ETUDE DE LA STRUCTURE DES ISOTOPES DE CARBONE DEFICIENTS EN NEUTRONS PDF Download
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Author: CEDRIC.. JOUANNE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 169
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Book Description
CE TRAVAIL PORTE SUR L'ETUDE DE LA STRUCTURE DES ISOTOPES DE CARBONE DEFICIENTS EN NEUTRONS : 1 0C ET 1 1C. UN MODELE THEORIQUE PREVOIT UN PHENOMENE PARTICULIER POUR CES NOYAUX : DES DEFORMATIONS DIFFERENTES POUR LES DISTRIBUTIONS DE DENSITE DE NEUTRONS ET DE PROTONS. AFIN DE TESTER CES PREDICTIONS ET OBTENIR DES INFORMATIONS SUR LA STRUCTURE DE CES NOYAUX, NOUS AVONS MESURE LES DISTRIBUTIONS ANGULAIRES DE DIFFUSIONS ELASTIQUE ET INELASTIQUE PROTON-NOYAU EN CINEMATIQUE INVERSE AU GANIL A 40 MEV PAR NUCLEON. LA MESURE DE L'ENERGIE ET DE L'ANGLE DE DIFFUSION DES PROTONS DE RECUL AVEC LE DETECTEUR MUST PERMET D'EXTRAIRE LES DISTRIBUTIONS ANGULAIRES. LE DISPOSITIF EXPERIMENTAL EST COMPLETE PAR DES DETECTEURS DE PLASTIQUE POUR L'IDENTIFICATION DES EJECTILES ET DEUX DETECTEURS CATS POUR CONNAITRE LA POSITION ET L'ANGLE D'INCIDENCE SUR LA CIBLE DE CHACUNE DES PARTICULES DU FAISCEAU. LA RECONSTRUCTION DES DISTRIBUTIONS ANGULAIRES EST OBTENUE ANALYTIQUEMENT, CETTE METHODE EST VALIDEE PAR UNE SIMULATION ET PAR L'ETUDE DE LA DIFFUSION 1 2C + P. L'ANALYSE DES DISTRIBUTIONS ANGULAIRES EST EFFECTUEE A L'AIDE DU POTENTIEL OPTIQUE COMPLEXE MICROSCOPIQUE JLM ET DE DENSITES DE MATIERE MICROSCOPIQUE. L'ETUDE DE LA DIFFUSION ELASTIQUE PERMET D'EXTRAIRE DES RAYONS CARRES MOYENS DE MATIERE DU 1 0C ET DU 1 1C. CES RAYONS SONT TOUS LES DEUX SUPERIEURS A CELUI DU NOYAU STABLE DE 1 2C. LA DIFFUSION INELASTIQUE EST TRAITEE DANS L'APPROXIMATION DWBA AVEC DES DENSITES DE TRANSITION MICROSCOPIQUES. L'ANALYSE DE LA DIFFUSION INELASTIQUE DU 1 0C FOURNIT UNE INFORMATION SUR LA CONTRIBUTION DES NEUTRONS A L'EXCITATION DU NOYAU. LA DIFFUSION INELASTIQUE DU 1 1C VERS DEUX ETATS EXCITES PERMET DE METTRE EN EVIDENCE LA NATURE DE CES TRANSITIONS ET CONTRAINT LES DENSITES DE TRANSITION VERS CES ETATS. IL EST TOUTEFOIS DIFFICILE DE CONFIRMER OU D'INFIRMER L'HYPOTHESE DE DEFORMATIONS DIFFERENTES POUR LES DISTRIBUTIONS DE DENSITE DES NEUTRONS ET DES PROTONS DE CES NOYAUX.
Author: CEDRIC.. JOUANNE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 169
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Book Description
CE TRAVAIL PORTE SUR L'ETUDE DE LA STRUCTURE DES ISOTOPES DE CARBONE DEFICIENTS EN NEUTRONS : 1 0C ET 1 1C. UN MODELE THEORIQUE PREVOIT UN PHENOMENE PARTICULIER POUR CES NOYAUX : DES DEFORMATIONS DIFFERENTES POUR LES DISTRIBUTIONS DE DENSITE DE NEUTRONS ET DE PROTONS. AFIN DE TESTER CES PREDICTIONS ET OBTENIR DES INFORMATIONS SUR LA STRUCTURE DE CES NOYAUX, NOUS AVONS MESURE LES DISTRIBUTIONS ANGULAIRES DE DIFFUSIONS ELASTIQUE ET INELASTIQUE PROTON-NOYAU EN CINEMATIQUE INVERSE AU GANIL A 40 MEV PAR NUCLEON. LA MESURE DE L'ENERGIE ET DE L'ANGLE DE DIFFUSION DES PROTONS DE RECUL AVEC LE DETECTEUR MUST PERMET D'EXTRAIRE LES DISTRIBUTIONS ANGULAIRES. LE DISPOSITIF EXPERIMENTAL EST COMPLETE PAR DES DETECTEURS DE PLASTIQUE POUR L'IDENTIFICATION DES EJECTILES ET DEUX DETECTEURS CATS POUR CONNAITRE LA POSITION ET L'ANGLE D'INCIDENCE SUR LA CIBLE DE CHACUNE DES PARTICULES DU FAISCEAU. LA RECONSTRUCTION DES DISTRIBUTIONS ANGULAIRES EST OBTENUE ANALYTIQUEMENT, CETTE METHODE EST VALIDEE PAR UNE SIMULATION ET PAR L'ETUDE DE LA DIFFUSION 1 2C + P. L'ANALYSE DES DISTRIBUTIONS ANGULAIRES EST EFFECTUEE A L'AIDE DU POTENTIEL OPTIQUE COMPLEXE MICROSCOPIQUE JLM ET DE DENSITES DE MATIERE MICROSCOPIQUE. L'ETUDE DE LA DIFFUSION ELASTIQUE PERMET D'EXTRAIRE DES RAYONS CARRES MOYENS DE MATIERE DU 1 0C ET DU 1 1C. CES RAYONS SONT TOUS LES DEUX SUPERIEURS A CELUI DU NOYAU STABLE DE 1 2C. LA DIFFUSION INELASTIQUE EST TRAITEE DANS L'APPROXIMATION DWBA AVEC DES DENSITES DE TRANSITION MICROSCOPIQUES. L'ANALYSE DE LA DIFFUSION INELASTIQUE DU 1 0C FOURNIT UNE INFORMATION SUR LA CONTRIBUTION DES NEUTRONS A L'EXCITATION DU NOYAU. LA DIFFUSION INELASTIQUE DU 1 1C VERS DEUX ETATS EXCITES PERMET DE METTRE EN EVIDENCE LA NATURE DE CES TRANSITIONS ET CONTRAINT LES DENSITES DE TRANSITION VERS CES ETATS. IL EST TOUTEFOIS DIFFICILE DE CONFIRMER OU D'INFIRMER L'HYPOTHESE DE DEFORMATIONS DIFFERENTES POUR LES DISTRIBUTIONS DE DENSITE DES NEUTRONS ET DES PROTONS DE CES NOYAUX.
Author: M.J. Unkovich
Publisher: Springer Science & Business Media
ISBN: 9780792370789
Category : Nature
Languages : en
Pages : 312
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Book Description
This book has a very strong practical orientation, telling readers what methodologies are available using stable isotopes, how studies should be designed and executed to maximise effectiveness and incisiveness in terms of data obtained and outcomes in terms of understanding events and processes in plant and ecosystem functioning. The readership is very much aimed toward postgraduates with good knowledge of general biological principles and underlying chemical and physical processes. Pre-existing knowledge of or experience in application and assay of stable isotopes is not required. The stable isotope research field is one of the most rapidly growing areas of ecophysiology and techniques using stable isotopes comprise an ever increasing component of research programs of university postgraduates and a wide range of agencies conducting environmental monitoring and rehabilitation programs. The book is tailor-made for such an audience.
Author: A.P. Legrand
Publisher: Springer Science & Business Media
ISBN: 1475796498
Category : Science
Languages : en
Pages : 503
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Book Description
Conjugated polymers suoh as polyaoetylene (CH)x polyphenylene (C6H4)x' poly thiophene (C4H2S)x' etc., which are insulators in their pristine state, can be brought to the metallic state after "doping" with ohemioal speoies whioh oan be either eleotron donors or I aoceptors. . This doping prooess involves a oharge transfer between the dopant moleoule and the polymer ohain whioh are then supposed to be spatially olose to each other. It follows that the meohanism of doping must be oonsidered as an aotual interoalation process, which will greatly affeot the struotural oharacteristios of the starting material, as well as its morphology, as has been observed during the 2 intercalation of graphite and layered compounds . In parallel with these modifioations, the band struoture of the system changes yielding a new set of eleotronio properties. It is evident therefore that the struotural and eleotronio properties are intimately related, and must be studied simultaneously in the same system to give reliable information. A great number of studies have been devoted to the structural and electronic properties of conjugated polymers after a chemical or 2 electrochemical doping process . Most of these concern the properties of the system for a given dopant concentration. With this approach a universal pioture of the polymer/dopant system is very diffioult to obtain, as a comparison between different experiments is very hazardous. On the other hand, only a small number of measurements have been performed during the continuous electroohemioal doping of various polymers.
Author: Reinhard Pienitz
Publisher: Springer Science & Business Media
ISBN: 1402021267
Category : Science
Languages : en
Pages : 579
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Book Description
Concerns about the effects of global climate change have focused attention on the vulnerability of circumpolar regions. This book offers a synthesis of the spectrum of techniques available for generating long-term environmental records from circumpolar lakes.
Author: Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture
Publisher:
ISBN: 9789201109088
Category : Business & Economics
Languages : en
Pages : 0
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Book Description
Soil and water management is the key to sustainable crop production and food security. This book contains contributions from participants of an IAEA coordinated research program on the use of nuclear techniques for developing integrated nutrient and water management practices for agroforestry systems.
Author: D. Atkinson
Publisher: Springer Science & Business Media
ISBN: 9400968337
Category : Science
Languages : en
Pages : 503
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Book Description
Proceedings of a Meeting of the IUFRO, Working Party on Root Physiology and Symbiosis
Author: Volker Jörg Dietrich
Publisher: Springer
ISBN: 3319554603
Category : Science
Languages : en
Pages : 346
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Book Description
This book presents the first compilation of scientific research on the island of Nisyros, involving various geoscientific disciplines. Presenting a wealth of illustrations and maps, including a geological map of the volcano, it also provides valuable insights into the geothermal potential of Greece. The island of Nisyros is a Quaternary volcano located at the easternmost end of the South Aegean Volcanic Arc. The island is nearly circular, with an average diameter of 8 km, and covers an area of approximately 42 km2. It lies above a base of Mesozoic limestone and a thin crust, with the mantle-crust transition located at a depth of approximately 27 km. The volcanic edifice of Nisyros comprises a succession of calc-alkaline lavas and pyroclastic rocks, as well as a summit caldera with an average diameter of 4 km. Nisyros marks the most recent volcano in the large prehistoric volcanic field between Kos-Yali-Strongyli-Pyrgousa-Pachia-Nisyros, where the largest eruption (“Kos Plateau Tuff”) in the history of the eastern Mediterranean devastated the Dodecanese islands 161,000 years ago. Although the last volcanic activity on Nisyros dates back at least 20,000 to 25,000 years, it encompasses an active hydrothermal system underneath the volcano with temperatures of roughly 100°C at the Lakki plain, the present-day caldera floor and 350°C at a depth of 1,550 m. A high level of seismic unrest, thermal waters and fumarolic gases bear testament to its continuous activity, which is due to a large volume of hot rocks and magma batches at greater depths, between 3,000 and 8,000 m. Violent hydrothermal eruptions accompanied by major earthquakes occurred in 1873 and 1888 and left behind large, “world-wide unique” explosion craters in the old caldera. Through diffuse soil degassing, the discharge of all hydrothermal craters in the Lakki plain releases 68 tons of hydrothermal-volcanic derived CO2 and 42 MW of thermal energy per day. This unique volcanic and hydrothermal environment is visited daily by hundreds of tourists.
Author: Philip R. Ashurst
Publisher: Springer Science & Business Media
ISBN: 1461311195
Category : Technology & Engineering
Languages : en
Pages : 418
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Book Description
The issue of food authenticity is not new. For centuries unscrupulous farmers and traders have attempted to 'extend', or othewise alter, their products to maximise revenues. In recent years the subject has reached new prominence and there even have been situations where food authenticity has featured as a newspaper headline in various countries. Food legislation covering the definition, and in some cases composition, of various commodities has been in place in developed countries for many years and paradoxically it is the legislative trend away from emphasis on composition and more on accurate and truthfullabeliing that has been one driving force for the authenticity issue. Another, and many would speculate as the more potent, driving force is the move towards fewer and larger supermarket chains in many countries. Such trading companies with their images of quality products, buying power and commercial standing, exercise considerable commercial power which has been claimed as a significant source of financial pressure on food prices and food commodity product quality. For whatever reason, recent food authenticity issues have become news and consumers, the media and enforcement authorities are showing more interest than ever before in the subject.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 610
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Book Description
Author: United States. Department of State
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 20
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Book Description
