2,457 research outputs found
Dynamically Triggered Changes of Plate Interface Coupling in Southern Cascadia
In subduction zones, frictional locking on the subduction interface produces year-by-year surface deformation that is measurable with GPS. During the interseismic period of the earthquake cycle, lasting hundreds of years between major earthquakes, these ground motions are usually constant with time because the locking on the plate interface is relatively unchanging. However, at the Mendocino Triple Junction in Northern California, we find evidence for slight changes in GPS interseismic motion within the last decade that challenge the assumption of constant interseismic deformation. Our results suggest changes in interseismic coupling on the southernmost Cascadia Subduction Zone. Interestingly, these coupling changes appear to be related to large offshore earthquakes and are perhaps triggered by the seismic shaking during those events. These results have important implications for our understanding of seismic hazard in subduction zones.National Science Foundation (NSF). Grant Number: EAR-1841371NSF Graduate Research Fellowship Program and NSF. Grant Number: OCE-1905098NSF Cooperative Agreement. Grant Number: EAR-073515
Evaluación y diseño estructural del pabellón C de la Institución Educativa Inmaculada Concepción, Tumbes – Tumbes - 2022
La presente investigación “Evaluación y Diseño Estructural del Pabellón C de la
Institución Educativa Inmaculada Concepción, Tumbes 2022” tiene como finalidad
determinar y establecer el estado en el cual se encuentra dicha edificación para
posteriormente elaborar un diseño estructural del pabellón evaluado.
Consiste en realizar la evaluación de la estructura por medio de una inspección
visual, así como también realizar ensayos y verificar el análisis sísmico, posterior a
ellos se obtendrán los parámetros para el nuevo diseño del pabellón en materia de
estudio como forma de solución a la problemática encontrada.
El estudio de suelos nos dio como resultado una capacidad portante de 1.07 kg/cm
2,
como resultado de esclerometría que se realizó a la estructura del pabellón en
estudio se obtuvo una compresión del concreto mayor a 210 kg/cm2 .
Se verificaron las fallas existentes en el pabellón C , las cuales fueron de afectación
estructural en columnas , vigas y muros , la mala conservación de materiales
producto de la presencia de sales en el suelo de la zona y negligencias en el
proceso constructivo , por ello se planteo un nuevo diseño para el pabellón C de la
Institución Educativa
An INTEGRAL/SPI view of reticulum II: Particle dark matter and primordial black holes limits in the MeV range
© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1093/mnras/stac008Reticulum II (Ret II) is a satellite galaxy of the Milky Way and presents a prime target to investigate the nature of dark matter (DM) because of its high mass-to-light ratio. We evaluate a dedicated INTEGRAL observation campaign data set to obtain -ray fluxes from Ret II and compare those with expectations from DM. Ret II is not detected in the -ray band 25--8000 keV, and we derive a flux limit of . The previously reported 511 keV line is not seen, and we find a flux limit of . We construct spectral models for primordial black hole (PBH) evaporation and annihilation/decay of particle DM, and subsequent annihilation of positrons produced in these processes. We exclude that the totality of DM in Ret II is made of a monochromatic distribution of PBHs of masses . Our limits on the velocity-averaged DM annihilation cross section into are . We conclude that analysing isolated targets in the MeV -ray band can set strong bounds on DM properties without multi-year data sets of the entire Milky Way, and encourage follow-up observations of Ret II and other dwarf galaxies.Peer reviewedFinal Accepted Versio
EmoNets: Multimodal deep learning approaches for emotion recognition in video
The task of the emotion recognition in the wild (EmotiW) Challenge is to
assign one of seven emotions to short video clips extracted from Hollywood
style movies. The videos depict acted-out emotions under realistic conditions
with a large degree of variation in attributes such as pose and illumination,
making it worthwhile to explore approaches which consider combinations of
features from multiple modalities for label assignment. In this paper we
present our approach to learning several specialist models using deep learning
techniques, each focusing on one modality. Among these are a convolutional
neural network, focusing on capturing visual information in detected faces, a
deep belief net focusing on the representation of the audio stream, a K-Means
based "bag-of-mouths" model, which extracts visual features around the mouth
region and a relational autoencoder, which addresses spatio-temporal aspects of
videos. We explore multiple methods for the combination of cues from these
modalities into one common classifier. This achieves a considerably greater
accuracy than predictions from our strongest single-modality classifier. Our
method was the winning submission in the 2013 EmotiW challenge and achieved a
test set accuracy of 47.67% on the 2014 dataset
The Hot QCD White Paper: Exploring the Phases of QCD at RHIC and the LHC
The past decade has seen huge advances in experimental measurements made in
heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) and more
recently at the Large Hadron Collider (LHC). These new data, in combination
with theoretical advances from calculations made in a variety of frameworks,
have led to a broad and deep knowledge of the properties of thermal QCD matter.
Increasingly quantitative descriptions of the quark-gluon plasma (QGP) created
in these collisions have established that the QGP is a strongly coupled liquid
with the lowest value of specific viscosity ever measured. However, much
remains to be learned about the precise nature of the initial state from which
this liquid forms, how its properties vary across its phase diagram and how, at
a microscopic level, the collective properties of this liquid emerge from the
interactions among the individual quarks and gluons that must be visible if the
liquid is probed with sufficiently high resolution. This white paper, prepared
by the Hot QCD Writing Group as part of the U.S. Long Range Plan for Nuclear
Physics, reviews the recent progress in the field of hot QCD and outlines the
scientific opportunities in the next decade for resolving the outstanding
issues in the field.Comment: 110 pages, 33 figures, 429 references. Prepared as part of the U.S.
Long-Range Plan for Nuclear Physic
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