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Abstract Introduction : Cerebral venous sinus thrombosis (CVST) is a well-known, although underestimated, cause of stroke in childhood. Its diagnosis requires a high index of suspicion, a correct interpretation of neuroim aging studies and an interrelation between clinicians and radiologists. The clinical features, risk factors and neuroimaging of children under 15 years of age with CVST were analyzed. Methods : multicenter, retrospective, descriptive, study of a consecutive series of cases of children under 15 years of age, who were admitted due to CVST between January 1st, 2010, and March 1st, 2022. Results : The study included 51 patients: 39% with acute symptoms and 59% with subacute symptoms. Newborns predominantly presented encephalopathic symptoms and seizures, while children exhibited signs of intracranial hypertension (ICH). Risk factors were 96 identified in 90% of the cases. Magnetic resonance with angiography in venous time confirmed the diagnosis in 80% of the patients, with the straight sinus being the most affected in newborns and the lateral sinus in chil dren. Hemorrhagic complications were found in 30.5%, being more frequent in newborns. Anticoagulation was initiated in 82% without complications. Sequelae were present in 44.4% of newborns and 37.9% of children, being more frequent and severe in newborns. Conclusions : To make an early diagnosis, it is essen tial to consider CVST in newborns with encephalopathic symptoms and/or seizures, and in children with signs of ICH in the presence of predisposing or triggering conditions.

Resumen Introducción : La trombosis de venas y senos venosos cerebrales (TVSC) constituye una causa conocida, aun que subestimada de ictus en la infancia. Su diagnóstico requiere un alto índice de sospecha, una correcta in terpretación de la neuroimagen e interrelación entre el clínico y el radiólogo. Objetivo : Analizar las manifestaciones clínicas, fac tores de riesgo y neuroimagen de recién nacidos (RN) y niños menores de 15 años con TVSC. Métodos: Estudio descriptivo, retrospectivo, multi céntrico, de una serie consecutiva de casos de menores de 15 años que ingresaron por TVSC entre el 1 de enero del 2010 y el 1 de marzo de 2022. Resultados : El estudio incluyó 51 pacientes: 39% con síntomas agudos y 59% subagudos. En los RN predomi naron síntomas encefalopáticos y convulsiones, mien tras en los niños elementos de hipertensión endocranea na (HTEC). Se identificaron factores de riesgo en el 90% de los casos. La resonancia magnética con angiografía en tiempo venoso confirmó el diagnóstico en el 80%, siendo el seno recto el más afectado en RN y el seno lateral en niños. Se encontraron complicaciones hemorrágicas en 30.5%, siendo más frecuentes en los RN. Se inició anti coagulación en el 82% sin complicaciones. Las secuelas estuvieron presentes en 44.4% de RN y 37.9% de niños, siendo más frecuentes y graves en los RN. Conclusiones : Para realizar un diagnóstico precoz es fundamental pensar en TVSC en RN con síntomas en cefalopáticos y/o convulsiones y en mayores con clínica de HTEC en presencia de enfermedades predisponentes o desencadenantes.

A Reconfigurable Frequency Selective Surface for Wi-Fi Application
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Evangelista, Thamyris da Silva

; Mamedes, Deisy Formiga

; Silva, Jefferson Costa e

; Serres, Alexandre Jean René

; Gomes Neto, Alfredo

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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mar 2023, Volume 22 N. 1 Pages 33 - 46

Abstract: En | Text: En | PDF: En

Abstract This work presents the development of a reconfigurable frequency selective surface (RFSS) for application in the 2400-2483.5 MHz band, standard IEEE 802.11b/g/n (Wi-Fi). The proposed RFSS is based on the four-arms star geometry and PIN diodes were used as switching elements. In the initial design, numerical and measured results, especially for y polarization, PIN diode on-state, shown a difference of 15% for the resonant frequency. To overcome this drawback, a scaling factor was adopted and RFSS was redesigned and characterized, achieving the desired frequency response. The RFSS reconfigurability is confirmed, with a variation of at least 15 dB, when switching the states of the PIN diode. Moreover, the signal strength was measured directly on a notebook, confirming the reconfiguration of the RFSS. Finally, for the y polarization, it was found that for this polarization the frequency response remains virtually unchanged, even for angles of incidence up to 45°. In addition to the Wi-Fi signal control, the observed features make the developed RFSS especially attractive for reconfigurable antennas applications.

https://doi.org/10.1590/2179-10742023v22i1260442

Prediction and prevention of preeclampsia Number 1 - January 2023
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Peixoto Filho, Fernando Maia

; Costa, Fabrício da Silva

; Kobayashi, Sergio

; Beitune, Patricia El

; Garrido, Adriana Gualda

; Carmo, Anselmo Verlangieri

; Rezende, Guilherme de Castro

; Werner Junior, Heron

; Amin Junior, Joffre

; Leão, Jorge Roberto Di Tommaso

; Nardozza, Luciano Marcondes Machado

; Machado, Luiz Eduardo

; Sarno, Manoel Alfredo Curvelo

; Ferreira Neto, Pedro Pires

; Becker Júnior, Eduardo

Revista Brasileira de Ginecologia e Obstetrícia

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2023, Volume 45 N. 1 Pages 49 - 54

Abstract: En | Text: En | PDF: En

https://doi.org/10.1055/s-0043-1763495

Reporter’s communicative performance, while wearing face masks, during the COVID-19 pandemic
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Silva, Joana Domitila Ferraz

; Moreira, Giulia Alfredo

; Penha, Patrícia Brianne da Costa

; Guedes, Aline de Menezes

; Mendes, Amanda Louize Félix

; Ferreira, Danilo Augusto de Holanda

; Silva, Maria Fabiana Bonfim de Lima

Revista CEFAC

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2023, Volume 25 N. 4 elocation e5122

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT Purpose: to identify the impact of wearing protective face masks on reporters’ communicative performance during the COVID-19 pandemic and verify whether there was an association between these aspects. Methods: a quantitative, descriptive, cross-sectional study with a sample of 32 reporters (16 females and 16 males) who worked, during the pandemic. Most participants had a bachelor’s degree (n = 28; 87.5%). The sample’s mean age was 35.09 years (SD = 9.41), and they had been working in the area for a mean of 10.09 years (SD = 7.62). Reporters answered an online form with 26 questions, developed by the researchers, on their self-perception of voice and communicative performance when wearing a mask, during the pandemic. Data were descriptively analyzed, and the chi-square test was applied with the Statistical Package for the Social Sciences 20 (SPSS). Results: most reporters (n = 20; 62.5%) classified their voices and speech articulation as good (n = 19; 59.4%) and reported difficulties hearing and/or being heard by interviewees in noisy places and perceived their voices were lower, muffled, or with a low volume (n = 28; 87.5%). Also, 22 (68.8%) reported having to speak louder than usually to be heard. Lastly, the questions on reporters’ communicative performance were associated with wearing masks while reporting. Conclusion: wearing protective face masks, during reportage, negatively impacted reporters and was associated with their communicative performance.

RESUMO Objetivo: identificar o impacto do uso de máscara de proteção facial na performance comunicativa dos repórteres durante a pandemia da COVID-19, bem como verificar se existe associação entre esses aspectos. Métodos: trata-se de um estudo transversal, de caráter descritivo, com abordagem quantitativa. Participaram 32 repórteres que atuaram durante a pandemia, sendo 16 do sexo feminino e 16 do sexo masculino. A maioria dos participantes tinha ensino superior (n = 28; 87,5%). A amostra apresentou média de idade de 35,09 anos (DP = 9,41) e tempo de atuação na área de 10,09 anos (DP = 7,62). Os repórteres responderam a um formulário online composto por 26 questões, elaborado pelos próprios pesquisadores, sobre a autopercepção vocal e performance comunicativa do repórter com o uso de máscara durante a pandemia. Foi realizada análise descritiva dos dados e aplicado o teste Qui-quadrado por meio do software Statistical Package for Social Sciences 20 (SPSS). Resultados: a maioria dos repórteres (n = 20; 62,5%) classificou sua voz e articulação de fala como boas (n = 19; 59,4%). A maioria dos participantes relatou sentir dificuldade de ouvir e/ou ser ouvido pelo entrevistado em locais com ruído e perceber a sua voz mais baixa, com pouco volume ou abafada (n= 28; 87,5%), bem como 22 (68,8%) relataram ter que falar mais alto do que o normal para ser ouvido. Por fim, verificou-se a presença de associações entre as questões sobre a performance comunicativa dos repórteres e o uso de máscaras durante as reportagens. Conclusão: os repórteres apresentaram impactos negativos com uso das máscaras de proteção facial durante as reportagens, bem como verificou-se associação entre o uso destas com a performance comunicativa.

https://doi.org/10.1590/1982-0216/20232545122

Sequential application of herbicide options for controlling Conyza sumatrensis in soybean pre-sowing
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Paiola Albrecht, Leandro

; Paiola Albrecht, Alfredo Junior

; Moreira Silva, André Felipe

; Ramos, Romulo Augusto

; Rodrigues da Costa, Karine Yone

; Viana de Araújo, Gabriel

; Thaís Mundt, Tamara

; Colombari, Corina

Revista de la Facultad de Ciencias Agrarias. Universidad Nacional de Cuyo

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dec 2022, Volume 54 N. 2 Pages 83 - 93

Abstract: Es En | Text: Es En | PDF: Es | PDF: En

Resumen El objetivo de este estudio fue evaluar la eficacia de los herbicidas aplicados secuencial mente para controlar Conyza sumatrensis, una de las malezas más ampliamente distribuidas en todo el mundo, en la pre siembra de soja. El estudio se realizó en condiciones de campo en el estado de Paraná, Brasil, en la campaña 2018-2019. El experimento consistió en un diseño de bloques al azar con cuatro repeticiones, con 12 tratamientos compuestos por diferentes mezclas de herbicidas aplicados antes de la siembra. Se evaluó el control de C. sumatrensis, daño a plantas de soya y variables relacionadas con el comportamiento agronómico. Los niveles de control fueron altos para todos los tratamientos, excepto para el que estaba libre de saflufenacil en cualquiera de las dos aplicaciones. Estos resultados resaltan la importancia de saflufenacil en el control de C. sumatrensis y son prometedores para el uso de saflufenacil/imazethapyr cuando se considera el sistema y otras malezas. Todos los tratamientos estudiados fueron selectivos a la soja, que mostró mayores valores de daño en presencia de diclosulam; sin embargo, esto no comprometió el comportamiento agronómico de la soja.

Abstract The aim of this study was to evaluate the efficacy of sequentially applied herbicides to control Conyza sumatrensis, one of the most widely distributed weeds worldwide, in soybean pre-sowing burndown. The study was conducted under field conditions in the state of Paraná, Brazil, at 2018-2019 growing season. The experiment consisted of a randomized block design with four replicates, with 12 treatments consisting of different herbicide mixtures applied before sowing. Control of C. sumatrensis, injury to soybean plants, and variables related to agronomic performance were evaluated. The control levels were high for all treatments, except for the one that was free of saflufenacil in either of the two applications. These results highlight the importance of saflufenacil in the control of C. sumatrensis and show promise for the use of saflufenacil/imazethapyr when considering the system and other weeds. All studied treatments were selective to soybean, which showed higher injury values in the presence of diclosulam; however, this did not compromise the agronomic performance of soybean.

An alternative energy generation from charcoal produced from Brazilian pine (Araucaria angustifolia (Bert.) O. Ktze) seed residues
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Sampaio, Danielle Affonso

; Santos Junior, Alfredo José dos

; Dias Júnior, Ananias Francisco

; Lelis, Roberto Carlos Costa

Química Nova

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oct 2022, Volume 45 N. 10 Pages 1183 - 1188

Abstract: En | Text: En | PDF: En

The perspective is that the energy demand will grow in the coming decades worldwide. The search for renewable energy sources is urgent and necessary. Residual biomass may be a promising source of raw material for obtaining bioenergy. Thus, this research sought to evaluate the energetic and physicochemical properties of residues from the seeds of Brazilian pine (Araucaria angustifolia (Bert.) O. Ktze). The chemical analysis included the extractive, holocellulose, and Klason lignin contents. The residues were pyrolyzed according to the final temperature of each process (300 ºC - 550 ºC) and a control treatment. The proximate analysis was performed to determine the moisture content, volatile matter, ash, and fixed carbon. We determined bulk density, the higher heating value, and the net heating value. The determination of the energetic density was also calculated. The residues showed significant values in lignin and extractives. The pyrolysis treatments performed at the final temperature of 350 ºC and 400 ºC presented a higher value of gravimetric charcoal yield. The charcoal obtained at 500 ºC and 550 ºC had better energetic properties. The Brazilian pine seed residues under the pyrolysis process presented desirable energy characteristics, showing its potential for use as a raw material in bioenergy generation.

https://doi.org/10.21577/0100-4042.20170924

Effect of forage aqueous extracts on Glycine max L. Merr., Zea mays L. and Bidens pilosa L.
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Costa Zonetti, Patricia da

; Dotto, Gabriela

; França de Carvalho, Terciliana Francielle

; Souza Bido, Graciene de

; Carvalho Gomes Corrêa, Rúbia

; Paiola Albrecht, Leandro

; Junior Paiola Albrecht, Alfredo

Revista de la Facultad de Ciencias Agrarias. Universidad Nacional de Cuyo

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jun 2022, Volume 54 N. 1 Pages 70 - 76

Abstract: Es En | Text: Es En | PDF: Es | PDF: En

Resumen El objetivo del presente estudio fue investigar la posible influencia de la alelopatía de los extractos acuosos de cultivos forrajeros, aislados o en consorcio, sobre rendimiento fisiológico de las semillas de soja [Glycine max (L.) Merr.] y de maíz (Zea mays L.), además de su fitotoxicidad en la hierba Bidens pilosa L. Se prepararon extractos acuosos a una concen tración del 5%. Los estudios con soja y maíz se llevaron a cabo humedeciendo los papeles de germinación correspondientes a los diferentes tratamientos y se realizaron dentro de los estándares de las Reglas de Análisis de Semillas de Brasil. Estudios con los extractos en las semillas de B. pilosa se llevaron a cabo en una cámara de tipo B.O.D. Se colocaron cincuenta semillas de malezas en caja gerbox conteniendo papel de filtro humedecido con los diferentes tratamientos en cinco repeticiones. El agua destilada se utilizó como control en todas las pruebas. Los extractos de Avena strigosa y Raphanus sativus L., cultivados tanto en forma aislada como en consorcio, aumentaron el porcentaje de germinación de semillas (%G) y la longitud de las plántulas de soja. Asimismo, los extractos de Pennisetum glaucum (L.) R.Br. y Crotalaria spectabilis Roth, cultivados aislados y en consorcio, proporcionaron ganancias en el %G de maíz. Además, todos los extractos evaluados suprimieron la germi nación y redujeron la velocidad del índice de germinación de la maleza en comparación con el control, siendo el extracto de R. sativus el que más redujo el % G de B. pilosa.

Abstract The aim of the present study was to investigate the potential allelopathic effects of isolated or intercropped aqueous forage extracts on the physiological performance of soybean [Glycine max (L.) Merr.] and corn (Zea mays L.) seeds, as well as their phytotoxicity to the weed species Bidens pilosa L. Aqueous extracts were prepared at a concentration of 5%, and the tests with soy and corn were conducted by wetting the germination papers with different treatments and performing procedures within the standards of the Brazilian Rules of Seed Analysis. Tests with the cover plant extracts on the seeds of B. pilosa used BOD-type repetitions. Fifty weed seeds were placed in a gerbox with filter paper moistened with the different treatments with five repetitions. Distilled water was used as the control in all tests. Extracts of Avena strigosa Schreb and Raphanus sativus L. (radish), cultivated individually and in combination, increased the seed germination percentage (%G) and the length of soybean seedlings. Similarly, extracts of Pennisetum glaucum (L.) R.Br and Crotalaria spectabilis Roth, in individual and combined cultivation, provided gains in corn %G. Furthermore, all tested extracts suppressed germination and decreased the speed of the germination index of the hairy beggarticks when compared to the control, with the radish extract showing the greater reduction effect on the %G of the weed plant B. pilosa.

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Avaliação da sazonalidade do fenômeno da primeira carga de lavagem em um sistema de captação e armazenamento de águas pluviais
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Souza, Caroline Moreira de

; Almeida, Jaqueline Costa Areas de

; Alves, Letícia Delduque

; Domingos, Ryan Rodrigues

; Bila, Daniele Maia

; Ohnuma Júnior, Alfredo Akira

Engenharia Sanitaria e Ambiental

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jun 2022, Volume 27 N. 3 Pages 571 - 583

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO O escoamento superficial de áreas urbanas é capaz de transportar poluentes para os sistemas de armazenamento de água. O objetivo deste trabalho foi avaliar a concentração de poluentes no dispositivo de separação inicial, denominado first flush (FF), e no reservatório (RR), conforme as estações do ano, em amostras de água de chuva, por meio da Concentração Média do Evento (CME) e das curvas M(V). A metodologia consistiu na análise de 68 amostras coletadas em um sistema de águas pluviais (SAP) na cidade do Rio de Janeiro (RJ), entre 2013 e 2019, e no tratamento estatístico de dados. Foram analisados os parâmetros turbidez (TU), sólidos totais dissolvidos (STD), alcalinidade (ALC) e cloreto (CLO) nos dispositivos FF e RR. Os resultados indicaram baixa correlação de dados entre os parâmetros e as estações do ano. No verão, a precipitação propiciou maior diluição dos poluentes, em que os parâmetros TU e STD apresentaram valores menores, quando comparado às outras estações do ano, sobretudo em razão da instabilidade atmosférica. Os parâmetros CLO e ALC indicaram elevada ocorrência da primeira carga de lavagem (PCL) na primavera. O FF apresentou uma CME de turbidez de 73 UNT, enquanto no RR o valor foi de 4,3 UNT. Nos demais parâmetros analisados, o comportamento foi similar, de modo a evidenciar a concentração de poluentes no dispositivo FF, como medida de separar o volume inicial escoado superficialmente. Conclui-se que a instalação do FF é fundamental em sistemas de águas pluviais em razão da redução significativa da CME pelo descarte inicial de poluentes no volume armazenado no RR, independentemente da estação do ano.

ABSTRACT Surface runoff in urban areas is able to carry pollutants to water storage systems. The purpose of this study was to assess the concentration of pollutants in the initial diverter systems called First Flush (FF), and Reservoir (RR) rainwater samples by means of Average Event Means Concentrations (EMCs) and Concentration Curves (CC) in accordance with the seasons of the year. The methodology consisted of an analysis of 68 samples collected from the rainfall system of Rio de Janeiro (RJ), from 2013 to 2019, and statistical data handling. The parameters of Turbidity (TU), Total Dissolved Solids (TDS), Alkalinity (ALK), and Chloride (CHLO) in the FF and RR systems were analyzed. The results showed that there was a low correlation of data between the parameters and seasons of the year. In Summer, precipitation led to a greater dilution of the pollutants since the TU and TDS parameters had lower values than was the case in other seasons of the year, largely as a result of atmospheric instability. The CHLO and ALK showed that the first wash load (FWL) occurred more often in the Spring. The FF had a turbidity EMC of 73 UNT, while in the case of RR, the value was 4.3 UNT. The pattern of behavior was similar in the other parameters that were analyzed and provided evidence that the concentrations of pollutants in the FF system, are a means of separating the initial volume of runoff on the surface. It was concluded that the installation of FF is essential in rainfall systems due to the significant reduction of the EMC by the initial disposal of pollutants in the volume stored in the reservoir, regardless of the season of the year.

https://doi.org/10.1590/s1413-415220210025

A Defected Ground Structure Based on Matryoshka Geometry
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Gomes Neto, Alfredo

; Silva, Jefferson Costa e

; Coutinho, Ianes Barbosa Grécia

; Camilo Filho, Saulo Souto

; Santos, Danila Araújo

; Albuquerque, Bruno Lima Cavalcanti de

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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jun 2022, Volume 21 N. 2 Pages 284 - 293

Abstract: En | Text: En | PDF: En

Abstract A Defected Ground Structure, DGS, based on matryoshka geometry is described in this paper. The proposed DGS geometry is outlined and initial design equations are presented. Four prototypes, with resonant frequencies 2.17 GHz, 2.44 GHz, 2.99 GHz and 3.73 GHz, were designed, fabricated and characterized, observing a good agreement between measured and numerical results. Also, the obtained results demonstrated the initial design equations usefulness. The resonant behavior was analyzed in terms of the current density and it is possible to observe the current density blocked at the resonant frequency. When compared with dumbbell DGS, a reduction in the resonant frequency up to 47.19% is achieved, confirming the matryoshka geometry miniaturization properties. Furthermore, still comparing with dumbbell geometry, DGS based on matryoshka geometry are more selective.

https://doi.org/10.1590/2179-10742022v21i2256115

10.

Recomendaciones de manejo de los anticoagulantes orales directos (DOACs) anti Xa y anti IIa
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Ceresetto, José M.

; Tajer, Carlos

; Duboscq, Cristina

; Bottaro, Federico

; Casais, Patricia

; Korin, Jorge

; Fondevila, Carlos

; Giumelli, Carla

; Scazziota, Alejandra

; Rossi, Andrea

; Botto, Fernando

; Ariscancela, Maria Ester

; Martinuzzo, Marta

; Zaidel, Ezequiel

; Fitz Maurice, Mario

; Bahit, Cecilia

; Vazquez, Fernando

; Molnar, Soledad

; Saizberg, Simón

; Negri Aranguren, Pedro

; Rosa, Claudio

; Fedele, José Luis

; Comignani, Pablo

; Pombo, Gonzalo

; Raña, Pablo

; Adamczuk, Yolanda

; Martí, Alejandra

; Charask, Adrián

; Penchasky, Diana

; Riveros, Dardo

; Mariani, Javier

; Puente, Dolores

; Celebrin, Lucia

; Bosio, Martín

; Brodsky, Andrés

; Sanchez Lucero, Analía

; Castillo Costa, Yanina

; Hirschson, Alfredo

; Arbesú, Guillermo

; Viñuales, Susana

; Kazelian, Lucía

; Maneyro, Alberto

; Gutierrez, Victoria

; Castro Rios, Miguel

; Gagliardi, Juan

; Lescano, Adrián

; Repetto, Fernanda

Medicina (Buenos Aires)

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apr 2022, Volume 82 Suppl. 2 Pages 1 - 55

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

Abstract Direct oral anticoagulants have emerged as the drugs that have changed the man agement of the antithrombotic treatment in the last 15 years. Their advantages, like a more friendly way of anticoagulation and their lower risk of bleeding, especially in the brain, have positioned these new anticoagu lants as the first drug of choice in the two most frequent indications of anticoagulation, atrial fibrillation, and the venous thromboembolic disease. However, not all the patients can receive these agents, not all the direct oral anticoagulants have the same characteristics, and most importantly, not all the diseases with an indication of an anticoagulant drug can be treated with them. Therefore, it is mandatory that all the faculties involved in the management of these drugs must know them in depth, to decide the best treatment for the patient. This position paper, from a group of experts in anticoagulation in Argentina, can help the general practitioner in the daily use of direct oral anticoagulants based on the new evidence and the experience of a wide group of professionals. The way we relate to the anticoagulant treatment has changed in the last years. The doctors who work with them must also do so.

Resumen Los anticoagulantes orales directos han surgido como una de las herramientas que ha cambiado el manejo de la enfermedad trombótica en los últimos 15 años. Sus ventajas, desde el punto de vista de la facilidad de uso y menor riesgo de sangrado, especialmente de sangrado cerebral, han posicionado a estos nuevos anticoagulantes como la primera alternativa de tratamiento en las dos indicaciones más frecuentes en que necesitamos estas drogas, la fibrilación auricular y la enfermedad tromboembólica venosa. Sin embargo, no todos los pacientes pueden recibir estos agentes, no todos los anticoagulantes directos tienen las mismas pro piedades y fundamentalmente, no todas las enfermedades con indicación de un anticoagulante pueden tratarse con ellos;con lo cual es necesario que todos los profesionales que están involucrados en el manejo de estos medicamentos estén obligados a conocerlos en profundidad, para poder decidir el mejor tratamiento en cada caso particular. Este documento de posición de expertos de diferentes especialidades de Argentina, presenta lineamientos para el uso correcto de los anticoagulantes directos en base a nueva evidencia y a la experiencia de uso de un amplio grupo de profesionales. La forma de relacionarnos con el tratamiento anticoagulante ha cambiado. Los médicos que trabajamos con ellos también debemos hacerlo.

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11.

Application of satellite imagery to update depth-area-volume relationships in reservoirs in the semiarid region of Northeast Brazil
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Moura, Marina de P.

; Ribeiro Neto, Alfredo

; Costa, Fábio A. da

Revista Brasileira de Engenharia Agrícola e Ambiental

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jan 2022, Volume 26 N. 1 Pages 44 - 50

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Os reservatórios são a principal fonte de abastecimento de água na região semiárida do Estado de Pernambuco, Brasil, devido à constante escassez de água que impacta essa região. O conhecimento da quantidade de água disponível é extremamente importante para uma gestão eficaz dos recursos hídricos. O cálculo do volume de água armazenado nos reservatórios é feito com as curvas cota-área-volume. Porém, na maioria dos reservatórios localizados no semiárido, essa relação está desatualizada. Nesse sentido, o objetivo deste estudo foi explorar o potencial e as limitações da aplicação do método ISODATA de classificação não supervisionada para calcular as relações cota-área-volume de reservatórios localizados na região semiárida do Estado de Pernambuco, Brasil. A aplicação do método ISODATA foi avaliada em três reservatórios no Estado de Pernambuco, Poço da Cruz, Barra do Juá e Jucazinho. Os resultados foram comparados com curvas atualizadas dos reservatórios obtidas recentemente a partir de levantamento batimétrico e técnica LiDAR. O método ISODATA apresentou resultados satisfatórios para os três reservatórios analisados. O erro médio absoluto do volume em Poço da Cruz e Barra do Juá foi inferior a 1% da capacidade máxima. A tendência de subestimação da área superficial diminuiu no reservatório de Poço da Cruz usando o método ISODATA em comparação com o uso de índices espectrais.

ABSTRACT Reservoirs are the primary source of water supply in the semiarid region of Pernambuco state, Brazil, because of the constant water scarcity affecting this region. Knowledge of the amount of water available is essential for the effective management of water resources. The volume of water stored in the reservoirs is calculated using the depth-area-volume relationship. However, in most reservoirs in the semiarid region, this relationship is currently out of date. Therefore, the objective of this study was to explore the potential and limitations of the application of the ISODATA unsupervised classification method to calculate the depth-area-volume relationships of reservoirs in the semiarid region of Pernambuco, Brazil. The application of the ISODATA method was evaluated in three reservoirs in the state of Pernambuco, i.e., Poço da Cruz, Barra do Juá, and Jucazinho. The results were compared with the updated curves of reservoirs obtained from bathymetry and recent LiDAR surveys. The ISODATA method presented satisfactory results for the three reservoirs analyzed. The mean absolute error of the volume in Poço da Cruz and Barra do Juá was lower than 1% of the maximum capacity. The use of the ISODATA method meant that the surface area underestimation tendency in the Poço da Cruz reservoir was less than when spectral indices were used.

https://doi.org/10.1590/1807-1929/agriambi.v26n1p44-50 61 downloads

12.

Orchidists’ profile, management and perception of the main pests in orchid cultivation
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Silva, Ana Catia Santos da

; Carvalho, Carlos Alfredo Lopes de

; Machado, Cerilene Santiago

; Costa, João Albany

; Almeida, Rebeca Santisma de Jesus

; Santos, Jiclecia Almeida dos

; Alves, Rogério Marcos de Oliveira

; Sodré, Geni da Silva

Arquivos do Instituto Biológico

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2022, Volume 89 elocation e00502020

Abstract: En | Text: En | PDF: En

ABSTRACT This study investigated the profile of orchidists, their cultivation practices, and their knowledge about pests in orchid cultivation in the state of Bahia. There were applied 74 questionnaires to producers (amateurs and commercials) in 23 municipalities. The data were submitted to univariate statistics using the chi-square test, the Mann–Whitney U-test and the Kruskal–Wallis H-test. The survey shows that orchid cultivation is mostly practiced by women (67.6%) and those with higher education (48.7%). Most respondents were amateurs (87.8%). Insects (39.9%) and diseases (32.5%) were the main organisms associated with phytosanitary problems. The presence of insects was reported to occur mainly in the leaves (47%), mainly mealybugs (46.3%). Correspondence was significant between commercial and amateur groups according to the pairwise Mann–Whitney U-test(1) = 370.04 and p < 0.01. The Kruskal–Wallis H-test(27) = 924.78 and p < 0.01 discriminated categories between the groups. Despite the growing interest in orchid cultivation in the state of Bahia, most orchidists are amateurs. The study warns about the risk of pest dispersion between crops since exchanging plants and purchasing specimens in open markets are common practices.

https://doi.org/10.1590/1808-1657000502020

13.

A presença da ausência: um paradoxo geográfico
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Silva, Leonardo Luiz Silveira da

; Costa, Alfredo

GEOUSP

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2022, Volume 26 N. 2 elocation e195614

Abstract: Pt En Es | Text: Pt En Es | PDF: Pt | PDF: En | PDF: Es

Resumo A partir de uma abordagem que trata mente e matéria como planos indissociáveis, defendemos a hipótese de que, em qualquer avaliação de caráter espacial, o espaço ausente é parte do espaço presente. A presença da ausência se manifesta tanto no deslocamento de materialidades heterotópicas quanto na experiência humana, que nos permite carregar valores e impressões de paisagens e lugares que vivenciamos outrora. Assim, construímos a ideia de que a presença da ausência é um paradoxo verificado na análise geográfica. Por meio de uma abordagem epistemológica, mostramos que nossa percepção é sempre enviesada pelas experiências situadas no espaço-tempo, que ensejam alterações nos gostos e preferências que desenvolvemos acerca do espaço. A reflexão deste artigo nos permite considerar a flexibilização de nossas manifestações etnocêntricas à medida que defendemos o fato de que cada um de nós porta uma excepcionalidade mundana.

Abstract In this article, we start from the perspective that mind and matter are inseparable planes to defend the hypothesis that, in any spatial evaluation, the absent space is part of the present space. The presence of absent space manifests itself both in the realm of the displacement of heterotopic materialities and in the realm of human experience. It allows us to carry with us values and impressions about the landscapes and places we once experienced. Thus, we propose the idea that the presence of absence is a paradox verified in geographical analysis. Through an epistemological approach, we demonstrate that our perception is always biased by experiences located in space-time, which provide changes in the tastes and preferences that we develop about space. The reflection of this article allows us to consider the flexibilization of our ethnocentric manifestations as we defend the fact that each of us is bearers of a worldly exceptionality.

Resumen Desde un enfoque que trata mente y materia como planos inseparables, defendemos la hipótesis de que, en cualquier valoración de carácter espacial, el espacio ausente forma parte del espacio presente. La presencia de la ausencia se manifiesta tanto en el ámbito del desplazamiento de materialidades heterotópicas como en el ámbito de la experiencia humana, que nos permite llevar con nosotros valores e impresiones sobre los paisajes y lugares que alguna vez vivimos. Así, construimos la idea de que la presencia de la ausencia es una paradoja verificada en el análisis geográfico. A través de un abordaje epistemológico, demostramos que nuestra percepción siempre está sesgada por experiencias ubicadas en el espacio-tiempo, las cuales propician cambios en los gustos y preferencias que desarrollamos sobre el espacio. La reflexión de este artículo nos permite considerar la flexibilización de nuestras manifestaciones etnocéntricas al defender que cada uno de nosotros es portador de una excepcionalidad mundana.

https://doi.org/10.11606/issn.2179-0892.geousp.2022.195614.pt

14.

Evaluation of mesenchymal cells and dapsone for the treatment of dermonecrotic wounds caused by Loxosceles laeta venom in rabbits
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Martins, Guilherme de Caro

; Barreto, Maira Souza Oliveira

; Botelho, Ana Flávia Machado

; Gamba, Conrado

; Duarte, Clara Guerra

; Soto-Blanco, Benito

; Bicalho, Adriane Pimenta Costa-Val

; Cassali, Geovanni Dantas

; Goes, Alfredo Miranda de

; Olórtegui, Carlos Delfin Chávez

; Melo, Marília Martins

Ciência Animal Brasileira

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2022, Volume 23 elocation e-72573E

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Este estudo teve como objetivo avaliar a eficácia das células-tronco mesenquimais (CTMs), isoladas ou associadas à dapsona (DAP), no tratamento de feridas dermonecróticas causadas pelo veneno de Loxosceles laeta. Vinte e cinco coelhos machos foram distribuídos em cinco grupos. O controle negativo recebeu água ultrapura (C-), enquanto todos os outros grupos foram injetados com 20 μg de veneno de L. laeta. Após 4 horas, cada grupo recebeu um dos seguintes tratamentos: PBS (C+), DAP, CTMs e DAP + CTMs. Os animais foram avaliados diariamente durante 12 dias, e feitos registros fotográficos para análise da ferida e no 12º dia, foram eutanasiados e, retiradas amostras de pele para análise histológica. Observou-se que a DAP apresentou o melhor percentual de contração da ferida no terceiro dia. Nos tratamentos com CTMs, observou-se uma contração negativa da ferida tanto para as CTMs isoladas, bem como a associação CTMs + DAP em relação ao PBS, possivelmente, pelo aumento da infamação inicial após a aplicação de células-tronco. Isso é devido ao fato de que as CTMs secretam um amplo espectro de moléculas bioativas como citocinas e fatores de crescimento que favorecem a regeneração. Histologicamente, observou-se que os animais de C+ apresentaram extensas áreas de necrose, úlceras, infiltrado neutrofílico, além de mineralização. Houve aumento de deposição de colágeno no tratamento CTMs + DAP, no entanto, a vascularização permaneceu inalterada. Este é o primeiro relato usando CTMs e CTMs + DAP como tratamento para loxoscelismo cutâneo e mais estudos são necessários para determinar seu uso como terapia alternativa para lesões demonecróticas causadas pela aranha Loxosceles.

Abstract This study aimed to evaluate the efficacy of mesenchymal stem cells (MSC), alone or associated with dapsone (DAP), in treating dermonecrotic wounds caused by Loxosceles laeta venom. Twenty-five male rabbits were distributed into five groups. Negative control received ultrapure water (C-), whilst all other groups were injected with 20 μg of L. laeta venom. After 4 hours, each group received one of the following treatments: PBS (C+), DAP, MSC, and DAP+MSC. Animals were evaluated daily and photographic records made for analysis of wound area. Twelve days after, animals were euthanized and skin samples removed for histological analysis. We observed that DAP showed the best percentage of wound contraction at day 3. In the treatments using MSCs, a negative value of wound contraction was observed for the isolated MSCs, as well as a lower contraction value for the association of the MSC + DAP when compared to PBS, probably, by the increase in initial infammation after the application of stem cells, due to the fact that MSCs secrete a broad spectrum of bioactive molecules such as cytokines and growth factors that favor regeneration. Histologically, it was observed that animals of C+ showed extensive areas of necrosis, ulcers, neutrophilic infiltrate, and mineralization. Collagen deposition showed increase in MSC+DAP treatment, however vascularization remained unchanged. This is the first report using MSC and MSC+DAP as a treatment for cutaneous loxoscelism and more studies are needed to determine its use as an alternative therapy for dermonecrotic lesions caused by Loxosceles spider.

https://doi.org/10.1590/1809-6891v23e-72573e

15.

Development of Reconfigurable Frequency Selective Surface Associating Cross Dipoles and Matryoshka Geometries
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Gomes Neto, Alfredo

; Silva, Jefferson Costa e

; Coutinho, Ianes Barbosa Grécia

; Fernandes, Diego Cássio Garcia

; Duarte, Laryssa Maria de Sousa

; Barboza, Amanda Gomes

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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dec 2021, Volume 20 N. 4 Pages 714 - 725

Abstract: En | Text: En | PDF: En

Abstract A reconfigurable frequency selective surface, FSS, associating cross dipoles and matryoshka geometries is described in this paper. The proposed reconfigurable FSS uses as active element PIN diodes. With the associated geometries, three resonant frequencies are achieved, two fixed, related to the matryoshka geometry, and one that can be activated or not, related to the cross dipoles geometry. Differently from previous works, an inductor was inserted into the cross dipoles’ horizontal arms, maintaining its resonance for x polarization. The PIN diode inserted into cross dipoles’ vertical arms controls the respective resonance. The design procedures for each geometry, in addition to PIN diode and RF inductor basics are outlined. The expected results are discussed based on the analysis of the resonances of each geometry and the associated geometries, as well as the different PIN diode bias states (OFF and ON). A prototype was fabricated and characterized, obtaining a good agreement between the numerical and experimental results, with a reconfiguration bandwidth of 0.24 GHz, from 2.12 GHz to 2.36 GHz, for a variation of at least 10 dB between the OFF and ON states.

https://doi.org/10.1590/2179-10742021v20i4254765

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