Mössbauer emission studies of Co-Mo/Al2O3 hydrodesulfurization catalysts: Effects of reduction and sulfidation treatments

The effect of the sulfiding temperature on the catalytic and structural properties of Co-Mo/Al₂O₃ catalysts is studied by taking into account the after-effects arising from 57-Co in the alumina. The catalytic activity is shown to be correlated to both MoS₂ or CoMoS and Co₉S₈ phases.     

Thermogravimetrie von Styrol—Chloranilcopolymeren

The thermal decomposition of styrene-chloranil copolymers is investigated by dynamic thermogravimetry. The decomposition occurs at relatively low temperatures and is correlated to the chemical structure of the polymers.

---

---

Mit 1 Abbildung     

Hallkoeffizient,spezifischer elektrischer Widerstand und magnetische Suszeptibilität flüssiger Hg-In-und Ga-In-Legierungen

The Hall coefficient and the magnetic susceptibility of the liquid alloys Hg-In and Ga-In have been measured and compared with the free electron model. The deviation of the measured from the calculated Hall coefficient for Hg-In is discussed. The susceptibility of carriers in Hg and Hg-In deviates strongly from the Pauli-Landau-susceptibility. This behaviour can be understood by assuming a minimum of the density of states at the Fermi level of Hg. The susceptibility data accounts for the Knight-shift ofSeymour andStyles. For liquid Ga-In, the Hall-coefficient and the magnetic susceptibility agree with the free electron model.     

A molecular orbital study of the bonding in complexes of lithium with polynuclear aromatic hydrocarbons

In a preliminary investigation of the bonding between the sub-lattices of lithium and of graphite in intercalation compounds, molecular orbital calculations are performed on systems of Li atoms complexed to one or both sides of polynuclear aromatic hydrocarbons. Energy wells calculated reveal possible sites offered to the Li atoms above the aromatic plane to form complexes in both central and edge regions of the molecule. The influence of additional complexed Li atoms on the migratory tendency of a given Li atom is also investigated, and observations made on the effect of the complexed Li atoms on the C-C bonds of the hydrocarbon.     

Impulsive optimal control with finite or infinite time horizon

We consider a dynamical system subjected to feedback optimal control in such a way that the evolution of the state exhibits both sudden jumps and continuous changes. Previously obtained necessary conditions (Ref. 1) for such impulsive optimal feedback controls are generalized to admit the case of infinite time horizon; this generalization permits application to a wider class of problems. The results are illustrated by application to a version of the innkeeper's problem.Dedicated to G. Leitmann     

Nuclear moments and charge radius changes in platinum isotopes

Isotope shift (IS) and hyperfine structure (HFS) measurements have been performed for^{185, 187, 189, 191, 195}Pt using the PILIS (Post ISOCELE Laser Isobar Separator) apparatus installed at the ISOCELE facility. Magnetic and quadrupole moments have been deduced from the HFS results. The charge radius changes determined for these odd nuclei from the IS results, added to the σ<r²> values of the even-A nuclei are compared to the results of lattice Hartree-Fock+BCS calculations for asymmetric solutions:¹⁸⁵Pt is confirmed to be prolate shaped whereas^{187, 189, 191}Pt are likely triaxial in their ground states.