Results 111 to 120 of about 5,818,450 (268)
Application of precise point positioning technology in airborne gravity measurement
Geodesy and Geodynamics, 2014 The precise point positioning (PPP) technology is applied to an airborne gravity survey. By analyzing the advantages and disadvantages of several velocity and acceleration measurement methods and in combination with an actual marine gravity survey, the ...
Yan Xincun +3 more
doaj +1 more source
Ambiguity Resolution with Precise Point Positioning
, 2014 Ambiguity resolution with PPP aims at effectively reducing the long convergence time. The research in this dissertation explores its potential for both dual-frequency signals and triple-frequency signals. One of the most popular PPP ambiguity resolution strategies with dual-frequency GNSS signals is to first fix the L1/L2 wide-lane ambiguities in the ...
openaire +2 more sources
Performance of Real-Time Precise Point Positioning
, 2013 The IGS Real-time Pilot Project (IGS-RTPP) provides real-time precise orbits and clocks, which support real-time positioning for single stations over large areas using the Precise Point Positioning (PPP) technique.
Hu, Congwei +5 more
core
Structural and biochemical analysis of a B12 superbinder
FEBS Letters, EarlyView.BtuG proteins are vitamin B12 scavengers in Bacteroides thetaiotaomicron, a dominant human gut bacterium. We present crystal structures of three BtuG homologs bound to cobalamin and its precursor cobinamide, revealing picomolar binding affinities, among the highest known for any natural protein.
Jose M. Martinez Felices +3 more
wiley +1 more source
A Novel Clock Parameterization and Its Implications for Precise Point Positioning and Ionosphere Estimation. [PDF]
Sensors (Basel), 2022 Keshin M +3 more
europepmc +1 more source
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 +2 more
wiley +1 more source
FEBS Letters, EarlyView.How do genomes gain new functional parts? In eukaryotes, which tend to evolve under weak selection, much of the genome is junk. Palazzo and Qiu borrow the logic of Markov chains to show how non‐functional DNA becomes functional through the appearance of intermediate states, which arise due to epistasis, buffering, and biochemical messiness, allowing ...
Alexander F. Palazzo, Yi Qiu
wiley +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 +6 more
wiley +1 more source
Performance Evaluation of Precise Point Positioning for BeiDou-3 B1c/B2a Signals in the Global Range. [PDF]
Sensors (Basel), 2021 Wang E +6 more
europepmc +1 more source
GPS precise point positioning for UAV photogrammetry [PDF]
The use of Global Positioning System (GPS) precise point positioning (PPP) ona fixed-wing unmanned aerial vehicle (UAV) is demonstrated for photogrammetricmapping at accuracies of centimetres in planimetry and about a decimetre in height,from flights of ...
Grant DS, Grayson B, Mills JP, Penna NT
core +2 more sources