检索结果-内蒙古大学图书馆

In Situ Synthesis of Cu_(3)P/P-Doped g-C_(3)N_(4)Tight 2D/2D Heterojunction Boosting Photocatalytic H2 Evolution

Chinese Journal of Chemistry 2023年第2期41卷 173-180页

作者： Fangyong Hou Feng Liu Haochen Wu Muhammad Qasim Yi Chen Yang Duan Zhibo Feng Maochang Liu International Research Center for Renewable Energy&State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'anShaanxi 710049China School of Electronic Engineering Jiujiang UniversityJiujiangJiangxi 332005China Gree Altairnano New Energy Inc ZhuhaiGuangdong 519040China Suzhou Academy of Xi'an Jiao tong University SuzhouJiangsu 215123China

Heterojunction design in a two-dimensional(2D)fashion has been deemed beneficial for improving the photocatalytic activity of g-C_(3)N_(4)because of the promoted interfacial charge transfer,yet still facing ***,we construct a novel 2D/2D Cu_(3)P nanosheet/P-doped g-C_(3)N_(4)(PCN)nanosheet heterojunction photocatalyst(PCN/Cu_(3)P)through a simple in-situ phosphorization treatment of 2D/2D CuS/g-C_(3)N_(4)composite for photocatalytic H2 *** demonstrate that the 2D lamellar structure of both CuS and g-C_(3)N_(4)could be well reserved in the phosphorization process,while CuS and g-C_(3)N_(4)in-situ transformed into Cu_(3)P and PCN,respectively,leading to the formation of PCN/Cu_(3)P tight 2D/2D *** to the large contact area provided by intimate face-to-face 2D/2D structure,the PCN/Cu_(3)P photocatalyst exhibits significantly enhanced charge separation efficiency,thus achieving a boosted visible-light-driven photocatalytic *** highest rate for H2 evolution reaches 5.12 umol·h^(-1),nearly 24 times and 368 times higher than that of pristine PCN and g-C_(3)N_(4),*** work represents an excellent example in elaborately con-structing g-C_(3)N_(4)-based 2D/2D heterostructure and could be extended to other photocatalyst/co-catalyst system.

关键词： Photocatalysis Water splitting 2D/2D heterojunction g-C_(3)N_(4) Energy conversion Charge transfer Nanosheet photocatalyst

来源：评论

学校读者我要写书评

暂无评论

A Comprehensive Review on Multi-Dimensional Heat Conduction of Multi-Layer and Composite Structures:Analytical Solutions

引用

Journal of Thermal Science 2021年第6期30卷 1875-1907页

作者： AMIRI DELOUEI Amin EMAMIAN Amin SAJJADI Hasan ATASHAFROOZ Meysam LI Yueming WANG Lian-Ping JING Dengwei XIE Gongnan Department of Mechanical Engineering University of BojnordBojnordIran Mechanical Engineering Department Shahrood University of TechnologyShahroodIran Department of Mechanical Engineering Siijan University of TechnologySiijanIran School of Aerospace Engineering Xi’an Jiaotong UniversityXi’an 710049China Guangdong Provincial Key Laboratory of Turbulence Research and Applications Center for Complex Flows and Soft Matter Research and Department of Mechanics and Aerospace EngineeringSouthern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering University of DelawareNewarkDelaware19711USA International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Mechanical and Power Engineering Northwestern Polytechnical UniversityXi'an 710072China

Heat conduction in multi-layer and composite materials is one of the fundamental heat transfer problems in many industrial *** to different materials types,interface conditions,and various geometries of these laminates,the heat conduction mechanism is more complicated than that of one-layer isotropic *** solutions are the best ways to study and understand such problems in *** this study,different existing analytical solutions for heat conduction in multi-layer and composite materials are reviewed and classified in rectangular,cylindrical,spherical,and conical *** boundary conditions,internal heat source,and thermal contact resistance as the most critical parameters in the solution complexity investigated in the literature,are discussed and summarized in different *** types of multi-layer structures such as isotropic,anisotropic,orthotropic,and reinforced laminates are included in this *** is found that although more than half a century has passed since the beginning of the research on heat transfer in multi-layer composites,new researches that can help with a better understanding in this area are still being *** challenges and shortcomings in this area are also discussed to guide future researches.

关键词： multi-dimensional heat conduction composite laminates multi-layer structures analytical solutions interface contact resistance

来源：评论

学校读者我要写书评

暂无评论

Experimental investigation on some key variables during pool water flash evaporation

引用

AIP Conference Proceedings 2010年第1期1207卷 380-385页

作者： Y. L. Guo J. J. Yan D. T. Chong J. P. Liu aState Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China bDepartment of Power Engineering Xi’an Electric Power College China

An experimental study has been performed to investigate pool water flash evaporation in a rectangle chamber. The water level was at 40 mm, 60 mm, 100 mm, and 150 mm. Initial conditions of the liquid varied from 36 to 88° C temperature and 2.1 to 48° C superheat. The experimental results showed that the initial water temperature, the superheat and the water level are significant to the water temperature transients in flashing process and the value of NEF when flash evaporation calm down. Experimental study allows us to correlate the evolution of water temperature.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Thermal induced static flow instability of hydrocarbon fuel in the regeneratively cooled structures of hypersonic vehicles

Thermal induced static flow instability of hydrocarbon fuel ...

引用

18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference 2012

作者： Liu, Zhaohui Bi, Qincheng Guo, Yong Ma, Xuesong Zhao, Shujun State Key Laboratory of Multiphase Flow in Power Enigeeing Xi'an Jiaotong University Xianning West Road No.28 Xi'an 710049 China Science and Technology on Scramjet Laboratory Beijing Power Machinery Research Institute Beijing 100074 China

ISBN: (纸本)9781600869310

A simplified cooling device consisting of two parallel channels is used to simulate the regeneratively cooled structure of hypersonic vehicles. A concept of "static flow instability (SFI)" is proposed in this paper. The SFI is similar to the ledinegg instability which is primary found in the two-phase flow boiling system to explain the static flow excursion. But for hydrocarbon fuel, SFI may take place in the cooling structure at high temperature and supercritical pressure. A model is constructed to analyze the mechanism of the SFI. The pressure drop vs. flow characteristic curves are calculated from the thermopysical properties of hydrocarbon fuel, which include the heat sink and density. Experiments verify that the model is feasiable, though the accuracy of density of hydrocarbon fuel is still need to improve. At a given heating power, the pressure drop vs. flow characteristic curve is a Ntype one, which makes the same pressure drop at different mass flow rates. That triggers the SFI. Chemical craking makes the SFI much more complicated. At the relevant pressure, the pressure drop vs. flow characteristic curve becomes a quintic curve. More extreme points on the curve induces more instability. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Pressure drop

来源：评论

学校读者我要写书评

暂无评论

Sensitive cesium measurement in liquid sample using low-pressure laser-induced breakdown spectroscopy

Sensitive cesium measurement in liquid sample using low-pres...

引用

作者： Wang, Zhen Zhen Yan, Jun Jie Liu, Ji Ping Deguchi, Yoshihiro Katsumori, Shunpei Ikutomo, Akihiro State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China Graduate School of Advanced Technology and Science University of Tokushima Tokushima770-8501 Japan Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi'An Jiaotong University Xi'an710049 China

The environmental pollution by trace heavy metals is a severe problem for the environment and human health. In this paper, the liquid jet of CsNO3 solution employed was introduced to the measurement chamber and detected using laser-induced breakdown spectroscopy (LIBS) directly at low pressure to determine the detection features of trace Cs element in liquid. The distinct and round plasma can be acquired when reducing the pressure. The interaction between the plasma core of the liquid jet and the surrounding gas can be controlled to enhance Cs detection ability. Cs emission was mainly in the surrounding area in the plasma. The influences of laser focal point and plasma measurement area on the measured signals were studied under low-pressure condition. When employing the defocus mode and varying the measurement area within a certain range, Cs signal and the signal-to-background ratio were improved. Cs detection limit can reach to 22.8 ppb (3σ/ms) at pressure of 26 kPa in this paper. According to the discussion, the detection limit will be enhanced when improving the experimental conditions using this method, which shows the great application potential of liquid sample measurement. © 2015 Elsevier B.V. All rights reserved.

关键词： Laser induced breakdown spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Improvement of SIMPLER algorithm for incompressible flow on collocated grid system

Improvement of SIMPLER algorithm for incompressible flow on ...

引用

作者： Cheng, Y.P. Lee, T.S. Low, H.T. Tao, W.Q. Laboratory of Fluid Mechanics Department of Mechanical Engineering National University of Singapore Singapore Singapore State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an Shaanxi China Laboratory of Fluid Dynamics Department of Mechanical Engineering National University of Singapore 10 Kent Ridge Crescent 119260 Singapore Singapore

In this article an Improved SIMPLER (CLEARER) algorithm is proposed to solve incompressible fluid flow and heat transfer problems. Numerical study shows with the CLEARER algorithm on a collocated grid, in the correction stage the velocities on the main nodes are overcorrected with the pressure correction, which lowers the convergence rate;hence a second relaxation factor is introduced to overcome this disadvantage. By setting this factor less than the underrelaxation factor for velocities, the convergence performance can be significantly enhanced;meanwhile, the robustness can also be increased. Four numerical examples with reliable solutions are computed to validate the CLEARER algorithm, and the results show that this algorithm can predict the numerical results accurately. Compared with the SIMPLER algorithm, CLEARER can enhance the convergence rate greatly, and in some cases it only needs as little as 17% of the iterations required by SIMPLER to reach the same convergence criterion.

关键词： Incompressible flow

来源：评论

学校读者我要写书评

暂无评论

An improved moving particle semi-implicit method for simulating viscous free surface flows without compressible stress instability

An improved moving particle semi-implicit method for simulat...

引用

7th International Conference on Fluid Mechamics(ICFM7)(第七届国际流体力学会议)

作者： Hao Xiang Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong UniversityXi''an710049China

来源：评论

学校读者我要写书评

暂无评论

Kramers' problem and the Knudsen minimum: A theoretical analysis using a linearized 26-moment approach

Kramers' problem and the Knudsen minimum: A theoretical anal...

引用

作者： Gu, Xiao-Jun Emerson, David R. Tang, Gui-Hua Computational Science and Engineering Department STFC Daresbury Laboratory Warrington WA4 4AD United Kingdom School of Energy and Power Engineering State Key Lab of Multiphase Flow Xi'An Jiaotong University Xi'an 710049 China

A set of linearized 26 moment equations, along with their wall boundary conditions, are derived and used to study low-speed gas flows dominated by Knudsen layers. Analytical solutions are obtained for Kramers' defect velocity and the velocity-slip coefficient. These results are compared to the numerical solution of the BGK kinetic equation. From the analysis, a new effective viscosity model for the Navier-Stokes equations is proposed. In addition, an analytical expression for the velocity field in planar pressure-driven Poiseuille flow is derived. The mass flow rate obtained from integrating the velocity profile shows good agreement with the results from the numerical solution of the linearized Boltzmann equation. These results are good for Knudsen numbers up to 3 and for a wide range of accommodation coefficients. The Knudsen minimum phenomenon is also well captured by the present linearized 26-moment equations. © 2009 Springer-Verlag.

关键词： Method of moments

来源：评论

学校读者我要写书评

暂无评论

Wire‐Mesh Capacitance Tomography in Gas‐Liquid flows

引用

AIP Conference Proceedings 2007年第1期914卷 710-716页

作者： Shan‐Fang Huang Xiu‐Gang Zhang Dong Wang Zong‐Hu Lin State Key Lab. of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

A new intrusive, wire‐mesh capacitance tomography for phase distributions in horizontal pipes is presented. A wire with an insulating film is used as a capacitor. The capacitance is in direct proportion to water film thickness, independent of water distribution and the salinity. We can obtain film thickness by measurement of capacitance. The sensor consists of four parallel wire capacitors, vertically placed over the cross section of the pipe. The interface is the result of linking the discrete film thicknesses with smooth curve, which are the tomographic result only when both phases are continuous. Static and dynamic experiments were carried out in air‐water two‐phase flows in horizontal pipes, from which we analyze the disturbance factors of the sensor to the flow field and measurement error of film thickness. The experimental results show that the tomographic results are consistent with expectation. The method has several advantages of no reconstructed algorithms, high signal‐to‐noise ratio, high sensitivity, and high spatio‐temporal resolution. The disturbance and error can be neglected in the range of this paper.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of anolyte pH and cathode Pt loading on the performance of novel MFC for electricity and hydrogen coproduction

Effect of anolyte pH and cathode Pt loading on the performan...

引用

第五届世界氢能技术大会(WHTC2013)

作者： Ya-Peng Liu Yun-Hai Wang Bai-Shi Wang Qing-Yun Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：