基于人工标引的中文学术期刊文献自动分类算法

为了解决期刊电子化的自动分类问题 ,提出了一种基于中文学术期刊人工标引的自动分类算法。这种算法主要利用自动分词得到各文献的特征词向量空间 ,并考虑到人工标引在分类中的关键作用 ,得到综合了特征词 TF和 IDF权重的分类准则。通过适当训练建立分类库 ,计算待分类样本与已知分类的相似性 ,判别各分类。实验表明 :该分类算法可以获得 85 %的分类识别率     

采用时空混沌耦合映象格子产生混沌扩频序列

利用耦合映象格子这一具体的时空混沌模型来产生混沌扩频序列，研究了产生混沌扩频序列的方法，并对序列特性进行了分析，结果证明产生出来的序列扩频特性性能良好，可以应用于扩频通信系统。     

基于灰生成空间的高阶GM(1,1)模型

在AGO-IAGO灰生成空间的基础上，给出了r阶GM（1，1）灰色模型的一般建模方法，并且用实例证明了该方法能够提高GM（1，1）模型的精度。     

转基因植物的生态影响

自从1983年转基因植物诞生以来，至今各种类型的转基因植物进入大田实验已不计其数，很多产物已商品化。作为生物界的新品种，转基因植物在带来巨大的经济效益和社会效益的同时，也带来了潜在的风险。从生态学角度论述了转基因植物所带来的影响及采取相应的措施来加以调控和管理。     

Combinatorial Design of Some Database Application Technologies Based on B/S

Evolving From principal-subordinate structure of C /S to flexible multileveled distributed structure, i.e. B/S architecture so as to form a wide, distributed and orderly Internet/Intranet integrated management inf ormation system, is the trend of development of application software of the whol e world. Advantages and disadvantages of the two modes: C/S and B/S are compared . It is pointed out that at present onefold B/S mode cannot yet fully fullfil th e demands of some complicated data processing, inform...     

Transformation of japonica rice with RHL gene and salt tolerance of the transgenic rice plant

Overexpression of the yeast HAL2 gene increases salt tolerance of yeast and plant. Rice HAL2-like (RHL) gene was introduced into a japonica rice cultivar HJ19 with Agrobacterium tumefaciens-mediated transformation. Transgenic plants in R0 generation were selected on the principle of GUS-positive, RHL gene PCR-positive and normal growth. Hygromycin-resistant plants of some transgenic lines in R1 generation increased salt tolerance during the seedling and booting stage, being less damaged in the cytomembrane and stronger in leaf tissue viability under salt stress during booting period. Southern analysis of transgenic lines tolerant to salt in R1 generation showed that the RHL gene expression cassette had been successfully integrated into rice genome. Moreover, gene engineering breeding methodology and really salt-tolerant rice cultivar were discussed.     

Characterization of Type p Banach Spaces by the Weak Law of Large Numbers

For weighted sums of the form ∑j＝1anjXnj where {anj, 1≤j≤kn ↑∞,n≥1 } is a real constantarray and {Xnj, 1≤j≤kn ,n≥1 } is a rowwise independent, zero mean, random element array in a real sep-arable Banach space of type p, we establish Lr convergence theorem and.a general weak law of large num-bers respectively, conversely, we characterize Banach spaces of type p in terms of convergence in r-thmean and probability for such weighted sums.     

Inhibiting Effects of S.acus Linnaeus Extracts on GLT-82 Tumor Cell Lines

Hailong S.acus Linnaeus was chosen as the experimental material in the experiments and changes of cell morphology, forming rate of clone and changes of division index were conducted to identify the inhibiting effects of Hailong extract on human tumor cell lines (GLT-82). Four days after medication, most of the cells changed their normal morphology of tumor cells and became round, broken and even broke into pieces. The inhibiting rates could reach 75.1% on the fourth day. The division index reduced strongly and the clone could not form or the forming rate was very low. With the extract concentration increasing and the time prolonging, the inhibiting effect increased. These results indicate that Hailong has striking anti-tumor effects and will have a perfect future in the fields of treatment and prevention of cancer.     

Reductase activity of human thioredoxin-like protein and its effects on cell apoptosis

Thioredoxin is a ubiquitous dithiol oxidoreductase found in many organisms and involved in numerous biochemical processes. Human thioredoxin-like protein (hTRXL) is differentially expressed at different development stages of human fetal cerebrum and belongs to an expanding family of thioredoxins. Recombinant hTRXL and truncated hTRXLs corresponding to the N-terminal (hTRXL-N) and C-terminal (hTRXL-C) domains are expressed and purified. In insulin disulfide reduction assay, both full-length hTRXL and hTRXL-N show reducing activity for the insulin disulfide bonds. As expected, the hTRXL-C failed to reduce insulin. MCF-7 cell stably transfected with hTRXL cDNA exhibits increased sensitivity to apoptosis induced by phorbol myristic acetate (PMA) and ionomysin.     

果实成熟与多聚半乳糖醛酸酶基因的研究进展

对与果实成熟相关基因多聚半乳糖醛酸酶 (PG)基因的筛选、鉴定、表达及基因工程的研究进展作一个简要评述