排序方式： 共有84条查询结果，搜索用时 15 毫秒
51.
夏春荣 《深圳职业技术学院学报》2011,10(5):34-37
以三组份环氧树脂的使用为例,介绍了定量混料器控制系统．研究针对不同的工作状态,执行相应的动作控制,实现定量混料器系统从第一种液体加入到混合完成输出的这样一个周期控制工作的程序实现．本设计以定量混料器控制系统为中心,包括控制系统的硬件系统组成、软件的设计、设计流程、设计要求、梯形图设计等,采用三菱公司的FX2N48MR型PLC去实现,实践证明有用而高效． 相似文献
52.
黄添彪 《中国现代教育装备》2010,(1):15-18
参照多功能剧院功能、配置及布局;研究解决提高高校阶梯型教室场地利用率的一种可行性方案。采用固定式翻转升降课桌椅、钢架式电动可伸缩阶梯;解决了制约多功能阶梯型教室实施的＂瓶颈＂;使多功能阶梯型教室的实现成为可能,为高校适应新形势发展需要,提高阶梯型教室的场地利用率提供参考。 相似文献
53.
In this work the applicability of magnetic bubble memories for the processing of inverted files has been discussed. Four novel models of magnetic bubble memories are presented to demonstrate the storage structures and the data processing. The first model employs an organization of major-minor loops. On the basis of such organization a uniform ladder is formed so that the data can be rearranged by using four operations (global shift, detached shift, exchange and delta exchange). The second model makes use of the on-chip decoder (also known as self-contained magnetic bubble-domain memory chip). For this model a hashing scheme is relied upon to perform the required data operations. The third and fourth models are different combinations of the first two models. The latter two models may provide a relatively high-speed performance as well as a reasonable system complexity.For each model the algorithms of data retrieval, sorting, deletion, insertion and updating are given. Also, a comparison of the four models has been carried out in order to determine the most convenient magnetic bubble memory structure for the processing of inverted files. 相似文献
54.
折叠波导以其宽频带、加工方便而成为一类重要的毫米波行波管慢波线结构,文章利用三维粒子模拟软件对某-W波段折叠波导慢波结构进行了模拟分析。对该行波管的色散特性、耦合阻抗模拟结果表明色散平坦、耦合阻抗高。非性注波互作用模拟结果表明,该管在工作频带内的连续波输出功率达到263．1W、增益为24dB。 相似文献
55.
现代通信系统对滤波器的要求越来越严格,要求滤波器体积小、重量轻、制造成本低、性能好且稳定,而滤波器的谐波严重影响其性能。文章从滤波器多年的发展状况总结了几种谐波抑制方法,提出了一种利用三截面阶梯阻抗和过耦合技术结合的方法,使得阻带达到了5倍中心频率。 相似文献
56.
运用文献资料、调查统计、逻辑分析等方法,以中部崛起战略机遇为出发点,重点对安徽省体育产业发展现状、省情进行研究,提出梯队发展战略构想。根据梯队战略要求,安徽省体育产业要抓住核心实体,构建"2主2从1补充"的发展重点;强调依托区域经济的发展格局,构建以快速发展的城市圈为基点的"以点带面,以面促发展"的基本框架,逐步形成大城市体育产业辐射圈、中心城市体育产业支撑点以及小城镇体育产业链优化循环体系。 相似文献
57.
曲雁 《佳木斯教育学院学报》2012,(11):96+99
本文针对学前教育专业钢琴教学中存在的学生入学钢琴基础参差不齐的前提下,对所有学生进行共同授课的大课形式,导致学生千篇一律的学习内容,学生学习缺乏积极性的教学实际,在分析我国各高校学前教育专业钢琴课程设置的基础上,本文阐述阶梯式分组教学的观点,结合学前教育专业钢琴课程的实际,在经过本校两年的学前教育专业钢琴课程教学改革实验中取得了可喜的成果。 相似文献
58.
Abstract This study reinvestigated and extended the findings of Landers and Landers (1973), which examined the influence of skilled and unskilled teacher and peer models on motor performance. Sixth grade females (N = 100) were randomly assigned to groups in a 2 × 2 (Model Type × Model Skill) factorial design or to a no-model group. In the treatment groups, subjects observed one of four unfamiliar models—(a) a skilled teacher, (b) an unskilled teacher, (c) a skilled peer, or (d) an unskilled peer—perform on the Bachman ladder task. Subjects performed 30 trials of the task and also completed self-efficacy questionnaires on three occasions. Results showed that subjects who watched a skilled model performed better than subjects who watched an unskilled model. Unlike the Landers and Landers study, no model type by model skill interaction was found. In addition, the skilled model group reported higher efficacy beliefs than the control group after performing and were more efficacious than the unskilled model subjects both after watching the model and after performing. These results suggest when students view unfamiliar models, the skill rather than the status of the model may be more salient. 相似文献
59.
60.
盛书刚 《安徽教育学院学报》2005,23(2):81-84
回环是汉语修辞艺苑里一株异彩纷呈的奇葩.它有基本格式和非基本格式.无论基本格式还是非基本格式,回环在其形态上和运用上都具有无穷的张力和魅力.梯式回环是一种非基本格式,链式回环是基本格式的一种特殊形态.梯式回环可分为山梯式回环和滑梯式回环,链式回环可分为大链式回环和小链式回环.它们各有其独特的修辞效果和美学趣味. 相似文献