Results 51 to 60 of about 17,988,623 (311)

Satellite Selection Strategy and Method for Signals of Opportunity Navigation and Positioning with LEO Communication Satellites

Sensors
Experts and scholars from various nations have proposed studying low Earth orbit (LEO) satellite signals as the space-based signals of opportunity (SOPs) for navigation and positioning.
Yanhua Tao, Yang Guo, Shaobo Wang, Chuanqiang Yu, Zimo Zhu   +4 more
doaj   +1 more source

Evaluation of Air Combat Control Ability Based on Eye Movement Indicators and Combination Weighting GRA-TOPSIS

Aerospace, 2023
At present, expert scoring is mainly used to evaluate the air combat control ability, which is not accurate enough to effectively achieve the desired effect.
Chenzhi Tian, Min Song, Jiwei Tian, Ruijun Xue   +3 more
doaj   +1 more source

Hybrid Position and Force Control Without Force Sensor

Journal of Robotics and Mechatronics, 1993
Generally, hybrid control is realized by sensor signal feedback of position and force. However, some robot manipulators do not have a force sensor due to the environment. Moreover, a precise force sensor is very expensive. In order to overcome these problems, we propose the estimation system of reaction force without using a force sensor.
Kiyoshi OHISHI, Masaru MIYAZAKI, Masahiro FUJITA   +2 more
openaire   +2 more sources

Mechanisms of parasite‐mediated disruption of brain vessels

FEBS Letters, EarlyView.
Parasites can affect the blood vessels of the brain, often causing serious neurological problems. This review explains how different parasites interact with and disrupt these vessels, what this means for brain health, and why these processes matter. Understanding these mechanisms may help us develop better ways to prevent or treat brain infections in ...
Leonor Loira, Sílvia Arroz‐Madeira, Cláudio A. Franco, Sara Silva Pereira   +3 more
wiley   +1 more source

Changes in physiological parameters and thermal comfort when wearing protective clothing in long-range aeromedical evacuation: a prospective, non-blinded, two-stage crossover self-controlled study

Journal of Physiological Anthropology
Background The thermos-physiological characteristics of medical personnel wearing protective clothing during prolonged activities under low oxygen pressure (LOP) and normal oxygen pressure (NOP) are crucial. Methods The average age of the 24 participants
Yadi Zhang, Fan Jiang, Zhenyao Song, Jintao Lian, Licun Han   +4 more
doaj   +1 more source

Research on UAV Conflict Detection and Resolution Based on Tensor Operation and Improved Differential Evolution Algorithm

Aerospace
With the widespread application of unmanned aerial vehicles (UAVs) in civilian and military fields, how to effectively detect and resolve conflicts of large-volume and high-density UAV flights in local airspace has become an important issue.
Zhichong Zhou, Guhao Zhao, Yiru Jiang, Yarong Wu, Jiale Yang, Lingzhong Meng   +5 more
doaj   +1 more source

Road Extraction by Using Atrous Spatial Pyramid Pooling Integrated Encoder-Decoder Network and Structural Similarity Loss

Remote Sensing, 2019
The technology used for road extraction from remote sensing images plays an important role in urban planning, traffic management, navigation, and other geographic applications.
Hao He, Dongfang Yang, Shicheng Wang, Shuyang Wang, Yongfei Li   +4 more
doaj   +1 more source

Research on Airspace Conflict Detection Method Based on Spherical Discrete Grid Representation

Applied Sciences, 2023
With the continuous development of general aviation, the contradiction between the air demand of general aviation low-altitude airspace and civil aviation routes is sharp.
Kai Qu, Guhao Zhao, Yarong Wu, Liang Tong   +3 more
doaj   +1 more source

Interfacial force sensor with force-feedback control [PDF]

International Technical Digest on Electron Devices, 2002
A novel interfacial force microscope capable of measuring the forces between two surfaces over the entire range of surface separations, up to contact, has been developed. The design is centered around a differential capacitance displacement sensor where the common capacitor plate is supported by torsion bars.
Joyce, S.A., Houston, J.E., Smith, B.K.
openaire   +1 more source

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source