Coherence estimate between a random and a periodic signal: Bias, variance, analytical critical values, and normalizing transforms     

Antonio Mauricio F.L. Miranda de S  Danton D. Ferreira  Edson W. Dias  Eduardo M.A.M. Mendes  Leonardo B. Felix 《Journal of The Franklin Institute》2009,346(9):841-853

The present work deals with recent results on the sampling distribution of the magnitude-squared coherence (also called just coherence) estimate between a random (Gaussian) and a periodic signal, in order to obtain analytical critical values, alternative expressions for the probability density function (PDF) as well as the variance and bias of the estimate. A comparison with the more general case of coherence estimation when both signals are Gaussian was also provided. The results indicate that the smaller the true coherence (TC) values the closer both distributions become. The behaviour of variance and bias as a function of the number of data segments and the TC is similar for both coherence estimates. Additionally, the effect of a normalizing function (Fisher's z transform) in the coherence estimated between a random and a periodic signal was also evaluated and normality has been nearly achieved. However, the variance was less equalized in comparison with coherence estimate between two Gaussian signals.  相似文献   

Editorial     

Teresa Grainger 《Literacy》2000,34(1):1-2

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Physiological responses in different intensities of resistance exercise – Critical load and the effects of aging process     

Vivian Maria Arakelian  Cássia da Luz Goulart  Renata Gonçalves Mendes  Nuno Manoel de Sousa  Renata Trimer  Solange Guizilini 《Journal of sports sciences》2019,37(12):1420-1428

Aim was to identify critical load (CL) in young and elderly apparently healthy male cohorts. To contrast the metabolic, cardiovascular and perceptual responses on CL according to age. We evaluated 12 young (23 ± 3 years) and 10 elderly (70 ± 2 years) apparently healthy active males, who underwent: (1) 1 repetition maximum (1RM) test on a 45° Leg Press; (2) on different days, three high-intensity resistance exercise constant load tests (60%, 75% and 90% 1RM) until fatigue (Tlim). Absolute values of both the CL asymptote and curvature constant (kg) were significantly lower in elderly subjects (P < 0.05). In contrast, elderly subjects demonstrated a significantly higher number of repetitions at CL when compared with young subjects (P < 0.05). As expected, oxygen uptake (VO₂) and heart rate (HR) during maximal aerobic exercise testing were significantly reduced in older subjects. However, percent-predicted aerobic capacity were higher in older subjects (P < 0.05). In addition, blood lactate ([La^?]) corrected to Tlim and rating of perceived exertion values were greater in younger subjects at all intensities (P < 0.05). These findings, despite reduced force production in older subjects, endurance-related parameters are well preserved according to age-adjusted percent-predicted values in apparently healthy males.  相似文献   

Montana's Indian Education for All: Applying Multicultural Education Theory     

Jioanna Carjuzaa  Mike Jetty  Michael Munson  Teresa Veltkamp 《Multicultural Perspectives》2013,15(4):192-198

Montana's constitutional commitment to the cultural heritages of American Indians exemplifies the practical application of multicultural education. In this article, the authors explore the goals and evolution of Indian Education for All within a multicultural education framework, and discuss how educators are best prepared to implement this transformative educational policy.  相似文献   

Age and Identity in Eighteenth-Century England     

Teresa Barnard 《Cultural and Social History》2016,13(2):275-276

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The Effects of Autonomy on Motivation and Performancein the College Classroom     

Teresa Garcia  Paul R. Pintrich 《Contemporary educational psychology》1996,21(4):477-486

The goals of this study were to extend the literature about classroom autonomy in several ways. First, since previous research on autonomy has tended to focus on younger learners, we examined whether the positive effects of autonomy on motivation and performance would be replicated in a college sample. Second, we tested to see whether the well-established links between intrinsic motivation and autonomy would also be found using motivational constructs that play key roles in learning (specifically, task value, self-efficacy, and test anxiety). Third, we sought to trace the effect of autonomy on changes in student motivation over the course of a semester. Finally, we examined the role of autonomy on course performance. We found that experiences of classroom autonomy in the college classroom were more closely related to motivational factors than to performance. While the immediate experience of autonomy may not be directly facilitative of high course grades, autonomy does seem to foster intrinsic goal orientation, task value, and self-efficacy, all of which are critical components of “continuing motivation.” The data presented here lend further support for the benefits of fostering autonomy within academic settings.  相似文献   

Correction to: A probabilistic approach to student workload: empirical distributions and ECTS     

Antonio Souto-Iglesias  María Teresa Baeza_Romero 《Higher Education》2018,76(6):1027-1027

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Indigenous elsewheres: refusal and re-membering in education research,policy, and praxis     

Sandy Grande  Teresa L. McCarty 《International journal of qualitative studies in education》2018,31(3):165-167

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Acquiring a New Technology at Home: A Parent-Child Study About Youths’ Influence on Digital Media Adoption in a Family     

Teresa Correa 《广播与电子媒介杂志》2016,60(1):123-139

This study examines to what extent children influence their parents’ acquisition of new technologies in a country with diverse levels of technology penetration, such as Chile. It also investigates the factors that play a role in the influence process, including children’s persuasive strategies (argumentative vs. non-argumentative) and parents’ attitudes toward technology (perceived ease of use and perceived usefulness). Using a parent-child survey and dyadic analyses, the results suggest that youths influence their parents’ acquisition of all technologies under study, particularly the Internet. Also, argumentative strategies have a greater influence than non-argumentative strategies. Finally, parents’ perceived usefulness played a more important role than perceived ease of use in the influence process.  相似文献   

Discursive negotiations of Kenyan LGBTI identities: Cautions in cultural humility     

Dustin Bradley Goltz  Teresa Mastin  Alexandra G. Murphy 《Journal of International and Intercultural Communication》2016,9(2):104-121

This study identifies and analyzes sites of discursive negotiation regarding sexual and gender minority identities in Kenya. A demonizing master narrative of homosexuality is constructed through cultural myths prevalent in Kenyan media yet challenged by claims of innate identity through strategic essentialism and glocalized naming practices. Using participant observation and creative focus group methodologies with lesbian, gay, bisexual, trans*, and intersex community members and journalists in Nairobi, Kenya this research project demonstrates the necessity of cultural humility while addressing contemporary absences in the study of queer identities in intercultural scholarship and communication research within African contexts.  相似文献