共查询到20条相似文献，搜索用时 156 毫秒
1.
3.
《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
4.
本文主要介绍了1、反馈放大器的一般分析方法。2、应用深度负反馈下得到的虚短和虚断的概念对不同组态负反馈放大器电压增益的近似估算。 相似文献
5.
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
6.
0 引言在电子线路中,负反馈得到了广泛的应用,它可以改善放大器的性能,如提高放大器的稳定性,减小非线性失真,抑制噪声,扩宽频带和控制输入、输出阻抗等.一般来讲,一个负反馈放大器由基本放大器和反馈网络两部分组成.根据反馈网络与基本放大器在输出、输入端连接方式的不同,可将其分为4种典型类型,即:电压串联负反馈、电压并联负反馈、电流串联负反馈和电流并联负反馈.怎样对某一具体电路的负反馈类型进行判断呢?我们通过对实例进行分析,找出规律,归纳出一种简单易行的直观判断方法.1 负反馈类型的判断方法从放大器的输出端看,反馈信号取… 相似文献
7.
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
8.
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
9.
10.
李永生 《宿州教育学院学报》2001,(3):96-98
多年的教学中,发现学生对掌握交流负反馈类型的判断比较困难。单从概念上理解又较抽象难掌握,但还必须判断出交流负反馈的类型,才能理解交流负反馈对放大器交流性能的改善。现就分立元件构成放大器、运放构成放大器,引入交流负反馈的四种组态如何准确、迅速判断交流负反馈的类型的方法作一介绍。 相似文献
11.
George M. Harrison 《Journal of Educational Measurement》2015,52(4):399-418
The credibility of standard‐setting cut scores depends in part on two sources of consistency evidence: intrajudge and interjudge consistency. Although intrajudge consistency feedback has often been provided to Angoff judges in practice, more evidence is needed to determine whether it achieves its intended effect. In this randomized experiment with 36 judges, non‐numeric item‐level intrajudge consistency feedback was provided to treatment‐group judges after the first and second rounds of Angoff ratings. Compared to the judges in the control condition, those receiving the feedback significantly improved their intrajudge consistency, with the effect being stronger after the first round than after the second round. To examine whether this feedback has deleterious effects on between‐judge consistency, I also examined interjudge consistency at the cut score level and the item level using generalizability theory. The results showed that without the feedback, cut score variability worsened; with the feedback, idiosyncratic item‐level variability improved. These results suggest that non‐numeric intrajudge consistency feedback achieves its intended effect and potentially improves interjudge consistency. The findings contribute to standard‐setting feedback research and provide empirical evidence for practitioners planning Angoff procedures. 相似文献
12.
Frans Siero Jan Pieter van Oudenhoven 《European Journal of Psychology of Education - EJPE》1995,10(1):13-24
The purpose of this study was to examine the impact on students’ performance of three contingent feedback strategies used by teachers. Contigency means that the feedback strongly corresponds with task behaviour that can be controlled by the students. Elementary school students (N=296) received individualized feedback about their performance during a series of five lessons. Within this contingent feedback structure, three strategies were applied which were assumed to enhance the perceived controllability of the task situation: (1) enhancing the perceptibility of the contingency between feedback and task behavior; (2) explicit reference to effort as part of the feedback, and (3) setting of goals. As predicted, the three contingent feedback strategies had a significant positive effect on perceived controllability, and led to better task performance. 相似文献
13.
Luke Mandouit 《Educational Action Research》2013,21(5):755-769
Gathering student feedback on teaching practice is commonly used in educational settings as an improvement tool and performance measure. Typically this feedback is collected using rating style surveys when a subject concludes; however, whether this practice improves the quality of teaching requires further research. This study was designed using an action research methodology to investigate the impact of student feedback on teacher practices in a secondary setting. Specifically, the efficacy of an ongoing, collaborative feedback model in which teachers collected student feedback regularly, were guided in reflecting on the data, and were supported through professional development to improve their practices was explored. Results supported student feedback as a valuable improvement tool, and powerful stimulus for teacher reflection. Student feedback informed teachers on the effectiveness of their practice and identified areas for future professional learning. Additionally, it opened up a dialogue around teaching and learning in the classroom, and gave the teachers insights into the unique challenges experienced by their students. 相似文献
14.
《Journal of College Student Psychotherapy》2013,27(3):17-37
Abstract The present study examines self-regulation variables (goals, feedback, goal commitment, efficacy, discrepancy) within the context of a brief intervention designed to decrease heavy drinking amongst college females. Participants (N= 76) were randomly assigned to one of six between subjects conditions created by crossing goal conditions (no goal, proximal goal, distal goal) with feedback conditions (feedback, no feedback), and were assessed across time on drinking behavior and self-regulation variables. Neither goal setting, feedback, nor the combination of goal setting and feedback were superior to assessment and information in the reduction of heavy drinking. The interaction of efficacy, commitment and discrepancy failed to add to the prediction of future drinking beyond that accounted for by current drinking behavior and the main effects of self-regulation variables in hierarchical regression analyses. Correlational analyses revealed a negative relationship between efficacy and commitment and future drinking behavior. Results are discussed in relation to theory, the college student environment, and the potential limited efficacy of individual level interventions within this environment. 相似文献
15.
Christos N. Moridis Anastasios A. Economides 《British journal of educational technology : journal of the Council for Educational Technology》2012,43(3):489-504
Affective feedback during a self‐assessment test could help induce the learner to an optimal emotional state regarding the learning material. However, there is a lack of experimental evidence concerning the influence of affective feedback during a self‐assessment test. This paper is a step towards this direction. The effect of achievement‐based reward feedback on students' state and trait anxiety was examined. Ninety‐two students participated in an experiment. Half of these students received an applause sound after a correct answer to a question. Results highlight gender differences concerning this emotional type of feedback. 相似文献
16.
Tijs Rotsaert Ernesto Panadero Tammy Schellens 《European Journal of Psychology of Education - EJPE》2018,33(1):75-99
Although previous research has indicated that providing anonymity is an effective way to create a safe peer assessment setting, continuously ensuring anonymity prevents students from experiencing genuine two-way interactive feedback dialogues. The present study investigated how installing a transitional approach from an anonymous to a non-anonymous peer assessment setting can overcome this problem. A total of 46 bachelor’s degree students in Educational Studies participated in multiple peer assessment cycles in which groups of students assessed each other’s work. Both students’ evolution in peer feedback quality as well as their perceptions were measured. The content analysis of the peer feedback messages revealed that the quality of peer feedback increased in the anonymous phase, and that over time, the feedback in the consecutive non-anonymous sessions was of similar quality. The results also indicate that the transitional approach does not hinder the perceived growth in peer feedback skills, nor does it have a negative impact on their general conceptions towards peer assessment. Furthermore, students clearly differentiated between their attributed importance of anonymity and their view on the usefulness of a transitional approach. The findings suggest that anonymity can be a valuable scaffold to ease students’ importance level towards anonymity and their associated need for practice. 相似文献
17.
建立了以闭环特征谱表达的关于线性系统状态反馈解耦的充要条件,并结合线性系统的特征结构配置结果给出了求解线性系统状态反馈解耦控制的一种参数化方法。 相似文献
18.
运用教育学和现代管理学的理论与方法 ,对参加教改实验的九九级本科生进行问卷调查 ,得到他(她 )们对体育课程设置、体育教师、体育考核、体育场地器材建设、管理与使用、改进意见等反馈信息 ,并对反馈信息材料进行逻辑推理与研究 ,得出深化教改的对策 相似文献
19.
“自动控制原理”课程中状态反馈及状态重构部分内容繁杂不易理解。为使学生加深理解该部分内容,以二阶系统为例,对基于状态反馈及状态重构原理的系统校正给出了具体的模拟电子电路设计方案,并通过Simulink工具对实验过程进行仿真,仿真结果表明本文所做的电路设计是有效的。 相似文献
20.
Christopher L. Camp Jeremy K. Gregory Nirusha Lachman Laura P. Chen Justin E. Juskewitch Wojciech Pawlina 《Anatomical sciences education》2010,3(2):64-72
Professionalism is a core competency of medical training that requires students to develop the skills of providing and receiving feedback. Our study evaluated the effectiveness of delivering feedback in a group setting compared with an individual setting. The first‐year class of Mayo medical students (n = 49) enrolled in gross anatomy (in dissection teams), completed weekly anonymous evaluations of themselves and their teammates regarding seven aspects of professionalism (altruism, compassion, respect, honesty/integrity, responsibility, commitment to excellence, and self‐reflection). Professionalism scores from these surveys were calculated using a six‐point Likert scale. Students were also asked to comment on strengths and possible areas for improvement on each peer. At the midpoint of the course, peer comments and professionalism scores were shared with students in debriefing sessions either individually or with their team. Analysis of preintervention and postintervention professionalism scores indicated that the students receiving feedback in a one‐on‐one setting (student and instructor) were more likely to demonstrate higher scores on subsequent evaluations as compared with those students receiving feedback in a group setting (all team members and one instructor). Our findings suggest that providing feedback to first‐year medical students on an individual basis is the best way to improve professional attitudes and behaviors. Anat Sci Educ 3: 64–72, 2010. © 2010 American Association of Anatomists. 相似文献