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Molecular Architecture of Cobalt Porphyrin Multilayers on Reduced Graphene Oxide Sheets for High Performance Oxygen Reduction Reaction

Molecular Architecture of Cobalt Porphyrin Multilayers on Re...

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International Conference on Nanoscience & Technology,China 2013(ChinaNANO 2013)(中国国际纳米科学和技术大会)

作者： Hongjie Tang Huajie Yin Jiangyan Wang Nailiang yang Dan Wang Zhiyong Tang National Center for Nanoscience and Technology ChinaBeijing 100190China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesNo.1 BeiertiaoZhongguancunBeijing 100190P.R.China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesNo.1 BeiertiaoZhongguancunBeijing 100190P.R.China

Development of non-precious-metal electrocatalysts is believed as the key for realization of scale-up applications of the proton exchange membrane fuel *** of the most promising types of non-precious-metal catalysts is carbon-supported transition metal-nitrogen (C/M-Nx) materials (M =Co, Fe, Ni, Mn, etc., and normally x =2 or 4).In this article, a novel molecular design strategy, in which the multilayers of Co2+ ions and porphyrin are fabricated onto the surface of the reduced graphene oxide sheets by the layer-by-layer assembly technique, is suggested for production of the cost-effective and high-efficient catalysts.

关键词： cobalt porphyrin multilayers layer-by-layer oxygen reduction reaction

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A Suitable BaO-B2O3-SiO2 Sealing Glass for Planar Intermediate Temperature Solid Oxide Fuel Cells (ITSOFC)

A Suitable BaO-B2O3-SiO2 Sealing Glass for Planar Intermedia...

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2013年能源颗粒前沿研讨会暨第三届全国能源颗粒材料学术研讨会

作者： Lian Peng Qingshan Zhu State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesNo.1 Zhongguancun North Second StreetBeijing 100190P.R.China

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Performance and emission characteristics of a hydrogen-enriched compressed-natural-gas direct-injection spark ignition engine diluted with exhaust gas recirculation

Performance and emission characteristics of a hydrogen-enric...

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作者： Liu, Y.-F. Liu, B. Zeng, K. Huang, Z. Zhou, L. Sun, L. State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Compressed natural gas (CNG) has been widely used in city buses or taxis because of its relatively low price and great abundance. Most of the CNG engines externally mix the natural gas with the intake air and utilize a lean-burn strategy to achieve low nitrogen oxide (NOx) emissions and high fuel economy. However, the well-examined external mixing of gas fuel with the intake air will result in a volumetric efficiency loss at high engine loads and may cause backfire when the natural gas is enriched with hydrogen. Also, the lean-burn technique may not sufficiently satisfy increasingly restricted future legislation. In this paper, the use of the stoichiometric equivalence ratio with exhaust gas recirculation (EGR) was investigated experimentally on a direct-injection spark ignition engine fuelled with hydrogen-natural-gas blends. Attention is focused on the advantages of combining EGR with hydrogen enrichment. The results show that hydrogen enrichment increases the brake mean effective pressure, which dramatically deteriorates under high-level EGR. Optimal efficiencies are achieved with an EGR rate of 5-10 per cent;the NO x emissions can be decreased by about 80per cent with 25 per cent EGR dilution, but the combustion variation increases simultaneously. With hydrogen enrichment, the combustion variation can be controlled under 5per cent, while the NOx, hydrocarbon, and carbon monoxide emissions are kept at a low level. Worse EGR tolerance was exhibited for the late-injection-timing case. © Author 2011.

关键词： Efficiency

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Nanomaterials for renewable hydrogen production,storage and utilization

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Progress in Natural Science:Materials International 2012年第6期22卷 522-534页

作者： Samuel S.Mao Shaohua Shen Liejin Guo Lawrence Berkeley National Laboratory and Department of Mechanical Engineering University of California at Berkeley.BerkeleyCA 94720United States Lawrence Berkeley National Laboratory and Department of Mechanical Engineering University of California at Berkeley.BerkeleyCA 94720.United States International Research Center for Renewable Energy.State Key Laboratory of Multiphase Flow in Power Engineering.Xi'an Jiaotong University International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong University

An ever growing demand for energy coupled with increasing pollution is forcing us to seek environmentally clean alternative energy resources to substitute fossil *** rapid development of nanomaterials has opened up new avenues for the conversion and utilization of renewable *** article reviews nanostructured materials designed for selected applications in renewable energy conversion and *** review is based on the authors’ research,with particular focus on solar hydrogen production,hydrogen storage and hydrogen *** topics include photoelectrochemical(PEC) water splitting and photocatalytic hydrogen production, solid-state hydrogen storage,and proton exchange membrane fuel cells(PEMFCs).It is expected that the rational design of nanomaterials could play an important role in achieving a renewable energy based economy in the coming decades.

关键词： Nanomaterials Renewable energy Hydrogen production Fuel cell Hydrogen storage

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Experimental investigations on flow instabilities in a forced circulation loop at near-critical and supercritical pressures

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AIP Conference Proceedings 2013年第1期1547卷

作者： Lei Zhang Haijun Wang Hongfang Gu Shouxu Qiao Xiaobao Shi Yushan Luo State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao tong University Xi'an 710049 China

Properties of supercritical water will undergo drastic changes near the "pseudo critical" point which gives rise to a serious concern about flow instabilities under supercritical conditions. To investigate the fluid flow behaviors, experiments with different system pressures (near-critical and supercritical pressure) were conducted on the Xi'an Jiao tong University's (XJTU) supercritical water test facility. Large amplitudes of mass flow flux as well as inlet pressure were found in various operation conditions. Mechanism of this unusual flow instability behavior is discussed. The oscillation behavior occurring in the present work has also been compared with that under the subcritical pressures and parameters effects are also studied.

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Research on Behavior of Corrugated Packing in Vacuum Distillation Tower

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China Petroleum Processing & Petrochemical Technology 2012年第2期14卷 39-43页

作者： Wang Yubo Qiu Xingqi Miao Haibin Xu Zhan State Key Laboratory of Multiphase Flow in Power Engineering Xi 'an Jiaotong University Xi 'an 710049 College of Chemistry and Chemical Engineering China University of Petroleum Qingdao 266555 PetroChina Dagang Petrochemical Company Tianjin 300280

The corrugated packing is prone to break down easily, which can affect the tower efficiency substantially. It is the inner environment of the vacuum distillation tower including the temperature and chemical nature of fluid that lead to the packing damage. The theoretical analysis indicates that it is the inner material flow of vacuum distillation tower that leads to the vibration of packing, which can affect the corrosion fatigue of packing significantly. Meanwhile, the modal shape and inherent frequency of packing under prestress can be obtained by means of mathematical analysis. Based on the two kinds of analysis, the flow induced vibration and corrosion fatigue are accountable for the failure of packing.

关键词： flow induced vibration theoretical analysis mathematical analysis inherent frequency corrosion fatigue

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Synthesis and characterization of Zn-doped MgAl layered double hydroxide nanoparticles for PVC thermal stabilizer

Synthesis and characterization of Zn-doped MgAl layered doub...

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International Conference on Nanoscience & Technology,China 2013(ChinaNANO 2013)(中国国际纳米科学和技术大会)

作者： Gongling Wang Mei Yang Zhiwen Li Kaifeng Lin Quan Jin Dan Wang State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of SciencesBeijing 100190 (P.R.China) State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of SciencesBeijing 100190 (P.R.China) Academy of Fundamental Interdisciplinary SciencesHarbin Institute of TechnologyHarbinHeilongjiang (P.R.China) Academy of Fundamental Interdisciplinary SciencesHarbin Institute of TechnologyHarbinHeilongjiang (P.R.China)

Zn-doped MgAl layered double hydroxides (LDHs) with M2+/M3+=2 and different molar ratios of Mg/Zn have been synthesized by modified homogeneous co-precipitation method and characterized by powder x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), fourier transform infrared spectrum (FT-IR) and thermogravimetry and differential thermal analysis (TG-DTA) *** as-synthesized plate-like LDHs nanoparticles have an average diameter around 90nm and thickness about 20nm.

关键词： layered double hydroxide molar ratio of Mg/Zn thermal stability PVC

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Enhancement of flow-jet combined boiling heat transfer of FC-72 over micro-pin-finned surfaces

Enhancement of flow-jet combined boiling heat transfer of FC...

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作者： Zhang, Yonghai Wei, Jinjia Guo, Dong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China YanTai WanHua Group YanTai 264000 China

For highly efficient solving of the power dissipation problem of electronic components with high heat flux, experimental study of the flow-jet combined boiling heat transfer on silicon chips was conducted. Micro-pin-fins with dimensions of 30×60 μm2 and 30×120 μm2 (thickness × height) were fabricated on the chip surfaces by the dry etching technique. The experiments were made at three different cross-flow velocities Vc (0.5, 1.0, 1.5 m/s) and different jet velocities V j (0-2 m/s) with two liquid subcooling ΔTsub (25°C and 35°C). A smooth surface was also tested for comparison. The micro-pin-fins showed a considerable heat transfer enhancement due to an increase in effective heat transfer surface area caused by micro-convection around micro-pin-fins. The maximum allowable heat flux qmaxis increased and the wall superheat is decreased greatly. For a given Vc, the heat transfer enhancement is more significant as Vj increases, but the qmax increment decreases as Vc increases. The fin efficiency decreases as Vcor/and Vj increases or the heat flux q increases. The maximum q max can reach 161 W/cm2 at Vc == 1.5 m/s, Vj = 2 m/s, ΔTsub = 35°C for chip PF30-120. © 2012 by Begell House, Inc.

关键词： Heat flux

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key factors in chaperonin-assisted protein folding

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Particuology 2012年第1期10卷 105-116页

作者： Ying Ren Jian Gao ji Xu Wei Ge Jinghai Li State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China

Incorrect folding of proteins in the macromolecular crowding environment in living cells would cause cellular disasters. All cells have developed their structurally and functionally distinct classes of molecular chaperones to help normative proteins fold to their native structures, one of which is the most studied GroELIES complex. In the present article, large-scale all-atom explicit solvent molecular dynamics （MD） simulations have been carried out on rhodanese folding in a series of chaperonin mutants for 200ns to understand the mechanism therein. In accordance with experimental results, two factors have been identified to play a significant role, the geometrical confinement effect of the folding cavity and the charge effect of the inner surface of the cavity. Our analysis of the properties during simulation suggests that the GroEL/ES complex directly exerts force on the contacting residues of the substrate, thus assists substrate folding.

关键词： Molecular dynamics simulationExplicit solventChaperoninProtein folding

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An experimental study of on-line measurement of water fraction in gas-oil-water three-phase flow

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AIP Conference Proceedings 2012年第1期1428卷 128-135页

作者： K. Chen L. J. Guo J. Ye State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China aState Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Gas-oil-water two-or three-phase flow is widely encountered in industry, such as petroleum chemical industry, bio-chemicals, food chemicals, and mineral engineering and energy projects. Two kinds of on-line measurement technique, which are double-ring conductance sensor and double-helical capacitance sensor, for water fraction in oil-water two-phase flow and gas-oil-water three-phase flow were developed in this paper. The calibration results shows that the responses of the two sensors are good enough as the variation of water fraction. And on the other hand, it is possible that the oil and the gas regard as one phase in gas-oil-water three-phase flow by using double-helical capacitance sensor, and the ratio between water and gas has no effect with the output signal. The range of water fraction which can be measured becomes bigger and bigger because of the using of new circuit. So the capacitance sensor is better enough to measure water fraction in the three phases flow. During dynamic experiment, because of phase inversion phenomenon between oil and water, the conductance sensor outputs poorly, however the capacitance sensor performs somewhat fine. The reason for the error using capacitance sensor is the edge effect of the capacitance. The experiment results show that the edge effect of the double-helical capacitance sensor causes that the output is smaller so that the measuring water fraction is a litter larger than the actual value. And when the variation of water fraction is above 10%, the edge effect of capacitance sensor can be almost neglected. On the contrary, when the variation of water fraction is below 10%, the edge effect is so lager than the results above that it cannot be ignored. Consequently, the double-helical capacitance probe is more suitable for measuring water fraction in slug flow and oil-water emulsion, in which the results agree better with static calibration than that in bubble flow.

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