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A Method for Determining the Operable Ideal Condensation Temperature of Dry and Isentropic Fluids Used in Organic Rankine Cycle(ORC)Based on Temperature-Entropy(T-s)Diagram

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Journal of Thermal Science 2023年第6期32卷 2144-2154页

作者： zhang xinxin LI Yang MOE key laboratory of enhanced heat transfer and energy conservation Beijing University of TechnologyBeijing100124China Beijing key laboratory of heat transfer and energy conversion Beijing University of TechnologyBeijing100124China

Condensation temperature is one of the crucial parameters determining the performance of an organic Rankine *** is necessary to consider the differences in the working fluids themselves when setting the condensation temperature of organic Rankine *** current study,temperature-entropy(T-s)diagram is employed to describe the difference in working *** areas of dry and isentropic fluids in a temperature-entropy(T-s)diagram,which are the area denoting net output work of cycle(A_(1),the area denoting net output work of the Carnot cycle(A),and the curved triangle in superheated region denoting condensation characteristics(A_(2)),are *** this basis,the ratio of A_(2)to A_(1)and the ratio of A_(1)to A are *** Mean Difference of the above two ratios is obtained to determine the operable ideal condensation temperature of 66 dry and isentropic fluids employed in Organic Rankine *** findings indicate that the operable ideal condensation temperatures for the majority of dry and isentropic fluids are in the range of 305 K to 310 *** work presented in this study may be useful for designing and establishing an Organic Rankine Cycle system.

关键词： organic Rankine cycle T-s(temperature-entropy)diagram condensation temperature dry f isentropic fluids logarithmic mean difference

论开源程序侵害网络游戏版权的法律适用——以我国网络游戏脱机模拟器现状为视角

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科技与法律（中英文） 2025年第1期 79-90页

作者：冀瑜张辛鑫中国计量大学法学院/知识产权学院杭州310018

网络游戏脱机模拟器是一种基于“泄露源码”或参照游戏画面编写而成的计算机软件,目的是在离线状态下调动客户端资源,复原网络游戏体验。其主要依托的开源协议本质是一种特殊的私法自治,开源内容的正当性应源于代码作者的有权让渡。而... 详细信息

网络游戏脱机模拟器是一种基于“泄露源码”或参照游戏画面编写而成的计算机软件,目的是在离线状态下调动客户端资源,复原网络游戏体验。其主要依托的开源协议本质是一种特殊的私法自治,开源内容的正当性应源于代码作者的有权让渡。而擅自将他人源码或者参照游戏画面编写的内容开源均已逾越了可让渡范围,涉嫌侵犯他人计算机软件著作权或游戏画面表达中的权利客体。然而,运用传统的计算机软件保护模式仅能从代码层面应对“泄露源码式”模拟器,却难以规制自主编写或反编译客户端等行为,间接造成此类模拟器在我国商业化流通的现状。鉴于此,建议从原作整体画面实质性相似与经济利益保护两方面予以考量,明确涉及网络游戏版权开源程序的侵权标准,以期加强网络游戏版权保护,保障我国网络游戏产业的健康发展。

关键词：网络游戏单机版 GPL协议游戏版权合理使用

Influence of Participating Media on the Radiation Thermometry for Surface Temperature Measurement

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Journal of Thermal Science 2005年第4期14卷 368-373,381页

作者： Yuying LIU xinxin zhang Department of Thermal Engineering School of Jet Propulsion Beijing University of Aeronautics andAstronautics Beijing 100083 Department of Thermal Engineering School of Mechanical Engineering University of Science andTechnology Beijing Beijing 100083

A temperature measurement model of radiation thermometry for the surface covered by participating media was developed. The model was based on the radiation heat transfer of participating media and principles of radiation pyrometers, and solved by integral formulation of discrete ordinate method on spectral waveband. The influence of water mist on the indicated temperature of Raytek MR1SB one/two color pyrometer was discussed. Mie theory was used to calculate the radiative properties of water mist. In order to verify the model, a laboratory temperature measurement experiment was executed. The result shows that temperature of radiation thermometry is sensitive to the spectral response wavelength of pyrometer, and the simulated temperature of pyrometer agrees well with the experimental measurements on a suitable wavelength. The simulated temperature was lower than the real temperature of surface for one-color pyrometer, and it could be higher or lower than the real one for two-color pyrometer with the influence of participating media.

关键词： participating media radiation thermometry surface temperature measurement discrete ordinatemethod.

A Class of Quadratic Matrix Equations over Finite Fields

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Algebra Colloquium 2023年第1期30卷 169-180页

作者： Yin Chen xinxin zhang School of Mathematics and Statistics Northeast Normal University Changchun 130024China Department of Mathematics and Statistics Queen's University KingstonK7L3N6Canada

We exhibit an explicit formula for the cardinality of solutions to a class of quadratic matrix equations over finite *** prove that the orbits of these solutions under the natural conjugation action of the general linear groups can be separated by classical conjugation invariants defined by characteristic *** also find a generating set for the vanishing ideal of these orbits.

关键词： matrix equations general linear groups finite fields separating invariants

Numerical Study of Thermal Boundary Layer on a Continuous Moving Surface in Power Law Fluids

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Journal of Thermal Science 2007年第3期16卷 243-247页

作者： Hao zhang xinxin zhang Liancun ZHENG Department of Thermal Engineering University of Science and Technology Beijing Beijing 100083 China Department of Mathematics and Mechanics University of Science and Technology Beijing Beijing 100083 China

This paper investigates flow and heat transfer of power law fluids on a continuous moving surface. The temperature distribution is obtained numerically by considering the effect of the power law viscosity on thermal diffusivity and the characteristics of the flow and heat transfer are analyzed. The results show that the distribution of the thermal boundary layer depends not only on the velocity ratio parameter of the plate, but also on the power law index and Prandtl number of fluids.

关键词： Power law fluid thermal boundary layer dimensionless transformation numerical solutions

An Analysis of the Characteristics of the Thermal Boundary Layer in Power Law Fluid

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Journal of Thermal Science 2008年第3期17卷 233-237页

This paper presents a theoretical analysis of the heat transfer for the boundary layer flow on a continuous moving surface in power law fluid. The expressions of the thermal boundary layer thickness with the different heat conductivity coefficients are obtained according to the theory of the dimensional analysis of fluid dynamics and heat transfer. And the numerical results of CFD agree well with the proposed expressions. The estimate formulas can be successfully applied to giving the thermal boundary layer thickness.

关键词： Thermal boundary layer Power law fluid Dimensional analysis Numerical solutions

Numerical Study on Pressure Drop Factor in the Vent-Cap of CDQ Shaft

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Journal of Thermal Science 2008年第1期17卷 69-76页

作者： Bo Song Yanhui Feng xinxin zhang Department of Thermal Engineering School of Mechanical EngineeringUniversity of Science and Technology Beijing Beijing 100083 China

In CDQ （Coke Dry Quenching） shaft, the vent-cap with complex structure is installed in the cone-shaped funnel under the cooling chamber. It acts to introduce cooling gas and support the descending coke in the chamber. The designing and installation of vent-cap aim to get relatively uniform gas distribution, to reduce the temperature fluctuation of cokes at outlet and realize stable operation of CDQ apparatus. In this paper, the turbulent flow of gas in vent-cap of 1：7 scale CDQ experimental shaft is numerically simulated by using CFD （Computational Fluid Dynamics） software, CFX. The velocity field, the outlet flux distribution and the pressure drop factor of each outlet under three kinds of vent-cap （called high vent-cap, low vent-cap and elliptic vent-cap） are analysed and compared. The results turn out that the pressure drop factor of elliptic vent-cap is larger than the other two vent-caps, and that the pressure drop factors of high vent-cap and low vent-cap almost have the same value. While for a specified vent-cap, the pressure drop factor with pressing brick is larger than that without pressing brick. The work in this paper is valuable for the designing of vent-cap for large-scale CDQ shaft.

关键词： CDQ Vent-cap Pressure drop Numerical simulation

Selection and Evaluation of Dry and Isentropic Organic Working Fluids Used in Organic Rankine Cycle Based on the Turning Point on Their Saturated Vapor Curves

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Journal of Thermal Science 2019年第4期28卷 643-658页

作者： zhang xinxin zhang Congtian HE Maogang WANG Jingfu MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Heat Transfer and Energy Conversion College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi’an 710049China

The organic Rankine cycle(ORC)is a popular technique used in the utilization of low-grade thermal *** wet,dry,and isentropic organic working fluids,the latter two types are more appropriate for ORC *** this paper,the definition of turning point on saturated vapor curve of dry fluid and isentropic fluid was given according to the shape of the saturated curve of working fluids in a T-s *** this basis,the model of near-critical region triangle was *** this model,the thermodynamic performance of 57 kinds of dry and isentropic organic working fluids in ORC was *** performance includes the relation between turning point temperature and cycle thermal efficiency,the relation between near-critical region triangle area and cycle thermal efficiency,the relation between near-critical region triangle area and exergy at turning point temperature,the relation between near-critical region triangle area and reciprocal value of slope of saturated vapor ***,working fluid selection was also conducted in terms of heat source *** was found through theoretical analysis results that the popular R123 is an acceptable choice especially for the utilization of closed type heat *** it will be phased out in near future,then cis-butene,butane,trans-butene,and isobutene are worth studying as its *** is worthy of attention and further research and it can be a good choice for utilization of open type heat source.

关键词： dry fluid isentropic fluid turning point saturated vapor curve near-critical region triangle Organic Rankine Cycle

An efficient analytical decomposition and numerical procedure for boundary layer flow on a continuous stretching surface

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Journal of University of Science and Technology Beijing 2006年第5期13卷 401-405页

作者： Xuehui Chen Liancun Zheng xinxin zhang Mechanical Engineering School University of Science and Technology Beijing Beijing 100083 China Applied Science School University of Science and Technology Beijing Beijing 100083 China

An efficient Adomian analytical decomposition technique for studying the momentum and heat boundary layer equations with exponentially stretching surface conditions was presented and an approximate analytical solution was obtained, which can be represented in terms of a rapid convergent power series with elegantly computable terms. The reliability and efficiency of the approximate solution were verified using numerical solutions in the literature. The approximate solution can be successfully applied to provide the values of skin friction and the temperature gradient coefficient.

关键词： momentum heat transfer stretching surface decomposition technique analytical approximation