Introduction to the Treatment of Non-Linear Effects Using a Gravitational Pendulum     

Klaus Weltner  Antonio Sergio C. Esperidião  Paulo Miranda 《Science & Education》2004,13(7-8):611-629

We show that the treatment of pendulum movement, other than the linear approximation,may be an instructive experimentally based introduction to the physics of non-lineareffects. Firstly the natural frequency of a gravitational pendulum is measured as functionof its amplitude. Secondly forced oscillations of a gravitational pendulum are investigatedexperimentally without limiting amplitudes. By this arrangement new phenomena, thebistability and the jump-effect, can be observed. In the case of bistability the drivengravitational pendulum can oscillate in two different stable modes. Either it oscillateswith a small amplitude and approximately in phase with the exciting torque or it oscillateswith a larger amplitude and approximately anti-phase. The jump effect is the spontaneoustransition from one mode of oscillation to the other. Both effects can be demonstrated andexplained.  相似文献   

Governing through parents: a genealogical enquiry of education policy and the construction of neoliberal subjectivities in England     

Antonio Olmedo  Andrew Wilkins 《Discourse: Studies in the Cultural Politics of Education》2017,38(4):573-589

In this paper we explore the various spaces and sites through which the figure of the parent is summoned to inhabit and perform market norms and practices in the field of education in England. Since the late 1970s successive governments have called on parents to enact certain duties and obligations in relation to the state. These duties include adopting and internalizing responsibility for all kinds of risks, liabilities and inequities formerly managed by the Keynesian welfare state. In this paper we examine how English parents are compelled to embody certain market norms and practices as they navigate the field of education. Adopting genealogical enquiry and policy discourse analysis as our methodology, we explore how parents across three policy sites or spaces are constructed as objects and purveyors of utility and ancillaries to marketization. This includes a focus on how parents are summoned as (1) consumers or choosers of education services; (2) governors and overseers of schools and (3) producers and founders of schools.  相似文献   

The moral choices children attribute to adults and to peers: Implications for moral acquisition     

Herbert D. Saltzstein  Antonio Roazzi  Maria da G. Dias 《European Journal of Psychology of Education - EJPE》2003,18(3):295-307

Thirty-six children (half 6–8 years old and half 10–12) in Northeast Brazil heard three hypothetical dilemmas featuring a choice between telling the truth and keeping a promise. Each dilemma was initiated by a different kind of lie: an exculpable pro-social lie (teasing), a lie in the personal domain (hiding) and a lie in the service of an anti-social act (cheating). They were asked to choose between truth and promise, and to attribute choices to adults and to peers. More younger than older children chose truth on all three dilemmas. Both regression and SSA analysis showed that “peer-judgments” predicted own judgments on all three dilemmas, but “adult-judgments” did so only on the dilemma, which featured an exculpable lie and involved no adults. The findings may be interpreted as supporting either (a) a constructivist account of development or (b) a learning account that features implicit processes.  相似文献   

Teaching Chronobiology and Sleep Habits in School and University     

Carolina V. M. Azevedo  Ivanise Sousa  Ketema Paul  Marlene Y. MacLeish  M Teresa Mondéjar  Juan Antonio Sarabia  M. Ángeles Rol  Juan Antonio Madrid 《Mind, Brain, and Education》2008,2(1):34-47

ABSTRACT— Early morning school schedules are in the opposite direction to the sleep–wake cycle in adolescence and early adulthood. This conflict leads to sleep deprivation and irregular patterns whose consequences are scarcely explored. This article discusses the effects of three educational experiences with high school students, parents, teachers, and medical students. The first experience was developed with high school students in Natal, Brazil, to determine whether sleep habits would improve with increased awareness. Positive effects were observed in some aspects of sleep knowledge and practices. In the second experience in Atlanta, GA, sleep education activities were presented to middle and high school teachers, parents, and students to emphasize the importance of sleep. In the third program in Murcia, Spain, undergraduate medical students were introduced to chronobiology of sleep by a practical exercise that pointed out to what extent they shared most of adolescent sleep characteristics. Educational chronobiological experiences about sleep are essential to develop healthy sleep habits in the general population, particularly in students.  相似文献   

Short-term economic incentives in new product development     

Antonio Davila 《Research Policy》2003,32(8):1397-1420

This study investigates the use of variable compensation to motivate new product development managers and its impact upon the performance of new product development projects. Using data from 56 projects, the paper examines how technology-intensive firms compensate their product development managers. The study finds a positive and significant relationship between the use of short-term economic incentives and project performance; however, the slope of this relationship is not linear and its intensity (slope) decreases as the percentage of variable compensation increases; furthermore, the relationship is contingent on the level of project uncertainty. The results also indicate that higher project uncertainty is associated with a lower level of variable compensation. Moreover, organizational structure, through its effect upon the allocation of uncertainty among organizational participants, also affects the level of variable compensation.  相似文献   

Leadership development programs: investing in school principals     

Eric Tingle  Antonio Corrales  Michelle L. Peters 《Educational studies》2019,45(1):1-16

Considering that some university-based principal preparation programmes may not be properly training principals for leadership roles, “grow your own” leadership development programmes have become more popular across the US. This study provides a contribution to previous research in terms of the specific components a district leadership development programme may incorporate into its curriculum in order to positively influence school principals’ effectiveness as school leaders. A purposeful sample of second-, third- and fourth-year campus principals working in a large urban school district in the south-west region of the US who had participated in their district’s leadership development programme were administered the Principal Effectiveness Survey and participated in semi-structured interviews to examine the influence of the programme on the participants’ effectiveness as leaders. Survey results indicated that principals consider training activities related to human capital, executive leadership, school culture and strategic operations as having a “high” influence on their effectiveness as school leaders. In addition, interview data revealed the importance of supervisor support and building relationships with peers as critical to their continued success as leaders.  相似文献   

Government as a platform,orchestration, and public value creation: The Italian case     

Antonio Cordella  Andrea Paletti 《Government Information Quarterly》2019,36(4):101409

E-Government literature has discussed how the adoption of the Government as a Platform (GaaP) can help public administration to produce more efficient public services. However, since little attention has been given to the impact of GaaP on public value creation more research is needed to analyse whether the GaaP is effective to help the government to deliver public services that fulfil social expectations and, hence, public value. Indeed, efficiency does not guarantee public value. Besides efficiency, public value incorporates citizens' variegated expectations and needs that change over time and that are sometimes rival. For these reasons, the delivery of public value is often challenging for public agencies. The aim of this paper is to explain how the GaaP configuration can help public administration to deliver public value better. The paper finds that the modularity of the platform configuration and different ecosystems that support public agencies need to be orchestrated to support the effective creation of public value. The authors analyse the case of the Italian GaaP initiative to discuss the importance of the orchestration of the GaaP characteristics to improve the coordination among public agencies and enable the co-production of services with external actors, in order to deliver public value better. The findings show that the orchestration of the GaaP configuration characteristics can enable Italian public administration to deliver public value, but also that, if the GaaP is not properly orchestrated, it can constrain the creation of public value.  相似文献   

From Ancient Greece to Modern Education: Universality and Lack of Generalization of the Socratic Dialogue     

Andrea P. Goldin  Laura Pezzatti  Antonio M. Battro  Mariano Sigman 《Mind, Brain, and Education》2011,5(4):180-185

Two thousand four hundred years ago Socrates gave a remarkable lesson of geometry, perhaps the first detailed record of a pedagogical method in vivo in history [ Plato. (2008) . Apología de Sócrates. Menón. Crátilo. Madrid: Alianza Editorial]. Socrates asked Meno's slave 50 questions requiring simple additions or multiplications. At the end of the lesson the student discovered by himself how to duplicate a square using the diagonal of the given one as the side of the new square. We studied empirically the reproducibility of this dialogue in educated adults and adolescents of the 21st century. Our results show a remarkable agreement between Socratic and empiric dialogues. Even in questions in which Meno's slave made a mistake, within an unbounded number of possible erred responses, the vast majority of participants produced the same error as Meno's slave. Our results show that the Socratic dialogue is built on a strong intuition of human knowledge and reasoning which persists more than 24 centuries after its conception, providing one of the most striking demonstrations of universality across time and cultures. At the same time, they also emphasize its educational failure. After following every single question including Socrates' “diagonal argument,” almost 50% of the participants failed to learn the simplest generalization when asked to double the area of a square of different size.  相似文献   

Effects of treadmill running and fatigue on impact acceleration in distance running     

José Antonio García-Pérez  Salvador Llana Belloch  Ángel Gabriel Lucas-Cuevas  Daniel Sánchez-Zuriaga 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(3):259-266

The effects of treadmill running on impact acceleration were examined together with the interaction between running surface and runner's fatigue state. Twenty recreational runners (11 men and 9 women) ran overground and on a treadmill (at 4.0 m/s) before and after a fatigue protocol consisting of a 30-minute run at 85% of individual maximal aerobic speed. Impact accelerations were analysed using two lightweight capacitive uniaxial accelerometers. A two-way repeated-measure analysis of variance showed that, in the pre-fatigue condition, the treadmill running decreased head and tibial peak impact accelerations and impact rates (the rate of change of acceleration), but no significant difference was observed between the two surfaces in shock attenuation. There was no significant difference in acceleration parameters between the two surfaces in the post-fatigue condition. There was a significant interaction between surface (treadmill and overground) and fatigue state (pre-fatigue and post-fatigue). In particular, fatigue when running overground decreased impact acceleration severity, but it had no such effect when running on the treadmill. The effects of treadmill running and the interaction need to be taken into account when interpreting the results of studies that use a treadmill in their experimental protocols, and when prescribing physical exercise.  相似文献   

Rubrics and self-assessment scripts effects on self-regulation,learning and self-efficacy in secondary education     

Ernesto Panadero  Jesús Alonso Tapia  Juan Antonio Huertas 《Learning and individual differences》2012,22(6):806-813

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