低压省煤器经济性对比试验研究

对机组大修中增加的低压省煤器进行热力性能试验,在200 MW工况下分别进行了低压省煤器的投入和切除对比试验,分析其对机组经济性的影响。试验结果显示,热耗率由8 501.9 kJ/kWh降低至8 365.7 kJ/kWh,降低了136.2 kJ/kWh,试验对比性强,为电厂的相关技术改造提供参考。     

Solid Fat Content Estimation by Differential Scanning Calorimetry: Prior Treatment and Proposed Correction

The objective of this work was to develop a corrected method for solid fat content estimation by differential scanning calorimetry (DSC), as important differences are usually observed between the results given by DSC and pulsed nuclear magnetic resonance (NMR). Cold storage after full melting of fats was necessary to avoid the appearance of exothermic peaks in the modulated temperature DSC thermograms, in order to make an appropriate estimation of melting energy. Different fats were analyzed by NMR and DSC, obtaining considerably higher solid fat content values with the latter, uncorrected method. These differences were attributed to the fact that consumed energy per unit of melted mass tends to increase with the increase of the melting temperature of each fraction of the fats. A linear correlation between melting enthalpy and melting point of different triglycerides was used to estimate the energy per unit of mass consumed at each temperature. From these data, an estimated transformation of melting energy into melted mass was performed and new solid fat content values were calculated. The results obtained from this correction were much closer to the measurements made by NMR, in comparison to the uncorrected DSC method.     

东京电力公司采用特高压输电技术的论证经过

东京电力公司(Tokyo Electric Power Company,TEPCO)在20世纪90年代建成了1000kV南北输电线路和1000kV东西输电线路.文中介绍了日本选择特高压输电技术的经过和TEPCO采用特高压输电的必要性,指出了选择特高压交流最高运行电压时应考虑的因素;还对交流输电方式和直流输电方式进行了比较,分析了直流输电方式存在的问题,说明了TEPCO在特高压输电中采用交流输电方式的原因.对中国发展特高压输电有一定的借鉴意义.     

两种乳化沥青蒸发残留物含量测定法的比较

ASTM D244-2000中的《蒸发残留物》试验法和现行的SH／T0099.4-1992《乳化沥青蒸发残留物测定法》是两种不同的乳化沥青蒸发残留物含量测定法,从试样量、精密度、残留物含量测定值、残留物性质及试验操作难易程度等方面对两者进行了比对研究。     

Experimental evaluation of insulation material in roofing system under tropical climate

The objective of this study is to determine the influence of radiant barriers on conductive and radiative heat transfers when they are integrated to a building envelope and to compare their efficiency to traditional insulation material (mineral wools, polystyrene). It is also about determining which insulation material and process can lead to a better heat flux reduction through a building roof. For this study four identical small-scale test cells were used. Their respective roof was equipped with the insulation material to be tested: One with polystyrene, the second with a radiant barrier the third one with fibber glass and the last one with no insulation material was considered as the reference cell. Different test were performed with a view to evaluate the influence of parameters such as roof absorptivity and roof air layer ventilation on the heat flux reduction through the roof. With the measured temperature, the conductive and radiative heat fluxes were calculated. With a white corrugated iron roof top the heat flux reduction provided by the radiant barrier is 37%. With a black one this material allows a reduction of 33%. It is shown that whatever the roof absorptivity value, the radiative heat flux is predominant over the conductive one. With no ventilation, the radiant barrier is comparable to polystyrene and fiber glass; when the airspace is ventilated the radiant barrier provides a better insulation.     

关于油气储量翻译的建议

随着我国油气工业的国际交往日益增加，以及海外油气勘探开发作业的范围和领域不断扩大，专业翻译作为国际交往的工具，其重要性是不言而喻的。过去由于我国的储量分类标准与西方国家的储量分类标准有较大的差异，因而在各类储量的翻译上常常会造成很大的误解，影响了国际交往的顺利进行。我国新颁布的储量分类标准（GB/T 19492-2004）对原来的分类标准进行了修改，并增加了与国际接轨的储量分类的内容。这无疑有利于石油工业的国际交往。鉴于目前我国的储量分类标准尚未完全与国际接轨，根据我国各类储量的定义和西方国家的定义，将大体相同的类别对应起来，而对我国特有的类别，也提出了我们的翻译建议。目的是使这些术语能尽量反映所对应类别的内涵，而不至与其他类别混淆，引起误解。     

噪声温度法测量微波波导器件小衰减的进一步研究

本文在噪声温度法测量小衰减的基础上，提出了Ｙ因子法和噪声温度比较法测量微波波导器件小衰减的两种新设想。     

Cl2,ClO2用作冷却水系统杀生剂的比较

对工业冷却水在碱性条件下运行，用氯和二氧化氯作冷却水系统杀生剂各自的特点及使用实例作了详细比较，说明后者取代前者具有很多优越性。     

秦山第三核电厂应急干预水平的估算与探讨

根据有关文献介绍的干预水平估算方法，结合秦山地区的社会、经济等因素，对秦山第三核电厂在核事故工况下的干预水平进行了估算，并与秦山地区及IAEA推荐的干预水平进行了比较，从比较的结果可见，本文的估算结果低于秦山地区给出的干预水平，说明估算结果是偏安全的。与IAEA推荐的干预水平基本相同，说明估算结果是可信的。     

气缸孔两种激光表面处理加工技术的比较

本文简要介绍了激光淬火技术和激光珩磨技术,并从耐磨延寿机理、主要技术要素、处理加工工艺以及应用 效能等方面对它们进行了比较研究,结果表明两者是不同的激光表面处理加工方法。