A Hemispherical Contact Model for Simplifying 3D Occlusal Surfaces

Statement of problem Currently, dental articulators can recreate mandibular movements and occlusal contacts. However, whether virtual articulators can also provide information about occluding dental surfaces, functional movements, and the mandibular condyles is unclear. Purpose The purpose of this in vitro study was to evaluate the occluding surfaces on dental casts obtained from a patient and approximate them to a hemispherical contact model. Both models were tested by digitizing the Dentatus ARL dental articulator. Material and methods A combination of photogrammetry and structure from motion methods were used to scan a Dentatus ARL articulator and representative dental casts. Using computer-aided engineering and finite element analysis, contact points and action vectors to the forces on occluding surfaces and condyles were obtained for cast and hemispherical models. This experiment was performed using centric occlusion and 3 different condylar inclinations. The Kruskal-Wallis 1-way analysis of variance on ranks test was used to allow all pairwise comparisons between condylar inclination and mechanical action vector values in each location (α=.05). Results Action vectors from the cast model and each location of the hemispherical model were calculated to show the mechanical consequences and the similarity among models. Overall, no significant differences were observed for action vectors (A20 versus A40 versus A60) at each location (dental cast/hemisphere, right condylar, and left condylar) in the analysis of dental casts and the hemisphere model (.382≤P≤.999). Conclusions This study provided graphical information that may assist the dental professional in determining which occlusal contacts should be modified to attain condylar and balanced centric occlusion

A Low-Cost Energy-Efficient Raspberry Pi Cluster for Data Mining Algorithms

International audienceData mining algorithms are essential tools to extract information from the increasing number of large datasets, also called BigData. However, these algorithms demand huge amounts of computing power to achieve reliable results. Although conventional High Performance Computing (HPC) platforms can deliver such performance, they are commonly expensive and power-hungry. This paper presents a study of an unconventional low-cost energy-efficient HPC cluster composed of Raspberry Pi nodes. The performance, power and energy efficiency obtained from this unconventional platform is compared with a well-known coprocessor used in HPC (Intel Xeon Phi) for two data mining algorithms: Apriori and K-Means. The experimental results showed that the Raspberry Pi cluster can consume up to 88.35% and 85.17% less power than Intel Xeon Phi when running Apriori and K-Means, respectively, and up to 45.51% less energy when running Apriori

Characterization of stainless steel spent pickling sludge and prospects for its valorization

Fluorspar is considered a critical raw material for the European Union, due to its industrial uses and lack of sufficient extraction in European countries. It is a source for hydrofluoric acid manufacture, this latter chemical being employed, among other uses, in the pickling of stainless steels. From this latter activity, sludge is generated due to the need for used water treatment. In this article, we report a full characterization of this residue, obtained in an industrial plant in Vieira de Leiria, Portugal. Its chemical and mineralogical characteristics were determined, showing that it is mostly a mixture of calcium fluoride and calcium sulfate with some heavy metals content. Thermal behavior allowed us to determine that the material melts at around 950 ◦C. The influence of calcining operation on the residue was determined, especially concerned with the leachability of some elements. Taking into account the results of the characterization of this residue, some considerations are presented about the potential for the valorization of this industrial residue.Bollinghaus Steel, S

Contabilidade Gerencial – Gestão Estratégica na Agregação de Valor Por Meio da Aplicação do 13º Salário: Um Estudo de Caso no Hospital Vila da Serra

A aplicabilidade da contabilidade gerencial de maneira estratégica nas empresas tem merecido maior atenção dos pesquisadores e executivos nos últimos tempos, tendo em vista a mudança do foco da contabilidade de custo para a contabilidade gerencial voltada mais para a criação de valor para o acionista. Portanto, partindo nesse pressuposto este artigo teve por objetivo pesquisar como a empresa está gerindo estrategicamente a agregação de valor e consecutivamente o aumento da riqueza do acionista. A revisão teórica teve abordagem voltada para a contabilidade gerencial. A metodologia adotada foi qualitativa e o método descritivo, os dados foram levantados por meio da técnica de aplicação de entrevista com o gestor de recurso humanos, focado ainda uma leve investigação documental. Para análise e tabulação dos dados utilizou-se fórmula de capitalização, simulando uma aplicação do valor do 13º salário pago aos funcionários em 2005 pelo hospital, em prol de demonstrar resultado estratégico para tomada de decisão que direciona agregação de valor para a empresa. E nesse sentido obteve no resultado do estudo de caso que a empresa mesmo calculando todos os meses a provisão do 13º salário não adota estrategicamente a contabilidade gerencial para aplicação do dinheiro de modo a agregar valor para o acionista e para a empresa

O caso do eculizumabe: judicialização e compras pelo Ministério da Saúde

OBJECTIVES: This study examined the purchases of eculizumab, a high-cost monoclonal antibody used in the treatment of rare diseases by Brazilian federal agencies, in terms of purchased quantities, expenditures, and prices. METHODS: Eculizumab purchases made between March 2007 and December 2018 were analyzed, using secondary data extracted from the Federal Government Purchasing System (SIASG in Portuguese). The following aspects were assessed: number of purchases, purchased quantities, number of daily doses defined per 1,000 inhabitants per year, annual expenditures, and prices. The prices were adjusted by the National Broad Consumer Price Index for December 2018. Linear regression was used for trend analysis. RESULTS: All acquisitions by federal agencies were made by the Brazilian Ministry of Health. The purchases began in 2009 with tender waiver to comply with legal demand. There was an increasing trend in the number of purchases and quantities acquired over time. Two hundred and eighty-three purchases were made, totaling 116,792 units purchased, 28.2% of them in 2018. The adjusted total expenses summed more than R$2.44 billion. After market approval by the Brazilian Health Regulatory Agency, the weighted average price fell approximately 35$ 2,44 bilhões. Após a aprovação do registro pela Agência Nacional de Vigilância Sanitária, o preço médio ponderado caiu aproximadamente 35%, para valores abaixo dos preços estabelecidos pela Câmara de Regulação do Mercado de Medicamentos. CONCLUSÃO: O eculizumabe representou gastos extremamente significativos para o Ministério da Saúde no período. Todas as compras foram feitas para atendimento de demandas judiciais, fora do ambiente competitivo. Seu registro promoveu queda importante nos preços praticados. O estudo aponta a relevância do registro sanitário e da necessidade de monitoramento e auditoria permanentes das compras de medicamentos para atendimento de demandas judiciai

Avaliação da resistência de biótipo de Amaranthus Viridis ao Herbicida Glifosato / Evaluation of the resistance of biotype of caruru to Herbicide Glyphosate

No Brasil, a resistência de plantas daninhas é um processo que vem evoluindo gradativamente, prejudicando desta forma profissionais vinculados ao agronegócio como um todo, impactando o custo da lavoura e o meio ambiente. Sua resistência advém de biótipos previamente existentes nas áreas de produção, que tem sua frequência de ocorrência aumentada em função do insucesso no controle diante de aplicações repetidas e perduradas de herbicidas os quais apresentam o mesmo princípio ativo ou utilização contínua do mesmo produto fitossanitário. Os casos de resistência ao glifosato vêm aumentando, sendo necessário evitar a perda da viabilidade do produto. Nesse contexto, biótipos da espécie Amaranthus viridis, o caruru, tem apresentado dificuldade em seu controle. Diante da constante evolução de casos de resistência de plantas daninhas a herbicidas, o presente trabalho teve como objetivo avaliar a existência de resistência de biótipo de A. viridis ao herbicida glifosato na região de Campo Grande - MS. As sementes de caruru foram semeadas em bandeja plástica com capacidade de 2 litros e seu transplante foi realizado 14 dias após a semeadura. Foram utilizados 4 tratamentos, cada um com 30 repetições. Os tratamentos consistiram em: T0 (tratamento controle sem aplicação de glifosato); T1 (1000 g p.c. ha-1); T2 (2000 g p.c. ha-1); T3 (4000 g p.c. ha-1). Constatou-se que T0 (tratamento controle sem aplicação de glifosato); T1 (1000 g p.c. ha-1), não se diferenciaram. Foi observado no trabalho um maior número de plantas que sobreviveram no T1(100%), porém utilizou-se uma dosagem que corresponde à metade da recomendada para caruru. No que diz respeito ao segundo tratamento, T2 (dosagem recomendada para controle de caruru na cultura da soja) observou-se 60% de sobrevivência. Por fim, no tratamento T3 não se observou sobrevivência. A partir dos resultados obtidos no presente trabalho, foi possível registrar a presença de biótipo de Amaranthus viridis com características de resistência ao herbicida glifosato em Campo Grande - MS

Modelo de factores que afectan el interés individual de los estudiantes en las ciencias básicas: diseño y validación de un cuestionario: Model of factors affecting the individual interest of students in basic sciences: design and validation of a questionnaire

The purpose was to design and validate an instrument to measure a set of endogenous and exogenous factors that affect the individual interest of students in learning basic science in secondary school. In the first stage, a multivariate factor model was developed using the grounded theory method. Based on the model, the questionnaire was designed and then content validation was carried out, with the participation of judges and a pilot test. The initial version of the instrument contains 21 items, each of them represents an endogenous or exogenous causal factor; the construct validation was done with students from 1st to 5th year of secondary school. The exploratory factor analysis was carried out with a sample of 274 students, identifying 6 latent dimensions and the confirmatory factor analysis with a sample of 336 students. The results show optimal evidences of the questionnaire that corroborate its validity. It is a practical instrument that, through the perceptual evaluations of the students, empirical inquiries can be made about the effects of each of the factors that affect the individual interest of the students, giving rise to multivariate diagnoses. Keywords: Endogenous and exogenous factors, interest, basic sciences, validation, questionnaire.Resumen: El propósito fue diseñar y validar un instrumento para medir a un conjunto de factores endógenos y exógenos que afectan el interés individual de los estudiantes en el aprendizaje de las ciencias básicas. Primeramente, se elaboró un modelo multivariado de factores y luego se diseñó el cuestionario, que fue sometido a validación de contenido con la participación de jueces y una prueba piloto. La validación de constructo se hizo mediante el análisis factorial exploratorio, con una muestra de 274 alumnos de educación secundaria, se identificaron cinco dimensiones latentes. El análisis factorial confirmatorio se realizó con una muestra de 336 alumnos. Los resultados muestran evidencias óptimas del cuestionario que corroboran su validez con 18 ítems. Es un instrumento práctico que permite realizar indagaciones empíricas sobre los efectos de cada uno de los factores que afectan el interés individual mediante las valoraciones perceptivas de los alumnos, dando lugar a diagnósticos multivariados. Palabras clave: factores endógenos y exógenos, interés hacia las ciencias básicas, validación.     Abstract: The purpose was to design and validate an instrument to measure a set of endogenous and exogenous factors that affect the individual interest of students in learning basic sciences. First, a multivariate factor model was developed and then the questionnaire was designed, which was submitted to content validation with the participation of judges and a pilot test. The construct validation was done through exploratory factor analysis, with a sample of 274 secondary school students, five latent dimensions were identified. The confirmatory factor analysis was carried out with a sample of 336 students. The results show optimal evidence of the questionnaire that corroborates its validity with 18 items. It is a practical instrument that allows empirical inquiries to be made about the effects of each of the factors that affect individual interest through perceptual evaluations of the students, giving rise to multivariate diagnoses. Keywords: endogenous and exogenous factors, interest in basic sciences, validation

Iron(iii) oxamato-catalyzed epoxidation of alkenes by dioxygen and pivalaldehyde

A new iron(III)–carbonato monomeric complex of orthophenylenebis( oxamato) (opba) 1 is synthesized, and spectroscopically and structurally characterized; it is a moderately efficient non-heme catalyst for the aerobic epoxidation of alkenes with co-oxidation of pivalaldehyde.Ruiz Garcia, Rafael, [email protected] ; Fernandez Picot, Isabel, [email protected] ; Pedro Llinares, Jose Ramon, [email protected]