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Interações entre a atmosfera e a superfície terrestre: variações da temperatura e umidade na bacia B do Núcleo Cunha (IF) - SP; Interactions between atmosphere and land surface: temperature and humidity variations in Basin B of Núcleo Cunha (IF) - SP

Armani, Gustavo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 08/10/2004 PT
Relevância na Pesquisa
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Os objetivos desta pesquisa são: a) compreender como a temperatura do ar e a umidade relativa na bacia B do Núcleo Cunha (IF) estão relacionadas aos controles climáticos (altitude, declividade e orientação das vertentes, vegetação, a configuração do céu, etc); b) entender qual a importância de cada controle climático nas variações de temperatura e umidade relativa sob a ação de diferentes sistemas atmosféricos. Os controles microclimáticos produzem alterações no ritmo da temperatura e da umidade relativa de diferentes formas e graus de importância em função do sistema atmosférico atuante. Entretanto, a combinação de controles climáticos específicos pode criar ambientes que mantém o ritmo da temperatura e umidade mais estável, independente do sistema atmosférico que estiver atuando. A água no solo desempenha um papel fundamental na minimização das variações da temperatura e da umidade em ambientes específicos. A vegetação também desempenha um papel importante no controle dos valores de umidade relativa, sendo mais relevante que a declividade e a orientação da vertente. As unidades climáticas da Bacia B foram delimitadas como síntese de todas as interações entre os atributos e controles climáticos. O conceito de unidade climática como um espaço onde a interação entre os atributos e controles climáticos tem uma certa homogeneidade...

Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating

Correia, Sandra F. H.; Antunes, Paulo; Pecoraro, Édison; Lima, Patricia P.; Varum, Humberto; Carlos, Luis D.; Ferreira, Rute A. S.; Andre, Paulo S.
Fonte: Mdpi Ag Publicador: Mdpi Ag
Tipo: Artigo de Revista Científica Formato: 8847-8860
ENG
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In this work we proposed a relative humidity (RH) sensor based on a Bragg grating written in an optical fiber, associated with a coating of organo-silica hybrid material prepared by the sol-gel method. The organo-silica-based coating has a strong adhesion to the optical fiber and its expansion is reversibly affected by the change in the RH values (15.0-95.0%) of the surrounding environment, allowing an increased sensitivity (22.2 pm/%RH) and durability due to the presence of a siliceous-based inorganic component. The developed sensor was tested in a real structure health monitoring essay, in which the RH inside two concrete blocks with different porosity values was measured over 1 year. The results demonstrated the potential of the proposed optical sensor in the monitoring of civil engineering structures.

Effect of air humidity on the egg viability of predatory mites (Acari: Phytoseiidae, Stigmaeidae) common on rubber trees in Brazil

De Vis, Raf Michaël Julien; Moraes, Gilberto José de; Bellini, Marcos Roberto
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 25-32
ENG
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Rubber pest mites, Calacarus heveae and Tenuipalpus heveae, reach economic damage levels at the end of the rainy season and the beginning of the dry season in Brazil. Therefore, low humidity adaptation might be an important characteristic for predatory mites to successfully control pest organisms. This study determined the effect of the relative humidity (RH) levels of 30-100% on the hatching of larvae of Amblyseius acalyphus, Euseius citrifolius, Iphiseiodes zuluagai, Metaseiulus camelliae, Agistemus floridanus and Zetzellia malvinae at 25 ± 0.5°C. These predatory mites are common on rubber trees in the state of São Paulo and might be used for introduction in the major rubber tree production regions in the state of Mato Grosso. At 70% RH or higher, viability was 70% or higher for all species, indicating that their performance might be higher during the rainy season than during the dry season. Eggs of E. citrifolius and M. camelliae presented higher viability at the lower relative humidity levels than those of other species, indicating that these species might have higher chance to persist in the dry season. It is suggested that M. camelliae should be further evaluated for introduction in the state of Mato Grosso, considering that this mite is not yet present in that area. © Springer 2006.

Measurement of internal moisture distribution in concrete with relative humidity sensors

Padilla Quincot, Gonzalo
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Trabalho de Conclusão de Curso
Publicado em //2012 ENG
Relevância na Pesquisa
689.062%
Dissertação de mestrado integrado em Civil Engineering; The moisture content in concrete is closely related with its structural behaviour. The cement hydration process is the main responsible for the strength growth development and for heat generation, which in turn induces volumetric changes. Furthermore, the drying process of concrete creates tensile stresses that could lead to an initial stress state build-up and limit the concrete ability to carry further tensile stresses, or generate cracks during service life operating conditions. This is an issue that has been subject of attention of recent design codes but still a lot of research has to be developed to fully understand this behaviour. This is due to the enormous variations that may occur on the concrete compositions and on the in-situ environmental conditions, which makes difficult to predict the actual shrinkage deformations and the role of humidity on it. On this regard, the study of shrinkage, cracking, moisture loss, thermal deformations and the evolution of the mechanical properties in concrete since casting and throughout the service life are a crucial issue in order to predict the structural behaviour of concrete. The scope of the present research work is to approach the understanding of the concrete moisture loss process and to contribute with the lack of information in this domain. Different methods of moisture loss measurements inside concrete have been explored but the focus is through relative humidity measurements. On this regard...

Optical fiber relative humidity sensor based on a FBG with a di-ureasil coating

Correia, S.; Antunes, P.; Pecoraro, E.; Lima, P.; Varum, H.; Carlos, L. D.; Ferreira, R.; André, P.
Fonte: MDPI Publicador: MDPI
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
678.53016%
In this work we proposed a relative humidity (RH) sensor based on a Bragg grating written in an optical fiber, associated with a coating of organo-silica hybrid material prepared by the sol-gel method. The organo-silica-based coating has a strong adhesion to the optical fiber and its expansion is reversibly affected by the change in the RH values (15.0–95.0%) of the surrounding environment, allowing an increased sensitivity (22.2 pm/%RH) and durability due to the presence of a siliceous-based inorganic component. The developed sensor was tested in a real structure health monitoring essay, in which the RH inside two concrete blocks with different porosity values was measured over 1 year. The results demonstrated the potential of the proposed optical sensor in the monitoring of civil engineering structures.

Temperature and relative humidity changes during mass production of Ephestia kuehniella (Lepidoptera, Pyralidae).

Tavares, João; Ribeiro, Fernando; Oliveira, Luísa; Vieira, Virgílio
Fonte: Universidad Autónoma de Madrid & Museo Nacional de Ciencias Naturales. Publicador: Universidad Autónoma de Madrid & Museo Nacional de Ciencias Naturales.
Tipo: Conferência ou Objeto de Conferência
Publicado em 29/09/1994 ENG
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Resumo da comunicação apresentada no VI Congreso Ibérico de Entomología, XIII Jornadas de la AeE & VII Congreso de la Spen. Madrid, 26 -30 de Septiembre de 1994.; This study was undertaken to determine the change of the temperature and relative humidity in the life cycle of Ephestia kuehniella Zeller (Lep., Pyralidae) under mass production conditions. A set of 24 cages, disposed over each other (2.5 cm apart) were introduced in a climate chamber (200 cm3), for 41 days. Each cage (6720 cm3 volume) had 10000 individuals during their pre-imaginal development. The climate chamber conditions were the following: 20.33 ± 1.2°C, 63.56 ± 8.7% RH and 16L:8D (the first 25 days) and 21.4 ± 0,9 °C, 70.5 ± 15% RH and 16L:8D (the next 16 days). All cages presented a considerable temperture increase, mainly between the 25th day and the adults emergence. The maximum change in teh termic amplitude (8°C), due to the insect, was observed in the set center cages. On the other hand, relative humidity decresed with temperture augmentation in each set, reaching 20% (center eages) and 10% (extreme cages). In a Biotecnological context, the consequences of temperature and relative humidity changes are discussed.

Effect of relative humidity on creep-shrinkage behaviour of composite tall buildings

Chowdhary,Peeyush; Sharma,Ravi K.
Fonte: Associação Brasileira de Ciências Mecânicas Publicador: Associação Brasileira de Ciências Mecânicas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/05/2013 EN
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Relative humidity of environment affects creep and shrinkage behaviour of a concrete member of composite tall buildings. These buildings are more prone to redistribution of forces as adjacent steel columns and RCC shear walls have quite different characteristics. In this paper, study is carried out to evaluate the effect of relative humidity of environment for a composite building using analytical prediction model, CEB-FIP updated 1999 as the facility of short term testing may not be always available and thus, prediction of creep and shrinkage of concrete at any time by extrapolation is not possible. An accurate procedure, Consistent Procedure, CP available in literature is modified by incorporating analytical prediction model CEB-FIP updated 1999. It has been shown that differential deflections in a composite frame shear wall system are significantly affected by relative humidity. It has been further reported that although, the steel columns have only elastic deformation for the chosen composite frame systems, there is significant increase in design forces when relative humidity decreases.

Effect of relative humidity on emergence and on dispersal and regrouping of first instar Nezara viridula (L.) (Hemiptera: Pentatomidae).

HIROSE, E.; PANIZZI, A. R.; CATTELAN, A. J.
Fonte: Neotropical Entomology, Pelotas, v. 35, n. 6, p. 757-761, Nov./Dec. 2006. Publicador: Neotropical Entomology, Pelotas, v. 35, n. 6, p. 757-761, Nov./Dec. 2006.
Tipo: Artigo em periódico indexado (ALICE)
EN
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Laboratory studies with 1st instar of southern green stink bug, Nezara viridula (L.)ldicated that relative humidity (RH) greatly affected nymph emergence and survivorship up to the 2 nd instar, reaching the maximum value (~ 90%) with RH of> 80%. At 60% RH, 60% of the nymphs energed and survived, while with 0% RH only ~ .15% of eggs hatched, and most nymphs died. Emerged nymphs from egg masses placed in plastic boxes with a gradient of humidity remained on egg shells for ca. one day. After this period, they dispersed and regrouped on top of shells 6.8+- :0.67 times, until they abandoned the shells toward the source of humidity, avoiding the water-saturated areas. Duration taken for each rearrangement (dispersal + regroup) increased with time, with a range of ~ 26 min to 44 min. The mean duration of the grouping behavior on egg shells after each rearrangement decreased from ~ 102 min (1 st) to 24 min (6th and last grouping). The rearrangement behavior of 1 st instars on top of egg shells apparently compensates for the water loss of nymphs.; 2006

An??lise da Umidade Relativa do Ar em Regi??es Homog??neas do Estado do Rio Grande do Sul; Analysis of the Relative Humidity in Homogeneous Regions of Rio Grande do Sul

VAGHETTI, Naile Nunes
Fonte: Universidade Federal de Pelotas; Meteorologia; Programa de P??s-gradua????o em Meteorologia; UFPel; BR Publicador: Universidade Federal de Pelotas; Meteorologia; Programa de P??s-gradua????o em Meteorologia; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
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The knowledge of relative humidity and its interactions with other variables helps plan of various activities, such as the operation of aeration systems for storing grain and seed, the cooling of environments for breeding and maintenance for environmental comfort. The Rio Grande do Sul state, in function of its geographical position, is a region strongly influenced by meteorological systems, in which the behavior of the relative humidity needs further study. The objective of this work was the study of the relative humidity behavior in the state of Rio Grande do Sul, was used data from monthly averages of 26 meteorological stations in the period 1975 to 2009. For this purpose, the homogeneous regions were determined through analysis of grouping and the grouping method of Ward that has better consistent with the climatic characteristics of the state, in which has been obtained four regions: R1, R2, R3 e R4. For all regions, was made a climatologically study through statistical parameters in order to analyze the climatic variability of this variable. The spatial distribution of relative humidity allowed observing that it has a high pattern in the entire state, being the coastal region the most humid. The relative humidity has only in Regions 2 and 3...

Influence of temperature and relative humidity on the moulting success of Amblyomma limbatum and Aponomma hydrosauri (Acari: Ixodidae) larvae and nymphs

Chilton, Neil B.; Andrews, Ross Hector; Bull, Christopher Michael
Fonte: Pergamon-Elsevier Science Publicador: Pergamon-Elsevier Science
Tipo: Artigo de Revista Científica
Publicado em //2000 EN
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This study compared the duration of the moulting periods of engorged larvae and nymphs of the ixodid ticks, Amblyomma limbatum and Aponomma hydrosauri, at different temperature/relative humidity regimes, and examined the relationships between the engorged weight of ticks and their weights after moulting. The results showed that for each species, there was a significant relationship between the weights of unfed nymphs and engorged larvae, and the weights of unfed adults and engorged nymphs. The weight of engorged nymphs was also a good indicator of their sex, with female ticks having heavier weights as engorged nymphs. Temperature and relative humidity had a marked effect on the moulting success of engorged ticks of both species. Aponomma hydrosauri larvae and nymphs were able to moult at lower temperatures than Amb. limbatum but most ticks, except Ap. hydrosauri larvae, failed to moult at 13°C. Additionally, there was a marked decrease in the pre-moult times of ticks at higher temperatures, with larvae taking less time to moult than nymphs. At temperatures greater than 21°C, Amb. limbatum took less time to moult than Ap. hydrosauri but this interspecific difference was less marked for nymphs. The interspecific differences in the responses of engorged larvae and nymphs to different temperatures and relative humidities correlated with interspecific differences in off-host behaviour and with the different climates the two species experience throughout most of their distributional range.; http://www.sciencedirect.com/science/journal/00207519; Copyright © 2000 Australian Society for Parasitology Inc. Published by Elsevier Science Ltd.

Observed relationships between extreme sub-daily precipitation, surface temperature, and relative humidity

Jones, R.; Westra, S.; Sharma, A.
Fonte: Amer Geophysical Union Publicador: Amer Geophysical Union
Tipo: Artigo de Revista Científica
Publicado em //2010 EN
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Expected changes to future extreme precipitation remain a key uncertainty associated with anthropogenic climate change. Recently, extreme precipitation has been proposed to scale with the precipitable water content in the atmosphere, which assuming relative humidity stays constant, will increase at a rate of ∼6.8%/°C as indicated by the Clausius-Clapeyron (C-C) relationship. We examine this scaling empirically using data from 137 long-record pluviograph and temperature gauges across Australia. We find that scaling rates are consistent with the C-C relationship for surface temperatures up to between 20°C and 26°C and for precipitation durations up to 30 minutes, implying that such scaling applies only for individual storm systems. At greater temperatures negative scaling is observed. Consideration of relative humidity data shows a pronounced decrease in the maximum relative humidity for land surface temperatures greater than 26°C, indicating that moisture availability becomes the dominant driver of how extreme precipitation scales at higher temperatures.; Rhys Hardwick Jones, Seth Westra and Ashish Sharma

Fungal biofiltration of α-pinene: Effects of temperature, relative humidity, and transient loads

Jin, Yaomin; Guo, Ling; Kennes, Christian; Veiga, María C.
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica
ENG
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Over the past decade much effort has been made to develop new carrier materials, more performant biocatalysts, and new types of bioreactors for waste gas treatment. In biofilters fungal biocatalysts are more resistant to acid and dry conditions and take up hydrophobic compounds from the gas phase more easily than wet bacterial biofilms. In the present study, a biofilter packed with a mixture of perlite and Pall rings and fed α-pinene-polluted air was inoculated with a new fungal isolate identified as Ophiostoma species. α-Pinene is a volatile pollutant typically found in waste gases from wood-related industries. The temperature of waste gas streams from pulp and paper industries containing α-pinene is usually higher than ambient temperature. Studies were undertaken here on the effect on performance of temperature changes in the range of 15–40°C. The effect of temperature on biodegradation kinetics in continuous reactors was elucidated through equations derived from the Arrhenius formula. Moreover, the effects of the relative humidity (RH) of the inlet gas phase, transient loads (shock or starvation), and the nature of the nitrogen source on α-pinene removal were also studied in this research. The results suggest that the fungal biofilter appears to be an effective treatment process for the removal of α-pinene. The optimal conditions are: temperature around 30°C...

Evaluation of measurement errors of temperature and relative humidity from HOBO data logger under different conditions of exposure to solar radiation

Cunha, Antonio Ribeiro da
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica Formato: 1-11
ENG
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This study aimed to assess measurements of temperature and relative humidity obtained with HOBO a data logger, under various conditions of exposure to solar radiation, comparing them with those obtained through the use of a temperature/relative humidity probe and a copper-constantan thermocouple psychrometer, which are considered the standards for obtaining such measurements. Data were collected over a 6-day period (from 25 March to 1 April, 2010), during which the equipment was monitored continuously and simultaneously. We employed the following combinations of equipment and conditions: a HOBO data logger in full sunlight; a HOBO data logger shielded within a white plastic cup with windows for air circulation; a HOBO data logger shielded within a gill-type shelter (multi-plate prototype plastic); a copper-constantan thermocouple psychrometer exposed to natural ventilation and protected from sunlight; and a temperature/relative humidity probe under a commercial, multi-plate radiation shield. Comparisons between the measurements obtained with the various devices were made on the basis of statistical indicators: linear regression, with coefficient of determination; index of agreement; maximum absolute error; and mean absolute error. The prototype multi-plate shelter (gill-type) used in order to protect the HOBO data logger was found to provide the best protection against the effects of solar radiation on measurements of temperature and relative humidity. The precision and accuracy of a device that measures temperature and relative humidity depend on an efficient shelter that minimizes the interference caused by solar radiation...

Sensor de umidade microeletrônico fabricado em substrato de alumina e baseado na detecção do ponto de orvalho; Microelectronic humidity sensor fabricated on alumina substrate and based in dew point detection

Juvenil Severino da Costa Junior
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 28/02/2011 PT
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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; Sensors for relative humidity are being increasingly used in control systems and data acquisition. These sensors are easily found in greenhouses...

Multisensor MEMS for temperature, relative humidity, and high-g shock monitoring

Smith, Daniel
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
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The use of MEMS (micro-electro-mechanical system) sensors in multiple applications of environmental monitoring help to fill the need of a small scale, low power monitoring and sensing applications. In this design, the use of single-die multiple MEMS sensors to monitor ambient temperature, relative humidity, and accelerative high-g shock were developed and tested. In addition to the sensors, signal conditioning circuits were developed for outputting the sensor data into a microcontroller to analyze and process the signals into useful information for human operators to analyze. The three sensors were fabricated using a bulk micro-machined process on 100mm silicon wafers developed in the RIT SMFL. This work extends previous work on a multisensor from a year earlier. Ion implantation is now used to tune doping levels. To help reduce cross-talk between sensors, p-wells were introduced to aid in substrate isolation. A parallel plate humidity sensor was developed, bringing the need to develop in-line processing of polyimide. Lastly, the one-axis shock sensor is upgraded into a three-axis shock sensor. The temperature sensor is made using a PN diode, utilizing the temperature dependence of the forward bias voltage drop from the Shockley diode equation...

Relative humidity- and ABA-induced variation in carbon and oxygen isotope ratios of cotton leaves

Barbour, Margaret; Farquhar, Graham
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
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Cotton (Gossypium hirsutum L. cv. CS50) plants were grown at two levels of relative humidity (RH) and sprayed daily with abscisic acid (ABA) at four concentrations. Plants grown at lower humidity had higher transpiration rates, lower leaf temperatures and lower stomatal conductance. Plant biomass was also reduced at low humidity. Within each humidity environment, increasing ABA concentration generally reduced stomatal conductance, evaporation rates, superficial leaf density and plant biomass, and increased leaf temperature and specific leaf area. As expected, decreased stomatal conductance resulted in decreased carbon isotope discrimination in leaf material (Δ13C1). Plants grown at low humidity were more enriched in 18O than those grown at high RH, as theory predicts. Within each humidity environment, increasing ABA concentration increased oxygen isotope enrichment of leaf cellulose (Δ18O(c)) and whole-leaf tissue (Δ18O1). Values of Δ13C1 and Δ18O1 predicted by theoretical models were close to those observed, accounting for 79% of the measured variation in Δ13C1 and 95% of the measured variation in Δ18O1. Supporting theory, Δ13C1 and Δ18O1 in whole-leaf tissue were negatively related.

ESTIMATIVA DA UMIDADE RELATIVA DAS 13:00 h, COM BASE NOS DADOS DAS 9:00 h E DAS 15:00 h, PARA O ESTADO DO PARANÁ; Estimative of 1:00 pm relative humidity based on 9:00 am and 3:00 pm data, to Parana state, Brazil

Nunes, José Renato Soares; Soares, Ronaldo Viana; Batista, Antônio Carlos
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 08/03/2006 POR
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This research was based on meteorological data from Cambará, Campo Mourão, Cândido de Abreu, Cascavel, Guarapuava, Londrina, Palmas, Paranavaí and Pinhais regions, Paraná State, Brazil. In order to use Monte Alegre Formula it was necessary to develop equations that estimate the values of Relative Humidity at 13:00 h, from the data of 9:00 and 15:00 h, standard times used in meteorological stations of the Brazilian official network. The meteorological variable used were the relative humidity data at 9:00, 13:00 and 15:00 h. The collected data refer to a period of 5 years, from June 1998 to May 2003. Equations to estimate the 13:00 h relative humidity for each region had to be developed. Equations that presented better fits based on the determination coefficients (R2) and the standard error of residues (sy.x) were submitted to covariance analysis. Similar equations were combined, what generated a general equation that estimates relative humidity at 13:00 h (UR13) based on 9:00 (UR09) data and estimates relative humidity at 13:00 h based on 15:00 (UR15) data to Paraná State. The best equation in the first case was UR13 = e (2,72976 + 0,0162192 UR09) and in the second UR13 = 2,451510 UR15 0,796072.; O presente trabalho foi desenvolvido a partir de dados meteorológicos das regiões de Cambará...

Fiber optic sensing of relative humidity using a twin low coherence interferometer

Khomenko,A.V.; Tapia-Mercado,J.; García-Zarate,M.A.
Fonte: Sociedad Mexicana de Física Publicador: Sociedad Mexicana de Física
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2010 EN
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A fiber-optic implementation of psychrometer is reported. It consists of two Sagnac interferometers with twisted highly birefringent fiber that is used as a temperature sensitive element. One interferometer is used for dry-bulb temperature measurement and the other is for wet-bulb temperature monitoring. The interrogation technique for low coherence interferometric sensor with signal processing in spectral domain is described. The measurement uncertainties for temperature and relative humidity measurements no worse than 0.01°C and 4%, respectively, have been achieved experimentally.

Superconducting depression in thin films of YBa2Cu3O7-δ based on the variation of the relative humidity and the time

Caicedo,J. C.; Saldarraiga,W.; Pérez,F.; Ramirez,J. - G.; Gómez,M. E.; Prieto,P.; Cortés-Escobedo,C.
Fonte: Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. Publicador: Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2007 EN
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Thin films of YBa2Cu3O7-δ grown on SrTiO3 (100) single crystal substrates by sputtering DC technique to high oxygen pressures were put under different conditions of relative humidity from 24 to 100% and different times of exposition. The electrical, morphologic and structural characteristics of the films by means of curves R-T, atomic force microscopy (AFM) and X-ray diffraction (XRD) were analyzed. The effect on structural and transport properties with the environmental conditions of relative humidity and with time were systematically studied. Samples under relative humidity around 24% measured just later of deposition showed a critical temperature (T C) of 92 K, and thin films exposed around 90% of relative humidity with times greater to 10(4) s (1 day) showed a T C of 16 K, while samples under a relative humidity 100% do not showed the superconductive phase. The degradation's causes of superconductive properties in this system were investigated.

DNA degradation of Anopheles darlingi collected at high relative humidity and preserved in isopropanol

Rivero,José; Zoghbi,Normig; Rubio-Palis,Yasmin; Urdaneta,Ludmel; Herrera,Flor
Fonte: Instituto de Altos Estudios en Salud Pública Dr. Arnoldo Gabaldon Publicador: Instituto de Altos Estudios en Salud Pública Dr. Arnoldo Gabaldon
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2007 EN
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Anopheles darlingi mosquitoes, exposed to variable relative humidity (RH) in the field, were preserved during transportation to the laboratory using two different methods: 100% isopropanol at ambient temperature or frozen in liquid nitrogen or dry ice. The DNA isolated from samples collected at RH greater than 91% and preserved in isopropanol was degraded, while DNA isolated from insects kept in liquid nitrogen or dry ice maintained its integrity when collected under conditions of up to 95% RH