537 research outputs found
About our meetings with V.G. Petrenko
No full textThe meetings and collaboration of the author with untimely deceased V.G. Petrenko are discussed in the note
About our meetings with V.G. Petrenko
No full textThe meetings and collaboration of the author with untimely deceased V.G. Petrenko are discussed in the note
Experimental poetics of “The adventures of the Electric Harlequin” by V.G. Shershenevich: the genre features
No full textThe article is devoted to the genre features in the insufficiently explored work "The Adventures of the Electric Harlequin" by imaginist V.G. Shershenevich. The author of the article identifies the signs of the commedia dell'arte, the tragic farce, the farcical action, the "drama for reading", the elements of poetry and drama. The author concludes syncretic nature of genre in this work
Efficient pricing of barrier options with the variance-gamma model
No full textWe develop an efficient Monte Carlo algorithm for pricing barrier options with the variance gamma model [fMAD98a]. After generalizing the double-gamma bridge sampling algorithm of [fAVR03a], we develop conditional bounds on the process paths and exploit these bounds toprice barrier options. The algorithm's efficiency stems from sampling the process paths up to a random resolution that is usually much coarser than the original path resolution. We obtain unbiased estimators, including the case of continuous-time monitoring of the barrier crossing. Our numerical examples show large efficiency gain relative to full-dimensional path sampling
Literary Portrait of V.G. Shershenevich in the Works of Barnaul Writers
No full textImaginist poet V.G. Shershenevich died and was buried in 1942 in Barnaul. The fact of the death and burial of the capital’s author in a provincial town has become a landmark event for regional self-identification, and initiated a particular thematic line in local history and fiction. For the first time the article reveals the image of V.G. Shershenevich, which was developed in the work of Barnaul writers. The analysis of poetic and prose texts shows how the reconstruction of the last days of the poet’s life fits him into the urban landscape, how the grave becomes a semantically productive element of the locus. The basic motifs that model the image of the writer are associated with the change of poles of the oppositions “center — periphery,” “glory — oblivion,” “friend — alien (foreign),” “genius – mediocrity,” “friendship — enmity” with S.A. Yesenin. Literary portrait of Shershenevich comes from the synthesis of the features of his poetics, aesthetic attitudes, life events and the realities of the city. Altai writers tend to project literary and historical facts related to the imagist onto their own work and destiny. There is a tendency to turn the poet into a genius loci
INTERNAL FEEDBACK MECHANISMS OF OPTOELECTRONIC BISTABILITY IN CADMIUM SULFIDE
No full textTwo mechanisms of internal feedback in cadmium sulfide in electric field have been studied, namely, thermal shift of absorption lines and electron state transformation due to multiparticle interaction in the high carrier concentration system
Teaching officials of Volynsky (Kremenetsky) Lyceum: V.G. Besser, A.I. Maevsky, F.I. Mekhovich
No full textАвтор вивчає життєвий шлях чиновників-педагогів Волинського лицею. Ообливість біографій у тому, що вони висвітлюють період життя досліджуваних діячів до 1832 р., коли навчальний заклад припинив своє існування.Автор изучает жизненный путь чиновников-педагогов Волынского лицея. Особенность биографий в том, что они освещают период жизни исследуемых деятелей до 1832 г., когда учебное заведение прекратило свое существование.This article is the first of all author’s series, dedicated to teaching officials of Volynsky Lyceum in the town of Kremenets. The service records dated 1832 found in the State Archive of Kharkovskaya Oblast, have been taken as a basis of the research work where the author studies the life journey of V.G. Besser, A.I. Maevsky, F.I. Mekhovich. What makes these biographies unique is that they feature CVs of aforesaid people before the year 1832. This year marked the dissolvent of Volynsky Liceum
Polarization revival of a Bloch oscillating wave packet in conjunction with resonant Zener tunneling
No full textWe investigate the dynamics of a Bloch-oscillating wave packet in the presence of strong coupling to delocalized above barrier states (Zener tunneling), using time-resolved intraband polarization-sensitive measurements. At a threshold electric field, the resonance of localized and delocalized states causes a quantum beating which is observed as a revival in the intraband polarization. Our numerical simulation visualizes the spatial wave packet decomposition and reformation. The wave packet moves on a ps time scale over a distance of more than 100 nm and sequentially undergoes Bloch oscillations in the below- and above-barrier bands
Nonlinear transport in superlattices: Bloch oscillations and Zener breakdown
No full textSemiconductor superlattices have been intensively used as a model system for the investigation of high field transport in solids. Here, we discuss ultrafast optical experiments which allow us to monitor the electron wave packet motion in detail. First, we discuss a novel technique which directly traces the center of mass spatial motion. We use this method for the detection of a linear motion of the wave packets, which is superimposed on the harmonic Bloch oscillations. A comparison with theory shows that this coherent analog to the Shapiro effect in superconductors is associated with gain at THz frequencies. In a second part, we discuss recent results which address the Zener breakdown due to tunneling to higher bands by linear spectroscopy, which directly shows the wave function delocalization. We also trace the dynamics of the Zener tunneling by time-resolved spectroscopy and show the damping of Bloch oscillations due to Zener tunneling
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