Current Situation of GNSS Networks in Romania

Nowadays, the need for a more precise positioning is a very high, therefore very demanding one, and this is one of the reasons why very large research funding is allocated in satellite technology, the second reason being global geopolitics situation. New satellite constellations are being developed existing satellites that have completed their mission are being replaced with satellites that incorporate technology far superior to their predecessors. Currently we have four constellations with global coverage, NAVSTAR-GPS and Glonass, Galileo and Compass. With the development of these global satellite systems, it is also necessary to develop the user segment, so this requires terrestrial reference stations to be updated to recognize the new signals from them. The article presents the situation of the global satellite systems and the situation of the permanent reference networks in Romania, which are developed by state or private companies

Motility parameters of equine epididymal spermatozoa after 24 hours intra-epididymal exposure to lidocaine using two commercial extenders

Epididymal spermatozoa is the last source for gamete rescue in case of emergency castration or sudden death of a valuable stallion, thus an ideal harvesting and preservation technique should be employed. Routinely, 2% lidocaine intraparenchymatous administration is used to provide analgesia prior to castration, but studies on the effect of lidocaine on epididymal spermatozoa motility parameters are limited. The purpose of this study was to determine the effects of lidocaine on equine epididymal spermatozoa, after 24 hours intraepididymal cool storage using two commercial extenders. We hypothesized that intraepididymal prolonged exposure to lidocaine, might affect motility parameters of epididymal stallion spermatozoa and that different extenders might have an impact. Sperm was collected from 20 epididymides of routinely castrated 3 year old KWPN stallions. 4 stallions received 10 ml 2% lidocaine intraparenchymatous 10 minutes prior to castration and 6 stallions were not medicated. Testicles were transported to an equipped facility and cooled stored for 24 hours. From each sample an aliquot was diluted in a commercial egg yolk based extender, and another in a commercial extender containing defined milk proteins. Motility parameters were registered 30 minutes after dilution, computer assisted. There were no statistical differences between motility parameters of spermatozoa exposed to lidocaine and spermatozoa not exposed, however progressive motility and linearity significantly differed among the two extenders

Sistema de depuración de contaminantes fluorados en hornos cerámicos

Treball Final de Grau en Enginyeria Química. Codi: EQ1044. Curs acadèmic: 2021/2022La finalidad de este proyecto es la instalación de un filtro depurador de contaminantes, para los hornos utilizados en la producción cerámica de la empresa FABRICACIÓN ESPAÑOLA SANITARIA S.A. (Fabresa) Para así poder cumplir con los Valores Límites de Emisión (VLE) establecidos por los documentos BREF, los cuales se basan las Mejores Técnicas Disponibles (MTD) para fijar dichos valores. Tras haber consultado la Autorización Ambiental Integrada (AAI) de la empresa, se detectaron elevados niveles de fluoruro de hidrógeno (HF) provenientes de los dos hornos de cocción del producto sin esmaltar. El HF al ser un contaminante peligroso para las personas y tóxico para plantas y animales, debe ser depurado, lo que condiciona a la empresa a instalar un filtro para depurarlo. Para la instalación del filtro se han estudiado diferentes alternativas, entre ellas: usar filtros de mangas con adición de reactivo, lechos fijos de adsorción con adición de reactivo o la depuración vía húmeda. Se analizaron las ventajas y desventajas de estos equipos y se seleccionó el más adecuado para tratar este tipo de contaminantes. Una vez seleccionado el filtro óptimo, se analizaron los diferentes reactivos a utilizar para llevar a cabo la neutralización, bajo la condición de haber elegido un equipo que necesite adición de reactivo. Los parámetros considerados para seleccionar el mejor reactivo fueron: la forma de alimentación, el coste del reactivo y el contaminante a eliminar. Al tratarse de HF, se contemplaron el hidróxido de calcio (Ca(OH)2) y el bicarbonato de sodio (NaHCO3). Se plantearon los sistemas de reacción y se escogió el más adecuado. Posteriormente a la selección del filtro óptimo y reactivo a adicionar, se estudió la implementación de un filtro común para las dos chimeneas de los dos hornos o la instalación de un filtro para cada chimenea. Análogamente a los procedimientos anteriores, se estudiaron las dos posibilidades y se eligió la mejor opción. Finalmente, al haber elegido las mejores alternativas para cada una de las selecciones, se plantearon las ecuaciones correspondientes al funcionamiento del sistema de depuración, los parámetros para su dimensionamiento y un estudio económico en torno a la instalación de est

EXPERIMENTAL RESEARCHES ON A SEPARATING MACHINE

Separator type machines are used in food industry to separate useful parts of poly-granular materials from impurities. Most of their kind are vibratory machines that have specific motions directed with non-equilibrated masses generators. Work paper presented in the following is about vibrations measurements in order to establish that specific motions of these machine types. An original measurement hardware system is used next to specific programs for processing data that are obtained in order to detect motion trajectory along with transmitted vibratory motion to the ground. Conclusions drawn are that supporting elements are good both for motion sustainability and for damping of the transmitted vibrations to the ground

Fixed point theory for nonself generalized contractions in Kasahara spaces

In this paper we extend some results of V. Berinde, Şt. Măruşter and I.A. Rus (Saturated contraction principles for nonself operators, generalizations and applications, Filomat, 31:11(2017), 3391-3406), which were given in metric spaces, to Kasahara spaces. Some research directions are also presented