WorldWideScience

Sample records for nucleaires principes enjeux

  1. The French civilian nuclear: connections and stakes; Le nucleaire civil francais: filieres et enjeux

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-07-01

    This document (18 power point slides) gives an overview of the French civilian nuclear industry and research and development: importance of the nuclear power generation in France, excellence of the education in nuclear sciences, organization of the nuclear connection (CEA, Areva, EDF, IRSN), the role of the French International Nuclear Agency (AFNI), the requirements for a renewal of human resources (French and foreign engineers) in the field of nuclear energy, the degree course for a diploma, examples of engineer and university diplomas, the educational networks in various regions of France, presentation of the Institut National des Sciences et Techniques Nucleaires (Nuclear Sciences and Techniques National Institute) and its master degrees, organization of the French education system in nuclear sciences with strong relations with the research and development programs

  2. Inspection of nuclear pressure equipment: principles, issues and perspectives; Le controle des equipements sous pression nucleaires: principes, enjeux et perspectives

    Energy Technology Data Exchange (ETDEWEB)

    Limousin, S. [Autorite de Surete Nucleaire (ASN), Dir. des Equipements sous Pression Nucleaires, 75 - Paris (France)

    2010-02-15

    French regulations about nuclear pressure equipment (like steam generators and the reactor pressure vessel) take into account hazards due to the energy contained in the equipment but also add specific requirements due for instance to the radioactivity or safety for instance. ASN is in charge of the conformity assessment of the most important equipment and monitors the licensee who is responsible of in service inspection and maintenance. Because of the internationalization of nuclear component manufacturing, and consequently new comers in this area, a careful monitoring of subcontractors is needed. The major anomalies detected in steam generator over the past few years showed the necessity of being careful and humble towards degradation mechanisms. Nuclear pressure equipment regulations enables ASN to perform an efficient oversight of licensees and component manufacturer in a context of international manufacturing and licence renewal. (author)

  3. Is it possible to recycle nuclear wastes? Costs, risks and stakes of the plutonium industry; Peut-on recycler les dechets nucleaires? Couts, risques et enjeux de l'industrie du plutonium

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2009-07-01

    This document, published by the French association 'Sortir du nucleaire' (Get out of nuclear), gives some information on the chain reaction from uranium to plutonium, the difference between reprocessing (which does not reduce waste volumes but multiply waste types) and recycling, the high risks associated with plutonium transport, La Hague as the most dangerous nuclear site in France, reprocessing as the alibi for the French nuclear industry, Areva as an expert in propaganda, reprocessing as an absurd world strategy, plutonium as a fuel for proliferation, the myth of unlimited energy with the breeder reactors, and so on

  4. Les enjeux du développement des énergies renouvelables : Les enjeux territoriaux

    OpenAIRE

    Fournier, Mauricette; Grison, Jean-Baptiste; Rieutort, Laurent

    2012-01-01

    L'approche spatiale des enjeux du développement des énergies renouvelables permet de rappeler que les géographes s'intéressent aux questions énergétiques comme clé de lecture des territoires. À l'échelle mondiale, même si la part de consommation énergétique provenant des sources d'énergie renouvelables reste faible (8 %), la production connaît une croissance sensible, y compris dans certains pays émergents, laissant augurer un début de transition énergétique. Les cartes de distribution de la ...

  5. La Spectroscopie laser appliquee a la physique nucleaire

    CERN Document Server

    Le Blanc, F

    2001-01-01

    l'etude de la forme du noyau atomique est un sujet fondamental puisqu'elle constitue un excellent laboratoire pour tester et valider les differents modeles nucleaires.La spectroscopie atomique et plus particulierement la spectroscopie laser est un moyen precis et inhabituel pour caracteriser des observables liees a la forme du noyau.

  6. Siloette, Siloe mock-up; Siloette, modele nucleaire de siloe

    Energy Technology Data Exchange (ETDEWEB)

    Delcroix, V.; Jeanne, G.; Mitault, G.; Schulhof, P. [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1964-07-01

    Siloette is the Siloe mock-up. The main installations are described: various tanks, building, auxiliaries, control systems... Precis ions are given about precautions taken for using spent fuel elements. (authors) [French] Siloette est le modele nucleaire de SILOE. On decrit ses diverses installations: bassins, batiments, auxiliaires, controle... Des precisions sont donnees sur les precautions prises pour y utiliser des elements uses. (auteurs)

  7. Enjeux et spécificités de la recherche en santé animale

    OpenAIRE

    Ducrot, Christian; Bed'Hom, Bertrand; Beringue, Vincent; Coulon, Jean Baptiste; Fourichon, Christine; Guérin, Jean-Luc; Krebs, Stéphane; Rainard, Pascal; Sarradin, Pierre; Schwartz, Isabelle; Torny, Didier; Vayssier-Taussat, Muriel; Zientara, Stephan; Zundel, Etienne

    2010-01-01

    Dans le contexte très évolutif de la recherche en santé animale, une réflexion sur ses enjeux, ses spécificités et ses synergies avec la recherche biomédicale, a été conduite à l’initiative de l’INRA. Affirmés au premier chef par l’OMS, la FAO et l’OIE, les enjeux en santé animale, hors des maladies transmissibles à l’Homme, sont énormes et touchent à la sécurité alimentaire, l’économie de l’agriculture et l’ensemble des activités économiques qui en découlent. S’y ajoutent les enjeux de santé...

  8. Principal Ports

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Principal Ports are defined by port limits or US Army Corps of Engineers (USACE) projects, these exclude non-USACE projects not authorized for publication. The...

  9. Enjeux socio-economiquesde l'immigration des nigeriens dans la ...

    African Journals Online (AJOL)

    Mots clés: immigration, enjeux, développement, Migration, conséquences. English Title: Socio-economic challenges of Nigerian immigration in the community of Malanville northern Benin. English Abstract. The present work is achieved on the stakes socioeconomic of the immigration of the migrations in the township of ...

  10. Symposium sur les enjeux de la mise en oeuvre des régimes de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Symposium sur les enjeux de la mise en oeuvre des régimes de concurrence et de réglementation du marché dans les pays en développement ... Afin de combler ce besoin, ce projet vise à lancer des recherches et à faciliter le débat public sur la mise en oeuvre des régimes de réglementation dans les pays en ...

  11. Libéralisation du commerce des biens et services TIC : enjeux et ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Libéralisation du commerce des biens et services TIC : enjeux et implications pour la mise en oeuvre de politiques publiques en Afrique de l'Ouest. En Afrique de l'Ouest, les entreprises du secteur privé des technologies d'information et de la communication (TIC) ont démontré leur capacité à créer des emplois et à stimuler ...

  12. Donner un sens au nom du festival de la ville Les enjeux de la ...

    African Journals Online (AJOL)

    L'objet de ce papier est d'analyser, à partir de l'observation d'un festival local, les enjeux multiples de la reconstruction des liens d'appartenance pour des populations rurales, qui se trouvent engagées - du fait de leur urbanisation récente- dans un processus de réorganisation et de renégociation de ces liens et des ...

  13. Enjeux environnementaux du développement des biocarburants liquides pour le transport

    OpenAIRE

    Benoist, Anthony; Van de Steene, Laurent; Broust, François; Helias, Arnaud

    2012-01-01

    L'évaluation de l'impact environnemental des biocarburants a été et est encore un sujet très controversé. À partir d'une synthèse bibliographique, cet article nous présente les éléments connus et les principales incertitudes concernant les enjeux environnementaux représentés par chaque génération de biocarburants. (Résumé d'auteur)

  14. French regulations in the nuclear field and standards related to nuclear pressure equipment; Reglementation francaise dans le domaine nucleaire et normes relatives aux equipements sous pression nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    Mourlon, S.; Limousin, S.; Van Hoecke, J.C. [Autorite de surete nucleaire 6, place du Colonel Bourgoin 75012 Paris (France)

    2007-07-01

    French regulations on nuclear pressure equipment have been updated with the December 12, 2005 Order related to Nuclear Pressure Equipment, so-called 'ESPN Order'. This Order is at the junction of regulations covering safety on the one hand and pressure equipment on the other hand. As regards manufacturing, the ESPN Order extends to nuclear pressure equipment the approach and essential requirements of the European Pressure Equipment Directive (PED - transposed in France by the December 13, 1999 Decree) while adding specific nuclear and radiation safety requirements. For in-service inspection, it sets additional provisions to those of the December 13, 1999 Decree so that the nuclear and radiation safety requirements applying in nuclear facilities are also taken into account for those equipment. The specific case of PWR main primary and secondary systems is covered by the November 10, 1999 Order. The ESPN Order leaves a major part to industrial codes and standards. Its publication makes it necessary to check that the codes used for nuclear pressure equipment comply with the new requirements and may induce modifications of the codes. Furthermore, as the market for operators of nuclear facilities and manufacturers of mechanical equipment is becoming global, these evolutions should be considered in a worldwide context. Last, the Nuclear Transparency and Security Act of June 13, 2006 - which created the Nuclear safety authority (ASN) with competence over nuclear and radiation safety, covering specifically nuclear pressure equipment - will induce further amendments of regulations. (authors) [French] La reglementation francaise en matiere d equipements sous pression nucleaires a ete refondee avec la parution de l arrete du 12 decembre 2005 relatif aux equipements sous pression nucleaires, dit 'arrete ESPN'. Ce texte se situe a l intersection des reglementations en matiere de surete, d une part, et d equipements sous pression, d autre part. En matiere de

  15. The nuclear: energy and environmental stakes and political and strategic context; Le nucleaire: enjeux energetiques, environnementaux, et contexte politique et geostrategique

    Energy Technology Data Exchange (ETDEWEB)

    Lauvergeon, A

    2003-07-01

    This document mentions the intervention of Anne Lauvergeon, at the colloquium Adapes, ''the nuclear: energy and environmental stakes and political and geo-strategic context''. Anne Lauvergeon is president of the Areva board. This speech takes stock on the energy resources and demand facing the economic development in a context of an environmental quality and especially the part of the nuclear energy in the future. (A.L.B.)

  16. The opening of electricity markets: the stakes for the nuclear energy; L'ouverture des marches de l'electricite: les enjeux pour le nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    Maillard, M. [Ministere de l' Economie, des Finances et de l' Industrie, 75 - Paris (France). Direction Generale de L' Energie et des Matieres Premieres

    2002-07-01

    This article is a reprint of the opening talk of M. Maillard, general director of DGEMP (general direction of energy and raw materials, French ministry of economy, finances and industry), given at the 2002 annual meeting of the French society of nuclear energy (SFEN). In his talk, M. Maillard presents, first, the international context of the liberalization of electricity markets (the lessons learnt after the Californian crisis, the situation of the existing nuclear park, the questions relative to the nuclear revival, the conditions of a conservation of the nuclear option beyond the existing facilities). Then he analyzes the French situation and its specificities (pluri-annual planning of investments, mastered liberalization and competitiveness of the nuclear energy, preparation of future date-lines in agreement with the decommissioning of the oldest PWR reactors). (J.S.)

  17. Nuclear systems of the future. Stakes, R and D strategy, and international cooperation; Les systemes nucleaires du futur. Enjeux, strategie de recherche et developpement, et cooperation internationale

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-07-01

    As demonstrated by prospective studies, nuclear energy will represent a decisive contribution in the future energy mix. The long-term strategy of development of nuclear energy requires to foresee a new generation of nuclear systems, named generation 4. The goal of these new systems is to optimize the use of nuclear fuels, to minimize the generation of wastes and to enlarge the field of applications of nuclear energy to other applications like: hydrogen and synthetic fuels generation, heat generation for the industry etc. This document presents the French R and D strategy on nuclear systems of 4. generation that has been approved by the public authorities. This strategy follows three axes: a priority research on fast neutron systems with fuel recycle (sodium fast reactors (SFR) and gas fast reactors (GFR)), a research on key-technologies for the supply of very high temperature heat (very high temperature reactor (VHTR), fast and thermal neutron reactors, and water decomposition processes), and a continuation of researches on PWR reactors improvement. An integral recycling of all actinides in fast neutron reactors requires the development of new fuel reprocessing and fuel re-fabrication processes. A reference scenario for the progressive renewal of French nuclear facilities foresees the simultaneous development of fast neutron systems and the start-up of a new spent fuel reprocessing plant. France in involved in the development of the SFR, GFR and VHTR systems thanks to its participation to the Generation 4 international forum and to bilateral cooperation with other big nuclear partners like Russia and China. One of the main stakes of the French nuclear industry is to be able to invest in the R and D of future nuclear systems in order to valorize the experience gained so far in sodium FBR systems and in fuel cycle processes. (J.S.)

  18. Development of nuclear medicine techniques - radiation protection issues for patients; Evolution des techniques en medecine nucleaire - Enjeux de radioprotection pour les patients

    Energy Technology Data Exchange (ETDEWEB)

    Marchandise, Xavier [Faculte de Medecine de Lille, F-59045 Lille Cedex (France)

    2011-07-15

    Nuclear medicine uses radioactive isotopes for diagnostic or therapeutic purposes. The radiation protection culture is now well-anchored in the training of nuclear medicine specialists in France and must remain at the highest possible level. However, practices change and the immediate medical - or even media - interest in new equipment and new tracers must not obscure the fundamentals of patient radiation protection. Particular vigilance is today required with regard to two aspects: - children; - the corresponding computed tomography. (author)

  19. Treatment of effluent at the Saclay Centre d'Etudes Nucleaires (1960); Le traitement des effluents du Centre d'Etudes Nucleaires de Saclay (1960)

    Energy Technology Data Exchange (ETDEWEB)

    Wormser, G. [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

    1960-07-01

    The Centre d'Etudes Nucleaires at Saclay possesses several installations from which liquid radioactive effluent is rejected, and it has thus been found necessary to construct a station for the purification of radioactive liquids and to settle various chemical, analytical and technological problems. This report describes, in the following order: - the disposal possibilities at the Centre d'Etudes Nucleaires, Saclay, - the effluents produced at the centre, - the set-up for collecting effluent, - treatment of the effluent, - results of these treatments. (author) [French] La presence, au Centre d'Etudes Nucleaires de Saclay, de plusieurs installations susceptibles de rejeter des effluents liquides radioactifs a necessite la construction d'une station d'epuration d'eaux radioactives et la mise au point de differents problemes chimiques, analytiques et technologiques. Dans ce rapport, nous exposerons successivement: - les possibilites de rejet du Centre d'Etudes Nucleaires de Saclay, - les effluents du centre, - le dispositif de collecte des effluents, - le traitement de ces effluents, - les resultats de ces traitements. (auteur)

  20. Radiotoxicity, dose and nuclear alchemy; Radiotoxiciteit, dosis en nucleaire alchemie

    Energy Technology Data Exchange (ETDEWEB)

    Schram, R. [Nuclear Research and Consultancy Group NRG, Petten (Netherlands)

    2006-07-01

    An outline is given of the nuclear fuel cycle and related products, focusing on the radiotoxicity and radioactive waste dose. Also, it is explained how those subjects form the basis of research on transmutation and recycling of radioactive waste. Finally, attention will be paid to nuclear alchemy, i.e. the steps to be taken for transmutation and recycling, based on current developments in research at NRG. [Dutch] In dit artikel zal een toelichting worden gegeven op de splijtstofcyclus en de producten die daarbij vrijkomen. Hierbij zal worden ingegaan op de radiotoxiciteit en dosis van het radioactief anal. Tevens zal worden uitgelegd hoe deze begrippen de basis vormen voor keuzes binnen het onderzoek naar transmutatie en recycling van radioactief afval. Ook zal de nucleaire alchemie, de benodigde stappen voor transmutatie en recycling, worden behandeld aan de hand van de actuele ontwikkelingen in het onderzoek zoals onder meer uitgevoerd bij NRG.

  1. Treatment of effluent at the Saclay Centre d'Etudes Nucleaires (1960)

    International Nuclear Information System (INIS)

    Wormser, G.

    1960-01-01

    The Centre d'Etudes Nucleaires at Saclay possesses several installations from which liquid radioactive effluent is rejected, and it has thus been found necessary to construct a station for the purification of radioactive liquids and to settle various chemical, analytical and technological problems. This report describes, in the following order: - the disposal possibilities at the Centre d'Etudes Nucleaires, Saclay, - the effluents produced at the centre, - the set-up for collecting effluent, - treatment of the effluent, - results of these treatments. (author) [fr

  2. Nommer la drépanocytose dans l'espace francophone. : Espaces, histoire, enjeux

    OpenAIRE

    Lainé , Agnès

    2015-01-01

    International audience; La drépanocytose est devenu le terme scientifique le plus usuel dans l'espace francophone pour désigner la maladie que les Américains ont nommé Sickle cell anemia au début du XXe siècle. Mais d'autres noms scientifiques ont cohabité avec celui-ci, sans compter les nombreux noms vernaculaires. Cet court article propose un tour d'horizon de ces terminologies, ce qu'elles recouvrent et des enjeux passés et présents dont elles témoignent.

  3. Radiological terrorism: purposes and principles of medical response; Terrorisme radiologique: scenarios, enjeux et principes de prise en charge

    Energy Technology Data Exchange (ETDEWEB)

    Carbonieres, H. de; Laroche, P. [Hopital des Armees Percy, Service de Protection Radiologique, 92 - Clamart (France); Foehrenbach, H. [Hopital d' Instruction des Armees du Val-de-Grace, Service de Medecine Nucleaire, 75 - Paris (France)

    2006-08-15

    At the end of the 20. century and the beginning of the 21., some unmatched terrorist actions happened. They differ in their scale with the attack against the Twin Towers of the World Trade Center in 2001 or in the means used, spreading of neurotoxic war gases in the Tokyo underground in 1995 or pathogenic biological agents in the United States in 2001. Utilization of radioactive material on a large scale is still lacking. But this absence must not obscure the potentiality of such an action. In order to organize reaction plans, it is necessary to firstly consider the different possible kinds of actions. If the utilization of a nuclear weapon cannot be regarded as sheer terrorism, radioactive material spreading, whatever the mean used, and radioactive source leaving are generic types of action. From these, there is no limit for evil imagination to conceive a particular form of threatening an unprepared population. An attack against a nuclear plant is a peculiar way of radioactive material dispersal, highly symbolic since the Tchernobyl accident, but fortunately one of the most difficult to perform. (author)

  4. Conversations cruciales des outils pour s'exprimer quand les enjeux sont de taille

    CERN Document Server

    Patterson, Kerry; McMillan, Ron; Switzler, Al; Covey, Stephen R

    2009-01-01

    Quand on parle de " conversations cruciales ", il nous vient spontanément des images de présidents, d'empereurs et de Premiers ministres assis autour d'une table massive en train de débattre de l'avenir du monde. Les conversations dont parle cet ouvrage ne sont pas moins cruciales, nous concernent tous et peuvent survenir à n'importe quel moment dans notre vie quotidienne. Une discussion houleuse avec le patron, une dispute violente avec un collègue ou un client, un mot de trop adressé à notre conjoint, etc. Une conversation devient cruciale quand : les opinions en jeu sont opposées ; les enjeux sont importants ; les émotions sont fortes. Ce livre vous aide à vous exprimer habilement quand les enjeux sont de taille. Il vous explique comment atteindre le but que vous vous êtes fixé en usant des meilleures techniques et en ouvrant le chemin du dialogue. Il vous fournit les outils pour gérer les conversations les plus difficiles et les plus importantes de votre vie.

  5. Action publique et quartiers durables : enjeux cognitifs et organisationnels

    OpenAIRE

    Morin, Richard; Latendresse, Anne; Lozier, Nicolas

    2017-01-01

    Le développement durable (DD) qui repose sur trois principaux piliers, environnemental, économique et social, auquel s’est rajouté le culturel, est devenu un important référentiel des politiques publiques urbaines. À la suite de l’Agenda 21 du Sommet de Rio de 1992, des villes ont adopté des programmes d’actions locales en matière de DD. La conception et la mise en œuvre de ces programmes soulèvent des enjeux cognitifs et organisationnels. C’est le cas de la Ville de Montréal qui a d’abord mi...

  6. Les enjeux sportifs, juridiques et politiques de la binationalité dans le sport

    OpenAIRE

    Andrès, Hervé

    2017-01-01

    La question de la binationalité se pose dans le sport comme dans d’autres champs d’activité humaine, d’autant plus que le sport est marqué par la prépondérance du cadre national. Les sportifs binationaux bénéficient d’un surplus d’opportunités sportives et économiques, mais sont également placés devant des choix difficiles sur un plan identitaire ou affectif car ils sont pris par des enjeux politiques qui les dépassent. C’est surtout vis-à-vis de la sélection nationale que le problème est pos...

  7. Jeunes, politique et médias : enjeux de légitimités dans la Tunisie ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Jeunes, politique et médias : enjeux de légitimités dans la Tunisie postrévolutionnaire. Depuis la révolution de 2011, les jeunes représentent un défi fondamental pour la stabilité politique de la Tunisie. En effet, les jeunes Tunisiens incarnent vis-à-vis des autorités publiques de la période transitionnelle le croisement de ...

  8. Nuclear program of Iran. Towards de-escalation of a nuclear crisis. Advisory letter; Nucleair programma van Iran. Naar de-escalatie van een nucleaire crisis. Briefadvies

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2012-04-15

    The Dutch government, partly at the request of the House of Representatives (Second Chamber), the AIV asked to give an opinion about the position of Iran in the region and the role of the nuclear program of Iran in the geopolitical relations, in view of the most recent developments [Dutch] De Nederlandse regering heeft, mede op verzoek van de Tweede Kamer der Staten-Generaal, de AIV gevraagd advies uit te brengen over de positie van Iran in de regio en de rol van het nucleaire programma van Iran in de geopolitieke verhoudingen hierin, mede gelet op de meest recente ontwikkelingen.

  9. Principal component analysis

    NARCIS (Netherlands)

    Bro, R.; Smilde, A.K.

    2014-01-01

    Principal component analysis is one of the most important and powerful methods in chemometrics as well as in a wealth of other areas. This paper provides a description of how to understand, use, and interpret principal component analysis. The paper focuses on the use of principal component analysis

  10. Redesigning Principal Internships: Practicing Principals' Perspectives

    Science.gov (United States)

    Anast-May, Linda; Buckner, Barbara; Geer, Gregory

    2011-01-01

    Internship programs too often do not provide the types of experiences that effectively bridge the gap between theory and practice and prepare school leaders who are capable of leading and transforming schools. To help address this problem, the current study is directed at providing insight into practicing principals' views of the types of…

  11. Enjeux de la polémologie heideggerienne : entre Kriegsideologie et refondation politique

    Directory of Open Access Journals (Sweden)

    Servanne Jollivet

    2009-04-01

    Full Text Available Face au double écueil qui consiste à ne voir en la pensée de Heidegger qu’une pure dégénérescence idéologique ou, à l’inverse, à nier son engagement et ses enjeux proprement politiques, nous désirons ici questionner frontalement son projet politique tel qu’il apparaît dès le début des années 1930. Plus que de céder à la polémique, nous nous proposons ici, partant des présupposés propres à la révolution conservatrice, de retracer l’usage, dès Être et Temps et surtout dans le discours de Rectorat (1933, des notions de conflit ou combat (Kampf, qui trouveront par la suite à s’approfondir à travers la notion héraclitéenne de polemos. L’enjeu est pour nous d’éclairer le projet de refondation politique qui sous-tend cette « polémologie » en nous appuyant sur l’interprétation que donne Heidegger de la théorie hégélienne de l’État (cours de 1933-1934 et de la polis grecque, principalement dans l’Introduction à la métaphysique.

  12. Principal Ports and Facilities

    Data.gov (United States)

    California Natural Resource Agency — The Principal Port file contains USACE port codes, geographic locations (longitude, latitude), names, and commodity tonnage summaries (total tons, domestic, foreign,...

  13. What Motivates Principals?

    Science.gov (United States)

    Iannone, Ron

    1973-01-01

    Achievement and recognition were mentioned as factors appearing with greater frequency in principal's job satisfactions; school district policy and interpersonal relations were mentioned as job dissatisfactions. (Editor)

  14. Principal Ports and Facilities

    Data.gov (United States)

    California Department of Resources — The Principal Port file contains USACE port codes, geographic locations (longitude, latitude), names, and commodity tonnage summaries (total tons, domestic, foreign,...

  15. Principals as Instructional Leaders

    Science.gov (United States)

    Finkel, Ed

    2012-01-01

    At some level, principals always have been instructional leaders--but never before has their role been more prominent. First, the accountability movement--No Child Left Behind (NCLB) in particular--thrust principals into the spotlight on academic achievement. Then budget cuts peeled away capacity at both the district and school levels, thinning…

  16. Principal Preparation Programs

    Science.gov (United States)

    Butler, Kevin

    2008-01-01

    A school principal's job has never been tougher. The accountability movement--culminating with the federal No Child Left Behind law in 2001--has put pressure on principals to improve student performance, resulting in school leaders' transitioning from a more administrative role to becoming more heavily involved in assessment, instruction,…

  17. Principals' Perceptions of Politics

    Science.gov (United States)

    Tooms, Autumn K.; Kretovics, Mark A.; Smialek, Charles A.

    2007-01-01

    This study is an effort to examine principals' perceptions of workplace politics and its influence on their productivity and efficacy. A survey was used to explore the perceptions of current school administrators with regard to workplace politics. The instrument was disseminated to principals serving public schools in one Midwestern state in the…

  18. Qualities of Effective Principals

    Science.gov (United States)

    Stronge, James H.; Richard, Holly B.; Catano, Nancy

    2008-01-01

    You know how important principals are in advancing student achievement and school success, but it's not been exactly clear which components of the principal's job are the highest priority... until now. Following on the results-based approach from the ASCD best-seller "Qualities of Effective Teachers", James Stronge and his coauthors…

  19. Prix du pétrole : tendances à long terme et enjeux pour les biocarburants

    Directory of Open Access Journals (Sweden)

    Maisonnier Guy

    2013-09-01

    Full Text Available L’identification des grandes tendances et des paramètres critiques de l’évolution du prix du pétrole brut et des carburants est un des éléments avec la question du changement climatique pour définir des politiques publiques en matière de développement de filières de carburants alternatifs dans les transports. Le travail présenté ici essaie de proposer une grille d’analyse dans ce sens à la fois sur l’appréciation du marché à court terme (part des phénomènes géopolitiques et sur les scénarios possibles de long terme. Les notions de prix plancher (basé sur le coût marginal de production et de prix plafond (coût de solutions alternatives ou de substitution sont explicitées comme éléments définissant la fenêtre de variation des prix du pétrole brut sur un marché international. Des scénarios sur les changements possibles de l’offre (par exemple sur les bruts non conventionnels et de la demande (sous contrainte CO2 sont présentés pour évaluer cette fourchette possible : de 80 à 160 $/b en dollar constant. Les scénarios des prix des carburants et particulièrement celui du gazole sont ensuite déduits de cette analyse, à partir desquels sont positionnés les prix des biocarburants (ici issus des huiles végétales et donc les enjeux de leur compétitivité économique hors mécanismes d’incitation.

  20. Analytic index for nuclear physicians uses; Repertoire analytique a l'usage des physiciens nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    Ballini, R.; Barloutaud, R.; Bernas, R.; Bretonneau, P.; Chaminade, R.; Cohen, R.; Conjeaud, M.; Cotton, E.; Faraggi, H.; Grjebine, T.; Joffre, H.; Laboulaye, H. de; Lesueur, C.; Leveque, A.; Moreau, J.; Naggiar, V.; Papineau, L.; Prugne, P.; Schuhl, C.; Studinowski, FJ.; Netter, F.; Raievski, V.; Valladas, G. [Commissariat a l' Energie Atomique, Lab. du Fort de Chatillon, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires; Marty, N.; Renard, G. [College de France, Lab. de Chimie Nucleaire (France)

    The problem of the documentation in nuclear physics becomes constantly more complex. Every week brings its share of new publications, always more numerous and more varied. To remedy to this facts that we tried, in the service of Nuclear Physics of the CEA, to give to the documentation a character of a collective and systematized work. The present report covers the literature appeared between first January 1950 and first July 1951. (Volume 1: CEA report number 120; Volume 2: CEA report number 184). (M.B.) [French] Le probleme de la documentation en physique nucleaire devient sans cesse plus complexe. Chaque semaine apporte son lot de publications, toujours plus nombreuses et plus diversifiees. C'est pour essayer de porter remede a cet etat de choses que nous avons essaye, au service de Physique Nucleaire du C.E.A., de donner a la documentation le caractere d'un travail collectif systematise. Le present rapport couvre la litterature parue entre le premier Janvier 1950 et le premier Juillet 1951. (Tome 1: Rapport CEA numero 120; Tome 2: Rapport CEA numero 184). (M.B.)

  1. The formation of scientists and technicians at the 'Centre d'Etudes Nucleaires' at Saclay

    International Nuclear Information System (INIS)

    Debiesse, J.

    1958-01-01

    The considerable needs in research workers and scientists which are asked by the nuclear energy obliged the Commissariat a l'Energie atomique to deal with a particular effort to increase the quantitative and qualitative formation of scientists. Most various ways have been used. 1- A National Institute of Nuclear Sciences and Nuclear Techniques was created, by a joint decree of the Prime Minister and the Minister for National Education (june 18, 1957). This Institute of Higher Teaching (250 students) indulges in the following matters: atomic engineering, quantum mechanics, theory and technic of particle accelerators, special metallurgy, radiobiology, thermic and mechanics of fluids. 2- An associated centre of the 'Conservatoire National des Arts et Metiers' was created (200 students) for technical assistants, drawers, etc. 3- In contribution with both electronic industry and Ministry of Work, the Centre d'Etudes Nucleaires contributes to an accelerated formation of technical assistants into Professional Centres. Conclusion: Training of scientists and research workers is one of the most important activities of the Centre d'Etudes Nucleaires de Saclay. Without losing its technical efficiency, it has supplied and varied means adapted to the various purposes that we shall reach. (author) [fr

  2. Nuclear biological studies in France; Les etudes de biologie nucleaires en France

    Energy Technology Data Exchange (ETDEWEB)

    Coursaget, J. [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

    1961-07-01

    On the occasion of a colloquium on radiobiological research programmes, a number of documents dealing with French accomplishments and projects in this field were collected together. We felt that it would be useful to assemble these papers in one report; although they are brief and leave gaps to be filled in, they provide certain data, give an overall view of the situation, and can also suggest a rough plan for the general policy to adopt in the field of 'nuclear' biological research; i.e. research based on the nuclear tracer method or devoted to the action of ionising radiations. (author) [French] Un colloque sur les programmes de recherche en radiobiologie nous a donne l'occasion de reunir des documents sur les realisations et les projets francais dans ce domaine. Il nous a semble utile de reunir en un rapport l'ensemble de ces documents, qui, malgre leur brievete et malgre les lacunes qu'ils comportent, donnent un certain nombre d'informations, permettent une vue d'ensemble et peuvent dessiner aussi l'ebauche d'une politique coherente en matiere de recherches biologiques 'nucleaires', c'est-a-dire de recherches basees sur la methode des indicateurs nucleaires ou consacrees a l'action des rayonnements ionisants. (auteur)

  3. Multiscale principal component analysis

    International Nuclear Information System (INIS)

    Akinduko, A A; Gorban, A N

    2014-01-01

    Principal component analysis (PCA) is an important tool in exploring data. The conventional approach to PCA leads to a solution which favours the structures with large variances. This is sensitive to outliers and could obfuscate interesting underlying structures. One of the equivalent definitions of PCA is that it seeks the subspaces that maximize the sum of squared pairwise distances between data projections. This definition opens up more flexibility in the analysis of principal components which is useful in enhancing PCA. In this paper we introduce scales into PCA by maximizing only the sum of pairwise distances between projections for pairs of datapoints with distances within a chosen interval of values [l,u]. The resulting principal component decompositions in Multiscale PCA depend on point (l,u) on the plane and for each point we define projectors onto principal components. Cluster analysis of these projectors reveals the structures in the data at various scales. Each structure is described by the eigenvectors at the medoid point of the cluster which represent the structure. We also use the distortion of projections as a criterion for choosing an appropriate scale especially for data with outliers. This method was tested on both artificial distribution of data and real data. For data with multiscale structures, the method was able to reveal the different structures of the data and also to reduce the effect of outliers in the principal component analysis

  4. Euler principal component analysis

    NARCIS (Netherlands)

    Liwicki, Stephan; Tzimiropoulos, Georgios; Zafeiriou, Stefanos; Pantic, Maja

    Principal Component Analysis (PCA) is perhaps the most prominent learning tool for dimensionality reduction in pattern recognition and computer vision. However, the ℓ 2-norm employed by standard PCA is not robust to outliers. In this paper, we propose a kernel PCA method for fast and robust PCA,

  5. The Principal as CEO

    Science.gov (United States)

    Hollar, Charlie

    2004-01-01

    They may never grace the pages of The Wall Street Journal or Fortune magazine, but they might possibly be the most important CEOs in our country. They are elementary school principals. Each of them typically serves the learning needs of 350-400 clients (students) while overseeing a multimillion-dollar facility staffed by 20-25 teachers and 10-15…

  6. Strategic Principal Communication

    Science.gov (United States)

    Henry, Jake; Woody, Aaron

    2013-01-01

    As communities become increasingly diverse and criticism of traditional public schools intensifies, some states, such as North Carolina, have enacted legislation that encourages alternative forms of schooling. This condition has resulted in new challenges for principals to communicate broadly and often with stakeholders in an effort to build…

  7. Nuclear power: major issues for France's industrial, energy and environmental policies; L'industrie nucleaire: les grands enjeux pour la france en termes de politiques industrielle, energetique et environnementale

    Energy Technology Data Exchange (ETDEWEB)

    Fouquet, F.; Vincent, C.; Iglesias, F. [Ministere de l' Economie, des Finances et de l' Industrie, Industrie Nucleaire, 75 - Paris (France)

    2007-02-15

    France ranks second in the world as producer of electricity from atomic power, and first in Europe. Thanks to its nuclear plants, the country's rates of CO{sub 2} emissions per inhabitant and in proportion to its GDP are among the lowest in the EU. French nuclear power is a success story: it employs more than 110.000 people, and AREVA has become a world leader in the fuel cycle and in the design and construction of power plants. Recently passed laws will help maintain a lasting technological advance for France: a deliberate commitment to develop nuclear power systems and an appointment with parliament in 2015 (before the underground depository for spent fuel is opened), guaranteed funding for further research. (authors)

  8. Energy: nuclear energy; Energies: l'energie nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    Lung, M. [Societe Generale pour les Techniques Nouvelles (SGN), 78 - Saint-Quentin-en-Yvelines (France)

    2000-11-01

    Convinced that the nuclear energy will be the cleaner, safer, more economical and more respectful of the environment energy of the future, the author preconizes to study the way it can be implemented, to continue to improve its production, to understand its virtues and to better inform the public. He develops this opinion in the presentation of the principal characteristics of the nuclear energy: technology, radioactive wastes, radiation protection, the plutonium, the nuclear accidents, the proliferation risks, the economics and nuclear energy and competitiveness, development and sustainability. (A.L.B.)

  9. The 1989 annual report of the Institut de Physique Nucleaire-Orsay

    International Nuclear Information System (INIS)

    1989-01-01

    The activity report of the Institut de Physique Nucleaire (Orsay-France) from 1 Sep 1988 to 1 Aug 1989 is presented. Theoretical and experimental investigations were carried out in the following fields: light and medium exotic nuclei, on line spectroscopy, discrete high spin states, new radioactivities, thermal fission, detection systems, giant resonances, high excitation energy structure, reaction mechanisms at energies below 10 MeV/u and at 200 MeV/u and their evolution between 10 and 100 MeV/u, meson production, transfer reactions, spin modes in nuclei, dibaryonic resonances, inelastic scattering of polarized protons. Research programs in the field of radiochemistry and relating to inter-disciplinary fields are included. The activities involving teaching, the lists of publications conferences, seminars and theses are presented [fr

  10. The atomic energy course of the 'Institut National des Sciences et Techniques nucleaires' at the centre d'Etudes Nucleaires at Saclay; L'enseignement de genie atomique de l'Institut national des Sciences et Techniques nucleaires au Centre d'Etudes nucleaires de Saclay

    Energy Technology Data Exchange (ETDEWEB)

    Baissas, H. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1958-07-01

    foreign students. 8- Annexe: list of courses, practical work, pile projects drawn up by the 1957 students. (author)Fren. [French] 1- Les raisons de sa creation. L'electricite de France et l'industrie interessee par le developpement de l'Energie atomique ont demande au Commissariat a l'Energie atomique de former des ingenieurs capables d'etudier des projets de piles et de diriger leur construction. 2- Recrutement et Droits d'inscription. Les demandes d'inscription ont toujours depasse les possibilites. Cette annee, les cours sont suivis par 74 eleves permanents, dont 20 etrangers, et une centaine d'auditeurs libres. Tous les elevont deja ingenieurs ou nantis de grades universitaires eleves. Droit d'inscription: 250 000 F pour les eleves, 125 000 F pour les auditeurs. 3- Organisation de l'Enseignement. II comprend deux options: physique et chimie et dans chaque option: une centaine de conferences, une trentaine de travaux pratiques, des stages dans les services, l'etude d'un projet de reacteur par un groupe de 4 ou 5 eleves. L'ensemble occupe l'annee universitaire du 1 novembre au 14 juillet. 4- Sanction. Un examen final combinant les notes de deux epreuves theoriques, des travaux pratiques, du stage, et du projet conduit a un diplome d'ingenieur en genie atomique. Il n'est pas cree en realite de nouveaux ingenieurs; une mention nouvelle est seulement ajoutee a un diplome deja acquis. Les resultats ont toujours ete excellents. Le pourcentage des echecs est tres faible. 5- Placement des Diplomes. Ils reviennent tous dans leurs industries d'origine qui ont paye leurs salaires et les droits d'inscription en se privant de leurs services pendant les neuf mois de duree des cours. 6- Creations analogues. Un cours analogue a ete cree au Centre d'Etudes Nucleaires de Grenoble. Tandis que celui de SACLAY s'adresse plus specialement aux ingenieurs deja en fonctions, celui de Grenoble

  11. Le coupé décalé en Côte d'Ivoire : Sens et enjeux d'un succès musical

    African Journals Online (AJOL)

    8 mars 2007 ... Le coupé décalé en Côte d'Ivoire : Sens et enjeux d'un succès musical. Franck Gawa, l'université Félix-Houphouët Boigny d'Abidjan Cocody. Email : gfranckghislain@yahoo.com. Abstract. This article is an explanatory contribution of the current success of the cut offset a new Ivorian musical genre occurred ...

  12. French research in the field of nuclear agronomy; Les recherches francaises en agronomie nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    Guerin De Montgareuil, P. [Commissariat a l' Energie Atomique, Cadarache (France). Centre d' Etudes Nucleaires

    1964-07-01

    , industrial firms, university laboratories scientific institutes. The role of the Commissariat a l'Energie Atomique is defined: on the one hand it supplies information and support, and on the other hand it takes charge of specifically nuclear aspects of the work. Its part in the field has recently found expression in the creation, within the Biology Department, of a Radio-agronomy Section; its objective are described,, as well as the, means placed att its disposal at the Centre d'etudes Nucleaires, Cadarache. (author) [French] On propose un bilan des travaux les plus significatifs effectues en France depuis la deuxieme conference internationale en matiere d'agronomie nucleaire et qui vont d'une recherche apparemment desinteressee a l'application la plus directe. Une telle differenciation recouvre de moins en moins, au fur et a mesure de l'evolution des programmes, la distinction qui est faite dans l'expose entre l'action biologique des rayonnements et les autres emplois des techniques nucleaires. C'est ainsi que les recherches do radiogenetique agricole sont poursuivies dans deux directions: d'un point de vue theorique et methodologique avec l'etude comparative de l'action des divers types de rayonnements, l'influence du debit de dose et de la temperature, l'action des agents mutagenes chimiques, la production de chimeres sous irradiation gamma; et d'autre part, sous un aspect pratique aboutissant a la creation de varietes nouvelles plus resistantes ou plus precoces (riz, mil, arachide). Les problemes de destruction des insectes (eradication) et de conservation des denrees sous irradiation se trouvent egalement abordes par des voies et avec des objectifs tres divers. A la demarche globale representee par une irradiation pure et simple (grains humides, pommes de terre...) sont parfois associees des etudes souvent originales, d'ordre biochimique ou microbiologique (par exemple: alteration de l

  13. Principals' Supervision and Evaluation Cycles: Perspectives from Principals

    Science.gov (United States)

    Hvidston, David J.; McKim, Courtney Ann; Mette, Ian M.

    2016-01-01

    The goals for this quantitative study were to examine principals' perceptions regarding supervision and evaluation within their own evaluations. Three research questions guided the inquiry: (1) What are the perceptions of principals' regarding their own supervision?; (2) What are the perceptions of principals' regarding their own evaluation?; and…

  14. Principals' Relationship with Computer Technology

    Science.gov (United States)

    Brockmeier, Lantry L.; Sermon, Janet M.; Hope, Warren C.

    2005-01-01

    This investigation sought information about principals and their relationship with computer technology. Several questions were fundamental to the inquiry. Are principals prepared to facilitate the attainment of technology's promise through the integration of computer technology into the teaching and learning process? Are principals prepared to use…

  15. School Principals' Emotional Coping Process

    Science.gov (United States)

    Poirel, Emmanuel; Yvon, Frédéric

    2014-01-01

    The present study examines the emotional coping of school principals in Quebec. Emotional coping was measured by stimulated recall; six principals were filmed during a working day and presented a week later with their video showing stressful encounters. The results show that school principals experience anger because of reproaches from staff…

  16. Principals' Salaries, 2007-2008

    Science.gov (United States)

    Cooke, Willa D.; Licciardi, Chris

    2008-01-01

    How do salaries of elementary and middle school principals compare with those of other administrators and classroom teachers? Are increases in salaries of principals keeping pace with increases in salaries of classroom teachers? And how have principals' salaries fared over the years when the cost of living is taken into account? There are reliable…

  17. Legal Problems of the Principal.

    Science.gov (United States)

    Stern, Ralph D.; And Others

    The three talks included here treat aspects of the law--tort liability, student records, and the age of majority--as they relate to the principal. Specifically, the talk on torts deals with the consequences of principal negligence in the event of injuries to students. Assurance is given that a reasonable and prudent principal will have a minimum…

  18. Le principe roman

    CERN Document Server

    Ferrari, Jérôme

    2015-01-01

    Fasciné par la figure du physicien allemand Werner Heisenberg (1901-1976), fondateur de la mécanique quantique, inventeur du célèbre "principe d'incertitude" et Prix Nobel de physique en 1932, un jeune aspirant-philosophe désenchanté s'efforce, à l'aube du XXIe siècle, de considérer l'incomplétude de sa propre existence à l'aune des travaux et de la destinée de cet exceptionnel homme de sciences qui incarne pour lui la rencontre du langage scientifique et de la poésie, lesquels, chacun à leur manière, en ouvrant la voie au scandale de l'inédit, dessillent les yeux sur le monde pour en révéler la mystérieuse beauté que ne cessent de confisquer le matérialisme à l'œuvre dans l'Histoire des hommes.

  19. Principal oscillation patterns

    International Nuclear Information System (INIS)

    Storch, H. von; Buerger, G.; Storch, J.S. von

    1993-01-01

    The Principal Oscillation Pattern (POP) analysis is a technique which is used to simultaneously infer the characteristic patterns and time scales of a vector time series. The POPs may be seen as the normal modes of a linearized system whose system matrix is estimated from data. The concept of POP analysis is reviewed. Examples are used to illustrate the potential of the POP technique. The best defined POPs of tropospheric day-to-day variability coincide with the most unstable modes derived from linearized theory. POPs can be derived even from a space-time subset of data. POPs are successful in identifying two independent modes with similar time scales in the same data set. The POP method can also produce forecasts which may potentially be used as a reference for other forecast models. The conventional POP analysis technique has been generalized in various ways. In the cyclostationary POP analysis, the estimated system matrix is allowed to vary deterministically with an externally forced cycle. In the complex POP analysis not only the state of the system but also its ''momentum'' is modeled. Associated correlation patterns are a useful tool to describe the appearance of a signal previously identified by a POP analysis in other parameters. (orig.)

  20. Principal stratification in causal inference.

    Science.gov (United States)

    Frangakis, Constantine E; Rubin, Donald B

    2002-03-01

    Many scientific problems require that treatment comparisons be adjusted for posttreatment variables, but the estimands underlying standard methods are not causal effects. To address this deficiency, we propose a general framework for comparing treatments adjusting for posttreatment variables that yields principal effects based on principal stratification. Principal stratification with respect to a posttreatment variable is a cross-classification of subjects defined by the joint potential values of that posttreatment variable tinder each of the treatments being compared. Principal effects are causal effects within a principal stratum. The key property of principal strata is that they are not affected by treatment assignment and therefore can be used just as any pretreatment covariate. such as age category. As a result, the central property of our principal effects is that they are always causal effects and do not suffer from the complications of standard posttreatment-adjusted estimands. We discuss briefly that such principal causal effects are the link between three recent applications with adjustment for posttreatment variables: (i) treatment noncompliance, (ii) missing outcomes (dropout) following treatment noncompliance. and (iii) censoring by death. We then attack the problem of surrogate or biomarker endpoints, where we show, using principal causal effects, that all current definitions of surrogacy, even when perfectly true, do not generally have the desired interpretation as causal effects of treatment on outcome. We go on to forrmulate estimands based on principal stratification and principal causal effects and show their superiority.

  1. Principals' Perceptions Regarding Their Supervision and Evaluation

    Science.gov (United States)

    Hvidston, David J.; Range, Bret G.; McKim, Courtney Ann

    2015-01-01

    This study examined the perceptions of principals concerning principal evaluation and supervisory feedback. Principals were asked two open-ended questions. Respondents included 82 principals in the Rocky Mountain region. The emerging themes were "Superintendent Performance," "Principal Evaluation Components," "Specific…

  2. Les cartes ethno-démographiques de l’Afrique occidentale: enjeux d’une construction 1952-1963

    Directory of Open Access Journals (Sweden)

    Marie-Albane de Suremain

    2008-12-01

    Full Text Available Entre 1952 et 1963, l’Institut français d’Afrique noire publie cinq cartes ethno-démographiques représentant l’Afrique occidentale de manière très synthétique au 1/1 000 000. Signe d’une démarche scientifique encore très positiviste et descriptive, elles représentent la distribution démographique et la répartition ethnique de la population. Les difficultés sont multiples: comment figurer des populations en déplacement, dont les identités se laissent mal enfermer dans des taxonomies ethniques et sans unité de mesure commune? Cet ensemble est significatif des évolutions de la cartographie coloniale, qui prolonge en Afrique des ambitions encyclopédiques révolues en métropole et s’intéresse à la catégorisation ethnique de la population, ce qui renvoie à des enjeux politiques. Mais les ethnologues, sociologues et géographes inventent aussi de nouvelles manières d’aborder territoires et populations en Afrique.

  3. Les plantes génétiquement modifiées en Afrique : enjeux et recherches

    Directory of Open Access Journals (Sweden)

    De Lattre-Gasquet Marie

    2002-11-01

    Full Text Available En ce qui concerne la politique sur plantes génétiquement modifiées, l’Afrique est un terrain de luttes d’influence et de débats. Les enjeux sont à la fois économiques, politiques et écologiques. Dans cet article, nous montrons que les biotechnologies végétales sont l’une des techniques, à combiner avec d’autres, qui pourraient permettre d’assurer la sécurité alimentaire et sanitaire de l’Afrique, et que les risques qu’entraîneront l’utilisation de cette technique doivent être soigneusement analysés. Nous présenterons ensuite la position des différents pays africains vis-à-vis des conventions internationales (propriété intellectuelle, biosécurité et commerce et nous caractériserons leurs politiques nationales et de recherche vis-à-vis des OGM.

  4. Sport et éthique: enjeux et outils pour le marketing sportif - Sport and ethics: stakes and tools for marketing of sport

    OpenAIRE

    Emmanuel Bayle; Samuel Mercier

    2008-01-01

    (VF)Dans un contexte général d’une demande sociétale d’éthique, d’appel à la responsabilité sociale des entreprises et face aux attaques (dopage, violences, corruption…) que connaît aujourd’hui le mythe de l’éthique sportive, comment les organisations présentes dans le secteur du sport adaptent-elles leurs stratégies marketing ? Cet article propose une typologie des enjeux stratégiques de l’instrumentalisation de l’éthique sportive selon quatre types d’organisations. A partir de ce cadre conc...

  5. La question de la nationalité des sportifs camerounais : enjeux et défis à l'aune de la globalisation

    Directory of Open Access Journals (Sweden)

    Engamba Philomène Alene

    2016-01-01

    Cette étude permettra d'analyser les enjeux et les implications de la ruse de l'Etat camerounais, en vue de gérer un conflit entre logiques juridiques et symboliques stato-nationales, et logiques de gain liées à la construction de la carrière internationale des sportifs. Mais également cette réflexion s'ouvre sur la nécessité de l'urgence d'une refondation du code de la nationalité camerounaise.

  6. Méta-usages du numérique chez le manager : Nouveaux enjeux pour les formations dans l’enseignement supérieur

    OpenAIRE

    Mocquet, Bertrand; Rouissi, Soufiane

    2017-01-01

    Convaincus du rôle des universités dans le développement futur des organisations, nous porterons notre regard dans cet article sur les nouveaux enjeux de formation dans l’enseignement supérieur et de la recherche (ESR) pour prendre en compte la transformation numérique qui s’opère dans la société. Nous constatons deux mouvements combinés sur les usages du numérique dans les organisations publiques ou privées : l’aisance des usagers des services numériques des organisations et l’apparition de ...

  7. Le coupé décalé en Côte d'Ivoire : Sens et enjeux d'un succès musical

    African Journals Online (AJOL)

    8 mars 2007 ... de jeune, c'est qu'il trouve à travers cette catégorie sociale, les déterminants de son succès. Notre analyse ... En Côte d'Ivoire et partout ailleurs, il reste entendu que le coupé décalé échafaude la culture ... de conscience objective de l'espace territorial entendu comme le lieu où se déroulent des enjeux de ...

  8. Quelle évolution de la recherche agricole en réponse aux enjeux de l'agriculture au Nord-Cameroun ?

    OpenAIRE

    Njoya, Aboubakar

    2003-01-01

    International audience; Le Nord-Cameroun, constitué en majorité de ruraux vivant de l'agriculture familiale, est dans une phase de désengagement de l'Etat de certaines fonctions de production et de services du secteur agricole, et de décentralisation au profit des collectivités locales. lI s'ensuit des évolutions importantes dans le paysage institutionnel en charge du développement régional, et de nouveaux enjeux pour l'lnstitut de recherche agricole pour le développement (lRAD). L'implicatio...

  9. The Effective and Reflective Principal

    Science.gov (United States)

    Ritchie, John M.

    2013-01-01

    For a "Kappan" issue focusing on the job of the principal, this is an essay from a retired, longtime principal and superintendent. "I have notebooks full of advice that I've collected over the years: tips, mantras, cautions, and quotations appropriate for any occasion," the author says. "I learned to focus less on…

  10. Analytic catalog for the use of the nuclear physicists; Repertoire analytique a l'usage des physiciens nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    Ballini, R.; Barloutaud, R.; Bernas, R.; Chaminade, R.; Cohen, R.; Conjeaud, M.; Cotton, E.; Faraggi, H.; Grjebine, T.; Laboulaye, H. de; Lehmann, P.; Leveque, A.; Levi, C.; Moreau, J.; Naggiar, V.; Olkowsky, J.; Papineau, L.; Papineau, L.; Prugne, P.; Schuhl, C.; Szteinsznaider, D.; Tzara, C.; Valladas, G. [Commissariat a l' Energie Atomique, Saclay(France). Centre d' Etudes Nucleaires; Marty, N.; Renard, G. [College de France, Lab. de Chimie Nucleaire (France)

    1952-07-01

    The problem of the documentation in nuclear physics becomes constantly more complex. Every week brings its share of publications, always more numerous and more varied. To remedy to this problem, we tried, at the Nuclear Physics Services of the CEA, to give to the documentation the character of a collective and systematized work. The present report covers the literature appeared between January 1, 1950 and July 1, 1951. (Volume 1: CEA report number 120; Volume 2: CEA report number 184). (M.B.) [French] Le probleme de la documentation en physique nucleaire devient sans cesse plus complexe. Chaque semaine apporte son lot de publications, toujours plus nombreuses et plus diversifiees. C'est pour essayer de porter remede a cet etat de choses que nous avons essaye, au service de Physique Nucleaire du C.E.A., de donner a la documentation le caractere d'un travail collectif systematise. Le present rapport couvre la litterature parue entre le 1 Janvier 1950 et le 1 Juillet 1951. (Tome 1: Rapport CEA numero 120; Tome 2: Rapport CEA numero 184). (M.B.)

  11. Des enjeux éthiques et politiques dans l’œuvre d’Hermann Broch (1886-1951

    Directory of Open Access Journals (Sweden)

    Djéhanne Gani

    2009-12-01

    Full Text Available L’œuvre de Hermann Broch (1886-1951 est polymorphe, comportant romans, essais, correspondances, mêlant philosophie, histoire, psychanalyse et littérature. Cette diversité n’est pas, cependant, synonyme de dispersion puisque tous les écrits revêtent des enjeux éthiques et politiques. Broch, auteur engagé, concentre sa pensée sur l’homme, sa situation dans le monde moderne. L’absence d’ « un » sens et le sentiment de solitude forment la toile de fond de ses romans et de sa pensée. Son concept d’ « état crépusculaire » est à la fois symptôme et révélateur de la crise de l’homme et il montre le lien étroit entre théorie et création littéraire dans son œuvre. Dans un contexte marqué par l’expérience de l’antisémitisme et du totalitarisme, Broch développe une anthropologie de la responsabilité qui dénonce l’individualisme et l’indifférence. L’écriture relève pour lui de la « responsabilité sociale » et engage des enjeux éthiques et politiques. Hermann Broch croit à la « conversion » de ceux qui sont dans l’ « état crépusculaire » et qui somnolent. Il décrit la crise du monde moderne qu’il met en valeur, mais au-delà de l’analyse, sa réflexion a peut-être avant tout une visée pratique, comme son idée de la « conversion » en atteste. La dimension politique va de pair avec son engagement éthique. Il propose une éthique de l’humanité.Hermann Brochs (1886-1951 Werk ist äußerst vielseitig, es umfasst Romane, Essays, einen umfangreichen Briefwechsel und vermischt Philosophie, Geschichte, Psychoanalyse und Literatur. Diese Vielseitigkeit ist jedoch nicht gleichbedeutend mit Zerstreuung – Brochs Schriften vereint, dass sie sich alle mit Fragen von Politik und Ethik beschäftigen. Die Gedanken des engagierten Autors Broch sind auf den Menschen gerichtet, auf dessen Platz in der modernen Welt. Das Fehlen „eines“ Sinnes und das Gefühl der Einsamkeit bilden

  12. Fonctions et enjeux du berceau dans la première moitié du xixe siècle

    Directory of Open Access Journals (Sweden)

    Guillaume Garnier

    2012-11-01

    Full Text Available Dans les représentations traditionnelles, le berceau a toujours joué le rôle d’accueil du petit enfant. Associé au bercement, il assure le bien être de l’enfant et le prépare à un sommeil réparateur, nécessaire à son repos et à celui de sa famille. Le berceau joue alors au sens propre, comme au sens figuré, un rôle essentiel de protecteur. Pourtant, en se penchant sur les traités de soins pour les nouveau-nés et les traités d’éducation rédigés par des médecins dans la première moitié du XIXe siècle, on comprend que la place du berceau dans la cellule familiale est source de différents enjeux. La question d’employer un berceau pour faire reposer l’enfant, si elle semble évidente, n’a pas toujours répondu à une volonté d’assurer plus de confort à l’enfant. Elle correspond au contraire à une demande forte de la part des différentes autorités (médecins, théologiens, moralisateurs de bannir la cohabitation au sein du même lit entre enfants et parents, afin de proscrire les risques d’étouffement et d’infanticide. Pour autant, faire reposer un enfant dans un berceau, nécessite de bien définir les rôles de chacun (mère, nouveau-né, nourrice, père. Il s’agit d’une question essentielle d’éducation.

  13. Quand préoccupations environnementales et enjeux professionnels s'entrecroisent : le cas des entreprises participant aux essais de voitures électriques

    Directory of Open Access Journals (Sweden)

    Pierre Magali

    2014-07-01

    Full Text Available Des expérimentations visant à promouvoir le déploiement du véhicule électrique se sont fait jour dans le cadre de projets démonstrateurs, depuis quelques années. Elles ont en commun de proposer à des salariés d'utiliser ces voitures dans des conditions très similaires au futur proche. Ce texte vise à la fois à mettre en avant les raisons que les différentes parties prenantes – qu'il s'agisse des directions en charge des achats ou du développement durable, des gestionnaires de flotte, des utilisateurs finaux, etc. – ont de s'inscrire dans ces expérimentations, et à expliciter la prédominance des enjeux professionnels, qui continuent de déterminer le rapport à cette voiture. En effet, les registres professionnels (enjeux de reconnaissance, d'exemplarité et personnels se combinent dans l'adoption de cette technologie de mobilité durable, que la préoccupation environnementale ne suffit pas à expliquer.

  14. Les enjeux éthiques de l’élaboration des politiques publiques favorables à la santé : réflexion et illustration

    Directory of Open Access Journals (Sweden)

    Danielle Blondeau

    2011-06-01

    Full Text Available Au Québec, en vertu de la Loi sur la santé publique (L.R.Q. chapitre S-2.2, 2001, article 54, le ministre de la Santé a un droit de regard sur les mesures prévues par les autres ministères dans leurs lois et règlements qui pourraient avoir un impact significatif sur la santé de la population. Ainsi, les acteurs de santé publique du palier central ont cherché à soutenir la mise en oeuvre de cet article, de manière à favoriser l’adoption de politiques publiques favorables à la santé. Ce texte examine les enjeux éthiques liés à l’élaboration de telles politiques. Après avoir exposé les tensions entre bien individuel et bien commun ainsi que les valeurs de justice sociale, responsabilité et démocratie qui y sont reliées, nous illustrerons les enjeux éthiques à travers l’exemple du cinémomètre photographique comme mesure visant à augmenter la sécurité routière.

  15. Principal modes in multimode waveguides.

    Science.gov (United States)

    Fan, Shanhui; Kahn, Joseph M

    2005-01-15

    We generalize the concept of principal states of polarization and prove the existence of principal modes in multimode waveguides. Principal modes do not suffer from modal dispersion to first order of frequency variation and form orthogonal bases at both the input and the output ends of the waveguide. We show that principal modes are generally different from eigenmodes, even in uniform waveguides, unlike the special case of a single-mode fiber with uniform birefringence. The difference is most pronounced when different eigenmodes possess similar group velocities and when their field patterns vary as a function of frequency. This work may provide a new basis for analysis and control of dispersion in multimode fiber systems.

  16. Contribution to the study of thermal mixing between nuclear spin systems; Contribution a l'etude du melange thermique entre systemes de spins nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    Goldmann, M. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1967-02-15

    This work describes methods of dynamic nuclear polarization in solids based on the thermal mixing between nuclear spin systems. The description of the thermal mixing processes involves most of the fundamental aspects of the spin temperature theory. The experiments, conducted with paradichlorobenzene and para-dibromobenzene, yield a detailed confirmation of the theoretical predictions. (author) [French] Ce travail decrit des methodes de polarisation dynamique nucleaire dans les solides basees sur le melange thermique entre systemes de spins nucleaires. La description des processus de melange thermique met en jeu la plupart des aspects fondamentaux de la theorie de la temperature de spin. Les experiences, realisees avec du paradichlorobenzene et du paradibromobenzene, apportent une confirmation detaillee des previsions theoriques. (auteur)

  17. Le tourisme dans les îles et littoraux tropicaux : ressources et enjeux de développement

    Directory of Open Access Journals (Sweden)

    Olivier Dehoorne

    2008-09-01

    Full Text Available Cette étude souligne l’importance des enjeux touristiques pour les îles tropicales. La singularité des espaces est trop souvent négligée en raison de la vigueur des représentations fantasmées de l’île tropicale qui est perçue tel un lieu paradisiaque, un lieu d’accomplissement de désirs illimités  où s’écoule une vie facile, avec ses rivages ensoleillés, entre récifs coralliens et plages de sable blanc bordées de cocotiers. Ces richesses immatérielles reposent sur des ressources bien réelles, abondantes et vulnérables, à l’image des emblématiques récifs coralliens.Certes les destinations insulaires tropicales ne connaissent pas les niveaux de fréquentation des grandes régions du monde mais leurs flux doivent être reconsidérés au regard des caractéristiques de ces territoires (faible superficie, charge de population, rareté de la terre, limites des ressources qui nécessitent la définition d’indications spécifiques. Mais l’avènement d’un tourisme de masse dans ces ultimes frontières,  ces « Pleasure Periphery » nécessite de s’interroger sur la viabilité des stratégies de développement mises en œuvre autour du tourisme.This study highlights the importance of tourism issues for the tropical islands. The singularity of the spaces is too often overlooked because of the strength of fantasized representations of the tropical island which is seen as a paradise, a place of accomplishment desires unlimited with an easy life, with its sunny shores, between coral reefs and white sandy beaches lined with coconut trees. These intangible wealth are based on real resources, abundant and vulnerable,like the emblematic image of coral reefs. Although the tropical island destinations are not supported the weight of the major touristic regions of the world but their flows should be reconsidered in the light of the characteristics of these territories (small size, load population, shortage of land, limits

  18. Surface analysis the principal techniques

    CERN Document Server

    Vickerman, John C

    2009-01-01

    This completely updated and revised second edition of Surface Analysis: The Principal Techniques, deals with the characterisation and understanding of the outer layers of substrates, how they react, look and function which are all of interest to surface scientists. Within this comprehensive text, experts in each analysis area introduce the theory and practice of the principal techniques that have shown themselves to be effective in both basic research and in applied surface analysis. Examples of analysis are provided to facilitate the understanding of this topic and to show readers how they c

  19. Principal bundles the classical case

    CERN Document Server

    Sontz, Stephen Bruce

    2015-01-01

    This introductory graduate level text provides a relatively quick path to a special topic in classical differential geometry: principal bundles.  While the topic of principal bundles in differential geometry has become classic, even standard, material in the modern graduate mathematics curriculum, the unique approach taken in this text presents the material in a way that is intuitive for both students of mathematics and of physics. The goal of this book is to present important, modern geometric ideas in a form readily accessible to students and researchers in both the physics and mathematics communities, providing each with an understanding and appreciation of the language and ideas of the other.

  20. Economic consequences of the Swiss 'Sortir du nucleaire' and 'Moratoire-plus' popular initiatives - Analysis using a balanced model

    International Nuclear Information System (INIS)

    Mueller, A.; Wickart, M.; Van Nieuwkoop, R.

    2001-01-01

    This article is a short version of the ENET number 210359. This report for the Swiss Federal Office of Energy (SFOE) presents the results of a study made to assess the economic consequences of two models for the opting out of nuclear energy in Switzerland, as proposed in two popular initiatives. The 'Sortir du nucleaire' (electricity without atomic power) initiative calls for the shutting down of the existing nuclear power stations and the 'Moratoire-plus' initiative calls for a stop on the building of new atomic power stations for 10 years. The method used for assessing the costs and benefits resulting if the initiatives were accepted in a public vote is described. Basic assumptions made on further factors concerning the electricity and energy markets are discussed. Results of analyses made for various scenarios with respect to CO 2 emissions are presented and include discussions on risk costs, effects on employment and welfare aspects

  1. The Principal and Tort Liability.

    Science.gov (United States)

    Stern, Ralph D.

    The emphasis of this chapter is on the tort liability of principals, especially their commission of unintentional torts or torts resulting from negligent conduct. A tort is defined as a wrongful act, not including a breach of contract or trust, which results in injury to another's person, property, or reputation and for which the injured party is…

  2. Computer Use by Rural Principals.

    Science.gov (United States)

    Witten, D. W.; And Others

    Very little research is available nationwide that measures the administrative use of computers in rural schools. A state survey of 154 rural Kentucky secondary school principals (representing a 51% response rate) focused on their knowledge about computers and use of computers for school administrative purposes. Only 14% of respondents had a…

  3. School Uniforms: Guidelines for Principals.

    Science.gov (United States)

    Essex, Nathan L.

    2001-01-01

    Principals desiring to develop a school-uniform policy should involve parents, teachers, community leaders, and student representatives; beware restrictions on religious and political expression; provide flexibility and assistance for low-income families; implement a pilot program; align the policy with school-safety issues; and consider legal…

  4. Principal minors and rhombus tilings

    International Nuclear Information System (INIS)

    Kenyon, Richard; Pemantle, Robin

    2014-01-01

    The algebraic relations between the principal minors of a generic n × n matrix are somewhat mysterious, see e.g. Lin and Sturmfels (2009 J. Algebra 322 4121–31). We show, however, that by adding in certain almost principal minors, the ideal of relations is generated by translations of a single relation, the so-called hexahedron relation, which is a composition of six cluster mutations. We give in particular a Laurent-polynomial parameterization of the space of n × n matrices, whose parameters consist of certain principal and almost principal minors. The parameters naturally live on vertices and faces of the tiles in a rhombus tiling of a convex 2n-gon. A matrix is associated to an equivalence class of tilings, all related to each other by Yang–Baxter-like transformations. By specializing the initial data we can similarly parameterize the space of Hermitian symmetric matrices over R,C or H the quaternions. Moreover by further specialization we can parametrize the space of positive definite matrices over these rings. This article is part of a special issue of Journal of Physics A: Mathematical and Theoretical devoted to ‘Cluster algebras mathematical physics’. (paper)

  5. Principal Leadership in Taiwan Schools

    Science.gov (United States)

    Shouse, Roger C.; Lin, Kuan-Pei

    2010-01-01

    During the past two decades, Taiwan's Ministry of Education has responded to globalization by restructuring school curricular, instructional, and decision making practices along western lines in an attempt to attain legitimacy on the world stage. As a result, Taiwanese principals, once kings within their schools, now must share power with other…

  6. Fabrice Flipo, 2007, Justice, nature et liberté. Les enjeux de la crise écologique. Lyon, Parangon/Vs, 311 p.

    Directory of Open Access Journals (Sweden)

    Jérôme Ballet

    2008-07-01

    Full Text Available Le livre de Fabrice Flipo est une invitation à la réflexion autour des débats écologiques actuels. Il s’agit d’un ouvrage ambitieux. Il présente l’émergence de la crise écologique et en discute de nombreux enjeux d’un point de vue éthique, tout en utilisant des références provenant de différentes disciplines pour éclairer son propos. Si le livre est assez agréable à lire, ce n’est pas en raison des raccourcis médiatiques qu’il aurait pu prendre, l’auteur menant au contraire sa réflexion avec ...

  7. Les TIC au coeur des pédagogies universitaires diversité des enjeux pédagogiques et administratifs

    CERN Document Server

    Karsenti, Thierry

    2001-01-01

    Cet ouvrage illustre en quoi les TIC jouent un rôle si important en pédagogie universitaire et pourquoi ce virage technologique est devenu incontournable. Les auteurs font une place tant aux expériences qu'aux théories sur l'intégration des TIC. Il est question de la diversité des formes de recours aux TIC, des enjeux de leur intégration en milieu universitaire, des défis sociaux sous-jacents à cette incursion technologique, des cours sur le Web, de l'apprentissage collaboratif, de la supervision des stagiaires et de la réforme scolaire.

  8. Contribution to the study of molecular movements in cyclohexane by electron spin resonance and electron-nuclear double resonance using a radical probe; Contribution a l'etude des mouvements moleculaires dans le cyclohexane par resonance paramagnetique electronique et double resonance electronique-nucleaire a l'aide d'une sonde radicalaire

    Energy Technology Data Exchange (ETDEWEB)

    Volino, F. [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1969-07-01

    Solutions of stable free radicals of the nitroxide type have been studied as a function of temperature. In the plastic or globular state, the cyclohexane molecules have rapid rotational and diffusional movements. They transmit this movement to dissolved free radicals. Conversely, measurements by electron spin resonance of the absolute movement of the radicals, and by electron nuclear double resonance of their movement relative to the cyclohexane molecules give very precise methods for local analyses of the movement present in the cyclohexane matrix. The principle of these techniques makes up the 'radical probe method'. (author) [French] Des solutions de radicaux libres stables, du type nitroxyde dans le cyclohexane ont ete etudiees, en fonction de la temperature. Les molecules de cyclohexane, dans l'etat plastique ou globulaire, sont animees de mouvements rapides de rotation sur elles-memes et de diffusion. Elles transmettent leur mobilite aux radicaux libres dissous. Reciproquement, la mesure du mouvement absolu des radicaux, a l'aide de la resonance paramagnetique electronique, et celle du mouvement relatif des radicaux et des molecules de cyclohexane par double resonance electronique-nucleaire, constituent des methodes tres precises pour analyser localement les mouvements presents dans la matrice de cyclohexane. Ce principe et ces techniques constituent la 'methode de la sonde radicalaire'. (auteur)

  9. Principal chiral model on superspheres

    Energy Technology Data Exchange (ETDEWEB)

    Mitev, V.; Schomerus, V. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Quella, T. [Amsterdam Univ. (Netherlands). Inst. for Theoretical Physics

    2008-09-15

    We investigate the spectrum of the principal chiral model (PCM) on odd-dimensional superspheres as a function of the curvature radius R. For volume-filling branes on S{sup 3} {sup vertical} {sup stroke} {sup 2}, we compute the exact boundary spectrum as a function of R. The extension to higher dimensional superspheres is discussed, but not carried out in detail. Our results provide very convincing evidence in favor of the strong-weak coupling duality between supersphere PCMs and OSP(2S+2 vertical stroke 2S) Gross-Neveu models that was recently conjectured by Candu and Saleur. (orig.)

  10. Principal chiral model on superspheres

    International Nuclear Information System (INIS)

    Mitev, V.; Schomerus, V.; Quella, T.

    2008-09-01

    We investigate the spectrum of the principal chiral model (PCM) on odd-dimensional superspheres as a function of the curvature radius R. For volume-filling branes on S 3 vertical stroke 2 , we compute the exact boundary spectrum as a function of R. The extension to higher dimensional superspheres is discussed, but not carried out in detail. Our results provide very convincing evidence in favor of the strong-weak coupling duality between supersphere PCMs and OSP(2S+2 vertical stroke 2S) Gross-Neveu models that was recently conjectured by Candu and Saleur. (orig.)

  11. Principal Curves on Riemannian Manifolds

    DEFF Research Database (Denmark)

    Hauberg, Søren

    2015-01-01

    Euclidean statistics are often generalized to Riemannian manifolds by replacing straight-line interpolations with geodesic ones. While these Riemannian models are familiar-looking, they are restricted by the inflexibility of geodesics, and they rely on constructions which are optimal only...... in Euclidean domains. We consider extensions of Principal Component Analysis (PCA) to Riemannian manifolds. Classic Riemannian approaches seek a geodesic curve passing through the mean that optimize a criteria of interest. The requirements that the solution both is geodesic and must pass through the mean tend...

  12. Parametric functional principal component analysis.

    Science.gov (United States)

    Sang, Peijun; Wang, Liangliang; Cao, Jiguo

    2017-09-01

    Functional principal component analysis (FPCA) is a popular approach in functional data analysis to explore major sources of variation in a sample of random curves. These major sources of variation are represented by functional principal components (FPCs). Most existing FPCA approaches use a set of flexible basis functions such as B-spline basis to represent the FPCs, and control the smoothness of the FPCs by adding roughness penalties. However, the flexible representations pose difficulties for users to understand and interpret the FPCs. In this article, we consider a variety of applications of FPCA and find that, in many situations, the shapes of top FPCs are simple enough to be approximated using simple parametric functions. We propose a parametric approach to estimate the top FPCs to enhance their interpretability for users. Our parametric approach can also circumvent the smoothing parameter selecting process in conventional nonparametric FPCA methods. In addition, our simulation study shows that the proposed parametric FPCA is more robust when outlier curves exist. The parametric FPCA method is demonstrated by analyzing several datasets from a variety of applications. © 2017, The International Biometric Society.

  13. Jeux et enjeux olympiques

    Directory of Open Access Journals (Sweden)

    Pierre LEBLANC

    1989-06-01

    Full Text Available Les actes de candidatures et de choix des villes pour l'organisation des différentes sessions des Jeux Olympiques contemporains ne sont pas le fruit du hasard. Dans l'un et l'autre cas, il s'agit d'actes dont la signification s'inscrit dans le contexte politique du moment.

  14. Mouvements et enjeux sociaux

    International Development Research Centre (IDRC) Digital Library (Canada)

    20 févr. 2004 ... de ses valeurs morales essentielles, et d'autre part, une élite en puissance, scolarisée sous l'éclairage d'une morale positive, aspirant à une meilleure insertion sociale. Selon l'auteur précédent, ...... ainsi que celle sur la plus value ;. - l'élargissement de l'assiette fiscale surtout alors qu'il faut considérer ...

  15. Nuclear developments at the international inter govern mental level (1961); Developpements nucleaires sur le plan international intergouvernemental (1961)

    Energy Technology Data Exchange (ETDEWEB)

    Waynbaum, M. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1961-07-01

    The United Nations organisation and nuclear energy rose simultaneously, in 1945, to occupy an important place in the public eye. The spiritual succession of the League of Nations which had foundered during the war was taken up by the new organisation which sought to implant its political ideal in a more tangible reality, so that it might thereby be inspired by concrete and substantial objectives. This is one of the reasons for the existence of the dozen specialized agencies created by the family of the United Nations and dealing with Health, Culture, Agriculture, Finance, etc. Nuclear energy is one of these techniques. Becoming suddenly an important power factor and exploiting for itself the prestige of Science, it became the favorite domain for the growth of this new spirit, as much in its universal form in 1945 as in its more regional form which it was later to adopt. The achievements are numerous and of varying importance; they deserve te be studied carefully. (author) [French] L'organisation des Nations Unies et le nucleaire ont ete places simultanement, en 1945, au premier plan de la scene mondiale. La Societe des Nations ayant sombre pendant la guerre, son heritage spirituel fut recueilli par la nouvelle organisation qui chercha a enraciner son ideal politique dans une realite plus materielle, de facon a y puiser une nourriture concrete et substantielle. C'est une des raisons d'existence de la douzaine d'institutions specialisees gravitant dans la famille des Nations Unies et s'occupant de Sante, de Culture, d'Agriculture, de Finances, etc. Le nucleaire est l'une de ces techniques. Devenu soudainement un facteur primordial de puissance, Cristallisant a son benefice le prestige de la Science, c'etait un terrain de predilection pour le developpement du nouvel esprit, aussi bien sous la forme universelle de 1945, que sous les formes regionales qui ont vu le jour ensuite. Les travaux realises que nombreux, d

  16. On Bayesian Principal Component Analysis

    Czech Academy of Sciences Publication Activity Database

    Šmídl, Václav; Quinn, A.

    2007-01-01

    Roč. 51, č. 9 (2007), s. 4101-4123 ISSN 0167-9473 R&D Projects: GA MŠk(CZ) 1M0572 Institutional research plan: CEZ:AV0Z10750506 Keywords : Principal component analysis ( PCA ) * Variational bayes (VB) * von-Mises–Fisher distribution Subject RIV: BC - Control Systems Theory Impact factor: 1.029, year: 2007 http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V8V-4MYD60N-6&_user=10&_coverDate=05%2F15%2F2007&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=b8ea629d48df926fe18f9e5724c9003a

  17. Principal Metabolic Flux Mode Analysis.

    Science.gov (United States)

    Bhadra, Sahely; Blomberg, Peter; Castillo, Sandra; Rousu, Juho; Wren, Jonathan

    2018-02-06

    In the analysis of metabolism, two distinct and complementary approaches are frequently used: Principal component analysis (PCA) and stoichiometric flux analysis. PCA is able to capture the main modes of variability in a set of experiments and does not make many prior assumptions about the data, but does not inherently take into account the flux mode structure of metabolism. Stoichiometric flux analysis methods, such as Flux Balance Analysis (FBA) and Elementary Mode Analysis, on the other hand, are able to capture the metabolic flux modes, however, they are primarily designed for the analysis of single samples at a time, and not best suited for exploratory analysis on a large sets of samples. We propose a new methodology for the analysis of metabolism, called Principal Metabolic Flux Mode Analysis (PMFA), which marries the PCA and stoichiometric flux analysis approaches in an elegant regularized optimization framework. In short, the method incorporates a variance maximization objective form PCA coupled with a stoichiometric regularizer, which penalizes projections that are far from any flux modes of the network. For interpretability, we also introduce a sparse variant of PMFA that favours flux modes that contain a small number of reactions. Our experiments demonstrate the versatility and capabilities of our methodology. The proposed method can be applied to genome-scale metabolic network in efficient way as PMFA does not enumerate elementary modes. In addition, the method is more robust on out-of-steady steady-state experimental data than competing flux mode analysis approaches. Matlab software for PMFA and SPMFA and data set used for experiments are available in https://github.com/aalto-ics-kepaco/PMFA. sahely@iitpkd.ac.in, juho.rousu@aalto.fi, Peter.Blomberg@vtt.fi, Sandra.Castillo@vtt.fi. Detailed results are in Supplementary files. Supplementary data are available at https://github.com/aalto-ics-kepaco/PMFA/blob/master/Results.zip.

  18. Who Teaches, Who Principals, Who Learns?

    Science.gov (United States)

    O'Reilly, Gabrielle; Latimer, Milree

    An alternative framework that supports the collaboration of principals and teachers, with a focus on the changing roles of teachers and principals as learners and leaders, is presented. A conclusion is that as teachers' belief systems change to respect the image of the learner, principals' belief systems also change to reflect a new image of the…

  19. Principal-Counselor Collaboration and School Climate

    Science.gov (United States)

    Rock, Wendy D.; Remley, Theodore P.; Range, Lillian M.

    2017-01-01

    Examining whether principal-counselor collaboration and school climate were related, researchers sent 4,193 surveys to high school counselors in the United States and received 419 responses. As principal-counselor collaboration increased, there were increases in counselors viewing the principal as supportive, the teachers as regarding one another…

  20. A principal-agent Model of corruption

    NARCIS (Netherlands)

    Groenendijk, Nico

    1997-01-01

    One of the new avenues in the study of political corruption is that of neo-institutional economics, of which the principal-agent theory is a part. In this article a principal-agent model of corruption is presented, in which there are two principals (one of which is corrupting), and one agent (who is

  1. Principals as Assessment Leaders in Rural Schools

    Science.gov (United States)

    Renihan, Patrick; Noonan, Brian

    2012-01-01

    This article reports a study of rural school principals' assessment leadership roles and the impact of rural context on their work. The study involved three focus groups of principals serving small rural schools of varied size and grade configuration in three systems. Principals viewed assessment as a matter of teacher accountability and as a…

  2. Principal Stability and the Rural Divide

    Science.gov (United States)

    Pendola, Andrew; Fuller, Edward J.

    2018-01-01

    This article examines the unique features of the rural school context and how these features are associated with the stability of principals in these schools. Given the small but growing literature on the characteristics of rural principals, this study presents an exploratory analysis of principal stability across schools located in different…

  3. Leadership Coaching for Principals: A National Study

    Science.gov (United States)

    Wise, Donald; Cavazos, Blanca

    2017-01-01

    Surveys were sent to a large representative sample of public school principals in the United States asking if they had received leadership coaching. Comparison of responses to actual numbers of principals indicates that the sample represents the first national study of principal leadership coaching. Results indicate that approximately 50% of all…

  4. Gender and Perceptions: Females as Secondary Principals

    Science.gov (United States)

    Nogay, Kathleen; Beebe, Robert J.

    2008-01-01

    The purpose of this study was to investigate the perceptions of teachers and supervisors toward the principal leadership behaviors of female secondary principals in Ohio. Principal self-perceptions were also included to complete the study. The literature shows that women continue to be underrepresented in a field in which the majority of…

  5. 24 CFR 206.39 - Principal residence.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Principal residence. 206.39 Section... CONVERSION MORTGAGE INSURANCE Eligibility; Endorsement Eligible Mortgagors § 206.39 Principal residence. The property must be the principal residence of each mortgagor at closing. For purposes of this section, the...

  6. New Principal Coaching as a Safety Net

    Science.gov (United States)

    Celoria, Davide; Roberson, Ingrid

    2015-01-01

    This study examines new principal coaching as an induction process and explores the emotional dimensions of educational leadership. Twelve principal coaches and new principals--six of each--participated in this qualitative study that employed emergent coding (Creswell, 2008; Denzin, 2005; Glaser & Strauss, 1998; Spradley, 1979). The major…

  7. Principals' Collaborative Roles as Leaders for Learning

    Science.gov (United States)

    Kitchen, Margaret; Gray, Susan; Jeurissen, Maree

    2016-01-01

    This article draws on data from three multicultural New Zealand primary schools to reconceptualize principals' roles as leaders for learning. In doing so, the writers build on Sinnema and Robinson's (2012) article on goal setting in principal evaluation. Sinnema and Robinson found that even principals hand-picked for their experience fell short on…

  8. Teacher Supervision Practices and Principals' Characteristics

    Science.gov (United States)

    April, Daniel; Bouchamma, Yamina

    2015-01-01

    A questionnaire was used to determine the individual and collective teacher supervision practices of school principals and vice-principals in Québec (n = 39) who participated in a research-action study on pedagogical supervision. These practices were then analyzed in terms of the principals' sociodemographic and socioprofessional characteristics…

  9. Evolution of nuclear chemical industry in France; Evolution de l'industrie chimique nucleaire en France

    Energy Technology Data Exchange (ETDEWEB)

    Fould, M.H. [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

    1959-07-01

    'impulsion du CEA, mais aussi de maitres d'oeuvres tels qu'Electricite de France et la Marine Marchande, l'effort nucleaire fran is atteint pour les annees 1957-1961, environ 600 milliards de francs: plus de la moitie de cette somme sera depensee par l'industrie chimique en recherches, installations pilotes, constructions d'usines et livraisons. Faire bien, vite et rentable sont les buts recherches. Ces objectifs sont atteints grace a une collaboration intime des grands services de l'etat et de l'industrie privee. Ce gros effort s'exerce principalement dans les voies suivantes: - Un traitement chimique pousse de tonnages croissants des minerais de l'Union fran ise, visant a produire un uranium pur, abondant et bon marche. - Une preparation soigneuse de combustibles nucleaires economiques et parfaitement adaptes aux divers types de reacteurs en fonctionnement ou en construction. - Un retraitement des combustibles irradies pour en extraire le plutonium de facon complete ainsi que l'uranium et certains produits de fission. - Une fabrication industrielle des materiaux nucleairement purs ou resistants a la corrosion exiges par la technologie des reacteurs producteurs d'energie et de recherches. - La fourniture aux multiples utilisateurs etrangers et fran is d'isotopes et de traceurs radioactifs reclames par la medecine, l'industrie et l'agriculture en nombre toujours croissant. - Un traitement chimique meticuleux des effluents gazeux ou liquides dans des stations au controle rigoureux afin de rendre les reacteurs et leurs annexes parfaitement surs d'emploi. Cet expose aura montre l'ampleur de l'effort deploye par une industrie chimique nucleaire jeune, dynamique et en plein essor. Ayant assure ses techniques, realise de nombreuses installations, elle est largement en etat de faire face au programme atomique fran is. En outre, elle est capable et desireuse d'etre associee aux developpements de l

  10. Public debate about the EPR nuclear power plant at Flamanville; Debat public sur la centrale nucleaire EPR a Flamanville

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-07-01

    The project of building of he EPR reactor at Flamanville (Manche, France) has been submitted to the public debate. This document includes a presentation of the project and of the rules of the public debate, a synthesis of the file made by the prime contractor (EDF), a synthesis of the collective book of national actors concerned by the project (a group of associations for environment protection, Areva company, the ministries of economy and ecology, Global Chance, association of pro-nuclear ecologists (AEPN), 'Sortir du Nucleaire' (out-of nuclear) network, group of scientists for the information about nuclear (GSIEN), association for the promotion of the Flamanville site (Proflam), French nuclear energy society (SFEN) in association with 'Sauvons le Climat' (let's save climate), regional collective association 'EPR non merci, ni ailleurs, ni ici' (EPR, no thanks, neither elsewhere, nor here), NegaWatt), and 5 detailed books of actors: ACRO (association for the control of radioactivity in Western France), CFDT and CGT syndicates, the economic and social council of Basse Normandie region, and Proflam. (J.S.)

  11. Textes d'ouverture et de fermeture dans La nuit remue d'Henri Michaux : mises en jeu du principe de mobilité

    Directory of Open Access Journals (Sweden)

    Durain, Marc

    2013-09-01

    Full Text Available Résumé : Henri MICHAUX est à bien des égards un poète de la " situation ", au sens courant d'" ensemble des circonstances dans lesquelles une personne se trouve" (PETIT ROBERT, 2008 : 2379: les textes nous présentent souvent un être aux prises avec un monde agressif et impliqué dans des situations fâcheuses ; mais le sens premier, purement locatif du terme convient aussi parfaitement aux enjeux de son écriture : le " fait d'être en un lieu ", la " manière dont une chose est disposée, située ou orientée " (PETIT ROBERT, 2008 : 2379. C'est sur ce premier niveau sémantique que se fonde essentiellement l'étude qui va suivre. En prenant appui sur les deux textes-cadres que constituent le premier et le dernier poème du recueil La nuit remue, on se propose en effet d'observer une des manières dont se construit et se structure la relation à l'espace dans l'écriture michaldienne : autour du changement de situation. Ce changement - nous reprenons ici l'approche d'Andrée BORILLO dans son ouvrage La construction de l'espace en français- peut être de deux natures : le " changement d'emplacement ", où " le déplacement s'effectue tout en restant dans un même lieu établi ", et le " changement de lieu ", où se joue un véritable " changement de relation spatiale avec un lieu établi " (BORILLO, 1998 : 39. Nous avons choisi d'étudier conjointement ces deux modes de changement, les réunissant dans le cadre d'une exploration du principe de mobilité. Cette notion, on le verra, permet de rendre compte de bien des phénomènes à l'œuvre dans la poésie de MICHAUX : phénomènes d'ordre spatial, bien sûr, mais aussi d'ordre ontologique et linguistique. Les deux poèmes sélectionnés, " La nuit remue " et " L'avenir ", nous semblent des lieux tout désignés pour engager cette étude du principe de mobilité : il s'agit de textes-seuils, et en tant que tels, ils sont, dans l'ordre de la construction et de la lecture de l

  12. Teaching Principal Components Using Correlations.

    Science.gov (United States)

    Westfall, Peter H; Arias, Andrea L; Fulton, Lawrence V

    2017-01-01

    Introducing principal components (PCs) to students is difficult. First, the matrix algebra and mathematical maximization lemmas are daunting, especially for students in the social and behavioral sciences. Second, the standard motivation involving variance maximization subject to unit length constraint does not directly connect to the "variance explained" interpretation. Third, the unit length and uncorrelatedness constraints of the standard motivation do not allow re-scaling or oblique rotations, which are common in practice. Instead, we propose to motivate the subject in terms of optimizing (weighted) average proportions of variance explained in the original variables; this approach may be more intuitive, and hence easier to understand because it links directly to the familiar "R-squared" statistic. It also removes the need for unit length and uncorrelatedness constraints, provides a direct interpretation of "variance explained," and provides a direct answer to the question of whether to use covariance-based or correlation-based PCs. Furthermore, the presentation can be made without matrix algebra or optimization proofs. Modern tools from data science, including heat maps and text mining, provide further help in the interpretation and application of PCs; examples are given. Together, these techniques may be used to revise currently used methods for teaching and learning PCs in the behavioral sciences.

  13. Principal component regression analysis with SPSS.

    Science.gov (United States)

    Liu, R X; Kuang, J; Gong, Q; Hou, X L

    2003-06-01

    The paper introduces all indices of multicollinearity diagnoses, the basic principle of principal component regression and determination of 'best' equation method. The paper uses an example to describe how to do principal component regression analysis with SPSS 10.0: including all calculating processes of the principal component regression and all operations of linear regression, factor analysis, descriptives, compute variable and bivariate correlations procedures in SPSS 10.0. The principal component regression analysis can be used to overcome disturbance of the multicollinearity. The simplified, speeded up and accurate statistical effect is reached through the principal component regression analysis with SPSS.

  14. De la confiance à la cohésion sociale : enjeux conceptuels, indicateurs et effets économiques

    OpenAIRE

    Dimeglio, Isabelle

    2011-01-01

    The aim of the thesis is the analysis of the relationship between trust, social cohesion and performance. Through a critical analysis of the use of the notion of trust in economics, the thesis proposes a conceptual development leading to a three-dimensional conception of trust, a strategic trust, a personal trust and a generalized trust. Using a principal component analysis and processing data from the fifth wave of World Values Survey, we propose an empirical translation of this concept. The...

  15. Avis du Comité d’éthique du 7 mai 2015 « Les enjeux éthiques du partage des données scientifiques »

    OpenAIRE

    2016-01-01

    Groupe « Data sharing »Les enjeux éthiques du partage des données scientifiques Autosaisine 1- Depuis deux décennies, les données ont acquis un rôle central dans la production scientifique quelles que soient les disciplines. Les chercheurs ont de plus en plus besoin de vastes entrepôts de données (big data) – mais aussi de jeux de données de dimensions plus modestes (small data) – pour explorer, visualiser et comparer des résultats, valider des hypothèses ou en formuler de nouvelles, voire po...

  16. The nuclear power stations of the French atomic energy programme (1960); Les centrales nucleaires de puissance du programme francais (1960)

    Energy Technology Data Exchange (ETDEWEB)

    Leduc, C. [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires; Roux, J.P. [Electricite de France (EDF), 75 - Paris (France)

    1960-07-01

    After recalling the entry of nuclear energy into energy production in France, the paper emphasizes the evolution of techniques applied in the designing of French nuclear power plants and describes the means employed for reducing costs per kWh of EDF2 and EDF3 compared with EDF1: the electric power per ton of uranium varies from 493 kW/t for EDF1 to 970 kW/t for EDF3. For this purpose the thermal power and electric power of units are changed respectively from 290 MWt for EDF1 to 1200 or 1600 MWt for EDF3 and from 28 to 250 MW. The results are obtained by an improvement in neutronic characteristics, developments in nuclear fuel technology, and simplification of the system of charging the reactor, whose means of maintenance are increased; the EDF2 heat-exchangers have been so designed as to increase the unit power of the elements, which will attain 9 MWt, as against 3 for EDF1. For EDF3 an advance project forecasts a thermodynamic layout with only one pressure stage. The paper ends with a description of the burst-slug detection systems, and an appendix gives a detailed comparative table of EDF1, EDF2 and EDF3 plant characteristics. (author) [French] Apres avoir rappele l'integration de l'energie nucleaire parmi les moyens de production de l'energie en France, les auteurs se penchent surtout sur l'evolution des techniques appliquees dans l'equipement des centrales nucleaires francaises et decrivent les moyens mis en oeuvre pour reduire les prix de revient du kWh d'EDF2 et d'EDF3 par rapport a EDF1: la puissance electrique par tonne d'uranium varie de 493 kW/t pour EDF1 a 970 kW/t pour EDF3. C'est dans ce but que les puissances thermiques et la puissance unitaire des groupes turbo-alternateurs passent respectivement de 290 MWt pour EDF1 a 1200 ou 1600 MWt pour EDF3 et de 82 a 250 MW. Les resultats sont obtenus par une amelioration des caracteristiques neutroniques, des progres realises sur la technologie des elements

  17. Formation and linear amplification of signals in nuclear spectroscopy; Formation et amplification lineaire des signaux en spectroscopie nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    Le Du, R.; Mettes, J.D. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1967-07-01

    The apparatus described can be associated to various detectors used in nuclear physics, either rapid - its rise time is always under 30 nanoseconds - or slow, because of its continuous connections. Its gain can be increased very progressively from 2000 to 10 by increasing the feedback factors. The maximum permissible entry voltage, without causing any increase in the dead-time is 12 volts, whatever the value of the gain. The device is fitted with two continuous exits giving signals of equal amplitude but of opposite sign (10 volt pulses followed by a 4 volt undershoot). Its controls, all accessible, make it possible to adapt the apparatus very rapidly to various measurements. It is completely transistorized and the amplifier is fitted into a RENATRAN 2/8 drawer. A gain 4 preamplifier in the same drawer makes it possible to obtain a total gain of 8000. (authors) [French] L'appareil que nous decrivons peut etre associe aux divers detecteurs utilises en physique nucleaire, rapides - son temps de montee propre est toujours inferieur a 30 ns - ou lents, du fait de ses liaisons continues. Son gain peut etre amene tres progressivement de 2000 a 10 par l'augmentation graduelle des taux de contre-reaction utilises. La tension maxima admissible a l'entree, sans augmentation anormale du temps mort, est de 12 volts quel que soit le gain. L'appareil comporte deux sorties continues, delivrant des signaux d'amplitudes egales et de signes opposes (impulsions de 10 volts suivies d'un undershoot de 4 volts). Ses reglages, tous accessibles, permettent d'adapter tres rapidement l'appareil aux diverses mesures. Entierement transistorise, l'amplificateur est monte dans un tiroir RENATRAN 2/8. Un preamplificateur de gain 4, inclus dans le meme tiroir permet de porter le gain a 8000. (auteurs)

  18. Prospective analysis. Nuclear deterrence in 2030; Essai de prospective. La dissuasion nucleaire en 2030

    Energy Technology Data Exchange (ETDEWEB)

    Tertrais, B

    2006-12-15

    This study is a prospective analysis of the long-term future of nuclear weapons, and particularly the future of French nuclear deterrence after 2015. The selected time period is 2025-2030. The principal objective is to reflect on what the nuclear world might look like during the first part of the 21 st century, beyond the modernization decisions already planned or envisaged, and to draw conclusions for the future of the French deterrent. (author)

  19. Perceived Educational Values of Omani School Principals

    Science.gov (United States)

    Al-Ani, Wajeha Thabit; Al-Harthi, Aisha Salim

    2017-01-01

    This qualitative study investigated the perceived educational values of Omani school principals. Data were collected using a semi-structured interview form which focused on the core values of school administration as perceived by a sample of 44 school principals; a focus group interview was also held. Data were analysed using Nvivo software. The…

  20. Evaluation Priorities of Students, Teachers, and Principals.

    Science.gov (United States)

    Nevo, David; Stufflebeam, Daniel L.

    The main purposes of this study were to identify the evaluation needs of students, teachers, and principals, and to develop recommendations for an evaluation system within the school building. Students, teachers, and principals were surveyed to depict the availability and importance of eight different categories of evaluative information derived…

  1. Principals' Knowledge of and Attitudes toward Inclusion.

    Science.gov (United States)

    Barnett, Carol; Monda-Amaya, Lisa E.

    1998-01-01

    A survey of 65 elementary, junior, and high school principals investigated attitudes toward and knowledge of inclusion. No clear definition of inclusion emerged, but principals generally viewed inclusion as most appropriate for students with mild disabilities. Also, results indicated that teachers were not adequately prepared to implement…

  2. Perceptions of Online Credentials for School Principals

    Science.gov (United States)

    Richardson, Jayson W.; McLeod, Scott; Dikkers, Amy Garrett

    2011-01-01

    Purpose: The purpose of this study is to investigate the perceptions of human resource directors in the USA about online credentials earned by K-12 school principals and principal candidates. Design/methodology/approach: In this mixed methods study, a survey was sent to a random sample of 500 human resource directors in K-12 school districts…

  3. Primary School Principals' Self-Monitoring Skills

    Science.gov (United States)

    Konan, Necdet

    2015-01-01

    The aim of the present study is to identify primary school principals' self-monitoring skills. The study adopted the general survey model and its population comprised primary school principals serving in the city of Diyarbakir, Turkey, while 292 of these constituted the sample. Self-Monitoring Scale was used as the data collection instrument. In…

  4. Should Principals Know More about Law?

    Science.gov (United States)

    Doctor, Tyrus L.

    2013-01-01

    Educational law is a critical piece of the education conundrum. Principals reference law books on a daily basis in order to address the wide range of complex problems in the school system. A principal's knowledge of law issues and legal decision-making are essential to provide effective feedback for a successful school.

  5. Principals' Perceptions of School Public Relations

    Science.gov (United States)

    Morris, Robert C.; Chan, Tak Cheung; Patterson, Judith

    2009-01-01

    This study was designed to investigate school principals' perceptions on school public relations in five areas: community demographics, parental involvement, internal and external communications, school council issues, and community resources. Findings indicated that principals' concerns were as follows: rapid population growth, change of…

  6. Integrating Technology: The Principals' Role and Effect

    Science.gov (United States)

    Machado, Lucas J.; Chung, Chia-Jung

    2015-01-01

    There are many factors that influence technology integration in the classroom such as teacher willingness, availability of hardware, and professional development of staff. Taking into account these elements, this paper describes research on technology integration with a focus on principals' attitudes. The role of the principal in classroom…

  7. Principal Prep for Common Core Gaining Traction

    Science.gov (United States)

    Gewertz, Catherine

    2012-01-01

    A year ago, top officials in the school leadership world were worried. It seemed to them that principals were being overlooked in national conversations about how to get educators ready for the Common Core State Standards. But that is changing. The past six months have seen a surge of activity to acquaint principals with the new standards and…

  8. New pulser for principal PO power

    International Nuclear Information System (INIS)

    Coudert, G.

    1984-01-01

    The pulser of the principal power of the PS is the unit that makes it possible to generate the reference function of the voltage of the principal magnet. This function depends on time and on the magnetic field of the magnet. It also generates various synchronization and reference pulses

  9. An Examination of Principal Job Satisfaction

    Science.gov (United States)

    Pengilly, Michelle M.

    2010-01-01

    As education continues to succumb to deficits in budgets and increasingly high levels of student performance to meet the federal and state mandates, the quest to sustain and retain successful principals is imperative. The National Association of School Boards (1999) portrays effective principals as "linchpins" of school improvement and…

  10. A Latina Principal Leading for Social Justice

    Science.gov (United States)

    Hernandez, Frank; Murakami, Elizabeth T.; Cerecer, Patricia Quijada

    2014-01-01

    In this study, the role that racial identity plays among Latina school principals is examined through a case study of a principal in a K-3 elementary school. Based on a Latina/o critical race framework and a phenomenological research approach, the study explores the degree to which having a strong understanding of one's racial identity formation…

  11. Building Leadership Capacity to Support Principal Succession

    Science.gov (United States)

    Escalante, Karen Elizabeth

    2016-01-01

    This study applies transformational leadership theory practices, specifically inspiring a shared vision, modeling the way and enabling others to act to examine the purposeful ways in which principals work to build the next generation of teacher leaders in response to the dearth of K-12 principals. The purpose of this study was to discover how one…

  12. The Succession of a School Principal.

    Science.gov (United States)

    Fauske, Janice R.; Ogawa, Rodney T.

    Applying theory from organizational and cultural perspectives to succession of principals, this study observes and records the language and culture of a small suburban elementary school. The study's procedures included analyses of shared organizational understandings as well as identification of the principal's influence on the school. Analyses of…

  13. Balancing Acts: Women Principals at Work.

    Science.gov (United States)

    Smulyan, Lisa

    This book uses life history and ethnography to examine the lives and work of three female elementary school principals and highlights their daily use of personal and professional skills. The principals' personal backgrounds and their effect on their work are examined within the community they serve, their school, and the historical and social…

  14. Social Media Strategies for School Principals

    Science.gov (United States)

    Cox, Dan; McLeod, Scott

    2014-01-01

    The purpose of this qualitative study was to describe, analyze, and interpret the experiences of school principals who use multiple social media tools with stakeholders as part of their comprehensive communications practices. Additionally, it examined why school principals have chosen to communicate with their stakeholders through social media.…

  15. Geographical Distribution of Principals in Israeli Schools

    Science.gov (United States)

    Lebental, Dana M.

    2015-01-01

    This quantitative investigation focuses on women high school principals at Jewish secular schools throughout Israel. Despite challenges, Israeli women have succeeded in obtaining over half of the principal positions at Jewish secular high schools, but the degree to which there is equal gender access to leadership roles in the school system remains…

  16. Principals: Human Capital Managers at Every School

    Science.gov (United States)

    Kimball, Steven M.

    2011-01-01

    Being a principal is more than just being an instructional leader. Principals also must manage their schools' teaching talent in a strategic way so that it is linked to school instructional improvement strategies, to the competencies needed to enact the strategies, and to success in boosting student learning. Teacher acquisition and performance…

  17. New Principals' Perspectives of Their Multifaceted Roles

    Science.gov (United States)

    Gentilucci, James L.; Denti, Lou; Guaglianone, Curtis L.

    2013-01-01

    This study utilizes Symbolic Interactionism to explore perspectives of neophyte principals. Findings explain how these perspectives are modified through complex interactions throughout the school year, and they also suggest preparation programs can help new principals most effectively by teaching "soft" skills such as active listening…

  18. The Relationship between Principals' Managerial Approaches and ...

    African Journals Online (AJOL)

    Nekky Umera

    administered questionnaire from a sample of 211 teachers, 28 principals and .... education. For example, death of students in the wake of school violence is a loss of valuable investment in human capital. On the other hand, destruction ... principal's attitude, gender qualifications, and leadership experience (Green,. 1999 ...

  19. Principal G-bundles on nodal curves

    Indian Academy of Sciences (India)

    Springer Verlag Heidelberg #4 2048 1996 Dec 15 10:16:45

    If Y is reducible these notions depend on parameters a = (a1,...,aI ). The study of G-bundles on Y is done by extending the notion of (generalized) parabolic vector bundles [U1] to generalized parabolic principal G-bundles (called GPGs in short) on the curve C and using the correspondence between them and principal ...

  20. Assistant Principals and Reform: A Socialization Paradox?

    Science.gov (United States)

    Best, Marguerita L.

    2013-01-01

    Framed in the critical race theory of structuration (CRTS), this sequential explanatory mixed methods study seeks to identify the socialization practices by examining the realities of practices of assistant principals and the ways in which they impact the disciplinary actions of assistant principals at middle and high schools. The mixed methods…

  1. Elementary school principals' perceptions of childhood obesity.

    Science.gov (United States)

    Price, J H; Desmond, S M; Stelzer, C M

    1987-11-01

    This survey assessed school principals' perceptions regarding childhood obesity and the schools' role in dealing with the problem. A randomly selected group of 300 school principals was obtained from the National Association of Elementary School Principals; 227 (76%) administrators returned the questionnaire. Fifty-one percent of the principals believed normal weight was important to child health. Although 35% believed schools were not doing enough to alleviate childhood obesity, responses suggested principals oppose schools becoming obesity treatment centers. They do not believe teachers or parents would support such programs. They perceived the school's role to be educational and referral in nature. However, they supported elimination of "junk food" machines (71%) and provision of low calorie lunches (60%). They believed school nurses play the most important role in treating childhood obesity at school.

  2. Les « faux » mariages homosexuels de Sidi Ali au Maroc : enjeux d’un scandale médiatique

    Directory of Open Access Journals (Sweden)

    Florence Bergeaud-Blackler

    2012-01-01

    Full Text Available Les affaires de « mariages homosexuels » à Ksar el Kebir puis à Sidi Ali ont fait grand bruit dans la presse marocaine. Au-delà de l’émotion soulevée par le scandaleux amalgame entre l’institution respectée du mariage et une forme illégale de sexualité, elle a mis en évidence une transformation du traitement public de la question homosexuelle. Le changement de ton de la presse reflète-t-il celui de l’attitude de la société marocaine vis-à-vis de l’homosexualité ? Assiste-t-on à l’émergence d’une communauté homosexuelle militant pour la défense de ses droits ? Les « mariages » de Ksar el Kebir et de Sidi Ali constituent-ils des démonstrations visant à briser le tabou de l’homosexualité par l’émergence d’une « fierté » homosexuelle ? D’enquêtes menées à Sidi Ali, Fez et Casablanca, nous concluons que la médiatisation autour des affaires de mariages d’homosexuels a été un instrument d’une stratégie d’un « retour de la morale » aux relents nationalistes consécutive à la période d’establishement du roi Mohamed VI. L’article s’attache à montrer les enjeux locaux et nationaux d’une fausse chasse aux sorcières dans un pays où les conditions d’un débat sur la dépénalisation de l’homosexualité ne semblent pas encore réalisées.

  3. Des alliances d’action pour faire des enjeux sociétaux une source d’innovation, de création et de transformation

    Directory of Open Access Journals (Sweden)

    Philippe Lemoine

    2012-01-01

    Full Text Available Les rapports entre l’économie et les autres sphères de la société sont en train de se transformer, et avec eux, les expressions de la solidarité et les modèles d’engagement. Parmi eux, les alliances entre acteurs hétérogènes (entreprises, ONG et « social business », pouvoirs publics, acteurs de l’Internet, etc. permettent de s’attaquer aux grands enjeux de ce monde avec davantage de justesse et d’efficacité. En agrégeant des acteurs aux logiques différentes dans une dynamique de co-création, les alliances ouvrent de nouveaux horizons de développement. Avec la Clinton Global Initiative, Bill Clinton s’est donné comme objectif d’encourager les alliances sur des actions généreuses qui soient efficaces et mesurables. Si la dynamique fonctionne dans le monde anglo-saxon, elle peine à s’installer en Europe. Pourtant les acteurs européens disposent de nombreux atouts pour s’engager dans de nouvelles alliances transformatrices de notre monde et auraient tout intérêt, pour ce faire, à se fédérer. Plusieurs membres européens de la Clinton Global Initiative ont ainsi lancé le réseau « The European Network » pour amorcer un mouvement en Europe et donner une ambition européenne à l’engagement sociétal. Cet article décrit les singularités des alliances avant de présenter la structuration de l’action européenne en relation avec la Clinton Global Initiative.

  4. Principal Self-Efficacy and Work Engagement: Assessing a Norwegian Principal Self-Efficacy Scale

    Science.gov (United States)

    Federici, Roger A.; Skaalvik, Einar M.

    2011-01-01

    One purpose of the present study was to develop and test the factor structure of a multidimensional and hierarchical Norwegian Principal Self-Efficacy Scale (NPSES). Another purpose of the study was to investigate the relationship between principal self-efficacy and work engagement. Principal self-efficacy was measured by the 22-item NPSES. Work…

  5. Principal Time Management Skills: Explaining Patterns in Principals' Time Use, Job Stress, and Perceived Effectiveness

    Science.gov (United States)

    Grissom, Jason A.; Loeb, Susanna; Mitani, Hajime

    2015-01-01

    Purpose: Time demands faced by school principals make principals' work increasingly difficult. Research outside education suggests that effective time management skills may help principals meet job demands, reduce job stress, and improve their performance. The purpose of this paper is to investigate these hypotheses. Design/methodology/approach:…

  6. Aspiring Principals' Perception of the Challenges of Beginning Principals and the Support That They Need

    Science.gov (United States)

    Ng, Pak Tee

    2015-01-01

    This paper presents the results of an exploratory research project about the perception of aspiring principals regarding the challenges of beginning principals and the support that they need. These aspiring principals are participants on the Leaders in Education Programme (LEP) in Singapore. According to the research findings, the LEP participants…

  7. Comparative Analysis of Principals' Management Strategies in ...

    African Journals Online (AJOL)

    It was recommended among others that principals of secondary schools should adopt all the management strategies in this study as this will improve school administration and consequently students‟ academic performance. Keywords: Management Strategies; Secondary Schools; Administrative Effectiveness ...

  8. First-Year Principal Encounters Homophobia

    Science.gov (United States)

    Retelle, Ellen

    2011-01-01

    A 1st-year principal encounters homonegativity and an ethical dilemma when she attempts to terminate a teacher because of the teacher's inadequate and ineffective teaching. The teacher responds by threatening to "out" Ms. L. to the parents.

  9. Principal Hawaiian Islands Geoid Heights (GEOID96)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This 2' geoid height grid for the Principal Hawaiian Islands is distributed as a GEOID96 model. The computation used 61,000 terrestrial and marine gravity data held...

  10. Check List: Are You a Gifted Principal?

    Science.gov (United States)

    Taylor, Vicki L.

    1984-01-01

    An 18-item check list is provided for principals to evaluate themselves relative to encouraging gifts and talents of their most able students. Suggestions are given in the areas of educational needs, specialized materials, and counseling. (MC)

  11. Spatial control of groundwater contamination, using principal ...

    Indian Academy of Sciences (India)

    ; indexed wells; river basin; ... contamination. The numerical values of principal component (PC) loadings and scores are used (i) to interpret the relative importance of the chemi- ...... Berner E K and Berner R A 1987 The global water cycle ...

  12. Nutrition education for adolescents: principals' views.

    Science.gov (United States)

    Lai-Yeung, Wai-Ling Theresa

    2011-01-01

    This study aimed to examine school principals' perceptions of the school environment in Hong Kong as a context for the dissemination of food knowledge and inculcation of healthy eating habits. A questionnaire survey was administered in secondary schools in Hong Kong to survey Principals' views of students' food choices, operation of the school tuck shop, and promotion of healthy eating at school. Questionnaires were disseminated to all the secondary schools offering Home Economics (300 out of 466), and 188 schools responded, making up a response rate of 63%. Collected data were analyzed using SPSS. Most of the schools (82%) claimed to have a food policy to monitor the operation of the school canteen, and about half (52%) asserted there were insufficient resources to promote healthy eating at school. Principals (88%) generally considered it not acceptable for the school tuck shop to sell junk food; however, 45% thought that banning junk food at school would not help students develop good eating habits. Only 4% of the principals believed nutrition education influenced eating habits; whereas the majority (94%) felt that even with acquisition of food knowledge, students may not be able to put theory into practice. Cooking skills were considered important but principals (92%) considered transmission of cooking skills the responsibility of the students' families. Most of the principals (94%) believed that school-family collaboration is important in promoting healthy eating. Further efforts should be made to enhance the effectiveness of school food policies and to construct healthy school environments in secondary schools.

  13. Une espérance post-critique ? Enjeux critiques de la conception ricœurienne de l'imaginaire social

    Directory of Open Access Journals (Sweden)

    PEGGY AVEZ

    2014-12-01

    Full Text Available RésuméLa fondation anthropologique de la fonction critique – socialement endossée par l’imaginaire utopique – et son lien dynamique avec la tâche intégrative de l’idéologie permettent à Ricœur de repenser sur le plan socio-politique la double nécessité du soupçon et de l’espérance. En reliant l’analyse de la structure contradictoire et analogisante de l’imaginaire social aux perspectives antérieurement développées sur “la liberté selon l’espérance,” notre propos vise à expliciter ses enjeux émancipateurs. Les apories auxquelles les médiations symboliques contraignent l’agir doivent nourrir la double nécessité d’un “devoir de vigilance” et d’une “timide espérance”: telle est à la fois la difficulté irréductible et la force critique de l’analyse ricœurienne de l’imagination socialisante.Mots-clés: imaginaire social, critique, idéologie, utopie, espérance.AbstractThe anthropological foundation of the critical function—endorsed by the utopian imaginary—and its dynamic relation with the integrative task of ideology allow Ricœur to rethink, at a social and political level, the necessity of both suspicion and hope. Linking Ricœur’s analysis of the contradictory and analogizing structure of the social imaginary to perspectives on “freedom in the light of hope,” which were developed earlier, it is my intention to make explicit certain emancipatory issues. The aporiae to which symbolic mediations constrict acting must provide for the necessity of both an “obligation for vigilance” and a “tentative hope.” Such is the irreducible difficulty but also the critical force of Ricœur’s analysis of the socializing imagination.Keywords: Social Imaginary, Criticism, Ideology, Utopia, Hope.

  14. Enjeux communicationnels du Web 2.0 pour les Relations Publiques/Professional and organisational issues of Web 2.0 Public Relations

    Directory of Open Access Journals (Sweden)

    Francine Charest

    2012-12-01

    Full Text Available The Web 2.0, which includes Facebook, Twitter, Youtube and other social medias, is considered as to be one of the strongest communication tools of the early 21st century. TheWeb evolutionhas changed deeply the way Public relations agents operate. In 2009, Charest and Bédard have shown that the Web 2.0 was in fact a reclaim by the internet users of the Web as it was first imagined by Tim Berners-Lee in November 1993 : a tool to exchange and share information. The Web first generation has instead been used by the administrators for dissemination and promotion. Today, in order to appropriate themselves these new medias, PR agents have to findnew business models, even new ways to communicate.RésuméLe Web 2.0, regroupant les Facebook, Twitter, YouTube et autres médias sociaux, est considéré comme l’un des plus puissants outils de communication, en ce début de XX1 siècle. C’est sous l’angle de mutations qu’il induit sur les pratiques des professionnels en relations publiques, qu’il nous intéresse d’étudier les enjeux de l’évolution des usages du Web 2.0. Charest et Bédard ont montré en 2009 que le Web 2.0 était la revanche des internautes qui tentent de se réapproprier le Web tel qu’il avait été conçu par Tim Berners-Lee en novembre 1993, soit comme un outil d’échange et de partage d’information. Il a été clairement montré que la première générationde Web a plutôt été utilisée par les gestionnaires à des fins de diffusion et de promotion. L’appropriation de ces nouveaux médias par les relationnistes passe nécessairement par de nouveaux modèles d’affaires, voire de nouvelles façons de communiquer.

  15. Data structure characterization of miltispectral data using principal component and principal factor analysis

    Science.gov (United States)

    Lee, Jae K.; Mausel, Paul W.; Lulla, Kamlesh P.

    1989-01-01

    Both principal component analysis (PCA) and principal factor analysis (PFA) were used to analyze an experimental multispectral data structure in terms of common and unique variance. Only the common variance of the multispectral data was associated with the principal factor, while higher-order principal components were associated with both common and unique variance. The unique variance was found to represent small spectral variations within each cover type as well as noise vectors, and was most abundant in the lower-order principal components. The lower-order principal components can be useful in research designed to discriminate minor physical variations within features, and to highlight localized change when using multitemporal-multispectral data. Conversely, PFA of the multispectral data provided an insight into a great potential for discriminating basic land-cover types by excluding the unique variance which was related to the noise and minor spectral variations.

  16. Promoting principals' managerial involvement in instructional improvement

    Science.gov (United States)

    Gillat, Alex; Sulzer-Azaroff, Beth

    1994-01-01

    Studies of school leadership suggest that visiting classrooms, emphasizing achievement and training, and supporting teachers are important indicators of the effectiveness of school principals. The utility of a behavior-analytic program to support the enhancement of these behaviors in 2 school principals and the impact of their involvement upon teachers' and students' performances in three classes were examined in two experiments, one at an elementary school and another at a secondary school. Treatment conditions consisted of helping the principal or teacher to schedule his or her time and to use goal setting, feedback, and praise. A withdrawal design (Experiment 1) and a multiple baseline across classrooms (Experiment 2) showed that the principal's and teacher's rates of praise, feedback, and goal setting increased during the intervention, and were associated with improvements in the academic performance of the students. In the future, school psychologists might analyze the impact of involving themselves in supporting the principal's involvement in improving students' and teachers' performances or in playing a similar leadership role themselves. PMID:16795819

  17. Choreographies with Secure Boxes and Compromised Principals

    DEFF Research Database (Denmark)

    Carbone, Marco; Guttman, Joshua

    2009-01-01

      We equip choreography-level session descriptions with a simple abstraction of a security infrastruc- ture. Message components may be enclosed within (possibly nested) ”boxes” annotated with the intended source and destination of those components. The boxes are to be implemented with cryp......- tography. Strand spaces provide a semantics for these choreographies, in which some roles may be played by compromised principals. A skeleton is a partially ordered structure containing local behaviors (strands) executed by regular (non-compromised) principals. A skeleton is realized if it contains enough...... it embeds. Second, if no step is possible from a skeleton A, then A is DG realized. Finally, if a DG realized A′ is accessible from A, then A′ is minimal. Thus, the transition system provides a systematic way to construct the possible behaviors of the choreography, in the presence of compromised principals.  ...

  18. Principals, Trust, and Cultivating Vibrant Schools

    Directory of Open Access Journals (Sweden)

    Megan Tschannen-Moran

    2015-03-01

    Full Text Available Although principals are ultimately held accountable to student learning in their buildings, the most consistent research results have suggested that their impact on student achievement is largely indirect. Leithwood, Patten, and Jantzi proposed four paths through which this indirect influence would flow, and the purpose of this special issue is to examine in greater depth these mediating variables. Among mediating variables, we assert that trust is key. In this paper, we explore the evidence that points to the role that faculty trust in the principal plays in student learning and how principals can cultivate trust by attending to the five facets of trust, as well as the correlates of trust that mediate student learning, including academic press, collective teacher efficacy, and teacher professionalism. We argue that trust plays a role in each of the four paths identified by Leithwood, Patten, and Jantzi. Finally, we explore possible new directions for future research.

  19. Principal component regression for crop yield estimation

    CERN Document Server

    Suryanarayana, T M V

    2016-01-01

    This book highlights the estimation of crop yield in Central Gujarat, especially with regard to the development of Multiple Regression Models and Principal Component Regression (PCR) models using climatological parameters as independent variables and crop yield as a dependent variable. It subsequently compares the multiple linear regression (MLR) and PCR results, and discusses the significance of PCR for crop yield estimation. In this context, the book also covers Principal Component Analysis (PCA), a statistical procedure used to reduce a number of correlated variables into a smaller number of uncorrelated variables called principal components (PC). This book will be helpful to the students and researchers, starting their works on climate and agriculture, mainly focussing on estimation models. The flow of chapters takes the readers in a smooth path, in understanding climate and weather and impact of climate change, and gradually proceeds towards downscaling techniques and then finally towards development of ...

  20. Constrained principal component analysis and related techniques

    CERN Document Server

    Takane, Yoshio

    2013-01-01

    In multivariate data analysis, regression techniques predict one set of variables from another while principal component analysis (PCA) finds a subspace of minimal dimensionality that captures the largest variability in the data. How can regression analysis and PCA be combined in a beneficial way? Why and when is it a good idea to combine them? What kind of benefits are we getting from them? Addressing these questions, Constrained Principal Component Analysis and Related Techniques shows how constrained PCA (CPCA) offers a unified framework for these approaches.The book begins with four concre

  1. Geometry of Quantum Principal Bundles. Pt. 1

    International Nuclear Information System (INIS)

    Durdevic, M.

    1996-01-01

    A theory of principal bundles possessing quantum structure groups and classical base manifolds is presented. Structural analysis of such quantum principal bundles is performed. A differential calculus is constructed, combining differential forms on the base manifold with an appropriate differential calculus on the structure quantum group. Relations between the calculus on the group and the calculus on the bundle are investigated. A concept of (pseudo)tensoriality is formulated. The formalism of connections is developed. In particular, operators of horizontal projection, covariant derivative and curvature are constructed and analyzed. Generalizations of the first Structure Equation and of the Bianchi identity are found. Illustrative examples are presented. (orig.)

  2. Evaluating the Effectiveness of Traditional and Alternative Principal Preparation Programs

    Science.gov (United States)

    Pannell, Summer; Peltier-Glaze, Bernnell M.; Haynes, Ingrid; Davis, Delilah; Skelton, Carrie

    2015-01-01

    This study sought to determine the effectiveness on increasing student achievement of principals trained in a traditional principal preparation program and those trained in an alternate route principal preparation program within the same Mississippi university. Sixty-six Mississippi principals and assistant principals participated in the study. Of…

  3. Riccati transformations and principal solutions of discrete linear systems

    International Nuclear Information System (INIS)

    Ahlbrandt, C.D.; Hooker, J.W.

    1984-01-01

    Consider a second-order linear matrix difference equation. A definition of principal and anti-principal, or recessive and dominant, solutions of the equation are given and the existence of principal and anti-principal solutions and the essential uniqueness of principal solutions is proven

  4. La prévention en santé comme instrument de gestion du personnel : enjeux organisationnels et communicationnels autour du dépistage de la consommation des substances psychoactives à la SNCF

    OpenAIRE

    Lemaître, Félix

    2015-01-01

    Et si l’entreprise était une organisation de santé ? À travers le cas de l’appropriation du problème public des substances psychoactives à la SNCF nous analysons les formes de la santé au travail et la division du travail de suivi du salarié. Nous abordons deux dimensions : les reconfigurations organisationnelles autour du dépistage et les enjeux communicationnels de la prévention. Il apparaît qu’on ne peut réduire l’organisation de la santé dans le monde du travail à la logique de rentabilit...

  5. A Conceptual Framework for Understanding the Working Relationship between School Principals and Vice-Principals

    Science.gov (United States)

    Wong, Ping-Man

    2009-01-01

    Vice-principals' role and their relationship with principals are of paramount importance in shaping the effectiveness of school management, particularly after the implementation of school-based management (SBM) worldwide. This paper reports primarily on prior studies on the vice-principalship and suggests a framework to help explain the different…

  6. Statewide Data on Supply and Demand of Principals after Policy Changes to Principal Preparation in Illinois

    Science.gov (United States)

    Haller, Alicia; Hunt, Erika

    2016-01-01

    Research has demonstrated that principals have a powerful impact on school improvement and student learning. Principals play a vital role in recruiting, developing, and retaining effective teachers; creating a school-wide culture of learning; and implementing a continuous improvement plan aimed at increasing student achievement. Leithwood, Louis,…

  7. Principal Self-Efficacy, Teacher Perceptions of Principal Performance, and Teacher Job Satisfaction

    Science.gov (United States)

    Evans, Molly Lynn

    2016-01-01

    In public schools, the principal's role is of paramount importance in influencing teachers to excel and to keep their job satisfaction high. The self-efficacy of leaders is an important characteristic of leadership, but this issue has not been extensively explored in school principals. Using internet-based questionnaires, this study obtained…

  8. Particles identification using nuclear emulsion in OPERA; Identification des particules par les emulsions nucleaires dans OPERA

    Energy Technology Data Exchange (ETDEWEB)

    Manai, K

    2007-10-15

    The Opera experiment will try to confirm the {nu}{sub {mu}} {yields} {nu}{sub {tau}} oscillations by the appearance of the {nu}{sub {tau}} in a pure {nu}{sub {mu}} beam. Indeed, a neutrino beam almost pure is produced at CERN (CNGS Beam) and sent to the Opera detector. The detector is composed of two muons spectrometers and a target formed by walls of bricks. Each brick is an alternation of lead plates and emulsions. This modular structure allows to reconstruct the kink topology of the {tau} lepton decay with a high spatial resolution. The great challenge of the Opera experiment is to detect the {nu}{sub {tau}} interactions with the less uncertainty. To reduce this uncertainty it is essential to identify with the greatest efficiency any background event not including a tau particle. My work permits to reduce background. My principal contribution concerns the selection development, the reconstruction and the muons identification at low energy. This work is based on the setting of variables related to the deposit energy and the multiple scattering. Previously, only deposit energy was used in the analyses of pion/muon separation. This study allows doubling the muon identification efficiency at low energy. This leads to increase the background events rejection in Opera and to decrease the contamination by 30%. I also studied the nuclear emulsions capacity to identify charged particles through the analysis of a test beam carried out by the Nagoya group. This test contains protons and pions with different energies. My work proves that the European scan system gives comparable results with those obtained by the Japanese scan system. (author)

  9. Improving Principals' Instructional Leadership through Peer Coaching.

    Science.gov (United States)

    Roberts, Jo

    1991-01-01

    Describes an elementary peer leadership coaching project that enabled principals to improve their instructional leadership skills. Project evaluation indicated there was self-perceived growth in instructional leadership. Coaches underestimated the power of active listening. Specific peer matches did not affect the results. Flexibility,…

  10. relationship between principals' management approaches and ...

    African Journals Online (AJOL)

    Admin

    relationship between principals' management approaches and level of students' discipline in selected public secondary schools in Nyandarua and Laikipia districts, Kenya. Analysis of the relationship was based on school- size. Data were collected using a self-administered questionnaire from a sample of. 211 teachers, 28 ...

  11. How To Select a Good Assistant Principal.

    Science.gov (United States)

    Holman, Linda J.

    1997-01-01

    Notes that a well-structured job profile and interview can provide insight into the key qualities of an effective assistant principal. These include organizational skills, basic accounting knowledge, interpersonal skills, dependability, strong work ethic, effective problem-solving skills, leadership skills, written communication skills,…

  12. Summer Principals'/Directors' Orientation Training Module.

    Science.gov (United States)

    Mata, Robert L.; Garcia, Richard L.

    Intended to provide current or potential project principals/directors with the basic knowledge, skills, abilities, and sensitivities needed to manage a summer migrant school project in the local educational setting, this module provides instruction in the project management areas of planning, preparation, control, and termination. The module…

  13. Constructing principals' professional identities through life stories ...

    African Journals Online (AJOL)

    Adopting a humanistic perspective to the study of leadership, I discuss and describe how school principals adapt to their new roles, owing to the new education policies and educational restructuring within the South African. Department of Education. The Life History approach was used to collect data from six selected ...

  14. relationship between principals' management approaches and ...

    African Journals Online (AJOL)

    Admin

    management approach is more likely to increase teachers' and parental input on discipline ... satisfaction, which is a critical correlate of .... academic life. For this reason, this category of principals will rarely enlist the support of teachers and parents in their effort to enhance discipline. This may impact negatively on the ...

  15. Probabilistic Principal Component Analysis for Metabolomic Data.

    LENUS (Irish Health Repository)

    Nyamundanda, Gift

    2010-11-23

    Abstract Background Data from metabolomic studies are typically complex and high-dimensional. Principal component analysis (PCA) is currently the most widely used statistical technique for analyzing metabolomic data. However, PCA is limited by the fact that it is not based on a statistical model. Results Here, probabilistic principal component analysis (PPCA) which addresses some of the limitations of PCA, is reviewed and extended. A novel extension of PPCA, called probabilistic principal component and covariates analysis (PPCCA), is introduced which provides a flexible approach to jointly model metabolomic data and additional covariate information. The use of a mixture of PPCA models for discovering the number of inherent groups in metabolomic data is demonstrated. The jackknife technique is employed to construct confidence intervals for estimated model parameters throughout. The optimal number of principal components is determined through the use of the Bayesian Information Criterion model selection tool, which is modified to address the high dimensionality of the data. Conclusions The methods presented are illustrated through an application to metabolomic data sets. Jointly modeling metabolomic data and covariates was successfully achieved and has the potential to provide deeper insight to the underlying data structure. Examination of confidence intervals for the model parameters, such as loadings, allows for principled and clear interpretation of the underlying data structure. A software package called MetabolAnalyze, freely available through the R statistical software, has been developed to facilitate implementation of the presented methods in the metabolomics field.

  16. Primary School Principals' Experiences with Smartphone Apps

    Science.gov (United States)

    Çakir, Rahman; Aktay, Sayim

    2016-01-01

    Smartphones are not just pieces of hardware, they at same time also dip into software features such as communication systems. The aim of this study is to examine primary school principals' experiences with smart phone applications. Shedding light on this subject means that this research is qualitative. Criterion sampling has been intentionally…

  17. Constructing principals' professional identities through life stories ...

    African Journals Online (AJOL)

    Adopting a humanistic perspective to the study of leadership, I discuss and describe how school principals adapt to their new roles, owing to the new education policies and educational restructuring within the South African Department of Education. The Life History approach was used to collect data from six selected school ...

  18. Women principals' reflections of curriculum management challenges ...

    African Journals Online (AJOL)

    ... to schools. The findings imply a need for greater capacity building amongst principals,as well as further research into continuous curriculum changes in the South African education system. Keywords: Annual National Assessments, management styles, rural primary schools, transformational leadership,women managers ...

  19. Assessment of School Principals' Reassignment Process

    Science.gov (United States)

    Sezgin-Nartgün, Senay; Ekinci, Serkan

    2016-01-01

    This study aimed to identify administrators' views related to the assessment of school principals' reassignment in educational organizations. The study utilized qualitative research design and the study group composed of 8 school administrators selected via simple sampling who were employed in the Bolu central district in 2014-2015 academic year.…

  20. Experimental and principal component analysis of waste ...

    African Journals Online (AJOL)

    The present study is aimed at determining through principal component analysis the most important variables affecting bacterial degradation in ponds. Data were collected from literature. In addition, samples were also collected from the waste stabilization ponds at the University of Nigeria, Nsukka and analyzed to ...

  1. Principal Component Analysis as an Efficient Performance ...

    African Journals Online (AJOL)

    This paper uses the principal component analysis (PCA) to examine the possibility of using few explanatory variables (X's) to explain the variation in Y. It applied PCA to assess the performance of students in Abia State Polytechnic, Aba, Nigeria. This was done by estimating the coefficients of eight explanatory variables in a ...

  2. Secondary School Department Chair Roles: Principal Expectations

    Science.gov (United States)

    Brent, Brian O.; Deangelis, Karen J.; Surash, Barbara M.

    2014-01-01

    The literature on the principalship is extensive, revealing ways in which principals can foster or impede school success. At the same time, another formal secondary school-level position, the department chair, has garnered little scholarly attention. Thus far, the literature offers a limited account of the roles that chairs should or do perform in…

  3. Principal normal indicatrices of closed space curves

    DEFF Research Database (Denmark)

    Røgen, Peter

    1999-01-01

    A theorem due to J. Weiner, which is also proven by B. Solomon, implies that a principal normal indicatrix of a closed space curve with nonvanishing curvature has integrated geodesic curvature zero and contains no subarc with integrated geodesic curvature pi. We prove that the inverse problem alw...

  4. Dealing with Crises: One Principal's Experience.

    Science.gov (United States)

    Foley, Charles F.

    1986-01-01

    The principal of Concord High School (New Hampshire) recounts the 1985-86 school year's four crises--the visits of teacher-astronaut Christa McAuliffe and Secretary of Education William Bennett, the shooting of a former student, and the Challenger space shuttle explosion. The greatest challenge was resuming the normal schedule and fielding media…

  5. Spatial control of groundwater contamination, using principal ...

    Indian Academy of Sciences (India)

    A study on the geochemistry of groundwater was carried out in a river basin of Andhra Pradesh to probe into the spatial controlling processes of groundwater contamination, using principal component analysis (PCA). The PCA transforms the chemical variables, pH, EC, Ca2+, Mg2+, Na+, K+, HCO 3 − , Cl−, SO 4 2 − , NO 3 ...

  6. Principal Connection / Amazon and the Whole Teacher

    Science.gov (United States)

    Hoerr, Thomas R.

    2015-01-01

    A recent controversy over Amazon's culture has strong implications for the whole child approach, and it offers powerful lessons for principals. A significant difference between the culture of so many businesses today and the culture at good schools is that in good schools, the welfare of the employees is very important. Student success is the…

  7. Thinking Styles of Teachers, Principals, and Inspectors

    Science.gov (United States)

    Bastug, Özlem Yesim Özbek; Çelik, Bünyamin

    2014-01-01

    Much of current studies focus on the investigation of the thinking styles of students and teachers. However, exploring school administrators' and inpectors' thinking styles is also critical for increasing students' achievement at school. For that purpose, this study was performed to determine the thinking styles of teachers, principals, and…

  8. The Gender of Secondary School Principals.

    Science.gov (United States)

    Bonuso, Carl; Shakeshaft, Charol

    1983-01-01

    A study was conducted to understand why so few of the secondary school principals in New York State are women. Results suggest two possible causes: either sufficient women candidates do not apply for the positions, or sex discrimination still exists. (KH)

  9. Building Blocks for the New Principal

    Science.gov (United States)

    Beckerman, Leon

    2005-01-01

    After all of the theories, strategies, discussions, and classes are completed, new principals often still feel isolated and think they have to reinvent the wheel to learn the basic lessons of leadership--how to improve school climate, how to provide leadership for change, how to communicate effectively, and how to manage time. However, they do not…

  10. A Principal's Guide to Children's Allergies.

    Science.gov (United States)

    Munoz-Furlong, Anne

    1999-01-01

    Discusses several common children's allergies, including allergic rhinitis, asthma, atopic dermatitis, food allergies, and anaphylactic shock. Principals should become familiar with various medications and should work with children's parents and physicians to determine how to manage their allergies at school. Allergen avoidance is the best…

  11. Principal component analysis of psoriasis lesions images

    DEFF Research Database (Denmark)

    Maletti, Gabriela Mariel; Ersbøll, Bjarne Kjær

    2003-01-01

    A set of RGB images of psoriasis lesions is used. By visual examination of these images, there seem to be no common pattern that could be used to find and align the lesions within and between sessions. It is expected that the principal components of the original images could be useful during future...

  12. Great Schools Have Great Principals: Link Crew

    Science.gov (United States)

    Roberts, Rebecca

    2013-01-01

    The author describes the Link Crew transition program that she implemented in 2012 as assistant principal for curriculum and guidance at Villa Park High School in California. She states that administrative and counseling teams at her school had noticed that ninth-grade students struggled in their transitions to high school, with over half of the…

  13. Principals' Transformational Leadership in School Improvement

    Science.gov (United States)

    Yang, Yingxiu

    2013-01-01

    Purpose: This paper aims to contribute experience and ideas of the transformational leadership, not only for the principal want to improve leadership himself (herself), but also for the school at critical period of improvement, through summarizing forming process and the problem during the course and key factors that affect the course.…

  14. Relationship Between Secondary School Principals' Leadership ...

    African Journals Online (AJOL)

    Significant relationship also existed between autocratic leadership style and teachers' job performance (r =-314,N = 300, P<.01). Considering the findings of this study, it was recommended that school principals should imbibe a mixture of autocratic and democratic styles of leadership in their school administration in order to ...

  15. Principal normal indicatrices of closed space curves

    DEFF Research Database (Denmark)

    Røgen, Peter

    1997-01-01

    A theorem due to J. Weiner, which also is proven by B. Solomon, implies that a principal normal indicatrix of a closed space curve with non-vanishing curvature has integrated geodesic curvature zero and contains no sub arc with integrated geodesic curvature Pi. We prove that the inverse problem...

  16. The Relationship between Principals' Managerial Approaches and ...

    African Journals Online (AJOL)

    Students' discipline is critical to the attainment of positive school outcomes. This paper presents and discusses findings of a study on the relationship between principals' management approaches and the level of student discipline in selected public secondary schools in Kenya. The premise of the study was that the level of ...

  17. Principal component analysis implementation in Java

    Science.gov (United States)

    Wójtowicz, Sebastian; Belka, Radosław; Sławiński, Tomasz; Parian, Mahnaz

    2015-09-01

    In this paper we show how PCA (Principal Component Analysis) method can be implemented using Java programming language. We consider using PCA algorithm especially in analysed data obtained from Raman spectroscopy measurements, but other applications of developed software should also be possible. Our goal is to create a general purpose PCA application, ready to run on every platform which is supported by Java.

  18. Principals' Leadership Styles and Student Achievement

    Science.gov (United States)

    Harnish, David Alan

    2012-01-01

    Many schools struggle to meet No Child Left Behind's stringent adequate yearly progress standards, although the benchmark has stimulated national creativity and reform. The purpose of this study was to explore teacher perceptions of principals' leadership styles, curriculum reform, and student achievement to ascertain possible factors to improve…

  19. Islamitisch financieren tussen principes en realiteit

    NARCIS (Netherlands)

    Wolters, W.G.

    2009-01-01

    ‘De financiële crisis zou niet hebben plaatsgevonden, als de wereld de principes van islamitisch bankieren en financieren zou hebben aangenomen.’ Dat was één van de kenmerkende reacties van de kant van de islamitische bankiers, in de laatste maanden van 2008. Toen begon de wereldwijde financiële

  20. What Principals Should Know About Food Allergies.

    Science.gov (United States)

    Munoz-Furlong, Anne

    2002-01-01

    Describes what principals should know about recent research findings on food allergies (peanuts, tree nuts, milk, eggs, soy, wheat) that can produce severe or life-threatening reactions in children. Asserts that every school should have trained staff and written procedures for reacting quickly to allergic reactions. (PKP)

  1. Stochastic convex sparse principal component analysis.

    Science.gov (United States)

    Baytas, Inci M; Lin, Kaixiang; Wang, Fei; Jain, Anil K; Zhou, Jiayu

    2016-12-01

    Principal component analysis (PCA) is a dimensionality reduction and data analysis tool commonly used in many areas. The main idea of PCA is to represent high-dimensional data with a few representative components that capture most of the variance present in the data. However, there is an obvious disadvantage of traditional PCA when it is applied to analyze data where interpretability is important. In applications, where the features have some physical meanings, we lose the ability to interpret the principal components extracted by conventional PCA because each principal component is a linear combination of all the original features. For this reason, sparse PCA has been proposed to improve the interpretability of traditional PCA by introducing sparsity to the loading vectors of principal components. The sparse PCA can be formulated as an ℓ 1 regularized optimization problem, which can be solved by proximal gradient methods. However, these methods do not scale well because computation of the exact gradient is generally required at each iteration. Stochastic gradient framework addresses this challenge by computing an expected gradient at each iteration. Nevertheless, stochastic approaches typically have low convergence rates due to the high variance. In this paper, we propose a convex sparse principal component analysis (Cvx-SPCA), which leverages a proximal variance reduced stochastic scheme to achieve a geometric convergence rate. We further show that the convergence analysis can be significantly simplified by using a weak condition which allows a broader class of objectives to be applied. The efficiency and effectiveness of the proposed method are demonstrated on a large-scale electronic medical record cohort.

  2. Petits planteurs et construction territoriale en Afrique noire : quels enjeux pour les cultures pérennes ?

    Directory of Open Access Journals (Sweden)

    Charlery De La Masseliere Bernard

    2001-11-01

    Full Text Available Les termes de référence de cette conférence ont rappelé l’importance majeure des cultures pérennes pour de nombreux pays en développement. Cette importance n’est pas seulement économique. Elle prend son sens au sein de l’évolution d’un système global où les exigences écologiques de la plante ainsi que les aptitudes bio-climatiques et pédologiques des milieux tropicaux interfèrent avec les conditions historiques du marché mondial, de la formation de sociétés paysannes ouvertes à l’innovation et de la destruction/reconstruction de l’État. Le mouvement d’introduction et de développement des cultures pérennes peut être considéré comme une véritable innovation, voire un fait de civilisation, inscrit dans une longue durée et dont on peut repérer les moments et lieux de l’intégration. Histoire souvent décrite, selon les pays, comme plus ou moins exemplaire, ayant apporté des transformations irréversibles de la société, jusqu’à produire des modèles spécifiques, comme au Kenya le modèle du « petit producteur capitaliste » de la Province centrale, des identités individuelles, à travers le statut de « planteur » comme en Côte d’Ivoire, ou des identités collectives, à travers la proclamation ethnique, comme en pays Bamileke. Réfléchir aujourd’hui sur l’avenir des cultures pérennes dans un contexte de crise nous place bien au cœur des temporalités, complexes, qui animent les éléments du système. François Ruf a bien montré pour le cacao comment la conjonction de facteurs fait passer une région de production, souvent en un très court laps de temps, de l’âge d’or à la crise, comment le transfert spatial des foyers de production vers de nouvelles régions, par une sorte d’accumulation extensive à l’échelle mondiale, a d’une certaine façon occulté, à l’échelle locale ou régionale, les principes élémentaires qui déterminent le cycle de l’innovation. Faut

  3. Enjeux de la propriété littéraire dans les espaces publics et privés

    Directory of Open Access Journals (Sweden)

    André Derval

    2014-11-01

    programme du prochain workshop à Trinité (The politics of location, Jens Boel a rappelé les enjeux du projet Memory of the World (Unesco.

  4. PCA: Principal Component Analysis for spectra modeling

    Science.gov (United States)

    Hurley, Peter D.; Oliver, Seb; Farrah, Duncan; Wang, Lingyu; Efstathiou, Andreas

    2012-07-01

    The mid-infrared spectra of ultraluminous infrared galaxies (ULIRGs) contain a variety of spectral features that can be used as diagnostics to characterize the spectra. However, such diagnostics are biased by our prior prejudices on the origin of the features. Moreover, by using only part of the spectrum they do not utilize the full information content of the spectra. Blind statistical techniques such as principal component analysis (PCA) consider the whole spectrum, find correlated features and separate them out into distinct components. This code, written in IDL, classifies principal components of IRS spectra to define a new classification scheme using 5D Gaussian mixtures modelling. The five PCs and average spectra for the four classifications to classify objects are made available with the code.

  5. A Genealogical Interpretation of Principal Components Analysis

    Science.gov (United States)

    McVean, Gil

    2009-01-01

    Principal components analysis, PCA, is a statistical method commonly used in population genetics to identify structure in the distribution of genetic variation across geographical location and ethnic background. However, while the method is often used to inform about historical demographic processes, little is known about the relationship between fundamental demographic parameters and the projection of samples onto the primary axes. Here I show that for SNP data the projection of samples onto the principal components can be obtained directly from considering the average coalescent times between pairs of haploid genomes. The result provides a framework for interpreting PCA projections in terms of underlying processes, including migration, geographical isolation, and admixture. I also demonstrate a link between PCA and Wright's fst and show that SNP ascertainment has a largely simple and predictable effect on the projection of samples. Using examples from human genetics, I discuss the application of these results to empirical data and the implications for inference. PMID:19834557

  6. Principal component analysis applied to remote sensing

    Directory of Open Access Journals (Sweden)

    Javier Estornell

    2013-06-01

    Full Text Available The main objective of this article was to show an application of principal component analysis (PCA which is used in two science degrees. Particularly, PCA analysis was used to obtain information of the land cover from satellite images. Three Landsat images were selected from two areas which were located in the municipalities of Gandia and Vallat, both in the Valencia province (Spain. In the first study area, just one Landsat image of the 2005 year was used. In the second study area, two Landsat images were used taken in the 1994 and 2000 years to analyse the most significant changes in the land cover. According to the results, the second principal component of the Gandia area image allowed detecting the presence of vegetation. The same component in the Vallat area allowed detecting a forestry area affected by a forest fire. Consequently in this study we confirmed the feasibility of using PCA in remote sensing to extract land use information.

  7. COPD phenotype description using principal components analysis

    DEFF Research Database (Denmark)

    Roy, Kay; Smith, Jacky; Kolsum, Umme

    2009-01-01

    BACKGROUND: Airway inflammation in COPD can be measured using biomarkers such as induced sputum and Fe(NO). This study set out to explore the heterogeneity of COPD using biomarkers of airway and systemic inflammation and pulmonary function by principal components analysis (PCA). SUBJECTS...... AND METHODS: In 127 COPD patients (mean FEV1 61%), pulmonary function, Fe(NO), plasma CRP and TNF-alpha, sputum differential cell counts and sputum IL8 (pg/ml) were measured. Principal components analysis as well as multivariate analysis was performed. RESULTS: PCA identified four main components (% variance...... associations between the variables within components 1 and 2. CONCLUSION: COPD is a multi dimensional disease. Unrelated components of disease were identified, including neutrophilic airway inflammation which was associated with systemic inflammation, and sputum eosinophils which were related to increased Fe...

  8. Principal bundles on the projective line

    Indian Academy of Sciences (India)

    M. Senthilkumar (Newgen Imaging) 1461 1996 Oct 15 13:05:22

    LetX be a complete nonsingular curve over the algebraic closurek ofk andGa reductive group over k. Let E → X be a principal G-bundle on X. E is said to be semistable if, for every reduction of structure group EP ⊂ E to a maximal parabolic subgroup P of G, we have degree EP (p) ≤ 0, where p is the Lie algebra of P and EP ...

  9. Principal bundles on the projective line

    Indian Academy of Sciences (India)

    M. Senthilkumar (Newgen Imaging) 1461 1996 Oct 15 13:05:22

    E-mail: vikram@math.tifr.res.in; subramnn@math.tifr.res.in. MS received 21 January 2002; revised 19 April 2002. Abstract. We classify principal G-bundles on the projective line over an arbitrary field k of characteristic = 2 or 3, where G is a reductive group. If such a bundle is trivial at a k-rational point, then the structure group ...

  10. Principal Component Analysis of Anhui Agricultural Industrialization

    OpenAIRE

    Chen, Li

    2011-01-01

    Part 1: Simulation, Optimization, Monitoring and Control Technology; International audience; This paper is discussed the Anhui agricultural industrialization using the method of principal component analysis. The indexes include per capita net income of farmers in Anhui province, non-agricultural employment rate, urbanization rate, the total power of agricultural mechanization, universal ratio of rural water, car villages, the proportion of industrial waste water by sewage treatment in total e...

  11. Multilevel sparse functional principal component analysis.

    Science.gov (United States)

    Di, Chongzhi; Crainiceanu, Ciprian M; Jank, Wolfgang S

    2014-01-29

    We consider analysis of sparsely sampled multilevel functional data, where the basic observational unit is a function and data have a natural hierarchy of basic units. An example is when functions are recorded at multiple visits for each subject. Multilevel functional principal component analysis (MFPCA; Di et al. 2009) was proposed for such data when functions are densely recorded. Here we consider the case when functions are sparsely sampled and may contain only a few observations per function. We exploit the multilevel structure of covariance operators and achieve data reduction by principal component decompositions at both between and within subject levels. We address inherent methodological differences in the sparse sampling context to: 1) estimate the covariance operators; 2) estimate the functional principal component scores; 3) predict the underlying curves. Through simulations the proposed method is able to discover dominating modes of variations and reconstruct underlying curves well even in sparse settings. Our approach is illustrated by two applications, the Sleep Heart Health Study and eBay auctions.

  12. A principal components model of soundscape perception.

    Science.gov (United States)

    Axelsson, Östen; Nilsson, Mats E; Berglund, Birgitta

    2010-11-01

    There is a need for a model that identifies underlying dimensions of soundscape perception, and which may guide measurement and improvement of soundscape quality. With the purpose to develop such a model, a listening experiment was conducted. One hundred listeners measured 50 excerpts of binaural recordings of urban outdoor soundscapes on 116 attribute scales. The average attribute scale values were subjected to principal components analysis, resulting in three components: Pleasantness, eventfulness, and familiarity, explaining 50, 18 and 6% of the total variance, respectively. The principal-component scores were correlated with physical soundscape properties, including categories of dominant sounds and acoustic variables. Soundscape excerpts dominated by technological sounds were found to be unpleasant, whereas soundscape excerpts dominated by natural sounds were pleasant, and soundscape excerpts dominated by human sounds were eventful. These relationships remained after controlling for the overall soundscape loudness (Zwicker's N(10)), which shows that 'informational' properties are substantial contributors to the perception of soundscape. The proposed principal components model provides a framework for future soundscape research and practice. In particular, it suggests which basic dimensions are necessary to measure, how to measure them by a defined set of attribute scales, and how to promote high-quality soundscapes.

  13. Principal Investigator-in-a-Box

    Science.gov (United States)

    Young, Laurence R.

    1999-01-01

    Human performance in orbit is currently limited by several factors beyond the intrinsic awkwardness of motor control in weightlessness. Cognitive functioning can be affected by such factors as cumulative sleep loss, stress and the psychological effects of long-duration small-group isolation. When an astronaut operates a scientific experiment, the performance decrement associated with such factors can lead to lost or poor quality data and even the total loss of a scientific objective, at great cost to the sponsors and to the dismay of the Principal Investigator. In long-duration flights, as anticipated on the International Space Station and on any planetary exploration, the experimental model is further complicated by long delays between training and experiment, and the large number of experiments each crew member must perform. Although no documented studies have been published on the subject, astronauts report that an unusually large number of simple errors are made in space. Whether a result of the effects of microgravity, accumulated fatigue, stress or other factors, this pattern of increased error supports the need for a computerized decision-making aid for astronauts performing experiments. Artificial intelligence and expert systems might serve as powerful tools for assisting experiments in space. Those conducting space experiments typically need assistance exactly when the planned checklist does not apply. Expert systems, which use bits of human knowledge and human methods to respond appropriately to unusual situations, have a flexibility that is highly desirable in circumstances where an invariably predictable course of action/response does not exist. Frequently the human expert on the ground is unavailable, lacking the latest information, or not consulted by the astronaut conducting the experiment. In response to these issues, we have developed "Principal Investigator-in-a-Box," or [PI], to capture the reasoning process of the real expert, the Principal

  14. Negligence--When Is the Principal Liable? A Legal Memorandum.

    Science.gov (United States)

    Stern, Ralph D., Ed.

    Negligence, a tort liability, is defined, discussed, and reviewed in relation to several court decisions involving school principals. The history of liability suits against school principals suggests that a reasonable, prudent principal can avoid legal problems. Ten guidelines are presented to assist principals in avoiding charges of negligence.…

  15. The Interdependence of Principal School Leadership and Student Achievement

    Science.gov (United States)

    Soehner, David; Ryan, Thomas

    2011-01-01

    This review illuminated principal school leadership as a variable that impacted achievement. The principal as school leader and manager was explored because these roles were thought to impact student achievement both directly and indirectly. Specific principal leadership behaviors and principal effectiveness were explored as variables potentially…

  16. Principals' perceptions of the motivation potential of performance ...

    African Journals Online (AJOL)

    The article explores the proposed performance agreement and its potential influence on principals' motivation to improve their own, and therefore also the teachers' and learners' academic performance. The focus group interviews conducted with principals and deputy principals indicate that principals do not want to be held ...

  17. Management Of Indiscipline Among Teachers By Principals Of ...

    African Journals Online (AJOL)

    This study compared the management of indiscipline among teachers by public and private school principals in Akwa Ibom State. The sample comprised four hundred and fifty (450) principals/vice principals randomly selected from a population of one thousand, four hundred and twenty eight (1,428) principals. The null ...

  18. 21 CFR 701.10 - Principal display panel.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 7 2010-04-01 2010-04-01 false Principal display panel. 701.10 Section 701.10...) COSMETICS COSMETIC LABELING Package Form § 701.10 Principal display panel. The term principal display panel... for retail sale. The principal display panel shall be large enough to accommodate all the mandatory...

  19. Do Qualification, Experience and Age Matter for Principals Leadership Styles?

    OpenAIRE

    Muhammad Javed Sawati; Saeed Anwar; Muhammad Iqbal Majoka

    2013-01-01

    The main focus of present study was to find out the prevalent leadership styles of principals in government schools of Khyber Pakhtunkhwa and to find relationship of leadership styles with qualifications, age and experience of the principals. On the basis of analyzed data, four major leadership styles of the principals were identified as Eclectic, Democratic, Autocratic, and Free-rein. However, a small proportion of the principal had no dominant leadership style. This study shows that princip...

  20. Trust Me, Principal, or Burn Out! The Relationship between Principals' Burnout and Trust in Students and Parents

    Science.gov (United States)

    Ozer, Niyazi

    2013-01-01

    The purpose of this study was to determine the primary school principals' views on trust in students and parents and also, to explore the relationships between principals' levels of professional burnout and their trust in students and parents. To this end, Principal Trust Survey and Friedman Principal Burnout scales were administered on 119…

  1. A Study of the Perceptions of Performance Skills of Middle School Principals by Selected Teachers and Principals.

    Science.gov (United States)

    Meyer, Calvin F.; Van Hoose, John J.

    This study investigates hypotheses about differences in the perceptions of middle school principals and teachers concerning those principal performance skills that are practiced and those that should be practiced. A survey instrument consisting of 37 principal performance skills on a five-point Likert-like scale was sent to the principals and…

  2. Thermal energy of nuclear origin produced in non-fissile materials (1962); Energie calorifique d'origine nucleaire degagee dans les materiaux non fissiles (1962)

    Energy Technology Data Exchange (ETDEWEB)

    Naudet, G. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires; Millies, P.; Berger, J. [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1962-07-01

    A first part is devoted to the description of the interaction phenomena between elementary particles and material that may be observed during the irradiation process in a nuclear reactor: nuclear reactions due to neutrons, production of gamma rays and absorption of those gamma rays through various processes. In a second part the phenomena producing calorific energy in irradiated material are quantitatively examined. In the third part results are summed up in a formulary. The fourth part presents tables and figures giving to the reader all the numerical values necessary for practical calculations. (authors) [French] Une premiere partie est consacree a l'examen des principaux phenomenes d'interaction des particules avec la matiere qui interviennent lors d'une irradiation dans un reacteur: reactions nucleaires dues aux neutrons, production des rayons gamma et absorption de ces derniers par les divers processus. Une deuxieme partie etudie quantitativement les phenomenes qui conduisent a l'apparition d'energie calorifique dans le materiau irradie. En troisieme partie, un formulaire resume les resultats etablis. Dans une quatrieme partie, des tableaux et des courbes fournissent a l'experimentateur toutes les valeurs numeriques necessaires aux calculs pratiques. (auteurs)

  3. Principal-value resummation for dilepton production

    International Nuclear Information System (INIS)

    Contopanagos, H.; Alvero, L.; Sterman, G.

    1994-01-01

    We present a new method of resummation of QCD threshold distributions to the hard scattering function of the dilepton production cross section in hadron-hadron collisions. Our formulation by-passes the infrared singularities of the QCD running coupling through a principal value prescription, and does not require an explicit infrared cut-off. The resulting large corrections exponentiate, and we discuss asymptotic properties of the exponent. We present a closed analytical formula for the resummed hard part in momentum space, and give predictions, at fixed-target energies, for the resulting cross section which is a bounded function of its kinematic variables in the entire partonic phase space

  4. Kernel principal component analysis for change detection

    DEFF Research Database (Denmark)

    Nielsen, Allan Aasbjerg; Morton, J.C.

    2008-01-01

    Principal component analysis (PCA) is often used to detect change over time in remotely sensed images. A commonly used technique consists of finding the projections along the two eigenvectors for data consisting of two variables which represent the same spectral band covering the same geographical...... region acquired at two different time points. If change over time does not dominate the scene, the projection of the original two bands onto the second eigenvector will show change over time. In this paper a kernel version of PCA is used to carry out the analysis. Unlike ordinary PCA, kernel PCA...

  5. Batailles professionnelles et enjeux politiques

    Directory of Open Access Journals (Sweden)

    Éric Gobe

    2014-05-01

    Full Text Available Les batailles territoriales que se sont livrées experts comptables et avocats sous le régime de Ben Ali montrent que, dans un contexte autoritaire, les logiques professionnelles et celles du politique sont intimement imbriquées. L’État tunisien a arbitré entre différents intérêts professionnels en fonction des nécessités de la pérennisation du régime autoritaire. Les rapports de force politique entre les différents acteurs, i.e. les gouvernants, le barreau, les experts comptables et les autres professions du chiffre, ont contribué au découpage d’un territoire professionnel perçu comme défavorable par des avocats eux-mêmes appréhendés par le pouvoir comme une profession dangereuse. La « révolution » tunisienne de 2011 a inversé provisoirement les rapports de force en faveur du barreau qui a su tirer parti de la chute du président Ben Ali pour faire aboutir ses revendications et réasseoir son pouvoir professionnel.

  6. Influence of Intermediate Principal Stress on Undrained Behavior of Intact Clay under Pure Principal Stress Rotation

    Directory of Open Access Journals (Sweden)

    Jian Zhou

    2013-01-01

    Full Text Available This study presents the accumulations of the excess pore water pressure and the deformation as well as the noncoaxial behavior of intact soft clay subjected to pure principal stress rotation. Series of tests were carried out by using a dynamic hollow cylinder apparatus to highlight the influence of intermediate principal stress parameter b. It was found that the rate of PWP evolution was greatly influenced by b, but the influence was not monotonous. Specimens under the condition b = 0.75 had the highest accumulation of pore water pressure while under the condition b = 0 had the strongest resistance to the pore pressure generation. PWP accumulated mainly in the first cycle. The failure of specimens under principal stress rotation was controlled by the strain other than the pore pressure. The shear stiffness decreased more quickly with higher b value. The direction of the principal strain increment was strongly dependent on the principal stress increment orientation and less influenced by the b value and the number of cycles.

  7. Integrating Data Transformation in Principal Components Analysis

    KAUST Repository

    Maadooliat, Mehdi

    2015-01-02

    Principal component analysis (PCA) is a popular dimension reduction method to reduce the complexity and obtain the informative aspects of high-dimensional datasets. When the data distribution is skewed, data transformation is commonly used prior to applying PCA. Such transformation is usually obtained from previous studies, prior knowledge, or trial-and-error. In this work, we develop a model-based method that integrates data transformation in PCA and finds an appropriate data transformation using the maximum profile likelihood. Extensions of the method to handle functional data and missing values are also developed. Several numerical algorithms are provided for efficient computation. The proposed method is illustrated using simulated and real-world data examples.

  8. Reinvention and the Principal-Agent Model

    Directory of Open Access Journals (Sweden)

    J. Ramón Gil García

    2003-01-01

    Full Text Available Existe una interesante polémica en el sector público, derivada de las tensiones existentes entre desempeño y flexibilidad administrativa por un lado, y rendición de cuentas y control, por el otro. El propósito de este artículo es discutir la utilidad del modelo agente principal para un mejor entendimiento de las tensiones entre desempeño y rendición de cuentas, así como analizar las similitudes y contradicciones de esta perspectiva teórica en comparación con el movimiento de “reinvención del gobierno” de la década de los noventa en Estados Unidos.

  9. Nonlinear principal component analysis and its applications

    CERN Document Server

    Mori, Yuichi; Makino, Naomichi

    2016-01-01

    This book expounds the principle and related applications of nonlinear principal component analysis (PCA), which is useful method to analyze mixed measurement levels data. In the part dealing with the principle, after a brief introduction of ordinary PCA, a PCA for categorical data (nominal and ordinal) is introduced as nonlinear PCA, in which an optimal scaling technique is used to quantify the categorical variables. The alternating least squares (ALS) is the main algorithm in the method. Multiple correspondence analysis (MCA), a special case of nonlinear PCA, is also introduced. All formulations in these methods are integrated in the same manner as matrix operations. Because any measurement levels data can be treated consistently as numerical data and ALS is a very powerful tool for estimations, the methods can be utilized in a variety of fields such as biometrics, econometrics, psychometrics, and sociology. In the applications part of the book, four applications are introduced: variable selection for mixed...

  10. Principals and the Human Condition: Reflections of an Elementary School Principal.

    Science.gov (United States)

    Latimer, Milree H.

    Educational leaders must be perceived to act consistently and with integrity. When leaders are conscious of beliefs and values, they will act spontaneously in a consistent manner, and their actions, embedded in their beliefs, will have an underlying harmony. School principals must embrace the concept of empowerment and dignity of the individual…

  11. The Networked Principal: Examining Principals' Social Relationships and Transformational Leadership in School and District Networks

    Science.gov (United States)

    Moolenaar, Nienke M.; Sleegers, Peter J. C.

    2015-01-01

    Purpose: While in everyday practice, school leaders are often involved in social relationships with a variety of stakeholders both within and outside their own schools, studies on school leaders' networks often focus either on networks within or outside schools. The purpose of this paper is to investigate the extent to which principals occupy…

  12. Principals' and Teachers' Views of Spirituality in Principal Leadership in Three Primary Schools

    Science.gov (United States)

    Gibson, Alaster

    2014-01-01

    This article discusses key findings from my doctoral research involving a qualitative case study inquiring into the lived experiences of spirituality in principal leadership and its influence on teachers and their teaching within three public primary school contexts in New Zealand. Spirituality is understood in this article as a complex and…

  13. 10 CFR 609.13 - Principal and interest assistance contract.

    Science.gov (United States)

    2010-01-01

    ... THAT EMPLOY INNOVATIVE TECHNOLOGIES § 609.13 Principal and interest assistance contract. With respect... appropriated for that purpose, the principal and interest charges that become due and payable on the unpaid...

  14. Nuclear wastes; Dechets nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-07-01

    Here is made a general survey of the situation relative to radioactive wastes. The different kinds of radioactive wastes and the different way to store them are detailed. A comparative evaluation of the situation in France and in the world is made. The case of transport of radioactive wastes is tackled. (N.C.)

  15. Nuclear energy; Le nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-01

    This digest document was written by members of the union of associations of ex-members and retired people of the Areva group (UARGA). It gives a comprehensive overview of the nuclear industry world, starting from radioactivity and its applications, and going on with the fuel cycle (front-end, back-end, fuel reprocessing, transports), the nuclear reactors (PWR, BWR, Candu, HTR, generation 4 systems), the effluents from nuclear facilities, the nuclear wastes (processing, disposal), and the management and safety of nuclear activities. (J.S.)

  16. The Principal's Perceptions of School Libraries and Teacher-Librarians.

    Science.gov (United States)

    Hartzell, Gary

    2002-01-01

    Discusses principals' inaccurate perceptions of school library media programs and teacher-librarians. Topics include the invisibility of media specialists; isolation and scheduling; a low profile in professional literature read by principals; occupational socialization; principals' experiences as K-12 students; teacher training; administrator…

  17. Principal Selection: A National Study of Selection Criteria and Procedures

    Science.gov (United States)

    Palmer, Brandon

    2017-01-01

    Despite empirical evidence correlating the role of the principal with student achievement, researchers have seldom scrutinized principal selection methods over the past 60 years. This mixed methods study investigated the processes by which school principals are selected. A national sample of top-level school district administrators was used to…

  18. How Professional Standards Guide Practice for School Principals

    Science.gov (United States)

    Militello, Matthew; Fusarelli, Bonnie; Alsbury, Thomas; Warren, Thomas P.

    2013-01-01

    Purpose: The purpose of this study is to provide an empirical measure of how principals enact prescribed leadership standards into practice. The aim of the study was to ascertain how current school principals perceive the practice of a specific set of leadership standards. Design/methodology/approach: A total of 61 practicing school principals in…

  19. Principals' Experiences of Being Evaluated: A Phenomenological Study

    Science.gov (United States)

    Parylo, Oksana; Zepeda, Sally J.; Bengtson, Ed

    2012-01-01

    This phenomenological study sought to understand principals' lived experiences of being evaluated with reliance on the principles of developmental supervision and adult learning theory. Analysis of interview data from 16 principals revealed 3 major constructs in principal evaluation: evaluation is a complex, constantly changing system; principal…

  20. Perception of principals and teachers of the external supervisors ...

    African Journals Online (AJOL)

    The study investigated the perception of principals and teachers of external supervisors' role in secondary schools in Ogun State. Two versions of a questionnaire titled “Questionnaire on the role of external supervisors as perceived by principals and teachers” designed by the researcher were administered on 40 principals ...

  1. Job Satisfaction of Elementary Principals in Large Urban Communities

    Science.gov (United States)

    Mitchell, Cathryn M.

    2010-01-01

    The purpose of this study was to determine job satisfaction levels of elementary principals in "major urban" districts in Texas and to identify strategies these principals used to cope with the demands of the position. Additionally, the project sought to find structures and supports needed to attract and retain principals in the…

  2. Contemporary Challenges and Changes: Principals' Leadership Practices in Malaysia

    Science.gov (United States)

    Jones, Michelle; Adams, Donnie; Joo, Mabel Tan Hwee; Muniandy, Vasu; Perera, Corinne Jaqueline; Harris, Alma

    2015-01-01

    This article outlines the findings from a contemporary study of principals' leadership practices in Malaysia as part of the 7 System Leadership Study. Recent policy developments within Malaysia have increased principals' accountability and have underlined the importance of the role of the principals in transforming school performance and student…

  3. Principal Leadership for Technology-enhanced Learning in Science

    Science.gov (United States)

    Gerard, Libby F.; Bowyer, Jane B.; Linn, Marcia C.

    2008-02-01

    Reforms such as technology-enhanced instruction require principal leadership. Yet, many principals report that they need help to guide implementation of science and technology reforms. We identify strategies for helping principals provide this leadership. A two-phase design is employed. In the first phase we elicit principals' varied ideas about the Technology-enhanced Learning in Science (TELS) curriculum materials being implemented by teachers in their schools, and in the second phase we engage principals in a leadership workshop designed based on the ideas they generated. Analysis uses an emergent coding scheme to categorize principals' ideas, and a knowledge integration framework to capture the development of these ideas. The analysis suggests that principals frame their thinking about the implementation of TELS in terms of: principal leadership, curriculum, educational policy, teacher learning, student outcomes and financial resources. They seek to improve their own knowledge to support this reform. The principals organize their ideas around individual school goals and current political issues. Principals prefer professional development activities that engage them in reviewing curricula and student work with other principals. Based on the analysis, this study offers guidelines for creating learning opportunities that enhance principals' leadership abilities in technology and science reform.

  4. Common Core Implementation Decisions Made by Principals in Elementary Schools

    Science.gov (United States)

    Norman, Alexis Cienfuegos

    2016-01-01

    The purpose of this study was to understand the decisions elementary principals have made during the Common Core State Standards reform. Specifically, (a) what decisions principals have made to support Common Core implementation, (b) what strategies elementary principals have employed to communicate with stakeholders about Common Core State…

  5. FY15 Sao Tome and Principe Country Opinion Survey Report

    OpenAIRE

    World Bank Group

    2016-01-01

    The Country Opinion Survey in Sao Tome and Principe assists the World Bank Group (WBG) in gaining a better understanding of how stakeholders in Sao Tome and Principe perceive the WBG. It provides the WBG with systematic feedback from national and local governments, multilateral/bilateral agencies, media, academia, the private sector, and civil society in Sao Tome and Principe on 1) their v...

  6. The Development of Assistant Principals: A Literature Review

    Science.gov (United States)

    Oleszewski, Ashley; Shoho, Alan; Barnett, Bruce

    2012-01-01

    Purpose: The purpose of this review is to add to the discussion of assistant principals (APs), a position that has been under-represented in the professional literature. Design/methodology/approach: An extensive search was undertaken on assistant principals, vice principals, and deputy head teachers from various sources, including journals,…

  7. School Performance Trajectories and the Challenges for Principal Succession

    Science.gov (United States)

    Lee, Linda C.

    2015-01-01

    Purpose: The purpose of this paper is to use empirical data on new principals to clarify the connection between different succession situations and the challenges their successor principals face. Design/methodology/approach: The study draws on two waves of interview data from a random sample of 16 new elementary school principals in a major urban…

  8. The Principal Report: The State of School Leadership in Illinois

    Science.gov (United States)

    White, Bradford R.; Agarwal, Pooja K.

    2011-01-01

    Although principals play a vital role as school leaders, exactly how principal leadership affects student learning is only beginning to be understood. In fact, only a few states have analyzed basic profile data on their principals--their demographics, education, and prior experience before leading a school. Most states also have yet to examine how…

  9. Entry Strategies of First-Time High School Principals.

    Science.gov (United States)

    Hall, Gene E.; Mani, M. N. G.

    To determine the first things that a new principal does during the first few months on the job, an intensive case study was conducted of 12 first-time high school principals in Florida, Virginia, Missouri, and Colorado. Each beginning principal was assigned a research team member who conducted on-site visits, reviewed documentation regarding the…

  10. Principals' Perceptions of Instructional Stages Based on Felt Teaching Characteristics.

    Science.gov (United States)

    DeMoulin, Donald F.; Guyton, John W.

    Whether principals could identify teaching traits and categorize these consistently as descriptors of instructional stages was studied by asking 145 randomly selected principals in public schools throughout Illinois and Indiana to characterize teacher behavior based on experience. Principals were asked to list instructional stages, yielding 161…

  11. 21 CFR 801.60 - Principal display panel.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Principal display panel. 801.60 Section 801.60... panel. The term principal display panel, as it applies to over-the-counter devices in package form and..., or examined under customary conditions of display for retail sale. The principal display panel shall...

  12. 21 CFR 201.60 - Principal display panel.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 4 2010-04-01 2010-04-01 false Principal display panel. 201.60 Section 201.60...: GENERAL LABELING Labeling Requirements for Over-the-Counter Drugs § 201.60 Principal display panel. The term principal display panel, as it applies to over-the-counter drugs in package form and as used in...

  13. Taking a Distributed Perspective to the School Principal's Workday

    Science.gov (United States)

    Spillane, James P.; Camburn, Eric M.; Pareja, Amber Stitziel

    2007-01-01

    Focusing on the school principal's day-to-day work, we examine who leads curriculum and instruction- and administration-related activities when the school principal is not leading but participating in the activity. We also explore the prevalence of coperformance of management and leadership activities in the school principal's workday. Looking…

  14. Use of Sparse Principal Component Analysis (SPCA) for Fault Detection

    DEFF Research Database (Denmark)

    Gajjar, Shriram; Kulahci, Murat; Palazoglu, Ahmet

    2016-01-01

    Principal component analysis (PCA) has been widely used for data dimension reduction and process fault detection. However, interpreting the principal components and the outcomes of PCA-based monitoring techniques is a challenging task since each principal component is a linear combination of the ...

  15. Taḥyâ as-sînamâ ! Produire du sens : les enjeux politiques de l’expression dans l’espace public

    Directory of Open Access Journals (Sweden)

    Cécile Boëx

    2012-02-01

    Full Text Available Cet article propose d’identifier les enjeux politiques de l’expression dans l’espace public en Syrie et plus spécifiquement ceux relatifs à l’expression artistique, au prisme du dernier festival de cinéma de Damas, événement catalyseur mais aussi réceptacle des différentes formes de la politisation de la culture. Cet angle d’approche nous permet de mettre en lumière les tentatives d’un régime autoritaire pour contrôler la production du sens et imposer ses interprétations des événements. Ce contexte n’a cependant nullement empêché l’existence de pratiques expressives polymorphes, voire contestataires, rendues possibles par diverses stratégies de contournement, de mises à distance, dont nous donnons des exemples dans des registres différents : les dernières mobilisations patriotiques anti-Mehlis et l’expression cinématographique qui a eu un rôle précurseur dans la publicisation de remises en question de la référence politique dominante.

  16. Principal component analysis for fermionic critical points

    Science.gov (United States)

    Costa, Natanael C.; Hu, Wenjian; Bai, Z. J.; Scalettar, Richard T.; Singh, Rajiv R. P.

    2017-11-01

    We use determinant quantum Monte Carlo (DQMC), in combination with the principal component analysis (PCA) approach to unsupervised learning, to extract information about phase transitions in several of the most fundamental Hamiltonians describing strongly correlated materials. We first explore the zero-temperature antiferromagnet to singlet transition in the periodic Anderson model, the Mott insulating transition in the Hubbard model on a honeycomb lattice, and the magnetic transition in the 1/6-filled Lieb lattice. We then discuss the prospects for learning finite temperature superconducting transitions in the attractive Hubbard model, for which there is no sign problem. Finally, we investigate finite temperature charge density wave (CDW) transitions in the Holstein model, where the electrons are coupled to phonon degrees of freedom, and carry out a finite size scaling analysis to determine Tc. We examine the different behaviors associated with Hubbard-Stratonovich auxiliary field configurations on both the entire space-time lattice and on a single imaginary time slice, or other quantities, such as equal-time Green's and pair-pair correlation functions.

  17. Record of principal work activities/deliverables

    International Nuclear Information System (INIS)

    1989-09-01

    Over the five year period of performance, thirteen task assignments were issued by the DOE to ARINC Research. During the two year base period seven tasks were assigned. Two task assignments were issued for each of the three consecutive one year option periods. Associated with all task assignments were multiple subtasks, some of which required significant effort. These subtasks are appropriately cited in this report under their respective task assignments as principal work activities or deliverables. The technical and management support provided to the DOE under this contract focused on two general areas: (1) appraisal activities and (2) non-appraisal activities. Support to appraisals included planning, document review, developing lines-of-inquiry, interviewing, data collection, report writing, and follow-up. Such work was executed both on-site at the DOE facility under review and off-site. Non-appraisal support was varied and included such areas as document review, data base development, technical assessments. statistical analysis, policy analysis, reliability engineering, and workshop and conference planning and execution

  18. Automatic Subspace Learning via Principal Coefficients Embedding.

    Science.gov (United States)

    Peng, Xi; Lu, Jiwen; Yi, Zhang; Yan, Rui

    2017-11-01

    In this paper, we address two challenging problems in unsupervised subspace learning: 1) how to automatically identify the feature dimension of the learned subspace (i.e., automatic subspace learning) and 2) how to learn the underlying subspace in the presence of Gaussian noise (i.e., robust subspace learning). We show that these two problems can be simultaneously solved by proposing a new method [(called principal coefficients embedding (PCE)]. For a given data set , PCE recovers a clean data set from and simultaneously learns a global reconstruction relation of . By preserving into an -dimensional space, the proposed method obtains a projection matrix that can capture the latent manifold structure of , where is automatically determined by the rank of with theoretical guarantees. PCE has three advantages: 1) it can automatically determine the feature dimension even though data are sampled from a union of multiple linear subspaces in presence of the Gaussian noise; 2) although the objective function of PCE only considers the Gaussian noise, experimental results show that it is robust to the non-Gaussian noise (e.g., random pixel corruption) and real disguises; and 3) our method has a closed-form solution and can be calculated very fast. Extensive experimental results show the superiority of PCE on a range of databases with respect to the classification accuracy, robustness, and efficiency.

  19. Subjective performance evaluations and reciprocity in principal-agent relations

    DEFF Research Database (Denmark)

    Sebald, Alexander Christopher; Walzl, Markus

    2014-01-01

    . In contrast to existing models of reciprocity, we find that agents tend to sanction whenever the feedback of principals is below their subjective self-evaluations even if agents' pay-offs are independent of it. In turn, principals provide more positive feedback (relative to their actual performance assessment......We conduct a laboratory experiment with agents working on, and principals benefiting from, a real effort task in which the agents' performance can only be evaluated subjectively. Principals give subjective performance feedback to agents, and agents have an opportunity to sanction principals...

  20. New features of nuclear excitation by {alpha} particles scattering; Nouveaux aspects de l'excitation nucleaire par diffusion de particules {alpha}

    Energy Technology Data Exchange (ETDEWEB)

    Saudinos, J. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1962-07-01

    Inelastic scattering of medium energy a particles by nuclei is known to excite preferentially levels of collective character. We have studied the scattering of isotopically enriched targets of Ca, Fe, Ni, Cu, Zn. In part I, we discuss the theoretical features of the interaction. In part II, we describe the experimental procedure. Results are presented and analysed in part III. {alpha} particles scattering by Ca{sup 40} is showed to excite preferentially odd parity levels. In odd nuclei we have observed multiplets due to the coupling of the odd nucleon with the even-even core vibrations. For even-even nuclei, a few levels are excited with lower cross-sections between the well-known first 2{sup +} and 3{sup -} states. Some could be members of the two phonon quadrupole excitation and involve a double nuclear excitation process. (author) [French] On sait que la diffusion inelastique des particules alpha de moyenne energie excite preferentiellement des niveaux de caractere collectif. Nous avons etudie la diffusion des particules alpha de 44 MeV du cyclotron de Saclay par des isotopes separes de Ca, Fe, Ni, Cu, Zn. Dans la premiere partie nous exposons les theories de cette interaction. Dans la seconde nous decrivons le systeme experimental. Les resultats sont donnes dans la troisieme partie. Nous montrons que les niveaux excites preferentiellement pour {sup 40}Ca par diffusion ({alpha},{alpha}') sont de parite negative. Dans les noyaux pair-impair nous avons observe des multiplets dus au couplage du nucleon celibataire avec les vibrations du coeur pair-pair. Pour les noyaux pair-pair nous avons pu etudier entre le premier niveau 2{sup +} et le niveau 3{sup -} deja bien connus certains etats plus faiblement excites. Il semble qu'ils sont dus a une excitation quadrupolaire a deux phonons et impliquent un processus de double excitation nucleaire. (auteur)

  1. Perceptions of the Principal Evaluation Process and Performance Criteria: A Qualitative Study of the Challenge of Principal Evaluation

    Science.gov (United States)

    Faginski-Stark, Erica; Casavant, Christopher; Collins, William; McCandless, Jason; Tencza, Marilyn

    2012-01-01

    Recent federal and state mandates have tasked school systems to move beyond principal evaluation as a bureaucratic function and to re-imagine it as a critical component to improve principal performance and compel school renewal. This qualitative study investigated the district leaders' and principals' perceptions of the performance evaluation…

  2. Health problems raised by the elimination of radioactive wastes and nuclear accidents; Problemes sanitaires poses par l'elimination des dechets radioactifs et par les accidents nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    Jammet, H.; Mechali, D.; Dousset, M. [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1964-07-01

    The rapid development of nuclear energy demands an urgent solution to the health problems arising from the discharge into the environment of radioactive residues produced by nuclear installations. - To be able to evaluate the risks run by the population and to fix tolerance limits for waste discharge, it is necessary to possess an exact knowledge of the course taken by the radioelements discharged, from their source until they reach man. The incorporation of radioelements in food cycles is the first risk to take into consideration. The factors involved in all stages of this transmission must be foreseen, whether they concern physical or biological media, because of their continuity and their interdependence. Finally, socio-economic and dietetic data must be collected in order that the risks and tolerance levels estimated are based on concrete and experimental rather than theoretical knowledge. The risk of nuclear accidents in the atomic industry, although very improbable, must be taken into consideration because of the seriousness of their consequences. The health problems arise in the field of professional hygiene on the one hand and in that of public hygiene on the other. In the first field the risk is two-fold and involves irradiation and contamination. The public sphere is reduced essentially to the risk of contamination by radioactive substances accidentally released in the surrounding medium. The health studies to be conducted in this field therefore include research not only on irradiation or contamination therapeutics but also on the transfer of radioelements from the accident site to man, mainly through food cycles, in their physical and in their biological components. Studies of this kind form the basis of decisions in the health field which would have to be taken in the case of an accident. (authors) [French] Le developpement rapide de l'energie nucleaire rend urgente la solution des problemes sanitaires poses par le rejet dans le milieu ambiant des

  3. Mapping ash properties using principal components analysis

    Science.gov (United States)

    Pereira, Paulo; Brevik, Eric; Cerda, Artemi; Ubeda, Xavier; Novara, Agata; Francos, Marcos; Rodrigo-Comino, Jesus; Bogunovic, Igor; Khaledian, Yones

    2017-04-01

    In post-fire environments ash has important benefits for soils, such as protection and source of nutrients, crucial for vegetation recuperation (Jordan et al., 2016; Pereira et al., 2015a; 2016a,b). The thickness and distribution of ash are fundamental aspects for soil protection (Cerdà and Doerr, 2008; Pereira et al., 2015b) and the severity at which was produced is important for the type and amount of elements that is released in soil solution (Bodi et al., 2014). Ash is very mobile material, and it is important were it will be deposited. Until the first rainfalls are is very mobile. After it, bind in the soil surface and is harder to erode. Mapping ash properties in the immediate period after fire is complex, since it is constantly moving (Pereira et al., 2015b). However, is an important task, since according the amount and type of ash produced we can identify the degree of soil protection and the nutrients that will be dissolved. The objective of this work is to apply to map ash properties (CaCO3, pH, and select extractable elements) using a principal component analysis (PCA) in the immediate period after the fire. Four days after the fire we established a grid in a 9x27 m area and took ash samples every 3 meters for a total of 40 sampling points (Pereira et al., 2017). The PCA identified 5 different factors. Factor 1 identified high loadings in electrical conductivity, calcium, and magnesium and negative with aluminum and iron, while Factor 3 had high positive loadings in total phosphorous and silica. Factor 3 showed high positive loadings in sodium and potassium, factor 4 high negative loadings in CaCO3 and pH, and factor 5 high loadings in sodium and potassium. The experimental variograms of the extracted factors showed that the Gaussian model was the most precise to model factor 1, the linear to model factor 2 and the wave hole effect to model factor 3, 4 and 5. The maps produced confirm the patternd observed in the experimental variograms. Factor 1 and 2

  4. Principal spectra describing magnetooptic permittivity tensor in cubic crystals

    Energy Technology Data Exchange (ETDEWEB)

    Hamrlová, Jana [Nanotechnology Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); IT4Innovations Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); Legut, Dominik [IT4Innovations Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); Veis, Martin [Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, Prague, 121 16 Czech Republic (Czech Republic); Pištora, Jaromír [Nanotechnology Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); Hamrle, Jaroslav, E-mail: jaroslav.hamrle@vsb.cz [IT4Innovations Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, Prague, 121 16 Czech Republic (Czech Republic); Department of Physics, VSB – Technical University of Ostrava, 17. listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic)

    2016-12-15

    We provide unified phenomenological description of magnetooptic effects being linear and quadratic in magnetization. The description is based on few principal spectra, describing elements of permittivity tensor up to the second order in magnetization. Each permittivity tensor element for any magnetization direction and any sample surface orientation is simply determined by weighted summation of the principal spectra, where weights are given by crystallographic and magnetization orientations. The number of principal spectra depends on the symmetry of the crystal. In cubic crystals owning point symmetry we need only four principal spectra. Here, the principal spectra are expressed by ab initio calculations for bcc Fe, fcc Co and fcc Ni in optical range as well as in hard and soft x-ray energy range, i.e. at the 2p- and 3p-edges. We also express principal spectra analytically using modified Kubo formula.

  5. Preliminary Test Estimation for Multi-Sample Principal Components

    OpenAIRE

    Paindaveine, Davy; Rasoafaraniaina, Rondrotiana J; Verdebout, Thomas

    2016-01-01

    In this paper, we consider point estimation in a multi-sample principal components setup, in a situation where it is suspected that the hypothesis of common principal components (CPC) holds. We propose preliminary test estimators of the various principal eigenvectors. We derive their asymptotic distributions (i) under the CPC hypothesis, (ii) under sequences of hypotheses that are contiguous to the CPC hypothesis, and (iii) away from the CPC hypothesis. We conduct a Monte-Carlo study that sho...

  6. Computing Cumulative Interest and Principal Paid For a Calendar Year

    OpenAIRE

    John O. MASON

    2011-01-01

    This paper demonstrates how easy it is use Microsoft Excel’s CUMPRINC and CUMIPMT functions to compute principal and interest paid for an entire year, even though the payments were made monthly. The CUMPRINC function computes the principal paid by a series of loan payments; the CUMIPMT function computes the interest paid. These two functions provide an alternative to preparing a monthly loan amortization schedule and adding up the amounts of monthly interest paid and principal paid for the ye...

  7. Improvement of pressure-vessel surveillance of a PWR-power plant of the Societe d'Energie Nucleaire Franco-Belge des Ardennes (S.E.N.A.)

    International Nuclear Information System (INIS)

    Bevilacqua, A.; Lloret, R.; Riehl, R.

    1984-01-01

    This paper describes a new dosimetry, installed inside and outside the Pressure Vessel of CHOOZ Nuclear Power Plant of the Societe d'Energie Nucleaire Franco-Belge des Ardennes (S.E.N.A.), during its 1982-83 operation cycle. The inner dosimetry deals with a simulated capsule located under the reactor plate, and includes copper, nickel, iron, niobium, copper-cobalt, neptunium and uranium dosimeters. Its aim is to qualify the information given by the existing copper dosimetry. The spectrum used with these measurements is obtained by the 1 D ANISN Code and BIP-N 2 library. The outer dosimety is the fluence determination along the outer wall of the vessel. Two tubes, equiped by neutron dosimeters, seven meters long, were fixed along the vessel. On the median plane, the results are compared to a 2 D DOT transport calculation. Preliminary results are given which improve the vessel and specimens neutronic characterisation. (Auth.)

  8. Incremental Tensor Principal Component Analysis for Handwritten Digit Recognition

    Directory of Open Access Journals (Sweden)

    Chang Liu

    2014-01-01

    Full Text Available To overcome the shortcomings of traditional dimensionality reduction algorithms, incremental tensor principal component analysis (ITPCA based on updated-SVD technique algorithm is proposed in this paper. This paper proves the relationship between PCA, 2DPCA, MPCA, and the graph embedding framework theoretically and derives the incremental learning procedure to add single sample and multiple samples in detail. The experiments on handwritten digit recognition have demonstrated that ITPCA has achieved better recognition performance than that of vector-based principal component analysis (PCA, incremental principal component analysis (IPCA, and multilinear principal component analysis (MPCA algorithms. At the same time, ITPCA also has lower time and space complexity.

  9. La qualité des plages au cœur des enjeux de développement : La situation des îles de l’océan Indien

    Directory of Open Access Journals (Sweden)

    Virginie Duvat

    2009-02-01

    Full Text Available La qualité des plages s’inscrit au cœur des enjeux de développement des petites îles tropicales en raison d’une part, de la place qu’elle occupe dans les stratégies de promotion touristique, et d’autre part, de l’importance que prend le littoral dans les pratiques récréatives et touristiques émergentes des populations locales. Dans ce contexte, l’objectif de cet article est de présenter les résultats d’une évaluation réalisée dans différentes îles des archipels des Seychelles et des Mascareignes, et de mettre en évidence la relation qui existe entre la qualité des plages, leurs attributs naturels et les politiques d’aménagement et de gestion des acteurs publics et privés.Today, the quality of the tropical beaches is closely linked to development challenges for two main reasons. At first, because sandy beaches play an important role in tourism development policies, and secondly because of the emergence of the touristic and recreative activities of the local communities. In this context, the purpose of this paper is to expose the results of an assessment which was done in the Seychelles and Mascarene islands and to highlight the relationship which can be observed between beach quality, natural assets and the strategies of public and private actors.

  10. Construire une conception scientifique du vivant avec des élèves de 5-7 ans : approche didactique pour mieux comprendre les processus d’apprentissage et les enjeux développementaux

    Directory of Open Access Journals (Sweden)

    Grancher Céline

    2015-01-01

    Full Text Available Cet article s’intéresse au vivant en tant qu’objet de savoir et aux phénomènes d’enseignement-apprentissage de ce concept au début de l’école primaire en France (élèves de 5-7 ans, classes de CP-CE1. Nous nous interrogeons sur les contenus à enseigner et les situations possibles à mettre en oeuvre dans les classes pour que des élèves construisent une conception scientifique du vivant. Nous délimitons d’abord le concept de vivant dans une perspective d’enseignement à de jeunes élèves. Puis nous identifions un des enjeux de l’enseignement-apprentissage du vivant : permettre aux élèves de construire un autre rapport au vivant que celui de la vie de tous les jours. Nous abordons les situations scolaires comme des processus d’acculturation scientifique scolaire. Les élèves sont en effet incités à entrer dans une culture scientifique en s’appropriant à la fois des savoirs relatifs au vivant et des pratiques de la biologie. À partir de deux séquences d’enseignement réalisées en CP puis en CE1 avec les mêmes élèves, nous repérons des indicateurs qui témoignent de la construction d’une conception scientifique du vivant par les élèves. Nous montrons également que les processus d’acculturation scientifique dans lesquels les élèves sont engagés ont des effets sur leur développement.

  11. Preschool Principal's Curriculum Leadership Indicators: A Taiwan Perspective

    Science.gov (United States)

    Lin, Chia-Fen; Lee, John Chi-Kin

    2013-01-01

    The role of a principal's curriculum leadership has become an educational issue in Taiwan's early childhood education. This study represents a pioneering attempt in adopting a target school interview, fuzzy Delphi, and analytic hierarchy process for constructing preschool principal's curriculum leadership indicators. Fifteen experts and…

  12. Invisible Barriers: The Loneliness of School Principals at Turkish ...

    African Journals Online (AJOL)

    Psychological insight is the notion that all participants agreed on and emphasised when asked to offer a definition of loneliness at schools. Participants also agreed on the fact that the organisational climate at Turkish schools represented the most significant reason for principals' loneliness at work. The school principals that ...

  13. Principals' and Teachers' Attitudes towards Inclusion in Israel

    Science.gov (United States)

    Hess, Itay; Zamir, Sara

    2016-01-01

    The main goal of this study was to determine whether, in schools that practice inclusion, there is a correlation between the attitudes of school principals and teachers in their schools, towards inclusion of student with special needs. For this purpose, 38 schools were sampled in each of which the school principal and five teachers who work with…

  14. Identifying and Addressing Themes of Job Dissatisfaction for Secondary Principals

    Science.gov (United States)

    De Jong, David; Grundmeyer, Trent; Yankey, Julie

    2017-01-01

    Secondary principals serve in important roles that are complex, high-stress, and include demanding job responsibilities. Key stakeholders such as superintendents, school board members, and legislators must understand the challenges facing secondary principals in order to address the current themes of job dissatisfaction. Using new survey data…

  15. A Review of Singapore Principals' Leadership Qualities, Styles, and Roles

    Science.gov (United States)

    Ng, David Foo Seong; Nguyen, Dong Thanh; Wong, Benjamin Koon Siak; Choy, William Kim Weng

    2015-01-01

    Purpose: The purpose of this paper is to present a review of empirical studies on principal leadership in Singapore. It seeks to provide a general picture of Singapore principals' leadership qualities, styles, and roles. Design/methodology/approach: This is a systematic review of empirical studies, using a "bounded" approach with a focus…

  16. The Relationship of Principal Conflict Management Style and School Climate

    Science.gov (United States)

    Boucher, Miriam Miley

    2013-01-01

    Using a mixed-methods design, this study examined conflict management styles of elementary school principals in South Carolina and the relationship of conflict management style and school climate. The Rahim Organizational Conflict Inventory-II, Form B, which identifies five styles of managing conflict, was used to determine principal conflict…

  17. Principal Component Analysis: Most Favourite Tool in Chemometrics

    Indian Academy of Sciences (India)

    Data compression by. PCA involves finding a new space spanned by fewer number of dimensions over which original data set is projected. The dimensions of the ... The variable that ex- plains the maximum variation is called the first principal compo- nent. Second principal component explains the second highest variation ...

  18. Principal Preparation Matters: How Leadership Development Affects Student Achievement. Brief

    Science.gov (United States)

    Gates, Susan M.; Hamilton, Laura S.; Martorell, Paco; Burkhauser, Susan; Heaton, Paul; Pierson, Ashley; Baird, Matthew D.; Vuollo, Mirka; Li, Jennifer J.; Lavery, Diana; Harvey, Melody; Gu, Kun

    2014-01-01

    In 2006, New Leaders contracted with RAND to conduct an independent evaluation of its principal-preparation program. The analysis included all principals who have been prepared by New Leaders since the inception of the program, comparing outcomes of their students and outcomes of similar students in other, comparable schools in the same districts.…

  19. Location and characterisation of pollution sites by principal ...

    African Journals Online (AJOL)

    Location and characterisation of pollution sites by principal component analysis of trace contaminants in a slightly polluted seasonal river: a case study of the Arenales River (Salta, Argentina) ... Keywords: trace element contamination, water quality, principal component analysis, Arenales River, Salta, Argentina ...

  20. Principals' Perception of Educational Inputs and Students' Academic ...

    African Journals Online (AJOL)

    This study investigated principals' perception of the relationship between educational inputs and academic performance of students in public junior secondary schools (JSS) in the Central Senatorial District of Delta State, Nigeria. The population was all the 173 public JSS and their principals from which a sample of twenty ...

  1. Are Teacher and Principal Candidates Prepared to Address Student Cyberbullying?

    Science.gov (United States)

    Styron, Ronald A., Jr.; Bonner, Jessica L.; Styron, Jennifer L.; Bridgeforth, James; Martin, Cecelia

    2016-01-01

    The purpose of this study was to examine the preparation of teacher and principal candidates to address problems created in K-12 settings as a result of cyberbullying. Participants included teacher and principal preparation students. Findings indicated that respondents were familiar with the most common forms of cyberbullying and its impact on…

  2. Comments: Should Principal Stratification Be Used to Study Mediational Processes?

    Science.gov (United States)

    VanderWeele, Tyler J.

    2012-01-01

    Principal stratification provides an approach to study the effect of an exposure on an outcome within strata defined by the effect of the exposure on some third, posttreatment, variable (Frangakis & Rubin, 2002). There has been more recent interest in using principal stratification to study the extent to which the effect of an exposure on an…

  3. Leading with Heart: Urban Elementary Principals as Advocates for Students

    Science.gov (United States)

    Rodriguez, Mariela A.; Murakami-Ramalho, Elizabeth; Ruff, William G.

    2009-01-01

    Principals in urban settings serve elementary schools often densely populated with highly mobile, ethnically diverse, and economically disadvantaged students. Due to the changing landscape of increasing accountability issues required by the "No Child Left Behind Act (NCLB)" (2001), principals must adjust the mission of the school…

  4. Latina/o School Principals: Identity, Leadership and Advocacy

    Science.gov (United States)

    Murakami, Elizabeth T.; Hernandez, Frank; Mendez-Morse, Sylvia; Byrne-Jimenez, Monica

    2016-01-01

    This study sought to further define and inform about the influence of Latina/o principals in schools as an alternative to traditional forms of leadership. The principals' Latina/o identity, their leadership styles and advocacy towards the improvement of student achievement were examined. This research focused on three questions: (a) How did…

  5. "Mujeres" in the Principal's Office: Latina School Leaders

    Science.gov (United States)

    Méndez-Morse, Sylvia; Murakami, Elizabeth T.; Byrne-Jiménez, Mónica; Hernandez, Frank

    2015-01-01

    This article is based on a national survey of Latina/o principals and assistant principals conducted by the National Latina/o Leadership Project and focuses on the women participants. Included is a description of Latinas' leadership experiences, their career paths, and the influence of racial/ethnic identity on their leadership practice. The…

  6. The Forgotten Aspect of Communication: Principals' Listening Skills

    Science.gov (United States)

    Woods, Jerry; Shoho, Alan R.

    2009-01-01

    This study investigated principals' self-perceptions and teachers' perceptions of principals' listening skills. An instrument measuring perception of listening skills was developed on the basis of four listening factors: attending, empathy, response, and trustworthiness. Factor analysis confirmed the structure of the new listening instrument, and…

  7. Principal curves for identifying outsiders in experimental tests with calorimeters

    CERN Document Server

    Da Silva, P V M

    2003-01-01

    Principal curves are used for particle discrimination. They are developed for application in calibration tests of the hadronic calorimeter (Tilecal) of the ATLAS detector. Defining principal curves for electrons, pions and muons, a discrimination efficiency better than 92.4% can be achieved, even when high particle contamination is observed in the experimental data sets.

  8. 3D face recognition with asymptotic cones based principal curvatures

    KAUST Repository

    Tang, Yinhang

    2015-05-01

    The classical curvatures of smooth surfaces (Gaussian, mean and principal curvatures) have been widely used in 3D face recognition (FR). However, facial surfaces resulting from 3D sensors are discrete meshes. In this paper, we present a general framework and define three principal curvatures on discrete surfaces for the purpose of 3D FR. These principal curvatures are derived from the construction of asymptotic cones associated to any Borel subset of the discrete surface. They describe the local geometry of the underlying mesh. First two of them correspond to the classical principal curvatures in the smooth case. We isolate the third principal curvature that carries out meaningful geometric shape information. The three principal curvatures in different Borel subsets scales give multi-scale local facial surface descriptors. We combine the proposed principal curvatures with the LNP-based facial descriptor and SRC for recognition. The identification and verification experiments demonstrate the practicability and accuracy of the third principal curvature and the fusion of multi-scale Borel subset descriptors on 3D face from FRGC v2.0.

  9. Discretion in Student Discipline: Insight into Elementary Principals' Decision Making

    Science.gov (United States)

    Findlay, Nora M.

    2015-01-01

    Little research exists that examines the exercise of discretion by principals in their disciplinary decision making. This study sought to understand the application of values by principals as they engage in student disciplinary decision making within legally fixed parameters of their administrative discretion. This qualitative methodology used…

  10. Process Knowledge Discovery Using Sparse Principal Component Analysis

    DEFF Research Database (Denmark)

    Gao, Huihui; Gajjar, Shriram; Kulahci, Murat

    2016-01-01

    have been an active area of research. Among the methods used, principal component analysis (PCA) is a well-established technique that allows for dimensionality reduction for large data sets by finding new uncorrelated variables, namely principal components (PCs). However, it is difficult to interpret...

  11. Principals' Perceptions of Their Knowledge in Special Education

    Science.gov (United States)

    Roberts, Maria Banda; Guerra, Federico R., Jr.

    2017-01-01

    With the "Every Student Succeeds Act" continuing to legislate accountability for special education and Hispanic students, the appropriate content in principal preparation programs relevant to successful leadership of special education programs is vital. This mixed methods study analyzed the survey responses of 84 principals in South…

  12. Principals' Perceptions of Needs in Hispanic Special Education

    Science.gov (United States)

    Roberts, Maria B.; Guerra, Federico, Jr.

    2017-01-01

    This mixed methods study used a survey by Frost and Kersten to answer the following questions: (a) Do principals of predominantly Hispanic schools perceive themselves as having adequate knowledge in special education? (b) Which areas are these principals most involved in with special education teachers? (c) What suggestions do these principals…

  13. High School Principals and the High School Journalism Program.

    Science.gov (United States)

    Peterson, Jane W.

    A study asked selected high school principals to respond to statements about the value of high school journalism to the high school student and about the rights and responsibilities of the high school journalist. These responses were then checked against such information as whether or not the high school principal had worked on a high school…

  14. Relationship between Implicit Leadership and Proactive Behaviors of School Principals

    Science.gov (United States)

    Keskinkilic-Kara, Sultan-Bilge; Zafer-Gunes, Demet

    2017-01-01

    The aim of this research is to define the school principals' implicit leadership theory and to reveal its relationship with the proactive behavior. The study is conducted in Bagcilar and Basaksehir districts in Istanbul and the target population of the research is 153 school principals working in state elementary schools, middle schools and high…

  15. An Introductory Application of Principal Components to Cricket Data

    Science.gov (United States)

    Manage, Ananda B. W.; Scariano, Stephen M.

    2013-01-01

    Principal Component Analysis is widely used in applied multivariate data analysis, and this article shows how to motivate student interest in this topic using cricket sports data. Here, principal component analysis is successfully used to rank the cricket batsmen and bowlers who played in the 2012 Indian Premier League (IPL) competition. In…

  16. From Redistribution to Recognition: How School Principals Perceive Social Justice

    Science.gov (United States)

    Wang, Fei

    2016-01-01

    Where there are people, there is social in/justice. Using Nancy Fraser's framework, this qualitative research examines how school principals perceive social justice in schools. Twenty-one elementary and secondary school principals were interviewed in the Greater Toronto Area. The study provides some empirical evidence on the ways social…

  17. School Principals' Technology Leadership Competency and Technology Coordinatorship

    Science.gov (United States)

    Banoglu, Koksal

    2011-01-01

    The aim of this study is to determine the primary and high school principals' competency in technology leadership and so to define implications for advanced competency. The population of the study was formed by 134 school principals in Maltepe and Kadikoy districts in Istanbul. On account of the fact that population was reachable, no specific…

  18. Teacher Contract Non-Renewal: What Matters to Principals?

    Science.gov (United States)

    Nixon, Andy; Packard, Abbot; Dam, Margaret

    2016-01-01

    This quantitative study investigated the relationship between teacher dispositions, subject content knowledge, pedagogical content knowledge, and reasons that school principals recommend non-renewal of teachers' contracts. Nearly 2,000 school principals in 13 states completed an emailed survey. In deciding whether to non-renew a teacher contract,…

  19. Empowering principals to lead and manage public schools ...

    African Journals Online (AJOL)

    Globally, education systems have been affected by radical social, political and economic changes. Although school principals play a pivotal role in improving student learning and attaining educational outcomes, they work under strenuous conditions to deal with multifaceted transformational issues. Principals experience ...

  20. Exploratory principal components analysis of growth traits in Red ...

    African Journals Online (AJOL)

    Exploratory principal components analysis of growth traits in Red Sokoto goats. ... Similar prediction pattern is obtained for CWT. ... similarity of intercepts of regression equations and those of average values for growth traits in this study indicated the possibility of improvement of goat stocks through the principal components.

  1. Financial accountability: the principal or the school governing body ...

    African Journals Online (AJOL)

    The Schools Act 84 of 1996 prescribes how a school should manage its funds. It also provides guidelines for the school governing body and the principal on their roles and responsibilities in managing the finances of the school. However, there are school governing bodies and principals that have little knowledge of the ...

  2. Perceptions of Women Principals' Leadership and Teachers' Work Attitudes.

    Science.gov (United States)

    Shum, Lai Ching; Cheng, Yin Cheong

    1997-01-01

    Investigates the relationship between perceptions of women principals' leadership (regarding sex-role orientation and leadership functions) and teachers' work attitudes (regarding sense of efficacy, community, and professional interest) in a sample of teachers supervised by women principals in Hong Kong secondary schools. Findings do show…

  3. Dynamic Leadership Succession: Strengthening Urban Principal Succession Planning

    Science.gov (United States)

    Peters-Hawkins, April L.; Reed, Latish C.; Kingsberry, Francemise

    2018-01-01

    The Dynamic Leadership Succession model is used to analyze a leadership succession case in an urban school district. The qualitative findings show that the district did not forecast school leadership needs well; however, the principal sought to develop and mentor teacher leaders as her assistant principals. Second, sustaining efforts within the…

  4. High School Principals as Leaders: Styles and Sources of Power

    Science.gov (United States)

    Brinia, Vasiliki; Papantoniou, Eva

    2016-01-01

    Purpose: The purpose of this paper is to present the characteristics of leadership (style adopted, sources of power exercised and factors affecting leadership) of high school principals in Greece. Design/Methodology/Approach: In total, 235 school principals were surveyed using questionnaires. These questionnaires assessed how often they adopted…

  5. 26 CFR 1.446-3 - Notional principal contracts.

    Science.gov (United States)

    2010-04-01

    ... maturity and annual compounding at 10%, M and N account for the principal and interest on the loan as.... Notional principal contracts governed by this section include interest rate swaps, currency swaps, basis swaps, interest rate caps, interest rate floors, commodity swaps, equity swaps, equity index swaps, and...

  6. 24 CFR 206.211 - Annual determination of principal residence.

    Science.gov (United States)

    2010-04-01

    ... residence. 206.211 Section 206.211 Housing and Urban Development Regulations Relating to Housing and Urban... determination of principal residence. At least once during each calendar year, the mortgagee shall determine whether or not the property is the principal residence of at least one mortgagor. The mortgagee shall...

  7. Principal Concerns: Iowa May Face Statewide Demand. Data Brief

    Science.gov (United States)

    DeArmond, Michael; Ouijdani, Monica

    2012-01-01

    When people talk about human capital or talent in public education, they generally focus on teachers, not principals. That's a mistake. School districts and states generally don't take a strategic approach toward managing their principal workforce. Often, they lack even the most basic information about who is leading their schools: Where do most…

  8. The Development of Faith Leadership in Novice Principals

    Science.gov (United States)

    Rieckhoff, Barbara Stacy

    2014-01-01

    This article describes the Catholic School Principal Support Program (CSPSP), a mentoring program for first and second-year Catholic school principals in a large urban diocese, and identifies key challenges, impacts and influences on decision-making. Ten school leaders describe their work and provide the lens by which they reflect on their role as…

  9. Principal Preservice Education for Leadership in Inclusive Schools

    Science.gov (United States)

    Lyons, Wanda

    2016-01-01

    Principal leadership has been identified as the key to successful implementation of inclusive education for students with disabilities. Prospective principals require knowledge, skills, and dispositions to equip them to work with key stakeholders to initiate and sustain inclusive practices within their schools. The purpose of this action research…

  10. Primary School Principals' Job Satisfaction and Occupational Stress

    Science.gov (United States)

    Darmody, Merike; Smyth, Emer

    2016-01-01

    Purpose: The purpose of this paper is to explore the factors associated with occupational stress and job satisfaction among Irish primary school principals. A principal's job has become increasingly demanding and complex in recent decades. However, there is little current research into their levels of stress and job satisfaction, particularly…

  11. Principals' Beliefs: The Interface of Gender and Sector.

    Science.gov (United States)

    Collard, John L.

    2003-01-01

    A survey of 371 principals and 24 interviews in Victoria, Australia, found significant differences between male and female principals in their leadership styles and their beliefs about the nature of the principalship, educational goals, and professional roles and behaviors. However, level of schooling, institutional scale, students' gender, and…

  12. Examining Teachers' Motivation Level According to School Principals' Humor Styles

    Science.gov (United States)

    Recepoglu, Ergun; Kilinc, Ali Cagatay; Cepni, Osman

    2011-01-01

    The purpose of this research is to examine the motivation level of teachers according to school principals' humor styles. The humor styles survey and job motivation scale were used to gather data from 305 randomly selected teachers employed in primary schools in Karabuk. Results indicated that 141 of the teachers claimed school principal had…

  13. An Investigation of Depression and Loneliness among School Principals

    Science.gov (United States)

    Izgar, Huseyin

    2009-01-01

    This research aimed to investigate whether loneliness predicts depression, and to examine the levels of depression loneliness among school principals according to such variables as gender and educational background. The study was conducted on 232 school principals (37 females and 195 males). Thirty six of the participants had associate degrees,…

  14. Principals' Leadership Styles and ESL Teachers' Job Satisfaction

    Science.gov (United States)

    Jackson, K. A'jaydin

    2013-01-01

    The purpose of this research study was to examine principals' leadership styles and how and what extent it impacted teachers' job satisfaction. Principals' leadership styles were examined by middle and high school teachers' perceptions. This study drew from 10 middle and 10 high schools in a large school district located in Texas. Participants…

  15. On hypersurfaces with two distinct principal curvatures in space forms

    Indian Academy of Sciences (India)

    Abstract. We investigate the immersed hypersurfaces in space forms Nn+1(c), n ≥4 with two distinct non-simple principal curvatures without the assumption that the (high order) mean curvature is constant. We prove that any immersed hypersurface in space forms with two distinct non-simple principal curvatures is locally ...

  16. Calibrating One's Moral Compass: How Principal Preparation Shapes School Leaders

    Science.gov (United States)

    Larsen, Donald E.; Derrington, Mary Lynne

    2012-01-01

    No textbook that an aspiring principal encounters in preparing for the role of school leader discusses what steps to follow when a member--or members--of the school staff challenge standards of professional judgment and moral rectitude. Instead, the most reliable guide at the principal's disposal may be the "moral compass" upon which the…

  17. The Relationship between Principals' Transformational Leadership Behaviors and School Culture

    Science.gov (United States)

    Bolton, David A.

    2011-01-01

    This quantitative study looks at the relationship between a principals' transformational leadership behaviors and the culture of their school. The goal of the study is to determine if transformational leadership qualities have a positive impact on the culture present in a school. Congruency between the views of a principal and their staff will…

  18. Super- and Anti-Principal-Modes in Multimode Waveguides

    Science.gov (United States)

    Ambichl, Philipp; Xiong, Wen; Bromberg, Yaron; Redding, Brandon; Cao, Hui; Rotter, Stefan

    2017-10-01

    We introduce special states for light in multimode waveguides featuring strongly enhanced or reduced spectral correlations in the presence of strong mode coupling. Based on the experimentally measured multispectral transmission matrix of a multimode fiber, we generate a set of states that outperform the established "principal modes" in terms of the spectral stability of their output spatial field profiles. Inverting this concept also allows us to create states with a minimal spectral correlation width, whose output profiles are considerably more sensitive to a frequency change than typical input wave fronts. The resulting "super-principal-modes" and "anti-principal-modes" are made orthogonal to each other even in the presence of mode-dependent loss. By decomposing them in the principal-mode basis, we show that the super-principal-modes are formed via interference of principal modes with close delay times, whereas the anti-principal-modes are a superposition of principal modes with the most-different delay times available in the fiber. Such novel states are expected to have broad applications in fiber communication, imaging, and spectroscopy.

  19. Can-rupture detection in gas-cooled nuclear reactors; La detection des ruptures de gaine dans les piles nucleaires refroidies par gaz

    Energy Technology Data Exchange (ETDEWEB)

    Roguin, A. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1965-07-01

    Can-rupture detection (DRG) is one important aspect of pile safety, more particularly so in the case of gas-cooled reactors. A rapid and sure detection constitutes also an improvement as far as the efficiency of electricity-producing nuclear power stations are concerned. Among the numerous can-rupture detection methods, that based on the measurement of the concentration of short-lived fission gases in the heat-carrying fluid has proved to be the most sensitive and the most rapid. A systematic study of detectors based on the electrostatic collection of the daughter products of fission gases has been undertaken with a view to equip the reactors EL 2, G 3, EDF 1, EDF 2 and EDF 3, the gas loops of PEGASE and EL 4. The different parameters are studied in detail in order to obtain a maximum sensitivity and to make it possible to construct detection devices having the maximum operational reliability and requiring the minimum maintenance. The primary applications of these devices are examined in the case of the above-mentioned reactors. (author) [French] La Detection des Ruptures de Gaines (D. R. G.) est un aspect important de la securite des piles et plus particulierement des piles refroidies par un gaz. Une detection rapide et sure constitue aussi un element d'amelioration du rendement des centrales nucleaires productrices d'energie electrique. Parmi les nombreuses methodes de detection des ruptures de gaines, la mesure de la concentration dans le fluide caloporteur des gaz de fission a vie courte s'est revelee comme la plus sensible et la plus rapide. Une etude systematique des detecteurs a collection electrostatique des descendants des gaz de fission a ete entreprise en vue d'equiper les piles EL 2, G 3, EDF 1, EDF 2 et EDF 3, les boucles a gaz de la pile Pegase et la pile EL 4. Les divers parametres sont etudies en detail pour obtenir une sensibilite maximum et permettre la realisation de dispositifs de detection ayant le maximum de securite de

  20. The Leadership Roles of a Principal in Improving School Effectiveness

    Directory of Open Access Journals (Sweden)

    Burhanuddin Burhanuddin

    2016-02-01

    Full Text Available The purpose of this study was to investigate the leadership roles and practices of the principal in improving school effectiveness. This descriptive study involved the principal , counselor, and 11 teachers from the Tonsley Park Primary School in South Australia. The findings showed that all respondents generally regarded team leader as the most important role, while supervisor was rated as the least important. Of the 20 tasks observed, generally revealed that a principal should work cooperatively with staff to ensure more effective use of their skills. While, the task of a principal in making decisions on staff development programs was not necessarily expected by the practicing teachers. All respondents considered organization coordination as the most important area within which a principal should provide more leadership, while curriculum or instructional improvement and innovation was regarded as the least important

  1. Female Principals in Education: Breaking the Glass Ceiling in Spain

    Directory of Open Access Journals (Sweden)

    Enrique Javier Diez Gutierrez

    Full Text Available Abstract Spanish schools are characterised by having a high proportion of female staff. However, statistics show that a proportionately higher number of men hold leadership positions. The aim of this study was to analyse the reasons why this is so, and to determine the motivations and barriers that women encounter in attaining and exercising these positions of greater responsibility and power. Questionnaires were administered to 2,022 female teachers, 430 female principals and 322 male principals. In addition, semi-structured interviews were held with 60 female principals, 14 focus group discussions were held with female principals and 16 autobiographical narratives were compiled with female principals and school inspectors. The reasons identified were related to structural aspects linked to the patriarchal worldview that is still dominant in our society and culture. Nevertheless, we also found motivations among women for attaining and exercising leadership roles.

  2. Intégration des principes de l'accès au savoir (A2K) aux Principes ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Les Principes directeurs des Nations Unies pour la protection du consommateur ont été adoptés en 1985 afin de formuler un ensemble de normes représentant les pratiques exemplaires en matière de protection du consommateur, en particulier à l'intention des pays en développement. Les Principes directeurs ...

  3. The Effects of Reform in Principal Selection on Leadership Behavior of General and Vocational High School Principals in Taiwan

    Science.gov (United States)

    Hsiao, Hsi-Chi; Lee, Ming-Chao; Tu, Ya-Ling

    2013-01-01

    Deregulation has formed the primary core of education reform in Taiwan in the past decade. The principal selection system was one of the specific recommendations in the deregulation of education. The method of designation of senior high school principals has changed from being "appointed" to being "selected." The issue as to…

  4. "She Made Us Principals": A Case Study of a Female Principal Who Pushed 12 Teachers to Principalship

    Science.gov (United States)

    Barkol, Rina

    2006-01-01

    The aim of this article is to attain insight into the issues of empowerment and motivation in principalship in general and in feminine leadership at schools in particular. It presents a case study of a woman principal who "bred" 12 principals during 12 years of principalship, most of them in her last 5 years on the job, in the middle of…

  5. Principals' Perceived Value of Data and Principals' Perceived Competency of Data Use in a Rural School Division

    Science.gov (United States)

    Phillips, Christopher

    2014-01-01

    Over the last years, principals in schools have had to contend with numerous governmental regulations that change with each passing year. The change from instruction based on concepts to instruction based on standards to instruction based on student performance has created a need for principals to utilize data in ever-increasing forms. Both…

  6. Looked after or Left Behind: The Effectiveness of Principal Preparation Programs as Perceived by Generation Y Principals

    Science.gov (United States)

    Sledge, Chandra

    2013-01-01

    This research study intended to discover the perceptions of 10 Illinois Generation Y novice high school principals pertaining to the effectiveness of their principal preparation programs in terms of how well it prepared them to lead in the first three years of their principalship, and what subsequent professional development they deemed necessary…

  7. COMPETENCE OF SCHOOL PRINCIPALS REGARDING KNOWLEDGE MANAGEMENT IN ELEMENTARY SCHOOLS

    Directory of Open Access Journals (Sweden)

    Gökmen DAĞLI

    2007-12-01

    Full Text Available This research aims to determine the manner of school principals regarding knowledge managementin primary school education. The research is a subjective one conducted in general scanning method. Personal informationform and five-likert scale are the main means in which data was collected. During the data collection stage, school principalswere requested to provide information about the way in which they obtain, share, process, evaluate knowledge, take decisionand analyze problems within the scope of knowledge management. In the virtue of the data acquired, the research shows that;the school principals obtain knowledge by attending meetings with teachers, making personal observation, their personalexperience and online resources. Regarding the sharing of knowledge, the research shows the principals always shareknowledge with their assistant principals and teachers; in using of knowledge, decision making and analyzing problemsresearch also shows that principals take decisions in co-operation with assistant principals and teachers. Last but not least,research shows that in storing the knowledge principals mainly use computers and traditional filing techniques. Seminarsshould be organized periodically by specialists with respect to acquiring, sharing, using and also filling knowledge followingdecision-making in order for school administrators to keep abreast of the latest developments in knowledge management

  8. Principal Components as a Data Reduction and Noise Reduction Technique

    Science.gov (United States)

    Imhoff, M. L.; Campbell, W. J.

    1982-01-01

    The potential of principal components as a pipeline data reduction technique for thematic mapper data was assessed and principal components analysis and its transformation as a noise reduction technique was examined. Two primary factors were considered: (1) how might data reduction and noise reduction using the principal components transformation affect the extraction of accurate spectral classifications; and (2) what are the real savings in terms of computer processing and storage costs of using reduced data over the full 7-band TM complement. An area in central Pennsylvania was chosen for a study area. The image data for the project were collected using the Earth Resources Laboratory's thematic mapper simulator (TMS) instrument.

  9. On hypersurfaces with two distinct principal curvatures in space forms

    Indian Academy of Sciences (India)

    simple principal curvatures is locally conformal to the. Riemannian product of two constant curved manifolds. We also obtain some charac- terizations for the Clifford hypersurfaces in terms of the trace free part of the second fundamental form.

  10. A modified principal component analysis-based utility theory ...

    African Journals Online (AJOL)

    user

    modified PCA-based utility theory (UT) approach for optimization of correlated responses. ... Keywords: EDM; Correlated responses; Optimization; Principal component analysis; Proportion of quality loss reduction; ...... On stochastic optimization: Taguchi MethodsTM demystified; its limitations and fallacy clarified.

  11. A modified principal component analysis-based utility theory ...

    African Journals Online (AJOL)

    traditional machining processes having multiple performance characteristics, some of which are usually correlated. So, ideally, use of principal component analysis (PCA)-based approaches that take into account the possible correlations ...

  12. Rational, Bureaucratic, Collegial, and Political Views of the Principal's Role.

    Science.gov (United States)

    Sergiovanni, Thomas

    1979-01-01

    Understanding of four basic organization management models--the rational model, the mechanistic model, the collegial/organic model, and the political theory/bargaining model--can aid school principals in critically assessing their own administrative styles. (LH)

  13. Principal-vector-directed fringe-tracking technique.

    Science.gov (United States)

    Zhang, Zhihui; Guo, Hongwei

    2014-11-01

    Fringe tracking is one of the most straightforward techniques for analyzing a single fringe pattern. This work presents a principal-vector-directed fringe-tracking technique. It uses Gaussian derivatives for estimating fringe gradients and uses hysteresis thresholding for segmenting singular points, thus improving the principal component analysis method. Using it allows us to estimate the principal vectors of fringes from a pattern with high noise. The fringe-tracking procedure is directed by these principal vectors, so that erroneous results induced by noise and other error-inducing factors are avoided. At the same time, the singular point regions of the fringe pattern are identified automatically. Using them allows us to determine paths through which the "seed" point for each fringe skeleton is easy to find, thus alleviating the computational burden in processing the fringe pattern. The results of a numerical simulation and experiment demonstrate this method to be valid.

  14. Principals' perceptions of the motivation potential of performance ...

    African Journals Online (AJOL)

    Hennie

    influence on principals' motivation to improve their own, and therefore also the teachers' and learners' academic perform- ance. The focus ... Keywords: accountability; motivation; performance agreements; performance management; power; school leadership; underperforming ..... The quotations in this article were chosen ...

  15. The job satisfaction of principals of previously disadvantaged schools

    African Journals Online (AJOL)

    :200). The South African education .... related ideal would determine the principals' morale, motivation and job satisfaction. This conception of an .... scribing these verbatim, and presenting direct quotes from interviews in the results. The results.

  16. Nonparametric inference in nonlinear principal components analysis : exploration and beyond

    NARCIS (Netherlands)

    Linting, Mariëlle

    2007-01-01

    In the social and behavioral sciences, data sets often do not meet the assumptions of traditional analysis methods. Therefore, nonlinear alternatives to traditional methods have been developed. This thesis starts with a didactic discussion of nonlinear principal components analysis (NLPCA),

  17. A Tannakian approach to dimensional reduction of principal bundles

    Science.gov (United States)

    Álvarez-Cónsul, Luis; Biswas, Indranil; García-Prada, Oscar

    2017-08-01

    Let P be a parabolic subgroup of a connected simply connected complex semisimple Lie group G. Given a compact Kähler manifold X, the dimensional reduction of G-equivariant holomorphic vector bundles over X × G / P was carried out in Álvarez-Cónsul and García-Prada (2003). This raises the question of dimensional reduction of holomorphic principal bundles over X × G / P. The method of Álvarez-Cónsul and García-Prada (2003) is special to vector bundles; it does not generalize to principal bundles. In this paper, we adapt to equivariant principal bundles the Tannakian approach of Nori, to describe the dimensional reduction of G-equivariant principal bundles over X × G / P, and to establish a Hitchin-Kobayashi type correspondence. In order to be able to apply the Tannakian theory, we need to assume that X is a complex projective manifold.

  18. L'immunohistochimie: Son principe, ses applications et ses limites ...

    African Journals Online (AJOL)

    L'immunohistochimie: Son principe, ses applications et ses limites. ... Clinics in Mother and Child Health ... Son but et son principe: mettre en évidence certaines protéines cellulaires, qu'elles soient cytoplasmiques, membranaires ou nucléaires, spécifiques pour un type ou une fonction cellulaire, à l'aide d'une réaction ...

  19. African-American Female Students and STEM: Principals' Leadership Perspectives

    Science.gov (United States)

    Sampson, Kristin Morgan

    As the U.S. becomes more diverse, school leaders, major corporations, and areas of national defense continue to investigate science, technology, engineering and math (STEM) education issues. African-American female students have historically been underrepresented in STEM fields, yet educational leadership research, examining this population is limited. The purpose of this qualitative study was to explore how principals support African-American female students in schools with a STEM program. The Critical Race Theory (CRT)was used as a theoretical framework to highlight the inadequacies to support educational inequalities. The application of the CRT in this study is due to the embedded inequality practices within the educational system, that have resulted in the underrepresentation of African-American female students in STEM. To complement CRT, the transformative leadership model was also utilized to examine the emancipatory leadership practices principals utilized. These theories framed the context of this study by recognizing the need to address how support is actualized to African-American female students in STEM by their principals. A case study approach was an appropriate method to answer the two research questions, 1) How do principals feel they support African-American female students in their STEM programs? and 2) What practices do principals engage in that support underrepresented students in STEM? This approach intended to uncover how a principal leads a multifaceted population of underrepresented students in STEM programs. Two principals of STEM schools, where more than 50% of the population were African-American, were interviewed and observed completing daily operations at community-wide events. The STEM Coordinators and a teacher were also interviewed, and test scores were examined to provide further information about the STEM program, and public records were obtained to analyze the principals' means of communication. I found that principals supported

  20. Fast, Exact Bootstrap Principal Component Analysis forp> 1 million.

    Science.gov (United States)

    Fisher, Aaron; Caffo, Brian; Schwartz, Brian; Zipunnikov, Vadim

    Many have suggested a bootstrap procedure for estimating the sampling variability of principal component analysis (PCA) results. However, when the number of measurements per subject ( p ) is much larger than the number of subjects ( n ), calculating and storing the leading principal components from each bootstrap sample can be computationally infeasible. To address this, we outline methods for fast, exact calculation of bootstrap principal components, eigenvalues, and scores. Our methods leverage the fact that all bootstrap samples occupy the same n -dimensional subspace as the original sample. As a result, all bootstrap principal components are limited to the same n -dimensional subspace and can be efficiently represented by their low dimensional coordinates in that subspace. Several uncertainty metrics can be computed solely based on the bootstrap distribution of these low dimensional coordinates, without calculating or storing the p -dimensional bootstrap components. Fast bootstrap PCA is applied to a dataset of sleep electroencephalogram recordings ( p = 900, n = 392), and to a dataset of brain magnetic resonance images (MRIs) ( p ≈ 3 million, n = 352). For the MRI dataset, our method allows for standard errors for the first 3 principal components based on 1000 bootstrap samples to be calculated on a standard laptop in 47 minutes, as opposed to approximately 4 days with standard methods.

  1. Longitudinal functional principal component modelling via Stochastic Approximation Monte Carlo

    KAUST Repository

    Martinez, Josue G.

    2010-06-01

    The authors consider the analysis of hierarchical longitudinal functional data based upon a functional principal components approach. In contrast to standard frequentist approaches to selecting the number of principal components, the authors do model averaging using a Bayesian formulation. A relatively straightforward reversible jump Markov Chain Monte Carlo formulation has poor mixing properties and in simulated data often becomes trapped at the wrong number of principal components. In order to overcome this, the authors show how to apply Stochastic Approximation Monte Carlo (SAMC) to this problem, a method that has the potential to explore the entire space and does not become trapped in local extrema. The combination of reversible jump methods and SAMC in hierarchical longitudinal functional data is simplified by a polar coordinate representation of the principal components. The approach is easy to implement and does well in simulated data in determining the distribution of the number of principal components, and in terms of its frequentist estimation properties. Empirical applications are also presented.

  2. Contribution to the study of the evolution of radiation induced He in Be O; Etudes sur l'evolution de l'helium produit par reactions nucleaires dans l'oxyde de beryllium

    Energy Technology Data Exchange (ETDEWEB)

    Bareau, J. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1966-11-15

    The purpose of this work in-pile investigation of He formed by (n, 2n) and (n, {alpha}) nuclear reactions, released from irradiated BeO, in the temperature range 1000 - 1350 deg. C. The experimental results show that, for an instantaneous neutron fast flux of 10{sup 13} n cm{sup -2} sec{sup -1}, an equilibrium is attempted, after several days, for a part lower than 20 per cent of the quantity of He formed, theoretically calculated from the neutron cross sections of nuclear reactions, and from the analytical form of the neutron fast flux, releases from the solid. The validity of the values of calculated helium and the gas chromatographic analytical method are also verified by dissolution of the BeO pellets in cryolite. A new fast neutron flux measuring method may be so defined. The discussion of the experimental results enables to establish that the processus of He release is characterized by two phenomena: the first one which controls the release of He atoms out of the solid and the second which reveals a capture processus, connected to the irradiation and probably due to the vacancies induced in the lattice. (author) [French] On etudie en pile le degagement de l'helium forme par reactions nucleaires (n, 2 n) et (n, {alpha}) dans l'oxyde de beryllium irradie entre 1000 et 1350 deg. C. Les resultats experimentaux montrant que, pour un flux rapide instantane de 10{sup 13} n{sub r} cm{sup -2} s{sup -1}, on aboutit, au bout de quelques jours, a un etat d'equilibre pour lequel une partie, inferieure a 20 pour cent de la quantite d'helium forme, calculee theoriquement a partir des sections efficaces des reactions nucleaires et de la forme analytique du flux rapide, s'echappe du solide. On verifie egalement par dissolution des echantillons de BeO dans la cryolithe la validite du calcul de l'helium et de la methode de dosage par chromatographie en phase gazeuse. On peut ainsi definir une methode nouvelle de mesure des flux rapides. La

  3. Sparse logistic principal components analysis for binary data

    KAUST Repository

    Lee, Seokho

    2010-09-01

    We develop a new principal components analysis (PCA) type dimension reduction method for binary data. Different from the standard PCA which is defined on the observed data, the proposed PCA is defined on the logit transform of the success probabilities of the binary observations. Sparsity is introduced to the principal component (PC) loading vectors for enhanced interpretability and more stable extraction of the principal components. Our sparse PCA is formulated as solving an optimization problem with a criterion function motivated from a penalized Bernoulli likelihood. A Majorization-Minimization algorithm is developed to efficiently solve the optimization problem. The effectiveness of the proposed sparse logistic PCA method is illustrated by application to a single nucleotide polymorphism data set and a simulation study. © Institute ol Mathematical Statistics, 2010.

  4. Fuzzy Genetic Algorithm Based on Principal Operation and Inequity Degree

    Science.gov (United States)

    Li, Fachao; Jin, Chenxia

    In this paper, starting from the structure of fuzzy information, by distinguishing principal indexes and assistant indexes, give comparison of fuzzy information on synthesizing effect and operation of fuzzy optimization on principal indexes transformation, further, propose axiom system of fuzzy inequity degree from essence of constraint, and give an instructive metric method; Then, combining genetic algorithm, give fuzzy optimization methods based on principal operation and inequity degree (denoted by BPO&ID-FGA, for short); Finally, consider its convergence using Markov chain theory and analyze its performance through an example. All these indicate, BPO&ID-FGA can not only effectively merge decision consciousness into the optimization process, but possess better global convergence, so it can be applied to many fuzzy optimization problems.

  5. The Role of School Principals in Shaping Children's Values.

    Science.gov (United States)

    Berson, Yair; Oreg, Shaul

    2016-12-01

    Instilling values in children is among the cornerstones of every society. There is wide agreement that beyond academic teaching, schools play an important role in shaping schoolchildren's character, imparting in them values such as curiosity, achievement, benevolence, and citizenship. Despite the importance of this topic, we know very little about whether and how schools affect children's values. In this large-scale longitudinal study, we examined school principals' roles in the development of children's values. We hypothesized that relationships exist between principals' values and changes in children's values through the mediating effect of the school climate. To test our predictions, we collected data from 252 school principals, 3,658 teachers, and 49,401 schoolchildren. A multilevel structural-equation-modeling analysis yielded overall support for our hypotheses. These findings contribute to understanding the development of children's values and the far-reaching impact of leaders' values. They also demonstrate effects of schools on children beyond those on academic achievement.

  6. Principal component analysis for ataxic gait using a triaxial accelerometer.

    Science.gov (United States)

    Matsushima, Akira; Yoshida, Kunihiro; Genno, Hirokazu; Ikeda, Shu-Ichi

    2017-05-02

    It is quite difficult to evaluate ataxic gait quantitatively in clinical practice. The aim of this study was to analyze the characteristics of ataxic gait using a triaxial accelerometer and to develop a novel biomarker of integrated gate parameters for ataxic gait. Sixty-one patients with spinocerebellar ataxia (SCA) or multiple system atrophy with predominant cerebellar ataxia (MSA-C) and 57 healthy control subjects were enrolled. The subjects were instructed to walk 10 m for a total of 12 times on a flat floor at their usual walking speed with a triaxial accelerometer attached to their back. Gait velocity, cadence, step length, step regularity, step symmetry, and degree of body sway were evaluated. Principal component analysis (PCA) was used to analyze the multivariate gait parameters. The Scale for the Assessment and Rating of Ataxia (SARA) was evaluated on the same day of the 10-m walk trial. PCA divided the gait parameters into four principal components in the controls and into two principal components in the patients. The four principal components in the controls were similar to those found in earlier studies. The second principal component in the patients had relevant factor loading values for gait velocity, step length, regularity, and symmetry in addition to the degree of body sway in the medio-lateral direction. The second principal component score (PCS) in the patients was significantly correlated with disease duration and the SARA score of gait (ρ = -0.363, p = 0.004; ρ = -0.574, p gait. The PCS of the main component was significantly different between the patients and controls, and it was well correlated with disease duration and the SARA score of gait in the patients. We propose that this score provides a novel method to assess the severity of ataxic gait quantitatively using a triaxial accelerometer.

  7. Sparse Principal Component Analysis in Medical Shape Modeling

    DEFF Research Database (Denmark)

    Sjöstrand, Karl; Stegmann, Mikkel Bille; Larsen, Rasmus

    2006-01-01

    Principal component analysis (PCA) is a widely used tool in medical image analysis for data reduction, model building, and data understanding and exploration. While PCA is a holistic approach where each new variable is a linear combination of all original variables, sparse PCA (SPCA) aims...... analysis in medicine. Results for three different data sets are given in relation to standard PCA and sparse PCA by simple thresholding of sufficiently small loadings. Focus is on a recent algorithm for computing sparse principal components, but a review of other approaches is supplied as well. The SPCA...

  8. Le principe non bis in idem et le droit communautaire

    OpenAIRE

    Hedabou, Aziz

    2018-01-01

    Le principe non bis in idem est une garantie fondamentale qui interdit que les mêmes faits soit poursuivi et puni deux fois. Il est reconnu par tous les droits internes et “appartient aux droit universel des nations”. Dès lors, sa lettre et son esprit ne sont plus cantonnés au droit interne et ont tendance à s’internationaliser. En droit communautaire, l’étude du principe non bis in idem peut être envisagée sous trois angles différents. D’abord en droit pénal international unilatéral où chaqu...

  9. Tables of the principal unitary representations of Fedorov groups

    CERN Document Server

    Faddeyev, D K

    1961-01-01

    Tables of the Principal Unitary Representations of Fedorov Groups contains tables of all the principal representations of Fedorov groups from which all irreducible unitary representations can be obtained with the help of some standard operations. The work originated at a seminar on mathematical crystallography held in 1952-1953 at the Faculty of Mathematics and Mechanics of the Leningrad State University. The book is divided into two parts. The first part discusses the relation between the theory of representations and the generalized Fedorov groups in Shubnikov's sense. It shows that all un

  10. Principality of Serbia on the road towards European monetary standards

    Directory of Open Access Journals (Sweden)

    Gnjatović Dragana

    2015-01-01

    Full Text Available In 1868, after more than four centuries, the Principality of Serbia decided to rebuild national monetary system in line with the minting standards of the Latin Monetary Union. The paper explains the international circumstances in which this decision was made and analyzes a specific plan created for the implementation of monetary reform. Because of the general shortage of small coins in circulation, Serbia decided firstly to mint domestic copper and small silver coins, and subsequently larger denominations of silver and gold coins. The research is based on archival documents of the State Council of the Principality of Serbia that are kept in the Archives of Serbia in Belgrade.

  11. Restriction Theorem for Principal bundles in Arbitrary Characteristic

    DEFF Research Database (Denmark)

    Gurjar, Sudarshan

    2015-01-01

    The aim of this paper is to prove two basic restriction theorem for principal bundles on smooth projective varieties in arbitrary characteristic generalizing the analogues theorems of Mehta-Ramanathan for vector bundles. More precisely, let G be a reductive algebraic group over an algebraically...... closed field k and let X be a smooth, projective variety over k together with a very ample line bundle O(1). The main result of the paper is that if E is a semistable (resp. stable) principal G-bundle on X w.r.t O(1), then the restriction of E to a general, high multi-degree, complete-intersection curve...

  12. Examining the Relationship between Principal Leadership and School Climate

    Science.gov (United States)

    Lane, Eric S.

    2016-01-01

    The purpose of this quantitative study was to explore the relationship between transformative school principal leadership and school climate. The population of this study consisted of two middle schools with grades ranging from six through eight and one high school with grades ranging from nine through twelve. These schools are within the state of…

  13. Social Intelligence of Principals and Its Relationship with Creative Behavior

    Science.gov (United States)

    Kriemeen, Hani; Hajaia, Sulaiman

    2017-01-01

    The study aimed at investigating the level of the social intelligence among the male and female principals in Tafila Governorate from the teachers views and its relationship with creative behavior. The sample consisted of 190 male and female teachers chosen randomly. For achieving the goals of the study, the researchers developed two instruments,…

  14. Interpolating the South African Yield Curve using Principal ...

    African Journals Online (AJOL)

    A principal-components analysis of the South African yield curve suggests that two factors explain most of the variability in both yields and changes in yields. This result is used to select which two interest rates to model and, given a model for these rates, how to use them to reproduce the entire curve. The objective of this ...

  15. Learners' and teachers' perceptions of principals' leadership in ...

    African Journals Online (AJOL)

    social justice framework, how teachers and learners who are SGB members perceive and experience the principals' .... which inflict psychological harm and restrict people's freedom (Applebaum, 2003). According to Brown (2006), ..... gical damage that poses a threat to the stability and management effectiveness of schools.

  16. Pennsylvania Principals' Perceptions of Childhood Obesity

    Science.gov (United States)

    Wolfrom, Sean E.

    2017-01-01

    The purpose of this study was to determine Pennsylvania principals' perceptions and understanding of the physical and psychosocial impact of childhood obesity, whether they believe schools should be addressing the issue, who they feel should be leading efforts within schools, what actions they believe are taking place to address the issue within…

  17. Transformational Leadership and Globalization: Attitudes of School Principals in Kuwait

    Science.gov (United States)

    Alsaeedi, Farraj; Male, Trevor

    2013-01-01

    The study explores the attitudes of a sample of school principals in a Kuwaiti local authority towards the need for transformational leadership, the use of its behaviours, whether these school leaders are ready to behave in diverse ways or whether there are barriers that prevent them from acting in such a manner. The findings of this study…

  18. The experiences of female principals on curriculum leadership in ...

    African Journals Online (AJOL)

    Firstly, that women if given opportunity and support they are able to use their feminine skills and behaviours to make schools enabling environments. Secondly, that women have a disposition to promote social change and to serve others better. Keywords: Principals, Women, Curriculum, Leadership, Transformation ...

  19. Influence of Principals' Administrative Style on the Job Performance ...

    African Journals Online (AJOL)

    The objective was to evaluate the administrative style of secondary school principals in relation to teachers' job performance in Cross River State, Nigeria. A total of four hundred (400) teachers and one thousand two hundred (1200) students were randomly sampled for the study, using Ex-post facto research design with ...

  20. Principals' Leadership Style and Staff Job Performance in Selected ...

    African Journals Online (AJOL)

    This study examined the relationship between principals' leadership style and staff job performance in Emohua Local Government Area of River State. The study was carried out within the period of 2007-2016 in secondary schools in Emohua Local Government Area of Rivers State. Path-Goal theory was adopted as the ...

  1. Principal efforts in improving the understanding of Climate impact of ...

    Indian Academy of Sciences (India)

    First page Back Continue Last page Overview Graphics. Principal efforts in improving the understanding of Climate impact of aerosols -. New and enhanced satellite borne sensors. Focused field experiments. Establishment and enhancement of ground based networks. Development and deployment of new and enhanced ...

  2. Bearing the Burden of Desegregation. Black Principals and "Brown"

    Science.gov (United States)

    Karpinski, Carol

    2006-01-01

    "Brown" had a tragic consequence: the displacement, dismissal, and demotion of thousands of African American educators, in particular principals, in the South. Although the lack of diversity in today's teaching force has multiple origins, a reexamination of one of its roots deepens our understanding of the past, illuminates the present,…

  3. Principal Component Clustering Approach to Teaching Quality Discriminant Analysis

    Science.gov (United States)

    Xian, Sidong; Xia, Haibo; Yin, Yubo; Zhai, Zhansheng; Shang, Yan

    2016-01-01

    Teaching quality is the lifeline of the higher education. Many universities have made some effective achievement about evaluating the teaching quality. In this paper, we establish the Students' evaluation of teaching (SET) discriminant analysis model and algorithm based on principal component clustering analysis. Additionally, we classify the SET…

  4. The Abusive School Principal: A South African Case Study

    Science.gov (United States)

    de Wet, Corene

    2013-01-01

    Since the 1990s there has been increased public interest, debate and research on workplace bullying. Little research has, however, been done on the abuse of educators or on the bullies per se. The aim of this paper is to expand the body of knowledge on workplace bullying by shedding light on the character of a bullying school principal. In 2008 I…

  5. School Choice and Administrators: Will Principals Become Marketers?

    Science.gov (United States)

    Robenstine, Clark

    2000-01-01

    Argues that school choice, with its reliance on market forces, has serious implications for what goes on inside the school and the principal's role. Looks at changes in administrative focus and management style; at administrators and school marketing, with image management increasingly preoccupying school administrators; and the almost exclusive…

  6. Principal Instructional Leadership Behaviors: Teacher vs. Self-Perceptions

    Science.gov (United States)

    Gurley, D. Keith; Anast-May, Linda; O'Neal, Marcia; Dozier, Randy

    2016-01-01

    In response to ever-increasing accountability of school principals to demonstrate higher levels of student achievement, instructional leadership continues to be an important focus among educational researchers. In this paper, researchers briefly review the literature base regarding instructional leadership, then present the conceptual framework…

  7. Verbal and Nonverbal Micropolitical Communication of Female School Principals.

    Science.gov (United States)

    Carr, Carolyn S.

    Verbal and nonverbal communication as an expression of political influence and power plays a major part in constructing and transmitting an androcentric bias in educational administration. This paper describes findings of a study that examined the form, meaning, and function of three female principals' verbal and nonverbal communication behaviors,…

  8. Primary Principals' Leadership Styles, School Organizational Health and Workplace Bullying

    Science.gov (United States)

    Cemaloglu, Necati

    2011-01-01

    Purpose: The purpose of this paper is to determine the relationships between leadership styles of primary school principals and organizational health and bullying. Design/methodology/approach: Two hypotheses were formulated in relation to the research. Three instruments were used--a multi-level questionnaire for measuring leadership, an…

  9. Recovering short generators of principal ideals in cyclotomic rings

    NARCIS (Netherlands)

    R.J.F. Cramer (Ronald); L. Ducas (Léo); C. Peikert; O. Regev (Oded); M. Fischlin; J.S. Coron

    2016-01-01

    htmlabstractAbstract: A handful of recent cryptographic proposals rely on the conjectured hardness of the following problem in the ring of integers of a cyclotomic number field: given a basis of a principal ideal that is guaranteed to have a ``rather short'' generator, find such a generator.

  10. Principal components regression of body measurements in five ...

    African Journals Online (AJOL)

    This study aimed at unfolding the interdependence among the linear body measurements in chickens and to predict body weight from their orthogonal body measurements using principal component regression. Body weight and seven biometric traits that are; body length (BL), breast girth (BG), wing length (WL), wing span ...

  11. Sustainable School Improvement: Suburban Elementary Principals' Capacity Building

    Science.gov (United States)

    Clark, Alison J.

    2017-01-01

    The increase of intense pressures to ensure long-term education reforms have created a challenge for school leaders as they direct and nurture the abilities of others. The purpose of this research was to understand and describe suburban elementary principals' practices and perceptions as change leaders related to capacity building through the…

  12. The influence of principal managerial task performance on ...

    African Journals Online (AJOL)

    Poor performance of managerial tasks culminates declining staff productivity and thus deteriorating students academic performance. Secondary school students performance in most public examinations are not satisfactory in most states in Nigeria. Hence, this study investigate the extent to which secondary school principal ...

  13. Examining the Planning and Management of Principal Succession

    Science.gov (United States)

    Zepeda, Sally J.; Bengtson, Ed; Parylo, Oksana

    2012-01-01

    Purpose: The purpose of this study is to examine principal succession planning and management by analyzing current practices of handling school leader succession in four Georgia school systems. Design/methodology/approach: Looking through the lens of organizational leadership succession theory, the practices of school systems as they experienced…

  14. 5 CFR 340.101 - Principal statutory requirements.

    Science.gov (United States)

    2010-01-01

    ... additional income; (D) benefits students who must finance their own education or vocational training; (E) benefits the Government, as an employer, by increasing productivity and job satisfaction, while lowering... benefit of the user of the principal statutory requirements governing part-time career employment, as...

  15. Principals' Socialization: Whose Responsibility Is It?

    Science.gov (United States)

    Bengtson, Ed

    2014-01-01

    This conceptual article attempts to answer the question, who should be responsible for the socialization of principals? In reaction to the criticism targeting educational leadership programs in the United States, this article discusses how individuals moving into the leadership role, educational leadership preparation programs, and school systems…

  16. School Principals in Spain: An Unstable Professional Identity

    Science.gov (United States)

    Ritacco Real, Maximiliano; Bolívar Botía, Antonio

    2018-01-01

    The article proposes an emerging approach in research on school leadership, within the framework of the "International Successful School Principalship Project (ISSPP)", where one of the three key research strands is "Principals' identities". It formulates, first, the theoretical framework for the professional identity from a…

  17. Light Touch, Heavy Hand: Principals and Data-Use PLCs

    Science.gov (United States)

    Huguet, Alice; Farrell, Caitlin C.; Marsh, Julie A.

    2017-01-01

    Purpose: The use of data for instructional improvement is prevalent in today's educational landscape, yet policies calling for data use may result in significant variation at the school level. The purpose of this paper is to focus on tools and routines as mechanisms of principal influence on data-use professional learning communities (PLCs).…

  18. IN-SERVICE EDUCATION OF ELEMENTARY SCHOOL PRINCIPALS.

    Science.gov (United States)

    PHARIS, WILLIAM L.

    THE NEED FOR CONTINUING EDUCATION OF THE ELEMENTARY SCHOOL PRINCIPAL IS EMPHASIZED, ESPECIALLY AS IT RELATES TO SOCIAL PROBLEMS (POPULATION EXPLOSION, URBANIZATION, RESOURCE DISTRIBUTION, IMBALANCE, AND POPULATION MOBILITY) WHOSE EVENTUAL SOLUTIONS DEPEND UPON EDUCATION. PARTICULAR AREAS OF EDUCATIONAL CHANGE REQUIRING INSERVICE EDUCATION OF…

  19. Principal leadership and its impact on student discipline in Kenyan ...

    African Journals Online (AJOL)

    This paper attempts to establish the relationship between leadership approach and students' discipline in secondary schools. A descriptive survey design was adopted to obtain data allowing the accurate description of situations or relationships in schools in Koibatek District. The study targeted principals, teachers and ...

  20. Influence of principals' leadership style and teachers' attitude to work ...

    African Journals Online (AJOL)

    There is a serious concern about the spate of indiscipline among youths in recent times, especially those in secondary schools. This study sets out to assess how the leadership style of principals and teachers' attitude to works influence discipline among secondary schools students in Akamkpa Local Government Area ...

  1. 40 CFR 264.342 - Principal organic hazardous constituents (POHCs).

    Science.gov (United States)

    2010-07-01

    ...) Principal Organic Hazardous Constituents (POHCs) in the waste feed must be treated to the extent required by... organic constituents in the waste and on their concentration or mass in the waste feed, considering the... (CONTINUED) SOLID WASTES (CONTINUED) STANDARDS FOR OWNERS AND OPERATORS OF HAZARDOUS WASTE TREATMENT, STORAGE...

  2. The Social Intelligence of Principals: Links to Teachers' Continuous Improvement

    Science.gov (United States)

    McQuade, Joan

    2013-01-01

    Despite multiple efforts to reform 21st education to better meet the needs of all students, school improvement successes have been sporadic and debatable. Research suggests that significant improvement lies within the purview of teachers and principals, and this current research provided the underpinnings for the study. Based on neuroscience…

  3. Rural Principal Attitudes toward Poverty and the Poor

    Science.gov (United States)

    Gholson, Melissa L.

    2015-01-01

    This study used Yun and Weaver's (2010) Attitudes toward Poverty Short Form (ATP-SF) of twenty-one items on a Likert-type scale to determine the poverty attitudes of 309 principals in a rural Appalachian state in the United States. The study compared the poverty attitudes from the ATP-SF scaled score as a dependent variable to the following…

  4. Principal Component Surface (2011) for Fish Bay, St. John

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This image represents a 0.3x0.3 meter principal component analysis (PCA) surface for areas inside Fish Bay, St. John in the U.S. Virgin Islands (USVI). It was...

  5. Principal Component Analysis of Body Measurements In Three ...

    African Journals Online (AJOL)

    This study was conducted to explore the relationship among body measurements in 3 strains of broilers chicken (Arbor Acre, Marshal and Ross) using principal component analysis with the view of identifying those components that define body conformation in broilers. A total of 180 birds were used, 60 per strain.

  6. Pastoral Care: Notions of Caring and the Black Female Principal

    Science.gov (United States)

    Witherspoon, Noelle; Arnold, Bruce Makoto

    2010-01-01

    The purpose of this qualitative life narrative study was to describe the themes and patterns in which religio-spirituality influences the leadership process for four Black American principals. The study explored how these women leaders navigated intersecting oppressions as they engaged in social justice in their schools and the role of…

  7. Principals and the Politics of Resistance to Change

    Science.gov (United States)

    Starr, Karen

    2011-01-01

    Governments hold principals accountable for leading and managing significant change for school improvement, primarily demonstrated through enhanced student test results. Research evidence suggests, however, that schools are slow to change, that many individuals are resistant to major change and that school reforms are often cursory or short lived.…

  8. A New Principal for Tchikobou High School: Resistance to Change

    Science.gov (United States)

    Boncana, Mohomodou; Crow, Gary M.

    2008-01-01

    This case study explains the functional or practical difficulties that many organizations face when they change their leaders. By describing the experiences of the two principals, two distinct styles of leadership are displayed, each of which provides the reader with the opportunity to understand some aspects of frames in organizations:…

  9. Arab Women Principals' Empowerment and Leadership in Israel

    Science.gov (United States)

    Shapira, Tamar; Arar, Khalid; Azaiza, Faisal

    2010-01-01

    Purpose: This paper's purpose is to tell the life-stories of four women who succeeded in forging paths to senior positions as principals in Arab schools in Israel and to describe the personal, professional and sociopolitical contexts of their principalship. Design/methodology/approach: This is part of a larger research effort that explored the…

  10. Dimensionality reduction of collective motion by principal manifolds

    Science.gov (United States)

    Gajamannage, Kelum; Butail, Sachit; Porfiri, Maurizio; Bollt, Erik M.

    2015-01-01

    While the existence of low-dimensional embedding manifolds has been shown in patterns of collective motion, the current battery of nonlinear dimensionality reduction methods is not amenable to the analysis of such manifolds. This is mainly due to the necessary spectral decomposition step, which limits control over the mapping from the original high-dimensional space to the embedding space. Here, we propose an alternative approach that demands a two-dimensional embedding which topologically summarizes the high-dimensional data. In this sense, our approach is closely related to the construction of one-dimensional principal curves that minimize orthogonal error to data points subject to smoothness constraints. Specifically, we construct a two-dimensional principal manifold directly in the high-dimensional space using cubic smoothing splines, and define the embedding coordinates in terms of geodesic distances. Thus, the mapping from the high-dimensional data to the manifold is defined in terms of local coordinates. Through representative examples, we show that compared to existing nonlinear dimensionality reduction methods, the principal manifold retains the original structure even in noisy and sparse datasets. The principal manifold finding algorithm is applied to configurations obtained from a dynamical system of multiple agents simulating a complex maneuver called predator mobbing, and the resulting two-dimensional embedding is compared with that of a well-established nonlinear dimensionality reduction method.

  11. Principal Leadership and the Colorado Innovation Schools Act of 2008

    Science.gov (United States)

    Walsh, Margaret A.

    2012-01-01

    The purpose of this phenomenological study was to explore the experiences and perceptions of principals whose schools were granted innovation status in accordance with the "Colorado Innovation Schools Act of 2008" (CISA). The CISA created a statewide system that allowed individual schools and entire districts to increase autonomy and…

  12. Catalysts for Redesigning Principal Preparation: A Courageous Journey

    Science.gov (United States)

    Buskey, Frederick; Jacobs, Jacqueline

    2009-01-01

    A review of the research, state legislative mandates, and education department requirements (Levin, 2005; Hess & Kelly, 2005; Marzano, Water, & McNulty, 2005; N.C. House Bill 536, 2007) shows different demands for the redesign of principal licensure programs. Program redesign always has some sort of catalyst. However, just because there is…

  13. Invisible Barriers: The Loneliness of School Principals at Turkish ...

    African Journals Online (AJOL)

    x

    2016-11-10

    Nov 10, 2016 ... two semesters of the 2015-2016 academic year. ... School principals are expected to act as the “leaders” of teachers, support staff and students at their .... provocation of undesired “behaviours” such as the avoiding of social interaction and participation in social networks. The social and emotional loneli-.

  14. Using Subjective Teacher Evaluations to Examine Principals' Personnel Management

    Science.gov (United States)

    Master, Benjamin

    2013-01-01

    Teacher evaluation is at the center of current education policy reform. Most evaluation systems rely at least in part on principals' assessments of teachers, and their discretionary judgments carry substantial weight. However, we know relatively little about what they value when determining evaluations and high stakes personnel decisions. The…

  15. Dimensionality reduction using Principal Component Analysis for network intrusion detection

    Directory of Open Access Journals (Sweden)

    K. Keerthi Vasan

    2016-09-01

    Full Text Available Intrusion detection is the identification of malicious activities in a given network by analyzing its traffic. Data mining techniques used for this analysis study the traffic traces and identify hostile flows in the traffic. Dimensionality reduction in data mining focuses on representing data with minimum number of dimensions such that its properties are not lost and hence reducing the underlying complexity in processing the data. Principal Component Analysis (PCA is one of the prominent dimensionality reduction techniques widely used in network traffic analysis. In this paper, we focus on the efficiency of PCA for intrusion detection and determine its Reduction Ratio (RR, ideal number of Principal Components needed for intrusion detection and the impact of noisy data on PCA. We carried out experiments with PCA using various classifier algorithms on two benchmark datasets namely, KDD CUP and UNB ISCX. Experiments show that the first 10 Principal Components are effective for classification. The classification accuracy for 10 Principal Components is about 99.7% and 98.8%, nearly same as the accuracy obtained using original 41 features for KDD and 28 features for ISCX, respectively.

  16. Assessment of drinking water quality using principal component ...

    African Journals Online (AJOL)

    The Partial Least Square Discriminant Analysis (PLS-DA) model showed a high correlation matrix of analysis for physicochemical quality of two types of water with 99.43% significant value. The classification matrix accuracy of the principal component analysis (PCA) highlighted 13 significant physico-chemical water quality ...

  17. Principals' Perceptions of Instructional Leadership Development

    Science.gov (United States)

    Brabham, Carla E.

    2017-01-01

    Instructional leadership is an important aspect of student achievement and the overall success of schools. Principals, as instructional leaders, need continual reflection on their competency. Job-embedded professional development (JEPD) for teachers is implemented and monitored by instructional leaders. The purpose of this case study was to…

  18. Water quality of the Chhoti Gandak River using principal component ...

    Indian Academy of Sciences (India)

    The principal components of water quality are controlled by lithology, gentle slope gradient, poor drainage, long residence of water, ion exchange, weathering of minerals, heavy use of fertilizers, and domestic wastes. At some stations water is hard with an excess alkalinity and is not suitable for drinking and irrigation ...

  19. Teacher and Administrator Views on School Principals' Accountability

    Science.gov (United States)

    Argon, Turkan

    2015-01-01

    The current study aims to identify teacher and administrator views regarding primary school principals' accountability. The case study model, a qualitative research method, was adopted in the study using the holistic single-case design. The working group was composed of a total of 56 individuals, 42 teachers and 14 administrators (11 principals…

  20. Public Relations for Principals. "A Guidebook for the Pennsylvania Administrator."

    Science.gov (United States)

    Pennsylvania School Boards Association, Inc., Harrisburg.

    This report discusses what makes news, what people want to read, and how to write news releases or other informative bulletins and brochures. Also included are a description of principal-reporter-editor relations, some layout and typography data, and photography instructions. (JF)

  1. Perception Based Principal Leadership Measurement: Does It Work in Pakistan?

    Science.gov (United States)

    Niqab, Muhammad; Sharma, Sailesh; Ali, Niaz; Mubarik, Muhammad Shujaat

    2015-01-01

    Adequacy of relevant knowledge and interpersonal skills, interalia, are vital contributors to a successful leadership. However, leadership is not a self-centered phenomenon but followers through their actions and views profess it. Extant literature suggests teachers' and principals' perceptions as a prominent tool for measuring school leadership.…

  2. An Exploration of Two Female Principals' Leadership in Mainland China

    Science.gov (United States)

    Zhong, Wanjuan; Ehrich, Lisa Catherine

    2010-01-01

    Purpose: The purpose of this paper is to explore two dimensions of leadership practices (i.e. teaching and learning and sources of power) used by two exemplary principals in mainland China against a background of education reform and to identify how broader contextual factors have shaped these two dimensions of their leadership.…

  3. The $2 Million Decision: Teacher Selection and Principals' Interviewing Practices

    Science.gov (United States)

    Hindman, Jennifer; Stronge, James

    2009-01-01

    The authors conducted a study to determine the degree to which principals use research-based interviewing practices and found that educational leaders frequently report using recommended practices. This study is a part of a larger study in which the extant research literature on qualities of effective teachers and selection interviews were…

  4. Principals Leading Learning: Developing and Applying a Leadership Framework

    Science.gov (United States)

    Dempster, Neil

    2012-01-01

    This article addresses the way in which principals can contribute to closing the unacceptable gap in literacy achievement in Australia for low socio-economic status (SES) students by connecting leadership work more directly with the conditions which influence teaching and learning. It draws upon the outcomes of a project funded under the…

  5. Effects of Support on Stress and Burnout in School Principals

    Science.gov (United States)

    Beausaert, Simon; Froehlich, Dominik E.; Devos, Christelle; Riley, Philip

    2016-01-01

    Background: More than ever before, school principals are dealing with stress and burnout, resulting from increasing role demands and decreasing decision latitude and autonomy. Following the Demand-Support-Constraints model, reasons for stress and burnout can be found in the lack of social support in the environment. Purpose: This longitudinal…

  6. Conseiller principal, Affaires publiques (h/f) | CRDI - Centre de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Résumé des fonctions Le conseiller principal, Affaires publiques agit à titre de chef des communications pour un portefeuille de clients attribué en vue d'offrir des services de communications intégrés. Plus particulièrement, le conseiller se penche sur les besoins relatifs aux communications, fournit des conseils, assure une ...

  7. Group-wise Principal Component Analysis for Exploratory Data Analysis

    NARCIS (Netherlands)

    Camacho, J.; Rodriquez-Gomez, Rafael A.; Saccenti, E.

    2017-01-01

    In this paper, we propose a new framework for matrix factorization based on Principal Component Analysis (PCA) where sparsity is imposed. The structure to impose sparsity is defined in terms of groups of correlated variables found in correlation matrices or maps. The framework is based on three new

  8. The Role of Principals in Professional Learning Communities

    Science.gov (United States)

    Buttram, Joan L.; Farley-Ripple, Elizabeth N.

    2016-01-01

    The purpose of this article is to identify how principals shape the adoption and implementation of professional learning communities. The study employed a sequential mixed-methods approach in which interviews, observations, and document analysis informed survey design. Teachers were surveyed in four elementary schools about the practices and…

  9. The significance of training school principals and educators in ...

    African Journals Online (AJOL)

    South African government has made significant strides in developing inclusive education policies as compared to other African countries, but it has not done enough to ensure that skills of principals and of educators who will be involved in inclusive education are properly developed. Furthermore limited preparations have ...

  10. Values and Assumptions in Contestation over School Councils Selecting Principals.

    Science.gov (United States)

    Macpherson, R. J. S.

    1983-01-01

    Many of the arguments in the Victoria Department of Education, Australia, against the involvement of school councils in the selection of principals are based on careerism, opportunism, and protectionism. To move away from the lock-step adherence to the values that lead to accession by seniority requires the application of democratic methods.…

  11. The Challenge of Educating Principals: Linking Course Content to Action

    Science.gov (United States)

    Ärlestig, Helene

    2012-01-01

    Effective integration of learning and practice continues to remain a challenge in leadership preparation. This paper describes a learning module used in a course within the Swedish National Principal Training Program and how it attempts to bridge learning with practice. In this course, each participant conducted a study in a school with the…

  12. Issues in Marketing Education: What Do Principals Think?

    Science.gov (United States)

    Wrisley, Robert; Swope, John

    1994-01-01

    According to a North Carolina survey, principals believe that all marketing graduates should be computer literate and that marketing courses are an effective way to integrate academic and vocational education. They feel that marketing teachers need to stay abreast of the business world and are interested in articulation, especially tech prep. (JOW)

  13. Analysis of breast cancer progression using principal component ...

    Indian Academy of Sciences (India)

    PRAKASH KUMAR

    We use this set of genes and a new consensus ensemble k-clustering technique, which averages over several clustering methods and many data perturbations, to identify strong, stable clusters. We also define a simple criterion to find the optimum number of. Analysis of breast cancer progression using principal component.

  14. PRINCIPAL AND TEACHER PERCEPTIONS OF SCHOOL FACULTY MEETINGS.

    Science.gov (United States)

    AMIDON, EDMUND; BLUMBERG, ARTHUR

    THE EFFECTS OF FACULTY MEETINGS ON TEACHER MORALE WERE INVESTIGATED VIA A SIX-ITEM QUESTIONNAIRE RESPONDED TO BY 40 ELEMENTARY AND 49 SECONDARY SCHOOL TEACHERS ENROLLED IN GROUP DYNAMICS WORK AT ONE UNIVERSITY AND BY 74 ELEMENTARY AND SECONDARY SCHOOL PRINCIPALS SELECTED AT RANDOM FROM A STATE EDUCATIONAL DIRECTORY. RESPONSES WERE ON A NINE-STEP,…

  15. The perceptions of teachers and school principals of each other's ...

    African Journals Online (AJOL)

    actual school-based management and could jeopardize the implementation of educational reform in general. Keywords: decentralised decision-making; educational change; principals' perceptions; school-based management; school reform; teacher involvement; teachers' perceptions. South African Journal of Education ...

  16. Principal component analysis of image gradient orientations for face recognition

    NARCIS (Netherlands)

    Tzimiropoulos, Georgios; Zafeiriou, Stefanos; Pantic, Maja

    We introduce the notion of Principal Component Analysis (PCA) of image gradient orientations. As image data is typically noisy, but noise is substantially different from Gaussian, traditional PCA of pixel intensities very often fails to estimate reliably the low-dimensional subspace of a given data

  17. Learners' and teachers' perceptions of principals' leadership in ...

    African Journals Online (AJOL)

    As ex officio members of School Governing Bodies (SGBs) and professional managers of schools, principals should play a pivotal role in providing transformative leadership for social justice in these schools. The purpose of this study was to examine, through a social justice framework, how teachers and learners who are ...

  18. Negligence: What Principals Need to Know about Avoiding Liability

    Science.gov (United States)

    DeMitchell, Todd A.

    2006-01-01

    A science teacher forgets to remind her students to wear their safety goggles during a chemistry experiment and one student is injured when the caustic chemicals he is working with splash into his eyes. A teacher is late for recess duty and a student falls from the swings and is injured. A principal sends one teacher and one student teacher on a…

  19. How Principals and Peers Influence Teaching and Learning

    Science.gov (United States)

    Supovitz, Jonathan; Sirinides, Philip; May, Henry

    2010-01-01

    This paper examines the effects of principal leadership and peer teacher influence on teachers' instructional practice and student learning. Using teacher survey and student achievement data from a mid-sized urban southeastern school district in the United States in 2006-2007, the study employs multilevel structural equation modeling to examine…

  20. When Will Principals Have No Need to Worry about Publications?

    Science.gov (United States)

    Clemons, Molly J.

    1988-01-01

    Describes a midwestern high school's serious student publications program. Over the past 20 years, students here have published major stories on incest, homosexuality, teen pregnancy, cheating, divorce, fatal illness, and other topics without prepublication scrutiny by the principal. Recommendations are provided to ensure fair coverage, relevant…

  1. Principals Performance of Supervision of Instructions in Public ...

    African Journals Online (AJOL)

    This study was designed to examine principals' performance of internal supervision of instructions in public secondary schools in Ebonyi State, Nigeria. Data were collected from a sample of 604 out of 1640 teachers using stratified random sampling across urban and rural schools and a structured questionnaire was ...

  2. Characteristics of Teachers Nominated for an Accelerated Principal Preparation Program

    Science.gov (United States)

    Rios, Steve J.; Reyes-Guerra, Daniel

    2012-01-01

    This article reports the initial evaluation results of a new accelerated, job-embedded principal preparation program funded by a Race to the Top Grant (U.S. Department of Education, 2012a) in Florida. Descriptive statistics, t-tests, and chi-square analyses were used to describe the characteristics of a group of potential applicants nominated to…

  3. Superintendents' Perceptions of Online Education for Principals

    Science.gov (United States)

    Rutledge, David

    2017-01-01

    The proliferation of online educational leadership programs has led many aspiring principal candidates to complete their entire degree or licensure program online. While the online education is convenient and flexible for the learner, there is sparse research to determine the acceptability of online degrees in educational leadership, especially…

  4. Efficacy of the Principal Components Analysis Techniques Using ...

    African Journals Online (AJOL)

    Second, the paper reports results of principal components analysis after the artificial data were submitted to three commonly used procedures; scree plot, Kaiser rule, and modified Horn's parallel analysis, and demonstrate the pedagogical utility of using artificial data in teaching advanced quantitative concepts. The results ...

  5. Schematic Harder–Narasimhan stratification for families of principal ...

    Indian Academy of Sciences (India)

    As a consequence, all principal bundles of a fixed Harder–Narasimhan type form an Artin stack. We also show the existence of a schematic Harder–Narasimhan stratification for flat families of pure sheaves of -modules (in the sense of Simpson) in arbitrary dimensions and in mixed characteristic, generalizing the result for ...

  6. Instructional Leadership: How Principals Conceptualize Their Roles as School Leaders

    Science.gov (United States)

    Cooper, Caryn D.

    2017-01-01

    Several research studies in education have shown there is a strong correlation between K-12 school principals, instructional leadership, and student achievement (Liethwood, Seashore-Louis, Anderson, & Wahlstrom, 2004; Waters, Marzano, & McNulty, 2003). Research has further revealed that, second only to the classroom teacher, principals…

  7. The Atiyah bundle and connections on a principal bundle

    Indian Academy of Sciences (India)

    correspond to the connections on EG. The pull back of EG to C(EG) has a tautological connection. We investigate the curvature of this tautological connection. Keywords. Principal bundle; connection; Atiyah bundle. 1. Introduction. Fix a Lie group G. Its Lie algebra will be denoted by g. Let M be a connected C. ∞ manifold.

  8. Empowering principals to lead and manage public schools ...

    African Journals Online (AJOL)

    Mestry, Rajkumar

    principals play a pivotal role in improving student learning and attaining educational outcomes, they work under strenuous conditions to deal with multifaceted ..... school management teams (SMTs), teachers, school governing bodies (SGBs) .... serve in his/her Development Support Group. (DSG), and they are responsible ...

  9. Clarifying the Coaching Roles: Principal, Department Head, Teacher.

    Science.gov (United States)

    Conway, James

    1991-01-01

    Coaching occurs in many fields, including music, drama, and various sports activities. Building a "coaching" metaphor might help clarify differences in coaching roles that principals and teachers find confusing. Most head coaches recognize that responsible evaluation is more helpful than absolute power in helping each player be the best…

  10. Water quality of the Chhoti Gandak River using principal component ...

    Indian Academy of Sciences (India)

    Water quality of the Chhoti Gandak River using principal component analysis, Ganga Plain, India. Vikram Bhardwaj1,∗, Dhruv Sen Singh1 and A K Singh. 2. 1. Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India. 2. Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 ...

  11. Principal Component Surface (2011) for Coral Bay, St. John

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This image represents a 0.3x0.3 meter principal component analysis (PCA) surface for areas inside Coral Bay, St. John in the U.S. Virgin Islands (USVI). It was...

  12. Schematic Harder–Narasimhan stratification for families of principal ...

    Indian Academy of Sciences (India)

    Home; Journals; Proceedings – Mathematical Sciences; Volume 124; Issue 3. Schematic Harder–Narasimhan Stratification for Families of Principal Bundles ... Author Affiliations. Sudarshan Gurjar1 Nitin Nitsure1. School of Mathematics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India ...

  13. A Principal's Dilemma: Full Inclusion or Student's Best Interests?

    Science.gov (United States)

    Oluwole, Joseph O.

    2009-01-01

    This case highlights one principal's struggle to reconcile his philosophy of full inclusion with the best interests of a student with serious emotional disturbance. It raises a number of issues that bring to light challenges posed by a system of full inclusion. It also provides an opportunity for educational leadership students and administrators…

  14. The job satisfaction of principals of previously disadvantaged schools

    African Journals Online (AJOL)

    The aim of this study was to identify influences on the job satisfaction of previously disadvantaged school principals in North-West Province. Evans's theory of job satisfaction, morale and motivation was useful as a conceptual framework. A mixedmethods explanatory research design was important in discovering issues with ...

  15. Leadership Styles of Principals and Job Performance of Staff in ...

    African Journals Online (AJOL)

    This study investigated the leadership styles of principals and the effect on job performance of teachers and supportive staff in senior secondary schools in Delta State of Nigeria. The population comprised all 358 senior secondary schools in the State from which a sample 120 was selected through the simple random ...

  16. Principal Components Analysis of Job Burnout and Coping ...

    African Journals Online (AJOL)

    The component structure of a 44-item scale measuring different aspects of job burnout incidence and 31-item scale on coping strategies were investigated, among extension officers in North West Province, South Africa. Items on job burnout and coping strategies s were measured at interval level and analyzed with Principal ...

  17. Principal Component Analysis: Most Favourite Tool in Chemometrics

    Indian Academy of Sciences (India)

    differentiate olive oils from non-olive vegetable oils. Moreover, manual analysis of such a large volume of data is laborious and time consuming, and may not provide any meaningful interpre-. Figure 4. Amount of vari- ance captured by different principal components (PCs). The plot indicates that first two PCs are sufficient to ...

  18. Stress in School Administration: Coping Tips for Principals

    Science.gov (United States)

    Sogunro, Olusegun Agboola

    2012-01-01

    With the need for rapid school reform amid changes in socioeconomic and political situations, evidence abounds that today's school principals operate in a stress-strained environment. Participants of this study identified at least a form of stress on the job. More than 96% claimed to have experienced work-related stress at a level they believed…

  19. Women Principals in South Africa: Gender, Mothering and Leadership

    Science.gov (United States)

    Lumby, Jacky; Azaola, Marta Cristina

    2014-01-01

    This paper draws on qualitative data from a mixed-method study that analysed women's access to the principal role and their leadership experiences. The paper draws on a subset of interviews with 54 female head teachers in the Gauteng and North West provinces of South Africa. Since a mothering style of leadership was self-reported by over half of…

  20. Principal causes and ways of prevention of early reproductive losses

    Directory of Open Access Journals (Sweden)

    Tebelev В. G.

    2011-09-01

    Full Text Available The literature on principal causes of early abortions and ways of treatment in the first trimester was studied. Reproductive losses in the first trimester were found out to be the most active because of 5 main groups of reasons. In each group the therapeutic way of abortion was considered

  1. Principals' Leadership Styles and Teachers' Motivation to Duty in ...

    African Journals Online (AJOL)

    This study was aimed at articulating principals' leadership styles and teachers' motivation to duty in Cross River State, Nigeria. Discussions have been focused on motivation of teachers to duty, and how leadership styles can enhance goal achievement and performance on the part of the teacher. Two research hypotheses ...

  2. Inadvertent Exemplars: Life History Portraits of Two Socially Just Principals

    Science.gov (United States)

    Scanlan, Martin

    2012-01-01

    This study creates life history portraits of two White middle-class native-English-speaking principals demonstrating commitments to social justice in their work in public elementary schools serving disproportionately high populations of students who are marginalized by poverty, race, and linguistic heritage. Through self-reported life histories of…

  3. PCovR: An R Package for Principal Covariates Regression

    NARCIS (Netherlands)

    Vervloet, Marlies; Kiers, Henk A L; Van den Noordgate, Wim; Ceulemans, Eva

    In this article, we present PCovR, an R package for performing principal covariates regression (PCovR; De Jong and Kiers 1992). PCovR was developed for analyzing regression data with many and/or highly collinear predictor variables. The method simultaneously reduces the predictor variables to a

  4. Hidden symmetries of the Principal Chiral Model unveiled

    International Nuclear Information System (INIS)

    Devchand, C.; Schiff, J.

    1996-12-01

    By relating the two-dimensional U(N) Principal Chiral Model to a Simple linear system we obtain a free-field parametrization of solutions. Obvious symmetry transformations on the free-field data give symmetries of the model. In this way all known 'hidden symmetries' and Baecklund transformations, as well as a host of new symmetries, arise. (author). 21 refs

  5. Principal Component Analysis: Most Favourite Tool in Chemometrics

    Indian Academy of Sciences (India)

    Abstract. Principal component analysis (PCA) is the most commonlyused chemometric technique. It is an unsupervised patternrecognition technique. PCA has found applications in chemistry,biology, medicine and economics. The present work attemptsto understand how PCA work and how can we interpretits results.

  6. 266 The Principals' and Teacher Counsellors' Perception of the ...

    African Journals Online (AJOL)

    FIRST LADY

    2011-01-18

    Jan 18, 2011 ... Karangu, Githua N. - Kagumo Teachers College, Kathuri, Nephat J.,. Egerton University, Kenya. Muola ... It was concluded that, although principals and teacher counsellors understood what is required for ... effective counselling, they have not done much to ensure the success of the programme. In order to ...

  7. Study of Characters in Story of School Principal (Modir Madrese

    Directory of Open Access Journals (Sweden)

    Ghadamzli Sarrami

    2013-04-01

    Full Text Available  Abstract It is concluded from the story that the reader to be briefed on the writer that he is fully aware of the education system process, furthermore it signifies that the inefficiency and distortion virtually experienced in the field of education affect the life cycle of the author as well.  Modir Madrese or School Principal is a fiction composed by Jalale Aleahmad a writer with genre of third person addressee, he narrates the biography of a teacher that he got tired of his job therefore he got his mind to assume the post of school principal, he reached to the favorite post by bribery as a result the previous teacher turned to school principal, the school situated at the slope of mountain.  The principal encountered with seven teachers, a janitor and 235 student who were mostly poor, geographical status, hygienic Services, yard, pond and school insufficient facilities which outlined as major shortcomings in the story.  Cognizance of students` parents, local council and establishment of school and home association, pornographies carried by a student, injury of 4th grade class teacher by car of an American citizen, jail of 3 grade class teacher due to sympathy toward socialists, appearing the accountant of education dept at the school asking for bribery and finally sexual scandal by 5th grade student counted as the major parts of the story , the whole incidences forced the principal to resign.  The current story represented in three perspectives like prose, simplicity and motive.  Motive signifies the text of story in social style it means realism fad while the prose depicts soft and colloquial by contribution of simile, explanations, proverbs and folkloric idioms, the stressed discourses, sarcasms and mockery including intensive and expressive prose manifested by representation of samples drawn out from the text.  The prominent part of the criticism revealed by analysis of story characters, as a result criticism of

  8. Study of Characters in Story of School Principal (Modir Madrese

    Directory of Open Access Journals (Sweden)

    Ghadamzli Sarrami

    2013-05-01

    Full Text Available Abstract It is concluded from the story that the reader to be briefed on the writer that he is fully aware of the education system process, furthermore it signifies that the inefficiency and distortion virtually experienced in the field of education affect the life cycle of the author as well.  Modir Madrese or School Principal is a fiction composed by Jalale Aleahmad a writer with genre of third person addressee, he narrates the biography of a teacher that he got tired of his job therefore he got his mind to assume the post of school principal, he reached to the favorite post by bribery as a result the previous teacher turned to school principal, the school situated at the slope of mountain.  The principal encountered with seven teachers, a janitor and 235 student who were mostly poor, geographical status, hygienic Services, yard, pond and school insufficient facilities which outlined as major shortcomings in the story.  Cognizance of students` parents, local council and establishment of school and home association, pornographies carried by a student, injury of 4th grade class teacher by car of an American citizen, jail of 3 grade class teacher due to sympathy toward socialists, appearing the accountant of education dept at the school asking for bribery and finally sexual scandal by 5th grade student counted as the major parts of the story , the whole incidences forced the principal to resign.  The current story represented in three perspectives like prose, simplicity and motive.  Motive signifies the text of story in social style it means realism fad while the prose depicts soft and colloquial by contribution of simile, explanations, proverbs and folkloric idioms, the stressed discourses, sarcasms and mockery including intensive and expressive prose manifested by representation of samples drawn out from the text.  The prominent part of the criticism revealed by analysis of story characters, as a result criticism of individual characters

  9. Study of Characters in Story of School Principal (Modir Madrese

    Directory of Open Access Journals (Sweden)

    Dr Ghadamzli Sarrami , Mohammad Moghiseh

    2013-01-01

    Full Text Available It is concluded from the story that the reader to be briefed on the writer that he is fully aware of the education system process, furthermore it signifies that the inefficiency and distortion virtually experienced in the field of education affect the life cycle of the author as well. Modir Madrese or School Principal is a fiction composed by Jalale Aleahmad a writer with genre of third person addressee, he narrates the biography of a teacher that he got tired of his job therefore he got his mind to assume the post of school principal, he reached to the favorite post by bribery as a result the previous teacher turned to school principal, the school situated at the slope of mountain. The principal encountered with seven teachers, a janitor and 235 student who were mostly poor, geographical status, hygienic Services, yard, pond and school insufficient facilities which outlined as major shortcomings in the story. Cognizance of students` parents, local council and establishment of school and home association, pornographies carried by a student, injury of 4th grade class teacher by car of an American citizen, jail of 3 grade class teacher due to sympathy toward socialists, appearing the accountant of education dept at the school asking for bribery and finally sexual scandal by 5th grade student counted as the major parts of the story , the whole incidences forced the principal to resign. The current story represented in three perspectives like prose, simplicity and motive. Motive signifies the text of story in social style it means realism fad while the prose depicts soft and colloquial by contribution of simile, explanations, proverbs and folkloric idioms, the stressed discourses, sarcasms and mockery including intensive and expressive prose manifested by representation of samples drawn out from the text. The prominent part of the criticism revealed by analysis of story characters, as a result criticism of individual characters demonstrate symbol of

  10. PEMBUATAN PERANGKAT LUNAK PENGENALAN WAJAH MENGGUNAKAN PRINCIPAL COMPONENTS ANALYSIS

    Directory of Open Access Journals (Sweden)

    Kartika Gunadi

    2001-01-01

    Full Text Available Face recognition is one of many important researches, and today, many applications have implemented it. Through development of techniques like Principal Components Analysis (PCA, computers can now outperform human in many face recognition tasks, particularly those in which large database of faces must be searched. Principal Components Analysis was used to reduce facial image dimension into fewer variables, which are easier to observe and handle. Those variables then fed into artificial neural networks using backpropagation method to recognise the given facial image. The test results show that PCA can provide high face recognition accuracy. For the training faces, a correct identification of 100% could be obtained. From some of network combinations that have been tested, a best average correct identification of 91,11% could be obtained for the test faces while the worst average result is 46,67 % correct identification Abstract in Bahasa Indonesia : Pengenalan wajah manusia merupakan salah satu bidang penelitian yang penting, dan dewasa ini banyak aplikasi yang dapat menerapkannya. Melalui pengembangan suatu teknik seperti Principal Components Analysis (PCA, komputer sekarang dapat melebihi kemampuan otak manusia dalam berbagai tugas pengenalan wajah, terutama tugas-tugas yang membutuhkan pencarian pada database wajah yang besar. Principal Components Analysis digunakan untuk mereduksi dimensi gambar wajah sehingga menghasilkan variabel yang lebih sedikit yang lebih mudah untuk diobsevasi dan ditangani. Hasil yang diperoleh kemudian akan dimasukkan ke suatu jaringan saraf tiruan dengan metode Backpropagation untuk mengenali gambar wajah yang telah diinputkan ke dalam sistem. Hasil pengujian sistem menunjukkan bahwa penggunaan PCA untuk pengenalan wajah dapat memberikan tingkat akurasi yang cukup tinggi. Untuk gambar wajah yang diikutsertakankan dalam latihan, dapat diperoleh 100% identifikasi yang benar. Dari beberapa kombinasi jaringan yang

  11. What Are the Different Types of Principals across the United States? A Latent Class Analysis of Principal Perception of Leadership

    Science.gov (United States)

    Urick, Angela; Bowers, Alex J.

    2014-01-01

    Purpose: Effective styles of principal leadership can help address multiple issues in struggling schools, such as low student achievement and high rates of teacher attrition. Although the literature has nominated certain "idealized" leadership styles as being more or less effective, such as transformational, instructional, and shared…

  12. The Principals and Practice of Distributed High Throughput Computing

    CERN Multimedia

    CERN. Geneva

    2016-01-01

    The potential of Distributed Processing Systems to deliver computing capabilities with qualities ranging from high availability and reliability to easy expansion in functionality and capacity were recognized and formalized in the 1970’s. For more three decade these principals Distributed Computing guided the development of the HTCondor resource and job management system. The widely adopted suite of software tools offered by HTCondor are based on novel distributed computing technologies and are driven by the evolving needs of High Throughput scientific applications. We will review the principals that underpin our work, the distributed computing frameworks and technologies we developed and the lessons we learned from delivering effective and dependable software tools in an ever changing landscape computing technologies and needs that range today from a desktop computer to tens of thousands of cores offered by commercial clouds. About the speaker Miron Livny received a B.Sc. degree in Physics and Mat...

  13. Improved pulsar timing via principal component mode tracking

    Science.gov (United States)

    Lin, Hsiu-Hsien; Masui, Kiyoshi; Pen, Ue-Li; Peterson, Jeffrey B.

    2018-03-01

    We present a principal component analysis method that tracks and compensates for short-time-scale variability in pulsar profiles, with a goal of improving pulsar timing precision. We couple this with a fast likelihood technique for determining pulse time of arrival, marginalizing over the principal component amplitudes. This allows accurate estimation of timing errors in the presence of pulsar variability. We apply the algorithm to the slow pulsar PSR J2139+0040 using an archived set of untargeted raster-scan observations at arbitrary epochs across four years, obtaining an improved timing solution. The method permits accurate pulsar timing in data sets with short contiguous on-source observations, opening opportunities for commensality between pulsar timing and mapping surveys.

  14. Fast principal component analysis for stacking seismic data

    Science.gov (United States)

    Wu, Juan; Bai, Min

    2018-04-01

    Stacking seismic data plays an indispensable role in many steps of the seismic data processing and imaging workflow. Optimal stacking of seismic data can help mitigate seismic noise and enhance the principal components to a great extent. Traditional average-based seismic stacking methods cannot obtain optimal performance when the ambient noise is extremely strong. We propose a principal component analysis (PCA) algorithm for stacking seismic data without being sensitive to noise level. Considering the computational bottleneck of the classic PCA algorithm in processing massive seismic data, we propose an efficient PCA algorithm to make the proposed method readily applicable for industrial applications. Two numerically designed examples and one real seismic data are used to demonstrate the performance of the presented method.

  15. Principal Component Analysis - A Powerful Tool in Computing Marketing Information

    Directory of Open Access Journals (Sweden)

    Constantin C.

    2014-12-01

    Full Text Available This paper is about an instrumental research regarding a powerful multivariate data analysis method which can be used by the researchers in order to obtain valuable information for decision makers that need to solve the marketing problem a company face with. The literature stresses the need to avoid the multicollinearity phenomenon in multivariate analysis and the features of Principal Component Analysis (PCA in reducing the number of variables that could be correlated with each other to a small number of principal components that are uncorrelated. In this respect, the paper presents step-by-step the process of applying the PCA in marketing research when we use a large number of variables that naturally are collinear.

  16. Principal parameters of classical multiply charged ion sources

    International Nuclear Information System (INIS)

    Winter, H.; Wolf, B.H.

    1974-01-01

    A review is given of the operational principles of classical multiply charged ion sources (operating sources for intense beams of multiply charged ions using discharge plasmas; MCIS). The fractional rates of creation of multiply charged ions in MCIS plasmas cannot be deduced from the discharge parameters in a simple manner; they depend essentially on three principal parameters, the density and energy distribution of the ionizing electrons, and the confinement time of ions in the ionization space. Simple discharge models were used to find relations between principal parameters, and results of model calculations are compared to actually measured charge state density distributions of extracted ions. Details of processes which determine the energy distribution of ionizing electrons (heating effects), confinement times of ions (instabilities), and some technical aspects of classical MCIS (cathodes, surface processes, conditioning, life time) are discussed

  17. On Harder–Narasimhan reductions for Higgs principal bundles

    Indian Academy of Sciences (India)

    (2) G stands for a connected reductive algebraic group (i.e. for the linear algebraic group. G, unipotent radical of G, ... bundle E on X. We now recall some facts which we need in our work. (1) Let E be a principal ..... Now we need to check the second condition in the definition of the Higgs H–N reduction. Let B be a Borel ...

  18. Transformational Leadership and Globalization: Attitudes of School Principals in Kuwait

    OpenAIRE

    Alsaeedi, F.; Male, T.

    2013-01-01

    The study explores the attitudes of a sample of school principals in a Kuwaiti local authority towards the need for transformational leadership, the use of its behaviours, whether these school leaders are ready to behave in diverse ways or whether there are barriers that prevent them from acting in such a manner. The findings of this study demonstrate that the participants agreed on the need for transformational leadership and had positive attitudes towards its behaviours. Although the partic...

  19. The Atiyah bundle and connections on a principal bundle

    Indian Academy of Sciences (India)

    be the fiber bundle constructed as in (1.1) for the universal principal G-bundle. In a work in progress, we hope to show that the universal G-connection can be realized as a fiber bundle over C(EG). Turning this around, we hope to get an alternative construction of the universal G-connection. Also, this approach may yield a ...

  20. Conseiller principal en communications (h/f) | CRDI - Centre de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Résumé des fonctions Le conseiller principal en communications est chargé de la gestion des relations publiques de telecentre.org. Il est également responsable de l'élaboration et de la gestion des principales stratégies de communication et de mise en commun des connaissances, de même que des grandes stratégies ...

  1. Palm-vein classification based on principal orientation features.

    Directory of Open Access Journals (Sweden)

    Yujia Zhou

    Full Text Available Personal recognition using palm-vein patterns has emerged as a promising alternative for human recognition because of its uniqueness, stability, live body identification, flexibility, and difficulty to cheat. With the expanding application of palm-vein pattern recognition, the corresponding growth of the database has resulted in a long response time. To shorten the response time of identification, this paper proposes a simple and useful classification for palm-vein identification based on principal direction features. In the registration process, the Gaussian-Radon transform is adopted to extract the orientation matrix and then compute the principal direction of a palm-vein image based on the orientation matrix. The database can be classified into six bins based on the value of the principal direction. In the identification process, the principal direction of the test sample is first extracted to ascertain the corresponding bin. One-by-one matching with the training samples is then performed in the bin. To improve recognition efficiency while maintaining better recognition accuracy, two neighborhood bins of the corresponding bin are continuously searched to identify the input palm-vein image. Evaluation experiments are conducted on three different databases, namely, PolyU, CASIA, and the database of this study. Experimental results show that the searching range of one test sample in PolyU, CASIA and our database by the proposed method for palm-vein identification can be reduced to 14.29%, 14.50%, and 14.28%, with retrieval accuracy of 96.67%, 96.00%, and 97.71%, respectively. With 10,000 training samples in the database, the execution time of the identification process by the traditional method is 18.56 s, while that by the proposed approach is 3.16 s. The experimental results confirm that the proposed approach is more efficient than the traditional method, especially for a large database.

  2. School choice : challenge to Sharpeville public primary school principals

    OpenAIRE

    2012-01-01

    M.Ed. This qualitative phenomenological study focuses on school choice as challenge to principals of Sharpeville public primary schools. Different aspects of these choices are explored. School choice is an important component of parental involvement in the education of their children. Parents and learners tend to be open about their right through the support of the Schools Act 84 of 1996. You may not discriminate on the basis of race trough the language policy at your school. This means th...

  3. Research on Air Quality Evaluation based on Principal Component Analysis

    Science.gov (United States)

    Wang, Xing; Wang, Zilin; Guo, Min; Chen, Wei; Zhang, Huan

    2018-01-01

    Economic growth has led to environmental capacity decline and the deterioration of air quality. Air quality evaluation as a fundamental of environmental monitoring and air pollution control has become increasingly important. Based on the principal component analysis (PCA), this paper evaluates the air quality of a large city in Beijing-Tianjin-Hebei Area in recent 10 years and identifies influencing factors, in order to provide reference to air quality management and air pollution control.

  4. Schematic Harder–Narasimhan stratification for families of principal ...

    Indian Academy of Sciences (India)

    Abstract. Let G be a reductive algebraic group over a field k of characteristic zero, let X → S be a smooth projective family of curves over k, and let E be a principal G bundle on X. The main result of this note is that for each Harder–Narasimhan type τ there exists a locally closed subscheme Sτ (E) of S which satisfies the ...

  5. Evaluation of Principal Performance in Public and Private Sector Schools

    OpenAIRE

    Akhtar, Iram; Cheema, Khaliq Ur Rehman

    2013-01-01

    The purpose of this study is to analyze the performance in context of student learning of principals in public sector and private sector schools. For this purpose five main domains were used as variables are: 1) teaching, learning and professional growth, 2) Inter-personal and inter-professional relationship and collaboration, 3) Parent and faculty involvement in decision making, 4) Vision and values, 5) Innovation and change. The population for this study was selected randomly. The target sa...

  6. Fire experiences: principal lessons learned, application in PWR power plants

    International Nuclear Information System (INIS)

    Schoemacker, M.

    1984-01-01

    The article reviews the principal design rules to be borne in mind for PWR nuclear units installation. These rule takes into account: the specific character of materials involved (safety aspect for nuclear construction), experience acquired as a result of fires in EDF production units, and the results obtained from tests carried out by the EDF at Fort de Chelles between 1980 and 1982, especially in the field of PVC cables [fr

  7. Principal Component Analysis (Pca) Dan Aplikasinya Dengan Spss

    OpenAIRE

    Bus Umar, Hermita

    2009-01-01

    PCA (Principal Component Analysis ) are statistical techniques applied to a single set of variables when the researcher is interested in discovering which variables in the setform coherent subset that are relativity independent of one another.Variables that are correlated with one another but largely independent of other subset of variables are combined into factors. The Coals of PCA to which each variables is explained by each dimension. Step in PCA include selecting and mean measuring a set...

  8. Validation in Principal Components Analysis Applied to EEG Data

    Directory of Open Access Journals (Sweden)

    João Carlos G. D. Costa

    2014-01-01

    Full Text Available The well-known multivariate technique Principal Components Analysis (PCA is usually applied to a sample, and so component scores are subjected to sampling variability. However, few studies address their stability, an important topic when the sample size is small. This work presents three validation procedures applied to PCA, based on confidence regions generated by a variant of a nonparametric bootstrap called the partial bootstrap: (i the assessment of PC scores variability by the spread and overlapping of “confidence regions” plotted around these scores; (ii the use of the confidence regions centroids as a validation set; and (iii the definition of the number of nontrivial axes to be retained for analysis. The methods were applied to EEG data collected during a postural control protocol with twenty-four volunteers. Two axes were retained for analysis, with 91.6% of explained variance. Results showed that the area of the confidence regions provided useful insights on the variability of scores and suggested that some subjects were not distinguishable from others, which was not evident from the principal planes. In addition, potential outliers, initially suggested by an analysis of the first principal plane, could not be confirmed by the confidence regions.

  9. Spectral decomposition of asteroid Itokawa based on principal component analysis

    Science.gov (United States)

    Koga, Sumire C.; Sugita, Seiji; Kamata, Shunichi; Ishiguro, Masateru; Hiroi, Takahiro; Tatsumi, Eri; Sasaki, Sho

    2018-01-01

    The heliocentric stratification of asteroid spectral types may hold important information on the early evolution of the Solar System. Asteroid spectral taxonomy is based largely on principal component analysis. However, how the surface properties of asteroids, such as the composition and age, are projected in the principal-component (PC) space is not understood well. We decompose multi-band disk-resolved visible spectra of the Itokawa surface with principal component analysis (PCA) in comparison with main-belt asteroids. The obtained distribution of Itokawa spectra projected in the PC space of main-belt asteroids follows a linear trend linking the Q-type and S-type regions and is consistent with the results of space-weathering experiments on ordinary chondrites and olivine, suggesting that this trend may be a space-weathering-induced spectral evolution track for S-type asteroids. Comparison with space-weathering experiments also yield a short average surface age (component of Itokawa surface spectra is consistent with spectral change due to space weathering and that the spatial variation in the degree of space weathering is very large (a factor of three in surface age), which would strongly suggest the presence of strong regional/local resurfacing process(es) on this small asteroid.

  10. Extraction of Independent Structural Images for Principal Component Thermography

    Directory of Open Access Journals (Sweden)

    Dmitry Gavrilov

    2018-03-01

    Full Text Available Thermography is a powerful tool for non-destructive testing of a wide range of materials. Thermography has a number of approaches differing in both experiment setup and the way the collected data are processed. Among such approaches is the Principal Component Thermography (PCT method, which is based on the statistical processing of raw thermal images collected by thermal camera. The processed images (principal components or empirical orthogonal functions form an orthonormal basis, and often look like a superposition of all possible structural features found in the object under inspection—i.e., surface heating non-uniformity, internal defects and material structure. At the same time, from practical point of view it is desirable to have images representing independent structural features. The work presented in this paper proposes an approach for separation of independent image patterns (archetypes from a set of principal component images. The approach is demonstrated in the application of inspection of composite materials as well as the non-invasive analysis of works of art.

  11. Principal Hugonuot and decaying shock Hugoniot on silicates

    Science.gov (United States)

    Sekine, Toshimori; Ozaki, Norimasa; Kodama, Ryosuke; Uneda, Yuhei; Sato, Tomoko; Miyanishi, Kohei; Nishikawa, Toyohito; Toshimori Sekine Collaboration; Norimasa Ozaki Collaboration

    2017-06-01

    Laser shock experiments can achieve warm dense matter conditions applicable to the formation of planets and interior of large planets. The techniques of velocity interferometer system for ant reflector (VISAR) and streaked optical pyrometer (SOP) are used to observe the laser-shocked materials above 200 GPa, where the shock fronts in most materials become effective reflectors. The VISAR and SOP profiles give shock velocity and temperature directly if the shock structure is one-wave. In the measurement of principal Hugoniot we need one more parameter such as particle velocity that will be determined in a simultaneous measurement of a reference by the impedance match method. In decaying shock measurements, shock velocity and temperature of a sample are monitored simultaneously and pressure will be read using the principal Hugonot relation available as known experimentally or predicted. If two-wave structures appear at phase transition, the analyses are complicated. Therefore we must be careful in applying the decaying shock data to planetary problems. I summarize them by comparing the difference between the principal and decaying Hugoniots of silicates.

  12. Selecting the Number of Principal Components in Functional Data

    KAUST Repository

    Li, Yehua

    2013-12-01

    Functional principal component analysis (FPCA) has become the most widely used dimension reduction tool for functional data analysis. We consider functional data measured at random, subject-specific time points, contaminated with measurement error, allowing for both sparse and dense functional data, and propose novel information criteria to select the number of principal component in such data. We propose a Bayesian information criterion based on marginal modeling that can consistently select the number of principal components for both sparse and dense functional data. For dense functional data, we also develop an Akaike information criterion based on the expected Kullback-Leibler information under a Gaussian assumption. In connecting with the time series literature, we also consider a class of information criteria proposed for factor analysis of multivariate time series and show that they are still consistent for dense functional data, if a prescribed undersmoothing scheme is undertaken in the FPCA algorithm. We perform intensive simulation studies and show that the proposed information criteria vastly outperform existing methods for this type of data. Surprisingly, our empirical evidence shows that our information criteria proposed for dense functional data also perform well for sparse functional data. An empirical example using colon carcinogenesis data is also provided to illustrate the results. Supplementary materials for this article are available online. © 2013 American Statistical Association.

  13. School Principals' Perceptions of Ethically Just Responses to a Student Sexting Vignette: Severity of Administrator Response, Principal Personality, and Offender Gender and Race

    Science.gov (United States)

    Moriarty, Margaret E.

    2012-01-01

    This mixed-methods study was designed to determine how principals perceived the ethicality of sanctions for students engaged in sexting behavior relative to the race/ethnicity and gender of the student. Personality traits of the principals were surveyed to determine if Openness and/or Conscientiousness would predict principal response. Sexting is…

  14. Learning Leaders: How Do Award-Winning Principals Learn and Grow? Are There Commonalities in the Professional Development Practices of NAESP/NASSP Award-Winning Principals?

    Science.gov (United States)

    Hansen, Mark

    2013-01-01

    The role a principal plays in school improvement has evolved over time. The transition from principal as manager to principal as instructional leader began with and was driven in large part by the effective schools movement of the 1970's and 1980's (Hallinger, 2003; Zigarelli, 1996). Since the inception of NCLB in 2001, the leader's role in…

  15. A View from the Principal's Office: A Grounded-Theory Exploration of Principals' Perceptions of Non-Academic Barriers to Learning--Implications for School Social Work

    Science.gov (United States)

    Prather, JoNataye Arnitra

    2010-01-01

    The importance of the principal has been found to be a critical factor in student and school success. School principal responsibilities traditionally encompass operations and management. However, many principals are unable to fulfill these expectations because of students' social and behavioral issues. Consequently, this qualitative study explored…

  16. The nuclear cancerology: finally in the yard of the men in high places; La cancerologie nucleaire: enfin dans la cour des grands

    Energy Technology Data Exchange (ETDEWEB)

    Chatal, J.F. [Nantes Univ., UMR 601 Inserm, 44 (France)

    2005-11-15

    From the beginning of the sixties nuclear medicine expanded in numerous medical specialities, principally in cardiology and cancerology. The development of PET constituted a technological revolution. Improvement in radioimmunotherapy, new radiopharmaceuticals, development of vectorized radiotherapy are such steps that give performances to nuclear cancerology. (N.C.)

  17. Generalized principal resonance in oscillatory systems of second order; Resonancia principal generalizada en sistemas oscilatorios de segundo orden

    Energy Technology Data Exchange (ETDEWEB)

    Munoz Aguirre, E. [Universidad Autonoma de Puebla, Oaxaca (Mexico); Alexandrov, V. V. [Benemerita Universidad Autonoma de Puebla, Puebla (Mexico)

    2001-02-01

    This paper will describe the generalized principal resonance of systems as described by the second order of ordinary differential equations and proved by the Pontriaguin maximal principle to coincide with the lengthened solution of an external problem of the same system. The results are verified in special cases of general resonance and parametric resonance for the Mathieu equation. [Spanish] En el presente articulo se estudia la resonancia principal generalizada para sistemas descritos por ecuaciones diferenciales ordinarias de segundo orden y se demuestra con ayuda del principio del maximo de Pontriaguin, la coincidencia de esta con la solucion prolongada de un problema extremal para el mismo sistema. Ademas se verifican estos resultados en los casos particulares de resonancia general y resonancia parametrica para la ecuacion de Mathieu.

  18. Conformity of nuclear construction codes with the requirements of the French order dated December 12, 2005 related to nuclear pressure equipment; Conformite des codes de construction nucleaires avec les exigences de l'arrete du 12 decembre 2005 relatif aux equipements sous pression nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    Grandemange, J.M.; Renaut, P. [Areva-NP, Tour AREVA, 92084 - Paris La Defense cedex, (France); Paris, D. [EDF-Ceidre 2 rue Ampere - 93206 SAINT-DENIS Cedex (France); Faidy, C. [EDF-Septen 12/14, Avenue Dutrievoz 69628 Villeurbanne Cedex (France)

    2007-07-01

    The French Decree dated December 13, 1999 transposing the Pressure Equipment Directive (PED) has replaced the fundamental texts on which up to now the regulation for pressure equipment important for the safety of nuclear reactors was also founded. By a Ministerial Order - called 'ESPN Order' - dated December 12, 2005, a new regulation has been issued for nuclear pressure equipment. This text makes reference to the Decree transposing the PED while completing these provisions by supplementary requirements having the objective to provide a very high level of integrity guarantee for equipments which are the most important for safety, and to cover the prevention of radioactive release risks. These regulatory evolutions are presented in the Plenary Session of the ESOPE conference. Referencing the Decree and thus the PED, and including specific provisions, the Ministerial Order implies that the Manufacturers update their documents and, if necessary, their prescriptions in the following two domains: - that of the conformity of Codes and Standards used, generally inspired from the ASME Code Section III, with the essential safety requirements of the PED, - that of the respect of the complementary provisions brought by the ESPN Order. This paper presents the more significant conclusions of this work and the resulting amendments of the RCC-M Code, introduced by the 2007 addendum to that Code. The analysis will lead to specify the same type of complementary requirements to Code when a manufacturer wishes to use the German KTA Rules or the ASME Code Section III. (authors) [French] Le decret du 13 decembre 1999 transposant la directive europeenne (DESP) relative aux equipements sous pression a remplace les textes fondamentaux sur lesquels se fondait egalement jusque la la reglementation des appareils a pression importants pour la surete des reacteurs nucleaires. Par arrete - dit 'arrete ESPN' - du 12 decembre 2005, une nouvelle reglementation a ete dictee. Ce

  19. The Impact of Pay Satisfaction and School Achievement on High School Principals' Turnover Intentions

    Science.gov (United States)

    Tran, Henry

    2017-01-01

    In recent years, a principal supply shortage crisis has emerged in the USA. This problem has been exacerbated by an increase in principal departures, which has been found to be negatively related to school outcomes. While research exists on several determinants of principal turnover, any examination of the relationship between principals'…

  20. Twins and Kindergarten Separation: Divergent Beliefs of Principals, Teachers, Parents, and Twins

    Science.gov (United States)

    Gordon, Lynn Melby

    2015-01-01

    Should principals enforce mandatory separation of twins in kindergarten? Do school separation beliefs of principals differ from those of teachers, parents of twins, and twins themselves? This survey questioned 131 elementary principals, 54 kindergarten teachers, 201 parents of twins, and 112 twins. A majority of principals (71%) believed that…

  1. Principal Perceptions of the Effectiveness of University Educational Leadership Preparation and Professional Learning

    Science.gov (United States)

    Johnson, Arvin D.

    2016-01-01

    Principals and assistant principals currently serving in Florida and Georgia school districts were surveyed about their perceptions of university educational leadership preparation and professional learning. The results revealed that many principals and assistant principals agreed that university educational leadership preparation programs…

  2. 26 CFR 301.6226(a)-1 - Principal place of business of partnership.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 18 2010-04-01 2010-04-01 false Principal place of business of partnership. 301... Principal place of business of partnership. (a) In general. The principal place of a partnership's business... partnership items may be filed is its principal place of business as of the date the petition is filed. (b...

  3. Perceptions of School Principals on Participation in Professional Learning Communities as Job-Embedded Learning

    Science.gov (United States)

    Gaudioso, Jennifer A.

    2017-01-01

    Perceptions of School Principals on Participation in Professional Learning Communities as Job-Embedded Learning Jennifer Gaudioso Principal Professional Learning Communities (PPLCs) have emerged as a vehicle for professional development of principals, but there is little research on how principals experience PPLCs or how districts can support…

  4. Leadership Standards in Action: The School Principal as Servant-Leader

    Science.gov (United States)

    Brumley, Cade

    2011-01-01

    "Leadership Standards In Action: The School Principal as Servant-Leader" is a powerful resource for aspiring principals, practicing principals, district leadership, and university faculty. The book responsibly unpacks the metaphor of principal as servant leader to the school's people and purpose. As a framework, the six ISLLC Standards of…

  5. Ethical Decision-Making by High School Principals in Evaluating Teachers

    Science.gov (United States)

    Bakopoulos, Fotini

    2013-01-01

    The purpose of this study was to examine the ethical beliefs and preparation practices of high school principals when making decisions on the evaluation of teacher performance for retention and/or tenure. The participants consisted of a total of 10 high school principals, associate principals, and assistant principals who evaluate the performance…

  6. Intégration des principes de l'accès au savoir (A2K) aux Principes ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Les Principes directeurs s'appliquent à huit domaines touchant la protection du consommateur, ou droits : le droit à la satisfaction des besoins fondamentaux, à la sécurité, au choix, à l'information, à des programmes d'éducation, à des voies de recours, à la représentation et à un environnement sain. Bien qu'ils n'aient pas ...

  7. Agriculture et changement climatique: enjeux et solutions

    Directory of Open Access Journals (Sweden)

    Mergeai, G.

    2015-01-01

    Full Text Available Agriculture and Climate Change: Challenges and Solutions. According to the latest report from the Intergovernmental Panel on Climate Change (IPCC, climate change is already having a significant impact on agriculture. Several models highlight the increasingly negative effects of increased temperatures on crop yields and livestock farming in developing countries. These impacts can be caused by negative physiological effects for plants and animals, which result from higher temperatures or the proliferation of pests and diseases caused by the latter. The increased number of extreme weather events, especially floods, and changing precipitation patterns are linked to climate changes. These factors dramatically affect the crop production potential of agricultural land. Populations in the developing world, which are already vulnerable and exposed to food insecurity, are the most seriously affected. In many countries in the southern hemisphere, agriculture actually represents the main source of income for a major proportion of the active population. Combined with increased demographic pressure, climate changes therefore help to exacerbate the pressure on global food systems. In addition, it should be noted that agriculture also plays a key role in the reduction of greenhouse gas emissions and is therefore at the heart of a variety of complex issues. In light of these facts, it is essential that we make every effort to identify solutions, aimed at adapting to climate changes and alleviating the contribution of certain agricultural practices to the latter, in order to respond to all the challenges that they create. This involves reinforcing research initiatives aimed at understanding and quantifying the problems, while identifying steps that need to be taken in order to limit these problems. It also involves lobbying for appropriate policies to be put into place, based on the results of this research. Last but not least, it involves developing field projects in order to identify and promote appropriate farming practices and create conditions that will help them become more widespread. With this in mind, we welcome the Montpellier Declaration initiative (http://csa2015.cirad.fr, which was developed at the Third Global Science Conference on Climate Smart Agriculture (Climate Smart Agriculture 2015 that was held in this city on 16-18 March 2015. At this event, over 600 research scientists and 150 stakeholders/policy makers - from 75 countries and 5 continents – confirmed that climate smart agriculture has become a benchmark, which creates synergies and may lead to innovative and global solutions at local, regional and international level. The participants also confirmed that climate smart solutions exist and could become a reality if the conditions and public policies lend themselves to these solutions. We encourage all readers of Tropicultura to learn more about the work completed at this conference, in order to understand issues linked to climate change and identify sources of inspiration, so that we can overcome the constraints that it imposes.

  8. Amenagements sportifs et developpement durable : Des enjeux ...

    African Journals Online (AJOL)

    Sur ces aspects, les métamorphoses de la proximité ou de l'inter culturalité des modèles sociaux, constituent sans doute, quelques lignes directrices que cette étude s'attache à appréhender pour cerner toute la problématique du développement durable d'une part et mener par ailleurs une réflexion globale sur ce qui doit ...

  9. Le djihadisme au Sahel : enjeux et perspectives

    African Journals Online (AJOL)

    veulent y instaurer un État (ou Califat) islamique (voir carte 1 supra) et y appliquer la Shari'a dans ce qu'elle a ... ces propos, elle aura lieu sous les États indépendants, et précisément à la faveur de leur démocratisation. ...... centrafricaine peuvent être tentés de l'étendre à toute la forêt équatoriale. Avec le nord du continent, ...

  10. Fondements du projet urbain ; enjeux et processus

    OpenAIRE

    Tabouret , René

    1989-01-01

    Ce rapport retrace l’émergence et la formalisation progressive du concept de projet urbain dans le cadre de l’Ecole d’Architecture de Strasbourg sur une décennie (1978-1988), à l’épreuve de projets contrastés (villes de Mulhouse, St Denis, Strasbourg) et de la participation au Seminario Internazionale de Arquitectura Contemporanea (sessions de Barcelone, Naples et Belfort). La projet urbain y est identifié comme ‘intervention dans le processus complexe de (trans)formation de la ville’ ; ceci ...

  11. Nuclear medicine; La medecine nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    Sibille, L. [Hopital Lapeyronie CHU Montpellier, Medecine Nucleaire, 34 - Montpellier (France); Nalda, E.; Collombier, L.; Kotzki, P.O.; Boudousq, V. [CHU de Nimes, Service de Medecine Nucleaire et de biophysique, 30 - Nimes (France)

    2011-05-15

    Nuclear medicine is a medical specialty using the properties of radioactivity. Radioactive markers associated with vectors are used as a tracer or radiopharmaceutical for diagnostic purposes and/or therapy. Since its birth more than half a century ago, it has become essential in the care of many patients, particularly in oncology. After some definitions, this paper presents the main nuclear techniques - imaging for diagnostic, radiopharmaceuticals as therapeutic agents, intra-operative detection, technique of radioimmunoassay - and the future of this field. (authors)

  12. Information sur les technologies nucleaires

    CERN Multimedia

    2002-01-01

    "La base Inis (International Nuclear Information System) de l'Agence Internationale d'Energie Atomique (IAEA) dispose desormais de liens vers les textes complets de documents internationaux" (1 paragraph).

  13. Nuclear fuels; Les combustibles nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2008-07-01

    The nuclear fuel is one of the key component of a nuclear reactor. Inside it, the fission reactions of heavy atoms, uranium and plutonium, take place. It is located in the core of the reactor, but also in the core of the whole nuclear system. Its design and properties influence the behaviour, the efficiency and the safety of the reactor. Even if it represents a weak share of the generated electricity cost, its proper use represents an important economic stake. Important improvements remain to be made to increase its residence time inside the reactor, to supply more energy, and to improve its robustness. Beyond the economical and safety considerations, strategical questions have to find an answer, like the use of plutonium, the management of resources and the management of nuclear wastes and real technological challenges have to be taken up. This monograph summarizes the existing knowledge about the nuclear fuel, its behaviour inside the reactor, its limits of use, and its R and D tracks. It illustrates also the researches in progress and presents some key results obtained recently. Content: 1 - Introduction; 2 - The fuel of water-cooled reactors: aspect, fabrication, behaviour of UO{sub 2} and MOX fuels inside the reactor, behaviour in loss of tightness situation, microscopic morphology of fuel ceramics and evolution under irradiation - migration and localisation of fission products in UOX and MOX matrices, modeling of fuels behaviour - modeling of defects and fission products in the UO{sub 2} ceramics by ab initio calculations, cladding and assembly materials, pellet-cladding interaction, advanced UO{sub 2} and MOX ceramics, mechanical behaviour of the fuel assembly, fuel during a loss of coolant accident, fuel during a reactivity accident, fuel during a serious accident, fuel management inside reactor cores, fuel cycle materials balance, long-term behaviour of the spent fuel, fuel of boiling water reactors; 3 - the fuel of liquid metal fast reactors: fast neutrons radiation-induced damages in structural materials, fuels and targets for the transmutation in FBR; 4 - the fuel of gas-cooled reactors: fuel particulates, behaviour under irradiation, mechanical modeling, the fuel for very high temperature reactors, the fuel for gas-cooled fast reactors; 5 - the fuel for research reactors; 6 - the Jules Horowitz reactor: a tool for the future fuel studies. (J.S.)

  14. Quality Aware Compression of Electrocardiogram Using Principal Component Analysis.

    Science.gov (United States)

    Gupta, Rajarshi

    2016-05-01

    Electrocardiogram (ECG) compression finds wide application in various patient monitoring purposes. Quality control in ECG compression ensures reconstruction quality and its clinical acceptance for diagnostic decision making. In this paper, a quality aware compression method of single lead ECG is described using principal component analysis (PCA). After pre-processing, beat extraction and PCA decomposition, two independent quality criteria, namely, bit rate control (BRC) or error control (EC) criteria were set to select optimal principal components, eigenvectors and their quantization level to achieve desired bit rate or error measure. The selected principal components and eigenvectors were finally compressed using a modified delta and Huffman encoder. The algorithms were validated with 32 sets of MIT Arrhythmia data and 60 normal and 30 sets of diagnostic ECG data from PTB Diagnostic ECG data ptbdb, all at 1 kHz sampling. For BRC with a CR threshold of 40, an average Compression Ratio (CR), percentage root mean squared difference normalized (PRDN) and maximum absolute error (MAE) of 50.74, 16.22 and 0.243 mV respectively were obtained. For EC with an upper limit of 5 % PRDN and 0.1 mV MAE, the average CR, PRDN and MAE of 9.48, 4.13 and 0.049 mV respectively were obtained. For mitdb data 117, the reconstruction quality could be preserved up to CR of 68.96 by extending the BRC threshold. The proposed method yields better results than recently published works on quality controlled ECG compression.

  15. Structure of the principal carotenoid pigment of Cellulomonas biazotea.

    Science.gov (United States)

    Weeks, O B; Montes, A R; Andrewes, A G

    1980-01-01

    The yellow-pigmented Cellulomonas biazotea, ATCC 486, contains a mixture of carotenoids. The principal compound is a decapreno carotenoid (C50H72O2) tentatively characterized as 2,2'-bis(4-hydroxy-3-methyl-2-butenyl)-gamma,gamma-carotene on the basis of electronic absorption, infrared, proton magnetic resonance, and mass spectrometries. The carotenoid is presumed to be identical to sarcinaxanthin from Sarcina lutea pro-synon. Micrococcus luteus and, therefore, is isomeric with decaprenoxanthin from Cellulomonas dehydrogenans. PMID:6245065

  16. Principal results of 'DEWAM' project implementation, Russian Federation

    International Nuclear Information System (INIS)

    Nechaev, A.F.

    2002-01-01

    This overview summarizes the key results of the four-year project 'Decontamination and Waste Management in the Course of Research Reactors Decommissioning' carried out within the framework of the IAEA's CRP 'Decommissioning Techniques for Research Reactors'. The project included two principal components: (1) info-analytical studies and development of a database system, and (2) research and development in the areas of decontamination and waste management technologies applicable to decommissioning. Details of the work are expounded in 29 publications and annual Progress Reports; the results of the study are used in corresponding university courses; and innovative technologies for radwaste processing and environmental restoration are planned to be introduced into practice. (author)

  17. Efficient training of multilayer perceptrons using principal component analysis

    International Nuclear Information System (INIS)

    Bunzmann, Christoph; Urbanczik, Robert; Biehl, Michael

    2005-01-01

    A training algorithm for multilayer perceptrons is discussed and studied in detail, which relates to the technique of principal component analysis. The latter is performed with respect to a correlation matrix computed from the example inputs and their target outputs. Typical properties of the training procedure are investigated by means of a statistical physics analysis in models of learning regression and classification tasks. We demonstrate that the procedure requires by far fewer examples for good generalization than traditional online training. For networks with a large number of hidden units we derive the training prescription which achieves, within our model, the optimal generalization behavior

  18. Da Livio a Machiavelli. Annibale e Scipione in "Principe", XVII

    Directory of Open Access Journals (Sweden)

    Jean-Jacques Marchand

    2016-06-01

    Full Text Available In the classical tradition (and especially in Livy’s work, Hannibal and Scipio are described as two generals who have confronted each other in a titanic struggle with alternate fortunes for the control of the Mediterranean. Focusing on the superiority of cruelty over pity for the safety of the state, in the seventeenth chapter of Il Principe Machiavelli contrasts the greater efficiency of Hannibal’s cruelty with Scipio’s mildness. This article examines the techniques of shifting, coagulation, and relocation adopted by Machiavelli in his approach to three passages from the Livian text which constitute the source of the chapter.

  19. Sparse principal component analysis in hyperspectral change detection

    DEFF Research Database (Denmark)

    Nielsen, Allan Aasbjerg; Larsen, Rasmus; Vestergaard, Jacob Schack

    2011-01-01

    This contribution deals with change detection by means of sparse principal component analysis (PCA) of simple differences of calibrated, bi-temporal HyMap data. Results show that if we retain only 15 nonzero loadings (out of 126) in the sparse PCA the resulting change scores appear visually very...... similar although the loadings are very different from their usual non-sparse counterparts. The choice of three wavelength regions as being most important for change detection demonstrates the feature selection capability of sparse PCA....

  20. Current aspects of the principal of protecting employees

    Directory of Open Access Journals (Sweden)

    Jovanović Predrag

    2011-01-01

    Full Text Available The principal of protecting employees is traditionally present in labor law. Particular categories of employees, also traditionally, enjoy special protection (young people, women, the disabled. However, the issue of protection of moral integrity of the employees has only recently been addressed. That makes the general principle of the protection of employees in labor relations very current, and it is from that perspective that this paper points out to certain standards of protection of employees in light of international, European and domestic law.