Results 61 to 70 of about 3,308 (181)
Multi‐LiDAR Observations of Coastal Atmospheric Duct Evolution in Hampton Roads
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 12, 28 June 2026.Abstract To better understand the influence of atmospheric ducts on radio frequency (RF) operations, continuous high‐resolution observations of temperature and water vapor are essential. Hampton University's (HU) 48‐inch Raman‐Mie LiDAR provides such measurements through rotational and vibrational Raman techniques, enabling detailed monitoring of ...
Jia Su +4 more
wiley +1 more source
Sparse orthogonal matrices and the Haar wavelet
Discrete Applied Mathematics, 2000 The authors discuss the sparsity of orthogonal matrices which have a column of nonzero entries. It is shown that the minimun number of nonzero entries in such a matrix of size \(m\times m\) is \[ (\lfloor m\rfloor +3)m-2^{\lfloor m\rfloor+1}. \] This is optimal, as the paper characterizes the matrices which achieve this number.
Gi-Sang Cheon, Bryan L. Shader
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FMDNet: Spatial‐frequency feature routing for low‐dose CT denoising
Journal of Applied Clinical Medical Physics, Volume 27, Issue 6, June 2026.Abstract Background Low‐dose computed tomography (LDCT) is widely used to reduce radiation exposure, but the reduced photon budget amplifies quantum noise and can introduce structured artifacts that obscure subtle boundaries and textures. Many deep learning denoisers process features in a single stream, which may encourage either over‐smoothing of weak
Yujie Yao +6 more
wiley +1 more source
Wavelets obtained by continuous deformations of the Haar wavelet
Revista Matemática Iberoamericana, 1996 One might obtain the impression, from the wavelet literature, that the class of orthogonal wavelets is divided into subclasses, like compactly supported ones on one side, band-limited ones on the other side. The main purpose of this work is to show that, in fact, the class of low-pass filters associated with "reasonable" (in the localization sense, not
Bonami, Aline +2 more
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A Scalable Perovskite Platform With Multi‐State Photoresponsivity for In‐Sensor Saliency Detection
Advanced Materials, Volume 38, Issue 32, 8 June 2026.A scalable in‐sensor computing platform (32 × 32 array) with ultra‐low variability is developed by incorporating ferroelectric copolymers into halide perovskite thin films. These devices achieve 1000 programmable photoresponsivity states and high thermal reliability.
Xuechao Xing +10 more
wiley +1 more source
Image Compression using Haar and Modified Haar Wavelet Transform
Tikrit Journal of Engineering Sciences, 2013 Efficient image compression approaches can provide the best solutions to the recent growth of the data intensive and multimedia based applications. As presented in many papers the Haar matrix–based methods and wavelet analysis can be used in various ...
Mohannad Abid Shehab Ahmed +2 more
doaj
Mixed Problem for Partial Differential Equation of Large Time Variable Order
Journal of Optimization, Differential Equations and Their ApplicationsAn algorithm for solving a class of linear variable order fractional partial differential equations (FPDEs) is presented in this paper. We utilized a combination of Caputo fractional derivatives with the Haar wavelet collocation method (HWCM) and Eiler ...
Yaroslav M. Drin +2 more
doaj +1 more source
Solution of wave-like equation based on Haar wavelet
Le Matematiche, 2012 Wavelet transform and wavelet analysis are powerful mathematical tools for many problems. Wavelet also can be applied in numerical analysis. In this paper, we apply Haar wavelet method to solve wave-like equation with initial and boundary conditions ...
Naresh Berwal +2 more
doaj
Estimation of Delay Time in Linear Dynamic Systems Using Wavelets [PDF]
المجلة العراقية للعلوم الاحصائيةThis research explores the use of wavelets in estimating delay time in stochastic linear dynamic systems, as delay time plays a crucial role in diagnosing the system by determining the time interval between inputs and outputs.
Reem Taha +2 more
doaj +1 more source
HAAR WAVELET ANALYSIS OF CLIMATIC TIME SERIES
International Journal of Wavelets, Multiresolution and Information Processing, 2014 In order to extract the intrinsic information of climatic time series from background red noise, in this paper, we will first give an analytic formula on the distribution of Haar wavelet power spectra of red noise in a rigorous statistical framework. After that, by comparing the difference of wavelet power spectra of real climatic time series and red ...
Zhang, Zhihua +2 more
openaire +2 more sources