Dissertations / Theses on the topic 'MF'
To see the other types of publications on this topic, follow the link: MF.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'MF.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Brown, William O. J. "MF radar interferometry." Thesis, University of Canterbury. Physics and Astronomy, 1992. http://hdl.handle.net/10092/8142.
Full textAbstract:
This thesis describes the development, operation and observations of interferometry experiments on two medium frequency spaced antennae radar operated by the Department of Physics and Astronomy of the University of Canterbury; the 2.4 MHz radar at Birdlings Flat near Christchurch, New Zealand, and the 2.9 MHz radar at Scott Base on Ross Island in the Antarctic. These radars are of a standard design and detect scattering from the D and lower E regions of the ionosphere in the mesosphere and lower thermosphere.
The interferometry techniques used were those of temporal, spatial and frequency domain interferometry which provide information on Doppler shifting and the directional and radial distribution of backscattered signals received by the radars. This project represents the first time that these techniques have been operated together on radars of the type used in this project. The techniques were also carried out in conjunction with the standard procedures used on these radars, that of Spaced Antennae Drifts with Full Correlation Analysis (FCA).
Various forms of interferometric analyses were carried out and comparisons were made between the results of interferometric analyses and those of more conventional techniques. For example a study was made of the relationship between interferometric and FCA velocities in which it was found that there was good agreement between the two methods, particularly when the scattering region does not change rapidly as it moves. Other analysis techniques investigated included examination of the angular distribution of scattering and aspect sensitivity, the statistical distributions of scattered signals, post beam steering, vertical velocities and momentum fluxes.
Frequency domain interferometry provided enhanced measurement of range and the scattering depth or distribution of range of scattered signals. Measurements of scattering depth clearly identified examples of thin layers or localized scatter. These localized scattering events appeared to be associated with either steady flow or long period variations in steady flow, for example with the semidiurnal solar tide. Aside from these events much of the scatter was observed to be anisotropic and also appeared to originate from a number of distributed scattering centres spread horizontally and vertically in a manner consistent with Fresnel scattering models.
2
Vaňo, Lukáš. "Marketing MF DNES a iDnes." Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-74080.
Full textAbstract:
This graduation thesis is aimed to identify the current situation of the newspapers Mladá fronta DNES and the internet portal iDNES.cz in the Czech media market. The print market, as well as the Internet market is undergoing some changes mainly caused by technological progress and society development. Both products are under control from the Mafra Media Group, which has to respond to the ongoing development of the Internet, as a dynamically growing media type at the expense of newspapers. The success is the close cooperation between both journal channels and frequent use of the possibilities of promotion in other media under the Mafra Media Group.
3
Vránová, Helena. "marketing HN,LN, MF Dnes a Práva." Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-71882.
Full textAbstract:
This thesis deals with marketing of the serious Czech newspapers (HN, LN, MF DNES and Právo) with a focus on possible models of their brand valuation. The main goal of this work is a marketing analysis of the four subjects using the electronic data sources. The analysis includes basic information about the publishers, their property relations and economic results for the period from 2005 to 2009. After that follows the introduction of the studied newspapers, including their content description, readers profile and new technologies. The aim of the practical part is also to choose appropriate method for evaluating the brands of the dailies. It was performed an external, financial and SWOT analysis to ensure correct application of the approach. Valuation results showed that the highest financial value has the brand Mladá Fronta DNES, the second is Právo, followed by Hospodářské noviny and Lidové noviny.
4
Good, Stephen D. "A Study into the Tradeoffs Between TDM / MF-SCPC and TDM / MF-TDMA Transport Options to Support IP-Based Multimedia Applications Under Different Load Conditions Within a Point-to-Multipoint Satellite Network." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32730.
Full textAbstract:
This thesis provides the reader with an overview of the many elements that are involved in geosynchronous satellite point-to-multipoint Internet Protocol (IP)-based multimedia communications design and also takes a deep dive into the analysis of a real-life scenario, using the TDM / MF-SCPC and TDM / MF-TDMA media access techniques.
This thesis starts with a discussion of satellite network topologies utilized within point-to-multipoint satellite communications followed by an overview of the satellite communications channel. A discussion on the intelligent and proper selection of modulation and coding follows. Descriptions and characteristics of the satellite access technologies chosen to be analyzed are next followed by a detailed description of Forward Error Correction (FEC) techniques and a discussion on network-wide tradeoffs so selecting different options.
The thesis then presents the results of a real-life scenario, investigating both TDM / MF-SCPC and TDM / MF-TDMA media access technique options, pointing out the tradeoffs brought to the forefront earlier in the study. The major takeaway is that there does not exist a one-size-fits-all solution that works for each and every scenario.Master of Science
5
Kovalam, Sujata. "MF radar observations of tides and planetary waves." Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phk878.pdf.
Full textAbstract:
Copies of previously published articles inserted. Bibliography: p. 185-200. Data obtained from six radar stations covering a wide latitude range has been used to determine the global distribution of planetary waves and tides. In the process a number of data analyses techniques were considered for their characterisation.
6
Vandepeer, Brenton. "A new mf Doppler radar for upper atmospheric research /." Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phv2273.pdf.
Full text
7
Sundman, Birgitta. "Reproduktionens inverkan på det slutliga tryckresultatet med djuptryck på MF-papper." Thesis, Högskolan Dalarna, Grafisk teknik, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:du-3569.
Full textAbstract:
To get an optimal print result with rotogravure on improved newsprint, MF-paper, knowledge aboutwhat adjustment that should be done through the whole production is needed. This degree project investigatesthe reproduction’s effect on the final print result.A test print is done at Quebecor World Nordic Interprint´s regular print unit. The evaluation of theprint shows how important the use of a unit adjusted ICC-profile is for the print quality. A comparisonbetween the two separation methods GCR and UCR shows that Interprint´s present ICC-profile, usingUCR as separation method, gives less missing dots. When the cylinder that prints the black ink isengraving whit a slower speed than normal the result shows that the colour becomes a little darker, thedetails becomes clear but the difference is very small.
8
Igarashi, Kiyoshi. "MF radar studies on the dynamics of the mesosphere and lower thermosphere." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/135950.
Full text
9
VIDAL, AMERICO ARIEL RUBIN DE CELIS. "MATHEMATICAL MODELLING OF THE INTERFERENCE PRODUCED BY VSAT/MF-TDMA SATELLITE NETWORKS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=30550@1.
Full textAbstract:
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Neste trabalho é desenvolvido um modelo matemático para descrever o comportamento estatístico da interferência produzida por redes VSAT/MFTDMA. O modelo proposto é utilizado para avaliar a interferência produzida pelos lances de subida de enlaces VSAT/MF-TDMA em enlaces de uma outra rede que utiliza um satélite vizinho. No modelo proposto, expressões analíticas foram desenvolvidas para levar em conta os efeitos de variações nas potências transmitidas, nos tamanhos das antenas e nos erros de apontamento das antenas transmissoras. As posições geográficas das estações terrenas são modeladas por processos pontuais de Poisson, bi-dimensionais. O modelo proposto é suficientemente geral para acomodar outros tipos de processos pontuais, além de situações envolvendo áreas de serviço contendo múltiplos tipos de distribuição geográfica das estações terrenas. Resultados numéricos obtidos com o modelo proposto são comparados àqueles baseados em valores reais de parâmetros (e.g. localização das estações terrenas, tamanhos de antenas e potências de transmissão) que foram fornecidos por um operador brasileiro de satélites.
In this work a mathematical model to describe the statistical behavior of the interference produced by VSAT/MF-TDMA networks is developed. The model is used to assess the interference produced by the uplinks of a VSAT/MF-TDMA network into links of a network that uses a neighboring satellite. In the proposed model, analytical expressions were developed to account for the effects of the varying transmitting powers, antenna sizes, and transmitting antenna pointing errors. The earth station locations are modeled by a two dimensional Poisson point process. The model is general enough to accommodate other types of point processes and can be applied to situations involving service areas containing multiple types of earth station geographical distribution. Numerical results obtained with the proposed model are compared to those based on the actual parameters values (e.g. earth station locations, antenna sizes and transmitting powers) which were provided by a Brazilian satellite operator.
10
Turhan, Birol Erdem. "Optimisation of MF DGNSS, maritime and aeronautical radiobeacon coverage by frequency re-assignment." Thesis, Bangor University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298601.
Full text
11
Maurya, Abhilasha. "Experimental and Computational Investigation of a Self-Centering Beam Moment Frame (SCB-MF)." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/70866.
Full textAbstract:
In the past two decades, there have been significant advances in the development of self-centering (SC) seismic force resisting systems. However, examples of SC systems used in practice are limited due to unusual field construction practices, high initial cost premiums and deformation incompatibility with the gravity framing. A self-centering beam moment frame (SCB-MF) has been developed that virtually eliminates residual drifts and concentrates the majority of structural damage in replaceable fuse elements. The SCB consists of a I-shaped steel beam augmented with a restoring force mechanism attached to the bottom flange and can be shop fabricated. Additionally, the SCB has been designed to eliminate the deformation incompatibility associated with the self-centering mechanism.
The SCB-MF system is investigated and developed through analytical, computational, and experimental means. The first phase of the work involves the development of the SCB concepts and the experimental program on five two-thirds scale SCB specimens. Key parameters were varied to investigate their effect on global system hysteretic response and their effect on system components. These large-scale experiments validated the performance of the system, allowed the investigation of detailing and construction methods, provided information on the behavior of the individual components of the system. The experimental results also provided data to confirm and calibrate computational models that can capable of capturing the salient features of the SCB-MF response on global and component level.
As a part of the second phase, a set of archetype buildings was designed using the self-centering beam moment frame (SCB-MF) to conduct a non-linear response history study. The study was conducted on a set of 9 archetype buildings. Four, twelve and twenty story frames, each with three levels of self-centering ratios representing partial and fully self-centering systems, were subjected to 44 ground motions scaled to two hazard levels. This study evaluated the performance of SCB-MFs in multi-story structures and investigated the probabilities of reaching limit states for earthquake events with varying recurrence period.
The experimental and computational studies described in this dissertation demonstrate that the SCB-MF for steel-framed buildings can satisfy the performance goals of virtually eliminating residual drift and concentrating structural damage in replaceable fuses even during large earthquakes.Ph. D.
12
Oliveira, Erika Fabiana de [UNESP]. "Avaliação da vazão do microaspersor Amanco MF, antes e após o uso com água residuária." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/93784.
Full textAbstract:
Made available in DSpace on 2014-06-11T19:26:46Z (GMT). No. of bitstreams: 0
Previous issue date: 2008-11-14Bitstream added on 2014-06-13T20:55:19Z : No. of bitstreams: 1
oliveira_ef_me_botfca.pdf: 373580 bytes, checksum: 7894815e03cdcc2c621d7434458eca47 (MD5)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Universidade Estadual Paulista (UNESP)
O presente trabalho foi realizado no Laboratório de Ensaio de Equipamentos de Irrigação do Departamento de Engenharia Rural da Universidade Estadual Paulista FCA- UNESP de Botucatu – SP, teve como objetivo avaliar a vazão do microaspersor Amanco MF Bocal verde claro 1,0mm, com vazão nominal de 43L h-1, antes e após o uso com água residuária, com ensaios em bancada. Na primeira fase da pesquisa 25 emissores novos foram separados aleatoriamente e realizados dois tipos de ensaios com água limpa, um com coleta dos dados dos emissores dispersos sobre a bancada e outro com a coleta de dados dos emissores situados em um único ponto da mesma, com intuito de observar qual a metodologia obteria melhores resultados, as pressões de ensaio foram 50, 100, 150, 200, 250 e 300 kPa . Numa segunda fase os emissores foram submetidos a 1000h operando com água de reúso. Ao término desse tempo, novamente foram submetidos às condições de ensaio inicial, para avaliar o desempenho do microaspersor, antes e depois de trabalhar com água de reúso, o parâmetro estudado foi a vazão média, para depois se calcular o desvio padrão, coeficiente de variação e curva vazão versus pressão. Ao final pode-se observar que o microaspersor Amanco MF bocal verde claro, obteve um melhor desempenho no ensaio realizado em um único ponto da bancada, ou seja, sob as mesmas variáveis e condições e que o uso da água residuária pouco influenciou nodesempenho dos emissores, pois a vazão média dos emissores depois de usado diminuiu em relação a vazão dos emissores antes do uso em 6,59%, o coeficiente de variação após o uso ficou em 5,115 %, aumentado em relação ao coeficiente de fabricação inicial que foi de 4,325%, o R² teve uma queda, passando de 0,9946 para 0,9898, mas o microaspersor continuou com uma boa classificação, de acordo com as normas da ABNT e ASAE.
This work was done in the Laboratory of Irrigations Equipments Tests of the de Departamento de Engenharia Rural of the Universidade Estadual Paulista FCAUNESP of Botucatu - SP, aimed to assess the flow of microsprinkler Amanco MF Mouthpiece light green 1.0 mm, with nominal flow rate of 43 l h-1, before and after use with wastewater, with tests on bench. In the first phase of the survey 25 new emitters were separate at random and made two types of tests with clean water, with a collection of data from transmitters scattered on the bench and another with the collection of data from transmitters located in a single point of the same, with order to see what the methodology obtain better results, the pressures of testing were 50, 100, 150, 200, 250 and 300 kPa.In a second stage, the emitters have been submitted to 1000h operating with water reuse. At the end of those hours, were again subject to the conditions of initial testing, to assess the performance of microsprinkler, before and after working with water for reuse, the parameter were studied flow average, and then to calculate the standard deviation, coefficient of variation curve and flow versus pressure. At the end data show that the microsprinkler Amanco MF mouthpiece light green, got a better performance in the test conducted in a single point on the bench, or under the same conditions and variables and that the use of wastewater little influence in performance of emitters, as the average flow of transmitters used after declined for a new 6,59%, the coefficient of variation after use was 5,115%, increased in proportion to the coefficient of manufacturing which was 4,325%, the R ² had a fall from 0,9946 to 0,9898, and microsprinklers continued with a good rating, according to the rules of ABNT and ASAE.
13
Christman, Alan M. "Validation of NEC-3 (Numerical Electromagnetics Code) with applications to MF and HF antenna technology." Ohio : Ohio University, 1990. http://www.ohiolink.edu/etd/view.cgi?ohiou1172605318.
Full text
14
Oliveira, Erika Fabiana de 1981. "Avaliação da vazão do microaspersor Amanco MF, antes e após o uso com água residuária /." Botucatu : [s.n.], 2008. http://hdl.handle.net/11449/93784.
Full textAbstract:
Orientador: Raimundo Leite CruzBanca: Antonio de Pádua Sousa
Banca: Helton Rogério Mazzer
Resumo: O presente trabalho foi realizado no Laboratório de Ensaio de Equipamentos de Irrigação do Departamento de Engenharia Rural da Universidade Estadual Paulista FCA- UNESP de Botucatu - SP, teve como objetivo avaliar a vazão do microaspersor Amanco MF Bocal verde claro 1,0mm, com vazão nominal de 43L h-1, antes e após o uso com água residuária, com ensaios em bancada. Na primeira fase da pesquisa 25 emissores novos foram separados aleatoriamente e realizados dois tipos de ensaios com água limpa, um com coleta dos dados dos emissores dispersos sobre a bancada e outro com a coleta de dados dos emissores situados em um único ponto da mesma, com intuito de observar qual a metodologia obteria melhores resultados, as pressões de ensaio foram 50, 100, 150, 200, 250 e 300 kPa . Numa segunda fase os emissores foram submetidos a 1000h operando com água de reúso. Ao término desse tempo, novamente foram submetidos às condições de ensaio inicial, para avaliar o desempenho do microaspersor, antes e depois de trabalhar com água de reúso, o parâmetro estudado foi a vazão média, para depois se calcular o desvio padrão, coeficiente de variação e curva vazão versus pressão. Ao final pode-se observar que o microaspersor Amanco MF bocal verde claro, obteve um melhor desempenho no ensaio realizado em um único ponto da bancada, ou seja, sob as mesmas variáveis e condições e que o uso da água residuária pouco influenciou nodesempenho dos emissores, pois a vazão média dos emissores depois de usado diminuiu em relação a vazão dos emissores antes do uso em 6,59%, o coeficiente de variação após o uso ficou em 5,115 %, aumentado em relação ao coeficiente de fabricação inicial que foi de 4,325%, o R² teve uma queda, passando de 0,9946 para 0,9898, mas o microaspersor continuou com uma boa classificação, de acordo com as normas da ABNT e ASAE.
Abstract: This work was done in the Laboratory of Irrigations Equipments Tests of the de Departamento de Engenharia Rural of the Universidade Estadual Paulista FCAUNESP of Botucatu - SP, aimed to assess the flow of microsprinkler Amanco MF Mouthpiece light green 1.0 mm, with nominal flow rate of 43 l h-1, before and after use with wastewater, with tests on bench. In the first phase of the survey 25 new emitters were separate at random and made two types of tests with clean water, with a collection of data from transmitters scattered on the bench and another with the collection of data from transmitters located in a single point of the same, with order to see what the methodology obtain better results, the pressures of testing were 50, 100, 150, 200, 250 and 300 kPa.In a second stage, the emitters have been submitted to 1000h operating with water reuse. At the end of those hours, were again subject to the conditions of initial testing, to assess the performance of microsprinkler, before and after working with water for reuse, the parameter were studied flow average, and then to calculate the standard deviation, coefficient of variation curve and flow versus pressure. At the end data show that the microsprinkler Amanco MF mouthpiece light green, got a better performance in the test conducted in a single point on the bench, or under the same conditions and variables and that the use of wastewater little influence in performance of emitters, as the average flow of transmitters used after declined for a new 6,59%, the coefficient of variation after use was 5,115%, increased in proportion to the coefficient of manufacturing which was 4,325%, the R ² had a fall from 0,9946 to 0,9898, and microsprinklers continued with a good rating, according to the rules of ABNT and ASAE.
Mestre
15
ALMEIDA, Darne Germano de. "Biodegradação de Bunker MF-380 por micro-organismos consorciados da região portuária de Suape -PE." Universidade Federal de Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/13376.
Full textAbstract:
Submitted by Eduardo Barros de Almeida Silva (eduardo.philippe@ufpe.br) on 2015-04-17T14:32:31Z
No. of bitstreams: 2
license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)
Dissertação Darne de Almeida.pdf: 10810403 bytes, checksum: 6ebdad1386dd91c308b1ec5f4712a663 (MD5)Made available in DSpace on 2015-04-17T14:32:31Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Darne de Almeida.pdf: 10810403 bytes, checksum: 6ebdad1386dd91c308b1ec5f4712a663 (MD5) Previous issue date: 2013-02-28
O presente estudo objetivou selecionar um consórcio microbiano misto quanto à biodegradação de bunker, bem como estudar as condições mais favoráveis para esse processo. Inicialmente, linhagens isoladas da água do mar da região portuária de Suape – PE foram submetidas a um teste para avaliar a ocorrência de interações microbianas e, em seguida, consórcios microbianos foram montados e o mais promissor foi selecionado por meio de indicadores redox. As linhagens do consórcio selecionado foram aclimatadas a teores crescentes de bunker (1%, 2% e 3%, v/v) e de NaCl (1%, 2% e 3%, p/v). Um ensaio prévio, em frascos agitados, foi realizado para caracterizar o crescimento do consórcio selecionado. Posteriormente, aplicouse um planejamento experimental 23 para investigar a influencia das variáveis (temperatura, pH, relação C:N) no processo de biodegradação e finalmente um experimento em biorreator empregando as melhores condições encontradas no planejamento experimental. A avaliação das interações microbianas permitiu compor oito diferentes consórcios (C1 a C8). Os testes com os indicadores redox apontaram o consórcio C5 como o mais promissor, sendo constituído por 3 bactérias, 1 levedura e 2 fungos filamentosos. No ensaio prévio de biodegradação, o consórcio C5 alcançou degradação dos constituintes alifáticos e aromáticos superior a 70% e a 30%, respectivamente, o que demonstrou a importância da execução precedente de um processo de aclimatação. As variáveis estudadas: relação C:N, temperatura e pH foram estatisticamente significativas nesta sequencia, obtendo-se uma biodegradação de hidrocarbonetos totais de 93,5%. O ensaio em biorreator foi conduzido nas melhores condições encontradas no planejamento experimental (temperatura = 25ºC, pH = 6, relação C:N = 150:1), e se alcançou níveis de degradação otimizados para os constituintes do bunker. Tanto no ensaio prévio de biodegradação como no experimento em biorreator, o consórcio C5 apresentou um crescimento apreciável em duas fases, sugerindo um comportamento diáuxico. Portanto, o consórcio C5 é capaz de degradar o óleo combustível marítimo em questão, podendo ser utilizado como agente biorremediador em técnicas de biorremediação ex-situ de ambientes poluídos por bunker.
16
Knoll, Jonathan Corey. "PROLONGATION, EXPANDING VARIATION, AND PITCH HIERARCHY: A STUDY OF FRED LERDAHL'S WAVES AND COFFIN HOLLOW." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1162851214.
Full text
17
Draper, Natalie R. "Water in the Glass." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1239301472.
Full text
18
Guerrero, A. C. "Aspects of the physiology of Antromycopsis smithii and Pleurotus ostreatus MF 33 in supplemented agricultural wastes." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383392.
Full text
19
Sá, Suyá Maia de. "Estudo do mecanismo de carregamento elétrico da superfície de nanopartículas de EDL-MF : um modelo alternativo." reponame:Repositório Institucional da UnB, 2013. http://repositorio.unb.br/handle/10482/13898.
Full textAbstract:
Dissertação (mestrado)—Universidade de Brasília, Programa de Pós-Graduação em Ciência de Materiais, 2013.Submitted by Alaíde Gonçalves dos Santos (alaide@unb.br) on 2013-08-08T12:00:17Z No. of bitstreams: 1 2013_SuyaMaiadeSa.pdf: 1643484 bytes, checksum: ab6e384ea6c10598298e962f8e9023b3 (MD5)
Approved for entry into archive by Guimaraes Jacqueline(jacqueline.guimaraes@bce.unb.br) on 2013-08-08T14:28:22Z (GMT) No. of bitstreams: 1 2013_SuyaMaiadeSa.pdf: 1643484 bytes, checksum: ab6e384ea6c10598298e962f8e9023b3 (MD5)
Made available in DSpace on 2013-08-08T14:28:22Z (GMT). No. of bitstreams: 1 2013_SuyaMaiadeSa.pdf: 1643484 bytes, checksum: ab6e384ea6c10598298e962f8e9023b3 (MD5)
A determinação da densidade superficial de carga é um tema de grande interesse na ciência coloidal. No caso de fluidos magnéticos com dupla camada elétrica (EDL-MF), o carregamento da superfície resulta da protonação/desprotonação de sítios na superfície dos nanocristais e, portanto, pode ser ajustado pelo pH do meio. Na última década, a partir de um método potenciométrico-condutimétrico (MPC) baseado em titulações simultâneas, foi proposta uma metodologia para o cálculo da concentração dos sítios superficiais carregados de nanopartículas de EDL-MF e caracterizar sua a pH-dependência com o modelo de 2-pK. Neste trabalho, propomos um modelo alternativo para determinar a densidade superficial de carga estrutural de nanopartículas de EDL-MF, que combina os princípios da titulação em massa e do MPC. Nesta abordagem, denominada Método Potenciométrico-Condutimétrico Modificado (MPCM), realizamos titulações potenciométricas-condutimétricas simultâneas em amostras de EDL-MF a partir de meio ácido (pH = 2,0). Em seguida, na região de titulação da superfície da partícula, deduzimos a quantidade de sítios protonados/desprotonados a partir do balanço de massa medindo-se a concentração dos íons hidrônio remanescentes na dispersão após cada adição de titulante. Os resultados do valor de saturação da densidade de carga de superfície obtidos com o MPCM estão em boa concordância com o do MPC. Além disso, a pH-dependência da carga de superfície determinada usando o MPCM é mais realista em comparação com o MPC, uma vez que não requer o estado de equilíbrio para o processo de transferência de prótons entre a superfície e o seio da dispersão. _______________________________________________________________________________________ ABSTRACT
The surface charge determination is a topic of outstanding interest in the colloid science. In the case of electric double layered magnetic fluids (EDL-MF), the surface charging arises from protonation/deprotonation equilibria on the nanocrystal surface and therefore can be tuned by the pH of the medium. In the last decade, from a potentiometric-conductimetric method (PCM) based on simultaneous titrations it has evidenced that EDL-MF behaves as a mixture of strong and weak diprotic acids. The former is related to the colloid bulk solution, and the latter is associated to the particle surface. The concentration of the charged surface sites was achieved using the mass balance. Then, by using a 2-pK model it has been possible to determine the pH dependence of the surface charge density. In this work we propose an alternative model to determine of the structural surface charge density of EDL-MF nanoparticles which combines the principles of the mass titration [2] and the PCM. In this approach, called Modified Potentiometric-Conductimetric Method (MPCM), we perform simultaneous potentiometric-conductimetric titrations of the EDL-MF samples starting from acidic medium (pH = 2.0). Then, in the region of the particle surface titration, we deduce the amounts of surface adsorbed/desorbed protons from the material balance measuring the concentration of hydronium ions remaining in dispersion after each addition of titrant. The results of the saturation value of the surface charge density obtained with the MPCM are in very good agreement with that of PCM. Moreover, the pH-dependence of the surface charge determined using the MPCM is more realistic compared with the PCM since it does not require the equilibrium state for the surface protonation/deprotonation process.
20
Chen, Chao-Min Amy. "Identification and characterization of I-mf, a novel myogenic repressor that interacts with MyoD family members /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/5060.
Full text
21
van, Heck Sjoerd. "The dynamics of issue attention." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19230.
Full textAbstract:
Das erste empirischen Kapitel analysiert die ,Parteieninteraktion’ im Wettbewerb. Parteien sind empfänglich für die Agenda ihrer Mitbewerber. Allerdings sind nicht alle Parteien in gleichem Maße empfänglich. Erfahrung in Koalitionen sollte etablierte Regierungsparteien empfänglicher für Signale der wettbewerblichen Umgebung machen, wohingegen herausfordernde Parteien ihre eigene Agenda antreiben und Veränderungen in der system-internen Salienz von Themenbereichen ignorieren. Weiterhin nehmen die Parteiführungen eine größere Notwendigkeit wahr, auf Konkurrenten zu reagieren und auf der Welle der Themen des Parteisystems mitzuschwimmen. Aktivisten sind stattdessen eher von policy-seeking-Motivationen angetrieben und bevorzugen eher, dass die Partei thematisch einen traditionellen Fokus beibehält.
Das zweite empirische Kapitel behandelt die Reichweite von parteilichen Themenkatalogen. Das Argument ist dabei, dass herausfordernde Parteien den Status quo zu ändern suchen, indem sie sich auf wenige Themen fokussieren. Etablierte Parteien verteilen ihre Aufmerksamkeit auf eine Vielzahl von Themen. Weiterhin ändern etablierte Parteien die Reichweite ihrer Agenda, wenn sie mit elektoralen Verlusten konfrontiert, oder von Regierungen ausgeschlossen sind. Parteiführungen versuchen breitgefächert anzusprechen, wohingegen Aktivisten wollen, dass zur Parteibasis gesprochen wird.
Der dritte empirische Teil behandelt Innovationen auf dem Markt der politischen Themen. Das Kapitel untersucht der Einfluss von Wählerunterstüzung für grüne, rechtsaußen- und euroskeptische Parteien auf thematische Agenden. Neben Unterstützung für grüne und rechtsaußen Parteien, provoziert auch der Erfolg von euroskeptischen Parteien andere Parteien dazu, ihre thematischen Berücksichtigungsstrategien anzupassen. Dieser Effekt ist konditional und hängt von der Salienz ab, die die herausfordernde Partei dem Thema zumisst.The first empirical chapter analyses `party interaction' in issue competition. It shows that parties are responsive to the agendas of their competitors. Not all parties are equally responsive. Experience in government coalitions makes mainstream parties more `sensitive' towards their competitive environment whereas challengers push forward their own agendas and ignore systemic salience shifts. Furthermore, party leaders perceive the need for their party to respond to competitors more strongly than do activists. Activists are driven by policy-seeking motivations and would like to see the party focus on its traditional agenda. The second empirical chapter deals with the scope of parties' issue agendas. Why do parties sometimes offer a broad agenda to voters, whereas at other times they confine their policy appeals? Challenger parties seek to change the political status quo by focusing on a few issues only. Mainstream parties distribute their attention across a wide range of issues. Moreover, mainstream parties change the scope of their agenda when after electoral losses or when excluded from office. This depends on intra-party politics. Leaders seek to satisfy vote- and office-seeking motivations and `appeal broadly', activist want the party to `speak to the base'. The third empirical chapter deals with innovations in political issue-markets. It examines how parties respond to the pressure to address new issues. This chapter examines the impact of electoral support for green, far right and Eurosceptic parties on the issue agendas of other parties. In addition to green and far right support, Eurosceptic party success also provokes other parties to adjust their salience strategies. This effect is conditional: if Eurosceptic parties regard European integration issues as particularly important, other parties adapt and shift salience to this issue dimension. For green and far right parties such a conditional effect is absent.
22
Wolinski, André Luis Tadeu Olivo. "Efeitos do derrame experimental de oleo Bunker MF-180 em marismas da Baia de Paranagua (Parana, Brasil)." reponame:Repositório Institucional da UFPR, 2009. http://hdl.handle.net/1884/18862.
Full text
23
Kaverine, Evgueni. "Contribution à la conception d'antennes MF, HF et VHF miniatures pour des applications mobiles, terrestres et maritimes." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S152.
Full textAbstract:
Les objectifs de ce travail concernent l'étude, la conception et la caractérisation d'antennes miniatures actives ou passives, large bande ou bande étroite fonctionnant en bandes MF, HF et VHF. Le manuscrit est divisé en cinq parties : La première partie présente un système de caractérisation d'antennes qui a été développé, validé et utilisé pour tous les aériens conçus. Ce système, basé sur une cellule à plaque parallèles (PPC), permet un large spectre de mesures telles que la mesure du gain, du point de compression, de l'intermodulation et de la sensibilité via une méthode rayonnée, particulièrement intéressante dans le cas des antennes actives intégrées. La deuxième partie concerne les antennes solénoïdales sur ferrite. L'utilisation de simulateurs électromagnétiques 3D a permis d'obtenir des résultats qui sont comparés à la théorie proposée dans la littérature. Les principaux systèmes d'adaptation d'impédance sont également étudiés. La troisième partie met en avant la possibilité de concevoir des antennes à substrat ferromagnétique de géométrie non conventionnelle en utilisant des matériaux composites. Deux antennes miniatures fabriquées et fonctionnant en bande VHF permettent d'illustrer ce point. Dans la quatrième partie, nous présentons un concept d'antennes à substrat ferromagnétique partiellement saturé. L'utilisation d'une source de champ magnétique statique associée à un matériau initialement dispersif permet de constater un certain nombre de phénomènes intéressants, tels que l'amélioration de l'efficacité tout en préservant l'adaptation de l'antenne ou bien la création de directivité sur des antennes électriquement très compactes. La dernière partie présente la valorisation du travail à travers un projet de télécommunication hertzienne longue portée s'inscrivant dans le cadre de la navigation maritimeThe objectives of this work concern the study, the design and the measurement of miniaturized passive and active, broadband and narrowband antennas for MF, HF and VHF frequency bands. The thesis is divided into five parts : The first part deals with a measurement system, which has been developed, validated and used for all conceived aerials. The system is based on a parallel plate cell (PPC) and allows an evaluation of the gain, the compression point, the interception point and the sensitivity using a radiative method particularly useful in the case of active integrated antennas. The second part concerns solenoidal ferrite antennas. The results obtained from electromagnetic 3D simulators were compared to the state of the art theory. Main matching technics have also been studied. The third part put the light on the possibility of development of arbitrary shaped antennas on a ferromagnetic substrate using a composite material. Two antennas developed for the VHF band, confirm this point. In the fourth part, we present a concept of antennas on a partially saturated ferromagnetic substrate. A static magnetic field associated with an initially lossy material brings up some interesting phenomena such as an increased efficiency without a degradation of the impedance matching or the directivity with very small antennas. The last part presents an application of the work across a project dedicated to long distance telecommunications in marine navigation
24
Sjöstig, Ebba. "Att samordna CAD och AMA-koder : Hur säkerställs kvaliteten mellan ritning, MF och TB i ett projekt?" Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79398.
Full text
25
Merz, Nicolas. "The Manifesto-Media Link: How Mass Media Mediate Manifesto Messages." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/18863.
Full textAbstract:
Diese Arbeit geht der Frage nach, inwiefern die Medien während des Wahl-kampfs über die Wahlprogramme der Parteien berichten. Die Wahlprogramme der Parteien enthalten Informationen darüber, was Parteien nach der Wahl vorhaben. Allerdings lesen wenige Wählerinnen und Wähler Wahlprogramme. Die vergangene Forschung über und mit Wahlprogrammdaten hat bisher angenommen, dass der Inhalt von Wahlprogrammen von den Medien verbreitet wird. Diese Doktorarbeit untersucht diese Annahme empirisch und analysiert, ob und wie Massenmedien während des Wahlkampfs über die Inhalte der Wahlprogramme berichten. Wenn Massenmedien nicht die Inhalte der Wahlprogramme verbreiten würden, hätten Bürgerinnen und Bürger kaum Chancen sich über das programmatische Angebot der Parteien zu informieren. In dieser Arbeit wird das Konzept des Manifesto-Medien-Links entwickelt. Das Konzept bringt Theorien des Parteienwettbewerbs und Theorien der Medienselektion zusammen. Der Manifesto-Medien-Link formuliert drei Bedingungen, welche empirisch getestet werden können. Diese sind: Erstens, Medienberichterstattung und Wahlprogramme müssen zumindest zu einem gewissen Grad dieselben Themen diskutieren. Zweitens, Journalisten müssen Sachfragen mit jenen Parteien verknüpfen, welche diese Themen in ihren Wahlprogrammen stärker betonen als ihre Konkurrenten, um Wählerinnen und Wähler über die Prioritäten der Parteien zu informieren. Drittens, Medien müssen die ideologische Orientierung einer Partei sowie Veränderungen dieser korrekt wiedergeben. Methodisch werden in der Arbeit Wahlprogramm- und Mediendaten kombiniert. Die Ergebnisse zeigen, dass der Manifesto-Medien-Link relativ stabil ist. Außerdem wird gezeigt, dass es nur geringe systematische Verzerrungen zugunsten bestimmter Parteien gibt. Jedoch zeigen sich Unterschiede zwischen Qualitäts- und Boulevardmedien. Die Ergebnisse haben Implikationen für unser Verständnis von politischer Repräsentation und den politischen Wettbewerb.This study analyzes whether media coverage covers messages from parties’ electoral programs (manifestos). Electoral programs contain detailed information on a party’s future policy-making. However, few voters read electoral programs. Still, prior research often assumed that the content of manifestos is known to voters because media disseminate the content of manifestos to voters. This dissertation evaluates this “mediation assumption” empirically, and analyzes whether and how the mass media cover parties’ electoral programs during the electoral campaign. If media coverage did not reflect parties’ electoral programs, citizens would have no chance to base their vote choice on evaluations of those programs. This study introduces the concept of the manifesto-media link in order to describe how media coverage can reflect programmatic offers. The manifesto-media link is formulated as three conditions that can be empirically evaluated and tested in a similar way to the conditions of the responsible party model. These are: First, media must cover similar issues to those that parties cover in their electoral programs. Second, media coverage must link issues with parties that emphasize these issues more than their competitors, in order to inform about the parties’ issue priorities. Third, media must frame parties as left or right in a way that represents how parties emphasize left or right positions in their own manifestos. Methodologically, the study combines secondary content analytical data on media coverage during the electoral campaign with data based on electoral programs. The findings suggest that the manifesto-media link is stable and robust. There is little to no systematic bias in favor of a certain type of party, however there are differences between quality and tabloid media. These findings contribute to our understanding of political representation and the functioning of political competition.
26
栖川, 宜夫. "AMD-MF法による原子核の液気相転移の研究." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150821.
Full text
27
Lehmann, Eraldo Luiz 1981. "Avaliação de um sistema FI-HG-MF-AAS e extração assistida pro micro-onda na especiação de arsênio inorgânico." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248601.
Full textAbstract:
Orientadores: Marco Aurélio Zezzi Arruda, Anne-Hélène FostierDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-20T06:38:49Z (GMT). No. of bitstreams: 1 Lehmann_EraldoLuiz_M.pdf: 2472831 bytes, checksum: 9197e3f8344d1f42efcc6e44cd1ffe01 (MD5) Previous issue date: 2012
Resumo: Nessa Dissertação foram avaliados um sistema de injeção em fluxo com geração de hidretos acoplado a um espectrômetro de absorção atõmica com atomizador forno metálico de liga Inconel 600® (FI-HG-MF-AAS), bem como a técnica de extração assistida por micro-onda (MAE) como método de preparo de amostra para especiação de arsênio inorgânico. Para o sistema FI-HG-MF-AAS, condições brandas (pH tamponado em 4,5 e concentração de tetraidridoborato(1-) 0,1% (m/v)) foram utilizadas para que apenas a espécie Asi(III) gerasse o seu respectivo hidreto (arsano - AsH3), atingindo-se limites de detecção de 2,0 mg L e quantificação de 6,6 mg L, tornando o método adequado para uso em análises que atendam a portaria de potabilidade de água de acordo com o Ministério da Saúde e Organização Mundial da Saúde (WHO). O Asi(V) não apresentou qualquer sinal nas condições brandas, e apenas o uso de L-cisteína como pré-redutor foi eficiente para sua conversão a Asi(III). O teste de recuperação foi realizado utilizando material de referência NIST 1643e, Traços de elementos em água, com 60,45 mg L de arsênio total. O resultado mostra que Asi(III) não está presente na amostra em concentração acima do limite de detecção, e usando L-cisteína na concentração de 3% (m/v), obteve-se 60,5 mg L de Asi total, atingindo 100% de recuperação. A técnica de extração assistida por micro-onda mostrou-se eficaz para a extração de As total no material certificado de plâncton BCR414, atingindo um nível 93% de recuperação. Também se mostrou eficiente para manter as espécies de As inorgânico (Asi(III) e Asi(V)) inalteradas, sendo assim uma técnica promissora para o preparo de amostras para a análise de especiação
Abstract: In this work a Flow Injection - Hydride Generation - Metallic Furnace - Atomic Absorption Spectrometry (FI-HG-MF-AAS) system was evaluated, using an Incone600 ® alloy tube as a metallic oven, as well as the technique of microwave-assisted extraction (MAE) for sample preparation aiming speciation of inorganic arsenic. For the FI-HG-MF-AAS system, mild conditions (buffered media at pH 4.5 and concentration of tetrahydridoborate (1-) 0.1% (m/v)) allow that only iAs(III) generates hydride (arsane - AsH3), reaching a detection limit of 2.0 m gL and limit of quantification of 6.6 mg L, making suitable for its use in analysis according to Brazilian's Ministry of Health and World Health Organization (WHO) for drinking water. The inorganic As(V) did not show signal in mild conditions, and only the use of L-cysteine as pre-reducing agent was efficient in its conversion to inorganic As(III). The recovery test was carried out using reference material NIST 1643e, Trace elements in water, with 60.45 mg L of total arsenic. The result shows that inorganic As(III) is not present at concentration above the limit of detection, and using L-cysteine 3% (w/v), was obtain a total inorganic As concentration of 60.5 mg L, reaching a recovery of 100%. Microwave-assisted extraction technique was effective for the extraction of the total arsenic in certified plankton BCR414material, reaching a recovery level of 93%. Additionally, it also proved to be effective in preserving the species of unchanged inorganic arsenic, making it a promising technique for sample preparation aiming a speciation analyzes
Mestrado
Quimica Analitica
Mestre em Química
28
Galazzi, Rodrigo Moretto 1988. "Emprego da técnica MF-HG-AAS na determinação de estanho : análise de parâmetros analíticos e morfológicos do atomizador metálico." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248591.
Full textAbstract:
Orientador: Marco Aurélio Zezzi ArrudaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-22T10:57:39Z (GMT). No. of bitstreams: 1 Galazzi_RodrigoMoretto_M.pdf: 2262907 bytes, checksum: fb6e92051f6858cd925c525071ce6540 (MD5) Previous issue date: 2013
Resumo: Nessa dissertação, otimizou-se um método para a determinação de estanho (Sn) em amostras biológicas empregando a técnica de Espectrometria de Absorção Atômica por Geração de Hidretos e Forno Metálico (MF-HG-AAS, do inglês Metallic Furnace Hydride Generation Atomic Absorption Spectrometry). Foram avaliadas algumas variáveis químicas como o tipo e concentração do carregador/diluente da solução padrão, concentração do redutor tetraidridoborato (-1) de sódio (THB) e concentração de hidróxido de sódio, bem como variáveis físicas do sistema dentre elas a vazão de carregador, proporção de acetileno:ar na chama, volume de solução injetado, vazão de argônio como gás de arraste, vazão de água no nebulizador e área total de furos no tubo metalico Inconel600®. Foi realizado um estudo do efeito de memória observado em condições de chama oxidante nas vazões de 1,5:9; 1,4:9; 1,3:9; 1,4:10; 1,4:8 e 1,5:11 L min de acetileno:ar, respectivamente. Em todas essas proporções de chama diferentes da otimizada (1,5:10 L min acetileno:ar) há efeito de memória, o que é extremamente indesejável. Após a otimização do sistema, foram realizados testes de exatidão e precisão do mesmo com os materiais PACS-2 (sedimento) e SRM 1643e (amostra de água) em que, em ambos, foi possível recuperar o Sn adicionado obtendo limites de detecção (LD) de 7,1 mg kg e 7,6 mg L, respectivamente. Um estudo com concomitantes foi realizado para avaliar se algum dos elementos em questão poderia interferir na determinação do Sn. Foram estudados como possíveis concomitantes o cobre, chumbo e zinco em três níveis diferentes. Somente o cobre, nas razões de 1:10 e 1:20 (Sn:concomitante), interferiu na detecção de Sn. Por fim, a morfologia do atomizador foi avaliada por meio da técnica de Microscopia Eletrônica de Varredura (SEM, do inglês Scanning Electron Microscopy). Mesmo após a realização de todos os experimentos envolvendo a otimização do sistema e análise das amostras, os principais constituintes do tubo metálico Inconel600® (ferro, níquel e cromo) permaneceram homogeneamente distribuídos, indicando que esses metais podem não participar da rota de atomização do Sn. Além disso, houve formação de óxidos no atomizador que, juntamente com o uso de uma chama oxidante, sugerem uma rota de atomização do Sn via formação de óxidos. Considerando os LD, bem como a exatidão e precisão por meio da recuperação de Sn obtida nas amostras, constata-se a potencialidade da MF-HG-AAS frente a outras técnicas empregadas na determinação de Sn
Abstract: In this work, a Metallic Furnace Hydride Generation Atomic Absorption Spectrometry (MF-HG-AAS) was optimized for tin (Sn) determination in biological samples. Chemical variables, such as the type and carrier concentration, the sodium tetrahydrideborate (-1) (THB), and the sodium hydroxide concentration, as well as physical variables, such as carrier flow-rate, ratio of acetylene and air in the flame, injection volume, argon flow-rate as carrier of stannane, water flow-rate in nebulizer and total hole area of a Inconel600® metallic furnace were evaluated. A study of a memory effect observed in oxidant flame conditions such as 1.5:9; 1.4:9; 1.3:9; 1.4:10; 1.4:8 e 1.5:11 L minof acetylene:air, respectively, was realized. In any other flame flow-rate, which the optimized flame ratio (1.5:10 L min acetylene:air) was observed a memory effect, which is very undesirable. After optimizing of the system, test of accuracy and precision were realized with the PACS-2 (sediment) and SRM 1643e (water sample) materials wherein, in both, a recovery of the Sn added to the samples was possible with limits of detection (LOD) as 7,1 mg kg and 7,6 mg L, respectively. A concomitant study was carried out for checking the interferences in the Sn determination. Copper, lead and zinc at three different levels were studied as possible concomitants. Only copper, at 1:10 and 1:20 (Sn:concomitant) ratios interfered in the determination of Sn. Finally, the morphology of the atomizer employed was evaluated through Scanning Electron Microscopy (SEM) technique. Even after carrying out all experiments involved in the optimization of the system and in the sample analysis, the main constituents of Inconel600® metallic furnace (iron, nickel and chromium) remained homogeneously distributed, indicating which these elements may not participate of the Sn atomization route. Moreover, the oxide formation in the atomizer was detected, which, together with an oxidant flame used, suggests the Sn atomization route via oxides formation. Considering the LOD, as well the accuracy and precision through the Sn recovery in the samples, the MF-HG-AAS potentially is well pointed out when it is compared to other techniques employed for Sn determination
Mestrado
Quimica Analitica
Mestre em Química
29
DECAP, GUILLAUME. "ETUDE STRUCTURALE ET MAGNETIQUE DE PHASES FLUOREES DANS LES SYSTEMES PbF2-MF-2M'F3 (M=MN²+, FE2+; M'=FE3+, Al3+)." Rennes 1, 1994. http://www.theses.fr/1994REN10069.
Full textAbstract:
Pb#2mnfe#2f#1#2, 3h#2o est le premier fluorure a triples chaines isolees d'octaedres contenant du fer. Partant de ce compose, deux phases isotypes, pb#2fe#3f#1#2, 3h#2o et pb#1#. #5fe#3f#1#2, 3h#2o, ont ete obtenues par synthese hydrothermale basse temperature. Les structures cristallines de ces composes ont ete etablies par diffraction de rayons x sur monocristal ou sur poudre. L'etude thermique de ces trois hydrates a ete realisee par thermodiffractometrie, diffraction neutronique et spectrometrie mossbauer. La deshydratation de pb#1#. #5fe#3f#1#2, 3h#2o a permis de stabiliser la phase anhydre. Les temperatures d'ordre magnetique sont comprises entre 17 et 33 k. En accord avec la topologie cationique, le caractere magnetiquement frustre de ces composes a ete mise en evidence par diffraction neutronique et spectrometrie mossbauer sous champ. Dans les binaires pbf#2mf#3, deux nouveaux composes ont ete synthetises: pb#3fe#2f#1#2 et pb#3al#2f#1#2. Ils presentent une configuration en tetrameres (m#4f#2#0)#8# isoles inseres dans un sous-reseau de fluors independants. Les deux composes se differencient par la disposition des tetrameres dans le sous-reseau. Le comportement magnetique du groupement (fe#4f#2#0) est etudie par spectrometrie mossbauer a tres basse temperature (21 mk) et est discute en terme de clusters magnetiques isoles. La structure de la phase de composition voisine, pb#5al#3f#1#9, a ete reexaminee. L'hydrate kpbfef#6, h#2o a ete egalement synthetise. Sa structure, formee d'octaedres (fef#6) isoles, est apparentee a la famille des elpasolites. Une etude de deshydratation a ete menee par thermodiffractometrie. Les mesures mossbauer a tres basses temperatures permettent d'observer un ordre magnetique tridimensionnel a tn 3. 7 k
30
Lamirault, Sylvie. "Comportement du cuivre dans les mélanges HF-MF (M=K ou NH) fondus utilisés pour l'obtention électrolytique du fluor." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606947z.
Full text
31
Pereira, Geovane Módena. "Criptografia de qubits de férmions de Majorana por meio de estados ligados no contínuo." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152724.
Full textAbstract:
Submitted by GEOVANE MODENA PEREIRA null (geovanemodena@hotmail.com) on 2018-02-10T03:04:38Z
No. of bitstreams: 1
Dissertação Geovane - Criptografia de Qubits de Férmions de Majorana por meio de Estados Ligados no Contínuo.pdf: 7524654 bytes, checksum: 0bd9409e8fa9c0c2da9190e44f4cfa33 (MD5)Approved for entry into archive by Ana Paula Santulo Custódio de Medeiros null (asantulo@rc.unesp.br) on 2018-02-14T16:11:32Z (GMT) No. of bitstreams: 1 pereira_gm_me_rcla.pdf: 7420427 bytes, checksum: 0a0aec5beec2ecdd26883e0f4524844f (MD5)
Made available in DSpace on 2018-02-14T16:11:32Z (GMT). No. of bitstreams: 1 pereira_gm_me_rcla.pdf: 7420427 bytes, checksum: 0a0aec5beec2ecdd26883e0f4524844f (MD5) Previous issue date: 2017-12-01
Nós investigamos teoricamente uma cadeia topológica de Kitaev conectada a dois pontos quânticos (QDs) hibridizados a terminais metálicos. Neste sistema, observamos o surgimento de dois fenômenos marcantes: (i) uma decriptografia do Férmion de Majorana (MF), que é detectado por meio de medições de condutância devido ao estado de vazamento assimétrico do qubit de MFs nos QDs; (ii) criptografia desse qubit em ambos os QDs quando o vazamento é simétrico. Em tal regime, temos portanto a criptografia proposta, uma vez que o qubit de MFs separa-se nos QDs como estados ligados no contínuo (BICs), os quais não são detectáveis em experimentos de condutância.
We theoretically investigate a topological Kitaev chain connected to a double quantum-dot (QD) setup hybridized with metallic leads. In this system, we observe the emergence of two striking phenomena: i) a decrypted Majorana Fermion (MF) - qubit recorded over a single QD, which is detectable by means of conductance measurements due to the asymmetrical MF-leaked state into the QDs; ii) an encrypted qubit recorded in both QDs when the leakage is symmetrical. In such a regime, we have a cryptography-like manifestation, since the MF-qubit becomes bound states in the continuum, which is not detectable in conductance experiments.
32
Isoda, Fusako. "A study of wind oscillations in the mesosphere and lower thermosphere at low latitudes observed with MF and meteor radars." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/148784.
Full text
33
Benedito, Luiz Eduardo Celino. "Elaboração, caracterização físico-química e condutividade AC de colóides magnéticos do tipo EDL-MF à base de ferrita de cobalto." reponame:Repositório Institucional da UnB, 2010. http://repositorio.unb.br/handle/10482/8901.
Full textAbstract:
Dissertação (mestrado)—Universidade de Brasília, Instituto de Química, 2010.Submitted by wiliam de oliveira aguiar (wiliam@bce.unb.br) on 2011-07-01T20:04:15Z No. of bitstreams: 1 2010_LuizEduardoCelinoBenedito.pdf: 1715680 bytes, checksum: 8d24d55931f7cf8d7f3dd42d1ee9cdcd (MD5)
Approved for entry into archive by Guilherme Lourenço Machado(gui.admin@gmail.com) on 2011-07-04T12:32:19Z (GMT) No. of bitstreams: 1 2010_LuizEduardoCelinoBenedito.pdf: 1715680 bytes, checksum: 8d24d55931f7cf8d7f3dd42d1ee9cdcd (MD5)
Made available in DSpace on 2011-07-04T12:32:19Z (GMT). No. of bitstreams: 1 2010_LuizEduardoCelinoBenedito.pdf: 1715680 bytes, checksum: 8d24d55931f7cf8d7f3dd42d1ee9cdcd (MD5)
Fluidos magnéticos do tipo EDL-MF (Electric Double Layered Magnetic Fluids) são dispersões coloidais de nanopartículas do tipo ferritas espinélio peptizadas em meio aquoso ácido ou básico. Como sendo um material impar, magnético e fluido ao mesmo tempo, vem sendo empregado em nanotecnologia na indústria e mais recentemente na medicina e áreas afins. Avanços na caracterização deste tipo de material têm sido primordial neste sentido. O fato de serem amostras muito absorventes limita o emprego de técnicas espectroscópicas convencionais de análise na região do UV-VIS. Por outro lado, o recente emprego de técnicas eletroquímicas que, diferentemente, exploram as propriedades elétricas do meio, se torna neste caso uma ferramenta poderosa. Neste trabalho procuramos investigar a condução elétrica de um EDL-MF a base de ferrita de cobalto. As amostras investigadas foram sintetizadas quimicamente utilizando-se o método “bottom-up” e caracterizadas à luz de um modelo “core-shell” onde um background teóricoexperimental é apresentado. Em seguida, exploramos questões de estabilidade coloidal das mesmas segundo um modelo do tipo DLVO a partir de medidas experimentais de titulações condutimétricas e potenciométricas simultâneas, com a determinação da densidade superficial de carga elétrica e as constantes de equilíbrio dos sítios ácidos superficiais que lhe dão origem. Finalmente, através de medidas condutimétricas AC procuramos investigar a contribuição das nanopartículas para a condução elétrica de um EDL-MF. Num primeiro experimento as nanopartículas foram floculadas e a condutividade AC do sobrenadante comparada àquela do colóide original. Em um segundo experimento a condutividade AC da amostra foi medida em função do aumento da viscosidade pela adição de glicerol no sentido de reduzir uma possível contribuição das nanopartículas para a condução elétrica do meio pela redução drástica de sua mobilidade em relação àquela dos íons do meio carreador. A partir da análise destes resultados nenhuma evidência foi encontrada no sentido de uma contribuição das partículas para a condutividade AC global do meio. ______________________________________________________________________________ ABSTRACT
Electric Double Layered Magnetic Fluids (EDL-MF) are colloidal dispersions of spinel ferrites nanoparticles peptized in aqueous acid or base medium. As being an odd material, magnetic and fluid at the same time, it has been used in industrial nanotechnology and more recently in medicine and related areas. In this regard, advances in characterization have been of paramount importance. The fact that they are highly absorbent samples limits the use of conventional spectroscopic analysis in the UV-VIS range. However, the recent use of electrochemical techniques that, unlike spectroscopic ones, explore the electrical properties of the medium, becomes a powerful tool. In this work we investigate the electrical conduction of an EDL-MF based on cobalt ferrite. The investigated samples were chemically synthesized using a bottom-up method and characterized by a core-shell model. In this context, a theoretical and experimental background is first presented. Then, we explore the colloidal stability using a DLVO approach using experimental measurements of simultaneous conductimetric and potentiometric titration. It allows the determination of the equilibrium constants of surface acid sites and the consequent surface density of electric charge. Finally, by using AC conductivity measurements, we investigated the contribution of nanoparticles to the electric conduction of EDL-MF. In a first experiment, the dispersion has been flocculated and the AC conductivity of the supernatant was compared to that of the original colloid. In a second experiment, AC conductivity has been measured as a function of the sample viscosity which has been tuned by adding glycerol. Indeed, the decrease of the nanoparticles mobility would drastically reduce the nanoparticles contribution to the electrical conduction of the medium when compared to that of ions. The analysis of these results have shown no evidence towards a contribution of particles to the total AC conductivity of the medium.
34
Lamirault, Sylvie. "Comportement du cuivre dans les melanges hf-mf (m = k ou nh : :(4)) fondus utilises pour l'obtention electrolytique du fluor." Paris 6, 1987. http://www.theses.fr/1987PA066467.
Full textAbstract:
Etude thermodynamique et cinetique de la corrosion electrochimique dans les melanges hf-mf(m=k ou nh::(4)) du cuivre metal entrant, soit pur, soit sous forme d'alliage (monel) dans la construction des cellules industrielles d'electrolyse. Mise en evidence de la formation d'une couche de fluorure de cuivre passivante. Evaluation de l'epaisseur limite de la couche. Etablissement de l'influence de la densite de courant sur le caractere passivant de la couche formee. Proposition d'un mecanisme de corrosion du cuivre
35
Riquelme, Breazeal Maria Virginia. "Effect of wastewater colloids on membrane removal of microconstituent antibiotic resistance genes." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/34564.
Full textAbstract:
Anthropogenically generated antibiotic resistance genes (ARGs) are considered emerging contaminants, as they are associated with a critical human health challenge, are persist independent of a bacterial host, are subject to transfer between bacteria, and are present at amplified levels in human-impacted environments. Given the gravity of the problem, there is growing interest in advancing water treatment processes capable of limiting ARG dissemination. This study examined the potential for membrane treatment of microconstituent ARGs, and the effect of wastewater colloids on their removal. Native and spiked extracellular vanA (vancomycin resistance) and blaTEM (β-lactam resistance) ARGs were tracked by quantitative polymerase chain reaction through a cascade of membrane filtration steps. To gain insight into potential associations occurring between ARGs and colloidal material, the wastewater colloids were characterized by scanning electron microscopy, as well as in their protein, polysaccharide, and total organic carbon content. The results suggest that extracellular DNA (eDNA) containing ARGs interacts with wastewater colloids, and can both be protected against degradation and be removed more efficiently in the presence of wastewater colloidal material. Thus, ARG removal may be achievable in sustainable water reuse scenarios using lower cost membranes than would have been selected based on molecular size alone. As membranes are likely to play a vital role in water sustainability, the results of this study enable consideration of ARG removal as part of a comprehensive strategy to manage emerging contaminants and to minimize overall public health risks.Master of Science
36
MELO, Erik Jonne Vieira de. "Biodiversidade bacteriana em água do mar: isolamento, caracterização e aplicação no tratamento de águas contaminadas pelo óleo combustível marítimo MF-380." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/25280.
Full textAbstract:
Submitted by Pedro Barros (pedro.silvabarros@ufpe.br) on 2018-07-26T19:47:18Z
No. of bitstreams: 2
license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5)
TESE Erik Jonne Vieira de Melo.pdf: 2722294 bytes, checksum: a93c26ee02438770545d5100f0a6f665 (MD5)Approved for entry into archive by Alice Araujo (alice.caraujo@ufpe.br) on 2018-07-30T20:23:10Z (GMT) No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) TESE Erik Jonne Vieira de Melo.pdf: 2722294 bytes, checksum: a93c26ee02438770545d5100f0a6f665 (MD5)
Made available in DSpace on 2018-07-30T20:23:10Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) TESE Erik Jonne Vieira de Melo.pdf: 2722294 bytes, checksum: a93c26ee02438770545d5100f0a6f665 (MD5) Previous issue date: 2015-02-26
O combustível marinho ou “Marine Fuel-(MF)”, ou Bunker, conhecido também como Liquido de Fase Não Aquosa (LFNA), é obtido por destilação fracionada do petróleo bruto, contituído principalmente por hidrocarbonetos de cadeias longas (alcanos, cicloalcanos e aromáticos), possibilitando diferentes categorias químicas. O óleo MF-380 tem como propriedades elevada emulsificação, baixa evaporação e intemperização lenta, permanecendo assim por longos períodos nos sedimentos, sendo um xenobiótico de difícil degradação. Neste sentido, estudos iniciais foram realizados com a água do mar do Porto de Suape, PE, Brasil, avaliando os aspectos biológicos, particularmente a biota bacteriana local. A coleta da água do mar foi realizada em três pontos, sendo as bactérias isoladas em membrana filtrante (0,22 µm), utilizando meios de culturas seletivos, sendo isoladas um total de 602 bactérias, não sendo observado diferenças no número de bactérias isoladas para os diferentes pontos de amostragem. Observou-se ainda que, o gênero mais frequente foi Bacillus (98%), seguido de Serratia (2%). As bactérias isoladas foram avaliadas quanto ao potencial oxidativo, frente ao combustível MF-380 (cedido pela TRANSPETRO). Os ensaios de degradação foram realizados em Erlenmeyers (500 mL), no meio Bushnell Haas-BH, na presença de 1% a 5% do MF-380 como fonte de carbono, incubados em condições estáticas, temperatura de 30±1ºC, por 10 dias. Excelentes resultados foram obtidos com 24h, onde 90 bactérias (15,2%) demonstraram habilidade oxidativa, e a partir dessas, observou-se que sete bactérias demonstraram atividade lipolítica (4,5 U/L a 77,2 U/L). A bactéria selecionada P11-A, com (77,2% de atividade lipolítica), demonstrou degradar 100% de Dodecano e 93,9% do Pentadecano, respectivamente, para a concentração de 3% do MF-380. Na concentração mais elevada do MF-380 (5%) observou-se uma maior degradação para hidrocarbonetos com cadeias menores pela mesma bactéria, como para Eicosano (91,6%) e Docosano (85,7%). A partir desses resultados foi realizado consorcio entre as sete bactérias selecionadas pela atividade lipolítica, empregando um planejamento Plackett & Burman, onde a variável dependente demonstrou que a bactéria P11-A (Bacillus sp.) apresentou maior potencial biotecnológico para degradação do óleo MF-380. Portanto, os estudos realizados sugerem que o Bacillus sp. (P11-A) pode ser aplicado nos processos de biorremediação pelo óleo combustível MF-380, possibilitando o interesse pelas indústrias petrolíferas.
The marine fuel or "Marine Fuel- (MF)" or Bunker, also known as non-aqueous phase liquids (LFNA) is obtained by fractional distillation of crude oil, composed primarily of long chain hydrocarbons (alkanes, cycloalkanes and aromatics ), enabling different chemical classes. The MF-380 oil has properties as high emulsification, low evaporation and slow weathering, remaining for long periods in sediments, with a xenobiotic difficult degradation. Initial studies were performed with seawater the Port of Suape, PE , Brazil, evaluating the biological, particularly bacterial biota site. The collection of sea water was performed at three points, and the bacteria isolated in membrane filter (0.22 microns) using means of selective cultures, and isolated a total of 602 bacteria, not observable differences in the number of bacteria to isolated the different sampling points. It was also observed that the most common genus Bacillus was (98%), followed by Serratia (2%). Bacterial isolates were evaluated for oxidative potential, compared to the MF-380 fuel (donated by TRANSPETRO). The degradation tests were performed in Erlenmeyer flasks (500 ml), the middle Bushnell-Haas BH, in the presence of 1% to 5% of MF-380 as the carbon source, incubated in static conditions, temperature 30 ± 1 ° C for 10 days. Excellent results were obtained with 24, 90 where bacteria (15.2%) showed oxidative ability, and from these, we found that 7 bacteria showed lipase activity (4,5U / L to 77,2U / L). The bacterium selected P11-A, (77.2% of lipase activity) showed 100% Dodecane degrade and 93.9% of pentadecane, respectively, to a concentration of 3% MF-380. At the higher concentration of MP-380 (5%) observed increased degradation to smaller hydrocarbon chains with the same bacteria, such as for eicosane (91.6%) and docosane (85.7%). From these results was carried out between 7 bacteria consortium selected by lipase activity, employing a Plackett & Burman planning, where the dependent variable showed that the P11-A bacterium (Bacillus sp.) showed higher biotechnological potential for MF-380 oil degradation. Therefore, studies have suggested that Bacillus sp. (P11-A) can be applied in bioremediation processes for fuel oil MF-380, allowing interest in the oil industry.
37
Campo, Ceballos Diego Andrés. "Análise do comportamento elástico de vigas adaptativas com ligas de Ni-Ti em temperaturas inferiores a Mf e superiores a Af." reponame:Repositório Institucional da UnB, 2012. http://repositorio.unb.br/handle/10482/11403.
Full textAbstract:
Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Mecânica, 2012.Submitted by Alaíde Gonçalves dos Santos (alaide@unb.br) on 2012-09-26T14:00:03Z No. of bitstreams: 1 2012_DiegoAndresCampoCeballos.pdf: 4401374 bytes, checksum: c4b924aaefd628ddfb8238fea176fef6 (MD5)
Approved for entry into archive by Guimaraes Jacqueline(jacqueline.guimaraes@bce.unb.br) on 2012-10-11T14:55:28Z (GMT) No. of bitstreams: 1 2012_DiegoAndresCampoCeballos.pdf: 4401374 bytes, checksum: c4b924aaefd628ddfb8238fea176fef6 (MD5)
Made available in DSpace on 2012-10-11T14:55:28Z (GMT). No. of bitstreams: 1 2012_DiegoAndresCampoCeballos.pdf: 4401374 bytes, checksum: c4b924aaefd628ddfb8238fea176fef6 (MD5)
Pesquisadores alemães desenvolveram o polipropüeno copolímero random PP. na busca de um sistema de condução de água capaz de suportar altas pressões e altas temperaturas. Este material liberou a produção de tubos e conexões resistentes à água quente, mas. por ser um material polimérico. a rigidez destas tubulações decresce com o aumento da temperatura. Este trabalho apresenta a pesquisa do comportamento mecânico ã flexão de vigas compósitas híbridas constituídas de um tubo cilíndrico de polipropüeno (PP) e uma barra circular sólida de liga de Ní-Ti. incorporada na superfície externa do tubo. fixada com uma camada bobinada de nylon impregnada com resina epóxi. Os tubos de PP podem operar em temperaturas de até 80°C. aquecendo as ligas Ní-Tí até temperaturas acima de Aí. permitindo observar a contribuição do fio no aumento da rigidez das vigas compósitas fabricadas. Inicialmente, foi caracterizada a liga de Ni-Ti apresentando temperaturas de transformação de fase de M5= 46.24°C. Mf = 31,72 °C, As= 37.67°C e Af = 60.17°C, obtidas do ensaio de calorimetria diferencial de varredura (DSC), composição química média de 50.05% em peso de Ni a partir da espectroscopia de energia dispersiva (EDS) e presença da fase monoclinica à temperatura ambiente, identificada pela difração de raios X (DRX). Posteriormente, tubos de PP de 500 mm de comprimento foram usados para fabricar vigas compósitas híbridas incorporando fios de aço e camada nylon epóxi para aperfeiçoar o método de fabricação e testar o dispositivo de flexão em três pontos. Finalmente, vigas compósitas com fio de Ní-Ti e camada de nylon/epóxi. foram fabricadas e logo testadas em flexão de três pontos. Os resultados demonstraram que houve um aumento no valor do módulo efetivo em flexão das vigas ExF de 13% a 32% quando o fio de Ní-Ti. alinhado no plano vertical de aplicação da carga do ensaio de flexão. aumentou sua rigidez pela transformação de fase martensita para austenita induzida pela mudança da temperatura de 21°C a 56°C. _______________________________________________________________________________________ ABSTRACT
German researchers have been developed a polypropylene random copolymer PP.in the search for a water transportation system capable of withstand high pressures and temperatures. This material allowed the production of pipes and connections resistant to hot water, however, stiffness decreases with increasing temperature for the polymeric properties. This work presents the mechanical behavior investigation of hybrid composites beams based Ni-Ti alloy. The beams consist of a medium density polypropylene pipe (PP) with a bar of Ni-Ti alloy incorporated in the surface and manual winding with a coated layer of nylon epoxy. PP pipes can work over SO °C heating Ni-Ti alloy to above Af temperature, which would show Ni-Ti contribution to increasing the stiffness of the hybrid composite beams. First. Ni-Ti alloy was characterized with differential scanning calorirnetry (DSC), found the transformation temperatures at Ms = 46.24 °C. Mf = 31.72 °C, A, = 37,67 °C and Af = 60.17 °C. Energy dispersive spectroscopy (EDS) results indicated chemical composition of NiTi alloy of 50.05 wt% of Ni. X-ray diffraction (XRD) showed the monoclinic phase at room temperature. Subsequently. PP pipes of 500 mm in length were used to produce hybrid composite beams incorporating a steel bar coated with nyloa epoxy layer in order to improve the manual winding method and test the three point bending device. Finally, hybrid composite beams with Ni-Ti bar and nylon epoxy layer were fabricated and then tested in three point bending. Results showed an increase on flexural elastic modulus of the beams ExF of 18% to 32% because stiffness increase of Ni- Ti alloy, aligned in the vertical plane of load application in bending test, due thermal transformation from martensite to austenite phase induced by changes of temperature from 21°Cto56°C. _______________________________________________________________________________________ RESÚMEN
Investigadores alemanes desarrollaron el polipropileno copoliniero ramdom PP en la búsqueda de un sistema de conducción de agua capaz de soportar altas temperafuras e presiones. Este material posibilitó la producción de tubos e conexiones resistentes al agua caliente, sin embargo, por ser un material polimérico, su rigidez decrece con el aumento de Ia temperatura. Este trabajo presenta Ia investigacióu del comportamiento mecânico en flexión de vigas cornpósitas hibridas constituídas de un tubo cilíndrico de polipropileno y una barra circular sólida de Ni-Tí incorporada en Ia superfície externa del tubo. y fíjada con una capa de revestimiento de nylon/epoxi. Los tubos de PP pueden trabajar en temperaturas superiores a 80 °C. logrando llevar al material de NiTi a temperaturas mayores que Af, Io que permitiria observar su contribución al aumento de Ia rigidez de Ias vigas compósitas fabricadas. Inicialmente, Ia liga de Ni-Ti fue caracterizada presentando temperaturas de transformation de fase de Ms= 46,24°C Mf= 31,72 °C As= 37,67°C e Af = 60,17°C, obtenidas de Ia calorimetria diferencial de barrido (DSC), composición química media de 50,05% en peso de Ni a partir de Ia espectroscopia de energia dispersiva (EDS) y presencia de fase monoclínica a temperatura ambiente, identificada mediante difracción de rayos X (DRX). Posteriormente, fueron usados tubos de PP de 500 mm de largo, para fabricar vigas compósitas hibridas con barras de acero e capa de revestimiento de nylo/epoxi en Ia superfície, con el fin de perfeccionar el método de fabricación y probar el dispositivo de flexión eu tres puntos. Finalmente, fueron fabricadas Ias vigas compósitas híbridas con barras de Ni-Ti e capa de revestimiento de nylon/epoxi para los ensayos de flexión en três puntos. Los resultados demostraron que hubo un aumento en el valor del módulo efectivo en flexión de Ias vigas compósitas ExF de 18% a 32% cuando la barra de Ni-Ti, alineada en el plano vertical de aplicación de Ia carga en el ensayo de flexión. aumenta su rigidez debido a la transformacion de fase de martensita a austenita inducida por el cambio de temperatura de 21°C a 56°C
38
Zhai, Chuanying. "Reliable RFID Communication and Positioning System for Industrial IoT." Doctoral thesis, KTH, Industriell och Medicinsk Elektronik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-195804.
Full textAbstract:
The Internet of Things (IoT) has the vision to interconnect everything of the physical world and the virtual world. Advanced automated and adaptive connectivity of objects, systems, and services is expected to be achieved under the IoT context, especially in the industrial environment. Industry 4.0 with the goal of intelligent and self-adaptable manufacturing is driven by the IoT. The Object Layer, where real-time and reliable information acquisition from the physical objects carried out, is the basic enabler in the 3-layer industrial IoT system. Such acquisition system features deterministic access, reliable communication with failure resistance mechanism, latency-aware real-time response, deployable structure/protocol, and adaptive performance on various QoS demands. This thesis proposes a reliable RFID communication system for acquisition in the industrial environment. A discrete gateway structure and a contention-free communication protocol are designed to fulfill the unique system requirements. Such gateway structure offers a flexible configuration of readers and RF technologies. It enables a full duplex communication between the objects and the gateway. The designed MF-TDMA protocol can enhance the failure resistance and emergency report mechanism thanks to the separation of control link and data link in the gateway. Specifically, an optional ARQ mechanism, an independent/uniform synchronization and control method, and a slot allocation optimization algorithm are designed besides time-division and frequency-division multiplexing. Protocol implementations for different industrial situations illustrate the system ability for supporting the demands of various QoS. Finally, a 2.4-GHz/UWB hybrid positioning platform is explored based on the introduced RFID system. Taking advantage of the UWB technology, the positioning platform can achieve positioning accuracy from meter level to centimeter level. Hybrid tag prototype and specific communication process based on the MF-TDMA protocol are designed. An SDR UWB reader network, capable of evaluating multiple algorithms, is built to realize accurate positioning with an improved algorithm proposed.QC 20161109
39
Pazderská, Lucie. "Návrh marketingového plánu pro elektronickou verzi novin s placeným obsahem." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-142167.
Full textAbstract:
The aim of this master thesis is to suggest the marketing plan for paid digital version of daily newspaper MF DNES. The thesis is divided into two parts -- theoretical and practical. The first part focuses on marketing plan from the theoretical point of view, where the plan and all its parts are summarized and defined into details. In the practical part, the plan is presented on the example of paid digital version of MF DNES. On the basis of deep market analysis, consumer analysis and executed marketing research, the marketing goals of the company are set. Based on these goals, the marketing strategy is suggested. The strategy is further explained in the action plan. Finally, the budget corresponding to these actions is proposed.
40
Foga, Irene Oksana. "Characterization of bidirectional adenosine transporters in rat brain synaptosomes and clonal DDT¦1 MF-2 smooth muscle cells using [³H]L-adenosine." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq23305.pdf.
Full text
41
Robinson, Alexander John. "Stimulation of the mitogen-activated protein kinase (MAPK) pathway in DDTâ‚MF-2 cells by adenosine Aâ‚ receptors and histamine Hâ‚ receptors." Thesis, Nottingham Trent University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252331.
Full text
42
MacPherson, Heather Ann. "Pilot Effectiveness and Transportability Trial of Multi-Family Psychoeducational Psychotherapy (MF-PEP) for Childhood Mood Disorders in a Community Behavioral Health Setting." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1282572794.
Full text
43
Peng, Hui. "The treatment of bilge water using a MF/UF hybrid membrane system: Membrane fouling, cleaning and the effect of constituents on flux decline." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6110.
Full textAbstract:
Bilge water accumulates in recesses and bilges onboard ships. Depending on the type of design and age, ships can generate large volumes of bilge water. This wastewater is a mixture of fresh water and seawater containing various contaminants. Typical contaminants may include fuels, oils, greases, detergents, solvents, rusts, paints, insulation material and a wide variety of other substances. Bilge water is a very challenging wastewater to treat due to large variations in production rates and the complex nature of the wastes in solution. Membrane based Oily Water Separators (OWS) are being increasingly used throughout the world for the treatment of oily wastewater. This work focused on two areas of study: (1) Effects of selected components found in bilge water on membrane performance, and (2) Pilot scale testing using a Microfiltration/Ultrafiltration (MF/UF) hybrid system. The studies are aimed at determining suitable membrane materials and optimum operating conditions such as trans-membrane pressure (TMP) and backflushing for permeate flux enhancement. (Abstract shortened by UMI.)
44
Sun, Hong Wei. "Etude de nouveaux matériaux non cristallins élaborés par hypertrempe dans les systèmes MF₄-Lif (M = Zr, Th, U) Sb₂S₃-Ag₂S-Agl." Bordeaux 1, 1986. http://www.theses.fr/1986BOR10642.
Full textAbstract:
DE NOUVEAUX MATERIAUX NON-CRISTALLINS SONT OBTENUS PAR HYPERTREMPE A PARTIR DE MELANGE CORRESPONDANT AUX SYSTEMES Sb₂S₃-Ag₂S-Agl ET MF₄-Lif (M = Zr, Th, U). LES PROPRIETES THERMIQUES, CHIMIQUES ET ELECTRIQUES SONT ETUDIEES. LA CORRELATION ENTRE CES PROPRIETES ET L'ETUDE INFRA-ROUGE PERMET UNE APPROCHE STRUCTURALE DE CES COMPOSES VITREUX
45
Starskaya, Margarita, and Özgüc Çagdas. "Analysis of the Online Collection Software provided by the European Commission for the European Citizens' Initiative." Department für Informationsverarbeitung und Prozessmanagement, WU Vienna University of Economics and Business, 2012. http://epub.wu.ac.at/3643/1/Binder1_(2).pdf.
Full text
46
David, Jean-Michel. "Développement d'une méthode de réduction pour la vibroacoustique MF et comparaison avec une approche SEA sur une plaque excitée par la couche limite turbulente." Lyon, INSA, 2005. http://theses.insa-lyon.fr/publication/2005ISAL0044/these.pdf.
Full textAbstract:
On présente le développement d'une méthode numérique permettant de réduire le coût d'une analyse vibroacoustique dans le domaine des Moyennes Fréquences (MF). Cette méthode est appliquée à l'excitation de couche limite turbulente sur une plaque plane rectangulaire élastique, testée en soufflerie et couplée à une cavité remplie d'air. La méthode de réduction porte sur les systèmes dynamiques modélisés par éléments finis et excités par des processus stationnaires à valeurs vectorielles de dimension finie ou des champs stochastiques continus spatialement, de dimension infinie, stationnaires en temps, comme c'est le cas de l'excitation de couche limite turbulente. La méthode est associée à une méthode d'analyse moyenne fréquence développée à l'ONERA, qui s'appelle la méthode MF par sous-bandes à deux échelles de temps et qui est parfaitement adaptée pour traiter les structures complexes dans le domaine MF. La méthode de réduction permet de diminuer la taille de la matrice spectrale du processus d'excitation discrétisé dans chaque sous-bande, grâce à la construction dans la bande étroite d'un opérateur réel symétrique à valeurs propres dominantes. L'approche numérique proposée, associant une méthode de résolution MF et une méthode de réduction, est validée sur des comparaisons avec une approche SEA et avec des résultats de mesures vibroacoustiques réalisées sur une plaque soumise à l'excitation de la couche limite turbulente, établie en soufflerie. Cette approche a été appliquée aussi dans le cadre de la prédiction MF du bruit interne dans une cabine d'hélicoptère pour une excitation provenant des différentes raies d'engrênement de la boîte de vitessesA numerical method which reduces the cost of a vibroacoutic analysis within Medium-Frequency (MF) domain is presented. This method is applied to the excitation by turbulent boundary layer on a rectangular planar elastic plate, tested in windtunnel and coupled to a cavity containing air. This method of reduction is applied to dynamical systems which are modeled by Finite Element method and excited by vector-valued stationary random processes of finite dimension or by random fields, spatially continous and stationary in time, of infinite dimension; as TBL excitation. The method is associated with a method of MF analysis, developed at ONERA, which is called MF subband method using two time scales and which is perfectly adapted to MF range for complex structures. The method of reduction allows to reduce the size of spectral matrix of discretized excitation process by constructing a real symmetric operator which has dominant eigenvalues within narrow subband. The numerical approach proposed, which associates a method of MF resolution to a method of reduction, is validated by comparisons with SEA method and on vibroacoustic measurements for a plate subjected to TBL excitation generated in a windtunnel. This approach was also applied to MF internal noise prediction within an helicopter cabin for an excitation coming from the main emergent frequencies of the gearbox
47
David, Jean-Michel Guyader Jean-Louis. "Développement d'une méthode de réduction pour la vibroacoustique MF et comparaison avec une approche SEA sur une plaque excitée par la couche limite turbulente." Villeurbanne : Doc'INSA, 2005. http://docinsa.insa-lyon.fr/these/pont.php?id=david.
Full text
48
Štveráková, Iveta. "Vliv změny vlastnictví médií na obsah vybraných deníků: případ akvizice mediální skupiny MAFRA." Master's thesis, Vysoká škola ekonomická v Praze, 2013. http://www.nusl.cz/ntk/nusl-193693.
Full textAbstract:
There seems to be growing amount of doubts about the independance of Czech media and its position in the public space since the mid 2013, when Andrej Babiš - the second wealthiest Czech entrepreneur and since 2014 also the minister of finance -- has bought MAFRA media house, which issues among others two Czech daily papers Mladá fronta DNES and Lidové noviny. Aim of this thesis is to find out, how the change in the ownership of the MAFRA media house affected the content of the two daily papers. Such effects are analysed in articles published in Mladá fronta DNES and Lidové noviny, firstly in general in the foreign policy topics, secondly in representation of the name of Andrej Babiš and thirdly in representation of the distinct subsidiaries of the Agrofert group. Data collection is divided into two separate periods -- before and after the acquisition of MAFRA media house by Andrej Babiš. Quantitative content analysis has been chosen as the method of research.
49
Amaral, Pauline Aparecida Pera do. "Avaliação da utilização de carvão ativado em pó superfino (S-CAP) associado a membrana de microfiltração (MF) na remoção de atrazina de água de abastecimento." reponame:Repositório Institucional da UFSC, 2016. https://repositorio.ufsc.br/xmlui/handle/123456789/175856.
Full textAbstract:
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Ambiental, Florianópolis, 2016.Made available in DSpace on 2017-05-23T04:16:39Z (GMT). No. of bitstreams: 1 345552.pdf: 4305089 bytes, checksum: b0f1f044f011bef9ab8fdd4234e6a2b6 (MD5) Previous issue date: 2016
A presença de compostos orgânicos pertencentes ao grupo dos poluentes emergentes, tal como o herbicida Atrazina, em mananciais, é preocupante pelo seu potencial nocivo a saúde humana. Consequentemente, há um grande interesse no desenvolvimento de tecnologias capazes de remover, de forma eficiente, estes compostos em estações de tratamento de água. Neste contexto, esta pesquisa teve por objetivo avaliar um sistema híbrido adsorção/filtração na remoção de Atrazina de água de abastecimento. O material adsorvente testado foi o carvão ativado em pó superfino (S-CAP), obtido a partir da moagem do carvão ativado em pó (CAP), produzido a partir de diferentes materiais precursores, sendo estes, o carvão betuminoso (BC), a madeira (WD) e a casca de coco (CS). No sistema híbrido foram utilizadas membranas de microfiltração de polivinilideno, com tamanho de poro de 0,1 µm. Para a água de estudo foi utilizada água sintética acrescida ou não de matéria orgânica natural (MON) proveniente do Rio Suwannee (RSMON) ou cálcio; também foram realizados ensaios com água natural proveniente do Rio Edisto (REMON). A metodologia foi dividida em três etapas distintas, sendo estas a caracterização do material adsorvente, os estudos cinéticos e os ensaios de adsorção/filtração. Na caracterização do material adsorvente, foi observado que características como tamanho de partícula, teor de oxigênio, pHpzc e área superficial variaram com o tempo de moagem e apresentaram correlação entre si. Os estudos cinéticos apontaram cinéticas de adsorção mais rápidas da atrazina para os BC S-CAPs, quando comparados com o BC CAP, principalmente na presença da RSMON. Os estudos de adsorção/filtração foram avaliados em termos de eficiência de remoção e fluxo de permeado. Todos os S-CAPs testados promoveram uma melhor remoção de atrazina quando comparado com seu respectivo CAP; entretanto, nenhum dos carvões testados se apresentaram eficientes na remoção da MON. Para todos os carvões testados, o fluxo do permeado variou de acordo com o tamanho de partícula dos S-CAPs, principalmente para os tempos de moagem mais longos (menores tamanhos de partículas). A MON foi a maior responsável pelo fouling da membrana, e não a presença das partículas de S-CAPs, conforme esperado, e a adição de cálcio auxiliou na obtenção de fluxos de permeado mais altos para os BC S-CAPs. No geral, observou-se que S-CAPs produzidos com tempos de moagem mais curtos, entre 10 e 30 minutos, apresentaram uma boa eficiência de remoção da atrazina e uma perda de fluxo aceitável, permitindo assim concluir que estes S-CAPs são os mais favoráveis para serem utilizados para o revestimento de membranas em sistemas híbridos.
Abstract : Trace-contaminant synthetic organic chemicals (SOCs) such as pesticides, pharmaceuticals, and personal care products found in drinking water supplies are an increasingly worrisome threat to public health. Therefore, there is a great interest of developing technologies capable of removing these compounds from water in water treatment plants. In this context, the main objective of this study was to evaluate a hybrid adsorption/membrane system aiming atrazine removal from drinking water. The adsorbent used was the superfine powdered activated carbon (S-PAC), produced by milling activated carbons (PAC) of different materials, bituminous coal (BC), wood (WD) and coconut shell (CS). Microfiltration PVDF membranes with 0,1 µm average pore size were used. The performance of the hybrid system was evaluated for a varied water matrix, with or without NOM from Suwannee River (SRNOM) and calcium; and natural water from Edisto water was also used. The methodology was divided in three main steps, adsorbent characterization, kinetics studies and adsorption/membrane experiments. The first step showed that the adsorbent characteristics, such as particle size, oxygen content, pHpzc and surface area varied with the milling time and showed statistical correlation with each other. The second step showed the BC S-PACs faster kinetics, compared with the parent PAC, for atrazine, especially with SRNMO containing water. The adsorption/membrane system was evaluated in terms of removal efficiency and permeate flux. For every condition studied and for each carbon tested, the atrazine removal by S-PACs was superior to the respective parent PACs. NOM adsorption was not found to be significantly higher on S-PAC than PAC, and the general removals were low. Oxygen content and specific external surface area (both of which increased with longer milling times) were the most significant predictors of atrazine removal. The permeate flux varied with the S-PAC particle size, especially for the longer milling times (smaller particle sizes). In most experiments, NOM caused much greater fouling than S-PAC. In the presence of NOM, calcium resulted in improved flux of the BC S-PACs by aiding in the capture of NOM within the carbon layer. In this study carbons milled for the relatively short time (relatively low energy) of 10-30 minutes were the most favorable to be used in hybrid systems.
50
Pohl, Antje Heide. "Lipid transport by ABC proteins." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2002. http://dx.doi.org/10.18452/14784.
Full textAbstract:
In eukaryotischen Zellen sind die Lipidspezies häufig asymmetrisch zwischen den Hälften der Plasmamembran verteilt. Insbesondere Phosphatidylserin (PS) weist oft eine ausgeprägte transversale Asymmetrie auf, da es fast ausschliesslich auf die innere Hälfte der Plasmamembran beschränkt ist. In den letzten Jahren wurden mehrere Proteine diskutiert, die Lipide zwischen den Membranhälften transportieren und möglicherweise die transversale Lipidasymmetrie sowie damit verbundene Zelleigenschaften beeinflussen. Im Mittelpunkt der vorliegenden Promotion steht der Auswärtstransport fluoreszierender (C6-NBD-) Lipid-Analoga und endogener Lipide durch das Multidrug Resistance 1 P-Glycoprotein (MDR1 Pgp), das der ATP Binding Cassette (ABC) Transporter Superfamilie angehört. Interessanter Weise wird für MDR1 Pgp eine ungewöhnlich breite Substratspezifität angenommen. Das anionische Lipid PS war hier von besonderem Interesse, obgleich es in vorhergehenden Arbeiten nicht als MDR1 Pgp Substrat betrachtet wurde. Der Auswärtstransport von Phosphatidylcholin-, Phosphatidylethanolamin-, Glucosylceramid- und Sphingomyelin-Analoga durch MDR1 Pgp konnte in einer humanen Magenkarzinomlinie (EPG85-257), die MDR1 überexprimiert, mittels Fluoreszenzspektroskopie bestätigt werden. Zudem legt die verringerte Akkumulation von Diacylglycerol- und Ceramid-Analoga den Transport dieser Lipidspezies durch MDR1 Pgp nahe. Im Anschluß an die intrazelluläre Markierung mit C6-NBD-PS mittels eines neuen Verfahrens konnte der signifikant erhöhte Auswärtstransport dieses Analogons in MDR1 überexprimierenden Zellen durch Verwendung spezifischer Inhibitoren MDR1 Pgp zugeschrieben werden. In flusscytometrischen Versuchen war die Exponierung von endogenem PS auf der äusseren Membranhälfte von MDR1 überexprimierenden Zellen signifikant höher als in Kontrollzellen. Verringerung der PS-Exponierung durch einen Inhibitor von MDR1 Pgp deutet auf den Transport von endogenem PS durch MDR1 Pgp hin. Zusätzlich wurde hier der Transport von C6-NBD-PS in vier weiteren Zellinien mit verschiedener Spezies- und Gewebezugehörigkeit charakterisiert, die unterschiedliche Mengen an MDR1 Pgp synthetisieren. Wie Experimente in einer BCRP überexprimierenden EPG85-257-Sublinie nahelegen, ist ausser MDR1 Pgp möglicherweise ebenfalls der ABC Halb-Transporter Breast Cancer Resistance Protein (BCRP) am Transport von C6-NBD-PS und an der verstärkten Exponierung von endogenem PS beteiligt.In eukaryotic cells, the lipid species are frequently distributed asymmetrically between the plasma membrane leaflets. Phosphatidylserine (PS), in particular, often exhibits a distinct transverse asymmetry, being restricted almost exclusively to the inner leaflet. In the past years, several proteins were suggested to transport lipids between the leaflets of a membrane, and to potentially influence transverse lipid asymmetry and related cell properties. This thesis focuses on outward transport of fluorescent (C6-NBD-) lipid analogs and endogenous lipids by the Multidrug Resistance 1 P-Glycoprotein (MDR1 Pgp), a member of the ATP binding cassette (ABC) transporter superfamily. Interestingly, MDR1 Pgp has been suggested to exhibit an unusually broad substrate specificity. Here, the anionic PS was of particular concern, although previously reported not to be an MDR1 Pgp substrate. In a human gastric carcinoma cell line (EPG85-257) overexpressing MDR1, outward transport of phosphatidylcholine, phosphatidylethanolamine, glucosylceramide and sphingomyelin analogs via MDR1 Pgp was confirmed using fluorescence spectroscopy. In addition, decreased accumulation of analogs of diacylglycerol and ceramide suggest MDR1 Pgp mediated transport of these lipid species. Upon intracellular labelling with C6-NBD-PS using a novel approach, significantly increased outward transport of this analog in MDR1 overexpressing cells could be attributed to MDR1 Pgp by employing specific inhibitors. In a flow cytometry setup, the exposure of endogenous PS on the outer plasma membrane leaflet was significantly elevated in MDR1 overexpressing cells compared to controls. Reduction of PS exposure by an MDR1 Pgp inhibitor suggests transport of endogenous PS by MDR1 Pgp. Transport of C6-NBD-PS was furthermore characterized here in four additional cell lines of different species and tissue origin with varying synthesis levels of MDR1 Pgp. Besides MDR1 Pgp, the ABC half-size transporter Breast Cancer Resistance Protein (BCRP) is possibly also involved in transport of C6-NBD-PS and in increased exposure of endogenous PS, as found in a BCRP overexpressing EPG85-257 subline.