bluuebunny/crossref_metadata_2025 huggingface dataset:
Proposal of a Masticatory Robot for Analysis of Jaw Movements
Authors: Cong Ming , Liu Tong Zhan , Wen Hai Ying , Chang Zhan Bo
Published: November 2011

In this paper, a life-sized jaw mechanism is proposed on the basis of biological masticatory structure. Its actual parameters are defined in Solidworks according to human masticatory systems, the trajectory and position error of masticatory robot is performed via ADAMS and Matlab. The simulation results have shown that the robotic jaw is able to reproduce the human behavior. However, because the mechanism is a highly coupled and nonlinear system, the position error cannot be eliminated completely, and more sophisticated control system is required in future study.
Effects of Torsional Stiffness and Preload on a Hopping Robot with Two-Segment Legs
Authors: Shin Dong Hwan , An Ji Nung
Published: November 2011

In this study, we present the effects of design parameters on the performance of a hopping robot. In particular, we focus on the effects of torsional stiffness and preload on a hopping model with two-segment legs having passive knee joints with torsional stiffness. One of the objectives for a field robot is the ability to travel quickly with energy efficiency [1]. Therefore, it is important to determine what range of each design variable is proper to realize not only the high forward speed for great mobility, but also the low torque consumption for energy efficiency. Accordingly, we describe both the analogy simulation of a hopping gait with two-segment legs and the results of this simulation.
Application Research on Elastomer Damper in Tracked Vehicle Suspension System
Authors: Xu Zhong Si , Su Tie Xiong , Li Gang , Wang Kai
Published: November 2011

Because traditional passive suspension system can’t meet with the requirement of ride in all kinds of roads, elastomer damper was designed and installed on the limiting stopper of the suspension system. Two degrees of freedom model of suspension system with elastomer damper was built and its dynamics simulation was done by use of the software Recurdyn. The simulation results show that the application of elastomer damper can improve the ride of tracked vehicle; the striking force apparently decreases when suspension system has broken down and the probability of suspension system breakdown has been obviously reduced, all of which illustrates the elastomer damper has an obvious dampening effect on the tracked vehicle. Keywords: elastomer damper, tracked vehicle, suspension system, dynamics simulation
Optimization of Plate with Partial Constrained Layer Damping Treatment for Vibration and Noise Reduction
Authors: Hou Shou Wu , Jiao Ying Hou , Wang Xin , Chen Zhao Bo , Fan Yong Bo
Published: November 2011

To efficiently reduce vibration and noise of a plate, an optimization of passive constrained layer damping (CLD) is presented. The dynamic equation of a sandwich plate with CLD treatment is derived using Lagrange’s method. The assumed modes method is employed to solve the equation and obtain the vibrational energy and sound power, which are used as the objective of optimal design. A genetic algorithm of big mutation is employed to search for the optimum of the location of CLD treatment, the thicknesses of both the constraining layer and the viscoelastic layer and the shear modulus of the viscoelastic material with the restriction of added mass of the total CLD treatment. Numerical results show that for a simply-supported plate with a transverse force (1Hz~200Hz) applied at (0.8La, 0.8Lb), the optimized CLD significantly reduce the vibrational energy and sound power.
A Finite Element Model to Evaluate Airport Flexible Pavements Response under Impact
Authors: Buonsanti Michele , Leonardi Giovanni
Published: November 2011

This paper using finite elements (FE) an approach to determine the contact stresses in a flexible pavement under landing aircraft loads is presented. The proposed 3-Dimensional model simulates the behaviour of flexible runway pavements during the landing phase. A study on the impact of a rubber solid on the free surface of a granular plate is presented, simulating an aircraft gear system landing on with a flexible surface. This study is performed considering two tires on the structural pavement, with the real loads applied directly on the two wheels of the gear system. The application takes in account the frictional phenomena developed between rubber solid and the surface of the pavement during the lockwire.
The Study on the Mechanical Property of the Top-Seat-Angle with Double Web-Angle Connection
Authors: Yang Wei Jun , Yang Yong Da , Tian Jun Jie
Published: November 2011

This thesis investigated the mechanical property of the semi-rigid steel beam-column connection and its influence upon the propery of the framework; grounded on several foreign common mathematical models on the moment-rotation relationship of semi-rigid connection, and on the basis of exponent function model, it derived the ultimate bearing capacity (Mμ) and initial connection stiffness (Rki) which act as controlling function in the formula. Also, it imitated the typical connection of top-seat-angle with double web-angle, ensured its moment-rotation curve, and provided a reference for the analysis of the ultimate bearing capacity in the second-order effect of light steel frame structure.
Reliability Analysis on the Key Components of High-Power Low-Speed Diesel Engine
Authors: Chen Guo Jin , Liu Zhong Min , Liu Ting Ting , Su Shao Hui , Yuan Guang Jie , Cao Yi Jiang
Published: November 2011

In this paper, taking the high-power low-speed diesel engine as a study object, aiming at the key components' reliability analysis, a series of methods is proposed based on the finite element analysis. That is, the strength and fatigue analysis of the engine's body, the bending and torsion fatigue analysis of the crankshaft, the thermal fatigue and mechanical fatigue analysis of the cylinder head-piston, the wear analysis of the valve-seat, the structural-thermal coupling analysis and the other methods. The dynamics test system of the valve gear is built to provide the technical preparation for optimizing the diesel engine's structure.
Principal-Component Calculation of Stray Light for Infrared Detection
Authors: Niu Jin Xing , Li Heng Can
Published: November 2011

Analysis and calculation of stray light is important to improve the performance of infrared detection system. In this article, we mainly discussed two sources: earth and atmosphere emission and thermal stray radiation. A method based on Monte Carlo ray-tracing in TracePro is proposed to calculate the irradiance of detector arisen from earth and atmosphere emission. The thermal stray light irradiance on detector can also be obtained by simulation in TracePro.
Setting the Model of Iced High-Voltage Transmission Tower-Line System and Research its Dynamic Characteristics
Authors: Liu Yue Jun , Tang Ai Ping
Published: November 2011

As an important lifeline, regelation have a lot of serious effects to the transmission towers and transmission lines. China has been serious affected by the macroclimate, microtopography and microclimate condition, many accidents caused by ice cover occured frequently, it seriously impacted on people’s life and the development of social economy. In order to strengthen and improve the anti-icing capability of transmission tower-line system, it is necessary to study the iced transmission tower-line system. In this paper, the wire model, ground wire model and insulator model were established, and made a reasonable layout at the same time, then the coupled model of the transmission tower-line system is set up. It is supposed that the ice and transmission line are combined closely when there is no external loads, the ice is considered as circular cross-section, the composite structure of ice-transmission line is set up, then the coupled model of the composite structure-tower is set up, the dynamic characteristics of model can be obtained by the model analysis used the finite element analysis software SAP2000.
Mechanical Analysis of Filter Cylinder of Containment Sump Strainer
Authors: Lu Guang Yao , Ren Jun Sheng
Published: November 2011

In this paper, the double filter cylinder of the compact containment sump strainer innuclear power station was adopted as the research object. The impact and transmission mechanicalexperiments were carried out to investigate the material and structural properties in the event ofearthquake and LOCA (Loss-of-Coolant Accident). Furthermore, the modal analysis and the stresscalculations were conducted in LOCA condition to test the validity of the filter cylinder. The researchresults could provide the basis for designing the double filter cylinder of the compact containmentsump strainers.
Study on Rollover Security Based on the Bus Middle Body Frame
Authors: Lu Yong , Jiang Kai Yong , Zhou Fang Ming , Wu Chang Feng
Published: November 2011

Based on the middle body frame of a Half-integral bus which a bus manufacturer mainly produces in China, this paper discusses analyses and improvements for rollover security of the bus middle body frame with TRIZ methodology and TRIZ tools. On the basis of forming mechanism of bus rollover, a breakthrough point has been found from cause and effect relationship and function achievements aspect; some customized measures are therefore proposed. It focuses on the stiffness design of side pillars and the strength enhancement of soldering joints. Applying CAE analysis based on Ls-dyna, the results show that the deformation and deformation mode of the bus middle body frame have been greatly improved during bus rollover, which fulfills the requirements of the force of ECE R66 Rollover Security Regulations and validates the correctness of suggested measures.
The Investigation of Temperature Effect on Dynamic Characteristics of Rubber Isolator
Authors: Han De Bao
Published: November 2011

This article focuses on the temperature dependent dynamic properties of rubber isolator. First, a set of experimental device was designed to conduct the experimental investigation. Then, a polynomial model of hysteretic used as an isolator restoring force model was proposed and the model parameters were identified using the displacement-restoring force loop from experiment by the optimal least-squares arithmetic. Finally, the Hermite interpolation method was utilized to add the number of identified parameters, such that curvatures that represent the first order stiffness, the third order stiffness and damping varied with frequency, amplitude under different temperature were obtained. The analysis results indicated that the first order stiffness varies weakly with the temperature increasing, and there is an area of the first order stiffness varied drastically. The third order stiffness have a strong nonlinear area within the low frequency and little amplitude, the third order stiffness magnitude increases with the temperature increasing firstly, then decreases while the temperature over 50°C. There is a sensitive area as the amplitude less than 1.5mm, the damping decreases rapidly with the augmenting of vibration amplitude, and the rate of decreasing is less gradually with the temperature rising.
Preparation and Characteristic Measurement of Born Doped Diamond Film Electrode on Tantalum Substrate and its Properties for Degradation of High COD Wastewater
Authors: Gao Cheng Yao
Published: November 2011

The boron-doped diamond film electrode grown on tantalum substrate (BDD/Ta) was prepared by hot filament chemical vapor deposition (HFCVD) technique. The morphology and quality of BDD/Ta film electrode were investigated by SEM and Raman spectroscopy respectively. The electrochemical behavior of the BDD/Ta film electrodes in Na2SO4 solution was also investigated by cyclic voltammetry and the window potential of BDD/Ta film electrode in Na2SO4 solution is of 4.1V, the hydrogen and oxygen evolution potentials are of-1.8V and +2.3V respectively. The characteristic measurements of BDD/Ta film electrode and its application to degradation of high concentration organic wastewater indicated that BDD/Ta film electrode have a series of advantages, including high overpotential for oxygen revolution, high current efficiency, good removal of chemical oxygen demand (COD).
Damage Tolerance Properties of 2198-T8 Integral Fuselage Panel between Double Friction Stir Weld Joints
Authors: Ma Yu E , Liu Bao Qi , Zhao Zhen Qiang
Published: November 2011

Al-Li alloy 2198-T8 was used in the fuselage application. Integral fuselage panels were joined by double friction stir welds. Fatigue tests were conducted in the R=0.1. Notch was made between two welds. Residual stresses were measured and analyzed in the test samples with double welds. Cracks grew from the centre of two welds and across the two welds were observed, and crack growth rates were measured and compared with parent material. It is shown that crack growth rates are lower between double welds, and it is close to parent material after cross the two welds. The virtual crack closure technique (VCCT) method was used to calculate stress intensity factor from residual stress (Kres) in aim to explain the experimental findings.
Fourier Cosine Differential Quadrature Method for Beam and Plate Problems
Authors: Shao Wen Ting , Wu Xiong Hua
Published: November 2011

In this paper, we combined the Fourier cosine series and differential quadrature method (DQM) in barycentric form to develop a new method (FCDQM), which is applied to the 1D fourth order beam problem and the 2D thin isotropic plate problems. Furthermore, we solved the complex boundary conditions on irregular domains with DQM directly. The numerical results illustrate the stability, validity and good accuracy of the method in treating this class of engineering problems.
Application of Finite Element Method in Submarine Cable Fiber Excess Length Analysis
Authors: Huang Huan , Dong Xiu Chun
Published: November 2011

In this paper, finite element method is compared with analytic method in the analysis of submarine cable fiber excess length. And the limitations of using analytic method are analyzed. Then the feasibility and advantages of using finite element method is discussed. We can control and design fiber excess length more reasonably and produce cables in a more scientific way by using finite element method in the analysis of submarine cable fiber excess length.
The Analyses for Natural Frequency of Laminated Plate Using an Improved Higher-Order Theory
Authors: Wu Jin Wu , Huang Ling Zhi
Published: November 2011

An improved higher order method was used in calculating the natural frequency of laminated composite plate. The function of equation of free vibration of laminated plate was established using Hamilton's principle and calculated the natural frequencies of plates. The influence of the laying-angle and thickness ratio and cross-elastic modulus ratio to the frequency of the plate were analyzed. It is shown that the natural frequency of antisymmetric angle-ply laminated plates and antisymmetric cross-ply laminated plate can be calculated by using this paper theory; in addition, it is feasible to calculate the natural frequency of the random form of laying laminate.
Tensile Behavior Prediction of Steel Plates with Pitting Corrosion
Authors: Chun Pang Jo , Yoshii Daichi , Appuhamy J.M.R.S. , Ohga Mitao
Published: November 2011

We report the tensile behavior of corroded steel plates with huge corrosion pit. The behavior of corroded steel plates is not easy to predict because of its surface roughness. We therefore conducted tensile tests first to understand the behavior experimentally using the corroded steel plates taken from plate girder bridge. Before the testing, a 3D laser prove system was employed to measure the surface irregularity. In addition, finite element model was developed here to predict the behavior numerically. The model was validated by the tensile test results so that the finite element model can be reliably used for the parametric study. It is found from the parametric study that the location of huge corrosion pit affects the tensile strength, at most 15%.
Research on Mesh Generation Effecting Resistance Calculation
Authors: Deng Rui , Huang De Bo , Zhou Guang Li , Sun Hua Wei , Chang Liang , Ma Chao
Published: November 2011

In order to give consistent and agreeable results in resistance and other hydrodynamic performance with some of the viscous Computational Fluid Dynamics methods which appear to have difficulties when applied to hulls, the investigation of the influential factors like mesh generation which affect the calculation results are taken by the simulation of different cases in the present paper. Through calculation and analysis, specifically with the CFD code FLUENT, an alternative set of computation parameters of mesh generation for engineering application is suggested. The application of the suggestion to the hull researched in this paper result in better agreements with corresponding model tests.
Comparison of Resonance Characteristics for Two Metal Nano-Optical Antennas
Authors: Yuan Zong Heng , Zhu Dong Dong , Wang Hong Ru
Published: November 2011

In this paper dipole type optical antenna and V type optical antenna are designed using gold and glass substrates, we compared their resonance properties by finite-difference time-domain (FDTD) method, calculated and analyzed their distribution and field enhancement effects contrastively. The results showed that in the same projected length, the resonant frequency of dipole type optical antenna was higher than the V type optical antenna, while the resonance enhancement factor was lower than the V type optical antenna. These have certain reference significance for researching characteristics of nanoantenna based on surface plasma.
Analysis of Soluble Fraction with Carbon Disulfide/tetrahydrofuran of Erdos Coal by FTIR and GC/MS
Authors: Zong Ying , Sun Yuan Bao , Zhao Yuan Li , Wei Xian Yong
Published: November 2011

A subbitumious coal from Erdos, Inner Mongolia, China, was extracted with isometric carbon disulfide/tetrahydrofuran (CS2/THF) mixed solvent. The components and structure features of CS2/THF soluble factions were analyzed by FTIR and GC/MS. The results show that the total extract yield was 6.6% after five extractions with fresh mixed solvent. And the mass fraction of the first extract was biggest which the 68% amount of the total extracts was. The FTIR spectra of the extracts had abundance functional group information, which can fully indicate that the extracts contain aliphatic compounds, aromatic compounds and heteroatom-containing compounds. Only the first extract can be detected by GC/MS among the five extracts and seven compounds were detected by GC/MS clearly and they are aromatic compounds, in which the three larger relative abundance compounds are retene, 7-butyl-1-hexylnaphthalene and 7-isopropyl-1,1-dimethyl-1,2,3,4-tetrahydro- phenanthrene.
Development of a Temperature Sensing System for a Real-Time PCR Instrument
Authors: Zhang Xin Lei , Kong Jing Jing , Feng Ji Hong
Published: November 2011

In this paper, we design a temperature sensing system based on a DSP chip TMS320F2812 for a real-time PCR instrument. In this system, we design a 4-wire temperature sensing module with a thermal resistor PT100 to measure the temperature and convert it into a voltage signal. Then the voltage signal is digitalized by the ADC module. At last, the data are transferred to a PC through the serial port. The experimental results show that the linearity of the system is 0.99 with the standard deviation of 0.0419.
Development of Portable System for Assessment of Daytime Sleepiness
Authors: Liu Miao Fang , Luo Jia Ying , Luo Yuan Ming
Published: November 2011

Many studies have shown that sleepiness is a major cause of traffic accidents. Some occupations, such as airplane pilots and automobile drivers, are not suitable for patients with daytime sleepiness. Therefore, it is important to establish an objective assessment of datime sleepiness for screening commercial drivers or pilot and for diagnosis of obstructive sleep apnea. In this study we introduced a portable system and compared it with traditional polysomnography in evaluation of daytime sleepiness. Eight patients with OSA and eight normal subjects were studied. Sleep latency as judged by portable device was the same as that judged by conventional polysomnography and sleep latency measured from patients with OSA (18.12±9.14 minutes) was significantly shorter than that in normal subjects (> 40minutes) , p<0.01. In conclusion, portable device is as useful as conventional polysomnography in assessment of daytime sleepiness.
Treatment of Ventricular Tachycardia Storm
Authors: Lin Zhao Heng
Published: November 2011

OBJECTIVE: To investigate the clinical efficacy and safety of low-energy direct current defibrillation combined with intravenous application of β-receptor blocker in the treatment of ventricular tachycardia storm (VTS). METHODS: A total of 59 patients with VTS were randomly divided into two groups. In the control group (n = 31), intravenous administration of Lidocaine or Amiodarone and routine electrical defibrillation were performed. In the esmolol group (n = 28), intravenous administration of esmolol and low-energy electrical defibrillation were performed in addition to the same drug treatment as the control group.RESULTS: The success rate of terminating recurrent ventricular tachycardia or ventricular fibrillation was significantly higher in the esmolol group than in the control group (89.71% vs. 39.89%, P < 0.05). The necessary discharge times and average discharge energy to terminate ventricular tachycardia or ventricular fibrillation were significantly decreased in the esmolol group compared with control (5.69 ± 1.34 times vs. 8.63 ± 3.79 times, 95.32 ± 13.21J vs. 185.39 ± 25.63J, both P < 0.05). There was no significant difference in the incidence of hypotension (45.16% vs. 39.29%), sinus bradycardia (3.23% vs. 3.57%), and junctional/ventricular escape (38.71% vs. 39.29%) between the esmolol and control groups (all P > 0.05). The mortality was significantly lower in the esmolol group than in the control group (21.43%, 6/28 vs. 77.42%, 24/31, P < 0.01).CONCLUSION: Compared with conventional treatment, intravenous administration of a β-receptor blocker combined with low-energy electrical defibrillation could be a safe and effective therapy to treat VTS.
Effect of Aloin on the Soluble Sugars Metabolism and Flavor Quality Keeping of Gonggan
Authors: Liu Jian Liang , Chen Lu , Xu Shi Lun , Xu Pei Peng , Cui Ying De , Chen Paul L.
Published: November 2011

Gonggan（Citrus sinensis Osb. ‘Deqing Gonggan’）is a natural hybrid citrus from Guangdong province. To understand conflicting relationships between the change of flavor quality and total soluble solids and titratable acid contents of Gonggan fruits and study the method of flavor quality keeping at room temperature, we investigated that the flavor quality keeping role of aloin and its effects on soluble sugars contents, and acid invertase activity of Gonggan fruits. The results in this paper show that the change of flavor quality can be evaluated through soluble sugars（sucrose, glucose, fructose）contents, and also not through total soluble solids and titratable acid contents. Aloin reduced the changes of the inclusion contents of Gonggan fruits during storage, extended the flavor quality period from 7 to 15 days, changed the variation patterns of total soluble solids, soluble sugars（sucrose, glucose, fructose）contents and acid invertase activity from s-type of control into half-s-shaped. Its role in flavor quality keeping effect on fructose content change of Gonggan fruits is discussed.
Effect of Extraction Method on Functional Properties of Dietary Fibre from Auricularia auricula
Authors: Zhang Yong Jun , He Jie Min , Zhu Li Yun , Jin Hui , Li Jia
Published: November 2011

Extraction method by which auricularia auricula was treated affects the phytochemical composition and properties of the fibre-rich powders. Factor such as the solvent used was studied, and the significance of such changes was largely dependent on the alkali liquor. Among the auricularia auricula phytochemicals, crude protein, glucosamine, fat and carbohydrate were quantified. Crude protein ranged from 9.98% to 4.40%, and fat ranged from 2.51% to 3.71%, and carbohydrate ranged from 88.21% to91.66%, the content being affected by the solvent, in some cases. Dietary fibre (DF) from alkali liquor treatments had significantly higher amounts of glucosamine than samples extracted by water. The water-holding capacity (WHC), water retention capacity (WRC) and oil-binding capacity (OBC) of fibres from alkali liquor treatments were decreased by 51.4, 48.1, and-3.8%, respectively. The cation exchange capacities (CEC) was significantly lower from alkali liquor treatments, and CEC was only 0.02 meq/g fibres that decreased by 95.4%. The results showed that, in order to preserve the DF quality, the extraction solvent should be important. DF functional properties might be degraded or modified.
Effect of Postharvest Polyamines Treatment on Oleocellosis of Valencia Oranges
Authors: Liu Li Dan , Ming Jian , Zeng Kai Fang , Liao Chen
Published: November 2011

In order to learn effective methods for oleocellosis control, the induction of disease resistance and reactive oxygen species metabolism in valencia oranges by postahrvest polyamines treatment was investigated in this study. As showed in the result, polyamines and polyamine with hot water treatment had a significant effect on controlling oleocellosis during storage. Compared with control, MDA content in polyamine-treated fruit was rapidly decreased, but catalase and peroxidase activity had a sudden increase. Moreover, fruit in polyamines and polyamines with HWT treatment had a rapid increase in ASA-GSH anti-oxidation ability, and total phenols content in treated fruit also increased suddenly before 9 d, then followed by a sudden decline. Fruit in polyamines and polyamine with HWT treatment had a lower polyphenoloxidase (PPO) activity. Thus, polyamines may enhance antioxidation of citrus peel to improve disease resistance and decrease PPO activity to produce little rind spot during storage.
Evaluation of Effects of Adding Different Resistant Starches on Firmness and Stickiness of Dough by NMR during Proofing
Authors: Zhang Jin Sheng , Peng Hong , Lin Xiang Yang , Liu Yu Huan , Jin Zhi Qiang
Published: November 2011

Low field nuclear magnetic resonance (NMR) was used to study the effect of different contents and types of resistant starch (RS) on dough quality. Inverse recovery (IR) sequence was used to acquire the sample’s NMR relaxation data during dough proofing. Firmness and stickiness were measured by a Texture Analyzer. An increasing trend of firmness and stickiness was observed as the content of resistant starch was increased in the dough. Data showed the appropriate RS content of adding was 5%(g/g). From magnetic resonance image (MRI), the moisture migration and distribution were quite uniform after 1~2h proofing during proofing process. This study showed the advantage of NMR technology, and this method could be used for the development of dough-based products containing RS in food industry.
Loop-Mediated Isothermal Amplification Method for Rapid Detection of Shigella dysenteriae
Authors: Zhong Qing Ping , Wang Li , Wang Bin , Chen Hong Yuan
Published: November 2011

The study was aimed to develop a loop-mediated isothermal amplification (LAMP) method which amplifies DNA with high specificity and rapidity for the detection of Shigella dysenteriae. A set of four primers was designed for recognizing six distinct sequences on the target ipaH of S. dysenteriae. By the method, the target DNA was amplified within 1h under isothermal condition at 65 °C. The sensitivities of the LAMP for detecting pure culture and genomic DNA were 1.04 CFU/ml and 1.06 fg/μl, while the sensitivities of PCR method were 1.04×102 CFU/ml and 1.06 pg/μl. Furthermore, the LAMP assay was examined for its ability to detect S. dysenteriae in artificially contaminated lettuce sample, the detection limits of this LAMP assay and the PCR method were 4.60 CFU/g and 4.60×102 CFU/g, respectively.
Research on Blanching Pretreatment of Quick Frozen Sword Bean (Canavalia gladiate)
Authors: Zhou Chen Wei , Xu Juan , Li Qing Qing , Wang Rui Zhi , Yang Lu , Du Shan Shan , Ruan Hui , He Guo Qing
Published: November 2011

Quick frozen could preserve the maximum micro-texture and taste quality of vegetables, and blanching pretreatment is primary determinant of quick frozen. In this study, the central composite experimental design and response surface methodology were adopted to derive a statistical model for the effect of blanching pretreatment on the quality of sword bean (Canavalia gladiate), with peroxidase activity as main index. The pretreatment process optimized with response surface methodology was blanching at 96 °C for 1.03 min. Through optimization, a statistical model was established for the relation between blanching temperature, time and peroxidase activity, which would facilitate the prediction of the effects of blanching on the quality of sword bean and could play a guidance role in the blanching pretreatment of many other vegetables.
Therapeutic Effect of Attenuated Salmonella Carrying SiRNA-STAT3 Plasmid on Transplanted Prostate Cancer in Mice
Authors: Cong Zhong Yi , Zhou Yue , Zhou Shu Han , Zhao Xue Jian , Zhou Qing Wei
Published: November 2011

Objective To observe the therapeutic effect of attenuated Salmonella carrying siRNA-STAT3 plasmid on transplanted prostate cancer in mice, and investigate the mechanism of siRNA-STAT3 inducing apoptosis of prostate cancer cells in mice. Methods The transplanted prostate cancer models of mice were built, and then the mice were randomly divided into Mock group, pGC-Si-Scramble group and pGC-Si-STAT3 group. The general status of the mice was observed and the changes of tumor volume were recorded. The expression levels of mRNA and protein of STAT3 and its downstream genes such as Bcl-2, c-Myc, HIF-1, cyclinD1 were analyzed with RT-PCR and western blotting, and the apoptosis of tumor cells was detected with flow cytometry. Results Compared with the Mock group, the tumor weight and tumor volume in pGC-Si-STAT3 group were significantly decreased (P<0.05). The result of flow cytometry revealed that the early apoptotic rate of tumor cells in pGC-Si-STAT3 group was (29.1±1.6)%, which was significantly higher than that of pGC-Si-Scramble group (14.7±1.4)% and Mock group (8.9±1.8)% (P<0.05). The mRNA expression levels of STAT3 and its downstream genes Bcl-2 and c-Myc in the pGC-Si-STAT3 group were significantly decreased (P<0.05), and the protein expression levels of STAT3 and its downstream genes HIF-1 and cyclinD1 were also decreased (P<0.05), compared with the Mock group. Conclusion The attenuated Salmonella carrying siRNA-STAT3 plasmid could inhibit the growth of transplanted prostate cancer in mice by regulating the expressions of STAT3’s downstream genes and inducing the apoptosis of tumor cells.
Design of Distributed Wireless Monitoring System to Photovoltaic Modules Based on CC2530
Authors: Xu Bao Jie , Wang Mao
Published: November 2011

Effective monitoring of photovoltaic system can make the operation condition of the system easy to know, and can also provide powerful data support for the further research. General monitoring method is to confirm the state of photovoltaic system by monitor the inverter unit’s some parameters relevant. This paper focuses on the monitoring of PV module, in order to get more accurate data, and then improve the efficiency of the PV system. Achieve the purpose of monitoring by the wireless sensor network constructed by sensor nodes that is designed proper for the acquisition of solar modules’ parameters data relevant, the monitoring application software also has been completed. The results indicate that the monitoring system who achieves the design requirements and expectations well, also with the characteristics of cost saving and convenient to set up has promising prospects.
The Finite Element Analysis of Vibrating Screen
Authors: Ding Chuan Guang , Song Fang Zhen , Song Bo , Men Xiu Hua
Published: November 2011

The large-scale and modular design of vibrating screen brings about the trend that the screen separate from screen frame. The separation of the screen frame and the screen changes their dynamic characteristics. By making modal analysis and harmonic response analysis in ANSYS, the dynamic data of the screen and the screen frame was obtained, such as the natural frequencies, mode shapes, stress distribution and strain distribution. The results show that the stiffness of screen frame is higher than stiffness of the screen and the side plats and beams of screen are the weak parts.
A New Interpolation Algorithm for Auto Machining Technology of 3-D Profile of Die Edge
Authors: Wang Tao , Cai Yu Jun , Li Guo He
Published: November 2011

The research status of 2-D machining of cutting edge and flanging edge of automobile die are reviewed, and the key factor that influences the cycle and cost is pointed out. According to the characteristic of NC machine command and the particular requirement of cutter location precision during cutting, a new spiral interpolation algorithm is presented based on the in-depth analysis of pre-interpolation. The influences of the height of die edges, the length of cutter’s side blade and holder collision are all considered during interpolation, which make the upper cutter blade used as much as possible without any holder collision. Finally, the high-efficient auto NC machining of 3-D die edges is realized.
A Stochastic-Based Method for Finite Element Model Validation
Authors: Bi Si Feng , Deng Zhong Min
Published: November 2011

A stochastic method integrating Monte Carlo simulation (MCS) and multivariate regression analysis is presented. The main purpose of this method is to validate a finite element model taking account of variability in test systems and modeling uncertainties. An improved MCS and an iterative procedure during correlation analysis are explained. Simulation results show that the proposed method provides a satisfactory validation outcome with acceptable calculation cost, and different correlation indices generate diverse variation curves of variables. MSC.Nastran is employed with a purpose to show the methodology’s commonality.
Adaptive Quadrant Error Compensation of Embedded CNC System Based on ARM and DSP
Authors: Ding Yan Yu , Wang Guo Feng , Qiao Zhi Feng , Tang Zhi Yuan , Ling Xiang Gui
Published: November 2011

This paper proposes a method of realizing the quadrant error compensation in the embedded CNC system based on ARM and DSP. The method combines the system’s structural characteristics of software and hardware, uses an improved BP neural network algorithm to improve the compensation efficiency and achieves adaptive compensation in the premise of ensuring adequate compensation accuracy. The simulation case shows that when the feed rate changes, the method can improve the outline precision of the processing path through quadrant position.
An Algorithm for Space Tool Compensation Used in Five-Axis Numerical Control System
Authors: Zhao Liang , Dong Jing Chuan , Qiao Zhi Feng , Ding Yan Yu , Tang Zhi Yuan
Published: November 2011

This paper presents a new space cutter compensation algorithm used in five-axis CNC machines. Five-axis CNC machines are composed of three linear axes and two rotational axes, owing to its unique structure and function, especially it is adapted to free surface machining, and is used in mold, aviation and ship manufacture widely. This paper analyzes cutter’s feed path, creates a local coordinate system in the CC point by using transformation equation between CL point and CC point. In this local coordinate system cutter compensation is built, new CL point and new cutter angle is calculated. Through coordinate system transformation matrix, determine cutter absolute coordinate.
Analysis of Dynamics Characters of Bed Structure of CNC Machine Tool on FEM Method
Authors: Zhang Ya Wei , Zhang Wei Min
Published: November 2011

In order that the CNC machine tool has to achieve very high process accuracy, the bed structure has to have a reasonable construction to meet this strict technical demand. The bed structure of machine tool as a important component is analyzed in order to be clarified about its vibration mechanisms. In this paper, the dynamic character of the bed structure of HTM40100 horizontal mill-turn compound machine center is researched by the finite elements method (FEM) in the circumstance of ANSYS, and modal analysis theory is introduced and applied. Bed structure is modeled as flexible body by FEM. The harmonic response and the modal results is given by calculation and running of the model in ANSYS. The bed structure of machine meets the technical demands well enough after those analyses.
A Built-in Force Actuator for Active Unbalanced Vibration Control of Grinding Wheel
Authors: Qiao Xiao Li , Zhu Chang Sheng
Published: November 2011

To effectively control unbalanced vibration caused by grinding wheel mass unbalance, a new active control strategy for grinding wheel unbalanced vibration is proposed in the paper, the controllable electromagnetic force which is used to suppress vibration in control scheme originates from the principle of a bearingless motor having a radial magnetic force generation. First, induction electric spindle radial control force model and the force model which is exerted on grinding wheel are analyzed. And then, the dynamic model of induction-type flexural electric spindle-grinding wheel is modeled using finite element method. Finally, an active unbalanced vibration control system for electric spindle-grinding wheel is designed and simulated. The results show that the control scheme has significant effect on suppressing the unbalanced vibration of grinding wheel.
Fuzzy Sliding Mode Control for a Three-Links Spatial Robot Based on RBF Neural Network
Authors: Hu Sheng Bin , Lu Min Xun
Published: November 2011

To achieve the tracing control of a three-links spatial robot, a adaptive fuzzy sliding mode controller based on radial basis function neural network is proposed in this paper. The exponential sliding mode controller is divided into two parts: equivalent part and exponential corrective part. To realize the control without the model information of the system, a radial basis function neural network is designed to estimate the equivalent part. To diminish the chattering, a fuzzy controller is designed to adjust the corrective part according to sliding surface. The simulation studies have been carried out to show the tracking performance of a three-links spatial robot. Simulation results show the validity of the control scheme.
Numerical Prediction on Noise from Axial Flow Fan Based on Modified Blade Force Model
Authors: Wu C.J. , Zhang X.Y.
Published: November 2011

This paper presents a modification to the existing blade force model of Wu et al. [5] to predict noise radiated from a low-pressure axial flow fan. The aerodynamic theory for the fan impeller is introduced and the module analysis is conducted to calculate the flow parameters more accurately, the lift coefficient is modified by taking into account the specific shape of the blade, and an empirical parameter is also replaced by the CFD simulation based on FLUENT software. The numerical prediction on the noise radiated from the fan is performed by using the modified model, and the predicted results are more closely to the experimental results than those before modification.
Research on the Information Extraction Technology of STEP
Authors: Liu Xue Bin , Zhao Wei , Li Chong Ning , Hu De Ji
Published: November 2011

In order to generate STEP-NC data model in keeping with the ISO14649 protocol, extend the STEP model to the field of the CNC, the paper analyzes STEP standard and its file structure, develops the display software which can be read and display the STEP format file based on open source Open CASCADE geometric kernel by using the Visual Studio 2008 software development environment, designs one instance by using Pro/E software, and stored as a STEP format file in Pro/E environment, and then, using the software developed to read and display the STEP file. The results of this study improve the product data exchange and integration capabilities, lay a good foundation for generating the STEP-NC format file in the future, extracting the file STEP-NC machining information, and achieving CAD / CAM / CAPP integration system.
Stability Analysis of Turning Process Based on a 2-DOFs Model with Overlap Factor
Authors: Zhang Lai Xi , Wang Xing Song , Liu Shu Lin
Published: November 2011

A new 2-DOFs dynamic turning model including the compliance of workpiece and cutting tool is developed. In past studies, most of them were based on SDOF models and either the workpiece or tool was simplified as rigid one. Meanwhile, traditional regenerative chatter models focus mainly on cross cutting which was particularly prone to chatter. It is evident that such models cannot descript cutting system comprehensively. In order to tackle this problem, we introduce the overlap factor making the new model also suitable for length-wise cutting. Stability was analyzed after performing the Laplace transformation, correlation between critical chip width and spindle speed was derived. Simulation suggests that the new model has a larger critical chip width which complies with practical situation.
The Development of DNC Transfer Software Used in CNC Machine Tools
Authors: Xun Jing Bin , Wang Gang , Qiao Zhi Feng , Ding Yan Yu , Ling Xiang Gui , Tang Zhi Yuan
Published: November 2011

The network manufacturing technology of CNC machine tools can greatly increase their manufacturing efficiency, reduce production costs, enhance competitiveness and has significant practical significance. The paper studied the communication techniques used in CNC machine tool, took the programs developed in the practical application for example, described the process of preparing the application serial communication, completed the overall design of the structure of DNC system.
The Machining Parameters Online Monitoring Method for Stability Prediction
Authors: Jiang Yong Xiang , Deng San Peng , Qi Yu Ming , Du Bing
Published: November 2011

Unstable grinding due to the regenerative chatter is one of the most critical errors and a serious limitation to achieve good surface quality. The machining accuracy of CNC is greatly depending on online detecting, prediction and control ability of abnormal phenomena in machining such as chatter. Based on the mechanism of regenerative chatter, the dynamic models of cylindrical plunging are established by considering both the rotate speed of workpiece and grinding wheel. The traverse grinding can be assumed as the sum of several stepwise plunging grinding with respect to the grinding contact area. The stability caused by online detecting indexes of grinding parameters was analyzed. Grinding experiments of online chatter detecting were carried out and agreed well with the theoretical results that show good application future for online chatter detecting.
Study on an EV Traction Control Strategy
Authors: Yan Shi Rong , Li Shi Zhong
Published: November 2011

According to an electrical vehicle (EV) construction and working principle, a dynamic model governing its motion was established. A built-in permanent magnet synchronous motor was selected as its driving motor and a mathematical model about the motor working principle was described also. To get good motion effect, a motor driving control system with a current loop and a speed loop was developed. The current loop consists of maximum torque per ampere control and field weakening control. The speed loop is based on a sliding mode control. To make the EV working more smooth, stable and safer, its traction control includes driving motor control and wheel braking control. During some acceleration or cornering, wheel braking control is introduced to keep driving wheels in good slip states, especially to make the car in a good stable and safe state. Simulation study based on MATLAB/Simulink showed the control strategy developed here can make the EV work well, even when it runs on some asymmetric road.
An Experiment Study on the Dynamic Characteristics of Linear Rolling Guide
Authors: Zhao Li Bo , Weng Ze Yu , Ding Hong Gang , Shen Xiao Qing , Tang Xue Zhe
Published: November 2011

Linear rolling guide has gained wide application in various CNC machines. As a main joint of the machine tools, it makes great impact on the dynamic characteristics of machine tools. It is therefore necessary to study the dynamic behavior of linear rolling guide. And external load is a factor that affects the dynamic characteristics of linear rolling guide. In this paper experimental approach was used with the aim of studying effects of external load on dynamic behavior of linear rolling guide. The experiment contained some modal tests of linear rolling guide ways when they were loaded forces of different sizes.
Application Research of Improved BP Algorithm
Authors: Yang Cheng , Shi Chao
Published: November 2011

Based on JS engine, this paper made a detailed analysis on the standard BP algorithm, BP algorithm with additional momentum item, BP algorithm of parameter to adjust and BP network based on LM algorithm .Finally, this paper gets the optimization algorithm and network by comparing in training step and diagnostic accuracy. In the end, the front panel of the diagnosis system is designed by MATLAB graphical user interface.
Study on Denoising of Corrosion Acoustic Emission Signals of Tank Bottom Based on Independent Component Analysis
Authors: Yu Yang , Zhao Jia
Published: November 2011

When tank bottom is detected by acoustic emission method, many corrosion acoustic emission signals can be obtained and adulterated many noise signals, which influence badly the estimation to the corrosion situation of tank bottom. In order to identify acoustic emission sources and disturbance sources without changing the characterization of acoustic emission sources, independent component analysis is used to deal with the denoising of corrosion acoustic emission signals of tank bottom in this paper. In the paper, acoustic emission signals of double exponential model is respectively mixed with white noise signals and stochastic noise signals, and acoustic emission sources and disturbance sources are respectively represented by double exponential model of acoustic emission signals and noise signals, which are independent on statistics, and then FastICA is used to simulation analysis, which is successful to identify acoustic emission signals and white noise signals. The results demonstrate that fastICA is effective to denoise acoustic emission signals.
LiMn2O4 Prepared by a Flameless Solution Combustion Synthesis: The Effect of Ignition Temperature
Authors: Liu Gui Yang , Guo Jun Ming , Li Yan Nan , Wang Bao Sen , He Ying
Published: November 2011

Spinel LiMn2O4 have been prepared by a flameless solution combustion synthesis, using nitrate and acetate salts as raw materials without any fuels. The effect of ignition temperature on the phase structure, micro morphology and electrochemical performance has been studied. The results indicate that spinel LiMn2O4 with single phase can be prepared successfully by the present method at the ignition temperatures of 300-800°C and calcination temperature of 600°C for 5h. The crystallinity, dispersity of the gains and electrochemical performance of the products increase with the decreasing ignition temperatures.