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Publicatii proprii
Accuracy and sensitivity analysis for 54 models of computing hourly diffuse solar irradiation on clear sky
Fifty-four broadband models for computation of solar diffuse irradiation on horizontal surface were tested in Romania (South-Eastern Europe). The input data consist of surface meteorological data, column integrated data, and data derived from satellite measurements. The testing procedure is performed in 21 stages intended to provide information about the sensitivity of the models to various sets of input data. There is no model to be ranked “the
Read moreConductivity Reconstructions Using Real Data from a New Planar Electrical Impedance Device
In this paper, we present results of reconstructions using real data from a new planar electrical impedance tomography device developed at the Institut für Physik, Johannes Gutenberg Universität, Mainz, Germany. The prototype consists of a planar sensing head of circular geometry, and it was designed mainly for breast cancer detection. There are 12 large outer electrodes arranged on a ring of radius R = 4.8 cm where the external currents are injected,
Read moreA new analytic integration of the rate equation for batch dissolution of salts in the presence of Common ion
Following a recent suggestion of a new rate equation specifically for the batch dissolution of salts in solutions containing a common ion, this paper describes an analytic solution to its integration. The equation has been tested by dissolving 250 lm gypsumrock particles in water (26.7 g l-1) containing various mixtures of sodium and calcium chlorides, all at an ionic strength of 0.060 M. The model fitted the experimental curves very well and showed
Read moreConductivity imaging with interior potential measurements
In this article, we present two reconstruction methods intended to be used for conductivity imaging with data obtained from a planar electrical impedance tomography device for breast cancer detection. The inverse problem to solve is different from the classical inverse conductivity problem. We reconstruct the electrical conductivity of a two-dimensional domain from boundary measurements of currents and interior measurements of the potential. One
Read moreTritium analysis in hydraulic oil waste by oxidation technique
The aim of the present study is to investigate a method to evaluate the tritium activity in hydraulic oil waste generated during the operation of Romanian Cernavoda Nuclear Power Plant. The method is based on a combustion technique using the 307 PerkinElmer (R) Sample Oxidizer model. The hydraulic oil samples must be processed prior to counting to avoid color quenching (the largest source of inaccuracy) because these samples absorb in the region
Read moreComputer-Based Nonlinear Analysis for the Seismic Performance Assessment of Three-Dimensional Steel Frameworks
With the rapid advancement of computer technology, research is currently in progress to develop advanced nonlinear inelastic analysis methods and integrate them into the new and more rational advanced analysis and design procedures [1,2,3,4,5]. This paper presents an integrated system for advanced structural analysis and seismic performance evaluation of three-dimensional steel frameworks with rigid or flexible connections. The nonlinear inelastic
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