细胞凋亡与运动训练关系的研究进展

细胞凋亡和坏死是截然不同的细胞死亡形式。目前 ,细胞凋亡的研究已涉及生命科学的各个领域。在运动训练状态下开展有关细胞凋亡机制的研究 ,可从新的角度解释疲劳的发生机制 ,找出监测疲劳的更有效指标 ,并对开发新的促进恢复的营养补剂和全民健身产生积极作用     

迎接21世纪信息技术的挑战

在这21世纪即将来临之际,本文首先简要回顾了我国信息技术应用的状况,然后简要地介绍了美国总统顾问委员会给美国总统的咨询报告,最后则从信息处理的角度对我国今后的发展提出了若干建设性的建议。     

MIXED H_2/l_1 OPTIMIZATION PROBLEMS FOR SISO DISCRETE TIME CONTROL SYSTEMS

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｄｅｓｉｇｎｏｆｃｏｎｔｒｏｌｌｅｒｓｓａｔｉｓｆｙｉｎｇｍｉｘｅｄｐｅｒｆｏｒｍａｎｃｅｃｒｉｔｅｒｉａ ,ｓｕｃｈａｓｍｉｘｅｄＨ2 /Ｈ∞ｐｒｏｂｌｅｍ(Ｋａｍｉｎｅｒｅｔａｌ.,1 993 ) ,ｍｉｘｅｄｌ1 /Ｈ∞ｐｒｏｂｌｅｍ(Ｓｚｎａｉｅｒｅｔａｌ.,1 996) ,ｍｉｘｅｄｌ1 /Ｈ2ｐｒｏｂｌｅｍ(Ｓａｌａｐａｋａｅｔａｌ.,1 995) ,ｈａｖｅｒｅｃｅｎｔｌｙｂｅｅｎｔｈｅｆｏｃｕｓｏｆｒｅｓｅａｒｃｈｅｒｓ.Ｖｏｕｌｇａｒｉｓ(1 995)ｉｎｔｒｏｄｕｃｅｄｍｉｘｅｄＨ2 /ｌ1 ｏｐｔｉｍ…     

Mixedl 2/l 1 control for discrete-time systems via lagrange multiplier theory

The dual formulation of the discrete-time mixedl ₂/l ₁ control design problem was achieved by using the duality theory of Lagrange multipliers. For some special dual mixedl ₂/l ₁ problems, an approximation method for the optimal value is introduced. A suboptimal value of the infinite-dimensional dual problem can be obtained by solving a sequence of truncated problems. The convergence property of the solution scheme is investigated. This paper gives a low approximation method for the primal problem. Project(699085) supported by Zhejiang Provincial Natural Science Foundation of China.     

超临界CO2萃取法与微波辅助萃取法提取当归挥发油的比较

采用GC—MS联用技术对超临界CO2萃取法与微波辅助萃取法两种方法提取到的当归挥发油进行了成分和含量分析。当归挥发油中主要活性成分为藁本内酯。用超临界CO2萃取得到的当归挥发油中藁本内酯含量最高,可达60％,但挥发油收率只有1．9％;溶剂微波辅助萃取得到的挥发油中藁本内酯含量较低,为30％-50％,但挥发油收率有2．6％。4．4％。     

利用2,4-二硝基苯肼做吸附剂进行现代居室中痕量甲醛的富集定量

本文用敷有2,4-二硝基苯肼的高分子多孔微球做吸附剂,将甲醛富集起来,然后用乙腈溶剂脱附,再通过一个5μm的C18柱进行分离,最后用高效液相色谱法测定。     

温度场中斜梁受简谐激励的1/2次亚谐-主参数共振

以温度场中斜梁受简谐激励的非线性振动方程为基础,应用非线性振动的多尺度法,求得非线性振动系统1/2亚谐-主参数共振的一次近似解,并进行定常解稳定性分析和数值计算.分析了温度、激励、几何尺寸对1/2亚谐-主参数共振幅频响应曲线的影响.     

2,4-二甲氧基苯甲醛的合成

目的研究2,4-二甲氧基苯甲醛的合成.方法以间苯二酚为原料,用Gatternann-Adams法合成2,4-二羟基苯甲醛,再经硫酸二甲酯甲基化.结果总收率65.6%.结论在2,4-二羟基苯甲醛的甲基化的反应中,我们改变了传统的以氢氧化钠为碱,以水为溶剂的方法,收率有较大提高.     

美国“共同核心州立标准”中K～2年级语言标准简介

美国2010年颁布的"共同核心州立标准"包括《共同核心州立数学标准》和《共同核心州立英语语言标准》。本文介绍了《共同核心州立英语语言标准》的目标、结构以及K～2年级的具体内容。这份标准对我国《3～6岁儿童学习与发展指南》的制订与实施有借鉴意义。     

The educational expectations of Italian children: the role of social interactions with the children of immigrants

This paper aims to investigate to what extent the growing presence of children with immigrant background in the Italian school system has an impact on the educational expectations of Italian students in eighth grade. Educational expectations are individuals’ plans for their future educational career, adjusted to the subjectively estimated probabilities of achieving a given outcome. Multilevel analyses are performed using data from ITAGEN2 (Italian Second Generation) survey, the first nationwide survey on natives, first- and second-generation immigrants. Results demonstrate that attending a school with a high proportion of children of immigrants has no impact on realistic expectations about secondary education. In addition, students attending schools with high level of interethnic integration are more prone to having high educational expectations.