Zentrifugal-Chromatographie von Kationen

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Ma?analytische Kationenbestimmung mit ?DTA gegen Silberelektrode

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Bestimmung von Flockungspunkten bei nichtionischen Schaumerzeugern

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Zur Bestimmung von Vitamin D

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Bordismentheorie stabil gerahmterG-Mannigfaltigkeiten

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Search for delayed fission products from superheavy nuclei in the reaction136Xe+208Pb

The production of superheavy elements in binary reactions of the type²⁰⁸Pb (¹³⁶Xe, X) Y was investigated atE _c.m.=470 MeV. The experiment was designed to search for delayed fission products from elements withZ between 108 and 116 and fission lifetimes ofΤ?10^?12 s. No fission events were observed the upper limit for the formation cross section being 1.2 Μbarn.     

Lineare Silizium-Photodioden-Matrizen mit parallelem Datenausgang als Strahlungsempfänger in der optischen Emissionsspektroskopie—II. Analytische anwendung in verbindung mit der glimmentladungslampe nach Grimm

A silicon photodiode array was placed in the focal plane of a spectrometer to detect the radiation. Three single diodes of the array, each 6.5 mm long and 19 μm wide, were connected to the three channels as described in Part I.The properties of the photodiodes were investigated with respect to their applicability in spectral analysis. Especially the spectral response, the dynamic range and the signal-to-noise ratio were of great interest. The quantum efficiency was found to be in the range from 300 to 800nm. The dynamic range, defined as the range from the noise level to the maximum permissible signal voltage extends over 5.5 decades and is a linear function of the radiative flux. The signal-to-noise ratio of systems using photodiodes depends on the wavelength of the radiation and, if high feedback resistors (≧10¹¹Ω) are used, reaches the same order of signal-to-noise ratio as that obtained by using a photomultiplier (EMI 9789 QB). To demonstrate the applicability of the photodiodes, the analysis of limestone was studied. The sample powder was mixed with copper powder, pressed into pellets, and the major constituents Al, C, Mg and Si were determined by means of a Grimm glow discharge lamp. The calibration curves obtained as well as the detection limits are reported.Furthermore, oxygen was determined in a series of synthetic samples using the line 777.2 nm.     

Ionenaustausch in geschmolzenen Salzen

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Über das Geschlecht eines inseparablen Funktionenkörpers

Let K/k be an inseparable algebraic function field of one variable of genus g and characteristic p>0. By using constant field extensions it is shown that 2g≥p(p?3)+2 and g≡1(mod p) (for p≠2). Indeed, there exist inseparable function fields with 2g=p(p?3)+2. Moreover we prove that there is a least constant field extension 1 of k such that L=Kl is separable over 1.