bluuebunny/crossref_metadata_2025 huggingface dataset:
A Thermometric Analysis for an Explosion Accident in a Nitromethane Rectification Process
Authors: Zhang Bo , Xin Qian Qian , Jia Shuang Ming
Published: December 2012

The chemical plays an important role in fire or explosion accidents during the chemical process. It is of great significance to study thermal explosion risks of chemicals through thermometric analysis. There are usually two parameters most widely used to determine the thermal stability, TD24 and SADT, to judge whether chemicals will explode under such reaction conditions. This article chooses thermometric analysis method to investigate an explosion accident in a process of nitromethane rectification. It is an effective way to analyze the accident causes from the angle of thermal stability. Samples including crude product, 99% product and raffinate have been collected from the accident site, with which three thermometric analysis experiments have been performed. Through these experiments, heat releasing curves of samples at different heating rates were measured, offering essential data for calculating TD24 and SADT. These results are able to help conclude what contributes most to this accident and what are the probable causes, as well as providing scientific support for how to prevent explosion in consideration of the thermal stability.
Developing of a Lubricant Oil for the Ship Gas Turbine of Reducer
Authors: Huang Fu Chuan , Tang Xing Zhong , Su Man Rong , Lu Zhao Xia , Xiao You Cheng , Li Sheng
Published: December 2012

The combination of ship gas turbine working at special environment, this article pass through the study of base oil and composite additive, developed an application marine environment of the ship gas turbine reducer lubricants. According to comprehensive performance assessment, the product has excellent high-temperature anti-oxidant, anti-wear, corrosion inhibition and anti-foam performance. The indicators have reached the requirements. With the development of China's ship gas turbine technology, especially UGT25000 ship gas turbine technology is imported from Ukraine, as well as the recent introduction of the GE LM2500 + G4 Series of technology for power plant of construction. The localization of the supporting facilities are growing louder, there is a strong market rigid demand. Ship gas turbine must be one of the trends of the development of Marine Power. Ship gas turbine due to light weight, small size, stand-alone power, fast start; less pollution, vibration, high thermal efficiency and gas initial temperature, it is easy to realize the cascade of energy use, economy, received widespread attention and application. China's ship gas turbine of modification and design draw the aero-engine, ship gas turbine is a continuous rotation of the impeller mechanical heat engine; it is mainly composed by three parts of the compressor, gas generator and gas turbine. Ships generally use diesel (fuel have heavy trend, the heavy diesel oil or No. 200 heavy oil will be used) as fuel, in order to adapt the ship gas turbine, ship gas turbine need to transform, particularly its' lubrication system [1]. Foreign aviation gas engine lubricants are based on the U.S. standard as a reference, due to the differences of using purpose and fuel, so that the ship gas turbine oil has different requirements. Since ship gas Turbine Technology started late in China, the ship gas turbine core engine technology patents come from the United States, Russia and Ukraine, so the use of gas turbine lubricants, as well as matching accessories and other standards, which are more or less directed reference to refer to the original foreign standards [2,3]. We have never been established using standard ship gas turbine oil. Ship gas turbine apply to the special conditions (high humidity, salt spray, etc.), the ship gas turbine of lubrication has a higher demand, particularly for the ship gas turbine reducer of lubrication. The ship gas turbine reducer work in the low-speed heavy-duty and high-speed heavy-duty , high strength, high shear conditions, how ensure the ship gas turbine reducer to normal work is very important at high load conditions. In this regard, developing of a ship gas turbine reducer lubricant is very necessary.
Study of Culture Paper Making with P-RC APMP by Different Papermaking Process
Authors: Lin Tao , Song Jian Wei , Yin Xue Feng , Wang Zhi Jie
Published: December 2012

Using Poplar P-RC APMP as raw materials for culture paper making, the effect of conventional papermaking process and P-RC APMP fines-calcium carbonate co-flocculation process on the P-RC APMP culture paper properties were studied. The result showed that, comparing to the conventional papermaking process, co-flocculation process can supply paper with better strength properties, bulk and whiteness. When precipitated calcium carbonate (PCC) or ground calcium carbonate (GCC) were added respectively in conventional papermaking process, the PCC supplied handsheets with better bulk and whiteness, while GCC supplied handsheets with better strength properties. In the co-flocculation process, the effects of PCC and GCC were nearly the same in strength properties and bulk of handsheets, but PCC was more beneficial for whiteness. SEM images showed that PCC distributed more evenly in the fiber network, and well-bonded with fiber network. The particle size of GCC is relatively small, mainly filled in the fiber network and wrapped on the fiber.
Laccase-Catalyzed Coloration of Silk with Tea Polyphenols
Authors: Sun Sha Sha , Tang Ren Cheng
Published: December 2012

A new concept of enzymatic coloration of silk fiber with tea polyphenols (TP) in the presence of Rhus vernicifera Laccase was proposed in this study. Three methods were investigated: the simultaneous enzymatic polymerization of TP and coloration of silk, the polymerization of TP with laccase followed by a further coloration of silk, and the adsorption of TP by silk followed by laccase treatment. All the methods, especially the first two methods can increase the color depth of silk and improve the color fastness. The color depth of silk increases with the dyeing time and the laccase concentration up to 4 U/mL at pH 5.0 and 50oC.
Study on the Adsorption and Regeneration of Chloroacetic Acid on Polyacrylamide Bentonite Composite
Authors: Chen Xue Qing , Cao Ji Lin , Feng Tian Shui , You Xin Ling
Published: December 2012

Aiming at the removal of chlorinated disinfection by-products in water and the difficulty of separation of powder bentonite from water, the polyacrylamide bentonite composite was prepared and used as absorbent. The mechanism of adsorption and regeneration was discussed. The adsorption of chloroacetic acid on polyacrylamide bentonite composite followed Langmuir isothermal and Pseudo second order kinetic equation, and the adsorption capacity was 63.01mg/g at optimal temperature 30°C. The sorption heat were at the range of 9~16kJ/mol and decreased with the increase of temperature. It was indicated the adsorption mainly belonged to chemical adsorption, and the proportion of physical adsorption increased with the temperature increase. The thermodynamic parameters were ΔH0=-5.226kJ/mol, ΔG0=-27.753kJ/mol. These showed the adsorption was spontaneous and exothermal process. The composites were characterized by XRD and FT-IR. It was found the acrylamide intercalated in interlayer of bentonite and polymerized, then interacted with bentonite by hydrogen bonds. The d001 increased and decreased with adsorption and regeneration, the chloroacetic acid was considered to intercalate in the interlayer of polyacrylamide bentonite composite. The hydrogen bonds may exist between chloroacetic acid and CH2 groups. The polyacrylamide bentonite composite adsorbed chloroacetic acid could be regenerated by NaOH solution.
The Research of Second Acid Fracturing Temporary Plugging Agent in Long Interval Gas Well of Puguang
Authors: Zhou Cheng Yu , Wang Dong , Liu Hong , Xiong Wei
Published: December 2012

On the basis of physical truth of long Interval gas well in Puguang, it proposes a technology for adding temporary plugging agent in the second acid fracturing fluid. The CKHG-1 system and polyester fibre solid intensifier have been synthetized and taken infrared spectroscopic analysis. A series of experiments have been done such as density, molecular weight, differential scanning calorimetry, scanning electron microscopy, acid soluble rate and core flowing experiment. The results were obtained through tests, including temporary plugging agent density of 1.2297 g/ml, average molecular weight of 1.27×105, glass-transition temperature of 61°C, temporary plugging particles covering fixed effect was ideal, acid soluble rate after four hours of 95%, temporary plugging rate >99%. They can meet actual conditions in worksite.
Effect of Steam Treatment on Catalytic Performance of La2O3-HZSM-5 for Methylation of Toluene with Methanol
Authors: Li Jun Hui , Hu Zhong Hua , Wang Ya Nan , Xiang Hao , Zhu Zhi Rong
Published: December 2012

Methylation of toluene with methanol to synthesize p-Xylene was performed in a fixed-bed reactor. HZSM-5 zeolite as a catalyst was prepared by modification with La2O3. In addition, effect of steam treatment for La2O3-modified HZSM-5 on its catalytic performance was investigated as well. The properties of as-prepared catalysts were characterized by XRD, BET and NH3-TPD. The results indicate that modification with La2O3can narrow the size of HZSM-5 channel effectively. And more than 90% selectivity of p-Xylene is obtained over HZSM-5 with loading of 24% and 30% La2O3. However, above La2O3-modified HZSM-5 with high-selectivity exhibit a poor stability for time on-stream of the methylation reaction. Steam treatment of La2O3-modified HZSM-5 can improve its stability and shape selectivity, decreasing by-products. These effects can be attributed to distortion & narrowing of HZSM-5 channel and reduction of HZSM-5 strong Bronsted acid sites during steam treatment. As a result, the excellent catalytic performance is obtained over 24.0% La2O3-modified HZSM-5 by steam treatment at 773 K for 1.0 h, being 23% conversion of toluene, 93% selectivity of p-Xylene during time on-stream.
Effect of Crosslink on Properties of Thermoplastics Dialdehyde Sweet Potato Starch
Authors: Zhang Shui Dong , Zhang Yu Rong , Wang Yu Zhong , Wang Xiu Li
Published: December 2012

In this study, Dialdehyde sweet potato starch (DASS) with various carbonyl contents had been prepared by sodium periodate in the neutral condition and applied to improve the comprehensive properties of thermoplastic starch. Thermoplastic dialdehyde sweet potato starches (TPDASS) was prepared by thermal press when glycerol was added as a plasticizer. The thermal properties, moisture adsorption, mechanical and biodegradable properties of TPDASS were investigated. The results illustrated that at higher carbonyl content, the moisture adsorption and biodegradable ratio decreased with the increasing Tg of TPDASS, which may attribute to the partial cross-linking of DASS. The highlight properties of TPDASS95 were that: its tensile strength could reach 12.9 MPa even water content was 13.5%.
Characterization of Nano Ni/MgO-ZrO2 Catalysts
Authors: Yang Min , Han Dian Jun , Li Guo Fu , Ning Bo , Cui Hong Tao
Published: December 2012

Catalysts of Ni/MgO-ZrO2 were synthesized by the impregnation method and co-precipitation. They were characterized by X-ray diffraction (XRD), Scanning electron microcopy (SEM). It was observed that the monoclinic ZrO2 turned to tetragonal ZrO2 with the Mg2+ mixed. The tetragonal phase ZrO2 is considered as the desired phase which exhibits both acidity and basicity, and active in many heterogeneous catalytic systems. The NiO-MgO solid solution is also discovered on the surface of catalysts. Since the formation of carbon deposit needs a certain size of metal Ni, so the solid solution inhibited the reduced state Ni agglomeration .
A New Criterion for Stability Analysis of Tunnel Surrounding Rock-Support Structure Based on the Convergence-Confinement Method
Authors: Kang Yong , Chai Bo Long , Wang Xiao Chuan , Li Deng
Published: December 2012

In the decision making of tunnel excavation and support scheme, stability analysis of surrounding rock-support structure is an essential link. Especially in fractured weak zone under complex geological condition, accurately measuring the deformation of support structure has an important significance for fast and safe construction. Based on the application of convergence confinement principle in judging tunnel deformation, this paper presented a new idea of using the ultimate displacement of tunnel initial support to analyze the stability of tunnel surrounding rock-support structure. Then, with a full investigation on the deformation and failure characteristics of highway tunnel surrounding rock at fractured weak zone, the ultimate displacement was got by using methods of numerical calculation and site monitoring measurement. Finally, the stability analysis of support structure in Zhongxing Tunnel was done. It can be arrived that there is a certain gap between true value u and measured value um of surrounding rock deformation. If the measuring points are installed after three excavation cycle, u is approximately equal to 1.6 um. then, based on the analysis of numerical simulation results and monitoring data of Zhongxing Tunnel, the paper indicated that the top and spring of arch are risk regions, reserved deformation of fractured weak zone is not enough, it should be adjusted from 10cm to 20cm.
Progress of Filling Layer of Self-Compacting Concrete in CRTS-III Type Track System
Authors: Cheng Jian Qiang , Zeng Xiao Hui , Yang Yan Ke , Gu Hai Peng
Published: December 2012

In this paper,the functions and performances of filling layer of self-compacting concrete(SCC) in CRTS(China Railway Track System)-Ⅲ type track system were introduced. Developments of SCC including design methods and test method was described in detail. The influencing factors of workability of SCC was analysised. The trends of future development of mix proportion design methods,durability evaluation admixtures,applications were discussed.This paper also pointed that it's importance for SCC to studying the quality control methods and the application.
Theoretical Study on Recombination Efficiency at S-DPVBi/Alq3 Interface in OLED
Authors: Hwang Young Wook , Kim Kwang Sik , Won Tae Young
Published: December 2012

In this paper, we report our numerical study on the electrical-optical properties of the organic light emitting diodes (OLEDs) devices with n-doped layer, which is inserted in an effort to reduce the interface barrier between the cathode and the ETL(electron transport layer). In order to anlayze the electrical and optical characteristics such as the transport behavior of carriers, recombination kinetics, and emission property, we undertake the finite element method (FEM) in OLEDs. Our model includes Poisson’s equation, continuity equation to account for behavior of electrons and holes and the exciton continuity/transfer equation to account for recombination of carriers. We employ the multilayer structure that consists of indium tin oxide (ITO); 2, 2’, 7, 7’ –tetrakis (N, N-diphenylamine) - 9, 9’- spirobi-fluorene (S-TAD); 4, 4’- bis (2,2’- diphenylvinyl) - 1,1’- spirobiphenyl (S-DPVBi); tris (8-quinolinolato) aluminium (Alq3); calsium(Ca).
Response Characteristic of Internal Surface of Phase Change Wall on Outdoor Temperature Changes
Authors: Yan Quan Ying , Jin Li Li , Yue Li Hang , Ruan Zheng Bang
Published: December 2012

In the paper, mathematical model of phase change wall prepared by different ways and common wall was built and simulated by ANSYS. Response characteristic of internal surface of phase change material wall on outdoor temperature changes was studied when phase change material was added into the wall by different ways. Results in this paper can provide the basis for the application of the wall with phase change material.
The Surface Electrical and Microstructure Analysis of Peat Treated with Cement
Authors: Moayedi H. , Kazemian S. , Vakili A.H.
Published: December 2012

Peat usually undergo large secondary settlements depending on the amount of organic content present in the soil. This is because of its special microstructure. The microstructure of peat has interdependence with mechanical and physical characteristics, such as compressive and tensile strength, and water retention. In the present research, peat samples were admixed with different concentrations of cement to enhance its physical, chemical, electrical, and microstructural properties. As a result, the surface electrical of the peat colloids influence the rate of flocculation, and in turn further strength achievement. The results is in contrary with the microstructural analysis that performed by SEM and EDX on the treated peat.
The Vibration of Spur Gear Pair with Strong Nonlinear Suspension
Authors: Wang Xiao Sun , Wu Shi Jing , Hu Ji Cai , Peng Ze Ming
Published: December 2012

In this paper, the pure rotational dynamic model of one stage gear pair system is developed and the nonlinear factors, such as strong nonlinear suspension, time-varying mesh stiffness, piece-wise backlash and internal error excitation, are included in our model. The relative mesh displacement is employed to convert the semi-define system with rigid displacement model into a define one. Such qualitative and quantitative methods as the bifurcation diagram, Lyapunov exponents, Poincaré section, phase trajectory, power spectrum and time history curve are utilized in present research to illustrate the nonlinear dynamic behavior of the system. The sub-harmonic response, chaotic response and the route to chaos of the system are revealed based on one applicable numerical integration method.
Chaos and Bifurcation Analysis of Gear Pair with Wear Fault
Authors: Wang Xiao Sun , Wu Shi Jing , Hu Ji Cai , Chen Jie
Published: December 2012

The spur gear pair’s nonlinear equation of motion including piece-wise backlash and internal error excitation is derived in this research. The worn tooth effect in time-varying mesh stiffness is introduced to do in-depth investigation of the dynamic traits for gear transmission system with wear fault. The internal excitation frequency is selected as a criterion to calculate the bifurcation diagram and the corresponding Lyapunov exponents. Some auxiliary analyzing meanings such as Poincaré maps, phase trajectory, power spectrum and time history curve are utilized to illustrate the system’s nonlinear behaviors with special parameter settings. Different routes to chaos and abundant nonlinear phenomena have been observed in this nonlinear gear transmission system.
Studies on Improved Silicon Module for Concentration Photovoltaic System
Authors: Liu Jing Jing , Fan Yang
Published: December 2012

This paper presents the experimental study of an improved PV solar module based on an outdoor point-focus two-axis tracking reflective concentration photovoltaic system in Nanjing. The special improved silicon solar cell was utilized to fabricate the module. Relationship between the concentration ratio and maximum power of the module was illustrated. The results showed that the electricity output was improved by enlarging the illumination on the solar cell through increasing the number of flat-glass mirrors. The optimum performance of concentration photovoltaic system was obtained with 18 mirrors. Nonideal module design and cooling approach may result in the deterioration of silicon module efficiency for higher concentration ratio application.
Calculation on the Residual Stresses of Injection-Molded Conductive-Carbon-Fiber-Filled Polymer Composites
Authors: Jiang Ai Yun , Zou Jing Chao , Zhang Bao Feng , Wu Hai Hong
Published: December 2012

For conductive-carbon-fiber-filled polymer composites, the residual stresses developed during injection molding process may affect not only the molding’s conductive property, but its dimensional stability as well. In order to improve the conductivity of the molding fabricated with this kind of composites, we investigated, using layer removal method, the distribution of the residual stresses of injection-molded conductive-carbon-fiber-filled polypropylene in this paper. The residual stresses were obtained under the actions of different processing conditions. Our results indicate that processing pressures have more significant effects on the residual stresses at the skin areas than the core areas of the sample because of fiber orientation. The tensile stresses of the molding at the core areas drop under the action of packing pressure, but the compressive stresses at the skin areas increase. The results reveal that the action of packing pressure may decrease the anisotropy of the residual stresses in the molding.
Numerical Analysis of Active Cooling Structure of Engine Combustion Chamber
Authors: Zhang Y.G. , Bai Y.G. , Yu X.C. , Liu Y.F.
Published: December 2012

With the convective heat transfer theory, numerical analysis of fluid-solid-heat coupling is implemented for the engine combustion chamber cooling structure based on finite element method and computational fluid dynamic method, thus to obtain valuable simulation results. Different components of the mesh generation method used which have different influences on the computational results are thought over during this analysis process, including different grid type, grid density and boundary layer meshes. Moreover, MPI parallel technique is also used to resolve the computation demands. The temperature distributions of the key parts in the cooling structure are investigated, which can be used as a significant reference for the thermal protection design of the engine combustion chamber.
Effect of Injection Molding Parameters on Residual Stress of Plastic Drawing Board
Authors: Jiang Lan Fang , Liu Hong , Hu Chang Guo , Chen Xian Li , Lei Zhi Jiang
Published: December 2012

Due to large planar scale and small lateral scale of plastic drawing board, it was easy to cause warpage problem in injection molding. Optimization of injection molding process was taken to reduce residual stress and improve quality. Combining orthogonal experimental method and software Moldflow, analyzed the effect of mold temperature, melt temperature, hold pressure and injection velocity on warpage deformation. It changed multi-objective optimization to single-objective optimization by weighted method. Through range analysis obtained the influence trend between parameters and comprehensive optimal object. Lastly got the optimal combination of injection molding process parameters.
Couple Model for Predicting Behaviors of Underwater Towed Systems under Effect of Heave and Pitch Motion of Ship
Authors: Yuan Zhi Jiang , Jin Lian Gan , Chi Wei , Tian Heng Dou
Published: December 2012

Underwater towed systems have the many applications in exploitation of underwater environments. While in the research exists which is about the numerical models of towed system, the relatively simple model of the towed body is used and the dynamic of the towing ship is neglected. The towing ship as part of towed system, its heave and pitch motion are coupled and highly non-linear. Considering the dynamic of three parts of towed system is important. In the paper, a newly couple model is developed to predict the behaviors of underwater towed systems under effect of the heave and pitch motion of towing ship. We use a finite difference method as the towed cable and is coupled with the non-linear numerical models of a towing ship and a towed body. Illustrative application of the coupling model is presented. The numerical results show the heave and pitch motion of towing ship affect the motion of towed body.
Rigid-Elastic Coupled Dynamics and its Application
Authors: Song Hai Yan , Liang Li Fu , Li Hai Bo
Published: December 2012

According to energy conservation law, the functional of quasi-variational principle of rigid-elastic coupled dynamics is established. Quasi-stationary value conditions of quasi-variational principle of rigid-elastic coupled dynamics are derived. The governing equations of rigid-elastic coupled dynamics are obtained. As an application of rigid-elastic coupled dynamics, an approach of coupled vibration mode determined of unrestrained beam is established. The coupled vibration mode and coupled frequency are studied by the approach.
Preparation of Electrospun Poly(ε-caprolactone)/Poly(trimethylene carbonate) Blend Scaffold for In Situ Vascular Tissue Engineering
Authors: Jiang Tao , Zhang Guo Quan , Li Hui , Xun Ji Na
Published: December 2012

In the active field of vascular graft research, in situ vascular tissue engineering is a novel concept. This approach aims to use biodegradable synthetic materials. After implantation, the synthetic material progressively degrades and should be replaced by autologous cells. Poly (ε-caprolactone) (PCL) is often used for vascular graft because of its good mechanical strength and its biocompatibility. It is easily processed into micro and nano-fibers by electrospinning to form a porous, cell-friendly scaffold. However, the degradation time of polycaprolactone is too long to match the tissue regeneration time. In this study, poly (ε-caprolactone) /poly (trimethylene carbonate) (PTMC) blend scaffold materials have been prepared for biodegradable vascular graft using an electrospinning process. Because the degradation time of PTMC is shorter than PCL in vivo. The morphological characters of PCL/PTMC blend scaffold materials were investigated by scanning electron microscope (SEM). The molecular components and some physical characteristics of the blend scaffold materials were tested by FT-IR and DSC analysis.
Some Aspects over Thixotropic Fluid Behavior
Authors: de Deus Hilbeth P. Azikri , Dupim Guilherme S. Paez , da Silva Claudio R. Avila
Published: December 2012

In this work some theoretical aspects of constitutive equations for thixotropic fluids and restrictions on their functional forms are formally discussed. In the current study a formal emphasis has been given to the structural nature of this substances. The behavior of thixotropic fluids is analyzed in terms of simple isothermal laminar shear flow.
Tilted Bulk Disordered Distribution Cosmological Model
Authors: Bagora Anita , Purohit Rakeshwar
Published: December 2012

Bianchi type I bulk viscous fluid tilted cosmological model filled with disordered radiation and heat conduction is investigated. We assume that (constant), where is the coefficient of bulk viscosity and  is the expansion in the model. Here, we assume a linear relation between shear and expansion i.e. =constant, which leads to A=BC, where A, B, C are metric potentials. The physical and geometrical aspects of the model in the presence and absence of bulk viscosity are also discussed.
Improved MoM-PO-Based Technique for Wideband Analysis of Antennas around Large Platforms
Authors: Ma Ji , Gong Shu Xi , Wang Qian
Published: December 2012

An improved wide-band analysis which combines the hybrid method of moments-physical optics (MoM-PO) formula with impedance matrix interpolation technique for antennas around large platforms is presented. The algorithm proposed in this paper interpolated the mutual impedance matrix between MoM and PO regions rather than the MoM self-matrix. This practice can result in more accurate frequency response than the conventional approach. Sample numerical results demonstrate the capability of the algorithm.
Modeling and Active Control of Circular Electrostatic Torsional Micromirror
Authors: Bai Cheng , Huang Jin
Published: December 2012

Three main obstacles in modeling electrostatic torsional micromirror are hard to calculate – damping coefficient, mechanical spring constant and electrostatic torsion accurately. Because that parameter variations and model uncertainty of the torsional micromirror resulting from fabrication imperfections are inevitable, it is another problem to seek a control scheme for achieving accurate positioning and trajectory tracking of an electrostatic torsional micromirror. In this paper, aimed at a real prototype of circular electrostatic torsional micromirrorr, both static and dynamic behaviors are modeled and studied. A novel nonlinear Proportional, Integral and Derivative (PID) control are proposed in succession. Simulation results show that the system model derived is more accurate to the micromirror and the nonlinear PID can eliminate the static deviation.
Based on Serial Port Class Implements of SCM and PC Serial Communication Program Design
Authors: Yang Yun , Zhu Yue
Published: December 2012

In this article, Using the latest Visual studio.net 2005 supplied C # serial class implements PC and single-chip microcomputer of serial communication. Summarizes the card the integrated function of the integrated management system, and probes into how to use C# serial kind of design for serial communication program, through the C# serial class in one card the specific application of integrated management system, and analyzes the application of C# serial kind characteristics, proved the C# serial class can make serial communication program design flexibility, can improve the reliability of the data in the serial port transmission. The actual operation shows that this kind of programming method is stable, reliable and practical.
A New Design of Ultrasonic Power Based on ARM
Authors: Yao Zhen , Guo Zhong Ning , Zhang Yong Jun
Published: December 2012

An ultrasonic power for rotary machining is introduced based on ARM. Its frequency tracking principle is analyzed. The improved accurate frequency tracking method using a phase lock loops (PLL) is presented. The control circuit based on ARM is designed and the presentation of system program flow chart is given. The experimental result proved that the ultrasonic power system can realize quick and accurate frequency tracking. Ihe power can work well with constant amplitude control.
Study of Transducer Installation Effects on Ultrasonic Flow Metering Using Computational Fluid Dynamics
Authors: Wang B. , Cui Y. , Liu W. , Luo X.
Published: December 2012

In ultrasonic flow metering, the inner pipe wall will be distorted by transducer’s installation, and the velocity profile of the meter will be different from that in a long straight pipe located in front of or behind the meter section. Changes in profile will finally influence the flow measurement accuracy. This paper shows a multi-path ultrasonic flow meter with its transducers installed at different positions. Our purpose is to find the best transducer installation position and to study the influence of path numbers and pipe diameters on the flow measurement accuracy at the best installation position. With a computational fluid dynamics (CFD) analysis, velocity profiles are calculated. Negative bias errors are obtained at all the three of the common installation positions. Similar phenomenon has also been observed in a real field experiment. The reasons for the negative bias error have also been analyzed.
Method for Modeling Ultrasonic Driving Circuit and Designing Matching Network
Authors: Wang Bo Xiong , Liu Wen Feng , Liu Jian Nan , Cui Yuan Yuan , Luo Xiu Zhia
Published: December 2012

The performances of ultrasonic testing systems are greatly affected by the impedance characteristics of ultrasonic transducers. Conventional methods for designing matching networks consider only the characteristics of matching elements and transducer, while ignoring the effects of other elements of emission circuit. As a consequence, such method cannot give out satisfactory results. In this paper, a modeling method for ultrasonic driving circuits is proposed, which takes into account the power supply, the transformer, the matching networks, as well as the ultrasonic transducer. This method focuses on the performances both in time domain and in frequency domain. A computer simulation and experiments show that this method can provide better attenuation characteristics and energy transmission, and can be widely used for analyzing and designing matching network for ultrasonic testing systems.
Design of Data Acquisition System Based on DSP and Optical Fiber Bundle
Authors: Wan Xiong , Yao Dong Gang , Zhang Zhi Min , Zhang Hua Ming , Xiao Wen Bo
Published: December 2012

This paper introduces the design of a DSP-based acquisition system with high parallelism of the beam. The system uses fiber arrays connected to spatial filters as the detection devices. A TMS320LF2407A DSP is adopted as the primary embedded processor, which connects Analog to Digital (A/D) converters via I/O ports. Simultaneously, the processor realizes the parallel processing of data storage, transmission and calculation. The design of the main processor control module, the signal processing module and its corresponding software, are discussed in detail.
Association Rule Mining for Job Shop Scheduling Problem Based on Genetic Algorithm
Authors: Yan Cun Liang , Shi Wei Feng
Published: December 2012

Job shop scheduling problem (JSP) is the most typical scheduling problem, In the process of JSP based on genetic algorithm (GA), large amounts of data will be produced. Mining them to find the useful information is necessary. In this paper dividing, hashing and array (DHA) association rule mining algorithm is used to find the frequent itemsets which contained in the process, and extract the corresponding association rules. Concept hierarchy is used to interpret the rules, and lots of useful rules appeared. It provides a new way for JSP study.
The Friction Coefficient Testing Method of Metallic Sheet and Strip
Authors: Xue Huan , Kuang Nan Xiang , Zhu Hong Chuan
Published: December 2012

The research background and the generation of friction are introduced. The importance of the coefficient of friction test in sheet metal forming field is indicated. Standards of coefficient of friction of metallic sheet and other related materials testing method are described. The experimental principle, the size and preparation of testing sample, testing equipment and procedure, result data processing method are presented.
The Analysis and Optimization of the Reliability of Laminates Based on Probabilistic and Non-Probabilistic Hybrid Model
Authors: Peng Wen Jie , Huang Xiao Xu , Ge Rui
Published: December 2012

The reliability analysis and optimization of laminates containing probabilistic uncertain variables and non-probabilistic bounded uncertain variables is conducted in the present paper. Convex method is utilized to deal with non-probabilistic bounded uncertain variables. The reliability index and index range of a four sides simply supported laminate are optimized for numerical examples. The results indicate that considering the non-probabilistic uncertainty variables can get more conservative results, and the larger the uncertainty range of non-probabilistic bounded uncertain variables is, the more conservative optimization result is.
Complexity Metrics for Assembly Supply Chains: A Comparative Study
Authors: Modrak Vladimir , Marton David
Published: December 2012

In this paper, we study the complexity metrics for systematically generated assembly supply chains structures. We define three structural complexity indicators, such as the index of vertex degree, the supply chain length and the flow complexity. By a comparative study of 190 mathematically selected supply chain networks, we obtained Spearman correlation coefficients among three defined metrics and find some interesting results.
Analysis for Gene Logic Networks of Colon Cancer
Authors: Wang Qing Yun , Cao Sheng Yu
Published: December 2012

This paper took a set of published colon cancer gene expression profiles for example, to show how to establish a gene expression regulation network with logic relationships. The research improved the original algorithm with supported value, then deciphered and confirmed some nonlinear genes functions. This work also provided valuable reference and guidance for biologists to understand and explain some genes function in pathological changes. Gene logic networks have significant meanings for researching gene functions within cells.
An Energy-Efficient Unequal Clustering Algorithm in Wireless Sensor Networks
Authors: Wan Run Ze , Lei Jian Jun , Xu Qing Wei , Gou Xi Mei
Published: December 2012

For wireless sensor networks, clustering algori-thms provides an effective way to prolong the life time using the multi-hop forwarding model. Nevertheless, they rarely consider the hot spots problem and the problem of unbalanced energy consumption among cluster heads. To solve the problems, we proposed an energy-efficient unequal clustering algorithm with the ideal of unequal clustering in the circle area where the cluster heads are in charge of different geographical scope according to different distance to the base station. Considering the cluster heads closer to the BS be burdened with heavy relay traffic, the cluster in inner layers, which is closer to the base station, is smaller than the outer layer. It could reduce the number of cluster members and lead to the proportional energy dissipation in each layer. Simulation results show that our algorithm improve energy utilization and prolonged the life of the entire Wireless Sensor Networks effectively.
A Decision-Making Model for Distribution Center Location during Earthquake Responses
Authors: Tian Wei Dong , Jiang Hai Qiu , Zhou Hong Juan , Guo Dan , Li Wen Bo , Lu Yang
Published: December 2012

Different from the other distribution center location methods, there are new characteristics in distribution center location during earthquake disaster responses. In this paper, we investigate the factors impacting the location of distribution center during earthquake responses, and propose a decision-making model based on improved AHP framework for this issue. The improved AHP is extended to automatically calculate large scale judgment matrices by the crosstie model. This decision-making model was successfully applied in the simulation case of Yushu earthquake responses in 2010. The results show that the proposed decision-making model is reasonable.
Design One Kind of Simplified Smart Home Monitor and Controller Based on ARM-Linux System and Information Network to the Public
Authors: Zhao Zhan Feng , Zhang Yun Tao , Zhou Zhi Quan , Yu Hai Yan
Published: December 2012

A smart home structure using network (internet, intranet, wireless etc.) is designed and developed to monitor the circumstances and control the appliances in the house when sensors are triggered by some unexpected cases. A good host of low-cost sensors is used to make anti theft alarm, fire alarm, smog alarm etc. And then transmitted these data got from the measuring devices to neutral module. The neutral module is constructed by ARM-S3C6410 hardware and embedded Linux. It can transmit messages to the householders after processed. The householders can visit the web server to make it clear what happened in the house. Moreover, they can control some appliances to make incidences back to normal through the Internet. If the owners are holding mobile phones, the neutral module will transmit text messages to them. In turn, they can also control the appliances by sending some specific instructions. And then the neutral module will give some other messages as feedback. Additionally, visible interphone technology also makes function in this system. A LCD is organized in the neutral module, one person who stays in the house can make a good conversation with others through neutral platform. Finally, a series of experiments are posed to estimate the performance of our solution.
On the Precipitation Behavior at 250 and 300 °C of WE54 Supersaturated Solid Solution
Authors: Tighiouaret S. , Azzeddine H. , Sam A. , Sari A. , Alili B. , Bradai D.
Published: December 2012

The current study seeks to further understand the precipitation sequence in a WE54 Mg alloy using in situ X-ray diffraction, micro-hardness and electrical resistivity during ageing at 250 and 300 °C. We show that the mean hardening effect is due to the precipitation of β' and β1metastable phases. The analysis of the kinetics of the precipitation shows that both phases nucleate at grain boundaries and within grains in the form of plates.
The Application of the Case-Based Reasoning Method in the Analysis of Battlespace Command Decision-Making
Authors: Tang Xue Song , Yang Yu , Niu Zhan Jun , Qiao Bo
Published: December 2012

In this paper, we use the case-based reasoning method to build the battlefield and military unit hierarchy reasoning model. The military unit level and multiple military entities at different levels were compared with the case base, said that the characteristic element of the battlefield and military units were collected applied to different levels in the case base , its results are provided automatically for each output and modify. We may construct the evolution model of a battlefield situation for analysis, reasoning and prediction, so as to provide the basis to commanders for decision-making.
Laser Localization of Autonomous Vehicle Using an Improved Particle Filter
Authors: Ying Wen Jian , Sun Fu Chun
Published: December 2012

This article presents an improved Rao-Blackwellized particle filter to overcome particles degeneracy phenomenon and acquire the better localization precision of the autonomous vehicle. The joint posteriori probability density is given that being correlative with the position and pose of the autonomous vehicle and the mark characters of the map. The algorithm utilizes a Markov chain Monte Carlo method with the sampling particle of the target to the resample mechanism of the Rao-Blackwellized particle filter. Simulation results show that the improved algorithm is valid.
Vessel Surface Equipment Attitude Measurement Based on Conventional Inertial Reference System
Authors: Zhang Lei , Wang An Guo
Published: December 2012

Vessel weapon firing precision is deeply influenced by the attitude, which also affects vessel combat efficiency. In order to realize the high precision determination of vessel weapon attitude, this paper presented the weapon attitude measuring theory based on CIRS(Conventional Inertial Reference System). The theory contained star apparent place synchronous calculation, star image coordinates calculation and three-axis attitude solution. It was realized that weapon attitude measurement could be carried out in the sailing, which error was not accumulated. The advantage of this theory is high precision, high reliability and low cost.
Discussion on General Solution of the Laplace Equation for Far Field Electric Potential
Authors: Yu Li Hua
Published: December 2012

In this paper, the general solution of Laplace equation is presented，the electric potential yielded by local electric charge system in remote field is discussed. The result shows that the electric potential yielded can be expressed as the repeated addition of multiple molecules, local electric charge system can be replaced by multiple molecules located at the origin. By comparing the result with the general solution of Laplace equation, the physical meanings of all terms of the general solution are much clearer, the mathematical equation and the physical model are unified.
Creep Behavior of an Industrial Aluminum Drawn Wire
Authors: Diha Abdallah , Boumerzoug Zakaria
Published: December 2012

This paper presents an investigation of the creep behavior of an industrial aluminum drawn wire, where uni-axial tension creep testing was used to characterize the general creep behaviour. This material was crept at different stress with constant temperature. The scanning electronic microscopy and X-ray diffraction were used at different steps of creep test in order to identify the creep mechanism. From this investigation, the effects of applied stress and temperature on thelife time of drawn wires were observed during many tests.
Study on a Nonlinear Oscillator of Elastic String and its Application in Energy Harvesting
Authors: Xie Long Han
Published: December 2012

his paper investigates the nonlinear oscillation of elastic string loaded a concentrated mass in the middle, and vibrating in transverse direction. Through a simple device, free undamped oscillation and forced damped oscillation are studied in detail, which reveals the nonlinear characteristic under oscillation. By tuning the stretch ratio and the initial length of the elastic string, the nonlinear performance can be adjusted in terms of excitation frequencies. This property can be used in energy harvesting from environment vibration, which allows the harvesting device work over a wider range of frequencies and improves the ability of energy harvesting.
A Characteristic Finite Difference Domain Decomposition Substructuring Method for Immiscible Displacement Problems in Three-Dimensional Porous Media
Authors: Li Chang Feng
Published: December 2012

Two-phase immiscible displacement in porous media is described by a coupled nonlinear system of an elliptic equation (for the pressure) and a parabolic equation (for the saturation). For the saturation changes much rapidly than the pressure, a more accurate solution (in both time and space) should be illustrated in practical numerica simulaiton for the former unknown. In this paper we present a seven-point central finite difference scheme to simulate the pressure and a characteristic finite difference combinng with domain decomposition method for the saturation equation. This method consists of reduced two-dimensional computation on the subdomain interface boundaries and fully implicit computation parallelly in subdomains. Aparallel algorithm is outlined and an error estimate in discrete norm is derived by introducing new inner products and norms. At the end of this paper, numerical experiments are presented in order to demonstrate theoretical results and the efficiency.
Collaborative Pricing and Service Level for a Supply Chain
Authors: Chen Liang Tu
Published: December 2012

This study aims at dealing with the collaborative pricing and service level joint decision problem for a supply chain with one supplier and one buyer in a multi-period finite horizon. The study derives analytic solutions under wholesale-price-only and consignment agreements for the decentralized supply chain with shortages allowed and completely backlogged. The analysis shows that the consignment agreement can significantly achieve higher channel-wide profit and service level than the wholesale-price-only agreement.
A Newsvendor Problem with Revenue Sharing in B2B Marketplaces
Authors: Chen Liang Tu
Published: December 2012

This study examines channel performances of business-to-business electronic and traditional marketplaces for newsvendor problems under revenue-sharing contracts. A manufacturer, acting as a leader in the channel, offers a retailer a revenue-sharing contract and wholesale price. The retailer, acting as a follower in the channel, decides the product quantity and retail price. The numerical indicate that the profits of channel, manufacturer and retailer for the vertically decentralized channel in the electronic marketplaces are generally better off than those in the traditional marketplaces.
Study on RP-RS Combined Contract of Three-Level Supply Chain
Authors: Pang Qing Hua
Published: December 2012

The paper studied the coordination of a three-level supply chain made up of one manufacturer, one distributor and one retailer under the random demand. Firstly, the optimal order quantity is determined with the channel coordination of the supply chain; Secondly, the paper designs a combined contract (rebate-penalty contract & revenue-sharing contract, RP-RS) to coordinate the supply chain, namely, manufacturer offers distributor a rebate-penalty contract and distributor offers retailer a revenue-sharing contract. The paper validates that RP-RS contract can coordinate the three-level supply chain by choosing reasonable parameters. The reasonable choice of parameters can attain the win-win good among all business members, which will help to improve the decision-making capacity and competive ability of businesses involved in the supply chain, and the sizes of parameters in a reasonable range relate to the bargaining position of a business.