322 research outputs found
Multiphoton communication in lossy channels with photon-number entangled states
No full textWe address binary and quaternary communication channels based on correlated multiphoton two-mode states of radiation in the presence of losses. The protocol are based on photon number correlations and realized upon choosing a shared set of thresholds to convert the outcome of a joint photon number measurement into a symbol from a discrete alphabet. In particular, we focus on channels built using feasible photon-number entangled states (PNES) as two-mode coherently-correlated (TMC) or twin-beam (TWB) states and compare their performances with that of channels built using feasible classically correlated (separable) states. We found that PNES provide larger channel capacity in the presence of loss, and that TWB-based channels may transmit a larger amount of information than TMC-based ones at fixed energy and overall loss. Optimized bit discrimination thresholds, as well as the corresponding maximized mutual information, are explicitly evaluated as a function of the beam intensity and the loss parameter. The propagation of TMC and TWB in lossy channels is analyzed and the joint photon number distribution is evaluated, showing that the beam statistics, either sub-Poissonian for TMC or super-Poissonian for TWB, is not altered by losses. Although entanglement is not strictly needed to establish the channels, which are based on photon-number correlations owned also by separable mixed states, purity of the support state is relevant to increase security. The joint requirement of correlation and purity individuates PNES as a suitable choice to build effective channels. The effects of losses on channel security are briefly discussed
Teachers attitudes toward flipped classroom in Ukrainian Universities.
No full textZamaratskaia G., Kravchenko O., Usenko S., Getya A. Teachers attitudes toward flipped classroom in Ukrainian Universities. Integration of Education, Science and Business in Modern Environment: Summer Debates: Proceedings of the 5th International Scientific and Practical Internet Conference, August 3-4, 2023. Dnipro, 2023. P. 67-69.Flipped learning is an approach that can be used by teachers to provide students with direct access to video lectures and other learning material to be viewed outside of class prior to active learning during class time
Teachers attitudes toward flipped classroom in Ukrainian Universities.
No full textZamaratskaia G., Kravchenko O., Usenko S., Getya A. Teachers attitudes toward flipped classroom in Ukrainian Universities. Integration of Education, Science and Business in Modern Environment: Summer Debates: Proceedings of the 5th International Scientific and Practical Internet Conference, August 3-4, 2023. Dnipro, 2023. P. 67-69.Flipped learning is an approach that can be used by teachers to provide students with direct access to video lectures and other learning material to be viewed outside of class prior to active learning during class time
High sensitivity SQUID-detection and feedback-cooling of an ultrasoft microcantilever
No full textWe measure the motion of an ultrasoft cantilever, carrying a ferromagnetic particle, by means of a superconducting quantum interference device (SQUID). In our scheme, the cantilever motion modulates the magnetic flux in the SQUID due to the coupling with the magnetic particle. For the cantilever fundamental mode, cooled to temperatures below 100 mK, we achieve a dimensionless coupling factor as large as 0.07, displacement sensitivity of 200 fm/Hz⎯⎯⎯⎯⎯√
, and subattonewton force sensitivity. We demonstrate the outstanding combination of very low displacement and force noise by feedback-cooling the cantilever mode to an effective mode temperature of 160 μK
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We thank G. Koning, D. van der Zalm, and R. Koehler for technical support. We acknowledge support from the European Microkelvin Collaboration, in particular for the development of the SQUID sensor. Further financial support was provided by an ERC Starting Grant and by FOM
Upper Bounds on Spontaneous Wave-Function Collapse Models Using Millikelvin-Cooled Nanocantilevers
No full textCollapse models predict a tiny violation of energy conservation, as a consequence of the spontaneous collapse of the wave function. This property allows us to set experimental bounds on their parameters. We consider an ultrasoft magnetically tipped nanocantilever cooled to millikelvin temperature. The thermal noise of the cantilever fundamental mode has been accurately estimated in the range 0.03 – 1 K, and any other excess noise is found to be negligible within the experimental uncertainty. From the measured data and the cantilever geometry, we estimate the upper bound on the continuous spontaneous localization collapse rate in a wide range of the correlation length rC. Our upper bound improves significantly previous constraints for r_C > 10^−6 m, and partially excludes the enhanced collapse rate suggested by Adler. We discuss future improvements
Influence of vitamins on the prooxidant-antioxidant homeostasis in boars under the conditions of heat stress.
No full textUsenko Svitlana O., Shostya Anatolii M., Stojanovskyi Volodymyr G., Tenditnyk Volodymyr S., Birta Gabriela O., Kravchenko Oksana I., Kuzmenko Larysa M. Influence of vitamins on the prooxidant-antioxidant homeostasis in boars under the conditions of heat stress. Ukrainian Journal of Veterinary and Agricultural Sciences. 2020, Vol. 3, # 2. P. 30-35
Influence of vitamins on the prooxidant-antioxidant homeostasis in boars under the conditions of heat stress.
No full textUsenko Svitlana O., Shostya Anatolii M., Stojanovskyi Volodymyr G., Tenditnyk Volodymyr S., Birta Gabriela O., Kravchenko Oksana I., Kuzmenko Larysa M. Influence of vitamins on the prooxidant-antioxidant homeostasis in boars under the conditions of heat stress. Ukrainian Journal of Veterinary and Agricultural Sciences. 2020, Vol. 3, # 2. P. 30-35
Rational therapy of acute otitis media in children based on evidence-based medicine
No full text
Acute otitis media (AOM) is one of the most common diseases in children and adults, as well as the most frequent reasons for prescribing antibacterial therapy (routinely unjustified). The review presents data on the incidence of AOM among the child population in the Russian Federation, discusses the most common viral and bacterial disease pathogens. The review also introduces the term "orthotropic" viral pathogens capable of causing the AOM development with a higher probability. The review discusses the role of microbiota in the AOM development, the difficulties of diagnosis and AOM in children. It also considers the issues of AOM treatment in detail. In clinical practice, preference is given to the combination of lidocaine + phenazone due to the broad evidence base and long-term experience. The recommendation to use topical analgesic drugs as the first-line therapy in AOM during the pre-perforation period of the disease allows to implement a watchful waiting regardin g the use of antibacterial drugs, as well as to avoid adverse events of systemic NSAIDs, such as gastrointestinal disorders and nausea. The review focuses on the use of antibiotic therapy in the treatment of AOM. Rational treatment tactics of AOM allows to avoid the development of complications and the inconsistent use of antimicrobials, which will help to prevent bacterial colonization in the nasopharynx and tympanic cavity, as well as the antibiotic resistance development.
Keywords: acute otitis media, inflammatory diseases, otopathogen, lidocaine, phenazone, NSAIDs, antibiotic therapy.
For citation: Usenko D.V. Rational therapy of acute otitis media in children based on evidence-based medicine. Russian Journal of Woman and Child Health. 2022;5(3):237–243 (in Russ.). DOI: 10.32364/2618-8430-2022-5-3-237-243.
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Sensitivity of the spherical gravitational wave detector MiniGRAIL operating at 5 K
No full textWe present the performances and the strain sensitivity of the first spherical gravitational wave detector equipped with a capacitive transducer and readout by a low noise two-stage SQUID amplifier and operated at a temperature of 5 K. We characterized the detector performance in terms of thermal and electrical noise in the system output signal. We measured a peak strain sensitivity of 1.5x10(-20) Hz(-1/2) at 2942.9 Hz. A strain sensitivity of better than 5x10(-20) Hz(-1/2) has been obtained over a bandwidth of 30 Hz. We expect an improvement of more than 1 order of magnitude when the detector will operate at 50 mK. Our results represent the first step towards the development of an ultracryogenic omnidirectional detector sensitive to gravitational radiation in the 3 kHz range
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