2,334 research outputs found
ОФІСНЕ УПРАВЛІННЯ РЕГІОНАЛЬНИМИ ПОРТФЕЛЯМИ ПРОЕКТІВ З УРАХУВАННЯМ СИНЕРГЕТИКИ ПРИРОДНО-ТЕХНОГЕННОЇ НЕБЕЗПЕКИ
On the basis of standard and guidelines project management PMI for managing portfolios of projects and office strategy proposed model office project portfolio management in the system of civil protection. The method of comprehensive evaluation of the regional nature and industrial danger based on a combination of synergy and statistical objectivity.На основі використання стандарту та основних положень з управління проектами PMI по управлінню портфелями проектів та офісної стратегії запропоновано модель офісного управління портфелями проектів у системі цивільного захисту. Запропонований метод комплексної оцінки стану регіональної природно-техногенної небезпеки на основі поєднання синергетичної та статистичної предметності
МОДЕЛІ ПРОЕКТІВ УПРАВЛІННЯ ЛЮДСЬКИМИ ПОТОКАМИ БЕЗПЕЧНОЇ ЕВАКУАЦІЇ ІЗ СПОРТИВНО-ВИДОВИЩНИХ СПОРУД
On the basis of mathematical apparatus theories topological analysis and synthesis of human flow developed topological model and mathematical model describing the behavior of human flows in the project environment, which can detect critical paths, buffer zones and predict panic and viewers security evacuation.На базі теорій топологічного аналізу та синтезу систем управління людськими потоками розроблені топологічні модель-схеми та формалізовану модель поведінки людських потоків у середовищі проекту, які дають змогу виявити критичні шляхи, буферні зони, а також прогнозувати безпорядки та безпеку евакуації глядачів із стадіону «Арена-Львів»
Coexisting Fermi Liquid and Strange Metal Phenomena in SrRuO
The strange metal is an enigmatic phase whose properties are irreconcilable
with the established Fermi liquid theory of conductors. A fundamental question
is whether a strange metal and a Fermi liquid are distinct phases of matter, or
whether a material can be intermediate between or in a superposition of the
two. We studied the collective density response of the correlated metal
SrRuO by momentum-resolved electron energy-loss spectroscopy (M-EELS).
We discovered that a broad continuum of non-propagating charge fluctuations (a
characteristic of strange metals) and also a dispersing Fermi liquid-like
collective mode at low energies and long wavelengths coexist in the same
material at the same temperature. These features exhibit a spectral weight
redistribution and velocity renormalization when we cool the material through
the quasiparticle coherence temperature. Our results show not only that strange
metal and Fermi liquid phenomena can coexist but also that SrRuO serves
as an ideal test case for studying the interaction between the two.Comment: 12 pages, 4 figure
Low-mass e+e- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum
We report a measurement of low-mass electron pairs observed in 158
GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of
invariant masses 0.2 < m < 2.0 GeV is enhanced by a factor of 3.5 +/- 0.4
(stat) +/- 0.9 (syst) over the expectation from neutral meson decays. As
observed previously in S-Au collisions, the enhancement is most pronounced in
the invariant-mass region 300-700 MeV. For Pb-Au we find evidence for a strong
increase of the enhancement with centrality. In addition, we show that the
enhancement covers a wide range in transverse momentum, but is largest at the
lowest observed pt.Comment: 17 pages, 4 figures, submitted to Phys.Lett.
Leptonic and charged kaon decay modes of the meson measured in heavy-ion collisions at the CERN SPS
We report a measurement of meson production in central Pb+Au
collisions at E/A=158 GeV. For the first time in heavy-ion collisions,
mesons were reconstructed in the same experiment both in the KK
and the dilepton decay channel. Near mid-rapidity, this yields rapidity
densities, corrected for production at the same rapidity value, of 2.05 +-
0.14(stat) +- 0.25(syst) and 2.04 +- 0.49(stat)+-{0.32}(syst), respectively.
The shape of the measured transverse momentum spectra is also in close
agreement in both decay channels. The data rule out a possible enhancement of
the yield in the leptonic over the hadronic channel by a factor larger
than 1.6 at 95% CL.Comment: 11 pages, 4 figures,submitted to Phys. Rev. Let
Recent results from Pb-Au collisions at 158 GeV/c per nucleon obtained with the CERES spectrometer
During the 1996 lead run time, CERES has accumulated 42 million events,
corresponding to a factor of 5 more statistics than in 1995 and 2.5 million
events of a special photon-run. We report on the results of the low-mass
ee-pair analysis. Since the most critical item is the poor
signal-to-background ratio we also discuss the understanding of this
background, in absolute terms, with the help of a detailed Monte Carlo
simulation. We show preliminary results of the photon analysis and summarize
the results of the hadron analysis preliminarily reported on already at QM'97Comment: 10 pages, 9 figures, Proceedings of the XIV Int. Conf. on
Nucleus-Nucleus Collisions,Quark Matter 99, Torino, Italy, May 10 - 15, 199
Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy
Differential elliptic flow spectra v2(pT) of \pi-, K0short, p, \Lambda have
been measured at \sqrt(s NN)= 17.3 GeV around midrapidity by the
CERN-CERES/NA45 experiment in mid-central Pb+Au collisions (10% of
\sigma(geo)). The pT range extends from about 0.1 GeV/c (0.55 GeV/c for
\Lambda) to more than 2 GeV/c. Protons below 0.4 GeV/c are directly identified
by dE/dx. At higher pT, proton elliptic flow v2(pT) is derived as a
constituent, besides \pi+ and K+, of the elliptic flow of positive pion
candidates. The retrieval requires additional inputs: (i) of the particle
composition, and (ii) of v2(pT) of positive pions. For (i), particle ratios
obtained by NA49 were adapted to CERES conditions; for (ii), the measured
v2(pT) of negative pions is substituted, assuming \pi+ and \pi- elliptic flow
magnitudes to be sufficiently close. The v2(pT) spectra are compared to
ideal-hydrodynamics calculations. In synopsis of the series \pi- - K0short - p
- \Lambda, flow magnitudes are seen to fall with decreasing pT progressively
even below hydro calculations with early kinetic freeze-out (Tf= 160 MeV)
leaving not much time for hadronic evolution. The proton v2(pT) data show a
downward swing towards low pT with excursions into negative v2 values. The
pion-flow isospin asymmetry observed recently by STAR at RHIC, invalidating in
principle our working assumption, is found in its impact on proton flow
bracketed from above by the direct proton flow data, and not to alter any of
our conclusions. Results are discussed in perspective of recent viscous
dynamics studies which focus on late hadronic stages.Comment: 38 pages, 27 figures, 2 tables. Abstract and parts of introduction
made more comprehensible; corrected typos; acknowledgement added. To appear
in Nucl.Phys.
Azimuthal dependence of pion source radii in Pb+Au collisions at 158 A GeV
We present results of a two-pion correlation analysis performed with the
Au+Pb collision data collected by the upgraded CERES experiment in the fall of
2000. The analysis was done in bins of the reaction centrality and the pion
azimuthal emission angle with respect to the reaction plane. The pion source,
deduced from the data, is slightly elongated in the direction perpendicular to
the reaction plane, similarly as was observed at the AGS and at RHIC.Comment: 5 pages, 2 figure
Lambda production in 40 A GeV/c Pb-Au collisions
During the 1999 lead run, CERES has measured hadron and electron-pair
production at 40 A GeV/c beam momentum with the spectrometer upgraded by the
addition of a radial TPC. Here the analysis of lambda and antilambda will be
presented.Comment: 8 pages, 8 figures. 6th International Conference on Strange Quarks in
Matter, Frankfurt 200
- …