Differences in the magnitude and reliability of velocity variables collected during 3 variants of the bench press exercise     

Danica Janicijevic  Jorge M González-Hernández  Yaodong Gu  Amador Garcia-Ramos 《Journal of sports sciences》2020,38(7):759-766

ABSTRACT

This study aimed to compare the reliability and magnitude of velocity variables between 3 variants of the bench press (BP) exercise in participants with and without BP training experience. Thirty males, 15 with and 15 without BP experience, randomly performed 3 variants of the BP on separate sessions: (I) concentric-only, (II) fast-eccentric and (III) controlled-eccentric. The mean velocity (MV) and maximum velocity (V_max) of the concentric phase were collected against 3 loads (≈30%1RM, 50%1RM, and 75%1RM) with a linear velocity transducer. Reliability was high regardless of the variable, BP variant, and load (coefficient of variation [CV] ≤ 4.47%, intraclass correlation coefficient [ICC] ≥ 0.87). The comparison of the CVs suggested a higher reliability for the fast-eccentric BP (8 out of 12 comparisons), followed by the concentric-only BP (5 out of 12 comparisons), and finally the controlled-eccentric BP (never provided a higher reliability). No differences in reliability were observed between experienced (CV ≤ 4.71%; ICC ≥ 0.79) and non-experienced (CV ≤ 6.29%; ICC ≥ 0.76) participants. The fast-eccentric BP provided the highest MV (p < 0.05) and no differences were observed for V_max. These results support the assessment of movement velocity during the fast-eccentric BP even in participants without experience.  相似文献   

Images and the Open Educational Resources (OER) Movement     

Jorge Enrique Perez 《The Reference Librarian》2017,58(4):229-237

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Identifying top relevant dates for implicit time sensitive queries     

Ricardo?CamposEmail authorView author&#;s OrcID profile  Ga?l?Dias  Alípio?Mário?Jorge  Célia?Nunes 《Information Retrieval》2017,20(4):363-398

Despite a clear improvement of search and retrieval temporal applications, current search engines are still mostly unaware of the temporal dimension. Indeed, in most cases, systems are limited to offering the user the chance to restrict the search to a particular time period or to simply rely on an explicitly specified time span. If the user is not explicit in his/her search intents (e.g., “philip seymour hoffman”) search engines may likely fail to present an overall historic perspective of the topic. In most such cases, they are limited to retrieving the most recent results. One possible solution to this shortcoming is to understand the different time periods of the query. In this context, most state-of-the-art methodologies consider any occurrence of temporal expressions in web documents and other web data as equally relevant to an implicit time sensitive query. To approach this problem in a more adequate manner, we propose in this paper the detection of relevant temporal expressions to the query. Unlike previous metadata and query log-based approaches, we show how to achieve this goal based on information extracted from document content. However, instead of simply focusing on the detection of the most obvious date we are also interested in retrieving the set of dates that are relevant to the query. Towards this goal, we define a general similarity measure that makes use of co-occurrences of words and years based on corpus statistics and a classification methodology that is able to identify the set of top relevant dates for a given implicit time sensitive query, while filtering out the non-relevant ones. Through extensive experimental evaluation, we mean to demonstrate that our approach offers promising results in the field of temporal information retrieval (T-IR), as demonstrated by the experiments conducted over several baselines on web corpora collections.  相似文献   

Independent Olympic Athletes and the Legitimacy of the International Olympic Committee in Resolving International Conflicts     

Tiago Del Tedesco Guioti  Mauro Cardoso Simões  Eliana de Toledo 《国际体育史杂志》2016,33(12):1304-1320

Abstract

Over the last three centuries (nineteenth, twentieth, and twenty-first) humanity has been facing huge political and ideological conflicts, especially wars. For these reasons, it was seen how necessary it was to create global institutions that aimed to promote peace and reduce or stop conflicts of this magnitude. Therefore, an international institution had already brought on its premises the principles of international peace and reconciliation through sport: the International Olympic Committee (IOC). However, despite bringing together nations around peaceful ties in an international competition, the IOC and the Olympic Games event have always been affected by constant conflicts along their path in the twentieth century, emphasizing issues involving nationalities. Thereby, in a mediator posture of international conflicts and in an effort to reduce the subversions that surrounded it, the IOC, in the 1990s, created the delegation of Independent Olympic Athletes. Such a delegation consists of athletes who cannot represent their respective nationalities at the Olympics due to political factors and/or armament conflicts. This proposal of the IOC demonstrates its posture to avoid, minimize, and even cease ideological and political events that might interfere with the Olympics Games or the athletes participating in them.  相似文献   

Unveiling the Colours of Cellulose Nitrate Black and White Film-based Negatives in Colonial Photography     

Élia Roldão  A. Jorge Parola  Márcia Vilarigues  Bertrand Lavédrine 《文物保护研究》2020,65(2):118-126

ABSTRACT

Aiming at contributing to the preservation of black and white (B&W) film-based negatives held by Portuguese archives, four photographic collections from the first half of the twentieth century were selected for study. During the macro assessment of the collections the preservation condition and hues found in photographic negatives from the Elmano Cunha e Costa (ECC) were noticed, distinguishing this collection from the remaining ones. Additional attention was given considering that the ECC collection was formed in a colonial context in the 1930s, while the others were formed on the Portugal mainland. The ECC collection results from an ethnographic survey of Angolan tribes recorded with B&W film-based negatives. In this collection, sets of negatives with pink, lemon yellow, greenish, orange brownish, and red brownish hues were found. To identify the origin of such hues, the image layer was analysed by microscale energy-dispersive X-ray fluorescence (μ EDXRF) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX). Additionally, to assess the base decay and its effect on the formation of hues, the plastic supports were characterized by Fourier transform infrared microscopy (μ FTIR). To complement the assessment of the film-base decay, pH was measured by using combined microelectrodes. The identification of mercury, iodine, chromium, and iron by μ EDXRF allowed correlation of the hues found in the negatives with chemical corrective treatments performed to improve the image quality. SEM-EDX confirmed those results and proved that the elements found were in the photographic emulsion layer. The results obtained are relevant since the hues identified may now be used as markers to indicate the technical work performed on colonial photography. Additionally, the visual and molecular assessment of the negatives’ supports (good to fair condition) allow proposing that the original storage conditions may have had a beneficial contribution to their present condition.  相似文献   

Educational decentralization policies in Argentina and Brazil: exploring the new trends     

Jorge M. Gorostiaga Derqui 《教育政策杂志》2013,28(6):561-583

This paper compares educational decentralization policies implemented in Argentina and Brazil during the 1990s, focusing on the rationales and contexts of the policies, and through a review of secondary sources and some official documents. The paper argues that school decentralization, the movement toward transferring functions and responsibilities to schools, appears as a new and extended reform that was accompanied by more traditional forms of decentralization, but also by a process of centralization of planning and evaluation at the national level. This new form of centralization/decentralization is seen as linked to the neoliberal restructuring of the state, to pressures from globalization processes and forces, and to various internal demands for improving quality and efficiency in the delivery of education.  相似文献   

The Use of Representations and Argumentative and Explanatory Situations     

Daniela Kênia B.S. Oliveira  Paula Cristina Cardoso Mendonça 《International Journal of Science Education》2013,35(9):1402-1435

This paper discusses the use of non-verbal representations in a modelling-based science teaching context, in which argumentative and explanatory situations occur. More specifically, we analyse how the students and teacher use representations in their discourse in modelling activities, and we discuss the relationships between the functions of these representations and the demands of the explanatory and argumentative situations that exist in that classroom. The data were collected by video recording all the classes in which a teaching sequence about intermolecular interactions was used—a topic which the students had not previously studied. In the activities, the students had to create, express, test, and discuss models in order to understand the difference between intermolecular and interatomic interactions, as well as their influences on the properties of substances. Initially, we selected excerpts of the recorded classes in which a non-verbal representation was used. Then, we used criteria to identify the argumentative and explanatory situations (previously defined), and we created categories for the functions of the representations that were used in order to analyse all the identified situations. The analysis supports conclusions indicating the relevance of the use of non-verbal representations in the construction, use, and defence of explanations. As the defence of explanations was the main context in which argumentative situations occurred in this study, our conclusions also indicate the contribution that representations make towards changing the status of the students' explanations.  相似文献   

Perceived effects and uses of the national teacher evaluation system in Chilean elementary schools     

Sandy Taut  Maria Verónica Santelices  Carolina Araya  Jorge Manzi 《Studies in Educational Evaluation》2011,37(4):218-229

This paper addresses the perceived consequences of the Chilean national teacher evaluation system. We interviewed 57 school leaders in 30 schools across 10 municipalities about effects and uses of the assessment in their schools. Results show that in the large majority of schools our interviewees observe positive effects such as increased teamwork and internal reflection processes based on the assessment results. Reports about effects at teacher level far outnumber institutional effects, and are mixed. In all schools our interviewees report on teachers’ negative emotions and work overload due to the assessment process, but also about their internalization of the underlying professional standards. The paper analyzes differences among schools and offers suggestions for the development of large-scale standardized teacher evaluation systems.  相似文献   

Modelling adult skills in OECD countries          下载免费PDF全文

Rosario Scandurra  Jorge Calero 《British Educational Research Journal》2017,43(4):781-804

Research in the social sciences has focused extensively on the relationship between family background, educational attainment and social destination, on the one hand, and on the processes of skills creation and skills use, on the other. This paper brings these two branches of the literature together by examining the correlation between a range of social factors. The methodology we adopt provides a comprehensive approach to the study of the channels through which literacy skills are acquired, taking into account the interrelation of family background, educational attainment, and the use of skills at work and at home. We use the Programme of International Assessment of Adult Competences (PIAAC) dataset and apply a structural equation model (SEM). Our results show that family background and education play an important role in the configuration of adult skills and skill practices. Unequal family access to resources has a strong impact at later stages in life and strongly affects educational attainment and skills outcomes. Additionally, skills use has a positive and direct impact on adult skills.  相似文献   

A conceptual framework to understand student volunteerism     

Cunha  Jorge  Mensing  Rainer  Benneworth  Paul 《Tertiary Education and Management》2019,25(1):31-44

Tertiary Education and Management - This paper develops a conceptual framework to understand the value of an increasing number of university study programmes that send students to the global south...  相似文献