A synopsis of the weather problems facing today's general aviation pilots

Concentration on weather to data has primarily been at the point of observation. There have been efforts to obtain and disseminate en route weather through pilot reports (PIREPS), but the efforts have been meager. What is needed is the cooperative efforts on the application of technology to the acquisition and dissemination of the en route weather data for those pilots in the air as well as those who are flight planning on the ground. A comprehensive three-dimensional computer storage system is proposed that receives weather information from all aircraft on IFR flight plans and stores this information by altitude and geographic coordinates. Also, a report on the Federal Aviation Administration's Research Engineering and Development Aviation Weather Program from the aspect of past, present and future is given

Happy 21st birthday sport education: Where are we now?

The article focuses on the pros and cons of the Sport Education Curriculum (SEM) that is used in New Zealand. Comments made by former professional rugby player Chris Laidlaw show how important sport is to New Zealanders. Educator Daryl Siedentop believed that sport education was necessary and his play theory is analyzed

Sport and education: Sport in secondary schools for all or for some?

The place of sport in schools has always been controversial and struggled to gain legitimacy and acceptance as a part of the formal curriculum. While some commentators argue sport has no place in the curriculum, others claim it is too important to be left to chance and, like other aspects of education, it can and should be pursued for its own intrinsic value. For example, Siedentop (1982, p. 2) stated, 'if sport is equal to other ludic [movement] forms (art, drama, music and dance) both for the individual and the culture; and if more appropriate participation in sport represents a positive step in cultural evolution then sport in education is justified'. From another but still supportive perspective, Arnold (1997, p. I) claimed, 'sport is a trans-cultural valued practice ... and despite its corruption from time to time it is inherently concerned with concepts, ethical principles and moral values which are universally applicable and justified as a form of education

T-duality and U-duality in toroidally-compactified strings

We address the issue of T-duality and U-duality symmetries in the toroidally-compactified type IIA string. It is customary to take as a starting point the dimensionally-reduced maximal supergravity theories, with certain field strengths dualised such that the classical theory exhibits a global $E_{n(n)}$ symmetry, where n=11-D in D dimensions. A discrete subgroup then becomes the conjectured U-duality group. In dimensions D\le 6, these necessary dualisations include NS-NS fields, whose potentials, rather than merely their field strengths, appear explicitly in the couplings to the string worldsheet. Thus the usually-stated U-duality symmetries act non-locally on the fundamental fields of perturbative string theory. At least at the perturbative level, it seems to be more appropriate to consider the symmetries of the versions of the lower-dimensional supergravities in which no dualisations of NS-NS fields are required, although dualisations of the R-R fields are permissible since these couple to the string through their field strengths. Taking this viewpoint, the usual T-duality groups survive unscathed, as one would hope since T-duality is a perturbative symmetry, but the U-duality groups are modified in D\le 6.Comment: Latex, 21 pages. References and discussion adde