Asymptotic Normalization Constants in Nuclear Astrophysics

The indirect method of determining astrophysical nuclear reaction rates is discussed. The overall normalization of the astrophysical S-factor for such reactions may be determined from one quantity, the asymptotic normalization coefficient of the overlap function of the bound state wave functions for the initial and final channels. These coefficients can be found also from peripheral transfer reactions whose amplitudes are determined by the same overlap function as the amplitudes of the corresponding astrophysical radiative capture processes. The experimental test of this approach and the last results of S₁₇ measurements are presented.     

Classical Projections of Quantum Mechanics and the Limit ħ → 0

The convergence of the dynamics of classical projection to the dynamics of the classical limit is investigated for 0. A mistake from a previous paper is pointed out, and the correct version of the result is given. A new, similar result is presented if the function generating the Hamiltonian of both the classical projection and the classical limit is a polynomial.     

Pseudoeffect Algebras. II. Group Representations

This paper is the continuation of the previous paper by Dvureenskij and Vetterlein (2001), Int. J. Theor. Phys. 40(3). We show that any pseudoeffect algebra fulfilling a certain property of Riesz type is representable by a unit interval of some (not necessarily Abelian) partially ordered group. The relation of pseudoeffect to pseudo-MV algebras is made clear, and the &ell-group representation theorem for the latter structure is re-proved.     

Cr:Tm:Ho:YAG (2.1 μm) and Nd:YAG (1.444 μm) pulsed-laser lithotripsy of bile duct stones

The Nd:YAG (1.444 m) and Cr:Tm:Ho:YAG (2.1 m) free-running laser systems of the output energy of 300 mJ per pulse and repetition rate 1 Hz have been developed and used for bile duct stones fragmentation study in vitro. A total of 67 human bile duct stones of known sizes, collected from surgical sources were used in the experiments. Insensitivity of the stones fragmentation to the type of the laser used, and insensitivity of the fragmentation efficiency to the type of stone, was observed. No pathological changes of the tissue were observed for non-human soft tissue laser irradiation (in vitro) by 1, 2, and 5 pulses of the Cr:Th:Ho:YAG radiation of the fluency of 1.6 J/cm². The lasers are found to be good candidates for laser lithotripsy.     

Evolution on Z-pinch in argon-filled capillary

A capillary plasma Z-pinch as an alternative active medium of soft X-ray lasers was studied experimentally and theoretically. The theoretical analysis was based on the self-consistent solution of the so called snow-plow model of plasma pinch together with feeding double-resonance circuit. The calculated development of the current as well as the evaluated pinch time are in good agreement with the measured ones. The experimental pinch time was evaluated from the time-resolved measurement of broad band soft X-ray emission.     

Point defects on (−π)-wedge disclination in nematics

The structure of a point defect in the director field near (–)-wedge disclination line singularity in a thick sample of a nematic liquid crystal is approximately described. The elastic interaction energy of two point defects of the opposite sign is evaluated. There is always the attraction between two opposite point defects, as expected. Nevertheless, with the defect separation their attraction force decreases. When the attraction force is of the same order as a viscous force acting against a free molecular rotation, the movement of point defects is very slow. For example, the defect separation at which the relative velocity of point defects is about 0.025 m/day was estimated as 160 m.     

Algorithms for Greechie Diagrams

We give a new algorithm for generating Greechie diagrams with arbitrary chosennumber of atoms or blocks (with 2, 3, 4, . . . atoms) and provide a computerprogram for generating the diagrams. The results show that the previous algorithmdoes not produce every diagram and that it is atleast 10⁵ times slower. We alsoprovide an algorithm and programs for checking Greechie diagram passage byequations defining varieties of orthomodular lattices and give examples fromHilbert lattices. We also discuss some additional characteristics of Greechiediagrams.     

On Observables

We propose a simple set-theoretic model of a generalized probability spaceadmitting intrinsic incompatible events and incompatible observables. It is acoproduct in the category D of D-posets and D-homomorphisms each factor ofwhich is a classical Kolmogorovian probability space. Since classical events,random functions, and probability measures can be treated within D in a canonicalway, the Kolmogorovian model becomes a special case. We show that -additivityand other -notions can be replaced in a natural way by sequential continuity.     

Controlled growth of nanocrystalline silicon on permalloy micro-patterns

Lithographically prepared micrometer-sized permalloy ellipses were used to control the growth of nanocrystalline Si in otherwise amorphous Si film prepared by plasma enhanced chemical vapor deposition. Atomic force microscopy and micro-Raman spectroscopy were employed to study the surface structures before and after the deposition of the Si film. The possible applications of the controlled growth of nanocrystalline Si micro-patterns are discussed as well as the mechanisms leading to the growth of these patterns. PACS 68.55.Ac; 81.15.Gh     

High-power pulsed diode-pumped Er:ZBLAN fiber laser

We report on the operation and performance of a gain-switched Er:ZBLAN fiber laser based on an active pulsed diode pump system. The produced laser pulses offer high peak powers while retaining the high average powers and efficiency of the cw regime. The measured pulse duration was about 300 ns and nearly independent of the pump repetition frequency. The maximum obtained 68 W of peak power is the highest reported, to our knowledge, for diode-pumped Er:ZBLAN fiber lasers, and the 2 W of average power at the repetition frequency of 100 kHz is 2 orders of magnitude higher than previously reported average power in a pulsed regime. The obtained slope efficiency was 34%.