bluuebunny/crossref_metadata_2025 huggingface dataset:
Wind Load Characteristics of Tall Building with Atrium
Authors: Li Yong Gui , Li Q.S.
Published: March 2013

Wind tunnel test of 1:500 rigid model of tall building with atrium was carried out. Based on the experimental results, characteristics of wind pressures on atrium facades and wind loads on the structure were investigated in detail. The results show that the formation of flow separation on the building top plays a critical role in the generation of wind pressures on the atrium facades. Meanwhile, wind pressure coefficient distributions on the atrium facades are found to be relatively uniform. Moreover, the horizontal and vertical correlations of pressure coefficient exhibit high at most locations on atrium facades. With the increasing of the opening ratio, the mean wind pressure coefficients first decreased and then stabilized, and the fluctuating wind pressure coefficients first decreased and then increased. A design guideline for the wind-resistant design of atrium facades was proposed, and the results predicted by the proposed guideline were in good agreement with those from the wind tunnel tests, indicating that the proposed guideline can be used in engineering applications. When the opening ratio is no more than 5.33%, the effect of the facade pressures within the atrium on the wind loads on the structure can be ignored. For such cases, the wind-resistant design for a tall building with atrium can refer to that of a similar shape tall building without atrium.
Characteristics of Wind Loads Acting on Complex Long-Span Roof Structure
Authors: Chen Fu Bin , Li Q.S.
Published: March 2013

The Shenzhen New Railway Station (SNRS) has roof dimensions of 450 m long and 408 m wide. This paper presents the results of wind loads acting on the large-span roof structure. In the wind tunnel test, wind-induced pressures including mean and fluctuating components were measured from the roof of a 1:200 scale SNRS model under suburban boundary layer wind flow configuration in a boundary layer wind tunnel of HD-2 at Hunan University. Based on the data obtained simultaneously from the wind tunnel tests, the distributions of the mean and fluctuating wind pressure coefficients and the characteristics of probability density functions of wind pressures of typical pressure taps were analyzed in detailed. The outcomes of the experimental study indicate that: (1) The maximum mean negative wind pressure coefficients on the roof occur at the windward leading edge region, where the maximum fluctuating wind pressure coefficients occur also in this region; (2) There are some differences of the maximum mean negative wind pressure coefficients and RMS wind pressure coefficients under conditions with different number of trains inside the station, but such effects on the overall pressure distributions on the whole roof are negligible; (3) There are clearly negative skewed distributions for some pressure taps at the windward leading roof edge and much longer negative tails are observed, which follow Non-Gaussian distributions. The results presented in this paper are expected to be of considerable interest and of use to researchers and professionals involved in designing complex long-span roof structures.
The Spatial Analysis of Lateral Bending on 40-m Prestressed Concrete T-Beam
Authors: Chen Jian Ying , He Guo Jing , Tang Hua
Published: March 2013

For the reasons of prestressing and other factors, the lateral bending would appear on the post-tensioned concrete T-beam during the pre-tensioning. In this paper, a simulation model is established as an example of the edge beam of 40-m T-beam which is widely used. According to the stress and displacement of main girder under different orthogonal force, the effects of lateral bending on the main girder are analyzed. Finally, some guidelines are suggested.
Research on the Traveling Wave Effect of a Rigid-Continuous Girder Bridge with High Piers Based on Multi-Support Excitation
Authors: Lei Hu Jun , Li Xiao Zhen , Zhu Yan
Published: March 2013

This paper, aiming at rigid-continuous girder bridge with high piers, uses the large mass method (LMM) to analyze the seismic response of such special structure under a series of different phase differences by considering both rigid foundation and elastic foundation models. In addition, this paper discusses the influence rules for extreme response of different parts of structure due to traveling wave effect. The result shows that traveling wave effect greatly affects the rigid-continuous girder bridge with high piers. When considering the traveling wave effect, the internal force of bridge piers presents increasing trend, and the displacement of pier top reduces with increasing phase differences. The internal force and extreme displacement response of bridge structure present cyclical variations with phase differences, and that cycle is consistent with the characteristic period of bridge.
The Research of Dynamic Characteristic for Box-Girder Bridge with Corrugated Webs
Authors: He Guo Jing , Xie Lan
Published: March 2013

Dynamic performance of prestressed concrete bridge of box girder with corrugated steel webs has been researched in this paper. First, the analysis theory and methods were discussed. Then, the finite model on the background of Li- Jia River bridge is built to analyse the dynamic characteristics. On the basis of original model, the geometric parameters are changed to analyse the change rule of dynamic characteristic. Finally, the range of optimum parameters are abtained.
Study on the Constitutive Model of Visco-Elasticity-Plasticity Considering the Rheology of Rock Mass
Authors: Wu Li , Zuo Qing Jun , Lu Zhong Le
Published: March 2013

Considering the rheological mechanical characteristics of rock mass, a viscous-plastic model of rock mass which can describe the acceleration creep stage of rock mass was proposed. Moreover, combining with viscous-elastic shearing rheological model of rock mass in series, a new constitutive model of visco-elasticity-plasticity considering the rheology was constructed. Due to the shearing rheological curves of granite, the model of visco-elasticity-plasticity considering the rheology was identified and the rheological parameters of the model were obtained. The comparison between the viscous-elastic-plastic rheological model of rock mass and experimental result of granite shows that the accelerating rheological properties of rock mass can be depicted effectively by the constitutive model of visco-elasticity-plasticity considering the rheology.
An Improved Shearing Displacement Law for Analyzing Pile-Soil Interaction
Authors: Jiang Xue Liang , Yang Hui , Fu Jun
Published: March 2013

The Soil Improved shearing displacement law is used to analyze Pile-soil interaction and this method can consider stratified foundation, but can’t consider pile-soil slip. An improved shearing displacement law analyzing pile-soil interaction was proposed in this article which could think over pile-soil slip on interfaces and interaction of pile-soil on stratified foundation. Rock and soil’s parameter is very crucial in geological engineering, the soil parameters were determined by parameter back analysis theory and the stress and deformation characteristic for vertical loading piles were analyzed by the improved shearing displaces law. These process was simulated by my own program. The calculation results show that the axial force of pile decreases with pile depth and the pile tip axial force is zero. The pile bottom resistance increases with load and the soil’s resistance increases with the relative displacement between pile and soil. But,the frictional resistance growth rate with displacement is different in different soil. The silt’s growth rate is minimum and the medium-fine sand mixed mucky soil is maximum. The pile frictional resistance increases with load and depth. It has greater directive significance for the pile design.
New Approach to Treat Broken Pile in Cast-In Site Bored Pile
Authors: Wang Guang Hui , Wei Cheng Long
Published: March 2013

Many cast-in-site bore pile have broken pile because of collapsing in wall of holl. Based on the principle of mechanics, a new combination approach was proposed for dealing with the broken pile. The approach is displacing the soil in the pile by cement paste and increasing the height and the steal ratio of the top beam which is on the defect pile. Using the finite element software, we have set up the analysis model of the approach, which helps to demonstrate the rationality of this method. This method can be referenced by the reinforcement and maintenance of the bridges.
The Mechanical Property of High Bridge Pier
Authors: Liu Hai Tao
Published: March 2013

As for those high piers of bridge that constructed crossing sea and clough, the p-delta effect is evident; Looking upon present situation over the domestic and foreign research, stipulated laws on p-delta effect are various. Research shows that computing upper pier displacement by energy method was simple and versatile for different load case in comparing with other methods, and neglecting p-delta effect often underestimated the disadvantageous state when the pier is high; also, lateral loads like wind and seismic force further aggravate the pier state.
Study on Compressive Performance of Prefabricated Wall Components in Bamboo and Wood
Authors: Chen Shun Liang , Ouyang Yang , Lin Qiao
Published: March 2013

According to the design proposal of prefabricated bamboo composite wall components that with the functions of heat preservation, heat insulation, heat conduction and energy accumulation, a method to calculate the effective area of the component’s cross section is proposed in this paper. The prototype compressive tests of prefabricated bamboo composite wall components have been carried out using large scale test loading devices. The test results show that after adding the movement joint of the plywood outside the component, the compression strength has increased 39% due to circular bamboo, wood border and panel in the component have reached a common strength bearing state, therefore optimize the design proposal.
Studies on Mechanical Properties of Diamond Bird-Beak XX-Joint
Authors: Liu Sheng Liang , Zhu Zhao Quan , Dong Xian
Published: March 2013

The diamond bird-beak XX-joint is a novel configuration for tubular structures and there are few correlated papers for it. Non-linear FE analyses are carried out on axially loaded XX-joints in order to study the mechanical properties of this type of joint. The individual influence of the following geometric parameters on the joint capacity, brace to chord width ratioβ, chord width to wall thickness ratio 2γ, and brace to chord thickness ratioτis made clear. Increasing eitherβorτwill increase the joint capacity and increasing 2γwill decreases joint capacity. The out-of-plane braces tension always decreases the ultimate capacity of joint and the equal tension and compression in the chord member have the same influence on the joint capacity. A reduction equation is proposed to consider the load effect of chord and out-of-plane braces axial forces.
Mechanical Performance Analysis of Steel Beam-Concrete Wall Rigid Joint
Authors: Qin Yin Hui , Liu Wen Ji , Zhou Chao Yang , Liu Fu Hua
Published: March 2013

The beam-column joints play a key role in composite steel and concrete structures. In order to ensure a safe design of a new building and obtain optimum design, an experimental program consisting of the tests of three connections with different connection details under low-cyclic reversed loading, A series of mechanical performance such as the stress-strain relationship of steel beam web, beam flange, connecting plate, bracket web, bracket flange, distributing steel, concealed column in node core area are all analyzed, the results show that in the loading process, steel beam flange and web ,bracket flange produced yield deformation, but the bracket web, distributing steel, concealed column didn’t yield, so the steel beam flange and web, bracket flange must be strengthened in the design. The test results also show that the bracket can be regarded as canlitecver model in practical engineering.
New Isolation Technology of Rural Buildings
Authors: Shang Shou Ping , Zhu Bo Wen , Wen Xue Zhang
Published: March 2013

China is a large agricultural nation where most of the population and national economy is concentrated in rural areas. At the meantime, our country is a seismic country where earthquakes frequently take place. The earthquake disaster of Wenchuan in 2008 seemed that it always cost a great damage in rural areas. According to the present situation, a new type of seismic practical technology called steel-asphalt composite isolation lay is put forward with the characteristics of economic, simple and reliable. In order to test the effect of the new isolation layer, we have built a new house in use of the isolation layer nearby the rural areas in Changsha, beside the shaking table experiment in laboratory. The practical engineering in masonry structure has three floors and a basement. After the structure of the house had been finished, we tested the isolation effectiveness of the house. The results showed that the isolation layer can decay the acceleration about 40% and the isolation effectiveness is very well. Therefore, the seismic grade of the super structure can be reduced. So we took use of the High Performance Ferrocement Laminate as the ring beam and constructional column instead of the reinforced concrete. The cost of the upper structure can be reduced. And the money can be taken used on the building of the isolation layer. Therefore the whole cost of the structure didn’t increased.
Dynamic Stability and Ultimate Capacity of Suspended Dome under Earthquakes
Authors: Li Yong Mei , Hu Kun , Zhang Wei Jing
Published: March 2013

Suspended dome is a reasonable and novel type of long-span hybrid spatial structures based upon single-layer spherical lattice shell and tensegrity system. Based upon the structural force-bearing characteristics, the combined finite element model of beam elements, truss elements and cable elements is set up. A method taking the maximum displacement on nodes under earthquake acceleration of each level as dynamic response representative parameter is proposed to study the dynamic stable ultimate capacity of suspended dome by application of the incremental dynamic analysis in combination with B-R kinetic criterion. Furthermore, considering suspended dome has the clear advantage over Single-Layer Spherical Lattice Shell for a structure with a long span and a small ratio of rise to span, the influences of factors such as structural parameters, geometric parameters, and different earthquake input are investigated on dynamic stability for a kiewitt-type suspended dome with a long span and a small ratio of rise to span. Finally of suspended dome some conclusions are obtained such as the initial defects can clearly reduce dynamic stable ultimate capacity, and since the rise-span ratio, pre-stressing level and cross section area are not monotonous as variety to the structural dynamic stability, they should be optimized to enhance or improve the structural dynamic stability, which can be rules for engineering design.
In Situ Experimental Study of Environmental Vibration Induced by CRH on Elevated Railway Station
Authors: Liu Quan Min , Zhang Xun , Zhang Zhi Jun , Li Xiao Zhen
Published: March 2013

On the basis of testing the environmental vibration of the different regions of the elevated station, this paper analyzed the experimental data by the time domain, the vibration acceleration level and spectrum, and some meaningful conclusions are obtained. The vertical Z weighted vibration acceleration level of the office and waiting room achieve 80.7dB, 78.8dB, indicating a serious vibration problem about elevated station, and that some more attention should be paid. Office has an equivalent transverse and longitudinal vibration level; the vertical vibration of the office is slightly larger than the waiting room, but the lateral vibration of the office is obviously lower than the waiting room. The exposure time of the vertical vibration is longer than the horizontal vibration in the same location, and a phase difference exists between them. Lateral vibration of the first floor of the station holds a longer exposure time than the box girder, and has lagged far behind in the box girder. The vertical vibration attenuated slower than the horizontal vibration. The high-frequency vibration is attenuated in the propagation from the box girder to the station floor, while the proportion of low-frequency vibration is improved.
Research on Anti Collision Scheme of Main Pier of Chongqing Huanghuayuan Jialing River Bridge
Authors: Geng Bo , Zhang Xi
Published: March 2013

On the basis of summing up the characteristics of water level and the channel where the bridge is located of Huanghuayuan Jialing River Bridge of Chongqing City, the risk of ship collision and structural characteristics were analyzed with the advanced risk analysis methods of AASHTO method and integral path methods with three probability parameters. The pier protection measures raised on this basis include that P1 pier is designed with anti collision pier and in the design of P2 pier, the floating anti collision box programs based on the highest water level and the anti collision pier program are raised and a comparatively studied. These conclusions provide some references for the anti collision design of bridges under similar environments.
Planning Strategies on Disaster Prevention and Reduction for Industry in Mountainous Cities - Taking the Changshou District of Chongqing for Example
Authors: Zhou Jin , Zhao Wan Min
Published: March 2013

The disasters in mountainous cities are serious and special, which have wide distribution range and whose relative factors are fuzzy and complicated. So, in mountainous industrial cities it should pay more attention to prevent and reduce disasters especially. The article takes mountainous city Changshou District of Chongqing as an example, which is also the typical heavy chemical industrial city, to discuss the planning strategies of preventing and reducing disasters for heavy chemical industrial city in the complex mountainous topographical conditions.
Engineered Wood in Cold Climate - Application to Monitoring of a New Swedish Suspension Bridge
Authors: Wang Xiao Dong , Hagman Olle , Björngrim Niclas , Elfgren Lennart
Published: March 2013

Engineered wood is increasingly used in large structures in Europe, though little is known of its behavior in cold climate. This paper presents the structural health monitoring (SHM) system of a newly built suspension bridge with a deck of glulam timber as well as a bond stability study regarding cold climate performance of engineered wood. The bridge is located in Skellefteå in northern Sweden, and it connects two parts of the city situated on opposite shores of the Skellefteå river. In this ongoing study of the timber-bridge, a structural health monitoring system is employed to verify structural design and long-term performance. This 130m-span bridge is monitored using GNSS receivers, MEMS accelerometers, laser positioning systems, wireless moisture content sensors, strain gauges and weather stations. Data from the monitoring systems is analyzed regarding accuracy, complexity, costs and reliability for long time use. Engineered wood application in bridges, sports centers and timber buildings are discussed. Bond stability of glulam structures in cold climate is also examined in a range of experiments ranging from small glued wood joints to full size glulam bridge performance over time. From an engineered wood material point of view, the study is relevant to cold regions such as Scandinavia, Canada, Alaska, Russia, and the northern parts of China and Japan etc. The engineered wood constructions in these areas will be exposed to low temperature in a quite long period each year. The goal is to determine how engineered wood behaves when exposed to temperatures between 20 °C to -60 °C.
Blasting Excavation and Vibration Monitoring Design for Diversion Tunnel
Authors: Hu Qi Gao , Cui Wei Feng , Gao Jing Wei , Zhao Fei Wei , Liang Qian Fu
Published: March 2013

Because of the local crack and seepage, a double curvature arch dam of concrete block in Jiangxi Province was urgently needed to strengthen, and the construction period was limited seriously. In order to solve the problem of drainage, a diversion tunnel about 24m must get throng in two weeks, and it is proved that the blasting excavation scheme is the only choice. Meanwhile, monitoring measurement must be taken to ensure the dam’s safety. In this article, the optimization design of blasting excavation and a vibration monitoring are completed and carried out respectively. Theoretical calculations and monitoring results showed that, those design schemes are scientific and rational, and disadvantageous effect of blasting vibration is under the control fully.
Reusing Waste Oyster Shells in Polypropylene and its Performances
Authors: Yang Nai De , Liu Xi Xv , Wang Gui , Zhao Juan
Published: March 2013

his work presents a new cost-effective filler for polypropylene (PP) by the use of oyster-shell waste. Characteristics of oyster shell particle prepared by supersonic jet mill were investigated. Microstructure analyses demonstrated that the average particle size of as-recived oyster shell particle was mainly around 3um, and the particles were non-uniform in size and irregular in shape. To improve both the mechanical of oyster shell /polypropylene (PP) composites, oyster shell was modified by using titanate coupling agent to form polymerizable particle. While the modified oyster shell and raw oyster shell were introduced into the PP matrix, it could be concluded that modified oyster shell /PP composites have better mechanical than raw oyster shell /PP composites and neat PP.
The Study in the Toxic Effects of the Material Bisphenol A at Long Time Exposure
Authors: Duan Zheng Hua , Wang Hua , Zhang Xiao Hao , Li Ning Tao
Published: March 2013

Bisphenol a (BPA), is a chemical that has been used for more than 40 years in the manufacture of many hard plastic food containers such as baby bottles and reusable cups and the lining of metal food and beverage cans, including canned liquid infant formula. Therefore, it is very necessary to study its health risk and ecological risk. In this paper, four typical estrogen acceptor genes (AHR1, ESR1, VTG1 and VTG3) in female zebrafish liver were studied to assess the low dose and chronic effects of bisphenol A (BPA), with the method of quantitative real-time RT-PCR, and the ability of self regulation and repair of these genes were also discussed. The results showed that these genes could be induced even at 15 ug/L BPA, and VTG 3 was the most sensitive gene. VTG 3 and VTG 1 had obvious self repair and adjustment ability when BPA risk was removed. No monotonic dose-effect relationships of BPA were also found at this study.
Theoretical Study of the 1CF2 + 3O2 Reaction on the Singlet Potential Surface
Authors: Shi Cong Yun , Yu Jia Dong , Liu Xing Zhong , Yang Yan , Wu Lin , Li De Bing , Lou Fei , Yang Meng Cheng , Chen Wen Jing , Zhou Ying
Published: March 2013

A detailed singlet potential energy surface survey on the 1CF2 + 3O2 reaction is carried out in order to clarify the reaction mechanisms of the singlet difluorocarbene (1CF2) with oxygen (3O2) at the B3LYP/6-311++G(d,p) level. To determine the accurate energies of all stationary points, the QCISD/6-311++G(d,p) single-point calculations are done by using the B3LYP/6-311++G(d,p) optimized geometric structures. The title reaction is important in high temperature processes. Four product channels, P1(F2 + CO2), P2(F2O + CO), P3(2F + CO2) and P4(FCO + FO), have been found in the 1CF2 + 3O2 reaction. P1(F2 + CO2) and P3(2F + CO2) have comparable contributions to the title reaction and they are more favorable than the other two thermodynamically and kinetically.
Research on Influence Factors of Heavy Oil-Contaminated Soil Remediation by Fenton Oxidation
Authors: Dong Ya Ming , Meng Yu Hua , Li Lin , Liu Qi You , Zhao Chao Cheng
Published: March 2013

In this paper, Fenton oxidation technology was used for oxidation treatment of soil contaminated by heavy oil, and environmental conditions were investigated for improving the effect of Fenton oxidation. The results showed that under the direct sunlight, liquid to soil was 2:1, pH was 5, 10.0mL 18 mmol•L-1 Fe2+ and 10.0mL 30%H2O2 were added to 1000g soil contaminated by heavy oil which contained 8% petroleum hydrocarbons, the petroleum hydrocarbons reduced from 5.74% to 2.92%.
Response of Antioxidant System in Leaves of Ginkgo biloba to Elevated CO2 and/or O3 and its Natural Recovery in an Urban Area
Authors: Gao Jiang Yan , Xu Sheng , Chen Wei , He Xing Yuan
Published: March 2013

Changes of oxidative stress and antioxidant system were studied in leaves of Ginkgo biloba exposed to elevated CO2 and O3 fumigation (2006-2008), and released the gases fumigation for the natural recovery in open-top chambers (OTCs) during the growing season in 2009. Elevated CO2 had no significant effect on hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents, and the activities of antioxidant enzymes in leaves of G. biloba during the gas fumigation in 2008. Elevated O3 increased significantly H2O2 and MDA contents, especially after 90 days of gas fumigation. The adverse effect or damage of elevated O3 on trees during the gas fumigation was also alleviated by the released-O3 exposure during the natural recovery. The antioxidative enzyme including superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activities showed higher levels under the natural recovery than under the gas fumigation, which may be a helpful response to scavenging reactive oxygen species (ROS). The results also indicated that future alleviating the emissions of CO2 and O3 would differentially affect the antioxidant system in plants.
Nitrous Oxide Emissions from a Subtropical Agricultural Field
Authors: Liu Hui
Published: March 2013

N2O emissions have been increasing in recent years due to intensive agricultural practices. This study was conducted to evaluate N2O emissions from a subtropical paddy field of south China with closed static chamber and a gas chromatograph in situ in the second crop season. Gas samples were taken simultaneously from rice-involved and rice-free plots. It showed that diurnal variation of N2O emission was more regular at the booting stage. The diurnal mean N2O flux of rice-involved plot was higher than that of rice-free plot during flooding time but lower during the drying time. It showed no significant correlation between N2O flux and temperature. The N2O flux was affected by soil water regime. Rice paddy field in growing season is a N2O source to atmosphere.
Assessment of Heavy Metal Contamination in Sediments along the Jiangsu Lagoon
Authors: Han Zhao Xiang , Zhu Zhen , Wu Dan Dan
Published: March 2013

Abstract: In this study we have worked on the evaluation of heavy metal contamination in the sediments taken from the Jiangsu lagoon and thereby used the Enrichment factor (EF), Pollution load index (PLI), Geoaccumulation index (Igeo), Potential ecological risk index (PERI), Potential ecological risk index (PERI), Potential toxicity response index (PTRI) and Risk assessment code (RAC) and the methods of statistical analysis. The average EF of Zn is found to be less than 2, and the average EF of Cu, Cr, Cd, Pb and Ni are found to be greater than 2 in Jiangsu lagoon.The EF for Pb, Cd and Cr are higher along the Jiangsu lagoon and harbor, which reveals the anthropogenic contribution to the increased content of the surface sediments of the Jiangsu coast. PLI values calculated for Yancheng suggest that this zone is appreciably less impacted by metal pollutants than Nantong. Zn (Igeo(mean)<0), as unpolluted to moderately polluted with Cu (0<Igeo(mean)<1), moderately polluted with Ni (1<Igeo(mean)<2), moderate to strongly polluted with Cd (2<Igeo(mean)<3), and strongly polluted with Cr and Pb (3<Igeo(mean)<4). The potential ecological risk indices of Cu, Zn and Ni in 9 stations in Lianyungang coast were lower than 40, which indicated slight potential ecological risk of three metals in 9 stations.Potential ecological risk indices of Cu, Zn and Cd in 9 stations in Yancheng lagoon were lower than 40, which indicated slight potential ecological risk of two metals in 9 stations. The sediments show a medium risk for Cu with PERI value greater than 40 indicating a moderate risk from sediments across the entire Nantong region. The amount of Cu and Ni with low risk, while Cd with moderate, with high risk in Lianyungang coast. Cu, Zn and Cd with low risk, while Cr and Ni with moderate risk, but, the Pb with very high risk in Yancheng coast. Cu and Zn with low risk, Cr and Ni with medium risk, Pb,Cd with high risk in Nantong coast.
A Study on the Photocatalytic Degradation of Organophosphorous Pesticide Wastewater by the New Photocatalyst AgBr/TiO2
Authors: Xu Xue Li , Song Wei , Zhang Li
Published: March 2013

In the experiment a new photocatalyst AgBr/TiO2 was prepared by modifying TiO2 and was applied to degrade the organophosphorous pesticide wastewater . Some factors influencing the degradation were discussed. The results showed that the AgBr/TiO2 had higher photocatalytic activity; when the quality of photocatalyst was 1.2g, the initial concentration of the organophosphorous pesticide wastewater was 100mg/L, the PH was 11 and the degradation time was 100 minutes,the treatment effect of photocatalytic degradating organophosphorous pesticide wastewater was the best.
A Rapid and Sensitive Ether Sensor Utilizing Thermal Desorption Coupled with Cataluminescence
Authors: Cui Zhi Gang , Zhang Shao Tong , Zhao Jin , Zhou Kao Wen
Published: March 2013

A rapid and sensitive cataluminescence (CTL)-based gas sensor using nanosized Y2Zr1.5O6 as a probe was proposed for direct determination of ether in air. Trace ether was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 65°C to determine. The sensor showed high selectivity to ether at wavelength of 510nm, satisfying activity at temperature of 310°C and good stability at carrier flow rate of 110 ml/min. The linear range of CTL intensity versus concentration of ether was 2~100 mg/m3, and the detection limit (3σ) was 1.1 mg/m3. The recovery of artificial sample was 95.4%—106.7% by this method. The response to formaldehyde, benzene, NH3 and ethanol was insignificant, and there was no response to SO2, CO and acetone. The technique is a convenient and fast way of determining ether in air.
Effect of Coal Dust on Coalbed Methane Wells Productivity
Authors: Ma Hong Ze
Published: March 2013

CBM has the largest reserve except for conventional natural gas and is the cleanest energy. However, neither coal seam permeability nor CBM vertical well productivity has been determined when the immigration of coal dust are considered, which restricts the economic CBM exploitation. Based on coal seam characteristics, use permeability parallel path model and CBM seepage equation. The results show that with different ratio of non-clogging path and the total path, coal seam permeability and CBM vertical well productivity may either increase or decrease.
Recovery of Molybdenum (VI) from Aqueous Solution with Packed Foam Column by Steady-State
Authors: Zhang Yong Qiang , Wang Jing , Shi Mei Ling , Zhao Xiao Xian
Published: March 2013

The purpose of this study is to recover molybdenum (VI) from aqueous solution with packed foam column by steady-state operation using hexadecyl trimethyl ammonium chloride as the surfactant. The parameters include air and feed flow rate, packing layer heights, surfactant concentration and pH etc, then the macroscopical dynamics is studied. The experimental results show that there are little effects of liquor pH, air flowrate and surfactant concentration on recovery rate and enrichment ratio of molybdenum within experimental conditions, but with increase of feed flow rate, recovery rate and enrichment ratio all decline clearly, with increase of packing height, recovery rate enhances evidently, and enrichment ratio decreases slowly. The macroscopical dynamics show that the process can be regarded as first order reaction. The fluid flow pattern is close to piston, indicating that there is little liquid backmixing and in favor of advancing separation efficiency by analyzing variance and distribution density function.
Comparative Researches on Two Kinds of Staining Method of Acetylcholinesterase Isozymes
Authors: Zhao Gan , Chen Kang Jie , Wu Shao Cong , Zhuang Qin Chuan , Qian Fang
Published: March 2013

The staining effects of two staining methods of acetylcholinesterase isozymes were compared . One using acetylthiocholine iodide , K3[Fe(CN)6] and CuSO4 was named as AFCu method, and the other one using acetylthiocholine iodide , K3[Fe(CN)6] and FeCl3 was named as AFFe method. The staining effect of former was better.
Effect of the Amount of Recycled Materials on Properties and Microstructure of the Al2O3-C Materials
Authors: Wang Jian Zhu , Zhao Jun Xue
Published: March 2013

Abstract. Samples of Al2O3-C materials were prepared, based on the tabular corundum and recycled materials as raw materials, natural graphite as carbon source, Si as antioxidant and phenolic resin as binder. The physical properties were determined and the microstructure evolution in the samples were analyzed by scanning electron microscopy. The results shows that, Firstly the apparent porosity rate change little and the body density decreases much with the amount of recycled materials increasing. Secondly the room temperature strength and the high temperature strength decreases when the amount of recycled materials increases. Especially the strength of sample decreases rapidly when the amount of recycled materials is over 15(wt)%. In addition, the grain of recycled materials are wrapped up in the face by a powder layer. The body density and the strength of samples decrease because of the apparent porosity.
Application of Fiber- Reinforced Composites for Sports Instruments
Authors: Shi Bo Qiang , Cai Yun Tao
Published: March 2013

Fiber- reinforced composites have been applied extensively not only in aero-space, automobile and other industries, but also in sports instruments. The application of fiber- reinforced composites for sports instruments is introduced. The advantage of fiber rein-forced composites, materials selection, products varieties, examples and status of application for sports instruments are discussed.
Design of Mix Proportion of Cement Mortar with High-Performance Composite Semi-Flexible Pavement
Authors: Wang Ya Jun , Guo Chang Ying , Tian Yan Feng , Wang Jian Jun
Published: March 2013

Nine groups of cement mortar with different mix proportion were designed to measure their fluidity 0h, 0.25h, 0.5h, 0.75h and 1h later, compressive strength and rupture strength of 3d, 7d and 28d were also tested to find out the relationship between compressive strength, rupture strength, water-cement ratio and sand-cement ratio by software Origin. Considered the three factors above, the optimum mixture ratio was determined finally to meet the requirements.
Experimental Research on Flotation Separation of a Kyanite Rough Concentrate in Hebei Province
Authors: Nie Yi Miao , Dai Qi Hui , Liu Shu Xian
Published: March 2013

Kyanite is a kind of andalusite minerals, with good refractory. In nature, it existed together with mica, quartz etc, so it is necessary to purify. Garnet kyanite schist in Hebei province as the raw ore was separated in this paper, on the basement of high intensity magnetic separation and gravity to demilish impurities, obtain kyanite rude concentrate, by proceed a series of flotation condition test research, through six- concentrate reelection, getting the flotation concentrate with grade of 56.16%,the productivity of 12.09%,the recovery of 36.82%. Meanwhile, the reason of the low concentrate grade was analysed, and the suggestion was given to deal with kyanite concentrate in the next step. It provided foundation date for the developing of kyanite separation.
Fatigue Properties of Ordinary Portland Cement with Multi-Walled Carbon Nanotubes
Authors: Wang Fu Xia
Published: March 2013

The aim of this study was to investigate the fatigue properties of Portland cement/multi-walled carbon nanotube (MWCNTs) composites. Multi-walled carbon nanotubes of varied functionality (unfunctionalised and carboxyl functionalised), synthesized by infusion chemical vapor deposition, and ordinary Portland cement (OPC) were used to produce pastes with a water to cement ratio of 0.45. The mixing amount of MWCNTs ranged from 0.1 wt.% to 0.6wt.%. The fatigue properties of the MWCNTs–OPC was characterised with the type and wt.% loading of MWCNTs used having a significant influence on the number of cycles to failure. The condition and degree of dispersion of the MWCNTs in the matrix at different length scales were studied using field emission scanning electron microscopy. Improvements of the fatigue properties were attributed to the MWCNTs arresting or retarding crack propagation through the cement by a bridging effect and hindering crack propagation. MWCNTs agglomerates were evident in the cement microstructure and the degree of agglomeration depended on the level of the mixing amount and the ability of the MWCNTs.
Influence of Process Parameters on Pulse Electroforming of Nickel-Rich Nickel-Cobalt Alloys from Sulfamate Electrolyte
Authors: Li Hong You , Yu Ming Ming , Wang Yi , Shi Mao Lin
Published: March 2013

Nickel-cobalt alloys have a wide range of industrial applications because of high strength, good corrosion resistance, heat-conductive, etc. As an example, they are used in the electroforming of moulds for die-casting and plastics and in electrotyping. In this paper, experiments on pulse electroforming of nickel-rich nickel-cobalt alloys were studied on SUS304 substrates from sulfamate electrolyte with different average current density, pulse frequency, duty cycle and different bath temperature. It is clearly observed in the nickel-rich deposits that effect of cobalt content gradually increases as the Co2+/Ni2+ concentration ratio and duty cycle increasing; The Co content seems to hardly change when pulse frequency changed from 500 Hz to 1000 Hz; The Co content decreases as current density increasing. High Co content and smooth surface topography can be obtained by reducing current density, increasing bath temperature and pulse duty cycle.
Nonlinear Structural and Magnetic Transition in Co-Doped Fe2VGa Heusler Alloy
Authors: Wu Bo , Zhang Song , Yang Xiu De
Published: March 2013

By using local spin density approximation (LSDA) scheme within the density functional theory (DFT), the structural, magnetic and electronic properties of Heusler alloy Fe2V1-xCoxGa were comprehensively investigated. The results reveal that with the increase of Co-doped concentration, in Fe2V1-xCoxGa alloy, a nonmagnetic-ferromagnetic transition appears, and the nonlinearly structural and magnetic variation respectively against the linear Vegard law and Slater-Pauling rule are also detected. Further analysis of electronic structure reveals that both contributions from Fe-Co and Fe-V magnetic interaction in Fe2V1-xCoxGa alloy play a dominating role in determining the nonlinear magnetic and electronic behaviors.
Preparation and Characterization of Electroless Silver Plating on PAN Fiber with Chelating Agent of APTES/MPTES
Authors: Xu Peng Peng , Yu Dan , Wang Chao , Wang Ting Ting , Wang Wei
Published: March 2013

Modified by silane coupling agents APTES and MPTES, PAN fiber was provided with multi-chelating-group on it. Through the chelating effect, it can be directly used to eletroless silver plating without roughening, sensitization and activation. The molecule structure, morphology and thermal stability were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and therm-gravimetric (TG) analysis. In addition, electrical conductivity, and washing performance were also tested respectively. The results indicated that silver-coated PAN fiber based on APTES/MPTES modification had high conductivity with a compact and homogeneous silver layer, as well as good washing fastness performance.
Research on Production Technology of Silt Sintered Porous Brick
Authors: Liu Hong Mei , Yang Heng Liang
Published: March 2013

The production technology of silt sintered porous brick in Nantong has been introduced from the following three aspects: the first one, the excavating and processing of raw materials, the second one, the preparation and amount of inside fuel; the third one, mix design and the optimization design of hole shape structure. Four mix schemes have been designed. According to the new standard requirement, using staggered arrangement article rectangle holes and rectangular hole, designed a structure which was eight 36mm*13mm rectangle holes, fifteen 21mm*13mm rectangle holes and the hole rate was 28.4%.
Study on Cracking Control of High Performance Concrete at early Age
Authors: Wang Ya Jun , Wang Jian Jun , Guo Chang Ying , Cao Meng Xing
Published: March 2013

It analyzed the reasons for the early cracks in high-performance concrete, and prepared overall program to improve the mechanical properties and the durability of the HPC. It studied on cracking control of HPC at early age and improvement of impermeability by mixing ratio test. The result showed that , it get better inhibition on the early cracks by reasonable adjustment to the water-binder ratio, fly ash and mineral fine powder dosage with saturated aggregates and the right amount of expansion agent, and it also provided high-performance concrete for different performance with a mixture ratio test methods.
Study on Electrochemistry Property of Ferric(III)-Oxalate-Gluconate Complex and its Dyeing Application
Authors: Yu Dan , Yang Jie , Qian Chong , Zhang Jia Jia , Wang Wei
Published: March 2013

The electrochemistry property of the ferric-oxalate-gluconate complex was investigated using a gold electrode as working electrode. The peak currents of the ferric-oxalate-gluconate complex were found to increase linearly with square root of scanning rate displaying a quasi-reversible cyclic response of the redox process. The optimal conditions could be drawn from the cyclic voltammetry results and K/S values. That is 8.00 g/L ferric sulfate, 10.08 g/L oxalate, 17.92 g/L calcium gluconate and 45.00 g/L sodium hydroxide. Under this condition, we can not only get high reducing strength in the electroanalysis process, but also have cotton fabrics with good dyeability.
Controlled Growth of Nao-Carbon Metarials Based on Anodic Aluminum Oxide Nanotemplate
Authors: Chen Lei Shan
Published: March 2013

The reactions were carried out by decomposing acetylene at 700 °C in a two-stage furnace system under different conditions. In the two furnaces, an AAO template with the average diameter about 50 nm was placed respectivly, whose temperature was designed to be 700 °C. The samples were characterized by scanning electron microscopy and high resolution transmission electron microscopy. The results show that when the reaction was carried out in C2H2-Ar atmosphere, dense and entangled CNTs with diameter, ca. 50 nm were obtained on the top surface of the AAO template in the first furnace and dense and entangled CNTs with morphology of rope were obtained on the top surface of the AAO template in the second furnace. When the reaction was carried out in C2H2- H2-Ar atmosphere, dense and entangled CNTs with diameter, ca. 50 nm were obtained on the top surface of the AAO template in the first furnace, however only a few CNTs were obtained in the second furnace. When the reaction was carried out in C2H2- H2 atmosphere, CNTs were both observed stood on the top of AAO template in the two furnaces
Study on Konjac Glucom Annan-Carrageenan Edible Blend Films
Authors: Zhang Li Qiong , Liu Xiao Yan , Zhao Su Feng , Li Xin Fang , Tu Zhi Gang
Published: March 2013

The konjac glucom annan-Carrageenan edible blend films were prepared.The mechanical properties and the optical properties of the edible films were tested. The results showed that the properties of Blend Films is best when the mass ratio of blend films is 3:1, plasticizer glycerin can significantly improve the properties of blend films , this blend films is expected to develop into a new type of edible packaging films.
Study on the Surface Modification of Nano-TiO2
Authors: Zhao Dong Mei , Qian Gui Min , Yun Shan , Song Qian Qian , Zhu Dong Hai , Li Wu
Published: March 2013

KH550 modified ZnO/TiO2 was prepared. The surface of nano-TiO2 was coated with ZnO derived from Na2Zn(OH)4 via a heterogeneous nucleation process, and coupling agent KH550 was used to treat the surface of ZnO/TiO2. Transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and Optical contact angle measuring instrument were used to characterize the effect of surface modification. The results showed that the surface of nano-TiO2 was coated by ZnO nanoparticles; After modified by the KH550, the modified ZnO/TiO2 showed better dispersion in water-toluene solution; and the surface of modified ZnO/TiO2 became more hydrophobic-lipophilic than that of modified uncoated nano-TiO2.
Synthesis of Patterned Carbon Nanotubes Based on Anodic Aluminum Nano-Templates
Authors: Chen Lei Shan
Published: March 2013

Carbon nanotubes based on anodic aluminum nano-templates embedded with different metal catalysts were synthesized and the influence on the morphology of the products of the gas flow rate and the reaction time was closely investigated. The samples were characterized by field-emission scanning electron microscope. The results confirmed that the products are carbon nanotubes with controllable size and the morphology of the products were different with the different reation conditions.
The Hydrothermal Synthesis of Nanoporous Titanium Dioxide and its Application in Dye-Sensitized Solar Cell
Authors: Jiang Li Ming
Published: March 2013

The nanoporous titania powders are prepared under hydrothermal conditions using the amphiphilic triblock copolymer (Pluronic P123) as the porogent, and characterized by means of XRD and BET. Then, nanoporous TiO2 electrodes are fabricated by Doctor-blade mehod, using the nanoporous TiO2 powders as anode materials, and the photoelectronic properties of the DSCs are investigated by measuring transient photocurrent spectrum and photocurrent action spectra. The results indicate that the porous titania powder have pure anatase structure, and the specific surface area is up to 68m2g-1. In addition, the nanoporous TiO2 electrode shows higher photoelectric performance compared with pure TiO2 electrode.
Three Wave Interfaces of Titanium/Steel Laminates Manufactured by Explosive Welding
Authors: Liu Peng , Jiang Jian Ping , Guo Hong Gui , Sun Bai Lian
Published: March 2013

Optical metallographic examination, scanning electron microscope as well as energy dispersive X-ray spectrometry was operated to the interfaces of titanium/steel laminates manufactured by explosive welding. According to the variation of the thickness of brittle Ti-Fe intermetallic compound at the interfaces, typical wave interfaces of titanium-steel laminates are classified as over melted wave interface, tinyly melted wave interface and optimum wave interface. Furthermore, the features of three wave interfaces are brought forward.