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An error analysis technique based on Hill's equations for GPS and accelerometric measurements performed on board a low orbiting satellite
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Least squares, Galerkin and BVPs applied to the determination of global gravity field models
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The boundary value problem approach to the data reduction for a spaceborne gradiometer mission
No full textThe observation equation of spirit leveling in Molodensky's context
No full textSpirit leveling and surface gravity observations can be expressed as orthometric height
differences plus corrections which require the knowledge of the Earth crust density. For
leveling increments we can write observation equations in a linearized form, according
to the standard Molodensky approach, i.e., intrinsic geodesy, depending on normal height
differences plus a correction term. This term is a function of the gravity anomaly at the
surface level, thus not requiring any assumption on the crust density, and of the curvature of
the normal field force lines, which can not be neglected for leveling profiles directed along
meridians. The present work shows how to derive these observation equations. An example
is presented to verify the effectiveness of the new approach
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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