基于斯密特触发器的简易数字相位计设计

基于斯密特触发器精确波形变换特性实现对两路输入信号的波形转换与校正,利用STC5410单片机计算输出,设计一款简易数字相位计,完成对两路信号相位差的测量,具有测量精度高,成本低,外围电路简单等优点.     

The experience of strangeness in education: Camus,Jean-Baptiste Clamence and the little ease

When The Myth of Sisyphus describes those who live in the ‘rarefied air of the absurd’ (p. 86), Camus uses the word fidelity. This signals a recognition of both defeat and the demand for struggle. This suggests a humility. Education can be said to have this characteristic; it is constantly in service to the new and yet understands these come with limits. And these limits are overcome as education develops the mind to see differently and change the world we live in. This type of education has fidelity to the absurd because of its cognisance of both aspiration and failure: it is aware of its useful potential to help make sense of the world, and yet it understands this requires disjuncture from what has come before. It promises the Sisyphean climb and return. Education does this consciously and deliberately. Education, in some ways, is therefore absurd. Or at least, from time to time it finds itself in the rarefied air. If this is the case then how should practitioners interpret or care for the absurd experience and what exactly might this look like in educational contexts. This article chooses The Fall for the purpose of better understanding the experience of absurd anxiety in the context of education. It uses, as an original device, the imagery of the ‘little ease’ to explore this feeling and the forces underpinning it.     

Dissecting “Peer Presence” and “Decisions” to Deepen Understanding of Peer Influence on Adolescent Risky Choice

This study evaluated the aspects of complex decisions influenced by peers, and components of peer involvement influential to adolescents’ risky decisions. Participants (N = 140) aged 13–25 completed the Columbia Card Task (CCT), a risky choice task, isolating deliberation-reliant and affect-reliant decisions while alone, while a friend monitors choices, and while a friend is merely present. There is no condition in which a nonfriend peer is present. Results demonstrated the risk-increasing peer effect occurred in the youngest participants in the cold CCT and middle-late adolescents in the hot CCT, whereas other ages and contexts showed a risk-decreasing peer effect. Mere presence was not sufficient to influence risky behavior. These boundaries in age, decision, and peer involvement constrain prevailing models of adolescent peer influence.     

“If They're Trying to Say Something About My Culture … I'm Confused”: Recognizing and Resisting Authenticity in Latino-Themed Television

The television landscape has expanded to include an ever-increasing crop of culturally themed programs aimed at the Latina/o audience. Assumptions about the audience have shaped this trend, resulting in questions about the effectiveness of niche programming to satisfy viewer taste. This project investigates LatiNation with specific focus on the differences in the reception process based on participants' connection to their ethnic identity. In-depth interviews were conducted with self-identified Latina/o students who were also given a survey with scaled items to measure their connection to their ethnic identity. In general, the findings indicate that audience members produce varied readings of the text showing the participants actively negotiate identity by using LatiNation as an opportunity to both embrace and critique Latinidad.     

Identification of a nonlinear dynamic biological model using the dominant parameter selection method

The identification of nonlinear models sometimes encounters problems because of the limited amount of available measurements in combination with a large number of uncertain model parameters to be identified. E.g., the determination of the chemical composition of a lettuce crop is a rather expensive procedure; thus the number of experimental measurements is limited. As a result, the number of parameters of the dynamic model that can be successively identified is also limited, and the subset of the parameters to be identified must be chosen in a reasonable way.Parameter estimation for an extended nonlinear three-state model for lettuce growth in greenhouses is presented in this paper. The varying structural nitrogen concentration and water contents are the new elements included in the model. The dominant parameter selection (DPS) method was used to select a suitable set of identifiable parameters. The resulting calibrated model predicts quite well the experimental data which also include observations with severe nitrogen stress.     

City of London School and Communities that Care: Researching Pupil Experience to Inform Policy and Practice in the Independent Sector

This article is an account of the decision by an independent school to participate in its local Healthy Schools Scheme. One of the factors that influenced this decision was the value the school gained from a pupil survey. The same survey was used to track the impact of the school's Personal, Social and Health Education curriculum and pastoral work on pupils' experience of the school, and academic achievement. In particular, the authors explore the role of survey analysis and consultancy advice in interpreting survey results and developing school practice. The survey contributed to pupil participation in school development. The use of an external consultant as critical friend was perceived as an aid to school reflection and self-review.     

Inter-disciplinarity in sport sciences: The neuroscience example*

Abstract

Sport science is a relatively recent domain of research born from the interactions of different disciplines related to sport. According to the European College of sport science (http://sport-science.org): “scientific excellence in sport science is based on disciplinary competence embedded in the understanding that its essence lies in its multi- and interdisciplinary character”. In this respect, the scientific domain of neuroscience has been developed within such a framework. Influenced by the apparent homogeneity of this scientific domain, the present paper reviews three important research topics in sport from a neuroscientific perspective. These topics concern the relationship between mind and motor action, the effects of cognition on motor performance, and the study of certain mental states (such as the “flow” effect, see below) and motor control issues to understand, for example, the neural substrates of the vertical squat jump. Based on the few extensive examples shown in this review, we argue that by adopting an interdisciplinary paradigm, sport science can emulate neuroscience in becoming a mono-discipline.