我国植物源农药的研究进展

简述了我国植物源农药的资源研究现状，植物源杀虫剂、杀线虫剂、杀菌剂和抗病毒剂的研究进展及植物源农药今后的研究方向。     

Cryptomelane（KxMn8-xO16）： Natural active octahedral molecular sieve（OMS-2）

The Xiangtan manganese deposit (XTM) used to be considered a supergene oxide manganese ore in South China. We reported a new identification of the naturally outcropping cryptomelane by examining the physical, chemical and structural features of the XTM supergene oxide manganese ore. The MnO2 content was over 90%, K2O more than 3%, and water from 2.2%-3.1% which is similar to one in zeolite. The cell parameters of the cryptomelane were given as a0 = 0.9974 nm, b0 = 0.2863 nm, c0 = 0.9693 nm and β= 91.47°. There was a larger pseduotetragonal tunnel in the natural cryptomelane that was formed by [MnO6] octahedral double chains with aperture of 0.462×0.466 nm2, filled with K cations resulting in some Mn3+ substituting for Mn4+ to balance the negative charges of structure. The finding is important not only for prospecting manganese resources in South China, but also in application of octahedral molecular sieve of natural cryptomelane as that developed in the tetragonal molecular sieve of natural zeolite o     

铂(II)与胺类配合物的合成、晶体结构和抗肿瘤活性研究

研究铂(II)与三种胺类配合物的合成、晶体结构和体外抗肿瘤活性,化合物1的X-射线单晶结构分析表明:这是一个很少见的具有四方锥几何构型的铂(II)配合物,顺式平面四方形配位的铂的轴向上有第5个配位原子。其抗肿瘤活性实验显示3个配合物对几种研究的癌细胞都有较强的抑制作用。     

Classification of Medical Brain Images

Since brain tumors endanger people‘s living quality and even their lives, the accuracy of classification becomes more important. Conventional classifying techniques are used to deal with thosedatasets with characters and numbers. It is difficult, however, to apply them to datasets that include brain images and medical history (alphanumeric data), especially to guarantee the accuracy.For these datasets, this paper combines the knowledge of medical field and improves the traditional decision tree. The new classification algorithm with the direction of the medical knowledge not only adds the interaction with the doctors, but also enhances the quality of classification. The algorithm has been used on real brain CT images and a precious rule has been gained from the experiments. This oaoer shows that the ahzorithm works well for real CT data.     

南海海底特征、资源区位与疆界断续线

根据南海海底的成因与地形特征 ,并通过建立和分析南海海底数字地形模型 ,将南海的海底分为中央的深海盆地、两侧的阶梯状大陆坡、以及周边亚洲大陆延伸的大陆架 3个地貌单元 .再据 194 7年“南海诸岛位置图”精确计算出二战后依据波茨坦公告为国际认可的断续线疆界的经纬度坐标 ,阐述了中国对南海主权的历史延续性 .最后 ,论述了南海区位与资源的优势 ,论证了其海域具体位置与巨大的经济政治战略意义 .     

基于小波分析的X线医学图像噪声综合抑制方法

提出了一种基于小波分析理论的医学X线图像噪声的综合抑制方法．将X线图像的试验处理结果与邻域平均、中值滤波去噪处理方法进行对比分析，结果表明该方法不仅能消除噪声提高图像质量，而且有效地保留了影像中丰富的细微影纹和边缘信息．     

板蓝根粗提液抑制流感病毒的实验研究

对板蓝根凝聚粗提液的抗流感病毒作用进行了研究。用丙酮脱脂提取板蓝根生药的凝集素，并分别测定各样品的血凝活性，并用45.3mg/mL的样品对流感病毒（A1／京防／97－53H1N1，A1／京防／262／95）进行了体外抑制试验。结果表明：板蓝根凝集素对流感病毒具有显著的直接杀灭作用和预防作用及较好的治疗作用，而且得出抑制流感病毒的效果与板蓝根凝集素血凝活性的高低有关。     

X线头影测量分析自动化系统研究

在Windows98的基础上，采用面向对象的方法进行分析，以Visual Basic6.0编制全部程序，建成了定点测量分程全程自动化的头影测量分析系统．利用本系统实现了对头颅定位侧位片上标志点的自动定位．系统具有人机界面友好，操作简单，功能实用，易于升级等特点．     

杀虫素48B的发酵、分离及性质初步研究

杀虫素48B是从黑微紫链霉菌浅色变种发酵液菌丝体中分离出来的一种杀虫活性物质，经过对其理化性质的测定及UV，IR，EL-MS，^1H—NMR，^13C-NMR等光谱分析，初步推测为一种长链状不饱和脂类化合物，是一种结构新颖的杀虫抗生素．’     

用保角变换-边界配点求应力强度因子的计算方法研究

介绍了用保角变换-边界配点法求解有限平面域内部孔口问题的基本方程．以中心裂纹矩形板为例，研究了计算方法中各种因素对应力强度因子形状尺寸系数YI计算结果的影响规律，得到了保角变换-边界配点法的合理计算方案，给出了有关因素对应力强度因子计算结果影响规律的数值图表和曲线．