红海揽人工苗光滩造林的生长及胁迫因子研究

于１９９４年６月至１９９５年４月在广西北界潮滩上进行红树植物红海榄人工苗造林试验．结果表明种植在滩面较高的盐地鼠尾黍盐沼草植物群落上的幼苗生长良好，成活率达９２％，枝数和叶数保持较好；该地造林的主要胁迫因子是藤壶害。通过实验，提出了在胁迫条件下的一些造林对策．     

钦州港建港条件分析与发展战略研究

钦州港建港具有十分优越的自然条件、区位优势和社会经济条件。钦州港的建设是建设大西南出海通道发展战略的重要组成部分．必须争取尽快列入国家计划重点建设工程项目。同时，贸易和加工是今后推动钦州港建设的两个轮子。应充分利用中央给广西的各种优惠政策，在港区大力发展外向型经济，以此加速钦州港的发展。     

Fuzzy属性文法及在心电图识别中的应用

本文基于Ｆｕｚｚｙ半群的观点研究了一种有效的Ｆｕｚｚｙ模式识别方法－Ｆｕｚｚｙ属性文法，并将Ｆｕｚｚｙ上下文无关属笥言语法用来描述心电图信号，从而达到了识别心电图的目的。     

人参皂苷Rb_1对脂质体二棕榈酰磷脂酰胆碱相变温度的影响

用差示扫描量热技术（ＤＳＣ）和核磁共振技术（ＮＭＲ）研究了脂质体相变温度与人参皂苷Ｒｂ＿１的关系。结果表明，Ｒｂ＿１使二棕榈酰磷脂酰胆碱相变温度降低、流动性增加，改善了细胞膜的功能。     

原白头翁素的提取,合成及保存研究

从白头翁(Pulsatilla Chinesis)植物中提取与人工合成了毛莨科植物含有的原白头翁素和白头翁素.经UV、IR、NMR、MS 等光谱分析鉴定,结构正确.经果蝇、水稻白叶枯病菌等生测试验表明,原白头翁素具有杀虫活性和显著的抑菌活性.原白头翁素聚合后,生物活性明显降低.     

MATLAB软件在电路设计中的应用

目前在电路设计中，功能验证遇到两方面困难．首先，利用手工输入测试向量的方法不能满足测试需求；其次，观测波形文件的方法不仅费时而且容易出错．本文针对在电路设计过程中所遇到的这两方面困难，以一个有限冲击响应（Finite Impulse Response，FIR）数字滤波器的设计为例．提出引入MATLAB软件进行辅助电路设计的方法．利用MATLAB软件进行电路参数确定，辅助产生电路的仿真测试向量及预期结果，并实现电路仿真结果的自动分析比较．该方法能够灵活地生成大量复杂的测试向量，减轻电路设计者的工作量，节约仿真验证时间，保证电路设计的正确性．     

Late Mesozoic metamorphic core complexes: new constraints on lithosphere thinning in North China

Metamorphic core complexes (mcc’s) are among the most prominent structural styles of lithosphere extension and thinning during late Mesozoic in North China. In this paper, the geometrical, kinematic and age characteristics of some of the mcc’s, e.g. Liaonan, Waziyu (Yiwulüshan), Yunmengshan, etc., are discussed. Some common characteristics, such as kinematic polarity, geometric asymmetry, occurrence over a time span, scattered and isolated distribution, and progressive development, can provide direct constraints on the regional lithosphere extension and thinning in North China, which does not favor the prevailing plume model，a general delamination model or extensional collapse of overthickened orogenic crust. We argue that several aspects, such as the kinematic polarity at depths during lithosphere extension, gradual break-up of lithosphere plate, relationship between magmatism and regional extension, and coeval activity of mcc’s and Tan Lu fault, should be taken into consideration when constructing a more reasonable model for lithosphere extension and thinning in North China.     

Application of Nanometer-Size Titanium Dioxide in Extreme-Trace V（Ⅴ） Analysis

0Introduction Vanadiumplaysanimportantroleinmodernindustry,es peciallyinsteelandchemicalindustry.Forinstance,itscompoundsarewidelyappliedintheproceduresofvitrioland petroleumchemicalmanufactureascatalyzers[14].Vanadium hasseveralvalences,butgenerallyitslowvalencesturnintohighoneseasilyinenvironment[5].BecauseV(Ⅴ)isthemost stableandpoisonousone,weoftenlayemphasisonitinenvi ronmentalpollutioncontrol.Vanadiumexistsinenvironmentalwaterwithextremelylowconcentration.Inseawateritscontentislessthan…     

剪切变形与转动惯量对超声波电机振动特性的影响

从梁的振动基本理论出发,寻求适合不同结构超声波电机的振动理论与振动方程,分析和计算了环形和柱体两类超声波电机的振动模态和固有频率,研究了剪切变形与转动惯量对超声波电机振动特性的影响.结果表明:估算大直径环形超声波电机的振动特性可采用伯努利欧拉梁理论;计算柱体超声波电机的振动特性时,必须考虑剪切变形和转动惯量的影响,即应采用铁木辛柯梁理论.     

Towards genetic genome projects: genomic library screening and gene-targeting vector construction in a single step.

We have developed technologies that simplify genomic library construction and screening, substantially reducing both the time and the cost associated with traditional library screening methods and facilitating the generation of gene-targeting constructs. By taking advantage of homologous recombination in Escherichia coli, we were able to use as little as 80 bp of total sequence homology to screen for a specific gene from a genomic library in plasmid or phage form. This method, called recombination cloning (REC), takes only a few days instead of the several weeks required for traditional plaque-lift methods. In addition, because every clone in the mouse genomic library we have constructed has a negative selection marker adjacent to the genomic insert, REC screening can generate gene-targeting vectors in one step, from library screening to finished construct. Conditional targeting constructs can be generated easily with minimal additional manipulation.