Realizing characteristic classes by manifolds

Let BG be the classifying space for stable spherical fibrations, and let V be a finite dimensional vector subspace of the cohomology algebra H¹(BG; $\text{Z}$₂). We prove that V may be realized by a Poincaré duality space P, which means that if v:P→BG is the Spivak fibration, then v¹ maps V isomorphically onto its image in H¹(P;$\text{Z}$₂). By construction, P is the product of a certain Grassman manifold and a spherical fiber space over a closed smooth manifold.     

A search for neutrino oscillations

We present here the final results of experiments searching for neutrino oscillations, carried out by the CHARM Collaboration. The data — taking took place in 1983. The first experiment was performed by exposing two detectors simultaneously to the CERN PS low energyv _µ beam. In the second experiment the full CHARM detector was exposed to the wide-band horn-focusedv _µ beam of the CERN SPS. Complete details of the experiments and data reduction are presented. No statistically significant signals for neutrino oscillations were observed. Our 90% CL limits in the appearance experiment (v _µ→v _e ) exclude Δm ²≧0.19 eV² for complete mixing (sin²2θ=1), and sin²2θ≧0.008 for the region Δm ²≧30 eV². These results, and the limits observed for (v _µ→v _x ) (disappearance of (v _µ), are in agreement with those of most other experiments but exclude part of the region previously reported as a possible indication ofv _µ→v _e oscillations.     

Capillar-gas-chromatographische Bestimmung von Nitroglycerin in Plasma

Ohne Zusammenfassung

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Capillary gas-chromatographic determination of glycerol trinitrate in plasma

     

Slope of the log plot of adjusted retention time against carbon number for various homologues serices

Summary The slope of the log plot of the adjusted retention time of a homologous series usually varies from that of the n-alkane series by no more than 2%, though with unusual interactions between the functional group and the stationary phase the difference may be as high as 7%.     

Über eine Klasse von Trinomen

Ohne Zusammenfassung     

Eine praxisorientierte Bestimmung der Nachweisgrenze

Zusammenfassung Am Beispiel der Spurenanalyse von Quecksilber in biologischem Material wird eine Methode zur Bestimmung der Nachweisgrenze vorgeschlagen, die die Nachweisgrenze als geringsten, mit einer bestimmten Präzision meßbaren Gehalt auffaßt und unter Anwendung einfacher statistischer Kalküleals solche ermittelt.

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A practice-orientated determination of the limit of detection

Summary Illustrated by mercury trace analysis in biological material, a method for determining the limit of detection is proposed. It interpretes limit of detection as lowest content measurable with a certain precision and ascertains itas such applying simple statistical calculus.