Filter Paper Method
Mostrando 1-12 de 151 artigos, teses e dissertações.
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1. Bandpass Filter Using SIW Technology in Inductive Window Topology with Low-Cost Substrate FR-4
Abstract This paper features a step-by-step procedure for designing, simulate, and manufacture a bandpass filter using an inductive window topology within the substrate integrated waveguide (SIW) technology. We have chosen an operating frequency in the microwave range compatible with IoT circuits, employing a dielectric material, the FR-4, which is low cost
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Otimização da extração de antocianinas presentes no feijão-preto e impregnação do extrato em matriz polimérica natural para uso como indicador de pH
OPTIMIZATION OF THE EXTRACTION OF ANTHOCYANINS PRESENT IN BLACK BEANS AND IMPREGNATION OF THE EXTRACT IN NATURAL POLYMERIC MATRIX FOR USE AS A pH INDICATOR. In this work, a method of extracting natural indicators, anthocyanins, present in black beans was optimized. The best extraction condition was obtained with 50 g of beans and 93 g of water, under agitati
Química Nova. Publicado em: 2022
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3. Evaluation of bioherbicidal potential of Carica papaya leaves
Resumo Devido ao aumento do número de ervas daninhas resistentes aos herbicidas, é necessário explorar o potencial alelopático das plantas como uma alternativa. A pesquisa foi conduzida com o objetivo de investigar os efeitos alelopáticos do pó foliar de Carica papaya e do extrato aquoso das sementes, bem como das sementes pré-germinadas de Avena fatu
Braz. J. Biol.. Publicado em: 21/10/2019
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4. A comparison of methods for the detection of Ascochyta rabiei in chickpea seeds
RESUMO A saúde das sementes é um dos fatores mais importantes que afetam a qualidade das sementes de grão-de-bico (Cicer arietinum). O presente estudo tem como objetivo comparar e identificar melhores métodos de incubação para a detecção de Ascochyta rabiei associada a sementes de grão-de-bico. Quatro protocolos foram comparados em sua sensibilidade
Summa phytopathol.. Publicado em: 10/07/2019
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5. Fluorescent Sensors Based on Cu-Doped Carbon Quantum Dots for the Detection of Rutin
In this paper, Cu-doped carbon quantum dots (Cu-CQDs) were prepared by carrying out thermolysis of Na2[Cu(EDTA)] and hydroxylamine hydrochloride at 300 ºC for 2 h. The as-prepared Cu-CQDs were characterized by UV-Vis, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diff
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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6. Phytosanitary quality of Brachiaria brizantha ‘BRS Piatã’ seeds in function of climate conditions
RESUMO A semente infectada é um dos principais veículos de transmissão de patógenos, responsáveis por perdas significativas em campos de produção e, as condições sanitárias destas dependem do inóculo e dos fatores climáticos presentes. Assim, objetivou-se identificar variáveis climáticas das regiões que propiciam a produção de sementes de Br
Rev. bras. eng. agríc. ambient.. Publicado em: 2019-04
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7. Satellite Inertia Parameters Estimation Based on Extended Kalman Filter
ABSTRACT: The moment of inertia parameters play a critical role in assuring the spacecraft mission throughout its lifetime. However, determination of the moment of inertia is a key challenge in operating satellites. During satellite mission, those parameters can change in orbit for many reasons such as sloshing, fuel consumption, etc. Therefore, the inertia
J. Aerosp. Technol. Manag.. Publicado em: 28/03/2019
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8. Use of a combined SVD-Kalman filter approach for induction motor broken rotor bars identification
Abstract This paper describes a new parametric spectral estimator for the identification of rotor bar fault of an induction motor by analyzing the stator current. This approach combines two methods: The first one, the Singular Value Decomposition method which allows the accurate detection and location of the fault's signature frequency. The second method all
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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9. Modeling and FPGA-based implementation of an efficient and simple envelope detector using a Hilbert Transform FIR filter for ultrasound imaging applications
Abstract Introduction Although the envelope detection is a widely used method in medical ultrasound (US) imaging to demodulate the amplitude of the received echo signal before any back-end processing, novel hardware-based approaches have been proposed for reducing its computational cost and complexity. In this paper, we present the modeling and FPGA impleme
Res. Biomed. Eng.. Publicado em: 15/01/2018
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10. A wavelet-based method for power-line interference removal in ECG signals
Abstract Introduction The analysis of electrocardiogram (ECG) signals allows the experts to diagnosis several cardiac disorders. However, the accuracy of such diagnostic depends on the signals quality. In this paper it is proposed a simple method for power-line interference (PLI) removal based on the wavelet decomposition, without the use of thresholding t
Res. Biomed. Eng.. Publicado em: 2018-01
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11. A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors
This paper presents a low-cost reflectometer for selective detection of Cu2+. The reflectometer is based on an emission light source using five light-emitting diodes at different wavelengths and a detector using a webcam. The samples were prepared using a filter paper-based colorimetric sensor with ascorbic acid-based quinoxaline derivative. Video analysis u
J. Braz. Chem. Soc.. Publicado em: 2017-12
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12. MEASUREMENT AND ANALYSIS OF A FIELD AREA BASED ON AN ADAPTIVE KALMAN FILTER
ABSTRACT: This paper proposed the use of an adaptive Kalman filter (AFK) to improve Global Positioning System (GPS) positioning accuracy to measure a tractor operational area. First, we used MATLAB to identify the operation trajectory. Then, we used different colors to show the area of operation. Finally, we used an image-processing method to calculate the e
Eng. Agríc.. Publicado em: 2017-09