一种基于蜡质自组装的疏水涂层制备方法

用氯仿从荷叶表面提取蜡质,氯仿挥发后蜡质能够在载玻片上自组装形成疏水涂层。扫描电镜观察表明,荷叶蜡质自组装形成的微观结构与新鲜荷叶表面纳米级的管状结构非常类似;静态接触角测试表明,载玻片上的蜡质涂层接触角高达138°±5°;GC-MS分析表明,荷叶蜡质成分主要为长链脂肪烃、脂肪醇、脂肪酸、脂和少量酮。这种疏水表面原则上能按照荷叶蜡质成分及其含量比例关系溶解混合工业原料得到。     

光敏性有机硅丙烯酸酯的合成及其改性紫外光固化材料研究

以Karstedt催化荆,催化端氢硅油(DHPS)和三缩丙二醇二丙烯酸酯(TPGDA)的硅氢加成反应,合成光敏性有机硅丙烯酸酯(SA).反应产物用红外光谱和紫外一可见光谱进行了表征,将不同比例的有机硅丙烯酸酯作为活性稀释剂添加到光固化体系中,考察了配方分别在空气和N2中的光固化性能,利用扫描电镜观察了光固化膜的表面形貌,研究了SA对光固化材料机械性能、热稳定性以及化学稳定性的影响.结果表明,氧阻聚作用对于SA配方比较明显,能显著降低其固化速率;SA对光固化膜物理化学性能有一定影响,含有5%SA的光固化材料综合性能优异,超过此含量,光固化材料机械和化学稳定性随着SA含量的增加反而降低;热重分析表明,SA能提高体系的热稳定性.     

外墙外保温工程漏水问题分析与对策

本文从外保温系统材料、设计、施工等方面分析了外保温工程出现漏水的原因,并提出相应对策。     

Identification of system vulnerabilities in the Ethiopian electric power system

The Ethiopian Electric Power(EEP) has been operating and managing the national interconnected power system with dispersed and geographically isolated generators, a complex transmission system and loads. In recent years, with an increasing load demand due to rural electrification and industrialization, the Ethiopian power system has faced more frequent, widely spread and long lasting blackouts. To slash the occurrence of such incidents, identifying the system vulnerabilities is the first step in this direction. In this paper, the vulnerability assessment is performed using indices called active power performance index(PIp) and voltage performance index(PIv). These indices provide a direct means of comparing the relative severity of the different line outages on the system loads and voltage profiles. Accordingly, it is found that the most severe line outages are those lines that interconnect the high load centered(Addis Ababa and Central regions) with the rest of the regional power systems. In addition, the most vulnerable buses of the network in respect of voltage limit violations are mainly found at the high load centers.     

用于外墙外保温体系中的玻璃纤维网格布

玻璃纤维网格布在外保温体系中起到应力分散的作用，与抹面胶浆一起共同组成外保温体系的防护面层，抵抗自然界温、湿度变化及意外撞击所引起的面层开裂。玻璃纤维网格布的性能如何，与抹面胶浆的相容性如何，也是外保温体系抗开裂必须要讨论的一个问题。１抗断强度及耐碱强度保留率一般都知道抗断强度及耐碱强度保留率是玻纤网格布的重要性能。抗断强度与玻璃纤维支数或重量密不可分。目前我国市场上用于外墙外保温体系的玻纤网格布每平方米重量一般都在１３０g左右，强度普遍偏低，其常态抗断强度只有１０００N／５cm左右。而在外墙外保…     

外墙外保温体系使用锚栓的问题

本文在分析外墙外保温体系的性能、受力状况的基础上，探讨了粘胶和锚栓在外墙外保温体系中的适用性和条件。     

木质素磺酸盐接枝共聚物（CT3—11）的研究与应用

本文叙述了降粘剂ＣＴ３－１１的室内研究,中试生产及现场试验内容。ＣＴ３－１１是一种含有机阳离子、阴离子基团的木质素磺酸盐接枝共聚物。它适用于不同类型和不同密度范围的钻井液体系,同时,增加钻井液的抑制性能。试验表明,ＣＴ３－１１具有抗温、抗污染能力。     

香味盐水豆的制备工艺

制备了一种香味盐水豆，并对其进行破坏性实验研究，结果表明引起这种香味盐水豆变质的菌种主要的大肠菌群和葡萄球菌，并成功地解决了该食品的防腐变质问题。     

Alterations in reverse cholesterol transport associated with programmable implantable intraperitoneal insulin delivery

OBJECTIVE: As the population ages, the care of older persons becomes more important. At the same time, practice guidelines that provide recommendations for appropriate care are being published in greater numbers. The purpose of this work is to determine the proportion of guidelines that contain specific information about older persons. DESIGN: Through a random sample of published guidelines listed in the AMA Directory of Practice Parameters, 1992 Edition, we determined the proportion of guidelines that contain specific age-related information. We also determined if, over time, there was a difference in the proportion of practice guidelines containing information about older persons. RESULTS: 45.9% (95% CI, range 33.4-58.4) of guidelines that could conceivably pertain to older persons contain no age information; 24.6% (95% CI, range 13.8-35.4) of guidelines contain information only about persons less than 65 years of age; 29.5% (95% CI, range 18.1-41.0) of guidelines contain specific information about older persons. Moreover, there were no secular trends in the proportion of guidelines pertaining to older persons. CONCLUSIONS: Only a minority of practice guidelines contain information about older persons. Possible causes and solutions to this shortfall are discussed.     

The influence of apolipoprotein e genotype on visuospatial attention dissipates after age 80.

Although it is established that apolipoprotein E (APOE) e4 allele increases the risk of Alzheimer's disease (AD), epidemiological studies indicate that genetic risk decreases late in life. This raises the question of whether the effects of APOE on cognition that are seen in midlife arise from a cognitive phenotype of APOE or from the presence of early AD in some APOE-e4 carriers. The authors addressed this question by comparing the cognitive consequences of variation in the APOE gene between individuals over the age of 80 (old-old) and middle-aged and young-old individuals. A spatially cued discrimination paradigm--previously shown to be sensitive to AD and to APOE genotype--required a speeded categorization of a target letter following cues that were valid, invalid, or neutral in predicting target location. Results revealed greater costs of invalid cues in the APOE-e4 carriers of middle-aged and young-old, but not old-old, groups. The dissipation of the APOE effect in old-old individuals at lower risk of AD suggests that visuospatial attention impairments seen as early as midlife in APOE-e4 carriers may be a preclinical marker of AD. (PsycINFO Database Record (c) 2010 APA, all rights reserved)