Splenic cellular responses in vitro after tumour-immunization

Résumé L'incorporation de³Htdr, en l'absence de PHA, a obtenu un niveau élevé chez les animaux immunisés. Les cellules témoins montrèrent une radioactivité faible, à moins qu'elles n'aient été stimulées par la PHA. Les cellules spléniques des souris immunisées ne présentèrent aucune stimulation significative par l'utilisation d'une dose optimum de PHA.     

Computer simulation of flow fields for quenching medium

Using finite element method (FEM), the complex flow fields of quenching medium in a quenching tank are calculated for the cases with and without a work-piece in it. The influence of the flow homogenization device on the flow fields is studied. The computer simulation results are in consistency with the actual measurement results. According to the simulated results, the structure of the quenching tank and the flow homogenization device are optimized and more uniform flow fields are obtained.     

Thermodynamic characterization of two novel spin-crossover complexes

Spin-crossover complexes are of great interest to the scientists because of their potential application in molecular-based electronic devices. Some octahedral metal compounds with 3dn (4 ≤ n ≤ 7) configuration can induce a spin state conversion through a fine tuning condition (temperature, pressure, light irradiation, etc.). If the conversion occurs reversibly with a hystersis loop and color change, it will make the system possessing memory effect. The memory effect can be magnified and the …     

A weak El Nio event in 2002 detected by the astronomical observation

Using the length-of-day (LOD) data series derived from astronomical observations made by various modern space techniques, southern oscillation index (SOI) and anomalies of sea surface temperature (SST) in tropical Pacific Ocean, the inter-annual components of these data series are obtained by the technique of band filtering from January 1962 to October 2002. It is found that a new ENSO event has already occurred in 2002 and been detected by the interannual LOD. It is shown by the wavelet analysis that the component with a period of about 4-6 years and the quasi-biennial component are out of phase during 2001-2002, which consequently suggests that the new ENSO event cannot be a strong one.     

加强大学生网络道德教育的认识与思考

随着人类进入信息社会，网络以其独特的方式影响着社会的各个领域。大学生作为一个特殊群体，网络给他们带来了诸多影响。重视与加强网络时代大学生网络道德教育是当前高校德育与思想政治工作的一项重要任务。文章分析了加强大学生网络道德教育的必要性，并提出加强大学生网络道德教育的途径。     

基于递归小波网络的直升机动力学模型研究

提出一种基于递归小波网络建立直升机动力学模型的方法,给出了模型结构并利用粒子群优化算法对小波网络权参数进行调整。这种网络模型利用内部状态反馈来描述系统的非线性动力学特性,不必事先确定系统模型的类别和阶次,直接建立操纵量与加速度、角速度等变量之间的对应关系,从而避免了建立复杂的气动系数、气动导数模型的过程。与传统的机理模型相比,该模型具有结构简单、并行解算程度高、运算速度快的特点。在某型直升机飞行模拟器中取得了良好的应用效果。     

基于Qmail的邮件即时通告系统分析与设计

传统电子邮件系统收发邮件的工作模式中，不能提供邮件到达即时通知，导致邮件利用延迟。以Qmail邮件系统内核为平台，通过对其基本功能结构进行分析，结合SMS短信通讯平台，设计并实现了邮件到达即时通告。     

切实加强大学生礼仪教育

礼仪是大学生思想品德、素质修养表现之一，重视和加强对大学生进行礼仪教育，培养大学生成为高素质的社会主义事业合格建设者和可靠接班人，是关系到国家前途和民族命运的大事。加强礼仪教育，提高大学生文明素养，是高校思想道德建设和社会主义精神文明建设的重要组成部分。而当前少数大学生礼仪知识缺乏，言行失弄慨象较多。因此，在大学生中开展礼仪教育便显得尤为重要。