bluuebunny/crossref_metadata_2025 huggingface dataset:
A Self-Alignment Sealing Hatch-Door System Updated for Airlock Chambers of KM6 Space Simulator
Authors: Guo Feng , Liu Bo Tao , Han Xiao , Qi Yan , Zhang Yi
Published: August 2013

KM6 space simulator built in 1990s is currently the largest thermal vacuum test facility for spaceships and satellites in China. In order to meet new requirements of ground test for outer-cabin space walk of astronauts under China Manned Space Project II, a hatch-door system with ten rectangular doors in auxiliary horizontal chamber of KM6 space simulator has been updated since 2006. For the sake of pressure balance, every hatch-door is upgraded with a pressure regulator, which enables easy close and open of every hatch-door under no pressure difference. To improve vacuum compatibility of rotating hatch-doors, single axis hinge mechanism is renewed as biaxial hinge mechanism with more degrees of freedom for door spindle, which is combined with coordinated lock mechanism and O-ring sealing structure to realize the self-alignment sealing of hatch-door flange structure. Up until now, three manned spaceships of SZ-5, SZ-6 and SZ-7 have successfully finish thermal vacuum tests in auxiliary horizontal chamber with high performance of the updated hatch-door system as results.
Design of an ASIC Chip for Spacecraft Data System
Authors: Zhou Li , An Jun She , Fang Qing Wen , Cai Fei
Published: August 2013

ASIC (Application Specific Integrated Circuit) technology is mature and widely used in many fields. It is a trend to integrate some common spacecraft engineering requirements into one chip to take the place of FPGA and some digital chips, which can miniaturize spacecraft avionics and reduce the repeated work for spacecraft engineers. Based on the analysis on small satellites application requirements, the system design of an ASIC chip for spacecraft data system is proposed. Firstly, the chip system architecture is described. Secondly, four key technologies of the ASIC chip design are presented in detail. They are the design of the chip's operating modes, the design of IP cores, the design of reliability, and the design of low power consumption. Generality, adaptability and independent intellectual property make this ASIC different and special from other space chips. Four operating modes are optional: 1553B bus control mode, PCI control mode, ISA control mode, internal CPU control mode. Besides, there are 1553B bus protocol IP cores, CAN bus interface, and abundant peripherals, which can satisfy most of the routine engineering requirements in small satellites. Finally, the chips status and some promising applications are described.
Influence of Insulated Rectangular Block on Natural Convection Heat Transfer within Porous Enclosure
Authors: Faghiri Ali Hooshyar , Aybar Hikmet Şeli , Egelioglu Fuat
Published: August 2013

Numerical study has been performed to investigate the influence of rectangular block on mean Nusselt number of hot wall in a square cavity of porous media. Top and bottom walls are insulated and the right and left walls are cold and hot, respectively, at constant temperature which are heated differentially assuaging a steady condition. 4 distinct cases are introduced regarding the block position: The block at the bottom/top edge with variable distance from the hot wall and the block at the middle edge of bottom/top with variable height. Mean Nusselt numbers are normalized with the simple case of no insulated block. Results show a significant dependence of mean Nusselt on the block position. It also affects the dimensionless time to reach a steady status..
Review of Passive Downdraught Evaporative Cooling Technique and its Application
Authors: Qiu Jing , Li Bao Feng , Qiu Yu
Published: August 2013

Direct evaporative cooling has long been demonstrated as an energy efficient ,cost effective and no CFCs emission means for space cooling in hot dry regions .With the aggravating of the global climate warming and energy crisis, using passive cooling technique will be a good solution . In this paper, the theory of passive downdraught evaporative cooling techniques is analyzed. It is an environmental friendly technique in that it can provide more fresh air than the conventional air-conditionings, and also low cost on operation and no CFCs emission compared with conventional air-conditionings. In this paper, some cases will be introduced .The successful PDEC cases in hot dry areas show weather condition is the key factor for the feasibility using PDEC technique. From the analysis on the weather data in Turpan, which presents a typical climatic character in North-west China , predicts a great feasibility of using PDEC technique in public architectures.
Parallel Extrusion of Aluminum Alloy Heat Sink with Round-Fin
Authors: Zhang Li Han , Wang Ke Sheng , Han Yu , Ying Jia Yu
Published: August 2013

Parallel extrusion is a combined extrusion process for forming round-fin heat sink on thick metal sheets. In this paper, the parallel extrusion has been applied to manufacture the round-fin heat sink in the automotive lighting. Numerical simulations on the round-fin heat sink forming using the software DEFORM were carried out. The tooling structure with counterpressure on the heat sink formation was investigated. The results show that the tooling structure with counterpressure is helpful to the formation of round-fin heat sink, which not only ensures the height of each round-fin on the heat sink is uniform but also retards the initiation of flow-through on the reverse side of round-fin. In addition, the experiments of press forging process were conducted to validate the finite element analysis, it is shown that the friction at the punch-blank interface has more significant effect on preventing the initiation of flow-through compared with the friction at the die-blank interface, which implies that the punch-blank interface has more significant effect on the material flow in the formation of round-fin, and the simulation results are in good agreement with the experimental data.
Experimental Study on Dynamic Adsorption of Xenon over Adsorbents
Authors: He Guo Li , Yi Hong Hong , Tang Xiao Long , Li Fen Rong , Li Yun Dong , Li Kai
Published: August 2013

Selecting effective xenon adsorbents is important for preventing significant global nuclear proliferation. The adsorption capacity of coconut shell activated carbons (SAC),zeolite 10X,zeolite 5A, zeolite 13X were researched and the Xenon adsorption of the coconut shell activated carbon modified by KOH(SAC/KOH-1 and SAC/KOH-2) were compared in this paper. The factors of temperature and flow rate that influenced the dynamic adsorption of xenon by 10X were discussed. The order of the Xenon adsorption capacity is as follows: zeolite 10X, SAC/KOH-2, SAC/KOH-1, SAC, zeolite 13X, zeolite 5A.
Evaluation of Earth-Air Heat Exchangers Efficiency in Hot and Dry Climates
Authors: Oudjehani N. , Abahri K. , Tahakourt A. , Belarbi Rafik
Published: August 2013

Energy efficiency of building, promotes strongly the integration of passive strategies, in order to achieve a thermal comfort especially in summer conditions by reducing or preventing the use of air conditioning systems. In this work, building energy performance has been evaluated using an earth-air heat exchanger (EAHE) during summer period. Energy requirements was analysis by the means of dynamic simulation tools called (TRNSYS) for hot and arid climate in the southern Algeria. This analysis was conducted function of different (such as soil typology, tube material, tube length and depth, ventilation airflow rates). Results show that earth-air heat exchanger has the highest efficiency for arid climates. Furthermore, the possibility of coupling of this technology with other passive strategies (nocturne ventilation and thermal mass) has been also examined. High efficiency was observed.
Teager-Huang Transform Based Gear Crack Fault Detection and Diagnosis
Authors: Wang Ya Ning
Published: August 2013

The newly developed Teager-Huang transform (THT) enables one to look at the evolution in time of a signals frequency components. In this paper, a novel application of Teager-Huang transform method to fault diagnosis of gear crack is presented. The methodology developed in this paper decomposes the original times series data in intrinsic oscillation modes, using the empirical mode decomposition (EMD). Then the Teager Kaiser Energy Operator (TKEO) technique is applied to each intrinsic mode function (IMF). Therefore, the time-frequency distribution of the vibration is obtained. The basic method is introduced in detail. The Teager-Huang transform is applied in the research of the faults diagnosis of the gear crack. The experimental results show that Teager-Huang transform can effectively diagnosis the fault of the gear crack.
Analysis of LED Backlight Design Based on Dynamic Regional Control Technology
Authors: Cao De Yue , Zou Yi
Published: August 2013

This paper briefly explains the advantages of LED and the classification of LED backlight and explores the pattern of LED backlight based on dynamic regional control technology to overcome and improve the inherent problems of LCD TV monitor on purpose of reducing power consumption and saving energy.
Effect of Al2O3 Nanoparticles Additives on Thermo-Elastohydrodynamic with Newtonian Lubricant
Authors: Rattapasakorn Sountaree , Mongkolwongrojn Mongkol
Published: August 2013

This paper presents the effect of Al2O3nanoparticles additives on thermoelastohy-drodynamic with Newtonian lubricant. The modified Reynolds equation and energy equation have been formulated and solved numerically with initial conditions using multi-grid multi-level method. Simulation results show the operating with Al2O3nanoparticles blended particularly with SAE-90 lubricant. The maximum pressure and temperature decreases, as compared to SAE-90 oil without nanoparticles additives.
The Research and Application of Crop Environment Remote Monitoring System Based on GPRS and Kingview
Authors: Min Liu
Published: August 2013

This article designed a kind of crop environment remote monitoring system, it was configured with kingview 6.55, set the remote data acquisition, remote data transmission, remote control, automatic irrigation, pressure regulation, flow adjusting, overrun alarm, water pump automatic start-stop control for an integrated control system. The system realized monitoring, transmission, diagnosis, decision making and crop water dynamic management. And according to the information such as the water demand of crop growth to realize adaptive water-saving irrigation, the adaptive water-saving irrigation is realized to achieve a precise irrigation purpose. The system adopted B/S structure and the Web new edition function; the administrator can achieve the remote monitoring through the Internet which overcomes the restriction of time and location. At the same time, the crops field control level can select configure solar power as necessary which reduces the tedious work of electricity wiring, and achieves the purpose of energy conservation.
The Spindle Component Analysis of Inner Cavity Shaping Machine Tool
Authors: Wang Zai Jin , Li Qiang
Published: August 2013

This paper takes the spindle of inner cavity shaping machine tool as the research object, analyzes the spindle structure of the machine tool and establishes the equations of motion, analyzes the influence that the spindle speed and tool deflection speed have on the tool rotary speed using Matlab and ADAMS, determines the allowed deflection range of the tool, sets up the transfer function of the servo motor current loop and analyzes the stability of spindle servo motor current loop .
Relationship between Correlation Immune Order and Algebraic Immunity Order of Boolean Functions
Authors: Huang Jing Lian , Wang Zhuo , Liu Ya Jing
Published: August 2013

Using the derivative of the Boolean function and the e-derivative defined by ourselves as research tools, we go deep into the internal structure of the Boolean function values. Additionally, by the methods of cascade calculations and analytic combinatorics, cryptographic properties such as correlation immune and algebraic immunity of H Boolean functions with Hamming weight of with diffusibility are studied. Then we prove the existing of m order correlation immune H Boolean functions ,and get the result of the sufficient and necessary conditions of algebraic immunity order is 1 of Boolean function with correlation immune order is m.
Breeding Estimated Particle Filter
Authors: Hou Yu Bao , Tang Shu Yan
Published: August 2013

As the normal particle filter has an expensive computation and degeneracy problem, a propagation-prediction particle filter is proposed. In this scheme, particles after transfer are propagated under the distribution of state noise, and then the produced filial particles are used to predict the corresponding parent particle referring to measurement, in which step the newest measure information is added into estimation. Therefore predicted particle would be closer to the true state, which improves the precision of particle filter. Experiment results have proved the efficiency of the algorithm and the great predominance in little particles case.
Stand-Alone Super Capacitor Charging System with the Design of Starting Protection
Authors: Huang Chia Wei , Huang Ton Churo , Leu Yih Guang
Published: August 2013

This paper focuses on analyzing the problem that occurs when running a stand-alone super capacitor charging system, which is capable of working independently without relying on any external power supply. Components are easily damaged due to overloading. This occurs at the moment when the stand-alone super capacitor charging system switches on. To solve the problem, this paper not only finds the reason why the inductor current of the boost converter saturates at the switching moment, but also analyzes the waveforms of the inductor current at the switching moment. Finally, the verification of the circuit characteristics with an external stimulation was carried out with both experiments and simulation.
A Mathematical Model of Functionally Graded Materials Thin Plates and Levy Solutions
Authors: Wang Ming Lu
Published: August 2013

The governing equation of elastic FGM thin plates was obtained by degenerating the governing equation of viscoelastic FGM thin plates. A Levy solution of a simply supported FGM rectangular plate was gotten. Based on the Levy solution, the influence of considering and ignoring mid-plane stain, due to the inhomogeneous property of the functionally graded materials, on the static responses of the functionally graded materials thin plate is investigated.
Bit Error Rate Improvement of Hard Disk Drive
Authors: Dumrongvanich Acharaporn , Senjuntichai Angsumalin
Published: August 2013

The objective of this research is to improve the performance of the read-write head process in Hard disk drive manufacturing with respect to Bit Error Rate (BER). With the preliminary survey, the process capability index (Cpk) of BER was 0.72 which is less than the one side acceptable value at 1.25. To improve Cpk of BER, five phases of Six sigma approach are applied starting from define, measure, analyze, improvement and control phases. At 95% confidence, thermal protrusion, writing current amplitude, writing current overshoot, number of defects on media and writing head width are the significant factors for Bit Error Rate due to their p-value less than 0.05. Since the number of defects and writing head width are uncontrollable factors, the experiment are designed and performed based of general factorial design with three levels of each controllable factor. At 5% significance level, there are the interaction effects between the thermal protrusion and the writing current amplitude as well as the interaction affects between the writing current amplitude and the writing current overshoot. With the general linear model (GLM), the suggested values for the thermal protrusion, writing current amplitude and writing current overshoot are 35 DAC, 10 mA and 9 mA, respectively. Under the suggested condition, Cpk of BER is increased from 0.72 to 2.38 and the percentage of defective due to head related failure is reduced from 21.85% to 9.86%.
Mechanical Properties of ZTA Composite Using Cold Isostatic Pressing and Uniaxial Pressing
Authors: Al Bakri A.M. Mustafa , Fauzi Mohd Noor Ahmad , Kamarudin H. , Norazian M.N. , Salleh M.A.A. , Alida A.
Published: August 2013

Alumina-zirconia composite is an engineering material with a great potential to be develop for application as high temperature resistance structural material. In this research, zirconia toughness alumina (ZTA) was produced by physical interaction between Al2O3powder and Y2O3-ZrO2powder. Two composition of powder with different Al2O3: Y2O3-ZrO2ratio was used, 70:30 and 80:20 by weight. Two different compaction methods, i.e. uniaxial pressing and cold isostatic pressing (CIP) with a maximum load of 150 MPa were used in this research to investigate the differences in properties of composites. Sintering process was done at four different temperatures with the heating rate is 5 o C/ min with a soaking time of five hours. Mechanical testing, i.e. compressive strength and hardness was performed to all samples. The microstructure analysis using a Scanning Electron Microscope SEM was also studied. From the result, the composite with the ratio of 70:30 showed better mechanical properties as compared to 80:20 composite. Addition of zirconia in the composite gave an increased in toughness due to transformation toughening mechanism of tetragonal to monoclinic phase. As a conclusion the composites produced high compaction green density will improved the sintering process, resulting in improved mechanical properties.
Mathematical Model of Oceanographic Buoy Solar Energy Power Source Design Based on Double Batteries
Authors: Zou Guo Liang , Lou Xin Nan
Published: August 2013

To implement the objective of steady operation of the marine observation buoy system on the sea throughout the year,based on energy balance between supply and demand, this paper presents the mathematical model of solar energy power supply system derived from double batteries switching technology. The batteries are divided into main batteries and auxiliary batteries. The main batteries are used regularly and the auxiliary batteries are used in periodic rainy weather. The main advantage of this model is that the capacity of auxiliary batteries can be dynamic calculated based on the numbers of maximum continuous rainy days and minimum intervals between rainy days. The batteries capacity is sufficient but not redundant. This design project has been tested on marine buoy and the accuracy of the model is splendid for most engineering projects.
The Effect of Various Catalyzers on Transesterification in Reactive Blending PC/PLA Blends
Authors: Chen Yi , Peng Yue , Liu Wen Yong , Zeng Guang Sheng , Yang Jun Hong , Yan Xue Hui
Published: August 2013

Polycarbonate/Poly (lactic acid) blends were prepared through melt blending at the present of different kinds of organotin catalyzers such as monobutyltin oxide (MBTO), di-n-butyltinoxide (DBTO), di-n-octyltin oxide (DOTO), and dibutyltin dilaurate (DBTL). The effect of kind and mass of catalyzers on the properties of blends were investigated. The results showed that the DBTO is the most effective catalyzer on catalyzing the transesterification between PLA and PC, which corresponds to the analysis of morphologies and mechanical properties of blends. The use of DBTO could improve the compatibility and thus strengthen the mechanical properties of blends signficantly , and the optimal mass is 0.8wt% of blends.
Interpretation of Transparency in the Design of Green Office Buildings
Authors: Ren Juan , Liu Yu , Zheng Gang
Published: August 2013

Green buildings have caught increasing attention in the global context. For green office building (GOB), the design should satisfy both the natural and working environmental considerations. Noticing that while a wide range of eco-technologies have been applied in existing GOBs, comparatively less than enough attentions have been put on the art performance of such buildings, this paper introduces and discusses how transparency, as an important visual language in modern architecture, can be used as a tool to bridge and emphasize the inseparable connection between art and technology in the architectural design area. The purpose of this paper is not only to explore and discuss new concepts regarding design of GOBs, but also to provide references for sustainable design in a larger perspective.
Effect of Antimony Doping on the Properties of a Green Energy Cathode Material LiFePO4 for Lithium Ion Batteries
Authors: Fey George Ting Kuo , Huang Kai Pin , Peng Po Yu , Lin Yi Chuan , Cho Yung Da , Kao Hsien Ming
Published: August 2013

LiFePO4is considered an environmentally friendly, popular cathode material for lithium ion batteries because of its low raw materials cost, non-toxicity, and excellent thermal stability. The antimony (Sb)-doped LiFePO4/C materials are successfully synthesized by a high-temperature solid-state method in this work. The effects of Sb concentration and synthesized temperature are reported. The sample doped with 1.0 mol.% Sb and synthesized at 873 K delivered the best discharge capacity of 154 mAh g-1at a 0.2 C-rate. Furthermore, the LiFe0.99Sb0.01PO4/C materials synthesized at 973 K can sustain a 28 C-rate between 4.6 and 2.0 V, and this rate capability is equivalent to charge or discharge in 129 seconds. The doped cathode materials are also characterized by a XRD technique for structure analysis.
Creep of Cementitous Materials with Addition of Fly Ash in Time
Authors: Padevět Pavel , Bittnar Petr
Published: August 2013

The cement paste forms the basis of a concrete composite. This article is focused on the analysis of the creep of cement paste with fly ash based on experimental measurements. Measurement results of creep-dried and water saturated pastes are presented. The ratio of cement to fly ash of 1:1 was used for the production of the mixture. Experimental measurements were carried out on material age of 4 months.
Optimization of Stepped Elastic Plastic Plates
Authors: Lellep Jaan , Vlassov Boriss
Published: August 2013

A method of analysis and optimization of stepped plates made of elastic plastic materials is developed. The stress-strain of the plate is defined for the initial elastic and subsequent elastic plastic stages of deformation. Necessary optimality conditions are derived with the aid of variational methods of the theory of optimal control. This results in a differential-algebraic system of equations. The latter is solved numerically. The effectivity of the design established is assessed in the cases of one-and multi-stepped plates assuming the material obeys the Tsai-Wu or von Mises yield condition.
Ecological Strategy of Architectural Design
Authors: Yong Liu
Published: August 2013

Through the research and analysis of the ecological architecture design background, the analysis of its concept, the illumination of the theories and some explanations of the ecological architecture practice in China and other countries, this paper make a further discussion on the ecological strategies that can be applied into the architecture design process and the development prospect of the green ecological architecture design.
The Research on Modified Park-Ang Damage Model Based on Effective Energy Dissipation
Authors: Fu Guo , Liu Bo Quan
Published: August 2013

Collapse of buildings in earthquakes causes casualties and economic losses, the reinforced concrete columns damage models is a basis for the research of integer collapse. The major advantage of Park and Ang's method is the consideration of first exceedance failure and cumulative damage failure in terms of defining the structural damage under earthquake, however, it isn't consider the differences of structural failures by different displacement amplitudes and load sequence. By multiplying the effective energy dissipation factor and the load sequence factor, the modified Park-Ang seismic damage model is obtained. The comparison between the two models indicates that the modified Park-Ang model have mean value closer to 1 and smaller scatter, besides the effects of load path and load sequence on damage can be taken into account in the modified model.
Application of Entropy-Weight Hierarchy Analysis on Study of Height Prediction of Water Conducted Zone
Authors: Xu Meng Lin , Zhao De Shen
Published: August 2013

Based on actual measurement data in Da Ping as the samples,according to the experience, and ends with calculate every factors weight and height prediction of the water conducted zone by Matlab using the combination entropy-weight method and analytic hierarchy process. this paper introduces a comprehensive prediction model consisting of analytic hierarchy process and combination entropy-weight method. The method,overcoming weights imbalance,gives the evaluation result better than does the single analytic hierarchy process, it is a new valid method for scientific forecast on water conducted zone.
Study on Fully-Mechanized Face Quick Withdrawal Suite of Hydraulic Support Design and Application
Authors: Zhang Lian Bao , Wu Zhi Zhen , Meng Xiang Hui
Published: August 2013

This paper mainly analyzes suite of hydraulic support technical parameters and structure design applied to fully-mechanized faces withdrawal, according to coordinating with auxiliary roadway multi-channel crafts, which achieves fully mechanized support in the fully-mechanized face in Inner Mongolia and Shenmu. It provides automatic essential equipment for fully-mechanized face withdrawal. Using computer technology to study the suite of hydraulic support: Using designed analysis software optimizes and designs the support the structure parameter to achieve the optional performance and enhance stability, supporting performance and anti-twisting property. Experiment of prototype was produced to simulate the moving process exactly by virtual prototype technology and three-dimensional entity design software, optimizing the original project. Operating condition of supports in the underground mine was simulated for overall strength analysis with virtual prototype technology.
Research on the Bending Properties of the Bamboo-Wood Container Flooring
Authors: Wei Juan , Zeng Dan , Guan Ming Jie
Published: August 2013

In this paper, the bending properties of bamboo-wood container flooring and bamboo curtain-OSB container flooring were tested and the six-cycle artificial accelerated aging method of ASTM D1037 was conducted to evaluate the aging performance of two kinds of bamboo-wood container floorings. The modulus of rupture (MOR) and modulus of elasticity (MOE) were tested in the longitudinal and transverse directions before and after aging. The results showed that both the bending strength and MOE decreased after aging. The retention ratios of MOR of the bamboo-wood container flooring and bamboo curtain-OSB container flooring were respectively 43.5%, 72.0%, and the retention ratios of MOE were 54.6%, 76.3%. In general, the effect of aging on the bamboo-wood container flooring was larger than that on the bamboo curtain-OSB container flooring.
Analyzing the Characteristics of the Cavity Nucleation, Growth and Coalescence Mechanism of 9Cr-1Mo-VNb Steel (P91) Steel
Authors: An Li Li , Xu Qiang , Lu Zhong Yu , Xu Dong Lai
Published: August 2013

Creep damage is one of the serious problems for the high temperature industries and computational approach (such as continuum damage mechanics) has been developed and used, complementary to the experimental approach, to assist safe operation. However, there are no ready creep damage constitutive equations to be used for predicting the lifetime for this type of alloy, particularly for low stress. This paper presents an analysis of the cavity nucleation, growth and coalescence mechanism of 9Cr-1Mo-VNb steel (P91 type) under high and low stress levels and multi-axial stress state.
The Design and Simulation of a New Z-Axis Resonant Micro-Accelerometer Based on Electrostatic Stiffness
Authors: Yang Bo , Dai Bo , Zhao Hui
Published: August 2013

Resonant micro-accelerometers have good properties such as the large dynamic range, the high sensitivity, the strong anti-interference ability as well as the direct digital output. A new z-axis resonant micro-accelerometer based on electrostatic stiffness is researched. The new z-axis resonant micro-accelerometer consists of a torsional accelerometer and two plane resonators. The sensing movement of the accelerometer is decoupled with oscillation of the plane resonators by electrostatic stiffness, which will benefit to improve the performance of the new z-axis resonant micro-accelerometer. The new structure is designed. The sensitive theory of the acceleration is investigated and the equation of scale factor is deduced under ideal conditions. The simulation is implemented to verify the basic principle by the Ansys and Matlab. The structure simulation results prove that the effective frequency of the torsional accelerometer and the resonator are 0.66kHz and 13.3kHz separately. And the interference modes are isolated with the effective mode apparently. The system simulation results indicate that the scale factor is 37Hz/g and the system has excellent capabilities in locking and tracking natural frequency of resonators, which proves that the basic theory is feasible.
Design of Tools Flow Based on Reusable Scheduling in FMS
Authors: Bian Pei Ying
Published: August 2013

According to importance of the tool in the modern production,on the basis of tool-flow analysis, this thesis establishes reusable scheduling strategy. In this scheduling, it established a tool information management system based on the central tools magazine. The system includes the main information of each of the tools such as: number, location, usage, current state etc, and for them makes on real-time monitoring and anomalies reporting. Besides a priority mechanism is formulated for multi-tool and multi-task in the scheduling. Finally, the reusable scheduling has been modeling and simulation. To run the emulation program proved that the real-time and effectiveness of the tool management system, and the result of running is analyzed under configurations include the number of different tool, which for the actual production scheduling of tool provides the algorithms and software platforms.
Research on the Influence of Wind Energy on New Energy Utilization Coefficient of EEDI
Authors: Li Cai Ling , Zhou Song , Han Ye
Published: August 2013

Currently, the emissions discharged by ships are becoming more and more serious, which brings a great harm to the atmospheric and marine environment. In order to solve the emissions, especially of CO2 emission, the new ship energy efficiency design index (EEDI) has been introduced to reduce it. According to EEDI calculation formula, the use of new energy technology can reduce marine EEDI. Nowadays, wind energy as a clean and renewable energy, is an ideal alternative energy to be applied on ships. But until now, there is still no definite calculation formula and value regulation to parameters involved in the application of new energy on ships, including new energy utilization coefficient.
An Improved Model Reduction Method and its Application in Similar Simulation of Complex Systems
Authors: Wang Ai Lun , Wang Qian Jin
Published: August 2013

The model reduction methods aim at simplifying system model while retaining system dynamic behaviors. In this study, an improved high-order system model reduction method based on modal aggregation is proposed, and which is applied to a typical complex mechanical system. Compared with general model reduction methods based on aggregation method, this method derived from the modal matrix can get more accurate aggregation matrix. The research on natural characteristic of gas turbine blade-disk shows that the reduced-order model obtained by modal aggregation method retains the dynamics of original complex system, which verified feasibility and effectiveness of the modal aggregation reduction method and also provided an easy method for similar simulation modeling and dynamic characteristic analysis of high-order complex systems.
Research on Fixturing Method of Marine Crankshaft Finish Machining
Authors: Cao Shou Qi , Zhao Yang , Zhang Li Zhen
Published: August 2013

For marine engine, the quality of the crankshaft is a decisive factor for its mechanical life. In the manufacturing processes of semi-built-up marine crankshaft, as the final process, finish machining of the entirety is vital to the machining accuracy. Applying finite element method, the traditional way for fixturing is analyzed and the problem of machining deformation because of poor rigid and great weight is pointed out. In addition, a new fixturing method is put forward according the structure characters of crankshaft, which provides a technical support for practical machining and theoretical principle of fixturing method for extreme manufacturing. Moreover, a further research direction to increase the fixturing and adjustment efficiency is proposed.
Study on Cyclic Voltammetry in Na3AlF6-Al2O3-LiF Molten Salt Electrolysis
Authors: Tao Shao Hu , Di Yue Zhong , Peng Jian Ping , Zhao Kun , Feng Nai Xiang
Published: August 2013

Electrochemistry reaction of the Al3+ by means of cyclic voltammetry. The results show that the Al3+ was reduced to Al metal in a single step. During the electrochemical process, metal Na and Li did not deposit out on tungsten electrode. After adding LiF, the oxidation peak of Al was weakened and the oxidation quality of Al decreased. Compared with cyclic voltammetry curves at different CR ratio (CR=molar ratio of NNaF/NAlF3 in the bath), LiF is more effective in the low CR system for electrolyte. The XRD analysis shows that Li-Al alloy was soluble in the molten salt while Li + and Al3+occured alloying reaction.
Hydrolysis of BNPP Catalyzed by the Dodecyliminodiacetate Nickel (II) Complexes
Authors: Li Shen Xin , Hu Wei , Wang Ying , Wu Song
Published: August 2013

One novel dodecyliminodiacetate nickel (II) complex were synthesized and characterized, and these complexes were used as mimic hydrolytic in catalytic hydrolysis of bis (p-nitrophenyl) phosphate (BNPP). The analysis of specific absorption spectra of the hydrolytic reaction systems indicated that the catalytic hydrolysis involved the key intermediates formed by BNPP with nickel (II) complexes. The kinetic parameter of BNPP catalytic hydrolysis has been calculated and the activation energy for the catalytic hydrolysis is 95.26kJ·mol-1.
Role of Tool Size in Suppressing Defects in SPIF Process
Authors: Hussain Ghulam , Hashemipour Majid , Iqbal Asif , Khalatbari Hosein
Published: August 2013

In the present work, the role of tool radius in suppressing forming defects in SPIF process is investigated. It is shown that a strong correlation exits between tool size and defect appearance. Moreover, there is a certain limit on choosing low limit of tool size for defect-free forming. A formula has been proposed to asses this limit under varied forming conditions.
Pre-Heat and Start-Up Process of High Temperature Proton Exchange Membrane Fuel Cell
Authors: Song Man Cun , Pei Pu Cheng , Li Peng Cheng , Zeng Xia
Published: August 2013

High temperature proton exchange membrane fuel cell (HT-PEMFC) advances the applications of fuel cells in automobile applications, and smooth start-up is one of the critical topics in researches. This work utilizes four pre-heat fluid mediums, i.e. water, silicone oil, liquid paraffin and air, to examine the pre-heat and start-up performance of single HT-PEMFC. Experimental temperature data at 10 different locations on upper side of bipolar plates matches well with that of simulation. The results show preheating in liquid phase meets the requirements of start-up, but leads to instability in the system. So liquid cannot be employed for pre-heat. On the contrary, preheating by gas phase will achieve good start-up performance, and may be used for hybrid electric vehicle (HEV).
Theory of Direct-Transition Optical Gain in a Novel n+ Doping Tensile-Strained Ge/GeSiSn-on-Si Quantum well Laser
Authors: Fan W.J.
Published: August 2013

The band structure and optical gain of a novel n+ doping tensile-strained Ge/GeSiSn quantum well are investigated by using an 8-band k·p method. The doping effect in Ge quantum well and the effect of the carrier leakage into L valley on the optical gain will also be considered. The E-k dispersion curves and optical gain spectra will be obtained and discussed.
Quasi-Static Simulation of Crack Propagation on Elastic Material with Material Discontinuous Zone
Authors: Sun Zhi Jia , Li You Tang
Published: August 2013

A numerical method to simulate the crack propagation based on the maximum circumferential stress theory is presented in this paper. The FEM method is used to estimate the influence of the material discontinuous zone on the propagation path of the crack placed in close to it in the matrix. When the crack grows, the FEM method uses the maximum circumferential stress theory to determine the propagation direction and the elements re-meshing program to ensure the accuracy of the crack-tip stress field. The crack propagation paths in the matrix with different material zone are simulated by the method. The simulation results show that the property of the material discontinuous zone influences the maximum deflection angle and its size influences the length of the deflected crack path.
Using Particle Systems to Model the Building Materials
Authors: Korolev Evgeniy Valerjevich , Smirnov Vladimir Alexeevich
Published: August 2013

Escalating the operational actions in construction demands the development of building materials with improved properties. Today, the nanomodified and nanostructured materials (also called nanocomposites) attract great attention of the scientists all over the world. The successful development of nanocomposites requires simultaneous application of theoretical examination, experimental investigations and numerical studies. In the present work we provide short review of the simulation methods involving particle systems as a materials model and also discuss several results obtained during numerical studies of building materials by means of using such methods. It is noted that neither the single mathematical model, nor the only one simulation method can be used for modeling of building material at all levels of scale (from macroscopic down to nanoscale). However, some models and numerical methods are still quite general. Thus, they can be utilized for modeling a very wide range of phenomena from compaction process at macroscopic level to reinforcement regularities at micro-and nanoscale. The obtained results both offers the insight into regularities of structure forming process and allow to reduce time and cost of the design.
Gel Engineering Materials Meso-Decorated with Polymorphic Crystals
Authors: Gong Jin , Igarashi Susumu , Sawamura Kensuke , Makino Masato , Hasnat Kabir M. , Gong Jin
Published: August 2013

Gels are a new material having three-dimensional network structures of macromolecules. They possess excellent properties as swellability, high permeability and biocompatibility, and have been applied in various fields of daily life, food, medicine, architecture, and chemistry. In this study, we tried to prepare new multi-functional and high-strength gels by using Meso-Decoration (Meso-Deco), one new method of structure design at intermediate mesoscale. High-performance rigid-rod aromatic polymorphic crystals. The strengthening of gels can be realized by meso-decorating the gels structure using high-performance polymorphic crystals. New gels with good mechanical properties, novel optical properties and thermal properties are expected to be developed.
Crack Extension Resistance of Post-Fire Concrete
Authors: Lu Zhou Dao , Chai Ji Feng
Published: August 2013

Wedge-splitting test is carried out in present research.Determination of the residual crack extension resistance curves (KR-curves) associated with cohesive force distribution on fictitious crack zone of complete fracture process is implemented. In each temperature, with the distribution of cohesive force along the fracture process zone, the residual fracture toughness KR (Δ̱) increases with increasing crack length Δ̱. Whereas the KR-curves decrease with increasing temperatures Tm for the thermal damage induced.
Effect of Heat Treatment on Mechanical Properties of General Purpose Stainless Steel Archwire
Authors: Churnjitapirom Pornkiat , Wasumetharatsamee Aksarin , Dechkunakorn Surachai , Anuwongnukroh Niwat , Suddhasthira Theeralaksna , Tangit Nathaphon
Published: August 2013

Stainless steel has been used for orthodontic application and its properties have been continuously improved. The present study compares the mechanical properties of general purpose stainless steel archwire after heat treatment with commercial heat and non-heat treated stainless steel archwires (Highland, USA). The six parameters compared included: 1) maximum strength (MPa) 2) bending modulus (GPa) 3) bending stiffness (N/mm) 4) 0.1 offset bending force (N) 5) 0.2% offset yield strength (MPa) and 6) springback. The temperatures of heat treatment were 200°C, 250°C, 300°C and 350°C at various time duration of 10, 20 and 30 minutes. Fifteen specimens were used for each of the 12 temperature/time settings to evaluate each parameter. An Instron Universal Testing Machine was used for the three-point bend testing and the diameters were measured by a micrometer. Of all 12 settings it was found that for the condition, 300°C at 10 min and 300°C at 20 min the mechanical properties were closest to the commercial (Highland, heat-treated) stainless steel archwire and appropriate for used in clinic.
Effect of Ti on the Microstructures and Toughness of TMCP-600 Steel Weld Metals
Authors: Koh Jin Hyun , Jang Bok Su
Published: August 2013

The Ti addition effect on the characteristics of weld metal, such as impact energy, microstructure and nonmetallic inclusions, was investigated to develop a suitable gas metal arc welding wire for the high strength of TMCP (Thermo Mechanical Control Process)-600 steel. The fraction of acicular ferrite which was known to be a favorable weld metal microstructure for toughness was increased with Ti content from 0.002% to 0.025%, The impact energy of weld metal was increased whereas the ductile to brittle transition temperature was decreased with increasing Ti content. The size of nonmetallic inclusion was decreased while the density of inclusions was decreased with increasing Ti content. It was found that Ti content on the weld metal toughness had a plus effect by increasing the fraction of acicular ferrite in the weld metal microstructure.
The Influence of Electromagnetic Stirring on Primary Structure of Pure Al and Al-Si Alloy
Authors: Wróbel Tomasz
Published: August 2013

In paper problem concerning inoculation of primary structure of Al with purity of 99,5% and 99,8% and AlSi2 alloy, which is realized mainly by intensification of liquid metal movement in mould is presented. In aim of realization of forced movement during the crystallization of liquid metal was used horizontal electromagnetic field produced by the induction coil (stirrer) supplied by current with elevated frequency. The degree of structure refinement was represented mainly by equiaxed crystals zone content on transverse section of ingot and average area of macro-grain in this zone. Effect of structure refinement obtained by influence of electromagnetic stirring was compared with refinement obtained by use of traditional inoculation, which consists in introducing of additives i.e. titanium, boron and strontium to metal bath. The results of studies and their analysis show possibility of effective refinement of pure Al and Al-Si alloy primary structure, only with use of horizontal electromagnetic field and without necessity of application of inoculants such a Ti and B. This method of inoculation is important, because inoculants decrease the degree of purity and electrical conductivity of pure Al. Moreover inoculants are reason of point cracks formation during rolling of ingots.
Research on the Process of Iron-Bearing Dust's Self-Reduction to Produce Iron Nuggets
Authors: Tang En , Liang Xue Zheng , Li Ju Yan , Zhou Qiang
Published: August 2013

Under normal temperature iron-bearing dust was mixed with coal and compacted to form pellets as per different ratio. After pellets were self-reduced in carbon tube furnace, the influence of C/O ratio, slag basicity, temperature on the separating behavior of metal phase from slag phase, metallization rate, dephosphorization and desulphurization rate was studied. The results indicate that self-reduced products can spontaneously separate when slag basicity is more than 1.8. The optimum inner ratio of C/O and slag basicity for complete separation of iron and slag is 1.1 and 2.0 respectively. Under those conditions and temperature at above 1350°C, such results that product can reach: iron yield is more than 95%, iron nuggets within size of 5~20mm is more than 80% and desulphurization rate is more than 85%.
Pyrometallurgical Processing of Copper-Smelting Slags
Authors: Stadnichenko Dmitriy V. , Ten Edis B. , Krasnov Vladimir N. , Shangin Eugeniy A. , Volkov Vladimir A. , Shangin Andrey A.
Published: August 2013

t is considered an actuality and problems of the Copper-smelting slags processing. It is formulated the demands, which the slag processing technology must to conform. It is given the ground for preferableness of the pyrometallurgical method, which it is caused the next factors: a) variety of slag composition, forming on the Copper founding plants and b) necessity of its selective proceeding with using the individual technology regimes. It is offered the two stage technology for Copper slag pyrometallurgical processing, which allows to extract from slag the metallic part during the separating smelting, and during the reducing smelting to extract the metallic components from nonmetallic part, where its presents at the chemical combined condition. It is presented the experimental dates about output of metal during the every smelting stage and the kinetic of reducing extraction.
Design of Melt-Ejection Nozzle in Horizontal Twin-Roll Casting of Al-1100 by Finite-Element Analysis
Authors: Park Jong Jin
Published: August 2013

Horizontal twin-roll casting is utilized to produce thin strips of light metals, suchas aluminum or magnesium alloys. However, since the melt flow in the roll gap is asymmetric due to the gravity, microstructure distributions become asymmetric resulting in uneven mechanical properties. In the present investigation, the nozzle for ejecting the melt of Al-1100 was designed and improved for the melt flow to be symmetric by finite element analysis.
Study on the Design Application of Product Materials — An Example of Smartphone Display Stand
Authors: Li Hong Hai , Liang Jung Chin
Published: August 2013

The paper aims to study on the production materials and the quality design of smartphone display stand. Through the consensus opinions provided by experts, the study on identification and material attributes, such as strength, rigidity, toughness, use, value, durability, productive and low cost, of design applications of display stands can be achieved. Then the emphasis on choosing each material toward product design requirement can be understood, and the correct material application principles can also be provided. The mathematics model of GM(h,N) in the grey system theory is used to analyze the weighting of influence factors. Next, the order of importance of material factors can be calculated, which is able to promote the selection of smartphone display stand production materials. Finally, it can be a systematic selection structure to resolve the difficult material design application problems. By using the practical math analysis, the results can be the reference to the study on field in the future.