bluuebunny/crossref_metadata_2025 huggingface dataset:
Method of Spling Weight and Residual Value for Analyzing Bending of Laminated Skew Plates under Complex Stress State
Authors: Shi Ping An
Published: July 2011

In order to meet the needs of boundary conditions and eliminate the residual of governing equations, the weighted residuals method is combined with least squares method solve the nonlinear bending problem of symmetrically angle-lay orthotropic laminated composite plate, and the double fifth B-spline is taken as trial function to seek an efficient method for large deflection of plate. The analytical solution of bending problems of symmetrically angle-lay orthotropic laminated composite plate with clamped boundary conditions is obtained by using the weighted residual method. The results from the present method are in good agreement with those derived from other methods, and the present method has the advantages of simple principle, high calculation efficiency and easy to satisfy boundary conditions as well, superiority to finite element method. In addition, the design of computer program is simple and it is easy to be programmed.
Robust Adaptive Control for Gun Control System of Tank
Authors: Cai Jian Ping , Ma Jun Er
Published: July 2011

In this note, a class of gun control system of tank is considered with all uncertainties, such as unknown constant parameters, unlinearly parts, unparameterized parts, unmodeled parts, unknown external disturbance and so on. An robust adaptive control law is designed with backstepping technique. Compared to exist results on tank gun control problem , our control scheme combine the robust control and the adaptive estimator of unknown constant parameters and can compensate all uncertainties Accurately. The stability of closed loop system and the tracking performance can be guaranteed by this control law. Simulation studies show that this controller is effective.
Production of Nanosilica from Iron Tailing and Characterization
Authors: Li Feng Feng , Zhang Ming Xi , Shen Yi , Jiao Du , Hou Gui Qin , Li Hong Sheng
Published: July 2011

Nanosilica was extracted from iron tailing by the chemical deposition method, involving pickling, filters washing, alkali dissolving of pickling dregs in high temperature, precipitating silica controlled by diluted acid and so on. The product has been studied by SEM, XRD, FT-IR, and thermal analysis techniques, etc. These study shows that the nanosilica is a kind of amorphous matter consists of hydrous silicon dioxide (97.076%) with small amount of sodium and aluminum trapped inside the Si–O network. The diameter of globular silica particles is 30-50 nm.
Study on the Compression Performance of CFRP Confined GFRP Short Column
Authors: Chen Li , Zhao Qi Lin , Song Jian Guo , Ding Yong
Published: July 2011

In order to restrain the lateral expansion and splitting of GFRP, and accordingly heighten its axial compressive bearing capacity, a project that to confine GFRP column with surrounding CFRP sheet is suggested in the present study. Experiment on the CFRP sheet confined GFRP column shows that a combined structure of high bearing capacity is attained. Basing on the experiment research a theoretical iterative calculation approach is suggested to predict the ultimate axial compressive stress of the combined structure, and the predicted results agree well with the experimental results. Then the influences of geometrical parameters on the ultimate axial compressive stress of the combined structure are also analyzed basing on this approach.
Study of the Sealing Characteristic of Polytetrafluoroethylene-Coated O-Ring Applied in Gas-Tight Deep-Sea Water Sampler
Authors: Huang Hao Cai , Ye Yan Ying , Yang Can Jun , Leng Jian Xing , Chen Ying
Published: July 2011

In ocean science research, it often requires the integrity of the gas content in samples of seawater. The gas-tight deep-sea water sampler (GTWS) based on pressure self-adaptive equalizer (PSAE) can satisfy the requirement very well. The PSAE is required to achieve a reliable dynamic sealing in deep sea. The general O-ring is difficult to meet this requirement. The polytetrafluoroethylene (PTFE)-coated O-ring is chosen as the sealing parts. The finite element analysis (FEA) software ANSYS is used to analyze the contact pressure of the PTFE-coated O-ring in different conditions, that is, analyze the GTWS’s gas tightness theoretically. Combine with the sea trial results, the feasibility and reliability of the PTFE-coated O-ring in deep-sea dynamic sealing in PSAE can be prove both in theory and practice.
The Influence of Si Content on the Microstructure of Rapidly Solidified AlMnSi Foil
Authors: Li Yan , Zhai Chuan Xin , Xu Chun Hua
Published: July 2011

The AlMn and AlMnSi foils were fabricated by rapid solidification technology. The microstructures of the foils with various Si content were studied by transmission electron microscope (TEM). The phases of the foils were indentified by X-ray diffractometer (XRD); the phase transformation temperatures of the foils measured by differential scanning calorimeter (DSC). The results showed that addition of Si in the AlMn foil can improve the heat stability (phase transformation temperature) from 543K to over 873K. The addition of Si can change the phase structure of the foils. The phases of AlMn foil conclude Al and Al6Mn while the phases of AlMnSi foils with 3% Si or 5% Si addition become Al and Al4.01MnSi0.74. The addition of Si can also change the microstructure morphology of the foils from the rod, block and petal-like to the homogeneous globular. With the increase in Si content, the grain sizes of the foils were refined.
Sintering Process of Mullite- Corundum Insulation Material with Nano Crystals
Authors: Yang Dao Yuan , Wu Juan , Wei Guang Hui , Zhu Kai , Yuan Hui Yu , Liu Jing Wei , Chong Bo
Published: July 2011

Mullite- corundum insulation material with nano crystals in matrix was fabricated by gel-casting process. The results showed that the volatilization temperature of organisms is 285°C- 600°C, there is no glass phase appeared in specimens; The mullitization begin at 1000°C, along with the raise of temperature, the quantity of mullite phase increases, especially during 1200°C- 1400°C; when the temperature is up to 1550°C, mullite becomes the main crystal phase and there are also some corundum crystals in the specimens; The specimen matrix sintered at 1550°C is consisted of nano crystals 80nm in length and 10-20nm in diameter.
The Oxidation of Co-5Al Alloys in 1 Atm of Pure O2 at 700 and 800 OC
Authors: Zhang Hong Hua , Xiang Jun Huai , Wang Wei , Shi Ya Juan
Published: July 2011

The oxidation of binary Co-5Al alloys in 1 atm of pure O2 at 700 and 800°C was investigated. Oxide scales generally showed good adherence to alloys during oxidation process, although scale spallation on cooling was observed inevitably due to difference in the thermal expansion coefficients between oxides and alloys. It indicated that oxidation of the two alloys approximately obeyed parabolic rate law (n=2). The parabolic rate constants as functions of temperature at 700 and 800°C were 8.38×10-11, 3.45×10-10 g2cm-4s-1, respectively. The binary Co-5Al alloys presented a non-protective oxidation behavior because the Al content was not enough to support the growth of a dense, stable Al2O3 layer. The scales were mainly composed of oxides of cobalt, coupled with a little Al2O3 present at the inner part of the scales.
Study on Microorganisms’ Immobilization by Different Support Materials in the UASB System
Authors: Lin Jian Qing , Fang Hong Da , Wu Jing Jing , Lin Lin Ting , Lin Jin Mei , Cheng Lin Jie
Published: July 2011

Four up-flow anaerobic sludge blanket reactors (UASB) filled with oyster shell (R1), activated carbon (R2), quartz sand (R3), zeolite (R4), respectively had been selected to inspect their effects on the COD removal efficiency, and to compare with the traditional UASB reactor (R0). System stability and pH variation were also inspected. All the reactors were inoculated with sludge from a local sewage treatment plant, and fed with the synthetic wastewater. The organic load rate was 0.96 kgCOD.m-3.d-1during 1-20 days (StageⅠ), 1.86 kgCOD.m-3.d-1during 21-57 days(StageⅡ), and 5.32 kgCOD.m-3.d-1during 58-97 days(StageⅢ), the system temperature was controlled at 35 °C. The influent pH was 7-8. The results reveal that: (1) The average removal rate was 94.5%, 78.0%, 91.4% for R1; 93.6%, 87.7%, 92.5% for R2in the three stages, respectively. R1and R2reactors are suitable to treat low organic load wastewater( 0.96 kgCOD.m-3.d-1) to high organic load wastewater(5.32 kgCOD.m-3.d-1). R3, R4and R0are not suitable for high organic load wastewater. (2) R1and R2reactors can resist the continuous organic shock load, and the system can recover in a short time; R3, R4and R0reactors could not recover during StageⅢ. (3) The system was sensitive to temperature variation, so temperature was an important factor to the system. (4) Anaerobic granular sludge were formed in R1, R2, R3, R4reactors, the amount of granular sludge sequencing was 89.02%, 82.46%, 16.44%, 36.54%, respectively. Compared to the support material size which was 0.15-0.20 mm; the size of granular sludge larger than 0.90mm was 41.5% in R1reactor, and 28.8% in R2reactor. (5) All the reactors had the ability of pH value moderation, so the pH value of all the system were stable. Since oyster shell is a solid waste, oyster shell powder used as the immobilization material not only has good effects of immobilization, but also has a strong economic competitiveness.
Optimum Gate Design of the Injection Mold on Plastic Air Intake Manifold of Engine Based on CAE Technique
Authors: Zhang Xiang Hong , Zhang Shi Qiang , Han Zhong Yi
Published: July 2011

For plastic air intake manifold, the warpage is difficult to solve. By simulating injection process with Moldflow, researched warpage, air traps, weld lines of intake manifold. Analytic result showed four gates are better to Xiali 4GB plastic air intake manifold, and obtained the best gate’s location. Summarized some important experience on designing injection mould of plastic air intake manifold. Made out very instructive work to succeed to design injection mould of plastic air intake manifold.
Synthesis, Characterization and Optical Properties Based on a Novel Re(I) Emitter with Bulky Building Block
Authors: Zang Tie Nan , Li Xiao , Yu Lian Shui , Ru Ji Ping , Chi Hai Jun , Xiao Guo Yong , Hu Zhi Zhi
Published: July 2011

A novel rhenium complex material, i.e., Re-APPP, (APPP, 2,3-acenaphtho[1,2-b]pyrazino [2,3-f][1,10]phenanthroline) was designed, synthesized in five steps from commercially available starting materials and characterized by FTIR,1H NMR and mass spectroscopy. The photophysical properties of this complex were studied. The absorption bands centered at ca. 326, 366 and 450nm of Re-APPP were attributed to the ligand-centered p→p* transition and the metal-to-ligand charge transfer dπ(Re)→π*(APPP) transition, respectively. Re-APPP was thermally stable with high decomposition temperature of 302°C. The organic light-emitting diodes using Re-APPP as a dopant emitter with the structures of ITO/m-MTDATA(10nm)/NPB(20nm)/CBP: Re-APPP(30nm)/BCP(10nm)/Alq3(30nm)/LiF(1nm)/Al(100nm) were fabricated and a broad electroluminescent peak at 550nm was observed. More importantly, the devices exhibited very small efficiency roll-off of only ca.45% which was probably attributed to its short luminescent lifetime.
Ultrafine α-Fe2O3 Nanoparticles: Facile Synthesis, Characterization and their Catalytic Activity on Ammonium Perchlorate
Authors: Zhang Yi Fu , Fan Mei Juan , Zhong Ya Lan , Nie Jiao Rong , Huang Chi , Liu Xing Hai
Published: July 2011

Ultrafine α-Fe2O3nanoparticles have been synthesized by a facile hydrothermal method. The products were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM). The diameter of the as-obtained α-Fe2O3nanoparticles is about 6.8 nm on average. The solvent have great effect on the morphology of the final products. Furthermore, the effect of ultrafine α-Fe2O3nanoparticles on the thermal decomposition of ammonium perchlorate (AP) was investigated by thermal gravimetric analyzer (TG) and differential thermal analysis (DTA). The thermal decomposition temperature of AP in the presence of α-Fe2O3nanoparticles was reduced by 99 °C.
The Effects of Hydrothermal Time on the Microstructure of Hollow Sphere Boehmite
Authors: Wang Jing , Jun Shi , Bing Xu
Published: July 2011

Using aluminum sulfate as precursor and urea as precipitator, hollow sphere boehmite was synthesized by hydrothermal treatment on 140°C for 24h. The time effect of as-synthesized product was studied by XRD, SEM and TG, et al. The results show that with the hydrothermal time increasing the product’s phase transformed from sodium sulfate aluminum to amorphous form to mixture phases of sodium sulfate aluminum and boehmite to boehmite. After 24h hydrothermal treatment, the product can completely change to boehmite. With the hydrothermal time increasing, the micromorphology of hydrolysis product experienced the evolution of smooth dense globe to core-shell sphere to hollow sphere.
Study on the Shear Strength Parameters for Municipal Solid Waste with Higher Content of Organic Matter
Authors: Zhang Zhen Ying , Wu Da Zhi
Published: July 2011

Basing on the new developed direct shear testing instrument and the tri-axial test instrument with large scale specimen, the shear strength parameters of municipal solid waste has been studied. The municipal solid waste is divided into three parts: the material that is easy to be biodegraded, reinforced material that is difficult to be biodegraded and the incompressible solid waste material. The proportions of these three parts are selected as 80%, 5% and 15%, respectively. A series of laboratory tests have been performed for different initial void ratios, different vertical pressures and different confining pressures applied on the test specimen. Testing results show that the initial void ratio is the main influence factor for the shear strength parameters of the municipal solid waste, the relationship between the shear stress and the shear strain is a strain hardening curve, the shear stress increases gradually with the shear strain. Besides, the principle effective stress increases with the axial strain and the confining pressure in a hardening increasing trend, and the principle effective stress decreases with the increase of the initial void ratio of the municipal solid waste. The shear strength shows a linear relationship to the vertical pressure applied on the test specimen, and it is in accordance with the law of coulomb. According to the testing results of the direct shear test and the tri-axial test, the shear strength parameters are obtained. The cohesion varies from 4.7 to 12.2kPa, and the internal friction angle varies from 14.5 to 28.2 degree.
The Application of Multi-Axial Warp Knitted Fabrics in Wind Turbine Blade
Authors: Wu Zhi Yun , Tie Le
Published: July 2011

With the consumption of fossil fuels and their serious impact on the environment, countries in the world are looking to the development of wind resources and the selection of material and the molding process in wind turbine blade have also put higher requirements. Multi-axial warp knitted fabrics become the good carrier of wind turbine blade with its structural diversity, comprehensive performance, good formability and permeability, etc.
Research on Combined Lifting Conceptual Design for Large-Scale Ship
Authors: Zhang Ji Ping , Tu Li Hua
Published: July 2011

Combined lifting conceptual design is put forward in the paper. Complete lifting for large subsection of large-scale ship can’t be achieved constantly according the capacity limit of lifting equipment, such the shipbuilding cost will increase greatly. So it is significant to study the conceptual design so as to make the best of the present equipments. Combined lifting conceptual is designed with two cranes and applied to the lifting about superstructure of 92500DWT bulk carrier, in which the software MSC Nastran is used to simulate the lifting process in allusion to the lifting condition and structure characteristic of superstructure. Results show that it is feasible to accomplish the complete lifting for large subsection through combined operation of different equipments. The research in the paper is significant for the lifting conceptual design of large subsection and with great value to popularize.
Research on the Synthesis of Titanium Nitride by Carbothermal Reduction Nitriding with Anatase and Flake Graphite
Authors: Wu Feng , Qu Dian Li , Li Zhi Jian , Li Xin Wei , Xu Na
Published: July 2011

Using anatase and flake graphite as starting material, titanium nitride was prepared by carbothermal reduction nitriding method under nitrogen gas pressure 0.05 MPa and flow rate 0.3 m3/h, at 1673K(1400°C).The proportion of nc and nTiO2 are 1.5:1,2.0:1,2.2:1 and 2.5:1. The phase composition and microstructure of titanium nitride were investigated by XRD and SEM. The results show that: titanium nitride can be prepared with anatase and flake graphite by carbothermal reduction nitriding method. When the proportion of nc and nTiO2 is 2.2:1 the quantity of titanium nitride is the most. Because the reacting temperature is low and the contact area of the anatase and flake graphite is small the large grain size and uniform grain size titanium nitride can not be obtained.
Preparation of Pt Colloids via a Wet-Chemical Method for Methanol Sensor
Authors: Pan Hong Cheng , Liu Jiang Tao , Liang Jin Ming , Li Dun Nan , Li Jian Ping , Zhu Wen Yuan , Mao Chang Jie
Published: July 2011

Pt colloids were synthesized by a wet-chemical method. The Pt colloids were modified on the glassy carbon electrode (GCE). The electrochemical behavior and electrocatalyst for methanol of the colloidal Pt-modified electrode in H2SO4medium were investigated. The results show that the as-prepared Pt colloids are good electrocatalysts for methanol oxidation and the oxidation current increases with methanol concentration in the range of 0.002 to 0.5 M. The colloidal Pt-modified electrode is simple, easy-to-use and reusable, showing promising applications in the electrocatalyst and determination of methanol.
Synthesis and Characterization of Nanosized Phpsphor SrS:Eu2+,Sm3+ by a Hydrothermal Process
Authors: Sun Jia Yue , Sun Ran Di , Du Hai Yan
Published: July 2011

Electron trapping materials SrS:Eu2+,Sm3+ were prepared by hydrothermal method at 200 °C for 5 h. The phase structure, microstructure and optical properties were characterized by XRD, SEM, EDAX, PL, PSL, and TL, respectively. The sample was stimulated by a 980 nm infrared laser after exposing to the sun light, It can be seen that the PSL emission spectra was a band spectrum with one peak at 605 nm, and this emission was ascribed to characteristic 5d → 4f transition of Eu2+, and the photo stimulated luminescence phenomenon was observed.
Test Research on Preparation of New Wall Material with Iron Tailings in Tangshan Area
Authors: Gan De Qing , Chen Chao , Zhang Jin Xia
Published: July 2011

This paper discussed the experimental resuhs of exploiting brick materials with iron tailing materials in Tanshang area. Through preparation of iron tailing bricks, the technical flow and production proportion was obtained. The results show that a burning-and steam curing-free brick product with a compressive strength of 28.30 MPa and Flexural strength of 5.63 MPa as the following: iron tailing; fly ash; sand; CaO; gypsum; cement. And long-term properties of a burning-and steam curing-flee brick is also studied by experiments in this paper. Put forward a new technique of making materials with iron tailing. At the same time, the micro mechanism of iron tailing brick was also studied with X-Ray Diffraction (XRD) and Scanning Electron Microscope(SEM).
Thermally Stable Blue NaBaPO4: Eu2+ Phosphor Synthesized by Combustion Method
Authors: Sun Jia Yue , Zhang Xiang Yan , Du Hai Yan
Published: July 2011

A blue-emitting phosphor, NaBaPO4:Eu2+, was prepared by solution combustion synthesis method, and its luminescence properties were investigated in detail. It was found that NaBaPO4:Eu2+could be efficiently excited by the UV-visible light of 230-420 nm and exhibited bright blue emission, which matched well with the emission wavelength of near-UV LED chips. NaBaPO4:Eu2+showed high thermally stable luminescence compared to commercial phosphor YAG:Ce3+. With the increase of the temperature, the normalized emission intensity of NaBa0.98PO4:0.02Eu2+decreased to 92.3% of the initial value at 423 K, and the emission band exhibited a little blue-shift.
Synthesis and Luminescence Properties of Red Emitting Phosphors Na3CaB5O10:Eu3+
Authors: Sun Jia Yue , Lai Jin Li , Du Hai Yan
Published: July 2011

A series of new Na3CaB5O10:Eu3+ phosphor was synthesized by a solid-state reaction method, and its luminescent properties were investigated. The phase formation of phosphors was confirmed by X-ray powder diffraction (XRD). The excitation spectra exhibited that the phosphors could be effectively excited by near ultraviolet (392 nm) and blue (464 nm) light, which perfectly match the emission wavelength of near-UV light-emitting diodes (LEDs). The emission spectra showed that two characteristic red emission lines peaking at 592 and 613 nm can be obtained upon 394 and 463 excitation with the chromaticity coordinates of (0.6347, 0.3649), which are due to 5D0- 7F1 and 5D0-7F2transitions of Eu3+ ions. The effect of Eu3+ concentration on the emission spectrum of Na3CaB5O10:Eu3+ phosphor was studied. The results showed that the emission intensity increased with increasing Eu3+ concentration, and then decreased because of concentration quenching. The obtained results indicated that this phosphor could be a promising candidate for near-UV white LEDs.
Structural Stability and Mechanical Properties of Ni Nanowires under Different Orientation and Size
Authors: Wang Li , Gong Jian Hong , Gao Jun
Published: July 2011

We employ density functional theory to investigate TiAl3/Al interfaces with the orientation of (001) [100]Al//(001)[100]TiAl3 by electronic structures, relaxed atomic geometries and adhesions. The preferable interfacial atomic structure is that wherein Al atoms continue on the natural stacking sequence of bulk TiAl3. Two types of TiAl3 (001) slabs, Ti-centered, all Al atoms, are adopted to compare interfacial energy, interfacial electronic structure. The calculated adhesion energies Wadof the two types of interface are very close, and are quantitatively in agreement with other calculated results of Al on the carbide and nitride, but much lower than the (111)Al[1 0]Al//(0001)TiB2[11 0]TiB2 adhesion energy. We have thoroughly characterized the electronic structure and determined that the metallic Al-3p and Ti-3d bonding constitute the primary interfacial bonding interaction.
Study of Ship Propeller Cut and Effecting on Main Engine Running Parameters
Authors: Wu Wan Qing , Zhang Hong Cun , Feng Xing
Published: July 2011

Attempt to reduce the CO2 emission from ships and sailing cost, the rate of propeller cut is calculated by established models of propeller diameter cut and propeller blade shape cut. According to the results, after cutting the edge of propeller under equal power, the rev is increased, but the open water efficiency and the speed both are decreased. However, the increase of the rev is quicker than the decrease of the speed. And the AVL BOOST is used to simulate MAN B&W 5S60MC main engine. The main running parameters under the 25%, 50%, 75% and 85% load are calculated. The result indicates that cutting the edge of propeller can increase the rev, improve lubricating and vibrating, reduce oil consumption and improve the economical efficiency.
Synthesis Aligned ZnS Nanocone and its Photoluminescence
Authors: Gong Jiang Feng , Zhu Wei Hua , Zhang Kai Xiao , Liu Ming Yi , Xie Hai Yan
Published: July 2011

We report the synthesis and characterization of ZnS nanostructures, which were grown by thermal evaporation of the ZnS powder at high temperature using iron network as the collection substrate. Scanning electron microscopy investigations show that the products present taper-like morphologies. Transmission electron microscopy studies indicate ZnS nanostructures are well crystallized. The formation mechanism of the novel nanostructure is discussed on the basis of the experimental results; The nanostructure is formed due to a fast growth of ZnS nanowire along [0001] and the subsequent “epitaxial” radial growth of the ZnS nanocone along the six (01-10) surfaces around the nanowire. A strong room-temperature photoluminescence in ZnS nanostructures has been demonstrated.
The Analysis on Causes of Rupture for a Sucker Rod Made of 20CrMo Alloy
Authors: Bian Yong Jun , Shi Wei , Lao Jin Yue , Chen Jie , Sun Shu Ling
Published: July 2011

Multiple types of analysis and examinations are applied to analyze the causes of rupture for a sucker rod made of 20CrMo alloy. Based on the results from macro- and micro-fracture analysis, chemical composition analysis, mechanics test and metallographic examination, the generation of cracks can be attributed to the irregularity and impurity in the coating of sucker rod; the stress fatigue from pulling and pressing and the stress corrosion. There is severe banded segregation, non-metal impurity and un-dissolved ferrite in the interior of the rod, meanwhile the poor heat treatment causes the property differences between the surface and core structures of the rod, thus reduces the overall properties of fatigue- and corrosion-resistance. Stress corrosion makes pits from cracks; the expansion of such corrosion pits reduces the size of effective loading area; and the failure to endure service load due to the reduction of loading area finally causes sudden rupture of the rod.
Study on the Application of the New Rock Drifting Technology in Zhangcun Colliery
Authors: Ma Li , Ding Zi Wei , Wen Xing Xing , Dong Ming Lei
Published: July 2011

Based on the main problems of tunneling technology and equipment configuration in the south side main entry of Zhangcun colliery, the mechanized line, support way and cement injection technique were investigated and reformed to solve the problems, then a new tunneling technology in south side main entry was proposed. The practical application result show that using different forms of mechanized tunneling lines can improve the loading and transportation efficiency of rock drift tunneling, correspondingly, improve tunneling speed of rock roadway; the support way and cement injection technique in new technology has a positive effect, create a condition for shortening the time of supporting on working face and cement injection and improve the tunneling speed greatly; with the new technology, the work efficiency improved from 0.88m/worker to 0.2m/worker, and increased by 227%.The project of two main entry driving will be completed in a year, and the ventilation system will be formed a year and a half in advance. According to the annual per capita salary sixty thousand Yuan, it can save labor costs 6.12 million Yuan. The good technology and economic effectiveness will be obtained.
The Tensile Properties of Glass Fiber Reinforced ABS Composites Filled with SiO2
Authors: Bao Jun
Published: July 2011

In this study acrylonitrile-butadiene-styrene (ABS) terpolymer was reinforced with glass fiber. The effects of glass content on the tensile properties of the composites were examined. Increasing the glass content in the ABS matrix from 10 wt% to 30 wt% resulted in improved tensile strength and tensile modulus. To obtain a strong interaction at the interface, SiO2 at varying concentrations was introduced into the GF composite. The incorporation and increasing amount of SiO2 in the composites increased tensile properties of the ABS/ SiO2/GF systems due to the improved adhesion at the interface,. These results were also supported by scanning electron micrographs of the ABS/ SiO2/GF composites, which exhibited an improved adhesion between the GFs and the ABS matrix.
Research on the Load to Ground on Missile Erection and Launching
Authors: Cheng Hong Jie , Zhao Yuan , Qian Zhi Bo , Zhan Jin Chun
Published: July 2011

In order to judge whether the launching site can bear the corresponding pressure and avoid yielding destabilizing destruction during the erection and launching process, the support load of missile erection mechanism in erecting and launching process are analyzed based on the hypothesis that the launching vehicle is bilateral symmetry object. In this paper, analytic method is used to calculate the load to launching site of the wheel davits and launch canister hydraulic legs in the whole launching route, and the place where the biggest load to launching site may appear is also ensured through the calculate procedure and result. Through analysis processing the calculation results, the decision for selecting launching position reasonably, and ensure launching missile safely and reliably are provided. The research conclusions can offer references for selecting and judging intensity of missile launching site when unsupported random launching way is applied.
Synthesis and Characterization of LiNi0.4Co0.2Mn0.4O2 Cathode Material via Urea Co-Precipitation Method
Authors: Zhong Sheng Kui , Xu Yue Bin , Li Yan Wei , Liu Chang Jiu , Li Yan Hong
Published: July 2011

LiNi0.4Co0.2Mn0.4O2 sampleswas synthesized via urea co-precipitation method. The XRD, SEM and electrochemical measurements were used to examine the structure,morphology and electrochemical characteristics, respectively. LiNi0.4Co0.2Mn0.4O2 powders show excellent electrochemical performances. The optimum sintering temperature and sintering time are 800°C and 20 h, respectively. The LiNi0.4Co0.2Mn0.4O2 powders shows the discharge capacity of 145.1 mAh·g-1in the range of 3.0-4.5 V at the first cycle, and the discharge capacity remains 132.3 mAh·g-1after 30 cycles. The urea co-precipitation method is suitable for the preparation of LiNi0.4Co0.2Mn0.4O2 cathode materials with good electrochemical performances for lithium ion batteries.
The Random Calculation Model of Chloride Ion Concentration in Concrete
Authors: Zou Hong Bo , Luo Xiao Yong , Chen Ai Jun
Published: July 2011

According to the analysis of the current chloride ion eroding model, it has been known that diffusion coefficient and chloride ion concentration on the concrete’s surface are random variables. Meanwhile the concrete protective thickness is also random variable because of manufacturing error and other reasons. So the diffusion process is the random process in fact. The random calculation model of chloride ion concentration in concrete has been deduced from the current model with the help of mathematical knowledge in this paper. Moreover, a satisfied effect has been achieved after comparing the calculated values with the test values. The calculation model is proved to be useful for life prediction and assessment of concrete structures.
Thermo-Mechanical Behavior of Fiber Reinforced MMC
Authors: Gao Suo Wen , Kang Yong Lai , Zhao Hai Bo
Published: July 2011

The viscoplastic behavior of the fiber-reinforced metal matrix composites under the thermomechanical loading is discussed in this study. The theories of micro-mechanics with the concepts of average stress and strain are adopted and developed to integrate matrix, coating and fiber properties for predicting the stress-strain response. It is reduced to a set of the ordinary differential equations of one order that can be resolved by the numerical solution algorithms based on the classical fourth order Runge-Kutta method.
Preparation of Cationic Cellulose Obtained from Wood Pulp Using the Microwave
Authors: He Hui , Chen Jian , Wang Shuang Fei , Wen Feng , Li Yong Hong , Zhu Hong Xiang , Wang Ying Hui
Published: July 2011

In this paper, the synthesis techniques of cationic cellulose by microwave irradiation method with bleached sulphate wood pulp and 3-chloro-2-hydroxypropyl tri-methyl ammonium chloride (CHPTMA) are investigated. The results show that the substitution degree of cationic cellulose and the Zeta-potential are the optimal under the conditions of the mass ratio of etherification agent to the cellulose 0.414, molar ratio of NaOH to ether agent 2.17, microwave time 9min, power 400W by the response surface experimental analysis.
The Design of Automatic Test System of High Speed PCM Signals
Authors: Su Shu Jing , Ren Jian Yun , Liu Su Hua , Yang Hai Guang
Published: July 2011

This paper presents an automatic test system which can output one 2Mbit / S PCM signals and one 10.2Mbit / S PCM signals for the device testing; the system wih self-test function could calibrate the output two PCM signals; when the equipment is in the state of testing, you can real-time monitor the status of the device through the PC
Properties and Morphology of Damping Composite Consisting of Polyester-Type Polyurethane/Epoxy Resin
Authors: Ma Chi , Chen Er Fan , Sun Ting , Xu Jun , He Wei , Li Na
Published: July 2011

A novel kind of damping composite was prepared with polyester-type polyurethane/epoxy and functional inorganic particle, and the dynamic mechanical property, morphology and thermal stability were investigated. The results showed that the effective damping temperature region was broadened from 43.9°C to 132.6°C through the introduction of polyester-type PU into the epoxy matrix. With addition of functional inorganic particle, the maximum of damping peak increased from 0.75 to 1.44, and this was due to the special form of functional inorganic particle restricting the motion of the chains. The morphology study proved the existence of the micro-phase separation, and it was also observed that uniformly dispersed functional inorganic particle tightly implanted into the polymer matrix. Thermogravimetric analysis showed the composite filled with functional inorganic particle had better thermal stability.
Test Research on the Surface Residual Stress of Dimensional Ultrasonic Vibration Grinding for Al2O3/ZrO2(n)
Authors: Wu Yan , Zhang Er Geng , Nie Wen Zhong
Published: July 2011

Based on the research for the structure of the ceramic nanocomposites’ intragranular for Al2O3/ZrO2(n)，we did the test by the workpiece two-dimensional vibration grinding(WTDUVG), and focus on analyzing the characteristic and the effect element of the two-dimensional ultrasonic vibration grinding ceramic surface residual stress by the XRD diffraction. The result show that ceramic dimensional ultrasonic vibration grinding surface tensile stress is less than the same conventional grinding (CG) surface under tensile stress; two-dimensional ultrasonic vibration grinding surface residual compressive stress than conventional ground surface residual stress under the same grinding. Material removal mechanism of the grinding nature of the surface residual stress, when the material removaled by ductile deformation, grinding surface equal residual stress; when the material removaled by brittle- ductile mixed mode, the grinding surface tensile stress reduced, because the fracture of the ground surface, tensile stress released. As a results, the grit size of grinding wheel, Grinding depth and workpiece mechanical properties are the main technology factors affected the nature and size of the residual stress of ground surface.
Research on Deformation Error of Links of Parallel Robot
Authors: Zhu Chun Xia , Luo Ji Man , Li Bin
Published: July 2011

Aimed at the effect problem of deformation of links on position error of parallel robot, the 3-TPT parallel robot is taken as a study object. The deformation error of links of parallel robot was built by error independent principle based on kinematics; the simulation analysis also is carried out by virtual prototype technique, and the effect law of deformation of links to error of parallel robot is given. The results showed that when the deformation length of links is given, the position error can be affected by deformation of each link and the coordinate position of origin in reference frame; In the beginning of parallel robot moving, the deformation of links are small, and with the time increasing, the deformation of links obviously affect the final position error of parallel robot. The two method proposed in this paper can be used for pre-estimating the error and reducing harmful effects.
Studies on Cutting Forces of High Volume Fraction SiCp/Al Composites with Ultrasonic Vibration High Speed Milling
Authors: Xiang Dao Hui , Yue Guang Xi , Zhi Xin Tao , Liu Hai Tao , Zhao Bo
Published: July 2011

The orthogonal method was used for analyzing the machining performance of high volume fraction SiCp/Al metal matrix composites (SiCp/Al MMCs) during high speed milling and ultrasonic high speed milling in this paper. The influence of cutting speed, feed rate and cutting depth on 3-directional forces were investigated. The results show that the cutting forces are decreased due to the cutting mechanism of SiCp/Al MMCs is changed from brittle cutting to ductile cutting during ultrasonic high speed milling. In addition, the chips exist in forms of C-type chips because of increasing rake angles. Ultrasonic high-speed milling is a more highly effective hard cutting way compared with high speed milling.
Research on the Extraction of Collagen from Scales of Tilapia
Authors: Huang Ru Qiang , Chen Shi Wen , Ma Guang Zhi , Yang Bin Wei , Guo Rui Juan , Li Qiu Xia , Zhong Jian Yan
Published: July 2011

The scales is a kind of precious resource with high nutritional value. The collagen protein from scales have a widely usage prospection in the areas of health food, cosmetics and so on, and they are worthy of further studied. In this paper, the method of extracting collagen protein from the scales of Tilapia was studied by pepsin hydrolysis. First, the calcium was demineralized from the scales with using of 0.5 mol/L EDTA solution, then, the scales hydrolyzed by pepsin was made to extract the collagen, and the content of L – hydroxyproline was taken as an index to measure the extraction percentage. On this basis, the collagen extract conditions was discussed from the Tilapia scales by the pepsin. It was showed that the pepsin hydrolysis conditions were the enzyme dosage 3%, citric acid 12g/L, hydrolysis time 20h, so the rate of collagen extraction is higher.
Research on New Varying Gear Ratio System
Authors: Xiang Dan , Chi Yong Bin , Huang Kai Qi , Xu Wei
Published: July 2011

A new automotive varying gear ratio system(VGRS)is introduced in this paper. Based on the analysis of foreign advanced theory in this field, a relationship among road wheel angle, steering wheel angle and vehicle speed is derived in order to achieve the optimum steering control for cornering and emergency maneuvers, whilst retaining the high-speed stability.
The Error Model Analysis in Wireless Network Base on the Network Simulator Tool
Authors: Wang Yi Xue
Published: July 2011

Since rapid development of wireless network technologies and individuals and enterprises’ urgent demands on application of wireless network, the use of wireless network has been spread rapidly and it is becoming more close to our life. It’s very essential for us to correctly understand and evaluate the characters and performance of wireless network by correctly understanding and studying the errors, using network analog software to simulate the error environment. This paper gives theoretical analyses and discussions to the IEEE 802.11 Protocol wireless networks on the basis of the simulator Tool –NS.
Study of Latex Migration Mechanism during Coating Consolidation
Authors: Du Yan Fen , Zang Yong Hua
Published: July 2011

A new mechanism for latex migration during coating consolidation was proposed, which suggested that Brownian motion induced particle diffusion, as described by the classic Stokes-Einistein Equation for dilute suspensions, was the main force driving latex particles to migrate to the coating surface. Series of latex clay coating colors were prepared and apllied on impervious substrate. By measuring carbon content at coating surface dried under different conditions, the new mechanism was validated.
Study on Cost Modeling Based on Feature Mapping Technology
Authors: Cao Lian Min , Wang Xi Wei , Zeng Qing Liang
Published: July 2011

This thesis presents and summarizes the theory of multi-domain feature mapping in details and provides a basis of the conversion from design domain features to cost domain feature. It studies the current cost modeling techniques based on cost feature, and describes the whole process of cost feature modeling. This thesis lays a foundation for cost estimation.
Optimization of the Synthesis of Er-Y-Ba-Na Quaternary Fluoride up-Conversion Phosphor and Luminescence Properties
Authors: Lu Li Ping , Zhang Xi Yan , Yu Chong Chong , Sun Peng
Published: July 2011

The wavelength of 1550nm has broad application prospect in the field of laser communications. A kind of Er-Y-Ba-Na quaternary fluoride sensitive to 1550nm was synthesized by high-temperature solid state reaction method and the synthesis conditions were optimized with orthogonal experiments. The samples present the green and red characteristic emission of Er3+ while the ratio of red to green emission intensity shows higher obviously compared with the representative fluoride upconversion material NaYF4: Er,Yb. The possible physical mechanism was discussed.
Study on Volatile Substances of Different Provenances Teak(Tectona Grandis L.f) Wood by TGA
Authors: Xie Cheng Ping , Li Kai Fu , Li Yong , Lin Jin Ling , Xu Kai Meng
Published: July 2011

The inherent odor of teak wood has repellent, and has an obvious effects on animals and human. In this work, the weight loss of volatile substances of different provenances teak including India, Nigeria and Thailand has been studied by TGA. The emmision of volatile substances starts at 30°C and ends at 100°C, lossing weight of the all samples are very less in the range of 100-200°C. When the temperature is in the range of 200-250°C, the hemi-cellulose and cellulose is pyrolyzed and the char starts to form. The results all the curves of TGA for the teak samples is similar, the sapwood losing weight is clearly higher than the heartwood for the same provenance teak. The volatile substances of sapwood are ranked as follows:V3071> V3070> V3072> V8024> V3074> V1009> V3078> V1007, and the heartwood: V3074> V3070> V1009> V8024> V3072> V3071> V3078> V1007.
Enhanced Infrared Normal Spectral Emissivity of Microstructured Silicon at 100 to 200°C
Authors: Feng Guo Jin , Wang Yu , Li Yuan , Guo Ting Ting
Published: July 2011

The infrared normal spectral emissivity of microstructured silicon prepared by femtosecond laser was measured for the middle infrared waveband at temperature range 100 to 200°C. Compared to that of flat silicon, emissivity was enhanced over the entire wavelength range. For a sample with different spike height, the minimum emissivity at a temperature of 100°C is more than 0.6. Although the average emissivity is less than Nextel- Velvet-811-21 Coating , it can be used stably at more wide temperature ranges. These results show the potential for microstructured silicon to be used as a flat blackbody source or silicon-based devices.
Investigation of the Corrosion Resistance of Bainitic Steel
Authors: Wang Zhi Fen , Sun Yi Qiang , Han Rong Dong , Wu Li Xin
Published: July 2011

The corrosion resistance of bainitic steel was compared with a weathering steel 09CuPCrNi through accelerated corrosion tests. The results indicated that the corrosion resistance was better for bainitic steel than 09CuPCrNi based on the weight loss. The characteristics of the rust layers indicated the rust layers on two steels are composed of two parts: the loose outer rust layer and the dense inner rust layer. The rust layers are mainly composed of goethite (α-FeOOH) with a few of lepidocrocite (γ-FeOOH). The factors including homogeneous microstructure and lower carbon content played important roles in enhancing the corrosion resistance of bainitic steel.
Analysis on the Cause of Longitudinal Crack on the Hot-Rolled Ribbed Bar Surface
Authors: Zhao Jun Xue , Fan Jun , Chen Yuan Ping , Wang Peng Fei
Published: July 2011

Longitudinal crack on HRB335 hot-rolled ribbed bar surface in cold bending test in HISCO was ever a problem that caused great economic losses. To find the main reason, continuous cast product macro-acid etching test，metallographic examination，scanning electron microscope and EDAX are carried out. It is regarded that the defect is mainly caused by serious subsurface blowholes and internal cracks in the cast product，which can run through the surface in the later hot working process and are oxidized. As a result, the inner surface of these defects can not be welded-on in the rolling process and the cracks happen finally. Related measures are suggested to eliminate the defect.
Influence of Temperature Rise during Finishing Rolling on the Mechanical Properties of T8 Cord Steel
Authors: Wang Meng , Wang Li Ping , Wang Li Feng , Li Long Fei
Published: July 2011

Different temperature rises during finishing rolling of T8 cord steel were obtained through normal procedure (process 1) and controlled cooling procedure (process 2), and its effects on the microstructure and the mechanical properties were studied. The microstructure of T8 cord steel obtained by process 1 consisted of clusters of coarser and inhomogeneity sorbite colonies, and that obtained by process 2 consisted of equiaxed and finer sorbite colonies, with the similar interlamellar spaces of sorbite cementite in the two microstructures. The results of tensile tests showed that the tensile strength of T8 cord steel obtained by process 2 was higher than that obtained by process1 by 20MPa, with higher reduction of area and tensile elongation. In addition, the tensile fracture of T8 cord steel obtained by process 1 consisted of a lot of lotus cleavage plane, while that of T8 cord steel obtained by process 2 mainly consisted of finer dimples. That indicated that the smaller temperature rise of process 2 during finishing rolling can improve the mechanical properties of T8 cord steel.
The Research on the Telecom Customer Churn Based on System Dynamics
Authors: Wang Yong , Yang Li , Li Min
Published: July 2011

With the rapid development of telecommunication, the competition of telecom market becomes more and more drastic. It is very important for telecom operator to research how to keep from the telecom churn. In the paper, a model used to simulate the behavior of customers is constructed based on system dynamics. The causal loop diagram and flow diagram of the telecom churn is proposed and some simulation results are obtained. According to these simulation results, we give some suggestions to reduce the customer churn, which are valuable for telecom operators to maintain users, formulate marketing strategies and reduce operating costs.
Communication Software Design of Remote Monitoring System for Motor Excitation Parameters Based on PSTN
Authors: Zhang Xiao Qing , Chen Li Juan
Published: July 2011

Based on the remote maintenance of motor exciation, this paper discusses the function design and solution method of communication software which is used in remote monitoring system of motor exciation. It mainly introduces the process of data transmission founded on the Public Switched Telephone Network (PSTN) and key problems of the implementation of communication MSComm control in VC++.
CNC Remote Monitoring and Fault Diagnosis Based on Multi-Agent Technology
Authors: Peng Chong , Liu Qiang
Published: July 2011

The multi-agent technology and their applicability to CNC remote monitoring and fault diagnosis system (RMFDS) is discussed in this paper. According to the functions of sub-systems of RMFDS, a layered architecture of CNC RMFDS based on multi-agent technology is proposed. Moreover, task planning of multi-agent is presented, and the design of agent is realized by self-deciding mix type extended Belief-Desire-Intention (BDI) This architecture is useful for providing an open and integrated solution of network-based manufacturing CNC RMFDS.