bluuebunny/crossref_metadata_2025 huggingface dataset:
Dual-Hop Amplify-and-Forward Variable Gain Relaying over Mixture Gamma Fading Channels
Authors: Cheng Wei Jun
Published: January 2015

In this paper, we present the end-to-end performance of a dual-hop amplify-and-forward variablegain relaying system over Mixture Gamma distribution. Novel closed-form expressions for the probability density function and the moment-generation function of the end-to-end Signal-to-noise ratio (SNR) are derived. Moreover, the average symbol error rate, the average SNR and the average capacity are found based on the above new expressions, respectively. These expressions are more simple and accuracy than the previous ones obtained by using generalized-K (KG) distribution. Finally, numerical and simulation results are shown to verify the accuracy of the analytical results.
Performance Evaluation on a Hybrid Algorithm for Computing Constrained Shortest Paths
Authors: He Xiang Zhu , Feng Gang
Published: January 2015

Finding a delay constrained least-cost path in a directed graph is a fundamental issue for quality of service provisioning in communication networks. Recently Feng and Turkay proposed a hybrid algorithm which uses a heuristic approach to boost the average performance of a well known approximation algorithm. In this paper we provide extensive simulation results to show that the hybrid algorithm runs significantly faster than the approximation algorithm, often by one or two orders of magnitude.
Design and Implementation of Multimodal SNS Information Integration System
Authors: Wang Min , Xie Hong , Gao Wei , Sun Nan
Published: January 2015

With the popularity of the network and mobile Internet, numerous social network platforms appeared in the world. Also, there have been a large number of users using a plurality of social network platforms at the same time. When these users use multiple social network platforms, they need to overcome many difficulties such as switching social network client applications frequently and so on. This article takes consideration of the needs of the multiple social networks’ users, proposing a solution to solve multi-barrier problem, and demonstrating the feasibility and effectiveness of the method by actual cases.
Evaluation of Efficiency of Edge Tool on the Basis of New Technique for Analyzing Parameters of Scribing Mark
Authors: Mokritskii Boris Y. , Pustovalov Dmitriy A. , Vereschaka Alexey Anatolevich , Vereschaka Anatoliy Stepanovich , Verhoturov A.D.
Published: January 2015

Experimental comparative evaluation of cutting properties of edge tools underspecified operating conditions is undesirable, since it takes a lot of time and expenses. The need for development of simulation techniques is clear, and the above techniques can be the basis for the classification of compared edge cutting tools on their most appropriate features and for the selection of the most rational type of such a tool using a technique of nondestructive testing. The analysis of the studies in the field of evaluation of the cutting tool properties by nondestructive testing techniques as well as our own experience of developing similar techniques suggest that such a technique could be developed on the basis of the pendulum scribing technique. Thus, the objective of this study was to develop procedures for the selection of rational parameters of edge cutting tools for specified machining conditions based on simulating a low-cost process.The study was supported by grant No. 9.251.2014/K, project code 251.
Experimental Study on Vertical Stiffness of WJ-8 Fastener for High-Speed Railway
Authors: Liu Can , Zeng Zhi Ping , Yuan Jia Yu , Wu Bin , Zhu Kun Teng
Published: January 2015

The rail vertical displacement of CRTSII slab track structure under vertical static loads was analyzed in this paper by using 1:1 full-scale track model, based on which the WJ-8 fastener vertical static stiffness was calculated, and the rationality of the fastener vertical stiffness values and the relationship between the values and load were studied. According to the beam-plate theory and beam-solid theory for slab ballastless track, a finite element analysis model of CRTSII slab track structure was established. The rail vertical displacement under the same case as test was calculated by using the measured fastener vertical stiffness value. The rationality of the method for testing and the fastener vertical static stiffness is verified through comparing the calculated values with experimental ones.
Research of Solid Materials Thermal Conductivity Measurement Based on Laser Photothermal Method
Authors: Zhang Qing Zhi , Wu Gang , Zhang Zhen Ping , Li Yan Fei , Feng Qiao Lian , Tang Zhi Yin
Published: January 2015

Thermal conductivity is one of the basic thermal physical parameters of solid materials. In order to research the thermal conductivity of solid materials in low temperature, the paper has built the calculation model of the thermal conductivity, and the functional relation between the laser frequency and phase lag has been simulated. The simulation results are in line with the experimental data. The research indicates that solid thermal conductivity can be measured availably by Laser photothermal method. Numerical simulation of solid thermal conductivity at low temperature shows that solid thermal conductivity changes remarkably when the scope of temperature is from 20k to 80k, however, the change is light from 80k to 300k.
A Kind of Optimization Method on Plate-Shell Structures with Stiffeners
Authors: Li Jian Kang , Ma Kai
Published: January 2015

An new optimization method which combines layout optimization of stiffeners with structural parameters optimization of structures is discussed. The first step is to optimize the layout of stiffenerser, then the structural parameters were optimized. In layout optimization of stiffeners, the strain energy density sensitivities of the elements were used to determine which elements of stiffeners should be deleted. In structural parameters optimization, the object function and the constraint functions were approximated by the second-order Taylor expansion. DFP (Davidon, Fletcher and Powell) method was presented to solve optimal problem. In order to reduce computational effort, the combined approximation (CA) method was used to reanalysis and update the displacements and stresses of the structure. The present method was applied to a bunker. The numerical results show that the optimization method was effective for optimization of plate-shell structure with stiffeners, and it could be to implement on a computer.
Numerical Simulation of Blasting-Induced Damage in Grouting Curtain of Sandstone Aquifer for Vertical Shaft
Authors: Zhou Yu Liang , Yuan Dong Feng , Zheng Jun , Wang Hua
Published: January 2015

To provide a theoretical basis for water prevention and control methods and reasonable supporting techniques for vertical shaft, and to ensure the shaft construction to pass the sandstone aquifer safely and rapidly, numerical simulation using dynamic damage constitutive model, which was a user-defined constitutive modules in FLAC3D, a lagrangian analysis code in three dimensions, has been applied to investigate the dynamic damage effect in the surrounding rock of the grouting curtain near the driving working face for vertical shaft excavated by blasting. The results indicate that the distribution of the damage zone in the surrounding rock of the shaft, which decreases the effective thickness of the grouting curtain, was like a ellip-se, and that the depth of the damage zone in the surrounding rock of the shaft grouting curtain is fewer than that of the driving face floor. It can be concluded that the centre part of the driving face floor, especially the cutting hole zones, and the shaft wall in the greater horizontal stress side are the " key parts " for shaft water prevention and control methods.
Experimental Study on Dynamic Responses of a New Type of Debris Flow Dam under Solid Impact Load
Authors: Li Jun Jie , Wang Xiu Li , Zhu Yan Peng
Published: January 2015

Dams can effectively alleviate great debris flow hazards to downstream regions, so they has been widely applied to prevention and control engineering of debris flow disaster now. A kind of steel-concrete combined structure with steel braces was presented based on conventional gravity dams, and the superiority of the new structure in terms of impact resistance was verified contrastively by means of model experiments under solid impact. The results show that braces can restrain cracks and reduce their width, thus the extent of damage in impact areas is alleviated effectively. Compared with the conventional dam, the dynamic strains and acceleration peak values of the dam with braces both observably reduce, and the highest reduction ranges of them may be up to 69.2% and 47.8% respectively, so the deformation and vibration are limited by the braces. The dynamic displacement peak values of the new-type dam are significantly less than the conventional dam, and the average reduction range of this index can reach to about 46%, so the structural stiffness has been enhanced by a large margin.
The Application of Fuzzy Optimization Theory in the Selection of Foundation Improvement Methods
Authors: Zhang Li Juan , Han Jiang , Li Zhang Ming
Published: January 2015

Research was conducted on the optimal selection of foundation improvement methods in the paper. Based on fuzzy optimization theory, four evaluation criteria such as construction time are used to evaluate the five improvement methods. The relative optimal degree 0.798 of dynamic-static consolidation method is the maximum which shows that the dynamic-static method is the optimal one; relative optimal degree and multi-evaluating criteria are used to evaluate multi-goals in the fuzzy optimization theory which will lead to the high optimal reliability result.
Research on Stress-Free Rail Temperature Design of Wubei-Xiaohuangshan Railway
Authors: Gao Dong Feng , Sun Wei Long
Published: January 2015

Wubei-Xiaohuangshan railway was characterized by the large local temperature difference, and high density of heavy haul train traffic. Reasonably determining the rail stress-free temperature has an important role on the line traffic safety and stability. Combined with the actual situation of the line, this paper researched some key technical issues of laying CWR in alpine and large temperature difference region, from determining the reasonable allowable temperature rise, allowable temperature drop, the rail stress-free temperature, and its allowable ranges, etc. Look forward to give some reference to the similar engineering problems.
Experimental Study on Historic Masonry Walls Retrofitted with GFRP Sheets in Different Patterns
Authors: Jing Meng , Raongjant Werasak
Published: January 2015

This research determined the seismic behavior of historic masonry walls retrofitted by Glass Fiber Reinforced Polymer (GFRP) sheets through laboratory testing. Brick and mortar were special prepared to get the same properties as that of historic walls. Five full scale wall specimens were constructed according to the dimension of historic walls in Thailand and tested to failure under horizontal cyclic loading. One wall served as reference specimen without retrofitting. Three walls were retrofitted with GFRP in different patterns before subjected to lateral loading. One wall was repaired after predefined shear damage and retrofitted with GFRP before taken the new loading test. Failure mechanism, shear strength, ductility and energy dissipation of walls were studied in detail. The results showed that the walls retrofitted with GFRP sheets in the same strengthening ratio on one side or two sides exhibited the similar improvement on deformation and shear capacity. The wall retrofitted with diagonal GFRP strips behaved the better energy dissipation capacity and more dense and adequate cracking development.
Torsion Test of Fiber Carbon Composite Core Rod Used in Overhead Stranded Wires
Authors: Yu Hong Yun , Li Rui , Qian Miao , Li Guo Yong , Yu Min Bo , Zhu Zhi Hua , Li Zhou Xuan
Published: January 2015

This paper analyzes the performance of fiber carbon composite core rod under torsion load through finite element simulation and full-scale test, providing technical basis for the failure mode and key parameter design of fiber carbon composite core rod.
Graphite/Copper Composites with High Density
Authors: Jin Yong Ping , Guo Bin
Published: January 2015

It is a difficult problem how to obtain the density of powder metallurgy products. Sintering billets had been prepared by mechanical milled graphite/copper compound powders firstly. Their microstructures had been analyzed by such means as scanning electron microscope (SEM) and optical microscope. Influence of technological parameters on relative density had also been investigated. The results show that sintering of non-milled powders are intensely affected by sintering temperature, contrary to mechanical milled compound powders. Hot pressed sintering under vacuum can promote densification effectively. By prolonging time, elevating temperature or pressure of hot pressed sintering, relative density of sintering billets can be increased accordingly. Under the same conditions, relative density decreases with mechanical milling time of compound powders.
Studies on (SBA-15)-AgI Host-Guest Nanocomposite Materials
Authors: Li Xiao Dong
Published: January 2015

SBA-15 molecular sieve owned the characteristic of uniform nanoscale channels, large pores, thick walls and high hydrothermal stability. It has the potential foreground as adsorption, separation, catalysis and new type host-guest nanocomposite materials. In this paper, SBA-15 molecular sieve was synthesized in acidic medium by hydrothermal method using triblock copolymers (EG20PG40EG20) as template, tetraethoxysilane as silica resource. Semiconductor material AgI was incorporated into the mesoporous channels of the SBA-15 molecular sieve by solid phase thermal diffusion method and the (SBA-15)-AgI nanocomposites materials were prepared. The products were characterized by means of powder X-ray diffraction, low-temperature nitrogen adsorption-desorption technique at 77 K and luminous properties were studied. The results showed that AgI went into the channels of the SBA-15, the materials (SBA-15)-AgI remained the highly ordered two-dimensional hexagonal. However, the crystalline was decreased to some degree, the pore volume, pore size and the surface area decreased to some extent compared to those of the SBA-15 molecular sieve. It was found by luminous studies that the energy band gap of the (SBA-15) -AgI composite material is very high and radiation process is very strong. The composite materials possess very good luminous performance and can be hopefully acted as luminous materials.
Enrichment of Lead Element from Air Using Electrospun Nanoﬁbrous Membrane Prepared by Co-Electrospinning of Dithizone with Polystyrene
Authors: Deng Xiao Yan , Li Chen , Kang Xue Jun
Published: January 2015

The objective of this study was to compare the enrichment performanc of polystyrene-dithizone (PS-DZ) electrospun nanofibrous membrane with commercial cellulose acetate (CA) film for lead in air. Lead was analyzed by preconcentration on different membranes followed by digestion and analysis by Atomic Fluorescence Spectrometry. In comparison to CA film, the PS-DZ electrospun nanofibrous membrane exhibited a significant advantage in enrichment efficiency (about threefold increase). The result confirms that electrospun nanofibrous membrane can be a potential candidate for the sampling of metals in air.
Effect of Crystal Orientation Agents on Morphology of Nano-CaCO3
Authors: Cheng Xiang Wei , Xiong Da Jin , Huo Chao
Published: January 2015

Using intermittent bubbling carbonation method to prepare nanoCaCO3, the effect of crystal orientation agents on the morphology of nanoCaCO3 was studied. The nanoCaCO3 was characterized by means of field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), Laser particle analyzer. The results showed that the different shapes nanoCaCO3 was synthesized by adding different crystal orientation agents to control the shape of the product. The as-prepared CaCO3 were pure calcite crystal and the average particle sizes were within the range of 25.7 to 60.9 nm.
The Research of Thiosemicarbazide Modified as Acidizing Corrosion Inhibitor
Authors: Li Ke Hua , Yang Bing Bing , Lan Zhi Wei , Wang Ren Fang , Su Tie Jun
Published: January 2015

Corrosion inhibition of N80 steel in 15% HCl was investigated in the absence and presence of different concentrations of some thiosemicarbazide derivatives (Mannich baseI, Mannich baseII) by weight loss, potentiodynamic polarization techniques. The adsorption of Mannich bases obeyed Langmuir adsorption isotherm. Both thermodynamic and activation parameters were calculated and discussed. The absorption process of Mannich base corrosion inhibitors on the surface of N80 steel is spontaneous, endothermic and entropy increase process. Polarization curves indicated that the inhibitor of Mannich bases are the mixed corrosion-controlling one which inhibited anodie corrosion. The results obtained from weight loss, Potentiodynamic polarization are in good agreement.
Analysis and Design of Lifting Pole Made of Carbon-Fiber Reinforced Resin Matrix Composites
Authors: Xia Yong Jun , Mei Wen Ming , Hao Yu Jing , Ni Da
Published: January 2015

As a special lifting device, the lifting pole is widely used in construction of transmission line powers. Due to the special working environment, a new-type lifting pole made of carbon-fiber reinforced resin matrix composites is designed to facilitate transportation and usage. It is shown by comparison of material properties that new materials can greatly reduce structural self-weight on the condition of ensuring mechanical properties. In order to ensure the equipment is used safely and reliably, this paper carries out mechanical calculation and ANSYS finite element analysis by setting up a mechanical model, and the results show that the design is reasonable and accords with national relevant specifications.
The Experimental Study on Infrared Dryer for Corn
Authors: Liu Chun Shan , Chen Si Yu , Wu Wen Fu , Wang Jun Fa , Zhou Hai Bo
Published: January 2015

To understand the drying characteristics of corn in infrared drying process, the research of corn post-harvest drying experiment was developed on self-developed infrared grain dryer. Analysing the influence of hot air temperature by blast capacity and the outlet size of air distribution under the full load condition, the change rules of the corn moisture content, the temperature change and the energy consumption characteristics during the drying process have been researched.
The Research Progress of Coagulation Technology on Fine Particles
Authors: Liu Li Ping , Song Guo Dong , Yu Lei
Published: January 2015

This article reviewed some of the measures taken to control particulate matters by combining the latest fine particles dominating technologies both at home and abroad. The coagulation technological principles and research achievements of fine particles were suggested. The research highlightly analyzed the technical principles and characteristics of electric coagulation technology, acoustic coagulation technology, vapor condensation technology, thermal coagulation technology,chemical coagulation technology, magnetic coagulation technology, turbulent coagulation technology and light coagulation technology.On the basis of comprehensive analysis of these technologies, it pointed out the development trend of fine particle control technology.
Study on Microbial Transformation of 11α-hydroxy-16,17α-epoxy progesterone in Ionic Liquid/Water Biphasic System by Arthrobacter simplex
Authors: Yu Lu , Mao Shu Hong , Ji Shao Xian , Lu Fu Ping
Published: January 2015

Dehydrogenated steroids are usually more effective in treating diseases, compared to their precursors. In this study, toxicity of six ionic liquids to the Arthrobacter simplex was investigated to evaluate the possibility of dehydrogenation of 11α-hydroxy-16,17α-epoxy progesterone in ionic liquid / water biphasic system. Results indicated that ionic liquids displayed higher toxicities to the A. simplex. The followed bio-dehydrogenation in biphasic system, as well as the immobilization investigations in the corresponding system, showed the lower conversion ratio of 11α-hydroxy-16,17α-epoxy progesterone. This maybe indicated the unsuitability of the imidazole-based ionic liquid for the dehydrogenation of A. simplex in the biphasic system.
Application of Digital Image Correlation in Measuring Refraction Index of Transparent Material
Authors: Ma Zhao Yang , Qu Ben Ning
Published: January 2015

This article describes a method to measure the refraction index of transparent material by combining the characteristics of transparent material with 2D digital image correlation. The method established the relationship between refraction index and in-plane displacement of speckles using the refraction principle. In-plane displacement can be calculated by the 2D digital image correlation directly. Refractive index of PMMA were obtained by speckle patterns which were recorded by single camera. Results showed that the calculation is very close to the existing PMMA material refractive index value that proved the feasibility and the effectiveness of the method. Of course, this method also can be used to calculate the thickness of the transparent material to widen its using fields.
FEM Modeling of End-Plate Assembling Bolt Connections of CHS Profiles
Authors: Rosmanit Miroslav , Jurčíková Anežka
Published: January 2015

Two different numerical models of the common truss-type assembling joints of CHS (circular hollow section) profiles were created – simplified model of joint and more accurate model which corresponds to the experimental specimens. Models with different end-plate thicknesses and consequently with different failure modes were solved. The results obtained from numerical models were compared with the analytical solution of such joints using the Eurocode procedure recommended in EN 1993-1-8. These results are planned to be verified and further developed based on experimental results.
Time Resolved Emission from Shocked Sapphire at 1.3 Mega-Bar
Authors: Zhang Dai Yu
Published: January 2015

A pyrometer experiment was performed using the dynamic high pressure method; it shows that obvious emission phenomenon had been generated in the shocked sapphire windows. Shock stress in the sapphire was 1.3 Mega-bar. Recorded emission signal with nanosecond resolution at 850nm wavelength reveals nonlinear increase character. A time resolved absorption coefficient α (t) was taken to fit the radiance curve. The value of α (t) indicates that shock induced shear banding could be regarded as the emission source, seems increasing after the shockwave arriving in the sapphire windows.
Correlation between the Force and Magnetic Field of the U71Mn Notched Sample
Authors: Bao Sheng , Gu Yi Bin , Hu Sheng Nan , Fu Mei Li , Zhang Da
Published: January 2015

In this work experiments were carried out to study the evolution of the piezomagnetic field surrounding steel samples with the tensile stress. The piezomagnetic field was recorded by a highly sensitive fluxgate magnetometer of 428D. The piezomagnetic field (B field) and its gradient of the U71Mn steel are compared with the mechanical response. Results show that the piezomagnetic response seems to be a more sensitive indicator of damage than the mechanical one. Moreover, there exhibits correlations between the piezomagnetic response and mechanical response. This research has demonstrated that the piezomagnetic effect can be utilized as a nondestructive method to monitor damage in the rail.
Calculation of Wavelengths, Transition Probabilities and Oscillator Strengths for E1 and M1 Transitions in Cu-Like Au Ion
Authors: Xu Min
Published: January 2015

Wavelengths, transition probabilities and oscillator strengths have been calculated for electric dipole (E1) transitions and magnetic dipole (M1) transitions in Cu-like Au ion. These values are obtained in the configuration interaction (CI) and using the fully relativistic multiconfiguration Dirac-Fock (MCDF) method including quantum electrodynamical (QED) effect and Breit correction. Obtained energy levels of some excited states in Cu-like Au ion from the method are generally in good agreement with valuable theoretical and experimental results. The calculation results indicate that for high-Z highly ionized atom, some forbidden transitions are very important.
Conical Tip Wear in Transition Deformation – Wear Map Construction under Cyclic Impact of Hardness Ceramic Materials
Authors: Tiganesteanu Constantin , Capitanu Lucian , Florescu Virgil
Published: January 2015

Penetrator tip wear was investigated on an apparatus testing the impact on hard ceramic materials. The experimental tests were done on a vertical impact computerized test bench of original conception. Tapered diamond and carbide-metal pins were used as penetrators. It was noticed that in some situations the tip of the penetrator remained stuck in its target, acting as a Morse cone, due to the friction force between the penetrator and its target being higher than the reaction force of the collision between the two objects. This has led us to choose an angle of 1060 at the tip of the penetrator cone. For most tests we used a maximum strength of 40 N and a sintered carbide impact pin with a 1150 HV 30/15 hardness. For the study of the penetrator tip wear we have used a granite tile that owing to its high hardnes has enabled a noticeable wear of the tip. We have established a method and an algorithm for calculating the tip wear, based on images captured under a microscope after testing. A general finding is that in all tests, besides the cyclical impact deformation and the wear of coating that were tested, the wear of the tip of the pin which applies the impacts is also noticeable regardless of its shape (spherical, conical, etc), so much so that for a large number of cyclical impacts the pin tip wear must be taken into account. Variation curves are presented in the volume of wear material and of the maximum pressure p0 at the tip of the impactor, depending on the number of impacts. From the variation curve of the wear volume of material according to the number of impacts we’ve established an analytical relationship for the wear of the tip. A logarithmic formula allows for a relative assessment of the extent to which the tip is worn, as a function of the total number of incurred impacts.
Optical Breakdown on the Inclined Target: The Features of the Erosive Plume Formation
Authors: Ilyin Alexey , Nagorny Ivan , Biryukova Yulia
Published: January 2015

For oblique incidence of laser radiation on the target, the breakdown of air and erosive jet are separated in time and space. The electron density is higher in the air breakdown area while Al I density is higher in an erosive plume area. We also defined plasma expansion mechanism and estimate the time of erosive plume formation.
Study on the Manufacturing Process of Polymer Microfluidic Chip with Integrated Cu Micro Array Electrode
Authors: Gu Yao Xin , Qiao Hong Chao
Published: January 2015

To produce perfect polymer microfluidic chip with integrated metal micro array electrode, an oxygen-plasma assisted manufacturing process was developed. The Cu micro array electrodes on the poly substrate was formed by photolithography, sputtering and wet etching; the micro channels on the polymer plate were hot-embossed using metal master; the bonding of cover plate and substrate using thermal bonding. The surface of the polymer plate with micro channels was treated by oxygen-plasma before thermal bonding. The oxygen-plasma treatment could decrease thermal bonding temperature from 100 °C to 85 °C. The bonding of this chip is complete, the micro electrode array keeps its integrity, and the micro channel is not distorted obviously.
Research on the Deformation of the Steel Piles on the Soft Soil
Authors: Zhou Hong Xing , Zhi Peng , Zhou Han Bin
Published: January 2015

Recently, the steel piles have been applied for the all engineering field. But the deformation law of the steel sheet piles has the lack of research. So with the help of one project, the article analyses the monitoring data. And compared with the numerical simulation, the research on the deformation law and influence factors of the steel sheet piles are carried on. It lay the good foundation of the experiment.
Study on the Impact of Crashworthiness Materials on the Crashworthiness Capacity of Double Hull Ship
Authors: Li Dan , Gui Hong Bin , Shi Jiang Hai
Published: January 2015

Improving the crashworthiness of ship is an important guarantee for ship security. To fill different materials in the shipboard structure or attach fender devices outside the shipboard are important measures that can improve the crashworthiness of ship. They are boiled down to the use of crashworthiness materials, and the impact of crashworthiness materials on the double side ship is classified as the changes of shipboard structure elastic modulus, and then this paper carries out an analysis of the impact of the changes of various parts’ elastic modulus of the shipboard structure on the crashworthiness of ship, and the computing result shows that to lay crashworthiness materials on the sheet metal can improve the structure crashworthiness before the rupture occurs, some useful conclusions about the material impact on the crashworthiness of ship are obtained.
The Research of Similar Material and Dosage in Blasting Model Test
Authors: Zhao Hang , Li Xin Ping , Dong Qian
Published: January 2015

Taking the surrounding rock of deep-buried at the Jinping II Hydropower Station as the engineering background,the research of similar material and dosage in blasting model test are carried out,based on the scaling method of Froude,the specific parameters of the model materials is determined;through indoor test,different ratio of model material standard specimen was carried out by mechanical test,the mix of similar material is got to simulated the actual rock;base on the theory of explosive stress wave,the research of the similar quantity is carried out.The results shows:froude can be applied to the theoretical calculation of the similar material in the experiments;the acoustic velocity and the strength of the model materials decreased with the increase of water paste ratio;using gypsum,water,sodium phosphate polymer(1-0.62:0.55%) applied to deep marble similar material in laboratory model test;corresponds to the actual blasting engineering 500 kg, 800 kg of similar explosive dosage for 60 grams, 90 grams.
Acceleration Data Acquisition and Analysis Method of Shaking Table Test
Authors: Chai Shao Feng , Wang Ping , Wu Zhi Jian , Wang Jun , Che Gao Feng
Published: January 2015

Shaking table test is an important means of simulated earthquake in laboratory, slope shaking table test data provide a scientific basis for analysis of dynamic stability and instability mechanism of slopes. Sine vibration table test data processing is different from general frequency domain analysis method, need real-time data processing in time domain. Taking the sine sweep test conditions, which is one of the conditions in "Earthquake landslide and slope prevention and control technology research on shaking table test", as an example. Describes the layout of sensors in shaking table test and the reasons; Sine sweep test load and aim; and listed the steps and methods of the sine sweep test in data processing; Through the processing and analysis of test data identified the vibration frequency of model and shaking table system is 30Hz, damping ratio is 2.06%; Analysis and calculation of the different sections of the slope and position of the amplification coefficient. A methodological guidance for shaking table test and dynamic response analysis of the slope is provided.
The Influence of Sag on Vibration Modal of Suspended Cable
Authors: Zhang Lu Fei , Liu Xiao Hui , Yan Bo
Published: January 2015

The cable structure has been wildly applied to all kind of engineering structures. So, the accurate analysis of the dynamic features of the cable structure is particularly important. In this paper, the finite element model of suspended cable was established by ABAQUS software, cable element and beam element were used respectively to study in-plane and out-of-plane modal variation with sag according to different span and dip angle of suspended cable, the influence of bending rigidity on modal are obtained. Finally, a comparative analysis with the classic linear theory of vibrations of a small sag suspended cable should be done to determine the applicability of this theory. Modal analysis is the basis of model superposition method. It has important theoretical significance to research the impact of sag on modal to vibration control for large-span suspended cable.
The Mechanism of the Noise Transmission in the Carbody of High-Speed Trains
Authors: Guo Jian Qiang , Ge Jian Min , Sun Zhao Jin , Deng Xiao Jun , Liu Shao Qing , Zhao Yan Ju
Published: January 2015

To get the noise transmission mechanism in the carbody is the precondition for noise control. In order to study the noise transmission mechanism in the carbody of the high-speed trains, the relationship of the sound pressure level (SPL) and the vibration level (VL) was analyzed base on plane sound wave, and then a special test bench in laboratory was built to evaluate the relationship. Concentrated force load and sound load wre used in the experiment. First, the “SPL-VL” formulas in every one-third octaves were found under force load. Then the sound load test was used to evaluate the formulas. The result indicates that the noise radiated by the structure bending vibration accounts for a large proportion of interior noise in the special multilayer thin-wall carbody of high-speed trains. Damping treatment is used for further instructions.
Application Analysis of Dynamic Pressure Damper in Hydraulic Systems
Authors: Mao Xu Yao , Peng Yun Fei , Wu Chao , Hu Jun Hua , Ding Hong Yuan
Published: January 2015

Typical hydraulic systems with inertia executive components like hydraulic cylinders are generally low in damping and lack of stability. Adding DPD to systems is an easy and effectual method to solve these problems. The performance of a mechanical dynamic pressure feedback DPD applied in a common hydraulic system was simulated while the influences of the structure and system parameters on DPD and the system were analyzed. Further research on characteristic optimization was carried out by adding accumulators to DPD. It shows that the DPD can practically improve the system stability and contain the pressure impact. The accumulators should be set appropriately before the damping orifices and have a certain ability to absorb pressure impact.
A Test Method and Test Codes Generator for Improved HT Fault Model Based on NoC
Authors: Zhang Yu Zhu , He Yi Gang , Yuan Li Fen , Liu Mao Xu
Published: January 2015

NoC is a expand for SoC.The architecture of NoC is huge and complex,it leads to the crosstalk fault between internal transmission of NoC increasingly serious. Crosstalk serious impact on the signal integrity of on-chip system.A new test codes generator was designed by PSpice simulation software based on improved HT model. The generator was composed of a 16-bit counter and a 16-bit data selector.The generator was tested by PSpice software,the result showed that it satisfied the test requirements and had the advantage of portable. A crossstalk test method was proposed in this paper,we used this method on a test circuit,the result showed that the method could reduce the number of tests and save resource effectively.
Seismic Vulnerability Analysis of FRP Retrofitting Industrial Buildings
Authors: Zhu Jian , Tan Ping , Chang Pei Ju
Published: January 2015

This study focus on derivation of such vulnerability curves using Fiber Reinforced Polymers technologies retrofitted conventional RC industrial frames with masonry infill wall. A set of stochastic earthquake waves which compatible with the response spectrum of China seismic code are created. Dynamic time history analysis is used to compute the random sample of structures. Stochastic damage scatter diagrams based different seismic intensity index are obtained. Seismic vulnerability of FRP-reinforced RC industrial frames is lower than unreinforced frames obviously, and seismic capability of frames using FRP technologies is enhanced especially under major earthquake.
Full-Size Seismic Experiment Analysis on the Timber Structure in Rural Areas
Authors: Wang Pu Qing , Dou Yuan Ming , Li Yan Tao , Zhang Jing Jing
Published: January 2015

Timber structure seismic analysis is an important problem in structure design and safety of building. In this paper, full-size pseudo-static tests of two single-storey and single bay timber frame with and without infilled wall were carried out. Failure process, failure form and deformation capacity were investigated. The test results indicate that the timber frame has better capability of dissipation of seismic energy. The infilled wall can increase the seismic ability of the whole timber frame structure. There is a good collaborative mechanism between the infilled wall and frame under some construction measures.
Numerical Simulation of Construction of Super-Large Deep Soft Soil Foundation Pits and Analysis of its Spatial and Temporal Effects
Authors: Wang Xiao Qin , Sun Ting Ting
Published: January 2015

The constitutive relations of soil in the super-large deep foundation pit project and the law of interaction between soil and the support structure were studied. The excavation of the foundation pit was simulated. The coupling of soil and the support structure and the change in earth pressure with the progress of excavation were analyzed, and the scope of influence of foundationsubsidence was obtained.
Pile Foundation In Situ Test in Seaside Soil-Squeezing Backfill Zone
Authors: Liu Li Bo , Li Hai Bo , Liu Ya Qun
Published: January 2015

Design and construction of pile foundation in seaside zone face the specific geotechnical conditions. The in-situ geotechnical tests need to be conducted. The quality feature of the piles is assessed according to the results of in-situ small strain test, coring test and pile stress test. For different depth of rock and soil stratum and pile bearing layer, the trial pile stress distribution results and follow-up stress and settlement monitoring provide engineering parameters for design and pile-driving.
Influence of Reaction Temperature on the Densification Behavior of the SiC/B4C Composites
Authors: Zhang Yun Long , Zhang Yu Min , Li Cheng Hai , Li Jin Ping
Published: January 2015

In this investigation, the rare-earth oxide La2O3 combined with Al2O3 served as sintering additives and commercial α-SiC and B4C powder were applied to fabricate SiC/B4C composites by pressureless sintering. The results proved that combination of Al2O3 and La2O3 sinter additives were effective for densification of SiC/B4C composites. The influence of sinter temperature on the phase constitution, micro-structure and densification behavior of SiC/B4C composites was investigated.
Study on Esterifying Conditions of Shrinkage Reducing Monomer
Authors: Tang Shi , Zhang Lei
Published: January 2015

One system of Shrinkage reducing monomer was prepared by esterification reaction, the test method of esterification rate was discussed, to find out the significant factors of the esterification rate by using the orthogonal design. The influence of ether-to-acid mole ratio, reaction temperature, catalyst dosage and reaction time on the esterification was also investigated. The results demonstrate that the suitable esterifying conditions mainly require the suitable proportion of MA to C5H12O3 as 1~1.05 to 1, and under the temperature of 120~125°C, and 3~3.5hours of reaction time.
Experimental Research on the Conductive Property of MWCNT Nanopaper
Authors: Zhang A Ying
Published: January 2015

This paper presents a systematic study of the nano-sized structure and temperature dependent electrical properties. A method of synthesizing the self-assembled multi-walled carbon nanotube (MWCNT) nanopaper on hydrophilic polycarbonate membrane was explored. The process is based on the very well-defined dispersion of nanotube and controlled pressure vacuum deposition procedure. The experiment results show that the ratio changes of MWCNT in the nanopaper could lead to the changes in the electrical conductivity efficiency of the nanopaper. Furthermore, the electrical resistivity of MWCNT nanopaper decreased as temperature increase.
Comparison of the Capacity of Chitosan and Iron Hydroxide Flocs for Phosphate Adsorption in Seawater
Authors: Chen Kai Li , Jin Wei , He Xin
Published: January 2015

Adsorption is proposed as an effective method for phosphate removal in real seawater with low phosphate concentration. This paper aimed to investigate the capacity of chitosan and iron hydroxide flocs for phosphate adsorption in real seawater, and the results shown iron hydroxide flocs had better performance of phosphate adsorption than chitosan.
Distribution and Optimization of Residual Stress Fields in Titanium Simulated Blade Treated by Laser Shock Peening
Authors: Luo Si Hai , He Wei Feng , Nie Xiang Fan , He Guang Yu , Jiao Yang
Published: January 2015

According to the characteristics of mechanical response of titanium alloy, a new constitutive model for ultra-high strain rate deformation in the process of laser shock peening was established. The constitutive model parameters were obtained by the inverse optimization. The propagation characteristic and residual stress-strain distribution under the shock wave were analyzed. The relationship between residual stress and laser power density and laser impacts was indicated via sensitivity analysis of laser parameters. According the above conclusions, the laser shock peening technic on the titanium simulated blades was optimized to obtain the appropriate residual stress distribution. The fatigue test result indicated that the fatigue strength by the optimized technic was improved by 25%, compared to the anterior technic without optimization.
Effect of Static Magnetic Field on the Main Textures Development of Grain-Oriented Silicon Steel in the Primary Recrystallization
Authors: Lu Zheng , Li Li Juan , Zhai Qi Jie
Published: January 2015

The 87% rolling reduction cold-rolled grain-oriented Fe-3%Si steel (Hi-B) was selected as the experimental materials. As the condition of Goss component in primary structure plays a significant role for its abnormal growth in the subsequent secondary recrystallization, static magnetic annealing was used to affect Goss texture and another main texture (111)[112] development in primary recrystallization in this article. It is found that magnetic field annealing can alter the texture development to a certain extent.
Influence of EDTA-2Na Concertration on the Microstructure and Corrosion Behaviors of Mg-Al-Y Alloy
Authors: Zhang Yun Long , Li Mu Qin , Liao Ping , Zhang Yu Min
Published: January 2015

In this paper,the micro-arc oxidation technology were utilized to fabricated the oxidation coating in order to resolve the corrosion resistance of the Mg-Al-Y alloy. The EDTA-2Na solution was introduced into the electrolyte solution for improving the coating corrosion properties.After the micro-arc oxidation process, phase structural, surface morphology and corrosion resistance of the MAO coating of Mg-Al-Y alloy were performed by XRD, SEM and Potentiodynamic polarisation measurements. The introduce of EDTA-2Na in the electrolyte solution improve the positive potential and reduced the corrosion current, which would improve the corrosion resistance properties of the Mg-Al-Y alloy.
pH-Sensitive Materials with Controllable pH Phase Transition Value
Authors: He Wei , Huang Xiao Nan
Published: January 2015

Novel pHsensitive methacrylate-based (co)polymers with pendent tertiary amine groups were prepared by free radical polymerization of monomer 2-(dimethylamino)ethyl methacrylate (DMA) and 2-(Dibutylamino)ethyl methacrylate (DBA). These polymers are pH sensitive in aqueous solution, which was studied by titration, transmittance measurements experiment. The pH responsive polymers dissociate at lower pH value because of the electrostatic repulsion and aggregate above their pH responsive value induced by hydrophobic interaction of pendent group. The pH responsive value of (co)polymers can be controlled by ratio of DMA and DBA. These novel polymers have great potential application for biomedicine.
Research on Shrinking Performance of Recycled Asphalt Pavement Material Stabilized with Inorganic Binder
Authors: Peng Bo , Li Wen Ying , Yin Guang Kai , Cheng Zhi Hao
Published: January 2015

This paper studies on shrinkage performance of recycled asphalt pavement (RAP) material blended with inorganic binder such as cement, lime-fly ash (lime and fly ash) and three ashes (cement, lime and fly ash), with certain intensity used as base course. The erosion, dry shrinkage and temperature shrinkage tests were conducted on the recycled asphalt pavement (RAP) material blended with the three kinds of inorganic binder, to evaluate and compare different types of cold recycled inorganic material shrinkage resistance capability and anti-erosion properties. After analyzing the fatigue test result of three-additives-stabilized recycled mixture, it showed that the recycled pavement mixture owned preferable anti-erosion properties, anti-temperature shrinkage resistance and anti-dry shrinkage performance.
Study on the Tensile Properties of Glass Fiber Reinforced Poly Cyclic Butylene Terephthalate Composites under and after High Temperature
Authors: Zhang Lu , Wang Zhen Qing , Zhang Ji Feng , Zhou Li Min
Published: January 2015

A fatal disadvantage of continuously reinforced thermoplastic composites is the high melt viscosity of the matrix which hampers impregnation. However, the melt viscosity of low molecular weight cyclic butylene terephthalate resin can reach extremely low value, which simplifies impregnation and even allows for the use of thermoset production techniques resin transfer moulding. To solve the problem of the glass fiber reinforced poly cyclic butylene terephthalate composites applied in the environment of high temperature, the specimens of composite laminates were tested under and after different temperature. It has been observed that the tensile properties of GF/PCBT composites decrease with increasing temperature between room 25°C and 150°C and tend towards stability after the high temperature.
Numerical Simulation of Dynamic Process under Low Pressure Casting Based on Two Phase Flow
Authors: Liu Shan Guang , Cao Fu Yang , Zhao Xin Yi , Jia Yan Dong , Ning Zhi Liang , Sun Jian Fei
Published: January 2015

It has been proved that the mold filling under low pressure casting can be described by the second order nonlinear differential equations characterized by damping oscillations. To obtain higher accuracy of the velocity field, the mold filling process with damping oscillations should be considered. A computational model taking the liquid level droping in the crucible into account based on two phase flow for filling process of damping oscillations is presented in this paper. Hydraulic simulation with the particle image velocimetry was adopted to verify the numerical simulation result. It is proved that the nemuerical simulation results used the presented model perfecly match with the particle image velocimetry results. Liquid level droping in crucible is the main reason for damping oscillations in mold filling. Velocity oscilations can be eliminated when the melt flow across a sudden expansion section. The detailed flow field based on the presented model can provide guidance to optimize the process parameters.
Experimental Study on Force of Stinger Cutter Breaking Rock
Authors: Sun Yuan Xiu , Zou De Yong
Published: January 2015

Singer PDC cutters of five different cone top diameters are designed and manufactured.On the basis of rock-breaking test with stinger PDC cutters, effects of significant factors on cutting forces are discussed, including cutting angle, cutter shape and rock hardness. The test results show that the stinger PDC cutters have the ability of drilling hard rock.The sharper the stinger PDC cutter is, the stronger the ability of drilling the formation will become.15°is an optimal front rake angle.