Results 111 to 120 of about 120,275 (213)

The Harmonic Pitching NACA 0018 Airfoil in Low Reynolds Number Flow

open access: yesEnergies
This study investigates the aerodynamic performance of a symmetric NACA 0018 airfoil under harmonic pitching motions at low Reynolds numbers, a regime characterized by the presence of laminar separation bubbles and their impact on aerodynamic forces. The
Jan Michna   +2 more
doaj   +1 more source

Hierarchical location method for harmonic sources in low-observability power distribution systems

open access: yes电力工程技术
To address the issue of harmonic source localization in low-observability power distribution systems, a hierarchical localization method based on physical network structure information is proposed.
Jianghui LI   +4 more
doaj   +1 more source

Loudness matching of complex tones simulating sounds from electric trucks

open access: yesActa Acustica
With electric powertrains quickly advancing in the heavy vehicle sector, there is an increasing interest in the industry to find a general practice for evaluating tonal sounds. The challenge to set requirements is complex.
Nyman Birgitta Elise, Nykänen Arne
doaj   +1 more source

Ultra high energy gamma ray point sources and cosmic ray anisotropy [PDF]

open access: yes, 1994
The experimental set-up at the Baksan Air Shower Array, used to detect air showers above ~0.2xl0(^14)eV, is described. An estimation of the angular resolution using the cosmic ray shadow of the Sun and the Moon gives a value of ~2.5˚ which is consistent ...
Graham, Lilian Joan, Graham, L.J
core  

Harmonic Current Suppression of Dual Three-Phase Permanent Magnet Synchronous Motor with Improved Proportional-Integral Resonant Controller

open access: yesEnergies
The impedance of the harmonic plane in a dual three-phase permanent magnet synchronous motor (DTP-PMSM) is very low, meaning that even small harmonic voltages can induce significant harmonic currents, particularly at the fifth and seventh harmonic ...
Lei Chen   +4 more
doaj   +1 more source

On the p-adic valuation of harmonic numbers

open access: yesJournal of Number Theory, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources

On the number of nodal domains of spherical harmonics

open access: yesTopology, 1996
It is well known that the \(n\)-th eigenfunction to one-dimensional Sturm-Liouville eigenvalue problems has exactly \(n - 1\) nodes, i.e. non-degenerate zeros. For higher dimensions, it is much more complicated to obtain general statements on the zeros of eigenfunctions.
openaire   +5 more sources

Central L-values of elliptic curves, Tunnell's Theorem, and locally harmonic Maass forms [PDF]

open access: yes, 2018
In this talk, we will discuss a way to study the vanishing of central L-values of elliptic curves via locally harmonic Maass forms. In particular, we will discuss some combinatorial applications, such as an alternative formula for Tunnell's resolution of
Kane, BR
core  

A polynomial identity and some of its new consequences [PDF]

open access: yesElectronic Journal of Mathematics
Michel Bataille, Robert Frontczak
doaj   +1 more source

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