bluuebunny/crossref_metadata_2025 huggingface dataset:
Aging Behavior of Semi-Solid Mg-10Al-0.3Mn Alloy by the Hot Extrusion
Authors: Kim Dae Hwan , Kim Heek Yung , Lim Su Gun
Published: March 2013

In present study, the aging behavior of the hot extruded semi-solid Mg-10Al-0.3Mn alloy was investigated. In order to obtain the extruded bar, we carried out the hot extrusion at 380°C with an extrusion ratio of 25 and ram speed of 2.4mms-1. Vickers hardness test, electrical conductivity measurements, scanning and transmission electron microscopy and tensile testing were performed to identify the aging behaviors and mechanical properties during the aging treatment. Observations of the aging behavior and results of the tensile tests after the T6 heat treatment at each aging temperature show that the optimum aging conditions was indicated by a hardness increment of 72% and a tensile strength of 340MPa in the extruded bar.
A Novel Patternable Electrophoretic Polymer Coating for Sidewall Packaging in Microelectronic Devices
Authors: Wu Yi Bo , Liu Guo You , Wang Hong , Ding Gui Fu
Published: March 2013

This paper presents a novel patternable electrophoretic polymer (EPP) coating technology for sidewall package in microelectronic devices. The main features of this EPP film are directly patterned via through-mask electrophoretic deposition. The proposed EPP coating has some overwhelming merits against other coating polymers, such as self-patterning via through-mask deposition, good adhesive performance, selective coating, low cost and compatible with IC process. The focus is on the process, patterning, properties characterization and application of this novel electrophoretic polymer. The main applications can be aimed for electrical/thermal isolations or sidewall packaging in semiconductor device package.
Investigates of Fabric Coating Approaches: Parameters for Fabric Performance
Authors: Wan Tao Yu , Stylios G.K.
Published: March 2013

This study examined the effect of the coating speed, coating solution, cure temperature, knife gap and fabric matrixes on surface properties, water vapor permeability and hydrostatic head test. The optimum conditions for surface high water vapour permeability that enables the user to “dial in” the right balance of properties based on the findings of the experimental. This sample showed high excellent resistance to +7m in hydrostatic head tests for a single-layer coated fabric and. Surface morphology showed that the coating was continuous without cracks or pin holes and appeared to be well adhered to the substrate even after a harsh wash.
Chemical Recycling of Epoxide-Anhydride Hardened Networks Using Near-Critical Water
Authors: Liu Yu Yan , Wu Song Quan , Li Li , Liu Yu Ting , Shan Guo Hua
Published: March 2013

The degradation behaviour of an anhydride-cured bisphenol A diglycidyl ether (DGEBA) epoxy resin in near-critical water was studied in this paper. The experiments were performed in a stainless steel reactor (100ml) without stirring. Epoxy resin could be decomposed successfully at 270°C for 30 min. The degradation rate of epoxy resin increased with an increase in reaction temperature and reaction pressure. The degradation reaction products were characterized by gas chromatography-mass spectrometry (GC-MS). The degradation reaction was associated with the scission of ester and ether bonds which further destabilizes the epoxy network.
Performance of Granular Media from Blast Furnace Slag on Beer Wastewater Treatment
Authors: Li Shan Ping , Jiang Yan Yan , Zeng Xue Yuan , Ma Xiang Ru
Published: March 2013

In order to improve utilization ratio of blast furnace slag (BFS), the study used BFS, cement and building glue to make blast-furnace-slag granular media (BGM) in a non-sintered process. The characterization of BGM was analyzed by physical method, scanning electron microscopy (SEM) and D/max-rA X-ray diffraction (XRD). And the influence of hydraulic retention time (HRT) and air-liquid ratio (A/L) on the removal of average chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N) were also investigated. The results indicated that the BGM presented high total porosity, large total surface area and low bulk and apparent density. The BGM reactor showed the good removal efficiency on COD and NH4+-N with HRT of 6 h and A/L of 5:1, which were above 86% and 90%, respectively. Overall, BGM showed good performance as wastewater treatment filter media in biological aerated filters (BAF), whose application is a promising way to use waste blast furnace slag.
Experiment on Electroforming Ni-Fe Property for Micro Fabrication
Authors: Zheng Xiao Hu , Feng Gu
Published: March 2013

The relationship between the composition, coating microstructure and electromagnetic properties of electroforming Ni-Fe alloys was studied in this paper. And the optimal process parameters to obtain Ni-20%Fe deposition was as following: FeSO4•7H20 concentration was 6 g/L; PH value of the solution was 2.5; current density was 3.5 A/dm2; electrolyte temperature 55 °C. The results indicate that the Ni-Fe deposit is bright and compact, the crystal-planes of the plating were (111), (220) and (200). Electrodeposited Ni-20%Fe has a strong paramagnetism effect with the smallest remanence of 0.5 emu, The coercivity show a monotonic decrease with increasing Fe content in deposit, which proved that the electroformed Ni-20%Fe alloy has good electromagnetic property and could be used in MEMS actuator manufacturing.
Twinning Stress in Fcc Metals from the Classical Nucleation Theory
Authors: Wu Yan Jun , Zhu Rong
Published: March 2013

Deformation twinning is widely observed in face-centered cubic (fcc) metals. The stress for activating twinning is an important issue to be solved. We presented an expression linking to twinning stress based on the total energy change associated with the formation of a twinning nucleus according to the classical nucleation theory. We assume there exist no energy fluctuations to overcome the nucleation barrier. The expression can predict the twinning stress for fcc metals, which is in excellent agreement with experimental results with simple form. Finally, we introduce a measure twinability to quantify the propensity of fcc metals to twin as opposed to cross-slip.
Simulation of Helical Gear Heated by Induction Process Using 3D Model
Authors: Barka Noureddine , Chebak Ahmed , El Ouafi Abderrazak
Published: March 2013

This paper is devoted to develop a 3D model applied to helical gear heated by induction process. The global work is realised by multiphysicsimulation coupling electromagneticfields and heat transfer using Comsolsoftware. This model permits to establish the temperature distribution in function of simulation parameters. The results are very promising since they allow understanding the dissymmetry effect of heating that affect the real hardness profile. Finally, a global sensitivity study about nominal values of machine parameters is conducted to quantify the effect of power consumed by the part on the surface temperature.
Apply of Industrial Engineering Techniques for Cost Reduction in Frozen Food Industry
Authors: Laemlaksakul Vanchai , Kaewkuekool Sittichai , Wangnoorak Theppitak
Published: March 2013

The objective of this research was to apply the industrial engineering techniques for cost reduction in frozen food industry. Process line survey, line balancing and cost analysis were conducted in each work station to analyze the problem. Data showed that three work stations namely, peeled trim station, arrangement before cooked station, and arrangement in tray station, needed to be improved. Investigation the problems and rate of production at each station the researchers proposed the way to increase the productivity of arrangement before cooked station by setting layout and conveyor installing project. The peeled trim station was proposed to improvement by the labor skilled development and layout design project for process continuous. Also the pre packing arrangement on tray and after freeze station was proposed to improvement by modifying its plant layout and conveyor installing project. It was found that line balancing capability increased from 78.32 % to 90.80 %. The labor skilled development project combined with a design plant layout and conveyor installing system were resulted in reducing 33 persons of labor. It was also showed that the production units cost for the production line can be reduced by 16.65 %. The flow process chart of the production line has showed that delay and transportation activities were reduced from 23.00 % down to 8.70 %.
Error Modeling and Iterative Algorithm for Compensation Instructions of Five-Axes NC Machine Tools Based on the Multi-Body System Theory
Authors: Cai Li Gang , Lu Huai Qing , Luo Rui , Cheng Qiang , Gu Pei Hua
Published: March 2013

The machining accuracy of NC machine can be improved significantly through the error compensation. The kernels of (multi-body system)MBS theories are that the number arrays of low-order body are used to describe the topological structures which are taken to generalize and refine MBS, and the characteristic matrix are employed to represent the relative positions and gestures between any two bodies in MBS. Based on the theory of rigid body dynamics and homogeneous coordinate transformation techniques, the space error model of five-axis gantry NC machine can be established, the modified NC instructions can be obtained and it prepares well ready for the software error compensation and the practical application. Gyratory motion of five-axis NC machine will generate the coupling of translational motion, so it is different from the three-axis NC machine in the process of error compensation and we need to decoupling.
A Myoelectric Controlled Prosthetic Hand Modelling and its Transmission Mechanism Dynamic Load Based on a Two-Stage Planetary Gear Transmission
Authors: Shao Ren Ping , Li Jing , Huang Xin Na , Chen Li Qun
Published: March 2013

A new transmission scheme for the myoelectric prosthetic hand is proposed and establishes its 3D parametric model. In order to improve the transmission efficiency and reduce vibration、noise and shock in the situation of the smallest volume. Meanwhile considering the time-varying meshing stiffness of gear pair, lateral vibration, longitudinal vibration and the vibration along the meshing line direction of sun gear and planetary gear, the dynamic analysis model of dual output planetary gear transmission mechanism for the myoelectric prosthetic hand is established. By analyzing the dynamic model, the dynamic characteristics, dynamic response and dynamic load of system are obtained, which lays a foundation for dynamic design of the myoelectric prosthetic hand further.
Coupling Analysis on Dynamics and Tribology for Cycloid Transmission Used in Robot Joint
Authors: Shao Ren Ping , Wang Wei , Li Jing , Huang Xin Na
Published: March 2013

A new scheme of high speed ratio cycloid transmission system used in robot joint is proposed. It has high transmission ratio that is 5 to 10 times larger than 2K-V type cycloid transmission when they has the same volume. The 3D model of the new transmission system is established and its motion condition is simulated, so it verifies the feasibility of the transmission scheme. Considering of the factors such as sliding friction between teeth, gear meshing stiffness and torsion stiffness of the shaft, an 18-degree-of-freedom dynamical model is established, and its dynamics is investigated, the dynamical response and dynamic loads of the new transmission system components considered friction are obtained. Compared with the results having no friction, it can be find that friction between the cycloid gear and the needle teeth impacts the vibration peak value of the new transmission elements in different degree. These provide a good foundation for the dynamical design and performance analysis of a robot.
Strength Analysis of the Seat Structure for Large Passenger Vehicles by Using Finite Element Method
Authors: Siwadamrongpong Somsak , Rooppakhun Supakit , Burakorn Pakorn , Murachai Natchaya
Published: March 2013

Presently, large passenger vehicles are known to have high risk of an injury due to accident and insufficient of safety regulation. The strength of seat is one of important issues that affect to injury level of passenger. Therefore, suitable structure strength and design of the seat are very important to prevent injuries and passenger life. This study was to evaluate strength of the seat structure for bus according to preliminary safety regulation of Department of Land Transport. Finite element analysis is employed by using a static load. The seat model was simplified and simulated. Stress and impact scenario between seat-back and back of manikin will be investigated. The strength and deflection of the seat will be evaluated. This study is expected to provide the seat model which will be safe and satisfied according to the regulation.
Study of Key Technologies of Monitoring in Stage Hydraulic System
Authors: Fu Rui Gang , Dong Yue , Xiao Huai Yu , Wang Chun Zhi , Zhang Xin Xiang
Published: March 2013

As cultural life becomes rich,people have increasing demands for stage effects on performances.In some top grade cultural sites and entertainment venues,hydraulic lift stages replace traditional stationary stages for the sake of creating lively three-dimensional performance effects.However, stage hydraulic system is relatively huge.It’s not easy to check out the location of the fault quickly, which makes the efficiency of resolving the fault low. Based on the simulation of the circuit of stage hydraulic system,by means of collecting,transforming and analyzing pressure and flow signal of “final mile” of stage hydraulic system under different pressure conditions,we can summarize the relationship between pressure and flow as well as realize remote monitoring. And then we can determine whether there is a fault,and resolve the fault in time. In addition,a solenoid valve is added to the circuit,which makes the two-way circulation loop possible.
Software Reliability Demonstration Testing Plan Based on Bayesian Theory
Authors: Li Qiu Ying , Tong Hao Nan
Published: March 2013

For highly reliable software, it is expensive, time consuming or even infeasible to perform reliability testing by traditional Bayesian-based software reliability demonstration testing plan. Meanwhile, when determining the prior distribution function, people only consider conjugate prior distribution in order to realize the calculation in mathematics but ignores the characteristics of highly reliable software. To address this problem, by introducing the construction method of multilayer prior distribution function into the software reliability demonstration testing plan, this paper put forward a new Bayesian software reliability demonstration testing plan with zero-failure data, which can be used for highly reliable software reliability demonstration testing. Finally through examples, it illustrated the superiority of the method.
Obstacles Detecting on Blind Sidewalk System Based on Image Processing Scheme
Authors: Fu Jian Yu , Gong Ze , Cheg Xiao Run , Cai Ren Mao , Wang Wei
Published: March 2013

A lot of blind sidewalks have been built for the blind people to facilitate their life. In current society, however, it is such a serious phenomenon that the blind sidewalk is occupied by a variety of stuff. With the development of science and technology, some applications served as helpers for the blind people have been developing until recent year. This paper mainly proposes an approach on helping blind people walk on the blind sidewalk. Histogram-based detection methods are used for obstacles and sidewalk recognition in this paper, and methods of image similarity matching are also developed for the detection of obstacles on the blind sidewalk. We processed the images extracted from video streams by the methods presented above and then conducted a couple of experiments to exam the accuracy of this system.
Study on Cross-Linking Degree of Polyethylene
Authors: Zou Li Qiu , Wu Guang Feng
Published: March 2013

In this paper, the linear low density polyethylene (LLDPE) was melted and cross-linked by dicumyl peroxide (DCP) used to prepare cross-linked polyethylene (XPE). The gel content was determined by extraction method. The effect of content of cross-linker, cross- linked time, cross-linked temperature and other factors on the gel content were studied. It was found that the extraction time should be 18h for XPE. The gel content increased with the increasing of cross-linked time. When the cross-linked time was 10-15min, DCP was almost complete decomposition. The gel content was basically stable when the cross-linked temperature was 170-175 oC. The maximum of gel fraction was about 90%.
Research on Recognition of Pathological Voice by AD Tree
Authors: Zhu Jun Jie , Zhang Xiao Jun , Gu Ji Hua , Zhao He Ming , Zhou Qiang , Tao Zhi
Published: March 2013

This paper mainly studies on the classification of pathological voice from normal voice based on the sustained vowel /a/. Firstly, the original 18 acoustic features are extracted. Then on the basis of the extracted parameters, this paper recognizes the pathological voice using AD Tree. During the classification stage, the cross-validation of features is also as references in the process. This method is validated with a sound database provided by the Massachusetts Eye and Ear Infirmary (MEEI). After the 10 fold cross-validation, comparing with 7 other kinds of classifiers, the experimental results show that AD Tree can get the highest recognition rate of 95.2%. The method in this paper shows that all the extracted parameters are reasonable in the following recognition process and AD tree is a good recognition way in pathological voice research.
Application of Adaptive Wavelet Thresholding to Ultrasonic Signal Compression of Aluminum Alloy Forgings
Authors: Liu Shou Shan , Wang Chuan Jiang , Bi Li Jun , Lv Chang Zhi
Published: March 2013

In this paper, for the purpose of ultrasonic signal compression and the coherent noise depressing in nondestructive test of aluminum alloy forging, the mathematical model of defect echoes is discussed and confirmed. And then the wavelet kernel is also confirmed according the waveform of the defect echoes. As the algorithms of standard hard thresholding and soft thresholding of wavelet transform can not bring out effective compression and depression to the coherent noise, an adaptive wavelet thresholding algorithm is introduced. Experimental results indicate that the adaptive wavelet thresholding algorithm can offer effective signal compression and depression to the coherent noise.
Effect of NiO Nanoparticles on Magnetic Polymer Electrolyte for Dye-Sensitized Solar Cells
Authors: Yang Ying , Cui Jia Rui , Yi Peng Fei , Xiao Si , Guo Xue Yi
Published: March 2013

A magnetic polymer electrolyte using agarose as polymer matrix, NMP as solvent and NiO nanoparticles as modifier was investigated and employed in the dye-sensitized solar cell (DSSC) in this paper. The influence of NiO nanoparticles content on magnetic polymer electrolyte was characterized by SEM and ionic conductivity test. The photovoltaic properties of the corresponding DSSCs were studied by photovoltaic performance tests. The results showed that the surface morphology of the polymer electrolyte with 1.0wt% NiO nanoparticles was smooth and this magnetic polymer electrolyte showed the maximum conductivity (2.43×10-3S•cm-1). The optimal photoelectric efficiency of 1.63% was achieved at the NiO nanoparticles content of 1.0wt%.
Research on Data Assimilation Methods of Multi-Space-Time Meteroligical and Hydrological Data
Authors: Kong Lu , Song Ying Zi , You Da Ming
Published: March 2013

Meteorological and hydrological data has the feature of multi-semantic space, multi-space-time, multi-scale and it has a diversed means to be acquired and storaged, which brings the diversity of multi-origin characteristics. This paper will adopt the method of data assimilation to study a variety of data models with different scales and the key technology the grid resolution spatial data integration in order to establish a meteorological and hydrological model of multi-source spatial data assimilation.
Web-Based Meteorological Information System Design and its Applications in Intelligent Hydroelectric
Authors: Wu Zhi Jian , Song Ying Zi , Zhou Hai Song
Published: March 2013

This article describes an software architecture and functional design of the meteorological information system based on Web technology, which embedded a smart hydropower plant system ,introduces an actual construction of a hydroelectric power plant meteorological information system of a smart hydropower plant. At the same time, explore the prospects and development direction of the meteorological information system smart hydropower plant.
Research on Urban Digital Governance Framework Based on Grid Management
Authors: Ding Long , Zhang Li
Published: March 2013

Urban grid management (UGM), as a new urban digital governance pattern, has been applied in more and more Chinese cities in recent years. After analyzing the digital governance practices in Beijing - the key technology, management method, management procedure and implementation effect of the UGM pattern, we find that UGM pattern is capable of both simplifying administrative process and improving the government management efficiency, while the target of digital governance to provide quality public service and expand public participation has been ignored. Therefore, an urban digital governance framework based on grid management consisting of four modules and eight systems is put forward in this paper. This framework takes into account the improving government management efficiency, providing better public service and expanding democratic participation at the same time.
Structure and Optical Properties of Superlattices ZnO Doped with Mg
Authors: Xiang Qian , Xiong Zhi Hua , Jiang Ying , Qin Zhen Zhen , Chen Lan Li
Published: March 2013

Based on the first-principles calculations, we present a study for Mg-doped superlattices ZnO. We find that the volume of superlattices ZnO is reduced, while the band gap is extended. The dielectric function peaks of superlattices ZnO become smaller in the low-energy region. Interestingly, we further find Superlattices ZnO has great geometrical stability due to the electrostatic potential of the doped layer is smaller than that of pure ZnO. The results provide a theoretical basis for photoelectric device manufacturing.
Design and Application of SCM-Based Caller Information Identification System
Authors: Hu Lei Ming
Published: March 2013

This paper utilizes STC11F04 SCM and dedicated decoder chip to build DTMF / FSK dual system caller information identification system, elaborately describes the design principles and the structure of the decoder. The decoder passes telephone caller information into the computer via USB bus and combines with the database query functions and SMS gateway to realize Caller ID Screen Popup and hang-up SMS functions.
Theoretical Modeling and Simulation of Higher Order FWM Crosstalks in Multichannel WDM Optical Communication Systems
Authors: Yazdani Arash , Noshad Morteza , Farrokhi Abbas
Published: March 2013

In this paper, we derive a theoretical model for the higher order FWM power in WDM networks with NZDSF fibers for the first time. We have investigated the higher order FWM power theoretically and by numerical simulations. Dividing the fiber into finite number of elements and applying the boundary conditions, allow us derive an expression for second order power penalty. At the end of each element we derive the first order FWM power for all wavelengths and use these values to calculate the second order FWM power in the next element. Consequently, for each channel we can compute the total second order FWM power penalty at the end of the fiber.
Energy Management System Research for Wind-PV-ES Hybrid Microgrid Based on Storage Battery
Authors: Xue Lei , Wang Li Bin , Wang Zhi Gang , Li Shu Ying
Published: March 2013

Energy management strategy is important to keep microgrid stable. In this paper, energy management strategy of Wind-PV-ES hybrid microgrid is proposed. Due to the power output of wind and PV are unknown quantities, the key point of Wind-PV-ES hybrid energy management lies in the energy management of storage battery. The flow charts of energy management strategy are given in detail and Wind-PV-ES microgrid model is built with DigSILENT/PowerFactory. Then the transition state simulation as to the micro-grid mode switching process is carried out. The result shows that the proposed energy management strategy could keep connected bus voltage and micro-grid frequency stable in grid-connected mode, islanding mode and during micro-grid mode switching.
Optimization on Attacking Block Cipher with Parallel Computing of GPU
Authors: Xia Xiao Ling , Chen Zhao , Yang Anrong
Published: March 2013

Since many works have been devoted to attack the Block Cipher, in this paper, on the base of the prior work, we take the advantage of the capacity of parallel computing of GPU and use Light Encryption Device (LED) as an object of experiment. After modifying the algorithm, we reduce the time complexity of the attack that reveals the whole key of LED from 218 to 210.
A Wireless Wormhole Detection Model Based on Packet Leashes
Authors: Mei Song , Yuan Jiang , Wu Feng , Wang Wei Ling
Published: March 2013

With the widely range of applications of wireless ad hoc networks, security threats are increasingly prominent, especially wormhole attacks. In a wormhole attack, unauthenticated entities secretly built wormhole tunnels, silently received messages and selectively reply. In this paper, we introduce an approach to detect and defense against wormhole attacks based on packet leashes scheme. Our solution effectively integrated shared symmetric key authentication and TIK protocol to reduce transmission delay and energy consumption. The result shows that the model can save power and reduce communication delay without sacrificing the accuracy of detection.
Thermoelectric Properties of Half-Heusler TiCoSb1-xSnx Synthesized by Mechanical Alloying Process
Authors: Kim Il Ho , Lee Young Geun , Choi Moon Kwan , Ur Soon Chul
Published: March 2013

Half-heusler TiCoSb1-xSnx (0.00≤x≤0.05) alloys were prepared by mechanical alloying of elemental powders, and consolidated by vacuum hot pressing. Sn doped half-Heusler phases of TiCoSb was successfully produced in all doping ranges by vacuum hot pressing using as-milled powders without subsequent annealing. However, a little fraction of CoSb phase appeared after hot pressing. Thermoelectric properties as functions of temperature were evaluated for hot pressed specimens. Seebeck coefficients showed to change in conductivity by doping and the absolute value revealed relatively low. It is shown that electrical conductivity is relatively high and thermal conductivities are compatibly low. Sb doping up to x=0.02 in TiCoSb1-xSnx was shown to be effective on thermoelectric properties in this study.
A New Method of Constructing a Disc for Concrete Surface Floating
Authors: Respondek Zbigniew , Rajczyk Zbigniew , Kosiń Mariusz , Jończyk Damian , Kalinowski Jarosław
Published: March 2013

Concrete surfaces are becoming increasingly popular in road construction around the world. This is due to a number of advantages, such as high durability amounting up to 40 years, high load capacity, resistance to rutting at high temperatures, and light color which allows for reduction of costs of lighting. This paper presents a new method of constructing a disc for concrete surface floating. On the basis of numerical calculations a nomogram has been designed which can serve for selecting the optimal disc’s geometrical parameters of required geometric efficiency of a working tool’s influence based on the criterion of uniformity of processing (Sg). In the case of the analyzed geometry an increase of the required geometric efficiency the minimum value of the standard deviation and standard deviation ratio increase accordingly, which is the measure of processed surface uniformity, which is it leads to quality deterioration of machining.
Preparation and Photoelectrocatalytic Performance of TiO2 Nano-Tubes Arrays Electrode
Authors: Cheng Xiu Wen , Liu Hui Ling , Chen Qing Hua , Li Jun Jing , Yu Xiu Juan
Published: March 2013

Highly ordered TiO2 nano-tubes arrays (TNTAs) electrode was fabricated through anodization. The effects of some experimental parameters on photocatalytic (PC) activity and photoelectrocatalytic (PEC) activity were investigated in detail. It was found that the optimum preparng conditions were as followed: the applied voltage, water content, fluoride concentration, anodization time and reaction temperature was 20 V, 40 vol%, 0.5 wt%, 2 h and 40 °C, respectively. In addition, the TNTAs electrode exhibited high PC and PEC activities, in which 39.1% and 65.7 % of methyl blue (MB) could be mineralized, respectively. The high PC and PEC activities could be attributed to the highly nano-tubular structure and mixed crystallite composition, which could facilitate the separation and transfer of the photogenerated charge carriers.
Sustainment Engineering and Residual Life Prediction of Aluminum Alloy Structure at Service Environment
Authors: Zhang Qian , Liu Gang , Wu Cun Li
Published: March 2013

The effects of service environment will cause corrosion damage and fatigue cracks to initiate and grow, compromising structural integrity of the aircraft aluminum alloy structure. To develop an effective inspection and maintenance-scheduling program that takes advantage of life extension technologies, the sustainment engineering and residual life prediction method of aging aircraft aluminum alloy structure at service environment was proposed in this article. The whole algorithm of the sustainment engineering was described and the included situations of repairs, corrosion damage and widespread fatigue damage on aircraft structures were presented. At last, combining the results of FEM calculation with the AFGROW software of crack growth analyses, the residual life of corroded aluminum alloy structure was estimated.
Temperature Simulation of Aluminium Alloy Double-Arc Welding Process on Simplified Conditions
Authors: Ma Guo Hong , Zhang Zhao Yang , Ye Jia
Published: March 2013

In this paper we used ANSYS finite element software to simulate the temperature field in 7a52 aluminum alloy double-arc welding process and analyze the welding seam's forming characteristics. We conducted the welding temperature field numerical simulation in the same welding seam forming conditions by loading heat source of single-arc and double-arc separately, which used gauss heat source model and used voltage, welding current and speed as key parameters. The experiments indicated that the designed double-arc heat source model could generally represent the double-arc welding process. Compared with single-arc welding process, the double-arc welding had higher welding efficiency and narrower heat affected zone. Furthermore, the temperature of double-arc welding pool raised faster. All these advantages could improve the welding efficiency.
Thermoresponsive Ion-Imprinted Composite Hydrogels for Heavy Metal Ion Removal
Authors: Wang Jing Jing , Li Xian Ning
Published: March 2013

A novel thermoresponsive Cu(II) ion-imprinted composite hydrogel [Cu(II)-IICH] based on N-isopropylacrylamide (NIPAM) and aminated silica (SiO2-NH2) has been prepared by in situ free-radical polymerization using Cu(II) ion as template. The Cu(II)-IICH was used to remove heavy metal ions from aqueous solution at 20 and 40oC. The Cu(II)-IICH selectively bound the template ion above a critical gel transition temperature (CGTT) of crosslinked poly(N-isopropylacrylamide) (PNIPAM). The memory was fixed by shrinking above the CGTT, and was deleted by swelling below the CGTT. In order to study the reusability of the Cu(II)-IICH, the sorption-desorption cycles were performed for five times. The results suggested that the Cu(II)-IICH can be used for several times without significantly decreasing its adsorption capacity.
Comparison of Orthogonal Regression and Least Squares in Measurement Error Modeling for Prediction of Material Property
Authors: Ding Guo Liang , Chu Biao , Jin Yi , Zhu Chang An
Published: March 2013

A critical challenge in prediction of material property is the accuracy of estimation for regression coefficient between the structure or process of material and its macroscopic property. One source of the estimation errors is measurement errors which commonly exist in practice. To provide guidance on the use of simple linear regression methods in measurement error modeling for prediction of material property, we investigated and compared least squares (LS) and orthogonal regression (OR) theoretically. And their applications in prediction of tensile strength for quenched and tempered steel 45 were presented as an example. OR has better performance than LS in the prediction of material property in presence of measurement errors under certain conditions.
The Research for Work Roll Thermal Deformation of Cold Rolling Mill with Plastic Materials
Authors: Yu Peng , Li Sheng Li , Wang Jun Sheng , Song Lei
Published: March 2013

In this article, the factors which have influence on the work roll thermal deformation in cold strip rolling and the heat transferring mechanism are discussed. It is considered that there are three direc-tions, radial、axis and circumference, for heat transferring for work roll thermal deformation with plastic materials. Therefore, it is a three dimensions unstable system for work roll temperature field of cold strip rolling. The plastic deformation work and friction heat are calculated by the divided element and digital integration method. The simplified calculation model is built for the heat trans-ferring along work roll. There are four zones for work roll heat transferring: roll gap zone、air zone、emulsion zone、rolls contact zone. The heat transferring between the zones is decided by the temperature difference. The inter temperature field and thermal deformation of work roll can be calculated by two-dimension finite difference method. The work roll temperature and thermal crown of actual application cold rolling mill are analyzed by the model. By the comparison between calculated values and measured values, the work roll thermal calculation model can meet the accu-racy requirement of on-line control.
Preparation of the Corking both End Silica Nanotubes
Authors: Xie Zhi Fei , Hu Ting , Liu Ming Xing
Published: March 2013

The corking both end silica nanotubes were prepared with the functionalized silica nanotubes and dialdehyde starch nanoparticles（DASNP）by "schiff base" reaction. Moreover, these silica nanotubes were characterized by TEM or 29Si-NMR. The results would provide the material base for silica nanotubes delivery drug system.
Study on the Tribological Performance of AlN Nanoparticles Additive
Authors: Wang Heng , Wang Yu Min
Published: March 2013

By using Four-ball test machine, the anti-wear and extreme pressure performances of base oil that contain aluminum nitride (AlN) nanoparticles additive was investigated. The experimental results showed that nanoparticles additive can effectively improve extreme pressure and anti-wear performance of base oil, and the optimal concentration of it in the base oil is 3 wt%. AlN and T106 compatibility experiments showed that T106 can improve extreme pressure and anti-wear performance of AlN nanoparticles additive. Two additives have synergies to improve extreme pressure and anti-wear performance of base oil.
Nano-Illumination Based on Field Enhancement inside a Subwavelength Metallic Structure
Authors: Gu Min Ying , Wang Zeng
Published: March 2013

A subwavelength metallic slit is proposed to generate super-strong nano-illumination. We use the finite-difference time-domain method to present that character. By changing a subwavelength slit into several slits and fixing the total volume of the air slits, we found that the energy was enhanced in the nano-slits. The more nano-slits have the better effective of enhancement. The slits also make the output light beams focusing. Because of the successive enhancement processes, the light from the nano-slit could become hundred times stronger than the incident light and accordingly could have great potentials for applications in optical data storage, super-resolution imaging, lithography, photonics, and other applications that need nano-illumination.
Preparation and Characterization of mPEG Modified Magnetic Long-Circulating Doxorubicin Hydrochloride Liposomes
Authors: Fang Yu , Wu Xiu Gen , Chen Jin , Dang Sheng Chun , Jiang De Li , Chen Min , Xie Ji Min
Published: March 2013

In this work, long-circulating doxorubicin hydrochloride (Doc) liposomes were prepared by the of ammonium sulphate gradients with ethanol injection, and the methoxy polyethylene glycol (mPEG) was added to modify the membrane property of the liposomes. The long-circulating mPEG-modified Doc liposomes were nearly round with a particle size ranging from 50 to 70 nm. The entrapment efficiency of Doc was determined to be 57.53 %. Meanwhile, the experiment results indicated that the long-circulating Doc liposomes show good sustained release property.
Strength and Drying Shrinkage of Pavement Concrete with Nano-Particles
Authors: Zhang Mao Hua , Wang Hong Guang
Published: March 2013

With the development of national economy in Mainland China, the heavier vehicles and traffic flow have arisen in highway transportation. Concrete pavement has high strength and good durability, and thus is widely used in high-grade highway. Due to the small dimension, nano- materials have many unique physical and chemical properties, and become the focus of material science field. In this thesis, based on the unique characteristics of nano-materials, the ordinary concrete with nano-SiO2 or nano-TiO2 is prepared to research the drying shrinkage of pavement concrete. The test results indicate that the concrete with nano-SiO2 and nano-TiO2 in the amount of 2.0% and 1.0% by weight of binder have the respectively biggest drying shrinkage rate of the same concrete type, which are significantly increased than the ordinary concrete. After 28 days, the dying shrinkage rate of the concrete with nano-TiO2 is 1.6 times to the ordinary concrete.
Nanocellulose Applications in Environmental Protection
Authors: Jin Shu Fang , Chen Ying , Liu Min
Published: March 2013

Nanocellulose has attracted a great deal of interest as a source of nanometer-sized materials because of their biodegradability, easy availability, and the related characteristics such as a very large surface-to-volume ratio, and outstanding mechanical property. This article assembles the current applications of nanocellulose, which has been used as adsorbent for heavy metals, and reinforcement for biodegradable materials. Furthermore, the article provides possible applications of nanocellulose, especially, in the environmental protection field.
One-Step Synthesis of Nano-Size Iron Oxide /Three-Dimensional Wormlike Hierarchical Mesoporous SiO2 Catalysts and its Catalytic Performance on Phenol Hydroxylation
Authors: Wu Jia Feng , Zhao Yu Mei , Liang Peng
Published: March 2013

A series of nano-sized iron oxide supported on 3D wormlike hierarchical mesoporous SiO2 catalysts were synthesized by one-step hydrothermal synthesis. The samples were characterized by XRD, N2 sorption, FT-IR, UV–Vis, TEM and ICP-AES. The catalysts were probed for the oxidation of phenol employing hydrogen peroxide. The results indicate that the materials exhibit high surface area and 3D wormlike hierarchical pore, iron ions exist as isolated framework species when the weight percentage content of iron is below 0.24 and nano-size iron oxide is dispersed in the surface (iron content above 0.24 wt%). Catalytic performance indicates that nano-size iron oxide supported on SiO2 is useful to enhance both the catalytic activity and the selectivity of target products compared with isolated iron species.
Research on the Influence of Salt Fog Corrosion Behavior of 6005A Aluminum Alloy Welded Joints by Environment Humidity
Authors: Xia Ning , Zhu Zhi Min , Chen Hui
Published: March 2013

6005A aluminum alloys were welded at different relative humidity conditions. The effects of relative humidity on the salt fog corrosion of the welding joints were researched. The results showed that the weight loss of the joints after 14 days corrosion was higher than that corroded after 7days, but the corrosion rate was lower. The corrosion rate first increased then declined with the increase of environmental humidity for the joints corroded for 7days. However, when the environmental humidity was 80%, corrosion rate achieved the maximum, when environment humidity was 70%, corrosion rate was the lowest. After corroded for 14 days, corrosion rate was the maximum when the environmental humidity was 50%, and it was the lowest when the environmental humidity was 90%. The tensile strength declined obviously after corrosion.
Corrosion Behavior of Ultra-Fine Grain Chromium Bronze Prepared by Equal-Channel Angular Pressing in HCl Solution
Authors: Zhang Ya Ni , Xu Tian Han , Wang Dang Hui
Published: March 2013

The corrosion resistance of Ultra-fine grain (UFG) chromium bronze, prepared by Equal-channel angular pressing (ECAP) processing, was investigated in HCl solution at room temperature and atmospheric pressure by electrochemistry technique and immersion experiment. The results shows that the corrosion potential of chromium bronze is decreased with ECAP processing. But the corrosion resistance is deteriorated slightly. According to the immersion tests, the weight-loss of UFG chromium bronze, compared with its counterpart, is higher in the initial stage and lower in the later stage, and the gap is in the range of 5%-15%. The corrosion mechanism on the UFG chromium bronze is deduced from the experiment data and corrosion morphology.
Non-Injection One-Pot Synthesized Lanthanide Ions Doped CdSe Nanocrystals with their Energy Transfer
Authors: Zhang Dan , Zhang He , Sun Cheng Xun , Zhu Bao Yu
Published: March 2013

The OA protected, Eu doped CdSe nanocrystals (NCs), which optical property could be control by temperature and reactant molar ratio, were prepared by non-injection one-pot synthesized method. And after modifying TTA, the Eu doped NCs showed energy transfer from NCs to Eu. The size, crystal structure, composition and the optical property of product were further studied in detail by TEM, PL, UV, XRD and EDS. The Eu doped NCs with excellent lanthanide characteristic fluorescence were possessed many potential applications in various fields, such as biological labeling, immunoassays, optical sensing, and so on.
Determination L-Arginine from Grape Juice with Sakaguchi Reaction
Authors: Liang Xin Hong , Sun Jun Liang , Chen Song Ling , Fan Ying Bin
Published: March 2013

Arginine in grape juice can be metabolized by wine yeasts to precursors of ethyl carbamate. The aim of this study was to develop a simple, accurate and fast method for determining arginine in grape juice by separating L-arginine with strong cation-exchange resins. The results showed that the optimized parameters as follows: 16g of pretreated resins packed in a glass column (D1.0×30cm), and 10.0mL of testing sample (pH = 2.0) added to the columns, kept for 20min at 20°C, then rinsed with pH 8.0 buffer solution. Finally, it was eluted with 300 mL 1 mol•L-1 NaOH at the rate of 2mL mol•min-1. The optimized method in combination with Sakaguchi reagents was simple, reproducible and accurate. This method can be applied for quick and fast determination of arginine in grape juice to take necessary action and avoid the forming of ethyl carbamate.
Effect of Folin Reagent from Different Sources on Protease Determination
Authors: Sun Jun Liang , Liang Xin Hong , Chen Song Ling , Fan Ying Bin
Published: March 2013

Folin reagent was one of the most important reagents in protease determination. The differences between Folin reagent from laboratory and Folin reagent sold were studied. The results showed that there was not significant difference between the absorbance of Folin reagent from lab replaced 30d and Folin reagent sold (p<0.05). The RSD of Folin reagent from lab was between 0.3and 1.67, and Folin reagent sold between 0.63 and 1.49. The precision of them was both higher. The maximum absorption wave length of the chromogenic agent of Folin reagent was with 736-755. And there was no significant difference of the value of the same sample protease between both Folin reagent (p<0.05). Folin reagent from lab based on GB/T23527-2009 was perfect.
Research on Magnetic Separation Methods for the Extraction of Nucleic Acids
Authors: Xiao Yang , Wang Chao Hui , Li Xin , Wang Bin
Published: March 2013

The magnetic separation system is an important part of the automatic testing equipment. There are two methods to magnetize, internal magnetic attracting and external magnetic attracting. We compare the difference of the realization methods and the magnetic field distribution of the two ways. Then we select appropriate method to magnetize.
Study on Production of Concrete Small Hollow Block with Recycled Aggregate
Authors: Li Qi Jin , Li Guo Zhong
Published: March 2013

The construction waste was processed into recycled aggregate and was used to substitute for natural aggregate to produce concrete small hollow block with grade of MU7.5. The effect of grain composition, replacement ratios and chemical activator of recycled aggregate on compressive strength of concrete small hollow block was studied. The results shows that through optimized grain composition of recycled aggregate and mixed with appropriate chemical activator, the compressive strength of concrete small hollow block with 100% recycled aggregate can be satisfied with the requirement of MU7.5 concrete small hollow block.
Thermodynamics-Based Alloy Design and Application for Toughening in High Strength High Toughness Cold Work Die Steel
Authors: Li Shao Hong , Wu Xiao Chun
Published: March 2013

The ledeburite carbides segregated seriously in solidification of Cr12 tool steels and the morphology is distributed in banding with fishbone shapes resulting in low toughness. Thus the tools are usually failure with tipping, fracture and collapse in services. A new high strength and high toughness tool steel was developed to adapt for the requirement of high strength materials forming. The thermodynamic theory and equilibrium principle of carbon as well as computer aided optimizing design are used in.
The Electrochemical Analysis of Trace Titanium Addition to the High Pure Zinc Electrode in Seawater
Authors: Sun Li Juan , Sun Hu Yuan , Cao Kun , Yan Rui Hua
Published: March 2013

High pure zinc with trace titanium of various contents was prepared by the method of master alloy preparation, and electrochemical characteristic difference in seawater was discussed. The result reveals that there is a minimum of self corrosion current density at 0.04% titanium content in high pure zinc in seawater of Qingdao seashore, and trace addition of titanium may increases the potential stability but not change the corrosion behavior of high pure zinc in seawater.
Effect of Polishing Treatment on Rumpling of Oxide Scales on NiPtAl Coatings with Different Pt-Content
Authors: Song Peng , Lu Jian Sheng
Published: March 2013

Pt-modified nickel aluminide coatings have been more widely used for protection of jet-engine components against high-temperature oxidation. The coating rumpling of two Pt-content NiPtAl coatings was studied in this paper during high temperature exposure. The results indicated that the NiPtAl coating grains size made a great contribution to the oxide surface morphologies, especially rumpling. Smaller grain size within high-Pt coating indicated a denser rumpling compared to low-Pt coating due to PtAl2 formation in the earlier coating. The failed local alumina at the ridges was also found on the low-Pt coating after cyclic oxidatioin. It was found that polished treatment resulted a comparatively flat and homogeneous oxide layer compared to as-received coatings. The temperature cycling could promote the aluminide coating rumpling, however, the polished treatment could not completely eliminate the roughening.