Ueber das Atomgewicht des Palladiums

Ohne Zusammenfassung     

Mit der Einstellung der Titanosalfatl?sungen

Ohne Zusammenfassung     

Non-contact atomic force microscopy imaging of TiO2(100) surfaces

Atomically resolved non-contact fm mode atomic force microscopy images have been obtained from TiO₂(100) surfaces. The 1×1 surface is observed, as well as the 1×3 phase previously imaged with STM. The morphology of the latter reconstruction consists of (110) microfacets. An additional reconstruction with 1×3 symmetry is observed, which is assigned to a phase intermediate between the 1×1 and 1×3-microfacet terminations.     

A microscopic description of inelastic 12C scattering from 208Pb

Heavy-ion inelastic scattering is described microscopically by using an effective nucleon-nucleon interaction and RPA hole-particle wave functions. The relative cross sections for different multipoles can be sensitive to the range of the interaction. The strength is determined by fitting elastic scattering. The model is used to analyze 98 MeV ¹²C ions exciting ²⁰⁸Pb. The range required is shorter than that for the bare interaction between nucleons. Collective model fits are also presented for comparison.     

Applications of Mathematical Programming—Before,Now and After

Linear programming and its variants have been used for over 30 years, and during this time there have been technological and theoretical developments which have given the modeller enormous computer power and flexibility. Have these been matched in application—are the models being used?This paper attempts to look at the overall applied nature of linear programming—what has happened, what is happening and what is likely to happen. It draws on evidence from many sources including surveys, the literature and informal comments. The results indicate the growth in real application and power of the latest computer packages. However, there are still some problems remaining, and an attempt is made to highlight barriers to implementation.     

A shortest path algorithm in robotics and its implementation on the FPS T-20 hypercube

A broad class of problems involving the optimal control of robot arms can be formulated as dynamic programming problems whose structure is particularly attractive for parallel processing. For certain simple cost functions the dynamic programming formulation reduces to determining the shortest path through a network. This algorithm has been implemented on a Floating Point Systems' T-20 hypercube computer. An analysis of the performance of the algorithm provides several important insights into the interplay between problem size and the number of processors in a parallel computer. The results also underscore the potential for parallel computers in real-time control applications.This work was supported in part by the Office of Naval Research, Contract N 00014-86-K-0693.     

The infrared spectra of pyridine N-oxide complexes of transition metal perchlorates in relation to their structures

The infrared spectra of the complexes [M(pyO)₆](ClO₄)₂ (pyO = pyridine N-oxide; M = Mn, Fe, Co, Ni, Zn) are discussed. Assignments of v(M-O) and other significant vibrations are based on the band shifts induced by deuteration of the heterocyclic ring and the effects of metal ion substitution. Earlier spectroscopic evidence suggesting distortion from regular octahedral site symmetry is discounted by the far-infrared spectra. In agreement with recent crystallographic evidence for O_h site symmetry in these complexes, one infrared-active v(M-O) band is expected and observed. The effects on the spectra of structural distortion in the 6-coordinate Cu^II complex [Cu(pyO)₆](ClO₄)₂, reduced coordination number in the 4-coordinate complex [Cu(pyO)₄](C1O₄)₂, and increased cationic charge in the Ga^III complex [Ga(pyO)₆](C1O₄)₃are discussed.     

Measurements and Hauser-Feshbach analysis of the10B(16O,6Li)20Ne reaction

States in²⁰Ne were populated by the¹⁰B(¹⁶O,⁶Li) reaction, and levels were observed up to 11 MeV in excitation energy. Cross sections were measured at 7° (lab) for bombarding energies from 44.4 to 46 MeV in 400 keV intervals. The reaction appears to be predominantly due to compound nucleus formation, and good agreement was found between the measured cross sections and Hauser-Feshbach calculations, assuming the known spin values of²⁰Ne.