[en] The principle of information coding by the brain seems to be based on the golden mean. For decades psychologists have claimed memory span to be the missing link between psychometric intelligence and cognition. By applying Bose-Einstein-statistics to learning experiments, Pascual-Leone obtained a fit between predicted and tested span. Multiplying span by mental speed (bits processed per unit time) and using the entropy formula for bosons, we obtain the same result. If we understand span as the quantum number n of a harmonic oscillator, we obtain this result from the EEG. The metric of brain waves can always be understood as a superposition of n harmonics times 2PHI, where half of the fundamental is the golden mean PHI (=1.618) as the point of resonance. Such wave packets scaled in powers of the golden mean have to be understood as numbers with directions, where bifurcations occur at the edge of chaos, i.e. 2PHI=3+phi³. Similarities with El Naschie's theory for high energy particle's physics are also discussed

[en] We report study of the stability of ultra-thin Al films deposited on GaAs(100) using positron annihilation induced Auger electron spectroscopy (PAES). After the sample was kept for 7 days at 300 K under UHV conditions, the normalized Al PAES intensity decreased by 33.7±4.6%. Over the same time period, the normalized Ga PAES intensity increased by 55.8±4.8%. PAES spectra provide a direct method of confirming the substitution of Ga for Al in the top layer and Ga diffuse into the Al overlayer faster than As

[en] This report describes a new method for monochromator energy calibration, which is based on the freedom to change the fix focus constant c_ff in the plane grating monochromator at BESSY. If the monochromator is not perfectly aligned, spectra taken at different c_ff-values show energy shifts (of 1-2%). These can be attributed to offsets in the grating angles. Measuring spectra at different c_ff-values, one can determine these offsets by employing a fitting procedure. If these offsets are inserted, c_ff variation measurements lead to relative energy scale changes of less than a few 10^-4

[en] The X-ray tube has got a tabular extension at the front end of which a W-shaped target is mounted. The target hit by electrons emits X-radiation passing through a ceramic window in the surface area. The extension can be inserted into the mouth opening of the patient. For holding down the tongue and for shielding purposes it has got a device shaped like a sleeve with diverging wings fastened to it. Thex leave the ceramic window uncovered. (orig.)

[en] Two experimental campaigns designed to study high-latitude auroral arcs have been conducted in Sonde Stromfjord, Greenland. The Polar Acceleration Regions and Convection Study (Polar ARCS) on February 26, 1987, consisted of a coordinated set of ground-based and sounding rocket measurements of a weak, sun-aligned arc within the duskside polar cap, while the Rodeo 1 and 2 experiments, conducted during December, 1988 and October, 1989, involved uniquely coordinated optical and radar measurements of high-latitude arcs occurring at the poleward boundary of the auroral oval. Analysis of the large-scale Polar ARCS data indicate anti-sunward convection in the region between the dusk-side auroral oval and the sun-aligned arc. This convection signature is consistent with either a model in which the sun-aligned arcs formed on open field lines over the polar cap or on closed field lines threading an expanded low-latitude boundary layer, but not a model in which the polar cap arc field lines map to an expanded plasma sheet. Electron measurements indicate that the rocket passed through three narrow (less than or equal to 20 km) regions of low-energy (less than or equal to 100 eV) electron precipitation. An electrodynamic analysis has shown the electric and magnetic field perturbations in these regions to be well correlated and associated with small-scale upward and downward field-aligned currents of 1-2 micro-A/sq m. The Rodeo measurements have been used to examine the aeronomic and electrodynamic characteristics of two optically stable arcs occurring at different magnetic local times and exhibiting different relationships to the polar cap/convection reversal boundary

[en] The low momentum K⁺ is the weakest of the available strongly interacting particles. It has a mean bee path in nuclear matter of about 6 fm which makes it a good probe for studying properties of the nuclear interior. It allows one to build a good microscopic optical potential which can be used to calculate K⁺ nucleus elastic and total cross sections. In the latter case the calculated ratio R_T=[σ_tot(K⁺ A)/A]/[σ_tot(K⁺ d)/2] can be expected to be more reliable because some uncertainties in K⁺N phase shifts will cancel. This ratio can also be measured more reliably than the total cross sections themselves because of cancellation of some systematic errors. We measured the total cross sections of K⁺ on D, ⁶Li, ¹²C, ²⁸Si and ⁴⁰Ca from 488 to 714 MeV/c. The emphasis was placed on extracting values of R_T with a precision of better than 2 percent. The total cross section ratios are found to lie significantly above those predicted by optical potential calculations with the usual nuclear medium corrections. This suggests that novel phenomena are taking place within the nucleus. Several models which incorporate such phenomena are discussed, including nucleon 'swelling', mass rescaling, nuclear pions, and relativistic effects. (author) 31 refs., 27 figs., 21 tabs.,

[en] The following topics were dealt with: Fundamentals of the thermochemical calculations, fundamentals of the experimental investigations, thermochemical description of the binary and ternary systems, experiments and discussion of the results: sample preparation, SAM analysis, XRD, phase relations

[en] As a result of the project, a concept was to be developed for managing spent fuel elements from research reactors on the basis of the interim storage technology existing in Germany, in order to make the transition to direct disposal possible in the long term. This final report describes the studies for the spent fuel management concept as well as the development of a transport and storage cask for spent fuel elements from research reactors. The concept analyses were based on data of the fuel to be disposed of, as well as the handling conditions for casks at the German research reactors. Due to the quite different conditions for handling of casks at the individual reactors, it was necessary to examine different cask concepts as well as special solutions for loading the casks outside of the spent fuel pools. As a result of these analyses, a concept was elaborated on the basis of a newly developed transport and storage cask as well as a mobile fuel transfer system for the reactor stations, at which a direct loading of the cask is not possible, as the optimal variant. The cask necessary for this concept with the designation CASTOR trademark MTR 2 follows in ist design the tried and tested principles of the CASTOR trademark casks for transport and interim storage of spent LWR fuel. With the CASTOR trademark MTR 2, it is possible to transport and to place into long term interim storage various fuel element types, which have been and are currently used in German research reactors. The technical development of the cask has been completed, the documents for the transport license as type B(U)F package design and for obtaining the storage license at the interim storage facility of Ahaus have been prepared, submitted to the licensing authorities and to a large degree already evaluated positively. The transport license of the CASTOR trademark MTR 2 has been issued for the shipment of VKTA-contents and FRM II compact fuel elements. (orig.)

No abstract available

No abstract available