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31.
Prof. Dr. Mircea Herovanu 《Pure and Applied Geophysics》1959,44(1):315-321
Summary By comparing the equalities expressing the solar flux within a wide spectral region on the assumption of an extintion within the atmospheric aerosol given by – and that of an extintion represented by 1–1, a relationship is established by means of which: 1) The error is discussed which is done when the air opacity is expressed by 1, in the case when 1; 2) A simple and quick method is worked out for determining the parameters and from actinometric observations, carried out within the spectral regions <525 m and 525 m<<625 m. 相似文献
32.
Constantin Cosma Botond Papp Mircea Moldovan Victor Cosma Ciprian Cindea Liviu Suciu Adelina Apostu 《Acta Geophysica》2010,58(5):947-956
Soil radon gas and/or its exhalation rate are used as indicators for some applications, such as uranium exploration, indoor
radon concentration, seismic activity, location of subsurface faults, etc., and also in the studies where the main interest
is the field verification of radon transport models. This work proposes a versatile method for the soil radon sampling using
a special manner of pumping. The soil gas is passed through a column of charcoal by using passive pumping. A plastic bottle
filled with water is coupled to an activated charcoal column and the flow of water through an adjustable hole made at the
bottom of bottle assures a controlled gas flow from the soil. The results obtained for the activity of activated charcoal
are in the range of 20–40 kBq/m3, for a depth of approximately 0.8 m. The results obtained by this method were confirmed by simultaneous measurements using
LUK 3C device for soil radon measurements. Possible applications for the estimation of radon soil potential are discussed. 相似文献
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34.
Results from the application of digital filtering (simple and weighted averaging) to the analysis of sedimentary series are given. Two flysch sequences from the East Carpathians (Upper Eocene, Damacua Valley; and Lower Cretaceous, Sbrancani Valley) were studied. Individual components, affecting the conditions of deposition, were separated, and establishment of the geological significance of the components separated by digital filtering was investigated. 相似文献
35.
Spatiotemporal distribution of aridity indices based on temperature and precipitation in the extra-Carpathian regions of Romania 总被引：2，自引：2，他引：0
Adina-Eliza Croitoru Adrian Piticar Alexandru Mircea Imbroane Doina Cristina Burada 《Theoretical and Applied Climatology》2013,112(3-4):597-607
In the last decades, droughts are a recurrent phenomena in many regions of the world, especially in the subtropics and mid-latitudes, affecting more and more the society. Aridity indices are often used to identify regions prone to that phenomenon. In this paper, we used data recorded in 30 locations in the extra-Carpathian areas of Romania over the period 1961–2007. The De Martonne aridity index (I DM) and the Pinna combinative index (I P) were employed in order to identify critical areas in the most important agricultural regions of the country. Monthly, seasonal, annual, and winter wheat and maize growing season datasets of I DM and annual values of I P were calculated. The trends were identified using the Mann–Kendall test and Sen’s slope, while ordinary Kriging technique was employed for interpolation. The main findings are that the most vulnerable to semi-aridity are the southeastern regions, especially during the warm period of the year, and that for Romania, the use of I DM is more appropriate compared to I P. 相似文献