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Exploring the electromechanical response and electric field-induced dielectric anomalies in PMN-PT electroceramics

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journal of Advanced Dielectrics 2021年第3期11卷 32-38页

作者： j.D.S.Guerra C.A.Guarany E.C.Lima E.B.Araújo j.E.Garcia Grupo de Ferroelétricos e Materiais Multifuncionais Instituto de Física Universidade Federal de Uberlandia UberlandiaMinas Gerais 38408-100Brazil Universidade Federal do Tocantins Porto Nacional Tocantins 77500-000Brazil Departamento de Física e Química Universidade Estadual Paulista Ilha Solteira–Sao Paulo 15385-000Brazil Department of Physics Universitat Politècnica de Catalunya–BarcelonaTech Barcelona 08034Spain

Electromechanical and dielectric properties of PMN-PT ferroelectric ceramics are *** particular,dielectric response studies focus on the investigation of the influence of the DC applied electric field on the dielectric permittivity as a function of temperature and *** reveal an electric field driven dielectric anomaly in the dielectric permittivity curves,e(E),which in turn prevails in the whole ferroelectric phase region and continuously vanishes for temperatures near the paraelectric-ferroelectric phase transition temperature.A schematic model for the domains dynamics of the studied material is proposed taking into account the simultaneous contribution of both 90°and 180°domains walls.

关键词： Ferroelectrics PMN-PT domain-walls dielectric response electric field

Fabrication of perovskite solar cell with high short-circuit current density(jsc)using moth-eye structure of SiOx

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Nano Research 2020年第4期13卷 1156-1161页

作者： Sucheol ju Minseop Byun Minjin Kim junho jun Daihong Huh Dong Suk Kim Yimhyun jo Heon Lee Department of Materials Science and Engineering Korea UniversityAnam-ro 145Sungbuk-GuSeoul 136-701Republic of Korea KIER-UNIST Advanced Center for Energy Korea Institute of Energy Research(KIER)UNIST-Gil 50Eonyang-eupUlju-gunUlsan 689-851Republic of Korea

The performance of solar cells is determined by three factors:the open-circuit voltage(Voc),short-circuit current density(jsc),and fill factor(FF).The Voc and FF are determined by the material bandgap and the series/shunt resistance,***,jsc is determined by the amount of incident light in addition to the bandgap of the *** this study,a moth-eye pattern was formed on a glass surface via direct printing to increase the amount of incident light and thus increase jsc-The moth-eye pattern is a typical antireflection pattern that reduces the reflection by gradually increasing the refractive index.A flat perovskite solar cell(F-PSC)and a moth-eye patterned perovskite solar cell(M-PSC)had jsc values of 23.70 and 25.50 mA/cm^2,*** power-conversion efficiencies of the F-PSC and M-PSC were 19.81%and 21.77%,respectively.

关键词： perovskite solar cells direct printing moth-eye pattern hydrogen silsesquioxane

Rat cardiomyocyte H9c2(2-1)-based sulforhodamine B assay as a promising in vitro method to assess the biological component of effluent toxicity

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journal of Environmental Sciences 2020年第10期32卷 163-170页

作者： Elsa T Rodrigues Susana F Nascimento Maria joao Moreno Paulo j Oliveira Miguel A Pardal University of Coimbra Centre for Functional EcologyDepartment of Life SciencesCalcada Martim de FreitasCoimbra 3000-456Portugal University of Coimbra Coimbra Chemistry CenterDepartment of ChemistryCoimbra 3004-535Portugal Centre for Neuroscience and Cell Biology Uniuersity of CoimbraUC BiotechBiocant ParkCantanhede 3060-197Portugal

The treatment of wastewaters is crucial to maintain the ecological status of receiving waters,and thereby guarantee the protection of aquatic life and human *** quality evaluation is conventionally based on physicochemical parameters,but increasing attention has been paid to integrate physicochemical and biological ***,the regulatory use of fish in biological testing methods has been subject to various ethical and cost concerns,and in vitro cell-based assays have thus become an important topic of ***,the present study intends:(a) to evaluate the efficiency of two different sample pre-concentration techniques (lyophilisation and solid phase extraction) to assess the toxicity of municipal effluents on rat cardiomyoblast H9c2(2-1) cells,and (b) maximizing the use of the effluent sample collected,to estimate the environmental condition of the receiving *** gathered results demonstrate that the H9c2(2-1) sulforhodamine B-based assay is an appropriate in vitro method to assess biological effluent toxicity,and the best results were attained by lyophilising the sample as *** to its response,the H9c2(2-1) cell line might be a possible alternative in vitro model for fish lethal testing to assess the toxicity of municipal *** physicochemical status of the sample suggests a high potential for eutrophication,and iron exceeded the permissible level for wastewater discharge,possibly due to the addition of ferric chloride for wastewater *** general,the levels of carbamazepine and sulfamethoxazole are higher than those reported for other countries,and both surpassed the aquatic protective values for long-term exposure.

关键词： Municipal wastewater treatment plant effluent Lyophilisation Solid phase extraction Cell-based assays H9c2(2-1)cell line SRB assay

Epidemiological and clinical characteristics of COVID-19 in a Brazilian public hospital

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World journal of Clinical Cases 2023年第8期11卷 1761-1770页

作者： Fillipe Dantas Pinheiro Luana Weber Lopes Rafael Santos Dantas Miranda Dórea Glauber Rocha Lima Araújo Filipe Antônio França da Silva Breno Bittencourt de Brito Maria Luísa Cordeiro Santos Geovani Moreno Santos júnior Maria Teresa Araújo de Lorenzo Barcia Renata de Amorim Marques AndréBezerra Botelho Anna Carolina Saúde Dantas Davi Tanajura Costa Adriano Fernandes Teixeira Cláudio Lima Souza Lucas Miranda Marques Guilherme Barretos Campos Márcio Vasconcelos Oliveira Dulciene Maria de Magalhães Queiroz Fabrício Freire de Melo Instituto Multidisciplinar em Saúde Universidade Federal da BahiaVitória da Conquista 45029-094BahiaBrazil Hospital Geral de Vitória da Conquista Vitória da Conquista 45030-160BahiaBrazil Departamento de Ciências da Saúde Universidade Estadual do Sudoeste da Bahia(UESB)Vitória da Conquista 45083-900BahiaBrazil Faculdade de Medicina Universidade Federal de Minas GeraisBelo Horizonte 31270-901Minas GeraisBrazil

BACKGROUND The coronavirus disease 2019(COVID-19)pandemic has become a major health concern *** that context,the understanding of epidemiological and clinical features associated with the disease and its severity is crucial for the establishment of strategies aimed at disease control and *** To describe epidemiological features,signs,symptoms,and laboratory findings among severely ill COVID-19 patients from an inten-sive care unit in northeastern Brazil as well as to evaluate predictor factors for disease *** This is a prospective single-center study that evaluated 115 patients admitted to the intensive care unit in a northeastern Brazilian *** The patients had a median age of 65.60±15.78 *** was the most frequent symptom,affecting 73.9%of the patients,followed by cough(54.7%).Fever was reported in approximately one-third of patients and myalgia in 20.8%of the *** least two comorbidities were found in 41.7%of the patients,and hypertension was the most prevalent(57.3%).In addition,having two or more comorbidities was a predictor of mortality,and lower platelet count was positively associated with *** and vomiting were two symptoms that were predictors of death,and the presence of a cough was a protective *** This is the first report of a negative correlation between cough and death in severely ill severe acute respiratory syndrome coronavirus 2-infected *** associations between comorbidities,advanced age,and low platelet count and the outcomes of the infection were similar to the results of previous studies,highlighting the relevance of these features.

关键词： COVID-19 Epidemiology Symptoms Comorbidities Laboratory parameters

Sensor-based physical activity, sedentary time, and reported cell phone screen time: A hierarchy of correlates in youth

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journal of Sport and Health Science 2021年第1期10卷 55-64页

作者： Pedro B.júdice joão P.Magalhães Gil B.Rosa Duarte Henriques-Neto Megan Hetherington-Rauth Luís B.Sardinha Exercise and Health Laboratory CIPERFaculty of Human KineticsUniversity of LisbonLisbon 1499-002Portugal Faculty of Physical Education and Sport Lusofona UniversityLisbon 1749-024Portugal

Background:Evidence on correlates relies on subjective metrics and fails to include correlates across all levels of the ecologic *** determined which correlates best predict sensor-based physical activity(PA),sedentary time(ST),and self-reported cell phone screen time(CST)in a large sample of youth,while considering a multiplicity of ***:Using sensor-based accelerometry,we assessed the PA and ST of 2179 youths.A χ^2 automatic interaction detection algorithm was used to hierarchize the correlates associated with too much ST(>50th percentile),insufficient moderate-to-vigorous PA(MVPA)(<60 min/day),and prolonged CST(≥2 h/day).Results:Among youth 10-14 years old,the correlates for being inactive consisted of being a girl,not having sport facilities in the neighborhood,and not perceiving the neighborhood as a safe place,whereas in the youth 15-18 years old,the correlate for being inactive was not performing sports(9.7%chance of being active).The correlates for predicting high ST in the younger group was not performing sports(55.8%chance for high ST),and in the older group,the correlates were not owning a pet,perceiving the neighborhood as safe,and having inactive parents(63.7%chance for high ST).In the younger group,the greatest chances of having high CST were among those who were in the last elementary school years,who were girls,and who did not have friends in the neighborhood(73.1%chance for high CST),whereas in the older group,the greatest chance for having high CST was among those who were girls and had a TV in the bedroom(74.3%chance for high CST).Conclusion:To counteract ST and boost MVPA among youths,a specific focus on girls,the promotion of sport participation and facilities,neighborhood safety,and involvement of family must be prioritized.

关键词： Adolescents Environment Objective Sedentary behavior Socioecologic model

Clinical supervision for novice millennial nurses in the perinatal setting: The need for generational sensitivity

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Open journal of Nursing 2013年第5期3卷 373-378页

作者： jo Watson G. j. Macdonald Donna Brown Lawrence S Bloomberg Faculty of Nursing University of Toronto Toronto Canada Sunnybrook Health Sciences Centre Toronto Canada

This paper reports on a qualitative research study that examined the experience of expert and novice nurses participating in a new, reflective program of “clinical supervision”, intending to facilitate the transition of new graduate nurses into the workforce. Three patterns emerged during the constructivist inquiry: readiness to reflect, valuing of clinical supervision, and sustainability of the clinical supervision model. The researchers suggest generational sensitivity as a key perspective to consider when developing engaging workplace strategies for millennial nurses. The article offers recommendations for the implementation of clinical supervision and would be of interest to nurse leaders in a clinical setting.

关键词： New Graduate Nurses Clinical Supervision Generational Sensitivity Constructivist Inquiry

Numerical Solution for a Non-Fickian Diffusion in a Periodic Potential

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Communications in Computational Physics 2013年第2期13卷 502-525页

作者： Adérito Araújo Amal K.Das Cidália Neves Ercília Sousa CMUC Department of MathematicsUniversity of Coimbra3001-454 CoimbraPortugal Department of Physics DalhousieUniversityHalifaxNova Scotia B3H3J5Canada ISCAC Polytechnic Institute of Coimbra3040-316 CoimbraPortugal

Numerical solutions of a non-Fickian diffusion equation belonging to a hyperbolic type are presented in one space *** Brownian particle modelled by this diffusion equation is subjected to a symmetric periodic potential whose spatial shape can be varied by a single *** consider a numerical method which consists of applying Laplace transform in time;we then obtain an elliptic diffusion equation which is discretized using a finite difference *** analyze some aspects of the convergence of the *** results for particle density,flux and mean-square-displacement(covering both inertial and diffusive regimes)are presented.

关键词： Numerical methods Laplace transform telegraph equation periodic potential non-Fickian diffusion

Rationale of a Cross Sectional Descriptive Study on Knowledge and Practices of Healthcare Providers on Postpartum Hemorrhage Management in Kinshasa, the Democratic Republic of the Congo

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Open journal of Obstetrics and Gynecology 2023年第9期13卷 1453-1459页

作者： Muela Andy Mbangama Mubalamata Eugène-Patrick Lukusa Ambis joëlle Lumaya Nkongolo Freddy Muamba Banza jésual Lotoy Nkashama Bienvenu Kazadi Ndombasi Nelda Lemba Otem Christian Ndesanzim Feruzi Michel Mangala Department of Gynecology and Obstetrics University Clinics of Kinshasa Kinshasa The Democratic Republic of the Congo

Background: Healthcare Providers’ knowledge and practice of postpartum hemorrhage (PPH) management are essential to reduce maternal morbidity and mortality. PPH is a public health problem due to the high maternal mortality (MM) associated with it worldwide (25%). Improving the quality of PPH management is a major challenge in low-income countries where, despite the progress made in its management, PPH remains a major contributor to maternal morbidity and mortality. Objective: We will evaluate the level of knowledge and practices of providers in the PPH management in Kinshasa in the Democratic Republic of the Congo (DRC). Methods: This study will be descriptive and cross-sectional. The minimum sample size will be 86. Our study population will consist of delivery room care providers. Results will be reported as percentage proportion and mean plus or minus standard deviation. Comparisons of means between groups will be made using Student’s t-test and Pearson’s chi-square test. The test will be statistically significant for a p value 0.05. Data will be collected and processed anonymously and confidentially. Conclusion: Improving quality of care must be a priority in obstetrics. This evaluation requires us to determine the level of knowledge and practices of providers in the PPH management in Kinshasa.

关键词： Knowledge Practices Providers Management and PPH

Single-shot real-time compressed ultrahigh-speed imaging enabled by a snapshot-to-video autoencoder

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Photonics Research 2021年第12期9卷 2464-2474页

作者： XIANGLEI LIU joÃO MONTEIRO ISABELA ALBUQUERQUE YINGMING LAI CHENG jIANG SHIAN ZHANG TIAGO H.FALK jINYANG LIANG CentreÉnergie Matériaux Télécommunications Institut National de la Recherche ScientifiqueVarennesQuébec J3X1S2Canada State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

Single-shot 2 D optical imaging of transient scenes is indispensable for numerous areas of *** existing techniques,compressed optical-streaking ultrahigh-speed photography(COSUP)uses a cost-efficient design to endow ultrahigh frame rates with off-the-shelf CCD and CMOS *** far,COSUP’s application scope is limited by the long processing time and unstable image quality in existing analytical-modeling-based video *** overcome these problems,we have developed a snapshot-to-video autoencoder(S2 V-AE)—which is a deep neural network that maps a compressively recorded 2 D image to a *** S2 V-AE preserves spatiotemporal coherence in reconstructed videos and presents a flexible structure to tolerate changes in input *** in compressed ultrahigh-speed imaging,the S2 V-AE enables the development of single-shot machine-learning assisted real-time(SMART)COSUP,which features a reconstruction time of 60 ms and a large sequence depth of 100 ***-COSUP is applied to wide-field multiple-particle tracking at 20,000 frames per *** a universal computational framework,the S2 V-AE is readily adaptable to other modalities in high-dimensional compressed ***-COSUP is also expected to find wide applications in applied and fundamental sciences.

关键词： frames video overcome