bluuebunny/crossref_metadata_2025 huggingface dataset:
Induction of Nitric Oxide Synthesis of a Lactobacillus acidophilus Strain in Human HepG2 Cells
Authors: Chen Kun , Li Jun Xun , Luo Xue Gang , Liao Xing Hua , Gao Jie , Hu Xia Min , Wang Nan , Zhang Tong Cun
Published: October 2011

Based on observations that lactic acid bacteria has proved to be beneﬁcial in the treatment of viral-and antibiotic-associated diarrhea but the mechanisms of action remain unknown. Some reports indicated that nitric oxide (NO) might be involved in the protective mechanisms in the gastrointestinal tract and may contribute to some of the beneﬁcial effects of probiotics. To confirm the effect of a probioticLactobacillus acidophilus(L. acidophilus) strain TCCC 11036 on the NO synthesis, in the present study, HepG2 human liver cells were cultured and treated with the supernatant or precipitate ofL. acidophilusTCCC 11036 cell hydrolysates, then NO synthesis and its regulation were measured with the methods of NO assay, luciferase reporter assay and RT-PCR. The results showed that the production of nitric oxide was increased after treated with precipitates of the bacterium, and its transcription was enhanced as well. These works might provide a foundation for the following study ofL. acidophilusand its probiotics functions, and contribute to the development of functional foods or drugs that provide health benefits to patients suffering from inflammation, cardiovascular disease, or some other diseases correlated with NO.
Preparation of Mesoporous Bioglass Coated Zirconia Scaffold for Bone Tissue Engineering
Authors: Lin Feng , Yan Cheng , Zheng Wei , Fan Wei , Adam Clayton , Oloyede Adekunle
Published: October 2011

Porous yttria-stabilized zirconia (YSZ) has been regarded as a potential candidate for bone substitute due to its high mechanical strength. However, porous YSZ is biologically inert to bone tissue. It is therefore necessary to introduce bioactive coatings onto the walls of the porous structures to enhance its bioactivity. In this study, porous YSZ scaffolds were prepared using a replication technique and then coated with mesoporous bioglass due to its excellent bioactivity. The microstructures were examined using scanning electron microscopy and the mechanical strength was evaluated via compression test. The biocompatibility and bioactivity were also evaluated using bone marrow stromal cell (BMSC) proliferation test and simulated body fluid test.
Boron Trifluoride Etherate - A Mild and Inexpensive Reagent for Synthesis of Coumarin Derivatives under Solvent-Free Conditions
Authors: Sun Gao Jun , Wang Zhi Yong , Chen Man Hua
Published: October 2011

Coumarins are important structural units of many natural product, and feature widely in pharmacologically and biologically active compounds. Now, a mild and convenient synthesis of coumarins catalyzed by boron trifluoride etherate is reported in this study with up to 98% isolated yield.
Isolation of Bacillus megaterium MPF-906 and its Fermentation Characterization of Reducing Nitrite
Authors: Zhang Ying , Liu Ping , Ma Peng Fei , Sun Jun She
Published: October 2011

Nitrites are highly harmful compounds. They are extremely undesirable in surface and municipal water. The permissible content in natural water is very low and should not exceed 0.01 mg of NO2-/dm3. In this paper a Bacillus isolated from the waste tobacco trimmings was able to reduce above 99.8% of NaNO2 under aerobic conditions. Based on the morphology, physiological tests, the 16S rRNA gene sequence and the phylogenetic characteristics, the strain was identified as Bacillus megaterium. The bacteria grew optimally at 30 °C, initial pH 7.0 and 138 g/l of nitrite concentration. After incubated aerobically under agitation 160 rpm for 24 h, 99.8% of NaNO2 was reduced by B. megaterium MPF-906, this showed a promising biology method for the reduction of nitrites in aqueous solution.
Microbial Carbonate Mineralization as an Improvement Method for Durability of Concrete Structures
Authors: Li Pei Hao , Qu Wen Jun
Published: October 2011

Biodeposition treatment had been proposed as alternative techniques for improvement in the durability of concrete structures. Laboratory experiments were conducted by bacterially mediated carbonate precipitation on the surface and subsurface of specimens of concrete. Some properties of specimens and crystal, such as the crystal phase, morphology and growth of the crystal deposited on specimens, water penetration, the resistance towards carbonation of concrete and so on, were analyzed by XRD, SEM, water absorptivity test and concrete accelerated carbonation test. Some efficiencies of biodeposition treatment for were investigated by experiment. Results show that the mineral crystal deposits uniformly on the surface and subsurface of specimens, phases of crystal are calcite and vaterite. Biodeposition effectively reduces capillary water uptake and leading to carbonation rate constant decreased by 25~40%. Bacterially mediated carbonate mineralization can be an ecological and novel alternative for improvement in the durability of concrete structures.
Investigation of Indigenous Microbial Enhanced Oil Recovery in a Middle Salinity Petroleum Reservoir
Authors: She Yue Hui , Shu Fu Chang , Wang Zheng Liang , Yu Long Jiang
Published: October 2011

Culture-based techniques were applied to analyze the diversity of indigenous microbial communities in the Qinghai middle salinity petroleum reservoir (QH-MSPR). The results of the most probable number (MPN) method indicated there was an abundance of indigenous microbes (105-106MPN/ml). Two isolations (BIOS682) from the QH-MSPR were identified as Brevibacillus agri and Brevibacillus levickii. The study showed that BIOS682 enhanced the degradation rate of Huatugou crude oil. The viscosity and freezing point of crude oil after treatment by BIOS682 were all decreased. The results of TLC and FTIR spectrum analysis of the biosurfactant produced by BIOS682 indicated that it was identical to that of lipopeptide. The core-flooding tests showed that the incremental oil recoveries were 7.05-10.15%. Thus, BIOS682 may provide a viable application of microbial enhanced oil recovery (MEOR).
Properties of Arabinoxylans from Wheat Bran, Shorts and Flour
Authors: Zheng Xue Ling , Li Li Min , Wang Qi
Published: October 2011

Arabinoxylans were prepared from bran, shorts and flour, three wheat milling fractions. The yields of bran arabinoxylan (WBAX), shorts arabinoxylan ( WSAX) and flour arabinoxylan ( WFAX) were 8.99%, 7.28% and 1.12% respectively. Sugar composition analysis showed that WFAX contained less non-cellulosic sugars ( 75.56%) compared with WFAX and WSAX. WBAX had the lowest Ara/Xyl ratio compared with WSAX and WFAX. HPSEC analysis showed that WFAX had higher molecular weight compared with WBAX and WSAX, and WBAX had the lowest molecular weight. WBAX, WSAX and WFAX in water solution had higher molecular weight than in 0.5mol/L NaOH and 1.0mol/L NaOH. In 1.0 mol/L NaOH solution, arabinoxylans had the lowest molecular weight compared that in 0.5 mol/L NaOH and distilled water. From the recovery of WBAX, WSAX and WFAX in different solvents, it showed that 1.0N NaOH had good dissolved effect for arabinoxylans, and water heating treatment ( 80°C 2hr, then stirring overnight at room temperature) had poor dissolved properties compared with 0.5 mol/L NaOH and 1.0 mol/L NaOH ( 25°C,2hr)
Extracts of Paris Polyphylla Smith Mitigates Oxidative Stress in Human Umbilical Vein Endothelial Cells Induced by Oxidized Low Density Lipoprotein
Authors: Gao Lin Lin , Li Fu Rong , Si Yan Hong , Qin Shu Cun
Published: October 2011

Paris Polyphylla Smith is widely used in traditional Chinese medicine. For its effective of antipyretic detoxicate, its active component is steroid saponin[1]. The present study was designed to evaluate the antioxidative effect of extracts of Paris Polyphylla Smith (PPSE) and its capacity to protect human umbilical vein endothelial cells (HUVECs) against oxidative damage induced by oxidized low density lipoprotein (ox-LDL). Cytotoxicity was determined by MTT assay. Flow cytometer (FCM) demonstrated that the increased apoptosis induced by oxidized low density were inhibited, and the blocked transition of cells from static phase (G0/G1) to DNA synthesis (S) were restored by PPSE, these effect were all in a dose-dependent manner. The actions by PPSE to reduce apoptosis may help protect endothelial function and inhibit atherogenesis, while the novel actions to mitigates oxidative stress may weaken the ability of endothelial injury. Further studies are needed to identify the chemical compounds responsible in order to develop its clinical application.
Impact of Hemicellulose on Cellulose Simultaneous Saccharification and Fermentation
Authors: Zhou Xiao Hong , Chen H. , Li Z.
Published: October 2011

Hemicellulose is generally considered a negative factor for enzymatic cellulose hydrolysis, but it was proved to be a positive one for the enzymatic action of delignified pulp in this study. Alkaline wheat straw pulp (AWSP) with different hemicellulose proportion was obtained by treating AWSP with 1 M H2SO4 at 100°C for different time. The soluble fractions of the hydrolyzed mixtures neutralized with Ca (OH)2 together with the insoluble fractions were used for simultaneous saccharification and fermentation (SSF). The ethanol yields reduced while the hemicellulose content of AWSP decreased. The crystallinity increasing after hemicelluloses removal suggested that amorphous hemicellulose interweaving with cellulose prevented cellulose fibers to aggregate compactly and improved the access of cellulases to cellulose. However, the yeast unfermented reducing sugar derived from hemicellulose was inhibitory to SSF.
The Meshless Reproducing Kernel Particle Method for Two-Dimensional Linear Hyperbolic Equations
Authors: Sun Hai Na , Cheng Rong Jun
Published: October 2011

The meshless reproducing kernel particle method (RKPM) is used to find the numerical solution of a kind of hyperbolic equations. A variational method is used to obtain the discrete equations and the essential boundary conditions are enforced by the penalty method. The effectiveness RKPM for two-dimensional hyperbolic problems is investigated by numerical example in this paper.
Despeckling Algorithm of SAR Image Based on EMD and PCA
Authors: Wang Wen Bo , Wang Mei Ge
Published: October 2011

This paper proposes a new despeckling algorithm of SAR image based on EMD and PCA. Firstly, it approximately evaluates the noise energy in all levels of IMF according to the energy distribution model of Gaussian white noise decomposed by EMD. And then it uses PCA to decompose IMF. According to the decomposition feature of the noisy signal and the proportion of noise energy in IMF, select proper principal components to reconstruct IMF so as to further remove the IMF noise. Finally, the simulation results show that the new method can effectively delete noise, and better keep the texture details of the edges.
Novel Plasticity Integration Algorithm in Improved Inverse Analysis Method and its Verification in Clover-Shaped Cup Drawing
Authors: Lu Xiao Yang , Lu Xiao Li , Tang Bing Tao , Huang Li Li
Published: October 2011

An improved inverse analysis method is developed based on the final workpiece in Euler coordinate system. The drawbeads and the radius of the die introduce a complex bending-unbending loading history as the material passes through these regions. Unlike the widespread inverse analysis using deformation theory of plasticity, in order to consider loading history, the improved inverse analysis method uses the constitutive equation based on flow theory of plasticity. In order to avoid numerous iterations to ensure the numerical stability in Newton-Raphson scheme to obtain plastic multiplier , a novel plastic integration algorithm is proposed to consider bending–unbending effects. A clover-shaped cup drawing example is numerically simulated with the inverse analysis method based on deformation theory of plasticity and the improved one based on flow theory of plasticity. These simulated results are compared with those of the incremental forward finite element solver LS-DYNA simultaneously. The comparisons of blank configurations and the effective strain distribution show that the proposed plasticity integration algorithm is effective and reliable.
Synthesis, IR Spectra and Fluorescent Property of Eu (III) Complexes with Multifunctional Ligands
Authors: Wang Li Hua
Published: October 2011

Two new Eu (III) complexes with multifunctional ligands, 2, 2'-dithiosalicylic acid (L1) and 1-acetyl-2-naphthol-4, 4'-diaminodiphenyl ether (L2) have been prepared in ethanol solution. The complexes are stable in air. The infrared spectrum and luminescent spectra of Eu (III) complexes were studied. The results indicate that the oxygen atoms of the ligands (L1 and L2), the nitrogen atoms of L2, the oxygen atoms of the nitrate and coordinated water molecules coordinate to Eu (III) ions. The luminescent property of Eu (III) complexes have been investigated in solid state.
Generation of Respiratory Flow Having Fractal Signal Feature
Authors: He Zhong Hai , Du Yi Hao , Wu Zhao Xia
Published: October 2011

In this paper how to generate respiratory flow that has fractal signal feature is introduced. Physiological signal have fractal feature have been verified by many researchers, such as heart beat rate, interbreath interval. Mechanical ventilators are used to provide life support for patients with respiratory failure. But these machines can damage the lung, causing them to collapse. On the other hand, fractal feature can be used as an indication of health situation; as a result in patient simulation the physiological signal should also have fractal features. The fractal feature is generated by fractional Brownian motion simulation. The fractal dimension is decided by Hurst exponent in routine. The algorithm is realized by R language and result is input into LabVIEW which have friendly interface and easy for simulation control usage. The method can be used in design of mechanical ventilator and medical patient simulator.
Damage Evolution of Rock and Acoustic Emission Study about Deep Diversion Tunnel in the Excavation Process
Authors: Kang Zhi Qiang , Yu Yang , Wen Hai Min
Published: October 2011

In order to reveal the scale, location and damage mechanism of depth underground tunnel this was excavated. Experimental study in the project scenes where more than 2500 meters underground, makes use of the acoustic emission technology, and monitor the whole process of the Jin ping 2# experiment hole excavated, researches combining the acoustic emission and the surrounding rock damage evolution process. The results indicate that: The acoustic emission event and the energy parameter can reflect rock internal stress field change, according to above can determine the stable degree of rock mass; The emergence, development of rock burst and unstable rock produce mostly occurred in the place where surrounding rock stress was smaller or have been discharged when great depth underground tunnel was excavated, and its direction was along the direction of roadway excavation, from the part where rock stress was smaller develop to tunnel in wall; And main damage or cracking is developed in 7m range: 3m locations the most severe after free face. Relaxation and damage range of surrounding rock are 2m, 2~5m, and 5~12 m far from tunnel wall, Rock mass abscission is caused by the increasing of rock damage vibration amplitude, and the rock mass falls off is also an energy release’s process.
Investigation on the Aging Properties of Silicone Coating in Marine Concrete
Authors: Xu Xing Xin , Sun Chang Jun , Chen Xing , Qin Liang , Yu Jian Ying
Published: October 2011

This paper reports result of a study conducted to evaluate the aging properties of isobutyl triethoxysilane coating used in marine concrete. The silicone coating was brushed to the surface of mortar specimens and the aging properties of the silicone coating were investigated by thermal aging and ultraviolet (UV) aging. The water absorption of the mortar specimens applied with the silicone coating increases with the extension of the aging time. And the higher aging temperature, the bigger the water absorption. Because of the combined effect of light and heat, water absorption of specimens after UV aging at 60 °C is larger than that after thermal aging in the same temperature. In addition, noticeable variation in aging properties of the same silicone coating by different manufacturers is noted.
Preparation of Microwave Organic Modified Montmorillonites and Decolorization on Dye Wastewater of Acid Fuchsin
Authors: Li Na , Liu Hai Biao , Zhou Xiu Yan , Wang Yu Heng , Zheng Xiao Yan
Published: October 2011

The main difficult problem was decolorization in the treatment of dye wastewater. Organic modified montmorillonite could be a good adsorbent to settle this problem. An organic modified montmorillonite was prepared using microwave irradiation method instead of common water bath heating method, and the decolorization on dye watewater of acid fuchsin was reasearched. Its decolorization on acid fuchsin solution was better obviously than that of montmorillonite. And the decolorization rate was increase with the increase of the initial concentration of acid fuchsin. When the concentration of acid fuchsin solution was 40 mg/L, the optimum decolorization condition was 0.1 g of adsorbent quantity, 6.1 of pH, 30 min of contact time, and 25 °C of operation temperature.
Effect of Ce Addition on the Microstructure and Properties of Cu-10Fe-3Ag In Situ Composite
Authors: Li Yong , Liu Rui Qing , Xu Fang
Published: October 2011

Cu-10Fe-3Ag in situ composites containing (0–0.30%) Ce elements were prepared by cold drawing and intermediate heat treatments. Microstructure was observed, and mechanical properties and electrical conductivity were measured for alloys at various drawing strain ratio. Adding Ce element could reduce the size of primary Fe and Cu dendrites of Cu-10Fe-3Ag. Ultimate tensile strength increased but electrical conductivity decreased with the increase of drawing strain. Ce additions in Cu-10Fe-3Ag slightly increased the strength at low strain and effectively improved the conductivity at high strain. Both strain hardening rate and conductivity loss of Cu-10Fe-3Ag containing Ce were reduced at lower strain than Cu-10Fe-3Ag.
Research on the Structure of One-Dimensional Chain Calcium (ΙΙ) Complex Material
Authors: Wang Li Hua
Published: October 2011

A new Ca(II) complex material has been prepared by the reaction of calcium perchlorate with 4-amino-3-methyl-benzenesulfonic acid and sodium hydroxide, and was characterized by single-crystal X-ray diffraction. The results showed that the complex crystallizes in monoclinic, space group P2(1)/n with a = 0.63090(10) nm, b = 0. 70513(11) nm, c = 2.4262(4) nm, V = 1.0766(3) nm3, Z = 2, F (000) = 562, Rint = 0.0252. Single-crystal X-ray diffraction analysis revealed that each calcium ion lies in six-coordinated environments, and the complex formed one dimensional chain structure through intramolecule and intermolecule hydrogen bonds and π-π stacking interaction.
Particles Gradation Optimization of Blasting Rockfill Based on Fractal Theory
Authors: Zhu Sheng , Feng Yan Ming , Feng Shu Rong , Chen Wu Yi
Published: October 2011

Based on fractal theory, used the index of rockfill compaction characteristics(granularity fractal dimension) which conforms to Talbot curve distribution, combined with blasting schemes and rolling test data of several domestic rockfill dams, the relationship is established between compacted rockfill’s dry density and rock blasting parameters by rockfill granularity fractal dimension and its average diameter, and that provided the basis for rockfill particle grading optimization method. The method is applied by rockfill of JIANGPINGHE dam under construction, and the results show that this method can well reflect the intrinsic relation between rock blasting and rockfill compaction, which can be applied to particle grading design of rockfill dam.
A Study on Distributive Regularities of the Fluid Pressure in Elbow Pipes
Authors: Lu Xiao Yang , Lu Xiao Li , Huang Li Li
Published: October 2011

This paper is a study on the distributive regularities of dimensionless pressure in elbow pipes by dimensional and qualitative analyzing methods. The qualitative description method of fluid flow such as 90° elbow pipe is obtained. With Computational Fluid Dynamics (CFD), the effect of a number of dimensionless parameters such as the non-dimensional curvature, Reynolds number, dimensionless axial angle α and annular angle β and other factors on the spatial distribution of pressure inside the elbow are analyzed and discussed in detail. This paper not only provides theoretical and numerical methods for understanding the dynamic behavior of the fluid in the elbow pipes, but also provides the reliable basis for designing thickness of elbow pipes with high temperature, high pressure and high velocity.
Fuzzy Control on Large-Span Spatial Structure Dynamical Response
Authors: Zhao Xiang , Wang She Liang , Zhao Xi Cheng , Dai Jian Bo
Published: October 2011

Focused on the dynamical collapse of large-span spatial structure, this paper uses giant magnetostrictive material to design a kind of new GMM actuator, which could be used in active vibration control of large-span spatial structure. The genetic algorithm has been used to optimize the position of actuators in large-span spatial structure and the structure of fuzzy control system is introduced. A standard fuzzy logic controller is designed. Fuzzy control routine established by the matlab software is used to carry on the active control simulation analysis on the long-span spatial structures. The research shows that the GMM actuator has fine actuating effectiveness, and can improve the computational efficiency of optimization design at the same time. The genetic algorithm also achieves the overall optimization of the structure and the effect to the fuzzy control is obvious.
Research on Debonding Formula Model of RC Beams Strengthened with CFRP Sheets
Authors: Bao An Hong , Qiu Zhen Yu , Wang Peng
Published: October 2011

Debonding of concrete occurs when the interface principal stress reaches the ultimate tensile strength. We propose the use of carbon fiber plate attached to the beam bottom, which makes finite element analysis of the mechanical properties of debonding concrete beams more reasonable. In addition, formulas of this theory are given and applied in the finite element analysis. Finally, it is shown by a number of experimental results.
Finite Element Analysis of Reinforced Concrete Beams with Transversely Prestressed Bars
Authors: Liu Can , Wu Bo , Xu Kai Yan
Published: October 2011

This paper presents a method that using inner transverse prestressing bars to enhance the shear capacity of concrete beams, which can be used in new transformer beams to decrease the sectional dimensions. Four transversely prestressed concrete beams and one ordinary reinforced concrete beam were tested. The nonlinear finite element method was applied to analyze them, and the following conclusions can be drawn: (a) The transverse prestressing bars can efficiently increase the shear capacity and failure load of the reinforced concrete beam, the improvement effect is more obvious when exerting the prestressing force on them properly. (b) On the whole, the simulated load-deflection relationships and failure loads of the five specimens agree well with the corresponding tested load-deflection relationships and failure loads. It indicated that the FE models used in this paper predict the structural behavior of the transversely prestressed concrete beams satisfactorily. (c) From the contour of first principal stress, it can be seen that the transverse prestressing bars can efficiently enhance the shear crack resistance of the reinforced concrete beams, if the area of transversely prestressing bars is almost same, the transverse bars with smaller diameter and smaller spacing will be better. It agrees well with the test results.
Study on Displacement Ductility Coefficient of Steel Reinforced High-Strength Concrete Column
Authors: Zheng Shan Suo , Lou Huan Juan , Wang Xiao Fei , Li Zhi Qiang
Published: October 2011

In order to study the displacement ductility coefficient of steel reinforced high-strength concrete column, 23 groups of components with various design parameters were tested and related factors that affect the displacement ductility coefficient of SRHSC column were presented in this paper. The proposed formula for calculating the displacement ductility coefficient of SRHSC column can be obtained from the multivariate nonlinear regression of test results by using SPSS. The calculation results agree well with the test conclusions, and it shown that the proposed formulas own high accurateness and can be objectively reflect the mechanical behavior of SRHSC column root. The research achievements will provide a theoretical support for the design of SRHSC column.
Research of Impact Compaction Technology on Foundation and Subgrade in Yellow River Flooded Area
Authors: Zhang Kai , Yao Zhan Yong , Shang Qing Sen , Song Xiu Guang
Published: October 2011

To study the feasibility of impact compaction on the foundation and subgrade compaction in Yellow River flooded area and explore construction process and control parameters that could ensure good compaction results, experiment was conduct on impact compaction. By way of detecting the influence of impact compaction on settlement, moisture content and degree of compaction in different construction technology to analysis the feasibility of impact compaction on the foundation and subgrade compaction in Yellow River flooded area. By evaluating the effect of compaction of different construction techniques, appropriate construction technology and control parameters of impact compaction on foundation and subgrade in the Yellow River flooded area was summarized. Research results showed that impact compaction had a good compaction effect on foundation and subgrade in Yellow River flooded area. For foundation compaction, discontinuous impaction construction should be adopted and control parameters should use degree of compaction and settlement and the best impaction times should be 12 -14 times. For subgrade compaction, the thickness of the loose layer should be 80cm and the best impaction times should be 25-30 times.
The Tensile Strength of Fresh Concrete after Simulated Earthquake at Magnitude of 6-8
Authors: Li Gu Hua , Wang Ke , Wei Jian Dong , He Guang Jie , Li Peng Zhou , Sun Lei
Published: October 2011

This study concentrates on investigating the tensile strength of fresh concrete after the occurrence of an earthquake. The experiments have been carried out through the simulated earthquakes that were generated by a high-performance vibrating platform with a size of 6m×6m, provided by the Nuclear Power Institute of China. There are three types of ground acceleration (0.05g, 0.10g, 0.25g) acting on 10 kinds the fresh concrete (C30 and C50) with five ages (12hours,24hours,48hours,72hours,168hours) respectively. The modified E1 centro was used to take the recordings of the time series of parameters. The results show that the tensile strength of the fresh concrete undergoing the simulated earthquake can be well recovered after 28 days.
Influence of the Isolated Layer Damping Distribution of the Lateral-Torsional Coupling Isolated System on Earthquake Response
Authors: Li Xiang Zhen , Xie Yi Feng , Li Bing
Published: October 2011

On the basis of the simplified model of lateral-torsional coupling isolated structure, dynamic equations of non-proportional damping isolated system of lateral-torsional coupling is established, and the influence of the isolated layer and the superstructure damping dynamic parameters on earthquake response is calculated and analyzed. The results show that, by reasonable adjustment of the damping distribution of the isolated layer, the torsion effect of the superstructure can be significantly reduced, and the basis displacement as well as rotation can be better suppressed, providing a basis for the design of the isolated layer damper reasonable distribution.
A Friction Damper with Variable Post-Sliding Stiffness
Authors: Wang Tao , Chen Xi , Teng Rui
Published: October 2011

Proposed in this study is a type of friction damper characterized a continuously variable post-sliding stiffness, which provides an increasing post-sliding force with the accretion of the deformation. It is possible to adjust the output force according to the performance targets at different earthquake levels, thus enlightening a practical approach to the explicit structure control to satisfy all of the required performance objectives. Theoretical analyses reveal that the parabola shape of the sliding surface would introduce a cubic force-displacement relationship, which was also demonstrated by sophisticated finite element models. The typical mechanic model was then incorporated into the source code of OpenSEES. The dynamic analysis gave reasonable results and experimental results also demonstrated that the proposed friction damper is able to reduce the displacement response and more important, is helpful to prevent a structure from collapse.
The Arch Sky Belly Arch and Arch Culvert Crack Disease Analysis of Arch Bridge
Authors: Bao Li Xin , Tang Xiao Xu
Published: October 2011

Arch type on an empty stomach type arch bridge and push culvert in the disease that can arise different level under temperature role. The reason that article produces for disease is analysed , push , Dao act on without the foot arch of circular arc in permanent year and temperature power calculation formula, have pointed out the theoretical source that the arch sky belly arch and arch culvert crack disease of arch bridge produce , and have made to administer the measure of this kind of disease.
The Experimental Study and CFD Analysis of Vortex-Excited Vibration of the Central-Open Box Section Cable Bridge
Authors: He Han Xin , Zhou Jian Long
Published: October 2011

As a new type of section, central-open box sections are more and more popular. Some existed bridges of central-open box section can not to be used because of vortex-excited resonance. Based on this situation, the paper taking the Hongkong-Zhuhai-Macao River-sea ship canal Bridge for example, takes measures of taking the central bottom plate opening hole, changing the angle of web, and setting baffle, according the experimental study and CFD analysis, it is obtained that different aerodynamic sections are various in the character of vortex-excited, although taking the central bottom plate opening hole is effective, it only refers to the best opening ratio, changing the angle of web can not improve the vortex-excited effectively, setting baffle on the lateral sides is the most effective measure to forbid the vortex-excited resonance.
Reliability Analysis on Stability of Retaining Wall
Authors: Li Qing Guo
Published: October 2011

The retaining wall structure reliability calculation model was established by identifying the stability reliability analysis function of retaining wall according to the geotechnical mechanics parameters’ interval characteristic. The method in this paper has been applied to the engineering examples, the results shows it is reasonable and practicable. The influence of geotechnical mechanics parameters on the retaining wall stability reliability index that was discussed in this paper has a certain reference value for engineering.
Research on Dynamic Performance of Concrete-Filled Steel Tubular Trussed Arch Bridge under Earthquake
Authors: Yan Xian Li , Li Qing Ning , Gao Chang , Wang Li Ying
Published: October 2011

Taking a double span- swallows-type CFST (concrete-filled steel tubular) trussed arch bridge as an engineering example; a spatial finite element analysis model is established to calculate its dynamic characteristic. The seismic responses in different earthquake input directions are calculated based on the elastic dynamic time history method. Results show that: the out-plane stability of the bridge is weaker than that of the in-plane; the torsion resistance ability of the bridge deck is smaller than that of the arch ribs; the axial force-Fx, shear force-Fz and bending moment-My of the bridge are mainly controlled by longitudinal seismic forces, whereas the shear forces-Fy, bending moment-Mz and torque-Mx are mainly controlled by transverse seismic forces; vertical seismic force has a considerable effect on internal forces of the bridge, so it can not be ignored in seismic design.
Bonding Mechanism of Horizontal Construction Joints
Authors: Wei Chun Ming , Su Hui , Zhao Qiang , Bi Chun Li
Published: October 2011

The quality of construction joint is significantly influenced by the precision in the concrete placement. In order to obtain the mechanical properties of horizontal construction joints surface, a comprehensive research was conducted. The research focused on the tensile capacity and seismic behavior of construction joints surface. According the tests failure characteristics, four kinds of cracking model of construction joints zone were formed. Test results indicated that bond materials could increase displacement ductility more than 10％～30％. And the clamping action provided by bond materials was so good that failure didn’t occur at the construction joint itself, but in the concrete adjacent to it. Axial compressive force is advantageous for the shear capacity of construction joint interface.
Construction Safety Evaluation Based on Extension Theory
Authors: Yang Mao Sheng , Liu Lei
Published: October 2011

In order to assess the standardization of safety accurately and objectively, this paper establishes the safety evaluation index system for the building construction according to engineering experience. The weight of each index is decided reasonably by the Analytic Hierarchy Process. Based on extension theory, the evaluation matter —element model for evaluation of construction safety is established, and the extensional evaluation method with correlative functions is put forward. Thus, construction safety is systematically evaluated. Finally it verified by project example, the result proves its feasibility.
Inheriting the Cultural Context and Constructing the System of Urban Characteristics: A Case Study of Nanjing
Authors: Ji Lei , Huang Jiang
Published: October 2011

Nowadays, globalization is gradually sweeping across the world, and the traditional cultural context of the city receives unprecedented impact, the urban characteristics are gradually disappearing and there appears to be the phenomenon of “thousand cities with one face”. In such circumstances, looking through the cultural traditions of the nation, inheriting the cultural context of the city and keeping its own cultural independence and the urban characteristics have been an important issue concerned by the countries. This text takes Nanjing as an example to research on the culture of the city under the regional background from the aspects of geography, culture, economy, society and so on along the historical context. On this basis, there is also a discussion about constructing the system of urban characteristics of Nanjing, underlying causes of and approaches to deal with the the characteristics crisis of current Nanjing City.
Damage Analysis and Numerical Simulation for Failure Process of Extra-Long Pre-Stressed Concrete Beams
Authors: Yuan Jian , Zhu Wen Gang , Chen Min
Published: October 2011

The failure process for an extra-long pre-stressed concrete beam under static loads was simulated based on the elastic damage theory with the commercial software ABAQUS. By taking account of the different damage behaviors of concrete under tension and compression conditions, a damage mechanics model with three independent parameters was derived from the elastic damage theory. By combining the proposed damage model with the ABAQUS, the damage model was added to UMAT user subroutine. This method was developed to analyze the failure process of the extra-long pre-stressed concrete beams. The theoretical results show that the proposed damage constitutive model can be applied to describe the damage and fracture behaviors of the extra-long pre-stressed concrete beams.
Study on Tower’s Stability and Construction Control of Basket Handle Arch Bridge when Vertically Rotating
Authors: Wu Xiao Guang , Gu Jian Feng
Published: October 2011

Taking a half-through concrete-filled steel tube(CFST) tied arch bridge with span arrangement (40m+200m+40)m as an example, this paper make a study of tower’s stability, construction monitoring and control during vertical rotation of the arch rib. Using the finite element method to simulate the rotation construction phase of the bridge by the way of normal erection calculation, the effect of several different factors to the tower’s instability is analyzed in detail. On the basis, we obtained the effective measure to ensure the tower stable. Meanwhile, survey the tower’s stress and deformation to supervise the tower during the rotation construction. Finally control tower top displacement and its foot stress to guarantee the rotation construction of the CFST arch bridge quality and safety.
Relational Study between Human Capital and Competition Ability of Construction Enterprises
Authors: Zhou Yong , Liao Wei
Published: October 2011

With China's accession to the WTO and the development of knowledge economy, human capital's role in the construction business has become increasingly important. human capital has become a key factor in the competitiveness of enterprises. This paper analyzes the human capital and competitiveness of construction enterprises Mechanism. And on this basis, bring up the corresponding strategies human capita in lnvestment to improve the competitiveness of construction enterprises
Mix Design of Compaction-Free Porous Concrete Permeable Base
Authors: Sheng Yan Ping , Li Hai Bin , Guan Bo Wen
Published: October 2011

Moisture damage is one of the main forms of early failure in the asphalt pavement. Setting porous concrete permeable base can release water from the road structure. The common construction technology for porous concrete is traditional vibration compaction, which is helpful for the strength formation of the base, but unhelpful for the stability and smoothness of the base.In this sdudy, Compaction-free Porous Concrete (CPC) permeable base was proposed, which can not only satisfies the strength requirement of structures, but also guarantees the stability and the smoothness of the base. The idea of volume method was adopted on mix design of CPC. Mix proportion parameters such as aggregate dosage, cement dosage and water dosage were calculated and confirmed based on experimental study. The performance test results show that CPC designed by this method can satisfy the design standard. Accordingly, the design method of CPC is feasible.
The Research of Corroded Stell-Structured Surface Characteristic
Authors: Xu Shan Hua , Shi Bin , Yang Xin Long
Published: October 2011

Parameter method and fractal theory are carried out for appraising corroded the stell-structured surface of the atmospheric acid corroded the environment. Provided three dimensional parameter definitions. reference datum and computing method of fractal dimension, adopted non-contact-type infiniteFocus full-automatic zooming 3-D superficial measuring apparatus and MATLAB software to deal with the resulting data of the experiment, the results show that parameters method and fractal theory to comprehensive evaluation of corrosion surface of steel structure is more reliability.
The Shear and Durability of CFRP Reinforced Concrete Beams
Authors: Ge Ruo Dong , Yin Zheng Zhuo , Zhang Ji Hong
Published: October 2011

At present, the research on the performance of the shear and durability of CFRP reinforced concrete beams is few, the destruction of the curved and scissor section is often much subtle and suddenly. Based on the experimental investigation on the durableness of the CFRP concrete beams which has been shear reinforced and non-reinforced in the chloride ion erode, a comparative analysis on the fissure development, deflection, electrochemistry index and strain of the concrete beam were given under load. The results indicate that carbon fiber could limit the fissure development efficiently, and there were not the shear failure after loading, the beams with carbon could improve its shear capacity and durability efficiently, But The increase of durability is more depends on the reinforcement way.
Experimental Research on Earth Pressure of Double-Sided Reinforced Earth Retaining Wall
Authors: Su Jun , Chen Hong Guang
Published: October 2011

According to a highway expansion project, this paper makes field obversations on earth pressrue of double-sided reinforcement retaining walls and studies distribution of it. Test results show earth pressure on the back of double-sided reinforcement retaining walls grows with increase of filling height during construction and the distribution is nonlinear along with height of the wall, the maximum is at the base. Measured values of vertical earth pressure are lower than theoretical ones. And this structure of double-sided reinforcement retaining walls has low requirement on bearing pressure of foundations. The results can be used as a reference for further application in future.
Finite Element Modeling of Drying Shrinkage in Concrete Blending with Mineral Admixtures
Authors: Wang Tie Cheng , Peng Quan Min
Published: October 2011

Drying shrinkage is a critical factor influencing the long-term behavior of concrete. In this paper, related parameters for calculating moisture field are discussed based on the theory of nonlinear moisture diffusion. Numerical simulation of shrinkage tests of concrete blending with fly ash and ground granulated blast furnace slag is conducted by ANSYS, considering the solution analogy between moisture field and temperature field. The calculated shrinkage strains are in good agreement with experimental results and the adopted model and finite elements method can be used to predict the time-dependent moisture field and shrinkage strain field in the real structure.
The Finite Element Analysis on Axial Tensile Bearing Capacity of Round Steel-Tubes Reinforced with CFRP Sheets
Authors: Wang Xiu Li , Li Jun Jie
Published: October 2011

The numerical simulation calculation on round steel-tubes reinforced with CFRP sheets was done through the large-scale finite element software ANSYS. In this research, four factors were comparatively analyzed so as to obtain the influence of them on ultimate axial tensile bearing capacity of steel-tubes. These four factors are longitudinal reinforcement length rate , thickness , elastic modulus and circumferential reinforcement ways of CFRP sheets. The results show that the ultimate axial tensile bearing capacity of steel-tubes strengthened with CFRP sheets is enhanced significantly and the reinforcement effect is very good.
Use of Fuzzy QFD in Construction Project Developing
Authors: Feng Ya Hong
Published: October 2011

Quality function deployment (QFD) is a process that has been used for managing the development of new manufactured products. In this process, both spoken and unspoken needs of the customers are determined, prioritized, and translated to design parameters. The aim of this paper is to propose an original approach for the management of construction project development process. The approach is based on the QFD, and fuzzy logic is also adopted to deal with the ill-defined nature of the qualitative linguistic judgments required in the proposed house of quality (HOQ). Specifically, the paper addresses the issue of how to deploy the HOQ to effectively and efficiently improve construction project development processes and thus customer satisfaction.
Experimental Study on Mechanical Behavior of Serving Prestressed Concrete Poles
Authors: Xia Kai Quan , Zhang Xiang Gang , Chen Zong Ping , Wang Jiang Mei
Published: October 2011

In order to assess accurately safety performance of prestressed concrete poles servicing 30 years, bending loading tests are carried out on 3 samples extracted randomly, these ones are studied on the mechanical behavior and failure mechanism, failure modes are revealed, and important experimental data including cracking load, the ultimate load of normal use, the ultimate load of carrying capacity is obtained. Furthermore, based on measured test data, the curves of load-crack width and moment-deflection are made among the whole force process. The results show that failure modes of specimens are similar to one of “rare-reinforced beams”. Moreover, based on design method of serviceability limit state, the average security surplus coefficient is 1.2 before collapse damage.
Shear Plane Found in the Interior of Soil/Rock near a Tunnel Damaged in 2004 Niigata-Ken Chuetsu Earthquake
Authors: Zhao Yu , Tomiyasu Yuriko , Konagai Kazuo
Published: October 2011

Landslides triggered by earthquakes are one of the most damaging natural disasters. Recently, cutting-edge technologies such as Light Detection and Ranging (LiDAR), Interferometric Synthetic Aperture Radar (InSAR) method have allowed us to combine a spatial data set of landslides with topographical information etc. However, remote detection of landslides may cause missing slightest signs of hidden landslides. Damages to Kizawa Tunnel and other facilities in its vicinity in the 2004 Niigata-ken Chuetsu Earthquakee are firstly introduced. Moreover, two wells at #1 and #2 respectively to the south of Kizawa tunnel were found dislocated in further survey. Dislocated wells together with other previous findings indicate that Kizawa helmet are all lying on about the same plane suggesting the presence of large shear plane and therefore the importance of thorough investigations.
A Research on the Planning Strategy of Eco-Demonstration Zones in High Altitude Areas — a Case Study of Tanggula Town
Authors: Wang Jin , Duan De Gang , Shen Jie
Published: October 2011

The unruled development of construction land, along with the disordered planning and deteriorating living environment, etc. has long been prevalent in those small towns in the Qinghai- Tibet Plateau. This paper, thus, conducts some on-the-spot investigations and analyses of Tanggula town. The paper departs from the disparities between the current conditions of Tanggula town and the standards of eco- demonstration zone, proposing some strategies in the aspects of development direction, land use layout, facility layout, architecture and the town's features, aiming to exert positive influence upon the planning of small towns in plateaux.
Sustainable Urban and Space Planning Strategy
Authors: Zhang Zhong Hua , Zhang Pei
Published: October 2011

This paper concludes and analyses the main contents of sustainable urban space researches, including various viewpoints and spatial conceptions. Key issues and trends of sustainable urban space planning are analyzed from the aspects of space, material, society and culture. This study will further clarify the characteristic development elements involved in urban planning guidelines, promote planning of an ecological and socially sustainable new urban, and enhance the completive edges of the urban in global urban hierarchies.
Application of Phased Array Antenna Technique in Structural Damage Detection
Authors: Zhang Yu , Yu Long , Yan Yun Ju , Guo Yu
Published: October 2011

Over decades phased array antenna technique attracts much more attention in Lamb wave based structural damage detection. Lamb wave generated by the piezoelectric wafers omnidirectionally could be steered at a specific direction during its propagation. Thus, the wave beam steering and focusing has been established, the location of structural damage is done with pulse-echo method by wave propagation. However, the detection accuracy will decrease as side bands energy leakage during wave propagation, so, signals to be generated have to be modified by window tone burst in order to concentrate energy in main bands and minimize the effect of dispersion side bands. In this paper, signals modified by Hanning-windowed tone burst was used to decrease the effect of side bands energy leakage, the results improved the detection accuracy better than signals without window tone burst and show good agreement with theoretical results. Meanwhile, A numerical simulation of aluminium plate demonstrates that phased array antenna technique is feasible in structural damage detection.