bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative Research of the Sizing Performance of the Compact Spun-Yarn and Ring Spun-Yarn
Authors: Ma Qin , Liu Xue Feng
Published: June 2012

The characteristics of the compact spun yarn were introduced, and the problems in the sizing process of compact spun yarns were analyzed. Because of the high size loading of the compact spun yarn, a large number of yarns break and the chubbiness of the fabric were affected. Aiming at the problems above, through sizing experiment and testing of the performance of the yarns, the differences between the compact spun yarn and the conventional ring spun yarn were analyzed. Comparing with the conventional ring spun yarn, the size loading rate of the compact spun yarn was reduced about 1 to 3.5 percentage points under the same equipment conditions and sizing techniques. To obtain the same strength and hairiness sticking effect, the size loading of the compact spun yarn can be 5 to 6 percentage points lower than that of the conventional ring spun yarn. Sizing materials can be saved, and the cost of the sizing process could reduced by 50%.
Tensile Property Test Analysis of Double Protein Modified Fiber
Authors: Zhu Jin Zhong , Wang Shi Hui , Hu Jun Rui , Li Yun
Published: June 2012

In order to study the tensile mechanical properties of the double protein modified fiber. Tensile breaking property and stress relaxation were analyzed and proper mechanical models were selected for fitting. The analysis shows that: in dry and wet, the straight tensile breaking tenacity of the double protein modified fiber is weaker than that of the modified soybean protein fiber, the elongation at break and initial modulus are near to those of the modified soybean protein fiber, the breaking tenacity of the double protein modified fiber increases slightly when wet while the elongation at break and initial modulus decline a little. In knotted and looped, the double protein modified fiber’s tensile breaking tenacity is weaker than that of the modified soybean protein and its tensile breaking strength and elongation at break decrease differently. The fitting reveals that the four element nonlinear viscoelastic model is the best to describe straight tensile. The two optimal models for knotted and looped tensile are the four element nonlinear viscoelastic model and the Improved Zurek model. In addition, the six element viscoelastic plasticity model is appropriate to simulate stress relaxation.
Synthesis of Novel Separation Materials Based on Molecular Imprinting Technology
Authors: Xiao Shu Juan , Yu Shou Wu , Li Hong Xia
Published: June 2012

Molecular imprinting technology is a kind of new-emerging polymerizing technology, which produces molecule recognition materials with high selectivity an affinity. MIPs were synthesized using acrylic amide as functional monomers, azodiisobutyronitrile as initiator, and lutelin as template molecules. The absorption capability of MIPs wans studied. The results showed that the imprinting efficiency is 97.9%.
Characterization of Indium-Doped CdZnTe Crystal Grown under Te-Rich Conditions
Authors: Wei Gao Li , Wang Lin Jun , Zhang Ji Jun , Yuan Zheng Wen , Qin Kai Feng , Min Jia Hua , Liang Xiao Yan , Xia Yi Ben
Published: June 2012

CdZnTe (CZT) crystals with a diameter of 52 mm was grown using low pressure Bridgman method and were indium-doped under Te-rich conditions. Results showed the Te concentration was almost the same in different part of the as-grown ingot. Through IR transmission, Te inclusion with regular triangular or circular shapes could be observed, and the size of Te inclusion was around 7 µm and the concentration was 1.5  105 cm-3 for the CZT in the middle part of the ingot. I-V characteristic showed a good linear behavior with a resistivity of ~1010 Ω•cm.
Preparation and Characterization of the Hydrophilic Copolyester
Authors: Wang Qiong , Wang Chao Sheng , Wang Hua Ping , Jiang Zhen Lin , Liu Jia Lin
Published: June 2012

A series of hydrophilic copolyesters were prepared via copolymerization method with purified terephthalic acid (PTA), ethylene glycol (EG), 5-sodium suflo bis-(hydroxyethyl) isophthalate (SIPE) as the third monomer, and different content of polyols (FMA01) as the fourth monomer. The chemical structures of the hydrophilic copolyester were described by Fourier transform infrared spectroscopy(FTIR), and the thermal properties of the samples were studied by thermogravimetric analysis(TGA) and differential scanning calorimetry(DSC). The hydrophilic properties of the samples were measured by contact angle(CA) measurements. Results showed that such modified copolymers had excellent hydrophilic properties. When SIPE reached 3mol% and FMA01 reached 0.8mol%, the copolyester film turned its wetting property to hydrophilic with water contact angle of 53.7°.
The Study on Nano-Silica Modified Phenolic Resin Used as the Magnesite-Carbon Brick Binder
Authors: Liao Qing Ling , Zeng Li Ming , Li Xuan Ke
Published: June 2012

The modified phenolic resin was synthesized by sol-gel process using in-situ formed nanosized silica. The improved phenolic resin was characterized by IR and TG-DTA analyses .The results show that the interaction between SiO2 nanoparticles and phenolic resin lead to the decrease of concentration of phenolic hydroxyl groups, and introduce the impurity atom Si to the phenolic resin molecule chain, which promotes the heat resistance and stability of phenolic resin. The physicochemical property analyses show that the magnesite-carbon brick using this modified phenolic resin as binder possesses a low apparent porosity and a high bulk density and compression strength.
Wound Dressing Utilising Nonwoven Wool Matrix
Authors: Islam Saniyat , Arnold Lyndon , Padhye Rajiv
Published: June 2012

Textile substrates can be treated with suitable polymer solutions to enhance the surface functionality. This paper highlights the application of chitosan (CHT) on 100% wool nonwoven matrix using traditional pad-dry-cure method; and its potential application in medical textiles, specifically wound dressing products. 100% wool nonwoven matrices were prepared by a needle punching process and applied with different concentrations of CHT. The blood uptake and antimicrobial efficacy was evaluated for the CHT-treated samples. It was shown that 0.3% CHT-treated samples demonstrated good absorbency and excellent antimicrobial properties.
The Effects of Oil Palm Fruit Bunch (OPFB) Fiber and Coupling Agent Loadings on the Performance of Hybrid Composites
Authors: Kalam Anizah , Berhan M.N. , Hanafi Ismail
Published: June 2012

Hybrid composites were prepared by incorporating oil palm fruit bunch (OPFB) fibre in the mixture of clay and polypropylene as secondary filler. OPFB and MAPP loadings were varied to investigate it effects on the performance. Tensile and impact tests were performed on the hybrid composites to evaluate their mechanical performances. Water absorption and thermal degradation tests were also conducted on the hybrid composites. Results indicated that the incorporation of OPFB in PP/PPnanoclay has decreased the thermal stability of hybrid composites. Tensile modulus of hybrid composites increased as the OPFB loading increases and further increased with the increasing of MAPP loading. Generally the tensile strength has decreased with the addition of OPFB, however slight increased was observed when the MAPP loading was increased. The impact strength has also increased with the increasing of OPFB for higher MAPP loading.
Elastic Modulus of Rhombus Dodecahedron Closed-Cell Cellular Materials
Authors: Zhang Li Gang , Zhu Hong , Qi Xiang Dong , Wang Jian
Published: June 2012

Based on the pore formation principle, geometrical model to describe cellular materials was constructed. The model is closed-cell rhombus dodecahedron with thick edges. The dependence of relative density on microstructure parameters and the unitary relation have been obtained. By finite elements method, the relative elastic modulus was simulated, the influence of microstructure and relative density on elastic modulus was analyzed. The results show that the wall-face connective curvature radius is the primary affecting factor of relative density increment and the wall-thickness is less significant; the solid materials added at the intersecting part of the wall-faces produce same effect on elastic modulus. The conclusion can be applied in optimization design of cellular materials.
Research on Open-Cell Rigid Polyurethane Foam as Vacuum Insulated Panel Core
Authors: Kan An Kang , Han Hou De
Published: June 2012

Open-cell rigid polyurethane foam was taken as core material of the vacuum insulated panel, and the effects of open-cell ratio, density, cell-diameter and intensity on adiabatic performance of the vacuum insulated panel were simply discussed. The effect of vacuum degree on it is also discussed. The pre-treated craft of vacuum insulated panel manufacture is introduced too. If the open-cell rigid polyurethane foam was taken as the core-material and pretreated craft was carried, the vacuum insulated panel’s thermal conductivity can be less than 10mW/(m•K).
Influence of Fractal Structure on Light Absorption of down Fiber Assembly
Authors: Yang Shu
Published: June 2012

Ultraviolet and visible light absorption property of fiber assembly is considered to be determined by the material structure. In this paper, X-ray computed tomography was implemented to characterize the internal porous structures of down fiber assemblies. And then fractal methods were used to clarify the nonlinear structures. Ultraviolet and visible spectrophotometer was adopted to measure the UV and visible light absorbance of down fibers. The peak of absorption curve appeared red or blue shift according to the different fractal dimensions. The relationship between the absorption peak and fractal dimensions was built up.
Study of the Hydrophobic Modification of Chromium Sesquioxide with Lauric Acid
Authors: Luo Shuang , Huo Ji Chuan , Lei Hong , Deng Jun
Published: June 2012

The surface modification of chromium sesquioxide with lauric acid was investigated, and the optimum technical condition was obtained according to the activation indexes of products, i.e. 1% of modifier in weight，70°C in temperature and 40 minutes in time. Contact angle, FT-IR, XRD and particle size distribution were conducted on both unmodified and modified chromium sesquioxide. The results indicate that lauric acid molecules are adsorbed on the surface of chromium sesquioxide chemically and new bonds formed. The surface modification does not destroy the crystal structure of chromium sesquioxide even though the particle size of chromium sesquioxide is reduced from 4.01μm to 2.71μm. The contact angle of the modified chromium sesquioxide with water is 143 °, which indicates that the surface of the chromium sesquioxide changes from hydrophilic to hydrophobic.
Adsorption of Cu (II) from Aqueous Single Metal Solutions by Bagasse Pith Chemically Modified with EDTA Dianhydride (EDTAD)
Authors: Ouyang Chang Li , Liu Xin Liang , Hu Fang , Nie Shuang Xi , Liu Jun Chao , Song Hai Nong
Published: June 2012

It was detail studied that the preparation of new chelating materials derived from bagasse pith for adsorption of Cu2+ ion. The bagasse pith was modified by the ethylenediaminetetraacetic dianhydride (EDTAD) and the mechanism of sorption property for heavy metal ion was studied. The FTIR was used to characterize the esterified pith(EP). The results show that the optimal conditions are 24 h of reaction time and 1.5 g of EDTAD dosage and the maximum adsorption capacity for Cu2+ is 76.76mg/g. The peaks at 1743.62 cm−1, 1598.59 cm−1,1408.06 cm−1 in FTIR suggest carbonyl functions in the materials. The Langmuir model can describe the process of adsorbing Cu2+onto EP.
Effects of BaF2 Addition on Properties of Strontium Barium Niobate Based Glass-Ceramics for Energy Storage Capacitors
Authors: Chen Guo Hua , Liu Tao Yong , Yang Yun , Zhang Wen Jun
Published: June 2012

The influences of BaF2 addition on phase composition, electrical property and energy storage density in strontium barium niobate based glass-ceramics prepared using melt-casting followed by controlled crystallization were investigated. The results indicate that adding 1wt% BaF2 improves the precipitation of Ba0.27Sr0.75Nb2O6 phase. However, the secondary phases, Ba3SrNb2O9 and BaBF5 are formed as the amount of BaF2 exceeds 3wt% when heated at 800°C/3h+900°C/3h in the glass-ceramics. The dielectric constant, microstructure, volume resistivity and breakdown strength are related to BaF2 content. The maximum breakdown strength (1450 kV/cm) and the energy storage density (5.1J/cm3) can be obtained in the glass-ceramic sample with 1wt% BaF2 addition, which would be suitable to be used as the dielectric materials for high energy storage capacitors.
Biological Performances of Titanium Scaffolds: A Review
Authors: Mediaswanti Kun , Wen Cui'e , Ivanova Elena P. , Berndt Christopher C. , Malherbe Francois , Wang James
Published: June 2012

Titanium and titanium alloys scaffolds have been widely explored in many load-bearing orthopaedic applications due to their excellent strength and corrosion resistance. However, their biocompatibility is also an important concern in these applications due to adverse reactions of metallic ions with the surrounding tissues after these metallic ions are released from implant surfaces. To respond on the challenge of producing a biocompatible material, a review on structural properties and surface treatments on titanium scaffolds and their effects on biological responses (in vitro and in vivo) are briefly presented.
Preparation and Properties of Ce-Zr-Mn Composite Oxide Oxygen-Storage Materials
Authors: Zhou Yong Qiang , Yin De Wu , Yang Xin Yu , Ma Jiang Hua
Published: June 2012

The low cerium oxygen-storage materials of Ce-Zr-Mn composite oxide were prepared by co-precipitation method. The materials were characterized by XRD,BET, OSC and so on. The results show that the precursor is prepared using ammonia as the precipitant at pH=10-13, T≥20°C. The precursor is calcined to form a fresh oxygen-storage materials at 700 °C for 5h. It has single crystalline phase -the solid solution Ce 0.45 Zr0.45-x Mn x Y 0.1 O 1.95 ,which has the cube structure of ZrO2 and contains Mn,Y. Phase structure in the materials is stable in the aging process.The addition of Mn in the oxygen-storage materials contributes to raise oxygen-storage performance of the materials. The materials has the better oxygen-storage performance and heat stability when Mn content in the materials is 0.03.
The Performance Study of the Open Channel Concrete in Cold Area
Authors: Tian Jin Liang , Niu Jian Gang
Published: June 2012

The antifreeze & seepage of the open channel projects is the most significant part in the rural water-reducing irrigation system. The prerequisite of the concrete durability is to ensure the concrete strength unchanged, and the concrete strength directly affects the durability. Using the Orthogonal Experimental Design (OED) Method analyzed that the affection on the concrete strength by replacing the ordinary silicate cement with the compound cement,and adding the Polypropylene Fiber (PF), Fly Ash (FA), Water-reducing Agent (WA) into the concrete. It is seen that the effect on the concrete with using the FA and the WA is significant while the PF has little effect on it, and get the mix proportion of the open channel concrete in cold area.
Research Progress of Energy Conservation Architectural Coatings
Authors: Zhang Zhong Qiang
Published: June 2012

At present, architectural coatings has been not only decorating for buildings, but also a lot of special functions, such as energy conservation, fire-proofing, self-cleaning, et al. Energy conservation coatings play an important role with the enhancement energy conservation consciousness. Research progress of energy conservation coatings was reviewed in this paper.
Influence of Nano-Clay on the Performance of phosphoaluminate cement
Authors: Wang Jian Lei
Published: June 2012

The influence of nano-clay on the physical and mechanical properties of the phosphoaluminate cement (PALC) was studied in the paper. The experimental results showed that nano-clay changed the water requirement of normal consistency and the setting time of phosphoaluminate cement. However its soundness was not affected by adding nano-clay. With 3% nano-clay added by weight of cement, PALC has an optimum compressive strength.
Influence of Sintering Temperature and Atmosphere on Phase Makeup of SiAlON-Graphite Composites
Authors: Wang Wen Wu , Cao Hui Yan , Wang Jin Xiang , Zhang Zhi Ping
Published: June 2012

Based on aluminum powder, Silicon powder, activated alumina and flake graphite as the main starting materials, SiAlON-Graphite composites were produced in N2 atmosphere. The influence of firing temperature and atmosphere on Si-Al-O-C-N system was investigated. It is proposed that the introduction of graphite produces a certain CO partial pressure and affects the nitridation of metal silicon, therefore reducing the mass change. In addition, large amount of 15R are formed through carbothermic reduction. CO hinders the growth of β-SiAlON. Z value of β-SiAlON in sample C with graphite is less than sample S without graphite.
Experimental Research on Durability of Fair-Faced Concrete
Authors: Cai Cheng Qiu , Guo Qing Song , Li Xin
Published: June 2012

Fair-faced concrete is a neotype constructional material. It is exposed to the natural environment directly as decorative walls in the acting process, so the request of durability of the concrete is much higher. Through comparison testing, data collection and analysis, find out the difference of durability of fair-faced concrete in different proportioning. It has positive significance to the selection of raw material and construction technology.
Experimental Study of the Characteristics of Damp and Efflorescence Mechanism for Building Brick
Authors: Lei Zu Kang , Zheng Jie Hong , Zhou Le
Published: June 2012

The damp and efflorescence for building bricks are the common disease of material. These phenomena may influence severely the building durability and indoor-air sanitation. From a macro perspective, the efflorescence of brick construction is related to the moisture condition of different masonry materials. Moreover, the growth mechanism of efflorescence has caused by the M.C. and the elapsed time being affected with damp and efflorescence from a micro perspective. Therefore, this article is focus on the mechanism of brick damp. This study uses systemic experimental design method and conducts a large number of fundamental experiment on damp and efflorescence of sand-lime bricks. From the microscopic measurement, the pathological mechanism of efflorescence for bricks and the variation on its M.C. are manifest. This research results may provide the suitable conservation strategies of repair engineering for reference.
Study on Water-Rock Interaction in Sea and Freshwater Transitional Zone
Authors: Ren Jia Guo , Wu Qian Qian
Published: June 2012

Study on water-rock interaction in transitional zone through the mixing of seawater and freshwater in different proportion and water-rock Interaction simulation experiments, In the mixing process of sea and freshwater, mixing is the basis of the mechanical mixing with complex chemical process, Total Alkalinity and pH values significantly increase, while the conductivity decreases significantly, calcite and gypsum saturation index increase significantly, while PCO2 reduces. In the course of water-rock role, the saturation indexes of gypsum elevate from -1.06 ~ -0.71 to -0.86 ~ -0.50 after interactions between mixed solution of various proportion and aqueous, which indicates that gypsum dissolves. The saturation indexes of calcite reduce from 0.69 ~ 1.07 to 0~0.10, which indicates that calcite precipitates in the process of experiment, calcite approaches to equilibrium in the end.
Mechanical Analysis and Numerical Simulation of Steel-Ring and Rigid-Frame Restrained Concrete
Authors: Wang Chen , Li Jia He , Wang Zheng
Published: June 2012

The complicated counterbalance system of steel ring and concrete-ring，rigid-frame and concrete-plate was analyzed and simplified under the restrain deformation and strains. The material parameters of early-age concrete are measured. Based on these work, the corresponding mechanical models were established and a special tool was employed for the meshing of model, and then, internal stress and strain induced by shrinkage of early-age concrete on restrained conditions were studied by FEM. The self-induced tensile stresses and strains in the restrain concrete can be calibrated，on the basis of which the elastic strains and tensile stresses would be calculated. So, the results of the numerical simulation reveal the law of the stress and strain distribution perfectly. It is significant to contrast the restraint characters of steel-ring and rigid-frame. The early-age shrinkage behaviors can be studied in depth.
Experimental Study on Rock Breaking with Impacting Water Jet by Modulation of Chaos
Authors: Tian Chang Liu , Cheng Xue Li , Wang Wei
Published: June 2012

The experiment focused on the contrast with rock breaking effect of impacting water jet by modulation of chaos and common cavitation jet. Investigated the influences of various water jet parameters and conditions on rock breaking, such as standoff distance, pump pressure, transverse speed and erosion time and the mass loss and erosion depth were measured in the experiment. The results show that the impacting water jet by modulation of chaos can efficiently use the energy of water jet and increase ability in rock-breaking, which will have a wide application prospect in high pressure water jet technology field.
Research on the Adobe Wall of Traditional Civil Structure Dwelling in Tianshui & Guanzhong
Authors: Meng Xiang Wu , Ye Ming Hui , Shi Hong Ru , Yan You Feng
Published: June 2012

The civil structure traditional dwelling have strong regional characters in Tianshui & Guanzhong .Through analysis of the characteristics of the adobe wall material, and to sum up the features of the construction techniques and structures , and puts forward the objective cause of the building materials of the large area used .
Service Life Prediction of Reactive Powder Concrete due to Seawater Infiltration
Authors: Ma Xin Wei , Ji Yu Yan
Published: June 2012

Reactive powder concrete (RPC) has a higher strengths, as well as excellent durability and corrosion resistance. So, it is expected to be increasingly used in marine engineering. In this study, After the RPC samples had been subjected to gradually increased high-pressure seawater for 30 days, the chloride contents in the samples along with the infiltration direction were calibrated on an energy dispersive spectrometer. On the basis of second Fick’s law, the chloride ion diffusion model and service life prediction model of reactive powder concrete in sea water are established. The service life of an actual reactive powder concrete structure could be predicted.
Study on Compaction Characteristics of Solidified Mud with Different Proportion of Curing Agent
Authors: Wang Chao Hui , Zhao Juan Juan , Wang Xiao Hua , Wang Xin Qi , Di Sheng Guan
Published: June 2012

The compacting curves of mud solidified by some curing agents, including cements, HSC301, CVC and CDK, were studied by heavy compaction tests. Based on this, prediction formulas for optimum water content and maximum dry density of solidified mud were regressed. Experimental results showed that the optimum water content of mud was increased and the maximum dry density reduced with the increasing amount of curing agent. Regression formulas were offered as a basis for the selection of mud curing agents.
Production of Bitumens from Coal Sources Modified by Elementary Sulfur
Authors: Smagulova Nazym , Kairbekov Zhaxsyntay , Ermek Aubakirov , Yermoldina Elmira
Published: June 2012

In present work the paths for obtaining the road oil bitumen are presented from the wastes of coal oil of the Karazhyra field. For the improvement of the quality of obtained bitumen the modification was carried out of elementary sulfur. The processes of modification by elementary sulfur allow to obtain the viscous road oil bitumen of high quality.
Research on the Influences of the Molding Processes of TOR Asphalt Rubber Mixtures upon the Pavement Performance
Authors: Kang Ai Hong , Zhang Qin , Li Ping
Published: June 2012

It’s a chemical method that adding TOR into asphalt rubber to be TOR asphalt rubber mixture. In this study, 70# basic asphalt from Nanjing Jinling Company and 60 mesh waste rubber powder from Jiangyan Honglei Company were chosen for the SMA13 grading and SUP13 grading by the best preparation technology. The high temperature stability, anti-cracking performance and water stability of TOR asphalt rubber mixture were studied and the influence of dry and wet molding process on road performance of TOR asphalt rubber mixture was compared. The results show that both the dynamic stability and the low-temperature cracking performance of wet forming specimens are better than the dry process. The water stability of wet molding process is also slightly better than the dry process. And expansion rate tests were carried out on asphalt mixtures prepared by dry and wet forming processes on continuous gradation and discontinuous gradation to validate the applicability of discontinuous gradation to asphalt rubber.
Review of Researches on Carbonization of Concrete: Influencing Factors and Forecast Models
Authors: Zhao Shun Bo , Chen Hua Xiao , Pan Li Yun
Published: June 2012

This paper reviews the state-of-art of researches on the carbonization of concrete. The influencing factors are concluded as two aspects as the internal concrete and the external environment and service conditions. The main internal factors include the cement and admixtures, the water to cement ratio, the concrete strength and others such as the type, grading and size of aggregate and the additives. The main external factors include the concentration and pressure of carbon dioxide, the temperature and relative humidity of environment, the curing and service conditions and the loading states. The typical forecast models of carbonized depth of concrete based on the fundamental reaction engineering principles, the lab experimental results and the practical engineering investigations are summarized for the reference of further study.
Study on the Rule of Temperature Descent for Large Stone Asphalt Mixtures
Authors: Feng Xin Jun , Ye Song , Hao Pei Wen
Published: June 2012

A study is presented to reveal the rule of temperature descent of large stone asphalt mixtures with different design thickness at different ambient temperature through the laboratory simulation test of large stone asphalt mixtures. The results show that the surface temperature dropped rapidly when the surface of large stone asphalt mixtures was in contact with air, then the cooling rate gradually decreased and the temperature difference between the surface and the middle of large stone asphalt mixtures maintained between 15°C and 40°C until the surface temperature dropped to the rolling end temperature. Ambient temperature and design thickness of large stone asphalt mixtures have great influences on its cooling rate.
Kyanite Ore Beneficiation Experimental Research in Hebei
Authors: Zhang Jin Xia , Feng Ya Li , Niu Fu Sheng , Chen Miao , Wang Xing Guo
Published: June 2012

As high-grade refractories raw material，kyanite is widely used and the market demand is increasingly greater. The kyanite in Hebei is complicated，main chemical composition is SiO2 52.87％、A1203 21.14％. The result of investigation on mineral processing technology show that desliming has a great influence on kyanite, especially acid process, the suitable lower limit particle size for desliming is 20μm. Magnetic separation process may remove iron-bearing minerals，and the iron removal rate is 87.78％．The optimum condition for magnetic separation is magnetic field conditions 1.0T. Base on the research, we can get concentrate with a grade of A1203 58.37% and a recovery of A1203 56.02% if we adopt magnetic separation and flotation technology.
Study on Influencing Factors and Control Measures of Diaphram Wall Panel Trench
Authors: Zhang Jun , Chen Huie , Cai Cheng Qiu , Shi Ming Yuan , Yan Huan , Chen Zong Fang
Published: June 2012

The stability of the slurry wall in the process of slurry supporting into slot directly affects the stability of the pit. This paper analyzes the key factors for deformation control, researches the influencing factors on slurry wall stability during slurry trenching and concreting for diaphragm wall, and proposes control measures to control the stability of slurry wall and matters need attention, which is of great significance to guide the foundation construction.
Problems and Solutions of High-Rise Buildings in Coupling Beam Design
Authors: Zhang Jin , Zhang Ya
Published: June 2012

Stress mechanism and failure forms of coupling beams in high-rise buildings are analyzed. Meanwhile, general principles and conceptual design methods of coupling beam design are put forward, along with some solutions on the over reinforced in the coupling beams that frequently occur in practical projects.
Evaluation of the Strain-Softening Law of Concrete from the Fracture Test
Authors: Tang Wai Ching , Cui Hong Zhi
Published: June 2012

This paper proposes a method for evaluating the linear stress-strain curve and bilinear stress-COD curve, suggested by Petersson, which can describe the tensile fracture behaviour of ordinary concrete satisfactorily. The two curves can be evaluated once modulus of elasticity (E), tensile strength (ft) and fracture energy (GF) are determined. It is proposed that the same fracture energy test suggested in the RILEM Recommendation be used to evaluate E, ft and GF. Firstly, the fracture energy was as usual evaluated from the area under the load-deflection curve. Secondly, the modulus of elasticity was calculated from the initial compliance in the same curve. Finally, the tensile strength was derived from the peak load. The proposed method was verified using some experimental data available in literature. The calculated values of the modulus of elasticity and the tensile strength were in good agreement with the corresponding experimental data. The method seems to provide a simple and practical way of evaluating the stress-strain and strain-softening curves of ordinary concrete, though further assessment is needed.
Study of the Effect of Boron Carbide Content in Concrete as Radiation Shielding Application
Authors: Yusof Mohd Reusmaazran , Abdullah Yusof , Samsu Zaifol
Published: June 2012

Keywords: Boron carbide, concrete, shielding, neutron, attenuation. Abstract. Boron carbide (B4C) is a ceramic material which is effectively absorb thermal neutron due to wide neutron absorption cross section. In this work, B4C is added into concrete as fine aggregates to test the attenuation properties by getting the attenuation coefficient of the concrete/ B4C. The samples of concrete/ B4C were exposing to the thermal neutron radiation source (241-Americium-Berylium) at the dose rate of 29.08 mR/h. The result show that the attenuation coefficient of the sample with 20wt% B4C is 0.299 cm-1 and the sample without B4C is 0.238 cm-1 and hence, concrete/ B4C is suitable as a shielded for thermal neutron radiation.
Contrastive Study on Mineralogy of Brazil Kaolinite and Beihai Kaolinite
Authors: Qiu Xiu Mei , Yan Chun Jie , Ma Yu Nan , Zhou Chun Yu
Published: June 2012

In this paper, the mineralogical characteristics of Brazil kaolinite and Beihai kaolinite have been researched. The structure and performance of samples were systematically analyzed by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and transmission electron microscopy (TEM).The results showed that Brazil kaolinite had inerratic pseudo-hexagonal morphology, low diameter-thickness ratio and a Hinckey index of 1.501. While Beihai kaolinite has irregular-polygonous morphology, higher diameter -thickness ratio and a Hinckey index of 1.197. The differences in structural make them have different physical properties.
Experimental Investigating of Latex Cement as Similar Material Simulating Soft Rock Creep
Authors: Wang Yong Yan , Li Feng , Tai Xiu Jiang
Published: June 2012

This paper takes styrene-butadiene latex with 37% solid contents, the portland cement of number 45r and fine sands with 0.2mm diameter to prepared similar material, the mass ratio of cement and fine sand is fixed, different ratio of the specimens are prepared by adjusting the latex ratio. The MATLAB fitting and ANSYS simulation calculation are used to compare to the date of soft rock. The analysis shows that the latex cement can be used for deep soft rock rheology theory and polymer materials similar simulation experiment.
Study and Application of a Modified Agent GHPC-1 for Green High-Performance Concrete
Authors: qin wang , Li Chong Zhi , Liu Jun Chao , Xu Mo Yi
Published: June 2012

A modified agent GHPC-1 for green high-performance concrete was composed of the strength-increasing groups of organic alcohol amine, the slump-retaining groups of carboxylate polymer and the workability-stabilizing groups of amide. It could be used through substituting some of polycarboxylate water-reducers or combining with polycarboxylate water-reducers to modify the workability of fresh concrete and to increase the strength of hardened concrete. The adaptability tests of cementing materials with admixtures show that the dispersing ability was almost not influenced but the retaining ability of paste flowing was evidently enhanced if the substitution of polycarboxylate water-reducers have been to 20 %. The comparative tests of concrete indicated that as 20 % content of GHPC-1 was added in polycarboxylate water-reducers, it could modify the concrete workability. If adding 0.6 % with polycarboxylate water-reducers it could save water by 5 % and cement 10 % and simultaneously modify the workability and to enhance the strength, or to reduce water by 2.5 % and increase the strength of 28 d by 5~8 MPa.
The Engineering Technology Index Analysis of the Low-Carbon Building
Authors: Qi Bao Ku , Zhao Jing Ming , Qu Yu
Published: June 2012

Low-carbon building is the new building types under the background of low-carbon economy. Compared with traditional architectural form, the cost and benefit of the low-carbon building have changed a lot; therefore, it is necessary to analyze the low-carbon building from the perspective of cost and benefit. This paper structured an analysis mode through the cost-effective method, and also provided a new analysis idea and approach to value the low-carbon building, so it has an important referential value for the promotion and construction of low-carbon building in the whole society.
A Novel Hydrophobic-Induced Method for Water Soluble Silk Fibroin
Authors: Wang Ya , Li Pei , Zhu Chen Hui , Fan Dai Di
Published: June 2012

A new hydrophobic method of regenerated silk fibroin was introduced here, in which glycerol was used as the inducer. As a consequence, the soluble form of silk was transformed into hydrophobic form, which hence suggests glycerol has a significant effect of hydrophobic induction. Then the morphology and mechanical properties of the hydrophobic silk fibroin was respectively shown by scanning electron microscope (SEM) and strain test. The results showed induced silk fibroin had a compact surface and good mechanical property. Finally, the induction mechanism of glycerol was discussed that glycerol could soften the fibroin’s structure during dry process ,which was the main reason leading to β-sheets of fibroin partly being rebuilt and then the hydrophobic transformation being achieved.
Study on the Structural and Aseismatical Performance of Multi-Storey Ancient Chinese Timber Structure Shangyou Tower of Palace Style
Authors: Gao Da Feng , Li Peng Fei , Wang Lei
Published: June 2012

Based on the rich previous experimental data, the multi-storey ancient Chinese timber structure shangyou tower of palace style was studied. ANSYS10.0 software was used to establish the finite element models. One finite element model of large wooden frame was established by applying semi-rigid spring element to simulate the joint of mortise-tenon, tou-kung and the connection on column foot in the real wooden structure. The other finite element model of antique building corresponding to the finite element model above was established. The first 10 inherent frequencies and vibrations of the two models were obtained by the method of Block Lanczos with full transient analysis. The model displacement and acceleration time history curves were obtained by taking the two models subjected to El-Centro ground motion, Taft ground motion and Lanzhou artificial ground motion excitation. By the results analysis of the two models, it can be find that the vibration isolation performance of the ancient Chinese timber structure mainly manifests in the column foot, tenon and mortise connection and the tou-kung layer.
Study of Micro-Inclusion of Beam Blanks
Authors: Tai Wei , Gao Ju , Du Cheng Liang
Published: June 2012

According to the three kinds of MRT3-BA steel technological processes, which include BOF→LF→CC, BOF→RH→CC and BOF→LF→RH→CC, some systematic analysis are introduced to research on the contents of T[O] and [N], and the type, composition and quantity of micro-inclusions in the three processes. The level of cleanliness in billet will also be systematic analysed in comparative. The results of the study show that the contents of T[O] respectively are 20.8×10-6, 14.3×10-6 and 13×10-6 in billet of Process 1, Process 2, Process 3. Through the comparison with production data of other manufacturers, control of T[O] has reached a high level in MRT3-BA deep punching steel. The numbers of micro-inclusions respectively are 6.8/mm2, 5.66/mm2 and 5.36/mm2 in billet; the control level in MRT3-BA steel has reached domestic advanced level. Taken steel cleanliness and production cost into account, the better technological process of MRT3-BA stamping steel is BOF→RH→CC.
The Influence of Interface Silicon Oxide Layer on Photovoltaic Effect of Iron-Doped Amorphous Carbon Film/SiO2/Si Based Heterostructure
Authors: Li Rong , Tan Xin Yu , Huang Yue Hua , Liu Yuan , Liu Qin Qin
Published: June 2012

This paper studied the impact of silicon oxide layer on photovoltaic characteristic of iron-doped amorphous carbon film/silicon heterojunction (a-C:Fe/Si). The results show that a native SiO2 layer on the silicon surface can provide a significant improvement of the a-C:Fe/Si devices’ photovoltaic performances, especially for the short circuit current and fill factor. This improvement partly may be attributed to the electron recombination process is suppressed and the interface is modified by the SiO2 film based on the open circuit voltage decay measurement.
CdTe Solar Cells on Flexible Metallic Substrates
Authors: Wu Jing Jin , Wu Hong Cai , Zhao Ce Zhou
Published: June 2012

After reviewing the development of CdTe solar cells, the merits of superstrate and substrate configuration have been discussed. Then, the material process techniques are investigated according to their application, following with discuss at the challenges.
Preparation of Zirconia-Yttrium Fibres from Steady Precursor by Sol-Gel Technique
Authors: Xu Pei Pei , Wang Xin Fu , Fu Shun De , Xu Jian Feng
Published: June 2012

Polycrystalline tetragonal Y-ZrO2 fibres were fabricated via sol-gel technique by the centrifugal filament method using zirconium oxychloride octahydrate as the raw material. The spinnable zirconia sol was obtained by concentrating the solution, which the molar ratios of H2O2/ZOC and HA/ZOC were 3.0 and 0.5-1.0, respectively. FT-IR, TG/DTA, XRD and SEM were used to characterize the chemical composition and morphology of zirconia fibres. The bridging bidentate coordination between the carboxyl group and zirconium polymer can promote the spinnability of sols. The polycrystalline zirconia fibres structures are metastable tetragonal phase after heat treatment at 1200°C in 1h. The distribution of fibres is not uniform with a diameter from 5 μm to 10 μm. The single fibre has a uniform diameter and smooth surface, without any defect on the surfaces. The grain size of ZrO2 fibers increases with the heat treatment temperature gradually.
Thermoelectric Power Generation System with Loop Thermosyphon and TiO2-Nanofluids
Authors: Jang Ju Chan , Rhi Seok Ho , Lee Kye Bock , Lee Ki Woo , Kim Sun Kook , Kim Sung Hun , Lee Won Gook , Kim Nak Keun , Shin Dong Ryun
Published: June 2012

Thermoelectric module (TEM) systems proposed in this study adopts loop thermosyphon with TiO2-nanofluid as working fluid. The present experimental study is focused on the optSubscrSubscript textipt textimum operating condition of the TE system proposed to improve energy output and to obtain stable power generation to be used in future hybrid vehicles. The results of the present study indicate a possibility to use such loop thermosyphon TEMs for future thermoelectric hybrid automotive vehicles. The system showed the optimum performance with acetone with 50% charged amount as the working fluid for the TLT. The system with the new working fluid, nanofluids, neither improved its performance nor its stability.
The Preparation and Characterization of a Novel Biodiesel Named Curcas Oil Diethylene Glycol Ether Ester
Authors: Jiang Da Yong
Published: June 2012

A novel biodiesel named curcas oil diethylene glycol ether esters (GDGEE) with higher oxygen content was prepared by refined curcas oil, methanol and ethylene glycol monomethyl ether as the reaction and KOH as catalyst. The optimum synthesis conditions was determine by orthogonal test, that molar ratio of methanol to oil was 6:1, catalyst amount was 1.2% of feed oil, reaction temperature was 65°C, reaction time was 30min. Both FT-IR and 1H-NMR were used to analysis and validate the molecular structure of GDGEE after preparation. The Physicochemical properties including oil-soluble, smoke point, kinematic viscosity, pour point, copper corrosion and closed cup flash point, were all tested by the national standard method for GDGEE and its blends with 0# diesel oil. The results confirm that GDGEE owns good physicochemical properties which can be used as diesel fuel additives or be used instead of diesel fuel alone, so a certain application value of it can easy be know accepted.
Polymermetallic Catalysts with Nano-Sized Particles on the Basis of the Palladium and the Potassium Humate
Authors: Elmira Ermoldina , Zhaksyntay Kayrbekov , Nazym Smagulova , Gulzira Vassilina , Nurzai Rejiafu
Published: June 2012

Abstract. In this work the results of research are presented of humic preparations used as natural polymer modifiers for the palladium catalysts. New nanosized catalysts on the basis of palladium - potassium humate are synthesized, extracted from coals of Oy-Karagay and Kunming fields (People's Republic of China). The highest activity is shown on the catalysts of 0,8 % of the Pd- Humic acids (Oy-Karagay) of 1 % / bauxite-094.
Theoretical Study of the Electronic Structures of Li-Doped ZnO
Authors: Wan Qi Xin , Chen Jia Yi , Xiong Zhi Hua , Li Dong Mei , Shao Bi Lin , Liu Guo Dong
Published: June 2012

The first-principles with pseudopotentials method based on the density functional theory was applied to calculate the geometric structure, the formation energy of impurities and the electronic structure of Li-doped ZnO. In the system of Li-doped ZnO, LiZn can not result in lattice distortion. In contrast with that case, LiO and Lii result in lattice distortion after Li doping in ZnO. In Li-doped ZnO, LiO is the most unstable than the other cases. Simultaneously, Lii is more stable than LiZn according to that Lii has smaller formation energy. Furthermore, the electronic structure of Li-doped ZnO indicates that that LiZn behaves as acceptor, while Lii behaves as donor. In conclusion, in Li-doped ZnO, Lii is always in the system to compensate the acceptor. Singly doping Li in ZnO is difficult to gain p-ZnO for the self-compensation. The results are in good agreement with other calculated and experimental results.
Waste Paper Application in Geotechnical Project
Authors: Chegenizadeh Amin , Nikraz Hamid
Published: June 2012

Composite soils have been widely used in civil engineering applications, especially in slopes, embankment dam and landfills. This paper aims to investigate effect of fiber inclusion on shear stress of composite soil (i.e. clay composite). A series of laboratory direct shear tests carried out to evaluate paper reinforcement effect on strength behavior of composite clay. Kaolin clay was selected as soil part of the composite and paper was used as reinforcement. The paper reinforcement parameters differed from one test to another, the paper length was changed from 10 mm to 30 mm and paper content were varied from 5% to 15%. Normal stress kept constant at 150 kPa. For each test, stress_ displacement graph derived and the results were compared. The results proved that inclusion of paper reinforcement affected strength behaviour of clay composite so that increasing in paper reinforcement content and length caused increasing in shear stress.
A Free-Lead and Cadmium of Antimony Ruby Glass Composition and its Preparation Method
Authors: Tang Hua Juan
Published: June 2012

The antimony ruby glass is prepared by soda-lime silica system as matrix composition which coefficient of linear expansion is appropriate for the ordinary glassware.UV-VIS spectrometer is used to measure the transmittance curves of various amount Sb2O3 glasses Relation between amount Sb2O3 and transmittance of antimony glasses are investigated which indicates that the tSuperscript textransmittance of antimony glass becomes lower with Sb2O3 amount increasing. Comparing un-treatment with heat treatment antimony glass, the dominate wavelength moves toward the red wavelength and the pure color increases.
Assessment of the Effects of Land Use Change in Upper Catchments of Lake Kivu on its Water Quality
Authors: Bazimenyera Jean De Dieu , Fu Qiang , Théophila Niragire
Published: June 2012

This paper analyzed the effects of land use change in the catchment area of Lake Kivu on its water quality. The results of laboratory analysis of water samples from 4 locations testing the concentration of major elements showed that Mn, N, P and K are high during the growing and raining seasons and low during the dry and harvesting seasons. They also indicated that the concentrations of Cr, Al were considerably low in all seasons but vary with the seasons at Nyamasheke and Karongi stations. The variations of other major elements were not depending on the seasonal variations.
Optimization of Preparation Process of La-Ce-Palygorskite Catalysts for NO Decomposition by Response Surface Methodology
Authors: Zou Jian Guo , Zhang Zhi Hong , Liu Shi Ying , Luo Ping
Published: June 2012

Response surface methodology(RSM) was applied to optimize the preparation process of La-Ce-Palygorskite catalysts for NO decomposition. The method of three-factors-three-levels central composition experiments were designed. The pH value of the chemical blending, ratio of La/Ce and calcination treatment temperature of the catalysts were chosen as casual factors. With RSM, the effects of these 3 factors on the response value was investigated. It has been found that the most active La-Ce-Palygorskite catalyst for NO decomposition can be prepared when the rare earth content, La:Ce, pH value of the chemical blending and calcination treatment temperature were 2%, LaxCe(1-x)(x=0.55), 6.5 and 409 °C, respectively. The denitration rate of the catalyst could be up to 66.58% under reaction conditions.