太平洋牡蛎面盘幼虫的压力反应研究

在正常大气压下,太平洋牡蛎面盘幼虫的游泳较为舒缓,压力提高时,表现为快速的直线运动或螺径小而螺距大的螺旋运动,并出现更频繁的下沉行为,表明幼虫的紧张度已提高。幼虫的压力敏感性随着幼虫的发育而逐渐降低,至13日龄壳顶面盘幼虫后期就消失,当9日龄壳顶面盘幼虫经过低压的一段时间适应后,在更高压力下已很难产生向上运动,利于幼虫逐步朝向水层下方移动。此外,该种幼虫的压力反应还存在着明显的“滞后”现象,其适应意义可能在于扩大幼虫的垂直分布区域。     

论田径运动会的改革

本文了讨论了体育课的教学改革,针对我校田径运动会的实际情况,进行了一些改革尝试使以前多年棘手的问题,得到了较好的解决,收到了立竿见影的效果。     

Multi-strategies in Case Based Design Knowledge Management on Web

Design knowledge management is very important toimprove the design process performance. The casebased design (CBD) is a methodology to followmankind's problem solving strategy, one of its aims isto realize the design knowledge reuse. This methodhas been used in many fields, but there are still somedifficulties that hindered its application. The first isabout the difficulty in the formalization of a designcase, especially representation of some experiencesthat was the weakness in former researches. The     

弧圈球运动理论及其攻击力探析

本文确立了弧圈球的定义,阐述它的运动轨迹,碰台反射、球路、碰拍效应等方面的变异规律,总结了构成攻击力的各个因素及其防守要点,完善了弧圈球的运动理论。     

加强产学研战略合作提升企业自主创新能力——太原市产学研战略联盟试点工作调查

为整合科技资源,提升企业自主创新能力,促进产学研在更广范围、更高层次、建大规模上的战略合作,推进区域科技创新体系建设,加快创新型城市建设,按照闷家、山西省关于加强以企业为主体的技术创新体系建设、提升企业自主创新能力的要求,太原市于2007年5月出台了<关于开展产学研战略联盟试点实施意见>,确定太原重型机械集团有限公司等10家企业为太原市的产学研战略联盟试点,全面铺开了产学研战略聪明试点工作.     

光电求积在VAXⅡ上的实现

本文系统介绍在VAXⅡ上实现的光电求积系统及其基本原理、程序结构和使用方法。该系统占内存小、运算速度高、计算精度高、实用性强。     

Induced temperature-dependent DNA degradation by C_(60) without photoactivation

This study shows that C₆₀ can degrade pBR322 plasmid DNA at room temperature without photoactivation. The degradation was enhanced by increasing incubation temperature, reaction time or C₆₀ concentration. We also found that superoxide radical anions （O 2 · ） were formed in the C₆₀ solution. Superoxide dismutase significantly inhibited DNA cleavage and O 2 · generation induced by C₆₀ . These results suggest that DNA cleavage was caused by the formation of reactive oxygen species induced by C₆₀ at room temperature. Furthermore, we demonstrate that the DNA degradation was significantly inhibited by acid amide chemicals such as formamide, and by increased ionic strength of the reaction solution. These results indicate that the DNA conformation stability and the surface properties of C₆₀ are important factors regulating DNA degradation. We propose that C₆₀ can bind DNA, decrease DNA conformation stability, and induce the formation of reactive oxygen species and DNA cleavage at room temperature. Our results provide a possible explanation for the genotoxicity of C₆₀ , which should be considered in future use of this particular nano-material.     

FMS任务可靠性分析模型

研究ＦＭＳ任务可靠性必须综合考虑系统的结构、加工工件集、加工线路集的影响，而且由于ＦＭＳ具有加工和线路柔性，因此用常规的串、并联关系难以建立ＦＭＳ的任务可靠性模型。本文结合ＦＭＳ的特点，提出了ＦＭＳ任务可靠性分析模型的建模方法，并将该建模方法用于一实例，作者认为该建模方法既综合考虑系统的结构、加工工件集、加工线路集的影响，又较好地解决了预计系统任务可靠性的复杂程度高、难度大等问题。该建模方法可用于：（１）确定整个系统或特定工件的关键设备，利于维修的安排；（２）确定最可靠的加工线路集；（３）确定系统在不同条件下的任务可靠性，这是ＦＭＳ任务可靠性综合预计模型的基础。