一种IPv6接入IPv4的网络解决方案

在现有IPv6过渡技术研究分析的基础上提出了IPv6接入IPv4的一种网络接入方案,旨在利用现有IPv4网络平台解决孤立的IPv6网络间通信的问题.     

4×100m接力中交接棒时段速度-时间曲线状态特征的分析

运用文献资料、比较分析法、举证分析等方法,根据物理学中的v-t(速度-时间)曲线原理,对4×100m接力中交接棒时段的v-t曲线特征进行整理归纳并分类,提出4种不同的交接棒的v-t曲线特征,并绘出了4×100m接力赛中不同交接棒情况下的v-t曲线,经物理学公式计算,得出其前3棒队员在交接棒时段的速度都达到百米途中跑速度的96%以上。研究结果表明,理想的4×100m接力赛的v-t曲线应是一条高而平的运动v-t直线(除起跑阶段外)。此外,结合理想的v-t曲线特征提出了上挑式的交接棒形式和双重信息传递的形式能保证交接棒时段的稳定且连续的高速度,为该项目教练员和运动员在今后的训练和比赛提供积极的理论与实践参考。     

专科生英语学习动机及四级成绩与自我评价

调查发现,专科英语专业学生学英语主要是因为“就业”、“喜欢英语”及“提高个人修养”。通过大学英语四级组与未通过组学生学习动机具有显著差异,前者以融合型为主,动机类型及使用英语期望范围较宽,后者学习英语则主要是为了就业,具有非常强烈工具型倾向,前者对学习积极性及自学能力的自我评价也明显高于后者。     

《Linux系统与应用》课程加入IPv6技术内容探析

目前下一代网络技术IPv6网络发展日趋壮大,取代IPv4的时间越来越紧迫,而我国IPv6技术人才只限于少数高校和研究所的实验室中,人数寥寥无几,急需大量培养IPv6网络管理人才。而Linux操作系统在服务器市场占有优势份额,培养既掌握Linux操作系统又懂得IPv6网络管理的人才在将来显得尤为重要。本文试图在《Linux系统与应用》课程增加IPv6技术内容达到以上目的。本文介绍了基于Linux操作系统的IPv6基础实验包括加载IPv6模块、常用的命令、隧道配置、IPv6的Web服务器、ftp服务器配置、BBS站点配置、路由配置等。这些技术是基于Linux操作系统的IPv6网络管理技术人员必须掌握的基础技术。     

基于IPv6协议的网络安全性研究

研究了当前网络安全发展的现状,分析了IPv6协议和IPv4在网络安全性上的不同策略,指出了在网络中引入IPv6后带来的安全问题,并尝试提出了一些解决方案及今后的研究方向。     

新显色剂CTZAPN与铜显色反应的研究

研究了新显色剂2-(5-羟基-1,3,4-三氮唑偶氮)-5-二乙氨基酚(简称CTZAPN)与Cu(Ⅱ)的显色反应的条件。Cu(Ⅱ)在pH7.0的NH_4Ac缓冲溶液中与CTZAPN形成稳定的组成比为1:2的紫红色络合物,λ_(max)=540nm,其表观摩尔吸光系数为5.46×10~4L·mol~(-1)·cm~(-1)。Cu(Ⅱ)在0～0.8mg/L范围内服从比耳定律。所拟方法直接用于镁合金和铝合金样品中微量铜的测定,结果满意。     

土壤NH_4~+吸附特性的研究

研究结果表明,在NH4+加入量较低时,随着NH4+加入量的增加,土壤对NH4+的吸附量呈线性增加,但NH4+的吸附率呈下降趋势;三种土壤对NH4+吸附量大小顺序为们土＞黄褐土＞水稻土．     

Interference of anti-T4 autoantibodies in the single step free T4 radioimmunoassays

The thyroid hormone profile of a hypothyroid patient, with moderate sized diffuse goiter and history of exogenous thyroid hormone therapy, was found to be highly ambiguous. The total as well as free T4 levels were consistently high (out of range) with suppressed T3 (total and free) and elevated thyrotropin levels. We incubated the serum with the radio-iodine labelled T4 and observed that the patient’s serum bound about 50.5% of the total radioactivity resulting in 85.3% interference in the radioimmunoassay. On resolving the serum proteins by cellulose acetate electrophoresis, the radioactivity was detected in the gamma globulin band. The protein profile showed mildly raised levels of IgG. Therefore it was established that the patient’s serum carried T4 reactive antibodies (IgG) which were interfering in the immunoassays. Elevated anti-thyroid microsomal antibodies were also present in the patient’s serum. The anti-T4 antibodies were highly specific for T4 and did not show any cross reactivity with the T3 or its analogues used in the estimation of free T3. We stripped the serum by precipitating the immunoglobulins and were successful in estimating the levels of free T4 in the stripped serum by single step radioimmunoassy.     

Electrical conductivity and corrosion resistance of ZnFe2O4-based materials used as intert anode for aluminum electrolysis

ZnFe₂O₄ and ZnFe₂O₄-based materials were tested to obtain the electrical conductivity and corrosion resistance in melting bath for aluminum electrolysis. The results proved that adequate additives, such as Ni₂O₃ CuO, Cu, ZnO and CeO₂ would increase the electrical conductivity, and the ZnFe₂O₄-based anodes with these additives were of good corrosion resistance. The current density on anode, the mole ratio of NaF/AlF₃ (MR) and the content of alumina in the bath effect the anode corrosion rate in different way. Project supported by the Science Foundation of Liaoning Province, P. R. China (95 – 156)     

马克思主义与五四时期青年知识分子──纪念五四运动80周年

马克思主义传入中国并为中国人所接受,经历了艰难曲折的过程。五四运动的爆发,加速了马克思主义在中国的传播;马克思主义的传播,促进了五四时期青年知识分子的进步与成长．在理论和实践上为中国早期共产主义青年知识分子指明了寻求救国救民道路的方向。