WorldWideScience

Sample records for climatique globale quels

  1. Global warming what are the challenges for Copenhagen?; Rechauffement climatique. Quels enjeux pour Copenhague?

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2010-07-01

    The Kyoto Protocol was adopted in 1997 and, following a long ratification process, went into effect in 2005. Under the Protocol, 200 countries have committed to reducing their greenhouse gas emissions (GHG) by 2012. What conclusions can we draw from developments thus far, as we await the December conference in Copenhagen to determine a follow-up to the Kyoto Protocol? The work of the Intergovernmental Panel on Climate Change (IPCC) has given us more accurate knowledge on global warming issues. In its latest report, published in 2007, the IPCC reveals that eleven of the past twelve years studied - 1995 to 2006 - were among the warmest yet recorded since 1850, when this type of data collection began. From 1906 to 2005, global temperatures rose by 0.74 deg. C, and the average rate of increase has more than doubled over the past fifty years. To help companies and countries achieve their GHG emissions reduction targets, the Kyoto Protocol provides for a carbon trading system based on carbon reduction credits (CRC), the exchange currency in a carbon credit market. When a company reduces its emissions below regulatory levels, it can have the 'excess' reduction certified and converted into carbon credits, which it can then sell to a company that has not yet reached its reduction targets. Japan has already used clean technologies and energy saving measures to achieve energy efficiency in the past. Its energy structure is fairly close to that of France, which has a 0% emissions goal. In Japan, nuclear power also accounts for a significant share of the electric power program. The Japanese government recently announced that it was increasing its carbon reduction goal from 6% to an ambitious 25%. China and the United States are the world's leading greenhouse gas emitters. When China ratified the Kyoto Protocol in 2002, it was considered to be a developing country and as such has no emissions reduction obligations. Since then, China has moved closer to the

  2. Changements climatiques au Maroc: quels systèmes de culture et quelles biotechnologies pour s’y adapter ?

    Directory of Open Access Journals (Sweden)

    Abdelhadi AIT HOUSSA

    2017-09-01

    Full Text Available A prospective study is presented on the probable impact of climate change on cropping and livestock systems in Morocco. According to field reports and taking into account the limits of such studies, the direct effect of global warming can lead (and this is already the case in other countries to a new varietal redistribution for the cold demanding species such as rosaceous. Apple cultivars such as the Golden group risk disappearing from the mountains to give way to others less cold demanding cultivars such as the Gala group. The banana and the avocado risk migrating to more continental regions while the olive and the citrus trees will move towards the foot of mountains. Global warming may also induce changes in livestock and cropping systems moving the drought boundary towards the center and north of the country. The arid would probably return to the semi-desert or desert space, the semi-arid would pass partly to the arid zone and the favorable Bour will be semi-arid. As a result to this change, we may expect a lack of water resource inducing an abandoning of grain crops in the arid stage for livestock. Also, we may expect a revising of the existing cropping systems within the rain-fed areas by introducing a little more Dry Farming and early cultivars. In the large irrigated perimeters, it would be necessary to exclude, due to the lack of water, the high water consuming crops such as rice and sugar cane for highly efficient and remunerative crops. Excessive drought predicted by some recent models also suggests a greater need for dams as soon as possible in order to take advantage of the rainy years with exceptional rainfall. On the other hand, it would also be necessary to optimize water management by moving rapidly towards drip irrigation, and by transferring water surplus to deficient areas. Even though the use of seawater as a resource for irrigation seems so far away, the advances in desalinization technology and cost will allow either large

  3. Quel futur pour les services écosystémiques de la forêt alpine dans un contexte de changement climatique ?

    Directory of Open Access Journals (Sweden)

    Benoît Courbaud

    2011-01-01

    Full Text Available La forêt de montagne produit de nombreux services écosystémiques qui vont être affectés par les changements climatiques. On attend une remontée des essences en altitude qui pourrait conduire à une diminution des résineux et des espèces du subalpin. Ces changements d’essences pourraient avoir un impact négatif sur la biodiversité et sur la production de bois d’œuvre. On observe cependant également une augmentation de la productivité favorable à la production de bois énergie et au moins temporairement de bois d’œuvre, ainsi qu’au stockage de carbone. Face à une augmentation possible des évènements climatiques extrêmes, les changements de végétation pourront être marqués par des épisodes de dépérissements, très négatifs pour la filière économique, la protection contre les risques naturels et la biodiversité. Le changement climatique affectera la forêt également de manière indirecte en augmentant la demande en énergie renouvelable et en stockage de carbone. Les incertitudes sur les prédictions de changements de végétation sont élevées, ce qui rend délicate la définition de stratégies d’adaptation de la gestion forestière. Une gestion de crises efficace, un accompagnement des évolutions naturelles de la forêt basé sur une interaction recherche-gestion (gestion adaptative, et la prise en compte explicite de la notion d’incertitude paraissent des éléments essentiels au maintien des services écosystémiques fournis par la forêt.Mountain forests produce a large number of ecosystem services that are going to be affected by climate change. We are expecting an increase in high altitude species that could result in the decrease in resinous and subalpine species. These changes in species could adversely affect biodiversity and timber production. However, we also observe an increase in productivity that favours the production of energy wood and, at least temporarily, timber, as well as carbon

  4. Land-use change and global climate policies; Usage des terres et politiques climatiques globales

    Energy Technology Data Exchange (ETDEWEB)

    Gitz, V

    2004-03-15

    This PhD thesis assess the role of land-use dynamics and carbon sequestration within climate policies. First, it describes the emergence, from the Rio-1992 to the Marrakech Accords (2001), of diplomatic controversies upon carbon sinks, in the context of the progressive constitution of a scientific basis on terrestrial carbon sinks. It questions the ability of the actual form of international climate regime to generate the appropriate incentives to sequester within the forestry sector in developed countries, or to control tropical deforestation. Second, the contribution of land-use change to atmospheric CO{sub 2} rise is quantified using a newly designed model of the global carbon cycle and regional land-use (OSCAR). We show that carbon emitted via land-use is not equivalent to fossil carbon emission in respect to atmospheric CO{sub 2} rise. This effect, all the more than land-use emissions are increasing, requires a greater mitigation effort to stabilize atmospheric CO{sub 2}. Finally, optimal timing of mixed climate policies involving fossil emissions mitigation and biological sequestration is assessed within an inter temporal cost-benefit framework. We show that the social value of sequestered carbon depends on anticipating future climate damages. Within optimal control models, this links the timing of sequestration to fossil effort and to the evolution of climate damages; if the latter are uncertain, but might be revealed at a later date, then it might be optimal to reserve part of the limited sequestration potential to cut off an eventual future abatement cost peak, were a climate surprise to finally imply stringent concentration ceilings. (author)

  5. Lutte contre le changement climatique. Local, global : intégrer atténuation et adaptation ----- Fighting climate change. Local, global: integrating mitigation and adaptation

    OpenAIRE

    LOCATELLI, Bruno

    2010-01-01

    N°3 - Les forêts illustrent comment articuler atténuation du changement climatique et adaptation.; Depuis la prise de conscience des impacts présents et potentiels du changement climatique, les réponses se sont davantage focalisées sur la réduction des gaz à effet de serre (GES) dans l'atmosphère, l'" atténuation " (mitigation en anglais), que sur la réduction de la vulnérabilité des sociétés et des écosystèmes face au changement climatique, " l'adaptation ". Aujourd'hui, le changement du cli...

  6. Vocabulary of global warming. Vocabulaire du rechauffement climatique; Volume 1: Les agents a effet de serre

    Energy Technology Data Exchange (ETDEWEB)

    Rivard, D.

    1992-01-01

    An English-French dictionary is presented of terminology relating to global warming. Terms are arranged in English alphabetical order, with explanatory notes and definitions in English and French; a cross-reference index of French terms gives their English equivalents. Examples of usage are also provided. The dictionary contains ca 6,000 terms, of which ca 1,250 are provided with definitions. The kinds of terms included are of the following four categories: contributors to the greenhouse effect, including carbon dioxide, chlorofluorocarbons, nitrogen oxides, methane, aerosols, and atmospheric water; radiation balance and albedo mechanisms; impacts on vegetation, water cycle, and living conditions; and related terminology such as found in the fields of paleoclimatology, palynology, geochronology, and mathematical modelling. The dictionary focuses on non-carbon dioxide greenhouse gases since the terminology for carbon dioxide is relatively stable while that related to non-carbon dioxide gases is as yet little known and rapidly evolving. 110 refs.

  7. Climate change at the coast: from global to local; Impact du changement climatique sur la cote: de global a local

    Energy Technology Data Exchange (ETDEWEB)

    Watkinson, A.R. [Tyndall Centre for Climate Change Research (United Kingdom); East Anglia Univ., School of East Science, Norwich (United Kingdom)

    2009-07-01

    The IPCC has recently documented substantial changes in the global heat content of the oceans, salinity, sea level, thermal expansion and biogeochemistry. Over the 21. century anticipated climate related changes include: a rise in sea level of up to 0.6 m or more; increases in sea surface temperatures up to 3 deg. C; an intensification of tropical and extra tropical cyclones; larger extreme waves and storm surges; altered precipitation/ run-off; and ocean acidification. The Tyndall Centre has been exploring how to down-scale the global analysis to the local level within the framework of a coastal simulator. The simulator provides information on possible future states of the coast through the 21. Century under a range of climate and socio-economic futures and shoreline management options. It links models within a nested framework, recognizing three scales: (1) global, (2) regional, and (3) local. The linked models describe a range of processes, including marine climate (waves, surges and mean sea level), sand bank morpho-dynamics, wave transformation, shoreline morpho-dynamics, built environment scenarios, ecosystem change, and erosion and flood risk. Analyses from the simulator reinforce conclusions from IPCC WG2: coasts will be exposed to increasing risks over coming decades due to many compounding climate-change factors; the impact of climate change on coasts will be exacerbated by increasing human induced pressures; the unavoidability of sea-level rise even in the longer-term frequently conflicts with present day human development patterns and trends. (author)

  8. Which role for methane emissions reduction in climate change mitigation policies; Quel role pour les reductions d'emission de methane dans la lutte contre le changement climatique?

    Energy Technology Data Exchange (ETDEWEB)

    Boucher, O. [Met Office-Hadley Centre (United Kingdom)

    2010-02-15

    Various arguments have been put forward to justify a rapid action to mitigate climate change through reductions in methane emissions. As part of a multi-gas emission reduction approach this requires defining an equivalence between methane and carbon dioxide. In this article, we discuss the physical and economical basis for a quantitative estimate of such an equivalence. Although this equivalence depends on a parameter which involves a value judgement on the most appropriate timescale for climate change, we show that it is difficult to justify a methane weight that is much different from the 100-year global warming potential that is currently used in the framework of the Kyoto protocol. (author)

  9. LE CHANGEMENT CLIMATIQUE ET LA FORÊT MÉTROPOLITAINE FRANÇAISE

    Directory of Open Access Journals (Sweden)

    GÉRARD BELTRANDO

    2011-11-01

    Full Text Available Les signes du changement climatique semblent de plus en plus nombreux et les écosystèmes en place, ainsi que les activités humaines qui en dépendent, s’y adaptent au mieux de leur possibilité. La forêt - dont le fonctionnement et la productivité sont étroitement dépendants du climat - est particulièrement concernée et, mis à part les effets des événements de fréquence rare (tempêtes de décembre 1999, canicule et sécheresse de l’été 2003…, son taux de croissance s’est accrut depuis près d’un demi-siècle et en particulier depuis les années 1980. Mais cette augmentation a des limites qui pourront être atteintes rapidement et pas uniquement sous l’effet du changement climatique. Comment le changement climatique va-t-il se répercuter sur la forêt métropolitaine française ? Quel scénario de changement climatique faudrait-il prendre en compte ? Quels conseils peuvent être connus aux forestiers qui doivent gérer et planter des arbres qui seront exploités par les générations futures ?

  10. Is man responsible for global warming?; L'homme est-il responsable du rechauffement climatique?

    Energy Technology Data Exchange (ETDEWEB)

    Legendre, A

    2009-07-01

    According to politicians, ecologists and mass media, it is now certain that with our CO{sub 2} emissions, we are all responsible for a major global warming to come with dramatic consequences. But, is this affirmation indisputable? Are we all responsible for the rise of sea level and the summer thawing of the arctic ice shelf? Is this expected global warming without precedent? And is CO{sub 2}, necessary for life, the cause of our misfortune? The answers commonly claimed are maybe more complex in reality and the climate question more subtle than it looks like. This book tries to decode the wheels of the climate machine and the share of human responsibility in climate change. (J.S.)

  11. Scientists have lost the North. Reflections on global warming; Les scientifiques ont perdu le Nord. Reflexions sur le rechauffement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Galam, S

    2008-07-01

    A huge difference exists between a scientific proof and a scientific theory. This is the case with global warming. No honest scientist can prove that mankind is the only responsible of it. The possibility of a natural cause to the observed disturbances is much more worrying, considering that with our present day knowledge, no determining element allows to identify its origin and there exist no warranty that we can face up to it. The author considers that in this affair, scientists have become gurus and their opinions are considered as absolute truths. Science is now decreed and not proven, information has become propaganda and the real risk of global warming is in its social impact. On this point it is effectively urgent to act.

  12. Physics for future Presidents - nuclear power, terrorism, global warming; La physique expliquee a notre futur president - Nucleaire, terrorisme, rechauffement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Muller, Richard A.

    2011-04-26

    This book explains the science behind the concerns that our nation faces in the immediate future. It outlines the tools of terrorists, the dangers of nuclear power, and the reality of global warming. As citizens who will elect future presidents of the most powerful and influential countries in the world, we need to know-truly understand if Iran's nascent nuclear capability is a genuine threat to the West, if biochemical weapons are likely to be developed by terrorists, if there are viable alternatives to fossil fuels that should be nurtured and supported by the government, if nuclear power should be encouraged, and if global warming is actually happening. This book is written in everyday, nontechnical language on the science behind the concerns that our nations faces in the immediate future. This book is translated from 'Physics for Future Presidents: The Science Behind the Headlines', published by W. W. Norton and Company in August 2008. Contents: 1 - Terrorism: Nine-eleven, Terrorist nukes, The next terrorist attack, Biological terrorism; 2 - Energy: Key energy surprises, Solar Power, The end of oil; 3 - Nukes: Radioactivity and death, Radioactive decay, Nuclear weapons, Nuclear madness, Nuclear power, Nuclear waste, Controlled fusion; 4 - Space: Space and satellites, Gravity applications, Humans in space, Spying with invisible light; 5 - Global Warming: A brief history of climate, The greenhouse effect, A very likely cause, Evidence, Non-solutions, The fruit on the ground, New technologies

  13. Negatep: A Scenario for Combating Global Warming; Le scenario Negatep. Un scenario de lutte contre le rechauffement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Acket, C.; Bacher, P. [Sauvons Le Climat, 92 - Boulogne Billancourt (France)

    2011-07-15

    There have been an increasing number of foresight exercises in the field of energy and global warming in recent years, as we have seen from the articles devoted to these questions by Futuribles in 2011 (both in this special issue and in the April number). It is certainly the case that the goals for greenhouse-gas emission reduction are rather ambitious, particularly in France, it being the aim of the 2005 French framework law on energy to reduce carbon gas discharges by a factor of four. Among these scenarios, the Negatep scenario developed by Claude Acket and Pierre Bacher from the 'Sauvons le climat' [Let's save the climate] Association proposes to achieve this ('factor 4') goal in France by 2050 by reducing fossil fuel use by 75% and replacing this as quickly as possible with electricity produced from non-carbon-gas-emitting sources - chiefly, nuclear power and renewables. The authors lay out their goals here, backed up by figures, comparing these with the reference scenario. They also show the path that must be followed to arrive at these goals, particularly in the residential and tertiary sectors, and in transport and industry (through control of needs and recourse to alternative energy sources). They close by comparing the Negatep scenario with two other more recent scenarios aimed also at reducing greenhouse gas emissions, on the one hand in Europe, and on the other in Germany. The comparison confirms that they were right to rely on electricity as a substitute for oil, but gives them cause for concern in respect of the consequences (formidable in their view) that the replacement of nuclear power and coal energy by intermittent renewable energies might have in Europe, both with regard to costs and to the effects on the power network. (authors)

  14. Services climatiques pour l'adaptation au changement climatique

    OpenAIRE

    Romain, Cavelier; Corine, Borel; Le Cozannet, Gonéri; Daniel, Ritti; Morin, Dominique; Marc, Chaussade; Véronique, Charreyron

    2016-01-01

    National audience; Le changement climatique constitue une problématique majeure perceptible dès aujourd'hui ; la société et l'ensemble de ses acteurs peuvent percevoir la nécessité de l'adaptation à cette nouvelle situation.

  15. Joint sciences academies statement: global response to climate change; Declaration commune des Academies des sciences sur la reponse globale au changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-06-01

    Taking into account that there is now strong evidence that significant global warming is occurring, the Joint Science Academies, urge, by this statement, all nations in the line with the UNFCCC principles, to take prompt action to reduce the causes of climate change, adapt to its impacts and ensure that the issue is included in all relevant national and international strategies. Some recommendations are also given. (A.L.B.)

  16. Une histoire de la chimie atmosphérique globale : Enjeux disciplinaires et d'expertise de la Couche d'ozone et du Changement climatique

    OpenAIRE

    Briday, Régis

    2014-01-01

    Until now, the history of environmental sciences has not extensively documented the input of atmospheric chemists, who formalize the chemical reactions that take place in the atmosphere. This PhD dissertation focuses on chemistry of the global atmosphere. Atmospheric chemistry has been in the heart of the expertise on the anthropogenic destruction of the ozone layer from 1970 on. Since the end of the 1980s, atmospheric chemists have also taken part in the writing of the IPCC reports. They hav...

  17. Simulations couplées globales des changements climatiques associés à une augmentation de la teneur atmosphérique en CO 2

    Science.gov (United States)

    Barthelet, Pierre; Bony, Sandrine; Braconnot, Pascale; Braun, Alain; Cariolle, Daniel; Cohen-Solal, Emmanuelle; Dufresne, Jean-Louis; Delecluse, Pascale; Déqué, Michel; Fairhead, Laurent; Filiberti, Marie-Angèle; Forichon, Michelle; Grandpeix, Jean-Yves; Guilyardi, Eric; Hqussais, Marie-Noëlle; Imbard, Maurice; Le Treut, Hervé; Lévy, Claire; Xin Li, Zhao; Madec, Gurvan; Marquet, Pascal; Marti, Olivier; Planton, Serge; Terray, Laurent; Thual, Olivier; Valcke, Sophie

    1998-05-01

    Two transient CO 2 experiments using two coupled general circulation models developed by the French GASTON group have been realized using the same methodology. No flux corrections at the air-sea interface were used in these experiments. The main features of the present climate are reasonably well captured by both coupled models in the control simulations, although the biases are not the same, The transient CO 2 simulations show a global warming, ranging between 1.6 and 2.0 °C at the time of CO 2 doubling (+ 70 years). These values, and the main geographical characteristics of climate change, are in agreement with previous studies published by other research groups, using either flux corrected or non-flux corrected models.

  18. Developpement D'un Modele Climatique Regional: Fizr Simulation des Conditions de Janvier de la Cote Ouest Nord Americaine

    Science.gov (United States)

    Goyette, Stephane

    1995-11-01

    . Cette nouvelle gamme de modeles-interpolateurs imbriques qualifies d'"intelligents" fait partie de la famille des modeles dits "pilotes". L'hypothese directrice de notre etude est fondee sur la supposition que le climat de fine echelle est souvent gouverne par des forcages provenant de la surface plutot que par des transports atmospheriques de grande echelle spatiale. La technique que nous proposons vise donc a guider FIZR par la Dynamique echantillonnee d'un MCG et de la forcer par la Physique du MCG ainsi que par un forcage orographique de meso-echelle, en chacun des noeuds de la grille fine de calculs. Afin de valider la robustesse et la justesse de notre modele climatique regional, nous avons choisi la region de la Cote Ouest du continent nord americain. Elle est notamment caracterisee par une distribution geographique des precipitations et des temperatures fortement influencee par le relief sous-jacent. Les resultats d'une simulation d'un mois de janvier avec FIZR demontrent que nous pouvons simuler des champs de precipitations et de temperatures au niveau de l'abri beaucoup plus pres des observations climatiques comparativement a ceux simules a partir d'un MCG. Ces performances sont manifestement attribuees au forcage orographique de meso-echelle de meme qu'aux caracteristiques de surface determinees a fine echelle. Un modele similaire a FIZR peut, en principe, etre implante sur l'importe quel MCG, donc, tout organisme de recherche implique en modelisation numerique mondiale de grande echelle pourra se doter d'un el outil de regionalisation.

  19. L'économie politique du changement climatique

    OpenAIRE

    Abbas, Mehdi

    2011-01-01

    International audience; La lutte contre les changements climatiques a inscrit à l'agenda économique, politique et social la décarbonisation du capitalisme. Or, le basculement vers un régime d'accumulation compatible avec la lutte contre les changements climatiques est porteur d'enjeux de richesse et de puissance colossaux et se posant à une échelle humaine et géopolitique inédite. Cet article inscrit les changements climatiques dans la dynamique du système qui les a produits : le capitalisme....

  20. Observation et modélisation spatiale du climat aux échelles fines dans un contexte de changement climatique

    OpenAIRE

    Quénol, Hervé

    2011-01-01

    Depuis la fin des années 1980, la communauté scientifique internationale s'intéresse au changement climatique global et s'interroge sur ses impacts futurs à l'échelle planétaire. Les différents rapports du GIEC (Groupe d'Experts Intergouvernemental sur l'Evolution du Climat) ont alerté la communauté internationale d'une augmentation de la température ainsi que de la fréquence et de l'intensité des aléas climatiques au niveau mondial. Même s'il existe de nombreuses incertitudes sur l'intensité...

  1. Variations et cycles climatiques à la Martinique

    Directory of Open Access Journals (Sweden)

    Vincent Huyghues-Belrose

    2008-02-01

    Full Text Available IntroductionDepuis quelques années, les médias rapportent systématiquement les catastrophes naturelles survenues dans le monde, donnant l’impression qu’elles sont plus fréquentes et plus graves que dans le passé. La psychose d’un dérèglement climatique général de la planète s’est accentuée notamment avec les tempêtes survenues en Europe depuis 1999. Cette inquiétude n’est pas nouvelle à la Martinique, puisque cela fait plus d’un siècle qu’on s’interroge sur un éventuel dessèchement de l’île.E...

  2. Global coupled simulations of climate change due to increased atmospheric CO{sub 2} concentration; Simulations couplees globales des changements climatiques associes a une augmentation de la teneur atmospherique en CO{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Barthelet, P.; Guilyardi, E.; Terray, L.; Thual, O.; Valcke, S. [Cerfacs, 31 - Toulouse (France); Bony, S.; Cohen-Solal, E.; Dufresne, J.L.; Fairhead, L.; Forichon, M.; Grandpeix, J.Y.; Le Treut, H.; Xin Li, Z. [Universite Pierre et Marie Curie, 75 - Paris (France). LMD; Braconnot, P.; Marti, O. [CEA Saclay, 91 - Gif-sur-Yvette (France). Direction des Sciences de la Matiere. Laboratoire de Modelisation du CLimat et de l`Environnement; Braun, A.; Cariolle, D.; Deque, M.; Marquet, P.; Planton, S. [CNRM, Meteo France, 31 - Toulouse (France); Delecluse, P.; Filiberti, M.A.; Houssais, M.N.; Imbard, M.; Levy, C.; Madec, G. [Universite Pierre et Marie Curie, 75 - Paris (France). Lodyc, CNRS/UPMC, Orstom

    1998-05-01

    Two transient CO{sub 2} experiments using two coupled general circulation models developed by the French GASTON group have been realized using the same methodology. No flux corrections at the air-sea interface were used in these experiments. The main features of the present climate are reasonably well captured by both coupled models in the control simulations although the biases are not the same. The transient CO{sub 2} simulations show a global warning, ranging between 1. 6 and 2.0 deg.C at the time of CO{sub 2} doubling (+ 70 years). These values, and the main geographical characteristics of climate change, are in agreement with previous studies published by other research group, using either flux corrected or non-flux corrected models. (authors) 23 refs.

  3. Flannery Tim, 2007, Les faiseurs de pluie. Comprendre et préserver l'équilibre climatique, Points, Paris, Le Seuil, (édition originale 2005, traduction en français 2006.

    Directory of Open Access Journals (Sweden)

    Edwin Zaccaï

    2008-02-01

    Full Text Available On constate actuellement une tendance à la prééminence des questions climatiques sur toutes les questions environnementales ou de développement durable. Les changements climatiques induits par l'Homme mobilisent le même type de vocabulaire que naguère la protection de la planète: menace globale, urgence, catastrophe, modification profonde des modes de vie à adopter. Une série de problèmes environnementaux concernant le futur, comme la disponibilité en eau, l'érosion de la biodiversité, des ri...

  4. Changement climatique et développement des territoires de montagne : quelles connaissances pour quelles pistes d’action ?

    Directory of Open Access Journals (Sweden)

    Didier Richard

    2011-01-01

    Full Text Available Le changement climatique est aujourd’hui une réalité au niveau international comme à celui des territoires locaux. Les travaux récents mettent préférentiellement l’accent sur l’analyse des conséquences du changement climatique. Cet article se propose de questionner et de qualifier l’impact du changement climatique dans les territoires montagnards des Alpes. Un premier axe de réflexion concerne l’évolution de la dangerosité de la montagne. Une montagne plus dangereuse se profile-t-elle ? Selon quels types de risques et avec quelles intensités ? Cependant, l’approche des risques naturels et de leur dynamique face au changement climatique ne saurait occulter le type d’activités économiques et les modes d’aménagements déjà existants de ces territoires. En ce domaine, l’économie touristique est prédominante en montagne. Sa pérennité comme sa vitalité constituent à l’évidence une priorité pour les acteurs territoriaux. Ces derniers ont mis en place des stratégies d’adaptation face au changement climatique. Pour mettre en place des approches intégrées face au changement climatique, les relations croisées entre risques naturels et modes d’aménagement des territoires montagnards appellent à encourager des lectures en termes de vulnérabilité territoriale.Climate change is today a reality at both the international and more local levels. Recent studies have focussed mainly on analysing the consequences of climate change. The present article seeks to examine and qualify the impact of climate change in the mountain areas of the Alps. A first line of enquiry concerns the changing level of danger in the mountain environment. Are mountain areas becoming more dangerous and, if so, in terms of what types of risks and to what degree? However, adopting an approach based on an analysis of natural hazards and their dynamics in response to climate change cannot ignore the economic activities and types of

  5. La lutte internationale contre le réchauffement climatique comme étant une source de dégradation des ressources marines The international fight against global warming as a source of degradation of marine resources

    Directory of Open Access Journals (Sweden)

    Syrine Ismaili

    2012-04-01

    Full Text Available Les ressources marines constituent une richesse économique d'une grande importance pour un grand nombre de pays de la planète. Du fait de l'action de l'homme, ces ressources subissent une fragilisation et une raréfaction dues entre autres à la pollution, à la surpêche, à l'urbanisation intensive...S'ajoute à cette liste, depuis quelques années, le réchauffement de la planète qui affecte d'une manière sensible la diversité biologique marine. Pourtant les réponses internationales face à cette dégradation, au delà du fait qu'elles soient timides, sont rares. Il faudra dès lors se rabattre sur les solutions de lutte globale contre le réchauffement de la planète entreprise par la communauté internationale afin de contrer cette dégradation.Marine resources are a wealth of great economic importance for many countries in the world. Due to the action of man, these resources undergo embrittlement and rarification among others to pollution, overfishing, urbanization, intensive ... Added to this list in recent years, the global warming that affects a significantly marine biodiversity. Yet the international response to this degradation, beyond the fact that they are shy, is rare. It will therefore fall back on solutions to the global fight against global warming taken by the international community to counter this degradation.

  6. Processus régissant la sensibilité climatique

    OpenAIRE

    Bony, Sandrine; Dufresne, Jean-Louis

    2007-01-01

    National audience; Une modification de la concentration des gaz à effet de serre modifie le bilan énergétique de la Terre. Cette modification, appelée forçage radiatif, entraîne une modification de la température moyenne de la Terre dont l'amplitude dépend non seulement du forçage lui-même mais aussi de la façon dont le système climatique dans son ensemble répond à ce forçage. Par exemple, la vapeur d'eau, la cryosphère et les nuages sont modifiés par un changement de température et ces modif...

  7. Communiquer le changement climatique: un voyage dans les stratégies et plans d'adaption

    NARCIS (Netherlands)

    Stoverinck, F.; Dubois, G.; Amelung, B.

    2013-01-01

    Les stratégies d’adaptation au changement climatique devraient normalement s’appuyer sur la meilleure information climatique disponible. Or le constat scientifique initial est souvent transformé, interprété, mis en forme par le processus de politique publique. Le message original s’en trouve

  8. Communiquer le changement climatique: un voyage dans les stratégies et plans d'adaption

    NARCIS (Netherlands)

    Stoverinck, F.; Dubois, G.; Amelung, B.

    2013-01-01

    Les stratégies d’adaptation au changement climatique devraient normalement s’appuyer sur la meilleure information climatique disponible. Or le constat scientifique initial est souvent transformé, interprété, mis en forme par le processus de politique publique. Le message original s’en trouve modifié

  9. 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

  10. La dynamique terrestre et les modifications climatiques

    Science.gov (United States)

    Fluteau, Frédéric

    2003-01-01

    The evolution of the Earth's climate over geological time is now relatively well known. Conversely, the causes and feedback mechanisms involved in these climatic changes are still not well determined. At geological timescales, two factors play a prevailing role: plate tectonics and the chemical composition of the atmosphere. Their climatic effects will be examined using palaeoclimatic indicators as well as results of climate models. I focus primarily on the influence of continental drift on warm and cold climatic episodes. The consequences of peculiar land sea distributions (amalgamation/dispersal of continental blocks) are discussed. Plate tectonics also drive sea level changes as well as mountain uplift. Marine transgressions during the Mid-Cretaceous favoured warmth within the interiors of continents, although their effect could be very different according to the season. Mountain uplift is also an important factor, which is able to alter climate at large spatial scales. Experiments relative to climatic sensitivity to the elevation of the Appalachians during the Late Permian are discussed. To affect the whole Earth, the chemical composition of the atmosphere appears to be a more efficient forcing factor. The carbon dioxide driven by the long-term carbon cycle has influenced the global climate. Geochemical modelling simulates more or less accurately the long-term evolution of pCO 2, which corresponds roughly to the icehouse/greenhouse climatic oscillations. However, the uncertainties on pCO 2 are still important because different parameters involved in the long-term carbon cycle (degassing rate, chemical weathering of silicates, burial of organic matter) are not well constrained throughout the past. The chemical composition of the atmosphere is also altered by the emissions of modern volcanic eruptions leading to weak global cooling. The influence of large flood basalt provinces on climate is not yet known well enough; this volcanism may have released huge amounts

  11. Changement climatique et atrophie des masses glaciaires : quelles mutations pour les paysages islandais ?

    Directory of Open Access Journals (Sweden)

    Marie Chenet

    2008-02-01

    Full Text Available Le Changement climatique global observé depuis la fin du Petit Age glaciaire en Islande entraîne un retrait généralisé des fronts glaciaires. Ce retrait engendre de nouvelles dynamiques sur les surfaces déglacées, liées à la libération d’eau de fonte et à la détente postglaciaire. La datation par la lichénométrie des arcs morainiques et des terrasses fluviatiles permettent de reconstruire l’évolution des marges proglaciaires du Morsárjökull et du Skaftafellsjökull (sud-est de l’Islande depuis la fin du Petit Âge glaciaire. Les versants sont le théâtre d’importants processus d’éboulisation et de chutes de blocs, tandis que l’on observe des phénomènes d’incision et de diminution du tressage au niveau des cours d’eau.The Global Warming which occurs since the end of the Little Ice Age in Iceland leads to the retreat of the glacier fronts. This retreat has induced new dynamics in the glacier foreland, especially related to glacial meltwater and post-glacial release. Lichenometrics measures on moraines ridges and paleosandurs provide us the opportunity to reconstruct the evolution of the proglacial areas of the Morsárjökull and the Skaftafellsjökull (South-east Iceland since the end of the Little Ice Age. Important processes of rockslides and rockfalls occur on slopes, whereas proglacial rivers undergo phenomena of incision and abandon of minor channels.

  12. Évaluations, impacts et perceptions du changement climatique dans le Grand Ouest : le projet CLIMASTER

    OpenAIRE

    MEROT, Philippe; Corgne, Samuel; Delahaye, Daniel; Desnos, Philippe; Dubreuil, Vincent; Gascuel, Chantal; Giteau, Jean-Luc; Joannon, Alexandre; Planchon, Olivier; Quénol, Hervé

    2012-01-01

    Nous nous proposons dans cette communication de décrire la démarche et les principaux résultats qui ont été obtenus dans le cadre du projet CLIMASTER, pour contribuer au débat sur l’état actuel des connaissances sur le changement climatique (CC) dans le Grand Ouest. Vis-à-vis du climat, nous avons développé des analyses originales portant essentiellement sur différentes longues chroniques climatiques du passé dans le Grand Ouest, pour voir l’évolution déjà en cours du CC. Ces analyses ont por...

  13. Métrologie en génie climatique

    CERN Document Server

    Dupuis, Thierry

    2009-01-01

    Que ce soit lors de sa réalisation, de sa maintenance ou de son exploitation, l'efficacité énergétique d'une installation de génie climatique (performance, rendement de génération, consommation d'énergie) ne peut être vérifiée qu'à partir de mesurages permettant d'apprécier la grandeur mesurée dans les meilleures conditions. Dans cet ouvrage, les paramètres physiques des installations techniques sont regroupés par thème détaillant chacun les moyens de mesurage envisageables pour une application de " terrain ", les règles et normes en usage, ainsi que les principes physiques permettant de mieux appréhender les manipulations. Sont abordées de manière détaillée : les mesures de débits aérauliques ; les mesures de débits hydrauliques ; les mesures de température ; les mesures d'hygrométrie ; les mesures de pression ; les mesures de combustion ; les mesures acoustiques et vibratoires ; la métrologie, les calculs d'erreur, les incertitudes de mesurage et les tolérances. Cet ouvrage co...

  14. EL NÍQUEL EN SUELOS Y PLANTAS DE CUBA

    OpenAIRE

    Olegario Muñiz Ugarte; Mirelys Rodríguez Alfaro; Alfredo Montero Álvarez; Juan Estévez Álvarez; Adriana M. de Aguiar Accioly; Clístenes W. Araujo Do Nascimento

    2015-01-01

    El contenido de Níquel (Ni) en el suelo es muydependiente del material parental que le dio origen. Por otraparte, el Ni existente en su superficie, puede ser tambiénun reflejo de su contaminación. La literatura internacionalseñala valores de Ni total en los suelos del mundo entre0,2 y 450 mg kg-1. Se conoce en la actualidad, que aunqueel Ni es esencial para las plantas superiores, su exceso enforma disponible puede ser tóxico, por lo que se consideraun Metal Pesado. En Cuba las encuestas real...

  15. Complejos de Níquel con Isocianuros y Carbenos

    OpenAIRE

    Valle Álvarez, María

    2014-01-01

    Los isocianuros son grupos funcionales muy atractivos en la química de la coordinación por su gran versatilidad como a-donadores y n-aceptares, con lo que pueden actuar como ligandos para una gran variedad de metales de transición. Los complejos de níquel con ligandos isocianuro son precursores de los complejos de carbenos, que funcionan como catalizadores en multitud de reacciones de síntesis orgánica. En este trabajo se estudian las reacciones de distintas aminas con los ...

  16. Climatic change and energy efficiency: what kind of stakes for the building?; Changement climatique et efficacite energetique: quels enjeux dans le batiment?

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-07-01

    More than 22% of the greenhouse gases are emitted by the building sector. In a context of a climatic change preoccupation, the authors wonder on the possibilities to reduce these emissions in the construction industry. The energy sources and the works on standards elaboration are discussed. (A.L.B.)

  17. Climatic servitude: climate change, business and politics; La servitude climatique: Changement climatique, Business et Politique

    Energy Technology Data Exchange (ETDEWEB)

    Belouve, J.M.

    2009-07-01

    This book is together a contemporary history book and a global dossier about a topic of prime importance in our civilization. It treats of the history of science, of ideas and events put in the modern civilization context, of science situation and scientific controversies, of the media aspects, of carbon economy and its related business, of Al Gore's and Maurice Strong's biographies, and finally, it makes a critical geopolitical analysis and makes proposals for a renovated ecology. In the conclusion, the author shows how climate change has become the hobbyhorse of a new thinking trend, namely the New World Order, aiming at conducting people to the acceptance of constraining policies encompassing the energy security of nations, new taxes, a worldwide economic disruption, the limitation of the World's population, and a World governance supported by the United Nations and not constrained by classical democratic rules. (J.S.)

  18. Modification des conditions de maturation du raisin en Bourgogne viticole liée au réchauffement climatique

    Directory of Open Access Journals (Sweden)

    Malika Madelin

    2010-12-01

    Full Text Available Les répercussions du changement climatique, en particulier celles qui sont liées à l’augmentation des températures, s’observent dans de nombreux vignobles dans le monde. En Bourgogne, depuis 20 ans, cette évolution thermique modifie les conditions de la maturation, moment-clef pour la typicité du vin et sa signature terroir-millésime. Après une étude de l’évolution des températures en Bourgogne montrant en particulier une rupture en 1987-1988, une analyse comparée des conséquences phénologiques, à partir des données thermiques et des dates des stades de développement, est proposée pour deux sites côte-d’oriens en Côte et en Hautes-Côtes de Beaune (Savigny-lès-Beaune et La Rochepot. Les résultats montrent un transfert latitudinal et altitudinal des températures et des indices viticoles sur 20-30 ans, ainsi qu’un « double effet » du réchauffement climatique lors de la maturation, lié à l’augmentation des températures et au décalage temporel de cette période, qui se place de plus en plus souvent en août.Impacts of climate change such as those related to global warming, are observed in many vineyards in France and as in other vineyards in the world. In Burgundy, since 20 years, this evolution of the temperatures changes the maturation conditions, key time for "typicité" and signature of "terroir-millésime". After a study of the changes in Burgundy temperatures (which shows a thermal rupture in 1987-1988, a comparative analysis of the phenologic consequences is performed using thermal data and development dates for two vineyard sites in Côte and Hautes-Côtes de Beaune (Savigny-lès-Beaune et La Rochepot. The results show a latitudinal and vertical transfer of the temperatures and vine’s indexes over a 20-30 year period as well as a double effect of climate warming in the maturation stage attributed to the increase in temperatures and the time shift of this period (which occurs most often in August.

  19. Les baobabs de Madagascar : quel cadre régle- mentaire pour leur ...

    African Journals Online (AJOL)

    dans la Région du Menabe. Or les pressions ... être particulièrement vulnérables au changement climatique ... impact négatif sur la survie des baobabs si aucune mesure de ... sur la carte de distribution des différentes espèces de baobab.

  20. Robert et Maya Kandel, La Catastrophe climatique, Hachette, 2009, 237 p.

    Directory of Open Access Journals (Sweden)

    Luc Semal

    2012-05-01

    Full Text Available Robert Kandel, astrophysicien et directeur de recherche émérite au CNRS, n’en est pas à son premier ouvrage sur le réchauffement climatique. Dans ce nouvel essai (co-rédigé avec sa fille Maya Kandel, il est intéressant de constater un changement de ton assez représentatif de l’inquiétude croissante des scientifiques à l’égard du bouleversement climatique en cours. Tout en rappelant qu’il a longtemps fait preuve de méfiance à l’égard des discours catastrophistes, Robert Kandel annonce dès l’i...

  1. Les géographes - climatologues français et le changement climatique aux échelles régionales

    Directory of Open Access Journals (Sweden)

    Gérard Beltrando

    2010-04-01

    Full Text Available En France, sur le sujet du changement climatique et quel que soit son origine, les géographes - climatologues se sont majoritairement intéressés à la description et l’explication de la variabilité du climat à diverses échelles de temps et d’espace sur des périodes écoulées. Ils se sont moins investis sur les formes d’adaptations tenant compte des résultats des simulations du climat futur, tel qu’il est envisagé à partir des calculs obtenus par les modèles numériques du climat. Cette frilosité s’explique en partie par le manque de précision et de fiabilité accordé aux résultats produits par ces modèles, aux échelles des territoires occupés par les sociétés humaines, mais aussi parce que les travaux de géographes montrent depuis longtemps que les sociétés humaines - indépendamment du changement climatique sous l’effet des gaz à effet de serre additionnels - ont une part directe dans bien des catastrophes qui les affectent (construction dans des zones inondables, production agricole dans des régions où la pluviométrie peut être insuffisante certaines années…. Les géographes-climatologues, commencent à utiliser des nouvelles sorties de modèle à des échelles plus opérationnelles pour proposer des formes d’adaptations spécifiques à chaque territoire et à chaque secteur économique. Ces recherches prospectives sont réalisées en tenant compte à la fois de la part d’incertitude des résultats produits par des modèles numériques, mais aussi des particularités des groupes sociaux et des milieux physiques dans lesquels s’inscrivent ces changements. Cela est un préalable nécessaire à toutes formes de réflexion approfondies sur l'identification des facteurs d’adaptation.In France, on the topic of climate change, the geographer climatologists are focused on the description and explanation of climate variability at various temporal and spatial scales on last period. They are less

  2. Impact des changements climatiques sur les revenus agricoles au Burkina Faso

    Directory of Open Access Journals (Sweden)

    Mathieu Ouedraogo

    2012-06-01

    Full Text Available Cette étude évalue l’impact des changements climatiques sur les revenus agricoles des agriculteurs au Burkina Faso, en utilisant l’approche ricardienne. Cette méthode permet de modéliser les revenus agricoles en fonction des variables climatiques, édaphiques, hydrologiques et socio-économiques. Plusieurs modèles économétriques ont été testés sur la base des données primaires de la campagne agricole 2002-2003. Ces modèles ont permis d’établir d’une part la relation qui existe entre le revenu agricole et les variables climatiques (température et précipitation et d’autre part, d’analyser la sensibilité des revenus agricoles par rapport à ces variables climatiques. Des simulations ont été faites sur la base des prévisions du groupe d’experts intergouvernemental sur l’évolution du climat (GIEC. Les résultats de l’étude ont montré que la relation entre le revenu et le climat est non linéaire. L’impact marginal de la température sur le revenu agricole est de -19,9 dollars US par hectare tandis que celui de la précipitation est de +2,7 dollars US par hectare. L’analyse des élasticités montre que l’agriculture est très sensible à la précipitation au Burkina. L’augmentation des précipitations de 1% entraine une hausse des revenus agricoles de 14,7%. Cependant, une augmentation des températures de 1% entraine une baisse des revenus agricoles de 3,6%. Les analyses de sensibilité ont montré que les paysans perdront 93% de leurs revenus suite à une augmentation de la température de 5°C. Ils perdront tout leur revenu suite à une diminution des précipitations de 14% (ceteris paribus. Du fait des conditions climatiques déjà difficiles, les scenarii de diminution des précipitations ou/et d’augmentation des températures sont très dommageables à l’agriculture au Burkina. Par ailleurs, l’étude a montré que la pratique de l’irrigation et l’accès à la vulgarisation ont un effet

  3. Stress hydrique et adaptation au changement climatique pour la viticulture et l'oenologie : le projet LACCAVE

    OpenAIRE

    Ollat, Nathalie

    2014-01-01

    Les effets du stress hydrique sur la vigne et la qualité du vin doivent être analysés aujourd’hui au regard des enjeux du changement climatique. L’article présente les enjeux et les premières synthèses du projet LACCAVE qui fédère les chercheurs INRA travaillant en France sur l’adaptation du secteur vigne et vin au changement climatique. Le projet vise à coordonner les travaux en cours dans différentes disciplines en les inscrivant dans une démarche de prospective. Dans un premier temps, nous...

  4. Conséquences prévisibles des changements climatiques pour les plantes pérennes

    OpenAIRE

    Ameglio, Thierry,

    2014-01-01

    L’agriculture et la sylviculture, qui sont responsables en France d’un cinquième des émissions de GES[1], sont particulièrement concernées par la problématique du changement climatique. Si elles se révèlent être plus sensibles que d’autres secteurs d’activités aux modifications climatiques, elles disposent aussi de plus grandes capacités pour participer à la réduction des émissions de GES.

  5. EL NÍQUEL EN SUELOS Y PLANTAS DE CUBA

    Directory of Open Access Journals (Sweden)

    Olegario Muñiz Ugarte

    2015-01-01

    Full Text Available El contenido de Níquel (Ni en el suelo es muydependiente del material parental que le dio origen. Por otraparte, el Ni existente en su superficie, puede ser tambiénun reflejo de su contaminación. La literatura internacionalseñala valores de Ni total en los suelos del mundo entre0,2 y 450 mg kg-1. Se conoce en la actualidad, que aunqueel Ni es esencial para las plantas superiores, su exceso enforma disponible puede ser tóxico, por lo que se consideraun Metal Pesado. En Cuba las encuestas realizadas reflejanun contenido medio de 122,3 mg kg-1de Ni total, muysuperior al señalado por la literatura internacional y valoresextremos de hasta 2850,0 mg kg-1en suelos desarrolladossobre rocas ultrabásicas (serpentinita. Sin embargo, noexisten reportes de valores elevados (tóxicos del elementoen los cultivos. En el trabajo se discute el origen y formasen que se encuentra el Ni en los suelos cubanos; así comosu posible efecto tóxico para las plantas y animales que sealimentan de ellas. Finalmente, se concluyó planteando lanecesidad de establecer Límites Permisibles de Ni en elsuelo, diferenciados de acuerdo al tipo de suelo y su uso.

  6. A new prospect on global environmental problems in the case of climate change: the impacts of strategic complementarity between countries; Une nouvelle mise en perspective des problemes environnementaux globaux dans le cas du changement climatique: les impacts de la complementarite strategique entre pays

    Energy Technology Data Exchange (ETDEWEB)

    Heugues, M.

    2009-06-15

    Among global environmental problems, climate change is one of the most serious. According to nearly all scientists, the roots of the problem is related to the accumulation of greenhouse gases (GHG) in the atmosphere and linked with human activities. The global character of this problem turns it into a big challenge. Within a framework of international trade liberalization, the analysis emphasizes the consequences of the inter-dependencies between economic agents, i.e. States, and of their strategic behaviours - when implementing national environmental policy - on natural environment. Starting with a deliberately conventional model and considering that countries' strategy can be complementary when emitting GHG, we bring new results in many respects and with regard to the existing ones. The thesis includes four chapters. The study highlights the impacts of the nature of the inter-dependencies between countries i) on the existence and the properties of equilibrium solutions - first, when no country cooperates and then from a globally optimal point of view -, ii) on the sequence of decisions, i.e. the circumstances under which a leader endogenously emerges when initiating its national environmental policy, iii) on profitability and stability of an international environmental agreement (IEA), iv) on the level of participation to an IEA and on the environmental impact of such a cooperation. A distinct feature of this research is to rely on the theorems of super-modular game theory. (author)

  7. Gestion des ressources hydriques adaptee aux changements climatiques pour la production optimale d'hydroelectricite. Etude de cas: Bassin versant de la riviere Manicouagan

    Science.gov (United States)

    Haguma, Didier

    Il est dorenavant etabli que les changements climatiques auront des repercussions sur les ressources en eau. La situation est preoccupante pour le secteur de production d'energie hydroelectrique, car l'eau constitue le moteur pour generer cette forme d'energie. Il sera important d'adapter les regles de gestion et/ou les installations des systemes hydriques, afin de minimiser les impacts negatifs et/ou pour capitaliser sur les retombees positives que les changements climatiques pourront apporter. Les travaux de la presente recherche s'interessent au developpement d'une methode de gestion des systemes hydriques qui tient compte des projections climatiques pour mieux anticiper les impacts de l'evolution du climat sur la production d'hydroelectricite et d'etablir des strategies d'adaptation aux changements climatiques. Le domaine d'etude est le bassin versant de la riviere Manicouagan situe dans la partie centrale du Quebec. Une nouvelle approche d'optimisation des ressources hydriques dans le contexte des changements climatiques est proposee. L'approche traite le probleme de la saisonnalite et de la non-stationnarite du climat d'une maniere explicite pour representer l'incertitude rattachee a un ensemble des projections climatiques. Cette approche permet d'integrer les projections climatiques dans le probleme d'optimisation des ressources en eau pour une gestion a long terme des systemes hydriques et de developper des strategies d'adaptation de ces systemes aux changements climatiques. Les resultats montrent que les impacts des changements climatiques sur le regime hydrologique du bassin de la riviere Manicouagan seraient le devancement et l'attenuation de la crue printaniere et l'augmentation du volume annuel d'apports. L'adaptation des regles de gestion du systeme hydrique engendrerait une hausse de la production hydroelectrique. Neanmoins, une perte de la performance des installations existantes du systeme hydrique serait observee a cause de l'augmentation des

  8. Jean-Baptiste Comby, La Question climatique. Genèse et dépolitisation d’un problème public (Raisons d’Agir, 2015)

    OpenAIRE

    2016-01-01

    Une sociologie de la dépolitisation du changement climatique La radicalité climatique Comment se fait-il que la question du réchauffement climatique, qui est portée à l’attention publique dans les démocraties occidentales depuis de nombreuses années maintenant, n’ait pas abouti à des changements politiques proportionnés à l’extrême gravité que lui prêtent les scientifiques ? Dans La Question climatique, issu d’une thèse en information-communication soutenue en 2008, Jean-Baptiste Comby propos...

  9. Régulation en génie climatique froid, climatisation, chauffage

    CERN Document Server

    Desmons, Jean

    2010-01-01

    Après un rappel des bases de l'électronique et de l'hydraulique nécessaires en régulation climatique, cet ouvrage donne tous les éléments méthodologiques et technologiques pour : concevoir les systèmes de régulation adaptés aux installations de froid, de climatisation et de chauffage ; mettre en oeuvre les régulateurs (entrées / sorties, réglage, paramétrage, dépannage, repérage et contrôle) ; pratiquer la maintenance des installations. Il regroupe notamment plusieurs cas pratiques de régulation d'installations réelles : groupe à eau glacée, bloc opératoire, pompes à chaleur, régulation numérique, détente directe, alimentation en fluide frigoporteur. Cette seconde édition révisée et mise à jour s'enrichit également d'une section sur les installations photovoltaïques et d'un nouveau chapitre sur la régulation numérique et les systèmes informatiques. Cet ouvrage constitue un outil de travail indispensable aux ingénieurs et techniciens en froid et génie climatique et en régu...

  10. Changement climatique et domaines skiables: simulation en Savoie et Haute-Savoie à l’horizon 2015

    Directory of Open Access Journals (Sweden)

    Jean-Christophe Loubier

    2007-03-01

    Full Text Available Les domaines skiables et le changement climatique posent des questions importantes et nouvelles pour les espaces montagnards. Dans les hautes vallées où ces domaines sont souvent le moteur principal du développement local, on peut s'interroger sur la pérennité du modèle économique de l'or blanc à moyen terme quand les modèles de simulation du climat tablent sur une élévation de la température moyenne comprise entre 1,5° et 5° en 2100. Nous avons tenté de simuler les effets du changement climatique à l'horizon 2015, sur les domaines skiables de Savoie et Haute Savoie.

  11. Recuperação de níquel, cobalto e terras raras de baterias níquel metal hidreto - NiMH

    OpenAIRE

    Daniel Assumpção Bertuol

    2007-01-01

    Este trabalho tem como objetivo desenvolver um processo de reciclagem para as baterias de NiMH, visando a recuperação de níquel, cobalto e terras raras que estão presentes nas baterias, através do emprego de processamento mecânico seguido de técnicas hidrometalúrgicas. Na primeira etapa deste trabalho foi realizada a caracterização de diferentes modelos de baterias de telefone celular esgotadas tipo NiMH, visando quantificar os diferentes materiais presentes. Nesta etapa observou-se a elevada...

  12. Les ecarts de financement en matiere d'adaptation aux changements climatiques - avec la perspective des CPDN

    DEFF Research Database (Denmark)

    Olhoff, Anne; Bee, Skylar; Puig, Daniel

    rapport sur les écarts financiers et les options permettant de les combler. Le rapport sera publié au printemps 2016. Cette mise à jour doit contribuer aux débats lors de la 21ème session de la Conférence des Parties (COP 21) à la Convention-Cadre des Nations Unies sur les Changements Climatiques (CCNUCC......). Elle comprend les principales conclusions concernant les coûts et les financements de l’adaptation aux changements climatiques du rapport AGR 2014 du PNUE ainsi que les conclusions préliminaires de l’évaluation de 2016. De plus, elle s’appuie sur les réflexions concernant les coûts de l’adaptation et...... les besoins de financement présentes dans les composantes adaptation des Contributions Prévues Déterminées au niveau National (CPDN) (INDC) – soit les engagements post 2020 que les pays se proposent mettre en oeuvre dans le cadre d’un nouvel accord mondial sur les changements climatiques....

  13. The climatic scenario of global warming; Les scenarios climatiques de rechauffement

    Energy Technology Data Exchange (ETDEWEB)

    Deque, M

    2007-07-01

    This presentation shows how the ARPEGE model, which is the regional model of Meteo-France, responds to the forcing results of the A2 scenario of the GIEC for the parameters of temperature and rainfalls. It emerges from the study that the main impact in France of the climatic change is an increase of the temperature in all seasons, an increase of the rains in winter and a decrease of the rains in summer. (A.L.B.)

  14. O Registro de Quelônios do Cretáceo Brasileiro

    OpenAIRE

    Diogo Lins Batista

    2005-01-01

    No Brasil há uma grande variedade de espécies de quelônios, tanto fósseis como recentes. Os quelônios fósseis são abundantes em algumas bacias brasileiras, sendo que as carapaças têm diferentes morfologias, de acordo com o tipo de ambiente: as terrestres como os jabutis (Cryptodira) têm carapaças bem arredondadas; as semi-aquáticas ou aquáticas como os cágados (Pleurodira) e as tartarugas-de-água-doce (Cryptodira) têm carapaça achatada; e as tartarugas- marinha (Cryptodira), têm carapaç...

  15. O Registro de Quelônios do Cretáceo Brasileiro

    Directory of Open Access Journals (Sweden)

    Diogo Lins Batista

    2005-01-01

    Full Text Available No Brasil há uma grande variedade de espécies de quelônios, tanto fósseis como recentes. Os quelônios fósseis são abundantes em algumas bacias brasileiras, sendo que as carapaças têm diferentes morfologias, de acordo com o tipo de ambiente: as terrestres como os jabutis (Cryptodira têm carapaças bem arredondadas; as semi-aquáticas ou aquáticas como os cágados (Pleurodira e as tartarugas-de-água-doce (Cryptodira têm carapaça achatada; e as tartarugas- marinha (Cryptodira, têm carapaças muito achatadas chegando ao ponto de não conseguirem retrair a cabeça. No registro brasileiro os cágados são os que mais comumente se encontram como fósseis. Neste estudo são analisados alguns dos principais quelônios já coletados. Tratam-se de fósseis do Cretáceo, oriundos das bacias Potiguar, Araripe, Bauru, Parnaíba e São Luís- Grajaú. As três primeiras bacias são especialmente importantes, pois é delas que provêm os holótipos de Apodichelys lucianoi PRICE, 1954; Araripemys barretoi PRICE, 1973; Santanachelys gaffneyi HIRAYAMA, 1998;Roxochelys wanderleyi PRICE, 1953; Bauruemys elegans (SUAREZ, 1969 KISCHLAT, 1994; e as "Podocnemys". Estes quelônios também têm importância para as reconstituições paleoambientais, possibilitando a compreensão das antigas conexões entre rios, lagos e mares.

  16. Impact des changements climatiques sur l’agriculture dans la plaine de Jeffara sud-est tunisien

    Directory of Open Access Journals (Sweden)

    Houcine Jeder

    2013-12-01

    Full Text Available Cette étude évalue la vulnérabilité de l’agriculture dans la plaine de Jeffera sud-est tunisien aux changements climatiques en utilisant la méthode Ricardienne. Cette méthode consiste à exprimer les revenus nets agricoles en fonction des variables climatiques, édaphiques et socio-économiques. Ces modèles ricardiens ont été testés sur la base des données d’une enquête réalisée dans le cadre de projet de développement dans la plaine Jeffera pour la compagne agricole 2002-2003.  Ces modèles ont permis d’exprimer d’une part la relation qui existe entre le revenu agricole et les variables climatiques (température et précipitation et d’autre part, d’analyser la sensibilité des revenus agricoles par rapport à ces variables climatiques. Des simulations ont été faites sur la base de scenario A2 résultat de la projection faite par le modèle HadCM3 à l’échelle nationale et régionale de la Tunisie.Les résultats de l’étude ont montré que la relation entre le revenu agricole et le climat est non linéaire. De même, les effets négatifs de certaines options d’adaptation ont montré que  l’agriculture dans la plaine de Jeffera est une agriculture paysanne basée sur le travail familial qui nécessite aujourd’hui un capital financier important et une marge de modernisation afin d’améliorer l’activité agricole dans les années futures. Tandis que les effets positifs de certaines autres options peuvent être servir comme des points de réflexion dans l’élaboration des stratégies d’adaptation aux changements climatiques comme l’utilisation des nouvelles technologies d’irrigation et l’intégration de l’activité de l’élevage dans l’exploitation agricole.

  17. La défense face aux défis du dérèglement climatique

    Directory of Open Access Journals (Sweden)

    Bastien Alex

    2015-01-01

    Full Text Available Dans un rapport rédigé il y a plus de dix ans, le Pentagone établissait un lien entre sécurité et changement climatique. Depuis lors, l’étude du potentiel crisogène du phénomène s’est approfondie. Du fait de sa propension à renforcer le pouvoir de nuisance des aléas naturels et à, indirectement, produire de nouveaux risques, il est désormais considéré comme un « multiplicateur de menace » (Center for Naval Analyses 2007. Le changement climatique est ainsi un enjeu de premier plan pour les acteurs de la défense, institutionnels, militaires et industriels, et soulève plusieurs problématiques. Dans un premier temps se pose évidemment la question des risques et menaces sécuritaires découlant des manifestations des changements climatiques (modification du régime des précipitations, hausse du niveau des mers et océans, multiplication des phénomènes climatiques exceptionnels et l’étude de leur propension à générer de l’insécurité. Dans un deuxième temps se pose celle des réponses à y apporter en matière doctrinale (réflexion stratégique, opérationnelle (gestion de crise mais aussi en termes capacitaires (impacts sur l’outil militaire. Enfin, il convient d’étudier dans un troisième temps, et c’est là un paradoxe, les conséquences sur la sécurité internationale des politiques et stratégies d’adaptation qui seront développées par les Etats ou d’autres acteurs pour faire face aux défis posés par le dérèglement climatique.

  18. Estructura molecular y cristalina del bis (bis(dietilamino glioximato níquel (II

    Directory of Open Access Journals (Sweden)

    Luis Alejandro Nuvan

    2009-07-01

    Full Text Available Ni(CioH2lN4022- monoclínico, grupo espacial P2i/a, a = 15.760 (2, b = 11.793 (3, c = 7.297 (1 A°, j3 = 99.10 (1°, V = 1339.0 (7 A°3, Z = 2 , De = 1.28 Mg M " \\ M = 765 M " ' . La estructura fue resuelta por el método del átomo pesado y afinada por mínimos cuadrados, utilizando la matriz completa, hasta obtener una concordancia R = 0.068 para todas las reflexiones observadas. El átomo de níquel está localizado en un centro de inversión y presenta una coordinación cuadrado planar. El complejo Bis (Bis (Dietilamino Glioximato Níquel (II es casi planar y el desplazamiento de los grupos etil con respecto al plano es producido por efectos estéricos. Las moléculas planares se apilan a lo largo de c, las normales a los planos forman con este eje un ángulo de 41.53 . Existen interacciones axiales entre el níquel y los grupos amino de las moléculas adyacentes de la columna.

  19. Expected impacts of climate change on extreme climate events; Impacts du changement climatique sur les evenements climatiques extremes

    Energy Technology Data Exchange (ETDEWEB)

    Planton, S.; Deque, M.; Chauvin, F. [Meteo-France, Centre National de Recherches Meteorologiques/groupe d' Etude de l' Atmosphere Meteorologique (CNRM/GAME), 31 - Toulouse (France); Terray, L. [Centre Europeen de Recherches Avancees en Calcul Scientifique, 31 - Toulouse (France)

    2008-09-15

    An overview of the expected change of climate extremes during this century due to greenhouse gases and aerosol anthropogenic emissions is presented. The most commonly used methodologies rely on the dynamical or statistical down-scaling of climate projections, performed with coupled atmosphere-ocean general circulation models. Either of dynamical or of statistical type, down-scaling methods present strengths and weaknesses, but neither their validation on present climate conditions, nor their potential ability to project the impact of climate change on extreme event statistics allows one to give a specific advantage to one of the two types. The results synthesized in the last IPCC report and more recent studies underline a convergence for a very likely increase in heat wave episodes over land surfaces, linked to the mean warming and the increase in temperature variability. In addition, the number of days of frost should decrease and the growing season length should increase. The projected increase in heavy precipitation events appears also as very likely over most areas and also seems linked to a change in the shape of the precipitation intensity distribution. The global trends for drought duration are less consistent between models and down-scaling methodologies, due to their regional variability. The change of wind-related extremes is also regionally dependent, and associated to a poleward displacement of the mid-latitude storm tracks. The specific study of extreme events over France reveals the high sensitivity of some statistics of climate extremes at the decadal time scale as a consequence of regional climate internal variability. (authors)

  20. Le rôle des facteurs locaux sur les effets des changements climatiques au Quaternaire supérieur sur les environnements naturel du Néguev septentrional

    Directory of Open Access Journals (Sweden)

    Aaron Yair

    2010-10-01

    Full Text Available Les régions sèches sont souvent considérées sensibles aux changements climatiques. Pour ces régions, une relation positive est souvent proposée entre la pluie annuelle moyenne et les données de l'environnement, par des scientifiques appartenant à des disciplines diverses. Cependant les modèles climatiques globaux sont encore incapables de prévoir d'une façon précise l'évolution du climat à l'échelle régionale et ses effets possibles sur l'environnement. De plus, ces modèles sont impuissants à traduire l'influence que des facteurs non climatiques tels que la lithologie et les sols, ainsi que des facteurs biologiques, exercent sur la répartition de l'eau dans l'espace et le temps. En d'autres termes, le même changement climatique régional prévu aura probablement des effets différents dans les secteurs rocheux, lœssiques ou sableux. Le Néguev septentrional offre des conditions très favorables pour l'étude des effets possibles du changement climatique prévu, le long d'un gradient pluviométrique régional où les unités physiographiques varient dans l'espace. Deux cas sont considérés. Le premier traite des effets sur l'environnement du dépôt d'un couvert lœssique lors d'une phase climatique humide au Quaternaire supérieur. Le second examine l'influence de croûtes biologiques de surface sur le régime hydrique d'une zone sableuse le long d'un gradient pluviométrique actuel. Dans les deux cas, le gradient pluviométrique est accompagné par d'autres gradients (géomorphologiques, pédologiques, biologiques. Les données obtenues attirent l'attention sur les relations complexes entre le gradient pluviométrique et les autres gradients, qui peuvent entraîner des effets négatifs sur les ressources hydriques et sur la qualité de l'environnement.Dryland areas are usually regarded as highly sensitive to climate change. A positive relationship between average annual rainfall and environmental variables is often assumed

  1. Les négociations climatiques : vingt ans d’aveuglement ?

    Directory of Open Access Journals (Sweden)

    Stefan Aykut

    2015-01-01

    Full Text Available Le régime climatique est, parmi les régimes internationaux qui concernent l’environnement, unique à la fois par son importance, le nombre de partenaires impliqués, le rôle de l’accompagnement scientifique, les moyens déployés, la régularité des conférences onusiennes consacrées et l’ampleur de ces rendez-vous planétaires. La déception après l’échec de la conférence de Copenhague en 2009 fut à la hauteur des attentes suscitées. Il y a eu différentes tentatives d’expliquer cet échec. A la différence de ces analyses, qui gardent leur pertinence, mais adoptent un regard plutôt « internaliste » du régime climatique, nous allons montrer en quoi l’impasse actuelle des négociations reflète un schisme plus large entre une réalité de l'extérieur, celle de la globalisation des marchés, de l’exploitation effrénée des ressources d’énergies fossiles et des Etats pris dans une concurrence économique féroce, et de l’autre, une sphère des négociations et de la gouvernance qui véhicule l’imaginaire d’un « grand régulateur central » apte à définir et distribuer des droits d’émissions mais de moins en moins en prise avec la réalité extérieure. A travers les principales étapes de l’histoire des négociations – signature de l’UNFCCC, Protocole de Kyoto, non-ratification des États-Unis, montée des émergents, échec de Copenhague et préparations pour Paris 2015 –, nous suivrons l’évolution d’un cadrage qui agrandit le schisme au lieu de le réduire. L’histoire du régime climatique est aussi celle d’un décalage entre temporalités : la lenteur des négociations contraste avec des accélérations dans le monde réel – globalisation économique, gaz de schiste aux États-Unis, ascension des émergents, mais aussi essor des renouvelables dans plusieurs pays – insuffisamment reflétés dans les négociations.

  2. Globalization

    Institute of Scientific and Technical Information of China (English)

    范玮丽

    2008-01-01

    This paper mainly talks about the currently hot topic-globalization. Firstly, it brings out the general trend about globalization and how to better understand its implication. Secondly, it largely focuses on how to deal with it properly, especially for international marketers. Then, facing with the overwhelming trend, it is time for us to think about seriously what has globalization brought to us. Last but not least, it summarized the author's personal view about the future of globalization and how should we go.

  3. Globalization

    Directory of Open Access Journals (Sweden)

    Tulio Rosembuj

    2006-12-01

    Full Text Available There is no singular globalization, nor is the result of an individual agent. We could start by saying that global action has different angles and subjects who perform it are different, as well as its objectives. The global is an invisible invasion of materials and immediate effects.

  4. Comportamiento de películas delgadas de níquel y óxido de níquel en NaCl al 3 %

    Directory of Open Access Journals (Sweden)

    Magaña, C. R.

    2006-02-01

    Full Text Available The aim of this work is to study the behaviour of both: a nickel thin film deposited on steel AISI 1018 (UNS G 10180 and a superior nickel oxide electrochemically obtained on the film; with the purpose of decreasing the corrosion rate of low carbon steel immersed in a solution of NaCl 3% wt, thus efficient anticorrosive protection could be obtained. Two film deposition techniques were used: electrochemical and magnetron DC sputtering; and the protective properties of deposited films exposed to the aggressive media, were evaluated. The characterization of different films was carried out by using electrochemical techniques: polarization curves and electrochemical impedance.

    Este trabajo se enfoca al comportamiento que presenta una película delgada de níquel depositada sobre acero al carbón AISI 1018 (UNS G 10180 y un óxido superior del mismo níquel, con el propósito de disminuir la velocidad de corrosión del acero cuando se expone a una solución de NaCl al 3 % y obtener así una protección anticorrosiva alternativa eficaz. En este trabajo se comparan dos técnicas de depósito: electroquímico y decapado catódico o Magnetron DC Sputtering, y se evalúa la protección a la corrosión de cada depósito frente al medio agresivo. La caracterización de los diferentes depósitos se realizó a través de técnicas electroquímicas, (curvas de polarización y espectroscopia de impedancia.

  5. Gestion Technique Centralisée en Génie Climatique

    CERN Document Server

    Pepinster, P

    1999-01-01

    Il y a une quinzaine d'années, la Division ST a introduit sur les équipements de chauffage et de climatisation du CERN, des systèmes de contrôle locaux à microprocesseur en lieu et place des chaînes de régulation devenues obsolètes. Adoptée dans une volonté d'évolution technologique et dans une démarche de rationalisation des dépenses d'énergie, cette technique s'est répandue sur les différents sites du Laboratoire au fil des années. Depuis les applications de confort climatique dans les bâtiments tertiaires, jusqu'au conditionnement d'air des accélérateurs et des expériences, en passant par l'autocontrôle des chaufferies centrales, ces 'Unités de Traitement Locales' (UTL) sont aujourd'hui interconnectées en un système de Gestion Technique Centralisée d'environ 140 sous-stations. L'objet du document est de présenter la structure actuelle de ce système GTC, d'en montrer les possibilités et l'intérêt dans son exploitation quotidienne au CERN, et d'aborder ses évolutions futures.

  6. Aérosols atmosphériques propriétés et impacts climatiques

    CERN Document Server

    Boucher, Olivier

    2012-01-01

    L’hypothèse d’une cause anthropique au réchauffement climatique est désormais considérée comme valide par la très grande majorité de la communauté scientifique. Les gaz à effet de serre ne sont toutefois pas les seuls facteurs de modification du climat. Le rôle des aérosols doit aussi être souligné : il est admis que ces derniers ont partiellement masqué le pouvoir réchauffant des gaz à effet de serre depuis le début de l’ère industrielle. Ils interagissent en outre fortement avec le cycle de l’eau et un certain nombre de cycles biogéochimiques. C’est l’ensemble de ces interactions – entre aérosols, rayonnement, cycle hydrologique, etc. – que ce livre propose de passer en revue. Après avoir décrit les principales propriétés physiques et chimiques des aérosols, le livre expose les principes de modélisation des aérosols à grande échelle ; il décrit ensuite la théorie du transfert radiatif dans l’atmosphère, les techniques de télédétection et d’observati...

  7. quel en cavidad oral de individuos con agrandamiento gingival inducido por tratamiento ortodóncico

    OpenAIRE

    Gómez Arcila,Verónica; Mercado Camargo,Jairo; Herrera Herrera,Alejandra; Fang Mercado,Luis; Díaz Caballero,Antonio

    2014-01-01

    El agrandamiento gingival es una de las alteraciones orales generadas por el uso de aparatología ortodóncica fija. Inicialmente fue descrito como producto de la respuesta alérgica del huésped al níquel, y estudios recientes demostraron que este metal induce proliferación fibroblástica. Sin embargo, se desconoce el grado de bioacumulación de este metal en la cavidad oral. El objetivo del presente estudio consistió en cuantificar la concentración de níquel en muestras de saliva, placa dental y ...

  8. Análisis comparativo del comportamiento biomecánico de dos limas rotatorias de Níquel-Titanio

    OpenAIRE

    Niño Barrera, Javier Laureano

    2013-01-01

    Las limas rotatorias de N��quel-Titanio son un avance tecnol�ogico que permite al endodoncista llevar a cabo tratamientos de endodoncia en morfolog��as irregulares sin alterarlas. Lamentablemente estos instrumentos pueden fracturarse sin presentar se~nales visibles que permitan prevenir este accidente. Por lo tanto el objetivo del presente estudio fue determinar los factores estructurales de dise~no mec�anico asociados a la falla(por fractura) de las limas de N��quel-Titanio pa...

  9. Health impacts of climate change in France. Which challenges for the InVS?; Impacts sanitaires du changement climatique en France. Quels enjeux pour l'InVS?

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-07-01

    Based on a literature survey, this report proposes a synthetic overview of the main health risks which might be induced by climate change in France. For each of them, it identifies the existing surveillance and alert systems, and proposes orientations for their adaptation. After a description of the climate and environment context, and a presentation of the adopted method of selection of health risks potentially impacted by climate change, the report gives an overview of these risks and of the associated surveillance systems. It discusses the evolution perspectives in terms of surveillance and alert tools, of relationship with research activities, of surveillance of health effects of actions which reduce greenhouse gas emissions, of interdisciplinary development, and of international cooperation

  10. Influencia sobre el extractable de níquel de los minerales oxidados del yacimiento Punta Gorda

    Directory of Open Access Journals (Sweden)

    Antonio R. Chang-Cardona

    2014-12-01

    Full Text Available El propósito fue validar, a escala industrial, una metodología para períodos largos en una loza de 8 hornos en la empresa productora de níquel Comandante Ernesto Che Guevara, con el fin de crear una base de datos de producción confiable para su procesamiento estadístico y demostrar la influencia del contenido de los principales minerales oxidados sobre el extractable de níquel y la tendencia en el comportamiento del extractable de cobalto. Se demostró, mediante experimentos, durante tres meses de monitoreo, la efectividad del software COMPRAC para obtener la composición racional de 100 kg de varios tipos de mena laterítica que entran a los hornos de reducción. A partir de la base de datos creada se obtuvo, por primera vez, las gráficas que reflejan la influencia del contenido de los principales minerales sobre los extractables de níquel y de cobalto; en el caso del níquel con suficiente sensibilidad y confiabilidad para la toma de decisiones operacionales eficaces en el circuito tecnológico Mina-Preparación de Mineral-Hornos de Reducción

  11. Globalization

    DEFF Research Database (Denmark)

    Plum, Maja

    Globalization is often referred to as external to education - a state of affair facing the modern curriculum with numerous challenges. In this paper it is examined as internal to curriculum; analysed as a problematization in a Foucaultian sense. That is, as a complex of attentions, worries, ways...... of reasoning, producing curricular variables. The analysis is made through an example of early childhood curriculum in Danish Pre-school, and the way the curricular variable of the pre-school child comes into being through globalization as a problematization, carried forth by the comparative practices of PISA...

  12. Catalizadores de níquel para la deshidrogenización de isopropanol a acetona

    OpenAIRE

    Guillermo Peña G.; Álvaro Muñoz G.; Luis Carballo S.; Francisco Sánchez

    2011-01-01

    Se prepararon catalizadores de óxido de níquel soportados en sílica-gel y alúmina, por los métodos de impregnación, precipitación y coprecipitación. También se estudió el efecto de la adición de estaño como promotor. Se siguió un diseño factorial de experimentos para la preparación de los catalizadores y se determinó la importancia relativa de las variables, así como los niveles más adecuados, entre los estudiados. EI método de impregnación, utilizando sílica-gel como soporte y con estaño com...

  13. Quels impacts des TIC sur le développement durable ?

    Directory of Open Access Journals (Sweden)

    Benoît Dumolin

    2015-07-01

    Full Text Available La première partie de l’étude examine quels sont les impacts des TIC sur le développement durable. A l’inverse d’une approche sectorielle, l’objectif du développement durable s’inscrit à l’intersection des sphères sociétale, économique, environnementale et de la gouvernance. La dimension transversale des TIC rend l’analyse des interactions entre ces quatre piliers difficile d’autant plus que l’influence du numérique sur l’économie ou sur l’organisation sociale est complexe à mesurer. Les effe...

  14. Les hêtraies du Châtillonnais (Côte-d’Or face au changement climatique

    Directory of Open Access Journals (Sweden)

    Waltraud Wimmer

    2013-06-01

    Full Text Available L'étude traite des hêtraies du Châtillonnais (Côte-d'Or, Bourgogne face au changement climatique observé. Les données regroupent les séries bourguignonnes de température et de précipitation des stations de Météo France (1989-2009, la carte des hêtraies de l'Institut forestier national (IFN, un modèle numérique de terrain (MNT, SRTM et quatre indices de vulnérabilité du hêtre identifiés dans la littérature. La méthode repose sur une interpolation fine (mailles de 100 m de ces indices par régression-krigeage. Les résultats permettent de cartographier les risques actuels.

  15. Alain Gras, 2007, Le Choix du feu. Aux origines de la crise climatique, Fayard, 281 p.

    Directory of Open Access Journals (Sweden)

    Luc Semal

    2008-02-01

    Full Text Available Alain Gras est professeur de socio-anthropologie des techniques à Paris-I et membre du comité de rédaction de la revue Entropia. Dans Le Choix du feu, il analyse les choix techniques qui ont fait de notre société une société thermo-industrielle (c’est-à-dire fondée sur la puissance du feu et qui sont à l’origine de la crise climatique actuelle. Car selon lui, il s’agissait bien d’un choix, qui n’avait rien d’inéluctable : Alain Gras s’oppose fermement à l’idée d’un déterminisme technique (ou...

  16. DETECCIÓN DE METALES LIBERADOS EN SALIVA DESPUÉS DE LA COLOCACIÓN DE CORONAS NÍQUEL CROMO: ESTUDIO PILOTO

    OpenAIRE

    L MARTINEZ OLGUIN, JERALDINE IZCHE

    2015-01-01

    El propósito fundamental de este trabajo es la detección de níquel, cromo y hierro liberados en saliva después de la colocación de coronas níquel- cromo en pacientes sometidos a rehabilitación bucal en un periodo de 2 meses, en la Clínica de Odontopediatría de la Universidad Autónoma del Estado de México

  17. Contraintes climatiques dans les Préalpes françaises : évolution récente et conséquences potentielles futures

    Directory of Open Access Journals (Sweden)

    Sandra Rome

    2010-12-01

    Full Text Available Le climat des Alpes françaises reste encore mal décrit, et sa variabilité interannuelle est difficile à étudier du fait des spécificités topoclimatiques locales et du manque de séries climatiques longues. Les conséquences régionales du changement de certaines contraintes climatiques sur plusieurs secteurs d’activité sont pourtant redoutées. Cet article propose donc un diagnostic des variations climatiques contemporaines (1959-2009 à l’échelle des Préalpes du Nord (Vercors et Chartreuse en utilisant des chroniques stationnelles pluviothermiques. Les changements observés sont ensuite mis en relation avec des impacts connus ou potentiels sur les activités socio-économiques régionales.The climate of the French Alps remains poorly described, and its interannual variability is difficult to study because of the wide variety of local topoclimatic characteristics and the lack of available long-term time-series. Regional consequences by certain climatic threat on various economic activities are nevertheless expected. This article thus proposes a diagnosis of the contemporary climatic variations (1959-2009 on the scale of French northern Prealps (Vercors and Chartreuse by using the time series of 4 reference stations. Observed changes are then related to known or potential impacts on the regional socioeconomic activities.

  18. REMOCIÓN DE COBRE Y NÍQUEL POR INTERCAMBIO CATIÓNICO CON UNA ZEOLITA NATURAL

    Directory of Open Access Journals (Sweden)

    Arnoldy Estupiñan

    2010-10-01

    Full Text Available Se empleó la zeolita natural clinoptilolita, para remover cobre y níquel de aguas residuales de una industria de galvanotecnia. La capacidad de intercambio determinada para la zeolita transformada al estado homoiónico sódico, fue de 0,794 meq/g para cobre y 0,447 meq/g para níquel. Se realizaron ensayos en cochada y en columna, alcanzando éste último un mayor acercamiento al equilibrio. En los ensayos de regeneración, la zeolita sódica concentró el cobre hasta 23,5 veces con respecto al valor que presenta en los enjuagues de los baños de recubrimiento en medio ácido, mostrando su potencialidad para usarla en el tratamiento de estos residuos, por su efectividad y bajo costo.

  19. Contribution a l'analyse des tendances de peupelement de macroinvertébrés benthique dans un contexte de réchauffement climatique.cas de sous basin de TAFNA

    OpenAIRE

    REZOUGUI, Amina

    2012-01-01

    Le changement climatique exerce une influence sur les écosystèmes aquatiques induisant à des variations dans leur structure. La sédentarité du peuplement des macroinvertébrés benthiques, le soumis sous l’influence de ces variations climatique. Pour mettre en évidence l’effet du changement climatique sur le peuplement des macroinvertébrés, on a effectué des prélèvements sur une période de sept mois (un prélèvement pour chaque mois). Sept stations de l’amont vers l’aval de l’oued Tafna ont été ...

  20. Catalizadores de níquel para la deshidrogenización de isopropanol a acetona

    Directory of Open Access Journals (Sweden)

    Guillermo Peña G.

    2011-11-01

    Full Text Available Se prepararon catalizadores de óxido de níquel soportados en sílica-gel y alúmina, por los métodos de impregnación, precipitación y coprecipitación. También se estudió el efecto de la adición de estaño como promotor. Se siguió un diseño factorial de experimentos para la preparación de los catalizadores y se determinó la importancia relativa de las variables, así como los niveles más adecuados, entre los estudiados. EI método de impregnación, utilizando sílica-gel como soporte y con estaño como promotor, presentó las mejores propiedades deshidrogenantes. Se observó una gran influencia de las condiciones de lavado y calcinación sobre el comportamiento final de estos catalizadores.

  1. Helga-Jane Scarwell et Isabelle Roussel (dir., 2010, Le changement climatique : Quand le climat nous pousse à changer d’ère, Presses Universitaire du Septentrion, Lille, 358 pages

    Directory of Open Access Journals (Sweden)

    Laurence Rocher

    2010-12-01

    Full Text Available L’ouvrage « Le changement climatique. Quand le climat nous pousse à changer d’ère », édité par les Presses Universitaire du Septentrion dans la collection Environnement et société, coordonné par Helga-Jane Scarwell et Isabelle Roussel, rassemble autour de la question du changement climatique plusieurs contributions de chercheurs en géographie, pour la plupart membres du laboratoire TVES de Lille. Ce livre apporte un éclairage original et intéressant, alliant des études de cas comportant un fo...

  2. Températures et indices bioclimatiques dans le vignoble du Val de Loire dans un contexte de changement climatique

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    Hervé Quenol

    2010-12-01

    Full Text Available La variabilité spatiale et temporelle du climat à l’échelle régionale peut parfois être marquée. Les différences spatiales observées peuvent être dues à la proximité ou non d’un océan, à la topographie, l’altitude, ou bien encore à la position latitudinale des stations. Le Val de Loire, l’une des grandes régions viticoles françaises, du fait de son orientation est-ouest, connaît des nuances climatiques assez marquées avec une influence océanique à l’ouest, liée à la proximité de l’Océan Atlantique, qui s’atténue en allant vers l’est où le climat est marqué par des caractéristiques plus continentales. De ce fait, différentes caractéristiques climatiques viticoles sont observées dans la vallée de Loire. Depuis le milieu du XXe siècle, un réchauffement généralisé est observé à partir de toutes les stations Météo - France. Ce réchauffement est plus sensible depuis la fin des années 80. Cette augmentation de température se répercute logiquement sur les indices bioclimatiques viticoles.Spatial and temporal climate variability at regional scale can sometimes be important. Spatial observed differences can be explained by the nearness or not of ocean, topography, elevation or latitude… Important climatic nuances are observed in the Loire Valley, one of the big French wine-producing areas, because of its East-West orientation. The oceanic influences close to the coast are gradually deteriorated to the East with more continental influences. As a result various climatic characteristics are observed in the Loire Valley vineyards. Since the middle of the 20th century, a regional warming has been noticed. This warming has been more significant since the end of the 80’s. This increase of temperature is reflected in the bioclimatic indices.

  3. Quel accompagnement infirmier pour la personne âgée à domicile, dans une perspective de placement en EMS?

    OpenAIRE

    Hofmann Hausammann, Sonia

    2008-01-01

    L'objectif de cette étude est de dégager des pistes de réflexion permettant d'améliorer la prise en charge à domicile des personnes âgées devant aller en EMS, en répondant aux questions suivantes: -Quel est le vécu de la personne âgée qui doit être placée en EMS? -Comment l'accompagnement infirmier est-il perçu par la personne âgée? Le jury a notamment relevé la richesse du cadre théorique.

  4. Investigação do transplante heterólogo de quelóide na bolsa jugal do hamster (Mesocricetus auratus

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    Hochman Bernardo

    2003-01-01

    Full Text Available OBJETIVO: Descrever a integração do transplante heterólogo de quelóide no subepitélio da bolsa jugal do hamster (Mesocricetus auratus. MÉTODOS: A amostragem consiste de 18 hamsters machos, não isogênicos, com 10 a 14 semanas de idade. Fragmentos de quelóide foram obtidos de cicatrizes queloideanas da região mamária de paciente adulta parda. Cada hamster foi enxertado em ambas as bolsas com fragmentos de quelóide, totalizando 36 fragmentos enxertados. Os animais foram distribuídos, em 6 grupos, para exame dos fragmentos enxertados com 5, 12, 21, 42, 84 e 168 dias. Uma avaliação macroscópica é realizada comparando a bolsa contendo o fragmento enxertado em cada período com a mesma bolsa no pós-operatório imediato, mediante a comparação de fotografias padronizadas. À microscopia, considera-se a presença de vasos sangüíneos no tecido conjuntivo do fragmento enxertado como critério de integração do mesmo. Outros eventos, como secreção de queratina, presença de infiltrados celulares e aspecto do epitélio e das fibras colágenas do quelóide, também são observados. RESULTADOS: A macroscopia revela intensa vascularização na bolsa até 12 dias de enxertia, e a presença constante de pigmentação castanho-escura nos fragmentos de quelóide enxertados. Na microscopia constata-se a integração dos fragmentos de quelóide pela presença de capilares sangüíneos no tecido conjuntivo. Observa-se, também, a presença de intenso infiltrado celular do tipo inflamatório até 12 dias, a permanência do epitélio do quelóide até 21 dias, e o aparecimento de melanócitos a partir de 42 dias. CONCLUSÃO: A bolsa jugal do hamster representa, a priori, modelo experimental para investigação do quelóide.

  5. Nouveaux pétroles : quel avenir ? Partie 2 New Oil: What's in the Future? Part Two

    Directory of Open Access Journals (Sweden)

    Boy De la Tour X.

    2006-11-01

    Full Text Available PaL'accroissement des prix de 1973 a rendu accessible toute une plage de pétroles chers, mais ces nouveaux pétroles soulèvent encore des problèmes techniques considérables et leur compétitivité économique a été très affectée par le retournement du marché pétrolier. Quel est l'état des technologies ? Que reste-t-il des ambitieux projets conçus dans les années 70 ? Aux horizons 2000/2010, quel sera l'impact de ces nouveaux pétroles, en terme de quantités et au plan stratégique ? Telles sont les questions auxquelles la présente étude tente de répondre. The increase in oil prices in 1973 made an entire range of expensive oil available, but this new oil still raises considerable technical problems, and its economic competitiveness has been greatly affected by the downturn in the oil market. What is the state of the art of existing technologies ? What remains of the ambitious projects conceived in the 1970s? As of 2000/2010, what will the impact of this new oil be in terms of amounts and from the strategic standpoint? These are the questions that the present study attempts to answer.

  6. Estudio de la adsorción de cadmio, níquel y zinc sobre una bentonita natural y homoiónica de sodio

    Directory of Open Access Journals (Sweden)

    Germán Darío Silva Giraldo

    2010-09-01

    Full Text Available Se esmdió la adsorción de cadmio, níquel y zinc, en solución acuosa a 25 "C, sobre una bentonita procedente del Valle del Cauca, tanto en su estado natural como en su forma homoiónica de sodio.

  7. Aplicación de la isoterma langmuir a la adsorción competitiva de cadmio, níquel y zinc sobre una bentonita

    OpenAIRE

    Germán Darío Silva Giraldo; Jorge Alejo Pinzón Bello

    2010-01-01

    Se estudió la adsorción simultánea de los iones cadmio, níquel y zinc en solución acuosa de sus mezclas binarias y ternaria a 25°C, sobre una bentonita del Valle del Cauca, tanto en su estado natural como en su forma homoiónica de sodio.

  8. Analyse rétrospective de l'évolution climatique récente en Afrique du Nord-Ouest

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    Didier Soto

    2011-07-01

    Full Text Available La présente étude vise à évaluer et à comprendre les tendances climatiques récentes et les ruptures de stationnarité au Maroc, en Mauritanie, au Sénégal et sur le proche océan. Pour cela est entreprise une analyse statistique de l'évolution annuelle des températures de l'air, des pressions atmosphériques au niveau de la mer, des précipitations et de la dynamique éolienne.Les analyses confirment le tournant climatique des années 1970-1980. Ainsi les températures varient-elles localement, avec un réchauffement sensible au-dessus de l'Océan Atlantique entre 40°N et 14°N, au Maroc et au Sénégal (région du Nord, alors que le Sud-Est de la Mauritanie se refroidit. De même, le renforcement de la pression atmosphérique est accompagné d'un renversement de l'harmattan, avec une augmentation de la fréquence de sa composante orientale.L'éclairage apporté par les données paléoclimatiques ne permet pas de déterminer une analogie uniforme avec les deux derniers extrêmes climatiques connus (optimum climatique holocène et dernier maximum glaciaire. Le réchauffement littoral et continental, de même que le renforcement de la composante franchement orientale de l'harmattan, rappellent les caractéristiques de la circulation atmosphérique du début de l'Holocène. Cependant l'augmentation des précipitations au cours des dernières années est moins significative. Par ailleurs, le renforcement de la pression atmosphérique suggère, d'un côté, le renforcement de l'agglutination anticyclonique continentale et, d'un autre, un affaiblissement de la dépression saharienne pendant l'été.Le signal climatique s'avère donc complexe à saisir, dans ses dimensions spatiale et temporelle, et requiert d'étendre l'étude à d'autres variables aussi bien qu'à d'autres périodes analogues.The following study aims to evaluate and understand the recent climatic trends and significant stationary breaks in Morocco, Mauritania, Senegal and

  9. 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

  10. Efecto de aditivos en la dureza de los depositos de níquel utilizando corriente pulsante

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    LUIS ARANGO

    2006-01-01

    Full Text Available Este trabajo comprende el estudio experimental del efecto conjunto de la inclusión de aditivos (sacarina de sodio y cloruro de amonio, y la utilización de una onda de corriente rectangular, en la dureza de níquel electro-depositado sobre cobre usando baños Watts y Sulfamato. Se obtuvieron recubrimientos brillantes y con altas durezas con la utilización de sacarina de sodio. El uso de cloruro de amonio produjo depósitos opacos y no tuvo un efecto significativo sobre la dureza. Adicionalmente, son mostrados los cambios morfológicos en la superficie de los electro-depósitos con microscopía de barrido de electrones (SEM.

  11. CARACTERIZACIÓN SUPERFICIAL, ELECTROQUÍMICA Y DE COMPOSICIÓN DE ALEACIONES ZINC NÍQUEL ELECTRODEPOSITADAS

    Directory of Open Access Journals (Sweden)

    ULISES PIRATOBA

    2008-01-01

    Full Text Available La gran demanda de láminas de acero recubiertas con Zinc o con aleaciones de Zinc, es atendida conprocesos de electro deposición en continuo; estos requieren de altas densidades de corriente, obtenidas en electrolitos ácidos. En este trabajo se presenta la composición, morfología superficial y la caracterización electroquímica de aleaciones Zinc Níquel fase gamma sobre láminas de acero, depositadas con altas densidades de corriente. Estas fueron determinadas mediante Análisis de Energía Dispersa de Rayos EDX, Microscopias Electrónica de Barrido SEM y de Fuerza Atómica AFM, e Impedancia Electroquímica EI y polarización Táfel. Se encontraron recubrimientos de grano fino que se pasivan y exhiben un comportamiento anódico frente al sustrato de acero.

  12. Etude du processus de changement vecu par des familles ayant decide d'adopter volontairement des comportements d'attenuation des changements climatiques

    Science.gov (United States)

    Leger, Michel T.

    Les activites humaines energivores telles l'utilisation intensive de l'automobile, la surconsommation de biens et l'usage excessif d'electricite contribuent aux changements climatiques et autres problemes environnementaux. Bien que plusieurs recherches rapportent que l'etre humain est de plus en plus conscient de ses impacts sur le climat de la planete, ces memes recherches indiquent qu'en general, les gens continuent a se comporter de facon non ecologique. Que ce soit a l'ecole ou dans la communaute, plusieurs chercheurs en education relative a l'environnement estiment qu'une personne bien intentionnee est capable d'adopter des comportements plus respectueux de l'environnement. Le but de cette these etait de comprendre le processus d'integration de comportements d'attenuation des changements climatiques dans des familles. A cette fin, nous nous sommes fixe deux objectifs : 1) decrire les competences et les procedes qui favorisent l'adoption de comportements d'attenuation des changements climatiques dans des familles et 2) decrire les facteurs et les dynamiques familiales qui facilitent et limitent l'adoption de comportements d'attenuation des changements climatiques dans des familles. Des familles ont ete invitees a essayer des comportements personnels et collectifs d'attenuation des changements climatiques de sorte a integrer des modes de vie plus ecologiques. Sur une periode de huit mois, nous avons suivi leur experience de changement afin de mieux comprendre comment se produit le processus de changement dans des familles qui decident volontairement d'adopter des comportements d'attenuation des changements climatiques. Apres leur avoir fourni quelques connaissances de base sur les changements climatiques, nous avons observe le vecu de changement des familles durant huit mois d'essais a l'aide de journaux reflexifs, d'entretiens d'explicitation et du journal du chercheur. La these comporte trois articles scientifiques. Dans le premier article, nous presentons une

  13. White book Escrime. Climatic simulation studies; Livre blanc Escrime. Etude des simulations climatiques

    Energy Technology Data Exchange (ETDEWEB)

    Terray, L. [CERFACS, 31 - Toulouse (France); Braconnot, P. [Institut Pierre-Simon Laplace IPSL/LSCE, CEA-Orme des Merisiers, 91 - Gif-sur-Yvette (France)

    2007-01-15

    The ESCRIME project aims to manage the analysis realized on the climatic simulations on the framework of the fourth report of the GIEC (group of intergovernmental experts on the climate evolution), in particularly the simulations based on french models. This white book is constituted by 8 chapters: the global scenario, the climatic sensibility, the variation modes, the regionalization and the extremes, the hydrological cycle, the polar regions and the cryo-sphere, the carbon cycle, detection and attributions. (A.L.B.)

  14. Viscosidad y conductividad de escorias típicas en la producción de ferroníquel

    Directory of Open Access Journals (Sweden)

    Fabio Raúl Pérez Villamil

    2010-12-01

    Full Text Available Cerro Matoso S.A. procesa mineral  laterítico de níquel.Sus  actividades  involucran:  explotación minera, reducción,  fusión vía Arco Eléctrico y  refinación en hornos  tipo  cuchara.  El  producto  ferroníquel  es exportado en su  totalidad. La operación de fusión se realiza en un horno eléctrico, y una de las variables de control de proceso más importante es  la  temperatura de la escoria, que depende de las relaciones de SIO2 y magnesia (MgO, S/M, y de los porcentajes de alúmina(AL2O3. Cuando  la relación S/M es baja, o en  los casos  de  alúminas muy  altas,  las  propiedades  de  la escoria,  como  viscosidad  y  resistividad,  cambian ostensiblemente  y  resulta muy  complicado drenarla del  horno. Con  valores  calculados  de  viscosidad  y conductividad  eléctrica,  a partir  de una  herramienta diseñada  por  la  empresa,  se  procede  a  ubicarcomposiciones  de  escoria  típicas  en  un  diagrama modelo resultante de la operación en el año 2006.

  15. Aleación superficial de superaleaciones base níquel mediante láser

    Directory of Open Access Journals (Sweden)

    Rodríguez, G. P.

    1998-04-01

    Full Text Available Ni based superalloys present a high oxidation resistance at high temperature as well as good mechanical properties. But new tecnhology developments forcé to research in this materials to improve their properties at high temperature. In this work, two Ni based superalloys (Nimonic 80A and Inconel 600 were surface alloyed with aluminium using a high power laser. SEM and EDX were used to study the microstructure of the obtained coatings. Alloyed specimens were tested at 1.273 K between 24 and 250 h. Results showed the generation of a protective and continuous coating of alumina on the laser treated specimens surface that can improve oxidation resistance.

    Las superaleaciones base níquel presentan una elevada resistencia a la oxidación a alta temperatura, así como excelentes propiedades mecánicas. Los nuevos desarrollos tecnológicos (condiciones cada vez más agresivas obligan a una casi continua modificación de dichas aleaciones. En el presente trabajo, dos superaleaciones base níquel (Nimonic 80A e Inconel 600 se alean superficialmente con aluminio utilizando un láser de alta potencia. Se estudia la microestructura de la capas obtenidas mediante SEM y EDX. Se realizan ensayos de oxidación a 1.273 K sobre las probetas aleadas y sobre el material base durante tiempos variables entre 24 y 250 h. Los resultados indican la formación de una capa protectora de alúmina sobre las probetas aleadas que puede incrementar la resistencia a la oxidación.

  16. Humanity faced with climatic change; L'Humanite face au changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Dautray, R.; Lesourne, J

    2009-07-01

    Humanity is for the first time confronted with a global change phenomenon of the eco-sphere which makes her entering a long transition era with at the same time economical, social and political impacts. Every country and every human activity will be impacted. The resulting problems may be solved by changing our way of life, limiting transports and by the large-scale implementation of existing technologies or technologies under development. The challenge is not to reject technology but to intensify the efforts to develop and adapt it according to the real needs of populations. (J.S.)

  17. The understanding of world climate change; Les connaissances sur le changement climatique mondial

    Energy Technology Data Exchange (ETDEWEB)

    Petit, M.

    2008-07-01

    After having recalled that the problem of global warming in relationship with human activities has been studied since the end of the nineteenth century and since then by different scientific programs, the author describes how the IPCC's or Intergovernmental Panel on Climate Change's report is produced. He briefly comments how Earth's temperature is determined and the various natural parameters which influence the climate on Earth. He recalls how the IPCC showed the actual influence of human activities, and which changes have actually been observed

  18. Expertise and governance of climate change; Expertise et gouvernance du changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Encinas de Munagorri, R.; Colson, R. [Nantes Univ. (France); Denis, B. [Saint-Louis Univ. and Free Univ., Brussels (Belgium); Leclerc, O. [Paris Ouest-Nanterre La Defense Univ. (France); Rousseau, S. [CNRS, Lab. Droit et Changement Social (France); Torre-Schaub, M. [CNRS, Lab. Institutions et Dynamiques Historiques de l' Economie, Ecole Normale Superieure, Cachan (France)

    2009-07-01

    Global warming has become in few years a prominent problem which requires the implementation of a world governance to be solved. However, the share of human activities in the global warming phenomenon and the actions susceptible to mitigate the greenhouse gases emission generate scientifical, political and legal conflicts at the same time. Assessing the taking into account of climate change by international institutions raises several questions. By what process a true fact can become established at the world scale? Are experts free or constrain by procedure rules? How to regulate the worldwide carbon trade? Is the governance requirement foreseen in international systems respected by decision making practices? How to explain experts' omnipresence in the observance mechanisms of climate change treaties? Is their influence determining, at the international and internal scale, in the elaboration of a climate law? These questions, analyzed by researchers in law and political science, are indissociable of method stakes with an inter-disciplinary horizon. This book, result of a collective work, is not limited to a description of standards and actors' practices in force. Its ambition is to apprehend law, science and politics in their interactions. Climate change is an appropriate topic to think about the links between the different scientific disciplines. The book concludes with a prospective about the contribution of laws analysis to expertise which involves the dogmatic, realistic and epistemologic aspects. (J.S.)

  19. Les changements climatiques : vulnérabilité, impacts et adaptation dans le monde de la médecine traditionnelle au Burkina Faso

    OpenAIRE

    Benoît, Élisabeth

    2008-01-01

    Au cours des dernières décennies, le Burkina Faso, pays du Sahel, a fait face à un enchaînement d'événements climatiques «extrêmes» d'une ampleur et d'une rapidité sans précédent. On peut penser notamment aux périodes de sécheresse des trois dernières décennies dont les années les plus touchées furent 1973-74 et 1983-84 et qui ont grandement affectés les écosystèmes ainsi que les systèmes de production burkinabés. (Burkina Faso, 1999a) La désertification que connaît le pays a de lourdes consé...

  20. Modelisation de l'erosion et des sources de pollution dans le bassin versant Iroquois/Blanchette dans un contexte de changements climatiques

    Science.gov (United States)

    Coulibaly, Issa

    Principale source d'approvisionnement en eau potable de la municipalite d'Edmundston, le bassin versant Iroquois/Blanchette est un enjeu capital pour cette derniere, d'ou les efforts constants deployes pour assurer la preservation de la qualite de son eau. A cet effet, plusieurs etudes y ont ete menees. Les plus recentes ont identifie des menaces de pollution de diverses origines dont celles associees aux changements climatiques (e.g. Maaref 2012). Au regard des impacts des modifications climatiques annonces a l'echelle du Nouveau-Brunswick, le bassin versant Iroquois/Blanchette pourrait etre fortement affecte, et cela de diverses facons. Plusieurs scenarios d'impacts sont envisageables, notamment les risques d'inondation, d'erosion et de pollution a travers une augmentation des precipitations et du ruissellement. Face a toutes ces menaces eventuelles, l'objectif de cette etude est d'evaluer les impacts potentiels des changements climatiques sur les risques d'erosion et de pollution a l'echelle du bassin versant Iroquois/Blanchette. Pour ce faire, la version canadienne de l'equation universelle revisee des pertes en sol RUSLE-CAN et le modele hydrologique SWAT ( Soil and Water Assessment Tool) ont ete utilises pour modeliser les risques d'erosion et de pollution au niveau dans la zone d'etude. Les donnees utilisees pour realiser ce travail proviennent de sources diverses et variees (teledetections, pedologiques, topographiques, meteorologiques, etc.). Les simulations ont ete realisees en deux etapes distinctes, d'abord dans les conditions actuelles ou l'annee 2013 a ete choisie comme annee de reference, ensuite en 2025 et 2050. Les resultats obtenus montrent une tendance a la hausse de la production de sediments dans les prochaines annees. La production maximale annuelle augmente de 8,34 % et 8,08 % respectivement en 2025 et 2050 selon notre scenario le plus optimiste, et de 29,99 % en 2025 et 29,72 % en 2050 selon le scenario le plus pessimiste par rapport a celle

  1. Differentiation, international equity and efficiency in the fight against the global climatic change; Differenciation, equite internationale et efficacite dans la lutte contre le changement climatique global

    Energy Technology Data Exchange (ETDEWEB)

    Blanchard, O.; Criqui, P.; Viguier, L. [Institut d' Economie et de Politique de l' Energie - IEPE-CNRS/ Universite Pierre Mendes-France, 38 - Grenoble (France); Trommetter, M. [Institut National de Recherches Agronomiques (INRA), 38 - Grenoble (France)

    1998-05-01

    The first difficulty to get over in the international negotiation on the climatic change, has been and still remain the distribution of the efforts and the research of the equity in the objective determination. This paper analyzes the possible consequences of the negotiable emission licenses in terms of efficiency and equity. The first part is a review of the different charts of the objectives differentiation discussed or proposed in the international negotiation process on the greenhouse effect. It aims to find a bond between the the charts and the equity. The second part deals with the programs cost and their relative efficiency, taking into account the marginal cost curves. (A.L.B.)

  2. Climatic change and security stakes; Changement climatique et enjeux de securite

    Energy Technology Data Exchange (ETDEWEB)

    Ambrosi, Ph.; Hallegatte, St

    2006-07-01

    This paper explores the relationships between climate change and security. Potential threats from climate change, as a unique source of stress or together with other factors, to human security are first examined. Some of the most explicit examples illustrate this section: food security, water availability, vulnerability to extreme events and vulnerability of small islands States and coastal zones. By questioning the basic needs of some populations or at least aggravating their precariousness, such risks to human security could also raise global security concerns, which we examine in turn, along four directions: rural exodus with an impoverishment of displaced populations, local conflicts for the use of natural resources, diplomatic tensions and international conflicts, and propagation to initially-unaffected regions through migratory flows. (authors)

  3. The climate fraud: or the false ecology; L'imposture climatique: ou la fausse ecologie

    Energy Technology Data Exchange (ETDEWEB)

    Allegre, C.

    2010-07-01

    Following the bank crisis that has shaken the world and still does so, a real climate panic was on the point to amplify its effects. Hopefully, at the Copenhagen summit, thanks to the southern countries sustained by the US President B. Obama, the wisdom finally won, but for how long? This provocative book shows how a real conspiracy, mixing science and politics, has been able to impose the global warming myth to politicians and mass media. It demonstrates how the scientifical and political ambitions of some individuals have been able to count on active money-making, on the United Nations' techno-structure, and on the mysticism to foster fear and culpability among the populations. This well-documented book reveals without hackneyed phrases the keys of what is going to be the very first worldwide scandal

  4. Ireland and climate change; L'Irlande et le changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Rzepski, G.; Lerouge, Ch.

    2010-05-15

    As the rise of sea level, the higher frequency of tempests, and the threat of water shortages in some parts of the country are the major stakes for Ireland in the struggle against climate change, this report gives an overview of greenhouse gas emissions in this country (globally and per sector) and of their evolution. It presents the Irish policy to struggle against climate change since 2000, its public actors (ministries, agencies), its different action plans (National Climate Change Strategy, energy sector planning, promotion of renewable energies, transport sector planning), and sector-based and tax measures implemented in Ireland. It discusses the limitations of the current policy (insufficient results, limited domestic measures, socioeconomic obstacles, complex political steering), describes the new European context and the present Irish context (economic crisis). Some new orientations are discussed

  5. Economics of adaptation to climate change; Economie de l'adaptation au changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Perthuis, Ch.; Hallegatte, St.; Lecocq, F.

    2010-02-15

    This report proposes a general economic framework for the issue of adaptation to climate change in order to help public and private actors to build up efficient adaptation strategies. It proposes a general definition of adaptation, identifies the major stakes for these strategies, and discusses the assessment of global costs of adaptation to climate change. It discusses the role and modalities of public action and gives some examples of possible adaptation measures in some important sectors (building and town planning, energy and transport infrastructures, water and agriculture, ecosystems, insurance). It examines the regional and national dimensions of adaptation and their relationship, and defines steps for implementing an adaptation strategy. It describes and discusses the use of economic tools in the elaboration of an adaptation strategy, i.e. how to take uncertainties into account, which scenarios to choose, how to use economic calculations to assess adaptation policies

  6. Eau et changement climatique. Tendances et perceptions en Afrique de l’Ouest

    OpenAIRE

    OZER Pierre; Perrin, Dominique

    2014-01-01

    L’Afrique de l’Ouest, plus spécifiquement sa frange semi-aride que constitue le Sahel, a connu, au cours de ces dernières décennies, deux crises majeures de sécheresse presque contiguës dans les années 1970 et 1980. Cependant, depuis les années 1990, les tendances pluviométriques montrent globalement un retour vers des moyennes antérieures aux années 1970. Toutefois, cette amélioration des totaux pluviométriques annuels semble être partiellement le fait d’une intensité des pluies plus importa...

  7. The french researches on the climatic change; Les recherches francaises sur le changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-07-01

    Scientists were the first to prevent decision makers on the risk of the climatic change bond to the greenhouse gases emissions. The results of the third GIEC report confirmed that the main part of the global warming of the last 50 years is due to the human activities. This document presents the major results of the french researches during the last five years: the planet observation, the climate evolution study, the simulation of the future climate, the climatic change in France, the impacts of the climatic change on the marine and earth biosphere, the climatic risks and the public policies, the health impacts, the 2003 heat and the research infrastructures. (A.L.B.)

  8. Síntese e caracterização de materiais mesoporosos modificados com níquel para a captura de CO2

    Directory of Open Access Journals (Sweden)

    A. R. Nascimento

    2014-12-01

    Full Text Available Materiais mesoporosos tipo SBA-15 e MCM-48 foram sintetizados com sucesso pelo método hidrotérmico e impregnados com níquel nas proporções de 5-20 peso% visando à captura de CO2. Os materiais obtidos foram caracterizados por meio de análise por difração de raios X, adsorção de N2 e microscopia eletrônica de varredura. Testes de captura de CO2 foram conduzidos em pressões entre 100 e 4000 KPa à temperatura constante de 298 K e revelaram que as capacidades de adsorção variam significativamente com as propriedades texturais dos materiais com diferentes teores de níquel, atingindo valores máximos de 14,89 e 9,97 mmol g-1 para MCM-48 e SBA-15, respectivamente.

  9. Impacts potentiels d'un changement climatique sur le pergelisol dans le nord canadien

    Science.gov (United States)

    Obretin, Calin

    climate data by using a Determined Stochastic Model, ii) the integration of soil type, iii) the integration of the soil humidity, iv) the integration of the values of thickness of the snow layer and v) the integration of remote sensing data (SSM/I). As a rule, the results obtained by the TTOP-A model reveal that the mean values of temperature at the surface of the permafrost follow closely the values of air temperature and that they are similar to those found by Smith and Riseborough (1996) and Heginbottom and coll. (1995). Also, the differences of the values of temperature on the surface of permafrost between 2010 and 2100 are similar to the values published by the Intergovernmental Panel on Climate Change (IPCC). Concerning the second objective of this thesis, the spatio-temporal dynamics of the permafrost until 2100 demonstrates that, in the study zone, the surface perturbed by global warming will be 37 %, 60 % and 29 % according to the scenarios CGCM3 SRES A1B, CGCM3 SRES A2 and CGCM3 SRES B1 respectively. The permafrost layer inside this zone will disappear by 20 %, 32 % and 18 % according to the scenarios mentioned before. These results lead us to believe that the estimations made by Smith and Riseborough were overvalued in the context of two of three current climates scenarios compared to that of the 1996. Finally, this study demonstrates that the method of downscaling of climate data using the neuronal network within a Determined Stochastic Model gives good results and it represents a reliable option which lends itself to large-scale generalizations. Keywords: permafrost, downscaling, snow, soil humidity, climate scenarios, neuronal network, Determined Stochastic Model, climate change, CGCM3, TTOP. 2The third generation Coupled Global Climate Model [CCCma, 2010].

  10. Balance energético del calcinador de carbonato básico de níquel con adición de sulfuro de níquel: consideraciones metodológicas

    Directory of Open Access Journals (Sweden)

    Manuel Ortiz-Rivas

    2003-03-01

    Full Text Available En las empresas niqueleras cubanas de tecnología carbonato-amoniacal se realiza la calcinación del Carbonato Básico de Níquel (CBN con adición del NiS, que se recupera del efluente generado en la destilación del licor producto (LP de la lixiviación. Esta nueva situación introdujo una modificación en la operación del horno, por lo que se realizó una investigación a escala industrial para establecer una metodología de balance energético que permitiera determinar la nueva norma de consumo de combustible, verificar la relación de masa CBN/NiS previamente establecida y diagnosticar el proceso energético en el horno de tambor rotatorio industrial. Se demuestra que la metodología de balance empleada es válida y que la relación másica de CBN/NiS = 3/1 es óptima.

  11. Le changement climatique, un défi pour la recherche : l’exemple de l’initiative « 4 ‰ »

    Directory of Open Access Journals (Sweden)

    Torquebiau Emmanuel

    2017-01-01

    Full Text Available L’agriculture, l’activité humaine probablement la plus dépendante du climat, est à la fois victime et responsable du changement climatique mais elle peut aussi être une solution à la crise du changement climatique. C’est dans les pays en développement, particulièrement vulnérables, que les effets du changement climatique seront les plus violents. L’agriculture émet des gaz à effet de serre, mais il est possible de diminuer ces émissions par des pratiques agro écologiques favorisant l’augmentation de la matière organique du sol. Il est également possible, grâce à ces pratiques, d’augmenter la capture de carbone atmosphérique en fixant du carbone dans le sol et ainsi contribuer à l’atténuation du changement climatique, tout en améliorant les propriétés du sol, ce qui permet simultanément d’améliorer l’adaptation de l’agriculture au changement climatique. Une augmentation de la teneur en carbone de tous les sols du monde de 4 ‰ par an permettrait de compenser toutes les émissions de gaz à effet de serre d’origine anthropique. L’initiative internationale d’origine française « 4 ‰, Les Sols pour la Sécurité Alimentaire et le Climat » se donne pour objectif de mettre en œuvre des projets permettant de montrer qu’il est possible d’augmenter la teneur en carbone du sol dans ces proportions et de répondre aux questions de recherche que cela pose, notamment en matière de mesure du taux de carbone dans le sol, de pratiques agronomiques pertinentes, du contexte socio-économique favorable à cette démarche et enfin du suivi dans le temps des changements induits.

  12. Elución de iones de níquel desde esferas de alginato en un medio ácido

    Directory of Open Access Journals (Sweden)

    Aracena, Alvaro

    2016-03-01

    Full Text Available Elution of nickel ions from alginate beads was studied in a temperature range of 2 to 80 °C and a sulfuric acid concentration between 0.005 to 2.5 g L−1. The elution mechanism was established by ion exchange between nickel and ions protons, obtaining a value of 93% elution at a temperature of 80 °C and a H2SO4 concentration of 0.25 g L−1. The influence of other acids on nickel elution was also studied. The nickel elution rate was significantly influenced by temperature and concentration of H2SO4. Elution kinetics of nickel ions was studied, and the 1-(1-α1/3=kappt model properly described the kinetics of this reaction. The dependence of nickel elution on the sulfuric acid concentration was of the order of 0.33. Moreover, the intrinsic rate constants were determined and an activation energy value of 54.5 kJ mol−1 was obtained for the temperature range studied. The results indicated that the nickel elution is a process controlled by chemical reactions.Se estudió la elución de iones de níquel desde esferas de alginato en un intervalo de temperaturas de 2 a 80 °C y una concentración de ácido sulfúrico entre 0,005 a 2,5 g L−1. El mecanismo de elución fue establecido por intercambio iónico entre protones e iones de níquel alcanzando valores de elución de 93% a una temperatura de 80 °C y concentración de H2SO4 de 0,25 g L−1. También se estudió la influencia de otros ácidos sobre la elución de níquel. La velocidad de elución de níquel fue significativamente influenciada por la temperatura y concentración de H2SO4. La cinética de elución de iones de níquel fue estudiada y el modelo 1-(1-α1/3=kappt describió muy bien la cinética de esta reacción. La dependencia de la elución de níquel sobre la concentración de ácido sulfúrico fue del orden de 0,33. Además, fueron determinadas las constantes de velocidad intrínseca y se obtuvo un valor de energía de activación de 54,5 kJ mol−1 para el intervalo de

  13. Resistência de união entre liga de níquel-cromo e cimentos resinosos

    Directory of Open Access Journals (Sweden)

    FRANÇA Rodrigo de Oliveira

    1998-01-01

    Full Text Available O objetivo do trabalho foi a determinação da retentividade, por ensaio de tração, entre uma liga de níquel-cromo e cimentos resinosos (Comspan, Panavia Ex e All-Bond C & B, com quatro tratamentos superficiais (liso, microjateado, ataque eletrolítico e silicoater e armazenagem por 3 e 30 dias em solução de NaCl a 0,9%, a 37° C e termociclagem intercalada na segunda (a 5 e 55° C, por 1 minuto em cada banho, perfazendo 600 ciclos. Os corpos de prova eram discos, providos de alça fixadora entre si dois a dois. Os resultados permitiram concluir que: superfícies lisas conduzem a baixíssimas retentividades e tratadas com silicoater a altíssimos valores, com qualquer cimento e condição de armazenagem; Panavia Ex com superfícies microjateadas também conduz a altas retentividades; a maior retentividade foi obtida pela combinação silicoater/All-Bond C&B.

  14. The domestic wastes incinerators; Les incinerateurs d'ordures menegares: quels risques? quelles politiques?

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-10-01

    This document presents the opinion of the Committee of Prevention and Precaution (CPP), on the domestic wastes incinerators, in the framework of the global wastes policy. The seven chapters detail and bring advices on the following topics: the elements which are going in and out of the incinerators, the technical processes, the occupational activities and the risks bound to the incinerators use, the transfer modes towards the different environmental areas, the exposure estimation, the risks of people living near the domestic wastes incinerators compared to the other concerning a cancer development, the legislation concerning the domestic wastes and the social acceptability of the incinerators. (A.L.B.)

  15. Estudo da proliferação linfocitária em pacientes sensibilizados ao níquel Study on lymphocyte proliferation in nickel sensitive patients

    Directory of Open Access Journals (Sweden)

    Ana Paula Galli Sanchez

    2005-04-01

    Full Text Available FUNDAMENTO: O diagnóstico da alergia ao níquel é estabelecido com a realização do teste de contato. OBJETIVO: Desenvolver um método diagnóstico mais sensível e específico. CASUÍSTICAS E MÉTODOS: Dezenove pacientes com teste de contato positivo para o níquel e 25 controles foram submetidos ao teste da proliferação linfocitária. As células mononucleadas foram isoladas do sangue venoso periférico e cultivadas em triplicatas, em placas de cultura (2x10(5 células/orifício com: meio de cultura apenas; sulfato de níquel (156,25; 78,13; 19,53; 9,77 e 2,44µM e concentrações ideais do antígeno Candida albicans e dos mitógenos pokeweed, fito-hemaglutinina A e anticorpo anti-CD3 (OKT3. Timidina tritiada foi adicionada às placas, a radioatividade incorporada pelas células medida e os resultados expressos pelo índice de estimulação (IE. RESULTADOS: A resposta proliferativa dos linfócitos dos casos foi superior à dos controles em todas as concentrações de níquel testadas. Considerando teste positivo para níquel quando IE > 3, nenhum dos controles e 16 (84,21% dos casos apresentaram teste positivo em pelo menos uma das cinco concentrações usadas. As respostas à Candida albicans e aos mitógenos foram semelhantes nos casos e controles, demonstrando a integridade da imunidade celular em ambos os grupos. CONCLUSÃO: O teste da proliferação linfocitária mostra-se útil no diagnóstico da alergia ao níquel.BACKGROUND: The diagnosis of nickel sensitivity is made by epicutaneous patch testing. OBJECTIVE: To develop a more sensitive and specific test. PATIENTS AND METHODS: Nineteen patients with positive patch test reactions to nickel and 25 controls were submitted to lymphocyte proliferation test. Mononuclear cells were isolated from peripheral venous blood and cultivated in triplicate in culture plates (2x10(5 cells/well with: culture medium only, nickel sulfate (156.25; 78.13; 19.53; 9.77 and 2.44µM and optimal

  16. Sinterização por micro-ondas de ferrita de níquel sintetizada pelo método Pechini

    Directory of Open Access Journals (Sweden)

    J. R. Muñoz Hoyos

    2013-09-01

    Full Text Available A sinterização por micro-ondas é uma técnica que oferece enorme potencial para a fabricação de diversos materiais cerâmicos com microestruturas cerâmicas diferenciadas. Este trabalho teve por objetivo sinterizar cerâmicas de ferrita de níquel (NiFe2O4 em forno de micro-ondas, visando controle de crescimento de grão e alta densificação. Para realizar esta investigação, foi utilizado o processo de síntese por Pechini para a preparação do pó das ferritas de níquel. Amostras desse material foram sinterizadas em forno convencional e de micro-ondas. A caracterização foi feita por difração de raios X, microscopia eletrônica de varredura, determinação de densidade aparente e obtenção das curvas de histerese magnética. A sinterização da ferrita de níquel por micro-ondas levou apenas 10% do tempo gasto da sinterização convencional. As amostras apresentaram menor tamanho de grão, e densidade e magnetização de saturação semelhantes às obtidas pela sinterização convencional, mostrando o alto potencial de aplicação da técnica de micro-ondas para o processamento desses materiais.

  17. Quels rapports entre tournesols, santé publique et territoires ?

    Directory of Open Access Journals (Sweden)

    Sausse Christophe

    2011-11-01

    Full Text Available The ragweed (Ambrosia artemisiifolia L. is usually known by farmers as a detrimental weed in spring crops, especially sunflower. But it is also known more generally as a public health issue due to its allergenic pollen. The fight against ragweed implies new methods out of the scope of those usually used by agronomists. It does not concern only the cultivated field but the whole territory, not only the farmers but a group of actors not always sharing the same point of view. In order to deal with this complex situation, we built a monitoring dashboard and tested it in the context of a small territory near Lyon (France. This tool allowed the local decision makers to be informed about the management practices, the measures implemented, and their efficiency. The assessments made in 2005 and 2007 usefully highlighted some critical points, such as the management of inter cropping periods on agricultural areas. This monitoring methodology faces some practical problems and still needs to be improved. However, it presents several advantages : the adaptation to local conditions can complement or provide an alternative to approaches based only on regulation. The lessons learned at the local level in the context of this pilot operation can also lead to a global improvement of ragweed control methods.

  18. Quels conflits d'intérêts sont-ils constitutifs de gestion déloyale (art. 158 CP) ?

    OpenAIRE

    Deuel, Michael

    2013-01-01

    Ce travail examine quels types de conflits d'intérêts ont une pertinence pénale au regard de l’art. 158 CP relatif à la gestion déloyale. Les deux infractions décrites à l'art. 158 CP sont présentées et quatre types de conflits d'intérêts, pertinents dans le cas de conseils d'administration, sont décrits. Enfin, des situations dans lesquels ils peuvent constituer une infraction de gestion déloyale sont analysées.

  19. Estudio de la resistencia a la corrosión electroquímica de electro-recubrimientos níquel/cobre obtenidos por corriente pulsante

    OpenAIRE

    William Aperador Chaparro; Enrique Vera López; Alejandro Vargas Uscategui

    2010-01-01

    En este artículo se presenta la obtención de recubrimientos de cobre-níquel sobre sustratos de zamak por medio de electrodeposición, utilizando las técnicas de corriente directa, corriente pulsante directa y corriente pulsante inversa, con el propósito de estudiar el comportamiento de cada una frente a los fenómenos corrosivos simulando un medio marino (NaCl al 3,5% wt). La caracterización electroquímica se realizó mediante las técnicas de espectroscopia de impedancias electroquímica (EIS) y ...

  20. Síntesis de bis (dietilamino glioxima y su compuesto de coordinación con níquel (II

    Directory of Open Access Journals (Sweden)

    R. Cueto

    2010-05-01

    Full Text Available Se sintetizó y caracterizó el bis(bis(dietilaminoglioximato níquel(ll, compuesto no reportado en la literatura; el complejo cristalizó formando agujas. Se sintetizó y caracterizó la bis(dietilaminoglioxima. La estructura propuesta por nosotros difiere de la propuesta por Walstra, Trompen y Hackman para el mismo compuesto. Basados en el análisis elemental, espectrometría de masas, espectroscopia IR y R M N - 1 H se logró la identificación y caracterización de los compuestos mencionados anteriormente.

  1. Precipitación de los sulfuros de níquel y cobalto a partir de soluciones carbonato amoniacales sintéticas

    OpenAIRE

    Miguel Garrido-Rodríguez; Neicis capote-Flores; Omar Lobaina-Oduardo; Eulicer Fernández-Maresma

    2001-01-01

    Se estudió la eficiencia de la precipitación selectiva del Co a partir de soluciones carbonato amoniacales sintéticas utilizando como agentes precipitantes el hidrógeno sulfuro de amonio y el hidrógeno sulfuro de sodio. El estudio realizado permitió identificar los factores de mayor influencia en el desarrollo de las reacciones de precipitación de cobalto y de níquel, determinar los modelos estadísticos matemáticos que caracterizan las reacciones de precipitación del cobalto y comparar la efi...

  2. Rencontre avec Stéphane Simonian à propos de son ouvrage « Hypertexte et processus cognitifs, quels enjeux pour l’apprentissage »

    Directory of Open Access Journals (Sweden)

    Stéphane Simonian

    2011-06-01

    Full Text Available Stéphane Simonian vient de publier chez Lavoisier un ouvrage intitulé Hypertexte et processus cognitifs, quels enjeux pour l’apprentissage ? Cette publication, partiellement issue de sa thèse, est enrichie par des compléments originaux notamment en matière de scénarisation dans l’enseignement à distance par Internet.Introduction. Chapitre 1. Hypertexte : définitions, caractéristiques et premiers enjeux. Chapitre 2. Hypertexte : intérêts et limites des recherches en sciences cognitives pour l'...

  3. Caracterización superficial, electroquímica y de composición de aleaciones zinc níquel electrodepositadas

    OpenAIRE

    ULISES PIRATOBA; ENRIQUE VERA; CESAR ORTIZ

    2008-01-01

    La gran demanda de láminas de acero recubiertas con Zinc o con aleaciones de Zinc, es atendida conprocesos de electro deposición en continuo; estos requieren de altas densidades de corriente, obtenidas en electrolitos ácidos. En este trabajo se presenta la composición, morfología superficial y la caracterización electroquímica de aleaciones Zinc Níquel fase gamma sobre láminas de acero, depositadas con altas densidades de corriente. Estas fueron determinadas mediante Análisis de Energía Disp...

  4. Les changements climatiques du Paléolithique Supérieur. Enquête sur le rapport entre Paléoclimatologie et Préhistoire

    Directory of Open Access Journals (Sweden)

    María Fernanda SÁNCHEZ GOÑI

    2009-12-01

    Full Text Available ABSTRACT: This article discusses the contribution of sedimentology, palynology and palaeontology from archaeological sequences in caves to palaeoclimatic reconstruction. The chronoclimatic framework traditionally accepted for the upper Palaeolithic is questioned. A particular attention is paid to the history of vegetation and climate during the upper Palaeolithic in western Europe. There is no evidence for temperate oscillations between 23,000 and 14,000 BP, a period in which the Gravetian, Solutrean and lower and middle Magdalenian technocomplexes developed.RÉSUMÉ: Ce travail discute de l'apport que la sédimentologie, la palynologie et l'étude de la macrofaune des séquences archéologiques en grotte offrent pour la reconstitution paléoclimatique. Le cadre chronoclimatique traditionnellement admis pour le Paléolithique supérieur est remis en question. Une attention particulière est adressée à l'histoire de la végétation et du climat contemporains du Paléolithique supérieur d'Europe occidentale. Aucune période d'amélioration climatique est détectée entre 23.000 et 14.000 ans BP, période au cours de laquelle se développent en partie les technocomplexes Gravettien, Solutréen, Magdalénien inférieur et moyen.

  5. OGM Diffusion des OGM et impact pour les agriculteurs : quels sont les liens ?

    Directory of Open Access Journals (Sweden)

    Lemarie Stéphane

    2001-05-01

    Full Text Available Les OGM actuellement sur le marché présentent des innovations sur des fonctions de protection des plantes. Selon les problèmes de protection des plantes, les gains des agriculteurs liés à l’adoption des OGM sont très variables. Cette hétérogénéité pose d’importants problèmes méthodologiques pour pouvoir estimer correctement la distribution des gains pour l’ensemble des agriculteurs. Une synthèse de plusieurs études américaines est réalisée ici et met bien en évidence la diversité des méthodes utilisées, chacune d’elles présentant ses avantages et ses limites. Globalement, si la diffusion des OGM est un fait indéniable, les études ne permettent pas de tirer des conclusions aussi nettes quant à l’impact des OGM pour tous les agriculteurs qui adoptent ces produits, et cela en particulier pour le soja. Cette absence de conclusion s’explique en grande partie par la difficulté à mesurer certains facteurs qui influencent le comportement d’adoption, comme par exemple la simplification de la conduite des cultures. En contrepartie, il faut noter que les études présentées ici ne prennent pas en compte un certain nombre d’effets indirects qui peuvent faire diminuer les gains des agriculteurs.

  6. Etude des impacts à long terme du changement climatique et de l'adaptation de la filière viti-vinicole française : projet Laccave

    OpenAIRE

    Nathalie Ollat; Jean-Marc Touzard

    2013-01-01

    Plus que d’autres productions agricoles, la viticulture et l’ensemble de la filière vinicole française devront faire face à l’enjeu majeur du changement climatique. Compte tenu de l’importance socio-économique de cette filière et des spécificités de la viticulture au regard du climat, du territoire et de l’innovation technologique, l’INRA a jugé important de mettre en oeuvre un nouveau programme scientifique pluridisciplinaire (« métaprogramme ») pour étudier les impacts du changement clim...

  7. Etude des impacts à long terme du changement climatique et de l'adaptation de la filière viti-vinicole française : projet Laccave

    OpenAIRE

    Ollat, Nathalie; Touzard, Jean-Marc

    2013-01-01

    Plus que d’autres productions agricoles, la viticulture et l’ensemble de la filière vinicole française devront faire face à l’enjeu majeur du changement climatique. Compte tenu de l’importance socio-économique de cette filière et des spécificités de la viticulture au regard du climat, du territoire et de l’innovation technologique, l’INRA a jugé important de mettre en oeuvre un nouveau programme scientifique pluridisciplinaire (« métaprogramme ») pour étudier les impacts du changement climati...

  8. Base de données multifactorielle de l’incidence des facteurs agro-climatiques sur l’intensité de la fusariose et sur les teneurs en fusariotoxines

    OpenAIRE

    Pennetier, Alexandre; FLEURAT-LESSARD, Francis

    2007-01-01

    Un des objectifs du projet « RARE fusariotoxines » était la constitution d’une base de données multidimensionnelle contenant les différents facteurs intervenant dans la variabilité des teneurs en toxines fusariennes dans le grain à maturité, en vue de la modélisation de la production de fusariotoxines résultant des interactions multiples entre les paramètres agro-climatiques, environnementaux, génétiques et écophysiologiques. La base de données a été construite à partir des informations prove...

  9. Metodología para el diseño de indicadores económico-ambientales en la minería de níquel

    Directory of Open Access Journals (Sweden)

    Clara L. Reynaldo-Argüelles

    2012-06-01

    Full Text Available En las empresas mineras de la industria del níquel en Cuba la eficiencia económica se evalúa mediante dos únicos indicadores que no incluyen el análisis de la dimensión ambiental. En este artículo se realiza un estudio comparativo de los métodos internacionalmente aplicados para evaluar impactos ambientales con el fin de proponer una metodología que incluya indicadores económico-ambientales para la minería del níquel. La metodología que se propone formula nueve indicadores que, basados esencialmente en los costos, permiten medir la responsabilidad ambiental de las empresas. La aplicación de estos indicadores minimiza la incidencia de los costos de la actividad minera en el costo total de la empresa, facilita la planificación, el uso adecuado y el control de los recursos naturales, y la asunción de conductas responsables hacia el entorno.

  10. Keloid heterograft in the hamster (Mesocricetus auratus cheek pouch Heteroenxerto de quelóide na bolsa jugal do hamster (Mesocricetus auratus

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    Bernardo Hochman

    2005-06-01

    Full Text Available PURPOSE: To study the integration of keloid heterograft in hamster (Mesocricetus auratus cheek pouch. METHODS: The sample is formed by 18 male hamsters, heterogenic ones, aged between 10 and 14 weeks. Keloid fragments were obtained from keloid scars of the breast region of adult female mulatto patient. Each hamster received keloid fragments into both of its pouches, in a total of 36 grafted fragments. Animals were distributed into 6 groups for having their grafts assessed in the days 5, 12, 21, 42, 84, and 168. A macroscopic assessment is performed by comparing the pouch containing the grafted fragment, at each time point, with the same pouch in the immediate post surgical moment through a comparison of standardized photographs. Under microscope, the presence of blood vases is considered within the conjunctive tissue of the grafted fragment, as a criterion of its integration. Other events, as keratin secretion, the presence of cellular infiltrated, epithelium and keloid collagen fibers aspects are also analyzed. RESULTS: Macroscopy reveals intensive vascularization of the pouch up to 12 days from the transplantation and the presence of constant dark brown pigmentation on the grafted keloid fragments. In microscopy, the integration of keloid fragments is considered by the presence of blood capillary vases within conjunctive tissue. The presence of intensive cellular inflammatory type infiltrated up to 12 days is also observed, as well as the remaining of keloid epithelium up to 21 days, and the appearing of melanocytes from the day 42. CONCLUSION: Hamster cheek pouch represents, a priori, an experimental model for the investigation of keloid.OBJETIVO: Investigar a integração do transplante heterólogo de quelóide na bolsa jugal do hamster (Mesocricetus auratus. MÉTODOS: A amostragem consiste de 18 hamsters machos, heterogênicos, com 10 a 14 semanas de idade. Fragmentos de quelóide foram obtidos de cicatrizes queloidianas da região mam

  11. Teor de nutrientes em mudas de cedro (Cedrela fissilis Vell. submetidas a doses crescentes de níquel, em solução nutritiva

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    Paiva Haroldo Nogueira de

    2002-01-01

    Full Text Available O efeito da aplicação de níquel sobre o teor de nutrientes na raiz, no caule e nas folhas de mudas de cedro (Cedrela fissilis Vell. foi estudado em um experimento realizado em casa de vegetação do Departamento de Ciência do Solo da Universidade Federal de Lavras. As mudas foram cultivadas em solução nutritiva de Clark e submetidas a doses crescentes de Ni: 0, 42, 84, 169 e 252 mimol. O experimento foi conduzido em delineamento estatístico de blocos ao acaso, e após 60 dias de exposição ao metal pesado foram feitas avaliações do teor de macro e de micronutrientes na matéria seca de raiz, caule e folha. Os resultados mostraram que a aplicação de níquel aumentou o teor de P, praticamente não afetou o teor de K e de S, no entanto reduziu o teor de Ca e de Mg. Os teores de Cu, Fe e Mn, de modo geral, sofreram redução, ao passo que o teor de Zn foi pouco afetado. O teor de Ni, na matéria seca de raiz, caule e folha, elevou-se com o aumento das doses deste metal pesado, que mostrou ser móvel nas plantas analisadas.

  12. Conférence extérieure - Université de Genève: La modélisation numérique des extrêmes climatiques: Projections pour l'Europe et la Suisse d'ici 2100 - French version only

    CERN Multimedia

    2006-01-01

    Université de Genève Ecole de physique 24 quai Ernest Ansermet 1211 Genève 4 Tél : + 41 22 379 63 83 (secrétariat) Tél : + 41 22 379 62 56 (réception) Fax: + 41 22 379 69 22 Lundi 15 janvier 2007 17 heures - Auditoire Stueckelberg La modélisation numérique des extrêmes climatiques: Projections pour l'Europe et la Suisse d'ici 2100 Prof. Martin Beniston / Chaire de Climatologie de l'Université de Genève Les nombreuses catastrophes liées au climat (canicule 2003 en Europe; inondations en Suisse en 2005; sécheresse en Australie; ouragans Katrina, etc.) donnent l'impression que les catastrophes climatiques qui touchent de nombreuses parties du monde sont la preuve du réchauffement climatique. A voir... Pourtant, les changements climatiques représentent l'un des thèmes de préoccupation majeure de ce début du 21e siècle, du moins pour les scientifiques sinon pour le monde politique. Car si l'ampleur, et surtout la rapidité du changement, sont aussi importants que ce que laissent entrevoi...

  13. Ineffectiveness of Nickel in augmenting the hepatotoxicity in protein deficient rats Eficacia del níquel en aumentar la hepatotoxicidad en ratas con deficiencia en proteínas

    Directory of Open Access Journals (Sweden)

    P. Sidhu

    2005-12-01

    deficient animals was also significantly higher when compared to protein deficient animals.Este estudio fue diseñado para determinar los efectos tóxicos del sulfato de níquel sobre el perfil bioquímico y de oligoelementos del hígado en ratas con deficiencia de proteínas.Se administró sulfato de níquel, a la dosis de 800 mg/l, en el agua de bebida de ratas Sprauge Dawley (S-D normales control y con deficiencia de proteínas, durante 8 semanas. Se estudiaron los efectos del tratamiento con níquel y de la deficiencia de proteínas, por separado y en combinación,sobre marcadores enzimáticos hepáticos de la rata como la fosfatasa alcalina (FA, la glutamato oxalacetato transaminasa (GOT, la glutamato piruvato transaminasa (GPT y también el estado de oligoelementos en el hígado de la rata. Las ratas con deficiencia de proteínas, las ratas tratadas con níquel, así cómo aquéllas con la combinación de deficiencia de proteínas y tratamiento con níquel mostraron reducciones significativas en el peso corporal y en el contenido hepático de proteína, en comparación con las ratas normales control. La actividad hepática fosfatasa alcalina y alanina aminotransferasa mostró una elevación significativa en las ratas sometidas a deficiencia de proteínas, a tratamiento con níquel, y a la combinación de deficiencia de proteínas y tratamiento con níquel. Con respecto de las concentraciones hepáticas de aspartato aminotransferasa, se observó una elevación significativa en los animales con deficiencia de proteínas y en aquellos tratado con níquel y con deficiencia de proteínas. La administración de níquel a ratas normales y con deficiencia de proteínas ha producido un aumento significativo de las concentraciones de níquel, fósforo y azufre en el tejido hepático. La concentración de cinc y cobre en el tejido hepático disminuyó significativamente los animales con deficiencia de proteínas, los tratados con níquel, y aquellos con deficiencia de prote

  14. Écriture réflexive et développement professionnel : quels indicateurs ?

    Directory of Open Access Journals (Sweden)

    Alexandre Buysse

    2011-06-01

    Full Text Available Quels indicateurs permettent d’inférer des processus d’apprentissage et/ou de développement professionnel à partir des discours (écrits des étudiants produits dans l’alternance ? Et quelles médiations – intériorisées par les étudiants – influencent ces processus ? Pour répondre à ces questions, nous envisageons le développement professionnel à partir des médiations, de la réflexivité et des régulations qui y conduisent. Nos analyses de discours s’appuient sur des textes réflexifs produits par des enseignants en formation. Elles croisent des critères relatifs à la construction des savoirs professionnels, aux niveaux de réflexivité, aux systèmes de régulation et aux genres de médiations. Nous relevons ainsi des indices de développement dans les énoncés des étudiants ainsi que des traces des médiations. Au final, les textes peuvent se catégoriser selon différents rapports entre objectivation-adaptation et subjectivation-développement : acquisition du savoir, appropriation-adaptation, internalisation et « expertise ».How can students’ written discourses serve as traces to infer their learning processes and/or their professional development processes? Which mediations internalized by the students influence this process? In order to answer these questions we consider professional development as resulting from mediations, regulations and reflexivity. Student teachers’ reflexive writings form the basis of our discourse analyses. These analyses take into account traces of professional knowledge building, of systems of regulations, of levels of reflexivity and of mediations. Eventually, these texts can be categorized according to different relations between objectivation-adaptation and subjectivization-development: acquisition of knowledge, appropriation-adaptation, “ongoing internalization” and “expertise”.

  15. Toxicity symptoms of nickel in common bean Sintomas de toxidez de níquel em feijoeiro

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    Marcela Campanharo

    2010-09-01

    Full Text Available Despite the importance of nickel (Ni in the N metabolism of legumes, common bean (Phaseolus vulgaris L. is considered very sensitive to Ni doses. The objective in this study was to characterize the toxicity symptoms of Ni in common bean cv. Pérola. The experiment was conducted in greenhouse in the campus of the Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes - RJ. Solutions containing 0; 20; 40; 60 and 100 mg L-1 of Ni, in the form of nickel chloride hexahydrate (NiCl2.6H2O, were applied to shoots of common bean plants at the rate of 2.5 mL of solution per plant of common bean, 25 days after sowing. Plants of common bean treated with 0; 20; 40 and 60 mg L-1 of Ni showed no toxicity symptoms. Plants treated with 100 mg L-1 of Ni showed chlorotic leaves with gray spots that coalesced and became necrotic in a more advanced stage.Apesar de o Ni ser importante no metabolismo do N em leguminosas, o feijoeiro comum (Phaseolus vulgaris L. é considerado bastante sensível a doses de Ni. Objetivou-se caracterizar os sintomas de fitotoxidez de Ni em feijoeiro comum cv. Pérola. O experimento foi conduzido em casa de vegetação na Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes - RJ. Foram aplicados 0; 20; 40; 60 e 100 mg L-1 de Ni (2,5 mL de solução por planta na forma de cloreto de níquel hexahidratado - NiCl2.6H2O, na parte aérea de plantas de feijoeiro comum aos 25 dias após a semeadura. Plantas de feijão tratadas com 0; 20; 40 e 60 mg L-1 de Ni não apresentaram sintomas de ftoxidez. Já as plantas que receberam a dose de 100 mg L-1 de Ni apresentaram folhas cloróticas e com manchas acinzentadas que coalesceram e se tornaram necróticas em um estádio mais avançado.

  16. Développement intégré, gestion des risques et adaptation communautaire au changement climatique dans un système montagne-plaine au nord de la Tanzanie

    Directory of Open Access Journals (Sweden)

    Ben Wisner

    2012-04-01

    Full Text Available Cet article présente une analyse préliminaire d’un travail mené le long des pentes des montagnes et dans les plaines du nord de la Tanzanie. Un fort degré d’interdépendance a pu être mis en évidence parmi des groupes d’individus de langues et de cultures différentes, de statuts socio-économiques variés. Leurs interactions se situent le long de gradients environnementaux allant de l’amont à l’aval. On désignera cela « adaptation socio-géographique » au changement climatique. Cependant, l’analyse et la discussion présentées ajoutent la complexité à n’importe quelle notion simpliste « d’adaptation au changement climatique » puisque les changements sont multiples et l’adaptation, de fait, reste complexe.

  17. L’équité au cœur des politiques climatiques : l’exemple des négociations relatives au climat et de la recherche de solutions à la crise énergétique

    Directory of Open Access Journals (Sweden)

    Loïc Aubrée

    2011-02-01

    Full Text Available L’article débat de la question de l’équité dans la lutte contre les changements climatiques. Il établit un parallèle entre le développement pris au niveau international de la négociation entre Etats d’une part, et la pauvreté au niveau d’une collectivité d’autre part. Dans les deux cas, il s’agit à la fois d’un principe moral essentiel, mais aussi d’une condition centrale des consensus et donc de la réussite des politiques face au défi climatique. La question de l’équité renvoie aussi très vite au changement nécessaire des modes de vie vers plus de sobriété.The article debates Equity Issues in the Climate Change debate is debated. A parallel is set between the development issues at the international level of negotiations between States, and poverty alleviation at the local community level. In both cases, the discussions stem from an essential moral principle, but also as a requisite for consensus and thus a condition of success of climate change policies to combat Climate Change. The issue of equity brings also forward the necessary modification of consumption patterns, into more frugal modes.

  18. Du neuf avec du vieux : la politique climatique influence-t-elle l’aide bilatérale au développement ?

    Directory of Open Access Journals (Sweden)

    Axel Michaelowa

    2011-05-01

    Full Text Available Depuis la Conférence des Nations unies sur l’environnement et le développement qui s’est tenue à Rio de Janeiro en 1992, les donateurs bilatéraux et multilatéraux affirment que l’aide au développement a été axée toujours davantage sur des interventions respectueuses du climat. Dans le cadre de l’aide relative à l’énergie, cela devrait se traduire par une intensification sensible des projets liés aux énergies renouvelables et à l’efficacité énergétique. L’examen d’une nouvelle base de données réunissant des centaines de milliers de projets bilatéraux d’aide au développement nous permet d’établir si cette réorientation a bel et bien eu lieu. Or, contrairement aux attentes, il s’avère que la part des projets financés par des fonds bilatéraux et consacrés aux énergies renouvelables et à l’efficacité énergétique n’a pas progressé entre 1980 et 2008. Cette part a fortement varié en fonction des prix du pétrole ; elle présente notamment une crête coïncidant avec le deuxième choc pétrolier du début des années 1980. L’impact des accords internationaux portant sur le climat est mineur, voire inexistant. Les énergies renouvelables « traditionnelles » telles que l’hydroélectricité et la géothermie ont fléchi alors que les « nouvelles » énergies renouvelables ont connu deux temps forts, au début des années 1980 et à la fin des années 1990. Les différences entre les pays donateurs sont énormes. Plusieurs pays, dont des « climatosceptiques » comme les Etats-Unis et l’Australie, mais aussi le Royaume-Uni et la Suisse, ont présenté un recul constant. Les pionniers autoproclamés du climat tels que l’Allemagne, les Pays-Bas, la Norvège et la Suède affichent des pics liés tant aux chocs pétroliers qu’à la politique climatique internationale. Une « nouvelle » aide au développement liée à l’atténuation du réchauffement climatique n’est pr

  19. BIOGÉOGRAPHIE DU SILURE GLANE (SILURUS GLANIS : CAUSES HYDROGRAPHIQUES, CLIMATIQUES ET ANTHROPIQUES. BIOGEOGRAPHY OF THE SHEATFISH (SILURUS GLANIS : HYDROGRAPHICAL, CLIMATIC AND ANTHROPIC CAUSES.

    Directory of Open Access Journals (Sweden)

    SCHLUMBERGER O.

    2008-05-01

    Full Text Available La répartition actuelle du silure glane (Silurus glanis en France et en Europe résulte de la combinaison de facteurs à la fois hydrographiques, climatiques et anthropiques. Des données paléontologiques montrent que l'espèce faisait partie de l'ichtyofaune française (bassin du Rhône avant d'être éliminée par les glaciations. Le réchauffement climatique qui a suivi (10 000 av. JC et l'existence d'interconnexions entre, d'une part, des tributaires de la mer Noire et de la mer Caspienne et d'autre part ceux de la mer Baltique et de la mer du Nord lui ont permis de rapidement coloniser le Nord de l'Europe occidentale. Deux périodes de transplantations-introductions de l'espèce, à but économique, sont identifiées. Une première vague d'introductions hors du bassin danubien semble avoir eu lieu dès le Moyen-Age (lacs de Suisse, suivie par une deuxième période débutant vers 1800, et se poursuivant actuellement. Les effets combinés de ces introductions et des dégradations du milieu d'origine anthropique ont induit un décalage de l'aire de distribution vers le Sud et le Sud-Est de l'Europe (Italie, Espagne, tandis que ne subsistent en Suède, Carélie, Russie et Estonie que des populations relictuelles. Les résultats présentés ici, pourraient aussi concerner d'autres espèces de poissons (Percidés, Cyprinidés, qui, après avoir bénéficié pendant les glaciations des refuges constitués par les bassins de la mer Noire et de la mer Caspienne, ont pu (re- colonisé l'Europe continentale, de manière « naturelle » et avec l'aide de l'Homme. The biogeography of the sheatfish (Silurus glanis results from the combined impacts of hydrogeography, climate and man. Paleontological evidences prove that the species was present in France (Rhône river before the glaciations. The improvement of the climatic conditions (from 10 000 JC and hydrographical interconnexions between tributaries of the Black and Caspian Sea basins, and between

  20. Les scénarios globaux de changement climatique et leurs incertitudesGlobal scenarios of climate change and associated uncertainties

    Science.gov (United States)

    Le Treut, Hervé

    2003-06-01

    The changes in the atmospheric chemical composition since the beginning of the industrial era have no equivalent throughout the Quaternary. All model simulations indicate that, without a significant decrease of the greenhouse gases emissions, climate is bound to change importantly during the years and decades to come. The precise forecast of these changes is made difficult both by the characteristics of natural systems which are not entirely predictable - as well as by our present and future socio-economic choices. To cite this article: H. Le Treut, C. R. Geoscience 335 (2003).

  1. Oxidação de sulfetos de níquel com microorganismos mesófilos Nickel sulphide oxidation by mesophile bacteria

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    Luciano Rodrigo Gomes Santos

    2008-03-01

    Full Text Available A oxidação de sulfetos metálicos tem sido associada à drenagem ácida de mina, um dos maiores problemas ambientais na mineração. Uma das formas de se acelerar a oxidação desses sulfetos é a biolixivação, na qual o crescimento desses microorganismos é favorecido. Foi estudada, nesse trabalho, a oxidação de um concentrado sulfetado complexo de pentlandita/pirrotita utilizando bactérias mesófilas. Foram avaliados os efeitos do pH e do percentual de sólidos sobre a extração do níquel. Os resultados indicaram que a biolixiviação pode ser uma alternativa viável ao processamento de sulfetos complexos de ferro e de níquel, uma vez que foram obtidos percentuais de extração acima de 60%. O pH possui pequena influência nos percentuais de extração obtidos, sendo o valor ideal igual a 2,0. Sua influência parece estar ligada, principalmente, à regulação da atividade bacteriana. Percentuais de sólidos elevados (aproximadamente de 10% podem ser praticados, sem apresentarem diferenças significativas na extração final de níquel, pois a transferência gasosa no sistema é pouco comprometida. Dessa forma, o fator limitante da atividade bacteriana, em percentuais elevados de sólidos, é a disponibilidade de dióxido de carbono.Metallic sulphide oxidation has been associated to the generation of acid mine drainage, one of the most import environmental issues in the mining industry. Bioleaching can be applied to accelerate sulphide oxidation, ceasing these impacts. This work sought to study the biooxidation of a complex nickel-iron sulphide (pentlandite and pyrrhotite using acidophile iron-oxidizing bacteria. The effects of pH and solids concentration on the extraction of nickel were evaluated. A high nickel extraction (around 60% can be achieved confirming the feasibility of nickel sulphide bioleaching. The pH has a negligible effect on nickel extraction being pH 2.0 the best value. Nickel dissolution can be achieved at high

  2. ESMECTITA PILARIZADA CON Al-Ce, MODIFICADA CON ÓXIDO DE POLIETILENO. EMPLEO COMO SOPORTE CATALÍTICO PARA EL NÍQUEL

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    Carlos Enrique Daza

    2010-03-01

    Full Text Available Se modificó una esmectita natural con soluciones mixtas de Al-Ce en presencia de un tensoactivo de tipo no iónico (óxido de polietileno. La intercalación se llevó a cabo asistida por ultrasonido para favorecer la homogenización de la mezcla y la difusión de especies hacia la interlámina del mineral. Se estudió el efecto de la relación tensoactivo-arcilla y la potencialidad de estos materiales como soportes catalíticos para el níquel. Los análisis termogravimétricos indicaron que la descomposición del tensoactivo se da a 500 ºC. Los espectros DRIFT y DRX sugieren que la incorporación del tensoactivo se presenta en la superficie externa del mineral, el cual fue pilarizado. El aumento en la cantidad de tensoactivo causó pérdida de cristalinidad del material. La presencia del tensoactivo induce la formación de mesoporos. Los TPR-H2 indicaron que la modificación en presencia del tensoactivo favorece la reducibilidad del Fe del mineral. Se identificaron diferentes especies reducibles de Ni sobre la superficie del soporte, evidenciándose un aumento en la interacción níquel-soporte y en la reducibilidad a 700 ºC con H2 puro para los catalizadores obtenidos a partir de los materiales modificados con tensoactivo. Se obtuvieron catalizadores con buena distribución del níquel en la superficie, tamaños de cristalitos menores de 10 nm y estabilidad térmica limitada. Los catalizadores modificados con tensoactivos soportados sobre arcillas presentaron mejores actividades catalíticas en el reformado de metano con CO2 a 700 ºC (WHSV=60 Lg-1h-1 con menores niveles de formación de coque.

  3. Utilidad de la conformación del túnel liso antes de usar limas rotatorias endodónticas de níquel-titanio

    Directory of Open Access Journals (Sweden)

    Javier Laureano Nino Barrera

    Full Text Available Introducción: para prevenir la fractura de instrumentos endodonticos actualmente se siguen investigando materiales, técnicas y diseños los cuales buscan reducir su incidencia. La conformación de túnel liso (Glide Path se ha propuesto con este fin, sin embargo su utilidad ha sido controvertida. Objetivo: comprobar teóricamente mediante la utilización de un análisis de elementos finitos, la utilidad de la conformación de túnel liso, antes de la utilización de limas rotatorias endodonticas de níquel-titanio. Métodos: se realizó una simulación numérica mediante un análisis de elementos finitos, para lo cual se construyeron modelos matemáticos de las limas rotatorias de níquel-titanio S1 y S2 de la serie Protaper®. Con el software Simulation multyphisics de Autodesk® se programaron las propiedades mecánicas de las limas y un límite de falla por fractura de 1270,588 MPa. Posteriormente se aplicó el torque recomendado por el fabricante y se fijo la punta del instrumento (sin conformación de túnel liso aplicando allí restricciones en todos los grados de libertad.Para simular la realización de la conformación de túnel liso, se aplicaron restricciones en todos los grados de libertad a una determinada distancia de la punta del instrumento, simulando de esta forma que la punta del instrumento permanecía libre. Resultados: al fijar la punta de las limas, los esfuerzos máximos fueron 1545,77 MPa para la S1 y 1306,47 MPa para la S2, observando fractura de los instrumentos. Al fijar las limas a distancia de la punta no se observó fractura. Conclusiones: se demostró teóricamente que al impedir que se atrapen la punta de las limas, se previene su fractura y que dicho atrapamiento se evita con una conformación de túnel liso, por lo que se concluye que este procedimiento es útil para prevenir la fractura de los instrumentos rotatorios de níquel-titanio.

  4. APLICACIÓN DE LA PLANEACIÓN ESTRATÉGICA EN EL CENTRO DE INVESTIGACIONES DEL NÍQUEL

    Directory of Open Access Journals (Sweden)

    Ester Rodríguez Castillo

    2010-12-01

    Full Text Available La investigación se realiza en el Centro de Investigaciones del Níquel, con el objetivo de diseñar la Planeación Estratégica de la empresa y así mejorar su desempeño. Para alcanzar el objetivo, se utilizaron métodos teóricos de investigación científica: análisis y síntesis, hipotético-deductivo, histórico-lógico; así como algunos de los métodos empíricos de investigación: observación directa, entrevistas, tormenta de ideas, encuestas, consulta y revisión de documentos, trabajo en grupos, entre otros. Para procesar toda la información obtenida se empleó el paquete de programas de Office y otros software.Entre los principales resultados alcanzados se encuentran la definición de una nueva misión y visión del centro, involucrando a los trabajadores en el proceso de toma de decisiones; la definición de los objetivos estratégicos y las estrategias a seguir para alcanzarlos; así como la elaboración del plan de acción, cuya ejecución ha permitido desde el 2007 a la fecha actual, el incremento de las ventas en un 23 % con la realización de 60 nuevos servicios científico-tecnológicos, la disminución del consumo de energía eléctrica en 180 MW, el aumento de la productividad en más de 3000 pesos, y el logro de la ejecución de inversiones por 594 miles de pesos, que significan un mejoramiento considerable en las condiciones de trabajo del centro.AbstractThe investigation is carried out in the Nickel research Center, with the objective of designing the Strategic Projection of the company in order to improve its performance. To reach the objective, theoretical methods of scientific investigation were used, such as: the analysis-synthesis method, deductive-hypothetical, logical-historical method; as well as some of the empiric methods of investigation: direct observation, interviews, brainstorming, surveys, the consult and revision of documents, team group, among others. To process all the obtained information it was

  5. « L’Amazonie – victime des changements climatiques ? » « The Amazon forest – victim of climate change? » « A Amazônia – vítima das mudanças climáticas ? »

    Directory of Open Access Journals (Sweden)

    Delaine Sampaio da Silva

    2010-12-01

    Full Text Available La forêt d’Amazonie est un des biomes les plus riches et les plus importants de la Terre. Cependant, son avenir est gravement menacé par les changements climatiques. L’effet de ces changements est indissociable de celui des activités humaines. Ainsi, la déforestation est responsable de plus de la moitié des émissions de gaz à effet de serre du Brésil. La lutte contre les changements climatique au Brésil passe donc en premier lieu par la lutte contre la déforestation. Cette lutte fait face aux enjeux actuels du développement en Amazonie, en premier lieu l’élevage et l’agriculture à grande échelle. Certains éléments des politiques récentes du Brésil vont dans le sens d’un développement moins « sauvage » en Amazonie, mais se heurtent à des intérêts économiques et politiques. Les initiatives internationales comme Reduced Emissions from Deforestation and forest Degradation (REDD, dans le cadre d’un accord climatique, peuvent fournir des incitatifs économiques cruciaux. Il est dans tous les cas primordial qu’un tel développement soit adapté à la réalité amazonienne et se fasse en collaboration avec les populations locales dans une optique de développement social autant qu’écologique ou économique.The Amazon rainforest is one of most important ecosystems on earth and a biodiversity hotspot. Its future is however in peril due to the effects of climate change and human activities. Climate models predict a severe die-back of the Amazon forest by the end of this century, accompanied by the release of vast quantities of carbon actually stored in the vegetation. Deforestation is currently responsible for over one half of Brazil’s greenhouse gas emissions. Fighting deforestation is therefore Brazil’s most efficient way to reduce its emissions. This is however contrary to current development schemes in the Amazon region, and in particular large scale agricultural and cattle raising farms. However, Brazil

  6. Procedimiento para estimar el extractable del níquel con una red neuronal artificial, en sustitución de los modelos estadísticos tradicionales

    Directory of Open Access Journals (Sweden)

    Francisco Viada Aguilera

    2010-01-01

    Full Text Available Las Redes Neuronales Artificiales se aplican en la estimación o predicción de los sistemas de detección de fallas de equipos, logrando con ellas las mismas funciones que el modelo estadístico tradicional. Se argumentó un método para sustituir los algoritmos de selección y el conjunto de modelos que normalmente se utilizan en sistemas de control predictivo de procesos complejos, los que están determinados por un conjunto de variables, con un amplio rango de variación de cada una de ellas, como es el caso del extractable del níquel obtenido en los hornos de reducción de la fábrica, por una Red Neuronal.

  7. Precipitación de los sulfuros de níquel y cobalto a partir de soluciones carbonato amoniacales sintéticas

    Directory of Open Access Journals (Sweden)

    Miguel Garrido-Rodríguez

    2001-03-01

    Full Text Available Se estudió la eficiencia de la precipitación selectiva del Co a partir de soluciones carbonato amoniacales sintéticas utilizando como agentes precipitantes el hidrógeno sulfuro de amonio y el hidrógeno sulfuro de sodio. El estudio realizado permitió identificar los factores de mayor influencia en el desarrollo de las reacciones de precipitación de cobalto y de níquel, determinar los modelos estadísticos matemáticos que caracterizan las reacciones de precipitación del cobalto y comparar la eficiencia de precipitación de ambos agentes precipitantes

  8. introduction : La prise en compte du genre dans l'étude du mal être au travail : quels enjeux, quelles perspectives ?

    OpenAIRE

    Bercot, Régine

    2014-01-01

    International audience; Introduction générale La prise en compte du genre dans l'étude du mal être au travail : quels enjeux, quelles perspectives ? Régine Bercot Le titre de cet ouvrage le mal être du genre au travail reprend les termes d'un séminaire organisé en 2013. Le séminaire nous a en effet conforté dans l'hypothèse que nous formulions en début de séminaire à savoir que les sources du mal être mais aussi les situations vécues diffèrent selon que l'on est homme ou femme. Ainsi de nombr...

  9. Influência do bismuto, níquel, estanho e alumínio na espessura da camada dos revestimentos galvanizados

    OpenAIRE

    De Lima,Graziela; Guesser,W.L.; Masiero,I.

    2007-01-01

    Conexões de ferro fundido maleável preto foram galvanizadas em dezesseis diferentes banhos de zinco, cada qual composto por concentrações e combinações variadas de bismuto (0,06 e 0,1%), níquel (0,003 e 0,05%), estanho (0,3 e 0,5%) e alumínio (0,01 e 0,14%). Os revestimentos obtidos foram estudados através de medidas de espessura de camada, análise metalográfica utilizando microscopia ótica e microanálise utilizando espectrometria de energia dispersiva de raios-x (EDS). Obtiveram-se algumas v...

  10. Sistema para el almacenamiento de la información geológica en empresas del níquel

    Directory of Open Access Journals (Sweden)

    Mirelis Rasúa-López

    2000-03-01

    Full Text Available En el presente artículo se exponen las características de un sistema computarizado para el almacenamiento y consulta de la información geológica llamado PinExplorer, y realizado por encargo de la Empresa Pinares S.A. Soportado sobre Delphi 4, PinExplorer se inserta totalmente en interfaz de Windows 95 y de Windows NT, trabaja eficientemente en red, tiene un diseño normalizado de las bases de datos, y estas pueden ser importadas y exportadas de forma conveniente con la garantía de validación correspondiente. Para mayor seguridad, las bases se almacenan en formato comprimido y protegidas con contraseña. Por sus características, PinExplorer puede ser implementado en cualquiera de las empresas del níquel de nuestro país.

  11. Modelación matemática del proceso de reducción para la obtención de ferroníquel

    Directory of Open Access Journals (Sweden)

    Lianis Columbié-Navarro

    2011-03-01

    Full Text Available Se modeló matemáticamente el proceso de reducción para la obtención de ferroníquel. Partiendo de las ecuaciones de balance material y energético se expone el sistema de ecuaciones que conforman el modelo matemático dinámico y la fundamentación científica sobre la cual fueron obtenidas. Para la transformación de las ecuaciones de balance material y energético se consideraron los principales óxidos y elementos que componen el mineral, los gases de la combustión y las temperaturas del material, de las paredes del horno y de los gases reductores. Se obtuvo un sistema de ecuaciones diferenciales de primer orden, complementadas con otras ecuaciones algebraicas que establecen la relación entre los coeficientes y los parámetros físicos.

  12. Adubação foliar com níquel e molibdênio no feijoeiro comum cv. Ouro Vermelho

    Directory of Open Access Journals (Sweden)

    José Francisco Lopes

    2014-04-01

    Full Text Available O objetivo deste trabalho foi avaliar o efeito da aplicação foliar de níquel (Ni e molibdênio (Mo sobre componentes de rendimento, crescimento e composição mineral do feijoeiro comum Ouro Vermelho. O delineamento experimental foi o de blocos casualizados, com quatro repetições e arranjo fatorial 5 x 2, constituído de doses de Ni (0, 15, 30, 45 e 60 g ha-1 e de Mo (0 e 80 g ha-1, aplicadas por via foliar, aos 25 dias após a semeadura, na forma de cloreto de níquel hexaidratado e de molibdato de amônio, respectivamente. As doses de Ni não influenciaram os teores foliares de N, P, K, Fe, Mo e Ni, aumentaram, porém, os teores de N, Ni e de proteína bruta na semente. A aplicação foliar de Mo reduziu os teores foliares de P, Fe e Ni, aumentou, no entanto, o teor foliar de Mo e o teor de N, Mo e de proteína bruta na semente. Observou-se que as doses de Ni e de Mo não afetaram a massa de sementes, o número de sementes por vagem, o número de vagens por planta e a massa seca de raiz do feijoeiro. A aplicação de Mo aumentou em 21,62% o número de nódulos.

  13. Contact sensitivity to metals (chromium, cobalt and nickel in childhood Alergia de contato aos metais (cromo, cobalto e níquel na infância

    Directory of Open Access Journals (Sweden)

    Marilda Helena Toledo Brandão

    2012-04-01

    Full Text Available Metals, especially nickel, are the most common contact allergens in children. Recent data has shown increased incidence of allergy in industrialized countries. Sensitization can occur at any age, even in neonates. Costume jewelry, particularly earrings, is linked to increased sensitization to nickel. Sensitization to cobalt often occurs by the use of costume jewelry. The most common source of sensitization to chromium is leather. Due to the absence of a specific therapy, the main treatment is to identify and avoid the responsible allergens. This article presents an updated view on the epidemiological and clinical aspects of contact allergy to metals, focusing on prevention strategies and risk factors, and warns about possible and new sources of contact.Os metais, especialmente o níquel, são os sensibilizantes de contato mais comuns em crianças. Dados recentes revelam aumento na incidência da alergia deste em países industrializados. A sensibilização pode ocorrer em qualquer idade, mesmo em recém-nascidos. Bijuterias, especialmente brincos nas orelhas, são ligadas ao aumento da sensibilização ao níquel. A sensibilização ao cobalto geralmente ocorre pelo uso de bijuterias. A fonte mais comum de sensibilização ao cromo é o couro. Devido à ausência de terapia específica, o principal tratamento consiste em identificar e evitar os alérgenos responsáveis. Este artigo pretende apresentar uma visão atualizada sobre os aspectos epidemiológicos e clínicos da alergia de contato aos metais, focando estratégias de prevenção e fatores de risco, além de alertar sobre as possíveis e novas fontes de contato.

  14. Efeito do níquel e da concentração protéica sobre o consumo e digestibilidade aparente da materia seca, proteína bruta, energia e balanço de nitrogênio do feno de Brachiaria brizantha cv. Marandu em ovinos

    OpenAIRE

    O.J. Paula; Graça,D.S.; Vasquez,E.A.; Martins,R.G.R.

    2005-01-01

    Avaliaram-se os efeitos do níquel e da concentração protéica da dieta sobre o consumo e a digestibilidade aparente da matéria seca (MS), proteína bruta (PB) e energia, e balanço de nitrogênio do feno de Brachiaria brizantha cv. Marandu, oferecido a ovinos. As dietas testadas foram: A- feno; B- feno + níquel; C- feno + mistura protéica; D- feno + níquel + mistura protéica. As dietas continham, respectivamente 0,2, 5,2, 0,5 e 5,5ppm de níquel e 3,1, 3,1, 8,2 e 8,2% de PB. Nos níveis com menor c...

  15. La variabilité climatique et son impact sur les ressources en eau dans le degré carré de Grand-Lahou (Sud-Ouest de la Côte d'Ivoire

    Directory of Open Access Journals (Sweden)

    Tanina Drissa Soro

    2011-02-01

    Full Text Available Cette étude vise à montrer l'existence d'une variabilité climatique au niveau de la région de Grand-Lahou et à comprendre son impact sur l'alimentation des ressources en eau. Pour ce faire, diverses données et méthodes (indices centrés réduits, test de PETTIT, méthode bayésienne de LEE et HEGHINIAN ont été utilisées.L'application des indices centrés réduits aux séries pluviométriques et hydrologiques a mis en évidence une variabilité climatique caractérisée par une alternance de phases humides, normales et sèches. Les méthodes statistiques indiquent des ruptures entre 1966 et 1981, qui marquent une modification des régimes pluviométrique et hydrologique. Ces ruptures s'accompagnent d'une diminution de la pluviométrie de 13 à 28 % et de l'écoulement du Bandama de 58 %. Les manifestations de cette variabilité climatique se répercutent sur les ressources en eau souterraine. Ainsi les résultats du bilan hydrique montrent une baisse de la recharge des nappes souterraines.This study aims to show the existence of a climatic variability to the level of the region of Grand-Lahou and to understand its impact on the food of water resource. For that to make, various data and methods have been used (reduced centered indexes, PETTIT test, LEE and HEGHINIAN method.The application of the reduced centered indexes to the sets rainfall and runoff times series put in evidence a climatic variability characterized by an alternation of humid, normal and dry phases. The statistical methods show some breaks between 1966 and 1981 that mark a modification of the rainfall and runoff regimes. These breaks are accompanied by a rainfall decrease of 13 to 28 % and a flow decrease of 58 % for the river Bandama. This variability induces some effects on groundwater. Thus, water balance results show the decrease of groundwater recharge.

  16. Facing the climatic threat, the nuclear illusion; Face a la menace climatique, l'illusion du nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-01

    In the framework of the energy problem, the network Action Climate brings many propositions to explain that the nuclear is not a solution to the global warming. A boost to the nuclear will be done to the detriment of cheaper, safer and more adapted policies, as the energy conservation and efficiency, the energy production decentralization and the renewable energies development. The three parts shows how the nuclear cannot answer to the climatic problem, the nuclear refutes the Rio declaration on the environment and the sustainable development, the nuclear is a french specificity which damages the national policy against the climatic change. (A.L.B.)

  17. Climate Change Impacts in the sub-Antarctic Islands Technical Report N.2 of ONERC; Impacts du changement climatique dans les iles subantarctiques. Rapport Technique N.2 de l'ONERC

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2009-07-01

    Difficult to apprehend as a whole, the polar regions constitute the Arctic to the North, an ocean surrounded by emerged lands, and the Antarctic to the South, a continent bordered by the Austral Ocean where a belt of sub Antarctic islands lies. Climate change impacts on sub Antarctic islands are varied, direct and indirect: glacier retreat, more favourable conditions for introduced species, marine biodiversity modification, etc. This report discusses the French, British, Australian, South African and New Zealand sub Antarctic islands, the climatic evolutions and the resulting impacts, focused especially on biodiversity. The Observatoire National sur les Effets du Rechauffement Climatique and the International Polar Foundation have been joined in this endeavour by the French polar institute Paul-Emile Victor, the administration of the French Southern and Antarctic Lands (TAAF in French) and the International Union for the Conservation of Nature. (authors)

  18. Vulnérabilités et résilience au changement climatique en milieu urbain : vers de nouvelles stratégies de développement urbain durable ?

    OpenAIRE

    Quenault, Béatrice; Pigeon, Patrick; Bertrand, François; Blond, Nadège

    2011-01-01

    La littérature académique comme institutionnelle en matière de risques urbains a connu de substantiels développements au cours des dernières décennies, avec un changement progressif du regard porté sur la question des catastrophes « naturelles », notamment à la lumière du changement climatique. Ce phénomène simultanément planétaire, irréversible, et anthropogénique, qui multipliera et accentuera très vraisemblablement les événements catastrophiques d’origine météorologique tout autour de la p...

  19. Disponibilidade de níquel em solo tratado com lodo de esgoto e cultivado com sorgo Availability of nickel in soil treated with sewage sludge and cultivated with sorghum

    Directory of Open Access Journals (Sweden)

    Marcos Donizeti Revoredo

    2006-01-01

    Full Text Available A presença do metal pesado níquel no lodo de esgoto pode se constituir em entrave para sua aplicação em solos agrícolas. Nesse contexto, o presente trabalho teve como objetivo avaliar o efeito da aplicação do lodo de esgoto contaminado com doses crescentes de níquel, em um solo, sobre a disponibilidade e a absorção desse metal pelas plantas de sorgo. O experimento foi desenvolvido em casa de vegetação, em vasos, usando Latossolo Vermelho distrófico. As amostras de solo foram coletadas aos 0 e 128 dias após a instalação do experimento. O delineamento utilizado foi o inteiramente casualizado, com cinco tratamentos (4 doses de níquel no lodo de esgoto e 1 tratamento testemunha, sem adição de lodo de esgoto e com fertilização mineral em quatro repetições. A aplicação de lodo de esgoto contaminado com doses crescentes de níquel resultou em aumentos proporcionais nos teores "total" e disponíveis de níquel no solo. Os extratores Mehlich-1 e Mehlich-3 extraíram os maiores teores de níquel do solo. O Mehlich-3 foi o extrator que obteve a maior correlação com as quantidades de níquel presentes nas plantas de sorgo. A partir do aumento dos teores de níquel no solo, ocorreu também aumento na absorção desse metal pesado, de 39,93; 101,16; 152,58 e 171,38 %, pelas plantas de sorgo.The presence of the heavy metal nickel in plants growing in soils treated with sewage sludge can be a restraining factor for using this waste in agriculture. The aim of this paper was to evaluate nickel availability and absorption by sorghum plants in soil treated with sewage sludge contaminated with increasing doses of nickel. The experiment was carried out in a greenhouse, in pots, using samples of a Typic Haplustox. Soil samples were collected 0 and 128 days after the experiment was established. The statistical design adopted was completely randomized, with five treatments (four doses of nickel in the sewage sludge and one control without

  20. Determinación de las estructuras tubulares presentes en el Pit6 en el depósito laterítico de níquel de Cerro Matoso

    OpenAIRE

    Castrillón Peña, Andrés

    2012-01-01

    Una sucesión de rocas con fósiles de organismos bentónicos en el depósito laterítico de níquel de Cerro Matoso S.A. (CMSA), localizadas en el extremo nororiental del cuerpo ultramáfico Denominado en proceso minero Pit6 a la altura del Banco 42, fueron estudiadas y analizadas Con petrografía, XRD, XRF y SEM. Estas rocas permiten precisar la génesis del yacimiento más importante de níquel en el país actualmente. La sucesión de rocas calcáreas autigénicas fosilíferas y depósitos ...

  1. AGARICUS BITORQUIS (QUEL.) SACCARDO’ İN MİSEL GELİŞİMİ VE YETİŞTİRİLMESİNE PROPOLİSİN ETKİLERİ

    OpenAIRE

    GÜLER, Perihan; Çelemli, Ömür Gençay; SORKUN, KADRİYE

    2011-01-01

    In this study, the effects of bee product propolis onto the Agaricus bitorquis (Quel.) Saccardo which is known as summer mushroom that is resistant to high temperature were studied. Propolis, honey bees and the trees by the bark, buds and buds of plants collected, is a very strong sticky substance that has anti-viral, anti-bacterial, anti-fungal effect. It has very rich aliphatic acid, amino acid, and aromatic acid, esters of aromatic acids, aromatic aldehyde, flavones, ketone and terpenoids ...

  2. Identificación y caracterización funcional de sistemas génicos implicados en la homeostasis de níquel en Rhizobium leguminosarum bv. viciae

    OpenAIRE

    2010-01-01

    La homeostasis de metales como níquel, cobalto, cobre o zinc es un proceso delicado en procariotas. Estos metales de transición son, por un lado imprescindibles para el mantenimiento del metabolismo celular, pero por otro muy tóxicos a elevadas concentraciones. Por este motivo, los microorganismos han desarrollado mecanismos para regular su concentración intracelular, tales como bombas de flujo de metales, secuestradores intra y extracelulares o enzimas detoxificadoras.

  3. Strategies of petroleum companies facing climate change issues; Strategies des compagnies petrolieres face a la problematique du changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Gervais, St.

    2005-05-01

    The oil industry is particularly concerned with the issue of climate change. The implementation of Greenhouse Gases (GHG) reduction policies can be perceived as an additional environmental constraint for the management of the production chain. It is also represents a first step towards a possible decarbonization of the economy. In the long-term, the fight against global warming calls thus into question the activity level of petroleum companies. Confronted with this, still uncertain, new environmental deal, some petroleum multinationals adopt proactive behaviors, e.g. with voluntary commitments to reduce GHG emissions, or with investments in alternative technologies. First of all, we present the potential economic impacts of the Kyoto Protocol on oil industry. Then, we conduct a comparative analysis of the 'Kyoto risk' for the five largest multinationals of this sector according to their activities and their geographical implantations. Then, for the purpose to interpreting proactive strategies of firms such as BP and Shell, we examine various explanations including 'win-win', public image and the response to broad societal needs. This leads us to formalize the proactive behavior as an anticipatory management of carbon contestability, particularly perceptible in financial markets. Lastly, we try to justify economically investments of companies in the field of alternative energy sources and technologies through the lens of real options theory and by a management of the exhaustible fossil resources. (author)

  4. Effects of climate change on US agriculture; Les effets du changement climatique sur l'agriculture americaine

    Energy Technology Data Exchange (ETDEWEB)

    Guillet, L

    2007-08-15

    The USA are a major producer of food and fiber products in the world. The US agriculture represents more than 25% of the world trades of wheat, corn, soy and cotton. The cultivated surfaces and the pasture lands represent 210 million Ha (17% of the US territory) and 300 million Ha (26% of the US territory), respectively. The agricultural production represents less than 2% of the US GDP, put the agriculture products make about 5% of the US exports. The climate change may have some impacts on the overall agriculture industry, from the plant growth to the conditions of competition on international markets. In 2001, the US global change research program, published an evaluation report about the potential consequences of the climate change on the US agriculture. The conclusions of the panel of experts, based on climate, cultivation and economical models, was that the CO{sub 2} levels and climate changes of the 21. century would have no negative impact on the US agriculture. The average effects, on the contrary, would be rather positive, depending on the type of culture and on the region considered. Today, the experts have entertained lot of doubts about the 2001 forecasts: the fertilizing effect of CO{sub 2} is more and more criticized and an efficient supply of water appears as seriously compromised for many regions. Experts stress also on the lack of consideration for extreme climatic events, and for crop vermin and diseases. This document reanalyzes the conclusions of the 2001 report in the light of the works carried out more recently at the Agriculture Research Service (ARS). The proceedings of expert's interviews are attached in appendixes. (J.S.)

  5. REMOCIÓN DE NÍQUEL PRESENTE EN AGUAS EFLUENTES INDUSTRIALES MEDIANTE UTILIZACIÓN DE SUSTRATOS DE ASERRÍN DE PINO

    Directory of Open Access Journals (Sweden)

    Paola Rúa

    2008-04-01

    Full Text Available Se evaluaron dos variedades de aserrín de pino (Pinus cupresus, Pinus caribeae para la remoción de Ni2+ presente en efluentes industriales. Un estudio comparativo a través de operaciones batch permitió establecer la influencia de la concentración inicial del metal, la relación adsorbente a efluente y la velocidad de agitación en el proceso de remoción. La variedad Pinus cupresus arrojó la mayor adsorción, 0,53 mgNi/g, y esto, sumado a su fácil adquisición y bajo costo, lo hacen un adsorbente con gran potencial. Se ajustó un modelo cinético para la adsorción del metal y de modo paralelo se demostró que el fenómeno se da principalmente por intercambio iónico con Ca2+ y Mg2+ presentes en el aserrín. La torta húmeda residual puede disponerse por incineración ya que aproximadamente el 44% del níquel queda depositado en las cenizas. Finalmente se implementó una columna de adsorción piloto y se alcanzó una eficiencia de remoción del 57%.

  6. Parámetros y factores asociados a la dilución interna en yacimientos cubanos de níquel y cobalto

    Directory of Open Access Journals (Sweden)

    Lázaro Fernández-Martínez

    2015-12-01

    Full Text Available El propósito de este trabajo fue establecer, en los yacimientos cubanos de níquel y cobalto, los elementos que condicionan e identifican las intercalaciones de baja ley, generadoras de dilución interna, para su posterior separación durante el laboreo minero. La observación y la interpretación de datos geológicos y geoquímicos de pozos y frentes de explotación permitieron diferenciar, según su naturaleza geológica o minera, los distintos elementos que engloban los parámetros y factores vinculados con la dilución interna. Son los parámetros y factores geoquímicos del componente geológico los que mejor caracterizan las intercalaciones a partir de muestras de perforación, mientras que el control de campo es, dentro del componente minero, el que mejor permite identificar (y separar las intercalaciones inmediatamente antes del ingreso de las menas al proceso industrial, en virtud del potencial selectivo de la tecnología minera y de los equipos de arranque actuales.

  7. Investigación cinética del carbonato básico de níquel industrial purificado

    Directory of Open Access Journals (Sweden)

    Julio C. Llópiz-Yurel

    2005-03-01

    Full Text Available Se muestran los resultados de la utilización de la técnica de Análisis Térmico Diferencial (ATD, en la investigación cinética no isotérmica de la descomposición térmica del carbonato básico de níquel industrial purificado (libre de sulfatos, en el intervalo de temperaturas de 513-633 K, que exceptúa el agua de hidratación eliminada a temperaturas inferiores en la descomposición térmica de esta sustancia. En este trabajo se centra la atención en la posibilidad de la utilización de la ecuación generalizada de Kissinger y la aplicación del método de Kissinger para la determinación de parámetros cinéticos y las limitaciones de estos métodos. También se determina el modelo cinético para esta etapa de la transformación y se efectúan comparaciones entre los resultados obtenidos y otros reportados anteriormente por los autores

  8. Obtención de metalizados de hierro a partir de los residuos sólidos de la industria del níquel en Nicaro, Cuba

    Directory of Open Access Journals (Sweden)

    Yosvany Ferreiro-Guerrero

    2012-04-01

    Full Text Available El propósito de la investigación fue obtener un material con características siderúrgicas a partir de los residuos sólidos industriales de la empresa del níquel Comandante René Ramos Latour. Para ello fueron sometidos a un proceso de concentración magnética y aglomeración mediante la peletización, empleando como aglutinante la bentonita. Los pelets obtenidos de 14 y 18 mm de diámetro resistieron a la compresión en verde 9,71 y 6,98 kg respectivamente. Se demuestra que realizando las pruebas de reducción a la temperatura del horno de 1 265 ºC y enfriando con atmósfera inerte se logra obtener 76 % de metalización, así como un grado de reducción de 80,42 %

  9. El níquel y su vínculo con el agrandamiento gingival: revisión de la literatura

    Directory of Open Access Journals (Sweden)

    V. Gómez Arcila

    2014-08-01

    Full Text Available El agrandamiento gingival es común entre los pacientes y puede ser causado por una variedad de factores etiológicos. La razón más común es la inflamación gingival provocada por mala higiene oral y alta carga bacteriana. Otros factores implicados son los medicamentos sistémicos, en donde se encuentran bloqueadores de los canales de calcio, inmunosupresores y anticonvulsivantes. Algunos crecimientos gingivales podrían estar asociados a condiciones hormonales como la pubertad, el embarazo o la diabetes o ser un síntoma de una enfermedad sistémica y en raras ocasiones el agrandamiento gingival se asocia a factores genéticos y hereditario llamado fibromatosis gingival. Otra causa del agrandamiento gingival se viene presentando en la consulta odontológica y es la relacionada con la aparatología ortodóncica fija, cuya causa específica no está totalmente definida aún. El presente artículo es una revisión narrativa cuyo objetivo es describir las generalidades del agrandamiento gingival y reportes en la literatura sobre la acción de la aparatología ortodóncica fija en el agrandamiento gingival, pues se presume del níquel como otro factor causal de esta patología.

  10. Fabricación de una superaleación de base níquel con estructura celular y microporosidad interconectada

    Directory of Open Access Journals (Sweden)

    Bernabé, A.

    1998-05-01

    Full Text Available A cellular metallic material with interconnected porosity of controlled size of an order of 10 μm has been developed by electrochemical dissolution of tungsten grains in a W-Ni-Fe heavy alloy. The nickel superalloy with sponge structure and high surface/volume ratio can also be processed recycling chips from heavy metal machining (Patent n° P9700191, 1997. Applications for the new material could be found as support for catalysts, high temperature filters for corrosive fluids, burners, etc.

    En este artículo se describe la preparación y caracterización de una superaleación de base níquel de microporosidad controlada, partiendo de una aleación pesada W-Ni-Fe de naturaleza densa y con métodos electrolíticos. Se ha conseguido un proceso factible de fabricación y, simultáneamente, una oportunidad de reciclado de las virutas de mecanizado de metal pesado. Tanto el nuevo material como el proceso de obtención han sido objeto de patente (Núm. P9700191, 1997. El nuevo material podría ser interesante como soporte de catalizadores, filtro de fluidos corrosivos a temperaturas elevadas, difusor en quemadores, etc.

  11. HIERRO ELEMENTAL PARA REMOCIÓN DE NÍQUEL, COMÚNMENTE ENCONTRADO EN DRENAJE ÁCIDO DE MINAS

    Directory of Open Access Journals (Sweden)

    Maria A. Liendo

    2011-01-01

    Full Text Available El objetivo de este estudio fue evaluar la remoción del Ni2+ con partículas de hierro comercial, pues este catión se encuentra frecuentemente en los drenajes ácidos de minas (DAM, que es uno de los problemas ambientales más serios en la industria minera que afecta fuentes de aguas naturales. Fueron realizados ensayos en laboratorio con hierro comercial y soluciones sintéticas que contienen Ni2+, para observar tanto la cinética de remoción como los datos de equilibrio. Los resultados, mostraron que estos siguen el modelo de la isoterma de adsorción de Langmuir y que los datos cinéticos se ajustaron con la ecuación del modelo de adsorción de pseudo segundo orden. Se concluye del presente estudio que la remoción de níquel con hierro en estado elemental (HEE es posible y ocurre de manera rápida.

  12. Degradation of Pleurotus ostreatus (Jeca ex Fr.) Quel.Strain to Straw%平菇菌株对稻草生物降解的能力

    Institute of Scientific and Technical Information of China (English)

    宋瑞清; 杨谦; 邓勋

    2004-01-01

    选用稻草作为主要原料配制培养基,接种平菇(Pleurotus ostreatus(Jeca ex Fr.) Quel. )菌株,测试平菇菌株生长对稻草木质素及纤维素的降解率.通过对接种平菇菌株30d后的稻草与对照稻草组分分析,结果表明,接种平菇菌株的稻草木质素降解率为23.36%,纤维素降解率为16.04%,蛋白质含量增加了45.85%.平菇菌株对稻草的木质素及纤维素具有分解能力.蛋白质含量增加表明了稻草转换成饲料的可能性.

  13. Climate change and employment. A case study of Finland; Changement climatique et emploi. Cas de la Finlande

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-15

    The study has been carried out by a consortium led by the European Trade Union Confederation (ETUC) and the Social Development Agency (SDA), which includes Syndex, the Wuppertal Institute and ISTAS. It was commissioned by the European Commission, DG environment, as a contribution to improve current understanding of the relationship between climate change and employment. The study was also supported financially by seven public bodies: Ministries of Environment of Belgium, Spain, Finland, Italy, United-Kingdom; ADEME and DIAC in France. The first part of the study examines the potential consequences for employment of global warming in Europe - which has already begun and will continue. The main finding is that even moderate climate change will affect economic activity and employment in Europe, with some regions and economic sectors being particularly vulnerable. Increased warming will be likely to have very damaging consequences. The second half of the report considers the challenge for employment of the transition towards a lower CO2 European economy at the horizon 2030, in four key economic sectors: energy production, transport, steel and cement industries, construction/housing. The study considers a number of scenario for a reduction of 40% in CO2 emissions by the year 2030 and what the effects can be on European employment and skills. Case studies of eleven European countries are also analysed. This report is about Finland. [French] La Finlande est le 5e pays europeen en superficie, avec un total de 338.145 km{sup 2}, pour une population de 5,2 millions d'habitants. Le climat finlandais est le plus froid d'Europe, avec des besoins en chauffage pratiquement toute l'annee et des besoins en eclairage tres importants les mois d'hiver, en raison de la duree tres courte du jour. L'industrie est dominee par l'exploitation forestiere et le papier, ainsi que la metallurgie et la chimie, ces industries etant hautement energie-intensives. Ces

  14. Tratamento de efluentes de eletrodeposição de níquel por fotoeletrooxidação Photoelectrooxidation for nickel electroplating effluent treatment

    Directory of Open Access Journals (Sweden)

    Tatiane Benvenuti

    2012-09-01

    Full Text Available Considerando-se a preocupação crescente com a toxicidade dos efluentes, pela presença de metais e a ocorrência de novos poluentes orgânicos, esse estudo aplicou o Processo Oxidativo Avançado (POA de fotoeletrooxidação (FEO como polimento para o efluente após o processo convencional de tratamento de efluentes da indústria metalomecânica, que, muitas vezes, não remove, satisfatoriamente, metais e aditivos orgânicos. A FEO associou, à degradação de aditivos orgânicos, a remoção do níquel. Foram avaliados efluentes sintéticos com composição similar a efluentes do processo de eletrodeposição de níquel contendo aditivos. Empregando o ânodo de Ti revestido com 70%TiO2/30%RuO2 sob incidência de radiação UV de uma lâmpada de vapor de mercúrio de 250 W e um cátodo de aço inox, 2,5 L de efluente foram tratados em um reator de 1,6 L, com vazão de recirculação de 1 L.min-1. Aplicando diferentes densidades de corrente, observou-se redução da DQO de até 83% e remoção de Ni acima de 90%. Os ensaios de citotoxicidade indicaram que a FEO não gerou intermediários mais tóxicos, pois não ocorreu aumento do efeito tóxico na comparação das soluções antes e após a FEO.Considering the growing concern about effluent toxicity, generated by the presence of metals and the occurrence of new organic pollutants, this study applied an advanced oxidation process (AOP, denominated the photo-electro-oxidation (PEO, for polishing after the effluent passed through the conventional wastewater treatment from the metal finishing industry that often does not satisfactorily remove metals and organic additives. PEO associated organic additive degradation with nickel removal. A synthetic wastewater, whose composition is similar to a nickel bath containing additives, was evaluated. Employing a Ti anode coated with 70%TiO2/30%RuO2 under an incidence of UV radiation from a mercury vapor lamp of 250 W and a stainless steel cathode, 2.5 L of

  15. Avaliação de Revestimentos de Liga de Níquel 625 Depositados pelo Processo Eletroescória

    Directory of Open Access Journals (Sweden)

    Soraia Simões Sandes

    Full Text Available Resumo A aplicação de revestimentos de ligas de níquel é comumente realizada na indústria de petróleo e gás para aumento da vida de equipamentos em ambientes agressivos, dado que este procedimento melhora a resistência à corrosão, sem um aumento significativo do custo de produção quando comparado com equipamentos maciços fabricados com outras ligas. Normalmente, as juntas são soldadas pelos processos de eletrodos revestidos, MIG/MAG ou TIG. Neste aspecto, o processo eletroescória realiza deposições com elevada energia de soldagem e baixa diluição, podendo ser uma opção interessante, uma vez que proporciona uma elevada produtividade, permitindo a soldagem com aplicação de apenas uma camada. O presente trabalho avalia propriedades mecânicas, microestruturais e de corrosão de revestimentos de liga de níquel 625 depositada em aço carbono ASTM A516 Grau 70 pelo processo eletroescória, tanto na condição como soldado quanto tratado termicamente. A deposição foi realizada com uma e duas camadas sobre chapas de dimensão 50x400x400 mm, na posição plana e energia de soldagem média de 11,7 kJ/mm. Após a soldagem realizou-se tratamento térmico a 620°C por 10 horas, sendo esta condição comparada ao estado de como soldado. Os ensaios de dobramento não indicaram evidências de defeitos. A avaliação microestrutural realizada por microscopia ótica (MO, eletrônica de varredura (MEV e eletrônica de transmissão (MET mostrou uma microestrutura austenítica para o depósito com pequena fração volumétrica de fases secundárias e o tratamento térmico de alívio de tensões não promoveu mudanças significativas nas propriedades. Na região de grãos grosseiros da zona termicamente afetada (RGGZTA foi observada a ocorrência de ferrita pró-eutetóide, perlita e bainita para o depósito com 1 camada e basicamente ferrita e perlita refinadas para o deposito com 2 passes devido às baixas taxas de resfriamento

  16. Impacts des évolutions démographiques et climatiques sur la répartition spatiale des hommes, des tsé-tsé et des trypanosomoses en Afrique de l’Ouest*

    Directory of Open Access Journals (Sweden)

    Courtin F.

    2009-03-01

    Full Text Available Les évolutions démographiques (population humaine multipliée par quatre en 50 ans, les changements climatiques et le développement économique survenus en Afrique de l’Ouest depuis maintenant un siècle ont profondément modifié le peuplement humain et les paysages dans lesquels il s’inscrit. Ces évolutions ne sont pas sans conséquences sur le complexe pathogène des trypanosomoses transmises par les glossines. En l’espace d’un siècle, la limite nord des tsé-tsé s’est déplacée vers le sud, accompagnant (mais à des échelles distinctes la descente des isohyètes et des foyers de maladie du sommeil, autrefois présents en savane et qui sont actuellement répartis en zone forestière et en zone de mangrove. On met en évidence un impact clair de la pression anthropique sur le recul des glossines du groupe morsitans, vecteurs majeurs des trypanosomoses animales. En revanche, les glossines du groupe palpalis (notamment Glossina palpalis s’adaptent aux fortes densités humaines et se maintiennent dans les plus grands centres urbains d’Afrique de l’Ouest, posant d’ailleurs la question du développement de foyers urbains dans les années à venir, comme en témoigne l’exemple récent de Kinshasa. L’étude des facteurs humains (dynamiques de peuplement et environnementaux (changements climatiques et leurs impacts dans l’espace et dans le temps, corrélée à celle des trypanosomoses et de leurs vecteurs devra permettre la mise en évidence des combinaisons spatiales capables d’expliquer la présence/absence de la maladie dans le but d’orienter les zones d’intervention médicale et anti-vectorielle. Ce type d’étude pourra être étendu à d’autres pathologies transmises par des vecteurs.

  17. Protección contra la corrosión de electrorrecubrimientos níquel/cobre utilizando la técnica PRC

    Directory of Open Access Journals (Sweden)

    William Aperador, Dionisio Laverde, Enrique Vera y Javier Guerrero

    2010-12-01

    Full Text Available Se presenta la implementación de la técnica de corriente pulsante inversa para electrodepositar películas delgadas de Cu-Ni en forma de bicapa sobre sustratos de zamac, controlando  los  voltajes  y  tiempos  de  electrodepósitos anódicos (Vlow, TLow y catódicos (VHight, THight y obteniendo como respuesta el monitoreo de la corriente anódica (ILow y catódica (IHight en función del tiempo anódico (TLow y catódico (THight respectivamente. Se obtuvieron películas de Cu (electrolitos cianurados y Ni (electroli tos  ácidos  con  espesores  entre  18  y  62 micrómetros. Se observó, mediante microscopía de fuerza atómica (AFM, que el control pulsante del voltaje durante el depósito permite obtener películas de Cu/Ni más densas y de mejor granulometría que las películas convencionales depositadas  por  la  técnica  de  corriente  directa.  Se determinó la composición química de las capas usando la sonda  de  difracción  de  rayos X  (EDX;  además,  se realizaron medidas de brillo y microdureza vickers de laúltima capa, correspondiente al níquel.

  18. DISEÑO DE UN SISTEMA DE VALORES COMPARTIDOS. CASO EMPRESA DE CONSTRUCCIÓN Y REPARACIONES DE LA INDUSTRIA DEL NÍQUEL

    Directory of Open Access Journals (Sweden)

    Ana Teresa Molina Álvarez

    2010-12-01

    Full Text Available En las condiciones de incertidumbre del mundo actual, constituye una necesidad para las organizaciones contar con valores sólidos que, asumidos por todos sus miembros, garanticen el cumplimiento de la misión y visión definidas. El presente trabajo se realiza en la Empresa de Construcción y Reparaciones de la Industria del Níquel y tiene como objetivo diseñar un sistema de valores compartidos, de forma que propicie el cambio en la organización. Se toma como punto de partida la misión y visión de la organización, análisis externo e interno, y el diagnóstico de la cultura de la organización; para lo cual se aplicaron diferentes instrumentos: encuestas, dinámicas grupales y procesos de observación. AbstractUnder the conditions of uncertainty of the current world, it constitutes a necessity for the organizations to have solid values that, assumed by all their members, guarantee the execution of the defined mission and vision.This investigation work is carried out in the Construction and Repairs´ Company of the Nickel Industry and its fundamental objective is to design a system of shared values so that it brings about the change in the organization.It takes as starting point the mission and vision of the organization, external and internal analysis, and the diagnosis of the organization culture. For that purpose were applied different instruments: interviews, group dynamics and observation processes.

  19. SÍNTESIS Y EVALUACIÓN DE FERRITA DE NÍQUEL OBTENIDA POR MECANOSÍNTESIS Y SU COMPARACIÓN CON FERRITA DE MANGANESO

    Directory of Open Access Journals (Sweden)

    FRANCISCO PRIETO

    2009-01-01

    Full Text Available El objetivo de este trabajo ha sido evaluar por comparación, las características de las ferritas de Ni y Mn, que han sido obtenidas partiendo de sus óxidos básicos por vía mecanosíntesis. El proceso se llevó a cabo a temperatura ambiente, en vacío; como medio de molienda esferas de acero de 3 mm de diámetro y frascos cilíndricos de 50 cm3 de capacidad, del mismo material; relación en peso de bolas/polvos de 10:1. El tiempo máximo del proceso fue de 12 horas. Fueron evaluadas por DRX, EAA, FTIR, MEB y se les midió permeabilidad magnética, distribución y tamaños de partículas. La obtención de estas ferritas por vía mecanosíntesis resulta efectiva pero no de mayores purezas, ni homogeneidades que las obtenidas por vía hidroquímica. El tiempo más eficiente del proceso oscila entre las 7-10 horas de molienda, ligeramente menor para la ferrita de manganeso. Se obtiene mayor fracción molar (0,90 en la ferrita de manganeso con relación a la de níquel; no resultaron significativamente homogéneas. En valores de permeabilidad magnética fue superior la ferrita de manganeso al igual que en tamaños de partículas.

  20. Efeito do níquel e da concentração protéica sobre o consumo e digestibilidade aparente da materia seca, proteína bruta, energia e balanço de nitrogênio do feno de Brachiaria brizantha cv. Marandu em ovinos Effect of nickel and protein concentration on consumption and apparent digestibility of dry matter, crude protein, energy, and nitrogen balance of a Brachiaria brizantha cv. Marandu hay, in ovines

    OpenAIRE

    O.J. De Paula; Graça,D.S.; Vasquez, E.A; MARTINS, R. G. R.

    2005-01-01

    Avaliaram-se os efeitos do níquel e da concentração protéica da dieta sobre o consumo e a digestibilidade aparente da matéria seca (MS), proteína bruta (PB) e energia, e balanço de nitrogênio do feno de Brachiaria brizantha cv. Marandu, oferecido a ovinos. As dietas testadas foram: A- feno; B- feno + níquel; C- feno + mistura protéica; D- feno + níquel + mistura protéica. As dietas continham, respectivamente 0,2, 5,2, 0,5 e 5,5ppm de níquel e 3,1, 3,1, 8,2 e 8,2% de PB. Nos níveis com menor c...

  1. Climatic change; Le Changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    Perthuis, Ch. de [Universite de Paris-Dauphine, 75 - Paris (France); Caisse des depots, Mission climat, 75 - Paris (France); Delbosc, A. [Caisse des depots, Mission climat, 75 - Paris (France)

    2009-07-01

    Received ideas about climatic change are a mixture of right and wrong information. The authors use these ideas as starting points to shade light on what we really know and what we believe to know. The book is divided in three main chapters: should we act in front of climatic change? How can we efficiently act? How can we equitably act? For each chapter a series of received ideas is analyzed in order to find those which can usefully contribute to mitigate the environmental, economical and social impacts of climatic change. (J.S.)

  2. Climate change; Le changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-07-01

    Based on contributions on 120 French and foreign scientists representing different disciplines (mathematics, physics, mechanics, chemistry, biology, medicine, and so on), this report proposes an overview of the scientific knowledge and debate about climate change. It discusses the various indicators of climate evolution (temperatures, ice surfaces, sea level, biological indicators) and the various factors which may contribute to climate evolution (greenhouse gases, solar radiation). It also comments climate evolutions in the past as they can be investigated through some geological, thermal or geochemical indicators. Then, the authors describe and discuss the various climate mechanisms: solar activity, oceans, ice caps, greenhouse gases. In a third part, the authors discuss the different types of climate models which differ by the way they describe processes, and the current validation process for these models

  3. Comparação do peso dos quelípodos e crescimento em duas espécies de "sirís" do gênero Callinectes (Brachyura, Portunidae

    Directory of Open Access Journals (Sweden)

    Cecilia Margarita Guerrero-Ocampo

    1998-08-01

    Full Text Available Neste trabalho, as espécies C. danae e C. ornatus foram comparadas quanto ao peso dos quelípodos. Os siris foram coletados com 2 redes de arrasto do tipo "otter trawl" na Enseada de Ubatuba (23° 26' S e 45° 02' W. As constantes alométricas obtidas foram analisadas por meio da função potência (Y = aXb . As espécies apresentaram diferentes graus alométricos para cada sexo. A relação PQ X PC apresentou alometria positiva em ambas espécies, porém os machos apresentam maior alometria positiva do que as fêmeas. C. danae apresenta maior alometria positiva para os quelípodos do que C. ornatus. O fato de C. danae atingir maior porte e possuir quelípodos maiores indica que esta espécie tem potencial para o cultivo.A comparison of the cheliped's weight in two species of the genus Callinectes was accomplished. The species C. danae e C. ornatus were collected by two otter trawl in Ubatuba bay (23º 26' S and 45º 02' W. The allometric constants obtained from the regression adjusted to a power function (Y = aXb were analyzed. These species presented different allometry degrees for each sex considered. The relation PQ x PC presented positive allometry for sex of both species, but male presented higher positive allometry than female. C. danae presented higher positive allometry for chelipeds than C. ornatus. We suggest here that C. danae could be indicated to be submitted to grow out in ponds since it reaches higher size and bigger chelipeds.

  4. Influencia de los parámetros de soldeo fuerte en la microestructura y propiedades mecánicas de la unión de la aleación base níquel Hastelloy B2

    Directory of Open Access Journals (Sweden)

    Sotelo, José Carlos

    2014-09-01

    Full Text Available A study of the high vacuum brazing process of solid solution strengthened Hastelloy B2 nickel alloy has been done. A first stage of research has focused on the selection of the most appropriate brazing filler metal to the base material and vacuum furnace brazing process. The influence of welding parameters on joint microstructure constituents, relating the microstructure of the joint to its mechanical properties, has been evaluated. Two gaps of 50 and 200 micrometers, and two dwell times at brazing temperature of 10 and 90 minutes were studied. The braze joint mainly consists of the nickel rich matrix, nickel silicide and ternary compounds. Finally, the results of this study have shown the high bond strength for small gaps and increased dwell times of 90 minutes.Se realizó un estudio pormenorizado del proceso de soldeo fuerte en horno de alto vacío de la aleación base níquel Hastelloy B2 fortalecida por solución sólida. En una primera fase del trabajo se seleccionó el material de aporte acorde al material objeto de unión y a la fuente de calentamiento seleccionada. Posteriormente, se evaluó la influencia del gap (50 y 200 micrómetros y tiempo de permanencia a temperatura de soldeo (10 y 90 minutos sobre los microconstituyentes de la unión, relacionando la microestructura con las propiedades mecánicas de la junta. Los análisis metalográficos mostraron una unión constituida por una matriz rica en níquel, siliciuros de níquel y compuestos ternarios. Finalmente, los resultados de los ensayos mecánicos a esfuerzos cortantes mostraron una elevada resistencia para gaps de 50 micrómetros y tiempos de permanencia de 90 minutos.

  5. In vitro effect of 470 nm LED (Light Emitting Diode in keloid fibroblasts Efeito in vitro do LED (Light Emitting Diode de 470 nm em fibroblastos de quelóide

    Directory of Open Access Journals (Sweden)

    Silvilena Bonatti

    2011-02-01

    Full Text Available Purpose: To quantify keloid fibroblasts after irradiation with 470nm blue LED, in vitro. Methods: Fibroblasts from keloid and adjacent skin have been obtained from 6 patients. Cells have been cultivated and maintained in DMEM culture medium. In Petri dishes, they were irradiated with energy doses of 6J, 12J and 18J. After 24 h, counting was done by the average of the triplicates for each sample. Results: There were no significant differences in the number of irradiated keloid fibroblasts at the studied doses (p=0.261. In adjacent skin fibroblasts, differences were observed (p=0.025 concerning the doses of 18 J and 6 J (p=0.03. Conclusions: There was a reduction in the number of adjacent skin fibroblasts irradiated with 470nm blue LED at the energy dose of 18 J compared to the ones irradiated at the energy dose of 6 J. There were no changes in keloid fibroblasts counting at any of the doses applied, 24 h after irradiation.Objetivo: Quantificar fibroblastos de quelóide após irradiação com LED azul de 470nm, in vitro. Métodos: Foram obtidos fibroblastos de quelóide e pele adjacente, de seis pacientes. As células foram cultivadas e mantidas em meio de cultura DMEM. Em placas de Petri, receberam irradiação com doses de energia de 6J, 12J e 18J. Após 24 horas a contagem foi feita pela média da triplicata para cada amostra. Resultados: Não houve diferença na quantidade de fibroblastos de quelóide irradiados nas doses estudadas (p=0,261. Observou-se diferença nos fibroblastos de pele adjacente (p=0,025, com relação às doses de 18 J e 6 J (p=0,03. Conclusões: Houve redução dos fibroblastos de pele adjacente irradiados com LED azul de 470 nm na dose de energia de 18 J em relação à dose de 6 J. Não houve alteração na quantidade de fibroblastos de quelóide nas doses aplicadas após 24 horas da irradiação.

  6. Modificación superficial de un acero maraging de bajo contenido en níquel mediante técnicas de fusión superficial con láser

    OpenAIRE

    Roman Caldelas, Manuel

    2013-01-01

    En este trabajo se analiza la posibilidad de emplear un haz láser de Nd:YAG de alta potencia para modificar la superficie de un acero maraging de bajo contenido en níquel (14%), grado 200, por refusión superficial. La utilización de aceros de herramientas está ampliamente extendida en procesos de fabricación industriales como el corte, el mecanizado y el moldeo por inyección. Las muy buenas propiedades que presentan estas aleaciones están normalmente asociadas a un elevado precio, derivado...

  7. Recuperação de cobalto de baterias de níquel metal-hidreto (Ni-MH) via extração seletiva com cyanex 272

    OpenAIRE

    Barandas,Ana Paula Mauro Gonçalves; Afonso,Júlio Carlos; Mantovano,José Luiz; Cunha,José Waldemar Silva Dias da

    2007-01-01

    A extração de metais com solventes orgânicos é uma poderosa ferramenta para ajudar a separação de complexas misturas de metais presentes em baterias usadas e dispositivos eletroeletrônicos, evitando assim o uso de produtos tóxicos ou de rotas experimentais geradoras de uma grande quantidade de resíduos finais. Este trabalho descreve um processo de recuperação de cobalto presente em baterias níquel metal-hidreto (Ni-MH) usadas por meio de uma nova rota hidrometalúrgica. O elemento foi extraído...

  8. Metabolismo do nitrogênio e senescência em razão da aplicação de níquel no cafeeiro arábica

    OpenAIRE

    Tiago Tezotto

    2015-01-01

    O nitrogênio é o nutriente exigido em maior quantidade pelo cafeeiro e o segundo mais exportado pela planta. Usualmente se aplica ureia no cafeeiro e o N desta fonte é rapidamente metabolizado e incorporado na forma de aminoácidos e amidas. A assimilação do nitrogênio é afetada por diversos micronutrientes, entre eles o níquel (Ni), por ser este um constituinte da enzima urease, responsável pela degradação da ureia. O entendimento da interação do Ni com o metabolismo do N e o processo de sene...

  9. Modelación de los contenidos de hierro en yacimientos lateríticos heterogéneos de níquel y cobalto. Caso de estudio, yacimiento Moa Oriental

    Directory of Open Access Journals (Sweden)

    Adrian Martínez-Vargas

    2007-03-01

    Full Text Available Este trabajo se centra en la necesidad de modelar con mayor precisión, en soporte de bloque, los contenidos de hierro de yacimientos lateríticos heterogéneos de níquel y cobalto, compuestos por menas oxidadas y silicatadas. Como principal resultado se obtiene por primera vez, un modelo matemático para describir el comportamiento de los contenidos de hierro en el perfil laterítico, lo que permite realizar estimaciones más precisas que las obtenidas con el krigeage ordinario univariado, tradicionalmente empleado para modelar esta variable.

  10. L’autorégulation conjointe de la cognition et des émotions : quel impact sur les apprentissages ?

    Directory of Open Access Journals (Sweden)

    Bastien Wagener

    2015-05-01

    Full Text Available Les apprentissages consistent à résoudre des problèmes et à acquérir de nouvelles connaissances et compétences par le biais d’un ensemble de processus relevant de l’autorégulation. Deux aspects principaux rentrent en ligne de compte lorsque l’on cherche à améliorer la résolution de problèmes : la dimension émotionnelle et la métacognition. Les émotions, en tant que réactions organisées et utiles à une situation donnée, peuvent être tour à tour un atout ou un handicap lorsqu’il s’agit d’apprendre. Par ailleurs, la métacognition est constituée d’un ensemble de processus et de savoirs qui s’articulent autour de la prise de conscience et de la régulation de son propre fonctionnement, qu’il soit cognitif ou émotionnel. Grâce aux pratiques de l’attention (PA, issues de traditions permettant un travail sur la conscience et la régulation psychologique et physiologique, il est possible d’agir conjointement sur les cognitions et les émotions. Plusieurs travaux ont montré les nombreux bénéfices que présentent de telles approches et nous constatons également que les effets positifs sur l’autorégulation commencent à être de plus en plus étayés. Nous proposons donc de nouvelles approches holistiques permettant un travail global sur l’autorégulation qui prendraient en compte le traitement métacognitif des sphères cognitive et émotionnelle au bénéfice des apprenants. Simultaneous self-regulation of cognition and emotions and its consequences on learning Abstract: The learning process relies on problem-solving activities and the acquisition of knowledge and skills through self-regulation. Emotions and metacognitions are some of the key aspects that allow the improvement of problem-solving. The emotional dimension consists of structured and useful reactions in regard to a specific situation. Emotions can either be an asset or a disadvantage when one is involved in a learning situation. As for

  11. Relato Preliminar sobre a Concentração Sanguínea de Níquel Após Oclusão Percutânea de Comunicação Interatrial com a Prótese Cocoon®

    OpenAIRE

    Badran,André Vannuchi; Haddad,Jorge Luis; Pavão, Rafael Brolio; Novaes, Gustavo Caires; Lago, Igor Matos; Figueiredo,Geraldo Luiz de; Lima-Filho,Moysés de Oliveira; Romano, Minna Moreira Dias; Marin-Neto,J. Antônio

    2014-01-01

    Introdução: A possibilidade de ocorrer liberação de níquel na corrente sanguínea após implante de dispositivos oclusores de comunicação interatrial de última geração (Cocoon Septal Occluder®), cujo principal componente é o nitinol (55% de níquel e 45% de titânio), ainda permanece controversa, principalmente em determinados grupos de pacientes, como crianças e mulheres em idade fértil. Dessa maneira, o ob...

  12. Peuples et évolution climatique en Afrique nord-tropicale, de la fin du Néolithique à l’aube de l’époque moderne Peoples and climate change in northern tropical Africa from the end of the Neolithic till the dawn of the modern era

    Directory of Open Access Journals (Sweden)

    Jean Maley

    2013-05-01

    Full Text Available La fin du Néolithique, au cours du IIIe millénaire BP, a correspondu à l’affaiblissement des périodes humides et à la mise en place de la géographie actuelle dans la zone sud-saharienne et sahélienne, qui s’étend de l’Atlantique au lac Tchad. Depuis cette époque le climat a cependant continué à beaucoup varier. La succession des différents épisodes climatiques, phases humides ou phases arides – et leurs interactions complexes –, est précisée. Ces faits climatiques sont mis en parallèle avec l’évolution archéologique et historique des différentes phases culturelles. Dans cette immense région, souvent à la limite de conditions naturelles extrêmes, les évènements climatiques ont toujours eu des conséquences très importantes sur l’évolution des peuplements humains. Le relativement bon synchronisme des principaux changements culturels, d’ouest en est à travers la bande sahélienne, paraît avoir été fréquemment contrôlé par le rôle directeur des changements climatiques majeurs et des variations environnementales qui en ont résulté.At the end of the Neolithic Era, during the third millennium BCE, there were fewer humid periods of weather, and the sub-Saharan Sahelian zone, from the Atlantic to Lake Chad, assumed its current geographical form. Since then, the climate has continued undergoing major variations. The succession of climatic episodes, humid or dry, is pointed out along with their complex interactions. These variations are placed in parallel to cultural phases of evolution in archeology and history. Climate-related events have always had heavy consequences on the peopling of this vast region, often subject to extreme natural conditions. The relative synchronism between the principal cultural trends from west to east across the Sahel seems to have often been subject to swings in the climate and the resulting environmental changes.

  13. Caracterización físico-química y mineralógica de la escoria de fundición de ferroníquel de Moa

    Directory of Open Access Journals (Sweden)

    Yaritza Ramírez-Cruz

    2013-12-01

    Full Text Available La escoria de fundición de ferroníquel obtenida a escala piloto a partir del mineral saprolítico del yacimiento Moa Occidental, se caracterizó desde el punto de vista físico, químico y mineralógico con el objetivo de evaluar sus posibilidades de utilización industrial. Mediante Espectrometría por Fluorescencia de Rayos X y Difracción de Rayos X se constató que en su composición existen fundamentalmente óxidos de silicio y magnesio, con valores promedios de 46% el primero y 37 % el segundo. El olivino, la forsterita y la clinoenstatita se identificaron como sus fases mineralógicas principales. La densidad es de 3,20 g/cm 3 ; temperatura de fusión de 1 650ºC y viscosidad de 6,5 poises. Estos resultados evidenciaron similitud con escorias de ferroníquel obtenidas en otras partes del mundo, que son usadas como material abrasivo, material de construcción y refractario

  14. Estudio cinético del proceso de precipataión de los sulfuros de níquel y cobalto con hidrógeno sulfuro de sodio, en el licor de desecho (WL

    Directory of Open Access Journals (Sweden)

    Mercedes Sosa-Martínez

    2006-03-01

    Full Text Available En el trabajo se realiza un estudio cinético del proceso de precipitación de sulfuros a partir del licor residual WL que se genera en la Empresa Moa Níckel S. A -Pedro Soto Alba. La investigación se realiza a escala de laboratorio empleando una variante de tratamiento del licor en dos etapas de precipitación a diferentes valores de pH, donde se analiza la influencia de los factores que intervienen en el proceso como la temperatura, concentración de hidrógeno sulfuro de sodio y el régimen de agitación, basado en el método factorial completo donde se conjugan los niveles experimentales de las variables estudiadas respecto al grado de precipitación de los principales elementos níquel cobalto, cinc, y cobre. En la primera etapa se logra obtener una mezcla de sulfuros mixtos ricos en  cobre y cinc con extracciones superiores  a  80 % y 64 % respectivamente, mientras que en la segunda etapa se obtiene un precipitado de color negro correspondiente a los sulfuros de níquel y cobalto cuyas recuperaciones alcanzan valores de 84% y  82%.

  15. Determinación de trazas de Molibdeno (VI, Níquel (II y Vanadio (V en cementos por polarografía diferencial de impulsos

    Directory of Open Access Journals (Sweden)

    Gaspar-Tebar, Demetrio

    1985-09-01

    Full Text Available In this work an account is given of the results obtained when the differential pulse polarography (differential pulse anodic stripping voltametry is applied to the determination of the contents of the compounds by molybdenum (VI, nickel (II and vanadium (V in a common portland cement which are in quantities of the order of p.p.m. Those studies show that it is not possible to determine simultaneaously the content of the three mentioned ions in the cement, but if working in acid medium (hydrochloridric and sulphuric, in ammoniacal or cyanided medium and in basic medium (produced by NaHCO3 polagrogrammes are obtained which allow to complete those mentioned determinations of Mo (VI in the first medium, of Ni (II in the second and of V(V in the third. Because of the high sensibility of the polarography it is possible to determine the Ni (II which is found in quantities from 2.9 to 3.4 p.p.m. (0.0002g to 0.00034 %, in mass.

    En el presente trabajo se da cuenta de los resultados obtenidos cuando se aplica la polarografía diferencial de impulsos a la determinación de los contenidos de compuestos a base de molibdeno (VI, níquel (II y vanadio (V en un cemento portland industrial; dichos contenidos se encuentran en cantidades del orden de p.p.m. En los estudios realizados se ha puesto de manifiesto que no es posible determinar simultáneamente el contenido de los tres iones mencionados en el cemento, pero que trabajando en medio ácido (clorhídrico o sulfúrico, en medio amoniacal o cianurado y en medio básico (producido por NaHCO3 se obtienen polarogramas que permiten realizar las mencionadas determinaciones cuantitativas de Mo (VI en el primer medio, de Ni (II en el segundo y de V (V en el tercero. Gracias a la alta sensibilidad de la polarografía ha sido posible determinar la concentración de Ni (II en el cemento estudiado, que se encuentra en cantidades comprendidas entre 2,9 y 3,4 p.p.m. (0

  16. Migración de hierro y níquel, y estabilidad oxidativa del aceite refinado de soja calentado en utensilios culinarios de diversos materiales

    Directory of Open Access Journals (Sweden)

    Almeyda Haj-Isa, Niurka Maritza

    2007-12-01

    Full Text Available Cookware may release some inorganic components into foods during cooking, some of which have undesirable consequences. In fried foods, for instance, oil oxidation is favored by metals. The present study evaluated oxidative stability (AOCS method and iron and nickel migration (inductively coupled plasma-optical emission spectrometry into refined soybean oil in four cycles, with intervals of 24 hours. The cookware materials were glass, aluminum, stainless steel, iron and soapstone. The results demonstrated that the lowest metal migration occurred from glass and aluminum pans while the oil heated in these pans showed the highest oxidative stability. The highest migration of Fe and Ni into the oil occurred from the soapstone and iron pots (3.94 and 3.21 mg _ kg-1, respectively.Nevertheless, increasing loss of oxidative stability was evident in the oils heated in the soapstone, stainless steel and iron cookware, in this order. Since iron migration was lower from glass and aluminum pans, these were considered the best type of materials for fryingDurante la elaboración de alimentos los utensilios culinarios pueden liberar componentes inorgánicos ocasionalmente no deseables. La oxidación del aceite es durante la fritura es favorecida por la presencia de metales. Fue evaluada la migración de hierro y níquel (espectrometría de emisión óptica y la estabilidad oxidativa (método AOCS del aceite de soja sometido a cuatro calentamientos con intervalos de 24 horas en cazuelas de vidrio, aluminio, acero inoxidable, hierro y piedra-jabón. La mayor migración de hierro al aceite ocurrió en las cazuelas de hierro (3,94 mg•kg–1 y piedra (3,21 mg _ kg–1, sin diferencia estadística entre ellas. La pérdida progresiva de estabilidad oxidativa fue acentuada en los aceites calentados en utensilios de piedra, acero inoxidable e hierro, en tal orden. Vidrio y aluminio fueron considerados los mejores materiales para la fabricación de cazuelas

  17. LA GOUVERNANCE DES ASSOCIATIONS : QUELS ACTEURS, QUELS MECANISMES ?

    OpenAIRE

    Zoukoua, Eric-Alain

    2005-01-01

    International audience; L'étude de la gouvernance dans les associations permet d'explorer un champ jusque là oublié par la plupart des études sur la gouvernance dans le contexte français. Tout en identifiant les acteurs et les différents mécanismes de gouvernance mis en place par ceux-ci, cette étude permet de soulever la question de l'adaptabilité à ces organisations des mécanismes usuellement recommandés et nous invite à explorer d'autres approches de la gouvernance.

  18. Quel gestion de carrière pour quels seniors ?

    OpenAIRE

    Carrer, Leslie-Anne

    2007-01-01

    Ce document pose un des aspects de l'objet de la recherche.; Document LEST. Séminaire de thèse; Plus de 30 années de dispositifs divers pour favoriser le départ des plus anciens auront eu des conséquences importantes sur la façon dont les dirigeants d'entreprises considèrent leurs salariés les plus âgés. Les divers recours aux préretraites ont non seulement constitué une catégorie de jeunes retraités actifs, mais ils ont aussi contribué à créer une image du travailleur vieillissant bien spéci...

  19. Globalization, Globalisation

    OpenAIRE

    Ethier, Wilfred J.

    2002-01-01

    This paper addresses a complex of globalization issues: the effect of globalization on the skill premium; the effect of globalization on unemployment; the relative importance of globalization and exogenous technical change; the effect of globalization on the ability of national governments to conduct independent social policies. Thinking about these topics has been dominated by a large empirical literature concluding that trade has played a relatively minor role in the rise of the skill premi...

  20. Against Globalization

    DEFF Research Database (Denmark)

    Philipsen, Lotte; Baggesgaard, Mads Anders

    2013-01-01

    In order to understand globalization, we need to consider what globalization is not. That is, in order to understand the mechanisms and elements that work toward globalization, we must, in a sense, read against globalization, highlighting the limitations of the concept and its inherent conflicts....... Only by employing this as a critical practice will we be analytically able to gain a dynamic understanding of the forces of globalization as they unfold today and as they have developed historically....

  1. Atlas du réchauffement climatique 1971-2010. Publié par Physio-Géo - collection Ouvrages, 2012, 122 p.En ligne sur : http://www.physio-geo.fr (onglet "Ouvrages".

    Directory of Open Access Journals (Sweden)

    Jean-Claude Flageollet

    2012-06-01

    Full Text Available Cet atlas présente le réchauffement climatique récent, de 1971 à 2010, dans les terres émergées continentales et océaniques découpées en 39 régions dont, pour certaines d'entre elles, les limites sont proches des limites des régions climatiques du globe telles que définies et tracées par exemple par KÖPPEN et GEIGER. Les températures utilisées sont les moyennes annuelles empruntées à la base de données "Gistemp" de la NASA, complétées par calcul et par station. Dans chaque région, sont représentées graphiquement l'évolution des températures annuelles, selon l'environnement des stations, rural, urbain ou intermédiaire, ainsi que la valeur du réchauffement, par périodes pluri annuelles et décennales. En outre, les stations, classées en deux catégories en comparant leurs températures de 2009 et 2010, sont localisées sur des cartes à l'échelle de chaque continent. Quatre cartes régionales du réchauffement sont produites pour les périodes 1971-2010, 1981-2010, 1991-2010 et 2001­2010. Elles permettent de distinguer les régions en réchauffement et les régions en refroidissement, ces dernières concernant principalement les deux dernières décennies.This atlas presents the recent warming, from 1971 to 2010, in the continental and oceanic earth's land surface, divided into 39 regions which, for some of them, the limits are close to the earth's climatic regions defined and delineated by KÖPPEN and GEIGER. The temperatures used are annual averages taken from the "Gistemp" data base of the NASA, supplemented by calculation and by station. In each region, graphs and diagrams represent the evolution of annual temperatures as well as pluri-annual, decadal and multi decadal periods of warming, depending on the environment of stations: rural, urban or intermediate. In addition, the stations, divided into two categories by comparing their temperatures of 2009 and 2010, are located on each continent-scale maps. Four

  2. Global Strategy

    DEFF Research Database (Denmark)

    Li, Peter Ping

    2013-01-01

    Global strategy differs from domestic strategy in terms of content and process as well as context and structure. The content of global strategy can contain five key elements, while the process of global strategy can have six major stages. These are expounded below. Global strategy is influenced...... by rich and complementary local contexts with diverse resource pools and game rules at the national level to form a broad ecosystem at the global level. Further, global strategy dictates the interaction or balance between different entry strategies at the levels of internal and external networks....

  3. Efecto del tratamiento térmico posterior sobre la resistencia al desgaste por deslizamiento de un recubrimiento base níquel depositado por HVOF

    Directory of Open Access Journals (Sweden)

    Cadenas, P.

    2007-02-01

    Full Text Available In the present research, a nickel base coating was deposited on an AISI 1020 substrate by using high velocity oxy-fuel technique (HVOF. The coating was subsequently post heat -treated by means of an oxyacetylene flame. For the conditions evaluated in the present study, it was found that the CTT coating has 1,15 better wear resistance for the smaller level of the applied load and nearly 50 times for the highest level of the applied load when compared to the STT coatings. These results have been attributed to a better distribution of the hard phases, better cohesion between particles and an increase in hardness, as consequence of the post heat treatment process. A severe wear regime was found for all the samples since the wear rates presented values which were higher than 1·10-5 mm3/m. For the CTT coatings, the wear mechanism was mainly due to the adhesion and oxidation phenomena, meanwhile for the steel counterpart mechanisms such oxidation, grooving and three body abrasion were observed.

    En el presente trabajo, se depositó un recubrimiento base níquel sobre un acero AISI 1020 por la técnica de termorrociado de alta velocidad que utiliza oxígeno como combustible (High Velocity Oxygen Fuel - HVOF y, posteriormente, fue tratado térmicamente mediante llama oxiacetilénica. Para las condiciones evaluadas en este estudio, se encontró que el recubrimiento CTT tiene desde 1,15 veces más resistencia al desgaste, para el menor nivel de carga aplicada y mayor velocidad de deslizamiento y, hasta 50 veces más resistencia al desgaste para el mayor nivel carga aplicada y mayor velocidad de deslizamiento, comparado con el recubrimiento STT. Estos resultados se atribuyeron a una mejor distribución de las fases endurecedoras, una mejor cohesión entre partículas y un aumento en la microdureza del recubrimiento, como consecuencia del tratamiento térmico posterior. El régimen de desgaste presente en todas las muestras fue severo, ya que las

  4. Estrés producido por sedimentos contaminados con níquel en una granja de trucha arcoiris, Oncorhynchus mykiss (Pisces: Salmonidae

    Directory of Open Access Journals (Sweden)

    Laura Martínez-Tabche

    2002-12-01

    Full Text Available Estudios previos indicaron la presencia de elevadas concentraciones de níquel (Ni en los estanques de la granja "El Truchón", por tal motivo fue necesario establecer correlaciones entre las propiedades fisicoquímicas de los sedimentos de este embalse y el daño que puede producirse sobre la trucha arcoiris cuyo cultivo se lleva a cabo en un reservorio denominado rústico. El estudio se inició con la determinación de las propiedades fisicoquímicas de los sedimentos de la granja, las cuales incluyeron: composición granular, porcentaje de nitrógeno total, contenido de materia orgánica, pH, potencial redox, capacidad de intercambio canónico y la concentración de Ni. Se determinó la CLSO del Ni-96 H sobre Oncorhynchus mykiss en el sistema agua-sedimentos de la granja-metal al equilibrio. En este mismo sistema se evaluó la toxicidad subletal del Ni, mediante la determinación de niveles de metalotioneina (MT, la actividad de la o-desmetilasa (OD y la concentración de proteínas. Los resultados muestran un incremento significativo en los tres parámetros bioquímicos, observándose una relación linear entre efecto y concentración del Ni, por lo que estos biomarcadores de daño se recomiendan para evaluar la toxicidad del Ni. Probablemente estos efectos se deban a las propiedades fisicoquímicas del sedimento que le confiere alta capacidad de absorber el metal. De acuerdo a los resultados obtenidos en este estudio se sugiere al truticultor no emplear estanques rústicos, sino aquellos revestidos de concreto, para evitar la acumulación de sustancias tóxicas o bien realizar remociones periódicas de su sedimento.Previous studies indicated the presence of high concentrations of nickel in the "El truchón" ponds (in México, so it was necessary to find a possible correlation between sediment physicochemical properties of this water body and the damage that could be produced on the rainbow trout which culture is done in a rustic reservoir

  5. Globalization & technology

    DEFF Research Database (Denmark)

    Narula, Rajneesh

    Technology and globalization are interdependent processes. Globalization has a fundamental influence on the creation and diffusion of technology, which, in turn, affects the interdependence of firms and locations. This volume examines the international aspect of this interdependence at two levels...

  6. Global Health

    Science.gov (United States)

    ... globalhealth/what/default.htm) CDC protects Americans through global health. frame support disabled and/or not supported ... Public Health Emergencies More stories Infographic More infographics Global Health & You OUTBREAKS DISEASES & CONDITIONS TRAVEL CDC JOBS ...

  7. Long term impact of climate change on the metropolitan coast; Impacts a long terme du changement climatique sur le littoral metropolitain

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    In its first part, this report describes global physical phenomena: air and sea temperature rise, modification of the tempest regime, precipitations, ocean stratification. Then, it describes some more specific physical effects of climate change: average sea level rise, sea currents (global, regional and local oceanic circulation), and wave modification on the coast. It describes the effects of various media due to sea submersion, erosion and accretion, ocean acidification, salinization increase of underground coastal waters, modification of the composition of biotic communities, biological invasions, and appearance of new toxicities for mankind

  8. PEMANASAN GLOBAL

    Directory of Open Access Journals (Sweden)

    Vivi Triana

    2008-03-01

    Full Text Available Pemanasan global (global warming pada dasarnya merupakan fenomena peningkatan temperature global dari tahun ke tahun karena terjadinya efek rumah kaca (greenhouse effect yang disebabkan oleh meningkatnya emisi gas-gas seperti karbondioksida (CO2, metana (CH4, dinitrooksida (N2O dan CFC sehingga energy matahari terperangkap dalam atmosfer bumi. Berbagai literatur menunjukkan kenaikan temperatur global termasuk Indonesia yang terjadi pada kisaran 1,5 – 40 °C pada akhir abad 21.

  9. Perfuração dos lóbulos das orelhas como fator de risco para o desenvolvimento de alergia de contato ao níquel Ear piercing as a risk factor for contact allergy to nickel

    Directory of Open Access Journals (Sweden)

    Marilda H. T. Brandão

    2010-04-01

    Full Text Available OBJETIVOS: Determinar a prevalência da alergia de contato aos metais em crianças que frequentam um centro de saúde e caracterizar o subgrupo com alergia em relação aos fatores de risco. MÉTODOS: Estudo transversal não controlado, conduzido em um centro de saúde de Belo Horizonte (MG. Foram incluídas crianças com idades entre 0 e 12 anos que se apresentaram para consulta pediátrica de rotina, sendo aplicados testes de contato para o cromo, o cobalto e o níquel. As análises estatísticas foram realizadas com base na leitura do teste em 96 horas. Leituras classificadas como fraca (+, forte (++ ou extrema (+++ foram consideradas como reação, enquanto as classificadas como duvidosa, negativa ou irritativa foram consideradas como não reação. RESULTADOS: Completaram o estudo 144 crianças. Destas, 4,9% apresentaram reação ao cromo, 9,7% ao cobalto e 20,1% ao níquel. Os pacientes com orelha perfurada tiveram mais chance de reação ao níquel do que aqueles sem essa característica (p = 0,031 e odds ratio = 2,8. CONCLUSÕES: Em face da tendência atual ao aumento da alergia ao níquel, familiares devem ser alertados sobre a sua associação com a perfuração das orelhas. Estudos posteriores são necessários para avaliar a idade ideal para a perfuração das orelhas e o material ideal para brincos.OBJECTIVES: To determine the prevalence of metal contact allergy among the children seen at a health center and to characterize children with metal allergies in terms of risk factors. METHODS: This was an uncontrolled cross-sectional study undertaken at a health center in Belo Horizonte, Brazil. Children aged from 0 to 12 years were recruited when they presented at the health center for routine pediatric consultations and were given contact tests for chrome, cobalt and nickel. Statistical analyses were conducted on test readings taken at 96 hours. Results classed as weak (+, strong (++ or extreme (+++ were defined as "reaction," while

  10. Avaliação da instrumentação rotatória com limas de níquel e titânio, K3 e RaCe, em canais radiculares curvos simulados

    OpenAIRE

    Leonardi, Denise Piotto

    2004-01-01

    Foram analisadas, comparativamente, a ação e a presença de deformações proporcionadas pela instrumentação com limas manuais Flexofile e dois Sistemas Rotatórios de Limas Endodônticas de Níquel e Titânio: o Sistema K3 (SDS Kerr) e o Sistema Race (FKG), sobre as paredes dos canais radiculares curvos simulados em blocos de resina. Foram utilizadasa as técnicas manual e ultra-sônica de irrigação. Após a instrumentação, os blocos de resina foram digitalizados, analisados e estabelecido escores de ...

  11. Controle na distribuição das lateritas e saprolitos de alto teor no depósito de níquel laterítico do Jacaré, Distrito de Carajás, Brasil

    OpenAIRE

    Francisco Tomazoni Neto

    2011-01-01

    O Depósito de classe mundial de níquel laterítico do Jacaré (495Mt @ 1,19% Ni) localizase cerca de 52 Km em linha reta, a NNE do município de São Félix do Xingu/PA - Província Mineral de Carajás. O depósito ocorre em rochas essencialmente duníticas e gabróicas magmaticamente acamadadas, com níveis peridotiticos e/ou piroxeníticos subordinados. Os horizontes saprolíticos são, de fato, os portadores das maiores concentrações de Ni e estas, por sua vez, apresentam os minerais do grupo da serpent...

  12. Obtención y caracterización de aceros inoxidables libres de níquel mediante aleación mecánica para su uso como biomateriales

    OpenAIRE

    García González, Flavio

    2015-01-01

    Obtención y procesado de aceros inoxidables altos en nitrógeno y libres de níquel, por aleación mecánica mediante pulvimetalurgia para su uso como biomateriales. Análisis de la influencia de las variables metalúrgicas del procesado en el comportamiento en servicio de los aceros sinterizados en atmósferas de nitrógeno-hidrógeno y en vacío. Estudio de los efectos de la cinética de enfriamiento de la fase de sinterizado y de tratamientos térmicos postsinterizado. Caracterización mecánica de las ...

  13. Modelo matemático del proceso de calcinación del carbonato básico de níquel (cbn en el horno tubular rotatorio

    Directory of Open Access Journals (Sweden)

    José Luis Sevila-Rodríguez

    2000-03-01

    Full Text Available El presente trabajo recoge los resultados de los autores en lo relacionado con la modelación matemática del proceso de calcinación del carbonato básico de níquel en el horno tubular rotatorio. Se exponen las ecuaciones que conforman el modelo y la fundamentación científica sobre la cual fueron obtenidas. La modelación se basa principalmente en el planteamiento de las ecuaciones del balance material y energético en forma dinámica, que lleva a la obtención de un sistema de ecuaciones diferenciales en derivadas parciales, las cuales se complementan con otras ecuaciones algebraicas que establecen la relación entre los diferentes coeficientes y parámetros físicos.

  14. Dermatite de contato por metais: prevalência de sensibilização ao níquel, cobalto e cromo Metal contact dermatitis: prevalence of sensitization to nickel, cobalt and chromium

    Directory of Open Access Journals (Sweden)

    Ida Duarte

    2005-04-01

    Full Text Available FUNDAMENTOS: Dermatite de contato (DC por metais é dermatose comum em diversos grupos populacionais. OBJETIVOS: Caracterizar o grupo com DC ao níquel, cromo e cobalto na população estudada, determinar a prevalência da sensibilização aos mesmos, verificar as combinações de testes positivos e comparar com a literatura. CASUÍSTICAS E MÉTODOS: Foram realizados testes epicutâneos em 1.208 pacientes com hipótese diagnóstica de DC. Selecionaram-se aqueles com testes positivos aos metais. RESULTADOS: Obtiveram-se 404 pacientes (33,5% da amostra com pelo menos um teste positivo ao níquel e/ou cobalto e/ou cromo. Foram 487 testes positivos a metais, correspondendo a 48% de todos os testes positivos. A maioria dos pacientes era do sexo feminino (72%, de cor branca (54%, com idade entre 40 e 49 anos (25% empregada na área de limpeza (59%. Dos 404, 329 (81,5% foram positivos a apenas um tipo de metal, sendo 60% com teste positivo ao níquel, 13% ao cromo e 8,5% ao cobalto. Cerca de 18,5% apresentaram testes positivos a dois ou três metais, sendo a associação níquel/cobalto a mais comum. CONCLUSÕES: A sensibilização aos metais foi de 48%, entre os testes positivos e ocorreu principalmente em mulheres da cor branca, na faixa etária de 40 a 49 anos e sem correlação ocupacional. A maioria apresentou sensibilização a apenas um metal. Esses dados são semelhantes aos de outros trabalhos já publicados.BACKGROUND: Metal contact dermatitis (nickel, cobalt and chromium is a common dermatosis among several population groups. OBJECTIVE: To describe the individuals with metal contact dermatitis in the group studied, to determine the prevalence of skin sensitization by nickel, cobalt and chromium, to verify the positive test combinations among these three substances and to compare our results with the literature. PATIENTS AND METHODS: Patch test was performed in 1208 patients with a presumptive diagnosis of contact dermatitis. Those with

  15. Global Education.

    Science.gov (United States)

    Longstreet, Wilma S., Ed.

    1988-01-01

    This issue contains an introduction ("The Promise and Perplexity of Globalism," by W. Longstreet) and seven articles dedicated to exploring the meaning of global education for today's schools. "Global Education: An Overview" (J. Becker) develops possible definitions, identifies objectives and skills, and addresses questions and…

  16. Global HRD.

    Science.gov (United States)

    1997

    This document contains four papers from a symposium on global human resource development (HRD). "Globalization of Human Resource Management (HRM) in Government: A Cross-Cultural Perspective" (Pan Suk Kim) relates HRM to national cultures and addresses its specific functional aspects with a unique dimension in a global organization.…

  17. Evaluación de la resistencia a la corrosión erosión de recubrimientos de níquel modificados con nanopartículas de diamante

    Directory of Open Access Journals (Sweden)

    Luz Amira Torres Medina

    2010-01-01

    Full Text Available La incorporación de nanopartículas de carburos, nitruros, óxidos o diamante en una matriz metálica, generalmente muestran mejoras en la dureza, en la resistencia al desgaste y a la corrosión, comparado con un recubrimiento del metal puro. Estos recubrimientos compuestos se pueden obtener mediante la técnica de electrodeposición, logrando economía y calidad en los depósitos. Los recubrimientos de níquel modificados con nanopartículas de diamante (Ni-D, fueron aplicados sobre un acero AISI SAE 1016 mediante la técnica de electrodeposición desde una solución típica Watts sin aditivos, que contiene nanopartículas de diamante. El efecto que ejercen algunas variables que intervienen en el proceso de electrodeposición como: densidad de corriente, velocidad de agitación y concentración de partículas en el baño, en la dureza y en la resistencia a la corrosión-erosión, se estudiaron mediante un diseño factorial completamente aleatorizado 2k. La resistencia a la corrosión- erosión se evaluó mediante el monitoreo del potencial de corrosión de las probetas con recubrimiento sometidas a un fluido corrosivo y abrasivo en movimiento. Los recubrimientos compuestos de Ni-D obtenidos presentan mejor resistencia a la corrosión-erosión que los recubrimientos de níquel puro. Los recubrimientos más resistentes a la corrosión-erosión fueron los obtenidos a 5 A/dm², 900 rpm y 10 g/L de diamante.

  18. Global usability

    CERN Document Server

    Douglas, Ian

    2011-01-01

    The concept of usability has become an increasingly important consideration in the design of all kinds of technology. As more products are aimed at global markets and developed through internationally distributed teams, usability design needs to be addressed in global terms. Interest in usability as a design issue and specialist area of research and education has developed steadily in North America and Europe since the 1980's. However, it is only over the last ten years that it has emerged as a global concern. Global Usability provides an introduction to the important issues in globalizing des

  19. To share the Knowledge and to get a dialog going. The climatic change; Partager la connaissance et ouvrir le dialogue. Le changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-01-15

    This document aims to inform the public on the climatic change situation and consequences. It presents in a first part the today situation of the global warming and the physical consequences on the environment. The second part is devoted to the consequences on the human activities and the necessary adaptations. The last part discusses the ethical and political aspects, the way of life of the society and wonders on the possible evolutions. (A.L.B.)

  20. Climate change: a reality for the French overseas territories; Le changement climatique: une realite pour l'outre-mer francais

    Energy Technology Data Exchange (ETDEWEB)

    Delcroix, Th.; Cravatte, S. [IRD / Legos, 31 - Toulouse (France)

    2009-05-15

    Warming of the climate system is now unequivocal (see GIEC, 2007). Sea surface temperature and salinity are analyzed for the last decades in the vicinity of French overseas territories, as regional indicators of the related climatic changes. We show a non-homogenous increase in temperature for all territories, as well as a freshening of the waters in the tropical Pacific and an increase of surface salinity in the Atlantic suggesting a drastic modification of the global water cycle. (authors)

  1. Changement climatique dans le vignoble de Champagne : Modélisation thermique à plusieurs échelles spatio-temporelles (1950-2100)

    OpenAIRE

    Briche, Elodie

    2011-01-01

    Global climatic change has already consequences on viticulture worldwide and these modifications imply some questions about future. Evaluation of possible modifications in Champagne vineyard is necessary in terms of thermal extremes for vineyard as spring frost during budbreak and heat-waves. Indeed temperature influences phenological cycle and earlier phenological stages have already been observed. This vineyard is particularly interesting to study because of its northern location and thanks...

  2. Global fordeling

    DEFF Research Database (Denmark)

    Busck, Ole Gunni

    2015-01-01

    Øgede globale økologiske distributionskonflikter i kraft af neoliberal globalisering drevet af kravet om økonomisk vækst......Øgede globale økologiske distributionskonflikter i kraft af neoliberal globalisering drevet af kravet om økonomisk vækst...

  3. Global Uddannelse

    DEFF Research Database (Denmark)

    Jensen, Niels Rosendal

    Antologien handler om "demokratiproblemer i den globale sammenhæng" (del I) og "demokratiproblemer i uddannelse og for de offentligt ansatte" (del II), bundet sammen af et mellemstykke, der rækker ud mod begge poler både det globale og det lokale ved at knytte det til forholdet mellem marked...

  4. Gendering Globalization

    DEFF Research Database (Denmark)

    2009-01-01

    The current global financial situation bluntly and brutally brings home the fact that the global and local are closely connected in times of opportunity as well as crises. The articles in this issue of Asia Insights are about ontra-action between Asia, particularly China, and the Nordic countries...

  5. Senegal's national policy to combat climate change; Politique nationale du Senegal sur la lutte contre les changements climatiques

    Energy Technology Data Exchange (ETDEWEB)

    Dia Toure, F. [Fonds pour l' Environnement Mondial (Senegal). Direction de l' Environnement et des Etablissement Classes

    2007-04-15

    Senegal's participation in the Earth Summit meeting in Rio in 1992 demonstrated its national political stand towards environmental causes. An initiative was taken to educate the population on greenhouse gas (GHG) emissions in relation to different sectors, including the energy sector, transportation, agriculture, forestry and waste management. Later, a group of negotiators followed the works of subsidiary bodies of the Kyoto Agreement. As a non-Annex 1 developing country, Senegal is not required to reduce GHG emissions as are Annex 1 countries. Therefore, Senegal has used judicial tools to benefit from the transfer of clean technologies. The implementation of Senegal's national adaptation action plan has involved global organizations, sectorial studies, public consultations, prioritization and project formulation. The action plan addresses concerns such as water resources, variation in precipitation, drought, agriculture and its vulnerability, and negative impacts due to climate change. The technical solutions include the promotion of agroforestry technologies; crop diversification; water conservation; community wood use; and, prevention of bush fires. Since several geographical regions within Senegal are also affected by global warming, policies are being formulated to protect humid zones and help in the fight against invasive species. Senegal imports much of its energy sources. Households rely on wood and coal for energy. New measures are being adapted and new sustainable technologies are being proposed for fireplaces, better recycling, and better landfill sites. 8 figs.

  6. Estudo comparativo das uniões bráquete-resina-esmalte; bráquete-resina-cobre-alumínio; bráquete-resina-níquel-cromo; bráquete-resina-porcelana, mediante testes de cisalhamento utilizando as resinas enforce e concise

    OpenAIRE

    Nícolas Zaragoza Velásquez

    1998-01-01

    O objetivo deste trabalho foi avaliar a resistência às uniões bráquete-resina-esmalte, bráquete-resina-níquel-cromo, bráquete-resina-cobre-alumínio e bráquete-resina-porcelana utilizando o Sistema Adesivo Universal EnForce e a resina Concise Ortodôntico, através de ensaios de cisalhamento. Para tanto, foram confeccionados corpos de prova nas ligas de níquel-cromo, cobre-alumínio, porcelana, e como grupo controle foram utilizados 20 pré-molares. Estes receberam condicionamento com ácido fosfór...

  7. Evaluación de un método analítico para la determinación de níquel y plomo en sedimento de mar por espectroscopia de absorción atómica

    OpenAIRE

    C. Aragón-Briceño; C. Ponce-Caballero; V. Coronado Peraza; G. Giácoman-Vallejos

    2011-01-01

    En México no existe un método normado para la determinación de metales en sedimentos marinos. Con el propósito de establecer un método preciso para determinar este tipo de contaminantes en sedimento de mar, la presencia de níquel y plomo fue evaluada, en dicho sedimento, a través de espectroscopia de absorción atómica. Como características de referencia fueron utilizados precisión, exactitud, linealidad y los límites de detección y cuantificación. La determinación de plomo y níquel se llevó ...

  8. Global Mindsets

    DEFF Research Database (Denmark)

    Global Mindsets: Exploration and Perspectives seeks to tackle a topic that is relatively new in research and practice, and is considered by many to be critical for firms seeking to conduct global business. It argues that multiple mindsets exist (across and within organizations), that they operate...... it is important for future scholars and managers and how it could be conceptualized. Global Mindsets: Exploration and Perspectives is split into two major sections; the first examines where the literature currently is with respect to the knowledge in the field and what conceptual frameworks guide the thinking......, and should help researchers determine areas of high potential research needs in the future. Given the fluid sense of global mindsets in action, the authors of this book have adopted a flexible and wide-ranging approach. Global Mindsets: Exploration and Perspectives includes conceptual chapters that push...

  9. Taking Action against Global Warming - An Overview of the German Climate Policy; Agir contre le rechauffement de la planete. Une vue d'ensemble de la politique climatique Allemande

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-01

    The climatic change is a reality. The Germany objective is to limit the increase of the earth temperature to 2 degree. The climatology studies show that this represents a limit level to stay in a controlled situation. This paper presents the international and european response to the climatic change and more especially the german approach. It details the revolution of the energy production, the energy efficiency, the problem of the transports and the new energy policy. The legislative framework, the actions of the regions and the financial program are also provided. (A.L.B.)

  10. Changement climatique et viticulture en Champagne : du constat actuel aux prévisions du modèle ARPEGE-Climat sur l’évolution des températures pour le XXIe siècle 

    OpenAIRE

    Gérard Beltrando; Elodie Briche

    2010-01-01

    Dans le vignoble de Champagne, le changement climatique, perceptible depuis la fin des années 1980, se manifeste par une tendance à la précocité des stades phénologiques et par une amélioration de la qualité des raisins vendangés. Mais cette évolution interpelle le milieu professionnel car, si elle se poursuit, elle pourrait devenir néfaste pour la qualité de la production de raisin (chaleur estivale trop importante, taux d’alcool élevé…). Afin d’apporter des éléments de réponse sur l’évoluti...

  11. Climatic change: back to the IIF talk at La Haye; Changements climatiques: retour sur la communication de l'IIF a La Haye

    Energy Technology Data Exchange (ETDEWEB)

    Dupont, J.L.

    2002-07-01

    This document reprints the communication given by F. Billiard, head of the international institute of refrigeration (IIF), at the COP-6 conference of La Haye (November 2000). In his talk, F. Billiard explains the contribution of the refrigeration industry to the global warming which is mainly due to the leaks of refrigerants (CFC, HCFC, HFC) and to the carbon dioxide emissions corresponding to the electric power consumption of refrigerating machineries, air-conditioners and heat pumps. Thus, the abatement of these greenhouse gas emissions requires an improvement of the confinement of the refrigeration equipments and a continuous optimization of their energy efficiency. A second part analyzes the key points of this communication and the choice of some objective appreciation criteria for the remedial actions to be implemented. A glossary completes the document. (J.S.)

  12. 4. national communication to the United Nation framework convention on the climatic change; 4. communication nationale a la convention cadre des Nations Unies sur les changements climatiques

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-07-01

    France, as the other involved participants, has to periodically present its actions in favor of the climatic change fight. This fourth national communication follows a plan defined by the Conference of the Parties to the United Nation Framework Convention on the Climatic Change. This report follows the third national convention published on 2001. It presents in nine chapters the actions realized to reduce and stop the greenhouse effect gases emissions and limit the impacts on the environment and public health: an analytical abstract, the conditions specific to the country, the inventory, the policies and measures, the projections and global effects of the policies and measures, the evaluation of the vulnerability and the climatic changes consequences and the adapted measures, the financial resources and the technology transfer, the research programs, the education formation and awareness of the public. (A.L.B.)

  13. Enzyme activity and microbial biomass in an Oxisol amended with sewage sludge contaminated with nickel Atividade enzimática e biomassa microbiana num Latossolo tratado com lodo de esgoto contaminado com níquel

    Directory of Open Access Journals (Sweden)

    Marcos Donizeti Revoredo

    2007-02-01

    Full Text Available The role of nickel in soils of tropical areas under the application of sewage sludge is still not very well known. This study was carried out under greenhouse conditions in Jaboticabal, São Paulo State, Brazil, with the objective of evaluating the impact of the application of sewage sludge previously contaminated with rates of nickel (329, 502, 746 and 1119 mg kg-1, dry basis on a soil cropped with sorghum, in relation to soil enzyme activity and soil microbial biomass. Soil samples were collected at the beginning and the end of the experiment. The experimental design was completely randomized, with five treatments (control and four rates of Ni in the sewage sludge and four replications. C and N of the soil microbial biomass and enzyme activities (acid and alkaline phosphatases were sensitive indicators for impact evaluation caused by sewage sludge contaminated with nickel. There were positive correlations between "total" and extractable nickel (Mehlich 1 with C-microbial biomass and negative with the microbial C/N relationship. N-microbial biomass correlated positively with "total" and extractable Ni at the last sampling. At the end of the experiment, the acid phosphatase activity correlated negatively with "total" Ni while the alkaline phosphatase correlated with both forms of the metal.O comportamento do níquel em solos de regiões tropicais, principalmente quando adicionado através de lodos de esgoto, ainda é pouco conhecido. O estudo foi conduzido em casa de vegetação, localizada no município de Jaboticabal, Estado de São Paulo, Brasil, com o objetivo de avaliar o impacto da aplicação de lodo de esgoto contaminado com níquel (329, 502, 746 e 1119 mg kg-1, base seca sobre a atividade enzimática e a biomassa microbiana de um solo cultivado com sorgo. As amostras de solo foram coletadas em duas épocas (início e final do experimento. O delineamento utilizado foi o inteiramente casualizado, com cinco tratamentos (testemunha

  14. Global marketing and globalization miths

    OpenAIRE

    2012-01-01

    Global marketing and advertising: understanding cultural paradoxes, de Marieke de Mooij, 3rd ed. Thousand Oaks, CA. Sage Publications, 2010, 322p. Global marketing and advertising: understanding cultural paradoxes, de Marieke de Mooij, 3rd ed. Thousand Oaks, CA. Sage Publications, 2010, 322p.

  15. O Brasil como global player energético? : os desafios da “diplomacia do etanol”

    OpenAIRE

    Faustino, Crístian Veríssimo

    2013-01-01

    Na primeira década do século XXI, a temática energética tem ocupado espaço crescente na agenda internacional. De fato, a garantia de suprimento regular de energia a preços relativamente estáveis continua a suscitar temores e desafios, especialmente com o fim da era do “petróleo barato” e a consequente necessidade de transição para uma economia pós-carbono. Somem-se àqueles os impactos advindos do aquecimento global, de consequências danosas para o clima do planeta. Diante desse cenário, as en...

  16. Global Content in Global Coursebooks

    Directory of Open Access Journals (Sweden)

    Mimoun Melliti

    2013-10-01

    Full Text Available This study aims at exploring the issue of “globality” in global coursebooks as manifested in investing features of connectedness, avoiding inappropriacy, and preserving inclusivity. To do this exploration, two research methods, content analysis and the questionnaire, were adopted. The content of an example of global coursebooks, Headway Intermediate (H/I, in addition to the perception of 251 of its users at Institute Bourguiba for Living Languages (IBLV were investigated. The results obtained revealed that “globality,” in terms of connectedness, inappropriacy, and inclusivity is partial in H/I as learners’ perceptions of it do not map with the content in the coursebook. This study raises questions about the suitability of global coursebooks to globally diverse learners and reveals the necessity of taking measures in the direction of localizing the content of English as a foreign language (EFL coursebooks.

  17. Global Rome

    DEFF Research Database (Denmark)

    Is 21st-century Rome a global city? Is it part of Europe's core or periphery? This volume examines the “real city” beyond Rome's historical center, exploring the diversity and challenges of life in neighborhoods affected by immigration, neoliberalism, formal urban planning, and grassroots social...... movements. The contributors engage with themes of contemporary urban studies–the global city, the self-made city, alternative modernities, capital cities and nations, urban change from below, and sustainability. Global Rome serves as a provocative introduction to the Eternal City and makes an original...

  18. Going Global

    DEFF Research Database (Denmark)

    Harrington, Brooke

    2015-01-01

    This study links theories of relationality and institutional change to deepen understanding of professionals’ role in globalization. In previous institutional research, it has been conventional to treat professionals as agents of firms or transnational organizations, and institutional change...... environment. It also broadens the model of agency to include invention and improvisation by individual professionals, as a counterpart to collective strategic action. The argument is based on data from a 16-nation study exploring the emergence of a particular ‘globalized localism’: the transformation...... to specify a new, more detailed model of the ways local practices and ideas develop into global institutions....

  19. Global Rome

    DEFF Research Database (Denmark)

    Is 21st-century Rome a global city? Is it part of Europe's core or periphery? This volume examines the “real city” beyond Rome's historical center, exploring the diversity and challenges of life in neighborhoods affected by immigration, neoliberalism, formal urban planning, and grassroots social...... movements. The contributors engage with themes of contemporary urban studies–the global city, the self-made city, alternative modernities, capital cities and nations, urban change from below, and sustainability. Global Rome serves as a provocative introduction to the Eternal City and makes an original...

  20. Influência da adição de níquel na síntese do SrSnO3 Influence of nickel doping on the SrSnO3 synthesis

    Directory of Open Access Journals (Sweden)

    M. R. Nascimento

    2008-03-01

    Full Text Available Pós cerâmicos microestruturados de Sr1-xNi xSnO3 (x de 0 a 0,20 foram sintetizados com sucesso pelo método dos precursores poliméricos. Os precursores foram caracterizados por análise térmica. Três etapas de decomposição foram observadas: a primeira relacionada com o processo de desidratação, a segunda e a terceira são processos de combustão da matéria orgânica. A caracterização estrutural foi feita por difração de raios X, espectrofotometria de absorção óptica no infravermelho e espectroscopia Raman após calcinação a 700 ºC, indicando a presença da fase SrSnO3 ortorrômbica. Quando níquel II foi adicionado na rede cristalina do estanato, foi observada uma transição de fase, conduzindo a uma nova estrutura pseudo-cúbica. Com base nos resultados de Raman e difração de raios X, foi analisada a ordem-desordem a curto e longo alcance. Os resultados experimentais mostram a formação de fases secundárias quando níquel II é adicionado na matriz, com calcinação a 700 ºC.Sr1-xNi xSnO3 (x from 0 to 0.20 powders were synthesized by the polymeric precursor method. The powder precursors were characterized by thermal analysis. Three decomposition steps were observed: the first step related to the dehydration process, the second and third ones assigned to combustion processes. The structural characterization was done by X-ray diffraction (XRD, infrared absorption spectroscopy and Raman spectroscopy after calcination at 700 °C, indicating the presence of orthorhombic SrSnO3. When nickel is added to the structure, a phase transition is observed, leading to the presence of a pseudo-cubic phase. Based on Raman and XRD results, the order-disorder at short and long range were analyzed. The experimental results show the formation of a secondary phase when nickel is added to the material and calcined at 700 ºC.

  1. Análisis de las tensiones internas en las cascaras de níquel electroconformadas que se utilizan como inserto de un molde de inyección de termoplásticos (rapid tooling

    Directory of Open Access Journals (Sweden)

    Monzón, M. D.

    2005-02-01

    Full Text Available This study deals with a research field started at the LFI (Laboratorio de Fabricación Integrada of the ULPGC (Universidad de Las Palmas de Gran Canaria. Its aim is to analyse and propose improvements in the electroformed nickel cores manufacture. The main application of these cores is to be used as plastic injection molds. It has been considered an important part of this study taking under consideration internal stresses that appear in the nickel electroformed core. These stresses play a determinant role towards reaching a dimensional and resistant quality standard of the shells, which will be later transformed into cores. The investigation includes not only a theoretic study but also an experimental one. The testing method has the remarkable advantage of a wide industrial application because of its simplicity, low cost and reproducibility of the electrolytic bath actual conditions.

    El presente trabajo forma parte de una línea de investigación iniciada en el Laboratorio de Fabricación Integrada de la Universidad de Las Palmas de Gran Canaria, en el que se analizan y proponen mejoras en la fabricación de insertos de níquel electroconformado, cuya aplicación principal será la de moldes de inyección de plásticos. Dentro de este estudio, se ha considerado de especial interés determinar el valor de las tensiones internas que aparecen en los depósitos de níquel electroconformados sobre el modelo; dichas tensiones van a ser determinantes para la calidad dimensional y resistente de las cascaras que luego serán transformadas en insertos. El estudio combina un análisis teórico con otro experimental. El método de ensayo utilizado presenta la ventaja de una gran aplicación industrial por su sencillez, bajo coste y reproducibilidad de las condiciones reales del baño electrolítico.

  2. Síntese, por reação de combustão em forno de microondas, de nanoferritas de níquel dopadas com cromo Synthesis of nickel nanoferrites doped with chromium by microwave assisted combustion reaction

    Directory of Open Access Journals (Sweden)

    A. C. F. M. Costa

    2009-03-01

    Full Text Available Pós nanométricos de ferritas de níquel dopadas com cromo foram sintetizados por reação de combustão em forno de microondas. A influência da concentração de Cr3+ nas proporções de x = 0; 0,5 e 1 no sistema NiCr xFe2-xO4 foi investigada. Os pós foram preparados de acordo com o conceito da química dos propelentes e aquecidos em forno microondas com potência 980 W. Os pós sintetizados foram caracterizados por difratometria de raios X, adsorção de nitrogênio (método BET, microscopia eletrônica de varredura, picnometria de hélio e medidas magnéticas. Os resultados mostraram que foi possível obter nanopós de ferritas de níquel dopadas com cromo e que a elevação da concentração de cromo causou um aumento no tamanho de partículas (15 nm para 55 nm e redução nos parâmetros magnéticos.Chromium-doped nickel nanoferrite powder was prepared by combustion reaction, using microwave energy as the external heating source, and the influence of the Cr3+concentration on the NiCr xFe2-xO4 system was investigated. The powder, which was prepared according to the concept of propellant chemistry, was heated in a microwave oven under a power of 980 W. The resulting material was characterized by XRD, BET, SEM, helium picnometry and magnetic measurements. The results indicate that it was possible to obtain chromium-doped nickel ferrite nanopowders and that raising the chromium concentration caused an increase in particle size (from 15 nm to 55 nm, and a reduction in the magnetic parameters.

  3. Global Mindset

    DEFF Research Database (Denmark)

    Sørensen, Olav Jull

    2016-01-01

    The concept of Global Mindset (GM) – the way to think about the global reality – is on the agenda of multinational companies concomitant with the increase in global complexity, uncertainty and diversity. In spite of a number of studies, the concept is still fluid and far from a managerial...... way of thinking about the global business reality. The other extreme is a GM as an organizational capability and process with a GM in a continuous state of becoming – and thus in a continuously alignment with a dynamic context. In addition, we argue for what we call “situational capabilities”, i.......e. the capability to sense (quickly), reflect (constructively) and act purposefully (for mutual benefit). A case on an MNC is used at the end to show the organizational manifestations of a GM....

  4. Global Derivatives

    DEFF Research Database (Denmark)

    Andersen, Torben Juul

    ." - Steen Parsholt, Chairman and CEO, Aon Nordic Region. "Andersen has done a wonderful job of developing a comprehensive text that deals with risk management in global markets. I would recommend this book to any student or businessman who has a need to better understand the risks and risk management...... management practice. Of particular note is the global and integrated approach chosen in this book which should be of special interest to aspiring managers active in global and international markets." - Dr Jean-Pierre Zigrand, Lecturer in Finance, London School of Economics, UK. More than 90 per cent...... management situations. Its key features include: derivatives are introduced in a global market perspective; describes major derivative pricing models for practical use, extending these principles to valuation of real options; practical applications of derivative instruments are richly illustrated...

  5. Global Managers

    DEFF Research Database (Denmark)

    Barakat, Livia L.; Lorenz, Melanie P.; Ramsey, Jase R.

    2016-01-01

    urpose: – The purpose of this paper is to examine the effect of cultural intelligence (CQ) on the job performance of global managers. Design/methodology/approach: – In total, 332 global managers were surveyed from multinational companies operating in Brazil. The mediating effect of job satisfaction...... was tested on the CQ-job performance relationship. Findings: – The findings suggest that job satisfaction transmits the effect of CQ to job performance, such that global managers high in CQ exhibit more job satisfaction in an international setting, and therefore perform better at their jobs. Practical...... implications: – Results imply that global managers should increase their CQ in order to improve their job satisfaction and ultimately perform better in an international context. Originality/value: – The authors make three primary contributions to the international business literature. First, the authors...

  6. Gendered Globalization

    DEFF Research Database (Denmark)

    Milwertz, Cecilia Nathansen; Cai, Yiping

    2017-01-01

    Both the People’s Republic of China (PRC) and Nordic countries (Sweden, Iceland, Denmark, Norway and Finland) view gender equality as a social justice issue and are politically committed towards achieving gender equality nationally and internationally. Since China has taken a proactive position o...... on globalization and global governance, gender equality is possibly an area that China may wish to explore in collaboration with the Nordic countries....

  7. Global Managers

    DEFF Research Database (Denmark)

    Barakat, Livia L.; Lorenz, Melanie P.; Ramsey, Jase R.

    2016-01-01

    Purpose: – The purpose of this paper is to examine the effect of cultural intelligence (CQ) on the job performance of global managers. Design/methodology/approach: – In total, 332 global managers were surveyed from multinational companies operating in Brazil. The mediating effect of job satisfact...... behavior literature, it is not often explicitly associated with global managers that are working in cross-cultural settings. Finally, the authors posit that job satisfaction mediates the relationship between CQ and job performance.......Purpose: – The purpose of this paper is to examine the effect of cultural intelligence (CQ) on the job performance of global managers. Design/methodology/approach: – In total, 332 global managers were surveyed from multinational companies operating in Brazil. The mediating effect of job...... satisfaction was tested on the CQ-job performance relationship. Findings: – The findings suggest that job satisfaction transmits the effect of CQ to job performance, such that global managers high in CQ exhibit more job satisfaction in an international setting, and therefore perform better at their jobs...

  8. Global warming

    CERN Document Server

    Hulme, M

    1998-01-01

    Global warming-like deforestation, the ozone hole and the loss of species- has become one of the late 20the century icons of global environmental damage. The threat, is not the reality, of such a global climate change has motivated governments. businesses and environmental organisations, to take serious action ot try and achieve serious control of the future climate. This culminated last December in Kyoto in the agreement for legally-binding climate protocol. In this series of three lectures I will provide a perspective on the phenomenon of global warming that accepts the scientific basis for our concern, but one that also recognises the dynamic interaction between climate and society that has always exited The future will be no different. The challenge of global warning is not to pretend it is not happening (as with some pressure groups), nor to pretend it threatens global civilisation (as with other pressure groups), and it is not even a challenge to try and stop it from happening-we are too far down the ro...

  9. Development of a climate change adaptation plan : guide for Quebec municipalities; Elaborer un plan d'adaptation aux changements climatiques : guide destine au milieu municipal quebecois

    Energy Technology Data Exchange (ETDEWEB)

    Larrivee, C. (comp.) [Ouranos, Montreal, PQ (Canada); Moffet, V.; Robitaille, P. [Quebec Ministere du Developpement durable, de l' Environnement et des Parcs, Quebec, PQ (Canada); Blais, P.; Marceau, M.; Dupuis, C. [Quebec Ministere des Affaires municipales, des Regions et de l' Occupation du territoire, Quebec, PQ (Canada); Desjarlais, C.; Bourque, A. [Ouranos, Montreal, PQ (Canada)

    2010-01-15

    This article presented Quebec's strategies for developing a climate change action plan in response to increasing greenhouse gas emissions and to minimize environmental impacts. In addition to a rise in average temperature, the increase of greenhouse gas emissions will affect many other climate variables such as precipitation and wind. The impacts may vary widely between regions and municipalities, but all will have to deal with the changes in the natural environment, populations and socio-economic activities within municipalities. The adaptation plan must also consider non-climate factors such as infrastructure and socio demographic characteristics of a municipality in order to determine risks by order of priority and to develop an action plan if needed. In addition to educating the population, the strategies involve obtaining a clear mandate from each municipal council to form a multidisciplinary group, name a coordinator who will have a global vision of the plan and propose a deadline. Implementing an adaptation plan involves the following 5 steps: (1) evaluating the present impact of the climate, (2) defining the potential impacts of climate changes and analyzing its vulnerabilities, (3) recognizing the risks, (4) prioritizing options to manage the recognized risks, and (5) developing and implementing an adaptation plan. This plan will determine the criteria to measure the performance, evaluate and amend its outcome periodically if necessary. 19 refs., 9 tabs., 12 figs.

  10. LES CHANGEMENTS CLIMATIQUES ENTRE REALITE ET LEURRE : LEURS REPRESENTATIONS SOCIALES AUPRES DES ACTEURS TOURISTIQUES EN STATION DE SPORTS D’HIVER

    Directory of Open Access Journals (Sweden)

    MIHAELA MARC

    2013-04-01

    Full Text Available A great number of authors modeled the phenomenon of anthropogenic global warming yet few of them identified society’s reaction to those models. This paper identifies the social representations of climate change among territorialized tourism actors in the Eastern Pyrenees ski resorts. Analyzing the links between climate change and the ski industry is highly relevant as natural snow is considerably sensitive to climate change. The case study concerns the region of Cerdagne-Capcir located in the French département of Pyrénées-Orientales. For two consecutive winter seasons, 2007/2008 and 2008/2009, we carried out a survey among skiers, local tourism decision-makers, administratives and tourism professionals in nine ski resorts. A questionnaire was distributed to skiers while a face-to-face interview was conducted with the other tourism actors cited above. The quantitative data regarding the skiers’ social representations was analyzed thru the prototypical and categorical analysis, a method developed by P. Verges, a French social psychologist. The qualitative data resulting from the face-to-face interviews led to the identification of seven categories of attitudes towards climate change in the decision-making process: immutability, irealistic optimism, technocracy, scepticism, belief in a conspiracy theory, realism and catastrophism. Climate change social representations differ at the level of both the skiers’ nationalities (French / Spanish and the tourism actors categories (offer – local decision-makers, administratives and tourism professionals / demand – the skiers.

  11. Climate change and health in the United States of America: impacts, adaptations, and research; Changement climatique et santeaux Etats-Unis: impacts, adaptations et recherche

    Energy Technology Data Exchange (ETDEWEB)

    Jouan, R.; Magaud, M

    2009-11-15

    After a description of the various impacts of climate change on human health, this report describes and comments the impacts of climate change on health in the USA: impacts of heat waves, of air quality degradation, of extreme climate events, of climate change on infectious diseases and allergies, regional impacts of climate change. In a second part, it describes the strategies of adaptation to the 'climate change and health' issue in the USA: mitigation and adaptation to climate change, adaptation challenges, insufficiently prepared public health system, adaptation to heat waves, adaptation to air quality degradation, adaptation to extreme climate events, adaptation to food- and water-based diseases and to vector-based diseases, examples of proactive adaptation. The last part describes the organisation of research on 'climate change and health' in the USA: nowadays and in the future, role of federal agencies, priority research axes. The 'United States Global Change Research Program' is presented in appendix, as well as the most important research centres (mostly in universities)

  12. Impacts du changement climatique sur l'hydrologie et la gestion des ressources en eau du bassin de la Meuse (synthèse bibliographique

    Directory of Open Access Journals (Sweden)

    Bauwens, A.

    2013-01-01

    Full Text Available Impacts of climate change on hydrological regimes and water resources management in the Meuse catchment. A review. This review examines the consequences of climate change on the hydrology of the Meuse catchment and on various water-related socio-economic sectors. It sums up the different modeling approaches in hydrological modeling, placing emphasis on current modeling assumptions and the restrictions inherent within them. It is useful to consider land use evolution and adapted management within the context of climate change, particularly with reference to agriculture. More specifically, a broader usage of physically-based hydrological models would be useful in order to represent climate change scenarios and possible adaptation tracks at the catchment scale. These physically-based hydrological models are able to represent a wide range of phenomena occurring in the water-soil-plant continuum. They thus allow a refinement of global hydrological solutions at the catchment scale, especially during low flow periods. Moreover, such models pave the way for the analysis of scenarios aimed at creating adaptation in the use and management of soils.

  13. Green Growth - an Illusion? Energy and Climate Risk: Rethinking our Developmental Models; La croissance verte, une illusion? Energie et risque climatique: repenser nos modeles de developpement

    Energy Technology Data Exchange (ETDEWEB)

    Dessus, B. [Association Global Chance, 92 - Meudon (France)

    2011-04-15

    The years go by and international conferences come and go, with their quota of cries of alarm and calls to action to counter climate change. But in reality few large-scale programmes have been launched anywhere in the world involving concrete action to bring down greenhouse gas emissions. As one who has campaigned for many years for policies of energy consumption control, Benjamin Dessus shows here that the energy challenge is as great as it has ever been in a world of expanding populations in which most peoples aspire to reach the developmental level of the northern countries, despite the fact that our climate probably cannot support such a state of affairs. He argues here against a certain number of common suppositions, such as the idea of focussing exclusively on CO{sub 2} in the fight against global warming, the need for a continuous economic growth on the order of 2% per annum or excessive faith in market mechanisms to bring down greenhouse gas emissions. He also stresses the ambiguities of so-called 'green' growth and compares different energy conservation scenarios. In this way, he shows that, against a relatively dominant line of reasoning based largely on (at times near-utopian) technological solutions and the continuation of sustained economic growth, there are more effective paths based on individual/collective energy sobriety and a serious slowdown of economic growth in the most developed countries, if not indeed a total halt to that growth (though these are more ambitious in that they require a revolution in the behaviour of the most affluent peoples). He concludes by proposing some courses of action for implementing such a programme in a country like France, showing the extent to which modern modes of life are going to have to change and how urgent it now is to debate these matters, if such change is to be achieved without - excessive - pain. (author)

  14. La calidad de la información en el proceso de automatización de la minería del níquel en Cuba

    Directory of Open Access Journals (Sweden)

    Juana M. Laborde-Chacón

    2003-03-01

    Full Text Available Enfocado hacia la automatización, se analizan los aspectos cualitativos que definen la calidad de la información utilizada en las actividades de la minería cubana del níquel, y se destacan en primer lugar los criterios para la clasificación de esta información, así como los elementos por considerar a fin de definir el formato, organización y herramientas para la manipulación de la misma. En segundo lugar, son valorados los aspectos básicos que garantizan la fiabilidad de la información y la capacidad del personal técnico, geólogo y minero, para relacionarse con la información en computadoras; se argumenta la necesidad de crear en cada mina un Grupo de Gestión de Datos y de Informatización. Finalmente, se definen los conceptos de Información Disponible, Información Visible e Información Oculta, a la vez que se plantean las formas más comunes de acceso a la información y la protección de la misma.

  15. Sobre la solución del modelo matemático del proceso de calcinación del carbonato básico de níquel (CBN

    Directory of Open Access Journals (Sweden)

    José A. Fajardo-Suárez

    2004-03-01

    Full Text Available Se presentan resultados acerca de la solución del modelo matemático del proceso de calcinación del carbonato básico de níquel en el horno tubular rotatorio. Se expone el algoritmo, obtenido a partir de la aplicación del método de la rejilla, para la solución de las ecuaciones diferenciales en derivadas parciales que conforman el modelo matemático. La clasificación de las ecuaciones en parabólicas e hiperbólicas permite la selección del esquema tripuntual para la solución de las ecuaciones de primer orden y el esquema simétrico de seis puntos para las de segundo orden. La aplicación de los correspondientes operadores en diferencias conduce a la obtención del sistema de ecuaciones en diferencias, vinculadas entre sí mediante la matriz interferencia, la cual lleva implícita la realidad física de intercambio que ocurre en el horno, y refleja la interconexión térmica y la influencia sobre el proceso de algunos factores tales como la temperatura del medio, potencia calorífica del combustible, etc., así como la influencia de la temperatura del carbonato sobre la velocidad de las reacciones en las diferentes zonas tecnológicas.

  16. Global Programs

    Science.gov (United States)

    Lindberg Christensen, Lars; Russo, P.

    2009-05-01

    IYA2009 is a global collaboration between almost 140 nations and more than 50 international organisations sharing the same vision. Besides the common brand, mission, vision and goals, IAU established eleven cornerstones programmes to support the different IYA2009 stakeholder to organize events, activities under a common umbrella. These are global activities centred on specific themes and are aligned with IYA2009's main goals. Whether it is the support and promotion of women in astronomy, the preservation of dark-sky sites around the world or educating and explaining the workings of the Universe to millions, the eleven Cornerstones are key elements in the success of IYA2009. However, the process of implementing global projects across cultural boundaries is challenging and needs central coordination to preserve the pre-established goals. During this talk we will examine the ups and downs of coordinating such a project and present an overview of the principal achievements for the Cornerstones so far.

  17. Global Inequality

    DEFF Research Database (Denmark)

    Niño-Zarazúa, Miguel; Roope, Laurence; Tarp, Finn

    2016-01-01

    This paper measures trends in global interpersonal inequality during 1975–2010 using data from the most recent version of the World Income Inequality Database (WIID). The picture that emerges using ‘absolute,’ and even ‘centrist’ measures of inequality, is very different from the results obtained...... using standard ‘relative’ inequality measures such as the Gini coefficient or Coefficient of Variation. Relative global inequality has declined substantially over the decades. In contrast, ‘absolute’ inequality, as captured by the Standard Deviation and Absolute Gini, has increased considerably...... and unabated. Like these ‘absolute’ measures, our ‘centrist’ inequality indicators, the Krtscha measure and an intermediate Gini, also register a pronounced increase in global inequality, albeit, in the case of the latter, with a decline during 2005 to 2010. A critical question posed by our findings is whether...

  18. Another globalization

    Directory of Open Access Journals (Sweden)

    Prof. Ph.D. Ion Bucur

    2007-05-01

    Full Text Available Finding the anachronisms and the failures of the present globalization, as well as the vitiated system of world-wide government, has stimulated the debates regarding the identification of a more equitable form of globalization to favor the acceleration of the economic increase and the reduction of poverty.The deficiency of the present international economic institutions, especially the lack of transparency and democratic responsibility, claims back with acuteness the reformation of the architecture of the international institutional system and the promotion of those economical policies which must ensure the stability world-wide economy and the amelioration of the international equity.

  19. Conceived globals

    DEFF Research Database (Denmark)

    Cheraghi, Maryam; Schøtt, Thomas

    2016-01-01

    A firm may be conceived global, in the sense that, before its birth, the founding entrepreneur has a transnational network of advisors which provides an embedding for organising the upstart that may include assembling resources and marketing abroad. The purpose is to account for the entrepreneurs...... the intending, starting and operating phases, fairly constantly with only small fluctuations. The firm is conceived global in terms of the entrepreneur's transnational networking already in the pre-birth phase, when the entrepreneur is intending to start the firm. These phase effects hardly depend on attributes...

  20. Going global?

    DEFF Research Database (Denmark)

    Fejerskov, Adam Moe; Rasmussen, Christel

    2016-01-01

    During the past decade, academic attention to the role of private foundations in international development cooperation has greatly intensified. The largest foundations have increased their global giving and moved towards strategic social impact, but we do not know if such processes have also...... occurred at a more micro level. This article explores this issue by studying the international activities of Danish foundations. It finds that grant-making on global issues is increasing, and that several foundations have undergone transformations in their approach to grantmaking, making them surprisingly...

  1. Glaciers et évolution climatique dans les Andes boliviennes. Glacier de Zongo et glacier de Chacaltaya Cordillère Royale, 16°S

    Directory of Open Access Journals (Sweden)

    1995-01-01

    THE ANDES OF BOLIVIA ZONGO AND CHACALTAYA GLACIERS - REAL CORDILLERA, 16˚ S. The high sensibility and the short lag time response of glaciers to climatic changing make it possible to use them for analyzing the variability and the evolution of climate in the Tropics. Measurements of mass balance and hydrological balance were performed every month on the two glaciers. Methods are presented. Results obtained during the three hydrological years 1991-1994 have shown great variability. This variability is controlled mainly by the extension of the precipitation period in the warm season which extends over six months. ENSO (El Niño Southern Oscillation events are associated with quite negative mass balance, as shown both by the response of glaciers to the last 1991-1992 event and by the mass balance reconstruction from hydrological data for the two last decades. The glacier retreat is increasing dramatically since the 1980's in the Central Andes due to a succession of ENSO events and the forces of global warming. GLACIERS AND CLIMATIC EVOLUTION IN THE ANDES OF BOLIVIA ZONGO AND CHACALTAYA GLACIERS - REAL CORDILLERA, 16˚ S. The high sensibility and the short lag time response of glaciers to climatic changing make it possible to use them for analyzing the variability and the evolution of climate in the Tropics. Measurements of mass balance and hydrological balance were performed every month on the two glaciers. Methods are presented. Results obtained during the three hydrological years 1991-1994 have shown great variability. This variability is controlled mainly by the extension of the precipitation period in the warm season which extends over six months. ENSO (El Niño Southern Oscillation events are associated with quite negative mass balance, as shown both by the response of glaciers to the last 1991-1992 event and by the mass balance reconstruction from hydrological data for the two last decades. The glacier retreat is increasing dramatically since the 1980's in

  2. De l’urgente nécessité de réformer la gouvernance globale Reframing Global Governance : Apocalypse Soon or Reform !

    Directory of Open Access Journals (Sweden)

    David Held

    2011-03-01

    Full Text Available Le réchauffement climatique, la pauvreté ou la menace d’une catastrophe nucléaire comptent parmi les défis majeurs auxquels l’humanité se doit de faire face collectivement en ce début de 21e siècle. Malgré la gravité et l’urgence de la situation, les moyens dont nous disposons pour résoudre de tels problèmes demeurent limités et incomplets. Il est dès lors non seulement essentiel mais aussi urgent de penser comment faire face à de tels enjeux globaux. Les solutions passent par des mécanismes de gouvernance globale et se doivent de répondre aux exigences de solidarité, de démocratie, de justice sociale et d’efficacité politique. Il s’agit notamment d’assurer à chaque personne la possibilité d’influencer les conditions sociales qui façonnent sa vie. Il est donc encore possible d’agir sur le cours des choses, mais si aucune réponse n’est rapidement apportée à ces défis majeurs, le futur de l’humanité risque d’être compromis.Global warming, poverty and the threat of nuclear catastrophe are among the major challenges humanity has to face collectively in this early 21st century. In spite of the seriousness and the urgency of the situation, the means at our disposal to solve such problems remain limited and incomplete. It is therefore not only essential but also urgent to think about how to face these growing global challenges. It requires new mechanisms of global governance and taking steps toward solidarity, democracy, justice and policy effectiveness. Among these key issues is the need to ensure the possibility for each person to influence the social conditions that shape his or her life. Thus, there is still hope that the vital task of reframing global governance may be pursued with an increasing sense of urgency. If this does not happen, the very future of humanity is at risk.

  3. Impact des changements climatiques sur les écosystèmes alpins : comment les mettre en évidence et les prévoir ?

    Directory of Open Access Journals (Sweden)

    Nigel G. Yoccoz

    2011-01-01

    Full Text Available Les écosystèmes alpins vont être grandement influencés par les changements climatiques à venir, mais d’autres facteurs, tels que l’utilisation des terres ou les espèces invasives, pourront aussi jouer un rôle important. Le climat peut influencer les écosystèmes à différents niveaux, et nous en décrivons certains, en mettant l’accent sur les méthodes utilisées et les données disponibles. Le climat peut d’abord modifier la phénologie des espèces, comme la date de floraison des plantes ou la date d’éclosion des insectes. Il peut ensuite affecter directement la démographie des espèces (survie, reproduction, dispersion et donc à terme leur répartition. Il peut enfin agir sur les interactions entre espèces – le couvert neigeux par exemple modifie le succès de certains prédateurs. Une caractéristique des écosystèmes alpins est la présence d’un manteau neigeux important et pourtant l’influence de la neige reste relativement mal connue, en particulier pour des raisons logistiques. Même si nous avons fait des progrès importants dans le développement de modèles prédictifs, surtout pour ce qui est de la répartition des plantes alpines, il reste à mettre en place des réseaux d’observations et d’expériences permettant de mieux tenir compte de la variabilité des écosystèmes alpins et des interactions avec le climat.Alpine ecosystems will be greatly impacted by climatic change, but other factors, such as land use and invasive species, are likely to play an important role too. Climate can influence ecosystems at several levels. We describe some of them, stressing methodological approaches and available data. Climate can modify species phenology, such as flowering date of plants and hatching date in insects. It can also change directly population demography (survival, reproduction, dispersal, and therefore species distribution. Finally it can effect interactions among species –snow cover for example

  4. Speaking globally

    NARCIS (Netherlands)

    van der Linden, M.

    2009-01-01

    The recent growth of the working classes in various parts of the Global South (or what was called the Tricontinent of Africa, Asia, and Latin America some years ago) has important consequences for labor historians. For a very long time labor history was mainly based in the North Atlantic region,

  5. Global Sourcing

    NARCIS (Netherlands)

    M.J. Mol; R.J.M. van Tulder (Rob); P.R. Beije (Paul)

    2002-01-01

    textabstractSince the early 1990s international - or even global - outsourcing of intermediate products from suppliers has been propagated as a key means to improve the performance of firms. It is argued that becoming more lean and internationally focused is beneficial for the buyer as

  6. Global glance

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Molycorp Announces Successful Close of Neo Materials Acquisition Molycorp, Inc. announced on 11 June 2012 that its acquisition of Canadian-based Neo Material Technologies Inc. has officially closed, creating a global rare earth leader with a combination of a world-class rare earth resource, ultra-high-purity rare earth processing capabilities, and full 'mine-to-magnetics' vertical integration.

  7. Justice Globalism

    NARCIS (Netherlands)

    Wilson, Erin; Steger, Manfred; Siracusa, Joseph; Battersby, Paul

    2014-01-01

    The pursuit of a global order founded on universal rules extends beyond economics into the normative spheres of law, politics and justice. Justice globalists claim universal principles applicable to all societies irrespective of religion or ideology. This view privileges human rights, democracy and

  8. Global overeksponering

    DEFF Research Database (Denmark)

    Rosenstand, Claus A. Foss

    2007-01-01

    - idet min lillebror er blandt de anholdte; og mine forældre derfor skulle være blandt de skyldige. Hvilket har fået mig til at fare i blækhuset, med en alternativ forklaringsmodel, der ikke handler om skyld. Kulturen omkring Ungdomshuset er globalt orienteret, og derfor meget sensible overfor global...... forandringer. Den globale orientering kommer blandt andet til udtryk i det relativt store internationale netværk, som bakker de unge op i deres protester - enten ved tilstedeværelse i København eller andre sympatiaktioner. Siden den 11. september, 2001, er globale realiteter blevet eksponeret i massemedierne...... også sig selv og sin omverden igennem en global optik. Ungdommen af i dag er som børn vokset op i et samfund og dannelseskultur, der ikke har været globalt orienteret, hvor demokratiske værdier som frihed, lighed, menneskerettigheder her hersket i det socialdemokratiske projekt om sammenhængskraft. Og...

  9. Global Games

    NARCIS (Netherlands)

    van Bottenburg, Maarten

    2001-01-01

    Why is soccer the sport of choice in South America, while baseball has soared to popularity in the Carribean? How did cricket become India's national sport, while China is a stronghold of table tennis? In Global Games, Maarten van Bottenburg asserts that it is the 'hidden competition' of social and

  10. Justice Globalism

    NARCIS (Netherlands)

    Wilson, Erin; Steger, Manfred; Siracusa, Joseph; Battersby, Paul

    2014-01-01

    The pursuit of a global order founded on universal rules extends beyond economics into the normative spheres of law, politics and justice. Justice globalists claim universal principles applicable to all societies irrespective of religion or ideology. This view privileges human rights, democracy and

  11. Globalizing America

    DEFF Research Database (Denmark)

    Brewer, Thomas L.; Boyd, Gavin

    An argument that globalization is an ungoverned integration process in which US firms are agents of structural change. It describes the benefits and costs (for example, generating pressure for protection of US home markets), and reviews the expansion of interdependencies between the US and others....

  12. Global overeksponering

    DEFF Research Database (Denmark)

    Rosenstand, Claus A. Foss

    2007-01-01

    - idet min lillebror er blandt de anholdte; og mine forældre derfor skulle være blandt de skyldige. Hvilket har fået mig til at fare i blækhuset, med en alternativ forklaringsmodel, der ikke handler om skyld. Kulturen omkring Ungdomshuset er globalt orienteret, og derfor meget sensible overfor global...... forandringer. Den globale orientering kommer blandt andet til udtryk i det relativt store internationale netværk, som bakker de unge op i deres protester - enten ved tilstedeværelse i København eller andre sympatiaktioner. Siden den 11. september, 2001, er globale realiteter blevet eksponeret i massemedierne...... også sig selv og sin omverden igennem en global optik. Ungdommen af i dag er som børn vokset op i et samfund og dannelseskultur, der ikke har været globalt orienteret, hvor demokratiske værdier som frihed, lighed, menneskerettigheder her hersket i det socialdemokratiske projekt om sammenhængskraft. Og...

  13. Global militarization

    Energy Technology Data Exchange (ETDEWEB)

    Wallensteen, P.; Galtung, J.; Portales, C.

    1985-01-01

    This book contains 10 chapters. Some of the titles are: Military Formations and Social Formations: A Structural Analysis; Global Conflict Formations: Present Developments and Future Directions; War and the Power of Warmakers in Western Europe and Elsewhere, 1600-1980; and The Urban Type of Society and International War.

  14. Global Games

    NARCIS (Netherlands)

    van Bottenburg, Maarten

    2001-01-01

    Why is soccer the sport of choice in South America, while baseball has soared to popularity in the Carribean? How did cricket become India's national sport, while China is a stronghold of table tennis? In Global Games, Maarten van Bottenburg asserts that it is the 'hidden competition' of social and

  15. Global Europa

    DEFF Research Database (Denmark)

    Manners, Ian

    2010-01-01

    The mythology of the European Union (EU) in world politics can be told and untold in many different ways. This article focuses on the lore or stories of who did what to whom, the ideological projection of the past onto the present and the escapist pleasure of story telling in looking at the mytho......The mythology of the European Union (EU) in world politics can be told and untold in many different ways. This article focuses on the lore or stories of who did what to whom, the ideological projection of the past onto the present and the escapist pleasure of story telling in looking...... at the mythology of ‘global Europa' - the EU in the world. It concludes with a reflection on the way in which the many diverse myths of global Europa compete for daily attention, whether as lore, ideology, or pleasure. In this respect the mythology of global Europa is part of our everyday existence, part of the EU...

  16. Quel type d’aide dans un monde où les pauvres vivent dans les pays émergents ?

    Directory of Open Access Journals (Sweden)

    Gilles Carbonnier

    2012-04-01

    Full Text Available Cette édition de la Revue internationale de politique de développement analyse les bouleversements qui affectent l’aide au développement, notamment eu égard aux politiques publiques globales et aux pays émergents. Dans cet article introductif, les auteurs examinent les mutations du contexte et de la géographie de la pauvreté dans le monde pour aborder le rôle des agences d’aide dans les pays à revenu intermédiaire (PRI. Ils examinent deux motifs qui plaident pour la poursuite de l’engagement des donateurs dans ces pays. Premièrement, il est dans l’intérêt des pays à faible revenu de voir les donateurs traditionnels et les PRI collaborer à la conception et la mise en œuvre de politiques globales pour protéger les biens publics mondiaux. Deuxièmement, les agences de coopération peuvent contribuer à réduire la pauvreté dans les PRI, nonobstant la nature hautement politique et délicate d’un tel engagement parallèle à l’émergence des classes moyennes et des organisations de la société civile dans les PRI. En conclusion, la cohérence des politiques publiques en faveur du développement durable peut servir de référence commune aux pays industrialisés comme aux PRI pour faire avancer l’agenda de la lutte contre la pauvreté avec celui de la préservation des biens publics mondiaux.

  17. Aspectos metalúrgicos de revestimentos dissimilares com a superliga à base de níquel inconel 625 Metallurgical aspects of dissimilar weld overlays of inconel 625 nickel based superalloys

    Directory of Open Access Journals (Sweden)

    Cleiton Carvalho Silva

    2012-09-01

    Full Text Available Prolongar a vida útil e aumentar a confiabilidade de equipamentos e tubulações de plantas de produção e processamento de petróleo é uma busca constante no setor de petróleo e gás. Tais aspectos dependem essencialmente do uso de ligas resistentes à corrosão. Neste contexto, a soldagem de revestimento com superligas à base de níquel tem sido uma alternativa interessante, pois confere aos equipamentos uma alta resistência à corrosão com um custo inferior, se comparado à fabricação de componentes ou tubulações maciças com superligas. Assim, o objetivo do presente trabalho foi investigar o comportamento metalúrgico de revestimento de superliga à base de níquel do tipo Inconel 625 depositados pelo processo TIG com alimentação de arame frio. As soldagens foram realizadas em uma bancada robotizada, empregando uma fonte eletrônica de soldagem com sistema de aquisição de dados para o monitoramento dos sinais de corrente e tensão. A caracterização microestrutural foi realizada através das técnicas de microscopia eletrônica de varredura (MEV e transmissão (MET, espectroscopia de energia dispersiva de raios-X (EDS. Os resultados mostraram que a microestrutura do metal de solda foi constituída por uma matriz γ com fases secundárias ricas em Nb. Foi encontrada a formação de precipitados complexos de carbonetos/nitretos de Ti e Nb.To extend the life and reliability of pipes and equipment in oil & gas production and processing settings is a continuous demand. These aspects are essentially dependent on corrosion resistant alloys used. In this context, the weld overlay with Ni-based superalloys is a great interesting alternative, since improve the corrosion resistance without increase the cost of manufacture when compared to massive equipment. Thus, the objective of this study was to evaluate the metallurgical aspects of Inconel 625 weld overlays deposited by GTAW cold wire feed process. The welds were performed using a

  18. TEORES DE DIMETIL SULFETO ESTIMADOS PELO MÉTODO NÍQUEL-RANEY E ACEITABILIDADE DE AMOSTRAS DE CACHAÇA Dimethyl sulfide contents estimated by Ni-Raney method and “cachaça” samples acceptability.

    Directory of Open Access Journals (Sweden)

    J. F. A. TOLEDO

    2008-08-01

    Full Text Available

    O defeito sensorial das aguardentes de cana destiladas na ausência de cobre já foi relacionado com a presença do dimetil sulfeto (DMS, o que revela a importância de identificar os teores deste composto eventualmente presente nesta bebida. Considerando-se, porém, o custo relativamente elevado dos métodos de cromatografia de fase gasosa até agora utilizados na determinação do DMS, foi objetivo deste trabalho avaliar a possível utilização do método de Níquel-Raney como forma de controlar o referido defeito. Nesse sentido foi estudada a relação entre os teores de DMS estimados pelo método proposto, com sua influência sensorial avaliada através de testes de aceitação. Os resultados obtidos permitiram concluir que mesmo em concentrações abaixo de 5mg/L, os testes sensoriais revelam haver alta correlação entre os teores de DMS, determinados pelo método de Níquel-Raney com a diminuição da qualidade sensorial das amostras avaliadas. Os resultados obtidos permitem propor o método de Níquel-Raney como uma opção válida no controle da presença de DMS na cachaça e assim, prevenir efeitos negativos na qualidade sensorial do produto final.

    The sensory defect of “cachaça”, when distilled in absence of copper, had been already related to dimethyl sulphide levels, pointing out the importance to control its contents in this beverage. Considering the relatively higher costs of the gas-chromatography techniques, the aim of this work was to evaluate the possible use of the Níquel-Raney method, to control the dimethyl sulphide contents. In this way, the dimethyl sulphide contents (estimated by Níquel-Raney method and its sensory deffect evaluated by acceptability sensory tests, were compared. The results showed that

  19. OXIDACIÓN DE LA SUPERFICIE DE CARBÓN ACTIVADO MEDIANTEHNO3 Y H2O2: EFECTO SOBRE LA REMOCIÓN DE NÍQUEL (IIEN SOLUCIÓN ACUOSA

    Directory of Open Access Journals (Sweden)

    Paola Rodriguez estupiñan

    2011-11-01

    Full Text Available Este trabajo analiza el efecto de la modificaciónde la química superficial deun carbón activado granular, CAG, poroxidación con ácido nítrico, CAG-N,y peróxido de hidrogeno, CAG-P en laadsorción de iones níquel desde soluciónacuosa.Las muestras obtenidas se caracterizarona través de diferentes técnicas; laquímica superficial se evaluó por determinacionesde acidez y basicidad total,punto de carga cero y espectroscopia IR,que muestran el efecto del agente oxidante.Los parámetros texturales, como áreasuperficial BET y volúmenes de poro, seevaluaron mediante adsorción de gases.Los valores de área superficial BET delos sólidos se encuentran entre 816 y 876m2g-1, adicionalmente se determinaronentalpías de inmersión de los carbonesactivados en agua y benceno.Finalmente, los resultados experimentalesde la adsorción desde soluciónse ajustaron a los modelos de Langmuir,Freundlich, Redlich-Peterson y Toth,y se encontró el mejor ajuste para esteúltimo. Los valores de la capacidad deadsorción determinadas por el modelo deLangmuir están entre 29,68 y 50,97 mgg-1, lo que indica que la capacidad de adsorcióndepende, en gran medida, de laquímica superficial del sólido.

  20. Global Noise and Global Englishes

    Directory of Open Access Journals (Sweden)

    Alastair Pennycook

    2013-09-01

    Full Text Available Global Noise: Rap and Hip-Hop Outside the USA, alluding to Tricia Rose’s US rap-music book, Black Noise, aims to do much more than merely extend the reach of the study of rap and hip-hop beyond the USA, as its subtitle might suggest. While acknowledging the importance of the work of both Rose and Potter, this collection’s editor, Tony Mitchell, contests their respective views that rap and hip-hop are essentially expressions of African-American culture, and that all forms of rap and hip-hop derive from these origins. He argues that these forms have become ‘a vehicle for global youth affiliations and a tool for reworking local iden- tity all over the world’.

  1. Global climate experiment; Globales Klimaexperiment

    Energy Technology Data Exchange (ETDEWEB)

    Quasching, V. [Deutsche Zentrum fuer Luft- und Raumfahrt e.V., Plataforma Solar de Almeria (Spain)

    2003-07-01

    Continued greenhouse gas emissions are part of one of our today's largest scientific experiments. Most scientists agree that anthropogenic influences are responsible for already observed climatic changes. Others demand further investigations and justify continued unlimited use of fossil energy sources. This paper describes generally accepted facts on greenhouse gas emissions and climatic change with focus on part and influence of the global energy industry. [German] Mit dem fortgesetzten Ausstoss von Treibhausgasen wird zurzeit ein globales naturwissenschaftliches Experiment betrieben. Viele Wissenschaftler sind sich einig, dass bereits beobachtete Klimaveraenderungen auf den Einfluss des Menschen zurueckzufuehren sind. Andere fordern hingegen weitere Untersuchungen und halten bis dahin eine weitere uneingeschraenkte Verwendung fossiler Energietraeger fuer gerechtfertigt. Dieser Beitrag fasst weitgehend anerkannte Fakten ueber Treibhausgasemissionen und Klimaveraenderungen zusammen und beschreibt die Rolle und den Einfluss der Energiewirtschaft.

  2. Apical displacement produced by rotary nickel-titanium instruments and stainless steel files Deslocamento apical produzido por instrumentos de níquel-titânio acionados a motor e limas de aço inoxidável

    Directory of Open Access Journals (Sweden)

    José Roberto Vanni

    2004-03-01

    Full Text Available The aim of this study was to evaluate the apical displacement produced by different rotary nickel-titanium instruments, testing the hypothesis that rotary systems with nickel-titanium instruments produce lower mean values of apical displacement than stainless steel hand instruments. A total of 100 maxillary permanent first molars were selected for the study. The mesiobuccal roots were sectioned at the top cervical third and embedded in blocks of self-curing resin. The specimens were randomly divided into 5 groups and the root canals were prepared using the following nickel-titanium instruments: Group 1 - Quantec system 2000 (Analytic Endodontics, Mexico; Group 2 - Pro-File T.0.04 (Dentsply/Maillefer, Switzerland; Group 3 - Pro-File Series 29 T.0.04 (Dentsply Tulsa, Switzerland; Group 4 - Pow-R T.0.02 (Moyco-Union Broach, USA. Specimens in Group 5 were prepared using stainless steel hand instruments Flexofile (Dentsply/Maillefer, Switzerland. All root canals were previously submitted to cervical preparation using Orifice Shaper instruments #1, 2, 3 and 4 (Dentsply/Maillefer, Switzerland. After odontometry, the remaining root canal was shaped employing increasingly larger instruments, so that the final instrument corresponded to Quantec #9, Pro-File Series 29 #6, and #35 for the other groups. Specimens in Groups 1 to 4 were prepared using an electric handpiece with 16:1 reduction at 350 rpm. The specimens in Group 5 were manually prepared. Apical displacement was measured and recorded by means of radiographic superimposition on a specific desk. Statistical analysis (ANOVA of the results revealed that all groups presented apical displacements. Considering only the nickel-titanium instruments, Group 4 showed the lowest mean value while Groups 2 and 3 produced the highest mean apical displacement values (pO objetivo deste trabalho foi avaliar o deslocamento apical produzido por diferentes instrumentos de níquel-titânio acionadas a motor testando a

  3. Remoção de níquel(II de soluções aquosas pela biomassa Sargassum filipendula em múltiplos ciclos de sorção-dessorção - DOI: 10.4025/actascitechnol.v31i1.840

    Directory of Open Access Journals (Sweden)

    Araceli Aparecida Seolatto

    2009-04-01

    Full Text Available Foi estudado o desempenho da alga marinha Sargassum filipendula na remoção de níquel de uma solução de concentração de 50 mg L-1 em pH 3,5, em colunas de leito fixo que operam em ciclos de adsorção/dessorção. Foram testados dois sistemas de eluição; o primeiro operou com a passagem direta e o segundo com a recirculação do eluente. Em seguida, foram realizados dez ciclos consecutivos de sorção-dessorção em duas colunas de leito fixo, uma regenerada com o eluente H2SO4 (0,1 M e outra com MgSO4/H2SO4 (pH 3, em sistema de recirculação do eluente. As etapas de sorção e dessorção foram realizadas em 30 e 2h, respectivamente, representando 20 dias de uso contínuo da biomassa. Foi observada alta quantidade recuperada de níquel nas etapas de eluição (aproximadamente 95%. Ao final do décimo ciclo, verificou-se que a alga Sargassum filipendula continuava apresentando valores elevados da capacidade de remoção de níquel da solução, mostrando-se como alternativa eficiente de tratamento de águas residuárias contendo metais. A regeneração da biomassa apresentou baixo custo, além de ter facilitado o processo de tratamento que dispensou trocas sucessivas da biomassa.

  4. Solidificación-Estabilización de Cromo, Níquel y Plomo en una Matriz Sólida de Hormigón Fabricada con Cemento Portland Solidification-Stabilization of Chromium, Nickel and Lead in a Concrete Solid Matrix of Portland Cement

    Directory of Open Access Journals (Sweden)

    René A Lara-Díaz

    2009-01-01

    Full Text Available Se validó la técnica de cementación como alternativa para la solidificación-estabilización de residuos sintéticos de metales pesados, cromo, níquel y plomo, usando probetas sólidas de hormigón de cemento Portland. El proceso de cementación se realiza a partir de una mezcla base para obtener hormigón con resistencia a la compresión de 29.4 N/mm², los metales fueron incorporados como sales metálicas en el agua de amasado. Se realizaron pruebas de resistencia a la compresión, lixiviación de metales por la prueba PECT con absorción atómica y se calculó la eficiencia de retención. El hormigón fabricado con cemento Portland es adecuado para su uso en la solidificación-estabilización de níquel y plomo a una concentración máxima de 0.43% para níquel y 1.94% para plomo.The technique of cementation was validated as an alternative method for the solidification-stabilization of heavy metal synthetic wastes, chromium, nickel and lead, using concrete solid cylinders made of Portland cement. The cementation process takes place starting with a concrete mixture base with compressive strength of 29.4 N/mm². Metals were incorporated as metallic salts in the mixing water. Tests of compressive strength, leaching of metals by PECT with atomic absorption were performed and retention efficiencies were calculated. Concrete made with Portland cement is appropriate for the solidification-stabilization of nickel and lead, with maximum concentrations of 0.43% of nickel and 1.94% of lead in concrete.

  5. Global Arrays

    Energy Technology Data Exchange (ETDEWEB)

    Krishnamoorthy, Sriram; Daily, Jeffrey A.; Vishnu, Abhinav; Palmer, Bruce J.

    2015-11-01

    Global Arrays (GA) is a distributed-memory programming model that allows for shared-memory-style programming combined with one-sided communication, to create a set of tools that combine high performance with ease-of-use. GA exposes a relatively straightforward programming abstraction, while supporting fully-distributed data structures, locality of reference, and high-performance communication. GA was originally formulated in the early 1990’s to provide a communication layer for the Northwest Chemistry (NWChem) suite of chemistry modeling codes that was being developed concurrently.

  6. Psychopathologie de la honte chez le sujet victime de sévices sexuels: Quels enjeux cliniques et thérapeutiques?

    Directory of Open Access Journals (Sweden)

    Delphine Scotto di Vettimo

    Full Text Available Le traitement psychothérapeutique des enfants ou des adultes victimes de traumatismes sexuels fait apparaître un sentiment de honte caractéristique. Cet éprouvé de honte, qui empourpre et farde le visage, est d’abord un sentiment social: il apparaît toujours en réaction au regard d’autrui. L’hypothèse ici envisagée est que dans le dispositif psychothérapeutique, l’expression et la reconnaissance de la honte par le sujet, loin d’être des épiphénomènes, constituent un point d’appui essentiel dans l’affirmation et la reconstruction de l’identité. Il s’agit de ne pas réduire la honte à un symptôme mais de l’inclure dans une compréhension plus globale du fonctionnement psychique: se reconnaître et se faire reconnaître sujet honteux, c’est déjà s’affirmer sujet. L’évocation d’une situation clinique sera proposée pour décrire comment la prise en compte de l’éprouvé de la honte dans une écoute posttraumatique a des effets positifs sur la dynamique psychique du sujet.

  7. The nuclear energy of the future: the researches and the objectives; L'energie nucleaire du futur: quelles recherches pour quels objectifs?

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-07-01

    Today energy problems are global problems. That is why the new generation of energy production by nuclear power must be realized basely on serious forecasts at a world scale. The nuclear energy presents many trumps for an energetic answer, at long-dated, concerning the environment and the resources. This will be for two main conditions: the ability to answer the public opinion anxiety and the development of new systems more high- performance in terms of safety and economy in the framework of the sustainable development and the non proliferation policy. These subjects are at the earth of the CEA missions. This document proposes a detailed presentation of the nuclear origins, the fuel and its cycle, the radioactive wastes and their management,the dismantling and the decommissioning of the nuclear installations, the challenges of the nuclear safety, the energy in the world, the nuclear economy, the nuclear in the world, the researches of the future, the third generation reactors, the research on radioactive wastes, the fuel cycle of the nuclear systems of the future, the uranium resources, the generation four forum, the gas coolant reactors, the thorium, hybrid systems and the thermonuclear fusion. (A.L.B.)

  8. Hamster (Mesocricetus auratus cheek pouch as an experimental model to investigate human skin and keloid heterologous graft Bolsa jugal no hamster (Mesocricetus auratus como modelo experimental de investigação de enxertos heterólogos de pele humana e quelóide

    Directory of Open Access Journals (Sweden)

    Bernardo Hochman

    2004-12-01

    Full Text Available To describe the integration process of grafts of total human skin and keloid in hamster (Mesocricetus auratus cheek pouch, whose sub-epithelium is naturally an "Immunologically Privileged Site". Fragments of human normal skin and keloid from the breast region of mulatto female patients were transplanted into the cheek pouch subepithelium in situ. Surgical procedure and grafted pouches for microscopic exam at several time points of the transplantation were standardized. The integration of grafted fragments of human skin and keloid was seen in late periods (84 days since the microscopic assessment showed the presence of blood vases within the conjunctive tissue of grafted fragments. It was also possible to see among the grafted fragments the epithelium, the appearing of early cellular infiltrated, epithelial secretion of keratin, the presence of melanocytes, and delayed changes on the aspect of collagen fibers of conjunctive tissue. Pooled results allow to define hamster cheek pouch sub-epithelium as an experimental model to investigating heterologous graft physiology of human total skin and keloid with epithelium.Descrever a integração dos enxertos de pele total humana e quelóide na bolsa jugal do hamster (Mesocricetus auratus, cujo subepitélio é, naturalmente, um "Local de Privilégio Imunológico". Foram transplantados fragmentos, de pele humana normal e de quelóide, obtidos da região mamária de pacientes pardas, no subepitélio da bolsa jugal in situ. O procedimento operatório, e de preparo das bolsas enxertadas para exame microscópico em vários períodos de transplante, foi padronizado. Verificou-se a integração dos fragmentos enxertados de pele humana e de quelóide em períodos tardios (84 dias, uma vez que a avaliação microscópica revelou a presença de vasos sangüíneos no tecido conjuntivo dos fragmentos enxertados. Foi também possível observar, nos fragmentos enxertados, o epitélio, o aparecimento de infiltrado

  9. Industrie des corps gras et changement climatique

    Directory of Open Access Journals (Sweden)

    Bosque Fabrice

    2007-11-01

    Full Text Available Whether the industry wants to anticipate the new regulations concerning the greenhouse gas (GHG emissions, or better control the costs of fluctuating fossil energy, the Bilan Carbone® assessment is a tool available to evaluate the company’s exposure, or even vulnerability, pertaining (related to these two strategic axes for the development of corporate activity. ITERG has carried out 15 Bilan Carbone® in oils and fats industry. This method is a solution for ranking emissions source by source and a good start to launch a dynamic process to reduce these emissions. In all the cases of the study, the emissions are strongly related to raw materials, freight, packaging, and consumption of fossil energy. The reduction of GHG emissions, is possible with an increased utilisation of the biomass, an improved valorisation of by-products by anaerobic digestion with recovery of the produced biogas for energy needs, and when rail, canals, rivers, or seas are preferably chosen to road transport for freight. In the oleochemicals industry, GHG emissions related to the raw materials can be reduced by the development of bio-lubricants, and innovative new products formulation based on vegetable resources.

  10. Les cyclones tropicaux et le changement climatique

    Science.gov (United States)

    André, Jean-Claude; Royer, Jean-François; Chauvin, Fabrice

    2008-09-01

    Results from observations and modelling studies, a number of which having been used to support the conclusions of the IPCC fourth assessment report, are presented. For the past and present-day (since 1970) periods, the increase of strong cyclonic activity over the North Atlantic Ocean appears to be in good correlation with increasing temperature of the ocean surface. For regions where observational data are of lesser quality, the increasing trend is less clear. In fact, assessing long-term changes is made difficult due to both the multi-decennial natural variability and the lesser coverage of observations before satellites were made available. Indirect observational data, such as those derived from quantitative estimations of damage caused by tropical cyclones, suffer from many artefacts and do not allow the resolving of the issue either. For the future, only numerical three-dimensional climate models can be used. They nevertheless run presently with too-large grid-sizes, so that their results are still not converging. Various simulations lead indeed to different results, and it is very often difficult to find the physical reasons for these differences. One concludes by indicating some ways through which numerical simulations could be improved, leading to a decrease of uncertainties affecting the prediction of cyclonic activity over the next decades.

  11. The climatic change; Le changement climatique

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2002-07-01

    For a long time the climatic change was the prerogative of the scientists. It is today a stake of the international policy. After a short presentation of a scientific evaluation of the situation, this document presents the policies of the fight against the climatic warming (Kyoto protocol, economical instruments), debates on the Usa attitude and the nuclear and general information on the topic (chronology, bibliography, glossary and Internet addresses references). (A.L.B.)

  12. Global environmental policy; Globale Umweltpolitik

    Energy Technology Data Exchange (ETDEWEB)

    Varwick, J. (ed.)

    2008-07-01

    For some years, the interest in global environmental problems and global environmental policy increased substantially. In order to prevent a sustainable and irreversible damage of the global ecological systems, it requires an ecological restructuring of the economy of the industrial nations and a environmental compatible development in the developing countries. Under this aspect, the book under consideration dedicates itself to this problem by means of five scientific contributions: (a) The principle sustainability (Felix Ekardt); (b) Climate change as a world problem (Andreas Rechkemmer); (c) The role of the pioneer of the European Union in the international climate policy: Successes and challenges (Sebastian Oberthuer); (d) Cause for conflict water (Tobias Lindenberg); (e) Environmental political instruments in theory and practice (Johanna Reichenbach/Till Requate). Instruction practice also is concerned with a cross section topic consisting of environmental and European politics: Competent instructions concerning to the European Union - an instruction series for the secondary school I (George Wiesseno, Valentin Eck). Two forum contributions go beyond the topic: (a) Against rigid (society-)political borders in the science (Tim Engartner); (b) Elections in Hamburg - Schwarz-Gruen as new coalition model for the federation? In the column 'the current topic' Gotthard Breit reports on the protests against China on the occasion of the Olympic Games 2008. The author focuses some strangenesses in the debate and pleads for a sober view of the topic. With a report on 'the Beutelsbacher discussions' at 18th to 20th February, 2008, Timo Web finishes this book.

  13. Global teaching of global seismology

    Science.gov (United States)

    Stein, S.; Wysession, M.

    2005-12-01

    Our recent textbook, Introduction to Seismology, Earthquakes, & Earth Structure (Blackwell, 2003) is used in many countries. Part of the reason for this may be our deliberate attempt to write the book for an international audience. This effort appears in several ways. We stress seismology's long tradition of global data interchange. Our brief discussions of the science's history illustrate the contributions of scientists around the world. Perhaps most importantly, our discussions of earthquakes, tectonics, and seismic hazards take a global view. Many examples are from North America, whereas others are from other areas. Our view is that non-North American students should be exposed to North American examples that are type examples, and that North American students should be similarly exposed to examples elsewhere. For example, we illustrate how the Euler vector geometry changes a plate boundary from spreading, to strike-slip, to convergence using both the Pacific-North America boundary from the Gulf of California to Alaska and the Eurasia-Africa boundary from the Azores to the Mediterranean. We illustrate diffuse plate boundary zones using western North America, the Andes, the Himalayas, the Mediterranean, and the East Africa Rift. The subduction zone discussions examine Japan, Tonga, and Chile. We discuss significant earthquakes both in the U.S. and elsewhere, and explore hazard mitigation issues in different contexts. Both comments from foreign colleagues and our experience lecturing overseas indicate that this approach works well. Beyond the specifics of our text, we believe that such a global approach is facilitated by the international traditions of the earth sciences and the world youth culture that gives students worldwide common culture. For example, a video of the scene in New Madrid, Missouri that arose from a nonsensical earthquake prediction in 1990 elicits similar responses from American and European students.

  14. Global gamesmanship.

    Science.gov (United States)

    MacMillan, Ian C; van Putten, Alexander B; McGrath, Rita Gunther

    2003-05-01

    Competition among multinationals these days is likely to be a three-dimensional game of global chess: The moves an organization makes in one market are designed to achieve goals in another in ways that aren't immediately apparent to its rivals. The authors--all management professors-call this approach "competing under strategic interdependence," or CSI. And where this interdependence exists, the complexity of the situation can quickly overwhelm ordinary analysis. Indeed, most business strategists are terrible at anticipating the consequences of interdependent choices, and they're even worse at using interdependency to their advantage. In this article, the authors offer a process for mapping the competitive landscape and anticipating how your company's moves in one market can influence its competitive interactions in others. They outline the six types of CSI campaigns--onslaughts, contests, guerrilla campaigns, feints, gambits, and harvesting--available to any multiproduct or multimarket corporation that wants to compete skillfully. They cite real-world examples such as the U.S. pricing battle Philip Morris waged with R.J. Reynolds--not to gain market share in the domestic cigarette market but to divert R.J. Reynolds's resources and attention from the opportunities Philip Morris was pursuing in Eastern Europe. And, using data they collected from their studies of consumer-products companies Procter & Gamble and Unilever, the authors describe how to create CSI tables and bubble charts that present a graphical look at the competitive landscape and that may uncover previously hidden opportunities. The CSI mapping process isn't just for global corporations, the authors explain. Smaller organizations that compete with a portfolio of products in just one national or regional market may find it just as useful for planning their next business moves.

  15. Global warming

    Science.gov (United States)

    Houghton, John

    2005-06-01

    'Global warming' is a phrase that refers to the effect on the climate of human activities, in particular the burning of fossil fuels (coal, oil and gas) and large-scale deforestation, which cause emissions to the atmosphere of large amounts of 'greenhouse gases', of which the most important is carbon dioxide. Such gases absorb infrared radiation emitted by the Earth's surface and act as blankets over the surface keeping it warmer than it would otherwise be. Associated with this warming are changes of climate. The basic science of the 'greenhouse effect' that leads to the warming is well understood. More detailed understanding relies on numerical models of the climate that integrate the basic dynamical and physical equations describing the complete climate system. Many of the likely characteristics of the resulting changes in climate (such as more frequent heat waves, increases in rainfall, increase in frequency and intensity of many extreme climate events) can be identified. Substantial uncertainties remain in knowledge of some of the feedbacks within the climate system (that affect the overall magnitude of change) and in much of the detail of likely regional change. Because of its negative impacts on human communities (including for instance substantial sea-level rise) and on ecosystems, global warming is the most important environmental problem the world faces. Adaptation to the inevitable impacts and mitigation to reduce their magnitude are both necessary. International action is being taken by the world's scientific and political communities. Because of the need for urgent action, the greatest challenge is to move rapidly to much increased energy efficiency and to non-fossil-fuel energy sources.

  16. Global Mindset in Context

    DEFF Research Database (Denmark)

    Nielsen, Rikke Kristine

    2017-01-01

    This paper addresses the call for identification of organizational contingencies related to global mindset, exploration of different forms of global mindset and their relationship with global strategies (Osland, Bird, Mendenhall & Osland, 2006). To this end, this paper explores global mindset...

  17. L’environnement naturel et le changement climatique pendant les années Bush : la pertinence d’une différenciation des échelles territoriales Climate Change and the Natural Environment in the Bush Years: The Relevance of Territorial Scale Differentiation

    Directory of Open Access Journals (Sweden)

    Cynthia Ghorra-Gobin

    2010-03-01

    Full Text Available L’attitude de l’administration fédérale au cours des huit années de l’administration Bush contraste avec celle du contexte des années 1960-1970 pour ce qui concerne la prise en compte de l’environnement naturel dans les décisions économiques. Toutefois, cet engagement limité du président Bush sur la question du changement climatique dans les débats internationaux n’a pas pour autant réduit les capacités de mobilisation des États et des villes sur ce thème.On the issue of whether climate change should be taken into account in economic decisions, the federal administration’s attitude during the Bush Presidency sharply contrasted with the attitudes of earlier administrations, particularly in the 1960’s and 1970’s. The limited concern for climate change which the federal government exhibited in the international arena did not reduce, however, the mobilization of states and local communities on this issue.

  18. cambio global

    Directory of Open Access Journals (Sweden)

    B. Alonso

    2006-01-01

    Full Text Available Un avance significativo dentro del área de la ecología sólo se podrá lograr con la adopción generalizada de un sistema basado en el uso compartido de los datos entre científicos. Esta práctica, apoyada por el desarrollo de metadatos precisos que acompañen a los propios datos, conseguirá aumentar la escala temporal y espacial de los objetos de estudio, ventajas evidentes en un área en la que cuestiones de carácter global como el estudio de los efectos del cambio climático van adquiriendo cada vez mayor importancia. En la actualidad existen numerosos grupos de científicos que trabajan voluntariamente en el desarrollo de herramientas que faciliten a los científicos la documentación y el almacenaje de sus datos. Asimismo, Internet está demostrando ser un potente instrumento para compartirlos. Aprovechar estos recursos es decisión nuestra.

  19. Minimização de defeitos em revestimentos de superligas de níquel depositada pelo processo TIG com alimentação de arame frio

    Directory of Open Access Journals (Sweden)

    Cleiton Carvalho Silva

    2014-12-01

    Full Text Available O objetivo do presente trabalho foi avaliar a influência dos parâmetros de soldagem na formação de defeitos na soldagem de revestimentos com ligas à base de níquel, e sua possível eliminação através do correto ajuste dos referidos parâmetros. Para tanto, foram depositados revestimentos com as ligas à base de Ni do tipo Inconel 625, Hastelloy C276 e Inconel 686, sobre um substrato de aço C-Mn, através do processo TIG com alimentação de arame frio. O planejamento dos experimentos foi realizado aplicando-se o método Taguchi. Os fatores de controle avaliados foram a Técnica da energia (TE, o nível de energia de soldagem (E, o tipo de liga (L, o gás de proteção (G e o tipo de tecimento (T. Outros parâmetros foram mantidos constantes, tendo sido investigados previamente. Os resultados mostraram que o tipo de tecimento em espiral, embora contribua significativamente para a redução da diluição, causa uma forte instabilidade ao processo, resultando na maioria dos casos em defeitos superficiais ou defeitos entre passes. A condição ótima para evitar a formação de defeitos entre passes identificada pelo método Taguchi foi constituída pelas seguintes combinação de fatores de controle 2-2-2-3-3, ou seja: TE-I; Emédia; Liga Hastelloy C276; Gás de proteção Ar+He; Tecimento Duplo-8. A condição ótima para a soldagem sem defeitos resulta em alto nível de diluição não sendo indicada para a soldagem de revestimentos resistentes à corrosão.

  20. Distribuição espacial de cobre, zinco e níquel em um Latossolo após quinze anos da aplicação de lodo de esgoto

    Directory of Open Access Journals (Sweden)

    Carlos Antonio Centurion Maciel

    2012-01-01

    Full Text Available A utilização agrícola do lodo de esgoto como fonte de nutrientes para as plantas é uma das alternativas mais viáveis de reciclar este material sem comprometer a qualidade do meio ambiente. Este trabalho foi realizado visando quantificar e mapear os teores de cobre, zinco e níquel em um solo após quinze anos da aplicação de lodo de esgoto (LE. De 1983 a 1987, a área experimental foi utilizada em um ensaio com doses de 0, 20, 40, 60 e 80 Mg ha-1 de lodo de esgoto e de nitrogênio (0, 50, 100 e 150 kg ha-1 em cultivo de milho. Com o término deste experimento, o solo permaneceu sob pousio com gramínea (Brachiaria decumbens Stapf e, em 2002, foram coletadas novas amostras de terra, nas camadas de 0-20 cm e de 20-40 cm de profundidade e da parte aérea das plantas de maneira georreferenciada. As amostragens foram realizadas a cada 3 m sobre três transeções distantes 15 m uma da outra e locadas em ângulo de 45º em relação aos limites da área experimental, totalizando 50 pontos amostrais. Os dados foram analisados inicialmente em função dos momentos estatísticos descritivos e a variabilidade espacial dos atributos do solo e da planta foi determinada por análise geoestatística utilizando semivariogramas que permitiram também a obtenção de mapas interpolados por krigagem desses parâmetros. Os atributos do solo pH, MOS e CTC não estão correlacionados com os teores de Cu, Zn e Ni no solo e nas plantas. Tanto o DTPA quanto o Mehlich-3 foram eficientes na predição da disponibilidade de Zn no solo e na planta. Após 15 anos da aplicação de biossólido, os teores de Cu, Zn e Ni na camada de 0 - 20 cm de profundidade e determinados tanto com DTPA quanto Mehlich-3, estavam com estrutura de dependência espacial classificada como forte e/ou moderada. O grau de dependência espacial dos teores de Cu, Zn e Ni, nas plantas, foi diferente do verificado para esses elementos no solo.

  1. Aplicación de un puente LCR en la caracterización de superficies de níquel tratadas voltamperométricamente en medio ácido en ausencia y presencia de ion cloruro

    Directory of Open Access Journals (Sweden)

    Gregori, J.

    2003-10-01

    Full Text Available Impedance spectra for nickel electrodes at his corrosion potential after voltammetric treatment in acid media has been obtained. A LCR bridge has been used, controlling the applied potential by means of a potentiostat. The passive layer, generated after successive potential scans, has been characterized by means of the interfacial double layer capacitance and the faradaic impedance. The generalized corrosion, and also the localized attack, have been observed by means of scanning electron microscopy (SEM, whilst the scanning tunnelling microscopy (STM has been used in order to realize the morphological analysis of the surfaces. In this way we want to correlate the morphological changes in the electrode surface after the successive scans in the acid media in absence and in presence of chloride with the impedance electrochemical response of the interface. When chloride is present in the acid media the charge transport across the interface is less impeded. The localized corrosion damages the passive layer electrogenerated after successive scans.

    Se obtuvieron espectros de impedancias de electrodos de níquel a su potencial de corrosión, tras su tratamiento voltamperométrico en medio ácido. Para ello, se utilizó un puente LCR controlando el potencial aplicado mediante un potenciostato. La capa de pasivado, generada tras ciclados sucesivos de potencial, se caracterizó a través de los valores de la capacidad interfacial de doble capa y de los de impedancia faradaica. La corrosión generalizada y también la localizada se observaron mediante microscopía electrónica de barrido (SEM, mientras que se utilizó la microscopía de efecto túnel (STM para realizar el análisis morfológico de las superficies. De este modo, se pretende correlacionar los cambios morfológicos producidos en la superficie electródica tras ciclados sucesivos en medio ácido en presencia y ausencia de iones cloruro, con la respuesta electroquímica de impedancias de

  2. Efeito do níquel e da concentração protéica sobre o consumo e digestibilidade aparente da materia seca, proteína bruta, energia e balanço de nitrogênio do feno de Brachiaria brizantha cv. Marandu em ovinos Effect of nickel and protein concentration on consumption and apparent digestibility of dry matter, crude protein, energy, and nitrogen balance of a Brachiaria brizantha cv. Marandu hay, in ovines

    Directory of Open Access Journals (Sweden)

    O.J. De Paula

    2005-09-01

    Full Text Available Avaliaram-se os efeitos do níquel e da concentração protéica da dieta sobre o consumo e a digestibilidade aparente da matéria seca (MS, proteína bruta (PB e energia, e balanço de nitrogênio do feno de Brachiaria brizantha cv. Marandu, oferecido a ovinos. As dietas testadas foram: A- feno; B- feno + níquel; C- feno + mistura protéica; D- feno + níquel + mistura protéica. As dietas continham, respectivamente 0,2, 5,2, 0,5 e 5,5ppm de níquel e 3,1, 3,1, 8,2 e 8,2% de PB. Nos níveis com menor concentração protéica (A e B; 3,1% PB, não foi observado efeito do níquel sobre o consumo e a digestibilidade aparente de matéria seca, energia e proteína, assim como os balanços protéico e energético. Nos com maior concentração protéica (C e D; 8,2% PB, o uso do níquel resultou em menor consumo de MS digestível, energia digestível e energia metabolizável. A maior concentração protéica teve efeito positivo sobre as características avaliadas, independentemente da suplementação ou não com níquel, com exceção da digestibilidade aparente da energia bruta, semelhantes entre as dietas B e D.This study was carried out to evaluate the effect of nickel supplementation and protein concentration of the diet on dry matter intake and apparent digestibilities of dry matter, crude protein (CP and energy, and nitrogen balance of male sheep fed on Brachiaria brizantha cv. marandu hay. The experimental diets were: A- hay; B- hay + nickel; C- hay + protein; D- hay + nickel + protein. The diets contained 0.2, 5.2, 0.5 e 5.5ppm of nickel and 3.1, 3.1, 8.2 and 8.2% of crude protein, respectively. No effect of nickel supplementation on the apparent digestibility of dry matter, energy and protein, as well as the balance of protein and energy were observed for lower protein concentration diets (A and B; 3.1% CP. The nickel supplementation reduced the digestible dry matter, digestible energy and metabolizible energy consumption of higher protein

  3. Making Globalization Work: Towards Global Economic Justice

    OpenAIRE

    Khan, Haider

    2008-01-01

    Globalization as a corporate-led process has come under much justifiable criticism. This paper attempts to give the term analytic content distinct from its more ideological formulations.. It then focuses on a normative analysis of globalization from the capabilities perspective. A freedom-centered perspective such as the capabilities approach emphasizes policies and institutions that can enhance freedom globally and locally. A global governance structure based on transparent principles of bo...

  4. Globalization and inequality

    NARCIS (Netherlands)

    Mills, Melinda

    2009-01-01

    Globalization is increasingly linked to inequality, but with often divergent and polarized findings. Some researchers show that globalization accentuates inequality both within and between countries. Others maintain that these claims are patently incorrect, arguing that globalization has disintegrat

  5. Globalization and economic cooperation

    Directory of Open Access Journals (Sweden)

    Javier Divar

    2006-12-01

    Full Text Available Economic globalization is nothing, really, that the universality of capitalism. Not globalized culture, and economic participation, and human rights, ... has only globalized market. We must react by substituting those materialistic values with cooperative economy.

  6. Corruption, croissance et capital humain : quels rapports ?

    African Journals Online (AJOL)

    15 oct. 2013 ... Les résultats confirment qu'il existe effectivement une relation négative et significative (dans un intervalle de .... avancée était que les pots de vin aidaient les hommes d'affaires à éviter les lenteurs ... corruption et croissance économique à travers son impact négatif sur ..... droit vers l'extinction. A ce propos ...

  7. Exploring Late Globalization

    DEFF Research Database (Denmark)

    Turcan, Romeo V.

    2016-01-01

    The purpose of this viewpoint paper is to motivate a program of research on late globalization, a program that could eventually lead to one or more significant theories of late globalization. The paper explores the phenomenon of late globalization as well as the idea of “late” by drawing on sparse...... literature on late globalization from sociocultural and economic perspectives. It illustrates in a vignette the character and features of late globalization observable in the withdrawal from foreign locations or deinternationalization of universities, as late globalizing entitis. The paper discusses...... the range of constructs around the core idea of late globalization, generating questions for future work in a late globalization research program....

  8. Global cities: Global parks: Globalizing of digital leisure networks.

    NARCIS (Netherlands)

    P.A. Arora (Payal)

    2013-01-01

    textabstractThis paper proposes to understand the globalizing of online Social Network Sites (SNS) through the spatial metaphor of global parks. It builds upon a commonly accepted ideation of the city as socially-constructed and that which has been harnessed to understand the spatiality of the Inte

  9. Estudio de las regularidades físico químicas de la lixiviación del magnesio presente en las colas de la fábrica de níquel René Ramos Latour de Nicaro

    Directory of Open Access Journals (Sweden)

    Yosvany Ferreiro Guerrero

    2005-01-01

    Full Text Available Se realiza un estudio de las regularidades físico químicas del proceso de lixiviación ácida orgánica del magnesio debido a que el mismo constituye uno de los elementos mayor consumidor de ácido en el proceso de lixiviación del cobalto presente en las colas de la fábrica de níquel ¨Comandante René Ramos Latour¨. Con la investigación se logra comprobar la influencia que tienen el contenido de sólido alimentado, la concentración inicial del ácido utilizado y el flujo de la solución en el proceso de lixiviación del magnesio. Se logra determinar experimentalmente que hasta un 56 % del magnesio presente en las colas pasa a formar parte de la solución.

  10. Nickel adsorption by soils in relation to pH, organic matter, and iron oxides Adsorção de níquel em solos em função de pH, matéria orgânica e óxidos de ferro

    Directory of Open Access Journals (Sweden)

    Estêvão Vicari Mellis

    2004-04-01

    Full Text Available There is little information on nickel adsorption by Brazilian soils. The objective of this experiment was to determine the effect of pH, organic matter, and iron oxides on nickel adsorption by three soils: a clayey Anionic "Rhodic" Acrudox, a sandy clay loam Anionic "Xanthic" Acrudox, and a clayey Rhodic Hapludalf. Soil samples were collected from the 0-0.2 m layer and treated to eliminate organic matter and iron oxides. The nickel adsorption was evaluated in the original samples and in those treated to remove organic matter and to remove both, organic matter and iron oxides, using 2 g soil + 20 mL of 0.01 mol L-1 CaCl2 solution containing 5 mg L-1 Ni, pH varying from 3.5 to 7.5. The nickel adsorption decreased with the elimination of organic matter. For the samples without organic matter and iron oxides, adsorption decreased only in the Anionic "Rhodic" Acrudox. The pH was the main factor involved in nickel adsorption variation, and for soil samples without organic matter and iron oxides, the maximum adsorption occurred at higher pH values.Há poucas informações disponíveis na literatura quanto à adsorção de níquel em solos do Brasil. O objetivo deste trabalho foi determinar a influência do pH, da matéria orgânica, e dos óxidos de ferro na adsorção de níquel em amostras da camada superficial (0 a 0,20 m de um Latossolo Vermelho acriférrico típico (LVwf, textura argilosa, um Latossolo Amarelo ácrico típico (LAw, textura argilo-arenosa e um Nitossolo Vermelho eutroférrico (NVef, textura muito argilosa. Foram utilizadas amostras de solo natural, de solo sem matéria orgânica (MO, e de solo sem matéria orgânica e sem óxidos de ferro, para fazer envelopes de adsorção (2,0 g de solo + 20 mL de solução contendo 5 mg L-1 de Ni em CaCl2 0,01 mol L-1, variando o pH de 3,5 a 7,5. A adsorção de níquel diminuiu com a eliminação da MO; a eliminação de MO e de óxidos de Fe só provocou diminuição na média de adsorção no

  11. Efeito do óleo essencial de Eucalyptus grandis no crescimento de isolados de fungos ectomicorrízicos em diferentes concentrações de cobre, zinco e níquel Essential oil of Eucalyptus grandis effect on the growth of ectomycorrhizal isolates in different copper, zinc and nickel concentrations

    Directory of Open Access Journals (Sweden)

    Ricardo Bemfica Steffen

    2011-09-01

    Full Text Available

    Os metabólitos secundários bioativos de algumas plantas são capazes de estimular o crescimento dos fungos ectomicorrízicos. Quando em associação com plantas, esses fungos proporcionam as mesmas condições de se desenvolverem em ambientes contaminados por metais pesados. Avaliou-se o efeito da adição de óleo essencial de Eucalyptus grandis no crescimento de isolados ectomicorrízicos na presença de cobre, zinco e níquel. Os fungos ectomicorrízicos Pisolithus microcarpus (UFSC Pt 116 e Pisolithus sp. (UFSC Pt 24 foram incubados em meio de cultura líquido na presença de concentrações crescentes de cobre, zinco e níquel e de óleo essencial de Eucalyptus grandis na concentração de 20 μL L-1. Após período de incubação de 25 dias, avaliou-se a massa seca do micélio e a concentração que inibiu o crescimento fúngico em 50%. Nas concentrações de cobre, zinco e níquel superiores a 3,94, 1,57 e 0,85 mmol L-1, respectivamente, não foi verificado aumento no crescimento dos isolados ectomicorrízicos avaliados pela adição do óleo essencial. A presença do óleo essencial de E. grandis na concentração de 20 μL L-1 em meio de cultura líquido aumentou a tolerância dos isolados ectomicorrízicos UFSC Pt 116 e UFSC Pt 24 aos metais pesados cobre, zinco e níquel.

    doi: 10.4336/2011.pfb.31.67.227

    The bioactive secondary metabolites of some plants are capable of stimulating the growth of ectomycorrhizal fungi. Combined with plants, these fungi provide the same conditions to grow in environments contaminated by heavy metals. We evaluated the effect of adding essential oil of Eucalyptus grandis in the growth of ectomycorrhizal isolates in the presence of copper, zinc and nickel. The ectomycorrhizal Pisolithus microcarpus (UFSC Pt 116 and Pisolithus sp. (UFSC Pt 24 were incubated in liquid culture medium in the presence

  12. GLOBALIZATION AND BUSINESS ETHICS

    OpenAIRE

    Khadartseva, L.; Agnaeva, L.

    2014-01-01

    It is assumed that local conditions of markets may be different, but some global markets, ethics and social responsibility principles should be applicable to all markets. As markets globalize and an increasing proportion of business activity transcends national borders, institutions need to help manage, regulate, and police the global marketplace, and to promote the establishment of multinational treaties to govern the global business system

  13. China and Global Governance

    Institute of Scientific and Technical Information of China (English)

    Wang Zaibang

    2007-01-01

    To enhance global governance has become more urgent with rapid development of globalization in the post-Cold War years. China has benefited from the process of globalization and hence should make greater contribution to the global governance in the future.

  14. Globalization challenges in a globalized world

    Directory of Open Access Journals (Sweden)

    Dr.Sc. Gjon Boriçi

    2016-01-01

    Full Text Available Globalization is an ongoing phenomenon trying to redefine the economic, social, cultural and political dynamics of contemporary societies. The communication among countries and not only them, has been increased expanding political ties, making possible greater economic integration and wider cultural relations combined with augmented global wealth across the world. But, the process of globalization is in wider terms considered a beneficial one, but also viewed by some countries as a menace to national sovereignty and national culture. This paper tries to explain the obstacles to the process of globalization and its attendant benefits. Although globalization has arisen as a result of a more stable world, the factors that had contributed to its rise also help the factions interested to bring destabilization. In an academic approach in this article, between the research and comparative methods, I have been trying to get the maxims between economy, politics and diplomacy in their efforts of affecting the global era.

  15. Synthesis and characterization of nickel oxide doped barium strontium titanate ceramics Síntese e caracterização de cerâmicas de titanato de estrôncio e bário dopado com óxido de níquel

    Directory of Open Access Journals (Sweden)

    M. Banerjee

    2012-03-01

    Full Text Available Barium strontium titanate (BST ceramics (Ba0.6Sr0.4TiO3 were synthesized by solid state sintering using barium carbonate, strontium carbonate and rutile as the precursor materials. The samples were doped with nickel oxide in different proportions. Different phases present in the sintered samples were determined from X-ray diffraction investigation and the distribution of different phases in the microstructure was assessed from scanning electron microscopy study. It was observed that the dielectric properties of BST were modified significantly with nickel oxide doping. These ceramics held promise for applications in tuned circuits.Cerâmicas de titanato de bário e estrôncio (TBS (Ba0,6Sr0,4TiO3 foram sintetizadas por sinterização do estado sólido usando carbonato de bário, carbonato de estrôncio e rutilo como materiais precursores. As amostras foram dopadas com diferentes proporções de óxido de níquel. Diferentes fases presentes nas amostras sinterizadas foram determinadas por difração de raios X e a distribuição de diferentes fases na microestrutura foi avaliada por microscopia eletrônica de varredura. Foi observado que as propriedades dielétricas do TBS foram modificadas significativamente com a dopagem do óxido de níquel. Essas cerâmicas são promissoras para aplicação em dispositivos.

  16. Individualización cinética de reacciones simultáneas por espectrometría de masa: descomposición térmica de los carbonatos básicos de níquel y de cobalto

    Directory of Open Access Journals (Sweden)

    Antonio Jerez-Mendez

    2001-03-01

    Full Text Available El análisis térmico por espectrometría de masa resuelve problemas experimentales que presenta el análisis térmico convencional al aire, en el cual es imposible detectar las reacciones que tienen lugar simultáneamente en un mismo intervalo de temperatura y, por lo tanto, resulta imposible individualizarlas a partir de la pérdida de masa por análisis termogravimétrico (AT o por el efecto (endotérmico o exotérmico, según el caso registrado por análisis térmico diferencial (ATD debido al solapamiento de los procesos en dichas curvas. El análisis térmico mediante espectrometría de masa permitió individualizar la cinética de la descomposición térmica de los carbonatos básicos de níquel y de cobalto. Estos resultados se comparan con los obtenidos en la descomposición térmica del carbonato de calcio, donde existe la evolución de un único producto gaseoso. Los resultados demuestran que en la descomposición térmica de los carbonatos básicos de níquel y de cobalto, la salida del agua de constitución y del dióxido de carbono no son procesos sucesivos. Parte del agua de constitución abandona la muestra simultáneamente con el dióxido de carbono, aunque en los termogramas estas transformaciones sólo se visualizan como efectos que se solapan

  17. Discriminación de reacciones simultáneas por espectrometría de masa en la descomposición térmica de carbonatos básicos de níquel y de cobalto

    Directory of Open Access Journals (Sweden)

    Julio C. Llópiz-Yurell

    2010-03-01

    Full Text Available Se determinaron, por espectrometría de masa y termogravimetría convencional, los parámetros y modelos cinéticos de los procesos de salida de agua y dióxido de carbono en la descomposición térmica de carbonatos básicos de níquel y de cobalto. Se demostró la ventaja de la espectrometría de masa para individualizar la cinética de procesos complejos de descomposición térmica, cuando las reacciones ocurren simultáneamente y de forma competitiva en un intervalo de temperatura. Se estudió además la cinética de la descomposición térmica del carbonato de calcio por ambas técnicas para comparar los resultados. Se observó la semejanza entre los resultados de las dos técnicas, en cuanto a modelo y parámetros cinéticos, cuando ocurre un proceso único durante la trasformación de la muestra, como en el carbonato de calcio, mientras que para los carbonatos básicos de níquel y de cobalto en la salida de agua y dióxido de carbono, que son reacciones simultáneas en el mismo intervalo de temperatura y además son competitivas, los valores de los parámetros cinéticos difieren notablemente de los obtenidos por el análisis termogravimétrico, que no puede discriminar la cinética de ambos procesos, aunque el modelo cinético resultó el mismo por ambas técnicas.

  18. Global health and the global economic crisis.

    Science.gov (United States)

    Benatar, Solomon R; Gill, Stephen; Bakker, Isabella

    2011-04-01

    Although the resources and knowledge for achieving improved global health exist, a new, critical paradigm on health as an aspect of human development, human security, and human rights is needed. Such a shift is required to sufficiently modify and credibly reduce the present dominance of perverse market forces on global health. New scientific discoveries can make wide-ranging contributions to improved health; however, improved global health depends on achieving greater social justice, economic redistribution, and enhanced democratization of production, caring social institutions for essential health care, education, and other public goods. As with the quest for an HIV vaccine, the challenge of improved global health requires an ambitious multidisciplinary research program.

  19. Theorising Global Business Spaces

    OpenAIRE

    Jones, A

    2009-01-01

    Over the last decade, geographers have paid a great deal of attention to transnational firms (TNCs) and global production networks (GPNs) in the global economy, to the emergence of a mobile transnational business class and also to the development of global or globalizing cities. All three literatures have made important contributions to understanding the spatiality of global economic activity, but each adopts a fairly discreet theoretical and empirical focus. This article aims to outline a nu...

  20. Globalization and human cooperation.

    Science.gov (United States)

    Buchan, Nancy R; Grimalda, Gianluca; Wilson, Rick; Brewer, Marilynn; Fatas, Enrique; Foddy, Margaret

    2009-03-17

    Globalization magnifies the problems that affect all people and that require large-scale human cooperation, for example, the overharvesting of natural resources and human-induced global warming. However, what does globalization imply for the cooperation needed to address such global social dilemmas? Two competing hypotheses are offered. One hypothesis is that globalization prompts reactionary movements that reinforce parochial distinctions among people. Large-scale cooperation then focuses on favoring one's own ethnic, racial, or language group. The alternative hypothesis suggests that globalization strengthens cosmopolitan attitudes by weakening the relevance of ethnicity, locality, or nationhood as sources of identification. In essence, globalization, the increasing interconnectedness of people worldwide, broadens the group boundaries within which individuals perceive they belong. We test these hypotheses by measuring globalization at both the country and individual levels and analyzing the relationship between globalization and individual cooperation with distal others in multilevel sequential cooperation experiments in which players can contribute to individual, local, and/or global accounts. Our samples were drawn from the general populations of the United States, Italy, Russia, Argentina, South Africa, and Iran. We find that as country and individual levels of globalization increase, so too does individual cooperation at the global level vis-à-vis the local level. In essence, "globalized" individuals draw broader group boundaries than others, eschewing parochial motivations in favor of cosmopolitan ones. Globalization may thus be fundamental in shaping contemporary large-scale cooperation and may be a positive force toward the provision of global public goods.

  1. Local, global : intégrer atténuation et adaptation

    OpenAIRE

    Locatelli, Bruno

    2010-01-01

    International audience; Depuis la prise de conscience des impacts présents et potentiels du changement climatique, les réponses se sont davantage focalisées sur la réduction des gaz à effet de serre (GES) dans l’atmosphère, l’« atténuation » (mitigation en anglais), que sur la réduction de la vulnérabilité des sociétés et des écosystèmes face au changement climatique, « l’adaptation ». Aujourd’hui, le changement du climat est perçu comme inévitable. L’adaptation prend donc une importance croi...

  2. Program GICC, final report (March 2005), inventory of carbonaceous aerosol particles from 1860 to 2100 or which carbonaceous aerosol for a significant climatic regional/global impact?; Programme GICC, RAPPORT DEFINITIF (Mars 2005), inventaire d'emissions d'aerosol carbone de 1860 a 2100 ou quelles emissions d'aerosol carbone pour un impact climatique regional/global significatif?

    Energy Technology Data Exchange (ETDEWEB)

    Cachier, H.; Guinot, B. [Laboratoire des Sciences du Climat et de l' Environnment, UMR CEA/CNRS 1572 - CEA Saclay, 91 - Gif sur Yvette (France); Criqui, P.; Mima, S. [IEPE, 38 - Grenoble (France); Brignon, J.M. [INERIS, 60 - Verneuil-en-Halatte (France); Penner, J. [Michigan Univ., Ann Arbor, MI (United States); Carmichael, G. [Iowa Univ., Iowa City, IA (United States); Gadi, R. [National Physical Lab., New Delhi (India); Denier Van der Gon, H. [TNO Hollande (Netherlands); Gregoire, J.M. [JRC, Ispra (Italy); Liousse, C.; Michel, C.; Guillaume, B.; Junker, C

    2007-07-01

    The aim of our program is to determine past, present and future emission inventories of carbonaceous particles from 1860 to 2100 for fossil fuel and biofuel sources. Emission inventories for savannah and forest fires have been developed by using burnt area products given by satellite for Asia and Africa. The strong collaboration with the different groups attending this GICC program has allowed to develop the following results. 1- With the improvement of algorithms and new choices for emission factors, emission inventories for black carbon (BC), primary organic carbon (OCp) and total organic carbon (OCtot) have been constructed for the period 1950 to 1997 for fossil fuel and biofuel sources. With these new development, biofuel sources have been seen to be significant, especially in the developing countries. 2- Past inventories have been developed for fossil fuel and biofuel sources from 1860 to 1997 by taking into account the evolution of fuel consumption, fuel use and emission factors. 3- Savannah and forest fire inventories have been constructed based on burnt area products, for Africa (1981-1991, 2000) and Asia (2000-2001). These results show the importance of using real time data instead of statistics. 4-Future emission inventory of black carbon by fossil fuel sources has been constructed for 2100 following the IPCC scenario A2 (catastrophic case) and B1 (perfect world). 5-Characterization of biofuel emissions has been realized by organizing an experiment in a combustion chamber where indian and chinese biofuels (fuelwood, agricultural wastes, dung-cake etc..). were burnt, reproducing the burning methods used in these countries. 6-Finally, the differences between the existing inventories of carbonaceous aerosols has been explained. (A.L.B.)

  3. Global health research needs global networking

    NARCIS (Netherlands)

    Ignaciuk, A.; Leemans, R.

    2012-01-01

    To meet the challenges arising from global environmental change on human health, co-developing common approaches and new alliances of science and society are necessary. The first steps towards defining cross-cutting, health-environment issues were developed by the Global Environmental Change and Hum

  4. Global from the Start

    DEFF Research Database (Denmark)

    Tanev, Stoyan

    2012-01-01

    This article provides insights from recent research on firms that are "born global". A born-global firm is a venture launched to exploit a global niche from the first day of its operations. The insights in this article are relevant to technology entrepreneurs and top management teams of new...... technology firms. After discussing various definitions for the term "born global" and identifying the main characteristics of born-global firms, this article lists a few salient characteristics of firms that are born global in the technology sector. The article concludes by identifying opportunities...

  5. Global Business Models

    DEFF Research Database (Denmark)

    Rask, Morten

    insight from the literature about business models, international product policy, international entry modes and globalization into a conceptual model of relevant design elements of global business models, enabling global business model innovation to deal with differences in a downstream perspective...... regarding the customer interface and in an upstream perspective regarding the supply infrastructure. The paper offers a coherent conceptual dynamic meta-model of global business model innovation. Students, scholars and managers within the field of international business can use this conceptualization...... to understand, to study, and to create global business model innovation. Managerial and research implications draw on the developed ideal type of global business model innovation....

  6. Globalization and democracy

    Directory of Open Access Journals (Sweden)

    DEEPAK NAYYAR

    2015-09-01

    Full Text Available ABSTRACTThe gathering momentum of globalization in the world economy has coincided with the spread of political democracy across countries. Economies have become global. But politics remains national. This essay explores the relationship between globalization and democracy, which is neither linear nor characterized by structural rigidities. It seeks to analyze how globalization might constrain degrees of freedom for nation states and space for democratic politics, and how political democracy within countries might exercise some checks and balances on markets and globalization. The essential argument is that the relationship between globalization and democracy is dialectical and does not conform to ideological caricatures.

  7. COMPETING CONCEPTIONS OF GLOBALIZATION

    Directory of Open Access Journals (Sweden)

    Leslie Sklair

    2015-08-01

    Full Text Available Globalization is a relatively new idea in the social sciences, although people who work in and write about the mass media, transnational corporations and international business have been using it for some time. The purpose of this paper is to critically review the ways in which sociologists and other social scientists use ideas of globalization and to evaluate the fruitfulness of these competing conceptions. The central feature of the idea of globalization is that many contemporary problems cannot be adequately studied at the level of nation-states, that is, in terms of each country and its inter-national relations. Instead, they need to be conceptualized in terms of global processes. Some have even gone so far as to predict that global forces, by which they usually mean transnational corporations and other global economic institutions, global culture or globalizing belief systems/ideologies of various types, or a combination of all of these, are becoming so powerful that the continuing existence of the nation-state is in serious doubt. This is not a necessary consequence of most theories of globalization. The argument of this paper is that much of the globalization literature is confused because not all those who use the term distinguish it clearly enough from internation-alization, and some writers appear to use the two terms interchangeably. I argue that a clear distinction must be drawn between the inter-national and the global. The hyphen in inter-national is to distinguish (inadequate conceptions of the global' founded on the existing even if changing system of nation-states, from (genuine conceptions of the global based on the emergence of global processes and a global system of social relations not founded on national characteristics or nation-states. This global system theory is the framework for my own research. Globalization studies can be categorized on the basis of four research clusters:1. The world-systems approach; 2. The global

  8. Global solidarity, migration and global health inequity.

    Science.gov (United States)

    Eckenwiler, Lisa; Straehle, Christine; Chung, Ryoa

    2012-09-01

    The grounds for global solidarity have been theorized and conceptualized in recent years, and many have argued that we need a global concept of solidarity. But the question remains: what can motivate efforts of the international community and nation-states? Our focus is the grounding of solidarity with respect to global inequities in health. We explore what considerations could motivate acts of global solidarity in the specific context of health migration, and sketch briefly what form this kind of solidarity could take. First, we argue that the only plausible conceptualization of persons highlights their interdependence. We draw upon a conception of persons as 'ecological subjects' and from there illustrate what such a conception implies with the example of nurses migrating from low and middle-income countries to more affluent ones. Next, we address potential critics who might counter any such understanding of current international politics with a reference to real-politik and the insights of realist international political theory. We argue that national governments--while not always or even often motivated by moral reasons alone--may nevertheless be motivated to acts of global solidarity by prudential arguments. Solidarity then need not be, as many argue, a function of charitable inclination, or emergent from an acknowledgment of injustice suffered, but may in fact serve national and transnational interests. We conclude on a positive note: global solidarity may be conceptualized to helpfully address global health inequity, to the extent that personal and transnational interdependence are enough to motivate national governments into action.

  9. Réponses des grands lacs périalpins aux pressions anthropiques et climatiques récentes : reconstitutions spatio-temporelles à partir d'archives sédimentaires

    OpenAIRE

    Jenny, Jean-Philippe

    2013-01-01

    This Thesis is dedicated to the identification of issues (local and global stressors) that affected lakes physical and biogeological environment over the last 150 years through sediment-based palaeo-reconstructions. Our researches focussed on the recent development of hypoxia (i.e. low oxygen concentrations) which is a good indicator of lake ecosystem quality at the hypolimnetic scale. The aim is to reconstruct in 3 perialpin lakes (Geneva, Bourget, Annecy), with annual resolution, the evolut...

  10. Climate change: what perspectives for the development of renewable energies in France and in Europe?; Changement climatique: quelles perspectives pour le developpement des energies renouvelables en France et en Europe?

    Energy Technology Data Exchange (ETDEWEB)

    Mousel, M. [Ministere de l' Amenagement du Territoire et de l' Environnement, MIES, 75 - Paris (France); Kandel, R. [Ecole Polytechnique, Lab. de Meteorologie Dynamique, CNRS, 91 - Palaiseau (France); Connor, H. [HELIO International (France)] [and others

    2000-07-01

    The greatest challenge facing the world at the beginning of the century, according to hundreds of business and government leaders is climate change. Different propositions can help fighting against a global warming. The development of renewable energy sources, ( wind power, geothermal power) the market of carbon dioxide, the reduction of greenhouse gases emissions, path by path, the building and the heat network are so possibilities that are studied. (N.C.)

  11. Global Governance of Migration

    OpenAIRE

    2011-01-01

    The aim of this thesis is to analyze the recently formed global governance of migration, which has got an unprecedented trans-boundary nature due to the impacts og globalization in the post Cold War era. 

  12. Information Global Marketing Management

    National Research Council Canada - National Science Library

    Aleksandar Grubor

    2010-01-01

    Global marketing management needs to be implemented based on valid, i.e. reliable, timely, verifiable and high-quality marketing information, which will enable valid decision-making in global business operations...

  13. Global Citizenship Education

    DEFF Research Database (Denmark)

    Roesgaard, Marie Højlund

    2016-01-01

    Global citizenship as an idea has become an increasingly important issue on the educational agenda since the late 1970’s. The importance allotted to this issue is clear in the attention given to it by for example UNESCO where global citizenship education (GCED) is an area of strategic focus....... Increasingly schools all over the world are attempting to or expected to educate the global citizen, but how exactly do you educate the global citizen? What does this global citizenship consist of? While surely the type of training and education needed to train a global citizen will vary greatly depending......, that it is possible to develop a feeling of global citizenship in a society. However, it is very important to keep in mind that global citizenship education as treated in the literature so far has been quite Eurocentric (this includes North America). A survey of research on GCED found that two thirds of the research...

  14. Global Health Observatory (GHO)

    Science.gov (United States)

    ... Data repository Reports Country statistics Map gallery Standards Global Health Observatory (GHO) data Monitoring health for the ... Health financing Health workforce 3.d National and global health risks International Health Regulations (2005) Monitoring Framework ...

  15. Global Health System

    Science.gov (United States)

    ... Issue Past Issues From the NIH Director: A Global Health System Past Issues / Spring 2008 Table of ... officials the issues of world health and NIH's global outreach. He spoke with MedlinePlus ' Christopher Klose on ...

  16. Democratic Support and Globalization

    OpenAIRE

    Thomas, K

    2016-01-01

    This chapter explores the impact of globalization on satisfaction with democracy in a comparative perspective. It explicitly tests whether globalization fosters or constrains support for democracy and if its potential negative effects vanish once countries compensate for the potential negative effects of globalization. The analyses rely on survey data collected by the Comparative Study of Electoral Systems to indicate citizens’ support for democracy. Globalization is captured by the KOF Index...

  17. THE FUTURE OF GLOBALIZATION

    Directory of Open Access Journals (Sweden)

    Adrian-Gabriel DINESCU

    2017-05-01

    Full Text Available Once humanity had made the necessary technological leaps for promoting fast and easy travel, the acceleration of human endeavors was inevitable. This acceleration has made possible the integration and globalization of national economies, a global economy emerging. Globalization has become a force impossibile to resist and impossible to deny. Globalization has both advantages and disadvantages. The issue that humanity must understand is it cannot be reversed, just its disadvantages reduced or made bearable.

  18. The Global Value Chain

    DEFF Research Database (Denmark)

    Sørensen, Olav Jull

    The conference paper aims to develop the global value chain concept by including corporate internal value adding activities and competition to the basic framework in order to turn the global value chain into a strategic management tool......The conference paper aims to develop the global value chain concept by including corporate internal value adding activities and competition to the basic framework in order to turn the global value chain into a strategic management tool...

  19. The Global Value Chain

    DEFF Research Database (Denmark)

    Sørensen, Olav Jull

    The conference paper aims to develop the global value chain concept by including corporate internal value adding activities and competition to the basic framework in order to turn the global value chain into a strategic management tool......The conference paper aims to develop the global value chain concept by including corporate internal value adding activities and competition to the basic framework in order to turn the global value chain into a strategic management tool...

  20. GMOs and Global Justice

    DEFF Research Database (Denmark)

    Toft, Kristian Høyer

    2012-01-01

    claims to justice. This article investigates how GMOs might generate claims to global justice and what type of justice is involved. The paper argues that the debate on GMOs and global justice can be categorized into three views, i.e., the cosmopolitan, the pluralist, and the sceptic. The cosmopolitan...... on the premise that global cooperation on GMO production provides the relevant basis for assessing the use of GMOs by the standard of global distributive justice....

  1. Global Governance, Educational Change

    Science.gov (United States)

    Mundy, Karen

    2007-01-01

    In the last half decade, a rising literature has focused on the idea that processes of economic, political and social globalization require analysis in terms of governance at the global level. It is argued in this article that emerging forms of global governance have produced significant challenges to conventional conceptions of international…

  2. Security Components of Globalization

    Directory of Open Access Journals (Sweden)

    Florin Iftode

    2015-05-01

    Full Text Available The objective of this paper is our intention to present what are the main connections between globalization and international security. In terms of global security we can perceive the globalization as a process by which global state is represented by the UN, with a single world system, represented by major security organizations and with global effects. We will present from the beginning the main theoretical aspects that define the phenomenon of globalization, and then our contribution in assessing the implications of this phenomenon on the regional and global security. The results of our research are materialized in the last part of the paper. They emphasize the personal assessments on how the phenomenon of globalization has direct effect on global security. When talking about government, we think of norms, rules and decisionmaking procedures in the management of international life. The value that we add to the new scientific interpretation of the definition of globalization is represented, primarily, by the valuable bibliographic used resources and the original approach on the concept that refers to the links between globalization and security. This article may be, at any time, a starting point in an interesting research direction in the field of global security.

  3. Global Cancer Humanitarian Award

    Science.gov (United States)

    Pat Garcia-Gonzalez of the Max Foundation accepted the first annual NCI Global Cancer Medicine Humanitarian Award for her work in chronic myeloid leukemia at the NCI, Center for Global Health Symposium for Global Cancer Research, held in Boston on March 25, 2015.

  4. Globalization and world trade

    Science.gov (United States)

    Peter J. Ince; Joseph Buongiorno

    2007-01-01

    This chapter discusses economic globalization and world trade in relation to forest sector modeling for the US/North American region. It discusses drivers of economic globalization and related structural changes in US forest product markets, including currency exchange rates and differences in manufacturing costs that have contributed to the displacement of global...

  5. Global Health Security

    Centers for Disease Control (CDC) Podcasts

    2017-09-21

    Dr. Jordan Tappero, a CDC senior advisor on global health, discusses the state of global health security.  Created: 9/21/2017 by National Center for Emerging and Zoonotic Infectious Diseases (NCEZID), Center for Global Health (CGH).   Date Released: 9/21/2017.

  6. Developing Successful Global Leaders

    Science.gov (United States)

    Training, 2011

    2011-01-01

    Everyone seems to agree the world desperately needs strong leaders who can manage a global workforce and all the inherent challenges that go with it. That's a big part of the raison d'etre for global leadership development programs. But are today's organizations fully utilizing these programs to develop global leaders, and, if so, are they…

  7. Globalization and American Education

    Science.gov (United States)

    Merriman, William; Nicoletti, Augustine

    2008-01-01

    Globalization is a potent force in today's world. The welfare of the United States is tied to the welfare of other countries by economics, the environment, politics, culture, information, and technology. This paper identifies the implications of globalization for education, presents applications of important aspects of globalization that teachers…

  8. Globalization and American Education

    Science.gov (United States)

    Merriman, William; Nicoletti, Augustine

    2008-01-01

    Globalization is a potent force in today's world. The welfare of the United States is tied to the welfare of other countries by economics, the environment, politics, culture, information, and technology. This paper identifies the implications of globalization for education, presents applications of important aspects of globalization that teachers…

  9. Developing Successful Global Leaders

    Science.gov (United States)

    Training, 2011

    2011-01-01

    Everyone seems to agree the world desperately needs strong leaders who can manage a global workforce and all the inherent challenges that go with it. That's a big part of the raison d'etre for global leadership development programs. But are today's organizations fully utilizing these programs to develop global leaders, and, if so, are they…

  10. Mapping Global Citizenship

    Science.gov (United States)

    Stein, Sharon

    2015-01-01

    The demand to cultivate global citizenship is frequently invoked as central to colleges' and universities' internationalization efforts. However, the term "global citizenship" remains undertheorized in the context of U.S. higher education. This article maps and engages three common global citizenship positions--entrepreneurial, liberal…

  11. Global water governance

    NARCIS (Netherlands)

    Gupta, J.; Falkner, R.

    2013-01-01

    Although (fresh) water challenges are primarily local in nature, globalization has led to feedback effects that make many water challenges global in nature. This chapter examines global water governance. It discusses four phases of water governance, argues that water governance is dispersed and

  12. Global water governance

    NARCIS (Netherlands)

    Gupta, J.; Falkner, R.

    2013-01-01

    Although (fresh) water challenges are primarily local in nature, globalization has led to feedback effects that make many water challenges global in nature. This chapter examines global water governance. It discusses four phases of water governance, argues that water governance is dispersed and inco

  13. Global Ethics Applied: Global Ethics, Economic Ethics

    OpenAIRE

    Stückelberger, Christoph

    2016-01-01

    Global Ethics Applied’ in four volumes is a reader of 88 selected articles from the author on 13 domains: Vol. 1 Global Ethics, Economic Ethics; Vol. 2 Environmental Ethics; Vol. 3 Development Ethics, Political Ethics, Dialogue and Peace Ethics, Innovation and Research Ethics, Information and Communication Ethics; Vol. 4 Bioethics and Medical Ethics, Family Ethics and Sexual Ethics, Leadership Ethics, Theological Ethics and Ecclesiology, Methods of Ethics. It concludes with the extended Bibli...

  14. Global Peace through the Global University System

    Directory of Open Access Journals (Sweden)

    Cengiz Hakan AYDIN

    2006-01-01

    Full Text Available Utopia is defined in Encarta Dictionary as “an ideal and perfect place or state, where everyone lives in harmony and everything is for the best.” Developments all around the world especially in the last decade have supported the idea that global peace is nothing but just a utopian dream. However, for centuries a group of believers have always been in search of global peace via different means. This book, titled as “Global Peace through the Global University System”, can be considered as one of the artifacts of this search.Actually this book is a collection of papers presented in working conference on the Global University System (GUS hosted by the University of Tampere, Finland in 1999. The main goal of the conference was bringing international experts to share their philosophy, past and present experiences about the GUS. The conference was held by the University of Tampere because UNESCO has an agreement with the University to establish the UNESCOChair in Global e-Learning.

  15. How Global is Global Civil Society?

    Directory of Open Access Journals (Sweden)

    Neera Chandhoke

    2015-08-01

    Full Text Available In recent times the concept of global civil society has made its appearance on national and international intellectual, as well as political agendas, in a major way. It is of some interest that two other concepts, both of which call for transcendence of national boundaries in precisely the same way as global civil society does, have also made their appearance on the scene of intellectual debates at roughly the same time: the concept of cosmopolitanism and that of transnational justice. All three concepts have dramatically expanded the notion of commitment to one’s fellow beings beyond the nation state. And all three concepts have extended critiques of policies that violate the dignity of human beings from national governments to the practices of inter-national institutions such as the World Bank, the International Monetary Fund, and the World Trade Forum. In sum the inter-related concepts of global civil society, cosmopolitanism, and transnational justice have greatly enlarged the traditional domain of political theory. And yet for any political theorist who is acutely conscious of the phenomenon of power, these concepts are not unproblematic. For the practices of global civil society may just reinforce the intellectual and the moral power of the West over the postcolonial world. This is particularly true of say global human rights organizations. This paper will attempt to raise some questions of the concept and the practices of global civil society from the perspective of the countries of the South.

  16. Global Sourcing of Services

    DEFF Research Database (Denmark)

    Ørberg Jensen, Peter D.; Petersen, Bent

    2013-01-01

    The global sourcing of services offers high returns but is also associated with high risks. The extent to which firms engage in ‘transformational’ global sourcing (i.e., global sourcing implying considerable changes in the home organization) chiefly depends on management's comfort zone which......, in turn, is determined by managers' risk perceptions, risk tolerance, and ability to employ risk-reducing measures. Many firms move into transformational global sourcing more or less deliberately. However, as the human asset specificity of the global sourcing operation increases, managers find themselves...

  17. Globalization and Economic Freedom

    DEFF Research Database (Denmark)

    Bjørnskov, Christian

    2006-01-01

    This paper employs a panel data set to estimate the effect of globalization on four measures of economic freedom. Contrary to previous studies, the paper distinguishes between three separate types of globalization: economic, social and political. It also separates effects for poor and rich...... countries, and autocracies and democracies. The results show that economic globalization is negatively associated with government size and positively with regulatory freedom in rich countries; social globalization is positively associated with legal quality in autocracies and with the access to sound money...... in democracies. Political globalization is not associated with economic freedom...

  18. Globalization and Economic Freedom

    DEFF Research Database (Denmark)

    Bjørnskov, Christian

    2006-01-01

    This paper employs a panel data set to estimate the effect of globalization on four measures of economic freedom. Contrary to previous studies, the paper distinguishes between three separate types of globalization: economic, social and political. It also separates effects for poor and rich...... countries, and autocracies and democracies. The results show that economic globalization is negatively associated with government size and positively with regulatory freedom in rich countries; social globalization is positively associated with legal quality in autocracies and with the access to sound money...... in democracies. Political globalization is not associated with economic freedom...

  19. Institutionalizing Global Governance

    DEFF Research Database (Denmark)

    Rasche, Andreas; Gilbert, Dirk Ulrich

    2012-01-01

    The United Nations Global Compact – which is a Global Public Policy Network advocating 10 universal principles in the areas of human rights, labor standards, environmental protection, and anticorruption – has turned into the world's largest corporate responsibility initiative. Although the Global...... Compact is often characterized as a promising way to address global governance gaps, it remains largely unclear why this is the case. To address this problem, we discuss to what extent the initiative represents an institutional solution to exercise global governance. We suggest that new governance modes...

  20. Global Collaborative STEM Education

    Science.gov (United States)

    Meabh Kelly, Susan; Smith, Walter

    2016-04-01

    Global Collaborative STEM Education, as the name suggests, simultaneously supports two sets of knowledge and skills. The first set is STEM -- science, technology, engineering and math. The other set of content knowledge and skills is that of global collaboration. Successful global partnerships require awareness of one's own culture, the biases embedded within that culture, as well as developing awareness of the collaborators' culture. Workforce skills fostered include open-mindedness, perseverance when faced with obstacles, and resourceful use of technological "bridges" to facilitate and sustain communication. In respect for the 2016 GIFT Workshop focus, Global Collaborative STEM Education projects dedicated to astronomy research will be presented. The projects represent different benchmarks within the Global Collaborative STEM Education continuum, culminating in an astronomy research experience that fully reflects how the global STEM workforce collaborates. To facilitate wider engagement in Global Collaborative STEM Education, project summaries, classroom resources and contact information for established international collaborative astronomy research projects will be disseminated.

  1. Modeling of the climate system and of its response to a greenhouse effect increase; Modelisation du systeme climatique et de sa reponse a une augmentation de l'effet de serre

    Energy Technology Data Exchange (ETDEWEB)

    Li, L. [Universite Pierre et Marie Curie, CNRS, Lab. de Meteorologie Dynamique, 75 - Paris (France)

    2005-07-01

    The anthropic disturbance of the Earth's greenhouse effect is already visible and will enhance in the coming years or decades. In front of the rapidity and importance of the global warming effect, the socio-economical management of this change will rise problems and must be studied by the scientific community. At the modeling level, finding a direct strategy for the validation of climate models is not easy: many uncertainties exist because energy transformations take place at a low level and several processes take place at the same time. The variability observed at the seasonal, inter-annual or paleo- scales allows to validate the models at the process level but not the evolution of the whole system. The management of these uncertainties is an integral part of the global warming problem. Thus, several scenarios can be proposed and their risk of occurrence must be estimated. This paper presents first the greenhouse effect, the climatic changes during geologic times, the anthropic disturbance of the greenhouse effect, the modeling of climate and the forecasting of its evolution. (J.S.)

  2. Remoção de níquel(II de soluções aquosas pela biomassa Sargassum filipendula em múltiplos ciclos de sorção-dessorção = Removal of nickel (II from aqueous solutions by Sargassum filipendula biomass in multiple cycles of sorption-desorption

    Directory of Open Access Journals (Sweden)

    Araceli Aparecida Seolatto

    2009-01-01

    Full Text Available Foi estudado o desempenho da alga marinha Sargassum filipendula na remoção de níquel de uma solução de concentração de 50 mg L-1 em pH 3,5, em colunas de leito fixo que operam em ciclos de adsorção/dessorção. Foram testados dois sistemas de eluição; oprimeiro operou com a passagem direta e o segundo com a recirculação do eluente. Em seguida, foram realizados dez ciclos consecutivos de sorção-dessorção em duas colunas de leito fixo, uma regenerada com o eluente H2SO4 (0,1 M e outra com MgSO4/H2SO4 (pH 3, em sistema de recirculação do eluente. As etapas de sorção e dessorção foram realizadas em 30 e 2h, respectivamente, representando 20 dias de uso contínuo da biomassa. Foi observada alta quantidade recuperada de níquel nas etapas de eluição (aproximadamente 95%. Ao finaldo décimo ciclo, verificou-se que a alga Sargassum filipendula continuava apresentando valores elevados da capacidade de remoção de níquel da solução, mostrando-se como alternativa eficiente de tratamento de águas residuárias contendo metais. A regeneração dabiomassa apresentou baixo custo, além de ter facilitado o processo de tratamento que dispensou trocas sucessivas da biomassa.The behavior of seaweed Sargassum filipendula during a removal of nickel from a 50 mg L-1 aqueous solution at pH 3.5 in fixed-bed columns operating in adsorption/desorption cycles was studied. Twoelution systems were tested: the first one operating with the direct passage of eluant, and the second one with the solution recycle. Then, ten consecutive sorption-desorption cycles were investigated in two packed-bed columns; the first column was regenerated with H2SO4 (0.1 M, and the second one with MgSO4/H2SO4 (3.5% in pH 3 in an eluant recycle system. The sorption and desorption stages were carried out for about 30 and 2h, respectively, representing 20 days of continuous use of the biomass. A high quantity of recovered nickelwas observed in the elution stages

  3. Les lieux du tourisme : de quel(s paradis parle-t-on ?

    Directory of Open Access Journals (Sweden)

    Philippe Violier

    2008-11-01

    Full Text Available Le tourisme a été inventé en même temps que la révolution industrielle, la rendant possible et supportable en permettant de vivre un ailleurs. Plus l’emprise du travail et des contraintes du quotidien s’appesantissait, plus le paradis touristique s’est imposé comme un horizon finalement de plus en plus accessible, par un juste retour des choses : l’emprise croissante sur le monde matériel ouvrant les portes du paradis, à l’opposé d’un paradis virtuel promis aux seuls élus. Et qui plus est, les modes d’emploi de cet Éden sont bien plus variés que la seule découverte. La richesse des modes de faire avec le Monde stimule d’autant l’envie d’y accéder. Une fois atteintes les limites du Monde, loin de se dissoudre dans l’uniformisation, le tourisme prend davantage d’ampleur. Les découvertes ont ouvert la voie et mis en images le Monde, renforçant l’envie de le découvrir. Loin d’aboutir à une prétendue disneylandisation, la mise en relation des lieux entre eux produit à la fois de la diversité et les moyens d’y accéder.

  4. Global warming without global mean precipitation increase?

    Science.gov (United States)

    Salzmann, Marc

    2016-06-01

    Global climate models simulate a robust increase of global mean precipitation of about 1.5 to 2% per kelvin surface warming in response to greenhouse gas (GHG) forcing. Here, it is shown that the sensitivity to aerosol cooling is robust as well, albeit roughly twice as large. This larger sensitivity is consistent with energy budget arguments. At the same time, it is still considerably lower than the 6.5 to 7% K(-1) decrease of the water vapor concentration with cooling from anthropogenic aerosol because the water vapor radiative feedback lowers the hydrological sensitivity to anthropogenic forcings. When GHG and aerosol forcings are combined, the climate models with a realistic 20th century warming indicate that the global mean precipitation increase due to GHG warming has, until recently, been completely masked by aerosol drying. This explains the apparent lack of sensitivity of the global mean precipitation to the net global warming recently found in observations. As the importance of GHG warming increases in the future, a clear signal will emerge.

  5. Global Warming without Global Mean Precipitation Increase?

    Science.gov (United States)

    Salzmann, Marc

    2017-04-01

    Global climate models simulate a robust increase of global mean precipitation of about 1.5 to 2% per kelvin surface warming in response to greenhouse gas (GHG) forcing. Here, it is shown the sensitivity to aerosol cooling is robust as well, albeit roughly twice as large (3-4% per kelvin). This larger sensitivity is consistent with energy budget arguments. At the same time, it is still considerably lower than the 6.5 to 7%K-1 decrease of the water vapor concentration with cooling from anthropogenic aerosol since the water vapor radiative feedback lowers the hydrological sensitivity to anthropogenic forcings. When GHG and aerosol forcings are combined, the climate models with a realistic 20th century warming indicate that the global mean hydrological response to GHG warming has until recently been completely masked by aerosol drying. This explains the apparent lack of sensitivity of the global mean precipitation to the net global warming recently found in observations. As the importance of GHGs increases in the future, a clear signal will emerge.

  6. Globalization of the sports economy

    OpenAIRE

    Wladimir Andreff

    2008-01-01

    Introduction – 1. Major features of a globalized sports economy – 2. International economic flows in a global sports economy – 3. Globalization as geographical spread of the sports economy – 4. Globalization of professional sports – Conclusion – References

  7. Global Sourcing Flexibility

    DEFF Research Database (Denmark)

    Ørberg Jensen, Peter D.; Petersen, Bent

    2013-01-01

    sourcing flexibility. Here we draw on prior research in the fields of organizational flexibility, international business and global sourcing as well as case examples and secondary studies. In the second part of the paper, we discuss the implications of global sourcing flexibility for firm strategy......Recent studies show that flexibility is a key concern for firms that engage in the global sourcing of services. In this conceptual paper, we seek to explore two central aspects of global sourcing flexibility: In the first part of the paper, we provide a definition of the construct of global...... and operations against the backdrop of the theory-based definition of the construct. We discuss in particular the importance of global sourcing flexibility for operational performance stability, and the trade-off between specialization benefits, emerging from location and service provider specialization, versus...

  8. Information Global Marketing Management

    Directory of Open Access Journals (Sweden)

    Aleksandar Grubor

    2010-12-01

    Full Text Available Global marketing management needs to be implemented based on valid, i.e. reliable, timely, verifiable and high-quality marketing information, which will enable valid decision-making in global business operations. The efficiency and effectiveness of decision-making is directly related to considering the comprehensive state of the chosen segment(s of the global market. Informational completion of the picture of a market requires devising and implementing a large number of activities set in a logical sequence. Practical experience has shown that decision-making in managing global business activities of affirmed companies is based on accumulated knowledge and is regarded as a specific form of creativity, unlike operationalization and supervision, which are mostly organizational and technical issues. Bearing this in mind, the informational basis in the operation of global companies should be viewed in accordance with its significance and function in global marketing management.

  9. Globalization, culture and psychology.

    Science.gov (United States)

    Melluish, Steve

    2014-10-01

    This article outlines the cultural and psychological effects of globalization. It looks at the impact of globalization on identity; ideas of privacy and intimacy; the way we understand and perceive psychological distress; and the development of the profession of psychology around the world. The article takes a critical perspective on globalization, seeing it as aligned with the spread of neoliberal capitalism, a tendency towards cultural homogenization, the imposition of dominant 'global north' ideas and the resultant growing inequalities in health and well-being. However, it also argues that the increased interconnectedness created by globalization allows for greater acknowledgement of our common humanity and for collective efforts to be developed to tackle what are increasingly global problems. This requires the development of more nuanced understandings of cultural differences and of indigenous psychologies.

  10. Global warming without global mean precipitation increase?

    OpenAIRE

    Salzmann, Marc

    2016-01-01

    Global climate models simulate a robust increase of global mean precipitation of about 1.5 to 2% per kelvin surface warming in response to greenhouse gas (GHG) forcing. Here, it is shown that the sensitivity to aerosol cooling is robust as well, albeit roughly twice as large. This larger sensitivity is consistent with energy budget arguments. At the same time, it is still considerably lower than the 6.5 to 7% K−1 decrease of the water vapor concentration with cooling from anthropogenic aeroso...

  11. Governing Global Migration

    OpenAIRE

    2008-01-01

    This study explores the global regulative function of migration politics. Its main aim is to rethink migration politics through an engagement with the Foucauldian governmentality perspective, which focuses on the relation between government and thought. A secondary aim is to use this perspective to explore the global description of migration and migration politics which is emerging with the currently evolving global governance of migration. Doing so, it wishes to contribute both to the study ...

  12. Managing Global Teams

    Directory of Open Access Journals (Sweden)

    Anca Stan

    2010-12-01

    Full Text Available Every global company’s competitive advantage depends on its ability to coordinate critical resources and information that are spread across different geographical locations. As a result of the increasingly global business environment, many companies are building teams that cross- national borders and / or include members from different countries of origin. Global teams are formed to enhance the efficiency of an organization by making effective use of the diversity or viewpoints.

  13. Salud y justicia global

    Directory of Open Access Journals (Sweden)

    Puyol, Ángel

    2010-12-01

    Full Text Available A question that would have to worry more to the global justice is the huge inequality of health in the world. In this paper, I analyse the causes of the global inequality of health and the ethical arguments for and against the need to treat this inequality from the perspective of the global justice. After refusing the arguments against both of the libertarianism and the statism, and after showing the critics both to the approach to the language of human rights and to the poggean proposal to reduce the duties of global justice to negative moral duties, I defend the need to use a sufficiency approach to global justice based in positive moral duties to face the severity and the moral urgency of the global inequalities of health.

    Una de las cuestiones que debería preocupar más a la teoría de la justicia global es la enorme desigualdad de salud que hay en el mundo. En este artículo, se repasan las causas de la desigualdad global de salud y los argumentos éticos a favor y en contra de la necesidad de tratar dicha desigualdad desde la perspectiva de la justicia global. Tras rechazar los argumentos en contra tanto del libertarismo de derechas como del estatalismo, y tras exponer las críticas tanto al lenguaje de los derechos humanos como a la propuesta poggeana de reducir los deberes de la justicia global a deberes morales negativos, defiendo la necesidad de partir de un criterio de justicia global suficientista y basado en los deberes morales positivos para afrontar la gravedad y la urgencia moral que suponen las desigualdades globales de salud.

  14. Global atmospheric changes.

    OpenAIRE

    Piver, W T

    1991-01-01

    Increasing concentrations of CO2 and other greenhouse gases in the atmosphere can be directly related to global warming. In terms of human health, because a major cause of increasing atmospheric concentrations of CO2 is the increased combustion of fossil fuels, global warming also may result in increases in air pollutants, acid deposition, and exposure to ultraviolet (UV) radiation. To understand better the impacts of global warming phenomena on human health, this review emphasizes the proces...

  15. Globalization and Values

    OpenAIRE

    John WHALLEY

    2005-01-01

    This paper discusses a central element in globalization debate little addressed by economists, namely the interactions at global, national, and community levels between globalization and societally based values. Social values refer to wider notions of collective identity: religious values, attitudes towards materialism, moral beliefs, and a sense of collective awareness and are a broader and more encompassing concept than social capital discussed in recent economics and sociology literature. ...

  16. Global Reserve Cooperation

    Science.gov (United States)

    2011-03-24

    St ra te gy R es ea rc h Pr oj ec t GLOBAL RESERVE COOPERATION BY LIEUTENANT COLONEL PAMELA L. MCGAHA United States Army National Guard...DATES COVERED (From - To) 4. TITLE AND SUBTITLE Global Reserve Cooperation 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM...decade, the United States, its allies, and partner nations have greatly increased their reliance on Reserve Component forces. This global

  17. National Sovereignty Vs. Globalization

    Directory of Open Access Journals (Sweden)

    Michele Marsonet

    2017-01-01

    Globalization is frequently discussed as a counterpoint to national sovereignty. It is commonly asserted that globalization has eroded national sovereignty or that it has rendered borders obsolete. In particular, it is asserted that, in a globalized world economy, governments have no alternative but to adopt neoliberal economic policies of privatization, deregulation and reductions in public expenditure. However, in the contest between social democracy and neoliberal globalization, the nation—state per se is only marginally relevant. The crucial issue is whether policy will respond to the wishes of a democratic electorate, or be tightly constrained by the ‘Golden Straightjacket’ of international financial markets.

  18. Global from the Start

    DEFF Research Database (Denmark)

    Tanev, Stoyan

    2016-01-01

    This article provides insights from recent research on firms that are “born global”. A born-global firm is a venture launched to exploit a global niche from the first day of its operations. The insights in this article are relevant to technology entrepreneurs and top management teams of new...... technology firms. After discussing various definitions for the term “born global” and identifying the main characteristics of born-global firms, this article lists a few salient characteristics of firms that are born global in the technology sector. The article concludes by identifying opportunities...

  19. LIBERALISM AND GLOBALIZATION

    Directory of Open Access Journals (Sweden)

    SUCIU TITUS

    2013-02-01

    Full Text Available The paper presents the close connection that exists between liberalism and globalization. In the first part wemake a presentation of the historical evolution of liberalism, starting with the classical economic liberalism continuingwith the neo-classical liberalism emphasizing neo-liberalism and within the latter one, the monetarism. In the secondpart of the paper we present the concept of globalization considered both from an economic and from a social point ofview. Among the winners of globalization we notice the transnational companies and among the losers, the underqualifiedworkers. As a main conclusion we consider that globalization has brought about an increase in the social –economic inequities

  20. Global Delivery Models

    DEFF Research Database (Denmark)

    Manning, Stephan; Møller Larsen, Marcus; Bharati, Pratyush

    We investigate antecedents and contingencies of location configurations supporting global delivery models (GDMs) in global outsourcing. GDMs are a new form of IT-enabled client-specific investment promoting services provision integration with clients by exploiting client proximity and time......-zone spread allowing for 24/7 service delivery and access to resources. Based on comprehensive data we show that providers are likely to establish GDM configurations when clients value access to globally distributed talent pools and speed of service delivery, and in particular when services are highly...... commoditized. Findings imply that coordination across time zones increasingly affects international operations in business-to-business and born-global industries....

  1. Global electricity company profiles

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-12-31

    Global Electricity Company Profiles examines the operations and strategies of 60 of the leading electricity companies in the world. Through its analysis of the key players, the report provides a comprehensive review of the current state of the global electricity industry. Using electricity sales as its criteria, the most successful companies are compared in terms of their national, regional and global importance. Global Electricity Company Profiles provides an outline of each company, its structure and operations, as well as key financial data. The detailed performance benchmarking and review of expectations for future development for each individual company provide a wealth of invaluable strategic information not available elsewhere. (author)

  2. Local, Regional or Global?

    DEFF Research Database (Denmark)

    Geisler Asmussen, Christian

    This paper proposes a multidimensional index of regional and global orientation which can be used in confirmatory studies with econometric methodologies. Unlike extant measures, the index is objectively scaled and controls for home country orientation and market size differences. The index is shown...... in fact reflects strong home country biases.Keywords: globalization; regional integration; global strategy; regional strategy; local strategy; triad; liability of foreignness...... to be consistent with models of internationalization that incorporate different assumptions about strategic choice and global competition. Preliminary results show that large multinationals follow home region oriented internationalization paths, although much of the regional effect reported by previous studies...

  3. GLOBAL KEYNESIANISM AND BEYOND

    Directory of Open Access Journals (Sweden)

    Gernot Kohler

    2015-08-01

    Full Text Available Something like "global Keynesianism" or "transnational socialism" has been mentioned as a desirable alternative to global neoliberalism (Redmond 1997. However, a definition of this kind of global Keynesianism is hard to find. Many leftists tend to associate Keynesianism with corporate power. However, there are also numerous other leftists who view this differently. For example, a member of parliament for the German Green Party stated in a recent interview that "a reformist party today has to be a left-Keynesian party which contradicts the logic of capital" (Ebermann 1998. A number of scholars from several countries, including Canada, pursue post-Keynesian-ism, in the sense of left-Keynesian economics (e.g., Seccareccia 1991. How-ever, available left-Keynesian literature, as I see it, is lacking a world-system perspective. I am trying in this article to synthesize the two perspectives-namely, left-Keynesianism and world-system theory, leading to a perspective of global left-Keynesianism. This leftist global Keynesianism can, perhaps, be described as an approach to economics which emphasizes responsible public management of economic problems in a world-system context. Common themes in global Keynesianism include the importance of public management, democratic politics, the mixed economy, global income distribution, the management of global demand, investment and money, ecological sustainability and the importance of multiple levels of public management-local, national, regional and global.

  4. Globalization, Class and Culture in Global Systems

    Directory of Open Access Journals (Sweden)

    Jonathan Friedman

    2015-08-01

    Full Text Available The work of Immanuel Wallerstein has been criticized by certain anthropologists for not having taken culture into proper account. He has been accused of the sin of political economy, a not uncommon accusation, a re?ex of the 80’s and post-80’s anthropological jargon that might ?nally today be exhausted. Years earlier a number of social scientists were engaged in a critical assessment of the social sciences from a distinctively global perspective. Wallerstein, Frank and others were at the forefront of this critique which had a powerful impact on anthropology. The global perspective was not a mere addition to anthropological knowledge, not a mere of extension of the use of the culture concept, i.e. before it was local and now it is global, before culture stood still, but now in the global age, it ?ows around the world. It was a more fundamental critique, or at least it implied a more fundamental critique. This critique could only be attained from a perspective in which the very concept of society was re-conceived as something very different, as a locus constructed within a historical force ?eld which was very much broader than any particular politically de?ned unit.

  5. "Global Competency" Is Imperative for Global Success

    Science.gov (United States)

    Reimers, Fernando

    2009-01-01

    According to a recent report of scenarios prepared by the National Intelligence Council, the next 15 years will bring significant global changes, including the transformation of the international political system built after World War II, a transfer of wealth from the West to the East, pressure on natural resources resulting from continuing…

  6. Future Global Cryosphere: Impacts of Global Warming

    Science.gov (United States)

    Gan, T. Y.; Barry, R. G.

    2014-12-01

    In recent years, the Earth is undergoing potentially rapid changes in all cryospheric components, including Arctic sea ice shrinkage, mountain glacier recession, thawing permafrost, diminishing snow cover, and accelerated melting of the Greenland ice sheet. This has significant implications for global climate, hydrology, water resources, and global sea level. Physical evidences of changes observed in the cryosphere are: (a) Duration of ice cover of rivers and lakes in high latitudes of N. H. decreased by about two weeks over the 20th Century; (b) Significant retreat of glaciers world wide during the 20th Century; (c) Thinning of Arctic sea-ice extent and thickness by about 40% in late summer in recent decades, with the minimum sea ice concentration mapped by the SSM/I sensor of NASA in 2007; (d) Snow cover decreased in area by about 10% since global observations by satellites began in the late 1960s, in various places of the Northern Hemisphere; (e) In North America, snow water equivalent decreased by about 10mm since observations by passive microwave sensors began in the late 1970s; (f) Degradations of permafrost have been detected in some parts of the polar and sub-polar regions, and (g) The total 20th Century global average sea level rise was about 0.17m, likely due to decline in glaciers, snow, ice sheets, and losses from Greenland and Antarctica ice. Next, projected changes to the Cryosphere: northern hemisphere snow cover, avalanches, land ice, permafrost, freshwater ice, and sea ice changes, are presented.

  7. BUSINESS GLOBALIZATION: TRANSNATIONAL CORPORATIONS AND GLOBAL COMPETITION

    Directory of Open Access Journals (Sweden)

    DIMA Stela

    2013-06-01

    Full Text Available The purpose of this paper is to introduce business globalization and the main globalization factors which, under the current stage, are transnational corporations. Globalization is the result of the pressure put by companies which, in turn, are under the close “magnifier” of all the involved factors (the so-called “stakeholders”. The market and the determining forces are not influenced by a political attitude nowadays marking globalization, but rather the political decisions have followed the course of economic evolutions, a trend that has always been provided by multinational corporations. In order to successfully follow up their activity, companies initiate new businesses, selling or deleting from their portfolio businesses or divisions with a decreasing tendency. Also, companies give up old rules and structures adopting new decision-making processes, control systems and mental patterns. Corporations must learn to become dynamic just like the market, if they wish to maintain, on the long run, a superior rate of income.

  8. Editorial: Is global health really global?

    National Research Council Canada - National Science Library

    Peter Byass

    2013-01-01

    .... It accompanies a set of papers which were also presented at the conference. So far, these papers describe a range of global health issues, from the health status of the United Arab Emirates through to social determinants of health in India...

  9. 2007 status of climate change: Mitigation of Climate Change. Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Summary for Policy-makers; Bilan 2007 des changements climatiques: l'attenuation des changements climatiques. Contribution du Groupe de travail 3 au quatrieme rapport d'evaluation du Groupe d'Experts Intergouvernemental sur l'Evolution du Climat (GIEC). Resume a l'attention des decideurs

    Energy Technology Data Exchange (ETDEWEB)

    Barker, T.; Bashmakov, I.; Bernstein, L.; Bogner, J.; Bosch, P.; Dave, R.; Davidson, O.; Fisher, B.; Grubb, M.; Gupta, S.; Halsnaes, K.; Heij, B.; Kahn Ribeiro, S.; Kobayashi, S.; Levine, M.; Martino, D.; Masera Cerutti, O.; Metz, B.; Meyer, L.; Nabuurs, G.J.; Najam, A.; Nakicenovic, N.; Holger Rogner, H.; Roy, J.; Sathaye, J.; Schock, R.; Shukla, P.; Sims, R.; Smith, P.; Swart, R.; Tirpak, D.; Urge-Vorsatz, D.; Dadi, Z

    2007-07-01

    The Working Group III contribution to the IPCC Fourth Assessment Report (AR4) focuses on new literature on the scientific, technological, environmental, economic and social aspects of mitigation of climate change, published since the IPCC Third Assessment Report (TAR) and the Special Reports on CO{sub 2} Capture and Storage (SRCCS) and on Safeguarding the Ozone Layer and the Global Climate System (SROC).The main aim of this summary report is to assess options for mitigating climate change. Several aspects link climate change with development issues. This report explores these links in detail, and illustrates where climate change and sustainable development are mutually reinforcing. Economic development needs, resource endowments and mitigative and adaptive capacities differ across regions. There is no one-size-fits-all approach to the climate change problem, and solutions need to be regionally differentiated to reflect different socio-economic conditions and, to a lesser extent, geographical differences. Although this report has a global focus, an attempt is made to differentiate the assessment of scientific and technical findings for the various regions. Given that mitigation options vary significantly between economic sectors, it was decided to use the economic sectors to organize the material on short- to medium-term mitigation options. Contrary to what was done in the Third Assessment Report, all relevant aspects of sectoral mitigation options, such as technology, cost, policies etc., are discussed together, to provide the user with a comprehensive discussion of the sectoral mitigation options. The report is organised into six sections after the introduction: - Greenhouse gas (GHG) emission trends; - Mitigation in the short and medium term, across different economic sectors (until 2030); - Mitigation in the long-term (beyond 2030); - Policies, measures and instruments to mitigate climate change; - Sustainable development and climate change mitigation; - Gaps in

  10. Learning Democratic Global Governance.

    Science.gov (United States)

    Haavelsrud, Magnus

    1996-01-01

    Outlines a model process of developing knowledge from within different groups and cultures to allow more equitable participation of all world societies in the definition of global governance. Reviews concepts relevant to education's contributions toward learning and creating democratic global governance. Discusses the educational utility of…

  11. Global and European setting

    National Research Council Canada - National Science Library

    2014-01-01

    .... In the current quarter there are no signs of any departure from the moderate global upturn. Against the background of moderate global growth, the International Monetary Fund again revised its forecast for this year and the next downwards slightly in October, to 3.3% and 3.8% aggregated at purchasing power parities, respectively.

  12. Global Carbon Budget 2016

    NARCIS (Netherlands)

    Quéré, Le Corinne; Andrew, Robbie M.; Canadell, Josep G.; Sitch, Stephen; Korsbakken, Jan Ivar; Peters, Glen P.; Manning, Andrew C.; Boden, Thomas A.; Tans, Pieter P.; Houghton, Richard A.; Keeling, Ralph F.; Alin, Simone; Andrews, Oliver D.; Anthoni, Peter; Barbero, Leticia; Bopp, Laurent; Chevallier, Frédéric; Chini, Louise P.; Ciais, Philippe; Currie, Kim; Delire, Christine; Doney, Scott C.; Friedlingstein, Pierre; Gkritzalis, Thanos; Harris, Ian; Hauck, Judith; Haverd, Vanessa; Hoppema, Mario; Klein Goldewijk, Kees; Jain, Atul K.; Kato, Etsushi; Körtzinger, Arne; Landschützer, Peter; Lefèvre, Nathalie; Lenton, Andrew; Lienert, Sebastian; Lombardozzi, Danica; Melton, Joe R.; Metzl, Nicolas; Millero, Frank; Monteiro, Pedro M.S.; Munro, David R.; Nabel, Julia E.M.S.; Nakaoka, S.; O'Brien, Kevin; Olsen, Are; Omar, Abdirahman M.; Ono, Tsuneo; Pierrot, Denis; Poulter, Benjamin; Rödenbeck, Christian; Salisbury, Joe; Schuster, Ute; Schwinger, Jörg; Séférian, Roland; Skjelvan, Ingunn; Stocker, Benjamin D.; Sutton, Adrienne J.; Takahashi, Taro; Tian, Hanqin; Tilbrook, Bronte; Laan-Luijkx, van der Ingrid T.; Werf, van der Guido R.; Viovy, Nicolas; Walker, Anthony P.; Wiltshire, Andrew J.; Zaehle, Sönke

    2016-01-01

    Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere – the “global carbon budget” – is important to better understand the global carbon cycle, support the development of climate policies, and project futur

  13. Building Global Learning Communities

    Science.gov (United States)

    Cochrane, Thomas; Buchem, Ilona; Camacho, Mar; Cronin, Catherine; Gordon, Averill; Keegan, Helen

    2013-01-01

    Within the background where education is increasingly driven by the economies of scale and research funding, we propose an alternative online open and connected framework (OOC) for building global learning communities using mobile social media. We critique a three year action research case study involving building collaborative global learning…

  14. Globalization of the Semiosphere

    DEFF Research Database (Denmark)

    Hansen, Hans Lauge

    2005-01-01

    The article discusses the future perspectives for Foreign Language Studies in the era of Globalization. The intensified globalization processes are studied in the light of Yuri Lotmans concept of the semiosphere and the article advocates the development of a new philology of culture....

  15. Multiculturalism vs. Globalism.

    Science.gov (United States)

    Ukpokodu, Nelly

    1999-01-01

    Addresses the error of treating multiculturalism and globalism as the same concept. Considers the boundaries and shared purposes of multiculturalism and globalism. Defines the former as using multiple perspectives that reflect the diversity within a society and the latter as developing students' understanding of peoples and cultures of other…

  16. Globalism and HRD. Symposium.

    Science.gov (United States)

    2002

    This document contains three papers from a symposium on globalization and human resource development (HRD). "Challenges and Strategies of Developing Human Resources in the Surge of Globalization: A Case of the People's Republic of China" (De Zhang, Baiyin Yang, Yichi Zhang) analyzes the challenges and strategies of HRD in China and…

  17. Teaching Global Society.

    Science.gov (United States)

    Peet, Richard

    2002-01-01

    Describes the course, "Global Society," for first-year International Studies students at a Massachusetts liberal arts college. The course, which takes a historical approach, informs students about the nature, history, and present characteristics of the global system, taking theoretical, historical, and critical approaches that stress the…

  18. Translation as (Global) Writing

    Science.gov (United States)

    Horner, Bruce; Tetreault, Laura

    2016-01-01

    This article explores translation as a useful point of departure and framework for taking a translingual approach to writing engaging globalization. Globalization and the knowledge economy are putting renewed emphasis on translation as a key site of contest between a dominant language ideology of monolingualism aligned with fast capitalist…

  19. Simulating Global Climate Summits

    Science.gov (United States)

    Vesperman, Dean P.; Haste, Turtle; Alrivy, Stéphane

    2014-01-01

    One of the most persistent and controversial issues facing the global community is climate change. With the creation of the UN Framework Convention on Climate Change (UNFCCC) in 1992 and the Kyoto Protocol (1997), the global community established some common ground on how to address this issue. However, the last several climate summits have failed…

  20. The 2030 Global Agenda

    DEFF Research Database (Denmark)

    Enemark, Stig

    2016-01-01

    Sound land governance is fundamental to achieving the 2030 Global Agenda as set by the Sustainable. Development Goals (SDGs) adopted by all the world’s leaders at the UN Summit in September 2015. This Global Agenda calls for a “data revolution” for sustainable development to empower people...

  1. Simulating Global Climate Summits

    Science.gov (United States)

    Vesperman, Dean P.; Haste, Turtle; Alrivy, Stéphane

    2014-01-01

    One of the most persistent and controversial issues facing the global community is climate change. With the creation of the UN Framework Convention on Climate Change (UNFCCC) in 1992 and the Kyoto Protocol (1997), the global community established some common ground on how to address this issue. However, the last several climate summits have failed…

  2. Globalization of the Semiosphere

    DEFF Research Database (Denmark)

    Hansen, Hans Lauge

    2005-01-01

    The article discusses the future perspectives for Foreign Language Studies in the era of Globalization. The intensified globalization processes are studied in the light of Yuri Lotmans concept of the semiosphere and the article advocates the development of a new philology of culture....

  3. Globalization of Management Education

    Science.gov (United States)

    Bruner, Robert F.; Iannarelli, Juliane

    2011-01-01

    A new study, sponsored by the Association to Advance Collegiate Schools of Business, presented a comprehensive new perspective on the globalization of management education, (AACSB International, 2011). Its findings are sobering: with regard to emerging global trends in higher education and cross-border business, the report reveals a sizable gap…

  4. Managing Global Customers

    NARCIS (Netherlands)

    G.S. Yip (George)

    2009-01-01

    textabstractMultinational companies need to manage their relationships with multinational customers in a globally integrated approach. This paper provides a systematic framework for developing and implementing such global customer management programmes. The paper is based on Chapter 1 of George S. Y

  5. Becoming Global Players

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    As multinationals flock to China as a favorite investment destination, an increasing number of Chinese firms are also quickening their pace of going global.This is good news for the crisis-stricken target countries and the sluggish world economy. As they expand globally,

  6. Managing Global Customers

    NARCIS (Netherlands)

    G.S. Yip (George)

    2009-01-01

    textabstractMultinational companies need to manage their relationships with multinational customers in a globally integrated approach. This paper provides a systematic framework for developing and implementing such global customer management programmes. The paper is based on Chapter 1 of George S.

  7. European Integration and Globalization

    Directory of Open Access Journals (Sweden)

    Diana Bobica

    2010-06-01

    Full Text Available According to many, the term globalization is able to explain any phenomenon whatsoever, be it positive or negative, that takes place within the global social system. It seems like a sort of magical formula, which is to be found in the speeches of all sorts of people, be they economists, politicians, businessmen or sociologists. However this magical formula of globalization has its limitations, since it encompasses a certain amount of quibbling, beyond which not many can pass. In the context of globalization there appears the question on its role in the process of European integration. Is European integration a part of this global process or, quite on the contrary, does it present certain distinctive features, as it moulds itself differently from the globalization phenomenon? A clear-cut answer seems difficult because of the various aspects involved. Not only the general phenomenon of globalization, but also the economic integration on European level is based on the liberalization of markets and on the opening of national economies towards the exterior,having as direct consequence the intensification of trade exchanges. If from a global point of view one may talk of a market fundamentalism in that the market principles know no boundary, European integration on the other hand implies not only market economy, but also a guided and monitored action of Member Statesaccording to the needs of the whole entity, also taking into consideration - as far as possible – all aspects and consequences on social level.

  8. Global Carbon Budget 2016

    NARCIS (Netherlands)

    Le Quéré, C.; Andrew, R. M.; Canadell, J. G.; Sitch, S.; Korsbakken, J. I.; Peters, G. P.; Manning, A. C.; Boden, T. A.; Tans, P. P.; Houghton, R. A.; Keeling, R. F.; Alin, S.; Andrews, O. D.; Anthoni, P.; Barbero, L.; Bopp, L.; Chevallier, F.; Chini, L. P.; Ciais, P.; Currie, K.; Delire, C.; Doney, S. C.; Friedlingstein, P.; Gkritzalis, T.; Harris, I.; Hauck, J.; Haverd, V.; Hoppema, M.; Klein Goldewijk, K.; Jain, A. K.; Kato, E.; Körtzinger, A.; Landschützer, P.; Lefèvre, N.; Lenton, A.; Lienert, S.; Lombardozzi, D.; Melton, J. R.; Metzl, N.; Millero, F.; Monteiro, P. M. S.; Munro, D. R.; Nabel, J. E. M. S.; Nakaoka, S.-I.; O'Brien, K.; Olsen, A.; Omar, A. M.; Ono, T.; Pierrot, D.; Poulter, B.; Rödenbeck, C.; Salisbury, J.; Schuster, U.; Schwinger, J.; Séférian, R.; Skjelvan, I.; Stocker, B. D.; Sutton, A. J.; Takahashi, T.; Tian, H.; Tilbrook, B.; van der Laan-Luijkx, I. T.; van der Werf, G. R.; Viovy, N.; Walker, A. P.; Wiltshire, A. J.; Zaehle, S.

    2016-01-01

    Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere – the “global carbon budget” – is important to better understand the global carbon cycle, support the development of climate policies, and project futur

  9. Global Tuberculosis Report 2016

    Science.gov (United States)

    ... WHO Language عربي 中文 English Français Русский Español Tuberculosis (TB) Menu Tuberculosis The End TB Strategy Areas ... data News, events and features About us Global tuberculosis report 2016 WHO has published a global TB ...

  10. Den globale provins

    DEFF Research Database (Denmark)

    Gebauer, Mirjam

    2008-01-01

    »Den globale provins« gennemgår - med udgangspunkt i Ottmar Ettes begreb om at skrive mellem verdener - centrale værker fra denne migrationslitteratur. Ilija Trojanow kan med sin bulgarsk-sydafrikansk-østrigske baggrund beskrive en global verden mangfoldigt og komplekst, mens forfattere som Selim...

  11. Climatic change: is the truth at the bottom of the carbon sink?; Changement climatique: la verite est-elle au fond du puits?. Une analyse des controverses sur les puits de carbone

    Energy Technology Data Exchange (ETDEWEB)

    Localli, B. [Centre de Cooperation Internationale en Recherche Agronomique pour le Developpement, CIRAD Foret-Catie, Turrialba (Costa Rica); Loisel, C. [Office national des Forets, mission Effet de Serre expert Foret et Changement Climatique, 75 - Paris (France)

    2002-12-01

    This article presents the controversy about the concept of carbon sinks that was mentioned in the Kyoto protocol. A carbon sink is for instance an ecosystem that absorbs more carbon than it releases. A forest absorbs carbon during its growth period then reaches a level where the quantity of carbon absorbed equals the quantity of carbon emitted. In the case of a forest managed by man the mature stage is never reached since a forest is exploited and continuously renewed. The global balance of the forest depends greatly on the fate of the wood produced: if the wood is abandoned on the forest soil the balance is negative, on the contrary if the energetic valorization of the wood allows a reduction of the consumption of fossil fuels the balance is positive. In northern zones, a forest presents an albedo coefficient that is weaker than that of a barren zone, some climate models suggest that in this case the presence of the forest itself contributes directly to the earth warming in way that counterbalances by far the positive effects expected from the management of the forest. Opponents to carbon sinks also explain that carbon sinks could hamper or slow down efforts that have to be taken by public authorities to change their energy policies and to curb their energy consumption, which stays the great and real challenge. (A.C.)

  12. Global Value Trees

    Science.gov (United States)

    Zhu, Zhen; Puliga, Michelangelo; Cerina, Federica; Chessa, Alessandro; Riccaboni, Massimo

    2015-01-01

    The fragmentation of production across countries has become an important feature of the globalization in recent decades and is often conceptualized by the term “global value chains” (GVCs). When empirically investigating the GVCs, previous studies are mainly interested in knowing how global the GVCs are rather than how the GVCs look like. From a complex networks perspective, we use the World Input-Output Database (WIOD) to study the evolution of the global production system. We find that the industry-level GVCs are indeed not chain-like but are better characterized by the tree topology. Hence, we compute the global value trees (GVTs) for all the industries available in the WIOD. Moreover, we compute an industry importance measure based on the GVTs and compare it with other network centrality measures. Finally, we discuss some future applications of the GVTs. PMID:25978067

  13. Globalization of healthcare.

    Science.gov (United States)

    2012-05-01

    Globalization-the increasing transnational circulation of money, goods, people, ideas, and information worldwide-is generally recognized as one of the most powerful forces shaping our current and future history. How is it affecting healthcare, and in that context, what is the purpose and significance of Global Advances in Health and Medicine (GAHM), publisher of this journal? Our goal is not homogenization but rather to provide an opportunity for integration, convergence, and collaboration across cultures. By respecting and conserving the richness and diversity of each new medicine, we embrace globalization. Globalization is of course not new; it began in the Renaissance and particularly with the 15th- and 16th-century voyages of exploration by Columbus, Magellan, and others. Since the beginning of time, there have been interactions and exchanges among different peoples and cultures. However, the current magnitude of globalization is unprecedented and yet still expanding rapidly.

  14. Globalization as It Happens

    DEFF Research Database (Denmark)

    Flyverbom, Mikkel

    2012-01-01

    Globalization is usually understood as a structural, epochal condition altering the environment in which people, organizations, and societies operate. But such accounts offer little insight into the infrastructures, practices, and connections that facilitate the production of the global....... This article uses findings from an ethnographic study of tax planning to show how mundane practices and connectivities forge and organize global operations, and to argue for the value of analyzing processes of globalization in terms of assemblages and infrastructures. Empirically, the article captures how...... the making of ‘tax structures’ involves connecting, for instance, buildings in France, a human in Switzerland, a company in Denmark, various tax laws, a trust fund in New Zealand, and large amounts of money on the move. If studied along the lines of an analytics of ‘globalizing assemblages’, such financial...

  15. Requerimientos tecnológicos del transportador de laterita hacia el molino de bolas, de la Empresa Productora de Níquel Comandante Ernesto Guevara; Technological Requirements of the Conveyor Belt which Carries Laterite to the Balls Mill in Nickel Producer

    Directory of Open Access Journals (Sweden)

    Javier Muñoz Álvarez

    2011-02-01

    Full Text Available Se describe el flujo productivo existente en la Empresa Productora del Níquel Comandante Ernesto Guevara,hasta la etapa de la molienda seca, con énfasis en los detalles técnicos de mayor relevancia en el proceso.Se analiza la influencia de la cantidad de mineral en el sistema sobre el comportamiento energético de lamolienda. Finalmente se determinan los requerimientos tecnológicos impuestos por el transportador delaterita 215 - TR - 201 al accionamiento eléctrico, en función de las características y las necesidades delproceso. In the paper, the productive flow existing in the nickel producer enterprise Commandant Ernesto Guevarawas described until the stage of dry milling, with an emphasis on the technical details of greater relevancy inthe process. There was analyzed the influence of the amount of mineral in the system over the energyconsumption performance of the milling. Finally it were identified the technological requirements imposed bythe 215 - TR - 201 laterite carrier to the electric drive, according to the characteristics and needs of theprocess.

  16. Globalization and Health.

    Science.gov (United States)

    Martin, Greg

    2005-04-22

    This debut editorial of Globalization and Health introduces the journal, briefly delineating its goals and objectives and outlines its scope of subject matter. 'Open Access' publishing is expected to become an increasingly important format for peer reviewed academic journals and that Globalization and Health is 'Open Access' is appropriate. The rationale behind starting a journal dedicated to globalization and health is three fold:Firstly: Globalization is reshaping the social geography within which we might strive to create health or prevent disease. The determinants of health - be they a SARS virus or a predilection for fatty foods - have joined us in our global mobility. Driven by economic liberalization and changing technologies, the phenomenon of 'access' is likely to dominate to an increasing extent the unfolding experience of human disease and wellbeing.Secondly: Understanding globalization as a subject matter itself needs certain benchmarks and barometers of its successes and failings. Health is one such barometer. It is a marker of social infrastructure and social welfare and as such can be used to either sound an alarm or give a victory cheer as our interconnectedness hurts and heals the populations we serve.And lastly: In as much as globalization can have an effect on health, it is also true that health and disease has an effect on globalization as exemplified by the existence of quarantine laws and the devastating economic effects of the AIDS pandemic.A balanced view would propose that the effects of globalization on health (and health systems) are neither universally good nor bad, but rather context specific. If the dialogue pertaining to globalization is to be directed or biased in any direction, then it must be this: that we consider the poor first.

  17. Globalization and Health

    Directory of Open Access Journals (Sweden)

    Martin Greg

    2005-04-01

    Full Text Available Abstract This debut editorial of Globalization and Health introduces the journal, briefly delineating its goals and objectives and outlines its scope of subject matter. 'Open Access' publishing is expected to become an increasingly important format for peer reviewed academic journals and that Globalization and Health is 'Open Access' is appropriate. The rationale behind starting a journal dedicated to globalization and health is three fold: Firstly: Globalization is reshaping the social geography within which we might strive to create health or prevent disease. The determinants of health – be they a SARS virus or a predilection for fatty foods – have joined us in our global mobility. Driven by economic liberalization and changing technologies, the phenomenon of 'access' is likely to dominate to an increasing extent the unfolding experience of human disease and wellbeing. Secondly: Understanding globalization as a subject matter itself needs certain benchmarks and barometers of its successes and failings. Health is one such barometer. It is a marker of social infrastructure and social welfare and as such can be used to either sound an alarm or give a victory cheer as our interconnectedness hurts and heals the populations we serve. And lastly: In as much as globalization can have an effect on health, it is also true that health and disease has an effect on globalization as exemplified by the existence of quarantine laws and the devastating economic effects of the AIDS pandemic. A balanced view would propose that the effects of globalization on health (and health systems are neither universally good nor bad, but rather context specific. If the dialogue pertaining to globalization is to be directed or biased in any direction, then it must be this: that we consider the poor first.

  18. Is Carbon Offsetting an Elaborate Charade? Climate Change: the Mirage of Greenhouse Gas Emission Compensation Mechanisms; La compensation carbone: un marche de dupes? Changement climatique: le leurre des mecanismes de compensation des emissions de gaz a effet de serre

    Energy Technology Data Exchange (ETDEWEB)

    Fragniere, A. [Lausanne Univ., Institut de Politiques Territoriales et d' Environnement Humain (IPTEH) (Switzerland)

    2008-11-15

    There is now a massive scientific consensus around global warming and the subject is a major focus of media interest in most industrialized countries. The man-made origin of the phenomenon is also generally accepted; hence the efforts expended by those in government, the international community, environmental organizations etc. to limit its scope by acting on its main driver, greenhouse gas emissions. It is in this context that a market in the voluntary compensation of greenhouse gas emissions has developed in recent years. This is known as the ''voluntary carbon offsetting market'' and consists in selling activities or projects that are supposed, in the medium or long term, to reduce greenhouse gas emissions, thereby compensating for the climatically damaging effects of the purchasers' current activities. In other words, buyers may be said to be giving themselves a clear conscience about today's emissions by paying for an act of emission-reduction tomorrow. Though the principle may seem praiseworthy, on closer inspection the idea of carbon offsetting, as currently on offer, turns out to be deceptive. Augustin Fragniere demonstrates the point here with a precise analysis of the estimates and forecasts available in this field (showing how disputable the up-front emissions assessments are), and also of the spatial and temporal dimensions that are very largely concealed by the players in the carbon offsetting market. He shows, lastly, that carbon offsetting mechanisms lead to action being postponed, with an aggravation of the harm done and an increased need for action in the future as a consequence, whereas concrete initiatives to promote behavioural change in the present would have both quicker and clearer effects on the reduction of greenhouse gas emissions.

  19. Global Health 2011%Global Health2011

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    BMJ Group and NICE International have joined forces to co- host a unique two day conference on policies for sustainable and effective healthcare.Taking place on 29 and 30 September 2011 at BMA House in London,Global Health 2011 will bring together experts from around the world to discuss and promote cost effective and evidence informed policy making as a means to improve health outcomes.

  20. Chinese Entrepreneurs Go Global

    Directory of Open Access Journals (Sweden)

    Daniel Zhou

    2012-02-01

    Full Text Available China may be on the tipping point of explosive global growth. In response to changes in the global economy and an economic slowdown domestically, hundreds of thousands of Chinese SMEs are being encouraged to “go global” by their central and local governments. To a Chinese company, going global requires the expansion of its existing business in other countries or the development of new ventures with partners operating in other countries. Explosive growth in China may be possible, but it will depend on an appropriate strategy for going global. For a country that has firmly established itself as an international manufacturing hub, going global requires a shift in its entrepreneurial capacity, which is the focus of this article. We first assess the current situation in China to understand its current entrepreneurial focus and capacity, as well as the impetus for change. Next, we contrast the Kirznerian and Schumpeterian views of entrepreneurship to illustrate that – to go global – Chinese entrepreneurs must shift from an emphasis on exploiting pricing inefficiencies (i.e., Kirznerian entrepreneurship to an emphasis on innovation (i.e., Schumpeterian entrepreneurship. Finally, we examine unique characteristics of the business environment and culture in China, which are likely to impact the ability of Chinese entrepreneurs to go global.

  1. How global brands compete.

    Science.gov (United States)

    Holt, Douglas B; Quelch, John A; Taylor, Earl L

    2004-09-01

    It's time to rethink global branding. More than two decades ago, Harvard Business School professor Theodore Levitt argued that corporations should grow by selling standardized products all over the world. But consumers in most countries had trouble relating to generic products, so executives instead strove for global scale on backstage activities such as production while customizing product features and selling techniques to local tastes. Such "glocal" strategies now rule marketing. Global branding has lost more luster recently because transnational companies have been under siege, with brands like Coca-Cola and Nike becoming lightning rods for antiglobalization protests. The instinctive reaction of most transnational companies has been to try to fly below the radar. But global brands can't escape notice. In fact, most transnational corporations don't realize that because of their power and pervasiveness, people view them differently than they do other firms. In a research project involving 3,300 consumers in 41 countries, the authors found that most people choose one global brand over another because of differences in the brands'global qualities. Ratherthan ignore the global characteristics of their brands, firms must learn to manage those characteristics. That's critical, because future growth for most companies will likely come from foreign markets. Consumers base preferences on three dimensions of global brands--quality (signaled by a company's global stature); the cultural myths that brands author; and firms' efforts to address social problems. The authors also found that it didn't matter to consumers whether the brands they bought were American--a remarkable finding considering that the study was conducted when anti-American sentiment in many nations was on the rise.

  2. Democracy and Globality

    Directory of Open Access Journals (Sweden)

    Roland Axtmann

    2010-06-01

    Full Text Available In this article, I consider the connection between globalisation and democracy with respect of (1 the historical ‘waves’ of democratisation and the (global spread of ‘democratic’ system of political rule, and (2 the debate on a reformulation of democratic rule ‘in the age of globalisation’, and the concerns with global civil society, global governance and ‘cosmopolitan democracy’ in particular. Linking these two parts are considerations of the question as to whether a universal entitlement to democratic governance is emerging as a right in international law.

  3. Global Software Engineering

    DEFF Research Database (Denmark)

    Ebert, Christof; Kuhrmann, Marco; Prikladnicki, Rafael

    2016-01-01

    Professional software products and IT systems and services today are developed mostly by globally distributed teams, projects, and companies. Successfully orchestrating Global Software Engineering (GSE) has become the major success factor both for organizations and practitioners. Yet, more than...... and experience reported at the IEEE International Conference on Software Engineering (ICGSE) series. The outcomes of our analysis show GSE as a field highly attached to industry and, thus, a considerable share of ICGSE papers address the transfer of Software Engineering concepts and solutions to the global stage...

  4. Developing Global Transformational Leaders

    DEFF Research Database (Denmark)

    Ramsey, Jase R.; Rutti, Raina M.; Lorenz, Melanie P.

    2016-01-01

    Despite significant increases in training and development of global managers, little is known about the precursors of transformational leadership in Multilatinas. While prior cross-cultural literature suggests that being an autocratic leader is ideal in Multilatinas, using transformational...... of transformational leadership because they are better able to understand the differences of other cultures, and appropriately adjust their behavior....... leadership theory, we argue that global leaders of Multilatinas embrace a more humanistic approach to leadership because of the importance of relationships between leaders and their followers. Additionally, we argue that global leaders with high levels of cultural intelligence will have high levels...

  5. Global resource sharing

    CERN Document Server

    Frederiksen, Linda; Nance, Heidi

    2011-01-01

    Written from a global perspective, this book reviews sharing of library resources on a global scale. With expanded discovery tools and massive digitization projects, the rich and extensive holdings of the world's libraries are more visible now than at any time in the past. Advanced communication and transmission technologies, along with improved international standards, present a means for the sharing of library resources around the globe. Despite these significant improvements, a number of challenges remain. Global Resource Sharing provides librarians and library managers with a comprehensive

  6. Dilatonic global strings

    Science.gov (United States)

    Dando, Owen; Gregory, Ruth

    1998-07-01

    We examine the field equations of a self-gravitating global string in low energy superstring gravity, allowing for an arbitrary coupling of the global string to the dilaton. Massive and massless dilatons are considered. For the massive dilaton the spacetime is similar to the recently discovered non-singular time-dependent Einstein self-gravitating global string, but the massless dilaton generically gives a singular spacetime, even allowing for time dependence. We also demonstrate a time-dependent non-singular string-antistring configuration, in which the string pair causes a compactification of two of the spatial dimensions, albeit on a very large scale.

  7. Dilatonic global strings

    CERN Document Server

    Dando, O; Dando, Owen; Gregory, Ruth

    1998-01-01

    We examine the field equations of a self-gravitating global string in low energy superstring gravity, allowing for an arbitrary coupling of the global string to the dilaton. Massive and massless dilatons are considered. For the massive dilaton the spacetime is similar to the recently discovered non-singular time-dependent Einstein self-gravitating global string, but the massless dilaton generically gives a singular spacetime, even allowing for time-dependence. We also demonstrate a time-dependent non-singular string/anti-string configuration, in which the string pair causes a compactification of two of the spatial dimensions, albeit on a very large scale.

  8. Global Software Engineering

    DEFF Research Database (Denmark)

    Ebert, Christof; Kuhrmann, Marco; Prikladnicki, Rafael

    2016-01-01

    Professional software products and IT systems and services today are developed mostly by globally distributed teams, projects, and companies. Successfully orchestrating Global Software Engineering (GSE) has become the major success factor both for organizations and practitioners. Yet, more than...... and experience reported at the IEEE International Conference on Software Engineering (ICGSE) series. The outcomes of our analysis show GSE as a field highly attached to industry and, thus, a considerable share of ICGSE papers address the transfer of Software Engineering concepts and solutions to the global stage...

  9. Global Delivery Models

    DEFF Research Database (Denmark)

    Manning, Stephan; Møller Larsen, Marcus; Bharati, Pratyush

    We investigate antecedents and contingencies of location configurations supporting global delivery models (GDMs) in global outsourcing. GDMs are a new form of IT-enabled client-specific investment promoting services provision integration with clients by exploiting client proximity and time......-zone spread allowing for 24/7 service delivery and access to resources. Based on comprehensive data we show that providers are likely to establish GDM configurations when clients value access to globally distributed talent pools and speed of service delivery, and in particular when services are highly...

  10. Global Delivery Models

    DEFF Research Database (Denmark)

    Manning, Stephan; Møller Larsen, Marcus; Bharati, Pratyush M.

    2015-01-01

    Global delivery models (GDMs) are transforming the global IT and business process outsourcing industry. GDMs are a new form of client-specific investment promoting service integration with clients by combining client proximity with time-zone spread for 24/7 service operations. We investigate...... antecedents and contingencies of setting up GDM structures. Based on comprehensive data we show that providers are likely to establish GDM location configurations when clients value access to globally distributed talent and speed of service delivery, in particular when services are highly commoditized...

  11. Global Account Management

    DEFF Research Database (Denmark)

    Hollensen, Svend; Wulff, Vlad Stefan

    2012-01-01

    Global account management (GAM) has become a critical issue for many multinational corporations that compete in a fast changing global market environment. In this article, we approach GAM from a benchlearning perspective, synthesize selected literature and examine case studies in order to underline...... the importance of multilevel relationships in strategic business-to-business relationships. The purpose of this study is to address various issues related to multilevel relationships in strategic partnerships (e.g. the recruitment of the global account manager and his supporting team, turf wars and compensation...

  12. Global Account Management

    DEFF Research Database (Denmark)

    Hollensen, Svend; Wulff, Vlad Stefan

    2012-01-01

    Global account management (GAM) has become a critical issue for many multinational corporations that compete in a fast changing global market environment. In this article, we approach GAM from a benchlearning perspective, synthesize selected literature and examine case studies in order to underline...... the importance of multilevel relationships in strategic business-to-business relationships. The purpose of this study is to address various issues related to multilevel relationships in strategic partnerships (e.g. the recruitment of the global account manager and his supporting team, turf wars and compensation...

  13. Global Value Chain Configuration

    DEFF Research Database (Denmark)

    Hernandez, Virginia; Pedersen, Torben

    2017-01-01

    This paper reviews the literature on global value chain configuration, providing an overview of this topic. Specifically, we review the literature focusing on the concept of the global value chain and its activities, the decisions involved in its configuration, such as location, the governance...... modes chosen and the different ways of coordinating them. We also examine the outcomes of a global value chain configuration in terms of performance and upgrading. Our aim is to review the state of the art of these issues, identify research gaps and suggest new lines for future research that would...

  14. Technology and Global Change

    Science.gov (United States)

    Grübler, Arnulf

    2003-10-01

    Technology and Global Change describes how technology has shaped society and the environment over the last 200 years. Technology has led us from the farm to the factory to the internet, and its impacts are now global. Technology has eliminated many problems, but has added many others (ranging from urban smog to the ozone hole to global warming). This book is the first to give a comprehensive description of the causes and impacts of technological change and how they relate to global environmental change. Written for specialists and nonspecialists alike, it will be useful for researchers and professors, as a textbook for graduate students, for people engaged in long-term policy planning in industry (strategic planning departments) and government (R & D and technology ministries, environment ministries), for environmental activists (NGOs), and for the wider public interested in history, technology, or environmental issues.

  15. Global reach and engagement

    Science.gov (United States)

    2016-09-01

    Popular culture reflects both the interests of and the issues affecting the general public. As concerns regarding climate change and its impacts grow, is it permeating into popular culture and reaching that global audience?

  16. Forging a Global Alliance

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    G8 industrialized nations look to developing countries for help in an effort to tackle global challenges changes are coming to the Group of Eight (G8). For decades, major industrialized countries have called the shots in international institutions.

  17. Global Role of ASEAN

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ Nowadays, with continued globalization, it is almost essential for countries that are close to each other both geologically and culturally, to combine their interests in order to raise their competitiveness,and seek mutual gain.

  18. Global Hydrology Research Center

    Data.gov (United States)

    National Aeronautics and Space Administration — The GHRC is the data management and user services arm of the Global Hydrology and Climate Center. It encompasses the data and information management, supporting...

  19. Global Synoptic Climatology Network

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Global Synoptic Climatology Network is a digital data set archived at the National Climatic Data Center (NCDC). This record combines the various types of data that...

  20. Globalization and Productivity

    DEFF Research Database (Denmark)

    Hayakawa, Kazunobu; Machikita, Tomohiro

    2012-01-01

    Recent empirical studies which utilize plant- or establishment-level data to examine globalization's impact on productivity have discovered many causal mechanisms involved in globalization's impact on firms’ productivity. Because these pathways have been broad, there have been few attempts...... to summarize the several and detailed mechanisms of self-selection and learning at the same time. This paper examines seven pathways so that the clear-cut consequences of the broad picture of globalization become visible. This strategy is useful for detecting missing links within and across the existing...... studies as well as for finding possible synergy effects among different mechanisms. Insightful policy implications may be derived from the comprehensive comparisons between the seven different pathways of globalization....

  1. Weaving A Global Network

    Institute of Scientific and Technical Information of China (English)

    Zhou Zengpin

    2007-01-01

    @@ In recent years, private enterprises have Increasingly become a major economic force in China. As such businesses grow, the revenue from the international business that they conduct grows accordingly. China's private enterprises are going global.

  2. China Welcomes Global Investment

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    China is making an effort to building a fair market to attract overseas investment,China’s vice-premier told the gathering of CEOs in Beijing, adding that the meeting with its influence,will promote global business cooperation.

  3. Pathways to Global Markets

    DEFF Research Database (Denmark)

    Smith, David E.; Mitry, Darryl J.

    2011-01-01

    For marketing and economic researchers, an important aspect of globalization is the degree to which various consumer behavior dimensions and consumption patterns in different parts of the world are becoming similar, and how multinational companies have identified pathways to global success....... An important case study is McDonald‘s corporation, the world‘s largest fast food restaurant chain. This company has employed divergent marketing and economic strategies in both domestic and the international markets to become a leader in the global marketplace. An overview of the company‘s background......, organizational structures, mission and vision illustrate McDonald‘s strategic focus on its proactive evolution from a small drive-through operation to a global fast-food giant. The strategy is based on its ability to adapt to the cultural differences of the markets that McDonald‘s serves while preserving its...

  4. Meeting global conservation challenges

    Science.gov (United States)

    2016-10-01

    Hot on the heels of last year's Sustainable Development Goals and the Paris Agreement, representatives from the global conservation community met to set the conservation agenda that will help to implement these targets.

  5. The Global Energy Challenge

    DEFF Research Database (Denmark)

    Connolly, David

    2011-01-01

    This report gives a brief overview of the global energy challenge and subsequently outlines how and where renewable energy could be developed to solve these issues. The report does not go into a lot of detail on these issues and hence, it is meant as an overview only. The report begins by outlining...... the causes of global climate change, concluding that energy-related emissions are the primary contributors to the problem. As a result, global energy production is analysed in more detail, discussing how it has evolved over the last 30 years and also, how it is expected to evolve in the coming 30 years....... Afterwards, the security of the world’s energy supply is investigated and it becomes clear that there is both an inevitable shortage of fossil fuels and a dangerous separation of supply and demand. The final topic discussed is renewable energy, since it is one sustainable solution to the global energy...

  6. Global Land Survey

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The Global Land Survey (GLS) datasets are a collection of orthorectified, cloud-minimized Landsat-type satellite images, providing near complete coverage of the...

  7. Global Climate Summaries

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Global Hourly Summaries are simple indicators of observational normals which include climatic data summarizations and frequency distributions. These typically...

  8. Global Volcano Locations Database

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NGDC maintains a database of over 1,500 volcano locations obtained from the Smithsonian Institution Global Volcanism Program, Volcanoes of the World publication. The...

  9. Global Economic Review

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The growth of the global economy slowed in 2005 after sizzling expansion the previous year. According to the forecast of the International Monetary Fund (IMF) in September 2005, the growth rate of the global economy in 2005 would drop to 4.3 percent from 5.1 percent in 2004. Although the IMF said in December it would raise its prediction, sources estimated that the adjusted rate would hardly surpass 4.6 percent. Despite

  10. Global Liquidity Trap

    OpenAIRE

    Fujiwara, Ippei; NAKAJIMA Tomoyuki; Sudo, Nao; Teranishi, Yuki

    2011-01-01

    In this paper we consider a two-country New Open Economy Macroeconomics model, and analyze the optimal monetary policy when countries cooperate in the face of a "global liquidity trap" -- i.e., a situation where the two countries are simultaneously caught in liquidity traps. The notable features of the optimal policy in the face of a global liquidity trap are history dependence and international dependence. The optimality of history dependent policy is confirmed as in local liquidity trap. A ...

  11. Understanding global security

    OpenAIRE

    Hough, Peter

    2013-01-01

    Fully revised to incorporate recent developments, this third edition of Understanding Global Security analyzes the variety of ways in which peoples lives are threatened and / or secured in contemporary global politics. The traditional focus of Security Studies texts: war, deterrence and terrorism are analyzed alongside non-military security issues such as famine, crime, disease, disasters, environmental degradation and human rights abuses to provide a comprehensive survey of how and why peopl...

  12. UNDERSTANDING THE GLOBAL COMMONS

    OpenAIRE

    Bromley, Daniel W.; Cochrane, Jeffrey A.

    1994-01-01

    We want to clarify the way in which we think about the global commons, particularly the problem of global warming caused by greenhouse gas emissions and tropical deforestation. We develop a policy framework in which the policy goal is the sustainability of the earth's ability to absorb greenhouse gases. The framework considers the unequal incidence of benefits and costs of particular policies. We identify several resource management regimes and suggest that management under a common property ...

  13. Global warming yearbook: 1998

    Energy Technology Data Exchange (ETDEWEB)

    Arris, L. [ed.

    1999-02-01

    The report brings together a year`s worth of global warming stories - over 280 in all - in one convenient volume. It provides a one-stop report on the scientific, political and industrial implications of global warming. The report includes: detailed coverage of negotiations on the Kyoto Protocol; scientific findings on carbon sources and sinks, coral bleaching, Antarctic ice shelves, plankton, wildlife and tree growth; new developments on fuel economy, wind power, fuel cells, cogeneration, energy labelling and emissions trading.

  14. Managing global virtual teams

    OpenAIRE

    Saarinen, Johanna

    2016-01-01

    Advances in technology-enabled communication and a constant search for economic advantage have led global organizations to rely on virtual collaboration. Together with rapid changes in working life, virtuality has also altered the context for leadership and has had a significant impact on the work of managers. This study addresses managerial work in global virtual teams. In my study, I give voice to the managers themselves with the aim of enhancing our understanding of what the work of virtua...

  15. Global Ocean Governance

    OpenAIRE

    Dorota Pyc

    2016-01-01

    This paper presents a few general comments on the effective global ocean governance (GOG). The Convention on the Law of the Sea (UNCLOS) establishes fundamental legal principles for the governance of the marine environment and its resources. Furthermore, in the context of GOG the international community is conscious that improving of global and regional cooperation ought to be in the mainstream of socio-economic and political discourse. Nowadays, the UNCLOS is not able to give an answer for a...

  16. Globalization vs National Sovereignty

    Science.gov (United States)

    2017-06-09

    of globalization, and the trends.13 Globalization is spreading an economic free-market to virtually every country in the world. The effects caused...states or people. What educational reform is necessary to teach the facts and allow people to develop their own opinions and not just teach opinions...guidelines and principles to prevent this from becoming a reality . If we are not careful and not continuously evaluating our environment and the

  17. Global Networks of Expertise

    DEFF Research Database (Denmark)

    Hansen, Annette Skovsted

    to global networks of expertise through alumni network structures created in the 1960s. One significant and often overlooked outcome of technical assistance and overseas capacity development programs is the inclusion of experts from the south. The paper shows how the Japanese bilateral programs adapted...... the multilateral framework initiated in the 1950s to make networks of expertise global by enabling South-South and South-North connections....

  18. Changement climatique et viticulture en Champagne : du constat actuel aux prévisions du modèle ARPEGE-Climat sur l’évolution des températures pour le XXIe siècle 

    Directory of Open Access Journals (Sweden)

    Gérard Beltrando

    2010-12-01

    Full Text Available Dans le vignoble de Champagne, le changement climatique, perceptible depuis la fin des années 1980, se manifeste par une tendance à la précocité des stades phénologiques et par une amélioration de la qualité des raisins vendangés. Mais cette évolution interpelle le milieu professionnel car, si elle se poursuit, elle pourrait devenir néfaste pour la qualité de la production de raisin (chaleur estivale trop importante, taux d’alcool élevé…. Afin d’apporter des éléments de réponse sur l’évolution des températures (moyennes et extrêmes quotidiens dans un contexte d’augmentation de la concentration en gaz à effet de serre, les données de température quotidiennes calculées par le modèle numérique ARPEGE-Climat (Retic de Météo-France sont validées par comparaison avec celles mesurées à Reims-Courcy sur la période 1950-2006. Puis, les simulations obtenues sur la période 2001-2100 par ce modèle sont analysées  pour les trois scénarios les plus couramment utilisés par l’IPCC [B1 (optimiste, A1B (intermédiaire, A2 (pessimiste]. Les résultats montrent une tendance non linéaire vers un réchauffement de l’air mais aussi une grande variabilité des températures d’un scénario à l’autre. A partir des années 2060, les modèles fournissent des prévisions de températures qui, auront  des répercussions majeures sur l’activité vitivinicole, surtout pour le scénario pessimiste (A2.In Champagne vineyard, Climate Change already observed since the end of 1980’s, showed by precocity of phenology as harvests and quality improvement of grapes. This temporal evolution calls out to wine growers because if this evolution continues, it could become harmful to grape production quality (summer heat waves, lack of water, high alcohol rate…. In the aim to find responses concerning temperature evolution (means and daily extremes in a context of  greenhouse concentration rise, daily temperature data

  19. Globalization and Science Education

    Science.gov (United States)

    Bencze, J. Lawrence; Carter, Lyn; Chiu, Mei-Hung; Duit, Reinders; Martin, Sonya; Siry, Christina; Krajcik, Joseph; Shin, Namsoo; Choi, Kyunghee; Lee, Hyunju; Kim, Sung-Won

    2013-06-01

    Processes of globalization have played a major role in economic and cultural change worldwide. More recently, there is a growing literature on rethinking science education research and development from the perspective of globalization. This paper provides a critical overview of the state and future development of science education research from the perspective of globalization. Two facets are given major attention. First, the further development of science education as an international research domain is critically analyzed. It seems that there is a predominance of researchers stemming from countries in which English is the native language or at least a major working language. Second, the significance of rethinking the currently dominant variants of science instruction from the perspectives of economic and cultural globalization is given major attention. On the one hand, it is argued that processes concerning globalization of science education as a research domain need to take into account the richness of the different cultures of science education around the world. At the same time, it is essential to develop ways of science instruction that make students aware of the various advantages, challenges and problems of international economic and cultural globalization.

  20. Globally Collaborative Experiential Learning

    Directory of Open Access Journals (Sweden)

    Takeshi UTSUMI

    2005-07-01

    Full Text Available ABSTRACT The Global University System (GUS [Utsumi, et al, 2003] is a worldwide initiative to create advanced telecommunications infrastructure for access to educational resources across national and cultural boundaries for global peace. GUS aims to create a worldwide consortium of universities to provide the underdeveloped world with access to 21st Century education via broadband Internet technologies. The aim is to achieve “education and healthcare for all,” anywhere, anytime and at any pace. The GUS works in the major regions of the globe with partnerships of higher education and healthcare institutions. Learners in these regions will be able to take their courses from member institutions around the world to receive a GUS degree. These learners and their professors from partner institutions will also form a global forum for exchange of ideas and information and for conducting collaborative research and development with emerging global GRID computer network technology. Globally Collaborative Environmental Peace Gaming (GCEPG project [Utsumi, 2003] with a globally distributed computer simulation system, focusing on the issue of environment and sustainable development in developing countries, is to train would-be decision-makers in crisis management, conflict resolution, and negotiation techniques basing on “facts and figures.” The GUS will supply game players from around the world.

  1. Global coordination: weighted voting

    Directory of Open Access Journals (Sweden)

    Jan-Erik Lane

    2014-03-01

    Full Text Available In order to halt the depletion of global ecological capital, a number of different kinds of meetings between Governments of countries in the world has been scheduled. The need for global coordination of environmental policies has become ever more obvious, supported by more and more evidence of the running down of ecological capital. But there are no formal or binding arrangements in sight, as global environmental coordination suffers from high transaction costs (qualitative voting. The CO2 equivalent emissions, resulting in global warming, are driven by the unstoppable economic expansion in the global market economy, employing mainly fossil fuel generated energy, although at the same time lifting sharply the GDP per capita of several emerging countries. Only global environmental coordination on the successful model of the World Band and the IMF (quantitative voting can stem the rising emissions numbers and stop further environmental degradation. However, the system of weighted voting in the WB and the IMF must be reformed by reducing the excessive voting power disparities, for instance by reducing all member country votes by the cube root expression.

  2. Globalization in Japan

    DEFF Research Database (Denmark)

    Roesgaard, Marie Højlund

    2014-01-01

    Abstract for Nichibunken Copenhagen Symposium August 2012 Globalization in Japan – the case of moral education. 日本とグローバル化 - 道徳教育の件 Marie H. Roesgaard, Department of Cross-Cultural and Regional Studies, University of Copenhagen. This paper attempts to trace the history of global influence on Japan......Abstract for Nichibunken Copenhagen Symposium August 2012 Globalization in Japan – the case of moral education. 日本とグローバル化 - 道徳教育の件 Marie H. Roesgaard, Department of Cross-Cultural and Regional Studies, University of Copenhagen. This paper attempts to trace the history of global influence...... adjusting to those of the global currents that cannot be ignored. Further, I would suggest that global, or at least Western, influence is not a new thing in regard to moral education in Japan. The paper will provide an historical overview of the development of moral education since Meiji times and focus...

  3. Global cancer research initiative

    Directory of Open Access Journals (Sweden)

    Richard R Love

    2010-05-01

    Full Text Available Richard R LoveThe Ohio State University Comprehensive Cancer Center, Columbus, OH, USAAbstract: Cancer is an increasing problem for low- and middle-income countries undergoing an epidemiologic transition from dominantly acute communicable disease to more frequent chronic disease with increased public health successes in the former domain. Progress against cancer in high-income countries has been modest and has come at enormous expense. There are several well-conceived global policy and planning initiatives which, with adequate political will, can favorably impact the growing global cancer challenges. Most financial resources for cancer, however, are spent on diagnosis and management of patients with disease in circumstances where specific knowledge about effective approaches is significantly limited, and the majority of interventions, other than surgery, are not cost-effective in resource-limited countries by global standards. In summary, how to intervene effectively on a global scale for the majority of citizens who develop cancer is poorly defined. In contrast to technology-transfer approaches, markedly increased clinical research activities are more likely to benefit cancer sufferers. In these contexts, a global cancer research initiative is proposed, and mechanisms for realizing such an effort are suggested.Keywords: breast cancer, research, global, international, low-income, middle-income

  4. Global health justice and governance.

    Science.gov (United States)

    Ruger, Jennifer Prah

    2012-01-01

    While there is a growing body of work on moral issues and global governance in the fields of global justice and international relations, little work has connected principles of global health justice with those of global health governance for a theory of global health. Such a theory would enable analysis and evaluation of the current global health system and would ethically and empirically ground proposals for reforming it to more closely align with moral values. Global health governance has been framed as an issue of national security, human security, human rights, and global public goods. The global health governance literature is essentially untethered to a theorized framework to illuminate or evaluate governance. This article ties global health justice and ethics to principles for governing the global health realm, developing a theoretical framework for global and domestic institutions and actors.

  5. Labourer: Globalement plus néfaste sur la vie du sol que les pesticides

    DEFF Research Database (Denmark)

    Hupin, Frédérique; Petersen, Søren O.; Krogh, Paul Henning

    2017-01-01

    Quels sont les impacts de l’application de produits phytosanitaires sur les populations de vers de terre et des autres organismes du sol ? Ces impacts sont-ils simples et directs ? Ou sont-ils influencés par le travail du sol et la fertilisation ? Des recherches menées à l’université d’Aarhus au ...

  6. Challenges of Agricultural Adaptation to Climate Change in Nigeria: a Synthesis from the Literature Les enjeux de l’adaptation agricole au changement climatique au Nigéria : synthèse de la littérature Retos de la adaptación agrícola al cambio climático en Nigeria: una síntesis de la literatura

    Directory of Open Access Journals (Sweden)

    Anselm A. Enete

    2010-12-01

    services, and encouragement for the formation of farmer groups.Le changement climatique est peut-être la menace environnementale la plus sérieuse qui pèse sur la lutte contre la faim, la malnutrition, les maladies et la pauvreté en Afrique, principalement en raison de son impact sur la productivité agricole. Cet article aborde les enjeux de l’adaptation agricole au changement climatique au Nigéria dans les catégories Faim et Pauvreté ; Financement de la recherche et du développement de technologies dans le secteur de l’agriculture ; Pratiques agricoles traditionnelles ; Libéralisation des échanges commerciaux et Développement du marché ; Politiques, Institutions et Biens publics ; et Informations et Capital humain. La population rurale, qui produit plus de 70 % des denrées alimentaires consommées au Nigéria, est extrêmement pauvre et doit faire face à la malnutrition et aux maladies. L’Etat, tout comme le secteur privé, qui devraient stimuler le secteur par le biais de politiques cohérentes de financements solides et du développement d’infrastructures, n’ont pas accordé au problème la priorité qu’il mérite. En outre, les bénéfices attendus de la libéralisation du commerce n’ont pas été répercutés sur les agriculteurs africains, ce qui n’est pas sans relation avec l’inefficacité du système des marchés locaux. Par ailleurs, les agriculteurs sont lents à modifier leurs pratiques agricoles, comme les feux de brousse, la déforestation et l’agriculture pluviale. Ils manquent de l’éducation, des informations et de la formation nécessaires pour s’adapter au changement climatique. Le gouvernement devrait non seulement décentraliser ses programmes sur la pauvreté / le VIH-SIDA et sur la recherche agricole (financement et activités mais aussi les rendre participatifs. En outre, différents éléments pourraient être mis en place : un cadre de politique agricole nationale explicite ; une planification des systèmes d

  7. Changements climatiques et variations du champ magnetique terrestre dans le sud de la Patagonie (Argentine) depuis 51 200 ans reconstitues a partir des proprietes magnetiques des sediments du lac Laguna Potrok Aike

    Science.gov (United States)

    Lise-Pronovost, Agathe

    magnetisation (MDFNRM). Full-vector comparison of the new paleomagnetic record with other records from southern South America, elsewhere in the Southern Hemisphere, as well as dipole field models and compilations reveal similar millennial-scale variability. The Laschamp geomagnetic excursion and possibly the Mono Lake as well as the Hilina Pali excursions are recorded and suggest the global nature of these events. Nevertheless comparison with the Lake Baikal and Biwa records located on the opposite side of the globe in Siberia and Japan respectively reveals a different behaviour at ca. 46000 cal BP in Laguna Potrok Aike and in southern South America, hinting at a non-dipolar origin. In the second chapter, rock-magnetic proxies of dust and wind intensity since 51200 cal BP are constructed. The combined use of rock magnetism and grain size data allowed identifying the median destructive field of the isothermal remanent magnetisation (MDFIRM) as best reflecting silt-sized magnetite typically transported by wind in suspension over short distances. The MDF IRM displays similar variability than other wind intensity proxies derived from marine and lacustrine sediments, peat bug and speleothem records from Patagonia since the last climatic transition and from the Southern Hemisphere since 51200 cal BP. In addition, estimation of the flux of magnetite to the lake, investigation of the grain size influence on magnetic susceptibility and comparison with distal Patagonian dust records from the Southern Ocean and Antarctica indicate that the magnetic susceptibility signal from Laguna Potrok Aike is a dust record at the multi-millennial scale. In the third chapter, rock-magnetic proxies of runoff events associated with extreme precipitation and permafrost melt since 51200 cal BP are presented. The runoff events are identified by the presence of high coercivity magnetic mineral (such as hematite and goethite) which its pedogenic origin is inferred from geological, limnological, stratigraphic

  8. European utilities. What are the advantages, limits and perspectives of the multi-utilities model?; Les utilities europeennes. Quels sont les atouts, les limites et les perspectives du modele multi-utilities?

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-01-01

    Since several years, the European utilities (public service companies) have started a movement of broadening of their offer. They now encompass the overall domain of collective services (mainly electricity, natural gas, wastes and water) to propose global offers. The European utilities also go deeper in their range of offers with the management of fluxes (fluid supplies), of services (energy) and the externalization of infrastructures (cogeneration unit, waste water treatment plants, etc..). The multi-utilities model (association of at least 2 collective services inside a same portfolio of activities) has become a standard. This strategic evolution, implemented since several years in Europe, has been possible thanks to regulation changes: opening of gas and electricity markets to competition, increase of environmental standard requirements, delegation of services. If the multi-utilities concept appears as attractive, several questions remain unanswered: what are the real synergies between collective service activities? Is the multi-utilities model viable? How to finance such a model? How to construct and commercialize global offers? What are the commercial and financial results of the multi-utilities model? What are the alternatives to this model? Which strategic future to the European utilities? This study makes a precise status of the European markets of collective services. It analyzes the strategy of the European groups which have adopted the multi-utilities model and shows the advantages and limits of this strategic model. The study includes an analysis of the financial performances of the 20 main European groups which allows to foresee two scenarios of mid-term evolution for this sector. (J.S.)

  9. Peopling Global Health

    Directory of Open Access Journals (Sweden)

    João Biehl

    2014-06-01

    Full Text Available The field of Global Health brings together a vastly diverse array of actors working to address pressing health issues worldwide with unprecedented financial and technological resources and informed by various agendas. While Global Health initiatives are booming and displacing earlier framings of the field (such as tropical medicine or international health, critical analyses of the social, political, and economic processes associated with this expanding field — an “open source anarchy” on the ground — are still few and far between. In this essay, we contend that, among the powerful players of Global Health, the supposed beneficiaries of interventions are generally lost from view and appear as having little to say or nothing to contribute. We make the case for a more comprehensive and people-centered approach and demonstrate the crucial role of ethnography as an empirical lantern in Global Health. By shifting the emphasis from diseases to people and environments, and from trickle-down access to equality, we have the opportunity to set a humane agenda that both realistically confronts challenges and expands our vision of the future of global communities.

  10. Globalization and Landscape Architecture

    Directory of Open Access Journals (Sweden)

    Robert R. Hewitt

    2014-02-01

    Full Text Available The literature review examines globalization and landscape architecture as discourse, samples its various meanings, and proposes methods to identify and contextualize its specific literature. Methodologically, the review surveys published articles and books by leading authors and within the WorldCat.org Database associated with landscape architecture and globalization, analyzing survey results for comprehensive conceptual and co-relational frameworks. Three “higher order” dimensions frame the review’s conceptual organization, facilitating the organization of subordinate/subtopical areas of interest useful for comparative analysis. Comparative analysis of the literature suggests an uneven clustering of discipline-related subject matter across the literature’s “higher order” dimensions, with a much smaller body of literature related to landscape architecture confined primarily to topics associated with the dispersion of global phenomena. A subcomponent of this smaller body of literature is associated with other fields of study, but inferentially related to landscape architecture. The review offers separate references and bibliographies for globalization literature in general and globalization and landscape architecture literature, specifically.

  11. Globalization in Japan

    DEFF Research Database (Denmark)

    Roesgaard, Marie Højlund

    2014-01-01

    Abstract for Nichibunken Copenhagen Symposium August 2012 Globalization in Japan – the case of moral education. 日本とグローバル化 - 道徳教育の件 Marie H. Roesgaard, Department of Cross-Cultural and Regional Studies, University of Copenhagen. This paper attempts to trace the history of global influence...... of development and discourse on morality, values and identity. I propose seeing the contents of moral education as a reaction to the challenges of globalization, as a reaction to the risks experienced in modern globalized society and to the anxiety born out of the challenges, ‘real’ or ‘imagined,’ perceived...... to be posed by globalization. I would suggest that a productive point of departure would be to look at initiatives concerning moral education as ‘gate-keeping’, where those in a position of influence try to safeguard what is considered basic and inalienable in Japanese culture and morality, while also...

  12. Global product as a result of globalization process

    OpenAIRE

    Wach, Krzysztof

    2003-01-01

    The paper elaborates on the process of global product creation. The author tries to define a global product. Basic product strategies on global market are described, among them: standardization, adaptation and diversification. Premises and conditions for product standardization as well as determiners of standardization and adaptation are quoted. Many examples of global product and its strategies are described.

  13. International negotiation methods on climatic risks, the limits of global incentives: Natural gas example. Procedures de negociation internationale sur les risques climatiques, les limites de la globalisation: etude autour d'un cas d'ecole, le gaz naturel

    Energy Technology Data Exchange (ETDEWEB)

    Hourcade, J.C.; Journe, V. (Centre National de la Recherche Scientifique (CNRS), 75 - Paris (France))

    The discussion on economic instruments for coordinating an international strategy for climatic risks prevention does not take sufficiently into account the importance of the relevant scientific controversies. These ones determine strongly the negotiation process for the settlement of such a system. We illustrate this point with the simple case of the natural gas whose superiority in terms of emission contents compared to the other fossil fuels, could be contested in case of too important CH[sub 4] releases. We show that the negotiation process cannot come to a positive end if the incentive system relies only on the price signal. This process can converge only if one thinks about the combination of various tools, namely technological norms and ad hoc funds for the renewal of transmission and distribution networks combined with tax systems. 17 refs., 6 tabs.

  14. THE EVOLUTION OF ECONOMIC GLOBALIZATION DURING THE CURRENT GLOBAL CRISIS

    Directory of Open Access Journals (Sweden)

    Sabina Tuca

    2013-12-01

    Full Text Available The current economic crisis constitutes a serious test for the process of globalization. The purpose of this study is to analyze the influence of the current global crisis on economic globalization. To assess the impact of the current crisis on economic globalization, this paper examines the KOF Index of Globalization, before and during the crisis. The findings generally support the idea that economic globalization has been, in fact, weakened, after the onset of the current crisis. However, there is evidence that suggest that economic globalization has resumed the upward trend that characterized it before the crisis. Despite the fact the global crisis has shaken the process of globalization, we cannot talk of an end of globalization, as some predictions have indicated.

  15. Innovative Born Globals

    DEFF Research Database (Denmark)

    Kraus, Sascha; Brem, Alexander; Muench, Miriam

    2017-01-01

    Internationalization is a hot topic in innovation management, whereby the phenomenon of “Born Globals” is still limited to research in the domains of Entrepreneurship and International Management. As business model design plays a key role for Born Globals, we link these two concepts. For this, we...... propose hypotheses about the influence of efficiency-centered and novelty-entered business model design on international firm performance. To test these hypotheses, we performed a quantitative survey with 252 founders of international companies in Germany, Switzerland and Liechtenstein. Additionally, we...... gained further insights through a case study analysis of 11 Born Globals. The results show that business model design matters to international firm performance and the business model design of Born Globals tends to be more efficiency-centered. Based on a multiple case study, we analyzed business models...

  16. When Globalization Hits Home

    DEFF Research Database (Denmark)

    Borrás, Susana; Haakonsson, Stine Jessen

    Lead firms are increasingly reorganizing their innovation activities into global innovation networks. Such reorganization has potentially major impact on their existing home-based innovation networks. Based on 31 interviews in four case studies of lead firms in the Danish food industry, the paper...... analyzes the dynamics of five key features of home-based innovation networks: 1) size of the national networks, 2) type of organization, 3) content of collaboration within the network, 4) concurrent globalization of organizations in the network, and 5) degree of formalization of network interactions....... The dynamics are generally differentiated according to the type of lead firm strategy, i.e. knowledge augmenting or knowledge exploiting. The qualitative and exploratory findings point towards some effects on national innovation networks. Hence, the paper concludes by hypothesizing that the globalization...

  17. Design for Global Markets

    DEFF Research Database (Denmark)

    Boztepe, Suzan

    2009-01-01

    In a global economy, no company can safely assume that their products will be accepted in foreign markets. One key issue is to understand and meet the latent needs of culturally diverse target markets. This book examines from a user perspective the issue of developing new products for global...... markets. Given that main goal of any design is to create value for users, Boztepe argues that the concept of user value could be a driving force in design decision-making regarding product development for global markets. Through interviews with women about their kitchen practices and observations...... framework to assists marketers, product designers and managers to deal with the complex issue of designing and tailoring products for local needs....

  18. The Flickering Global City

    Directory of Open Access Journals (Sweden)

    Eric Slater

    2015-08-01

    Full Text Available This article explores new dimensions of the global city in light of the correlation between hegemonic transition and the prominence of financial centers. It counterposes Braudel’s historical sequence of dominant cities to extant approaches in the literature, shifting the emphasis from a convergence of form and function to variations in history and structure. The marked increase of finance in the composition of London, New York and Tokyo has paralleled each city’s occupation of a distinct niche in world financial markets: London is the principal center of currency exchange, New York is the primary equities market, and Tokyo is the leader in international banking. This division expresses the progression of world-economies since the nineteenth century and unfolds in the context of the present hegemonic transition. By combining world-historical and city-centered approaches, the article seeks to reframe the global city and overcome the limits inherent in the paradigm of globalization.

  19. Global Operations Networks

    DEFF Research Database (Denmark)

    of global operations and operations strategy. This summative volume utilises the rich and diverse empirical foundation generated during the project activities in Denmark, Sweden and Finland. Chapters of the book are based on quantitative data and multiple case studies which the project partners have been......In the current context of global economic liberalisation and technological advancements, industrial companies are less likely to generate value in the traditional vertically integrated chain. Instead, they are doing so by means of elaborate cross-border and cross-organisational networks. As a rule......, these networks are configured on a global basis and consist of diverse and interdependent affiliates (linked both through ownership and non-equity relationships), which are engaged in an exchange of goods, services and information. The Scandinavian context is no exception to this trend. Nevertheless...

  20. Towards a global polity

    DEFF Research Database (Denmark)

    While "one world government" is not on the cards, the globalization of political life has progressed significantly over the last decades. Rather than adding on to existing theoretical frameworks such as the realist picture of international anarchy or the English School's "international society......", this volume starts out from the idea of the world as one interconnected political system and explores ways and perspectives to analyze it as such. The contributors examine central aspects of this emerging global polity such as the role of law, of networks and of civil society. They discuss key theoretical...... and meta-theoretical questions on how to analyze and theorize the global polity, what drives it forward, and whether it can be democratized....

  1. Developing Global Nurse Influencers.

    Science.gov (United States)

    Spies, Lori A

    2016-01-01

    How can universities create engaged citizens and global leaders? Each year, a select group of advanced practice nursing students at Baylor University Louise Herrington School of Nursing travel to Africa for a month-long clinical mission experience. Students work alongside local and missionary healthcare providers in a comprehensive Christian outreach to the community at a high-volume clinic. Creating rich learning experiences in a global setting in significant and sustainable ways is difficult, but intentionally focusing on what we are called to do and who we serve provides ballast for faculty and students. The success of the trip in preparing students to be global influencers is evident by the work graduates elect to do around the world, following graduation.

  2. Global Microbial Identifier

    DEFF Research Database (Denmark)

    Wielinga, Peter; Hendriksen, Rene S.; Aarestrup, Frank Møller

    2017-01-01

    microbial identifier (GMI) initiative, aims to build a database of whole microbial genome sequencing data linked to relevant metadata, which can be used to identify microorganisms, their communities and the diseases they cause. It would be a platform for storing whole genome sequencing (WGS) data......) will likely also enable a much better understanding of the pathogenesis of the infection and the molecular basis of the host response to infection. But the full potential of these advances will only transpire if the data in this area become transferable and thereby comparable, preferably in open......-source systems. There is therefore an obvious need to develop a global system of whole microbial genome databases to aggregate, share, mine and use microbiological genomic data, to address global public health and clinical challenges, and most importantly to identify and diagnose infectious diseases. The global...

  3. The global water cycle

    Science.gov (United States)

    Oki, Taikan; Entekhabi, Dara; Harrold, Timothy Ives

    The global water cycle consists of the oceans, water in the atmosphere, and water in the landscape. The cycle is closed by the fluxes between these reservoirs. Although the amounts of water in the atmosphere and river channels are relatively small, the fluxes are high, and this water plays a critical role in society, which is dependent on water as a renewable resource. On a global scale, the meridional component of river runoff is shown to be about 10% of the corresponding atmospheric and oceanic meridional fluxes. Artificial storages and water withdrawals for irrigation have significant impacts on river runoff and hence on the overall global water cycle. Fully coupled atmosphere-land-river-ocean models of the world's climate are essential to assess the future water resources and scarcities in relation to climate change. An assessment of future water scarcity suggests that water shortages will worsen, with a very significant increase in water stress in Africa. The impact of population growth on water stress is shown to be higher than that of climate change. The virtual water trade, which should be taken into account when discussing the global water cycle and water scarcity, is also considered. The movement of virtual water from North America, Oceania, and Europe to the Middle East, North West Africa, and East Asia represents significant global savings of water. The anticipated world water crisis widens the opportunities for the study of the global water cycle to contribute to the development of sustainability within society and to the solution of practical social problems.

  4. Global Software Engineering

    DEFF Research Database (Denmark)

    Ebert, Christof; Kuhrmann, Marco; Prikladnicki, Rafael

    2016-01-01

    SOFTWARE, LIKE ALL industry products, is the result of complex multinational supply chains with many partners from concept to development to production and maintenance. Global software engineering (GSE), IT outsourcing, and business process outsourcing during the past decade have showed growth...... rates of 10 to 20 percent per year. This instalment of Practitioner’s Digest summarizes experiences and guidance from industry to facilitate knowledge and technology transfer for GSE. It’s based on industry feedback from the annual IEEE International Conference on Global Software Engineering, which had...

  5. Global Networks of Expertise

    DEFF Research Database (Denmark)

    Hansen, Annette Skovsted

    and experts dispatched from the countries supplying foreign aid, this article focuses on professionals and experts originating in developing countries. The main argument is that the overseas training programs financed partly or completely by Japanese ODA have provided experts from developing countries access...... to global networks of expertise through alumni network structures created in the 1960s. One significant and often overlooked outcome of technical assistance and overseas capacity development programs is the inclusion of experts from the south. The paper shows how the Japanese bilateral programs adapted...... the multilateral framework initiated in the 1950s to make networks of expertise global by enabling South-South and South-North connections....

  6. Pathways to Global Markets

    DEFF Research Database (Denmark)

    Smith, David E.; Mitry, Darryl J.

    2011-01-01

    core competencies and branding. Development situations of the company‘s four geographic segments, North America, South America, Europe, and APMEA (Asia, Pacific, Middle East and Africa), are presented in order to fully understand how McDonald‘s influences and is influenced by its domestic and global....... An important case study is McDonald‘s corporation, the world‘s largest fast food restaurant chain. This company has employed divergent marketing and economic strategies in both domestic and the international markets to become a leader in the global marketplace. An overview of the company‘s background...

  7. Global building physics

    DEFF Research Database (Denmark)

    Rode, Carsten

    2013-01-01

    High ambitions are set for the building physics performance of buildings today. No single technology can achieve fulfilment of these ambitions alone. Integrated, multi-facetted solutions and optimization are necessary. A holistic, or ‘global’, technological perspective is needed, which includes all...... aspects of the building as defined in building engineering. We live in an international society and building solutions are developed across country borders. Building physics is a global theme. The International Association of Building Physics has global appeal. This brief article reports the keynote...

  8. Global Building Physics

    DEFF Research Database (Denmark)

    Rode, Carsten

    2012-01-01

    High ambitions are set for the building physics performance of buildings today. No single technology can achieve fulfilment of these ambitions alone. Integrated, multi-facetted solutions and optimization are necessary. A holistic, or “global”, technological perspective is needed, which includes all...... aspects of the building as defined in building engineering. We live in an international society and building solutions are developed across country borders. Building physics is a global theme. The International Association of Building Physics has global appeal. The keynote lecture and this brief paper...

  9. Disciplining Global Society

    Directory of Open Access Journals (Sweden)

    Tony Evans

    2007-06-01

    Full Text Available One of the puzzles of the current era is the divide between optimists and pessimists on the question of human rights. The prominence of human rights on the international political agenda sustains the optimist’s hopes for the future, while pessimists point to continued and widespread reports of civil, political, economic, social and cultural violations. This article looks at the tensions and apparent contradictions between these two approaches. Following a discussion on the construction of global human rights discourse(s, the article concludes that the pretensions of law act to mask the socioeconomic normative framework that acts to discipline global society.

  10. Disciplining Global Society

    Directory of Open Access Journals (Sweden)

    Tony Evans

    2007-12-01

    Full Text Available One of the puzzles of the current era is the divide between optimists and pessimists on the question of human rights. The prominence of human rights on the international political agenda sustains the optimist’s hopes for the future, while pessimists point to continued and widespread reports of civil, political, economic, social and cultural violations. This article looks at the tensions and apparent contradictions between these two approaches. Following a discussion on the construction of global human rights discourse(s, the article concludes that the pretensions of law act to mask the socioeconomic normative framework that acts to discipline global society.

  11. Global Scale Impacts

    CERN Document Server

    Asphaug, Erik; Jutzi, Martin

    2015-01-01

    Global scale impacts modify the physical or thermal state of a substantial fraction of a target asteroid. Specific effects include accretion, family formation, reshaping, mixing and layering, shock and frictional heating, fragmentation, material compaction, dilatation, stripping of mantle and crust, and seismic degradation. Deciphering the complicated record of global scale impacts, in asteroids and meteorites, will lead us to understand the original planet-forming process and its resultant populations, and their evolution in time as collisions became faster and fewer. We provide a brief overview of these ideas, and an introduction to models.

  12. Global Delivery Models

    DEFF Research Database (Denmark)

    Manning, Stephan; Larsen, Marcus M.; Bharati, Pratyush

    2013-01-01

    This article examines antecedents and performance implications of global delivery models (GDMs) in global business services. GDMs require geographically distributed operations to exploit both proximity to clients and time-zone spread for efficient service delivery. We propose and empirically show...... that service providers who differentiate based on speed of service delivery are likely to set up GDM structures, and that these structures positively affect deal renewal rates if speed is important for clients in selecting vendors. Findings imply that, as co-location becomes less necessary for providing...... digitalized services, time zones increasingly affect....

  13. Global product development

    DEFF Research Database (Denmark)

    Taylor, Thomas Paul; Ahmed-Kristensen, Saeema

    2016-01-01

    Selecting key performance indicators in conventional product development is a challenging task for project management and is compound by global product development. Informed from the findings of two in depth case studies conducted with large Danish manufacturing companies, in this paper we develop...... and test a framework that supports the selection of Leading and Lagging key performance indicators in global product development. The framework provides an alternative approach to design, select and document key performance indicators by incorporating a challenge-oriented approach to selection....

  14. Seeking Global Minima

    Science.gov (United States)

    Tajuddin, Wan Ahmad

    1994-02-01

    Ease in finding the configuration at the global energy minimum in a symmetric neural network is important for combinatorial optimization problems. We carry out a comprehensive survey of available strategies for seeking global minima by comparing their performances in the binary representation problem. We recall our previous comparison of steepest descent with analog dynamics, genetic hill-climbing, simulated diffusion, simulated annealing, threshold accepting and simulated tunneling. To this, we add comparisons to other strategies including taboo search and one with field-ordered updating.

  15. The global event system

    Energy Technology Data Exchange (ETDEWEB)

    Winans, J.

    1994-03-02

    The support for the global event system has been designed to allow an application developer to control the APS event generator and receiver boards. This is done by the use of four new record types. These records are customized and are only supported by the device support modules for the APS event generator and receiver boards. The use of the global event system and its associated records should not be confused with the vanilla EPICS events and the associated event records. They are very different.

  16. Global aphasia without hemiparesis.

    Science.gov (United States)

    Tranel, D; Biller, J; Damasio, H; Adams, H P; Cornell, S H

    1987-03-01

    Three patients acutely developed global aphasia, but did not manifest the typical accompanying right hemiparesis. Computed tomography and magnetic resonance imaging studies demonstrated that the patients had two discrete left hemisphere lesions, one in the anterior language cortices or language-related subcortical areas, and one in the posterior language cortices. Cerebral angiography showed that two patients had complete occlusion of the left internal carotid artery, and the third had an intraluminal "clot" in the supraclinoid portion of the left internal carotid, findings suggestive of an embolic etiology. Our cases indicate that global aphasia without hemiparesis predicts two discrete lesions and a particularly good recovery of speech and language.

  17. Deterministic Global Optimization

    CERN Document Server

    Scholz, Daniel

    2012-01-01

    This monograph deals with a general class of solution approaches in deterministic global optimization, namely the geometric branch-and-bound methods which are popular algorithms, for instance, in Lipschitzian optimization, d.c. programming, and interval analysis.It also introduces a new concept for the rate of convergence and analyzes several bounding operations reported in the literature, from the theoretical as well as from the empirical point of view. Furthermore, extensions of the prototype algorithm for multicriteria global optimization problems as well as mixed combinatorial optimization

  18. Globalization and infectious diseases.

    Science.gov (United States)

    Frenk, Julio; Gómez-Dantés, Octavio; Knaul, Felicia M

    2011-09-01

    This article discusses the nature of the health challenges created by globalization and proposes new forms of international cooperation to confront them. The discussion of global health challenges includes both the transfer of health risks, with an emphasis on infectious diseases, and the international dissemination of health opportunities, including the transfer of knowledge and technology. The authors argue that the health-related challenges and opportunities of an increasingly interdependent world demand new forms of international cooperation. The authors suggest the promotion of 3 elements that, in their essence, contain the idea of collaboration: exchange, evidence, and empathy.

  19. Perspektiver for global produktion

    DEFF Research Database (Denmark)

    Larsen, Lars Bjørn; Kaas-Pedersen, Carsten; Vesterager, Johan

    1998-01-01

    Denne artikel giver en kort præsentation af Globeman21 (Global Manufacturing in the 21st century), der er et interregionalt industrielt forskningsprojekt under IMS (Intelligent Manufacturing Systems) programmet. Den overordnede vision i Globeman21 er 'The future will see Manufacturing Globally...... Integrated across time and space'. Denne vision har initieret en forskning i ledelse og styring af fremtidens produktionsvirksomheder, hvor emner som extended enterprise, virtual enterprise, netværk, integration, product life cycle management, globalisering og anvendelse af IT, er centrale forskningsområder....

  20. Military Implications of Global Warming.

    Science.gov (United States)

    2007-11-02

    U.S. environmental issues also have important global implications. This paper analyzes current U.S. Policy as it pertains to global warming and climate...for military involvement to reduce global warming . Global warming and other environmental issues are important to the U.S. military. As the United