Global ETD Search

271	The impact of assessment on an English as a Foreign Language academic reading programme Schneider, Sue January 2000 (has links) No description available. 370
272	Debris Disks in Open Stellar Clusters Gorlova, Nadiya Igorivna January 2006 (has links) Indirect searches for planets (such as radial velocity studies)show that their formation may be quite common. The planets are however too small and faint to be seen against the glare of their host stars; therefore, their direct detectionis limited to the nearest systems. Alternatively one can study planets by studying their "by-product" -- dust. We see raw material available for planets around young stars, anddebris dust around old stars betraying planet-induced activity. Dust has a larger surface area per unit mass compared with a large body; it can be spread over a largersolid angle, intercepting more starlight and emitting much more lightvia reprocessing. By studying dusty disks we can infer the presence of planets at larger distances.Here we present results of a survey conducted with the SpitzerSpace Telescope of debrisdisks in three open clusters. With ages of 30--100 Myrs, these clusters are old enough that the primordialdust should have accreted into planetesimals, fallen onto the star, or been blown away due to a numberof physical processes. The dust we observe must come from collisions or sublimation of larger bodies.The purpose of this study is to investigate the dustevolution in the terrestrial planet zone, analogous to the Zodiacal cloud in our Solar system. We are most sensitive to this zone becausethe peak of a 125 K black body radiation falls into the primary pass-band of our survey -- 24 micron. We investigate the fraction and amount of the infra-red excesses around intermediate- to solar-mass stars in open stellar clusterswith well defined ages. The results are analyzed in the context of disk studies at other wavelengths and ages, providing an understanding of the time-scale for diskdissipation and ultimately planet building and frequency. solar system formation open clusters debris disks
273	Information and Communication Technology and Its impact on Open and Distance Learning Nirmal Ranjan Mazumdar 01 1900 (has links) The impact of ICT in open and distance learning is now become a common phenomenon. The rapid use of internet and other communication facilities have brought the open and distance education closer to the student community. The paper highlights the application of ICT in open and distance learning system of Assam. information and communication technology open and distance learning Assam
274	Sustainable income and the depletion of renewable and non-renewable resources Mason, Pamela Jill January 1999 (has links) No description available. 634.9
275	The weathering of gypsum and calcite and their role in the reclamation of soils from Al-Hassa Oasis, Saudi Arabia Al-Barrak, Khalid Mohamed January 2000 (has links) No description available. 631.4
276	Pictures of change : distance learning as an innovation in health sciences Morgan, Philip Arnold January 2001 (has links) No description available. 370
277	Leucocyte filtration and cardiac surgery Sheppard, Stuart Vincent January 1999 (has links) No description available. 610
278	Architecture and protocol for an infrared semi-permanent local network Manukulasuriya, Varuna January 1995 (has links) No description available. 621.3192 Optical communication; Open systems; LAN
279	OSIDEM : a demonstration of the transmission of open systems interconnection high level protocols Azizi, Davood January 1992 (has links) No description available. 621.3822 Data structure for open systems
280	Computer-aided study of multivariable nonlinear control systems Sadaoui, Nasser January 1994 (has links) No description available. 629.8 Hypertext; Open learning; Expert systems

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