visible light spectrum range. The measured refractive index and extinction coefficient were in agreement with the calculated data, after being modified by the refractive index modified model of heavily doped silicon. In particular, we estimate the refractive index at the optical wavelengths in visible and near-infrared spectrum ranges, which may be widely used in various types of optical sensors and optoelectronic devices for optical communication systems.
Rationality Fuzzy Comprehensive Evaluation of Mining Ventilation System
Authors: Miao Lei Gang , Niu Yuan Yuan , Yu Dian Bao
Published: June 2013

Each influence factor had the obvious fuzzy characteristic in view of the mine ventilation system, the utilization fuzzy mathematics method has established one kind of new ventilation system rationality fuzzy mathematics judgment model, carried on the synthesis judgment to the ventilation system rationality, this judgment method could give the quota description direct-viewing to the system rationality. Finally, take some mining bureau's four ore as the example, has confirmed the model rationality. This method may operational strong, the effect be better, may in the general mine ventilation system appraisal the widespread application.
Influence of Heat Treatment on Microstructure and Mechanical Properties of Cr8Mo2SiV Cold Work Die Steel: A Comparison with Cr12MoV Steel
Authors: Li Shao Hong , Min Na , Li Jun Wan , Wu Xiao Chun
Published: June 2013

Microstructure and mechanical properties of a new developed cold work die steel (SDC99) were investigated under solution treatment and comparison with Cr12MoV steel. The new developed high strength and high toughness cold work die steel has overcome the weakness of Cr12MoV which failed with tipping, fracture and collapse in services due to low toughness. The toughness achieves to 80J which is twice as Cr12MoV while the hardness is 62HRC.
Effect of RE Addition on Microstructure and Properties of As-Cast Mg-6Zn-Zr Alloy
Authors: Lee Seung Jin , Park Joon Sik , Kim Jeong Min , Kim Ki Tae
Published: June 2013

Typical as-cast microstructure of the MgZnRE-Zr alloys consists primarily of Mg matrix, MgZn and MgRE phases. Although the electrical conductivity was a slightly reduced by Ce-rich RE addition, the conductivity was remained high. Microhardness at room temperature and tensile strength at 200°C were clearly enhanced by the addition. Fluidity as mold filling ability was observed to increase significantly with the RE addition partly due to reduced grain size and solidification range, however the corrosion resistance predicted from polarization curves was little decreased.
A Study of the Sensitivity of Parameters Affecting Surface Roughness in High Speed Milling Superalloy GH4169
Authors: Liu Wei Wei , Wan Xu Sheng , Li Xiao Yan , Yu Yuan , Wang Dong Fang
Published: June 2013

The orthogonal experiment is processed for high-speed milling superalloy GH4169 with TiAlN coated carbide inserts. The empirical formula of the surface roughness is acquired by using Genetic Algorithm method. On the basis of this formula, studying the absolute sensitivity and relative sensitivity of surface roughness for milling speed, depth of cut and feed; The results showed that in the process of high-speed milling of high-temperature alloy GH4169, Surface roughness is most sensitive to the change of milling feed; change of milling depth take second place and milling speed is the least sensitive.
Monosaccharides in Sulfuric Acid Hydrolysate of Corn Stalk
Authors: Wang Wen Bo , Kong Fan Gong , Wang Shou Juan , Zhong Ya Jie
Published: June 2013

There are lots of corn straws left on the farmland every year in China. At present, the technologies of taking full advantage of corn stalks are not mature. In this paper, the method of acidic hydrolysis was used to decompose hemicellulose of corn stalk into xylose, L-arabinose, fructose, etc. HPLC was used to detect the concentration of monosaccharides in the hydrolyzate, at the same time the hydrolysis conditions were also optimized. The results showed that the optimum conditions were: the concentration of corn stalks 15%, hydrolysis time 3h. There were xylose, L-arabinose, fructose and glucose were detected in the hydrolyzate of corn stalks. The max concentration of xylose 23.1mg/ml was obtained at temperature about 160°Cand the max concentration of L-arabinose 19.4mg/ml was obtained at a relatively low temperature 130°C. As the temperature rising, the concentration of glucose was increased at first and then decreased; the concentration of fructose was increased in a small range in the whole range of temperatures investigated.
Preparation and Drug Release Behavior from a Temperature-Sensitive Poly(aspartic Acid) Derivatives Hydrogel
Authors: Deng Kui Lin , Li Chun Xiu , Gao Ting , Fu Xiao Dan , Jin Wen Hui , Shen Hui Juan , Fan Xue Ying , Ma Xin , Wang Meng
Published: June 2013

In this paper, a new pH/temperature-sensitive beads with semi-interpenetrating polymeric network based on sodium alginate(SA) and poly(aspartic acid) derivatives(M-E-PSI) were prepared using as drug delivery carrier. With indomethacin as a drug model，we investigated the release behaviors of indomethacin in different pH value, temperature and ratio of SA/ M-E-PSI. It turned out that the release amount of indomethacin in pH=2.1 phosphate buffer solution(PBS) was evidently higher than that in pH=7.4 PBS. And also, the release amount of indomethacin was also increased with increasing temperature and poly(aspartic acid) derivatives content in the beads.
The Study of Technology on Co-Carbonization for Biomass and Coal
Authors: Wu Wen Rong , Yang Xiao Min , Tang Qing Jie
Published: June 2013

A series of biomass moulded coal were preparation by cow dung and brown coal as raw material. The effect of Na2CO3 NaHCO3 NaOH and KOH were studied on Ignition loss rate and Iodine adsorption value in the process of carbonization for biomass moulded coal. The result showed that the effect of Na2CO3 and NaHCO3 were obvious than NaOH and KOH in the ignition loss rate, but the effect of NaOH and KOH were obvious than Na2CO3 and NaHCO3 in the Iodine adsorption value.
The Role of Oxygen Ambience on the Optical Characteristics of ZnO Films
Authors: Li Feng , Ma Ru Yuan
Published: June 2013

Zinc oxide (ZnO) films are grown by two methods-pulse laser deposition (PLD) and radio-frequency magnetron sputtering at various oxygen ambiences. Based on x-ray diffraction spectra and photoluminescence (PL) spectra, effects of the oxygen ambient on the grain size and emission properties of the ZnO films are investigated. For the samples grown by PLD, the PL spectrum consists of a single ultraviolet (UV) peak except one sample deposited at a low O2 pressure of 7 Pa. All the samples grown by sputtering have both a UV peak and a green emission. The disappearance of the green emission of the PLD samples is ascribed to deficiency of oxygen vacancies (Ov), and the green emission of the sample grown by sputtering is due to abundant Ov. The intensity change of the UV emission is due to the variation of exciton emission, which is related to grain size and stoichiometry. The position shifting of the UV peak of the PLD samples originates from the Zn interstitial-related degradation of stoichiometry.
Development of a Molded Case Circuit Breaker with a Spring-Actuated Linkage Based on Multi-Body Dynamics Analysis
Authors: Kim Young Shik , Ryu Bong Jo , Ahn Kil Young
Published: June 2013

In this research we present multi-body dynamics analysis can be applied in product development using a case study of a Molded Case Circuit Breaker (MCCB) with a spring-actuated linkage, which can save time and cost considerably. In particular, we demonstrate how to evaluate and improve durability of the MCCB based on multi-body dynamics and finite element simulation given SM45C steel used for the MCCB links. Toward this goal, a 3D MCCB dynamic model is first developed and dynamic forces are analyzed by using the multi-body dynamics software, ADAMS. Finite element simulation is then performed to examine maximum principal stresses considering deflections and dynamic loads. Further, mechanical properties of SM45C steel are measured experimentally from tensile and fatigue tests. As a result, we verify that stress loads acting on the latch pin of the spring-actuated linkage are critically higher, which ultimately leads to a low-cycle fatigue fracture of the pin. Based on our analytically estimated maximum principal stresses in the MCCB and experimentally measured mechanical properties of SM45C steel, we evaluate design durability and improve our design. As a result, using a 4 mm diameter pin and modifying SM45C with heat treating that includes quenching and tempering, we successfully achieve a MCCB product development, which provides sufficient strengths to prevent yielding and fatigue failures from repeated dynamic loads.
Computerized Generation Simulation of Straight Bevel Gears with Tangear
Authors: Li Da Qing , He Yao Min , Deng Xiao Zhong , Zhang Lu Xia , Zheng Xiao Li
Published: June 2013

In this paper, the generation theory of straight bevel gears with is studied. The movements of machine tool are first analyzed. Based on the meshing theory and differential geometry principle, the mathematic model for the generation of gears is established and the tooth surface equation of straight bevel gears is derived. Computerized simulation of generation process has been done, which lay theoretical foundation for rebuilding of machine tool.
Fatigue Research on Welding Joint of the Main Girder in Bridge Crane
Authors: Liu Nan , Xiang Dong , Mou Peng , Ren Ying , Xie Ning
Published: June 2013

Fatigue problems about large sized structure components ,such as bridge crane girder , has always been the bottleneck of mechanical products lightweight, reliability, security. In order to study fatigue problem about crane girder in the actual conditions, the dangerous spot of the girder is identified by using the finite element method to analyze structural stress. By simplified model , set up to reflect the main beam welding details of the characteristics of the small size of the process welding fatigue specimen model, and carried out a series of fatigue life test. Specimen fatigue test results quantitative descript the actual fatigue life of the bridge crane girder welded structures. By data fitting, the S-N curve equation of the bridge crane girder include the specific materials, the stress ratio, the welding process and special structure is obtained. It provides a scientific basis and practical methods to solve weld fatigue life design and the remaining life prediction about the crane girder.
Numerical Analysis on Concrete Filled Steel Tube Supports Support Technology of III-Level South Roadway in Yangzhuang Mine
Authors: Zhang Hong Ying , Li Xue Bin , Ma Zheng Xing , Wang Chao , Wang Zheng Ze
Published: June 2013

Combined with engineering conditions of the III-level south roadway of Yangzhuang Mine, the deformation of surrounding rock and mechanical characteristics of support structure is analyzed by FLAC3D numerical simulation when the roadway is supported by CFSTS support program . The results shows that: For the weak mudstone surrounding rock and complex geological conditions, the deformation of surrounding rock is fast, large and unsymmetrical deformation, the bolt-net-shotcrete support is difficult to maintain the roadway stability. the CFSTS used Φ219 ×8mm steel tube filled with C50 core concrete, which provides powerful supporting force combined with other roadway support ways and restrict surrounding rock to the roadway space. By FLAC3D simulation analysis shows, the deformation of surrounding rock is small and support structure is mad good use and keep work, which can maintain the stability of roadway.
Modeling and Simulation of Servo-Hydraulic Cylinder Systems for Multi Axis Test Control
Authors: Li Ling Jun , Thurner Thomas
Published: June 2013

Multi-axial mechanical testing with servo-hydraulic cylinders is used as essential tool within the development and manufacturing process of mechanical components and structures, enabling the experimental validation of the fatigue behavior and related mechanical endurance limits. In this paper we derive the analytical model of servo-hydraulic cylinders feasible for fatigue tests to enable the incorporation of the derived actuator dynamics within multi-axis test control strategies. Our derived cylinder model includes the test cylinder with attached position sensor, and a state-of-the-art servo valve. Based on the obtained cylinder dynamics we propose a simplification to a low order cylinder model, highly desirable for reducing overall system complexity in order to develop ease-of-use controllers of high performance for multi-dimensional test rigs. We compare the simulated output of the derived actuator models with the measured data from a real world test cylinder system. The obtained results show that the obtained system model accurately describes the dynamic properties of a real world test cylinder, and furthermore validates the process of model simplification for efficient control of such cylinders as part of low-bandwidth multi input multi output servo-hydraulic test systems.
An Improved Greedy Algorithm for Coverage in Directional Sensor Networks
Authors: Fu Xiang , Lu Chun Ping , Li Hao
Published: June 2013

DGreedy (distributed greedy) algorithm evaluates the priority level in view of remaining energy of terminals, and the relationships between neighbor nodes are not considered. At the same time, the adjustable sensing orientations of sensors are limited. Therefore, the network coverage ratio of DGreedy is affected usually by the processing order of sensor nodes. In this paper, an improved Greedy algorithm for the coverage in directional sensor network is proposed based on the principle of global greedy. The single coverage area of nodes is considered as priority. The direction of node with maximum single coverage area is deployed firstly. Thereby it reduces the sensing overlapping regions and accomplishes coverage enhancement of the networks. Meanwhile, in order to improve the network coverage ratio, the sensing orientations of sensors are adjustable continuously, so the best sensing orientation of node can be selected by considering the deployment of neighbor nodes. Simulation experiments show that the proposed algorithm can improve the coverage area effectively.
A Compact Mechanical Gripper System for Meso-Scale Parts Using a Ball-Roller Joint
Authors: Wang Wei , Lee Dong Mok , Lee Hoon Hee , Lee Sang Ryong , Yang Seung Han
Published: June 2013

In this paper, a compact gripper system is designed to pick up meso-scale parts. A mechanical gripping method is chosen with a new type of joint. Based on the kinematics and material mechanics, the gripper motion is analyzed. Finally, a prototype gripper system based on the design and analysis results is fabricated. The motion principle is checked using laser diodes and position sensing detectors.
Research on a Hub Hydraulic Motor Driving System of Electric Vehicle
Authors: Wang Bin , Lin Xin Yan , Li Shi Heng , Zhang Bin
Published: June 2013

This paper applies hydraulic transmissions advantages of small volume, light weight, quick response, stable transmission, great transmission torque and agile spatial arrangement etc. to hub electromotor drive electric vehicle, substitutes hub hydraulic motors for hub electromotors, propose a hub hydraulic motor driving system of electric vehicle. The constitution and working principle of system is then described in detail. The hub hydraulic motor driving system proposed in this paper will help electric vehicle to realize continuously variable transmission, leave out reducer and differential mechanism, reduce the unsprung mass of electric vehicle, make the spatial arrangement of electromotors and batteries more flexible, and achieve the integration control of electric vehicles driving, braking and steering.
Study on Fuzzy Semantic Controlling for Machinery and Equipment Manufacturing
Authors: Sun Heng , Cai Shu Bin , Joseph Massawe Richard Happson , Chen Ling
Published: June 2013

Machinery and equipment descriptions play an important role in the design and manufacturing of industrial machinery devices and help reducing the design time and manufacturing costs of machinery devices. However, one of the main obstacles to realize efficient device design and manufacturing is the lack of effective semantic description method because of the surprisingly increasing volume and semantically fuzzy natures of the industrial device descriptions. To overcome this problem, this paper presents a novel fuzzy ontology-based device description method and implements the intelligent device retrieval and representation system based on the fuzzy ontology. The fuzzy inference and semantic fusion mechanisms of this approach are demonstrated.
The Human-Robot Interaction: An Investigation of Rescue Robot
Authors: Su Wei Hua , Sun Jing Gong , Niu Fu , Xu Xin Yue
Published: June 2013

The thesis research aimed to further the study of human-robot interaction (HRI) issues, especially regarding the development of rescue robot. The paper firstly discussed the status of the rescue robot and described the framework of human-robot interaction of search-rescue robot and rescue-evacuation robot. Subsequently, the general HRI issues will be discussed to explain how they affect the use of robots. Finally, we present suggested this multidisciplinary field of research, namely human-robot interaction, requires contributions from a variety of research fields such as robotics, human-computer interaction, and artificial intelligence.