三种群捕食-食饵离散系统的持久性

研究了具有第Ⅱ类功能性反应的三种群捕食-食饵离散系统，得到了保证该系统持久性的充分条件．     

Effect of calcium ions on the secondary structures of photosystemⅡ and its relations with photoinhibition

Calcium ions play an important role in the oxygen_evolving process of photosystem Ⅱ as demonstrated in many experiments. The changes of the secondary structures of PS Ⅱ induced by the depletion of Ca 2+ were reported. The results indicated that the removal of Ca 2+ led to the transition of α helix to turns and sheet structures. While Ca 2+ was re_added to the media, only the structures changed to turns could be recovered. The protein conformational changes of PS Ⅱ during the donor side photoinhibition induced by the depletion of Ca 2+ were also studied. This showed that the protein conformational changes differed between the control and Ca 2+ _depleted samples in a short period of illumination (within 10 min). However, the changes became similar when the illumination time was increased.     

Bio-rational design of photosystem Ⅱ inhibitors (Ⅰ)──Molecular modeling of cyanoacrylates and ureas in photosystem Ⅱ D1 protein of Pisum sativum

Molecular modeling of cyanoacrylates and ureas with D1 protein of Pisum sativum have been presented. Studies show that these two kinds of inhibitors occupy the similar region in the D1 protein. Cyanoacrylates have more binding sites than ureas, thus they have higher activities.     

储蓄凭条中手写体的提取与净化系统

给出了储蓄凭条手写体提取系统的设计与实现,包括预处理,建立模板,基线定位与去除,倾斜校正 处理,定位格去除和手写体净化分割等。重点讲述了图像二值化,手写体分割与净化算法。     

Auto CAD实用技巧

本文详细介绍了如何把AutoCAD绘制的图形插入到Word文档;如何把Excel制作的表格插入到AutoCAD图形中,并转换成AutoCAD图元以及对象选择的几种方式。     

温度对第二类哑铃畴畴壁中VBL的影响

实验研究了非压缩状态下第二类哑铃畴（ⅡＤ）畴壁中垂直布洛赫线（ＶＢＬ）的温度稳定性，发现了与材料参量有关的两个重要温度（Ｔ）（ⅡＤ）与（Ｔ０）（ⅡＤ）当温度达到（Ｔ　）（ⅡＤ）时，ⅡＤ畴壁中的ＶＢＬ开始丢失；当温度达到（Ｔ０）（ⅡＤ）时，所有ⅡＤ畴壁中的ＶＢＬ链全部解体。在（Ｔ　　）（ⅡＤ）与（Ｔ０）（ⅡＤ）之间，温度越高，ⅡＤ畴壁中丢失的ＶＢＬ数目越多。     

非完整可控力学系统的形式不变性

研究非完整可控力学系统的形式不变性,建立系统的运动方程和形式不变性判据方程,得到系统方程保持形式不变性的条件以及守恒量的形式,举例说明结果的应用。     

汇文Libsys5.5和ILASⅡ馆藏统计功能对比分析--以河北工程大学图书馆实践为例

介绍了ILASⅡ和汇文Libsys5.5的馆藏统计功能设置,阐述了汇文Libsys5.5和ILASⅡ馆藏统计功能的应用,提出了ILASⅡ向汇文Libsys5.5转换时应注意的问题。     

一种Cu(Ⅱ)超分子配合物的合成、晶体结构和磁学性质

一种Cu(Ⅱ)超分子配合物[Cu(μ1,5-dca)(dca)(bpy)]n(1)被合成并用单晶X-射线和磁性进行了表征.化合物1是由两组平行的二维网互相穿插形成的三维结构.磁表征结果显示在化合物1中Cu离子之间表现出通过二氰胺和4,4'-联吡啶桥传递的弱反铁磁相互作用.