45 research outputs found
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 depuraci贸n de contaminantes fluorados en hornos cer谩micos
Treball Final de Grau en Enginyeria Qu铆mica. Codi: EQ1044. Curs acad猫mic: 2021/2022La finalidad de este proyecto es la instalaci贸n de un filtro depurador de contaminantes,
para los hornos utilizados en la producci贸n cer谩mica de la empresa FABRICACI脫N
ESPA脩OLA SANITARIA S.A. (Fabresa) Para as铆 poder cumplir con los Valores L铆mites
de Emisi贸n (VLE) establecidos por los documentos BREF, los cuales se basan las
Mejores T茅cnicas Disponibles (MTD) para fijar dichos valores.
Tras haber consultado la Autorizaci贸n Ambiental Integrada (AAI) de la empresa, se
detectaron elevados niveles de fluoruro de hidr贸geno (HF) provenientes de los dos hornos
de cocci贸n del producto sin esmaltar. El HF al ser un contaminante peligroso para las
personas y t贸xico para plantas y animales, debe ser depurado, lo que condiciona a la
empresa a instalar un filtro para depurarlo.
Para la instalaci贸n del filtro se han estudiado diferentes alternativas, entre ellas: usar
filtros de mangas con adici贸n de reactivo, lechos fijos de adsorci贸n con adici贸n de
reactivo o la depuraci贸n v铆a h煤meda. Se analizaron las ventajas y desventajas de estos
equipos y se seleccion贸 el m谩s adecuado para tratar este tipo de contaminantes.
Una vez seleccionado el filtro 贸ptimo, se analizaron los diferentes reactivos a utilizar para
llevar a cabo la neutralizaci贸n, bajo la condici贸n de haber elegido un equipo que necesite
adici贸n de reactivo. Los par谩metros considerados para seleccionar el mejor reactivo
fueron: la forma de alimentaci贸n, el coste del reactivo y el contaminante a eliminar. Al
tratarse de HF, se contemplaron el hidr贸xido de calcio (Ca(OH)2) y el bicarbonato de
sodio (NaHCO3). Se plantearon los sistemas de reacci贸n y se escogi贸 el m谩s adecuado.
Posteriormente a la selecci贸n del filtro 贸ptimo y reactivo a adicionar, se estudi贸 la
implementaci贸n de un filtro com煤n para las dos chimeneas de los dos hornos o la
instalaci贸n de un filtro para cada chimenea. An谩logamente a los procedimientos
anteriores, se estudiaron las dos posibilidades y se eligi贸 la mejor opci贸n.
Finalmente, al haber elegido las mejores alternativas para cada una de las selecciones, se
plantearon las ecuaciones correspondientes al funcionamiento del sistema de depuraci贸n,
los par谩metros para su dimensionamiento y un estudio econ贸mico en torno a la instalaci贸n
de est
THEORETICAL CONSIDERATION AND EXPERIMENTAL RESEARCHES REGARDING THE INFLUENCE OF HOLDING PRESSURE OVER THE SHRINKAGE OF INJECTION MOLDED PIECE.
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, 艦t. M膬ru艧ter 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