bluuebunny/crossref_metadata_2025 huggingface dataset:
UV-Spectrum Analysis of N-Octyl Pyridine Tetrafluoroborate in Ethanol
Authors: Yang Mo , Tian Peng , Zeng Jing
Published: December 2014

Ionic liquids have been attracting extraordinary attention for their unique properties, such as high ionic conductivity, negligible vapor pressure, and high thermal and electrochemical stability, which have made their varied applications in organic chemistry, material science, chemical engineering, physical chemistry, analytical chemistry and biotechnology. N-octyl-pyridine tetrafluoroborate is prepared by the double decomposition reaction of OPB and NaBF4. The ionic liquid at room temperature used in the experiment has a significant absorption determined by UV spectrum within the range of 200-400nm, the maximum absorption wavelength of OP-BF4 ionic liquid in ethanol is 243nm. The standard working curve of OP-BF4 ionic liquid is y=0.0322+0.01542X (R=0.99962). The linear range of OP-BF4 ionic liquids in the ethanol is 1-75 mg/L. The recovery rate of OP-BF4 ionic liquid which is between 96.8% and 101%, is measured by standard addition method in ethanol.
Improving Maize Growth by Biochar and Biochar-Based Amendment in Light Sierozem in Ningxia
Authors: Li Dong , Chen Lei , Song Xiao Na , Liu Guo Cheng
Published: December 2014

Biochar has been applied in soil amelioration due to its multiple agricultural and environmental benefits. Biochar sample (BC) and biochar-based amendment (AD) were added into a poor quality soil (light sierozem) collected from Ningxia Hui Autonomous Region at the rates of 0%, 1.5%, 3% and 5% (w/w), respectively. Maize (Zea mays) was chosen as a test plant, and the effect of BC and AD on its growth was investigated. The results indicated that the maize biomass increased by 44.4-96.2% and 113.8-187.3% in the soils amended with BC and AD, respectively. Therefore, BC and AD may be used as the poor quality soil amendments.
A Study on Application of Real-Time Online Analysis of Ventilation Safety Data Based on Coalmine Monitoring System
Authors: Yan Zhen Guo , Wang Yan Ping , Chang Xin Tan
Published: December 2014

Due to poor coalmine monitoring system data utilization and relatively high threshold for application of most application software in ventilation safety field, a multi-perspective coalmine ventilation management technology, with the goal of daily ventilation safety management, is introduced based on the real-time data from the coalmine monitoring system. Specifically, data acquisition unit is adopted to collect monitoring data in a real-time manner, and then integration of ventilation and coalmine gas data is made. After that, real-time online data analysis and display can be realized by using smart guidance and multi-screen linkage technologies according to chained features of the data. In this way, daily management interfaces based on specialized knowledge are shown in a friendly manner. Therefore, the technology proposed here can greatly improve coalmine management level and work efficiency. At the end, Huangling No. 2 coalmine is taken as an example to validate the relative technologies.
Evaluation of Uncertainty for the Determination of Magnesium Oxide Content in Limestone by the Atomic Absorption Spectrometry
Authors: Wen Xiang Dong , Zhou Zheng , Pan Wen Yang , Shao Mei
Published: December 2014

According to GB/T3286.1-2012(The determination of calcium oxide and magnesium oxide content in limestone and dolomite), the mathematical model of magnesium oxide content determination in limestone by atomic absorption spectrometry was established. The various uncertainty factors of different elements for a sample were discussed and compared in the testing process. The confidence interval for the measurement result was (0.74±0.03)%,k=2 in uncertainty evaluation .The results showed that the variability of working curve and accuracy of standard solution volume for working curve were main influence factors of uncertainty. It could effectively reduce the uncertainty from the perspective of the main factors,and improve the quality of analysis.
The Effect of KNO3 on Electrolysis-Assisted Flocculation of Azophloxine Using Polyaluminum Chloride
Authors: Zhou Li Na , Du Ling , Zhang Wen Jie
Published: December 2014

Electrolysis-assisted flocculation methods were used in decoloration of azophloxine. Electrolysis-assisted flocculation of azophloxine was conducted under the applied potential using titanium anode. The concentration of KNO3, flocculating time and applied potential were investigated. The application of applied potential has nearly no power to remove the dye from wastewater since the highest decoloration rate is only 2.5% after treatment at KNO3 concentration of 0.6 mol/L. The total flocculating decoloration efficiency decreases gradually after increasing the KNO3 concentration in the solution. When the applied potential is 7 V, the maximum electrolysis-assisted flocculating decoloration rate is 52.3%. When the electrolysis-assisted flocculating time is 5 min, the maximum decoloration rate is 54.2%.
Influence and Optimization of Boiler Efficiency
Authors: Li Hao
Published: December 2014

The principles-related knowledge of boiler is mainly applied to analyze the relationships between boiler efficiency and excess air coefficient and the main parameters, and also the method of optimizing operation of the boiler is proposed.Key words: image analysis method; principal component analysis; boiler efficiency; optimizing operation
The Modification to the FEM Model of the Prestressed Concrete Beam with the Combination of the Data of Static and Dynamic Test
Authors: He Tao , Zhao Chong Ji
Published: December 2014

Using the finite element software ANSYS to establish the model of prestressed concrete T beam .With the combination of dynamic and static load test data, the objective function was constructed by taking the vertical deflection of the static load test and the top five vertical natural frequency of dynamic test as state variables. The results revealed that,after being modified ,the error between the calculation value and the testal results of the model was converged in a reasonable error range.In addition ,The modified model could be used in the assessment of bridge structure performance,and it shows the practical application value.
Synthesis and Properties of [1-(3,5-dimethyl-4-iodoisoxazole)-2-(2-methyl-(5-ethynyl)trimethylsilane-3-thienyl)perfluorocyclopentene
Authors: Tian Zhao Yan , Cui Shi Qiang , Pu Shou Zhi
Published: December 2014

A photochromic diarylethene of [1-(3,5-dimethyl-4-iodoisoxazole)-2-(2-methyl-(5-ethynyl) trimethylsilane-3-thienyl) perfluorocyclopentene (1o) was synthesized and characterized. Its properties, including photochromic behavior and fluorescent properties have been investigated. Upon irradiation with UV light with the extended response time, the diarylethene underwent a ring opening reaction to produce closed forms and color change in solution. The results showed the compound exhibited good photochromism in acetonitrile solution. The kinetic experiments showed that the cyclization and cycloreversion processes were zeroth and first order reaction, respectively. Moreover, diarylethene1oalso exhibited obviously fluorescence switches along with the photochromism.
Analysis Model of Computer Network Security Teaching Founded on Apriori Algorithm
Authors: Huang Jin Shan
Published: December 2014

The main purpose of computer network security research is extract system data and factors related to the computer network security, and then establish a model which is analyze the security of computer network. Analyze the association rules and its related mining algorithm Apriori, through the application of the improved Apriori algorithm founded on pretreatment in computer network security teaching; explain the process of data mining and analysis of mining results, finally points out the future research direction. This model mainly analyzes the contents of three aspects as the requirements of computer network system security, degree of safety and threats to computer security, to check the security of the computer performance.
An Improved Close Value Method for Multi-Sensor Object Recognition
Authors: Zhang Chang Qing
Published: December 2014

Multi-sensor information fusion problem contains many characteristic indexes, and thus it can be resolved using a multi-attribute decision making method. Information entropy is used to objectively determine the attributes weights, and thus it can overcome the subjective randomness. The aim of this paper is to develop a new multi-sensor object recognition method based on close value method. The example of part recognition proves that the proposed method is both feasible and effective.
Evaluation of Electric Vehicles' Impacts and Rationalization of their Energy Sources' Distribution Based on Analytic Hierarchy Process and Multi-Objective Programming Model
Authors: Jiang Ze Ming , Hou Cong
Published: December 2014

By using Analytic Hierarchy Process (AHP), a solution is given in different aspects to analyze the weight of the impacts of electric vehicles. The economic and social impacts are found out to be the key factors. When EV’s penetration rate reaches a certain level, the lowest cost, lowest harm degree to our environment and society, and maximum possibility are considered to avoid using un-renewable energy. In addition, multi-objective programming model is built to solve the problem of the amount and type of electricity generation needed that will produce the largest number of benefits.
Application of Sericin in Anti-Crease Finishing of Silk Fabric
Authors: Xu Lei
Published: December 2014

It is of perfect anti-crease effect that using sericin finishing agent in finishing of silk fabric. Analyzed integration test of wrinkle resistance of silk fabric, the optimally applied parameters are obtained as follows, the dosage of sericin is 15g/L, the concentration of TEA is 8g/L, twice dip and twice rolling, drying, baking in 3 minutes at 150 °C. The wrinkle recovery angle has been increased obviously after sericin finishing. Also the performance of anti-crease resistance can be improved effectively by adding 3g/L of sodium hypophosphite. The phenomena of increased solvent viscosity and activation energy of thermal decomposition were shown that the cross-linking structure were formed in the fiber with the using of sericin finishing, thereby the wrinkle resistance of the fabric was improved. Sericin finishing agent can increased the wrinkle resistant properties of fabrics effectively.
A Rapid and Sensitive Chemiluminescent Immunoassay of Bisphenol a with NSP-SA-NHS-Labeled
Authors: Yang Fan Fan , Zhu Li Xin , Xu Long , Liu Ren Rong , Fan Yan , Meng Wei
Published: December 2014

A novel chemiluminescence immunoassay (CLIA) of Bisphenol A (BPA) with the acridinium ester of NSP-SA-NHS-labeled has been developed. In this study, BVA and NSP-SA-NHS had been coupled with BSA, the UV spectrum results indicated the conjugates which were successfully synthesized. Basing on these luminescence data the inhibition curve of BPA was established, then the linear arrang of the curve was between 0.4 ng/ml and 5 ng/ml, the 50% inhibitory concentration (IC50) was 2.3ng/ml, the lowest limit of detection was 0.1ng/ml, which showed it’s an efficient and highly sensitive method.
Preparation of the BaF2: Ce3+, Yb3+ Nanoparticles and near Infrared Luminescent Properties
Authors: Li Su Wen , Jiang Yi , Ju Shu Guang
Published: December 2014

The BaF2: Ce3+, Yb3+ nanoparticles doped with different concentration were prepared by a hydrothermal method. The structure,morphology and photoluminescence properties were studied. In BaF2: Ce3+, Yb3+ nanoparticles, a strong near infrared emissionat 900 – 1050 nm matching to energy of Si band gap of Si-based solar cells was observed under the excitation of 5d level of Ce3+. As a downconversion luminescent convertor, the kinds of materials have potential to be applied in front of Si-based solar cells to reduce thermalization loss and enhance conversion efficiency of solar cells.
The Precision Forging Experiment of Mg Alloy Drop Forging Using Computer Simulation
Authors: Kapustová Mária , Bílik Jozef
Published: December 2014

Rapid development of automotive industry brings increasing demand for die forgings made from non-ferrous metals. Market economy stimulates drop forges to produce forged pieces of highest quality and dimension precision with the accent on reduction in production costs. Precision die forging without flash belongs to progressive and economical technologies of die forgings production. This paper describes an experiment of precision forging in closed die of magnesium alloy type AZ 31. Given alloy type Mg-Al-Zn is suitable for bulk forming and is characterized by good hot formability. Achieved results may be applied in practice at production of longitudinal shaped forgings e.g. levers and connecting rods. In order to verify a design of closed die forging technology regarding the lever-shaped forged piece, simulation program MSC.SuperForge was used. Numeric simulation was significantly helpful at optimization of semi-product shape and dimensions and confirmed correct plastic flow of material in closed die cavity. The objective of this contribution was to point out current trends in searching for economical measures at production of die forgings from alloys of non-ferrous metals.
High Performance Nanostructured Silicon Oxide Impedance Biosensor System with Online Noise Spectroscopy Analysis
Authors: Samanta Nirmalya , Ghosh Hrilina
Published: December 2014

In this paper, noise spectroscopy has been reported earlier as an efficient tool for enhancing the selectivity of biosensors and the analysis was carried out by desktop spectrum analyzer. There were no reports, however, on the efficacy of this method in complex mixture. We have performed here for the first time, noise spectroscopy analysis on complex mixture of food toxin samples and observed that the first cut-off frequencies are indicative of the fact whether the solution has only specific antigen, mixture of specific and nonspecific antigen or no specific antigen at all. To realize a portable immunosensor, we have developed an electronic interface using digital signal processor (DSP) chip of Microchip Technology which has the embedded Fast Fourier Transform (FFT) algorithm for computation of noise spectrum. The entire system has been successfully demonstrated to detect 0.1 fg/ml aflatoxin B1 (AfB1) from a complex mixture with as high as 1000ng/ml non-specific toxins.
Effect of Sintering Time on the Density, Porosity Content and Microstructure of Copper – 1 wt. % Silicon Carbide Composites
Authors: Almomani Mohammed A. , Shatnawi Ahmad M. , Alrashdan Mohammed K.
Published: December 2014

In this paper, several copper matrixes reinforced with 1 wt. % silicon carbide (SiC) were fabricated using powder metallurgy (PM). The effect of sintering time (30 min, 60 min, 90 min, and 180 min) on composite density and porosity, and grain size were investigated. The results showed that longer sintering time gives higher sintered density, and smaller porosity content. This is due to the diffusion enhancement, which leads to reduce pore size, and close porosities. Also, for a given compaction pressure, the grains tend to be coarser for longer sintering time, due to the materials tendency to reduce grain boundary surface energy. In addition, samples compacted at high pressure have finer grain than corresponding grains compacted at low pressure but sintered for the same time.
Investigation of Non-Monotonic Portions on the Temperature Dependences of High-Temperature Metal Melts’ Physical Properties
Authors: Povodator Arkadi , Tsepelev Vladimir , Konashkov Viktor , Vyukhin Vladimir
Published: December 2014

Temperature dependences of liquid alloys contain non-monotonic fragments in the form of excesses and breaks. The paper analyzes the dependences of oscillations’ attenuation ratio upon temperature. The qualitative and quantitative estimation of anomalies on melt properties’ dependences upon temperature is made, for example, values of viscosity. The proposed approach allows analyzing properties of the melt and developing technological recommendations for production of materials possessing high characteristics.
The Synthesis of TiC Powders by Carbothermal Reduction Method in Vacuum
Authors: Ren Xue Tan , Liu Yan Chun , Chen Shui Hui , Hou Lai Guang , Wang Guo Long , Teng Yuan Cheng
Published: December 2014

The TiC powders were synthesized by carbothermal reduction of TiO2in vacuum using the titania and carbon black as raw materials. The molar ratio of C to TiO2was 3:1. The crystalline phase, microstructure and morphology of the obtained samples were investigated by XRD and SEM. The results show that single-phase and well-crystallized TiC powders were obtained at 1300°C for 1h when the system pressure was 20 Pa. The particle morphologies are composed of fine grains about 200 nm.
Oxidation of Cyclohexene over Mesoporous Silica Pillared Clay Incorporated with Heteropoly Acid Prepared by Sol Gel Method
Authors: Boudjema S. , Choukchou-Braham A. , Bachir R.
Published: December 2014

Mesoporous silica pillared clay (SPC) materials with different contents of H4PMo11VO40 (PVMo) heteropoly acid were synthesized by introducingPVMo into clay interlayer template in an acidic suspension using sol–gel method. The results of the characterizations showed that PVMo was dispersed homogeneously in the encapsulated samples. The encapsulated materials exhibited good catalytic performance in oxidation of cyclohexene.
Shrinkage Behavior of Composite Geopolymer Mortar Cured at Different Relative Humidities
Authors: Chang Ta Peng , Chen Zih Cian , Yang Tzong Ruey
Published: December 2014

In this study, the slag and metakaolin which contain rich elements of silica and aluminium were used to manufacture three types of composite geopolymer mortar: Type A (100% slag), Type B(70% slagand 30% metakaolin) and Type C(30% slag and70% metakaolin). Both the sodium hydroxide and sodium silicate solution were used as the activators. Experimental parameters included three ratios of SiO2/Na2O of 0.6, 0.7 and 0.8, three concentrations of alkali activator (7, 9 and 15%) and three water-to-solid ratios (0.33, 0.45 and 0.55), and four volumetric ratios of fine aggregate to whole mortar of 0, 10, 30, 50%, respectively. Two curing conditions of 50% relative humidity (RH), 25±2°C and 75% RH, 25±2°C were used for the dry shrinkage test. The results of study show that, at age of 28 days, the Type Bgeopolymer had the lowest drying shrinkage in the range between 450 and 760microstrains at 50%RH, and decreased to values between 270 and 340microstrainsat 70% RH.The average compressive strength of 89.3 MPa at age of 28 days for geopolymer mortar without metakaolin decreases to 74.7 MPa and 49.6 MPafor those with added metakaolin by 30 wt% to 70 wt%, respectively.
A Market Scene Detection and Reinforcement of Large Roof Rack
Authors: Yang Yong , Zhang Xin , Liang Meng , Li Ming Fei , Yang Zhao Peng
Published: December 2014

A mall large roof rack has been used 17 years. Because of upgrade, addition of decorate load, and missing the original design drawings, the spatial site test and check calculation of bearing capacity will have to be done. Using some detection tools, we can get arrangement, size, displacement, deformation, etc. And we can sue 3d3s software of Tongji University to check the calculation of bearing capacity. Through calculation and analysis, put forward to the original network frame the whole pre-stressing reinforcement and part of steel reinforcement bar outsourcing way, satisfying the requirements of design and specification, and to avoid the welding process, shorten the construction period, and achieved good social benefits.
A New Method for Modal Parameter Identification Based on Natural Excitation Technique and ARMA Model in Ambient Excitation
Authors: He Can , Xing Jian Chun , Zhang Xun
Published: December 2014

Due to the interference of strong vibration signal, a big error exists in modal parameter identification based on traditional ARMA model. In order to solve this problem, a new method for modal parameter identification based on natural excitation technique (NExT) and ARMA model is presented. Firstly, NExT is used to obtain cross-correlation function of different response sequences. Then, ARMA model of cross-correlation function is established, and the parameters of ARMA model are estimated by least squares method. Finally, the modal parameter identification is achieved using the relationship between the ARMA parameters and structural modal parameters. Experiment shows that the identification results of our method are more accurate than the traditional ARMA model.
A Removable Stiffness Increasing Device of the Concrete Precast Slab and its Performance Analysis
Authors: Liu Ti Feng , Ding Cai Gao , Leng Fei
Published: December 2014

Assembled monolithic structure is a common structure in the process of housing industrialization, among which the composite plate is an indispensable element. The thickness of the precast slab of composite plate is small so special measures have to be adopted to prevent the excessive deformation even destruction occurred during hoisting or transport. A novel removable stiffness increasing device for precast slab is presented in this paper. The device consists of steel truss, upper steel plate and steel base plate and can effectively improve the performance of the slab during hoisting and transport. The device has the advantages of simple construction and no special equipment is necessary. The device can be removed after being hoisted and saving cost. The performance of the slab with the device during hoisting and transport is analyzed and appropriate shape parameters are suggested.
A Simplified Transfer Matrix Method for Horizontal Seismic Response of Wall-Frame Structures Considering SSI
Authors: Zhang Shuo Ying , Li Ming Tao
Published: December 2014

Based on the double member model of wall-frame structure and the corresponding transfer matrix method, the concept of frequent impedance of rigid foundation is introduced so that SSI can be taken into account. This method is more convenient and efficient compared to finite element method because of fewer structural parameters and faster calculation speed. Necessary structure parameters include 7 parameters of each storey, geometry size and total mass of foundation and elastic parameters of site soil. Totally 39 examples were calculated for 13 values of foundation mass and 3 kinds of soil, which are compared to the result of fix bottom model of upper structure. Results show that SSI does not always deduce a decrease of seismic response. Sometimes SSI may increases structural displacement evidently. The simplified method would provide structure designers an efficient tool to understand seismic behavior of wall-frame structures with various foundation and site soil.
Seismic Response Analysis of Tower-Foundation-Soil Dynamic Interaction in Transmission Line Engineering
Authors: Zhang Yan , Zhu Zhu Bing , Feng Zi Xia , Xu Xi Yu
Published: December 2014

Considering the contact effect between foundation and soil, the dynamic interaction model of tower-foundation-soil coupled system is set up with visco-elastic artificial boundary as the soil boundary. The seismic time history response of a tower-foundation-soil system under three different site conditions is calculated, and compared with the results that do not consider the effect of tower-foundation-soil dynamic interaction. It shows that the displacement of tower and the axial stress of the members substantially increased on soft sites and medium soft sites while no significant change on medium hard sites and hard sites when tower-foundation-soil dynamic interaction is considered. Therefore, it is suggested that the tower-foundation-soil dynamic interaction should be considered in aseismic design of transmission tower on soft sites and medium soft sites.
Seismic Testing of In-Plane Flexural Damper in Arched-Shape
Authors: Chien Chia Shang Chang , Wang Wei Yuan , Huang Ging Huei , Wang Yen Po
Published: December 2014

This study proposes an innovative displacement-dependent metallic yielding damper for seismic protection of building structures. The damper is designed to deform inelastically under in-plane flexural bending and becomes energy-dissipative with an improved efficiency in terms of material utilization, as compared with those designed to bend in an out-of-plane manner. Both component test and seismic performance test of the proposed damper have been conducted in this study. Hysteresis of the component test indicates consistent and effective energy-dissipative characteristics of the damper. The contour of cracks on the surface of the damper after testing is well correlated with the stress distribution obtained from numerical analysis. Moreover, excellent seismic performance of the proposed in-plane arched damper has been demonstrated via a series of shaking table tests on a five-story model structure. Experimental results indicate that, with the dampers implemented, the acceleration responses in both peak and root-mean-squares of all floors are significantly reduced and more pronounced with the earthquake intensity increased. Effectiveness of the seismic damper is also revealed from the increase of the effective modal damping of all modes identified.
Creativity Thinks on the Significances of Geobiology about the Coal Series
Authors: Tian Shuo Fu , Lu Chao Jin , Wang Yuan
Published: December 2014

It is the components, living things evolution processes, development environments, distribution layers and the earliest time for coal series formation that are investigated and studied in detail based on the author’s graduation thesis, the “Geobiology” , the “China coal petrology” and the other’s some references in this paper. And it is considered that mainly two types of the Coal Series might be distinguish in the geologic history in China, respectively consisted of the lower organisms (especially the lower plants, blue-green algae) and higher organisms (especially the higher plants, pteridophyta, gymnosperms, Anthophyta). Meanwhile, the conclusions can be drawn that the development of the organisms is not only controlled by the environments, on the other hand, the environments and their sediments are also affected by the ecologies of the organisms. So the coal bed or coal series can be used as the marks of the environment explanation, perhaps having some Significances of Geobiology. In additional, the relationship with an unconformity or disconformity is discussed here, too.
Experimental Investigation on the Bearing Capacity of Cold-Formed Thin-Walled Steel-OSB Composite Floor
Authors: Cao Bao Zhu , Xu Hai Xiong , Omary Omary , Teng Xue Feng
Published: December 2014

An experiment was performed about the bearing capacity of cold-formed thin-walled steel-OSB composite floor by the sand heap. The strain and deflection response of OSB board and steel beam is analyzed under the load; then the test process is simulated by ANSYS, the results of simulation are agreed with the experiment basically. Through the analysis of experiment and finite element simulation, the results indicate that the composite floor has enough bearing capacity and meets the requirement of the residential building completely.
Effect of Flexible Pile on Rigid Flexible Pile Composite Foundation with Geogrid Reinforced Cushion
Authors: Liu Kai Fu , Hu Yi , Zhu Yi Jun , Zou Zhi Yan , Mao Jin Ping
Published: December 2014

Compared with pile-supported reinforced embankments, rigid-flexible pile composite foundation with geogrid reinforced cushion (RFPCFGRC) has its advantage of its economics. Piles play an important role in rigid flexible pile composite foundation with geogrid reinforced cushion. The bearing mechanics of RFPCFGRC is more complicated than that of pile-supported reinforced embankments because of addition of flexible piles. This paper discussed the diffence and the bearing mechanics of the two types of composidte foundation. The results show that addition of flexible piles has changed bearing mechanics of composite foundation and changes the load distribution among piles and soil. Soil arching degree of RFPCFGRC is larger than that of pile-supported reinforced embankments.
Research on the Nonlinearity Finite Element in the Super-Long Reinforced Concrete Frame Structure
Authors: Zhang Yong Sheng , Li Yan Ying
Published: December 2014

Basing on the finite element analysis software, the emergence of crack under the effect of gradual changed temperature load and the change of stress which are in the condition of super reinforced concrete frame structure are analyzed from the linear and nonlinear numeral simulation. The simulation shows that the structure component under the normal condition is cracked and turn into the nonlinear condition and the steel bars still works under the elastic stage. Meanwhile the actual stage which is reflected by the elastic-plastic analysis of the internal force and deformation is compared by the results which are obtained by the actual project observed results and the calculation of the simplified model. So the distribution of the stress which is caused by the structure temperature reduction is greatly evaluated by the usage of the cracking model which is nonlinear finite element and also plays an important role in the engineering project and practice.
Stability Analysis of the Radiant Cable Suspendome
Authors: Liu Zhen Hua , Shan Hong Zhu , Liu Xiang Yu , Wang Tao
Published: December 2014

Radiant cable suspendome based on single-layer lattice shell is proposed in this paper whose cable-strut system is like that of Radiant Beam String Structure, the purpose of this paper is to do stability analysis of the structure.The linear buckling analysis of the hybrid structure and the single-layer lattice shell who has the same geometry parameters is carried out, we can preliminarily understand the stability of the hybrid structure. At the same time, nonlinear buckling analysis is carried out to study the stability of the hybrid structure under different rise-span ratios, different prestress level and half-span load. The results show that the introduction of prestressed cables greatly improve the structure's stability and reduce the structure sensitivity to original geometrical imperfection.
Study on the Influence of Infilled Wall on the Seismic Performance of Bottom Frame Structure
Authors: Deng Hong Yu , Sun Bai Tao
Published: December 2014

In the current code of seismic design in our country,infilled wall are considered as non-structural component and do not participate in the seismic checking. In the bottom frame structure, the infilled wall of the first floor often change the number and position for using function at random,this will have unfavorable impact on the main structure. In this paper, a serious damaged bottom frame structure in high intensity area in Wenchuan earthquake is taken as the research object,and 3 comparative calculation models are designed, elasto-plastic time-history analysis is carried out on the use of ABAQUS finite element software. The calculation results show that: the first layer containing infilled with high wall content ratio will reduce the first floor damage, but causing the weak layer of the overall structure transfer from the bottom to transitional masonry story which aggravates damage, at the same time, an appropriate increase in wall content ratio can reduce the torsional response at a certain extent; nonuniform arrangement infilled wall has little effect on the floor deformation and resistance, but it will increase the torsional response of the whole structure.
Study on the Seismic Performance of the Braced Controlled Rocking Reinforced Concrete Frame Structure System
Authors: Li Pei , Liu Jian Xin
Published: December 2014

On the basis of structural concept design, this paper puts forward a new braced controlled rocking reinforced concrete frame structure system, researching dynamic characteristics of the BCR-RCF structure when the joints is been weakened in different levels by using finite element analysis software Abaqus, analyzing the reasonable degree of rocking joints stiffness weakening. By comparing the dynamic response of conventional reinforced concrete frame and the BCR-RCF structure, it shows that the BCR-RCF structure can effectively reduce the structural shearing force and acceleration response, however, displacement and velocity response is bigger than RCF structure. Compared with the RCF structure, shearing force and displacement responses of the BCR-RCF are more evenly distributed along the floor, which helps preventing excessive concentration of interlaminar deformation, so that materials of every layer can be fully utilized. After adding metal damper into the BCR-RCF structure, the displacement response can be effectively controlled.
Experimental Research on a New Type of Hydraulic Fill Sealed Vacuum Preloading Technology with the Sand Cushion Excluded
Authors: Liang Ai Hua , Li Jing Shuang , Chen Zhi Jun
Published: December 2014

This paper presents a new vacuum preloading technology in which hydraulic fill is used for sealing while the sand cushion is not necessary. Thus this technology is applicable for projects with scarcity of sand resources.This paper dedicates the characteristics of this technology, reinforcement mechanism, applicable scope, construction technique, reinforcing effect and prospects, in an effort to provide guidance and promote the application of this technology.
The Response of Somatotype Characteristics of Circular Underground Diaphragm Wall Structure
Authors: Liu Yao Dong , Hu Wei , Huang De Xin
Published: December 2014

In this paper, study is based on analytical solution of internal force and displacement of circular underground continuous wall, the internal force and displacement of wall in different wall thickness, radius and depth were analyzed, the pattern of the internal force which changed with the body characteristic was discussed.
Kappa(κ) from Records of Small Earthquakes in North China
Authors: Tao Zheng Ru , Tao Xia Xin , Li Wen Qian
Published: December 2014

At high frequencies, there is an obvious descending of Fourier spectrum amplitude of ground motion acceleration. This fact could be described by a low0pass filter that is controlled by parameter Kappa (κ). In most regions of the world, there are not sufficient strong ground motion records to evaluate this regional parameter. We try to acquire κ value from small-earthquake records of the broadband digital seismograph network in North China (36°-43°N, 113°-120°E). Total 1995 records from 28 small earthquakes (Mw=3.5-4.5) recorded at 155 stations of China Earthquake Network during February of 2002 to September of 2012, are analyzed. The κ value is acquired from the slope rate of the decay segment of the calculated Fourier spectrum of each record, and the mean value is obtained. The result is analyzed if κ is magnitude, focal depth or distance dependent. For the magnitude-dependence, κ values of 40 strong ground motion records are also obtained and compared. The result of the paper shows that κ is not magnitude-dependent neither focal depth-dependent. The distance-dependent is not obvious, especially for small earthquake.
Progress in Seismic Research on Electrical Equipments in Substations
Authors: Lu Zhi Cheng , Li Sheng , Zhu Zhu Bing , Zhong Min
Published: December 2014

The Wenchuan earthquake in 2008 caused serious damage to electrical equipments in substations. In recent years after Wenchuan earthquake, domestic scholars and research institutions have carried out a lot of research on seismic performance of electrical equipments in substations. These research yielded good results as a whole and enhanced the seismic safety of power system in China. In this paper, seismic research progress of this filed in recent years were summarized systematically, covering the topics such as fortification targets, seismic analysis method, seismic performance testing methods, isolation technique. Future research directions on this filed are also prospected.
Research on the Seismic Performance of Brick-Concrete Structural Buildings in Indonesian Rural Areas
Authors: Huang Mei Ling , Fu Zhao Yu , Bao En He
Published: December 2014

By investigating on rural housing construction in Djetis county, a region of Java Island Banjul, Indonesia, modeling according to their different weight of roofs and other factories, and combining with 3D seismic wave that was gotten by American EL Centro-seismic wave amplitude modulation to analyze by the finite element, it is shown that the larger quality of roof and the greater the displacement of itself each part, the bigger influence of structure and the easier causes damage. Maximal displacement produced by out-of-plane is larger than maximal displacement produced by in the plane, so the out-of-plain damage is the main cause of structure damage. In addition, based on the finite element analysis, precaution against earthquake measures of limiting to widen the top roof truss girder cross section and setting continuous wall between coupling beam are presented.
Process of Tower Erection in Sections with Internal-Suspended and External-Guyed Holding Pole of Pivot Strut of Iron Tower’s Main Members
Authors: Ni Da , Yang Huai Wei , Chen Xiao Yuan , Xia Yong Jun
Published: December 2014

This thesis introduces the main process flows of holding pole lifting and supporting pole installation during the tower erection by combining the landform features of “high mountains and highlands in Eastern Tibet and Western Sichuan Province” of power transmission and transformation of grid networking between Changdu of Tibet and Sichuan Province, aiming at the problem that that the line stringing of holding pole is influenced by landforms of cliff, etc. and adopting light combined compound-material holding pole as lifting mechanism, to solve the tower erection at the tower positions like cliff and isolating mountains where traditional holding poles cannot be erected effectively.
A Comparative Study on the Horizontal-Evacuation-Related Criteria in Buildings
Authors: Woo Su Jin , Hwang Eun Kyoung
Published: December 2014

With the recent increase in the construction of Super-high-rise structures and large complex buildings, the risk of fires has been on the rise. As the size of the structure becomes larger, the occupants’ evacuation time becomes longer, and the required firefighting structures become more complex, resulting in an increase in casualties and property damages. In South Korea, vertical-evacuation facilities and criteria have been proposed, but there are very limited horizontal-evaluation criteria.In this regard, this study sought to investigate the horizontal-evacuation facilities and criteria in South Korea to deduce the related problems, and to conduct a comparative review with the overseas horizontal-evacuation-related criteria.The results of this study can be utilized as basic data for the establishment and revision of horizontal-evacuation criteria in South Korea in the near future.
Research on Water Pump Isolation Parameters Based on Power Flow
Authors: Kong Xiang Jun , Chen Chang Zheng
Published: December 2014

Vibration parameter of water pump is studied by power flow theory, water pump isolation vibration system can be simplified a single-deck isolation system model, by using electric-machine (E-F) analog method, the curves of foundation speed amplitude and power flow are drawn, the results show that the inertia block has clearly reduced the vibration power flow and speed amplitude, increasing the mass of inertia block can decrease the first peak point and make the first peak point moving toward the low frequency direction, increasing surface density of the basement can decrease input power flow and the vibration of basement.
Analysis of Increase Reason on AC-13 Asphalt Mixtures Voids
Authors: Tian Shuai Tuan , Ye Song , Zhao Zhen Yu
Published: December 2014

We make specimens with different gradation types ,different fine aggregates , different molding methods, we calculate their air voids , we analyze the cause of increased porosity of mixture from different aspects. The results show that when we use the same aggregate and the same gradation, the air voids show small difference from the designing method of Gyratory Compactor and Marshall ; when we use the same molding methods and and gradations and different fine aggregates to form specimens, the void ratio of basalt fine material is larger,the the void ratio of limestone fine material is smaller; The main reason is the bulk density of basalt fine aggregate is larger,and it is not easy to compaction.
Numerical Simulation of Internal Defects in CSG Concrete (IV)
Authors: Ma Jing , Wang Yan , Yang Ling Qiang
Published: December 2014

The objective of this paper is to quantify the influence of internal defect on the multiaxial strength. Numerical analyses are performed for the second and third axial strength of the concrete. The analysis result indicated the existence of defects not only decreases the strength of materials, but also changed the stress state of the specimen.
Portholes Die Extrusion Process Numerical Simulation and Optimal Die Design
Authors: Zhang Yun Ji , Su Yong , Wei Ran , Yi San Zhou , Wan Bin
Published: December 2014

In the paper, extrusion process of hollow aluminum profile was simulated using DEFORM-3D; the metal flow velocity of setting baffle-blocks before and after is compared. Three kinds of welding chamber depth of 10 mm, 13 mm, 15 mm were used respectively for extrusion process simulation and got die load varying pattern. Also the strain field and temperature field were analyzed. The results show that the metal flow velocity was more well-distributed by setting A、B、C、D baffle-blocks. When the weld chamber depth is 13 mm, the die load is the smallest. By analyzing the strain field and temperature field,The results showed that the major cause of metal temperature rising in the extrusion process is deformation energy generating in the process of metal plastic deformation.
Research on Nickel Slag Powder as Concrete Mineral Admixture
Authors: Yang Ding Yi , Li Hao , Yue Han , Ge Li Jie , Wang Wen Hua
Published: December 2014

s. Using industrial waste residue as concrete mineral admixture has become a direction of the development of the green concrete. Nickel slag is mainly introduced, and the chemical composition and preparation of nickel slag powder, and study its physical properties, activity, volume stability and mechanical properties. According to nickel slag powder admixture amount of replacing cement, admixture fineness, mixed with admixture of concrete changes between the intensity of the three, put forward suitable fineness of slag powder and nickel content of concrete.
Research on the Relationship between Thermal Conductivity and Porosity during Carbonation of Cement Materials
Authors: Pham Son Tung
Published: December 2014

The objective of this work was to examine the relationships that may exist between porosity and thermal conductivity with particular reference to normalized cement mortar which is most commonly found in civil engineering. Samples were prepared and subjected to accelerated carbonation at 20°C, 65% relative humidity and 20% CO2 concentration. We investigated the evolution of the total porosity measured by hydrostatic weighing and of the thermal properties measured by Hotdisk method. This experimental campaign allowed relating the total porosity and the thermal conductivity before and during carbonation. These results can be used for further studies which can propose models predicting the thermal conductivity if changes in porosity are known. Moreover, the results indicated that the thermal conductivity of a cement material is directly related to the density and inversely related to porosity. Finally, this study showed that a characteristic coefficient can be deduced for two states of material: non-carbonated and carbonated. This coefficient is therefore proper to a specific material and can be used not only for modeling the relationship between porosity and thermal properties but also for other microstructural studies of cement materials.
Experimental Study on Flexural Properties of Steel Fiber Combined Aggregate Concrete
Authors: Zhang Yan Kun , Wu Xiao Long , Wang Yu Cheng
Published: December 2014

In this paper, the flexural performance of steel fiber combine aggregate concrete under the different factor (water cement ratio, quantity of light aggregate, steel fiber volume fraction, and the types of steel fiber) is studied. And the orthogonal experiment method is adopted. From the experiments, it could be found that the most important factor affecting the flexural strength is the steel fiber volume fraction, and then the types of steel fiber, the water cement ratio, and the quantity of light aggregate in the order. With the increasing of the steel fiber volume fraction, the flexural strength of concrete improves obviously. On the basis of the experiment, the relationship formula of flexural strength and the cube compressive strength is given.
Numerical Simulation Study of Erosion for Fracturing Sandblasting in Elbow
Authors: Xu Bao Rui , Jiang Ming Hu , Zhao Li Xin , Tan Fang , Zhang Xiao Guang
Published: December 2014

Elbow as common components in the gas pipeline fails easily to natural gas carrying solid particle erosion in the process of practical work. From the viewpoint of hydromechanics, the paper analyses the flow field distribution of manifold pressure and gas-solid trajectory by using the Gambit model and Fluent software in view of the right-angle elbow and numerical simulation of the adjacent manifold. The result obtains the situation about the manifold inner wall by the solid particle erosion wear. The simulation results show more intuitively the elbow, the most prone to erosion part in the manifold adjacent area and shape in erosion. Meanwhile, the paper analyses the factors affecting the occurrence and development of erosion.
Preparation and Properties for Solid Solution Ce0.8Pr0.2-xNdxO2-δ(x=0.02, 0.05, 0.1)
Authors: Zhu Li Li , Lin Xiao Min , Qi Li Jing
Published: December 2014

Ce0.8Pr0.2–xNdxO2-δ(x = 0.02, 0.05, 0.1) solid solutions were synthesized by the sol-gel method. The XRD results show that all powders calcined at 800 °C are crystallized in a single cubic fluorite structure. The average grain sizes are between 20 nm and 25 nm. The Raman spectra analysis reveals that the solid solution Ce0.8Pr0.2–xNdxO2-δ has a cubic fluorite structure with oxygen vacancies. The oxygen vacancy concentration is increased by doping Nd in Ce0.8Pr0.2–xNdxO2-δ. Impedance spectra shows that the conductivity of rare earth co-doped ceria Ce0.8Pr0.18Nd0.02O2-δ is higher than that of single rare earth doped ceria Ce0.83Sm0.17O2−y. The results also show that Ce0.8Pr0.18Nd0.02O2-δ possess maximum conductivity. At 600 °C, the conductivity is 1.85×10-2S/cm, which is assigned to the higher oxygen vacancy concentration and the hopping electron transition of small polarons in the sample Ce0.8Pr0.18Nd0.02O2-δ.
Mass Concrete Crack Control Technology
Authors: Cheng Yu Lan
Published: December 2014

Combined with engineering examples, describes the reasons for the large volume of concrete cracks proposed comprehensive measures to control cracks from all aspects of mass concrete harmful cracks eliminate achieved remarkable results, for the future of similar mass concrete construction provides some guidance .
The Reasonable Amount of Polypropylene Fiber on Low-Intensity Manufactured Sand Concrete in the Case of Fixed Powder Paste
Authors: Lu Hao , Li Gu Hua , Yang Jia Wei , Zhang Liang , Sun Ze Jiang , He Jia Yin
Published: December 2014

Compared with the river sand, manufactured sand’s particle type and gradation is relatively poor and the surface is mat .The manufactured sand also has a big effect on the workability of concrete. In this paper,the Equivalent powder paste’s volume of manufactured sand concrete was determined according to Mehta and Aitcin’s ideas for the preparation of HPC,at the same time,the equivalent powder paste volume is assumed as the cement paste volume in the experiment. The influence of polypropylene fiber on Manufactured sand concrete’s workability and Compressive strength were researched in the case of fixed powder paste .