Results 21 to 30 of about 6,641,291 (286)

An Adaptive Real-Time Detection Algorithm for Dim and Small Photoelectric GSO Debris

Sensors, 2019
Geosynchronous orbit (GSO) is the ideal orbit for communication, navigation, meteorology and other satellites, but the space of GSO is limited, and there are still a large number of space debris threatening the safety of spacecraft.
Quan Sun, Zhaodong Niu, Weihua Wang, Haijing Li, Lang Luo, Xiaotian Lin   +5 more
doaj   +1 more source

Detection of Floating Debris in the Lake Using Statistical Properties of Synthetic Aperture Radar Pulses [PDF]

Geo Data, 2023
This study developed the European Space Agency (ESA) Setinel-1 Ground Range Detected (GRD) time series analysis model for monitoring floating debris in lake areas through Google Earth Engine Application Programming Interface.
Donghyeon Yoon, Ha-eun Yu, Moung-Jin Lee
doaj   +1 more source

Characteristics of small-sized space debris objects detected at the Terskol observatory in 2016-2017

Open Astronomy, 2018
The study of near-Earth space includes the detection and investigation of an increasing number of space debris objects by ground-based optical telescopes. There is no natural cleansing of space in the geostationary region. The telescope Zeiss-2000 with a
Levkina Polina, Bakhtigaraev Nail, Martynyuk-Lototskyy Konstantin, Velichko Sergey, Sokolov Ilia, Bondar Arkadii, Khorunzhiy Pavel, Chazov Vadim   +7 more
doaj   +1 more source

Optical observations for energetic characterization of in-orbit explosion: the FREGAT-SB case [PDF]

, 2021
Over the past years, the constant increase of space debris and inactive satellites is the root cause of catastrophic events, such as collision between a debris and active satellites.
F. Curianò, F. Piergentili, F. Santoni, L. Cimino, S. Hadji Hossein, G. Zarcone, L. Mariani, M. Rossetti   +7 more
core  

The progress of laser ranging technology at Shanghai Astronomical Observatory

Geodesy and Geodynamics, 2019
As an important station of International Laser Ranging Service (ILRS), Shanghai Astronomical Observatory (SHAO) has upgraded Satellite Laser Ranging (SLR) system with high repetition rate and achieved some technological progress.
Zhibo Wu, Haifeng Zhang, Huarong Deng, Mingliang Long, Zhien Cheng, Zhongping Zhang, Wendong Meng   +6 more
doaj   +1 more source

SD-DETR: Space Debris Detection Transformer Based on Dynamic Convolutional Network and Cross-Scale Collaborative Attention

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
With the advancement of human exploration of near-Earth space, the number of space debris in Earth’s orbit has increased dramatically, posing serious threats to orbiting spacecraft.
Zhikang Zhang, Yang Zhang, Wei Liu, Chuankai Liu, Tingshan Liu   +4 more
doaj   +1 more source

Weak Spatial Target Extraction Based on Small-Field Optical System

Sensors, 2023
Compared to wide-field telescopes, small-field detection systems have higher spatial resolution, resulting in stronger detection capabilities and higher positioning accuracy.
Xuguang Zhang, Yunmeng Liu, Huixian Duan, E Zhang   +3 more
doaj   +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

Autonomy for Active Space Debris Removal: Research Issues and Approaches [PDF]

, 2013
Even though the infinite vastness of the universe is an accepted theory, apparently infinity ends when it comes to orbits surrounding the Earth. This was a hard lesson to learn when Iridium 33 and Cosmos 2251 collided in the low Earth orbit in February ...
Förstner, Roger, Peters, Susanne, Fiedler, Hauke   +2 more
core  

Structures of mycobacterial 3‐methylcrotonyl‐CoA carboxylase reveal carrier‐domain translocation between catalytic sites

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, Bogdan I. Florea, Sebastian Geibel   +2 more
wiley   +1 more source