Gas Sensors
Mostrando 1-12 de 53 artigos, teses e dissertações.
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1. Development and characterization of gas sensors using thin films of polyaniline as active layer
ABSTRACT This work aimed at the development and characterization of gas sensing devices using thin films of polyaniline (PAni) as active layer, deposited by in situ polymerization. The polyaniline, an intrinsically conductive polymer, was used due to its high sensitivity to gases, low response time and stability, ease of synthesis and low cost. The sensor wa
Matéria (Rio J.). Publicado em: 06/12/2018
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2. Estudio ab initio de propiedades electrónicas y estructurales de nanopartículas de SnO2 bajo presión
ABSTRACT Tin oxide (SnO2) has important applications, including as an elective material in the development of gas sensors. These devices improve their sensitivity and decrease their work temperature when the nanoparticle size is in the nanoscale order. Therefore, the gas sensor raises its efficiency noticeably. For this reason, the research of behavior at th
Matéria (Rio J.). Publicado em: 19/07/2018
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3. Novel Route for Fabrication of ZnO nanorods-Au Nanoparticles Hybrids Directly Supported on Substrate and their Application as Gas Sensors
The aim of this study was to develop a novel, simple and fast route to prepare ZnO nanorods (NRs) -Au nanoparticles (NPs) hybrids directly supported on a substrate to be used in gas sensor devices. The ZnO NRs were promptly grown on interdigitated Au electrodes Al2O3 substrates by chemical bath deposition at a low temperature. After that, Au NPs were deposit
Mat. Res.. Publicado em: 23/04/2018
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4. Analysis of Styrene Polymerization Without Surfactant and N2 Gas in Cylindrical Flask.
The conditions of chemical synthesis can be crucial for polymerization of styrene in such a way that it can be produced latex beads at nanometric range (ϕ < 400nm). In this work, it will be analyzed how the absence of N2 and surfactant will result in colloidal particles with high affinity to agglomerate forming two kinds of nanostructured assemblies: colloi
Mat. Res.. Publicado em: 22/01/2018
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5. Focal cryotherapy: step by step technique description
ABSTRACT Introduction and objective: Focal cryotherapy emerged as an efficient option to treat favorable and localized prostate cancer (PCa). The purpose of this video is to describe the procedure step by step. Materials and methods: We present the case of a 68 year-old man with localized PCa in the anterior aspect of the prostate. Results: The procedure
Int. braz j urol.. Publicado em: 2017-10
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6. Nitrogen Oxide (NO) Gas-Sensing Properties of Bi2MoO6 Nanosheets Synthesized by a Hydrothermal Method
Bi2MoO6 nanosheets were synthesized by a hydrothermal method. Morphology and structure of the Bi2MoO6 nanosheets were analyzed by SEM, XRD, N2 adsorption techniques and XPS. Gas-sensing properties of the as-prepared Bi2MoO6 sensors were also systematically investigated. The results showed the reaction temperature greatly affected the morphology and structure
Mat. Res.. Publicado em: 11/05/2017
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7. LOW-COST AUTOMATION OF FERTIGATION WITH PROGRAMMABLE LOGIC CONTROLLER AND GAS-FILLED SENSORS
ABSTRACT The aim of this study was to develop and evaluate a low-cost automation system for management of different fertigation regimes in tomato plants (Solanum lycopersicum L.) grown in a protected environment. The system consisted of an irrigation controller coupled to substrate moisture sensors and to a programmable logic controller (PLC). Four water reg
Eng. Agríc.. Publicado em: 2017-04
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8. ACOUSTIC ENVIRONMENT AND GAS PRODUCTION IN DIFFERENT GROWING-FINISHING SWINE FACILITIES
ABSTRACT This study aimed to evaluate gas levels and the acoustic environment (noise) of growing-finishing swine in different facilities, one composed of shallow pool (SP) and another of partially slatted floor (PSF). Sensors and a sound level meter were used to measure gas concentrations (CO2 and NH3) and noise at 1.50 meters above the ground and at animal
Eng. Agríc.. Publicado em: 2016-12
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9. The level of environmental noise affects the physiological performance of Glycine max under water deficit
Plants in natural environments are subjected to a multitude of environmental cues. However, studies addressing physiological analyzes are usually focused on the isolation of a stress factor, making it difficult to understand plants behavior in their extremely complex natural environments. Herein, we analyzed how environmental variability (noise) may influenc
Theor. Exp. Plant Physiol.. Publicado em: 2013
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10. DIAGNOSIS OF FAULTS IN POWER TRANSFORMERS USING SEMICONDUCTOR GAS SENSORS. / DIAGNÓSTICO DE FALHAS EM TRANSFORMADORES DE POTÊNCIA UTILIZANDO SENSORES DE GAS SEMICONDUTORES.
Esta dissertação introduz o estudo do uso de uma matriz de sensores de gases de dióxido de estanho na detecção de falhas em transformadores de potência, através dos gases dissolvidos no óleo. O objetivo desta pesquisa é analisar os dados obtidos pelos sensores de gás, utilizando algumas técnicas de reconhecimento de padrão, e desta forma, verific
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/2012
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11. Aplicações de corrosão por plasma usando reatores ICP e RIE para tecnologia MEMS / Plasma etching applications using ICP and RIE reactors for MEMS technology
This thesis is based on etching processes applications in cold plasmas (room temperature) using RIE (Reactive Ion Etching) and ICP (Inductively Coupled Plasma), as reactors, applied to specific areas of microelectronics and MEMS devices in semiconductors industries and laboratories. Five applications are presented: Thinning gate CMOS Transistor - conventiona
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/08/2012
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12. Simulações de sensores de gás nanoscópicos baseados em nanotubos de carbono: estrutura eletrônica e transporte de elétrons / Computational simulations of nanoscopic gas sensors based on carbon nanotubes: electronic structure and electronic transport
Since their discovery by S. Iijima in 1991, carbon nanotubes have been considered as one of the most promising nanostructured materials for the development of new nanoscopic electronic devices. Due to its high surface area to volume ratio, this material stands out as a candidate for possible gas sensoring applications. In this thesis, we have studied, by mea
Publicado em: 2011