bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Bulldozer’s Remote Monitoring Service System Based on GPS
Authors: Chen Xiu Sheng , Xu Gang , Wang An Lin , Yao Ai Zhen , Zhou Lin , Peng Chun , Liu Cun Bo
Published: September 2012

In this paper, functions of bulldozer’s remote monitoring service system are analyzed. Construction of the monitoring service system is proposed. Key parts of the system such as data server, backup database server, GPS monitor terminal , user interface are developed. As a result, the bulldozer’s remote monitoring service system based on GPS is of great useful for remote monitoring and control of bulldozer.
Design and Evaluation of Bupt-Cloud-Storage System
Authors: Zhou Li Feng , Yao Wen Bin , Jiang De Yan , Wang Cong
Published: September 2012

Cloud storage, which is composed of a large number storage devices and servers, provides large-scale flexible storage services through Internet. BCSS (Bupt-Cloud-Storage System) based on some cheap irresponsible PCs is designed as a mass storage platform to offer high reliable and available storage services. Meanwhile, it improves performance of data access by providing support of multi-user concurrent control. The experimental results verify efficiency of storage services and the performance of BCSS.
Study of Remote Fault Diagnosis System to Wind Generator Gearbox Based on DSP
Authors: Pan Hong Xia , Gao Yang
Published: September 2012

In order to meet the wind generator gearbox remote condition monitoring and fault diagnosis requirements, using TI's C2000 series DSP-TMS320F2812 processor as its core, the wind generator gearbox remote fault diagnosis system was designed, in this paper. The use of TMS320F2812-rich peripheral modules to build the system's hardware architecture, including the analog signals, frequency signals, digital signal data acquisition, and has Ethernet, GSM mobile communications. For wind generator gearbox bearings and gears common faults, using FIR digital filter, FFT Fourier transform, cepstrum, detailed spectral analysis and other methods to extract the fault characteristic information. The combination of extracted feature vectors, input to BP neural network trained for fault classification and identification, derived fault type, location and extent. Tests show that the system can go a long on-line monitoring, and can correctly identify the fault. It has small size, multi-functional, practical and strong features, particularly suitable for wind generator remote on-line monitoring and fault diagnosis.
Theoretical and Experimental Study on the Secondary Piezoelectric Effect of a Piezoelectric Cantilever Energy Harvester
Authors: Liu Cheng Xi , Wang Xiao Xi , Shan Xiao Biao , Xie Tao
Published: September 2012

This paper presented a mathematical model with respect to the secondary piezoelectric effect of a piezoelectric cantilever energy harvester. The numerical results show that the secondary piezoelectric effect produces an additional electrical stiffness to affect the resonant frequency. A finite element model of the piezoelectric cantilever was developed to analyze the effects of the resistive load on the resonant frequency. Experiments were carried out to verify the validity of the mathematical model and the finite element analysis. The experimental results show that when the load resistance increases from 100 Ω to 100 KΩ, the resonant frequency increases from 139.2 Hz to 143.8 Hz. The experimental results are in accordance with the theoretical results.
Research on the Access-Authorizing-Problem in a Collaborative Manufacturing Platform
Authors: Liu Qiang , Wang Lei
Published: September 2012

Access control on shared resources or information is a high complex problem in a collaborative manufacturing platform since so many design information and manufacturing resources will be created and shared, Meanwhile, security rules or polices from different partners should be obeyed when accessing on these shared resource. Non intuitional semantic of security policies leads to the Access Authorizing Problem (AAP): how do administrators configure an authorizing action sequence to perform the specified assignment task without disobeying these security policies and constraints from different partners or provider? In this paper, we define this problem formally at first and model it to a classic planning problem, then employ the GraphPlan algorithm to resolve it. A case is cited to testify the effectiveness of our method and system in the end. The main contribution of the research is to present definition and resolving method to the access authorizing problem, which can help administrators to make correct authorizing decision.
Research on System of Process Information Integrating and Monitoring for Production Process of Metallurgical Industry Based on Web
Authors: Liang Bei
Published: September 2012

To meet the requirements of process information integration and monitoring for production process of metallurgical industry, the web based production process information integration and monitoring system was developed．This system, which based on fast Ethernet networks for data transmission channel and developing of I/O port, real-time database, data entry and reporting systems as well as related software, share the information of production process and the data from laboratory, check and monitor real-time process, analysis of production process to optimize process.
Scene Modeling and Driving of a Visual Simulation System
Authors: Dong Ming Xiao , Sun Li Juan , Zhu Cui Lan , Su Ming Tao , Tian Jun Ru , Lu Meng Meng
Published: September 2012

This paper designed the design scheme of a visual simulation system for tower cranes, and described the methods of modeling scene and manufacturing texture according to the characteristics of Multigen Creator software and Vega virtual software. The five model optimization techniques including levels of detail technique, instancing technique, removing redundant faces, billboard technique and external reference were discussed in the modeling process. In order to improve system running speed, the methods of reducing the face number of the models and save memory spaces were investigated. Scene driving was realized in programming environment of VC++ software. Finally the scene modeling and driving of visual simulation system for tower cranes were completed.
Research on Pedal Feeling Simulator Based on Magnetorheological Liquid
Authors: Tang Jin Hua , Wang Kui Yang , Yuan Chuan Yi
Published: September 2012

Brake-by-wire is development direction of vehicle brake system, pedal feeling simulator is an important part of brake-by-wire. In this paper, one type of pedal feeling simulator whose damping is adjustable based on controllable rheological properties of magnetorheological liquid is proposed on the basis of analyzing relationship between pedal displacement and pedal pressure of traditional brake system. The structure is designed, damping is calculated, magnetic circuit is analysed and parameters are confirmed. The result shows that the pedal feeling simulator designed can meet actual requirements, and has certain practical value.
Determination of Hemoglobin in Human Whole Blood Using Near-Infrared Spectroscopy with Stability
Authors: Liu Zhen Yao , Pan Tao
Published: September 2012

Near-infrared (NIR) spectroscopy combined with the partial least-squares (PLS) regression was successfully applied for the rapid quantitative analysis of hemoglobin (HGB) based on human whole blood samples. Based on the varied divisions for the calibration and prediction sets, an appropriate waveband with stability was selected through a rigorous modeling process. Among 215 samples, 80 were randomly selected as the validation set. The remaining 135 samples were divided into the calibration set (80 samples) and the prediction set (55 samples) for a total of 200 times with certain similarities. The selected waveband was the combination of visible and short-wave NIR region at 400 nm to 1100 nm. The optimal PLS factor was 8, the modeling effect M-SEPAve, M-RP,Ave, M-SEPStd and M-RP,Std were 2.88gL-1, 0.986, 0.34gL-1 and 0.003, respectively, the validation effect V-SEP, V-RP and V-RSEP were 2.92gL-1, 0.986 and 2.26%, respectively. The results indicated that the method has high prediction precision and well stability. It is hopeful to be applied to clinic.
Mathematical Modeling and Numerical Simulation of Hydraulic Lifting System on Shearer
Authors: Sun Shu Li , Liu Chun Sheng , Zhang Jun , Chen Jin Guo
Published: September 2012

In order to improve the reliability of hydraulic lifting system of Shearer, based on the establishment of the mathematical models for drum hydraulic lifting system, we adopt the Matlab and Automation Studio to simulate the lifting system on shearer, to simulate the real state of working of the lifting system, to analyze the flow, pressure, acceleration impact on working performance of the system, given the basis to evaluation of system reliability. To provide a theoretical frame of reference for the design of the Shearer drum lifting institutions.
Error Modeling and Simulation Analysis for the Vehicle Launching System Erecting
Authors: Xu Bo , Wang Dan Dan , Cheng Zhen Sheng
Published: September 2012

Horizontal collimation is the development tendency of the vehicle launching system. During the erect process, the launching system's navigation precision depends on the strap-down inertial navigation system calculation on the launch carrier. So the analysis of every inertial component's error which produces in the inertial navigation process is very necessary. This paper sets the model of the whole erect process, including the launch of the erect drive, the scaling factor,and zero position and installation error of the inertial components. It analyzes the various factors influence on the navigation precision in detail. It provides a good simulation basis and design basis for the error distribution and precision analysis of horizontal collimation technology. And it also provides analysis results for its application and extension, plan making, precision evaluation.
Dynamic Characteristic Analysis of the Spindle of Planer Drilling Machine Based on ANSYS
Authors: Yang Dai Hua , Gu Xing , Lin Ning , Gu Yun
Published: September 2012

This paper elaborated the practical application of NC Planer Drilling Machine and the important consequence of main shaft structure to working qualities and working accuracy. Then it introduced the design proposal for the spindle structure of drilling machine. The static analysis, modal analysis and harmonic response analysis were done by using ANSYS. It lays a foundation for optimal design and remanufacturing.
Analysis of the Symmetry for a Rotating Strapdown Inertial Navigation System
Authors: Gao Wei , Zhang Ya , Sun Qian , Ben Yue Yang
Published: September 2012

It is known that the precision of the strapdown inertial navigation system is influenced by constant bias of inertial sensors. A method of self-compensation based on a rotating inertial navigation system is proposed to enhance the precision. The constant drift of gyro and accelerometers is modulated into a seasonal and zero-mean form. In the paper, the theory of the rotary modulation and the basic requirement of the rotation method are analyzed. A new dual-axis rotating method is put forward. Simulations have been done. And the results indicate that the method can clear up the constant bias of the inertial sensors quickly and effectively. The position accuracy can be greatly enhanced compared with no rotary manner.
Design and Implementation of a Online Network User Behavior Analysis System
Authors: Hou Song Li , Li Yuan
Published: September 2012

By research of the current network traffic idenfication methods and typical network user behavior analysis methods，a online network user behavior analysis model has been designed and implemented. In order to achieve internal network user behavior real-time monitoring and online analysis purposes.
Research on Boundary Extraction of STL Models based on Genetic Algorithm
Authors: Hao Jing Bin , Wang Zhong Bin , Yang Hai Feng , Li Zhong Kai
Published: September 2012

To efficiently decompose a large complex STL model, an improved boundary extraction method is proposed based on genetic algorithm. Three curvature parameters (dihedral angle, perimeter ration and convexity) were used to estimate the surface curvature information. Genetic Algorithm (GA) is used to determinate the threshold of feature edge. The discrete feature edges are grouped and filtered using the best-fit plane (BFP), which is calculated by Least Square Method (LSM). Several experimental results demonstrate that the amount of feature edges is about half of the preset threshold method, and useful feature edges were reserved. The extracted feature boundaries can be directly used to decompose large complex models.
A Knowledge Based CAD/CAE Integrated Multidisciplinary Design System
Authors: Li Ye Fei , Li Fang Yu
Published: September 2012

This paper presents a knowledge based CAD/CAE integrated multidisciplinary design system. The CAD and CAE models of the major parts of products are established with a set of parameters input from the user interface (UI). The knowledge base and inference engine were constructed to determine the parameters. The system contained self developed modules and commercial CAD/CAE software. It automated the design process and eased the capacity of complicated engineering analysis of the designers and reduced the time for computation. A case study on a roof cover in turbine was carried out to verify the feasibility of this system. The results showed that the developed system facilitated the multidisciplinary design.
Determination and Analysis of the Order of Stress in a Homogeneous Field
Authors: El Guemri Nour Eddine , Yan Sheng Yuan
Published: September 2012

In a structure the presence of a geometric discontinuity of order or material reduces significantly its lifetime. Indeed, it is at these areas that the stress field is strongly disturbed and can reach very high critical levels resulting a damage process. The analysis of these unique areas can not only achieve an optimal design of the geometry of structures but also can choose materials for various assemblies. This analysis necessarily involves determining the parameters of the asymptotic uniqueness constraints. These parameters are the stress intensity factor, the tensor and standardized the order of singularity. This last parameter that indicates the severity of the singularity. It is directly connected to the geometric aspect, and incompatible materials present in the structure. This study focuses on the identification and analysis of this important parameter in the reliability of structures made of homogeneous materials.
Cleaness of the First Pipeline Steel Slab along with Casting Direction
Authors: Huang Jian , Min Yi , Liu Cheng Jun , Jiang Mao Fa
Published: September 2012

To improve the quality controlling of pipeline steel and to avoid mis-down grade, the cleaness including content of non-metallic inclusions, total oxygen and nitrogen of the first continuous casting slags of X70 pipeline steel were investigated. Results showed that, content of total oxygen, nitrogen, large non-metallic inclusions and inclusions areal density decrease with casting length increasing gradually. But at casting length of about 5.0 m which is just during the drastic changeing period of casting speed approaching to stead casting state, the content of large non-metallic inclusions and inclusions areal density increases abruptly induced by the entrapment of mold powders. Thus, to decrease the degradation rate of pipeline slab, the increasing rate of casting speed should be adjusted more evenly.
Aging Behaviors of Ti-Al-Mo-Fe Titanium Alloy
Authors: Lee Dong Geun , Li Cheng Lin , Seo Jung Wha , Mi Xu Jun , Lee Yong Tae
Published: September 2012

Ageing behaviors and microstructural characterization by aging condition of Ti-Al-Mo-Fe alloy was investigated. Due to the formation of ω phase, it occurs a drastic change in mechanical properties of β alloys. There is large increasing in hardness and yield strength, accompanied with serious ductility reduction. However, it has been proved that proper control of ω phase volume fraction can bring to improve strength with a reasonable ductility. In this work new beta titanium alloy was designed and developed in Ti-Al-Mo-Fe alloy to investigate the hardening behavior of ω and α precipitation during aging. The results showed that a small amount of athermal ω was observed in the β matrix during water quenching from above the β transus temperature. Isothermal ω formation was also found during aged at temperatures ranging from 573 K to 773 K although it has a limited time of stability at 773 K. The hardening due to isothermal ω precipitation exhibits no over-aging effect as long as ω phase exists inside the matrix. The hardness of this alloy is very sensitive to size and volume fraction of ω phase and its existence, which depends on aging temperature, time and alloy compositions.
Al-Mg Deoxidation of High Nitrogen Steels in VIF
Authors: Geng Guo Feng , Kong Fan Ya
Published: September 2012

Abstract: The present experiment was conducted to a steel, Fe-20%Cr-10%Mn-6%Ni, in a 25kg intermediate frequency vacuum induction furnace at 1873K under protection of 0.08 MPa nitrogen gas. The inclusions in the steel were studied both before and after Al, Mg was added. The results revealed that the inclusions were removed more efficiently after treated by Al, Mg and the cleanness of metal was promoted to a higher level. The Al treated inclusions had more Mn, Cr and Fe at the core and a significant amount of Al around periphery according to line scanning analysis. After Mg was introduced, it concentrated at the surface of inclusions. The remaining Al content was as low as 0.01% which was lower than expected. The reaction between the Al and MgO crucible should be responsible for it and trace amount of Mg was found in the Al treated inclusions.
Shape Memory Characteristics of NiTi Alloy Wire under Various Constrained Stresses
Authors: Li Yan Feng , Mi X.J. , Yin Xiang Qian , Xie H.F.
Published: September 2012

The present research aims to understand the transformation temperatures and recovery strain of NiTi wires during heating and cooling under various constrained stresses. Both constrained stress and annealing temperature have significant effects on the shape memory characteristics. In general, increasing constrained stress causes an increase of the austenitic and martensitic transformation temperatures and a decrease of the recovery strain. This effect can be attributed to that the constrained stress inhibits the austenitic transformation, and thus more volume fraction of the martensite is retained during heating. The high annealing temperature leads to the decrease in the recovery strain.
Simulation of Casting Process for Ductile Iron Wind Generator Rotor Shaft
Authors: You Ming , Diao Xiao Gang
Published: September 2012

Casting process of heavy section ductile iron wind generator rotor shaft was simulated by finite element software ProCAST. Gating systems was designed according to the structure of the casting. Solidification behavior of the casting was then analyzed. Defects, especially porosity, of the casting during solidification were predicted and hence casting process optimization has been performed based on the simulation results in order to avoid porosity in the casting. Results show that solidification time of the casting is more than 14h when cooled in sand mold. Porosity easily formed at the thermal center and in the middle of flange. Solidification time is evidently decreased with the help of chills. However, porosity tendency depends on the position of chills. A ductile iron rotor shaft casting with good quality was finally produced according to the simulation results.
The Study of SiC Substrate MgB2 thick Films Growing along C Axis
Authors: Wang Yin Bo , Meng Sheng , Dai Qian , Yan Zhang , Feng Qing Rong
Published: September 2012

We have fabricated MgB2 thick films on SiC substrates growing along c axis by using hybrid physical–chemical vapor deposition (HPCVD) technique. The thickness was 8μm. Electric measurement showed that the Tc (onset) was 41.4K, and the transition width was 0.5K, the residual resistance ratio (RRR) was near 7. Magnetic measurement showed that the critical current density was 1.7×106A/cm2 at 5K in a self field.
Effects of Additives on Semiconduction Transformation in Lead Zirconate Titanate Ceramic Induced by Atomic Hydrogen
Authors: Mo Li Bin , Chen Sen , Guo Dong , Cao Jiang Li
Published: September 2012

Effects of additives on the semiconduction transformation of lead zirconate titanate (PZT) during atomic hydrogen charging were investigated. The results showed that the resistivity of the samples decreased by seven orders of magnitude with sixty hours of hydrogen charging in electrolytic without additives. Then with further increasing hydrogen charging time, the resistivity decreased continually, however, much more slowly. Scanning electron microscopy (SEM) showed that the surface structures of PZT were changed significantly upon atomic hydrogen charging. Sodium pyrophosphate (Na4P2O7) and Na2EDTA could effectively affect the semiconduction transformation of PZT as well as the surface structure change. Transmission electron microscopy (TEM) and XRD analysis indicated that there was no new substance formed on the surface of PZT upon atomic hydrogen charging.
Superabsorbent Hydrogel from Sago Starch: The Effects of Crosslinking Agent on Thermal Stability and FTIR Analysis
Authors: Nurizan O. , Zuraida A. , Norhuda Hidayah N.
Published: September 2012

For several decades, superabsorbent polymer hydrogels had attracted the researchers’ attention due to its afforded unique environmental and commercial advantages. This paper reported the study on the effect of cross linker on the sago starch superabsorbent hydrogel (SSH), prepared via graft co-polymerization method of acrylic acid (AA) onto sago starch (SS). The AA grafted copolymer was obtained via a redox initiator system of ammonium persulfate (APS) and in the presence of N, N’ - methylenebisacrylamide (N-MBA) crosslinker. Fourier Transform infrared spectroscopy (FTIR) spectra proved that AA was grafted onto SS. The thermal stability of SSH is increases with the addition of crosslinker.
Harmonic Vibration Synchronization Analysis of the Double Motors Based on Equivalent Control Synchronization Strategy
Authors: Li Xiao Hao , Liu Jie
Published: September 2012

Based on the Lagrange equations, and aimed to the harmonic vibration synchronization problem of the nonlinear vibration machine that driven by double motors, the electromechanical coupling dynamic model of the nonlinear vibration system that driven by double motors had been established in the paper, and harmonic vibration response functions of the nonlinear vibration machine had been deduced also. Based on the equivalent control strategy and the state space equations of the speed difference and phase difference for the double motors that deduced in the paper, the harmonic vibration synchronization control strategy had been established. And based on the sliding surface reaching conditions, the harmonic vibration control synchronization movement law of the double motors had been discussed also. By the simulation experiment, the effectiveness and applicability of the harmonic vibration equivalent control synchronous strategy that established in the paper had been verified. All the research result in the paper can used to be one of an effective control strategy to solve the harmonic vibration synchronization movement problem of the nonlinear vibration machine that driven by dual-motor or multi-motor.
Flexural Properties of Kenaf Sandwich Panel
Authors: Halim Zahurin , Abdul Rahman Siti Khadijah
Published: September 2012

This study concerns on effect of varying skin thickness to flexural properties of sandwich panel. The main element of the core structure is kenaf and the skin used in this study is galvanised steel sheet. Skin thickness being used in this research is 1.0 mm and 1.2 mm. In this study, comparing sandwich of skin thickness 1.0 mm and 1.2 mm, result shows that 1.0 mm skin is sufficient as mechanical properties of sandwich decreases and density of sandwich increases as skin thickens.
Improvement and Function Characteristics of SiCCVD/Al Composite Electric Heating Actuators
Authors: Lu Yun , Hao Liang , Pan Fu Sheng , Hirohashi Mitsuji
Published: September 2012

The relationships between curvature, electric resistance, electric power and temperature of the 1-side and 2-side electric heating actuators of SiCCVD/Al composite were investigated when these actuators were working repeatedly. It was found that the curvature during the heating process was smaller than that during the cooling process for these actuators. To reduce and stabilize the electric resistance of the actuators during repeating work, the ends of the exposed SiCCVD fibers were polished and then sputtered with gold. The results showed that the process of polishing and sputtering with gold on the ends of fibers (PPSG) was benefit to reduce and stabilize the electric resistance of the 1-side actuator. A good reproducibility of the relationship between temperature and curvature for both the 1-side and the 2-side actuators during the cycles of heating and cooling processes was confirmed.
The Research of Pt Heating Resistor Paste Used for Sensors Based on ZrO2
Authors: Huang Hai Qin , Pan Ying Jun , He Xin , Xie Guang Yuan , Peng Zi
Published: September 2012

Pt is used as a heating resistor by sensors based on ZrO2. A heating resistor will directly influence the response rate and life expectancy of the sensor. The service life of heating resistor using pure Pt is very short , in order to improve the quality of resistor, this paper studies the addition of ceramic powder to Pt paste by intermittent thermal shock test of heating resistor slurry life, the method of square resistance test, and using SEM to observe the microstructure of Pt resistor. Then the reasonable Pt paste formula of heating resistor is obtained.
Vibration Analysis and Simulation of Mast Section of Hoist
Authors: Luo Ji Man , Jiang Yang , Xing Zhi Hui
Published: September 2012

In order to avoid the damage of structure caused by the vibration, the natural frequency and vibration mode figure of the stiffness characteristics of the hoist’s structure should be analyzed. Modal analysis method is presented for solving above problem, and the first 6 order natural frequencies in different working conditions have been calculated in this paper. Vibration mode figure of structure system have been simulated corresponding to the first 6 order natural frequencies based on ANSYS. It is shows that the external excitation force have a great influence on the top of the free end when the cage moves to a different location. So, in the actual construction, the stiffness of top free ends connected tie-in device should be strengthened, therefore the system stability will be improved.
A Comparative Study of SHS Synthesis of TiB2 Cermets Powder by Magnesium Reduction and Aluminothermy Reduction
Authors: Wang Hai Bo , Wang Xi Bao , Li Hui
Published: September 2012

In this paper, metal reduction preparation of TiB2 powder via magnesium reduction and aluminothermic reduction were studied. The carbon rod arc heating generated from the spread of the reaction of TiB2，and then the examinations were performed after pickling, crushing and grinding such as SEM and XRD. The results showed that the aluminothermic reduction occurred into the powder impurity phase less, but the need for better technology separation of Al2O3. Magnesium reduction reaction products with more impurities, pickling process removes only the reactants of MgO and other impurities not removed in the air and impurities were analyzed and compared.
Preparation of Flowerlike Indium Oxide Films by a Simple CVD Method
Authors: Li Z.L. , Zhou J.Y. , Wang Z.P. , Gu J.H. , Zhang Y.W. , Wei Y.X.
Published: September 2012

Indium oxide flowerlike films were prepared on glass substrate by a simple chemical vapor deposition (CVD) coating technique. The results showed the products on the glass surface are flowerlike body centered cubic structure of In2O3 films. The flowerlike microstructures are distributed uniformly and have less overlapping, the diameters of them are about 3 µm. The deposition mechanism and the morphologies control procedure of the In2O3 were studied. As the reaction time increases, the morphologies of the microstructures were changed from cocoon-like particles to hybrid thin films, and flowerlike microstructures at last. This novel CVD method might provide a simple route for synthesizing other metal oxide or compound films.
Microstructure and Mechanical Properties in Ultra-High Strength Steel with Tensile Strength 1000MPa
Authors: Ma Yu Xi , Guo Bin , Zheng Lin , Song Chang , Liu Chang Ming , Tao Jun Hui
Published: September 2012

Ultra-high Strength Steel heat process mechanical property energy spectrometer Abstract: Microstructure and mechanical property variation vs. heat process was investigated by means of metallography and electron microscopy in Ultra-high Strength Steel with tensile strength 1000Mpa. The results show that microstructure variation in the steel with tempering temperature increasing is as follows:tempered martensite→main tempered sorbite and a small amount of M/A, at the meantime, growing in quantities and volume of second-phase, always decreasing in strength, firstly increasing and then decreasing in impact energy and elongation. Study on precipitated mechanism of second-phases, the crystal structure and volume of precipitation was characterized by TEM observation and energy spectrometer.
Cantilever Construction Optimization of Cable-Stayed Bridge with Hybrid Bridge Deck System and Building Materials in Civil Engineering
Authors: Dai Yu Wen , Wang You Yuan , Li Zhi Xue
Published: September 2012

This paper describes the basic characteristics of the hybrid bridge deck system made up of two building materials include orthotropic steel deck system and the composite beam deck system, and the problem of excessive horizontal displacement on the bridge tow in cantilever construction as the different weight of the steel bridge deck panel and concrete one. Based on the self-balancing and self-anchoring principle of cable-stayed bridge, two optimizing methods of that adding weight or bridge deck paving after main beam enclosing, were proposed. Numerical simulation of the conventional construction procedure of Beijiang Bridge in Guizhou-Guangzhou Railway was carried out compared with the optimizing procedures proposed. The results show that the max horizontal displacement on the bridge tow is 12.5 cm in the construction period of normal procedure of cantilever construction, which is about 2 cm with the optimizing procedures proposed. Cantilever construction optimization eliminates the hidden dangers by excessive horizontal displacement of the bridge tow, and put forwards a reasonable construction program.
Study on the Resistance of Structural Optimization of Pipeline Elbow in Civil Engineering
Authors: Sun Hong Mei , Zan Zhi Long
Published: September 2012

In the pipe system of infusion, elbow is widely applied in Civil Engineering Structures based on structure materials.This paper studies a new infusion of the pipe elbow. Calculated and analyzed resistance of different structural parameters deflector is on the effect of flow characteristics.
Typical Calculation Method of Stress Intensity Factors and Crack Growth Criterions on Infinite Plate Containing Hole-Edge Cracks
Authors: Zhao Jin Fang , Zhao Qun
Published: September 2012

This paper introduces a finite element analysis software FRANC2D/L to calculate the stress intensity factor (SIF) and simulate the crack growth. Samples with infinite plate containing center crack, one hole-edge crack and two symmetrical hole-edge cracks were analyzed by this software. Comparing the SIF calculation results of the three samples based on displacement correlation method, J-integral method and virtual crack closure integral method, the results show that the three methods are all suitable for calculating the SIF problems, and the calculation precision of J-integral method and virtual crack closure integral method are better. Comparing the three crack growth criterion of maximum circumferential stress, maximum strain energy release rate and minimum strain energy density, the calculation velocity and precision of maximum circumferential stress criterion and minimum strain energy density criterion are prior to maximum strain energy release rate criterion. The calculating time and angle error of maximum strain energy release rate criterion is larger than that of the other two criterions．
Effect of Variant Water Pressure Loading on Soil Improvement by Vacuum Preloading Technique in Civil Engineering
Authors: Liu Ai Min , Yan Shu Wang
Published: September 2012

The vacuum preloading technique has often applied for underwater soft foundation improvement in intertidal zones. However, in those construction activities, the variant water pressure loading has not been considered and the vacuum load was just taken as the vacuum pressure below membrane. This treatment was obviously conservative. This research aims to analyze the effect of variant water pressure on membrane on the soil improvement, and proposes the determination method of vacuum load for vacuum preloading technique in intertidal zones, serving as a valuable reference for engineering design.
Analysis of Load Transfer Mechanism with Rock-Soil Anchoring Technology in Soil Tension-Type Prestressed Anchor for Civil Engineering
Authors: Wang Xiao Yong , Cao Jing , Zuo Huai Xi
Published: September 2012

As an effective rock-soil anchoring technology, tension-type prestressed anchor is widely used in retaining foundation pits and slope for civil engineering because of its fewer perturbation, easier construction, more safety and more stability. The load transfer of anchorage section is the key to the civil engineering design and performance controls of the anchor. Several theoretic models for load transfer mechanism are compared and their insufficiencies are pointed out from the view point of civil engineering application.
The Fractal Research of 16MnR Steel Fatigue Fracture after High Temperature
Authors: Zhang Su , Liu An Zhong
Published: September 2012

In this paper, the computer picture technology was used for recovering three dimensions shape of 16MnR steel fatigue fracture. The fractal dimensions of the 16MnR fatigue fracture surfaces were calculated after high temperatures. The relation between the fractal dimension of fatigue fracture and heating temperatures, the relation between the fatigue mechanical properties and heating temperatures were researched. The relation between the grain size of 16MnR steel and the fractal dimension of fatigue fracture, and the relation between the grain size of 16MnR steel and the fatigue mechanical properties were discussed.
Analysis and Depiction of the Dynamical Characteristic of Burning Zone Temperature in Rotary Kiln of Cement Material Production
Authors: Ge Wei Qing , Xiang Bo , Zhou Ping
Published: September 2012

The cement is one of the most important building materials, and the rotary kiln is a key equipment or process in the cement production industry. During the operating of the cement rotary kiln, the burning zone temperature (BZT) is an important production index and has a significant role on the quality of the clinker. However, the BZT has complex dynamic characteristic and is difficult to be described online using the conventional approaches. Although the BZT can be detected by using the expensive infrared pyrometer which located at the kiln head hood, it generally loses veracity due to the complex dynamics of the cement rotary kiln. In this paper, a novel approach is proposed to analyze and depict the dynamical characteristics of the BZT. Industrial tests have been performed to demonstrate the effectiveness and validity of the proposed method.
An Analysis on Engineering Properties of Peaty Soil in Kunming Civil Engineering
Authors: Yu Zai Xi , Cao Jing , Zhao Hui Min
Published: September 2012

The poor engineering properties of peaty soil are unfavourable for engineering construction. Based on field test datum, the mechanical properties of peaty soil in different buried depth have been analyzed. The result shows that the shear strength of shallowly buried peaty soil reduce gradually with the increase of burial depth, however, which increase gradually along with the depth for deep buried peaty soil. The factors affecting the meso-structure of soil, for example, stress state, the stress history, the stress path, the variation of groundwater, chemical field, biological field and physical field is discussed.
The Design of Disc Brake for Mine Hoist in Civil Engineering
Authors: Zhang Hai Tao , Dai Ying Jun , Jia Yu Jing , Cheng Guang Zhen
Published: September 2012

This article will describe the research status and the features of control system of the disc brakes of mine hoist. The disc brakes consist of body, outer cylinder, cylinder, piston, ring, disc springs, plunger, gate disk and other components. The disc brakes use the pre-load of disc springs to force the piston to move towards the brake disc, push the brake pads out, then the brake pads and drum brake disc contact and resulting in positive pressure, then the formation of friction produce a braking torque. When the brake system loose pads, the cylinder is filled with the pressure oil, which make the piston compresses the disc springs, and promote the brake pads to move back and then left brake disc, remove the braking force. The hydraulic circuit of the braking system chooses two-way parallel oil and four oil cylinder brake. A slip road set up a one-way throttle, making the slip road brake slightly delayed, which will achieve two stage braking and make work more stable. This disc brake is normally closed, which means when the hoist does not work, the brake is in the state of braking to prevent the occurrence of accidents. This brake is safe, reliable and sensitive in action. The materials of brake pads is rigid asbestos plastic, which have stable friction coefficient, good wear resistance, is not sensitive to the aqueous medium and salt spray,it has flexible installation location, and it is easy to use, adjust and maintain.
The Safety Analysis for Underground Tunnel of Civil Engineering by the Stress and Deformation of Rock Mass Material
Authors: Xie Xiong Gang , Yu Zhao Yang , Jiang Ze Biao
Published: September 2012

The Mohr-Coulomb criterion is used in this paper to describe the strength of rock mass in tunnel of civil engineering. The position of a stress point on this envelope is controlled by a non-associated flow rule for shear failure, and an associated rule for tension failure. Excavation of tunnel will lead to the redistribution of stress in rock mass, in order to compare the analytical and numerical solution of rock mass response to predict the safety degree of underground tunnel, to predict the safety degree of tunnel, some calculations are done by theoretical and numerical methods. The comparison results can give guidance for the real practice
The Anisotropy Characteristic of Rock Material Described by the Stress Softening Criterion in Civil Engineering
Authors: Zhang Hai Bo , Liu Qun Yi
Published: September 2012

In this paper, firstly we utilize the elastic model, which provides the simplest representation of material behavior in civil engineering. This model is valid for homogeneous, isotropic, continuous materials that exhibit linear stress-strain behavior with no hysteresis on unloading. The elastic models include both isotropic and anisotropic elastic models. Then the Mohr-Coulomb model is used which can represent shear failure in soils and rocks in civil engineering and geotechnical engineering. After that, the strain- softening model is founded, which allows representation of nonlinear material softening and hardening behavior based on prescribed variations of the Mohr-Coulomb model properties (cohesion, friction, dilation, tensile strength) as functions of the deviatoric plastic strain. Finally, a case study is done for the stratified rock mass, the elastic modulus of the rock sample for different surrounding compressive are obtained, to exhibit the anisotropy characteristic of this type of rock material
Simulation of the Cracking Behavior for Fiber Reinforced Composite Materials with Different Inclusion Quantity
Authors: Luo Ji Xiang
Published: September 2012

Based on the Voronoi cell finite element can also reflect fiber reinforced composites interface to take off the layer and matrix crack propagation of the new cell (X-VCFEM cell)[1]. Combined with the re-mesh strategy and grid dynamic technology, Simulated analysis in different inclusion quantity, interface crack propagation for fiber reinforced composites, the results show that for the model with four,nine,sisteen,twenty-five and thirty-six voronoi cell, The horizontal tension was not the largest; For only a Voronoi cell, The size of the horizontal tension was the largest.The result was very important reference value for manufacturing process and engineering application of fiber reinforced composite materials.
The Microstructure and Performance Analysis of HRB400 Rebar Manual Arc Welding Joints with Rebar Materials in Civil Engineering
Authors: Zhang Min , Zhang Xiang , Wu Cheng Cai , Xi Min Min
Published: September 2012

Manual arc welding is widely used in all kinds of welding material in the civil engineering because of their stable performance characteristics. Based on the analysis of the incision morphology, microstructure and hardness distribution of different kinds of welding joints by manual arc welding methods, how the different welding method of hot rolling ribbed rebar influenced on the performance of the organization has been emphatically discussed to further optimize its performance and provides theoretical basis for the process. The experimental results show that due to the different welding methods and the different heat input, the macro morphology of each welding joints are not identical. The microstructure of welding joints are mainly formed by proeutectoid ferrite, low carbon martensite, tempered sorbite, fine grain ferrite and pearlite. Different welding method, the vickers hardness values along the axis direction of the welded joint and along the direction of cross section are also not identical, and all these lead to the different performance of the different welding joints.
Effect of some Materials on Growth of B. longum and B.adolescentis
Authors: Sun Peng , Yu Qun Li , Pei Guo Liang , Sun Xian Feng
Published: September 2012

The effect of some materials including sucrose, peptone and yeast extract on growth of B. longum and B.adolescentis in the extract of Fructus tribuli was studied by measuring optical density at 600nm (OD600) and pH. The addition of sucrose, peptone and yeast extract was 0.0%-2.40%, 0-1.4% and 0-1.4%, respectively. Results were as follows: addition of sucrose, peptone and yeast extract could promote the growth of B. longum and B.adolescentis. The optimum concentration of sucrose, peptone and yeast extract in the extract of Fructus tribuli was 2.0%, 1.0% and 1.0% for B. longum and 2.20%, 1.0% and 0.8% for B.adolescentis
Study on Interface Failure of Propellant and Liner Material with Mechanics Analysis
Authors: Jiang Ai Min , Li Gao Chun , Tian Ai Ping
Published: September 2012

In order to analyze failure phenomena and mechanical properties of propellant-liner interface material, both experimental study and modeling were carried out. The adhesive system was observed under tensile. Based on experiment, the finite element analysis was implemented. Results show that the failure is initiated on a certain point near the propellant and the deformation concentration of localization zone and the macro-cracks occur. The failure process can be modeled and stress distributions can be obtained by introducing cohesive element. The method offers references to interface designing
Synthesis and Antioxidant Behavior of Carbon-Coated Copper Nanoparticles
Authors: Chen Jin , Zhang Hai Yan , Liu Xiao Ping , Li Li Ping
Published: September 2012

We use plasma method syntheisized Carbon coated copper nanoparticles The structure , size distribution and phase composition of the particles were analysised by TEM , XRD and DSC. Meanwhile, The conductivity of carbon-coated copper nanoparticles were measured. Results show that Carbon coated copper nanoparticles were core-shell structure for the copper core inside, the multi carbon layer outside, around the copper core is graphite-like carbon and far away from the copper core is amorphous carbon. While carbon-coated copper nanoparticles at room temperature and high temperatures have shown good oxidation resistance; The conductivity of carbon-coated copper nanoparticles with metal content increases and when the copper content is 80% the conductivity jump.
Influence of Heat Treatment on the Magnetism of Carbon Coated Iron Nanoparticles
Authors: Chen Jin , Zhang Hai Yan
Published: September 2012

Magnetism Carbon coated iron nanoparticles were produced by DC carbon discharge method .The structure , size distribution , phase composition and magnetic properties of the particles were investigated using TEM , XRD and VSM. The result s show that the core of t he particles is iron , and the shell of the particles is onion shaped carbon. The hysteresis curves of the particles show acharacteristic of superparamagnetic material.
Analysis of Soil Moisture Characteristics with the Application of Soil in Civil Engineering in 2011 in Gaoyao
Authors: Fan Ling Li
Published: September 2012

The data of soil moisture in layer of 0-50cm, precipitation, temperature, sunshine hours and cloudiness in 2011 in Gaoyao were analyzed. The results showed that the soil moisture was vertical uniformly distributed in Gaoyao. The soil humidity was larger in an overcast day than in the others. It was relatively smaller in a sunny day than in the others, because of the impact of solar radiation and temperature on soil moisture. Three layer soil moisture variations were almost synchronous, but the variation amplitude of soil moisture in 0-10cm layer was biggest, and 30-50cm soil moisture variation was least. Regression analysis showed that, precipitation and cloudiness played a dominant role on soil moisture variation, while temperature and sunshine had little effect on the soil moisture. Analysis of soil moisture characteristics with the application of soil was useful to civil engineering in Gaoyao.
Aluminum Alloy Plate with a Hole Fracture Experiment and Numerical Analysis
Authors: Duan Cui Fang , Li Wei , Zhang Ji Liang
Published: September 2012

This article studies aluminum alloy plate through 16 to 3mm thick with a hole under room temperature fracture test. The experimental results show: the initial macroscopic crack initiation at the notch of the center of the surface, along the thickness direction through, then along the width direction of expanded rapidly until complete fracture. Specimen cracking load in the load - displacement curve of descent, less than the limit load. Test piece opening more and more sharp, fracture ductility worse. Perforated plate cracking load depends mainly on the cross-sectional area, does not depend on the gap ratio ( b/a ). The test of aluminium alloy sheets for fracture mechanism and fracture design provides a reliable test data.
TiO2 Nanotubes of Inorganic Functional Materials Research Progress
Authors: Zhou Xian , Wen Quan , Shu Qing Long , Xiong Wang Ping
Published: September 2012

TiO2 nanotubes has aroused widespread attention due to its novel optoelectronics, catalysis, gas sensing performance in solar cells, TiO2 is an important functional materials,photocatalysis, environmental purification, gas sensors have potential applications.Reviewed the latest research progress and development status of TiO2 nanotubes and their preparation methods, morphology, crystal structure, formation mechanism and application prospects.