Suche
Anzeige der Dokumente 1671-1680 von 1951
Aufsatz
Redox reactions of group 5 elements, including element 105, in aqueous solutions
(1992)
Standard redox potentials E^0(M^z+x/M^z+) in acidic solutions for group 5 elements including element 105 (Ha) and the actinide, Pa, have been estimated on the basis of the ionization potentials calculated via the multiconfiguration Dirac-Fock method. Stability of the pentavalent state was shown to increase along the group from V to Ha, while that of the tetra- and trivalent states decreases in this direction. Our estimates have shown no extra stability of the trivalent state of hahnium. Element 105 should form ...
Aufsatz
Quadrupole moments of radium isotopes from the 7p^2P_3/2 hyperfine structure in Ra II
(1989)
The hyperfine structure and isotope shift of ^{221- 226}Ra and ^{212, 214}Ra have been measured in the ionic (Ra 11) transition 7s^2 S_{1/2} - 7p ^2 P_{3/2} (\lamda = 381.4 nm). The method of on-line collinear fast-beam laser spectroscopy has been applied using frequency-doubling of cw dye laser radiation in an external ring cavity. The magnetic hyperfine fields are compared with semi-empirical and ab initio calculations. The analysis of the quadrupole splitting by the same method yields the following, improved values ...
Aufsatz
Thermodynamic functions of element 105 in neutral and ionized states
(1994)
The basic thermodynamic functions, the entropy, free energy, and enthalpy, for element 105 (hahnium) in electronic configurations d^3 s^2, d^3 sp, and d^4s^1 and for its +5 ionized state (5f^14) have been calculated as a function of temperature. The data are based on the results of the calculations of the corresponding electronic states of element 105 using the multiconfiguration Dirac-Fock method.
Aufsatz
Solution of the Hartree-Fock-Slater equations for diatomic molecules by the finite-element method
(1988)
We present the finite-element method in its application to solving quantum-mechanical problems for diatomic molecules. Results for Hartree-Fock calculations of H_2 and Hartree-Fock-Slater calculations for molecules like N_2 and CO are presented. The accuracy achieved with fewer than 5000 grid points for the total energies of these systems is 10^-8 a.u., which is about two orders of magnitude better than the accuracy of any other available method.
Aufsatz
Influence of occupation number of single particle levels on K - K charge transfer in collisions of 90 keV - Ne{^9+} on Ne
(1991)
The influence of the occupation of the single particle levels on the impact parameter dependent K - K charge transfer occuring in collisions of 90 keV Ne{^9+} on Ne was studied using coupled channel calculations. The energy eigenvalues and matrixelements for the single particle levels were taken from ab initio self consistent MO-LCAO-DIRAC-FOCK-SLATER calculations with occupation numbers corresponding to the single particle amplitudes given by the coupled channel calculations.
Aufsatz
Characterisation of the lactation curve of Gyr and Sardo Negro cattle
(2023-07)
The objectives were to characterize the lactation curves (LC) of tropical Gyr and Sardo Negro (SN) cattle from Mexico for the design of breeding and management programs for these breeds. A total of 3561 records of 504 lactations and 3927 records of 449 lactations were used for Gyr and SN, respectively. Three lactation lengths (LL) were evaluated, namely 240 (240d), 270 (270d), and 300 (300d) days, with five non-linear models (NLM): Wood, Wiltmink, Cobby, Brody, and Sikka. Milk production was obtained at the beginning ...
Aufsatz
Pyrolytic transformation of indigenous biomass wastes into biochar: an insight into char structure and physicochemical characteristics
(2022-08-20)
Biochar, the product obtained by the pyrolysis of organic materials with little or no available air, acts as a longterm recalcitrant source of organic carbon when applied to soil. In the present study an in-farm method has been standardized for the pyrolytic conversion of four indigenous biomass resources into biochar. The biomass feedstocks viz. bovine bone (BB), coconut shell (CS), rubberwood (RW) and water hyacinth (WH) were dried and subjected to proximate, ultimate, biochemical analysis and were subjected to ...
Aufsatz
Merkmale "guter Supervision"
(2000)
Als Merkmale "guter Supervision" wurden in einer empirischen Studie vor allem die strikte Aufgabenorientierung der Supervisoren, die umfassende sozialwissenschaftliche Fundierung ihrer Interventionen, ihre Triangulierungskompetenz und die Ressourcenorientierung herausgearbeitet. Den Supervisionsexperten gelingt es, die Abstinenz in der Supervision und die Handhabung von Übertragung und Widerstand feldspezifisch und gegenstandsangemessen zu variieren. Erfolgreiche Supervisoren, so ließ sich zeigen, vereinen Fähigkeiten ...
Aufsatz
Der Arbeitsplatz Gefängnis
(1997)
Die Besonderheiten des Arbeitsplatzes Gefängnis werden auf dem Hintergrund einer Institutionsanalyse dieser totalen Institution betrachtet. Die gesellschaftliche Funktion des Gefängnisses, die Rolle der Bediensteten und die Spezifik des Klientels werden zum tieferen Verständnis der Problematik dieses psychosozialen Arbeitsfeldes dargestellt. Die Funktion und die Besonderheiten der Übertragungen von Bediensteten, Gefangenen und der Gesellschaft als Ganzes auf die Institution Gefängnis werden beleuchtet, um für ...
Aufsatz
Supervision in der Justizvollzugsanstalt
(2001)
Der Aufsatz lädt die Leser ein, zunächst einmal die Organisationskultur einer Justizvollzugsanstalt (JVA) kennenzulernen und in einem zweiten Schritt das besondere Aufgabenprofil für unterschiedliche supervisorische Settings in dieser Institution zu sehen. In einem dritten Schritt schließlich werden die Möglichkeiten ausgeleuchtet, die dem Interventionsinstrument Supervision innerhalb der Verwaltungsreform der Berliner Justiz zukommen, dem sogenannten "New Public Management'.