Microsensors
Mostrando 1-12 de 22 artigos, teses e dissertações.
-
1. Microssensores magnéticos tipo fluxgate planar utilizando ligas de NiFe eletrodepositadas / Planar microfluxgates using NiFe eletrodeposited cores.
This work present the development of fluxgate magnetic field sensors based on planar technology. The material for the core of the device is based on early works that determined the best NiFe electrodeposition parameters for this application. Functional devices were created proving the usability of the alloy. Also 4 new layouts were proposed in order to build
Publicado em: 2010
-
2. Study of electrochemical detection, using modified electrodes policinilina in view the development of microsensors for the detection of food additives / Estudo da detecção eletroquimica, empregando eletrodos modificados com policinilina, tendo em vista o desenvolvimento de microssensores para a detecção de aditivos alimentares
This work presents a study for development of a microsensor for electrochemical analysis that can be applied in detection of food additives as sulfites and ascorbic acid. The development of low cost electrochemical instrumentation as alternative for commercial instrumentation available is a solution for any problems that appear in electrochemical sensors res
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/12/2009
-
3. Construction of microsensors and its application in biofilms used in wastewater treatment / Construção de microssensores e sua aplicação para estudo de biofilme empregado no tratamento de água residuária
The goal of the current research was the construction of amperometric and potentiometric microsensors to measure dissolved oxygen (DO), hydrogen sulfide (H IND.2S), nitrite, nitrate, ammonium and pH in biofilms applied at wastewater treatment. The biofilms that were analyzed with the constructed microsensors were grown at the surface of flat-plate reactors,
Publicado em: 2009
-
4. Aerobic biofilms for nitrogen removal in flow cells, submitted to different superficial velocities and loading rates / Biofilmes aeróbios para remoção de nitrogênio em células de fluxo, submetidos a diferentes velocidades superficiais e taxas de carregamento
The post-treatment of anaerobic reactor effluents, such as the Upflow Anaerobic Sludge Blanket (UASB), in most applications, is necessary, since this kind of biological treatment promotes BOD removal ranging from 60 to 75% and it has low efficiency in nitrogen and phosphorous removal. Nitrogen removal is usually carried out in a conventional way through nitr
Publicado em: 2009
-
5. Fabrication of ISFET-Microsensors based on Ag and Au Nanoelectrodes / Desenvolvimento de Microssensores do tipo ISFETs a base de Nanoeletrodos de Ag e Au
Conjuntos de transistores de efeito de campo sensíveis a íons (ISFETs) foram desenvolvidos no presente trabalho. Implementou-se durante a fabricação destes uma etapa adicional de anodização que possibilitou a formação de uma fina camada de alumina porosa sobre suas portas. Esta serviu como dielétrico e também molde para o crescimento de nanocristai
Publicado em: 2007
-
6. Glucose microsensor integrated into a catheter / Microssensor para glicose integrado a catéter
The development of electrochemical sensors for glucose integrated into catheters has as basic requisite its miniaturization and the requirement of functioning for relatively long periods in the intravenous environment. The function of such sensors is the continuous monitoring on real time of the clinical evolution of patients hospitalized in intensive therap
Publicado em: 2007
-
7. Reator de leito expandido em escala plena com zonas anaeróbia e aeróbia sobrepostas: remoção conjunta de matéria orgânica e nutrientes e estudo do comportamento microbiológico do biofilme, por respirometria e microsensor de OD / Full scale expanded bed reactor with overlaid anaerobic and aerobic zones: joint removal of organic matter and nutrients and the study of microbiological biofilm behavior and DO microsensor
The current research aimed the development of a 159 M POT.3total volume biological reactor, with a expanded and partially aerated granular coal bed (activated and anthracite), to promote organic matter and nutrients (N and P) removal from wastewater due to the maintenance of anaerobic and aerobic environments, stratified throughout the height of the reactor
Publicado em: 2007
-
8. Experiments on the fundamental mechanisms of boiling heat transfer
The lecture presents a survey of results found by the author and his team during recent years. An experimental technique for precise and systematic measurements of entire boiling curves under steady-state and transient conditions has been developed. Pool boiling experiments for well wettingfluids and fluids with a larger contact angle (FC-72, isopropanol, wa
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-03
-
9. Microscale Distribution of Nitrification Activity in Sediment Determined with a Shielded Microsensor for Nitrate
Microprofiles of O2 and NO3- were measured simultaneously in freshwater sediment with microsensors which were completely free from electrical interference because of coaxial designs. Depth profiles of nitrification (NO3- production) and denitrification (NO3- consumption) were subsequently determined by computer simulation of the measured microprofiles. The n
-
10. Identification and Activities In Situ of Nitrosospira and Nitrospira spp. as Dominant Populations in a Nitrifying Fluidized Bed Reactor
Bacterial aggregates from a chemolithoautotrophic, nitrifying fluidized bed reactor were investigated with microsensors and rRNA-based molecular techniques. The microprofiles of O2, NH4+, NO2−, and NO3− demonstrated the occurrence of complete nitrification in the outer 125 μm of the aggregates. The ammonia oxidizers were identified as members of the Nit
American Society for Microbiology.
-
11. In Situ Analysis of Nitrifying Biofilms as Determined by In Situ Hybridization and the Use of Microelectrodes
We investigated the in situ spatial organization of ammonia-oxidizing and nitrite-oxidizing bacteria in domestic wastewater biofilms and autotrophic nitrifying biofilms by using microsensors and fluorescent in situ hybridization (FISH) performed with 16S rRNA-targeted oligonucleotide probes. The combination of these techniques made it possible to relate in s
American Society for Microbiology.
-
12. Structural and Functional Dynamics of Sulfate-Reducing Populations in Bacterial Biofilms
We describe the combined application of microsensors and molecular techniques to investigate the development of sulfate reduction and of sulfate-reducing bacterial populations in an aerobic bacterial biofilm. Microsensor measurements for oxygen showed that anaerobic zones developed in the biofilm within 1 week and that oxygen was depleted in the top 200 to 4
American Society for Microbiology.