Untersuchung von Braunoxidkatalysatoren mit Hilfe des MÖSSBAUER-Effektes

The pre-use state of industrial α-Fe₂O₃/Cr₂O₃ CO-conversion catalysts of known activity has been investigated by means of MÖSSBAUER effect and BET measurements. The iron of various catalyst samples has been found at room and catalytic reaction temperature (330°C) to be as well in the antiferro- as in the paramagnetic state, the ratio of both states being strongly dependent on temperature and on the specific catalyst sample. As the main reason for the occurrence of these two states within each sample the simultaneous occurrence of differently sized powder particles may be supposed. The ratio difference between one and another sample is due to differing chemical composition and grain size. Since no correlation was found between these resulats, BET surface data, grain size distribution and/or catalytic activity, pore structure differences are assumend to explain the observed differences in sample activity.     

On the width-length inequality

This paper was written at the Rensselaer Polytechnic Institute in 1963. A lecture based on it was given at the Rand Corporation in 1965 and this version is in the form in which Ray Fulkerson received it at Rand.The paper is the underpinning for results on resistor network inequalities (Reference [4]) which has not been published. A specific example, however, appears inProceedings of the IEEE 51 (1963) 1047–1048.More is known about minimal non-W—L matrices. U. Peled has found several additional classes of matrices which are also classically known in other contexts. A consequence of a recent matrix theorem is apparently that the degenerate projection planes are the only minimal matrices requiring unequal weights.The preparation of this paper was supported by the National Science Foundation under grant GP-14. Editor's Note: This paper, although written in 1963, was sought for inclusion inMathematical Programming Study 8—Polyhedral Combinatorics, which was dedicated to the memory of D.R. Fulkerson. Unfortunately, an editorial mishap prevented its inclusion. Nevertheless, the historical importance of the paper, the fact that it has been widely referenced and influenced Fulkerson's and others' work in the area has convinced the Editor that it should be published and hence made readily available. Alfred Lehman has given his assent to this despite his reluctance to publish a paper which is not current.