Phénomènes électriques sur une couche de glace fondante PDF Download
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Author: Marc Duchesne
Publisher: Presses Academiques Francophones
ISBN: 9783838172385
Category :
Languages : fr
Pages : 144
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Book Description
De la source d'energie exploitee jusqu'a la consommation de l'electricite il existe tout un reseau de transport constitue de pylones, d'isolateurs et de lignes de transmission. Or, ces reseaux, lorsqu'ils sont situes dans les regions a climat froid, se trouvent parfois exposes aux problemes lies au givrage atmospherique. En effet, une couche de glace peut s'accumuler sur les isolateurs. Lorsque cette couche fond en surface suite au rayonnement du soleil par exemple, une redistribution du champ electrique le long de l'isolateur peut entrainer l'apparition d'arcs electriques partiels, voir meme un contournement electrique de l'isolateur a des niveaux de tension beaucoup plus faible qu'en absence de glace. L'objectif de ce projet de recherche porte sur l'etude des phenomenes electriques se produisant a la surface d'une couche de glace en presence d'un arc electrique. Plusieurs phenomenes electriques ont ete observes: la periode de decharge electrique; la periode ou l'echantillon de glace a un comportement resistif; et la periode ou l'echantillon de glace semble etre en resonnance avec l'arc electrique.
Author: Marc Duchesne
Publisher: Presses Academiques Francophones
ISBN: 9783838172385
Category :
Languages : fr
Pages : 144
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Book Description
De la source d'energie exploitee jusqu'a la consommation de l'electricite il existe tout un reseau de transport constitue de pylones, d'isolateurs et de lignes de transmission. Or, ces reseaux, lorsqu'ils sont situes dans les regions a climat froid, se trouvent parfois exposes aux problemes lies au givrage atmospherique. En effet, une couche de glace peut s'accumuler sur les isolateurs. Lorsque cette couche fond en surface suite au rayonnement du soleil par exemple, une redistribution du champ electrique le long de l'isolateur peut entrainer l'apparition d'arcs electriques partiels, voir meme un contournement electrique de l'isolateur a des niveaux de tension beaucoup plus faible qu'en absence de glace. L'objectif de ce projet de recherche porte sur l'etude des phenomenes electriques se produisant a la surface d'une couche de glace en presence d'un arc electrique. Plusieurs phenomenes electriques ont ete observes: la periode de decharge electrique; la periode ou l'echantillon de glace a un comportement resistif; et la periode ou l'echantillon de glace semble etre en resonnance avec l'arc electrique.
Author: Frederic Bastiat
Publisher: Simon Publications
ISBN: 9781931541022
Category : Business & Economics
Languages : en
Pages : 0
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Book Description
This book, written by the celebrated nineteenth century French economist propagating free trade, reads as it was written yesterday.
Author: Frédéric Bastiat
Publisher: Jazzybee Verlag
ISBN: 3849648788
Category : Business & Economics
Languages : en
Pages : 770
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Book Description
Keine Angaben
Author: Andrea Maloney Schara
Publisher:
ISBN: 9780615928791
Category : Families
Languages : en
Pages : 318
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Book Description
"Your Mindful Compass" takes us behind the emotional curtain to see the mechanisms regulating individuals in social systems. There is great comfort and wisdom in knowing we can increase our awareness to manage the swift and ancient mechanisms of social control. We can gain greater flexibility by seeing how social controls work in systems from ants to humans. To be less controlled by others, we learn how emotional systems influence our relationship-oriented brain. People want to know what goes on in families that give rise to amazing leaders and/or terrorists. For the first time in history we can understand the systems in which we live. The social sciences have been accumulating knowledge since the early fifties as to how we are regulated by others. S. Milgram, S. Ashe, P. Zimbardo and J. Calhoun, detail the vulnerability to being duped and deceived and the difficulty of cooperating when values differ. Murray Bowen, M.D., the first researcher to observe several live-in families, for up to three years, at the National Institute of Mental Health. Describing how family members overly influence one another and distribute stress unevenly, Bowen described both how symptoms and family leaders emerge in highly stressed families. Our brain is not organized to automatically perceive that each family has an emotional system, fine-tuned by evolution and "valuing" its survival as a whole, as much as the survival of any individual. It is easier to see this emotional system function in ants or mice but not in humans. The emotional system is organized to snooker us humans: encouraging us to take sides, run away from others, to pressure others, to get sick, to blame others, and to have great difficulty in seeing our part in problems. It is hard to see that we become anxious, stressed out and even that we are difficult to deal with. But "thinking systems" can open the doors of perception, allowing us to experience the world in a different way. This book offers both coaching ideas and stories from leaders as to strategies to break out from social control by de-triangling, using paradoxes, reversals and other types of interruptions of highly linked emotional processes. Time is needed to think clearly about the automatic nature of the two against one triangle. Time and experience is required as we learn strategies to put two people together and get self outside the control of the system. In addition, it takes time to clarify and define one's principles, to know what "I" will or will not do and to be able to take a stand with others with whom we are very involved. The good news is that systems' thinking is possible for anyone. It is always possible for an individual to understand feelings and to integrate them with their more rational brains. In so doing, an individual increases his or her ability to communicate despite misunderstandings or even rejection from important others. The effort involved in creating your Mindful Compass enables us to perceive the relationship system without experiencing it's threats. The four points on the Mindful Compass are: 1) Action for Self, 2) Resistance to Forward Progress, 3) Knowledge of Social Systems and the 4) The Ability to Stand Alone. Each gives us a view of the process one enters when making an effort to define a self and build an emotional backbone. It is not easy to find our way through the social jungle. The ability to know emotional systems well enough to take a position for self and to become more differentiated is part of the natural way humans cope with pressure. Now people can use available knowledge to build an emotional backbone, by thoughtfully altering their part in the relationship system. No one knows how far one can go by making an effort to be more of a self-defined individual in relationships to others. Through increasing emotional maturity, we can find greater individual freedom at the same time that we increase our ability to cooperate and to be close to others.
Author: Jacques Lafontaine
Publisher: Springer
ISBN: 3319207350
Category : Mathematics
Languages : en
Pages : 408
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Book Description
This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Author: Alfred Gordon
Publisher:
ISBN:
Category : English language
Languages : en
Pages : 180
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Book Description
Author: P. M. Banks
Publisher: Elsevier
ISBN: 1483260666
Category : Science
Languages : en
Pages : 445
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Book Description
Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.
Author: Laurell K. Hamilton
Publisher: Penguin
ISBN: 1101146680
Category : Fiction
Languages : en
Pages : 753
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Book Description
Vampire hunter Anita Blake finds her life is more complicated than ever, caught as she is between her obligations to the living-and the undead.
Author: Stphane Mallarm
Publisher: Harvard University Press
ISBN: 0674032403
Category : Literary Criticism
Languages : en
Pages : 313
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Book Description
"This is a book just the way I don't like them," the father of French Symbolism, Stphane Mallarm, informs the reader in his preface to Divagations: "scattered and with no architecture." On the heels of this caveat, Mallarm's diverting, discursive, and gorgeously disordered 1897 masterpiece tumbles forth--and proves itself to be just the sort of book his readers like most. The salmagundi of prose poems, prose-poetic musings, criticism, and reflections that is Divagations has long been considered a treasure trove by students of aesthetics and modern poetry. If Mallarm captured the tone and very feel of fin-de-sicle Paris, he went on to captivate the minds of the greatest writers of the twentieth century--from Valry and Eliot to Paul de Man and Jacques Derrida. This was the only book of prose he published in his lifetime and, in a new translation by Barbara Johnson, is now available for the first time in English as Mallarm arranged it. The result is an entrancing work through which a notoriously difficult-to-translate voice shines in all of its languor and musicality. Whether contemplating the poetry of Tennyson, the possibilities of language, a masturbating priest, or the transporting power of dance, Mallarm remains a fascinating companion--charming, opinionated, and pedantic by turns. As an expression of the Symbolist movement and as a contribution to literary studies, Divagations is vitally important. But it is also, in Johnson's masterful translation, endlessly mesmerizing.
Author: Romain Rolland
Publisher: New York : H. Holt
ISBN:
Category : Communism
Languages : en
Pages : 342
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Book Description
The Soul Enchanted is a book about the life of a woman. It starts with a twist. A girl is engaged to a wealthy and credited man, from a noble family. On the verge of the wedding, she deeply questions their relationship and calls it off.
