A bridging study analyzing mathematical model construction through a quantities-oriented lens

Educational Studies in Mathematics - Mathematical modelling is endorsed as both a means and an end to learning mathematics. Despite its utility and inclusion as a curricular objective, one of many...     

Effects of different intensities of resistance training with equated volume load on muscle strength and hypertrophy

The present study investigated the effects of different intensities of resistance training (RT) on elbow flexion and leg press one-repetition maximum (1RM) and muscle cross-sectional area (CSA). Thirty men volunteered to participate in an RT programme, performed twice a week for 12 weeks. The study employed a within-subject design, in which one leg and arm trained at 20% 1RM (G20) and the contralateral limb was randomly assigned to one of the three conditions: 40% (G40); 60% (G60), and 80% 1RM (G80). The G20 started RT session with three sets to failure. After G20 training, the number of sets was adjusted for the other contralateral limb conditions with volume-matched. CSA and 1RM were assessed at pre, post-6 weeks, and post-12 weeks. There was time effect for CSA for the vastus lateralis (VL) (8.9%, 20.5%, 20.4%, and 19.5%) and elbow flexors (EF) (11.4%, 25.3%, 25.1%, and 25%) in G20, G40, G60, and G80, respectively (p?>?.05). G80 showed higher CSA than G20 for VL (19.5% vs. 8.9%) and EF (25% vs. 11.4%) at post-12 weeks (p?p?相似文献   

Ethical professional identity and the development of moral exemplar collegiate coaches

Coaches have the potential to influence athletes’ moral development, especially at the collegiate level—a powerful period of growth in young adults’ lives. As central agents in athlete moral education, coaches’ moral development and understanding of professionalism is currently unknown. The purpose of this study was to increase understanding of the ethical professional identity development of sport coaches. In-depth interviews based on moral exemplar and moral identity development theories were conducted with NCAA Division-I collegiate head coaches (n = 12) in the United States who were peer nominated ‘moral exemplars’. Interviews elicited themes of moral exemplarity, professionalism, and above average ethical identity development. Results can inform and improve coach education for current and future members of the profession.     

Alternative convergence criteria for iterative methods of solving nonlinear equations

Let χ_m+1=T(χ_m) or even χ_m+1=T(χ_m,χ_m?1, …, χ_m?q), m=1,2,3 … be an iteration method for solving the nonlinear problem F(χ)=0, where F(χ) and its derivatives possess all of the properties required by T(χ_m). Then if it can be established that for the problem at hand ∥F(χ_m+1)∥?β_m∥F(χ_m)∥, ? m > M₀ (M₀<∞) and 0?β_m<1 , definitions are established and theorems proven concerning convergence, uniqueness and bounds on the error after ‘m’ successive iterations of a new approach to convergence properties T(χ_m). These charateristics are referred to as “alternate” (local, global) convergence properties and none of the proofs given are restricted to any specific type of method such as, e.g. contraction mapping types. Application of results obtained are illustrated using Newton's method as well as the general concept of Newton-like methods.     

Latins and Georgians and the Crusader Kingdom

Partly because the First Crusade had weakened the Seljuk Sultanate in 1097–1099, David III of Georgia was able to extend his power over much of the Caucasus. The rulers of the Crusader States who stood in need of Eastern Christian allies sought to co-operate with him. Yet although some Western knights served in his army, the practical difficulties of co-ordinating joint action against the Islamic powers of north Syria and Anatolia in the twelfth century proved insuperable. In the thirteenth century the Georgian crown offered an alliance to the leaders of the Fifth Crusade: their forces would attack the northern provinces of the Ayyūbid Empire while the crusaders were invading Egypt. This strategy was sound, but the rise of the Mongol Empire prevented it from being implemented. Nevertheless, the desire for military collaboration between Georgia and the Western powers persisted until the mid-fifteenth century.     

Polluted lake restoration to promote sustainability in the Yangtze River Basin,China

China has sought to address water pol-lution in the last decade by introduc-ing a wide range of laws and regulations(Table S1),which led to nationwide water qua...     

Extending the theory of planned behavior: the role of self and social influences in predicting adolescent regular moderate-to-vigorous physical activity

The current study aimed to test the validity of an extended theory of planned behavior model (TPB; Ajzen, 1991), incorporating additional self and social influences, for predicting adolescent moderate-to-vigorous physical activity. Participants (N = 423) completed an initial questionnaire that assessed the standard TPB constructs of attitude, subjective norm, and perceived behavioral control, as well as past behavior, self-identity, and the additional social influence variables of group norms, family social support, friends' social support, and social provisions. One week after completion of the main questionnaire, participants completed a follow-up questionnaire that assessed self-reported physical activity during the previous week. The standard TPB variable--past behavior, self-identity, and group norms, but not social support influences--predicted intentions, with intention, past behavior, and self-identity predicting behavior. Overall, the results provide support for an extended version of the TPB incorporating self-identity and those social influences linked explicitly to membership of a behaviorally relevant reference group.