230 research outputs found
Wielowymiarowe porównania systemów zdrowotnych w krajach OECD w kontekście realizowanych modeli ochrony zdrowia
Niniejszy tekst dotyczy zagadnień przekształceń systemów zdrowotnych w krajach rozwiniętych. Autor stawia pytanie czy wobec różnicowania się systemów zdrowotnych poprzez wzajemne zapożyczanie rozwiązań istnieje sens analizy systemów zdrowotnych poprzez odnoszenie się modeli ochrony zdrowia. Na podstawie przeprowadzonych analiz wykazał, że stosowane rozwiązania modelowe wywierają istotny statystycznie wpływ na kształtowanie się charakterystyk ochrony zdrowia. Jednocześnie eksponowanie podejścia modelowego wraz z koncentracją wyłącznie na kwestiach ekonomicznych powinno zostać uznane za zbyt wąskie i nie oddające istoty zróżnicowania systemów zdrowotnych. Niezbędne jest całościowe podejście, uwzględniające różne elementy systemu ochrony zdrowia w szczególności: mechanizmów alokacji oraz rozwiązań organizacyjnych i instytucjonalnych.Paweł Białynicki-Birul
Motivic DT-invariants for the one loop quiver with potential
In this paper we compute the motivic Donaldson--Thomas invariants for the
quiver with one loop and any potential. As the presence of arbitrary potentials
requires the full machinery of \hat(\mu)-equivariant motives, we give a
detailed account of them. In particular, we will prove two results for the
motivic vanishing cycle which might be of importance not only in
Donaldson--Thomas theory.Comment: 30 page
Roots of the affine Cremona group
Let k[x_1,...,x_n] be the polynomial algebra in n variables and let A^n=Spec
k[x_1,...,x_n]. In this note we show that the root vectors of the affine
Cremona group Aut(A^n) with respect to the diagonal torus are exactly the
locally nilpotent derivations x^a\times d/dx_i, where x^a is any monomial not
depending on x_i. This answers a question due to Popov.Comment: 4 page
Phase space localization of antisymmetric functions
Upper and lower bounds are written down for the minimum information entropy
in phase space of an antisymmetric wave function in any number of dimensions.
Similar bounds are given when the wave function is restricted to belong to any
of the proper subspaces of the Fourier transform operator.Comment: 5 pages, REVTEX, no figure
Quantum effects in the evolution of vortices in the electromagnetic field
We analyze the influence of electron-positron pairs creation on the motion of
vortex lines in electromagnetic field. In our approach the electric and
magnetic fields satisfy nonlinear equations derived from the Euler-Heisenberg
effective Lagrangian. We show that these nonlinearities may change the
evolution of vortices.Comment: REVTEX4 and 5 EPS figure
On motivic decompositions arising from the method of Bialynicki-Birula
Recently, V. Chernousov, S. Gille and A. Merkurjev have obtained a
decomposition of the motive of an isotropic smooth projective homogeneous
variety analogous to the Bruhat decomposition. Using the method of
Bialynicki-Birula, I generalize this decomposition to the case of a (possibly
anisotropic) smooth projective variety homogeneous under the action of an
isotropic reductive group. This answers a question of N. Karpenko.Comment: Vastly improved with (1) references to important previous work on the
subject by S. del Bano, (2) an explicit combinatorial description of the
decomposition of projective homogeneous varieties in terms of reflection
groups and (3) an illustrative exampl
Point Charge in the Born-Infeld Electrodynamics
We show that the nonlinear Born-Infeld field equations supplemented by the
"dynamical condition" (certain boundary condition for the field along the
particle's trajectory) define perfectly deterministic theory, i.e. particle's
trajectory is determined without any equations of motion. It is a first step
towards constructing the consistent theory of point particles interacting with
nonlinear electromagnetism.Comment: 11 pages, LATE
Nambu-Type Generalization of the Dirac Equation
Nonlinear generalization of the Dirac equation extending the standard
paradigm of nonlinear Hamiltonians is discussed. ``Faster-than-light
telegraphs" are absent for all theories formulated within the new framework. A
new metric for infinite dimensional Lie algebras associated with Lie-Poisson
dynamics is introduced.Comment: revtex, 19 page
Structure of nonlinear gauge transformations
Nonlinear Doebner-Goldin [Phys. Rev. A 54, 3764 (1996)] gauge transformations
(NGT) defined in terms of a wave function do not form a group. To get
a group property one has to consider transformations that act differently on
different branches of the complex argument function and the knowledge of the
value of is not sufficient for a well defined NGT. NGT that are well
defined in terms of form a semigroup parametrized by a real number
and a nonzero which is either an integer or . An extension of NGT to projectors and general density matrices
leads to NGT with complex . Both linearity of evolution and Hermiticity
of density matrices are gauge dependent properties.Comment: Final version, to be published in Phys.Rev.A (Rapid Communication),
April 199
Generation and control of resonance states in crossed magnetic and electric fields
A two-dimensional electron system interacting with an impurity and placed in
crossed magnetic and electric fields is under investigation. Since it is
assumed that an impurity center interacts as an attractive -like
potential a renormalization procedure for the retarded Green's function has to
be carried out. For the vanishing electric field we obtain a close analytical
expression for the Green's function and we find one bound state localized
between Landau levels. It is also shown by numerical investigations that
switching on the electric field new long-living resonance states localized in
the vicinity of Landau levels can be generated.Comment: 6 pages, 6 figures, 1 tabl
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