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Abdallah Rejeb Amanda Johnson Roel Vaeyens Cosmin Horobeanu Abdulaziz Farooq Erik Witvrouw 《European Journal of Sport Science》2017,17(4):495-502
The present investigation was carried out to examine the incidence and pattern of injuries in adolescent multisport athletes from youth sports academy. Injury data were prospectively collected from 166 athletes during the seasons from 2009 to 2014. A total of 643 injuries were identified, 559 (87.0%) were time-loss injuries. The overall injury incidence was 5.5 (95% confidence interval CI: 5.1–6.0), the incidence of time-loss injuries was 4.8 (95% CI: 4.4–5.2), the incidence of growth conditions was 1.2 (95% CI: 1.0–1.4) and incidence of serious injuries was 0.6 (95% CI: 0.5–0.8) per 1000?h of exposure. The prevalence of overuse injuries was 50.3%. Growth conditions represented 20.0%. Most of the injuries (67.0%) involved the lower extremities, and both foot and ankle were the most predominant injured body parts (22.0%). Knee injuries were mostly from overuse (50 vs. 23, p?=?.02), whereas foot and ankle injuries resulted from an acute mechanism (94 vs. 31, p?<?.0001). Minor and moderate injuries accounted for 87.0%. Muscle, tendon and osteochondrosis injuries accounted for 52.0% of all injuries. Comparing groups, squash sport was having the highest injury incidence (8.5 injuries per athlete). Higher exposure was associated with greater overuse relative risk (RR?=?1.03, 95% CI: 1.01–1.014, p?<?.001). In conclusion, the results of this study identified a high incidence of injuries in this youth sports population. Striking was the prevalence of overuse injuries of 50%, which suggests the need for injury prevention protocols for adolescent highly trained athletes. 相似文献
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主要研究了多带工作的特性,并通过设计矩形贴片微带天线--包含不同数目的并放置在两辐射端的槽, 进行分析. 分析基于MOM仿真软件包, 结论表明一个贴片上有3个槽的天线具有多带特性: 4个振荡频率分别在1. 6, 1. 8, 2. 65, 和4. 83 GHz, 并且具有足够的反射损耗和增益值. 同时证明了带有2对槽的贴片天线(槽分别位于两辐射端)有双带特性, 其振荡频率分别在1. 64和1. 8 GHz, 而且返回损耗和增益值很好. 相似文献
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While a great many studies have dealt with medieval poetry, they have failed to discuss the poetry of longing (?anīn) as a separate genre, independent of other genres, especially elegies (in particular poems that lament the fate of cities) and poems of salvation and lament. Nor has any study so far undertaken a comparison between works of this genre by Muslim and by Jewish poets.In this article, we shall discuss the growth of the poetry of longing in Muslim Spain and provide a number of examples of verses composed by Muslim and Jewish poets who were born in the cities of Andalusia and shared a common fate: many of them were persecuted for a variety of reasons and forced into a life of wandering and exile, and suffered banishment, imprisonment and torture. The ways they expressed their longing for their native cities possessed similarities but also differences, depending on the way each such poet perceived the land of the west and the scenes of his native city. The differences were particularly marked with respect to the way Jewish poets viewed the cities in which they had been born. 相似文献
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The aim of this study was to examine the time-course of and the relationships between muscle oxygenation, blood volume and myoelectrical manifestations during isometric exercise in children. Twelve healthy children aged 12.5 +/- 1.2 years (mean +/- s) performed an isometric knee extension at 50% of their maximal voluntary contraction (MVC) until exhaustion to assess endurance time (limit time, T(lim)). Changes in muscle oxygenation and blood volume were assessed by near infrared spectroscopy (NIRS). The root mean square (RMS) amplitude and the mean power frequency (MPF) from electromyogram (EMG) signals were obtained, as NIRS parameters, from the vastus lateralis. Mean T(lim) was 117 +/- 34 s. The muscle oxygenation and blood volume curves decreased immediately at the beginning of exercise. Maximal deoxygenation occurred at 50% T(lim), and fell by 76.9% from the resting value. Similarly, minimal blood volume was observed at 50% T(lim); it reached a plateau that lasted until the end of exercise. The kinetics of the MPF and RMS curves were inversely related to time. At the last set of exercises (after 75% T(lim)), a steeper RMS curve and an abrupt decrease in the MPF curve were observed. Significant correlations (r) between muscle oxygenation, blood volume, root mean square amplitude and mean power frequency were observed, which ranged from 0.72 to 0.99. These findings suggest that the fatigue resulting from sustained isometric exercise is related to a decrease in oxygenation and blood volume. 相似文献
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Abdallah Salem Farhan Almahaireh Anas Saleh Rabi Aldalaeen Suhib Khaled Ahmad Takhaineh 《International journal for the advancement of counseling》2018,40(2):173-186
The purpose of this study was to investigate the efficacy of a preventive counseling program for improving psychological hardiness (PsyH) and the positive use of social network sites (SNSs). The sample consisted of 30 students from Mu’tah University in Jordan who were randomly assigned into either an experimental group (15) or a control group (15). Two constructed scales - the PsyH scale and the Positive Use of SNSs scale - were administered to both groups pre-test and post-test, and a one-month follow-up measure was also administered to the experimental group. The findings revealed that the preventive counseling program significantly improved the level of PsyH and the positive use of SNSs and seemed to have sustained efficacy. 相似文献
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Mahmoud M. S. Abdallah 《Educational Action Research》2017,25(3):420-437
Action research (AR) – as a participatory, problem-oriented methodology – has been employed recently in Egypt to resolve complicated classroom and learning problems, and provide context-based solutions. Simultaneously, new ‘special education’ courses have been included recently in the university bylaws of Egyptian colleges of education. This imposes challenges, especially on course design and content selection. The present study therefore aimed at negotiating and improving the structure and delivery of a new special education language-learning course entitled ‘TESOL/TEFL for Special Needs’ taught to English majors (English as a foreign language [EFL] student-teachers) at Assiut University College of Education, and reaching a final framework. Therefore, an AR methodology of two cycles was employed with two different groups of English majors throughout two successive semesters during the academic year 2012/13: the first group included 106 junior general-section EFL student-teachers (first semester, 2012); and the second group consisted of 51 senior primary-stage EFL student-teachers (second semester, 2013). Data collection tools were used for both formative and summative evaluation purposes, and thus varied both at the initial stage and during iterations. They included questionnaires, online diaries, semi-structured interviews, final feedback reports and follow-up logs. The two AR cycles resulted in a final framework of course structure/content along with some suggestions and guidelines on how to deliver it. Moreover, some implications for teaching EFL to students with special educational needs as well as some conclusions related to using AR in Egypt to resolve many teaching/learning problems were presented. 相似文献
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Abdallah Hady Al-Kahtany 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1996,42(6):547-562
This paper examines the impact of two major approaches to literacy programs — the linguistic and the sociolinguistic. The principal difference between the two perspectives is that the linguistic negates the importance of sociological and ethnographic factors in a person's attaining literacy, while the sociolinguistic magnifies these influences. From one viewpoint, literacy is seen as cracking a linguistic code, while from the other, in Freire's (1987) phrasing, reading the world is necessary before reading the word. Academic/cultural literacy and functional literacy are examined as types affiliated with the linguistic perspective. Types of ethnographic literacy programs are analyzed to show their sociolinguistic orientation. The last section of the paper examines the language planning consequences of which perspective a country adopts and focuses on some recent literacy programs in Peru which incorporate elements of both the linguistic and sociolinguistic perspectives.
Zusammenfassung Dieser Artikel untersucht den Einfluß zweier Ansätze zu Alphabetisierungsprogrammen — den linguistischen und den soziolinguistischen. Der Hauptunterschied zwischen beiden Perspektiven liegt darin, daß die linguistische die Bedeutung soziologischer und ethnologischer Faktoren beim lernen verneint, während die soziolinguistische Perspektive diese Einflüsse unterstreicht. Eine Seite versteht unter Lese- und Schreibfähigkeit die Lösung eines linguistischen Codes, während die andere Seite mit Freires (1987) Worten gesprochen, Lesen der Welt in seiner Wichtigkeit vor Lesen des Wortes stellt. Akademische/kulturelle Schreib-u. Lesefähigkeit und funktionelle Schreib- u. Lesefähigkeit werden als Beispiele untersucht, die eng mit der linguistischen Perspektive verbunden sind. Ethnographische Alphabetisierungsprogramme werden in ihrer soziolinguistischen Orientierung analysiert. Der letzte Teil des Artikels setzt sich mit den Folgen für Sprachprogramme auseinander, in Bezug zur eingenommenen Perspektive. Der Artikel konzentriert sich auf einige Alphabetisierungsprogramme in Peru, die beide Perspektiven einbeziehen.
Resumen El trabajo examina el impacto de dos importantes enfoques de programas de alfabetización: el lingüístico y el sociolingüístico. La principal diferencia entre ambas ópticas reside en que la lingüística niega la importancia que revisten los factores sociológicos y etnográficos para la persona que está aprendiendo a leer y a escribir, mientras que la sociolingüística magnifica estas influencias. Desde un punto de vista, la alfabetización es considerada como la solución del código lingüístico, mientras que desde el otro, según las palabras de Freire (1987), se sostiene que antes de reading the word (leer la palabra) será necesario reading the world (interpretar el mundo). Estudia la alfabetización académico-cultural y la alfabetización funcional como disciplinas asociadas a la óptica de la lingüística. Analiza tipos de programas etnográficos de alfabetización para mostrar su orientación sociolingüístca. La última parte del trabajo examina las consecuencias de la planificación del lenguaje según la perspectiva que un país adopta, y enfoca algunos programas de alfabetización recientes del Perú, que incorporan elementos tanto de la óptica lingüística como de la sociolingüístic.
Résumé Cet article étudie l'incidence des deux principaux modes d'approche des programmes d'alphabétistion, l'un linguistique et l'autre sociolinguistique. La différence principale entre ces deux perspectives est la suivante: La linguistique nie l'importance des facteurs sociologiques et ethnographiques dans le processus d'alphabétisation d'une personne, alors que la sociolinguistique amplifie ces facteurs d'influence. La première considère l'alphabétisation comme le décryptage d'un code linguistique, pour la seconde, selon l'expression de Freire (1987), il faut lire le monde avant de lire le mot. Les formes d'alphabétisation dites académique, culturelle et fonctionnelle sont présentées comme appartenant à l'optique linguistique. Des programmes d'alphabétisation ethnographique sont également examinés pour en montrer l'orientation sociolinguistique. La dernière partie de l'article analyse les conséquences sur la planification linguistique quand un pays adopte l'une ou l'autre conception, et termine par la présentation de quelques récents programmes d'alphabétisation au Pérou, qui intègrent des éléments à la fois linguistiques et sociolinguistiques.
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Abdallah Moubayed Mohammadnoor Injadat Abdallah Shami Hanan Lutfiyya 《The American journal of distance education》2020,34(2):137-156
ABSTRACT E-learning platforms and processes face several challenges, among which is the idea of personalizing the e-learning experience and to keep students motivated and engaged. This work is part of a larger study that aims to tackle these two challenges using a variety of machine learning techniques. To that end, this paper proposes the use of k-means algorithm to cluster students based on 12 engagement metrics divided into two categories: interaction-related and effort-related. Quantitative analysis is performed to identify the students that are not engaged who may need help. Three different clustering models are considered: two-level, three-level, and five-level. The considered dataset is the students’ event log of a second-year undergraduate Science course from a North American university that was given in a blended format. The event log is transformed using MATLAB to generate a new dataset representing the considered metrics. Experimental results’ analysis shows that among the considered interaction-related and effort-related metrics, the number of logins and the average duration to submit assignments are the most representative of the students’ engagement level. Furthermore, using the silhouette coefficient as a performance metric, it is shown that the two-level model offers the best performance in terms of cluster separation. However, the three-level model has a similar performance while better identifying students with low engagement levels. 相似文献
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