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许胜辉 《武汉职业技术学院学报》2012,(5):62-67
从理论及试验上深入地分析了定子电阻参数变化对定子磁链估计的影响。同时,在伪降阶磁链观测器的基础上提出了定子电阻、转子电阻及转速的参考模型自适应律,从实验结果可以看出电机参数依据本文所得到自适应律进行独立辨识时可以获得的估计精度。 相似文献
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提出了一种基于最小二乘法的曲线拟合辨识多变量系统模型的方法,这种方法能够从飞升曲线的前
半部得到2×2系统最佳传递函数矩阵数学模型,并且具有较高的精度. 相似文献
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灰色系统模型在河南省老龄人口预测中的应用 总被引:1,自引:0,他引:1
利用灰色系统理论的相关知识和1998-2005年河南省人口老年化数据建立数学模型,并在此基础上对河南省人口老龄化状况进行了中长期预测. 相似文献
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卢小芬 《泉州师范学院学报》2005,23(4):24-29
电力变压器分段绕组的传递函数模型可用来实现局部放电的精确定位,受制于测量条件,其模型参数辨识较为困难,文章应用遗传算法来解决电力变压器分段绕组模型参数辨识的问题,在绕组套管上施加一脉冲信号,通过在接地端测量其响应,在分段绕组的RLC数学模型基础上,假定分段绕组各单元的绕组之间绝缘损耗RS,对地电阻Rg,线圈之间电容Cs,线圈对地电容Cg,绕组损耗R和漏抗L相等,分段绕组之间的互感M通过一个电流控制的电压源模拟,对变压器分段绕组数学模型的参数进行辨识,同时进一步研究了参数变化范围对辨识结果的影响,引入变焦算子大搜索范围与辨识精度之间的矛盾,辨识结果表明,该方法是可行的。 相似文献
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范丛山 《泰州职业技术学院学报》2007,7(4):1-4
以机械手液压驱动系统为研究对象,在推导出系统传递函数的基础上,首先利用PID控制中的P控制对系统参数进行辨识,然后以PID控制对其结果进行实验验证。并经MATLAB语言仿真分析,理论与实验结果一致性较好。文中给出了理论分析和实验方法及部分结果。 相似文献
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教研员引领的网上教研活动研究 总被引:1,自引:0,他引:1
开展网上教研活动是促进教师专业发展、提高教育教学质量的有效途径.本研究从北京市西城教育研修网网上教研活动的现状和问题入手,以远程教育理论为指导,采用合作行动研究模式,通过计划、行动、观察和反思,逐步改善网上教研活动.研究表明,开展教研员引领的网上教研活动有助于转变教师行为,增强教师参与网络教研的广度和深度.教研员应从主题、时间、要求、资源和话题无方面精心设计活动,吸引教师参与,并提供及时恰当的反馈,维持教师的参与动机. 相似文献
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This article describes 4 online workshops designed to assist college students with improving their time management, textbook reading, memory and concentration, and overall academic performance. These workshops were created to work equally well with imaginative, analytic, common‐sense, and dynamic learners. Positive student feedback indicated that these workshops met students' perceived needs and expectations. 相似文献
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以社会建构主义理论的主要观点为理论基础提出翻译工作坊教学体系,针对传统翻译教学中的诟病,阐述在该理论倡导的支架式教学指导下,翻译工作坊教学体系中创新渗透翻转课堂教学模式和计算机辅助翻译技术:课前翻译理论和计算机辅助翻译技术导入、课中译文探索及协商、课后学习绩效及意义建构评价. 相似文献
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Bertman SL 《Death education》1979,3(3):271-281
Workshops in Caring were designed to expose attitudes, biases, and concerns of a nursing home staff toward aging, illness, and death. This paper touches on techniques and materials (more literary and humanistic than clinical) for encouraging participants to focus on and share their feelings. What inhibits or facilitates a caring relationship between elderly, often terminally ill, residents and staff members was the prime focus of both sessions: "Will You Still Need Me, Will You Still Feed Me?" and "Who Owns One's Life?" 相似文献
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用不同方法进行发动机噪声源识别的研究 总被引:9,自引:0,他引:9
发动机噪声源识别对于制定发动机降噪措施十分重要 ,而像油底壳、气门罩、前齿轮室盖等罩壳类零件通常是发动机的主要噪声源 .本文用铅覆盖法和表面振动测量法对一台六缸工程机械用柴油机进行了表面噪声源识别的研究 ,得到了罩壳类零件按噪声能量大小的排列顺序 ,文中首先在半消声条件下利用铅覆盖技术测量了这些罩壳类零件的声功率 ,然后又研究了它们的振动特性 ,并通过表面振动速度的面积时间均方值预测了其声功率 .两种方法的测量结果吻合较好 ,说明了它们在工程领域应用的有效性 相似文献
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Kylie Pickles Jason J. Ivanusic Junhua Xiao Callum Durward Andrea B. Ryan Jennifer A. Hayes 《Anatomical sciences education》2019,12(1):82-89
Historical loss of staff and teaching resources in Cambodia has resulted in significant challenges to anatomy education. Small group anatomy teaching opportunities are limited. A visit to Cambodia by a teaching team from the University of Melbourne in 2010 demonstrated it was possible to implement well-resourced anatomy workshops for this purpose. However, continuation of the workshop program was inhibited by the limited number of local teaching staff. In 2015, another team from the University of Melbourne returned to Cambodia to implement anatomy workshops that incorporated peer tutoring. The objective was to improve teacher-to-student ratios and to demonstrate that interactive anatomy workshops could be delivered successfully despite low staff numbers. The anatomy workshops were attended by 404 students of Medicine, Dentistry, Nursing, and Midwifery at the University of Puthisastra. Medical students were invited to act as peer tutors for nursing students. A five-point Likert scale questionnaire was used to determine student satisfaction with both the workshops and peer tutoring. The overwhelming majority were positive about the workshops and keen for them to continue. Almost all medical students who acted as peer tutors agreed or strongly agreed that this role increased their anatomical knowledge (98%) and confidence (94%). Most nursing students agreed or strongly agreed with statements that they would like peer tutoring to continue (94%) and that they would like to be peer tutors themselves (88%). This report demonstrates that peer tutoring could be an effective tool in educational settings where poor staff-to-student ratios limit delivery of interactive workshops. 相似文献
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《实验室研究与探索》2017,(10):70-74
为了在设计阶段实现推进泵水下低频辐射噪声的测试与评估,在模型泵水力性能测试装置的基础上,提出了基于矢量声强法的模型泵水下辐射噪声对比测试方法,研制了基于二维圆弧面扫描方式的推进泵模型水下辐射噪声测试装置。测试系统采用两只一维矢量水听器组成测试线阵,实现模型泵水下辐射声功率的测试与计算。系统测试精度通过标准声源进行验证。结果表明:系统测量的绝对误差不大于±2 d B,重复性误差不大于±1.5 d B。该测试装置为推进泵的噪声控制及研究提供了比对测试试验手段和分析基础,也可为其他模型泵的噪声评估提供参考。 相似文献