bluuebunny/crossref_metadata_2025 huggingface dataset:
Combined Iteration Method of Load Identification for a Complex Structure with Nonlinearity
Authors: Liu Yu Hua , Li Zhi Jun , Zhou Xue Feng , Hou Wei
Published: February 2012

A combined iteration method of load identification method is presented concerning one type of structure with nonlinearity. The proposed method realizes the load identification of the nonlinear dynamical system by combining and iterating the finite element method and the active control method. The finite element models of nonlinear dynamical systems are firstly contracted into the simplified model to make up the controlled plant. Then under the selected control law, the controller is designed to produce the system excitation, namely the identified load. The validity of the load is finally checked through the response of the nonlinear finite element model. For a conical shell-belting combined system, the numerical study regarding the load identification demonstrates the validity of combined iteration method, which can plays a guiding role in the load identification of vibration test respecting aerospace structures, such as missile, aerospacecraft, aerospaceplane, rocket and so on, making great contribution to the development of the aerospace industry.
Study of the Parallax Correction Algorithm Based on the Multiple Regulatory Factors
Authors: Sun Jun , Lu Bing , Wu Xiao Hong , Li Jun Ming
Published: February 2012

Binocular recognition extracts bitmap information based on different viewpoints of two horizontal lines. If it is not appropriate enough to deal with the left and right images, the computation of two images' horizontal parallaxes and vertical parallax will bring on the error. This article proposes one kind of effective algorithm that adjusts the image to be right based on traditional displacement correction algorithm, and completes the image remodeling through the two pairs of matching feature points and detection of the correlation distances. Experimental results show that the method can adjust the horizontal and vertical parallax effectively, so that the displaying effect of the stereoscopic image achieves best.
Research on Feature Selection for Imbalanced Problem from Fault Diagnosis on Gear
Authors: Liu Tian Yu
Published: February 2012

Defect is one of the important factors resulting in gear fault, so it is significant to study the technology of defect diagnosis for gear. Class imbalance problem is encountered in the fault diagnosis, which causes seriously negative effect on the performance of classifiers that assume a balanced distribution of classes. Though it is critical, few previous works paid attention to this class imbalance problem in the fault diagnosis of gear. In imbalanced problems, some features are redundant and even irrelevant. These features will hurt the generalization performance of learning machines. Here we propose PREE (Prediction Risk based feature selectionfor EasyEnsemble) to solve the class imbalanced problem in the fault diagnosis of gear. Experimental results on UCI data sets and gear data set show that PREE improves the classification performance and prediction ability on the imbalanced dataset.
Research on MPPT of PV Systems Based on BP Neural Network
Authors: Chen Wen Ying , Lin Yong Jun , Liu Wei Liang , Liu Shuang Sai
Published: February 2012

In order to obtain more output power of photovoltaic (PV) array, which depends on solar irradiation and ambient temperature, maximum power point tracking (MPPT) techniques are employed. Among all the MPPT strategies, the Perturb and Observe (P&O) algorithm is more attractive due to the simple control structure. Nevertheless, steady-state oscillations always appear due to the perturbation. In this paper, a new MPPT method based on BP Neural Networks and P&O is proposed for searching maximum power point (MPP) fast and exactly, and its effectiveness is validated by experimental results using hardware platform based on microcomputer.
Dynamic Position Accuracy Analysis of Paper-Converying Grippers in Die-Cutting Machine
Authors: Wang Fang , Chen Hong
Published: February 2012

Each component of die-cutting machine at high speed may produce vibration and die-cutting quality would be affected in different degrees by direct or indirect vibration. Position accuracy of paper-conveying grippers may be an important influencing factor. Under some suitable hypothetical conditions, single degree of freedom no-damp dynamic model was established based on transferring principle of mass and stiffness equivalence and principle of equivalent substitution. Position process has been discussed at high speed, dynamic displacement deviationresponse spectrum has been gotten by numerical computation method in cam resting rang. The result of the analysis and computation shows that position error has an increasing tendency with the increase of the working speed. So it is vitally necessary that the maximum speed of die-cutting machine must be limited to meet die-cutting accuracy requirement when natural frequency of the machine is known.
Magnetic Field Analysis of Surface-Mounted Permanent Magnet Motors Using Schwarz-Christoffel Mapping
Authors: Lu Xiao Hui , Liang Jian Hong
Published: February 2012

The paper presents the magnetic field distribution from the armature winding currents in the slotted air gap of surface-mounted permanent magnet (SMPM) motors using the Schwarz- Christoffel(SC) mapping. With the method, a slotted structure of SMPM motors is transformed into a geometrically simpler domain. Compared with the result from the finite element method, the accuracy of the method is verified. The presented work can be a basic tool for optimizing design and performance analysis of permanent magnet motors.
The Aircraft Surface Movement Behaviors Modelling and Analysis Using Petri Net
Authors: Wang Jie Ning , Jiang Gao Yang
Published: February 2012

The description of aircraft surface movement behaviors at airdrome is the key issue of control and scheduling simulation which aims to solve the surface traffic activities problems. Using the Petri Net theory and CPN Tools to build hierarchical and timed Petri Net of aircraft taxing, prescribed the entire progress of aircraft from apron service to takeoff in order to achieve flexible random route allocation and normal orderly operation.
Selection and Research about Mutational Ratio in the Test of Pipeline Section with Scattering Sensor
Authors: Wang Jian Xin , Wang Cheng Yuan
Published: February 2012

The test analyses eight different pipe section of mutations, from reasonable test environment, to find actual pollution laws of embedded sensor lens after washing blow[1]. And then concluding Its Regularity about a different effect of different D1 / D2 mutational ratio and sensor lens protection effect of the law, which is on the basis of Selection and research by Test data and the theoretical analysis, will provide the reference in actual working of the reasonable choice.
The Double-Bridge Beam Structure with Slots for Microaccelerometer
Authors: Lu Sun , Zhao Yu Long , Liu Yan , Gao Xin Hao
Published: February 2012

Aiming at the increasingly demanding needs for high sensitivity and high response frequency, a novel accelerometer chip structure is proposed based on the improvement of stress distribution of the traditional double-bridge beam structure. Analysis and simulation proved that the double-bridge beam structure with slots, named as DBBS structure, got a better sensitivity and a satisfactory natural frequency compared with the double-bridge beam structure. The detailed fabrication processes were studied. Finally, faith of the prospective of the DBBS structure could be paid for the future applications in failure diagnosis, automobile detection, sports equipments and so on.
The Effect of Al2O3 Concentration on Properties of Ni-W-P-Al2O3 Electroless Composite Coating
Authors: Sun Wan Chang
Published: February 2012

Ni-W-P-Al2O3 electroless composite coating was successfully co-deposited on 45 steel substrate using electroless plating. Optical microscope (OM), micro-hardness tester and potentiodynamic polarization were used to analyze the morphology, micro-hardness and corrosion resistance of the composite coating. The effect of Al2O3 concentration in the plating solution on the micro-hardness and corrosion resistance of the composite coating was mainly discussed. The results show that Al2O3 particles co-deposit with Ni-W-P homogeneously. The micro-hardness and corrosion resistance of the coating are improved with the increasing of Al2O3 concentration in the plating bath, and then decrease at a high Al2O3 concentration.
The Predicting Life of Automobile Gear by Dry Machining
Authors: Yu Lei , Wang Hua , Li Wei Wei
Published: February 2012

High speed dry cutting gear reliability life test in the presence of the test cost, sample need more, experiment analysis work tedious and complex and difficult to obtain data from all the problems, this article discusses the use of grey system theory based on GM (1, 1) model fitting of automobile gear reliability life test data method, grey models can be based on the experiment less data predict the life of automobile gear test follow-up data. Instance calculation shows. The precision of the model with residual test, after test and correlation test requirements, calculation value and actual measuring value degree of good, can be satisfy the test requirements.
The Research on the Electronic Supervision of Drug Distribution System Control
Authors: Dong Xiao Ning , Lin Zi Kui , Dong Zi Sheng
Published: February 2012

Drugs are essential commodities for people to maintain health and prevent diseases. Drugs distribution is an essential process to ensure that drugs are transferred from production processes to consumers. The traditional supervision mode has backward technology, inefficient supervision, and supervision precision rough; with the development of electronic communications technology and the promotion of new health care reform, the new drug electronic supervision has emerged. The paper use control theory for drugs distribution system to build a control model of drug distribution system. Drugs electronic supervision achieves real-time supervise and feed forward control for drug distribution, the implementation of the distribution process in the drugs electronic supervision for the government is to improve supervision quality, and for enterprises is to standardize quality management, safeguard the legitimate rights and interests of individuals are of great significance.
Study on Temperature Induced Head Skew Error for Hard Disk Drivers
Authors: Ge Xiao Yu , Xiao Yong , Guo Ren Chun
Published: February 2012

When the disk is assembled into the hard disk base, it will introduce additional head position error and timing error comparing with in-situ disk writing technology. Head skew calibration is one of the key processes to ensure high servo performance during head switching seeks. The head skew has AC and DC components. In this paper, principle of DC head skew error is formulated, and temperature characteristics of the DC head skew error are analyzed. Then a compensation method for the temperature induced DC head skew error is proposed, so that temperature induced head skew error for hard disk drivers could be adequately compensated. Experimental results demonstrating the effectiveness of the compensation scheme are given.
Ultrasound Multipath Signature of Material Flaw Depth with Single Mono/bi-Static Measurement
Authors: Shen Xi Zhong , Yuan Kui
Published: February 2012

Ultrasonic signature of flaw is studied in the multipath scene, and a method is developed to localize the flaw by only single mono/bi-static measurement. A signal model based on the concept of multipath is built to construct flaw position, of which multipath scenarios are reviewed for signature of flaw depth. Multipath scenarios may be identified by direct path, which is relatively easy to be detected. Algebraic solution is proposed to solve the multipath equations to obtain the position of the flaw depth. Experiments show that the solution of the flaw depth is valid.
Direct Orthogonal Marginal Fisher Analysis
Authors: Lin Yue , Li Jing Zhao , Liang Xing Zhu
Published: February 2012

The recently proposed Marginal Fisher Analysis (MFA) achieved high performance for face recognition. However, MFA suffers from the small sample size problem and the optimal basis vectors obtained by the MFA are nonorthogonal. In this paper, we present a new method called Direct Orthogonal Marginal Fisher Analysis (DOMFA), which is able to extract all the orthogonal discriminant vectors simultaneously in the high-dimensional feature space without pre-processing using PCA and does not suffer the small sample size problem. Experimental results on ORL database indicate that the proposed DOMFA method achieves better recognition rate than the MFA method and some other orthogonal feature extraction algorithms.
The Optimization Design of the Mill Hydraulic Loading System
Authors: Ji Xiao Bin , Qi Xue Yi , He Jian Jun , Wu Yong Li
Published: February 2012

Through the deep analysis of its working principal and the structure, the hydraulic loading system was designed, and the optimum method of the mill hydraulic loading system was researched. After the optimization it is not only that the proper coal granularity was ensured and the remote control capability got enhanced, but also resolved the problem of high pressure of the hydraulic system, and reduced the energy and consumption.
Stiffness Analysis of 6-SPS Parallel Manipulator
Authors: Li Shu Jun , Meng Qiao Ling
Published: February 2012

The analytical stiffness equations of 6-SPS spatial parallel manipulator were deduced based on the Conservative Congruence Transformation (CCT) stiffness matrix. The stiffness mappings of the 6-SPS manipulator were given to show the change and behavior of the stiffness with external forces acted on the manipulator. The results show that the stiffness of the 6-SPS manipulator is configuration dependent, and proportional to the actuating forces and joint stiffness. The stiffness is correlates not only to the magnitude of external forces but also the direction of the external force acted upon.
Synthesis of N-Butyl Acetate by Continuous Catalytic Distillation with Ionic Liquid [Hnmp]HSO4
Authors: Ma Jiang Quan , Gan Xiao Bing , Wei Ke Nian , Hu Zhi Quan
Published: February 2012

N-methyl pyrrolidonium hydrosulfate ([Hnmp]HSO4) was synthesized and characterized. N-butyl acetate was synthesized from acetic acid and n-butanol with [Hnmp]HSO4 as catalyst in a catalytic rectification column 30 mm in diameter and 2.5 m in height. Effects of catalyst dosage, bottom temperature, feeding ratio of acetic acid to n-butanol, feeding method and reflux ratio on esterification and rectification were investigated. Under optimal condition which taking both energy cost and product quality into account: catalyst dosage was 0.5% of feed weight, bottom temperature was 120 °C, mole ratio of acetic acid to butanol was 1:1.2, acetic acid and butanol were mixed and fed above second section of packing, feeding rate was 150 mL/h and reflux ratio was 4, mass fraction of n-butyl acetate in bottom could reach 92.49 %.
Research on X-Band Weather Radar Network Based on Sensor Grid
Authors: Li Chen
Published: February 2012

Monitoring of precipitation using X-band weather radar systems is becoming popular. X-band weather radar network, as an additional equipment of China new generation weather radar, primarily used to measure weather echo within 3km above the ground and has a high prospect. The network, based on sensor grid, is greater information advantage and network advantage. This paper describes the design, the key technology and implementation of an architectural framework of the weather radar network based on sensor grid. The results show that the network works robustly in real time.
Vibration Control Effect Analysis on Tuned Mass Damper System Used in Urban Transportation
Authors: Li Li , Geng Chuan Zhi , Tian Ye , Yu Qing
Published: February 2012

With the development of urban transportation, vibration and noise control has attracted increasing attention. Vibration and noise level has become one of the important hallmarks of evaluating the influence of urban transportation to environment. As Tuned Mass Damper (TMD) is an effective means of vibration control, there is more and more emphasis on its research and application. Reasonably designed TMD can reduce vibration and noise caused by wheel/rail impact. So how to take into account the complex factors to improve the design of the TMD is still the important issue. TMD system is an effective structure. In order to study its vibration reduction effect, modal calculation and wheel-set drop simulation have been analyzed in this paper. Through varying the mass of TMD, the performance of vibration attenuation have been verified. The stability and performance of damping property under impact load have been confirmed by wheel-set drop simulation. Comparing the track which uses TMD and the normal one, the effect of TMD system can be testified effectively.
A Mathematic Model for Cyclic Scheduling in Robotic Cell of Molds Manufacture Processing Multiple Piece Types
Authors: Yang Yu Jun , Nie Xiao Dong
Published: February 2012

This paper considers the cyclic scheduling problem in robotic cell of molds manufacture processing multiple piece types. The objective is minimizing the cycle time. A mathematical model for the scheduling problem is established, the sequencing of pieces and robot moves are combined them naturally in this practical area. At last, the probable algorithm and experiment are proposed.
Research on Velocity Hydrophone Suspension Dynamics
Authors: Wang Peng
Published: February 2012

Research on the dynamics of suspended velocity hydrophone was achieved. Equivalent circuit model of velocity hydrophone merged in liquid was built, and the analysis of the influence on velocity measurement caused by the suspension system and its anisotropic was carried out. Result shows that nature resonance of suspension affects the band of sensor, and phase error can be reduced in several ways. Suspension anisotropy makes the sensor overestimate the magnitude of the true signal.
Study on Catalytic Performance of Supported HPW/C Catalyst for Diethyl Adipate Synthesis
Authors: Wei Ke Nian , Zhou Bin , Ma Jiang Quan , Wang Yan
Published: February 2012

HPW/C catalysts were prepared using impregnation method. The physical chemistry properties of the catalysts were characterized employing XRD and NH3-TPD.The effects of HPW loading, catalyst amount and reaction time on the catalyst performances were investigated. The results more acid content and active center contribute to the reaction performance. Under the optimal reaction conditions of 0.8g 29%(w) HPW/C as the catalyst, n(adipic acid): n(ethanol):n(toluene)=1:6:1,5h,the etherification rate was 97.3%.
The Study on Amended Method for the Measurement of Humidity with Microwave Cavity Sensor
Authors: Zhang Shu E , Li Guo Peng
Published: February 2012

While measuring the steam humidity using microwave cylindrical cavity, thanks to the thermal expansion effect of metal, the resonant frequency changes as temperature changes. Such phenomenon reduces the measurement accuracy. This paper analyses the phenomenon, and discusses an amended calculation method which will increase the test accuracy. Compared with lab test results, this amended method becomes more convictive.
Synchronization Control of Planar 2-Dof Robot with Redundant Actuation
Authors: Mi Jian Wei , Bao Hong , Du Jing Li
Published: February 2012

Considering the special characteristics of the redundant parallel manipulator, with emphasis on the variable of structure, relatively small workspace and the strong coupling relationship among arms，a synchronization control strategy is presented in this paper. Since in the feedforward ,the inertial and the coriolis matrix are designed constant according to relatively small workspace, position measurement of the endeffector in plane is ignored. Synchronization error and coupling error are introduced to reject the model errors of inertial and coriolis matrix as stated above. Using the method, the errors of driving arms may be reduced, as well as synchronization performance among axes improves. The stability of the controllers was proved by Lyapunov. Finally, experimental results show the feasibility.
Impact Electrical Property of Alkali Metal Doped ZnO
Authors: Tan Hong Ling , Jia Cong Ying , Xiang Chao , Yang Ying Xiang
Published: February 2012

Calculate the electronic structure of alkali metal ion-doped Zn crystal, based on density functional theory (DFT) first-principles plane-wave ultra-soft pseudo-potential method. Analyze the band structure of alkali metal ion-doped ZnO crystal, and the electronic density of states. The results indicated that in theory, the doping of alkali metal ions are able to form a p-type ZnO semiconductor, and introduce in the deep acceptor levels. In the actual substitution process, the dopant ions may enter the interstitial site. Thus the alkali metal ions are tending to become donor interstitial impurities. In addition, since the ionic radius of K is larger than the ionic radiuses of Li and Na. And K+ formed the minimum acceptor level (0.078eV), which is a shallow acceptor level. K+ is better than Li+ and Na+ as a dopant. In short, they are not good p-type dopants.
Model Analysis of Analysis and Evaluation about NBA Match
Authors: Liu Wen Bin , Wu Yu Jia , Li Bin , Deng Li
Published: February 2012

In the paper,we establish mathematics model of analysis and evaluation about NBA match. On the foundation of total error definition, according to actual fact, in the same area, for the sake of better reflection each ball team is stronger or weaker than other ball team in same area, we compute relative victory’s rate, and get coefficient of profit and loss, thus it makes us get a target value what can better body equity of each ball team about arrangement of match . In the model, we design zero or one programming model according to error definition .In the model,we find the method which two ball teams games are three games among same part and dissimilarity area.We get coefficient of profit and loss with matlab software ,the superior value of the east or the west,and arrangement of matchs about two ball teams with three games mutually.
Embedded Capacitive Grid Sensing Technology for Torque Measurement
Authors: Xie Rui , Ma Tie Hua , Jin Hong , Pei Dong Xing
Published: February 2012

Torque measurement of transmission shaft has problems such as signal transmission, limited installation space and signal disturbance. In this paper proposes an embedded capacitive grid torque sensor. Through a special installation the output of capacitive grid sensor is proportional to twist angle, then torque can be calculated. The two electrodes of capacitive grid sensor can be embedded into the bearing and shaft respectively that reduces installation space, to improve the testability of transmission shaft. Experiments show that capacitive grid sensor performs high reliability and is able to be used in the case of strict environmental requirements in long time.
The Pressure-Continuously-Regulating Valve Based on NC Rotating
Authors: Li Jie , Wang Ming Di , Huang Ying , Zhong Kang Min
Published: February 2012

The creative thinking of the pressure -continuously-regulating device based on a NC rotary valve is introduced. Its inner structure, operating principle and technical feature are given out. The equation that gas flow and pressure changed with the rotation angle of the valve core is provided too. Stepper motor is used as its actuating device in this creative pressure -continuously-regulating device whose basic component is the specially designed, such as valve body, valve core and some common connections. Orifice area is changed by rotating the valve core controlled with a PC-controlled stepper motor which, and then an accurate adjustment of flow rate is thus ensured. As the change of the rotation angle is continuous, the flow rate also changes continuously, so the change of the pressure must be continuous.
A Design of Multifunctional Laser Aiming Probe
Authors: Zhu Ling Jian , Qiu Zong Ming , Li Qi , Zhao Huai Jun
Published: February 2012

A multifunctional laser aiming probe applied on coordinate measurement machines was designed and presented in this paper based on half facular point optical imagery. The designing thought and operation principle of the multifunctional aiming probe’s optical system was introduced and analyzed in detail. An adaptive intensity control method was used in the circuit to adjust the laser intensity timely so that it can adapt to aiming measurement of different optical properties surface. Repeated aiming trigger experiment was conducted and the experimental results showed that the measurement repetitive standard deviation of the multifunctional probe was better than 0.5μm without any other accessorial equipment, which can be satisfied with the use requirements of CMMs. This probe with the characteristics of high detecting speed, high degree of automation and high aiming accuracy, will be expected to have the ability of free curved surface and imagery tracking aiming measurement of contour with higher speed and accuracy coincided with CMMs or other length measurement instruments and have a wide range of application prospects and a strong practical value in measuring for parts profile with a higher precision.
ELID Grinding Technology of Nano-Ceramic Scalpel
Authors: Kuai Ji Cai , Zhang Fei Hu , Liu Ya Zhong
Published: February 2012

As the grain size of nano ceramic has reached nanometer grade, it possesses high hardness, high wear resistance and high toughness. Therefore, the scalpel made by nano ceramic has the virtue of high wear resistance, good corrosion resistance, long service life, non-toxic, non-static, sharp edge and so on, but the processing of this kind of scalpel is extremely difficult. This paper prepares the nano-ceramic scalpel by using ELID grinding technology, and also studies the thickness, surface roughness, edge sharpness of scalpel. The research results show that the thickness of prepared scalpel is 0.3 mm, the surface roughness is 6-60 nm and the edge radius is 200 nm, the cutting experiment on suture shows that this scalpel can meet the requirements of international standard for medical scalpel when the cutting force is less than 0.8 N. This further proves that the ELID grinding technology is suitable for the preparation of nano-ceramic scalpel. The preparation technology and technological equipment of nano-ceramic scalpel are proposed on the basis of above achievements, and this technology possesses promising application prospect.
Embedded System Based Target Tracking
Authors: Sun Qi Yuan , Li Liu Sheng , Cao Zuo Liang
Published: February 2012

A mobile robot based on embedded system can meet the requirement of low energy cost and miniaturization. An embedded system for moving target tracking is designed in this paper. By combining with wavelet transmission, an improved algorithm of particle filter with wavelet particles is proposed for tracking maneuver target, and then a scheme of optimization is also proposed to enhance the real-time property of the system. Experimental results show that the system can be suitable for real-time target tracking applications.
Finite Element Analysis for the Stiffness and the Buckling of Corrugated Tubes in Heat Exchanger
Authors: Wang Xiao Jing , Wang Zhi Min , Wang Nian
Published: February 2012

Corrugated tubes in a heat exchanger are analyzed by using the FEA methods. And the formula how to compute single wave’s rigidity is obtained. Besides, methods of analyzing the stability of corrugated tubes under internal compressive pressure and external pressure are proposed which include characteristic value analysis and non-linear stability analysis, thus providing theory basis for the stability research of heat exchangers.
Air Filtration and Pressure Boost Technique for the Operating Room of Construction Machinery
Authors: Li Yan Xia , Hu Hao , Hu Mao Zhong , Yin Liang , Yang Dan , Qiu Shi
Published: February 2012

An air filtration and pressure boost technique for the operating room was brought forward to the construction machinery working in dust atmosphere. The constitution, rationale and design method of the air filtration and pressure boost system was introduced in details. The method was successfully used to the operating room upgrade for a small scoop-tram. A certain positive pressure differential was maintained between the upgraded operating room and the outside, which preventing the access of the outside dust to the interior room and protecting the operator.
Fast Mosaicking Panoramic Images with Parallax Scene from a PTZ Camera
Authors: Zhang Yu Shuang , Li Shu Xiao , Chang Hong Xing
Published: February 2012

This paper presents a fast panoramic mosaic algorithm from a video sequence with parallax scene taken by a PTZ camera. A new approach that uses a four-step automatic imaging mosaic, based on interest points, is proposed. The four steps are extraction of interest points, finding corresponding points in the stitching images, deriving the spatial transform matrix then image mosaic. In order to reduce the cost of searching best match of feature points, we employ SIFT-16 descriptor and the LMPs descriptor as index . Our method preserves the efficiency and accuracy of image mosaic.
Logistics Cost Control Research of FMCG Industry
Authors: Cui Xin
Published: February 2012

This article aims to reduce the logistic cost in distribution in FMCG industry. First analyzed different distribution methods then set up a valuation index system. Fix the optimization plan for the final logistic operation mode based on the evaluation of the corporation’s risk preference. Take a multinational FMCG company’s real situation as an example, set forth what setups should take to optimize the management of supply channel in detail. Finally, realize the reduction of logistic cost.
Gateway Node Design of Underground Personnel Position System Based on Wireless Sensor Network
Authors: Yong Yang , Li Yan Tao , Guo Xiu Cai
Published: February 2012

This paper presented a method that gateway node design for underground personnel position system based on wireless sensor network. After a brief introduction of wireless sensor network technology and the basic features of CC2430 chip, it described the structure, function, works of gateway node and the details of hardware and software design features of which.
Huffman Tree Visualization
Authors: Yang Xiao Bo , Chen Bang Ze
Published: February 2012

Huffman tree is also called the optimal binary tree, is a kind of weighted shortest path length of the binary tree; Huffman coding is a coding method, which is used for a lossless data compression entropy coding ( right encoding ) optimal coding method. The realization of Huffman tree visualization is of great significance, this paper uses the object-oriented method, using a complete binary tree of Huffman tree visualization, visual image display of the Huffman coding process.
Learning Visual Object Classifiers with only Positive Images
Authors: Wang Jia Bao , Zhang Ya Fei , Lu Jian Jiang , Li Yang
Published: February 2012

In this paper, a novel approach is proposed for learning visual object classifiers with only positive images. Both positive and negative examples are collected from the positive images, and the false negative examples are filtered out by the Ramp Loss function, which has a strong ability of suppressing the influence of outliers. Meanwhile, the Latent Structural Support Vector Machines are adopted to estimate the best bounding boxes due to the unavoidable annotation errors. In learning the sub-problems, an extremely fast learning algorithm, CCCP-SGD, is proposed to optimize the Ramp Loss-based SVMs based on the Stochastic Gradient Descent algorithm. Experiments demonstrate that the CCCP-SGD algorithm can reduce the computing time both in the training and predicting phases, especially with a significant speedup in training, whilst it can also yield robust generalization performance when dataset is noisy. Besides, the visual object classifiers learnt by our approach with only positive images almost have the same performance as the classifiers learned with both positive and negative examples in object detection tasks.
Microcrystalline Silicon Thin Films and Triple-Junction Solar Cells
Authors: Ren Hui Zhi , Zhao Ying , Zhang Xiao Dan , Ge Hong , Wang Zong Pan
Published: February 2012

We report on microcrystalline silicon thin films and a-Si:H/a-SiGe:H/μc-Si:H triple-junction p-i-n solar cells deposited on large-area glass substrate. Microcrystalline silicon (μc-Si:H) bottom cells were deposited at a VHF-PECVD deposition system with 40.68MHz. It is necessary to develop the uniformity of μc-Si:H thin films for large-area deposition of high-quality triple-junction solar cells. By optimizing the deposition parameters, μc-Si:H thin films have been obtained with good thickness and very good crystalline volume fractions uniformity over the whole substrates area. The triple-junction module have been successful fabricated. The best module on 0.79 m2 size substrates has an initial total-area efficiency of 8.35%.
Investigation of Attack Angle Character for Hypersonic Inlet
Authors: Cao Yu Ji , Zhang Shi Ying , Gao Peng
Published: February 2012

The comparison analysis of performance with design point has been done in view of two different inlets, which were built by uniform shock intensity and shock angle method respectively. Base on this, the attack angle performance was emphatic developed on off-design point. The numerical calculation and analysis was conducted in eight different attack angle for air inlet conditions on two kinds of inlet respectively. The result indicated that, the inlet with uniform shock intensity method has 5% much more flow coefficient than inlet with uniform shock angle, in the condition of design point. In the condition of off-design point, the influence of the inlet performance is relatively small to the later kind of inlet with the increase of positive attack angel.
Marking Certification of Adaptive Probability Packet Based on Hash Function
Authors: Wang Yan Hua , Xu Xiu
Published: February 2012

Denial of Service Attack is a very important security event in the current network security .Address the problem of DDoS Network Attacks ,researchers have proposed a variety of tracking programs against Denial of Service Attack .Such as IP tracking program, packet marking ,logging ,connection test ,ICMP tracking ,covering networks ,and so on .The marked storage space has been expended by the use of authentication machnism of adaptive probability packet .Increasing marks could store the hash value of the IP addresses of the head node .With the selection of the mentioned two methods above ,the quantity of needed packet while reconstructing the path has been decreased .And ultimately ,the propose of decreasing the rate of false positives and the computational complexity ,as well as improving the convergence and security have been reached.
Analysis on Problems Shown in Safety Evaluation of China
Authors: Zhang Yi Zheng , Geng Xiao Wei
Published: February 2012

Based on the status quo of safety evaluation in China, the paper points out the issues which occur in China's safety evaluation by studying safety evaluation reports and the research results of safety evaluation institutions, and then carries out an analysis of reasons for these issues. This paper proposes that China should strengthen supervision on safety evaluation, improve the employment standards of professional safety evaluators, optimize the market environment of safety evaluation, strengthen education on professional safety evaluators and set up a special training course for professional safety evaluators in an effort to enhance the professional quality and sense of responsibility of professional safety evaluators and to improve the level of safety evaluation in China both internally and externally.
Study and Analysis on Pollution of Coal Washing and Separating Project
Authors: Su Rong Jun
Published: February 2012

. In order to study the environmental impact of coal washing and separating industry, took Beize coal separating plant as an example to analyze its pollution. According to the requirements of Chinese environmental assessment and its project situation, analyzed its features of technological process and possible pollution such as noise, dust, smoke, SO2, waste water and waste solid etc. during construction and operating period. Accident risk analysis was also done. As a result, the intensity of polluting source were confirmed as 0.47 t/a of dust, 2.60t/a of SO2, 2.38t/a of soot and 40.52t/a of coal gangue respectively. Finally, precaution measures for above mentioned pollutions were proponed. This would lay a sound foundation for the following environmental impact assessment.
Modeling and Simulation of Electro-Hydraulic Proportional Position Control System with the Flexible Hose
Authors: Tian Yong , Liu Bo , Gao Hong Wei , Li Wei Qi
Published: February 2012

A method which utilizes the power bond graph to establish the flexible hose model is described in this work. By using this method, the paper establishes mathematical modeling for the location of electro-hydraulic proportional control system with the flexible hose. And then, this article completes dynamic simulation by MATLAB and analyses the results of simulation. The effect of the flexible hose parameters on dynamics characteristics of the hydraulic system is also studied.
Application of Precipitated Silica in Print Coated Paper Coating
Authors: Liu Quan Xiao , Xu Wen Cai
Published: February 2012

In is paper precipitated silica is used in coated paper coating. It shows that the effect of different silica on properties of pigment dispersion is different. The dosage of silica influences the properties of pigment dispersion too. The viscosity of coating is higher than the corresponding pigment dispersion. The higher the viscosity of pigment dispersion is, the higher the corresponding viscosity of coating is. The more the dosage of silica is and the littler the particle size of silica is, the larger water retention value of coating is. When the precipitated silica is used in coated paper coating, the viscosity of coating is increasing. If precipitated silica coat paper, the whiteness of coated paper increases by 1%-2%
Numerical Simulation of 2D Circular Dam-Break Flows with WENO Schemes
Authors: Sun G.C. , Wei Wen Li , Liu Y.L. , Wang Xi , Liu Ming Qin
Published: February 2012

This paper is concerned with a mathematical model for simulating hydrodynamics of 2D circular dam-break flows with the WENO scheme and the Finite Volume Method. The time discretization uses the Runge-Kutta TVD scheme. By using the proposed model, we calculated the flow property of circular dam-break, and obtained the flow velocity field distributions. The calculated results show that the WENO scheme has higher accuracy and better stability, and has the ability to automatically capture shock waves, and may suppress the oscillations of numerical solution. This model can effectively simulate the hydrodynamics of 2D river flow with irregular boundaries.
Numerical Simulation and Experiment Research on Pressure Fluctuation and Aerodynamic Noise Field of a Multi-Blade Centrifugal Fan
Authors: Gao Feng , Zhong Wei Yan
Published: February 2012

Numerical simulation of the three-dimensional steady and unsteady turbulent flow in the whole flow field of a multi-blade centrifugal fan is performed. Unstructured grids is used to discrete the computational domain. Pressure boundary conditions are specified to the inlet and the outlet. The SIMPLE algorithm in conjunction with the RNG k-ε turbulent model is used to solve the three-dimensional Navier-Stokes equations. The moving reference frame is adopted to transfer data between the interfaces of the rotating field and the stationary field. Based on the calculation of the inner-flow in the fan, the pressure pulsation of some important monitoring points and the aerodynamic noise distribution, banding together experiment data were farther analyzed The simulation results are of important significance to the optimal design and noise control of the fan.
Optical 3D Scanning of Small Parts
Authors: Morovič Ladislav , Pokorný Peter
Published: February 2012

The paper deals with the investigation of 3D digitizing of small parts specifically by optical 3D scanner GOM ATOS TripleScan. The paper shortly illustrates the general concept of Reverse Engineering, which includes also the 3D scanning. The paper also describes the optical 3D scanner GOM ATOS TripleScan and a three-dimensional model obtaining procedure by means of this scanner. In the main part of the paper the concrete 3D scanning process of chosen individual objects is described (clips, ball nose end mill, screw drill, coin). Their shape and size were specific and distinct, therefore it was possible to test and compare particular digitizing attributes. The problems that occurred during 3D digitizing of individual parts are step by step discussed and solved.
Numerical Analysis of Super Drill of Shaft Well Boring Machine in the Stress Field
Authors: Zhu Wei Guo , Wang Ya , Zhang Ke Ren
Published: February 2012

We research the super two-stage rapid drill of shaft well boring machine, taking the mathematical model of the drill in the stress field of shaft bottom as theoretical basis. Taking linear elastic and nonlinear features of element material into consideration, we establish element model in the stress field of shaft bottom and material model of stratum rock. Furthermore, we use the finite element method to numerically simulate the fragment intake effect of the super drills with diameter of 400mm and 800mm respectively. The result can be applied in the field of mine exploiting and tunnel advancement.
Research on the Performance Measurement of High School Leadership Training Camps
Authors: Tsai Chang Chun , Lee Cheng Jung
Published: February 2012

This paper thus applies Balanced Scorecard to construct performance measures according to the stated goals and actual results of the training program. Data collected through a questionnaire survey is analyzed using descriptive analysis, one-way ANOVA, and factor analysis to explore factors affecting the performance of the training program, differences caused by environmental and individual factors, and the causes of these differences. Finally, suggestions on the application of the proposed measures to analyze the effectiveness of human resources training are provided. These suggestions can be a basis for the future implementation or improvement of human resource training programs.
Optimization Research on Spares Supply for some Equipment Based on Fuzzy Comprehensive Evaluation
Authors: Li Qing , Yang Wei , Rong Peng Hui
Published: February 2012

Because of large equipment with complicated structure, many kinds of components and tough management, various factors which impacting the equipment exerting its effectiveness level and techniques of handling for their quantification are discussed and the consumed law is studied aiming at fully exerting the equipment’s effectiveness. The fuzzy matrixes are determined and the comprehensive evaluation matrix calculated by the theory and methods of fuzzy comprehensive evaluation. Based on the results from quantitative analysis, the spares’ importance in the process of management and supply is made certain. It provides basis for the spares’ scientific management and supply.
Study on Ion Concentration of New Type Transverse Plate ESP
Authors: Yi Cheng Wu , Ma Shuai , Zhao Yun Qing , Yi Rong Jie
Published: February 2012

According to the transverse plate electrostatic precipitator with high velocity collect dust theory, established the laboratory scale transverse plate ESP combines the hydrodynamic, static electrics. In this paper, experiment of ion concentration are carried using the transverse plate ESP. (The laboratory scale transverse plate electrostatic precipitator self-designed) system. The influence rules of the factors to ion concentration are examined such as distance between the export, the discharge electrode, applied voltage, internal of dust collection plates and the gas velocity. According to the experiment result, the ion concentration can increase about 109/cm3, when the working voltage is 18kV, the gas velocity is 4m/s, the distance of effective dust collecting plate is 40mm. The ion concentration of electrostatics precipitator system reaches the maximum and is above 109.
Optimal Efficiency Shift Schedule of Automatic Transmission for Construction Vehicle
Authors: Kang Huai Liang , Gong Jie , Zhao Ding Xuan , Li Tian Yu
Published: February 2012

The working conditions for construction vehicles (wheel loader, bulldozer, etc.) are very complicated and the operating loads change frequently and sharply. This result will lead to lower powertrain efficiency. In order to maintain the high efficiency of construction vehicles equipped with automatic transmission, an optimal efficiency shift (OES) schedule with 3-parameter (vehicle speed, throttle opening, and hydraulic pump pressure) is proposed and designed by creating and analyzing the powertrain model. A dynamic simulation model using the OES schedule for the construction vehicle has been established by MATLAB/Simulink. The simulation results show that the 3-parameter shift (3PS) schedule is superior to the 2-parameter (vehicle speed and throttle opening) shift (2PS) schedule in energy saving.
The Finite Element Analysis of Plate's Distance on Push-Extend Multi-under-Reamed Pile
Authors: Xie Xin Ying , Yin Xin Sheng
Published: February 2012

In this paper ,it analyses the push-extend multi-under-reamed pile in use of elastic-plastic theory by the software ANSYS.It takes four push-extend multi-under-reamed piles which are the same except plates' distance.It introduces the realative theory to make the anlysis much more accuracy.The results which is taken by ANSYS are researched to find out the regularity and can certain the reasonable plate's distance to anlyze the bearing capacity of push-extend multi-under-reamed pile at the same time.
Agricultural Information Service Evaluation System
Authors: Wei Dong Ling , Liu Shou Yi , Liu Jia Jun
Published: February 2012

[Objective] This paper is to study how to build an agricultural information service evaluation system from the agricultural information service evaluation goals, ideas and methods. [Processes and Methods] Empirical and normative analysis processes methods combining with literature research and actual investigation are applied. [Results] Based on the classification under the unified index structure index system theory, the use of integrated design of quantitative and qualitative analysis and design, level of analysis, synthesis evaluation methods and etc., to build agricultural information service evaluation system. [Conclusion] On the one hand, to build agricultural information evaluation system, is beneficial to run on the status of agricultural information evaluate, to monitor trends in construction, on the other hand, it can help to optimize management decisions and to guide the construction of agricultural information for decision-making basis.
Preparation and Properties of Chrome Tanning Agent from Chrome Sludge
Authors: Liu Na , Ding Zhi Wen , Cheng Bao Zhen , Pang Xiao Yan , Cheng Zheng Ping
Published: February 2012

In this study, Regenerated chrome tanning agent is prepared from chrome sludge by hydrogen peroxide oxidation. The regenerated chrome tanning agent was characterized by IR which reveals that organic acid and protein polypeptide combined with chrome have been mostly removed. A small part of organic acid and protein polypeptide, not oxidized, increases the masking effect of the product. The application results show that the shrinkage temperature (Ts) of wet blue leather can reach 100°C and the leather has good feeling of handle and fullness which shows it has same properties with commercial chrome tanning agent.