舰船燃气轮机电子控制柜设计特点的分析

针对引进的某型舰船燃气轮机电子控制柜,分析了其功能和结构特点,讨论了设计原理,分析了设计特点。     

600MW等级超临界汽轮机的设计开发

分析了600MW等级超临界汽轮机的结构特点,阐述了机组的滑销系统和启动特点等,总结了超临界汽轮机的总体特点,并对改进和创新的一系列机组进行了论述。本文的研究表明,该等级汽轮机的整体性能已达到国际先进水平。     

小立柱马腿成形模设计

介绍了不锈钢车小立柱的特点,分析了小立柱马腿成形的工艺方法,阐述了小立柱马腿成形模结构特点.     

煤泥循环流化床锅炉技术特点分析

分析了煤泥的特点 ,结合循环流化床技术 ,指出了纯烧煤泥的可行性及循环流化床锅炉的结构特点     

压气机的湿压缩特性及计算模型初步研究

在大量分析国外有关的压气机通流部分喷水的资料基础上,根据已取得的初步实验结果,总结了喷水后压气机性能的主要特点及影响性能的关键因素,从理论上对这些特点进行了分析论证。最后根据“湿压缩”的特点,提出了一种计算模型。     

水性醇酸树脂涂料在严寒地区电站锅炉的应用

介绍了水性醇酸树脂涂料的发展历程及水性醇酸树脂的主要分类及特点。根据锅炉产品的特点及防锈要求,论证了水性醇酸树脂在锅炉产品应用的可行性及应用范围,并提出水性漆在严寒地区的施工工艺特点及注意事项。     

一台100t/h高压饱和水煤浆锅炉的设计

介绍了一台石化企业用100 t/h高压饱和蒸汽水煤浆锅炉的设计特点,重点阐述了该锅炉的运行特点和水煤浆燃料特点对锅炉关键数据的选取、锅炉结构及燃烧器布置等方面的影响。     

一种带过热器的SZS型锅炉结构设计

简述了SZS型燃气水管锅炉的结构特点,针对其过热器的结构布置进行了分析比较,并介绍了一种新型过热器布置方案及特点.     

某电厂660MW超临界锅炉设计

介绍了某电厂660WM超临界锅炉的设计方案,设计特点和结构特点。     

半导体制冷技术刍议

文中介绍了制冷系统的新分支半导体制冷技术的工作原理和特点,并根据其应用特点和适用场合,展望了其市场发展前景。     

自然通风技术研究方法及工具

目前自然通风主要有三种研究方法:简单的理论分析法、实验法和数值模拟法。本文概括介绍了后两种方法的研究现状,并对它们进行了分析比较,提出各种方法的适用场合。在数值模拟法中还介绍了几种可用于分析自然通风系统的通风特性和热特性的常用工具软件,对各自工作原理和应用特点进行了比较,并对使用方法和应用场合提出了建议。     

Potential method in the theory of thermoviscoelastic mixtures

In this article, the linear theory of binary thermoviscoelastic mixtures is considered and the basic boundary value problems (BVPs) of steady vibrations are investigated. Namely, the fundamental solution of the system of equations of steady vibrations is constructed explicitly and its basic properties are established. Green’s second and third identities are obtained and the uniqueness theorems for classical solutions of the internal and external basic BVPs of steady vibrations are proved. The surface and volume potentials are constructed and their basic properties are given. The determinants of symbolic matrices are calculated explicitly. The BVPs are reduced to the always solvable singular integral equations for which Fredholm’s theorems are valid. Finally, the existence theorems for classical solutions of the internal and external BVPs of steady vibrations are proved by the potential method and the theory of singular integral equations.     

Study of contact melting inside isothermally heated vertical cylindrical capsules

Close-contact melting processes of phase change material (PCM) inside vertical cylindrical capsule are studied. PCM are heated by the capsule isothermally at the bottom and side. The theoretical formulas of the melting rate and thickness of liquid layer during the heat transfer process are obtained by analysis, which are convenient for engineering predictions. Finally, the factors that affect melting are discussed, and conclusions are drawn.     

US nuclear energy policy Provision of funds for decommissioning

The five recognized methods of decommissioning nuclear power plants are reviewed, and are linked with US nuclear regulatory policy. Although over 60 US nuclear reactors have been decommissioned since 1960, none have been large-scale commercial facilities. Costs of the decommissioning alternatives are estimated, but are acknowledged to be highly tentative and uncertain. Five methods of providing funds for decommissioning and the actual practices of US electric utilities are analysed in terms of the policy issues they present. Revenue bonding and sinking fund approaches are argued to be the soundest means to recover decomissioning uncertainties surrounding decommissioning are considered.     

质子交换膜燃料电池系统控制与应用现状

描述了质子交换膜燃料电池(PEMFC)系统的控制及其在中低功率领域中的应用现状。首先概述了过程模型和电压预测模型，对影响电堆性能的各参数进行分析。其次，从目前运用的简单控制方法、混合动力驱动、效率优化、故障容许等方面对PEMFC系统的分析与控制结构作了说明。然后介绍了PEMFC的几种具体应用。最后结合国内外的相关研究进展，提出了一些有待进一步研究的方向。     

无心感应熔铜、铝炉用耐火材料

介绍了熔炼铜、铝及其各自合金的无心感应炉用新型干式成型耐火材料的研制、性能和使用情况。该材料成本低,成型工艺简便,使用寿命长。     

Stochastic approach for daily solar radiation modeling

Mathematical modeling of solar radiation continues to be an important issue in renewable energy applications. In general, existing models are mostly empirical and data dependent. In this paper, a novel approach for solar radiation modeling is proposed and illustrated. The proposed application consists of hidden Markov processes, which are widely used in various signal processing topics including speech modeling with successful results. In the experimental work, mean of hourly measured ambient temperature values are considered as observations of the model, whereas mean of hourly solar radiation values are considered as the hidden events, which constitute the outcomes of the proposed mathematical model. Both solar radiations and temperatures are converted to quantized number of states. Finally, after a training stage that forms the transition probability values of the described states, the hidden Markov model parameters are obtained and tested. The tests are repeated for various numbers of states and observations are presented. Plausible modeling results with distinct properties in terms of accuracy are achieved.     

开放空气环境中的池火灾及其危险性分析

本文涉及开放空气环境中池火灾及其危险性分析，对池火灾的如下物理特征进行了总结；（１）火焰的几何形状及尺寸；（２）火焰表面的热辐射通量；（３）热辐射的传播，文中并归纳了热辐射的各种破坏准则，推导了进行池火灾危险性分析的程序和算法，通过数值模拟计算，讨论了一些重要规律。     

A review on ports’ readiness to facilitate international hydrogen trade

The existing literature on the hydrogen supply chains has knowledge gaps. Most studies focus on hydrogen production, storage, transport, and utilisation but neglect ports which are nexuses in the supply chains. To fill the gap, this paper focuses on ports' readiness for the upcoming hydrogen international trade. Potential hydrogen exporting and importing ports are screened. Ports' readiness for hydrogen export and import are reviewed from perspectives of infrastructure, risk management, public acceptance, regulations and standards, and education and training. The main findings are: (1) liquid hydrogen, ammonia, methanol, and LOHCs are suitable forms for hydrogen international trade; (2) twenty ports are identified that could be first movers; among them, twelve are exporting ports, and eight are importing ports; (3) ports’ readiness for hydrogen international trade is still in its infancy, and the infrastructure construction or renovation, risk management measures, establishment of regulations and standards, education and training all require further efforts.     

Heat transfer performance of a double-loop separate-type heat pipe: Measurement results

An experimental study is presented for the heat transfer performance of a rectangular double-loop natural circulation system, in which the condensers are made of double tubes with water-steam as the working fluid. Detailed temperature measurements of the core fluid and the wall are made, from which overall heat transfer coefficients for the evaporator, condensers, and entire system are obtained. Parametric studies of the liquid charge level, fluid properties, and heating or cooling conditions on the heat transfer performance are presented and correlation equations are given. The results show that the overall heat transfer coefficients for the evaporator, condensers, and entire loop are all increasing with decreasing liquid charge level. Overhead phenomena at low liquid charge level and thermal oscillation at some situations are also observed and discussed.