刀具半径补偿在平面轮廓铣削中的应用

本文介绍刀具补偿原理,针对实际轮廓加工过程中刀具半径补偿的执行过程(建立、执行、撤消,)结合所用数控机床及系统和刀具说明其中的注意事项和零件加工程序。实践证明刀具半径补偿在粗、半精和精加工中切实可行,且符合零件加工尺寸精度要求,同时还可以完成零件上毛刺的清除。     

蒺藜果实中C_(21)甾体类化合物结构解析

采用柱层析等分离方法,从蒺藜(TribulusterrestrisL.)果实乙醇提取液的正丁醇萃取层中,分离到两种化合物。通过核磁共振、酸水解、薄层检测等方法鉴定了它们的结构。这两种化合物都是C21甾体类化合物,分别为3-O-β-lycotetraosyl3β-hydroxy-5α-pregn-16-en-20-one(Ⅰ)和3β-hydroxy-5α-pregn-16(17)en-20-one-3-O-β-D-xylopyr-anosyl(1→2)-[β-D-xylopyranosyl-(1→3)]-β-D-glucopyranosyl-(1→4)-[α-L-rhamnopyranosyl-(1→2)]-β-D-galacto-pyranoside(Ⅱ)。其中化合物Ⅰ在蒺藜科首次发现,化合物Ⅱ在蒺藜中首次发现。     

关于“验证科里奥利力对延河沿岸水土流失的影响”的调查分析

本文通过对延河沿岸的水土流失的调查，验证科氏力对右岸的影响，提出在同样条件下对右岸加固应比左岸更牢固这一建议     

Peak compression technique in high-performance liquid chromatography

Peak compression technique based on the difference of the solute migration velocity in two different mobile phases was described theoretically and confirmed using benzaldehyde and 4- hydroxyquinoline （4-HQ） as model compounds. After peak compression, the peak compression factors （the ratio of peak width at half-height under non-compression and that under compression condition） of benzaldehyde and 4-HQ were 0.19 and 0.13, respectively. By this application of the peak compression technique to the mixture, both enhanced peak height and good separation were obtained in one run cycle. This peak compression technique was introduced to determine benzaldehyde from semicarbazide-sensitive amine oxidase-catalyzed enzymetic reaction in order to illustrate the applicability of this technique to the real sample. As a result, the peak was compressed effectively, and 4.94-fold, 19.3-fold and 5.74-fold enhancement in peak height, plate number and signal to noise ratio were also achieved, respectively.     

硫代杯芳烃研究进展

介绍了硫代杯芳烃的简易合成方法，分析了硫代杯芳烃的研究动向，阐述了硫代杯芳烃在超分子化学中的应用前景。     

基于元胞自动机研究驾驶员特性对信号交叉口交通流的影响

为了研究驾驶员特性对信号交叉口交通流的影响,建立基于元胞自动机的信号交叉口交通流模型,研究驾驶员行为特性对信号交叉口平均车速和车辆延误等的影响。研究表明,不同绿信比情况下,驾驶员特性均对信号交叉口交通流产生较大的影响;冲动型驾驶员比例增加会加快绿灯放行时交通密度的疏散,稳重型驾驶员比例增加可减少绿灯交通流稳定时车辆通行的延误,胆小型驾驶员比例增加可提高黄灯时间内的通行效率以及减少红灯时间内的排队延误。研究还表明,当绿信比超过0.7时,它的变化对信号交叉口交通流影响不显著。