bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Grouting Heave for Pipeline Underground in Urban Tunnel Engineering
Authors: Sun Feng , Pan Rong , Chen Tie Lin
Published: December 2013

Surface settlement and ground loss can be found inevitably and safety risk of pipeline underground is brought consequently due to excavation, no matter what kind of construction method is adopted. Grouting is increasingly used as the corrective measure to minimize the safety risk of pipeline underground, which means grouting in subjacent bed to raising the pipeline and keep settlement in control. Based on the project of raising an existing pipeline by grouting during the construction of the Huangzhuang station of Beijing Metro, general empirical formula and the finite-difference numerical simulation by FLAC are introduced to study the pipeline deformation caused by excavation, fracture grouting is designed in accordance with the factors mentioned above. The research results can provide references to the construction and design of raising pipeline by grouting in urban tunnel engineering.
Nonlinear Dynamic Analysis of Macroscopic Fracture of Limestone in General Experiments
Authors: Wang Long , Liu Chuan Xiao , Lin Shu Seng , Liu Xing Hui
Published: December 2013

The ultimate fracture of rock depends on flows which rock contains, and the process of fracture is nonlinear and unbalanced. Materials like rocks are inhomogeneous, and geometric shapes of crack are usually complicated and irregular. The macroscopic fracture of limestone is studied by using SWA-2000 Electro-hydraulic Servo-controlled Rock Mechanics Testing System and fractal geometric methods. The results indicate that the magnitude of confining pressure is related to the fractal dimension, and macroscopic fracture can be described quantitatively by using fractal geometric methods.
Experimental Study on Creep of Highly-Weathered Breccia
Authors: Zhang Qian , Li Shu Cai , Li Li Ping , Zhang Qian Qing
Published: December 2013

Mechanical property of rock is the main research object of rock mechanics. In order to further learn the rheological characteristics of soft fractured rock mass, the creep test of highly-weathered breccia with different water content of 0.65%, 1.88%, 4.03% using low-intensity uniaxial creepmeter developed by Shandong University is processed, and the strain-time curves under different water conditions and the corresponding variation of creep curves with different stress levels and moisture states are obtained. The experimental results show that the higher water content is, the larger creep deformation is and the longer time of creep deformation reaching stable is, in other words, the influence of water content on the rheological characteristics of rock mass is also significant. Finally, the conclusion that softening critical load (long-term strength) and softening critical depth of soft rock are greatly reduced due to the effect of water on rock structure and mechanical parameters is obtained to provide the fundamental reference for the follow-up tests and similar engineering.
A Mathematical Model for Subgrade Soil Water-Vapor Migration
Authors: Zheng Jian Long , Mai Can Qiang , Zhang Jun Hui
Published: December 2013

In arid and semi-arid areas, water vapor transfer in non-saturated soil is usually more significant. Based on the existing theories such as soil mechanics and fluid mechanic, as well as the features on water vapor transfer in non-saturated soil, a formula to calculate the saturated water vapor pressure in soil void by taking the matrix suction and temperature into account was got, and a mathematical model for the moisture migration with time was deduced which reveals that a water-vapor migration phenomenon is uneven temperature distribution and uneven distribution moisture alone or in combination manifestations.
Transformation of the Triaxial Seepage Device for Measuring Deformation of Coal Containing Gas
Authors: Yuan Mei , Meng Qing Hao , Xu Jiang , Li Bo Bo , Du Yu Qin
Published: December 2013

To explore the regularity of deformation and gas migration of coal seam, the author transmits signal of strain foil on coal samples in all directions by transforming oil plug, oil plug seal, heat shrink tubing and wire seal, based on the existing triaxial seepage device. We can complete coal deformation and gas seepage test with this device under different temperature, different stress, different gas stress and so on.
Acoustic Emission (AE) Propagation Attenuation Theory and Rule in Non-Perfect Elastic Coal and Rock
Authors: Dong Guo Wei
Published: December 2013

Propagation rule of acoustic emission (AE) signal in coal and rock is an important basis when AE technique forecasts coal and rock dynamical disasters. Based on correlative theory of quality factor Q, Acoustic emission signal propagation attenuation formula in non-perfect elastic coal and rock are analyzed, Based on the theoretic formula, Effects of different quality factor and propagation distance on AE propagation attenuation are theoretically analyzed ;Based on theoretic analysis results, AE signal propagation numerical simulation and field test programs are designed, AE signal propagation rules in elastoplastic coal and rock are obtained. Field test and numerical simulation experimentation results validate rationality of theoretic forumla. Study production can guide AE technique that forecasts mine and rock dynamical disasters.
Analysis on Vertical Swivel Construction of Cable-Stayed Bridge with Steel Arch Pylon
Authors: Li Qiong Hui , Wang Xiang Yang , Han Li Li
Published: December 2013

Single pylon cable-stayed bridge with its attractive appearance , economical advantages, become more and more widely. Vertical swivel construction of cable-stayed bridge with steel arch pylon has just begun in recent years. Similar to the construction of Bridges are rare in our country,so many of the key technologies and construction techniques remains to be further research and improvement. This project is to Gaoxin second road single pylon cable-stayed bridge as the engineering background, to research the key technologies of vertical swivel construction.
A Iterative Computation Method for Main Cable Shape Calculation of Self-Anchored Suspension Bridge
Authors: Song Xu Ming
Published: December 2013

Both finite element method and cable numerical calculation have their limitations in calculation of main cable shape for self-anchored suspension bridge. This paper combined the characteristics of the two methods, and worked out the cable shape and internal force of self-anchored suspension bridge though iterative computation. Sanchaji Bridge, a self-anchored suspension bridge in Changsha city, its main cable shape was calculated by this method. Calculating results show that the real shape of main cable fit the results well and we should carefully calculate the length of girder compression which influences the unstressed length of main cable and the position of hangers. The calculating method adopted in Sanchaji Bridge offered a reference for design and construction for similar bridges.
Design Method of Shear Resistance of Hybrid Fiber Reinforced High Performance Concrete Deep Beams
Authors: Liu Sheng Bing , Xu Li Hua , Lu Hai Lin , Tan Hao
Published: December 2013

In order to study the shear resistance and design method of hybrid fiber (steel fiber and polypropylene fiber) reinforced high performance concrete deep beams, the shear tests were conducted according to the orthogonal experimental design. The contributory factors such as the characteristic parameters of steel fiber (types, volume fraction, aspect ratio), the volume fraction of polypropylene fiber, the ratio of web horizontal reinforcement and the ratio of web vertical reinforcement were analyzed. Results illuminate that shear failure mode of hybrid fiber reinforced HPC deep beams are splitting failure and diagonal compression failure. Hybrid fiber can notably increase the diagonal cracking strength and shear strength of HPC deep beams. The diagonal cracking strength is increased by 5.6%~83.8% while the shear strength is increased by15.6%~35.2%. A formula to calculate the shear resistance of hybrid fiber reinforced HPC deep beams is put forward based on spatial strut-and-tie mode and splitting failure. Meantime test verification is carried out and the calculated results are satisfied.
Modal Stability Control of a Wheeled Heavy Machine
Authors: Chwastek Stefan
Published: December 2013

Mobile heavy machines as unsprung vehicles exhibit low dissipation ability, hence the ride even at low speeds may give rise to intensive vibration, or even to the galloping effect due to enhanced vertical and angular vibration causing the road wheels to break away from the roadway. As these are mostly low-frequency vibrations, energy dissipation in wheel tires will reduce the vibration intensity in a minor degree only. As a result, the speed of a travel has to be reduced, which adversely affects the cost-efficiency of those machines. Observations of an unsprung machine during its forward ride lead us to formulate the hypothesis of reduced machines stability while it moves in the vertical plane of symmetry. The work [2] confirms the view that the vertical motion of an unsprung heavy machine while it moves forward is implemented under the condition of stability limit, mostly due to stiffness of the dynamic system in the horizontal direction. Mobile machines are dynamic systems, governed by nonlinear and often non-stationary differential equations of motion. Their stability is also dependent on the intensity of acting excitations.
An Incremental Method for Cable Force Tuning of the Concrete Cable-Stayed Bridge Considering Cable-Girder Temperature Difference Effect
Authors: Ma Niu Jing
Published: December 2013

To ensure that the cable force tuning of Banfu No.2 bridge was carried out successfully, an incremental method for cable force tuning was presented, which took into account the cable-girder temperature difference. The cable forces were measured through frequency method. Before cable force tuning, all cable forces and temperatures of cables and girders were measured when the ambient temperature was stable, and these cable forces were taken as reference cable forces. During cable force tuning, the increment of cable force was regarded as the control quantity, while the displacement in the middle of main span was regarded as the verification quantity. After each stage, it was necessary to measure the temperatures of cables and girders and the displacement variation in the middle of the main span. To ensure the mechanical state of bridge was in control, all cable forces were measured after the 5th, 10th pairs of cables and all cables were tuned. In addition, the temperature-corrected cable forces were compared with the calculated ones, which showed the incremental method was not only accurate but also efficient.
The Ultimate Bearing Capacity Analysis of RC Beams Strengthened by Externally Bonded and Anchored I-Section Steel
Authors: Zuo Lu , Ye Bo Long , Yu Wan Xiu
Published: December 2013

At first, mechanical behaviour and failure pattern are analyzed in the condition of full bond (with no relative deformation) with I-section and RC beam, and influence of unloading degree in this text, the theory formula of bearing capacity correspondence to failure pattern is erected, the appropriate simple calculate in engineering employ are submitted. In the condition of large the initial reinforcement ratio and the advice is given that strengthening by externally bonded and anchored I-section steel is avoided. Besides, in the condition of considering of bold-slid, the formula of interface stress is erected. Base on the relative slipping effect, the theory formula of additional moment that is derivable from slid action, and the influence of the thickness of glue, unloading degree the ratio of I-section steel to additional moment is discussed.
FEM Analysis of Impact Tests for Steel Plate Concrete Panels against Scaled-Aircraft Impact
Authors: Zhu Xiu Yun , Pan Rong , Sun Feng
Published: December 2013

Due to the rear-face steel plate of the steel plate concrete wall (SC) is very effective in preventing the perforation and scabbing of concrete, in order to resist the impact of commercial aircraft crash, steel plate concrete structures are usually used in the design of external walls of nuclear power plants. In this paper, the simulation analysis of the impact test of 1/7.5 scaled aircraft model impacting the steel plated concrete panels is carried out by using finite element code ANSYS/LS-DYNA. The Winfrith material model (*MAT_84) in ANSYS/LS-DYNA is used to simulate the concrete. The damage profile of panels and residual velocity of aircraft engine comparisons between the simulations and tests are presented in this paper. The results indicate that the damage modes from the impact simulations are very good agreement with the experimental result. It is verified that not only the selection of the material parameters needed for the steel plated concrete wall and aircraft model but also the entire analysis method was appropriate and effective. This paper provided the effective methodology for simulation of the response of the steel plated concrete structure of nuclear power plant due to commercial aircraft crash impact.
Seismic Performance Analysis under Different Conditions of Location for Shear Wall Frame Shear Structure
Authors: Yang Yi Zhen , Gan Hong
Published: December 2013

Frame shear wall structure as a high-rise building one of the most widely used structure form, has good seismic performance and high bearing capacity, the frame shear wall structure research focused on the study of shear wall quantity more, pay attention to consider shear wall quantity and the intrinsic relationships between shear wall lateral stiffness and to seek the optimal design of shear wall stiffness, ignores the position of the shear wall, on the whole architecture of the influence of lateral stiffness, and can go, is set the location of the shear wall is difficult to study, this article will focus on the research of location of shear wall structure seismic performance, provide reference for the future of this kind of structure design.
The Flowability and Adsorption of Low Sulfate Cement with Superplasticizers
Authors: An Ming Zhe , Han Song
Published: December 2013

The compatibility of low sulfate cement with naphthalene (NS) and polycarboxylate (PCE) type superplasticizers was discussed. The flowability of slurry and the adsorption of superplasticizers (SP) were investigated by mini slump test and TOC. The results show that severe compatibility degeneration is caused by low sulfate content in cement slurry. The water demand of slurry, the standard dosage and adsorbed amount of SPs were dramatically raised. In the cement slurry with low sulfate content, polycarboxylate type superplasticizers presents better performance than naphthalene type. The PCE with lower charge density presents better robustness. It is recommended in the preparation of concrete to avoid the incompatibility problems caused by lack of sulfate in cement paste.
Study on Rubber Particles Modified Concrete
Authors: Wang Lei , Huang Yan Hua
Published: December 2013

After rubber particles are incorporated into ordinary cement concrete, properties of concrete are changed. Specifically, by comparison with concrete without rubber particles, it reduces that the collapsed slump, apparent density, cubic compressive strength, splitting tensile strength and elastic modulus of rubber particles modified concrete. And when less than 50% of sand is replaced by rubber particles, rubber modified concrete can meet requirements of workability. Besides, its self-weight decreases, which is favorable for its structure to resist earthquakes.
Laboratory Research on Aging Properties of Recycled SBS Modified Asphalt
Authors: Zhang Wen Gang , Zhou Liang , Zou Ling
Published: December 2013

To study the aging degree, aging rate of recycled SBS modified asphalt at different aging time and the difference between the recycled one and the new one, aging nonlinear differential equations of recycled SBS modified asphalt and new SBS modified asphalt are established, aging parameters have been calculated by determining the technical indexes of the recycled SBS modified asphalt and the new one. In addition, aging properties of recycled SBS modified asphalt have been analyzed according to the aging parameters and aging equation. The results show that: the nolinear equation can depict the aging properties of both the recycled SBS modified asphalt and the new one; moreover, during the early period of aging, Various performance of recycled SBS modified asphalt decay more rapidly than new one except ductility, while after aging for a long time, various performance tends to be the same.
Thermal Performance Study of Core Board of Metal Sandwich Thermal Insulation Board on Ecotect
Authors: Ding Ke Wei , Li Meng , Chen Dong
Published: December 2013

This paper calculates the thermal insulation materials on thermal, and simulates the thermal materials on Ecotect. Considering about the economic factors, it chooses the core board of metal sandwich thermal insulation board which is suitable for Anhui Province.
Performance Analysis and Improvement Design of School Bus Seat Based on Workbench
Authors: Hu Cai Qi
Published: December 2013

In order to make the school bus seat structure meet the seat safety standards, in this paper the finite element simulation analysis method was adopted to establish the finite element model of the school bus seat frame. Based on this model, respectively, at two different height of seat, and two different numerical test forces were applied to the school bus seat, and in two cases the performances of the seat frame were analyzed and its safety was evaluated. For the analysis result improvement design and modal analysis were conducted, and all those ensure the seat performance to meet standards of school bus seat safety and requirements of seat comfort.
Research on the Compound early Strength Agent to the Performance of Super High early Strength Grouting Material
Authors: Zhang Xiao Ping , Sun Chang Zheng , Zhao Tong Feng
Published: December 2013

The effect of sodium sulfate, triethanolamine and early strength agent A on the early strength reinforcement material final setting time, flexural strength and compressive strength and structure were investigated. The results show that the composite of sodium sulfate, triethanolamine and early strength agent according to a reasonable proportion, the dosage of 0.35% -0.40% (in cementitious material quality), the final setting time of early strength material for 50 to 60 min, Initial fluidity over 320mm, 0.5h flow degree greater than 280mm, 1d bending greater than 12MPa and 28d compressive strength greater than 80MPa, meet the requirements.
Application of Computer Technology in the Simulation Process of Machine Design
Authors: Zhu Yao Wu , Xu Yue
Published: December 2013

Mechanical products are becoming increasingly precise after industrial revolutions. Design is important for the manufacture of those products. Good mechanical design can improve the quality of product, and the efficiency of manufacture. To find the problems in the design and then improve the design, it needed the simulation process after the mechanical design was completed. Computer technologies in simulation process, such as software technology and virtual technology, were deeply studied in this work which combined practice with the concept and characteristics of machine design.
Bending Angle Characteristics of SPFC1180Y Steel by the Laser Irradiation Position
Authors: Lee Hyoung Wook , Park Sun Myoung , Park Sung Jun
Published: December 2013

Laser forming is an advanced process in sheet metal forming in which a laser heat source is used to shape the metal sheet. This is a new manufacturing technique that forms the metal sheet only by thermal stress. Analyses of the temperature and stress fields are very important to identify the deformation mechanism in laser forming. In this experiment, the relationship between laser irradiation position and the bending angle, in terms of laser forming, has been tested and the result was compared and analyzed with respect to the theoretical bending moment and the elastic curve differential equation.
Influences of Surface Roughness of Steel Substrate on Bond Strength of Fiber Woven Composite
Authors: Jia Zhi Ning , Hao Cai Zhe , Han Chao
Published: December 2013

The influences of metal surface roughness on the shear strength and peel strength of fiber woven composites (FWC) were studied. Test results show that the metal surface roughness have an important impact on the shear strength and peel strength of FWC. Higher or lower surface roughness can reduce the adhesive strength of FWC. When the best roughness is 0.8, the maximum peel strength and shear strength of FWC are obtained, which ensure the operation reliability and enough life of the spherical plain bearing (SPB) with self-lubrication fabric liner.
Formation of Giant SiGe Crystals on Insulator by Self-Organized-Seeding Rapid-Melting Growth
Authors: Matsumura Ryo , Chikita Hironori , Sadoh T. , Miyao M.
Published: December 2013

Rapid-melting growth of SiGe stripes on insulator without crystal-seed has been investigated. After rapid-thermal annealing (RTA) of amorphous SiGe stripes (~5 μm) at a temperature between melting-point and solidification-point, SiGe crystals with large lateral sizes (~20 μm) are formed. The Si concentrations in the grains show peaks at the center of the grains and gradually decrease toward the grain boundaries. These phenomena are explained based on the self-organized formation of Si-rich micro-crystals and subsequent Si-segregating lateral-growth during RTA.
Solution of Generalized Jaynes-Cummings Model for many Particle Systems
Authors: Bogolubov N.N. Jr. , Rasulova M.Yu. , Tishabaev I.A.
Published: December 2013

We consider the dynamics of a system consisting of N two-level atoms interacting with a multi-mode cavity field. For the given system, the generalized kinetic equation is obtained and conditions are given under which its solution is reduced to solution of a linear equation, and of the one-dimensional nonlinear Schrodinger equation, respectively.
Investigate Mechanical Behavior of Gold Nanowire with Defect
Authors: Tsai Jia Lin , Hong Cheng Fong
Published: December 2013

This study aims to investigate the mechanical properties of gold nanowires using molecular dynamics (MD) simulation. The effects of the cross section size and the defects on the stress strain curves of the nanowires are examined. Moreover, the inception as well as the processing of dislocationin the nanowire is accounted by means of the centro-symmetry parameter and meanwhile, the energy variation during the dislocation is calculated. Results indicated for the pristine gold nanowire, as the cross section size increases, Youngs modulus increases, but the yielding stress decreases accordingly. Once the ultimate linear point is attained, the dislocation takes place abruptly from the nanowire surfaceand extended along the {111} planes. On the other hand, for the nanowire with defect, it was found that the dislocation is initiated from the defect which can significantlyreduce the yielding stress of the nanowires.
Researching Influence of IBAD PLD Parameters on Properties of Nanocrystalline ZnO Thin Films
Authors: Ageev Oleg Alexeevich , Golosov Dmitriy Anatolievich , Zamburg Evgeny Genadievich , Alexeev Alexandr Michailovich , Vakulov Zakhar Evgenievich , Vakulov Daniil Evgenievich , Shumov Alexandr Vladimirovich , Ivonin Michael Nikolaevich
Published: December 2013

Nanocrystalline ZnO thin films were manufactured by Ion Beam Assisted Pulsed Laser Deposition (IBAD PLD). The influence of technological parameters and parameters of ion assisted deposition on structural, morphological and electrical parameters of ZnO thin films were researched in the experiments. As a result it was determined that changes in the basic technological parameters of IBAD PLD (target-substrate distance, substrate temperature, energy density of the laser pulses, annealing temperature, Ar flow) are able to change properties of the thin films significant, including surface roughness in the range from 0.75±0.20 nm to 7.8±2.2 nm, resistivity in the range from 10-3 Ohm cm to 104 Ohm cm. The possibility of controlling the morphological and physical properties of ZnO nanocrystalline films obtained in the experiments has been shown.
Preparation of ZnO Nanosol Dispersed in Aqueous Medium and its Dispersion Characteristics
Authors: Lim Hyeon Ha , Lee Seung Ho , Lim Hyung Mi , Kim Dae Sung
Published: December 2013

Highly dispersed ZnO nanosol, having an average particle size of about 40nm based on Particle Size Analysis (PSA), was prepared under aqueous solution without the removal of large particles by centrifugation. The ZnO nanosol was investigated on the effect of various dispersion parameters, i.e. milling time, dispersant content, pH, etc. The nanosol was effectively dispersed at 20~30 wt% of dispersant amount compared to ZnO content under ball-milling for 10 hours at pH 10. The dispersion characteristic of the nanosol was investigated into particle size and zeta potential. We discussed on the dispersion behavior of (-) charged ZnO particle surrounded by dispersant together with the variation of (-) charged dispersant's amount in aqueous medium at pH 10. The ZnO powder and nanosol were characterized by SEM, TEM, TGA, FT-IR, PSA and Zeta-potential.
Arbitrated Quantum Signature Scheme with Message Bits Intertwined
Authors: Chen Na , Quan Dong Xiao , Pei Chang Xing , Yang Hong
Published: December 2013

To solve a common problem existing in most of the present arbitrated quantum signature (AQS) protocols, a new AQS scheme is proposed, in which the security is based on both quantum cryptographic techniques and some ideas in classical cryptography. With message bits intertwined in the proposed scheme, an eavesdropper cannot modify the transmitted message for his own benefit. This scheme provides higher security.
Effect of CO2 Flow Rate on the Synthesis Nanosized Precipitated Calcium Carbonate, PCC
Authors: Nooririnah O. , Muhamad Azwar Azhari , Yusliza Y. , Manap Abreeza , Md Ashadi M.J.
Published: December 2013

The precipitated of calcium carbonate has attractedmuch attention because of its numerous applications in various areas of plastics, textiles, rubbers, adhesives, paints and wastewater treatment. Nanosized of precipitated calcium carbonate,(PCC) will enhance the properties and give better performance. Its high purity and close controlled particle size and shape are making it the white filler of choice. Nanosized precipitated calcium carbonate particles were prepared using spraying method. The particles were prepared using three (3) different concentrations of Calcium Hydroxide,Ca (OH)2, three (3) CO2flow rate and three (3) different calcinations temperature. The three (3) concentration of Calcium Hydroxide that been used are 25g/200ml, 25g/ 400ml and 25g/800ml and each of these initial solution sprayed at three (3) different CO2flow rate, 5l/per-minute, 7l/per-minute and 10l/per-minute. Calcium Carbonate, CaCO3powders were then calcined at three (3) different temperature, 1100°C,1200°C and 1300°C. Images from SEM showed morphology of the particles changed to spindle-like or prismatic when the ionic strength of the Calcium Hydroxide, Ca (OH)2was increased.
Statistical Analysis of Reinforced Concrete Structures Accidents
Authors: Sun Jing Bo , Zuo Yong Zhi , Teng Hai Wen , Zhang Tao , Liu Huan
Published: December 2013

The reason of most accidents in the construction engineering are due to the complicated nature of concrete composition, shortcomings during the construction process, equipment and many other reasons. Reinforced concrete quality account for a large percentage of engineering accidents. In this paper, reinforced concrete structures accident type and its causes were classified and summarized through the summarizing and sorting of different cases, and the relationship between them was analyzed and expounded.
Research on the Effects of Blocking Mass on Vibration Resistance Performance of L-Shaped Plates
Authors: Wen Hua Bing , Liu Lin Bo , Peng Zi Long , Zhong Qi Dong
Published: December 2013

The theory of vibration resistance of blocking mass at the corner interface of L-shaped plates is put forward from the perspective of wave approach. The equation of transmission and reflection coefficients of flexure wave is deduced by the presented theory. Based on FE/SEA method, the vibration resistance performance of the hollow blocking mass at the corner interface of L-shaped plates was studied through numerical simulation. The results show that the hollow blocking mass can impede the propagation of the high frequency vibration waves, reduce the vibration and sound radiation of the latter plate, and increase the influence of the reflection waves on the former plate. However, the overall radiant energy is basically identical to the L-shaped plates without the hollow blocking mass.
Effects of High-Speed Railway in Tunnel on Vibration Response of Upper Building
Authors: Xu Si Hui , Zhang Xiao Hui , Chen Han
Published: December 2013

In order to study the effects of high-speed railway in tunnel on vibration response of upper building, the Vehicle-Track-Tunnel-Soil-Building coupling dynamic model was established, and the reaction force of fasteners was used to transmit between Vehicle-Track coupling dynamic model and Tunnel-Soil-Building finite element model. According to modal analysis for typical section of building, sensitive frequency range and sensitive structure locations were obtained. In terms of two conditions, Tunnel-Building Integrated Structure and building are evaded from tunnel for some distance, 1/3 octave vibration level and VLZ vibration acceleration level for all measuring points were calculated to analyze the vibration response of building. The results are shown as follows: for Tunnel-Building Integrated Structure, the overall vibration level is high,which is above 65dB. 2-3dB will be reduced by decreasing speed and improving standard of track. when building is evaded from tunnel for some distance, with larger evaded distance, the vibration response is slighter. However, when evaded distance is above 30m, vibration may be amplified ,so its necessary to select proper distance. Vibration response of structure is most strong when 4 lines meet under building, so strict limitation on meeting condition of trains can effectively reduce vibration level.
Field Test and Analysis for Environmental Vibration Induced by Road Traffic Load
Authors: Fang Xin Feng , Li Dong
Published: December 2013

To study environmental vibration problems caused by urban traffic, field test of ground vibration induced by the traffic load were carried out on a city road and attenuation of the vibration was analyzed from the time domain. Used MATLAB software to curve fitting attenuation coefficient to calculate the variation of vibration with depth. The vibration with depth was analyzed through the attenuation coefficient. The results show that the environmental vibration caused by road traffic load was mainly in vertical direction. In addition, environmental vibration in the transverse and vertical directions were both gradually decreasing with the increase of the distance from vibration source. Vibration attenuation was rapidly reduced within 10m and there was almost no vibration in 57 m.
A Transfer Matrix Method for Frame Shear Wall Structures
Authors: Zhang Shuo Ying , Dong Ming Hai
Published: December 2013

This paper established the theoretical equations of transfer matrix method for frame shear wall structures to solve natural vibration and elastic response under earthquakes. Columns at each storey are combined into an equivalent shear member and shear walls are combined into an equivalent bending member. The structure is simplified as a double member system with the two members being coordinated by the in-plane infinite rigid floors. Transfer matrix of the structure was derived according to the fluctuated equations of equivalent members and the equilibrium and displacement compatibility conditions. After considering the boundary conditions at the bottom and top of structure, it presented the equations and method to solve seismic response, natural frequencies and modes of vibration of the structure. In comparison with FEM, it is a more convenient and universal method and is recommended for preliminary design of frame shear wall structures.
Research of the Influence of Dual Functional Hysteretic Dampers on Seismic Behavior of Structure with Big Openings
Authors: Liu Yan , Li Yan , Wang Hui Ling
Published: December 2013

The dissertation shows the formation and failure characteristic of the dual functional hysteretic dampers. SAP2000 was used to analyze the natural period of vibration and vibration mode of structures, the story drift under frequent earthquake and rare occurrence earthquake with different arrangements of dampers and the energy dissipation of dampers. The results show that dual functional hysteretic dampers keep elastic state under frequent earthquake while enter plastic state before the structure under rare occurrence earthquake.
Study on Atmospheric Transmission Characteristics of the Mid-Infrared Laser
Authors: Zhang Yi Zhuo , Hu Wen Hua , Wang Yan Xin
Published: December 2013

A growing number of applications are calling for the compact laser sources operating in the 2~5μm, which is called the mid-infrared spectral region. In general, a laser beam is attenuated, broadened, defocused and may even be deflected as it propagates through the atmosphere. In this paper, the transmission characteristics of mid-infrared laser which covers the whole 2~5μm spectral band are theoretical analyzed, and the computational simulation results are given.
Numerical Simulation on the Infrared Radiation Characteristics of S-Shaped Nozzles
Authors: Gao Xiang , Yang Qing Zhen , Zhou Hong , He Jian Nan
Published: December 2013

Infrared stealth is of great importance to increase the survival ability of the aircraft. The exhaust system is the main radiation source of the aircraft at the rare hemisphere. A program using reverse Monte-Carlo method was developed to calculate the infrared radiation intensity of afterburning turbofan engine under non-afterburning condition, and simulate axisymmetric nozzle and three S-shaped nozzles with different relative eccentric distances. The results demonstrate that: the infrared intensity of S-shaped nozzle is much lower than that of axisymmetric nozzle; S-shaped nozzle can effectively reduce the maximum of IR intensity in the rear hemispheric space; the S-shaped nozzle with the relative eccentric distance of 0.5 can reduce the intensity of infrared radiation in critical detection directions effectively.
Applying GA Algorithm to the Modular Division for Distributed Reconfigurable Satellite System
Authors: Zhang Shuo , Wu Guo Qiang , Han Xiu Li , Cao Rong Bo , Li Yong , Zhou Qing Rui , Wang Hui
Published: December 2013

For the problem of module division for distributed reconfigurable satellite system. A satellite function tree top-down is set up in this paper. And the genetic algorithm was applied in the module division. Finally the entire satellite was decomposed into various standard parts. In practice, users only need to combine those standard parts into a specific function module according to the requirements. Then send those modules into their orbit. And those modules through the way of formation flight, wireless connection to fulfill the task. Considering China's space development strategy, satellite systems long life and high reliability, upgrading, expansibility, satellite systems planning, running, production all kinds of uncertainty factors. Finally the satellite system was divided into 15 standard parts.
Load-Carrying Ability and Application of Composite Materials Air Cushion in the Aerostat
Authors: Zhang Tai Hua , Yang Yan Chu , Gao Heng , Jiang Lu Hua
Published: December 2013

The applications of air cushions are briefly reviewed in airships and tethered aerostats. The stress distributions of air cushions are simulated by finite element analysis software according to its load-carrying characteristics. Three kinds of interlayer forms are proposed and simulated thereafter. A best form of interlayer has been obtained via comparing the different analyzing results. In addition, an empirical formula is proposed for the differential pressures and load at the top of the air cushions, with experiments in which two kinds of air cushions are designed and their load carrying abilities are evaluated. Some advices are then provided for the designing and using of air cushions at the end of this paper.
Evolutionary Structural Optimization Using Material Efficiency Grades
Authors: Hu Xing Guo , Cheng He Ming
Published: December 2013

In the evolutionary structural optimization (ESO) using the rejection ratio, the criterion of the inefficient material removal cant generally be lowered during the optimization process because the rejection ratio cant be decreased. Owing to this, some sorts of structures in special load cases cannot be optimized smoothly; or the late optimization of an ordinary structure is terminated suddenly when the removal of material abruptly increases excessively. The paper puts forward the Evolutionary Structural Optimization using Material Efficiency Grades (ESO-MEG) in order to eliminate the unfavorable effects of the rejection ratio on the results of ESO. The ESO-MEG can determine inefficient material in a structural optimization according to the efficiency grades of each part of material, so it can adjust timely and flexibly the criterion of inefficient material removal. The research shows that the ESO-MEG is applicable to the optimization of different sorts of structures in varying sorts of load cases, so generalization of this method has a broad prospect.
Design and Test of High Speed Digitization Sampling Circuit Based on FPGA
Authors: Qin Peng , Lu Hao , Jiang Zhi Ye , Bai Jin Liang , Gao Lu , Meng Gang
Published: December 2013

To sample wideband IF signal with large amounts of data, a high-speed data acquisition program is presented. The program focus on circuit design, issues that need attention, and high-speed sampling signal deceleration strategy. The 2.4GHz rate sampling data acquisition, reception and demux are completed with ADC083000 and Field-Programmable Gate Array (FPGA). At last, a result of sampling with the converter is offered by chipscope software. The result verified ADC083000 has an excellent performance with more than 6.5 bit ENOB and good phase coherence. In engineering practice, the design has been used and has good performance.
Analysis of the Press′s Building Structure
Authors: Ma Zhao Xia , Wang Yu Lan , Yan Guang Cai
Published: December 2013

The main building of the Hubei press has a horizontal contacting passageway in the middle of two buildings in the fifteenth floor, which has attractive appearance and like a doctorial hat from afar. The structure is reasonable and more stable with the diagonal bracing and the beam. Analysis and research in this paper can provide reference for the design of this structure.
Study on Mesoporous PW/SBA-15 for Isomerization of α-Pinene
Authors: Wu Chun Hua , Liu Hui Qing , Zhuang Chang Fu , Du Guan Ben
Published: December 2013

SBA-15 supported phosphotungstic acid has been synthesized under hydrothermal conditions via pH adjustment and characterized with various analytical and spectroscopic techniques including X-ray diffraction (XRD), N2 adsorption, transmission electron micrographs (TEM). XRD results indicate that the substitution of tungsten occurs in the silicate framework structure of SBA-15. Study on the catalytic activity of mesoporous PW/SBA-15 catalyst through the isomerization of the a-pinene was investigated. The best reactive conditions of a-pinene isomerization were follows: reaction temperature 130°C, dosage of PW/SBA-15 catalyst 2 %, reactive time 2 h. Then the rate of a-pinene conversion could achieve 94.56 %, the selectivity of camphene could achieve 48.5%.
Research on the Rationality of the Combined Application of Bamboo and Wood in Outdoor Furniture
Authors: Gao Jing Shu , Zhang Zhong Feng
Published: December 2013

The fresh and elegant appearance, and convenient processing properties make wood become the main material of outdoor furniture design. However, there are limitations in the application of wood, for the lumber cycle of wood is too long, which results in a severe market shortage. Bamboo is a fast-growing material, which can exactly make up for the lack of wood. Whats more, bamboo has a profound cultural connotation and natural appearance. If combine wood and bamboo together, and assemble their advantages effectively, a perfect effect can be obtained. This paper summarizes the characteristics of bamboo and wood, and discusses the advantages and rationality of the combination of bamboo and wood from the material physical properties, the relationship between market supply, Manufacture and cultural implication.
Numerical Simulation on the Effect of Mist on Impingement Cooling of Double Chamber Model
Authors: Liu Guang Jie , Xu Tao , Ge Hai Chao , Yu Zheng Lei , Yoshino Tatsuo
Published: December 2013

As a continuous effort to develop a realistic mist impingement cooling scheme, this paper focuses on simulating mist impingement cooling under typical gas turbine operating conditions of high temperature and pressure in a simplified model of transform piece (double chamber model). Based on the heat-mass transfer analogy, the results of mist cases compare with the none droplet case could be enhanced 320% (the maximum enhancement of adiabatic cooling effectiveness) cooling effectiveness and reduce 108 K of wall temperature.
Noise Analysis of Disc Brake for Automobile
Authors: Wang Da Peng , Cao Jing Sheng , Liu Wei Ze
Published: December 2013

With gradual increase of requirements for comfort and living environment,braking noise has become one of the issues concerned by people. The research and control to noise has become focus on designing and making braking systems. Based on associated test techniques and analysis theories, the corresponding test, spectrum analysis and coherence analysis are conducted, information about the noise and frequency spectrum is obtained; three-dimensional modeling and finite element calculation are conducted to its constituent components, natural frequency and vibration type figure are obtained. The basis for optimization of brake and reducing noise is provided.
Study on the Mechanical Properties and Seismic Performance of Beam-Column Joints of Wooden Structure Building
Authors: Luan Li Wen , Tao Zhong
Published: December 2013

This paper mainly depends on experiment. Take theory and software analysis as supplement. Using pine and fir as test material, the quantitative analysis, using uniform design method to qualitative pine, fir wood block the relationship between mechanical properties and geometrical parameters in the case of triangle, failure characteristics through experimental phenomenon of different materials and different sizes of wood in the triangle block pressure, finally using finite element analysis software ANSYS/LS-DYNA to simulate and analyze test. By comparing the analysis result of test and software, find out the problems and corresponding correction. The final analysis laid the foundation for the whole static wood structure analysis and dynamic. To provide scientific and technical support for rural residential "seismic safety engineering", thus forming the new wooden structure node and reinforcement for clause.
Boosting the Efficiency of an 800 MW-Class Power Plant through Utilization of Low Temperature Heat of Flue Gases
Authors: Wołowicz Marcin , Milewski Jarosław , Futyma Kamil , Bujalski Wojciech
Published: December 2013

This article presents an analysis on possible ways of utilizing low-temperature waste heat. If well-designed, this could contribute to increasing the efficiency of power plants without introducing many complex changes to the whole system. The main analysis focuses on the location of the regenerative heat exchanger in the facility. This could differ with varying temperatures of working media in the system. The base for investigations was a 800 MW-class power unit operating in off-design conditions and supplied with steam from an BB2400 boiler. Modifications to the model were made using commercially available software and by applying the Stodola equation and the SCC method. It allowed to determine the most suitable position for installing the low-temperature heat exchanger. Calculations for off-design conditions show that, after making some modifications to the system, both heat and electricity generation could be increased through the addition of a low-temperature heat exchanger.
The Design Simulation and Parameter Matching Optimization of Electric Drive System for Heavy Off-Road Vehicle
Authors: Ren Xiao Jing , Ma Li
Published: December 2013

The performance simulation and optimization of electric transmission and drive system for multi-axle heavy off-road vehicle is studied. The simulation and optimization model of electric transmission and drive for 10*10 FWD of vehicle are established in CRUISE. And then the optimal preformation and parameters of the system components are obtained.
Flow Field Analysis and Optimization Design of Fan Cover for the Duct System of the Split Air Conditioner’s Outdoor Unit
Authors: Ma Jian , Yang Wang , Gao Lang , Wang Hong Lei
Published: December 2013

The green characteristic of household split air conditioners can be inproved by reducing the noise or improving the energy efficiency. Therefore, a finite element model of outdoor units duct system was built with Fluent considering the coupling of separated components. Based on the simulation results, the flow field of duct system was analyzed, and the structure of fan cowl was optimized to decrease the export eddy. Experiments were done to proved the effectiveness of the modelling and optimizing process.
Use of Logistic Approach in Optimizing the Rotary Kiln Run
Authors: Lisuch Julius , Gonos Jaroslav
Published: December 2013

The strategic object of the innovation process in the raw materials extracting and treatment area is a sustainable development in all its components, particularly in the material, economic, environmental and energy. The paper presents a concrete contribution to the achievement of this goal by applying the principles of logistics in technical and technological optimization of rotary kilns operation with a positive impact in the energetic field especially. Rotary kilns are a long-term core technology of heat aggregates within the mining industry. Today there is a characteristic potential optimization exhaustion of classical optimization approaches and persistent lack of a major operation - high specific fuel consumption. The article presented a solution focused at eliminating the furnace jacket heat loss, which represents around 30% of the total energy output of the burning process and the largest energetic loss. The basis of the presented innovative solutions - the controlled cooling of the furnace jacket is the perfect knowledge of thermodynamics, hydro-mechanical and rheological flows in the process of burning in a rotary kiln and logistics optimization approaches application. The developed controlled furnace cooling jacket system delivers the performance and quality of the burning, reducing an overall energy consumption for the burning process in a rotary kiln by reducing rotary kiln shell losses and by use of the outgoing heat to the surroundings for the combustion air heating.