bluuebunny/crossref_metadata_2025 huggingface dataset:
Application Examples of Auto-Regression and Subsection-Regression for Tunnel Distortion Analysis
Authors: Zeng Shan
Published: March 2013

Forecasting the distortion of civil engineer projects need the support of mathematical statistical theories. The mathematical statistical theories have many different types, such as auto-regression and subsection-regression. The author supervises the tunnel settlement by those two theories, the result shows that: the auto-regression theory is suitable for the project safety & quality forecasting; if the project has regularity changing during distortion process, the subsection-regression theory is a very good tool when the supervision situation needs different mathematical models to describing.
Guiding Survey Technology for Long Curved Pipe Jacking
Authors: Liu Shao Tang , Pan Guo Rong , Zhang Hui Feng
Published: March 2013

The paper discusses guide survey system in long distance curved pipe jacking, presents a three-dimensional datum transformation model to determine the orientation of jacking pipe，The unitary principle and the new navigating method are introduced and the methods accuracy and variance are analyzed. The intelligence guide system is carried through easily associate with total station. The mathematical model, the operation principle, the hardware realization of extra long pipe jacking automatic guidance are introduced. Practice shows that all the reference points are used more efficiently in the new model than in the general model, and the surveying and navigating system gets enormous time-saving against conventional methods
Application of Rocks Removal Technologies before Shield-Driving in the Line 9 Guangzhou Metro
Authors: Zeng Lv Xian , Hu Wei Dong , Xiao Si Xi
Published: March 2013

Detailed geological profile and complementary prospecting histogram revealed a series of hard rocks in the Line 9 tunnel of the Guangzhou metro, greatly increasing the difficulty of shield construction. The geological and hydrological condition of the project was very complex and vertical shafts were used to remove the rocks in order to reduce the cost of the project. Reverse construction technology was applied to the construction of vertical shafts. The calculation of internal forces and relevant design of the vertical shaft wall are introduced herein. The vertical shafts and surrounding buildings were monitored and the monitored contents are also described in detail. At the same time, some emergency measures were applied to ensure the safety of the project. The rocks removal technologies before shield-driving in the line 9 of the Guangzhou metro are introduced herein and the results can be referenced to other similar projects.
Comprehensive Assessment Method Based on Blind Information Theory in Highway Tunnel Construction
Authors: Ye Fang Zheng , Zhan Hui Ming , Su Shu Xun , Gong Wen Hui
Published: March 2013

In the highway tunnel construction, monitoring parameters are so various, and along with the construction uncertainties, it is very difficult to adopt one fixed model to generalize the complicated law of the monitoring information. Therefore, we choose data in different periods and assign the data with corresponding credibility respectively, and then the monitoring result is described using blind information. In this paper, the theory of blind information is introduced first, and then the blind information is applied in the engineering case of comprehensive assessment of tunnel safety monitoring. The research result has demonstrated that processing the monitored values by applying blind number can largely weaken uncertainty of the monitored information, and makes the evaluation of the construction safety issue more detailed and comprehensive, which overcomes the traditional methods’ defect that describes information too absolutely. The result indicates that blind data is valuable for comprehensive assessment of tunnel safety monitoring.
Evaluation of the Flexural Performance of Fiber Reinforced Mortar with Low Fiber Content
Authors: Choi Sung Yong , Park Young Hwan , Jung Woo Tai
Published: March 2013

This study investigates the relationship between the amount of fiber reinforcement and flexural tensile capacity by evaluating the degree of dispersion and the fiber reinforcement effect in mortar mixes with low fiber contents (lower than 0.2%) in order to derive solutions enabling to improve the tensile performance of mortar with low contents in macro fibers. The results show that a certain degree of improvement of the toughness is achieved even in the case of fiber reinforced mixes with low fiber contents and that the variation of the toughness capacity is sensitive to the degree of dispersion of the fibers.
Experimental Study on Bending Behavior of Cold-Rolled Deformed Steel Bars Reinforced Concrete Slabs
Authors: Chen Qing Jun , He An , Pan Guang Bin , Cai Jian , Li Jun , Yang Chun
Published: March 2013

Cold-rolled deformed bar with wing is a new type of cold-rolled deformed bar, it has high tensile strength and better ductility than the general cold-rolled deformed bars, and has good bonding properties with concrete. Five types of totally 15 full-scale specimens were tested to investigate the mechanical behavior, failure mode and the suitable value of minimum reinforcement ratio of concrete slab with cold-rolled deformed bar with wing. Experimental parameters include the reinforcement ratio, concrete strength, and reinforcement diameter. The deflection of mid-span, the strain of cold-rolled deformed bar and the crack width measured under each load level were studied. The test shows that the specimens with the reinforcement ratio of 0.15% present ductile failure, while those with the reinforcement ratio of 0.12% present brittle failure. Based on the results of the experiment, this paper suggests that the value of minimum reinforcement ratio of concrete slabs with cold-rolled deformed bar with wing could be 0.15%.
Durability Research of Thermal Insulation Glazed Hollow Bead Concrete
Authors: Zheng Xiao Hong , Li Zhu , Liu Yuan Zhen , Qin Shang Song
Published: March 2013

The durability of thermal insulation glazed hollow bead concrete, which is a kind of structure self-thermal insulation material produced in the background of building energy efficiency, has been systematically researched in order to make it with a good workability. Theoretical analysis and experimental study have been made from the raw materials and construction mixing proportion in the basis of the analysis to the influencing factors of its durability so as to can improve its durability.
Application of Intensification Approaches on Recycled Aggregate
Authors: Yin Jian , Pang Qi Ling , Chi Yi
Published: March 2013

The wasted cement mortar and internal cracks induced by the secondary breaking process existing on/in recycled aggregates lead to significant reductions in the apparent density, strength and durability of recycled aggregate concrete compared to those of natural aggregate concrete. In this study, recycled aggregate intensification approaches was proposed by removing the old cement mortar from recycled aggregate surface through mechanical agitation, and immersing the recycled aggregate in chemical solutions. A series of laboratory experiments were carried out to validate that the proposed approach could improve various performances of the recycled aggregate, as well as the concrete made of it. The testing results showed that through the combination treatment or modification of mechanical and chemical intensification, both of the compressive and flexural strength of the recycled aggregate concrete could be increased to some extent.
Time Effect of the Pile Bearing Capacity in Dredger Fill
Authors: Lei Hua Yang , Lv Qian Qian
Published: March 2013

The dissipating of pore water pressure caused by pile sinking is one of the main factors resulting in time effect of ultimate bearing capacity of pile.The pore water pressure is monitored at each observing point during pile sinking and after that. With the pore pressure plan embedded in advance, by means of spot test in the process of pile sinking, under this geological conditions of the pile foundation by referring to the second phase project of the free port logistics processing zone in Dongjiang, Tianjin.The change law of the distribution and dissipation of excess pore water pressure with time, depth, radial distance and permeability coefficient of soil was also discussed. It’s found that the excess pore water pressure attenuates approximately linearly with the increase of the distance from the pile heart and the scope influenced is around 10d. As the numerical simulation accord with the test results effectively, promote the results then get the change rule of pile bearing capacity with time.The formula of pile bearing capacity about time effect in dredge fill was deduced for engineering reference.The effect of soil internal friction angle on the ultimate bearing capacity of pile was discussed. Numerical simulation shows that the ultimate bearing capacity of pipe pile increases over time and keeps stable after 20d.The ultimate limit bearing capacity is 1473kN with increase of 12.3%, the time when it reaches the stable state is in accord with the excess pore water pressure dissipation monitored at each observing point. The larger the internal frictional angle of soil becomes, the more the ultimate bearing capacity is. The angle exceeding 20°,the bearing capacity would not increase as internal frictional angle of soil increases.
Optimum Design for the Bracing Structure of a Foundation Pit
Authors: Xie Zhi Ying , Wei Ke Feng
Published: March 2013

This paper presents an optimum design model for the bracing structure，Based on a foundation pit project as an example, five different design schemes by the optimization and selection, to clarify the combined support scheme in practical engineering applications and conducted technical and economic analysis, by monitoring the results and use results to prove its feasibility, a number of similar projects come to a certain reference value of the conclusions for similar reference works.The Optimum calculation results of the example shows the optimum design could produce obvious economic results when it used in the design for the bracing structure of foundation pit.
Influence of Soil Consolidation History on Seismic Response of Underground Structure in Layered Liquefiable Ground
Authors: Xia Zhi Fan , Zheng Yan Ling , Ye Guan Lin
Published: March 2013

It is shown that liquefaction induced uplift is one of the most typical disasters for underground structures in liquefiable zone. Though a lot of researches were conducted to investigate the uplift phenomenon of underground structures in the past years, further studies need to be carried out to discover its mechanism because the seismic responses were correlated with many factors. In the paper, a fully coupled dynamic analysis was performed to investigate the dynamic responses of underground structure in layered saturated ground. The soils were simulated by a cyclic mobility constitutive model, which adopted some important concepts such as stress induced anisotropy, subloading yield surface, and superloading yield surface. It was verified that the constitutive model can perfectly describe the dynamic character of both liquefiable sand and non-liquefiable clay. Simulated results were obtained for excess pore water pressure and deformation of soil deposit and uplift of underground structure. Special emphasis was given to discuss the influence of soil consolidation history on the seismic responses of underground structure. Simulation indicated that with the occurrence of liquefaction, soils at lateral sides of underground structure flowed toward the bottom of the structure, which led to the uplift of structure. Results also showed that the excess pore water pressure ratio of liquefiable soil decreased with the increasing of soil pre-consolidation pressure. Then the liquefied zones diminished, and the uplift of underground structure reduced.
Estimation of Active Earth Pressure on Retaining Wall with Translation Mode
Authors: Yang Qing Guang , Liu Jie , He Jie , Luo Shan Huang
Published: March 2013

Considering the movement effect of translation mode，friction angle reduction coefficient and method of bevel-layer analysis,estimation of active earth pressures is deduced for cohesiveless soil retaining wall with translation mode.In order to validate the feasibility of the proposed approach，a model test for active earth pressures was conducted in laboratory;and the proposed method was used to analyze this model. Experimental and theoretical results indicate that the curve of active earth pressure increases firstly and decreases then along the depth of retaining wall with different values of s/sc,and it has a point of intersection with the curve of Coulomb active earth pressure at the depth of 0.6H，where H is the wall height. Further study indicates that the action point position of the active earth pressure is higher than 1/3 times wall height.
Construction Method and Numerical Analysis on the Bearing Capacity of the Large Diameter and Abyssal Pile Located in Complex Karst Area
Authors: Yi Jin , He Guo Jing , Liu Si Si , Li Zhi Yong , Zheng Zu En
Published: March 2013

This paper introduced construction method for deep pile of Zishui bridge through karst region and the checking results of the pile bearing capacity. Firstly, main structure of Zishui bridge was simply introduced. Secondly, according to the special geological conditions, construction methods for bored piles in water and drilling platform were described. The discussion focused on the problem of boring and grouting in karst foundation and their solutions. Finally, to ensure that the pile capacity can meet the design requirements, load transfer method was used on the part of pile foundation to calculate the bearing capacity. Results showed that pile bearing capacity meet the requirements, and the feasibility and correctness of construction method of Zishui bridge was also verified,which provides references for the design and construction of the same civil engineering.
The Research on the Liquid Plastic Limit of Completely Weathered Granite Improved Soil
Authors: Yi Wen , Wang Yong He , Xie Zi Xin , Qu Chang Zi
Published: March 2013

In this paper, we studied mechanics characteristic of whole weathered granite improved soil. We analysesed its changes of fluid plasticity index before and after improvement in different compaction condition. We improved the full weathering granite by adding different proportion of lime and cement. We analysised the changes of liquid limit and plastic limit of improved soil in the different mixed ratio condition and we got the conclusion that the improved soil plasticity index decreased with lime or cement dosage increases, also changed over time. Improved soil liquid limit, plastic limit and plasticity index changed with the addition of lime, cement dosage changes exponentially.
Research of Direct Calculation Method for Design on Cross-Section of Retaining Wall
Authors: Huang Wei
Published: March 2013

Based on meeting the requirement of ground bearing capacity, the allowable range of anti-overturning safety factor is derived. The relative parameters are expressed with base width and the relation graphs of conversion factor are presented, and then can design the cross-section of retaining wall directly by combining the stability requirement of anti-sliding. The calculated result shows that this method makes the design simple and reliable. It may be a reference for engineers.
The Value of Research, Inheritance and Development of East Hunan Folk House
Authors: He Wei , Luo Yan Yue , Zhang Su Shan , Hu Xian Jun
Published: March 2013

The folk house of Zhuzhou, Liling, Youxian and Liuyang situated on the east Hunan is taken shape by two varieties of historical culture in Hunan and JiangXi province. The folk house has great value of research in history, culture, environment, architectural space and art. This paper aims to discuss about the research value of the folk house, and the methods of inheritance and development.
Effect of Local Flange Damage on the Stability of Steel Columns
Authors: Fogarty J. , El-Tawil Sherif
Published: March 2013

The stability of steel columns that have suffered localized damage is investigated through analytical and computational means. An analytical model based on the Rayleigh-Ritz technique is used in conjunction with detailed finite element models to study the effect of damage extent and location on column load carrying capacity. Analytical and simulation results show a severe reduction in column axial resistance in the presence of localized flange loss.
Research and Analysis of Shear Connector in Prestressed Concrete Box-Girder with Corrugated Steel Webs
Authors: Li Ming Hong , Wang Yi Li , Zheng Shang Min , Wan Shui
Published: March 2013

The prestressed concrete box-girder with corrugated steel webs is a new type of steel-concrete composite structure. It has some advantages comparing with traditional prestressed concrete structure. Shear connector is a decisive component with which steel and concrete can work together in steel-concrete composite structure. In this paper, the most commonly used forms of shear connector in prestressed concrete composite girder with corrugated steel webs are introduced. The method of design and calculation of shear connector is described. Furthermore, the engineering design case of shear connector in the 4th Nanjing Yangtze River Bridge North Terminal Chuhe Bridge is presented. The method can be taken as a reference to the design of shear connector in the same kind bridge.
Flexural Bearing Capacity Research of Composite Beams with Edge Constraint Component
Authors: Wang Yang , Li Tian
Published: March 2013

To investigate the flexural bearing capacity in negative moment region of composite beams，we examined different ends constraint components. The modeling of the beam ends connected framework has been done by the finite element software ANSYS. The concrete thickness, slab reinforcement ratio and different component at the edge of the composite framework in the negative moment region are taken into account. The performance during the process of deformation and failure are got by nonlinear analysis. The flexural bearing capacity was reported, with the negative moment region of the composite frame beam, it revealed great differences when the beams are different component. Simulation results show that the concrete thickness take the biggest influence on bearing capacity. The results showed the behaviors of the composite frame beams are different with positive moment region, and calculation based on current code for design of steel structure (GB50017-2003) would be a big deviation.
Application of Differential Transform Method to Buckling Problems at Clamped-Free Boundary Conditions
Authors: Han Ling Feng , Wu Shi Yuan
Published: March 2013

Differential Transform Method (DTM) is a new semi-analytical, semi-numerical algorithm, which transforms differential equations to the form of Taylor series. The method derives an approximate numerical solution based on Taylor series expansion, which is a analytical solution built on polynomial form. Traditional Taylor series method is used for symbolic computation, while the Differential Transform Method obtained the solution of the polynomials through itineration calculations. Applying DTM to buckling problems, the critical length of a bar at clamped-free boundary is studied. The computational results are compared with analytical solutions and shown excellent agreement between those two algorithms. The method adds a new tool for computational engineering mechanics.
Effect of Friction Bearing Ratio on Isolation Performance and Nonlinear Property in Parallel Composite Isolation System
Authors: Yuan Ying , Zhou Ai Hong , Gao Yan Li
Published: March 2013

Different friction bearing ratios have effects on the base isolation property of parallel composite isolation system subjected to the seismic excitation. In order to deeply investigate how the friction bearing ratio affect the isolation property, the numerical simulation was carried out by the time-history analysis method, in which the seismic response of parallel composite isolation system with different friction bearing ratios under different acceleration peak values were calculated. Then, the effects of different friction bearing ratios on the base maximum shear coefficients and base maximum displacements; the hysteretic characteristics and nonlinear properties were analyzed and discussed. The results show that, for the parallel composite isolation system, friction bearing ratio is a key factor affecting the isolation property and the nonlinear properties are tightly related to the friction bearing ratio and acceleration peak values.
Research on Seismic Performance of Large Span Integral Suspended Ceiling Structure in Decoration Engineering
Authors: Zhang You Jun , Tang Zhong Ping , Liu De Lai
Published: March 2013

The natural vibration frequency, characteristics of vibration mode and deformation of large span integral ceiling structure in a hotel under earthquake were studied using the ANSYS Software, then some useful suggestions on hoisting position, pull rod and other factors were put forward for seismic constructional design of large span integral suspended ceiling structures.
Response Spectrum Analysis of a Large-Span Hangar Subjected to Multi-Dimensional Seismic Inputs
Authors: Xu Yang , Zhao Jun , Xu Xiao Yan , Zhu Dan
Published: March 2013

The multi-dimensional seismic response of a single-span hangar was studied by response spectrum analysis method. The lateral displacements of the structure, forces of its supporting columns and its roof structure were calculated and compared with each other for cases of one-, two- and three-dimensional (1D, 2D and 3D) seismic inputs. The results show that, compared with the case of 1D earthquake input, the effects of horizontally 2D earthquake inputs on the internal forces and displacements of its supporting columns in the primary direction of input are obvious when it is along the symmetrical axis of the hangar and their effects in the secondary direction of input are even more important which results in great increases of the internal forces and displacements in that direction. The vertical seismic input has almost no effect on the internal forces and displacements of columns. The internal forces in different parts of the roof structure are controlled by horizontal or vertical inputs, respectively, and, compared with those from horizontally or vertically 1D inputs, the responses from 3D inputs are increased and the effects should be considered in seismic design.
Seismic Response Analysis on a Chaotic System
Authors: Liang Cui Xiang
Published: March 2013

This paper is concerned with the dynamical behavior of a chaotic system which is a model for seismic response of structures. The local bifurcation of the non-hyperbolic equilibrium point of the chaotic system is investigated by using center manifold method. The transcritical bifurcation is analyzed in detail. Based on numerical simulations, spectrums of maximal Lyapunov exponent and the bifurcation diagrams are presented for the dynamic analysis. The method proposed can be used as a reference of nonlinear seismic response analysis.
Seismic Response Analysis on Non-Proportional Damped System by Using Perturbation Technique
Authors: Qin Jin Qi
Published: March 2013

A simple method for seismic response analysis on multi-degree-of-freedom (MDOF) system with non-proportional damping is proposed. Based on the real modal theory, transforming the system from physical coordinates to modal coordinates, the damping matrix is a relatively small amount compared with the mass matrix and the stiffness matrix, so the damping matrix may be denoted as a small amount. The approximate analytical solution of the non-proportional damped system can be obtained by using the perturbation technique which can be used as a reference of seismic response analysis of complicated structures.
Locating Rescue Drilling in Deep Tunneling Disaster
Authors: Liu Shao Tang , Liu Xi Rui , Pan Jie Chen
Published: March 2013

In order to ensure accuracy of positioning rescue drilling, studied over technical basis required for precise drilling location and confirmation method for locating of finished underground drill-hole and surface drilling hole. Put forward the technical basis for formulating drilling-positioning scheme, Discussed underground finishing drilling of hole positioned by synthesis method and surface drilling center determined by total station with GPS RTK and give demonstrates with cases. Related studies indicated that mutual verification with two or more methods above are key measures to ensure positioning accuracy.
Environmental Impact and Hazard Control Method on Deep Foundation Pit Supporting Engineering
Authors: Han Guang Dong , Guan Chang Sheng , Zhou Jing
Published: March 2013

This dissertation mainly analyzes that the deep foundation pit engineering in civil construction, which may impact on the environment and could cause disasters. Dealing with the deep foundation pit engineering to the control ofinternal process and harmony of exterior environment system research, which puts forwards the corresponding measures to conserve the environment.
Chitosan/Sodium Alginate, a Complex Flocculating Agent for Sewage Water Treatment
Authors: Yuan Yi Hua , Jia De Min , Yuan Yan Hao
Published: March 2013

The effectiveness of the treatment to sewage water by using chitosan, sodium alginate and their complex as flocculating agent was investigated. It was discovered that parameters, such as pH value, temperature, speed and time of stirring, and setting time had direct relations with flocculants. Color/turbidity removing rate could be up to 90% with 15mgL-1 chitosan solution, while sodium alginate alone cannot act as flocculant since no floccules can be observed. Chitosan/sodium alginate complex flocculating agent was found to be an excellent coagulant which made a compliment with each other. The optimum dosage was 15mg L-1 chitosan plus 7.5mg L-1 sodium alginate for complex agent. The results of the orthogonal experiment showed that the optimum conditions to treating sewage water were 70°C for temperature, pH=5.5, fast stirring（600r/min or 900r/min） for 2min, plus slow stirring（100r/min or 300r/min） for 8min, and setting time 2.5h. In this case the chitosan/sodium alginate complex agent could achieve 100% color/turbidity removing rate and approximately 90.01% COD reducing rate.
Contrast Studies of Ultrasonic Degradation Rhodamine B and Methyl Orange Dynamics
Authors: Wang Zheng Fan
Published: March 2013

The study compared rhodamine B and methyl orange aqueous solution of sonochemical degradation kinetics, the influence of ultrasonic power, initial concentration, operating temperature on reaction rate. The experiment show that degradation reaction is free radical oxidation organic matter generated by ultrasonic cavitation, rhodamine B and methyl orange initial concentration of 0.5×10-5- 4.0×10-5 mol/L, operating temperature of 25°C - 55°C, when ultrasonic frequency of 19.6 kHz, ultrasonic power of 170-260 W. sonochemical reaction of rhodamine B and methyl orange are in line with first order reaction kinetics, and sonochemical reaction rate constant increased with increase of ultrasonic power, with increase of initial concentration decreases, the lower operating temperature; under the same experimental conditions, the rate of chemical reaction of rhodamine B sound greater than the rate of sonochemical reaction of methyl orange.
Thermal Decomposition Kinetics of RDX with Distributed Activation Energy Model
Authors: Chen Ming Hua , Zhang Tao , Chang Wen Ping , Jia Xiao Biao
Published: March 2013

The thermal decomposition kinetics of RDX at different rates was studied by thermogravimetric analyzer(TG) and the activation energy of RDX was calculated by distributed activation energy model. It is shown that the thermal decomposition processes of RDX were divided into three stages according to the TG curves, they are molten stage, thermal decomposition stage and eng stage. The activation energies of RDX are all between 124.34 and 181.48KJ•mol-1 in the thermal decomposition stage of non-monotonously increasing. The activation energy of RDX is 139.98 KJ•mol-1 in the molten stage, and the thermal decomposition stage is167.24KJ•mol-1.
Analysis of Organic Pollutants from Biologically Treated Coking Wastewater in a Multiple Barrier Method
Authors: Zhang Hui Qin , Ye Chun Song , Yang Fan , Zhang Xian , Yang Hong , Liu Guang Rong
Published: March 2013

The objective of this study was aimed to investigate the COD removal from biologically treated coking wastewater with a multiple barrier process of coagulation-flocculation (CF)/Fenton oxidation (FO)/ powdered activated carbon (PAC) adsorption. Optimized parameters validated by a series of processes were found to be FeCl3 concentration of 320.0 mg/L, anionic polyacrylamide (APAM) of 0.8 mg/L, the mass ratio mH2O2/mFe2+ of 4.7 and 500.0 mg/L of PAC, respectively. The total COD removal of 88.1% was obtained. Furthermore, through GC/MS analyzing of treated coking wastewater by stages, which was consistent with the COD removal. The results showed that the effluent treated by the integrated processes could meet the national second-grade standard of sewage comprehensive discharge in China and the requirements of reverse osmosis (RO) feed water. This implied the multiple barrier method had promising in practical applications.
Study on the Tolerance and Adsorption of Five Heavy Metal Ions by a Radiation-Resistant Acinetobacter sp.
Authors: Zhu Jing , Xie Yu Qing , Song Su Qin , Zhang Zhi Dong , Wang Wei , Gu Mei Ying , Tang Qi Yong
Published: March 2013

To investigate the tolerance and adsorption of five heavy metal ions by radiation-resistant microbes, a radiation-resistant strain NO.9 was identified according to 16S rDNA gene sequence analysis and Biolog system, and the tolerance and adsorption to five heavy metal ions was analysed. The results showed that it had a maximum tolerance 2200mg/L to Pb2+, and it had adsorption ability to Pb2+、Cu2+、Hg2+、Zn2+ and Co2+under the situation as followes: 0.1g the amount of cells, at pH 6.0, 20°C and adsorbed for 40 min. it reached a maximum adsorption 98.9% to Pb2+, and the amount of adsorption was 39.56mg/g. It indicated the strain NO.9 had a strong tolerance and absorption to Pb2+. This assay laid a theoretical basis and technological foundation for further study of the radiation-resistant microorganisms in the heavy metal pollution.
The Modeling of Petrochemical Wastewater Activated Sludge System and Water Quality Forecast Based on Neural Network
Authors: Yan Zhuang , Di Tian , Ye Yan Liang , Han Wen Ju
Published: March 2013

Aiming at the petrochemical wastewater activated sludge system, using the Elman neural network modeling technology, through the improvement structure to improve the dynamic performance of the network, check and repair etc data preprocessing methods, combined with object characteristics selected input variable, construct the neural network model. The simulation results show that the neural network based on the activated sludge system model has good convergence and prediction accuracy, and can meet the control sewage treatment system reliable and stable operation of the engineering application demand.
Facile Synthesis of TiO2 Hollow Spheres with Enhanced Photocatalytic Activity
Authors: Lv Yu Zhen , Wang Wei , Zhang Sheng Nan , Zhou You , Li Cheng Rong
Published: March 2013

TiO2 hollow spheres were synthesized through a facile bubble-template hydrothermal method. Microscopic and diffraction data indicated that the well-crystallized rutile-phase product was composed of self-assembly nanorods with an average diameter of 35 nm. The as-grown product showed high photocatalytic activities in degradation of organic pollutants such as rhodamine B under UV irradiation. It was found that almost all rhodamine B can be decomposed after only 30 minutes of UV irradiation. The enhanced photocatalytic performances were probably attributed to the structure of TiO2 hierarchical hollow spheres, which supplied higher specific surface area and faster electron transport.
Simulation Research on the Metal Cutting Process
Authors: Lei Cheng , Xiao Shou Ne , Luo Shi Hui
Published: March 2013

The three-dimensional explicit dynamic analysis of metal cutting process is done using the non- linear finite element software LS-DYNA. In the finite element model, 8- node 3D solid element based on one- point integration Lagrangian formulation is adopted, metal material is modeled with Johnson-Cook constitutive model, chip separation is simulated using the material failure criterion of Johnson and Cook proposed and combing the failure element deletion method, friction model of chip-tool contact interface is developed to simultaneously account for sticking and sliding situation. Through explicit analysis, rake angle, cutting depth, and cutting width on the shape of the chip influence are obtained.
Ecological Materials in the Construction of Expression
Authors: Zhang Huan , Gao Yu Guo
Published: March 2013

In this paper, by analysizing relevant theory and properties of ecological building materials, eco-materials in architectural design strategy, for example, the practical application of the material in the Expo building which can explore the intrinsic link between ecological materials, architectural design and environmental resources.
Compensation Method Research on Plate Mill’s Stiffness Difference
Authors: He Chun Yu , Jiao Zhi Jie , Wang Xue Jun , Zhang Hong
Published: March 2013

Aiming at the camber problem caused by plate mill’s stiffness difference, this paper put forwards an online compensation method for plate mill’s stiffness difference. Based on the detective actual rolling force in the rolling process, calculate the spring of plate mill’s driving side and non-driving side to get the gap compensation value of plate mill’s stiffness difference. Via plate mill AGC system adjust the two sides’ gap difference online, eliminate additional spring caused by plate mill’s stiffness difference. Online algorithm of plate mill’s stiffness difference embeds in basic automation directly. With the going on of rolling process, update the compensation values constantly according to the changes of rolling force in order to increase the stability and decrease plate camber in the rolling process.
Experimental Investigations of Cutting Parameters Influence on Cutting Forces and Surface Roughness of Quartz Glass
Authors: Liang Gui Qiang , Zhao Fei Fei
Published: March 2013

Abstract In the present study, an attempt has been made to investigate the effect of cutting parameters (cutting speed, feed rate and depth of cut) on cutting forces (feed force, thrust force and cutting force) and surface roughness in milling of Quartz glas using diamond wheel. The cutting process in the up-cut milling of glass is discussed and the cutting force measured. The cutting force gradually increases with the cutter rotation at the beginning of the cut, and oscillates about a constant mean value after a certain undeformed chip thickness. The results show that cutting forces and surface roughness do not vary much with experimental cutting speed in the range of 55–93 m/min. The suggested models of cutting forces and surface roughness and adequately map within the limits of the cutting parameters considered.
Modification of Well-Aligned Carbon Nanotubes Grown on AAO Template by Chemical Vapor Depostion
Authors: Chen Lei Shan
Published: March 2013

Well-aligned carbon nanotubes were synthesized in a horizontal furnace using acetylene as the carbon source and argon as the carrier gas through by AAO templates. To cut the upper parts of CNTs out of the template, the temperature of the furnace was first cooled to 350 °C under an argon atmosphere, and the temperature of 350 °C was remained for 5 min under an air atmosphere, then the furnace was cooled to room temperature in air. The as-prepared aligned CNTs were also carefully scratched from the substrate and some of them were placed on a copper grid for high resolution transmission electron microscopy (HRTEM) observations. The morphology of CNTs was examined by scanning electron microscopy (SEM). The results show that well-aligned carbon nanotubes were obtained and the carbon nanotubes on the surface of AAO templates were cut off successfully.
Flexural-Torsional Buckling Analysis of Steel Beams under Transverse Loads in High Temperature
Authors: Wang Zhen Qing , Li Jia Lei , Han Yu Lai , Ju Zhu
Published: March 2013

Flexural-torsional buckling of steel beams in high temperature is studied by adopting the method of theoretical analysis. The flexural-torsional buckling critical moment equations of steel beams under concentrated transverse loads are driven in high temperature ranging from 20°C to 300°C. In order to verify the validity of the theoretical analysis equations, a steel beam model under concentrated transverse load is designed. The flexural-torsional buckling critical moments and critical stresses are calculated under different temperature conditions. The influence of load point on flexural-torsional buckling critical moment and critical stress are obtained. The variation tendency of flexural-torsional buckling critical moment and critical stress against temperature are also presented.
Prediction of Detonation Pressure of Aluminized Explosive by Artificial Neural Network
Authors: Liu Yong Gang , Tian Xin , Jiang Yue Qiang , Li Gong Bing , Li Yi Zhou
Published: March 2013

In this study, a three-layer artificial neural network(ANN) model was constructed to predict the detonation pressure of aluminized explosive. Elemental composition and loading density were employed as input descriptors and detonation pressure was used as output. The dataset of 41 aluminized explosives was randomly divided into a training set (30) and a prediction set (11). After optimized by adjusting various parameters, the optimal condition of the neural network was obtained. Simulated with the final optimum neural network [6–9–1], calculated detonation pressures show good agreement with experimental results. It is shown here that ANN is able to produce accurate predictions of the detonation pressure of aluminized explosive.
Preparation and Properties Investigation of Active High Temperature Resistant Insulation Material
Authors: Tang Wen Long , Tian Chun Rong , Jia Xiao Rong , Chen Gui Sheng
Published: March 2013

The active high temperature resistant insulation material is devised to fulfill the specified requirements of the packing material. The complex material K2O.6TiO2 whisker/expanded perlite/resol was prepared in 20mm thickness, its back temperature was stable below 180°C in fire test with its front surface burned by the fire at 950°C—1050°C, but its compressive strength was 4.22MPa and its impact strength was just 0.43 kj/m2 Whereas the back temperature of the complex material Al2(SiO3)3 fiber/resol was stable below 140°C under the same test condition and its density and physical strength can be control. the compressive strength of the complex material Al2(SiO3)3 fiber/resol was between 5.0MPa and 30.0MPa versus the density between 0.75g/cm3 and 1.05g/cm3 while its impact strength was hardly influenced by the density. The thermal coefficient of the material through the fire test became lower. The analysis of its structure and thermal behavior show the complex material prepared possesses the function of active high temperature resistant insulation.
Controlled Synthesis of Carbon Spheres Using Iron Catalyst Supported on Aluminum Hydroxide
Authors: Chen Lei Shan
Published: March 2013

Carbon spheres were synthesized by chemical vapor deposition using iron catalyst supported on aluminum hydroxide, in the presence of acetylene as the carbon source. The effects of catalyst on the diameters of carbon spheres were investigated in detail. The products were characterized by field-emission scanning electron microscopy, element analysis, high resolution transmission electron microscope. The results show that the carbon spheres, to some degree, can be controlled by the catalyst
Study on Film Formability of Thermosetting Phenolic Resin Film
Authors: Chen Li Xin , Zhang Hong Xiang , Zhao Hui Xin
Published: March 2013

A novel modified thermosetting phenolic resin was synthesized by bulk polymerization. The main process of the phenolic resin film formation was studied by tensile shear test. The preparation technology was determined by the investigation of viscosity behavior, gel properties and the data of DSC. The flexible rolled resin film was manufactured at 100±3°C while the moving speed of release paper is at 2 m/min on hot melt machine made in California Graphite Machines Inc. USA. The area weight of the film is 400±20 g/m2, the width of that is 300 mm and the thickness of that is 0.32±0.04 mm.
The Study of the MnOx/TiO2-ZrO2 Used in the Sintering Flue Gas Low-Temperature Selective Catalytic Reaction
Authors: Lu Xi Ning , Song Cun Yi
Published: March 2013

TiO2, 50%TiO2-ZrO2 and 80%TiO2-ZrO2 were prepared by sol-gel method. The manganese oxides were impregnated on the carrier and the catalysts were used for low-temperature selective catalytic reduction of NOx with ammonia (NH3-SCR) in the presence of excess O2. The samples were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The results showed that the particle size of 80%TiO2-ZrO2 is the smallest among the three kind of carrier and the particles are highly dispersed. By adding the ZrO2, the Zr4+ ions replaced the lattice Ti4+ ions, and thus caused lattice distortion in the TiO2 and an increase of the active point amount on the carrier. Furthermore, the Zr also promoted the dispersion of the active ingredients carried on the carrier, increased the surface concentration of Mn. The most active catalyst was obtained with a mass MnOx/80%TiO2-ZrO2 ratio of 0.1.The best MnOx/80%TiO2-ZrO2 catalyst yielded nearly 92.6% NO conversion at 130°C at a high space velocity of 67,000 h-1.
Fabrication of Graphene/Carbon Nanotube Composite Modified Electrode for Selective and Sensitive Determination of Uric Acid
Authors: Liu Zheng Xiao , Xia Jian Fei , Wang Zong Hua , Xia Yan Zhi , Zhang Fei Fei , Xia Lin Hua
Published: March 2013

A novel composite was firstly synthesized by compositing graphenes (G) and carbon nanotubes (CNTs) and then a new composite modified electrode (G/CNTs/GCE) was prepared by coating the resulting composite on the surface of the glassy carbon electrode (GCE). The composite modified electrode G/CNTs/GCE showed great electrochemical activities which were studied by sensitive determining the electrochemistry behaviors of uric acid (UA). It revealed when the concentration range of UA changed from 1×10-7 mol/L to 1×10-3 mol/L, the peak currents had linear relationship with the concentration of UA in the phosphate buffer solution (PBS) which the value of pH is 7.0. And the linear equation is ip (μA) = 21.55C+28.94 (C: mmol/L), with the related coefficient 0.9964.
Characterization of Codon Usage Bias in the UL17 Gene of Duck Enteritis Virus
Authors: Wen Ting , Cheng An Chun , Wang Ming Shu
Published: March 2013

The analysis on codon usage bias of UL17 gene of duck enteritis virus (DEV) may provide a basis for understanding the relevant mechanism for its biased usage of synonymous codons and for selecting appropriate host expression systems to improve the expression of DEV UL17 gene. In this study the results indicate that codon usage bias of DEV UL17 gene strongly preferred to the synonymous with A and T at third codon position. The ENC values and GC3S contents of the codon usage bias of UL17 genes in DEV and the 20 reference herpesviruses were obviously different. In addition, we compared the codon usage bias of DEV UL17 gene with E.coli, yeast and human. There are 25 codons showing distinct usage differences between DEV and E. coli, 17 codons between DEV and yeast, 23 codons between DEV and human. Therefore, the yeast expression system is more suitable for heterologous expression of the DEV UL17 gene.
Characterization of Synonymous Codon Usage Bias in the Riemerella Anatipestifer Major Facilitator Superfamily Mfs_1 Gene Encoded 492 Amino Acids Protein
Authors: Zhang Xin , Cheng An Chun , Wang Ming Shu , Zhu De Kang , Wang Xiao Jia , Jia Ren Yong , He Yang
Published: March 2013

Objective: The aim was to identify the codon usage bias between the newly identified Riemerella anatipestifer (RA) major facilitator superfamily mfs_1 gene (GenBank accession No.CP003388.1) and other reference bacteriums. Methods: A comparative analysis of the codon usage bias of the 18 bacteriums was performed by using the CodonW 1.4 program and CUSP (create a codon usage table) program of EMBOSS (The European Molecular Biology Open Software Suite). Results: The results showed obvious differences of the synonymous codon usage bias in the 18 bacteriums indicated by the Codon Adaptation Index (CAI), effective number of codons (ENc), and the value of G+C content at the 3rd codon position. The codon usage pattern of the major facilitator superfamily mfs_1 gene was phylogenetically conserved and similar to that of the major facilitator superfamily mfs_1 gene of the Elizabethkingia anophelis Ag1 Contig17, with a strong bias towards the codons with A and T at the 3rd codon position. A cluster analysis of codon usage pattern of the RA major facilitator superfamily mfs_1 gene with other reference bacteriums demonstrated that the codon usage bias of the major facilitator superfamily mfs_1 genes of the 18 bacteriums had a very close relation with their gene function. The ENc-plot revealed that the genetic heterogeneity in the RA major facilitator superfamily mfs_1 gene and the 18 reference bacteriums were constrained by G+C content, while gene length exerted relatively weaker influences. In addition, comparisons of the codon preferences in the major facilitator superfamily mfs_1 gene of RA with those of Escherichia coli, yeast and humans revealed that there were 36 codons showing distinct usage differences between the RA and E. coli, and 37 between the RA and humans, but only 28 between the RA and yeast. Therefore, the yeast system may be more suitable for the expression of the RA major facilitator superfamily mfs_1 gene. Conclusion: Together, these results may improve our understanding of the evolution, pathogenesis and functional studies of RA and possibly contribute significantly to the area of other bacteriums.
Synthesis of 1,1-Bis(hydroxymethyl)cyclopropane as Intermediate for Montelukast Sodium
Authors: Li Shu An , Li Run Lai , Zhang Zhen Ming , Ye Sheng , Wang Guo Cheng , Liu Hang Hang
Published: March 2013

1,1-Bis(hydroxymethyl)cyclopropane was synthesized by reaction dibromoneopentyl glycol with zinc powder at mole ratio of nDG:nzinc=1:1.05 and 80oC (slightly reflux) for 7 hours. Under optimal conditions, yield and purity of the title compound were 87.3% and 98.67%, respectively. Dibromoneopentyl glycol was also prepared in 91.7% yield with pentaerythritol and hydrobromic acid as material and diethyl sulfate as catalyst under reflux for 10 hours. Structural characterization of 1,1-bis(hydroxymethyl)cyclopropane was conducted by IR and H-NMR.