64 research outputs found
黄海及渤海海峡海缆建设与海底隧道
以位于北黄海的大连—烟台海底光缆和渤海海峡诸岛间的海底光缆为例,概括介绍了它们所处的海洋环境及重要的海洋开发活动状况,从中可见它们对海底光缆的作用及影响。并着重说明海缆路由的选择及确认的过程及其重要意义。最后介绍了海底光缆与海底隧道建设之间的相似及相关性,从海底光缆建设长期的的实践中,从长期开展的海底光缆建设形成的成熟工作流程及科学的工作方法中,吸取一些可资借鉴的经验教训,为未来建设海底隧道提供一些参考和帮助
The comprehensive extraction of useful substances from Tenebrio molitor and comparison of extraction methods
比较了用石油醚和用环己烷抽提黄粉虫TenebriomolitorL .虫粉中脂肪的提取率 ,以及用碱法和用酶法提取去脂虫渣中蛋白质的提取率。并从 2种去脂、去蛋白质虫渣中和虫蜕中提取壳聚糖。用环己烷和酶法提取为最佳组合 ,可综合提取出占幼虫干重 5 0 .5 %的有效物质。同时 ,讨论了碱法和酶法提取率出现差异的原因。The fat extraction rates of the solvents light petroleum and cyclohexane, and the protein extraction rates of the alkaline and enzyme extraction methods, were compared. Chitosan was extracted from two kinds of fat and protein obtained from larval residues and from the larval moult respectively. The optimum combination of extraction was cyclohexane and enzyme extraction; 50.5% of the constituent substances of dried larvae were obtained in this way. The reasons for the different extraction rates of the alkaline and enzyme extraction methods are discussed.福建省教育厅资助项目 (编号 :J12 38);; 泉州市科委资助项目 (编号 :Z2 0 0 10 13)
CONVEX ORDERING ANG CONDITIONAL CONVEX ORDERING FOR FUNCTIONS OF NON-NEGATIVE RANDOM VARIABLES
本文首先引入一总新的寿命分布序“〈=φ”,由此给出对广义凸序(或称广义变异性序)的一般模型的研究。关于此序的主要结果包括一般保序性,充要条件和对当F〈=φG时成立F=G的条件限制,并对其特例序“〈=e”给予了特别考虑。然后进一步引入条件序“〈=φ,ε”,讨论了充分条件、等价性及保序性。最后从单调函数类出发,考察了序“〈=e”及其与相关其他序的关系。In this paper, a new ordering “学位:理学硕士院系专业:数学系_概率论与数理统计学号:1990290
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