bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation and Characterization of Plasma Treated Melt-Blown Polypropylene Nonwovens Grafted with Acrylic Acid
Authors: Wang Dan , Xu Qing Yan , Chen Yue Jun , Xu Hua Jun , Wang Yi Min , Wang Yan Ping
Published: June 2014

The melt-blown polypropylene nonwoven fabric plasma treated to graft with acrylic acid has been investigated by FTIR, SEM and Contact Angle Determinator respectively. It was found that after grafting with acrylic acid the wettability of the PP nonwoven fabric could be significantly improved from 140.9°to almost 0°in a short period of time by plasma treatment and increased to 110.6° and 133.2° after 20 days and 40 days respectively. However, the wettability of acrylic acid grafted PP nonwoven fabric could be improved to 72.9°with a permanent hydrophilic behavior.
Analysis of Hydraulic Prop High Frequency Induction Cladding Temperature Field
Authors: Zhu Fu Dong , Zhu Bi Yun , Liu Bin
Published: June 2014

The temperature field of mobile column is simulated, with the theory of high frequency induction heating and fourier heat conduction law , to analyze the change law of the temperature field with time, with different cladding parameters. The results show that the induction heating speed is mainly affected by power frequency of high frequency induction heating and cladding current. The higher frequency induction heating power is or the larger the cladding current is, the the faster the surface temperature of hydraulic prop is rising, the lower the inside-wall termperature and the less influenced the matrix is. The effect and the efficiency of cladding is comparatively superior when cladding frequency is 250KHz and current is 1160A.
Characterization of Local Cavity Pressures in Squeeze Casting of Magnesium Alloy AM50
Authors: Zhang Xue Zhi , Yu Alfred , Hu Henry
Published: June 2014

In this study, the experimental measurement of the pressure distribution in a cylindrical die cavity for squeeze casting of magnesium alloy AM50A was carried out. Piezo-electric quartz pressure transducers were integrated into a die cavity for real-time pressure measurements. The experimental results revealed that local cavity pressures at various locations changed with time in the duration of squeeze casting solidification and cooling. The pressure transfer rate varied considerably within the casting geometry. The distribution of local cavity pressures was inhomogeneous in the cavity.
A Research on Optimization of Cutting Parameters Based on NSGA-II
Authors: Liang Xiao Zhen , Yan Guang Rong , Chu Hong Zhen
Published: June 2014

In this paper, we take the CNC milling on as the object of the research and establish an optimized model of cutting parameters by using algorithms based on NSGA-II. Taking the machining time and the surface roughness as target function, and the rotational speed and cutting power as constraint condition, the optimization of a CNC milling case is realized, and is verified by simulation of cutting using CAXA ME and Vericut. The outcome confirms the truth that NSGA-II is a useful technique in the optimization of cutting parameters.
Behavior of Microwave Heating of 316 Stainless Steel Green Body
Authors: Li Zhi Wei , Jiang Kai Yong , Wang Fei , Zhang Ji Liang
Published: June 2014

This paper mainly introduces the mechanism of microwave heating: electric conduction loss, eddy current loss and arc discharge. The microwave heating behavior of 316 stainless steel powder body which made by gel casting was investigated in the paper. Experiments on different microwave power, powder particle size, and the content of auxiliary heating material showed that the smaller the powder particle size, the larger microwave power and auxiliary heating materials help 316 stainless steel body for sintering.
Preparation of C@ZrSiO4 Inclusion Pigment Using Compound Colorants via Non-Hydrolytic Sol-Gel Method
Authors: Xu Xia Yi , Jiang Wei Hui , Chen Ting , Liu Jian Min , Miao Li Feng , Zhang Xiao Jun
Published: June 2014

C@ZrSiO4 inclusion pigment was prepared by using commercial carbon black RX8002C and phenolic resin (PF) as compound carbon source via non-hydrolytic sol-gel (NHSG) process. The RX8002C carbon could well disperse in phenolic resin solution, which developed a compound carbon source after calcination. Dense ZrSiO4 layer was coated on the carbon surface as a protector. The structure and morphology of samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The chromatic value of the pigments was measured by the CIE color system. The results show that the compound colorants can be well coated by ZrSiO4 dense layer to develop a black inclusion pigment. When the compound proportion is 1:4 and the compound colorants amount is 4wt.%, the chromatic value of the C@ZrSiO4 inclusion pigment is 27.54.
Effects of Environment Temperatures on the Microstructures and Mechanical Properties for Welding Joints of A5083-H111 Alloy
Authors: Wang Chuang Gang , Liu Yan , Wang Xiao Min , Gou Guo Qing , Chen Hui
Published: June 2014

In this paper, A5083-H111 aluminum alloy was welded under different environment temperatures. Microstructures and mechanical properties were analyzed. The results show that the grain size of precipitated phase in welded seam deceased and the content increased with the increase of environment temperature. The hardness was the lowest in welded seam. The hardness increased with the distance away from welded centre. The hardness of welding zone of welded joint was generally low below 0 °C. The strength and toughness were higher at welding temperature above 0°C than that welded below 0°C. If the welding parameters were well controlled, A5083-H111 Al alloy can be welded at temperature ranging from-20°C to 40°C with relative humidity of 50%.
Research on Forming Accuracy of Two Point Incremental Forming for Aluminum 1060
Authors: Wang Qiu Cheng , Hu Hai Han , Wu Jin Han , Cao Jiang
Published: June 2014

Two point incremental forming is proposed to form the thin sheet into the desired shape in this paper. The forming accuracy of two point incremental forming is compared with single point incremental forming for Aluminum 1060. Then the forming accuracy is measured by FARO three coordinates measuring instrument. And a new method is proposed to analyze forming accuracy quantificationally. The experimental results show that the forming accuracy of two point incremental forming is obviously higher than single point incremental forming.
A Servo Control System Based on Fuzzy PI Method for Transverse Flux Machine in Mechanical Press
Authors: Xie Jia , Gao Ai Lin , Wu Yan Xiang , Gao Zhong Yong
Published: June 2014

A control method for servo control system of Assembled Claw Pole Stator Transverse Flux Machine(ACPTFM) by controlling the armature current Root-Mean-Square (RMS) and the angle between armature current and no-load EMF is proposed in this paper. The servo control system of ACPTFM is composed of a series of closed-loop controllers, and the most complexity design of speed controller is described in detail. Fuzzy adaptive PI control method which integrates the advantages of fuzzy control and PI control is adopted to design the speed controller. Experimental results show that it can improve the system dynamic response and steady state accuracy.
Deformation Behavior of Aluminum Alloy Tube in Semi-Dieless Metal Bellows Forming Process with Local Heating Technique
Authors: Zhang Zi Cheng , Manabe Kenichi , Furushima Tsuyoshi , Tada Kazuo , Sasaki Osamu
Published: June 2014

The metal bellows are used in a large number of industrial applications for their flexile and elastic properties. For the traditional manufacturing methods for metal bellows, the dies and (or) tools are required. It is inconvenient to change the shape of metal bellows and also leads to the high cost. To reduce the manufacturing cost and produce the metal bellows with various shapes, the semi-dieless metal bellows forming process was proposed. The deformation behavior of aluminum alloy tube in semi-dieless bellows forming process was investigated in the study. The effects of compression ratio, heating length on the convolution height, pitch of bellows during the semi-dieless bellows forming process were studied. The results showed that the deformation conditions of semi-dieless forming process have significant influences on the shape of aluminum alloy bellows and deformation behavior of aluminum alloy tube in the forming process. The increase of compression ratio, heating temperature and heating length resulted in the increase of pitch and decrease convolution height of aluminum alloy metal bellows.
Properties of X80 Pipeline Girth Welds for Different Welding Procedures
Authors: He Xiao Dong , Tong Ke , Liang Ming Hua , Zhu Li Xia , Lin Wei Ping
Published: June 2014

The X80 girth welds were produced by solid-wire gas metal arc welding (GMAW) and shield metal arc welding (SMAW) using two welding consumables respectively, which contained different mass fraction of C, Mo and Ni. The tensile properties, notch toughness, hardness, and microstructures of welded joints were evaluated. The results indicate that high strength and good toughness of welded joints can be achieved. But the tensile properties of all weld metal of GMAW and SMAW process were evidently different because of the difference of mass fraction of C, Mo, Ni. The strength reduced slightly in softening zone of HAZ. Using welding consumable which contain higher Mo additions, the microstructure in filler weld and fusion zones were IAF+GB and GB+M respectively. Furthermore, the mechanical properties of X80 pipeline welded by single wire welding and double wire welding respectively have been compared. The double wire welds exhibited lower yield strength but higher toughness compared to the corresponding single wire welds.
Investigation of Porous Defects in Spray Formed 7XXX Aluminum Alloy
Authors: Yin Yi Bin , Zhang Yong An , Xiong Bai Qing , Wang Feng , Liu Hong Wei , Li Zhi Hui , Li Xi Wu
Published: June 2014

In this work, Al-10.8Zn-2.8Mg-1.9Cu alloy was manufactured by the spray forming technique. The microstructure of the spray-formed alloy was investigated by optical microscopy and field emission scanning electron microscopy. The results indicated that the porosity in the spray-deposited alloy was mainly composed of interstices, interconnected pores and gas pores. The distribution and types of porous defects were different, responding to position of the preform.
Potential Spark Erosion Approaches to Silicon Nanoparticles Production
Authors: Farooq Ahmad , Wang Wei
Published: June 2014

This article demonstrates potential approaches to the production of Silicon Nanoparticles (SiNPs) using spark erosion in forms of Wire-EDM (WEDM), Die-sink and Micro -EDM. Utilizing the data from research work on such conventional spark erosion approaches, a novel method of nanoparticle production called high pressure flushing spark erosion has been introduced in this paper. This is an automated prototype machining system that utilizes deionized water sprayed @ 0.8 MPa through a rotating copper tool, boring on boron doped silicon ingot workpiece. SiNPs comprising an average diameter of 50nm were generated with approximate productivity of 1.5g/hr. The results demonstrate that the process holds excellent potential as an industrialized SiNPs preparation method in terms of size and productivity.
Energy Consumption Discussions of Porcelain Produce with Operating Conditions in a Simplified Model
Authors: Yu Jun Liang
Published: June 2014

Porcelain produce is a very high energy consumption process. According to total energy balance analysis, a variety of operating conditions are analyzed for effect of net energy consumption. One real porcelain plate produce process is introduced as the reference case. Operating conditions are defined in three parameters, which are air excess number, fuel distribution and solid mass ratio. A simplified model based on finite difference method (FDM) is solved to calculate axial gas and solid temperature profiles and net energy consumption. The net energy consumption in porcelain produce is calculated and discussed in quantity with three operating conditions above separately. Finally, it is concluded that net energy consumption is higher with bigger air excess number and solid mass ratio, while fuel distribution will have no influence on net energy consumption.
Microstructure and Mechanical Properties of Submerged Arc Welding Filled with Ni Wire Dissimilar Joints Comprising SUS304 and Q245R
Authors: Zhang Peng Xian , Zhao Peng , Cui Yan Quan
Published: June 2014

Aim at the issue that the bending crack is easy to generate inside dissimilar welded joint of low alloy steel and stainless steel, a new process of submerged arc welding filled with Ni wire is put forward. The influence mechanism of filling quantity of Ni wire to the joint of microstructure evolutions and mechanical properties is mainly explored based on the contrast test of non-filling Ni wire and three different filling speeds of Ni wire. The experiment results indicate that, the filling process of Ni wire supplies austenite forming element, and alters heat allocation process of molten pool. The filling quantity of Ni wire is the quantitative parameter, it is used to control the transition width between low alloy steel and weld metal, also to adjust the peak temperature and holding time at elevated temperature of molten pool. When the value of the filling quantity of Ni wire is determined, the problem of bending crack in the fusion zone of low alloy steel can be solved, and also the overheat damage can be eliminated. At the same time, the grains of weld metal and heat affected zone are refined. And on this basis the plasticity, toughness and microhardness of welded joint can be guaranteed.
The Behavior of Second Phase Particles in a Ti-Nb Microalloyed Steel during Welding Thermal Cycle
Authors: Chen Mao Ai , Wu Chuan Song
Published: June 2014

The behavior of second-phase particles in a microalloyed steel during weld thermal cycle has been investigated using analytical electron microscopy. All the particles in the base metal contains Nb and Ti, and the Nb weight fraction of the analyzed particles ranged from 0.22 to 0.85. During the heating stage of the weld thermal cycle, the small particles which were rich in Nb disappeared through complete dissolution and the large particles survived the weld thermal cycle with Nb weight fraction decreased. With a high cooling rate (t8/5 no greater than 60s), only heterogeneous re-precipitation occurred during cooling. With a low cooling rate (t8/5 = 120s), homogenous re-precipitation also occurred, producing a large number of small Nb-rich particles during cooling.
Multi Response Optimization of Carbon-Carbon (C/C) Drilling Parameters by Using Grey Theory Technique
Authors: Krishna Sastry K.V. , Rao V. Seshagiri
Published: June 2014

The objective of this paper is to determine the optimum values of drilling parameters of carbon fibre reinforced carbon (CFRC) composite material with the help of an experimental investigation, which includes the application of unique Grey theory method. The growing application of CFRC composites, which are popularly known as ‘carbon-carbon’ composites in Aerospace, Automobile, Defence and other advanced industries has prompted research studies to develop drilling technology of these special materials. The present work demonstrates the optimization process of multiple responses.The optimum values of drilling characteristics of these composites are calculated by the application of Taguchi method in combination with Grey Relational Analysis technique. The drilling experiments were carried with a High speed steel tool on a plate of carbon-carbon composite material on a CNC Drilling vertical Machining centre.
Application of Multidisciplinary Design Optimization in the Casting Process Optimization
Authors: Wang Ming Zhi , Chen Gang , Zhou Zhi
Published: June 2014

Casting process optimization usually includes modifying the mold structure, regulating the pouring temperature, changing pouring time, etc., which involves the mold structure optimization, but also involves optimization of temperature field. In order to get a better process conditions, it will generally make multiple simulation test under the different processes conditions. Many parameters should be set in each simulation test. In order to make casting engineers get liberation from a lot of repetitive work, multidisciplinary design optimization technology is firstly brought into the field of casting, successfully achieved ProCAST integrated into iSIGHT. The method of sample points collected is used in Optimal Latin Hypercube Design, and the building of approximation models is based on Kriging Model. On this basis, the optimization of the objective function is applied to Multi-Island Genetic Algorithm to obtain a global optimal solution. Compared to the verification result of the corresponding simulation, the relative error of the global optimal solution is 0.47%. The result of optimization is ensure average shrinkage rate of casting a smaller value when technological yield of the casting from 54.6% of the existing production case up to 61.1%.
Analysis of the Common Causes of Papermaking Cast Iron Dryer's Defects and the Study of Test On-Line
Authors: Li Wen Wei , Du Qing , Li Wei Zhong
Published: June 2014

The existing researches only put forward the stress concentration portion and design improvements from the perspective of stress analysis, or conducts safety assessment on dryers with the methodology of fracture mechanics, without non-destructive testing methods. Based on over 3,400 tests on cast iron dryers in Hangzhou, an ultrasonic testing technology with longitudinal wave double crystal probe is developed in the present investigation. This study illustrates how to identify the volume defects through testing on the air holes, shrinkage cavities and inclusions in the dryer cylinder and small R transition zone with longitudinal wave double crystal probe at a small angle (5°), as well as plane defects with deep cracks through testing on the dryer cylinder and small R transition zone with longitudinal wave double crystal probe at a large angle (42°). It addresses the issues of how to measure the thickness in regular online testing for cast iron dryers, to calculate the intensity or compare with the design value, to identify low hardness value, to determine the key parts in online testing, and how to conduct safety assessment on the cast iron dryers with small cracks. This technique may resolve various problems in cast iron dryer testing.
Reserch on a NOx Emission Forecasting Method Based on Naïve Bayesian
Authors: Lin Zhang , Xin Wang , Qi Zhang
Published: June 2014

Increasingly serious environmental pollution,trying to find a effective method to control NOx emission become more importance. Under this background, this paper adopts the naïve Bayesian classifier method which built on the basis of the probability density function to forecasting the NOx emission of diesel engine. This paper proposes a new approach to weight the super-parent one dependence estimators, and uses the UCI datasets to verify the validity of the proposed method. Finally, apply this diagnosis technology to the collected WD615 diesel engine data. The comparison experiments with other algorithms demonstrate the effectiveness of the proposed method.
Establish the Load Distribution Model for Vertical Mill Grinding Roller in Width Direction
Authors: Ye Ping , Ye Shu
Published: June 2014

The width of the grinding rollers are far greater than the arc length of the compaction zone in the circle view direction of the roller, and the actual wear of the mill roll surface also appear in the width direction. Therefore, it is helpful for analyzing the load distribution in the width direction of the grinding rollers, to clarify the state of mill work, and understand the non-steady-state vibration of the mill.
Research on Material Structure, Appearance and Color Design and Application of Humidifiers - With Student Consumers as Research Objects
Authors: Nie Xiao Li , Ouyang Chao Ying , Ning Li
Published: June 2014

The winter in northern China is cold and dry. With the centralization and generalization of heating devices, people have become more and more aware that dry environment does not only cause loss of water in the body, but also breeds numerous germs threatening health. In response, humidifiers are created. The widespread use of air-conditioners because of climate has accelerated the development of humidifiers. Although it is expanding, the potential consumer market of humidifiers has not been fully developed as the designers ignore students who are believed to be a big consumption group. This paper touches three aspects of humidifier design: material, appearance and color. According to the research, the humidifier market is believed to be better developed if humidifiers are designed to meet students’ consumption concept by taking care of the three aspects.
260t Ladle Stress and Deformation Finite Element Analysis
Authors: Sun Yan Ping , Zhang De Chen , Yang Ming , Li Yuan
Published: June 2014

In this paper, iron ladle stress and deformation has been accurately calculated using finite element analysis software ANSYS based on 260t iron ladle in standing, lifting, tipping working conditions. Distribution of stress field was obtained. The stiffness and strength of the iron ladle has been evaluated. The results show that the iron ladle in the standing, lifting and tipping working conditions, structural deformation is small, the strength and stiffness meet the requirements. This research extends the working life of 260t iron ladle. It provides theoretical basis for producing and using of the iron ladle and further optimal designing.
Relationship between the Textures and the Elastic Moduli of Electron Beam Welded Joint in Ti-6Al-4V Titanium Alloy
Authors: Li Xing Zhi , Hu Shu Bing
Published: June 2014

The microstructure, texture and elastic modulus of electron beam welding joint in Ti-6Al-4V titanium alloy were investigated by transmission electron microscopy, X-ray diffraction, electron back scattered diffraction and nanoindentation techniques. The α phase was in the majority, and a {0001} <-2110> texture of α phase was observed in the base material. A very weak {11-23} <-1-122> texture of α phase was in the fuse zone. Most of the α grain boundaries in the fuse zone were high-angle boundaries by electron backscattered diffraction, and it also confirmed that the orientations of α phase had a nearly random distribution in the fuse zone. The maximum average elastic modulus value measured by the nanoindentation techniques was in the base material due to the effect of the {0001} <-2110> texture. The average elastic moduli of three different zones in the joint were 134.8±3.5Gpa, 125.5±5.8Gpa and 123.0±4.7Gpa, respectively.
Investigation of the Influence of Geometric and Technological Factors on the Stress-Strain State of Metal in the Implementation of the Combined Rolling-Pressing Process
Authors: Lezhnev Sergey , Panin Evgeniy
Published: June 2014

In the development of new technology metal forming the main purpose is improvement the quality of the source material. The main aspect of quality improvement is increasing the strength characteristics. Often to increase the strength of deformable metal should be given reduced grain structure, up to subultra and even nanolevel. There are several ways to obtain sub-ultra-fine-grain structure of metals, and one of those ways is a method of severe plastic deformation (SPD), implemented in the whole volume of the deformable metal.In this work computer modeling was performed of the combined process "rolling-pressing" with the use of grooved rolls and equal channel step matrix with varying basic geometric and technological factors which have a significant impact on the process, what was made for the analysis of the impact of various factors on the stress-strain state of the process.
Influences of Material Parameters on Terminal Effect of PELE with Tungsten Fiber Composite Jacket
Authors: Zhu Jian Sheng , Fan Zhi , Gao Bin
Published: June 2014

There are a series of disadvantages in tungsten alloy (TA), which is adopted as the jacket of PELE widely at present, such as inadequate obdurability, uncontrollable shape and amount of fragments, imperfect lateral damage effect, and so on. To solve the problem, tungsten fiber composite (TFC) is brought forward to produce PELE jacket. In order to verify its feasibility, numerical simulations are carried out on PELE impacting armor steel target with TFC jacket. The simulation results are compared with that of PELE with TA jacket and the reasons that the penetrating performance and lateral damage effect of PELE with TFC jacket being superior is discussed. After that, the function mechanism of PELE with TFC jacket is investigated through analyzing the influences of some factors on impacting behavior of PELE projectiles. These results can provide reliable theory and computational bases for future research.
Cu(In,Ga)Se2 Films Deposited by Sputtering with Single Cu(In,Ga)Se2 and Cu-Ga-In2Se3 Targets and a Subsequent Selenization Procedure
Authors: Kuo Dong Hau , Tu Yung Chin , Chen Wei Liang
Published: June 2014

Cu(In,Ga)Se2 (CIGSe) thin films were prepared by sputtering with single CIGSe or Cu-Ga-In2Se3 target and subsequent selenization at 550-700°C. The one- and two-step selenization procedures and the ceramic and cermet targets were used for process comparisons. Microstructure, film growth and film composition were used to evaluate the growth performance. CIGSe films sputtered from the CIGSe target had a low Cu content. CIGSe films prepared with single Cu-Ga-In2Se3 target had shown different performance after the one- and two-step selenization procedures. The two-step process did not grow the dense films due to the vaporization of Se-containing species from the incomplete reaction. The high-temperature requirement is the major disadvantage for the post-selenization approach.
Comparative Study of High-Power White LED’s Lifetime Based on Temperature Accelerated Test
Authors: Wei Shi , Zou Nian Yu , Zhang Yun Cui , Li De Sheng
Published: June 2014

The lifetimes of two white high-power LEDs were studied based temperature-acceleration life test. the acceleration temperatures were selected as 100°C and 90°C separately in the experiment, and the accelerated time was 800 hours. Based on Arrhenius model, activation energy of the two tested samples are 0.6978 and 0.7014 separately, and lifetime are7.41×105h and 1.46×105h separately. Our experimental results showed that the quality of the two type LEDs is very different, and lifetime of 50000 hours is recommended as the threshold of entering the market for high power white LEDs.
Static Tensile Properties Simulation of Plane Woven-Reinforced Laminates with Hole Damage
Authors: Wei Wu Guo
Published: June 2014

According to the structural difference between the unidirectional and the bidirectional laminate ply, the traditional 3-D (three-dimensional) Hashin failure criteria and the corresponding stiffness degradation rules were amended for damage tolerance simulation analysis of plane woven-reinforced laminates. Based on 3-D finite element technique, a secondary development was carried out on ANSYS software platform, a cumulative damage model was established, and the simulation analysis program for damage tolerance analysis of plane woven-reinforced laminates with hole damage was developed by use of APDL (ANSYS Parametric Design Language). In order to study the influence of different hole diameters on damage tolerance of plane woven-reinforced laminates, two kinds of G803/BMP316 plane woven-reinforced laminates with different hole diameters were selected as the analysis and verification object, and residual tensile strength and damage extension process of the damaged laminates were predicted and analyzed in the simulation. The simulations results are close to the experimental results, and visually present the situation of damage extension in each ply. It provides an effective tool for the damage tolerance analysis of plane woven-reinforced laminates with hole damage.
Effect of Hydrogen Dilution Ratio and Substrate Roughness on the Microstructure of Intrinsic Microcrystalline Silicon Thin Films
Authors: Yan Bao Jun , Liu Shu Lin , Liu Xiao Wei , Jiang Ting Ting
Published: June 2014

Intrinsic microcrystalline silicon (μc-Si:H) thin films were deposited on four kinds of substrates (polished quartz glass: PG, Rough quartz glass: RG, Textured SnO2:F coated glass: TG, Textured ZnO:Al coated glass: ZG) by 13.56 MHz plasma enhanced chemical vapor deposition (PECVD) with different hydrogen dilution ratio (RH=H2/SiH4) under the pressure of 2 Torr. The film thickness, crystalline volume fraction (XC) and substrate surface roughness (Ra) were measured by surface profilometer, Raman spectra and atom force microscopy (AFM), respectively. The results revealed that with the increase of RH, the deposition rate decreased and XC increased monotonously for the films deposited on the same substrate, but the substrate Ra had an obvious impact on the film microstructure. A physical model was proposed to illustrate the growth of the μc-Si:H thin films deposited on substrates with different Ra.
The Photoluminescence from (Eu, Yb) Co-Doped Silicon-Rich Si Oxides
Authors: Heng Cheng Lin , Su Wen Yong , Zhang Qi Wei , Ren X.Q. , Yin P.G. , Pan H.P. , Yao S.D. , Finstad Terje G.
Published: June 2014

We report on photoluminescence (PL) properties of europium (Eu) and ytterbium (Yb) co-doped silicon oxide films with different Si excess. After annealing the films in N2, strong PL were observed from Eu and Yb3+ ions and their intensities are correlated. The PL intensity of Eu is mainly from 3+ for no and relatively low temperature anneals (<900 °C) while the Eu2+ emission is dominating for annealing at 1000 °C or above in the co-doped Si-rich oxide films. Transmission electron microscopy shows amorphous (Eu, Yb, Si, O)-containing precipitates in the Si-rich oxide during 1000-1200 °C annealing and these precipitates are considered to be responsible for the Eu2+-related luminescence.
MR Based Brake-by-Wire System with Self-Energizing Capability
Authors: Liu Xu Hui , Yu Liang Yao , Ma Liang Xu
Published: June 2014

Brake-by-wire system is a new concept of brake system using electromechanical actuators instead of conventional hydraulic actuators. It is more compact, more efficient and responses faster than traditional brake systems. Magneto-rheological (MR) fluid is widely used due to its outstanding properties. In this paper, an MR based Brake-by-wire system with self-energizing capability were proposed and designed. It combined a typical single-disk-type MR brake with a wedge mechanism for self-energizing purpose. According to the torque analysis of the proposed MR brakes, the brake torque was significantly amplified. This research work presented a promising brake actuator, which allows MR fluids to be applied in automotive Brake-by-wire systems.
The Simulation of Heat Transfer and Flow Performance for Supercharged Boiler Superheater
Authors: Zhang Hong Yan , Xie Hai Tao , Jin Xiang Dong
Published: June 2014

According to the basic mechanism of the supercharged boiler superheater, a superheater simulation model was established. The simulation about a whole superheater system including the flue gas,steam and tube wall was conducted according to the simulation model.Therefore, the internal working laws of superheater system are revealed by the simulation results.
Bifurcation and Chaos in Couplings with Clearance
Authors: Houfek Martin , Houfek Lubomir
Published: June 2014

The paper is focused on analysis of dynamic properties of drive systems. It describes the possible ways of stability analysis and possible ways of analysis of bifurcation of steady states and possible occurrence of chaotic behavior.
Improved Dynamic Bayesian Networks in Sea-Battlefield Situation Assessment
Authors: Yu Yong Tao , Ding Ying
Published: June 2014

How to efficiently evaluate the dynamic and complex the sea-battlefield situation facing the reality of the problem is the operational decision support. According to research sea-battlefield situation assessment based on improved dynamic Bayesian networks. First constructed the sea-battlefield situation assessment Bayesian networks model; second specific assessment task to establish the corresponding dynamic Bayesian networks; again reintroduced extended hidden variables, supplemental situation information to construct improved dynamic Bayesian networks; finally, according to the battlefield event reasoning, complete sea-battlefield situation assessment.
Identification of Lightning Strikes on Transmission Lines Based on Integral Method and Wavelet Analysis
Authors: Yan Hong Wei , Zhu Yong Li , Fan Guo Chen , Xiong Xi
Published: June 2014

Transient signals caused by lightning strikes on transmission lines may interfere with the distance measuring devices relying on traveling wave. A synthesized method based on the additional components of disturbed current is proposed to distinguish between lightning interference, lightning fault and short-circuit fault. Firstly, since the disturbed current waveform generated by lightning interference and faults are distinct in the time domain, transient current components over and below timeline are respectively integrated to identify lightning interference from faults. And then, due to the distribution differences of current in the frequency domain, multi-scale transformation of wavelet is adopted to analyze the energy spectrum of transient current generated by short-circuit fault and faults of lightning. Numerous PSCAD simulation results demonstrate the proposed method is valid and correct.
The Design of Wide-Stopband HTS Bandpass Filter
Authors: Yang Hong , Zhou Yan
Published: June 2014

This paper presents the design of a wide-stopband HTS bandpass filter (BPF). The 9-pole wide-stopband BPF has a center frequency 2.21GHz and bandwidth 100 MHz. Based on the step impedance resonator,this filter increase the harmonic frequency to more than 3 times of fundamental frequency. Optimization simulation results shows that insertion loss is less than 0.3 dB in the passband,and stopband suppression is greater than 80 dB within 0~f0-BW and greater than 60 db within the f0 + BW ~ 3 f0. Within the passband, dB (S (2, 1)) < -20. This design not only achieved a good wide stopband and solved the interference problem but also had a simple structure which is easy to implement.
The Engine Fault Diagnosis Based on Time Domain and Frequency Domain
Authors: Yao Zhu Ting , Pan Hong Xia
Published: June 2014

Engine is as a power machine, the operating status is good or bad, directly affects the working status of equipment. The status monitoring and fault diagnosis is very necessary to ensure that the equipment runs in its best, and improves equipment maintenance quality and efficiency. The engine failure shows the complexity and diversity of the interaction and complex relationship between the various subsystems of the engine, that is the fault of complexity, ambiguity, correlation, relativity and multiple faults coexistence. The available information are much in the engine diagnosis, for example, the vibration signal from bearings, cylinder head or cylinder block surface; oil, cooling water, pressure of intake, exhaust and fuel; temperature signal; noise, speed or oil-sample signals. In this paper, an engine as an example, engine fault diagnosis experimental system is built, the normal state, left one and right six cylinders off the oil, air filter blockage (inlet wood blockage is 30%, the inlet has screen cloth.) in the load of 2565Nm, and the speeds of 1500r/min, 1800r/min, 2200r/min are studied. The experimental results analysis, feature extraction and fault diagnosis are finished based on the time domain and frequency domain. Keywords: engine, fault diagnosis, time domain, frequency domain.
On the Hybrid Mean Value of the Square Residue
Authors: Lan Qi
Published: June 2014

Let n be a positive integer, denote S(n) the square residue.This paper is mainly to study the hybrid mean value properties of the square residue S(n) and the Mangoldt function,and give an interesting asymptotic formula.
On Infinite Lower Order of Vector Valued Dirichlet Series
Authors: Lu Wan Chun
Published: June 2014

In this paper, the infinite lower order of vector valued Dirichlet series is investigated. By using a kind of new growth parameters of infinite lower order of analysis functions is introduced, the characterizations of coefficients of series are obtained.
The Design of Multi-Protocol Network Based on Point-to-Point Protocol and Frame Relay
Authors: Gong Wen Tao
Published: June 2014

Local area network and wide area network are different network protocols, small and medium enterprises due to the geographical distribution of discrete and interface diversity, leading to its needs to be compatible with different network protocols, it is difficult to use a single network protocol to realize network architecture, and due to the ipv4 address scarcity, making its application or maintenance cost greatly increased, based on this, this paper presents the design of multi-protocol network architecture based on point-to-point protocol and frame relay, and with the advantages of the router is compatible with a variety of interfaces and protocols to connect different network interfaces, the paper also gives the configuration of routing information protocol and static routing through local area network, the paper presents the core information of frame relay and point-to-point protocol among the routers, and the paper gives the realization of the network address translation in the end.
Effect of Pr Modification Treatment on the Microstructure and Mechanical Properties of Cast Al-Mg2Si Metal Matrix Composite
Authors: Si Yi
Published: June 2014

The effect of different concentrations of Pr on the microstructure and tensile properties of cast Al-18 wt.%Mg2Si in situ metal matrix composite was investigated. The results show that the addition of proper amount of Pr has significant modification effect on primary Mg2Si in the Al-18 wt.% Mg2Si composite. With the increase of Pr content from 0.1 to 0.7%, the morphology of primary Mg2Si is changed from irregular or dendritic to polyhedral shape, and its average particle size is significantly decreased from 65 to 17 μm. When the Pr content exceeds 1.0%, the primary Mg2Si become coarse again. Tensile tests reveal that the Pr addition improves the tensile strength and ductility of the material. Comparing with those of unmodified composite, the ultimate tensile strength and percentage elongation with 0.7% Pr are increased by 36.5% and 161.6%, respectively.
Research on Agent-Based Mobile Database Structure
Authors: Tian Qiu Yan , Fei Long , Tian Wei
Published: June 2014

With the transaction processing, data query, location query and other functions of mobile devices, the demand for mobile database has also increased. The analysis of the agent-based mobile database structure and the deficiencies of existing systems provide the basis for future research..
A New Cache-Based Network Coding Retransmission Scheme in Wireless Communication Networks
Authors: Wang Lian , Liu Min
Published: June 2014

Cache-based network coding has been proposed recently as an effective method to improve retransmission efficiency. In this way, the receiver will cache the encoded packets that cannot be decoded rather than delete. However, some cache-based methods neglect the overlap relationship among encoded packets or cached encoded packets. In this paper a new cache-based network coding retransmission scheme in wireless communication networks (CNCR) has been proposed, in which the buffer list of failed encoded packets at the receiver will be updated by simplifying the cached encoded packets according to their overlap relationship. Furthermore the special case " the cross relation " has been introduced, the requested packet in this case will be retransmitted immediately, and the fast decoding of encoded packets cached in the buffer list can be realized. Finally the simulation results show that CNCR can improve the recovery efficiency, and have apparently superiority to previous works proposed.
Application of Traditional Chinese Decorative Patterns in Ceramics Design
Authors: Ouyang Chao Ying , Xiong Ya Jie , Li Lin
Published: June 2014

As an important part of traditional Chinese culture, traditional Chinese decorative patterns, to a great extent, symbolise local customs as well as social, political and economic circumstances of China. Ceramics is of both use value and aesthetic value. Decorative patterns facilitate the latter of the two as a main means. Nowadays, designers are facing a great challenge of how to inherit the aesthetics and the spirit of traditional Chinese decorative patterns and how to apply modern design concepts to contemporary ceramics design. This paper investigates the origins, implications, categorizations and application examples of traditional Chinese decorative patterns in both ancient and modern ceramics designs. Based on the investigation, the paper strives to demonstrate the essence of traditional Chinese decorative patterns, enhance the charm of modern ceramics design, as well as to explore new cultural added value of traditional Chinese decorative patterns.
Fabrication and Characterization of CuO Micro-Dimensional Structures for Superhydrophobic Surface
Authors: Fan You Hua , Chen Ze Jun , Deng La Yun , Chen Hong
Published: June 2014

A superhydrophobic copper oxygen (CuO) surface with hierarchical micro- and nanostructure was obtained by hydrothermally synthesized. The CuO surface was endowed with superhydrophobic property by modifying with stearic acid, which was referred to the STA-modified CuO film. The surface morphological study showed that different structures, such as petal-shaped, bulk-shaped, carambola-shaped CuO and cauliflower-shaped particles distributed on the copper substrate under the different synthesis conditions. The water contact angle and sliding angle of the as-prepared CuO surface were 157 ± 2.3º and 3º, respectively.
Safeguard System on the Quality of Excellent Engineers Training
Authors: Liu Chang Ming
Published: June 2014

Based on literature research, this study proposed a topic on the safeguard system of quality of excellent engineers training. Four safeguard elements of training quality are elaborated, namely, faculty building (premise), collaboration with enterprises (key point), governmental support (guarantee) and the participation of students (basis). Likewise, basic knowledge structure, engineering capability training and engineering accomplishment cultivation are safeguard elements of training quality. Meanwhile, the construction of collaboration, control of practice, improvement of safeguard mechanism and the fulfillment of participating members are safeguard conditions of training quality. It is concluded that Excellence Program can be achieved and effective by constructing the safeguard system of training quality and serious process control.
Design Methodologies of Ship General Arrangements - A Review
Authors: Han Duan Feng , Abdelkhalek Hany , Chen Miao
Published: June 2014

This paper presents an overview of ship general arrangement design methodologies and philosophies and early-stage design capabilities, particularly during the last decade. The arrangement of a ship has a unique feature in that it can both enable successful shipboard operations and constrain the performance of all subsystems. Stable ship layout is critical to producible, and therefore cost effective, designs and time. This paper overviews the efforts made by the researchers in the last decade to improve generating the arrangement rapidly . Also, identify areas of the ship general arrangements process that are insufficiently addressed or not addressed at all in order to keep pushing the field of general arrangements forward.
Research on Modes of Recycling and Remanufacturing with Considering the Carbon Footprint
Authors: Jiang Yue
Published: June 2014

Three modes of recycling and remanufacturing are discussed when the carbon tax is imposed, the impact of carbon emissions on the mode of recycling and remanufacturing is further analyzed. The results show that the optimal price and sales of the new product and remanufactured product in the second stage are relevant with the carbon emissions in their manufacturing and selling process, not relevant with the carbon emissions in their recycling process. OEM will be more inclined to remanufacture themselves with the increasing environment awareness of consumers.
Spatiotemporal Distribution of Rainfall Erosivity in the Bailong River Basin, Gansu Province
Authors: Zhang Peng , Wang Gang , Tian Li Ming , Zhang Ya Li
Published: June 2014

Rainfall erosivity is one of the key parameters that determine soil erosion, sediment yield, and water quality, thus its importance has grown in modeling of the environmental effects of climate change. The spatial and temporal distribution of rainfall erosivity in the Bailong River Basin in China's Gansu Province were analyzed. We derived a rainfall erosivity map based on data from 18 meteorological stations in and around the basin using the inverse distance weighting interpolation approach. The annual mean rainfall erosivity within the Bailong River Basin was 798.8 MJ mm ha-1 h-1 yr-1. The mean annual amount of erosive rainfall accounts for 36.0 to 47.1% of annual precipitation, depending on the station. Rainfall erosivity was greatest from June to September, and rainfall during this period accounts for 77.7% to 84.8% of the total annual rainfall erosivity.
Highly Strained Silicon Nitride Thin Film Deposited by PECVD with Double Frequencies in Strained Silicon Technologies
Authors: Shu Bin , Chen Jing Ming , Zhang He Ming , Zhu Feng , Quan Pu Li , Gu Jiang Yuan , Xuan Rong Xi , Hu Hui Yong , Song Jian Jun
Published: June 2014

The mechanism of high stress in silicon nitride thin film is studied systematically in this paper. The effects of the various process parameters on the stress in silicon nitride thin film deposited by PECVD are analyzed and discussed. The silicon nitride thin film with high compressive and tensile stress has been deposited on the optimized process parameters and the compressive and tensile stress are up to-1.38GPa and 866MPa, respectively. Finally, the method of further improving the stress in silicon nitride thin film is presented.
Layer Formation of SAPO-34 Zeotype Material by EPD Seeding Method Followed by Hydrothermal Secondary Growth
Authors: Davarani S.M. Hosseini , Fatemi Sh. , Jabbari Z.
Published: June 2014

Fine layer growth of SAPO-34 crystals on the steel and α-alumina substrates has been investigated by electrophoretic deposition (EPD) followed by secondary growth. At first step, two sizes of SAPO-34 seeds with different composition of precursor solution were synthesized. Thereafter the best quality of the seeds in term of crystal size was selected for seeding operation. All seeded samples were prepared by electrophoretic deposition (EPD) with 0.4 wt% powder in solution, voltage of 4.5 V and deposition time of 90 min, followed by the secondary growth in a Teflon lined autoclave for crystallization at 473K for 24 hr. The prepared fine seeds characterized by XRD and SEM analysis. Also the substrates were broken and characterized by SEM methods in terms of surface coverage and mean size of the particles. The results revealed a better quality of the coated film on the surface of steel rather than α-alumina on the base of homogeneity and crystal size.
Study on the Polarization Reversal Characteristics of a Ferroelectric Thin Film with Surface Transition Layers
Authors: Cui Lian , Qiu Zhong Yang , Han Zhi You , Li Rui Ying , Che Ji Xin
Published: June 2014

Utilizing the Landau-Khalatnikov equation of motion, the polarization reversal characteristics of a ferroelectric thin film with surface transition layers have been first investigated. We have discussed the effects of the thickness, the surface transition layer parameters and the temperature on the switching properties of a ferroelectric thin film. The results show that the stronger the surface transition layer effects are, the smaller the coercive field and switching time are.