bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Biaxial Pre-Stretching on Microstructures and Mechanical Properties of 2024 Aluminum Alloy Thin Plates
Authors: Wu Jian Jun , Guo Rui Chao , Li Hao , Zhang Shen
Published: January 2014

Biaxial pre-stretching is implemented by bulge forming model. After engraved circular grids on new quenching blank, the specimen is biaxially pre-stretching formed. We use JGX-2 Engineering Microscope to measure principal pre-stretching points with 1.5%-3.1% elongation, which are in plane strain state. Hardness is measured by GYZJ 934-1 type Barcol Hardness and microstructures are observed by JEM-200CX Transmission Electron Microscope. The result shows that the influence on tensile strength of biaxial pre-stretching for new quenching state specimen is not big; however, it is the principal pre-stretching quantity 1.75% that improves microstructure and hardness.
Study on the Creep Properties of Resin Concrete
Authors: Shen Hui Cun , Tian Kui , Hu Yan Hua
Published: January 2014

Resin concrete is a new material which can be made into machine bed instead of the traditional pieces of gray cast iron as the machine base, it can improve the dynamic stiffness of machine tools and the quality of machined parts, and extend the campaign life, reduce noise and improve efficiency. However, due to the long-term effect of load of the resin concrete, the elastic deformation occurs in its component, and the strain will increase over time. Thus it can affect the resin concretes service life, and the calculation of creep has become an urgent task in structure design and use, which should be taken seriously. In this paper, the bending creep properties of resin concrete beam were studied and analyzed by using four-point bending test method. The creep curve under different load levels were obtained, and the viscoelastic properties were analyzed.
A Hydrothermal Factor Calculating Approach Based on FEM for Fiber-Reinforced Composites
Authors: Zhang Ye , Zheng Xi Tao , Yang Jie , Wang Bin Tuan
Published: January 2014

The wide range of applications of fiber-reinforced composites in numbers of engineering fields is demanding better understanding on its hydrothermal properties. Especially for those are applied under complex hydrothermal environment such as aircraft industry. However, most methods we used at the present are either complicated or demand high-cost. In this paper, a novel approach based on finite element method (FEM) is proposed to calculate the hydrothermal factor by supposing an original decrease in the laminates stiffness. The integrated strains, consisting of Room Temperature Dry (RTD) strain and FEM simulated strain with the Elevated Temperature Wet (ETW) strain, are used to make an estimate for the hydrothermal factor. Hence, this FEM approach with low cost can be used to calculate the hydrothermal factor without doing full-scale structural ETW experiments. Compared with experimental results of the notched compression and single-bolted joints, it can be concluded that the approach introduced in the present paper can predict excellently the determination scope of the hydrothermal factor reasonably even in structural scale.
New Approach to Synthesis of CuO/CeO2 Catalysts for Preferential CO Oxidation
Authors: Wang Shu Hua , Xu Li , Shen Pan , Chen Chao , Zhang Ning
Published: January 2014

Employing Metalorganic frameworks (MOFs) as precursor, a series of CuO/CeO2 catalysts with welldispersed copper species were synthesized and applied for preferential CO oxidation in H2rich stream. The high activity of the CuO/CeO2 catalysts indicated that MOFs precursor played a key role in improving the dispersion of metal active sites.
Finite Element Method Analysis for Marine Semi-Built-Up Crankshaft Shrinkage Fitting
Authors: Cao Shou Qi , Fu Shu Man , Zhu Ya Wen , Han Yan Ling
Published: January 2014

Based on the theories of induction heating and thermal conductivity, and by establishing a three-dimensional finite element analysis model including the induction coil, crank cheek and air, the pattern of temperatures field distribution and thermal deformation condition of the crank cheek during the period of induction heating were numerically simulated with software ANSYS. The simulation result showed that, by setting a circular coil inside the crank cheek, a uniform temperatures field around the hole would be obtained after a certain period of induction heating. As a result, the crankshaft would reach a high quality shrinkage fitting, manifesting the feasibility of the application of induction heating to the crankshaft shrinkage fitting.
The Applications of Mold Flow Analysis on Vibration Separation Technologies of Investment Casting Components
Authors: Huang Pei Hsing , Chen Yu Ting
Published: January 2014

Conventionally, the investment casting components were separated from the casting pattern tree via a grinding machine to cut off ingate/inlet of the gating system. This post-treatment process may considerably increase labor and material costs. In this paper, a fatigue damage technology was proposed to separate the components in substitution for the cutting operation of traditional grinding machines. Mold flow analyses were conducted in the design of the gating system to ensure the casting quality. An actual vibration experiment of the casting pattern tree was conducted, and the results verified that the substitutive scheme is feasible.
Effect of the Sheet Thickness on the Electrochemical Performance of 2-D SnO2 Nanomaterial as Li Ion Battery Anode Material
Authors: Wei Wei , Huang Wei Feng , Yang Zhao , Guo Lin , Wu Zi Yu
Published: January 2014

2-D SnO2 nanosheets with controllable thickness have been synthesized via a simple hydrothermal method. Characterization shows that the sheet thickness can be controlled from 3 to 30 nm. The correlation between the sheet thickness and the electrochemical performance of these samples as anode materials for Li ion batteries were investigated, it was found that when the sheet thickness less than 10 nm, electrodes with high charge/discharge capacities, coulombic efficiencies and stable cycling performance could be realized. The good electrochemical performance are ascribe to the ultra thin nanosheet, good flexility and porous structure of the SnO2 anode material.
Fabrication High Aspect Ratio Nanometer Holes on the Alumina Based on Self-Organization Technology
Authors: Li Yi Gui , Li Ling Han , Sugiyama Susumu , Liu Jing Quan
Published: January 2014

In this paper, a nanofabrication technology of alumina self-organization method for deep and self-arranged nanometer holes on high purity aluminum is presented. Deep and self-arranged nanometer holes can be used as antireflection structures, polarizing elements, guided-mode resonance filters and high efficiency diffraction optical elements. The fabrication technology provided an effective method for low-cost, large-scale manufacturing high aspect ratio nanoholes.The deep nanoholes structure is fabricated by two anodizing processes on aluminum. The theoretical calculation of reflectivity for the fabricated deep holes G-solver sofeware while the measurement setup for the reflectivity of the deep nanoholes is self-made optical parameter test system.The results show that the calculated reflectivity of the deep holes is below 8.0% within the visible wavelength range, while the measured reflectivity of the fabricated nanometer holes is under 8.30% within the wavelength range of 400-760nm and it agrees well with the theoretical analysis result.
One Step Growth of Semiconductor CdS Uniform Branched Nanowire on FTO
Authors: Lu Yi Ren , Ling T. , Du X.W. , Yin P.F. , Zhang H. , Chen X.Y.
Published: January 2014

Recentaly, semiconductor nanowires (NWs) exhibit unique electrical, optical, and mechanical properties. Single crystalline CdS uniform branched Nanowire was synthesized by a simple, template-free, low-temperature synthesis of CdS uniform branched Nanowires with the hexagonal wurtzite phase from powder CdS under chemical vapor deposition (CVD) technique is demonstrated. It is shown through extensive spectroscopic and structural characterization that the nanostructures we prepared was branched morphology. X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM) used to study the crystalline structure, composition and morphology of different samples results for this series of Bi2S3 seeds reveal major reaction consequences. Vaporliquidsolid (VLS) processes were proposed for the growth of the CdS uniform branched Nanowire. The results presented here presented the capacity to engineer nanowire p-n junctions exchange interactions via this strategies.
Keywords:nanowire,Semiconductor,CVD
A Review on Biodiesel Production: Breeding Technologies of Microalgae Containing Rich Lipid
Authors: Ma Chao , Liu Bing Feng , Ren Hong Yu , Ren Nan Qi
Published: January 2014

Among different biodiesel production technologies, microalgae biodiesel production has exhibited largest potential as an substitute of fossil fuels. Microalgae are effective photosynthetic microorganisms and ideal materials for biodiesel production because they have many advantages, such as the high lipid content, fast growth rate and good adaptability. Most key factor for the industrialization of microalgae biodiesel production is selecting the microalgae with rich lipid, which determines the production cost of microalgae biodiesel. The different breeding technologies of microalgae can significantly shorten the breeding time, reduce the production cost and obtain expected strains. The prospect of microalgael application in biodiesel production was also discussed.
The Changes of Ultrastructure and Proteome Induced by Repeated Eccentric Exercise on of Rat Skeletal Muscle
Authors: Dong Gui Jun , Lv Chen Xi , Li Ke Feng
Published: January 2014

To research ultrastructure changes of rat skeletal muscle in the process of repetition eccentric exercise, Wistar rats were divided into normal control group, one eccentric exercise group, repeated eccentric exercise group. The ultrastructure and proteome changes made by downhill run and repetitive downhill run after a week in rats were observed in instant, 24h, 48h, 72h and 168h after one and repeated bout of exercise rats. The results showed that the most serious injuries of sarcomere in 48 hours after exercise, sarcomere disordered or disappeared, Z-line fractured and myofilament decomposed. From 24h to 48h, mitochondria was severely damaged, which structure gradually restored within 72 hours, the muscle fiber reconstructed, but mitochondrial number, structure and function had not yet been fully restored, the muscle cells in aerobic capacity have not yet fully been restored. At the same time, the injury severity of repeated exercise group was palliative compared to that of the first exercise, which may be related to recovery rate of mitochondrial damage. Therefore, repetitive motion can change the mitochondria's own repair speed, stimulate muscle to adapt the density of exercise, and reduce the extent of skeletal muscle micro-injury. Repeated eccentric exercise may promote key enzyme expression of energy metabolism and energy supply for damage cell, accelerate skeletal muscle contraction protein degradation and cell swallow, and scavenge free radicals and slow inflammatory reaction during 24-48h to speed up the skeletal muscle damage repair.
Keywords: Eccentric Exercise, Repetitive Exercise, Skeletal Muscle, Ultrastructure, Peoteome
Modeling and Dynamic Research of the Pneumatic-Hydraulic Loading Simulator System
Authors: Wang Hong Yan , Lu Jin Bo , Dai Xing , Wang Rong
Published: January 2014

This paper presents the Pneumatic-Hydraulic Loading Simulator System, which structure is new in loading simulator systems. The design of this system takes into account that the gas has greater compressibility, which can effectively reduce the extraneous torque of loading simulator, and the liquid can provide the appropriate damping, which can improve the stability and precision of system. The model of the system is established in this paper, and to make sure that the structure of the system is realizable, the dynamical simulation research is carried out.
Influence of Acute Incremental Exercise on Antioxidation-Endocrine-Immune Network of PM2.5 Exposed Rats
Authors: Li Feng , Shi Hui
Published: January 2014

The paper is to study the mechanism of antioxidation-endocrine-immune network through exercise with rice after PM2.5 been exposed. The 40 male Wistar SPF rats were randomly divided into the QC, EC, LPE, MPE, HPE. the serum GSTs, T-AOC, GSH-Px, NE, T, C, FT, TNF-α, IL-1β were tested.The results showed that the activity of GST, C, NE, IL-1β have upward trend but the T-AOC, GSH-Px and T declined compared with the QC; compared with the EC group, all PM2.5 exposed+exerxise have the same upward oe downward trend compared with EC. Conclusion: PM2.5 exposure can destroy the antioxidant and immune defence, it has dose-response ralationships with the PM2.5 doses concentration; the negtive influence of PM2.5 to antioxidation-endocrine-immune network may be one of the mechanism of sports ability decline in the air pollution environment.
A Selection Optimization Model of Water Pollution Emission Reduction Measures in Refining and Chemical Enterprises
Authors: Li Xing Chun , Wen Jing Ya , Long Jiang , Du Xian Yuan , Li Yu
Published: January 2014

On account of severe water pollution condition, this paper combines refinery and chemical enterprises pollution reduction and linear programming method, builds a selection optimization model of water pollution emission reduction measures in refining and chemical enterprises, and puts the above model into practice to validate its validity and reliability. According to the case study, the maximum emission reductions of COD and NH3-N for refining and chemical enterprises was 6481.50 and 549.51tons, which has improved 29.63% and 9.90% compared with the target reductions, respectively. The optimal emission reduction scheme is choosing MycelxTM technology, and COD has installed on the Delay catalytic unit, while NH3-N has installed on the Sulfur recovery unit. This model could provide not only the maximum emission reduction and optimal scheme, but also the decision support of emission reduction for refinery and chemical enterprises during "the 12th Five-Year Plan".
Present Status of Damping Test Techniques for Magnesium Alloys
Authors: Tian Tie , Mao Xing Zi , Mi Lin
Published: January 2014

The present situation of damping capacity for magnesium alloys test techniques and its equipment were reviewed. Because there were many types of test equipment, So it pointed out the suitability of all testing equipment and schemes for damping testing of magnesium alloys. And based on the research results of dislocation damping mechanism of magnesium alloys. The author holds that test scheme for torsional deformation of torsion pendulum and test scheme for bending and shearing deformation of dynamic thermal mechanical analyzer meet high-precision test requirements for non-linear damping capacity of magnesium alloys. The study make great value for testing damping of magnesium alloys and reflecting their damping advantage.
Development Process of a Method, Material and Evaluation for Professional Qualification of Employees with Disabilities
Authors: Miyake Okumura Maria Lucia , Canciglieri Junior Osiris , de Souza Teófilo Miguel
Published: January 2014

This paper presents a case study regarding the professional qualification training for a group of disabled employees newly hired by a company that manufactures automotive parts. These employees receive exclusive training to work on the companys plant floor. This research was limited to PCP (Planning and Production Control) classes, where was used the courseware, teaching methodology and student-employee assessment outlined in the structure of Product Development Process oriented for Assistive Technology. The main challenge was planning the training for a group of students that present physical, mental, visual or hearing disabilities. The research objective is to present the research conducted in the class and the possibility of development of teaching methods and materials that reach the cognition level of students with disabilities in the PCP subject, making them aware of the necessity of teamwork and consequently enabling them to perform their function as well as raise awareness for searching improvements in the work environment and alternatives communication with their coworkers. At the end, it is discussed the results presenting the strengths and difficulties found during the research in the professional qualification training classes.
The Development of Excelle Lighting and Signal Test Rig
Authors: Zheng Xi Wei
Published: January 2014

The lighting and signaling system test rig of the GM Excelle is selected to develop lighting rig, and is designed according to the circuit diagram of the system real cars and real cars positions. This rig have a system diagram, the fault controller, fault detection interface. In actual use, a single fault type can be set, and multiple fault types can be set, too. Failure points of each fault type can also be arbitrarily set according to the situation of the student grasping, which is more conducive to cultivating diagnostic ideas of the students and improving their troubleshooting ability. It is an economical, practical and efficient experimental teaching equipment.
Determine the Geometry of Tip in Humidity-Dependent Adhesion Force Measurements with Atomic Force Microscope
Authors: Yang Li , Qin Jian , Zhao Bai Ke
Published: January 2014

The changes of the tip geometry due to the tip wear can completely alter the variation of the adhesion force dependence on the humidity. In this paper, we propose a simple method to calculate the width of tip wear using the adhesion force at inflection point of the experimental adhesion force versus humidity curves. Theoretical results show that the turning point of the adhesion versus humidity curve is closely correlated with the width of the worn tip, which can be precise calculated. The validity of the proposed method is proved by the agreement of our calculate results and the existing experimental data.
Residents Safe Hidden Trouble Existing in the Construction and Construction Safety Management
Authors: Dong Xiao Lin
Published: January 2014

the guideline of \"safety first, prevention first\" is our predecessors with blood bring enlightenment to us, we must pay attention to. But now in the construction of residential buildings is to affect the construction safety risk, this paper is based on the analysis of potential safety problems, and further puts forward relevant measures, for your reference.
Volatile Organic Compounds in Melon Seeds Plastic Bags
Authors: Li Xie , Jia Da Peng , Ci Ji Hao , Zhang Qian
Published: January 2014

Eight volatile organic compounds (VOCs) in melon seeds printing and packaging materials have been analyzed by a headspace gas chromatography and mass spectrometry method. The results of external standard method show that PET and aluminum foil as raw materials of melon seeds plastic bags contain less VOCs, but PE contains much more VOCs. There are more VOCs in printing inks. Red ink has the most amount of VOCs (2777.27 mg/kg). The binder contains 143.574 mg/kg of VOCs. PE and printing inks may be the main sources of VOCs in the melon seeds plastic bags. Residues of benzenes in the front plastic bag materials exceed national standards. The amount of VOCs and benzenes in the back plastic bag materials all exceed national standards.
Investigation on Melting Phenomena Generated during Dynamic Formation of Al-Based Coating on Magnesium Alloy
Authors: Wang Xiao Ming , Zhu Sheng , Feng Xue Qiang , Liu Yu Xiang
Published: January 2014

The deposition behavior of Al-Si particle on magnesium alloy by supersonic particles deposition was investigated by numerical stimulation. The results demonstrated that critical velocity of sprayed particle reduced as its initial temperature increased; Temperature at interface increased rapidly and reached to the value higher than melting point of Al-Si particle and ZM5 magnesium substrate, which predicts the melting possibility for collision interface. Morphology and microstructure of Al-Si coating on magnesium alloy were analyzed by SEM and TEM. The results indicated that there existed large amount of nano/micro-scale grains produced by sputtering and impacting of the melting Al-Si jet. And obvious interface belt had been formed at brim of the deposited particles, nanocrystalline phase region generated by rapid solidification of melting Al-Si particles, justified the occurrence of interface melting phenomena.
Study on Laboratory Evaluation of Temperature and Salt Resistance Polymer Solution
Authors: Tian Quan , Sun Ling Hui , Kou Hui Hui
Published: January 2014

At present, China's late stage of oilfield most mining has been reached, there is high water content, and produced low levels problems. Polymer flooding enhanced oil recovery technology is important today, but Pam can't adapt oilfield tertiary oil recovery reservoir with heat resistance and salt. This article examines five kinds of rheological properties of polymer solutions under different salinity, studied under the same mineralized shear viscosity of different polymers. Experimental results show that the shear resistance capacity of 20 million ordinary polymer strong, 8 million and temperature of salt-tolerant associative polymer viscosity retention rates are highest. Less than 5,000 ppm 18 million under NaCl salinity salt resistant polymer viscosity highest salinity between 5,000 ppm NaCl to 15,000 ppm NaCl 8 million and temperature of salt-tolerant hydrophobically associating polymer solution viscosity of the highest.
Nanosheet Films of Schiff Bases Polymer for Micropatterning
Authors: Wang Qiu Ling , Li Yong Na , Jia Hui Ying , Wei Yong Ze , Du Hui Fan , Li Tie Sheng , Xu Wen Jian , Wu Yang Jie , Miyashita Tokuji
Published: January 2014

A series of novel copolymers [p (AOBHA-co-NPMA)] containing 2-Allyloxy-N-benzylidene hexadecylamine (AOBHA) as film formation material and β-naphtayl methacrylate (NPMA) as photosensitive group were synthesized by free-radical polymerization. The copolymers could form stable condensed monolayer at air/water interface and be transformed onto solid substrates. Positive-tone patterns with the resolution of 0.75 μm of the copolymers Langmuir-Blodgett (LB) films with 35 layers were fabricated by deep UV irradiation, followed by developing with acetone. The etched gold patterns with resolution of 0.75 μm were also obtained, showing that the copolymer has enough resistance to wet etching suitable for fabricating photomask. The mechanism of photolysis was also investigated by UV and GPC, in which showed that the scission of main and side chain of p (AOBHA-co-NPMA) LB films occurred at the same time.
Structural Parameter Identification Based on Dynamic Response Sensitivity with Non-Zero Initial Conditions
Authors: Zhang Kun
Published: January 2014

The effect of non-zero initial conditions of measured structural responses on the structural parameter identification methods based on dynamic response sensitivity is investigated and an effective method is proposed to eliminate the negative effect. A twelve-story shear building structure is studied for validating the proposed method. Numerical simulation results show that the non-zero initial conditions of measured data bring larger identified errors in the dynamic response sensitivity methods. To overleap some measured data points in the initial period of the time interval is an effective method for eliminating the identified errors caused by non-zero initial conditions. The optimal number of overleaped data can be determined from the attenuation trend of the 1st-order free modal vibration of the structure.
Research on Shear Performance of Asphalt Mixture Based on RSCH
Authors: Guo Fang , Gu Wei
Published: January 2014

On the use of the Superpave Shear Test which was developed by Stratagem Highway Researching Plan in America (SHRP),this paper simulates the effect of two-way shear load in asphalt concrete (AC) overlay on the existing cement concrete pavement. According to the RSCH research on 7 kinds of asphalt mixtures,evaluating the shear performance of asphalt mixtures. The results showed that: 1. There was a significant correlation between the repeated shear times and shear strain using logarithmic curve; 2. void ratio had a greater influence on the shear performance of asphalt mixture.With greater void ratio, the shear strain is more sensitive to load. It takes more shear deformation to enter the stage on shear stability, and the stronger the ability to adapt for shear deformation; 3.with the same gradation and different asphalt variety, shear performance are different. When asphalt mixture is subjected the shear action, especially the instantaneous load, a high viscosity bitumen asphalt mixture can be given a large viscous resistance.
Hydrodynamic Impact on Pearl River Estuary from HZM Bridge
Authors: He Jie , Xin Wen Jie
Published: January 2014

The HZM(Hongkong-Zhuhai-Macao) bridge connects Hongkong, Zhuhai and Macao district, and it strctchs across the Pearl River estuary. A lot of piers and three large artifical islands would have some impact on the hydrodynamic environment in the Pear River estuary. In this paper, a 2D tidal current numerical model is introduced to simulate the hydrodynamic impact from the HZM brdige. The simulated results show that the Hydrodynamic influence is concentrated on the 5.0 km range from downstream to upstream nearby the navigation zone and the 1.0 km range of bridge site in not-navigation zone, and the tidal range reduction is limited 0.03m and the tidal prism reduction is not more than 1% in the Lingding Sea after the HZM bridge constructed. Therefore, the HZM bridge has little influence on the distribution of hydrodynamic environment in the Pearl River estuary.
Characteristics and Related Research of through and Half through Arch Bridges in China
Authors: He Wei , Chen Huai
Published: January 2014

As an important transportation infrastructure, some through and half through arch bridges were collapsed at home and abroad. And most accidents were caused by the damage of suspenders. From the structural features, through and half through arch bridges were composed of two parts-upper and lower structure. The upper part of the structure was mainly composed of arch rib, suspender, tie bar, carriageway beam and bridge deck system etc. Research at home and abroad on through and half through arch bridges mainly include: seismic performance, stability, wind vibration, construction, maintenance, suspender tension test, damage identification of the bridges, and so on.
Design of Reinforced Concrete Segment for Cross River Shield Tunnel in Long Distance Gas Pipeline Project
Authors: Wang Xiao Feng , Zhou Xiao Jun , Hu Hong Yun , Zhang Xiang Pu
Published: January 2014

This paper summarizes the basic design of reinforced concrete segment for cross river shield tunnel in gas pipeline project, meanwhile discusses its assembly style and water-proof technique. One loop of shield tunnel is divided into six pieces of precast reinforced concrete segment which is assembled with screw bolt and stud. In addition, Waterproof technique such as self-waterproof of segment, elastic rubber gasket and water swelling rubber strip is used to ensure waterproof performance of shield tunnel. The presentation of this paper may provide guidance for the design of reinforced concrete segment for cross river shield tunnel.
Study on the Effect of Warm Mix Modifiers on the Performance of Guss Asphalt
Authors: Cao Xing Song , Cao Dong Wei , Wu Yi Fei , Yang Xio Qiang , Liu Shi Xiong
Published: January 2014

In order to comparatively study the effect of warm mix modifiers on the road performance of guss asphalt, the guss asphalt mixtures, whose asphalt aggregate ratio were 8.5%,9.0%,9.5% respectively, were mixed with 0%,1%,2%,3% of the RH and Sasobit warm mix modifiers. Then by means of Lueer test, penetration test, wheel track test and low-temperature bending test, the performance of guss asphalt were evaluated. The test results show that: RH and Sasobit can effectively improve the workability of guss asphalt; RH is better than Sasobit in reducing viscosity of guss asphalt; RH reduces the high-temperature properties of guss asphalt; On the contrary, Sasobit can improve the hightemperature performance of guss asphalt; RH and Sasobit have an adverse impact on the crack resistance of guss asphalt in low temperature, so their content should not too high. Guss asphalt has characteristics of high construction temperature and energy consumption. In order to reduce construction temperature, based on energy conservation, low-carbon emission environment, reduce the aging of asphalt principle, warm modifiers could be used to reduce the viscosity of guss asphalt at high temperatures[1-5]. Sasobit modifiers imported from Germany are used much more to improve the workability of guss asphalt. In this paper, 0%, 1%, 2%, 3% RH and Sasobit warm mix modifier were mixed with the aggregate ratio of 8.5%, 9.0%, and 9.5% of the Guss asphalt to compare and analyzed the performance of those two warm modifiers on Guss asphalt.
Wind-Induced Vibration Control and Analysis of Super High-Rise Structure Using Viscous Damping Walls
Authors: Guo Yan , Liu Wen Guang , Zhang Jian , He Wen Fu
Published: January 2014

The wind-induced vibration control and analysis of a super high-rise structure located in the area of strong typhoon with viscous damping walls is introduced. Mechanical properties and design method of viscous damping wall are described, and then the arrangement scheme is put forward. The performances of structure with and without viscous damping walls under the condition of basic wind strength encountered once for 10 years are investigated in detail. The results show that the control scheme can dissipate energy of wind-induced vibration, attenuate structural dynamic response and reduce the mutation of acceleration along height direction effectively. The maximum peak acceleration can be reduced by 23.5% to 0.241m/s2, which meets 0.25m/s2 limit value stated by Technical specification for concrete structures of tall building. Therefore, the arrangement scheme is feasible and effective to control wind-induced vibration and improve structural safety and comfort.
Effect of Axial Compression Ratio and Concrete Strength on Seismic Performance of Concrete Filled Steel Tube Beam-Column Joints
Authors: Wang Ying , Li Miao , Xu Jin Hua , Fan He
Published: January 2014

Based on finite element analysis o f concrete filled steel tube beam-column joints under the single axial compression ratio and concrete strength, further research was done to analyze the seismic performance of concrete filled steel tube beam-column joints under different axial compression ratio and concrete strength. Beam-column joint which is connected by bolts with welding extended steel sheets at the beam root was analyzed. The results show that with the increase of axial compression ratio, strength and stiffness degradation of the joint accelerated gradually. Axial compression ratio at 0.3, 0.4 are appropriate values for joints specimen, load-displacement hysteresis curve of joint specimens is relatively plump and shows good seismic performance. Chance of concrete strength also had effect on seismic performance of joint specimen, but in contrast it is not so obviously.
Preparation and Properties of Ultra-Fine Grain Medium-Carbon Steel Based on Warm Deformation
Authors: Wang Jian Min , Zhao Yan , Cheng Ke Sheng , Wan Li
Published: January 2014

Combining phase transformation with deformation effectively, a new preparation process of ultra-fine grain medium-carbon steel using martensitic steel was developed. In this research, quenched steel was heated to 500~600 °C quickly, and tempered for an appropriate time to retain a certain degree of supersaturation. Then quick warm deformation was implemented. By the action of twinning, dislocation decomposition, recrystallization, etc., which realizes dislocation motion on slip planes to form dislocation forests or cross-slip, supersaturated ferrites are refined quickly. Strain-induced cementite particles precipitate dispersively in grain boundaries or sub-grain boundaries, and uniform and stable structures are obtained.
Study on Blasting Technology and Control Measures of Shallow Tunnel
Authors: Zou Yu Lin , He Cong
Published: January 2014

Based on a municipal highway tunnel in western China, for the building of the tunnel surface dense, especially import Portal Jude Biao most shallow depth of less than 10m building project, we proposed borehole layout, charge and detonate Network Road design method, and the corresponding control points of drilling and blasting operations and blasting safety control measures and means to ensure that the duration and quality of construction, can provide some experience of similar projects and basis.
Investigation and Development on Phase Change Energy Storage in Adjustment and Control of Building Indoor Temperature
Authors: Li Wei Huan , Zhu Xiao Qin , Hu Jin , Chang Jing Hua , Ni Hai Yang , Li Ting Zhou
Published: January 2014

Since energy storage with phase change materials is an effective means of energy saving or conservation in buildings, its investigation and applications have received more and more during the recent years. The research actuality on energy saving of adjustment and control of building indoor temperature was summarized in this paper, and the two types of the major techniques with phase change material applied in adjustment and control of building indoor temperature was reviewed, in which one is the technique combined phase change material with building maintenance structure, the other is the technique to make phase change material applied to heating or air conditioning systems. The future research of phase change energy storage in adjustment and control of building indoor temperature was prospected.
Effects of Heat Source Model and Welding Speed on Welding Temperature Field for a Plan Carbon Steel Plant
Authors: Song Z.K. , Li Z.Y. , Xu J. , Sun Y.C.
Published: January 2014

This article studies the effects of heat source shape parameter and welding speed on the evolution of welding temperature field for Q345 plan carbon steel. The heat input and heat source parameters as well as the welding speed are defined by applying DFLUX subroutine in ABAQUS to simulate the transient welding temperature. The effects of heat resource shape parameters and heat input as well as the welding speed on welding temperature field are investigated by means of finite element analysis. It has been found that heat source parameters and welding speed show strong influence on temperature distribution in FZ (fusion zone) and HAZ (heat-affected zone). Meanwhile, it shows a roughly linear relationship between the changes of heat input and the highest temperature.
The Structure and Thermal Properties of ZrAlYN Films Deposited by Magnetron Sputtering
Authors: Xian Guang , Zhao Hai Bo , Fan Hong Yuan , Du Hao
Published: January 2014

ZrAlYN films were prepared by magnetron sputtering at various N2/Ar flow ratio. The structure, composition and thermal properties were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectrum. The results show that the deposited ZrAlN and ZrAlYN films possessed a single NaCl-type solid solution phase. The ZrAlN film was (200) strongly predominated. The (111) peak was prominently increased in ZrAlYN films and thus the preferred orientation changed to (111) and (200) co-predomination. The crystallinity of ZrAlYN films was gradually degraded with enhanced N2/Ar flow ratio. Both ZrAlN and ZrAlYN films were exhibited a featureless fracture microstructure. The thickness of ZrAlYN films was consistently reduced due to more nitride produced on the surface of targets at higher N2/Ar flow ratio. The ZrAlYN films deposited at 1:5 N2/Ar flow ratio was proved to be the best oxidation resistance under annealing at 1000°C for 2h in air. As N2/Ar flow ratio increased, the oxidation resistance of films was inversely deteriorated due to the decreased yttrium content in films.
Synthesis of Fe3O4 Nanotubes under Assistance of Microwave by Tuning Chemical Deposition Mechanism and its Magnetic Properties
Authors: Pan Rong Jun , Li Zheng Lin
Published: January 2014

To overcome the overcoming of agglomeration and reclamation of nanoparticulate materials, it is imperative to synthesize nanosized materials with other morphologies. Fe3O4nanotubes were synthesized by using anodized aluminum oxide as template under microwave assistance by tuning the deposition mechanism in this work. The obtained nanotubes were characterized by the means of XRD and SEM. Its magnetic property was also investigated. Results show that tubes are of the spinel structure, a layer of about 30 nm Fe3O4was deposited attaching to the AAO wall, and the nanotubes possess good magnetic performance.
Preparation and Gas Sensing Properties of Microrod ZnO Materials
Authors: Yang Liu Fang , Wang Yu Lin , Wang Qin Hui
Published: January 2014

Using zinc chloride solution and ammonia (25%) as raw material, with the presence of surfactant (CTAB), the microrod ZnO material was synthesized by the hydrothermal method. The phase composition and microstructure of the prepared ZnO material were characterized with XRD and SEM. The results show that the ZnO material possesses a high degree of crystallization, its diameter below 4 μm, and its length about 35 μm. The gas sensing property of gas sensor fabricated with the prepared ZnO material was evaluated via the static volumetric method. At the operating temperature of 200°C, the gas sensor has high sensitivity and selectivity to CH3COCH3.The gas sensing characterization was also discussed.
Compact Modeling of Lightly Doped Nanoscale DG MOSFET Transistor
Authors: Smaani Billel , Bella Mourad , Latreche Saϊda
Published: January 2014

In this paper, a compact modeling of lightly doped nanoscale Double Gate (DG) MOSFET transistor is presented. In the first time, a DG MOSFET transistor with long channel is considered. In this case, by using 1-D Poissons equation and applying the Gauss law at the interface of Silicone/Oxide, the static behavior of the long channel DG MOSFET can be observed by simple relationships between charges-voltages and charges-drain current. In second time, the dynamic behavior of the device is described through the intrinsic trans-capacitances. The present results (obtained using MATLAB) are validated by comparing them with those obtained using commercial software (Silvaco Atlas-TCAD).
Bayesian Algorithm Based on Airborne Power Supply System
Authors: Jiang Xu , Hua Jing Yu
Published: January 2014

The design assessment of airborne power system can be started from designing stage of the power system. It can analyse and evaluate the status of the power system. The key to the designation of evaluation system is how to evaluate the performance of the power system. With airborne power system as the research object, combined with military standard GJB181A - 2003,and through the onboard power system for co-test, it can establish a set of objective assessment strategies and methods can achieve comprehensive evaluation on the performance of airborne state of power system. Based on bayesian theory evaluation method. With 28 v low voltage dc onboard power system as an example, intercepting the multiple sets of test and analysis data to evaluate instances test and comparative analysis of the model, a comprehensive evaluation and the rationality of the evaluation result is verified by relevant experimental data.
Hot-Corrosion Behavior of Modified YSZ Thermal Barrier Coating
Authors: Wang Yi , Chen Li Jia , Suo Hong Li , Meng Yi Chen
Published: January 2014

A modified YSZ thermal barrier coating (TBC) was prepared by simultaneously depositing two components, NiCrAlY and YSZ, on nicked-based superalloy DZ125 via atmospheric plasma spraying. In this study, the sodium salt was deposited on substrate surface at the deposition rate of 3 mg/cm-2. After being heated at 950 °C for 50min, the specimens were cooled to ambient temperature within 10 min. The specimens were recoated after each 10 cycles. Subsequently, the corrosion products were analyzed via X-Ray diffraction and SEM. The results indicated that deterioration of traditional YSZ coating mainly resulted from the fluxing of thermal grown oxides (TGO). Conversely, abnormal growth of TGO and enrichment of molten salt around segmentation crack were not observed in the modified YSZ thermal barrier coating. Moreover, the modified YSZ-TBC exhibited higher thermal resistance than traditional YSZ-TBC in the thermal cycling testing.
A New Type Mold Shell Used for Turbine Blade Production
Authors: Sun Shao Chun , Xu Wei Tai , Zhang Yan , Guo Hai Bin , Zhang Ruo Huan , Shi Nan Qi , Zhao Yu Tao
Published: January 2014

Mold shell with higher thermal conductivity was introduced in the article. Reinforced by the carbon fiber, the new type sol silicate mold shell could be made with much less layers while without reducing its strength. Therefore, the new-type mold shell should have higher thermal conductivity. Then measure its thickness, bend strength, analyze the dendritic crystal of the casting manufactured with the new-type mold shell. It was proved that the thickness had reduced by 25% and the bend strength did not decrease. And it performs better in the detection: the dendrite crystals are refined, the primary and secondary dendrite arm space are decreased, the secondary dendrite arms are restrained.
Fuzzy Based Intelligent Approach to AGC of Multi-Area Multi-Unit Power System with SMES under Random Load Disturbances
Authors: Suhag Sathans , Swarup A.
Published: January 2014

In reality, load variations in power systems are random in nature. Therefore, the automatic generation control (AGC) performance of the power system needs to be investigated under random load disturbances so as to have a realistic evaluation of the control strategy. This paper reports results for one such investigation. The intelligent control strategy, based on fuzzy gain scheduling of a proportional-integral (PI) controller, is developed and implemented for a multi-area multi-unit thermal power system with reheat nonlinearity. The paper also investigates the effect of superconducting magnetic energy storage (SMES) system on the AGC performance. For the sake of comparison, the behavior of the system for the same load disturbance is also investigated with a conventional PI controller. Simulation studies indicate that the proposed intelligent control strategy is very effective under random load disturbances and provides significant improvement over the conventional PI controller.
The Research of CDEGS in Defect Diagnosis for Grounding Grid
Authors: Ren Ang , Li Qing Quan , Liu Ran , Qi Yan Feng , Liu Xu Jie , Wang Li Xin , Han Guo Dong , Liang Yuan Bin
Published: January 2014

The paper briefly introduces the function and characteristics of the ground simulation software CDEGS, and computes the grounding grid model by using the MALZ module. The grounding grid GPR (Ground Potential Rise) and the percentage of reference power bus GPR are analyzed after the exciting current source injected into the grounding grid, and compared and analyzed with CDEGS softwares simulation calculation results, it is easy to diagnose defect and locate defect position in the grounding grid.
An Experimental Setup Design to Evaluate Power Generation Performances of TECs under Different Temperatures
Authors: Akarslan Emre , Çınar Said Mahmut , Hocaoğlu Fatih Onur , Serttaş Fatih
Published: January 2014

Thermoelectric Cooler (TEC) is a semiconductor based device that has ability to separate cold and hot temperatures once the rated voltage is applied. In this study, TECs are used as Thermoelectric Generator (TEG). For this aim an experimental setup is built. By the help of this experimental setup electricity generation performances of the TEC is tested under various temperature conditions. The setup includes two water tanks, loads, TEC modules, computer interface and a data acquisition system. Temperature difference required for electrical generation of the TEC module is provided by filling the tanks with water at different temperatures. A data acquisition system is designed for this specific setup. First the setup with data acquisition system is introduced then experimental results are presented and discussed.
Keywords:Electrical energy generation, Thermoelectric Cooler, LabVIEW
Study on the Resistance Characteristics of Heat Metering System Based on Electric Valve
Authors: Gong Dong Jun , Zhang Yao , Li Xing Ru , Fang Li De , Wei Zi Hui , Zhao Ning
Published: January 2014

Through theoretical calculations and derivation, the paper obtained the relationship between resistance coefficient and pressure difference, as well as flow rate. For the series pipeline, the flow in the series pipeline is the same, as a result, all the resistance in the series pipeline is the total resistance. For the parallel pipeline, the pressure difference is same, and the all the flow in parallel pipeline is the total flow. According to the real example, the paper identified the inlet pressure difference of the indoor system, the most unfavorable ring and the ratio frictional resistance. Based on the room heat load calculation, the paper determined the most unfavorable loop diameter of each pipe section. By calculating the resistance coefficients of the electric valve at opening, the resistance coefficients of the electric valve at closing were obtained. In the experiment system, the resistance coefficient average value when the electric valve is off was 101831.65, which is basically in line with the calculable value 10719.6, indicating that the existing parameters are much more reasonable.
Loss Analysis and Calculation Method of the Switched Reluctance Motor
Authors: Wu Hong Xing , Zhao Kai Qi , Zhou Shou Ming , Zheng Ji Gui
Published: January 2014

The complex magnetic flux density waveform of switched reluctance motor (SRM) leads to very difficult calculation of motor losses especially iron loss. In this paper, SRM’s losses are analyzed as the object of study, the working principle and base frequency of SRM are described, SRM’s losses are decomposed, and a detailed analysis of motor copper loss, mechanical loss and stray loss is proceeded. Iron loss especially under nonlinear magnetic flux waveform is studied, and calculation formulas and compensation coefficient of various losses are obtained at last.
Heat Transfer Effectiveness and Coefficient of Pressure Drop on the Shell Side of a Staggered Elliptical Tubes Bank
Authors: Budi Utomo Kukuh W. , Samsul Kamal , Suhanan Suhanan , Suardjaja I. Made
Published: January 2014

The effectiveness of heat transfer and the pressure drop coefficient of staggered elliptical tube banks are studied experimentally. The bank consists of 11 elliptical tubes of 0.75 equivalent diameter in an arrangement of 4-3-4. The major and the minor sub-axis of each tube are 24.70 mm and 12.35 mm respectively, and therefore the aspect ratio (AR) of the tube is 2.0. The geometric parameters of the bank are ST = 24.70 mm, SL = 37.00 mm and minimum frontal area B = 12.35 mm. Seven mid-tubes are internally heated by electrical heater of 69.6 Watt each. Experiment is conducted in a sub sonic wind tunnel and run with the wind velocities of 1 m/s 12.6 m/s which correspond with Reynolds number of = 346-6904. The results show that the effectiveness (ε) varied from 2144.44 to 15.26. It decreases exponentially at low Reynolds numbers and tended asymptotically at higher Reynolds number. The coefficient of pressure drop (CΔp) ranges from 7.21 to 4.41 decreases continuously at low Reynolds number and asymptotic at higher one.