An efficient direct solver for a class of mixed finite element problems [PDF]
, 2001 In this paper we present an efficient, accurate and parallelizable direct method for the solution of the (indefinite) linear algebraic systems that arise in the solution of fourth-order partial differential equations (PDEs) using mixed finite element ...
Anderson +39 more
core +1 more source
Assessment of ZTD derived from ECMWF/NCEP data with GPS ZTD over China
GPS Solutions, 2011 The accuracy and feasibility of computing the zenith tropospheric delays (ZTDs) from data of the European Center for Medium-Range Weather Forecasts (ECMWF) and the United States National Centers for Environmental Prediction (NCEP) are studied. The ZTDs are calculated from ECMWF/NCEP pressure-level data by integration and from the surface data with the ...
Chen, Q. +5 more
openaire +4 more sources
Magnetic heating across the cosmological recombination era: Results from 3D MHD simulations [PDF]
, 2018 The origin of cosmic magnetic fields is an unsolved problem and magnetogenesis could have occurred in the early Universe. We study the evolution of such primordial magnetic fields across the cosmological recombination epoch via 3D magnetohydrodynamic ...
Banerjee, Robi +3 more
core +2 more sources
Tight estimates for convergence of some non-stationary consensus algorithms [PDF]
, 2007 The present paper is devoted to estimating the speed of convergence towards consensus for a general class of discrete-time multi-agent systems. In the systems considered here, both the topology of the interconnection graph and the weight of the arcs are ...
Angeli +19 more
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A global grid model for the estimation of zenith tropospheric delay considering the variations at different altitudes [PDF]
Geoscientific Model Development, 2023 The accuracy of tropospheric delay correction heavily depends on the quality of the tropospheric model, and the zenith tropospheric delay (ZTD) is an important factor affecting the tropospheric delay. Therefore, it is essential to establish a precise ZTD
L. Huang +10 more
doaj +1 more source
Schur-Weyl Duality for the Clifford Group with Applications: Property Testing, a Robust Hudson Theorem, and de Finetti Representations [PDF]
, 2019 Schur-Weyl duality is a ubiquitous tool in quantum information. At its heart is the statement that the space of operators that commute with the tensor powers of all unitaries is spanned by the permutations of the tensor factors. In this work, we describe
Gross, David +2 more
core +2 more sources
Atmosphere, 2022 Tropospheric delay is one of the key factors that may affect high-precision satellite navigation and positioning and water vapor retrieval performance.
Xin Wang +8 more
doaj +1 more source
Real-Time Water Vapor Maps from a GPS Surface Network: Construction, Validation, and Applications [PDF]
, 2009 In this paper the construction of real-time integrated water vapor (IWV) maps from a surface network of global positioning system (GPS) receivers is presented.
Haan, S., de +2 more
core +2 more sources
Modelling Systematic Residuals in Absolute ZTD Estimation from GPS [PDF]
2006 IEEE International Symposium on Geoscience and Remote Sensing, 2006 Abstract —Tropsheric delay is one of important error sources in GPS positioning and InSAR applications. Accurate measurements of ZTD (Zenith Tropospheric Delay) can be used for correcting the atmospheric delay on GPS and InSAR as well as atmospheric science research and applications (e.g. numeric weather prediction).
S. Jin +3 more
openaire +1 more source
Development and evaluation of the refined zenith tropospheric delay (ZTD) models [PDF]
Satellite Navigation, 2021 AbstractThe tropospheric delay is a significant error source in Global Navigation Satellite System (GNSS) positioning and navigation. It is usually projected into zenith direction by using a mapping function. It is particularly important to establish a model that can provide stable and accurate Zenith Tropospheric Delay (ZTD).
Fei Yang +4 more
openaire +2 more sources