纳滤技术在油田调驱配聚中的应用进展

纳滤(Nanofilitration,NF)是一种新型分离技术,对二价离子具有高截留的特性,可分离大部分油田水中的二价离子,如Ca2+、Mg2+、Ba2+、CO32-、SO42-等成垢离子.用纳滤技术处理后的注入水配聚,可减少高价离子对聚合物凝胶的影响.介绍了纳滤处理油田采出水的原理,油田采出水特性,以及纳滤软化注入水...     

Universal intervention effects on substance use among young adults mediated by delayed adolescent substance initiation.

In this article, the authors examine whether delayed substance initiation during adolescence, achieved through universal family-focused interventions conducted in middle school, can reduce problematic substance use during young adulthood. Sixth-grade students enrolled in 33 rural midwestern schools and their families were randomly assigned to 3 experimental conditions. Self-report questionnaires provided data at 7 time points for the Iowa Strengthening Families Program (ISFP), Preparing for the Drug Free Years (PDFY), and control groups through young adulthood. Five young adult substance frequency measures (drunkenness, alcohol-related problems, cigarettes, illicit drugs, and polysubstance use) were modeled as distal outcomes affected by the average level and rate of increase in substance initiation across the adolescent years in latent growth curve analyses. Results show that the models fit the data and that they were robust across outcomes and interventions, with more robust effects found for ISFP. The addition of direct intervention effects on young adult outcomes was not supported, suggesting long-term effects were primarily indirect. Relative reduction rates were calculated to quantify intervention-control differences on the estimated proportion of young adults indicating problematic substance use; they ranged from 19% to 31% for ISFP and from 9% to 16% for PDFY. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

从铅废渣制取三盐基硫酸铅的研究进展

综述了从铅废渣中制备三盐基硫酸铅的研究现状,就目前制备三盐基硫酸铅的方法：硝酸铅法、氢氧化钠法、氯化法、碳酸铵法、氧化铅法,分别作了简单的介绍,且对三盐基硫酸铅的应用前景及其发展趋势作了展望。     

A novel method for preparing LiFePO4 nanorods as a cathode material for lithium-ion power batteries

An effective method for synthesizing a one-dimensional nanostructure to improve the rate performance of LiFePO₄ as the cathode material for Li-ion power batteries is described. The crystal structure, composition, and morphology of the prepared LiFePO₄ were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM), respectively. The reaction mechanism of the LiFePO₄ nanorods is discussed herein. Electrodes consisting of the LiFePO₄ nanorods have better rate discharge capacities over a potential range of 2.5-4.2 V (vs. Li⁺/Li). These results are attributed to the shorter distance of electron transport and the fact that ion diffusion in the electrode material is limited by the nanorod radius. Our results indicate that the prepared LiFePO₄ nanorods are promising cathode materials for Li-ion power batteries. This new process for synthesizing nanorod products from nanorod raw material can be extended to the preparation of other one-dimensional materials.     

激光制备金属陶瓷复合层技术现状及展望

本文综述了近年来激光制备金属陶瓷复合层技术的发展状况,比较了各工艺的特点.     

标准混合气配制装置的研究

本文提出了一种在阻塞流动状态下精确控制纯气体流过喷咀的时间，进行高精度配制标准混合气的方法；并研制了相应智能标准气发生装置。该装置配气精度高、轻便、可靠、操作方便，可用于现场配制各种标准混合气。     

卤化银印刷制版明室片性能及制备技术

对“华光”GLR-Ⅱ型明室片的性能进行了测试，与特硬正色片进行了网点成像对比实验，并对卤化银明室片在制备技术上的独特之处进行了分析讨论。     

工程量清单计价模式对招投标影响的探讨

工程量清单计价与定额计价的根本差异并非计价方法不同而是采购对象的性质不同,前者是工程零部件产品而后者是施工工艺,因此清单计价能有效控制工程造价而定额计价难以控制工程造价。     

密封锌镍蓄电池负极制作和性能研究

探讨了用于密封锌镍蓄电池负极的粘结式锌电板的制作工艺;对采用不同几何尺寸和粘结剂用量、不同纤维化程度的锌电极进行了性能测试;采用循环伏安技术对锌电极在所使用的电解液（被ZnO饱和的KOH－KF－K2CO3溶液）中的稳定性进行了评价;本实验制作的锌电极与烧结式镍电极组成模拟AA型蓄电池的比能量高达250W·h／L。     

富勒烯C60的制备研究Ⅰ最佳制备条件的确定

以石墨、煤基炭为原料,电弧法制备富勒烯。考察了富勒烯的最佳制备条件,并对电弧蒸发下富勒烯的形成机理进行了讨论。实验结果表明,在电弧法制备富勒烯的过程中,一个适宜的温度场分布对于提高富勒烯的产率是很重要的,在本实验条件下,富勒烯的最佳制备条件为：氦气压力Ｐ＝ ０．０１８ ＭＰａ～０．０２ ＭＰａ,直流电流强度Ｉ＝ ８０ Ａ～１００ Ａ。