14 research outputs found
Example of q-deformed Field Theory
The non-relativistic Chern-Simons theory with the single-valued anyonic field
is proposed as an example of q-deformed field theory. The corresponding
q-deformed algebra interpolating between bosons and fermions,both in position
and momentum spaces, is analyzed.A possible generalization to a space with an
arbitrary dimension is suggested.Comment: 13 pages,LaTe
Quons as su(2) Irreducible Tensor Operators
We prove that, for the quon algebra, which interpolates between the Bose and
Fermi statistics and depends on a free parameter q,it is possible to build an
su(2) irreducible representation. One of the consequences of this fact is that
the quons couple via the same angular momentum coupling rules obeyed by
ordinary bosons and fermions.Comment: 8 pages,Late
Unified View of Deformed Single - Mode Oscillator Algebras
A general framework for the deformation of the single-mode oscillators is
presented and all deformed single-mode oscillators are unified. The extensions
of the Aric-Coon, genon, the para-Bose and the para-Fermi oscillators are
proposed. The generalized harmonic oscillator considered by Brzezinski et al.
is rederived in a simple way.Some remarks on deformation of and
supersymmetry are made.Comment: 12 pages, Latex file, preprint RBI-TH-3/94,PMF-ZTF-3/94, February
1994. (to appear in Phys.Lett. B
pyPESTO: A modular and scalable tool for parameter estimation for dynamic models
Mechanistic models are important tools to describe and understand biological
processes. However, they typically rely on unknown parameters, the estimation
of which can be challenging for large and complex systems. We present pyPESTO,
a modular framework for systematic parameter estimation, with scalable
algorithms for optimization and uncertainty quantification. While tailored to
ordinary differential equation problems, pyPESTO is broadly applicable to
black-box parameter estimation problems. Besides own implementations, it
provides a unified interface to various popular simulation and inference
methods. pyPESTO is implemented in Python, open-source under a 3-Clause BSD
license. Code and documentation are available on GitHub
(https://github.com/icb-dcm/pypesto)
Exclusion statistics,operator algebras and Fock space representations
We study exclusion statistics within the second quantized approach. We
consider operator algebras with positive definite Fock space and restrict them
in a such a way that certain state vectors in Fock space are forbidden ab
initio.We describe three characteristic examples of such exclusion, namely
exclusion on the base space which is characterized by states with specific
constraint on quantum numbers belonging to base space M (e.g.
Calogero-Sutherland type of exclusion statistics), exclusion in the
single-oscillator Fock space, where some states in single oscillator Fock space
are forbidden (e.g. the Gentile realization of exclusion statistics) and a
combination of these two exclusions (e.g. Green's realization of para-Fermi
statistics). For these types of exclusions we discuss extended Haldane
statistics parameters g, recently introduced by two of us in Mod.Phys.Lett.A
11, 3081 (1996), and associated counting rules. Within these three types of
exclusions in Fock space the original Haldane exclusion statistics cannot be
realized.Comment: Latex,31 pages,no figures,to appear in J.Phys.A : Math.Ge
Inventory of current EU paediatric vision and hearing screening programmes
Background: We examined the diversity in paediatric vision and hearing screening
programmes in Europe.
Methods: Themes relevant for comparison of screening programmes were derived from
literature and used to compile three questionnaires on vision, hearing and public-health
screening. Tests used, professions involved, age and frequency of testing seem to influence
sensitivity, specificity and costs most. Questionnaires were sent to ophthalmologists,
orthoptists, otolaryngologists and audiologists involved in paediatric screening in all EU fullmember,
candidate and associate states. Answers were cross-checked.
Results: Thirty-nine countries participated; 35 have a vision screening programme, 33 a
nation-wide neonatal hearing screening programme. Visual acuity (VA) is measured in 35
countries, in 71% more than once. First measurement of VA varies from three to seven years
of age, but is usually before the age of five. At age three and four picture charts, including Lea
Hyvarinen are used most, in children over four Tumbling-E and Snellen. As first hearing
screening test otoacoustic emission (OAE) is used most in healthy neonates, and auditory
brainstem response (ABR) in premature newborns. The majority of hearing testing
programmes are staged; children are referred after one to four abnormal tests. Vision
screening is performed mostly by paediatricians, ophthalmologists or nurses. Funding is
mostly by health insurance or state. Coverage was reported as >95% in half of countries, but
reporting was often not first-hand.
Conclusion: Largest differences were found in VA charts used (12), professions involved in
vision screening (10), number of hearing screening tests before referral (1-4) and funding
sources (8)