Results 101 to 110 of about 1,248,900 (279)
Vision-Based CNN Prediction of Sunspot Numbers from SDO/HMI Images
The Open Journal of AstrophysicsSunspot numbers constitute the longest and most widely used record of solar activity, with direct implications for heliophysical research and space-weather applications.
Fabian C. Quintero-Pareja +3 more
doaj +1 more source
Computational Forecasting of Wavelet-converted Monthly Sunspot Numbers
Monthly average sunspot numbers follow irregular cycles with complex nonlinear dynamics. Statistical linear models constructed to forecast them are therefore inappropriate, while nonlinear models produce solutions sensitive to initial conditions.
Mak Kaboudan
core +1 more source
Explainable deep learning self‐supervised vision transformer for fundus‐based myopia classification
Acta Ophthalmologica, EarlyView.Abstract Purpose To develop and validate a self‐supervised vision transformer (ViT) for automated three‐class classification of Normal, High Myopia (HM), and Pathologic Myopia (PM) from colour fundus photographs, with anatomically faithful interpretability. Methods A DINOv2 self‐supervised ViT was fine‐tuned using a two‐stage transfer‐learning protocol
Eirini Maliagkani +6 more
wiley +1 more source
Stable sunspot equilibria in a cash-in-advance economy [PDF]
We analyze a monetary model with flexible labor supply, cash-inadvance constraints and seigniorage-financed government deficits. If the intertemporal elasticity of substitution of labor is greater than one, there are two steady states, one determinate ...
Ramon Marimon +2 more
core
Cosmic Rays and Sunspot Numbers [PDF]
In this activity students analyze and compare two or more graphs to determine if there is a correlation between sunspot number and the variation of cosmic ray flux. They discover that cosmic rays are very energetic particles, mostly protons and electrons,
Susan Higley
core +1 more source
Acta Ophthalmologica, EarlyView.Abstract Purpose To define interdevice differences in quantitative outer retinal biomarkers across three spectral‐domain (SD) optical coherence tomography (OCT) devices in geographic atrophy (GA). Methods Patients with GA prospectively underwent imaging using Spectralis (Heidelberg Engineering), Cirrus (Zeiss) and Maestro (Topcon) OCT devices ...
Klaudia Birner +10 more
wiley +1 more source
Some Experiments on the Prediction of Sunspot Numbers
Journal of the Royal Statistical Society Series B: Statistical Methodology, 1954 Summary Various methods of predicting annual sunspot numbers are considered. Linear and curvilinear regressions on previous values give very inaccurate predictions and semi-empirical methods appear better. The representation of the series as an autoregressive process is unsatisfactory.
openaire +2 more sources
An Alternative Approach to the Existence of Sunspot Equilibria [PDF]
This paper offers an alternative approach to the existence of sunspot equilibria. The economy has a single perishable good and fiat money within an overlapping generations framework with two possible extraneous events.
Haim Abraham
core
Updating of ADAPT predictions of sunspot activity [PDF]
, 1978 An eigenvector analysis procedure was used to analyze and develop algorithms for predicting sunspot numbers. The predictors in these algorithms consist of sunspot numbers from the preceding two solar cycles and magnetic index data from the preceding ...
Hunter, H. C.
core
Acta Ophthalmologica, EarlyView.Abstract Purpose This study investigated the self‐perceived competence, knowledge, confidence and attitudes of the UK optometric workforce with regard to nutritional advice for patients. Methods A validated questionnaire (NUTrition COMPetence) was used to survey the optometric workforce, which was adapted to UK optometric practice and nutritional ...
Duane Mellor +2 more
wiley +1 more source