Results 21 to 30 of about 500,559 (337)

Agglomeration decay in rural areas

open access: yesInsights into Regional Development, 2022
Spatial proximity to other economic activities – occasionally labeled as ‘market access’ and ‘economic density’ – is associated with good economic performance. How the impulses from economic activities diminish over space is known as ‘agglomeration decay’
Rasmus Bøgh Holmen
doaj   +1 more source

Exponential decay in the stark effect [PDF]

open access: yesCommunications in Mathematical Physics, 1980
LetH=−Δ+V+Fx1 withV(x1,x⊥) analytic in the first variable andV(x1+ia, x⊥) bounded and decreasing to zero asx → ∞ for eacha ∈ ℝ. Let ψ be an eigenvector of −Δ+V with negative eigenvalue. Among our results we show that forF≠0, (ψ,e−Hψ) decays exponentially at a rate governed by the positions of the resonances ofH.
openaire   +3 more sources

Bearing Fault Diagnosis Based on Natural Adaptive Moment Estimation Algorithm and Improved Octave Convolution

open access: yesIEEE Access, 2020
Fault diagnosis of rolling bearing has been the focus of research. Bearing signals are often accompanied by similar information, resulting in redundancy between data.
Mei Ying Qiao   +3 more
doaj   +1 more source

Analysis of Dynamic Characteristics of Tristable Exponential Section of Piezoelectric Energy Harvester

open access: yesEnergies, 2023
Variable-cross-section beams have better mass and strength distribution compared with constant cross-section beams, which can optimize the harvesting power of piezoelectric vibration energy harvesters, which are widely used in self-supplied and low-power
Zhaoxin Cai   +3 more
doaj   +1 more source

Is radioactive decay really exponential? [PDF]

open access: yesEPL (Europhysics Letters), 2012
Radioactive decay of an unstable isotope is widely believed to be exponential. This view is supported by experiments on rapidly decaying isotopes but is more difficult to verify for slowly decaying isotopes. The decay of 14C can be calibrated over a period of 12,550 years by comparing radiocarbon dates with dates obtained from dendrochronology.
openaire   +4 more sources

Classical picture of post-exponential decay [PDF]

open access: yes, 2010
Post-exponential decay of the probability density of a quantum particle leaving a trap can be reproduced accurately, except for interference oscillations at the transition to the post-exponential regime, by means of an ensemble of classical particles ...
Martorell, J.   +3 more
core   +2 more sources

Exponential Estimates and Stabilization of Discrete-Time Singular Time-Delay Systems Subject to Actuator Saturation

open access: yesDiscrete Dynamics in Nature and Society, 2012
This paper is concerned with exponential estimates and stabilization of a class of discrete-time singular systems with time-varying state delays and saturating actuators.
Jinxing Lin
doaj   +1 more source

Robust Bayesian Fluorescence Lifetime Estimation, Decay Model Selection and Instrument Response Determination for Low-Intensity FLIM Imaging.

open access: yesPLoS ONE, 2016
We present novel Bayesian methods for the analysis of exponential decay data that exploit the evidence carried by every detected decay event and enables robust extension to advanced processing.
Mark I Rowley   +3 more
doaj   +1 more source

The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimers

open access: yesAIP Advances, 2020
We experimentally investigated the practical electromagnetic effects in surface-enhanced Raman scattering (SERS), using the precisely fabricated array of gold nanosquare dimers. The array of gold nanosquare dimers was fabricated by electron-beam exposure
Satoshi Kaneko   +4 more
doaj   +1 more source

Energy Decay Estimates of a Timoshenko System with Two Nonlinear Variable Exponent Damping Terms

open access: yesMathematics, 2023
This paper is concerned with the asymptotic behavior of the solution of a Timoshenko system with two nonlinear variable exponent damping terms. We prove that the system is stable under some specific conditions on the variable exponent and the equal wave ...
Adel M. Al-Mahdi   +1 more
doaj   +1 more source

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