Bibliographies thématiques / Central charges

Littérature scientifique sur le sujet « Central charges »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Central charges"

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Perry, Malcolm, et Maria J. Rodriguez. « Central charges for AdS black holes ». Classical and Quantum Gravity 39, no 4 (28 janvier 2022) : 045009. http://dx.doi.org/10.1088/1361-6382/ac45d8.

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Abstract Nontrivial diffeomorphisms act on the horizon of a generic 4D black holes and create distinguishing features referred to as soft hair. Amongst these are a left–right pair of Virasoro algebras with associated charges that reproduce the Bekenstein–Hawking entropy for Kerr black holes. In this paper we show that if one adds a negative cosmological constant, there is a similar set of infinitesimal diffeomorphisms that act non-trivially on the horizon. The algebra of these diffeomorphisms gives rise to a central charge. Adding a boundary counterterm, justified to achieve integrability, leads to well-defined central charges with c L = c R. The macroscopic area law for Kerr-AdS black holes follows from the assumption of a Cardy formula governing the black hole microstates.
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GUPTA, KUMAR S., E. HARIKUMAR, SIDDHARHTA SEN et M. SIVAKUMAR. « THE CENTRAL CHARGE OF THE WARPED AdS3 BLACK HOLE ». Modern Physics Letters A 25, no 24 (10 août 2010) : 2065–70. http://dx.doi.org/10.1142/s0217732310033438.

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The AdS/CFT conjecture offers the possibility of a quantum description for a black hole in terms of a CFT. This has led to the study of general AdS3 type black holes with a view to constructing an explicit toy quantum black hole model. Such a CFT description would be characterized by its central charge and the dimensions of its primary fields. Recently, the expression for the central charges (CL, CR) of the CFT dual to the warped AdS3 have been determined using asymptotic symmetry arguments. The central charges depend, as expected, on the warping factor. We show that topological arguments, used by Witten to constrain central charges for the BTZ black hole, can be generalized to deal with the warped AdS3 case. Topology constrains the warped factor to be rational numbers while quasi-normal modes are conjectured to give the dimensions of primary fields. We find that in the limit when warping is large or when it takes special rational values, the system tends to Witten's conjectured unique CFTs with central charges that are multiples of 24.
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FREEMAN, M. D., K. HORNFECK et P. WEST. « COMMUTING QUANTITIES AND EXCEPTIONAL W ALGEBRAS ». International Journal of Modern Physics A 08, no 05 (20 février 1993) : 909–28. http://dx.doi.org/10.1142/s0217751x93000357.

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Sets of commuting charges constructed from the current of a U(1) Kac-Moody algebra are found. There exists a set Sn of such charges for each positive integer n>1; the corresponding value of the central charge in the Feigin-Fuchs realization of the stress tensor is c=13−6n−6/n. The charges in each series can be written in terms of the generators of an exceptional W algebra.
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Manzoni, Federico. « 2-simplexes and superconformal central charges ». Physics Letters B 832 (septembre 2022) : 137268. http://dx.doi.org/10.1016/j.physletb.2022.137268.

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Ng, Siu-Hung, Eric C. Rowell, Yilong Wang et Qing Zhang. « Higher central charges and Witt groups ». Advances in Mathematics 404 (août 2022) : 108388. http://dx.doi.org/10.1016/j.aim.2022.108388.

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FEDORUK, S., et V. G. ZIMA. « MASSIVE SUPERPARTICLE WITH TENSORIAL CENTRAL CHARGES ». Modern Physics Letters A 15, no 37 (7 décembre 2000) : 2281–96. http://dx.doi.org/10.1142/s0217732300002875.

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We construct the manifestly Lorenz-invariant formulation of the N = 1, D=4 massive superparticle with tensorial central charges. The model contains a real parameter k and at k≠0 possesses one κ-symmetry while at k=0 the number of κ-symmetry is two. The equivalence of the formulations at all k≠0 is obtained. The local transformations of κ-symmetry are written. It is considered using the index spinor for construction of the tensorial central charges. The equivalence at classical level between the massive D=4 superparticle with one κ-symmetry and the massive D=4 spinning particle is obtained.
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West, Peter. « Brane dynamics, central charges and E11 ». Journal of High Energy Physics 2005, no 03 (21 avril 2005) : 077. http://dx.doi.org/10.1088/1126-6708/2005/03/077.

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West, Peter. « E11, SL(32) and central charges ». Physics Letters B 575, no 3-4 (novembre 2003) : 333–42. http://dx.doi.org/10.1016/j.physletb.2003.09.059.

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Gracey, J. A. « On topological central charges and solitons ». Physics Letters B 185, no 1-2 (février 1987) : 104–6. http://dx.doi.org/10.1016/0370-2693(87)91536-x.

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Fendley, Paul, et Ken Intriligator. « Central charges without finite-size effects ». Physics Letters B 319, no 1-3 (décembre 1993) : 132–38. http://dx.doi.org/10.1016/0370-2693(93)90792-g.

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Thèses sur le sujet "Central charges"

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Zhang, Wei. « Rational vertex operator algebras with small central charges and generators / ». Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.

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Fonda, Piermarco. « Aspects of holographic entanglement entropy : shape dependence and hyperscaling violating backgrounds ». Doctoral thesis, SISSA, 2015. http://hdl.handle.net/20.500.11767/4860.

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This thesis collects three works about holographic computations of entanglement entropy. In the first one it is shown how to compute numerically, following the Ryu-Takayanagi prescription, the entanglement entropy for arbitrarily shaped entangling regions in three dimensional conformal field theories. The other two focus on holographic theories with hyperscaling violating exponents: the time dependence after a holographic quench is analyzed and the arising of new universal terms due to the presence of non smooth boundaries is shown.
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Cussans, David George. « The optimization of the FADC readout system for the Zeus central tracking detector ». Thesis, University of Bristol, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335649.

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Jésus, Pierre. « Impact de l’état et de la prise en charge nutritionnels dans les maladies neurodégénératives : Approche neuroépidémiologique ». Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0071/document.

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Les maladies neurodégénératives (MND) comprennent principalement les maladies neuromusculaires, dont la sclérose latérale amyotrophique (SLA), les démences, dont la maladie d’Alzheimer, la maladie de Parkinson, la sclérose en plaques, la maladie de Huntington. Du fait de la multiplicité des facteurs à l’origine d’une perte pondérale, les MND sont à risque de dénutrition, ce qui peut altérer l’évolution de ces pathologies et la qualité de vie des patients. Le but de ce travail était d’étudier le statut nutritionnel et/ou l’effet de la prise en charge de patients atteints de SLA et de troubles cognitifs (démence vraie et/ou Mild Cognitive Impairment [MCI]) en France dans le cadre d’un réseau de santé, mais aussi en Afrique Centrale. Le réseau de santé Limousin Nutrition (LINUT) réalise des évaluations et interventions nutritionnelles au domicile de patients atteints de SLA et pour les résidents d’Etablissements d’Hébergement pour Personnes Agées Dépendantes (EHPAD). La première évaluation par le réseau des patients à domicile atteints de SLA retrouvait plus de troubles de la déglutition qu’en consultation spécialisée (60,0% vs 47,5%) ainsi que des troubles du goût (43,8%), non encore décrits lors de la SLA. Des améliorations de pratiques étaient proposées. Le réseau évaluait également des résidents en EHPAD, déments ou non déments, à la fois initialement et après un suivi d’environ 4 mois. La dénutrition touchait plus souvent les patients déments (56,1% vs 46,4% p=0,004), et les apports énergétiques de tous les résidents (26,4 ± 8,8 kcal/kg/j) étaient inférieurs aux recommandations. L’intervention du réseau permettait d’améliorer le statut nutritionnel des patients déments (+0,29 ± 0,07 point de MNA®/mois, p=0,003) ainsi que les apports énergétiques de tous les résidents à 4 mois. Les études « Epidémiologie de la Démence en Afrique Centrale » (EDAC) et « Epidemiology of Dementia in Central Africa » (EPIDEMCA) étaient menées en République Centrafricaine (RCA) et au Congo. Dans ces deux études, les personnes âgées démentes étaient plus souvent dénutries que les non démentes (EDAC : 34,7% vs 17,7%, p<0,0001 ; EPIDEMCA : 60,0% vs 31,3%, p<0,001). Dans l’étude EDAC, le fait de ne consommer qu’un repas par jour constituait un risque de dénutrition chez les déments (OR=7,23 [IC95% : 1,65-31,7, p=0,003]. De plus, les déments consommaient moins de fruits que les non déments (aucune consommation : 54,0% vs 36,7%, p=0,008). Dans l’étude EPIDEMCA, en RCA, une faible consommation d’oléagineux en zone rurale était associée à la présence d’une démence (OR=2,80 [IC95% : 1,02-7,70, p=0,046]), et une consommation d’alcool (quantités non étudiées) en population générale était négativement associée (OR=0,34 [IC95% : 0,14-0,83, p=0,018]). Aucune association n’était retrouvée au Congo. Des facteurs nutritionnels associés aux troubles cognitifs étaient identifiés : un Indice de Masse Corporelle <18,5kg/m2 , un périmètre brachial <24cm et une circonférence musculaire brachiale <5èmepercentile étaient associés en RCA à la démence (OR=2,66 [IC95% : 1,39-5,07, p=0,003] ; OR=1,97 [IC95% : 1,03-3,77, p=0,041] ; OR=2,94 [IC95% : 1,34-6,45, p=0,007], respectivement), et au Congo seule la circonférence musculaire brachiale <5èmepercentile était associée aux MCI (OR=3,61 [IC95% : 1,70-7,64, p=0,001]). Ces différents travaux permettent de disposer de nouvelles données concernant les patients atteints de SLA et de troubles cognitifs dans deux régions du globe. En France, une prise en charge par un réseau de santé est possible et semble améliorer le statut nutritionnel des personnes atteintes de MND. En Afrique Centrale, plusieurs facteurs associés aux troubles cognitifs ont été identifiés. Ces premiers résultats doivent être confirmés afin de proposer des moyens de prévention ciblés
Neurodegenerative diseases (NDD) mainly concern neuromuscular diseases, including amyotrophic lateral sclerosis (ALS), dementia, including Alzheimer's disease, Parkinson's disease, multiple sclerosis, Huntington's disease. Due to the multiplicity of factors inducing a weight loss, the NDD are at risk of malnutrition, which can alter the evolution of these diseases and the quality of life of patients. The purpose of this work was to assess the nutritional status and / or the effect of treatment of patients with ALS and cognitive disorders (dementia and / or mild cognitive impairment [MCI]) in France with a health network, but also in Central Africa. The health network Limousin Nutrition (LINUT) realizes assessments and nutritional interventions in ALS patients at home and in residents of nursing homes (NH). The first evaluation by the network of ALS patients found more swallowing disorders than specialized consultation (60.0% vs. 47.5%) and taste disorders (43.8%), not further described in ALS. Improvements of practices were proposed. The network assessed also residents in NH, with or without dementia, initially and after a 4 months follow-up. Malnutrition affected more often demented patients (56.1% vs. 46.4% p=0.004), and energy intakes of all residents (26.4 ± 8.8 kcal/kg/d) were below the recommendations. The network intervention improved the nutritional status of patients with dementia (+0.29 ± 0.07 point of MNA®/month, p=0.003) and energy intake of all residents at 4 months. Two studies named
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Cohen, Salomon Yves. « Adaptation au scotome central ». Paris 6, 2003. http://www.theses.fr/2003PA066063.

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Mayol, Séverine. « Devenir un bon pauvre : Analyse genrée de la prise en charge des personnes sans domicile ». Thesis, Paris 5, 2012. http://www.theses.fr/2012PA05H015.

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Yeh, Hung-Yu [Verfasser]. « Period, Central Charge and Effective Action on Ricci-Flat Manifolds with Special Holonomy / Hung-Yu Yeh ». Bonn : Universitäts- und Landesbibliothek Bonn, 2017. http://d-nb.info/1139048961/34.

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Mohamed, Samantha Ann. « The feasibility of a congestion charge for Cape Town central business district from a traffic engineering perspective ». Thesis, Cape Peninsula University of Technology, 2008. http://hdl.handle.net/20.500.11838/1036.

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Thesis (MTech (Civil Engineering))--Cape Peninsula University of Technology, 2008.
There is an ever increasing need to introduce travel demand measures as the ability to construct new and upgrade existing roads to accommodate additional traffic volumes decreases. The City of Cape Town, hereinafter referred to as the City, has forecasted that traffic in the city could continue to increase by two and a half percent per year. To mitigate against the increased traffic volumes, the City is proposing a number of travel demand strategies, including a park and-ride facilities and high occupancy vehicle initiatives in the short term. The City’s draft travel demand management strategy identifies congestion charging as a measure more possible implementation in the medium term. This study investigates the feasibility of introducing a congestion charge from a traffic engineering perspective. This entails determining if there could be a reduction in traffic entering the Central Business District, what type of congestion charge is most suited for Cape Town and what type of technology is most appropriate at this point in time. In determining the type of charge and technology for introduction in Cape Town, international experience and trials were drawn upon in terms of case studies and research completed. These included developed and developing cities that had either introduced a congestion charge or considered it. To determine the potential level of traffic reduction, transportation elasticities for road pricing/congestion charging were used. This method of calculating the traffic reduction has been used on similar studies and provides a reasonable indication of the potential percentage reduction which could be achieved. The elasticities were based on post-implementation studies undertaken in cities which had introduced a congestion charge or road user pricing. For this study, elasticities between -0.1 and -0.5 were used. The study found that of the types of congestion charging available, a simple cordon charge, around the central business district (CBD) was most feasible. A cordon area would be more appropriate due to the small charge area involved, the flexibility that it allows and because it does not need to be visually intrusive in terms of roadside and enforcement equipment. The location of the cordon area also allows the key roads around the CBD to become the bypass route for vehicles that currently pass through the area. In terms of the charge payment system, it was found that presently, a manual payment system would be more appropriate for the city than a tag and beacon system.
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Mohamed, Samatha Ann. « The feasibility of a congestion charge for Cape Town central business district from a traffic engineering perspective / ». [S.l. : s.n.], 2008. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1068&context=td_cput.

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Kiss, Gábor Annamária. « Formulation géométrique des théories de supergravité N=4 et N=8 en superespace avec charges centrales ». Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX22095.

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Livres sur le sujet "Central charges"

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J, MacEachin Douglas. CIA assessments of the Soviet Union : The record versus the charges : an intelligence monograph. [Langley, Va?] : Center for the Study of Intelligence, 1996.

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Bordo, Michael D. Charles Goodhart's contributions to the history of monetary institutions. Cambridge, MA : National Bureau of Economic Research, 2002.

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Lockhart, James. Charles Gibson and the ethnohistory of postconquest Central Mexico. [Bundoora, Australia] : La Trobe University, Institute of Latin American Studies, 1988.

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Jawa Tengah (Indonesia). Badan Perencanaan Pembangunan Daerah., dir. Jawa Tengah membangun = : Central Java develops, 1979-1983. [Semarang] : Pemerintah Propinsi Daerah Tingkat I Jawa Tengah, Badan Perencanaan Pembangunan Daerah, 1985.

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W, Ladd John, Buffler Richard T, Ocean Margin Drilling Program et Marine Science International, dir. Middle America trench off Western Central America. Woods Hole, MA : Marine Science International, 1985.

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1946-, Davis Richard Clarke, et Hakluyt Society, dir. The central Australian expedition, 1844-1846 : The journals of Charles Sturt. London : Hakluyt Society, 2002.

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Eash, David A. Flood of June 4-5, 2002, in the Maquoketa River basin, East-Central Iowa. Reston, Va : U.S. Geological Survey, 2004.

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Péguy, Centre Charles. Les manuscrits de Charles Péguy. Ville d'Orléans [France] : Centre Charles Péguy, 1987.

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honoree, Kolb Charles C., dir. Social dynamics of ceramic analysis : New techniques and interpretations : papers in honour of Charles C. Kolb. Oxford, England : Archaeopress, 2014.

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Broun, Dauvit. The charters of Gaelic Scotland and Ireland in the early and central Middle Ages. Cambridge [England] : Dept. of Anglo-Saxon, Norse and Celtic, University of Cambridge, 1995.

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Chapitres de livres sur le sujet "Central charges"

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Lopuszanski, Jan. « The Story of Central Charges ». Dans Concise Encyclopedia of Supersymmetry, 20–21. Dordrecht : Springer Netherlands, 2004. http://dx.doi.org/10.1007/1-4020-4522-0_8.

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Semikhatov, A. M. « Virasoro Central Charges for Nichols Algebras ». Dans Mathematical Lectures from Peking University, 67–92. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-39383-9_3.

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Fedoruk, S., et V. G. Zima. « Massive Superparticle with Spinorial Central Charges ». Dans Noncommutative Structures in Mathematics and Physics, 161–80. Dordrecht : Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0836-5_13.

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Connes, Alain, Bernard de Wit, Antoine Van Proeyen, Sergey Gukov, Rafael Hernandez, Pablo Mora, Anatoli Klimyk et al. « Central Charge ». Dans Concise Encyclopedia of Supersymmetry, 85. Dordrecht : Springer Netherlands, 2004. http://dx.doi.org/10.1007/1-4020-4522-0_99.

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Kropej, Monika. « Slovenian Charms Between South Slavic and Central European Tradition ». Dans Charms, Charmers and Charming, 145–62. London : Palgrave Macmillan UK, 2009. http://dx.doi.org/10.1057/9780230583535_11.

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Rangamani, Mukund, et Tadashi Takayanagi. « Entanglement at Large Central Charge ». Dans Holographic Entanglement Entropy, 171–83. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52573-0_12.

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Metral, E., G. Rumolo et W. Herr. « Impedance and Collective Effects ». Dans Particle Physics Reference Library, 105–81. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34245-6_4.

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AbstractAs the beam intensity increases, the beam can no longer be considered as a collection of non-interacting single particles: in addition to the “single-particle phenomena”, “collective effects” become significant. At low intensity a beam of charged particles moves around an accelerator under the Lorentz force produced by the “external” electromagnetic fields (from the guiding and focusing magnets, RF cavities, etc.). However, the charged particles also interact with themselves (leading to space charge effects) and with their environment, inducing charges and currents in the surrounding structures, which create electromagnetic fields called wake fields. In the ultra-relativistic limit, causality dictates that there can be no electromagnetic field in front of the beam, which explains the term “wake”. It is often useful to examine the frequency content of the wake field (a time domain quantity) by performing a Fourier transformation on it. This leads to the concept of impedance (a frequency domain quantity), which is a complex function of frequency. The charged particles can also interact with other charged particles present in the accelerator (leading to two-stream effects, and in particular to electron cloud effects in positron/hadron machines) and with the counter-rotating beam in a collider (leading to beam–beam effects). As the beam intensity increases, all these “perturbations” should be properly quantified and the motion of the charged particles will eventually still be governed by the Lorentz force but using the total electromagnetic fields, which are the sum of the external and perturbation fields. Note that in some cases a perturbative treatment is not sufficient and the problem has to be solved self consistently. These perturbations can lead to both incoherent (i.e. of a single particle) and coherent (i.e. of the centre of mass) effects, in the longitudinal and in one or both transverse directions, leading to beam quality degradation or even partial or total beam losses. Fortunately, stabilising mechanisms exist, such as Landau damping, electronic feedback systems and linear coupling between the transverse planes (as in the case of a transverse coherent instability, one plane is usually more critical than the other).
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Jacqmarcq, O. « Prise en charge d’un cathéter central ». Dans Prise en charge médicale et diététique des maladies héréditaires du métabolisme, 479–82. Paris : Springer Paris, 2013. http://dx.doi.org/10.1007/978-2-8178-0046-2_41.

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Smaghi, Lorenzo Bini, et Daniel Gros. « Who is in charge of the Eurosystem ? » Dans Open Issues in European Central Banking, 5–28. London : Palgrave Macmillan UK, 2000. http://dx.doi.org/10.1057/9780333981887_2.

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D’Ambrosio, C., P. Destruel, U. Gensch, H. Güsten, H. Leutz, D. Puertolas, S. Schlenstedt et al. « Scintillating Fibres for Central Tracking of Charged Particles ». Dans New Technologies for Supercolliders, 173–84. Boston, MA : Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-1360-1_13.

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Actes de conférences sur le sujet "Central charges"

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SON, EDWIN J., et WONTAE KIM. « CENTRAL CHARGES IN 2D REDUCED COSMOLOGICAL MASSIVE GRAVITY ». Dans Proceedings of the MG12 Meeting on General Relativity. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814374552_0390.

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Jackson, Alicia R., Tai-Yi Yuan, Chun-Yuh Huang et Wei Yong Gu. « A Two-Point Conductivity Approach to Measuring Fixed Charge Density in Intervertebral Disc Tissue ». Dans ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206310.

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Low back pain, a major socio-economic concern in the United States, is believed to result from degeneration of the intervertebral disc (IVD) of the spine [1]. The IVD is characterized as a charged, hydrated soft tissue made up of a central nucleus pulposus (NP) surrounded by the layered annulus fibrosus (AF). The negatively-charged nature of the disc derives from the charged groups attached to the glycosaminoglycan (GAG) molecules found on proteoglycans (PG) in the extracellular matrix of the disc. The fixed charge density (FCD) is a measure of the number of negative charges attached to the disc matrix per unit volume. FCD is important to disc function, both mechanically (i.e., swelling pressure) and in terms of transport through the disc [2].
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FEDORUK, S., et V. G. ZIMA. « SUPERPARTICLE WITH TENSORIAL CENTRAL CHARGES PRESERVED ANY NUMBER OF SUPERSYMMETRIES ». Dans Proceedings of the IX International Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812778192_0072.

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LI, WEI-BING, JIA-XIN YU, FENG HAO, JIAN-JUN ZHU et XIAO-WEN HONG. « EFFECTS OF STRUCTURAL PARAMETERS ON THE SHOCK WAVE OVERPRESSURE CHARACTERISTICS OF A MULTILAYER COMPOSITE CHARGE ». Dans 32ND INTERNATIONAL SYMPOSIUM ON BALLISTICS. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/ballistics22/36072.

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This work examined a multilayer composite charge composed of an internal explosive charge, an intermediate non-explosive material and an outer aluminized explosive arranged in a coaxial structure. Using numerical simulations, a back propagation (BP) neural network algorithm and experimental verification, the shock wave overpressure characteristics of multilayer composite charges s having various structural parameters and initiation modes were examined. The ratio of the shock wave overpressure increase from simultaneous initiation of the internal and external charges to that generated by initiation of the central single charge was used to assess the effects of the structural parameters, overpressure increase ratio and suitable ranges for these parameters were generated. The structure of the composite charge was then optimized based on BP neural network calculations. The reliability of the numerical simulation method was verified by actual static explosion tests of warheads.
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Andrianopoli, Laura, Riccardo D'Auria et Sergio Ferrara. « Flat Symplectic Bundles of N-Extended Supergravities, Central Charges and Black-Hole Entropy ». Dans Proceedings of the APCTP Winter School. WORLD SCIENTIFIC, 1998. http://dx.doi.org/10.1142/9789814447287_0007.

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Ahmad Kamaruddin, Saadi Bin, Nor Azura Md Ghani et Norazan Mohamed Ramli. « Determining the best forecasting method to estimate unitary charges price indexes of PFI data in central region Peninsular Malaysia ». Dans PROCEEDINGS OF THE 20TH NATIONAL SYMPOSIUM ON MATHEMATICAL SCIENCES : Research in Mathematical Sciences : A Catalyst for Creativity and Innovation. AIP, 2013. http://dx.doi.org/10.1063/1.4801271.

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He, Xingxi, et Donald J. Leo. « Monte-Carlo Simulation of Ion Transport at the Polymer-Metal Interface ». Dans ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79765.

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The transport of charge due to electric stimulus is the primary mechanism of actuation for a class of polymeric active materials known as ionomeric polymer transducers. Continuum-based models of ion transport have been developed for the purpose of understanding charge transport due to diffusion and migration. In this work a two dimensional ion hopping model has been built to describe ion transport in ionomeric polymer transducer (IPT) with Monte-Carlo simulation. In the simulation, cations are distributed on 50nm × 50nm × 1nm (or 50nm × 10 nm × 1nm) lattice cells of IPT while the same number of negative charges are uniformly scattered and fixed as background. In the simulation, thermally activated cations are hopping between multiwell energy structures by overcoming energy barriers around with a hopping distance of 1nm during each time step. A step voltage is applied between the electrodes of the IPT. In one single simulation step, coulomb energy, external electric potential energy and intrinsic energy of the material are calculated and added up for the energy wells around the cations. And then hopping rates in every potential hopping direction are obtained. Due to the random nature of the ion transitions, a weighting function from Monte-Carlo algorithm is added in to calculate the ion hopping time. Finally hopping time is compared, the minimum hopping time is chosen and one hopping event is completed. Both system time and ions distribution are updated before the next simulation loop. Periodic boundary conditions are applied when ions hop in the direction perpendicular to the electric field. The influence of the electrodes on both faces of IPT is presented by the method of image charges. The charge density at equilibrium state is compared with the result from a continuum-based model. The property of charge density has charge neutrality over the central part of the membrane and the charge imbalance over boundary layers close to the anode and cathode. Electric field distribution is obtained after charge distribution. After it is demonstrated that ion hopping model leads to the results qualitatively matching the property of IPT, the paper uses the model to analyze the polymer-metal interface when the electrode shape inside transducer varies.
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Yokoyama, Ryohei, et Koichi Ito. « Analysis of Cooperation Between Central Power Utility and Dispersed Cogeneration Systems Through Time-of-Use Pricing ». Dans ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-199.

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Because of an increase in peak electricity demand during summer daytime, a decrease in the annual load factor of power generation facilities has been one of the serious problems for central power utility systems. On the other hand, utility-connected dispersed cogeneration systems have been increasingly installed for energy supply in industrial and commercial sectors. This paper analyzes the cooperative relationship between power utility and cogeneration systems through time-of-use pricing. A game-theory approach in mathematical programming, i.e., bilevel programming, is applied to attain this objective. At the upper level, a power utility system determines the time-of-use rates for demand and energy charges of electricity purchased by a cogeneration system to maximize its load factor, and at the lower level, a cogeneration system determines its design and operation to minimize its annual total cost. Through a basic case study, it has been shown how the time-of-use rates are determined to attain the cooperative relationship between power utility and cogeneration systems.
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Lesche, B., F. C. Garcia, E. N. Hering, L. C. G. Valente, W. Margulis, I. C. S. Carvalho, A. Asseh et F. Laurell. « Etching Studies of Frequency Doubling Glass Systems ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.ctuc2.

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It is possible to induce second order nonlinear effects in glass systems, such as fibres, films or bulk silica samples by recording a permanent electric field optically, or by poling the samples with high voltages and heat. Characterising the charge distribution is central to understanding the mechanisms involved. We recently imaged frequency doubling gratings in fibres previously prepared for SHG, by etched the fibres until close to the core. Due to the presence of charges, etching is nonuniform, and the period of the grating can be unambiguously identified. Here, we present a simple technique to determine the charge distribution in poled glasses with submicron resolution. An interference pattern was formed by the reflections of a HeNe beam on the faces of a 1 mm thick poled slice of SiO2(3 KV, 280 °C). One of the faces was etched in HF, while the other was used as a reference, and the intensity of one fringe was monitored in real time. The optical path of the light reflected off the surface being etched was altered. When the glass was not poled, the etching rate was constant and a periodic variation of the fringe intensity was seen. When the glass was poled, a strong frequency modulation was observed. Positive charge resulted in slower etching, and negative charge caused faster etching [1].
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Hurajt, Marek, et Alena Novák Sedláčková. « Approach to economic regulation of airports in europe ». Dans Práce a štúdie. University of Zilina, 2021. http://dx.doi.org/10.26552/pas.z.2021.2.12.

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This paper focuses on the economic regulation of airports in Central Europe and in the world, but also focuses in detail on the method of implementing economic regulation in the Slovak Republic, which results from the transposition of Directive 2009/12/EC of the European Parliament and of the Council on airport charges. The introductory part of the paper explains in detail the theory needed for a comprehensive understanding of this task, such as the basic characteristics of the airport and the economics of airports. Due to need for a comprehensive solution to the topic, the airport was examined from an operational point of view, and for the purpose of determining the scope of regulation, the paper also focuses on the characteristics of aviation and non-aviation activities. Paper characterizes the various approaches to economic regulation of airports in selected countries of the world and the countries of Central Europe, where we focused on the forms and scope of regulation, as well as in the case of EU Member States on the implementation of Directive 2009/12/EC of the European Parliament and of the Council on airport charges into national legislation. The most important part of the work a comprehensive summary of the approach to the economic regulation of airports in the Slovak Republic from its onset to the present with an indication of the legislation that regulates it. At the same time, the paper points out possible options of changes in the set system, which are benefits of the paper. Paper uses research methods such as analysis, comparison, and abstraction, as well as graphs, figures, and tables, which facilitate the understanding of the task and the researched issue.
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Rapports d'organisations sur le sujet "Central charges"

1

Byon, Aesook. Central Production of Charged Particles at CDF. Office of Scientific and Technical Information (OSTI), décembre 1989. http://dx.doi.org/10.2172/1427785.

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Gil Montero, Raquel. Esclavitud, servidumbre y libertad en Charcas. Maria Sibylla Merian Centre Conviviality-Inequality in Latin America, novembre 2020. http://dx.doi.org/10.46877/gilmontero.2020.28.

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Este working paper propone analizar el trabajo coactivo y la servidumbre en los Andes coloniales a partir de la reconstrucción de la convivencia en las haciendas con mano de obra de diferente origen. En particular se centra en los reclamos de personas que siendo legalmente libres se consideraban esclavizadas y/o eran consideradas así por testigos de su situación. El texto se inscribe en una sociedad que por definición era desigual, la de Charcas, y estaba obsesionada por la clasificación de las personas, ya que así se definían las condiciones sociales a las que se les reconocían privilegios, derechos y obligaciones. Las categorizaciones y sus definiciones son, por ello, uno de los ejes del trabajo, en especial la del yanaconazgo. Aunque la experiencia cotidiana de los yanaconas fue muy semejante a la de los esclavizados, el trabajo busca distinguirlos y recuperar el uso específico que hicieron los querellantes de los diferentes términos.
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Saleem, Raja M. Ali, Ihsan Yilmaz et Priya Chacko. Civilizationist Populism in South Asia : Turning India Saffron. European Center for Populism Studies (ECPS), février 2022. http://dx.doi.org/10.55271/pp0009.

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The 21st century has witnessed a significant shift in how the concept of nationalism is understood. A political marriage between identity politics and populism has resulted in “civilizationism,” a new form of nationalism that entails an emotionally charged division of society into “the people” versus “the Other.” All too often, the divisive discourses and policies associated with civilizationalist populism produce intercommunal conflict and violence. This paper draws on a salient case study, India’s Hindutva movement, to analyze how mainstream populist political parties and grassroots organizations can leverage civilizationist populism in campaigns to mobilize political constituencies. In surveying the various groups within the Hindutva movement and conducting a discourse analysis of their leaders’ statements, the paper shows the central role of sacralized nostalgia, history, and culture in Hindutva populist civilizationism. By analyzing the contours and socio-political implications of civilizationist populism through this case study, the paper contributes to the theoretical understanding of the concept more generally.
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Lenahan, Jack. The Data Warehouse in Service Oriented Architectures and Network Centric Warfare (Briefing Charts). Fort Belvoir, VA : Defense Technical Information Center, juin 2004. http://dx.doi.org/10.21236/ada464283.

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Clough, J. G., R. R. Reifenstuhl, C. G. Mull, D. S. Pinney, G. M. Laird et S. A. Liss. Geologic map of the Charley River D-1, C-1, and part of the B-1 quadrangles, east-central Alaska. Alaska Division of Geological & Geophysical Surveys, 1995. http://dx.doi.org/10.14509/1712.

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Pinney, D. S., J. G. Clough et S. A. Liss. Surficial geologic map of the Charley River D-1, C-1, and part of the B-1 quadrangles, east-central Alaska. Alaska Division of Geological & Geophysical Surveys, 1995. http://dx.doi.org/10.14509/1714.

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Pinney, D. S., J. G. Clough, R. R. Reifenstuhl et S. A. Liss. Geologic hazards map of the Charley River D-1, C-1, and part of the B-1 quadrangles, east-central Alaska. Alaska Division of Geological & Geophysical Surveys, 1995. http://dx.doi.org/10.14509/1716.

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Clough, J. G., M. S. Robinson, K. H. Clautice et R. B. Blodgett. Evaluation unit 35 - Charley River and Black River quadrangles, east-central Alaska : General geology and geochemical, major oxide, and lead isotope data. Alaska Division of Geological & Geophysical Surveys, 1993. http://dx.doi.org/10.14509/1570.

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Clough, J. G., C. G. Mull, R. R. Reifenstuhl, S. A. Liss, G. M. Laird et D. S. Pinney. Interpretive bedrock geologic map of the Charley River D-1, C-1, and part of the B-1 quadrangles, east-central Alaska. Alaska Division of Geological & Geophysical Surveys, 1995. http://dx.doi.org/10.14509/1713.

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Pinney, D. S., J. G. Clough, R. R. Reifenstuhl et S. A. Liss. Derivative geologic materials map of the Charley River D-1, C-1, and part of the B-1 quadrangles, east-central Alaska. Alaska Division of Geological & Geophysical Surveys, 1995. http://dx.doi.org/10.14509/1715.

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