245 research outputs found
WYNIKI PRODUKCYJNE KRÓLIKÓW ŻYWIONYCH PODCZAS TUCZU MIESZANKĄ BEZ DODATKU KOKCYDIOSTAKTYKU
The objective of this study was to determine whether meat-type rabbits can be fed a diet without coccidiostatics during the fattening period. The effect of feeding two pelleted diets was compared during the experiment. The control diet was supplemented with the coccidiostatic drug robenidine, while the experimental diet contained no coccidiostatics. Over the experimental period the animals were weighed at 35, 56, 70, 77 and 90 days of age. Feces samples were taken for parasitological analysis and assayed for the presence of coccidia. Mortality rates were determined at particular stages of the experiment. It was found that a diet without the coccidiostatic drug had no statistically significant effect on the final body weights of rabbits. It was also demonstrated that coccidian infection rates and mortality rates were slightly higher in the experimental group.Badania miały na celu wykazanie możliwości żywienia królików mięsnych podczas tuczu mieszanką pełnoporcjową nie zawierającą kokcydiostatyku. W trakcie eksperymentu porównano wpływ żywienia mieszankami pełnoporcjowymi granulowanymi, z których kontrolna zawierała kokcydiostatyk – robenidynę a doświadczalna była go pozbawiona. Podczas badań zwierzęta ważono w 35, 56, 70, 77 i 90 dniu życia, ponadto z pod każdej klatki pobierano próbki kału do badań parazytologicznych na obecność kokcydii. Dodatkowo obliczono procent upadków królików podcza poszczególnych etapów trwania eksperymentu. Przeprowadzone badania pozwoliły na stwierdzenie, że brak kokcydiostatyku w mieszance nie wpłynął statystycznie na końcową masę ciała królików. Wykazano, że poziom
zarażenia kokcydiami i procent upadków był nieco wyższy w grupie doświadczalnej, jednak nie został potwierdzony statystycznie
Critical Phenomenon of a Consistent q-Deformed Squeezed State
Within a self-consistent framework of q-deformed Heisenberg algebra and its
equivalent framework of q-deformed boson commutation relations, which relate to
the under-cutting phenomenon of Heisenberg's minimal uncertainty relation,
special q-deformed squeezed states are constructed. Besides the similar local
maximum squeezing as the one in the undeformed case, new strong squeezing
appears when the amplitude of the related coherent state increases to large
values. A critical phenomenon appears at a large value of the amplitude: the
variance of one component of the quadrature of the light field approaches zero,
but the variance of the corresponding conjugate quantity remains finite, which
is a surprising deviation from Heisenberg's uncertainty relation. The
qualitative character exposed by this q-squeezed state may provide some
evidence about q-deformed effects in current experiments.Comment: 12 pages, LaTeX, including 2 figure
Classical and quantum q-deformed physical systems
On the basis of the non-commutative q-calculus, we investigate a
q-deformation of the classical Poisson bracket in order to formulate a
generalized q-deformed dynamics in the classical regime. The obtained
q-deformed Poisson bracket appears invariant under the action of the
q-symplectic group of transformations. In this framework we introduce the
q-deformed Hamilton's equations and we derive the evolution equation for some
simple q-deformed mechanical systems governed by a scalar potential dependent
only on the coordinate variable. It appears that the q-deformed Hamiltonian,
which is the generator of the equation of motion, is generally not conserved in
time but, in correspondence, a new constant of motion is generated. Finally, by
following the standard canonical quantization rule, we compare the well known
q-deformed Heisenberg algebra with the algebra generated by the q-deformed
Poisson bracket.Comment: 9 pages, accepted for publication in "The European Physical Journal
C
Local realizations of -Oscillators in Quantum Mechanics
Representations of the quantum q-oscillator algebra are studied with
particular attention to local Hamiltonian representations of the Schroedinger
type. In contrast to the standard harmonic oscillators such systems exhibit a
continuous spectrum. The general scheme of realization of the q-oscillator
algebra on the space of wave functions for a one-dimensional Schroedinger
Hamiltonian shows the existence of non-Fock irreducible representations
associated to the continuous part of the spectrum and directly related to the
deformation. An algorithm for the mapping of energy levels is described.Comment: 12 pages, LaTeX, Phys. Lett. A, to be publishe
Nutrient digestibility in Arctic fox (Vulpes lagopus) fed diets containing animal meals
Social Interactions vs Revisions, What is important for Promotion in Wikipedia?
In epistemic community, people are said to be selected on their knowledge
contribution to the project (articles, codes, etc.) However, the socialization
process is an important factor for inclusion, sustainability as a contributor,
and promotion. Finally, what does matter to be promoted? being a good
contributor? being a good animator? knowing the boss? We explore this question
looking at the process of election for administrator in the English Wikipedia
community. We modeled the candidates according to their revisions and/or social
attributes. These attributes are used to construct a predictive model of
promotion success, based on the candidates's past behavior, computed thanks to
a random forest algorithm.
Our model combining knowledge contribution variables and social networking
variables successfully explain 78% of the results which is better than the
former models. It also helps to refine the criterion for election. If the
number of knowledge contributions is the most important element, social
interactions come close second to explain the election. But being connected
with the future peers (the admins) can make the difference between success and
failure, making this epistemic community a very social community too
One dimensional potentials in q space
We study the one dimensional potentials in q space and the new features that
arise. In particular we show that the probability of tunneling of a particle
through a barrier or potential step is less than the one of the same particle
with the same energy in ordinary space which is somehow unexpected. We also
show that the tunneling time for a particle in q space is less than the one of
the same particle in ordinary space.Comment: 10 pages, LaTeX2e, no figur
Anyonic behavior of quantum group gases
We first introduce and discuss the formalism of -bosons and fermions
and consider the simplest Hamiltonian involving these operators. We then
calculate the grand partition function for these models and study the high
temperature (low density) case of the corresponding gases for . We show
that quantum group gases exhibit anyonic behavior in and spatial
dimensions. In particular, for a boson gas at the parameter
interpolates within a wider range of attractive and repulsive systems than the
anyon statistical parameter.Comment: LaTeX file, 19 pages, two figures ,uses epsf.st
On Non-Commutative Orbifolds of K3 Surfaces
Using the algebraic geometry method of Berenstein and Leigh for the
construction of the toroidal orbifold (T^2 x T^2 x T^2) / (Z_2 x Z_2) with
discrete torsion and considering local K3 surfaces, we present non-commutative
aspects of the orbifolds of product of K3 surfaces. In this way, the ordinary
complex deformation of K3 can be identified with the resolution of stringy
singularities by non-commutative algebras using crossed products. We give
representations and make some comments regarding the fractionation of branes.
Illustrating examples are presented.Comment: 23 page
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