Results 41 to 50 of about 1,981,461 (291)

Short-Range SAR Imaging From GHz to THz Waves

IEEE Journal of Microwaves, 2021
Synthetic aperture radar (SAR) is a well-known imaging technique and most commonly used up to the microwave frequency spectrum (below 30 GHz) which provides spatial resolution in the sub-m range.
Aman Batra, Jan Barowski, Dilyan Damyanov, Michael Wiemeler, Ilona Rolfes, Thorsten Schultze, Jan C. Balzer, Diana Gohringer, Thomas Kaiser   +8 more
doaj   +1 more source

Method and apparatus for frequency spectrum analysis [PDF]

, 1992
A method for frequency spectrum analysis of an unknown signal in real-time is discussed. The method is based upon integration of 1-bit samples of signal voltage amplitude corresponding to sine or cosine phases of a controlled center frequency clock which
Cole, Steven W.
core   +1 more source

Wavelet analysis of millisecond variability of Cygnus X-1 during its failed state transition

, 2005
Application of multi-resolution analysis adopting wavelets in order to investigate millisecond aperiodic X-ray variability of Cyg X-1 is presented. This relatively new approach in a time-series analysis allows us to study both the significance of any ...
Abramowicz, Angelini, Aschwanden, Balbus, Barreiro, Belloni, Bolton, Bowyer, Bożena Czerny, Bradt, Böttcher, Churazov, Cohen, Combes, Cui, Cui, Czerny, Daubechies, De Moortel, Di Salvo, Escalera, Farge, Feng, Flandrin, Freeman, Frick, Fritz, Frontera, Giannios, Gierlinski, Gierlinski, Gies, Gilfanov, Gleissner, Gray, Grossman, Herrero, Irastorza, King, Lehto, Liszka, Liszka, Lyubarskii, Maccarone, Menou, Meyer-Hofmeister, Mineshige, Miyamoto, Miyamoto, Montero, Narayan, Nowak, Nowak, Nowak, Paul, Paweł Lachowicz, Pottschmidt, Poutanen, Press, Psaltis, Reig, Revnivtsev, Revnivtsev, Rezzolla, Scargle, Scargle, Spruit, Steiman-Cameron, Stoeger, Sutherland, Szatmary, Terrell, Timmer, Torrence, Uttley, Van Der Klis, Vaughan, Vio, Walborn, Webster, Zdziarski, Zhang, Ziólkowski, Zycki, Zycki   +84 more
core   +2 more sources

Clinical Insights Into Hypercalcemia of Malignancy in Childhood

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Hypercalcemia of malignancy (HCM) is a rare but life‐threatening metabolic emergency in children that occurs in less than 1% of pediatric cancer cases, with a reported incidence ranging from 0.4% to 1.0% across different studies. While it is observed in 10%–20% of adult malignancies, pediatric HCM remains relatively uncommon.
Hüseyin Anıl Korkmaz
wiley   +1 more source

Comparative study of two typical one-third octave algorithms in substation noise analysis

Energy Reports, 2022
The one-third octave band (1/3-octave-band) is the most important output item in noise spectrum analysis, which can reflect the frequency characteristics of the noise.
Zhenghai Liao, Zheyuan Gan, Jingzhu Hu, Jun Zhao, Bing Zhou, Jiangong Zhang   +5 more
doaj   +1 more source

The properties of output frequencies of nonlinear volterra systems [PDF]

, 2008
Nonlinear systems usually have complicated output frequencies in the frequency domain. For the class of nonlinear Volterra systems, some interesting properties for system output frequencies are studied in this paper.
Billings, S.A., Jing, X.J., Lang, Z.Q.
core  

Personalized Selumetinib Dosing in Pediatric Neurofibromatosis Type 1: Insights From a Pilot Therapeutic Drug Monitoring Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Objective To evaluate selumetinib exposure using therapeutic drug monitoring (TDM) in pediatric patients with neurofibromatosis type 1 (NF1) and plexiform neurofibromas (PN), assess interpatient pharmacokinetic variability, and explore the relationship between drug exposure, clinical response, and adverse effects.
Janka Kovács, Zoltán Köllő, Balázs Gellért Karvaly, Mahmoud Obeidat, Rita Nagy, Péter Hegyi, Brigitta Teutsch, Eszter Tuboly, Miklós Garami   +8 more
wiley   +1 more source

INSTANTANEOUS FREQUENCY ESTIMATION USING A LEAST SQUARES TIME-FREQUENCY METHOD

Electrica, 2004
We present a method for estimating the instantaneous frequency of a signal. This method involves the calculation of a time-frequency energy density of the signal, then obtaining an instantaneous frequency estimation from this joint density.
Mahmut ÖZTÜRK, Aydın AKAN
doaj   +2 more sources

Chaos in large-amplitude pulsators: application to the beta Cep star HD180642

, 2013
The CoRoT observations of the beta Cephei star HD180642 uncover an unexpectedly rich frequency spectrum, in addition to several heat-driven modes. So far, two processes have been proposed to explain this behaviour: the presence of stochastic oscillations,
Degroote, Pieter
core   +1 more source

Spectrum of the Anomalous Microwave Emission in the North Celestial Pole with WMAP 7-Year data [PDF]

, 2012
We estimate the frequency spectrum of the diffuse anomalous microwave emission (AME) on the North Celestial Pole (NCP) region of the sky with the Correlated Component Analysis (CCA) component separation method applied to WMAP 7-yr data.
Bonaldi, Anna, Ricciardi, Sara
core   +3 more sources