bluuebunny/crossref_metadata_2025 huggingface dataset:
Interface Constraint Effect and Stress Relaxation in Nano-Sandwiched Thin Film
Authors: Chang Geng Rong , Ma Fei , Ma Da Yan , Xu Ke Wei
Published: March 2013

Micro-particles and nano-wires, small outgrowths were found to appear on upper film surface when metal thin film is confined between two Si3N4 layers deposited by magnetron sputtering and is annealed at an appropriate temperature. The stress evolution during this process is monitored by multi-beam optic stress sensor, and is qualitatively interpreted in terms of elastic and plastic deformation, as well as bulk diffusion. Additionally, the interface constraint effect among different layers is explored. Stress relaxation of nano-sandwiched thin films behaves in different stress modes. As a comparative study, Si3N4/Zn/Si3N4 sandwiches were prepared and studied by the same method. Experimental results show that the pertinent geometry is strongly dependent on material types and stress states of the substrates. Finally, an appropriate mode was suggested to interpret this phenomenon.
Surface Crystalline Phase and Basicity of MgO/ZrO2-La2O3-y Solid Base Catalyst
Authors: Su Yu , Wang Peng , Gao Jin Sheng
Published: March 2013

MgO/ZrO2-La2O3-y solid base catalyst was prepared by precipitation immersion process. Raman spectroscope and X-ray powder diffraction (XRD) were used to determinate the surface phase and bulk phase of solid base catalyst. Temperature programmed desorption of CO2 (CO2-TPD) was employed to study the surface basicity of the catalyst. The results reveal that Mg2+ ion plays a key role in the stabilization of tetragonal phase ZrO2 not only in the bulk but also on the surface of catalyst when the Mg/Zr molar ratio is 0.4. The doping of La2O3 has the role of improving the dispersion of the active component MgO on ZrO2 surface, consequently resulting in the improvement of the catalytic activity of the catalyst rather than stabilizing tetragonal phase ZrO2.
A Compensation Method of Abrasive Surface Error Based on the Piezoelectric Feed
Authors: Wu Fei , Chen Xiao Jian , Jin Jia Mei
Published: March 2013

The piezoelectric ceramic has inverse piezoelectric effect, which can be used in the manufacture of the mold internal compensation-driven. We design a multilayer structure with built-in array of piezoelectric ceramic to achieve active deformation to compensate the tool-shaped face. A piezoelectric micro-displacement compensation model is proposed based on the inverse piezoelectric effect of piezoelectric ceramic. According to the initial face error of tool or from wear, a certain amount of DC voltage is applied on the corresponding area of the piezoelectric ceramic elements to produce certain amount of shrinkage, achieving the goal to adjust tool surface. Based on this theory, we develop a device with active deformation compensation and propose an optimization algorithm of applied voltage.
Hydrothermal Synthesis of Well-Aligned ZnO Nanorod Arrays on Silicon
Authors: Xu Tian Ning , Lu Zhong , Sui Cheng Hua , Wu Hui Zhen
Published: March 2013

Zinc oxide (ZnO) nanorod arrays were fabricated on ZnO:Al seeded Si substrates with various reaction temperatures using a low temperature hydrothermal method. The morphology and structure of ZnO nanorod arrays were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). It reveals that the ZnO nanorods grow vertically on Si surface with (002) preferential orientation. The transmittance spectra show the ZnO nanorod arrays fabricated at low temperatures have high transmittance in the visible region and decrease with reaction temperature increasing. Moreover, the same trend was also observed in the reflectance spectra of the ZnO nanorod arrays. The optimal reaction temperature is of 120 °C for ZnO nanorod arrays with high transmittance (~80%) and low reflectance (~10%) in the visible region. The superior optical properties make ZnO nanorod arrays promising for applications as transparent electrodes.
The Effect of Lithium Source on the Electrochemical Performance of LiFePO4/C Cathode Materials Synthesized by Sol-Gel Method
Authors: Hu Zhi Qiang , Yang Dong Xue , Yin Ke Jian , Liu Jing Xiao , Li Fei , Gao Wen Yuan , Qin Ying , Liu Hua
Published: March 2013

LiFePO4/C cathode materials were synthesized by Sol-gel method under the same process conditions using different water-soluble lithium source (LiOH, Li2CO3, LiNO3). The phase of synthesized powders were characterized by XRD; and the electrochemical performance of the material was investigated by measurements of cyclic voltammetry, AC impedance measurements, charge and discharge. The results show that the synthesized LiFePO4/C using LiOH as the lithium source has high electrochemical reversibility and low internal impedance. The specific discharge capacity is 147.5mAh/g under the discharge at 0.2C rate. It also has high stability of cycle capacity, and almost no attenuation after 30 cycles. So it has the excellent electrochemical performance.
In Situ Synthesis and Tribological Behavior of Copper Nanopieces in Liquid Paraffin as Additive in Mobil 1 5W- 30 Lubricating Oil
Authors: Zhang Xi Feng , Li Ke Wei , Zhou Ying , Cheng Xiao Nong
Published: March 2013

To synthesize morphology- controlled nano- copper with excellent lubrication properties as lubricant’s additive, chemical reduction synthesis method was used coalescing in situ via liquid paraffin as resolvent and modification with polyethylene glycol (PEG-2000). The as- prepared Cu nanopieces with 35.59 nm average length and 21.03 nm average width were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The tribological behavior of Mobil 1 5W-30 lubricating oil with nano- Cu were measured by ball- on- disk UMT- Ⅱ tribometer and analyzed by SEM and EDS. It is found that the tribological performance of Mobil 1 5W- 30 with nano- Cu is improved, and the optimization addition is 0.4% (Cu wt) with the lowest friction coefficient.
Synthesis of Hollow ß-Phase GeO2 in Microemulsion
Authors: Zou Xu , Liu Bing Bing , Wu Wei , Li Dong Mei , Li Quan Jun , Li Ze Peng , Liu Bo , Mao Ho Kwang
Published: March 2013

We fabricated mono-dispersed hollow waxberry shaped ß-quartz GeO2by a facile one-step synthesis in emulsion at room temperature. TEM images indicated that hollow waxberry shaped GeO2were consisted of nano-sphere whose average size were estimated to be 20 nm. The growth mechanism and optical properties of the products were also investigated. The possible formation mechanism of the hollow interior is proposed as the Ostwald ripening. The optical properties of the ß-GeO2nanoparticles with hollow shapes were also studied with photoluminescence spectrum, which reveals a broad emission, suggesting potential applications in electronic and optoelectronic nanodevices. These attractive results provide us a new simple method further used to fabricate other specific hollow structure and indicate hollow waxberry shaped GeO2may have potential applications in light-emitting nanodevices.
Self-Assembly of Aligned Multi-Walled Carbon Nanotubes in Polypropylene-Coated Multi-Walled Carbon Nanotubes Composites
Authors: Xiong Yi Na , Chen Xiao Hua , Huang Qun , Xu Long Shan
Published: March 2013

Polypropylene (PP)-coated multi-walled carbon nanotubes (MWNTs) composite with MWNTs exceptional alignment dispersed and improved mechanical properties was prepared with maleic anhydride (MAH) as a compatibilizer and poly (butyl methacrylate) (PBMA) as a binding. Scanning electron microscopy (SEM) results showed that MWNTs within composite were aligned without aggregation and the oriented MWNTs were connected by matrix. High-resolution transmission electron microscopy (HRTEM) results demonstrated that the nanotubes were densely coated with a PP layer. Infrared spectroscopy (IR) results revealed that there was covalently linkage of MWNTs with PP via MAH. The interactions between MWNTs-PP and MWNTs-PBMA induced orientation of MWNTs. The improved mechanical properties of PP - coated MWNTs composite was also shown.
Microwave Synthesis and Characterization of Europium Complexes with Cinnamic Acid and 2, 2' –Bipyridine
Authors: Wang X.J. , Zhou X.C.
Published: March 2013

A novel material synthesis technique, microwave process was investigated for the production of phosphor powders. In this study, we have developed a new method to product phosphor powders, and applied this process into one materials fabrication. EuDL3 where L is cinnamic acid (C6H5CH = CHCOOH, HL), D = 2, 2' – Bipyridine (bipy) phosphor powders were successfully synthesized by microwave process. The process takes only 24 min to obtain phosphor powders. The resultant phosphor powders were investigated by TG – DTA, IR, luminescence spectroscopy, and scanning electron microscope (SEM).
Monitoring on GBT Series Small Flow Pump Shell Long Position of Computer-Aided Process
Authors: Wang X.J. , Fu X.G.
Published: March 2013

GBT Series Small flow Pump body long position complex shape, size, high precision manufacturing process complexity, the process is prone to waste, the use of computer-aided process control, by means of the signal characteristics of the collection, analysis and processing of information, the timely issue of warning signal or direct feedback to the error correction processing equipment to ensure product quality and processing operation of the system reliability.
Research on Five-Axis CNC Machining Simulation and Experiment of Integrated Impeller Based on VERICUT
Authors: Du W.G. , Guo Y.Y. , Zhao C.
Published: March 2013

Machining with five-axis equipment can offer manufactures many advantages, including dramatically reduced setup times, lower costs per part, more accurate machining and improved part quality. While in five-axis machining, the tool axis changes frequently, even the most experienced engineers are difficult to judge the correctness of its tool path. So in this paper, taking five-axis machine tools as the prototype, the process of building NC simulation platform was introduced by using simulation software VERICUT. After that, it introduced simulation operations, verifying the simulation platform and data simulation function. Finally, the correctness of the simulation was verified by machining experiments. Researching CNC machining process on the VERICUT platform, the research results were used in five-axis machining simulation of integrated impeller and it improved both the process capacity and efficiency of the integrated impeller greatly. This method obtained in this paper could eliminate the colliding and interference phenomenon during test cut, reduce costs, improve the efficiency of programming and shorten the manufacturing period.
Research on Stability of High Speed Milling System
Authors: Guo Y.Y. , Lei H. , Zhao C. , Sun C.T.
Published: March 2013

Machining instability is often the limiting factor on metal removal rate. So the stability of cutting system is an important research in high-speed machining area. It is widely used in engineering practice. In this paper, the stability of high-speed milling was studied by the numbers aiming at the dynamic milling process model of ball-end mill. The dynamic model of high-speed milling process was established. On the basis of Altintas’s theory, the formula about the limit axial depth of cut was derived. Besides, the model parameters of the system were obtained and the accuracy of the stability lobes diagram was verified through the experiments. From this research, it was learned that structure parameters of machine tool-cutting tool system, cutting force coefficients, spindle speed and axial depth of cut were factors affecting the stability in high-speed cutting. And the obtained stability lobes diagram provided a reliable basis in selecting cutting parameters during tool path planning.
Design of the Visualization Automatic Control System on the LPG Shuttle Kiln
Authors: Wang X.J. , Fu X.G.
Published: March 2013

By the design of the visualization system of the LPG shuttle kiln, the friendly man-machine interface is achieved, which is helpful for the change, expansion and upgrade of the system. It is studied that the general schemes of the visualization automatic control system of the LPG shuttle kiln in this article. The choice of the hardware devices, especially the system nucleus units including temperature transducer, A/D or D/A intelligent module, RS232/485 converter, relay, actuator, etc, and the connection and control strategy of the hardware of the control system, is analyzed emphatically. A/D or D/A intelligence module, RS232/485 converter, relay, actuator, the joint and control strategy of the hardware of the control system, etc. With the widely application of the intelligence control system, the foreground of the visualization system of the shuttle kiln will be better and better.
Study on Optimal Design of a Drillers’ Gear Box Using Method of Grey Classification
Authors: Li Xiao Ping
Published: March 2013

Grey Classification is a method which can judge and analyses the matter in the Grey System .It is more reasonable and practical than other ways. In this paper, we studied the Grey System and Grey Classification. Basing on the traditional method of multiple targets optimal design of driller’gear box, we found out the most satisfactory results which is more optimal than others by using the method of Grey Classification.
Effects of Nano-Al2O3p on Hot Corrosion Resistance of NiCoCrAlY Cladded Coatings
Authors: Wang H.Y. , Zuo Dun Wen , Li X.F. , Wang M.D. , Yu Y.P. , Yuan X.M.
Published: March 2013

Three NiCoCrAlY cladded coatings reinforced by different contents of nano- Al2O3p and one without nano-Al2O3p were prepared on a Ni-base super alloy using laser cladding technique. Hot corrosion of the NiCoCrAlY coatings in Na2SO4/K2SO4 (75:25, wt. /wt.) mixture was performed at 1050 °C in static air. The effects and influencing mechanism of nano-Al2O3p on the hot corrosion behavior of the coatings were discussed. Results indicate that the hot corrosion resistance of the coatings with nano-Al2O3p is better than that of the one without nano-Al2O3p, among which the one with 1.0 wt. % nano-Al2O3p presented the best hot corrosion resistance. The improvement of the hot corrosion resistance is largely due to the refinement of the microstructure after adding nano-Al2O3p.
Fitting Ellipse Based on the Dual Conic Model
Authors: Zhao C. , Fu Mao Li , Cheng J.T.
Published: March 2013

This paper presents an operator that fitting the parameters of ellipses features, and improves the computational efficiency. Based on the dual conic model, this operator directly uses the raw gradient information in the neighborhood of an ellipse’s boundary, which use tangent lines and to apply the estimation in the dual space, so that avoiding the step of precisely extracting individual edge points. Moreover, under the dual representation, the dual conic can easily be constrained to a dual ellipse when minimizing the algebraic distance. The operator presents low sensitivity to noise and is compared to other estimation approaches, which shows good results, the accuracy of this operator is the highest, the time of this operator is moderate that compared with the other methods, and fall within acceptable levels, and in the case of noise or blur, the algorithm have shown very good robustness, in the practical environment can fit the parameters of the ellipse accurately.
Influence of Air Damping on Nanoelectro-Mechanical Switches in Low Vacuum
Authors: Gong Na , Liu B.G. , Liang Y.C.
Published: March 2013

In order to treat the performance of nano-electro-mechanical (NEM) switches in low vacuum, molecular dynamics model of NEM switches is established and the influence of air damping on NEM switches is investigated. When the pressure in low vacuum is from 100Pa to 1000Pa, we get the gas molecule in low vacuum belong to free molecule flow. Tersoff-Brenner potential function is used to describe the interaction of carbon nanotube atoms. L-J potential function is adopted to state the interaction between carbon nanotube and the base ground. Results show that in low vacuum condition, when the same amplitude change of intensity of pressure, the lower intensity of pressure change will take a more clearly effect for the nano structure than the higher intensity of pressure change. Results also show when the length of carbon nanotube from 200 circles to 50 circles, the beam vibrating amplitude increased gradually. When the length is 50 circles, the vibrating amplitude reach the maximum. With the beam length keep to decrease, the vibrating amplitude becomes weak crossly.
Dynamic Test and Analysis of Double Curved Arch Bridge Based on Ambient Excitation
Authors: Wang Li Xian , Di Sheng Kui
Published: March 2013

Dynamic test of double curved arch bridge based on environmental incentives. And Peak value method stochastic subspace identification method is used for modal analysis, and bridge modal parameters are obtained. The results were compared with the finite element software Midas civil, and results are consistent. The test shows that the bridge modal parameters can be identified in the environmental stimulus response. Measured frequency is lower than the finite element calculation of frequency; it means the bridge stiffness is lower. The identified dynamic properties can be served as the basis in the finite element model updating, damage detection, condition assessment and health monitoring of the bridge.
Influence of Concrete Shrinkage and Creep on Composite Beam of Cable-Stayed Bridge
Authors: Hu Xu Hui , Zhong Ning , Jing Shi Hong
Published: March 2013

Based on the shrinkage and creep theory model of the JTG D62-2004 and trough the finite element analysis software, it is to respectively calculate the main span displacement and the upper and lower edge stress of the steel beam and the concrete slab under the impacts of concrete shrinkage and creep at the initial stage and the normal operation stage (with 10 years of shrinkage and creep calculated) for the steel-concrete composite deck system of the cable-stayed with a main beam of 436m.The results show that the effects of the shrinkage and creep can’t be ignored.
Study on Strata Behaviors of the Coal Face with Sublevel Caving in Hugely-Thick Coal Seam in Qianqiu Coal Mine
Authors: Zhai Xin Xian , Zhai Yan Wei , Zhang Shi Wei
Published: March 2013

Qianqiu Coal Mine, Yima Coal Group Company Limited, China, has been mining the gently-inclined and hugely-thick coal seam #2-3. The overburden above the coal seam has hugely-thick conglomerate strata with more than 400m thickness, which has significant effects on the strata behaviors of the coal face with sublevel caving. Therefore, study on strata behaviors has an important practical significance to surrounding rocks control and safety production at the coal face. Using theoretical analysis and field observation methods, the following conclusions can be drawn: (1) the surrounding rocks of the coal face with sublevel caving belongs to difficult control one, i.e., it is the surrounding rocks control of roof and floor at the coal face that is difficult. At last, hydraulic supports with sublevel caving of pattern ZF7000-18/28 and their reasonable matching equipment were chosen. (2) The law of strata behaviors of the coal face was observed. Strata behaviors of the coal face were significant and inconsistent at different coal face zones. The parameters of roof weighting interval and roof weighting strength at the coal face were obtained. The maximum value of supporting resistance during periodical weighting was 4307.70kN, being 61.54% of supports rating resistance. Therefore, the supports at the coal face had a higher reliability. Mine production-model with one-mine and one-face can be realized, which promotes the construction of a modernization mine with high production and high efficiency.
Research Situation of Large Deformation Mechanism and Prevention-Control Measures of Surrounding Rock in Tunnel
Authors: Tang Liang Qin , Zang Ya Jun , Tang Kui
Published: March 2013

The tunnel and the understructure works are excavated in the rock or the soil. In comparison with surface engineering, design construction and maintenance of understructure works are more complicated. Especially, after the underground rock or soil is excavated, the large deformation which generated by the crustal stress field change, will bring the great difficulty for supports and protections of surrounding rock. Based on this fact, this paper introduces the current research of formation mechanism of surrounding-rock large distortion that was met in the construction and operation of the tunnel and understructure works, and the prevention measure that was adopted at home and abroad currently. New knowledge is acquired through study; this will draw very useful reference to deeply-buried long tunnel construction in the future.
Study on Shear Performance and Construction Technology of the Stress Absorbing Layer in Underground Road Composite Pavement
Authors: Zhang Cai Li , Li Ning Li , Xiao Qing Yi , Du Chuang , Song Ti
Published: March 2013

In this paper, a composite pavement stress absorbing layer is researched. Through the creation of the finite element analysis model of the composite pavement, the paper analyzed the shear stress and influencing factors such as a different level of force, the contact between the different layer, shear stress conditions, the surface layer modulus and thickness, base thickness, soil base resilient modulus. At last, the optimum thickness of the composite pavement structure layers is put forward.
Investigations and Cause Analysis of Early Diseases in SMA Pavement
Authors: Cheng Ying Wei
Published: March 2013

Since the asphalt overlay of freeway in Hubei Province was opened, it appeared undue early diseases. The diseases mainly appeared in the surface layer. Through the disease investigation, construction data lookups and on-site samplings of SMA-13 surface layer, the three main reasons of early diseases are indicated. They are unclean raw materials, loose control of mixture proportion and unreasonable construction site management. This paper analyzed the generation mechanism of diseases in SMA pavement from every involved respect. At last, the suggestions about construction control measures were put forward to prevent early diseases．
Research on Solidified Mechanism of Compound Consolidated Soil
Authors: Xu Jun Chen , Liu Quan Zhong
Published: March 2013

By the scanning electron microscopy and experimental study, curing mechanism of the ZL-1 curing agent was studied in this paper, and the curing mechanism of the traditional curing materials in the soil clay was also analyzed. The study found that ZL-1 has a good curing effect on curing agent to the lime and clay mixture ，cement and clay mixture, and has greatly improved water stability, durability. And the best mix proportion was given.
Test on Cement Stabilized Blast Furnace Slag Material
Authors: Jiao Tao , Hu Li Chao , Zhou Jian Ping , Fu Jian
Published: March 2013

With low content in CaO, blast furnace slag is a unique local engineering material with characteristic of multi-hole structure and high strength. Based on requirement of highway base material, strength performance test and feasibility analysis is conducted in this paper. With different proportion of cement content, through comparison of test data between cement stabilized slag and traditional cement stabilized material, traditional gravel aggregate could be substituted completely by Pangang blast furnace slag in application of highway base.
Analysis of Seismic Performance of RC Frames with Centrally Reinforced Columns
Authors: Lei Zi Xue , Han Yu Hang , Dong San Sheng , Guo Jun Qing
Published: March 2013

A centrally reinforced column is a new type of RC columns, formed by providing a reinforcement skeleton at the central part of the cross section of an ordinary RC column. Tests have shown that as compared with an ordinary RC column, this type of columns has a higher load carrying capacity and ductility. From the pushover analysis of a frame composed of ordinary RC columns and one consisting of centrally reinforced columns, their seismic performance under seismic load of 9-degree intensity was studied according to Chinese code, including target displacements, story-level displacements, interstory drifts, appearance and development of plastic hinges. The results indicate that although the dimensions of cross sections of columns in the frame with centrally reinforced columns are smaller than those of the ordinary frame, the former still has a higher overall load carrying capacity and seismic performance than the latter.
Study on Non-Linear Numerical Method of Composite Foundation with Rigid-Flexible Piles
Authors: Yang Shao Chong , Zhang Jian Hui
Published: March 2013

A non-linear numerical method of composite foundation with rigid-flexible piles in the stratified soil under the vertical load was established in this paper. The analytical model of the pile-soil-pile interaction was used to imitate the pile-soil system and the finite element method was applied to simulate the cushion (the cushion cap). The corresponding calculation program was programmed. Computation results show that the method is reasonable and feasible, and can be applied to the analysis of practical composite foundation.
Ground Motion Distribution Analysis about Taipei-101 in Earthquake
Authors: Lu Zhao , Zuo Ren Yu , Ruan Xiang
Published: March 2013

It is important for tall building to infer seismic hazard analysis. Recently, researchers paid great efforts to study the seismic hazard analysis using the method of probabilistic seismic hazard analysis (PSHA), and PSHA has been proved to be sound and popular. The PSHA method is not new. However, the use of PSHA in China is not extensive. The purpose of this paper is to explore the use of ground motion distribution analysis about one typical tall building Taipei-101. Based on the earthquake catalog around Taiwan with more than 50,000 events over 100-years of recording, the author takes Taipei-101’s geographic coordination as object to do ground motion distribution analysis. The research shows that ground motion is affected significantly by service year, and the chi-square test applied in testing Annual ground motion distribution better than K-S test, In addition, Bernoulli distribution is verified reasonable in evaluating the entire service year ground motion distribution.
Response Spectrum Characteristics of Near-Fault Ground Motions and Influence to CFST Arch Bridge
Authors: Xing Fan , Kang Rui
Published: March 2013

Near-fault ground motions are more complex than the common far field, and it can significantly change the response characteristics of the structure. The records of Taiwan chi-chi earthquake associating with velocity pulse are selected, and the seismic accelerate response spectrum of different site are studied in deep. On the basis of time-history analysis, the seismic responses of a long-span CFST (concrete-filled steel tubular) arch bridge are discussed. Weakness section of the CFST arch rib are also indicated, providing a valuable reference for aseismic design.
Floating Roof Influence on Seismic Response of Large Vertical Storage Tank
Authors: Sun Ying , Sun Jian Gang , Cui Li Fu
Published: March 2013

To study the impact of floating roof on seismic response of vertical storage tank structure system subjected to seismic excitation, select 150000m3 storage tanks as research object, and the finite element analysis model of storage tanks with and without floating roof were established respectively. The seismic response of these two types of structure in different site conditions and seismic intensity were calculated and the numerical solutions were compared. The results show that floating roof has little impact on base shear and base moment in different site conditions and seismic intensity. Floating roof can effectively reduce the sloshing wave height. The influence of floating roof on dynamic fluid pressure decreases with the increase of seismic intensity, which is less affected by ground conditions.
Literature Review of Seismic Behavior of Composite Steel Plate Shear Wall
Authors: Zhou Ning , Xiong Feng , Huang Qun Yi , Ge Qi , Chen Jiang
Published: March 2013

Composite steel plate shear wall (CSPSW), as a new lateral force resisting structure composed of steel plate and concrete slab, is introduced. CSPSWs can fully display the superiority of the steel plate and concrete. Ductility and energy dissipation capacity of the walls are increased and seismic behavior is improved. Recent seismic research around the word of two kinds of CSPSWs, namely, CSPSW with signal steel plate and CSPSW with double steel plates, is presented and discussed comprehensively. Some existing problems in current research of the walls are also reviewed in this paper.
Test Research on the Long-Term Consolidation Mechanism of Ultra-Soft Clay
Authors: Liu Ai Min , Yan Shu Wang , Li Jing Shuang
Published: March 2013

Although the settlement of ultra-soft clay improved by the vacuum preloading technique was large in land reclamation projects, usually exceeding the theoretical calculation value by a large amount, the strength increase was relatively small. As a result the foundation would not meet the design requirements for strength. So a test was conducted to investigate the effect and mechanism of long-term consolidation of ultra-soft clay in laboratory in a period of over 691 days. A preloading load of 80kPa was used in this drainage consolidation test. The test result showed that for the ultra-soft clay with a high initial water content but a small strength, the settlement is large with a large strength increase, but the shear strength was relatively low. These results should draw much attention in application of vacuum preloading technique in construction projects.
Study on the Seismic Performance of Block Masonry
Authors: Sun Lei , Cui Zhao Yan , Liu Fu Sheng , Wang Shao Jie
Published: March 2013

For the time being there are few literatures about study on the seismic performance of concrete hollow block masonry based on the finite element method, left fewer conclusions for reference. According to characteristics of the finite element software, which has strong capability of nonlinear analysis, some key problems are discussed, including the modeling of the concrete hollow block masonry structure, constitutive relations of the materials in block masonry, damage assessment, solution methods, the application of the dead and live loads and the earthquake wave and the seismic performance analysis. The time-history analysis is carried out on three different type walls with openings. Some key factors, such as core columns and ring beams, which have a great influence on the damage pattern and stability of the structure, are discussed. The conclusion from the paper can provide a beneficial reference for in-depth study of the seismic performance of concrete hollow block masonry and the damage patterns.
The Seismic Research of Connection with Haunch Frame
Authors: Jiang Li Yun , Sun Xu Dong
Published: March 2013

In some accidents of earthquake, the steel frame was brittle damaged. The problem lied in the hinge part of the structure—beam-to-column connection. This made some academicians point out connection with haunch. In this article, the modal analysis and harmonic response analysis of frame are made at the basis of connection with haunch by using ANSYS. Through the model analysis, the natural frequency and relative vibration modes of the structure are gotten, which can help us prevent the frame from resonance, the harmonic response analysis is made based on the model analysis, the curve between the frequency and the deformation of each layer is drawn, from which we can also know the peak. The method used in the article can provide a train of thought about how to deal with complexly giant steel structure, and also lay the foundation for further research.
Study on Seismic Behavior of Evacuated Square Pyramid Space Grids in a Project
Authors: Wang Sheng Nan , Wang Lai
Published: March 2013

With an actual project example, a parametric model of the evacuated square pyramid space grid was established. The natural vibration characteristics and seismic response analyses were carried out by ANSYS, and the results were compared with the square pyramid space grid. The distributions of dynamic internal force of bar members were summarized under vertical earthquake action and horizontal earthquake action. The research shows that evacuated square pyramid space grids is a reasonable structural style for the large-span roofs due to good mechanical properties and low steel consumption. The results provide an important guiding significance for engineering design and development of this structure.
Study on Seismic Behavior of Transformed-Connection Joint in Light Steel Adding Storey
Authors: Guo Rong , Du Chuang , Yin Cheng Lin
Published: March 2013

Based on the pseudo-static tests among three different types of joints (traditional planted-bar joint, the CFRP strengthening joint and the transformed-connection joint) between concrete frame and adding light steel storey, the research was carried out to contrast the seismic performance of these joints. The results showed that: three joints’ destruction was due to the plastic hinge and the maximum crack appearing at the end of beams, the seismic performance of the two new types of joints were better than the traditional planted-bar joint; Among the three joints, the hysteresis curve envelope area of CFRP strengthening joint was the biggest and the energy consumption was the most powerful; The stiffness of transformed-connection joint was improved significant, and its manufacture technology of joint was simple and convenient.
The Analysis of Influencing Factors for Seismic Performance of Load-Bearing Wall Using Light Artificial Block
Authors: Yu Jing Hai , Wang Yan , Fei Tian Hui
Published: March 2013

This article analyzed the influencing factors for earthquake resistance performance of load-bearing wall through the establishment of finite element model and the reasonable load way. The factors of vertical stress, masonry strength, and horizontal reinforcement strip were analyzed, and relevant conclusions were drawn. The results indicate that the masonry strength is the main factors affecting shear performance of the wall and the horizontal reinforcement strip enhance the seismic behavior of the wall.
Vibration Energy Dissipation Analysis of a Shear Wall Structure
Authors: Zheng Jie , Li Ai Qun
Published: March 2013

This paper studied on vibration energy dissipation analysis of a shear wall structure with viscous liquid dampers for reinforcement and reconstruction. Viscous liquid dampers and herringbone steel shotcrete were used for seismic control and the elastic-plastic time history analysis had been carried out. The results show that: the first layer shear force decreases. The minimal average damping rate of layer displacement in X direction is 4.68% and the maximum is 12.92%; the minimal average damping rate of layer displacement in Y direction is 6.47% and the maximum is 19.8%. So using viscous fluid dampers , the vibration response of the structure could be effectively reduced．
Numerical Simulation of Buried Structure Response to Strong Dynamic Load
Authors: Nian Xin Zhe , Zhang Yao
Published: March 2013

Three kinds of numerical methods (Lagrange, ALE, SPH-FEM) were used to analyze the response of an fully buried underground structure under blast loading, the differences of these three methods and factors which affect calculation accuracy were analyzed and compared. The results show that the Lagrange method can give more accurate results, but it should be taken into account that the shape of the ammunition may influence the calculation of impact stress in soil.
Studying on Deduction of Unit Weight Mean Square Error of No-Equal Precision Independent Surveying Values about Literatures[1-2]
Authors: Deng Yong He
Published: March 2013

This paper further points out mistakes about testfying unit weight mean square error of no-equal precision independent surveying values in literatures[1-2],and further supports literature[3].So,this paper has some positive meaning.
Correct Indirect Discrete-Continual Boundary Element Method of Structural Analysis
Authors: Akimov Pavel A.
Published: March 2013

This paper is devoted to so-called indirect discrete-continual boundary element method of structural analysis. Operational formulation of the problem is given. Using fundamental operational relations of indirect approach after construction of corresponding fundamental matrix-function in a special form convenient for problems of structural mechanics and its application resolving set of differential equations with operational coefficients is obtained. The discrete-continual design model for structures with constant physical and geometrical parameters in one direction is offered on the basis of so-called discrete-continual boundary elements. Basic pseudodifferential operators are approximated discretely by Fourier series. Fourier transformations and Wavelet analysis can be applied as well.
Some Properties for a System with Dense Orbits
Authors: Lu Tian Xiu , Zhu Pei Yong
Published: March 2013

The point orbits under continuous self-maps on completely densely ordered linear ordered topological spaces (CDOLOTSs) are discussed. First, we point that the density of orbits implies the topological transitivity of the continuous self-map. Then, we give the necessary conditions for the density of the orbit under the even iterations. Such conditions are established on the fact that x(x is in L, L is a closed interval on a CDOLOTS) has a dense orbit under the continuous self-map.
The Static Test Study on Anchors of CFRP Cables
Authors: Mei Kui Hua , Lv Zhi Tao , Zhang Ji Wen
Published: March 2013

The axial performance of CFRP is excellent, while the lateral compression strength and shear strength are low, thus they can’t be anchored by traditional anchors. A new type of adhesive anchor was designed and five experimental cables were fabricated and the static tests were carried out. In the tests, the tensile capacity, bond strength and pullout behavior of CFRP cables anchors filled with resin were discussed. The efficiency coefficients and the load-slip behaviors of the bond-type anchors and the uniformities of the stresses in the tendons were studied. Several conclusions are drawn which have become powerful evidences for using the bond-type anchors in the first cable stayed bridge with CFRP cables in China.
Application of Special Sensor for Deformation Modulus Test of Plastic Concrete
Authors: Guo En Cong , Wang Shi Yue , Ren Zhao Ying
Published: March 2013

A displacement sensor was designed and made for the deformation modulus test of plastic concrete according to the method of full gauge measurement. Such parameters as sensitivity, linearity and repeatability, etc. were obtained after the calibration of the sensor. The results show that the indicators have met the requirements on the class-1 precision. The results from the practical application of engineering test indicate that the designed displacement sensor which is easy to use and high in the degree of precision can meet the needs of practical application of engineering.
Research on the Thermal Insulation Performance and Energy Saving of Fabricated Straw Brick
Authors: Huang Zhen , Chen Wei , Huang Dong Sheng
Published: March 2013

Fabricated straw brick is a new wall material, its character is a kind of sandwich structure with tenon and groove, and wall assembly does not require any additional connections. Experiment and calculation have done to study the thermal parameters of fabricated straw brick and environmental protection performance of building in this material. The results show that straw wall’s heat transfer coefficient is much lower than that of normal concrete block and lightweight aggregate concrete block, which can guarantee good insulation performance. It was proved to have good thermal insulation in the further computational analysis. Therefore, it is a kind of environmental protection building material.
Swelling Behaviour of GMZ Bentonite
Authors: Sun De An , Lv Hai Bo , Wei Chang Fu
Published: March 2013

Gaomiaozi (GMZ) bentonite has been chosen as a matrix material of buffer/backfill materials in the deep geological disposal to isolate the high level radioactive waste in China. Swelling characteristics of GMZ bentonite and its mixtures with sand wetted with water were studied by experimental methods. The tests result shows that the relation between void ratio and the swelling pressure of compacted GMZ bentonite-sand mixtures at full saturation is independent on the initial conditions such as initial dry density and water content, and dependent on the ratio of bentonite to sand. An empirical equation is proposed to predict the swelling deformation and pressure of the mixtures with different densities and bentonite/sand ratios.
Analysis of Thermal Performance of a New Regenerated Glass Pumice External Wall Insulation System in Hot Summer and Cold Winter Zone
Authors: Gu Qian , Ren Sheng , Wang Yue , Luo Hao
Published: March 2013

The thermal performance of a new regenerated glass pumice board as external wall thermal insulation material was analyzed in this paper. Considering the roles of solar radiation and air convection, and selecting Wuhan city as an example of the hot summer and cold winter zones, the temperature field distributions of the external building walls in different orientations in summer and winter seasons were numerically simulated by using the finite element software ANSYS. The thermal performance of regenerated glass pumice exterior wall external insulation system including the heat transfer coefficient and the temperature distribution was evaluated. The simulation results demonstrate the good thermal insulation performance of the regenerated glass pumice as a new kind of external wall materials, and the feasibility of the application of this environmentally friendly material to the wall insulation system in energy conservation building is also promoted.
Experimental Study and Life Cycle Assessment of High Volume Fly Ash Concrete
Authors: He Shi Qin , Li He , Zhu Zhong Feng , Li Peng Fei
Published: March 2013

One of the effective ways of low carbon concrete is to reduce the cement content. It can not only reduce the greenhouse gas emission, but also improve the comprehensive utilization of industrial solid waste. In this paper, the mix design and experimental research of C15 Self-Compacting Concrete (SCC) were carried out by substituting cement with high volume fly ash. A partition coefficient of environmental burden Cm was introduced in order to assess the environmental effect of different mix proportion SCC precisely by using life cycle assessment method. Evaluation results showed that the mixing of fly ash can reduce the consumption of coal, the discharge of CO2 and the solid wastes effectively. The study provided a rational basis for the high performance and low cost fly ash concrete.
Application Study on the Stability of Xiufengsi Landslide by Using Limit Equilibrium Method and Finite Element Method
Authors: Wang Qing , Yao Lei Hua , Zhang Ning
Published: March 2013

Xiufengsi Landslide is an ancient landslide in Wushan County, Chongqing, China. Under natural condition, this landslide is stable. Due to the Three Gorges Reservoir, however, the water level in this region fluctuates within the range of [145 m, 175 m], periodically. Furthermore, an increasing number of residential quarters have been built on this landslide that also increase the possibility of occurrences of the landslide. Motivated by the government’s desire to take measures in control the landslide, we use two approaches to study the stability of this landslide. Under different computational conditions, the safety factors of the landslide are calculated by using limit equilibrium method and finite element method, respectively. Based on the comparison of the results, the stability of the landslide is analyzed more objectively and comprehensively. This work also lends insight into the landslide forecast.
Experimental Study on Mechanics Performance of Complex High Titanium Heavy Slag Concrete
Authors: Sun Jin Kun , Huang Shuang Hua , Chen Wei , Li Bing , Liu Jing
Published: March 2013

In view of the present situation that the preparation of complex high titanium heavy slag concrete (hereinafter referred to as CHTHSC) by using all coarse aggregate, fine aggregate and ground admixture made of high titanium heavy slag, is in need of experiments and studies in detail, this paper, based on the verification and analysis of structural stability of complex high titanium heavy slag and through tests of preparing CHTHSC from C10 to C55, compares CHTHSC with ordinary concrete and high titanium heavy slag concrete (hereinafter referred to as HTHSC) from three aspects of mixture amount of coarse aggregate, fine aggregate and composite powder. Results show that the compression resistance, axial compression resistance and cleavage strength of CHTHSC are higher than those of the other two kinds of concrete. For CHTHSC, it is appropriate to have composite powder take the place of 15%-20% of cement content.
Exploration about New Green Building Materials - The New Decorative Materials of Water Printing Ecological Wood
Authors: Li Song , Sun Xiu Fang , Mao Jin Xi
Published: March 2013

In recent years, with the modernization of the home facilities and the rise of the renovation boom,the decorative materials which are numerous in variety and different in function also get more and more chemicalizing .As a result, the bedroom air pollution can not avoid gaining increasing atten- tion to it and greater emphasis on the problem. As non-toxic, odorless and pollution-free products,the new materials of water printing ecological wood researched and developed by Liaoning Rentian Sci- ence&Technology Co.,Ltd are environmental,healthy and safe,which not only greatly reduce the con- sumers’decorating costs, but also solve the problems of the decoration materials containing formald- ehyde and the properties of durability as well as waterproof performance.Undoubtedly,they become the most popular eco-friendly decorative materials with broad market prospects.
Influence of Adding Lime Dust on Compressive Strength and Frost Resistance of Fly Ash Recycled Concrete
Authors: Wu Xiang Hao , Yao Yong Xin , Yin Xing Wei , Yuan Pan
Published: March 2013

The influence of part of fly ash replaced with lime dust on fly ash recycle concrete compressive strength and frost resistance is investigated by compression tests and rapid frost-thawing test. The experimental results show that part of fly ash replaced with lime dust will reduce the early compressive strength of the fly ash recycled concrete; the right amount of lime dust replacing fly ash can raise the latter compressive strength of fly ash recycled concrete, the best replacement proportion is 10%. The anti-frozen capacity of fly ash recycled concrete will reduce by replacing part of fly ash with lime dust, and the amplitude reduction of anti-frozen capacity of fly ash recycled concrete in seawater is greater than the amplitude reduction in sulfate solution and in freshwater.
Polypropylene-Based Biocomposites Reinforced by Tailor-Modified Cellulose Fibers and Microfibrils
Authors: Pan Yuan Feng , Li Shu Zhao , Xiao Hui Ning
Published: March 2013

Two approaches of improving the toughness of polypropylene (PP)-based composites reinforced by natural cellulose fibers were developed. The surface modification of cellulose fibrils (CMF) or fiber by either in-situ grafting polymerization of butyl acrylate (BA) on CMF surface via an atom transfer radical polymerization (ATRP) or adsorbing the cationic polymeric latex with core-shell structure on fiber surfaces was performed; and resulting fibers or CMF were used as reinforments in an attempt to enhance the toughness of the PP-based composites. The results of mechanical properties indicated that the flexure, tensile, and impact strengths of the CMF-g-PBA reinforced composites were all improved. The cellulose fibres treated by cationic latex also showed the same trend. The optimal dosage of latex for hydrophobic-modifying fibers was also identified.