检索结果-南通市图书馆

Shift-characteristics and bounds of thermal performance of organic Rankine cycle based on trapezoidal model

Science China(Technological Sciences) 2018年第12期61卷 1802-1813页

作者： LI XinGuo WANG JingYi wu xiaosong School of Mechanical Engineering Tianjin University Key Laboratory of Efficient Utilization of Low and Medium Grade Energy

In consideration of the constraints of actual working fluids on theoretical study of organic Rankine cycle(ORC), a trapezoidal cycle(TPC) with theoretical model to simulate ORC was proposed in previous works. In this study, mathematical models of working fluids including model of simulated saturation curve(MSSC) and model of linear saturation lines(MLSL) are proposed and built. Combining mathematical models of working fluids and TPC, the thermodynamic characteristics and principles of TPC(or ORC) can be studied or predicted theoretically. There exists a shift-curve of net power output with corresponding shifttemperature of heating fluid for working fluids, which indicates the shift of net power output from having optimum condition of maximum power to monotonic increase with evaporation temperature. This shift-characteristic is significant to working fluid selection and evaluation of cycle performance, for it indicates that cycle without optimum condition can yield higher net power output than the cycle with optimum condition. Equations to calculate the shift-temperature in ORC(or TPC) are derived; and equations to calculate the highest optimal evaporation temperature and highest maximum power as the highest optimum condition at this shift-temperature are obtained. Based on TPC and its theoretical model, the lower and upper bounds of thermal performance(maximum power and corresponding thermal efficiency) of TPC(or ORC) can be demonstrated and acquired. TPC can develop to Carnot cycle or trilateral cycle that it is significant to use TPC as a generalized cycle to study the general principles and characteristics of the cycles.

关键词： organic Rankine cycle (ORC) trapezoidal cycle (TPC) mathematical models of working fluids shift-temperature of heating fluid for working fluid bounds of thermal performance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Development process of muzzle flows including a gun-launched missile

引用

Chinese Journal of Aeronautics 2015年第2期28卷 385-386页

作者： Zhuo Changfei Feng Feng wu xiaosong School of Mechanical Engineering Nanjing University of Science and Technology

Numerical investigations on the launch process of a gun-launched missile from the muz- zle of a cannon to the free-flight stage have been performed in this paper. The dynamic overlapped grids approach are applied to dealing with the problems of a moving gun-launched missile. The high-resolution upwind scheme （AUSMPW ＋） and the detailed reaction kinetics model are adopted to solve the chemical non-equilibrium Euler equations for dynamic grids. The development process and flow field structure of muzzle flows including a gun-launched missile are discussed in detail. This present numerical study confirms that complicated transient phenomena exist in the shortly launching stages when the gun-launched missile moves from the muzzle of a cannon to the free- flight stage. The propellant gas flows, the initial environmental ambient air flows and the moving missile mutually couple and interact. A complete structure of flow field is formed at the launching stages, including the blast wave, base shock, reflected shock, incident shock, shear layer, primary vortex ring and triple point.

关键词： Blast flow field Chemical reaction Computational fluiddynamics Dynamic overlapped grids Gun-launched missile Muzzle flows

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental investigations on cavity-actuated under-expanded supersonic oscillating jet

引用

Chinese Journal of Aeronautics 2015年第5期28卷 1372-1380页

作者： Sun Bo Luo Xiaochen Feng Feng wu xiaosong Department of Aerospace Engineering Nanjing University of Science and Technology

As one type of potential flow control actuators, cavity-actuated supersonic jet oscillators, which consist of a 2-D convergent nozzle and two face to face cavities, need to be investigated dee- ply to get the knowledge of their oscillating feature and underlying mechanism. Wind tunnel testing are conducted under different back pressures in a vacuum-type wind tunnel for two supersonic jet oscillators, to obtain their characteristics and the conditions for jet oscillating. The experimental results show that the continuous, nearly symmetric or asymmetric flipping between the two cavities appears over certain nozzle pressure ratio （NPR） range for both oscillators according to schlieren visualizations. Compared to the free jet, the oscillating jet with large exit achieves larger mixing; the oscillating jet with small exit has less mixing, based on the analysis of jet axial peak velocity and the entrainment. The cross-junction mode for estimating the resonance frequency in a pipe with two closed side branches is modified and obtained comparable estimations of the frequency of jet flipping with experimental data, but further investigations are needed to discover the underlying mechanism for the jet flipping.

关键词： Jet cavity interactions Jet flipping Oscillating jet Supersonic jet Wind-tunnel testing

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rational design of large anomalous Nernst effect in Dirac semimetals

引用

npj Computational Materials 2023年第1期9卷 258-264页

作者： Panshuo Wang Zongxiang Hu xiaosong wu Qihang Liu Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology518055 ShenzhenChina State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsand Collaborative Innovation Center of Quantum MatterPeking University100871 BeijingChina Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology518055 ShenzhenChina Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology518055 ShenzhenChina

Anomalous Nernst effect generates a transverse voltage perpendicular to the temperature *** has several advantages compared with the longitudinal thermoelectricity for energy conversion,such as decoupling of electronic and thermal transports,higher flexibility,and simpler lateral ***,a design principle beyond specific materials systems for obtaining a large anomalous Nernst conductivity(ANC)is still *** this work,we theoretically demonstrate that a pair of Dirac nodes under a Zeeman field manifests an odd-distributed,double-peak anomalous Hall conductivity curve with respect to the chemical potential and a compensated carrier feature,leading to an enhanced ANC compared with that of a simple Weyl semimetal with two Weyl *** on first-principles calculations,we then provide two Dirac semimetal candidates,i.e.,Na3Bi and NaTeAu,and show that under a Zeeman field,they exhibit a sizable ANC value of 0.4 Am^(-1)K^(-1) and 1.3 Am^(-1)K^(-1),respectively,near the Fermi *** an approach is also applicable to ferromagnetic materials with intrinsic Zeeman splitting,as exemplified by a hypothetical alloy NaFeTe2Au2,exhibiting an ANC as high as 3.7 Am^(-1)K^(-1) at the Fermi *** work provides a design principle with a prototype band structure for enhanced ANC pinning at the Fermi level,shedding light on the inverse design of other specific functional materials based on electronic structure.

关键词： structure Nernst Dirac

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Facile and fast growth of high mobility nanoribbons of ZrTe5

引用

Chinese Physics B 2020年第6期29卷 69-74页

作者： Jingyue Wang Jingjing Niu Xinqi Li Xiumei Ma Yuan Yao xiaosong wu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Peking UniversityBeijing 100871China Institute of Physics Chinese Academy of SciencesBeijing 100190China Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter Peking UniversityBeijing 100871China Department of Physics South University of Science and Technology of ChinaShenzhen 518055China

Recently, ZrTe5 has received a lot of attention as it exhibits various topological phases, such as weak and strong topological insulators, a Dirac semimetal, a three-dimensional quantum Hall state, and a quantum spin Hall insulator in the monolayer limit. While most of studies have been focused on the three-dimensional bulk material, it is highly desired to obtain nanostructured materials due to their advantages in device applications. We report the synthesis and characterizations of ZrTe5 nanoribbons. Via a silicon-assisted chemical vapor transport method, long nanoribbons with thickness as thin as 20 nm can be grown. The growth rate is over an order of magnitude faster than the previous method for the bulk ***, transport studies show that the nanoribbons are of low unintentional doping and high carrier mobility, over30000 cm2/V·s, which enable reliable determination of the Berry phase of π in the ac plane from quantum oscillations. Our method holds great potential in growth of high quality ultra-thin nanostructures of ZrTe5.

关键词： ZrTe5 nanoribbons growth chemical vapor transport mobility

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On the Onsager-Casimir reciprocal relations in a tilted Weyl semimetal

引用

Chinese Physics B 2022年第9期31卷 123-127页

作者： Bingyan Jiang Jiaji Zhao Lujunyu Wang Ran Bi Juewen Fan Zhilin Li xiaosong wu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsPeking UniversityBeijing 100871China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100871China

The Onsager-Casimir reciprocal relations are a fundamental symmetry of nonequilibrium statistical *** we study an unusual chirality-dependent Hall effect in a tilted Weyl semimetal Co_(3)Sn_(2)S_(2) with broken time-reversal *** is confirmed that the reciprocal relations are *** two Berry curvature effects,an anomalous velocity and a chiral chemical potential,contribute to the observed Hall effect,the reciprocal relations suggest their intriguing connection.

关键词： Onsager-Casimir relations tilted Weyl semimetal chirality-dependent Hall effect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TKEA Makes an Tinpact in Beijing

引用

Women of China 1999年第7期 45-46页

作者： wu JING and WANG xiaosong A RONG

LOOK at the newly openedIKEA and you can’t say that theconsumer market of Beijing is notbooming. Every Saturday and Sunday bothsides of the street in front of IKEAare packed to the hilt withcustomers’ cars. Latecome... 详细信息

关键词： TKEA Makes an Tinpact in Beijing

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

羊奶的功能特性及其掺假鉴别方法研究进展

引用

中国乳品工业 2022年第2期50卷 38-42,46页

作者：吴小松国家药品监督管理局高级研修学院研修二部北京100073

乳及乳制品能够为人体提供多种营养组分,如蛋白质,脂肪,碳水化合物,矿物质及维生素等等。而近些年来,羊奶因其丰富的营养特性而在世界范围内越来越受到欢迎。具体而言,其干物质的含量较牛奶稍高。并且,羊奶中的过敏源蛋白质较低,可降低... 详细信息

乳及乳制品能够为人体提供多种营养组分,如蛋白质,脂肪,碳水化合物,矿物质及维生素等等。而近些年来,羊奶因其丰富的营养特性而在世界范围内越来越受到欢迎。具体而言,其干物质的含量较牛奶稍高。并且,羊奶中的过敏源蛋白质较低,可降低人体的过敏现象。此外,羊奶脂肪球较小、脂肪碳链短,乳糖不耐发生率较低。羊奶还可作为一种天然的抗生素,能够提高人体免疫力。因而,羊奶作为一种营养食品,适宜多种特殊人群食用,尤其适合孕妇,老人和小孩。伴随着羊奶价值的升高,羊奶掺假的问题也逐渐凸显,开发检测羊奶掺假的方法变得尤为必要。本文对羊奶的营养成分、功能特性以及羊奶掺假鉴别方法进行综述,旨在为今后羊奶产品的开发与品质提升提供理论参考。

关键词：羊奶营养成分功能作用掺假

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

跳仓法在广州南站大截面预应力架空结构中的应用

引用

施工技术(中英文) 2012年第4期41卷 34-36+86页

作者：吴小松中国中铁建工集团有限公司深圳分公司

介绍了跳仓法混凝土施工技术在广州南站超大截面、大跨度、大面积、高架预应力结构中的施工应用。通过专家组对各施工方案的充分论证,确定采用跳仓法进行施工。首先讲述了跳仓法的工艺原理,结合本工程实例介绍跳仓法施工中的分仓设计和... 详细信息

介绍了跳仓法混凝土施工技术在广州南站超大截面、大跨度、大面积、高架预应力结构中的施工应用。通过专家组对各施工方案的充分论证,确定采用跳仓法进行施工。首先讲述了跳仓法的工艺原理,结合本工程实例介绍跳仓法施工中的分仓设计和跳仓顺序,阐述了原材料选择、配合比优化和入模温度控制,指出了混凝土施工要点及养护措施。

关键词：火车站混凝土跳仓法预应力架空结构

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Special issue: Contemporary mega-project and program management

引用

Journal of Management Science and Engineering 2020年第3期5卷 147-149页

作者： James Jiang Gary Klein Wayne Huang Shan Liu xiaosong wu Taiwan University TaiwanChina University of Colorado Colorado SpringUSA Southern University of Science and Technology Guang DongChina Xi'an Jiaotong University ShannxiChina

*** management and its benefits This Special Issue of the Journal of Management Science and Engineering brings attention to mega-project and pro-gram management ***,organizations perform two main functions:RUN and TRA... 详细信息

关键词： benefits research. management

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：