Funktionalkalküle für abgeschlossene lineare Operatoren in Banachräumen

The theory of A-scalar and generalized scalar operators of Colojoara and Foias [7] is generalized to unbounded closed operators. A spectral mapping theorem is proved for the (local) spectrum. Generalized scalar operators admit a calculus for, the C-functions on the C-manifold. B(C), the C-functions onC, which are bounded with all derivatives, is an other admissible algebra. If (T) is contained in a generalized circle, characterisations as in [7] and explicit expressions for the C^m(K)- and the B^m(R)-calculus are obtained.     

Halbsandwichkomplex des Chroms mit dem Trifluormethylisocyanid-Liganden

Halfsandwich Complexes of Chromium with the Trifluoromethyl Isocyanide Ligand The synthesis and properties of the halfsandwich complexes [η⁶-1,3,5-C₆H₃(CH₃)₃]Cr(CO)₂(CNCF₃), [η⁶-1,3,5-C₆H₃(CH₃)₃]Cr(CO)(CNCH₃)(CNCF₃) und [η⁶-1,3,5-C₆H₃(CH₃)₃]Cr(CNCF₃)₃ is reported. The vibrational spectroscopic data proof the strong π accepting character of the trifluoromethyl isocyanide ligand.     

Berechnung des Temperaturverlaufes in einer transpirationsgekühlten Rohrwand

Zusammenfassung Die Innenwandtemperatur eines transpirationsgekühlten Rohres, das einen Plasmabogen umgibt, kann experimentell nur mit sehr großen Schwierigkeiten bestimmt werden. Sie läßt sich jedoch aus auf einfache Weise zu messenden physikalischen Größen berechnen. Das Rechenverfahren wird erläutert und Rechenergebnisse werden diskutiert.

---

Calculation of temperature distribution in a transpiration cooled tube wall

Experimental determination of the inner wall temperature of a transpiration cooled tube surrounding a plasma arc is very difficult. This temperature, however, can be calculated from simply measurable physical quantities. The method is explained and results are discussed.

---

Bezeichnungen A =m-Bc _pG/2(1–p) _w - A _s Strahlungszahl - B =4P/mc _pG r _p - c _pG spez. Wärme des Gases - C =B(1+A) - C _s Strahlungszahl des schwarzen Körpers - f(r) =(B _r+1/r) - g(r) =(C–1/r ²) - m-B Massenstrom des Gases bezogen auf 1 cm Rohrlänge - P Porosität - q-A _L Wärmemenge, die pro cm Rohrlänge durch Leitung durch die Rohrwand hindurch transportiert wird - r Rohrradius - r _i Innenradius - r _a Außenradius - r _e Rohrradius, an dem alle Temperaturen bekannt sind - r _p Porenradius - t Gastemperatur - t _a Gastemperatur außerhalb des Rohres - T Rohrwandtemperatur - T _a Rohrwandtemperatur an der Außenfläche - T _i Rohrwandtemperatur an der Innenfläche - Wärmeübergangszahl - _w Wärmeleitzahl der Wand - _G Wärmeleitzahl des Gases Herrn Professor E. R. G.Eckert zur Vollendung seines 65. Lebensjahres gewidmet.     

On condensation mass transfer in the presence of noncondensables

An analysis is made for the influence of the moving condensate film on the mass transfer rate from the gas-vapor mixture to the condensate. The governing energy and mass conservation equations are solved using the Crank-Nicholson method. The results show that the moving condensate film may have a considerable effect on condensation mass transfer.     

Public understanding of science and the perception of nanotechnology: the roles of interest in science,methodological knowledge,epistemological beliefs,and beliefs about science

In this article, we report data from an online questionnaire study with 587 respondents, representative for the adult U.S. population in terms of age, gender, and level of education. The aim of this study was to assess how interest in science and knowledge as well as beliefs about science are associated with risk and benefit perceptions of nanotechnology. The findings suggest that the U.S. public is still rather unfamiliar with nanotechnology. Those who have some knowledge mainly have gotten it from TV and the Internet. The content of current media reports is perceived as fairly positive. Knowledge of scientific methods is unrelated to benefit and risk perceptions, at least when other predictors are controlled. In contrast, positive beliefs about science (e.g., its impact on economy or health) and more sophisticated epistemological beliefs about the nature of scientific knowledge are moderately linked to more positive perceptions of nanotechnology. The only exception is the perception of scientific uncertainty: This is associated with less positive evaluations. Finally, higher engagement with science is associated with higher risk perceptions. These findings show that laypersons who are engaged with science and who are aware of the inherent uncertainty of scientific evidence might perceive nanotechnology in a somewhat more differentiated way, contrary to how it is portrayed in the media today.