Structure and processability of iodinated poly(vinyl alcohol). IV. Drawability of the films iodinated at solution before casting

The drawability of iodinated at solution before casting (IBC) polyvinyl alcohol films prepared by casting aqueous solutions of 10 wt % PVA containing 15.2, 39.8, 83.2, 117.0, and 140.1% was examined with a tensile tester at 20–60°C. The tensile behavior of IBC films showed that the yield and breaking loads were much lower, and the breaking elongation was even higher than those of the unoriented iodinated after casting (IAC) films as well as the untreated PVA films. The maximum draw ratios of the films with the weight gain of 15.2, 39.8, 83.2, 117, and 140.1% were 4.5, 5.5, 8.5, 8.0, and 7.5, respectively, which were achieved at 20°C in all. The crystallinity of all films increased by the maximum draw, regardless of crystallinity before drawing. The crystalline structure was recovered to the original PVA crystalline lattice by deiodination. Amorphous orientation and initial moduli increased with the maximum draw ratio, while the orientation of crystals was constant. The orientation and moduli increased up to the weight gain of 83.2%, whose highest draw ratio and initial modulus were 8.5 and of 7.1 GPa, respectively, and then decreased. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

某硅线石矿石选别中除铁研究

针对矿石中硅线石微细嵌布，铁矿物嵌布亦较细。且有近二分之一铁在非金属矿物晶格之中，除铁难的特点，通过试验研究对比采用一段磨矿磁选除铁后磁尾浮选富集硅线石．浮选精矿再磨后酸浸再除铁的工艺方法，获得了理想的除铁效果，使硅线石精矿质量达到较高品质。     

浅析铂钯精矿的提取技术

本文简述湿法工艺提取铂钯金属精矿的工艺技术及主要生产过程     

Individuation, peers, and adolescent alcohol use: A latent growth analysis.

The study used latent growth modeling to investigate longitudinal relationships between individuation, peer alcohol use, and adolescent alcohol use among African American, Mexican American, and non-Hispanic White adolescents (N=6,048) from 7th, 8th, and 9th grades over a 3-year period. Initial levels of peer alcohol use were significantly related to changes in adolescents' alcohol use, whereas initial adolescent alcohol use also significantly related to changes in peers' alcohol use, suggesting a bidirectional relationship. Higher levels of intergenerational individuation were related to smaller increases in adolescent alcohol use and higher levels of separation were related to larger increases in youth drinking. The findings were similar across ethnic groups. Implications for development of prevention and intervention programs are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

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研究燃料汽车及其氢源系统是当今国内外能源工业与汽车工业的共同课题，而优选制氢能源则是这一课题的关键。章介绍了利用能源、经济、环境(EEE)——生命周期评估(LCA)这一综合评估方法，针对以天然气、煤或石油作为制氢能源的多种燃料电池氢源供应方式以及配套的燃料电池汽车系统，从经济性、能源利用效率和环境影响三个方面进行了生命周期清单分析和EEE综合评价。结果显示：天然气作为发展燃料电池汽车氢源的一次能源，具有氢制取技术路线多样化、经济上竞争力强、能源利用效率高和环境效益好等诸多优势，应为燃料电池汽车的首选制氢能源。对这一评估模型的敏感性分析显示，即使在天然气价格波动较大时，天然气制甲醇--甲醇车载重整车和天然气制氢--纯氢车这两个方案仍然最具优势。     

The effects of soaking of whole, dehulled and ground millet and soybean seeds on phytate degradation and Phy/Fe and Phy/Zn molar ratios

The degradation and leaching of phytates, phytase activity and iron and zinc concentrations have been studied after soaking of whole seeds, dehulled seeds and flours of millet and soybean, in order to investigate the efficiency of soaking on reducing Phy/Fe and Phy/Zn molar ratios. When using millet grains, dehulling and milling before soaking facilitated the leaching of phytates and phytases in the aqueous medium and hence phytate degradation. Dehulling of soybean seeds led to a marked increase in phytate content, whereas milling favoured reactions between phytases and phytates. The Phy/Fe and Phy/Zn molar ratios decreased only slightly during soaking. The highest decreases for millet were obtained after soaking of flour for 8 h (Phy/Fe: 10.8–7.7 and Phy/Zn: 20.3–15.1), and after soaking of whole seeds for 24 h for soybean (Phy/Fe: 10.4–9.4 and Phy/Zn: 23.8–19.1). Cooking of flours with water used for soaking did not increase phytate degradation.     

A Daily Diary Validity Test of Drinking to Cope Measures.

Data from 2 daily diary studies of stress, negative affect, and drinking were used to examine the correspondence between global self-reports of drinking to cope (DTC) and within-person stress/negative affect-drinking associations. In Study 1, 83 community-residing drinkers recorded data in nightly booklets on negative events, perceived stress, negative affect, and drinking for 60 consecutive days. In Study 2, 88 community-residing drinkers recorded data on negative events and negative interpersonal exchanges nightly and negative affect and drinking in near-real time on palmtop computers for 30 consecutive days. Both studies showed only modest correspondence between self-reported DTC and between-person differences in within-day, daily, and weekly associations between stress/negative affect and drinking. The findings indicate that individuals who report higher DTC simply may drink across a wider variety of conditions than those who report relatively lower DTC. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

辉锑矿矿浆电解浸出机理的研究

研究了辉锑矿矿浆电解阳极室浸出反应机理．结果表明，辉锑矿的溶解符合核收缩模型的动力学规律，浸出速率受混合过程控制，表观活化能为25.10KJ/mol．浸出主反应是辉锑矿被阳极上析出的氯氧化，SCl2是氧化反应的中间产物．     

镇沅金精矿选择性固砷焙烧—氰化浸出新工艺研究

对云南镇沅金矿的难当金精矿进行了选择性固砷焙烧－氰化浸出的试验研究，取得了满意结果。砷固定率大于９２％，硫挥发率为７８％－８４％，金浸出率可达９１％－９３％。选择性固砷焙烧－氰化浸出新工艺可有效消除砷害，综合利用有价成分硫，特别适宜于含砷高硫，同时含碳等杂质的细粒浸染型难浸金矿石的处理，在我国有较大的发展前景。