1,154 research outputs found
Economic necessity for developing the milk sector
The Merinos dominating in the Hungarian sheep industry and the profitability of sheep production
is not as high as would be necessary. Economic analysis was made to find out the possible break-even points.
According to the results, the increase of milk production might be the key to solve this problem, but some
conditions should be considered. Regarding the data presented the possible conclusions might be summarized
as follows: Enlarging the stock without improving the phenotypic background is not profitable. This method will
lead to a deadlock. The utilization of milk breeds under the present conditions could be realized: (i) if the costs of
changing the breeding animals could be covered from other sources, since national sources are not available;
(ii) if the attitude of the managers and employees of milk sheep farms could change; and (iii) if the price of milk
was reasonable and the state purchase prices could reach the average prices of the EU (1 Euro/litre)
Underlying Event Studies for LHC Energies
Underlying event was originally defined by the CDF collaboration decades ago.
Here we improve the original definition to extend our analysis for events with
multiple-jets. We introduce a definition for surrounding rings/belts and based
on this definition the jet- and surrounding-belt-excluded areas will provide a
good underlying event definition. We inverstigate our definition via the
multiplicity in the defined geometry. In parallel, mean transverse momenta of
these areas also studied in proton-proton collisions at TeV LHC
energy.Comment: 6 pages and 4 figure
Shape of an elastica under growth restricted by friction
We investigate the quasi-static growth of elastic fibers in the presence of
dry or viscous friction. An unusual form of destabilization beyond a critical
length is described. In order to characterize this phenomenon, a new definition
of stability against infinitesimal perturbations over finite time intervals is
proposed and a semi-analytical method for the determination of the critical
length is developed. The post-critical behavior of the system is studied by
using an appropriate numerical scheme based on variational methods. We find
post-critical shapes for uniformly distributed as well as for concentrated
growth and demonstrate convergence to a figure-8 shape for large lengths when
self-crossing is allowed. Comparison with simple physical experiments yields
reasonable accuracy of the theoretical predictions
On Conserved Current in Markovian Open Quantum Systems
We reexamine the markovian approximation of local current in open quantum
systems, discussed recently by Gebauer and Car. Our derivation is more
transparent, the proof of current conservation becomes explicit and easy.Comment: 3 page
The pseudogap phase in (TaSe_4)_2I
We have developed the mean-field theory of coexisting charge-density waves
(CDW) and unconventional charge-density waves (UCDW). The double phase
transition manifests itself in the thermodynamic quantities and in the magnetic
response, such as spin susceptibility and spin-lattice relaxation rate. Our
theory applies to quasi-one dimensional (TaSe_4)_2I, where above the CDW
transition, thermal fluctuations die out rapidly, but robust pseudogap
behaviour is still detected. We argue, that the fluctuations are suppressed due
to UCDW, which partially gaps the Fermi surface, and causes non-Fermi-liquid
(pseudogap) behaviour.Comment: 7 pages, 6 figure
Subacute exposure of rats by metal oxide nanoparticles through the airways: general toxicity and neuro-functional effects
In order to create an animal model of human inhalational exposure by industrial trAct
metal fumes, nanoparticulate metal oxides (MnO2
, CdO2
, PbO) were synthesized and instilled
into the trachea of rats 5 times a week for 6 weeks (metal doses per kg b.w.: 2.63 and 5.26 mg
Mn; 0.04 and 0.4 mg Cd; 2 and 4 mg Pb). At the end, the rats’ body weight gain during the treatment was determined, the animals had an open field session to investigate their spontaneous
motility, and finally spontaneous and stimulus-evoked cortical activity was recorded in urethane
anaesthesia. Mn caused decrease of open field ambulation and rearing, Cd had no effect,
whereas Pb caused decreased rearing and increased ambulation. Spontaneous cortical activity
was shifted to higher frequencies with each metal. Cortical evoked potentials had lengthened
latency, mainly with Mn and Cd; and increased frequency dependence with Cd and Pb but hardly
with Mn. The effects proved indirectly that the metal content of the nanoparticles had access
form the airways to the CNS. Our method seems suitable for modelling human nervous system
damage due to inhaled nanoparticles
A Linear Iterative Unfolding Method
A frequently faced task in experimental physics is to measure the probability
distribution of some quantity. Often this quantity to be measured is smeared by
a non-ideal detector response or by some physical process. The procedure of
removing this smearing effect from the measured distribution is called
unfolding, and is a delicate problem in signal processing, due to the
well-known numerical ill behavior of this task. Various methods were invented
which, given some assumptions on the initial probability distribution, try to
regularize the unfolding problem. Most of these methods definitely introduce
bias into the estimate of the initial probability distribution. We propose a
linear iterative method, which has the advantage that no assumptions on the
initial probability distribution is needed, and the only regularization
parameter is the stopping order of the iteration, which can be used to choose
the best compromise between the introduced bias and the propagated statistical
and systematic errors. The method is consistent: "binwise" convergence to the
initial probability distribution is proved in absence of measurement errors
under a quite general condition on the response function. This condition holds
for practical applications such as convolutions, calorimeter response
functions, momentum reconstruction response functions based on tracking in
magnetic field etc. In presence of measurement errors, explicit formulae for
the propagation of the three important error terms is provided: bias error,
statistical error, and systematic error. A trade-off between these three error
terms can be used to define an optimal iteration stopping criterion, and the
errors can be estimated there. We provide a numerical C library for the
implementation of the method, which incorporates automatic statistical error
propagation as well.Comment: Proceedings of ACAT-2011 conference (Uxbridge, United Kingdom), 9
pages, 5 figures, changes of corrigendum include
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