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RESUMO O conteúdo de água no solo é um fator-chave na avaliação nas áreas agrícola e ecológica. O objetivo deste trabalho foi explorar a combinação de informações multisatélites para abordar a questão da baixa precisão na recuperação do conteúdo de água do solo a partir de informações de banda única e fonte única, e estabelecer um modelo para estimativa do conteúdo de água do solo baseado no método multiespectral simulado. Foi realizado um experimento de determinação hiperespectral de amostras de solo (Latossolos) com valores variáveis de teor de água. A reflectância de oito sensores de satélite multiespectral foi remapeada com base nas funções de resposta espectral. Os índices de vegetação (VIs) foram estabelecidos combinando todas as bandas de sensores disponíveis. Os VIs significativos e a reflectância da banda foram extraídos pelos métodos de coeficiente de correlação e análise de importância de dados out-of-bag (OOB), e em seguida modelos lineares e não lineares foram estabelecidos para a estimativa do conteúdo de água no solo. Correlação significativa foi obtida entre refletância multiespectral simulada, VIs e teor de água no solo. Os modelos não lineares apresentaram melhor desempenho que o modelo linear. A combinação do modelo OOB e Random Forest (OOB-RF) obteve a maior acurácia de predição, com R2 calibração e R2 predição de 0,852 e 0,834, respectivamente. De forma geral, verificou-se que o método de modelagem OOB-RF baseado em sensoriamento remoto multiespectral foi viável para estimar o teor de água no solo.

ABSTRACT The soil water content is a key evaluation factor in the agricultural and ecological fields. The objective of this study was to explore the combination of multi-satellite information to address the issue of low accuracy in soil water content retrieval from single-band, single-source information and to establish a model for the estimation of the soil water content based on a simulated multi-spectral method. An experiment involving the hyperspectral determination of soil samples (Oxisols) with varying values of the water content was conducted. The reflectance of eight multi-spectral satellite sensors was resampled based on the spectral response functions. The vegetation indices (VIs) were established by pairing all available sensor bands. The significant VIs and band reflectance were extracted using the correlation coefficient and out-of-bag (OOB) data importance analysis methods, and then linear models and nonlinear models were established for soil water content estimation. A significant correlation was achieved between the simulated multi-spectral reflectance, VIs, and soil water content. The nonlinear models had a better performance than the linear model. The combined OOB and random forest (OOB-RF) model achieved the highest prediction accuracy, with R2 calibration and R2 prediction values of 0.852 and 0.834, respectively. Overall, it was verified that the OOB-RF modeling method based on multi-spectral remote sensing was feasible for estimating the soil water content.

https://doi.org/10.1590/1807-1929/agriambi.v29n6e287460

Estratégias de Proteção Esofágica para Ablação de Fibrilação Atrial: Resultados Comparativos de Avaliações Endoscópicas Consecutivas
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Ferraz, Alberto Pereira

; Pisani, Cristiano Faria

; Rivarola, Esteban Wisnivesky Rocca

; Wu, Tan Chen

; Darrieux, Francisco Carlos da Costa

; Scanavacca, Rafael Alvarenga

; Chokr, Muhieddine Omar

; Hardy, Carina Abigail Melo, Sissy Lara de Hachul, Denise Tessariol Campos, Beatriz Hachul de Scanavacca, Mauricio Ibrahim

Arquivos Brasileiros de Cardiologia

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Mar 2025, Volumen 122 Nº 3 elocation e20230913

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Resumo Fundamento A ocorrência de fístula atrioesofágica após o procedimento ode ablação de fibrilação atrial (FA) continua uma preocupação. Não existe uma abordagem padronizada para minimizar seus riscos e mortalidade. Objetivos Apresentar a experiência de sete anos de um monitoramento endoscópico sistemático de lesão esofágica após a ablação de FA por cateter. Métodos Estudo unicêntrico retrospectivo de avaliação endoscópica sistemática após ablação e FA em procedimentos consecutivos realizados entre 2016 e 2022. Um valor de p < 0.05 foi considerado estatisticamente significativo. Resultados Foram analisados 823 procedimentos de ablação de FA com Esofagogastroduodenoscopia (EGD) de controle. A maioria (n=588; 71,4%) dos pacientes submetidos ao procedimento era do sexo masculino, 575 (69,9%) apresentaram FA paroxística. Monitoramento da temperatura esofágica foi realizada usando um sensor único em 310 pacientes (40,3%) e uma sonda multissensor em 306 (39,8%) pacientes. As lesões estavam presentes em 217 EGD (26,5%): hematoma-equimose em 27 (3,3%), eritema em 14 (1,7%), erosão em 78 (9,5%) e úlcera em 67 (8,2%) pacientes. Nenhuma estratégia de proteção do esôfago foi associada à maior ocorrência de úlceras, com exceção do uso de cateter de ponta de 8mm (14,7% de úlceras com cateter de ponta de 8mm vs. 6,7% com outros cateteres, p = 0,001). Lesões térmicas foram detectadas precocemente e tratadas. A maioria das lesões foi considerada curada na endoscopia, mas um paciente que foi submetido ao isolamento da veia pulmonar com um cateter de ponta de 8mm apresentou fístula esofágica, que foi tratada com sucesso com clipe metálico endoscópico e técnica endoloop. Conclusão A incidência de lesões esofágicas é alta na EGD de rotina realizada após a ablação de FA, embora, na maioria dos casos, sua cura ocorra espontaneamente. Pacientes que se submeteram à ablação com o cateter de ponta de 8mm apresentaram lesões térmicas mais graves. Endoscopia esofágica precoce pode ajudar no diagnóstico de lesões em fases iniciais e a prevenção de fístulas após a ablação de FA.

Abstract Background Atrial-esophageal fistula following AF ablation remains a concern. There is no standardized approach to minimize its risk and morbidity. Objective To present the seven-year experience of a systematic endoscopic surveillance of esophageal injury after AF catheter ablation. Methods This is a retrospective single center registry of systematic endoscopic evaluation after AF ablation in consecutive procedures performed from 2016 to 2022. A p-value of <0.05 was considered statistically significant. Results 823 AF ablation with controlled esophagogastroduodenoscopy (EGD) were analyzed. Most patients (n=588, 71.4%) were male, 575 (69.9%) had paroxysmal AF. Esophageal temperature monitoring was performed using a single sensor in 310 patients (40.3%) and a multi–sensor probe in 306 (39.8%). Lesions were presented in 217 EGD (26.5%): hematoma-ecchymosis in 27 (3.3%), erythema in 14 (1.7%), erosion in 78 (9.5%) and ulcer in 67 (8.2%) patients. No esophageal protective strategy was associated with more ulcers, except the use of 8mm tip-catheter (14.7% of ulcers with 8mm tip catheter vs 6.7% with other catheters, p = 0.001). Thermal lesions were early detected and treated. Most lesions were considered healed at endoscopy, but one patient who underwent pulmonary vein isolation with an 8m tip catheter had esophageal fistula, treated successfully with endoscopic metal clip and endoloop technique. Conclusion The incidence of esophageal lesions at routine EGD following AF ablation is high, although in most of the cases they heal spontaneously. Patients who underwent ablation with the 8mm tip catheter had more severe thermal lesions. Early esophagus endoscopy may help the diagnosis of early-stage lesions and the prevention of fistula formation after AF ablation.

https://doi.org/10.36660/abc.20230913

Yield predictions of ‘Del Cerro’ cotton (Gossypium hirsutum L.) germplasm by multispectral monitoring in the north coast of Peru
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Cruz-Grimaldo, Camila Nieves, Marite Vera, Elvis Duran, Moisés Morales, Arturo Salazar, Wilian Arbizu, Carlos I.

Chilean journal of agricultural research

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Feb 2025, Volumen 85 Nº 1 Paginas 15 - 26

Resumen: En | Texto: En | PDF: En

ABSTRACT Peruvian cotton (Gossypium hirsutum L.) has great acceptance and demand in the national and international textile market due to the excellent quality of its extra-long fiber, durability and resistance. To evaluate cotton cultivar performance, we need to use tools such as drones + sensors. However, these tools have not been widely used in the Peruvian agricultural area. Here we evaluated seven agro-morphological characters of 21 accessions of Del Cerro cotton cultivar from the National Institute of Agrarian Innovation of Peru with high-throughput phenotyping methods. We employed a Matrice 300 RTK unmanned aerial vehicle (UAV) with the MicaSense Dual Red Edge Blue multispectral sensor to assess plant height, yield, and spectral signature during physiological maturity stage; other morphological characters were manually scored. Multispectral monitoring revealed the phytosanitary status of the crop, which begins to enter senescence after 130 d after sowing (DAS) due to the decrease of the vegetation indices (VI). Pearson correlations between yield and VI showed favorable values, exceeding 0.60 at 94 DAS for normalized difference vegetation index (NDVI), relative vigor index (RVI), and normalized difference red edge index (NDRE). Principal component analysis (PCA) was conducted on the same date, a significant correlation was found between NDVI and yield. Additionally, yield prediction equations were generated with the normalized difference water index (NDWI) showing an R value of 0.74 at 130 DAS. The findings of this study suggest that remote sensing evaluation is suitable for estimating ‘Del Cerro’ cotton yield in infrared (IR) bands, providing a tool for germplasm evaluation that can influence decision-making and better conservation strategies.

Lessons from 13 years of accelerometry measurements in five Brazilian cohorts: methodological aspects
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Wendt, Andrea

; Leite, Giulia Salaberry

; Contreira, Renata

; Mielke, Grégore Iven

; Horta, Bernardo Lessa

; Motta, Janaína Vieira dos Santos

; Hartwig, Fernando Pires

; Wehrmeister, Fernando César

; Menezes, Ana Maria Baptista

; Gonçalves, Helen

; Santos, Iná S.

; Matijasevich, Alicia

; Tovo-Rodrigues, Luciana

; Bertoldi, Andréa Dâmaso

; Domingues, Marlos

; Bielemann, Renata Moraes

; Ekelund, Ulf

; Hallal, Pedro C.

; Crochemore-Silva, Inácio

Cadernos de Saúde Pública

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2025, Volumen 41 Nº 3 elocation e00011724

Resumen: Pt En Es | Texto: Pt En Es | PDF: Pt | PDF: En | PDF: Es

Resumo: Este estudo descreve as principais decisões metodológicas e suas justificativas para a coleta, processamento e limpeza/análise de dados de acelerometria nas coortes de nascimento de Pelotas, Rio Grande do Sul, Brasil, exemplificando como a pesquisa usando sensores de movimento pode ser realizada em países de renda média. Trata-se de uma pesquisa descritiva utilizando dados brutos do acelerômetro obtidos de cinco coortes brasileiras de base populacional. A amostra foi composta por dados de 32.963 indivíduos. A coleta de dados (decisões de pré-processamento), processamento (critérios para executar a análise) e as decisões de pós-processamento (limpeza de dados) foram detalhadas. O pré-processamento inclui a escolha da marca/modelo do dispositivo, posicionamento do dispositivo, algoritmos/limites e o número de dias que os participantes foram solicitados a usar os dispositivos. Processamento de dados envolve a aplicação de limites dos algoritmos. Finalmente, o pós-processamento inclui a limpeza de dados. O número mínimo de dias a serem validados para estimar corretamente as médias semanais foi específico para cada idade e tipo de medida. Ao resumir e descrever as decisões metodológicas e protocolo de análise, espera-se que o presente estudo contribua para o desenho de futuros trabalhos que busquem analisar dados do acelerômetro em contextos semelhantes.

Abstract: This study describes key methodological decisions and their justifications for accelerometer data collection, processing, and cleaning/analysis in Pelotas (Rio Grande do Sul State, Brazil) cohorts, exemplifying how research using sensor monitors could be carried out in a middle-income country context. This is a descriptive methodological study using raw accelerometer data from five Brazilian population-based cohorts with 32,963 individuals. Data collection (pre-processing decisions), processing (choosing requirements to run the analysis), and post-processing decisions (data cleaning) are described in detail. Pre-processing includes choosing the device brand/model, placement of the device, algorithms/thresholds, and the number of days participants were required to wear the devices. Processing activities involve applying thresholds/algorithms to the data. Finally, post-processing includes data cleaning. The minimum number of days to be validated to correctly estimate weekly averages was specific to age and measurement. By summarizing and describing the methodological decisions and analysis protocol, we hope to contribute to the design and analysis of accelerometer data in future studies in similar research contexts.

Resumen: Este estudio describe las principales decisiones metodológicas y sus justificaciones para la recopilación, procesamiento y limpieza/análisis de datos de acelerometría en las cohortes de nacimiento de Pelotas, Rio Grande do Sul, Brasil, ejemplificando cómo la investigación que utiliza sensores de movimiento puede llevarse a cabo en países de ingresos medianos. Se trata de una investigación descriptiva que utiliza datos sin procesar del acelerómetro obtenidos de cinco cohortes brasileñas de base poblacional. La muestra consistió en datos de 32.963 individuos. Se detalló la recopilación de datos (decisiones preprocesamiento), el procesamiento (criterios para realizar el análisis) y las decisiones posprocesamiento (limpieza de datos). El preprocesamiento incluye la elección de la marca/modelo del dispositivo, el posicionamiento del dispositivo, los algoritmos/límites y la cantidad de días que se les pidió a los participantes que usaran los dispositivos. El procesamiento de datos implica la aplicación de límites de los algoritmos. Por último, el posprocesamiento incluye la limpieza de datos. El número mínimo de días de validez para estimar correctamente los promedios semanales fue específico para cada edad y tipo de medida. Al resumir y describir las decisiones metodológicas y el protocolo de análisis, se espera que este estudio contribuya a futuros trabajos que busquen analizar los datos del acelerómetro en contextos similares.

https://doi.org/10.1590/0102-311xen011724

Additively Manufactured Collector-Detector Device for Explosive Analysis Using Recycled PLA Filament Loaded with Carbon Black and Graphite
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Souza, Maria M. C.

; Siqueira, Gilvana P.

; Rocha, Raquel G. Crapnell, Robert D. Santana, Mário H. P. Richter, Eduardo M. Banks, Craig E. Muñoz, Rodrigo A. A.

Journal of the Brazilian Chemical Society

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2025, Volumen 36 Nº 4 elocation e-20240186

Resumen: En | Texto: En | PDF: En

We report the electrochemical potential of conductive filaments produced with recycled polylactic acid (rPLA) alongside a mixture of graphite (Gpt) and/or carbon black (CB) and castor oil to create an electrode ready-to-use. Additively-manufactured electrodes (AMEs) were compared with commercial-conductive filament composed of PLA and CB. The Gpt-CB-rPLA and CB-rPLA sensors showed lower charge-transfer resistance (Rct) and a greater heterogenous rate constant, k0, (Rct= 1040 ± 50 Ω and 1810 ± 30 Ω and k0= 6.91 (± 0.58) × 103 and 5.31 (± 0.40) × 103 cm s-1, respectively) compared to the sensor from the commercial filament (Rct = 9620 ± 280 Ω and k0 = 3.62 (± 0.38) ×10-3 cm s-1). The electrochemical response of [Fe(CN6)]3-/4- displayed a peak-to-peak separation of 180 ± 8 mV (Gpt-CB-rPLA) and 240 ± 6 mV (CB-rPLA) compared to commercial AME (740 ±10 mV), without any surface treatment. The filaments were used to create a 2,4,6-trinitrotoluene (TNT) detection platform with linear range of 5-20 and 5-100 µmol L-1 for Gpt-CB-rPLA and CB-rPLA, respectively. The collector-detector device was applied for the analysis of a blast simulation. Finally, it is worth noting that the results obtained are without electrode treatment/activation, indicating that the rough surface of the additively manufactured electrode is an additional feature of the device for collecting explosive residues, simply by rubbing the additively manufactured platform on different surfaces in crime scenarios.

https://doi.org/10.21577/0103-5053.20240186

Sustainable Recycling of Spent Li-Ion Batteries and Iron Ore Tailings for Cobalt Ferrite Synthesis and Its Dual Applications as a Photocatalyst in Solar Photo-Fenton Process and an Electrochemical Sensor
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Almeida, Jenifer R.

; Moura, Mayra N.

; Magnago, Luma B.

; Rocha, Ana K. S.

; Coelho, Edson L. D.

; Ferreira, Sandra A. D.

; Lelis, Maria de Fátima F.

; Freitas, Marcos B. J. G. de

Journal of the Brazilian Chemical Society

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2025, Volumen 36 Nº 2 elocation e-20240137

Resumen: En | Texto: En | PDF: En

This study presents a solution to solid waste problems, focusing on spent lithium-ion batteries (LiBs) and iron ore tailings (IOT) from the Mariana environmental accident in Brazil. The approach involves the production CoFe2O4 from LiBs and IOT, which serves as a catalyst for solar photo-Fenton reactions for methylene blue (MB) decolorization and as an electrochemical sensor for ascorbic acid (AA) detection. Chemical analysis showed recycling potential, with 45.22 ± 0.22% m m−1 Co from LiBs and 14.9 ± 1.5% m m−1 Fe from IOT, determined by inductively coupled plasma atomic emission spectroscopy (ICP OES) and flame atomic absorption spectrometry (FAAS). The sol-gel synthesized CoFe2O4 exhibited a crystallite size of 51.9 ± 1.3 nm and agglomerated crystal clusters. Recycled-CoFe2O4 exhibited a 98.1% MB decolorization efficiency in 60 min under solar irradiation and remained above 92.3% in all 7 reuse cycles. The electrochemical sensor exhibited a coefficient of determination of 0.9987, a sensitivity of 3.352 ± 0.0428 μA mol L−1, and a limit of detection of 0.5511 µM in the concentration range of 1.96 to 23.08 mmol L−1 for AA detection. This study demonstrates the potential of recycled-CoFe2O4 in an environmentally friendly dye removal and as an electrochemical sensor, offering sustainable waste management and resource utilization with solar energy.

https://doi.org/10.21577/0103-5053.20240137

Impact of on-farm and industrial treatments on seed longitudinal distribution for soybeans
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Gracietti, Eduardo A.

; Jasper, Samir P.

; Zimmermann, Gabriel G.

; Mendonça, William S. de

; Jung, Eduardo A.

Revista Brasileira de Engenharia Agrícola e Ambiental

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2025, Volumen 29 Nº 2 elocation e284914

Resumen: En Pt | Texto: En Pt | PDF: En | PDF: Pt

ABSTRACT Adequate seed placement is essential for consistent crop emergence and initial growth. Pneumatic seed metering systems offer superior longitudinal seed distribution accuracy compared to traditional methods, yet certain factors can influence this precision. For instance, seed physical properties may be altered by phytosanitary treatments applied either on-farm or industrially. This study examined the effects of phytosanitary treatment type and graphite addition on soybean seed deposition using an electric-driven pneumatic feeder under simulated sowing conditions. Seed distribution was monitored with an optical sensor. Four treatment groups were established: untreated without graphite, untreated with graphite added, on-farm treated with graphite, and industrially treated with graphite. Parameters assessed included average spacing between seeds, coefficient of variation, precision index, multiple and failed spacings, and percentage of acceptable spacing. Results indicate that prior seed treatment does not significantly affect overall planting accuracy. However, seed spacing varied between the untreated and on-farm treated groups, with the latter demonstrating closer proximity to optimal values. Both on-farm and industrial treatments yielded more uniform seed deposition, as indicated by a lower coefficient of variation. Regardless of seed treatment, the pneumatic feeder consistently performed effectively.

RESUMO A deposição adequada de sementes tem grande importância na uniformidade da emergência e no desenvolvimento inicial das culturas. Uma maior precisão na distribuição longitudinal de sementes é possível com mecanismos dosadores de sementes pneumáticos em relação aos convencionais, mas existem alguns aspectos que afetam essa precisão. Por exemplo, a qualidade física das sementes pode ser impactada pelo seu tratamento fitossanitário, que pode ser feito na propriedade ou na indústria. Nesse contexto, este estudo investigou o impacto do tipo de tratamento fitossanitário e do uso de grafite na deposição de sementes de soja por meio de dosador pneumático com acionamento elétrico em bancada estática, simulando a semeadura e monitorando a distribuição das sementes com sensor óptico. As sementes foram submetidas a quatro tratamentos distintos: sem grafite, sem tratamento com adição de grafite, tratamento on-farm com adição de grafite e tratamento industrial com adição de grafite. Foram estudados o espaçamento médio entre deposições, coeficiente de variação de semeadura, índice de precisão, espaçamentos múltiplos e falhas e percentual de espaçamento aceitável. Os resultados indicam que o espaçamento adequado no plantio não é significativamente impactado pelo método de tratamento prévio das sementes. O espaçamento entre sementes diferiu entre os tratamentos sem grafite e pelo tratamento on-farm, sendo este último mais próximo do ótimo e o tratamento sem grafite mais distante do espaçamento ideal. Um coeficiente de variação de semeadura mais baixo indica que a deposição uniforme foi alcançada com os procedimentos on-farm e industriais. Independentemente do tratamento de sementes, o dosador pneumático demonstrou eficácia.

https://doi.org/10.1590/1807-1929/agriambi.v29n2e284914

Photoluminescent Sensor for Fe3+ Based on Calix[4]arene-Derivative-Modified UiO-66-NH2
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Fonseca, José D. S.

; da Costa, Ohanna M. M. M.

; Alves Júnior, Severino Barros, Bráulio S. Kulesza, Joanna

Journal of the Brazilian Chemical Society

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2025, Volumen 36 Nº 3 elocation e-20240146

Resumen: En | Texto: En | PDF: En

Iron is an important ion that regulates many metabolic functions in the human body, and its deficiency or overload can cause serious health problems. In view of this, the development of tools that can quantify iron in aqueous media is quite valuable. A new material based on a metal-organic framework (MOF) and a calixarene derivative (CALIX), here named CALIX@UiO-66-NH2, was successfully prepared and used as a luminescent sensor for iron ions in a water matrix containing various metal ions. The post-synthetic modification was demonstrated to be efficient on the MOF (UiO-66-NH2) modification, leading to a hybrid platform. The effect of the combination of both components (MOF and CALIX) led to a platform more sensitive to iron detection than the independent compounds. The CALIX@UiO-66-NH2 sensor shows a linear response toward Fe3+ ions with satisfactory linearity (R2 = 0.994) within the concentration range of 6.74 × 10−6−1.72 × 10−5 mol L−1. The limit of detection was determined to be as low as 1.6 mg L−1. The data demonstrate that CALIX@UiO-66-NH2 is an excellent probe for detecting Fe3+, as confirmed by almost complete fluorescence suppression.

https://doi.org/10.21577/0103-5053.20240146

Effect of indices on desertification risk: spatial and hierarchical approach using multinomial logistic regression
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Santos, Thiago Costa dos

; Teixeira, Adunias dos Santos

; Moreira, Luis Clenio Jário

; Toma, Raul Shiso

Revista Ciência Agronômica

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2025, Volumen 56 elocation e202292588

Resumen: En | Texto: En | PDF: En

ABSTRACT Desertification is the degradation process caused by climatic conditions and human activities that results in loss of soil productivity and decline in vegetation growth in the long term. Several indices related to vegetation, soil and climate are used to monitor desertification, but few studies explore qualitative and quantitative aspects of indices on desertification on spatial and hierarchical scale. This study aims to identify and measure indices related to increased risk of desertification on global, local and hierarchical scales using multinomial logistic regression models. Images from TM, ETM+ and OLI sensor from 1997 to 2018 in the end of dry and rainy seasons were used to quantify NDVI, TGSI, albedo, temperature, aridity index, evapotranspiration and precipitation on global spatial scale (Irauçuba Centro Norte) and local spatial scale (Miraíma, Canindé, Irauçuba and Santa Quitéria). GISD was calculated by geometric mean of weighted indices and segmented into 8 classes of susceptibility to desertification (hierarchical scale). The results showed that the best models were obtained on local scale and for the end of the rainy season. Temperature proved to be the most important variable for increased risk of desertification on global, local and hierarchical scales. Therefore, the increase in the risk of desertification in the studied areas is due to human activities of deforestation, overgrazing and fire. These factors contributed to reduction of vegetation cover and increase in temperature, changing the microclimatic, which led to decline in precipitation and worsening of desertification.

https://doi.org/10.5935/1806-6690.20250009

10.

Night-time blood pressure dipping, but not 24-h blood pressure level, is linked to increased 24-h ocular volume slope
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Skrzypecki, Janusz

; Szymański, FM Przybek-Skrzypecka, J. Izdebska, Justyna Ryś-Czaporowska, A. Filipiak, KJ Szaflik, Jacek P.

Arquivos Brasileiros de Oftalmologia

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2025, Volumen 88 Nº 1 elocation e2022-0236

Resumen: En | Texto: En | PDF: En

ABSTRACT Purpose: This study investigated the relationship between blood pressure and intraocular pressure in treatmentnaive, non-glaucoma patients with different blood pressure statuses, focusing on the 24-h ocular volume and nocturnal blood pressure decline. Methods: Treatment-naive, non-glaucoma patients undergoing hypertension evaluation were enrolled as study participants. Simultaneous 24-h ambulatory blood pressure measurement and 24-h ocular volume recording with a contact lens sensor. We also compared ocular volume curve parameters between normotensive and hypertensive patients, as well as between those with and without nocturnal blood pressure decline. Results: A total of 21 patients, including 7 normotensive and 14 treatment-naive hypertensive individuals, were included in the study. of them, 11 were dippers and 10 were non-dippers. No significant difference in the 24-h ocular volume slope was observed between the hypertensive and normotensive patients (p=0.284). However, dippers had a significantly higher 24-h ocular volume slope (p=0.004) and nocturnal contact lens sensor output (p=0.041) than non-dippers. Conclusion: Nocturnal blood pressure decline, rather than the blood pressure level, is associated with the increased 24-h ocular volume slope and nocturnal ocular volume. Further studies are required to determine whether the acceleration of glaucoma progression in dippers is primarily due to low blood pressure, high intraocular pressure, or a combination of both.

https://doi.org/10.5935/0004-2749.2022-0236

11.

DEVICE FOR CALIBRATING ELECTROCHEMICAL DISSOLVED OXYGEN SENSORS
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Sousa, Marcus L.

; Duran, Isabela A.

; Teixeira, Giovana V. Formiga, André L. B.

Química Nova

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2025, Volumen 48 Nº 2 elocation e-20250031

Resumen: En | Texto: En | PDF: En

Sensor calibration for dissolved gas is a critical and necessary step to ensure consistent sensor response over time and under different conditions. In this work, we describe a 3D printed device that facilitates the calibration of gas sensors. The device effectively maintained gas concentration in the solution for at least 2 h. Analytical curves were constructed in the pH range of 2 to 12, yielding determination coefficients surpassing 0.98. The chosen method proved suitable for the calibration of the sensors. Furthermore, using accurate and reliable reference sensors contributed to obtaining precise and trustworthy measurements.

https://doi.org/10.21577/0100-4042.20250031

12.

A HIGHLY SENSITIVE MOISTURE-RESISTANT BTEX SENSOR BASED ON POLYANILINE NANOFIBERS
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Wang, Luyu

; Song, Jia Yu, Chunyang

Química Nova

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2025, Volumen 48 Nº 3 elocation e-20250040

Resumen: En | Texto: En | PDF: En

The real-time sensing of benzene, toluene, ethylbenzene, and xylene (BTEX) vapor has become urgent due to their widespread hazards. As a sensing platform that combines low energy consumption and high sensitivity, moisture-resistant detection of ppb-level BTEX vapor remains a challenge for quartz crystal microbalance (QCM) based gas sensors. In this work, we employed polyaniline nanofibers as the sensing material, significantly enhancing the QCM sensor’s detection capability for BTEX vapor down to the 50 ppb level. Besides, thanks to the hydrophobicity of polyaniline nanofibers, this sensor shows minimal response fluctuations to BTEX vapor in the relative humidity range of 50-90%. Furthermore, this sensor exhibits a short response time and excellent long-term stability, thereby presenting a broad prospect for future industrial applications in BTEX vapor detection.

https://doi.org/10.21577/0100-4042.20250040

13.

Monitoring the spectral and agronomic behaviour of maize in response to nitrogen fertilisation
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Augusti, Mauricio Lourenzoni

; Melo, Valdinar Ferreira

; Uchoa, Sandra Cátia Pereira

; Francelino, Marcio Rocha

; Adandonon, Aston Vestris

; Sounou, Aurele Hosanna Gbenagnon

Revista Ciência Agronômica

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2025, Volumen 56 elocation e202391758

Resumen: En | Texto: En | PDF: En

ABSTRACT Maize is a demanding crop that is responsive to nitrogen fertilisation, and meeting its needs is essential to avoid a loss of productivity or environmental contamination. Monitoring nutrient status during crop development is fundamental for optimising nitrogen fertilisation, and using spectral sensors can help detect spatial variability in the field. Based on this premise, the aim of this study was to evaluate the effectiveness of three low-cost sensors in detecting variability in the spectral and agronomic characteristics of the maize cultivar, BM 3066 PRO2®, induced by different N doses (0, 100, 200 and 300 kg ha-1) under two cropping systems, no-tillage and conventional. The study employed a camera with a sensor in the visible region of the spectrum (RGB), a camera in the visible-infrared region (OCN), both mounted on a drone, and a portable chlorophyll meter. Spatial variability was assessed during the crop cycle using the normalised difference vegetation index (NDVI) and chlorophyll index. The results showed that the NDVI(ON) vegetation index from the OCN sensor was more effective at differentiating the treatments than was the NGR vegetation index from the RGB sensor. Furthermore, the chlorophyll b index was better at detecting variations induced by different nitrogen doses, outperforming the vegetation indices obtained by means of aerial images. The airborne sensors under test are more suitable for detecting early spatial macro-variability, while the chlorophyll meter is more effective at assessing the degree of nitrogen deficiency.

https://doi.org/10.5935/1806-6690.20250026

14.

Systematic design of high-performance CO gas sensor based on QCM and the impact of environmental humidity
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Wang, Luyu

; Ruan, Chenghai Yu, Chunyang Song, Jia

Química Nova

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2025, Volumen 48 Nº 3 elocation e-20250083

Resumen: En | Texto: En | PDF: En

The quartz crystal microbalance (QCM) sensing platform detects a wide variety of gases, yet lacks a system designed specifically for carbon monoxide (CO) gas. Here, we utilized ceric dioxide (CeO2) nanorods as the sensing material and coated them onto the QCM surface to construct a novel QCM sensor. This sensor is capable of detecting CO concentrations as low as 500 ppb and exhibits satisfactory sensitivity, response speed, selectivity, repeatability, and long-term stability. The sensing mechanism and the influence of environmental humidity on this sensor were also explored. This work broadens the application scope of QCM sensing platform and provides an additional solution for detecting CO at room temperature.

https://doi.org/10.21577/0100-4042.20250083

15.

A METHOD FOR MONITORING RICE SEED LOSS BASED ON WOA-BP ALGORITHM
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Chen, Jin

; Shi, Ting Li, Yaoming Zhu, Yahui Niu, Caoyuan

Engenharia Agrícola

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2025, Volumen 45 elocation e30

Resumen: En | Texto: En | PDF: En

ABSTRACT The combine harvester is a widely used piece of agricultural equipment in modern agriculture, and the seed loss rate is one of the important indexes used to measure its operational performance, so the monitoring of the seed loss rate is crucial for adjusting the operational parameters of combine harvesters and improving the quality of grain harvesting. Aiming at the problems of the slow response speed and low monitoring accuracy of the existing domestic seed loss rate monitoring models, this paper proposed a rice seed loss rate monitoring method based on the whale optimization algorithm-back propagation neural network (WOA-BP). The loss rate monitoring device consisted of a piezoelectric ceramic sensor module, charge amplification circuit, band-pass filter circuit, analog-to-digital (AD) converter, main control unit, etc. The WOA-BP algorithm, which has a high accuracy and fast response speed, was used to classify and count the signals to realise seed loss rate monitoring. The indoor test results showed that the relative errors of the monitoring results are less than 8.5% under the condition of a conveying speed of 1.3-2.1m/s, and the relative errors showed an increasing trend as the proportion of straw increased.

https://doi.org/10.1590/1809-4430-eng.agric.v45e20240064/2025

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