Seliverstov S., Rusova A., Kaurova N. et al. Journal of Physics: Conference Series. 2016. Vol. 741. No. 1. P. 012165.
We characterize superconducting antenna-coupled NbN hot-electron bolometer (HEB) for direct detection of THz radiation operating at a temperature of 9.0 K. At signal frequency of 2.5 THz, the measured value of the optical noise equivalent power is 2.0×10-13 W-Hz-0.5. The estimated value of the energy resolution is about 1.5 aJ. This value was confirmed in the experiment with pulsed 1.55-μm laser employed as a radiation source. The directly measured detector energy resolution is 2 aJ. The obtained risetime of pulses from the detector is 130 ps. This value was determined by the properties of the RF line. These characteristics make our detector a device-of-choice for a number of practical applications associated with detection of short THz pulses.
Added: Oct 20, 2016
Finkel M., Maslennikov S., Smirnov K. et al. IEEE Transactions on Applied Superconductivity. 2014. Vol. 25. No. 3.
Added: Mar 2, 2015
Shurakov A., Lobanov Y., Rodin A. V. et al. Optics Letters. 2014. Vol. 39. No. 6.
We report on the development of a highly sensitive optical receiver for heterodyne IR spectroscopy at the communication wavelength of 1.5 μm (200 THz) by use of a superconducting hot-electron bolometer. The results are important for the resolution of narrow spectral molecular lines in the near-IR range for the study of astronomical objects, as well as for quantum optical tomography and fiber-optic sensing. Receiver configuration as well as fiber-to-detector light coupling designs are discussed. Light absorption of the superconducting detectors was enhanced by nano-optical antennas, which were coupled to optical fibers. An intermediate frequency (IF) bandwidth of about 3 GHz was found in agreement with measurements at 300 GHz, and a noise figure of about 25 dB was obtained that was only 10 dB above the quantum limit.
Added: Mar 2, 2015
Marshakov A., Fock V. arxiv.org. math. Cornell University, 2014
We describe a class of integrable systems on Poisson submanifolds of the affine Poisson-Lie groups PGLˆ(N), which can be enumerated by cyclically irreducible elements the co-extended affine Weyl groups (Wˆ×Wˆ)♯. Their phase spaces admit cluster coordinates, whereas the integrals of motion are cluster functions. We show, that this class of integrable systems coincides with the constructed by Goncharov and Kenyon out of dimer models on a two-dimensional torus and classified by the Newton polygons. We construct the correspondence between the Weyl group elements and polygons, demonstrating that each particular integrable model admits infinitely many realisations on the Poisson-Lie groups. We also discuss the particular examples, including the relativistic Toda chains and the Schwartz-Ovsienko-Tabachnikov pentagram map.
Added: Oct 29, 2014
2015.
Added: Aug 10, 2015
М.: МИЭМ НИУ ВШЭ, 2016.
Added: Mar 7, 2016
Sadovskii M. V.,
Pudalov V.M. Journal of Superconductivity and Novel Magnetism. 2016. Vol. 29. No. 4.
P. 1035-1036.
Added: Feb 23, 2017
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Added: Feb 3, 2017
Zlotnik Alexander, Zlotnik Ilya. arxiv.org. math. Cornell University, 2014. No. arXiv:1405.3147.
We consider the Cauchy problem for the 1D generalized Schrödinger equation on the whole axis. To solve it, any order finite element in space and the Crank-Nicolson in time method with the discrete transpa\-rent boundary conditions (TBCs) has recently been constructed. Now we engage the Richardson extrapolation to improve significantly the accuracy in time step. To study its properties, we give results of numerical experiments and enlarged practical error analysis for three typical examples. The resulting method is able to provide high precision results in the uniform norm for reasonable computational costs that is unreachable by more common 2nd order methods in either space or time step. Comparing our results to the previous ones, we obtain much more accurate results using much less amount of both elements and time steps.
Added: May 14, 2014
Балашов В. А., Злотник А.А., Савенков Е. Б. Институт прикладной математики им. М.В. Келдыша Российской академии наук, 2016. № 89.
A study of the barotropic quasi-hydrodynamic system of equations for the two-phase two-component mixture involving the surface tension and stationary potential force is accomplished. Under fairly general assumptions on the Helmholtz free energy of the mixture, the~energy balance equation with non-positive energy production together with its corollary, the law of non-increasing total energy, are derived; in particular, both the isothermal and isentropic cases are covered. Under additional assumptions, the necessary and sufficient conditions for the linearized stability of constant solutions are derived (it does not take place always). A finite-difference approximation of the problem is constructed in the 2D periodic case for a non-uniform rectangular mesh. Approximation of the capillary stress tensor is improved in the momentum balance equation thus increasing the quality of numerical solutions. The results of numerical experiments are presented. They demonstrate the ability of the model to ensure the qualitatively correct description for the dynamics of surface effects as well as applicability of the linearized stability criterion in the original nonlinear statement.
Added: Sep 30, 2016
Novikov L., Mileev V., Voronina E. et al. Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques. 2009. Vol. 3. No. 2. P. 199-214.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
Added: Mar 2, 2015
Dudin A. Vol. 356: Modern Probabilistic Methods for Analysis of Telecommunication Networks. Belorusian Winter Workshops in Queueing Theory, BWWQT 2013 . Heidelberg; NY; Dordrecht; L.: Springer Verlag, 2013.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
Added: Jul 21, 2013
Гунько М., Зотова М.,
Кашницкий И. С. и др. М.: Институт географии РАН, 2013.
Added: Dec 12, 2013
The paper aims at assessing indicators and individual elements of e-government of selected countries in 2009-2010, and the interrelation of e-government with corruption in the public sector. The authors explore possible causal and dependency relations of the established interlink between e-government and public sector corruption. Although it is universally acknowledged that corruption is an evil, there is much debate over which determinants of corruption are important. Using econometric analysis for sizeable country samples the authors verified the closeness of interrelation between e-government indicators and ICT Development Index indicators, such as online services quality and ICT usage, on one hand, and the level of perceived public sector corruption, on the other hand. The major research papers were analyzed, along with international rankings and databases of international organizations. Based on the analysis recommendations for overcoming international e-government measurement constraints are put forward, as well as suggestions for future studies of the topic.
Added: Mar 4, 2013
Лемешко Н. В., Захарова С. С. Труды Научно-исследовательского института радио. 2013. № 1. С. 40-45.
Added: Dec 16, 2013
Karpov A. V. Science, Technology and Innovation. WP BRP. Высшая школа экономики, 2012. No. 03.
The publication credit allocation problem is one of the fundamental problems in bibliometrics. The solution of this problem provides the basis of further research. There are two solutions which do not require any additional information: equal weights measure and Shapley value. Until recently Shapley value is not used because of hardness of computing. The paper justifies the equal weights measure by showing equivalence with the Shapley value approach for sharing coauthors performance in specific games.
Added: Jan 17, 2013
Кн. 2: Разработка моделей надёжности для проектных исследований надёжности радиоэлектронной аппаратуры. М.: МИЭМ, 2010.
Added: Feb 12, 2013
Захарова С. С., Лемешко Н. В. Труды Научно-исследовательского института радио. 2012. № 4. С. 48-54.
Added: Dec 16, 2013
Gokhberg L.,
Fursov K.,
Perani G. Working Party of National Experts on Science and Technology Indicators. DSTI/EAS/STP/NESTI. Organisation for Economic Co-operation and Development, 2012. No. DSTI/EAS/STP/NESTI(2012)9/ANN1.
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.
Added: Jan 9, 2013