Results 31 to 40 of about 5,988,878 (288)

Interactive Earth rotation parameters through the Web

, 2003
International audienceOn the WEB site of the Earth Orientation Center(http://hpiers.obspm.fr/eop-pc) we propose a panel of interactive toolsdevoted to the study of the Earth rotation : selection and plots of theEarth Orientation Parameters (EOP ...
Bizouard, Christian
core   +3 more sources

3-D Low Earth Orbit Vector Estimation of Faraday Rotation and Path Delay

IEEE Access, 2015
An electromagnetic wave propagating through the ionosphere is subject to path delay and the depolarizing effect of Faraday rotation, both of which are dependent on global position and geometry.
Nicholas P. Lawrence, Hedley J. Hansen, Derek Abbott   +2 more
doaj   +1 more source

Linear Parameter-Varying Integrated Control Law Design for a Hypersonic Vehicle

Shanghai Jiaotong Daxue xuebao, 2022
A linear parameter-varying (LPV) integrated control law is designed for a hypersonic vehicle to achieve trajectory control based on an altitude-horizontal trajectory control concept.
YANG Shu, QIAN Yunxiao, YANG Ting
doaj   +1 more source

A more advanced theoretical model of the sphere earth's EM in a foreign homogeneous EM field

Vojnotehnički Glasnik, 2023
Introduction/purpose: The paper describes a more advanced theoretical model of the Earth's EM field based on two-component hypotheses. A defined mathematical model that shows the rotation of the magnetically conducting sphere of Tthe magnetization M ...
Slobodan N. Bjelić, Nenad A. Marković
doaj   +1 more source

Study on systematic errors of BDS-3 broadcast ephemeris and their effects with Helmert transformation

Satellite Navigation, 2023
Previous studies have not evaluated the systematic errors implied in the third generation of BeiDou-3 Navigation Satellite System (BDS-3) broadcast ephemeris.
Min Li, Jiangnan Zhang, Guo Chen, Liang Chen, Qile Zhao   +4 more
doaj   +1 more source

Middle- and Long-Term UT1-UTC Prediction Based on Constrained Polynomial Curve Fitting, Weighted Least Squares and Autoregressive Combination Model

Remote Sensing, 2022
Universal time (UT1-UTC) is a key component of Earth orientation parameters (EOP), which is important for the study of monitoring the changes in the Earth’s rotation rate, climatic variation, and the characteristics of the Earth.
Yuguo Yang, Tianhe Xu, Zhangzhen Sun, Wenfeng Nie, Zhenlong Fang   +4 more
doaj   +1 more source

El Niño effects on earth rotation parameters from LAGEOS and LARES orbital analysis

, 2017
Earth rotation, besides external actions due to other bodies in the solar system, is influenced by internal mass redistributions, including its atmospheric and water envelope.
Alessandro Gabrielli, Magdalena Kuzmicz-Cieslak, Ignazio Ciufolini, Antonio Paolozzi, Erricos C. Pavlis, Claudio Paris, Giampiero Sindoni, Paolozzi A., Gabrielli A., Sindoni G., Kuzmicz-Cieslak M., Pavlis E. C., Ciufolini I., Paris C.   +13 more
core   +2 more sources

Structures of mycobacterial 3‐methylcrotonyl‐CoA carboxylase reveal carrier‐domain translocation between catalytic sites

FEBS Letters, EarlyView.
Mycobacterial 3‐methylcrotonyl‐CoA carboxylase uses a mobile biotin‐carrying domain to shuttle a carboxyl group between two catalytic sites, enabling carboxylation of 3‐methylcrotonyl‐CoA during leucine breakdown. Cryo‐electron microscopy captures the carrier at both sites and reveals an inward loop movement that may prevent futile rebinding to the ...
Ajit Yadav, Bogdan I. Florea, Sebastian Geibel   +2 more
wiley   +1 more source

IGS Combined and Contributed Earth Rotation Parameter Solutions [PDF]

International Astronomical Union Colloquium, 2000
AbstractSince January 1995 the International GPS Service (IGS) has been combining and analyzing daily polar motion (PM) series, produced and submitted by seven IGS analysis centers (ACs) for the IGS Final orbit/clock combinations. Since June 30, 1996 the IGS Earth Rotation Parameter (ERP) series that accompany the IGS combined orbits, also include ...
Jan Kouba, Gerhard Beutler, Markus Rothacher   +2 more
openaire   +1 more source

The Shewanella oneidensis Fic enzyme SoFic targets the switch‐I region of EF‐Tu for AMPylation

FEBS Letters, EarlyView.
Fic enzymes mediate diverse post‐translational modifications across all domains of life, including AMPylation. Prokaryotic EF‐Tu can be AMPylated and deAMPylated by the conserved Fic enzyme SoFic. Structural and biochemical approaches were used to characterize the effect of AMPylation on EF‐Tu, SoFic's enzymatic activities, and the enzyme‐target ...
Svenja Runge, Vivian Pogenberg, Alexander Baumgart, Bente Siebels, Hartmut Schlüter, Michael Hecht‐Bucher, Aymelt Itzen   +6 more
wiley   +1 more source