bluuebunny/crossref_metadata_2025 huggingface dataset:
Microstructural Characteristics of Mg-Zn-Y Alloy Containing Quasicrystal Phase under Pulsed Magnetic Field
Authors: Zhang Lei , Zhou Quan , Luo Kun , Yang Lin
Published: October 2013

A novel pulsed magnetic field (PMF) processing has been employed for refining the microstructure of Mg-Zn-Y (Mg93Zn6Y) alloy in this work. Effect of PMF on the solidified microstructure of Mg93Zn6Y alloy containing icosahedral quasicrystalline phase (I-phase) was investigated. Experimental results show that solidified microstructure of Mg93Zn6Y alloy was significantly refined when the PMF was applied during solidification. I-phase in the entire cross-section of the billet changed from coarse, continuous and nonuniform morphology to uniform, fine and discontinuous morphology. In addition, primary α-Mg was significantly refined and also changed from developed dendrite to fine rosette. It was feasible to use PMF processing to refine the I-phase, because of its strong forced convection within the whole bulk melt.
Study on Leaky Fault Mechanism and Influential Factors of Hydraulic System of Artillery
Authors: Zhou Ren Bin , Liao Xue Bing , Ming An Qing , Zhang Zheng
Published: October 2013

Hydraulic technique is more and more applied in weapon equipments; hydraulic system is becoming one of the important subsystems of modern artillery. In this paper, considering effects of operating pressure, temperature and mixed air rate of hydraulic system, the mathematical model of hydraulic fluid internal leakage rate of artillery is built to analyze leaky fault form and leaky reason. The conclusion shows that the internal leakage rate of the hydraulic system of artillery is depend on temperature, pressure, dynamic viscosity, and bulk modulus and thermal expansion coefficient of hydraulic system. The variation rule of hydraulic fluid internal leakage rate is gotten according to operating parameters. Special reference will be given to leakage detection and location of the hydraulic system of artillery.
Microstructure Changes of Beta Alumina Sintering at Lower Temperature
Authors: Li Hua , Lu Jia Chun , Cheng Guang Yu , Zhu Yang Ni , Jiang Xin Biao
Published: October 2013

Changes in the microstructure and phase content of beta alumina near the lowest possible β-Al2O3 to β-Al2O3 transform temperature were investigated through varying sintering temperature. Obvious microstructure varieties were observed in stabilized β/β alumina specimens following extended sintering treatments. The results show that there is a slightly lower temperature of 1150°C for nanometer precursor powder particles to transform into grains and for β-Al2O3 to convert into β-Al2O3.
Effect Dehydrants to Increasing Molecular Weight of Condensed Polylactic Acid
Authors: Yin Meng Yan , Yang Rong Jie , Li Ding Hua
Published: October 2013

The polylactic acid (PLA) was prepared by direct melt polycondensation using lactic acid aqueous solution as raw material. Considering of the difficulty to rule out small molecules of water, magnesium or magnesium methoxide which could react with water were used as dehydrant and added in the PLA polycondensation, respectively. The determination of moisture, GPC and DSC results showed that both the magnesium and magnesium methoxide are effective in dehydration, the molecular weight of final products PLA is significantly improved and the latter is better. Both of them have a good promoting effect on polycondensation reaction to get a higher molecular weight polylactic acid products. For the time of adding magnesium and magnesium methoxide, it is better to add in the late stage of polycondensation reaction rather than early stage. Furthermore, magnesium has a smaller influence on crystallization of PLA, whereas the crystallinity of PLA is greatly reduced after adding magnesium methoxide.
Simulation Study on Armor-Piercing Effect of Armor-Piercing Bomb
Authors: Zhou Ren Bin , Liao Xue Bing , Ming An Qing , Zhang Yong Feng
Published: October 2013

Studying the armor-piercing effect of armor-piercing bomb that attacks aluminum target is essential, because the target can be considered the simulation of the actual fight equipment. Based on the hypothesis about building the fraction field, the armor-piercing effect of armor-piercing bomb is analyzed, and the velocity and the intruding depth parameter model of armor-piercing effect are established. Taking a certain armor-piercing bomb as example, the intruding processes of armor-piercing effect are simulated by using the nonlinear finite element analysis program LS-DYNA, while aluminum target simulates the wall of combat equipment in two different conditions. At last, the finite element simulated results are given and analyzed that agree with the experiments.
Experimental Research on Mercury-Containing Wastewater by Fly Ash
Authors: Li Yan , Sun Ping
Published: October 2013

To study the removal capacity of modified fly ash in wastewater containing mercury ions under different conditions, the carbide slag was added to fly ash, and the pyrogenic process was employed to modify the fly ash. The result indicated that the wastewater had a pH value of 11, the modified fly ash dosage was 2.0 g, the adsorption equilibrium time was 40 minutes, the reaction temperature was 30 °C, the removal rate could reach 97.1%, and the Freundlich-type adsorption isotherm can be used to simulate the adsorption process effectively. The modified fly ash can be used in the removal of mercury-containing wastewater, the overall result of the experiment is satisfactory, which indicates that the modified fly ash has potential value for practical application.
A New Approach for 3D Edge Extraction by Fusing Point Clouds and Digital Images
Authors: Wang Ying , Ewert Daniel , Schilberg Daniel , Jeschke Sabina
Published: October 2013

Edges are crucial features for object segmentation and classification in both image and point cloud processing. Though many research efforts have been made in edge extraction and enhancement in both areas, their applications are limited respectively owing to their own technical properties. This paper presents a new approach to integrating the edge pixels in the 2D image into boundary data in the 3D point cloud by establishing the mapping relationship between these two types of data to represent the 3D edge features of the object. The 3D edge extraction based on the adoption of Microsoft Kinect as a 3D sensor - involves the following three steps: first, the generation of a range image from the point cloud of the object, second the edge extraction in the range image and edge extraction in the digital image, and finally edge data integration by referring to the correspondence map between point cloud data and image pixels.
The Simulated Annealing Algorithm Based on Multi-Populations Application of TSP
Authors: Gong Qin Hui
Published: October 2013

Traveling salesman problem (TSP) is not only a combinatorial optimization problem but also a classical NP problem, which has has high application value. Simulated annealing algorithm is especially effective for solving TSP problems. Based on the deficiency of simulated annealing algorithm on avoiding local minima, this paper has improved the traditional simulated annealing algorithm, proposed simulated annealing algorithm of multiple populations to solve the classical TSP problem. This algorithm has introduced collateral mechanism of multiple populations and increased the initial populations so that it can include more solution set, avoid local minima, thus it has improved the optimization efficiency.This algorithm has very high use value in solving the TSP problem.
Keywords: Traveling salesman problem, NP (Non-deterministic Polynomial) problem, simulated annealing algorithm, multiple populations
Calculation of Angular Variation of Spacecraft Assembly Considering Measurement Uncertainty
Authors: Yang Jing Zhao , Li Guo Xi , Wu Bao Zhong
Published: October 2013

The present studies of assembly accuracy predicting for complex products are mainly oriented to the early design stage. The final product assembly accuracy is computed using a variation propagation model, which is constructed based on design tolerance model and assembly model. Generally, the solving results are quite different with the actual values. In this paper, the axis angular variation calculation of the spacecraft cabin at the assembly phase was studied. And a novel analysis method for assembly variation was proposed with the consideration of measurement uncertainty of the key characteristics. An example was studied to illustrate and demonstrate the feasibility of the proposed method.
Research on Application of Extended Mean-Shift Algorithm in Image Smoothing
Authors: Zhu De Li
Published: October 2013

This paper studied a method which can extend Mean-Shift algorithm based on Kernel. We describe its basic idea, given the specific steps of the algorithm. And given the application of extended Mean-Shift algorithm in the area of image smoothing. The research also show that extended Mean-Shift algorithm has displayed strong vitality in image segmentation and real-time object tracking.
Design of SCR Control Software Based on Dual-Core Processor
Authors: Li Jie Hui , Yu Qing , Zhang Lu Yun , Huang Tie Nan
Published: October 2013

This paper introduces the control software of SCR system based on the dual-core processor S12XEP100. By the reasonable coordination between the host processor and the coprocessor XGATE, the SCR control system satisfies the increasing demands for real-time. Control performance tests show that the control software of SCR system meets the basic control requirements, also improves the real-time performance of programs effectively, such as urea injection frequency, urea injection quantity and the stability of common rail pipe pressure.
Frequency-Dependent Transmission Line Fractional Model and its Solution Based on Skin Effect
Authors: Guo Jing , Liang Gui Shu , Liu Xin
Published: October 2013

Due to the continuous increasing of operating frequency in the power system and the transmission speed, under the high frequencies of the transmission line calculation and simulation process, it is necessary to consider the frequency-dependent properties. At present, the frequency-dependent transmission line modeling has a variety of methods, but in the modeling and calculation of frequency variable term, processing is relatively complicated. This article will introduce transmission line equation of fractional calculus, intuitive representation of frequency varying parameters, and by a time-domain fractional solution, simplify the operation, improve the computational efficiency. Application of this algorithm for fractional differential equations can be obtained the voltage and current responses at any point in the transmission line. Thesis also by comparison with actual example, confirmed the validity and feasibility of the algorithm. At the same time, proposed algorithm can be extended to the multiple conductor transmission lines of fractional order model, also has certain applicability.
Research on Soft-Sensing Technique of Vehicle State Parameters
Authors: Du Feng , Guan Zhi Wei , Liu Chun Hui , Kong Chao
Published: October 2013

For meeting the needs of vehicle control system to some real-time parameters, a kind of soft-sensing technique was studied by using the extended Kalman filter theory in this paper. The specific flow for the application of extended Kalman filtering theory about the estimation of vehicle state parameters was presented detailedly, a state observer was established based on the vehicle dynamic model of a 2 degree of freedom. Simulation results indicate that these types of soft-sensing technique can measure some key state information of vehicle easily and accurately, such as longitudinal and lateral acceleration, and get real-time state estimates required by vehicle control system. Hence, it has very important meaning in reducing the cost of control system of vehicle.
A Developing Flood Automation System
Authors: Lai Horng Cherng , Yeh Ting Sung , Chang Jen Huan , Yen Yen Kuang , Ouyang Huei Tau , Hsu Hui Mi , Liu Chia Yu
Published: October 2013

The most desired disaster prevention in Taiwan has to be typhoon; therefore there is a saying good weather, good life. The government does everything to prevent nature disaster, preparedness, response and recovery, especially on typhoon flooding survey. In order to conduct instant contingency handling disaster reaction in biggest disaster conditions, the government hopes to control the disaster immediately, and calculate the disaster loss. The main purpose of this study is to build a flood automation system. Apply auto-recording water level monitoring system (internal or external water) from water stations to collect stage data, and integrate Geographic Information System by the terrain grid computing, then obtain the instant scope of inundation and flood depth. Together with the instant rainfall and forecast to achieve the effectiveness of the flood watch or warning, then we should possibly control the instant information for the anticipation of the flood disaster. Taking it further with the Flood Security Plan, we have the best reference for decision-making use in the Emergency Response Center. The study area is located in Yilan County, the most sensitive flooded region, to set up immediate foregoing typhoon instant information system or so-called flood automation system, and then by several times of investigations and post-disaster flood scar volume measured we completely record ground hydrological information, and calibrate it with water level gauges built by Taiwan National Typhoon and Flood Research Center and AWRSIP weather telemetry information platform of synthetic aperture radar images on the flooded scope and depth. The concept of flood automation system is based on the fact that the occurrence and distribution of flood is not merely a product of chance, but the result of a combination of climatic, hydrologic, geologic, topographic and soil-forming factors that together form an integrated dynamic system, thus, through a combination of real-time rainfall forecast, flood recording, automation requirement, Geographic Information System, flood warning, instant data transmission and the internet, be setting up an ideal typhoon instant information system, which can become high accurate and be suitable for easy use of flooded areas, in order to achieve sustainable development in those areas.
Hybridizing Adaptive Biogeography-Based Optimization with Differential Evolution for Global Numerical Optimization
Authors: Feng Si Ling , Zhu Qing Xin , Zhong Sheng , Gong Xiu Jun
Published: October 2013

Biogeography-based optimization (BBO) is a new biogeography inspired algorithm. It mainly uses the biogeography-based migration operator to share the information among solution. Differential evolution (DE) is a fast and robust evolutionary algorithm for global optimization. In this paper, we applied a hybridization of adaptive BBO with DE approach, namely ABBO/DE/GEN, for the global numerical optimization problems. ABBO/DE/GEN adaptively changes migration probability and mutation probability based on the relation between the cost of fitness function and average cost every generation, and the mutation operators of BBO were modified based on DE algorithm and the migration operators of BBO were modified based on number of iteration to improve performance. And hence it can generate the promising candidate solutions. To verify the performance of our proposed ABBO/DE/GEN, 9 benchmark functions with a wide range of dimensions and diverse complexities are employed. Experimental results indicate that our approach is effective and efficient. Compared with BBO/DE/GEN approaches, ABBO/DE/GEN performs better, or at least comparably, in terms of the quality of the final solutions and the convergence rate.
Microstructure and Properties of SiC Particle Reinforced Aluminum Matrix Composites by Powder Metallurgy Method
Authors: Fan Tao , Xiao Cong Li , Sun Yan Rong , Li Hong Bo
Published: October 2013

The aim of this study is to investigate the effect of SiC particle pretreatment, aluminum matrix particle size and sintering temperature on relative density, hardness, microstructure and wear resistance to SiC particle einforced aluminum matrix composites. To this end, the amount of 16.7 wt.% SiC with average particle sizes 20μm was used along with pure aluminum of average particle size of 75 μm and 25μm. Powder metallurgy is a method used in the fabrication of this composite in which the powders were mixed using a planetary ball mill. By analyzing SEM micrograph and the Property test, it is concluded that SiC particle pretreatment has significant effect on the morphology of pecimens. pretreatment increase the interface adhesion, improve the wettability. SiC is uniformly distributed in the matrix, with good relation to the substrate, the maximum hardness is 51.1HB, the minimum wear rate is 0.1684%, while the density is 97.3%.For the same SiC content and particle size, the smaller the particle size of aluminum matrix is, the higher wear resistance of composite materials is on condition that others are same, the higher sintering temperature and the higher the wearability of composites, the wear resistance of the composite material is significantly improved after SiC pre-processing.The relative density increases with increasing aluminum matrix particle sizes under the same pressure and the holding time. The actual density of all samples reached the theoretical density over 96%, to a maximum of 98.9%.
Control of Pneumatic Servo System Based on Neural Network PID Algorithm
Authors: Gong Qin Hui
Published: October 2013

The pneumatic servo system has characteristics of nonlinear, time-variant, large parameter variations and external disturbances, which is difficult to control. The conventional PID control is not suitable for the variable parameters of the controlled object, external disturbances. In this paper, the neural network controller combined with PID control is used to control the pneumatic servo system, and the structure diagram, algorithm and learning rule of the single neuron adaptive PID controller are put forward. The results show that,compared with the traditional PID control, the controller has significantly improved the control performance of system, Namely, the system has faster computational speed (real-time), stronger robustness and better adaptive ability.
A New Method Based on Position Sensitive Detectors to Measure Spatial Angle of Large-Scale Gyroidal
Authors: Sun Zhao , Song Qing , Liu Chang Qing , Wu Han Fei
Published: October 2013

Technology of spatial angle measurement is widely used in the aviation and national defence. Based on research of the spatial angle measurement, a system to measure the spatial angle is devised in this paper, which uses position sensitive detectors (PSD) as the detector and the laser beam emitted from a semiconductor laser as the straightness reference. The detecting system has some characteristics. A novel method is introduced to correct the spatial angle between the incident beam laser and the photoelectric surface of the PSD, which makes the incident beam laser vertical to the PSD. Besides, a back-propagation (BP) neural network is used in this system to compensate the nonlinearity errors of the 2-D PSD, which can improve the credibility of the detectors output data. It also has advantage of reliable data and high precision to measure the spatial angle of the large-scale gyroidal components. Meanwhile, the measuring principle, optical system and electric circuits of the experimental equipment are analyzed in the paper. The result shows that the experimental equipment is more precise and sensitive than old equipment. The relative error can achieve good accuracy. The detecting system has some theoretical research significance in realizing untouched measurement of large-scale gyroidal components in other similar situation.
Synthesis, Characterization, and Crystal Structure of Several Novel Acidic Ionic Liquids: 1-ethyl-2-alkyl-benzimidazolium Tetra-Fluoroborate
Authors: Wang Ming Tian , Pan Chang Ping , Gai Wei Peng , Lv Xiao Xia , Zhai Min Gang , Wang Wei , Peng Ze You , Chen Shuan Hu
Published: October 2013

A series of novel acidic ionic liquid: 1-ethyl-2-alkyl-benzimidazolium tetra-fluoroborate (alkyl= Et, Pr-n, Bu-n) were prepared by simple acid-based neutralization of 1-ethyl-2-alkyl-benzimidazole and tetrafluoroboric acid. The compounds were characterized by FTIR spectra, elemental analysis,1HNMR spectra and thermogravimetric analysis. These novel tetra-fluoroborate salts show good catalytic activity to esterification of benzyl alcohol and acetic acid. Furthermore, a crystal of ([H-ebBiBF4) was prepared with the crystal structure and determined by X-ray diffraction analysis. The molecular is of lamellar structure as mainly π electron ring is stacked interleaving between two layers. The results of cation and anion arranged orderly in pair indicate that the coulombic attraction is more dominant. Simultaneously, the weak local hydrogen bonds C-H···F exist in the molecules.
A Holistic Incentive Model of Information Sharing in Supply Chain
Authors: Wang Hong Wei , Yan Yu Song , Wei Long
Published: October 2013

It is broadly recognized by global companies that information sharing is one of the key aspects of coordination amongst parties in a supply chain. Companies can efficiently manage the product flow and information related to the issues such as production capacity, customer demand and inventory at lower costs through information sharing. Different incentive mechanisms were presented to tackle the complexities in information sharing. However, the relation between different incentive mechanisms and the performance measures of supply chain is not yet developed. The objectives of this paper are to: understand and appreciate various incentive mechanisms available for information sharing in supply chain, propose a holistic model to explore different incentive mechanisms both quantitative and qualitative and their value in supply chain.
Optimization Model and Algorithm for Smart Distribution Grid Maintenance Scheduling
Authors: Wei Wei , Chen Xing Ying , Chen Kai , Wang Chun Ning , Yu Kun
Published: October 2013

According to the actual situation of maintenance scheduling for distribution network, with the development of smart distribution grid, a maintenance scheduling optimization model which aims at taking the minimum electricity quantity caused by maintenance interruption without violating any constraints is proposed in this paper. Considering the actual situation, the temporary maintenance application and the maintenance status of equipment (outage or charged) are proposed in the objective function. In terms of constraints, leading in emergency degree constraint makes it possible that the maintenance scheduling can be sequenced according to orders of priority, which conforms to the development of smart distribution grid better. Then by use of improved genetic algorithm the optimization problem is solved. The test results show that the proposed model and algorithm can effectively solve the maintenance scheduling optimization problem.
Architecture Analysis Method Study Based on EID
Authors: Zhang Meng Meng , Luo Ai Min , Yang Wei Sheng , Zhang Xiao Kang
Published: October 2013

Extended Influence Diagram (EID) is a graph model for modeling and solving decision problems under uncertainty, extended from the Influence Diagram. Architecture analysis is one of the main contents of architecture lifecycle. This paper introduces the modeling elements and architecture analysis process of EID, specifics probability elicitation procedure of directly controllable node according to DM2, discusses architecture maintainability by EID, finally summarizes this method's advantages and disadvantages.
Preparation and Properties of Thermosensitive Poly(N-isopropylacrylamide-co-glycyrrhetinic acid) Microgels for Controlled Growth Factor Release
Authors: Zhao Yue Mei , He Xiao Ling , Li Jia Quan , Li Xiang Xu , Chen Li , Wei Dong Sheng
Published: October 2013

A series of poly (N-isopropylacrylamide-co-glycyrrhetinic acid) (P(NIPAAm-co-GA)) microgels were prepared by dispersion copolymerization. The morphologies of the microgels were observed by field scanning electron microscopy (FE-SEM) and transmission electron microscope (TEM). The temperature sensitivity of microgels was examined by measuring the optical transmittance of the microgel aqueous solution. Cytotoxicity of the microgels was investigated by MTT assay. The results indicated that microgel particles had a regular spherical shape of about 500 nm with narrow size distributions. Moreover, P(NIPAAm-co-GA) microgels exhibited good temperature sensitivity and low toxicity. This novel microgel could be expected as good candidate for controlled growth factor release.Intorduction
Using the Concept of Utility Solution Resource Allocation Problem with the Order
Authors: Li Qi , Zhu Xiao Guang
Published: October 2013

he resource allocation is very important in DP, but it doesnt take into account the order of the time for distribution object, By using the DP, the main application of the one-dimensional theory of resources allocation, It view of the actual situation from college students exam time arrangement with utility theory, during the practice the dynamic planning will be changed and Gantt charts will demonstrating together, the original has practical significance is more obvious.
Fabrication of Polyacrylonitrile Nanoporous Fibers via Electrospinning
Authors: Si Na , Xu Lan , Liu Fu Juan , Liu Hong Ying
Published: October 2013

This study provide several straightforward ways to fabricate nanoporous fibers with diameters in the rang from nanometers to several micrometers.The PAN nanoporous fibrous materials are unique in their ultrahigh specific surface and porous geometry and have the potential to meet emerging needs in advanced technical applications. PAN nanoporous fibers were electrospun in a single process by varying solvent compositions. Polyacrylonitrile (PAN) and Polylactide (PLA) bicomponent electrospun fibers, upon removal of the PLA by CF solvent extraction, became nanoporous. The surface morphology of the electrospun PAN fiber are investigated by a Scanning Electron Microscope (SEM).
Design and Exploration on Automobile Crane Mobile Counterweight Balance
Authors: Cheng Xian Chun , Jiang Xiao Wei , Cheng Zi Xuan
Published: October 2013

The automobile crane is a crane which is arranged on a common chassis or special automobile chassis, the driving cab and a lifting control room. The advantages of this crane is good mobility, transfer quickly. weight body truck crane is a very important part, but also a key part of the whole balance, its main function is to balance the gravity center of the whole lifting, make more stable, more safety. The current general crane are fixed weight, the weight is directly arranged motionless in the car tail, installation or transportation unloading work. This design is mainly the counterweight body is designed into a movable and rotatable, this mechanism has good flexibility, can adjust the balance weight body position, equivalent to adjust the focus of the counterweight body, enhance the lifting capacity and safety.
Best Scheduling Plan Choice Based on Mathematical Model
Authors: Zheng Yan Min , Zhang Jin Feng , Liu Qing Zhou
Published: October 2013

As information collection change with the events development in the situations of the emergency, a mathematical model is established on the basis of it, the emergency decision-makers take different measures at different times of emergencies is analyzed in detail to get the future demand for emergency resources information , then the optimal resource scheduling scheme was arrived. Finally, the method of how to use the model to generate the best scheduling plans is given by a specific example.
Analysis and Simulation of Mineral Grading Sieve Mechanism Motion Based on ADAMS
Authors: Cheng Xian , Dong Wei Min
Published: October 2013

This paper introduces a kind of screening machinery that applied to mineral grading.It needs to simplify its structure for expedient simulation and build the three-dimensional solid model of the screen frame in the SolidEdge circumstance, and then be imported into ADAMS software to improve and perfect the model and conduct the analysis and simulation. Ultimately the curves of motion and changes of pressure angle were obtained. The approximate formula of the screen frames acceleration can be obtained to find out the inertial acceleration of the mineral particles by analyzing and simulating its kinematics, which supplys the basis of Stress analysis of mineral particles on the sifter. It provides a theory to optimize screening machinery by analyzing the changes of pressure angle.
Economic Analysis on Application of Large Section Conductor in Ultra-High Voltage DC Engineering
Authors: Liu Zhen , Zhu Kuan Jun , Wan Jian Cheng , Zhang Jun , Si Jia Jun , Niu Hai Jun
Published: October 2013

At present, large section conductors applied in domestic ±800kV ultra-high DC power transmission line consist of 6×720mm2, 6×900mm2 and 6×1000mm2 conductors. This paper analyzes initial engineering investment and mechanical performance of 6×JL1/G2A-720/50, 6×JL1/G3A-900/40, 6×JL1/G3A-1000/45, 6×JL1/G2A-1250/70 and 6×JL1/G2A-1520/125 conductor plans, carry out economic comparison of the whole life period of these 5 conductor plans, demonstrate economic of 6×JL1/G2A-1250/70, and 6×JL1/G2A-1520/125 conductor plans in ±800kV ultra-high DC power transmission line is more advantageous when annual loss hours is too high, and the 6×JL1/G2A-1250/70 plan can save initial investment of engineering compared to the 6×JL1/G2A-1520/125 plan.
Reasons for Formation Damage and Preparation for Disentanglement Agent in Low Permeability Oilfield
Authors: Cao Jing Ping , Zhao Fu Lei , Zhang Kun
Published: October 2013

For the characteristics of serious formation damage and insufficient injecting in injection wells in the water flooding development process in low permeability oilfield, it carries the analysis of reasons for forming low efficient injection wells and the development of acidizing disentanglement agent. Through core damage experiment of wellhead sewage in S oilfield, formation damage is mainly caused by excessive levels of suspended matters and the multiple of exceeding standards is 45.3. Based on the result of core damage experiment and actual oilfield production data, the variation of apparent injectivity index in low efficient injection wells is researched. The research result indicates that formation damage radius of pollution wells is about 20m in this oilfield. Based on formation damage condition of this oilfield, compound acid is developed, which has the properties of strong penetration, retarding reaction velocity and strong-chelating. Plug removal experiment indicates that the recovery rate of core permeability is about 100% using developed compound acid.
Modal Analysis and Application Based on Finite Element Method
Authors: Wu Shu Qian , Wu Guo Qing , Zhou Jing Ling , Zhu Wei Nan
Published: October 2013

Mode is the natural vibration characteristics of the mechanical structure. Each mode has the specific natural frequency, damping ratio and modal shape. These modal parameters can be obtained by the calculation and experimental analysis. A calculation or test analysis process is called modal analysis. The analysis process is achieved if calculated by the finite element method, is called the analysis of calculating mode. The spindle mode of driving roll was analyzed in this paper. If clear structure in one easy frequency affected range of each order main modal characteristics through modal analysis method, it can predict the vibration response of this band structure of external or internal variety under the action of vibration. Therefore, the modal analysis is an important method for fault diagnosis of structure dynamic design. Comparing theory results with finite element results indicated that the error was less than 10 percent. The accuracy on the shaft modal analysis finite element method was improved.
Design of Temperature Detection Alarm Circuit Based on Multisim
Authors: Xu Wei Jian , Wu Tao
Published: October 2013

This paper mainly describes the characteristics of the utilization of thermistor resistance changes with temperature. When temperature is too low or too high, the thermal resistance values change correspondingly. This causes its associating sensor voltage signal changes. The changes of the voltage signal will lead to the subtraction proportional operation and dual comparator threshold voltage change correspondingly. This appearance enables the double threshold voltage comparators output highly, so that the multivibrator starts emitting diode conduct. Therefore the alarm circuit works.
Twin Gating System Design for Typical Thin Wall Stainless Steel Castings Based on Fast Pouring Mechanism
Authors: Yang Da Chun , Li Sen Lin , He Feng
Published: October 2013

The thin wall stainless steel castings is difference to ordinary steel castings in foundry technology. This paper discussed the problems of thin wall stainless steel castings which appearing in the flow controlling board for warm-air pipe, and put forward the foundry technology of this stainless steel castings based on the principle of directional solidification and fast pouring mechanism. According to the theory, twin gating system has been designed for the controlling board castings, and two ladles are pouring into the open twin gating system at the same time. The shrinkage of finally congealing part was fed by two risers. The practice has shown that the design is feasible, there is not cold shut, misrun, scab, and oxidizing for the castings, and the requirements of mechanical properties can be met.
Design and Processing of Temperature Resistant Enamel Coating Materials
Authors: Fu Xin , Zhang Chun Hua , Li Chun Qi , Li Ke Jun , Zuo Yu Bnag
Published: October 2013

In this work, a porcelain enamel coating material for high temperature resistant on 1Cr18Ni9Ti stainless steel is designed and processed. The structure and properties of the material are analyzed by SEM, EDAX, XRD and FTIR. The results show that the surface of the enamel glaze and the enamel coating are smooth and bright, there is no obvious crystallization characteristics in porcelain enamel. There is litter oxidation and inter-diffusion in the interface between 1Cr18Ni9Ti stainless steel and porcelain enamel coating material after coating enamel.
Study on the Texture of Materials in Stop Motion
Authors: Yang Wei Shu
Published: October 2013

Stop motion is an animation form full of amusement, in todays animation industry we have profound 2D and 3D works been produced which lead the audience to an motion fatigue on these fictitious experiences, they tend to watch more vivid and authentic stop motion, why audiences are deeply attracted by characters made of various materials? And why stop motion can express a strong sense of authenticity? This essay will demonstrate the features of materials through the study on the texture and unfold the beauty of this material expression.
Virtual Material Model of Joint Interfaces Considering Elastic-Plastic Deformation of Asperities
Authors: Cai Li Gang , Xu Teng Yun , Zhao Yong Sheng
Published: October 2013

A virtual material model of joint interfaces was established based on the Hertz contact theory and fractal theory, this model was improved by considering the influence of the elastic-plastic deformation of asperities and ameliorating the calculation methods of the elastic modulus. The simulation results of elastic-plastic considered and elastic-plastic unconsidered were compared, moreover, the finite element simulation results and experimental results were compared to fully explain the necessity of considering the influence of the elastic-plastic deformation and the the correctness of the method to calculate the elastic modulus. The research suggested that under a same load the elastic modulus of the model considering the influence of the elastic-plastic deformation was slightly larger than the un considering one, which means it could describe the characteristics of joint interfaces more accurately.
The Effect of HNO3 on Functionalization of CNTs
Authors: Wang Fu Xia
Published: October 2013

For the combination of unique structure, dimension, strength, chemical stability, and electronic properties, carbon nanotubes (CNTs) are very important materials. However, CNTs from commercial sources usually contain some impurities, such as amorphous carbon, metallics, which are usually eliminated by some purification processes that includes reflux in acids and strong oxidation. This strong chemical procedure may damage the nanotube properties and it is thus important to control the extent of oxidation during the purification procedure. In this study, we provide a comprehensive study of the structure and physical composition of CNTs during each step of the purification process. Techniques such as scanning electron microscopy and Infrared spectroscopy were used to track the CNTs structure, in terms of length and diameter distribution, and surface chemical modifications during each purification stage.
Effect of Equal Channel Angular Pressing on Corrosion Resistance of Al-Mg Alloy
Authors: Fang Da Ran , Li Fang , Liu Feng Fang , Li Jia Jun , Zhao Nai Qin
Published: October 2013

Al-2.8wt.%Mg alloy samples were subjected to equal channel angular pressing (ECAP) with different number of passes, and the corrosion resistance of as-cast and ECAP-processed samples was investigated by immersion tests and electrochemical impedance spectroscopy measurements. The results show that the corrosion resistance of the alloy is improved with increasing ECAP passes.
Simulation Research on Three Kinds of Alloy Material for Penetration
Authors: Huang Xue Feng , Wang Wei Li , Jiang Ying Zi , Fu Lei , Fan Zhuang Qing
Published: October 2013

Using the finite element software LS-DYNA to establish the shell, fuse, fuse base, cover and charge model of a semi-armor-piercing warhead, and simulating penetration for three different alloy shell of the warhead at a velocity 300m / s, target thickness 34mm . Researching on warhead penetration process, at the same time, analyzing the effects of warhead penetration performance, speed and overload at different alloys material. The results showed that: G50 is the best performance penetrating material, slightly better than the 30CrMnSiNi2A materials. TC4 material is the lowest penetration performance compared to the G50 and 30CrMnSiNi2A material.
The Experimental Study on Consolidation of RTV for Wet-Area Earthen Ruins in Southwest China
Authors: Wu Yi
Published: October 2013

It is a worldwide difficulty to preserve earth monument in wet area. To solve this problem, Physical Chemistry Institute of Zhejiang University in China developed a consolidation agent named RTV (organopolysiloxanes+tetraethylorthosilicate). But the study on this consolidation agent is still in its initial stage at present for most of its experimental researches are limited to east china and no research reports aimed at wet area in southwest China were found so far. To check out the efficiency of this consolidation agent for earth in wet area, southwest China, a consolidating experiment was conducted by applying this consolidation agent to soil samples from kiln Qionglai earthen monuments located in outskirt of Chengdu city, the capital of Sichuan province. In this experiment, the changes of weight, permeating speed and depth and compressive strength of specimens after consolidating were investigated and compared with those for northwest area. The study shows that RTV consolidation agent developed by Physical Chemistry Institute of Zhejiang University is also effective to a certain degree for the earth monument in wet area, southwest China.
The Car Brake System Design and Calculation
Authors: Wang Yong
Published: October 2013

Calculation of car brake system design, also according to the known automotive related parameters is obtained by calculating the main parameters. The brake and braking torque, braking moment and braking force distribution coefficient and hydraulic brake drive mechanism related parameters. Finally, the braking performances are analyzed in detail.
Investigation on a New Type of Pneumatic Flexible Joint
Authors: Liu Xiao Min , Geng De Xu , Zhao Yun Wei , Wu Guang Bin
Published: October 2013

To improve the transversal stability and lateral stiffness, this paper develops a new type of pneumatic single bending joint. The single bending joint is pneumatic composite elastomer, and its driving system combined into one. The inside of the joint is elastic rubber tube and the outside is a set of closely constraints ring suit. When supplied the air pressure, the joint bends under the action of the bending moment generated at the end of the joint. The bending experiments have been done on the static experimental device and the relation between the bending angle of joint and the air pressure is acquired.
Similar Structure of Solution for the Model of Nonlinear Spherical Seepage in Composite Reservoir
Authors: Zheng Peng She , Li Shun Chu , Leng Li Hui , Liu Hua Ping , Gui Dong Dong , Li De Xing
Published: October 2013

The well testing model of nonlinear spherical percolation problems for composite reservoir is established under three different outer boundary conditions: closed boundary,constast pressure boundary,infinity boundary. the mathematical model are linearized by using variable substitution method, and then its solutions are derived by Laplace transform. According to the theory of similar structure of solutions to the differential equations, we obtain the similar structure of the solutions .The theory of similar structure is beneficial to understand the inherent laws of solutions and analyze the influence of parameters to solutions.
Preparation and Performance Evaluation of PU Foam Composite Board
Authors: Lin Jia Horng , Chuang Yu Chun , Lou Ching Wen , Li Ting Ting , Huang Chen Hung
Published: October 2013

As improvement of industry and society, some potential crisis happened in working and living environment is taken into account by human people. Meanwhile, different kinds of protective appliances develop rapidly, and composite boards with cushion and puncture-resistance property are required consequently. This study aims to develop a cushion/puncture-resistance PU foam protective composites. This paper used Polyol and Isocyanate to prepare porous PU foam composite via foaming and curing process. By changing foam density and addition amount, cushion and puncture-resistance property were tested and then evaluated to seek for PU foam composite with cushion and puncture-resistance property. Result shows that, when density was 80 kg/m3, PU foaming composite board had the optimum resilience rate of 44 %, lowest impact remaining load of 638 N and best puncture-resistance force of 138.3 N.
Optimization Techniques in Numerical Simulation of Casting Process
Authors: Zhang Guo Hong , Li Rong De , Tian Chang , Qiu Ke Qiang , Ma Jun Xian
Published: October 2013

This paper presents an overview and example using optimization techniques in casting numerical simulation. Most of the design work can fulfill with the software without human intervention. It really frees the engineer from the amount of trial-and-error that is necessary in traditional modeling.
Parallel Machine Scheduling with Fuzzy due Date Using Improved Simulated Annealing in Lean Production
Authors: Yang Hong Bing , Mao Fang Yan , Xu Jun Hao , Shi Han Xiu
Published: October 2013

Tardiness scheduling problems in the lean production has received extensive attention recently, and in most tardiness scheduling problems job due dates are regarded as invariable and known in advance. The study deals with fuzzy tardiness scheduling for parallel machines with fuzzy job due dates, where the objective is to minimize the average penalty cost of jobs tardiness. To describe the tardy degree of job clearly, a novel tardiness measure index is introduced based on the possibility and necessity measures in the study. And further, the mixed integer programming scheduling model of parallel machines is constructed for jobs tardiness. Since this problem is NP-hard, an improved simulated annealing is proposed and designed to solve the model. Finally, a numerical experiment is presented to illustrate the feasibility and effectiveness of the proposed method.
Polyester/Low Melting Point Polyester Nonwoven Fabrics Used as Soilless Culture Mediums: Effects of the Content of Low Melting Point Polyester Fibers
Authors: Lin Jia Horng , Hsieh Jing Chzi , Lin Jan Yi , Lin Mei Chen , Lou Ching Wen
Published: October 2013

Soilless culture mediums are able to increase the greening areas and decrease the amount of carbon dioxide (CO2), which reduces the global temperature and the green house effect. The aim of this study is to explore effects of the content of low melting point polyester (LPET) fibers on the physical properties of the polyester (PET)/LPET nonwoven fabrics. PET fibers and LPET fibers are blended with various ratios, and made into PET/LPET nonwoven fabrics with a nonwoven process. The air permeability, water content, water retention, and pH value tests are performed on the resulting fabrics. The experiment results show that increasing LPET fiber content increases the air permeability and water content, but decreases the water retention. The LPET content does not have an influence on the pH value.
Research on the Anti-Vibration Technology of Large Cross-Section Conductor
Authors: Zhang Jun , Zhu Kuan Jun , Liu Zhen , Zhan Xue Ping
Published: October 2013

The conductor is an important part of the process of power transmission. Keep conductor to be normal operation is an important link of power transmission. In practice, Due to the influence of many weather environments, such as wind, temperature, rain and snow, the conductor often appear ice disaster, dance and other disasters; therefore, the anti-vibration technology of conductor is an urgent need to develop. This paper masters the performance of damper by carrying out a great deal of performance test analysis, such as self-damping, the power of damper, anti-vibration effect. At the same time, this paper understands the effect of spacer arrangement on the sub span oscillation, through the finite element analysis and lingo program of nonlinear programming, laying the foundation for studying anti-vibration technology for large cross-section conductor.
The Analysis of Bioprosthetic Heart Valve with Different Suture Densities
Authors: Yuan Quan , Zhang Xia , Zhang Jun , Huang Xu
Published: October 2013

In order to investigate the effect of suture density on the dynamic behavior of bioprosthetic heart valve, we establish the spherical leaflets models via computer aided design. Based on the parametric models of the heart valve, four kinds of suture density is analyzed and finite element analysis is used to simulate the mechanical performance of bioprosthetic heart valve. The results show that the stress distributions of the spherical valve leaflets with different suture density is quite different and the peak von-Mises with 50 suture points is lower than the other three kinds of suture density. From the whole loading process, we can find that the spherical valve leaflet with 50 suture points has better dynamic properties. This work is very helpful when manufacuturing the bioprosthetic heart valve，thus to prolong the lifetime of the bioprosthetic heart valve.