Results 31 to 40 of about 34,662 (316)
International Journal of Satellite Communications and Networking, Volume 41, Issue 1, Page 82-97, January/February 2023., 2023 This paper analyzes which constellation characteristics provide the best global coverage at the lowest operational cost. Our analysis has found that geostationary and medium Earth orbit satellite constellations have the highest likelihood of profitability. LEO networks are more expensive, but if designed wisely, they can be competitive.
Inigo del Portillo +3 more
wiley +1 more source
Research on the safe separation corridor of the combined aircraft and its generation method
Xibei Gongye Daxue Xuebao, 2023 Aerial safety separation is an important indicator to evaluate the flight performance of medium and low speed combination aircraft. In this paper, the concept of impact box and safe separation corridor will be introduced for the air separation problem of
PAN Yihua +4 more
doaj +1 more source
Distributing Three-Dimensional Aerodynamic Load to Fem Nodes [PDF]
MATEC Web of Conferences, 2019 Aiming at the requirement of the load conversion in aeronautics and astronautics static strength analysis, a three-dimensional aerodynamic load equivalent distribution method based on least squares is proposed.
Weimin Sun
doaj +1 more source
Experimental and Numerical Investigations on the Ignition of RBCC Gas-Oxygen/Kerosene Rocket Ejector
International Journal of Aerospace Engineering, 2021 The rocket ejector refers to a core component of a rocket-based combined cycle (RBCC) engine. The ignition is of critical significance for rocket ejection. Reliable and stable ignition crucially determines the normal operation of the engine.
Bingyang Liu +5 more
doaj +1 more source
A Feature-Map-Based Method for Explaining the Performance Degradation of Ship Detection Networks
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023 The unknowability of the inner workings limits the magnitude of performance improvement of ship target detection networks in synthetic aperture radar (SAR) images under Gaussian noise.
Peng Jia +5 more
doaj +1 more source
Modeling the effectiveness of radiation shielding materials for astronaut protection on Mars [PDF]
, 2022 The surface of Mars is bombarded by energetic charged particles of solar and cosmic origin with little shielding compared to Earth. As space agencies are planning for crewed missions to the red planet, a major concern is the impact of ionizing radiation on astronaut health.
arxiv +1 more source
Enabling Astronaut Self-Scheduling using a Robust Advanced Modelling and Scheduling system: an assessment during a Mars analogue mission [PDF]
arXiv, 2023 Human long duration exploration missions (LDEMs) raise a number of technological challenges. This paper addresses the question of the crew autonomy: as the distances increase, the communication delays and constraints tend to prevent the astronauts from being monitored and supported by a real time ground control.
arxiv
Advanced Science, EarlyView.Graphene‐PEDOT:PSS fillers revolutionize soft electronics by transforming jelly‐like materials into skin‐like systems with self‐healing, heat‐responsiveness, and multiplex sensing capabilities. This novel material exhibits exceptional printability, flexibility, and adhesiveness, enabling seamless integration into bioelectronics and tissue‐cyborganic ...
Morteza Alehosseini +7 more
wiley +1 more source
Multiscale Fusion Network Based on Global Weighting for Hyperspectral Feature Selection
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023 Feature selection (FS) is an important way to achieve high-precision and efficient classification of hyperspectral remote sensing images. However, most existing FS methods use a fixed scale to extract features and the relationship between spatial and ...
Jinjin Wang +4 more
doaj +1 more source
Training Priors Predict Text-To-Image Model Performance [PDF]
arXiv, 2023 Text-to-image models can often generate some relations, i.e., "astronaut riding horse", but fail to generate other relations composed of the same basic parts, i.e., "horse riding astronaut". These failures are often taken as evidence that models rely on training priors rather than constructing novel images compositionally.
arxiv