bluuebunny/crossref_metadata_2025 huggingface dataset:
An Improved HHT Method and its Application in Fault Diagnosis of Roller Bearing
Authors: Jiang Ling Li , Li Bo Bo , Li Xue Jun
Published: March 2013

Hilbert-Huang transform (HHT) is a very effective time-frequency analysis method, but it has some disadvantages. For example, the dense modal signal cannot be decomposed completely, and redundancy intrinsic mode functions (IMFs) are easy emerging at low frequency, which will cause the distortion of the processing results. In view of the above questions, this study applies the wavelet packet transform for denoising before HHT for improving the dense modal problem, and applies the correlation coefficient method to eliminate the redundancy IMF. The fault diagnostic case of roller bearing shows the effectiveness of the proposed method.
Novel Low-Pass Microwave Filter Based on Rectangular Ring DGS
Authors: Li Bao Ping , Zhang Yan Liang
Published: March 2013

Due to the frequency response periodicity of distributed transmission line, microstrip band-pass filter usually produces parasitic pass-band and outputs harmonics away from the center frequency of main pass-band. Based on the study of rectangular ring defected ground structure, a 5-order microstrip LPF(low-pass filter) was designed using the single-pole band-stop and slow-wave characteristics of the rectangular ring DGS(Defected Ground Structure) and SISS(Step-Impedance Shunt Stub) structure. Compared with traditional LPF, this LPF presents the advantages of compact size, low insertion loss, broad stop-band and high steep. It also validates the requirements of miniaturization and high performance for filters.
Research on Power Life Cycle Asset Management Mode and MEE Comprehensive Evaluation Mode
Authors: Liu Si Qing
Published: March 2013

Combining the actual situation of the electricity industry, this paper aims to help the staff establish a set of scientific and reasonable Indication System for Life Cycle Asset Management through improving and perfecting on the basis of the national power grid Life Cycle Asset Management Indication System. Through the established calculation mode of Life Cycle Asset Management and MEE Comprehensive Evaluation Mode, the system evaluates and researches on the selected substation, analyzing the evaluated result and finds the problems. And then discuss the new mode of Power Life Cycle Asset Management.
Study on the Characteristics of Asynchronous Motor Vector Control
Authors: Feng Hai Chao , Wang Xu Dong , Xu Xiao Zhuo , Si Ji Kai
Published: March 2013

Asynchronous motor vector control is one of hot research problems. In this paper, according to the variable-frequency speed control principle, combining with Variable Voltage Variable Frequency (VVVF) vector control strategies, the asynchronous motor vector control simulation model is built based on the toolbox of Matlab/Simulink in order to study on the characteristics of asynchronous motor vector control. The dynamic characteristics including no-load, load, acceleration and deceleration were researched. The results verified the validity and feasibility of the proposed simulation model for synchronous motor vector control.
Research on Cascade Multilevel Inverter Control Strategy
Authors: Zheng Zheng , Yan Fei
Published: March 2013

Due to easy realization and high equivalent carrier frequency, the Carrier Phase-Shifted pulse width modulation technology has been applied in the multilevel modulation circuit. Space vector modulation technology has a wide range application because it is easy to realize and has the advantage of high DC voltage utilization. However, when it is directly used in a cascade inverter system, it becomes difficult to be realized because of the too many synthesis voltage vectors and switch states. This paper puts forward a new control strategy based on the technology of carrier phase-shift and vector control by means of combing the advantages of Carrier Phase-Shifted with the SVPWM. The simulation results show that the control strategy is feasible. It is not only has good harmonic characteristic and high equivalent carrier frequency, but also has advantages of high DC voltage utilization and easy digitization.
ICP-AES Determination of the Four Trace Elements (Al, Ca, P, Ti) in the Ferrosilicon
Authors: Wu Yan Fang , Jia Ya Juan , He Huan Huan , Liu Pu
Published: March 2013

Ferrosilicon by swinging open vessel acid decomposition method after acid decomposition processing, based on national standards GB/T24194-2009, using inductively coupled plasma atomic emission spectrometry (ICP-AES), determination of the four trace elements (Al, Ca, P, Ti) content in ferrosilicon sample, The use of modern instruments with background correction technology to eliminate polyatomic ion interference on the part of the measured elements. The results of the various elements of the recoveries were between 98.994% and 103.01%, all the precision (RSD) of the detected value is less than 3%, so the high technical accuracy, able to meet the requirements of the simultaneous determination of a variety of elements in ferrosilicon samples.
Analysis on Two Impelled-System Model in Structure of Forestry Industry
Authors: Ding Sheng , Liao Lang Tao , Wen Zuo Min
Published: March 2013

The item of modern forestry economic growth will belong to optimize and adjustment of the forestry industrial structure. By means of systematic economic analyses method and according to the basic theory of industrial structure, this paper brought to light the process of quantity accumulation and quality change in the development of industrial structure, and deduced optimized model of the forestry industrial structure on the basis of the equilibrium analysis to impelled-system model.
The Analysis of the Built-in Electric Field and the Migration of Carries in Thermal/Electric-Field Poled Fused Silica
Authors: Dai Zheng Quan , Duan Jin Yan , Wang Jian , Li You , Ren Yi Tao
Published: March 2013

The thermal/electric poling process of fused silica glass is analyzed based on the multi-carriers’ model. The carrier continuity equation is applied to calculate the variation of the carrier concentration with time. The border of positive charge and negative charge is analogous to a p-n junction. Calculation of the built-in electric field is based on the Poisson equation. The result shows that the second-order nonlinearity effect is mainly formed by the Na+ depletion in the poled fused silica glass. The non-linear coefficient is calculated, it is agree well with the literature values, which verifies the reliability of the theory. The study provided theoretical foundation for manufacture optical communication components.
Coupling Efficiency Analysis of Different Top Coupling Grating for Quantum Well Infrared Photo-Detector
Authors: Yang Ying Li , Wang Guo Dong
Published: March 2013

The relative coupling efficiency of different top coupling grating for quantum well infrared photo-detector is calculated by finite difference time domain algorithms. The relative coupling efficiency respect to the grating parameters, such as, grating period and grating depth is analyzed for both square lattice and hexagonal lattice structure gratings. By comparison, it can be concluded that the optimization grating parameters is differential for different grating structure.
Application of an Improved DV-Hop Algorithm on the Wireless Sensor Network of the Mine Shaft
Authors: Li Geng
Published: March 2013

Since the down hole operational environment is hostile, with serious potential safety hazards, it is necessary to establish a perfect safety monitoring mechanism. As an entirely new communication carrier, the wireless sensor network plays an active role in the safety monitoring of the mine. The sensor node localization technology is the foundation of its application. Its accuracy has a great influence on the effect of the mine shaft wireless communication. In the randomly distributed network, the node localization of the traditional DV-Hop(Distance Vector-Hop) algorithm has more error. In this paper, the original DV-Hop algorithm was improved by optimizing the average skip distance of the anchor node and correcting the accuracy of the hop count between nodes. The results of MATLAB simulation and comparison between the improved algorithm and the original one indicate that the improved algorithm increases the accuracy of the node localization in the mine shaft and which applicable to some extent.
Experimental Study on Monitoring Steel Beam Local Corrosion Based on EMI Technique
Authors: Yang Jing Wen , Zhu Hong Ping , Yu Jing , Wang Dan Sheng
Published: March 2013

The corrosion of the steel structure not only causes the economic losses, but also poses a threat to the safety of the structure. The steel structure corrosion form is divided into uniform corrosion and local corrosion. Lead zirconate titanate (PZT) as a smart material was widely used in structural health monitoring (SHM) in recent years. For local corrosion damage in the form, a steel beam local corrosion monitoring experiments based on Electro-Mechanical Impedance (EMI) technique was designed. Marine environment was simulated and the steel beam local corrosion condition was designed firstly. Then the surface-mounted PZT transducer was used on the structure for long-term monitoring. The development process of corrosion and the admittance change was researched. The result shows that EMI technique is available to the beam local corrosion monitoring by analyzing the change rule of admittance signal and resonant frequency deviation ratio index with the steel beam corrosion.
The Application of Artificial Immune System in Mechanical Engineering for Constrained Optimization
Authors: Ran Xue Nong
Published: March 2013

A hybrid AIS-GA was proposed and tested. The algorithm performed very well in problems presenting continuous, discrete, and mixed design variables, producing feasible solutions in all runs for all problems considered. Also, it is much more easily parallelizable than the previous hybrids, and does not require any user-defined parameter other than the parameters already used by the AIS and the GA.
Design and Implementation of Manchester CODEC Based on FPGA
Authors: Zuo Yun Hua , Yang Jun , Cheng Xiao Yu
Published: March 2013

This paper designed and realized Manchester encoder and decoder based on FPGA. The M sequence generator produced input baseband signal, Manchester CODEC possessed parity check function, and the output signals of encoding and decoding were stable. This design used VHDL language programme, encoder and decoder used modular design, simulated and tested in Altera development software Quartus II 8.0, and downloaded to FPGA chip Cyclone II EP2C35F672C6 for verification. The results showed that the design scheme is good to realize Manchester CODEC, and possesses good stability and reliability.
Weighted Cellular Automata Design for Test Pattern Generator Based on Genetic Algorithm
Authors: Tan En Min , Li Qing Qing , Jiang Ji Gang
Published: March 2013

In built-in self-test design for VLSI, test pattern generator should satisfy some multi-targets, such as test length, fault coverage and test consumption, etc. A one-dimension hybrid cellular automata (CA) is used as the core of test pattern generator, with an optimization of its rules based on multi-objectives evolution algorithm. A certain rule which selected from the optimized rule set is adopted to form the weighted cellular automata, by the using of verilog HDL. Experiment results was obtained by simulation of some ISCAS’8n built-in self-test design for VLSI, test pattern generator should satisfy some multi-targets, such as test le5 benchmark circuits, and indicated that the test length was reduced obviously (at a ratio above 60%), without losing fault coverage (within a discrepancy of 3%); moreover, the power consumption would be decreased correspondingly.
NURBS Curve Fitting Based on Arc Centripetal Parameterization for Tool Path Generation
Authors: Yu Cun Guang
Published: March 2013

NURBS curve fitting is used for tool path planning for sculptured surface NC machining. The cutter location data is parameterized by equal chord arc length parameterization, and Centripetal Parameterization is improved. It is not only more approach to curves nature equation in theory, but also closer to the interpolated curves in actual fitting. It is directly to reflect the curvature of curves of cutter location in NC machining.
Eccentricity and Rotational Speed Effect on the Rotor-Bearing
Authors: Dai Bing , Yu Guang Bin , Shao Jun Peng , Huang Long
Published: March 2013

Bearing dimensionless nonlinear oil film force model is deduced based on Capone theory of cylindrical bearings in this paper. Jeffcot rigid rotor-bearing system dynamic equations are built based on nonlinear dynamics, bifurcation, chaos theory. Eccentricity increases with the speed of the system by writing MATLAB codes. It appears the periodic motion, times of periodic motion and a series of non-linear kinetics. The system eccentricity increases with a series of emergence of non-linear dynamics when speed conditions is fixed, which is the actual system design’s basis. The finite element model of gas turbine rotor-bearing system is built by ANSYS software platform in this paper. The radial bearing deformation relationship are obtained by deformation theory of centrifugal force at high speed bearing radial deformation.
Virtual Production Line Design Based on the IDEF0 Method
Authors: Chai Shu Feng , Luo Su Jun , Bai Li Na , Chai Guo Wei
Published: March 2013

The IDEF0 method can comprehensively and clearly describe the production line design data streams, the material streams and the relationship among the function activities, may guarantee the standard design and lay the solid foundation for the system implementation smoothly. Using the IDEF0 method to describe the function of the production line design flow, it can satisfy this complex large-scale system analysis and design request. It aims at optimizing the manufacturing of automotive parts to be more scientific and consecutive.
Modal Analysis of CK52125 a New Type CNC Lathe of Ball Screw Based on ANSYS Software
Authors: Zhang Yong Jun , Cui You Zheng
Published: March 2013

The ball screw is a main driving component in the CNC machine tools. The ball screw’s structural performances and working conditions will have an important impact on the machining accuracy of CNC machine tools. However, the previous research method can not suffice the precise results’ requirements. So it is very necessary to do an in-depth analysis of the ball screw, which use dynamic research and be combined with the FEA software ANSYS. This article uses the above methods to do the modal analysis, and then gets the intrinsic frequency and the vibration model. It will make an important significance for guiding the practice.
The Design of CNC Grinding Processing for Glass-Ceramic Convex
Authors: Wang Zhen Bo , Su Hai Yang , Tang Yan Chao
Published: March 2013

This article describes the process design of machining of CNC carved glass-ceramic, which overcomes the question that the traditional process is difficult to process glass-ceramic. Process includes the choice of cutting tools, grinding wheel, coolant, tooling design and roughing finishing etc. It has a certain reference value for glass-ceramic processing technology.
Synthesis and Characterization of Hexagonal Boron Nitride Nanosheets
Authors: Guo Chao , Dong Li Min , Gong Shi Jun , Miao Chun Yu , Zhang Xian You
Published: March 2013

In this article, hexagonal boron nitride nanosheets have been successfully synthesized by the method of solid-phase sintering using boron oxide (B2O3) and sodium azides (NaN3) as the reactants and magnesium powder as catalyst at 450 °C. Results from XRD suggest that the synthesized products be indexed as pure h-BN. The surface morphology of the products was observed by the scanning electron microscope, that the products are constituted of a large number of the structure of nanosheets. And the SEM images show the sheetlike materials with a diameter of about 500-900 nm, and the thickness is about 100 nm. The far-infrared absorption spectrum showed that the typical sp2 hybrid structure of hexagonal boron nitride. The optical properties of the product are observed in the PL spectra, which shows that the prepared BN emits strong visible luminescence at 445 nm (λex = 325 nm).
Study on the Application of Kansei Engineering in Product Form Design
Authors: Xu Yu Qing , Chen Kun , Qin Hai Bin , Wang Zhao Yang
Published: March 2013

Design mode of product form is constructed combining Kansei Engineering (KE) with Ergonomics. KE is used as main technique to transform consumers' feelings and images of shape, size, material, operability of product into design form futures. The main factors and problems of Kansei experiment and Kansei analysis are also identified.Ergonomics acts as the assisting technique for meeting physiological criteria of consumer group. An implement of a product form design was conducted, and then the feasibility of proposed design mode based on KE is discussed which provides related products’ reference to designers.
Large Eddy Simulation of Gas - Second Order Moment of Particle Approach for Riser
Authors: Chen Ju Hui , Hu Ting , Li Jiu Ru
Published: March 2013

Flow behavior of gas and particles is performed by means of gas–solid two-fluid model with the large eddy simulation for gas and the second order moment for particles in the riser. This study shows that the computed solids volume fractions of two cases are compared with the experimental data using a two-dimensional model. The gas and solid velocity is computed.
Influence of Working Parameters on Dynamic Pressure Effect of Heavy Constant Flow Hydrostatic Center Rest
Authors: Wu Bo , Yu Xiao Dong , Chang Xue Mei , Yin Chao
Published: March 2013

In order to increase the working performance of a heavy constant flow hydrostatic center rest, a theoretical study concerning the lubricating oil film dynamic pressure effect of the heavy constant flow hydrostatic center rest is described. The Computational Fluid Dynamics and the Finite Volume Method have been used to compute numerically the static pressure field and the total pressure field of the lubricating oil film. The influences of spindle rotating rate, lubricating oil dynamic viscosity and inlet flow rate on the lubricating oil film dynamic pressure effect of the heavy constant flow hydrostatic center rest were analyzed based on the computational fluid dynamics and lubrication theory, and the influencing laws were revealed. By means of this method, the reasonable data can be provided for reasonably controlling dynamic pressure and structure optimal design of the heavy constant flow hydrostatic center rest.
An Adjusting Method for the Suspender Force of Continuous Beam Arch Combination Bridge Based on Influence Matrix
Authors: Liu Han Bing , Wang Long Lin , Tan Guo Jin , Cheng Yong Chun
Published: March 2013

Based on a project of a 22+55+22m continuous composite box beam bridge made of prestressed Concrete, using influence matrix, Numerical Simulation and Iterative Algorithm, an adjusting method for suspender force of continuous beam arch combination bridge has been proposed. It uses Finite Element Numerical Model to calculate the influence matrix and Iterative Algorithm to calculate the suspender force. When rely on this project, the error could be under 0.05% through finite iterative algorithm. And the feasibility has been tested in the completed bridge. It turns out that the error of the measured suspender force of the completed bridge is smaller than that in the design.
Prestress Force Effection on Natural Frequencies of Simply Supported Beams
Authors: Liu Han Bing , Wang Long Lin , Tan Guo Jin , Cheng Yong Chun
Published: March 2013

Natural frequencies of bridges have certain sensitivity to prestressing force, so the identification of effective prestressing force based on bridges' natural frequencies is a effective method. This paper uses Finite Element Methods to establish the finite element model of prestressed steel beam, and then conducts dynamic simulation analysis of the natural frequencies of the simply-supported bridges on the condition of different prestressing forces and different reinforcement eccentricity distance arrangements. Based on the results, it analyzes the law and the extent of prestressing force's influence on the natural frequencies, and at last makes the quantitative relation of the prestressing force and the natural frequencies of the bridges. It supplies the theoretic support for the identification of effective prestressing force in the prestressed simply supported beams.
Fatigue Life Prognosis of Concrete Using Extended Grey Markov Model
Authors: Zhu Chao , Yang Wen Bing , Wang Hui Long
Published: March 2013

The fatigue life prognosis of concrete is becoming more important with the development for demanding higher quality and safety in industrial. However, effective methods for this prognosis are still in need now, due to the feature of concrete. This paper proposes the extended grey Markov model (i.e. EGMM) for fatigue life prognosis of concrete. Firstly, the GM (1, 1, λ1, λ2) (i.e. EGM) is proposed by integrating the particle swarm optimization algorithm (PSOA) with GM (1, 1) (i.e. GM). Then the Markov model is integrated with EGM and a novel prognosis method of the extended grey Markov model is proposed. The EGMM is used to combine the health states and transition probability. And a real case study is used to demonstrate the implementation and potential applications of the proposed fatigue life prognosis approach on concrete.
Refinement of an Ultimate Strain Model for Circular Concrete Columns Retrofitted with FRP Based on a Most Comprehensive Test Database
Authors: Zhou Ying Wu , Xing Feng , Sui Li Li
Published: March 2013

The retrofitting technique of externally wrapped by fiber reinforced polymer (FRP) can significantly enhance the deformability or ductility of deficient concrete columns. This paper develops a new advanced ultimate strain model for circular columns confined with FRP jacket based on a most updated and comprehensive test database where more than 800 axial compression test results of FRP confined circular concrete columns were collected newly. This work began with a careful review on some existing ultimate strain models after which an in-depth comparison between models predictions and experimental test results was conducted. The comparisons revealed that more or less defects of the existing models were detected and there existed large errors of their predictions as a much larger amount of columns than that used in the models derivations were evaluated. It is therefore necessary and of significance to refine a new advanced ultimate model in the paper.
Study of Frost Resistance of 50 Years Concrete Exposed to Saline Areas
Authors: Zhang De Cheng , Lv Yan Ping , Ye Zheng Mao
Published: March 2013

The Hong Run petrochemical oil depot is located in a saline area in the north of Weifang.This area is severe cold in winter and has large temperature span throughout a year. Due to the area's rigorous environmental conditions, concrete with 50 years durability and strength grade of C40 was fabricated with the ordinary Portland cement, high performance superfine mineral powder and high performance pumping agent. Tests using the onsite concrete samples show that concrete mechanical properties meet the design requirements. After 300 freezing and thawing cycles including accelerated freezing thawing method and single-side freezing thawing method, the quality loss rate and relative dynamic modulus both comply with the design requirements. This suggests that the sample concrete has excellent frost resistance ability.
Probabilistic Characteristics of Residual Displacements of SDOF Systems
Authors: Yu Bo , Yang Lu Feng , Liu Di
Published: March 2013

Probabilistic residual displacement analysis plays an important role in determination of technical or economical feasibility of repairing the damaged emgineering structures after an earthquake. Probabilistic characteristics of residual displacements of SDOF systems were quantificationally investigated in this study through a comprehensive statistical analysis. The influences of the P-Δ effect, period of vibration, normalized yield strength and post-yield stiffness ratio on probabilistic characteristics of residual displacements were investigated based on 69 selected earthquake records. In particular, the probability models for the normalized residual displacements were proposed and tested. Results show that the P-Δ effect and post-yield stiffness ratio have significant impacts on the residual displacements; the period of vibration also obviously influences the residual displacements for rigid systems; the residual displacement can be described as the Lognormal distribution variable.
Calculation of Equivalent Damping Ratio to Concrete-Filled Steel Tubular Arch Bridge
Authors: Su Li , Li Peng Fei , Wang Yuan Feng
Published: March 2013

Based on the relationship between complex frequency and hysteresis damping coefficient, the formula of equivalent damping ratio of concrete-filled steel tubular arch bridge is deduced. Compared the calculated equivalent damping ratio by finite element model with the measured result, it is shown that the formula deduced in this paper is simple and practical, and can satisfy the engineering demand. At last, the formula given in this paper is closely related to hysteresis damping coefficient of material, with different hysteresis damping coefficient, the equivalent damping ratio will differ a lot.
Study of Elastic-Plastic Sediments on Seismic Response of Concrete Dams
Authors: Yan Yi Zhi , Xiao Jian Fei , Su Zhi Min
Published: March 2013

To solve the problem of sediments on seismic response of concrete dams, pressure wave formula of saturated porous fluid-solid two-phase medium was derived from the Biot’s consolidation theory, and was determined the seismic response magnitude of sediment on concrete dam. Sediment was regarded as elastic-plasticity. And the method was applied to analyze the influence of sediments density, cohesion and friction angle on dam seismic response. Finally, a typical example is analyzed. The result shows sediments are significant on dam seismic response.
The Division of Zhangjiakou Formation of Later Jurassic at Jibei
Authors: Chen Ying Fu , Wang Gen Hou , Meng Qing Tao
Published: March 2013

There is not a unified division scheme on the lithostratigraphic unit of Zhangjiakou formation from later Jurassic at jibei for a long time, so it makes the divisions more confusion, the establishment of the reasonable stratigraphic sequence and regional stratigraphic correlation has been effected. The Zhangjiakou formation is divided into three lithologic members in turn based on lithology combination of the phase sequence at Zhangjiakou by author through the project of “the study of jibei Mesozoic continental volcanic-sedimentary basin 1:250000 mapping method”. The first section mainly includes lithology combination of weak eruption phase sequence. The second section is main the lithology combination of explosive phase sequence; the third section mainly includes lithology combination of the eruption phase sequence. These three sections respectively represent the stage of the initial outbreak, the large-scale outbreak and a caldera collapse deposition. This division method can reflect volcanic tectonic features, establishing reasonable stratigraphic sequence, this contribute to the study of the history of the volcanic evolution. It can also combine the lithostratigraphic units division and volcanic-sedimentary organically.
Numerical Study on Effects of Interphase in Natural Short Fiber Reinforced Polymer Composite Based on Cohesive Zone Model
Authors: Shen Min , Duan Yan Li , Liu Yang , Liang Dong Chao
Published: March 2013

Natural short fiber reinforced polypropylene (PP) composite has great significance both in commercial and environmental and is widely used in motor industry. Its local inhomogeneity and interphase both affect the macroscopic properties of the composite. These phenomena are still difficult to observe and study accurately in the experiment. A cohesive zone model (CZM) based numerical simulation method is presented in this paper. The three-phase (matrix-interphase-fiber) model considering some different factors was developed to study the effects of interphase parameters on the mechanical properties of the composite.
Microstructures and Electrocatalytic Properties of Nitrogen Doped Graphene Synthesized by Pyrolysis of Metal Tetrapyrazinoporphyrazine
Authors: Fu Yang Xi , Zhang Shou Yang , Li Wei , Li He Jun , Li Ke Zhi
Published: March 2013

Nitrogen doped graphene (NG) was synthesized by chemical vapor deposition at 950 °C, using metal tetrapyrazinoporphyrazine (MPTpz, M= Fe, Co, the mass ratio of FePTPz/ CoPTpz is 1: 1) as a precursor. IR testing of FePTpz indicates the existence of C−N and C=N, which was prepared through microwave method. The NG shows a uniformly distributed and cotton-like structure. TEM images suggests that the single and multilayer NG coexists in the products and it is of a graphite-like structure. Electrocatalytic activity of the NG towards oxygen reduction reaction (ORR) was investigated by the cyclic voltammetry at different scan rates from 20 mV·s-1 to 100 mV·s-1 in an acidic solution. Peak currents and background currents of the NG rose as the scan rate increasing. The maximum peak current is 290.24 mA·cm−2, exhibiting well electrocatalytic activity of the NG toward ORR.
Study on Dynamic Recrystallization Behavior in Deformed Austenite of 52100 Steel by Using JMAK-Model
Authors: Wang Ke Lu , Lu Shi Qiang , Li Xin , Dong Xian Juan
Published: March 2013

A Johnson-Mehl-Avrami-Kolmogorov (JMAK)-model was established for dynamic recrystallization in hot deformation process of 52100 steel. The effects of hot deformation temperature, true strain and strain rate on the microstructural evolution of the steel were physically studied by using Gleeble-1500 thermo-mechanical simulator and the experimental results were used for validation of the JMAK-model. Through simulation and experiment, it is found that the predicted results of DRX volume fraction, DRX grain size and average grain size are in good agreement with the experimental ones.
Preparation of Infrared Stealthy Coatings
Authors: Cui Jin Feng , Ma Yongqiang , Yang Bao Ping , Guo Jun Hong , Zhou Ying Ping
Published: March 2013

Two kinds of microcapsules were synthesized with paraffin and the mixture of n-butyl stearate and n-tetradecyl alcohol as the core material, and the melamine-formaldehyde (MF) resin as shell material, respectively. In this way, the infrared stealthy coatings were prepared by using the as-synthesized microcapsules, the hollow glass microspheres and other auxiliaries. The surface morphology of the microcapsules were investigated by using scanning electron microscopy (SEM). By using the contactless infrared thermometer measurement and radiation rate test device, the radiation exitances of coatings were determined. The radiation exitance of infrared stealthy coatings is lower than the common coatings, which improved the performance of infrared stealthy of destination.
Numerical Estimation of Energy Release Rate of Mode I Crack by Load Displacement Procedure in LEFM and SSY Regimes: A Review
Authors: Govind.P Sai Guru , Raju Karthik Mohan Raju Karthikx , Bhat Sunil
Published: March 2013

Energy release rate, G, of a Mode I crack is estimated numerically by load displacement procedure in the paper. A, through, edge crack is considered in a thin aluminum 2024-T3 alloy plate. The cracked plate is modeled by finite element method. Values of applied load and crack size are suitably selected to simulate LEFM and SSY regimes. Load line displacements are measured from finite element solution. Values of G are compared with J integral values that are obtained from finite element solution using stress and displacement fields near the crack tip.
Application of Cement Stabilized Blast Furnace Slag Material in Road Base Project
Authors: Jiao Tao , He Li Xia , Fu Jian , Guo Jian
Published: March 2013

With low content in CaO, blast furnace slag is a unique local engineering material with characteristic of multi-hole structure and high strength. According to present technical stardard, mix composition of cement stabilized slag is determined by indoor test in different proportion of cement content. Meanwhile, in pilot project, field tests are conducted to both cement stabilized slag and traditional aggregate and indicate cement stabilized slag has obvious superiority and could be adopted completely in application in road base project.
Moisture Absorption Finishing of Polyester Fabric
Authors: Zhang Jun
Published: March 2013

Polyester fabric was finished by water-absorbent and quick-dry agent Casofter-252 and moisture management agent Hipom-790 for improving its moisture management property. The quality of moisture absorption finishing of the polyester fabric was detected in terms of wicking height and fast drying time. And the influence of agent concentration, pH, and curing temperature and time on moisture management property was studied in order to obtain the optimum process condition. The best choice for Casofter-252 was agent concentration 20g/L, pH 3, curing temperature 135 oC, curing time 120s, and the optimum finishing condition for Hipom-790 was as follows: agent concentration 30g/L, pH 5, curing at 115 oC for 140 s. The finished polyester fabric under the optimum condition showed much better air permeability. The tensile strength of the fabric increased after moisture finishing with Hipom-790 while it decreased for Casofter-252 used as a finishing agent.
New Experimental Expression of Durability Dependence for Ceramic Cutting Tool
Authors: Panda Anton , Duplák Ján , Jurko Jozef , Behún Marcel
Published: March 2013

Durability of the cutting tools is very complex process that is influenced by more factors. To the Identify these factors is necessary execute many experiments. The technical science defines the basic method for determining durability of the cutting tool according to results and knowledge F. W. Taylor. The Literature from renowned authors indicates that durability of the cutting tool is defined on the base of T-vc dependence. T-vc dependence like a elementary durability dependence was described according to Taylor´s graphics dependence VB=f(s) for different cutting speeds in 1906. From this theory were later derived others theories, that became the basis of theories durability of cutting wedge for the different cutting materials. For the durability identification of the cutting tool are in technical practice used two basic tests. The First is the short-term durability test and second is machining long-term test method. Both these tests have some advantages and some disadvantages that are described in Introduction of this paper. This paper describes how to create and analytically express new durability dependence for ceramic cutting tool on the base of vc-VB dependence. This dependence consists from vc - cutting speed and VB - criterion of blunting. The whole procedure and its analytical expression is the subject of this paper.
A Study of Stabilization and Recycling for Aluminum Dross
Authors: Kuo Cheng Hsieh , Ueng T.H. , Chen Ching Chyi
Published: March 2013

In this study, a recycling process for stabilized secondary aluminum dross is proposed. Calcium oxide-containing materials, such as de-sulfur slag produced from steel manufacturing process, are used as stabilizing agents for secondary aluminum dross. The de-sulfur slag was first hydrolyzed. Due to the high content of calcium oxide (about 45%), hydration of de-sulfur slag can produce a solution with strong alkalinity (pH≧12). In the strong alkaline environment, the residual pernicious components in the aluminum dross, such as aluminum nitride, aluminum carbide and metal aluminum, are hydrolyzed and decomposed rapidly, resulting in the stabilization of secondary aluminum dross. The stabilized aluminum dross, therefore, was used as the raw material for preparing concrete bricks. In the subsequent concrete brick manufacturing process, the hydration reaction between stabilized aluminum dross and other raw materials can also produce strong alkaline environment (pH≧12), which further stabilizes the aluminum dross wastes, and produce high-pressure concrete bricks with satisfactory performance.
Study on Promotion of Surfactant on Gas Hydrate Formation
Authors: Zhang Lin , Li En Tian , Wang Shu Li , Zhou Shi Dong
Published: March 2013

Natural gas hydrate has huge gas storage capacity, natural gas hydrate storage and transportation technology opens up a new road for energy storage and transportation industry. The current biggest technical problem is how to improve the hydrate formation rate, to increase storage capacity and form continuously. This paper analyses existing research results, and find that SDS is researched the most widely currently, but there are many insufficient. Specific effects of different surfactants on hydrate formation were summarized, hydrate formation mechanism of surfactants were expounded. The lack of research and the research direction of the future were pointed out. It is thought that further study of surfactant mechanism and build kinetics model containing surfactant have important theory value.
Direct Preparation of Tantalum Metal from Ta2O5
Authors: Chen Chao Yi , Li Jun Qi , Lu Xiong Gang
Published: March 2013

A novel process of solid-oxide-oxygen-ion conducting membrane (SOM) technique has been investigated to produce Ta metal directly from solid Ta2O5 in mixture molten of 55.5MgF2-44.5CaF2 (in wt%). The sintered porous Ta2O5 pellet was employed as the cathode while liquid copper, saturated with graphite powder and encased in a one-end-closed yttria-stabilized-zirconia (YSZ) tube, acted as the anode. An electrolysis potential higher than that in Fray–Farthing–Chen (FFC) Cambridge process could be applied to this process because YSZ membrane blocked the electrolysis of the melts and there was no need for flux to dissolve Ta2O5. The results demonstrated that the electrolytic temperature have played important roles in this electrochemical process. Furthermore, this process can be used to efficiently produce Ta metal without the expensive pre-electrolysis and generation of harmful byproducts.
Research of Machining Error Causes and Solutions
Authors: Liu Zhan Dong , Xie Xia , Liu Jie
Published: March 2013

This paper analyzes the factors affecting the machining accuracy. Specific analysis of the causes of error, and take appropriate precautions to reduce processing errors, improve the machining accuracy.
LiFePO4/Li Batteries with Mixtures of Carbonate and Ionic Liquid [EMIM]+[TFSI]- as High Properties and Safety Electrolyte
Authors: Li Fei , Wang Shao Jun , Wei Li , Tao Wei Na , Dong Xue Yang , Liu Hua
Published: March 2013

The electrolyte optimum composition consists of 1mol/L LiTFSI in the [EMIM]+[TFSI]-mixed with EC and DMC in weight ratio of 60:20:20. The LiFePO4/Li cell using 1 mol/L LiTFSI/([EMIM]+[TFSI]-/EC/DMC) as electrolyte show that the first coulomb efficiency was 90% and the first discharge capacity was 168mAh g-1. The 15th reversible capacities were maintain 157mAh g-1at 0.2C. Compared with traditional organic electrolyte and pure IL electrolyte, IL-based mixed electrolyte have good coulomb efficiencies and higher charge and discharge performances. The lithium transference number of IL-based mixed electrolyte at room temperature are 0.59. Thermal stability of IL-based mixed electrolyte higher than traditional organic electrolyte, and show almost non-flammability by the burning tests.
Analysis of Trace Elements in Roughage by ICP-AES
Authors: Gong Kui , Sun Xiao Yun , Xia Ming , Wang Xin Hai , Ren Fei , Guan Peng Lai , Xin Shi Gang
Published: March 2013

In roughage, ten trace elements as Pb, Se, Mn, Se, Zn，Sb, Hg, Sn, Ca, Mg were detected by ICP-AES. Method of high pressure nitrifying pot is also selected to nitrify roughage. The relative standard deviation of measurement was less than 2.60%. The results accord with the demands of analysis trace elements. The experiment proved that roughage contained rich useful trace elements, which was green food with high nutrition.
MPI+OpenMP Hybrid Parallel Algorithm Performance Research on Two-Dimensional Compressible Flow Field Simulation
Authors: Xu Xiao , Wang Xue De , Tan Jun Jie
Published: March 2013

In the multi-core CPU cluster parallel environment, use MPI+OpenMP hybrid parallel algorithm to optimize the numerical simulation program of two-dimension compressible flow field. Test the program which has been optimized, and compared to the program which has been optimized only by the MPI algorithm, get the conclusion that the MPI+OpenMP hybrid algorithm will have advantages in some conditions, and do some specific research on the application of hybrid algorithm used in the flow field simulation, illustrate in what conditions the MPI+OpenMP hybrid will have advantages.
A Neural Network Model for Evaluating Gravel Liquefaction Using Dynamic Penetration Test
Authors: Xu Qing , Kang Fei , Li Jun Jie
Published: March 2013

Evaluation of liquefaction potential of soils is important in geotechnical earthquake engineering. Significant phenomena of gravelly soil liquefaction were reported in 2008 Wenchuan earthquake. Thus, further studies on the liquefaction potential of gravelly soil are needed. This paper investigates the potential of artificial neural networks-based approach to assess the liquefaction potential of gravelly soils form field data of dynamic penetration test. The success rates for occurrence and non-occurrence of liquefaction cases both are 100%. The study suggests that neural networks can successfully model the complex relationship between seismic parameters, soil parameters, and the liquefaction potential of gravelly soils.
Symmetric Multiwavelet Frames with General Composite Dilation in Higher Dimensions
Authors: Huang Yun Sheng , Zhang Xin Cheng
Published: March 2013

Frames play an important role in signal processing, image processing, data compression and sampling theory. In this paper, symmetric multiwavelet frames with general composite dilation and with any symmetric points are constructed from composite dilation multiwavelet frames given. At last, an example is provided to prove the theory.
How Internet Channel Promotions Work Together Based on a Weakest Online Manufacturer? From the Dual Markets Capacity Optimization Perspective
Authors: Li Pei Qin
Published: March 2013

Channel promotion competitions have been common in the Internet market. The paper researches three supply chain partners’ dynamic games in dual markets to find out how Internet channel promotions affect them. Being a leader the first manufacturer’s role is complicated who is the weaker traditional retailer’s supplier, and it competes with the second weakest manufacturer in the internet contemporarily. Then it finds out their optimal decisions by model analysis. Especially it focuses on analyzing how the two Internet channel promotion forms affect three enterprises’ optimal revenues, etc. Besides, some managerial inspiration about capacity optimization could be find out.
The Study on Integration of Supply Chain Based on the Symbiosis Theory
Authors: Zhang Jing , Chen Wei Long
Published: March 2013

The increasingly fierce market made it more difficult for the enterprises to survive. Multinational giants such as Wal-Mart had already used the supply chain integration to deal with difficulties and improve their competitiveness.Symbiosis theory provided a new way to ensure it stable and lasting. First,this paper expounded the basic connotation of symbiosis theory, Then,based on the symbiosis theory which came from ecology and supply chain integration theory, this paper attempted to explore a model of the supply chain integration——a model of multi-level,integrative, equipoise and symbiotic integration(MIESI-Model).Finally,this paper did focuses on the realization mechanism of the model from two dimensions which were symbiosis internal integration and symbiosis external integration.
A Worldwide Comparison of Water Use Efficiency of Crop Production
Authors: Wu Zhao Dan , Lall Upmanu , Zhao Min
Published: March 2013

Worldwide food security and water safety issues necessitate countries with low water use efficiency of crop production (CWUE) to increase it and reduce regional CWUE variations. CWUE function was estimated with stochastic frontier analysis, and CWUE variation was decomposed on inter-continental, intra-continental and international level with variance decomposition method. It is proposed that in order to efficiently improve the CWUE and reduce regional CWUE variation, countries with low CWUE should focus more on the factors listed from the decomposition. Scenario analysis proved the effect of improving the most important factor of CWUE variation, and showed some new key factors in the future after we realize the improvement as mentioned in the scenarios. Lastly we put forward some specific suggestions on the way to improve the CWUE.
Failure Reasons and Support Countermeasure of Intersecting Roadwayss in Deep Soft Rock
Authors: Yin Jing You , Li Er Qiang , Liu Jia Wei
Published: March 2013

In mining engineering construction, more and more involved in deep soft rock roadway stability control problem, also encountered deep soft rock underground engineering intersection problem, but its classification and support measures are far from perfect and systematic. This paper begins with a brief deep soft rock mine intersection classification, then summarize the deformation and failure characteristics, analysis of the impact factors and the reasons of its destruction, for roadway intersection supporting method is recommended.
Analysis of China's Inland Navigation Standards
Authors: Hu Bo Hua , Ai Wan Zheng
Published: March 2013

The development of waterway transport is supported strongly by China's inland navigation standards, but there are deficiencies in inland navigation standards. The inadequacies of China's inland navigation standards are analyzed in this paper, and suggestions for improving standards are put forward, this paper provides a reference to the amendment of inland navigation standards.
Effect of Permeability Coefficient of Reservoir Bank Slope on Pile Displacement and Ground Deformation
Authors: Zhang Guo Dong , Du Peng , Yi Qing Ling , Luo Wen , Yu Xiao Hu
Published: March 2013

Due to effect of reservoir water, the deformation mechanism of reservoir bank slope has a great of influence to the buildings which locate on the bank slope. Considering the changes of permeability coefficient of ground, the deformation characteristics of bank slope ground and pile are analyzed based on the method of pile-soil interaction under the condition that the reservoir water level changing speed is invariable. The results revealed that the larger horizontal displacement of the ground and piles happened when the ground has a smaller permeability coefficient, and the larger settlement of the ground and pile happened, especially the pile which has greater differential settlement when the permeability coefficient of ground is larger. The results have certain reference significance on the safety evaluation and design of buildings which locate on reservoir bank slope.