2,594 research outputs found
Crustal Structure Across the Northern Region of the Islas Marias Archipelago
The tectonic interaction between the Rivera and North American plates north
of the Bahia de Banderas is poorly understood. The nature of the crust and
where the subduction ends in the western part of the Islas Marias Archipelago
are still controversial. Based on new geophysical data provided by the TsuJal
project, we present the shallow and deep crustal structure of the Rivera North
American plate contact zone along two seismic transects, TS09b and RTSIM01b,
and the bathymetry obtained across the northern region of Maria Madre Island.
Detailed bathymetric analysis allowed mapping of a series of lineaments along
the study region, with two main preferred tendencies (020 050 and 290 320)
associated with the evolution of the Pacific-Rivera rise and the transform
faults of the Gulf of California, respectively. The shallow structure is
characterized by five sedimentary basins without deformation, whose horizons
are subparallel, suggesting that the sediment deposition occurred after the
extension process ended. The deep structure corresponds to a transition between
oceanic crust (Rivera Plate), with an average thickness of 10 km to the Islas
Marias Escarpment, and a thinned continental crust, whose thickness increases
toward the continent until it reaches 28 km, with a dip angle of 7 10. The
absence of an accretionary prism suggests that the subduction process of the
Rivera Plate beneath the North American Plate to the north of Islas Marias has
ceased. In this study, we determined that the morphological expression of the
northern limit of the Rivera Plate corresponds to the Islas Marias Escarpment.Comment: Frontiers in Earth Science, 202
On Not Taming the Wild Tongue: Challenges and Approaches to Institutional Translation in a University Serving a Historically Minoritized Population
A consequence of the development of modern states has been the concept of“minority” as used to refer to subsets of the population that are differentiated from that portion of the population which is seen as the “majority.” These minorities are at times distinguished from each other using terms such as national minorities and immigrant minorities. Some scholars have challenged the distinctions drawn by these constructs. An example of how such constructs are not always accurate can be found in Texas’ Rio Grande Valley, where ethnic and linguistic, immigrant and national, minority and majority are not always clear cut. “The Valley,” as the region is locally known, has a long history of the numerical majority being in a minoritized position. In this context, a local university administered a “speech test” to Mexican American studentswho enrolled between the 1950s and the 1970s. The purpose, according to Anzaldúa (1987), was to tame their “wild tongue.” This same university, now transformed, proposes to rehabilitate itself, as it becomes bilingual, bicultural,and biliterate. Accordingly, it now undertakes a systematic effort to bilingualize its operations, starting with the localization into Spanish of its website as conducted by the University of Texas Rio Grande Valley’s Translation and Interpreting Office. A number of terminological strategies and translation challenges stemming from the variegated lectal and diglossic landscapes of the region have arisen, which can be illuminated by the Post-Colonial paradigm found in Translation Studies
Spectral variability studies in Active Galactic Nuclei: Exploring continuum and emission line regions in the age of LSST and JWST
The investigation of emission line regions within active galaxies (AGNs) has
a rich and extensive history, now extending to the use of AGNs and quasars as
"standardizable" cosmological indicators, shedding light on the evolution of
our universe. As we enter the era of advanced observatories, such as the
successful launch of JWST and the forthcoming Vera C. Rubin Observatory's
Legacy Survey of Space and Time (LSST), the landscape of AGN exploration across
cosmic epochs is poised for exciting advancements. In this work, we delve into
recent developments in AGN variability research, anticipating the substantial
influx of data facilitated by LSST. The article highlights recent strides made
by the AGN Polish Consortium in their contributions to LSST. The piece
emphasizes the role of quasars in cosmology, dissecting the intricacies of
their calibration as standard candles. The primary focus centers on the
relationship between the broad-line region size and luminosity, showcasing
recent breakthroughs that enhance our comprehension of this correlation. These
breakthroughs encompass a range of perspectives, including spectroscopic
analyses, photoionization modeling, and collaborative investigations with other
cosmological tools. The study further touches on select studies, underlining
how the synergy of theoretical insights and advancements in observational
capabilities has yielded deeper insights into these captivating cosmic
entities.Comment: 34 pages, 5 figures, accepted for publication as a review in
MDPI/Univers
Evaluation of structural intervention in the Quartel das Esquadras, Almeida (Portugal)
The Quartel das Esquadras is an 18th century infantry barrack located within the limits of the bulwarked fortress of Almeida, in Portugal. An ongoing adaptive reuse project of the building aims to recover its full capacity and also its importance to the fortified village of Almeida, by implementing a variety of new uses. While adaptive reuse projects of historical buildings are a very recommendable solution for maintaining those constructions whose use has become obsolete, these projects demand careful study because they may introduce changes in the structural behaviour of the buildings to preserve.The architectural intervention results in the need of the structure to withstand new and diverse imposed loads, as well as inserting passages and communication systems to enable a proper contemporary use of the building, fulfilling architectural requirements and current building codes. As the current configuration of the structure will be altered, the main objective of this paper is to evaluate the suitability of some of the proposed structural interventions. Such evaluation requires a good understanding of the current state of the structure and the alterations proposed by the project. The current condition has been characterized following a multidisciplinary approach comprising historical research, visual inspection, non-destructive testing and structural analysis. The alterations proposed by the project have been described, identifying possible sources of major structural problems. A portion of the building particularly affected by the alterations has been selected to carry out structural analysis. A comparative safety assessment of the selected area in both current and altered condition has been done through finite element modelling and nonlinear static analysis, resulting in an identification of the weaker points against the new implemented loads and alterations. Finally, proposals for the implementation of the studied intervention, as well as recommendations for future research and analyses, have been given.- (undefined
Exploring heterogeneous scheduling for edge computing with CPU and FPGA MPSoCs
This paper presents a framework targeted to low-cost and low-power heterogeneous MultiProcessors that exploits FPGAs and multicore CPUs, with the overarching goal of providing developers with a productive programming model and runtime support to fully use all the processing resources available. FPGA productivity is achieved using a high-level programming model based on OpenCL, the standard for cross-platform parallel heterogeneous programming. In this work, we focus on the parallel for pattern, and as part of the runtime support for this pattern, we leverage a new scheduler that strives to maximize the number of iterations per joule by dynamically and adaptively partitioning the iteration space between the multicore and the accelerator when working simultaneously. A total of 7 benchmarks are ported and optimized for a low-cost DE1 board. The results show that the heterogeneous solution can improve performance up to 2.9x and increases energy efficiency up to 2.7x compared tothe traditional approach of keeping all the CPU cores idle while the accelerator computes the workload. Our results also demonstrate two interesting insights: First, an adaptive scheduler able to find at runtime the right chunk size for each type of application and device configuration is an essential component for these kinds of heterogeneous platforms, and second, device configurations that provide higher throughput do not always achieve better energy eciency when only the running power (excluding the idle power component) is considered
Membrane fractioning of pre-treated waste activated sludge for the recovery of valuable biocompounds
The Jalisco Seismic Accelerometric Telemetric Network (RESAJ)
The Jalisco region of western Mexico is the locus of interaction among the
North America, Cocos, and Rivera plates, giving rise to the Jalisco block. This
region is one of the most tectonically active in Mexico, and here took place
the largest instrumentally recorded earthquake in Mexico the twentieth century,
on 3 June 1932 (M 8.2), three important tsunamis in the last 100 yrs, and two
of the most active volcanoes in Mexico. Nevertheless, the first seismicity
studies here, undertaken with temporary networks, did not commence until 1994.
In 2008, the Government of Jalisco and the University of Guadalajara funded a
research project to install a seismic network in this region. The principal
objective was to study the seismic hazard in the region and characterize
seismic parameters in the different areas to design building codes. The Red
Sismica y Acelerometrica Telemetrica de Jalisco (RESAJ) project was thus
initiated in 2009. Its Central Lab is at Centro de Sismologia y Volcanologia de
Occidente (SisVOc), located at the Universidad de Guadalajara in Puerto
Vallarta. Currently, the RESAJ has 26 telemetered and 2 autonomous stations.
The RESAJ serves as the seismological lab for the postgraduate program at
SisVOc.Comment: Seismological Research Letters 201
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