A5076359804- Crystallography and Radiation Phenomena
- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
- Terahertz technology and applications
- Nuclear materials and radiation effects
- Seismic Waves and Analysis
- Pulsars and Gravitational Waves Research
- Advanced X-ray Imaging Techniques
- Electromagnetic Effects on Materials
- Astrophysics and Cosmic Phenomena
- Electromagnetic Simulation and Numerical Methods
- Electromagnetic Scattering and Analysis
- Plasmonic and Surface Plasmon Research
- Quantum and Classical Electrodynamics
- Muon and positron interactions and applications
- Geophysics and Gravity Measurements
- Combustion and Detonation Processes
- Photonic Crystals and Applications
- Laser-Plasma Interactions and Diagnostics
- Quantum Electrodynamics and Casimir Effect
- Earthquake Detection and Analysis
- Geophysics and Sensor Technology
- Neutrino Physics Research
- Geophysical Methods and Applications
- Near-Field Optical Microscopy
Institute for Informatics and Automation Problems
2008-2024
Armenian National Agrarian University
2024
National Academy of Sciences of Armenia
2015-2023
Yerevan State University
1999
Agriculture productivity is severely hampered by salinity stress in many parts of the world, including Ararat Plain Armenia. The need for food security growing worldwide, and new strategies are essential to meet this challenge. In context Plain, paper examines potential utility promising role biogenic nanoparticles (NPs) biochar reducing stress, boosting crop resilience, guaranteeing sustainable production. This involves mechanisms underlying as well properties synthesis biochar, their...
This study examines the adaptation of an undocumented halophyte, Dandur, to salt stress in different soil mediums. The Dandur plant physiological, morphological, and biochemical analyses show that it can withstand salinity stress. plants grown clay loam experienced significant decreases height stem diameter under extreme conditions compared non-saline soil. fresh weight root shoot decreased by 70.4% 84.8%, respectively, dry 48.5% 79.7%. These findings underscore importance maintaining saline...
Abstract We investigate the quasi-coherent radiation from a train of electron bunches moving along axis cylindrical waveguide, assuming that part waveguide is filled with dielectric medium. For permittivity latter, general case dispersion considered. It shown under certain conditions on medium and values problem parameters, modes become equidistant. As consequence, Cherenkov may be generated first several simultaneously. An example law provided for which corresponding suppressed.
Abstract Analytical study and summarization of dynamic frequency characteristics the seismic-acoustic vibrations originated by near distant earthquakes other natural artificial seismic processes, as well information analyses their duration repetition were done. These allow formulation appropriate technical requirements for recording devices, to analyze evaluate possibilities implementing various methods devices signals from different processes depending also on seismological tasks be solved...
Abstract We investigate the Cherenkov radiation by a charge uniformly moving inside dielectric cylindrical channel in homogeneous medium. The expressions for Fourier components of electric and magnetic fields are derived using electromagnetic field Green tensor. spectral distribution intensity exterior medium is studied general case frequency dispersion interior functions. It shown that, under certain conditions on permittivities, strong narrow peaks appear distribution. locations those...
The radiation from a relativistic electron uniformly moving along the axis of cylindrical waveguide filled with laminated material finite length is investigated. Expressions for spectral distribution passing throw transverse section at large distances are derived no limitations on amplitude and variation profile layered medium permittivity permeability. Numerical results consisting dielectric plates alternated vacuum gaps given. It shown that special choice problem parameters, Cherenkov...
We investigate the radiation from a charged particle moving outside dielectric cylinder parallel to its axis. It is assumed that immersed into homogeneous medium. The expressions are given for vector potential and electric magnetic fields. spectral distributions studied three types of radiation: (i) Cherenkov (CR) in exterior medium, (ii) on guided modes cylinder, (iii) emission surface polaritons. Unlike first two radiation, there no velocity threshold generation corresponding present range...
The radiation from a charged particle-in-flight semi-infinite laminated medium to vacuum and back,- the medium, has been investigated. Expressions for spectral-angular distribution of energy in (at large distances boundary medium) were obtained both cases with no limitations on amplitude variation profile permittivity. results appropriate numerical calculations are presented possible applications discussed.
We investigate the radiation from a bunch of relativistic electrons moving along cylindrical waveguide axis, assuming that is partially loaded by medium with periodic dielectric permittivity and magnetic permeability. The spectral distribution energy flux through cross section studied at large distances medium. analysis based on corresponding exact solution Maxwell equations for case single electron axis. results numerical calculations are presented in special layered consisting finite...
The radiation from a charged particle uniformly revolving along shifted equatorial orbit about dielectric ball has been investigated. results of numerical calculations based on exact solutions Maxwell equations with due regard for losses energy within the material testify that (a) definite "resonant" values revolution frequency relativistic electron may generate microwave Cherenkov at first harmonic, is approximately 900-1100 times more intensive than synchrotron generated same in vacuum and...
A relativistic electron uniformly rotating along an equatorial orbit around a dielectric ball may generate Cherenkov radiation tens of times more intense as that in case revolution particle continuous, infinite and transparent medium. The root-mean-square values electric magnetic field strengths are practically not localized the central part plane close to poles ball.
We investigate the emission of surface polaritons (SPs) by a charged particle moving inside dielectric cylinder parallel to its axis. It is assumed that immersed into homogeneous medium with negative permittivity in spectral range under consideration. The SP modes are present for positive function material. In order find electromagnetic fields corresponding SPs, respective contributions components Green tensor separated. expressions scalar and vector potentials electromagnetic-field...
We study the angular distribution of radiation from a relativistic charged particle uniformly rotating along an equatorial orbit around dielectric ball. Earlier it was shown that for some values problem parameters and in case weak absorption ball material, intensity on given harmonic can be essentially larger than same charge vacuum or homogeneous transparent medium having real part permittivity as material. The generation such high power is consequence constructive superposition...