Water Allocation During Drought in Arizona and Southern California: Legal and Institutional Responses

vi, 101 p. : maps ; 28 cmhttps://scholar.law.colorado.edu/books_reports_studies/1084/thumbnail.jp

Water Allocation During Drought in Arizona and Southern California: Legal and Institutional Responses

vi, 101 p. : maps ; 28 cmhttps://scholar.law.colorado.edu/books_reports_studies/1084/thumbnail.jp

Converted phase elastic migration velocity analysis

Multi-component elastic seismic data collected at large offsets have the potential to be used in seismic imaging and velocity analysis. In this study, we present an approach for convertedphase elastic-transmission migration velocity analysis with an application for VSP and micro-seismic studies. Our approach is based on the cross-correlation between converted-phase Pand S-waves propagated backward in time, and is formulated as an inverse problem with a differential semblance criterium objective function for the simultaneous update of both P- and S-wave velocity models. The merit of this approach is that it is fully data-driven and requires only one elastic backward propagation to form an image rather than the two (one forward and one backward) acoustic propagations needed for standard RTM. Moreover, as the method does not require forward propagation, it does not suffer from migration operator source aliasing when a small number of shots are used. We present a derivation of the method and test it with the synthetic Marmousi model. We also show the differences between the standard reflection offset domain common image gathers and the converted-phase image gathers that we use for model updates

Directorio de colecciones de germoplasma en América Latina y el Caribe: Primera Edición

La información contenida en el Directorio se mantiene en las bases de datos de la FAO y del IPGRI, que se actualizan continuament

The Law of the Colorado River: Coping with Severe Sustained Drought

p. 825-836 : map ; 28 cmhttps://scholar.law.colorado.edu/books_reports_studies/1053/thumbnail.jp

Age group, location or pedagogue: factors affecting parental choice of kindergartens in Hungary

Hungary has experienced significant political, economic, demographic and social changes since the end of Soviet domination in the 1990s. The gradual move towards liberal-democracy has been accompanied by growing emphasis on individualism, choice and diversity. Universal kindergarten provision for 5-6 year olds is a long established feature of the Hungarian education system, but little is known about parental choice (Török, 2004). A case study (Yin, 2004) of factors influencing parental choice and satisfaction was undertaken in one Hungarian town. This was based on a survey of 251 parents of children attending both mixed-age and same-age groups across 12 kindergartens. Parents suggested that the most important influences were geographical location and the individual pedagogue(s). Given that traditionally each pedagogue follows ‘their’ cohort from kindergarten entry to primary school, their influence appears heightened. Although generally satisfied with their chosen arrangement, parents from same-age groups expressed significantly more confidence and satisfaction, particularly in relation to cognitive development and preparation for school. Parents appear less convinced about the trend towards mixed-age groups and questions are raised about sufficiency of evidence of their benefits in a Hungarian context and the driving factors behind change

The Watershed Source Book: Watershed-Based Solutions to Natural Resource Problems

1 v. (various pagings) : maps (2 folded) ; 28 cmhttps://scholar.law.colorado.edu/books_reports_studies/1052/thumbnail.jp

The Watershed Source Book: Watershed-Based Solutions to Natural Resource Problems

1 v. (various pagings) : maps (2 folded) ; 28 cmhttps://scholar.law.colorado.edu/books_reports_studies/1052/thumbnail.jp