370 research outputs found
Stabilizacja systemu demokratycznego: wybory parlamentarne 1997 w Polsce
"W 1997 r. Polacy mogli dwukrotnie uczestniczyć w powszechnym głosowaniu.
Zanim zakończyła się kadencja sejmu wybranego w 1993 r., który jako pierwszy
w dziejach III Rzeczpospolitej pracował przez cztery lata, odbyło się referendum.
Zadecydowano w nim o losie nowej konstytucji, uchwalonej przez Zgromadzenie
Narodowe 2 kwietnia 1997 r. Referendum to, przeprowadzone na zaledwie cztery
miesiące przed wyborami parlamentarnymi, stało się szczególnym rodzajem prawyborów,
w których scena polityczna podzieliła się na dwa wielkie obozy polityczne:
zwolenników i przeciwników nowej ustawy zasadniczej."(...
Dynamically-coupled partial-waves in isospin-2 scattering from lattice QCD
We present the first determination of scattering, incorporating
dynamically-coupled partial-waves, using lattice QCD, a first-principles
numerical approach to QCD. Considering the case of isospin-2 , we
calculate partial-wave amplitudes with and determine the degree of
dynamical mixing between the coupled and -wave channels with .
The analysis makes use of the relationship between scattering amplitudes and
the discrete spectrum of states in the finite volume lattice. Constraints on
the scattering amplitudes are provided by over one hundred energy levels
computed on two lattice volumes at various overall momenta and in several
irreducible representations of the relevant symmetry groups. The spectra follow
from variational analyses of matrices of correlations functions computed with
large bases of meson-meson operators. Calculations are performed with
degenerate light and strange quarks tuned to the physical strange quark mass so
that MeV, ensuring that the is stable against strong
decay. This work demonstrates the successful application of techniques, opening
the door to calculations of scattering processes that incorporate the effects
of dynamically-coupled partial-waves, including those involving resonances or
bound states.Comment: Minor changes to match the published versio
Wybrane aspekty funkcjonowania Sejmu w latach 1997–2007
Praca recenzowana / peer-reviewed paperPraca naukowa finansowana ze środków na naukę w latach 2006–2008 jako projekt
badawczy własny Nr 1 H02E 052 3
Mechanical thrombectomy in acute stroke – Five years of experience in Poland
Objectives
Mechanical thrombectomy (MT) is not reimbursed by the Polish public health system. We present a description of 5 years of experience with MT in acute stroke in Comprehensive Stroke Centers (CSCs) in Poland.
Methods and results
We retrospectively analyzed the results of a structured questionnaire from 23 out of 25 identified CSCs and 22 data sets that include 61 clinical, radiological and outcome measures.
Results
Most of the CSCs (74%) were founded at University Hospitals and most (65.2%) work round the clock. In 78.3% of them, the working teams are composed of neurologists and neuro-radiologists. All CSCs perform CT and angio-CT before MT. In total 586 patients were subjected to MT and data from 531 of them were analyzed. Mean time laps from stroke onset to groin puncture was 250±99min. 90.3% of the studied patients had MT within 6h from stroke onset; 59.3% of them were treated with IV rt-PA prior to MT; 15.1% had IA rt-PA during MT and 4.7% – emergent stenting of a large vessel. M1 of MCA was occluded in 47.8% of cases. The Solitaire device was used in 53% of cases. Successful recanalization (TICI2b–TICI3) was achieved in 64.6% of cases and 53.4% of patients did not experience hemorrhagic transformation. Clinical improvement on discharge was noticed in 53.7% of cases, futile recanalization – in 30.7%, mRS of 0–2 – in 31.4% and mRS of 6 in 22% of cases.
Conclusion
Our results can help harmonize standards for MT in Poland according to international guidelines
Study of the decay
The decay is studied
in proton-proton collisions at a center-of-mass energy of TeV
using data corresponding to an integrated luminosity of 5
collected by the LHCb experiment. In the system, the
state observed at the BaBar and Belle experiments is
resolved into two narrower states, and ,
whose masses and widths are measured to be where the first uncertainties are statistical and the second
systematic. The results are consistent with a previous LHCb measurement using a
prompt sample. Evidence of a new
state is found with a local significance of , whose mass and width
are measured to be and , respectively. In addition, evidence of a new decay mode
is found with a significance of
. The relative branching fraction of with respect to the
decay is measured to be , where the first
uncertainty is statistical, the second systematic and the third originates from
the branching fractions of charm hadron decays.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-028.html (LHCb
public pages
Measurement of the ratios of branching fractions and
The ratios of branching fractions
and are measured, assuming isospin symmetry, using a
sample of proton-proton collision data corresponding to 3.0 fb of
integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The
tau lepton is identified in the decay mode
. The measured values are
and
, where the first uncertainty is
statistical and the second is systematic. The correlation between these
measurements is . Results are consistent with the current average
of these quantities and are at a combined 1.9 standard deviations from the
predictions based on lepton flavor universality in the Standard Model.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-039.html (LHCb
public pages
Crisis of the Communist System in Poland of the Eighties
The article depicts six main reasons, for which the crisis of the communist system in Poland in the eighties escalated. The most important factor were changes in the USSR after Mikhail Gorbachov’s accession to power and proclamation of “perestroyka”, the consequence of which was withdrawal from the Brezhnev doctrine. Among the internal factors the most important were: condition of the economy, which after the introduction of martial law was in the constant crisis; the phenomena of privatisation of the communist state, which in the last period of the PZPR rule led to the process of bestowing property on some people from the governing apparatus of the communist Poland; deregulation of the political system, the most important manifestation of which was impairment of the PZPR position, which had a hegemonic role in the political system of the communist Poland; evolution of mood of the public, which after 1985 became much lower; activities of hierarchy of the Catholic Church and political opposition, the main part of which belonged to the moderate stream seeking agreement with Wojciech
Jaruzelski’s team
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