Results 51 to 60 of about 635,631 (297)

The CMS tracker operation and performance at the Magnet Test and Cosmic Challenge [PDF]

open access: yes, 2008
During summer 2006 a fraction of the CMS silicon strip tracker was operated in a comprehensive slice test called the Magnet Test and Cosmic Challenge (MTCC).
Broccolo, B.   +999 more
core   +1 more source

Hardware Design and Star Selection Algorithm for Arcsecond Pico Star Tracker [PDF]

open access: yes, 2020
The star tracker estimates pointing knowledge of a satellite in arcsecond accuracy in three axes without apriori knowledge. But star trackers are larger in size, heavier, power hungry and expensive for nanosatellite missions.
Muruganandan VA
core   +1 more source

From mice to humans—divergent strategies for intestinal homeostasis and regeneration

open access: yesFEBS Letters, EarlyView.
Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa   +2 more
wiley   +1 more source

Fast and robust star detection algorithm based on the dyadic wavelet transform

open access: yesIET Image Processing, 2023
Star detection is an important part of the spacecraft attitude determination performed by star trackers. The current advanced star detection algorithms can effectively extract star points in complex backgrounds.
Zhanglei Chen   +3 more
doaj   +1 more source

Design and analysis strategies for robust microbiome ageing research

open access: yesFEBS Letters, EarlyView.
The gut microbiome changes with age and associates with age‐related morbidity and mortality, establishing it as a potential biomarker and intervention target for ageing. Realising this potential requires methodological rigour, yet distinguishing biological signals from methodological artefacts remains challenging across cohorts. This review provides an
Mark Olenik   +5 more
wiley   +1 more source

MODELING AND SIMULATION OF HIGH RESOLUTION OPTICAL REMOTE SENSING SATELLITE GEOMETRIC CHAIN [PDF]

open access: yesThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2018
The high resolution satellite with the longer focal length and the larger aperture has been widely used in georeferencing of the observed scene in recent years.
Z. Xia, S. Cheng, Q. Huang, G. Tian
doaj   +1 more source

Online calibration for star trackers [PDF]

open access: yes, 2021
Star trackers are perhaps the most accurate means of measuring a spacecraft's orientation in space and are becoming a popular sensing instrument for attitude determination systems amongst conventional larger satellites as well as micro satellites. In order to produce and maintain high fidelity measurements, the systematic effects of lens distortion and
openaire   +1 more source

ATM star tracker vehicle structure occultation study [PDF]

open access: yes, 1969
Apollo Telescope Mount star tracker vehicle structure occultation ...
Lee, C. E.
core  

Star Position Estimation Improvements for Accurate Star Tracker Attitude Estimation [PDF]

open access: yes, 2015
This paper presents several methods to improve the estimation of the star positions in a star tracker, using a Kalman Filter. The accuracy with which the star positions can be estimated greatly influences the accuracy of the star tracker attitude ...
Delabie, Tjorven, Tjorven Delabie
core   +1 more source

Reconstructing enzyme evolution by protein engineering

open access: yesFEBS Letters, EarlyView.
Natural enzyme evolution can be retraced by protein engineering methods such as directed evolution, rational design, and ancestral sequence reconstruction. These approaches reveal how enzymes emerged from ligand‐binding scaffolds, developed varying substrate preferences, formed oligomeric complexes, adapted to environmental changes, and evolved novel ...
Lukas Drexler   +2 more
wiley   +1 more source

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