Search results for "current"
showing 10 items of 2224 documents
Fractional Modeling of the AC Large-Signal Frequency Response in Magnetoresistive Current Sensors
2013
Fractional calculus is considered when derivatives and integrals of non-integer order are applied over a specific function. In the electrical and electronic domain, the transfer function dependence of a fractional filter not only by the filter order n, but additionally, of the fractional order α is an example of a great number of systems where its input-output behavior could be more exactly modeled by a fractional behavior. Following this aim, the present work shows the experimental ac large-signal frequency response of a family of electrical current sensors based in different spintronic conduction mechanisms. Using an ac characterization set-up the sensor transimpedance function is obtain…
Current challenges and perspectives in gas fluxes biotreatment
2020
Abstract Nowadays, there is a wide variety of bioreactor configurations to treat specific pollutants from gas streams; however, biotechnologies share benchmark aspects that are herein described. In this chapter, the reader is introduced to the biological gas treatment field by means of a historical overview on how the initial devices used for gas treatment evolved to the innovative systems that are currently applied worldwide. The technical and operational fundamentals of biofilters, biotrickling filters, bioscrubbers, and emerging technologies such as two-phase partitioning bioreactors, multistage systems, and membranes are included. Perspectives and key research niches in the field are al…
Transnational Social Networks—Current Perspectives
2012
“[T]here is something mysterious about social networks. We live surrounded by them, but usually cannot see more than one step beyond the people we are directly connected to, if that. It is like being stuck in a traffic jam surrounded by cars and trucks. The traffic helicopter can see beyond our immediate surroundings and suggest routes that might extricate us. Network analysis is like that helicopter. It allows us to see beyond our immediate circle.” (Kadushin, 2012: 4)
Dynamics of sediments along with their core properties in the Monastir-Bekalta coastline (Tunisia, Central Mediterranean)
2017
International audience; The authors report on two campaigns of high-resolution samplings along the shores of Monastir Bay in Tunisia: the first being a study of sediment dynamics, grain size and mineral composition in surface sediment, and the second, eight months later, using four sediment cores to study grain-size distribution in bottom sediments. Particle size analysis of superficial sediment shows that the sand in shallow depths is characterized by S-shaped curves, indicating a certain degree of agitation, possible transport by rip currents near the bottom and hyperbolic curves illustrating heterogeneity of sand stock. The sediments settle in a relatively calm environment. Along the bay…
Submarine deposits from pumiceous pyroclastic density currents traveling over water: An outstanding example from offshore Montserrat (IODP 340)
2017
© 2016. Geological Society of America. All right reserved. Pyroclastic density currents have been observed to both enter the sea, and to travel over water for tens of kilometers. Here, we identified a 1.2-m-thick, stratified pumice lapilli-ash cored at Site U1396 offshore Montserrat (Integrated Ocean Drilling Program [IODP] Expedition 340) as being the first deposit to provide evidence that it was formed by submarine deposition from pumice-rich pyroclastic density currents that traveled above the water surface. The age of the submarine deposit is ca. 4 Ma, and its magma source is similar to those for much younger Soufrière Hills deposits, indicating that the island experienced large-magnitu…
Sicilian transitional waters: Current status and future development
2010
To appraise the current knowledge of Sicilian transitional waters (TWs), a review was undertaken of the information available on these ecosystems. In detail, a synthesis of the current status is reported, highlighting for each area the ecological features and status, historical data, conservation regime, environmental emergencies and anthropic pressures to which they are subject. The Sicilian TWs reviewed include coastal ponds and lakes, mires and areas with active and nonactive saltworks. Almost all of these ecosystems are affected by several protection regimes because of their high naturalistic value, although current knowledge is limited and fragmented. A few areas have received more att…
Culture and current account balances
2014
This article contributes to the literature of current account balances by introducing cultural variables that until now have been omitted. The World Values Survey indicates that the Roman Catholics do not consider thrift as important as others. We propose that Catholic countries tend to run current account deficits. This result remains robust even if we control for close to all of the determinants that have been included in previous studies. We find evidence that the inclination of Catholic countries to have high levels of uncertainty avoidance goes to a great length in explaining the result. peerReviewed
Suitability of the VOF Approach to Model an Electrogenerated Bubble with Marangoni Micro-Convection Flow
2022
When a hydrogen or oxygen bubble is created on the surface of an electrode, a micro-convective vortex flow due to the Marangoni effect is generated at the bottom of the bubble in contact with the electrode. In order to study such a phenomenon numerically, it is necessary to be able to simulate the surface tension variations along with a liquid-gas interface, to integrate the mass transfer across the interface from the dissolved species present in the electrolyte to the gas phase, and to take into account the moving contact line. Eulerian methods seem to have the potential to solve this modeling. However, the use of the continuous surface force (CSF) model in the volume of fluid (VOF) framew…
What is the value of eGovernment – and how can we actually realize it?
2009
PurposeThe purpose of this paper is to promote academic discourse around the understanding of the concept of value of eGovernment and how a diverse set of benefits or values can be realized from eGovernment efforts.Design/methodology/approachThe paper is designed as a viewpoint paper with emphasis on grounding a set of arguments on current practice and relevant scholarly papers.FindingsAlthough not based on a formal, structured review, the paper proposes that the concept of value in relation to eGovernment is insufficiently discussed and defined in the eGovernment literature. Based on the high failure rates of eGovernment efforts, it further proposes that structured approaches to benefits r…
Long-Run Determinants and Short-Run Dynamics of the Trade Balance in the Eu-15 Countries
2016
Several studies have analyzed the long-run determinants of current account balances using panel cointegration techniques. In this paper we will study both the long-run determinants and the short-run dynamics of the trade balances in the EU-15 countries. We will analyze each country separately and decompose the aggregate trade balance into the intra balance (trade balance vis-a-vis euro area) and the extra balance (trade balance vis-a-vis the rest of the world). Overall, our results suggest that there are significant differences in the long-run relations across the EU-15 countries which might be overlooked in the panel cointegration studies. In most of the countries there is a long-run coint…