Search results for "wave"

A Methodological Approach to Determine Sound Response Modalities to Coastal Erosion Processes in Mediterranean Andalusia (Spain)

2020

Human occupation along coastal areas has been greatly increasing in recent decades and, in many places, human activities and infrastructures are threatened by erosion processes that can produce relevant economic and human losses. In order to reduce such impacts and design sound management strategies, which can range from the &ldquo

Preparation and characterisation of optical and optoelectronic devices based in two-dimensional semiconductors

2020

In the Materials Science field, two-dimensional materials have gained the scientific community attention in recent years. The change and the appearance of novel properties when their thickness is reduced to nanometric scale has special interest for its fundamental properties study for, from this base, the design and its implementation in devices. The wide variety of materials with the possibility of being exfoliated at the two-dimensional level opens the field to different applications, from optoelectronic devices, detection and sensing, energy storage, catalysis, medical applications and quantum information technologies, among others. This thesis gathers results in both directions: a funda…

Search for intermediate mass black hole binaries in the first and second observing runs of the Advanced LIGO and Virgo network

2019

Gravitational wave astronomy has been firmly established with the detection of gravitational waves from the merger of ten stellar mass binary black holes and a neutron star binary. This paper reports on the all-sky search for gravitational waves from intermediate mass black hole binaries in the first and second observing runs of the Advanced LIGO and Virgo network. The search uses three independent algorithms: two based on matched filtering of the data with waveform templates of gravitational wave signals from compact binaries, and a third, model-independent algorithm that employs no signal model for the incoming signal. No intermediate mass black hole binary event was detected in this sear…

All-sky search in early O3 LIGO data for continuous gravitational-wave signals from unknown neutron stars in binary systems

2021

Rapidly spinning neutron stars are promising sources of continuous gravitational waves. Detecting such a signal would allow probing of the physical properties of matter under extreme conditions. A significant fraction of the known pulsar population belongs to binary systems. Searching for unknown neutron stars in binary systems requires specialized algorithms to address unknown orbital frequency modulations. We present a search for continuous gravitational waves emitted by neutron stars in binary systems in early data from the third observing run of the Advanced LIGO and Advanced Virgo detectors using the semicoherent, GPU-accelerated, binaryskyhough pipeline. The search analyzes the most s…

Stability and extraction of bioactive sulfur compounds from Allium genus processed by traditional and innovative technologies

2017

Abstract Since ancient times, species from the Allium genus have been used in both culinary and medicinal applications. The health promoting properties, with well documented “evidence-based” studies, were attributed to the genus’ high content of bioactive organosulfur compounds. For these reasons, the organosulfur compounds have attracted interest in both food and pharmaceutical industries to be used as additives or supplements. Therefore, improvement in the extraction and stability during processing and storage of these molecules is crucial. The presented review documents the effects of traditional and innovative processing techniques on the extraction and stability of organosulfur compoun…

Electrochemical identification of flavonoid dyes in solid work of art samples by abrasive voltammetry at paraffin-impregnated graphite electrodes.

2004

Abstract An electrochemical method for identifying flavonoid-type dyes in microsamples from works of art is reported. Square wave voltammograms of natural insoluble dyestuffs based on flavonoid structure dragoon's blood, weld, old fustic, gamboge, Brazilwood and logwood (Campeche wood) attached to paraffin-impregnated graphite electrodes in contact with 0.25 M HAc + 0.25 M NaAc aqueous buffer display characteristic peaks in the potential region between +0.85 and −0.85 V versus AgCl/Ag. Sequential experiments in contact with 0.05 M AlCl 3 and 0.05 M Na 2 MoO 4 plus HAc/NaAc and 0.05 M H 3 BO 3  + 0.10 M NaOH solutions also provide dye-characteristic signals allowing for an unambiguous identi…

Millimeter-Wave Effects on Candida Albicans Cells

1985

In preliminary measurements, Candida albicans cultures exposed to 1 kHz square-wave-modulated microwaves at 72 GHz exhibited a significantly reduced number of colony-forming units in comparison with nonirradiated controls. To study whether the same effect could also be caused by continuous-wave (CW) irradiation, sedimented cells were exposed to either 1 kHz square-wave-modulated or CW microwaves at 72 GHz, with the same peak power. CW-exposed cells showed a higher growth rate (about 25%), whereas a reduction of about 15% was seen in cells exposed to square-wave-modulated microwaves in comparison with sham-exposed controls.

Phaenocompsopogon pustulatus n.gen.n. sp., a calcareous alga from the lacustrine rotliegend of the Saar-Nahe Basin (SW-Germany)

1992

Phaenocompsopogon pustulatus n. gen. n. sp. is a calcareous freshwater alga, probably of rhodophycean affinity. The fossils are mainly known from one locality in the Lower Permian of the Saar-Nahe Basin. The algal remains form a packstone in the Reckweilerhof-Bank of the Altenglan Formation. The simple thallus branches irregularly y-shaped and is covered with abundant pustules. An axial canal is characteristic, as are distinct cell features of an inner and outer cortex surrounding a structureless medulla. Most fossils are silicified and often three-dimensionally preserved. The algae lived in a wave-dominated environment, probably in offshore shallow water. The limited occurrence suggests sp…

Adiposity-Related Predictors of Vascular Aging From a Life Course Perspective : Findings From the Helsinki Birth Cohort Study

2022

Dynamics of boson stars and fermion-boson stars: a numerical-relativity panorama

2022

Los albores de la astronomía de ondas gravitacionales, actualmente liderada por la Colaboración LIGO-Virgo-KAGRA, abren un nuevo canal para inspeccionar la verdadera naturaleza de los objetos compactos oscuros. Los miembros más convincentes de esta categoría son los agujeros negros, de los que se cree ampliamente que están bien descritos por la métrica de Kerr cerca del equilibrio. Se han propuesto varias posibilidades teóricas más exóticas, denominadas imitadores de agujeros negros, ya que sus propiedades y dinámica se parecen en ciertos aspectos a las de los agujeros negros. Entre esos objetos compactos oscuros alternativos, las estrellas bosónicas, descritas por un campo escalar o vector…