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Zbigniew Semadeni 《Educational Studies in Mathematics》2008,68(1):1-17
To explicate certain phenomena, e.g., the possibility of deduction without definition, we hypothesize that an individual is
able to understand and appreciate reasoning with a due feeling of its necessity when the concept image of each concept involved
in the reasoning has reached a certain level of development; we then speak of deep intuition. This conception is presented (with a variety of examples) in the framework of D. Tall’s theory of three worlds of mathematics
(‘conceptual-embodied’, ‘proceptual-symbolic’, and ‘formal-axiomatic’).
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| Zbigniew SemadeniEmail: |
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Pawel Linek Pardis Noormohammadpour Mohammad Ali Mansournia Tomasz Wolny Damian Sikora 《运动与健康科学(英文)》2020,9(6):614-619
BackgroundMost papers examining the lateral abdominal muscles (LAMs) and low back pain (LBP) are cross-sectional, with groups of participants being divided into a control and an LBP group. We hypothesized that morphological measurements of the LAMs in adolescent soccer players may predict future LBP incidence. The aim of this study was to examine the associations between the morphology of LAMs and LBP incidence rate among adolescent soccer players.MethodsNinety-seven adolescent male soccer players with no LBP at baseline were recruited into the prospective cohort study. The thickness of the LAMs was measured at baseline by ultrasound imaging in a supine rest position. Nine cases of LBP occurred during the follow-up 6-month observation.ResultsAn obliquus internus (OI) asymmetry was related to increasing LBP risk (odds ratio = 19.99; 95%CI: 2.4–167.9). Spearman correlation also showed a linear relationship between OI asymmetry value and duration of LBP (R = 0.75, p = 0.02). An OI side-to-side difference greater than 1.25 mm suggests possible LBP incidence in the 6-month observation among adolescent soccer players.ConclusionThe morphological changes of the OI may be related to LBP’s incidence in adolescent soccer players. The presence of OI asymmetry increases the odds of LBP by at least 2.4 times. Hypertrophy of the OI on one side of the body may contribute to trunk muscle imbalance. 相似文献
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Wolanczyk-Medrala A Dor A Szczepaniak W Tomkowicz T Liebhart J Panaszek B Medrala W 《Journal of sports sciences》2008,26(13):1467-1471
A few studies have reported data on the prevalence of exercise-induced bronchospasm in high school and university athletes. Recently published data suggest that exercise-induced bronchospasm may affect up to 39% of American university athletes. To date, no data describing this pathology in athletes from Central Europe have been published. The aim of the present study was to establish the prevalence of exercise-induced bronchospasm in pupils attending sports mastership classes in secondary school as well as students of the University of Physical Education in Wroclaw. The participants were 77 athletes (30 women and 47 men) aged 16-27 years (mean 17.3 years). Only one athlete (1.29%) diagnosed with atopic asthma before testing experienced a fall in forced expiratory volume in one second (12.9% FEV(1)) compared with baseline, which showed that the exercise test result was positive. From a clinical point of view, the ventilation disturbance was asymptomatic. In the other participants, there were slight but statistically significant rises in FEV(1) (P < 0.02). The results of our study indicate a very low prevalence of exercise-induced bronchospasm in the population of athletes examined. 相似文献
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Tomasz Sawoszczuk Andrzej Bara&#x;ski Janusz Marek &#x;agan Tomasz &#x;ojewski Katarzyna Zi&#x;ba 《Journal of Cultural Heritage》2008,9(4):401-411
The ASTM D6819-02e3 standard for testing the accelerated ageing of paper, published in 2002, recommends using closed glass vials in order to keep the degradation products in contact with the paper and thus permitting a better simulation of the natural ageing conditions inside closed books. In the present study, the actual conditions and their stability inside closed vessels have been evaluated. The necessity of assuring a very high sealing performance (tightness) of the systems in order to avoid leakage of water vapour is the main drawback of this ageing method. Systematic studies presented in this publication tried to monitor this tightness and have provided data that helped to answer the question of what circumstances could lead to achieving its improvement. Both gravimetric monitoring of water content in vials and “in situ” IR measurements of the aged paper humidity have been applied for this purpose. As a result, better sealing materials (gaskets and caps) than those recommended by the ASTM standard, have been found. Additionally, application of a dynamometric spanner for closing the vials is recommended, as this is a guarantee of reasonably high and recurring tightness of the systems used in tests. Nevertheless, the systematic, linear with time, loss of moisture for all used vials was observed. A 9% loss of the initial moisture content in samples of the aged paper was observed for the tested conditions (14 days at 90 °C). Therefore, it seems that including some kind of gravimetric control for ageing tests performed in closed vessels is of essential importance.Kinetic studies of accelerated ageing in both closed and open systems, as monitored by DP and breaking length measurements, unexpectedly show that no statistically meaningful difference of degradation rates can be observed. On the other hand, the pH and whiteness index values reveal a meaningful difference between the rates of ageing in these systems, thus confirming the basic assumption of the ASTM test concerning the interaction of paper degradation products with the paper itself. 相似文献
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This article researches higher education (HE) managers’ perception of graduate professional success and higher education institutions’ (HEI) activity aimed at enhancing graduate employability. The issue is worth examining not only because of growing relative unemployment rates among HE graduates but also because it is a part of a heated discussion on the contemporary evolution of HEIs. We analysed 36 semi-structured interviews with representatives of HEIs offering studies in the field of science in six countries (Austria, Germany, Italy, Poland, Slovenia and Turkey). Our analysis showed that there are three approaches observed, depending to a large extent on the balance between different HE stakeholders within subdomains (triple-helix theory). Our results support the hypothesis of diversification of HEIs’ models varying from the traditional ivory-tower-type university (with a dominating role of academic oligarchy) to the market-oriented educational enterprise (where the business sector is a key driver of change). 相似文献
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Tomasz Kosicki 《上海大学学报(英文版)》2014,(1):54-60
This paper investigates how graph representation can be created for the mesh which is a discrete approximation of n-dimensional continuous space. The paper discusses the relationship between mesh dimensionality and the type and quantity of edges connecting each vertex with its neighbors. Basing on the analysis, a simple algorithm is also proposed to create such graph representation. The purpose of the graph is to search optimal paths and trajectories in the represented space. 相似文献