镰游仆虫Euplotes harpa无性分裂时期形态发生的研究

在显微和亚显微水平上,研究了镰游仆虫Ｅ．ｈａｒｐａ的形态结构及其在无性分裂时期的形态发生。对无性分裂期间各种纤毛器原基的起源和发育作了详细的观察和描述,着重注意了各种纤毛器原基的相互关系和发生的顺序性。同时,对基体在皮层上的“移动”及基体与“基体托架”的关系也作了研究和分析。     

带观测器的模糊-线性复合控制

本文提出了带观测器的模糊-线性复合控制系统的一般结构形式,研究了模糊-Robust控制系统,文中用观测器来估计闭环系统的误差状态,将模糊控制器用于高阶系统的控制,拓广了现有模糊控制器的应用范围。     

风压与热压联合作用下高层建筑的渗风中和界

提出了一个风压、热压联合作用下高层建筑渗风中和界的计算方法。分析和推导表明：风速Ｖ、竖井与室外之间的温差Δｔ及建筑高度Ｈ对渗风中和界的综合影响取决于它们的组合Ｖ２／（Ｈ０．６Δｔ）的大小。以走廊两侧结构对称的建筑为例，导出了中和界位置与Ｓ（Ｓ＝５．７４４Ｖ２／（Ｈ０．６Δｔ））的一元函数关系。并就中和界随Ｖ，Δｔ，Ｈ的变动规律进行了分析。     

神经网络参数对地震类型识别的影响

由于震源识别模型判据选取不当或关键参数设置不合理,现有地震辨识模型的性能受到一定制约。为了改善地震类型识别效果,优化反向传播(back propagation, BP)神经网络参数设置,提出了一种经验模态分解(empirical mode decomposition, EMD)多尺度近似熵(multi-scale approximate entropy)判据,并讨论训练函数、激活函数、隐藏层神经元数目与学习速率等网络参数对地震辨识的影响。首先,针对多组天然地震事件及人工爆破事件波形进行关键信息提取与归一化,利用EMD算法提取6个本征模态函数(intrinsic mode function, IMF)和1个剩余分量(residual),然后分别计算近似熵得到EMD多尺度近似熵向量;再次,设计一系列BP神经网络调参实验,研究BP神经网络参数对地震类型识别的影响。结果表明,训练函数、激活函数、隐藏层数目等参数对地震辨识产生了明显的影响,辨识效果较好的参数组合为：训练函数采用共轭梯度法,输出层激励函数为purelin函数,隐层激励函数为logsig函数,隐层节点数和学习率分别设置为10和0.0...     

Two-dimensional self-organization of 1-nonanethiol-capped gold nanoparticles

A two-dimensional (2D) ordered hexagonal close-packed structure, formed by 1-nonanethiol-capped gold nanoparticles, is reported. The structure was constructed only by dipping the gold nanoparticle colloidal solution on flat substrate. The gold nanoparticles were synthesized as follows: First, AuCl₄^-1 was transferred from aqueous solution to toluene by the phase-transfer reagent of tetraoctylammonium bromide. Then it was reduced with aqueous sodium borohydride in the presence of a given amount of 1-nonanethiol molecules which was used to control the nucleation and growth of the gold nanoparticles for the desired size. The experimental techniques, such as UV-Vis, FT-IR, and X-ray photoelectron spectroscopy (XPS), were employed to characterize the obtained product. Transmission electron microscopy (TEM) measurement demonstrated the size of the gold nanoparticle and the formation of two-dimensional ordered hexagonal close-packed gold nanoparticle structure.     

UNIX 实时 I/O 调度策略调试器的设计

分析了在实现ＵＮＩＸ的实时Ｉ／Ｏ调度策略时遇到的难点,阐述了一种在ＵＮＩＸ核心外进行调试的方法,并设计了用于在ＵＮＩＸ核心外调试实时Ｉ／Ｏ策略的调试器．在这种调试器的帮助下,很容易设计实现ＵＮＩＸ的多种实时Ｉ／Ｏ调度策略．     

聚乙炔的链端定域态

本文用格林函数研究了聚乙炔的链端附近的电子态.计算了链端为单键或双键时可能出现的链端定域态,其结果是:单键链端可形成链端定域态,其能级位于能隙中央,定域范围约为10个原子,实际上是一个链端孤子;双键链端则不存在这种定态域.     

Assembling Zwitterionic, Water-Soluble Porphyrin and Its Biological Studies

A kind of zwitterionic water-soluble porphyrin 5-(N-trimethyl-4-aminiumphenyl)-10, 15, 20-tri (4-sulfonatephenyl) porphyrin trisammonium salt, has been synthesized. Its biological studies, interactions with DNA and bacteria cells, were investigated. The damage to the cell wall of bacteria E. coli were observed firstly by AFM (Atomic Force Microscope).     

Changes of Soil Enzyme Activities in Different Restoration Ages of Spruce Forests on the Eastern Qinghai-Tibet Plateau

Six soil enzymes (invertase, acid phosphatase, proteinase, catalase, peroxidase and polyphenoloxidase ) were chosen for investigation under different spruce forests with restoration ages of 4,10,16 years and an old-growth spruce forest over 400 years old in the eastern Qinghai-Tibet Plateau, China. Results showed that the activities of invertase, phosphatase, proteinase, catalase and peroxidase decreased in newly restored forests except for pholyphenoloxidase. With the development of forests after restoration, the activities of invertase, acid phosphadase, proteinase increased gradually. Our study also indicated that the soil enzyme activities were associated with surface soils and decreased with depths. This result suggested that in the earlier restoration stage the application of organic fertilizer may be more effective by surface addition to soils than deep addition.     

基于代理重加密的云数据共享机制的研究与实现

为了使得云端数据能灵活安全地进行共享,该文对基于代理重加密的共享机制进行了研究。该文利用代理重加密实现代理授权,设计了一种云端数据授权共享方案。代理重加密算法使用了双线性对,其安全性基于判定双线性Diffie-Hellman(Decisional bilinear Diffie-Hellman,DBDH)假设。在该方案基础上,实现了一个基于Hadoop云存储平台的云端数据共享原型系统,对其进行了测试和分析。该系统的数据共享具有高效性和安全性。该文工作对代理重加密在云端数据共享中的应用具有借鉴价值。