bluuebunny/crossref_metadata_2025 huggingface dataset:
Land Use/Cover Classification over Small Areas Using Conventional Digital Camcorder Imagery Based on Frequency-Based Contextual and Neural Network Classification Techniques
Authors: Lim H.S. , Matjafri M.Z. , Abdullah K.
Published: March 2013

An airborne survey was conducted to produce land cover/use maps. The feasibility of using a conventional digital camcorder to acquire remotely sensed data was investigated, and the imagery for land cover mapping using remote sensing technique was evaluated. The study area was the Universiti Sains Malaysia campus, Penang, located in Peninsular Malaysia. Digital images were taken from a low-attitude light aircraft, Cessna 172Q, at an average altitude of 2.4384 km above sea level. The use of a digital camcorder as a sensor to capture digital images is more economical compared with other airborne sensors. This technique is designed to overcome the problem of obtaining cloud-free photographs from a satellite platform in equatorial regions. Digital video imageries were taken in the red, green, and blue bands. A comparison between frequency-based contextual and neural network classification techniques for analyzing digital camcorder imagery is presented. Frequency-based contextual and neural network classification techniques were applied to the digital camera spectral bands (red, green, and blue) to extract the thematic information from the acquired scenes. The classified map was compared with the ground truth data, and accuracy was evaluated by an error matrix. Results indicate that a conventional digital camcorder can be used to acquire digital imageries for land cover/use mapping of a small area of coverage.
A Framework for Evaluating the Performance of RFID-Enabled Supply Chain
Authors: Wang Peng , Zhu Shi Song , Wang Xiao Hua
Published: March 2013

As an automatic identification and data capture technology, RFID can greatly enhance the visibility of the supply chain and has a significant impact on its’ performance. However, because the investment of the technology is expensive and time-consuming, the application in supply chain cannot assure to make positive outputs. So it is important to fully understand the technology’s impact on the supply chain performances and take advantage of its potential benefits. For this purpose, this article analyzes and categorizes RFID’s benefits and the influence factors, and then setup a connection with supply chain performance. Subsequently, we propose a framework for evaluating the performance of RFID-enabled supply chain. Through the framework, we can comprehensively and clearly evaluate the performances of the RFID and make our decision more reasonable and suitable for the real.
Measurement of Physicochemical Property and Flavor Compounds of Hawk Tea Yogurt
Authors: Zhang Min , Ye Ming , Liu Dong , Liu Yong
Published: March 2013

Adding hawk teas (Litsea coreana L.) of 2% and 4% (W/V) to reconstituted milk, and inoculated with Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus to prepare hawk tea yogurts, named LCY1and LCY2. Compared with the control yogurt (CY), the viscosity of LCY1and LCY2respectively increased by 0.39 and 0.57, the syneresis values increased by 1.3% and 1.0%, while its water holding capacity decreased by 3.96% and 7.77% and the titratable acidity had no more changed. The sensory test revealed that the overall acceptability scores of hawk teas yogurt were quite similar to those of the control yogurt. In LCY1and LCY2, the total content of essential amino acid was remarkably higher than that of CY. There were 10-undecenal, (-)-Spathulenol, Cadina-3,9-diene and a-Cubebene detected in hawk tea yogurts, except for 20 volatile components in the CY. The numbers of S. thermophilus in LCY1and LCY2respectively increased by 0.5 and 0.52 log cfu/ml.
Simulation of the Hydrogen Permeation Behavior of X80 Pipeline Steels in H2S Saturated Environment by Cathodic-Charging Method
Authors: Huang Feng , Yuan Wei , Hu Qian , Liu Jing , Qu Yan Miao
Published: March 2013

Hydrogen-charging with various current densities was used to introduce hydrogen into X80 pipeline steel. The permeability (J∞L), the apparent diffusivity (Dapp) and the solubility of hydrogen (Capp)in X80 pipeline steels which were calculated by electrochemical hydrogen permeation curves were compared with those obtained from that of X80 pipeline steels in H2S saturated environment. Results show that in 0.5 mol/L H2SO4+ 3.1×10-3mol/L Na4P2O7(hydrogen evolution poison) solution, when hydrogen-charging current density is 30 mA/cm2, the kinetic parameters of hydrogen permeation of X80 pipeline steels agree with that of H2S saturated environment well. Another two heat-treatment specimens of X80 pipeline steel furthermore verified the reliability of the simulating results.
Hydrophilic and Photocatalytic Performances of Y-Doped Titanium Dioxide Thin Films
Authors: Du Jun , Yu Yan Bin , Huang Jing Jing , Fu Hua Qiang , Li Bu Hui , Wu Qi , Xiao Zhao Qiang , Liu Jiao , Peng Hai Long , Luo Mei , Zheng Dian Mo , Zou Jian Guo
Published: March 2013

Pure and Y-doped TiO2 thin films are prepared on glass by sol-gel method. Tetrabutyl titanate was used as Ti precursors. The chemical composition, structure and properties of TiO2 thin films are characterized by XRD, FT-IR, UV-Vis and Optical Contact Angle Measuring Instrument. Their photocatalytic performances were studied in detail by the methylene blue degradation model. The results show that the crystalline phase of Y2Ti2O7 is formed and the phase transformation from anatase to rutile is restrained when Y is doped in the TiO2 thin films. However, with the continuous increase in calcination temperature, its photocatalytic activity decreases, because the anatase will transform to the rutile. The proper amount of Y doping will cause the lattice to expand, the new defects will form and the smaller band-gap energy will be revealed. Thus, the absorption ability toward the ultraviolet can be improved, the redshift of the absorption band can also be found. As the results of it, the hydrophilicity and photocatalytic efficiency can improved. Furthermore, the photocatalytic activity increases with the hydrophilicity. When the calcination temperature of thin films is 450oC and the Y-doping is 0.3%, the main crystalline phase of the samples is the anatase, the contact angle is only 13.7o and the degradation ratio of methylene blue reached 98.84%.
Two Ruthenium Complexes with Phenanthroline Ligand for Dye-Sensitized Solar Cells
Authors: Thathong Yuranan , Wongkhan Kittiya , Jitchati Rukkiat
Published: March 2013

We report the synthetic route of two ruthenium dye-sensitizers; namely, Ru(4,4-dicarboxylic-2,2-bipyridine)(1,10-phenanthroline)(NCS)2 (6) and Ru(4,4-dicarboxylic-2,2-bipyridine)(1,10-phenanthroline-5-carboxylic acid)(NCS)2 (7), which both complexes were characterized by 1H NMR, 13C NMR and UV-Vis spectroscopic techniques.
Degradation of Porous Starch Granules and Poly(Butylene Adipate-co-Terephthalate)(PBAT) Blends: Soil Burial and Enzymatic Tests
Authors: Thothong Sirirat , Jarerat Amnat , Sriroth Klana Rong , Tantatherdtam Rattana
Published: March 2013

In order to confirm the feasibility of porous rice starch granules and PBAT blends as biodegradable composites, their degradability were carried out. Enzymatic degradability evaluation showed that α-amylase degradation of starch increased as the starch content in the blend increased. Burial test of the blends for 1-4 months was carried out and the rate of degradation of the PBAT/porous starch blend was confirmed to be slower than those of PBAT/native rice starch blend. Observation of the film blends structure by scanning electron microscope revealed that the starch was dispersed in a PBAT matrix. Furthermore, changes in the film surface after enzyme treatments were observed. The results obtained from the degradability of the porous starch granules and PBAT blends showed that this bio-composite was relatively slow, regarding as controllable degradation material.
An Investigation of Injection Times Affect on Properties of Recycled Glass Fiber Reinforced Flame Retardant PBT
Authors: Yin Yue , Zhang Shui Dong
Published: March 2013

Due to its excellent comprehensive properties, glass fiber reinforced flame retardant PBT was widely applied in electrical accessory. In this paper, the recycled glass fiber reinforced flame retardant PBT（RGFFRPBT）with injection times effect on its carboxyl content, characteristic viscosity of PBT and the average length of glass fiber were studied. The properties of RGFFRPBT PBT including mechanical, thermal and rheological properties were well investigated. The results demonstrated that when GFFRPBT was injected third time, the length of glass fiber and characteristic viscosity of PBT decreased from 895um, 0.95 to 590um, 0.52, respectively. It also indicated that the decrease trend would accelerate with higher injection times. When the injection times were twice, the notched impact strength, flexural and tensile strength of RGFFRPBT-2nd decreased to 54J/m, 128MPa and 96.1MPa, respectively. Thermal stability, maximal crystallization temperature, melting point and HDT of RGFFRPBT-2nd were not significant differed to those of GFFRPBT. When the injection times were higher than three times, all of the properties decreased drastically. With the increasing of injection times, the samples show shear-thinning and nonlinear viscoelastic properties and the shear viscosity decreased, distinctly. The results illuminated that mechanical and thermal properties of RGFFRPBT-2nd were suitable to use in the electronic and electric field.
Using DMA to Study Protection Performance of Polyurethane Foam to Underwater Blast Bubble Impulsion
Authors: Li Mao Hui , Bai Chun Hua , Shi Mei Wu , Zhou Hong
Published: March 2013

A new test method for analyzing foam protection performance to underwater explosion bubble impulsion was proposed. Applying DMA dynamic compress mode of “low frequency-high frequency-low frequency” circulation periodically, bubble impulsion of “expand-contract-expand” to objects had been simulated. Testing with this method, several kinds of low density polyurethane foam specimens with different isocyanate index were analyzed. Testing results indicate that the low density polyurethane foams with isocyanate index R equal 1.8 have much higher energy dissipation modulus and loss factor to shock periodically, and conform to the theories of molecular structure. The results show that the test method is valuable.
Effect of Surface Penetrating Sealer on the Microstructure Properties of Cement-Based Composites
Authors: Weng Tasi Lung , Lin Wei Ting
Published: March 2013

The effect of penetrating sealer on the structure of surface pore, mechanical properties, and durability of cement-based composites was studied. Concrete specimens with various water/cement ratios (w/c=0.35, 0.45, 0.55) were cast and treated surfaced with various amounts of penetrating sealer at different ages. The effect of penetrating sealer on the mechanical properties of concrete was assessed by compressive strength. And, the rapid chloride permeability was also explored to test concrete durability. Test results indicate that the application of penetrating sealer significantly improves concrete compressive strength and chloride resistance. By using scanning electron microscopes observation, the penetrating depth of penetrating sealer can be determined and is about 2 cm. The penetrating sealer in this study may be categorized as deep penetrating sealer.
Fabrication of Nano-Particle Reinforced Metal Matrix Composites
Authors: Pramanik Alokesh , Littlefair Guy
Published: March 2013

Nanoparticle reinforced metal matrix possess much better mechanical properties over microparticle reinforced metal matrix composites as well as corresponding monolithic matrix materials. However, the fabrication methods of nanoparticle reinforced metal matrix composites are complex and expensive. This paper investigates and discusses the mechanisms of all the fabrication process, such as powder metallurgy, liquid metallurgy, compocasting and hybrid methods, available in the literature. This gives an insight on challenges associated with different processes and ways to improve the fabrication processes. It is found that modified traditional fabrication processes are mainly applied for these materials. The main problem is to achieve reasonably uniform distribution of nanoparticle reinforcement in the methods other than mechanical alloying when the volume or weight percent of reinforcement is higher (> 1%).
Phenomenon of Instantaneous Work Hardening Characteristics of Sintered Cold Deformed Cu Alloy Preforms
Authors: Rajeshkannan Ananthanarayanan , Narayan S.
Published: March 2013

Work hardening behavior is an important phenomenon especially when a material is subjected to cold work. The two important parameters that expose this study are strain hardening exponent, n, and strength coefficient, K, according to ludwik equation, σ=Kε^n. In addition to strain as influencing factor for work hardening behavior, the attained density during deformation is also considered in the present investigation; a rational approach and its characteristic evaluation has been proposed. Thus a copper alloy preforms of three different aspect ratios prepared using conventional powder metallurgy method and a secondary deformation such as cold deformation were carried out till maximum density or fracture appears at the outer surface of deforming preforms. The dimensional and density measurements were carried out carefully and the same is utilized to explain the instantaneous work hardening behavior with respect to induced strain and attained density.
Synthesis and Langmuir-Blodgett Films Properties of Zn (II) Meso-Tetra (α, β, α, β-o-pivalamidophenyl) Porphyrin
Authors: Ren Yu Jie , Zha Fu De , Wang Chao Wei , Chen Qi Bin
Published: March 2013

Zn(II)meso-tetra(α,β,α,β-o-pivalamidophenyl)-porphyrin was synthesized as a sensing material. It indicated an excellent film performance and significant optical response ability, which can be used for gas detection, such as: NO2, SO2and NH3.This material was characterized by IR, NMR, and AES, and its Langmuir-Blodgett films properties were also studied by means of UV-Vis-spectroscopy. The results showed that the zinc porphyrin’s UV spectrum and LB films properties occurred a great change compared with protoporphyrin, and it also had a good film forming capability and stability.
Ductile Mode Turning of Brittle Materials and its Practical Aspects
Authors: Pramanik Alokesh , Basak Animesh
Published: March 2013

This paper aims to investigate the mechanism of ductile machining of brittle material based on information available in the literature. It also explores the challenges associated with the ductile machining of brittle materials which stop the technology from being applied in practical fields. In addition, few factors that assist to improve productivity of ductile machining of brittle material have been discussed. It is found the higher tool wear is the main obstacle of this technology. The application ofmicro-laser heating,ultrasonic vibration and coolants improve the machining time and tool life significantly.
Predicting Surface Roughness of WEDMed Wc-Co Composite Using Box-Behnken Response Surface Method
Authors: Muthuraman Veluswamy , Ramakrishnan Raju , Sundaravadivu K. , Arun B.
Published: March 2013

Wire electro discharge machining is vital to cut electrically conductive, hard, tool-die Composite materials. Optimization of WEDM involves thermo, electric, material and mechanical parameters. Achieving best possible output is one of the challenges of research and manufacturing community. Box-Behnken is a response surface methodology that can reach objective function in as few as 15 experimental runs. The present work discusses RSM as applied to wedm of tungsten carbide cobalt metal matrix composite. Selected input parameters were, on-time, off-time and wire tension. Design of experiments was used, Mathematical models were developed and the effects investigated for the response of surface roughness. Response contours been utilized to find optimum conditions and correlations developed were verified. The error established was 4.6% and a high coefficient of determination R sq (97%) promises satisfactory performance.
In Vitro Drug Release and Hemocompatibility of Biodegradable Plga/Peg Coated Paclitaxel-Eluting Stents
Authors: Pavlinich Sergey , Liu Xi Wei , Hou Li Da , Zhao Hong , Li Zhen , Li Li
Published: March 2013

The Paclitaxel-eluting stents (PTX) with biodegradable copolymer coating were studied in investigations. The polymer blend composition of PLGA (polylactic acid-co-glycolic acid) and PEG (poly ethylene glycol) have been applied as drug carrier and fabricated on the surface of 316L stainless steel stents by ultrasonic atomization spraying method. Were explored three doses: low-dose (~80μg per stent, 10 wt%), moderate-dose (~150μg per stent , 20 wt%), and high-dose (~220μg per stent , 30 wt%). The weight ratio of Paclitaxel to PLGA/PEG blends was 10:90, 20:80, and 30:70. Pre- and post-expansion surface morphologies of the Paclitaxel-eluting copolymer coating stents were examined by scanning electron microscopy (SEM). The quantitative analysis of Paclitaxel release in vitro and hemocompatibility by hemolysis ratio and dynamic clotting time measurement also were investigated.
The Research and Design of Portable ECG Acquisition Device Based on Bluetooth and 3G
Authors: Lu Dong Xin , Liu Tao
Published: March 2013

This paper describes the hardware structure framework of portable ECG acquisition device based on Bluetooth and 3G, focusing on hardware selection and various function modules design and implementation. ECG acquisition by the terminal node of the analog signal will be collected through the AD converter to a digital signal, using the Bluetooth technology to transmit the digital signal to the monitoring center, then store the ECG data at the same time analysis the ECG signal for the real-time.
Computer Aided Form Design Based on Multi-Channel Deformation Technology
Authors: Guo Lei , Ji Xiao Min , Bai Xiao Bo
Published: March 2013

This paper, proposes a method that designers provide a basic conceptual form scheme of the products with multi- deformation channel, but a detailed form is modified by the users according to the locally changeable two or three dimensional models, and the needed several product form schemes can be achieved through statistic analysis of the feedbacks from the users. In this process, users redesign the form in the mean while of product evaluation, which makes the users have a good knowledge of the products and makes the designers get the direct statistics of the most desirable morph from the perspective of the users. This method combines the evaluation and design process together, which is able to promote the batter communication, thus to make design process more efficient.
The Developments and its Applicaton Examples of Computer Simulation Code on Heat Treatment Process
Authors: Ju Dong Ying , Cao Li Ping
Published: March 2013

Strategy and function of a new developed FEM code COSMAP(COmputer Simulation of MAterial Process) for surface hardening during of thermo-mechanical processing, including heat treatment, carbonizing and nitriding and induction heat treatment, is briefly introduced in this paper. The simulation code is developed based on the metallo-thermo-mechanical theory considering the coupled equations of magnetic or electrical field, diffusion, heat conduction, inelastic stresses and kinetics of phase transformation. Some examples of simulation and the experimental verification for induction heat treatment, carbonized quenching, carbonized- nitrided-quenching process of a cylinder and ring as well as a gear are illustrated, and comparison of the simulated values of distortion, residual stresses and profile of induced phases with the experimental data is made with some discussions.
Control-Structure Integrated Design of Flexible Spacecraft Using MOEA/D
Authors: Feng Zhi Wei , Zhang Qing Bin , Tang Qian Gang
Published: March 2013

A framework has been developed to identify control-structure interaction design of flexible space structures that are Pareto optimal with respect to multiple conflicting objectives. The objectives and constraints of multiobjective optimization problem are derived from structure and control performances. The equation of motion of the flexible space structure are based on Lagrange’s equation. Multiobjective evolutionary algorithm based on decomposition (MOEA/D) is employed for optimization. This framework has been applied to a controlled idealized rotating structure to quantify tradeoffs in control-strcutrue design. The control-strcutrue design is optimized based on two conflicting objectives with minimize total mass and minimize control cost using MOEA/D. To solve the equality constraint of the above problem, an improvement is proposed in the implementation of MOEA/D. The improvement is based on the modification of new solution on each step of evolution. The numerical results obtained suggest that the MOEA/D and its improvement have the potential of practical applicability.
Study on Gasoline Engine Knock Indicators Based on Wavelet Transform and Rough Set
Authors: Wang Yan Yan , Yang Jian Guo , Ji Zhou Ying
Published: March 2013

In order to improve the knock diagnosis accuracy, knock tests were carried out on a gasoline engine, and the slight knock characteristics from vibration signals of the gasoline engine were extracted by wavelet transform method. Making use of sub-band signals which were generated by wavelet transform of vibration signals as the style signals, 23 time-domain parameters were studied by using rough set theory, and the redundant relationship of the various parameters for describing the knock characteristic was revealed. Finally, the best parameters combination of peak-to-peak value, mean amplitude and mean value was put forward as the knock indicators. The result shows that the indicators obtained by rough set theory can diagnose slight knock combustion, and the diagnostic accuracy is better than single indicator determination knock method.
Reverse Design of Non-Circular Planetary Gears Train Beating-Up Mechanism
Authors: Zhao Xiong , Yang Mao Xiang , Chen Jian Neng , Li Chuan Long , Zhu Chao Hui
Published: March 2013

A non-circular planetary gears train beating-up mechanism was proposed, the ideal kinematic curve of beating-up rockshaft was constructed and the reverse model of the pitch curve of non-circular gears was established based on the ideal kinematic curve. When the first-level non-circular gears were set as elliptical gears, the maximum swinging angle of the sley and the influence of the elliptical gears' eccentricity on the concavo-convex characteristic of the second-level non-circular gears were analyzed. Provided with a set of parameters, the pitch curves and tooth profiles of the second-level non-circular gears were determined by reverse method. The result has shown that non-circular planetary gears train beating-up mechanism can meet the requirements of beating-up process.
Analysis of Surface Scratch in Finite Line Contact EHL
Authors: Sun Hao Yang
Published: March 2013

In this paper, the phenomenon of roller scratch in Elastohydrodynamic lubrication(EHL) state is simulated successfully. A complete thermal EHL solutions of finite roller with scratch are obtained. Comparasions between current numerical film contours and Cameron’s optical interferometry graph shows satisfactory agreement. The characteristics of pressure, filmthickness as well as temperature distributions are discovered numerically. It could be concluded that surface scratch will generate a pressure increase, a high temperature and a thin film distributions on both outsides of the scratch, as well as a pressure drop, a low temperature and a thicker film distributions at the inside location of the scratch. Therefore, it will produce a local sharp maximum stress concentration and may possiblly lead to lubrication failure, which will accelerate the process of surface fatigue.
Design of Mechanism for Sieving Sweet Corn Seeds
Authors: Deng Chun Yan , Chen Fang , Deng Chen , Zhang Xiao Qin
Published: March 2013

The vibrating screen is used for sweet corn pre-processing. The machine is formed by the electric motor, the transmission system module, the sieving module as well as the rack, in total four parts. With enough tests, the machine is compact in structure and works smoothly and can avoid too much colliding. Also, it’s good at sieving and has a high efficiency and can satisfy the requirement of sieving sweet corn.
Research of Several Quantities of Mechanics
Authors: Qiu Ke , Luo Feng
Published: March 2013

This paper expresses several quantities of Mechanics that can be solved using eigen value and eigen vector of matrix in a unified expression. It revealed and discussed the mathematical nature of these quantities of Mechanics. The eigen matrix diagonalization method that can be used to easily solve all the eigen values and orthogonal eigen vectors of a matrix is given. This method is liberation from the difficulties of solving these quantities traditionally.
Vibration Modeling of Machine Tool Spindles: A Calibrated Dynamic Stiffness Matrix Method
Authors: Gaber Omar , Hashemi Seyed M.
Published: March 2013

The effects of spindles vibrational behavior on the stability lobes and the Chatter behavior of machine tools have been established. The service life has been observed to reducethe system natural frequencies. An analytical model of a multi-segment spinning spindle, based on the Dynamic Stiffness Matrix (DSM) formulation, exact within the limits of the Euler-Bernoulli beam bending theory, is developed. The system exhibits coupled Bending-Bending (B-B) vibration and its natural frequencies are found to decrease with increasing spinning speed. The bearings were included in the model usingboth rigid, simply supported, frictionless pins and flexible linear spring elements. The linear spring element stiffness is then calibrated so that the fundamental frequency of the system matches the nominal value.
Research on Shield Tunnel Three-Dimensional Modeling Method
Authors: Huang Mu , Rong Xiao Li
Published: March 2013

With the development of informational construction technology, the shield tunnel three-dimensional visualization has been more and more used. This paper proposes a modeling method of discrete space curve based on coordinates of shield line design, then calculate and generate shield tunneling model. The model data is stored in the form of triangular network. This method has fast modeling speed and low request of storage space, and is relatively easy to imply. It can be combined with GIS in fast simulation to improve work efficiency.
Design of "Software Engineering" Teaching Website
Authors: Li Yu Xiang , Liu Xin , Zhang Guang Bin , Liu Xing Shun , Gao Zhen Bo
Published: March 2013

"software engineering" is different from the general professional courses, it is born for getting rid of the software crisis and adapting to the development of software industry, it is a theory course, especially a practical course. However, due to the own characteristics of software engineering curriculum, in the daily teaching process, concerning theoretical study, students may feel boring, obtain low interest in learning and poor test results and other problems. ASPNET design technique is adopted and Access 2007 database is used for system to design and realize "Software Engineering" teaching website. System features mainly include theoretical teaching, case teaching, practical teaching, teaching interaction, database, test item bank, announcement, etc., which can enhance the vitality, interest and dynamic role of learning.
Study of Friction and Wear Behavior of Overbased Calcium Sulfonate Complex Grease Containing Anti-Oxidant Additives
Authors: Hou Chong , Xia Yan Qiu , Ge Xiang Yu
Published: March 2013

The fiction and wear properties of overbased calcium sulfonate complex grease containing anti-oxidant additives were investigated using MFT-R 4000 reciprocating friction and wear tester.The results show that the overbased calcium sulfonate complex greasecontaining 2%dialkylated diphenylamine (L57) having better friction-reducing properties than the grease containing 2,6-di-tert-butyl-phenol (L135) and the grease containing 5% L57.
Morphology and Mechanical Properties of the Polyurethane/PANI-DBSA Blend Nanofibers by the Electrospinning Technique
Authors: Wang Xiu Lian , Zhang Liu Xue
Published: March 2013

In this study, composite nanofibers of polyaniline doped with dodecylbenzene sulfonic acid (PANI-DBSA) and polyurethane (PU) were prepared via an electrospinning process. The morphology, diameter, and structure of the electrospun nanofibers were investigated. SEM images showed that the morphology and diameter of the nanofibers were mainly affected by the weight ratio of the blend. The average diameter of the nanofibers was 370–1620 nm. The diameter gradually decreased with increasing PANI-DBSA content in the blend, and more beads were obtained in the composite.
650nm Plastic Optical Fiber Transmission System
Authors: Miao De Jun , Dai Yi Zong
Published: March 2013

The 650nm plastic optical fiber transmission system includes 650nm optical Ethernet switch, 650nm optical network card, 650nm optical wavelength converter, 650nm photoelectric converter and 650nm optical repeater. Polymer optical fiber is used as transmission medium, the use of photoelectric technology, network technology, embedded chip and software technology, and system integration. The system can replace the existing twisted-pair copper wire LAN system.
Matched Field Processing Based on the Simulated Annealing
Authors: Wang Qi , Wang Ying Min , Gou Yan Ni
Published: March 2013

The matched field processing (MFP) for localization usually needs to match all the replica fields in the observation sea with the received fields, and then find the maximum peaks in the matched results, so how to find the maximum in the results effectively and quickly is a problem. As known the classical simulated annealing (CSA) which has the global optimization capability is used widely for combinatorial optimization problems. For passive localization the position of the source can be recognized as a combinatorial optimization problem about range and depth, so a new matched field processing based on CSA is proposed. In order to evaluate the performance of this method, the normal mode was used to calculate the replica field. Finally the algorithm was evaluated by the dataset in the Mediterranean Sea in 1994. Comparing to the conventional matched field passive localization (CMFP), it can be conclude that the new one can localize optimum peak successfully where the output power of CMFP is maximum, meanwhile it is faster than CMFP.
The Research of Aircraft Landing Problems Based on Neural Network
Authors: Chen Ming Qiang , Zhang Guang Ming , Feng Jun Hong
Published: March 2013

Aircraft Landing Scheduling (ALS) problem is a typical hard multi-constraint optimization problem. In real applications, it is not most important to find the best solution but to provide a feasible landing schedule in an acceptable time. Scheduling aircraft landing is a complex task encountered by most of the control towers. In this paper, we study the aircraft landing problem (ALP) in the multiple runway case. This paper proposes a method based on neural network which can effectively solve the ALS while satisfying the real-time need.
Research and Design for Image Search Engine
Authors: Qiu Ling , Wei Zheng Xi
Published: March 2013

Content-based image search is an urgent problem as the next generation of search engines. This paper firstly analyzes and discusses its main features and key techniques, and then presents a designs method of image search engine based on image content. Next, we give a detailed elaboration about the main function modules and introduce the testing process. By using data filtering technology and ELFHash algorithms, the search time-consume is less than 1 second. The testing results finally prove the overall performance of our image search engine is excellent and achieves the desired design requirements.
Effects of Alloy Composition and Annealing Treatment on the Performance of Aluminum Conductor
Authors: Chen Wen Ping , Su Yong , Hu Ping , Jiang Yan
Published: March 2013

Discuss how iron, copper and magnesium alloy and rare earth cerium influence the electrical and mechanical properties of aluminum conductor using the orthogonal test, to thereby get the best alloy composition that meets the requirement; through test analysis on the conductivity, intensity and elongation at break of aluminum conductor with the best alloy composition, discuss the influence of different annealing temperature and holding time on their performance. The results show that: the best material composition of the aluminum alloy conductor would be 0.25% Fe, 0.40% Cu, 0.05% Mg, 0.30% Ce, 0.008% B, and aluminum and inevitable impurities. The intensity, elongation at break and conductivity of this aluminum conductor would be 110N/mm2, 30.0% and 62.2%IACS respectively. The best annealing process parameters are annealing temperature of 310°C, and holding time for 30min, direct air cool. The intensity of aluminum conductor processed is 129 N/mm2, and the elongation at break, resistivity, and conductivity are 15.0%, 2.782×10-8Ω•m and 62%IACS respectively. The mechanical properties and conductivity of this aluminum conductor both comply with the requirements of wire and cable conductor cores.
Effects of Si, Cu and Mg on the High-Temperature Mechanical Properties of Al-Si-Cu-Mg Alloy
Authors: Zhang Wen Da , Yang Jing , Dang Jing Zhi , Liu Yun , Xu Hong
Published: March 2013

The regression equation of the relationship between Si, Cu and Mg and the mechanical properties of Al-Si-Cu-Mg alloy was established according to the orthogonal experimental results. The microstructure of the Al-Si-Cu-Mg alloy was analyzed with scanning electron microscopy and energy dispersive spectroscopy. The results show that Si, Cu and Mg affected the mechanical properties (tensile strength and elongation rate) at 250 °C most significantly, minimally and negatively, respectively. The interactions between Cu, Mg and Si greatly reduced the high-temperature tensile strength owing to the formation of brittle and hard intermetallic Al5Mg8Cu2Si6 that behaved as the initial crack during stretching.
Effect of Heat Treatment on Microstructure and Mechanical Properties of A390 Alloy
Authors: Li Bao , Zhang Zhi Feng , Wang Zhi Gang , Xu Jun , Zhu Qiang
Published: March 2013

In the present work, the effects of heat treatment on microstructure and mechanical properties of A390 alloy were investigated. The results show that the as-cast microstructure of A390 alloy mainly consists of primary silicon, α-Al, eutectic silicon and Al2Cu phase. The morphology of primary silicon is irregular polygonal block with sharp edges. Eutectic silicon exhibits a coarse plate-like and acicular morphology and the fishbone like Al2Cu phases are gathered at the grain boundary. During solution treatment, eutectic silicon undergoes fragmentation and spheroidization and T6 heat treatment has a profound effect on the dissolution of Cu and Mg. However, the morphology and size of primary silicon changes little. After the aging process, Al2Cu phases are precipited as lamellar morphology. As a result, the mechanical properties the heat treated A390 alloy increases signiﬁcantly after T6 treatment.
Effects of High Co Contents in Fe-Cr-Mo-C-B-Y Alloy on the Glass Forming and the Mechanical Properties
Authors: Chen Qing Jun , Liu Jiang Lie , Zhou Xian Liang , Shen Jun , Hua Xiao Zhen
Published: March 2013

A series of wedge shape Fe24+XCo24-XCr15Mo14C15B6Y2 (x=0,2,4,6,8) samples were prepared by copper mold suction casting method. The effects of high Co contents on glass forming ability (GFA) and mechanical properties of Fe24+XCo24-X Cr15Mo14C15B6Y2 bulk metallic glasses (BMG) were investigated, respectively. The glass forming ability of bulk amorphous Fe24+XCo24-XCr15Mo14C15B6Y2 (x=0,2,4,6,8) and Fe41Co7Cr15Mo14C15B6Y2 alloys have been researched. Simultaneously, the thermal conductivity parameters of those alloys were tested. The maximum thickness of amorphous region of wedge-shaped samples are dm =7.80 mm for Fe28Co20Cr15Mo14C15B6Y2, dm =7.10 mm for Fe41Co7Cr15Mo14C15B6Y2 and the thermal conductivity are λ=7.11 w.m-1.k-1 and 7.19 w.m-1.k-1, the thermal diffusivity are α=1.875 mm2/s and 1.905 mm2/s for Fe28Co20Cr15Mo14C15B6Y2 and Fe41Co7Cr15Mo14C15B6Y2 BMGs, respectively. The glass forming ability of Fe28Co20Cr15Mo14C15B6Y2 alloy is bigger than that of well known Fe41Co7Cr15Mo14C15B6Y2 alloy. With the change of Co content, the Vickers hardness of Fe24+XCo24-XCr15Mo14C15B6Y2 (x=0,2,4,6,8) change from 1292 to 1322Hv.
In Situ Study of Stress-Induced Martensitic Transformation in Ni47Ti44Nb9 Shape-Memory Alloys
Authors: Liu Hong Tao , Sun Guang Ai , Wang Yan Dong , Chen Bo , Wang Xiao Lin , Tian Qiang
Published: March 2013

The stress-induced martensitic transformation in Ni47Ti44Nb9 was examined using X-ray diffraction (XRD) during in situ uniaxial loading and unloading. A new martensitic (020) peak in XRD patterns is observed under strain from 10% to 12%. It indicates that the martensitic texture has reached the optimum orientation. After unloading, approximately 8% irreversible strain still remains. It is associated with the reorientation of martensites and the plastic deformation of the B2-phase. In addition, the deformed β-Nb particles would also reduce the driving force for the reverse transformation. The details of lattice-strain and shared applied stress (SAS) in the B2-phase and β-Nb phase are also discussed in this work.
Effects of PP-G-MA and Epoxy Resin on Morphology and Mechanical Properties of the PP/LGF Composites
Authors: Zhang Kai Zhou , Guo Qiang , Guo Jian Bing , Zhang Dao Hai
Published: March 2013

The effects of polypropylene grafted with maleic anhydride (PP-g-MA) and epoxy resin (ER) on the interfacial interaction of the long glass fiber reinforced PP composites were investigated by means of scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and mechanical properties. The experimental results demonstrate that PP-g-MA and ER could effectively improve interfacial interaction between the PP and LGF. Based on SEM, good interfacial adhesion between PP and LGF in PP/ PP-g-MA/ER/LGF composite was observed. DSC results showed that the existense of PP-g-MA or ER caused crystallization temperature shift to low temperature, and melting temperature shift to high temperature. All results in this paper were consistent, and showed the good interaction between PP and LGF, which were proved by the mechanical properties of the composites.
Eutectoid Transformation in Zn Alloy with High Al Content
Authors: Wang You Bin , Zeng Jian Min
Published: March 2013

Solid-state phase transformation has an important influence on mechanical property of Zn alloy with high Al content. The dynamic microstructure evolution of eutectoid transformation for the Zn alloy with high Al content was observed by high temperature metallography microscope. The phase of the Zn alloy with high aluminum at 300°C was analyzed by the high temperature X-ray diffractograms. The results show that eutectoid transformation originates in the grain boundary and develops rapidly as the heating temperature rises.The variation of eutectoid transformation completion with the time increasing in the dynamics process can be expressed by M=100(1-e-0.0023t1.3137)
The Effect of Aging on the Corrosion Property of Al-7Si-0.3Mg
Authors: Wang You Bin , Zeng Jian Min
Published: March 2013

The effect of aging on the corrosion property of Al-7Si-0.3Mg Alloy immersed in 3.5% NaCl solution was studied by Tafel polarization curves and corrosion weight loss measurement in this paper. The Vickers hardness of the alloy during aging was measured on Zwick hardness testing machine. The electrochemical behavior of the Al-7Si-0.3Mg alloys after the under aged, peak aged and over aged were analyzed, respectively. The results show that the hardness of the alloy increases at first with the increasing of aging time and gets to the maximum at 4 hour, and descends gradually with the aging time (over aged). Icorr under peak aged status get to the highest value and to the lowest one during under aged status. Correspondingly, corrosion properties under peak aged status are the worst case and the best with under aged status.
Study on Properties of Epoxy Resin /Al2O3 Composites
Authors: Zhao Yong Jiu , Huang Xin Min , Dai Rong Rong , Zhang Wei , Wu Yu Cheng , Shu Xia , Xu Pei
Published: March 2013

An epoxy resin/Al2O3 composite was prepared via a new type of process.The effects of Al2O3 content on the mechanical properties and thermal conductivity of the composite were investigated.It shows that the thermal conductivity of the epoxy resin/Al2O3 composite aggrandizes with the addition of aluminum oxide.As the content of Al2O3 is 30%,the thermal conductivity coefficient reaches 0.46W/m·K. Al2O3 particles can hinder the propagation of flaw or make crack change direction.and lead to generate scales flake and islands peak shape on the fracture surface when The thetensile fracture surfaces tested under the liquid nitrogen temperatures(77k). When the mass fraction of Al2O3 is 20%, the mechanics properties of the composite is better
Research on Reinforced Concrete Column under High Speed Impact of Different Diameter Projectile
Authors: Gao Fei , Tao Jun Lin
Published: March 2013

In order to study the dynamic response of the reinforced concrete column which is under the high speed impact of different diameter projectile, LS-DYNA finite element calculation software was used to, designing four kinds of solutions, calculate and analyse the reinforced concrete column under the situations. Projectile velocity curve、projectile acceleration curve and the results of reinforced concrete column damage of different α value(the ratio of projectile diameter and reinforced concrete column side length) in the conditions of the same impact parts(1/2 of the column high) and initial velocity(800m/s)were obtained. Based on the analysis of the numerical simulation results, we get the influence rule of the dynamic response of reinforced concrete column which is under the impact of different diameter projectile.
Research on Porous Properties of Air-Entrained Lightweight Aggregate Concrete
Authors: Hu Wei Xin , Abudula Abulitipu.
Published: March 2013

Lightweight aggregate concrete with bleed air : the air-entraining agent added to the lightweight aggregate concrete , cement paste to form the porous structure of the porous structure of the right amount of artificial lightweight aggregate concrete . Reduce the density of the concrete to improve the insulation properties of the concrete . Applied to structural insulation concrete strength than 20Mpa, the thermal conductivity is less than 0.36W / ( m • K) . Of lightweight aggregate structure insulation concrete materials properties and microstructure of variation with air entraining agent .
Study on BFRP Constrained Preloaded Concrete Square-Shaped Column
Authors: Li Su Juan
Published: March 2013

It was proceeded to the specimen without load in the former research of FRP constraint concrete. And this was not conformed to the reality of unload of the structure member when reinforcing. So that, this paper carried on the test research of BFRP constraint concrete square column. During the test, the deformation and the load random were recorded. Disposing the data, many stress-strain curves were plotted. Analyzing the curves, it was found that: BFRP can enhance the concrete obviously. At the same time, the effect of axial compression ratio preloaded to reinforcement was analyzed in the paper.
Design a Thermosetting Asphalt Mixture for Surfacing on Orthotropic Steel Deck Bridge
Authors: Chen Chun , Qian Zhen Dong , Wang Yong Quan
Published: March 2013

According to Superpave mix design method, a thermosetting material (Epoxy Asphalt mixture) was designed for surfacing on orthotropic steel deck bridge. Firstly, based on the thermosetting feature, the viscosity increasing law of EA binder was studied by Brookfield test. Then, some characteristic indexes of EA mixture, such as the prior mixing time and the reserved time, were determined according to the viscosity increasing law and recommended viscosity range for mixing and compaction. Finally, using these characteristic indexes, an EA mixture with 3.0% air voids was designed by volumetric mixture design procedure of Superpave method. The results show: 1) different from other asphalt mixtures, the characteristic indexes of end mixing time and reserved time should be applied in EA mixture design because of the thermosetting character of EA binder; 2) the EA mixture designed by Superpave method in this paper has a higher EA binder content than that designed by conventional Marshall method.
Synergistic Effects and Cracking Bending Strength for Steel-Polypropylene Hybrid Fiber Reinforced Concrete
Authors: Mei Guo Dong , Liu Xiao Fan , Li Ji Xiang , Duan Wen Fu
Published: March 2013

The cracking bending strength for steel-polypropylene hybrid fiber reinforced concrete (HFRC) had been studied based on experimental test. the inicial cracking strength achieve significant improvement compare to plain concrete, and the highest increase is 16.7%. There is a synergistic effect exist when steel fiber is 1.0% in volume or polypropylene fiber is 0.1% in volume, and the synergistic effect raise to vertex (1.043) when both of those two requirements are fulfilled.
Research Status on Fatigue Behavior of Reinforced Concrete Beams Strengthened with Fiber Reinforced Polymers
Authors: Liu Yi Feng , Guo Yong Chang , Zhang Jian Hong
Published: March 2013

Due to excellent mechanical properties and high working efficiency, FRP sheet has attracted significant attention from the field of strengthening in civil engineering. This paper summarizes the current achievements in the FRP strengthened reinforced concrete beams under fatigue loading. The review and discussion focuses on the development of fatigue design, the fatigue failure mechanism, reinforcement methods,and environmental effects. Finally, it puts forward the main research directions in this field in the future.
Epoxy Resin (EP) / Nano-SiO2 Composite Material Preparation by Two Processes
Authors: Zhao Ying Na , Zeng Xiong Feng , Zhang Wen Li
Published: March 2013

Ultrasonic wave (UW) and sol-gel (SG) technology were using to preprocess the nano-SiO2, and the SiO2/EP composites were prepared by adding coupling agent KH-550, curing agent T-31 and different contents SiO2 into EP matrix. Using infrared spectra analysis tested the samples’ structures and the thermal stability of two preparation processes were tested by TG. The results indicated that, the thermal stability of the SiO2/EP composites by UW preprocess was improved about 25 oC -60 oC when compared with pure EP and the SiO2/EP composites by SG. Comparing to the comprehensive evaluation of thermal stability of different SiO2 contents SiO2/EP composites, the most optimum additive of nano-SiO2 was about 10 wt. % by UW process.
Testing and Evaluation of Comfort Performances of Mongolian Clothing Fabrics
Authors: Guo Xiao Fang , Liu Wen Juan , Wei Cheng Long
Published: March 2013

To improve the comfort performances of Mongolian clothing, five Mongolian clothing fabrics were selected. According to the natural environments of Mongolian Plateau in China, their structure parameters and comfort performances were analysed. The most primary characteristics of Mongolian clothing fabrics were concluded in this research, which must be valuable to the evironment adaptability research of human to Mongolian Plateau.