Vestas (Netherlands)

Aim: In this study, it was aimed to synthesize a new dyestuff with fluorescent active properties, which can be easily produced and water-soluble, to be used in sealing tests. Materials and Methods: The sealing capacities of the implant abutment connection of the dental implant systems manufactured by ESTAŞ were determined spectroscopically by UV-Vis spectrophotometer using the synthesized dyestuff in the first stage. Thanks to the fluorescent active property of the dyestuff, the emission spectra were measured with the fluorescent spectrometer, which is highly sensitive to changes, and the sealing capacities could be determined more precisely, depending on time. In addition, the gap between the implant and the abutment connection was determined using a Scanning Electron Microscope (SEM), and the sealing capacities were evaluated from a different perspective. In addition, sealing tests of the same implant systems were also performed with methylene blue dyestuff and the results were compared. The efficiency of our synthesized dyestuff was determined. Results: The dyestuff to be used in the sealing tests of the implants was synthesized and characterized in a short time in our laboratory. The phthalocyanine compound from the porphyrin class was obtained as a result of the tetramerization reaction of the synthesized phthalonitrile derivative. The dyestuff, which can be synthesized in a short time like 10 minutes, was purified by taking advantage of the solubility difference and chromatographic methods. The obtained dyestuff was characterized by NMR, FTIR, UV-Vis, and MALDI-TOF MS. The results obtained are in harmony with the structure of the molecule. The dyestuff produced is water soluble and was especially used to determine the sealing capacity of the implant abutment connection of dental implant systems produced by ESTAŞ. The sealing properties of the implant were determined by spectroscopic methods such as UV-Vis and fluorescence. In addition, sealing capacities were evaluated with SEM. According to the results obtained, we can say that the synthesized dyestuff is a dye that can give spectroscopically more sensitive results than methylene blue. Conclusions: Dental implants, which are artificially placed in the mouth to support dental prostheses, have changed dental treatment methods to a large extent and become the most preferred successful technique. However, infection risks may occur during the treatment due to the formation of a gap between the abutment cap and the implant resulting from both the production and adaptation of the abutment cap, which is a part of the implant. For this reason, it is important that the implants produced are routinely sensitively checked for sealing and put into use. In addition, sealing control will contribute to the control and shaping of the process from the manufacturing stage of the implant. In line with all the data obtained, it has been determined that the implant types produced by ESTAŞ have a sealing capacity below the acceptable limits. In addition, it was observed that our newly synthesized dyestuff spectroscopically gave sensitive results in the sealing tests of implant systems.

In this work we perform a numerical study on the flow around the hulls of competition kayaks with the aim of predicting accurate drag forces. The numerical simulations were first performed using the Wigley hull geometry, a typical validation case for flows around marine vessels. The total drag force and wave profiles of the hull were determined for different Froude numbers and compared with experimental measurements. After validation and verification of the numerical method, the flow around two competition sprint kayaks was investigated. The drag force was calculated and compared with experimental and numerical data

Atualmente as empresas estão se mostrando cada vez mais preocupadas com o meio ambiente, porém a grande maioria ainda não possui a cultura de controlar os custos ambientais gerados por suas atividades. Dessa forma, este trabalho tem como objetivo mostrar o grau de interesse das indústrias metalúrgicas de Juiz de Fora em contabilizar os gastos gerados com o meio ambiente, quantificando as empresas que adotam o controle dos custos ambientais como ferramenta de ajuda a tomada de decisão. É relevante que as empresas mensurem os custos ambientais e tenham a conscientização de que precisam acompanhar as demandas socioambientais e investir na gestão ambiental, controlando os gastos ambientais, visando contribuir e auxiliar as empresas na quantificação e associação dos custos aos seus processos produtivos. O resultado mostrou que a maior parte das empresas ainda não realiza a contabilização dos custos ambientais, porém já almeja, pela maioria das empresas, melhorar o controle dos custos ambientais.

Synthetic inertia offers the potential to increase power system stability during generation-load imbalances; particularly when conventional generation has been displaced by non-synchronous in-feed. This study is based on three frequency transients caused by the loss of 14% of the synchronous generation on the Irish system. Analysis of PMU data from power plants is used to determine the per unit displacement potential with battery energy storage systems of differing delay times and ramp rates. It is observed that synchronous generators undergo a step change in power output during frequency transients. The unsuitability of a droop response for a synthetic inertia response is demonstrated and that a step change in power output is required to maximize inertial participation. The displacement results are compared to existing and proposed operating characteristics of the Irish system.

Trata-se de apresentar uma leitura da obra Diário da Queda, de Michel Laub, a partir da perspectiva da transmissão da memória e de sua relação com o trauma e a escrita. A título de introdução, faz-se um breve comentário acerca da estruturação da obra e também de sua eventual classificação no gênero autobiográfico. A seguir, recolhemos fragmentos da obra que nos permitem refletir sobre algumas questões como, por exemplo, estas: como se transmite a memória entre gerações? que destino dar ao excesso de memória, à imposição de lembrar? pode-se culpar um sobrevivente da Shoah pela ausência de testemunho, pelo seu silêncio? É possível romper a transmissão do trauma?