基于LINUX内核模块在工业级AP上实现

将许多已经在有线网络上成熟的技术,移植到无线网络设备中。介绍了如何在使用LINUX系统的工业级AP上实现IGMP Snooping的方法。提供了实现框架、IGMP控制包的处理方法以及主要的数据结构。本方案结合无线网络特点实现IGMP Snooping为无线实现组播数据传输提供帮助。     

Moodle LMS平台语言教学活动模块应用技巧

Moodle平台作为目前世界上最为流行的学习管理平台之一（LMS—Learning Management System）,有着许多功能强大教学活动模块。由于其免费开源的特点,使得全世界有很多用户专门为其开发出专业教学活动模块插件,其中包括了如：教学游戏,泛读,Covell等专门针对语言教学而开发的免费模块插件。这些插件结合Moodle自身原有的学习活动模块,大大增强了Moodle台在英语语言教学的功能。本文通过笔者对这些平台的应用心得体会,向读者展示了如何有效地利用上述插件模块,增强Moodle平台的语言教学功能,从而更有效提高语言网络课程的效果。     

基于CMMI模型的软件规模估计方法研究

软件规模估计是CMMI成熟度三级项目策划过程域的基础,是影响软件项目成败的关键因素之一。合理的软件规模估计是保证软件项目符合预算和进度要求的前提条件。描述了基于CMMI模型的软件项目估计,提供了5种软件规模估计方法及相关过程,并对各种方法的应用范围进行了分析。提出的5种软件规模估计方法为制定合理可行的软件开发计划提供了有力的支持。     

用友ERP-U8院校版安装问题研究

针对学生在安装用友ERP-U8管理软件中存在的问题,结合实际应用经验对安装ERP-U8所需的操作系统和数据库的版本兼容性进行了分析,并给出了建设性的软件安装方案。     

Teachers’ perceptions of assessments of their mathematical knowledge in a professional development course

The purpose of the project reported in this article was to evaluate how assessing teachers’ mathematical knowledge within a professional development course impacted from the teachers’ perspective their learning and their experience with the course. The professional development course consisted of a 2-week summer institute and the content focus was geometry. We had decided to assess the mathematical learning of the teachers during this professional development course for various accountability reasons, but were concerned about possible negative by-products of this decision on the teachers and their participation. Thus, we worked to design assessment in ways that we hoped would minimize negative impacts and maintain a supportive learning environment. In addition, we undertook this evaluation to examine the impacts of the assessment, which included homework, quizzes, various projects, and an examination for program evaluation. Seventeen grade 5–9 teachers enrolled in the course participated in the study by completing written reflections and by describing their experiences in interviews. We learned that while our original intent was “to do no harm,” the teachers reported that their learning was enhanced by the assessment. The article concludes by describing the various properties of the assessments that the teachers identified as contributing to their learning of the geometry content, many of which align with current recommendations for assessing and evaluating grade K-16 mathematics students.

四种预处理因素的凝缩和抑制效应

比较研究了秋水仙素、8—羟基喹啉、对二氯苯、低温四种预处理因素对蚕豆根尖细胞染色体的凝缩效应和对有丝分裂的抑制效应。结果表明:(1)四种预处理因素积累中期细胞和使染色体凝缩的效应大小是:秋水仙素>低温>>对二氯苯>>8—羟墓喹啉。(2)秋水仙素对染色体的凝缩具有长效性,其它三种因素则是短效的。(3)8—羟基喹啉强烈抑制有丝分裂和细胞生长,并且难以恢复,使根尖细胞受到严重毒害。秋水仙素先是使有丝分裂受到抑制,之后又刺激有丝分裂。低温、对二氯苯也能抑制有丝分裂,但恢复较快。     

荧光光谱滴定法测定修饰环糊精与金刚烷衍生物的稳定常数

8-羟基喹啉修饰环糊精可发射8-羟基喹啉基团的荧光,环糊精和8-羟基喹啉基团存在自包结现象,当该修饰环糊精加入金刚烷衍生物后,金刚烷衍生物和修饰环糊精形成更稳定的包合物,可以把环糊精自包结的8-羟基喹啉基团顶出环糊精空腔,从而引起饰修环糊精荧光强度的变化。通过测定荧光强度的变化值,测得修饰环糊精与金刚烷衍生物配合物的稳定常数为LogKs=4.015。     

两种诱变剂对蚕豆根尖细胞遗传毒理学研究

以蚕豆根尖为材料，用微核实验和染色体畸变试验方法，研究不同浓度的8-羟基喹啉与对苯二酚对蚕豆根尖细胞的有丝分裂指数、微核率和染色体畸变率的影响．结果表明：不同浓度的8-羟基喹啉与对苯二酚使蚕豆根尖细胞有丝分裂指数明显增加，诱发较高频率的微核，在一定浓度范围内，其微核率随处理浓度的升高而升高，但随着诱变剂浓度的升高而呈下降趋势．两种诱变剂还能诱导染色体产生多种类型的畸变，染色体畸变率随着处理浓度的增加而升高，随着浓度的进一步增加却呈现下降趋势，但均明显高于对照组．     

3Cr2W8V模具钢球化退火工艺研究

分析模具凹模坯料用冷冲压制造型腔时开裂的原因，进行了几种3Cr2W8V模具钢球热处理软化工艺试验，观察了组织，测定了力学性能，获得实际生产中可行的3Cr2W8V模具钢球化退火工艺．     

过氧乙酸的制备方法与其稳定性的实验研究

为了分析、研究过氧乙酸生产中过氧化氢浓度、冰醋酸用量与不同稳定剂含量对产品稳定性的影响,对不同生产配方和加入稳定剂后的过氧乙酸产品在自然存放条件下的贮存稳定性进行了实验测定。结果显示,当过氧化氢与冰醋酸的配制比例为1:2时,过氧化氢浓度越高,过氧乙酸的产率越高;过氧乙酸浓度越高,贮存稳定性越差;1g.L-1的8-羟基喹啉或0.1%磷酸稳定剂可有效提高过氧乙酸的稳定性。