URBAN MUSIC OF ALEXANDRAPOLE AND KOMITAS

The ašugh society in Alexandrapol (now Gyumri) emerged and developed under the immediate effect of historical-cul­tural processes. This society carried out an important mission with the public acknowledgment it possessed. It was an embodiment of the new qualities in the Armenian national thought in all the spheres of the ašugh school: ideological, propagandistic, music-poetic, etc.Among the songs leaning towards the Near East ašugh traditions that constituted the huge heritage of about forty ašułs, the songs based on Armenian verses display the modal, prosodic and stylis­tic features of Armenian monodic music. My paper presents the criteria in the song-creation of the ašugh society of Al­exandrapol, which are fully in line with Komitas’s fundamental principles of Ar­menian national song art.  The ašugh society in Alexandrapol (now Gyumri) emerged and developed under the immediate effect of historical-cul­tural processes. This society carried out an important mission with the public acknowledgment it possessed. It was an embodiment of the new qualities in the Armenian national thought in all the spheres of the ašugh school: ideological, propagandistic, music-poetic, etc.Among the songs leaning towards the Near East ašugh traditions that constituted the huge heritage of about forty ašułs, the songs based on Armenian verses display the modal, prosodic and stylis­tic features of Armenian monodic music. My paper presents the criteria in the song-creation of the ašugh society of Al­exandrapol, which are fully in line with Komitas’s fundamental principles of Ar­menian national song art

CREATIVITY OF ARMENIAN ASHUGS IN THE CONTEXT OF URBAN CULTURE OF ASTRAKHAN

The article is devoted to the traditions of the center of Armenian ashugs in the city of Astrakhan, where an Armenian community existed in the Middle Ages. The urban cultural environment, where craft workshops and merchant and trading rows functioned, played an important role in the development of professional music of the ashughs. The creativity of the ashughs was very popular and carried sacred features of the national identity of the Armenians. The research was carried out with the financial support of the Higher Education and Science Committee of Ministry of Education, Science, Culture and Sport Republic of Armenia. Code: 21T-6E197, subject title “Armenian ashug art in a historical and critical light”

A new exactly integrable hypergeometric potential for the Schr\"odinger equation

We introduce a new exactly integrable potential for the Schr\"odinger equation for which the solution of the problem may be expressed in terms of the Gauss hypergeometric functions. This is a potential step with variable height and steepness. We present the general solution of the problem, discuss the transmission of a quantum particle above the barrier, and derive explicit expressions for the reflection and transmission coefficients

Pre-determining the location of electromigrated gaps by nonlinear optical imaging

In this paper we describe a nonlinear imaging method employed to spatially map the occurrence of constrictions occurring on an electrically-stressed gold nanowire. The approach consists at measuring the influence of a tightly focused ultrafast pulsed laser on the electronic transport in the nanowire. We found that structural defects distributed along the nanowire are efficient nonlinear optical sources of radiation and that the differential conductance is significantly decreased when the laser is incident on such electrically-induced morphological changes. This imaging technique is applied to pre-determined the location of the electrical failure before it occurs.Comment: 3 figure

Identifying and Disentangling Spurious Features in Pretrained Image Representations

Neural networks employ spurious correlations in their predictions, resulting in decreased performance when these correlations do not hold. Recent works suggest fixing pretrained representations and training a classification head that does not use spurious features. We investigate how spurious features are represented in pretrained representations and explore strategies for removing information about spurious features. Considering the Waterbirds dataset and a few pretrained representations, we find that even with full knowledge of spurious features, their removal is not straightforward due to entangled representation. To address this, we propose a linear autoencoder training method to separate the representation into core, spurious, and other features. We propose two effective spurious feature removal approaches that are applied to the encoding and significantly improve classification performance measured by worst group accuracy

Metal-Enhanced Fluorescence of Chlorophylls in Single Light-Harvesting Complexes

Ensemble and single-molecule spectroscopy demonstrates that both emission and absorption of peridinin−chlorophyll−protein photosynthetic antennae can be largely enhanced through plasmonic interactions. We find up to 18-fold increase of the chlorophyll fluorescence for complexes placed near a silver metal layer. This enhancement, which leaves no measurable effects on the protein structure, is observed when exciting either chlorophyll or carotenoid and is attributed predominantly to an increase of the excitation rate in the antenna. The enhancement mechanism comes from plasmon-induced amplification of electromagnetic fields inside the complex. This result is an important step toward applying plasmonic nanostructures for controlling the optical response of complex biomolecules and improving the design and functioning of artificial light-harvesting systems