Dissertations / Theses on the topic 'Relative humidity'
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Pretlove, Stephen Edward Charles. "Predicting relative humidity in UK dwellings." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555004.
Full textBellmann, C., A. Steinke, T. Frank, and G. Gerlach. "Humidity micro switch based on humidity-sensitive polymers." SPIE, 2015. https://tud.qucosa.de/id/qucosa%3A35030.
Full textMcCarthy, Mark Paul. "Observed variability of tropical tropospheric relative humidity." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419846.
Full textTyrell, James W. G. "The influence of relative humidity on interparticle force." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/844097/.
Full textNewnum, Justin Dale. "The effects of relative humidity on respirator performance." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/861.
Full textŠvarc, Vojtěch. "Stínící efekt oxidové izolační vrstvy na povrchový potenciál měřený pomocí Kelvinovy sondové mikroskopie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231956.
Full textZhang, Qing. "Creep properties of cementitious materials : effect of water and microstructure : An approach by microindentation." Phd thesis, Université Paris-Est, 2014. http://pastel.archives-ouvertes.fr/pastel-00996571.
Full textGuo, William X. "Influence of relative humidity on the stress relaxation of sucrose compacts." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ51526.pdf.
Full textGurnagul, N. (Norayr). "Some effects of relative humidity on the porous structure of paper." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74013.
Full textMooney, J. P. "The effect of relative humidity on mycotoxin production by Penicillium viridicum." Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382428.
Full textSmith, Megan Schwenker. "An Investigation into CaDNA Conformation as a Function of Relative Humidity." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279122399.
Full textAung, Tin. "Effect of relative humidity on peanut (Arachis hypogaea L.) seed deterioration /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487687959966447.
Full textTalbot, Collin. "Effects of relative humidity on the fluorescence of uranine (disodium fluorescein)." Oklahoma City : [s.n.], 2009.
Find full textMooiweer, Wiesje. "The dependence of aerosol scattering on relative humidity and particulate composition." Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1798481061&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Full textJohari, Houri. "Development of MEMS Sensors for Measurements of Pressure, Relative Humidity, and Temperature." Digital WPI, 2003. https://digitalcommons.wpi.edu/etd-theses/815.
Full textCosta, Junior Juvenil Severino da. "Sensor de umidade microeletrônico fabricado em substrato de alumina e baseado na detecção do ponto de orvalho." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259033.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: Sensores de umidade relativa do ar estão sendo cada vez mais utilizados em sistemas de controle e aquisição de dados. Estes sensores são facilmente encontrados em estufas, automóveis, refrigeradores, equipamentos médicos, eletrodomésticos, instrumentos de precisão e outros. Mais recentemente, com o crescimento do mercado agrícola no Brasil, a demanda por sensores de umidade vem crescendo substancialmente. Este trabalho e dedicado ao estudo de um sistema sensor de umidade por detecção de ponto de orvalho utilizando uma ponte de impedância. A ponte de impedância foi microfabricada diretamente sobre um substrato de alumina que compõe uma pastilha Peltier. Um termistor também micro fabricado no mesmo substrato fornece o sinal necessário para a detecção do ponto de orvalho. A face fria da pastilha Peltier e resfriada ate alcançar a temperatura do ponto de orvalho do ar ao seu redor. Este resfriamento resulta na saturação do vapor de d'água presente no ar, fazendo com que gotículas de água condensem sobre o substrato de alumina. A condensação de água sobre os eletrodos da ponte de impedância causa um desbalanceamento que gera um sinal de controle para a pastilha Peltier. As temperaturas no limiar de condensação e ambiente são utilizadas no calculo da umidade relativa. Este sensor de umidade foi projetado para que alguns requisitos com relação a resistência contra contaminantes e baixa histerese fossem alcançados
Abstract: Sensors for relative humidity are being increasingly used in control systems and data acquisition. These sensors are easily found in greenhouses, cars, weather equipment, medical equipment, appliances, etc.. More recently, with the growth of the agricultural market in Brazil, the demand for humidity sensors has been growing substantially. This work is dedicated to the study of a humidity sensor for dew point detection using an impedance bridge. The impedance bridge was microfabricated directly on an alumina substrate that comprises a Peltier device. A thermistor also microfabricated on the same substrate control the temperature of the Peltier device to the threshold where the dew point produces the saturation of water vapor in the air. The cold face of the Peltier device is cooled until it reaches the dew point temperature. This cooling results in saturation of water vapor in the air, around the side of the Peltier device causing water droplets to condense on the alumina substrate. Water condensation on the electrodes of the impedance bridge causes an imbalance that generates a control signal to the Peltier device. The temperatures measured at the threshold of condensation along with ambient temperature are used to calculate the relative humidity. This sensor was designed to fulfill some requirements related to resistence to contaminants and low hysteresis
Mestrado
Eletrônica, Microeletrônica e Optoeletrônica
Mestre em Engenharia Elétrica
Gouveia, Rubia Figueredo. "Padrões eletrostaticos em uma superficie de silica : um modelo para o acumulo de cargas eletricas em isolantes." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250289.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
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Resumo: Atualmente muitas tecnologias importantes são baseadas nos princípios eletrostáticos, como por exemplo, a pintura eletrostática, a reciclagem de termoplásticos e a eletrofotografia. No entanto, mesmo considerando todo o desenvolvimento da eletrostática, ainda existem muitas questões importantes não respondidas, quando se considera a eletrização de materiais isolantes. Na maioria dos casos não se conhece quais são as espécies portadoras de cargas, nem como elas podem ser detectadas e identificadas. Trabalhos anteriores deste laboratório mostraram que os portadores de cargas em látexes são íons simples (K, RSO4, etc). Neste trabalho foram estudados os padrões eletrostáticos criados em uma superfície de sílica, recoberta por um conjunto de eletrodos interdigitados de ouro. As amostras foram preparadas utilizando técnicas microlitográficas e sua superfície foi investigada usando as microscopias de força atômica (AFM) e de varredura de potencial elétrico (SEPM). Foram obtidos padrões eletrostáticos reprodutíveis; a aplicação de uma diferença de potencial elétrico entre os eletrodos produz padrões de potenciais elétricos que desaparecem rapidamente quando os eletrodos são curto-circuitados e aterrados. O tempo de relaxação desses padrões foi de aproximadamente 10 minutos sob umidade de 70% e eles são fortemente influenciados pela umidade relativa da atmosfera, apresentando um tempo de decaimento superior a 1 hora, quando a superfície é exposta a uma umidade relativa de 10%. Os resultados são interpretados usando um modelo simples baseado na quimisorção de espécies presentes na atmosfera acompanhada de reações eletródicas, podendo ser aplicado a outros isolantes.
Abstract: Many current important technologies are based on electrostatic principles, as for instance electrostatic painting, polymer recycling and photocopying. However, even considering its long history, there are still many open questions in the study of electric phenomena in insulators. For instance, how can charge carriers in insulators be detected, identified and quantified? In this laboratory the examination of latexes showed that the charge carriers are K e RSO4 ions. This work describes reproducible electric potential patterns created on silica surfaces, covered with sets of interdigitated parallel gold electrodes by using microlithography techniques. The patterns are detected by concurrent atomic force microscopy (AFM) and scanning electric potential microscopy (SEPM). The images were acquired while electrodes were biased and also after they were all short-circuited and grounded, producing reproducible electrostatic patterns. Characteristic times for pattern formation and relaxation are in the order of 10 minutes at 70% relative humidity and they are strongly influenced by the relative humidity of the atmosphere, showing a relaxation time in the order of 1 hour, when the surface is under 10% RH. The results are interpreted using a model based on the chemisorption of atmospheric water and electrochemical activity at the silica surface. The sum up, this work describes a new approach to the study of the electrification of insulator surfaces that produces reproducible results and can be applied to many other cases.
Mestrado
Físico-Química
Mestre em Química
Poderoso, Fabiana Maria Gonçalves de Lima. "Impacto do ambiente do incubatório na produção de pintos de corte." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256837.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agrícola
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Resumo: No Brasil, a avicultura é uma atividade relativamente nova, apesar de ter seu início na década de 30, como atividade fornecedora de subproduto, o esterco para os cafezais, se tornando uma atividade econômica produtora de proteína de alto valor biológico, somente a partir da década de 60. Hoje ocupa um lugar privilegiado na economia mundial devido ao trabalho de muitos profissionais ligados à atividade, sendo os principais pontos que ocorreram grandes melhorias: avanço tecnológico nas áreas de produção, nutrição e sanidade, permitindo uma melhora significativa nos índices zootécnicos. O incubatório é o local onde se obtêm o produto final, ou seja, do pintainho de um dia, tem a responsabilidade de disponibilizar aos produtores, pintos de qualidade para maximizar o desempenho das aves a campo. O presente trabalho teve como objetivo geral avaliar a influência da temperatura e da umidade relativa do ar no ambiente do incubatório, sobre as respostas da taxa de eclosão durante o processo de incubação e nascimento. Os dados de temperatura e umidade relativa do ar foram registrados em uma das salas das incubadoras e em uma das salas de nascedouro do Incubatório São José no município de Amparo - SP e analisados com relação ao índice de eclosão dos ovos incubados que foi analisado no dia do nascimento dos pintos. Foram rastreadas 48 bandejas, tendo capacidade de 96 ovos cada bandeja, até o nascimento desses pintos, sendo estas divididas seis quadrantes na incubadora sendo oito bandejas em cada quadrante classificadas como lotes e após foram monitoradas na sala de nascedouro que foi dividida em quatro quadrantes. Os dados foram submetidos à análise estatística descritiva por lote e análise de comparação de médias, através do teste F na ANOVA e do teste não-paramétrico de Kruskal-Wallis. Os resultados obtidos foram: a temperatura do ambiente influenciou o descarte total de ovos no 14º dia de incubação (de 35.9ºC à 37.0°C) e no 21º de incubação (de 37,0 °C à 37,3 °C) e, comparados com a idade das matrizes (42 semanas e 56 semanas), identificou-se que a matriz mais velha obteve maior número de descartes nas variáveis analisadas como: ovos inférteis, mortalidade de 0 a 7 dias e ovos quebrados, a serem o volume maior do total de ovos descartados. E, somente houve influência da umidade relativa do ar aos 21 dias de incubação ( de 52,2% à 62%). Conclui-se que houve influência do ambiente térmico e da idade da matriz no descarte total de ovos no processo de incubação
Abstract: Poultry science is responsible for studying the birds. In Brazil poultry production is a relatively new activity, although had its beginning in the 30's decade as an activity that supplied waste which was used in coffee production. It became an economical activity that produces protein of high biological value just after the decade of 60. Today Brazil occupies a privileged place in the world's economy due to the work of several professionals connected to this activity. The areas were the greatest technological improvements occurred are: production, nutrition and health, allowing significant enhancement in animal production indexes. The hatchery is the place where the final product is obtained, the one day old pullet, and that has the responsibility of given the producers high quality chicks in order to maximize their performance in the field. The objective of this research is to evaluate the influence of ambient temperature and relative humidity of the air in the hatchery on the response during the process in both incubator and hatcher. Air temperature and relative humidity data will be registered in a incubator and hatcher at the Incubatório São José, county of Amparo - SP and they will be analyzed with relation to the hatcher index at the first day. Forty eight trays with 96 eggs each were screened trays until the birth of these chicks. The hatchery was divided in six quarters and eight incubator trays in each quadrant were classified as lots and they were monitored after the hatcher room, which was divided into four quadrants. The data were analyzed by descriptive statistics and analysis of batch mean comparison, using the F test in ANOVA and nonparametric Kruskal-Wallis. The obtained results were: the temperature of the environment influenced the discarding total egg on day 14 of incubation and 21 of incubation and compared with age of the array, we identified that it took the variables as: infertile eggs, mortality 0-7 days and broken eggs, to be the bulk of total eggs discarded. There was only influence of relative humidity at 21 days of incubation. It is concluded that there was influence of thermal environment and age of female breeder in total egg discarding in the process of incubation
Mestrado
Construções Rurais e Ambiencia
Mestre em Engenharia Agrícola
Smolinski, Steven P. "Marine boundary layer depth and relative humidity estimates using multispectral satellite measurements." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23069.
Full textThai, Minh Quan. "Modélisation micromécanique et simulation numérique du fluage des bétons avec prise en compte de l'endommagement et des effets thermo-hydriques." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00788439.
Full textJacquot, Bruno. "Etanchéité des matériaux pour obturations radiculaires et coronaires en odontologie : approche physico-chimique." Thesis, Montpellier 1, 2011. http://www.theses.fr/2011MON12201/document.
Full textThis thesis is divided into 4 partsThe first part is an original approach in dentistry by modeling the penetration of dyes at the interface of root filling materials. The two extreme situations were considered. When the interface is filled only with air at atmospheric pressure, the penetration is by capillary action. When the interface is filled with water, the penetration is by diffusion. The different physical equations governing these phenomena have been determined. The influence of the various parameters were quantified. The second part and third part are a review of critical literature on the influence of relative humidity and temperature of the oral environment on adhesion and sealing material for sealing coronary adhesives. A correlation was sought between laboratory studies and clinical trials.The fourth part is the development of a model to assess the penetration of liquid water and water vapor on the surface of the adhesive materials used in dentistry. Surface analysis is carried out by Raman spectroscopy and the degree of conversion of the methacrylate resins is quantified. Layer inhibition by oxygen is characterized by thickness and degree of conversion. A comparison is made between the composite filling, the composite flow and various adhesive systems enamel-dentin
Lee, Lizabeth. "Monitoring of Indoor Relative Humidity Levels in Residential Dwellings: A Sensor Network Application." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/270.
Full textWatson, David William. "Monitoring moisture movement within modified concretes." Thesis, Heriot-Watt University, 1997. http://hdl.handle.net/10399/641.
Full textFan, Mizi. "Dimensional instability of cement bonded particleboard : understanding its occurrence and reducing its magnitude." Thesis, Bangor University, 1997. https://research.bangor.ac.uk/portal/en/theses/dimensional-instability-of-cement-bonded-particleboard--understanding-its-occurrence-and-reducing-its-magnitude(ce649ec2-90ed-4914-8412-4af2e67e749f).html.
Full textTapias, Camacho Mauricio Alberto. "Particle model for crushable aggregates which includes size, time and relative humidity effects." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/404622.
Full textEsta tesis presenta un estudio del comportamiento mecánico de los agregados gruesos a partir de la modelación numérica utilizando el método de Elementos Discretos (DEM). Se ha desarrollado un novedoso modelo DEM que tiene en cuenta la rotura de las partículas, la humedad relativa, la influencia del tiempo y el efecto del tamaño de las partículas.Se propone un criterio de rotura de partículas con base en la mecánica de fracturas y la teoría de propagación subcrítica de grietas. Tres modelos teóricos para la propagación de grietas se proponen teniendo en cuenta la influencia de la humedad relativa.Después de realizar un análisis de sensibilidad de formas de las partículas, para el modelo DEM se seleccionaron macropartículas con formas piramidales que se comportan como clumps (totalmente rígidas) y pueden romper. El modelo ha sido implementado utilizando el software comercial PFC3D, mediante la incorporación de funciones programadas en lenguaje FISH.El modelo DEM propuesto trabaja principalmente con tres parámetros: la rigidez de los contactos (kn), la fricción entre las partículas (µ) y la tenacidad de Fractura del material (Kc). También tiene en cuenta la rugosidad superficial de las partículas a través del parámetro ¿o (ángulo sólido-solid angle) y la tensión de fluencia de los agregados.Con el fin de calibrar los parámetros del modelo se realizaron algunos ensayos de laboratorio. Para la estimación de µ: ensayos para determinar el ángulo de fricción básico y mineral de los agregados a partir de ensayos de corte utilizando la Mesa Inclinada y el Corte Directo. Para la determinación de kn: ensayos de Rigidez de Contactos a partir de compresión uni-direccional sobre muestras prismáticas con uno de sus extremos de forma piramidal apoyado sobre una superficie plana. Para la determinación de ¿o: estimación de la Rugosidad media (Ra) medida a partir de observaciones con el microscopio.La calibración de los parámetros del modelo DEM también se llevó a cabo a partir de un análisis retrospectivo (back analysis) de los ensayos numéricos edométricos comparados con datos experimentales ¿realizando un análisis de sensibilidad de diferentes parámetros-. Se tuvieron en cuenta la compresibilidad, la evolución de las curvas granulométricas y el cálculo de índices de rotura.Adicionalmente, con el fin de investigar sobre los mecanismos de rotura, se realizaron ensayos edométricos sobre un material frágil: cubos de azúcar. Se utilizaron dos tipos de arreglos de los cubos obteniéndose dos relaciones de vacíos iniciales muy diferentes: 0.80 y 0.20. Se determinaron dos mecanismos de rotura: Rotura local (comminution crushing) y divisiones en dos partes que se aproximaron a mitades (particle splitting). Así mismo se realizó un análisis del comportamiento en el tiempo. Estas consideraciones fueron tenidas en cuenta en el modelo DEM.También se ejecutaron ensayos triaxiales numéricos con los parámetros calibrados previamente en los ensayos edométricos y se compararon con resultados experimentales de la literatura. La predicción del comportamiento fue bastante acertada mostrando de esta forma la fiabilidad del modelo desarrollado. Las simulaciones DEM de los ensayos edométricos y triaxiales fueron consistentes y bastante ajustadas con los resultados experimentales. La influencia de la humedad relativa en el comportamiento mecánico, el efecto del tamaño de las partículas, el comportamiento dependiente del tiempo y la evolución de la curvas de distribución granulométrica fueron bien reproducidas.
Mamo, Bayou Million. "The effect of natural fencerows on local standardized windspeed, temperature and relative humidity." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0019/MQ29455.pdf.
Full textWillard, Eric Hillman Tharsing. "Temperature and relative humidity gradients of intermittent and perennial tributaries in Northern California." [Chico, Calif. : California State University, Chico], 2009. http://hdl.handle.net/10211.4/108.
Full textNiaziEsfyani, Sadegh. "The role of relative humidity and aerosol composition in airborne respiratory virus survival." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/214025/1/Sadegh_NiaziEsfyani_Thesis.pdf.
Full textWright, Jonathon S. "Influences of Tropical Deep Convection on Upper Tropospheric Humidity." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11573.
Full textGodoy, Charlotte. "Filtration d’aérosols de suie en présence de vapeur et/ou de gouttelettes d’eau." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0287.
Full textOne of the most frequently used methods to purify air contaminated by particles, in many industrial processes, is filter media. These collective equipment for protecting people and the environment are proven in terms of initial efficiency, but their behavior over time remains difficult to predict. This is all the more noticeable when these devices are confronted with a biphasic aerosol composed of solid and liquid particles. These situations can be encountered during metals machining, pesticides spreading or even during fires in confined areas such as nuclear power plants. The proposed study will aim to establish the performance of a fibrous media with respect to biphasic aerosols with nanostructured solid particles and droplets (submicron or micron-sized). If the filtration of solid aerosols or liquid aerosols is relatively well documented in the literature, no study has been interested in this problem of biphasic aerosols. For high solid / liquid ratios, the time course of the pressure drop should be close to solid aerosols filtration evolution, ie a quasi-linear increase over time. In the case of an aerosol predominantly made up of droplets, a constant pressure drop overtime, characterized by a state of equilibrium between the mass flow rate of collected droplets and the flow rate of liquid drained on the downstream face of the filter, could be considered . But what about the evolution of the pressure drop between these two extremes? The determination of the temporal evolution of the collection efficiency is also uncertain and should be regarded as a real metrological challenge
Tabor, Kimberly Lane. "Succession and Development Studies on Carrion Insects of Forensic Importance." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11188.
Full textPh. D.
Ozsan, Burcu. "Effect Of Relative Humidity Of Reactant Gases On Proton Exchange Membrane Fuel Cell Performance." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614375/index.pdf.
Full textC, and relative humidity of the entering gases changing from 20 to 100 % for air and 50 % and 100 % for hydrogen. Tests were performed in a PEM fuel cell test station. The highest performance of 275 mA/cm2 at 0.6 V and 650 mA/cm2 at 0.4 V was obtained for 50 % RH air with a constant 100 % relative humidity of hydrogen for working at atmospheric pressure and 60 oC fuel cell temperature. However, the highest performance of 230 mA/cm2 at 0.6 V for 50 % RH of air with a constant 100 % relative humidity of hydrogen and the highest performance of 530 mA/cm2 at 0.4 V for both 70 % RH and 100% RH air with a constant 100 % relative humidity of hydrogen was obtained for working at atmospheric pressure and 70 oC fuel cell temperature. Besides, the highest performance of 200 mA/cm2 at 0.6 V and 530 mA/cm2 at 0.4 V was obtained for 100 % RH air with a constant 100 % RH of hydrogen for working at atmospheric pressure and 80 oC fuel cell temperature.
Bell, Ryan D. "Impact of Relative Humidity on the Biology of Pardosa milvina Hentz, 1844 (Araneae: Lycosidae)." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243917682.
Full textQuaas, Johannes. "Evaluating the “critical relative humidity” as a measure of subgrid-scale variability of humidity in general circulation model cloud cover parameterizations using satellite data." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-177265.
Full textChovanec, Jan. "Meteorologická měření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217479.
Full textIrvine, Douglas A. "Control of temperature, relative humidity and carbon dioxide for reduced ventilation in commercial potato storages." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq23352.pdf.
Full textAltaf, Kazim. "Investigation of the effect of relative humidity on additive manufactured polymers by depth sensing indentation." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8567.
Full textVohra, Amit. "Photocatalytic disinfection of indoor air effect of relative humidity and surface roughness of photocatalytic reactor /." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013032.
Full textWeeks, Brian, and Paul Baker. "Survivability of the Subterranean Termite Heterotermes aureus When Exposed to Different Temperatures and Relative Humidity." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2006. http://hdl.handle.net/10150/216629.
Full textCardona, Allison Leanne. "The frequency of tropopause-level thick and thin cirrus clouds as observed by CALIPSO and the relationship to relative humidity and outgoing longwave radiation." Texas A&M University, 2008. http://hdl.handle.net/1969.1/85992.
Full textSantos, Helena Paula Aguiar Vicente dos. "Espectro de esporos de fungos alergisantes na atmosfera de Lisboa." Master's thesis, ISA/UTL, 2011. http://hdl.handle.net/10400.5/4103.
Full textSpectrum of allergenic fungal spores in the atmosphere of Lisbon Outdoor airborne fungal spores may cause respiratory allergic diseases in humans. The genera Alternaria and Cladosporium are referred by several authors as the most common and prevalent allergenic fungi distributed in atmosphere. Monitoring of these fungi and the knowledge on the influence of climate on their distribution and abundance are important contributions to the elaboration of calendars of occurrence. The present work aimed at analyzing the seasonal variation in the concentration of spores of both fungal species and establishing relationships between meteorological parameters and their dynamics. The samples were collected in the city of Lisbon, between February 2009 and February 2011, with a volumetric Hirst-type trap. The assessment of effects of meteorological parameters was determined through multiple linear regression and application of the AIC criteria. Results confirmed the permanence of both fungi with a distinct predominance for Cladosporium. The highest concentrations of spores occurred in the months of June and July. Temperature and relative humidity of atmosphere were found to be the parameters best correlated with the abundance of those fungal spores in the atmosphere. Continuing of studies of this kind was considered to be recommendable to improve knowledge on the occurrence of these fungal spores in atmosphere.
Larish, Whitney Anne. "Heterogeneous reaction and kinetics of acetic acid on components of mineral dust aerosol." Thesis, University of Iowa, 2014. https://ir.uiowa.edu/etd/1351.
Full textRibeyre, Quentin. "Influence de l'humidité de l'air sur la perte de charge d'un dépôt nanostructuré." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0056/document.
Full textAir quality has emerged as a major public environmental and health issue. Almost all fine particles in the air are man-made or manufactured and there are many questions regarding the impact of ultrafine (<100nm) particles on human health. Thus, in most cases, institutions use large-scale protection equipment to protect workers. These institutions often use particulate air filters placed within the flow of general ventilation. Almost all of the available data corresponds to standard ambient air conditions. Despite this, few studies focus on the interaction of water moisture on the deposit formed by these accumulated nanoparticles and the impact on the pressure drop. The first part of this study consists of the measurement of sorption isotherms of four nanostructured powders. A semi-predictive sorption model based on the theory of the multimolecular adsorption (described by the GAB equation) and on the capillary condensation (Kelvin’s law) was developed. The second part of the study experimentally describes the thickness and pressure drop variation of a porous medium formed by these nanostructured particles for different values of humidity. Through the thickness variation of the media - determined by laser trigonometry - and adsorption-condensation model, the porosity for each humidity value has been calculated. Following this, three pressure drop models available in the literature have been modified by introducing cake thickness and porosity variation according to relative humidity. This allows us to model the experimental data for all the samples. Finally, a rheological analysis of powders is proposed to quantify the cohesion changes under moisture conditions
Schladitz, Alexander. "Parametrization of relative humidity- and wavelength-dependent optical properties of mixed Saharan dust and marine aerosol." Doctoral thesis, Universitätsbibliothek Leipzig, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-70494.
Full textAerosolpartikel wechselwirken durch Streu- und Absorptionsprozesse mit der einfallenden Sonnenstrahlung und haben somit einen direkten Strahlungseffekt. Bei relativen Feuchten bis 100% können Aerosolpartikel aufquellen und somit ihre Größe ändern. Im Zuge des Aufquellens, ändern sich die optischen Eigenschaften und somit auch der direkte Strahlungseffekt der Aerosolpartikel. Speziell für Mischungen von verschiedenen Aerosolspezies ist die Änderung der optischen Eigenschaften des Aerosols durch Feuchte Einfuss noch nicht ausreichend verstanden. Gegenstand der vorliegenden Arbeit ist daher die Quantifizierung der wellenlängen- und feuchteabhängigen optischen Eigenschaften einer Mischung von Saharastaub- und marinen Aerosol. Die zur Quantifizierung notwendigen Daten wurden im Rahmen einer Feldmessung von mikrophysikalischen- und optischen Aerosol-Eigenschaften auf den Kapverdischen Inseln gesammelt. Auf Grundlage dieser Messungen wurde ein Aerosol-Modell entwickelt. Dieses Modell wurde daraufhin verwendet, um Berechnungen von optischen Aerosol-Eigenschaften bei relativen Feuchten bis 90% durchzuführen. Eine Messung der Lichtschwächung durch Aerosolpartikel unter Umgebungsbedingungen wurde verwandt, um das Modell bei Umgebungsfeuchten zu validieren. Die Wellenlängen- und Feuchteabhängigkeit der optischen Eigenschaften des Aerosols wurde parametrisiert und konnte anhand von zwei Parametergleichungen bestimmt werden. Unter Benutzung von tabellierten Werten und der Wellenlänge des einfallenden sichtbaren Sonnenlichtes, der relativen Feuchte, sowie der Staubvolumenfraktion, kann die Feuchteabhängigkeit von wichtigen Aerosol-optischen Eigenschaften für Saharastaub, marinen Aerosol und einer Mischung aus beiden Komponenten bestimmt werden. Globale Zirkulationsmodelle, die auch eine Berechnung von Strahlungseffekten durch Aerosolpartikel beinhalten, nutzen Aerosol-optische Eigenschaften als Eingabeparameter. Durch zunehmende Komplexitiät zur Beschreibung von Wechselwirkungen in der Atmosphäre, sind einfache Parametrisierungen unabdingbar. Die vorliegende Arbeit liefert daher einen wichtigen Beitrag für die Modellierung von Strahlungseffekten durch Aerosolpartikel und somit zum Verständnis des Strahlungshaushaltes der Erde
Crimm, Robert Prentiss. "Experimental apparatus for measuring moisture transfer in porous materials subject to relative humidity and temperature differences." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-01122010-020146/.
Full textMarks, Marguerite Colasurdo. "Incorporating Chemical Activity and Relative Humidity Effects in Regional Air Quality Modeling of Organic Aerosol Formation." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1511.
Full textTesta, F. "INFLUENCE OF ATMOSPHERIC TEMPERATURE AND RELATIVE HUMIDITY ON BULK MILK SOMATIC CELL COUNT IN DAIRY HERDS." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/168080.
Full textJonquille, Jenny. "Développement de couches de diffusion de piles PEMFC pour un fonctionnement à faible humidité relative." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00631359.
Full textDomenegueti, José Francisco Miras. "Sensor de umidade e vácuo baseado na reflexão interna." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-09092014-113655/.
Full textIn the present work we propose the use of a refractometric technique based on the determination of the critical angle for the development of a relative humidity sensor and, in the same application scope, a primary vacuum gauge. The proposed technique takes advantage of the phase difference acquired by the parallel and perpendicular components of a, linearly polarized, light beam undergoing internal reflection, to produce an easily detectable intensity minimum in the reflected profile corresponding to the position of the critical angle. We develop a study about the main theoretical aspects involved in the total internal reflection phenomenon, where we perform some simulations aiming to evaluate the variations of the critical angle angular position from changes on the refractive index. The basic set up used in the experiments consist of a HeNe tunable laser, a polarizer, a semi-cylindrical prism with known refractive index made of flint glass type, a analyzer, a linear CCD and a computer, where the information collected by de CCD were treated by means of a data acquisition program developed on the LabVIEWTM platform. The used program allows the point-by-point monitoring of the changes of the profile reflected from the prism base, in other words, one can monitor all the evolution dynamics of the refractive index of the analyzed sample in real time. To confirm the effectiveness of the technique, we perform measurements of changes of the refractive index of gaseous samples as function of the relative humidity and the pressure. The system has shown enough sensitivity to track changes of the order of 10-5 in units of the index of refraction.
Junior, Sergio Serafini. "O microclima de uma vereda degradada: estudo de caso no Parque Estadual Veredas do Peruaçu - MG." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/8/8135/tde-08102010-110002/.
Full textThe Cerrado, throughout the history of occupation by man, has been deployed at the expense of reduced its biodiversity. Among the various characteristics of the vegetation cerrado, in this thesis, a greater emphasis is given to paths that line the river system following its track and forming a corridor of vegetation cover trees, often used by local wildlife as source of food, shelter and reproduction, favoring local gene flow, as part of the natural maintenance of ecosystems present there trainers Cerrado. In view of the importance of environmental preservation cerrado was created State Park Trails Peruaçu which is located in the northern region of Minas Gerais, where also rural properties that are installed focus their activities on the farm and livestock. In this context, the river itself Peruaçu configures itself as the geographical boundary between this unit and Conservation farms near here that often the excess as a way of expanding their areas productive than hunting and logging production coal, jeopardizing the preservation of environments paths that exist there, also changing the microclimatic characteristics of that environment, observed in the study area, through data collection, when it was found that these modified environments by human action were air temperature (° C) higher and relative humidity (%) lower.