A multi-channel differential synchronous demodulator is proposed for third harmonics suppression in three-phase receiving coils based linear inductive position sensor, which is realized by taking envelope differences of every two induced signals on three-phase receiving coils as differential signals. The proposed demodulator includes a differential synchronous envelope detector (DSED), and a time division MUX (TDM). By using the DSED, the envelope differences are synchronously demodulated as differential signals. The TDM including a multi-channel selector, a MUX and a voltage follower, is used for independently outputting the corresponding differential signals for linear position calculation. The proposed demodulator was designed in a 180 nm CMOS process and verified by Spectre simulator. Simulation results show third harmonics of differential signals are improved by 17.4 dB, indicating the proposed demodulator could be a candidate for designing the high performance analog front-end of inductive position sensor.
—The evaluation of teaching quality is indispensable in the system of higher vocational education. It not only involves the macro-control of teaching activities and the scientific management of education, but also is an important means to ensure and improve teaching quality and cultivate more high-quality application-oriented talents. Therefore, this paper, based on the characteristics of vocational education, starts from the micro perspective and combines empirical research methods to analyze the evaluation system of teachers' teaching quality. It is helpful to enrich the relevant research on the evaluation system of teachers' teaching quality by deeply thinking about the weight of each subject in the evaluation system, the rationality of evaluation criteria, the contradiction between evaluation procedures and teachers' needs, and other issues. The research shows that the application of big data technology in the teaching quality evaluation system can effectively improve the quality of vocational education and teaching, laying a solid foundation for the cultivation of applied talents.
综合应用遥感、GIS、北斗、智能传感、物联网、云计算、大数据和人工智能等技术,利用多源遥感卫星、无人机、地面监测设备等构建空天地一体化时空感知体系,助力本地建设、基础设施检测、地质灾害监测、灾后评估与决策支持和地质灾害治理搬迁工程监测等业务提供支撑,共同服务相关部门进行地质灾害监管和防治.
针对DSP2407 芯片的中断触发功能,设计出一套用于测试中断是否触发、触发中断结果是否与设置对应的测试方法.通过该方法可以快速测试DSP2407 芯片的中断响应功能是否正常,进一步提高芯片筛查的效率.
基于PHP-MySQL框架和Jquery支持库构建了一个扁平化、多终端的校园突发事件信息化处理平台模型,通过构建数据中心服务器与兼容多种终端设备的用户模块程序,在学生辅导员、家长、系部、学生管理部门及学校官方信息发布平台之间实现信息的实时共享与及时公开.使学生管理部门在发生校园突发事件后的第一时间介入处理的同时,还能够及时向家长与社会公布真实信息,为消除网络谣言,有效化解网络舆情风险提供了可靠的信息化技术支撑.
