共查询到20条相似文献，搜索用时 109 毫秒
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液压系统的污染与控制,已引起世界的普遍关注,液压系统的污染严重地阻障了液压传动系统的广泛应用.液压系统污染的控制是一个极为复杂的课题,我们应从液压系统的合理设计与使用以及加强监督与检测,加强质量管理等方面来控制污染,最大限度地减少由液压系统污染造成的危害. 相似文献
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吴义顺 《淮北职业技术学院学报》2005,4(1):67-68
本文分析了液压系统中工作介质选用的要求和原则,提出了工作介质污染控制的基本措施．为减少液压系统故障及设备零部件损坏提供了理论依据。 相似文献
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贺全智 《吕梁高等专科学校学报》2008,24(2)
采煤机液压系统的故障率在很大程度上取决于液压油及液压元件的清洁度.据资料统计,采机170%以上的液压系统故障由液压油污染引起.因此,控制液压系统不受污染就能最大限度降低采机液压系统的故障率.通过分析采机液压系统污染的原因,提出控制液压系统污染的方法. 相似文献
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根据高职教育培养高素质技能型人才的目标,结合《液压传动》学科特点以及高职液压教学目标和特征．通过构造现场、运用现场、激活现场的实践,初步探索《液压传动》高职教学改革,提出教学形式现场化的设想。 相似文献
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液压系统的可靠性管理是指为提供能满足使用要求的高可靠性的液压系统,在系统的设计、安装、使用的金过程中所采取的提高可靠性的一切措施、方法和活动。通过提梁机现场实际运行情况分析可知,提梁机的大部分故障都是由液压系统所引起的。故对液压系统进行可靠性管理具有非常重要的意义。 相似文献
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游震洲 《温州大学学报(社会科学版)》2002,15(4):64-66
液压介质不清洁是引起液压系统结构的重要原因。本介绍了液压介质污染对液压系统的影响，污染的原因，保证液压系统清洁度的对策，及 清洁度的评价。 相似文献
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张四军 《连云港职业技术学院学报》1998,(2)
本文从液压系统污染的产生讨论了污染源的分类,并进而从传动介质、液压元件和液压系统三方面进行了污染源清除和保证传动介质清洁度的讨论,尤其侧重于污染防治的实践操作的讨论。 相似文献
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职业院校学生实习模式创新:从“顶岗实习”到“认识实习” 总被引：1，自引：1，他引：0
目前,职业院校学生顶岗实习工作中存在着企业无法或不愿接受学生实习、学生不愿或难以完成实习任务、学校片面理解顶岗实习和缺少完善的实习模式等问题,使得职业院校专业实习工作难保质量。"认识实习"模式作为"专业实习"的实现形式之一,其与"顶岗实习"具有本质上的区别,不以实习后的留岗就业为目的,具有专业面向广泛、周期短、安排灵活等特点,可以加速职业教育学生身份转变过程,进而帮助学生为下一阶段的学习做准备。 相似文献
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Kennedy Kam Ho Chan 《International Journal of Science Education》2013,35(8):1246-1278
Experiences and reflection have long been regarded as a foundation for pedagogical content knowledge (PCK) development. However, little is known about how experienced teachers develop their PCK via reflection-in-action during their moment-to-moment classroom instruction. Drawing upon data sources including classroom observations, semi-structured interviews and stimulated recall interviews based on lesson videos, this study examined instances when four experienced teachers were found to invent new instructional strategies/representations on the spot during the lesson (referred to as on-site PCK development) in their first attempts at teaching a new topic. The study documented the moment-to-moment experiences of the teachers, including their reconstructed thought processes associated with these instances of on-site PCK development. An explanatory model of a three-step process comprising a stimulus, an integration process and a response was advanced to account for the on-site PCK development observed among the teachers. Three categories of stimulus that triggered on-site PCK development were identified. Factors influencing the integration process and, hence, the resulting response, included teachers’ subject matter knowledge of the new topic, their general pedagogical knowledge and their knowledge of student learning difficulties/prior knowledge related to the new topic. Implications for teacher professional development in terms of how to enhance teachers’ on-site PCK development are discussed. 相似文献
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This article is a companion piece to “A Model for On-Site Supervision of the School Counselor,” which appeared in the December 1972 issue. It describes the perceived value of on-site supervision by trainees and the possibilities of converting on-site supervision into a continuing inservice experience for counselors. 相似文献
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Vincenza Benigno 《Technology, Pedagogy and Education》2013,22(3):347-361
Abstract The applications of network technology to pre-service and in-service teacher training are wide in scope but may nevertheless be grouped into two broad categories: the network as a source of assistance (or self-help) for teachers during the classroom transfer of knowledge which they have gained on an on-site training course; and the network as an environment where the training process actually takes place. This article describes the study of a mixed on-site/on-line approach adopted for a training course called EDIT (EDucating with Internet and Telematics); the topic of the course itself was the use of the Internet to support teaching. The distinguishing feature of the approach used is the alternation between complementary on-site training and on-line activities. 相似文献
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农村信息化系统集成工程中,对农村信息员的现场培训是必不可少的,这种培训是信息员了解、使用、管理即将建成的信息化系统平台的基础。但是在农村信息化系统集成工程中,现场培训存在诸多问题,因此应对存在的问题进行针对性地解决,才能使受培训的农村信息员达到培训目标,才能使他们在将来的岗位上发挥作用。 相似文献
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Online courses supplemented by on-site facilitators help many rural students pursue advanced coursework, but research is warranted to better understand facilitator role and training needs. This study examined facilitation experiences, demographic characteristics, and professional development activities of rural on-site facilitators associated with an online Advanced Placement (AP) program. Themes in qualitative data collected aligned with challenges related to facilitator role that have been documented in existing literature. One theme included facilitator engagement in direct AP instruction despite the facilitator role not requiring that responsibility. Self-reported facilitator demographic characteristics and professional development activities were then compared with those of on-site AP teachers in the same state. Results showed that facilitators demographically resembled teachers but lacked similar engagement with AP professional development. The role of facilitator excludes direct instruction, but specialized professional development like that for AP may match the needs and interests of these facilitators. 相似文献
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林孟清 《温州职业技术学院学报》2010,10(1):86-89
现场教学在高校思想政治理论课教学中具有举足轻重的作用。高校思想政治理论课现场教学尚处于起步阶段,从思想认识、制度保障到实际操作仍存在不少问题。努力探索行之有效的现场教学模式,合理构建现场教学的综合评价体系,充分发挥现场教学的作用,提高教学实效性,才能实现思想政治理论课的教学目标。 相似文献
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陈绍宇 《佳木斯教育学院学报》2012,(9):205-206
会计项目化课程的设计以会计职业行动为导向,通过现场调研掌握会计岗位需求、会计岗位设置、会计岗位行动及会计工作人员知识结构需求,从而分析会计岗位能力需求及职业岗位持续发展能力需求,为学生毕业就能立即就业奠定基础,体现职业教育的实时性及职业教育发展潜力。本文从实际出发,对高职院校会计专业进行的项目化改革相关问题进行探讨。 相似文献