Article
Meteorology & Atmospheric Sciences
Yuan-Ming Cheng, Stefan Tulich, George N. Kiladis, Juliana Dias
Summary: Observational evidence is presented for two extratropical pathways to forcing tropical convective disturbances. The first pathway involves resonance between the tropics and extratropics, leading to the excitation of equatorial waves. The second pathway involves the intrusion of midlatitude systems into the tropics, directly forcing tropical convection. This study highlights the importance of extratropical forcing in tropical circulations and its potential for improving weather predictions beyond 2 weeks.
JOURNAL OF CLIMATE
(2022)
Article
Computer Science, Artificial Intelligence
Fernando Moreno-Pino, Pablo M. Olmos, Antonio Artes-Rodriguez
Summary: In this paper, a forecasting architecture that combines deep autoregressive models with a Spectral Attention (SA) module is proposed. The architecture improves forecasting accuracy and produces explainable results in time series forecasting.
PATTERN RECOGNITION
(2023)
Article
Meteorology & Atmospheric Sciences
Paul C. Loikith, Deepti Singh, Graham P. Taylor
Summary: This study assesses the projected changes in atmospheric ridges and associated temperature and precipitation anomalies in the Pacific-North American region for the end of the twenty-first century. The results show a decrease in ridge days in fall through spring and an increase in ridge days in summer. The study also reveals that future ridges will exhibit similar temperature and precipitation anomaly associations as in the historical climate period.
JOURNAL OF CLIMATE
(2022)
Article
Geochemistry & Geophysics
Masahiro Akiba, Makoto Taguchi, Tetsuya Fukuhara, Takeshi Imamura, Toru Kouyama, Takao M. Sato
Summary: The analysis of the brightness temperature distribution above Venus' cloud tops reveals limb darkening phenomenon, vertical distributions of atmospheric temperature and cloud particle optical thickness. Vertical amplitude distributions of diurnal and semidiurnal tides were found in different latitudinal zones, with phase shifting observed in the equatorial region. By comparing observed and simulated vertical phase structures, it was suggested that the tide wave structure seen in the equatorial cloud tops is a result of upward propagation of gravity waves generated by solar heating in the upper cloud layer.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Chemistry, Analytical
Marta Berardengo, Giovanni Battista Rossi, Francesco Crenna
Summary: This paper discusses the spectral estimation of sea wave elevation time series using ARMA models, and analyzes the impact of parameters in the ARMA reconstruction process. In addition to focusing on mono-modal sea states, examples related to bi-modal sea states are also discussed.
Article
Biodiversity Conservation
Peter A. Vesk, William K. Morris, Will C. Neal, Karel Mokany, Laura J. Pollock
Summary: The study examined the predictive capacity of trait-species distribution models by fitting models in a reference region and applying them to a larger set of target areas, finding median predictive performance and the impact of model reliability on predictions. Transfer testing identified trait-environment relationships that did not transfer, highlighting the potential usefulness of traits and transfer testing in predicting environmental responses.
Article
Computer Science, Information Systems
Hyeyoung Ko, Suyeon Lee, Yoonseo Park, Anna Choi
Summary: This paper reviews the research trends that connect advanced technical aspects of recommendation systems with their business applications. By analyzing a large number of articles, conference papers, and industry data, the study found a close relationship between the growth of recommendation system research and the business growth of applied service fields. This research provides a comprehensive summary and insights for researchers interested in recommendation systems.
Article
Engineering, Electrical & Electronic
Giampiero Lovat, Walter Fuscaldo, Massimo Moccia, Giuseppe Castaldi, Vincenzo Galdi, Paolo Burghignoli
Summary: A rigorous full-wave modal analysis method based on the method of moments in the spectral domain is proposed for line waveguides with arbitrary anisotropic surface impedances. An integral equation is formulated with an auxiliary current sheet and the impedance boundary condition is extended to the entire plane. The method is validated with numerical results and compared with analytical and commercial simulator results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Multidisciplinary
Manus Henry
Summary: The Prism module implements recursive, linear phase FIR filtering with fixed computational cost and minimal design cost. A chain of six Prisms can create a narrowband filter with any central frequency and bandwidth using simple design rules. This technique applied to spectral analysis of data provides accurate estimates of frequency and amplitude of spectral peaks, identifying and rejecting spectral leakage for low amplitude and/or adjacent peaks.
Article
Mathematics, Applied
Matthew J. Picklo, Jennifer K. Ryan
Summary: This article presents a method for achieving more accurate multidimensional multiresolution analysis using convolution kernel post-processors. The filtering-projection tool allows for data transition between different resolutions while reducing errors in the fine grid approximation.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2022)
Article
Astronomy & Astrophysics
Katerina Podolska, Petra Koucka Knizova, Jaroslav Chum, Michal Kozubek, Dalia Buresova
Summary: The study utilized conditional independence graphical models to analyze the relationship between time variations of foF2 and solar/geomagnetic activity, demonstrating the effectiveness of this method in multivariate statistical analysis and identifying the impact of time shifts on correlations.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Mathematics, Applied
Matthew J. Picklo, Jennifer K. Ryan
Summary: In this article, we introduce a procedure called line Smoothness-Increasing Accuracy-Conserving Multi-Resolution Analysis, which utilizes convolution kernel post-processors to obtain more accurate multidimensional multiresolution analysis by reducing errors. This procedure allows for data transition between different resolutions while simultaneously decreasing errors in fine grid approximation. It specifically defines detail multi-wavelet coefficients when translating coarse data onto finer meshes, which are usually not defined in such cases. We show how to evaluate the resulting convolutions analytically and express the filtered approximation in a new basis. This procedure can be applied to piecewise constant approximations to functions and provides error reduction. We demonstrate the effectiveness of this technique in two and three dimensions.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2022)
Article
Mathematics, Applied
Norbert Marwan, Tobias Braun
Summary: The identification of cycles in periodic signals is a common problem in time series analysis. We propose a novel method that provides a power spectral estimate for discrete data, which is effective at detecting periodic cycles even in the presence of noise and for short event series.
Article
Geochemistry & Geophysics
Ricardo Augusto Borsoi, Tales Imbiriba, Jose Carlos Moreira Bermudez, Cedric Richard
Summary: This study proposes a library augmentation strategy to improve the diversity of existing spectral libraries by utilizing deep generative models to learn the statistical distribution of endmembers, resulting in an enhanced quality of the spectral unmixing process.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2021)
Article
Physics, Multidisciplinary
Jose Maria Ezquiaga, Daniel E. Holz
Summary: This study explores the use of the mass spectrum of neutron stars and black holes in gravitational-wave compact binary sources as a cosmological probe. By utilizing the full mass distribution, precise constraints on cosmology and the evolution of the mass distribution can be obtained.
PHYSICAL REVIEW LETTERS
(2022)