92 research outputs found
Tackling different aspects of drone services utilizing technologies from cross-sectional industries
Enabling autonomous and Beyond Visual Line of Sight (BVLOS) operation
of Unmanned Aerial Vehicles (UAVs) in the Very Low Level (VLL) airspace requires
further advancement of technologies such as sensing the environment or secure and reliable
communication. This paper addresses these challenges by presenting solutions developed within
the project Airborne Data Collection on Resilient System Architectures (ADACORSA). Here,
findings from cross-sectional areas such as the automotive industry are being further enhanced
to fulfill the demands of aviation, in particular for use in the UAV domain. The developed
technologies include an advanced Ethernet-based deterministic network for reliable onboard
communication, a multi-sensor architecture for sensing the spatial environment as well as a
multi-link communication gateway that provides reliable communication to the ground and a
secure handover architecture.ADACORSA has received funding from the ECSEL Joint Undertaking (JU) and National
Authorities under grant agreement No 876019. Follow www.adacorsa.eu for more informatio
Microbiota of Exposed Root Surfaces After Fluoride, Chlorhexidine, and Periodontal Maintenance Therapy: A 3â Year Evaluation
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142203/1/jper1580.pd
Some Aspects of Rotational and Magnetic Energies for a Hierarchy of Celestial Objects
Celestial objects, from earth like planets to clusters of galaxies, possess
angular momentum and magnetic fields. Here we compare the rotational and
magnetic energies of a whole range of these celestial objects together with
their gravitational self energies and find a number of interesting
relationships. The celestial objects, due to their magnetic fields, also posses
magnetic moments. The ratio of magnetic moments of these objects with the
nuclear magnetic moments also exhibits interesting trends. We also compare
their gyromagnetic ratio which appears to fall in a very narrow range for the
entire hierarchy of objects. Here we try to understand the physical aspects
implied by these observations and the origin of these properties in such a wide
range of celestial objects, spanning some twenty orders in mass, magnetic field
and other parameters.Comment: 12 pages, 37 equation
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The integration of renewable energy sources into electric power transmission systems
Renewable energy technologies such as photovoltaics, solar thermal power plants, and wind turbines are nonconventional, environmentally attractive sources of energy that can be considered for electric power generation. Many of the areas with abundant renewable energy resources (very sunny or windy areas) are far removed from major load centers. Although electrical power can be transmitted over long distances of many hundreds of miles through high-voltage transmission lines, power transmission systems often operate near their limits with little excess capacity for new generation sources. This study assesses the available capacity of transmission systems in designated abundant renewable energy resource regions and identifies the requirements for high-capacity plant integration in selected cases. In general, about 50 MW of power from renewable sources can be integrated into existing transmission systems to supply local loads without transmission upgrades beyond the construction of a substation to connect to the grid. Except in the Southwest, significant investment to strengthen transmission systems will be required to support the development of high-capacity renewable sources of 1000 MW or greater in areas remote from major load centers. Cost estimates for new transmission facilities to integrate and dispatch some of these high-capacity renewable sources ranged from several million dollars to approximately one billion dollars, with the latter figure an increase in total investment of 35%, assuming that the renewable source is the only user of the transmission facility
The Clinical Translation Gap in Child Health Exercise Research: A Call for Disruptive Innovation
In children, levels of play, physical activity, and fitness are key indicators of health and
disease and closely tied to optimal growth and development. Cardiopulmonary exercise
testing (CPET) provides clinicians with biomarkers of disease and effectiveness of
therapy, and researchers with novel insights into fundamental biological mechanisms
reflecting an integrated physiological response that is hidden when the child is at rest.
Yet the growth of clinical trials utilizing CPET in pediatrics remains stunted despite the
current emphasis on preventative medicine and the growing recognition that therapies
used in children should be clinically tested in children. There exists a translational gap
between basic discovery and clinical application in this essential component of child
health. To address this gap, the NIH provided funding through the Clinical and
Translational Science Award (CTSA) program to convene a panel of experts. This
report summarizes our major findings and outlines next steps necessary to enhance
child health exercise medicine translational research. We present specific plans to
bolster data interoperability, improve child health CPET reference values, stimulate
formal training in exercise medicine for child health care professionals, and outline
innovative approaches through which exercise medicine can become more accessible
and advance therapeutics across the child health spectrum
Acute symptomatic hypoglycaemia mimicking ischaemic stroke on imaging:a systemic review
<p>Abstract</p> <p>Background</p> <p>Acute symptomatic hypoglycaemia is a differential diagnosis in patients presenting with stroke-like neurological impairment, but few textbooks describe the full brain imaging appearances. We systematically reviewed the literature to identify how often hypoglycaemia may mimic ischaemic stroke on imaging, common patterns and relationships with hypoglycaemia severity, duration, clinical outcome and add two new cases.</p> <p>Methods</p> <p>We searched EMBASE and Medline databases for papers reporting imaging in adults with symptomatic hypoglycaemia. We analysed the clinical presentation, outcome, brain imaging findings, duration and severity of hypoglycaemia, time course of lesion appearance, including two new cases.</p> <p>Results</p> <p>We found 42 papers describing computed tomography or magnetic resonance imaging in 65 patients, plus our two cases with symptomatic hypoglycaemia. Imaging abnormalities on computed tomography and magnetic resonance were uni or bilateral, cortical or sub-cortical. Thirteen (20%) mimicked cortical or lacunar stroke. Acute lesions had restricted diffusion on magnetic resonance or low attenuation on computed tomography, plus swelling; older lesions showed focal atrophy or disappeared, as with ischaemic stroke. The association between the depth or duration of hypoglycaemia, the severity or extent of neurological deficit, and the imaging abnormalities, was weak.</p> <p>Conclusion</p> <p>Imaging abnormalities in patients with hypoglycaemia are uncommon but very variable, weakly associated with neurological deficit, and about a fifth mimic acute ischaemic stroke. Blood glucose testing should be routine in all patients with acute neurological impairment and hypoglycaemia should be included in the differential diagnosis of imaging appearances in patients presenting with acute stroke.</p
Spatially Explicit Analysis of Metal Transfer to Biota: Influence of Soil Contamination and Landscape
Concepts and developments for a new field in ecotoxicology, referred to as âlandscape ecotoxicology,â were proposed in the 1990s; however, to date, few studies have been developed in this emergent field. In fact, there is a strong interest in developing this area, both for renewing the concepts and tools used in ecotoxicology as well as for responding to practical issues, such as risk assessment. The aim of this study was to investigate the spatial heterogeneity of metal bioaccumulation in animals in order to identify the role of spatially explicit factors, such as landscape as well as total and extractable metal concentrations in soils. Over a smelter-impacted area, we studied the accumulation of trace metals (TMs: Cd, Pb and Zn) in invertebrates (the grove snail Cepaea sp and the glass snail Oxychilus draparnaudi) and vertebrates (the bank vole Myodes glareolus and the greater white-toothed shrew Crocidura russula). Total and CaCl2-extractable concentrations of TMs were measured in soils from woody patches where the animals were captured. TM concentrations in animals exhibited a high spatial heterogeneity. They increased with soil pollution and were better explained by total rather than CaCl2-extractable TM concentrations, except in Cepaea sp. TM levels in animals and their variations along the pollution gradient were modulated by the landscape, and this influence was species and metal specific. Median soil metal concentrations (predicted by universal kriging) were calculated in buffers of increasing size and were related to bioaccumulation. The spatial scale at which TM concentrations in animals and soils showed the strongest correlations varied between metals, species and landscapes. The potential underlying mechanisms of landscape influence (community functioning, behaviour, etc.) are discussed. Present results highlight the need for the further development of landscape ecotoxicology and multi-scale approaches, which would enhance our understanding of pollutant transfer and effects in ecosystems
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