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[en] By using the statistical discrimination technique, an equipment for simultaneous measurement of natural background and gamma-ray fields was made. The equipment is using a series area monitor, model REUTER-STOKES, RS - 111, filled with argon at a high pressure, ionization chamber and a conventional 586-PENTIUM personal computer with an incorporated DAS-800 acquisition board for the statistical processing of the analogue signal furnished by the RS-111 area monitor. (authors)
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania); 285 p; ISSN 1454-2714; 
; 1998; p. 249; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
; 1998; p. 249; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
[en] Generalized entropic inequalities are given for Tsallis-like entropies. Also, state independent angle-angular momentum entropic uncertainty relations (SI-EUR) are presented. A proof of SI-EUR can be obtained by applying the general Riesz theorem. Experimental tests of the SI-EUR in pion-nucleus scattering are presented by estimating the scattering entropies from experimental available phase shifts
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 130; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); 2 refs., 1 fig.
; 1998; p. 130; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); 2 refs., 1 fig.
[en] Thickness control in the manufacturing process of various foils of materials like metal, plastic, paper, cellulose, rubber, etc is one of the industrial applications of nuclear techniques. This control is based on the measurement of the exposure rate variation or absorbed dose rate due to the fluctuating thickness of material circulating or placed between radiation source and detector. The exposure rate or the absorbed dose rate is converted into a proportional electrical current. The higher the ionization current stability of ionization chambers (for a constant exposure rate or a constant adsorbed dose rate), the smaller the variations of the exposure rate (or absorbed dose rate) that can be detected, and so, the smaller the thickness variations of the adsorbent material interposed between radiation source and detector that can be determined. (authors)
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 227; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
; 1998; p. 227; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
[en] The spherical ionization chamber under pressure is designed for the secondary calibration of alpha, beta and gamma radioactive sources. We can measure very low activity of such sources by placing them inside the ionization chamber and using air or krypton and xenon gases up to a pressure of 10 Atm. The ionization chamber is made of two hemispherical metallic electrodes polarized with 100-500 V d.c. (authors)
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 226; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
; 1998; p. 226; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
[en] A gamma-ray absorbed dose (dose rate) in air standard was developed for industrial dosimetry applications at the 100kCi 60 Co irradiator of the IFIN-HH. The standard consists of an ionization chamber exposure meter, traceable to a National Institute of Metrology primary standard, and a Fricke dosemeter. The overall uncertainty of the absorbed dose in air standard is 2% for the ionization chamber exposure meter and 7% for the Fricke dosemeter.. A detailed analysis of the uncertainty components revealed the possibility to increase the performances of the standard by improving the technology of manufacturing the Fricke dosemeters (authors)
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 248; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); 3 refs. Short communication
; 1998; p. 248; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); 3 refs. Short communication
[en] The goal of this research was to modernize the radiometric equipment used for the control and automation of technological processes. A microcontroller-equipped electronic block was designed and realized, capable of performing all the tasks of a radiometric system, regardless of the application range (i.e. measurement of density, thickness, level, composition, etc.) or the detector type employed. In this work, the experimental model for the multipurpose radiometric equipment was devised. The electronic unit was designed using a high performance controller 80C552 and was provided with low-power transceivers for RS-232 and RS-485 communication with a PC. The results of the measured parameters are displayed using a graphic liquid crystal display, LCD G 242 C, that allows both graphics and character display. (authors)
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 212; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
; 1998; p. 212; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
[en] The presence of power corrections not accounted for by the standard Operator Product Expansion (OPE) of the QCD current correlation functions was very much discussed in the last time. An example is provided by the 1/Q2 corrections to the polarization function for massless quarks, which should not appear in the OPE since the first nonvanishing condensate has dimension D = 4. Various opinions have been formulated concerning the appearance of such terms in the Borel resummed perturbation theory. Therefore, a rigorous phenomenological analysis of power corrections is of much interest. In the present paper we undertake such an analysis, based on the new data on the spectral functions of the hadronic τ decays, obtained by the ALEPH Collaboration. Our main results are presented in a theorem whose equations provide a straightforward numerical algorithm allowing one to discuss the magnitude of the 1/Q2 power corrections of various Borel re-summations of perturbative QCD. (authors)
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900, Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900, Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 35; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900, Bucharest (RO); 5 ref.
; 1998; p. 35; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900, Bucharest (RO); 5 ref.
[en] A model Hamiltonian consisting of a triaxial rotator term and a linear combination of angular momentum components is treated both classically and quantum mechanically. In the classical picture one deals with the motion of one degree of freedom which depends on two parameters u, v. The parameters manifold is divided in several phases by separatrices, where the critical points of the Hamilton function, are degenerate. The equations of motion are exactly solved and alternatively treated by a linearization procedure. By quantizing the classical orbits, the semiclassical spectrum is obtained. The quantal Hamiltonian is treated by several methods and the resulting eigenvalues are compared with the semiclassical energies. The present formalism provides a unified description of several extreme models which were widely used in nuclear structure theory. The results can be used for studying the motion of two triaxial ellipsoids around an arbitrarily tilted cranking axis. New features concerning the magnetic as well as the electric properties of nuclear system are expected. (authors)
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900, Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900, Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 15; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900, Bucharest (RO); 7 refs.
; 1998; p. 15; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900, Bucharest (RO); 7 refs.
[en] A new thickness gauging method was worked out to eliminate certain drawbacks of the radiometric methods (e.g., measuring error dependency on the thickness and composition of materials, use of high activity sources). The method will prove itself, in many circumstances, more effective than gamma-ray methods and occurs as a good substitute for them. In this work the project of the experimental model for a transducer and computing system using electromagnetic radiation reflection for high-accuracy measurements of thickness was performed. As transducers, two laser displacement sensors, type Z4M-W40, equipped with a selecting controller are used. Acquisition and computing of the transducer signals are made by an electronic unit that uses a high performance controller 80C552 and was provided with low-power transceivers for RS-485 communication with a PC. The main thickness measurement parameters are: - Measurement error, 1%; - Linearity, 1% (for full scale); - Response time, 0.15 ms, 2 ms, 60 ms. (authors)
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 213; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
; 1998; p. 213; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Short communication
[en] In this work, the following entropies in quantum scattering are defined: the informational angular entropy, Sθ; Tsallis-like angular entropies, Sq(θ); the angular momentum entropy, SL; the Tsallis-like angular momentum entropies, Sq(L); the angle-angular momentum entropy, SθL. These entropies are defined as natural measures of the uncertainties corresponding to the distribution probabilities. If we are interested in obtaining a measure of uncertainty of the simultaneous realization of the probability distributions, than, we have to calculate the entropy corresponding to these distributions. The expression of angle-angular momentum entropy is given. The relation between the Tsallis entropies and the angle-angular momentum entropy is derived
Source
Alexa, Calin; Andries, Mihai; Badescu, Elisabeta (Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania)) (eds.) (and others); Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (Romania); 285 p; ISSN 1454-2714; ; 1998; p. 129; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); 3 refs.
; 1998; p. 129; Available from author(s) or from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); Available from Office of Documentation, Publication and Printing, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest (RO); 3 refs.
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