bluuebunny/crossref_metadata_2025 huggingface dataset:
Researches on the Fixation Performance of Chitosan and its Derivative
Authors: Lei Ning Ning , Zhong Na , Shi Yi Dong , Ling Xiao Rui
Published: June 2012

The fixing performance of chitosan hydrochloride (CSH) with different molecular weight and chitosan biguanide hydrochloride (CSGH) as a fixing agent for cotton fabric dyed with reactive dyes was discussed. The results showed that the fixing effects of CSH on reactive dyes were related to its molecular weight, and the CSH with high molecular weight (HMW) exhibited better fixing effects than that with low molecular weight (LMW). The fixing effects of CSGH on reactive dyes were superior to that of the CSH with HMW, because of the CSGH molecule with positive charges and the imino groups, which could further strengthened the interaction among the CSGH, dyes and cellulose molecules. After treated by the CSGH, the soaping, perspiration and dry rubbing fastness of the dyed fabrics could be increased 0.5 to 1 grade, while the wet rubbing fastness of ones was also improved obviously. The infrared spectrum (FTIR) of the dyed fabric treated by CSGH showed that a cross-linking was formed among CSGH, dyes and cellulose molecules.
DFT Study on Structures, Stabilities and Electronic Properties of Tert-Butyl Silsesquioxanes Si2nO3n(CMe3)2n (n=1-6)
Authors: Zhang Cheng Gen , Yu Shu Yuan , Zhang Hai Mei
Published: June 2012

Density functional theory (DFT) calculations were performed to investigate the structures of tert-butyl silsesquioxanes Si2nO3n(CMe3)2n (n=1-6). Our study focuses on the structures, stabilities, and electronic properties of the tert-butyl silsesquioxanes. The large HOMO–LUMO gaps, which range from 5.68 to 6.99 eV, imply optimal electronic structures for these molecules.
4.9tex × 2 Cotton / Pearl 65/35 High Count Blended Yarn Spinning Process Design
Authors: Li Jie , Wang Yuecun
Published: June 2012

Pearl fiber is evenly mixed with ultra-fine pearl particles spinning solution of cellulose fibers, made of a blend of functional spinning of regenerated cellulose fiber. This new fiber material not only preserves the beauty of pearls skin function, but also cellulose fiber material with moisture breathable, soft and comfortable, and other features. In this paper, on the basis of understanding of pearls on the fiber properties, being blended with cotton, for pearl yarn fiber blends high technology design. According to the design of spinning yarn spinning process of high principle requires, selecting process, determining the opening and cleaning, carding, combing, drawing, roving, spinning the reasonable parameters of procedures. At the same time, the problems in the spinning process and technical measures to be described. Include optimizing the process configuration, temperature and humidity control, choose the appropriate spinning equipment. For the development of high functional pearl textiles, clothing to meet consumer comfort, functionality needs make a help.
The Antistatic Research of Polyester/Nylon Fabrics Finished by Triblock Copolymer Containing Organic Silicon
Authors: Wang Tao , Xu Xian Lin , Sui Xiao Yang , Wang Li Na
Published: June 2012

Polyester/nylon blend fabric has some advantages, such as high strength, excellent drapability, but the biggest drawback of the blend fabric is the easily formed electrostatic. In this paper, the blend fabric was finished with the triblock copolymer containing organic silicon to improve the antistatic property of the fabric. The influence of the concentration of the finishing agent on the antistatic property was studied emphasisly. And the effect of antistatic, the feeling and the color fastness were analyzed. The results show that the finishing agent of triblock copolymer containing hydrophilic organosilicon with the concentration of 15 g/L can make the fabric achieve the best antistatic effect, the best feeling and the fabric color fastness is less affected.
Effect of Laundering Temperature on the Color of Brown Naturally Colored Cotton
Authors: Zhou Xu Ling , Shi Zhi Qing , Tang Zhi Rong , Zhou Wen Long
Published: June 2012

The color performance properties of brown naturally color cotton fabric was investigated in the elevated temperature home laundering, usually the Europe style laundering. The first laundering cycle would give naturally color cotton(NCC) fabric the most of color changes. The laundering did render NCC fabric darkening effect, and significant and proceeding color changes. The higher laundering temperature resulted in more color changes of the fabric. At least 0.5 class gray scale rating was increased for about per 30°C laundering temperature increase. The data reported here indicated that lower temperture home laundering benefit the color retentation and the care of the NCC fabric.
Preparation and Characterization of Ternary Composite Composed by Chitosan, Porphyrin Derivative and Single-Walled Carbon Nanotubes (SWCNTs)
Authors: Huang Cheng Hong , Hou Chang Jun , Li Juan , Qi Hui , Chen Sheng Fang , Fa Huan Bao , Huo Dan Qun
Published: June 2012

The functionalization of single-walled carbon nanotubes (SWCNTs) by noncovalent approach turned to be an effect strategy. Porphyrin and its derivatives are ideal materials for the decoration of SWCNTs. In this work, 5-(4-carboxypheny1)-10,15,20-triphenylporphyrin (H2CPTPP) was synthesized and covalently combined to the chitosan. The prepared chitosan/H2CPTPP composite was further conjugated with the oxidized SWCNTs to form chitosan/H2CPTPP/SWCNTs ternary composite. The results indicated that the carboxyl group of H2CPTPP was successfully introduced into the chitosan, which was confirmed by Fourier Transform infrared (FT/IR) spectroscopy, Raman shift and X-ray photoelectron spectroscopy (XPS). The solution of chitosan/ H2CPTPP/SWCNTs composite displays fluorescence quenching effect compared with that of chitosan/H2CPTPP composite at 615 nm and 654 nm upon excitation at 425nm.
Fuel Cell Electric Vehicle Energy Management Strategy Simulation Study
Authors: Zhang Ji , Wang Shen Bao
Published: June 2012

The advantages and disadvantages for several hybrid energy management strategies were analyzed in this paper. Power follower strategy served as the control strategy for some fuel cell electric vehicle. The control strategy was modeled and simulated in Advisor. The results indicate that the control strategy can manage the multiple energy sources well.
The Investigation of Dyeing Properties of Anion Modified Linen Fibers
Authors: Gao Shu Zhen , Liu Qun
Published: June 2012

Linen fibers oxidated by sodium periodate were anion-modified with sodium bisulfite, and treated linen fibers were dyed with cationic dyes. The thermodynamics principle of dyeing on modified linen fibers has been investigated by means of drawing adsorption isotherms,calculating dyeing saturation value and measuring dyeing levelness. The results indicate that adsorption isotherm of dyeing modified linen fibers with cationic dyes belongs to Langmuir adsorption isotherm,and the levelness of modified linen fabrics was better, the results indicate that the function of modification agent on linen fibers were more comprehensive and balanced.
Influence of Heat Insulation Material on Thermal Stress of Long Nozzle
Authors: Liu Hui Min
Published: June 2012

To prevent a long nozzle (LN) of non-preheating from rupture caused by thermal shock, heat insulation material (HIM) with a lower coefficient of thermal conductivity (CTC) was compounded in the inner hole (inner layer) or around the outer wall (outer layer), and the thermal stress was investigated. The two-dimension axially symmetric model of LN was proposed by simplifying the structure and boundary conditions. The influences of the HIM to the thermal stress of LN were analyzed by finite element method. The results show that the thermal stress suffered by LN can be drastically reduced by the inner layer, making the slow variation, but when its thickness increases from 2 mm to 3 mm, it almost has no influence on the thermal stress. The maximum thermal stress at the neck of LN reduces with the depression of the CTC at the inner layer thickness of 2 mm. The maximum thermal stress of LN can’t be reduced by outer layer, but the lasting time of higher stress can be shortened, and the thermal stress at the later period of steel-irrigating can be lowed. When the outer layer thickness is more than 2 mm, the increase of it has little influence on the thermal stress of LN, and the change of its CTC has little influence on the thermal stress either. The LN with tri-layer has lower thermal stress during all the period of steel-irrigating.
The Preparation and Properties of MgO-CaO-ZrO2 System Composite Materials
Authors: Wang Rong Lin , Wang Yan Ping , Cui Yi , Yu Li Xue
Published: June 2012

MgO-CaO-ZrO2 composite materials were prepared in oxidizing atmosphere at 1550 oC with sintered magnesia, calcium oxide and partial stabilized zirconia as raw materials. Sintering performance of the composites was measured by the checking of the bending strength, the apparent porosity, the thermal expansivity and the thermal shock resistance of samples, respectively. The phase compositions and microstructures of the composites were investigated by XRD, SEM and EDS. The results showed that CaZrO3 phase was formed by high temperture reaction between ZrO2 and CaO, and phase compositions of the composites consisted of two phases of CaZrO3 and MgO. The sintering performance of composites were promoted further with increasing the content of ZrO2 due to the volume expansion caused by the reaction of the added ZrO2 and CaO to form CaZrO3 phase in the refractories.
Synthesis and Luminescence Characteristics of Mg (II) Complexes with 5-Bromosalicyladehyde-Nicotinoylhydrazone
Authors: Tai Xi Shi
Published: June 2012

The ligand, 5-Bromosalicyladehyde-nicotinoylhydrazone, and its complex of Mg (II) were synthesized. The formation of complexes was confirmed by elemental analyses, UV and infrared spectra. The luminescence properties of ligand and its Mg (II) complex were investigated in solid, respectively. The results show that the ligand exhibit green luminescence at 524 nm and the Mg (II) complex exhibit blue luminescence at 462 nm.
Different Natural Season Weathering of B.mori Silk Fabric
Authors: Ming Jin Fa , Jiang Yao Xing , Zuo Bao Qi
Published: June 2012

Ultraviolet aging of B.mori silk fabric was researched under different natural season weathering conditions. Exposed samples were removed periodically and characterized by several analytical techniques. During different natural season weathering, the results showed that the yellowness index of B.mori silk fabric surface appeared obviously rising in natural weathering especially in summer season, reaching 28.78% higher than 25.78% of yellowness index under spring season weathering; The peak intensity of amide I and amide II significantly declined, even disappeared; And the same time, the thermal behavior of B.mori silk changed similarly under different natural season weathering; In addition, breaking strength of B.mori silk fabric decreased approximately 86.27%, 95.11% under spring and summer season weathering, respectively. So, it was obviously shown that during the summer season weathering, the natural aging rate of B.mori silk was more quickly than spring season weathering, which was helpful to understand the aging behavior and measure the correlation aging effect between spring and summer season weathering condition.
Study on Crystallization Kinetics of Li2O-Al2O3-TiO2-P2O5 Glass by Non-Isothermal Technique
Authors: Wang Yan Hang , He Kun , Zu Cheng Kui , Chen Jiang
Published: June 2012

The crystallization kinetics of Li2O-Al2O3-TiO2-P2O5 (LATP) glass was studied by differential scanning calorimeter (DSC) and X-ray diffraction (XRD) techniques. The results showed that DSC curves of LATP glass have a single glass transition temperature followed by one crystallization peak for β = 5 K/min and two crystallization temperatures Tp1 and Tp2 for β ≥ 10 K/min. The activation energies of crystallization obtained from Kissinger model of the first exothermal peak and the second exothermal peak of LATP glass are 251 kJ/mol and 310 kJ/mol, respectively. The Avrami exponents of the both crystallization peaks are approximately 3, indicating that the three-dimensional crystalline growth during its amorphous to crystalline transformation. LiTi2(PO4)3 and unknown crystalline phases firstly form when the mother glass was annealed at 973 K. With increasing of annealing temperature, AlPO4 phase appears.
Study on Coal Roadway Supporting Parameters of Broken Thick Top-Coal Large Section
Authors: Guan Wen Hua , Lv Kun , Peng Bo , Ma Wang
Published: June 2012

In order to solve the supporting problem of Wujiagou ore broken thick top-coal large sections coal roadway, in view of the mining geology and technology conditions, select the typical coal roadway 5106 tank and detect roof structure, detection results show that the major roof is coal, local contains feeble mudstone interlayer, shallow crack development, deep crack gradually reduce , then put forward the extra long bolt anchoring break top-coal to deep less fracture zone, and the theoretical calculation shows the feasibility and basic support parameters of using extra long bolt controlling deformation of coal roadway; Using FLAC numerical simulation method for different support scheme makes a comparative study, show that the extra long bolting effects obvious, and determined choosing extra long bolt + metal nets + W steel belt scheme. The site industrial test show that the extra long bolt + metal nets + W steel belt scheme supporting thick top-coal large sections of coal roadway effect is good.
Simulation on NOx Generation of RSP Calciner for Cement Production
Authors: Ya Mao , Chen Zuo Bing
Published: June 2012

At present, cement industry will be the third major pollution source of nitrogen oxide pollution following electric power and automobile industry. According to Chinese 12th Five-Year Plan, nitrogen oxide emission must be decreased 10%. In this paper, the resources of NOx emission from cement production were analyzed. On the basis of forming mechanism of thermal NOx and fuel NOx, a simulation model was constructed to predict NOx generation process in RSP calciner. For the turbulent flow in calciner, a probability density function (PDF) describing time variation is used in model to predict NOx generation rate. The results provide important theory evidence for low-NOx calciner design and selection of its operation process parameter.
Research on Perfomance of Vulcanized Eucommia Ulmoides Gum Blending with Asphalt
Authors: Li Zhi Gang , Zhao Yue
Published: June 2012

Asphalt modifier is traditionally obtained from petroleum byproduct, which has a high price and can not regenerate. This makes the traditional asphalt modifier not able to satisfy the economic requirement of increasing highway construction. Therefore, it is necessary to find a new modifier, which is economically efficient and also has good engineering performance. This paper introduces a recent development on the vulcanizing process of eucommia ulmoides gum（EUG） and the physical mechanics function of vulcanized gum, and explains its desirable engineering characteristic as well as its engineering application foreground. In this study, based on the characteristic of rubber-plastic unified material chart, vulcanized EUG is blended with asphalt binder as a modifier. The analysis of infrared spectrum and scan electricity mirror and asphalt basic index experiment are made. The result indicates that vulcanized EUG can improve both low temperature performance and high temperature performance of asphalt, which means that it is a feasible and desired choice for asphalt modifying.
Experimental Research on Strengthen Mechanism of NaOH on Light Wall Materials Prepared from Crushed Brick Powder
Authors: Wang Xue , Guo Yuan Chen
Published: June 2012

Crushed brick light weight wall material, which was made of crushed brick as a main raw material and P•S cement as a cementious material. Crushed foam glass and some admixtures were added, is prepared under the ordinary temperature and pressure condition. The main research in this paper is if NaOH has good alkaline excitation on crushed brick light weight wall material through experimental research and mechanism analysis. Studies have shown that: (1) The main chemical composition of crushed brick powder are SiO2 and Al2O3, crushed brick powder have a certain activity.(2) NaOH releases the activity of the internal soluble SiO2 and Al2O3.(3) In this experiment system, when the caustic soda content is about 3%, there has been an obvious peak of compressive strength.
The Study on the Application of Material Media in the Modern Decorative Art
Authors: Li Jian Wen
Published: June 2012

This paper interprets the function and effect of material media in decorative art. It explores the extension and development of material media in decorative art, from the historical viewpoint. It advances that modern decorative art must be investigated from the new perspective, that is, the view of integrated material is used to explore and study modern decorative art. This is based on the fact that art tends to be generally integrated. Under such circumstances, its artistic expression and avant-garde ideas tend to have a direct correlation with material media, analyzing from its artistic value and aesthetic experience. More importantly, its artistic essence is supposed to be interpreted from its abstractness and self-expression of space.
Properties Research on Chiral Liquid Crystalline Polysiloxanes Containing Chiral and Electron Withdrawing Group
Authors: He Xiao Zhi , Han Li , Zhai Yi , Tian Mei , Yao Dan Shu
Published: June 2012

A series of new chiral side-chain liquid crystalline polysiloxanes(P0-P7) bearing cyano groups were synthesized with a cholesteric LC monomer and a nematic monomer with cyano units(electron withdrawing). The chemical structures and LC properties of the polymers were measured by spectrum and thermal analysis techniques. The obtained polymers were soluble in many solvents and the specific rotations showed negative values and increased with the increasing content of chiral reagent. P1 showed grained texture of smectic A, P2~P7 showed lined texture of chiral smectic C(SC*). XRD curves of P1~P7 samples showed sharp and strong peaks at low angle, but no sharp peak was seen for P0 sample. The temperatures at which 5% weight loss occurred(Td) were greater than 300oC for all the polymers, which reveals all the polymers were stable. And the Tg values of polymers were all low. The Tg and Ti values are all increased with the increasing chiral contents. All the polymers displayed wide range of liquid crystal phase on heating and cooling cycle.
Study on Full-Slag Concrete Feasibility
Authors: Chen Tie Jun
Published: June 2012

In this paper, of the slag composition, stability and slag particles indicators of concrete performance, demonstrated use of steel slag to do the Complete Works of material, steel slag powder admixture with high wear resistance, water resistance slag cement preparationthe feasibility of high-performance cement concrete.
Flexural Behavior of near Surface Mounted CFRP Bars Strengthened Reinforced Concrete Beams
Authors: Ahmad Shuaib H. , Najm Abdullah Bin , Naani Antonio
Published: June 2012

In recent decades, use of fibre reinforced polymers (FRP) materials has become very popular for strengthening / re-strengthening of reinforced concrete (RC) structures. This includes flexural and shear strengthening of RC structural members such as slabs, beams and columns.In this study, a computerized analytical model is presented to predict the load-deflection response of flexure critical RC beams externally strengthened with near surface mounted (NSM) CFRP laminates. The analyical model utilizes constitutive material properties of concrete, reinforcing steel, CFRP laminate materials, strain compatibility, sectional analysis to develop moment-curvature relationships, which then are used to generate the load-rotations and load-deflection of the flexure critical RC Beams strengthend with NSM CFRP laminates. For validation of the analytical model, the predictions of the analytical model are compared with the experimental results of flexure critical RC beams strengthened with NSM CFRP laminates and the comparisons are judged to be good.As a part of the experimental investigation of this study, a series of 18 full scale beams Reinforced Concrete Beams strengthened with carbon fiber reinforced polymer (CFRP) laminates will be tested in flexure and shear. The results of flexural tests will be analyzed and compared with the predictions of the analytical model.
Effect of Gradation and Cement on the Properties of Soil-Cement Mixtures
Authors: Hsu Sung Chi , Chiang Huan Yang , Lin Ji Yuan
Published: June 2012

Eight non-plastic soils with different gradation are used for this research to study the appropriate choice of soil-cement mixture for a earth and rock-fill dam construction project. The properties of soil-cement materials are influenced by several factors, including type and proportion of soil, cementitious materials, water content, compaction, uniformity of mixing, curing conditions, and age of the compacted mixture. Based on the experimental results, the maximum dry density will increase with an increase in cement content for soils with low fines content. However, no significant variation was noticed for soils with higher fines content. For given cement content, the maximum density of soil-cement mixture also has a positive correlation with the average grain size, D50, and uniformity coefficient of gradation, Cu. Based on USBR criteria and experimental results, a minimum of 11% of cement content are suitable for soil-cement application on the dam construction. Coarser grain soils are more applicable than finer grain soils to soil-cement construction.
Investigation of Road Performance and Colloidal Structure of Tourmaline Modified Asphalt
Authors: Zhao Yong Zhen , Wang Peng , Wang Chao Hui , Li Yan Wei
Published: June 2012

Tourmaline modified asphalt (TMA) was prepared by melt-blending process. The modified effect of tourmaline on base asphalt was studied systematically by penetration test, softening point test, ductility test and bending beam rheometer (BBR) test. Based on this, the chemical components of the samples were tested and the colloidal structures of the asphalt were analyzed. Experimental results showed that the temperature susceptibility of asphalt could be improved significantly with the addition of tourmaline. Softening point test revealed that the softening point of TMA was constantly increased with the increasing amount of tourmaline. BBR test indicated that the low temperature properties of asphalt were improved with the addition of tourmaline. The colloidal structure of the asphalt was not changed due to the addition of tourmaline, remaining Sol-Gel type, and a stronger stability happened with the increasing mixing amount of tourmaline.
Dry Shrinkage and Compressive Strength of Blended Cement Pastes with Fly Ash and Silica Fume
Authors: Li Yan , Sun Dao Sheng , Wu Xiu Sheng , Wang Ai Guo , Xu Wei , Deng Min
Published: June 2012

This paper reports the drying shrinkage and compressive strength results of cement pastes with fly ash and silica fume. In this study, Portland cement (PC) was used as the basic cementitious material. Fly ash (FA) and silica fume (SF) were used as cement replacement materials at levels of 0%, 5%, 10%, and 15% , 40%, 35%, 25%, and 15% by weight of the total cementitious material, respectively. The water/cement (PC + FA + SF) ratios (w/c) was 0.28 by weight. The samples produced from fresh pastes were demoulded after a day; then they were cured at 20 ±1°C with 50 ± 3% relative humidity (RH) until the samples were used for drying shrinkage and compressive strength measurement at various ages. The results show that drying shrinkage and compressive strength increase with increasing SF content, and the optimum composition of blended cement pastes is the cement paste with 30% fly ash and 10% silica fume, which possesses lower drying shrinkage values than that of plain cement paste and higher early age strength than that of blended cement pastes with fly ash. Furthermore, a linear relationship is established between compressive strength and drying shrinkage. By comparing the development of compressive strength and the drying shrinkage deformations, it appears possible to predict the drying shrinkage according to the acquired compressive strength.
The Energy Absorption of Carbon Fiber Reinforced Polymer under Different Impact Speed
Authors: Quan Guo Zheng , Tong Ying , Li Gui Sheng
Published: June 2012

In order to investigate the energy absorption of carbon fiber reinforced polymer (CFRP) under different impact velocity, ABAQUS finite element analysis software was used to simulate the impact experiments under the velocities of 1～100m/s. The kinetic energy reduction of the bullet was analyzed. The results shows that: the energy absorption of the composites panel improves with the initial impact velocity increasing, while as the velocity increasing to a certain value, such energy absorption approaches a constant value. And taking further analysis found that property of impact resistance of CFRP has a speed effect, with the strain rate increasing, the dynamic mechanical properties improve.
The Application of the Deep Carbonized Woods to Building Skins
Authors: Zhu Jin , Chen Yi Fan
Published: June 2012

This paper has analyzed the existent patterns of the deep carbonized woods to building skins from the level of the relative independence and the integration for skins and structures. Combining with the physical and chemical properties of the deep carbonized woods, the paper discusses how it expresses the aesthetic significance as the building skins. Meanwhile this paper summarizes as a kind of new woods, the ecological significance of the deep carbonized woods to future development, which including four aspects for avoiding the urban heat-island effect, extending environment life cycle, contributing to the process and assemble of standardized components as well as earthquake resistance and disaster mitigation.
Experiment Study of Influence Factors on High-Temperature Stability of Closely Gap-Graded Bituminous Mixture
Authors: Guo Rui , Feng Zhong Ju , Li Ping
Published: June 2012

Rutting in asphalt pavements continues to create problems for pavement. The aim of this study was to analyze the influence of different gradation composition, asphalt dosage, temperature and dosage of anti-rutting agent on high-temperature stability of cosely gap-graded bituminous mixture. To achieve this objective, 171 different rutting specimens using different mix parameters were analyzed for their the high-temperature stability. The mix parameters include: three types of aggregate gradation, five types of asphalt dosage, four types of temperature and five types of anti-rutting agent dosage. Study results indicate that adding proper content of coarse aggregate can play occluding and wedging role in aggregate mixture. The optimal bituminous dosage in rutting test are lower 0.1%~0.3% than that in Marshell test. At 65°C, the high-temperature stability of the cosely gap-graded bituminous mixture is not able to meet the requirement of standards. The optimal dosage of anti-rutting agent are equal to 0.3% in case of no increasing bituminous dosage.
Preliminary Study about the Sediment Carrying Capacity Formula
Authors: Zhang Wei Yi , Wang Zhen Xiang , Zheng Jun
Published: June 2012

Combined with the equilibrium condition, the formula of vertical average sediment concentration has been derived from the vertical two-dimensional suspended sediment diffusion equation. Based on analyzing and comparing two hydrodynamic formulas, a new formula of sediment carrying capacity has been deduced. Some river and inshore sediment data has been collected to validate the formula and find that the new formula has higher accuracy and applicability comparing with the two hydrodynamic formulas, it shows that the new formula has a high application value.
Three-Dimensional Sediment Numerical Simulation of Wenzhou Oufei Tidal Flat Sea Area
Authors: Li Jia Rui , Mo Lei , Zhang Wen Hu
Published: June 2012

A flow and sediment mathematical model was built under three-dimensional hybrid coordinate to simulate Wenzhou Oufei tidal flat and its neighboring sea area, and the verification was down. The calculation results and the observed data are identical well. In estuary area, the sediment concentration is the highest, then outside the estuary. In Oufei tidal flat area, the sediment concentration is relatively high, and it decreases gradually towards the open sea. Through the simulation, the characteristics and the basic law of sediment concentration distribution was reproduced.
Synthesis of Carbon Nanofiber-Titania-Cordierite Monolith Composite and its Application as Catalyst Support on Citral Hydrogenation
Authors: Zhu Jie , Li Ming Shi , Lu Mo Hong
Published: June 2012

We reported the synthesis of a promising carbon nanofiber-titania-cordierite monolith composite (C/TiO2/monolith) and its application in citral hydrogenation. The composite was synthesized through two steps: TiO2 coating on the surface of the monolith with sol-gel method and the following carbon deposit by methane decomposition. C/TiO2/monolith was subsequently employed to prepare its supported palladium catalyst, Pd/C/TiO2/monolith and its catalytic performance was evaluated in selective hydrogenation of citral. Results revealed that 2.0 wt% tetrabutyl titanate sol in composite synthesis was the best in improving textural properties of C/TiO2/monolith. The optimal composite possessed a BET surface area of 39.4 m2/g and micropore area accounted for only 3.8% of its total BET surface area. It contained about 30 wt% of carbon, which was mainly composed of carbon nanofiber. Pd/C/TiO2/monolith exhibited the high citronellal selectivity (81%) at 90% citral conversion, which was attributed to the decrease of internal diffusion limitation due to its mesoporous structure.
Experimental Research on Dynamics Characteristics and Damage of ALC Wallboard
Authors: Yang Yan Min , Zhang Hao
Published: June 2012

The new building wall material ALC ( Autoclaved Lightweight Concrete) wallboard is solid composite sandwich panel. The existing standard requires that the ALC wallboard must meet resistance performance when it is laid into the wall. The evaluation index is determined and exists error. In order to guarantee the ALC board has better suitability，and make up the deficiency of the current specification. Through the impact resistance performance test of the ALC wallboard， study the dynamics characteristics under impact loading. Do some further analysis of the ALC wallboard dynamic characteristics damage problems through the change of frequency and the damping ratio. In turn， these changes can be the basis of structural damage evaluation. Laying a foundation for the ALC wallboard can better applied in practical projects.
Influence of Air Content on the Compressive Strength of Concrete
Authors: Bai Rui Ying , Cai Ji Wei , Wu Ji Xu , Wei Gong Lei
Published: June 2012

The influence of air content on compressive strength of C20，C30，C40 and C50 concrete was investigated in this paper. The result shows that this relationship varied with concrete strength grade. For C20~C40 concrete, the air content increases with addition of air entraining agent, while a maximum air content value appears for C50 concrete. The compressive strength of C20 decrease slightly with the air content, on the other hand, that of C40 significantly decreases relatively.
Analysis and Evaluation for Longxihe Dangerous Rock Stability
Authors: Nie Lei , Qiao Dao Yong , Su Zhan Dong , Zhang Han , Lv Yan
Published: June 2012

Longxihe dangerous rock is located on both sides of gully of Longxi river in Chongqing. The complex geological environmental condition made dangerous rock a typical geological hazard to Chongqing. Through field investigation of dangerous rock zone and analysis of geological environment condition, we researched the formation mechanism and unstable mode of dangerous rock and done qualitative analysis and analytical analysis to the dangerous rock. Under the condition of dead weight and surface load , the stability coefficient is 1.16~1.29, which illustrates that dangerous rock is basically stable; under the condition of dead weight, surface load and hydrostatic pressure, stability coefficient is 0.95~1.04, which illustrates that dangerous rock is not stable. The emergency capacity is so slow that it’s urgent to take treatment measures to control dangerous rock. And the control measures of clearing dangerous rocks, bolting, concrete spray protection and local hanging net to support should be adopted immediately.
A Method Based on Neural Network for Risk Prediction of the Typical Moraine-Dammed Lake Outburst in the Himalayan Region
Authors: Xu Weng Ming , Wang Gang Cheng , Liu Chong
Published: June 2012

In this research, based on neural network, thirty typical moraine-dammed lakes were selected as the training set. In accordance with the rules defined, ten evaluation indexes were made dimensionless and used to train the model. Then the research could get the applicable model that evaluated the probabilities of moraine-dammed lake outburst in the Himalayas region of Tibet, China. Then the probability of outburst was predicted for the Laqu Lake based on the developed model, and the predictive value was 0.538. In terms of risk level standards divided, the Laqu Lake was high-risk, which is consistent with the field survey. It well demonstrated the applicability that using the neural network to assess the probabilities of moraine-dammed lake outburst.
Effect of High-Energy Ball Milling to Powders on Microstructure and Physical Properties of Al-50Si Alloy
Authors: Zhang Li Jun , Xie Jing Pei , Wang Ai Qin
Published: June 2012

Al-50Si can be fabricated with a method in which air-atomization is followed by vacuum canning hot-pressing process. In order to improve the mechanical character and the physical property，the treatment of high-energy milling are used in the pretreatment of the powder of Al-50Si.The microstructure，density ,coefficient of thermal expansion are analyzed by scanning electron microscope(SEM) and thermal physical tester. It was found that the silicon grain was refined, the density and strength was improved when high silicon alloy powders were treated by high-energy ball milling.
Laboratory Fast Corrosion Test of Plain Steel Bars in Concrete Beams
Authors: Zhao Shun Bo , Hou Peng Bing , Qu Fu Lai
Published: June 2012

An experimental study was carried out to examine the non-uniform corrosion of plain steel bars in reinforced concrete beams partially placed in 5% sodium chloride solution under conditions of accelerated corrosion. 4 reinforced concrete beams with different concrete strength were made. The crack distributions of the beams due to pre-loads and expansion of corrosion product, and the sectional corrosion characteristics of plain steel bars are described in detail. The sectional area loss relating to mass loss and change along pure bending length of the beams are discussed. These can be used as the basis of test for further studies to build the numerical models of serviceability of corroded reinforced concrete beams.
A Homogenisation Procedure for the Steady State Periodic Forced Response of Laminated Composite Beams at Large Vibration Amplitudes
Authors: Merrimi El Bekkaye , El Bikri Khalid , Benamar Rhali
Published: June 2012

The purpose of the present paper is to show that the problem of geometrically non linear steady state periodic forced response of symmetrically and asymmetrically laminated composite beams with immovable ends can be reduced to that of isotropic homogeneous beams with effective bending stiffness and axial stiffness parameters. This simple formulation is developed using the governing axial equilibrium equation of the beam in which the axial inertia and damping are ignored. The theoretical model is based on Hamilton’s principle and spectral analysis, to determine the effect of the excitation frequency and level of the applied harmonic force on its dynamic response at large vibration amplitudes, which are found to be in a good agreement with the published results.
Performance and Mechanism Study on C50 Micro-Expansion Polypropylene Fiber Reinforced Anti-Cracking Pumping Concrete
Authors: He Gao
Published: June 2012

Based on the construction application of C50 anti-cracking pumping concrete, the influence of the polypropylene fiber and expansive agent on the concrete was studied. The workability, mechanical property, drying shrinkage and crack resistance of the pumping concrete and their mechanisms were tested. The results indicated that the workability achieve the standard of pumping concrete through increasing the dosage of polycarboxylic superplasticizers. The incorporation of polypropylene fiber and expansive agents has little influence on the compressive strength and elastic modulus, but will significantly enhance split tensile strength and decrease the drying shrinkage and cracking.
The Discussion of Iron Wire Fire Hazard
Authors: Wang Lian Tie , Xia Da Wei , Gao Ao , Meng Qing Shan
Published: June 2012

The safe current carrying capacity of iron wire is far less than copper wires. In the simulation experiments, use iron wire replace copper wire and use welding machine as electric equipment, even the flaming. Normal operating electric homework, the whole iron wire overheat and cause carbonization of insulation layer and even set on fire because of line’s overload, and lead to short circuit between wire. Extract fire material evidence, observe and analysis. Summed up the microstructure characteristics of the sample. Apparent characteristics of short circuit melting mark organization is:wire matrix is widmanstatten structure and ferrite, the transition region is mainly widmanstatten structure; overload melted mark organization is mainly cast structure, there was more casting .
Research on Accelerated Corrosion of Steel Bar in Reinforced Concrete Components
Authors: Yang Mei , Leng Ling Ye , Zhang Peng Fei
Published: June 2012

The most effective method to quickly produce large quantities of corroded reinforced concrete component is electrochemical corrosion. In this study, what effects corrosion rate as well as the process of accelerated corrosion was experimentally investigated.
Securing Superior Properties of Composite (PP+WF) through Central Composite Design
Authors: Karim A.N. Mustafizul , Khalid Nor A. B. , Ismail Raja N. H. R. , Haque Mahbubul , Begum Shahida
Published: June 2012

Due to numerous attractive properties, use of composites is in increasing trend. Efforts are being made to develop new composites securing their useful properties at optimum level for more demanding applications. The purpose of this project is to optimize the mechanical properties of composite (polypropylene + wood fiber) using Central Composite Design (CCD) technique. Accordingly experiments were conducted to develop mathematical models in terms of three process parameters - composition (percentage of PP and wood fiber), injection pressure (bar), and time (second) for functional characteristics such as tensile strength and water absorption. Design expert software was used for convenience to carry out the analysis with a view to identifying the optimum level of the processing parameters for securing the desirable properties of the composite.
Using New-Type Composite Silicate Heat-Insulation Material to Improve Residential Energy Efficiency in Regions of Cold Winter and Hot Summer
Authors: Yan Shao , Zeng Ling , Zuo Hui , Li Jia Hua
Published: June 2012

This article introduces the method of the building enclosure construction of energy saving residential buildings based on the FHP-Vc inorganic composite silicate heat-insulating board and its practical effect in projects.
Mechanical Properties of Rocks Used for the Construction of Vehicular Bridges Supported by Pier Masonry
Authors: Mendoza-Chavez Gustavo , Martínez-Mártinez Luis Horacio , Delgado-Hernandez David Joaquin , De León Escobedo David , Guzmán Elia Mercedes Alonso , Molina Wilfrido Martínez , Arreygue-Rocha Eleazar , Chávez-García Hugo Luis , Arteaga-Arcos Juan Carlos
Published: June 2012

In Mexico, since the early stages of the civilization, the stone masonry has assumed an important role in construction due to the wide availability of this kind of material. Masonry is a material composed by bricks, carved or even rubble stones jointed without (dry joint) or with mortar (mortar joints); which is principally formed with sand, water and cementitiuos materials. The research presented in this paper deals with the procedure of obtaining the mechanical properties of rocks placed on piers of four vehicular bridges located in the south of the state of Mexico, these mechanical properties are compressive strength, modulus of elasticity, Poisson ratio, Cohesion and Internal friction Angle of the rocks as independent units, also are reported the Density values. All of these properties are necessary to conduct further research regarding the mechanical behavior of the pier as a structure since this piece of research is part of an ongoing project concerning risk assessment of vehicular bridges developed in Mexico. The identified rocks in masonry were volcanic igneous materials such as dacites, basalts, rhyolites, andesites and rusted andesites. The materials with the highest and the lowest mechanical properties are the basalt and the dacite respectively. It is recommended to use the dacite’s properties in order to perform a conservative analysis of the mechanical behavior of any masonry structure, located near the selected sample studied herein.
The Study of Using Fly Ash to Produce Ultra High Performance Fibre Reinforced Concrete
Authors: Corinaldesi Valeria
Published: June 2012

Ultra High Performance Fibre Reinforced Concrete (UHPFRC) is a cement-based material, which behaves like a low-porosity ceramic material with excellent mechanical performance. This work was aimed to study soft cast (flowable at casting time) UHPFRCs and, in particular, UHPFRC mechanical performance was monitored by means of compression, bending and splitting tension tests. Two different kinds of mineral addition were compared: silica fume and fly ash. In the case of fly ash, several water to cement ratios were tested ranging from 0.20 to 0.25. Moreover, steel fibers and acrylic-based superplasticizer were employed to prepare the UHPFRC mixtures.
Observation about Architecture Skin Using New Material
Authors: Zhang Wei , Yu Jian Qiu
Published: June 2012

This article researches the newly emerged architectural skin materials such as ETFE membranous material, paper, fabric, plastic, mental tapping board and mental weaving net, printing glass and colored glass, and various special materials. It analyses their characters and impression effects in architecture.
Preparation and Research on Performance of Fluorine Rubber/Metal Composite Sealing Boards
Authors: Zhang Ai Ling , Feng Yin Feng , Li San Xi , Wang Song , Lv Zhen Qian
Published: June 2012

Cobalt-boron complex were prepared as a novel adhesion promoter. It was characterized by the infrared spectrum and the UV spectrum. The maximum absorption wavelength of cobalt-boron complex is in 285nm by the UV spectrum. And the fluorine rubber / metal composite sealing boards were prepared with cobalt-boron complex. The results show that the sample with cobalt-boron complex has better scratch resistance, higher impedance resistance than that without cobalt-boron complex; meanwhile the sample with cobalt-boron complex also has a better bonding situation. In the most optimal process conditions, the scratch resistance value of the composite sealing board is 3800g.
An Experimental Study on Ductility of Fiber-Strengthening Concrete
Authors: Cai Chuan Guo , Wei Zhong Xuan , Yang Xu Pu
Published: June 2012

Abstract: In view of the mass brittle failures of reinforced concrete construction in Whenchuan earthquake, the ductility of construction was selected to be the research object. A group of the cyclic-loading experiment was carried out on seven shear-and-pressure concrete columns which mixed with different fiber types and various volume content, but same cross-section and reinforcement. In the process, the load-displacement curves of the columns were attained and the skeleton curves accordingly were drawn, together with the key values in various stages. Based on these, an analysis on various factors which affect the ductility of the columns is conducted. The results show that the ductility of columns is improved significantly and the appearance of plastic hinge is delayed, which are likely to avoid the occurrence of brittle failure in earthquake. The experimental result indicates the steel fiber-strengthening concrete possesses the strongest energy dissipation capacity, the carbon fiber improve ductility of the column, and the synthetic fibers can effectively delay emergence of the plastic hinge, but a lesser extent to improve the shear capacity of the column.
On Performance & Application Prospect of Inorganic Materials Used for Exterior Walls Insulation in Hot Summer and Cold Winter Zone
Authors: Jun Lu
Published: June 2012

In response to the requirement of saving 65% energy in hot summer and cold winter zone, a comprehensive comparative analysis has been conducted in various aspects towards the common organic and inorganic thermal insulating materials in the market. And a conclusion has been drawn that, on the basis of reaching the standards, inorganic thermal insulating materials represented by aluminum sulfate boast obvious advantages compared to organic ones in terms of fire proofing, durability, economical efficiency, and environmental protection etc. Thus, the inorganic thermal insulating material will become the first choice in future market.
Experimental Study on Flexural Behaviors of All-Lightweight Aggregate Concrete Slabs
Authors: Yang Yan Min , Zhang Hao
Published: June 2012

In order to study the feasibility that whether the all-lightweight aggregate concrete slabs can be the structural member， we test on 6 pieces of all-lightweight aggregate concrete slabs. The flexural behaviors of all-lightweight aggregate concrete slabs which have the same intensity level and section size is analyzed comparatively under the same mode of action， but different reinforcement situation. The result shows that the all-lightweight aggregate concrete slab has certain bearing capacity and deformation capacity. It can replace the ordinary concrete slab as load-bearing member. The experimental study in the paper can provide a basis of the lightweight and energy-saving multi-story structure.
Effect of Anisotropy on Shear Wave Velocity in Wood
Authors: Zhou Jian Ping , Liu Jin Xia , Gao Wen Yang , Cui Zhi Wen , Lv Wei Guo , Wang Ke Xie
Published: June 2012

The velocities of shear waves propagating along radial direction of birch and elmwood specimens are measured in order to study the effect of anisotropy on shear wave velocity. The relationship between the shear wave velocity and the oscillation direction is examined by rotating an ultrasonic sensor. The results indicate that the effect of anisotropy on shear wave velocity in birch and elmwood specimens is similar to Japanese magnolia specimen. When the oscillation direction of the shear wave corresponds to the certain anisotropic direction of the wood specimen, the shear wave velocity decreases sharply and the relationship between shear wave velocity and rotation angle tends to become discontinuous. The intrinsic birefringence due to the anisotropy of birch and elmwood woods is observed. Their texture anisotropies are strong. In an isotropic nylon, on the contrary, the value of shear wave velocity was similar to a circular ring. This investigation is significant meanings in architectural and civil engineering field.