bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Preparation and Properties of Backfilling Cementation Material Based on Blast Furnace Slag
Authors: Hu Shu Gang , Lu Xian Jun , Niu Hai Li , Jin Zi Qiao
Published: November 2010

The blast-furnace slag (BFS) has been characterized by chemical and phase composition to evaluate its hydration reactivity. It has high potential activity for its glassy structure, so its use to prepare new filling cementation material is possible. New backfilling cementation material composition has been formulated and optimized by activation of BFS. The optimal formula of new backfilling cementation material SL(Slag activated by lime) and SLG(Slag activated by lime and desulfurization gypsume) was 87% BFS ,13% lime and 78.4% BFS, 11.8% lime, 9.8% desulfurization gypsume respectively. Finally, the feature of cementation properties was analyzed through comparison between new cementation material and ordinary Portland cement with compressive strength, water requirement of normal consistence, setting time, bleeding water and slump. The result showed that material SL and SLG have superior performance to ordinary Portland cement used to mining cemented filling.
Research on Process Mineralogy of Potassium-Rich Shale
Authors: Liu Jie , Han Yue Xin , Yin Wan Zhong
Published: November 2010

The process mineralogy of potassium-rich shale from Chaoyang of Liaoning, China, was studied. Research results showed there are much less variety and smaller quantities in mineral compositions. Calculated mineral composition by means of chemical composition analysis combined with XRD, MLA, IR and TG-DSC analyses showed that main minerals with were Potassium-feldspar, muscovite, biotite and illite, and gangue minerals were quartz and small amounts of hematite. Potassium-rich minerals such as potassium-feldspar and muscovite contact smoothly with quartz respectively, and there was the direction arrangement among potassium-feldspar, quartz and muscovite in the shale. And quartz and hematite were main cement in the shale. The influences of the research results on the potassium extraction from potassium-rich shale were distinct.
Synthesis of Hydrotalcite Using Brucite as the Source of Magnesium
Authors: Tan Qi , Yin Wan Zhong , Zhang Li Li , Liu Lei
Published: November 2010

The hydrotalcite was synthesized using brucite as the source of magnesium by the method of coprecipitation. The effect of synthesis parameters, such as Mg2+ concentration of solution, crystallizing time and temperature on their crystal structure were studied. The surface morphology was characterized by SEM, and the structure was characterized by XRD. Characterization of hydrotalcite showed that the particle size of the hydrotalcite with high degree of crystallinity was 10.0～0.1μm, and the Mg2+ concentration of solution, crystallizing time and temperature influenced the crystal structure. The proper Mg2+ concentration was 0.12M, and the optimal crystallizing time and temperature were 8h and 80°C, respectively.
Synthesis of LiNi1/3Co1/3Mn1/3O2 Composite Powders by Solid State Reaction
Authors: Zhang Li , Zhang Pei Xin , Fan Zhen Zhen , Ren Xiang Zhong , Zhang Dong Yun , Liu Kun
Published: November 2010

A mixture of Li2CO3, NiO, Co2O3 and MnO2 with a molar ratio was introduced in the mixed high energy ball milling, LiNi1/3Co1/3Mn1/3O2 was prepared by solid state phase using mechanochemical activation which has highly reactive materials. The structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were analisised by employing X-ray diffraction(XRD), scanning electron microscopy(SEM) and galvanotactic charge-discharge test. Charge-discharge test results show that when the the LiNi1/3Co1/3Mn1/3O2 cathode was prepared by wet milling 10h between 2.8 V and 4.4V at a current of 0.5C rate, the initial discharge capacity is 135.1mAh/g, the capacity retention rate of 93.26% after 20 cycles. When nLi: n (Ni + Co + Mn) = 1.1, the samples sintered 20h at 850 °C, the first discharge capacity is 148.5 mAh/g, and the capacity retention rate is 94.88% after 40 cycles.
Experimental Research on Adsorption of Cadmium with Synthetic Tobermorite from Wastewater
Authors: Qi Hong Bin , Du Hai , Yin Cong Cong
Published: November 2010

Tobermorite nano-scale powder was synthesized from potassium feldspar ore from Henan province Lushi country in China. In the present research work, its adsorption property to Cd2+ was studied. The factors of adsorption such as pH values, traction time, initial concentration, and temperature were studied. The adsorption equation was curvefitted by the Langmuir and Freundlich adsorption isotherm and the thermodynamics adsorption was analyzed. By the orthogonal experiment and single-factor experiment of the adsorption, the optimized conditions of the adsorption for Cd2+ were achieved: the reaction temperature is 40°C, the reaction time is 20 min, the initial concentration of aqueous solution is 20 mg•L-1 and pH value is 6.0. Under these conditions the adsorption efficiency of Cd2+ can reach 99.89%. The orthogonal experimental results show that the order of effect on adsorption efficiency was the initial concentration, pH value, reaction temperature, reaction time. In different temperatures, the results show that isothermal Langmuir equation can describe the isothermal adsorption characteristics of Cd2+ on tobermorite. Thermodynamic parameters can be drawn: the G was negative and with increasing temperature H increased, so the adsorption process is a spontaneous reaction to the heat.
Research on Impact of Grouting Material on Seismic Performance of Tunnel in Soft Soil
Authors: Yang Zhi Yong , Huang Hong Wei , Yue Jun
Published: November 2010

In order to use existing conditions with requiring no additional cost to improve the seismic capacity of tunnel in soft soil, the impact of grout on seismic performance of tunnel is studied and analyzed in the current paper. The compression modulus of grout could vary to the proportion of materials. The test results show which materials benefit for the compression modulus enhancing. And the results show relative displacement between top and bottom of tunnel, which is an important seismic performance index, decreases with the Es of grout increasing in certain range. Though the Es of grout should be larger than the Es of soil around the tunnel, it is unnecessary to pursue the over high Es of grout. It is necessary to take it into consideration for grout selection so that the tunnel could have better seismic capacity.
Study of Low-Carbon Economy and Low-Carbon Building Materials
Authors: Sheng Bao Zhu , Chen Xiao Juan
Published: November 2010

Building material industry which belongs to High-carbon is facing severe challenges and great opportunity when coping with global climatic change. Low-carbon is an inevitable trend that economy grows. Low-carbon economy is the backbone for economic transition and also the right way for people move towards future .By means of structural adjustment and technology innovation building material industry is destined to achieve full vitality in the transition to the low-carbon economy.
Effect of Hydrogen Bonding Interaction on the Properties of Caprolactam-Modified Casein/Waterborne Polyurenthane Composite
Authors: Ma Jian Zhong , Xu Qun Na , Gao Dang Ge , Zhang Jing Yi , Ma Yan Xiao
Published: November 2010

Caprolactam modified casein(CA-CPL) was prepared by using casein and caprolactam firstly. Caprolactam modified casein/waterborne polyurethane composite (CA-CPL/WPU) was prepared from CA-CPL and WPU. Effect of compounding conditions, such as the WPU dosage, compounding temperature and compounding time on CA-CPL/WPU performance were investigated. The results indicated that: CA-CPL/WPU achieved superior comprehensive performance when the WPU dosage was 50%, the compounding temperature and the compounding time was 80°Cand 2 h respectively. Viscosity of CA-CPL/WPU decreased firstly with the increasing amount of WPU When the WPU dosage was lower than 30%, and then increased gradually when the WPU dosage was higher than 30%. The more the dosage of WPU used in the reaction, the less dilution stability CA-CPL/WPU had. Acidic resistance, alkali resistance and electrolyte resistance of CA-CPL/WPU seemed to be invariable after WPU was introduced , but water resistance and softness of the film were improved. FT-IR and DLS results indicated that via the compounding process, certain hydrogen bonding interaction in CA-CPL/WPU took place and the obtained CA-CPL/WPU had a small Z-average size and polydispersity.
Load-Carrying Capacity of Glass Panel on Different Wind Pressure Conditions
Authors: Wang Na , Ma Juan Rong , Liu Hai Bo
Published: November 2010

The variable regulation of maximum principle stress and deflection of glass panel in hidden curtain wall were analyzed by using uniform negative and positive wind pressure tests. The curve of maximum principle stress and deflection were compared in the two different wind pressure conditions. The glass panel used in specimen is monolithic toughened glass. The dimension of the glass panel is 1000mm×1000mm and its thickness is 6mm. The dimension of silicone structural sealant is 12mm×8mm. Test result indicated that the maximum principle stress and deflection of every test point increase linearly with the increasing of the uniform load from 0.5kPa to 2.0kPa; the curve of maximum principle stress and flexural performance of glass panel have obvious differences when the specimen was tested in negative and positive wind pressure. When the glass panel was tested in positive wind pressure, its load-carrying capability was better than it was tested in negative wind pressure. The flexural performance of glass panel was also in the same way.
Chemical Strengthening of Erbium Phosphate Laser Glass by Ion Exchange
Authors: Fang Yong Zheng , Xu Jia Yue , Wang Zhan Yong , Hu Li Li
Published: November 2010

Two kinds of Er-doped lithium phosphate glass have been chemically strengthened by ion exchange in a mixed binary melt of KNO3 and NaNO3 at temperature far below glass Tg. Ion depth profile has been determined with WDS technique. The effect of acid wash on surface morphology, hardness and fracture temperature of glass was investigated. It was found that acid wash following ion exchange could improve the surface morphology and strength of glass. Nevertheless, WDS analysis showed that the acid wash could cause the ion diffusion from glass surface to acid wash liquid, i.e. the back diffusion of K+ and Na+. The results revealed that the back diffusion of K+ was severer than that of Na+ during acid wash and the bond of K+ to glass network was weak.
Experimental Research on the Optimal Operation Mode of Integrated Oxidation Ditch with Continuous Flow and Intermittent Aeration
Authors: Jiao Bin Quan , Li Dong Wei
Published: November 2010

The influence of HRT , oxidic time and anoxidic time on the carbon and nitrogen removal of integrated oxidation ditch with continuous flow and intermittent aeration was studied by cross experiment method. The results show that the anoxidic time has the most distinct influence on removal ratio of BOD5 and TN in the system and the oxidic time has a distinct influence on BOD5 as well .When HRT , oxidic time and anoxidic time of the system is 8h , 2 h and 2 h respectively , the effluent quality and the removal ratio for BOD5 are <20 mg/ l and 85. 2 % and for TN are < 20 mg/ l and 55. 5 % respectively.
Generalized Electromagnetic Energy Density in Time-Dependent Composite Media
Authors: Tan K.B. , Liang C.H.
Published: November 2010

The Lorentz medium model for magnetization is modification, through which the whole Lorentz models become more symmetric one than traditional forms used in [3-5]. The modification can also have the deduction for more general Poynting’ theorem in dispersive media became a regular procedure. As an application, those forms of energy density in [4, 5] are special cases of generalized one shown in the letter under the establishment conditions for time-independent situation.
Probing of Iron Ore “Plus Calcium Oxide Grade"
Authors: Zhang Zhi Xia , Yin Hai Sheng
Published: November 2010

A new concept, “Plus Calcium Oxide Grade”, was put forward, which is the very mass percentage of iron element when Calcium Oxide addition fulfills the need of the basicity of the blast furnace slag. The “Plus Calcium Oxide Grade” and “Minus Calcium Oxide Grade” of iron ore, iron concentrate, sinter and pellet was calculated, analyzed and also compared. The results showed that: the Plus Calcium Oxide Grade can reflect the smelting value more objectively and reasonably, while the basic grade and “Minus Calcium Oxide Grade” can not. So it is suggested that the concept of “Plus Calcium Oxide Grade” can be brought into the iron ore dealing and using, and also into the area of iron concentrate, sinter, pellet and furnace mixture.
Oxidation Behavior of Stainless Steel with Electroless Ni-Fe-P Coatings
Authors: Geng Shu Jiang , Wang Qian
Published: November 2010

Ni-Fe-P coatings were deposited on ferritic stainless steel by means of electroless method. The oxidation behavior of the steel with these coatings were investigated at 800°C in air. The mass gain of the steel with Ni-Fe-P coatings deposited from solutions with different mass ratios of FeSO4 to NiSO4 decreased with increasing mass ratio. For the steel with Ni-Fe-P coating deposited in the solution with 0.25 of the mass ratio, the mass gain increased with the increase in oxidation time. While the mass gain of the steel with coatings deposited in solution with 0.5 and 0.75 of the mass ratio, respectively, became stable after 10-h oxidation. Compared with Ni-P, The Ni-Fe-P coatings improved the spallation resistance of the surface oxide scale. The oxide scale formed the bare steel consisted of Cr2O3 with TiO2 and (Mn,Cr)3O4 spinel. However, the oxide scale thermally grown on the steel with Ni-Fe-P coatings was composed of NiO, (Ni,Fe)3O4 spinel and Cr2O3.
Study on the Properties and Cytotoxicity Assessment of Nanostructure Copper-Cerium Model Catalysts Prepared by Coprecipitation Approach
Authors: Hung Chang Mao
Published: November 2010

Since the growing interest in the manufacture and environmental applications of composites consisting of CuO and CeO2 nanoparticles. This work describes the CuO/CeO2 nanoparticle materials were synthesized by coprecipitation approach with aqueous solutions of copper nitrate and cerium nitrate. The nanocomposite particles were characterized by HRTEM, with a particle size around nanoscale particle sizes (~10 nm) with high dispersion phenomena. Further, cell cytotoxicity and the percentage cell survival was determined by using 3-(4,5-dimethylthiazol-2-yl)-5(3-carboxymethoxyphenol)-2-(4-sulfophenyl)-2H-tetrazoli um (MTS) assay on human fetal lung tissue cell (MRC-5). The experimental results show that the CuO/CeO2 nanoparticle materials only minor cause cytotoxicity effect in cultured human cells.
Novel Preparation Technology of SBS Modified Asphalt
Authors: Yu Dan , Huang Pang , Xiang Li , Cheng Jian
Published: November 2010

Colloid mill or high-speed shearing mechanical is used in traditional preparation technology of SBS modified asphalt for the dispersion of SBS in matrix asphalt, which leads to the high equipment cost in production of SBS modified asphalt. The fractions oil of FCC slurry oil distillation with a high content of aromatics is a good swelling agent of SBS. The FCC distillation residual (FR) with high softening point can resolve the problem that penetration increased when the addition of swelling agent increased. SBS is pre-swelled by the heavier fractions from FCC slurry oil, and then it will be dispersed in the vacuum residuum (VR) by simple mechanical stirring to prepare SBS modified asphalt due to the perfect swelling effects in this work. The influences of different materials, distillation yield and ratio of FR to VR on the performance of SBS modified asphalt have been investigated. Fluorescence microscopy was applied to observe the different disperse images of SBS modified asphalt prepared by simple mechanical stirring and high speed shearing. The results indicated that the novel method can be used to prepare SBS modified asphalt with good performance and storage stability.
Preparation Technology and Performance Analysis of Crumb Rubber and SBS Composite Modified Asphalt Binder
Authors: Xiang Li , Wang Zhi Gang , Du Ying , Cheng Jian , Que Guo He
Published: November 2010

Based on the characteristics of SBS modified asphalt (SBSMA) and crumb rubber modified asphalt (CRMA), crumb rubber and SBS composites modified asphalt (CR/SBSCMA) technology is proposed combine the advantages of crumb rubber and SBS. The preparation technology and production process factors have been discussed in this work. Moreover, the performance comparison results of three modified asphalts confirms that CR/SBSCMA could achieve good high and low temperature performance with low content of SBS and crumb rubber. Furthermore, the separation behavior of CR/SBSCMA has been analyzed, the experimental results indicate that the separation behavior of CR/SBSCMA is caused by the sinkage of rubber particles as well as CRMA. However, the softening point difference of CR/SBSCMA after separation test is smaller greatly than CRMA due to the prevention of SBS particles.
Fabrication, Characterization and Adsorptive of Human Fibrinogen of HA/PHBV Nano Composite Films
Authors: Yuan Jun , Zheng Qi Xin , Cheng Jian
Published: November 2010

In this investigation, nano-scale hydroxyapatite (HA) particles were incorporated in poly(hydroxybutyrate-co-valerate) (PHBV) polymer to fabricate composite films using solvent casting method. The morphologies, mechanical properties and adsorptive of human fibrinogen of the composite films were investigated. The HA nano-particles were dispersed in the films and well bonded to the polymer. The strength of films could be enhanced and its adsorptive of human fibrinogen could be also improved greatly by introducing HA nano-particles into the films. The results suggested these newly developed nano-HA/PHBV composite films might serve as an effective biomedicine material.
Mesh Generation for Ellipse Particles of Composite Solid Propellant
Authors: Yang Wei Jun , Zhao Jiu Ling , Guo Suo Li
Published: November 2010

For analyzing the effect of different particles composing and distributing on composite propellant, it is necessary to generate mesh for the elliptical particles in composite propellant. A mesh automatic generation method is designed for the elliptical particles. This method is according to force-equilibrium mesh generation algorithm. And distance function and mesh size function is designed for the method. The program is in Matlab. The result shows that the method can automatically generate mesh and the mesh quality is good.
The Magnetic Properties of FeCuNbSiB Flake Particles Prepared by Milling the Annealed Ribbons
Authors: Yang Wei Feng , Qiao Liang , Wang Tao , Li Fa Shen
Published: November 2010

The amorphous FeCuNbSiB ribbons were first annealed at the temperature of 450 oC and 540 oC, respectively. Then, these annealed ribbons were milled into flake particles with the same condition. The different annealing temperature made the ribbons have the different crystallinities, which caused the milled particles have the different structures, morphologies, and magnetic properties. As for the flake particles by milling the ribbons annealed at 540 oC, they had higher crystallinity, smaller size, lower coercivity, and higher complex permeability compared with those by milling the annealed ribbons at 450 oC.
Preparation of N-Acetylchitooligosaccharides by Enzymatic Hydrolysis of Chitosans
Authors: Zhu Hong , Qiu Zhi Hui , Hou Qiong
Published: November 2010

An economical production process of higher N-acetylchitooligosaccharides [(GlcNAc)n, n=5~7 ] was developed with enzymatic and chemical reactions in this study. (GlcNAc)n were prepared selectively and efficiently by hydrolysis of chitosans with cheap enzyme preparations including cellulase TV, cellulosin A.C and hemicellulase, followed by N-acetylation with acetic anhydride. Higher (GlcNAc)n could be obtained in high yields by using cellulosin A.C and hemicellulase, which are originated from Aspergillus niger.
Preparation of N-Acetyl-D-Glucosamine by Enzymatic Hydrolysis of Amorphous Chitin
Authors: Zhu Hong , Hou Qiong
Published: November 2010

Several crude enzymes including cellelase Tv, hemicellulase and lipase, papain as well as cellulase Ac were examined for the effective production of N-acetyl-D-glucosamine (GlcNAc) from amorphous α-chitin. Among the tested crude enzymes, cellulase Tv was found to be the most effective for directly degrading amorphous α-chitin to GlcNAc. High yield of GlcNAc was achieved by choosing the optimum hydrolytic conditions at pH 4.5 and 37°C. By gradually adding, in three tantamount cases, the amount of cellulase Tv to amorphous α-chitin, the yield of GlcNAc reach 55.0%.
Curing Reaction and Kinetic Parameters of Diallyl Orthophthalate Resin with Initiator Dicumyl Peroxide
Authors: Yue Xiao Qin , Mei Qi Lin , Huang Zhi Xiong , Wen Peng , Huang Ling
Published: November 2010

The curing reaction of diallyl orthophthalate(DAOP) resin, which was initiated by dicumyl peroxide(DCP), was studied by Fourier transform infrared spectroscopy(FTIR). Differential scanning calorimetry(DSC) was used to determine the curing behavior and kinetic parameters of dicumyl peroxide (DCP) / diallyl orthophthalate (DAOP) system. The results clarified that the curing reaction of DAOP resin could be initiated by DCP at 150-180°C and the reaction heat diffused slowly in curing process. The gel-temperature, curing temperature and thermal treatment temperature of the DCP(3%)/DAOP system were 145.46°C, 166.03°C and 173.83°C. The apparent activation energy, frequency factor and reaction order were 130.200kJ/mol, 5.231×1010 and 0.9455, respectively.
Research on Mechanism of Electrical Transport of Carbon Aerogels
Authors: Feng Ya Ning , Yang Rong , Ge Li Ling , Jiang Bai Ling , Tanemura Masaki , Miao Lei
Published: November 2010

To have a fundamental understanding on the principle of carbon aerogels when it is used as electrode materials in power battery, the effects of density and structural properties on the electrical conductivity of carbon aerogels was investigated in this paper. Carbon aerogels with different density were prepared via adjusting the chemical conditions of the primary solution. The morphology of carbon aerogels were observed by field emission scanning electron microscopy (FE-SEM). Experimental results show that the electrical conductivity of carbon aerogels is ranged from 10-6 Ω/cm to 10 Ω/cm, and that not only the density but also the carbon particle size and porosity of carbon aerogels effect the transport property greatly. With the increasing of the density the electrical conductivity of carbon aerogels increases. This indicates that larger particle size and lower porosity of the nano-structure lead to higher conductivity.
Low Temperature Floor Radiate Heating System Designed Especially for Large Room Located in Cold Area
Authors: Gao Li Fu
Published: November 2010

Highlighted with its advantage of convenience, low energy consumption and sanitation, low temperature floor radiate heating system has been favored and been used in most heating areas since it was introduced into china in mid 80’s,But it is generally believed that floor heating system alone can not meet heating design requirement for large room located in cold area and is only deemed as an assistant heating methods.This article has proved by monitoring data collected from low temperature floor radiate heating system designed for large room in cold area that it is well enough to apply low temperature floor radiate heating system alone with reasonable design and running control and modification of heat exchanger.
Scale Effect of Vibration Mode of Micro-Beam in MEMS under Electrostatic-Mechanical Coupling
Authors: Chen Mei Qin , Su Ji Long
Published: November 2010

In order to determine and actively design the vibration characteristics of micro-cantilever in the MEMS devices, it is highly necessary to research on the modal analysis of micro-cantilever which is driven by electrostatic force. This paper analyzes the coupling of mechanical and electrical coupling beam based on the direct coupling method, applies ANSYS software into creating the model of the micro-cantilever to simulation of electromechanical coupling, and establishes the quantitative impact analysis model between natural frequency of vibration and the thickness of a micro-beam with Trans126 transducer element, through directly embedding intrinsic characteristic length of micro-cantilever beam to the scale effect of vibration mode. The main conclusion is that when the thickness of micro-beam is close to the characteristics size of the materials, the natural frequency will show a significant scale effect phenomenon.
Anisotropic Behavior of Geomaterial under Three-Dimensional Stress States
Authors: Zhang Kun Yong , Zhang Yan Gang , Wang Chi
Published: November 2010

Most soil constitutive models were developed based on the traditional triaxial tests with isotropic assumption, in which the load is applied as the major principal stress direction and the other two principal stresses are symmetric. When such isotropic models are applied to practical analysis, stress induced anisotropy under complex stress state and the middle principal stress effects are often neglected, thus there are many disagreements between the calculated results and the infield testing data. To simulate the practical loading process, true triaxial tests were carried out on geomaterial under three-dimensional stress state. It was found that the stress induced anisotropy effects are remarkable and the middle principal stress effects are obvious because of the initial three-dimensional stress state. Such kind of stress-induced anisotropy could have important impact on the numerical analysis results and should be taken into consideration when developing the constitutive model.
Frequency-Sensitive Optical Response via Tunable Band Structure in an EIT-Based Layered Medium
Authors: Liau Teh Chau , Wu Jin Jei , Shen Jian Qi , Yang Tzong Jer
Published: November 2010

The optical response of an atomic vapor can be controlled by using tunable quantum interference induced by external control field. A periodic layered medium whose unit cells consist of dielectric (e.g., GaAs) and EIT (electromagnetically induced transparency) atomic vapor is suggested. It is demonstrated that such an EIT-based periodic layered medium shows more flexible optical response (sensitive to frequency) than a conventional photonic crystal does. The controllable band structure that depends on the external control field can be applicable to designs of new devices such as photonic switches and photonic logic gates, where one laser field can be controlled by the other one, and would have potential applications in the field of integrated optical circuits and other related areas, e.g., the all-optical technique.
Si Ion Implantation-Induced Defect Photoluminescence in Silica Films
Authors: Zhao Yong , Hou Shuo , Liang Xiao Jun , Fang Li Guang , Sheng Guang Hu , Xu Fei
Published: November 2010

Dry and wet oxidation silica films doped with silicon ions were prepared using metal vapor vacuum arc (MEVVA) ion source implanter. The does of Si ion beams were kept constant at 3×1016 /cm2 and the energy varied from 42KeV to 70KeV. Five photoluminescence (PL) bands at the wavelength of 560nm, 580nm, 620nm, 650nm and 730nm have been observed at room temperature in all samples. The results of XRD showed none of Si nanocrystals were formed in the as-implanted silica films and originations of the PL bands were defects introduced by implantation. The 560nm PL band originated from oxygen surplus defect small peroxy radical (SPR), whereas the PL bands which ranges from the wavelength of 620nm to 730nm were attributed to non bridge oxygen hole center (NBOHC). Elevating implantation energy resulted in intensity increasing of 560nm PL band of dry oxidation samples but had inverse effects on wet oxidation samples. Influence mechanism of implantation energy on the defect photoluminescence was discussed in this article.
On the Nonlinear Viscoelastic Behaviour of the PVC-Coated Fabric
Authors: Zhang Wu Lian , Ding Xin , Yang Xu Dong
Published: November 2010

The nonlinear viscoelastic response of a PVC-Coated Fabric has been studied. For the needs of the present study, creep and recovery tests in tension of both the warp and the weft directions at the different stress levels were executed while measurements were made of the creep and recovery strain response of the system. For the description of the viscoelastic behaviour of the material, Schapery’s nonlinear viscoelastic model was used. For the description of the nonlinear viscoelastic response and the determination of the nonlinear parameters, a method by using a combination of analytical formulations and numerical procedures based on a modified version of Schapery’s constitutive relationship where an instantaneous plastic and a transient plastic terms were added, has been developed. The method has been successfully applied to the current tests.
Design of Automatic End-Advanced Hydraulic Support in Coal Face with Deep Dip Angle and Large Mining Height
Authors: Ma Li Qiang , Zhang Dong Sheng , Zhang Cheng Guo , Cao Xin Qi , Li Yong Shen
Published: November 2010

ZTZL60000/25/45 Automatic End-Advanced Hydraulic Support is developed to meet the needs of the fully mechanized coal face with deep dip angle and large mining height, mechanizing the advanced support of the end and drift, while greatly reducing the construction personnel's labor intensity. Not only the end support strength is enhanced, which improves the safety and reliability of advanced support and generates methods to solve problems related to reserving triangle coal on the face that enhances the support efficiency and reduces support costs, but also more recovered coal resources become available since the height of roadway increases, spawning a certain amount of economic benefits.
Environmental Benefits and Energy Efficiency of Superheated Steam as Media in Processing Ultra-Fine Fly Ash Technology
Authors: Xu Hai Lun , Li Zi Lin
Published: November 2010

With superheated steam from thermal power plants for medium, the fluidized bed jet mill which had improved vertical turbine classifier was used to study Superheated steam as media in processing ultra-fine fly ash technology. Experiment tested the energy consumption of processing fly ash with superheated steam, which was converted into standard coal compared with the air jet mill technology to prove the environment and energy saving advantages in superheated steam-gas processing ultra-fine fly ash. Experimental results showed that this technology has low energy consumption, high grinding force, and its grinding, grading, collection process is completely in dry method, so this technology is an ideal method for processing ultra-fine fly ash by low-cost and large-scale. At the same time, this paper assessed the environmental benefits of some environmental indicators. Finally, the applications of this technology are summarized.
Effect of Wheel/Rail Friction on Rolling Contact Fatigue
Authors: Wang Jian Xi , Xiao Wei , Zhang Xiao Dong
Published: November 2010

A numerical model is presented to analyze effect of wheel/rail friction on rolling contact fatigue. A three-dimension finite element model of rail is built up to investigate the rail stresses and strain around wheel/rail patch. Then, based on the critical plane concept, a new model was proposed to predict the rolling contact fatigue (RCF) crack initiation life under different wheel/rail frictions by using stress and strain on the critical plane as fatigue parameter. The numerical results obtained show that the wheel/rail friction coefficient has a great impact on the fatigue crack initiation life.and the curve of fatigue crack initiation life under different wheel/rail friction coefficient is roughly "S" type. The results are very useful in the wheel/rail friction management and determining grinding interval and grinding removal.
Failure Modes of Dual Phase Steels under Different Loading Paths
Authors: Xu Nan Qiao , Li Mei , Zhao Yi Xi , Hu Xing
Published: November 2010

In this paper, experimental and numerical analysis is used to investigate the failure modes of dual phase steels under different loading paths. Numerical models are established for uniaxial tensile tests and stretch flanging tests. Special attention has been paid to the behavior of DP780 in stretch flanging tests with small die radius. The occurrence of shear fracture is identified by comparing numerical simulation results with test data. The study suggests that traditional theory of localized necking is feasible for DP780 under uniaxial tensile condition but invalid when it is undergoing stretch flanging tests with small radius.
Research on Bearing Capacity of Prestressed Concrete T-Beam at High Temperature in Fire
Authors: Ai Hui , Zhang Chuan Qing , Zhang Li , Tian Ju
Published: November 2010

The bearing capacity of bridge structure would decrease under high temperature in fire, and there is a risk of structural collapse when the bearing capacity decreased to a certain degree. The estimate of bearing capacity of concrete structure at high temperature in fire will directly influence the scheme of disaster relief. Recently, there are a few researches on evaluating the bearing capacity of concrete structure at high temperature in fire, even fewer on bearing capacity of prestressed structure. Surface temperature and temperature of internal specific position of prestressed concrete T-beam are put forward in this paper by making use of ISO 834 international standard heating curve and distribution rules of temperature field of ASCE. The degradation of mechanical properties of concrete, steel bar, steel strand and other materials at high temperature are worked out according to relationships between material mechanical properties and high temperature, and on this basis, the bearing capacity of 3 prestressed concrete T-beams are calculated and evaluated at high temperature in fire. The results show that after being under 3-hour's high temperature in fire, the bearing capacity in high temperature of prestressed concrete T-beam would decreased to it’s 25% in normal; the stronger the concrete is or the thinner the concrete cover is, the greater decrease of bearing capacity of prestressed concrete T-beam would be. Based on calculations and evaluations, a statistics regression equation of bearing capacity of prestressed concrete T-beam at high temperature in fire is obtained.
Characteristics of In-Flight Particles and Splats Thermally Sprayed by Using Conventional and Nano-Composite Cored Wires
Authors: Tuiprae Man , Wirojanupatump Sittichai , Jiansirisomboon Sukanda
Published: November 2010

Characteristics of in flight particle and splat fabricated by arc spraying of three different types of cored-wire including WC-Cr-Ni, WC-Cr-Fe and W-Cr-Fe nano-composite were revealed. In-flight particles and splats were deeply characterized in order to correlate their characteristics that forming coating and affecting coating structure and properties. Starting cored-wires were also characterized prior to being sprayed. Particle size, morphology microstructure, chemical composition and phase identification were investigated through various techniques. The results showed that the size of the in-flight particle did not depend mainly on the size of filler particles as expected, but was instead strongly related to the whole content of metallic phase composed the cored-wire, as the more metal composition the larger size of the in-flight obtained. Splat shapes and characteristics were also found to depend on the metal content; a flower shape splat with a high degree of splashing was predominant for cored-wire having more metal composition. The W-Cr-Fe nano-composite cored wire had the highest content of metallic binder phase, which resulted in the largest in-flight particles produced, and well melted of the metallic phase led to the highest degree of splashing observed.
Influence of the Cell Wall Thickness of Core on the Dynamic Response of Square Honeycomb Sandwich Plate Subjected to Blast Loading
Authors: Wang Tao , Yu Wen Li , Dong San Qiang , Gao Yun Liang
Published: November 2010

In foregoing study, a new phenomenon of the local dent of upper face sheet occurs in the simulation of dynamic response of sandwich plate subjected to blast loading. The reason and the effect of local dent on energy absorption are not ascertained. In this paper, two kind of square honeycomb plate with the cell wall thickness of 1mm and 0.5mm and with the same mass are modeled. And the dynamic response of both plates subjected to blast loading is simulated using LS-DYNA. For the thicker cell wall (1mm), the local dent is obvious while for the thinner cell wall (0.5mm), the local dent is not obvious and can be ignored. In addition, curves of the ratio of the maximum deflection of lower face sheet of sandwich plate to monolithic solid plate vs the mass of TNT charge as well as the ratio of internal energy are obtained. The results indicate that the local dent has the contribution to the energy absorption of sandwich plate especially in early time and the sandwich plate with the core of thinner cell wall has more effective capacity in blast-resistance than that with the core of thicker cell wall.
Experimental Investigation on Compressive Properties for 3D Four-Directional Braided Composites
Authors: Wang Bao Lai , Wang Zhen Qing , Fang Guo Dong , Liang Jun , Zhou Li Min
Published: November 2010

Based on changing the braid angle and geometrical sizes, the compressive experiment of 3D braided four-directional Carbon/Epoxy braided composites is researched. It is found that failure of the braided composites exhibits compressive and shear failure mode. The failure crack propagates mainly in one or two 45º shear direction. Epoxy matrix among braid yarns of the braided composites is squeezed out to form epoxy band. The stress-strain relations of the braided composites with 45º and 30º braid angles all appear nonlinear apparently. Meanwhile the correlation of failure modes and constitutive relation with geometrical sizes of the braided composites is obtained. The compressive stress-strain relations of the braided composites are not great affected by the geometrical sizes. The compressive strengths with great discrete behaviors do not have obvious rules with height of the braided composites.
Research on Health Monitor for Three-Dimensional Braided Composite Material Products Condition Based on FBG
Authors: Li Yi , Wan Zhen Kai , Li Jia Lu
Published: November 2010

This paper describes the method of Fiber Bragg Grating(FBG)embedded in the three-dimensional(3D) braded composite materials and provides the method of health monitor for 3D braided composite materials condition. The paper analyses the relations of FBG change and the inner straining under the stretching on materials. It is provided that the way of signal collection and processing. In the process of load-supporting, the internal local strain of 3D braided composites is much more, and local strain has certain interference on embedded near FBG output. The experimental results proved that FBG sensors have exceptional sense characteristic. The braided angle of composites has a little influence on FBG signal. FBG embedded in the 3D braided composite materials has not more effect mechanical property of materials. This research provides basis for the study and application of advanced intelligent composites.
Influence of ZrO2 on Oxidation Resistant Properties of Glass-Based Coating on Molybdenum Substrate
Authors: Wang Qing Wei , Wang Hong Zhi , Ning Wei
Published: November 2010

the oxidation resistance of glass-based coating on molybdenum substrate was studied in the paper. The Mo substrates with glass based coating modified by the different concentration of ZrO2 in the coating were prepared and characterized; results showed the oxidation resistance of samples increased firstly and decreased subsequently with increase in ZrO2 concentrations. The influence of different heat treatment temperature was also discussed in the paper. After the sampes were pretreated at the high temperature for 20 minutes, the oxidation resistance properties were improved five times than un-pretreated ones. SEM showed the glass powders in the coating changed into viscous liquid which adhere to the substrate tightly after the samples had been pretreated. Resulting showed the sample exhibited the best oxidation resistance when pretreated at 1300°C.
Properties of Mullite-Zirconia Composites Prepared through Reaction Sintering Kaolin, α-Al2O3, and ZrO2
Authors: Sahnoune F. , Saheb N. , Goeuriot P.
Published: November 2010

Mullite–zirconia composites were synthesized through reaction sintering Algerian kaolin, α-Al2O3, and ZrO2. Phases present and their transformations were characterized using x-ray diffraction. Quantitative phase analysis was performed following the Rietveld method. Hardness and fracture toughness were measured by Vickers indentation. The flexural strength was measured using a Universal Testing Machine. It was found that the microstructure of samples sintered for 2 hours at 1600°C was composed of mullite grains which have whiskers’ shape and ZrO2 particles. In the composite containing 16 wt.% ZrO2, the ratio of tetragonal zirconia transformed to monoclinic zirconia was relatively small and did not exceed 18%. However, in the composite containing 32 wt.% ZrO2 around 75% of the tetragonal structure changed to monoclinic structure. Also, it was found that the increase of ZrO2 content from 0 to 32 wt.% decreased the microhardness of the composites from 14 to 10.8 GPa. However, the increase of ZrO2 content from 0 to 24wt.% increased the flexural strength of the composites from 142 to 390 MPa then decreased it with further increase of ZrO2 content. The fracture toughness increased from 1.8 to 2.9 MPa.m1/2 with the increase of ZrO2 content from 0 to 32 wt.%; and the rate of the increase decreased at higher fractions of ZrO2 content. The average linear coefficient of thermal expansion (within the range 50 to 1450°C) for samples containing 0 and 16 wt.% ZrO2 sintered at 1600°C for 2 hours was 4.7 x10-6 K-1 and 5.2 x 10-6 K-1 respectively.
Research on Effects of Mo Element on the Magnetic Properties of 1J79 Alloy
Authors: Cao Jing , Wang Yong Feng , Wei Chun Xue
Published: November 2010

1J79 alloy was prepared by vacuum electric arc smelting．The crystal growth and the content of impurity was observed by electron probe microanalyzer，and magnetic properties were measured by vibrating sample magnetometer(VSM)．Experimental results show that inclusions in the alloy are fewer and fewer, composition becomes more uniform with the increases of the Mo content, and grain size also becomes larger and larger with the increases of Mo content, to reduce coercivity. The small amount of Mo addition is useful to improve the saturation magnetization and reduce coercivity．
Research on the Behaviors of the Adsorption of Sulfate Ions onto Cross-Linked Chitosan in Wastewater
Authors: Guo Ying Juan , Xue Juan Qin , Bi Qiang , Li Jing Xian , Mao Wei Bo
Published: November 2010

Formaldehyde cross-linked chitosan was used to adsorb sulfate ions from aqueous solution in this study. Batch experiments were conducted to investigate the conditions of the adsorption, the isotherms and kinetics of the adsorption. The optimized conditions of adsorption were as follows: the adsorbent dosage was 0.5g, the equilibrium time was 240min, the initial concentration of sulfate ions was 153.3mg/L, the temperature was 50°Cand the value of pH was 2.2. The maximum adsorption capacity came up to 14.7 mg/g with the adsorption efficiency got to 95.7%. The equilibrium data fitted Langmuir isothermal model well. In addition, the adsorption process could be explained by the second-order kinetic model, and the chemisorption was the limit step for adsorption velocity.
Numerical Simulation of Welding for Vice-Frame Components
Authors: Luo Zheng Zhi , Pan Yi Su
Published: November 2010

In this article the application possibilities of welding simulation for vice-frame components are discussed. A three dimensional finite element model has been developed to dynamically simulate the welding process. The investigations focus on the simulation of the model construction and the welding effect on distortions and its stress. Comparisons of experimental and numerical results show good agreement and that the simulation method is reasonable. The vice-frame is a casting component that comes from a goods wagon bogie. So the procedure of the vice-frame simulation can be used for more complex structures like the side-wall, front-wall, roof, floor plate, and so on. It can help that optimize the welding process and improve the welding quality.
Thermoluminescence Spectra of Lithium Tetraborate Single Crystal
Authors: Xiong Zheng Ye , Ding Ping , Tang Qiang , Chen Jing Min , Shi Wen Qing
Published: November 2010

Lithium tetraborate (LBO or LTO) single crystal seems to be a promising new material for thermoluminescent dosimeter (TLD) and SAW resonators. In the present work, thermoluminescence (TL) characteristic and TL spectra of LTO single crystal grown by Bridgman method were measured, the kinetic parameters of TL traps were calculated, and TL spectra were analyzed. The result shows: The primary glow peaks are at about 186oC and 313oC. The activation energies of the traps corresponding to the two TL peaks are 0.96eV and 1.56eV, and the frequency factors are about 7.94×109s-1 and 6.31×1012s-1. The TL spectra of LTO crystal extends from 350nm to 460nm, and has its maximum at about 381nm. The intrinsic luminescent centers can send the energy from crystal lattice to Cu+ ions, because the activation energies of two are quite similar, and the Cu+ ions become new luminescent centers to increase TL sensitivity when Cu ions are doped into LTO crystals.
Study of Deformation and Breakage Characters in Coal Seam Floor under the Condition of Mining
Authors: Wang Zhong Chang
Published: November 2010

The water bursting disaster from the floor of mine is a complicated program involving several of subjects such as geology, coal mining, rock hydraulics and rock crack mechanics. In the paper, the two dimensional non-linear solid-fluid coupling model is used to study the difference of the water-holding capacity of the different floor combination under the condition of mining. The mini damage rock layer combination is obtained by analyzing the failure extent of floor under the mining pressure and water pressure. The water resisting capacity of the combination of b is the worst. The water resisting capacity of the combination of c is the best.
The Development and Summer Test of a New Ceiling Radiant Cooling Panel
Authors: Ma Li , Wei Dai Xiao
Published: November 2010

The main application problems of radiant panel in summer include lower cooling capacity owing to high temperature of water supply and condensation. A new radiant panel was developed. Water duct and panel are straight forming which eliminates the thermal contact resistance .The panel are installed in an angle in order to discharge condensate water. The guiding gutter in the face of panel and condensate pipe are to collect and outlet condensate water. The summer test was done. The results show that the new radiant panel has higher cooling efficiency compare with conventional panel .The cooling efficiency is above 1000w/m2, and condensate water can be discharged quickly. Although new Ceiling Radiant Cooling Panel is still not perfect, but it is provides us with more choice.
Numerical Simulation of Campus Wind Environment
Authors: Liu Ri Chao , Tang Zhong Hua , Qi Wei Yang
Published: November 2010

This paper adopted computational fluid dynamics (CFD) method, used k-ε RNG turbulence model-closed control differential equations for numerical simulation. Through numerical simulation and analysis of wind environment in a middle school campus, the round wind field under dominant wind direction was got in the summer and winter. According to the results of velocity field and pressure field, analysis the wind environment, compared the influence of wind direction and surrounding buildings space to the natural ventilation, provided guidance introduce for the layout of the school.