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51.
选用表面活性剂四甲基氢氧化铵(TMAOH)和十六烷基三甲基溴化铵(CTAB)为模板剂,采用水热晶化法合成了镧硅磷酸铝分子筛(LaSAPO),用XRD技术考察了晶化温度、晶化时间、模板剂用量、硅铝比及体系pH值等条件对分子筛晶相的形成和产物结晶度的影响.实验结果表明:适宜的合成条件为晶化时间36h;晶化温度170℃;反应混合物的pH值范围6.0~7.0.各物质最佳摩尔比为:Al2O3∶P2O5∶SiO2∶La2O3∶CTAB∶H2O∶TMAOH=1.0∶1.0∶0.6∶0.4∶0.35∶335∶3.83. 相似文献
52.
武建强 《长安大学学报(社会科学版)》2007,9(4):72-77
社会和谐是中国特色社会主义的本质属性,而社会和谐集中体现为社会主义社会各政治关系的有效和谐。通过分析政治信任和沟通的关系及其对于建构和谐政治关系作用,分析认为:在复杂的政治关系中建立起多渠道、畅通的沟通信道,促进和巩固政治关系主体间的信任机制,进而保证社会全体人民和谐相处局面的形成。分析结果表明:只有进一步完善政治信任机制和深入拓展政治沟通渠道,才能构建良好和谐的政治生态环境。 相似文献
53.
闻明 《江汉大学学报(人文科学版)》1999,(6)
应用休克尔(Thickel)分子轨道理论对其轭分子体系的处理,通过休克尔近似,计算得到苯分子及其衍生物的分子图.并利用分子图对苯环上的取代定位经验法则进行了定量的解释. 相似文献
54.
现代生物教师的基本素质之研究 总被引:1,自引:0,他引:1
探讨现代生物教师的基本素质,首先分析现代生物教师的职业前素养准备,包括都职业意识、一般化修养、生物学专业修养以及教育学科修养等;进而讨论现代生物教师的职业中实践推进,主要从生物教师应具有的职业日常规范角度论述敬业精神;在此基础上探讨现代生物教师的职业水平提高,主要从分析教育科研的意义入手,论述探索精神对于教师职业的稳定与教学水平的提高之价值。 相似文献
55.
Claudia Springer 《Feminist Media Studies》2013,13(2):197-213
Drawing on a qualitative analysis of Swedish newspaper debates in 1979 and 1995, this article examines how Swedish newspapers refer to biological sex difference as central to drinking practices. The study shows that women are a special category of concern in debate about gender and drinking in both 1979 and 1995. Further, it shows that Swedish newspapers draw upon biology in different ways in the two years. In 1979, debate about drinking during pregnancy and Fetal Alcohol Syndrome (FAS) is central and newspapers link biomedical research on FAS to the moral idea that mothers do anything to avoid harm to children. In 1995, debate about girls' drinking habits is central and newspapers link sex hormones and neurotransmitters to the moral idea that girls shouldn't “drink like men.” These differences are discussed in the context of Swedish media interest in evolutionary psychology and biomedical solutions to alcohol problems during the 1990s. 相似文献
56.
对龟纹瓢虫PropylaeaJaponica(Thunberg)进行了田间观察和室内研究,结果表明,龟纹瓢虫在通辽地区一年发生3—4代,以成虫在土缝、作物根际、背风向阳的场所越冬。一代卵期3—4天,幼虫期7.5—11天,蛹期3.5—4天,成虫期较长。世代重叠现象严重。一次交配多次产卵,每次产卵11—22粒。其幼虫、成虫捕食性较强。成虫每昼夜捕食麦蚜76头左右,老龄幼虫每昼夜捕食麦蚜45头左右,幼虫食蚜量随湿度升高而显著增加。是蚜虫、介壳虫等很好的天敌昆虫。 相似文献
57.
以双区理论为基础 ,提出了多环芳烃的致癌性与其二阶分子连接性指数之间的定量关系方程 ,并利用该方程计算了 72个多环芳烃的致癌性 ,计算值与实验值吻合 相似文献
58.
59.
James Elder‐Woodward 《Disability & Society》2009,24(6):799-802
This article draws on the relationship between the scientific development of social biology and the political development of the British welfare system. It concludes that although the present Welfare Reform Bill is beginning to move to a state of ‘conditional altruism’, social biology has shown, mathematically, that within nature the ‘selfish gene’ can pursue its own interest through acts of true ‘unconditional altruism’. The author concludes that by concentrating on ‘the cost’ of welfare, rather than its ‘value’, the present Welfare Reform Bill has confined the British welfare state to the time frame of 19th century Utilitarianism; and treated disabled people as mere commodities of a system akin to the Poor Law. True altruism allows society to see both the intrinsic and extrinsic value of others which through cooperation and deferment enables society to develop and survive. 相似文献
60.
Direct contact with the natural world is an essential element of environmental education and a key to developing environmental
literacy and a stewardship ethic. But providing this experience can be challenging in urban environments where many people
believe nature only occurs “outside” the city, and urban biota are often unwelcome and perceived in negative terms. Since
80% of the United States’ population lives in or near urban areas, conservation educators and practitioners need to find ways
to make nature accessible to this audience, thereby creating a public who can make informed decisions about environmental
issues. Soil systems are an important, under-utilized resource for urban environmental education. Soils are ubiquitous and
thus easily accessible and their communities can be effective focal points for introducing all levels of ecology, from populations
to ecosystems. Soil and litter taxa are also intrinsically interesting, with discoveries of new species still being made in
urban areas. By studying urban soil systems, students can develop an enhanced sense of place and an appreciation of the natural
world and their connection to it thereby strengthening environmental stewardship. An important role exists for urban ecologists
to work with educators to impart enthusiasm for and to augment educators’ understanding of soil systems.
相似文献
K. M. CatleyEmail: |