PHENOMENOLOGICAL ANALYSIS OF A CONCEPTUAL WATERJET PROPULSOR BASED ON THE COANDA EFFECT

This work is part of a research project conceived at the Federal University of Rio Grande. The project aims to create and develop mechanical devices that use the Coanda effect to enhance their overall efficiency. The focus herein is analyzing the physical phenomenon occurring in a conceptual water-jet propulsor. In the proposed concept, a water-jet propulsor has its impeller replaced by injectors that produce the so-called Coanda effect, increasing thereby the mass flow rate. In order to simulate the flow through the propulsor, a numerical model was developed. In this model the time-averaged conservation equations of mass and momentum were solved numerically by the finite volume method, more precisely with the commercial package ANSYS FLUENT (version 14.0). For the closure of the constitutive equations, the k-ω URANS turbulence model was employed. The simulation was performed for a transient state with a timestep of ∆t = 1×10-3 s and a total physical time of t = 6.0 s. Static pressure fields, streamlines and speed profiles are used to analyze the equipment performance and the phenomenon occurrence. The results show that the Coanda Effect is able to generate thrust in a waterjet propulsion device without impeller. The study suggests that the employment of this principle has promising applicability in marine propulsion and deserves attention on future works

Demandas tecnológicas para o sistema produtivo da mandioca nas microrregiões de Altamira e Santarém, no estado do Pará.

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Syrah tropical red wine and residue health benefits according to in vitro and in vivo analysis using Wistar rats.

The objective of this study was to determine the antioxidant activity of Syrah red wines produced at the São Francisco Valley region and its residue, using in vitro approaches and evaluate the potential beneficial effects of their consumption on biochemical and hematological parameters in Wistar rats

A fuzzy method for the usability evaluation of nuclear medical equipment

To avoid errors when handling nuclear medical equipment, it is important to develop products with a high degree of usability. This can be achieved by performing usability evaluations in the product development process to detect and mitigate potential usability problems. Usability evaluation focuses on how well users can learn and use a product to achieve their goals. Thus, the usability evaluation has become recognized as a valuable complement to the established approaches to design good user interfaces, to reduce incidents and accidents as well the time required to learn how to use the equipment. To gather information about usability, practitioners use a variety of methods that gather feedback from users about an existing interface or plans related to a new interface. A wide range of usability evaluation methods have been proposed, but few methods focus on developing an objective and practical evaluation method for usability. Moreover, the usability evaluations are based on human judgments and most methods cannot fully solve the subjectivity of these evaluations. In order to remedy this deficiency, the purpose of this work is to adopt a Fuzzy Set Theory (FST) approach to establish a method for the usability evaluation of nuclear medical equipment based on usability heuristics for user interface design and international standards for ergonomics of human-system interaction. To exemplify the method we performed a usability evaluating of the Digital Spectrometer ESP 13004 by testing it with representative users. The results showed that the method is a proactive tool to provide a basis for checking usability of medical device interfaces

Actividad biológica de la Guazuma ulmifolia Lamark.- revisión sistemática

ABSTRACT The Guazuma ulmifolia Lamark (Malvaceae) is a non-endemic plant, popularly known as mutamba. Its leaves and roots are used in home remedies against dysentery and diarrhea, in the treatment of prostate, as a uterine stimulant and other diseases. Due to the characteristics presented and the growing interest in this species, a systematic review was carried out on the possible pharmacological and toxicological effects of Guazuma ulmifolia Lamark. As active compounds, the articles cited the presence of flavonoids, saponins, alkaloids, tannins, phenolic compounds and steroids in different parts of the plant and extracted with different solvents. Regarding the experimental studies, no articles were found with clinical test, and only 4 in vivo studies. About the pharmacological effects we can mention activity against leishmaniasis, hypoglycemic, anti-inflammatory, anticholinesterase, anti-obesity, antiseptic, cicatrizant and anthelmintic. The registered toxicological tests were directed against lineages of cancer cells, proving effective, however, there is a need for studies to attest the safety of G. ulmifolia use by the population. Therefore, it is imperative to carry out further studies to ensure the use of this plant, to know doses and form of indication, as well as clinical studies in order to guarantee a correct therapy. Keywords: Guazuma ulmifolia, toxicity, medicinal plants.    RESUMO A Guazuma ulmifolia Lamark (Malvaceae) é uma planta não endêmica, popularmente conhecida por mutamba. Suas folhas e raízes são empregadas em remédios caseiros contra disenteria e diarreias, no tratamento de próstata, como estimulante uterino e outras enfermidades. Em virtude das características apresentadas e o crescente interesse por esta espécie, tanto para fins medicinais como alimentício, realizou-se uma revisão sistemática sobre os possíveis efeitos farmacológicos e toxicológicos da Guazuma ulmifolia Lamark. Como compostos ativos, os artigos citaram a presença de flavonoides, saponinas, alcaloides, taninos, compostos fenólicos e esteróides em diferentes partes da planta e extraídos com diferentes solventes. Quanto aos estudos experimentais, não foram encontrados artigos com teste clínico e, apenas 4 estudos com testes in vivo. Dos efeitos farmacológicos encontrados, pode-se citar atividade contra leishmaniose, hipoglicemiante, antiinflamatório, anticolinesterásico, antiobesidade, antisséptico, cicatrizante e anti-helmíntico. Os testes toxicológicos registrados foram direcionados contra linhagens de células cancerígenas mostrando-se efetivo, porém, há necessidade de estudos para atestar a segurança de uso de G. ulmifolia pela população. Logo, apesar de utilizada, é imperativa a realização de mais estudos para assegurar o uso desta planta pela população e conhecer doses e forma de indicação, além de estudos clínicos que garantam uma correta terapêutica. Palavras-chave: Guazuma ulmifolia, toxicidade, plantas medicinais.RESUMEN La Guazuma ulmifolia Lamark (Malvaceae) es una planta no endémica, popularmente conocida por mutamba. Sus hojas y raíces son empleadas en remedios caseros contra disentería y diarreas, en el tratamiento de próstata, como estimulante uterino y otras enfermedades. En virtud de las características presentadas y el creciente interés por esta especie, tanto para fines medicinales como alimenticios, se realizó una revisión sistemática sobre los posibles efectos farmacológicos y toxicológicos de la Guazuma ulmifolia Lamark. Como compuestos activos, los artículos citaron la presencia de flavonoides, saponinas, alcaloides, taninos, compuestos fenólicos y esteroides en diferentes partes de la planta y extraídos con diferentes solventes. En cuanto a los estudios experimentales, no se encontraron artículos con prueba clínica y, sólo 4 estudios con pruebas in vivo. De los efectos farmacológicos encontrados, se puede citar actividad contra leishmaniasis, hipoglicemiante, antiinflamatorio, anticolinesterásico, antiobesidad, antiséptico, cicatrizante y antihelmíntico. Las pruebas toxicológicas registradas se dirigieron contra los linajes de las células cancerígenas que se mostraron efectivos, pero hay necesidad de estudios para certificar la seguridad de uso de G. ulmifolia por la población. Por lo tanto, a pesar de ser utilizada, es imperativa la realización de más estudios para asegurar el uso de esta planta por la población y conocer dosis y forma de indicación, además de estudios clínicos que garanticen una correcta terapéutica. Descriptores: Guazuma ulmifolia, toxicidad, plantas medicinales