bluuebunny/crossref_metadata_2025 huggingface dataset:
Suppression of Ground Vibration for SSRF Foundation
Authors: Wang Xiao , Yan Zhong Bao , Du Han Wen
Published: September 2011

The electron beam stability is one of the most important requirements for the Shanghai Synchrotron Radiation Facility (SSRF), whose ground vibration is much larger than other light source for softer soil and deeper rock. This paper concentrates on the attenuation of the ground vibration, especially induced by the nearby vehicles. The result indicates that the variation of the ground-vibration amplitude is in a good accordance with the vehicle-number distribution, and the SSRF foundation achieves an obvious attenuation effect since it can attenuating more than 80% vibration induced by the vehicles nearby, which is mainly due to the slab and piles of the foundation. In order to achieve the design criterion, the vehicles with weights equal to or heavier than 10 ton should be prohibited to pass through the nearby roads.
The Simplified Analytical Method for Computing Dynamic Characteristics of Transmission Steel Towers
Authors: Yang Jing Bo , Zhao Jin Fei , Jiang Jun
Published: September 2011

Based on vibration theory, simplified analytical methods for computing the first natural vibration frequency and mode of transmission steel tower are investigated, which has improved the currently applied method. The method for frequency includes parameters of lumped mass such as tower head or cross arm, and can show the influence of section of tower main leg. The method for mode considers tower height, root space and head width. Examples of some typical transmission steel towers show that the dynamic characteristics computed with the simplified analytical methods are close to those of the Finite Element Method. Then the methods given in this paper are superior to the present methods used in engineering and have a better generality, which are suitable to different tower type structures.
Mode Jumping in Structural Damage Identification for Beam String Structure
Authors: Jiang You Bao , Liao Guo Yu
Published: September 2011

Modal parameters are widely adopted to identify structural damages. This paper explores the mode jumping problems in damage identification for Beam string structure (BSS). The characteristics of structural mode are discussed firstly. It is found that the modal concentration is obvious for BSS, and this may cause modes after damage not in the same order as those corresponding ones before damage due to proper structural damages. The reasons for mode jumping are analyzed in detail. Based on the principle of relativity, the correspondence of the structural modes before damage and after damage can be determined by calculating the mode correlation coefficients. Numerical experiments show that this method is of higher precision, and can be applied successfully in structural damage identification for BSS.
Simulation Analysis of Dynamic Characteristics on Three-Body Vibrating Screen
Authors: Ding Chuan Guang , Song Fang Zhen , Song Bo , Men Xiu Hua
Published: September 2011

However three-body vibrating screen is widely used in engineering practice, many dynamics of it have not well been addressed. For studying three-body vibrating screen dynamics, the vibrating screen dynamic model and the virtual model were established. Through deriving the dynamic equations and simulating the vibrating screen start - running process, the analytical equations and the trajectories were obtained. Studies have shown that the VBVS vibration in the Z direction is complex and the X direction which perpendicular to the axis of exciters is the sensitive direction for the installation error. In addition, the SBD’s trajectories in the direction which does not exist exciting force are superimposed by the trajectories of USB and LSB.
Vibration Analysis of Functionally Graded and Magneto-Electro-Elastic Materials in Spherical Symmetry
Authors: Qun Guan
Published: September 2011

Considering that the functionally graded and magneto-electro-elastic materials are in the spherical coordinate system and not accounting the body weight, body electric charge and body electric current. By the motion equation, gradient equation the functionally graded and magneto-electro-elastic materials constructive equation, the steady-state solutions of variables such as stress, strain, displacement, electric displacement, electric field intensity, electric potential, magnetic intensity, magnetic potential under additional stimulations are deduced. There can provide good theoretical basement for the dynamic control of the functionally graded and magneto-electro-elastic materials in the space spherical symmetry.
C1 Natural Element Method for Couple-Stress Elasticity
Authors: Han Ru Jun , Nie Zhi Feng
Published: September 2011

The shape functions in C1 natural element method (C1 NEM) are built upon the natural neighbor interpolation (NNI), and realize the interpolation to nodal function and nodal gradient values, so that the essential boundary conditions (EBCs) can be imposed directly in a Galerkin scheme for the partial differential equations (PDEs). In the present paper, C1 NEM for couple-stress (CS) elasticity is constructed, and the typical example which has analytical solutions is presented to illustrate the effectiveness of the constructed method.
Thermal Analysis on the Shell Stiffeners of Double Steel Wall LNG Storage Tank
Authors: Zhang Xiao Chun , Cai Yuan Qi
Published: September 2011

Shell stiffeners are used effectively to prevent preferential local buckling of LNG tank shell. In this paper, Finite element method (FEM) is applied to pay attention to the thermal analysis on the shell stiffeners of double steel wall LNG storage tank. The structural requirements according to British Standard 7777-2:1993 has been considered and then some dimensional adjustments of shell stiffeners are made to evaluate their influence on the thermal field of double steel wall LNG storage tank. Temperature distributions and heat flux of different dimensional shell stiffeners are presented. Though the analysis of results, it puts forward the conclusion that the dimensional design of shell stiffeners used in double steel wall LNG storage tank shall take not only the structural design requirements but also the thermal design ones into consideration in order to finally save cost in both construction and normal operation.
Kinematic and Dynamic Analysis of Large Coal Vibrating Screen
Authors: Yin Zhong Jun , Zhang Lei , Chen Bing
Published: September 2011

The virtual prototype model of the coal screen is established with Pro/E and RecurDyn based on virtual prototype technology. The kinematic characteristics of different points are obtained by simulation. At the same time, the finite element analysis model of a screen box is established with ANSYS. Modal analysis and harmonic analysis have been carried out based on dynamic analysis technology. According to the results of dynamic finite element simulation, some corresponding improvements were made for the structure of screen box, which makes the stress concentration region of screen box decreased and more uniform stress distribution to meet the design requirements.
Dynamic Modeling and Bifurcation Analysis of Hypersonic Aircraft
Authors: Huang Zhu Xin , Fang Ming Xia , Quan Wei Zhuo
Published: September 2011

In this paper, the hypersonic aircraft model is divided into several substructures according to its structure and shape characteristics. Furthermore, the hysteresis nonlinearity of wing-fuselage connection which is caused by relaxation and friction is within consideration. The third-order piston theory and strip theory is employed to obtain the distribution of nonlinear aerodynamic force which is applied upon the wings. By means of free interface modal synthesis of dynamic substructure method, the nonlinear dynamic model of hypersonic aircraft is obtained. Then, through numerical simulation method, this paper researches on the model’s dynamic response and bifurcation characteristics, which is influenced by different hysteresis nonlinear structure parameters. In the end, it is showed that the parameter of hysteresis nonlinearity has a great impact on response and bifurcation characteristics of the system.
Dynamic Response Analysis for the Solar-Powered Aircraft Composite Wing Panel with Viscoelastic Damping Layer
Authors: Liu Tie Jun , Zhang Yong , Li Gang , Wang Feng Hui
Published: September 2011

In design of solar powered aircraft wing panel, vibration properties of wing panel should be considered, especially for the peak value of dynamic response. In this research, a viscoelastic damping layer is built for vibration isolation, wing panel finite element models of stiffened and no-stiffened structures base on fiber-reinforced laminates with damping layer in the middle are built. Natural frequency and displacement response are analyzed with different thickness of damping layer and structures. Result shows natural frequencies decrease as thickness increased, and that of laminates are lower than stiffened structure. The maximum displacement response value decreased when thickness increased and that of laminates is higher than structured with stiffer. The presented work is helpful for type selection and designing of solar powered aircraft wing panel.
Numerical Simulation of Fluctuating Propeller Forces and Comparison with Experimental Data
Authors: Chen Ming Zhou , Zhou Qi Dou
Published: September 2011

Unsteady CFD method based on realizable k-ε model is used for predicting unsteady forces of propeller working in non-uniform wake. First, CFD computations with different mesh scales were conducted at the propeller design condition, the results show that mesh refinement changed the results little. Then unsteady CFD simulation with different time step intervals was conducted for determining suitable time step interval, the results show that it is suitable for propeller rotating 3° per step. Based on the chosen mesh and time step interval, unsteady CFD simulation of propeller P4118 was conducted in 3-cycle and 4-cycle inflow, the unsteady thrust, torque and horizontal force agree well with experimental data, the results show that CFD method has good accuracy in predicting unsteady propeller forces.
Analysis of CFD for the Vortex Rope in the Draft Tube Urged by the Long and Short Blades Runner
Authors: Zhang Si Qing , Li Chang Zhen , Zhang Li Xiang , Zhang Xiao Xu
Published: September 2011

The RNG turbulence model is used to carry out the 3D steady turbulent calculation on the runner and draft tube of the Francis turbine. And the prototype of the Francis turbine is HLA351. Under 8 typical operating conditions, numerical simulation on how the runner outlet urge the vortex rope in draft tube are accomplished in this paper, and the calculation models are long blade model and mixed blade model. The results show that the runner outlet of the mixed model can lead the vortex rope location to the downstream relatively, reduce the circumfluence and cushion area and the probability of the second-vortex. What’s more, the flow pattern in mixed model is superior to the long model and that benefits the operation stability and economy of the unit.
Robust Optimization of Dynamic Response of Structures with Uncertain Parameters
Authors: Chen Shi Wei , Jian Kai Lin
Published: September 2011

On the base of traditional robust optimal design in statics, in this paper, by considering the system under the incentive force of the arbitrary time function, the dynamic response robust optimal design problem, when system dynamic response can only be calculated using numerical integration. Considering the environmental interference factors in a system, derived the expression of response with a small parameter perturbation finite element method. Through the tiny fluctuation frame system in a post and beam’s elastic modulus, realize the robust optimal design of the structural dynamic response, and using New-mark method for dynamic analysis, robust optimal design is applied in dynamic response optimization. Compared to the traditional optimal design’s result in a frame system, robust optimal design of the frame displayed a significant improvement in performance.
The Optimization of Balancing Least Squares Influence Coefficient Method Based on Particle Swarm Optimization
Authors: Wang Xing Xing , Yang Guo An , Fan Ya Jun
Published: September 2011

On the basis of the rotor dynamic balancing theory, the rotor balancing least squares influence coefficient method has been discussed in detail in this paper. In order to solve the problem that the residual vibration in some of the measuring point and the balancing weight are comparatively large in the balance process with least squares influence coefficient method, particle swarm optimization algorithm with cross-factor, which is an improved swarm intelligence algorithm, is introduced into rotor balancing least squares influence coefficient method. Theoretical analysis and numerical examples show that the algorithm has a good convergence, with reducing the balancing weight and residual vibration effectively compared with basic least squares influence coefficient method. The result can achieve better balance effect in the rotor balancing process.
Dynamic Modeling of Viscoelastic Body in Multibody System
Authors: Cao Da Zhi , Zhao Zhi Hua , Ren Ge Xue
Published: September 2011

Dynamic equations of viscoelastic bodies with fractional constitutive are derived base on the principle of virtual work and the theory of continuum mechanics. The three-dimensional fractional derivative viscoelastic constitutive model is implemented into the flexible multibody system (FMBS), using the 3D solid element based on the absolute nodal coordinate formulation (ANCF), which can exactly describe the geometric nonlinearities due to large rotation and large deformation. The BDF time integration scheme in conjunction with the Grünwald approximation of fractional derivative and the Newton-Raphson algorithm are used to solve the equations of motion. Several numerical examples are presented to demonstrate the use of the modeling procedure presented in this investigation and the effects of parameters in the fractional derivative model.
The Developmental Research on Fault Diagnosis System of Mine Fan Based on Grey Theory
Authors: Li Dong Chen
Published: September 2011

The system uses GRAP in Grey Theory to conduct fault diagnosis of fan and chooses LabWEV for software platform, developing a set of system aiming at fault monitoring on line and diagnosis of mine fan in order to guarantee the running state of fan continuously and efficiently . This system has functions of monitoring on line,fault diagnosis,fault warning,data storage, history inquiry and so on.
Modeling Research for Active Control of Coupled Vibration between Multiple CNC Milling Machines and Flexible Foundation
Authors: Ma Fu Dong , Li Yao Gang , Peng Qian Lin
Published: September 2011

In real life many agencies are using the flexible foundation as a base of support, such as ship hull or deck, the chassis of car, and machine tools work on stairs. With the traditional theory, the mathematical model between machine and based simplified as single-degree-of-freedom, assuming foundation is a rigid, and many investigate for a single machine, ignoring the dynamic coupling of base and the coupling characteristics between vibrators. This paper build a dynamics model with flexible basis and multiple machines, it’s multi-degrees-of-freedom model. The foundation is flexibled. On this basis builiding a model about multiple machines, flexible foundation and vibration isolation system. This paper resolve to the problem of the machine work on stair, research the system include vibrator, actuators, and flexible foundation. Using Lagrange equation deduce dynamics equation. Express every factor in eqution,deduced the state and space expression.Take prepare for optimal and system simulation.
Detection of Cracks in Beam Structures Using Modal Analysis
Authors: Das Pallab
Published: September 2011

In the present study, the modal parameters of cracked plain cement concrete beams have been studied theoretically. A crack in a beam element introduces considerable local flexibility, which has been expressed by local flexibility matrix, the dimension of which depends upon the numbers of degree of freedom considered. An approach based on linear fracture mechanics theory has been used to find flexibility matrix for the cracked element. The FEM program has been developed for eigen-value problems to determine the modal parameters of the cracked beams. Changes in natural frequencies and mode shapes between the damaged and intact beam have been observed. Numerical studies are performed by considering simply supported beam with single and multiple cracks at different locations with different crack depths.
Numerical Simulation on the Torsion Behavior of '+'-Shaped Columns under the Actions of Pressure and Torque
Authors: Li Dan , Xu Yu Ye , Qiu Zheng He , Zheng Yong Lin
Published: September 2011

Nonlinear finite element analysis (FEA) for the torsion behavior of reinforced concrete '+'-shaped columns with various axial load ratios was carried out by the general software ANSYS. Then a comparison between the FEA calculations and the test results is made. The numerical examples show that: (1) the cracking torque and ultimate torque of reinforced concrete '+'-shaped columns under the combined actions of axial force and torque can be predicted with a reasonable accuracy. (2) the axial ratio has significant effects on the torsion behavior '+'-shaped columns. The cracking torque and ultimate torque of '+'-shaped columns increase with an increase of axial load ratio. Comparing with reinforced concrete '+'-shaped column with an axial load ratio of 0.063, the cracking torque and ultimate torque of reinforced concrete '+'-shaped columns with axial load ratios of 0.189 and 0.314 were increased by 28.3% and 71.9%, 79.4% and 96.0%, respectively.
Key Factors for the Dynamic-Static Drainage Consolidation Method
Authors: Zhang Li Juan , Li Zhang Ming , Law K. Tim
Published: September 2011

This paper discusses the key factors of the dynamic-static drainage consolidation method as it applies to a petroleum storage site that features very soft mud of strength as low as 8.5 kPa. A field experiment was conducted to study the key factors on the success of this method such as effects of the number of tampings and the number of passes. The excess pore water pressures, settlements, field vane strengths were measured. Analysis of the results of measurements at the site leads to the conclusions that this method gives excellent results for strengthening the very soft mud. In addition, for a given total compaction energy, better result is obtained by increasing the number of passes with corresponding decrease in the number of tamping in each pass and limiting the compaction energy at a point for each pass to less than 1000kN.m.
Mechanic Behavior Analysis of Connection with Haunch under Single and Cyclic Load
Authors: Jiang Li Yun , Liu Guo Jun , Sun Xu Dong
Published: September 2011

Connection with haunch is a new type of rigid connection. Single and cyclic load test is modeled using the program ANSYS. The result under different axial-compression ratio including hysteretic curve, the energy dissipation coefficient, and the plastic angle on beam ending is ascertained. The hysteretic curve under the ratio 0.3-0.6 is stable, and shows better plastic rotation ability. It exists a limit that axial-compression ratio has an effect on the connection with haunch, the model in this paper is 0.6. With hunch, the node can not only make the relocation of the plastic angle occur, but also increase yield stiffness, ultimate load, energy dissipation coefficient, linear displacement ductility coefficient and the plastic angle of beam end.
Dynamic Response of a Ring-Stiffened Cylindrical Shell Subjected to Underwater Explosive Loading
Authors: Yuan Jian Hong , Zhu Xi
Published: September 2011

Choosing scaled stiffened cylindrical shell model as simulation object, the simulation model of stiffened cylindrical shell subjected to underwater explosion load is built by using MSC-DYTRAN finite element analysis software, the typical test conditions which shock factor is 1.1 is simulated, the damage properties of stiffened cylindrical Shell is analyzed, numerical results are compared with experimental data, it is proved that the simulation method is effective and feasible. By performing a series of numerical experiments, the influence of attack angle of explosive and submergence depth of model on the elastic-plastic dynamic response were investigated. It is shown that angle of 90 degrees is the most serious attack angle, angle of 0 degrees is less serious than other angle, the submergence depth of stiffened cylindrical shell has obvious influence on dynamic response, the more deep cylindrical shell is, the more serious cylindrical shell is damaged.
Analysis Method of Secondary Moment in Prestressed Plane Structures
Authors: Kou Su Xia , Guo Nan
Published: September 2011

In prestressed plane structures, tensioning prestressing tendons in one direction will bring primary moment in another direction, so the method of calculating secondary moment by removing the primary moment from the resultant moment is not applicable for plane structures, in which the primary moment is calculated by prestressing force multiplying the distance from prestressing force to neutral axis of section. The reason for this method can not be used for calculating secondary moment in plane structures is analyzed. The method for calculating secondary moment in plane structures is presented.
The Construction Control of Long-Pan Continuous Beam Bridge Based on Self-Adaptive Control Method
Authors: He Ya Bo , Wang Qin
Published: September 2011

The construction control is very important to the construction quality of long-pan continuous beam bridge, so a self-adaptive construction control analysis method is proposed. A construction self-adaptive control system is established in this paper, which is based on the self-adaptive control theory and the characteristic of long-pan continuous beam bridge construction. The sensitivity analysis method is used to choose the most important parameters. The least squares method is utilized to parameter identification. The construction forecast control is also included in the construction self-adaptive control system. The analysis result of a beam bridge shows that the self-adaptive construction control analysis method is feasible and reasonable.
Experimental Study of Temperature Correction on Single-Mode Sleeve Fiber for Distributed Strain Monitoring
Authors: Gao You Long , Xu Guang Li , Zhang Jun Yi , Le Qi Lang
Published: September 2011

Because of the temperature effect of the distributed strain observation, it is not easy to analyze the real strain in tested data. Experiments of fibers under different temperatures and force conditions are carried out. The bare fiber, Φ 0.9 SM and Φ 2.0 SM single-mode sleeve fibers are chosen in the experiment scheme. It was found that the temperature effect of the distributed strain is independent with the force condition. The additional strain of fibers under the stress and different temperatures are discussed. For practices using, temperature correction equations on single-mode sleeve fiber are proposed to reduce the temperature effect.
Noise Variance Estimation Based on Knowledge of Noise Reduction Coefficient
Authors: Jakub Peksinski , Grzegorz Mikolajczak
Published: September 2011

The paper presents interference estimation method involving search for “flat” area, on the basis of image analysis taking into account correlation coefficient and knowledge of variance reduction coefficient for noise in the filtered area. The proposed method was tested for an interference characterised by normal distribution, and then compared to the other ones.
Design of a Dynamic Magnetic Field Steered Cathodic Arc Source in Arc Ion Plating
Authors: Lang Wen Chang
Published: September 2011

In this work, a dynamic arched magnetic field steered arc source was deigned by virtue of Finite Element Method (FEM) calculation. The magnetic field was produced by two main electromagnetic coils so that the magnetic field can be adjusted with the help of the two currentI1and I2,whereI1is the current to the internal coil mounted coaxially in a magnetic yoke generating a static arched magnetic field to confine the cathode spots and I2is the current to the external coil mounted coaxially outside the above yoke adjusting the position of the vertex of arch. Base on the results of simulation, it was found this design enable the sweeping of the arc spots on the target surface by means of adjusting the ratio of current (I1/I2) , and cause the arc distribute evenly on the cathode surface in the diffuse arc mode transferred from the constricted arc mode. The effects of the target thickness and current ratio on the configuration and intensity of dynamic arched magnetic field were investigated. The optimized operating modes was proposed and discussed.
Application of Frequency Converter Driver in Long Belt Conveyor
Authors: Lou Guo Huan , Yin Hai Li , Li Shu Jie
Published: September 2011

With the frequency converter for driving belt conveyor, the synchronous control of torque and speed for the belt-drive unit can be achieved and the start-up characteristics of belt conveyor can also be improved. This paper uses two methods for achieving synchronous drive of belt conveyor, one is synchronization through master-slave control of frequency converter itself, the second is adding external algorithm implemented by PLC systems. This article describes a variable-frequency adjustable-speed drive system used for long distance belt conveyor in mine main inclined shaft or ground. This frequency conversion device and system can be applied to the adjustable-speed drive process of constant torque load for conveyor.
Design of Medical Monitoring and Locating System Based on GPS and GPRS
Authors: Ti Yuan , Liu Shu Dong , Wang Xiao Yu
Published: September 2011

According to the difficulty of monitoring special patients in hospitals as well as their inclination to getting lost when going out alone, the design of a personal medical monitoring and positioning system is presented based on GPS and GPRS. The system receives navigation and position information continuously from a GPS satellite through GR-87 receiver module, and real-time sends the information of vital signs and position to the monitoring center in the hospital or a GPRS cell phone terminal with SIM300 module through GPRS network, so as to perform long-distance medical monitoring and location tracking to a patient, with such advantages as high positioning precision, good real-time performance, low power consumption, etc.
Antioxidant Properties of Laoying Tea (Litsea Coreana L.) Extracts
Authors: Ji Hong Fang , Zhang Ling Wen , Zhang Yuan , Jin Hui Hui , Wang Ling Yu
Published: September 2011

The petroleum ether, acetic ester, methanol and water extracts of laoying tea were prepared and their antioxidant properties were studied. At 160 µg/mL, the methanol extract showed a high reducing power of 1.206. With regard to the scavenging ability on 1,1-diphenyl-2-picrylhydrazyl radicals, extracts were effective in the order: methanol > acetic ester > water > petroleum ether extracts. EC50 values for chelating ability on ferrous ions for petroleum ether, acetic ester, methanol and water extracts were 11.76, 14.32, 6.05 and 1.02 mg/mL, respectively. Based on EC50 values, the various extracts from laoying tea were effective antioxidants.
Study on Combination and Bioremediation of Chlorimuron-Ethyl-Degrading Strains
Authors: Xu Chun Hong , Li Chun Yan , Xiong Ming Hua , Pan Jun Bo , Li Xue Song , Cheng Xiao Song
Published: September 2011

The degradation capacity of the four chlorimuron-ethyl-degrading strains, D310-1, LCY-2, LCY-3 and LCY-4, which identified asRhodococcussp.,Stenotrophomonas maltophilia sp,Bacillus subtilis sp., andRhodotorula mucilaginosasp., respectively, combined in different ways was examined in this study. Then the optimal degradation conditions and mitigation phytotoxicity of chlorimuron-ethyl on sensitive crop were investigated by both orthogonal test and pot culture experiment. The experimental results showed that the combination of four strains was adopted, and the removal rate of chlorimuron-ethyl reached the maximum of 90% in 30 days. Then the optimal degradation conditions were inoculum size 2.5%, temperature 28°C, pH 7.0 and the soil moisture 35%, and the mixed strains could eradicate 92.57% of chlorimuron-ethyl within 30 days. Furthermore pot culture experiment indicated that inoculation of mixed strains could also mitigate the phytotoxic effects of chlorimuron-ethyl on the growth of cucumber seedling.
6-Gingerol Function against Fatigue
Authors: Huang Xue Song , Peng Ning
Published: September 2011

6-Gingerol was extracted and isolated from fresh ginger (Zingiber officinale Roscoe) to determine its effect on anti-fatigue. The loading forced swimming time, glycogen content in liver and muscle, lactic acid in blood and the content of urea nitrogen in serum were determined from the mice treated orally with 0.30 mg/kg of6-gingerol for 6 weeks. The results show that the mice swimming time treated orally with 6-gingerol was prolonged two-fold longer than that treated with distill water and the glycogen content in liver and muscle and the recovery rate of lactic acid in bloodare increased (P<0.05). And 6-gingerol also significantly decreased the urea nitrogen in serum after swimming (P<0.05). It concludes that 6-gingerol exhibits fatigue resistance. The anti-fatigue mechanism of 6-gingerol is the results from increasing the glycogen storage in muscle and liver, which enhance the aerobic metabolic ability in strenuous muscle activities, accelerate the elimination of fatigue and enhance the adaptation to load exercise.
Study of Supervised Segmentation Algorithm Based on Ant Colony for Putamen Region in Brain MRI
Authors: Liu Xiao Jun , Dong En Qing , Lv Cheng Lin , Li Xiao Yang , Cui Bo , Zheng Qiang
Published: September 2011

A supervised segmentation algorithm based on ant colony for putamen region in brain MRI is proposed. Since the variance of the putamen template and the searching contour is adopted as the object function, the solution process for the supervised ant colony algorithm model proposed is transformed as the process of the minimum of the object function, or as the optimal searching path problem in the search space. A new scheme for finding search space is proposed, and discusses how to decide the optimal searching scheme. By a general hypothesis for the template, the solution process for the problem is described in detail. A great deal of experimental results show that the supervised segmentation algorithm based on ant colony proposed is better than the Fuzzy c-Mean segmentation, region growth segmentation, GVF(Gradient Vector Flow) Snake model segmentation and the basic ant colony segmentation in the shape of the real template, the shape comparability between adjoining slices and the continuity in single slice. Moreover, the convergence speed of the proposed algorithm is the fastest than the others.
Nitric Oxide-Donating Derivatives of Chrysin Stimulate Angiogenesis and Upregulating VEGF Production
Authors: Zou Xiao Qing , Ding Yong Lan , Peng Sheng Ming , Hu Chang Ping , Deng Han Wu , Li Yuan Jian
Published: September 2011

Angiogenesis, the development of new capillaries from pre-existing vessels, requires the coordinate activation of endothelial cells, which migrate and proliferate to form functional vessels. Endothelial dysfunction and decreased nitric oxide bioavailability may underscore the impairment of angiogenesis. As such, the delivery of exogenous NO is an attractive therapeutic option that has been used to therapeutic angiogenesis. In this paper, a novel group of hybrid nitric oxide-releasing chrysin derivatives was synthesized. The results indicated that all these chrysin derivatives exhibited promotion of endothelial migration and tubulogenesis in vitro as well as stimulation angiogenesis in vivo.Furthermore, all compounds released NO upon incubation with phosphate buffer at pH 7.4 and enhanced VEGF secretion and VEGF mRNA expression of endothelial cells. These hybrid ester NO donor prodrugs offer a potential drug design concept for the development of therapeutic or preventive agents for angiogenesis deficiency due to ischemic diseases.
The Method of Logging Curves Fusion Based on Multi-Scale Wavelet Transform
Authors: Yu Yun Liang , Bai Ye , Wang Jian Qiang , Li Wen Qing
Published: September 2011

The mutation and form of logging curve can be represented by the variation of modulus maxima coefficients of wavelet transform within different scales exactly, then we can use wavelet multiscale edge detection theory to analyze characteristics of sequence stratigraphy boundaries in logging curves. Obtain the modulus maximum of approximation coefficient matrix and detail coefficient matrix after decompositing GR and SP curve in every scales.Compare and amend the modulus maximum of approximation coefficient matrix and detail coefficient matrix reciprocally, applicate the Mallat alternation foldover algorithm to reconstruction logging curve eventually ,we can get the fusion curves in different scales. The fusion curves can greatly enhance characteristics of sequence stratigraphy boundaries in logging curves.
Predictive S Control of AUV Based on Model of Support Vector Machine
Authors: Zhang Guo Cheng , Zhang Lei , Wan Lei , Li Ji Qing
Published: September 2011

Because of nonlinear dynamic performances and uncertain working environment, precise motion control of Automatic Underwater Vehicle (AUV) has always been a problem. For the time lag and nonlinearity of AUV, a new method called Predictive S Control (PSC) based on model of Support Vector Machine (SVM) is presented. Firstly, in establishing the model of SVM, the fine property of approaching to the nonlinear model is utilized to solve the predictive problem. Then, the control parameters of S controller are optimized by constructing the error function. At last the motion control of AUV is realized. It has been proved that this method is feasible and effective. Using this method, a good control result is obtained in the simulation.
Design and Realization of Portable ECG Monitor with Dual CPU
Authors: Yang Fang , Hang He Ping , Shen Jin Hui , Shao Ming Gang
Published: September 2011

In order to meet data acquisition mobility and convenient requirements of the portable ECG monitor, the data acquisition system of ECG with dual CPU is designed in this paper. The system, in which C8051F005 is master CPU, meanwhile ATmega168 is slave CPU, consists of analogical circuit for detecting of ECG, amplifier-filter circuit, A/D converter and SD memory card communication interface mainly. Experimental data shows that the system has such advantages such as good repeatability, high accuracy, quick response and excellent anti-interference. It can effectively detect and obtain electrical activity of the heart and cope with continuous large memory with SD memory card in embedded system. Strong background noises are eliminated effectively by multi-level amplifier and filter; Un-anamorphic ECG can be acquired and recorded synchronously in memory cards. Moreover, this paper also proposes a preprocessing algorithm for noise reduction so that it can reject the interference by respiration and surface EMG signal.
Co-Treatment of Rural Kitchen Waste and Domestic Sewage to Produce Biogas Research
Authors: Li Ding Long , Hu Yuan , Zhang Yi Min , Zhang Hou Hu
Published: September 2011

In order to deal with rural kitchen waste and domestic sewage properly, they were held in a reactor for co-treatment to produce biogas. The inflow was set as 50ml, 100ml and 150ml. The cycle was set as 3-day and 5-day. The effect of different inflow and cycle on the co-treatment was investigated during 45-day experimental period. The result showed that accumulative methane production had a positive correlation with inflow and cycle. Accumulative methane production of 150ml-inflow was better than that of 50ml-inflow. It multiplied 4.2 times during 3-day cycle and 1.2 times during 5-day cycle. Accumulative methane production of 5-day cycle was better than that of 3-day cycle at the same condition of inflow. It multiplied 4.8, 3.7 and 1.5 times, respectively. The quality of effluent was monitored as follows: CODCr > 10,000mg·L-1, TN ≈ 600mg·L-1, TP ≈ 100 mg·L-1. It could be serviced as the liquid fertilizer used in the agriculture fields. Rural kitchen waste and domestic sewage were disposed as fertilizer and used in situ.
Remediation of Eutrophic Water Body by Zoobenthos
Authors: Chen Qian , Li Ding Long , Kong Xiang Ji , Zhang Yi Min , Chao Jian Ying
Published: September 2011

To study the temperature factor affecting nutrient release of Cipangopludina Chinensis, laboratory simulation experiments were carried out, and other traits of Cipangopludina Chinensis, such as the effects of nitrogen cycling, phosphorus cycling, suspended substance in water column. Results showed that temperature had great influence on nutrient release of Cipangopaludina Chinensis. The release rate of total nitrogen and dissolved nitrogen increased, but not clear. The release rate of total phosphorus and dissolved Phosphorus increased greatly. When the temperature rose from 8 °Cto15 °C and 35 °C, the release rate of total nitrogen was increased by 5.71% and 23.43%;The release rate of dissolved nitrogen was increased by 6.76% and 17.57%. While the release rate of total phosphorus was increased by 92.60% and 208.35%,the release rate of dissolved phosphorus was increased by 2.25% and 110.17%. At the same situation, the release rate of ammonia nitrogen was increased by 1.89% and 26.55%, The release rate of phosphate was increased by14.27% and 225.96%, but temperature had little influence on nitrate nitrogen. In addition, temperature had little influence on suspended substance(P>0.05). In a word, zoobenthos play a significant role on eutrophic purification, which provide reference for lake eutrophication control.
The Temperature Monitory System of Electric Cable Interface
Authors: Zhou Yan , Yang Ai Mei , Bai Li Yuan , Liu Yu Xun
Published: September 2011

This article introduces a system of online real-time temperature inspecting, diagnose and alarm of the electric cable interface, which is powerful and advanced. The hardware circuit of this system is composed of collector, host control machine and PC. Through the real-time temperature inspecting of the electric cable interface, a series of the display value, figures and tables online can be got. Through the analysis of the temperature curve, we can predict the aging and the overheating of the electric cable interface and the possibility of all kinds of accident, and it helps for eliminating the hazards of the electric cable interface and provides the effective guarantee for the safety operation of the electric cable interface.
The Decomposed Theorem of Torsional Circular Shaft with Two-Dimensional Dodecagonal Quasicrystal
Authors: Zhao Bao Sheng , Zhao Ying Tao , Gao Yang
Published: September 2011

Gregory’s decomposed theorem of isotropic plate is extended to investigate torsional circular shaft for two-dimensional dodecagonal quasicrystal (2D dodecagonal QCs)with homogeneous boundary conditions, and the theory of equivalence that Cheng’s refined theory and Gregory’s decomposed theorem is extended to the cylindrical coordinate. The decomposed theorem of torsional circular shaft of 2D dodecagonal QCs with homogeneous boundary conditions is proposed on the basis of the classical elasticity theory and stress-displacement relations of 2D dodecagonal QCs without ad hoc assumptions. At first expressions are obtained for all the displacements and stress components in term of some 1D functions. Using Lur’e method, the exact equations were given. And the exact equations for the torsional circular shaft on 2D dodecagonal QCs without surface loadings consist of four governing differential equations: two harmonic equations and two transcendental equations.
Optimization of Processing Conditions on the Yield of Nano SiC Powder from Rice Husk
Authors: Kavitha N. , Balasubramanian M. , Vashistha Y.Deval
Published: September 2011

Nanoparticles of silicon carbide were produced through direct pyrolysis of stoichiometerically balanced rice husk. Rice husk used in this study was treated with different type and amount of silica source in order to enhance the silica/carbon ratio and thereby increase the yield. The synthesis was carried out in argon atmosphere. To increase the yield, different process parameters were identified and experiments were conducted at various levels using Taguchi design. The process parameters optimized using this design include silica source, pyrolysis temperature, silica content and heating rate. Silicon carbide produced from rice husk was analyzed using X - ray diffraction to identify the phase. From taguchi factor effect diagram it has been found that pyrolysis temperature and silica source plays major role in improving the yield.
Size Distribution Analysis of Kaolin Using Laser Diffraction Technique
Authors: Ling Felix N.L. , Kassim Khairul Anuar , Karim Ahmad Tarmizi Abdul
Published: September 2011

Kaolin is widely used in ceramic, paper, and pharmaceutical industries. The suitability use of kaolin in industries will depend on its physical and chemical properties. The physical and chemical composition of Kaolin is dependent on its geological origin, geographic source and processing. Processed kaolin available in the market is normally graded by the manufacturer based on its physical and chemical composition. This paper is focused on the size distribution analysis of nine types/batches of processed kaolin and one raw kaolin soil by using laser diffraction technique (based on Fraunhofer diffraction theory) in accordance to BS ISO 13320:2009. The laser diffraction technique is widely used in the powder industries in determining the particle size distribution because of its simplicity and its repeatability. All the specimens were pre-sieved with a sieve of 2mm aperture size. The effective size, uniformity coefficient and coefficient of curvature of the material were also calculated to facilitate the size distribution analysis. The findings of this paper are expected to benefit industries in which size the distribution of the kaolin will directly or indirectly contribute to its suitability use.
Research on Ion Nitriding Temperature Effect on Wear Resistance of 35CrMo Steel
Authors: Pang Guo Xing , Chen Zhi Yong , Li Zhong Lei , Wang Yan Jie
Published: September 2011

The main purpose of this paper is to research on the different ion nitriding temperatures of 35CrMo effect on the surface hardness, wear resistance of the workpiece. With series of experiment and test of micro-hardness, ring-block wear, metallographic observation, to select the optimization temperature for the ion nitriding process of 35CrMo steel.
Investigation of Grinding Surface Temperature: Experimental Measurements and Numerical Modeling
Authors: Babaei Naser , Babaei Alireza , Tanabi Hamed
Published: September 2011

Main restriction for achievable material removing rate and simultaneously high quality parts in grinding process is the high specific energy requirements and consequently thermal damage to workpiece. In this work, a sequence of experimental tests were performed focused on grinding parameters including wheel speed, workpiece feed rate and depth of cut. Previously developed grindiable thermocouples were utilized to measure grinding surface temperature in each experiment. Feasibility of the grindable thermocouples in workpiece surface temperature measurement in the grinding process was investigated. Then, a 2-D finite element thermal model was created using ANSYS code based on the experimental data for numerical investigation. The model was used to predict grinding surface temperature in conditions of the experiments. A comparison between experimental and numerically predicted results for grinding surface temperature shows good agreements within an acceptable margin of error. The absolute average of errors is equal to 6.6%. Therefore, the proposed grindable thermocouple technique can be used in measurement of workpiece surface temperature and study of thermal aspects of grinding process.
Optimization and Implementation of the Surface Rendering Algorithm
Authors: Liang Chen , Jiang Nan , Yu Ya Wen
Published: September 2011

Three-dimensional visualization of medical imaging technology uses two-dimensional medical image sequences to reconstruct three-dimensional model, providing the physician with intuitive, comprehensive, accurate information about the focus and normal tissues, is currently a hot research field of medicine. This essay makes a comparison between the two currently popular algorithms – surface rendering algorithm and volume rendering algorithm, with its focus on the introduction of MC algorithm, meanwhile achieves the integration of three types of improved MC algorithm, completes a high-precision, high-efficiency surface rendering process based on .MFC and OpenGL technologies.
Effect of Gas Metal Arc Welding Parameters on Mechanical Properties for Carbon Steel ASTM A285 Grade A
Authors: Chaisri Mongkol , Peasura Prachya
Published: September 2011

The research was study the effect of gas metal arc welding process parameters on mechanical property. The specimen was carbon steel ASTM A285 grade A which thickness of 6 mm. The experiments with full factorial design. The factors used in this study are shielding gas and voltage. The welded specimens were tested by tensile strength testing and hardness testing according to ASME boiler and pressure vessel code section IX 2007. The result showed that both of shielding gas and voltage had interaction on tensile strength and hardness at 95% confidential (P value < 0.05). Factors affecting the tensile strength are the most carbon dioxide and 27 voltage were tensile strength 213.43 MPa. And hardness maximum of 170.60 HV can be used carbon dioxide and 24 voltage. This research can be used as data in the following appropriate parameters to gas metal arc welding process.
Microstructure and Mechanical Properties of SICP/MoSi2 Composites Manufactured by In Situ Reaction and Hot Pressing
Authors: Wang Han Ying , Ma Gao Shan , Yang Yan Qing
Published: September 2011

Pure MoSi2 and MoSi2 composites with different volume fraction of SiC particles were prepared by the technology of in situ reaction and hot pressing the pure powder of Mo, Si and C after alcohol mixing. The effects of in situ formed SiC particles on the microstructure, the flexural strength and fracture toughness of SiCP/MoSi2 composites were studied. The research shows the relative density, flexural strength and fracture toughness of the composites are increased compared with those of the pure MoSi2 material. It is found that the in–situ formed SiC particles refine the MoSi2 grains and eliminate the brittle SiO2 glass phase. The strengthening mechanism of the composites is of the refinement of MoSi2 grains,dispersion strengthening of the in–situ formed SiC particles and elimination of the brittle SiO2 glass phase.
Synthesis and Characterization of Bioactive Sol – Gel Glass: A Preliminary Study
Authors: Ungureanu Dan Nicolae , Angelescu Nicolae , Catangiu Adrian , Stoian Elena Valentina , Rizescu Cristiana Zizi , Avram Daniela
Published: September 2011

Bioactive glasses based on SiO2-CaO-P2O5 system have been synthesized by sol – gel process. The powder glass obtained has been characterized by X-ray diffraction, X-ray fluorescence spectroscopy (XRF), and Fourier transform-infrared spectroscopy (FTIR). In vitro study reveals formation of apatite layer at surface of powder glass, after 3 days of soaking in simulated body fluid.