THE CHARACTERISTICS. BEHAVIOUR AND HETEROGENEOUS CHEMICAL REACTIVITY OF ESTUARINE SUSPENDED PARTICLES

Natural Environment Research Council Institute for Marine Environmental Research Prospect Place, The Hoe. Plymouth. U.K. PL1 3D

Editorial. Sports Geography : an overview

Geographical studies of sports are not new. The first time that sport was mentioned in a geographical publication was in 1879 when Elisée Réclus said something about cricket in his Géographie Universelle. In 1919 Hilderbrand published in the National Geographic Magazine The Geography of Games. A few years later in 1927, the German geographer Hettner (quoted in Elkins, 1989) suggested that among other things, the variations in health, hygiene, recreation and education could be “apprehended as ..

The Effects of Game Size on the Physical Activity Levels and Ball Touches of Elementary School Children in Physical Education

The purpose of this study was to determine the impact of participating in small (3v3), medium (6v6), and large-sided (12v12) games on the physical activity levels (pedometer step counts, accelerometer counts, and minutes of moderate-to-vigorous physical activity) and ball touches of children in physical education class. Participants were 29 students (55% boys and 45% girls) age 10-11 yrs. All participants wore a Yamax SW-200 pedometer and had their ball touches monitored and recorded. Twelve participants also wore an ActiGraph GT3X accelerometer. Repeated measure ANOVAs were computed to test for significant differences for each dependant variable with corresponding post hoc tests. Results indicated the 3v3 and 6v6 game conditions yielded significantly higher accelerometer counts and ball touches than the 12v12 condition. The 3v3 game condition also produced significantly higher ball touches than the 6v6 condition. These findings highlight the importance of utilizing smaller-sided games in physical education to promote increased involvement and physical activity

Steder med appel

Artiklen beskriver forfatternes rejse i England i billeder og tekst

Editorial. Sports Geography : an overview

Geographical studies of sports are not new. The first time that sport was mentioned in a geographical publication was in 1879 when Elisée Réclus said something about cricket in his Géographie Universelle. In 1919 Hilderbrand published in the National Geographic Magazine The Geography of Games. A few years later in 1927, the German geographer Hettner (quoted in Elkins, 1989) suggested that among other things, the variations in health, hygiene, recreation and education could be “apprehended as ..

Steder med appel

Artiklen beskriver forfatternes rejse i England i billeder og tekst

High-Q Tuneable 10-GHz Bragg Resonator for Oscillator Applications

This paper describes the design, simulation, and measurement of a tuneable 9.365-GHz aperiodic Bragg resonator. The resonator utilizes an aperiodic arrangement of non (λ/4) low-loss alumina plates (εr = 9.75, loss tangent of 1×10−5 to 2 × 10−5) mounted in a cylindrical metal waveguide. Tuning is achieved by varying the length of the center section of the cavity. A multi-element bellows/probe assembly is presented. A tuning range of 130 MHz (1.39%) is demonstrated. The insertion loss S21 varies from −2.84 to −12.03 dB while the unloaded Q varies from 43 788 to 122 550 over this tuning range. At 10 of the 13 measurement points, the unloaded Q exceeds 100 000, and the insertion loss is above −7 dB. Two modeling techniques are discussed; these include a simple ABCD circuit model for rapid simulation and optimization and a 2.5-D field solver, which is used to plot the field distribution inside the cavity