排序方式： 共有49条查询结果，搜索用时 15 毫秒
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刘建军 《信阳农业高等专科学校学报》2005,15(2):14-16
《反分裂国家法》是中国大陆为推动两岸和平统一、维护台海地区和平稳定,遏制“台独”分裂势力而制定的一部专门法律,旨在为反“台独”提供法理依据。“台独”势力的发展与膨胀,是与外部势力的怂恿与支持分不开的。因此,《反分裂国家法》的影响范围远远超出了台海地区。 相似文献
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This article deals with the research on the features and collaborative process of independent development of key automobile parts. It generally employed concurrent engineering theory and technologies of Internet & Intranet, computer aided design (CAD), computer aided manufacturing (CAM) and product data management (PDM). Field knowledge on independent development of key automobile parts was concluded and a set of concurrent collaborative environment and key enabling supporting technologies that face the independent development of automobile body panel dies were also built up. Meanwhile it introduced the secondary development methods of knowledge based engineering (KBE) to implement the knowledge transformation of designing and manufacturing experiences for an enterprise. The results was applied for the development & production of one of this enterprise's new automobile styles and work well. 相似文献
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Every sort of financial indexes of the construction project is a value occurred in future. It has a random character, so the estimation of these indexes in early stage is surely a matter of risk. In practice, the investors often choose a construction project only by simple estimation rather by deep financial evaluation and risk analysis. In this paper, taking the project NPV as an example and applying risk analysis to its estimation, the authors develop a totally new economic evaluation method for construction projects. 相似文献
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自主、合作、探究性学习作为素质教育课程改革的重要组成部分,对于提高学生的学习兴趣和学习成绩,培养学生当前独立的学习能力乃至终身学习能力有着显著的作用,因而,也成了许多教师尝试着的教学实践。本文从探究的角度出发,结合自身目前的高中历史课程教学实践,探讨如何在历史课堂进行”自主、合作、探究性学习”的教育模式,以其能抛砖引玉,求得宏篇巨论,丰富历史学科的理论研究。 相似文献
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Hannele M. Honkanen Patrick Boylan Jennifer A. Dodd Colin E. Adams 《Ecology of Freshwater Fish》2019,28(1):156-166
Atlantic salmon populations appear to fluctuate stochastically through time. It is suspected that both density‐dependent and density‐independent factors cause these fluctuations but the relative importance of each, and the life stages at which they operate, is not well known. In this study, a long‐term data set on Atlantic salmon migrants returning to the Foyle catchment, Ireland, was used to determine the role of density‐dependent and life stage‐specific environmental factors regulating population size. A Ricker density‐dependent model showed that spawning adult population size significantly predicted variation in the resultant filial generation; however, a large amount of variation (ca. 68%) remained unexplained. It was shown that environmental factors were significant in explaining some of the remaining variance and that these influences were linked to specific life stages. Three life stages—spawning and incubation, fry emergence and marine survival—were shown to have significant environmental effects that resulted in changes in the returning cohort strength. It is concluded that these life stage‐specific environmental effects are likely to contribute to the stochastic variation in population size resulting from the application of traditional stock–recruitment models. The identification and quantification of these effects should allow improved model accuracy. 相似文献
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随机变量独立性在概率论中有着重要的地位,强调了独立性在运用过程中的几个易错点,并举例加以说明. 相似文献
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绵羊血钾与其他13种蛋白基因座位遗传共适应的分析 总被引：6，自引：1，他引：6
为探讨多座位基因型非随机分布的形成机制，进行遗传共适应和连锁不平衡检测，以湖羊血钾和其它13个编码结构蛋白酶座位为研究对象，采用显隐性-显隐性和显隐性-共显性两种数据模型，进行独立性测检。结果表明：绵羊血钾遗传分化程度在其高低的各自特定范围内受到多种因素的影响；在显隐性-显隐性模型中，未发现血钾与其他座位有相关性；在显隐性-共显性模型中，发现Ke与Tf座位存在极显的相关性，Tf座位不处于Hardy-Weinberg平衡状态，其中原因有待进一步研究。 相似文献
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本文讨论了相互独立的正态变量Ｚ１，Ｚ２，．．．，Ｚｎ的函数ｆ（ｚ１，ｚ２．．．，Ｚｎ）线性型ｄ１ｚ１＋ｄ２ｚ２＋．．．ｄｎｚｎ及二次型ｎ∑ｉ，ｊ＝１ａｉｊｚｉｚｊ之间的独立性，得到了三者之间的若干独立联系。 相似文献