Apparat zur Fettextraction

Ohne Zusammenfassung     

Ueber die Beurtheilung von Glasgef?ssen zu chemischem Gebrauche. Die Einwirkung von Wasser auf Glas

Ohne ZusammenfassungDie folgende Experimentaluntersuchung wurde von den Verfassern im Auftrage der Physikalisch-technischen Reichsanstalt ausgeführt und in etwas knapperer Form bereits in der Zeitschrift für Instrumentenkunde 1891, S. 311 abgedruckt.     

Highly asymmetric coordination of trimethylsilyl groups to tetrazole and triazole rings: an experimental and computational study in gaseous and crystalline phases

1-Trimethylsilyltetrazole, 1, has been synthesised from chlorotrimethylsilane and tetrazole in the presence of triethylamine as an auxiliary base. The structure of this compound has been determined in the crystalline phase by X-ray diffraction of a crystal grown in situ. The gas-phase structures of 1 and 1-trimethylsilyl-1,2,4-triazole, 2, have been determined by gas-phase electron diffraction (GED). An extensive investigation of these and related compounds by ab initio calculations is also reported. The angles between the rings and the substituents on N were of particular interest. It was found that the calculated difference of 15.5 degrees between the CNSi and NNSi angles in 1 was mostly, but not entirely, an inherent property of the tetrazole ring and not due to a short SiN interaction.     

A new path integral representation of the Hubbard model at largeU/T

It is shown that atU/T1 the Hubbard model may be represented as a path integral with fields taking values in the graded complex projective space CP(2). This helps to disentangle the nonlinearities of this model.     

Quantum phase transitions in Bose-Einstein condensates from a Bethe ansatz perspective

We investigate two solvable models for Bose-Einstein condensates and extract physical information by studying the structure of the solutions of their Bethe ansatz equations. A careful observation of these solutions for the ground state of both models, as we vary some parameters of the Hamiltonian, suggests a connection between the behavior of the roots of the Bethe ansatz equations and the physical behavior of the models. Then, by the use of standard techniques for approaching quantum phase transition - gap, entanglement and fidelity - we find that the change in the scenery in the roots of the Bethe ansatz equations is directly related to a quantum phase transition, thus providing an alternative method for its detection.     

Zur Kenntniss des Lackmoids

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Nachweis von Pflanzen?len auf Grund ihres Phytosteringehaltes

Ohne Zusammenfassung