bluuebunny/crossref_metadata_2025 huggingface dataset:
Kinetics of the Reaction for Generation of Chlorine Dioxide from Sodium Chlorate and Hydrochloric Acid
Authors: Li Xin Jie , Jiang Dan Dan , Zhang Yue Jun
Published: March 2013

Based on the mechanism of ClO3-/Cl-reaction system, the kinetics for reaction of sodium chlorate and hydrochloric acid to generate ClO2was studied. The rate equation of this reaction system was deduced and simplified as a formula with mixed-order (combination of first-order and second-order) towards ClO3-. This rate formula indicates that the initial rate of the reaction is the first-order with respect to ClO3-, and the reaction rate is the second-order with respect to ClO3-when [ClO3-] becomes close to zero. The rate constants of the first-order were determined as 0.0168s-1(30°C), 0.0221s-1(40°C), and 0.0279s-1(50°C), respectively, and that of the second-order were obtained for 0.0019L·mol-1·s-1(30°C), 0.0028L·mol-1·s-1(40°C), and 0.0060L·mol-1·s-1(50°C), respectively. The results of statistic test prove that the rate formula obtained in this work is credible.
Preparation and Performance of Ni2P/TiO2-Al2O3 for Hydrodenitrogenation
Authors: Yan Jing Sen , Wang Hai Yan
Published: March 2013

A series of TiO2-Al2O3 composite supports were prepared by hydrolysis and deposition of tetrabutyl titanate on macropore Al2O3, and the nickel phosphide catalyst, Ni2P/TiO2-Al2O3, Ni2P/TiO2 and Ni2P/ Al2O3 were prepared by incipient wetness impregnation and in situ H2 reduction method. Their hydrodenitrogenation(HDN) performance were evaluated on a continuous-flow fixed-bed reactor by using quinoline as the model molecules . The results show that the TiO2-Al2O3 composite support still retained the pore properties of macropore Al2O3, and anatase TiO2 were well dispersed on the Al2O3 surface. Different supports had great influence on the reduction behaviour of the oxidic precusors and HDN activity of phosphide catalysts.The main active phase after reduction was Ni2P phase for the TiO2 supportd catalyst, but only Ni12P5 appeared for the TiO2-Al2O3 and Al2O3 supported catalyst. The TiO2-Al2O3 supported catalyst with the Ti /Al atomic ratio of 0.12 exhibited the highest HDN activity among all catalysts.
Studies on the Esterification Synthesis of Alkyl Oleates in Solvent-Free System by Candida Sp. Lipase
Authors: Zhong Hui , Fang Zheng , Zou Bao Hua , Li Xin , Guo Kai
Published: March 2013

The alkyl oleates were prepared by esterification of oleic acid with alkyl alcohols catalyzed by the lipase from Candida sp. 99-125 in solvent-free system. The influence of several factors, including enzyme concentration, temperature, molar ratio between oleic acid and alkyl alcohols and the structures of alcohols, was also investigated. The results indicated that the reactions catalyzed by lipase at 20 oC, in the presence of 5% (w/w) lipase, on the molar ratio of 1:1 between oleic acid and alcohols, afforded products in high yield and showed high selectivity to the alcohols with less hindrance on hydroxyl group. The lipase from Candida sp. 99-125 was identified to be an effective catalyst in the esterification of alcohol and oleic acid at low temperature.
Comparison of Electrochemical Behaviors of Chalcopyrite, Bornite, Chalcocite and Covellite in 9K Medium
Authors: Liang Chang Li , Xia Jin Lan , Nie Zhen Yuan , Luo Xian Ping
Published: March 2013

Electrochemical behaviors of chalcopyrite, covellite, chalcocite and bornite in 9K medium at 65 °C were compared in this paper to verify they whether or not the intermediate products of chalcopyrite. The results confirmed that bornite, chalcocite and covellite are the intermediate products of chalcopyrite. Chalcocite and bornite can both oxidize to covellite.
Preparation and Catalytic Performance of Ti(SO4)2/γ-Al2O3 Catalysts for Oligomerization of 1-Butene
Authors: Xiao Lin Jiu , Li Peng , Sheng Yong Gang
Published: March 2013

A series of Ti(SO4)2/γ-Al2O3 catalysts were prepared by impregnation method and the catalytic performance of these catalysts in 1-butene oligomerization was investigated. The heat treatment temperature played great influences on the catalytic performance of these catalysts in the oligomerization. 90.1 wt.% conversion of 1-butene and 92.2 wt.% selectivity of dimers were obtained on Ti(SO4)2/γ-Al2O3(450) catalyst at 80 °C, 1.0 Mpa and LHSV=0.6 h−1. The heat treatment temperature determined the crystallinity of TiOSO4 and specific surface area of these catalysts, which affected the catalytic performance of these catalysts in 1-butene oligomerization. In addition, the physicochemical properties of these catalysts were comparatively characterized by powder X-ray diffraction (XRD), N2 isothermal adsorption-desorption techniques.
Biodiesel Production from Silkworm Pupae Oil Using Solid Base Catalyst
Authors: Gu Shuang Shuang , Wang Jun , Pang Na , Wang Fang Qin , Li Cong , Wu Fuan
Published: March 2013

How to dispose large amounts of free fatty acids of the desilked silkworm (Bombyx mori L.) pupae oil in a suitable way have attracted considerable attention. The feasibility of biodiesel production from the desilked silkworm pupae oil using Na2O•SiO2•5H2O as a solid base catalyst was investigated, and the experimental conditions (i. e. molar ratio of methanol to oil, catalyst concentration, reaction time and reaction temperature) were studied. The experimental results indicated that Na2O•SiO2•5H2O possesses high catalytic activity towards the synthesis of biodiesel from the desilked silkworm pupae oil. The methyl esters conversion of up to 73 % for free fatty acids of the desilked silkworm pupae oil was achieved using the following reaction conditions: catalyst concentration 5 %, the molar ratio of methanol to oil 6:1, reaction temperature 70 °C, and retention time 8 h. Therefore, the desilked silkworm pupae oil is proved to be a new biodiesel source in a more sustainable way.
Conversion of Rice Straw to Bio-Fuel by Pyrolysis in Molten KCl-LiCl
Authors: Ji Deng Xiang , Cui Li , Huang Cheng Jie , Gao Ming Hui , Yu Feng Wen , Ai Ning , Ji Jian Bing
Published: March 2013

The objective of this study was to provide background date on rice straw pyrolysis in molten KCl(40mol%)-LiCl(60mol%). The effects of pyrolysis temperatures and sweep gas flow rates on the pyrolysis products yields and their chemical compositions were studied. The temperatures of pyrolysis and sweep gas flow rates were varied in the range of 380°C -540°C and 60L/h-260L/h, respectively. The compositions of gaseous products were analyzed by gas chromatography, and that of bio-oil obtained was investigated using gas chromatography-mass spectroscopic(GC-MS) technique. The yield of gaseous products increases with the increasing temperature, the char yield has demonstrated a downtrend, and the maximum yield of bio-oil is up to 15.43 wt.% at 460°C. The yield of char decreases with the sweep flow rate, the gaseous has a minimum yield at 100L/h, and the maximum yield of bio-oil is 15.43wt.% at 100L/h .The main gaseous products are CO, CO2 , H2 and CH4. Ketones and phenols are the main compounds in the bio-oil, the presence of molten inhabites their formation, and promotes the production of furfural. The bio-oil attained from pyrolysis is a potential source of renewable fuel and chemical feedstock.
Effect of Secondary Pore Distribution on Adsorption Rate and Stability of Molding 5A Zeolite
Authors: Tang Yun , Du Xu Dong , Cun Qun
Published: March 2013

Equilibrium adsorption capacity and adsorption rate of n-hexane on 5A zeolites(A-1~A-3) were measured by gravimetric method. The carbon depositions after intensification were studied by TG-DTA. Results show that secondary pores of A-1~A-3 distribute in 0.01~0.5μm, 0.05~5μm, 0.01~0.05μm. A-3 has the minimum average pore size and pore volume .The diffusion time constant of n-hexane on A-1 and A-3 are 4.004×10-4, 2.038×10-4s-1, are 14.8 and 7.5 times that on A-2, respectively. The decay rate of n-hexane adsorption capacity and the coke deposition amount on A-1 are 28% and 0.06% less than these on A-2, while the both on A-3 are the smallest (41% and 6.67%), after five times intensification under industrial hexane at 400 °C. Appropriate adjustment of secondary pores of 5A zeolites, to raise the proportion of the pores about 0.01 ~ 0.05μm, can improve diffusion rate of adsorbates, adsorption stability and service life of 5A zeolites.
Facile Preparation of Biodiesel Using Microwave Heating
Authors: Song Li Hua
Published: March 2013

The preparation of biodiesel using a scientific microwave apparatus offers a fast, easy route to this biofuel with advantages of a short reaction time, a low oil/methanol ratio, and an ease of operation. The methodology can be utilized with new or used vegetable oil and with methanol or ethanol with a 1:6 ratio of oil/alcohol.
New Mechanism of Saving Energy and Reducing Pollution in Burning Processing of Emulsified Oil
Authors: Tian Yuan Yu , Qiao Ying Yun
Published: March 2013

A new mechanism of saving energy and reducing pollution is brought forward by analyzing water characters in high temperature condition and all factors which bring saving energy and reducing pollution in the combustion process of emulsification oil. The theory shows that the reason of saving energy and reducing pollution is that emulsification oil can reduce surplus air ratio effectively in the combustion process. These reasons include that of improving the burning flame temperature, avoiding the local super-high temperature, decreasing the amount of NOX and the conversion of SO2 oxidize to SO3, strengthening the burning and heat transmission and reducing the soot of the flue gas.By this new theory, the reasons of saving energy and reducing pollution in the combustion process of emulsification gasoline, emulsification diesel oil, emulsification heavy oil and other slurry fuel of W/O or O/W can be well explained. At the same time, the new mechanism was well validated in the combustion process of hard asphalt water slurry.
KF/Al2O3/Ceramic Membrane Catalyst for Biodiesel Production
Authors: Xu Wei , Jiang Feng , Gao Li Jing , Xiao Guo Min
Published: March 2013

In this work, γ-Al2O3coated ceramic membrane (CM) was prepared by dip-coating technique and used as a catalyst support for biodiesel production. The effects of the properties of the slurry were investigated on the γ-Al2O3coating. KF/Al2O3/CM was prepared by γ-Al2O3/CM impragnated with KF solution. The samples were studied in the transesterification of palm oil with methanol. Experimental results showed that the solid content and density of the aluminum sol had significant influences on the amount and stability of the γ-Al2O3coating. KF/γ-Al2O3/CM showed a high activity and reusability in the transesterification. This work provided a way to prepare alkaline ceramic membrane which can be used in the membrane reactor to produce biodiesel.
Strategy for Renewable Energy Development in Rural Areas of Beijing
Authors: Zhou Zhong Ren , Zhou Lian Di , Su Di Tang
Published: March 2013

Beijing has long attached great importance to the development of renewable energy in its rural areas. On the basis of an analysis of resources, history, and status, this study presents a strategy for developing renewable energy in rural Beijing. Namely, for Beijing to become a high-level demonstration zone for renewable energy use, it must grasp two key development links (renewable energy and energy saving), focus on three strategic emphases (solar energy heat utilization, biomass gas, and energy-saving housing renovation), and enforce six construction elements (e.g., product research and development, technology upgrades, demonstration zones, and service systems). We also introduce concrete measures for promoting the development of rural renewable energy in Beijing in terms of funds, markets, policies, technologies, and services.
The Influence of Extraction on the Thermal Performance of Coal in Inner Mongolia
Authors: Zhang Hong Liu , Chen Gang , Xia Peng Fei , Zhao Quan
Published: March 2013

Five different solvents are adopted to abstract the raw coal in Inner Mongolia. Meanwhile, different solvent-residues are tested by smart testing machine about their ash fusing point and the residues are analyzed by X-ray diffraction (XRD) .As is shown that the means of solvent-abstraction can effectively alter the coal ash fusing point in Inner Mongolia. Besides, it can improve the calorific capacity of the coal. Thus, it can improve the thermal property of coal, it can reduce the pollution of the environment.
Hydrolysis of Cellulose to Produce Glucose in Ionic Liquid-Water Mixtures
Authors: Xu Tian Jiao , Chen Jin Yang , Ji Yi Mei
Published: March 2013

The lignocellulose is a widespread renewable resource. With the decrease of the petrochemical resources, lignocellulose is very important as an alternative resource to produce fuel ethanol. As for the conversion of cellulose into fuel ethanol, the saccharification of cellulose is a key process. The environment benign process using ionic liquid-water mixtures is studied to mild hydrolysis of cellulose to glucose without acid as catalyst. Ionic liquid of 1-allyl-3-methylimidazolium chloride ([Amim]Cl) is chosen to mix with water because it has great solubility of cellulose. The mass ratio of water with ionic liquid, reaction temperature and reaction time are studied and the optimal conditions of glucose yield are obtained as follows: the mass ratio of water 0.375, the reaction temperature 433 K and the reaction time 4h, and the yield of glucose is 77.08%.
Chemical Constituents and Anti-Acetylcholinesterase Activities of Dolomiaea wardii
Authors: Li Chun Lei , Sheng Jie
Published: March 2013

The chemical composition of the ethyl acetate and n-butanol extracts of Dolomiaea wardii has been reported for the first time in the present study and eight compounds were isolated and identified as corymbolone(1), encelin(2), 8-oxoargentone(3), betulinic acid(4), lupeol(5), 4-hydroxyacetophenone(6), sweroside(7), Laganoside(8). anti-acetylcholinesterase activity of 1-8 showed that compound 6 have weak inhibitory activity with IC50 value of 1.43 mM.
Chemical Constituents of Euphorbia altotibetica
Authors: Yang Ai Mei , Li Hui , Liu Jie Li , Guo Wei Jie , Wu Rui
Published: March 2013

Nine compounds were isolated from the petroleum ether extract of Euphorbia altotibetica. The structures of these compounds were elucidated as: squalene (1), β-sitosterol acetate (2), 11, 15, 19, 23-tetramethy-5, 9, 17-tetracosatrienoic acid (3), physcion (4), (z)-10-nonadecenoic acid (5), (z)-4-undecenoic acid (6), β-sitosterol (7), (24S)-stigmastan-4-en-3-one (8), naringenin (9). These compounds were identified on the basis of comparing their NMR datas with those of corresponding compounds in the literature.
Investigations of the Isotropic G Factors for the Cubic Fe+ Centers in LiF and NaF
Authors: Hu Xian Fen , Wu Shao Yi , Kuang Min Quan , Song Bo Tao
Published: March 2013

The g factors for the cubic Fe+centers in LiF and NaF are theoretically investigated from the perturbation formula of the g factor for an octahedral 3d7cluster including the contributions from the ligand orbital and spin-orbit coupling interactions. The increasing order of the g factor (i.e., LiF < NaF) can be ascribed to the decrease in covalency and the strength of cubic crystal-field of the systems. The validity of the results is discussed.
Crystal Structure, Antimicrobial Activity and Oxidation Resistance of N,N′-Bis(4-hydroxybenzyidene)azine
Authors: Li Dong Qing , Luo Xu Jian , Tan Mian Jia
Published: March 2013

In the paper, N,N′-bis(4-hydroxybenzyidene)azine (BHBYA) has been synthesized by p-hydroxybenzaldehyde and hydrazine as raw materials. The structure was determined by X-ray diffraction. The Schiff base crystallizes is in the monoclinic P21/c space group. The results of antimicrobial activity showed that it has a good inhibition on Cucumber Damping-Off and Rice Blast. The findings of oxidation resistance experiment indicated that it has an excellent inhibitory effect on peroxidation of olein.
Docking Studies on a Series of Novel Potent BRAF Inhibitors
Authors: Yi Ping , Yang Jin , Huang Du Shu , Liu Wei , Wu Na , Feng Shao Ping , Pan Qing Shan , Wang Ze Feng , Min Yong
Published: March 2013

BRAF, a serine/threonine specific protein kinase that is part of the MAPK pathway and acts as a downstream effector of RAS, is a potential therapeutic target in melanoma. We have studied a series of small-molecule BRAF inhibitors based on a 1H-imidazo[4,5-b]pyridine-2(3H)-one scaffold (ring A) as the hinge binding moiety and a number of substituted phenyl rings C that interact with the allosteric binding site. Based on molecular docking obtained by using GOLD, the interaction models on the receptor site of BRAF are guiding the design of potential inhibitory structures directed against BRAF activity.
Dynamic Absorption and Desorption Properties of HPD722 Macroporous Resin for Flavonoids in Emilia sonchifolia Extract
Authors: Wang Li Sheng , Liu Wen Jia , Zhang Yan Hua , Pang Li , Li Xuan Hai
Published: March 2013

The impact of HPD722 macroporous resin on the dynamic adsorption and desorption of flavonoids in Emilia Sonchifolia extract is studied. The diameter-height ratio of macroporous resin column is 1:10; the mass concentration of the sample solution is selected to be 50.00 mg•mL-1; while the sample flow rate is 3.00mL min-1; upon dynamic absorption for once, the absorption rate reaches 81.11%; with adoption of 50mL ethanol at a volume ratio of 60% as the desorption agent, the desorption flow rate comes to 3.00mL•min-1; and the desorption rate of flavonoids attains 85.26%. Under optimal conditions, the content of flavonoids increases from 6.05% to 32.65% upon purification by HPD722 macroporous resin.
Effect of Formula on Microcellular Unsaturated Polyester
Authors: Zhao Xue Ni , Zhai Peipei , He Jianpeng , Ren Wei
Published: March 2013

Formula for microcellular unsaturated polyester using chemical foaming method was studied. With the increase of NaHCO3 content, the cell size of microcellular unsaturated polyester slightly decreased with the increase of styrene content in the range of 1-2 %. The cell size increased in the range of 2-4 %. With the increase of curing agent content, the cell size increased in the range of 0.5-0.9 % and decreased in the range of 0.9-1.3 %. The cell size decreased with the increase of styrene content in the range of 30-40 %. The cell size had little variation when styrene content was in the range of 40-50 %. The average cell size and cell density of microcellular unsaturated polyester were strongly affected by accelerant content. The cell size decreased with the increase of accelerant content. The opposite was for the cell density. The microcellular unsaturated polyester prepared at 2% NaHCO3, 0.3% accelerantt, 0.9% curing agent, 40% styrene had the small cell size, high cell density, and strong compression strength.
Effect of Sodium Ion on Flame Retardance and Thermal Degradation of Cellulose Fiber
Authors: Xu Dong Mei , Ji Quan , Quan Feng Yu , Ma Xiao Mei , Xia Yan Zhi
Published: March 2013

Flame retardance and thermal degradation of CMC-Na fibers were investigated using limiting oxygen index (LOI), thermal gravimetry (TG), differential TG (DTG) and Scanning electron microscopy (SEM). The LOI values of different CMC-Na fibers are 23, 26, 28.5, 31 and 34, compared with about 20 for viscose fiber. TG and DTG studies indicate that the temperature of maximum degradation rate and the maximum degradation rate for CMC-Na fibers are much lower than those of viscose fiber. However, CMC-Na fibers generate much more residues or carbonaceous char than does viscose fiber. The increase of sodium ion content, the carbon residual also increases. SEM studies of combustion residues after LOI testing indicate that all CMC-Na fibers produce intumescent, hard and brittle residue crusts.
Effect of Silane Coupling Agent on the Self-Cleaning Property of TiO2-Coated Cotton Fabrics
Authors: Wu De Yong , Wang Lian Zhi
Published: March 2013

Self-cleaning fabrics have been successfully prepared by depositing and grafting TiO2 nanoparticles, and silane coupling agent 3-Aminopropyltriethoxysilane was adopted to improve the photocatalytic activity of self-cleaning fabrics. TEM results showed that the treatment of silane coupling agent is good for increasing the amount of TiO2 particles. The excellent photocatalytic activity of TiO2-coated cotton fabrics is attributed the increase of TiO2 particles and the formation of the TiO2/SiO2 structure.
Expressing Xylanases in Escherichia Coli by Cell Surface Display
Authors: Zhao Mei Na , Zheng Zongbao , Chen Tao
Published: March 2013

In this research, xylan was utilized by a recombinant whole cell biocatalyst, which was developed by expressing three xylanases — β-xylosidase, endoxylanase, and α-arabinofuranosidase — on the surface of the E. coli BL21 (DE3). The xylanases were displayed on the surface of the cells by fusing with anchor proteins, Blc. The assimilation of xylan by cell surface display was the first step in the consolidated bioprocessing (CBP). This result shows that the engineering strains could be endowed with the ability to assimilate xylan. The co-display engineering strains utilized xylan and expressed less metabolic burden than the engineering strains secreting extracellular xylanases.
Extraction of Hemicellulose from Sugarcane Bagasse under Microwave Radiation
Authors: Wang Li Jun , Liu Xin Liang , Weng Meng Ling , Wu Fu Sheng , Li Zhou Jun , Wang Shuang Fei
Published: March 2013

Extracion of hemicelluloses from sugarcane bagasse under microwave radiation was studied in this paper. The effects of liquid to solid ratio ( V ( water ) : m ( stover ) ) , alkali consumption ( m( NaOH): m ( stover ) ) , time, microwave power, and temperature on the extraction yield of hemicelluloses were investigated. The optimal parameters were: liquid to solid ratio of 25, alkali consumption of 2.0, time of 20 min, and microwave power of 1200 W. The obtained hemicelluloses was qualitatively analyzed by gas chromatography, and results showed that prepared hemicelluloses is a kind of xylan hemicelluloses, mainly consisting of simple sugars like D-xylose, D- arabinose, L- arabinose, D- galacturonic acid, D-galactose and D-mannose.
Kinetic Models of Hydrogen Production Process by Batch Anaerobic Fermentation from Contained Sugar Wastewater
Authors: Sun Dong Gou , Huang Bing , Zuo Wen Gang , Zhao Huai Yuan , Wei Wen , Deng Jing
Published: March 2013

The processes of biomass growth, hydrogen production and sucrose degradation were systemically investigated about batch anaerobic fermentation which is based on activated sludge for a basic strain and the simulating sucrose wastewater for a substrate. The kinetics of microbial growth, hydrogen production and sucrose degradation were proposed according to the Compertz equation and the Luedeking-Piret equation. The relationship between the biomass, hydrogen and substrate were also evaluated. The results shown that the hydrogen is a main produce of the formation process which is a growth-associated, a high biomass is favorable to increasing the hydrogen yield and shortening lag time. The three kinetic models equation have a good coincidence with the experimental data, and can really reflect the hydrogen production process from wastewater contained sucrose. The results will provide helpful reference for the large-scale production and theory study of hydrogen production.
Numerical Analysis on Seismic Performance of Beam-Column Joints Strengthened by Top and Seat Angles in the Added-Storey Steel Frame
Authors: Yang Ya Long , Yao Yong , Chu Yun Peng , Pei Chao Wu , Deng Yong Jun
Published: March 2013

Based on the ANSYS platform, set up five finite element models of beam-column joints strengthened by top and seat angles, analysis its seismic performance and discuss how the width and thickness of the angle affect it. The results showed that: (1) Strengthened by top and seat angles can effectively reduce the stress of the weld in the column, relocated the plastic hinge, increased the ductility and the energy dissipation capability of the structure. (2) As the width and thickness of the angle increase, the bearing capacity of the joint improved, but its hysteretic behavior and energy dissipation were decreased.
Research on Machanical Behavior of T-Shaped Concrete-Filled Steel Tubular Stub Columns with Steel Bone
Authors: Ju Kai Lin , Li Qiu Sheng , Du Guo Feng , Li Yi
Published: March 2013

Concrete-filled steel tube structure is one of the important load-bearing systems of modern high-rise building.The research indicate that concrete-filled steel tube structure has a good static and seismic performance,and concrete-filled steel tubular component is always used as axial compression and compression-bending component.However,what about the mechanical behavior of this combinational structure (concrete-filled steel tubular columns with steel bone built-in)? So there is a new type of special-shaped cross-section of composite structure,that is the T-shaped concrete-filled steel tubular columns with steel bone.The research about this structure is less throughout domestic and foreign.So the axial compressive experiments of six T-shaped concrete-filled steel tubular stub columns, five with and one without steel bone, were carried out. The effects of tube confining factor, bone indicator on the axial compressive behavior of the columns are analyzed. Experimental results indicate that the ultimate strength of the T-shaped steel tubular stub columns with steel bone increases, can be increased by 71.7%.And that the setting of steel bone improves the confinement of the concrete core, delays or even avoids the local buckling of the steel tube before the stress attains the yield strength. The ductility of the columns is also greatly increased.And at last in this paper, use of static equilibrium conditions and limit yield conditions,and in reference to literature[1],the calculation equation of compression capacity of this combinational column is derived.Moreover,calculation results according to the formula in this paper are in good agreement with the experimental results. The conclusions might be used as reference to structural design and plan.
Study on the Influences of Wind Mode and Layers to Concrete Column Confined by GFRP
Authors: Liu Ya Nan , Liu Hua Xin , Wang Xue Zhi , Li Lei
Published: March 2013

To study the mechanical property of concrete column confined by GFRP, we conducted 6 groups of specimens under axial compress. The influences of GFRP wind mode and layers were taken into account. According to the results, bearing capacity and ductility of the spiral winding specimen was improved greatly. The bearing capacity of the 6° spiral winding concrete column’s improvement is 28%, more than it of 0°. The fiber polymer’s utilization ratio can be improved greatly when column were combined with all spiral wind. Strengthen the concrete column of ±15°cross spiral winding pretend to be stronger capacity of bearing axial press than it of 6° spiral winding, but limiting strain tends to be lower. Shearing crack often happens at the 45°of the specimen, so shearing failure can be prevented effectively by GFRP (45°).Effective deformation and strength can be provided by FRP at the direction of axial and circular, and the reinforcing steel bar in concrete column can be substituted partially.
Remote Hybrid Testing of Asymmetric Structures under Earthquake Excitation
Authors: Fan Yun Lei , Xiao Yan , Guo Yu Rong , Yuan Tao
Published: March 2013

Based on the pseudo-dynamic testing method and substructure technique, a remote hybrid dynamic testing method for asymmetric-plan buildings considering torsional effects is described. Besides, this paper presents the method and control principle for testing substructures in a single-story frame system under loading due to eccentric lateral responses of superstructure to earthquake motion. Several validated simulation tests of an asymmetric bridge system have been conducted successfully based on the remote testing platform NetSLab and the crossed-response of torsional and translational vibration of bridge structures under three representative ground motions was studied.
Fire Response Calculation Based on Damage Mechanics
Authors: Tang Song Hua , Luo Ying She , Yin Shui Ping , Li Yong Hong , Chen Chao , Tian Fang
Published: March 2013

Damage mechanics is introduced into the fire response calculation of the concrete structure. The damage mechanics equations for fire response calculation are established. They are the damage evolution equation based on “residual strength” theory, heat conduction equations, and elastic mechanical equations. The fire response calculation of a concrete slab under external load and fire is shown. ANSYS is selected for calculating. The temperature field and stress field are obtained, the damage and failure process are described using the technique of killing or activating elements in ANSYS, and the fire resistance of the slab is obtained.
Study on Dynamic Field of Project Organization
Authors: Qu Na , Qu Dao Lai , Liao Zhi Rong
Published: March 2013

First of all, the paper introduces the concept of "field" in physics, constructs conceptual model and structural model of "dynamic field "to illustrate the role of evolution dynamic played to the participants in a project organization. On this basis, it constructs the field force function model of dynamic field, analyzing the field force after the dynamic factors coupled, and finally puts forward the working methods of the "dynamic field" of an organization and the conditions that the "dynamic field" of an organization can work better .
Engineering Application of External Prestressing Curved Beam
Authors: Huang Min Yuan , Zou Zong Ren
Published: March 2013

Using the finite element software ANSYS to analyze dynamic characteristics of external prestressing structure, reasonable control parameter, as well as external prestressing reinforcement joints of security, the main research contents and results are as follows: Dynamic performance analysis is about variation law and internal feature. With the increase of external prestressing, on the contrary, the natural vibration frequency will reduce. However, external prestressing effects on the structural dynamic performance improvement that is not obvious in general. Based on sensitivity analysis, control parameter of external prestressing reinforcement curved beam must be analyzed and the reasonable value range of sensitive control parameter can be found. For the control parameter of external prestressing process, its reasonable control parameter’s range should be about 6% in the theoretical calculation. While simulating of anchoring system, local force on anchoring system must be analyzed finely and accurately. A comprehensive understanding should be mastered on variation law, which is about the internal forcing and stress response of special area. The setting of anchoring device shall be arranged at 1/3 place of original prestressing position. To ensure the safety, it should guarantee the mechanical continuity of anchor joints.
An Experimental Study on Thermal Insulation Performance of Straw Wire Aircraft Sandwich Panel
Authors: Huang Qun Yi , Xiong Feng , Fan Kui , He Yu Chuan
Published: March 2013

Straw wire aircraft sandwich panel is a new type of composite slab which consist of straw insulation core lamped between two welded wire meshes. Diagonal shear connectors connect two wire meshes to form an integrated frame. The straw insulation core (also known as straw board) is prepared from cut straw agglutinated by magnesium oxychloride cement (MOC). In order to study thermal conductivity of straw board, multi-group models were quantitatively investigated by the CD－DR3030A thermal conductivity meter. Five parameters, including the water－cement ratio, cement content, straw gradation, straw length, wettability were considered in the test. The results show that the thermal conductivity of straw board samples is in the range of 0.08~0.12 w/m•k, which indicates that the straw board has a good thermal insulation property. And the water－cement ratio, cement content, straw gradation, straw length, wettability has remarkable effects on the thermal conductivity of straw board.
Integrated Light Steel Structure Housing: A Low Carbon Housing Structure System of High Durability
Authors: Shen Liang Feng , Song Tian Ping
Published: March 2013

From the analysis of several typical phenomenon of “false low carbon”, the only way of achieving low carbon and sustainable development for the housing industry with industrialization and integration has been put forward, so as to clear the basic connotation of the integrated manufacturing house in factory, and the integrated housing development progress and the trend have been pointed out in this paper, too. Then based on the analysis of characteristics of the integrated light steel housing structure and facing its development obstacles, some specific solutions have been put forward in the end.
The Dynamic Performance and Stability Analysis of Prestressed Arch-Supported Net Shell Structures
Authors: Jin Yu , Yi Wei Jian , Hu Lan
Published: March 2013

Based on the structural features of net shell and prestressed arch structures, prestressed arch-supported net shell structures have been developed as a new large space structural system. Dynamical performances and stability of a real prestressed arch-supported net shell structure are analyzed in this paper by using ANSYS. The structure vibration frequency and natural conditions are extracted using dynamical modal analysis method. Because of the bigger ratio between the span and the thickness and smaller critical load values, significant stress advanced phenomenon of some truss bars will appear in the influence of construction when prestress cables are introduced to the space structures (especially for the combination of truss arch and net shell). These effects will make link nodes keep certain stress. Literature survey shows that the research on how the residual stress influences the stability of the structure is very still insufficient. Therefore, the overall stability analysis of the prestressed arch-supported net shell structure is very necessary. The result of research shows that the vibration frequency of prestressed arch-supported net shell structures is enhanced continually with the stronger overall stiffness. Vibration models are significantly different for diverse different structure forms. Result of this study also shows that the stress makes the buckling ultimate load of prestressed arch-supported net shell structure be improved markedly and the stability of prestressed arch-supported net shell structure be enhanced. As a result, the overall performance of this new hybrid structure system is better and it has a certain application prospect.
Parameter Analysis for the Beam-to-Column Minor Axis Connections of Steel Frames
Authors: Hu Xi Bing , Chen Da , He Guo Jing
Published: March 2013

Base on the traditional assumption, beam-to-column minor axis connections are usually considered either as perfectly rigid or as nominally pinned. In fact, many researches show that beam-to-column minor axis connections are often semi-rigid, and their performance greatly effects the internal force, displacement, and ultimate bearing capacity of the steel frames, which cannot be neglected. Welded joint, one type of beam-to-column minor axis connections, which is widely used in the engineering practice is researched. The finite element method was used to analysis the relationship between the parameter variation and the rotational initial stiffness of the connections. The results can be used as a reference to the designs of steel frames.
Design of Reinforced Concrete Block Masonry Basement
Authors: Quan Hong
Published: March 2013

Common concrete miniature hollow block masonry is the main promotion material in wall materials reform of China. The paper presents the structural design and the calculation process of the tall building wall emphatically. It meets the specification. The design can be used as a reference to similarity engineering.
Design and Spread Analysis of a New Deployable Bridge Section
Authors: Yuan Duan Cai , Hu Qi Gao , Sun Guang Xu
Published: March 2013

For the volume of the new prefabricated bridge with integral structure is huge and transportation and storage are difficult, scissors mechanism driven by hydraulic cylinder is presented to bridge design. Wth theoretical analysis, the position of the node, velocity and acceleration are analyzed. Using the ADAMS software, the whole model of deployable bridge section is established. The multi-body dynamic simulation of the whole model is studied. The simulation results are compared with those of theoretical analysis. The maximum error of them is 2.26%. The methods and conclusions are available for the design of developable bridge section.
An Application of Comprehensive Geological Prediction Methods in a High-Speed Railway Tunnel
Authors: Yin Peng , Yao Rui Ting , Ji Xiao Lei
Published: March 2013

The tunnel involved in this study is a double-track tunnel with a 4113m length and 390m maximum depth which is currently under construction. By analyzing the specific engineering geological and hydro geological conditions and summarizing the past geological prediction techniques, the comprehensive geological prediction methods are adopted in the project, and the accuracy and feasibility of the theory and techniques are verified in the practical construction process. It is concluded that the comprehensive geological prediction methods are conducive to reduce the risks, accelerate the schedule and guarantee the quality of the construction, and provided a good guidance and reference for the tunnel constructions of this kind
Research on Rheological Properties of Room-Temperature Curing Epoxy Adhesive
Authors: Li Hui , Luo Ying She , Xie Jian Jun , Chen Sheng Ming
Published: March 2013

The rheological mechanical properties of two kinds of self-designed epoxy adhesive curing systems were studied in this paper through the dynamic and static thermodynamics instrument named EPLEXOR 500N made by GABO® company in Germany. Short-term creep tests were carried out under three different temperature conditions of 20°C, 30°C and 40°C and the rheological model is developed to describe the materials creep law. In addition, the test results from the two different epoxy adhesive are also compared and analyzed.
Effects of Mineral Admixtures and Superplasticizer on Controlling Hydration Heat of Cementitious Materials
Authors: Huang Qing , Yin Jian , Song Wei Min
Published: March 2013

The effects of mineral admixtures and superplasticizer on reducing the hydration heat of cementitious material were evaluated in this study, and the heat evolution rate and hydration heat were tested as the two parameters to evaluate the effect of improvement. The results showed that the cement partly-replaced with fly ash (FA) and slag (SG) could significantly decrease the release rate of hydration heat on the early stage of hydration, and lower the peak value of the heat evolution rate. The superplasticizer (TJ-Ⅲ) could reduce the hydration heat mainly on the early stage of hydration, and extended the induction period. In comparison with slag, the fly ash had more active effects on reducing the peak value and release rate of hydration heat.
Modeling Analysis of Crack Repairing Structures for Asphalt Concrete Pavement
Authors: Chi Yi , Yin Jian
Published: March 2013

Crack is one of the major distresses in asphalt concrete pavements, which could significantly reduce the safety and amenity of driving, even the performance of the whole pavement structure. By means of diverse crack repairing manners, the durability and whole service life of the pavement can be improved and extended. After repairing, a composite structure of the repairing system is formed which consists of new crack filling materials and original asphalt concrete matrixes. In order to resist the external loads on the pavement, the composite structure mush work as an integrated structure and maintain sufficient adhesive strength. Therefore, the deformation compatibility of the composite structure is the vital performance for the stability and durability of the entire repairing system. In this study, a modeling analysis for the composite structure under various service conditions was carried out utilizing MIDAS software. The vertical and transverse deformation, transverse and longitudinal normal stress were analyzed by simulating the composite structure under several serving conditions. Based on the results，it was found that the strain, stress and related properties of the repair material and asphalt concrete matrixes could meet the requirements for an asphalt concrete pavement, and the compatibility of the composite structure was also satisfactory.
Analysis of Concrete Performance Used for Non-Ballasted Track Base Plate Based on the Coupling of Effect of Acid and Carbonization
Authors: Yin Jian , Zhang Xian Chao , Chi Yi , Pang Qi Ling
Published: March 2013

Combining Shi Wu Passenger Dedicated Line and considering the effect of variety and content of mineral admixtures on concrete performance, the paper has investigated the microscopic structural’s variation of C40 high performance used in non-ballasted track base plate under the coupling conditions of acid rain and carbonization by using micro-testing methods such as SEM and XRD and optimizing mix design.The effect of variation on concrete performance has also been analyzed. Results show that when the concrete was eroded in coupling conditions of acid rain and carbon corrosion, C40 high performance concrete specimens produced a certain amount of acicular and columnar ettringite, the surface structure was loose, and pore increased, in addition, plate Ca(OH)2 crystal content gradually decreased with increasing of age, the concrete strength decreased, the maximum reducing value reached to 27%, what's more, the depth of neutralization increased with age. For different erosion pattern, its influence law was: S mode＜ST mode＜TS mode＜T mode.
The Influence of Mineral Admixtures on the Wear-Resisting Property of Recycled Aggregate Concrete
Authors: Chen Wei Dong , Yin Jian , Song Wei Min , Chi Yi
Published: March 2013

It was tested the strength and wear value of recycled aggregate concrete mixing fly ash, slag, silica fume and double-mixture or three-mixture in deferent age. The results show that the wear value of recycled aggregate concrete mixing 30% fly ash is more than reference concrete at 3days, but can improve final wear-resisting property significantly. The wear value of recycled aggregate concrete mixing 30% double-mixture of fly ash and silica fume is much lower than reference concrete at 3days, and improve early wear-resisting property significantly. The flexural strength of the concrete is 4.26MPa at 3days, which can satisfy the traffic requirement. The wear value of recycled aggregate concrete mixing 30% three-mixture of fly ash, slag and silica fume is lower than reference concrete at 3days, but the declining rate is not significant. It investigates mechanics of double-mixture technique which improves wear-resisting property at the same time.
Static and Dynamic Behavior of the High-Pier and Long-Span Continuous Rigid Frame Bridge
Authors: Liu Jian Xin , Wang Ying , Zhu Mei Chun , Zhang Zhi Hong , Zhang Xin Hua , Guo Jian Hong , Li Pei , Tang Wen
Published: March 2013

A structure model of three-span continuous rigid frame bridge was constructed based on the finite element method. Firstly, the static performances were obtained. Secondly, the modal analysis was performed to get the natural frequencies and periods. The dynamic characteristics of the bridge structure were summarized, and some improvement guidelines are suggested to overcome the shortcoming for the bridge structure. Then, seismic response analysis was carried out based on the EL-Centro wave. The input excitations adopted the combination of vertical wave plus longitudinal wave, or vertical wave plus lateral wave, or the combination of three directions. Based on the three excitation cases, some useful results were obtained, which include internal forces, displacements, accelerations time-history curves of the critical sections for the bridge structure. And some comments about the time-history curves are given. At last, some helpful conclusions are drawn based on the calculation and analysis above. The calculation methods and results in this paper can provide some referenced information for the engineering design.
Numerical Simulation of Atmospheric Flow Field around Highways
Authors: Jia Ying , Zheng Chao Chao
Published: March 2013

The construction of highways has changed the state of the atmospheric flow field around this area. Adopting the model of SST k-ω，this paper carries out a numerical simulation of the atmospheric flow field around the highway. The affected area of highways with different parameters on surrounding atmospheric flow field and the altered state of flow filed are studied.
Analysis of Interference Effects of Adjacent Buildings on Wind Pressures
Authors: Zhang Ai She , Gao Cui Lan , Zheng De Qian
Published: March 2013

This paper presents numerical and experimental investigations of wind-induced interference effects on the pressure distributions on an adjacent building. The relative locations of the interfered building model and the interfering model are sited in staggered arrangement. The wind tunnel tests were carried out in a low-speed boundary layer wind tunnel. The numerical predictions for pressure distribution on the principal building are performed by solving the Reynolds-averaged Navier–Stokes (RANS) equations using the renormalization group (RNG) k–e turbulence model and then compared with the measurements. The RANS equations are solved by the pressure correction procedure of the SIMPLEC method. The simulated pressure, base force and base moment coefficients in different wind directions are generally in good agreement with the corresponding wind tunnel data. It is also found that the wind pressures, base forces and moments on the testing building are affected to some extent by the interference from adjacent buildings. The numerical simulation applying the SIMPLEC method using the QUICK upwind scheme and the RNG k–e turbulence model seems to be a useful tool for the predictions of wind pressures, and especially the wind forces acting on a building with an adjacent building.
An Experimental Study on the Creep of FRC Sub-Base for Pavement Using a New Testing Device
Authors: Jung Woo Tai , Choi Sung Yong , Park Young Hwan
Published: March 2013

The hydraulic loading device commonly used for creep test necessitates continuous recharge of the hydraulic pressure with time and is accompanied by slight variation of the permanent load at each recharge. Therefore, accurate test results cannot be obtained for long-term creep tests requiring time-dependent behavioral analysis during more than 6 months. This study conducts creep test as part of the analysis of the long-term characteristics of fiber-reinforced lean concrete sub-base of pavement. The creep test is executed using the new load-amplifier device not a conventional loading device. Since the results of the preliminary verification test on the new creep test device show that constant permanent load is applied without significant variation, it can be expected that more accurate measurement of the creep will be possible in a long-term compared to the conventional hydraulic device. In addition, the creep test results of sub-base specimens reveal the occurrence of large instantaneous elastic strain, differently from the strain curve observed in ordinary concrete, as well as the occurrence of small creep strain leading to low creep coefficient.
Applicability Analysis of the Dynamic Test Method to the Frequency
Authors: Meng Xiao Yun , Ma Fu
Published: March 2013

Calculate and analyze the frequency of the simple box girder based on the unfinished Ba gong River Bridge. The frequency values which were obtained by dynamic test method and theoretical analysis method were compared in this paper. The results showed that the measured values of dynamic test method are close to the results of theoretical analysis, the error is within permissible range, so dynamic test method is suitable for measuring the frequency of simply-supported box girder.