Ethyl Silicate for Unbaked Earth Tablets Conservation: Evaluation of the Physico-mechanical Aspects     

Mathilde Tiennot  Jean-Didier Mertz  Ann Bourgès  Anne Liégey  Atika Chemmi  Anne Bouquillon 《文物保护研究》2020,65(5):285-295

ABSTRACT

Preservation of cuneiform tablets made with clay minerals is an ongoing conservation issue. A treatment based on TEOS consolidation has been used since 1996 at the Louvre museum. The characterization of the tablets pointed out kaolinite, illite, and smectite as the three main clay minerals constituting the objects. In this research, the physico-mechanical aspects of the treatment are investigated. The penetration depth of the TEOS solution and the gradient induced are quantified using laboratory samples. TEOS treatment preserves the macroscopic swelling and the vapour transfer properties, but modifies the clay’s affinity to moisture. Elastic properties are gradually improved for all clays, but only kaolinite’s strength increases significantly. The impact of TEOS treatment on the natural behaviour related to the respective structure of the clays is considered, and the amount of kaolinite required to create adequate reactions appears to be of interest for conservation treatments.  相似文献   

Nutritional intake and body composition changes in a UCI World Tour cycling team during the Tour of Spain     

José Joaquín Muros  Cristóbal Sánchez-Muñoz  Jesús Hoyos  Mikel Zabala 《European Journal of Sport Science》2019,19(1):86-94

Abstract

The aim of this study was to quantify the food intake of an International Cyclist Union (UCI) World Tour professional cyclist team and to analyse changes in body composition during the Tour of Spain. Nine male professional road cyclists (31.3?±?3.0 years) volunteered to participate in the study. Nutritional data were collected each day throughout the 3-week Tour by two trained investigators who weighed the food ingested by the cyclists. Mean nutritional intake of the cyclists was as follows: carbohydrate, 12.5?±?1.8?g/kg/day of body weight (BW) (65.0?±?5.9%); fat, 1.5?±?0.5 g/kg/day BW (17.9?±?5.6%); and protein, 3.3?±?0.3?g/kg/day BW (17.1?±?1.6%). Intake of all micronutrients, except for folate, vitamin D and potassium (which were 78.7%, 46% and 84% of Recommended Dietary Allowances (RDA), respectively), exceeded the RDA. Height, weight, skinfolds, circumferences and diameters were taken following the guidelines outlined by the International Society for the Advancement of Kinanthropometry. Body density, body fat percentage, muscle mass, total muscle mass and fat mass of the arms and thighs were calculated. Percentage body fat, fat mass and upper arm fat mass significantly decreased (p < .05) after the Tour independent of the equation method used in the calculations. Total muscle mass remained unchanged. Generally, this sample of cyclists consumed more protein and less fat than the recommended amount and had low weight, BMI and fat mass. It is suggested that sports nutritionists design personalised diets in order to maintain a correct proportion of nutrients as well as controlling possible anthropometrical changes that could affect performance.  相似文献   

Here is something you can't understand: the suffocating whiteness of communication studies     

Lisa B. Y. Calvente  Bernadette Marie Calafell  Karma R. Chávez 《传播与批判/文化研究》2020,17(2):202-209

ABSTRACT

The authors utilize a modernity-coloniality framework to highlight practices of whiteness and white dominance within the academy and the field of communication studies in particular. The article grounds its framework in personal experience and theories in the flesh to build comradery with feminist of color scholarly forebears and to share with those who struggle to create spaces of change within the academy today and in the future. The authors advocate for an active consciousness of “included exclusion” as the first step toward decolonization. Decolonizing discursive and embodied knowledges creates avenues for social justice and change within the academy and beyond.  相似文献   

An Index to Evaluate the Journals and Publishers’ Information Sharing Capacity     

Wurong Shih  Julián Nevárez Montes 《Publishing Research Quarterly》2018,34(4):529-539

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Aerobic fitness and academic achievement: A systematic review and meta-analysis     

Celia Álvarez-Bueno  Charles H Hillman  Mairena Sánchez-López  Diana P. Pozuelo-Carrascosa  Vicente Martínez-Vizcaíno 《Journal of sports sciences》2020,38(5):582-589

ABSTRACT

This study aims to quantify the association between aerobic fitness and academic achievement, and determine how different aerobic fitness tests and individual demographic characteristics may modify this association. It includes 41 cross-sectional and 7 longitudinal studies focusing on children and adolescents, from MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, Cochrane Database and Web of Science. Pooled effect sizes (ES) were estimated for the association between aerobic fitness and specific domains of academic achievement. Subgroup analyses and meta-regressions were based on aerobic fitness tests and demographic characteristics. The ES for the association between aerobic fitness with language/reading-skills, mathematics-related skills and composite scores, were 0.23 (95% CI: 0.12; 0.34); 0.27 (95% CI: 0.19; 0.36) and 0.28 (95% CI: 0.12; 0.45), respectively. Subgroup analyses by aerobic fitness test modified these associations; additionally, analyses by sex or age showed differences between boys and girls as well as between children and adolescents. Finally, meta-regressions revealed a slight effect of body mass index on these associations. Cardiorespiratory fitness is positively associated with academic achievement. Associations were dependent on demographic and aerobic fitness test characteristics, being stronger in boys than in girls, and in children than in adolescents.

Systematic review registration: PROSPERO CRD42017069677  相似文献   

Information behaviour of the millennial generation: a scoping review of medical residents and their use of social media     

Aurora Gonzlez‐Teruel  María‐Isabel Campos‐Pelez  Gerardo Fortea‐Cabo 《Health information and libraries journal》2021,38(1):5-31

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A Developmental Study of the Self-Prioritization Effect in Children Between 6 and 10 Years of Age     

Hélène Maire  Renaud Brochard  Daniel Zagar 《Child development》2020,91(3):694-704

Self-biases are well described in adults but remain poorly understood in children. Here, we investigated in 6–10 year-old children (N = 132) the self-prioritization effect (SPE), a self-bias which reflects, in adults, the perceptual advantage for stimuli arbitrarily associated with the self as compared to those associated with other persons. We designed a child-friendly adaptation of a paradigm originally introduced in adults by Sui, He, and Humphreys (2012) in order to test whether the SPE also occurs in children and if so, to determine its evolution with age. A robust SPE was obtained from the age of 6, and this effect was similar-sized in our four age groups. These findings are discussed with reference to the development of the self during childhood.  相似文献   

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   

French Adaptation of the Short Form Youth Experiences Survey for Sport and Life Skills Scale for Sport     

Camille Sabourin  Christiane Trottier  Eric Frenette  Martin Camiré  Vicky Drapeau  Claude Goulet 《Measurement in physical education and exercise science》2020,24(1):33-48

ABSTRACT

Research on positive youth development and life skills in sport has gained considerable attention over the past decades. However, there is a lack of translated questionnaires examining youth development and life skills available to non-English researchers and practitioners. The purpose of this research project was to adapt in French two questionnaires and to accumulate validity evidence of these adaptations. The short form – Youth Experiences Survey for Sport and the Life Skills Scale for Sport were adapted using a procedure based on a transcultural validation methodology applied to psychological measures. This research comprises four studies, which led to the French adaptation and validation process of each questionnaire. In conclusion, the results obtained show that these adapted French questionnaires can now be used to evaluate the perceptions and lived experiences of French-speaking athletes regarding positive youth development and life skills in sport.  相似文献   

The global reception of John Dewey's thought. Multiple refractions through time and space     

Béatrice Haenggeli-Jenni 《比较教育学》2014,50(2):252-254

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