50 research outputs found
A search for gamma-ray point sources with the Carpet shower array
A search for super-high energy gamma-ray point sources has been carried out. The well known source Cyg X-3 was observed first and preliminary results of data analysis are presented. There is not positive excess of showers from the source region, but phase analysis discovers a small pulse at phase 0.6 which corresponds to the integral flux (6 + or - 3) X 10 to the minus 14th power cm-2 sec-1 at E sub gamma 3x10 to the 14th power eV
Invariant Sets and Explicit Solutions to a Third-Order Model for the Shearless Stratified Turbulent Flow
We study dynamics of the shearless stratified turbulent flows. Using the
method of differential constraints we find a class of explicit solutions to the
problem under consideration and establish that the differential constraint
obtained coincides with the well-known Zeman--Lumley model for stratified
flows.Comment: arxiv version is already officia
New global stability estimates for monochromatic inverse acoustic scattering
We give new global stability estimates for monochromatic inverse acoustic
scattering. These estimates essentially improve estimates of [P. Hahner, T.
Hohage, SIAM J. Math. Anal., 33(3), 2001, 670-685] and can be considered as a
solution of an open problem formulated in the aforementioned work
Large-Scale Sidereal Anisotropy of Galactic Cosmic-Ray Intensity Observed by the Tibet Air Shower Array
We present the large-scale sidereal anisotropy ofgalactic cosmic-ray
intensity in the multi-TeV region observed with the Tibet-IIIair shower array
during the period from 1999 through 2003. The sidereal daily variation of
cosmic rays observed in this experiment shows an excess of relative intensity
around hours local sidereal time, as well as a deficit around 12
hours local sidereal time. While the amplitude of the excess is not significant
when averaged over all declinations, the excess in individual declinaton bands
becomes larger and clearer as the viewing direction moves toward the south. The
maximum phase of the excess intensity changes from 7 at the northern
hemisphere to 4 hours at the equatorial region. We also show that both
the amplitude and the phase of the first harmonic vector of the daily variation
are remarkably independent of primary energy in the multi-TeV region. This is
the first result determining the energy and declination dependences of the full
24-hour profiles of the sidereal daily variation in the multi-TeV region with a
single air shower experiment.Comment: 13 pages, 3 figures, 1 table. Accepted for publication in ApJ
Observation by an Air-Shower Array in Tibet of the Multi-TeV Cosmic-Ray Anisotropy due to Terrestrial Orbital Motion Around the Sun
We report on the solar diurnal variation of the galactic cosmic-ray intensity
observed by the Tibet III air shower array during the period from 1999 to 2003.
In the higher-energy event samples (12 TeV and 6.2 TeV), the variations are
fairly consistent with the Compton-Getting anisotropy due to the terrestrial
orbital motion around the sun, while the variation in the lower-energy event
sample (4.0 TeV) is inconsistent with this anisotropy. This suggests an
additional anisotropy superposed at the multi-TeV energies, e.g. the solar
modulation effect. This is the highest-precision measurement of the
Compton-Getting anisotropy ever made.Comment: 4 pages, 2 figures, includes .bbl fil
High Altitude Plume Simulations for a Solid Propellant Rocket
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76644/1/AIAA-2007-1013-267.pd
The Search for the Sidereal and Solar Diurnal Modulations in the Total MACRO Muon Data Set
We have analyzed 44.3M single muons collected by MACRO from 1991 through 2000
in 2,145 live days of operation. We have searched for the solar diurnal,
apparent sidereal, and pseudo-sidereal modulation of the underground muon rate
by computing hourly deviations of the muon rate from 6 month averages. We find
evidence for statistically significant modulations with the solar diurnal and
the sidereal periods. The amplitudes of these modulations are <0.1%, and are at
the limit of the detector statistics. The pseudo-sidereal modulation is not
statistically significant.
The solar diurnal modulation is due to the daily atmospheric temperature
variations at 20 km, the altitude of primary cosmic ray interactions with the
atmosphere; MACRO is the deepest experiment to report this result. The sidereal
modulation is in addition to the expected Compton-Getting modulation due to
solar system motion relative to the Local Standard of Rest; it represents
motion of the solar system with respect to the galactic cosmic rays toward the
Perseus spiral arm.Comment: 18 pages, 8 of which are figures, 1 is a table. Accepted by Phys.
Rev.
Waste treatment in metropolis - economic-ecological world experience
The article is devoted to the world problems of environmental pollution (municipal wastes). The authors analyze the ways of their management in various countries, compare the methods of their recycling and describe ecological-economic approach to this problem. The authors found out factors providing advanced recycling technologies development and minimizing environmental pollution