《<髹饰录>解说》辨正

本文对<<髹饰录>解说>所解说的漆工艺提出商榷并试作辨正,以就教于海内外方家.     

<投资项目可行性研究指南>中经济评价的新要求

介绍<投资项目可行性研究指南>中编制经济评价部分的一些新要求.     

碳酸丙烯酯（PC）脱碳填料塔的工艺结构计算

利用<年产4×104t合成氨碳酸丙烯酯(PC)脱碳填料塔的物热衡算>和<年产4×104t合成氨PC吸收CO2传质系数的简化计算之我见>的结果,对脱碳塔的工艺结构进行设计,以给出合理的工艺结构尺寸,其处理方法对现运行的设备进行核算或改造具有实际的指导意义.     

关于办好《超硬材料工程》期刊的几点思考

超硬材料行业是一个快速发展、前景光明的行业;以服务整个行业为宗旨的<超硬材料工程>杂志存在着机遇和挑战.文章从<超硬材料工程>的办刊宗旨出发,结合行业的发展现状和未来,提出了办好期刊的一些观点和方法;认为办刊应该坚持质量至上的原则,注重个性发展,加强制度管理和编辑队伍建设,把期刊办成具有行业特色,专业性、先进性和可读性相结合的优秀期刊.     

Ba-,Sr-基A(B′1/3B″2/3)O3型复合钙钛矿化合物的结构(上)有序行为及理论研究

比较全面地介绍了A(B′1/3B″2/3)O3型复合钙钛矿系化合物的有序结构及其对介电性能的影响,阐明了12长程有序、11短程有序形成的机理及其特征.12有序是B′与B"离子以"B′B"B"…"的比例沿<111>方向交替排列;而11有序是B′和B"离子沿<111>方向呈11层状交替排列,一般认为B位离子形成(B′2/3B"1/3)1/2B"1/2为11的混合型有序排列,即沿<111>方向,(B′2/3B"1/3)1/2和B"1/2呈相间层状排列;长程有序和短程有序可同时存在并在一定条件下相互转化.介绍了对A(B′1/3B"2/3)O3型复合钙钛矿系化合物有序结构的理论研究成果静电模型和第一性原理.     

压力容器冷成形与热处理的界定

本文根据<压力容器安全技术监察规程>和GB150-1998<钢制压力容器>对压力容器冷加工成形的热处理要求,参照ASME最新版锅炉压力容器规范对这方面的规定作一综述,供同行在解决这方面问题时的参考.     

绿色染化料的开发和应用(二)

绿色染化料的开发不仅适应生态环保持续经济的需要,也是符合染化料新功能的要求.该文罗列了近年国内外新开发的大量染料和印染助剂,特别是活性、分散、直接、酸性染料的新品种,披露了它们的分子结构式,大部份是在<染料索引>尚未刊登的,也是鲜为人知的.它们都是绿色和高功能的,光分解和应用这些新开发的染化料同时是为对应绿色技术壁垒所必需的.     

对改进投资项目评估工作的建议

为适应我国入世后的新形势 , 对修订 < 建设项目经济评价方法与参数 > 和建立可行性研究与项目评估新机制提出一些建议和设想 .     

绿色染化料的开发和应用(一)

绿色染化料的开发不仅适应生态环保持续经济的需要,也是符合染化料新功能的要求.该文罗列了近年国内外新开发的大量染料和印染助剂,特别是活性、分散、直接、酸性染料的新品种,披露了它们的分子结构式,大部份是在<染料索引>尚未刊登的,也是鲜为人知的.它们都是绿色和高功能的,光分子解和应用这些新开发的染化料同时是为对应绿色技术壁垒所必需的.     

弹簧管式一般压力表、压力真空表及真空表示值误差测量不确定度的评定

本文根据JJF1059-1999<测量不确定度评定与表示>的要求,依据JJG52-1999<弹簧管式一般压力表、压力真空表及真空表检定规程>,对弹簧管式一般压力表示值误差的测量不确定度进行分析.通过对A、B两类测量不确定度的具体分析与计算,得出弹簧管式一般压力表、压力真空表及真空表示值误差测量不确定度的数值.     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

聚酰亚胺的合成法

本文评述了缩聚型聚酰亚胺的主要合成方法和近年来国际上在合成中所做的探索。