Results 1 - 10 of 1989
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[en] Experiments performed: Scoping tests have been performed in 1990 to model two primary system break sizes: 500 mm and 178 mm dia; Test results are included for the 500 mm model case; Results show good agreement with the precalculated values; Improvement of the measurement system has been performed in 1991
[en] Complete text of publication follows. The North Hungarian Inspectorate for Environmental Protection runs monitoring stations in Miskolc and its environs. In former years, settled dust was collected at 18 stations. The number of such stations have recently been reduced to nine. At the same time an air monitoring station was installed for collecting PM10 at a point where vehicular traffic is heavy. In and around Miskolc industrial activity is highly concentrated. Of the different kinds of polluting sources, the ironworks was closed down at the end of 2008. As it was thought to be the major air pollutant in Miskolc, emitting also magnetite spherules, we are going to compare, month by month, the mass specific susceptibilities of settled dusts collected at the still existing stations prior and after the closing of the ironworks. PM10 samples were the first time collected in February, 2009, for two weeks. The daily filters were divided. Magnetic measurements were carried out on one quarter, while the rest was analyzed for poisonous metals (Pb, Ni, As, Cd) and organic compounds. It was interesting to observe minimum values of the mass specific susceptibilities on Sundays, which suggests that the magnetic pollutants originate from vehicles. At the same time, no correlation was found between mass specific susceptibilities and the concentrations of the poisonous metals. The latter seem to originate from distant industrial sources and although their concentrations are far from constant, the weekend days are by no means less polluted than the work days. Higher Pb, Ni, As and Cd concentration was measured during the first week of February, when a very weak wind was blowing from the direction of an ore dressing plant. During the second week, a considerably stronger wind was blowing from the same direction, yet the concentration of the above elements became less at the air monitoring station. Acknowledgement: This work was supported by Hungarian Scientific Research Fund (OTKA) project no. K75395.
[en] In the recent years more and more times and in more and more areas (fields) can we hear about thermography applications. These are mostly building-energetical, electrical and mechanical condition monitoring and human-biological applications. Thousands of termocameras are used in Hungary, but the knowledge of the operators and the analyzers is neither controlled nor qualified by any professional organization. In Hungary there is no THERMOGRAPH profession or recognized and claimed exam, this way the market is uncontrolled. This study mentioned the theoretical basics, the practical point of view, the current situation in Hungary and the foreign situation. (S.I.)