bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Mechanical Stability of Retained Austenite in Cold-Rolled Medium-Mn Steel
Authors: Hu Jun , Cao Wen Quan , Shi Jie , Dong Han
Published: June 2014

The mechanical stability of the retained austenite in the cold-rolled medium-Mn steel was studied. Tensile tests were carried out to measure the mechanical properties of the annealed steel. Scanning electron microscopy was applied to characterize the microstructure evolution during the tensile process; X-ray diffraction analysis was used to determine the residual austenite content in the deformed steel. It was found that the volume fraction of retained austenite gradually decreases with strain .The value of the stability coefficient of retained austenite k was small in the test steel, which indicated high mechanical stability of retained austenite. Due to TRIP effect, the high mechanical stability of the retained austenite strongly delays the onset of necking, which resulted in good comprehensive mechanical properties with ultrahigh strength and plasticity.
Effect of Hydrogen on the Micro- and Macro-Strain near the Surface of Austenitic Stainless Steel
Authors: Takakuwa Osamu , Mano Yuta , Soyama Hitoshi
Published: June 2014

The objective of this study is to evaluate the effect of hydrogen on the micro-and macro-strain of austenitic stainless steel using X-ray diffraction. When hydrogen is trapped in lattice sites, it can affect both the micro-and macro-strain. The micro-strain was evaluated through fitting profiles to measured X-ray diffraction profile using a fundamental parameter method. The macro-strain, i.e., the residual stress, was evaluated by a 2D method using a two-dimensional PSPC. The experimental samples were charged with hydrogen by a cathodic charging method. The results revealed that the induced residual stress was equi-biaxial and compressive, and that the micro-strain increased. Both of these varied rapidly with increasing hydrogen charging time. Saturation occurred at a compressive stress of around 130 MPa. On reaching saturation, the hydrogen charging was terminated and desorption of hydrogen began at room temperature. Then, the strains decreased and the compressive stress reverted, ultimately, to a tensile stress of 180 MPa. Martensitic transformation occurred due to hydrogen charging and this had a significant effect on the X-ray diffraction profile.
Thermographic and Microstructural Analysis of Martensitic Stainless Steel ASTM A743 CA6NM Arising out of Layered GMA Welding Process Using AWS 410 NiMo Welding Wire
Authors: Santos Matheus Tabata , Muterlle Palloma Vieira , de Carvalho Guilherme Caribé
Published: June 2014

The martensitic stainless steel ASTM A743 CA6NM is typically used in the production of hydroelectric turbines due to its known high resistance to cavitation induced surface damages. Despite the fact the material presents a high resistance to cavitation, depending on the loading condition to which the turbine runner is subjected and on its geometry, fatigue cracks can develop, thus requiring repair by means of removing material around the crack, up to its complete elimination, and by depositing weld metal in the cavity followed by a grinding process, in order to recover the original runner geometry. Such a repair process is normally done on site, which means that it is not possible to carry out the post weld heat treatment necessary to bring the newly deposited weld metal and the base metal to the same microstructure encountered in the runner when it comes out of manufacture. In order to study the effect that a layered welding has on the base material and on the weld metal, this work aims at studying the microstructural changes that occur in the CA6NM stainless steel welded in multiple layers with a AWS 410 NiMo welding wire. In order to attain such an objective, several 410 NiMo weld beads were deposited in successive layers on the border of a 5mm thick sheet while the resulting temperature fields were monitored by a thermographic camera. After the welding process, the samples cut from the welded sheet were examined in the perpendicular direction of deposition and their resulting microstructures where analyzed and correlated with the temperature history recorded during the welding process. Hardness tests were also carried out.
Application of Calcium Treatment to Sulfur Gear Steel 20CrMo
Authors: Wu Xiao Dong , Zhang Dao Xin , Chen Rui Long
Published: June 2014

Based on the thermodynamic calculation, the conditions of calcium treatment to sulfur gear steel are analyzed and the samples of rolled steel are studied. Results show that Calcium treatment to melting steel after RH refining can make the sulfide inclusions and calcium aluminates bind together and form the spindle shaped low melting compound inclusions. In the meanwhile, controlling of w (O) in steel below 0.0012% before calcium treatment is more beneficial to modify the Al2O3 and sulfide by the added calcium and to form the oxide-sulfide compound inclusions only if w (AlS) in steel is adjusted to 0.015%~0.025% before continuous casting. The Ca wire should also be fed at higher temperature.
Mechanical Damage Model of Concrete Subject to Freeze-Thaw Cycles Coupled with Bending Stress and Chloride Attack
Authors: Du Peng , Yao Yan , Wang Ling , Cao Yin
Published: June 2014

As the action mechanisms of various factors affecting concrete durability are different, it is difficult to understand the durability of concrete exposed to multiple factors using only mechanism analysis. Converting each action mechanism to an appropriate macroscopic mechanical effect can simplify complicated durability problems. Here we study concrete beams exposed to common environmental factors: cyclic freezing and thawing, bending stress and chloride attack. By converting each mechanism into a mechanical process and analyzing its effect on concrete, a damage model based on strain was established. Freezing-induced tensile stress is essentially a low-cycle fatigue tensile stress, as represented by a saw-tooth model. The maximum strains when the maximum freezing-induced tensile stress coupled with the four-point bending stress in every freeze-thaw cycle were measured, and found to increase with freeze-thaw cycling. Our damage model provides a new approach to predict the service life of concrete, and guidance for durability design of concrete.
Analysis of Curing Agent on the Strength of Lightweight Soil Using Recycled Sludge
Authors: Wang Guo Cai , Yu Lin Chun , Sha Ling
Published: June 2014

In order to study the inorganic composite curing agents of lime, gypsum, fly ash on the strength properties of EPS lightweight soil using recycled sludge, the unconfined compressive strength test and scanning electron microscope test are done to investigate the strength properties of EPS lightweight soil. The effect and scope of each curing agent is investigated and determined by means of single-doped unconfined compressive strength test, and the optimum proportion of the curing agent is further determined by the method of orthogonal unconfined compressive strength test, of which the stabilized effectiveness of the lightweight soil is compared with those only using cement as curing agent. Finally, the SEM test is done to study the microstructure and pore characteristics of the lightweight soil mixed with EPS adding with or without curing agent. The test results and curing agent can be used as conference when stabilizing soft soil and treatment of discarded clay.
Theoretical Study on Seismic Behavior of LYTAG Concrete
Authors: Zhang Lin Chun
Published: June 2014

In order to estimate seismic behavior of LYTAG concrete, the seismic behavior of ordinary concrete have been studied in comparison with LYTAG concrete in this article. At first it discusses the advantages of LYTAG concrete, and then it draws following conclusions through the contrast tests of LYTAG concrete and ordinary concrete and the method of finite element analysis. The seismic performance of Lytag concrete is better than that of ordinary concrete. LYTAG concrete has better social and economic benefits than ordinary concrete from the aspects of seismic fortification.
The Frost Resistance of LYTAG Concrete
Authors: Zhang Ai Lian , Zhang Lin Chun
Published: June 2014

This article studies the frost resistance of LYTAG concrete and ordinary concrete respectively used the RILEM recommended test method (CIF) about frost resistance of concrete. The results indicate that the single surface's frost resistance of Lytag concrete with mineral admixture is much better than normal density concrete's. And the rank of the single surface's frost resistance at 56 cycles of Lytag concrete with different mineral admixture is: silica fume and slag> silica fume and fly ash>slag and fly ash>silica fume>fly ash>slag. The important reasons why LYTAG concrete has good frost resistance is that the scope of blending interfacial transition zone of LYTAG concrete between aggregate ceramsite and cement stone was significantly smaller than ordinary concrete.
Bending Properties of Laser Welded Web-Core Steel Sandwich Plates
Authors: Jiang Xiao Xia , Zhu Liang , Qiao Ji Sen , Wu Yi Xiong , Li Zhu Guo , Chen Jian Hong
Published: June 2014

This paper presents a detailed discussion of the bending properties of laser welded web-core steel sandwich plates and the influence of weld width on stiffness and strength. The over-hanging three point bending test was conducted on the laser welded web-core steel sandwich plates with various welds width by self-designed device, together with the finite element simulations. A good agreement is obtained between the 2D FE analyses and experiment results. The stiffness and strength of the sandwich plates increased with the increasing of weld width, especially for the weld width lower than 60% thickness of the core plate. It is necessary to consider the weld width in the design and evaluation of the stiffness and strength of the laser welded web-core sandwich plate. Base on the results, the FEM is the priority to analysis bending properties of laser welded web-core steel sandwich plates.
A Effective Solution Method Based on Bayesian Rule for Prediction of Long-Term Tensile Strength of GFRP Bars in Concrete Beams
Authors: Dai Li , He Xiong Jun , Shen Feng
Published: June 2014

It is necessary to research on the long term structural behavior of GFRP bars in concrete by limited samples. The two models, Arrhenius Equation and Fick’s Law were compared to form a long-term durability prediction thinking. Based on the work and ideas of the prior researchers, a detailed derivation of the iterative equation on the Bayesian prediction was conducted. Especially, a new likelihood function was set up to solve the long term behavior prediction of GFRP bars in concrete with less information. Then a new and effective solution method was developed. The residual strength behavior of GFRP bars in concrete beams after seven years’ environmental exposure was analyzed. The results showed that the theoretical predictions and experimental data were very close and theoretical prediction model was reasonable.
Numerical Simulation for the Damping Effect of Empty Holes on Blasting Vibration
Authors: Bian Kai Fang , Li Hai Bo , Liu Ya Qun
Published: June 2014

The two-dimensional discrete element program (UDEC) is applied to simulate the dampi- ng effect of empty holes on blasting vibration. The results show that the peak particle velocity of monitoring point on the condition that there are empty holes between monitoring point and blast hole is less than that without empty holes. The factors which have impact on cushioning effect, such as the depth of empty hole, the diameter of empty hole, the distance between empty hole and blast hole and the rows of empty hole, are investigated numerically. It is found that the depth of empty hole has dominated influence on the damping effect and the damping effect on blasting vibration strengthens with the increment of the depth. The diameter of empty hole and the distance between empty hole and blast hole have slight influence on the damping effect. The increment of rows of empty hole can enhance the damping effect on blasting vibration as well. The results in the present study may provide a reference for the application of empty hole to reduce the blasting vibration in practical engineering.
Analysis on the Effect of External-Wall Insulation on Energy Consumption of Residential Building in Lanzhou
Authors: Li Chu Ne , Wang Gang , Wang Ya Jun
Published: June 2014

Based on the comparison of external wall with different insulation thicknesses and without insulation, residential buildings energy consumption was simulated by using hourly energy consumption simulation software DeST-h in Lanzhou.The effects of external wall insulation on building energy consumption were analyzed. The result shows that the total annual load can be reduced to 42% ~ 72% with the insulation thicknesses vary from 10mm to 80mm. But With the increase of the thickness of the insulation layer, the amount of fluctuation of building load reduce gradually.That is not to say the insulation layer is thicker the energy saving effect is more distinct and there is shoud be the thickness is the most economical thickness. So the economic insulation thickness is determined as 40mm by using a life-cycle cost analysis.
Finite Element Analysis of Rainfall Infiltration in a Compacted Loess Embankment
Authors: Lv Qing Feng , Liu Peng Fei , Zhao Yan Xu
Published: June 2014

Because of evapo-transpiration, compacted loess road embankments were considered to be in a partially saturated state in both arid and semi-arid regions. Based on previous studies and the theory of unsaturated soil mechanics, a numerical analysis of rainfall infiltration in a compacted loess road embankment was conducted. The transient seepage characteristics and moisture migration patterns of the moisture in the embankment were analysed. The results showed that after precipitation, the moisture profile of the compacted loess could be separated into three zones .The data also showed that: under the effect of gravity, the water continued to migrate into the embankment after the rainfall had ended. In time, the saturated zone became partially saturated as the moisture content decreased, whereas the moisture content in the conducting and humid zones increased and the wetting front moved downward. The data also showed that the depth of the conducting and humid zones increased in time, but that the moisture content in the conducting zone increased along a linear gradient with depth, while the moisture content in the humid zone decreased in a similar manner.
Numerical Analysis on Synergetic Behaviors of AE in Concrete Failure Process
Authors: Wei Li Hua
Published: June 2014

The AE phenomenon can show the laws of concrete break well. In virtue of researching the relationship between inner structure state change and AE characteristic, the synergetic characteristic of AE in the concrete failure process was analyzed. Opened out the laws of concrete failure on high levels, and beneficially discussed the synergetic characteristic of AE. It is value to forecast the trend of concrete stability before failure and nondestructive testing.
The Application of Based on Case-Based Reasoning for Drilling Parameter Optimization in HaiTa Oilfield
Authors: Chang Lei , Yan Tie , Li Shan , Fei Hong Ming
Published: June 2014

In the view of the complex influence factor, simplified research method and structural or partial structural application model a drilling parameter selection optimization method based on case-based reasoning is provided in this paper. The goal of the research is to build up a drilling parameter selection optimization method which has great applicability. Based on the field drilling data and parameters a case base is built up. Afterward data discovery is used to deal with the case selection problem and select case from case base. Combining with field situation, drilling parameters selection is optimized and drilling speed could be predicted.
Evaluation of Uncertainty of Hydrogen's Consistency in Transformer Oil by Gas Chromatography
Authors: Shen Han Lin , Luo Hai Yan
Published: June 2014

According to the Evaluation and Expression of Uncertainty in Measurements, the author establishes the mathematical model for measuring the purity of hydrogen in transformer oil by means of Gas Chromatography. Meanwhile the author analyses resources of uncertainty and deduces formulas of uncertainty measurement. By calculating uncertainties of the components, the author obtains the synthesis uncertainty.
A Same Area Method Used to Calculate the Strain in Forming for an Axisymmetric Workpiece
Authors: Han Zhi Ren , Xu Qiang , Yuan Ze Bing
Published: June 2014

An experimental study is conducted to explore a new method to calculate the strain in axisymmetric workpiece forming. When designing deep drawing die for an axisymmetric workpiece, the principal strain during the forming is needed to estimate formability and to decide whether the forming is finished in one pass. Strain calculation is a difficult task, so an ideal same area method used to calculate the strain for an axisymmetric workpiece along with a correction same area method considered thickness reduction rate is proposed here. The deep drawing test for an axisymmetric workpiece is used to obtain the strain along circumference and generatrix direction. The strain along the two directions calculated by the ideal same area method and correction same area method is compared with experimental results. The results show that ideal same area method can be used to calculate the strain during the forming process for an axisymmetric workpiece and the result from correction same area method is close to the experiment.
Brazing Incoloy 800 Using the MBF-51 Filler Foil
Authors: Chen Wen Shiang , Shiue R.K.
Published: June 2014

The purpose of this research is focused on developing a reliable plate heat exchanger made by Incoloy 800 (IN-800) alloy featured with high corrosion resistance in order to replace the current Cu brazed plate heat exchanger made by the 316 stainless steel. A Ni-based filler, MBF-51, was applied to braze the plate heat exchanger made by IN-800. According to the brazing optimizing experiments, the successful brazed joint was made by brazing at 1170 °C for 1800 s. Better shear strength is achieved from the specimen brazed at 1120 °C for 1800 s.
Effect of Aging on Microstructure and Performance after Superplastic Deformation of Fine Grained 1420 Al-Li Alloy
Authors: Zhang Yan Ling , Hou Hong Liang , Wang Yao Qi
Published: June 2014

Superplastic forming (SPF) is an important process for forming fine grained 1420 Al-Li alloy. However, the mechanical properties will be decreased after deforming at high temperature. How to obtain the optimize relationship of strength and ductility after SPF is one of the key problems for the process. In this paper, a set of artificial aging tests including single and two-step aging were carried out, which are the typical strengthening process for Al-Li alloy. Based on experimental results, strength and elongation were studied by means of tensile tests at room temperature, and the effect of aging processes on mechanical properties was analyzed. Finally, the microstructures fore and after aging were examined by OM and TEM, and the strengthening mechanism of 1420 Al-Li alloy was further studied. It is found that artificial aging especially two-step aging can increase mechanical properties of post-SPF material obviously, and δ (Al3Li) is the primary strengthening phase.
Structure and Performance of Chemical Duplex Plating Ti Metal Layer on Diamond Surface by Hydrothermal Method
Authors: Xiang Dong , Jia Li Qun , Liu Ke Gao
Published: June 2014

As a surface of diamond has a higher interfacial energy and worse binding force, the diamond shed from matrix easily. For solving this, the microstructures and properties of the metallic coating on diamond surface were studied. The different temperatures, such as 110, 120, and 130 °C for 6 h, were used for coating diamond in the high-pressure reactor respectively. The structure and performance of the metallic coating on diamond surface were tested by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and diamond compressive strength instrument. The results showed that a continuous and compact coating of Ni, W and Ti on the diamond surface is obtained by the hydrothermal coating technology (chemical duplex plating) at 120 °C. After heat treatment at 850 °C for 1 h, the better layer coatings form for protecting diamonds and reducing the trend of oxidize. Because the carbides of W and Ti present at the boundries between the coating and diamond surface, the combination of chemistry and metallurgy is gotten. The compress strength of diamonds after hydrothermal and heat treatment is higher than that of uncoated particles (those are 54.40% and 85.48%, respectively).
Development of Permanent Magnet Generator Used for Magnetic Field Assisted Micro Electroforming Technology
Authors: Li Hui Juan , Ming Ping Mei , Bao Xiao Hui , Zhang Xiao Dong , Bi Xiang Yang
Published: June 2014

To provide appropriately high and uniform magnetic field for micro electroforming process, a permanent magnet generator was specially developed which based on the fundamental process requirements. On the basis of determining the number of permanent magnet combinations numerically. Mainly, the geometrical shape of the permanent magnet blocks and magnetic circuit structure were optimized, and then the working gap regulating mechanism for this generator was designed. Utilizations indicated that the developed generator met the requirements well.
Influence of Heat-Treatment on Properties, Microstructure and Corrosion Resistant of Zirconium Sheet
Authors: Dang Peng , Zhang Xiao Wei , Wang Yun , Zhang Qing , Li Chang Liang
Published: June 2014

The influence of annealing temperature on the microstructure, mechanical properties and corrosion resistant of cold rolling zirconium sheet were studied in the manuscript. The experimental results shown that the tensile strength and yield strength of zirconium sheet were decreased and the elongationwas raised with the raising of annealing temperature from 500 °C to 580 °C. The recrystallization are not happened in zirconium sheet at the annealing temperature of 500 °C. Zirconium sheet complete recrystallized and the strength and elongation get a well match at the annealing temperature of 540°C. Zirconium sheet also complete recrystallized at the annealing temperature of 580°C but the crystalline grain has the tendency of growing. The annealing temperature has no effect on the corrosion resistant of zirconium sheet.
Carbonization Effect on Phase Structures of Zirconium Oxides with 2-3 Percent Yttrium
Authors: Xue Zhi Qin , Guo Yong Quan
Published: June 2014

Phase evolutions and structures of zirconium oxides with 2 percent yttrium before and after carbonization have been systemically studied with X-ray diffraction and Rietveld structural refinement. The carbonization decreases the structural stability of original ZrO2. According to the X-ray diffraction patterns, three phases with monoclinic, tetragonal and cubic structure coexist after carbonization. With increasing carbonizing temperature, the content of tetragonal phase in ZrO2 with 2% mol Y2O3 doped increases，however, the phase content of monoclinic phase decreases. The content of tetragonal phase in ZrO2 with 3% mol Y2O3 doped increases greatly after carbonization. It implies that carbonization is beneficial for the formation of ZrO2 tetragonal phase.
Comparisons of Explicit and Implicit Finite Element Methods for Sheet Metal Forming
Authors: Chen Lei
Published: June 2014

Sheet metal forming is one of the most commonly practiced fabrication processes in industry. Numerical simulations of the complex parts are possible by finite element method in the past thirty years. The most important problem of the simulation is the reliability of the model. Static implicit method (SI) and dynamic explicit method (DE) were used to simulation sheet metal forming process. It was found that simulation speed in dynamic explicit software has large effect on the simulation results. The best simulation speed is 5~10 m/s. Compared with the simulation and experimental results of thickness, draw-in and CPU time, the DE method is preferred.
Modelling Method for Preventing Thermal Runaway Reaction Accident of Thermal Reactive Material
Authors: Chu I Tien , Tsai Shu Yao , Huang Wan Tran , Tseng Jo Ming , Li Jin Shuh , Lin Chun Ping
Published: June 2014

Thermally reactive materials have caused many serious accidents involving storage and transportation, due to being thermally reactive. The safe storage and management of these materials still is a critical problem in many countries. We studied the thermal hazard of thermal reactive materials, such as a propellant, by employing differential scanning calorimetry (DSC) non-isothermal tests and isothermal tests, and then comparing the kinetic parameters by isothermal and non-isothermal of kinetics, avoiding the mistaken results of the single thermal analysis model. The chosen approach was to obtain reliable kinetics of thermal decomposition by safety and effective technology by modelling method, which acquired the safety parameters of storage condition that could be applied as thermal reactive materials safer design during storage safety conditions and relevant operations.
Thermal Structure Coupling Research and Thermal Fatigue Life Prediction of the Large Mining Machinery Brake
Authors: Liu Zhu Li , Zhao Min Min , Li Meng Li
Published: June 2014

This paper analyzed the temperature field of one large mining machinery disc brake during normal braking conditions in ANSYS. Basing on the sequential coupling methods, analyzed the brake disc's thermal stress distribution and changes. According to the analysis results, estimated its thermal fatigue life.
Study on the Response of Composite Material Cylinder with Metal Liner under Thermal Mechanical Impact
Authors: Xu Ya Dong , Chen Guang Song , Ma Jia
Published: June 2014

As to the composite cylinder with metal liner under the high temperature and high pressure, thermal mechanical coupling mechanism and response are studied. On the basis of equations for coupling thermal and mechanical impact load and the non-linear thermoelastic finite element equations, the 3-D analysis model of the composite cylinder is established by using the finite element method. The direct coupling analysis is conducted and the variation regularity of the dynamic stress field is obtained. The results show that the thermal mechanical impact loads can cause large transient stress, which influences the strength of the metal liner obviously.
A Semi-Analytical and Semi-Numerical Method for Acoustics Radiation Characteristics of Rotational Shells
Authors: Lu Jing
Published: June 2014

A semi-analytical and semi-numerical method is presented for analyzing the acoustics radiation characteristics of a rotational shell. Combining the dynamics control equation and the sound pressure expression, the vibro-acoustics equation of the rotational shell is formulated firstly. Then, a semi-analytical method is developed based on the superposition principle. The comparisons with the document show that the proposed method is accurate and efficient.
The Resistance Performance Influences from Hull Line Variation of V-Shaped Non-Ballast Ship (NoBS)
Authors: Elkady Hesham , Han Duan Feng , Gao Liang Gao
Published: June 2014

As a New Concept in Ship Design to be Alternative of Ballast Water System, to Emerge that Remedy the Introduction of Invasive Marine Species and the Disadvantages of Ballast Water Treatment Systems. the Non-Ballast Ship has been Studied Abroad, but it is Rarely Mentioned in China. in this Paper, the Hydrodynamic Influences due to Hull Line Variation of this Kind of Ships were Studied, Using the Method of Invariant Cross-Section Area Curve under the Design Draft to Change the Rise Angle at Bottom. then by Using Numerical Calculation, get the Resistance and Effective Power at each Angle.
Material Selection and Finite Element Analysis for the Enclosure of Mine Exploration Robot
Authors: Song Zhi Ying , Zhao Jian Yang , Jia Rui Qing
Published: June 2014

This paper focuses on materials selection and finite element analysis for flameproof enclosure of mine exploration robot. The internal environment of abandoned mine is unknown, thus the robot must be designed explosion proof. This research deals with a safe solution to environment exploration for abandoned mines by using mine exploration robot. Modeling by using 3D software and finite element analysis verifies whether enclosure strength satisfies requirements. It will provide a reference for the development of mine exploration robot.
Transmission Line Insulators Detection Based on KAZE Algorithm
Authors: Li Dan , Zhang Meng , Tong Zu Bing
Published: June 2014

Transmission Line obstacle detection technology is one of the hot spots of computer vision and transmission line inspection robot system.As the most common obstacle of inspection robot,correctly identify of insulators can help improve the reliability and accuracy of self-inspection. Low robustness of traditional detection algorithm can not meet the requirements on insulators detection when dealing with complex environment. To solve the above problem, a transmission line insulators detection method based on KAZE algorithm is given. The feature extraction is done in the nonlinear scale space, and feature vectors are formed with M-SURF algorithm, what’s more, feature vectors detecting is worked through the nearest neighbor algorithm as matching criteria and RANSC generated algorithm. Experimental results show that the effect of insulators detection algorithm based on KAZE detect faster and also make a good performance on accuracy and robustness.
Research of Power-On Detection in POE Topology
Authors: Han Zhao , Wu Jie , Dong Qing Yun , Ren Ke , Dong Juan
Published: June 2014

POE (Power Over Ethernet) realizes the multiplexing of power transmission and data transmission. To ensure the safety of power supply process, PD (Powered Device), when connected, must be detected by PSE (Power Sourcing Equipment). This article describes the methods of PD detection especially in the symmetrical architecture. The symmetrical architecture means that PSE and PD are connected and either of them can play a role of PSE or PD. In our new approach, signature resistance is replaced by signature capacitance. The connection of PD changes the capacitance load of the system, so the step response can be used to detect the change of capacitance load. This method requires zero static current, which reduces the system power consumption. The theoretical analysis, PSPICE simulation and the experimental results are given.
Design of a Sine Sweeping Constant Current Source Based FPGA and DDS
Authors: Yu Ya Ping , Zhao Hui , Liu Yuan , Yang Ren Jie , Dong Gui Mei , Xing Yuan Shuai
Published: June 2014

This paper designed a range of 0.1 ~ 250 kHz sine wave sweeping constant current source, which sine wave generator based on FPGA chip and DDS technology, the desired sine wave frequency was obtained by controlling the frequency control words. Low-pass filter circuit was realized by using the LTC1560-1, conversion circuit from the voltage to the current was consisted of a Howland current pump. The constant current source shows a good spectral impedance purity and amplitude.
The Application of Improved Dynamic Decision Tree Based on Particle Swarm Optimization during Transportation Process
Authors: Li Xin Hai , Li Li , Fu Xing
Published: June 2014

For the relationship of environmental parameters and variables in the each transport process, by using data mining, the system gets the corresponding decision tree. In a certain environment parameters conditions, the occurrence of the event is determined by the decision tree. Through the No Free Lunch Theorem (NFL) revelation, the original PSO algorithm is improved to enhance the validity of the original decision tree. To the final experiments results, once again demonstrate the improved algorithm is efficient.
Effect of Ethanol Composition in Water Coagulation Bath on Structure and Performance of Homogeneous-Reinforced Polyvinyl Chloride Hollow Fiber Membranes
Authors: Liu Hai Liang , Xiao Chang Fa , Huang Qing Lin , Fan Zhi Li , Hu Xiao Yu , Shu Wei , Huan Guo Lan
Published: June 2014

Homogeneous-reinforced (HR) polyvinyl chloride (PVC) hollow fiber membranes consisting of coating layer and matrix layer were fabricated via coating process. The mixtures of polymer solutions were uniformly coated on the homogeneous PVC matrix membrane which was prepared by melt-spinning method. The influences of ethanol composition in water coagulation bath on structure and performance of HR membranes were investigated. The results showed that the pure water flux of the HR PVC hollow fiber membranes increased with the increase of ethanol weight fraction in coagulation bath, while the porosity changed slightly. The increase of ethanol weight fraction in coagulation bath brought about the decrease of the protein permeation flux and rejection rate. The tensile strength of HR PVC hollow fiber membranes was about 9.5 MPa, while the elongation at break was higher than 97 %.
The Shapes of Products and the Lifestyle with Slow Rhythm
Authors: Guo Lin Sen
Published: June 2014

The lifestyle with excessively quick steps can exert influence on health, and the excessive consumption and the essence of life run in the opposite direction. The lifestyle with slow rhythm objects against the excessive consumption and wasting, and advocates the simplified and humanized design, which has something in common with the appropriate laying down put forward in Chinese Buddhism. Its the highest wisdom to lay down the design with little improvement to the life quality and those unhealthy lifestyles.
Discussions of Resource Utilization of Coal Gangue
Authors: Li Hua Min
Published: June 2014

The ways of using coal gangue in electricity generation, chemical utilization and building-material production are introduced and national coal gangue utilization status and development trend is analyzed in this paper. Pointing out the main problems in present utilization of coal gangues, suggestions on coal gangue resource utilization are given that provide reference for eliminating coal gangue pollution, enhancing environmental protection and saving up energy.
The Mineral Characteristics and Occurrence of Gold in Nali Gold Deposit, Guangxi
Authors: Li Zhi Wen , Liu Cheng Dong , Zhao Xuan Qing , Lu Jian Hui , Guo Guo Lin
Published: June 2014

Using the analysis techniques of polarizing optical microscope and electron probe, mineral composition, ore texture and structure and the occurrence of Au in the primary ore are studied. The research shows that the main ore minerals in the ore include realgar, pyrite and arsenopyrite etc. Sulfur-stibarsen is the main carrier of Au, and is the major associated mineral of realgar, surrounded mainly by realgar, and partly is the associated mineral of arsenopyrite. The existence of visible gold and microscopic gold in the ore of this mining area can be excluded, and the gold might exist mainly in the form of inclusion gold, which is the so-called “nanoAu”.
Multilayer Film through Inclusion Complexation
Authors: Liu Chun Yuan , Lin Wei In
Published: June 2014

In addition to traditional PEM and hydrogen-bonding methods, a polymer multilayer film could be formed via inclusion complexation,. We demonstrate this layer-by-layer method. Due to the steric hindrance of polymer segments, the thickness levels off and is generally much higher than those from PEM and hydrogen-bonding.
Preparation and Characterization of Bipolar Membranes Modified by Adding Multi-Carboxylic Metallophthalocyanine Derivatives into the Cation Layer
Authors: Lu Min , Hu Yan Yu , Chen Ri Yao
Published: June 2014

The multi-carboxylic metallophthalocyanine derivatives were added into carboxymethyl cellulose cation layer to prepare the modified carboxymethyl cellulose/chitosan bipolar membranes (CMC/CS BPMs), which were characterized using electric universal testing machine, contact angle measurer and so on. The results showed that the mechanical properties were increased after modification. Moreover, the ion exchange capacity, and the hydrophilicity of the modified CMC membrane dramatically rose. As the catalytic centers, the metallophthalocyanine derivatives sped up water splitting, decreased the membrane impedance and cell voltage. In comparison with the BPMs modified by mononuclear metallophthalocyanine derivatives, the catalytic ability for water splitting of the binuclear metallophthalocyanine derivatives (especially with different central metal ions) was enhanced. At the current density of 60 mA·cm-2, the cell voltage of the BPM modified by FeCoPc2(COOH)12 was only 5.3V.
Substrate Dependence of Microcrystalline Silicon Growth with SiH4 Diluted by Ar
Authors: Cheng Hua , Qian Yong Chan , Xue Jun
Published: June 2014

Microcrystalline Si films were deposited by electron cyclotron resonance plasma-enhanced chemical vapor deposition (ECR-PECVD) using Ar diluted SiH4 gaseous mixture. The effects of the substrate on deposition rate, preferred orientation and roughness of the films were investigated. The results show that, the influence of the substrate surface chemical nature on the deposition rate is significant in the initial stage of the growth. And considering the crystallinity and roughness of the films, the substrate is favored in its preferred orientation with a rougher surface. Based on these results, it is confirmed that the combination of diffusion and etching is indispensable to describe the deposition of μc-Si with SiH4 diluted by Ar, and the mechanism of μc-Si growth could be controlled by diffusion of Si and etching of the Ar+ on the film surface.
A Facile Method to Preparation of Amphiphilic Perylene Tetracarboxylic Diimide/ZnS Hybrid Nanocomposites and Improved Semiconducting Property
Authors: Song Jin Gang , Wang Hong Yan , An Nian Shuai , Chen Yan Li
Published: June 2014

A self-assembled film of an amphiphilic perylene tetracarboxylic diimide derivative (N-hexane-N'-(1-phenyl-4-aminoethanol)-1,7-di (4-tert-butylphenoxy) perylene-3,4;9,10-tetracarboxylate diimide, HH-PDI) has been used as the organic template to produce the first example of monodispersed nanoparticles of HH-PDI/ZnS composites. The HH-PDI pure film and HH-PDI/ZnS nanocomposites were characterized by UV-vis absorption, X-ray diffraction (XRD), scanning electron microscopy (SEM) and current-voltage (I-V) measurements. Experimental results revealed the film crystallinity and general molecular order for HH-PDI molecules in the nanocomposites are improved effectively in comparison with those in the pure film due to the introduction of ZnS nanocrystals. The electrical conductivity of the HH-PDI/ZnS nanocomposites (6.6×10-5 S cm-1) is more than ca. 2 order of magnitude higher than that of (3.6×10-7 S cm-1). The present result provides an efficient way to improve the performance of organic semiconductors through introducing inorganic semiconducting nanocrystals.
Mechanical and Thermal Properties of Siloxane Reinforced Biphenyldiol Formaldehyde Resin Curing Epoxy Resin Composites
Authors: Chen Shi Hui , Gao Jun Gang , Han Hong Zhe , Wang Chao
Published: June 2014

In order to modify the properties of the epoxy composites, an alkali catalyzed biphenyldiol formaldehyde resin (BPFR) was synthesized and used to cure epoxy resin (ER). γ-Glycidoxypropyl trimethoxysilane (KH-560) was used as a reinforcer of the composites. Laminates of the BPFR/ER fiberglass reinforced composites with different (KH-560) contents were prepared. The influence of the KH-560 content on the glass transition temperature (Tg) and thermal degradation properties of the composites was researched by dynamic mechanical analyzer (DMA) and thermogravimetric analysis (TG). The mechanical, electrical properties of the composites were determined. The results showed that the interfacial bonding strength between resin matrix and fiberglass can be efficiently improved with the presence of KH-560. When the ratio of BPFR and ER is 3 : 7, the content of KH-560 is 5 ~7 wt%, the impact resistance of the fiberglass reinforced composites is 61.35~78.59 kJ/m2, the tensile resistance is 150.37~162.54 MPa, which are all 30 % higher than that of no added; The dielectric constant ε and dielectric loss tanδ of the composites is between 0.50~0.68 and between 0.008~0.01, respectively.
Study on Tensile and Impact Performance for the MWCNTs/EP Composite
Authors: Yan Fei , Fu Jing Wen , Zhao Dong Yu
Published: June 2014

In this paper, multiwalled carbon nanotubes (MWCNTs)/epoxy resins (EP) composite was prepared by situ polymerization. MWCNTs/EP composites were prepared with different content of MWCNTs. The study of morphology and properties showed certain content of MWCNTs can well homogeneous dispersed in EP. Since of interface interaction between MWCNTs and EP, the glass transition temperature (Tg), strength and toughness of MWCNTs/EP composites were improved. Compared to the neat EP, composites prepared with 10 wt% MWCNTs showed 20 °C rising in Tg and nine orders of magnitude reduce in volume resistivity. The percolation thresholds between 4 wt% and 6 wt% are observed. Compared to the neat EP, composites prepared with 6 wt% MWCNTs showed with 83 % increase in tensile strength, 83 % increase in elastic modulus and 89 % increase in impact strength.
The Natural Rubber/Zinc Oxide Nanocomposites: Its Morphology, Mechanical and Thermal Decomposing Properties
Authors: Lv Ming Zhe , Fang Lei , Li Pu Wang , Yang Chun Liang
Published: June 2014

Natural rubber /Zinc Oxide (NR/ZnO) nanocomposites are fabricated by blending natural rubber latex with aqueous suspension of nanoZnO particles. Its morphology and thermal/thermooxidative ageing resistance are investigated with scanning electron microscopy (SEM) and thermogravimetric analyzer (TGA). The results show that the mechanical properties of NR is greatly improved by the incorporation of nanoZnO, nanoparticles, which are homogenously distributed throughout NR matrix as nanoclusters with an average size of 80 nm when the ZnO loading is less than 4 wt%. The thermal/thermooxidative aging resistance of NR/ZnO nanocomposites is compared to the pure NR. It is found that the introduction of nanoZnO has no obvious impact to the thermal decomposing properties of NR matrix. ZnO/NR composites possess excellent antibacterial effect.
Preparation of Ethanol-Sensing Gas Sensor Based on PECH/Multi-Wall Carbon Nanotubes Sensitive Films
Authors: Yao Wei , Xie Guang Zhong , Tai Hui Ling , Jiang Ya Dong , Zhou Yong
Published: June 2014

Abstract: In this paper, Polyepichlorohyron(PECH)/multi-wall carbon nanotubes(MWCNTs) composite films and PECH/multi-wall carbon nanotubes twolayer film were deposited on interdigitated electrodes by airbrush technology to detect ethanol vapor of various concentrations at room temperature. Thickness and structure of the film were taken into account, so films of different thicknesses and with different structures were prepared respectively. The responses of the sensors to ethanol showed that composite film had a higher response thantwolayer film, and the thick composite film performed better than its counterpart when they were exposed to ethanol vapor.
A Novel Route to Prepare Titanium Doped Mesoporous Carbon
Authors: Tian Hao , Zhang Yan , Liu Yun Jiang
Published: June 2014

A series of titanium doped ordered mesoporous carbons (Ti-OMCs) were prepared by employing titanium modified resol as source for the first time. The effect of titanium content and F127 content on the microstructure of Ti-OMCs was investigated by X-ray diffraction (XRD), N2 sorption isothermal and Transmission electron microscopy (TEM). The results showed that regularity of products decreased with the increase of titanium content. A mesophase transformation from 2-D hexagonal (P6mm) to body-centered cubic () structure can be achieved by decreasing F127 content.
Assessments of Impurity Diffusion Coefficients of Selected Pure Metals in Fcc Fe
Authors: Hu Xian Xian , Lu Xiao Gang , He Yan Lin
Published: June 2014

Abstract: The atomic mobilities for impurity diffusion of Al, Au, Co, Cu, Mn, Mo, Nb, Ni, Pt, Sn and Zn in fcc Fe have been critically assessed based on the experimental diffusion coefficient data available in the literature. The impurity diffusion coefficients calculated from the atomic mobilities agree reasonably well with the reliable experimental data. This work provides a helpful guidance for the establishment of a general Fe-based mobility database to design new Fe-based alloys for practical purposes.
The Properties of a Novel Green Long Afterglow Phosphor Zn2GeO4:Mn2+0.01, Pr3+0.01
Authors: Wan Min Hua , Wang Yin Hai , Wang Xian Sheng , Zhao Hui , Hu Zheng Fa , Wang Cheng
Published: June 2014

The sunlight-excited red long afterglow phosphor ZnGa2O4:Cr3+ was prepared by the high-temperature solid state reaction. The emission lines around 690nm all originated from 2E→4A2 of Cr3+ ions. The long-lasting phosphorescence (LLP) spectra indicated optimal long-lasting luminescence could obtain from ultraviolet (UV) light excitation. The thermoluminescence (TL) curve implied different depth of trap was caused by the dopant ions. The initial persistent luminescence was caused by the recombination between the captured electrons and Cr3+ ions, and this recombination process was accomplished through the conduction band. The linear dependence of the long afterglow intensity versus time in the decay curve maybe implied a new recombination mechanism.
Dy3+ Doping Blue-Green Sr4Al14O25:Eu2+ Phosphor for Enhancing Luminescent Properties and the Mechanism Study
Authors: Kong Zhe , Wang Hong Bo , Zhang Er Pan , Qiu Tao , Zhang Jun , Ji Zhen Guo
Published: June 2014

Dy3+ doped blue-green Eu2+ doped strontium aluminate (Sr4Al14O25:Eu2+) phosphor was prepared using a high temperature solid state method and the influence of the doped Dy3+ on the luminescent properties was studied using X-ray diffraction, scanning electron microscopy, fluorescence spectroscopy and a series of other characterization methods. It is found that Dy3+ doping can enhance the luminescent intensity and extend the afterglow time. The luminescent mechanism of rare earth ions doped strontium aluminate phosphor was also discussed deeply, the effects of the doping amount on the luminescent properties has been made detailed explanation and description. This work has important theoretical significance for the development of higher brightness and longer afterglow blue-green phosphors.
Magnetic and Electrical Property in Mg2+ Deficient La1.4Sr1.6Mn2O7 Perovskite
Authors: Zong Yun , Zhao Xu , Chen Wei
Published: June 2014

The nominal compositions of La1.4Sr1.6-xMgxMn2O7 (x=0, 0.1, 0.2, 0.3, 0.4) have been synthesized using solid-state reaction method. The XRD analyses show that the x=0 compound is pure I4/mmm tetragonal bilayered perovskites phase, while they are mixture of an orthorhombic ABO3-type perovskite and tetragonal bilayered perovskites for x=0.1, 0.2 and 0.3). When x is 0.4, the compound is pure orthorhombic ABO3-type perovskite. For lightly doped samples (x=0.1 and 0.2), the Curie and Nair temperature decreases with the increasing Mg2+ doping, while the metal-insulation transformation temperature is 90K and 140K, respectively. For heavy doped samples (x=0.3 and 0.4), the magnetic property shows spin-glass state, and the resistance increases nearly 4 order of magnitudes.
Ultra-Multilevel-Storage Phase Change Memory
Authors: Yin You , Hosaka Sumio
Published: June 2014

In this study, we investigated ultra-multilevel-storage (UMLS) in lateral phase change memory (PCM) on the basis of device structure, reliability and programming method. We found that the number of resistance levels was limited strictly by the number of PC layers in multilayer multilevel cell (ML-MLC). A number of distinct levels up to 16 were obtained using a simple single-layer multilevel cell (SL-MLC). And material engineering is expected to greatly improve the reliability of MLS. We believe that fast-freely-achievable (FFA)-MLC by stair-like-pulse programming is a very promising method for futures application.