bluuebunny/crossref_metadata_2025 huggingface dataset:
Oxidation Resistant of Silicon-Boron Pitch Carbonization Product
Authors: Zuo Xiao Hua , Li Xuan Ke , Dong Zhi Jun , Yuan Guan Ming , Cui Zheng Wei
Published: March 2013

The silicon-boron(Si-B) pitch was successfully synthesized by solution-thermal treatment method using coal pitch, polycarbosilane and borane pyridine as starting materials. The B-Si pitch carbonization product was attained by carbonization in the temperature 900°C under flowing argon. The Si-B pitch prepared and its carbonization product were characterized by SEM, FT-IR, TG-DSC and XRD. The results show that the carbonization product has C-Si and C-B bonds and the silicon and boron components of the product is still amorphous when it is treated at 900°C. The weight loss of the Si-B pitch carbonization product at 900°C for 12h in air atmosphere is only 3.76wt%. The weight loss of the product is less than 4 wt% when the oxidation temperature reaches 1180°C. The prepared B-Si pitch carbonization product possesses good anti-oxidation property at high temperature in air atmosphere.
Study on the Influence of Porous Anodic Alumina Membrane on Separation of Hydrogen and Methane
Authors: Yang Qi Peng , Zhao Xue Bo , Wang Xiu Lin
Published: March 2013

Hydrogen and methane have been regarded as the main energy for future. In recent years, membrane technology has developed to be an attractive technology to separate them. In this paper, porous anodic alumina membranes at different thickness were prepared for separation of hydrogen and methane. The thickness varied from about 77 to 250 μm, moreover, the SEM (Scanning Electron Microscopy) images show a good linear relationship between the thickness (y) and anodizing time (x), with the fitting being y = 22.56x - 36.082. Gas permeance and separation index for hydrogen and methane were measured at different conditions, such as thickness and temperature. With the thickness increased, the permeances of two gases were decreased quickly but separation index vice versa. In this research, the actual separation index changed from 1.9 to 3.2.
Preparation and Properties of Copolyimides Containing Fluorine and Alicyclic Group
Authors: Lu Yun Hua , Xiao Guo Yong , Dong Yan , Hu Zhi Zhi , Luan Li Na
Published: March 2013

The copolyimides containing fluorine and alicyclic groups were synthesized from 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (6FAPB) and two dianhydrides, 1,2,3,4-cyclobutanetrtracarboxylic dianhydride (CBDA) and 3,3’,4,4’-biphenyltetracarboxylic acid dianhydride (BPDA) in various mole ratios via thermal imidization. The introduction of fluorinated group and alicyclic structure into polyimide improved the transparency of copolyimides. The structure and properties of copolyimides were characterized by FT-IR, UV-vis and solubility testing, and the effect of monomers on the properties of polyimides was also investigated. These experimental results showed that the copolyimides containing a higher mole ratio of CBDA have higher optical transparency and better solubility in organic solvents.
A Novel Effective Y-Shaped Silicon Stent for Treating Canalicular Laceration
Authors: Sun Xiao Ting , Zhou Qi , Du Fei , Wu Ming Feng , Tang Shen Fei , Bi Yan Long
Published: March 2013

Purpose: To introduce the novel effective Y-shaped silicon stent for treating canalicular laceration. Methods: Fifty-four canalicular laceration cases (54 eyes) underwent the lacrimal surgery using the novel Y-shaped silicon stents were collected, and the stents were removed 3 months after surgery. All cases were followed up for 12 months. The operability of stenting and removing the stent were assessed. The data we collected during each follow-up are: stent position and integrity, aesthetic results, the discomfort, the symptom of epiphora, the patency of lacrimal passage, complications, and patient’s satisfaction. Results: The stenting time was 14.3±5.8 min and the time of removing it was 1.8±0.5 min. Both of the operability of stenting and removing were accessed to be easy in more than 94.4% cases. All stents were in position and integrated. 51 cases (94.4%) had no problems on aesthetic results. Three patients (5.4%) complained about the discomfort. Two cases (3.7%) had the symptom of epiphora, which were obstructed after removing the stents. Fifty-two cases (96.3%) were with patent canaliculus and satisfied with the surgery and symptom improvement. Only 5 cases (9.3%) had complications. Conclusion: The novel Y-shaped silicon stent is an effective stent for treating canalicular laceration.
Extraction of the Pectin from Virginica Stem Bark and Study on its Structure and Composition
Authors: Fan Li Shan , Zhao Lei
Published: March 2013

Using virginica stem bark as raw material, extracted with hydrochloric acid, sulfuric acid, and tartaric acid through an orthogonal experiment. Then, the structure of pectin was analyzed and compared with mulberry pectin. The result showed that the pectin extraction rate was stable and relative high when using tartaric acid diluents as extracting solution, with pH value at 2 and extraction time of 90 minutes. There were certain differences about the color of the pectin when extraction process was different. Infrared spectrum analysis showed that the composition of the pectin in virginica stem bark was basically same as that in mulberry branch bark.
Zinc Hydroxystannate-Coated Mineral Grade Mg(OH)2 as Flame-Retardant and Smoke Suppression for Flexible PVC
Authors: Wang Chun Zheng , Wu Wei Hong , Ye Xia , Liu Lei
Published: March 2013

A zinc hydroxystannate-coated mineral grade Mg(OH)2 (ZHSCMH) was synthesized as flame retardant and smoke suppressant for flexible poly (vinyl chloride). The powder of ZHSCMH was characterized by the x-ray diffraction (XRD) and scanning electron microscopy (SEM). The flame retardancy, smoke suppression and thermal behavior of PVC treated with ZHSCMH and mineral grade Mg(OH)2 were comparative studied by means of limiting oxygen index (LOI), smoke density rating (SDR), thermogravimetry (TG), differential thermogravimetry (DTG) and SEM. The results show that, ZHSCMH can be used as a high effective flame retardant and smoke suppressant for PVC. The flame retardant of ZHSCMH can effectively promote the crosslinking reaction of poly (vinyl chloride) (PVC) in the first stage, and improve the stability of the char residue in the second stage.
Flame Retardant Low Density Polyethylene with Aluminium Hydroxide/ Commercial Fire Retardants FR01 Synergistic System
Authors: Wang Ni Na , Xiang Ding Han , Mo Pin Shu , Lu Yi
Published: March 2013

Low density polyethylene (LDPE) was modified by the addition of commercial fire retardants FR01 and aluminium hydroxide (ATH). ATH/FR01/LDPE composites were prepared by melt blending and extrusion in a twin-screw extruder. ATH was first modified by a silane coupling agent KH550 then added to LDPE. The flame retardancy, electrical property and thermal behavior of the LDPE composites were investigated by limiting oxygen index (LOI), volume resistivity and thermogravimetric analysis (TGA), respectively. The results indicated that the surface modification of ATH (M-ATH) could greatly improve the dispersibility and compatibility with LDPE matrix. The mechanical property tests showed good mechanical properties of composite, compared with unmodified one, tensile strength and elongation of M-ATH/LDPE were all improved, and the addition of FR01 improved the flame retardancy of ATH/LDPE remarkably. TGA results demonstrate that char yield of M-ATH/FR01/LDPE (30/15/70) reaches 27 wt% at 600 °C in Ar atmosphere.
Study on the Optimization of Copolymerization Conditions of LASP/AA/AM Polymer
Authors: Liu Jian Liang , Tan Ai Ling , Chen Lu , Cui Ying De
Published: March 2013

The copolymerization processes and the optimal conditions of LASP/AA/AM polymer with initiator, crosslinking agent were studied. The results show that the water absorption ratio and the salt-water absorption ratio of LASP/AA/AM polymer are 1017g/g and 98.02 g/g, respectively. The optimal conditions of LASP/AA/AM copolymerization are: WLASP:WAA+AM=8%, Wcrosslinker :WAA+AM=0.02%, W initiator :WAA+AM=0.5%, WAA:WAM=7 : 3.
Assessment of Functionality of Aged Cables at Loading by Heat Flux
Authors: Turekova Ivana , Harangozo Jozef , Turnova Zuzana , Balog Karol
Published: March 2013

Polymers belong to most spread organic flammable materials. They are decisive material – insulator also in cable production. Regarding the safety of buildings it is necessary to know their fire-technical characteristics, which predict their behaviour in case of fire. The article deals with testing cables protected and non-protected with intumescent coating, exposed to heat flux, in dependence on distance. A special equipment was developed for testing the inflammability, allowing objectivisation of critical conditions leading to ignition of tested materials.
Exposure Schedule for Uniform Diffraction Efficiency of Partially-Overlapping Multiple Holograms in Dual Monomers Photopolymers
Authors: Song Wei , Tao Shi Quan , Wang Da Yong , Wang Yun Xin , Marx Lisa
Published: March 2013

The exposure schedule model of uniform diffraction efficiency in single monomer photopolymer is extended to that in dual monomers with partially-overlapping multiplexing methods. The proposed model can be thought of solving an optimization problem. The exposure schedule for 51 holograms are calculated and verified by the numerical simulation. The result shows that the exposure schedule is effective to produce the uniform diffraction efficiency for the multiplexing holographic storage.
Fabrication of Silicon Nanowires by Electroless Etching for Thermoelectric Application
Authors: Tsai Hsin Luen
Published: March 2013

The fabrication procedure of silicon nanowire thermoelectric device has been developed based on the electroless etching method. Under a fixed etching solution concentration ratio and the etching reaction temperature, silicon nanowire arrays of different lengths manufactured at different etching time were investigated. The longer etching time results in the longer nanowire length. The silicon nanowire arrays were utilized to produce a silicon nanowire thermoelectric device. The I-V characteristics of the present SiNWs thermoelectric device were recorded under different heating temperatures, and the power outputs of silicon nanowire thermoelectric devices were calculated. The longer the silicon nanowire thermoelectric device lines, the greater the power output of thermoelectric device is. The SiNWs TED power output in the present study ranges from 1.62 to 7.2 nano-Watt with the chip size 2×2 cm2 while the applied temperature at 150 °C.
The Study of Au/TiO2/Au Resistive Switching Memory with Crosspoint Structure
Authors: Yan An , Liu Gang , Zhang Chao , Fang Liang
Published: March 2013

This paper presets a process of fabrication and measurements of Au/TiO2/Au resistive switching memory. The device was fabricated using crosspoint structure, and the electrode width and TiO2 film of which are 1 µm and 50 nm. According to our experimental result, resistive switching cells exhibit good stability and reliability with bipolar resistive switching behavior.
Combustion Synthesis of Nanocrystalline Y2O2S: Eu 3+ , Mg 2+ , Ti 4+ Red Long-Lasting Phosphors Using Mixture Fuel of Thiourea and Citric Acid
Authors: Han Xiao Bao , Li Xiang Guo , Peng Gui Hua , Liang Zhen Hua , Wang Xia
Published: March 2013

Nanocrystalline Y2O2S: Eu 3+ , Mg 2+ , Ti 4+ red long-lasting phosphor was synthesized successfully by combustion method using thiourea and citric acid as fuel. The structure, morphology and luminescent properties of these phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy (PL). The experimental results revealed that the phosphor was composed of sheet-shaped Y2O2S with hexagonal crystal structure. They exhibited strong red emission at 617 nm and 626nm. In addition, the dosage of citric acid has great effect on the phosphor. When molar ratio of citric acid to Y 3+ is 1.3, the resulted phosphor gives the highest emission intensity.
The Effect of Density on Polyesterification Kinetics of Neopentyi Glycol/Maleic Anhydride System
Authors: Shi Xiao Ni , Wu Bo , Zhang Wei Lu
Published: March 2013

A general kinetics equation was deduced for bifunctional polyesterification taken account of the changes of density during the reaction process. Kinetics parameters were given by using mol•L-1 and mol•kg-1 as the unit, respectively. The results show that the kinetic parameters expressed with mol•L-1 are greater than those with mol•kg-1 in the system of Neopentyi glycol/Maleic anhydride, and particularly the relative errors between them are increased along with the rise of temperatures.
Preparation of Hollow Microsphere and its Application in Paper Coating
Authors: Jin Li Qiang , Xu Qing Hua
Published: March 2013

A novel hollow microsphere plastic pigment was prepared by the soap-free seeded emulsion polymerization. This pigment, with polyacrylate as core and with polystyrene as shell (PA/PSt) had hollow structure after dryness. The latex was characterized by transmission electron microscopy (TEM), Fourier transform infrared spectra (FTIR), and particle size analysis. The synthetic pigment was applied in the paper coating, and its influence on the printablility of the coated paper was investigated. The results show that the overall properties of the coated paper can be effectively improved when the clay in the base formulation is replaced by a small amount of hollow microsphere plastic pigment.
Preparation of Low-Sulfur Expanded Graphite with Different Size Particles
Authors: Wang Chun Yu , Li Huan Ran , Qin Chun Lin , Zhang Peng
Published: March 2013

In this paper, results shows that expanded graphite of 128mL/g could be produced under the nitric acid treatment with the optimum mixture ratio of graphite: HNO3: H2O2: KMnO4 being 1(g):6(ml):2(ml):0.02(g), compared with the 145ml/g under the sulfuric acid treatment (graphite: H2SO4: H2O2 =1(g):3(ml):2 (ml)). The sulfur contents are ~0.10wt.% in EG with nitric acid treatment, and ~0.24wt.% in EG with sulfuric acid treatment, respectively. Therefore, the nitric acid treatment EG has little sulfur, which is greatly demanded in engineering application.
Thermal Degradation Study of Lithium and Potassium Iodide/Epoxidized Natural Rubber Polymer Electrolytes
Authors: Leng Tan Wei , Yeoh Yuan Xiang , Abu Bakar Mohamad
Published: March 2013

Lithium iodide/epoxidized natural rubber (LiI/ENR-50) and potassium iodide/epoxized natural rubber (KI/ENR-50) polymer electrolytes (PEs) were prepared via solvent casting. The PEs were characterized using FTIR, DSC and SEM techniques. The observed IR bands shift and the increased in Tg value in both PEs suggest that some interactions may have occurred between the ENR-50 and the respective cations. The appearance of new C=O band at ~1720 cm-1 coupled with the intensification of the OH band in KI/ENR-50 was due to the early degradation of ENR-50 promoted by KI. The kinetic analyses of the thermal degradation of neat ENR-50 and the respective PEs were studied using TG at five different heating rates. Kissinger was employed to obtain the degradation activation energy (Ed). LiI/ENR-50 shows higher Ed as compared to pristine ENR-50 and the Ed increases with increasing LiI loading. The Ed of KI/ENR-50 was observed to be higher than that of pristine ENR-50 when KI is 30 wt %. Thus, LiI retards the degradation of ENR-50 regardless of the wt % LiI added. KI, however, can either retard or catalyzed the degradation of ENR-50 depending on the salt loading.
Research on the Influence of PEG to the Nuclei Population Density of Copper Electrocrystallization
Authors: Wang Qing Mei , Sun Feng Yan
Published: March 2013

Influences of the concentration of additive PEG and overpotential on the Nuclei population density of copper electrocrystallization on a glass carbon electrode (GCE) have been studied in this file. We characterized the experimental data extracted from Li’s work [10] with the least square method and exponential curves. The relationship of nucleation number density and overpotential follows the exponential function basically has been obtained by carrying on the data fitting to experimental data. And with a given overpotential, when inject PEG into acidic cupric sulphate electrolyte with a lower concentration, nucleation number density is reduced, but when the injection concentration of PEG is high enough, nucleation number density is increased instead. While with a certain concentration of PEG, as the overpotential more negative, the nuclei population density increased gradually, but if the injection concentration is low, the change of the growth rate of nucleation number density is not significant.
A Density Functional Study of PdCn(n= 2-12) Clusters
Authors: Wei Yan , Xu Jia Xin , Yuan Xiao Mei , Zheng Xiao Hui
Published: March 2013

We have studied the structures and electronic properties of PdCn (n=2-12) using the density functional theory in this paper. Though calculating, we found that the linear isomers are most stable for PdCn(n=2-9) clusters. N=10 is turning point, and the bicyclical structure is most stable for PdC10 cluster. Cyclic structures have the lowest energy for PdC11 and PdC12 clusters.
Structures of Li1+xMn2-XO4 Synthesized by Different Methods
Authors: Liang Xing Hua , Liu Tian Jiao , Hua Xiao Ming
Published: March 2013

In the paper, Li1+xMn2-xO4 are synthesized by ball-milling method and coprecipitation method. The phases of three compounds have been analyzed by X-ray diffraction to compare diffraction peak, crystal system and crystal lattice′ s size. Advisedly, the results show that a compound has more purity phase and better crystallinity. Synthetic method and reaction conditions of this compound are as follows: via coprecipitation method, heat the sample at 250°C for 4h in air, followed by heating at 750°C for 36h in air. This analysis provides a reasonable and valuable thinking for research of the structures of Li1+xMn2-xO4. And it is propitious to develop the positive material of lithium battery.
Electrochemical Behaviors of Different Gradesof Pure Aluminum in Alkaline Solution
Authors: Yu Zhu Xiao , Hao Shi Xiong , Fu Qing Shan
Published: March 2013

Effects of impurity (Fe, Si, Cu), temperature and Na2SnO3 on anodic behaviors of various grades of pure aluminum namely Al-1(99.999%),Al-2(99.99%),Al-3(99.82%) and Al-4(99.5%) in 4mol/L KOH solution have been examined by studying corrosion rate, polarization , open circuit potential (OCP, or Eocp), discharge performance and transfer resistance values (Rt) of EIS. The results indicate that aluminum has higher activation and more severe corrosion with the temperature increase. When impurities (Fe, Si, Cu) content increases, aluminum has higher corrosion and achieving stationary open current potential (OCP) needs longer time. However, Al-3 has lower polarization and higher current density(400mA/cm2,at 1.224V) than others at 50 °C. Meanwhile, for Al-3, the stationary OCP is about 120 mV more negative at 50 °C than at 25 °C. In order to achieve the stationary OCPs and avoid the appearance of tin oxidation peak, 20min is suitable soaking time for Al in 5mmol/LNa2SnO3 +4mol/LKOH solution. The optimal electrochemical behaviors of Al including corrosion-resistance, activation , OCP and shorter delay time of electrode potential, have been achieved by adding 5mmol/L SnO32+ into 4mol/LKOH solution.
Research Progresses of Two Kinds of Novel Electrolyte Lithium Salts: Lithium Bis(oxalato) Borate and Lithium Oxalyldifluroborate
Authors: Yu Tao , Zhang Hong Ming , Xu Xiao Li , Cui Xiao Ling , Mao Li Ping
Published: March 2013

Lithium bis(oxalato)borate (LiBOB) and lithium oxalyldifluroborate (LiODFB) are promising boron-based lithium salts for lithium ion batteries. Advantages, disadvantages, and recent developments of each lithium salt were introduced respectively in this article. In addition, ionic conductivities and compatibilities with electrode materials were emphatically reviewed.
Alloy Design and Microstructure Control for the Production of Heavy Ductile Irons Used in Large-Scale Windmills
Authors: Pan Yung Ning , Lin Chi Chia , Chang Re Mo
Published: March 2013

The primary purpose of this research is to establish the optimal alloy design and microstructure for achieving the desired mechanical properties (tensile strength, yield strength, elongation and low temperature impact value) of key components used in large-scale windmills. In order to meet the impact requirement (I-40°C≥10J) of spec. EN-GJS-350-22U-LT, the Si content should be kept below 1.97%, and also the maximum pearlite content shouldn’t exceed 7.8%. On the other hand, the optimal alloy designs that can comply with specification EN-GJS-700-2U include 0.25%Mn+0.8%Cu+0.01%Sn , 0.25%Mn+0.6%Cu+0.05%Sn and 0.45%Mn+0.6%Cu+0.01%Sn. Furthermore, based upon the experimental results, multiple regression analyses have been performed to correlate the mechanical properties with chemical compositions and microstructures. The derived regression equations can be used to attain the optimal alloy design for castings with targeted specifications. Furthermore, by employing these regression equations, the mechanical properties can be predicted based upon the chemical compositions and microstructures of cast irons.
The Evolution of M/A in Ultra-Low Carbon Bainite Steel
Authors: Nie Yi , Shang Cheng Jia , He Xin Lai
Published: March 2013

The amount, size and structure of M/A in ultra low carbon bainitic steels，which are mainly affect by the transformation process, the cooling rate and the tempering treatments, have been investigated. The different cooling rate induce the variation of distribution of amount and size of M/A. There are bigger M/A mass with harder phase at low cooling rate while smaller M/A with less hard phase at high cooling rate. A series tempering tests have been carried out, which indicating that the tempering treatment has significant effect on the evolution of M/A.
Effect of Ultrasonic Inoculation Treatment on Distribution of Sulphur in Fe-S Alloy
Authors: Li Jie , Wang Xiao Lan , Zhou Chang Cheng , Wang Guo Liang , Ge Cheng Ling
Published: March 2013

Influence of ultrasonic inoculation treatment on distribution of sulphur in Fe-S alloy was mainly studied. Results showed that Ultrasonic treatment could reduce the segregation degree of sulfur in Fe-S alloy and make the distribution more uniform. When the ultrasonic treatment time was 60s, sulfur segregation was in the lowest of 0.3799, and homogeneity was in the maximum of 0.5470.While treated with ultrasonic power of 150W, sulfur segregation was 0.5068, and sulfur segregation was improved, but homogeneity of sulfur decreased to 0.3411, overall homogeneity distribution of sulfur decreased.
Human Body Detection in Search and Rescue Operation Conducted by Unmanned Aerial Vehicles
Authors: Krerngkamjornkit Rapee , Simic Milan
Published: March 2013

Human body detection is a fundamental research problem where computer vision could be applied. This research area has wide applications including surveillance, search and rescue missions. Building an effective human body detector framework under wide ranges of weather, lighting and environmental conditions is a challenge task. A variety of sensors and optimisation algorithms are proposed. This paper aims to review the human body detection methodology conducted by the Unmanned Aerial Vehicles (UAV), and the future research for the UAV search and rescue applications.
An Improvement and Simulation of NURBS Curve Algorithm
Authors: Qiu Guo Qing , Tu Le Fei , Jiang Tian Yue , Feng Han Qing
Published: March 2013

Although the chord height error might be ensured, the adaptive algorithm of the NURBS curve circular interpolation feed rate is still likely to result in the speed fluctuation which is not in accordance with given acceleration or deceleration rules. On the foundation of the analytic principle of the NURBS curve circular interpolation, a kind of interpolating algorithm based on the NURBS curve continuous small segments of S-shaped acceleration and deceleration is presented. And considering the chord height error, the variable step and feed rate can be effectively combined to make a better estimation. The simulation results on real examples show that the method not only simplifies the complicated calculation of curve interpolation process, simultaneously improves the speed of Motion Smoothing Implementation for NURBS curve interpolation, but also ensures the interpolation precision. The algorithm can be commonly applied in real manufacturing for high-speed and high-precision curve process.
The Design and Numerical Study on Flow Characteristics of High Temperature and High Pressure Steam Trap
Authors: Li Shu Xun , Zhang Xing , Zhou Shi Hao , Xu Deng Wei
Published: March 2013

In order to solve the problem of the flow-induced vibration under high temperature and high pressure when opening or closing the steam trap, sleeve was designed and three-dimensional numerical simulation of the internal turbulent fluid field was performed by using Fluent of computational fluid dynamics software. When sleeve is installed ,the results show that flow-adjusting characteristic is equal percentage for different travels , meanwhile, meet the rules that low flow rate is at small opening and large flow is at maximum open degree. It is benefited to suppress the generation of pressure fluctuation and pipe-vibration. This paper will provide a reference for the design of more excellent performance steam trap.
The Application of the Improved Bootstrap Method in the Verification of Maintainability Indicators of CNC Machine Tools
Authors: Yu Jie , Song Yu Mei , Yu Shuang , Wang Ting Ting , Li Qiao Chan , Sun Li Da , Li Zhan Guo
Published: March 2013

Bootstrap Method is commonly used in statistical inference and is convenient and practical in data processing. The paper puts forward an improved Bootstrap method which expands the range of resampling procedure to verify the maintenance indicators with a few test samples.
Method of Corner Smooth Transition Based on Interpolation Spline
Authors: Huang Jian , Song Ai Ping , Tao Jian Ming , Yi Dan Ping
Published: March 2013

Adjustable form cubic interpolation spline curve, changing its form adjustment coefficient can adjust the curvature radius and shape. Using this spline curve can realize the high-speed smooth connecting between adjacent processing trajectory during NC movement. To internal outline corner transition, use cambered spline transfer curve; To external outline corner transition, can use cambered or toroidal spline transfer curve. During the corner transition process, keep the speed constant, adjust the curvature the curvature radius to control the value of acceleration. Corner smooth transition based on the interpolation spline, can effectively reduce the mutation of acceleration, improve processing efficiency, and weaken the impact to the machine tool.
Supporting Force Analysis of Oil Pads in Hydrostatic Rotary Table of Heavy Duty CNC Machine
Authors: Cai Li Gang , Shi Xiao , Zhao Yong Sheng
Published: March 2013

According to the characteristics of constant flow and closed hydrostatic rotary table used in heavy duty CNC machine, in order to consider the interaction between structural deformation of worktable and the supporting force of oil pads, an iteration method between hydrostatic theory calculation and finite element method (FEM) is used to get the real supporting force of each oil pad at different carrying state. The result is compared with the situation which is not considering the deformation of worktable and the difference between them can be used to guide the design of hydrostatic oil pads. The optimal radius of supporting point of work piece is also achieved using this method, which can provide theory basis for supporting point distribution of heavy work piece.
Design of a Cutting Tools Information Integrated System
Authors: Yuan Mei Xia , Gao Zhen Li , Dou Yun Ping , Tang Bo Yan , Li Shen Wang , Ma Li Ping
Published: March 2013

The paper introduces the structure and functional modules of the cutting tools information integrated system technology. We can manage the information on cutting tools efficiently by using the system. According to process feature we may select the appropriate cutting tools and the optimized cutting parameters .The system has the advantage of good generality, flexible application and fine opening. By using it, the efficiency of selecting tools and cutting parameters can be greatly improved.
The Bending Vibration Analysis on the Main Drive Axis of CNC Spiral Bevel Gear Milling Machine
Authors: Yu Li Juan , Yang Zhao Jun , Liu Fu You
Published: March 2013

Gear machine tool main drive shaft to avoid resonance problem is studied.The force of the drive shaft is analyzed, and the vibration form of the drive shaft is confirmed. Using the lumped parameter method to simplify the main drive shaft, the lumped mass model and the force model were been obtained. When bending vibrating, the natural frequency of the main drive shaft is calculated using the transfer matrix method. The calculated critical speed is 43755r/min, which far outweighs the motor rated speed .It means that the drive shaft under normal work won't be resonance, which accords with the request of production.
A Regulator Parameter Setting Simulation Research on Double Closed Loop Speed Control System
Authors: Liu Wen Tao , Yuan Zhong Hu , Han Xiao Wei
Published: March 2013

For the good performance of Double closed-loop DC speed control system, it is widely used . When the motor are selected, the parameters of the system can not be changed. Then,the system performance can only be improved by changing the parameters of the inner ring current regulator and outer ring speed regulator of the double-loop DC converter system. This paper studies mathematical modeling and system simulation of Direct Current Governor System on Matlab simulink platform. The simulation method, can adjust the system controller parameters flexibly, so as to achieve the ideal design results, and the design of the system are analyzed, the optimal "parameter range" is found, It can save the time of system development,and improve the standardization degree of system design.And the simulation results of the system can provide primary plannings and guidances for the actual system design,thereby lower the design cost of hardware largely, enhance the accuracy of hardware installation.
Output Feedback Stabilization of Uncertain Nonholonomic Chained Systems
Authors: Wang Zhu Ping , Yuan Zhan Ping , Chen Qi Jun
Published: March 2013

In this paper, output feedback stabilization problem of a class of nonholonomic systems in chained form with drift nonlinearity and unknown virtual control coefficients is considered. Observer-based output feedback design is developed when only partial system states are measurable. The control laws are developed using state scaling and backstepping techniques. The proposed control strategies can steer the system globally converge to the origin.
The Development of the Closed-Loop Control System for the Mechanical Suspensions Test Rig
Authors: Liu Yan
Published: March 2013

Frequency and amplitude of the existing mechanical suspension performance test rig can not change. And it has signal function. Frequency changing devices and amplitude adjustment mechanism were designed on it by study. Frequency and amplitude of the improved test rig can change within a certain range. It has two control algorithms: fixed-frequency vibration and sweep vibration. And the used closed-loop control in the system ensures the reliability of the system. The results show feasibility and correctness of this control system by a large number of experiments. It improves the function of the test rig and decreases the cost of study.
The Research on Shaft Center Position of Ultra-Supercritical Steam-Turbine Generator
Authors: Liu Zhan Hui , Bao He Jun
Published: March 2013

The shaft center of steam-turbine generator, showing relative position of shaft and bearing bush, would changed when jacking oil pump or turning gear started, raising speed and loading carrying. The change of bear carrying, oil film rigidity and clearance variation in flow passage of steam-turbine generator could be deduced through measuring shaft center position and analyzing its variation to working conditions, which would be helpful for treating vibration malfunction cased by deficiency of oil film rigidity, steam flow exciting and rubbing.
Research on Assistance Control Algorithm for Electric Power Steering System Based on Robust Control Theory
Authors: Liu Chao Ying , Wu Wen Jiang , Wang Zhan Zhong , Gao Zhan Feng
Published: March 2013

Assistance control is an important control model of electric power steering system. When designing assistance control algorithm, we should not only consider the handiness and stability of steering, but also think of the assistance stability and disturbance resistance from the road surface. In order to improve the overall performance of electric power steering, robust control theory is applied to develop the assistance control algorithm. Based on the above, a robust controller was designed. The influences of the assistance torque deviation and the road surface disturbance on steering were selected as the controlled output. Then the designed controller was tested on electric power steering test bed. The test results show that the robust controller is of better assistant performance than traditional PID controller.
Stability Control for Dual-Motor Independent Drive Electric Vehicle Based on Sliding Mode Control
Authors: Lin Cheng , Peng Chun Lei
Published: March 2013

Two motors of Dual-Motor Independent Drive Electric Vehicle can be controlled independently, which can enrich the method of stability control for vehicle. In order to fully take use of the advantage，The man-vehicle system with eight degrees of freedom ,which includes Magic Formula tire model and driver model based on Preview Follower Theory, was set up by using MATLAB/SIMULINK. Considering the complexity of the driving condition and the nonlinear time-varying characteristics of the vehicle systems, a controller based on Sliding mode variable structure control theory was set up, which selected Yaw rate as Control variable and two motors as actuators. The simulation results show that handling and stability of vehicle can be improved greatly by the Sliding mode controller.
Thrust Hydraulic System of Casing Rotater with Flow Adaptive Control
Authors: Lu Xian Bin , Wei Jian Hua , Feng Rui Lin , Zhang Qiang
Published: March 2013

Thrust system is the key system of casing rotator. A thrust hydraulic system with flow adaptive control is designed, operating principle and control method are elaborated as well. In order to investigate the dynamic characteristics of the thrust hydraulic system, simulation analyses with the combined platform of AMESim and MATLAB/Simulink are carried out. The simulation results show that the designed thrust hydraulic system can meet the driving velocity requirement and reduce the overflow loss.
Research on Advance Control of Chaotic Vibration Mill with High Vibration Intensity - Base on PLC Experimental Analysis
Authors: Yang Xiao Lan , Liu Ji Feng , Jia Min Ping , Zou Jing Chao , Xv Fang Min
Published: March 2013

Some special operations of chaotic vibration mill require not only has a certain frequency high vibration intensity but also can effectively control overtime and over-limited of vibration intensity. The validity of advanced control decision is key technology for chaotic vibration mill to achieve some special operations such as super-hard and superfine grinding. Through the application based on the intelligent frequency conversion of PLC advanced control system, the high vibration intensity exceeds 15 presents discontinuously and the transient super-high vibration intensity exceeds 20 presents 3 times shortly. By comparing with conventional vibration mill, it shows that the advance control system can control high vibration intensity effectively, and the engineering effects of the deaggregation and refinement of super-hard and superfine grinding is obtained.
The Synchronization of a Fractional-Order Chaotic System
Authors: Zhang Fan Di
Published: March 2013

In this paper, the synchronization of fractional-orderchaotic system is studied. Based on the fractional stability theory, suitable controller is designed to realize the synchronization between fractional-order system and a integer-order system. Numerical simulations show that the effectiveness and feasibility of the controllers .
Research on the Application of Dahlin Algorithm on Position Tracking System
Authors: Zhang Tao
Published: March 2013

The common direct digital control method cannot achieve good results to the position follow-up system which includes pure delay inertial link. On the base of the advantage of Dahlin algorithm processing pure delay inertial link, this paper performed design process and simulation calculations applying Dahlin algorithm to design the position follow-up system. Observing the tracing results, the paper achieves the desired results with its high precision and velocity and proves the application value of Dahlin algorithm.
Control Strategy for Fault-Tolerant Paralleling Active Power Filter
Authors: Peng Jin Jie , Fan Xiao Ping
Published: March 2013

A control strategy for a fault-tolerant paralleling active power filter was proposed. The structure and running models of the fault-tolerant paralleling active power filter were given. When the inverter of APF had fault in some phase, the fault structure of the inverter was analyzed. Its fault-tolerant structure was three-phase four-switch. The bridge composed of two capacitors replaced the fault phase for the inverter based on three-phase four-switch. It was important to stay stable for inverter DC-side. The method to stabilize the DC-side voltage was proposed. The controlling strategy for APF working on both normal state and fault state was proposed. The simulating results showed that harmonic currents were suppressed by the fault-tolerant paralleling APF whether working on normal state or fault state. The DC-side voltage stayed stable and the system has high reliability.
Research on SVPWM Algorithm for Three-Level Based on Active Area Vector Method
Authors: Xiao Gan
Published: March 2013

Three-level is widely applied in the high-power medium-voltage system and in which SVPWM algorithm is the key part. While the three-level algorithm can be simplified into two-level space-vector modulation algorithm based on reference voltage decomposition, it makes the application that active area vector on three-level to be a probability. It breaks the three-level allocation time down into two-level and the inherent relationship between the active area vector and the traditional SVPWM algorithm is analyzed. Non-midline current direction detection method is used in neutral point potential control of active area vector method for three-level. Simulation and experimental results verify the availability of the novel methodology.
Dual-Band BPF Using Simple SIR Structure
Authors: Ko Wen , Her Man Long , Wang Yu Lin , Hsu Ming Wei
Published: March 2013

This paper studies a very simple structure for dual-band bandpass filter. Filter is composed of two asymmetric coupled resonator circuit by two sets of different size stepped impedance resonator. This circuit applied microstrip line, coupling principle and impedance ratio by controlling the stepped impedance resonator to control the center frequency 2.6/5.2 GHz of the first and the second bandpass filter. The basic structure of the filter is constituted by the three sections of transmission line and two sets of SIR, that is, in two gaps of the three sections of transmission line parallel connection the equivalent inductances and capacitor of the two sets of SIR in series with the resonant circuit (LCL) to constitute bandpass filter. The low frequency 2.6 GHz is through the upper half of low impedance SIR, and the high frequency 5.2 GHz is through the lower half of high impedance SIR. This paper presents the design of asymmetric SIR-based dual-band bandpass filter, the filter structure is simple, easy to produce and can control the characteristics of the passband center frequency. By electromagnet simulation software( IE3D ) to simulate, the actual production of the circuit using a vector analyzer measurement, simulation and measurement results show good consistency.
A Hybrid Population-Based Incremental Learning Algorithm for M-Machine Reentrant Permutation Flow-Shop Scheduling
Authors: Li Zuo Cheng , Qian Bin , Hu Rong , Zhu Xiao Hong
Published: March 2013

In this paper, a hybrid population-based incremental learning algorithm (HPBIL) is proposed for solving the m-machine reentrant permutation flow-shop scheduling problem (MRPFSSP). The objective function is to minimize the maximum completion time (i.e., makespan). In HPBIL, the PBIL with a proposed Insert-based mutation is used to perform global exploration, and an Interchange-based neighborhood search with first move strategy is designed to enhance the local exploitation ability. Computational experiments and comparisons demonstrate the effectiveness of the proposed HPBIL.
Analysis and Construction of Automobile Steering Gear Model Library Based on CATIA
Authors: Xu Wan Hong , Wang Guo Ying , Ma Wen Xuan
Published: March 2013

Automobile steering devices are key parts that change driving direction of automobiles and maintain them stable in a straight line. In order to construct steering gear model quickly and accurately, this paper does parameterized modeling to automobile steering gear through knowledge engineering module of CATIA software. By using Visual Basic can be interactive interface created, modeling can be recorded and modified procedure through the macro mode, and write program code, by using process of external access to realize secondary development of CATIA and complete construction of steering gear model library. Users input corresponding design parameter values that can automatically call parts model; therefore, it shortens product design cycle and improves design efficiency of product.
An Expert System for Aided Design of Rice Transplanter Chassis Systems
Authors: Jin Xiao Ping , Wang Xue Liang , Mao En Rong , Song Zheng He
Published: March 2013

The paper presents a structure and functions of an expert system for aided design of rice harvester chassis systems. It was developed on basis of a detailed analysis of the design process, including knowledge bases regarding chassis systems automated design, a community of parameterized parts and assemblies and interference engine. In the creation of the system, Visual C++, Pro/Engineering and Oracle database were used. This system is characterized by a rule-oriented representation of knowledge, forward chaining inference methods, and graphic representation of the design results by parameterized technology. The industrial application of this system proved its high reliability and accuracy.
Research on the Expert System for Sweet Corn Standard Production Based on Heterologous Data Integration Technology
Authors: Peng Lin , Zheng Qiang , Liu Zhao Rong
Published: March 2013

To better share agricultural information in existed agricultural informatization condition, and to meet agro-departments new needs about local self-governed and global shared data management during standardized production of the sweet corn, this paper provides a method of integrated sharing of heterogeneous data sources to apply to standardized product of the sweet corn. This method solves the data integration and sharing problems during standardized production of the sweet corn. In this paper, the expert system for sweet corn standard production which is ability to combine heterogeneous data is constructed. This system is proved to be reliable, perform well and it is easy to operate.
Research on the Ontology Knowledge Base Yunnan of Seed Plants Endemic Genera
Authors: Peng Lin , Liu Zhao Rong , Zheng Qiang
Published: March 2013

Yunnan province has rich natural resources with high species diversities because of its unique ecological environments, while the abundance of genera of seed plants endemic in Yunnan ranked the top one in China. But there are several shortcomings influence the research and the protection on genera of seed plants endemic in Yunnan. Firstly, the storage of relevant knowledge and data of genera of seed plants endemic in Yunnan is dispersion; secondly, the structure of the data system is poor; thirdly, the format and standard database is not unified. In order to improve the above shortcomings, this paper will built an ontology knowledge database for Yunnan genera of seed plants endemic based on ontology, geography ontology and ontology integration technologies. This new ontology knowledge database will apply new technologies and theoretical basis for the further macroscopic research on Yunnan genera of seed plants endemic. And it will apply scientific decision and research methods for optimization adjustment on distribution of genera of seed plants endemic in Yunnan.
Data Transmission Mechanism Supporting Fairness and QoS in Wireless Sensor Networks
Authors: Kim Seong Cheol
Published: March 2013

In this paper we propose a data transmission mechanism that supports fairness and Quality of Service (QoS) in a wireless sensor networks (WSNs). In this mechanism the received or measured data traffics will be assigned a priority level according to its transmission urgency. And the load prediction algorithm is used to support the fairness between different priority traffics. For this, the buffer length values of the nodes are continuously monitored for some period. Based on the buffer length variations for this period, the order of transmission is determined. FQSM also adapts cross-layer concept to rearrange the data transmission order in each sensor node's buffer, saves energy consumption by allowing few nodes in data transmission, and prolongs the network lifetime
Membrane Computing Model Design with Quantum-Inspired Evolutionary Algorithms
Authors: Rong Hai Na , Huang Xiao Li
Published: March 2013

As a branch of natural computing, membrane computing has attracted much attention in various disciplines. But the programmability of membrane computing models is an ongoing and challenging issue in this area. This paper develops the automatic design of membrane computing models through predefining the membrane structure and initial objects and introducing a modified quantum-inspired evolutionary algorithm with a local disturbance to select an appropriate subset from a redundant evolution rule set. The main idea of the presented method is that multiple membrane computing models, instead of only one model like in the literature, can be designed by applying one redundant evolution rule set. The effectiveness of the design method is verified by the experiments.
The Standardization of Folksonomy Based on Ontology Technology
Authors: Wang Xin Yuan , Cui Jin Dong
Published: March 2013

The folksonomy compared with the traditional classification and thematic approach, is a completely spontaneous by the user, which using natural language, uncontrolled information organization, easier to be accepted by public users. But on the one hand, the folksonomy due to the elimination of the strict vocabulary control and hierarchical structure has too many faults, such as fuzzy semantic retrieval accuracy and low recall rate, as well as tag the abuse of information garbage. In this paper, the author uses the ontology to standardize the folksonomy, and try to improve the effect of folksonomy for information organization and retrieval.
Intact Loess Structural Loss Parameter in Humidification Process
Authors: Chen Xi , Chen Bin Bin
Published: March 2013

Based on soil structural view, the mechanism of loess structure is analyzed in humidification process. The concept of the loess structure loss is proposed.And quantitatively parameter described the loess structure loss is set up, that is structure loss parameter. And then the influence laws of humidification and loading on loess structure loss are discussed. The results show that structure loss parameters is increasing with the increase of the humidification water content. The moistening collapsibility has a good linear relationship with loess structure loss parameters.