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Flyrock in surface mining - Part 3: Shock wave, stress wave, blasthole expansion
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Szendrei, T.

; Tose, S.

Journal of the Southern African Institute of Mining and Metallurgy

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Sep 2024, Volumen 124 Nº 9 Paginas 507 - 516

Resumen: En | Texto: En | PDF: En

The generally accepted view in rock blasting is that the sources of energy for the fracture and movement of rock reside in the shock wave and gas action resulting from the explosion, and yet the mechanisms by which these sources interact with the rock have remained unclarified. It has also been noted that up to 50% of the work capacity of an explosive released in a blast cannot be accounted for by field measurements of energy partitioning. In this study, we describe a physical model that details the response of rock to both shock wave and gas action. An analytical model based on momentum conservation is derived to describe the dynamics of shock-driven expansion of the blasthole. Radial expansion of the hole is the key parameter that permits the derivation of the following characteristics of rock response to shock loads: hole expansion time; volume of displaced rock; energy consumed per unit volume; expansion energy efficiency; stress wave pulse length; gas pressure in enlarged hole. Soon after the completion of hole expansion, the shock wave degenerates to an elastic stress wave that runs through the burden. Blasthole expansions of between 50% and 300% of diameter are completed in under 1 ms and, depending on rock properties, consume 32% to 42% of the detonation energy or about 55% of the available mechanical (Gurney) energy. Gas pressure in the enlarged holes in five rock types is between 35 MPa and 650 MPa, and drives the mass movement of burden rock.

https://doi.org/10.17159/2411-9717/3321/2024

Navigating the waves in Colombia: a cohort study of inpatient care during four COVID-19 waves Colombia COVID19 COVID 19 COVID-1 COVID1 1 COVID-
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Rebellón-Sánchez, David E.

; Guzmán, Tania M.

; Rodriguez, Sarita

; Llanos-Torres, Julio

; Vinueza, Daniela

; Tafurt, Eric

; Beltrán, Estefanía

; Martínez, Álvaro

; Rosso, Fernando

Brazilian Journal of Infectious Diseases

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2024, Volumen 28 Nº 2 elocation 103737

Resumen: En | Texto: En | PDF: En

ABSTRACT Introduction: Understanding the intricate dynamics between different waves of the COVID-19 pandemic and the corresponding variations in clinical outcomes is essential for informed public health decision-making. Comprehensive insights into these fluctuations can guide resource allocation, healthcare policies, and the development of effective interventions. This study aimed to compare the characteristics and clinical outcomes of COVID-19 at peak transmission points by including all patients attended during the first four pandemic waves in a referral center in Colombia. Material and methods: In a prospective observational study of 2733 patients, clinical and demographic data were extracted from the Fundacion Valle de Lili's COVID-19 Registry, focusing on ICU admission, Invasive Mechanical Ventilation (IMV), length of hospital stay, and mortality. Results: Our analysis unveiled substantial shifts in patient care patterns. Notably, the proportion of patients receiving glucocorticoid therapy and experiencing secondary infections exhibited a pronounced decrease across waves (p < 0.001). Remarkably, there was a significant reduction in ICU admissions (62.83% vs. 51.23% vs. 58.23% vs. 46.70 %, p < 0.001), Invasive Mechanical Ventilation (IMV) usage (39.25% vs. 32.22% vs. 31.22% vs. 21.55 %, p < 0.001), and Length of Hospital Stay (LOS) (9 vs. 8 vs. 8 vs. 8 days, p < 0.001) over the successive waves. Surprisingly, hospital mortality remained stable at approximately 18-20 % (p > 0.05). Notably, vaccination coverage with one or more doses surged from 0 % during the initial waves to 66.71 % in the fourth wave. Conclusions: Our findings emphasize the critical importance of adapting healthcare strategies to the evolving dynamics of the pandemic. The reduction in ICU admissions, IMV utilization, and LOS, coupled with the rise in vaccination rates, underscores the adaptability of healthcare systems. Hospital mortality's persistence may warrant further exploration of treatment strategies. These insights can inform public health responses, helping policymakers allocate resources effectively and tailor interventions to specific phases of the pandemic. Introduction COVID19 COVID 19 COVID-1 decisionmaking. decisionmaking decision making. making decision-making allocation policies Colombia methods 273 Lilis Lili s Registry admission IMV, , stay Results patterns Notably 0.001. 0001 0.001 . 001 Remarkably 62.83% 6283 62 83 (62.83 vs 5123 51 23 51.23 5823 58 58.23 4670 46 70 46.7 0.001, (IMV 39.25% 3925 39 25 (39.25 3222 32 22 32.22 3122 31 31.22 2155 21 55 21.5 LOS (LOS 9 ( days Surprisingly 1820 18 20 18-2 0.05. 005 0.05 05 0.05) 6671 66 71 66.7 wave Conclusions utilization rates systems mortalitys responses COVID1 1 COVID- 27 000 0.00 00 62.83 628 6 (62.8 512 5 2 51.2 582 58.2 467 4 7 46. 39.25 392 3 (39.2 322 32.2 312 31.2 215 21. 182 18- 0.0 667 66. 62.8 (62. 51. 58. 39.2 (39. 32. 31. 0. 62. (62 39. (39 (6 (3

https://doi.org/10.1016/j.bjid.2024.103737

Ceratomyxa matosi n. sp. (Myxozoa: Ceratomyxidae) parasitizing the gallbladder of Boulengerella cuvieri (Characiformes: Ctenoluciidae) State of Amapá, Brazilian Amazon n sp Myxozoa (Myxozoa Ceratomyxidae Characiformes (Characiformes Ctenoluciidae Amapá
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Martel, Clemildo Silva

; Souza, Fábio de Abreu e

; Vidal, Samuel Carvalho

; Carvalho, Abthyllane Amaral de

; Hamoy, Igor Guerreiro

; Nascimento, Lilia Suzane de Oliveira

; Videira, Marcela Nunes

Revista Brasileira de Parasitologia Veterinária

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2024, Volumen 33 Nº 3 elocation e011024

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

Abstract Myxozoa is a class of the Phylum Cnidaria made up of endoparasites from aquatic habitats. The genus Ceratomyxa preferentially infects marine fish, with the gallbladder being the main site parasitized. This study aimed to describe a new species of Ceratomyxa found in this organ in Boulengerella cuvieri using morphological, morphometric characterization and phylogenetic analysis of 18S rDNA gene sequences. Specimens of B. cuvieri were collected, anesthetized, desensitized and biometric measurements were performed. The organs were analyzed under a stereomicroscope and fragments of internal organs were extracted for light microscopy analysis, preserved in 80% ethanol for 18S rDNA gene analysis and fixed in Davidson solution for histological processing. Free spores of Ceratomyxa were observed in the gallbladder, in plasmodia with wave-like movements, with the following dimensions: spore width (24.5 ± 0.4) µm, spore length (5.2 ± 0.3) µm, polar capsule width (1.8 ± 0.2) µm, polar capsule length (2.1 ± 0.3) µm, number of polar tubule turns (4-5) and 100% prevalence. Phylogenetic analysis confirmed that Ceratomyxa matosi n. sp. is a new species, grouped with other freshwater Ceratomyxa species from the Amazon, representing the second description of species of this genus in the state of Amapá. habitats fish parasitized morphological S sequences B collected anesthetized performed 80 processing wavelike wave like movements dimensions 24.5 245 24 5 (24. 0.4 04 0 4 µm 5.2 52 2 (5. 0.3 03 3 1.8 18 1 8 (1. 0.2 02 2.1 21 (2. 45 (4-5 100 prevalence n sp Amazon Amapá 24. (24 0. 5. (5 1. (1 2. (2 (4- 10 ( (4

Resumo Myxozoa é uma classe do Filo Cnidaria, constituída por endoparasitos de habitats aquáticos. O gênero Ceratomyxa infecta, preferencialmente, peixes marinhos, sendo a vesícula biliar o principal sítio parasitado. Este estudo objetivou descrever uma nova espécie de Ceratomyxa encontrada nesse órgão em Boulengerella cuvieri usando caracterização morfológica, morfométrica e análise filogenética de sequências do gene 18S rDNA. Exemplares de B. cuvieri foram coletados, anestesiados, dessensibilizados e realizada aferição biométrica. Os órgãos foram analisados em estereomicroscópio, e fragmentos de órgãos internos foram extraídos para análise por microscopia de luz, preservado em etanol a 80%, para análise do gene 18S rDNA, e fixados em Davidson para processamento histológico. Por meio de ML, foram observados esporos livres de Ceratomyxa na vesícula biliar, em plasmódios com movimentos ondulatórios, com as seguintes dimensões: largura dos esporos (24,5±0,4) µm; comprimento dos esporos (5,2 ± 0,3) µm; largura da cápsula polar (1,8±0,2) µm; comprimento da cápsula polar (2,1 ± 0,3) µm; número de espiras do túbulo polar (4-5) e prevalência de 100%. A análise filogenética confirmou que Ceratomyxa matosi n. sp. é uma nova espécie, agrupando-se com outras espécies de Ceratomyxa de água doce da Amazônia, representando a segunda descrição de uma espécie desse gênero no estado do Amapá. Cnidaria aquáticos infecta preferencialmente marinhos parasitado morfológica S rDNA B coletados anestesiados biométrica estereomicroscópio luz 80 80% histológico ML ondulatórios dimensões 24,5±0,4 24504 24 5 0 4 (24,5±0,4 µm 5,2 52 2 (5, 0,3 03 3 1,8±0,2 1802 1 8 (1,8±0,2 2,1 21 (2, 45 (4-5 100 100% n sp agrupandose agrupando se Amazônia Amapá 24,5±0, 2450 (24,5±0, 5, (5 0, 1,8±0, 180 (1,8±0, 2, (2 (4- 10 24,5±0 245 (24,5±0 ( 1,8±0 18 (1,8±0 (4 24,5± (24,5± 1,8± (1,8± 24,5 (24,5 1,8 (1,8 24, (24, 1, (1, (24 (1

https://doi.org/10.1590/s1984-29612024058

Insights into the flow characteristics of tsunami bores and surges: a case study of Malaysian Coastline surges
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Moon, Wei Chek

; Lau, Tze Liang

; Puay, How Tion

Ocean and Coastal Research

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2024, Volumen 72 elocation e24067

Resumen: En | Texto: En | PDF: En

Abstract Tsunamis, despite their rarity, are among the deadliest natural disasters, inflicting catastrophic damage on both coastal and inland regions. Given their highly site-specific impact, a comprehensive understanding of tsunami wave flow characteristics is crucial for effective tsunami preparedness and for safeguarding civil engineering structures. This study investigates the formation and progression of tsunami bores as they transition into surges near the shore. We employed a wave-flume experimental approach, with a specific focus on the Malaysian coastline. Experiments took place in a wave flume with a length of 40 m and a platform designed to replicate the gentle slopes commonly found in Malaysian coastal areas vulnerable to tsunamis. The primary focus lied in measuring key flow parameters, including flow depths and velocities near the shore. Wet bed bores were marked by a sudden rise in water depth and considerable air entrainment in the front region. As these waves transformed into dry bed surges, the front slope became gentler, and aeration diminished, while peak velocities increased. Additionally, the study also delves into the relations between flow depth and velocity concerning Froude numbers and momentum flux. The outcomes contribute significantly to global initiatives aimed at improving coastal resilience against tsunamis. Tsunamis rarity disasters regions sitespecific site impact structures shore waveflume approach coastline 4 tsunamis parameters region gentler diminished increased Additionally flux

https://doi.org/10.1590/2675-2824072.23200

An outbreak within an outbreak: The impact of infection prevention and control strategies on hospital-acquired infections and the occurrence of multidrug-resistant organisms during the COVID-19 pandemic
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Mashigo, B

; Parker, A

; Lalla, U

; Allwood, B W

; Moolla, M S

; Lovelock, T

; Koegelenberg, C F N

SAMJ: South African Medical Journal

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Dic 2023, Volumen 113 Nº 12 Paginas 1544 - 1547

Resumen: En | Texto: En | PDF: En

BACKGROUND: The coronavirus disease 2019 (COVID-19) pandemic placed an unprecedented strain on intensive care units (ICUs) in South Africa. Infection prevention and control (IPC) strategies were highlighted to minimise the risk to healthcare workers and for the protection of patients from contracting hospital-acquired infections (HAIs). During the third wave, our institution adopted a shift system to address severe burnout among ICU personnel. We noted an upstroke in the occurrence of HAIs, specifically carbapenem-resistant Enterobacterales (CRE) and multidrug-resistant (MDR) Acinetobacter baumannii OBJECTIVES: To report these outbreaks, compare the rate of CRE and A. baumannii infections with the first COVID-19 wave and to analyse its impact on patient outcomes METHOD: We retrospectively analysed data from a prospectively collected registry involving all adult patients with severe COVID-19 admitted to the dedicated COVID-19 ICU from May 2021 to September 2021. Information from the admission database, including the patients' demographics, comorbidities, laboratory results and length of ICU stay were extracted RESULTS: Ninety patients were admitted with severe COVID-19 during the third wave. There was an outbreak of both CRE (the majority Klebsiella pneumoniae) and A. baumannii. Furthermore, 18 patients cultured the same CRE organism, and 25 patients cultured the environmental organism A. baumannii. The HAI rate was significantly higher compared with the first wave published data: 59/90 (65.6%) v. 73/363 (20.1%, p<0.01). Patients with any HAI had a longer mean stay in ICU (10.1 days v. 6.7 days (p<0.01) and a higher mortality of 48/59 (81%) v. 19/31 (61%) (p=0.05 CONCLUSION: We observed a very significant rise in HAIs in the COVID-19 ICU during the third wave compared with the first, with almost three times as many patients developing HAIs. Unsurprisingly, it was associated with a longer mean stay in ICU and a higher mortality. The outbreak of both CRE and A. baumannii, and the fact that many patients cultured the same CRE organism and A. baumannii, strongly suggests that a critical breakdown in IPC measures had occurred

https://doi.org/10.7196/samj.2023.v113i12.971

Continuous Wave of Condensation Improves the Filling of Curved Canals: a Micro-CT Study
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Pinto, Jader Camilo

; Pivoto-João, Mariana Mena Barreto

; Guerreiro-Tanomaru, Juliane Maria

; Reyes-Carmona, Jessie Fabiola

; Tanomaru-Filho, Mario

Odovtos International Journal of Dental Sciences

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Dic 2023, Volumen 25 Nº 3 Paginas 32 - 42

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

Abstract The aim of this study was to compare the filling capacity in curved root canal using a new continuous wave of condensation technique (Termo Pack II, Easy Dental Equipments, Brazil) or lateral compaction. The percentage of voids in the filling of mesial root canals of mandibular molars was assessed by micro-computed tomography (micro-CT). Mesial root canals (n=24) of mandibular molars with a degree of curvature between 20° and 40° were prepared using rotary system (ProDesign Logic, Easy, Brazil) up to #35, .05 taper. The root canals were filled by using the continuous wave of condensation system or lateral compaction and AH Plus sealer (n=12). Scanning at 9 µm was performed after preparation and after filling by using micro-CT SkyScan 1176. The volumetric percentage of filling material and voids (total length and in each root canal third) were calculated. Data were analyzed using ANOVA/ Tukey and Student’s t tests (α=0.05). Before the filling techniques, the root canals volume after preparation was similar (p>0.05). The root canals filled by the continuous wave of condensation technique presented the lowest percentage of voids, and the greatest percentage of filling material in total length and thirds (cervical, middle and apical) (p<0.05). Both techniques were not able of completely filling the root canals. The continuous wave of condensation technique Termo Pack II promoted better root canal filling in curved root canals, when compared with lateral compaction.

Resumen El objetivo de este estudio fue comparar la capacidad de obturación en conductos radiculares curvos utilizando una nueva técnica de condensación de onda continua (Termo Pack II, Easy Dental Equipments, Brasil) vs compactación lateral. El porcentaje de brechas en la obturación de los conductos radiculares mesiales de los molares mandibulares se evaluó mediante microtomografía computarizada (micro-CT). Se prepararon conductos radiculares mesiales (n=24) de molares mandibulares con un grado de curvatura entre 20° y 40° utilizando un sistema rotatorio (ProDesign Logic, Easy, Brasil) al #35, conicidad 0,05. Los conductos radiculares se obturaron utilizando un sistema de condensación de onda contínua o compactación lateral y cemento AH Plus (n=12). Se realizó un escaneo de 9 µm después de la preparación y después de la obturación usando el micro-CT SkyScan 1176. Se calculó el porcentaje volumétrico de material de obturación y vacíos (longitud total y en cada tercio del conducto radicular). Los datos se analizaron utilizando las pruebas ANOVA/Tukey y t de Student (α=0,05). Antes de las técnicas de obturación, el volumen de los conductos radiculares después de la preparación fue similar (p>0,05). Los conductos radiculares obturados con la técnica de condensación por onda contínua presentaron el menor porcentaje de vacíos y el mayor porcentaje de material de obturación en longitud total y en tercios (cervical, medio y apical) (p<0,05). Ambas técnicas no fueron capaces de llenar completamente los conductos radiculares. La técnica de condensación de onda contínua Termo Pack II promovió un mejor relleno del conducto radicular en conductos radiculares curvos en comparación con la compactación lateral.

https://doi.org/10.15517/ijds.2023.54004

Perfil clínico-epidemiológico de pacientes con covid-19 hospitalizados en un hospital universitario de referencia
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de Sousa-de Lima, Bruna Daniella

; Fogaça-Rabito, Lucas Benedito

; Nishikawa-Yagi, Mara Cristina

; Giorio-Dutra-Kreling, Maria Clara

; Franco-da Rocha, Aline

; Eiko-Karino, Márcia

Enfermería Global

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2023, Volumen 22 Nº 70 Paginas 257 - 296

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

ABSTRACT: Objective: To characterize the epidemiological profile of patients hospitalized with COVID-19 in a referral emergency unit in northern Paraná; analyze the profile of patients affected by COVID-19 regarding gender, color/race, age, marital status, origin and type of referral; measure the average length of hospital stay, from the date of admission of the patient until discharge, determine the percentage of the main hospital outcomes. Method: It was field research with a quantitative, observational, unicentric, descriptive, exploratory and retrospective approach, carried out at the University Hospital of the State University of Londrina, located in the north of the Paraná. The study population consisted of data from 2,800 patients admitted and hospitalized with a confirmed diagnosis of COVID-19 in the Emergency Room of the hospital in question, according to records of the epidemiology center and Medical and Statistical Archive Service, from January 2021 to July 2021. Results: It was observed that most of those affected were male, had a white color, were single and were between 58 and 67 years old. The mean length of hospitalization was 16 days. The Mobile Emergency Care Service obtained the highest referral records and the discharge and death outcomes had very close values. Conclusion: It is concluded that the second wave of COVID-19 was devastating in all segments, reflecting the change in the age profile of those affected, the increase in hospitalization rates, high mortality rates and the close relationship between the hospitalization period and the evolution to death.

RESUMEN: Objetivo: Caracterizar el perfil epidemiológico de los pacientes hospitalizados con COVID-19 en una unidad de emergencia de referencia en el norte de Paraná; analizar el perfil de los pacientes afectados por COVID-19 en términos de: sexo, color/raza, edad, estado civil, procedencia y tipo de derivación; medir el promedio de estancia hospitalaria, desde la fecha de ingreso hasta el alta del paciente, determinar el porcentaje de los principales resultados hospitalarios. Método: Se trata de una investigación de campo con abordaje cuantitativo, observacional, unicéntrica, descriptiva, exploratoria y retrospectiva, realizada en el Hospital Universitario de la Universidad Estadual de Londrina, ubicado en el norte de Paraná. La población de estudio estuvo constituida por los datos de 2.800 pacientes ingresados y hospitalizados con diagnóstico confirmado de COVID-19 en el Servicio de Urgencias del hospital en cuestión, según registros del núcleo de epidemiología y el Servicio de Estadísticas y Archivo Médico, desde enero de 2021 hasta julio de 2021. de 2021. Resultados: Se observó que la mayoría de los afectados eran del sexo masculino, de raza blanca, solteros y tenían entre 58 y 67 años. La estancia hospitalaria media fue de 16 días. El Servicio Móvil de Atención de Urgencias presentó los mayores registros de derivaciones y los desenlaces de alta y muerte tuvieron valores muy similares. Conclusión: Se concluye que la segunda ola de COVID-19 fue devastadora en todos los seguimientos, reflejando el cambio en el perfil etario de los afectados, el aumento de las tasas de hospitalización, las altas tasas de mortalidad y la estrecha relación entre el período de hospitalización y progresión a la muerte.

RESUMO: Objetivo: Caracterizar o perfil epidemiológico dos pacientes internados com COVID-19 em uma unidade de pronto socorro referência do norte do Paraná; analisar o perfil dos pacientes acometidos por COVID-19 quanto ao: gênero, cor/raça, idade, estado civil, procedência e tipo de encaminhamento; mensurar o tempo médio de internação hospitalar, desde a data da admissão do paciente até sua alta, determinar o percentual dos principais desfechos hospitalares. Método: Tratou-se de uma pesquisa de campo com abordagem quantitativa, do tipo observacional, unicêntrica, descritiva, exploratória e retrospectiva, realizada no Hospital Universitário da Universidade Estadual de Londrina, localizado no norte do Paraná. A população do estudo consistiu dos dados de 2.800 pacientes admitidos e internados com diagnóstico confirmado de COVID-19 no Pronto Socorro do hospital em questão, conforme registros do núcleo de epidemiologia e Serviço de Arquivo Médico e Estatística, no período de janeiro de 2021 a julho de 2021. Resultados: Observou-se que maioria dos acometidos eram do sexo masculino, possuíam cor branca, eram solteiros e tinham entre 58 e 67 anos. O tempo médio de internação foi de 16 dias. O Serviço de Atendimento Móvel de Urgência obteve os maiores registros de encaminhamentos e os desfechos de alta e óbito possuíram valores muito próximos. Conclusão: Conclui-se que a segunda onda da COVID-19 se mostrou devastadora em todos os seguimentos, refletindo na mudança do perfil etário dos acometidos, no aumento das taxas de internação, nos altos índices de mortalidade e na a estreita relação entre o período de internação e a evolução ao óbito.

https://doi.org/10.6018/eglobal.544171

Use of longitudinal wave in non-destructive methods: approach to foundation and retaining elements nondestructive non destructive methods
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Silva, Isabela Grossi da

; Faro, Vítor Pereira

Soils and Rocks

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2023, Volumen 46 Nº 2 elocation e2023013222

Resumen: En | Texto: En | PDF: En

Abstract Non-destructive tests (NDT) are used to verify the length or integrity of elements embedded in soils or rocks. These elements can be piles in foundations or nails and tiebacks in retaining walls. NDTs differ by the types of waves, ways to generate and receive the signal and to analyze data. Tests using sonic wave do not require a pre-installed pipe or wire and they are based on acoustic impedance theory. Despite its dissemination on piles, the application in retaining elements is recent and requires more studies to increase knowledge about these methods. This paper aims to present studies of sonic wave methods in foundation and retaining elements, presenting results, similarities, and differences. Studies from different dates are presented with their relevance, considerations for the different types of elements tested, objectives and methodologies used, to evidence the variables involved within this solution. The sonic test in foundation is widespread and has a greater number of studies. Withing this paper, the variables that interfere in the results of these methods were observed: the velocity of propagation of the sonic wave, the soil stiffness, the location of wave generation and reception and the type of hammer used, evidencing the necessity of further studies, especially in retaining elements. Nondestructive Non destructive NDT (NDT rocks walls waves data preinstalled pre installed theory similarities differences relevance tested solution observed stiffness

https://doi.org/10.28927/sr.2023.013222

MAPEAMENTO DE ÍNDICE DE RISCO DE INUNDAÇÃO DE ÁREA A JUSANTE DE UMA BARRAGEM EM CASO DE ROMPIMENTO
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Alves Junior, F. M.

; Kobiyama, M.

; Corseuil, C.W

Mercator (Fortaleza)

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2023, Volumen 22 elocation e22004

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

Resumen El objetivo fue evaluar el índice de riesgo de inundación, debido a la hipotética ruptura de la represa de São Bento (SC). El índice de riesgo se obtuvo combinando los índices de peligrosidad y vulnerabilidad. El peligro se obtuvo multiplicando la velocidad por la profundidad del agua, simulada con HEC-RAS 2D. El punto de inundación simulado fue de 64,8 km², el caudal máximo fue de 3586,60 m³.s-1, profundidad de hasta 2,0 m y velocidad de hasta 2,0 m.s-1, en la mayor parte del área. La brecha se produjo en 2,85 h y el pico de flujo se produjo en 1h40 min. El volumen fugado en la ruptura fue de 44,75 hm³. La ola de inundación alcanzó 22,0 km de longitud donde se ubica el municipio de Forquilhinha. El mapa de índice de riesgo mostró que hasta 6 km de la represa el riesgo es alto, debido a que la mayoría de las personas tienen 60 años o más y son de bajos ingresos. En este lugar, las personas no están seguras dentro de los edificios, debido a que tienen una alta probabilidad de ser destruidos. Así, el mapeo de riesgos puede ser adoptado como medida preventiva, auxiliar en la elaboración de un plan de acción de emergencia, servir para la educación ambiental y la planificación territorial. SC. SC . (SC) vulnerabilidad agua HECRAS HEC RAS 2D D 648 64 8 64, km² 358660 3586 3586,6 m³.s1, m³s1 ms m³.s 1, m³ s 1 m³.s-1 20 2 0 2, m.s1, ms1 m.s m.s-1 área 285 85 2,8 1h4 min 4475 44 75 44,7 hm³ hm 220 22 22, Forquilhinha alto ingresos lugar edificios destruidos Así preventiva emergencia territorial (SC 35866 358 3586, s1 m³.s1 m³s m³.s- m.s1 m.s- 28 1h 447 4 7 44, 35 3

Abstract We aimed to evaluate the flood risk index due to the hypothetical break of the São Bento dam (SC, Brazil). The risk index was obtained by combining the hazard and vulnerability indices. The hazard index was obtained by multiplying the velocity by the depth of the water, simulated with HEC-RAS 2D. The simulated flood extent was 64.8 km², with a maximum flow of 3586.60 m³·s-1, a depth of up to 2.0 m, and a velocity of up to 2.0 m·s-1 in most of the area. The formation of the breach occurred in 2.85 h, and the peak flow occurred at 1.67 h. The volume that overflowed with the break was 44.75 hm³. The flood wave reached 22.0 km in length, where the municipality of Forquilhinha is located. The risk index map showed that the risk is high up to 6 km from the dam since most people were at least 60 years old and had low incomes. In this location, the people were not safe inside buildings because they had a high probability of being destroyed. Thus, risk mapping may be adopted as a preventive measure to assist in preparing an emergency action plan and serve for environmental education and territorial planning. SC, SC (SC Brazil. Brazil . Brazil) indices water HECRAS HEC RAS 2D D 648 64 8 64. km² 358660 3586 3586.6 m³·s1, m³s1 ms m³·s 1, m³ s 1 m m³·s-1 20 2 0 2. m·s1 ms1 m·s m·s- area 285 85 2.8 h 167 67 1.6 4475 44 75 44.7 hm³ hm 220 22 22. length located incomes location destroyed Thus planning 35866 358 3586. s1 m³·s1 m³s m³·s- 28 16 1. 447 4 7 44. 35 3

Resumo Objetivou-se avaliar o índice de risco de inundação, devido ao rompimento hipotético da barragem de São Bento (SC). O índice de risco foi obtido combinando os índices de perigo e de vulnerabilidade. O perigo obteve-se multiplicando a velocidade pela profundidade da água, simuladas com HEC-RAS 2D. A mancha de inundação simulada foi de 64,8 km², a vazão máxima de 3586,60 m³.s-1, profundidade de até 2,0 m e velocidade de até 2,0 m.s-1, na maior parte da área. A formação da brecha aconteceu em 2,85 h e o pico de vazão ocorreu em 1h40 min. O volume extravasado no rompimento foi de 44,75 hm³. A onda de cheia atingiu 22,0 km de extensão onde fica o município de Forquilhinha. O mapa de índice de risco mostrou que até 6 km da barragem o risco é alto, devido a maioria das pessoas terem 60 anos ou mais e serem de baixa renda. Nesse local, as pessoas não estão seguras dentro das edificações, porque têm alta probabilidade de serem destruídas. Assim, o mapeamento de risco pode ser adotado como medida de prevenção, auxiliar na elaboração de um plano de ação emergencial, servir para educação ambiental e para o planejamento territorial. Objetivouse Objetivou se SC. SC . (SC) vulnerabilidade obtevese obteve água HECRAS HEC RAS 2D D 648 64 8 64, km² 358660 3586 3586,6 m³.s1, m³s1 ms m³.s 1, m³ s 1 m³.s-1 20 2 0 2, m.s1, ms1 m.s m.s-1 área 285 85 2,8 1h4 min 4475 44 75 44,7 hm³ hm 220 22 22, Forquilhinha alto renda local edificações destruídas Assim prevenção emergencial territorial (SC 35866 358 3586, s1 m³.s1 m³s m³.s- m.s1 m.s- 28 1h 447 4 7 44, 35 3

https://doi.org/10.4215/rm2023.e22004

10.

A rapid identification method of rice protein in rice starch based on synchronous fluorescence spectroscopy
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ZHANG, Weiwei

; LIU, Kaiqi

; LV, Riqin

; WAN, Tong

; ZHOU, Shenao

; SUN, Yanhui

; GU, Haiyang

Food Science and Technology

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2023, Volumen 43 elocation e91122

Resumen: En | Texto: En | PDF: En

Abstract Rice protein is a protein with high nutritional value and its essential amino acids are complete. Rice protein content is related to the Nutritional value of rice powder mixture. Three-dimensional synchronous fluorescence spectroscopy combined with Parallel factor analysis (PARAFAC) and Partial least squares (PLS) was applied for Protein content in rice starch. Synchronous Fluorescence Spectroscopy were obtained at 250-400 nm (excitation) and 260-750 nm (wave-length deviation). Firstly, data of Rice starch were collected using synchronous fluorescence spectroscopy equipment and the protein content of samples were got by Dumas Nitrogen analyzer ; secondly, three improved PLS methods, including interval partial least squares (iPLS), backward interval partial least squares (biPLS) and synergy interval partial least squares (siPLS),were used to find the most informative range. Lastly, models with better predictive turbidity of fragrance vinegar using PLS was established in the whole wavelength range .The results showed that the models by siPLS method, which separated the whole spectra into 10 intervals, and combine four intervals of [1 3 4 5]had the best predictive ability, the RMSECV and RMSEP were 0.1482 and 0.1696, and the calibration and prediction correlation coefficient were 0.8513 and 0.8236. Using three-dimensional synchronous fluorescence spectroscopy for rapid detection of Protein content in rice starch was feasible. complete mixture Threedimensional Three dimensional PARAFAC (PARAFAC (PLS 250400 250 400 250-40 excitation (excitation 260750 260 750 260-75 wave length deviation. deviation . deviation) Firstly secondly methods iPLS, iPLS , (iPLS) biPLS (biPLS siPLS,were siPLSwere ,were Lastly The method 1 [ 5had had 5 ability 01482 0 1482 0.148 01696 1696 0.1696 08513 8513 0.851 08236 8236 0.8236 threedimensional feasible 25040 25 40 250-4 26075 26 75 260-7 (iPLS 0148 148 0.14 0169 169 0.169 0851 851 0.85 0823 823 0.823 2504 2 250- 2607 7 260- 014 14 0.1 016 16 0.16 085 85 0.8 082 82 0.82 01 0. 08 8

https://doi.org/10.1590/fst.91122

11.

Ductus venosus as a marker of fetal growth in first trimester in a population of Colombian pregnant women
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Martínez Ramírez, Mauricio Andrés

; Gamboa, Valentina María Vargas

; Infante, Ximena Carolina Romero

; Calvo, Montserrat Uriel

; Hernández, Arlín Martha Bibiana Pérez

Revista Brasileira de Saúde Materno Infantil

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2023, Volumen 23 elocation e20210293

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

Abstract Objectives: to evaluate the relationship between the ductus venosus (DV) and the variables of fetal growth in the first trimester in a Colombian pregnant population. Methods: a descriptive cross-sectional study was carried out with secondary data obtained from a multicenter study.526 patients were included between weeks 11 and 14 for gestational ultrasound follow-up attended in three health care institutions in Bogotá, Colombia, between May 2014 and October 2018. A bivariate descriptive analysis was carried out where the relationship between the characteristics of the DV in the first trimester and ultrasound findings. Results: the flow wave of the DV in the first trimester was normal in the entire sample, with a pulsatility index of the ductus venosus (DVPI) of 0.96±0.18. In addition, a negative correlation was found between the crown-rump length (CRL) and the DVPI (p<0.05). Conclusion: there is a relationship between the DVPI regarding the CRL, indicating an interest in this early marker in relation to fetal growth alterations; however, more studies are required to determine the usefulness of this variable with respect to fetal growth. Objectives (DV population Methods crosssectional cross sectional study526 526 study.52 1 followup follow up Bogotá Colombia 201 2018 findings Results sample (DVPI 096018 0 96 18 0.96±0.18 addition crownrump crown rump CRL (CRL p<0.05. p005 p p<0.05 . 05 (p<0.05) Conclusion alterations however study52 52 study.5 20 09601 9 0.96±0.1 p00 p<0.0 (p<0.05 study5 5 study. 2 0960 0.96±0. p0 p<0. (p<0.0 096 0.96±0 p<0 (p<0. 09 0.96± p< (p<0 0.96 (p< 0.9 (p 0.

Resumen Objetivos: evaluar la relación entre el ductus venoso (DV) y las variables del crecimiento fetal en primer trimestre en una población de gestantes colombianas. Métodos: se realizó un estudio transversal descriptivo con datos secundarios obtenidos de un estudio multicéntrico. Se incluyeron 526 pacientes entre las semanas 11 a 14 para seguimiento ecográfico gestacional atendidas en tres instituciones prestadoras de salud en Bogotá, Colombia, entre mayo del 2014 y octubre del 2018. Se realizó un análisis descriptivo bivariado donde se evaluó la relación entre las características del DV en primer trimestre y los hallazgos ecográficos. Resultados: la onda de flujo del DV en primer trimestre fue normal en la totalidad de la muestra, con un índice medio de pulsatilidad del ductus venoso (IPDV) de 0,96±0.18. Se encontró una correlación negativa entre la longitud cefalocaudal (LCC) y el IPDV (p<0.05). Conclusión: existe una relación entre el IPDV respecto a la LCC, señalando un interés de este marcador temprano en relación con las alteraciones del crecimiento fetal, sin embargo, se requieren más estudios para determinar la utilidad entre esta variable respecto al crecimiento fetal Objetivos (DV colombianas Métodos multicéntrico 52 1 Bogotá Colombia 201 2018 ecográficos Resultados muestra (IPDV 096018 0 96 18 0,96±0.18 LCC (LCC p<0.05. p005 p p<0.05 . 05 (p<0.05) Conclusión embargo 5 20 09601 9 0,96±0.1 p00 p<0.0 (p<0.05 2 0960 0,96±0. p0 p<0. (p<0.0 096 0,96±0 p<0 (p<0. 09 0,96± p< (p<0 0,96 (p< 0,9 (p 0,

https://doi.org/10.1590/1806-9304202300000293-en

12.

Factors associated with COVID-19 length of hospitalization and mortality during four epidemic waves, March 2020–November 2021, Suriname
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Gokoel, Anisma R.

; Jairam, Maniesha

; Mendeszoon, Angele

; Liauw Kie Fa, Lindy

; Poese, Fauzia

; Jarbanha, Ameerani

; Jairam, Vanita

; Abdoel Wahid, Firoz

Revista Panamericana de Salud Pública

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2023, Volumen 47 elocation e100

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

RESUMO Objetivo. Determinar os fatores de risco sociodemográficos associados à mortalidade por doença pelo coronavírus 2019 (COVID-19) no Suriname. Métodos. Este foi um estudo de coorte retrospectivo. Foram incluídos todos os óbitos por COVID-19 registrados no Suriname (n=1112) entre 13 de março de 2020 e 11 de novembro de 2021. Os dados foram coletados de registros médicos e incluíram variáveis demográficas e a duração da internação dos pacientes que morreram. Estatísticas descritivas, testes de qui-quadrado, modelos de ANOVA e análises de regressão logística foram usados para determinar associações entre variáveis sociodemográficas, a duração da internação e a mortalidade durante quatro ondas epidêmicas. Resultados. A taxa de letalidade durante o período do estudo foi de 22 por 1 000 habitantes. A primeira onda epidêmica ocorreu de julho a agosto de 2020, a segunda, de dezembro de 2020 a janeiro de 2021, a terceira, de maio a junho de 2021 e a quarta, de agosto a setembro de 2021. Foram encontradas diferenças significativas no número de mortes e na duração da internação entre as ondas (p<0,001). Os pacientes tinham maior probabilidade de ter uma internação mais longa na primeira (razão de chances [RC]: 1,66; intervalo de confiança (IC 95%): 0,98–2,82) e na terceira onda (RC: 2,37; IC 95%: 1,71–3,28) em comparação com a quarta. Também foram observadas diferenças significativas entre etnias na mortalidade por onda (p=0,010). Em comparação com o grupo misto e outros, as pessoas de etnia crioula (RC: 2,7; IC 95%: 1,33–5,29) e tribal (RC: 2,8; IC 95%: 1,12–7,02) tinham maior probabilidade de morrer na quarta onda do que na terceira onda. Conclusões. São necessárias intervenções adaptadas para homens, pessoas de descendência crioula, povos tribais e indígenas e pessoas com mais de 65 anos.

RESUMEN Objetivo. Determinar los factores de riesgo sociodemográficos asociados a la mortalidad por la enfermedad por el coronavirus del 2019 (COVID-19) en Suriname. Métodos. Este fue un estudio de cohortes retrospectivo. Se analizaron todas las muertes por COVID-19 registradas en Suriname (n=1112) entre el 13 de marzo del 2020 y el 11 de noviembre del 2021. Los datos se recopilaron a partir de los expedientes médicos, e incluyeron las variables demográficas y la duración de la hospitalización de los pacientes fallecidos. Se utilizaron métodos estadísticos descriptivos, la prueba de la ji al cuadrado, modelos de análisis de la varianza y análisis de regresión logística para determinar las asociaciones entre las variables sociodemográficas, la duración de la hospitalización y la mortalidad durante cuatro oleadas epidémicas. Resultados. La tasa de letalidad en el período del estudio fue de 22 por cada 1 000 habitantes. La primera oleada epidémica fue de julio a agosto del 2020; la segunda, de diciembre del 2020 a enero del 2021; la tercera, de mayo a junio del 2021; y la cuarta, de agosto a septiembre del 2021. Se observaron diferencias significativas en el número de muertes y la duración de la hospitalización entre las oleadas (p<0,001). Fue más probable que los pacientes tuvieran una hospitalización más prolongada durante la primera oleada (razón de posibilidades [odds ratio, OR] 1,66; IC del 95%: 0,98, 2,82) y la tercera (OR 2,37; IC del 95%: 1,71, 3,28) en comparación con la cuarta. También se observaron diferencias significativas en la mortalidad entre etnias según la oleada (p=0,010). En comparación con el grupo poblacional de origen mixto y de otro origen, las personas de la etnia criolla (OR 2,7; IC del 95%: 1,33, 5,29) y de origen tribal (OR 2,8; IC del 95%: 1,12, 7,02) tuvieron una mayor probabilidad de fallecer durante la cuarta oleada que durante la tercera. Conclusiones. Es preciso llevar a cabo intervenciones diseñadas específicamente para los hombres, las personas de ascendencia criolla, los pueblos tribales e indígenas y las personas mayores de 65 años.

ABSTRACT Objectives. To determine the sociodemographic risk factors associated with coronavirus disease 2019 (COVID-19) mortality in Suriname. Methods. This was a retrospective cohort study. All registered deaths from COVID-19 in Suriname (n=1112) between March 13, 2020 and November 11, 2021 were included. Data were collected from medical records and included demographic variables and hospitalization duration of patients who died. Descriptive statistics, chi-squared tests, ANOVA models, and logistic regression analyses were used to determine associations between sociodemographic variables, length of hospitalization, and mortality during four epidemic waves. Results. The case fatality rate over the study period was 22 per 1 000 population. The first epidemic wave was from July to August 2020, the second from December 2020 to January 2021, the third from May to June 2021, and the fourth from August to September 2021. Significant differences were found in the number of deaths and hospitalization duration by wave (p<0.001). Patients were more likely to have a longer hospitalization during the first (OR 1.66; 95% CI: 0.98, 2.82) and third waves (OR 2.37; 95% CI: 1.71, 3.28) compared with the fourth wave. Significant differences in mortality were also seen between ethnicities by wave (p=0.010). Compared with the mixed and other group, people of Creole ethnicity (OR 2.7; 95% CI: 1.33, 5.29) and Tribal people (OR 2.8; 95% CI: 1.12, 7.02) were more likely to die during the fourth wave than the third wave. Conclusions. Tailored interventions are needed for males, people of Creole descent, Tribal and Indigenous peoples, and people older than 65 years.

https://doi.org/10.26633/rpsp.2023.100

13.

Scattering length and effective range of microscopic two-body potentials twobody two body
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Macêdo-Lima, Mathias

; Madeira, Lucas

Revista Brasileira de Ensino de Física

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2023, Volumen 45 elocation e20230079

Resumen: En | Texto: En | PDF: En

Scattering processes are a fundamental way of experimentally probing distributions and properties of systems in several areas of physics. Considering two-body scattering at low energies, when the de Broglie wavelength is larger than the range of the potential, partial waves with high angular momentum are typically unimportant. The dominant contribution comes from l = 0 partial waves, commonly known as s-wave scattering. This situation is very relevant in atomic physics, e.g. cold atomic gases, and nuclear physics, e.g. nuclear structure and matter. This manuscript is intended as a pedagogical introduction to the topic while covering a numerical approach to compute the desired quantities. We introduce low-energy scattering with particular attention to the concepts of scattering length and effective range. These two quantities appear in the effective-range approximation, which universally describes low-energy processes. We outline a numerical procedure for calculating the scattering length and effective range of spherically symmetric two-body potentials. As examples, we apply the method to the spherical well, modified Pöschl-Teller, Gaussian, and Lennard-Jones potentials. We hope to provide the tools so students can implement similar calculations and extend them to other potentials. physics twobody body energies potential unimportant swave s wave eg e g e.g gases matter lowenergy energy effectiverange approximation potentials examples well PöschlTeller, PöschlTeller Pöschl Teller, Teller Pöschl-Teller Gaussian LennardJones Lennard Jones

https://doi.org/10.1590/1806-9126-rbef-2023-0079

14.

O que mudou entre os períodos de pico e de platô durante a primeira onda do SARS-CoV-2? Estudo multicêntrico português em unidades de cuidados intensivos SARSCoV2 SARSCoV SARS CoV 2 SARS-CoV-2 SARS-CoV- SARS-CoV
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Pereira, Rui Antunes

; Sousa, Marta

; Cidade, José Pedro

; Melo, Luís

; Lopes, Diogo

; Ventura, Sara

; Aragão, Irene

; Lima Neto, Raul Miguel de Freitas

; Molinos, Elena

; Marques, Ana

; Cardoso, Nelson

; Marino, Flávio

; Monteiro, Filipa Brás

; Oliveira, Ana Pinho

; Silva, Rogério C

; Real, André Miguel Neto

; Banheiro, Bruno Sarmento

; Reis, Renato

; Adão-Serrano, Maria

; Cracium, Ana

; Valadas, Ana

; Ribeiro, João Miguel

; Póvoa, Pedro

; Tapadinhas, Camila

; Mendes, Vítor

; Coelho, Luís

; Maia, Raquel

; Freitas, Paulo Telles

; Ferreira, Isabel Amorim

; Ramires, Tiago

; Val-Flores, Luís Silva

; Cascão, Mariana

; Alves, Rita

; Rodeia, Simão C

; Barrigoto, Cleide

; Cardiga, Rosa

; Silva, Maria João Ferreira da

; Vale, Bruno

; Fonseca, Tatiana

; Rios, Ana Lúcia

; Camões, João

; Pérez, Danay

; Cabral, Susana

; Ribeiro, Maria Inês

; Mendes, João João

; Gouveia, João

; Fernandes, Susana Mendes

Revista Brasileira de Terapia Intensiva

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Dic 2022, Volumen 34 Nº 4 Paginas 433 - 442

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

ABSTRACT Objective: To analyze and compare COVID-19 patient characteristics, clinical management and outcomes between the peak and plateau periods of the first pandemic wave in Portugal. Methods: This was a multicentric ambispective cohort study including consecutive severe COVID-19 patients between March and August 2020 from 16 Portuguese intensive care units. The peak and plateau periods, respectively, weeks 10 - 16 and 17 - 34, were defined. Results: Five hundred forty-one adult patients with a median age of 65 [57 - 74] years, mostly male (71.2%), were included. There were no significant differences in median age (p = 0.3), Simplified Acute Physiology Score II (40 versus 39; p = 0.8), partial arterial oxygen pressure/fraction of inspired oxygen ratio (139 versus 136; p = 0.6), antibiotic therapy (57% versus 64%; p = 0.2) at admission, or 28-day mortality (24.4% versus 22.8%; p = 0.7) between the peak and plateau periods. During the peak period, patients had fewer comorbidities (1 [0 - 3] versus 2 [0 - 5]; p = 0.002) and presented a higher use of vasopressors (47% versus 36%; p < 0.001) and invasive mechanical ventilation (58.1 versus 49.2%; p < 0.001) at admission, prone positioning (45% versus 36%; p = 0.04), and hydroxychloroquine (59% versus 10%; p < 0.001) and lopinavir/ritonavir (41% versus 10%; p < 0.001) prescriptions. However, a greater use of high-flow nasal cannulas (5% versus 16%, p < 0.001) on admission, remdesivir (0.3% versus 15%; p < 0.001) and corticosteroid (29% versus 52%, p < 0.001) therapy, and a shorter ICU length of stay (12 days versus 8, p < 0.001) were observed during the plateau. Conclusion: There were significant changes in patient comorbidities, intensive care unit therapies and length of stay between the peak and plateau periods of the first COVID-19 wave. Objective COVID19 COVID 19 COVID-1 characteristics Portugal Methods 202 1 units respectively 34 defined Results fortyone forty one 6 57 [5 74 years 71.2%, 712 71.2% , 71 (71.2%) included 0.3, 03 0.3 0 3 0.3) 40 (4 39 0.8, 08 0.8 8 0.8) pressurefraction pressure fraction 139 (13 136 0.6, 06 0.6 0.6) 57% (57 64% 64 0.2 02 admission 28day day 28 24.4% 244 24 4 (24.4 22.8% 228 22 0.7 07 7 period ( [ 5 5] 0.002 0002 002 47% 47 (47 36% 36 0.001 0001 001 58.1 581 58 (58. 49.2% 492 49 45% 45 (45 0.04, 004 0.04 04 0.04) 59% 59 (59 10% lopinavirritonavir lopinavir ritonavir 41% 41 (41 prescriptions However highflow high flow 5% (5 16% 0.3% (0.3 15% 15 29% 29 (29 52 52% 12 Conclusion COVID1 COVID- 20 71.2 (71.2% 0. 13 24.4 (24. 22.8 0.00 000 00 58. (58 49.2 0.0 (0. (2 71. (71.2 24. (24 22. 49. (0 (71. (71 (7

RESUMO Objetivo: Analisar e comparar as características de pacientes críticos com a COVID-19, a abordagem clínica e os resultados entre os períodos de pico e de platô na primeira onda pandêmica em Portugal. Métodos: Este foi um estudo de coorte multicêntrico ambispectivo, que incluiu pacientes consecutivos com a forma grave da COVID-19 entre março e agosto de 2020 de 16 unidades de terapia intensiva portuguesas. Definiram-se as semanas 10 - 16 e 17 - 34 como os períodos de pico e platô. Resultados: Incluíram-se 541 pacientes adultos com mediana de idade de 65 [57 - 74] anos, a maioria do sexo masculino (71,2%). Não houve diferenças significativas na mediana de idade (p = 0,3), no Simplified Acute Physiology Score II (40 versus 39; p = 0,8), na pressão parcial de oxigênio/fração inspirada de oxigênio (139 versus 136; p = 0,6), na terapia com antibióticos na admissão (57% versus 64%; p = 0,2) ou na mortalidade aos 28 dias (24,4% versus 22,8%; p = 0,7) entre o período de pico e platô. Durante o período de pico, os pacientes tiveram menos comorbidades (1 [0 - 3] versus 2 [0 - 5]; p = 0,002); fizeram mais uso de vasopressores (47% versus 36%; p < 0,001) e ventilação mecânica invasiva na admissão (58,1% versus 49,2%; p < 0,001), e tiveram mais prescrição de hidroxicloroquina (59% versus 10%; p < 0,001), lopinavir/ritonavir (41% versus 10%; p < 0,001) e posição prona (45% versus 36%; p = 0,04). Entretanto, durante o platô, observou-se maior uso de cânulas nasais de alto fluxo (5% versus 16%; p < 0,001) na admissão, remdesivir (0,3% versus 15%; p < 0,001) e corticosteroides (29% versus 52%; p < 0,001), além de menor tempo de internação na unidade de terapia intensiva (12 versus 8 dias; p < 0,001). Conclusão: Houve mudanças significativas nas comorbidades dos pacientes, nos tratamentos da unidade de terapia intensiva e no tempo de internação entre os períodos de pico e platô na primeira onda da COVID-19. Objetivo COVID19, COVID19 COVID 19, 19 Portugal Métodos ambispectivo COVID-1 202 1 portuguesas Definiramse Definiram se 3 Resultados Incluíramse Incluíram 54 6 57 [5 74 anos 71,2%. 712 71,2% . 71 (71,2%) 0,3, 03 0,3 , 0 0,3) 40 (4 39 0,8, 08 0,8 0,8) oxigêniofração fração 139 (13 136 0,6, 06 0,6 0,6) 57% (57 64% 64 0,2 02 24,4% 244 24 4 (24,4 22,8% 228 22 0,7 07 7 ( [ 5 5] 0,002 0002 002 0,002) 47% 47 (47 36% 36 0,001 0001 001 58,1% 581 58 (58,1 49,2% 492 49 0,001, 59% 59 (59 10% lopinavirritonavir lopinavir ritonavir 41% 41 (41 45% 45 (45 0,04. 004 0,04 04 0,04) Entretanto observouse observou 5% (5 16% 0,3% (0,3 15% 15 29% 29 (29 52% 52 12 0,001. Conclusão COVID19. 19. COVID1 COVID- 20 71,2 (71,2% 0, 13 24,4 (24, 22,8 0,00 000 00 58,1 (58, 49,2 0,0 (0, (2 71, (71,2 24, (24 22, 58, (58 49, (0 (71, (71 (7

https://doi.org/10.5935/0103-507x.20210037-pt

15.

Diatomic molecules and fermionic particles with improved Hellmann-generalized Morse potential through the solutions of the deformed Klein-Gordon, Dirac and Schrödinger equations in extended relativistic quantum mechanics and extended nonrelativistic quantum mechanics symmetries
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Maireche, A.

Revista mexicana de física

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Abr 2022, Volumen 68 Nº 2 elocation e020801

Resumen: En | Texto: En | PDF: En

Abstract In this paper, we investigate the new approximate bound state solution of deformed Klein-Gordon, Dirac and Schrödinger equations in the symmetries of extended relativistic quantum mechanics ERQM and extended nonrelativistic quantum mechanics ENRQM have been obtained with a newly proposed potential called improved Hellmann-generalized Morse potential (IHGMP, for short). To the best of our knowledge, this problem is examined in literature in the usual RQM and NRQM with Hellmann-generalized Morse potential. The potential is a superposition of Hellmann potential, generalized Morse or Deng-Fan potential, and some other exponential terms. By employing the improved approximation to deal with the centrifugal term, Bopp’s shift and standard perturbation theory method. The new approximate analytical energy shift and the corrections of bound state energy eigenvalues in ERQM and ENRQM are obtained for some selected diatomic molecules such as (HCl, LiH, H2, ScH, TiH, VH, CrH, CuLi, TiC, NiC, ScN and ScF). The new values that we get are sensitive to the quantum numbers (j,l,s,m), the potential depths of the improved Hellmann-generalized Morse potential (α,b), the range of the potential α, the dissociation energy D e , the equilibrium bond length r e , and noncommutativity parameters(Θ,σ,χ). We have highlighted three physical phenomena that automatically generate a result of the topological properties of noncommutativity, the first physical phenomena are the perturbative spin-orbit coupling, the second the magnetic induction while the third corresponds to the rotational proper phenomena. In both relativistic and nonrelativistic problems, we show that the corrections on the spectrum energy are smaller than the main energy in the ordinary cases of quantum field theory and quantum mechanics. In the new symmetries of NCQM, it is not possible to get the exact analytical solutions for l = 0 and l ≠ 0, the approximate solutions are available. Four special cases, i.e., l wave are investigated in the context of deformed Klein-Gordon and Schrödinger theories. The relativistic energy equations and the new nonrelativistic energy for some potentials such as improved Hellmann potential and improved generalized Morse potential have also been obtained by varying some potential parameters. We have clearly shown that the Schrödinger and Klein Gordon equations in the new symmetries can physically describe each of the two Dirac equations and the Duffin-Kemmer equation under the effect of IHGMP.

https://doi.org/10.31349/revmexfis.68.020801

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