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Photocatalytic desulfurization of gasoline by TiO2 coupling with ultrasonic

Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology 2010年第4期38卷 428-433页

作者： Chen, Song-Xuan Zhao, Jing-Lian Su, Ci State Key Laboratory of Multiphase Flow in Power Engineering Department of Environmental Engineering Xi'an Jiaotong University Xi'an 710049 China

The photocatalytic oxidation of dibenzothiophen (DBT) in octance (as solvent) was conducted using O2 in air as the oxidant, TiO2 prepared by sol-gelatin method as the photocatalyst and coupling with ultrasonic. The effect of light distance, photocatalyst amount, reaction time, DBT initial concentration and ultasonic power on the removal of DBT were investigated deeply. The results show that the degradation rate of DBT increases by 10% by using ultrasonic. Under the conditions of TiO2 dosage of 2 g/L, air flow rate of 800 mL/min, distance of UV light of 20 cm, initial concentration of DBT of 600 mg/L, reaction time of 150 min, ultrasound power of 500 W, the degradation rate of DBT can reach up to 72.6%.

关键词： Ultrasonics

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A MEMS resonator-type viscosity sensor based on triangular cantilever

A MEMS resonator-type viscosity sensor based on triangular c...

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2010 International Conference on Mechanic Automation and Control engineering, MACE2010

作者： Zhao, Libo Zhang, Guiming Jiang, Zhuangde Liu, Zhigang State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an China State Key Lab. of Multiple Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781424477388

A MEMS (Micro Electro-mechanical System) resonator-type viscosity sensor with range from 0 to 1 mPa·s was presented with good frequency response and high sensitivity. Its sensitive chip with a triangular cantilever structure was investigated. This paper studied the operating principle of the MEMS resonator-type viscosity sensor. The natural frequency of the sensitive chip was deduced with its structure size in theory, which was validated with ANSYS finite element software. The modal analysis and harmonic response analysis for the sensitive chip with triangular cantilever structure were performed to determine the resonant mode of the MEMS viscosity sensor. Finally, the layout and fabrication processes of the sensitive chip of the MEMS resonator-type viscosity sensor were designed and studied. The sensitive chip with small size, high sensitivity and high temperature resistance was fabricated with MEMS technology on SOI (Silicon on Insulator) monocrystalline in order to achieve real-time on-line measurement of fluid viscosity. ©2010 IEEE.

关键词： Natural frequencies

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Effect of Noble Metal in CdS/M/TiO ₂ for Photocatalytic Degradation of Methylene Blue under Visible Light

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International Journal of Green Nanotechnology: Materials Science and engineering 2010年第2期1卷 M94-M104页

作者： Shen, Shaohua Guo, Liejin Chen, Xiaobo Ren, Feng Kronawitter, Coleman X. Mao, Samuel S. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China Lawrence Berkeley National Laboratory University of California at Berkeley Berkeley CA 94720 United States

The CdS/M/TiO 2 (M = Ag, Ru, Au, Pd, and Pt) three-component nanojunction systems were constructed using a two-step photodeposition method, and evaluated for their photocatalytic activities through the degradation of ... 详细信息

The CdS/M/TiO ₂ (M = Ag, Ru, Au, Pd, and Pt) three-component nanojunction systems were constructed using a two-step photodeposition method, and evaluated for their photocatalytic activities through the degradation of methylene blue in aqueous solution under visible light irradiation. The authors found that the photocatalytic activity of CdS/M/TiO ₂ (M=Ag, Ru, Au, Pd, Pt) three-component nanojunctions was superior to that of CdS/TiO ₂ two-component system. Moreover, the photocatalytic activity of the three-component nanojunction system was found to be dependent significantly on the type of the noble metals. The results can be explained by the influence of charge transfer on the basis of the work functions of different noble metals. © 2010 Copyright Taylor and Francis Group, LLC.

关键词： CdS/M/TiO 2 heterojunction noble metal photocatalysis Z-scheme

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A MEMS density sensor based on mircro-rectangular cantilever

A MEMS density sensor based on mircro-rectangular cantilever

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2010 International Conference on Mechanic Automation and Control engineering, MACE2010

作者： Zhao, Libo Huang, Enze Jiang, Zhuangde Liu, Zhigang State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an China State Key Lab. of Multiple Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781424477388

A rectangle cantilever-type micro density sensor was researched based on MEMS (Micro Electro-mechanical System) technology. A Ti-Pt-Au coil and a Wheatstone full bridge were made on the top of the rectangle cantilever-type sensitive chip. The sensitive chip was placed in uniform strong magnetic field. The resonant frequency of the sensitive chip was changed with the change of the AC current's frequency. The resonant frequency of rectangle cantilever could be measured through the Wheatstone full bridge circuit and lock-in amplifier, and then the fluid density associated with the resonant frequency of the sensitive chip could be calculated. The static analysis, modal analysis, a first-order and third-order harmonic response analysis of the rectangle cantilever were performed with ANSYS software. The best locations of the four force-sensitive resistor of Wheatstone bridge were studied. ©2010 IEEE.

关键词： Natural frequencies

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Research on the flow Pattern of Bubble Plume in an Aeration Tank

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AIP Conference Proceedings 2010年第1期1207卷 646-652页

作者： W. H. Liu T. Wan W. Cheng Yuichi Murai aKey Laboratory of Northwest Water Resources and Environmental Ecology of Education Ministry Xi’an University of Technology Xi’an 710048 China bState Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710048 China cDivision of Energy and Environmental System Hokkaido University Sapporo Japan

The flow pattern of gas‐liquid two‐phase flow in an aeration tank is of critical effect upon mass transfer by the convection. Bubble plume provides unsteadily fluctuating two‐phase flow during the aeration. This paper the study on the unsteady structure of bubble plume is dealt with from experiment. The time‐serial bubble plume images of different cases in tank have been analyzed. The RCC‐PIV has been employed to calculate the velocities in those cases, and then the time‐serial vortex, the total turbulence intensity, the time‐serial streamline are obtained. It has been shown that the aspect ratio and void fraction are the dominant factors influencing the unsteady structure of bubble plume. When the aspect ratio is unity and the void fraction gets higher, the bubble plume has symmetrical vortex structure and longest residence time, which is beneficial for optimizing the aeration system and enhancing the applied range of bubble plume.

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Experimental study on pressure and temperature distributions for low mass flux steam jet in subcooled water

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Science China(Technological Sciences) 2009年第6期52卷 1493-1501页

作者： JunJie Yan XinZhuang Wu DaoTong Chong State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

A low mass flux steam jet in subcooled water was experimentally *** transition of flow pattern from stable jet to condensation oscillation was observed at relatively high water *** axial total pressures,the axial and radial temperature distributions were measured in the jet *** results indicated that the pressure and temperature distributions were mainly influenced by the water *** correlations corrected with water temperature were given to predict the dimen-sionless axial pressure peak distance and axial temperature distributions in the jet region,the results showed a good agreement between the predictions and ***,the self-similarity property of the radial temperature was obtained,which agreed well with Gauss *** present work,all the dimensionless properties were mainly dependent on the water temperature but weakly on the nozzle size under a certain steam mass flux.

关键词： dimensionless self-similarity steam jet condensation temperature distribution total pressure

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On Dynamic Behavior of Triangular Shaped Cantilevers in MEMS Sensors: Effect of Curvature

On Dynamic Behavior of Triangular Shaped Cantilevers in MEMS...

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2010 10th IEEE International Conference on Solid-state and Integrated Circuit Technology(第十届固态和集成电路技术国际会议 ICSICT-2010)

作者： Guo-Ying Yuan En-Ze Huang Gui-Ming Zhang Zhuang-De Jiang Li-Bo Zhao Yong Li Zhi-Gang Liu State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 State Key Laboratory of Tribology Tsinghua University Beijing 100084 China State Key Lab of Multiple Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)9781424457977

A study on the effect of curvature of triangular shaped cantilevers in MEMS sensors was presented. 3-D models were performed by using the SolidWorks software. And modal analysis and harmonic response analysis were carried out on different types of geometrically configured triangular shaped cantilevers using ANSYS software. The results included the variation of natural frequencies of cantilevers and maximum equivalent von mises strain on the cantilevers with respect to radius of curvature of triangular shaped cantilevers. According to the finite element analysis results, the curvature did affect dynamic behavior of triangular shaped cantilevers in MEMS sensors. Usually, the curvature is induced by the surface stress due to microprocessing or any change of temperature, etc. Therefore, in order to achieve a steady state of strain for the MEMS sensors, it's better to eliminate the surface stress and make the cantilever transform from a curved cantilever to a straight cantilever.

关键词： CANTILEVER Curvature Surface stress Triangular Microelectromechanical systems Sensors Microtechnology Response analysis

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Extension of the pressure correction method to zero-Mach number compressible flows

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Science China(Technological Sciences) 2009年第6期52卷 1583-1595页

作者： HE YaLing HUANG Jing TAO YuBing TAO WenQuan State Key Laboratory of Multiphase Flow in Power Engineering School of Energy&Power EngineeringXi’an Jiaotong UniversityXi’an 710049China

In the present paper,the classical pressure correction method was extended into low Mach number compressible flow regime by integrating equation of state into SIMPLE *** self-developed code based on this algorithm was applied to predicting the lid-driven cavity flow and shock tube prob-lems,and the results showed good agreement with benchmark solutions and the Mach number can reach the magnitude of as low as *** attenuation of sound waves in viscous medium was then *** results agree well with the analytical solutions given by theoretical *** demonstrated that the present method could also be implemented in acoustics field simulation,which is crucial for thermoacoustic simulation.

关键词： thermoacoustic engine pressure correction method low Mach number compressible flow

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The 6th International Symposium on multiphase flow, Heat Mass Transfer and Energy Conversion (ISMF2009)

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International Journal of Hydrogen Energy 2010年第13期35卷 7027-7027页

作者： Liejin Guo State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

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Numerical simulation on forced convection heat transfer in porous media using Gibson‐Ashby constitutive model

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AIP Conference Proceedings 2010年第1期1207卷

作者： J. X. Wang P. Y. Jia Y. S. Wang L. Jiang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

In this article, using Gibson‐Ashby constitutive model, we suggest a new method for numerical investigation of forced convection heat transfer in porous foam metal, and try to consolidate the study for mechanical property and that for thermal characteristic. By available experimental data, we simulated to two cases, namely as the transfer in porous media for diameter is 0.6 mm and porosity is 0.402, and for diameter is 1.6 mm and porosity is 0.462. The result, from our constitutive model for single forced convection heat transfer, corresponds well with the experimental data. As for pressure drop prediction in porous is in good agreement with experiment, and the error is only 5% to 10%, but for transfer is less accurate, the error is about 20%, which is acceptable in practice. So it is done that constitutive model is used to simulate the transfer property.

关键词：

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