Möglichkeiten der substöchiometrischen Ag-Spurenbestimmung mittels Mikroliterarbeitstechnik

Es wurde der Versuch unternommen, eine substöchiometrische Bestimmungsvariante für die extractive Ag-Bestimmung mit Zndibenzyldithiocarbamat zu finden. Die Methode sollte einfach und automatisierbar sein und folgende zwei Bedingungen erfüllen:

• –Erniedrigung der Nachweisgrenze durch Venwendung trāgerarmer Radionuklide

• – Verwendung kleinstmöglicher Aktivitäten

Dies wurde erreicht durch Minimierung des Arbeitsvolumens.

Über Probleme und erste Ergebnisse wird berichtet.     

Röntgenstreuung in Körpern mit regelloser Struktur

It is shown how small angle scattering can be used to get information on the gross structure of a medium with non-crystalline matter distribution. Explicit formulae are derived for the special case of a gel with hole structure, where X-ray analysis will be appropriate. The scattering intensity is expressed in terms of a correlation functionC (r) which determines, byC′(0), the specific surface of the gel. If the hole sizes are random, the correlation function takes on the analytic form of a simple exponential, containing a correlation length a. This correlation length can be measured directly by observing the angular distribution of the scattering intensity.     

Störungstheoretische Approximation für beliebige Störzeiten

A quantum theoretical perturbation approximation is developed which, in contrast to the usual method, is not restricted to a final time interval. The calculation is applied to n-quantum transitions between the spin-Zeeman levels of protons.     

Schrödinger's cat

The issue is to seekquantum interference effects in an arbitrary field, in particular in psychology. For this I invent a digest of quantum mechanics over finite-n-dimensional Hilbert space. In order to match crude data, I use not only von Neumann's mixed states but also a parallel notion of unsharp tests. The mathematically styled text (and earlier work on multibin tests, designated MB) deals largely with these new tests. Quantum psychology itself is only given a foundation. It readily engenders objections; hence I develop its plausibility gradually, in interlocking essays. There is also the empirically definite proposal that (state, test, outcome)-indexed counts be gathered to record data, then fed to a matrix format (MF) search for quantum models. A previously proposed experiment in visual perception, which has since failed to find significant quantum correlations, is discussed. The suspicion that quantum mechanics is all around us goes beyond MF, and Schrödinger's cat symbolizes this broader perspective.     

Über Magnetisierung und Feld stabförmiger Körper

The scintillation response of anthracene crystals to positrons and electrons is investigated in the energy region below 200 kev and is found to be linear within experimental error, with an intercept on the energy axis of a few kev, depending on size and surface conditions of the crystal. The light yield of positrons might be slightly below that of electrons, but the difference is less than about 2%.     

Mössbauer and optical spectrometry of selected schörl-dravite tourmalines

Spectrometric studies were carried out on samples of tourmaline (schörl-dravite series) from geological environments where first-phase-formed tourmaline underwent influence of geochemically different fluids. Samples are from a differentiated magmatic complex of Trento-Alto Adige, Italy, and from hydrothermal gold and silver deposits of the Humboldt Range, Nevada, USA. Chemical data were obtained from electron microprobes. The results of Mössbauer measurements suggest three to five doublets. Fe occurs in two valence states. The Z-site, usually fulfilled with Al³⁺ and Fe³⁺, is assigned only to Al³⁺ and Fe²⁺. This location was found in nearly all samples studied. In the Y-site Fe²⁺ and Fe³⁺ are obviously present. Isomer shifts with intermediate values can be assumed to be related to intervalence charge transfer (IVCT). Optical spectroscopy reveals absorption bands at 9 000 and 14000 cm^–1, which are assigned to a charge transfer between Fe²⁺ and Fe³⁺, the 23 000 cm^–1 absorption band is supposed to be due to Fe²⁺ Ti⁴⁺ charge transfer. The occupation of the Z-site only by Fe²⁺ and the coexistence of divalent and trivalent Fe in the Y-site could be explained by selective oxidation in Y-site through a late process.     

Mössbauer spectroscopy of samples from the 2010 Fimmvörðuháls/Eyjafjallajökull eruption

Mössbauer spectra of samples from the 2010 Fimmvörðuháls/Eyjafjallajökull eruption are presented with determinations of the Fe^3?+?/Fe_Tot ratios. Mössbauer spectra of time series of samples from the Eyjafjallajökull eruption show a change in the characteristics of the erupted material mid-way in the eruption, suggesting changing access of water to the eruption.     

The Schrödinger-HJW Theorem

A concise presentation of Schrödinger's ancilla theorem (Proc. Camb. Phil. Soc. 32, 446 (1936)) and its several recent rediscoveries.