Learning in Agriculture: Rural Development Agents in France Caught between a Job Identity and a Professional Identity     

Christophe Albaladejo  Nathalie Couix  Laurence Barthe 《The Journal of Agricultural Education and Extension》2013,19(2):95-106

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Needs of thermodynamic properties measurements and modeling in the frame of new regulations on refrigerants     

COQUELET Christophe RICHON Dominique 《浙江大学学报(A卷英文版)》2007,8(5):724-733

In 1987, the Montreal Protocol prohibited the worldwide use and production of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) and hydro fluorocarbons (HFCs) were proposed as alternative refrigerants. Unfortunately, HFCs have non negligible global warning potential and therefore new refrigerants must be proposed or old refrigerants must be used associated with HFC. Accurate experimental thermodynamic data and predictive techniques are required for better under-standing of the performance of the newly proposed refrigerants. In this communication, experimental techniques based on either analytic or synthetic methods are first described. Data are reported. Then two newly developed predictive models based on thermodynamic approach with the isofugacity criterion and artificial neural network method are presented. The results can provide better evaluation of refrigerants, especially with the aim of studying global warning effects.  相似文献   

A pilot study on quantification of training load: The use of HRV in training practice     

Damien Saboul  Pascal Balducci  Grégoire Millet  Vincent Pialoux  Christophe Hautier 《European Journal of Sport Science》2016,16(2):172-181

Recent laboratory studies have suggested that heart rate variability (HRV) may be an appropriate criterion for training load (TL) quantification. The aim of this study was to validate a novel HRV index that may be used to assess TL in field conditions. Eleven well-trained long-distance male runners performed four exercises of different duration and intensity. TL was evaluated using Foster and Banister methods. In addition, HRV measurements were performed 5 minutes before exercise and 5 and 30 minutes after exercise. We calculated HRV index (TL_HRV) based on the ratio between HRV decrease during exercise and HRV increase during recovery. HRV decrease during exercise was strongly correlated with exercise intensity (R = ?0.70; p < 0.01) but not with exercise duration or training volume. TL_HRV index was correlated with Foster (R = 0.61; p = 0.01) and Banister (R = 0.57; p = 0.01) methods. This study confirms that HRV changes during exercise and recovery phase are affected by both intensity and physiological impact of the exercise. Since the TL_HRV formula takes into account the disturbance and the return to homeostatic balance induced by exercise, this new method provides an objective and rational TL index. However, some simplification of the protocol measurement could be envisaged for field use.  相似文献   

法国的医学教育   总被引：3，自引：0，他引：3  

Christophe Segouin  梅人朗 《复旦教育论坛》2007,5(5):85-88

在过去10年中,法国的卫生保健和医学教育制度已进行了很大的改革.本文调查了法国的医学课程、医学生的选择、执照颁发和继续医学教育,并讨论了法国医学院校面临的挑战.  相似文献   

Student adjustment to higher education: the role of alternative educational pathways in coping with the demands of student life     

Rebecca Shankland  Christophe Genolini  Lionel Riou França  Julien-Daniel Guelfi  Serban Ionescu 《Higher Education》2010,59(3):353-366

The present longitudinal study measured student adjustment to higher education, comparing 50 participants from alternative schools (Steiner, Montessori, New Schools) with 80 students from the traditional school system. We hypothesized that students from alternative schools adapt better, because of greater perceived social support, academic self-efficacy, and task-oriented coping styles. Measures were taken during the last school year (baseline characteristics), and at the beginning of the first and last terms of the first year in higher education. The quality of adjustment was assessed through academic results, and physical and psychological well-being. The following instruments were used: the State-Trait Anxiety Inventory by Spielberger (1983), the 13-items Depression Inventory by Beck et al. (1961), the Coping Inventory for Stressful Situations by Endler and Parker (1990), and semi-directed interviews. Results show that students from alternative schools adjust better to higher education: they report less anxiety and depression symptoms, and show greater life satisfaction and academic achievement.  相似文献   

Arm coordination and performance level in the 400-m front crawl     

Schnitzler C  Seifert L  Chollet D 《Research quarterly for exercise and sport》2011,82(1):1-8

The purpose of this study was to determine whether the Index of Coordination (IdC) and the propulsive phase durations can differentiate performance level during a maximal 400-m front crawl swim trial. Sixteen male swimmers constituted two groups based on performance level (G1: experts; G2: recreational). All participants swam the 400-m front crawl at maximal speed. Video analysis determined the stroke (swimming speed, stroke length, stroke rate) and coordination (IdC) parameters for every 50 m. Both stroke and coordination parameters discriminated performance level. The expert group had significantly higher values for speed and stroke length and lower values for the relative propulsive phase duration and IdC (p < .05). However there was no significant change in coordination parameters for either group throughout the trial. This suggests that, when associated with greater stroke length, catch-up coordination can be an efficient coordination mode that reflects optimal drag/propulsion adaptation. This finding provides new insight into swimmers' adaptations in a middle-distance event.  相似文献   

Joint power generation differentiates young and adult sprinters during the transition from block start into acceleration: a cross-sectional study     

Sofie Debaere  Christophe Delecluse  Dirk Aerenhouts  Friso Hagman  Ilse Jonkers 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(4):452-462

The aim of this study was to investigate differences in joint power generation between well-trained adult athletes and young sprinters from block clearance to initial contact of second stance. Eleven under 16 (U16) and 18 under 18 (U18) promising sprinters executed an explosive start action. Fourteen well-trained adult sprinters completed the exact same protocol. All athletes were equipped with 74 spherical reflective markers, while an opto-electronic motion analysis system consisting of 12 infrared cameras (250 Hz, MX3, Vicon, Oxford Metrics, UK) and 2 Kistler force plates (1,000 Hz) was used to collect the three-dimensional marker trajectories and ground reaction forces (Nexus, Vicon). Three-dimensional kinematics, kinetics, and power were calculated (Opensim) and time normalised from the first action after gunshot until initial contact of second stance after block clearance. This study showed that adult athletes rely on higher knee power generation during the first stance to induce longer step length and therefore higher velocity. In younger athletes, power generation of hip was more dominant.  相似文献   

The influence of trained peer tutoring on tutors' motivation and performance in a French boxing setting     

Legrain P  D'Arripe-Longueville F  Gernigon C 《Journal of sports sciences》2003,21(7):539-550

The aim of this study was to examine the potential motivational and behavioural benefits of two peer tutoring programmes for tutors in a sport setting. Differences between the sexes were also explored. Thirty two college-age males and females, all novices on a French boxing task, were assigned to a 2 x 2 [sex x training type: physical practice associated with trained peer tutoring (TPT) vs physical practice associated with untrained peer tutoring (UPT)] factorial design. All participants were given six French boxing lessons of 2 h each. The TPT programme included structured methods to prepare the participants to fulfil their role of tutors, whereas the UPT programme did not. The results demonstrated that the TPT programme resulted in higher scores for coaching skills. Furthermore, interaction effects revealed that the TPT programme yielded better offensive outcomes for males and better defensive outcomes for females. Although the UPT participants expressed higher self-efficacy, no differences emerged for intrinsic motivation and causal attributions. Finally, male tutors displayed higher self-efficacy and offensive outcomes than female tutors. The results are discussed in the light of previous findings in the educational and sport psychology literature.  相似文献   

Situational indexes of achievement motivation, help-seeking, and performance: influences of the learning context and gender differences     

Gernigon C  d'Arripe-Longueville F  Debove V  Puvis A 《Research quarterly for exercise and sport》2003,74(4):473-479

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Longitudinal links between maternal cultural socialization,peer ethnic-racial discrimination,and ethnic-racial pride in Mexican American youth     

Gabriela Livas Stein  N. Keita Christophe  Laura Castro-Schilo  Casandra Gomez Alvarado  Richard Robins 《Child development》2023,94(3):752-767

This paper used cross-lagged panel models to test the longitudinal interplay between maternal cultural socialization, peer ethnic-racial discrimination, and ethnic-racial pride across 5th to 11th grade among Mexican American youth (N = 674, M_age = 10.86; 72% born in the United States; 50% girls; Wave 1 collected 2006–2008). Maternal cultural socialization predicted increases in subsequent youth ethnic-racial pride, and youth ethnic-racial pride prompted greater maternal cultural socialization. However, peer ethnic-racial discrimination was associated with subsequent decreases in ethnic-racial pride. The magnitude of these associations was consistent across 5th to 11th grades suggesting that maternal cultural socialization messages are necessary to maintain ethnic-racial pride across adolescence, thus families must continually support the development of ethnic-racial pride in their youth to counter the effects of discrimination.  相似文献