137 research outputs found

    The preliminary study on the bioassay of Dioxin-like compounds

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    二噁英类化合物(Dioxin-likecompounds)是典型的持久性有机污染物,它们对生物体具有强致癌、内分泌干扰、肝毒性、免疫毒性、皮肤毒性、生育障碍等健康威胁,因此对它们的监控就显得极为重要。目前对二噁英类化合物的分析方法多种多样,但总的来说可以把它们归结为仪器分析法和生物分析法。其中仪器分析法样品前处理过程繁琐,检测周期长,检测成本昂贵,同时对检测人员的技术要求也比较高,限制了该方法在环境监测中的应用。由于二噁英类化合物具有相似的毒性机理,均能通过AhR信号通路影响cyp1a1基因的表达,因此我们设计并构建cyp1a1启动子调控GFP基因的方式,获得稳转的HepG2细胞系与转基因斑马...Dioxin-like compounds (DLCs) are typical persistent organic pollutants that have a health threat to the organism with strong carcinogenic, endocrine disrupting, hepatotoxicity, immunotoxicity, skin toxicity, and fertility disorders, so monitoring them is extremely important. At present, there are many analytical methods of dioxin like compounds, but they can be summed up as instrumental analysis a...学位:理学硕士院系专业:生命科学学院_生物化学与分子生物学学号:2162014115257

    1984 Vol. 33 No. 3

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    https://engagedscholarship.csuohio.edu/lawpublications_gavel1980s/1009/thumbnail.jp

    A design of high precision and high power electroplating power source

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    针对传统电镀电源体积大、实现方式复杂以及输出纹波大的特点,提出了一种新型的dC/dC变换器,采用双闭环PWM实时控制方式,具有恒电流和恒电压两种工作方式。用该方法设计了一组9.6 kW电源模块,实验表明,电源输出纹波系数小于1%,效率达到90%。The tradition electroplating power is large and the output ripple is big.This paper provides a circuit scheme that use high-frequency switch power supply.The double close-loop PWM control is adopted in control circuit.The power supply has two kinds of working patter,which are constant current mode and constant voltage mode.A group of 9.6 KW power supply module are designed.According to the experiments,the power output ripple coefficient is less than 1%,and the efficiency is 90%.厦门市科技计划项目(3502Z20123013

    Material and Energy Conversion of Integrated 100,t/a-Scale Bio-Jet Fuel-Range Hydrocarbon Production System via Aqueous Conversion of Biomass

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    以农业废弃物生物质为原料,利用水相转化技术,进行了百吨/年规模生物航油类烃(C8~C15)合成试运行.过程中采用两步酸解法分别将玉米秸秆中半纤维素和纤维素转化为糠醛和乙酰丙酸,作为生物质基平台化合物.在碱性条件下糠醛与乙酰丙酸经Aldol缩合反应实现碳链增长,生成的长链含氧中间体经过低温预加氢、高温加氢脱氧及精制,生成C8~C15范围内液态烃,可作为生物航油组分.以试运行实验结果为基础,进行了过程的物质与能量转化分析.结果表明,该路线获得液态烃类的基本性质满足合成航油ASTM-7566标准要求,并充分利用了原料中纤维素和半纤维素组分,是一条基于生物质的长链液态烃合成路线,1t航油约需10~12t干基玉米秸秆

    第十八届美国理论与应用力学大会总结

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    1会议概况2018年6月5—9日,第18届美国理论与应用力学大会(18th U.S. National Congress of Theoretical and Applied Mechanics, USNCTAM2018)在美国芝加哥召开.本次大会由美国力学国家委员会和中国力学学会联合主办,旨在探讨和交流近四年世界范围内在理论和应用力学领域的基础研究、创新技术的最新进展,吸引了来自世界各地的近千名专家学

    生物质转化为高品位烃类燃料研究进展

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    The research progresses in conversion of all-components of biomass to high-valued hydrocarbons (gasoline and jet fuel) were summarized. In the upgrading of bio-oil, the research progress for olefins and aromatics production via catalytic cracking of bio-

    Progress in Production of High-quality Hydrocarbon Fuels from Biomass

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    The research progresses in conversion of all-components of biomass to high-valued hydrocarbons (gasoline and jet fuel) were summarized. In the upgrading of bio-oil, the research progress for olefins and aromatics production via catalytic cracking of bio-

    Anti-scourability of Soil under Different Land Use Types

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    &nbsp;采用野外实地放水冲刷的试验方法,对岷江上游干旱河谷区龙坝沟流域不同土地利用方式(灌木林地、荒草地、耕地和裸地)下土壤抗冲性进行测试研究,分析了土壤侵蚀产沙相关因素。结果表明:不同土地利用方式下土壤抗冲系数均随冲刷时间延长呈波状上升变化趋势;土壤的抗冲性从大到小依次为:荒草地、小麦耕地、灌木林地、玉米耕地、裸地;土壤抗冲系数与粉粒体积分数呈显著负相关(相关系数为-0.992,P&lt;0.01),与砂粒体积分数呈显著正相关(相关系数为0.925,P&lt;0.01)。 更多还原<br /

    融合视角下的西方创造力系统观

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    创造力研究领域的学者已经在大C创造力、小C创造力以及创造力过程、人格、产品、创造力社会文化环境等不同角度进行了丰富的研究与理论的建构,但体系纷繁,观点各异,往往让人难以抓住问题的重点,我们则在梳理创造力定义的基础上,将西方创造力理论从两个大方向上进行一定的梳理与思考,一个是发展的角度(从微C创造力到小C创造力,再到专业C创造力,最后到大C创造力),另一个是从微观到宏观联系的角度(从创造力的认知神经基础到创造力过程&hellip;&hellip;一直到创造力的社会文化层面),组成一个既联系又发展的坐标分类图,因其与星系发展的过程有类似之处,便将其比喻为星系发展模型,以此来分析每个理论(主要包括Kaufman的4-C创造力模型、Csikszentmihalyi的创造力系统模型、Sternberg的创造力贡献推进理论、Amabile的创造力组成成分模型、Gl?veanu的5A创造力理论)的适用范围与界限,以期为深入理解各个理论,树立创造力整体观及为更进一步深入研究与应用做出一定的铺垫。&nbsp
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