Results 61 to 70 of about 583,316 (279)
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
Grayscale Iterative Star Spot Extraction Algorithm Based on Image Entropy
Applied SciencesStar trackers are susceptible to interference from stray light, such as sunlight, moonlight, and Earth atmosphere light, in the space environment, resulting in an overall improvement in the star image grayscale, poor background uniformity, low star ...
Qing Zhao +3 more
doaj +1 more source
High-Accuracy and Low-Cost Attitude Measurement Unit of the CubeSat
International Journal of Aerospace Engineering, 2020 This paper proposes high-accuracy and reliable attitude measurement methods exclusive for CubeSat with restrictions of low cost, limited space, and low power consumption.
Haining Ma +4 more
doaj +1 more source
Improved pointing information for SCIAMACHY from in-flight measurements of the viewing directions towards sun and moon [PDF]
Atmospheric Measurement Techniques, 2017 The SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) on Envisat (2002–2012) performed nadir, limb, solar/lunar occultation and various monitoring measurements.
K. Bramstedt +5 more
doaj +1 more source
, 2003 Talk from 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003. PSN THLT 004.
openaire +2 more sources
Focal Adjustment for Star Tracker
Defence Science Journal, 2010 Technique of measuring intensity distribution and size of spot image developed has been discussed, which is especially suitable for defocus adjustment in ground test of star tracker. A novel approach for choosing a proper defocusing position has been proposed based on collimator, Gaussian surface fitting method, and other ordinary instruments.
Liu Hai-bo +6 more
openaire +1 more source
FEBS Letters, EarlyView.Synechocystis strains deficient in succinate dehydrogenase (SDH) secrete more succinate than the WT under dark anaerobic conditions, supporting that SDH then primarily acts as SDH, not as a fumarate reductase. L‐aspartate oxidase (Laspo) from Synechocystis is functional under anaerobic conditions, reducing fumarate to succinate.
Kateryna Kukil +3 more
wiley +1 more source
Centroid determination hardware algorithm for star trackers [PDF]
The execution of centroid extraction algorithms using a microprocessor consumes considerable resources when compared to the other steps involved in star trackers.
100001782 +6 more
core +1 more source
SPACE DEBRIS, ANOTHER ENVIRONMENTAL ISSUE [PDF]
Challenges of the Knowledge Society, 2022 Space debris is defunct artificial objects in space which no longer serve a useful function (nonfunctional spacecraft and abandoned launch vehicle stages, mission-related debris, and particularly numerous in Earth orbit, fragmentation debris from the ...
Ioana PĂDURARIU
doaj
Assessment of geometric correction of remote sensing satellite images using RPC versus GCP [PDF]
Journal of Engineering Science and Military Technologies, 2018 Geometric distortions are common problems when dealing with remote sensing satellite images. Therefore, geometric correction is a necessary process for preparing remote sensing satellite images for many applications.
Mohamed Soliman +4 more
doaj +1 more source