共查询到20条相似文献，搜索用时 78 毫秒
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《四川职业技术学院学报》1991,(1)
在方框图法分析反馈放大器中,反馈类型和极性判断是否正确是分析反馈放大器的前题,如果不能正确地判别出反馈类型和极性,就根本谈不上去正确地分析反馈放大器。同样,正确地求解负反馈放大器的反馈系数,才能正确运用方框图法分析负反馈放大器的各项性能指标。然而,对于如何正确迅速地判别反馈放大器的极性和求解负反馈放大器的反馈系数,初学者往往不易很好地掌握。基于上述原因,本文就如何正确迅速地判断反馈放大器的极性和求解反馈系数进行一些分析和讨论。 相似文献
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负反馈是放大电路中被广泛采用的一项技术。本文从反馈网络、反馈极性、反馈组态等方面对负反馈电路进行了全面分析,并得出了判断负反馈的方法和技巧,提出快速判断方法、快速判断反馈的记忆口诀。 相似文献
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负反馈是放大电路中被广泛采用的一项技术。本文从反馈网络、反馈极性、反馈组态等方面对负反馈电路进行了全面分析,并得出了判断负反馈的方法和技巧,提出快速判断方法、快速判断反馈的记忆口诀。 相似文献
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第二章 放大电路中的反馈 一、反馈的类型与作用 1.按反馈极性分为正、负反馈,用瞬时极性法判断。按交直流性质分为交流反馈和直流反馈。 2.按反馈网络与输出回路的连接方式分为电压反馈和电流反馈,按反馈网络与输入回路的连接方式分为串联反馈和并联反馈。要求掌握四种连接方式的概念,判别方法及作用。 相似文献
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负反馈放大器以优良的性能得到了广泛应用，然而学生往往觉得判断反馈的正负性质比较困难，尤其是复杂电路。本文提出了放大器反馈性质的另一种判断方法——反馈网络法。该法直观、逻辑清晰，结合瞬时极性判断法，使反馈性质的判断方法多样化，非常灵活方便，使反馈性质的判断不觉得困难。 相似文献
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负反馈在放大电路中被广泛采用,文章从反馈网络、反馈极性、反馈组态等方面对负反馈电路进行了分析,得出了判断负反馈的方法和技巧,最后以实例说明负反馈电路的应用. 相似文献
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闫勇 《思茅师范高等专科学校学报》2000,16(3):19-21
指出一般教材中反馈极性、类型的判断方法及其存在的困难;对一些文献中的简捷方法提出质疑;给出一种简捷明了、适用面广的判断方法。 相似文献
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本文对模拟电子技术课程中有关“反馈”的判别方法，诸如正、负反馈，电压、电流反馈以及串联、并联反馈等做了详细的分析比较． 相似文献
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David Carless 《Assessment & Evaluation in Higher Education》2019,44(5):705-714
A key challenge for feedback practice involves promoting student uptake through the closing of feedback loops. This paper investigates feedback loops by using the concepts of single and double-loop learning to interrogate student responses to feedback. Single-loop learning tackles an identified problem or task, whereas double-loop learning additionally re-evaluates how the problem or task is approached. Evidence from a five-year longitudinal enquiry into four undergraduate students’ experiences of feedback is used to analyse feedback loops. Students reported a variety of experiences: failing to engage significantly with end-of-semester comments; short-term uptake within modules which had two assignments; and longer-term efforts at improving their learning strategies. A model of long-term student engagement with feedback is proposed, including single-loop feedback processes, double-loop feedback processes and unresolved learning puzzles. Whereas feedback loops are mainly focused on the shorter-term, it is suggested that feedback spirals represent an alternative way of analysing complex, iterative longer-term learning processes. Implications for practice focus on student self-regulation and the development of student feedback literacy. 相似文献
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导师反馈是学生修改学位论文的关键依据,在毕业论文的完成过程中起着至关重要的作用。至今,对导师反馈焦点的研究很少。该研究是英语语言学硕士毕业论文指导教师电子反馈焦点的个案研究。通过对一位导师3年来指导的10名研究生的862条反馈意见的梳理和分析,找出了导师反馈的特点、内容、类型和意义。结果表明,导师反馈意见主要涉及以下几个方面:与论文内容相关的反馈、与体裁相关的反馈、对论文组织结构的反馈以及针对语言准确性的反馈。其中,缺少近5年来的最新文献是与内容相关反馈中最突出的问题;在涉及体裁/组织结构的反馈中,论文缺乏逻辑性的问题非常突出;针对语言方面的反馈占了反馈的89%,说明英语语言表达准确性和适宜性是硕士学位论文中需要解决的问题。 相似文献
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孙宁宁 《云南师范大学学报(教育科学版)》2010,(4):17-23
文章针对留学生对汉语课＂教师反馈＂的态度做了全面的调查。调查结果发现：（1）学生普遍认为教师的口头反馈和书面反馈很重要;（2）初级汉语学习者更喜欢积极反馈,而中高级学习者更偏爱纠正性反馈;（3）初级学习者更依赖教师的口头纠错,而中高级学习者不太喜欢老师当众口头纠错;（4）学生最喜欢的纠正性反馈形式是＂重铸＂和＂明确纠正＂;（5）多数学生认为纠错的主体应主要为教师,同伴纠错被排在了最后。通过调查,建议汉语教师在提供教学反馈前,应充分考虑到学生不同的认知水平、情感因素和对反馈形式的偏好。 相似文献
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通过对体育专业体育系学生田径运动技术教学课进行长达两年的对比教学实验研究发现:在技术动作初学阶段,即刻反馈的反馈效能优于延迟反馈;在技术动作熟练阶段,适当的延迟反馈其反馈效能优于即刻反馈;在技术动作初学阶段,教师提供即刻反馈,技术动作熟练后,提供适当的延迟反馈,这种反馈时机模式的反馈效能优于单纯的即刻反馈或延迟反馈. 相似文献
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Phillip Dawson Michael Henderson Paige Mahoney Michael Phillips Tracii Ryan David Boud 《Assessment & Evaluation in Higher Education》2019,44(1):25-36
Since the early 2010s the literature has shifted to view feedback as a process that students do where they make sense of information about work they have done, and use it to improve the quality of their subsequent work. In this view, effective feedback needs to demonstrate effects. However, it is unclear if educators and students share this understanding of feedback. This paper reports a qualitative investigation of what educators and students think the purpose of feedback is, and what they think makes feedback effective. We administered a survey on feedback that was completed by 406 staff and 4514 students from two Australian universities. Inductive thematic analysis was conducted on data from a sample of 323 staff with assessment responsibilities and 400 students. Staff and students largely thought the purpose of feedback was improvement. With respect to what makes feedback effective, staff mostly discussed feedback design matters like timing, modalities and connected tasks. In contrast, students mostly wrote that high-quality feedback comments make feedback effective – especially comments that are usable, detailed, considerate of affect and personalised to the student’s own work. This study may assist researchers, educators and academic developers in refocusing their efforts in improving feedback. 相似文献
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教师对学生反馈是外语教学的重要环节之一。本文将首先从理论概念和现状两个角度对教师反馈这一重要问题进行探讨。作者对反馈内容提出建议,包括提供有信息含量的反馈,提供形成性反馈,提供真实的反馈,提供有价值的反馈,以及提供能促进合作学习的反馈。 相似文献
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大学英语写作应注重反馈环节 总被引：1，自引：0，他引：1
刘俊 《湖北广播电视大学学报》2008,28(4):148-149
英语写作是英语教学的一个重要环节,也是衡量学生语言水平的重要标准。本文从我国大学英语写作教学的现状出发,指出大学英语写作教学应注重反馈环节。因为不论是教师的书面反馈还是学生对教师反馈的反馈,它们都对提高学生的写作水平大有帮助。并且在实施反馈教学环节当中,一定要注意反馈的及时性,激励性,启发性和针对性。 相似文献
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彭玉娜 《齐齐哈尔师范高等专科学校学报》2014,(2):68-70
书面反馈是国外二语写作研究的热点,近年来在国内也兴起了一股研究热潮。本文从该研究的发展阶段、反馈类型及其有效性和教师反馈与同伴反馈之比较三个方面对近十年发表在核心期刊的相关文章展开述评,指出已有研究的不足和未来的研究方向。 相似文献
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Ye Han 《Assessment & Evaluation in Higher Education》2020,45(5):680-696
AbstractAlthough the concept of student feedback literacy has drawn increasing attention in higher education, empirical research on this matter is still in its infancy. In the area of peer feedback, little research has investigated the role of teacher follow-up feedback on peer feedback in the development of student feedback literacy. To address the research gap, a multiple-case study of three Chinese master’s students enrolled in an academic writing course was conducted, drawing on the students’ drafts with peer feedback, teacher written feedback on that peer feedback, semi-structured interviews, retrospective verbal reports, observation field notes and class documents. Three students’ epistemological and practical knowledge about, attitudes towards, and self-efficacy beliefs in peer feedback were found to improve at different paces and to different degrees. However, considerable individual variations were observed with two high-achieving, highly motivated participants becoming more feedback-literate than their under-achieving, minimally motivated peer. Teacher feedback on peer feedback was found to have distinct impacts on individual students, depending on learner factors including language ability, beliefs and motivation. These findings suggest that teacher feedback on peer feedback, if consistently provided and compatible with learner factors, can scaffold both cognitive and social-affective aspects of student feedback literacy. 相似文献