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Dissertations / Theses on the topic 'RADIUM 228'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Kandlbinder, Robert. "Bestimmung des Verhältnisses von 228 Th zu 228 Ra in menschlichen Knochen zur Datierung des postmortalen Intervalls." kostenfrei, 2010. http://epub.uni-regensburg.de/14607/.

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2

JESUS, SUELI C. de. "Levantamento dos niveis de radioatividade natural em aguas do Alto Vale do Ribeira a planicie costeira do litoral Sul do estado de Sao Paulo." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9598.

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3

OLIVEIRA, JOSELENE de. "Determinacao de sup226Ra e sup228Ra em aguas minerais da regiao de Aguas da Prata." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10337.

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4

LAPA, FLAVIA V. "Evolução temporal das distribuições dos radionuclídeos naturais U-238, Th-234, Ra-226, Ra-228, Pb-210 e Po-210 no estreito de Bransfield, Península Antártica." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10209.

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5

RUSSO, ANA C. "Avaliação da biodisponibilidade dos radionuclídeos Ra-226, Ra-228 e Pb-210 presentes nos fertilizantes fosfatados e no fosfogesso de procedência nacional." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10199.

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MORA, TAMIRES de A. "Avaliação da concentração de atividade de Ra-226, Ra-228 e Pb-210 em sedimentos provenientes da Antártica na região da Baía do Almirantado." reponame:Repositório Institucional do IPEN, 2015. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26077.

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7

NEGRAO, SERGIO G. "Determinação dos isótopos naturais de rádio de meias-vidas longas, Ra-226 e Ra-228, em águas minerais utilizadas nos Balneários de Caxambú (MG) e Águas de Lindóia (SP)." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10084.

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LEONARDO, LUCIO. "Utilizacao de liquens como bioindicadores de contaminacao atmosferica por radionuclideos naturais e metais em regiao impactada por tenorm." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9555.

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9

COSTA, ALICE M. R. "Estudo dos radionuclídeos naturais - Ra-226, Ra-228 e Pb-210 - em alguns registros sedimentares do Atlântico Sudoeste ao longo do Holoceno." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26927.

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Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2016-12-21T11:51:34Z No. of bitstreams: 0<br>Made available in DSpace on 2016-12-21T11:51:34Z (GMT). No. of bitstreams: 0<br>Os radionuclídeos naturais das séries radioativas do 238U e do 232Th têm sido aplicados com sucesso como traçadores de processos ambientais atuais e mudanças climáticas. O 210Pb (meia-vida de 22,2 anos) é empregado na técnica de datação geocronológica de testemunhos sedimentares dos últimos 100-150 anos e na determinação de taxa de sedimentação. As concentrações dos isótopos 226Ra e 228Ra (meia-vida de 1

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SAUEIA, CATIA H. R. "Distribuição elementar e de radionuclídeos na produção e uso de fertilizantes fosfotados no Brasil." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11450.

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ROSA, MYCHELLE M. L. "Avaliação dos teores de U, Th, sup(226)Ra, sup(228)Ra, sup(210)Pb e outros elementos de interesse presentes em cogumelos em uma região de elevada radioatividade natural no Brasil." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9932.

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OLIVEIRA, JOSELENE de. "Determinacao dos niveis de radioatividade natural em aguas utilizadas para abastecimento publico no Estado de Sao Paulo .Vol. 2." reponame:Repositório Institucional do IPEN, 1998. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10699.

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13

OLIVEIRA, JOSELENE de. "Determinacao dos niveis de radioatividade natural em aguas utilizadas para abastecimento publico no Estado de Sao Paulo .Vol 1." reponame:Repositório Institucional do IPEN, 1998. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10698.

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14

NISTI, MARCELO B. "Lixiviação de metais e radionuclídeos em solos tropicais condicionados com fosfogesso." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/27137.

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Submitted by Mery Piedad Zamudio Igami (mery@ipen.br) on 2017-03-10T16:36:15Z No. of bitstreams: 0<br>Made available in DSpace on 2017-03-10T16:36:15Z (GMT). No. of bitstreams: 0<br>O fertilizante fosfatado brasileiro é obtido pela reação por via úmida da rocha fosfática de origem ígnea com ácido sulfúrico concentrado, obtendo como produto final, o ácido fosfórico e como resíduo, o fosfogesso, que é estocado em pilhas, a céu aberto, junto às instalações produtoras. Parte do fosfogesso vem sendo utilizada na agricultura como condicionador de solos, devido a sua alta solubilidade, podendo melho

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15

Saueia, Cátia Heloisa Rosignoli. "Distribuição elementar e de radionuclídeos na produção e uso de fertilizantes fosfatados no Brasil." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-22032012-173112/.

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O fertilizante é considerado um componente essencial para a agricultura, pois sua utilização aumenta e repõe os nutrientes naturais do solo, perdidos por desgaste ou erosão. No processo de obtenção dos fertilizantes fosfatados, o concentrado de rocha reage com ácido sulfúrico concentrado produzindo ácido fosfórico e sulfato de cálcio (fosfogesso), como subproduto. O ácido fosfórico é utilizado para a produção do superfosfato triplo (TSP), superfosfato simples (SSP), monoamônio fosfato (MAP) e diamônio fosfato (DAP). A rocha fosfatada usada como matéria prima apresenta em sua composição radionu

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16

VanSant, Paul Daniel. "Medical Isotope Production of Actinium 225 By Linear Accelerator Photon Irradiation of Radium 226." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/50984.

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There is a present and future need for the medical isotope Actinium-225, currently in short supply worldwide. Only a couple manufacturers produce it in very low quantities. In roughly the past 10 years the medical community has explored the use of Ac-225 and its daughter Bismuth-213 for targeting a number of differing cancers by way of Targeted Alpha Therapy (TAT). This method utilizes the alpha-decay of both Ac-225 (half-life 10 days) and Bi-213 <br />(half-life 46 min) to kill cancerous cells on a localized basis. Maximum energy is delivered to the cancer cells thereby greatly minimizing

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17

Butler, Anna Helena. "Radon-222, radium-226, uranium and major ionic concentrations in the groundwater of the Georgia Piedmont : their relationship with geology and each other." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/30759.

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18

Lamy, Sophie. "Contribution à l'étude du radium 226, du radon 222 et de leurs descendants dans des milieux liquides naturels : application à la Franche-Comté." Besançon, 2003. http://www.theses.fr/2003BESA2012.

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Cette thèse a permis de définir une méthodologie d'analyse des émetteurs alpha en milieux dispersés par scintillation liquide, afin de déterminer l'impact de l'emploi du 226Ra par l'horlogerie dans les eaux de Franche-Comté. L'analyse de rivières proches de sites horlogers (Doubs, Loue, Dessoubre) n'a pas montré de radium sous forme dissoute, mais du radon et ses descendants ont été décelés à des activités volumiques comprises entre 1 et 5,5 Bq. L-1. L'analyse comparative d'autres eaux de surface de la région a révélé des activités volumiques en radon de 91 Bq. L-1 au maximum. Des sédiments pr

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Tirichter, Natalia [Verfasser], and Peter [Akademischer Betreuer] Bartenstein. "Radium-223-dichlorid beim ossär metastasierten Prostatakarzinom in der klinischen Routine / Natalia Tirichter ; Betreuer: Peter Bartenstein." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1182228682/34.

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Dabrowski, Jessica Stephanie. "Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/128993.

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Thesis: S.M., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2020<br>Cataloged from student-submitted PDF of thesis.<br>Includes bibliographical references.<br>Arctic marine and lacustrine systems are experiencing rapid warming due to climate change. These changes are especially important at the interface between sediments and surface waters because they are hotspots for biogeochemical transformations such as redox reactions, nutr

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FARIAS, LUCIANA A. "Calibracao de uma linha de emanacao para determinacao de sup(222) Rn em amostras de agua do mar." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11019.

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Flausino, de Paiva Maria Isabel. "A study of electrochemical precipitation as a possible method of removing radium from uranium industry liquid wastes." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/26815.

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Of the various dissolved species contained in the effluents from the mining and milling of uranium ores, the one which is of particular concern for environmental protection is Radium-226. The literature shows that, in recent years, considerable efforts have been made to develop treatment systems that can achieve the stricter effluent discharge standards imposed by the regulatory bodies. There has also been a concern to treat the already existent sludges from previous treatments. The main priority is to limit, as much as possible, the arising of sludge from future treatment systems. The most co

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Sargent, Ethan. "Radial Solutions to Semipositone Dirichlet Problems." Scholarship @ Claremont, 2019. https://scholarship.claremont.edu/hmc_theses/229.

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We study a Dirichlet problem, investigating existence and uniqueness for semipositone and superlinear nonlinearities. We make use of Pohozaev identities, energy arguments, and bifurcation from a simple eigenvalue.

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Kalita, Mukut R. "Search for a Permanent Electric Dipole Moment of ²²⁵Ra." UKnowledge, 2015. http://uknowledge.uky.edu/physastron_etds/34.

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The observation of a permanent electric dipole moment (EDM) in a non-degenerate system would indicate the violation of discrete symmetries of Time reversal (T) or combined application of Charge (C) and Parity (P) symmetry violation through the CPT theorem. The diamagnetic 225Ra atom with nuclear spin I=1/2 is a favorable candidate for an EDM search. Experimental sensitivity to its EDM is enhanced due to its high atomic mass and the increased Schiff moment of its octupole deformed nucleus. An experimental setup is developed where laser cooled neutral radium atoms are collected in a magneto-opti

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Marx, Sebastian [Verfasser], Andreas [Akademischer Betreuer] Türler, and Klaus [Akademischer Betreuer] Köhler. "Radium-Aufreinigung zur Herstellung von Actinium-225 am Zyklotron für die Alpha-Immuntherapie / Sebastian Marx. Gutachter: Andreas Türler ; Klaus Köhler. Betreuer: Andreas Türler." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1067271414/34.

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BARROS, LIVIA F. "Avaliação da variação da radioatividade natural em areias da Praia de Camburi-Vitória-Espírito Santo com fatores climatológicos e geológicos da região." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10591.

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AMARAL, ROMILTON dos S. "Dose na populacao da regiao urano-fosfatica pernambucana devido a presenca de uranio e Rasup226 nos cultivares." reponame:Repositório Institucional do IPEN, 1994. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10409.

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PAES, VANESSA P. "Caracterizacao radioquimica do sup(226)Ra, sup(40)K e dos isotopos de uranio e torio no fosfogesso." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10917.

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James, Patrick R. "Natural #alpha#-radionuclides in children's teeth." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299336.

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SANTOS, ADIR J. G. dos. "Avaliacao do impacto radiologico ambiental do fosfogesso brasileiro e lixiviacao de sup (226) Ra e sup (210) Pb." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11043.

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ARAÚJO, Andressa Arruda De. "Determinação radioquímica de 210Pb e 226Ra em borras e inscrutações de petróleo." Universidade Federal de Pernambuco, 2005. https://repositorio.ufpe.br/handle/123456789/9901.

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Noirot, Gaël. "The CARLA-Hubble survey : spectroscopic confirmation and galaxy stellar activity of rich structures at 1.4 < z < 2.8." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC153.

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Les études détaillées d'amas de galaxies confirmés à grands redshifts sont peu nombreuses. L’objectif de cette Thèse est d’établir le premier catalogue d'amas confirmés spectroscopiquement à grand redshift et, pour la première fois à ces redshifts, d’étudier de manière statistique les propriétés des galaxies membres des amas. Dans cette Thèse, nous caractérisons et étudions 20 candidats amas à redshifts 1.4 < z < 2.8 parmi les candidats les plus prometteurs de l’échantillon CARLA. Nous réduisons et analysons des données spectroscopiques grism sans fente et imagerie proche-infrarouge des

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SAITO, ROBERTO T. "Radionuclideos sup(210) PB, sup(226) Ra, sup(210) Po e sup(137) Cs no Sistema Costeiro Cananeia-Iguape: estudos ambientais." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11014.

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Lloyd, Ben David, University of Western Sydney, and Faculty of Science and Technology. "Jets in Fanaroff-Riley class I radio galaxies." THESIS_FST_XXX_Lloyd_B.xml, 1997. http://handle.uws.edu.au:8081/1959.7/258.

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Presented here are observations, analysis and interpretation of five Fanaroff-Riley class I radio galaxies. Total intensity and polarised emission was observed in each source at 6 and 3 cm at angular resolutions of 16 to 2 arc seconds. These sources have a flux density greater than 1 Jy at 843 MHz, are 10-30 arc minutes in total angular extent, have redshifts between 0.011 and 0.035, are south of declination –43 degrees and have bright prominent jet structure. Images of the distribution of total intensity, polarised intensity and magnetic field configuration are presented and analysed. Physica

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Van, Beek Pieter. "TRACAGE DES ECHANGES COTE-LARGE, DE LA CIRCULATION ET DU MELANGE DANS L'OCEAN PAR LES ISOTOPES DU RADIUM." Habilitation à diriger des recherches, Université Paul Sabatier - Toulouse III, 2012. http://tel.archives-ouvertes.fr/tel-01010158.

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Les plateaux continentaux et les marges océaniques, à l'interface entre les continents et les océans, constituent une zone clé d'échange d'éléments chimiques et de matière. Ces éléments chimiques sont apportés par les fleuves, potentiellement relâchés par les sédiments déposés sur les marges ou apportés par les résurgences sous-marines (ou plus globalement par les SGD, " Submarine Groundwater Discharge "), puis sont transmis à l'océan ouvert. De nombreuses transformations chimiques ont également lieu au-niveau de cet interface (précipitation, adsorption, désorption, floculation, diffusion depu

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SAUEIA, CATIA H. R. "Caracterizacao radioquimica do fosfogesso e implicacoes radiologicas de sua utilizacao como material de construcao." reponame:Repositório Institucional do IPEN, 1998. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10717.

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Tang, Jin Niu Guofu. "Modeling and scaling limitations of SiGe HBT low-frequency noise and oscillator phase noise." Auburn, Ala., 2006. http://repo.lib.auburn.edu/Send%208-7-07/TANG_JIN_32.pdf.

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Zhang, Yonghong. "Resource allocation for OFDM-based cognitive radio systems." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2828.

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Cognitive radio (CR) is a novel wireless communication approach that may alleviate the looming spectrum-shortage crisis. Orthogonal frequency division multiplexing (OFDM) is an attractive modulation candidate for CR systems. In this thesis, we study resource allocation (RA) for OFDM-based CR systems using both aggressive and protective sharing. In aggressive sharing, cognitive radio users (CRUs) can share both non-active and active primary user (PU) bands. We develop a model that describes aggressive sharing, and formulate a corresponding multidimensional knapsack problem (MDKP). Low-complexi

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VILLAVERDE, FREDDY L. "Avaliacao da exposicao externa em residencia contruida com fosfogesso." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11754.

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AQUINO, REGINALDO R. de. "Avaliacao da radioatividade natural em areias das praias da Grande Vitoria, Espirito Santo." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9612.

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Liberati, Blake P. "Removal of Naturally Occurring Radioactive Material From Flowback/Produced Water From the Hydraulic Fracturing Process." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1438968751.

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Potot, Cécile. "Etude hydrochimique du système aquifère de la basse vallée du Var Apport des éléments traces et des isotopes (Sr, Pb, δ18O, 226, 228Ra)". Phd thesis, Université de Nice Sophia-Antipolis, 2011. http://tel.archives-ouvertes.fr/tel-00586806.

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L'objectif principal de cette étude est d'améliorer les connaissances sur le système aquifère de la basse vallée du Var, principale ressource d'eau potable dans une région soumise à des influences méditerranéennes et alpines. La composition des éléments majeurs et traces, des isotopes de l'O, du Pb et du Sr a été déterminée à différentes périodes hydrologiques dans les eaux du fleuve Var, de ses affluents, de la nappe alluviale de la basse vallée, et des aquifères des calcaires jurassiques et des poudingues pliocènes, qui constituent le substratum des alluvions. Les concentrations mesurées son

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Palmer, Jacob N. "Radio propagation analysis for improved UAV data muling of surfaced underwater sensor nodes." Scholarly Commons, 2015. https://scholarlycommons.pacific.edu/uop_etds/218.

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The present work examines waypoint selection and evaluation mechanisms for data muling water sensor nodes via unmanned air vehicle. We present a mathematical model for predicting signal strength with respect to distance and height using a two-ray propagation model in conjunction with the individual radiation patterns of transmitting and receiving antennas. Signal quality over space is then be used to select best waypoints. Packet reception rate is related to the received signal strength indicator through experimentation and serves as a data efficiency indicator. Both models are then used to ga

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FERREIRA, ADEMAR de O. "Avaliação da radioatividade natural em algumas rochas graníticas do Estado do Paraná e sua utilização na construção civil." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10204.

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Made available in DSpace on 2014-10-09T12:35:58Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:50Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Zamin, Angela Maria. "A discursivização do local-fronteira no jornalismo: estudo de caso de programas jornalísticos em rádios comunitárias." Universidade do Vale do Rio do Sinos, 2008. http://www.repositorio.jesuita.org.br/handle/UNISINOS/2628.

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Made available in DSpace on 2015-03-05T18:24:07Z (GMT). No. of bitstreams: 0 Previous issue date: 25<br>Universidade do Vale do Rio dos Sinos<br>O presente trabalho investiga o funcionamento do Jornalismo no rádio comunitário, ao tomar como objeto de análise os programas jornalísticos Realidade Urgente e Bom Dia Cidade, das emissoras Nova Aurora FM, de Santana do Livramento/RS, e Elshaday FM, de Uruguaiana/RS. A preocupação central dessa investigação está pautada no modo como o local é discursivizado por esse Jornalismo. A escolha, portanto, vincula o rádio comunitário ao espaço local. Est

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KURAMOTO, GRACIELA B. "Estudo compartimental e dosimétrico do anti-CD20 marcado com 188Re." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26599.

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Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2016-08-25T11:05:49Z No. of bitstreams: 0<br>Made available in DSpace on 2016-08-25T11:05:49Z (GMT). No. of bitstreams: 0<br>A radioimunoterapia (RIT) faz uso de anticorpos monoclonais conjugados com radionuclídeos emissores α ou β-, ambos para terapia. O tratamento baseia-se na irradiação e destruição do tumor, preservando os órgãos normais quanto ao excesso de radiação. Radionuclídeos emissores β- como 90Y, 131I, 177Lu e 188Re, são úteis para o desenvolvimento de radiofármacos terapêuticos e, quando associado

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FELIX, Tânia Maria Dias. "A Rádio Escola como ferramenta pedagógica: a oralidade nas aulas de língua portuguesa no ensino fundamental." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/227.

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Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-01-08T17:05:43Z No. of bitstreams: 1 TÂNIA MARIA DIAS FELIX - DISSERTAÇÃO PROFLETRAS 2016..pdf: 696885 bytes, checksum: c934ac9181abb7e3566914d81182d122 (MD5)<br>Made available in DSpace on 2018-01-08T17:05:43Z (GMT). No. of bitstreams: 1 TÂNIA MARIA DIAS FELIX - DISSERTAÇÃO PROFLETRAS 2016..pdf: 696885 bytes, checksum: c934ac9181abb7e3566914d81182d122 (MD5) Previous issue date: 2016<br>Considerando o rádio não só como meio de comunicação de massa importante para divulgação da informação, superando expectativas de extinção

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Sabrera, Ortíz Soledad Amelia. "Radio comunitaria : alternativa de comunicación y desarrollo en el distrito de San Martín de Porres de Lima Metropolitana." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2002. https://hdl.handle.net/20.500.12672/268.

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En la tesis que presentamos “Radio Comunitaria: “Alternativa de Comunicación y Desarrollo en el Distrito de San Martín de Porres de Lima Metropolitana ” damos a conocer la trascendencia que tiene las radios comunitarias de los mercados en la sociedad como medios de expresión de los pueblos para rescatar lo sustancial y lo propio, y no ser asfixiados por la globalización. Las radios comunitarias, como prácticas de Comunicación Popular nos ayudan a percibir nuestra cultura, nuestra identidad y nuestra diversidad, por ser instrumentos de educación, cultura y entretenimiento, que se convierte en

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FONSECA, LEANDRO M. da. "Avaliação da radioatividade natural em tintas de uso comercial no Brasil." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26616.

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Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2016-08-26T12:05:53Z No. of bitstreams: 0<br>Made available in DSpace on 2016-08-26T12:05:53Z (GMT). No. of bitstreams: 0<br>A radioatividade natural presente em solos, rochas e materiais de construção, devida ao 40K e às séries radioativas do 232Th e 238U é a principal contribuição à exposição externa aos seres humanos. Neste trabalho, determinou-se as concentrações de atividade de 226Ra (da série do 238U), 232Th e 40K presentes em 50 amostras de tintas látex de cor branca comercializadas no Brasil, especificamente, 15 do tip

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David, Radu Alin. "Improving Channel Estimation and Tracking Performance in Distributed MIMO Communication Systems." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-dissertations/229.

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This dissertation develops and analyzes several techniques for improving channel estimation and tracking performance in distributed multi-input multi-output (D-MIMO) wireless communication systems. D-MIMO communication systems have been studied for the last decade and are known to offer the benefits of antenna arrays, e.g., improved range and data rates, to systems of single-antenna devices. D-MIMO communication systems are considered a promising technology for future wireless standards including advanced cellular communication systems. This dissertation considers problems related to channel e

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