The new ESA satellite-only gravity field model via the direct approach

new semigroup compactifications via the enveloping semigroups of associated flows

this thesis deals with the construction of some function algebras whose corresponding semigroup compactification are universal with respect to some properies of their enveloping semigroups. the special properties are of beigan a left zero, a left simple, a group, an inflation of the right zero, and an inflation of the rectangular band.

the use of appropriate madm model for ranking the vendors of mci equipments using fuzzy approach

abstract nowadays, the science of decision making has been paid to more attention due to the complexity of the problems of suppliers selection. as known, one of the efficient tools in economic and human resources development is the extension of communication networks in developing countries. so, the proper selection of suppliers of tc equipments is of concern very much. in this study, a ...

Global gravity field recovery from satellite-to-satellite tracking data with the acceleration approach

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Validation Concepts for Gravity Field Models from New Satellite Missions

The new satellite missions CHAMP, GRACE and GOCE will provide significantly improved global gravity field information in terms of quality and spatial resolution. In order to quantify the quality of these gravity field models independently from the estimation procedure, new validation concepts are necessary using external information. Validation requires the processing of selected level 3 produc...

ESA. Satellite Trainer