Détermination des paramètres d'Ångström par des observations actionmétriques courantes     

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   

Prediction of strong earthquakes in Vrancea,Romania, using the CN algorithm     

O. V. Novikova  I. A. Vorobieva  D. Enescu  M. Radulian  I. Kuznetzov  G. F. Panza 《Pure and Applied Geophysics》1995,145(2):277-296

The application of the CN algorithm to a new earthquake catalogue, for the period from 1932 to 1993, obtained by merging Romanian and U.S.S.R. data, allows us to monitor, on the intermediate time scale. the preparation of strong, intermediate-depth earthquakes in the Vrancea region. Four of the five strong earthquakes with magnitudes above 6.4 are predicted. The total duration of the Time of Increased Probability (TIP) of the occurrence of an earthquake (TIP) occupies 21.7% of the time interval under consideration, i.e., about 2.5 years for each strong earthquake.  相似文献   

Measurement of radon potential from soil using a special method of sampling     

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   

Appareil de mesure du rapport ΔV/I pour la determination de la résistivité apparente en courant continu     

Mircea M. Pauca 《Pure and Applied Geophysics》1958,39(1):102-108

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Digital filtering as a tool for the study of some flysch deposits from the East Carpathians (Romania)     

Radu Botezatu  Mircea Dumitriu 《Mathematical Geology》1972,4(2):103-113

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   

Scaling relationships for the near-fieldP-SV ground motion     

M. Radulian  C-I. Trifu 《Pure and Applied Geophysics》1987,125(1):19-40

A set of monoial scaling relations to parametrize several measures of strong motion (peak velocity, peak starting-phase acceleration, peak stopping acceleration) is proposed. Dynamic solutions are obtained for a 2-D (P-SV) stress-drop model of faulting, and ground motion from these calculations is used to calibrate the scaling relations. Geometrical spreading, radiation patterns, low frequency near-field radiation, and free surface response are analysed, and introduced as corrections. The calculational finite difference method is sound within its frequency range of validity, which is found to be about 0 to 5–6 Hz for the chosen grid steps. A strong difference is obtained between theP andSV motion scalings, mainly with the source rupture velocity. Also noted are significant differences between the starting and stopping accelerations due to different frequency content and the influence of low frequency near-field radiation. To test the estimated scaling relationships, some synthetic predictions of the kinematic parameters are made, with quite good agreement when compared with dynamic computations (errors within 30%). The results emphasize some features of the near-fieldP-SV radiation and allow a kinematic prediction for a simple and smooth source model, but show the limited reliability of such predictions, arising from the problem's complexity.  相似文献   

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