bluuebunny/crossref_metadata_2025 huggingface dataset:
La cantate du prix de Rome, côté livret... (1803-1871)
Authors: Deramond Julie
Published: September 2011

Le prix de Rome constitue au XIX e siècle comme au début du XX e siècle une étape nécessaire dans le parcours des aspirants compositeurs. Ils sont ainsi amenés à plancher quelques jours durant sur un livret qu’ils devront mettre en musique. L’écriture de ces textes correspond souvent à une « commande », puis à un concours littéraire soigneusement organisé à l’Académie des beaux-arts. Quant à leur « fabrication », elle répond à une codification stricte qui évolue au cours du siècle, destinée à démultiplier les occasions d’expression pour le compositeur. Si la qualité littéraire et les thématiques abordées constituent un critère de sélection non négligeable, l’adaptation au contexte politique du moment semble également incontournable.
Limb Alignment After Open-wedge High Tibial Osteotomy and Its Effect on the Clinical Outcome
Authors: El-Azab Hosam M. , Morgenstern Mario , Ahrens Philip , Schuster Tibor , Imhoff Andreas B. , Lorenz Stephan G.F.
Published: September 2011

The purpose of this study was to evaluate the accuracy of alignment after open-wedge high tibial osteotomy and its effect on the clinical outcome. A prospective case series of 56 consecutive patients underwent open-wedge high tibial osteotomy fixed with a TomoFix plate fixator (Synthes, West Chester, Pennsylvania). The correction angle was radiologically determined preoperatively and at 6 months postoperatively. The patients were clinically and radiologically examined preoperatively and at 3, 6, and 36 months postoperatively. The mechanical axis of 50 knees was corrected from an average of 5.7° varus to 1.3° valgus. Forty-three patients had an acceptable correction with Mikulicz line crossing the tibial plateau between 50% to 70% of the tibial plateau width measured from the medial border. Undercorrection (<50%, group II) and over-correction (>70%, group III) were found in 4 and 3 patients, respectively. The mean Lysholm-Gillquist score at 36 months had improved in all groups, with a statistically lower value for group II.

Open-wedge high tibial osteotomy results in significant improvement of symptoms and function in all patients in the short term, even with under- and overcorrection of the osteotomy. Undercorrection was associated with a significantly lower clinical outcome in comparison to the accurate correction and overcorrection. Ligamentous laxity or soft tissue slackness of the knee can influence the overall correction after high tibial osteotomy and must be considered in preoperative planning. Patients with a high body mass index had inferior clinical results after open-wedge high tibial osteotomy.
Novel Venting Technique for Intramedullary Rod Fixation of Pathologic Fractures
Authors: Wilkens Kenneth J. , Nicolaou Daemeon A.M. , Lee Mark A.
Published: September 2011

This article introduces a novel technique to vent the femur and potentially decrease the embolic load created by reaming during intramedullary rod fixation of impending pathologic femur fractures. We used readily available operating room equipment to create a distal femoral vent hole without interfering with standard intramedullary instrumentation and with minimal increase in surgical time. This technique can be used for the prophylactic intramedullary stabilization of impending pathologic femur fractures from metabolic bone disease, metastatic cancer, and bisphosphonate use.
Periosteal Avulsion of the Posterolateral Corner of the Knee in an Adolescent: An Unreported Case
Authors: Kovack Thomas J. , Jacob Paul B. , Tesner Raymond , Papp Gerard
Published: September 2011

Isolated injuries of the posterolateral corner of the knee are uncommon injuries in adults and are relatively unheard of in the pediatric population. This article reports a case of a 13-year-old boy who sustained an external rotation injury to his proximal tibia on a slightly flexed knee while playing football. Radiographs showed an avulsed fragment from the lateral femoral condyle. A magnetic resonance image was read as an avulsion of the femoral insertion of the lateral collateral ligament with associated bone bruise of the lateral femoral condyle. At operation, the fragment consisted of the femoral insertion of the popliteus tendon and the lateral collateral ligament, which was anatomically reduced and internally fixed with a screw and soft tissue washer. Six weeks postoperatively, the patient had full range of motion. To our knowledge, this injury has not been reported in the pediatric population.
Functioning Paraganglioma of the Cervical Spine
Authors: Chen Guangdong , Luo Zongping , Liu Tao , Yang Huilin
Published: September 2011

Extradural paraganglioma of the cervical spine is rarely seen. Few reports of this functioning disorder appear in the literature. A 29-year-old woman presented with a 1-year history of left shoulder pain and occasional transitional dizziness. This is the first case of a functioning cervical spinal paraganglioma with symptoms of catecholamine excess throughout the operation. A mass in the neck region was discovered by the patient 2 months prior to hospital admission. Physical examination revealed an egg-shaped soft and unflexible mass with no clear boundary in the anterior left part of the neck. Neither sensory disturbance nor motor weakness was evident in the upper and lower extremities. Laboratory studies were normal. Both computed tomography and magnetic resonance imaging implied neurilemmoma. Embolization of the branches supplying the mass was taken to reduce perioperative bleeding complications 1 day preoperatively. The patient demonstrated frequent hypertensive spikes with tumor handling. The blood pressure changed between 80/40 mm Hg and 200/105 mm Hg throughout the surgery. The tumor was dissected successfully from the paraspinal tissues, followed by spinal cord decompression of C4 to C6, C5 corpectomy, anterior column reconstruction, and anterior internal fixation with a plate. The histopathological examination yielded a postoperative diagnosis of paraganglioma. Diagnosis and treatment of this rare case require comprehensive perioperative management and meticulous surgical excision.
Reliability Analysis of Wood-Plastic Structural Plates
Authors: Yu Gui Wen
Published: September 2011

The wood-plastic structural plates, which were made of polyethylene (PE) and poplar powder, were used in decking as a structural material. It is of great significance to analyze the material reliability for the safety in service. In this paper, the modulus of elasticity and static bending strength of specimens were obtained through test, the first order second moment method (FOSM) was used to analyze the reliability of the wood-plastic structural plates. The result showed that the wood-plastic structural plates have a better reliability, and the reliability of the wood-plastic structural plates was related to the thickness of the specimens.
Study on Shock Response of 2-DOF Nonlinear Cushion Packaging System with Strong Hysteresis
Authors: Yu Zai He , Zhou Jian Wei
Published: September 2011

This paper first establishes the model for a 2-DOF non-linear cushion packaging system with strong hysteresis and then derives its vibration equations. The vibration equations are transformed into ones using dimensionless variables and parameters. The influence of mass ratio and stiffness ratio on the system under excitation of trapezoidal pulse shock has been analyzed based on the response spectra obtained by applying the fourth order Runge-Kuntta method to the transformed equations. Results show that the mass ratio is the key design parameter.
Construction of Dynamical Model of Human Upper Limbs Joint
Authors: Luo Yan Jun , Bei Zhao Yu
Published: September 2011

In this paper, the structure similar to the connection of two connecting rods of human elbow joints is proposed to construct coordinates of connecting rods and the transformation matrix of pose. Lagrange’s equation is used to build dynamic equations including the feature of dynamic equations of musculotendon. Simulation results show that the proposed model is effective and reasonable.
A New Standing-Wave Linear Moving Ultrasonic Motor Based on Two Bending Modes
Authors: Qian Xiao Hua , Shen Meng Hong
Published: September 2011

Linear ultrasonic motors have been of significant research interests for its excellent characteristics, but it’s hindered by complicated structure. The purpose of this paper is to design and manufacture a prototype by utilizing ANSYS software based on the analysis of mechanism. The vibrator of linear motor is composed of a three teeth rectangular medal block, two group of PZT elements which is adhered on the surface of metal block and slider. It is found that the result of FEA analysis is consistent with experiment result.
A Cutting Concentration Calculation Model of a Vertical Wellbore Annulus in Deep-Water Drilling Operation and its Application
Authors: Xia Huan Yu , Zhai Ying Hu , Zhang Xu
Published: September 2011

Cutting transport is a big problem in a wellbore in deep-water drilling specially with a long and large diameter riser. And proper cutting concentration is the key parameter of controlling wellbore pressure and ECD. In this study, a cutting concentration model of a vertical wellbore annulus in deep-water drilling operation has been developed. The model is solved numerically to predict the proportion respectively in each interval of the deep-water well and the rule of proportion changed with time. It is applied in the calculation of cutting concentration in the oil field and a good effect has been achieved.
Simulation Analysis of Gegou Wire Nets Concrete U-Shaped Beam-Supported Aqueduct
Authors: Li Hong Mei
Published: September 2011

Aqueduct is a common water conveyance buildings, this paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Gegou wire nets concrete U-shaped beam-supported aqueduct. Researching variation law of the aqueduct’s stress and displacement in construction process and operational process, the research results offer some reference for design and construction of wire nets concrete U-shaped beam-supported aqueduct.
Flow Field Simulation of the Solo-Supported High Pressure Gas Device of Double-Layer Air Jet Looms
Authors: Liu Yi Sheng , Hu Xu Dong , Su Peng Dong
Published: September 2011

A research program is currently underway with the purpose of developing a double-layer air jet looms with solo-supported gas device. Issues related to the design and feasibility analysis of the solo-supported high pressure gas device are discussed. The results of simulations show that assistant nozzle is necessary during weft insertion motion, but too many assistant nozzles would cause the flow velocity reduce. And it is confirmed that flow channel with one main and four assistant nozzles is one of the best designs to keep the flow velocity at the middle line of flow channel more than 90m/s and make the loom work swimmingly.
Meshless Method for the Numerical Solution of a Kind of Linear Hyperbolic Equations
Authors: Sun Hai Na , Cheng Rong Jun , Ge Hong Xia
Published: September 2011

The present paper deals with the numerical solution of two-dimensional linear hyperbolic equation using the meshless reproducing kernel particle method (RKPM). A variational method is used to obtain the discrete equations and the essential boundary conditions that are enforced by the penalty method. The effectiveness RKPM for two-dimensional hyperbolic problems is investigated by two numerical examples in this paper.
Numerical Study of the Behavior of Reinforced Concrete Shear Walls during Fire Exposure
Authors: Liu Gui Rong , Qu Fu Lai , Song Yu Pu , Li Chang Yong
Published: September 2011

A simple method based on the well-known sectional analysis approach is presented to trace the structural behavior of reinforced concrete (RC) shear walls exposed to fire. It is similar to the approaches described in the existing literature but it does not require computations of moment-curvature curve group. This method can take into account material nonlinearity by use of the coupling constitutive relation of materials. Moreover, the geometric nonlinearity is considered by taking account the second-order effect of axial forces. The predictions of the proposed method are validated using experimental and analytical studies.
Machining Process Level Cost Estimation in Cutting-Tool IPSS
Authors: Mu Hui , Jiang Ping Yu , Zhu Qi Qi
Published: September 2011

Industrial product service systems (IPSSs) are special product-service packages used to improve productivity and reduce cost in the life cycle of industrial products, where cost estimation plays a very important role in price making and cost optimization. This paper defines an IPSS for cutting tools and discusses its working modes briefly. A machining process level cost estimation scheme is then proposed for the cutting-tool IPSS. An example has been developed to illustrate the proposed approach.
A Software Framework for Optimization of Process Parameters in Material Production
Authors: Grešovnik Igor , Kodelja Tadej , Vertnik Robert , Šarler Božidar
Published: September 2011

A framework for optimization of process parameters in material processing and production is described. The framework is designed for effective set up and solution of optimization problems as part of process design, as well as to support development of numerical models by inverse identification of model parameters. The general framework is outlined, which has been supplemented by a neural networks module in order to enable real time decision support. Simulator based on meshless method with radial basis functions (RBF) has been utilized.
Experimental Research of the Elastic Abrasive Tool Used for Finishing Mould Surface
Authors: Wang Gui Lian , Wang Yi Qiang , Zhou Hai Bo , Yan Bing Bing
Published: September 2011

A compliant abrasive tool is investigated in this paper. By the polishing experiment of this abrasive tool, the technique of polishing the large mould free-form surface is acquired. The polishing experiments about the elastic abrasive tool are carried out, which indicates that the abrasive tool has the advantages of the high efficiency, the elasticity and compliant performance. The relation of the deflection and polishing force is investigated and it is concluded that they is approximately linearity. The effect of polishing pressure on the surface roughness is researched by experiment. Polishing quality for the edge of abrasive tool was investigated and presented. These experiment results provide significant foundation for planning polishing path and controlling process parameters to achieve good surface roughness and high efficiency in the next research.
Slant Detection and Correction of Mobile Phone Keyboard Image
Authors: Peng Chun Jiang , Zhao Qian Cheng , Huang Geng
Published: September 2011

In vision detection system of mobile phone keyboard, images coming from product line are often slant. Those images have to be corrected in order to facilitate match and recognition in further image processing. This paper proposes an effective slant correction method based on the characteristics of mobile phone keyboard image. In this method, straight line edge detection is done only by horizontal Sobel operator. The angle parameter of straight line is tested by multiresolution Hough transform. Then the angle relation is deduced between the tested line and slant mobile phone keyboard image. The slant image is corrected by rotation algorithm which combines the fast rotation algorithm with bilinear interpolation algorithm. The results of experiment indicates that the method and its algorithm are effective and accurate.
Image Sparse Representation Based on a Nonparametric Bayesian Model
Authors: Ding Xing Hao , Chen Xian Bo
Published: September 2011

In recent years there has been a growing interest in the research of image sparse representation. Sparse representation based on over-complete dictionary become another hot topic in the field of image processing. In this paper a Nonparametric Bayesian model based on hierarchical Bayesian theory is proposed. In this model a sparse spike-slab prior is imposed on sparse coefficients and the Non-parametric Bayesian techniques based on sparse image representation are considering for learning dictionary. Proposed model can learn an over-complete dictionary from original image. Furthermore, the unknown noise variance can be estimated from noisy image. As regards to the image sparse representation, proposed model obtains good sparse solution. Comparing to other state-of-the-art image sparse representation method, this model obtains better reconstruction effects.
A SLAM Model Based on Omni-Directional Vision and Odometer
Authors: Wang Yu Quan , Li Ying Hong
Published: September 2011

A new SLAM measurement model based on omni-directional vision and odometer is proposed in this paper. A virtual stereo vision composed of an omni-directional vision sensor and an odometer. Scale Invariant Feature Transform is used to extract stable and available vision features from the omni-images. The 3-D locations of these features are initialized by the pixel coordinates and the odometer data by stereo projection, and the locations will be corrected during the SLAM process when they are observed again. It is demonstrated that the new model can make a good accuracy with FastSLAM algorithm, and the accuracy is greatly improved corresponding to the classical vision sensor.
Study of the Light Source Affects the Second Order Moiré Fringe Quality of Nano-Grating
Authors: Ma Xiu Shui , Sun Xiao Ji , Zhong Wei Hong , Guan Hong Wei
Published: September 2011

Two groups of indicator grating and scale grating produce two groups of first order Moiré fringe. Two groups of first order Moiré fringe interfere and produce second order Moiré fringe, and then by signal measurement and subdivide to the second order Moiré fringe, we can achieve nanometer accuracy. In which, the quality of the second order Moiré fringe has important influence on the quality of the nano-grating quality. In the second order Moiré fringe formation process, the characteristic of light source, the manufacture and assembling accuracy of scale grating and indicator grating and optical system, interference and noise etc. have an important influence on the quality of the second order Moiré fringe. This paper study the change of light source properties which formed the second order Moiré fringe to the quality of the second order Moiré fringe based on Lighttools software simulation. In order to provide a theoretical evidence for optimize design of the light source.
Laser Doppler Velocimetry with Small Wavelength Sensitivity Using Planar Lightwave Circuit
Authors: Maru Koichi , Fujii Yusaku
Published: September 2011

Using a semiconductor laser as a lightsource of a laser Doppler velocimeter (LDV) is desirable to reduce the size and the cost of velocity measurement equipment. However, typical inexpensive semiconductor lasers suffer from the problem of instability in lasing wavelength. In this paper, LDVs with small wavelength sensitivity are reviewed. The wavelength sensitivity can be reduced by using arrayed waveguide gratings (AWGs), Mach-Zehnder interferometers (MZIs) or cascaded MZIs. These structures can be formed by planar lightwave circuit (PLC) technology. The principles and the possibility for realizing wavelength-insensitive operation are discussed.
Effect of Suspension Parameter Uncertainty on the Dynamic Behaviour of Railway Vehicles
Authors: Mazzola Laura , Bruni Stefano
Published: September 2011

The paper describes a study carried out by Dipartimento di Meccanica Politecnico di Milano, aimed at investigating how uncertainty in railway vehicle suspension components can be treated in the framework of vehicle design and performance assessment in respect to vehicle dynamics. In railway vehicle suspensions, sources of parameter uncertainty may arise from inaccuracy in the modelling of a vehicle component or from a scatter in the behaviour of nominally identical components, on account of the variability implied by the component manufacturing process. The approach proposed in this paper, completely new to the railway field, is to use statistical methods having different complexity (and entailing a proportional computational effort), to analyse the propagation of uncertainty from the parameters input in the vehicle mathematical model to the results of running dynamics, in terms of the assessment quantities used for verification and evaluation of train performances. The problem is treated by numerical means, being the dependency of simulation outputs from the input parameters typically non-linear, and not defined in an analytical form.
Approaches for Assessment of Non-Determinism in Different Stages of Engineering Product Design Using Finite Element Analysis
Authors: Vandepitte Dirk , Moens David
Published: September 2011

Development of a complicated technical problem encompasses different successive decisions that are based on techical analysis and engineering judgment. In each of these steps, somedegree of non-determinism is inevitable. The paper discusses different types of non-deterministic parameters that may be relevant in different stages of engineering analysis. The entire cycle of development of a product is considered, and it is shown that the relevance of methods isdifferent in different stages of the development cycle. A classiﬁcation of different types of non-deterministic properties is presented. Based on the nature of these different classes of model properties, it is discussed to what degree each of these ﬁts in the framework of either a probabilistic or a non-probabilistic concept.The availability of realistic data in an appropriate format is another issue that should be taken into account. A validated probabilistic representation is usually only possible after an extensive campaign of data acquisition has been conducted, or at least after suffcient data have been collected to allow for a reliable estimation of a statistical model. A study of scientiﬁc literature shows that validated information is not always available. A general conclusion is that probabilistic methods are applicable in later stages of development, when a suffciently large database of product data has been gathered. Probabilistic approaches are perfectly suited for conditions when the product is already in service. Possibilistic analysis on the other hand is best suited for application in cases when the data set about the product at hand is still incomplete.
Wheel-Rail Contact Point Calculation of Flexible Wheelset Base on Wheel-Rail Contact Line Method
Authors: Gao Hao , Dai Huan Yun
Published: September 2011

Elastic deformation of wheelset should be considered for wheelset dynamic research. In this article, a new wheel-rail contact point searching algorithm that can be used for flexible wheelset simulation was developed based on wheel-rail contact line method. For given position and deformation of wheelset, normal vectors of a point on each rolling circle and its project on rail were calculated to find out possible contact point, which formed wheel-rail contact line. The final contact point was determined by minimum vertical distance of contact line and rail section profile. Rigid-flexible coupling dynamic equations of single wheelset were established and dynamic simulation was executed. The impact of wheelset deformation on wheel-rail contact position and creepage were discussed. Comparison of rigid and flexible wheelset results show that the new method gets more accurate contact point position.
Dynamic Responses of Time-Dependent System of Long-Span Suspension Bridge and Train under Wind Load
Authors: Tang Jun Feng , Guo Xiang Rong , Liu Yu Feng
Published: September 2011

A finite element method of space vibration analysis of the time-dependent system of long span suspension bridge and train under wind load is put forward in this paper. The correlation coefficient of wind along long span bridge is taken into account to simulate the wind speed curve in every point along the bridge. The matrix of space vibration equations of the time-dependent system of train and bridge are assembled by the principle of “Sit in the right place”. We calculate and analyze the critical wind speed of the train both from aspects of safety and riding comfort. Taking into account the effect of rail irregularity, wind action and various kind of nonlinear factor etc, we made a detailed vibration analysis for the system of bridge and train, and obtained the warning wind speed and bridge-closed wind speed when trains running on the bride.
Analysis on Overturning of Single Pier Bridge and Reinforcement Design Method
Authors: Huang Guo Yong , Lan Chang Qing , Lan Xu
Published: September 2011

With the lesson from the overturning accident of single-pier bridge and based on the analysis on the size and distribution mode of the load on the bridge surface when the ramp bridge of Tianjin segment in the Jin-Jin Expressway collapsed, this Article drafts the load size and distribution mode are (possibly undertaking up to 4x165t load) studied out for analysis and design of single pier bridge of pier-girder consolidation for the analysis on the calculation of the overturning resistance for single-column girder, and analyzes the overturning resistance capacity of single-column girder with pier-girder consolidation according the planned load size and distribution mode. In addition, this Article proposes the reinforcement measures by adding the column supports at the horizontal direction of the single-column pier, thus effectively improving the overturning resistance capacity of main girder. This Article may be used as the reference for the study of overturning resistance and the reinforcement of single-column pier bridge.
A Numerical Investigation on Reduction of Fluid Force on Three Dimensional Circular Cylinder with Tripping Rods
Authors: Zhou Chao Ying , Ji Wen Ying , Zhang Xing Wei
Published: September 2011

The effects of tripping rods on characteristics and fluid forces acting on a single cylinder was three-dimensional numerical studied in a low laminal flow at a Reynolds number of 200 and a subcritical stream at a Reynolds number of 5.5X104. The angular position of the tripping rods was varied from 20 to 60.The results reveal that there exits an optimum position of tripping rod for reducing fluid forces. This optimum angular position was found to be 40° for Re=200 and 30° for Re=5.5X104. At this optimum angle, the steady drag, fluctuating drag and fluctuating lift forces acting on the cylinder are reduced by 21%, 32%, and 28% for Re=200 and 36%, 44%, 76% for Re=5.5X104.
Degenerative Permafrost Engineering Geology Features Analysis and Forecasting of National Road 214
Authors: Liu Ping De , Wang Shuang Jie , Wang Cai Qin , Jin Long
Published: September 2011

The paper is based on information of permafrost engineering geology of National Road 214, and for a comparative, analysis the permafrost engineering geology features of National Road 214, Including permafrost ground temperature, ice content, natural permafrost table and artificial permafrost table; Then Summary the distribution of permafrost of National Road 214, including Southern limit of permafrost and Northern limit of permafrost, Then get one conclusion; Because of the outside temperature increase and under the influence of the role of the project, frozen ground temperature has rise trends, The permafrost along the road all tended to degenerate, Then summary its degeneration features of National Road 214, and analyze the reasons of the final degeneration; Final, combining the high-speed reconnaissance and design project National Road 214, Analysis the permafrost existing meteorological data and geological survey data, according to the frozen ice content and permafrost thickness, Then to predict and analysis permafrost degeneration tendency in numerical simulation.
Study on Energy Accumulation and Damage Evolution of the Coal and Rock Using Acoustic Emission Test
Authors: Wang You Gang , Liu Xiang Feng
Published: September 2011

Rocks and other rocklike solid materials have inherent defects inside. The defects of rock will be evolved under loading. The evolution process and extent of defects can be described by the damage variable. But which physical or geometrical parameters can be used to define the damage, there has no consistent conclusion domestic and aboard. Moreover, limited by the method of experimental, it is difficult to obtain the parameters to depict the damage variable directly. In order to obtained the evolution law of the interior defects in the solid material, the non-conduct geophysical prospecting measure as AE (Acoustic Emission) will be the leading measure to prospect the interior defects and it’s evolution under outside loading. In the present paper, the AE method was used to obtain the AE parameters during the uniaxial compression process of coal and rock. Therefore, uniaxial compression and AE tests on coal and mudstone were conducted, and the curves among the AE energy accumulation, stress and strain were obtained after analyzing the results of tests data. Based on the principle of damage mechanics and thermodynamics, the damage evolution of coal and rock was deduced through analyzing the experimental results, the curves of damage and AE accumulation were obtained also. By analyzing and fitting the curves of damage and AE energy accumulation, the relation between the AE energy accumulation and stress-strain was obtained and verified through the experimental data.
Study on Fatigue Properties of Double-Wall-Brazed-Tube
Authors: Zhu Qi Rong , Xie Ming Ru , Li Xiao Hua
Published: September 2011

This paper is referred to other literature on properties of metal fatigue testing methods and data analysis procedure methods. According to high cycle fatigue testing, double-wall-brazed-tube is loaded with different stimulated vibration force by shaking table and is forced to vibrate. In the experience, strain of key parts is measured with Electrical resistance Strain measurement Methods. By curve fitting of experimental data, we gain the fitting function of the specimen’s fatigue life and draw its S-N curve. In accordance with the analysis of experimental data and S-N curves, it is concluded that fatigue properties of metallic materials can not fully reflect fatigue properties of a specimen and that the cross-sectional size of a specimen has much effects on its fatigue life.
LC-Resonant and High-Temperature Resistant Acceleration Sensor Based on DSP
Authors: Guo Tao , Zhu Jie , Tang Gui , Xu Yan
Published: September 2011

It is a challenging problem to test the acceleration of the high-speed missiles and space shuttle under high temperature. This paper proposed a design of LC-resonant and high-temperature resistant acceleration sensors about the phenomenon. With the operational amplifier OP4177, it produces the input signal that contents with A/D (Analog to Digital) signal. An eight level low-pass filter MAX291 is used for testing after the signal is regulated. This design mainly uses AD7934 to complete the conversion from analog signals to digital signals. It also recognizes the resonant point of LC acceleration sensor by the DSP （Digital Signal Processing）recognizing program. The acceleration is computed finally by the DSP chip.
A 2D Meshless Solver Based on AUSM+ and MUSCL Scheme
Authors: Cai Xiao Wei , Tan Jun Jie , Ma Xin Jian
Published: September 2011

When solving Euler equations of fluid dynamics around complex configurations, a meshless method which doesn’t use the information of the meshes may have the advantages to simulate the flow field. In this paper, a simple and accurate meshless algorithm based on AUSM+ and MUSCL scheme has been described. To assess the capability for capturing shock position and the resolvability of the complex shock waves, a number of typical test cases are calculated with the meshless method. The results obtained are in good agreement with the exact solution or some high-resolution numerical method as well as flux-corrected transport (FCT) algorithm with adaptive mesh refinement (AMR) technique.
Simulation Study on Crack Propagation of Aero-Engine Blade
Authors: Yang Shuo , Zhang Jun Hong , Lin Jie Wei
Published: September 2011

This article simulates crack propagation problem of aero-engine blades under aerodynamic loads and centrifugal loads. Blades are critical parts in the aero-engine, fatigue fracture failure is the major failure mode for aero engine blade, one broke blade will result in serious accidents for the whole engine with great economic losses. This article finds out the location of fatigue crack source firstly according to the blade stress distribution. Then the paper calculates the stress intensity factor at crack tip for different crack length which is based on the finite element method and fracture mechanics, simulates the crack propagation path, and figures out the crack growth rate with Pairs model and FNK model .Finally this article predicts the crack propagation life.
Design and Fabrication of a Micro-Capacitor for Nano Probing System
Authors: He Ming Xuan , Lu Xin , Chen Xin , Ling Xing , Li Yuan , Wang Hong , Ding Gui Fu
Published: September 2011

Quantitative dimensional metrologies of Nano/microstructures are increasingly demanded following the rapid developments in, for instance, semiconductor and precision engineering industry, microsystem technology and materials science. In the recent years, coordinate measuring machines (CMMs) have become versatile and widespread metrology tools. Probing system is an important component of a CMM. A probing system based on a high accurate positioning transducer is crucial for micro and nano metrology. This paper presents a probing system based on a variable micro-capacitive transducer which has advantages of simple structure, low cost, high sensitivity, overload ability, excellent dynamic response characteristics, etc. The structure of variable capacitor was designed and optimized by means of finite element method (FEM), and fabricated by surface micromachining technology.
Dynamic Responses of the Powerhouse Structure of Hydropower Stations due to Hydraulic Excitation
Authors: Chen Jing , Ma Zhen Yue , Zhang Yun Liang
Published: September 2011

As the capacity and water head of large hydropower projects become higher and higher, the flow-induced structural vibration of powerhouse becomes a very important problem for the design and operation process. Especially as the water head and the running speed are much higher for the pump-turbine than the general turbine, the hydraulic exciting vibration is very remarkable. In this paper the simulation results of free-vibration characteristics of powerhouse structure for different types were concluded and the frequency behavior of the pressure fluctuation in spiral case and draft tube were discussed. The structural dynamic responses under hydraulic exciting were presented including the dynamic responses of displacement, velocity, acceleration and stresses. Based on the vibration criterion of the powerhouse structure, the vibration evaluation was made.
Modal Experiment Research on Fluid-Solid Coupling Vibration of Hydraulic Long-Straight Pipeline of Shield Machine
Authors: Xie Jing Hua , Tian Ke , He Li , Yang Tian Ren , Zhu Xiang Heng
Published: September 2011

The hydraulic long-straight pipeline system of the shield machine is to be studied in this paper. Modal parameters of the hydraulic long-straight pipeline whose length is 8m under three kinds of spans (single span, double spans and four spans) were measured and analyzed. Considering the inherent vibration characteristics of the shield machine, we limited the natural frequency of the multi-span long straight pipeline studied within the range of 0~ 200Hz.What the experiment shows is as follows: Firstly, the natural frequency of the hydraulic long-straight pipeline is densely distributed mainly in the low frequency; Secondly, the natural frequencies of vibration in the horizontal plane are slightly higher than those of corresponding orders in the vertical plane, although the difference is little; In addition, by increasing the number of supports, pipeline span can be reduced and the natural frequencies of pipeline can be significantly increased, but this will make the vibration mode change irregularly.
Simulation of Oscillation Response of Free-Standing Object under Earthquakes
Authors: Zhou Qian , Yan Wei Ming
Published: September 2011

To protect free-standing object,a rectangular object is taken as example and by SIMULINK technique its oscillation response under earthquakes were studied.Based on static and dynamic balance theories,oscillation conditions as well as motion equations of the free-standing object under earthquakes were deduced;Based on SIMULINK model,simulation analysis on the object under both level and vertical earthquakes were carried out,parameters such as initial conditions,earthquake intensity and ratio of width of the object against its height (B/H) and so on were discussed.Results show that under earthquakes oscillation conditions of the object relate closely to B/H,earthquake intensity and friction coefficient between object and its base;Under earthquakes oscillation response of the object is sensitive to initial conditions,and the response becomes more serious under less B/H or larger earthquake intensity conditions.Besides, SIMULINK technique can effectively simulate oscillation response of free-standing object under earthquakes,which proves the technique useful.
Dynamic Simulation of Remote Control Weapon Station Servo System Based on Virtual Prototype Technique
Authors: Mao Bao Quan , Wu Yong Liang , Wang Chuan You , Fang Xue Long
Published: September 2011

Servo system is a very important part of Remote Control Weapon Station , its accuracy has considerable impact on the performance of armament system. This article analysis the stucture compositon of the machine gun RCWS servo system, and elevating servo system is simplified and model is assumed. Virtual prototype model is built using Admas though adding constraints and loads; Elevating servo system model is built using Admas and Matlab/Simulink; Simulation analysis for tracing precision is conducted in the process of firing, tracing precision error and maximam removing velocity are got ,and that meet the general requirements of system design ,which verify the credibility of the model. This model has remarkable thoery and pratical meaning in the study of RCWS servo system design.
Influence of Worn Tread on EMUs Dynamic Performance and Passenger Comfort
Authors: Sun Xiao Jie , Lu Zheng Gang , Zhou Wen Xiang
Published: September 2011

The tread wear would change the wheel/rail relation and seriously affect the railway vehicle dynamic behaviors. After testing the several EMUs under running ,this paper not only analyses the discipline of tread wear, but also computers the influence on wheel/rail contact geometry by a program devopled in Matlab/GUI. A MBS model of trailer of EMUs is constructed, including the model of passagers. The dynamic performance of EMUs and riding comfort are compared among the standard, worn and turned tread profile. We draw the following conclusions：Tread profile after running for a long time without turning would emerge harmful concave worn；The unsymmetrical wheel/rail contact would increame the risk of derailment and debase passengers comfort of EMUs；After turning , the dynamic performance of EMUs can be improved.
An Investigation of Acoustic Similarity on an Underwater Structure
Authors: Wang Yong Fu , Zhou Qi Dou , Xie Zhi Yong , Lv Xiao Jun
Published: September 2011

An acoustic similarity due to two geometrically similar structures which are vibrating in heavy flow, such as in water, is investigated. The acoustic similarity states that for two geometrically similar structures, if a group of dimensionless similarity numbers are constant, the dimensionless acoustic pressure coefficient keep constant at the corresponding acoustic field points for the two flow–loaded vibrating structure systems. Numerical simulations and experiment results are presented to validate the acoustic similarity. This acoustic similarity may be useful when a small structure is employed to investigate the acoustic performance of large scale structure.
The Influence of Turbulence Integral Scale to Buffeting of Long-Span Bridge
Authors: Xiao Yi Qing , Hu Gang , Tu Meng Qi , Zheng Rui Qi
Published: September 2011

In this paper, the influence of turbulence integral scale to buffeting responses of long-span bridge is analyzed by adopting 2-D buffeting theory. One cable-stayed bridge and one suspension bridge are selected as analysis object. Buffeting responses are calculated under two different wind speeds and different size of turbulence integral scales, which range from 10m to 80m in this paper. The numerical results show that buffeting responses do not change with turbulence integral scale linearly and when turbulence integral scale increases to one value, buffeting responses reach a peak. In addition, turbulence integral scale corresponding to peak value of buffeting responses rise with growth of wind speed.
Finite Element Modeling and Modal Analysis of Bolted Joints
Authors: Ge Jian Li , Wang Yan Zhi , Hao Jian Wei , Yang Guo Lai
Published: September 2011

In order to properly simulate bolted joints and make the numerical modes as accurate as possible, this paper is focused on modeling methods for dealing with bolt connection structures composed of two sheets. Six methods are presented to establish the FE models using different element types(8-node brick elements and 4-node shell elements) and different constraints (such as contact interaction and coupling constraint). The models are solved in ABAQUS software and natural frequencies and vibration shapes are obtained. Then, the experiments of bolt fastening structures are performed and FE simulation results are compared with the experimental ones. Moreover, the methods which agree well with the experiments are selected as the FE model of bolted connection. Finally, the element layers in the through-thickness direction are discussed. FE models built in this paper can reflect the real situation of bolted joints and provide significant reference to FE analysis for the complex system connected by bolts.
Stress Transferring Mechanism and the Bearing Capacity of Joints between Concrete-Filled Square Steel Tubular Special-Shaped Columns and Steel Beams
Authors: Chen Xi
Published: September 2011

In recent years, a new type of frame consisting of steel beam and concrete-filled square steel tubular special-shaped column is increasingly widespread. Compared with the joint of ordinary reinforced concrete special shaped frame, the joint between concrete-filled square steel tubular special-shaped columns and steel beams has the advantage of better ductility, higher loading capacity, uncomplicated reinforcement disposing and convenience in construction. This paper indicates that the joint has strong energy dissipation capacity and high loading capacity, and the use of diaphragm is effective to enhance the structural performance of the joints. Stress transferring mechanism in the joints is discussed, and the calculating model of the shear strength of panel zone is established. This study is helpful for further study of the design and use of the joint between concrete-filled square steel tubular special-shaped columns and steel beams.
Discussion on the Construction of Accounting Informatization in Internet Era
Authors: Tang Xiao Qin , Kang Yan Yu , Yan Chun Lan
Published: September 2011

Speed up the construction of accounting informatization is an important measure to implement national informatization developing strategy. This paper discusses the importance of accounting informatization construction, emphatically analyzes the problems and solutions in the construction of accounting informatization, looks forward to providing reference value for enterprises accelerating the informatiztion construction and enhancing the level of accounting.
Impact Assessment of Job Machine Factors on Scaling Parameters
Authors: Chen Yan
Published: September 2011

Composite dispatching rules are of great importance in solving realistic scheduling problems because they are fast and easy to implement. The successful implementation of composite dispatching rules depends on their scaling parameter values, while further the appropriate scaling parameter values are determined by specific problem instance features, i.e. job machine factors. In this paper, a Face-centered Cube experimental design is proposed to study the impact of job machine factors on scaling parameter values when Apparent Tardiness Cost with Setups (ATCS) rule is used to schedulePm|sjk|ΣwjTjproblem. The dynamics between the job machine factors and the good scaling parameter values are revealed by experimental results.
Investigation of Real-Time Cardiac Monitoring Robert Based on CDMA Technology
Authors: Li Gen Song , Zhang Fu Li , Yang Hua Zhe , Hong Yang , Hu Qing Zhe
Published: September 2011

The real-time cardiac monitoring Robert is devised and prepared and electrocardiogram (ECG), heart rate, phonocardiogram (PCG) and dynamic three-dimensional echocardiography of a person can be recorded and displayed through touching the ECG signal acquisition sensor on the hands of the Robert. Furthermore, the CDMA wireless communication platform is adopted to transmit the difficult ECG to the service center, followed by diagnosing the ECG by doctors and transmitting the feedback diagnostic results. I-lead ECG of the person can be recorded by the amplification circuit with high gain and low noise. Then, the heart rate and output phonocardiogram are displayed and the model of heart beat is transmitted to the service center via CDMA platform. The displayed ECG is clear, and the stimulated heart beat is synchronous, which makes the person know his own heart information. Furthermore, ECG received by the service center is in accordance with the one recorded by the Robert.
Removal Properties of Nitrogen and Phosphorous in Eutrophic Water with Periphyton Attached by Artificial Substrate
Authors: Li Ding Long , Lu Hong , Chen Qian , Chao Jian Ying , Kong Xiang Ji , Zhang Yi Min
Published: September 2011

Removal properties are researched and discussed of algae and nitrogen & phosphorus nutrients with periphyton by assembled substrate in lake-based eutrophic water body, including impacts on removal effects of several physical & chemical properties as water depth, water velocity, DO, temperature and PH. The results show that: the removal rate of NH4-N, other nitrogen nutrients, phosphorus nutrients and Chl-a were 96%, 40%, 80%, 65% respectively. With the growth of water velocity(from 0 to 200L/h ), the removal of Chl-a, TP, TDP increased to a certain extent（Chl-a: from 63.63% to 67.66%; TP:from 76.15% to 85.13%;TDP:from 80.10% to 88.44%）,and that of TN,TDN and NO3-N decreased to different extents（TN: from 45.19% to 31.97%; TDN: from 42.81% to 28.77%; NO3-N: from 38.11% to –5.26%）, but that of NH4-N and PO4-P altered little(NH4-N：from 96.80% to 95.94%；PO4-P：from 85.38% to 87.02%). It will provide reference for recovery and re-contribution of destroyed Eco-system, and a new thought for treatment in eutrophical lakes.
Strain Distribution Characteristics in the Rolling Process of Shaped Wires
Authors: Wang Bo Jian , Zhang Wu Peng , Wang Yong Jie
Published: September 2011

Based on the deformation features in the rolling process of shaped wires, this paper focuses on the metal flow rules and distribution characteristics of stress and strain through simulating the shaping process by DEFORM-3D. The equivalent stress and equivalent strain is in the same distribution: smallest on the base and gradually increasing along the broadening direction and highest on the tooth. A satisfactory concordance between the scattering of the hardness values measured over the wire sections and that of the equivalent strain is found, thus verifying the accuracy and the reasonableness of the simulation process.