bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of the Chemical Compositions of KF-CsF-AlF3 Middle Temperature Aluminum Flux on Melting Characteristics
Authors: Cheng Fang Jie , Yao Jun Feng , Wang Ying , Yang Jun Xiang , Zhang Guan Xing , Long Wei Min
Published: July 2013

According to the KF-CsF-AlF3 ternary phase diagram, 25 samples (named group A) near the region around the E4 and E5 (ternary eutectics points), and 22 samples (named group B) near another region around the e5 (binary eutectic point) and m2 (ternary eutectics point) were prepared by the wet synthesis method. The melting curves of these samples were measured by differential scanning calorimetry (DSC). Based on the DSC data, the effects of the fluxs compositions on the melting characteristics were analyzed and summarized. The results indicated that the lowest solidus of group A samples was about 480°C, meanwhile, their liquidus was about 520~530°C, and the melting range was approximately 40°C. Furthermore, when the content of CsF was lower than 18mol%, the solidus of group A samples apparently rose to about 510°C, but the liquidus did not change greatly. The lowest solidus of group B samples was about 420°C, meanwhile, their liquidus was below 450°C, and the melting range was approximately 20~30°C. So, with this profile of melting characteristics, some of the samples of group B flux would be good substrates for aluminum alloy middle temperature brazing, with good prospects for application.
The Research on Sintering Behavior of the Lightweight Aggregate Utilizing Reservoir Sediments
Authors: Huang Chung Ho , Huang Hsien Yu
Published: July 2013

Taiwan Shi-Men Reservoir sediments were used to investigate the expansion mechanism of lightweight aggregate under high temperature sintering processes. The fundamental properties of reservoir sediment and the effects of temperature and time during the sintering process are obtained. Experimental results show that the Shi-Men Reservoir sediment is a very good raw material to be the production of lightweight aggregate. The controlling of the temperature and time during the sintering processes has significant effect on the particle density and absorption of the lightweight aggregate. The feasibility of the major expanded material in reservoir sediments may be due to the decomposition of the carbonate, the organic matter and crystallization water.
Copper Protection by SAM and Low Temperature Bonding for 3Dimentional Integration
Authors: Ghosh Tamal , Dutta Ashudeb , Singh Shivgovind
Published: July 2013

3Dimensional Integration can solve many challenges which are being faced by modern planer integration. The major bottleneck of 3D-Integration are contamination and Copper surface oxidation which is the cause of the requirement of high temperature while bonding. Reduction of this high bonding temperature is the key challenge of 3Dimensional Integration. In this research work we investigate and compare the Copper surface protection characteristic of Self-Assembled Monolayer (SAM) of Alkyl Thiol having different Carbon chains (C6,Hexanethiol and C12, Dodecanethiol). We also study the thermal desorption of these SAM layers. SAM can minimize the oxidation of the Copper which acts as a bonding medium. By thermal desorption the pure Copper surface is brought back and exposed. Finally Copper-Copper thermocompression bonding is performed in different conditions and compared.
New Reactor Fabricated Using Light Leakage Fiber for Azo Dye Degradation
Authors: Yu Tao , Wang Hong Mei , Tan Xin
Published: July 2013

Lanthanum-doped anatase TiO2coatings, which are composed of assemble crystalline of 50 nm diameter particles, when the percentage of dopant is 0.5 wt%, have been successfully fabricated by solgel dip-coating process on light leakage silica fiber (LSF) which length is 15cm and diameter is 125μm. This was achieved by adjustment of the lanthanum-doped solgel parameters such as molar ratio of precursors in lanthanum-doped TiO2-sols, the ratio of titanium tetrabutoxide to polyvinyl alcohol, dip-coating velocity, drying duration in air, thermal treatment and number of cyclical time of the process. Titania nanocrystals were prepared at ambient temperature in a liquid media using titanium tetrabutoxide as precursor, and the crystallization of amorphous precursor was preceded by peptizing with acid and then refluxing for a periodic time in homothermal water-bath. The photocatalytic properties of the La-TiO2films had been testified by the photo degradation of methyl orange. The lanthanum-doped anatase TiO2thin films were characterized by XRD and TEM. The products show much improved photocatalytic activity that will be useful in the design of a novel antibacterial, deodorant and antipollution new photo reactor.
Hydrogen Storage in MOF-5 with Fluorine Substitution: A van der Waals Density Functional Theory Study
Authors: Huang Yue , Ke San Huang
Published: July 2013

Physisorption of hydrogen molecules in metal-organic frameworks (MOFs) provides a promising way for hydrogen storage, in which the van der Waals (vdW) interaction plays an important role but cannot be described by the density functional theory (DFT). Using the vdW density functional (vdW-DF) method, we perform ab initio calculations for the MOF-5 crystal with one or multiple H2 adsorbed in its primitive cell. It is found that the binding with the organic linker is much smaller than with the metal oxide corner, which limits the H2 loading. We show that this can be improved significantly (from 5.50 to 10.39 kJ/mol) by replacing the H atoms of the organic linker with F atoms which causes extra electrostatic interaction.
Effects of Aspect Ratio of Carbon Nanotubes on Crystallization Behavior of Polylactide Composites
Authors: Xu Zhao Hua , Li Heng
Published: July 2013

Biodegradable polylactide (PLA) composites/pristine multiwalled carbon nanotubes (P-CNT) composites with three different aspect ratios (length to diameter) are prepared by coagulation method. Isothermal crystallization and morphology of neat PLA and its composites are further investigated to clarify the effects of aspect ratio of CNT on the crystallization behaviors of PLA in its composites. Results show that the different aspect ratio CNT exhibit substantially different effects on PLA crystallization. It is interesting to find that small aspect ratio CNT (CNT-S) greatly promotes nucleation rate than big aspect ratio CNT (CNT-L).
Process and Study of Hydrotalcites Synthesized by Chemical Coprecipitation at Vacuum, and its Use for Absorption of Agroindustrial Herbicides
Authors: Santoyo Héctor Hugo Rodríguez , Figueroa Beatriz González , Lozano Rodrigo Escalera , Camacho Beatriz Ruiz
Published: July 2013

The aim of this work was focused on developing a hydrotalcite by chemistry coprecipitation, which one was tested with one agricultural herbicide used in the region of the "Bajío" of the state of Guanajuato in Mexico. The clay was synthesized by a method by chemical precipitation at vacuum, and it was exposed to an herbicide for cultures control. The results showed that the hydrotalcitestructure and the toxic basicity, define their absorption in the hydrotalcite, performance fulfilling a function of soil recuperation.
Aluminum Oxide Nanoparticles Upregulate ED1 Expression in Rat Olfactory Bulbs by Repeated Intranasal Instillation
Authors: Li Xiao Bo , Liu Ran , Liang Ge Yu , Yin Li Hong , Zheng Hao
Published: July 2013

Respiratory route is one of the major exposure routes to nanoparticles. The environmental agent aluminum is intensively investigated for the association with development of neurodegeneration. To evaluate potential neurotoxicity induced by aluminum oxide (Al2O3) nanoparticles, male rats were intranasally instilled with 0.1 or 1 (Al) mg/kg nanoAl2O3 or aluminum chloride (AlCl3) every two days for 60 days, using pure water as vehicle control. Neurotoxicity effects were determined by behavioural studies and immunohistochemistry staining of ED1 and beta-amyloid precursor protein (Aβ). Neither of nanoAl2O3 treated groups showed significant alterations in Morris water maze tests, however, increased escape latency were observed in 1mg/kg AlCl3 treated rats. Further, upregulation of ED1 expression were showed in olfactory bulb of 1 mg/kg nanoAl2O3 and AlCl3 exposed rats. Massive Aβ expressions were observed in whole brain of 1mg/kg (Al) AlCl3 treated rats. ED1 expression is a marker of microglia/macrophages activation, suggesting stimulus of Al2O3 nanoparticles to microglia/macrophages located in olfactory bulb and perivascular areas. In these studies, Al2O3 nanoparticles didnt show any alterations on spacial learning behaviours of rats and expression of Aβ of neuron, therefore, display lower neural effects than AlCl3.
Research on Preparation Technique of C100 Ultra-High Performance Self-Compaction Concrete
Authors: Xu Li Bin , Feng Nai Qian , Bee Ch'ng Guan
Published: July 2013

Self-compaction concrete is a new green concrete featuring self-leveling, self-compaction, low noise and low consumption of labor force. Nowadays, a large number of super high-rise buildings (h>400m) are under construction around the world, the complicated structures and dense reinforcement placement has brought numerous inconveniences to construction of concrete. Research on high strength / ultra-high strength self-compaction concrete thus becomes a hotspot. The porous structure of zeolite powder can help absorb the water reducing agent and then release it slowly in concrete mixture. With the low slump loss it produces, the prepared C100UHP-SCC can resist slump loss for over 3 hours. Test of super-high pumping at a height of 411m is carried out in the West Tower program at Pearl River New Town of Guangzhou (the building height is 441m). Drilled core test for L-shaped component indicates a dense internal structure, so it has a desirable self-compaction and capacity to pass through dense reinforcement.
Influence of Deposition Time and Source-Substrate Distance on Properties of CdTe Thin Films Using Close-Spaced Sublimation at Higher Source Temperature
Authors: Dai Xiao Yan , Shi Cheng Wu , Zhang Yan Ru , Yao Min
Published: July 2013

In this paper, CdTe thin films were deposited on soda-lime glass substrates using CdTe powder as a source by close-spaced sublimation at higher source temperature of 700°C. The influence of the deposition time and the source-substrate distance on the chemical composition, crystal phase, surface morphology and optical band gap of CdTe thin films was systemically investigated by energy dispersive X-ray spectroscopy, X-ray diffraction, scanning electron microscope and the ultraviolet-visible-near infrared absorption spectra, respectively. At the deposition time of 60 min and the source-substrate distance of 5 mm, the CdTe thin films had pyramid appearance with the grain size of 15 μm.
Modification of Epoxy Asphalt by Hyperbranched Polyester
Authors: Xu Pei Jun , Cong Pei Liang , Ye Huan , Chen Shuan Fa
Published: July 2013

Epoxy asphalt is a thermoset material used in paving industry with good properties in hot environments. However, it is still a brittle pavement in cold environments. Hyperbranched polyester (HBP), which has the characteristics of highly branched structures, massive functional end groups and low viscosity, was used as an active modifier for epoxy asphalt to improve its toughness and processability. It can be found that lower viscosity, higher tensile strength and elongation at break of HBP modified epoxy asphalt than those of epoxy asphalt can be obtained. Modulus of HBP modified epoxy asphalt higher than that of neat epoxy asphalt also indicate the improved stiffness of epoxy asphalt with the introduction of HBP.
Self-Healing Epoxy Composites – Part I: Curing Kinetics and Heat-Resistant Performance
Authors: Yin Tao , Rong Min Zhi , Zhang Ming Qiu
Published: July 2013

This paper reports a study of self-healing epoxy composites. The healing agent was a two-component one synthesized in the authors laboratory, which consisted of epoxy-loaded urea-formaldehyde microcapsules as the polymerizable binder and CuBr2(2-MeIm)4 (the complex of CuBr2 and 2-methylimidazole) as the latent hardener. Both the microcapsules and the matching catalyst were pre-embedded and pre-dissolved in the composites matrix cured by 2-ethyl-4-methylimidazole (2E4MIm), respectively. The data of curing kinetics show that the latent hardener CuBr2(2-MeIm)4 is not affected during the curing process of 2 h at 80°C, 2 h at 120°C and 2 h at 140°C, and heat deformation temperature of composites consisting of 2 wt% CuBr2(2-MeIm)4 and 5 wt% mcirocapsules cured at the same curing process is 180.2°C.
The Annealing Behavior of cryoECAP Processed Pure Aluminum under High Magnetic Field
Authors: Li Xie Hua , Cao Yi Heng , He Li Zi , Guo Ya Ping , Cui Jian Zhong
Published: July 2013

The property and microstructure of pure Al prepared by the cryogenic ECAP after annealing at different temperatures and times with and without the application of 12T high magnetic field were investigated by hardness test and optical microscopy observation. The results show that with the application of high magnetic field, the hardness of cryo-ECAPed pure Al is lower than that of material annealing without high magnetic field. The high magnetic field accelerates crystallization of cryo-ECAPed pure Al during annealing.
Research on Synthetic Quartz Crystal Quality
Authors: Zhang Xiao Jie
Published: July 2013

The quality of two synthetic quartz crystals, Z lump and Y bar, was researched by the infrared spectrophotometer technology and chemical spectral analysis in this study. The relationships between typical impurity OH and other impurities such as Fe, CO and Mg were discussed which impacted the quality of artificial rock crystal; the defects in artificial rock crystal and crystals, such as lattice dislocation and distortion with a close relation appear at the same time and impact the quality of synthetic quartz. The work in future should begin from the following two aspects in order to improve synthetic quartz crystal quality: the one is to further study the crystal structure characteristics and to explore the cutting type of crystal with convenient cultivation and processing process, high use ratio and high Q value. For example, the research is to make the Z area of Y bar crystals bigger and the other areas smaller or disappear. The other one is to improve the existing technological level and to reduce defects.
Structural Effect on the Tree-Shaped Flow in the Nanoscale Network of Wool Fiber
Authors: Fan Jie , Zhao Lian Ying , Ma Chong Qi , Liu Yong
Published: July 2013

The effect of the nanoscale fractal tree-shaped network on the fluid permeation in wool fiber driven by capillary force was investigated in this paper. The fluid permeation obeys murrays law, and the permeation efficiency highly depends on the fractal dimension of the channel length. A better understanding of the mechanism of structural effect on the tree-shaped flow in the nanoscale fractal network of wool fiber could help the further design of bio-mimetic artificial fiber and functional fabric.
Novel Profile Control Treatment Using Pore-Scale Polymer Elastic Microspheres
Authors: Li Lei , Gao Xue Mei , Lei Guang Lun , Wei Xiao Dong
Published: July 2013

In order to solve the deep profile control problem and improve oil recovery of the oilfield, a novel profile control agent pore-scale polymer elastic microspheres (PSPEMs) was synthesized. The swelling property of PSPEMs in aqueous solution was analyzed. Core flow test and double-tube sand pack models were used for studying profile control and flooding performance of PSPEMs in oil formation. The results show that PSPEMs have good swelling property in aqueous solution with high salinity, high temperature and high pressure. Fig 5 and Fig 6 show that PSPEMs are better than polyacrylamide polymer on profile control. Table 1 indicates PSPEMs can improve water injection profile of heterogeneous formation effectively and plug the high permeable layer first. The higher the concentration of PSPEMs, the shorter the time it spends to realize profile control. The results also confirm that use proper concentration of PSPEMs, the profile control efficiency can increase enormously.
Surface Finish Assessment of Polishing Process of Tool Steels by Abrasion, Using Diamond and Alumina Particles
Authors: Zanatta André Marcon , Bressan José Divo , de Oliveira Gomes Jefferson , Origo Fábio Dondeo , Damião Alvaro José
Published: July 2013

The present work investigates the surface finishing of two mould tool steels (WNr 1.2738~P20 and WNr 1. 4305) after polishing by conventional method and automatic laboratory equipment. These steels are employed in the fabrication of polymer injection moulds due to its good machinability, homogeneous microstructure and hardness. The polishing process was performed in laboratory by manual and automated processes. The surface finishing was measured by mechanical and optical methods. In the manual polishing, SiC paper grit 320, 600 and 1200 was used. Final polishing was carried out with polishing cloth containing 0.3 μm alumina suspension or 6 μm and 1 μm diamond suspension. Alternately, polishing of steel specimens in the specially developed laboratory automatic equipment was performed using a large rotating disc at 140 rpm, nominal pressures of 0.013 Pa, 0.139 Pa and 0.244 Pa and diamond paste with particle size 1 μm. Surface finish of specimens were compared as a function of the particle size and polishing time by three methods: the roughness parameter Rz (mean of maximum roughness depth) using a stylus probe, light reflectance with an integrating sphere connected to a spectrophotometer, and reflected diffuse light intensity analysis of a He-Ne laser. Specimen surface images were also obtained by an optical microscope to compare the topography after polishing. From the plot of roughness measurements versus particle size and intensity of diffuse light versus particle size, it was observed that both roughness parameter Rz and the intensity of diffuse light decreased linearly with the abrasive particle size for the manual polishing method. The method of light reflectance measurements shows an approximately constant value of 55 % for all particle size. Therefore, the better methods to assess surface finish of tool steels are the roughness parameter Rz and the intensity of diffuse light by laser method. For the automatic polishing, the results show that there is an optimized time for minimum roughness which is 5 minute. Other relevant aspects of surface finish by particle abrasion are also discussed.
Evaluation of Wear Behavior of Wheel Steel Using Twin-Disc Test
Authors: Seo Jung Won , Kwon Seok Jin , Lee Dong Hyeog , Choi Ha Yong
Published: July 2013

The wheel/rail contact is chracterized by high contact forces and small contact areas. Although the standard of railway wheel has sustained, the damages of railway wheel have been occurred in service running. The railway wheel damage can be divided into three types; wear, contact fatigue failure and thermal crack due to braking. In curves, especially, large sliding on the contact patch occurs at the wheel tread and flange. Due to this sliding, wear increases in the wheel/rail contact under the dry condition. To reduce wear, more durable wheel steels are required. In order to develop new materials and predict wear, It is important to understand the wear mechanism in wheel steels. In this study, we have investigated the wear characteriscs of RSW1 railway wheel steel using twin disc wear testing. Also the comparative wear behavior of RSW1 and R7 wheel steel under rolling-sliding contact was performed.
Antitumor Activity of Porcine Cartilage Polysaccharide on Breast Cancer
Authors: Fang Jing Jing , Liu An Jun , Zhu Zhen Yuan , Teng An Guo , Zheng Guo Qiang , Wang Wen Hang , Rong Qi , Qi Yu Gang
Published: July 2013

The antitumor activity of porcine cartilage polysaccharide was evaluated by vivo animal models. The Ca761 tumor-bearing mice were treated with daily intraperitoneal injections of normal saline (control group) or cartilage polysaccharide (1500, 3000 or 4500mg/kg CPS group) for 14 days. The results demonstrated that CPS could effectively inhibit the tumor growth in Ca761 tumor-bearing mice. The tumor weights of the CPS groups were smaller compared to the control group. While the thymus index, spleen index were higher in the high dose 4500mg/kg CPS group than the control group. These results suggest that CPS might be a strong natural immunomodulator and the antitumor effect of this polysaccharide is associated with its potent immunostimulating effect.
Evaluation of Mercury Contamination in Surface Sediments of Southern Kaohsiung Harbor, Taiwan
Authors: Dong Cheng Di , Chen Chih Feng , Chen Chiu Wen
Published: July 2013

Total mercury (T-Hg) concentration was determined to evaluation the distribution, enrichment, accumulation and potential ecological risk of mercury contamination in the surface sediments of southern Kaohsiung Harbor, Taiwan. Sediment samples from 12 locations located between the river mouths (i.e., Jen-Gen River and Salt River) and harbor entrance of southern Kaohsiung Harbor were collected and characterized for T-Hg, aluminum, water content, organic matter, and grain size. Results showed that the T-Hg concentrations varied from 0.190.45 mg/kg with an average of 0.28±0.09 mg/kg. The spatial distribution of T-Hg reveals is relatively high in the river mouth region, and gradually diminishes toward the harbor entrance region. This indicates that upstream industrial and municipal wastewater discharges along the river bank are major sources of Hg pollution; and Hg may drift with sea current to be dispersed into open sea. Results from the enrichment factor (EF) and geo-accumulation index (Igeo) analyses imply that the sediments can be characterized between moderate and moderately severe degree enrichment and between none to medium and moderate accumulation of Hg, respectively. Results of potential ecological risk index indicate that the sediment has higher to high ecological potential risk.
Analysis on Sealing Method and Sealing Materials of Gas Drainage Borehole
Authors: Ye Qing , Jia Zhen Zhen , Pi Yan , Wang Hai Zhen
Published: July 2013

With the increase of gas drainage volume and gas drainage requirement of coal seam in China, more and more attention to gas drainage effect of coal seam is paid. The gas flow law and borehole sealing mechanism are briefly described, the borehole sealing technologies of different materials are analyzed and the requirements are obtained as follows: 1Sealing materials shall have permeability. 2Sealing materials shall have expansion. 3The strength and hardness of sealing material can not be too high. 4Sealing materials are compact; sealing materials shall have certain strength. 5Sealing materials can be obtained easily and their price shall be low. 6Sealing process is simple and is constructed easily. Finally, the high polymer foam sealing technology, the mechanical elastic sealing technology, borehole packer sealing technology, the new pressure grouting hole sealing technology, yellow clay borehole sealing technology and rubber ring (or capsule)-sealing fluid sealing technology are briefly analyzed, the advantages and disadvantages of the borehole sealing method and the sealing materials used in coal mines in China are summed up. The results can provides the reference for selection of borehole sealing methods and sealing materials of gas drainage in coal mines.
Resonance Rayleigh Scattering Study of the Interaction between Surfactant and Silver Nanoparticles
Authors: Wen Gui Qing , Chen Yuan Yuan , Jiang Zhi Liang
Published: July 2013

In the presence of sodium dodecyl benzene sulfate (SDBS) and under the irradiation of microwave, silver nitrate was reduced by alcohol to prepare stabile green and yellow silver nanoparticles in size of 41 nm and 71 nm respectively. Yellow silver nanoparticles have two resonance Rayleigh scattering (RRS) peaks at 440nm and 465nm. Green silver nanoparticles exhibit three RRS peaks at 420nm, 465nm and 585nm. Gray nanoparticles, which prepared in absence of SDBS, show a strong RRS at 465nm. Silver nanoparticles modified by dodecyl benzene sulfate (DBS) can react with cationic surfactant to exhibit novel RRS property. The concentration of some cationic surfactants is liner to the enhanced RRS intensity at 465nm.
Polyhedron Biosensor Based on the Surface Plasmon Resonance Technology in Heterodyne Interferometry
Authors: Wang Shinn Fwu , Ma Hao , Kao Fu Hsi , Liu An Li
Published: July 2013

In this article, a polyhedron biosensor based on the surface plasmon resonance technology in heterodyne interferometry is proposed. The sensor is designed as the polygon prism that is made of BK-7 glass with the refractive index of 1.51509. As a heterodyne optical source is launched into the biosensor, the phase difference between s-and p-polarization components can be obtained. The related parameters of the tested medium can be achieved after some calculations. The best resolution of the sensor can reach 5.5×10-7 refractive index unit (RIU). The polyhedron biosensor has some merits, e.g., a simple optical setup, easy operation, high measurement accuracy, high resolution, high sensitivity, and in real-time test, etc.
Dynamic Modeling and Calculation of a Belt Drive System Incorporating Frictions among Pulley-Pivot Surfaces
Authors: Zhang Jin Fu
Published: July 2013

The motion equations of a belt drive system incorporating frictions among pulley-pivot surfaces are established. In deriving the equations, theorem of the motion of the center of mass and differential equation of rotation of rigid body with a fixed axis are used. In a case study, the motion responses of a belt drive system with and without frictions among pulley-pivot surfaces are numerically simulated, respectively. The numerical results show that the frictions have significant influence on the motion of the belt drive system.
Monitor for the Construction for Extra Large Solder Ball Grid Roof
Authors: Chen Hai Zhou , Wang Yu Ling , Zhang Xiao Yong , Xie Gang Kui , Ma Rong Quan , Zhang Qi Lin
Published: July 2013

There are six key points, such as steel truss column, hoisting frame, hoisting point, wire rope, wire rope connecting in the hoisting system which we construct the COMAC ministry of installed plant. This timely monitoring of several key points in the promotion process is to enhance the process controlled several indicators. For different key points used different monitoring methods for monitoring. The results showed that 6 monitoring method is reasonable, feasible. This method can provide some experiences to the construction and fabrication of the steel member of the project.
Study on Fire Accident of Cotton Plant Based on L-R Fuzzy Numerals
Authors: Zhang Jin Feng , Zheng Yan Min
Published: July 2013

A reliability analysis on fire accident was made by using the L-R fuzzy number with the function of fuzzy fault tree theory. According to the statistics of running condition of field equipment and the fuzzy information provided by expert experience, the fault tree of fire accident in the cotton plant was built, and the fuzzy probability distribution of the explosion was gained. The structural importance of each basic event also was analyzed, and the most important factors which influence the system were established. It provides a new way and means for the safety analysis of the system and preventing fire accidents.
The Influence of Different Stress States on 16MnR Deformation Capacity
Authors: Zhao Shi Lei , Zhang Yi Liang , Jiang Gong Feng
Published: July 2013

16MnR is the typical material of pressure equipment which worked under complex stress state in engineering application. In order to be close to the actual combined tension-shearing stress state and explore the relationship of deformation capacity and different stress state, many groups of combined tension-torsion tests on 16MnR specimens were designed and the equivalent stress-strain relation under different stress state was obtained. The concept of stress triaxiaty (TS value) was cited to characterize the different stress state and the result showed different stress states have a great influence on the material plastic deformation capacity, TS value turns larger, the plastic deformation weakened; 16MnR has a strongest plastic deformation capacity in pure torsion; the level of tensile stress had no significant effect on the maximum stress in the biaxial stress state, but has a significant inverse relationship with the maximum equivalent strain .At last, the mathematical relationship between maximum equivalent-strain and stress triaxiaty could be found. If the stress state of one point in the engineering structures is certain, the maximum equivalent-strain can be estimated.
Studies in the Processes of Novel Silk Transfer Printing
Authors: Li Qing , Chen Guo Qiang , Xing Tie Ling
Published: July 2013

The process of novel silk transfer printing included the heat-press and steaming. The temperature and pressure in the heat-press process achieved the tight adhesion between the transfer paper and silk, which also obviously affected the dye penetration in the fiber. This adhesion was the most curial precondition to transfer dye effectively, to obtain an ideal penetration, the temperature and pressure should be controlled to 95~115°C and 3~6Mpa, respectively. The steaming realized the dye transfer and dye fixation. The steaming saturation influenced the K/S value of face prints and penetration greatly and was suggested to keep 80%~98%. Moreover, the temperature and time in the steaming were better in the rang of 100~110°C and 10~25min, respectively.
Transient Thermal Analysis of Spin-Flash Dryer Agitating Blade
Authors: Deng Yong Sheng , Zhou Tao , Zhou Yong Sheng , Ji Xiang Lei
Published: July 2013

The working condition of the spin-flash dryer agitating blade is complex, and influencing factors of the blade strength are quite more. In order to research its mechanical properties under the condition of transient high temperature, the analysis of thermal structure coupling field was performed. By the analysis of thermal stress and thermal deformation, the agitating blade would be designed well.
Testing and Analysis on Subway Station Structure under Dynamic Vibration Loads
Authors: Zhou Yao , Pan Hao , Wang Yuan Feng
Published: July 2013

Structure health monitoring system is used to monitor structural responses in real time. Dynamic performances of subway station structures are help to analyze seismic performances of the structures. Through structure health monitoring system of a subway station structure, dynamic responses of the subway station structure were tested under railway loads. The dynamic strain and internal forces of subway station structure are obtained. As restrained by earth, dynamic responses of the subway station structure is not significant change from most surface structures. Wavelet and multiscale analysis can be a powerful tool for multiple decomposition of potential fields data. Wavelet analysis can eliminate the noise for a clear data. The main train induced vibration frequency is also acquired through the method of wavelet analysis.
Ductile Fracture Criteria in Prediction of Chevron Cracks
Authors: Petruška Jindřich , Kubík Petr , Hůlka Jiří , Šebek František
Published: July 2013

Selected ductile fracture criteria are introduced and applied to prediction of chevron crack initiation and development during forward extrusion of long shafts. We present the calibration of selected criteria for carbon steel, simulate the process of forward extrusion and compare the simulation results with real experiments realized in a cooperating industrial company.
Prediction of Rail Profile Wear with the Increase of Vehicle Speed
Authors: Lee Dong Hyong , Seo Jeong Won , Kwon Seok Jin , Choi Ha Young
Published: July 2013

A method to simulate rolling contact wear in a rail surface was developed using the finite elements method and numerical analysis. A two-dimensional finite elements model was used in order to reduce the calculation time and boundary conditions to prevent excessive deformation of a wheel and a rail were applied. A numerical analysis of rail wear at rolling contact was predicted using the Archards equation. In addition, the characteristics of rail wear with the increasing speed of vehicle were analyzed. Results show that there was not a large difference in the depths of wear on the rail head with increasing vehicle speed, but the wear on the rail gauge corner increased with increasing vehicle speed.
A New Catalytic Kinetic Method for the Determination of Trace Amounts Vanadium with Resonance Rayleigh Scattering Detection
Authors: Zhang Xin Hui , Hu Le Ning , Liang Ai Hui
Published: July 2013

A new catalytic kinetic method for the determination of vanadium (V) was proposed, based on the V (V) catalyze the slow reaction between KClO3and phenylgycollic acid (PA) in 0.6 mol/L H2SO4solution at 100 °C. The reduction product of ClO3-, Cl-, reacts with Ag+to form (AgCl)nnanoparticles. The nanoparticles exhibit a max resonance scattering spectral peak at 470 nm and a strongest fluorescence peak at 470 nm. The resonance scattering intensity at 470 nm is linear to the V concentration in the range of 2.0×10-9mol/L to 4.0×10-8mol/L. The influence factors on the catalytic resonance scattering determination of trace vanadium were examined. This catalytic resonance scattering spectral method has been applied to the analysis of vanadium in real samples, with satisfactory results.
Laboratory Test of Uniaxial Compressive Strength of Shanghai Frozen Soils under Freeze-Thaw Cycle
Authors: Hu Xiang Dong , Wang Jin Tai , Yu Xing Fu
Published: July 2013

The artificial ground freezing (AGF) is now widely employed in constructions with the expanding underground space exploitation in Shanghai. In order to avoid geological disasters which might appear in the AGF practice, it is urgently needed to do laboratory tests on the physical and mechanical characters of Shanghai soft soil under freezing and thawing action. This paper tests three kinds of soils from the location ofShanghai Metro line 4 constructions in different state, i.e. original state, freeze-thaw state and secondary freeze-thaw state, and obtains the changing rules of soil characters under secondary freeze-thaw action.
Numerical Study on the Influence of Hole Shape on Film Cooling Effectiveness
Authors: Dai Ping , Yu Nai Yun
Published: July 2013

Effects of hole shapes on film cooling effectiveness downstream of one row of film holes at the blade were investigated using a three-dimensional finite volume method and multi-block technique. The present study also received velocity vectors about different hole shapes. The hole geometries studied include standard cylindrical hole and forward diffused shaped hole and converging slot-hole. It was found that the film cooling effectiveness of cylindrical holes obviously declined along with increasing the blowing ratio. Results of the shaped holes configuration present a marked improvement, with a high effectiveness at the lateral area between adjacent holes and effectiveness of the converging slot-hole was superior to other holes in various blowing ratios. The film cooling effectiveness realized by the slot-holes compared to the cylindrical and forward diffused shaped holes was more excelled at downstream of the intersection of the two slot-holes. The converging slot-hole and forward diffused shaped hole can reduce the vortex intensity, and then enhance the film cooling effectiveness.
Fluorescence Spectral Study of Berberine-K2HgI4 Associated Particle System and its Analytical Application
Authors: Tang Ya Fang , Wang Li Sheng , Liang Ai Hui
Published: July 2013

In 0.08 mol/L HCl medium, berberine (BB) cationic ion and HgI42-combine to BB-HgI4association complex molecule. These complex molecules self-aggregate to (BB-HgI4)nassociation particles. It exhibits two fluorescence peaks at 400 nm and 470 nm. A new and sensitive fluorescence method has been proposed for the determination of trace amounts of BB in the range of 10 to 800 ng/mL. The detection limit is 3 ng/mL BB. The method has been applied to the determination of trace berberine in real samples, with satisfactory results. The cause of the fluorescence was also discussed.
Stress Analysis of the Biomass Molding Mould Based on ANSYS
Authors: Meng Jian Feng , Feng Bai Tao , Dong Yu Ping
Published: July 2013

Biomass is a renewable energy. Its curing and molding technology is one of the key technologies and mould structure parameter is a important factor. A model is set based on ANSYS to simulate the molding, then the equivalent stress field and frictional force distribution of mould are founded. Finally, the relationship between maximum equivalent stress and mould parameter is studied.
Numerical Analysis of the Influence of Piles on Separated Island Platform Subway Station
Authors: Zhou Yao , Meng Dan , Wang Yuan Feng
Published: July 2013

The effect of bridge piles on separated island platform subway station performance was studied by performing two-dimensional numerical analysis. It turned out that the stress of subway station under piles tended to be larger than that without piles no matter under static analysis, dynamic analysis, or superposition of both analyses. Therefore, its necessary to consider the influence of piles on this kind of subway station in seismic analysis and, moreover, strengthen the stress concentrated areas.
Synthesis and Gas Sensing Properties of Palladium Doped Titanium Dioxide Nanoparticles
Authors: Li Fen , Li Qian , Ma Xiao Pin , Huang Yan Yan , Jing Zhi Hong
Published: July 2013

Pd doped TiO2 nanoparticles were synthesized by sol-gel method with tetrabutyl titanate and palladium chloride as precursor materials. The products were characterized by XRD, SEM, FTIR and ICPOES technologies. The gas sensing properties of the products to 2-chloroethanol vapor were investigated. The results showed that the optimum concentration of Pd in the TiO2 nanoparticles was 3 mol% when the particle size of the anatase TiO2 nanoparticles was about 7 nm. Compared with pure TiO2 nanoparticles, the 3mol% Pd doped TiO2 nanoparticles exhibited higher gas sensing activities to 2-chloroethanol vapor.
Research on the Maximum Riveting Force Based on Theory of Compression Instability
Authors: Yin Jun Qing , Wang Zhong Qi , Kang Yong Gang , Hu Yu Long
Published: July 2013

The riveting joint is the main connection to fasten two thin-walled sheet-metal parts in aircraft assembly. As one of important parameters in riveting process, the riveting force is mostly determined by the experience and experiments in actual production, lack of theoretical basis supported. This paper researched the maximum allowed value of riveting force in the elastic deformation stage of riveting process. Based on the theory of compression instability, the mathematics model of relationship among rivets diameter, rivet holes diameter and maximum riveting force was built. Then, by using the software for finite element analysis-ABAQUS, the instance of riveting process simulation was made. Finally, the result of instances simulation was compared with the mathematics model. The comparison shows that the mathematics model based on the theory of compression instability is effective and correct.
A Spline Based Method for Lateral Displacement and Ultrasound Strain Estimation
Authors: Zhang Cong Yao , Guo De Quan , Liu Dong C.
Published: July 2013

Ultrasound elastography is a technique of imaging information about tissue elastic moduli, which plays an important role in early diagnosis of several kinds of tumor. Usually, elastograms display only axial displacement and corresponding tissue strain. In lateral direction, however, there is no phase information and the precision of data is lacking too. In this paper, a spline based method for lateral displacement and the corresponding strain estimation is proposed. SSE, which is computed based on lateral data lines in pre-and post-ultrasound signal, was used as a pattern-matching function to estimate lateral displacement. With this method, we can obtain directly continuous estimates with lower computational cost. The SNRe and CNRe of elastograms have been evaluated using simulated data.
Preparation and Characterization of NTC NiMn2O4-La1-xCaxMnO3 (0≤x≤0.3) Composite Ceramics
Authors: Zhang Hui Min , Guan Fang , Chang Ai Min , Zhao Li Jun
Published: July 2013

Composite ceramics made of spinel structure NiMn2O4 and CaO-doped perovskite structure LaMnO3 were prepared by a conventional solid state reaction and sintered at different temperatures. The XRD patterns have shown that the major phases presented in the sintered samples are NiMn2O4 compounds with the spinel structure, La1-xCaxMnO3 with the perovskite structure and NiO with a monoclinic structure. SEM images show that the density and grain size of the composite ceramics increases with sintered temperature increasing. The electrical resistivity of the composite ceramics at 25°C is found to change significantly depending on the CaO content, while the thermal constant B is still reasonably large in the range of 2400 to 3000 K. For the composition x = 0.1, the composite with a low electrical resistivity (ρ25°C=4.46Ω·cm) and moderate B value (B25/50=2762K) was obtained. These composites could be applied as potential candidates for NTC thermistors in the suppression of the inrush current.
Synthesis and Characterization of Highly Dispersed Au-Pd Alloy Nanoparticles Supported on ZrO2
Authors: Cui Wen Jing , Ao Wu Lan , Zhang Yu Lin , Bao Zhao Ri Ge Tu
Published: July 2013

This paper investigated Au-Pd/ZrO2alloy catalyst prepared by solution reduction method using NaBH4as reducing agent and L-lysine as protection agent. TEM, EDX, XRD, UV-Vis and XPS were employed to investigate the morphology, composition, dispersity and catalytic properties of the catalyst. The results show that Au-Pd/ZrO2alloy catalyst is uniform and highly dispersed. Furthermore, this preparation method leads to highly active Au-Pd/ZrO2alloy catalyst for the selective oxidation of benzyl alcohol.
Preparation of Titanium-Oxide-Coated Polypropylene Granules for Photooxidation of Organic Pollutant
Authors: Shin H.S. , Rhee D.S.
Published: July 2013

Titanium dioxide was coated onto buoyant polypropylene granules. Titanium dioxide coated polypropylene granules (TCPG) had high mechanical and attritional stability as well as appreciable photocatalytic activity under solar irradiation. Chosen model pollutant, Methylene Blue (MB) could be totally decolorized and partially mineralized within 3 h of treatment. TCPG might successfully be applied as suspended in the column flow-through system. Degradation rates depended strongly on pH, initial dye concentration, and optimal media dosage, following pseudo-first-order kinetic model.
Carrier Lifetime of Platinum Doped P-N Diode after Irradiation by Soft X-Ray
Authors: Nararug Budsara , Srithanachai Itsara , Ueamanapong Surada , Khunkhao Sanya , Janprapha Supakorn , Thongnak Thanawat , Atiwongsangthong Narin , Niemcharoen Surasak
Published: July 2013

This paper analyzes the effect of X-ray irradiation on the electrical properties of Pt-doped p-n diode. X-ray energy irradiated on Pt-doped P-N diode with 70 keV with time 205 sec. After irradiations, the current-voltage (I-V) characteristics and capacitance-voltage (C-V) characteristics and carrier degeneration lifetime (τg) were investigated. The results show that the leakage current is slightly increased after the diodes were exposed X-ray and affect higher degeneration carrier lifetime. The effects after X-ray irradiation indicated that the defects of the diode have been changed.
The Effect of X-Ray Irradiation on the Electrical Properties of Pt-Doped P-N Diode
Authors: Janprapha Supakorn , Srithanachai Itsara , Ueamanapong Surada , Khunkhao Sunya , Thongnak Thanawat , Klinsanit Sani , Niemcharoen Surasak
Published: July 2013

This paper presents the effect of X-ray irradiation on the electrical properties of Pt-doped P-N diode with X-ray energy 70 keV for 205 seconds. The results show that the radiation affected both reverse and forward current characteristics of P-N diode. The forward current is increased about 3 orders after radiation, while the leakage current is increased slightly after irradiation. Moreover, build-in voltage value is also changed after irradiation. The cause of parameters changing can be analyzed from carrier lifetime and series resistance. It can be seen clearly that X-ray irradiation technique are significant and can be used to improving electronic devices.
The Effect of the Central Metal Atom on the Structural Phase Transition of Indium Doped Metal Phthalocyanine
Authors: Rojanasuwan Sunit , Prajuabwan Pakorn , Chanhom Annop , Jaruvanawat Anuchit , Rangkasikorn Adirek , Nukeaw Jiti
Published: July 2013

We investigate the effect of central metal atom on the phthalocyanine (Pc) molecular crystals as intercalated with indium. As dopant, indium has physical interaction with some atom in the ring of Pc molecule and there is charge transfer between indium atom and Pc ring atom. Since In-doped Pc is a hole doping which increase positive charge carriers and the HOMO of ZnPc, CuPc, NiPc and MgPc are localized on the phthalocyanine ring, then, the central metal atom e.g. Zn, Cu, Ni and Mg are not directly involved with the charge transfer between indium dopant and their Pc molecule. The structural phase transition from α phase to β phase of ZnPc upon doping with indium is another evidence for the existing of charge transfer between dopant atom and matrix Pc molecule. A comparative experiment of optical absorption spectrum of each metal Pc reveals that the central metal atom will affect the forming of crystal structure whether will be α phase or β phase as intercalated with indium.
Guided Modes of Positive and Negative Group Index in the Honeycomb Photonic Crystal Waveguides
Authors: Amorntep W. , Wanchai P.
Published: July 2013

A guided mode of positive and negative group index structure is essential to quantum optics for design and development of high efficiency optical devices which are useful to security optical communication system and to diverse applications such as Optical Time-Division-Multiplexing, Optical Switch, Laser, LED, Entangled Photon Source and Single Photon Source. Thus, we proposed to develop an efficient photon emission along line defect of two-dimensional honeycomb photonic crystal waveguide in the silicon slab. The honeycomb lattice of circular air holes on a silicon plate is simulated to obtain two nearest guided modes between positive and negative group index regimes. This significant property shows the potential applied guided modes of photonic crystal waveguide enhancing spontaneous emission for controlling photon emission between two resonance frequencies. Significantly, this work is oriented to produce the novel optical devices for control photon emission in the optical communication system. In addition to the honeycomb lattice, it can easily be made on a Si on insulator (SOI) wafer.