Homogenitätskriterien für festkörper analytische untersuchungen

Homogeneity is a relative characteristic of samples. Both the precision and the geometrical resolving power of the investigation procedure are decisive for the characterization of homogeneity. A relation is given between these procedural parameters and the characteristics of the samples. The relationship has been verified by investigations of various heterogeneous materials by means of electron-probe microanalysis.     

Exact summation of outer rainbow self-energy graphs in λφ2ϕ2 theory

We use momentum space techniques to sum the complete class of outer rainbow graphs contributing to the IPI two-point function in λφ²?² theory. The results are exact to all orders of λ and for all values of q². By working in momentum space, we avoid the ambiguities which arose in the configuration space treatment of earlier work. It is shown that the renormalized integral equation can be reduced to a Volterra equation with $\text{non}\text{-}\text{L}{}^2$ kernel. The solution is found to agree with the asymptotic results of our configuration space treatment. Properties of the solution such as uniqueness, cut-off dependence, relation to perturbation theory and anomalous ultraviolet behaviour are discussed.     

Simultaneous determination of temperature and OH-concentration in flames using high-resolution laser-absorption spectroscopy

The development of tunable cw dye lasers with an extremely narrow bandwidth of <20 MHz and high stability in frequency and amplitude, which operate in the wavelength region from 2800 to 3150 Å by frequency doubling, has made possible the quantitative proof of the presence of OH with high-resolution laser-absorption spectroscopy.A method is presented, which allows the simultaneous measurement of temperature and OH-concentration by tuning across a suitable rotational line.     

Wasser, Abwasser

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