T IO N A L — a m onth ly pub lica tion conta in ing synopses o f dissertations, also available in the library: D A T R IX II Search Service — a computerized, m ail-o rder system which w ill prepare, in response to yo u rin d iv id u a l inquiry, an interdisciplinary list o f disser­ tations related to yo u r topic: Xerox University M icro film s' dissertation p ub lish ­ ing service, which w il...

We present a newly developed 4500 V and 2000 A Press-Pack IGBT module for power transmission and industrial voltage drives applications. The module employs SPT IGBT chips with exceptionally low losses and high Safe Operating Area (SOA). The use of SPT IGBT chips in this Press Pack IGBT module allows for higher power densities and the package provides a highly flexible modular platform with very...

Protected areas in Thailand were first established 40 years ago. The total area of existing protected areas covers 18.2% of the country's land area and the Class 1 Watershed, another form of protection, encompasses 18.1%. The government of Thailand intends to increase protected area systems to 25% of the country in 2006 and 30% in 2016. There are always questions arising about how much is enoug...

this paper aims to detect occurred changes in vegetation cover of forested helen protected area using extracted ndvis from bi-temporal multispectral images of landsat tm. to do so, at first forest areas with low and moderate density cover were identified and separated on land use map. then preprocessing applications including radiometric corrections were done on both 1990 and 2009 images. also ...

biodiversity is an important component in sustainability assessment of agroecosystems. along with increasing or decreasing of biodiversity, ecosystem services in agroecosystems will be varied. agricultural experts take into account different factors which affect agroecosystems variation. in this study, farming systems of two areas including a protected mountainous area and also a plain – hilly ...

Global efforts to reduce tropical deforestation rely heavily on the establishment of protected areas. Measuring the effectiveness of these areas is difficult because the amount of deforestation that would have occurred in the absence of legal protection cannot be directly observed. Conventional methods of evaluating the effectiveness of protected areas can be biased because protection is not ra...

Over the past decades, a number of national policies and international conventions have been implemented to promote the expansion of the world's protected area network, leading to a diversification of protected area strategies, types and designations. As a result, many areas are protected by more than one convention, legal instrument, or other effective means which may result in a lack of clari...

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