12 research outputs found
Stroboscopic Laser Diagnostics for Detection of Ordering in One-Dimensional Ion beam
A novel diagnostic method for detecting ordering in one-dimensional ion beams
is presented. The ions are excited by a pulsed laser at two different positions
along the beam and fluorescence is observed by a group of four
photomultipliers. Correlation in fluorescence signals is firm indication that
the ion beam has an ordered structure.Comment: 7 pages, REVTEX, fig3 uuencoded, figs 1-2 available upon request from
[email protected], to appear in Phys. Rev.
Coexistence of Single and Double-Quantum Vortex Lines
We discuss the configurations in which singly and doubly quantized vortex
lines may coexist in a rotating superfluid. General principles of energy
minimization lead to the conclusion that in equilibrium the two vortex species
segregate within a cylindrical vortex cluster in two coaxial domains where the
singly quantized lines are in the outer annular region. This is confirmed with
simulation calculations on discrete vortex lines. Experimentally the
coexistence can be studied in rotating superfluid He-A. With cw NMR
techniques we find the radial distribution of the two vortex species to depend
on how the cluster is prepared: (i) By cooling through in rotation,
coexistence in the minimum energy configuration is confirmed. (ii) A glassy
agglomerate is formed if one starts with an equilibrium cluster of
single-quantum vortex lines and adds to it sequentially double-quantum lines,
by increasing the rotation velocity in the superfluid state. This proves that
the energy barriers, which separate different cluster configurations, are too
high for metastabilities to anneal.Comment: 12 pages, 11 figures; Changed content, 15 pages, 14 figure
Project of a fast neutron target based on a 10 MeV 300 kW proton accelerator
Project of targets for high intense neutron source is proposed. The source is based on a proton continuous accelerator with the 10 MeV particle energy and up to 300 kW mean beam power. Problems of fabrication of these targets are discussed. Hot solid state and liquid target designs are considered. Maximum admissible target parameters are presented. Advantages and disadvantages of various types of target for neutron production are discussed
The theory of Schottky spectra of ordered ion beams in a storage ring
SIGLEAvailable from TIB Hannover: RA 3692(91-069) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Expert assessment of animal infectious pathology nosological profile boundaries in a specific agroclimatical zone
Functioning of 51 parasitic systems has been retrospectively ascertained in the South-Eastern agroclimatic zone of Nizhny Novgorod Oblast, their co-agents, apart from their excitants, being productive and non-productive domestic and wild animals. For the entire depth of retrospection (82 years) eleven nosounits of infectious pathology in the region (21.6%) dominated in the quantity of epizootic foci and diseased animals (rabies, dictyocaulosis, infectious atrophic rhinitis, classical pig plague, pyroplasmosis, salmonellosis, swine erysipelas, anthrax, fasciolasis, blackleg, aphtha). They accounted for 241 episootic foci in the nosological profile of infectious pathology (68.5% of the total quantity of animal infectious disease epizootic foci in the region throughout the retrospection). At the same time, 13 nosounits in the investigated territory were registered only once during the entire period of retrospection, no expansion of the boundaries of their epizootic manifestation was ascertained, and carryover of the excitant of these infectious diseases beyond the limits of the original epizootic focus was prevented. Relapses of their epizootic occurrences in the region were prevented as well. Ten nosounits of animal infectious pathology (18%) in the aggregate animal pathology in the examined region during the entire period of retrospection were registered twice (hen typhus, swine and cattle taeniasis, swine metastrongylosis, contagious cattle rhinotracheitis, hen ascaridiasis, cattle parainfluenza, bee nosematosis). In addition, potential danger of animal infectious pathology spontaneous emergence and expansion was revealed in the South-Eastern zone of Nizhny Novgorod Oblast (anthrax, blackleg, cattle tuberculosis, fasciolasis, classical and African pig plague, pyroplasmosis, echinococcosis, rabies). Schematic models of the biological hazard epizootic component potential threat in the region have been designed. New scientific data have been obtained about the epizootic condition dynamics of rural and urban territories in the region as a biological hazard epizootological component, about regional peculiarities of animal infectious pathology specific nosounits, about their potential epidemic danger in the region