6RA70在直流传动系统中的应用

介绍SIMOREG 6RA70的特点,对系统各主要模块的功能进行了论述,介绍了它的工作原理,系统具有安全、可靠等特点。     

计算机基础课教学CAI系统

计算机课是入门较难的课 ,计算机辅助教学软件的使用 ,既能让学生随时请到一个不厌其烦的老师 ,又能让教师准确了解学生掌握的情况 ,从而提高计算机基础课的教学效果     

Effect of Mixed Solvents and Additives on the Habit Modification of 6-APA Crystals

6-aminopenicillanic acid (6-APA) crystals obtained under different physical and chemical conditions of the solutions may present different habits. The habits of diamond-shaped plates are desirable compared with other habits of 6-APA crystals. To obtain ideal 6-APA crystals, the effects of the mixed solvents and additives on 6-APA crystal habits were investigated. Ethanol or acetone was used as the organic solvent, and impurities existing in the ,6-APA purification process were used as the additives. 6-APA growth habits were changed when the concentrations of ethanol, acetone or phenyl acetic acid were increased to exceed their critical concentration. The observed results show that the dominant face on 6-APA crystals was identified to be , {020}, but the overall habit was controlled by the relative growth rates of the : 101 and {002} faces. Crystal growth rates and habits can be appreciably changed by specific adsorption of additives on crystal faces. In some cases solvent molecules can act in a similar way and may be regarded as bulk additives. The effects of additives and organic solvents on 6-APA crystal habits were the results of adsorption effect,which fitted the experimental results quite well.     

反应挤出制备HDPE/PA 6/MMT复合材料研究

通过反应挤出制备了高密度聚乙烯/聚酰胺6/蒙脱土(HDPE/PA 6/MMT)复合材料,研究了MMT在HDPE/PA 6共混物中的分散和分布情况,及其对共混物相态结构的影响。从XRD和TEM的结果中可以看出,有机化蒙脱土(OMMT)选择性地分布在PA 6相内以及两相的界面上,钠基蒙脱土(Na+MMT)则主要分布在PA 6相内;大部分OMMT得到较好的剥离或插层,而Na+MMT出现明显的团聚。FE-SEM分析结果表明,增大MMT的含量会导致PA 6的相态尺寸变大,粒径分布变宽。流变分析结果表明,由于OMMT部分分布于两相界面处,从而增强了界面结合,对共混物起到了增容作用。     

IPv6环境下IPSec协议安全机制的研究与实现

介绍了IPv6的发展概况,分析了IPsec协议的安全体系结构、各部分功能及其相互间关系、IPsec协议在IPv6中的工作原理等,探讨了IPsec协议在IPv6中应用所存在的问题,详细分析了其在Windows、Linux等操作系统中的软件实现过程。     

6-甲基-2-（α-羟甲基）-1H-苯并咪唑荧光增敏探针法测定蛋白质

以6-甲基-2-（α-羟甲基）-IH-苯并咪唑（MHMBM）作为荧光探针,利用蛋白质对MHMBM荧光增敏作用,建立了测定人血清总蛋白的新方法。结果表明,在中性水溶液中,MHMBM的荧光强度与牛蛋白（BSA）的浓度呈良好的线性关系,相关系数（r）为0．9995,检出限2．3μg／mL,线性范围4．6—60．0μg／mL。本方法用于测定两种样品溶液中的总蛋白,RSD（n=6）分别为1．7％和1．3％,回收率95．5％和98．6％。     

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.

适应性运动对大鼠离心运动后血浆IL-6变化的影响

观察适应性运动对大鼠大强度离心运动后不同时相骨骼肌结构及血浆IL《变化的影响。方法：80只大鼠分为对照组和实验组,实验组进行两周离心跑台训练。两周后观察各组在运动前及完成一次性跑台离心运动后即刻、24h、48h和72h观察比目鱼肌结构及血浆IL-6的变化。结果：（1）运动后两组大鼠比目鱼肌均出现损伤性改变,尤以对照组更为明显,且以运动后24-48小时较为严重。（2）对照组运动后即刻血浆IL-6显著增高,随后逐渐下降,72h再次显著增高。实验组运动后48h达峰值。实验组运动后血浆IL-6水平低于对照组。结论：适应性运动有助于减轻离心运动导致的骨骼肌超微结构损伤,对血浆IL-6水平的升高有抑制作用。血浆IL-6可能与由剧烈运动导致的肌肉损伤有关。     

含金废液中金回收的研究

本研究从含金废液中回收金,我们采用PVC－尼龙6树脂快速分离富集金,用亚硫酸钠洗脱液洗脱,用氢氧化钠、双氧水还原得到金,金的回收率可达97．7％。这一方法操作简单,易于掌握,取得了满意的结果。     

尼龙6改性苯酚-淀粉树脂的合成及性能

介绍了尼龙6改性苯酚-淀粉树脂的合成（原料配方、工艺路线、工艺参数和操作方法）及性能．性能测试与应用证实,与苯酚-淀粉树脂相比,它是一种改进了脆性、提高了弯曲强度和冲击强度的新树脂．