bluuebunny/crossref_metadata_2025 huggingface dataset:
A New-Style Efficient Heat-Pipe Heat Exchanger on Flue Gases
Authors: Wang Qing Cheng
Published: February 2012

A new-style efficient heat-pipe heat exchanger on flue gases has been designed and made in Shanghai Institute of Technology. The heat transfer efficient of the heat-pipe heat exchanger is high; its structure may be changed according the parameters of different flue gases; it may also be used conveniently by advantageous installation; most parameters of the heat-pipe exchanger may be measured and saved. This new-style efficient heat-pipe exchanger will be widely used in many areas in industry.
CFD Analysis of Wind Loads on Permeable Low-Rise Structures
Authors: Janajreh Isam
Published: February 2012

Current screen enclosure building codes are based on the experimental wind tunnel studies and, to a smaller extent, full scale open terrain studies conducted at Virginia Tech and Clemson University. There are still widespread wind damages to pool and patio enclosures during wind storms. Experimental studies based on simulation comparison of wind load on a low-rise structure in general, continue to show large discrepancies based on NIST data. Accounting for the many parameters which are essential to achieve an accurate simulation through experimentation is daunting. Reynolds number, spectrum density, large and small turbulent scales, viscous shear layer, and flow intermittency are a few of those parameters. Numerical simulation (CFD) provides an attractive parametric study and offers a richer, higher resolution data output. In this work, flow around a screen enclosure embedded within the atmospheric boundary layer is investigated numerically. The flow is governed by Navier-Stokes equations with a momentum sink that follows Darcy equations and incorporating the eddy viscosity k-ε turbulent closure model. The pressure drop that is computed provides the basis of evaluating wind load on the screen structure. The evaluated load is compared to the Florida Building Code ASCE7 provision and is used to conduct structural analysis on common baseline enclosures to assess their reliability. The structure is analyzed using Bernoulli-Euler beam elements having cross sections according to the code and subjected to forces and moments with 6 (3displacements and 3 rotational) degrees of freedom.
New Approaches for Network-Based Control Systems with Time-Varying Delays
Authors: Liu Zhong Min , Feng Yi Wei , Luo Dong Song
Published: February 2012

In this paper, a delay distribution based stability analysis and synthesis approach for networked control systems (NCSs) of network communication delays is proposed. A bounded delay control model is established to describe the NCSs. Then, delay distribution-dependent NCSs stability criteria are derived in the form of linear matrix inequalities (LMIs). Also, the problem of HΚ performance analysis for NCSs with time varying delays components is also studied. The results are illustrated by numerical examples.
Study on Bonding Properties of Copper and Aluminum in Nano Scale Using Molecular Dynamics Simulation
Authors: Hsu Quang Cherng , Cheng Yen Yu , Liu Bao Hsin
Published: February 2012

According to MD simulation results, pressing depth between two bonding materials will affect bonding strength. Alloy material (Al0.9Cu0.1) had void defect phenomenon in low bonding speed condition because the increasing chance of atom migration which will result in low bonding strength. High tensile speed causes material fracture phenomena happen earlier than low speed. Material stress in low speed is smaller than in high speed. Fracture morphology of material is different in different tensile speed. In low speed condition, material can be stretched thinner than in high speed condition. Material in high temperature has greater kinetic energy than low temperature; therefore, material in high temperature has better formability and behaves larger tensile strain than low temperature. For pure aluminum, when temperature raises to 900K which is close to melting point (933K), its crystal structure is no longer belongs to F.C.C. structure, so bonding strength is weaker than low temperature. Large size material has larger contact area than small size material; therefore, the tensile force and tensile strength of the former are larger than the latter. The order of bonding strength for these three materials is: binary alloy > pure copper > pure aluminum.
A Delay-Constrained Multicast Routing Balanced-Optimization Algorithm of Link-Sharing
Authors: Liu Wei Qun , Chen Xiang Kui
Published: February 2012

In multimedia network, Quality of service (QoS) provisioning generally assumes more than one QoS measure which implies that QoS routing can be categorized as an instance of routing subject to multiple constraints: delay, cost, bandwidth, etc. We study the problem of constructing multicast trees to meet the QoS requirements of real-time applications where it is necessary to provide bounded delays among the source and all destinations while keeping overall cost of the multicast tree low. So the cost and computational complexity are analyzed as constructing delay-constrained multicast tree. So as to optimize shortest paths, a new algorithm of ORLSB(optimal routing algorithm for link-sharing balance) is proposed.The link selection function of the algorithm not only considers the priority of the destination nodes, but also takes into account the priority of the low delay path based on local information. Because the multicast tree has fewer possible path, the algorithm reduces the probability of creating multicast tree through the minimum delay path and improves the sharing paths. Simulation results show that this algorithm has balanced cost, delay and computational complexity, and has better overall performance.
Digital Noise Generator Based on Bernoulli Chaotic Map
Authors: Martínez-González Ricardo Francisco , Díaz-Méndez José Alejandro , Rojas-López César Enrique , Vázquez-Medina Rubén
Published: February 2012

This paper describes the noise emulation in materials through the digital implementation of a chaotic noise generator based on the Bernoulli map. The bifurcation diagram, Lyapunov exponent and the Ergodic Theorem were used in order to determine the operation conditions under which the Bernoulli map is able to generate noise with different statistical distributions. A 32-bits digital circuit was designed and implemented in a FPGA, and it can be used to emulate and analyze the noise in different materials. The obtained results are consistent with the generalized Bernoulli map behavior.
The Study on College Library Knowledge Service
Authors: Wu Jian Jun , Cai Fu Rui
Published: February 2012

Most domestic studies of KS are from the library and information fields, research focus on the mode of KS and the related technologies, as well as the strategy of carrying out KS, and so on. This article explains the meaning and the features of college library knowledge services (KS), and analyzes the situation of KS in Chinese college libraries. This paper will analyze the situation of KS in domestic college libraries, point out the problems, and propose optimization strategies.
KTX Interior-Noise Reduction Performance Comparison Using Multichannel Active-Noise Control
Authors: Jang Hyeon Seok , Kim Young Min , Kim Saehan , Lee Taeoh , Lee Kwon Soon
Published: February 2012

In many countries, the use of the KTX high-speed rail has been generalized of late. Therefore, its customers who initially pursued only convenience and speed have begun pursuing quality services such as comfort and stability. Thus, the importance of reducing the noise in the high-speed rail is increasing. The active noise is best choice to reduce noise because of being able to actively reduce the ambient noise coming from the environmental-factor changes. But it’s too hard in a three-dimensional closed-space sound field such as the interior of a high-speed rail. In this study, we used multichannel(2x2) FXLMS algorithm for applying ANC system in KTX. In detail, after measuring the noise inside KTX during its runs in South Korea, multichannel active noise control was simulated to determine the extent to which it can reduce the noise inside KTX. Simulation was done using a multichannel FXLMS algorithm for reducing the actual noise inside KTX and the noise reduction in the open-space section of KTX was compared with that in the tunnel section, and the active-noise-control performances in the low-frequency (below 500 Hz) region were compared.
Research on the Application of Fuzzy Neural Network in the Tobacco Heights Department of Tractor Reliability
Authors: Men Yan Zhong , Zou De Tang
Published: February 2012

The data of engine failures about tobacco Heights Department of tractor operating in field conditions was collected by running engine failure tracking tests. An evaluative model was established using the theory of Fuzzy Neural Network(FNN) for the tractor ' using reliability, based on the data of failures about tractors, the observed values of the reliability standards were made out and the degree of subordination was figured out, finally, the evaluative result for the tractors ' using reliability was obtained by evaluative model of reliability. The result of research can be used as references for the improvement of reliability and maintainability of tractor engines, and for the establishment of maintenance strategy, and it also lay a theoretical foundation for studying the improvement of evaluation method for the tobacco Heights Department of tractor ' reliability as well.
Experiment Research on Activated Cement
Authors: Zhang Qing , Cheng He Ming , Cao Jing , Song Zhi Gang , Gui Yue
Published: February 2012

Activated cement with the characters of low water demand and high activity was made with Portland cement clinker and dehydrate-gypsum and liquid superplasticizer which were used as grinding additive in the grinding process. Three states of grinding effect exist with correspondence of different dosages of super-plasticizer: the optimal grinding aid dosage, the critical dosage, and the supercritical dosage. First, under the condition of the optimal grinding effect, the activated cement had the maximum strength with little dosage of super-plasticizer and small effect on the performance of activated cement; second, within the critical dosage, the strength of activated cement was similar to the common cement, more super-plasticizer were held and the performance of cement was obviously improved; third, within the supercritical dosage, the strength of activated cement was reduced, but it can accommodate much super-plasticizer, and had a remarkable influence on the performance of cement. The experiment also shows that different properties of low water demand activated cement can be made with admixture of different concentrations of super-plasticizer. Within the allowed limit, use more admixtures was in compile with green environmental protection concept, improve the durability of concrete, and resolve the problem of compatibility between common cement and super-plasticizer, and offered technical support in the produce of commercial concrete by directly use of Portland cement clinker.
RETRACTED: Ignition and Combustion of Magnesium Particles in Carbon Dioxide
Authors: Zhang Sheng Min , Hu Chun Bo , Xia Sheng Yong , Li Lin , Wei Xiang Geng
Published: February 2012

RETRACTED ARTICLE: Metal-CO2 propulsion is less known than in-situ resource utilization (ISRU) technologies. This concept, based on using Martian carbon dioxide as an oxidizer in jet or rocket engines, offers the advantage of no chemical processing for CO2 and thus requires less power consumption than ISRU alternatives. In this paper, we study the burning behavior of the Mg in a CO2 atmosphere to assess the feasibility of using Mg/CO2 reactions as an in situ resource utilization technology for rocket propulsion and energy generation on other planets. From the experimental results, we can see that the critical ignition temperature increases with increasing the particle size and decreases with increasing the ambient pressure. In the CO2 atmosphere, we found the complicated sequence of interaction modes including pulsating combustion in a wide range of ambient temperatures. The pulsation frequency is determined by the sample temperature at the phases of slow heterogeneous combustion between the flashes. The combustion mechanisms are discussed with consideration of processes in both a surface film and gas phase.
Microstructure and Glass-Transition Temperature of Novel Sn-SIBR
Authors: Xu Yi Bing , Yu Guo Zhu , Xu Lin , Li Chuan Qing
Published: February 2012

A novel Tin-functionalized integrated rubber of styrene-isoprene-butadiene (St-Ip-Bd) tri-copolymer (Sn-SIBR) was prepared by anionic polymerization using self-made tin-containing organolithium (SnLi) as initiator, tetrahydrofuran (THF) as polar modifier, and cyclohexane as solvent. The microstructure and the glass-transition temperature (Tg) of tri-copolymers were characterized by 1H NMR and differential scanning calorimetry (DSC), respectively. The result shows that the non-1,4-structure content and the Tg of tri-copolymers increased with the increase of THF dosage and the initiator concentration or the decrease of polymerization temperature. We also obtained the relationships between the ln(T/Li)( THF/ SnLi, mole ratio) and the non-1,4-structure content, the non-1,4-structure content and the Tg of copolymers, respectively.
Densification Process of WC-MgO Nanocomposite Based on Master Sintering Curve
Authors: Ouyang Chen Xin , Zhu Shi Gen
Published: February 2012

The master sintering curve (MSC) of nanocomposite WC-MgO was constructed based on the combined-stage sintering model. Nano-sized WC-4.3wt%MgO powder with average particle size of 35nm was synthesized by high-energy ball milling, and then uniaxially pressed at the pressure of 500MPa to fabricate green compacts. The shrinkage response of the compacts, used to construct the master sintering curve, were studied by dilatometric runs at two constant heating rates of 5°C/min and 10°C/min up to 1900°C. Using the estimated activation energy, the master sintering curves were established and compared to acquire an optimum value (Q=361.8 kJ/mol). The obtained MSC was validated by non-isothermal sintering with the identical green compacts. The results demonstrate that the MSC can be applied successfully to predict and control shrinkage level and final density during heating up regardless of heating rates.
Simulation on the Slag Pool Flow Field in the Electroslag Casting Process
Authors: Yao Jun Ping , Sun Zhong
Published: February 2012

The flow of the molten slag pool determines the temperature distribution and the pool profiles in the electroslag casting process, which impact on the quality of ingot casting. The flow field of the molten slag pool in the electroslag casting process was simulated by the large-scale finite element analysis software ANSYS, the result of which was completely in accordance with the physical simulation results. It was discussed that the influence of the molten slag flow field was caused by the current, the filling scale and the angle of electrode taper, which provided the scientific basis for the produce of the electroslag casting.
Parametric Study on Rectangular Sonic Crystal
Authors: Gupta Arpan , Lim Kian Meng , Chew Chye Heng
Published: February 2012

Sonic crystals are periodic structures made of sound hard scatterers which attenuate sound in a range of frequencies. For an infinite periodic structure, this range of frequencies is known as band gap, and is determined by the geometric arrangement of the scatterers. In this paper, a parametric study on rectangular sonic crystal is presented. It is found that geometric spacing between the scatterers in the direction of sound propagation affects the center frequency of the band gap. Reducing the geometric spacing between the scatterers in the direction perpendicular to the sound propagation helps in better sound attenuation. Such rectangular arrangement of scatterers gives better sound attenuation than the regular square arrangement of scatterers. The model for parametric study is also supported by some experimental results.
Probabilistic Fatigue Crack Growth in Compact Tension Specimens from FSWed 7075-T651 Aluminum Alloys
Authors: Kim Seon Jin , Jeong Yeui Han , Sohn Hye Jeong
Published: February 2012

The process of fatigue crack growth is generally random nature, due to many sources of variability, such as external loading, material properties and geometry conditions. Therefore is is important to investigate the statistical variability of fatigue crack growth in order to development the methodology for probabilistic fatigue crack growth life prediction. This paper is concerned with the randomness investigation of fatigue crack growth for the FSWed 7075-T651 aluminum alloys. In this investigation, the fatigue crack growth tests were conducted for five compact tension (CT) specimens of the FSWed 7075-T651 aluminum alloys, base metal (BM), heat affected zones (HAZ) and weld metal (WM), especially three different constant stress intensity factor range (SIFR) controls.
FEM Simulation of the Slab Edge Rolling in Unsteady Rolling Stage
Authors: Ren Rui , Zhang Xiao Ping , Du Xiao Zhong
Published: February 2012

According to characteristics of adjusting width by vertical roll at a certain steel corporation, unsteady deformation of head and tail of slab during edge rolling was analyzed by FEM simulation on base of a commercial software. The effect of several process conditions on the cross-section deformation and width loss of slab were also analyzed.
Analysis of Hot Working Characteristics of Aluminium Based Composites Using Response Surface Methodology
Authors: Ramesh Balakrishnan , Senthilvelan Thiyagarajan
Published: February 2012

During deformation process, it is essential to control the formability parameters viz., stress, strain, temperature, aspect ratio, volume fraction etc., to obtain sound and defect free products. Moreover, in deformation process in general, upsetting in particular, conducting too many trail experiments results in increased experimental time and cost. Hence modeling of process parameter attracts attention of researchers. The objective of modeling the process parameters is to determine which variables are most influential during metal forming operations. In the present investigation, by connecting the influential process parameters during metal forming in general upsetting in particular, a mathematical model have been developed using Design of Experiments (D.O.E) which could be applied to estimate the flow stress. Aluminium MMCs with silicon carbide (SiCp) and aluminium oxide (Al2O3) as reinforcement have been chosen in this current study as it has significant advantage over conventional materials.
Study on Electric Contact Heating for Nodular Cast Iron 600-3
Authors: Qi Xiao Ben , Zhu Shi Gen
Published: February 2012

The method of electric contact heating for nodular cast iron was based on the application of the contact resistance heating between the electrode and work piece to change the characteristics of the surface. The effects of processing parameters on the width and depth of modified layer were analyzed, and among the experimental factors, the electric current had the largest effect than the others. Optical microscope was used to describe the microstructure transformation and identify the phases in the modified layer. Results showed that a cementite-martensite microstructure in the melted zone and a martensite-ledeburite-ferrite microstructure with graphite nodules in the hardened zone have been observed; especially two typical hardened shells around graphite are achieved in the hardened zone, which are ledebruite-martensite shell and single martensite shell around graphite. The effects of the changed microstructures were additionally verified by microhardness measurements in the modified zone. The microhardness of the nodular cast iron was found to be significantly increased after electric contact heating.
Computerized Sheet-Metal Inspection Based on the Cross Network Communication
Authors: Suzuki Takamasa , Sato Kotaro , Muramatsu Shogo , Murata Mitsuyoshi , Oitate Toshiro
Published: February 2012

A non-traditional processing cycle for sheet-metal working based on the computerized image processing techniques is proposed. This novel system enables the effective fabrication cycle that realizes automatic inspection, quick delivery, and cost reduction.
Investigation on the Effect of Infilled Walls Utilizing Response Spectrum Analysis for Steel Staggered-Truss System
Authors: Guo Qing Sheng , Yang Qing Shan
Published: February 2012

Considering the structure type of the steel staggered-truss (SST) system, the effect of infilled walls will be major and need to be studied amply, some scientific design regulations need to be found for referrence. Based on two different 3D models considering or ignoring the stiffness of infilled walls (SIW), a numerical investigation is presented on the structural behaviors of the SST system utilizing the finite element 3D simulation analysis soft ware ETABS. The longitudinal structure is asymmetrical due to the SIW, it causes the torsion forces in the building. Comparing to the different results of response spectrum analysis, including storey drift and equivalent base shear under frequent earth quake and rare earth quake, some conclusions were made, including the capacity of the SST system under seismic load and the effect of the SIW for SST system. The increased base shear force factors due to the effect of the SIW were suggested for SST structure design, it is different from the other steel structure types.
Theoretical Calculation of the Polytypism Transition Temperature of Titanium Alloys on the Valence Electron Level
Authors: Qu Hua , Liu Wei Dong
Published: February 2012

Based on the polytypism transition temperature(PPT) of pure titanium, the the empirical electron theory of solids and molecules(EET) and the basic theory of the phase transformation of titanium alloys, a new method to calculate the PTT of titanium alloys is put forward after calculating the valence electron structure(VES) parameter nA which is the covalence electron pairs on the strongest bond of alloy phases, the crystal cell weight of  and  phases in the structure, the compensation coefficient of the phase and the temperature coefficient of  stable element. After calculating the PTT of some common titanium alloys, we find that the theoretical values are consistent with the experimental ones, so it is feasible to calculate the polytypism transition temperature of the titanium alloys on the covalence electron level.
Pressure Response of Polymer Flooding Reservoir by Considering Diffusion and Conduction Behaviors
Authors: Nie Xiang Rong , Cheng Shi Qing , Zhao Yong Jie , Zhang Ying
Published: February 2012

A polymer solution is classified as non-Newtonian Fluid. The results of pressure data analysis for polymer flooding reservoirs would be inaccurate when generalized using non-Newtonian fluid flow models, which treat polymer solution as power law fluid. To improve analysis results, a study to create new pressure interpretation models for polymer flooding reservoirs is needed. First, this study presents a new viscosity model by considering diffusion and conduction. Then the model is applied to set up a new model of an injection well located at an infinite polymer flooding reservoir. The modeling solutions have been prepared through numerical iterations. An extended study has been done about the characteristics of the new pressure response curves.
TEM Analysis and Corrosion Resistance of the Ceramic Coatings on Q235 Steel Prepared by Hybrid Method of Hot-Dipping Aluminum and Plasma Electrolytic Oxidation
Authors: Lu Li Hong , Shen De Jiu , Zhang Jing Wu , Guo Chang Hong
Published: February 2012

The hybrid method of plasma electrolytic oxidation (PEO) and hot-dipping aluminum (HDA) was employed to deposit composite ceramic coatings on the surface of Q235 steel. The cross-section microstructure and surface morphology of the treated specimens were investigated with scanning electron microscopy (SEM). Especially, the composition of the composite coatings was investigated with transmission electron microscopy (TEM). The corrosion resistance was analyzed by immersing and corrosion polarizing experiments. The results indicate that metallurgical bonding can be observed between the ceramic coatings and the steel substrate. There are many micro-pores which act as discharge channels in the PEO coatings. The phase composition of the ceramic coatings is mainly composed of amorphous phase and crystal Al2O3 oxides. The crystal Al2O3 phase includes κ- Al2O3, θ- Al2O3 and β- Al2O3.The corrosion resistance of the PEO samples is much better than that of the HDA samples whether immersed in the NaCl solution or in the sea water.
Stability of High Speed Milling Based on Instantaneous Cutting Force
Authors: Zhou Hong Liang , Tang Wei Xiao , Song Qing Hua
Published: February 2012

High-speed milling (HSM) has advantages in high productivity high precision and low production cost. Thus it can be widely used in the manufacture industry. However, when the speed of spindle-tool reaches a higher speed range, the gyroscopic effect will become an important part of its stable milling. In this paper, a dynamics model of HSM system was proposed considering the influence of gyroscopic moment due to high rotating speed of end milling. Finite element model (FEM) is used to model the dynamics of a spindle-milling system. It obtains the trajectory of central point in face milling with considering gyroscopic effects through the dynamics model at high speeds. Then the cutting force model will be corrected by the trajectory of face milling. Then the stability lobes diagrams (SLD) was elaborated. Cutting thickness effects have non-negligible impact on stability limitation.
Error Analysis in Multistage Machining Process Using Kinematic Analysis of Workpiece Fixturing
Authors: Abedini Vahid , Shakeri Mohsen , Siahmargouie Mohammad Hasan
Published: February 2012

Fixtures are used to locate and hold workpieces with locators and clamps. As well as having a locating function, fixtures must also ensure that the dimensional quality of the manufactured workpiece can be achieved. Inaccuracies in fixture’s location scheme result in a deviation of the workpiece from its nominal specified geometry. A “multistage” machining process refers to a part that is machined through different setups. At multistage machining, the errors of pervious stages are transferred to next stages. In this paper, an analytic model is developed to integrate the errors in each stage and accumulated error of pervious stages. This model has great potential to be applied toward fault diagnosis and process design evaluation for the multistage process. A mathematical model is developed by the kinematic analysis of the fixture using Jacobian matrix and homogeneous transformation matrix (HTM). The effectiveness of the resultant deviation model is verified by example.
Efficiency of Pollutants Removal in Košice Area with Respect of Living Quality Increasing
Authors: Pavolová Henrieta , Csikósová Adriana , Čulková Katarína , Antošová Mária
Published: February 2012

The qualitative condition and development of the environment in the Košice region is clearly affected by any activity within social development. Anthropogenic activities, especially in the manufacturing industry, negatively impact on the individual components of the environment in particular emissions of contaminants into air, water, soil and rock environment, also due to accidents, waste production and also by remote of agricultural land. It should be noted that among various components of the environment are very tight feedback and mutually influence each other and therefore any decrease in quality of one component as a result of contaminants introduction leading to disruption of ecological balance is automatically reflected in other components of the environment. Increasing the intensity of anthropogenic activities is taking place on one side an increase of environmental burdens through the issuance of a wide range of contaminating substances and exploitation through natural resources which is a manifestation of deterioration of the productivity of the country, of its hygienic and aesthetic values, and on the other side increase in economies may foster environmental protection to finance any corrective measures or to help prevent pollution by using more environmental technologies. The paper deals with the evolution and analysis of the mentioned problems within the Košice region.
Determination of Cl- and SO42- in Boric Acid
Authors: Gong Dian Ting
Published: February 2012

Microcontents of Cl- and SO42- in boric acid were determined by photoelectricity turbidimetry with acid as medium. The effects of stabilizer, acidity of solution, content of precipitant, heating time and temperature as well as measuring time on the turbidity of the solution were studied. After above experiment parameters were optimized, in the measurements to determine SO42- in boric acid, the stabilizer was glycerine-ethanol (1:4), the precipitant was acidic BaCl2. The solution was shaked and heated, as a result, the adding sequence of reagents had no effects on results. The detection limit was 0.10mg/L, relative standard deviation (RSD) was less than 3%, recovery rate was 98.85%~103.00%, and measuring time last over 40min. SO42- concentration in the range of 0.33 mg/L ~0.83mg/L showed a linear relationship with turbidity. In the determination of chlorine, the stabilizer was glycerine, measuring time held in 40min, detection limit was 0.03mg/L, RSD was less than 4%, and recovery rate was 102.2%~106.5%. Cl- concentration in the range of 0.10 mg/L ~0.25mg/L showed a linear relationship with turbidity. Photoelectricity turbidimetry improve the precision and accuracy of the measurements. The method of turbidimetry to determine Cl- and SO42- in boric acid is simple, reliable, innocuous and applicable in practice.
Effect of Templates on the Electrochromic Properties of Tungsten Oxide Thin Films
Authors: Qu Dan Ni , Cheng Hai Feng , Zhou Yong Jiang , Xing Xin , Liu Dong Qing
Published: February 2012

The mesoporous tungsten oxide (WO3) films were derived from the peroxotungstic acid (PTA) sol with templates through sol-gel method. Polyethylene glycol (PEG) 400 and tri-block polymer P123 (HO(CH2CH2O)20(CH2CH(CH3)O)70(CH2CH2O)20H) were chosen as templates. The structural, morphological, optical and electrochromic properties of the WO3 thin films derived from different sols were studied. The composition and crystal phase of the films change at different annealing temperatures. The films derived from the sols containing templates have higher crystallization temperature than those without templates. And the morphologies are distinctly different from different sols. The addition of the templates can improve the electrochromic properties of the WO3 films, and those prepared from the 3% of P123 sol show the best electrochromic properties. The highest transmittance modulation is near 60%, and the largest ion inserted and deinserted diffusion coefficient can reach 5.706×10-12 cm2/s and 1.271×10-11 cm2/s, respectively.
Cooling System CAE Analysis and Optimization Design of Hot Stamping for High Strength Steel Sheet
Authors: Wang Yu Guang , Sun Qi Han , Li Guo He , Cai Yu Jun
Published: February 2012

This paper has done CAE analysis of hot stamping, and optimized the water-cooled system which takes the degree of uniform temperature of blank as the objective function of optimization. The aim is to find a method of optimizing hot stamping mold cooling system based on ANSYS Parametric Design Language (APDL) with ANSYS Mechanical/LS-DYNA software and lay the foundation for designing hot stamping mold. And the work mainly consists of three sections, building parametric finite element model, simulating the process of quenching and optimizing the location parameters and radiuses of each coolant duct. Finally, contrast the optimal result with the initial result and get the conclusion, and moreover, point out the future work.
The Research on the Dynamic Characteristic of Rubber Isolator
Authors: Han De Bao
Published: February 2012

This paper aims at to study the damping ratio and nonlinear stiffness property of rubber isolator effect on vibration response under different excitation level and temperature. By the means of experiment, the curves of amplitude-frequency of rubber isolator were obtained. Based on the experimental results, the damping ratio was ascertained by the method of half power point. A single freedom mechanics model that describes the isolated system was built, and the equation of frequency response deduced and solved by harmonic balance method. Furthermore, the effects of nonlinear factor of stiffness effect on vibration response were analyzed. The precision of the approximation that solved by harmonic balance method was validated using Runge-Kutta method. It is indicated that the equation of frequency-response can be used to describe the property of frequency-response of rubber isolator.
Instability Analysis of the Bipolar Plate for Welding Fuel Cell
Authors: Yao Yu Xin , Shi Chun Yuan
Published: February 2012

The instability of the bipolar plate for welding fuel cell was analyzed taking the bipolar plate as thin plate. The minimum compressive stress is calculated based on thin plate instability theory caused by longitudinal compressive stress. The simplified thermal stress distribution function is determined using the analytical solution of the plane heat conduction equation. The maximum compressive stress is determined through the analysis of the longitudinal stress distribution of the cross section passing through the solder point during heating and cooling process. The results are used to obtain the pre-tensile stress controlling the instability of the bipolar plate for welding fuel cell, and the minimum pre-tensile stress is the difference between the maximum compressive stress and the minimum compressive stress as the thin plate loses instability.
Control Conditions for the Second–Class Crack of Concrete Based on Different Modulus Theory
Authors: Yao Wen Juan , Zhou Yu Ting , Ma Jian Wei
Published: February 2012

Many engineering materials exhibit different elastic properties under the extension and compression. Among these materials, the concrete is a typical material which has different extension modulus and compression modulus. Based on different modulus theory, mechanical analysis was performed in this paper for reinforced concrete beams, stress formula was deduced, and the corresponding formula was applied to concrete structures with second-class crack control, which has improved the original crack control conditions in the code for design of concrete structures in China based on the classical modulus theory.
Investigation on Mechanical Properties of Clay-Based Material Prepared from the Yellow River Silt
Authors: Yang Jiu Jun , Zhang Lei , Guo Pu , Wang Xue Ping
Published: February 2012

The Yellow River silt is a kind of sedimentary sandy soil which comes from the loess plateau carried by the steam of Yellow River. In order to utilizing silt and saving resource, investigation and analysis of characteristics Yellow River silts from the lower reaches area were performed, and clay-based cementitious material were prepared from Yellow River silt as main raw material, and a few of cement, lime and excitant agent as auxiliary materials. The mechanical properties and water resistances of clay-based cementitious material were studied. The results shows that: The clay-based cementitious material which is activated by composite excitant agent composed of sodium hexametaphosphate, calcium chloride and sodium silicate, have favorable mechanical and physical properties, especially favorable water-resistance. The specimen compressive strength is 21.2MPa after curing for 28d and with a softening coefficient 0.78, which cement content is 10% and excitant agent content is 4%.
Based on ANSYS Design Optimization of Vehicle's Tailgate
Authors: Tao Yang , Li Zhi Hu , Wang Shao Fei , Fan Jing Jing , Zou Wen Wu , Huang Yong
Published: February 2012

Increased the machinery of spring and baffle to prevent goods falling bodies ,in order to ensure the safety of persons and goods when loading and unloading. Using UG software for designing automotive Vehicle Tailboards structure of solid modeling, using ANSYS software for mechanical analysising the floating beam, which is the important structural parts of automotive Vehicle’s Tailboards. Analysis the floating beam in different thicknesses and loads of stress, To determined the optimal combination about thickness and load of the floating beam. Above all, The main components of mechanical analysis cannot product the Vehicle’s Tailboards by ANSYS software,Which saving costs on the design and manufacture of production, shorten production cycle and improved the market competitiveness of the product.
Geotechnical Engineering and Engineering Practice in Artificial Filling
Authors: Lei Wei
Published: February 2012

In China, the geotechnical engineering has aroused the attention of geotechnical engineers, who take it as a special research topic. In this paper, problems on artificial filling are discussed, including the environmental geotechnical engineering, the foundation and engineering practices, with corresponding solutions put forward.
Simulation Calculation Method Study on Machinery Output Torque
Authors: Jin Jing , Liang Wei Ge , Zhang Zhen Shan
Published: February 2012

By analyzing the output procedure and theoretical calculation method of power machinery output torque, a kind of advisable simulation method to power machinery output torque was put forward. For example, the wobble plate engine dynamic simulation model was created by this method. And simulation calculation was done based on dynamic model. Result Comparison between simulation calculation and theoretical calculation shows that this method has high calculation precision and maneuverability. At last, some reference suggestions were put forward for application.
Nonlinear Analysis of Bioprosthetic Heart Valves under Dynamic Loading
Authors: Yuan Quan , Ye Xin , Ma Hai Bo , Cong Hua , Huang Xu
Published: February 2012

In order to investigate the effect of material nonlinearity on the dynamic behavior of bioprosthetic heart valve, we establish the spherical, cylindrical and ellipsoidal leaflets models with the material model of Mooney-Rivlin. The mechanical behavior of bioprosthetic valve leaflet during diastolic phase is analyzed. The finite element analysis results show that the stress distributions of the ellipsoidal and spherical valve leaflets are comparatively reasonable. The ellipsoidal and spherical valve leaflets have the following advantages over the cylindrical leaflet valve, lower peak von-Mises stress, smaller stress concentration area, and relatively uniform stress distribution. This work is very helpful to manufacture reasonable shaped valvular leaflets，thus to prolong the lifetime of the bioprosthetic heart valve.
Effects on Mechanical Behavior of the Flexible Tube for Automobile
Authors: Kim Jin Bong
Published: February 2012

Flexible tubes are commonly used in automobile and piping systems to absorb expansion and contraction in order to reduce stress. Unlike to other piping components, flexible tubes consist of a thin walled shell of revolution with a corrugated meridian, in order to provide the flexibility needed to absorb mechanical movements. It is very complicated to analyze the behavior of flexible tubes because of its complex figure. Some fundamental behavior of the flexible tube for automobile is reported with analysis method. Obtained results are as follows; (1) The von-Mises stress is increased with increase of deflection at the flexible tube end and the linearity of stress variation depends on length of the flexible tube. (2) The number of cycles to failure is decreased with increase of deflection at the flexible tube end.
Finite Element (FE) Analysis of Meshing Performance of a Theoretical Assembling Symmetrical Bevel Gear Differential
Authors: Deng Song , Hua Lin , Han Xing Hui , Huang Song
Published: February 2012

The aim in this paper is to analyze tooth surface contact stress and transmission errors, verify existence of tooth end effect and discuss symmetry of symmetrical bevel gear differential (SBGD), etc. With this aim, a 3D elastic FE model of SBGD is established under the ANSYS software environment and its meshing characteristic is determined. Starting from here, by analyzing stress and circumferential displacement of tooth, the phenomena of stress concentration is acquired; the distribution of tooth surface contact stress is studied; tooth end effect is confirmed; transmission error is assessed. The analysis is ended by assessing the symmetry of SBGD. Research results provide valuable guidelines for the design of SBGD. The developing model method proposed in this paper makes it possible to study other complex gear mechanisms such as planetary gear system.
4-Axis Machine Tool Geometric Error Modeling and Measurement
Authors: Pan Fang Yu , Li Ming , Xu Chang Kai
Published: February 2012

To improve the machining precision and reduce the geometric errors for 4-axis machine tool, multi-body system theory is introduced . Based on of the theory, ,through analysing the matrix of the position transformation and the displacement transformation, a model for the machine tool is put forth. By the laser Doppler displacement measurement, test is done and value of the errors is achieved which will benefit for later compensation.
Damage Identification of Benchmark Structure Using ANN
Authors: Yang Xiao Ming , Mi Ya Mei
Published: February 2012

This paper presents an application of artificial neural network for damage identification of benchmark structure that is developed by the ASCE Task Group on Structure Health Monitoring. Many SHM studies apply their methods to the benchmark structure and test their methods. The benchmark structure is divided to three substructures such as brace, column and beam, so the first stage of damage identification is that the damage substructure is identified and the second stage of damage identification is that damage location in substructure is identified. When the damage identification is numerical simulated, the single damage and multi-damage are considered. The method of two stages is applied in the two conditions and ANN is used in every stage. From the result of numerical simulation, ANN can correctly identify the damage substructure and damage location in brace substructure and column substructure.
Thermal Analysis on Cryocooler Cooled High-Tc SMES Magnet
Authors: Shi Ling , Wu Gang , Yu Xin Ming , Pang Zhi Yang
Published: February 2012

A model high-Tc Super-conducting Magnet Energy Storage (SMES) magnet, which is winded with high-Tc super-conducting Bi-2223 trip, is cooled by GM cryo-cooler. The SMES cooling feature is investigated. It took about 17 hours to reach the minimum temperature for the SMES cooling, and its axial temperature difference is 2.8 K, the radial temperature difference is less than 1 K. The thermal contact resistance results in the resource of larger axial direction temperature difference. By improved, the cooling time is about 25 hours for the cryo-cooler cooled 35kJ SMES magnet, its axial direction temperature difference is 0.4 K. At loading 140 A direction current, the magnetic density is 4.5 T, no temperature rise is observed. At loading 60 A alternating current, the upside temperature rise of 35kJ SMES magnet is about 5 K. The 35kJ SMES magnet has been operated stably 480 hours.
The Optimization Research on Treatment of the Soft Clay Foundation
Authors: Ma Yue , Cao Jing , He Yu , Yu Zai Xi
Published: February 2012

The article is about the treatment of deep soft clay foundation of the highway project in Yunnan province. Firstly, it analyses the principle and the different features of vertical enhance body composite foundation, including gravel pile, cement soil pile, CFG pile. All kinds of condition should be considered, such as soft clay characteristics, clay mechanics index, the bearing capacity calculation, settlement and stability analysis, to get a treatment plan by using the results of qualitative analysis and quantitative calculation. Then it verifies treatment effect and summarizes characteristics and treatment laws of deep soft clay depending on the detection and construction monitor to guide design and construction.
Multi-Objective Optimization Method for Borehole Trajectory Design of Directional Well
Authors: Zhang Jian Bing , Liu Xin , Lv Xiang Hong
Published: February 2012

To offer those who are engaged in oil development a multi-objective design method of borehole trajectory for a directional well, the author adopted optimization theory to build a multi-objective optimization mathematic model with the shortest trajectory, the lowest drill string torque and the minimum rig hook load as final objectives, and put forward an approach to seek effective solutions to these multi-objective programming problems with ideal point method. The approach proposed in the paper can help satisfy concurrently multiple objectives of drilling design for an oilfield to implement the multi-objective optimization design schemes of borehole trajectory for a directional well, and to reduce the oilfield development costs accordingly.
The Mechanism of Influence of Roof Properties on Impact Energy Distribution
Authors: Hao Fu Kun , Li Hai Tao , Wang Chen
Published: February 2012

The properties of roof play an important role in the formation and occurrence of rock burst. FLAC 3D is used to simulate the process of excavation and collapse in face advance with difference roof properties based on the elastic theory and field data of “7.16 Accident of rock burst” at Chengshan coal mine. As a result, the energy distribution law on the monitoring plan under different roof properties is given with Fish function. According to the analysis above, hard roof is a crucial reason to cause the accident.
Behaviors of a Blast Wall According to the Angle of Vee Stiffener
Authors: Wijaya Christian , Kim Byung Tak
Published: February 2012

This study has been carried out to investigate the influence of inclined angle of vee stiffener used on blast wall structure. In order to prevent the structural buckling, the vee stiffeners is employed and placed on the compressive region. A higher peak pressure was applied in order to investigate the buckling phenomena on the corrugated panel with vee stiffener. The inclined angle of vee stiffener was varied from 15° to 90°. The results show that an alteration of inclined angle has a considerable effect on the dynamic response of the blast wall structure, the deformed shape and the effectiveness of the stiffener due to the absorbed plastic strain energy. The best inclined angle of the vee stiffener is also determined.
Residual Stress of Gear Meshing under Shakedown Condition with Direct Analysis
Authors: Yuan Yuan , Li Peng Fei , Liu Kai
Published: February 2012

A shakedown mathematical model of gear contact has been developed. A direct method is applied to solve the mathematical model. Local coordinates are constructed on different meshing points because curvature of gear profile is not constant. Distributions of residual stresses and strains are given base on variable curvature surface. The numerical approach consists of an operator split technique, which transforms the elastic-plastic problem into a purely elastic problem and a residual problem with prescribed eigenstrains. The eigenstrains are determined using an incremental projection method. Contact stresses and contact residual stresses of meshing gear teeth with standard and modified profile are computed. The results show compressive residual stress can improve capacity of gear and operating life. This aspect may contribute to future developments in the understanding of gear durability.