热固型甲基丙烯酸酯真空浸渗剂发展概况

本文简述了真空浸渗剂的发展概况，着重介绍了其中的热固化浸渗剂及其组成和浸渗工艺。     

Association of seed size with genotypic variation in the chemical constituents of soybeans

Ten soybean genotypes grown in 1992 with seed size ranging from 7.6 to 30.3 g/100 seeds and maturity group V or VI were selected and tested for oil and protein content and for fatty acid composition. In these germplasm, protein varied from 39.5 to 50.2%, oil, 16.3 to 21.6%, and protein plus oil, 59.7 to 67.5%. Percentages of individual fatty acids relative to total fatty acids varied as follows: palmitic, 11.0 to 12.8; stearic, 3.2 to 4.7; oleic, 17.6 to 24.2; linoleic, 51.1 to 56.3 and linolenic, 6.9 to 10.0. Seed size showed no significant correlations with individual saturated fatty acids, protein or oil content. However, significant correlations were found between seed size and individual unsaturated fatty acids: positive with oleic, and negative with linoleic and linolenic. Oil and protein content were negatively correlated with each other. Among the major fatty acids, only the unsaturated were significantly correlated with each other: negative between oleic and linoleic or linolenic, and positive between linoleic and linolenic. A subsequent study with soybeans grown in 1993 generally confirmed these findings. Variation in relative percentages of unsaturated fatty acids andr values for most pairs of relationships were even higher than those obtained from the 1992 crop. Presented at the 85th AOCS Annual Meeting and Expo, Atlanta, Georgia, May 8–12, 1994.     

Al2O3-Al-C材料加热过程的变化

按w(板状刚玉)=84%,w(铝粉)=8%,w(α-Al2O3微粉)=6%,w(鳞片石墨)=2%的配比配料,外加3%热固性酚醛树脂作结合剂,成型后于200℃烘烤24h。在埋炭条件下于600～1400℃保温3h加热处理,冷却后测量试样的线变化率、显气孔率和常温耐压强度,并分析部分试样的孔径分布、相组成和显微结构,同时测定烘烤后试样在600℃、800℃、1000℃、1200℃和1400℃下的热态抗折强度,以分析该材料在加热过程的变化。结果表明,试样在600～1400℃埋炭加热过程中的变化可大致分为3个阶段:1)600～800℃,金属Al于660℃熔化,促进试样致密化,在800℃时已有少量Al4C3和AlN生成,使加热后试样的致密度和强度增大;2)800～1200℃,大量生成Al4C3和AlN,Al4C3和AlN填充在刚玉骨架结构中,试样的显气孔率进一步减小,常温耐压强度和热态抗折强度进一步增大;3)1200～1400℃,金属Al消失,Al4C3含量减少,部分与N2反应转化为AlN,试样的显气孔率略有降低,常温耐压强度和热态抗折强度略有增大。由此可见,随着加热温度的提高,材料的结合方式从碳结合转变为碳和金属铝复合结合,最后逐渐转变为碳和非氧化物复合结合。     

Clarity of blends of double-fractionated palm olein with low-erucic acid rapeseed oil

Double-fractionated palm olein (DfPOo) fractions with iodine values (IV) of 60 and 65 were each blended with low-erucic acid rapeseed (LEAR) oil in various proportions. Clarities of the blends at different temperatures were determined. Maximum levels of DfPOo-IV60 and DfPOo-IV65 in blends that remained clear at 20°C for at least 120 d were 40 and 80%, respectively. At 15°C, the maximum levels were 10 and 40%, and at 10°C, 10 and 20%, respectively. At 5°C, only a blend of 10% DfPOo-IV65 in LEAR remained clear for 120 d. Maximum levels of DfPOo-IV60 and DfPOo-IV65 in blends that passed the cold test were 30% for both palm oleins. Maximum levels of the palm oleins in blends with LEAR were higher than those of blends with soybean oil. Cloud points were lower in palm olein/LEAR blends than those of palm olein/soybean oil blends, probably because LEAR contains less saturated fatty acids than soybean oil.     

大洲高岭土矿物组成和深加工试验研究

系统介绍了大洲高岭土矿的地质概况，矿床特征，对大洲高岭土的理化性能进行了深入研究并对其进行了深加工试验研究试验结果表明：大洲高岭土是一种结晶较差的高岭石，工艺性能一般．Ｆｅ２Ｏ３含量在１．２％－２％，经深加工可降低Ｆｅ２Ｏ３含量．一般可以达到陶瓷工业用高岭土的一、二级标准，为陶瓷工业产品高档化创造了物质条件。     

硫酸锶晶体生长动力学研究

为了从控制晶体生长角度，说明制备纳米硫酸锶沉淀体系中存在的EDTA对产品粒径的影响作用，根据过程机理，用恒组成法研究硫酸锶晶体生长动力学。根据叠加模型和弱化模型，建立体系中有EDTA存在时，硫酸锶沉淀过程的晶体生长动力学模型。结果表明，硫酸锶沉淀过程中晶体生长属于表面反应控制机理。EDTA存在能降低晶体生长速率，有利于减小粉体粒径。     

“十一五”我国石油替代和再生能源部分产品发展分析

能源多元化对保障国家能源安全,紧跟世界能源发展趋势,及时转变能源发展战略的意义重大。分类讨论替代燃料,分析其发展态势和需要的支撑条件。     

The ageing Australian firefighter: an argument for age-based recruitment and fitness standards for urban fire services

Currently, there is no enforcement of physical standards within Australian fire services post-recruitment, possibly leading to inappropriate fitness and body composition. This study evaluated the impacts of ageing on physical standards of Australian firefighters. Seventy-three firefighters from three different 10-year age groups [25–34 years (n = 27), 35–44 years (n = 27), 45–54 years (n = 19)] volunteered for physical testing using dual-energy X-ray analysis and existing fitness tests used for recruitment by an Australian fire service. Older (45–54 years) participants demonstrated significantly poorer physical standards compared with younger participants including cardiovascular fitness (p < 0.05), strength (p = 0.001) and simulated operational power testing tasks (p < 0.001). Age-related body composition changes were also observed independent of body mass index. Minimum recruitment standards and fitness programs need to account for age-related declines in physical capabilities to ensure that the minimum standard is maintained regardless of age.

Practitioner Summary: Using dual-energy X-ray analysis and established fitness testing protocols, this study aimed to gain an appreciation of the current standards of body composition and fitness of Australian firefighters and the effects of ageing on their physical abilities post-recruitment. The study demonstrated a significant decline in physical standards due to age.     

Milk fat fractionation today: A review

Although anhydrous milk fat (AMF) has excellent properties, its variable physicochemical properties and its lack of functionality restrict its uses in the food industry. A technology involving dry fractionation of AMF has been developed, and its attributes include selectivity, reliability and general application. Combining two simple and reliable technologies,i.e., multi-step fractionation and blending, it is possible to overcome functionality problems and the seasonal variations of AMF. Lecture presented at the joint meeting of the International Society for Fat Research and the American Oil Chemists’ Society in Toronto, May 10, 1992.     

云母钛珠光颜料的研究

综述了云母钛珠光颜料的发展概况，介绍了它的三种类型：银白色型、虹彩型、着色型，着重论述了它的生产工艺和制备方法(气相包覆法和液相沉积法)，并比较了各类方法的优缺点，分析了它的晶型类别(板钛型、锐钛型、金红石型)、包膜的复合机理和虹彩效应形成的原因，并指出国内产品的发展方向。