A Study of Certain Factors in Their Relation to the Play of Children     

D. B. Van Dalen 《Research quarterly for exercise and sport》2013,84(4):279-290

  相似文献   

Central Circulatory Adaptations to Physical Training     

Peter J. Van Handel  David L. Costill  Leroy H. Getchell 《Research quarterly for exercise and sport》2013,84(4):815-823

Abstract

The bradycardia effect of a 10-week jogging program was studied in 13 previously sedentary middle-aged subjects (seven women and six men). This response during standardized submaximal treadmill walking and leg cycling was related to changes in cardiac output ([Qdot]), stroke volume (SV), and arteriovenous oxygen differences (a-vO₂ diff). Heart rate (HR) response was also studied during load carrying and arm cycling tasks, and a [Vdot]O₂ max test was administered. All tests were repeated posttraining. The posttraining increases in [Vdot]O₂ max (ml/kg × min^-1) were 19.7% and 14.8% for the men and women respectively. Training also produced significant reductions in submaximal HR and Q during treadmill and leg cycling exercise. A-vO₂ diff rose, while there were no changes in [Vdot]O₂ during the submaximal work tasks, suggesting either altered blood flow or a greater capacity to utilize O₂ by the working muscle. Both men and women showed significant reductions in HR during the arm cycling and load carrying as well. These data suggest that a jogging program can alter cardiovascular function in tasks other than running. The magnitude and direction of change showed no sex differences; therefore, it was also concluded that there are no differences in the trainability of previously sedentary middle-aged men and women.  相似文献   

Transfer of solutions to conditional probability problems: effects of example problem format,solution format,and problem context     

Alan F. Chow  James P. Van Haneghan 《Educational Studies in Mathematics》2016,93(1):67-85

  相似文献   

The burdens of proof     

Glen Van Brummelen 《Metascience》2016,25(2):243-245

  相似文献   

Connecting the continuum: a university-based induction program to improve teacher quality     

Laura Van Zandt Allen 《Teacher Development》2014,18(1):65-80

The Summer Curriculum Writing Institute (SCWI) supports graduates of a university-based teacher education program during the induction years and beyond with the aim of impacting teacher quality. The purpose of this article is to describe the development, goals, research, and lessons learned during SCWI from 2005–12. The week focuses around the central task of curriculum development, building on foundations learned during preservice education, and includes opportunities for ongoing learning and reconnecting with cohort members. Studies of the program highlight five key aspects of the week – curriculum writing, time, maintaining and expanding professional networks, teacher efficacy, and teacher retention. Participants have shown increases in curriculum quality as well as classroom teaching retention rates. As numbers of participants continue to grow, SCWI appears a sustainable model for universities to continue supporting graduates during the induction years and beyond.  相似文献   

Testing the predictive power of executive functions,motivation, and input on second language vocabulary acquisition: a prospective study     

Van Mensel  Luk  Galand  Benoît 《European Journal of Psychology of Education - EJPE》2023,38(2):475-494

European Journal of Psychology of Education - This longitudinal study assessed the relative importance of second language exposure, motivational and attitudinal factors, and executive functions in...  相似文献   

Hybrid sliding mode observer for switched linear systems with unknown inputs     

Jeremy Van Gorp  Michael Defoort  Kalyana C. Veluvolu  Mohamed Djemai 《Journal of The Franklin Institute》2014

This paper addresses the state observation and unknown input estimation of a class of switched linear systems with unknown inputs. This class of systems may have modes in which the state is not fully observable. A state transformation allows implementing two suitable reduced-order observers. The first one, based on second order sliding mode techniques, is proposed to reconstruct the discrete state in the presence of unknown inputs. The second one, based on gathering partial information from individual modes of the switched system and on higher order sliding mode techniques, is introduced to estimate the continuous state. Then, the observer injection signal of the first second order sliding mode observer is used to estimate the unknown inputs. Simulation results highlight the efficiency of the proposed method.  相似文献   

Incorporating technical risk in compound real option models to value a pharmaceutical R&D licensing opportunity     

D. Cassimon  M. De BackerP.J. Engelen  M. Van Wouwe  V. Yordanov 《Research Policy》2011,40(9):1200-1216

The valuation of multi-staged pharmaceutical R&D can be interpreted as a chain of real options. In valuing these compound option models, a crucial problem is how to deal with the different types of risk. Previous models, such as Cassimon et al. (2004), offer a closed-form solution for the valuation of a new drug development using a generalized n-fold compound option model, but implicitly bundle both commercial and technical risk in one risk measure. We extend this model by explicitly incorporating technical risk, while still preserving the closed-form solution of the model. As such, this extended model is better suited to handle real-life valuation cases in the pharmaceutical industry. We document the theoretical model with a real-life project of a major pharmaceutical multinational.  相似文献   

The level of awareness and understanding of copyright laws and policies among academic librarians in Ghana     

Theresa L. Adu  Thomas B. Van der Walt 《The Journal of Academic Librarianship》2021,47(3):102317

Awareness and understanding of copyright laws are critical in the proper administration of copyright in academic libraries. Data from 38 library staff and 4 head librarians was used in a sequential explanatory mixed methods approach to assess the level of awareness and understanding of copyright laws among library staff with regards to balancing user rights with rightsholder rights in academic libraries in Ghana. The data was collected using questionnaires and qualitative interviews. Though awareness of all the copyright laws, which was not influenced by the educational status of staff was high, the level of understanding was lower. Work experience, schedule of work and current position of staff significantly influenced the level of understanding. The generally moderate level of understanding of copyright laws for library staff; particularly for fair use and creative commons licensing, is a worrying development for copyright administration in academic libraries in Ghana.  相似文献   

Teacher use of the interactive whiteboards in Flemish secondary education—mapping against a transition framework     

Stijn Van Laer  Gary Beauchamp  Jozef Colpaert 《Education and Information Technologies》2014,19(2):409-423

Interactive Whiteboards (IWBs) are a relatively new, but increasingly more common, tool in the classrooms of Flemish Secondary schools. This paper reports on research which attempted to map not only the amount of IWB use in Flemish secondary schools but, perhaps more importantly, to assess how they are used and the progress of teachers in developing their IWB skills in the classroom. An online quantitative survey was conducted, based on a detailed IWB transition framework. The survey (n?=?433) identified the distribution and usage levels of the IWB by teachers in Flemish Secondary Education. The results show that the distribution of IWBs is affected by the educational network to which a teacher belongs. In terms of the level of IWB use, teachers classified themselves predominantly in the first two stages of the transition framework (Black/Whiteboard Substitute and Apprentice use). This would suggest that teachers in Flemish Secondary Education have been initiated (in a technological sense) in using the IWB and are beginning to initiate (in a pedagogic sense) wider usage, including incorporating pupil use of the IWB. In this process, however, teachers appeared to be more confident in technical use of the ICT skills, but less confident in developing new pedagogic approaches which may exploit the full potential of the IWB.  相似文献