bluuebunny/crossref_metadata_2025 huggingface dataset:
Outcomes of 25-Gauge Pars Plana Vitrectomy in the Surgical Management of Proliferative Diabetic Retinopathy
Authors: Schoenberger Scott D. , Miller Daniel M. , Riemann Christopher D. , Foster Robert E. , Sisk Robert A. , Hutchins Robert K. , Petersen Michael R.
Published: September 2011

BACKGROUND AND OBJECTIVE:

To report outcomes and complications of 25-gauge pars plana vitrectomy (PPV) for patients with complications of proliferative diabetic retinopathy (PDR).

PATIENTS AND METHODS:

Retrospective, interventional, consecutive case series of 174 eyes undergoing primary 25-gauge PPV for PDR from 2006 to 2009. Primary outcomes were visual acuity changes and rates of postoperative complications.

RESULTS:

Visual acuity improved from 20/187 before to 20/69 after surgery (
P
< .0001). Postoperative vitreous hemorrhage occurred in 38.7% of eyes and 10.4% of all eyes required another PPV for non-clearing vitreous hemorrhage. Complications included limited choroidal effusion (5.2%), rhegmatogenous retinal detachment (4.6%), hypotony, rubeosis, and ocular hypertension (4.1%), neovascular glaucoma (2.3%), hyphema (1.2%), and phthisis bulbi (0.6%).

CONCLUSION:

The authors found 25-gauge PPV to be effective for vitreous removal and membrane dissection. The spectrum and frequency of complications were similar to those reported for 20-gauge PPV for PDR. In the surgical management of PDR, 25-gauge PPV is an alternative.
A Lateral Approach to Lower Eyelid Entropion Repair
Authors: Then Siew-Yin , Salam Aysha , Kakizaki Hirohiko , Malhotra Raman
Published: September 2011

The authors describe a simple technique that highlights the use of the sagittal anatomy of the lower eyelid to aid identification of the retractors during involutional entropion repair. This anatomy is exposed following lateral canthotomy and inferior cantholysis. The orbital septum is seen to enclose the fat pad and fuse with the retractors above it prior to insertion into the tarsus. The septum, orbicularis, and skin are incised from the lateral approach, allowing exposure of the retractors for tarsal reattachment, and the procedure is completed with a lateral tarsal strip. Forty-eight procedures in 42 patients with involutional entropion were performed using this technique and 90% and 89% of primary and recurrent entropion, respectively, were successfully repaired. Mean operating time was 30 minutes. The lateral approach to a standard procedure for entropion repair can reduce operating time and technical difficulty.
Influencia de la composición química de diferentes chatarras de acero sobre las propiedades mecánicas de la fundición con grafito esferoidal
Authors: Asenjo I. , Larrañaga P. , Garay J. , Sertucha J.
Published: September 2011

Se han seleccionado diferentes chatarras de acero comerciales, con el fin de analizar las implicaciones de su utilización como materias primas y evaluar su aplicabilidad en la fabricación de piezas de fundición con grafito esferoidal. Estos aceros muestran una gran variabilidad en su composición química, dependiendo principalmente de su origen y naturaleza. Se han determinado los elementos químicos aportados por estos materiales y se han estudiado sus efectos sobre las características estructurales y las propiedades mecánicas de piezas test con diferentes morfologías y tamaños. El elemento de aportación más importante es el manganeso, el cual está presente en todos los aceros seleccionados en concentraciones superiores al 0,2 %. Otros elementos son: cobre, cromo, estaño, titanio y vanadio. Todos ellos, salvo el titanio y vanadio, originan aumentos en los contenidos de perlita en la matriz metálica, por lo que pueden ser utilizados para producir piezas con estructuras perlíticas y/o ferrítico-perlíticas. En ningún caso se ha detectado la formación de carburos.
Estudio de corrosión galvánica en pares latón/acero inoxidable y latón/fundición de hierro
Authors: Ohanian M. , Díaz V. , Corengia M. , Zinola C. F.
Published: September 2011

El ataque por corrosión en los sistemas intercambiadores de calor constituye un problema para el mantenimiento de cualquier planta industrial. Se trata de sistemas multigalvánicos con particular complejidad geométrica y fluidodinámica. Las patologías corrosivas incluyen el fenómeno de dealeación selectiva de cinc en las aleaciones de cobre. A fin de explicar un caso particular de ataque por decinficación (deterioro en placa de intercambiador de calor de tubos de inoxidable), el presente trabajo aborda en ensayos a escala de laboratorio, la caracterización e interacciones entre dos aleaciones de cobre y cinc, (Yellow brass –UNS C268– y Admiralty brass –UNS C443–), respecto a acero inoxidable AISI 316 y fundición gris de hierro. Los ensayos se realizan a 20 °C en disoluciones de NaCl 1,5 % y Na2SO4 1,5 % y pH 8. Se caracterizan electroquímicamente las aleaciones y materiales involucrados mediante barridos potenciodinámicos. Los pares galvánicos formados se analizan mediante el estudio de sus corrientes de acoplamiento. Se concluye acerca de la causa de la patología analizada y de los rangos de potencial de protección de latones y su compatibilidad de acoplamiento con otros metales.
USING DIFFERENT ENTROPIES TO ANALYZE THE HEART RATE VARIABILITY OF CONGESTIVE HEART FAILURE PATIENTS
Authors: Lee Ren-Guey , Hsiao Chun-Chieh , Kao Chieh-Yi
Published: September 2011

The purpose of this paper is to show the influence of congestive heart failure (CHF) on heart by using different entropies to apply on the group of patients with CHF and normal group. Three different entropies are used: approximate entropy (ApEn), multiscale entropy (MSE), and base-scale entropy (BsEn). We use these three entropies to measure the complexity of the heart rate variability (HRV) and also use analysis of variance (ANOVA) to analyze the result of entropies to discuss the feasibility of recognizing CHF patients by utilizing entropies. With the analysis results of different entropies, the influence of CHF on heart has also been clearly demonstrated. The results on the approximate entropy show that the normal young group has a higher approximate entropy value while the CHF group has a lower value. This can be explained as a healthy, strong heart that can change its heart rate freely to adapt the change of the environment or the needs of the human body, therefore the HRV will be more complex. From the ANOVA results of approximate entropy, it can be observed that the F value is larger than 1, but is still small. In other words, the approximate entropy can be used to distinguish the three groups, the effect is, however, not good. It is hard to recognize a CHF patient by using approximate entropy.
A Novel Feature Extraction Method for Mechanical Part Recognition
Authors: Cao Su Qun , Yang Ge Lan , Zhu Quan Yin , Zhai Hai Fei
Published: September 2011

Mechanical part recognition has great significance in automated sorting and processing. The core of mechanical part recognition is the part image feature extraction. Thus, how to extract part features to meet the real time requirements for the automated production line has a crucial role. A novel feature extraction algorithm is presented for part image features in this paper. It aims to optimize the fuzzy Fisher criterion function to figure out two orthogonal optimal discriminant vectors in an unsupervised way. Based on these two vectors, the linear transformation from d-dimension to 2-dimension can be obtained. Experimental results on three mechanical parts show its effectiveness.
Control of Direct-Drive Compressor Based on Variable Structure Sliding Mode
Authors: Zhong Mei Peng , Huang Feng Li
Published: September 2011

In order to reduce vibration a new variable structure sliding mode control strategy was proposed in direct-drive air compressor,because torque fluctuate of direct-drive air compressor is large. In order to reduce volume and economize energy, direct-drive air compressor dived by permanent magnet synchronous motor(PMSM). Mathematics model of air compressor torque was built up, and load of air compressor was analyzed. Mathematics model and torque equation of PMSM were built up. Variable structure sliding mode to PMSM was built up. Basing on characteristic to control of PMSM and load of air compressor, the system was simulated in simulink. The result shows that rotate speed fluctuate of direct-drive air compressor controlled by variable structure sliding mode is less than that of direct-drive air compressor controlled by PI. The test of direct-drive air compressor dived by PSMS was done. Experimental results verified that variable structure sliding mode control strategy improve dynamic quality of system and has good robustness. Volume a of Direct-drive air compressor dived by permanent magnet PMSM are little, and its efficiency is high.
Open Problems in Deadlock Control for Flexible Manufacturing Systems by Using Petri Nets
Authors: Li Zhi Wu , Al-Ahmari Abdulrahman M.
Published: September 2011

Deadlocks are a rather undesirable situation in a highly automated flexible manufacturing system. Their occurrences often deteriorate the utilization of resources and may lead to catastrophic results in safety-critical systems. This work surveys the open problems in deadlock control for automated manufacturing systems. The focus is deadlock prevention due to its large and continuing stream of efforts. A control strategy is evaluated in terms of computational complexity, behavioral permissiveness, and structural complexity of its deadlock-free supervisor. This study provides readers with a conglomeration of the open problems in this area and facilitates them in finding a suitable topic for their research.
The Experiment Device Design of LPG Fire Radiation
Authors: Li Yu
Published: September 2011

Liquefied petroleum gas (LPG) is an important energy which is widely used in various fields of the national economy, and is one of the top 10 dangerous chemicals with inflammable, explosive dangerous. According to the need of LPG combustion and rescue, a set of LPG fire radiation experiment device was designed. The temperature and heat radiation flux of LPG flame can be gotten under different pressures and flow rates. The design is benefit for combustion and and emergency rescue research of large LPG tanks.
An Automatic Designing Method for Apparel
Authors: Wang Xiao Gang , Zheng Qin , Li Xin Zhan
Published: September 2011

In this article we discuss a new method for describing the 3D shape of woman warm jacket and set up its mathematic model, which is by dint of body scanning technology. Telmat scanning system scanned samples. The scanning point cloud were analyzed in horizontal and vertical sections. Outlines of vertical sections were described and mathematic models were set up. The result helped to prognosticate the shape of woman warm jacket. A new describing method for 3D shape is discussed. And it opens our mind to utilize body-scanning technology for deeper science research.
Research on Control Strategy and Experiment of Electronic Mechanical Continuously Variable Transmission
Authors: Zhang Lei , Zhai Yan Chun , Zhao Hai Xin , Chen Guan Jin
Published: September 2011

Nowadays, most of continuously variable transmissions (CVT) adopt hydraulic system to exert pressure on the cone-plate, in order to realize variable speed control. Electronic Mechanical Continuously Variable Transmission (EMCVT) studied in this paper, however, used rolling screw mechanism instead of the energy-hungry hydraulic system. Mechanical speed governor controlled by electro was adopted in EMCVT to regulate speed, which not only reduced the automobile’s fuel consumption, but also brought down the transmission’s manufacturing cost and failure rate obviously. Further study on the ratio control strategy of EMCVT was made and digital PID control algorithm with target ratio tracing was raised. Moreover, an improved PID control algorithm, that was integral separation and differential precession algorithm, was given. Platform experiment of EMCVT was finished, thus, the functionality and rationality of this transmission’s mechanical structure was proved, so was the feasibility and rationality of the speed ratio control strategy.
Modeling of Impact Behavior of Lightweight Composites under Metallic Projectile
Authors: Asadi Ali , Sadough Seyedali Ali
Published: September 2011

The purpose of this article is studying the behavior of lightweight composites under metallic projectile by stress wave and comparing the results with numerical simulations. The target includes external layer, Alumina ceramic layer and supportive layer. The impact velocity of the projectile is 500 m/s. In this article, two lightweight composite targets with polymeric supportive layer and metallic supportive layer are studied. The results of numerical simulations and classic theory of stress wave propagation are in good agreement. The effect of changing supportive layer material and time of stress wave propagation into layers by the results of modeling is also studied.
A Push-Back Sequencing Model for Production Planning in Open-Pit Coal Mining
Authors: Gu Xiao Wei , Wang Peng Fei , Wang Qing , Zheng You Yi , Liu Jian Ping , Chen Bin
Published: September 2011

A dynamic sequencing method has been developed to simultaneously optimize the coal production rate, waste stripping rate, mining sequence, and mine life of an open-pit coal mine. The method first establishes a geological seam model of a bedded coal deposit which estimates the relevant attributes of coal seams at the center of each block on the X-Y plane. Based on the seam model, a sequence of “geologically optimum push-backs” is generated in the final pit. The geologically optimum push-backs are then put into a dynamic sequencing model and economically evaluated. The best production schedule which has the highest NPV is obtained, which indicates the best quantities of coal and waste to be mined in each year, the best zone to be mined in each year, and the best number of years to mine the entire final pit.
Interactive Dynamic Schedule Rapidly on Steel Making-Continuous Casting
Authors: Zhao Ning , Liang Yan
Published: September 2011

To make interactive Steel making-Continuous casting schedule more speedy and reasonable, the key difficulty of Steel making-Continuous casting was analyzed first. Planning and adjustment of schedule were investigated then, restrict muster was built to ensure correctness of static schedule, interactive based on GANTT chart was adopted to ensure quickly adjustment of static schedule, adjustment algorithm was built to ensure schedule adjusting more reasonable and speedy. Finally, Steel making-Continuous casting schedule tool was developed, the interactive schedule way in Steel making-Continuous casting were brought out.
The Boiler Temperature Field Reconstruction Algorithm Based on Genetic Algorithm
Authors: Li Cheng Zhi , Shao Fu Qun , Kan Zhe , Fan Hai Xiang
Published: September 2011

The traditional power station boiler temperature field reconstruction algorithm is sensitive to the time of flight. In the boiler movement, the temperature field has symmetric distribution feature within the boiler. On the basis of the boiler temperature field reconstruction fundamental by using the acoustic method, the paper presents a new two dimension temperature field reconstruction algorithm, which combines the single path method and genetic algorithm. Firstly, the algorithm makes sure the temperature distribution by using single path function. It uses the points denote the temperatures on each path, and plots the mesh, which can represent the temperature preliminary distribution, by using the Bezier spline principle and linear multistep integration. Finally, the surface mesh is Interpolated and fitted by using genetic algorithm. The experimental result proved that, compared to the least square method, the new reconstruction algorithm has the feature of higher accuracy and higher reconstruction speed.
Robust Design in Injection Molding Processing Based on Multi-Objective Ant Colonies Algorithm with Crossover and Variation
Authors: Huang Feng Li , Zhong Mei Peng , Gu Jin Mei , Liu G.W.
Published: September 2011

Based on single objective robust design of injection molding process, a bi-objective robust design model based on mean and standard deviation of molding quality and a multi-objective ant colonies algorithm with crossover and mutation based on Pareto optimization are proposed. Aimed at the craft parameters of plastic injection for the top and down shell of remote controller, a model of bi-objective robust design based on mean and standard deviation of warpage quantity is established with an example. And the model is solved by multi-objective ant colonies algorithm of crossover and mutation. The result shows that partial performances of algorithm are superior to that of NSGAII. The actual plastic injection was done by means of the parameters which were gotten by multi-objective robust optimization. The quality of plastic parts was high, and the fluctuation was small.
Modeling and Numerical Optimal Simulation of Coal Pillar’s Failure Process on Longwall Leaving Coal Pillar Mining
Authors: Shao Xiao Ping , Xia Yu Cheng
Published: September 2011

To further optimize mining methods and parameters at regions of “protecting water mining”, this paper has made modeling and numerical optimal simulation of coal pillar’s failure process under two kinds of mining method including “taking 8 remaining 7” leaving the region pillars and “taking 12 remaining 8” leaving strip coal pillars for Yubojie coal mine in northern Shaanxi province in China. Simulation showed that the stability of strip coal pillars is better than the region coal pillars at the same advancing distance. The region coal pillars first appeared corner plastic failure and maybe become hexagonal pillars. Plastic failure of the rectangular pillar extended and penetrated from the corner along the edge. Plastic damage of pillars showed tendency from the middle to the roadway side of the face along the length direction of face. Stability of central elastic core of coal pillar is the basis of pillar stability. Simulation results showed that it is feasible to optimize mining methods and parameters of “protecting water mining" areas based on modeling and numerical simulation of pillar failure process. The method has provided a useful reference to mining method and optimization design research for other regions with same type of domestic and international coal mines.
Numerical Simulation and Technology Research on the Precision Forging for Inner Ring Gear
Authors: Li Liang
Published: September 2011

Rigid-viscoplastic finite element method was used to analysis the cold extrusion of the external boss and ring gear. Some groups of numerical models were built with different design parameters of die, geometric parameters of gear, processing conditions, and the service loads were investigated. Form the investigation; we predicted the forming defects occurring in the practice. Based on Archard model the lives of dies were predicted. The conclusion above has more guidance to the production.
Study on Model and Method for Production Scheduling on Hot Rolling Section
Authors: Yang Ye Jian , Jiang Ze Yi , Zhang Xin Xin
Published: September 2011

According to the technical demand of hot-rolling production in steel plant, a production scheduling mathematical model was proposed with the aim of reducing the production cost and optimizing the product quality. The scheduling of reheating furnaces which was summed up as the Boolean satisfiability problem was involved in rolling scheduling optimization which was summed up as the multiple traveling salesman problem with uncertain traveling salesman number, and a two-stage genetic-tabu algorithm was designed to solve the problem. It was shown that, the model could fully meet the demand of hot-rolling production. Compared to the human-computer method, the results had better performance on high production and energy efficiency.
Performance Analysis of Dual Vt Domino Circuits with P-V-T Variations
Authors: Wang Jin Hui , Gong Na , Liu Gang , Geng Shu Qin , Wu Wu Chen
Published: September 2011

The leakage current, active power and delay characterizations of the domino circuits in the presence of P-V-T (Process, Voltage, and Temperature) variations are analyzed based on multiple-parameter Monte Carlo method. It is demonstrated that failing to account for P-V-T variations and process-electro-thermal couplings can result in significant inaccuracy in transistor-level performance estimation. It also indicates that under significant P-V-T variations, DTV (Dual VtTechnology) is still highly effective to reduce the leakage current and active power for domino circuits, but induces speed penalty. At last, the robustness of different domino circuits with DTV against the P-V-T variations is discussed.
Design of Absolute Magnetic Grid Displacement Sensor Based on Encoding Principle
Authors: Liu Ji Zhu , Hao Shuang Hui , Chen Tao
Published: September 2011

A new kind of magnetic grid absolute linear displacement sensor is introduced. The displacement measuring method of two new kinds of magnetic grid sensors for single-row and double-row magnet are also proposed in this paper. The double-row magnet sensor is composed of the look-up table column and encoding column, the look-up table column achieves the calculation of relative displacement within a cycle. Precision of the double-row magnet sensor is analyzed and the resolution can reach 0.75µm. The displacement measurement of single-row magnet is realized by adding Hall group based on the encoding column. The signal is processed according to the voltage curves induced by multi-group of Halls.
Study on Surface Roughness Based on Dynamic Minimum Thickness of Cut
Authors: Ji Cai Kuai
Published: September 2011

The relationship of the friction coefficient and the MTC were discussed, and the MTC and its effects on surface roughness were a theoretical analysised and experimental verification by AFM (atomic force microscope). The results show that the theoretical MTC tends to be minimal value then before the adhering effect to reach remarkable. Appropriate adjustments cutting parameters, the cutting process can always micro-cutting phase to reach the steady-thin chip, and no plowing phenomenon. So the surface residues highly were reduced and higher surface quality was achieved.
Design on the Electromechanical Shift Mechanism of AMT
Authors: Tao Jin Ling , Jin Hui , Yuan Wei Song , Chen Hui Yan
Published: September 2011

According to the performance characteristic of the shift system of AMT, the design requirements of electromechanical shift mechanism are developed, and the electromechanical shift mechanism of AMT for the off-road vehicle is designed. Based on the shift force and shift time, parameters of selection and shift operating mechanism are designed. The mechanism is analyzed by FEA software, affording theoretical principle for the structure improvement and its final design. The test result proves that the electromechanical shift mechanism is reasonable and feasible of the application of AMT system.
Improved Hilbert-Huang Transform Applied in Power Quality Detection in Ship Power System
Authors: Su Yu Xiang , Liu Guo Ping , Li Lin , Shen Xiao Qun
Published: September 2011

In this paper, Hilbert-Huang Transform (HHT) and its improved method is introduced for detection and analysis of power quality in ship power system for the first time. This method is applied in detecting surge current and voltage interruption etc. of the ship power grid. Beginning-ending time, time-frequency, time-amplitude of the disturbance signal can be obtained accurately with HHT method. Mode mixing occurs when using empirical mode decomposition (EMD) to analyze harmonics, and consequently, all single harmonic components cannot be effectively decomposed. The improved HHT method based on Fourier transform is used to solve the problem in this paper. Complicated Harmonic can be decomposed into single harmonic component, and time-amplitude and time -frequency of harmonics can be obtained accurately by the improved method. In MATLAB/Simulink platform, harmonic source model of ship power system is established. Simulation results show that the improved method has better performance in Harmonics analysis than wavelet packet analysis.
Numerical Simulation and Analysis of Coaxial Powder Feeding Flow during Laser Direct Deposition
Authors: Zhang Wei , Shi Shu Qin
Published: September 2011

Coaxial powder feeding with carrier gas is the key part of laser direct metal deposition (DMD) rapid prototyping system. The convergence of powder flow would greatly affect forming efficiency, precision and performance. Numerical calculation model of flow field was built and simulated in this paper. The results of simulation and analysis had shown that powder flow field was very complex. The flow process could be divided into two parts, converging process and dispersing process. The main influencing factors of convergence included powder feeding rate, carrier gas flow rate, and the distance from nozzle to molten pool. There was a convergent focus where utilization ratio of powder was maximum. So the distance from nozzle to molten pool must be adjusted to equal to convergent focus (1.5cm) during DMD.
An Effective Classification Procedure for Plastic Food Packaging Based on NIRS
Authors: Wang Jing Jing , Hou De Xin , Wu Bei Lei , Ye Shu Liang , Yang Heng
Published: September 2011

Near-infrared spectroscopy (NIRS) is a technique that shows many possibilities in the field of identifying chemicals and materials. Plastic food packaging is not excluded of this practical application. In the current recycling system, a plastic identification must be done to avoid the hidden danger caused by defective goods. In an attempt to develop an alternative plastic identification technology, four plastics are collected including Polypropylene (PP), Polyethylene (PE), Polyethylene Terephthalate (PET), and Polystyrene (PS), and a qualitative model with Factor Analysis method will be built. Performance of the model varies substantially if wave bands and multivariate data analysis techniques change. When the wavelength ranges from 4700 to 10000cm-1, plastic food packaging whose spectrum data are optimized by first derivative + vector normalization with 5 factors can be successfully identified, with which a classification error of less than 4% can be reached within the validation set of 100 spectrum. The results obtained indicate that the method proposed in this paper has a real potential for future plastic classification uses.
Software Development Based on Object-Oriented Design for Parachute Design and Performance Analysis
Authors: Yu Li , Cheng Han , Yin Zhu Wei
Published: September 2011

In this paper, a powerful, user-friendly parachute design and performance analysis software (PDPA) is introduced. This software provides researchers a convenient and efficient parachute design tool. The functions such as parachute structure design, material selection, performance analysis, calculation verification, view display, document output, can be achieved. PDPA can be used for all types parachute design (flat circular parachute, ring-sail parachute, etc.) except parafoil, and combine the first stage parachute with main parachute to make up of a parachutes system. As a result, six types of performance plots, two structure figures, and three types of documents can be obtained. These remarkable features make the software more practical.
Simulation of the New Dynamic Combined Separator
Authors: Fang Y. , Wu J. , Li Z.
Published: September 2011

In this study,a new dynamic separator was designed by the simulation method with the ANSYS CFX11.0 software. It can be found that the flow field was separated into two parts in the rotor region, i.e. the fluid close to the rotor region went up through the rotor grading face, while the fluid in the distant area revolved around the axle forced by the rotor. The results of particle tracking showed that the particles smaller than 60μm can easily go through the rotor region, but the particles bigger than 100μm can hardly go through it.
Simulation of Temperature Field of Metal Thin Wall Parts during Laser Direct Deposition Rapid Prototyping
Authors: Zhang Wei , Shi Shu Qin
Published: September 2011

The simulation of temperature field during laser direct metal deposition(DMD) were researched. The finite element model of single track cladding, multi-track overlapping and multi-layer deposition were established. The temperature field was simulated by ANSYS software basing on life-and-death element and cycle algorithm. Under different process parameters, the temperature and temperature gradient on the cross-section of sample were simulated during single- track scanning, multi-track overlapping and multi-layer deposition. Temperature cycle curves at different position were analyzed and were consistent with actually value. Both simulation and experiment showed that heat accumulation during continuous forming greatly affected the temperature of molten pool.
Design of Acoustical System of Cellphone Screen Abrasive Shock Machining
Authors: Zhang Yun Dian , Teng Zhi Jun , Ji Hua Wei
Published: September 2011

The abrasive shock machining is used to machine cellphone screen. Acoustical system of machining apparatus is analysed in theory, conical transformer and tool with large dimension rectangular section are designed. And tool is analysed with the finite element analysis software, as well as the transformer connected with the tool. The results of analysis show that designed acoustical system is satisfied with designing and operating requirement and can also improve processing quality.
Investigation on Supersmooth Surface Machining with Stable Eccentric Immersed Polishing
Authors: Wang Zhao Jun , Liang Ren He
Published: September 2011

In this paper stable eccentric immersed polishing is investigated according to Preston equation. The polishing trace, speed, density of polishing fluid etc were analyzed in detail. The polishing practicability of the technology was verified for polishing a piece of zerodur and the supersmooth surface with the flatness of PV0.04μm was obtained. The roughness of the surface has decreased to Ra0.37nm from initial Ra1.5nm after polishing 120 minutes.
Patch Reconstruction with T-Splines Iterated Fitting for Mesh Surface
Authors: Zhao Xiang Jun , Lu Mei , Zhang Hong Xin
Published: September 2011

A coupling method of surface patch reconstruction based on T-splines is presented. The iteration T-splines reconstruction method is employed in general patching, and the iterative T-NURCCs is employed at singular points. Despite the differences of optimization strategies, they are all represented in T-splines, whose data structures and evaluation procedures are identical. The method is adapted to reconstruct complex models.
Study on Adsorption Properties of Fe3+ by Modified Hunan Black Tea
Authors: Song Juan Juan , Tu Li
Published: September 2011

The present paper discussed the best initial concentration ,PH value and temperature and other factors on adsorption of Fe3+ ions by modified Hunan black tea,the results show that the dynamic adsorption model of modified black tea on Fe3+ ions was well aecorded with quasi-second dynamic equation.The activation energy (Ea) was small.
Study on the Section's Extreme Position of Roadheader's Cutting Arm in Coal Mine Laneway
Authors: Mu Jing , Du Yi Bo , Li Rui , Tian Jie , Wu Miao
Published: September 2011

Directional excavation technology in the coal mine laneway is the important research direction of integrated excavation project. This paper studies the changes of cutting section shape and boundary values caused by the swing of boom-type roadheader's cutting arm ​​to calculate the maximum values of compensable pose deviation when cutting, as the research basis for the accuracy analysis of boom-type roadheader's directional excavation. This paper gives the calculation method of cutting arm control, spatial modeling and analysis of cutting head position changes caused by cutting arm in thought of the three-dimensional analytic geometry, and also gives verification in the way of Matlab graphics simulation. At last, a control method to compensate section boundary by cutting arm is put forward.
Harm and Trapping Strategy Research on Tiny Dusts PM2.5
Authors: Wang Cheng Fu , Shi Xiao Dong
Published: September 2011

The fine dust PM2.5 can suspend in the air for a long period, penetrate human body's defense system, and deposit directly into the alveoli, where does harm to health. Because of the serious pollution and the trapping difficulty of ordinary dust removal technologies, PM2.5 has become the focus of international air pollution control. To effectively capture PM2.5, detailed analysis of the creation of PM2.5 have been done, and different trapping strategies specific to different creation sources have been posed in this paper. Low collection efficiency of PM2.5 can be expected to be solved by the electrostatic precipitator, which applies the charging and coagulation for fine dust, penetrating-type electric field, high frequency DC power supply, combined with reduced voltage optimization of the rapping mode, etc.
Computational Analysis of Natural Gas Delivery Discrepancy
Authors: Seleznev Vadim , Kiselev Vladimir , Pryalov Sergey
Published: September 2011

The article describes algorithm for optimization of discrepancies in natural gas supply to consumers. Numerical monitoring makes it possible to obtain computational estimates of actual gas deliveries over given time spans and to estimate their difference from corresponding values reported by gas consumers. Mathematical analysis of the discrepancy is based on a statement and numerical solution of identification problem of a physically proved gas dynamics mode of natural gas transmission through specified gas distribution networks. The identified mode parameters should have a minimum discrepancy with field measurements of gas transport at specified reference points of the simulated pipeline network.
Contourlet Transform Based Texture Analysis for Smoke and Fog Classification
Authors: Zhao Yang , Zhao Jian Hui , Huang Jing , Han Shi Zhong , Long Cheng Jiang , Yuan Zhi Yong , Zhang Deng Yi
Published: September 2011

Fire detection has long been an important research topic in image processing and pattern recognition, while smoke is a vital indication of fire’s existence. However, current smoke detection algorithms are far from meeting the requirements of practical applications. One major reason is that the existing methods can not distinguish smoke from fog because their colors and shapes are both very similar. This paper proposes a novel texture analysis based algorithm which has the ability to classify smoke and fog more efficiently. First the texture images are decomposed using Contourlet Transform (CT), and then we extract the feature vector from Contourlet coefficients, finally we make use of Support Vector Machine (SVM) to classify the textures. Experiments are performed on the sample images of smoke and fog taking accuracy rate of classification as evaluation criterion, and the accuracy rate of our algorithm is 97%. To illustrate its performance, our method has also been compared with the algorithms using Gray Level Co-occurrence Matrixes (GLCM), Local Binary Pattern (LBP) and Wavelet Transform (WT).
Study on Wind Turbine Blade Design Method and Modeling Technology
Authors: Tang Wen Xian , Cheng Cheng , Cai Yun Di , Wang Fei
Published: September 2011

According to the design procedure of wind turbine blade, a design method that can make CAD software joint used was brought up. Wilson method was used to design and calculate the main data of blade. On this basis, the three-dimensional solid model of wind turbine blade could get by using and playing the function of different CAD software. This study provided a reference for the design of wind turbine blade and other similar complicated structures, which settles the basis for the further analysis of blade.
Integration and Conversion of 3D Models from 3DS to OpenFlight
Authors: Luo Yuan , Ren Ai Zhu
Published: September 2011

OpenFlight is one of the standard formats in Virtual Reality applications. But it only provides crude 3D modeling. Therefore most of the users prefer to build up 3D models in 3DS Max software, while the models created in 3DS MAX could not be used directly in a virtual reality environment. This paper proposed a solution for format conversion between 3DS Max and OpenFlight. Among others it focused on combining triangle meshes in 3DS format into entire faces. A program followed the method proved its availability. The application of this program in a transportation safety education system showed that it has good effects.
Simulation Supersonic Steam Flow in a Converging–Diverging Nozzle Using Different State Equations
Authors: Zhou Li Bo , Zhou Ming Hui
Published: September 2011

In order to learn the difference and accuracy of state equations in supersonic steam flow, a classic converging–diverging nozzle flow field was simulated using CFD method. Compared to experiment value, the results shows that IF97 real gas model agrees well, and several parameters were discussed. This paper will providing fundamental basis for SE choosing in supersonic steam simulation field.
A Study on Analysis and Improved Methods for Noise and Vibration of Compressor Motor
Authors: Qian Xiao Yao , Wang Ping Ping
Published: September 2011

Motor noise and vibration reflect quality control problems for the motor production process,finding out the cause through testing and analyzing the spectrum of motor noise and vibration to educe the main noise sources, thus guiding to improve motor production quality. In this paper by means of noise and vibration measurements, meanwhile carry out statistical and analysis for the measured data to find the influence size of various factors with quality analysis tool, and then adopt some corresponding measures to control the motor noise, hoping to improve the motor quality.
Design and Analysis of an Omni-Directional Mobile Robot with Orthogonal Wheel
Authors: Zhou Wei Hua , Guo Ji Feng , Jia Guan Shuai , Liu Han
Published: September 2011

This study presents the processes undertaken in the design and implementation of an omni-directional mobile robot using orthogonal wheels. The orthogonal wheel developed consists of ten rollers, achieves not only forward, reverse, left slide, right slide, but also rotation in situ. The mobile robot consists of four orthogonal wheels which independently powered by brushless DC motors. A DC industrial motherboard is adopted in the main controller, which constitutes a NMT network with the communication ports of four motor drivers by an extended CAN card. In the NMT network, the host computer is the CAN node master, and each motor driver is the CAN node slave. The host computer controls each motor’s movement, and reads the motor’s current, position and speed information through the NMT network in real-time. The experiment shows that the mobile robot can achieve omni-directional movement.
Regularization Method for System Error Estimation Based on One Measurement Element
Authors: Wang Fang , Xie Mei Hua
Published: September 2011

Error exists in almost every measurement, which often affects the application of measurement. In traditional method, system error is estimated by combine several measurements, but in some cases, we can get only one measurement and should estimate the system error of this measurement. This paper studies the estimation of high frequency system error of one measurement element. In this method, we assume the frequency of signal is lower than the frequency of system error. Under this assumption, we can constrain the derivative of the signal to be small because of its low frequency, and this we help us to establish a model to separate system error with high frequency from signal. According to this thought, this paper gives a regularization model for system error estimation based on signal smoothness constraint. Simulated results demonstrated the efficiency of new method.
Finite Element Analysis of Vibratory Stress Relief Process
Authors: Zhao X.C. , Zhang Y.D. , Ma Y.J.
Published: September 2011

The process of stress vibratory relief is gaining more and more weight as manufacturing process. This is mainly due to the fact that vibratory stress relief has the advantage of low energy consumption and dramatic reduction of pollution to the environment in respect to traditional thermal stress relief process. A finite element model is developed for the simulation of vibration stress relief (VSR) process. A cantilever beam was pre-stressed and then subjected to transverse cyclic force to see the effect of vibration frequency, time and amplitude on the reduction of residual stress. It was shown that the excitation frequency and amplitude of the load on the beam had great effect on the reduction of the residual stress. Increasing vibration time can decrease the magnitude of residual stress, but its influence reduces greatly after several cycles.
The Preliminary Research on Health Management of Stratospheric Airship
Authors: Huang M. , Xia Z.X. , Zeng Q.H.
Published: September 2011

The stratospheric airship, with long-endurance and quasi-static capability, is suitable to carry out special mission such as communications relay, hot spots monitoring, etc. In order to improve the safety performance of the stratospheric airship and keep the robustness of mission, health management (HM) system is introduced, the foundation of which is the logic architecture. Based on the analysis of three options about the logic architecture used in spacecraft, hierarchical fusion architecture is selected, the functional modules in which are designed in detail. To solve urgent faults, moreover, the autonomous intelligent control system (AICS) is introduced. Meanwhile, monitoring mission is taken as an example to discuss the mission health management strategy based on laser communication.
Research on Bending Fatigue of Cylindrical Gear Based on ANSYS Workbench
Authors: Li Xue Yi , Li San Shuai , Jiang Shou Bo , Zhong Pei Si
Published: September 2011

Based on the bending fatigue properties of cylindrical gear pair, the worst meshing positions on driving and driven gears are respectively determined, the corresponding S-N curve for bending fatigue and loading spectrum of tooth root bending stress are obtained. Then a method for analyzing the bending fatigue of the cylindrical gear by ANSYS Workbench is studied and the simulation is carried out. Different from the traditional methods, the bending fatigue characteristic parameters such as safety coefficients and fatigue sensitive coefficients for every part of the tooth can be precisely calculated by finite element method. It provides an important basis for reliability design and structural optimization of the cylindrical gear pair.
Paraboloid of Revolution Part Hydromechanical Deep Drawing and Finite Element Simulation of Stress Analysis
Authors: Chang Yong , Li Xiang Sheng , Du Rui Li
Published: September 2011

Theory of Elasticity and Plasticity was used to analyzed stress of different deformation zone of part in hydromechanical deep drawing (HDD). HDD is a kind of advanced sheet metal forming method. Satisfying the need of adornment parts and auto parts and aiming at paraboloid chimney HDD with initial inverse pressure and variable blank-holder forces was studied by means of numerical simulation. The dynamic explicit analytical software DYNAFORM was employed to simulate the forming process to obtain major principal stress of the material. The blank holder force and hydraulic pressure influence on forming were studied. The load curve of blank holder force (BHF) and hydraulic pressure were optimized.
Modeling of Bridge Collapse in Virtual Scene Based on Finite Element Simulation
Authors: Xu Zhen , Ren Ai Zhu , Lu Xin Zheng
Published: September 2011

To simulate bridge collapse realistically and assist the investigation of bridge collapse accidents, a modeling method of bridge collapse in Open Scene Graph (OSG) graph engine based on Finite element (FE) simulation is proposed. For FE simulation using 3D solid elements, the main questions of modeling, such as scene hierarchy, drawing method and texture mapping, are discussed. A study case shows the bridge model in this paper is with realistic graphics, render efficiency and simulation controllability. The 3D virtual scene simulation using the modeling method proposed in this paper has the same accuracy as FE simulation, but is more realistic and complete than FE simulation and provides a graphic support for the analysis of bridge collapse accidents.
Extending FMCS Test for Flight Simulation
Authors: Li Zhao Hui , Li Gang
Published: September 2011

By means of a simulator we could expand the test research scope which could not be reached with flight tests, and recover and repeat some special domain of the test course, and make many kinds of experiments about FMCS properties, functions and with embedded failures by combining simulation tests with practical structure. The reliability and creditability of simulation results could be increased under real FMCS in conjunction with semi-entity simulation. Simulators combining a real FMCS with digital simulation have been used extensively for evaluating the large matrix of FMCS contents.
Research on Product Modeling Method for Supporting the Networked Manufacturing
Authors: Mao Guo Hong , Pan Jian , Lin Lan Fen
Published: September 2011

This paper introduces a new product modeling method: MAPMNM(Multi-Agent Based Product Modeling for Networked Manufacturing) based on analysing the requirements of product modeling. The method offers a unified product master model and distributed domain models to alliance enterprise based on network by using web service and the agent technology of AI domain. Firstly, the paper gives the framework of the MAPMNM.Secondly, it elaborates on the web services, the architecture and running menchanism of the domain agent in MAPMNM.
Effects of Circular Groove Angle on Static Characteristics of Journal Bearing Using CFD Method
Authors: Liu Hean
Published: September 2011

This document calculates and discusses circular groove angle (CGA) affects on journal bearing performance. CFD method has been used for calculate N-S equations and cavitation effect has been considered. The results show that as CGA increases, the maximum pressure is decreased, the capacity and friction moment are also decreased. The maximum pressure position is increased from 1 to 2 when CGA is 180°. This paper will provide a theoretical basis for journal bearing groove optimal design.
Adaptive Control of Uncertain Gun Control System of Tank
Authors: Shen Lu Juan , Bao Ye , Cai Jian Ping
Published: September 2011

In this paper, a class of gun control system of tank is considered with uncertain parameters and the backlash-like hysteresis which modeled by a differential equation. An adaptive control law is designed with backstepping technique. Compared to exist results on tank gun control problem , in our control scheme, the effect of backlash hysteresis is considered completely than to be linearized simply and no knowledge is assumed on the uncertain parameters. the stability of closed loop system and the tracking performance can be guaranteed by this control law. Simulation studies show that this controller is effective.