Quantum event theory: A Tetrode-Fokker version of quantum field theory

This paper explores the possibility of an event interpretation of quantum field theory.Research performed during stays at Utrecht State University at the Institute for the History and Foundations of Science.     

Electroproduction of neutral pions and test of the quark-parton model

We present the first data on the inclusive structure function for π⁰-electroproduction. The data are compared to charged pion electroproduction and charged pion production from electron-positron annihilation taking the quark-parton model as a guide.     

Deperturbation of the N2+ first negative group B2Σu+-X2Σg+

Twelve bands of the N₂⁺B²Σ_u⁺-X²Σ_g⁺ system, including v_B = 0–6 and v_X = 0–8, are reanalyzed. All effects of B²Σ_u⁺ ～ A²Π_u perturbations are explicitly considered. Despite the use of high precision (0.01 cm^?1) line measurements, no evidence for a perturber other than A²Π_u is obtained. Deperturbed constants for the B²Σ_u⁺ and X²Σ_g⁺ states are derived. The deperturbation is shown to be self-consistent and complete (excluding effects of the C²Σ_u⁺ state) by examining semiempirical relationships of the perturbation matrix elements with the spin-rotation constants of the B and X states and atomic spin-orbit parameters. A number of previous analyses of transitions involving the v_B = 3 and 5 levels are found to be incorrect.     

Calculation of transition metal compounds using an extension of the CNDO-formalism

A recently developed extension of the CNDO-method is used to study the electronic structure of a number of binuclear transition metal carbonyls and carboxylates with fourfold or quasi-fourfold symmetry. The results are compared to those available from nonempirical calculations. Special attention is paid to the nature of the metal-metal bond. Connections with qualitative MO-considerations allow a fairly general discussion of metal-metal bonding in binuclear transition metal complexes with basic fourfold symmetry. A few, up to now unknown, but possibly existing, complexes are considered.     

Systematic analysis by solvent extraction methods : Part I. Qualitative analysis

A systematic scheme of separation by solvent extraction methods is described for 19 metals.     

Single crystal X-ray diffraction analysis of 2,3a,4,5-tetrahydro-7,8-dimethoxy-3a-methyl-3H-benz[g]indazol-3-one hemihydrate

The structure of 2,3a,4,5-tetrahydro-7,8-dimethoxy-3a-methyl-3H-benz[g]indazol-3-one hemihydrate was unequivocally established by means of an X-ray diffraction analysis of a single crystal. The molecule crystallizes in the space group C2/c with unit cell parameters of a = 18.839(4), b = 7.7694(7), c = 18.211(2) Å and β = 101.06(1). The structure was solved by direct methods and refined by least-squares methods to an R-value of 0.069 for 2689 reflections. The indazol-3-one unit of the molecule is non-planar.     

Subintuitionistic logics and the implications they prove

This is an investigation of the implications of IPC which remain provable when one weakens intuitionistic logic in various ways. The research is concerned with logics with Kripke models as introduced by G. Corsi in 1987, and others like G. Restall, Do?en, Visser. This leads to conservativity results for IPC with regard to classes of implications in some of these logics. Moreover, similar results are reached for some weaker subintuitionistic systems with neighborhood models introduced by the authors in 2016. In addition, the relationship between two types of neighborhood models introduced in that work is clarified. This clarification leads also to modal companions for weaker logics.     

Detonation diffraction from an annular channel

In this study, gaseous detonation diffraction from an annular channel was investigated with a streak camera and the critical pressure for transmission of the detonation wave was obtained. The annular channel was used to approximate an infinite slot resulting in cylindrically expanding detonation waves. Two mixtures, stoichiometric acetylene–oxygen and stoichiometric acetylene–oxygen with 70% Ar dilution, were tested in a 4.3 and 14.3 mm channel width (W). The undiluted and diluted mixtures were found to have values of the critical channel width over the cell size around 3 and 12 respectively. Comparing these results to values of the critical diameter (d _c ), in which a spherical detonation occurs, a value of critical d _c /W _c near 2 is observed for the highly diluted mixture. This value corresponds to the geometrical factor of the curvature term between a spherical and cylindrical diverging wave. Hence, the result is in support of Lee’s proposed mechanism [Lee in Dynamics of Exothermicity, pp. 321, Gordon and Breach, Amsterdam, 1996] for failure due to diffraction based on curvature in stable mixtures such as those highly argon diluted with very regular detonation cellular patterns.