共查询到19条相似文献,搜索用时 135 毫秒
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为了实现对扬声器工作温度检测的需求,提出了一种基于功率试验仪的扬声器温度测试系统。该系统主要用来给扬声器以激励和监测信号,并且能够完成扬声器工作温度的测量。其与传统的微型热电偶,热探针或者红外非接触式激光测温仪等方式相比,可以在上位机测试软件中实时显示扬声器温度与时间的关系。 相似文献
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研究了以降低出行乘客在公交站点等待时间不确定性,提高公交行车时刻表准确度为目的,关于公交线路计时点和用于缓冲车辆到站时间波动的松弛时间的设计问题。研究中以系统总成本最低为优化目标,建立以计时点和松弛时间为决策变量的模型,并对该模型设计算例进行检验和分析。计时点与松弛时间的合理设置有利于降低运营成本,在减少乘客等待时间的基础上,提高车辆的到站准时性和可靠性。 相似文献
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温晓贺 《中小企业管理与科技》2012,(21)
电话计时计费器是用于对电话用户的通话过程进行计时计费的计量器具.它在程控自动电话交换机的直馈电极性反转(反极信号)电压或电流过零点时开始计时,在环境电流为零时停止计时.根据时间计量结果和相应的电话费率,给出计时、计费结果和相关信息.本文对DJ J-Ⅲ型电话计时计费器示值误差的不确定度进行了简要分析. 相似文献
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本文介绍平煤股份一矿井下轨道运输及道岔的使用情况,指出原有扳道器在使用中存在的问题和使用风控道岔扳道器的原因;阐述了风控道岔扳道器的结构、主要技术经济指标、工作原理。经过使用后的实践表明:该装置可实现车辆通过时由信号把钩工控制道岔搬动,并实现自动转辙,实现了采区轨道运输的自动化,减少了作业环节,提高了矿井运输效率和生产的安全性。 相似文献
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高压开关柜是矿区变电站中非常重要的一类电气设备。电网系统对电能质量要求提高的同时,相应地对高压开关柜的安全可靠性也提出了更高的要求。开关柜发热现象已成为开关柜使用中的常见疑难杂症,它关系着电网的安全运行。因此,找出可靠的手段在线监测触头运行温度,及时发现并排除系统的故障具有重大的实际意义。神东矿区逐步对重负荷的变电站安装开关柜触头在线监测装置。此类在线监测装置是适应开关柜向自诊断、智能化的反向发展而设计的高压断路器触头温度在线实时监测装置。目前,触头温度在线监测装置在神东矿区,将逐步得到普遍应用与推广。 相似文献
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Miles M. Yang 《Journal of Management Studies》2024,61(1):141-177
Popular business press and academic publications have advocated for stretch goals, particularly to enhance firm performance. The general assumption is that stretch goals can create a more challenging task environment that upsets complacency, inspires motivation, encourages outside-the-box thinking, stimulates search and innovation, and guides efforts and persistence. Surprisingly few systematic empirical studies have been conducted to support stretch goal deployment, such as when and how to use them. This study introduces two reflection strategies – counterfactual reflection (managers confront performance feedback and create possible alternatives) and factual reflection (managers analyse their own decisions and explain performance feedback) – and uses two experimental laboratory studies to test how different reflection strategies contribute to the stretch goal-performance relationship. The results indicated that using stretch goals does not affect firm performance, although theoretically, using stretch goals can create a more challenging task environment and enhance performance. Rather, it is the combination of the type of goal and reflection strategy that affects performance. I suspect that under stretch goals, managers may be unable to implement new ideas as expected, leading to growing performance gaps and perceived continuous failures over time. Consequently, their motivation to search for alternative solutions declines, and they may fall into a spiral of self-constrained thinking. The results demonstrate that under stretch goals, managers use factual reflection strategies to deliberately reflect on performance feedback to achieve higher performance. In contrast, managers who are assigned moderate goals perform better if they use a counterfactual reflection strategy. I suggest that by using a different reflection strategy, managers can further improve performance by encouraging directed search behaviour and avoiding self-constrained thinking spirals. My study provides a richer theoretical and empirical appreciation of the effect of reflection strategy depending on the task environment and goal-setting. 相似文献
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本文介绍了关于对KG316T微电脑时控开关进行内部改造,使其按控制要求定时输出点动信号,以便实现在无人职守的场合定时控制电脑的开关机。 相似文献
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近年来,草甘膦价格出现暴涨暴跌现象。草甘膦价格暴涨是由于受全球转基因作物种植面积持续扩大、美国因环保原因限产、原材料价格上涨等因素的影响;而价格暴跌是由于世界金融危机和草甘膦生产能力过度扩张造成。估计在未来几年里,草甘膦价格将从目前的低位逐步走高,但不会回到2008年的高位。面对大好形势,企业应抓住契机拓展国际市场,但同时要注重产品质量、降低成本和加强环保,以保持企业发展的后劲。 相似文献