Retail planning and urban resilience - An introduction to the special issue

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Magnetic phase transitions in Gd64Sc36 studied using non-contact ultrasonics

The speed and attenuation of ultrasound propagation can be used to determine material properties and identify phase transitions. Standard ultrasonic contact techniques are not always convenient due to the necessity of using couplant; however, recently reliable non-contact ultrasonic techniques involving electromagnetic generation and detection of ultrasound with electromagnetic acoustic transducers (EMATs) have been developed for use on electrically conducting and/or magnetic materials. We present a detailed study of magnetic phase transitions in a single crystal sample of Gd64Sc36 magnetic alloy using contact and non-contact ultrasonic techniques for two orientations of external magnetic field. Phase diagrams are constructed based on measurements of elastic constant C33, the attenuation and the efficiency of generation when using an EMAT. The EMATs are shown to provide additional information related to the magnetic phase transitions in the studied sample, and results identify a conical helix phase in Gd64Sc36 in the magnetic field orientation

Square vortex solitons with a large angular momentum

We show the existence of square shaped optical vortices with a large value of the angular momentum hosted in finite size laser beams which propagate in nonlinear media with a cubic-quintic nonlinearity. The light profiles take the form of rings with sharp boundaries and variable sizes depending on the power carried. Our stability analysis shows that these light distributions remain stable when propagate, probably for unlimited values of the angular momentum, provided the hosting beam is wide enough. This happens if the peak amplitude approaches a critical value which only depends on the nonlinear refractive index of the material. A variational approach allows us to calculate the main parameters involved. Our results add extra support to the concept of surface tension of light beams that can be considered as a trace of the existence of a liquid of light.Comment: 6 pages, 6 figures, submitted to Phys. Rev.

Tuberous sclerosis: two cases of a rare disease

Introdução: A Esclerose tuberosa (ET) é uma doença neurocutânea rara, caracterizada pela presença de hamartomas em vários orgãos. A gravidade e prognóstico dependem dos órgãos afectados e da velocidade de crescimento dos hamartomas. Caso Clínico 1: Adolescente de 15 anos, previamente saudável, admitida por quadro de dor lombar súbita. Ao exame ob- jectivo apresentava: lesões faciais papulares, mácula hipopigmentada lombar e dor na palpação dos quadrantes abdominais direitos. A ecografia e TAC abdominal identificaram presença de angiomiolipomas renais e hepáticos e a RM-CE documen- tou lesões do SNC confirmando o diagnóstico de ET. Caso Clínico 2: Lactente de 2 meses, admitido por epilepsia focal. À observação com hipotonia axial ligeira e múltiplas máculas hipopigmentadas. O EEG identificou foco epiléptico parietal direito. RM-CE documentou nódulos subependimá- rios e túberos corticais e a ecografia abdominal revelou múltiplos quistos renais. Medicado com terapêutica anticonvulsivante tripla. Conclusão: A ET tem um espectro clínico alargado, desde assintomática até doença grave e de mau prognóstico. É neces- sário a sua identificação precoce e seguimento regular para antecipar e tratar as complicações

Portuguese Society of Gastroenterology Consensus on the Diagnosis and Management of Hemorrhoidal Disease.

Hemorrhoidal disease (HD) is a frequent health problem with considerable repercussions on patients' quality of life. However, much of the clinical practice related to HD is based on knowledge without scientific evidence and supported largely by empirical experience of the physician who deals with this pathology. As in other countries, the goal of this consensus is to establish statements supported by solid scientific evidence and whose purpose will be to standardize and guide the diagnosis and management of HD both in the general population and in some particular groups of patients.info:eu-repo/semantics/publishedVersio

Brief report on double-chamber syringes patents and implications for infusion therapy safety and efficiency

This review aimed to map the existing patents of double-chamber syringes that can be used for intravenous drug administration and catheter flush. A search was conducted in the Google patents database for records published prior to 28 October 2020, using several search terms related to double-chamber syringes (DCS). Study eligibility and data extraction were performed by two independent reviewers. Of the initial 26,110 patents found, 24 were included in this review. The 24 DCS that were found display two or more independent chambers that allow for the administration of multiple solutions. While some of the DCS have designated one of the chambers as the flushing chamber, most patents only allow for the sequential use of the flushing chamber after intravenous drug administration. Most DCS were developed for drug reconstitution, usually with a freeze-dried drug in one chamber. Some patents were designed for safety purposes, with a parallel post-injection safety sheath chamber for enclosing a sharpened needle tip. None of the DCS found allow for a preand post-intravenous drug administration flush. Given the current standards of care in infusion therapy, future devices must allow for the sequential use of the flushing chamber to promote a pre-administration patency assessment and a post-administration device flush.info:eu-repo/semantics/publishedVersio

Improving peripheral venous catheterization-related outcomes in oncology patients: an action research study in Portugal

info:eu-repo/semantics/publishedVersio

Anomalous magnetoresistance behavior of CoFe nano-oxide spin valves at low temperatures

We report magnetoresistance curves of CoFe nano-oxide specular spin valves of MnIr/CoFe/nano-oxidized CoFe/CoFe/Cu/CoFe/nano-oxidized CoFe/Ta at different temperatures from 300 to 20 K. We extend the Stoner-Wolfarth model of a common spin valve to a specular spin valve, introducing the separation of the pinned layer into two sublayers and their magnetic coupling across the nano-oxide. We study the effect of different coupling/exchange (between the antiferromagnetic layer and the bottom sublayer) field ratios on the magnetization and magnetoresistance, corresponding with the experimentally observed anomalous bumps in low temperature magnetoresistance curves.Comment: 4 pages; 3 figure

Traducción, adaptación cultural y validación de la escala Venous International Assessment al portugués europeo

Background: A significant number of adult patients experience difficult peripheral intravenous ac-cess, leading to multiple puncture attempts and venous network depletion. The Venous International Assessment (VIA) Scale is referenced internationally as a reliable instrument that classifies patients’ peripheral intravenous accesses and determines the risk of related complications. Objectives: To translate, culturally adapt and validate the VIA Scale to European Portuguese. Methodology: Study of the translation, cultural adaptation, and evaluation of the psychometric prop-erties of the VIA Scale in a nonprobability sample with 100 patients in need of peripheral intravenous catheterization. Results: The Portuguese version of the VIA Scale (EARV) revealed moderate inter-rater reliability scores (k = 0.490; p < 0.0005). The criterion and construct validity of the EARV were assessed through predictive, convergent, and correlational analysis, with moderate to large magnitudes, and statistical significance. Conclusion: The EARV is a reliable and valid instrument that can assist Portuguese health professionals in determining and categorizing difficult peripheral intravenous access. Further studies are recommended to test the transversal applicability of the scale.Enquadramento: Um número significativo de pessoas adultas tem um acesso venoso periférico difícil, o que leva a múltiplas tentativas de punção e ao esgotamento da rede venosa. A escala Venous International Assessment (VIA) é considerada a nível internacional como um instrumento fiável que classifica as vias de acesso venoso periférico das pessoas e determina o risco de complicações associadas. Objetivos: Traduzir, adaptar culturalmente e validar a Escala VIA para português europeu. Metodologia: Estudo da tradução, adaptação cultural, e avaliação das propriedades psicométricas da escala VIA em amostra não probabilística de 100 pessoas doentes a precisar de cateterização venosa periférica. Resultados: A versão em português europeu da escala VIA (EARV) revelou valores moderados de fiabilidade inter-observadores (k = 0,490; p < 0,0005). As validades do critério e do constructo da EARV foram avaliadas através de análise preditiva, convergente e correlacional, com magnitudes moderadas a grandes e significância estatística. Conclusão: A EARV é um instrumento fiável e válido que pode ajudar os profissionais de saúde portugueses na determinação e categorização de acessos venosos periféricos difíceis. Contudo, recomenda-se a realização de mais estudos para testar a aplicabilidade transversal desta escala.Marco contextual: Un número significativo de adultos experimenta dificultades al ser sometido a un acceso venoso periférico, lo que provoca múltiples intentos de punción y el deterioro de la red venosa. La escala Venous International Assessment (VIA) está considerada internacionalmente como un instrumento fiable que clasifica los accesos venosos periféricos en las personas y determina el riesgo de complicaciones relacionadas. Objetivos: Traducir, adaptar culturalmente y validar la escala VIA al portugués europeo. Metodología: Estudio de traducción, adaptación cultural y evaluación de las propiedades psicométricas de la escala VIA en una muestra no probabilística con 100 personas que necesitan ser sometidos a un cateterismo venoso periférico. Resultados: La versión portuguesa desarrollada de la escala VIA (EARV) mostró puntuaciones de concordancia entre evaluadores moderadas (k = 0,490; p < 0,0005). La validez de criterio y de constructo de la EARV se evaluó mediante un análisis predictivo, convergente y correlacional, con magnitudes de moderadas a amplias y significación estadística. Conclusión: La EARV es un instrumento fiable y válido que puede ayudar a los profesionales sanitarios portugueses a determinar y categorizar la dificultad de un acceso venoso periférico. Se necesita realizar futuros estudios para comprobar la aplicabilidad transversal de la escala.info:eu-repo/semantics/publishedVersio