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提出了一种能抑制DBD电路参数变化的并能保证主电路始终工作在感性状态下的控制电路。该电路通过利用触发脉冲的下降沿和电流过零点这段时间间隔,对电路中的电流实行积分,并与感性实现的临界条件进行比较,作出判断,保证该电路工作于感性工作条件。仿真结果验证该电路确实能够抑制电路中的某些参数变化.使电路保持零电压开通。 相似文献
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采用新型CMOS电流传送器组成了一种新的电路结构,根据该电路实现了通用电流传送函数。该电路结构简单、设计容易、通用性强,在电流模式模拟信号处理中有应用价值。以电流模式三阶低通滤波器传递函数的实现电路为例完成了MOS管级的计算机仿真,结果表明提出的电路正确可行。 相似文献
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针对未知逻辑的故障电路诊断与修复问题,研究了一种以同样功能的正常电路作为参考电路,然后利用电路逻辑快速重构算法进行故障修复的方法。该算法将对参考电路的逻辑功能采集与故障电路的逻辑功能重构同步进行,既能降低算法运行过程中的空间消耗,同时也避免了故障电路逻辑功能重构过程中,进行复杂的逻辑综合。此外该算法改进了传统的分块串行处理模式,解决了将采集数据分块并行逻辑综合的问题,提高了故障电路重构的速度。测试表明,相对直接的Q-M逻辑综合算法,该算法处理时间最快能减少70%。 相似文献
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针对本系运动控制实验室的QH-200光栅,提出了由四个积分型单稳态电路构成的四倍频电路来提高光栅的检测精度,介绍了该四倍频电路的设计原理和硬件电路的实现方法.为了检测该四倍频电路的实际功能和效果,给出了由51单片机构成的两相方波信号发生器的程序流程图. 相似文献
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设计了篮球比赛场地计时计分系统,该系统包括了硬件电路部分和软件系统部分,其中硬件电路包括单片机控制系统、提示音电路、译码电路、键盘接口电路、显示接口电路的设计。软件系统部分包含主程序、动态显示子程序、定时中断子程序、按键子程序、延时子程序的设计。实验证明,该系统可靠性强、操作容易、携带方便,可以满足篮球比赛的要求,具有广阔的市场前景。 相似文献
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骆舒萍 《漯河职业技术学院学报》2012,11(2):1-4
介绍一种基于ARM9微处理器s3C2440A的嵌入式网络通信接口电路,该电路采用以太网控制芯片cs8900A实现了网络的互联。给出了硬件电路的设计和软件的设计思路,该设计方案具有硬件电路简捷、成本低、性能可靠等特点。 相似文献
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姜振华 《内蒙古师范大学学报(哲学社会科学版)》1996,(3)
听、说、读、写这个顺序是人们学习第一语言的基本顺序。读、说、听、写则是人们学习第二语言的顺序。第二语言的学习是在母语的符号思维系统已经建立起来并相当牢固之后开始的;第二语言的学习是在一种自觉状态中进行的,是一种有意识的学习。母语在第二语言的学习过程中起着极其重要的作用。双语共存的教学本质上是一种比较型教学。 相似文献
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城市精神不是一个空泛的东西,它体现了城市中的人所具有的精神风貌,具体地说,它至少包括平等、契约、宽容、创新与共生等诸方面观念,这些观念则要通过教育获得. 相似文献
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E. J. Capaldi Donna R. Verry Timothy M. Nawrocki Daniel J. Miller 《Learning & behavior》1984,12(1):7-20
Two experiments indicated that two approaches to serial learning are too extreme—the classical view that it consists only of interitem associations and various recent views that it involves no interitem associations. The novel assumption introduced here was that phrasing cues, normally conceptualized as merely segregating long series into smaller units or chunks, may also enter into associations with items, thereby reducing interitem interference and facilitating serial learning. It was found that one item could become a signal for another item, an interitem association, or be overshadowed by a phrasing cue, such as a brightness and temporal cue, also signaling that item. The items were .045-g pellets. Rats traversed a runway for items arranged in ordered series, 14-7-3-1-0 pellets (Experiment 1) or 10-2-0-10 (Experiment 2). Complete tracking of, for example, the 10-2-0-10 series would consist of fastest running to 10 pellets and slowest running to 0 pellets. In both investigations, the interitem association overshadowed was that between 0 pellets and the subsequent rewarded item, 0 → 14 (Experiment 1) or 0 → 10 (Experiment 2). Either repetitions of the 14-7-3-1-0 subpattern (Experiment 1) or merely the terminal 10-pellet item (Experiment 2) were phrased, both methods producing identical results. Overshadowing the 0-pellet item produced superior serial learning, more rapid extinction, and, in Experiment 1, considerable elevation of responding when the brightness phrasing cue was introduced in extinction, an effect said to be conceptually identical to spontaneous recovery and one demonstrating directly that phrasing cues are in reality overshadowing cues. It was suggested that many effects attributed to forgetting may be due to unrecognized overshadowing of memory cues by phrasing cues, giving rise to exaggerated estimates of forgetting. 相似文献
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Dr. William R. Tracey 《Clearing house (Menasha, Wis.)》2013,86(5):212-214
This article examines and critiques the leadership capacity of department leaders in a high school and attempts to gain a deeper understanding of how department leaders perceive their role as teacher leaders, making a distinction between what an individual department leader does in his or her position and teacher leadership as a form of continuous learning and innovation through collaboration. How do department leaders practice leadership to improve student learning? The author provides an investigation and analysis of the current level of leadership capacity exhibited by department leaders in a high school. A close look at the role and function of department leaders in this high school reveals an absence of the teacher leadership necessary to promote the broad-based leadership capacity that results in improved student achievement. 相似文献
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《Cultura y Educación》2013,25(2):103-106
ResumenEn este artículo, se reflexiona sobre las críticas hechas por Emilio Sánchez al Lenguaje Integrado. Estas críticas sugieren la necesidad de abrir paréntesis educativos donde se enseñe al niño a automatizar los procesos de reconocimiento de palabras, aspecto que no tiene en cuenta este movimiento. Sin embargo, veremos cómo la enseñanza aislada de estas habilidades ignora, por una parte, que la lectura y la escritura suponen adquirir conocimientos que van más allá del reconocimient o de palabras, y por otra, que dicho reconocimient o no se da sólo por vía fonológica, sino que precisa de otras vías de acceso léxico que funcionen en paralelo para que el reconocimiento sea efectivo en los procesos de comprensión de textos. Veremos cómo las actividades que propone el L.I. son las ideales para desarrollar estas habilidades. 相似文献
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Ian Winchester 《Interchange》2008,39(4):389-390
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