Results 81 to 90 of about 14,321 (300)

Hidden Markov graphical models with state‐dependent generalized hyperbolic distributions

Canadian Journal of Statistics, EarlyView.
Abstract In this article, we develop a novel hidden Markov graphical model to investigate time‐varying interconnectedness between different financial markets. To identify conditional correlation structures under varying market conditions and accommodate shape features embedded in financial time series, we rely upon the generalized hyperbolic family of ...
Beatrice Foroni, Luca Merlo, Lea Petrella   +2 more
wiley   +1 more source

Use of Logistic Regression for Forecasting Short-Term Volcanic Activity

Algorithms, 2012
An algorithm that forecasts volcanic activity using an event tree decision making framework and logistic regression has been developed, characterized, and validated.
Mark T. Woods, William N. Junek, Linwood W. Jones   +2 more
doaj   +1 more source

Quantitatively Mapping Discolored Seawater around Submarine Volcanoes Using Satellite GCOM-C SGLI Data: A Case Study of the Krakatau Eruption in Indonesia in December 2018

GeoHazards, 2023
The final goal of this paper is to contribute to the difficult task of understanding and forecasting submarine volcanic eruption activity by proposing a method to quantify discolored water.
Yuji Sakuno, Sakito Hirao, Naokazu Taniguchi   +2 more
doaj   +1 more source

Charge State Influence on Stability and Isomerism in Dehydrogenated PAHs: Insights from Anthracene, Acridine, and Phenazine

ChemPhysChem, Volume 26, Issue 6, March 15, 2025.
The ionization of anthracene, acridine, and phenazine has been explored, along with the removal of one and two hydrogen atoms, to provide valuable information for astrochemists and to understand the behavior of the resulting structures and their electronic reorganization. Abstract In this study, we systematically explored the stability and isomerism of
Khaldia Zghida, Farouk Hamza Reguig, Manuel Alcamí, Al Mokhtar Lamsabhi   +3 more
wiley   +1 more source

From rest to eruption: How we should anticipate volcanic eruptions

npj Natural Hazards
Volcanic eruptions are typically preceded by unrest, marked by increased seismicity, ground deformation, and gas emissions. Unrest can last from decades to minutes.
J. Martí
doaj   +1 more source

Experimental Constraints on Forecasting the Location of Volcanic Eruptions from Pre-eruptive Surface Deformation

Frontiers in Earth Science, 2018
Volcanic eruptions pose a threat to lives and property when volcano flanks and surroundings are densely populated. The local impact of an eruption depends firstly on its location, whether it occurs near a volcano summit, or down on the flanks.
Frank Guldstrand, Olivier Galland, Erwan Hallot, Steffi Burchardt, Steffi Burchardt   +4 more
doaj   +1 more source

Policy Entrepreneurs and the Design of Administrative Reform: A Conceptual Framework and the Israeli Case

European Policy Analysis, EarlyView.
ABSTRACT What is the role of policy entrepreneurs in promoting the design of public administrative reform? We present a conceptual framework for assessing the influence of policy entrepreneurs on public administrative reform. We start by proposing a typology of the various policy entrepreneurs active in the administrative reform arena.
Nissim Cohen
wiley   +1 more source

Prevalence of Seismic Rate Anomalies Preceding Volcanic Eruptions in Alaska

Frontiers in Earth Science, 2018
Seismic rate increases often precede eruptions at volcanoes worldwide. However, many eruptions occur without such precursors. Additionally, identifying seismic rate increases near volcanoes with high levels of background seismicity is non-trivial and ...
Jeremy D. Pesicek, John J. Wellik, Stephanie G. Prejean, Sarah E. Ogburn   +3 more
doaj   +1 more source

Climate Change Has Already Reshaped North American Forest Pest Dynamics: Insights From Multidecadal Process‐Based Modelling

Global Change Biology Communications, EarlyView.
Climate change has rapidly expanded and shifted suitable climate conditions for eight major forest pests across North America, especially toward northern and higher elevation areas. Host exposure and overlap among pests are increasing, raising ecological and economic risks, and signaling accelerating future impacts under continued warming.
Yan Boulanger, Chris J. K. MacQuarrie, Véronique Martel, Jacques Régnière, Rémi Saint‐Amant, Kishan Sambaraju   +5 more
wiley   +1 more source

Forecasting Eruptions at Steamboat Geyser: Time Scales, Differentiability, and Detectability of Seismic Precursors Through Data‐Driven Methods

Journal of Geophysical Research: Machine Learning and Computation
Geyser eruptions provide a test bed for using geophysical data to forecast eruptions and to understand heat and mass transport in hydrothermal systems.
Alberto Ardid, Anna Barth, David Dempsey, Michael Manga, Shane J. Cronin   +4 more
doaj   +1 more source