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.     

基于合作的主动知识外溢策略研究

合作中的知识外溢是客观存在的。知识资产所有者可以变被动知识外溢为主动知识外溢 ,利用知识外溢达成显示合作意向、塑造合作声誉、推动合作成功的目的 ,并通过两个博弈模型加以说明 :一是通过主动外溢传递合作信号 ,合作收益期望门槛降低 ,双方合作意愿加强 ;二是少量多批次外溢知识 ,可形成动态重复博弈 ,降低对合作成功度的要求 ,促成合作的成功     

Fluorescence study on the interaction between apoCopC and cupric

The interaction between apoCopC and cupric was investigated by fluorescence spectra, in phosphate （20 mmol/L） buffer at pH 6.0. Results suggest that the environment is measured to be hydrophobic completely around tryptophan （83）. At the same time, apoCopC fluorescence at 320 nm was significantly quenched with the addition of cupric and the 1：1 stoichiometric ratio of apoCopC to cupric was confirmed by fluorescence. In addition, the conditional binding constants were calculated to be Kcu-copc=（1.8±0.58）×10^13 mol^-1 L on the basis of the results of fluorescence titration curves. The apoCopC has the ability to bind specifically cupric ion.     

农技高师图书馆藏书结构的改革与建设

详细总结与论证了作为河北农业技术师范学院办学支柱之一的图书馆的藏书结构１０余年的改革与建设过程；总结和论证了农技高师图书馆藏书建设工作所要掌握的五项基本原则及其执行过程；总结和论证了河北农业技术师范学院图书馆藏书形成的四级结构模式及其利用情况     

2—壬基咪唑在铜表面形成覆膜的化学结构及其热稳定性

通过模型络合物方法及傅利叶转换红外光谱，热失重分析等手段，研究了２－壬基咪唑在过渡金属铜表面形成覆膜的化学结构及其热稳定性；进一步论证并提出了该覆膜结构；探讨了该覆膜耐热性及覆膜受热分解温度与２－壬基咪唑铜模型络合物第一分解温度的关系。本研究对开发该类特异覆膜具有实用及学术价值。     

经验极差检验和χ2检验的应用

针对某种福利彩票的设计方法,提出了两种可以用于检验产生此种彩票中奖号码是否正常的统计方法-经验极差检验和χ2检验,并用随机模拟方法计算了极差检验统计量的分布,并且对两种检验的第一类错误进行了比较,最后用这种方法对天津市某种福利彩票的中奖结果进行了正常性检验.     

Loss of cytosolic serine hydroxymethyltransferase in a formate mutant ofNeurospora crassa

Summary In the wild type ofNeurospora crassa serine hydroxymethyltransferase occurs in the cytosol and mitochondria. The formate mutant (FGSC 9) lacks the cytosolic activity but has increased levels of isocitrate lyase and glyoxylate aminotransferase. Glycine is derived from glyoxylate in the mutant.     

电液伺服系统的参数自适应控制

本文针对电液伺服系统的特点,在极——零点配置的基础上提出一种形式简单、运算量小并适用于非最小相位系统的自适应控制算法,克服了一般极——零点配置自校正调节器实用上的困难。仿真与实验证明,用这种算法控制的电液伺服系统具有良好的动态及自适应性能。     

2—赋范空间的一个不动点定理

本文给出2-赋范空间一致凸、一致正规结构、正规结构概念,指出这类空间具有不动点性质。     

对称,节奏,同步运动所产生生物电的检测

在各种各样的运动方式中，哪一种地保持人体最健康最为有效？根据假说，对称、节奏、同步 运动可能是以最低的消耗达到最大的健身目的，本文作者用检测生物电的实验众一个侧面论证了该假说的科学性。