47 resultados para Malfilâtre, 1733-1767.


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通过比较基因组学方法,利用哺乳动物基因组数据对不同表达丰度外显子的进化特征进行了研究.以非编码区和假基因为对照,对外显子进行序列相似度、phastCons和Ka/Ks分析,结果显示,高表达外显子十分保守而低表达和低表达的外显子也在物种间表现出保守的进化特征.低表达丰度的外显子构成了物种转录组中大多数的转录本种类,结果显示它们的进化都受到功能限制,暗示它们可能在生物进化过程中为增加生物复杂度做出贡献.

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报道中国产的淡水红藻一个新记录属——巴尔比亚藻属(BalbianiaSirodot)。

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Mechanical principles of fibre-optic disc accelerometers (FODA) different from those assumed in previous calculation methods are presented. An FODA with a high sensitivity of 82 rad/ g and a resonance frequency of 360 Hz is designed and tested. In this system, the minimum measurable demodulation phase of the phase-generated carrier (PGC) is 10(-5) rad, and the minimum acceleration reaches 120 ng theoretically. This kind of FODA, with its high responsivity, all-optic-fibre configuration, small size, light weight and stiff shell housing, ensures effective performance in practice.

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The properties of positively invariant sets are involved in many different problems in control theory, such as constrained control, robustness analysis, synthesis and optimization. In this paper we provide an overview of the literature concerning positively invariant sets and their application to the analysis and synthesis of control systems.

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数字作品的所有权证明允许在不泄漏任何秘密信息和防止所有者欺骗的前提下,对版权声明进行验证,提出一种基于Proactive可验证秘密共享和安全多方计算的数字作品所有权证明方案.在该方案中,可验证秘密共享,保证了所有权秘密的正确性,并防止对协议参与者的欺骗逼过Proactive安全提供自动恢复功能来保证协议生存周期内秘密的完整性和安全性.使用安全多方计算和同态承诺的零知识证明,实现了所有权验证,在不假设可信方存在的前提下,所提出方案能够在没有太多成员合谋的情况下,完成有效计算并发现不忠实成员.

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太阳能选择性吸收薄膜是中高温太阳能集热器的最关键部分,目前世界很多国家都在积极研究工艺简单、成本低廉、性能优良稳定的中高温光谱选择性吸收薄膜。本论文根据金属陶瓷型太阳能光谱选择性吸收表面和磁控溅射技术的原理,在国内外研究发展的基础上,针对目前国内平板型太阳能集热器的现有状况,结合太阳能热水器建筑一体化的发展趋势,开展了磁控溅射制备光谱选择性吸收薄膜的研究。本工作以直流反应磁控溅射方法作为制备手段,选择Ni-Cr合金作为靶材,以N2, 02两种气体为反应气体,反应溅射制备折射率变化的NiCr-NiCrO,N

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