Radiométrie microonde en champ proche PDF Download

Author: Ahmed Mamouni
Publisher:
ISBN:
Category :
Languages : fr
Pages : 286

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Author:
Publisher: Ed. Techniques Ingénieur
ISBN:
Category :
Languages : fr
Pages : 18

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Author: International Measurement Confederation. IMEKO Congress
Publisher:
ISBN:
Category : Engineering instruments
Languages : en
Pages : 774

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Author: Khalid Ridaoui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0

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Le cadre general de ce travail est l'etude du couplage electromagnetique entre une sonde et un milieu dissipatif pour des applications interessant notamment la radiometrie microonde. La connaissance des signaux electromagnetiques d'origine thermique, emis spontanement par un materiau dissipatif, necessite la determination des parametres de couplage le liant a la sonde. L'etude du rayonnement en champ proche d'un guide d'onde dans un milieu de permittivite complexe est traitee par un calcul semi-analytique base sur une methode modale dans le cas de milieux homogenes ou stratifies. Dans le cas de milieux heterogenes, un logiciel (hfss de hewlett packard) base sur le calcul par les elements finis est exploite. Les differents exemples de structures presentes permettent d'evaluer les potentialites et les limites de ces deux outils de traitement electromagnetique qui ont notamment permis de mettre en evidence les modes retrogrades dans le cas de milieux a faibles pertes. Une partie experimentale realisee en mode actif a des frequences voisines de 3 ghz permet, d'une part de verifier la validite des modeles etablis par l'examen du coefficient de reflexion et du bilan de puissance presentes par des milieux tests, et d'autre part d'envisager des applications en controle non destructif de materiaux. Une partie de ce travail est consacree a l'exploitation des parametres de couplage pour l'application a l'imagerie radiometrique microonde (i.m.o.).

Author: Tsutomu Sugahara
Publisher:
ISBN:
Category : Cancer
Languages : en
Pages : 848

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Author: Jean Mouchet
Publisher: John Libbey Eurotext
ISBN:
Category : Medical
Languages : en
Pages : 468

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One million dead a Wear, 500 million with the disease, 2.5 billion people at risk : this is the malaria balance sheet in 2007. The distribution and seriousness of the disease depend on the pathogens and vectors involved, as welt as environmental conditions. Of the four parasites (Plasmodium), only P. falciparum kilts although the other three cause debilitating disease with regular relapses and recrudescence. More than fifty species of Anopheles can fulfil the vector rote which is essential in transmission of the parasite between human beings. Climatic factors (temperature and rainfall), the environment and biogeographical particularities dictate the distribution of anopheline species and determine transmission rates. This is why it makes sense to tank about the biodiversity of malaria. Today, more than 90% of deaths from malaria occur in Tropical Africa which is home to only 10% of humanity. Every 30 seconds a child dies from malaria. This continent harbours the most effective vectors (An. gambiae and An. funestus, in particular) and the climate is highly conducive to transmission of the disease. Severe malaria is also seen in forest foci in Southeast Asia, Papua-New Guinea and the Amazon. In the rest of the tropical and subtropical world, P. vivax and/or P malariae cause less severe disease.

Author: Mehrez Zribi
Publisher: Elsevier
ISBN: 0128180862
Category : Science
Languages : en
Pages : 352

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Water Resources in the Mediterranean Region summarizes and collates scientific developments around water resources in the Mediterranean socio-economic environment through a multidisciplinary framework synthesizing hydrology, hydrogeology, climate, bioclimatology, economics, and geography. As such, it provides essential information for any reader looking to learn more about the Mediterranean which is experiencing the impact of climate change and concurrent complex issues of anthropogenic effects, especially in agriculture and other resource uses. Water Resources in the Mediterranean Region covers different challenges in the issue of the evolution of water resources in the Mediterranean. It is intended for PhD students, research scientists, and managers interested in new solutions and approaches for water management and in the forecast of future water dynamics. Offers multidisciplinary content providing global visions of the challenges faced in the Mediterranean region Presents fundamental and operational studies, providing the reader with information on how to implement these actions and results themselves Written in a pedagogical manner, allowing for ease of reading for both researchers and water managers

Author: Constantin Papastefanou
Publisher: Elsevier
ISBN: 0080555985
Category : Medical
Languages : en
Pages : 187

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Whenever radioactivity is released to the atmosphere, for example by the detonation of nuclear weapons or the testing of nuclear weapons or from nuclear reactor accidents that fraction of it which remains airborne for more than a few hours is liable to be attached to aerosol particles. The resulting radioactive aerosols are carried by atmospheric mixing processes until they settle out or are scavenged by precipitation. The radiation exposure pathway of maximum concern to humans is by inhalation of aerosols and their deposition in the respiratory tract. In this context, it is important to note that radioactive aerosols are commonly of natural origin alos. In particular, the associated radionuclides can be of natural terrestrial origin, such as the decay products of radon gas, or they can e cosmogenic, such as beryllium-7. The exposure of miners of uranium and other ores and minerals to radon and its aerosol-borne decay products is of major significance. The book describes the formation of aerosols, their aerodynamic size distribution, their atmospheric residence time, their sampling and measurement, the range of radioactive aerosols found and studied thus far, including man-made nuclides and radon decay products and their interaction with man, including deposition in the lung and subsequent health effects. - Advanced level science handbook for researchers, scientists and academics - Covers all aspects of radiation exposure in humans, including subsequent health implications - Presents the latest findings and analysis in this highly topical area

Author: Joe Allen Elder
Publisher:
ISBN:
Category : Microwaves
Languages : en
Pages : 284

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Author: United States. Environmental Protection Agency. Office of Radiation Programs
Publisher:
ISBN:
Category : Radiation
Languages : en
Pages : 200

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