高校“体教结合”发展与存在问题研究

通过对我国高校"体教结合"发展的理论溯源,运用文献资料、逻辑分析等方法对我国高校体教结合发展的现状进行分析,提出目前我国高校"体教结合"所存在的问题,为优化高校高水平运动队的建设与"体教结合"的健康发展提供理论参考。     

Methanol as a probe to investigate the relationship between the secondary electron donor TyrZ and the substrate water molecules in active photosystem Ⅱ

The secondary electron donor, TyrZ, is implicated in tuning the primary charge separation and the water oxidation in active pho-tosystem II (PSII). Two types of mechanisms have been proposed to explain the function of TyrZ. One is that TyrZ tunes the water oxidation through the direct interaction with substrate water molecules; the other is that TyrZ is located in a hydrophobic envi-ronment without interacting with H2O, and controls the water oxidation by tuning the strength of the hydrogen bond between Tyr...     

Analysis and Design of Conjugate Cam Shedding Mechanism with Dual Driving Shafts

The principle of conjugate cam shedding mechanism forthe outside tappets with dual driving shafts is discussed,and its design conditions and parameters are studied,giving the results of practical calculations finally.     

核碰撞中的K介子源大小

用事件产生器ＵＲＡＳｉＭＡ模拟了１６０Ａ ＧｅＶ／ｃＰｂ＋Ｐｂ反应中的Ｋ介子产生，并分析了两Ｋ玻色－爱因斯坦关联。理论结果较好地符合ＮＡ４４的初步数据。     

概率统计中几个概念的辨析

相容性、独立性，相关性是概率统计中几个常见的易混概念，针对这几个概念加以辩析。以概念的基本定义和性质为基础，运用举例，推证等方法，力图澄清三者之间的区别和联系。     

Database Security and Supervisory Method in Oracle

This paper discusses how to use the security measurements, such as privileges, roles, views, stored procedures and triggers, to ensure the safety of a database system. This paper also gives an example of making use of some special views of ORACLE DATA DICTIONARY to track the security records of a database system.     

Improved 2-D Stability Margin Test for 2-D Discrete Systems

１ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｎｃｅｓｔａｂｉｌｉｔｙｍａｒｇｉｎｄｅｆｉｎｉｔｉｏｎｓａｎｄｔｅｓｔｓｆｏｒ２－Ｄｄｉｓｃｒｅｔｅｓｙｓｔｅｍｓｗｅｒｅｐｒｏｐｏｓｅｄ［１，２］，ｓｏｍｅｉｍｐｒｏｖｅｍｅｎｔｓｈａｖｅｂｅｅｎｍａｄｅ［３，４］．...     

转换温度中Berthelot物态方程内压强项温度指数的修正

设定Berthelot实际气体物态方程内压强项中待定的温度指数参数为α,根据热力学理论推导出具有温度指数参数的Berthelot实际气体转换温度与压强的函数关系式,应用计算机MATLAB模拟仿真技术绘制反转曲线,将其与气体实验反转曲线进行对比,确定两者拟合情况较好时的指数修正参数,得到修正后的Berthelot实际气体物态方程。修正后的Berthelot实际气体物态方程在描述气体通过节流手段获得低温时更贴近气体的实验行为,在节流制冷工艺流程中具有更强的使用价值和理论指导意义。     

δ~(13)C difference between plants and soil organic matter along the eastern slope of Mount Gongga

Carbon isotope ratios (δ 13C) of plants, litter and soil organic matter (0–5 cm, 5–10 cm and 10–20 cm) on the eastern slope of Mount Gongga were measured. The results show that δ 13C values of plants, litter and soil organic matter all decrease first and then increase with altitude, i.e. δ 13C values gradually decrease from 1200 to 2100 m a.s.l., and increase from 2100 to 4500 m a.s.l. The δ 13C altitudinal variations are related to the distribution of C3 and C4 plants on the eastern slope of Mount Gongga, ...     

CO气氛下CaO对铁晶须生长影响的原位观察和机理研究

利用光学体视显微镜和高温热台对CO气体还原Fe2O3过程进行原位观察,并结合扫描电镜、能谱和红外光谱分析,研究掺入CaO对还原过程中铁晶须生成和生长机理的影响.实验结果表明:铁晶须是在实现FeO→Fe转变时形成和不断生长的;CaO对氧化铁的还原有抑制作用,当掺入CaO质量分数≥8%时,没有铁晶须生成和生长.因此,可以通过控制CaO掺入量的方式抑制铁晶须的生成和生长,进而减少矿粉颗粒团聚的发生.