摘要：振动信号是反映精密球体研磨状态的重要途径。利用加速度计传感器、数据采集卡和LabVIEW,设计一套基于虚拟仪器的振动信号检测设备,对精密球在研磨加工过程中的振动信号进行测试,从时域、频域等多个角度进行分析。结果表明:利用精密球体研磨加工的振动信号能有效地监控整个研磨过程,实时反映球体研磨的状态和精度。

摘要：本文介绍了校园一卡通中的身份验证子系统,它对校园网中的其他信息服务系统提供安全统一的身份认证和权限管理服务,维护系统中的用户数据并对其他业务系统提供接口。

摘要：目前,《大学计算机基础》作为非计算机专业学生的入门基础课程处于急需全面改革的情况。本文探讨了本校该课程的现状,提出分层案例改革的思路,对计算机基础教材的案例化教学内容进行改进,使其适应和挖掘不同专业和基础学生的学习能力,提高课程的满意度。

摘要：As important constitutes in many drugs, piperazine comprised compounds are of great interest for drug design. In this paper, two piperazine-based compounds were synthesized for the first time, with different strategies exploited. For one compound, a highly reactive intermediate of isothiocyanate was constructed to get the desired piperazinecarbothioamide. The synthesis of the other compound was completed sequentially through Friedel-Crafts acylation, coupling reaction and Michael addition. Both synthetic routes have short steps and acceptable yields, and such strategies can be applied to the synthesis of similar oioerazine-containin~ comoounds.

摘要：二维地震勘探观测系统设计时,满覆盖次数理论设计应该为常数,均匀分布,但当最小偏移距大于0.5倍道距时,满覆盖区域覆盖次数理论设计可能出现变化现象。通过对此现象发生的原理分析、总结,最终得出了满覆盖区域覆盖次数理论设计稳定时影响满覆盖次数的3个关键因素,即最小偏移距、炮间距和接收道数,及其对应的关系,在实际应用中得到了较好的效果。