bluuebunny/crossref_metadata_2025 huggingface dataset:
Theoretical Study of the Effect of Ca Doping on the Electronic Properties of LiCoO2
Authors: Sun Zhen Hui , Liu Wei Hua , Wan Qi Xin , Li Dong Mei , Xiong Zhi Hua
Published: December 2011

Based on the first-principle calculations, we present a study of the effect of Ca doping on the electronic properties of LiCoO2. Studies of band structure and densities of states show that hole states, which enhance the conductivity of semiconductor appear in the valence bands of Ca-doped material due to the increase of Co4+concentration. It is further found that the Ca doping concentration should be controlled within 10 mol% of LiCoO2to keep the crystalline structure unchanged. We expect this study might be helpful for synthesizing good conductivity LiCoO2by controlling Ca doping.
Preparation of Cationic Rice Husk Flocculant and its Flocculating Characteristics
Authors: Fu Ying Huan , Lin Cheng Lin , Chen Li Feng , Song Yu , Ma Hong Chao
Published: December 2011

Natural polymer cationic flocculant was prepared by introducing quaternary ammonium group into the rice husk molecules, using potassium permanganate as initiator. The influence of synthetic conditions affecting flocculation was studied, such as reaction temperature, reaction time, dosage of initiator, concentration of sulfuric acid and material ratio. The flocculent experiment of diatomite was chosen to evaluate the capability of flocculant. The results show that the flocculant has good flocculent capacity, the removal of turbidity can reach above 90% for simulated wastewater under the optimistic conditions of synthetic process as follows: etherification temperature, 50°C; etherification time, 3h; initiator concentration, 3 mmol/L; sulfuric acid concentration, 1.8 mmol/L; ratio of rice husk to OTAC, 2: 3.
Microstructure and Wear Properties of In Situ TiC-Cr7C3/Fe Surface Composite
Authors: Wang Jing , Fu Si Jing , Ding Yi Chao , Wang Yi San
Published: December 2011

A wear resistant TiC-Cr7C3/Fe surface composite was produced by cast technique and in-situ synthesis technique. The microstructure and dry-sliding wear behavior of the surface composite was investigated using scanning electron microscope(SEM), X-ray diffraction(XRD) and MM-200 wear test machine. The results show that the surface composite consists of TiC and Cr7C3as the reinforcing phase, α-Fe and γ-Fe as the matrix. The surface composite has excellent wear-resistance under dry-sliding wear test condition with heavy loads.
Capillary Adsorption of Nanostructure Carbonic Materials for Nitrobenzene in Wastewater
Authors: Sun Yu Feng , Zhang Ai Min , Peng Bing Cheng , Liu Zong Tang , Fei Zheng Hao , Wang Jing Ping , Jiao Chang Mei
Published: December 2011

The aims of this work were to make use of carbonic materials to remove nitrobenzene in wastewater and investigate adsorption mechanism. The adsorption ability of different carbonic materials for nitrobenzene was compared. It was found that carbon nanotubes and carbon black exhibited higher adsorptive capacity than coconut activated carbon and granular activated carbon at the same experimental conditions. The specific surface areas and pore distribution was obtained by low-temperature nitrogen adsorption-desorption. We concluded that the capillary condensation in mesopores played an important role in the adsorption process owing to special nanostructure of carbon nanotubes and carbon black.
A New Interwell Tracer Technology - Particle Tracer Technology
Authors: Liu Yi Fei , Fang Xiao Dan
Published: December 2011

Fracture is the main factor to control seepage of fractured low permeability reservoir, which is more and more respected in the oilfield development. It will be one of the key factors in fractured low permeability reservoir that recognizes and describes correctly the geometric dimension and direction of the fracture. The article was done in the paper through the principle and characteristics of the particle tracer technology, analyzes the screening condition, introduces the injecting technology, monitors in the locale and creates an analytic method of particle tracer. The technology will provide a new method to determine the geometry and direction of the fracture of fractured low permeability reservoir, and will offer new approach to oilfield dynamic description.
The Transdermal Absorption Study of Human-Like Collagen
Authors: Chang Le , Fan Dai Di , Duan Zhi Guang , Jia Li Ping , Zhu Chen Hui , Ma Xiao Xuan , Luo Ya Ne , Hui Jun Feng
Published: December 2011

This paper focuses on the properties of the transdermal absorption of Human-like collagen (HLC). In present study, fluorescent marker (isothiocyanates were fluorescent element) was used to detect the absorptivity of HLC and gelatin was considered as a control. 2% HLC solution, 2% gelatin solution, a mixture of 2% HLC and azone, a mixture of 2% gelatin and azone were prepared, respectively. And then this solution was smeared on skin of mice. After 4h and 8h, the skin were collected and observed under a fluorescence microscope. In conclusion, pure human-like collagen has certain transdermal absorption and azone promote the transdermal absorption property of Human like collagen in comparison with gelatin.
Eco-Material Applied on the Interior Wall Decoration
Authors: Liu Yue Qing , Hu Wei Ping
Published: December 2011

This article is trying to point out the importance of eco-material, from the trait of common eco-material on the interior wall, as well as the comparison between the eco-material and the traditional material, to highlight the advantages of eco-material and call for more attentions.
Synthesis and Characterization of Polyimides Derived from 5-Amino-2(p-aminophenyl) Benzoxazole Monomer
Authors: Meng Xiang Li , Wang Peng , Jiang Ling
Published: December 2011

Polyimides prepared from 5-amino-2(p-aminophenyl) benzoxazole (AAPB) with pyromellitic dianhydride(PMDA), 2,2’3,3’-biphenyl tetracarboxylic dianhydride(i-BPDA), 4,4’-oxdiphthalic anhydride(ODPA), 1,4-bis(3,4-dicarbosyphenoxy) benzene dianhydride(HQDPA) and 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) were synthesized successfully via a conventional two-stage method. Their structures and properties were characterized by FT-IR, DSC, TG and XRD. The intermediate poly(amic acid)s had inherent viscosity range of 0.86~2.18 dL/g and could be thermally converted into light yellow polyimide films. The polyimides showed excellent solvent resistance and good thermal stability. The glass transition temperatures (Tg) were found to be 336oC~369 oC .The decomposition started at a temperature above 530oC in N2 atmosphere.
Preparation and Characterization of Silk Fibroin/Hydroxyapatite Bilayer Scaffolds
Authors: Liu Jian Bing , Tang Qiang , Lu Shen Zhou , Zhang Ceng , Li Ming Zhong
Published: December 2011

When the articular cartilage defect accompanies with the subchondral bone defect, using bilayer scaffolds which can integrate with surrounding host cartilage and bone tissue respectively as the tissue engineering scaffolds will be conducive to the repair of tissue defects. This paper reports a new method for preparing bilayer scaffolds. Firstly, hydroxyapatite (HA)/silk fibroin(SF) composite porous materials which have high porosity were prepared by a isostatic compaction molding method, then it was fully immersed in silk fibroin solution, and finally SF/HA bilayer scaffolds were obtained by freeze-drying. The structure of the bilayer scaffolds were investigated through scanning electron microscopy, X-ray diffraction, Fourier transform-infrared spectroscopy, electron excitation spectroscopy and electron microprobe. The results indicated that the upper layer of SF/HA bilayer scaffolds is porous SF component, the under layer is the porous HA/SF composite component and the interface of the two layer is closely connected. Furthermore, mesenchymal stem cells from mouse bone marrow were seeded into the bilayer scaffolds and the results showed that the cells had a well adhesion and growth after culturing for 3 days.
Microstructural Modifications in Electron Beam Irradiated Poly(ethylene terephthalate) Fibrics
Authors: Ding Chuan , Zhang Jian Chun , Liu Xue Qiang , Zhang Hua , Feng Xin Xing
Published: December 2011

Electron beam radiation effects of PET have been investigated. Microstructural changes in poly(ethylene terephthalate) subjected to electron beam irradiation at doses of 50kGy, 100kGy, 200kGy, 400kGy were investigated by Attenuated total reflectance infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD) , Atomic force microscopy (AFM) and scanning electron microscopy (SEM). Irradiated samples showed a increase of crystallinity with a minimum at 200kGy, which is attributed to secondary crystal and then an decrease at further doses due to some degradation effect. The chemical structure and surface topography has only a slight change with irradiation.
The Synthesis and Properties of 3-(2'-Benzothiazolyl)coumarin Fluorescent Dyes for Polyester Fabrics
Authors: Lin Shang Ming , Yao Dan Dan , Chu Zong Han , Fu Shao Hai
Published: December 2011

Fluorescent dyes based on 3-(2'-benzothiazolyl)coumarin were synthesized by a simple condensing reaction in this study. The chemical structures of synthesized compounds were subjected to FT-IR, 1H-NMR, Mass and UV/Vis analysis for color characteristics. Polyester fabrics dyed with the compounds were evaluated by color strength and color fastness to washing, perspiration and light of ISO. The results showed that all dyes decide after identified by IR, MS and 1H-NMR the structure is correct. And then all dyes were used to the dyeing of polyester fabrics. It was clearly that color strength increased with the increasing of the amount of carbon in the 7-position of coumarin ring. The level of color fastness to washing and perspiration were 4-5 or more, while the level of color fastness to light decreased with an increase of carbon chain length.
Long-Chain Organofunctional Silanes: Synthesis and Surface Derivatization
Authors: Pan You Lin , Arkles Barry , Eisenbraun Eric , Kaloyeros Alain
Published: December 2011

A series of organofunctional long-chain alkylfunctional silanes have been synthesized for the purpose of derivatization of micro- and nanoparticles and generation of molecular monolayers and films on the substrates. 11-bromoundecylsilane and 1, 10-disiladecane are evaluated to interact with a variety of clean hydrogenated metal and metalloid including titanium, silicon and silicon dioxide. The surface of those treated substrates has been analyzed by X-ray photoelectron spectroscopy (XPS) and reflection-absorption infrared spectroscopy (RAIRS). Our preliminary results indicate that self-assembled monolayer has been well formed on titanium metal and silicon wafer, minimally on silicon-dioxide. The discussion of experimental results is also provided.
The Influences of Annealing Temperatures on the Properties of the Sol-Gel Deposition SrBi4Ti4O15 Thin Films
Authors: Tzou Wen Cheng , Diao Chien Chen , Chan Chao Chin , Wu Chia Ching , Yang Chang Fu , Shiu Hung Chiuan
Published: December 2011

In this study, SrBi4Ti4O15 (SBT) thin films were deposited onto the SiO2/p-Si(100) and Pt/Ti/SiO2/p-Si(100) substrates by using sol-gel method. After deposition, the SBT thin films were then heated by a rapid thermal annealing (RTA) process conducted in air for 1min at 600-800°C. The surface morphologies and the crystalline structures of the SBT thin films were investigated by using SEM and XRD patterns. The grain sizes increased and the pores decreased with rising RTA temperature. In addition, the coercive field decreased and the remanent polarization and saturation polarization increased with rising RTA temperature. The lnJ-E1/2 curves of the SBT thin films were also investigated to find the leakage current mechanisms correspond either to the Schottky emission or to the Poole-Frenkel emission.
Effect of Vitreous Fluid Temperature on Fiber Diameter and Surface Topography of Glass Wool by Centrifugal-Spinneret-Blow Process
Authors: Li Bin Bin , Chen Zhao Feng , Chen Zhou , Qiu Jin Lian , Zhou Yan Qing , Zhou Jie Ming
Published: December 2011

In this paper, glass wools were prepared under different vitreous fluid temperature (vary from 1100oC to 1300oC) by centrifugal-spinneret-blow process. The effect of vitreous fluid temperature on fiber diameter and surface topography of glass wool has been studied by Scanning Electron Microscopy and Vertical Optical Microscope. With the increase of vitreous fluid temperature (T) from 1100oC to 1250oC, the mean fiber diameter decreased from 6.6µm to 3.9µm. When vitreous fluid temperature goes up to 1300oC, the mean fiber diameter increased to 4.1µm, slightly bigger than that of 1250oC. There are many protuberances in the fiber for T=1100oC and 1150oC because the surface tension is very strong at low temperature. The surface topography of fiber becomes smooth when the temperature is higher than 1200oC. The results show that the vitreous fluid temperature has a direct and pronounced effect on fiber diameter and surface topography. The optimum vitreous fluid temperature is about 1250oC.
Hysteresis Heat Build-up and Low Temperature Processing of Polymer under the Vibration Force Field
Authors: Zeng Guang Sheng , Xu Chao , Liu Yue Jun , Qu Jin Ping
Published: December 2011

By using dynamic capillary and multi-dimensional vibration experiment desktop, isotactic polypropylene ( iPP ) is selected for the objective material to investigate the effect of the vibration parameters on the viscoelastic properties of polymer and its molding process. And a series conclusions can be draw that: The phase angle of polymer tends to decrease after a increase with vibration frequency increasing. The phase angle reach maximum value of 90° when the vibration frequency equals to the material natural frequency. Which polymer experience as pure viscous materials, also hysteresis heat build-up rate goes up to the peak. The plasticizing rate of polymer increase as the vibration amplitude, but the higher requirement for the equipment leveled up as well. The polymer plasticizing rate display the same law with that of phase angle against vibration frequency. When the vibration frequency equals to the material natural frequency, the plasticizing rate reach maximum. The investigation of this study will offers valuable theoretical references for polymer processing and novel equipment design in low-temperature.
Effect of Packaging Materials and Process on the White LED Fabricated with Quantum Dots
Authors: Kwak Seong Kwon , Yoo Tae Wook , Kim Eun Hye , Kim Bo Sung , Lee Dong Wook , Lee Sang Mun , Park Lee Soon
Published: December 2011

In order to ensure long lifetime and stable light output of LEDs the thermal performance parameters need to be designed in the LED chip package and module level, which include such items as heat sink structure and materials, interface materials and substrates. In this work we used aluminium nitride(AlN) as submount of LED chips and made chip on board(COB) type LED module. The effect of different silver(Ag) epoxy bonding materials and bonding methods on the performance of LED module were examined. The effect of addition of red quantum dot(QD) on the performance of white LED was also studied.
Study on the Development of a Thin-Film Corrosion Sensor for the Monitoring of Cl Ion Penetration into Cementitious Materials
Authors: Lee Hyun Seok , Lee Han Seung , Joh Sung Hyung
Published: December 2011

Corrosion sensors were devised to develop a system whereby the depth of chloride permeation from concrete surfaces can be monitored in cover concrete of reinforced concrete structures. For making sensor which is similar to rebar author uses Screen printer machines, Ag paste and Fe powder. Appropriate portion of Ag and Fe is over 1:2. The resistance of sensors increased as the degree of corrosion increased.
A New Extensional Viscosity Model Based on the Cross Model for Polymer Fluids
Authors: Zhong Lei , Xu Hai Hang , Liang Ji Zhao , Liao An Ping
Published: December 2011

A new extensional viscosity model based on the Cross model is introduced. The proposed model can correctly describe the relation between extensional viscosity and extension rate. Effect of the four parameters in the new model is analyzed in detail. Compare the predictive curves to the measurement results reported in the references. It shows that the model calculation gives a good fit to the experiment data. This simple model has only a few parameters and is easy to use.
A Research on Static and Dynamic Fracture-Resistance of Welding Parts of Coolant Piping Material
Authors: Li Hao Chuang , Lee Kwang Hyeon , Koo Jae Mean , Seok Chang Sung
Published: December 2011

Tensile and fracture toughness tests of coolant piping materials were performed at various loading rates and temperatures. The crack measurement method for coolant piping materials consisted of the unloading compliance method for quasi-static loading conditions and condition, while the electric potential drop method and the normalization method for quasi-dynamic loading conditions. Tensile and fracture toughness tests of coolant piping materials were performed at the design temperatures of the primary piping system of nuclear power plants, which are 449K (176°C) and 589K (316°C). Also, the plastic η factor considering strength mismatch of welding part was applied to the fracture toughness test results and the J-R curves by the plastic η factor considering strength mismatch of welding part was compared with the J-R curves by the plastic η factor introduced in ASTM E1820-01.
Hyperelastic Model Selection of Tissue Mimicking Phantom Undergoing Large Deformation and Finite Element Modeling for Elastic and Hyperelastic Material Properties
Authors: Golbad Sara , Haghpanahi Mohammad
Published: December 2011

Pathologies in soft tissues are associated with changes in their elastic properties. Tumor tissues are usually stiffer than the fat tissues and other normal tissues and show the nonlinear behavior in large deformations. There have been a lot of researches about elastography (linear and nonlinear) as a new detecting technique based on mechanical behavior of tissue. In order to formulate the tissue’s nonlinear behavior, a strain energy function is required. For better estimation of nonlinear tissue parameters in elasticity imaging, non linear stress-strain curve of phantom is used. This work presents hyperelastic measurement results of tissue-mimicking phantom undergoing large deformation during uniaxial compression. For phantom samples, 8 hyperelastic models have been used. The results indicate that polynomial model with N=2 is the most accurate in terms of fitting experimental data. To compare the results between elastic and hyperelastic model, a 3-D finite element numerical model developed based on two different materials of elastic and hyperelastic material properties. The comparison confirm the approach of other recent studies about necessity of hyperelastic elastography and state that hyperelastic elastography should be used to formulate a technique for breast cancer diagnosis.
Analysis on the Influence Factors of Casing Collapse Resistance Strength
Authors: Lou Qi , Du Wei , Han Xin Li , Li Dong Feng , Zhang Guang Lu
Published: December 2011

Casing collapse resistance strength is an important parameter for its properties in using. Specification, geometry accuracy, material properties, and many other reasons can influence casing collapse resistance property. Study each factors influence for casing collapse resistance strength based on full scale collapse test results of seventeen Φ177.80mm casings and there geometry and material properties test results. The results show that casing collapse resistance strength was influenced by geometry accuracy, yield strength and residual stress together. Ovality greater than 0.5% and fluctuated more than 0.5%, or eccentricity more than 10%, casing collapse resistance strength will be reduced obviously. Casing with excellent collapse resistance strength will be produced through making yield strength in appropriate level, controlling the geometry accuracy and reducing residual stress.
Study on the Safety Assessment System of Fire Hazard in Coal Mine
Authors: Zhang Jia Yong , Gong Xue Min , Guo Li Wen
Published: December 2011

Fire hazard is one of the severe casualty accident, which injures the life-safety of the miner crucially and disturbs the sustained development of the coal mine. Recently the check-up table is the mere method applying for the assessment of the fire hazard, and the assessment conclusion is subjective intensively and the Index System of the Safety Assessment is not perfect, because the dangerous degree of fire hazard is set up by the professional. In this paper, the seven factors were generalized through the statistic and analysis of the 56 fire hazards, which included self-ignite gradation of coal bed, miner stuff, management of ventilation of coal pits, fire control system, safety administration, mine combustible, risk ratio of the electrical equipment. The ratio of each factor was confirmed by the method of layered analysis, the safety degree was set up through data processing and the proper measure and suggestion were put forward according to the safety result.
Study the Non-Linear Heat-Elasto-Plastic Constitutive Relation
Authors: Feng Xiao Jiu , Liang Li Fu , Wang Si Yuan
Published: December 2011

This paper adopts Macroscopic Phenomenological Method to establish constitutive relation. In order to maintain better approximation, it adopts testing data of typical stress path, testing data of uniaxial tension and torsion test. Applying multidimensional incremental theory under general loading law, on the base of certain loading function of stress space and loading function of strain space, this essay drives heat-elasto-plastic constitutive relation of heated isotropic hardening material under the condition of elasto-plastic decoupling. Meanwhile, this constitutive relation also suits for kinematic hardening material and elastic-perfectly plastic material. This paper builds a means of driving constitutive relation of multidimensional incremental theory under general loading law in strain space.
Failure Analysis of Automobile Redirector
Authors: Luo Yan , You Yi Liang , Zhang Zheng
Published: December 2011

The failure reasons of the valve shell from automobile redirector were investigated by metallography, fractography and mechanical property test. The result showed that continuous Si-phase with dentritic shape due to the improper solution-aged process and excessive Fe element remained due to the ineffective modification treatment were the main reasons of components’ brittle fracture.
Nonlinear Vibration of a Cantilever FGM Rectangular Plate with Piezoelectric Layers Based on Third-Order Plate Theory
Authors: Wang Ying , Hao Yu Xin , Wang Jian Hua
Published: December 2011

This paper deals with nonlinear dynamic analysis of a cantilever FGM rectangular plate with piezoelectric layers subjected to the transversal excitation in thermo-electro-mechanical environment. The material properties of plate and piezoelectric layers are assumed to be temperature-dependent. The governing equations of the functionally graded plate are based on the Reddy’s third-order shear deformation plate theory that includes thermo-piezoelectric effects and Hamilton’s principle. The governing nonlinear partial differential equations are transformed into ordinary nonlinear differential equations using the Galerkin method and the nonlinear and linear frequencies obtained using the Runge–Kutta method. The effects played by control voltage and system initial conditions on the nonlinear vibration of the plate are studied.
Application of Shape Memory Alloy Actuators to Control the Displacement of an Adaptive Beam
Authors: Liu Rong , He Ping , Feng Chang Shui
Published: December 2011

Shape memory alloy (SMA) wire actuators have broad application prospects in many fields. But due to the nonlinearity of inherent hysteresis of SMA, the precise position control system is difficult to be obtained to these kinds of actuators. Therefore, it is significant to research the control technology of SMA wire actuators to extend the application of SMA wire actuators. In the current paper, a shape memory alloy wire actuator is designed to control the displacement of an adaptive beam. The dynamic model of SMA wire actuator is derived based on Brinson’s model and two types of inputs are used to produce different displacements. Then, PID control strategy for the SMA actuators is established and implemented to active control the position. Also, real-time control (RTC) is applied to the SMA wire actuators, which can concurrently generate real-time codes and accelerate the process of simulation. Through the comparison of different amplitudes and frequencies of current inputs, the different control abilities and characteristics to acquire the maximal displacement can be approximately achieved. Significantly, the position can basically remain stable. The results demonstrate the SMA wire actuators can be used to stably control the displacement of the adaptive beam.
Experimental Investigation of Tensile Properties and Fracture Mechanism of WCP/Cu Composites Reinforced with Different WCP Volume Fraction
Authors: Yan Feng , Guo Rong Xin , Xia Hai Ting , Yu Hai , Zhang Yu Bo
Published: December 2011

The copper matrix composites reinforced by different WCP volume fraction were fabricated via Vacuum Hot-pressed Sintering technique. The tensile performance and fracture behavior of WCP/Cu composites were studied by uniaxial tension tests and the fracture surfaces were examined by SEM. The test results of mechanical properties show that the WCP/Cu composites exhibit obvious improvement of tensile property comparing with that of the matrix. The fracture surface morphology indicate a trend that the fracture of WCP/Cu composites changes from debonding to cleavage with the increase of the WCP volume fraction.
The Compaoparison of Characteristics of Fracture Toughness of Materials for Nuclear Piping by Use of Various Types of Specimens
Authors: Kwon Hui Hwan , Park Soo , Koo Jae Min , Seok Chang Sung
Published: December 2011

Since it is difficult to cut off large specimens from nuclear piping, generally the standard CT specimens of 1T are used to perform fracture toughness tests. However, when compared with the test result obtained from a real pipe, the results from CT specimens are been known to be very conservative. Therefore, the U.S. Nuclear Regulatory Commission recommends the use of specimens whose thickness is greater than or equal to the thickness of a real pipe for estimating the stability of crack resistance[1]. In this study, a series of fracture toughness tests were performed using various types of specimens: the standard CT, non-standard Compact Pipe, and Curved CT. The results of the tests were compared.
Fatigue Crack Propagation Simulation of Rubber Shock Absorbers
Authors: Zhai Jing Yu , Yang Ying , Han Qing Kai
Published: December 2011

Rubber shock absorbers are the key parts to isolate vibrations of the machinery and equipment. In this paper, a three dimensional finite element model of a rubber shock absorber is established; then the computation of three dimensional fatigue crack growth rates are discussed by using the nonlinear finite element method. The stress distribution which can determine the initial crack location and the possible risk surface under dynamic loads is obtained. The three dimensional crack growth is simulated by using finite element method and linear elastic fracture mechanics. A brittle fracture process of the rubber shock absorber along the dangerous surface is simulated by using the cohesive element of ABAQUS.
A Comparative Study of the Effect of Crosslink Agents and Chemical Modification on Properties of Natural Rubber Vulcanizates
Authors: Thitithammawong Anoma , Nakason Charoen , Kasoe Rusmawatee
Published: December 2011

The influence of crosslink agents on properties of modified-NRs was investigated. The results prove that the presence of oxirane rings and/or chlorine atoms on the ENR and CENR molecules prominently affects on overall studied properties of the vulcanized rubbers. Crosslink agents also play significant role on Mooney viscosity, curing and tensile properties of the vulcanized rubbers, however, they are less influence on dynamic mechanical and thermal properties.
Preparation and Performance Testing of Tubular Cathode Support for Direct Ethanol Fuel Cell
Authors: Zhang Yang , Tang Dong , Duan Rui Xue , Ni Hong Jun
Published: December 2011

A new tubular cathode support for Direct Ethanol Fuel Cell (DEFC) was prepared by the gelcasting process using mesocarbon microbead(MCMB) and graphite as the main raw materials. The effects of different graphite doping ratios on tensile strength, bending strength, crushing strength, volume resistivity and shrinkage rate for the prepared tubular cathode support were studied by experimental test. The result showed that the prepared tubular cathode support had very good comprehensive performance. The tubular cathode support with 10% graphite exhibits the best performance such as bending strength 25MPa and resistivity30µΩ•m, and it satisfied the DEFC cathode working conditions and performance requirements.
Particle Size, Structure and Powdering Process of Calcium Carbonate Nanoparticles Filled Powdered Styrene-Butadiene Rubber
Authors: Zhang Zhou Da , Chen Xue Mei , Qu Guo Liang
Published: December 2011

Calcium carbonate nanoparticles (nano-CaCO3) filled powdered styrene-butadiene rubber (P(SBR/CaCO3) was prepared by adding nano-CaCO3 particles, encapsulant and coagulant to styrene-butadiene rubber (SBR) latex by coacervation, and the particle size distribution, structure were studied. Scanning electron microscopy (SEM) was used to investigate the (P(SBR/CaCO3) particle structure, and a powdering model was proposed to describe the powdering process. The process includes: (i) the latex particles associated with the dispersed nano-CaCO3 particles (adsorption process) to form “new particles” and (ii) the formation of P(SBR/CaCO3) by coagulating “new particles”. The SEM results also shown that the nano-CaCO3 and rubber matrix have formed a macroscopic homogenization in the (P(SBR/CaCO3) particles and nano-CaCO3 dispersed uniformly in the rubber matrix with an average diameter of approximately 50 nm.
Effects of Melting Process on the Microstructure and Thermal Conductivity of Cu-10Ni-5Mo Alloy
Authors: Lu Bai Ping , Xu Hui , Liu Can Cheng
Published: December 2011

Cu-10Ni-5Mo alloys have been prepared by arc-melting and induction melting injection moulding. The effects of melting processes on the microstructure and thermal conductivity of Cu-10Ni-5Mo alloys were studied. The results show that the grain of Cu-10Ni-5Mo alloy prepared by arc-melting is coarse and the structure includes α solid solution and Mo-Ni phase. The grain of Cu-10Ni-5Mo alloy prepared by induction melting injection moulding is superfine and the structure is α solid solution. Under this experiment condition, the coefficient of thermal conductivity of Cu-10Ni-5Mo alloy prepared by arc-melting is 56.9 W/(m•K)，while that of Cu-10Ni-5Mo alloy prepared by induction melting injection moulding is 35.7 W/(m•K). The melting points of Cu-10Ni-5Mo alloy prepared by two methods all increase and are little different.
Friction and Wear Behavior of POM Composites Filled with LDPE and Wood Fibers
Authors: Xiang Xiao Han , Xiang Ding Han , Fang Wei , Ma Jiao Ling
Published: December 2011

Polyoxymethylene (POM) composites filled with low-density polyethylene (LDPE) and wood fibers were prepared by injection-molding. Friction and wear tests were carried out in a reciprocating sliding tribotester. Results showed that 5wt.%LDPE acted effectively as the internal lubricant for POM. Further addition of the wood fiber increased the wear rate of the POM/LDPE composites but had little effect on the coefficient of coefficient in the presence of LDPE. SEM observations showed that the main wear mechanism for unfilled POM was adhesive wear, while in the case of POM composites abrasion and fatigue seemed to govern the wear process. It was suggested that, the POM/LDPE/Wood fiber composite, which is low-cost and environmentally friendly, has the potential for tribological applications.
Study on Reliability of New Fixture Method for NOMEX Honeycomb
Authors: Jin Cheng Zhu
Published: December 2011

A new fixturing method, based on the principles of strong magnetic field and friction-clamping, is presented. The method can completely constrain the bottom of the NOMEX honeycomb with the friction force between iron powder and honeycomb walls, honeycomb and clamping plane produced from the gravity of the iron powder injected into the honeycomb and the magnetic force produced by the additional strong magnetic field. To analyze the reliability of the method, firstly, the milling force and its distribution are predicted with FEM and experiment method under the condition of different cutting parameters. Then, the fixturing strength and the milling force are analyzed comparatively in the low-reliability and -stability zone during the milling process. It is proved by experiments and analysis that the fixturing method has the advantages of low cost, being easy to use, and no pollution.
Study on the Absorption Properties of Spinel Type Ferrite Composite Coatings in the Low Frequency
Authors: Wang Wen Jie , Jiao Qing Jie , Zang Chong Guang , Zhu Xiang Dong
Published: December 2011

In the present study magneto-polymer composite coatings are fabricated using nano Zn ferrite, Mn ferrite, Ni ferrite, Zn-Mn ferrite and Zn-Ni ferrite by spraying method. The complex permeabilities, Complex permittivities and microwave absorbing properties within the low frequency of these composites were characterized and investigated. The results showed that the magnetism of the mixed spinel ferrites ( Mn ferrite, Zn-Ni ferrite, Zn-Mn ferrite) are strong but the dielectric properties are weaker, while the magnetism of the normal spinel ferrites (Zn ferrite) is the weakest but provide with a big storage capability of electric energy. The absorbing characteristics of the spinel ferrites are better at 300 kHz-1.5GHz, with minimum absorption of 12.5 dB and the maximum absorption at 480MHz, 1050 MHz and 1400 MHz. The microwave absorbing property of the mixed spinel ferrite Zn-Mn ferrite is best having the RL value being -42.5 dB at 1400GHz.
Development of Slab Caster Break-Out Alarm ANN System
Authors: Jin Yan , Ding Hui , Tian Zhi Bing
Published: December 2011

In this paper the Slab Caster Break-out Alarm ANN System is introduced, which has been developed with artificial intelligence and logic technique, knowledge of continuous casting expert system. The characteristics of the Slab Caster Break-out Alarm ANN System is that the breakout predict of the system is achieved with the logic breakout prediction module and BP neural network breakout module; The predicting results of the two methods are inputted into the expert system decision module, this module can provide the last predicting results. This would increase the prediction accuracy, and improve the process of slab continuous casting.
Morphology and Crystallization Behavior of Toughened Poly(trimethylene terephthalate) Blends with Maleated Styrene-Butylene-Co-Ethylene-Styrene Copolymers
Authors: Wang Kun Yan , Zhou Shi Yang , Xu Xu Qing , Cao Feng
Published: December 2011

The blends of poly(trimethylene terephthalate) (PTT) with maleated styrene-butylene-co-ethylene-styrene copolymer (SEBS-g-MA) were prepared by melt blending. Their morphologies and crystallization behavior were investigated. Morphology observation shows the well-dispersed phase of SEBS-g-MA in PTT matrix and the partical size of SEBS-g-MA increased as the content of SEBS-g-MA increasing. Differential scanning colorimetry(DSC) experiments showed that the melting point of pure PTT and their blends was almost constant. Addition of 5-30wt% SEBS-g-MA in blends increased crystallization points of PTT phase and the crystallinity of the blends were higher than that of PTT.
Influence of Matrix Aggregates Particle Size Grades on Properties of Grouting Material for Blast Furnace
Authors: Pei Xiu Juan , Wang Zhi Fa , Wang Rui Sheng
Published: December 2011

The characteristics of grouting material for blast furnace lining crack repair were briefly introduced in this paper. The influences of matrix aggregates particle size grades on the properties of grouting materials for blast furnace lining crack repair were mainly discussed. Based on series of tests and experiments, the optimized matrix aggregates particle size grades were confirmed.
One Simple Finite Element Methodology to Determine the Moduli of Hexagonal Honeycomb
Authors: Sun De Qiang
Published: December 2011

According to the related experimental standards, the finite element (FE) methodology to calculate the in-plane and out-of-plane moduli of hexagonal honeycombs (HHs) is designed by simulating the experimental loadings. Some simulations were carried out for the hexagonal honeycombs with different configuration parameters. The FE results are consistent with the theoretical ones, which verifies the reliability of FE methodology.
Mechanical Design and Virtual Teaching of a Two-Leg Walking Mechanism
Authors: Guo Hong Hong , Cheng Guang , Wang Shu Fang
Published: December 2011

This paper describes a basic method of mechanical design and virtual teaching of a two-leg walking mechanism, mainly including the assignment of the degree of freedom (DOF), the process of kinematics and Kinetics computing, the selection method of driving devices and the principle of the virtual teaching system. The fact proves that this two-leg walking mechanism is of high stability and efficient teaching.
Treatment of Printing and Dyeing Wastewater by the Iron Scurf and Flue Dust Internal Electrolysis Method
Authors: Yan Jin Xia , Li Dong Fang , Dong Shao Feng
Published: December 2011

The printing and dyeing wastewater was treated by internal electrolysis method. The results show the chromaticity removal rate was up to 98.53 percent and COD removal rate 85.98 percent under the optimum conditions of wastewater pH 4, reaction time 30 minutes, the electric conductivity 1450μm/cm, the value BOD5/COD increases from 0.34 to 0.51. Moreover, the pH, Fe2+ concentration and absorbance of wastewater changed in the process, the mechanism of that was also analyzed.
Research on Generalized Overall Shape Setting Control Models with Asymmetric Shape Control Function for UCM Mill
Authors: Wang Xiao Chen , Yang Quan , Liang Zhi Guo , He Fei
Published: December 2011

Towards the insufficiency of the research on asymmetric shape defects control, and the equipment of new asymmetric shape control device—inverse symmetric roll bending for UCM cold mill, in this paper, by ANSYS finite element simulation, high-precision rolls-strip coupling models were established, and the difference of control character among all the symmetric and asymmetric shape control methods were analyzed, then generalized overall shape setting control models with asymmetric shape control function was proposed. It was proved by field application that the control models can effectively control asymmetric and high-order shape defects with the coordination of all the symmetric and asymmetric shape control methods. Consequently, expansive research and apply prospect should be expected.
Green Synthesis of Silk Sericin-Based Silver Nanoparticles
Authors: Ding Jia Li , Wu Wen
Published: December 2011

Green synthesis of silver nanoparticles (AgNPs) using the silk sericin (SS) solution by in situ reduction at room temperature is reported. The effect of pH on the reduction reaction is studied by UV-Vis spectroscopy. The structure of the sericin-based silver nanoparticles is characterized by TEM. According to the TEM images, the average size of the silver nanoparticles is about 16 nm. The silver nanoparticles are highly dispersed and stable in silk sericin solution for monthes.
Study on the Magnetic Induction Effect of Rare-Earth La Modified Amorphous Ribbons
Authors: Jiang Da Guo , Yang Cao Bing , Zheng Guo Tai
Published: December 2011

Prepared rare-earth La modified amorphous ribbon by doping Rare-earth La in Fe78Si9B13amorphous alloy. Investigated rare-earth content and annealing temperature as well as their influence on the magnetic induction effect and its amplitude. The results show that, when magnetic field is less than 1356 A/m, with the increase of Rare-earth content,the magnetic induction effect first increased and then decreased, when the magnetic field strength greater than 1356 A/m, the Rare-earth content influence little on magnetic induction effect, changing amplitude of magnetic induction effect shows first increased and then decreased with increasing Rare-earth content.
Structure of Chromium Atomic Chains
Authors: Shen Han Xin , Zhu Wen Zhang , Li Ai Yu
Published: December 2011

The geometric and electronic structures of Cr chains are studied by the first-principles of density-functional method. The present calculation results show that chromium can form planar chains in linear, zigzag, dimer, and ladder form one-dimensional structures. The most stable geometry chain among the studied structures is the ladder-form chain with five nearest neighbors. The dimer structure is found to be more stable than the zigzag one. Further more, the relative structural stability, the electronic energy bands, the density of states is discussed based on the ab initio calculations.
Facile Synthesis of Ammonium Aluminum Carbonate Hydroxide Multilayered Nanofiber by Using Solid State Reaction
Authors: Hu Xiao Fu , Liu Yun Qi , Liu Chen Guang
Published: December 2011

In this paper, we make systematical investigation for the new synthesis pathway of AACH multilayered nanofiber, which has been prepared by a low-temperature solid-state reaction. The phase transformation sequence of AACH on heating is found that the precursor converts into γ-Al2O3at 700-900°C and elevated temperature results in the θ-Al2O3and α- Al2O3crystal phase formation at 1000°C. With a higher calcination temperature at 1100°C, α- Al2O3pattern appears. The specific surface area (SBET) of aluminum oxide specie calcined at 500°C for 4h is still in 420.2m2/g. Meanwhile, it suggests a partial change in particle sizes and morphology of sample calcined at 500°C for 4h.
Synthesis of SnO2 Nanoparticles with Varying Particle Sizes and Morphologies by Hydrothermal Method
Authors: Wang Dong Xin , Bao Xu Jin , Zhong Jing Ming , Sun Ben Shuang
Published: December 2011

Using ammonia solution and tin chloride as the precursors: tin oxide nanoparticles with different particle sizes and morphologies were synthesised by varying the concentration, heating temperature and ripening time via hydrothermal method. The particles synthesised were characterised by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The TEM micrographs show that rod-like nanoparticles were synthesised when the SnCl4 solution concentration was less than 1.0 mol/L, which was changed to oval shape when the concentration increased above 2.0 mol/L. Polygonal shaped nanoparticles were observed at 220 °C for 48 hours. It was also found that changing temperature had little effect on the morphology but great influence on the size of the particles, which increased from 10 nm to 120 nm from 160 °C to 220 °C and 12 nm to 55 nm from 6 h to 48 h at 200 °C, respectively. XRD patterns indicated that all of nanoparticles synthesised were tin oxide.
Optimal Design and Characteristic Analysis of a Special Type Gear Test Rig
Authors: Jin Xiang Yang , Wang He Teng , Zhang Li , Zhao Li Li , Guan Xiang Yi
Published: December 2011

In this article, the rationality to determine the mechanical design of the test rig for the beveloid gear with intersecting axes has been verified, and the overall performance of the test rig has been predicted. First, the three-dimensional solid models of all components have been established, and the virtual prototype simulation technology has been used for its kinematics simulation. Then, the static and dynamic performance of the key components has been analyzed. At last, the transfer matrix method has been used to analyze the torsional vibration mechanics of the closed gear test rig, so as to obtain the simulation curves of dynamic load factors of the test gear under different speeds. The results show that the whole test rig can be applied in the gear test with intersecting axes, without the auxiliary test gear pair, which has good gearing test accuracy. Besides, the test rig itself has low costs and good running economy.
Research on Nano Porous Cu Films Prepared by Sol-Gel Method
Authors: Zhang Hui Jun , Li Ming Yu , Zeng Qing Xuan , Feng Chang Gen
Published: December 2011

Nanocrystalline porous Cu films were prepared on glass subtrates by sol-gel spin coating technique with copper(II) acetate as raw material and NH(C2H2OH)2as chelating agent. The characteristics of films were analyzed by IR, TG-DTG, XRD and SEM. The structure of Cu films was remarkable influenced by sol concentration and PEG content. The effects of calcining temperature and the way of the gelation on grain size were discussed. The results showed that the pore size and density are homogeneous when the sol concentration was 0.6 mol/L and the PEG content was 0.35 g.
Synthesis and Characterization of Water-Soluble Monolayer-Protected Gold Nanoparticles
Authors: Su Yan , Lin Ying Yun , Fu Yu Li , Qian Fan , Yang Xiu Pei , Choi Martin M.F
Published: December 2011

Water-soluble gold nanoparticles (AuNPs) were prepared using 2-mercapto-4-methyl-5- thiazoleacetic acid (MMTA) as a stabilizing agent and sodium borohydride (NaBH4) as a reducing agent. The AuNPs product was analyzed by transmission electron microscopy (TEM), UV-vis absorption spectroscopy and Fourier transform infrared spectroscopy (FTIR). The TEM image shows that the particles were well-dispersed and their average particle size is about 5 nm. The UV-vis absorption and FTIR spectra confirm that the MMTA-AuNPs was stabilized by the carboxylate ions present on the surface of the AuNPs.
Rectifying Properties of La1-XSrXMnO3/Si (x=0.2, 0.04) PN Heterostructures
Authors: Li Tong , Zhang Yu , Ni Xiao Chang
Published: December 2011

La1-xSrxMnO3(x=0.2, 0.04)/Si PN heterostructures were prepared by RF magnetron sputtering method, which have evident rectifying properties. Furthermore, the excellent rectifying properties are presented in a relatively wide temperature range for La0.8Sr0.2MnO3/Si heterostructures. The diffusion voltage decreases with increasing the temperatures, which is attributed to the modulation of the interfacial electronic structure of the heterostructures.
Preparation of Carbon Nanofibers from Polyacrylonitrile Nanofibers by Electrospinning
Authors: Li En Zhong , Yang Da Xiang , Guo Wei Ling , Wang Hai Dou , Xu Bin Shi
Published: December 2011

Ultrafine fibers were electrospun from polyacrylonitrile (PAN)/N,N-dimethyl formamide (DMF) solution as a precursor of carbon nanofibers. The effects of solution concentration, applied voltage and flow rate on preparation and morphologies of electrospun PAN fibers were investigated. Morphologies of the green fibers, stabilized fibers and carbonized fibers were compared by scanning electron microscope (SEM). The diameter of PAN nanofibers is about 450nm and the distribution of diameter is well-proportioned. Characterization of the elements changes of fibers were performed by X-ray photoelectron spectroscopy (XPS).