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Etude Du Comportement Des Tissus Dentaires Soumis Aux Rayonnements Thermiques
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Book Synopsis Etude du comportement des tissus dentaires soumis aux rayonnements thermiques by : Aïda Ben Cheikh
Download or read book Etude du comportement des tissus dentaires soumis aux rayonnements thermiques written by Aïda Ben Cheikh and published by . This book was released on 2012 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’organe dentaire présente une bonne résistance aux altérations post mortem causées par les variations thermiques, physico-chimiques et les activités microbiennes d’où la grande importance de l’odontologie au sein des procédures d’identification médico-légale des individus, particulièrement lorsque les corps sont calcinés. En collaboration avec la section d’ingénierie du feu du Laboratoire Central de la Préfecture de Police de Paris (LCPP) et à l’aide des outils spécifiques que sont le cône calorimètre et l’analyseur thermogravimétrique, l’objectif principal de cette étude est d’analyser les modifications macroscopiques et microscopiques ainsi que les vitesses de perte de masse au cours de la dégradation des tissus dentaires sous l’effet des rayonnements thermiques. Pour ce faire, 33 échantillons dentaires ainsi que des prélèvements d’émail et de cément/dentine ont été nécessaires à la réalisation de l’étude. Les prélèvements ont été étudiés à différentes vitesses de chauffe, de 25 à 1000°C, sous air, tandis que les échantillons ont été soumis à différents flux thermiques allant de 5 à 95 kW/m2 et correspondant à des températures internes aux tissus dentaires de [100-600°q. Les résultats de cette étude permettent, d’un point de vue microscopique, de constater que le tissu amelaire subit très peu de dégradation de par sa structure histologique fortement minéralisée. L’intérêt majeur réside dans le comportement du couple cément/dentine. En effet, il existe des phénomènes de dégradation ponctuels avec augmentation de la vitesse de perte de masse tel que celui retrouvé à 370°C et s’étendant dans un intervalle de température compris entre [25o-500°q. D’un point de vue macroscopique, les résultats obtenus sont homogènes à ceux des données de la littérature. Ainsi, il pourrait être envisageable de mettre en place un teintier universel odontologique fonction de la température et du temps d’exposition «T30 : Teintier-Temporo-Thermique Odontologique ». La dent devient alors, au même titre que n’importe quel autre matériau inorganique présent sur une scène d’incendie, le premier indicateur organique de modélisation et de recherche intéressant à l’enquête de police scientifique et ce notamment dans le cas de catastrophe de masse auxquelles les équipes d’experts médico-légaux sont amenées à faire face.
Book Synopsis Etude de la dégradation d'un matériau d'obturation endodontique soumis aux rayonnements thermiques by : Anh-Thu Tran
Download or read book Etude de la dégradation d'un matériau d'obturation endodontique soumis aux rayonnements thermiques written by Anh-Thu Tran and published by . This book was released on 2015 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le matériau d'obturation endocanalaire est l'un des matériaux les mieux préservés de la cavité buccale lorsque les corps sont calcinés durant une catastrophe à impact thermique (incendies, accidents d'aéronefs, attentats). En collaboration avec la section d'ingénierie du feu du Laboratoire Central de la Préfecture de Police (LCPP) et à l'aide d'outils de caractérisation (l'analyseur thermogravimétrique ATG) et de dégradation thermique (le cône calorimètre), l'objectif de cette étude est d'analyser la dégradation thermique de la gutta percha associé ou non au ciment d'oxyde de zinc-eugénol, lorsque ceux-ci sont soumis à des rayonnements thermiques. Le paramètre de caractérisation étudié est la perte de masse de ces matériaux d'obturation canalaire. Pour les besoins de l'étude, 27 cônes de gutta percha (forme i3) répartis dans le même nombre de dents ont été nécessaires. Les échantillons ont été partagés en 3 groupes : chaque groupe de 9 dents correspond à un flux d'exposition au cône calorimètre (20, 35 et 50 kW/m2) et contient 3 dents obturées à la gutta percha seule, 3 dents obturées à la gutta percha et au ciment d'oxyde de zinc-eugénol et 3 dents obturées au ciment d'oxyde de zinc-eugénol. Deux pré-études ont été réalisées à l'ATG sous azote, de 25 à 800°C avec une vitesse de chauffe de 10°C/min afin d'abord obtenir un référentiel sain, puis de prédire le comportement thermique de ces matériaux lorsqu'ils sont chauffés sans support dentaire. Une troisième étude a été réalisée sur les échantillons avec support dentaire après passage au cône calorimètre sous des flux de 20 à 50 kW/m2. Les résultats de cette étude amènent aux constats suivants : d'une part, comparativement à d'autres polymères, la gutta percha laisse une quantité importante de résidus. D'autre part, la comparaison des thermogrammes sains et dégradés de la gutta percha et ceux du ciment d'oxyde de zinc-eugénol permettent de déduire les températures d'exposition auxquelles ils étaient exposés. Ces températures se situent sur des intervalles de températures moyennes au cône calorimètre de 540°C et 765°C, correspondant à celles retrouvées lors d'un incendie. Le matériau d'obturation endocanalaire devient alors, au même titre que l'organe dentaire et les autres matériaux inorganiques retrouvés sur le lieu du sinistre, un possible indicateur de validation pour la modélisation dans le cadre d'expertise post-incendie.
Book Synopsis Etude physico-chimique et morphologique des tissus calcifiés dentaires soumis à différents traitements thermiques by : Alexandre Sarfatis
Download or read book Etude physico-chimique et morphologique des tissus calcifiés dentaires soumis à différents traitements thermiques written by Alexandre Sarfatis and published by . This book was released on 1989 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas-cooled Nuclear Reactors by : France. Commissariat à l'énergie atomique
Download or read book Gas-cooled Nuclear Reactors written by France. Commissariat à l'énergie atomique and published by . This book was released on 2006 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book El Niño written by Bruno Voituriez and published by UNESCO. This book was released on 2000 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: El Nino, caprice of the heavens, scapegoat for every calamity? The general public cannot really understand what is behind the El Nino phenomenon. The book offers a tour of the Earth's climate to understand one of its normal but extreme components.
Book Synopsis From Microphysics to Macrophysics by : Roger Balian
Download or read book From Microphysics to Macrophysics written by Roger Balian and published by Springer Science & Business Media. This book was released on 2007-06-26 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: This popular, often cited text returns in a softcover edition to provide a thorough introduction to statistical physics and thermodynamics, and to exhibit the universal chain of ideas leading from the laws of microphysics to the macroscopic behaviour of matter. A wide range of applications illustrates the concepts, and many exercises reinforce understanding. Volume II applies statistical methods to systems governed by quantum effects, in particular to solid state physics, explaining properties due to the crystal structure or to the lattice excitations or to the electrons. The last chapters are devoted to non-equilibrium processes and to kinetic equations, with many applications included.
Download or read book Color Television Receivers written by and published by . This book was released on 1978 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report to the President on investigation no. 332-95 under section 332 of the Tariff Act of 1930, as amended.
Book Synopsis Four Laws That Drive the Universe by : Peter Atkins
Download or read book Four Laws That Drive the Universe written by Peter Atkins and published by OUP Oxford. This book was released on 2007-09-06 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The laws of thermodynamics drive everything that happens in the universe. From the sudden expansion of a cloud of gas to the cooling of hot metal, and from the unfurling of a leaf to the course of life itself - everything is directed and constrained by four simple laws. They establish fundamental concepts such as temperature and heat, and reveal the arrow of time and even the nature of energy itself. Peter Atkins' powerful and compelling introduction explains what the laws are and how they work, using accessible language and virtually no mathematics. Guiding the reader from the Zeroth Law to the Third Law, he introduces the fascinating concept of entropy, and how it not only explains why your desk tends to get messier, but also how its unstoppable rise constitutes the engine of the universe.
Book Synopsis Water & Heritage by : Willem Willems
Download or read book Water & Heritage written by Willem Willems and published by . This book was released on 2017-01-15 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water is vital for life, and its availability has been a concern for mankind throughout the ages. Its presence has always been ascertained in a variety of ways and the development of human society everywhere is connected with various forms of water management. Man also needed to manage water to find protection from its dangers and the need for that is increasing. In the coming decades, the impact of climate change is expected to intensify floods and droughts, affect groundwater resources, raise sea levels, increase pollution and enhance the frequency and magnitude of disasters. Societies around the world are challenged to adapt to these threats to ensure water security, economic prosperity and environmental and cultural sustainability. This book deals with the heritage of water management and the use that was made of water, as well as the impact of water management on heritage. An example of the former may be an ancient irrigation system in the Filipines or in the Middle East that still functions today, while the latter may reflect the importance of maintaining groundwater levels for the preservation of organic remains on archaeological sites or of wooden piles underneath standing buildings. In either case the papers in this book reflect the dynamic nature of water, and hence the equally dynamic relation between water management and heritage. This publication follows up on a Heritage and Water conference in Amsterdam, the first of its kind. Its main purpose is to credibly present the importance and value of heritage and historical experience for water and sustainable development, and vice versa, present the importance of water management for the protection of heritage. It presents evolving insights and concepts about Water and about Heritage from a variety of disciplines, policy and public perspectives illustrated with cases studies and aims to connect decision makers with experts such as engineers, archaeologists, historians, geographers, ecologist and landscape architects
Book Synopsis Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsätzliche Verfahren der ökologischen Landwirtschaft / Le Maintien de la Fertilité des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkeit by : Stuart Hill
Download or read book Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsätzliche Verfahren der ökologischen Landwirtschaft / Le Maintien de la Fertilité des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkeit written by Stuart Hill and published by Birkhäuser. This book was released on 2013-12-14 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis French Grammar in Context by : Margaret Jubb
Download or read book French Grammar in Context written by Margaret Jubb and published by Routledge. This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taking authentic texts from a variety of sources - the human body on CD-ROM, a fish recipe, 'L'Etranger' and many others - this book uses them as a starting point for the illustration and explanation of key areas of French grammar. It includes a range of exercises, many of them text-based.
Download or read book Hypnosis written by Léon Chertok and published by Pergamon. This book was released on 1966 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nationwide Evaluation of X-ray Trends by : Nationwide Evaluation of X-ray Trends Task Force
Download or read book Nationwide Evaluation of X-ray Trends written by Nationwide Evaluation of X-ray Trends Task Force and published by . This book was released on 1976 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radioactive Aerosols by : Constantin Papastefanou
Download or read book Radioactive Aerosols written by Constantin Papastefanou and published by Elsevier. This book was released on 2011-07-28 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Faecal Sludge Management by : Linda Strande
Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
Author :United States. Environmental Protection Agency. Office of Radiation Programs Publisher : ISBN 13 : Total Pages :200 pages Book Rating :4.E/5 ( download)
Book Synopsis Radiation Protection Activities by : United States. Environmental Protection Agency. Office of Radiation Programs
Download or read book Radiation Protection Activities written by United States. Environmental Protection Agency. Office of Radiation Programs and published by . This book was released on 1976 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Science of metals by : Zay Jeffries
Download or read book The Science of metals written by Zay Jeffries and published by . This book was released on 1924 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
