Relationship between age and risk taking among managers.

Administered a short version of N. Kogan and M. Wallach's (see pa, vol. 39:6826) choice-dilemma test to 1,484 managers from over 200 companies. Results show a significant negative relationship between age and both risk taking and the value placed upon risk. The relationships were small in size when individual scores were correlated with age, but increased markedly when mean scores were used. Furthermore, the relationships were relatively stable across items and across companies. Developmental and sociocultural mechanisms that might underlie these findings are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ein neuer Weg zur quantitativen Erfassung der Vorgänge beim kontrollierten Walzen

Qualitative Ableitung der Größe ?addierte Endverformung“ und ihre quantitative Beschreibung über temperaturabhängige Additionskoeffizienten. Vorausberechnung von Streckgrenze und Festigkeit aus dem Stichplan. Berechnung eines Übergangspunktes der Kristallinität und hieraus Konstruktion der Kerbschlagzähigkeitskurve.     

Berechnung der Schmiedeguttemperaturen beim Reckschmieden

Aufteilung des Schmiedevorgangs in Abkühl- und Umformvorgänge. Wärmebilanzen für den Abkühl- und den Umformvorgang. Numerisches Lösungsverfahren. Auswertungen.     

Die Thermokraft von Aluminiumnitrid bei Temperaturen zwischen 1350 und 1650 °C in Argon- und Stickstoffatmosphäre

Beschreibung der Versuchsapparatur zur Messung der Thermospannung der Kette Rh |_{T + Δ} AIN |_T Rh für Temperatur-differenzen bis zu ± 60 °C zwischen 1350 und 1650 °C. Ermittlung der Thermokraft und ihres homogenen Anteils. Berechnung der Überführungswärme der wandernden Ionen aus der homogenen Thermokraft. Erörterung zum Leitungsmechanismus im Aluminiumnitrid AlN.     

L x-ray satellite energies

Theoretical energies are tabulated for the L x-ray satellites that arise from electric dipole and quadrupole transitions in the presence of one spectator hole in the M- or N-shell. Results are listed for 11 elements with atomic numbers 65 ≤ Z ≤ 95. The computations are relativistic and include quantum-electrodynamic corrections. Subsidiary tables list the Coulomb and Breit interaction energies for double-hole states and the relative x-ray intensities of double-hole multiplet states.     

A new spatiotemporal regularization approach for reconstruction of cardiac transmembrane potential patterns

The single-beat reconstruction of electrical cardiac sources from body-surface electrocardiogram data might become an important issue for clinical application. The feasibility and field of application of noninvasive imaging methods strongly depend on development of stable algorithms for solving the underlying ill-posed inverse problems. We propose a novel spatiotemporal regularization approach for the reconstruction of surface transmembrane potential (TMP) patterns. Regularization is achieved by imposing linearly formulated constraints on the solution in the spatial as well as in the temporal domain. In the spatial domain an operator similar to the surface Laplacian, weighted by a regularization parameter, is used. In the temporal domain monotonic nondecreasing behavior of the potential is presumed. This is formulated as side condition without the need of any regularization parameter. Compared to presuming template functions, the weaker temporal constraint widens the field of application because it enables the reconstruction of TMP patterns with ischemic and infarcted regions. Following the line of Tikhonov regularization, but considering all time points simultaneously, we obtain a linearly constrained sparse large-scale convex optimization problem solved by a fast interior point optimizer. We demonstrate the performance with simulations by comparing reconstructed TMP patterns with the underlying reference patterns.     

Pharmacokinetics of Gadomer-17, a new dendritic magnetic resonance contrast agent

Rationale and objectives: Gadomer-17 is a new magnetic resonance (MR) contrast medium presently in clinical development. It is a dendritic gadolinium (Gd) chelate carrying 24 Gd ions. This study investigated the pharmacokinetic behavior of this contrast medium. Methods: The pharmacokinetics of Gadomer-17 were investigated in different species (rat, rabbit, dog, monkey) for up to 7 days after intravenous (i.v.) injection of 25–100 μmol/kg body weight. In addition, elimination and biodistribution were evaluated after single i.v. injection of Gadomer-17 in rats. Results: After i.v. injection Gadomer-17 distributes almost exclusively within the intravascular space without significant diffusion into the interstitial space. The volume of distribution (Vc) in the initial or α-phase ranged from 0.04 1/kg (rats, rabbits) to 0.06 1 kg (monkeys) and 0.07 1/kg (dogs), which reflects mainly the plasma volume. The blood/plasma concentration profile was found to be biphasic. The volume of distribution at a steady state is clearly smaller than that of other contrast media, which distribute to the extracellular space. After single i.v. injection in rats, the dendritic contrast medium was rapidly and completely eliminated from the body, mainly via glomerular filtration. No long-term accumulation or retention of the nonmetabolized agent was detectable in organs or tissues. Conclusions: Gadomer-17 is a promising new MR contrast medium that has an intravascular distribution and a rapid renal elimination.