bluuebunny/crossref_metadata_2025 huggingface dataset:
Autocatalytic Photo-Oxidation Process of C3-C4 Fraction to Methanol
Authors: Loriya Mariya G. , Ijagbuji Ayodeji A. , Tselishtev Alexei B. , Zakharov Ivan I.
Published: March 2013

The direct conversion of propane and butane fraction (existing as mixtures rather than separate products) to methanol as well as the reaction mechanism under visible light source (λ=420 nm) and the catalytic action of •NO2 have been evaluated. The purpose of this work is to explore novel pathways for the production of methanol by suggesting a simplified model and result-oriented scheme to avoid the drawbacks associated with methane activation (incredibly high activation energy of about 440 kJ/mol even under mild processing conditions) in the course of its transformation to methanol which is characterized by high yield and selectivity. It is important to consider propane and butane fraction (recovered from primary crude oil distillation and by cracking of heavy molecules) as a possible feedstock for methanol production exhibiting a sufficiently high degree of conversion per pass. Thereby, a relatively simple and economical method for methanol production from refined crude oil composed of propane and butane (a one step co-processing) have been tendered.
Abrasive Wear: Design of Experiment (DOE) for Determining the Wear on Crowns Used by Drilling Companies for Mineral Surveys
Authors: da Silva Santos Zirlene Alves , Mendes Jefferson Januário , da Costa Adilson Rodrigues
Published: March 2013

Currently companies seek performance improvement for equipment and components, and an important factor that influences performance is wear. The objective of this study was to demonstrate the applicability of a methodology that was developed using literature, field research, brainstorming, optical microscopy, statistical analysis.Wear tests for drilling crown samplesfor the production process were performed. - The crown’s chemical composition was analyzed to see if it was appropriate for the soil’s mineral lithology. Having done this, a statistical analysis was made. using Minitab 16 software, specifically applying DOE (2Kfactorial) technique. With the statistical result, a prototype was produced and subjected to a wear test for analysis of material loss compared to crowns having a better performance.Thus, the conclusion reached was that the planning process improves withthis experimental probing, which helps to identify and correct controllable factors.
Inherent Characteristic Analysis for Torsional Vibration of a Planetary Transmission
Authors: Yang Yang , Fu Yan Xiao , Cui Liang Yi , Xu Xiang Yang
Published: March 2013

A torsional vibration mechanical model of the transmission system of a certain cetarpillar vehicle is established using mass distribution method. The torsional vibration model, containing multi-stage simple and compound planetary gear transmissions, fixed-axis transmission and power split/converge system, is established based on Lagrange Equation. Matlab is used for presenting and writing the according program of the modal analysis of free torsional vibration. The study is focused on the torsional vibration characteristic of the system on one specific working condition and the similarity in the inherent characteristics of the system on different working conditions.
Stability Analysis of Inhaul Cable on Cable-Stayed Awning with Steel Structure Considering the Wind-Rain-Induced Vibration Effect
Authors: Zhao Xiao , Wang Qing Yuan , Liu Yong Jie
Published: March 2013

Due to the applicable installation overhang large span, small mass, flexible characteristic, and small damp, the cable-stayed steel structure awning (CSSSA) could easily result in vibration with the wind load. The main factor is the turbulence wind and wind-rain induced vibration. Combining the structural dynamic theory, and considering the characteristic of the CSSSA, a motion differential equation is set up considering the wind-rain induced vibration, analysis cable-stayed stability under wind-rain induced vibration effect, and compare with the existing engineering result. Hope to provide some reference for similar designs.
Interaction between the Dislocations and Precipitates in Fe-40Ni Alloy during Stress Relaxation
Authors: Zhang Xiao Juan , Yuan Shao Qiang
Published: March 2013

Transmission electron microscopy (TEM) was used to study the interaction between the dislocations and strain induced precipitates during relaxation process after deformation in Fe-40Ni alloy. The experimental results demonstrate that the dislocation density is very high and distribute randomly before relaxation. As the relaxation time increasing, dislocation walls will form gradually by polygonization. The strain induced precipitates retards their progress. In the final relaxation stage, most dislocations get rid of pinning of precipitates and the dislocation walls have developed into subgrains with large size.
Optimization of Formulation of 5% Toltrazuril Suspension Concentrate and Enhancement of its Bioavailability in Material Engineering
Authors: Hao Zhi Hui , Xiao Ke Feng , Wang Lei Lei
Published: March 2013

Suitable additives for preparing 5% toltrazuril suspension concentrate are screened. And optimal formulation of 5% toltrazuril suspension concentrate was determined as follow: the proportion of toltrazuril is 5%, Xanthan gum 0.3%, 1,2-Propanediol 10.0%, Citric acid 0.6% and the remainder is water. The pH value of that is 7.0. Thereby, the bioavailability of toltrazuril is improved.
Mix Proportion Design and Material Requirements of Road Recycled Aggregate Concrete
Authors: Deng Feng Xiang , Li Sheng
Published: March 2013

When the recycled aggregate is crushed, many micro-cracks can be observed and some grout can remain on it. The aggregate therefore severely absorbs water when it is later mixed with concrete. The impact of water-binder ratio on strength becomes different from that of the ordinary concrete, and the ratio can no longer be used to evaluate the strength accurately. To solve this problem, this paper describes the mix proportion design method of recycled aggregate concrete, including the requirement of mix proportion design, the calculation for mixing proportion parameters and the technical requirements of recycled aggregate, natural aggregate, fly ash and admixtures. The manufacture of specimens is also described. This work provides guidance for the proper design of mix proportion of recycled aggregate concrete.
Preparation of the Gold Nanoparticles and its Activity for Single-Step Amination of Benzene to Aniline
Authors: Chen Gang , Yang Chun Hua
Published: March 2013

Gold nanoparticles (AuNPs) were attached to the surface of alumina particles by an in-situ immobilizing method. SEM and XPS analysis showed that the coverage of alumina particles by AuNPs increased as the amount of alumina decreased; AuNPs onto alumina particles by the conventional colloidal deposition method were also prepared, whose TEM showed that the coverage of AuNPs was evidently smaller than that in the case of modified colloidal deposition method，although the AuNPs were spread almost uniformly over the surface of alumina particles. Au-immobilized alumina particles were subsequently utilized as the catalysts for direct amination of benzene with NH3H2O as an aminating agent and H2O2 as an oxidant under mild conditions. The reaction conditions were optimized: when catalyst amount was 2.0 g, reaction temperature was 50 °C, NH3H2O amount was 60 mL, H2O2 amount was 30 mL, and reaction time is 2 h, Au-immobilized alumina particles showed the highest aniline yield (1.96 mg) for 25 mL benzene.
First-Principles Study on Electronic Structure and Magnetic Properties of Freestanding Ni Nanobelts
Authors: Chen Guo Xiang , Wang Dou Dou
Published: March 2013

Calculations have been performed for the relaxed structures and electronic properties of Ni nanobelts with the cross-section 3×3, 3×5, 3×7 and 3×9 atomic layers, using the first-principles projector-augmented wave (PAW) potential within density functional theory (DFT) framework. For all of the four size Ni nanobelts, the most atoms relax inward and the magnetic moment decrease as the belt width increase. Compared with bulk Ni, the freestanding Ni nanobelt offer strong spin polarization at the Fermi level as well as considerable magnetic moment. Thus such structures can be potentially utilized to design magnetic nano-devices.
Investigation on the Frequencies of Radial Breathing Mode and Radial Breathing-Like Mode of Carbon Nanotubes
Authors: Lu Chuan , Zhang Hua
Published: March 2013

Carbon nanotubes (CNTs), one of the important symbol to enter the era of nanotechnology, becomes the most attractive materials with the unique properties, and CNTs shows extensive potential application in drug molecular transmission, CNTs tip and CNTs-based sensors. However, the application of nano-device requires more accurate research about geometric, electronic and mechanical properties which matches to radial breathing vibrational mode in Raman spectroscopy experiment. The shapes and frequencies of radial breathing mode(RBM) and radial breathing-like mode(RBM-like) were investigated by the modified beam element model based on molecular mechanics, and the relationship of frequencies of zigzag and armchair CNTs with length - diameter aspect ratio, diameter and chirality were also discussed respectively. The results show that there are RBM and RBM-like in radial vibration of CNTs, and their frequencies are approximate.
Study on the Composite Spinning Co-Extrusion Process of the Tri-Component
Authors: Wang Lei , Chen Huai , Liu Ting Ting , Ji Jun Yang , Gan Xue Hui
Published: March 2013

In the molding process of the tri-component composite spinning, the flow control of each component plays a significant impact on extrusion swell. This paper simulates the extrusion swell of the tri-component fiber in different flow ratio of different components based on Polyflow fluid dynamics simulation software, and measures the extrusion swell ratio of the tri-component fiber in different flow ratio of different components through the experiment. Simulation and experimental results show that by adjusting the melt flow ratio of the various components, we can obtain the desired extrusion swell ratio, which can improve the performance of the tri-component fiber.
Influence of Ageing on Surface Quality of Machined Nanostructures
Authors: Hu Xing Lei , Sun Ya Zhou , Liang Ying Chun , Chen Jia Xuan
Published: March 2013

A three-dimensional model of Monte Carlo (MC) simulation is proposed to study the effects of ageing on the surface quality of machined nanostructures. The model includes the utilization of the Morse potential function to simulate the interatomic force between the atoms in workpieces. The results show that the ageing processes have important influence on the surface morphology and internal structure of machined workpiece. Most of the disordered point defects and one large stacking fault structures in machined workpiece disappear after ageing, but still some defect structures remain. In addition, distribution of atomic potential and atomic stress in the workpiece become regular in the aging process, and the atoms of the defect structures have much higher potential energy and stress. Finally, surface roughness of machined workpiece definitely increases after ageing. To analyze the morphology of machined surface after ageing is very practical and meaningful.
Study on SF Nanofibrous Mats via Electrospun with Different Spinning Solvent as TFA/DCM and FA
Authors: Guo Sha Sha , Jin Xiang Yu , Ke Qin Fei , Cao Yun Qian
Published: March 2013

Silk fibroin (SF) was regenerated for electrospinning. A mixture solvents Trifluoracetic acid (TFA) and dichloromethane (DCM) was selected as the solvent of regenerated SF. Its spinning properties and characteristics of end nanofibers mats were compared with those of the regenerated SF electrospinning solution dissolved in formic acid (FA). From the comparison of SEM images of regenerated SF electrospinning from the two different solvents solutions, it could be found that the spinning concentration range in TFA&DCM was smaller than that in FA for the solution viscosity was bigger than that in FA. Moreover, from the FTIR spectra of electrospun nanofibers obtained from TFA&DCM and FA was both similar with that of regenerated SF. This meant that there was no new group formed when TFA& DCM was selected as solvents. Therefore, TFA&DCM were also a nice option for the electrospinning of regenerated SF.
Effects of DTAB on Performance of Nano Pd/C Catalyst for Purification of Terephthalic Acid
Authors: Xiao Fa Xin , Li Yan Song , Xu Xin Yang , Shen Xiao Ni , Ren Yong Peng , Zhang Xiang Jun
Published: March 2013

The 0.5 wt.% Pd/C catalysts used for purification of terephthalic acid(TA) were prepared, and the effects of dodecyltrimethylammonium bromide(DTAB) concentration on activity and microstructure of catalysts were investigated by means of SEM, TEM, XRD,HPLC,specific surface area(BET) and porosity test. The results show that DTAB can increase the activity of Pd/C catalysts, and the catalytic activity increases with the increase in DTAB concentration and nearly remains constant with further increase after it exceeds 0.5 wt.%.. DTAB can clean the surface of activated carbon and diminish the palladium size of Pd/C catalysts. The addition of DTAB has effects in crystal structure of nano Pd/C catalysts, and the Pd crystal planes of (111) and (200) was replaced by a broad reflections after DTAB added. DTAB tends to form various meta-stable structures(spherical or cylindrical)at the solid-liquid interface that helps finer grain for mation and hinders subsequent coarsening of the palladium particles.
Investigation on Viscosity of Carbon Nanofibers Reinforced Epoxy
Authors: Chen Xing Kai , Jiang Bing Yan , Zhou Zhou
Published: March 2013

Carbon nano fibers reinforced polymers have good mechanical properties but are difficult to process. In order to find out the influences of carbon nano fibers (CNF) on processing performance of epoxy resin, a series of tests on viscosity were carried out, including the influence of CNF weight fraction, CNF oxidation and temperature change. Infrared spectrum was used to detect the functional groups in CNF. The mechanism of CNF influence on viscosity of CNF reinforced epoxy resin has been discussed. The experimental results indicate that the weight fraction and oxidation of CNF enhanced viscosity of epoxy and the temperature have an inverse relationship with viscosity.
Preparation and Optimization of a Live Newcastle Disease Virus Vaccine Encapsulated in Chitosan Nanoparticles
Authors: Hao Yan , Wu Hao , Li Wei , Luo Xiao Mei , Zhao Kai
Published: March 2013

In this study, the researcher’s interest is focused on establishing a model with La Sota live vaccine immobilized into chitosan, which was prepared using a ionic gelation method. The formulation, preparation procedure, influence factors, physicochemical characteristics were evaluated. The results of study demonstrate that the NDV-CS-NPs have been produced with suitable size, morphous regulation, extremely spherical shape, regular and well-distributed. The NDV-CS-NPs produced by the optimal formulation were average size (371.1nm) and proper zata potential (+2.84 mV). The entrapment efficiency was (74±3.7) %. It can provide a new useful information for the development and evaluation of synthetic vaccines.
Preparation of Nano Pd/C Catalyst for Purification of Terephthalic Acid by Sol-Gel Method
Authors: Xiao Fa Xin , Li Yan Song , Xu Xin Yang , Ren Yong Peng , Shen Xiao Ni
Published: March 2013

The traditional method of preparing 0.5 wt.% nano Pd/C catalysts used for pure terephthalic acid(PTA) refining is the precipitate-reduction method, and this paper proposed the sol-gel method, in which the palladium colloid was firstly prepared, and followed by the load process onto the activated carbon. The activity and microstructure of catalysts were investigated by means of SEM, TEM, EDS，XRD and HPLC. It was found that the activity of catalyst with the sol-gel method was much higher than that with precipitate-reduction method. The preparation technology has less effects on the micostructure of Pd/C catalysts, while the palladium particles of catalyst obtained with sol-gel method are much finer and the relatively palladium content is much higher.These two factors contribute to the higher activity of Pd/C catalyst.
Deposition and Properties of Hydrogenated Microcrystalline Silicon (μc-Si:H) Films for Solar Cells
Authors: Li Yan Long , Zhang Zhong Lin , Gang Hong , Qiu Peng
Published: March 2013

Radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) technique is widely used in preparing uniform and large area a-Si:H films for various photoelectric devices. However, in the deposition processes of PECVD, the plasma bombardment to the deposited films will result in hindering the processes of crystallization. In the processes of hot-wire chemical vapor deposition (HWCVD), high-crystallinity films with a quickly growth rate can be obtained. In this article, hydrogenated microcrystalline silicon (μc-Si:H) films on glass substrate were prepared by a combination technique of HWCVD and RF inductively coupled plasma (ICP) at a low pressure (7Pa). The deposition parameters including the distance between the glass substrate with the hot wire and the flow ratio of SiH4/H2 in order to optimize the properties of μc-Si:H films. The crystallinity, microstructure, electrical and optical properties of the μc-Si:H films were investigated by Raman Spectroscopy, X-ray diffraction analysis (XRD), and UV-visible spectrometer, respectively. The results indicate that the crystallinity of the μc-Si:H films can be controlled at a very wide range and the deposition rate is up to 3nm/s. The deposited films show excellence electrical and optical properties.
Large Pore Nanocrystalline TiO2 Films for Quasi-Solid State Dye-Sensitized Solar Cells
Authors: Gao Jian , Li Hao Ran , Rong Hua , Dai Yu Hua
Published: March 2013

Photoelectrodes of mixed polymethylmethacrylate (PMMA) and TiO2paste with different ratios were fabricated and studied for improved photovoltaic conversion efficiency in quasi-solid state dye-sensitized solar cells(QS-DSCs). The large pore nanocrystalline TiO2films were prepared by the doctor blade method and charicterized by SEM and UV-Vis spectroscopy. SEM images show that large pores have been formed in the TiO2films. The transmittance of the films increased with an increase amount of PMMA, while the light-absorption decreased when the films covered by dyes. I-V curves show that a relatively high photovoltaic conversion efficiency of 2.1%~2.26% was achieved when the PMMA/ TiO2paste weight ratio was in the range of 1:25~1:35 under AM 1.5 illumination at 100mW/cm2.
Characterization, Intestinal Absorption and Pharmacokinetics of Long-Circulating Nanoparticles Loaded with Panaxnotoginseng saponins
Authors: Zhao Guo Wei , Chen Xu Long , Liang Xin Li , Liao Zheng Gen , Wang Chun Liu , Cao Yun Cao , Zhao Li Jun
Published: March 2013

The aim of the present study was to increase bioavailability after oral administration. In this study, Panaxnotoginseng saponins (PNS) was entrapped within the long-circulating nanoparticles (LCNs) by the multiple emulsion method. The PNS-LCNs were characterized in terms of size, zeta potential, morphology, thermal properties, drug entrapment efﬁciency (EE), and in vitro release of the PNS. In addition, the intestinal absorption of PNS-LCNs in vitro was investigated. The pharmacokinetics of PNS-LCNs following oral administration was determined over 72 h in male rats. It was found that the mean particle size and zeta potential of the PNS-LCNs were 147±4.5nm and −44.7±1.5mV, respectively, and the entrapment efﬁciency (EE) was 53.93%±0.69%. differential scanning calorimetry (DSC) indicated that PNS has different states in PNS-LCNs and original PNS. The release pattern of the PNS-LCNs followed the Weibull model. The release parameters (T50, TD) were observed to be higher for PNS-LCNs compared with original PNS (p< 0.01) in vitro release. The intestinal absorption study indicated that the intestinal permeability coefficient (Papp) of PNS-LCNs was higher than original PNS’s. The pharmacokinetics of PNS-LCNs was studied after oral administration to male rats, PNS-LCNs provided greater area under the concentration-time curve (AUC), higher plasma concentration (Cmax), longer mean residence time (MRT) and median time to maximum drug concentration (Tmax). LCNs could be used for improving permeability and increased bioavailability after oral administration of PNS.
Analytical Solution of Mushy Zone under Directional Solidification
Authors: Li Xiang Ming , Wang Zi Dong
Published: March 2013

Based on the general mathematical formulation under unidirectional solidification with mushy layer developed in Ref.[13], leading approximation of solution in mushy layer is obtained for the case that the inverse Lewis number is small parameter. For the steady state of solidification, concentration field in the mushy region is given as function of a solid volume fraction. Mushy layer width and solid volume fraction at the solid-mush interface are obtained. Effects of temperature gradient on mushy layer width and solid volume fraction at solid-mush interface are presented.
Characterization of Interfacial Layer of DUV Coatings by Spectroscopic Ellipsometry
Authors: Deng Wen Yuan
Published: March 2013

The Interfacial layer has an important influence on the optical performance of the deep ultraviolet (DUV) coatings. The variable angle Spectroscopic ellipsometry measurements of three kinds of DUV coating samples were performed in the wavelength range 150-500nm using a purged variable angle Spectroscopic ellipsometer. The samples include the single layer sample, double layers sample, and three layers sample. The thickness and optical index of the MgF2 layer and LaF3 layer as well as those of the interfacial layer between them were obtained by successful regression of the SE measurements. For the single layer, the agreement of the results between the SE and the spectrophotometic techniques was very good. The obtained thickness of the two kinds of interfacial layer was in consistent with the RMS results of the single layer obtained by AFM, indicating the obtained results were reliable.
Preparation and Tribological Performace of the Complex of β- Cyclodextrin and RC2540 Dialkyl Pentasulfide
Authors: Guan Ji Ju , Huang Yi Shen , Xu Xue Feng , Peng Wei
Published: March 2013

The complex of β-cyclodextrin (β-CD) and RC2540 dialkyl pentasulfide was synthesized and characterised by means of fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TG) and scanning electron microscope (SEM). Then the friction and wear behavior of RC2540, β-CD and complex were studied by four-ball test using the mixture of PEG-600 and water as base fluid, and finally the lubrication mechanism of β-CD and the complex were analyzed using energy-dispersive X-ray spectroscopy (EDS). The experimental results revealed that the complex had formed well and had better antifriction and anti-wear property than β-CD. RC2540 in complex was released and the extreme pressure film was formed on the friction interface in the friction process. The β-CD molecules in complex were cracked into fragments, and the fragments with hydroxyl also formed lubricating film and fragments with no hydroxyl were mainly carbonized. The lubricating film of the complex had a better tribological performace due to the cooperation of the lubricating film of β-CD and extreme pressure film of RC2540.
Study on Subcritical Water Extraction of Flavonoids from Scutellaria baicalenses
Authors: Cheng Yan , Liu Jing , Liu Chang An
Published: March 2013

The extraction of baicalin, baicalein, wogonin and wogonoside from Scutellaria Baicalenses was performed using subcritical water. The effects of key operation conditions by varying the temperature (110-160 °C), extraction time (10-90 min), water loadings (2.0-4.0 mL)and particle sizes (>20- <100 mesh) were evaluated. The highest extraction yields of baicalin and wogonoside were obtained at extraction temperature of 160 °C, extraction time of 60 min, water loadings of 4.0 mL and 60-100 mesh. The highest extraction yields of baicalein and wogonin were obtained at extraction temperature of 110 °C, extraction time of 10 min, water loadings of 4.0 mL and 60-100 mesh. The subcritical water extraction was compared with the conventional extraction method. The total extraction yield by SCWE was higher than those obtained using ethanol as the solvent.
Experimental Study on High-Speed WEDM Finishing in Gas Based on Central Composite Design
Authors: Wang Tong , Lu Yu Mei , Wang Chao Qun , Jiang Kun , Xie Fei , Ding Xiang Wei
Published: March 2013

Using cutting speed and the roughness as index, the five factors as pulse duration, peak current, offset, ratio of pulse interval to pulse duration and worktable feed were chosen in dry finishing. Based on the single factor experiment, the central composite design (CCD) method is used to study the effects of the five factors and their interactions on cutting speed and the surface roughness and develop empirical models for cutting speed and roughness Ra. Significant order influencing cutting speed and roughness are found. The results of the verification test show that Ra regression model and cutting speed regression model have high reliability, and can achieve significant prediction effect.
Properties Research and Mechanism Analysis of Polypropylene Fiber Reinforced FGD Gypsum Composites
Authors: Pan Hong , Li Guo Zhong
Published: March 2013

Polypropylene fiber, stearic acid-polyvinyl alcohol emulsion and FGD gypsum were chosen to prepare fiber reinforced FGD gypsum composites by a certain process. The effects of polypropylene fiber and stearic acid-polyvinyl alcohol emulsion on the composites were observed, and their action mechanisms were also analyzed with physical molds of waterproofing mechanism established. QUANTA FEG 250 scanning electron microscope was used to observe the microcosmic morphology of the samples. The investigations indicated that the mechanical property of fiber reinforced FGD gypsum composites was enhanced by admixture with polypropylene fiber while the water-resistant property was improved by adding the organic emulsion which could make the strength loss induced.
Extraction and Purification of Tea Polyphenols and EGCG
Authors: Gao Yan Hua , Chen Ying , Wang Zhen Xi
Published: March 2013

The extraction and purification of tea polyphenols(TP) and EGCG from green tea extraction by nano-membrane filtration, resins absorption and column chromatographic exctration(CCE) were studied. The results indicated that the concentrations of TP and EGCG respectively increased to 35.21% and 13.56% after separated by the hollow fiber membrane with the molecular of 1.0×104. And then, after the absorption of polyamide resins, the concentrations further increased to 95.51% and 52.56%. Finally, the product with the EGCG concentration of 98% was obtained by silica gel CCE method.
Research on Friction and Wear Properties of MC Nylon/ Carbon Nanotubes Composites
Authors: Ge Tie Jun , Wang Jing , He Wei
Published: March 2013

In this article, MC nylon/carbon nano tubes (CNTs) composites were prepared by in-situ polymerization method. The friction and wear properties were determined. The sample wear surface morphology carried out by scanning electron microscope (SEM) and the wear mechanism was investigated. It was found that the friction coefficient of composites has decreased with the amount of CNTs increasing in the composites. Addition amount of CNTs is up to 0.3% (weight percent), abrasion index decreased to minimum. The abrasion index of the sample of wearing a long time is smaller than that of the sample of wearing a short time. The sample with wearing less time mainly take place adhesive wear, however, mainly happen abrasive wear and adhesive wear for wearing time is longer. Further more, carbon nano tubes (CNTs) are not only improve the wear resistance of composites but also improve the mechanics performance.
Influence of Admixture on the Properties of Magnesium Oxychloride Cement
Authors: Jin Yu Jie , Xiao Li Guang , Luo Feng
Published: March 2013

The influence of phosphoric acid and iron vitriol on the properties of magnesium oxychloride cement is studied in this paper. The experiment indicated that phosphoric acid and iron vitriol can improve the water-repellency of magnesium oxychloride cement. The softening coefficient is about 1.014 when the dosage of phosphoric acid is 1% and the softening coefficient is about 0.77 when the dosage of iron vitriol is 4%.
Properties of Al Films Depend on Substrate Temperature by DC Magnetron Sputter Deposition
Authors: Shen Yi , Yao Ruo He
Published: March 2013

Al films were prepared by DC magnetron sputter deposition at different substrate temperatures. The sheet resistance of the films was measured by four point probe sheet resistance meter, and the film thickness, which was obtained by surface profiling system. The surface and cross-section morphology of the films was observed by AFM and FESEM. As a result, the resistivity of the films decreases obviously as the substrate temperature increases gradually. The higher substrate temperature is, the rougher the films surface is and the larger the grain size is.
Experiment of Different Admixtures on Antifreeze of Vegetation-Growing
Authors: Hu Huan , Zhou Ming Tao , Yang Ping , Xu Wen Nian
Published: March 2013

Referring to the method of antifreeze on concrete, the experimentation analyses the antifreeze effect of vegetation-growing concrete caused by palm fiber, silicon powder and surfactant through the evaluation of the vibration frequency and mass changes in the process of freeze - thaw cycles. The results show that palm fiber and silicon powder can improve the antifreeze of vegetation-growing concrete effectively, while surfactant plays a negative role as its amount is above a certain value among the three kinds of admixtures, the palm fiber is the best admixture to improve the antifreeze of vegetation-growing concrete, and the optimal amount is about 1% of the planting raw soil by dry weight. In this case, the antifreeze of vegetation-growing concrete can be increased at least 50%.
Study and Implementation of Large-Diameter Fiber Termination Used in High Power Dental Treatment
Authors: Lin I En , Shiao K F
Published: March 2013

Large diameter (0.4~0.8mm) fiber termination is widely used in the gum related cares. However, cost-effective shaped fiber is not yet developed for high power (~5W) laser application. In this study, we have demonstrated the feasibility of using two stepping motors with a patented axial movement (0.005mm increments) method. The key parameters are investigated using finite element modeling. The results show that larger fiber diameter with less number of feeding increments can damage the fiber during polishing process.
The Mechanical Reliability of a Commercial MEMS Microphone
Authors: Fang Wen Xiao , Huang Qin Wen
Published: March 2013

This paper describes our recent work on the mechanical reliability of a commercial MEMS microphone by performing three mechanical tests, i.e. a constant acceleration test, a mechanical shock test, and a random vibration test, according to the standard of Mil-Std-883. We find that, the studied MEMS part of the microphone can survive a stress limit above 20000g. Two failure modes, i.e. the breaking of diaphragm and the backplate and the delamination of the electrode from the backplate are revealed in the three tests.
Finite Element Analysis of Free Expansion of Coronary Stent Based on ANSYS Workbench
Authors: Yu Wen Yan , Wang Jian Guo
Published: March 2013

Undertaking the 316L stainless steel as a medical stent material and the coronary stent structure as the research object, ANSYS Workbench12.0 is used to simulate the free expansion process of coronary stent by two expansion methods. Finite element analysis is used to solve such problems as deformation behaviour of the stent, mechanical behaviour as well as nonlinear problems of the stent and balloon interaction during the free expansion process. The simulation results show that the stent and balloon interaction process will appear slip phenomenon, the stent shortening in the axial direction and elongating in the radial direction, and that the arc supporting rod location of the stent is the main area of the maximum stress. These can provide a scientific reference for the next new stent design and optimization.
Monitoring System of CAN Bus Based on OPC Technology
Authors: Song Yu Qin , Li Chun Li
Published: March 2013

Through the comparison of many monitoring system’s schemes, the bus way of monitoring system was select which is based on CAN bus, using the PCI-5110 CAN interface card which is produced by ZHOU Li-gong company as the CAN node, selecting the CAN485MB intelligent protocol converters as their communication bridge between the CAN interface card and AI instrument. The system adopts the OPC technology to realize the communication between Kingview and CAN bus and builds a monitoring system based on CAN bus network to realize the function of the process control experiment platform of the real-time monitoring and graphical interface. Having friendly MMI, good flexibility, the whole system is worth to popularize and publicity.
Line to Plane Parallelism Error Evaluation of the New Generation GPS Based on DCWPSO
Authors: Wang Xu , Huang Mei Fa , Xiao Meng Meng
Published: March 2013

Currently Least Squares Method (LSM) is commonly applied in the error evaluation, but it is adaptive to the condition of low accuracy requirement. Besides, the error value obtained by LSM is not the minimum. In order to accurately evaluate parallelism error, the minimum zone mathematical model of the parallelism is given based on the new generation geometrical product specification and verifications (GPS). According to the characteristics of parallelism error evaluation, a new adaptive Particle Swarm Optimization algorithm with dynamical inertia weight (DCWPSO) is proposed to solve target optimization problems of the error evaluation. Finally we use the measurement of a line to plane parallelism error evaluation as an example to validate the proposed method. The experiment results show the feasibility and availability of the method．
Study of Free Length Detection for Bolster Spring of Railroad Tracks
Authors: Li Ming Jing , Wang Xiao Lin , Qiu Rong Sheng
Published: March 2013

This paper introduces the importance of the bolster spring in railroad traffic safety, and the present situation of detection about the free length of the bolster spring has been reviewed. For overcoming the shortcomings of the detection in accuracy and efficiency, a new method is proposed to detect and sort the free length of different specifications of bolster springs fast and high-precision,which based on laser scanning ranging principles and PC software programming. It will highly enhanced the detection precision and the accuracy of material selection.
TPMS Test Management System Based on Wireless Sensor Network
Authors: Wang Hong Fen
Published: March 2013

The new tire pressure monitoring system (TPMS) needs rigorous testing to ensure product reliability before it is put into use. But traditional means usually used real vehicle running tests, with more energy consumption, and for a wide-range test was difficult to make. To this end, in this paper, a new TPMS test management system was proposed, which was a good solution to the above problem. The scheme is based on the advanced ZigBee wireless network technology and the RS-485 bus technology to achieve a system of joint networking, the programmable software management system based on JSP and SQL Server 2005 database, made good and practical effect.
Convenient Calibration Procedure for Structured Light Projection System
Authors: Li Wen Guo , Duan Shao Jun
Published: March 2013

We present a convenient calibration method for structured light projection system. The proposed clibration approach can realize 3D shape measurement without projector calibration, without system calibration, without precise linear z stage to be used, the relative position between camera and projector can be arbitrary, and the only involved device is a plane board. Experiment results validated that the accuracy of the proposed approach.
Study of Liquid Single Particle Size Detection Based on Lateral Scattering Technique
Authors: Chen Feng , Du Yao Hua , Cheng Zhi , Xu Ke Xin , Wu Tai Hu
Published: March 2013

A new type detecting device was developed according to the demand of the liquid single particle size analysis. Based on side scatter detection technology, the device used a semiconductor laser as light source. By introduction of the hydrodynamics, sample particles were focused sequentially through the measuring beam. The lateral scattering lights were received by high-sensitivity avalanche photodiode. So the particles’ size can be achieved by analyzing the scattered light pulse signal magnitude. Experiment results showed that the device can detect 0.35μm particle effectively, and its particle size detection limit is superior to the existing liquid particle detection products in the market. In addition, the hydrodynamics focusing technology contributed to more prominently distinguish rate. The device has broad application prospects in the pharmaceutical, medical and polymer industries.
The Design and Implementation of Brushless DC Motor Control System
Authors: Zai Wen Jiao , Wang Hua Zhang
Published: March 2013

The paper designs a brushless direct current motor (BLDCM) control system, mainly including design of former stage driver circuit, H bridge drive circuit, sensor commutation control, Forward / reverse control. In order to increase the reliability of the system, improve the performance of motor running, one has a good choice of parameters about power amplifying circuit device. What is more, one adopts PID algorithm in the system. Experiments show that the operating speed is with wide speed range from 150 r/min to 4000r/min. Through the adjusting of PID parameters, the error of speed can be stabilized within 5r/min, the system exhibits very good performance. Both hardware implementation and software control algorithms are reliable. The system has a wide range of practical value.
A Method for Graph Compression
Authors: Wang Hai Tang
Published: March 2013

Image compression principle is to ensure a certain degree of image quality in the premise, a mathematical calculation method of the amount of data of the image to minimize. In order to more save memory space and more be used as a compressed representation of a image, a image is mapped into a graph, we give a new method for graph compression.
Research on Encryption Algorithm Based on the Chebyshev Neural Network
Authors: Feng Liu , Li Luo , Liu Jin Zhou
Published: March 2013

The author gives an insight of some CNNs-based cryptosystems, and then figure out the encryption algorithm based on the Chebyshev neural network is not as secure as it is announced since any attacker is able to decrypt the cipher-text by network synchronization.
Measuring Dynamic Sales Impacts of LBA Using Wireless Communication Technology
Authors: Liu Zong Jin , Yang Yang , Fang Zheng , Xu Yan Yan
Published: March 2013

Because of rapid development of wireless communication technology, there is an increasing adoption of mobile advertising, such as location based advertising (LBA). To what extent can LBA improve advertising effectiveness is an important topic in the field of wireless communication technology research. Most researches quantify long term impacts of advertisings by VAR (Vector Autoregressive) model. However, compared to VAR model, VECM (Vector Error Correction Model) is a better method in that it allows one to estimate both a long-term equilibrium relationship and a short-term dynamic error correction process. In this study, we employ VECM to explore LBA’s (Location Based Advertising) and PUA’s (Pop-up Advertising) sales impact in both short and long terms. The developed VECM reveals that LBA’s sales impact is about more than2 times as big as PUA’s in short dynamic term and nearly 6 times bigger than PUA’s in long equilibrium term. These findings add to advertising and VECM literatures. These results can give managers more confident to apply wireless communication technology to advertising.
Research and Design of a LC-VCO for 3.125Gbps Serial Communication Applications
Authors: Duan Ji Hai , Sheng Huang , Zheng Chen , Xu Wei Lin
Published: March 2013

A LC voltage-control oscillator（LC-VCO） with two stage LC cross coupling structure is designed for serial communication applications. The design constraints and tradeoffs among power dissipation and startup condition, tank amplitude, tuning range are executed using graphical optimization method. This design strategy leads to a good phase noise performance which is demonstrated through design example. This LC-VCO is implemented using 0.18-m RF CMOS process. The post-simulation results show that the circuit has an output frequency from 3.23G to 3GHz, and phase noise is -125.2dBc/1MHz. The VCO only occupies a chip area of 600m*800m, and it consumes 16 mW. A Comparison to prior arts further supports this design example and its optimization technique. The most important thing of this work is that a method of separating variables to analyze design problems is suggested.
The Password Mechanism Analysis and Research Based on the Chaos Searching
Authors: Gao Xiao Ling , Luo Li
Published: March 2013

Through analysis and research about Baptista and Alvarez chaotic encryption algorithm, the author points out that the Baptisata algorithm is not high efficiency in practical application, the cryptograph distribution is easy to be attacked by known plaintext; Alvarez algorithm can be deducted key information through the tent map and there is hidden information leakage. The more complex chaotic mapping can be used to instead of tent map, but scheme are not safe even after the changing , there are still many problems, this reflects that the use of chaotic mapping to achieve information security still has a long way to go.
Analyzing an Example Based on FastCAM NC Profiling Software
Authors: Du Chun Ping , Xu Dao Fen
Published: March 2013

FastCAM software integrates drawing, nesting and programming to a package for the CNC cutting machine to cut flat steel, specifically cut by plasma, flame, laser and water knife, etc. Software operating procedure is introduced, and an example analyzed shows that cutting efficiency, material rate and quality of products can be improved, if the operator has professional practice skill on FastCAM software.
Research of CamShift Algorithm Used in Object Tracking of Selfvision Underwater Robot
Authors: Xiang Wei
Published: March 2013

It is difficult for self-vision underwater robot to track object, and the tracking process is frequently inaccurate, unstable or even loss goals. To solve the above questions, Continuously Adaptive Mean Shift Algorithm (CamShift) is used in object tracking of self-vision underwater robot in this paper. We build a software experimental platform by VC++6.0 and Opencv1.0, with the external camera to capture video, and then apply Camshift algorithm in the environment, in which background color is not similar to the object to realize the real time tracking. The experimental results show the effectiveness of the algorithm for self-vision underwater robot.
Study on Quality Management of Logistics Equipment Systems
Authors: Zhou Liang Sheng , Tan Zhen Dong , Wu Wei Guo
Published: March 2013

The research and manufacture of the military logistics equipment systems always brings problems in quality management for its complexity and particularity. To solve these problems, a analysis on equipment quality management is conducted. A comprehensive study on reliability, fault diagnosis, and risk analysis models are also performed. The reliability analysis of the system is fulfilled using a method of combined fuzzy inference and network analysis. This method solves the limitations of the traditional network analysis method, of which the result is defined for every failure mode. The abnormality of parameters corresponds to faults in the system, which can be used to establish a knowledge database and a fault diagnosis expert system. A quantitative risk assessment model is set up using a fuzzy comprehensive evaluation method and an incident loss comprehensive evaluation theory. Finally, the above method and model are examined for new trailer mounted equipment. The results validate the proposed method
Chelating Agent EDDS in Removal of Copper (II) with Three Adsorption Materials
Authors: Zhu Jian Zhong , Chen Sheng Lu , Zhu Rui Rui , Chen Guan Huan , Cao Yang
Published: March 2013

Recently, chelating agents have been widely applied to remove heavy metals for their highly effective capacities. In this study, three kinds of adsorption materials, 719 strongly basic anion exchange resin, γ-Al2O3 and activated carbon, were investigated to remove copper(II) under the existence of chelating agent EDDS. Adsorption isotherm and kinetics of copper(II) were assessed in batch experimental systems, pH and initial concentrations were also conducted to evaluate the effects on copper(II) removal. Results indicated the adsorption capacity with three absorbents was enhanced from 0.62, 7.26, 6.73 mg/g to 17.21, 24.68, 24.90 mg/g respectively when the chelating agent EDDS existing in aquatic phase. The experimental isotherms are fitted to Langmuir and Freundlich models, results show that 719 strongly basic anion exchange resin and γ-Al2O3 have good correlation coefficients obtained from Langmuir model, and activated carbon is better to fit the Freundlich model.
Reduction of Benzo[A]Pyrene in Coal Tar Pitch with Cross Linking Monomers
Authors: He De Min , Gu Jun , Huang Yang Liu , Wu Di , Zhao Shu Chang , Zhang Qiu Min
Published: March 2013

This paper investigated the reduction of benzo[a]pyrene (BaP) in coal tar pitch by modifying with 1,4-Benzenedimethanol, Divinylbenzene and Trioxymethylene. Coal tar pitch was modified by these Cross linking monomers respectively. The content of BaP in product was determined. The results indicated that 48.28% BaP was reduced in modified pitch with 12% divinylbenzene at 130°C for 3 hours; 66.38% BaP was reduced in modified pitch with 25%1, 4-Benzenedimethanol at 120°C for 1 hour; Furthermore, 92.24% BaP was reduced in modified pitch with 25% trioxymethylene at 110°C for 0.5~1h. Pure BaP was blended with trioxymethylene. The C13 N.M.R.spectras of raw material and product were determined, the mechanism probably including C-alkylation.
Damage Detection for Offshore Platforms Based on Modal Redundancy Index of Damaged Member
Authors: Zhang Wei , Shi Xiang , Xu Xiao Long
Published: March 2013

According to the phenomenon that global damage detection of jacket platform is influenced by structure redundancy of damaged member, the concept of modal redundancy index (MRI) of damaged member is proposed. Through numerical simulation by means of mode strain energy method, the way that MRI of damaged members in different types and positions changed was studied, as well as the relationship between MRI and global damage detection. The numerical simulation result demonstrated that when MRI of pile element is less than 2.1×103, damage can be detected; when MRI of slanted brace element is less than 1.5×105, damage can be detected; when MRI of horizontal brace element is more than 5.8×105, damage cannot be detected. Therefore MRI can be a reference index in engineering application of global damage detection of offshore platforms.
Fire Risk Assessment Procedure of Underground Commercial Street Based on Infectious Disease Model
Authors: Xie Hua , Zhang Xu , Niu Hui Chang
Published: March 2013

The fire risks of spreading trends and spreading processes of Underground Commercial Street were digitalized in this work combining with the analog of the ‘infection propagation’ model, and a dynamic fire risk model was established with the consideration of fire risk flow. This investigation will provide effective data support for the initial planning, designing and fire prevention in various stages of Underground Commercial Street.