Letteratura scientifica selezionata sul tema "Sea current power"
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Articoli di riviste sul tema "Sea current power":
1
McCormick, Michael E., e R. Cengiz Ertekin. "Renewable Sea Power". Mechanical Engineering 131, n. 05 (1 maggio 2009): 36–39. http://dx.doi.org/10.1115/1.2009-may-4.
Abstract (sommario):
This article discusses various aspects of research funding that seeks to use waves, tides, and thermal in different useful ways. The Department of Energy (DOE) program is set to explore technology that aims to harness some of the ocean’s energy and put it to work. It also presents a conception of a field of water mills designed by Marine Current turbines that turn the currents of tides into electricity. The researchers believe that the tidal energy resource is both reliable and predictable. With the escalating costs of oil and natural gas, it will become a viable resource soon. The DOE’s new program in marine renewable energies is an attempt to tap into a vast resource. Electrical utilities and private companies have made early commitments to participate in the centers. While conducting their own research, the universities will assist in the establishment of ocean field-testing sites and help the DOE keep a recently created marine renewable energy data base up to date.
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Ehrenman, Gayle. "Current From Currents". Mechanical Engineering 125, n. 02 (1 febbraio 2003): 40–41. http://dx.doi.org/10.1115/1.2003-feb-2.
Abstract (sommario):
This article discusses that in the quest for renewable energy, the oceans’ tides and flow have gone largely untapped. Companies in the United Kingdom and Canada are trying to harvest the power of sea current through new application of an old technology: turbines. IT Power is using technology from its spin-off company, Marine Current Turbines, also in Hampshire. The technology consists of a pair of axial flow rotors that are roughly 50 to 65 feet in diameter. Each drives a generator via a gearbox, much like a wind turbine. Blue Energy Canada is also working the currents. Its approach differs from that of IT Power in two significant ways: orientation of the turbine blades and their arrangement. A study conducted in 2001 by Triton Consultants, based in Vancouver, BC, on behalf of BC Hydro (one of the largest electrical utilities in Canada), found that the cost to develop a current turbine site is rather high, but the cost of annual power generation would be low. The study considered a site at the Discovery Passage in British Columbia, which it speculated would run 7941-MW Marine Current Turbines spread over roughly 3922 acres.
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Almenhali, Abdulrahman, Hatem Alshamsi, Yaser Aljunaibi, Dheyab Almussabi, Ahmed Alshehhi e Hassan Bu Hilal. "Mini Solar and Sea Current Power Generation System". IOP Conference Series: Earth and Environmental Science 73 (luglio 2017): 012012. http://dx.doi.org/10.1088/1755-1315/73/1/012012.
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YILDIRIM, Alper. "Statistical characteristics, probability distribution, and power potential of sea water velocity in Turkey". European Mechanical Science 6, n. 4 (20 dicembre 2022): 285–97. http://dx.doi.org/10.26701/ems.1195271.
Abstract (sommario):
Sea currents have the potential to supply electricity from a renewable energy source to coastal regions. The assessment of the potential energy that could be generated is the first step toward developing this resource. In this study, the data was collected at 5 m and 35 m depths below the sea surface level, including sea current velocity and direction. A detailed field measurement, of the probability of sea water velocity at three stations (Antalya, Silivri, Istanbul) for 5 months is carried out. The sea current power density values in these stations were 10.41, 4.92, and 7.91 W/m2 at 5 m depth, respectively. Besides, average sea current power density values were seen to be closely arranged with 11.44, 4.07, and 9.06 W/m2 at 35 depths, respectively. In addition, statistical analysis applying Weibull and Rayleigh models is also presented. It is shown that the use of a Weibull probability distribution facilitates the analysis of sea velocity conditions and is also able to predict the power density with a high degree of accuracy. The results of this study are useful for the understanding of marine hydrodynamics of these areas, where sea current power projects may be started in Turkey.
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Ozturk, Mehmet, Cihan Sahin e Yalcin Yuksel. "Current power potential of a sea strait: The Bosphorus". Renewable Energy 114 (dicembre 2017): 191–203. http://dx.doi.org/10.1016/j.renene.2017.04.003.
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Pritchard, Robert S. "Sea-ice mechanical energy balance: nearshore Chukchi Sea, 1982". Annals of Glaciology 15 (1991): 63–72. http://dx.doi.org/10.3189/1991aog15-1-63-72.
Abstract (sommario):
The mechanical energy balance of sea ice provides information about ice dynamic behavior, driving forces and the constitutive law. The energy balance equation, formed as the product of ice velocity with the ice momentum balance equation, describes changes to the kinetic and potential energy densities as power is input to the ice by wind and current. The momentum balance equation may also be used to describe the ice-stress divergence, air stress, and water stress, but the scalar form of the energy balance is simpler to understand. This paper provides new interpretations of several terms in the energy balance equation, in particular power input by air and water stress and by sea-surface tilt. Barometric pressure fields and drifting buoys deployed on the Chukchi Sea ice cover during 1982 provide wind, ice motion and current measurements that allow each term in the energy balance equation to be evaluated as a function of time. Magnitudes of power input by wind and current show how the energy balance is decomposed and help describe the relative importance of these driving forces. In the nearshore Chukchi Sea during February, March and April 1982, both wind and current provided significant forcing of the ice. Ice stress was also important and, at times, dominated other terms in the mechanical energy balance.
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Pritchard, Robert S. "Sea-ice mechanical energy balance: nearshore Chukchi Sea, 1982". Annals of Glaciology 15 (1991): 63–72. http://dx.doi.org/10.1017/s0260305500009551.
Abstract (sommario):
The mechanical energy balance of sea ice provides information about ice dynamic behavior, driving forces and the constitutive law. The energy balance equation, formed as the product of ice velocity with the ice momentum balance equation, describes changes to the kinetic and potential energy densities as power is input to the ice by wind and current. The momentum balance equation may also be used to describe the ice-stress divergence, air stress, and water stress, but the scalar form of the energy balance is simpler to understand. This paper provides new interpretations of several terms in the energy balance equation, in particular power input by air and water stress and by sea-surface tilt. Barometric pressure fields and drifting buoys deployed on the Chukchi Sea ice cover during 1982 provide wind, ice motion and current measurements that allow each term in the energy balance equation to be evaluated as a function of time. Magnitudes of power input by wind and current show how the energy balance is decomposed and help describe the relative importance of these driving forces. In the nearshore Chukchi Sea during February, March and April 1982, both wind and current provided significant forcing of the ice. Ice stress was also important and, at times, dominated other terms in the mechanical energy balance.
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Wijaya Kusuma, I. G. B., e Rukmi Sari Hartati. "Design of Sea Currents Turbine". Applied Mechanics and Materials 758 (aprile 2015): 113–18. http://dx.doi.org/10.4028/www.scientific.net/amm.758.113.
Abstract (sommario):
. Research on sea current energy uses as a sea current electrical power plant (PLTAL) in the region of Lembongan-Nusa Penida-Ceningan carried out since 2013, aiming to meet the demand for electricity in the coastal areas and remote islands. This study aims to design a marine current turbine which is planned to generate electricity of about 50 kW, with a construction system made fixed and the turbine set inside that can spin revolving without interruption. Simulation model of the flow is done by using Computational Fluid Dynamics analysis, CFD. Simulations conducted in private with a variety of flow velocity and pressure of the sea water and various forms of channels. Based on the results obtained by simulation, the best flow of sea currents is with a slope angle of 300 with a channel length of 15 m where the flow speed of the turbine of about 39 m/s with a flow pressure of 201,426 Pa, which predicted to be capable of producing 1,500 kW turbine power.
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Özturk, Mehmet, Cihan Sahin e Yalcin Yuksel. "ANALYZING FLOW ENERGY POTENTIAL OF THE BOSPHORUS STRAIT". Coastal Engineering Proceedings, n. 36 (30 dicembre 2018): 76. http://dx.doi.org/10.9753/icce.v36.risk.76.
Abstract (sommario):
Ocean currents represent a potentially notable, currently untapped, reservoir of energy. The regions with strong current velocities such as narrow straits connecting two water bodies exhibit high current energy (power) potential especially where the water depths are relatively shallow (EECA, 2009). The Bosphorus, connecting the Black Sea to the Sea of Marmara, is a typical narrow sea strait that generally exhibits a two-layered flow pattern: the upper layer current flows south towards the Sea of Marmara while the underlying current flows in opposite direction towards the Black Sea (Yüksel et al., 2008). The predominant mechanisms for the upper and lower layer flows are the higher water level of the Black Sea and the denser water of the Sea of Marmara, respectively.
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CHIRIAC, Olga R. "POLITICAL THREATS TO ENERGY SECURITY IN THE BLACK SEA". Romanian Military Thinking 2021, n. 3 (novembre 2021): 142–57. http://dx.doi.org/10.55535/gmr.2021.3.08.
Abstract (sommario):
The International World Order is the system of states we function in. It has been the dominant narrative, especially since 2014, that revisionist powers are trying to challenge and destabilise the order and replace it with one where they influence geopolitical outcomes exclusively in their favour and exert much more power than they would be able to in the current international system. This competition for strategic dominance is often called Great Power Competition having the US as the centre and the Russian Federation and the People’s Republic of China as challenger great powers. The overall purpose of the current study is to succinctly analyse Russia’s approach to grand strategy and understanding national interest, and to apply the mentioned aspects to the energy realm specifically, all the while being geographically focused on the Black Sea
Tesi sul tema "Sea current power":
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Metzger, Philippe. "Enjeux socio-économiques des énergies marines renouvelables en France : étude holistique de l'énergie thermique des mers". Electronic Thesis or Diss., Paris 8, 2019. http://www.theses.fr/2019PA080070.
Abstract (sommario):
Les énergies marines renouvelables (EMR) représentent un potentiel de production électrique pouvant couvrir le besoin mondial. Elles sont donc porteuses de facteurs socio-économiques qu'il convient de mesurer. Le premier niveau de recherche nécessite de créer un outil de mesure, appelé coefficient de tendance, pouvant indiquer quelle technologie de captation et de production est la plus pérenne à terme.Le deuxième axe de la recherche a ensuite porté sur l'énergie thermique des mers (ETM) car son coefficient de tendance est le plus élevé. Cette étude montre le changement de paradigme latent contenu par l'ETM pour une production abondante, permanente et propre d'une électricité nécessaire à terme, et pour une autonomie énergétique des territoires insulaires, notamment pour les espaces ultra-marins français, permettant de rompre leur dépendance aux énergies fossiles, coûteuses et polluantes. Dans ces régions, soumises de surcroît à un chômage massif et à un stress hydrique endémique, l'ETM apporte des créations d'emplois et des produits secondaires à l'électricité, dont de l'eau douce. Les EMR contiennent ainsi les fondements d'une mutation des territoires insulaires vers une autonomie énergétique pouvant contribuer à leur développement international sur d'autres critères que le tourismeRenewable Marine energies (RME) have an electricity production potential able to supply the worldwide needs. Therefore they carry socioeconomics factors which measurement is requested. A first level of research requires the creation of a metrics, called the trend coefficient, in order to show which caption and production technology is the most reliable in the next years.The second research work has then been developed on Ocean thermal energy conversion (OTEC) since its trend coefficient in the highest. This study shows how a latent paradigm change is held in OTEC for an extensive, continuous and clean supply, and for an energetic independence profitable to the island territories, specifically for the French ultra-marine spaces, giving the opportunity to break with their fossil resources dependency, expensive and polluting. In these areas, which have to face a massive unemployment and an endemic water stress, OTEC brings jobs and complementary products such as fresh water. The RME therefore hold the foundations of the island territories towards an energetic independence being able to help their worldwide development in other directions than tourism
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Figueredo, Ricardo Souza. "Corrente de fuga em inversores monofásicos sem transformador para conexão de sistemas fotovoltaicos à rede de distribuição de energia elétrica: análise e proposta de filtro passivo integrado de modo comum e diferencial". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-20072016-092205/.
Abstract (sommario):
Este trabalho apresenta um estudo sobre a corrente de fuga de modo comum em inversores monofásicos sem transformador utilizados para a conexão de sistemas fotovoltaicos (FV) à rede de distribuição de energia elétrica. O estudo se concentra em inversores do tipo fonte de tensão que empregam a topologia em ponte completa. A partir da adequada modelagem do sistema (rede, conversor e módulo fotovoltaico) identifica-se e quantifica-se a contribuição das tensões de modo comum e modo diferencial para a corrente de fuga. Conclui-se que a tensão de modo comum de alta frequência produzida pelo inversor, que depende da estratégia de modulação por largura de pulso (PWM Pulse Width Modulation) empregada, fornece a maior contribuição para produção da corrente de fuga. Esse estudo mostra que os inversores sem transformador, com topologia em ponte completa e modulação que produz tensão de saída com três níveis, necessitam de medidas adicionais para a minimização da corrente fuga quando aplicados em sistemas fotovoltaicos conectados à rede. Algumas soluções propostas na literatura para a minimização da corrente de fuga baseadas em topologias modificadas e filtros de modo comum são listadas e discutidas. Neste trabalho é proposto um filtro integrado de modo comum e modo diferencial com amortecimento passivo de baixas perdas, para minimizar a corrente de fuga produzida por um inversor monofásico sem transformador. Um exemplo de aplicação do filtro proposto é apresentado juntamente com seu procedimento de projeto, resultados de simulação e experimentais que validam a proposta. Além disso, a influência da variação da indutância da rede elétrica e da capacitância parasita do sistema fotovoltaico no comportamento do filtro proposto é analisada. A influência da variação da indutância da rede no comportamento do sistema de controle e o impacto da corrente de modo comum no projeto dos indutores do lado do conversor também são analisados.This paper presents a study on the common mode leakage current in single-phase transformerless inverters for grid-connected photovoltaic (PV) systems. The study focuses on voltage source inverters (VSI) employing the full-bridge topology. The common mode and differential mode voltages that contribute to the leakage current are identified and quantified from the analysis of the system model (utility grid, converter and PV module). The system model analysis shows that the high frequency common mode voltage produced by the inverter, which depends on the Pulse Width Modulation (PWM) strategy, is the main source contributing to the leakage current. This work shows that transformerless inverters employing the full-bridge topology and a modulation strategy that produces a three-level output voltage require some leakage current minimization strategy when they are employed in grid-connected PV systems. Some solutions proposed in the literature for leakage current minimization based on modified topologies and common mode filters are listed and discussed. In this dissertation an integrated common and differential filter with low loss passive damping is proposed to minimize the leakage current produced by a single-phase transformerless PV inverter. An application example of the proposed filter is presented with design procedure, simulation and experimental results validating the proposal. Additionally, the influence of grid inductance and PV module parasitic capacitance variations on the behavior of the proposed filter is analyzed. The behavior of the control system considering the grid inductance variation and the impact of the common mode current on the converter side inductors design are also analyzed.
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Lin, Chang-ching, e 林彰慶. "A study of water turbine power efficiency suitable for periodical ocean current in Penghu sea region". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/03256129899142129678.
Abstract (sommario):
碩士國立中山大學
機械與機電工程學系研究所
99
This thesis investigates a horizontal water turbine blade designed to suit the periodical ocean current in Penghu sea region. Blade element momentum theory is exploited to design blade profiles. Then, CFD software, Fluent, is used to obtain such simulation result for torque, power, and efficiency. Firstly, performance of turbines with various cross-sectional profiles is discussed. Then, we use quasi-steady method to simulate power output of turbines from periodical ocean current and estimate how much ocean current energy we can obtain per day. Further, the performance of a turbine installed for different immersed depth from the surface is investigated. Our studies show that airfoil profile NACA6409 can outperform others in terms of high lift/drag ratio under low Reynolds number, and better hydrodynamic properties help the water turbine obtain higher torque and power output. A water turbine designed by using NACA6409, at R=1 m, at uniform velocity=2 m/s is estimated to generate 5KW output power. On condition of periodical current flow, the ebb tidal current can rotate water turbine, but power output is only 0.54 times of flood tidal current. The water turbine can generate more power when it is sited in deeper water, and less torque when it is sited near the water surface.
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Hutchinson, David Karel. "Wind Stress Parameterisation in the Southern Ocean". Thesis, 2008. http://hdl.handle.net/1885/47691.
Abstract (sommario):
Wind stress is often parameterised in ocean-atmosphere coupled models by a quadratic function of atmosphere velocity. Strictly speaking, this drag law should be a quadratic function of the difference between the ocean and atmosphere velocities. The two schemes give very similar magnitudes of stress, however the power input is significantly reduced under the velocity difference stress. This work is the first to model this effect in the Southern Ocean. The velocity difference stress is found to reduce power input, but paradoxically the circumpolar transport is increased. The increase in transport is a consequence of two main factors: eddy saturation of the Antarctic Circumpolar Current, and eddy damping under the velocity difference stress.
¶
The wind stress parameterisation is also modified, by coupling the quadratic drag law to the temperature difference between the ocean and atmosphere. This simple representation is shown to be consistent with scatterometer observations, and the coupling constant is calibrated using known correlations between gradients of stress and sea surface temperature. Unlike the velocity difference stress, the temperature coupled stress is found to have a negligible effect on the mean flow in this model.
Libri sul tema "Sea current power":
1
Peppas, Lynn. Ocean, tidal, and wave energy: Power from the sea. New York, NY: Crabtree, 2008.
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Zuev, Sergey, Ruslan Maleev e Aleksandr Chernov. Energy efficiency of electrical equipment systems of autonomous objects. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1740252.
Abstract (sommario):
When considering the main trends in the development of modern autonomous objects (aircraft, combat vehicles, motor vehicles, floating vehicles, agricultural machines, etc.) in recent decades, two key areas can be identified. The first direction is associated with the improvement of traditional designs of autonomous objects (AO) with an internal combustion engine (ICE) or a gas turbine engine (GTD). The second direction is connected with the creation of new types of joint-stock companies, namely electric joint-stock companies( EAO), joint-stock companies with combined power plants (AOKEU).
The energy efficiency is largely determined by the power of the generator set and the battery, which is given to the electrical network in various driving modes.
Most of the existing methods for calculating power supply systems use the average values of disturbing factors (generator speed, current of electric energy consumers, voltage in the on-board network) when choosing the characteristics of the generator set and the battery. At the same time, it is obvious that when operating a motor vehicle, these parameters change depending on the driving mode. Modern methods of selecting the main parameters and characteristics of the power supply system do not provide for modeling its interaction with the power unit start-up system of a motor vehicle in operation due to the lack of a systematic approach.
The choice of a generator set and a battery, as well as the concept of the synthesis of the power supply system is a problem studied in the monograph.
For all those interested in electrical engineering and electronics.
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Sibikin, Mihail. Alternative energy sources. ru: INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1862890.
Abstract (sommario):
The textbook examines the current state and prospects of using solar, wind, geothermal water, small rivers, oceans, seas, secondary energy resources and other renewable energy sources in Russia and abroad. Examples of their implementation in the national economy are given.
The methods of assessing the prospects for the use of alternative energy sources are considered.
For students of energy and heat engineering areas of training and specialties 13.03.01 "Heat power engineering and heat engineering", 13.03.02 "Electric power engineering and electrical engineering", 13.02.10 "Electric machines and apparatuses", 13.02.11 "Technical operation and maintenance of electrical and electromechanical equipment (by industry)", as well as for engineering and technical workers involved in solving problems of use alternative energy sources.
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Co, Globe Newspaper, a cura di. Betrayal: The crisis in the Catholic Church. Boston: Little, Brown, 2002.
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Polivach, A., e P. Gudev. The IMEMO Sea Powers’ Rankings 2022 (2.0). Primakov National Research Institute of World Economy and International Relations, Russian Academy of Sciences (IMEMO), 23, Profsoyuznaya Str., Moscow, 117997, Russian Federation, 2022. http://dx.doi.org/10.20542/978-5-9535-0612-0.
Abstract (sommario):
This book describes a system of indexes, developed by Primakov National Research Institute of World Economy and International Relations (IMEMO) for evaluation of the overall maritime potential of a country. The Index of Maritime Might (IMM) is atop the system. This research includes the rankings of the top-100 countries according to their involvement in a variety of maritime activities (military, economic, science etc.), which were calculated on the basis of statistical data as of the 1st of January 2022. Current edition contains an updated version (2.0) of these indexes. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of IMEMO. The terms country, power and nation as used in this publication do not imply any judgment of the authors or of IMEMO concerning the legal status of any territory or the endorsement or acceptance of particular boundaries. These terms are used for research purposes only as maritime statistical data for a range of geographically self-contained economic areas are maintained on a separate and independent basis.
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Bateman, Sam. Maritime Security in East Asia: Cross Currents of Law, Politics and Strategy. Taylor & Francis Group, 2019.
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Polivach, A., e P. Gudev. The IMEMO Sea Powers’ Rankings 2023 (2.0). Primakov National Research Institute of World Economy and International Relations, Russian Academy of Sciences (IMEMO), 23, Profsoyuznaya Str., Moscow, 117997, Russian Federation, 2023. http://dx.doi.org/10.20542/978-5-9535-0619-9.
Abstract (sommario):
The IMEMO Sea Powers’ Rankings reports base on a system of indexes, developed by Primakov National Research Institute of World Economy and International Relations (IMEMO) for evaluation of the overall maritime potential of a country. The Index of Maritime Might (IMM) is atop this system. Current report includes the rankings of the top-100 countries according to their involvement in a variety of maritime activities (military, economic, science etc.), which were calculated based on statistical data as of the 1st of January 2023. This issue contains an updated version (2.0) of these indexes.
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Kreide, Regina, e Andreas Langenohl, a cura di. Conceptualizing Power in Dynamics of Securitization. Nomos Verlagsgesellschaft mbH & Co. KG, 2019. http://dx.doi.org/10.5771/9783845293547.
Abstract (sommario):
This volume addresses the ‘question of power’ in current constructivist securitisation studies. How can power relations that affect security and insecurity be analysed from both a transdisciplinary and historical point of view? The volume brings together contributions from history, art history, political science, sociology, cultural anthropology and law in order to determine the role of conceptions of power in securitisation studies, which has tended to be dealt with implicitly thus far. Using conceptual theoretical essays and historical case studies that cover the period from the 16th to the 21st century, this book portrays the dominant paradigms of critical security studies, which mostly stem from the field of international relations and see the state as a major focal point in securitisation, in a new light.
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Samuel, Geoffrey, e Linda H. Connor, a cura di. Healing Powers and Modernity. Praeger, 2001. http://dx.doi.org/10.5040/9798400662195.
Abstract (sommario):
What is the current state of traditional healing practices in contemporary Asian societies? How are their practitioners faring in the encounter with Western science and its biomedical approach? How are traditional healing practices being transformed by the politics of health within the modern nation-state and by the processes of commodification typical of modern economies? How do patients in Asian societies see the various healing options now open to them? The authors, all of whom are anthropologists, observe the clashes and complementarities between traditional therapies and biomedicine, which, in its many manifestations, is the dominant form of medicine supported by national governments, and is emblematic of the modernity to which they aspire. Some of the medical traditions, such as the sophisticated herbal-humoral systems of Tibetan medicine and Indian Ayurveda, are becoming well known in the West, both through scholarly study and through their increasing popularity with Western patients interested in their healing potential. This book adds a new dimension to their study, being focused unlike most previous writing on practice rather than textual tradition.
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Fox, Michael H. Why We Need Nuclear Power. Oxford University Press, 2014. http://dx.doi.org/10.1093/oso/9780199344574.001.0001.
Abstract (sommario):
Nuclear power may just be the most important solution to our search for clean, sustainable energy sources. Although wind and solar can contribute to our energy mix, we need a reliable source to meet large-scale energy demands and break our dependence on fossil fuels. However, most people are wary, if not downright afraid, of nuclear power. Given nuclear disasters such as Chernobyl and Fukushima, it's not difficult to see why. In the wake of these events, fear has clouded the public's understanding of the facts. It's time to clear up those misconceptions and examine the science behind nuclear power, in order to determine what role it could and should play in our future. In Why We Need Power: The Environmental Case, radiation biologist Michael H. Fox argues that nuclear power is essential to slowing down the impact of global warming. He examines the issue from every angle, relying on thirty-five years of research spent studying the biological effects of radiation. Fox begins with the problem, carefully laying out how our current energy uses and projections for the future will affect greenhouse gases and global warming. The book then evaluates each major energy source and demonstrates the limits of renewable energy sources, concluding that nuclear power is the best solution to our environmental crisis. Fox then delves into nuclear power, looking at the effects of radiation, the potential for nuclear accidents, and the best methods to dispose of nuclear waste. By systematically analyzing each aspect of the nuclear issue, Fox clarifies which concerns have a scientific basis and which remain unsupported. His in-depth exploration of the facts persuasively demonstrates that nuclear power is critical to reducing the effects of energy production on the global climate. Written in an engaging and accessible style, Why We Need Nuclear Power is an invaluable resource for both general readers and scientists interested in the facts behind nuclear energy.
Capitoli di libri sul tema "Sea current power":
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Marghany, Maged, e Nurimah Samnat. "Along-Track Interferometry TanDEM-X Satellite Data for Modelling Sea Surface Level Change and Sea Surface Current Velocity". In 10th International Conference on Robotics, Vision, Signal Processing and Power Applications, 489–96. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6447-1_62.
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Grabill, Meghan. "The Cost of Sea Level Rise for the Island Community of Vinalhaven, Maine: Spurring Action Through Collaborative Data Analysis". In Community Quality-of-Life and Well-Being, 73–86. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06940-6_5.
Abstract (sommario):
AbstractIn our Waypoints: Community Indicator series, the Island Institute, a community development organization, presents current data on the character along the coast and islands of Maine. Data show that climate change is already having detrimental effects on the island community of Vinalhaven, and the projections indicate it will only get worse. However, the topics of sea level rise and climate change are difficult to broach because of the complexity of the subject and the polarized views associated with it. An economic impact study, through collaboration with engaged community members, quantified the cost of sea level rise to the community if no action was taken. Through the work of data collaboration and the tenacity of the Sea Level Rise Committee, sentiment in Vinalhaven is slowly shifting and sea level rise is becoming an accepted fact. This book chapter will use the Vinalhaven example to explore the power of working with a community to forge ahead when a monumental problem seems insurmountable.
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Jüris, Frank. "Sino-Russian Scientific Cooperation in the Arctic: From Deep Sea to Deep Space". In Russia-China Relations, 185–202. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97012-3_10.
Abstract (sommario):
AbstractThis paper focuses on Sino-Russian scientific cooperation in the Arctic over the time period from 2012 to the current day. Academic cooperation with China entails more than meets the eye, as Chinese counterparts see the interactions with their partners from the prism of people-to-people diplomacy designed to create positive sentiment towards Chinese interests via non-governmental exchanges. The first part of this paper focuses on this engagement and Chinese attempts to steer the discourse in support of its interests in the Arctic.Foreign academics and leaders at the local level, untrained in the Chinese language and political system and unfamiliar with the hidden meanings of academic exchanges, become vulnerable and valuable targets for Chinese influence activities due to their high standing and access to valuable knowledge. The second part of the paper investigates the Sino-Russian scientific cooperation and capacity building that enables China to become a great maritime power—not always for the benefit of Russia, and to the disadvantage of NATO.
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Thomas, Felicity, e Peter Aggleton. "School-Based Sex and Relationships Education: Current Knowledge and Emerging Themes". In Global Perspectives and Key Debates in Sex and Relationships Education: Addressing Issues of Gender, Sexuality, Plurality and Power, 13–29. London: Palgrave Macmillan UK, 2016. http://dx.doi.org/10.1057/9781137500229_2.
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Liu, Mingxuan, Xinyang Fan, Danrong Song, Bin Zheng e Meng Zhang. "Fatigue Analysis Method of Steel Containment of Floating Nuclear Power Plant". In Springer Proceedings in Physics, 1046–59. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_88.
Abstract (sommario):
AbstractFloating nuclear power plant (FNPP) is a movable nuclear power plant built on the floating platform, which can provide clean and stable power for remote coastal areas, and are currently a hot research topic in the field of nuclear power. The steel containment is located in the reactor compartment of the FNPP and it is an important safety guarantee structure. Fatigue and fracture have been an important issue for ship and offshore structures for a long time. Fatigue failure of containment will have serious consequences.In order to research the fatigue life analysis method of steel containment of the first FNPP in China, the paper adopts miner linear cumulative damage theory and spectral analysis method, based on the American Society of Mechanical Engineers (ASME) standards and relevant standards of China Classification Society (CCS), and uses AQWA to analyze Wave load of FNPP. The hydrodynamic calculation results are imported into finite element model to analyze the structural response of each point of containment, and calibrate the transfer function data of each key point by using the linear system theory and regular wave periodic evaluation method. The fatigue analysis of each point is carried out according to the transfer function and the wave dispersion diagram drawn by the forty years monitoring sea conditions of the working sea area of the FNPP. The result shows that the fatigue life of steel containment is superior and meets the service requirements.
6
Knudsen, Magne. "Changing Tides: Temporal Dimensions of Low-Cost, High-Skill Fisheries in the Central Visayas, Philippines". In Case Studies in Biocultural Diversity from Southeast Asia, 21–42. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6719-0_2.
Abstract (sommario):
AbstractAt the southern mouth of the Tañon Strait—the body of water that separates the islands of Cebu and Negros in the Visayas region of the Philippines—small-scale fishing has always been challenging. Strong and complex sea currents make it difficult for fishers to utilise certain fishing gears. With a significant decline in the resource base and new regulations of the fisheries in recent decades, only fishers with advanced skills and fine-grained place-specific and calendric knowledge of the marine environment are able to catch enough fish, and the right kind of fish, to secure a decent return. Drawing on insights from cultural ecology, the chapter examines the skills and knowledges that fishers draw on to catch fish in this challenging environment. It gives particular attention to the temporal dimensions of the biocultural knowledge complex, showing how fishers’ knowledge of the links between sea currents, the lunar cycle and monsoon winds play into their decisions about where, when and how to fish. In addition to its direct livelihood significance, calendric knowledge also serves as a resource in the formation of identity as mananagat (fisherman) and authority and status within the fishing community. To further explain why some fishers are able to use their knowledge to make fishing a viable and legitimate livelihood and others are not, the last part of the chapter uses insights from political ecology to address issues of power and dynamics of exclusion in the fisheries.
7
Bönisch-Brednich, Brigitte. "Receiving the Gift of the Master’s Voice: How White Western Academic Paradigms Shape Knowledge and Remittance Economies: A De-Colonial Perspective". In Remittances as Social Practices and Agents of Change, 413–33. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-81504-2_18.
Abstract (sommario):
AbstractThis chapter explores the social, political, and cultural agents that drive the engines of gifting academic knowledge. It considers knowledge as a form of social remittance. Viewing knowledge transfers as remittance practices makes processes of (neo)colonial exchange flows visible. It also allows us to see such remittances as what they are: political and social scripts that determine legitimacy, value, and currency of knowledge in a world of economic and social inequalities. We can view knowledge according to Bourdieu as academic capital with skewed exchange rates. This chapter explores the question: How are the positions of sender and receiver linked to neo-colonial inequities? In a world system of university rankings, regionalized hubs of academic influence, money flows, and uneven power relationships, the exchange of knowledge and the definition of what constitutes knowledge is a fraught and fascinating topic when approaching it within a frame of remittance economy.
8
Wardle, Heather. "Challenging “Play”". In Games Without Frontiers?, 79–101. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74910-1_4.
Abstract (sommario):
AbstractOur understanding of when gaming ends and gambling begins is unclear. This has been hotly debated among theorists and the inclusion of gambling-like practices within digital games makes this even more indistinct, arguably subverting traditional notions of what it means to play. We are hyper-attuned to changes in game play because we know the learning power and potential of games and thus worry, rightly or wrongly, about their content: debate over loot boxes is the latest example of this. Whilst young people themselves have varied perspectives on whether wagering with or for in-game currency or items is gambling or not, they do tend to see these practices as coercive and as potentially addictive. They are acutely aware that these gambling-like mechanics do precisely what they were designed to—obtain money—raising broader questions about the ethics and responsibilities of the games industry as the creators of this content.
9
Čada, Karel, e Karina Hoření. "Governing Through Rituals: Regulatory Ritualism in Czech Migration and Integration Policy". In IMISCOE Research Series, 115–34. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67284-3_6.
Abstract (sommario):
AbstractThe Czech Republic has become the target of immigration over only the last three decades; currently, migrants compose 4.5% of the population. Governments in the previous decade have supported the vision of short-term labour migration, and foreigners face many administrative obstacles given the difficult legislation. We employ the concept of regulatory ritualism to grasp the distinctive features of the Czech system. Following Power (The audit society. Oxford University Press, Oxford, 1997) and Braithwaite (Regulatory capitalism: how it works, ideas for making it work better. Edward Elgar, Cheltenham/Northampton, 2008), we see regulation as a ritualised practice that comforts the public and cements the dominant normative order of migration policy. In this chapter, we introduce the historical and political context of migration policy, its institutional design, the Act on Residence of Foreign Nationals in the Czech Republic, the position of foreigners in Czech labour law, Czech integration policy and the consequences of recent institutional design for migrants. The main barriers of integration are difficult administration, poor knowledge of the language and precarious working conditions. Regulatory ritualism, a result of chaotic and unsystematic legislative work, is characterized by losing focus on achieving the goals or outcomes themselves, it establishes a climate of mutual distrust among those actors involved and places obstacles to collaboration between public authorities and migrants themselves.
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Bozarslan, Hamit. "The Margins of Academia or Challenging the Official Ideology". In Documenting the Armenian Genocide, 229–50. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-36753-3_12.
Abstract (sommario):
AbstractThis chapter highlights two intellectuals, both “ethnic Turks,” who have challenged Turkey’s huge scientific machines. Their scholarship demolished the credibility of the official, extremely rigid, and radically nationalist “social sciences” as they are practiced, in the past and currently in Turkish universities and research centers. The impact of their work and their intellectual audacity gave birth to new intellectual traditions in Turkey and shook international Turcology and “Turkish studies,” which constitute an important branch of Middle Eastern Studies.İsmail Besṃikçi earned a PhD in Sociology and seemed poised to obtain a position in the Turkish academic establishment. Through a series of sociological-ethnographic volumes published at the turn of the 1970s, however, he chose to show the centrality of the Kurdish issue in the very fabric of modern Turkey. In the second half of the 1970s, after he was fired from his university and spent several years in prison, he directly attacked the Kemalist academic establishment. Besṃikçi insisted that Kemalist power, far from being the initiator of modernity in Turkey, preserved, if not reinforced, pre- or profoundly anti-modern institutions, such as tribal leadership and religious brotherhoods, at least in the Kurdish region.The second intellectual, Taner Akçam, one of the main figures of the radical left in Turkey of the 1970s, was obliged to flee the country. One of his largely unknown first books, published in 1992, was not on the Armenian issue, but on torture and cruelty in the national history. That same year, he also published a path-breaking book on the Armenian issue. Akçam had very few archival resources at his disposal, but he was able to see the deeper sense of what scholars shyly called the “Armenian question”: questioning “1915” meant questioning the very foundation of Turkey, as a state, but also as a country and a society, with all her components, including the Kurdish one, and all her political trends, including the liberal and left-wing ones. Scholars working on contemporary Tukey had to establish the facts, describe what happened in 1915 by taking their distance from official history-writing, and, more importantly, understand how such an act could take place and how such a massive taboo on the genocide could have been institutionalized.
Atti di convegni sul tema "Sea current power":
1
Ali, Sy A., e Robert R. Moritz. "Rolls-Royce Power Generation Current Products and New Product Plans". In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0393.
Abstract (sommario):
Aero-derivative gas turbines have been successfully serving the power generation, mechanical drive, and marine markets for 40 years. These products are well suited for distributed generation, with sizes in the range from 3 MW to 50+ MW. The Rolls-Royce group of companies provide vertical integration for aero-derivative based energy systems, having marketing, sales, manufacturing, packaging, distribution, and customer service capabilities. The 3– 6 MW, 501-K family serves power generation and cogeneration applications. The new 6–8 MW 601 is used for cogeneration and mechanical drive. The 15 MW Avon is widely applied to mechanical drives, offering exceptional reliability and low life cycle cost. The RB211 provides over 30 MW at high efficiency, and is used in mechanical drive and electrical generation. The 42% efficient, 50 MW, Trent is primarily intended for electrical generation. This engine retains a higher than usual degree of commonality with aero production modules, thus retaining the cost advantage of high volume production and benefits from continuous improvements in aero engines. Plans: Cost reduction of mature existing products will be achieved by “industrialization”, e.g. by alloy changes and shape simplification, of parts no longer in aero production. Better integrated packaging and “more electric aircraft” features are rapidly becoming a necessity in the competitive marketplace. The trend is toward minimizing and possibly eliminating mechanical drives and other components in a gas turbine to improve product quality, efficiency, reduce product cost, while enhancing product quality and the environment. In this regard, the approach being taken near term is to substitute normal oil bearings with Active Magnetic Bearings. Such an action would help eliminate high cost skid lubrication system components and some environmental hazards as well as reducing maintenance. Several programs will make contributions to environmental improvements through reduced emissions and the use of “renewable” fuels. A prototype 501-K has been supplied to operate on gasified coal, a reduced emissions path to generating electricity from coal. A dual fuel DLE combustion system for very high pressure ratio and turbine temperature is in development for the Trent, having downward compatibility with other company products. The Next Generation Gas Turbine (NGGT) project, sponsored by the US Department of Energy, will use an existing engine core. Advanced modules, including a long life “spiral” recuperator and cycle enhancements combine to yield 50% cycle efficiency at a reduced cost per kW. The goal is to produce a 50 MW class plant with “combined cycle efficiency at simple cycle cost.” The NGGT is suited to using alternate fuel for part of the energy input. Following evaluation of fuel cell/gas turbine hybrids, a specially suited gas turbine development is being initiated with sponsorship by the U.S. Department of Energy. The company is also conducting a solid oxide fuel cell program. An auxiliary power unit(APU) was developed and is now in production for the M1 tank. A “microturbine” derivative of this product is being considered for distributed generation.
2
Laborenz, Jacob, Christian Siewert, Lars Panning, Jo¨rg Wallaschek, Christoph Gerber e Pierre-Alain Masserey. "Eddy Current Damping: A Concept Study for Steam Turbine Blading". In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59593.
Abstract (sommario):
In gas and steam turbine applications a common approach to prevent the blades from high cycle fatigue failures due to high vibration amplitudes is the usage of friction damping elements. Besides the intended amplitude reduction this procedure also features some possibly unwanted side effects like a shift in resonance frequencies due to stiffening effects caused by the contact. Thus, as an alternative an eddy current based non-contacting damping concept for the application in turbo machinery is investigated. In this paper two different types of eddy current dampers are considered. Theoretical models for both are established by applying electromagnetic-mechanical theory. The theoretical models are compared to forced response measurements that are performed at a stationary test rig.
3
Zilberstein, Vladimir, Robert Lyons, Andrew Washabaugh, Dave Grundy, Chris Craven, Neil Goldfine, Pramod Khandelwal, Tony Brozan e William J. Brindley. "Monitoring Diffusion Coating Aging With Multi-Frequency Eddy Current MWM Sensors". In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68884.
Abstract (sommario):
Diffusion coatings are widely used to protect hot gas path components in land-based gas turbines and jet engines. Effective nondestructive assessment of the aged coating and substrate condition is critical for support of refurbish/replace/run decisions. In this paper, we present results on aging characterization of nickel aluminide and platinum aluminide coatings. The measurements were performed using a Meandering Winding Magnetometer (MWM®) eddy current sensor over a wide range of frequencies. Single-channel MWM sensors and multichannel imaging MWM-Arrays permit tracking of features of interest for a population of components and provide new capabilities for inspecting gas turbine components. These conformable sensors allow convenient manual and automated inspection on complex surfaces. Results on coating aging assessment suggest that the multiple frequency MWM technique can be implemented for characterization of diffusion coatings and base metals before and after component refurbishment.
4
Jungbluth, Matthias, Vinay Jonnalagadda, Erwan Baleine, Mattias Broddega˚rd, Rolf Wilkenho¨ner e Paul Zombo. "Assessing of Hot Gas Parts Using Advanced Eddy Current Testing Methods". In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51535.
Abstract (sommario):
The turbine section of state-of-the-art industrial gas turbines is exposed to the most severe conditions such as high temperatures, corrosive environments and high mechanical stresses for several tens of thousands of hours. To withstand these conditions, turbine blades and vanes have become the most sophisticated parts. This, together with advanced manufacturing technologies, strict quality requirements and maximum reliability demands, affects costs. Different design features have been realized in the past to meet the ambitious requirements, and are also under constant development. Blades and vanes made of superalloys with directionally-solidified or single-crystal structure are used to provide highest strengths at temperatures as near as possible to the hot gas temperature. The high integrity and conformity of the parts are required to realize the material potential. Different advanced diagnostic methods are applied to ensure these over time. Another way to increase the operating temperatures of gas turbines is the application of corrosion and thermal protection coatings for one or several rows of the blades and vanes. Deviations in the specified coating thickness tend to reduce the lifetime of such coatings significantly. Hence, the monitoring of this property during the manufacturing requires special nondestructive diagnostic measures. Service exposed parts, which need to be refurbished when the protective coatings are spent, offer a significant operation potential after refurbishment. To guarantee the design parameters during the next service interval, several nondestructive material evaluation methods are available for the necessary part property assessment. Multifrequency Eddy Current has proven itself as an appropriate NDE technique to accomplish the above diagnostic requirements. The paper will give an overview of results gained at Siemens with model based Eddy Current methods using measurement systems developed by Jentek Sensors Inc., USA, and CESI, Italy. Potential applications and limitations of the method also will be discussed.
5
Goldfine, Neil, Darrell Schlicker, Yanko Sheiretov, Andrew Washabaugh, Vladimir Zilberstein e Timothy Lovett. "Conformable Eddy-Current Sensors and Arrays for Fleetwide Gas Turbine Component Quality Assessment". In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0212.
Abstract (sommario):
The conformable Meandering Winding Magnetometer (MWM™) eddy current sensors and MWM-Arrays provide new inspection capabilities for gas turbine components. The sensors provide measurements of coating thickness and absolute electrical conductivity, which can capture features of interest for a population of components, e.g., for tracking fleetwide trends in quality and aging, failure evaluations and correlating failure origins to features of specific fleet population segments. Inspection applications include metallic and nonmetallic coating thickness and porosity measurement, detection of cracks on complex surfaces, imaging and detection of small flaws, thermal degradation monitoring, and cold work quality assessment. For example, the US Air Force uses the MWM for cold work quality control on all of the C-130 propeller blades that go through the Warner Robins ALC. For P-3 and C-130 propeller blades, trend analysis is being performed fleetwide. This paper describes MWM technology advances for absolute property measurements and specific capability demonstrations. Multifrequency quantitative inversion methods used for coating characterization are also used for characterization of process-affected zones, such as shot peen quality or titanium alpha case characterization.
6
Ceschini, Giuseppe Fabio, e Federico Iozzelli. "Gas Turbines Axial Compressor NDE by Eddy Current Probes to Detect Corrosion Pitting". In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-60028.
Abstract (sommario):
Corrosion Pitting is a failure mode that appears in several cases in which there is a combination of Gas Turbines poor Inlet Filtration system (or wrong maintenance of it) and a particularly aggressive environment, characterized by presence of sulfides and chlorides. The corrosion pitting spots can cause crack initiation on the axial compressor blades and, with operation, go on propagating by HCF failure mechanism. This paper describes the application of a new type of Eddy Current probe, suitable to detect those very small spots on the first stage blades, avoiding to disassembly the gas turbine casings, in the very early stage of the corrosion phenomena. A specific experience on some LNG plants is reported.
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Chana, K. S., e D. N. Cardwell. "The Use of Eddy Current Sensor Based Blade Tip Timing for FOD Detection". In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50791.
Abstract (sommario):
Deterioration of rotor blades due to foreign object damage (FOD), erosion by sand/water, low cycle fatigue (LCF) and high cycle fatigue (HCF) all limit blade life, but cannot always be detected before a failure. The advent of tip-timing systems makes it possible to assess turbomachinery blade vibration using non-contact systems. However, these systems are still largely optical based and therefore suffer from contamination problems, further development of these systems is difficult due to problems associated with keeping the sensors clean. Experimental measurements have been carried out using an alternative eddy current sensor that has been validated in a series of laboratory and engine tests to measure rotor blade arrival times. A series of engine trials have been conducted to assess their capability for detection of pre-existing damage and the capture of dynamic foreign object damage (FOD) events. The results show that it is possible to acquire high quality blade timing data for use in engine condition monitoring. In addition for the detection of FOD created damage and FOD damage as it occurs.
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Kikukawa, Koki, e Shigeru Tabeta. "A Preliminary Study on Site Selection for Tidal Current Power Plants in Seto Inland Sea". In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77339.
Abstract (sommario):
Tidal current power generation is one of marine renewable energies whose merit is stable and predictable power generation. In the present study, a potential map of tidal current energy in Seto Inland Sea is developed on GIS from the datasets of hydraulic model experiments. Fisheries value maps are also developed from the database of fish catch for typical species in the target area. The developed maps are integrated through GIS, to investigate suitable locations for tidal current power plants in Seto Inland Sea. From the combined map considering both the economic value of tidal current power generation and the fishery, it is found that the areas with positive total value significantly decrease as damage rate on fishery becomes larger, though the areas with high energy potential of tidal current have larger total economic values even when the damage rate increases. On the other hand, some areas where the fishery value is small will become candidate site when the damage rate on fishery gets larger.
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Fukutomi, Hiroyuki, e Takashi Ogata. "Finite Element Modeling of the Eddy-Current Inspection of Land-Based Gas Turbine Blades". In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0031.
Abstract (sommario):
There has been a growing need in recent technology of gas turbines in combined cycle to assess the remaining life of high temperature components. It is also required that the nondestructive assessment be more accurate in maintaining combined cycle plants. This paper describes the use of a simulator solving forward and inverse problems under eddy current testing, in parametric studies of inspection parameters for 1100°C-class gas turbine blades in terms of test probe capabilities, frequencies and signal interpretation. The simulator is based on a differential formulation constructed with a magnetic vector potential and a 3-dimensional edge-based finite-element modeling method. Its features are forming coils and defects independent of a whole finite element model, very fast eddy current response predictions, and identifications of electromagnetic properties. Using the simulator, optimal sensor types and test frequencies are determined in terms of assessment of degradation, selectability between surface-breaking and subsurface cracks, reconstruction of crack profiles, and detection of multiple cracks.
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Cardwell, D. N., K. S. Chana e P. Russhard. "The Use of Eddy Current Sensors for the Measurement of Rotor Blade Tip Timing: Sensor Development and Engine Testing". In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50792.
Abstract (sommario):
The advent of tip-timing systems makes it possible to assess turbomachinery blade vibration using non-contact systems. Currently, the most widely used systems in industry are optical systems. However, these systems are still only used on development engines, largely because of contamination problems from dust, dirt, oil, water etc. Further development of these systems for in-service use is problematic because of the difficulty of eliminating contamination of the optics. Hence, alternatives need to be developed that are immune to contamination but have equivalent resolution and bandwidth as the optical system. Experimental measurements have been carried out using alternative sensors. An eddy current sensor has been developed in a series of laboratory and engine tests to measure rotor blade arrival times. Comparisons are made with an industry standard optical blade tip timing system. The results show that it is possible to acquire high quality blade tip timing data for use in engine condition monitoring using an eddy current sensor. This sensor allows measurements to be taken that do not suffer from flow contamination and allow deployment for hotter flow environments.
Rapporti di organizzazioni sul tema "Sea current power":
1
Anthony, Ian, Fei Su e Lora Saalman. Naval Incident Management in Europe, East Asia and South East Asia. Stockholm International Peace Research Institute, marzo 2023. http://dx.doi.org/10.55163/zzbg6990.
Abstract (sommario):
Unprecedented global turbulence in 2022 has demonstrated the need to pay increased attention to naval operations. Enhanced military capability allows naval power projection far beyond home waters. New threats and challenges are emerging from technological advances and new applications, not least the vulnerability of warships and naval facilities to cyber intrusions and cyberattacks. As states implement the programmes they need to protect and promote their interests at sea, there is also likely to be an increase in the number of close tracking incidents. How effective current risk reduction mechanisms will be at dealing with incidents at sea is unclear. This Insights Paper provides a preliminary assessment of the existing mechanisms and suggests areas for further improvement.
2
Elshurafa, Amro, Frank Felder e Nezar Alhaidari. Achieving Renewable Energy Targets Without Compromising the Power Sector’s Reliability. King Abdullah Petroleum Studies and Research Center, marzo 2022. http://dx.doi.org/10.30573/ks--2021-dp23.
Abstract (sommario):
Saudi Arabia’s Ministry of Energy has set ambitious renewable energy goals. Although the Kingdom’s current energy mix is dominated by conventional energy (>95%), it aims to draw 50% of its energy from renewable sources by 2030. Currently, the Kingdom enjoys very high solar photovoltaic potential, and it is also well positioned for wind generation. Thus, studying the reliability of highly renewable power systems and the impact of converting conventional generation to renewable energy is of paramount importance. The latter analysis is important because temperatures in the Kingdom are often high for a considerable portion of the year.
3
Tyson, Paul. Sovereignty and Biosecurity: Can we prevent ius from disappearing into dominium? Mέta | Centre for Postcapitalist Civilisation, 2021. http://dx.doi.org/10.55405/mwp3en.
Abstract (sommario):
Drawing on Milbank and Agamben, a politico-juridical anthropology matrix can be drawn describing the relations between ius and bios (justice and political life) on the one hand and dominium and zoe (private power and ‘bare life’) on the other hand. Mapping movements in the basic configurations of this matrix over the long sweep of Western cultural history enable us to see where we are currently situated in relation to the nexus between politico-juridical authority (sovereignty) and the emergency use of executive State powers in the context of biosecurity. The argument presented is that pre-19th century understandings of ius and bios presupposed transcendent categories of Justice and the Common Good that were not naturalistically defined. The very recent idea of a purely naturalistic naturalism has made distinctions between bios and zoe un-locatable and civic ius is now disappearing into a strangely ‘private’ total power (dominium) over the bodies of citizens, as exercised by the State. The very meaning of politico-juridical authority and the sovereignty of the State is undergoing radical change when viewed from a long perspective. This paper suggests that the ancient distinction between power and authority is becoming meaningless, and that this loss erodes the ideas of justice and political life in the Western tradition. Early modern capitalism still retained at least the theory of a Providential moral order, but since the late 19th century, morality has become fully naturalized and secularized, such that what moral categories Classical economics had have been radically instrumentalized since. In the postcapitalist neoliberal world order, no high horizon of just power –no spiritual conception of sovereignty– remains. The paper argues that the reduction of authority to power, which flows from the absence of any traditional conception of sovereignty, is happening with particular ease in Australia, and that in Australia it is only the Indigenous attempt to have their prior sovereignty –as a spiritual reality– recognized that is pushing back against the collapse of political authority into mere executive power.
4
King, Wayne. Process Control for Defect Mitigation in Laser Powder Bed Fusion Additive Manufacturing. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, maggio 2023. http://dx.doi.org/10.4271/epr2023011.
Abstract (sommario):
<div class="section abstract"><div class="htmlview paragraph">Success in metal additive manufacturing (AM) relies on the optimization of a large set of process parameters to achieve materials whose properties and performance meet design and safety requirements. Despite continuous improvements in the process over the years, the quality of AM parts remains a major concern for manufacturers. Today, researchers are starting to move from discrete geometry-dependent build parameters to continuously variable or dynamically changing parameters that are geometry- and scan-path aware. This approach has become known as “feedforward control.”</div><div class="htmlview paragraph"><b>Process Control for Defect Mitigation in Laser Powder Bed Fusion Additive Manufacturing</b> discusses the origins of feedforward control, its early implementations in AM, the current state of the art, and a path forward to its broader adoption.</div><div class="htmlview paragraph"><a href="https://www.sae.org/publications/edge-research-reports" target="_blank">Click here to access the full SAE EDGE</a><sup>TM</sup><a href="https://www.sae.org/publications/edge-research-reports" target="_blank"> Research Report portfolio.</a></div></div>
5
Dubois, Diego, Amirali Eskandariyun, Suprabha Das, Andriy Durygin e Zhe Cheng. Flash Sintering of Commercial Zirconium Nitride Powders. Florida International University, ottobre 2021. http://dx.doi.org/10.25148/mmeurs.009777.
Abstract (sommario):
Flash sintering is an electrical field-assisted densification technique that requires passing a current through a ceramic powder compact. Pressure-assisted flash sintering of commercially available Zirconium Nitride (ZrN) powders has been demonstrated. Near fully dense samples can be obtained within a short period of time. The influences of parameters such as electrical field strength, voltage ramping rate, current limit, external pressure, pre-heating, and holding time on the onset of the flash event were investigated. Some post-flash sintered samples were subjected to the same condition to observe if the material would experience repeated flash. In addition, material properties such as density and hardness were measured and correlated with SEM and XRD. Implications of the observations on underlying flash sintering mechanism will also be discussed.
6
Ozturk, Ibrahim. On the Political Economy of Populism: The Decline of the Turkish Economy under Erdoğan’s Populist-Authoritarian Regime. European Center for Populism Studies (ECPS), febbraio 2022. http://dx.doi.org/10.55271/pp0008.
Abstract (sommario):
Whether it adopts a right- or left-wing ideology or it is embraced as a belief or a set of ideals, and no matter the strategy or tactics, populism, in the final analysis, is a way of seizing power, and differences between the different strands carry significant repercussions. Many diverse economic, political, and cultural factors have been put forward to explain the rise of populism. One leader who has drawn increasing attention on the crest of the most recent wave of populism is Turkey’s incumbent president, Recep Tayyip Erdoğan. After a period of progressive and democratic leadership through to 2007, Erdoğan’s fundamental beliefs and personality surfaced, and the entire process was reversed, with devastating consequences for Turkey. This article argues that Erdoğan’s Islamist–nationalist populism has been one of the primary triggers of Turkey’s current political and economic meltdown. Moreover, his populist rhetoric has weakened Turkey’s already fragile autonomous institutions and paved the way for reform reversals and incoherent economic policy. Taken together, Erdoğanism has brought a woeful deterioration in macroeconomic indicators, including rampant inflation, mounting national debt, massive unemployment, rising poverty, and a profound currency shock.
7
Diarra, Aïssa. Addressing Inequalities in Global Health: UNU IIGH Strategic Plan 2024–2028. UNU-IIGH, 2023. http://dx.doi.org/10.37941/ar/2024/1.
Abstract (sommario):
UNU-IIGH identified Addressing Inequalities in Global Health as its core strategic focus for 2024-2028. This strategic focus aligns with the historical areas of interest and effort within UNU-IIGH, has the greatest potential for external influence and impact and aligns with the opportunity that currently exists in the global health sector for UNU-IIGH to occupy greater thought leadership on this issue. The new strategic plan encompasses four work packages- Gender Equality and Intersectionality, Power and Accountability, Digital Health Governance, and Climate Justice and Determinants of Health. At the core of this strategic plan lie multiple lenses that would inform all work. The Institute has taken power as the analytical entry point to apply a set of five interconnected lenses that will facilitate collaboration across the Work Packages to interrogate the structural underpinnings of health inequalities in global health—Intersectionality, Feminism, Decoloniality, Contextualisation, and Powerful Actors. Each Work Package will also draw on a combination of the following five tactics: Conducting Research and Analysis, Fostering Partnerships and Networks, Communicating Findings and Results, Advocating for Change, and Strengthening Capacity,
8
Muelaner, Jody E. Decarbonized Fuel Options for Civil Aviation. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, giugno 2023. http://dx.doi.org/10.4271/epr2023012.
Abstract (sommario):
<div class="section abstract"><div class="htmlview paragraph">Drop-in replacement biofuels and electrofuels can provide net-zero CO2 emissions with dramatic reductions in contrail formation. Biofuels must transition to second-generation cellulosic feedstocks while improving land and soil management. Electrofuels, or "e-fuels,” require aggressive cost reduction in hydrogen production, carbon capture, and fuel synthesis. Hydrogen has great potential for energy efficiency, cost reduction, and emissions reduction; however, its low density (even in liquid form) combined with it’s extremely low boiling temperature mean that bulky spherical tanks will consume considerable fuselage volume. Still, emerging direct-kerosene fuel cells may ultimately provide a superior zero-emission, energy-dense solution. </div><div class="htmlview paragraph"><b>Decarbonized Power Options for Civil Aviation </b>discusses the current challenges with these power options and explores the economic incentives and levers vital to decarbonization. Until common and enforceable global carbon pricing arrives, targeted national measures (e.g., mandates, price support, and finance) will be required.</div><div class="htmlview paragraph"><a href="https://www.sae.org/publications/edge-research-reports" target="_blank">Click here to access the full SAE EDGE</a><sup>TM</sup><a href="https://www.sae.org/publications/edge-research-reports" target="_blank"> Research Report portfolio.</a></div></div>
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Wolfmaier, Susanne, Adrian Foong e Christian König. Climate, conflict and COVID-19: How does the pandemic affect EU policies on climate-fragility? Adelphi research gemeinnützige GmbH, dicembre 2021. http://dx.doi.org/10.55317/casc018.
Abstract (sommario):
The links between climate change and conflict have been well-documented in recent observations and academic literature: far from being causally direct, these links often depend on specific conditions and occur through certain pathways (Koubi, 2019). For example, conflicts have been found to be more likely in areas with poor access to infrastructure and facilities (Detges, 2016), or where government distrust and political bias are prevalent (Detges, 2017). As such, climate change has often been described as a ‘threat multiplier’, making it imperative for security and development actors to consider these fragility risks collectively in their policies and strategies. In addition to the expected impacts of climate change on the European Union (EU), such as increasing temperatures, extreme weather events or rising sea levels, climate change also has “direct and indirect international security impacts” for the EU’s foreign- and security policy (Council of the European Union, 2016). These affect for example migration, food security, access to resources and socio-economic factors that possibly contribute to disruptions (ibid.). The resulting fragility may affect the EU by contributing to changes in geopolitical power dynamics, whilst at the same time needs for support in neighbouring and partner countries could increase (Brown, Le More & Raasteen, 2020). The EU has increasingly acknowledged climate-fragility risks over the last years, as is evident from several key foreign policy strategies, agreements, and decisions. The European Green Deal, for example, aims to cushion climate and environmental impacts that may exacerbate instability (European Commission, 2019). At the regional level, individual policies underline the links between climate impacts and security in partner regions, such as for the Sahel (Council of the European Union, 2021a) and the Neighbourhood (EEAS, 2021a), stressing the importance in tackling those risks. To that end, the EU has been at the forefront in providing multilateral support for its partner regions, through its various instruments related to climate, environment, development, and security. According to official EU sources, EU funding for official development assistance (ODA) rose by 15% in nominal terms from 2019 to €66.8 billion in 2020 (European Commission, 2021a). Furthermore, the share dedicated to climate action is also growing: the EU initiative Global Climate Change Alliance Plus (GCCA+) received an additional €102.5 million for the period 2014-2020 compared to the previous phase 2004- 2014 (European Commission, n.d.). Looking ahead, the EU’s recently approved Multiannual Financial Framework for 2021-2027 is set to provide €110.6 billion in funding for external action and pre-accession assistance to its Neighbourhood and rest of the world (European Commission, 2021b). Despite the increased recognition of climate-related fragility risks in EU policies and the funding committed to climate action and international development, implementation of concrete measures to address these risks are lagging behind, with only a handful of EUfunded projects addressing climate-fragility risks (Brown, Le More & Raasteen, 2020). Compounding these challenges is the COVID-19 pandemic. Despite the current vaccine rollout worldwide, and with some countries seeing a potential end to the health crisis, the pandemic has taken – and continues to take – its toll in many parts of the world. The unprecedented nature of COVID-19 could ultimately make it more difficult for the EU to address the impacts of climate change on fragility and security in its partner regions. In other words: How does the pandemic affect the EU’s ability to address climate-fragility risks in its neighbourhood? To answer this question, this paper will explore the implications of COVID-19 on relevant EU policies and strategies that address the climate security nexus, focusing on three regions: the Sahel, North Africa, and Western Balkans. These regions were chosen for geographical representativeness (i.e., being the EU’s southern and eastern neighbouring regions), as well as being priority regions for EU external action, and, in the case of the Western Balkans, for EU accession.1 The remainder of the paper is structured as follows: Section 2 outlines, in general terms, the impacts of the pandemic on the political priorities and ability of the EU to address climate-fragility risks. Section 3 explores, for each focus region, how the pandemic affects key objectives of EU policies aiming at reducing climate-fragility risks in that region. Section 4 provides several recommendations on how the EU can better address the interlinking risks associated with climate-fragility and COVID-19.
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Ossoff, Will, Naz Modirzadeh e Dustin Lewis. Preparing for a Twenty-Four-Month Sprint: A Primer for Prospective and New Elected Members of the United Nations Security Council. Harvard Law School Program on International Law and Armed Conflict, dicembre 2020. http://dx.doi.org/10.54813/tzle1195.
Abstract (sommario):
Under the United Nations Charter, the U.N. Security Council has several important functions and powers, not least with regard to taking binding actions to maintain international peace and security. The ten elected members have the opportunity to influence this area and others during their two-year terms on the Council. In this paper, we aim to illustrate some of these opportunities, identify potential guidance from prior elected members’ experiences, and outline the key procedures that incoming elected members should be aware of as they prepare to join the Council. In doing so, we seek in part to summarize the current state of scholarship and policy analysis in an effort to make this material more accessible to States and, particularly, to States’ legal advisers. We drafted this paper with a view towards States that have been elected and are preparing to join the Council, as well as for those States that are considering bidding for a seat on the Council. As a starting point, it may be warranted to dedicate resources for personnel at home in the capital and at the Mission in New York to become deeply familiar with the language, structure, and content of the relevant provisions of the U.N. Charter. That is because it is through those provisions that Council members engage in the diverse forms of political contestation and cooperation at the center of the Council’s work. In both the Charter itself and the Council’s practices and procedures, there are structural impediments that may hinder the influence of elected members on the Security Council. These include the permanent members’ veto power over decisions on matters not characterized as procedural and the short preparation time for newly elected members. Nevertheless, elected members have found creative ways to have an impact. Many of the Council’s “procedures” — such as the “penholder” system for drafting resolutions — are informal practices that can be navigated by resourceful and well-prepared elected members. Mechanisms through which elected members can exert influence include the following: Drafting resolutions; Drafting Presidential Statements, which might serve as a prelude to future resolutions; Drafting Notes by the President, which can be used, among other things, to change Council working methods; Chairing subsidiary bodies, such as sanctions committees; Chairing the Presidency; Introducing new substantive topics onto the Council’s agenda; and Undertaking “Arria-formula” meetings, which allow for broader participation from outside the Council. Case studies help illustrate the types and degrees of impact that elected members can have through their own initiative. Examples include the following undertakings: Canada’s emphasis in 1999–2000 on civilian protection, which led to numerous resolutions and the establishment of civilian protection as a topic on which the Council remains “seized” and continues to have regular debates; Belgium’s effort in 2007 to clarify the Council’s strategy around addressing natural resources and armed conflict, which resulted in a Presidential Statement; Australia’s efforts in 2014 resulting in the placing of the North Korean human rights situation on the Council’s agenda for the first time; and Brazil’s “Responsibility while Protecting” 2011 concept note, which helped shape debate around the Responsibility to Protect concept. Elected members have also influenced Council processes by working together in diverse coalitions. Examples include the following instances: Egypt, Japan, New Zealand, Spain, and Uruguay drafted a resolution that was adopted in 2016 on the protection of health-care workers in armed conflict; Cote d’Ivoire, Kuwait, the Netherlands, and Sweden drafted a resolution that was adopted in 2018 condemning the use of famine as an instrument of warfare; Malaysia, New Zealand, Senegal, and Venezuela tabled a 2016 resolution, which was ultimately adopted, condemning Israeli settlements in Palestinian territory; and A group of successive elected members helped reform the process around the imposition of sanctions against al-Qaeda and associated entities (later including the Islamic State of Iraq and the Levant), including by establishing an Ombudsperson. Past elected members’ experiences may offer some specific pieces of guidance for new members preparing to take their seats on the Council. For example, prospective, new, and current members might seek to take the following measures: Increase the size of and support for the staff of the Mission to the U.N., both in New York and in home capitals; Deploy high-level officials to help gain support for initiatives; Partner with members of the P5 who are the informal “penholder” on certain topics, as this may offer more opportunities to draft resolutions; Build support for initiatives from U.N. Member States that do not currently sit on the Council; and Leave enough time to see initiatives through to completion and continue to follow up after leaving the Council.