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Search Results: 1 - 10 of 936 matches for " Stanislav Korenko "
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A Parasitoid Wasp Induces Overwintering Behaviour in Its Spider Host
Stanislav Korenko, Stano Pekár
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0024628
Abstract: Parasites and parasitoids control behaviors of their hosts. However, the origin of the behavior evoked by the parasitic organism has been rarely identified. It is also not known whether the manipulation is universal or host-specific. Polysphinctine wasps, koinobiont ectoparasitoids of several spider species that manipulate host web-spinning activity for their own protection during pupation, provide an ideal system to reveal the origin of the evoked behavior. Larva of Zatypota percontatoria performed species-specific manipulation of theridiid spiders, Neottiura bimaculata and Theridion varians, shortly before pupation. Parasitized N. bimaculata produced a dense web, whereas parasitized T. varians built a cupola-like structure. The larva pupated inside of either the dense web or the cupola-like structure. We discovered that unparasitized N. bimaculata produce an analogous dense web around their eggsacs and for themselves during winter, while T. varians construct an analogous ‘cupola’ only for overwintering. We induced analogous manipulation in unparasitized hosts by altering ambient conditions. We discovered that the behavior evoked by larvae in two hosts was functionally similar. The larva evoked protective behaviors that occur in unparasitized hosts only during specific life-history periods.
Spiders (Araneae) from the Pansky diel (Starohorské vrchy Mts, Slovakia)
Franc, Valerián,Korenko, Stanislav
Arachnologische Mitteilungen , 2008, DOI: 10.5431/aramit3603
Abstract: Spiders were collected at the massif 'Pansky diel' near the city of Banská Bystrica (Central Slovakia). We recorded 252 spider species for the territory and one new species for Slovakia. Although the summit reaches an altitude of 1.100 m a.s.l., more or less thermophilous species apparently prevail here, especially at lower moderate sites. On the other hand, only several typical oreophilous species were documented. Many recorded species are scarce or even very rare. This indicates the very high value of this territory from both a genetic and an environmental perspective.
Stenochrus portoricensis new to the Czech Republic (Schizomida, Hubbardiidae)
Korenko, Stanislav,Harvey, Mark,Pekár, Stano
Arachnologische Mitteilungen , 2009, DOI: 10.5431/aramit3801
Abstract: A schizomid, Stenochrus portoricensis Chamberlin, 1922 (family Hubbardiidae), was collected in a greenhouse in Brno. This is the first discovery of a schizomid from the Czech Republic.
Hymenopteran parasitoids of the ant-eating spider Zodarion styliferum (Simon) (Araneae, Zodariidae)
Stanislav Korenko,Stefan Schmidt,Martin Schwarz,Gary Gibson
ZooKeys , 2013, DOI: 10.3897/zookeys.262.3857
Abstract: Calymmochilus dispar Bou ek & Andriescu (Hymenoptera, Eupelmidae) and Gelis apterus (Pontoppidan) (Hymenoptera, Ichneumonidae) are newly recorded as parasitoids of the ant-eating spider Zodarion styliferum (Simon) (Araneae, Zodariidae). The larvae of both parasitoid species fed on juvenile spiders. The final instar larva and pupa of C. dispar and the male of G. apterus are described for the first time. Both species represent new distribution records for Portugal. The biology and host associations of the parasitoids are discussed.
A New Fairness-Oriented Packet Scheduling Scheme with Reduced Channel Feedback for OFDMA Packet Radio Systems  [PDF]
Stanislav NONCHEV, Mikko VALKAMA
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.27068
Abstract: In this paper, we propose a flexible and fairness-oriented packet scheduling approach for 3GPP UTRAN long term evolution (LTE) type packet radio systems, building on the ordinary proportional fair (PF) scheduling principle and channel quality indicator (CQI) feedback. Special emphasis is also put on practical feedback reporting mechanisms, including the effects of mobile measurement and estimation errors, reporting delays, and CQI quantization and compression. The performance of the overall scheduling and feedback re-porting process is investigated in details, in terms of cell throughput, coverage and resource allocation fairness, by using extensive quasistatic cellular system simulations in practical OFDMA system environment with frequency reuse of 1. The performance simulations show that by using the proposed modified PF ap-proach, significant coverage improvements in the order of 50% can be obtained at the expense of only 10-15% throughput loss, for all reduced feedback reporting schemes. This reflects highly improved fairness in the radio resource management (RRM) compared to other existing schedulers, without essentially com-promising the cell capacity. Furthermore, we demonstrate the improved functionality increase in radio re-source management for UE’s utilizing multi-antenna diversity receivers.
Hydrochemical Peculiarities of Bog Ecosystems in the North-Siberian Lowland  [PDF]
Tamara Efremova, Stanislav Efremov
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.27077
Abstract: Surface waters of eutrophic bogs (fens) in the North-Siberian (Taimyr) lowland are characterized by hydrocarbonate, sulfate as well as hydro carbonate-sulfate calcium-magnesium composition. They relate to the type of oxygen waters, mainly, to the class of neutral weakly alkaline and to the family of ultrafresh and fresh waters and to the kind of waters poor with dissolved organic matter. Natural hydrochemical background of bog ecosystems makes in heavy metals in the first approximation: Co–0.16, Pb–0.57, Ni–4.67 and Cu–5.94 mkg/L. In most cases the surface waters are not polluted by heavy metals. Bog waters located in immediate closeness from Norilsk mining and smelting industrial complex are polluted by nickel at mid-level.
Reconstruction Parameters of Local Scattering Sources of a Metallic Strip from the Backscattering Pattern  [PDF]
Stanislav N. Kutishchev
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.412069
Abstract: In this paper, it is proved the ability of quantity reconstruction, amplitudes and coordinates of metallic strip local scattering sources from the backscattering pattern. They are performed as the results of numerical solution for the infinite perfect conducting strip in case of E-polarization of the incident plane electromagnetic wave. In this case it is necessary to fulfill the following conditions. The local sources amplitudes should be the same order, in transverse and longitudinal directions the local sources should be separated into distances more than apparatus resolution, and the object maximum size does not have to be more than approximately 50λ. It was shown the limit and ability of the further development of the offered method.
Hamiltonian of Acoustic Phonons in Inhomogeneous Solids  [PDF]
Stanislav Minarik, Vladimir Labas
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.43052
Abstract:

Theoretical solid-state physicists formulate their models usually in the form of a Hamiltonian. In quantum mechanics, the Hamilton operator \"\"(Hamiltonian) is of fundamental importance in most formulations of quantum theory. Mentioned operator corresponds to the total energy of the system and its spectrum determines the set of possible outcomes when one measures the total energy. Interpretation of results obtained by the applying of models based on the Hamiltonian indicates very specific mechanisms of some observed phenomena that are not fully consistent with the experience. Such approach may occasionally lead to surprises when obtained results are confronted with expectations. The aim of this work is to find Hamilton operator of acoustic phonons in inhomogeneous solids. The transport of energy in the vibrating crystal consisting of ions whose properties differ over long distances is described in the work. We modeled crystal lattice by 1D inhomogeneous ionic chain vibrating by acoustic frequencies and found the Hamiltonian of such system in the second quantization. The influence of long-distance inhomogeneities on the acoustic

Optical Fiber Sensor with Distributed Parameters Based on Optical Fiber Reflectometry
Branislav Korenko,Jozef Jasenek,Jozefa Cervenova,Marek Hlavac
Advances in Electrical and Electronic Engineering , 2011,
Abstract: His paper deals with the two-stage two-phase electronic systems with orthogonal output voltages and currents - DC/AC/AC. Design of two-stage DC/AC/AC high frequency converter with two-phase orthogonal output using single-phase matrix converter is also introduced. Output voltages of them are strongly nonharmonic ones, so they must be pulse-modulated due to requested nearly sinusoidal currents with low total harmonic distortion. Simulation experiment results of matrix converter for both steady and transient states for IM motors are given in the paper, also experimental verification under R-L load, so far. The simulation results confirm a very good time-waveform of the phase current and the system seems to be suitable for low-cost application in automotive/aerospace industries and application with high frequency voltage sources.
The implementation of library automation in the Slovene National and university library and other libraries: development and setting-up of the referral service system in former Yugoslavia
Stanislav Bahor
Knji?nica : Revija za Podro?je Bibliotekarstva in Informacijske Znanosti , 2006,
Abstract: The article describes the development and co-ordination of the design and implementation of library automation into the information and documentation activities in former Yugoslavia from 1974 to the middle of 1981. During this period, a state-wide uniform referral system was planned to be created in accordance with the international guidelines. In agreement with the Yugoslav scientific policy guidelines, the operational information system for the scientific information system should be based on specialized and referral centres, in which the modern computer technology should be implemented. In former Yugoslavia, the self-managing agreement on referral work was adopted, and in many cases, holders of the referral work became national libraries in the republics and autonomous provinces, because they collected the creative achievements of the complete nation, and they provided the most favourable conditions for the best exploitation of library collections and other information resources. Closer co-operation between the institutions, which operated in the field of information activities at the state level, also encouraged the unification of standards for a more rational work distribution and provision of exchange and accessibility of work results. An analysis of the situation and a development programme for the scientific information system were to be carried out in former Yugoslavia, however, a complicated system of reaching the agreement on the measures to be taken and difficult economic situation of the state did not enable a quick progress in this field.
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