331 research outputs found
Horizontal Pressure Gradient Parameterization for One-Dimensional Lake Models
No full textThis work presents a new method for closure of horizontally averaged 1-D thermohydrodynamic equations in an enclosed reservoir by parameterizing the horizontal pressure gradient usually omitted in 1-D lake models. Horizontal pressure gradient is computed using an auxiliary multilayer model where horizontal structure of speed and pressure is given by 1-st Fourier mode. A major effect of new parameterization in 1-D lake model is the emergence of explicitly reproduced H1 seiche modes. The parameterization is implemented in the LAKE model, with minor (2–4%) extra computational cost imposed. The model is applied to Lake Iseo (Italy), and calculated temperature series are compared to measured ones in upper, middle, and deep portions of metalimnion. The amplitude of seiche-induced temperature oscillations well matched the observed amplitude by tuning the bottom friction coefficient only. The synoptic variability of thermocline vertical displacement caused by wind events is well reproduced by the model. The dominant peak of quasi-diurnal period in temperature power spectrum was captured in simulations as well. Using the new parameterization of horizontal pressure gradient extends the applicability of a 1-D lake model formulation to small lakes, which size is less than internal Rossby radius, and where pressure gradient dominates over Coriolis force
PICES Press, Vol. 20, No. 1, Winter 2012
No full text•2011 PICES Science: A Note from the Science Board Chairman (pp. 1-6)
•2011 PICES Awards (pp. 7-9)
•Beyond the Terrible Disaster of the Great East Japan Earthquake (pp. 10-12)
•A New Era of PICES-ICES Scientific Cooperation (p. 13)
•New PICES Jellyfish Working Group Formed (pp. 14-15)
•PICES Working Group on North Pacific Climate Variability (pp. 16-18)
•Final U.S. GLOBEC Symposium and Celebration (pp. 19-25)
•2011 PICES Rapid Assessment Survey (pp. 26-29)
•Introduction to Rapid Assessment Survey Methodologies
for Detecting Non-indigenous Marine Species (pp. 30-31)
•The 7th International Conference on Marine Bioinvasions (pp. 32-33)
•NOWPAP/PICES/WESTPAC Training Course on
Remote Sensing Data Analysis (pp. 34-36)
•PICES-2011 Workshop on “Trends in Marine
Contaminants and their Effects in a Changing Ocean” (pp. 37-39)
•The State of the Western North Pacific in the First Half
of 2011 (pp. 40-42)
•Yeosu Symposium theme sessions (p. 42)
•The Bering Sea: Current Status and Recent Events (pp. 43-44)
•News of the Northeast Pacific Ocean (pp. 45-47)
•Recent and Upcoming PICES Publications (p. 47)
•New leadership for the PICES Fishery Science Committee (p. 48
МУЗИЧНІ ЧАРІВНОСТІ М. СТЕПАНЕНКА В НАВЧАЛЬНОМУ ПРОЦЕСІ
No full textThe author considers features of musical language planistic M. Stepanenko\u27s products, use of the basic means of musical expressiveness for a complete reconstruction of figurative dramatic art of the musical text
Group Delay measurements of ultrabroadband pulses generated in highly nonlinear fibers
No full textUltra broadband supercontinuum pulses are commonly used as a source of different wavelengths from a wide spectral bandwidth or as a source of very short pulses. However the processes responsible for wide spectral broadening are still under investigation. In this paper we examine the temporal and spectral characteristics of the pulses broadened upon propagation in the highly nonlinear photonics crystal fibers with different dispersion profiles. Generated supercontinuum pulses were experimentally characterized using cross-correlation frequency resolved optical gating technique. Full Text: PDF ReferencesM. Bradler, P. Baum, and E. Riedle, "Femtosecond continuum generation in bulk laser host materials with sub-?J pump pulses", Appl. Phys. B 97, 561 (2009). CrossRef T. M. Kardas, B. Ratajska-Gadomska, W. Gadomski, A. Lapini, and R. Righini, "The role of stimulated Raman scattering in supercontinuum generation in bulk diamond", Opt. Express 21, 24201 (2013). CrossRef A. Brodeur and S. L. Chin, "Band-Gap Dependence of the Ultrafast White-Light Continuum", Phys. Rev. Lett. 80, 4406 (1998). CrossRef R. R. Alfano, ed., The Supercontinuum Laser Source: Fundamentals with Updated References, 2nd ed (Springer, 2006). DirectLink A. L. Gaeta, Phys. "Catastrophic Collapse of Ultrashort Pulses", Rev. Lett. 84, 3582 (2000). CrossRef J. M. Dudley, G. Genty, and S. Coen, "Supercontinuum generation in photonic crystal fiber", Rev. Mod. Phys. 78, 1135 (2006). CrossRef M. Klimczak, B. Siwicki, P. Skibinski, D. Pysz, R. Stepien, A. Heidt, C. Radzewicz, and R. Buczynski, "Coherent supercontinuum generation up to 2.3 ?m in all-solid soft-glass photonic crystal fibers with flat all-normal dispersion", Opt. Express 22, 18824 (2014). CrossRef D. J. Kane and R. Trebino, "Characterization of arbitrary femtosecond pulses using frequency-resolved optical gating", IEEE J. Quantum Electron. 29, 571 (1993). CrossRef J. Dudley, X. Gu, L. Xu, M. Kimmel, E. Zeek, P. O'Shea, R. Trebino, S. Coen, and R. Windeler, "Cross-correlation frequency resolved optical gating analysis of broadband continuum generation in photonic crystal fiber: simulations and experiments", Opt. Express 10, 1215 (2002). CrossRef N. Nishizawa and T. Goto, "Experimental analysis of ultrashort pulse propagation in optical fibers around zero-dispersion region using cross-correlation frequency resolved optical gating", Opt. Express 8, 328 (2001). CrossRef X. Gu, L. Xu, M. Kimmel, E. Zeek, P. O'Shea, A. P. Shreenath, R. Trebino, and R. S. Windeler, "Frequency-resolved optical gating and single-shot spectral measurements reveal fine structure in microstructure-fiber continuum", Opt. Lett. 27, 1174 (2002). CrossRef S. Roy, S. K. Bhadra, and G. P. Agrawal, "Effects of higher-order dispersion on resonant dispersive waves emitted by solitons", Opt. Lett. 34, 2072?2074 (2009). CrossRef S. Bose, S. Roy, R. Chattopadhyay, M. Pal, and S. K. Bhadra, "Experimental and theoretical study of red-shifted solitonic resonant radiation in photonic crystal fibers and generation of radiation seeded Raman soliton", J. Opt. 17, 105506 (2015). CrossRef T. Roger, M. F. Saleh, S. Roy, F. Biancalana, C. Li, and D. Faccio, "High-energy, shock-front-assisted resonant radiation in the normal dispersion regime", Phys. Rev. A 88, (2013). CrossRef G. P. Agrawal, Nonlinear Fiber Optics, Fifth edition (Elsevier/Academic Press, 2013). DirectLink J. Szczepanek, T. Kardas, M. Nejbauer, C. Radzewicz, and Y. Stepanenko, "Simple all-PM-fiber laser system seeded by an all-normal-dispersion oscillator mode-locked with a nonlinear optical loop mirror", Proc. SPIE 9728, 972827 (2016). CrossRef C. Iaconis and I. A. Walmsley, "Self-referencing spectral interferometry for measuring ultrashort optical pulses", IEEE J. Quantum Electron. 35, 501 (1999). CrossRef L. E. Hooper, P. J. Mosley, A. C. Muir, W. J. Wadsworth, and J. C. Knight, "Coherent supercontinuum generation in photonic crystal fiber with all-normal group velocity dispersion", Opt. Express 19, 4902 (2011). CrossRef J. Szczepanek, T. M. Kardas, and Y. Stepanenko, "Sub-160-fs pulses dechriped to its Fourier transform limit generated from the all-normal dispersion fiber oscillator", Optical Society of America Frontiers in Optics conference, FTu3C?2 (2016). CrossRef G. Genty, M. Lehtonen, and H. Ludvigsen, "Effect of cross-phase modulation on supercontinuum generated in microstructured fibers with sub-30 fs pulses", Opt. Express 12, 4614 (2004). CrossRef S. Roy, S. K. Bhadra, K. Saitoh, M. Koshiba, and G. P. Agrawal, "Dynamics of Raman soliton during supercontinuum generation near the zero-dispersion wavelength of optical fibers", Opt. Express 19, 10443 (2011). CrossRef Y. Liu, Y. Zhao, J. Lyngso, S. You, W. L. Wilson, H. Tu, and S. A. Boppart, "Suppressing Short-Term Polarization Noise and Related Spectral Decoherence in All-Normal Dispersion Fiber Supercontinuum Generation", J. Light. Technol. 33, 1814 (2015). CrossRef</jats:p
Compendiums of knowledge associated with linguistic terminology and linguists: history, classification features, and genre polyfunctionality
No full textThe author explores the historical development of Ukrainian linguistic terminology within the framework of national terminography, lexicography, encyclopediography. The article reviews and analyses the academic references encomprassing 1) nationally specific and borrowed terms as well as concepts in traditional and emerging linguistics branches (e.g., the Dictionary of Linguistic Terms by Ye. Krotevych and N. Rodzevytch; Dictionary of Linguistic Terms by D. Hanych and I. Oliinyk; Dictionary of Modern Linguistics: Concepts and Terms; Modern Linguistic Dictionary by A. Zahnitko; Ukrainian. Concise Dictionary of Linguistic Terms by S. Yermolenko, S. Bybyk, and O. Todor; Modern Linguistics: Terminological Encyclopedia by O. Selivanova; The Ukrainian Language. Encyclopaedia; etc.), and 2) personalities of Ukrainian linguists (e.g., Ukrainian Grammar in Names by A. Zahnitko, M. Balko; Nizhyn Linguistics by N. Boiko, S. Zinchenko, A. Kaidash; etc.). The author systemizes and classifies encyclopedic works based on different criteria in the classical way (according to nature of information: domain, subject-specific, biographical, personal works; according to target audience: professional linguistics, student philologists, applicants, pupils; according regional focus of linguistic conceptions: the Nizhyn region, the Poltava region; according to article structure: alphabetical, alphabetical-and-clustered), as well as in the new way (syncretism of linguistic and encyclopedic genres: subject-specific linguistic-and-encyclopedic-and-biographic works, domain regional-and-biographic ones, subject-specific regional-and-biographic ones). The universal and specific principles of forming the definitional part of both linguistic-encyclopedic and encyclopedic articles include interpretation by an author, macro- and mini-discursive cross-references, hyperlinks, scholarly inter-texts, novelty, debatable issues personal and bibliographic remarks, and global linguistic experience
Classification of Innovations and Its Standardization in the Republic of Belarus
No full textApproaches to a classification of innovations that exist in economic literature are considered in the paper. On the basis of their generalization the author has developed his own variant of such classificatioiL It is proposed to standardize the classification of innovations and its coding at the national level in order to promote introduction of state-of-the-art innovations by home enterprises
Topological States of Interacting Photon Pairs Emulated in a Topolectrical Circuit
No full textIn the present work, we study the formation of topological edge states of bound photon pairs, doublons. We consider a one-dimensional array of optical microresonators with tunneling nearest-neighbor couplings, with two photons traveling along the array. Considering the interaction between photons that share the same resonator and taking into account two-photon tunneling processes, we construct a system that supports topological edge states of doublons and does not support any edge states in the single-photon regime. Thus, we provide an example of interaction-induced topological states of quantum light. To illustrate our findings, we perform an analog emulation of the proposed system applying topolectrical circuit platform. We demonstrate that the eigenstates of the Hamiltonian describing initial two-particle quantum problem can be exactly mapped to the eigenmodes of a two-dimensional classical electric circuit composed of inductors and capacitors. We realize such a circuit working at kHz frequencies and study it experimentally. After obtaining the signatures of the two-photon edge state in the resonance spectrum of the circuit, we perform a reconstruction of the corresponding eigenmode and thus provide the direct evidence of the edge state formation. To demonstrate the topological origin of this doublon edge state, we extract the associated topological invariant directly from the experimental data. Obtained experimental results fully support our theoretical predictions and provide valuable insights into topological protection in interacting quantum systems and its emulation with classical setups
Topological edge states of interacting photon pairs emulated in a topolectrical circuit
No full textTopological physics opens up a plethora of exciting phenomena allowing to engineer disorder-robust unidirectional flows of light. Recent advances in topological protection of electromagnetic waves suggest that even richer functionalities can be achieved by realizing topological states of quantum light. This area, however, remains largely uncharted due to the number of experimental challenges. Here, we take an alternative route and design a classical structure based on topolectrical circuits which serves as a simulator of a quantum-optical one-dimensional system featuring the topological state of two photons induced by the effective photon-photon interaction. Employing the correspondence between the eigenstates of the original problem and circuit modes, we use the designed simulator to extract the frequencies of bulk and edge two-photon bound states and evaluate the topological invariant directly from the measurements. Furthermore, we perform a reconstruction of the two-photon probability distribution for the topological state associated with one of the circuit eigenmodes
Київські дні Анни Горенко
No full textThe paper considers the early period of Anna Akmatova’s life and work. The author covers Anna Akmatova’s relationships with M. Gumiliov and other known Kyiv intellectuals and artists. The article also deals with the artistic context of the life of the city in those times, namely the activity of the magazine “The world of art”.У статті йдеться про ранній період життя і творчості Анни Ахматової. Розглянуто її стосунки з М. Гумільовим і відомими представниками київської творчої інтелігенції, висвітлено тодішній мистецький контекст міста, зокрема діяльність журналу “В мире искусств”
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