383 research outputs found
Anomalous population of He states in reactions with Li
Structure with the lowest energy observed in the He spectrum populated
in the proton knockout reaction with Li beam has a peak at
MeV. This peak is usually interpreted as a resonant ground state of
He. Our theoretical calculations indicate that this peak is likely to be
a pileup of , , and excitations with very similar shapes. %We
predict a very specific nature of the excitation in He. Moreover,
the ``soft'' excitation appears to be the lowest one in energy. Such an
anomalous continuum response is traced to the halo structure of Li
providing extreme low energy shift to all the expected continuum excitations.
Competitions of the initial state structure (ISS) and the final state
interaction (FSI) effects on the spectrum and three-body correlations in
He are discussed. Analogous effect of the extreme low-energy shift could
also be expected in other cases of emitters populated in reactions with
halo nuclei. Simplified example of the He spectrum in knockout
from Be, is given. We also discuss limits on the properties of He
stemming from the observed He spectrum.Comment: 10 pages, 13 figure
Updated analysis of NN elastic scattering to 3 GeV
A partial-wave analysis of NN elastic scattering data has been updated to
include a number of recent measurements. Experiments carried out at the Cooler
Synchrotron (COSY) by the EDDA Collaboration have had a significant impact
above 1 GeV. Results are discussed in terms of the partial-wave and
direct-reconstruction amplitudes.Comment: 16 pages, 14 figures, 2 tables; Fig 10 error corrected; Accepted for
publication in Physical Review
Модель механізму антикризового управління в адміністративно-територіальному утворенні
The model of the crisis-mechanism for administrative-territory unit is descript including aim-setting, projects of the risk-oriented strategy formation, the structure institutionalization of the crisis-assignment, crisis-management during strategy realization, diagnostic and identification of the crisis-threats. The approach to management for the system of the strategy realization based on the crisis-group creation, which exist on dual virtual-real status. The approach delivers such differs: accented proactive management; integration of the strategic and crisis functions without the special institution creation; the matrix structure integrates the functional and aimed activity; adaptively opportunities; stimulate of the project management implementation; opportunities to create the inter-organizational crisis-cell under crisis-threat..Описано модель механізму антикризового управління в адміністративно-територіальному утворенні, яка включає процеси цілепокладання, формування проектів ризик-орієнтованої стратегії, структурну інституціоналізацію антикризової відповідальності, управління ризиками на етапах реалізації стратегії, діагностику та ідентифікацію кризових небезпек. Підхід до побудови системи управління реалізацією стратегії передбачає створення кризових груп, які можуть існувати у подвійному віртуально-реальному режимі, і має такі принципові ознаки: виражений проактивний характер; інтеграція стратегічних та антикризових функцій без створення спеціальної антикризової структури; матрична структура вправління поєднує функціональну і цільову діяльність; гнучкість; сприяння упровадженню проектного підходу; можливість в умовах кризової ситуації розгорнути міжорганізаційну мережу кризового управління
Model of the mechanism of crisis management in the administrative-territorial entities
The model of the crisis-mechanism for administrative-territory unit is descript including aim-setting, projects of the risk-oriented strategy formation, the structure institutionalization of the crisis-assignment, crisis-management during strategy realization, diagnostic and identification of the crisis-threats. The approach to management for the system of the strategy realization based on the crisis-group creation, which exist on dual virtual-real status. The approach delivers such differs: accented proactive management; integration of the strategic and crisis functions without the special institution creation; the matrix structure integrates the functional and aimed activity; adaptively opportunities; stimulate of the project management implementation; opportunities to create the inter-organizational crisis-cell under crisis-threat
Refinements to the microwave waveguide material parameters measurements. Case study
This work presents the results of experimental measurements of permittivity and permeability of materials (dried pine, paraffin, acrylic resin, bitumen, polypropylene and texolite) that has a comparative values. The laboratory installation compile from waveguides 23x10 mm that provides the frequency range 8-12 GHz. The results processing lay not only in comparison with the existing data, but also in investigation of physical conditions that should be taken into account for waveguide experiment setup. The main aim is to establish the variation of electro physical parameters of the material measured in waveguides and in free space. Selection of reference material samples is the main part of this work. © 2019 Published under licence by IOP Publishing Ltd
The relationship of time perspective and subjective perceptions of students as the empirical base for individualization of the educational path
The significance of the investigated problem is stipulated by the need in practicing individualization of vocational educational process in the continuing education and lack of scientific and methodological support of its accompaniment. The purpose of the article is to substantiate the subjective perceptions and temporal perspective as the empirical bases of individualization of vocational and educational process. The leading method of research of this problem is a questionnaire that allows to identify the level of demonstration time perspectives (adapted technique ZTPI) and differentiate subjective judgments about the system of vocational education, professional self-determination process (questionnaire). The results of empirical study of time perspective, the subjective perception of vocational education and retrospective-prospective (forward-looking) aspects of professional self-determination, as well as their relationship with students are presented and discussed in the article. The results can be taken into account in the scientific and methodological support of individualization of vocational and educational process and in applied methods of formation of individual educational paths in vocational education. © 2016 Zavodchikov et al
Hadronic Regge Trajectories: Problems and Approaches
We scrutinized hadronic Regge trajectories in a framework of two different
models --- string and potential. Our results are compared with broad spectrum
of existing theoretical quark models and all experimental data from PDG98. It
was recognized that Regge trajectories for mesons and baryons are not straight
and parallel lines in general in the current resonance region both
experimentally and theoretically, but very often have appreciable curvature,
which is flavor-dependent. For a set of baryon Regge trajectories this fact is
well described in the considered potential model. The standard string models
predict linear trajectories at high angular momenta J with some form of
nonlinearity at low J.Comment: 15 pages, 9 figures, LaTe
Three-body correlations in direct reactions: Example of Be populated in reaction
The Be continuum states were populated in the charge-exchange reaction
H(Li,Be) collecting very high statistics data ( events) on the three-body ++ correlations. The
Be excitation energy region below MeV is considered, where the
data are dominated by contributions from the and states. It is
demonstrated how the high-statistics few-body correlation data can be used to
extract detailed information on the reaction mechanism. Such a derivation is
based on the fact that highly spin-aligned states are typically populated in
the direct reactions.Comment: submitted to Physical Review
Minigap, Parity Effect and Persistent Currents in SNS Nanorings
We have evaluated a proximity-induced minigap in the density of states (DOS)
of SNS junctions and SNS nanorings at an arbitrary concentration of
non-magnetic impurities. We have demonstrated that an isotropic energy minigap
in the electron spectrum opens up already at arbitrarily weak disorder, while
angle resolved DOS at higher energies can remain strongly anisotropic. The
minigap value can be tuned by passing a supercurrent through an
SNS junction or by applying a magnetic flux to an SNS ring. A
non-monotonous dependence of on has been found at weak
disorder. We have also studied persistent currents in isolated SNS nanorings.
For odd number of electrons in the ring we have found a non-trivial
current-phase (current-flux) relation which -- at relatively high disorder --
may lead to a -junction state and spontaneous currents in the ground state
of the system.Comment: 7 pages, 8 figure
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