Results 51 to 60 of about 3,692 (130)
Asia-Pacific Journal of Chemical Engineering, Volume 21, Issue 4, July/August 2026.ABSTRACT This article investigates the Soret–Dufour cross‐diffusion effects on radiation‐absorptive unsteady free‐convection of magnetized nanofluids ( TiO2–water and Cu–water) flow over a vertical moving permeable plate. The model integrates thermal source, chemical reactions, porous resistance, and thermal radiation. The water‐based nanofluids mixing
B. Prabhakar Reddy +2 more
wiley +1 more source
Metalens‐Enabled Double‐Helix Point Spread Function for Multifunctional Imaging
Advanced Physics Research, Volume 5, Issue 7, July 2026.A single metalens is employed to generate a double‐helix point spread function (DH‐PSF). At the design wavelength, the PSF rotation angle varies linearly with depth, while the lobe spacing follows an inverse dependence on axial position. At a fixed depth, the lobe spacing further exhibits a linear dependence on wavelength due to dispersion.
Xuanyu Wu +8 more
wiley +1 more source
Doppler stretch and delay Cramer-Rao lower bound for signal with large bandwidth
Известия высших учебных заведений России: Радиоэлектроника, 2016 In this paper Cramer-Rao lower bound of joint Doppler stretch and delay estimation for wideband signal is derived. We use wideband term to denote cases in which narrowband signal model is inappropriate.
I. V. Gogolev
doaj
Existence of unbiased estimators in discrete quantum systems
Physical Review ResearchThe Cramér-Rao bound serves as a crucial lower limit for the mean square error of an estimator in frequentist parameter estimation. Paradoxically, it requires highly accurate prior knowledge of the estimated parameter for constructing the optimal ...
Javier Navarro +2 more
doaj +1 more source
Blind System Identification Using Symbolic Dynamics
IEEE Access, 2018 In this paper, a chaos-based approach is proposed for system identification with binary random signal. A chaos-based approach is developed to model random binary sequence and is applied to blind system identification.
Sumona Mukhopadhyay, Henry Leung
doaj +1 more source
Modified Cramer-Rao lower bound for symbol width estimation from a phase-shift-keying signal
Tongxin xuebao, 2009 The modified Cramer-Rao lower bound（MCRB） on symbol width estimation of a phase-shift-keying signal was derived.When calculating the integration of the square of dirac delta function δ（t ）, Parseval’s theorem was used to transform the computation from ...
DENG Zhen-miao, LIU Yu
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Optimal sensing on an asymmetric exceptional surface
Physical Review ResearchWe study the connection between exceptional points (EPs) and optimal parameter estimation, in a simple system consisting of two counterpropagating traveling wave modes in a microring resonator.
Robert L. Cook +2 more
doaj +1 more source
Cooperative localization algorithm based on time-ofarrival in wireless senor network
Dianxin kexue, 2019 A novel cooperative location method based on time-of-arrival in wireless senor networks was proposed. Firstly, the optimization problem for the target location was established.
Qianqian LU +3 more
doaj +2 more sources
Fundamental Limits of Wireless Localization With LoRa Technology
IEEE AccessWireless localization is emerging as a critical service in Internet of Things (IoT) applications, with Long Range (LoRa) technology gaining considerable attention due to its cost-effectiveness and extended-range capabilities.
Amir Shehni +5 more
doaj +1 more source
PCRLB for batch discrete‐time estimation through state decoupling
Electronics LettersThis letter aims to obtain a closed‐form performance metric using the smoothing posterior Cramér–Rao lower bound (PCRLB) for a class of direct discrete‐time kinematic models.
Xiao‐Chuan Bao, Ji‐An Luo
doaj +1 more source