1000 resultados para 1995_01202302 TM-36 4301703


Relevância:

20.00% 20.00%

Publicador:

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Vorbesitzer: Karmeliterkloster Frankfurt am Main

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The design of upconversion phosphors with higher quantum yield requires a deeper understanding of the detailed energy transfer and upconversion processes between active ions inside the material. Rate equations can model those processes by describing the populations of the energy levels of the ions as a function of time. However, this model presents some drawbacks: energy migration is assumed to be infinitely fast, it does not determine the detailed interaction mechanism (multipolar or exchange), and it only provides the macroscopic averaged parameters of interaction. Hence, a rate equation model with the same parameters cannot correctly predict the time evolution of upconverted emission and power dependence under a wide range of concentrations of active ions. We present a model that combines information about the host material lattice, the concentration of active ions, and a microscopic rate equation system. The extent of energy migration is correctly taken into account because the energy transfer processes are described on the level of the individual ions. This model predicts the decay curves, concentration, and excitation power dependences of the emission. This detailed information can be used to predict the optimal concentration that results in the maximum upconverted emission.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Welsch (Projektbearbeiter): Aufruf von 14 Urwählern des Berliner 71. Bezirks, nur solche Wahlmänner zu wählen, die den Staatsstreich des 9. November 1848 (Verlegung der Nationalversammlung nach Brandenburg) wieder rückgängig machen und eine Verfassung schaffen, welche im Unterschied zu der vom 5. Dezember 1848 kein Gnadengeschenk darstellt

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Welsch (Projektbearbeiter): Zurückweisung eines ungarischen Ausbruchsversuches aus der belagerten Festung Komorn

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Heinrich Graetz

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Vorbesitzer: Dr. Becker; Arthur May; Städt. Historisches Museum Frankfurt am Main

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Vorbesitzer: Bartholomaeusstift Frankfurt am Main

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Trägerband: "Hauptschießen mit dem Stahlbogen... 1573 u. 1578"; Vorbesitzer: Stadtarchiv Frankfurt am Main

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Vorbesitzer: Jakob Heller; Dominikanerkloster Frankfurt am Main

Relevância:

20.00% 20.00%

Publicador:

Resumo:

15 Brief zwischen Heinrich Meng und Max Horkheimer sowie Briefwechsel mit The Johns Hopkins Hospital, Baltimore Maryland, 1935-1940; 4 Briefe zwischen dem The Johns Hopkins Hospital, Baltimore, Maryland und Max Horkheimer, 1940; 1 Brief von Werner Münsterberger an Max Horkheimer, 13.03.1940; 44 Briefe zwischen Karl Menninger vom The Menninger Clinic, The Menninger Sanatorium, Topeka, Kansas und Max Horkheimer, 1938-1941;

Relevância:

20.00% 20.00%

Publicador:

Resumo:

u.a.: Studium der Mathematik und Naturwissenschaften an der Universität Halle; Student bei Leo Erdmann und Friedrich August Tholuck; Studium der Philosophie; Parerga und Paralipomena;

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Trägerband: Inc. oct. 407; Vorbesitzer: Dominikanerkloster Worms; Dominikanerkloster Frankfurt am Main