Results 121 to 130 of about 6,360,569 (404)
Low Frequency Radio Observations of GRS1915+105 with GMRT [PDF]
arXiv, 2005 We present the first detailed low frequency radio measurements of the galactic microquasar GRS1915+105 with GMRT. Simultaneous observations were carried out at 610 and 244 MHz. Our data does not show any signature of spectral turn over even at low radio frequency of 244 MHz.
arxiv
LoTSS/HETDEX: Optical quasars I. Low-frequency radio properties of optically selected quasars [PDF]
, 2018 The radio-loud/radio-quiet (RL/RQ) dichotomy in quasars is still an open question. Although it is thought that accretion onto supermassive black holes in the centre the host galaxies of quasars is responsible for some radio continuum emission, there is still a debate as to whether star formation or active galactic nuclei (AGN) activity dominate the ...
arxiv +1 more source
Boundaries of photosynthesis: adaptations of carbon fixation in extreme environments
FEBS Open Bio, EarlyView.Photosynthesis faces challenges from environmental extremes of temperature, pH, and salinity, limiting gas diffusion, modifying membrane fluidity, and destabilizing photochemical and biochemical reactions. Photosynthetic organisms have evolved unique adaptations overcoming these stresses and maintaining their photosynthetic activity.
Pere Aguiló‐Nicolau +3 more
wiley +1 more source
Low-frequency radio navigation system [PDF]
, 1983 A method of continuous wave navigation using four transmitters operating at sufficiently low frequencies to assure essentially pure groundwave operation is described.
Wallis, D. E.
core +1 more source
, 2012 We theoretically investigate the momentum-resolved radio-frequency spectroscopy of a harmonically trapped atomic Fermi gas near a Feshbach resonance in the presence of equal Rashba and Dresselhaus spin-orbit coupling.
Hu, Hui +3 more
core +2 more sources
Quantum lock-in measurement of weak alternating signals
Quantum FrontiersThe detection of weak time-dependent alternating signals in a strongly noisy background is an important problem in physics and a critical task in metrology. Quantum lock-in amplifier can extract alternating signals within extreme noises by using suitable
Min Zhuang +3 more
doaj +1 more source
Radio Frequency Interference [PDF]
, 2017 A basic requirement of radio astronomy is access to a spectrum in which observations can be made without detrimental interference from transmissions by other services. In the early years of radio astronomy, when most of the radio astronomy bands below a few GHz were allocated, bandwidths of radio astronomy systems were generally no greater than a few ...
A. Richard Thompson +2 more
openaire +2 more sources
Understanding and Overcoming Immunotherapy Resistance in Skin Cancer: Mechanisms and Strategies
Aging and Cancer, EarlyView.This narrative review explores the mechanisms driving immunotherapy resistance in skin cancer, including tumor microenvironment factors, genetic mutations, and immune evasion strategies. It highlights potential strategies to overcome resistance, offering insights for improving therapeutic outcomes and guiding future research in personalized ...
Shreya Singh Beniwal +8 more
wiley +1 more source
, 2019 We present radio observations of a Type Ib supernova (SN) Master OT J120451.50+265946.6. Our low frequency Giant Metrewave Radio Telescope (GMRT) data taken when the SN was in the optically thick phase for observed frequencies reveal inhomogeneities in ...
Bjornsson, Claes-Ingvar +6 more
core +1 more source
YOLO Network-Based Extraction of Target Geometry From Time-Frequency Representation
IEEE AccessIn response to challenges in target geometric parameter extraction from radar echoes, an improved YOLOv8 neural network model is proposed in this paper to recognize target types and extract geometric parameters of targets from time-frequency ...
Jingyuan Han, Kunyi Guo, Xinqing Sheng
doaj +1 more source