bluuebunny/crossref_metadata_2025 huggingface dataset:
Computational Modeling of Surface Fracture of Polyethylene Acetabular Cup in Total Artificial Hip Replacement
Authors: Lai Yuan Lung , Chiang Fu Tsai , Hung Jui Pin
Published: February 2011

In this paper, a crack analysis model based on finite element method and virtual crack extension technique was proposed to investigate the occurrence of surface fracture of polyethylene acetabular cup under gait loadings. To this, a simplified hip joint model was created for facture analysis. The stress intensity factor (SIF) at crack site was estimated and used to evaluate the propagation of the surface crack. Current results show that under normal gait loading, the SIF at crack tip within polyethylene cup was predicted to be lower than the fatigue threshold of polyethylene material. However, under the heel strike instant, the crack tip SIF exceeds the fracture strength of polyethylene subject to gamma radiation, which may drive the crack to propagate to final fracture. Overall, the presented analysis model has demonstrated the probability of severe surface damage occurring in polyethylene cup under impact walking conditions. This provides a valuable reference to the improvement of the mechanical properties or design of bearing materials in clinical orthopedic application.
Synthesis and Bioactivity of 2-((5-Mercapto-1, 3, 4 -Oxadiazol-2-Yl) Methyl) Benzo[d] Isothiazol -3(2H)-One as Potential Microbiocide
Authors: Xu Feng Ling , Lin Cun Guo , Lin Qiang
Published: February 2011

2-((5-mercapto-1, 3, 4 -oxadiazol-2-yl) methyl) benzo[d]isothiazol-3(2H)-one was synthesized and characterized by means of IR, 1H NMR, MS. The compound was tested preliminarily against the bacteria including Escherichia coli, Staphyloccus aurueus, Vibrio alginolyticus, Aeromonas hydrophila and Bacillus subtilis. The results show the title compound has good antimicrobial activity. Isothiazol-3(2H)-ones, 1,2-benzisothiazol-3(2H)-ones, and their heterocyclic bioisomeric derivatives are potent industrial microbiocides with antifungal and antibacterial activities[1,2], highly potent platelet aggregation inhibitor[3], anti-inflammatory, analgedic and anti-pyretic activities[4]. And the biocide 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one is a nonmetallic and nonenvironmentally persistent biocide, which has been registered in several countries as an antifouling agent and has gained approval in the USA and Environmental Protection Agency[5]. Isothiazolones represent a class of versatile intermediates in the synthesis of heterocyclic compounds [6]. According to above facts and the principle of combination of bioactive sub-structure, we herein designed and synthesized benzisothiazolone derivatives2-((5-mercapto-1, 3, 4 -oxadiazol-2-yl) methyl) benzo[d] isothiazol -3(2H)-one, as shown in Scheme 1.
Research on Grinding Characteristics of Ultrasonic Aided Grinding
Authors: Ren Sheng Feng , Gao Chang Qing , Ma Ru Jian
Published: February 2011

Experimental study of radial ultrasonic vibration aided grinding of sintered Nd-Fe-B permanent magnetic material was conducted contrasted with traditional grinding. The effect on normal grinding force of grinding parameters was analyzed respectively in the two grinding processes. Experimental results indicate that the discontinuous grinding mechanism caused by ultrasonic vibration is the main factor that reducing the normal grinding force. The process of radial ultrasonic vibration aided grinding is especially suitable for shape machining of sintered Nd-Fe-B permanent magnet.
Fixed-Bed Column Study for Zn (II) Removal from Solution Using Raw Rice Husk
Authors: Deng Zai Fang , Luo Xue Gang , Lin Xiao Yan
Published: February 2011

A ﬁxed bed of raw rice husk was used for the removal of Zn (II) from aqueous solution. The material as adopted was found to be an efficient media for the removal of Zn (II) in continuous mode using ﬁxed bed column. Different column design parameters like depth of exchange zone, flow rate and initial concentration were calculated. When conducted with Zn (II) concentration 10 mg.L-1 and flow rate 10 ml.min-1 with different bed depths such as 3, 6 and 9 cm, the equilibrium uptake was 3.366, 2.847 and 2.764 mg.g-1, respectively. The equilibrium uptake decreased from 2.802 to 1.975 mg.g-1 with increasing of flow rate from 5 to 15 mL.min-1 and increased from 2.764 to 3.798 mg.g-1 when initial concentration increased from 10 to 30 mg.L-1. The dynamics of adsorption process was modeled by bed depth service time (BDST), and indicating the validity of BDST model when applied to the continuous column studies.
The Preparation and Characteristics on Chitosan Nano-Carrier with Different Concentration of TPP
Authors: Chou Chih Wei , Hsieh Hui Hsuan , Wu Te Hsing
Published: February 2011

In this Study, the Tripolyphosphate-Chitosan (TPP-CS) Nano-Carrier was Prepared by Polyelectrolyte Complexation. TPP and CKGM are Polyanion, and can Interact with Cationic Chitosan by Electrostatic Forces. the Nanoparticles Size was Analyzed by the Transmission Electron Micrographs (TEM) and Scattering Electron Micrographs (SEM). FTIR Confirmed Tripolyphosphoric Groups of TPP and CKGM Linked with Ammonium Groups of Chitosan in the Nanoparticles. the CS Nps were Loaded with the Anticancer Drug, Berberine, by Different Concentration of Cross-Linking Agent. the Zeta Potentials of CKGM and CS were Shown as a Function of Ph. it was Observed that CS has Strong Interaction with CKGM about Ph 5.5. the CKGM-CS Nanoparticles were Formed by Mixed Different Weight Ratio of CS and CKGM. the Morphology of CKGM-CS was Characterized by FESEM. the Size of CKGM-CS Particles was Smaller than 150 Nm. the Zeta Potential of CKGM-CS Particles was Proved that the Polymer Ratio can Control the Charge Density.
Analysis and Design of a Cylindrical MR Valve
Authors: Huang Jin , Chen Song , Wang Ping
Published: February 2011

A magnetorheological (MR) valve is a device that uses the MR fluid flowing through a cylindrical orifice. In this paper, based on volumetric flow rate equation in the cylindrical MR valve, the necessary active MR fluid volume and the thickness between two cylinders of the valve are carried out. They are the minimum active fluid volume and gap of MR fluid exposed to the magnetic field. The equations for the volume and the gap derived to provide the theoretical foundation for the key geometric design in the valve. The results indicate that the volumetric flow rate can be continuously adjusted by an external magnetic field. The thickness and the volume for the cylindrical MR valve can be calculated based on MR fluid properties, the desired control pressure ratio, and the pressure of the valve.
The Effect of Organic Compounds on the Crystal Structure of Zinc Hydroxystannate
Authors: Xu Jian Zhong , Hu Ke , Xie Ji Xing
Published: February 2011

The polyhedral crystals, octahedral crystals and cube crystals of Zinc hydroxystannate (ZHS) were prepared by the homogeneous precipitation synthesis method. The organic compounds, PEG-400, β-cyclodextrin (β-CD) and L-alanine were added in the reaction systems to control the crystal structure. The crystal structure and morphology of products were characterized by SEM and XRD. The crystal structure of all products could be attributed to the cubic ZnSn(OH)6 by the XRD analysis. The SEM pictures of the products were different with the change of organic compounds. The FTIR spectrum indicated the ZHS without organic residual and the possible formation mechanism was discussed.
Photocatalytic Activity of W Doped Ta2O5 Particles for Methylene Blue Degradation under UV-Light
Authors: Zhao Yan Hong , Hou Li Chun , Li Xiang , Yang Xiaodong , Wang Xiao Jing
Published: February 2011

Tungsten doped tantalum oxide (W-Ta2O5) particles were synthesized by a low temperature hydrothermal method. The phase structure of W-Ta2O5 particles was characterized by X-ray diffraction (XRD). The XRD results indicated that the samples belonged to orthorhombic crystal. The photocatalytic activity of samples was investigated with degradation methylene blue (MB) under ultraviolet light. The degradation efficiency of MB under the catalysis of W-Ta2O5 particles attained 91% when the reaction time was 7 h. The kinetics of MB degradation was respect to the first-order in the presence of the photocatalysts.
Effects of Nb Content on Young’s Modulus and Tensile Property of Ti-30Ta Alloy for Biomedical Applications
Authors: Wang Yun Neng , Ma Yun Qing , Yang Shui Yuan , Liu Xu Liang , Wang Cui Ping , Liu Xing Jun
Published: February 2011

The effects of Nb addition on microstructures, Young’s moduli, tensile properties of Ti-30Ta-xNb (x = 21, 24, 27, 30, wt. %) alloys were investigated in this study. The results show that dual phases containing β phase and a little α" martensite were observed when x = 21 and 24, whereas single β phase is present when x = 27 and 30. A minimum Young’s modulus of 52.13 GPa was obtained in Ti-30Ta-21Nb alloy. Ti-30Ta-xNb alloys exhibit high strength-to-modulus ratios, showing their great potentials to develop as new candidates for biomedical applications.
Effect of Pre-Deformation and Ageing on Compressive Behavior of Ti-58.25wt%Ni Alloys at Room Temperature
Authors: Zhu Shi Chun , Lu Xiao Feng , Gong Jian Ming
Published: February 2011

In this paper, effect of pre-deformation and ageing on compressive behavior of Ti-58.25wt%Ni was investigated at room temperature. Through range analysis of three factors and three levels on transformation temperature measured by DSC, ageing at 673K enhanced phase transformation temperature obviously, the As temperature could reach 308.02K. Transformations of B2-B19’ and B2-R-B19’ appeared after the treatments. Saw tooth shape phenomenon on the loading curves indicating the typical martensitic transformation was also observed. Dynamic balance due to compatible action among various phase under increased load kept the slope of the loading curves constantly. Pre-deformation by 0.2% resulted in higher compressibility (4.9%), and ageing at 523K caused better recovery (95.4%).
A Fast Synthesis and Sintering of Mg2Si1−xSnx (0≤x≤1.0) Solid Solutions by Microwave Irradiation
Authors: Zhou Shu Cai , Bai Chen Guang , Fu Chun Lin
Published: February 2011

In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Sil-xSnx solid solutions, Mg2Sil-xSnx solid solutions have been prepared by Microwave-assisted Synthesis techniques. The heating behavior of Mg, Si and Sn fixed powder was investigated under microwave irradiation. X-ray diffraction (XRD) was used to characterize the powders. The results suggest that the temperature-rising rate is also dependent on the initial green density and higher green density provides lower heating rate while power setting are fixed. XRD patterns show that Mg2Sil-xSnx solid solutions have been well formed under microwave irradiation.
Study on the Composite Strengthening Effect of Talc and Kyanite Addition on Corundum–Mullite Based Ceramic Foam
Authors: Ji Shu Jun , Guo Xue Yi , Dong Jian Xiong , Su Peng
Published: February 2011

Corundum–mullite based ceramic foams were prepared by adopting foam impregnation process with raw talc and kyanite as modifiers. By comparing the sinters strength among the original formula with and without talc and kyanite added, it can be seen that when 6wt% raw talc was added, the compressive and flexural strength of the sintered foam ceramic bodies are increased by 108.9% and 33% respectively more than the original formula. Adding 4wt% ball-milled kyanite on this basis, the compressive and flexural strength were further elevated 20.1% and 29.1%, respectively, and meanwhile, the sintering shrinkage rate was dropped by 54.2%.
Superconductivity in SmFeAsO0.8F 0.2 Synthesized by High Pressure High Temperature Treatment
Authors: Hua Zheng He , Zhang Heng , Peng Ju
Published: February 2011

Superconducting SmFeAsO0.8F0.2 compound was successfully synthesized by high pressure high temperature treatment with pressure of 6 G Pa at 1400 °C for 2 hours. The X-ray diffraction pattern of the sample indicates the formation of the tetragonal ZrCuSiAs-type SmFeAsO0.8F0.2 with lattice parameters a=3.932 Å and c=8.490 Å. The electrical transport study shows that the sample has a rather high transition temperature Tc of about 52 K, and magnetic field effect on the resistance reveals a rather high upper critical field HC2 of about 65 T.
Foamed Metal Materials Preparation Technology
Authors: Wei Jian Ning , Xu Gao Ping , Zhou Li Ling , Zhou Xue Yun , Xie Wei Jun
Published: February 2011

The paper presents the technology of preparation about foamed metal materials, which were prepared by an air pressure infiltration process.
Effect of Structure Modification on the Microwave Absorbing Performance of Carbon Foams
Authors: Fang Zhi Gang , Gao Yu Xin , Fang Chun
Published: February 2011

Carbon foams were prepared by a polymer sponge replication process and their microwave absorbing properties were investigated. The electric conductivity of carbon foam has a direct effect on its microwave absorbing property, as the carbon foam with a medium electric conductivity of 0.46S/m has got a relatively excellent microwave absorbing property and demonstrated a characteristic of broadband absorption. Some structure modification has been made on carbon foams to fruther imrove their microwave absorbing performance. The result shows that making slots, especially gradient slots on the surface of carbon foams can greatly improve their microwave absorbing properties, while the reflection coefficients for a three-layered carbon foam structure exceeds -10dB with the combination effect of multilayer structure design and parameters gradient variatioin in the whole frequency range of 2.6-18GHz, which is usually to be considered as the practical application standard for microwave absorbing materials.
Effects of Polyvinyl Pyrrolidone on Electromagnetic Properties of Hexagonal Ferrite Prepared by the Sol-Gel Method
Authors: Huang Xiao Gu , Chen Jiao , Han Peng De , Wang Hong Zhou , Yan Shao Teng , Wang Li Xi , Zhang Qi Tu
Published: February 2011

Ba(Zn0.3Co0.7)2Fe16O27 hexagonal ferrites have been prepared by sol-gel method. Effects of polyvinyl pyrrolidone (PVP) on crystalline phase, natural surface and electromagnetic properties were analyzed. The XRD patterns of samples with and without PVP added both showed the single phase of hexagonal ferrite. The particle thickness increased when PVP was added. Moreover, Ferrites prepared with 2.0g PVP added into the sol solution had lower complex permittivity. Addition of PVP can be an effective way to obtain the electromagnetic match of hexagonal ferrites.
Fire Retardant Cellulose Characterized by Thermal Degradation Behavior
Authors: Gao Ming , Yan Yu Qing
Published: February 2011

Cellulose treated with fire retardant was studied by thermogravimetry (TG), differential thermal analysis (DTA) and limiting oxygen index (LOI). The kinetic parameters for the thermal degradation are obtained following the method of Broido. For the fire retardant cellulose, the activation energy and decomposition temperature were much decreased while char yield and LOI were increased. The main thermal decomposition of the samples with higher LOI occurs at lower temperatures, while that with lower LOI occurs at higher temperatures.
Hydrogen Embrittlement of Low Carbon HSLA Steel during Slow Strain Rate Test
Authors: Zhao Jing Wei , Chun Young Soo , Lee Chong Soo
Published: February 2011

The hydrogen embrittlement of a low carbon HSLA steel has been investigated by means of slow strain rate test (SSRT) on circumferentially notched specimens. Hydrogen was introduced into specimens by electrochemical charging and the diffusible hydrogen content was measured by thermal desorption spectrometry (TDS) analysis. The activation energy of hydrogen desorption in the present steel was calculated to be 12.75 kJ/mol after TDS analysis. The peak stress and displacement during notch tensile tests had been found to decrease simultaneously with diffusible hydrogen content, which could be expressed by two power law relationships, respectively. Fracture surface was a cleavage type indicating that the steel had high susceptibility of hydrogen embrittlement.
Fractal Characters of Micro-Pores in the Sinter
Authors: Zhang Qing Jun , Mo Wen Ling , Li Yuan Liang , Zhang Yu Zhu
Published: February 2011

The pore in the sinter is an important character. Because of multiphase and asymmetry in the sinter, the structure of the pore is very complex. To study the character of the pore effectively, the method of mercury intrusion porosimetry is applied to measure the pore in the sinter, and the results are dealt with by the fractal theory. The results prove that the pores in the sinter are actually fractal structure when the size of the pores is more than 204.5 nm because their curves in the log-log plot are linear, and some curves qualified with the linearity obviously possess of the segment linearity character. According to the calculation of the fractal D, the relationship of the strength and fractal D will be established.
First-Principles Study of Hydrogen Molecules Adsorbed on Al-Doped BN Sheets
Authors: Ma Sheng Qian
Published: February 2011

Hydrogen is a clean, abundant, no-toxic, renewable fuel and packs more energy per unit mass than others. It is important to find a efficient way to store it. Hydrogen molecules adsorbed on the Al doped BN sheets are investigated by using density function theory (DFT) calculations. The results indicate that the H2 molecule is very easy to be absorbed on the doped BN sheet of B substituted by an Al atom (AlB-BN), which is most stable structure in all the Al doped configurations. Therefore, AlB-BN is a promising material in storage H2.
Integration Study of Micro Reformer and High Temperature PEM Fuel Cell
Authors: Su Ay , Liu Ying Chieh , Lin Wei Chieh , Cheng Chih Kai , Leu Jai Houng
Published: February 2011

An integration platform assembling with methanol reformer and high-temperature proton exchange membrane fuel cell (PEMFC) was constructed in this present. The methanol micro reformer combines with catalytic reaction section and reforming section. Catalytic reaction section with Pt calalysis maintains the constant temperature envoriment for reforming process. SRM reforming results show the 74%~74.9% hydrogen and 23.5%~25.7% of carbon dioxide in the mixture product. Less than 2% of carbon monoxide was produced. Using the reforming product of low carbon monoxide concentration and the highest methanol conversion rate, a micro reformer links with fuel cell integration experiment was performed. Results show the high temperature PEMFC with 3 ~ 4W power output under methaol flow rate 15ml/hr. Due to the lower of hydrogen pressure supplying from the micro reformer, may cause the fuel cell power output become unstable.
Chemical Degradation of the Silicone Rubber in Simulated PEMFC Environments
Authors: Li Guo , Tan Jin Zhu , Gong Jian Ming
Published: February 2011

The long term stability and durability of gaskets made of silicone rubber in proton exchange membrane fuel cell (PEMFC) has important effect on the sealing and the electric-chemical performance of the fuel cell. In present paper, the time-dependent chemical degradation of a silicone rubber was studied in three simulated PEMFC environments. The test temperature was selected and used at 90°C in this study according to the actual PEM fuel cell operation. Optical microscopy was used to show the topographical changes on the sample surface. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy was employed to study the surface chemistry of the gasket material before and after exposure to the simulated PEM fuel cell environments over time. The results show that the weight loss increased with the exposure time for the samples. Optical microscopy reveals that the surface conditions of the samples changed over time from initially smooth to rough, crack appearance and finally crack propagation. The ATR-FTIR results show that the surface chemistry changed significantly via de-crosslinking and chain scission in the backbone for the material over time.
Mg-Ni-H Hydrogen Storage System Prepared by Controlled Hydriding Combustion Synthesis
Authors: Liu Jing , Li Qian , Chou Kuo Chih
Published: February 2011

The Mg2NiH4 hydrogen storage material was successfully prepared by controlled hydriding combustion synthesis (CHCS) from Mg and Ni powders in a high magnetic field. The effects of magnetic intensity on the structure, phase compositions and the hydriding/dehydriding (A/D) properties of the composite are investigated. As a result, a high magnetic field promotes the formation of Mg2NiH4. The PCT results show that the maximal hydrogen capacity at 573 K is 3.59 wt.%. The comparison of the hydrogen A/D results under the different conditions suggested that 4 T is the optimal magnetic intensity in our trial.
Study on the Photocatalytic Degradation of Diesel Pollutants in Seawater by a Stannum- Doped Nanometer Titania
Authors: Yu Xiao Cai , Du Qian , Zhu Peng Fei , Hu Dong Dong , Yang Li
Published: February 2011

TiO2 can be used as a photocatalyst because of its semiconductor property. When TiO2 is doped with transition metal ions, its electronic properties may be modified. In this work, nanosized Sn4+-doped TiO2 (TiO2-Sn4+) particles have been synthesized by a sol-gel process at different temperature. Their microstructure and crystal structure depending on the calcination temperatures were investigated using XRD and SEM techniques. The photocatalytic degradation of diesel pollutants in seawater was investigated by using Sn4+-doped nanometer TiO2 under UV irradiation. In the experiment, the effect of different ratio of Sn4+ doped into TiO2, the effect of calcination temperature of Sn-doped nano-TiO2, the effect of Sn4+-doped nanometer TiO2 dosage, pH value and photocatalytic degradation reaction time, respectively, on the removal of diesel pollutants in seawater was investigated. On the basis of the results of these experimental data, the optimal experimental conditions for photocatalytic degradation of diesel are tried through the orthogonal test. The results reveal that when the ratio of Sn4+ doped into TiO2 was 3% wt, the calcination temperature of Sn-doped nano-TiO2 was 400°C, the Sn4+-doped nanometer TiO2 dosage was 1 g/L, pH value was 8 and photocatalytic degradation reaction time was 1.5h, respectively, the removal rate of diesel pollutants in seawater was expected to reach 88.00 %.
Preparation and Characterization of Expanded Graphite with TiO2 Composites
Authors: Wang Li Qin , Yang Xiang Ni , Zhao Xiu Li , Zhang Rui Jun , Yang Yu Lin
Published: February 2011

The composites of expanded ghaphite with TiO2 (EG/TiO2) have been prepared in the method of precursor mixing, and the optimum preparation conditions have been studied. The morphology and crystal structure of the EG/TiO2 composites have been characterized by the means of SEM and XRD. Also their performance of decolorization for methyl orange solution has been researched. The results are shown as follows: the EG/TiO2 composites maintain the rich porous and network structure of EG, and a lot of anatase TiO2 particles widely distribute on surfaces and in layers of EG. Compared with TiO2 sol, taking tetrabutyl titanate as titanium source, the prepared EG/TiO2 composites have better performance. Increasing the added amount of tetrabutyl titanate, the decolorization rate of methyl orange solution increases at first, and then decreases. When adding 2 mL tetralbutyl titanate, the decolorization rate is at the peak, up to 98.4%. These results show the composites have excellent performance of decolorization for methyl orange solution. We suppose it is mainly due to the interaction between the adsorption of EG and the degradation of TiO2 particles.
Investigation of the Performance of V-W Based Catalysts at Low Temperature for NOx Reduction with NH3
Authors: Tian Xin Na , Xiao You Hong , Zhang Wen Ping , Chen Yong Wei
Published: February 2011

The most potential method of selective catalytic reduction (SCR) to remove NOx from diesel engine emissions is very effective in NOx reduction with an efficiency up to 95%. However, the current SCRs have a limitation on operation temperature and a narrow operation temperature window. In this paper, the V-W based catalysts were used in the investigation to improve the low temperature performance of NOx conversion by doping Cu and Mn into V-W based catalyst. The temperature range studied was between 150 °C and 550 °C with an interval of 50 °C. The honeycomb catalysts were prepared by an impregnation method. The study also included characterization of catalysts by BET, XRD, TPD and XPS methods.It is found that NOx conversion performance of the V-W based catalyst increases with the increase of reaction temperature. After the metal Cu or Mn doped into the catalyst, it offers an improvement in the catalytic performance. Among all the catalysts studied, the mixed metal catalyst of Cu-Mn-V-W catalyst is found the most potential one, not only because of its higher NOx conversion rate at a low temperature, but also because of its wider operation temperature window.
Preparation and Characterization of Bimetal and Nitrogen Co-Modified Titanium with Visible-Light Activity
Authors: Guan Xin Xin , Shen Wen Wen , Zhang Fu Xiang , Guan Nai Jia
Published: February 2011

TiO2 photocatalyst modified with N and Fe (Fe-TiO2-xNx) was obtained. Bimetal and nitrogen co-modified TiO2 (Ag/Fe-TiO2-xNx) was prepared by photo catalytic reduction of Ag on the Fe and nitrogen co-modified TiO2. The catalytic activity of sample for photocatalytic reduction of nitrate under visible light was tested. And the bimetal and nitrogen co-modified TiO2 was characterized by XRD, XPS, TEM and UV-vis diffuse reflectance spectrophotometry.
The Research of a New Purifying Agent on Synthesis and Performance
Authors: Zhao Xia , Zhao Yang Li , Feng Hui Xia , Luo He Ming , Xie Gang , Jiang Feng
Published: February 2011

This paper synthesis a new purifying agent on a rapid semidry process, using a natural guar gum as basic material, which was carboxymethyl guar. The factors which affect degree of substitution (DS) of carboxymethyl guar, such as the reaction temperature, the reaction time, the consumption of chloroacetic acid, and the consumption of sodium hydroxide etc were studied. The best synthesis condition was concluded. The flocculating property of the produced purifying agent was studied. Then the experiment analysis the structure and thermal stability through IR and DTA. The experiment results showed that the turbidity ratio of the micro-polluted water was better than other purifying agents. The synthetic purifying agent should have potential applications in the wastewater market.
The Stability and Regeneration Mechanism of New Visible-Light Responsive Photocatalyst Bi20TiO32
Authors: Sun Xu Hui , Wang Tao , Sun Lin , Ma Jun
Published: February 2011

This paper studied the stability and regeneration mechanism of photocatalyst Bi20TiO32. There is no change in the XRD of the catalyst after reaction, which indicates that photocatalyst Bi20TiO32 has stable structure. The comparison of XPS between used and fresh catalyst, shows that the major cause of the deactivation is the competitive adsorption of intermediates onto the surface active sites of the catalyst. Simple cleaning by deionized water, light irradiation, acid or base purging can not refresh the catalyst. However, ethanol with ultrasonic vibration can recover its activity well, as further demonstrates that the deactivation is because of that active sites are occupied by organic intermediates. Calcination is an effective way to recover the catalyst activity.
Preparation and Catalytic Performance of Ce-Y-Palygorskite Catalysts for NO Decomposition
Authors: Zou Jian Guo , Luo Ping , Liu Yan Yan , Peng Hai Long
Published: February 2011

Ce-Y-palygorskite catalysts were prepared by chemical blending method. The effect of preparation conditions on catalytic performance of Ce-Y-palygorskite catalyst for NO decomposition was investigated in a fixed bed flow reactor. The characteristics of the Ce-Y-palygorskite catalysts were studied by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The obtained results provided substantial evidence that the catalysts preparation conditions would have strong effect on the catalytic activity for NO decomposition. The Ce-Y-palygorskite catalyst prepared under the optimal conditions: rare earth content, Ce/Y, pH value of the chemical blending and calcination treatment temperature was 3%, CexY(1-x)(x=0.9), 7 and 350°C, respectively, was identified as the most active catalyst for the NO decomposition, and the denitration rate could be up to 67.3% under the experimental reaction conditions.
Study on Bleaching of the Starch Glycoside Surfactant
Authors: Wang Qing Ning , Han Ya Ni , Zhang Fei Long , Liu Fang , Zhao Qiu Ping
Published: February 2011

The technology for bleaching of the starch glycoside surfactant was studied by using hydrogen peroxide as the major decoloring agent, coupled with magnesium sulfate, sodium silicate and EDTA as additive agents. The technic of decoloration was optimized through the orthogonal experimentation. Under the optimal experimental conditions, the resulting products exhibit good stability. After 72h stability test, only a little change of 1.01% by U-2001 spectrophotometer at absorbance 470 nm. The absorbance was observed by compared with the products before decoloration and after. The main composition and structure of the starch glycoside surfactant were analyzed by infrared spectrum (IR) and gas chromatography (GC). The experimental results show that the technics of decoloration for the starch glycoside surfactant are feasible and simple which may be useful for practical applications.
Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles
Authors: Jiang Cheng Zhi , Lu Xu Dong
Published: February 2011

Pure TiO2, Eu3+ and Sm3+ co-doping TiO2 composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2 nano-particles increases after co-doping of Eu3+ and Sm3+ and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+ and Sm3+ inhibits the phase transformation of TiO2 from anatase to rutile, decreases the diameter of TiO2 nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+ and Sm3+ co-doped into TiO2 nano-particles exert a synergistic effect on their photocatalytic activity.
The Experiment Research on Related Factors of Influencing Combustion Noise of Diesel Engine
Authors: Yuan Zhao Cheng , Fang Hua , Zhao Fu Quan
Published: February 2011

The noise of Diesel engine is the main source of vehicle noise, and engine noise is divided to 3 parts: the mechanical noise, the air flow noise and combustion noise. Combustion noise is the main part of in the three. In this paper, the combustion noise variation of a vehicle diesel with parameters of engine speed, engine load, pump and injector were analyzed by experiment method, the relationship between combustion noise and the double-peak of cylinder presser rise rate were analyzed carefully, some conclusions such as the second peak of PRR(pressure rise rate) is the suitable factor reflecting combustion noise and combustion noise is the function of diesel load were gotten.
Test Verification of a New Type Damper for Piping System
Authors: Jia Jiu Hong , Wu Han Wei , Hua Hong Xing
Published: February 2011

A new type viscous damper designed especially for the anti-impact requirements of piping systems on ship is studied．In order to analyze the operating characteristic of the damper in practical application，two experiments about the new type damper was carried out. One is on the drop test machine; the other is on a real ship. The results of the drop tests showed that the shock load was smoothly and gently brought to rest and decelerated with the lower possible force, which eliminates damaging force peaks and shock damage to machines and equipment. The real explosion experiment confirmed the good anti-impact ability of the new type damper．
Nonlinear Superharmonic Resonance of Damped Circular Sandwich Plates with Initial Deflection
Authors: Du Guo Jun , Liu Xiao Man , Hu Yu Da , Yu Chao
Published: February 2011

The nonlinear superharmonic resonance phenomenon of damped circular sandwich plates under uniform load is investigated. From the movement equation of circular sandwich plate showed in displacement components, got the relevant nonlinear vibration equation by Galerkin method. Under the clamped BC. Using multi-scale method, the periodical solutions were obtained which was of nonlinear the third-order superharmonic resonance. The FRF equation of the superharmonic resonance is obtained, and the necessary and sufficient condition on stability of the vibration are obtained synchronously.The infection to the amplitude while the correlative physical and geometric parameters changing were discussed, Drew the trajectories in moving phase planes during the stabilization process, and the stabilities and singularities of the solutions are analyzed.
Additional Acceleration on Spacecrafts and Corresponding Theory for Aeronautic Manufacturing and Space Shuttle Design
Authors: Zhang Wei Jia , Lei Yang
Published: February 2011

Space probes now asks for a correction in aeronautic mechanics. Analysis of the radio tracking data from the Pioneer 10/11 spacecraft at distances between about 20–70 AU from the Sun has consistently indicated the presence of a constant acceleration of 8.6× 10−8 cm/s−2 directed towards the Sun. Currently, an independent research rises from the planetary long-term orbital evolution study and may be helpful to understand the nature of Pioneer Anomaly. Furthermore, calculation shows that the Pioneer data match with the new discovery’s prediction very well. Such nova theory will improve spacecraft and space shuttle design, and could enhance the accuracy, ensuring them into the designed orbit prompt.
Bearing-Rotor Coupled System Stability Optimization Design Based on Genetic Algorithm
Authors: Ding Yu Feng , Gan Lin , Zhou Jun Bo , Sheng Bu Yun
Published: February 2011

The structure parameter of sliding bearing has significant influence on entire shafting. The structural optimization of elliptical sliding bearing based on the genetic algorithm theory is studied in the paper. Shafting logarithmic decrement is taken as the objective function, the bearing width-diameter ratio, relative clearance and main design parameters such as ellipticity is taken as design variables. Mutual coupling effect between sliding bearing and rotor is considered in the optimization model. An elliptical sliding bearing of shafting has been optimized, and the solution result shows that the shafting stability has been increased, it indicates this method is feasible.
Study on Control Method of Smelting-Pool Width in TIG Welding Basded on Fuzzy Control
Authors: Hou Yun Hai , Li Er Shuai , Sun Shi Hua , Bai Yu
Published: February 2011

Aimed at the manufacture process of TIG( tungs-ten inert-gas) welding of copper-clad aluminum wire in enterprise, the methods of detecting and automatic tracking welding seam edge , detecting and automatic control smelting-pool width were studied and designed with fuzzy control in the paper. The experiment shows that the scheme has the advantages such as better control effect, high control precision and favorable stability.
Design a New Type of Interfered Muffler Based on Pneumatic Tools
Authors: Yuan Hui Ping , Gao Zhong Yong , Liang Ming Hui , Hu Zhi Cheng , Pan Yu
Published: February 2011

18The traditional interfered muffler has narrow noise elimination frequency range.It has large noise elimination volume only at contracting frequency part. When noise frequency is far lower than contracting frequency, the noise elimination volume will fall rapidly .Designing a composite muffler based on the principle of gas convection, sound wave diffraction, sound reflection and so on. The muffler is mainly used for noise caused by pneumatic tools. Test shows that without affecting the work performance of pneumatic tools, the muffler can be 10-12dB noise reduction, which is worthy applying.
Experimental Research on Influence of Loading Method on Dynamic Behavior of Recycled Concrete
Authors: Luo Xing Wen , Yao Hai Lin
Published: February 2011

The exploitation and application of recycled concrete are more and more extensive in latest years. But the research on the mechanics characteristic of recycle concrete under cyclic loading is very little. Six types of recycled concrete specimens were made in laboratory. After they were cured for a certain age, we have made a series of cycling loading tests on them. In the tests the maximum and minimal stress ratio, the loading frequency and loading waveform were all considered. The mechanics characteristic of recycled concrete under static loading and cyclic dynamic loading were contrasted. After analyzing the test results, we could get that the maximum stress and minimal stress ratio, the loading frequency and loading waveform influenced the unloading and loading modulus of recycled concrete directly in the tests, and the fatigue life of recycled concrete changed with the loading method.
Modal Stiffness Contributions of Components to Full Truck
Authors: Pan Shu Hua , Chen Yu Dong
Published: February 2011

In recent years, three optimal methods, size, shape and topological optimization, have been widely applied to the automotive component design and significant success have been achieved. However, most of the optimizations are limited to deal with the individual component of the truck. Because there exists the complex coupling relations between components under the assembly environment of the truck, it is difficult to deal with the component design by using the above three optimal method and it is necessary to develop a more effective method for solving the complex optimal problem under the assembly environment of full truck. To this end, the paper introduces the modal stiffness concept and develops the modal stiffness contributions of components to full truck which can identify which components are the key ones for controlling the modal frequencies. The present method is applied to a full truck analysis. The results obtained show that the proposed method is effective and the computation process is straightforward. The results can be directly used to improve the component design of full truck as a valuable guide.
Application of Two-Port Network in Bilateral Control for a Haptic Interface with Force-Position Compensation
Authors: Meng Jian Jun , Yun Jin Tian
Published: February 2011

The two-port network theory for describing the characteristics of the haptic interface is presented; the four-channel bilateral control architecture is introduced, and two control methods named position-error-based control and direct force reflection control (PEBC & DFRC) are also presented. Two main problems caused by the coupling between position and force information for transparency improvement of the haptic interface are also be discussed and a Model-Based Force-Position Compensation Strategy to enhance the transparency of the haptic interface is proposed. By embedding the compensation unit into the DFRC architecture, the Haptic Interface could be controlled with precise position and high-fidelity force feedback.
Modeling and Co-Simulation for Hydraulic System of Test-Bed of Semi-Automatic Coupler Draft Gear Based on AMEsim/Simulink
Authors: Xu Bu Suan , Ren Guan Sheng
Published: February 2011

When the test-bed tests semi-automatic coupler draft gear of the metro vehicle in the case of maximum lateral swinging angle, it requires a hydraulic motor to move the adjustable bearing base which is linked with coupler draft gear in a certain distance until it achieves the desired Angle. In this article, we adopt the valve-control motor electro-hydraulic position servo control system, in which it has the angular measuring device. Besides we optimize the effection of control system by using the fuzzy strategy. Through the AMEsim/Simulink co-simulation and analysis, the level swinging angle of coupler draft gear shows accurate, reliable and stable, which reaches the expected effection completely. With the more and more complex of the controlled object, this kind of intelligent control strategy gives an effective solution for solving complex problems.
A Synthesis and Optimal Method for Straight Line Mechanism with Burmester Points
Authors: Yin Lai Rong , Han Jian You , Yang Tong
Published: February 2011

When a Burmester point coincides with the Ball point at the inflection circle pole, given a fixed joint and the point, which is on the expecting straight-line and direction can synthesize an infinite number of mechanisms with coupler curve having a five-point contacts with its tangent, namely, Burmester point. Any displacement is corresponding to three four-bar straight-line linkages with the synthesis formulations given. The property charts, which include the bar ratio, the sum of bars, the relative straight-line length, mechanism types, and so on, are drawn by developing a mechanism software based on vc++6.0 with the solution region method. So the users can find out the involved linkages information intuitively, and also the aimlessness in choosing optimal mechanisms is avoided effectively.
Model and Simulation of Three-Section Crossbeam Based on Experimental Data
Authors: Guo Tie Neng , Guo Dong Liang , Cai Li Gang , Li Fu Ping , Song Bin
Published: February 2011

The modal experiment of the three-section crossbeam was carried out by single-input multi-output method. Identify the stiffness and damping with single-degree-of-freedom identification method. Use ANSYS software APDL programming language and experimental data to establish the finite element model of joint surface of three-section crossbeam. Use modal analysis method analysis the three-section crossbeam which establishes FEM modeling of joint surface. The comparison of the analysis result and experimental result are shown. The FEM result of the three-section crossbeam established FEM modeling of joint surface is basically tally with the experimental result, the modeling methods for joint surface is feasible.
Optimal Control Discipline Research of Hydraulic System of Sugarcane Harvester
Authors: Hu Yi Zhi , Hu Ying Chun , Hou Jun Yan , Zhu Hui
Published: February 2011

The actiyator of chassis mechanism of sugarcane harvester was a cubage flow regulation circuit consisted of a timing variable pump and a compensated flow control valve. The optimal controlling system described its movement from processing time using differential and state equations. The shortest-time optimal controlling trajectory of spring force of the variable pump was a group of concentric circles based on minimum principle, which controlling signal switched on origin trajectory. Under the condition of optimal control, the stator was pushed by spring to a new balance spot which left off origin 15.5 millimeter in the shortest time of 1.12 seconds, which provided theory base to further controlling system design. Its stability and validity has been proved well in physical product research.
A Topology Optimization Method in Fuselage Flutter Model Design
Authors: Yang Rui , Liu Yang , Zhou Liang
Published: February 2011

Airplane flutter scale model should maintain the load transfer characteristics of the original structure. It is a structural inverse problem for proper natural frequencies as well as structural simplification. This inverse problem could be solved by topology optimization. So based on bi-direction evolutionary structural optimization (BESO) method, a topology method for designing fuselage flutter model is presented. Facing porous and irregular shape often appears in topology optimization, a regular shaped grid frame structure consisted of the finite elements is discussed, including its internal mapping relationship and boundary conditions. The ratio criterion for structural modification is raised in this structural topology optimization using frequency sensitivity. Finally, this topology optimization method is applied to cylindrical fuselage flutter model design, result shown that the proposed approach is feasible to achieve given natural frequencies, maintains the character of inner frame structure completely, and the similarity between optimized structure and original structure is achieved.
Multi-Dimensional Optimization of Groove Parameters in Gas Film Seal
Authors: Ma Gang , Li Xiu Hua , Shen Xin Min
Published: February 2011

Groove parameters in gas film seal with grooved interface make an obvious impact on the performance of seal system. There are many parameters to describe the geometric features of the groove. In general, a big limitation exists in one-dimensional optimization of groove geometry. Based on particle swarm intelligence algorithm, this article proposed and carried out multi-dimensional optimization of groove geometry in gas film seal, regarded the groove geometry parameters as components of the particle, completed numerical solution of the objective function for the seal performance, and obtained better groove geometry parameters. The example showed that the effect that every geometry dimension plays on the steady-state characteristics of cylindrical gas film seal is not independent, and the multi-dimensional optimization method effectively improves the results of the objective function value. The proposed method can be used for the dimensional optimization design of groove geometry in both cylinder and face gas film seal.
Dynamic Characteristics Simulation of Luffing System for Aerial Work Platform Truck Based on Matlab/Simulink
Authors: Luo Tian Hong , Yang Xiang Lian , Luo Wen Jun , Lin Li
Published: February 2011

In this paper, the principle of work of aerial work platform truck luffing system is introduced and The mathematics model is established. With Matlab/Simulink software, the simulation model of luffing system is constructed, meanwhile the dynamical characteristics is implemented. With the research work of aerial work platform truck luffing system, this paper provides theoretical foundation for design and improve of luffing system
Optimization Design of Walking Beam Based on Stiffness Constraint
Authors: Dang Xing Wu , Huang Jian Long
Published: February 2011

The excessive deformation of walking beam which is used in automatic packaging line of cathode copperplates is analysed. The mathematical model of optimization design of the walking beam is established, using deflection less than 7mm as a constraint condition. The optimization is completed by COSMOSWorks and the most optimal deflection is 6.95mm, the most optimal mass of the walking beam is decreased 25.2%. The optimization also indicates that strength of the walking beam is surplus and further optimization is feasible.
Method of Compensation Control for Shaking Table
Authors: Li Zhen Bao , Tang Zhen Yun , Ji Jin Bao , Li Xiao Liang , Zhou Da Xing , Yan Wei Ming
Published: February 2011

This paper presents the defects existing in shaking table control including the overshoot of displacement under low-middle frequency input using three variable parameter controls, the narrow bandwidth resulting from the performance of servo-valve and low accuracy of seismic wave reproduction because of specimen and table interaction. The effects of these factors on the stability and control accuracy of shaking table are discussed, and then the reasons of these problems existing are analyzed. The aim of this paper is to improve the stability and control accuracy of shaking table, thus, some corresponding strategies for compensation control are proposed. And a series of shaking table tests with one-story frame and two-story frame for verifying the validity of compensation control algorithm are performed.