Results 31 to 40 of about 2,135,515 (263)

Technology Demonstration of Space Situational Awareness (SSA) Mission on Stratospheric Balloon Platform

Remote Sensing
As the number of resident space objects (RSOs) orbiting Earth increases, the risk of collision increases, and mitigating this risk requires the detection, identification, characterization, and tracking of as many RSOs as possible in view at any given ...
Randa Qashoa, Vithurshan Suthakar, Gabriel Chianelli, Perushan Kunalakantha, Regina S. K. Lee   +4 more
doaj   +1 more source

(Technical Note) Design and Construction of Star Tracker Platform in Order to Satellite Attitude Determination Based on Star Tracking Algorithm [PDF]

فصلنامه علوم و فناوری فضایی, 2016
Attitude Determining is one of the major and critical satellites space missions. In this study, a new method to Attitude determination of satellites is presented. Such that, based on the proposed method search space will be more limited then accuracy and
Malihe Hashemi, Seyed Kamaleddin Mosavi Mashhadi, Seyed Majid Esmaeilzadeh, Mohammad Fiuzy   +3 more
doaj  

Peripheral lysosomes recruit PLEKHG3 to focal adhesions and restrain protrusion dynamics

FEBS Letters, EarlyView.
Proximity‐dependent labeling at the LAMTOR complex revealed the Rho GEF PLEKHG3 as a lysosome‐proximal protein directing the study toward the influence of lysosome positioning on actin dynamics and cell motility. We show that PLEKHG3 colocalizes with lysosomes at focal adhesion sites and observe that forced peripheral dispersion of lysosomes hinders ...
Rainer Ettelt, Ana‐Maria Sandru, Georg Vucak, Sebastian Didusch, Biljana Riemelmoser, Karin Ehrenreiter, Markus Hartl, Lukas A. Huber, Manuela Baccarini   +8 more
wiley   +1 more source

Satellite Star Tracker Breadboard with Space Debris Detection Capability for LEO [PDF]

, 2023
This paper evaluates the possibility of having a star tracker device running space debris algorithms. A simple star tracker breadboard was developed to evaluate the possibility of having a device running both stellar identification and space debris ...
Filho, Joel, Gafeira, R., Melício, Rui, Silva, A. R. R., Gordo, Paulo, Peixinho, Nuno   +5 more
core   +1 more source

Golgi enzymes are retrieved from the plasma membrane to the trans‐Golgi network

FEBS Letters, EarlyView.
Golgi enzymes are traditionally considered resident proteins retained within the Golgi apparatus. Here, we demonstrate that a subset transiently reaches the cell surface and is subsequently retrieved to the trans‐Golgi network via retrograde transport. Using a nanobody‐based toolkit, we uncover a dynamic trafficking cycle of several Golgi enzymes.
Dominik P. Buser, Tina Junne
wiley   +1 more source

Attitude-Correlated Frames Algorithms to Improve the Attitude Accuracy of the Star Tracker Under Highly Dynamic Conditions

, 2016
The attitude accuracy of a star tracker decreases rapidly when star images become motion-blurred under dynamic conditions. To improve the performance of the star tracker, the attitude-correlated frames (ACF) approach concentrating on the features of the ...
Shiqiao Qin, Ma, L., Wang, X., Liheng Ma, Franco Bernelli-Zazzera, Xingshu Wang, Qin, S., BERNELLI ZAZZERA, FRANCO   +7 more
core   +1 more source

Ligand‐dependent transcriptional heterogeneity in cell cycle gene expression delays G1/S entry

FEBS Letters, EarlyView.
EGF and HRG induce distinct G1/S progression programs in ErbB2‐amplified BT474 breast cancer cells. Despite activating the potent ErbB2–ErbB3 heterodimer, HRG does not accelerate cell‐cycle entry. Instead, EGF promotes earlier restriction‐point passage via ERK–FOS signaling, whereas HRG activates the AKT–MYC axis, driving transcriptional heterogeneity ...
Ririn Rahmala Febri, Ayaka Nagasato‐Ichikawa, Keita Iida, Shuhei Kimura, Akira Imamoto, Mariko Okada   +5 more
wiley   +1 more source

JUMPSAT: Qualifying three equipments in one Cubesat mission [PDF]

, 2013
We work on a student 3U Cubesat mission, called JUMPSAT, expected for 2017. This is a collaborative project involving both institutions (CNES, ONERA) and schools (ISAE, TELECOM Bretagne).
Grave, Julien, Lizy-Destrez, Stéphanie, Peille, Philippe, Lucas, William, Rouanne-Labe, Anne   +4 more
core  

Feasibility study of space-based debris detection using star tracker images

, 2022
LAUREA MAGISTRALEI detriti spaziali sono una minaccia per i veicoli spaziali in orbita attorno alla Terra a causa del rischio di una collsione che potrebbe danneggiare o distruggere un satellite attivo. Dato che i detriti più piccoli non sono catalogati
MASCETTI, STEFANO
core  

Star Identification Algorithm Based on Dynamic Distance Ratio Matching

Remote Sensing
A star tracker is a widely used celestial sensor in astronomical navigation systems, which calculates the spacecraft’s high-precision attitude by observing stars in space to obtain several star vectors.
Ya Dai, Chenguang Shi, Liyan Ben, Hua Zhu, Rui Zhang, Shufan Wu, Sixiang Shan, Yu Xu, Wang Zhou   +8 more
doaj   +1 more source