Results 41 to 50 of about 278,137 (249)

Fully turbulent discrete adjoint solver for non-ideal compressible flow applications

Journal of the Global Power and Propulsion Society, 2017
Non-Ideal Compressible Fluid-Dynamics (NICFD) has recently been established as a sector of fluid mechanics dealing with the flows of dense vapors, supercritical fluids, and two-phase fluids, whose properties significantly depart from those of the ideal ...
Salvatore Vitale, Tim A. Albring, Matteo Pini, Nicolas R. Gauger, Piero Colonna   +4 more
doaj   +1 more source

Inverse‐Designed on‐Chip Terahertz Three‐Channel Mode and Wavelength Division Demultiplexer

Advanced Photonics Research, EarlyView.
An ultracompact terahertz demultiplexer is developed using a hybrid inverse design that combines genetic algorithms with topology optimization. The device enables simultaneous mode‐ and wavelength‐division multiplexing within a footprint smaller than two wavelengths.
Faqian Chong, Yulun Wu, Bingtao Gao, Shilong Li, Hongsheng Chen, Song Han   +5 more
wiley   +1 more source

Neural Fields for Highly Accelerated 2D Cine Phase Contrast MRI

Advanced Science, EarlyView.
ABSTRACT 2D cine phase contrast (CPC) MRI provides quantitative information on blood velocity and flow within the human vasculature. However, data acquisition is time‐consuming, motivating the reconstruction of the velocity field from undersampled measurements to reduce scan times. In this work, neural fields are proposed as a continuous spatiotemporal
Pablo Arratia, Martin J. Graves, Mary McLean, Carolin Pirkl, Carola‐Bibiane Schönlieb, Timo Schirmer, Florian Wiesinger, Matthias J. Ehrhardt   +7 more
wiley   +1 more source

Interpretability and Representability of Commutative Algebra, Algebraic Topology, and Topological Spectral Theory for Real‐World Data

Advanced Intelligent Discovery, EarlyView.
This article investigates how persistent homology, persistent Laplacians, and persistent commutative algebra reveal complementary geometric, topological, and algebraic invariants or signatures of real‐world data. By analyzing shapes, synthetic complexes, fullerenes, and biomolecules, the article shows how these mathematical frameworks enhance ...
Yiming Ren, Guo‐Wei Wei
wiley   +1 more source

The Optimization of a Volute Downstream of a Vaned Radial Compressor

International Journal of Turbomachinery, Propulsion and Power
Volutes downstream of radial compressor impellers and their respective diffusors have proven to be useful flow geometries, as they collect and deflect the swirling mass flow efficiently and feature a compact shape.
Nicolas Lachenmaier, Friedrich Fröhlig, Tobias Männle   +2 more
doaj   +1 more source

Médecine coloniale et santé autochtone au Saguenay et sur la Côte-Nord : de la vaccination à l’Hôpital indien de Pointe-Bleue, 1854-1894

Revue d'Études Autochtones, 2022
Au milieu du xixe siècle, l’ouverture du Saguenay et de la Côte-Nord à la colonisation entraîne une dégradation de la santé autochtone. Devant les ravages engendrés par prolifération des épidémies, le département des Affaires indiennes est appelé à ...
Mathieu Arsenault
doaj   +1 more source

Self-adjoint symmetry operators connected with the magnetic Heisenberg ring

, 2009
We consider symmetry operators a from the group ring C[S_N] which act on the Hilbert space H of the 1D spin-1/2 Heisenberg magnetic ring with N sites. We investigate such symmetry operators a which are self-adjoint (in a sence defined in the paper) and ...
Bernd Fiedler, Boerner H, Boerner H, Clausen M, Fiedler B, Fiedler B, Fiedler B, Fiedler B, Fiedler B, Fiedler B, Fulling S A, Gordon D J, Jakubczyk D, Jakubczyk P, Jakubczyk P, Karbach M, Karbach M, Kerber A, Weyl H, Weyl H   +19 more
core   +1 more source

Topology Optimization for a Rigid‐Compliant Hybrid Constant Force Gripper

Advanced Intelligent Systems, EarlyView.
Constant‐force grippers deliver near‐constant output without sensors, cutting cost and complexity. This study proposes a topology‐optimization framework jointly designing rigid links and material distribution, modeled via link‐state and element‐density variables with constant force as the objective.
Shuhao Xia, Puchen Zhu, Wenkai Lai, Qiye Zhou, Yilun Tong, Xin Ma   +5 more
wiley   +1 more source

The non-self-adjointness of the radial momentum operator in n dimensions

, 2002
The non self-adjointness of the radial momentum operator has been noted before by several authors, but the various proofs are incorrect. We give a rigorous proof that the $n$-dimensional radial momentum operator is not self- adjoint and has no self ...
Albeverio S, Blank J, Cohen-Tannoudji C, Dirac P A M, Essén H, Gil Paz, Levin O, Liboff R L, Messiah A, Paz G, Reed M, Twamley J   +11 more
core   +2 more sources

Performance improvement of discrete‐time linear‐quadratic regulators applied to uncertain linear systems using the Tikhonov regularization method

Asian Journal of Control, EarlyView.
Abstract The linear‐quadratic regulator (LQR) problem of optimal control of an uncertain discrete‐time linear system (DTLS) is revisited in this paper from the perspective of Tikhonov regularization. We show that an optimally chosen regularization parameter reduces, compared to the classical LQR, the values of a scalar error function, as well as the ...
Fernando Pazos, Amit Bhaya
wiley   +1 more source