bluuebunny/crossref_metadata_2025 huggingface dataset:
Transmission Properties of the Symmetrical Structure of One-Dimensional Photonic Crystal Quantum Well
Authors: Su An , Liang Yu Juan
Published: March 2011

By using the transfer matrix method studying the transmission spectra and the interior electric field distribution of symmetric structure of one-dimensional light quantum-well (AB)m(ABCBA)n(BA)m , results show that with the increase of n, (2n-1) resonance transmission peaks appear in the transmission spectra of photonic quantum-well (AB)5(ABCBA)n(BA)5, and quantization effect is obvious; strong localized electric field appear in internal field Quantum-well : when n=1, the intensity of internal localized electric field of light quantum-well (AB)m(ABCBA)1(BA)m increases with m increasing, while m=5, intensity of internal local electric field light quantum-well (AB)5(ABCBA)n(BA)5 don’t change with the change of n, but local area expanded. These optical transmission properties provide guidance for the design of new optical device of photonic crystal.
Study on Preparation and Application of High-Performance Cu-Al Composite Row
Authors: Liao Wen Jun , Wang Yu Xin , Zeng Le Cai , Yan Biao
Published: March 2011

Cu-Al composite row was produced by continuous cast-rolling technique and metallurgical bonding interface was achieved. The microstructure of interface and the composite mechanism was investigated. Isolating switch was fabricated by using copper-aluminum composite row as current-carrying conductor. Main performance index and technical parameters were evaluated. The composite row shows excellent mechanical property and conductivity: overall tensile strength of 102MPa, elastic modulus of 1.5GPa, resistance rate of 0.0216Ωmm2/m and carrier density of 750A. The results present that the temperature rise, circuit resistance, mechanical life and other properties of the copper-aluminum composite row can meet the requirements of being the current-carrying conductor of isolating switch.
Hot Deformation Behavior of 7075 Aluminum Alloy Bar Compressed with Different Orientation at Elevated Temperature
Authors: Zhang Zhi Min , Yang Yong Biao , Meng Mu
Published: March 2011

Hot compression tests of 7075 aluminum alloy were carried out on the Gleeble-1500 thermal simulation machine at strain rates of 0.1s-1 ，1 s-1 and at temperatures of 320°C,400°C,480°C. The compression direction are aligned at 0°，45°and 90°to the axis direction of the bar. Microstructure was studied using Optical Microscopy. The results show that the true stress of all three specimen increases with the decrease of temperature and the increase of strain rates. The true stresses rose rapidly to peak value and then held constant or decreased with the increase of the true strains at different deformation conditions. The yield strength of the specimens in 0° to the axis direction is higher than that of 90°, and 45° specimen has the lowest yield strength at different deformation conditions, which could be attributed to the elongated grain structures of the bar.
Deposition of TiO2 Thin Films Using Magnetron Sputtering
Authors: Guo Xing Long
Published: March 2011

TiO2 with 20nm in diameter have been prepared by using magnetron sputtering technique. The structure of these powers was determined by X-ray diffraction experiments. The average grain size and particle size in these powers were measured by the line profile analysis method of X-ray diffraction patterns and by scan electron microscopy, respectively. The thin films were investigated by using XRD, SEM measurements.
Preparation of Dense Ultrafine TiAl Alloys by Spark Plasma Synthesis from Mechanically Activated Powders
Authors: Wang Zhi Wei , Zhang Dong Dong , Zhang Xiu Hong
Published: March 2011

Powder of Ti-46at%Al alloy was synthesized through mechanical activation (MA) and then sintered and concurrently consolidated in a short sintering time of 900 s by using spark plasma sintering (SPS) process. The XRD and SEM profiles show that the microstructures of TiAl alloys contained γ TiAl and small amount α-2 Ti3Al phase, whose amount can be controlled by the sintering temperature. The compacts retained the original fine-grained fully densified bodies by avoiding an excessively high sintering temperature. The alloys sintered at higher temperature with this process showed a coarser microstructure. So it is possible to produce dense nanostructured TiAl alloys by mechanically activated spark plasma sintering (MASPS) within a very short period of time.
Study on the Analysis of Crack Causes and Control Measures of Prestressed Concrete Cylinder Pipe
Authors: Wang Rong Lu , Huang Hao , Dou Tie Sheng , Li Meng
Published: March 2011

Being aimed at prestressed concrete cylinder pipe itself characteristic of structure and production process, PCCP cracks were classified, the classification and kinds of the crack causes are analyzed, the control measures and repair methods of different cracks is also discussed.
Optimization Design of CTP Imaging Drum Based on ANSYS
Authors: Xing Jie Fang , Ni Xiao Yu , Zhang Jie , Chen Du Juan
Published: March 2011

In the imaging process, the deformation of the plate caused by the structure of the drum, finally affecting the quality of the plate, we analyze and optimize the structure of the drum using the finite element method. Selecting the larger three factors affecting the plate deformation as the design variables, and taking minimizing the maximum deformation of the plate as the objective function, we establish the optimization model of the structure of the drum. We use the APDL parametrization language to create the geometric model and finite element model of the drum, and select the contact element to simulate the relationship between the plate and the surface of the drum, and use ANSYS software to optimize the optimization model. It is shown form the result that: the minimum of the maximum deformation of the drum getting from the 8th iteration is 0.0021535mm, significantly reduced compared with the initial value 0.002864mm. At this point, the internal diameter D2 of the drum is 300.04mm, the groove width L2 is 14.323mm, the external diameter of groove height D3 is 338.44mm. It indicates that that the smaller the internal diameter of the drum and the narrower the guide groove on the drum surface are, the smaller the maximum deformation of the plate is, and the guide groove height has little influence on the deformation. The results can be provided as theoretical reference for the design of CTP imaging drum, which has popularization and application value.
Evaluation of Fatigue Properties for Ultraviolet Radiation Aged Bitumen and Mixture
Authors: Wu Shao Peng , Han Jun , Liu Xing
Published: March 2011

Bitumen is widely used in road construction. Due to heavy traffic loads and environmental factors, bitumen properties will change during service life. Bitumen will age due to diffusion of oxygen and UV radiation. Repeated loading will result in decreasing strength because of fatigue. In this paper, one layer clay powder was used to modify base bitumen with different mass contents. Then the influences of ultraviolet radiation (UV) aging on the dynamic fatigue properties of the layered clay powder were evaluated by Dynamic Shear Rheomoter (DSR) and Universal Testing Machine (UTM). The ageing evaluation shows that the ageing resistance of bitumen is improved and this improvement is more notable in bitumen fatigue than mixture.
Early Warning of the Financial Risk on the Power Industry
Authors: Zhou Lei , Jiao He Jun
Published: March 2011

The financial pre-warning is an important resource for establish financial policy. Aimed at the character of the power industry, the least squares support vector machine prediction model is given based on the principle of the statistical learning theory and structural risk minimization. The result is given that the forecasting model is effective and offers a new method to forecast the financial risk.
Research on the Strategy for Regional Tourism Cooperation in Hubei Province
Authors: Wang Yan , Cao Shi Tu
Published: March 2011

Regional tourism cooperation is the result of a relatively developed tourism and the inevitable choice of implementing the strategy of leap-forward development. The implementation of the strategy of rise of “Central China” provides a rare opportunity for the development of regional tourism cooperation in central region. The paper makes a comprehensive analysis of current development of Hubei tourism, put forwards the idea and hierarchical model of regional tourism cooperation in Hubei in the new era in light of strengthening regional cooperation, and points out the direction for Hubei tourism development.
The Experimental Study on College Psychical Education Professional Men Load Combination Methods of Fast Strength
Authors: Xiong Jian She
Published: March 2011

Through training for six months to the three no different groups using the load combination method of fast strength, then horizontally,vertically compare and analyze the fast strength indicators statistic results of three groups,The aim is to find out the best load combina- tion methods of fast strength. It is an indisputable fact that fast strength has played a decisive role in most sports. However, fast strength has a wide variety of training methods and means, and different situations may use different training methods and tools; then no matter what kind of training methods and means, must add a certain load. And according to training requirements, changes in training load should also continue to impose different load combinations. Then how the load can be combined to improve the fast strength more effectively and economically? In this regard, in order to provide a quick reference for the efficient improvement of strength training, having adopted dovuments, interviews with experts and other methods, based on the results of previous studies, we have selected three combiniations of loads to find the best combination of training load method by six-month experimental study on three no different groups using three different load combination methods.
A Study of Comprehensive Testing of Moving Ability of Volleyball Players and Modular Training
Authors: Wang Jian Ming
Published: March 2011

The author studied and designed a simple, scientific and controllable comprehensive pace-moving testing method according to the exertion of skills in games done by volleyball players. The author chose and decided the test item system he used, established dynamic state digital simulation model, set up criteria for evaluation of player training, and made analysis and decisions about forward looking training goals for coaches of volleyball teams. Then the author carried into execution special pace-moving modular training, found data for scientifically adjusting and controlling the training course of quick speed pace move of volleyball players.
Research on Communication of New Media Mobile in China
Authors: Xie Yi
Published: March 2011

The questionnaire and logical reasoning are adopted in the thesis to research new media issues in China Mobile. The results show that more and more people use mobile new which has unique advantages and great potential for development. However, there are also shortcomings. mobile new media development strategy proposed for improving network services, lower fees and charges; breakthrough innovation, and diversification; prominent difference distributing content; with localized spread of manufacturing its own characteristics; improve the management mechanism of the new media movement .
Research on the Principals’ Participating in Physical Education Curriculum Implementation
Authors: Hu Qing Shan , Ye Nan
Published: March 2011

This paper discussed the influencing factors of principals’ participating in physical education curriculum implementation. The result showed that principals’ role in the implementation of the physical education curriculum should not be underestimated and neglected. After analyzing the factors of principals’ participation in the implementation of the physical education curriculum, the author held that helping principals to correct sports realizes, foster harmonious curriculum concept, upgrade courses accomplishment, converse courses leading role, reduce administrative burdens and so on, which were the suggests to promote principals’ participation in the implementation of the physical education curriculum.
Research of the Sensitivities of Fracture Strength of Porous Ceramic Materials to the Relevant Parameters
Authors: Li Wei Guo , Wang Ru Zhuan , Li Ding Yu , Fang Dai Ning
Published: March 2011

In this paper, based on the study of effects of various physical mechanisms on the fracture strength of porous ceramic materials, a thermo-damage strength theoretical model applied to each stage of temperature is established. Using the model, the sensitivities of fracture strength to relevant parameters and their variation with temperature are studied in detail. The results show that under low temperature the strength is sensitive to the changes of porosity, pore size and pore shape factor, while under high temperature the effects of porosity, pore size and pore shape factor on the strength compared to the temperature are negligible, yet the strength is very sensitive to the Young’s modulus, thus the Young’s modulus is the dominant of strength under high temperature. This study will provide a theoretical basis and guidance to the design and application of porous ceramic materials.
Screw Inspection Optimized System Design and Implementation
Authors: Liu Yang Kuan , Cai Tao , Ju Shi Guang
Published: March 2011

In machinery and equipment manufacturing industry, screw is an important part. Not only as a precision screw precision transmission components, but also commonly used for precision measuring devices. Precision screw itself directly affects the accuracy of precision machine tools and precision measuring instruments for transmission, positioning precision and accuracy, and thus the processing and inspection of precision screw is higher demanded. Traditionally, screw inspection is usually done by manual and the quality of inspection is not high, with very low inspection efficiency. To solve these problems, optimized system for screw inspection was designed and implemented. Using the Quartile range method in Statistics to remove outliers, and with the help of kalman filter, systemic error is got rid of. With these methods, raw measurement data is analyzed and processed, and inspection report is generated. The efficiency of screw inspection is highly improved.
Study on the Energy Saving Control of Groundwater Source Heat Pump Air Conditioning System Based on Integrated Optimization Viewpoint
Authors: Wang Zhi Wei , Shi Lei , Li Peng , Cao Wei
Published: March 2011

For an actual project of groundwater source heat pump air conditioning system in Yangli region, by the field investigation on energy usage status of the system operation, analyzes the causes of non-energy-saving operation such as water pumps energy consumption too much, presents an intelligent control strategy of the system energy saving operation for solving the problem, performs the program design of energy saving control based on Programmable Logic Controller (PLC) and variable frequency technique, finally predicts the system energy saving potential.
Preparations Effects on Amorphous/Nanocrystal Ni-Mo Alloys Structure and Properties
Authors: Li Ning , Gao Cheng Hui , Cheng Guang Ming
Published: March 2011

Ni-Mo alloys have been studied as a prospected cathode for its higher hydrogen evolution reaction properties than other binary compounds. The eletrodeposition parameters and its effects have been investigated in forming Ni-Mo alloys in the present study by measuring the structure and properties of deposits. The forming mechanism of Ni-Mo amorphous deposit is discussed from point of the elements component of view. The X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) microstructures show that the molybdenum content in the deposit is increased with the molybdate concentration increase, and the deposit structure can be parted several stages- nanocrystal, nanocrystal/amorphous, amorphous, crystalline, or the mixed configuration due to the variation of Mo atom content. The forming mechanism of the deposit of Ni-Mo alloys is attributable to the repulsive aggradations as of the molybdenum chemical properties and electronic shell structure. When the atom rate of Ni/Mo is higher than 0.35, the deposit is the face center cubic (fcc) configuration, while lower than 0.35, the deposit is the monoclinic hexagon crystalloid configuration or body center cubic (bcc) dimensional structure.
An Enhanced Luminescent CdTe/ZnS Core-Shell Quantum Dot: Synthesis, Characterization, and its Optical Properties
Authors: Xu Shi Chao , Yang Yue Qian , Liu Yan Shan , Miao Heng , Dong Mei , Yang Juan , Zhang Ji Mei , Dai Zhao , Zheng Guo , Sun Bo , Sun Shu Qing , Jiang Zhen Zhong
Published: March 2011

The core-shell CdTe/ZnS quantum dots were prepared with an improved process in aqueous phase. CdTe QDs were synthesized under conditions of pH 9.1, 96 °C, refluxing for 5h, and which was used as core material; ZnS was formed as shell material to enhance the optical properties. Optical properties were characterized with fluorescence spectrum (FS), and morphology of QDs was investigated via transmission electron microscopy (TEM) method. Moreover, composition and formation of CdTe/ZnS core-shell QDs was characterized via x-ray diffraction (XRD) method. Optimum conditions were investigated to obtain the qualified CdTe/ZnS core-shell QDs, the results indicated QDs with high quantum yields and fluorescence intensity were achieved under conditions of pH 9.0, 45 °C, refluxing for 1h, and v/v/v ratio of CdTe/Na2S/ZnSO4 is 4/1/1. The TEM data indicated that average size of 5 nm CdTe core was prepared, and CdTe/ZnS core-shell QDs with average size of 11 nm were achieved under the optimum conditions. ca 30nm of red shift of a maximum emission wavelength from ca 530 nm (CdTe) to 560 nm (CdTe/ZnS) was observed via FS under the optimum conditions, which inferred the growth of QDs and formation of ZnS shells. Furthermore, the enhanced fluorescence intensity of CdTe/ZnS core-shell QDs was detected and over two times of fluorescence intensity was increased after formation of ZnS shell. The obtained QDs will have great potential application in biological researches and biosensing system based on fluorescence resonance energy transition (FRET).
Influence of Quenching Parameters on Mechanical Properties of 7075 Aluminum Alloy
Authors: Shi De Quan , Gao Zhi Wei , Gao Gui Li , Wang Xu Dong , Tang Hui Ying
Published: March 2011

By using the universal mechanical testing machine and SEM, the influence of quenching parameters on the mechanical properties of 7075 aluminum alloy has been studied, and the optimal quenching parameters have been got. The experimental results show that the temperature range of the quenching treatment is too wide. However, the over-burning will occur when the temperature is above 490°C. So the optimal quenching temperature is from 465°C to 475°C. The water temperature and the transfer time are below 40°C and 30s, respectively. The time interval between the quenching and aging treatment is found to have little influence on the mechanical properties of 7075 aluminum alloys.
Magnetic P(St-MA) Microspheres：Preparation, Characterization and Interaction with BSA
Authors: Ding Ling , Li Xi , Zhang Chao Can
Published: March 2011

Taken the nanoparticles Fe3O4 as the magnetic carrier, and styrene ( St ) and Methyl Acrylate (MA) as the monomers, the magnetic polystyrene-methyl acrylate (P(St-MA)) microspheres were prepared by microsuspension copolymerization. The effect of various parameters(e.g. reaction temperature, initiator, Fe3O4/styrene ratio and disperser) on the properties of the P(St-MA) microspheres were studied.The microspheres were characterized by different techniques (e.g. SEM, VSM, TG-DSC, FTIR, ). The interaction of magnetic microspheres and BSA were studied by microcalorimetry. The results showed the P(St-MA) microspheres, with abundant –COOH, superparamagnetic and high magnetic content, were possessed much higher protein adsorbance compared to those of magnetic polystyrene(PS) microspheres.
Recognition of Vehicles on Geometric Morphology
Authors: Qin Guo Feng , Sun Yu , Li Qi Yan
Published: March 2011

Detection of vehicles plays an important role in the area of the modern intelligent traffic management. And the pattern recognition is a hot issue in the area of computer vision. This article introduces an Automobile Automatic Recognition System based on image. It begins with the structures of the system. Then detailed methods for implementation are discussed. This system take use of a camera to get traffic images, then after image pretreatment and segmentation, do the works of feature extraction, template matching and pattern recognition, to identify different models and get vehicular traffic statistics. Finally, the implementation of the system is introduced. The algorithms of recognized process were verified in this application case.
The Effect of POSS-NH2 on the Curing Reaction of Cyanate Ester Resin
Authors: Zhang Zeng Ping , Pei Jian Zhong , Chen Shuan Fa , Du Hong Zhao , Wen Yong
Published: March 2011

A functional POSS monomer (POSS-NH2) was employed to modify cyanate ester (CE) resin. A series of POSS-NH2/CE hybrids containing different content of POSS have been prepared by melt casting and then curing. The curing kinetics and reaction mechanisms of the resin systems were studied by using FT-IR. The experimental results show that both temperature and POSS content may influence the curing reaction of CE. POSS-NH2 mainly displays the catalytic effect at higher temperature (220oC). While the circumstance is more complex at lower temperature (190oC).
Improvement the Elongation at Break of Reclaimed Rubber
Authors: Meng Xiang Hai , Zhang Yi He , Wang Fan , Zhang Zhi Lei , Zhang Rui , Lv Feng Zhu , Zhou Feng Shan
Published: March 2011

The reclaimed rubber was used for many fields, but the mechanical properties especially elongation at break of reclaimed rubber couldn’t meet the requirement due to its recycle property. It was proved that the wollastonite with fibrous structure could improve the mechanical properties in many composite. In this study, the reclaimed rubber modified by wollastonite was prepared by the mechanical agitation and open roll mixing methods. The composite was characterized and tested after the renewed vulcanization, and the mechanical properties could be improved. It was observed from experimental data that the elongation at break could enhance from 238% to 300%. Moreover, the tensile strength could increase to some extent.
Study on the Lipid-Lowering Effect of Water-Soluble Chitosan Nanoparticles and Microspheres In Vitro
Authors: Gao Bing , Wu Si Hui , Zhang Hong Liang , Tao Yi , Su Zheng Quan
Published: March 2011

Objective: To prepare water-soluble chitosan(WSC) nanoparticles(WSC-NPs) and microspheres(WSC-MPs) , exam the morphology and particle sizes of them and study their effect on lowering lipids . Methods: WSC-NPs and WSC-MPs were prepared by ionic gelation process and spray-drying methods respectively. The effect of WSC-NPs and WSC-MPs on lowering lipids was evaluated by measuring its binding capacities of lipids in the conditions simulating human gastrointestinal tract in vitro. Also, the morphology and particle sizes of WSC-NPs and WSC-MPs were examined under scanning electron microscopy (SEM) and particle sizer. Resluts: WSC-NPs and WSC-MPs were nearly spherical in shape and the mean particles size varied from 200-400 nm and 3-7 μm respectively; The lipids-binding capacities of WSC-NPs and WSC-MPs were more effective compared with water-soluble chiosan. The lipids-binding capacity were enhenced when the particle size were decreased. Conclusion: WSC-NPs and WSC-MPs will be better fat-lowing food additives to replace water-soluble chitosan.
Testing Study on Ratio of Crack Widths on Two Sides of Protective Covering of Steel-Lined Reinforced Concrete Penstock
Authors: Deng Hua Feng , Guo Jing , Zhu Min , Lu Tao , Zhou Ji Fang
Published: March 2011

According to mechanic properties of steel-lined reinforced concrete penstock, author abstracted and simplified its mechanical model, designed and produced 20 axis tensile structures of reinforced concrete, and proposed the test methods on the ratio of crack widths on two sides of concrete protective covering. The measured results are consistent with the calculation results of empirical formula, which on one hand shows the test scheme is feasible, on the other hand verifies the rationality of empirical formula, and it has important significance for perfecting the theory and application of steel-lined reinforced concrete penstock.
Characterizations of Plating Structures and Electromagnetic Shielding Properties of the Micron-Sized Flaky Silver-Coated Copper Powder
Authors: Guan Deng Gao , Sun Chuan Min , Lin Jin Hui , Sun Yao , Xu Guan Li , Lei Ting
Published: March 2011

A new kind of the micron-sized flaky silver-coated copper powder was prepared by electroless silver plating in this paper. Its plating structures were characterized by XRD, SEM and EDS. And a new kind of the electromagnetic shielding composite coatings containing 60 wt% the micron-sized flaky silver-coated copper powders and 40 wt% epoxy resin was prepared. Its electromagnetic shielding properties were analyzed by coaxial transmission line equipment. The study results show the micron-sized flaky silver-coated copper powders are composed of 91.35 wt% Cu and 8.65 wt% Ag and have high width-thickness ratio and crystal structure characteristics. In the frequency range of 0.3-1000 MHz, the shielding effectiveness of the coatings is up to 70.15-77.46 dB and increased an average of 22.18 dB compared with the coatings containing 60 wt% micron-sized flaky copper powders when the coating layer thickness is 300 μm. It is seen that the electroless silver plating method effectively improves the inoxidizability, conductivity and electromagnetic shielding properties of copper powders.
Control Design Applied to a Micro Electro Mechanical System: MEMS Comb Drive
Authors: Bonato Altran Alessandra , Chavarette Fábio Roverto , Minussi Carlos Roberto , Peruzzi Nelson José , Marthins Lopes Mara Lúcia , Barbanti Luciano , Damasceno Berenice Carmargo
Published: March 2011

This paper presents the linear optimal control technique for reducing the chaotic movement of the micro-electro-mechanical Comb Drive system to a small periodic orbit. We analyze the non-linear dynamics in a micro-electro-mechanical Comb Drive and demonstrated that this model has a chaotic behavior. Chaos control problems consist of attempts to stabilize a chaotic system to an equilibrium point, a periodic orbit, or more general, about a given reference trajectory. This technique is applied in analyzes the nonlinear dynamics in an MEMS Comb drive. The simulation results show the identification by linear optimal control is very effective.
Study on the Application of Viscoelastic Material in Sound Absorption Structure Model
Authors: Zhang Wen Cheng , Zhou Sui Hua , Jiang An Lin
Published: March 2011

Study on new absorption materials is important to the sound stealth of targets underwater. The simpler formulae of calculating multiple-layer absorption model is educed with transferring matrix. By numerical simulating, the relation between model’s acoustic characteristics and material parameters of each layer is provided.The study shows that a better performance is acquired when material Young’s modulus changed dynamically with frequency by a certain rule. On these basises, simulation contrast of the absorbing performances between styrene-butadiene rubber(SBR) and Spray Poiyurea Elastomer(SPUA) was carried out. The simulating result and the experiment provided that SPUA has good performance.
Distribution of the Molecule Weight and Grain Size of Medium Temperature Phenol Formaldehyde Resin
Authors: Jian Han , Guo Yie
Published: March 2011

The molecule weight and distribution of molecule weight of a kind of medium temperature phenol formaldehyde resin（MTPF）was detected through Liquid Chromatogram-mass spectrum instrument（LC-MS）．The result showed that the distribution scope of molecule weight of the MTPF during the initial stage was approximately 200-400，and the degree of polymerization of the MTPF molecule was 2-4，At the same time，the MTPF during initial stage still has a certain amount of medium outcome hydroxymethyl phenol which was formed through the addition reaction between phenol and formaldehyde．The detection result，from the MTPF during initial stage through ZEN3600 nanometer grain analysis instrument， proved that the grain size of the MTPF during initial stage was about 80-180nm，and the distribution of the grain size presented a normal one that the grain size 96-130nm was about 67%．
Consistency of JIC and KIC on Characterizing the Fracture Toughness of Small Size Samples
Authors: Wan Xiao Jun
Published: March 2011

Fracture toughness is one of the important parameters to characterize the general mechanical properties of materials, Tests for determining are usually performed on a fatigue test machine. However, for some large structure parts, such as hydropower generator rotor, weighing several tons or even one hundred tons, it requires large samples for testing, which results in the large loss of the materials.. In the present work, we use a small sample to measure its , and the consistency of and on characterizing fracture toughness of small size samples was analyzed. Both the experimental results and theoretical calculations show that, under certain experimental conditions, can replace to characterize the fracture toughness.
Measurement of Dynamic and Static Modulus for Thin Particleboard
Authors: Yan Hai Cheng , Zhang Hou Jiang , Zhu Lei , Sun Yan Liang
Published: March 2011

This document explains and demonstrates a new means of dynamic and static bending evaluation of modulus of elasticity for small samples of thin wood composites. This means is based on the principle of cantilever-beam bending and free vibration, and a cantilever beam testing apparatus has been developed according to this principle. Three kinds of thin particleboard obtained from market were processed and tested. The testing results show that there are significant linear correlations between the cantilever dynamic modulus and the static bending modulus. Through this method, it is feasible to measure the modulus of elasticity for thin wood composites, and compared with traditional method, the static bending test; it can save more time and reduce damage.
Study on the Solidification Microstructure of Aluminum Alloyed High Speed Steel
Authors: Zhou Xue Feng , Yin Xiao Yan , Fang Feng , Jiang Jian Qing
Published: March 2011

The present work has investigated the effect of aluminum on the solidification microstructure of M2 high speed steel. The results show that the as-cast structure is refined and the networks of M2C eutectic carbides are distributed more homogeneously with the addition of aluminum. Meanwhile, the morphology of M2C changes from the fibrous shape to the plate-like one. Despite of the same crystal structure, the microstructure differs greatly between the two carbides. Compared with the fibrous M2C, micro-twining is formed in the plate-like M2C, resulting in the orientation changes between different plates. It is expected that the solid/liquid interface structure of M2C may evolve from the non-faceted into the faceted due to the addition of aluminum.
Influence of Resin Content on Composite Materials Railway Sleepers for Physical and Mechanical Properties
Authors: Sun Yue , Xiao Sheng Ling
Published: March 2011

It studies the influence of resin content on composite materials railway sleepers for physical and mechanical properties,which is for the preparation of composite materials railway sleepers.It used resol resin setting hot pressure at 2.5Mpa, hot pressing temperature at 170°C, pressing time at 5-6min. The results showed that as the resin content increases, the static bending strength (MOR) first increased and then decreased, the internal bond strength (IB) rised, 2h thickness swelling (2h TS) decreased. Through the analysis of experimental data by using DPS data processing system, resin content had a significant impact on 2h TS.It also affected MOR, IB.But it had little effect on measured density (D), water content (W) and impact strength (IL).
Second-Order Nonlinearity of Organic/Inorganic Hybrid Materials Doped with Organic Chromophore by All-Optical Poling
Authors: Liu Yun Long , Wang Wen Jun , Wang Juan , Gao Xue Xi , Li Hui
Published: March 2011

A kind of hybrid material was synthesized via sol-gel process with PMMA and TEOS as reactants, and 4’-Iodo-4-dimethylaminoazobenzene (IDMA) as nonlinear optical organic chromophore. The second order nonlinear optical properties of hybrid material in thin films were investigated by using All-optical poling technique, and the influences of films thickness, structure and poling temperature on SHG properties were discussed. The experimental results indicated that the absorption spectrum of PMMA/SiO2/IDMA film was wider than the spectrum of PMMA/IDMA film. As a consequence of the experiment, we found that different thickness films had different SHG saturation values, there was an optimum thickness for the films. In addition, the higher the sample temperature is, the smaller the SHG intensity is. We also found that the existence of SiO2 network in the film significantly improved the azo orientation stability.
A Technology of Robot Simulation and Control
Authors: Huang Xi Guang
Published: March 2011

The internet provides a unique opportunity to remote control robots. Easy to use web interfaces enable people to control robots and to monitor their operation from the distance. This paper describes a remote control technology which combines computer network and an autonomous robot is constructed. The main feature of this technology is that users just need a general purpose computer and a world wide web browser, they can command the mobile robot in a remote location through internet.
The Study between Passive Self-Adaptability and DOF of the Rover
Authors: Yang Fei , Tao Jian Guo , Deng Zong Quan
Published: March 2011

For getting good passive self-adaptability, the model for single wheel system contacting with the terrain is established, and the degree of freedom (DOF) needed is studied when the system has good passive self-adaptability; further more, the model of one sided wheel-suspension is set up, and the DOF is obtained by analyzing with corresponding proof is given; several relative features of some common passive self-adaptive rovers are concluded, and these information testifies the universalism of this paper’s conclusions.
Bulk Metallic Glass Ti42Cu37.1Co4Zr8Sn2Ag2Be4.9 with High Glass Forming Ability and Ductility
Authors: Zhang Xin Fang , Li Hong Xiang , Jiang Zhi Qiang , Yi Seong Hoon
Published: March 2011

Bulk metallic glass Ti42Cu37.1Co4Zr8Sn2Ag2Be4.9 that can be cast into a fully amorphous rod of more than 6 mm in diameter by copper molder casting has been developed through systematic alloy design. The bulk metallic glass exhibits high fracture strength (f＝2071 MPa) and good ductility (f＝5.83％) under compression.
Design of early Warning System of Agricultural Products in the Data Warehouse
Authors: Zhou Li Juan , Li Kang , He Xiao Xu
Published: March 2011

As Chinese socialist market economy gradually has been improved, there is a lag in the agricultural production.It is a very possible research for the agricultural sector to make agricultural production policies to develop appropriate based on the government control means, consumer behavior, agricultural supply and demand balance, the outside weather conditions and other factors. In this paper, we proposed agricultural early warning system structure and function modules. It is based on the external conditions for agricultural production, agricultural consumer groups, consumer habits, especially focusing on the production and analysis module, analysis module prices and consumer modules.
Optimization Methods to Texture Synthesis
Authors: Zhao Yang , Qian Wen Hua , Chen Qiao , Chen Zhi Ming
Published: March 2011

The paper describes a framework for exemplar-based texture synthesis. The main idea is reducing synthesis time consuming and advancing synthesis quality by some optimization methods. Many optimizations such as searching along a spiral path, edge expansion, L2 distance computing predigesting, accelerate synthesis speed and the final results also advanced. Experiments show that synthesis results are quite satisfactory and effective.
Effect of Heat Leading of Windward Leading Edge Using Heat Pipe with Porous
Authors: Sun Jian , Liu Wei Qiang
Published: March 2011

By the uses of finite element method and finite volume method, we calculated the solid domain and fluid domain of windward leading edge which is flying under one condition. And the paper proved that heat pipes which covered on the leading edge have effect on thermal protection. The maximum temperature of the head decreased 12.2%. And the minimum temperature of after-body increased 8.85%. Achieving the transfer of heat from head to after-body, the front head of the thermal load was weakened and the ability of leading edge thermal protection was strengthen. The effect of the thickness of heat pipe, black level of covering materials and equivalent thermal conductivity of heat pipes on the wall temperature were discussed for the selection of thermal protection materials of windward leading edge to provide a frame of reference.
Reactive Synthesis of TiAl/Ti5Si3 In Situ Composites
Authors: Zhu Jian Feng , Yang Wen Wen , Li Shao Dan
Published: March 2011

Full dense and highly pure TiAl/Ti5Si3 in situ composite was successfully synthesized by reactive synthesis from the powder mixtures of Ti, Al and Si. The reaction process was investigated in detail by the X-ray diffraction analysis (XRD) and differential scanning calorimetry (DSC). The microstructural characteristics of the TiAl/Ti5Si3 in situ composite were also studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the as fabricated composite possesses three phases, namely, TiAl, Ti3Al and Ti5Si3. The matrix phases are mainly equiaxed TiAl with a minor lamellar Ti3Al phase. Ti5Si3 particles with size less than 1 μm are distributed uniformly in matrix grains as a reinforcing phase.
Study on the Preparation of Chitosan/PVA Sustained - Release Microspheres
Authors: Yu Jian Xiang , Shi Qi Song
Published: March 2011

Chitosan has prompted the continuous impetus for the development of safe and effective drug delivery systems because of its unique physicochemical and biological characteristics. In this study, PEG-chitosan microspheres loaded with levofloxacin for carrying drugs were prepared by the emulsion cross-linking method. The effect of drug process, the emulsifier, the amount of crosslinking agent, stirring speed, temperature, crosslinking time on the prepare experiment were studied. The effect of the quantity of chitosan and PEG, the mass ratio of chitosan and levofloxacin on the drug loading and release ability were studied in drug release experiments too.
Experimental Study on Mechanical Properties of Improved Multi-Grid Composite Wall
Authors: Li Peng Fei , Yuan Quan , Guo Meng , Yao Qian Feng
Published: March 2011

Two types of improved multi-grid composite wall called point contact multi-grid composite wall and light-steel skeleton multi-grid composite wall were proposed in this paper. In order to study the mechanical properties of improved multi-grid composite wall, the low-cycle reduplicative loading tests of 1/2 scale improved multi-grid composite wall were carried out. Through the analysis of testing phenomenon and final test results, the main failure patterns and failure processes of the walls were summarized, and the mechanical characteristics of improved multi-grid composite wall were discussed, then the seismic performance including bearing capacity, ductility, and hysteretic characteristics were researched. The experimental foundations were provided for the further theoretical research and application of improved multi-grid composite wall in practical application.
Research on the Relationship between Temperature and Dimension of Large-Scale Forgings in Manufacturing Process
Authors: Zhang Yun Cun , Yang Sha Sha , Fu Xian Bin , Qi Yan De
Published: March 2011

In order to achieve online monitoring about hot-state dimension of large-scale forgings, a new monitoring method has been developed in this paper. The large-scale barrel-type forgings heat conduction differential equation is deduced on the basis of the heat transfer. The functional form of heat conduction equation for large-scale forgings is established. Then the relationship between temperature and dimension is solved according to the variational principle. So the dimension of the large-scale forgings is monitored by combining the relationship between temperature and dimension. The temperature is measured by sensor. As a result, the online monitoring about hot-state dimension of large-scale forgings is achieved.
Study on a New Formula for Rust Remover
Authors: Wang Xiang Hong
Published: March 2011

The problem of steel products corrosion is increasingly outstanding, which causes a serious waste of resources. This thesis focuses on the study of a new formula for rust removing, adding some additives such as, corrosion inhibitor, complex agent, surfactant into the acid liquor, which is able to remove the rust layer effectively and protect metal products, economic and applicable. Through many testing on different ratio of additives composition, we obtain the optimal formula.
Study on Precipitation Behavior of High Strength Steel Plate Strengthened Complexly by Titanium and Molybdenum
Authors: Wang Hong Bin , Li Sheng Li , Li Li , Ma Peng Cheng
Published: March 2011

The precipitation behaviors of hot rolling and cold rolled annealing steel plates strengthened complexly by titanium and molybdenum were studied in the paper. The microstructures and precipitate phases were analyzed using optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) with energy disperse spectroscopy (EDS). The results showed that the coarsening square TiN phase and the fine roundness (Ti,Mo)C phase were precipitated mostly in the hot rolled steel plate. As the finishing temperature decreased and coiling holding time increased, the quantity of fine precipitates increased. And also the fine round precipitates increased, dispersion expanded and shape of the phase being uniformed as the annealing temperature increased. Therefore, the strengthen effects can be improved effectively by a reasonable control toward titanium and molybdenum precipitation behaviors.
Chloride Penetration Capacity in NPP Structures Caused by Crack
Authors: Kim Ki Beom , Kim Do Gyeum , Lee Jang Hwa
Published: March 2011

The speed of chloride penetration caused by cracking at the concrete surface is determined by the crack width. In this study, the impact of the cracks that can occur on the concrete surface (occurring from the contraction during concrete curing) on the chloride penetration speed was revealed through modeling. The accuracy of the established model was also verified through laboratory testing. The definition of the minimum crack width that affects the chloride penetration speed was established, based on testing and consideration of literature. The comparison of crack widths (20, 85, 125μm) based on the chloride profile and model prediction showed that there is virtually no chloride penetration at 20 μm, while the chloride penetration speed increased sharply at crack widths of 85 μm and 125 μm.
A New Approach in Testing and Evaluating Micro-Cracking Performance of Electroplated Diamond Film (EDF)
Authors: Wu Ying , Sun Ming Qing , Li Zhuo Qiu
Published: March 2011

Many efforts have been directed to the micro structure and performance evaluation of Electroplated Diamond Film. The indentation method has become extensively utilized in the evaluation of materials’ mechanical. Nano indentation devices, such as MTS-XP, are very useful, but on the other hand, are not affordable for many research institutions. This paper presents an effective and economic method for testing and evaluating micro-cracking performance of Electroplated Diamond Film on Instron 5848 MicroTester by considering the relative hardness values, and the need to evaluate the maximum strength for brittle materials in practical applications. The design of the test system, the evaluation methods, the test results, and the discussions are presented.
Effect of Frequency on Fatigue Cracks of Silicon Nitride Balls under Cyclic Loads
Authors: Kida Katsuyuki , Koga Junnosuke , Santos Edson Costa , Honda Takashi
Published: March 2011

In the previous work, we found that the tensile stress occurring around the equator of the ball caused fatigue of the ball itself. Four groups of pre-cracks, whose surface lengths were 140μm, 220μm, 550μm and 700μm, were initiated on ball surfaces and the strength of these pre-cracked balls was measured. The static strengths and fatigue limits of all pre-cracked balls decreased with crack sizes. We concluded that the fatigue caused by a pre-crack located on the equator of the ball surface was important for understanding fatigue of silicon nitride balls. In the present work, carrying out fatigue tests of pre-cracked balls with 220μm cracks at three frequencies (5Hz, 20Hz and 35Hz) we found that the frequency had effect on speeds of the crack growths.
Preparation and Characterization of (HAp/SiO2)/Ti Biocomposites
Authors: Zhang Xue , Xiu Zhi Meng , Li Xiao Wu
Published: March 2011

(HAp/SiO2)/Ti biocomposites were prepared by the powder metallurgy method. The phase compositions and the in vitro bioactivity of such biocomposites were systematically characterized. The XRD result shows that the phase compositions of (HAp/SiO2)/Ti composites are mainly composed of Ca4O(PO4)2 (TTCP), Ti, TiO2 and CaO. The synthesized (HAp/SiO2)/Ti biocomposites exhibit a good bioactivity, for example, after the samples are immersed in SBF solution only for 24 hours, the bone-like layer consisting of spherical apatite crystal clusters has deposited on the surface of the samples. The density and thickness of the apatite layer increases with increasing immersion time. The formation process and mechanisms of bone-like apatite layer are also discussed.
Research on Strength Calculation Model of 7A05 Aluminum Alloy Welding Heat-Affected Zone
Authors: Jiang Ke Bin , Ding Yong , Liu Ya Wen , Zheng Feng
Published: March 2011

In order to research the mechanic performance of 7A05 aluminum alloy, a series of tests, including tensile test about aluminum alloy substrate, tensile test about aluminum alloy butt welded joint, tensile test about transverse partition of aluminum alloy welded joint and hardness test were conducted. The results of these tests indicate that the strength and hardness of HAZ of this material exhibit a W-shaped reduction. There are an symmetrical softened area at 10~20mm from the center of weld. Due to ageing effect, the strength and hardness of HAZ can resume to 80%of the substrate one month after welding. Based on the analytical deduction and experimental data fitting, the theoretical strength model for HAZ of aluminum alloy is proposed. For the purpose of engineering design, the HAZ is transformed into a uniform strength reduction zone, the width and strength value is determined according to the principle of equal strength.
Optimizing of Deposition Speed of Electroless Nickel Plating Coating
Authors: Liu Guan Jun , Zhang Wen Qing , Yu Ze Tong , Ning Xin
Published: March 2011

In order to improve deposition speed of electroless nickel plating coating, composition of complex accelerating agent was optimized by orthogonal test, and SEM and its EDS was used to analyze the plating morphology. The results show that the deposition speed is increased to 27.5μm/h after 0.002g/L of cadmium sulfate, 0.05g/L of sodium dodecyl sulfate, 10g/L of malic acid and 15g/L of butanedioic acid was mixed into an electroless plating solution. The coating holds good surface quality and its phosphorus content is 14.03%, any pore was not found on the surface and decay resistance of the coating was improved.