Results 71 to 80 of about 99,959 (290)

Real-Time Orbit Determination of Korean Navigation Satellite System based on Multi-GNSS Precise Point Positioning [PDF]

E3S Web of Conferences, 2019
This study proposes real-time orbit/clock determination of Korean Navigation Satellite System (KNSS), which employs the kinematic precise point positioning (PPP) solutions of multiple Global Navigation Satellite System (multi-GNSS) to compensate for ...
Kim Gimin, Oh Hyungjik, Park Chandeok, Seo Seungmo   +3 more
doaj   +1 more source

Sgr A* ``Visual Binaries'': A Direct Measurement of the Galactocentric Distance [PDF]

, 1998
We present a new geometrical method for measuring the distance to the Galactic center (R_0) by solving for the Keplerian orbit of individual stars bound to the black hole associated with the Sgr A* from radial velocity and proper motion measurements.
Andrew Gould, Eckart A., Feast M., Genzel R., Samir Salim   +4 more
core   +4 more sources

Organizing the interface—Plasma membrane architecture and receptor dynamics in virus‐cell interactions

FEBS Letters, EarlyView.
Plasma membranes contain dynamic nanoscale domains that organize lipids and receptors. Because viruses operate at similar scales, this architecture shapes early infection steps, including attachment, receptor engagement, and entry. Using influenza A virus and HIV‐1 as examples, we highlight how receptor nanoclusters, multivalent glycan interactions ...
Jan Schlegel, Christian Sieben
wiley   +1 more source

High-precision GPS orbit determination by integrating the measurements from regional ground stations and LEO onboard receivers

Satellite Navigation
High-precision Global Navigation Satellite System (GNSS) orbit and clock products are crucial for precise applications. An evenly distributed global network enables continuous tracking for GNSS satellites, while a regional network may result in tracking ...
Kai Li, Chengpan Tang, Shanshi Zhou, Xiaogong Hu, Xuhua Zhou   +4 more
doaj   +1 more source

The spectroscopic orbit of Capella revisited

, 2011
Context. Capella is among the few binary stars with two evolved giant components. The hotter component is a chromospherically active star within the Hertzsprung gap, while the cooler star is possibly helium-core burning. Aims.
Barlow, Böhm-Vitense, Danby, Gray, Griffin, Hummel, K. G. Strassmeier, Katsova, Lindegren, M. Weber, Pickles, Scarfe, Strassmeier, Strassmeier, Strassmeier, Strassmeier, Struve, Torres, Weber   +18 more
core   +1 more source

AAA+ protein unfoldases—the Moirai of the proteome

FEBS Letters, EarlyView.
AAA+ unfoldases are essential molecular motors that power protein degradation and disaggregation. This review integrates recent cryo‐electron microscopy (cryo‐EM) structures and single‐molecule biophysical data to reconcile competing models of substrate translocation.
Stavros Azinas, Marta Carroni
wiley   +1 more source

Summary of Lunar Constellation Navigation and Orbit Determination Technology

Aerospace
The Moon is the closest celestial body to the Earth. Its rich unique resources are an important supplement to the Earth’s resources and have a profound impact on the sustainable development of human society.
Xiao Zhang, Zhaowei Sun, Xiao Chen, Linxin Pan, Yubin Zhong   +4 more
doaj   +1 more source

Discovery of Par 1802 as a Low-Mass, Pre-Main-Sequence Eclipsing Binary in the Orion Star-Forming Region

, 2008
We report the discovery of a pre-main-sequence, low-mass, double-lined, spectroscopic, eclipsing binary in the Orion star-forming region. We present our observations including radial velocities derived from optical high-resolution spectroscopy, and ...
D'Antona F., K. G. Stassun, Latham D. W., P. A. Cargile, Parenago P. P., R. D. Mathieu   +5 more
core   +1 more source

pH‐mediated activation of the lysosomal arginine sensor SLC38A9

FEBS Letters, EarlyView.
Cells monitor nutrient levels via the lysosomal transporter SLC38A9 to activate the mechanistic target of rapamycin complex 1 (mTORC1). This study reveals that SLC38A9 function is regulated by pH. We identified histidine 544 as a critical pH sensor that undergoes conformational changes to control amino acid efflux from lysosomes; therefore, it ...
Xuelang Mu, Ampon Sae Her, Tamir Gonen
wiley   +1 more source

A demonstration of high precision GPS orbit determination for geodetic applications [PDF]

High precision orbit determination of Global Positioning System (GPS) satellites is a key requirement for GPS-based precise geodetic measurements and precise low-earth orbiter tracking, currently under study at JPL.
Border, J. S., Lichten, S. M.
core   +1 more source