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Institute
Rahmenbedingungen für eine Breitbandoffensive in Deutschland : Studie für die Deutsche Telekom AG
(2005)
Inhalt:
Carolin Schulz: „Ein scharfsinniger Kopf aus Berlin!“ Ein unveröffentlichtes Empfehlungsschreiben für Leopold von Buch
- Carolina Depetris: El orientalismo como episteme: Frédéric de Waldeck y las ruinas mayas
- Ottmar Ette: Réflexions européennes sur deux phases de mondialisation accélérée chez Cornelius de Pauw, Georg Forster, Guillaume-Thomas Raynal et Alexandre de Humboldt
- Eberhard Knobloch: Nomos und physis – Alexander von Humboldt und die Tradition antiker Denkweisen und Vorstellungen
Miguel-Ángel Puig-Samper, Sandra Rebok: Charles Darwin and Alexander von Humboldt: An exchange of looks between two famous naturalists
- Georg Schifko: Jules Vernes literarische Thematisierung der Kanarischen Inseln als Hommage an Alexander v. Humboldt
- Antonio Carlos Vitte, Roberison Wittgenstein Dias de Silveira: Alexander von Humboldt y la génesis de la geografía física moderna
- Ingo Schwarz: Eine Alexander-von-Humboldt-Forscherin mit Profil: Ilse Jahn (1922-2010)
- Romy Werther, Ingo Schwarz: Ilse Jahn: Schriften zur Alexander-von-Humboldt-Forschung – Eine Auswahlbibliographie
- Ilse Jahn: Die anatomischen Studien der Brüder Humboldt unter Justus Christian Loder in Jena
Reproducibility is a defining feature of science, but the extent to which it characterizes current research is unknown. We conducted replications of 100 experimental and correlational studies published in three psychology journals using high-powered designs and original materials when available. Replication effects were half the magnitude of original effects, representing a substantial decline. Ninety-seven percent of original studies had statistically significant results. Thirty-six percent of replications had statistically significant results; 47% of original effect sizes were in the 95% confidence interval of the replication effect size; 39% of effects were subjectively rated to have replicated the original result; and if no bias in original results is assumed, combining original and replication results left 68% with statistically significant effects. Correlational tests suggest that replication success was better predicted by the strength of original evidence than by characteristics of the original and replication teams.
In this study we report the structure of supercritical H2O-SiO2 fluid composed of 50 mol% H2O and 50 mol% SiO2 at 3000 K and 2400 K. investigated by means of ab initio molecular dynamics of models comprising 192 and 96 atoms. The density is set constant to 138 g/cm(3), which yields a pressure of 4.3 GPa at 3000 K and 3.6 GPa at 2400 K. Throughout the trajec[ories, water molecules are formed and dissociated via the network modifying reaction 2 SiOH = SiOSi + H2O The calculation of the reaction constant K- [OH](2)/[H2O][O2-] is carried out on the basis of the experimentally relevant Q ' species notation and agrees well with an extrapolation of experimental data to 3000 K. After quench from 3000 K to 2400 K, the degree of polymerization of the silicate network in the 192-atom models increases noticeably within several tens of picoseconds, accompanied by release of molecular H2O. An unexpected opposite trend is observed in smaller 96-atom models, due to a finite size effect, as several uncorrelated models of 192 and 96 atoms indicate. The temperature-dependent slowing down of the H2O-silica interaction dynamics is described on the basis of the bond autocorrelation function. (C) 2016 Elsevier B.V. All rights reserved.