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Aram Papoyan16/06/2025, 10:30
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David Bradley (University of Surrey and Sunway University)16/06/2025, 11:00
We are developing radioluminescence (RL) and passive light-generating systems for a range of applications, initial studies concerning doped silica optical fibers and time-resolved radiation dosimetry. Merits for biomedical interests include high spatial-and-temporal resolution, wide dynamic range, and real-time operability in various in vivo and ex vivo environments. For Ge-doped optical...
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Abdelmoneim Sulieman (King Saud bin Abdulaziz University for Health Sciences)16/06/2025, 11:40
Ionizing radiation, a classified carcinogenic agent, necessitates the implementation of robust radiation protection policies, regulations, and tools to ensure staff safety. Staff members, who work with or in proximity to radiation sources, face the risk of tissue reactions (cataracts and erythema) and cancer induction. To prevent these risks and reduce the probability of cancer and...
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Dmitry Roshchupkin (IMT HPM RAS)16/06/2025, 12:40
Application of methods of X-ray diffraction on laboratory and synchrotron radiation sources, scanning electron microscopy (SEM) allowed to investigate the process of excitation and propagation of different types of surface acoustic waves in piezoelectric crystals (Rayleigh surface acoustic waves, pseudo-surface acoustic waves, Lamb waves).
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While SEM method allows to visualize the acoustic... -
Aleksey Gogolev (Tomsk Polytechnic University)16/06/2025, 13:20
Overview of the undulator station 1-1 "Microfocus" SRF SKIF, including the implemented set of experimental methods, matched X-ray optical design, operating modes, experimental scenarios and expected parameters of radiation beams on the sample. Optical and thermal-mechanical solutions are substantiated, achievable spatial resolutions are estimated. The feasibility of combining "coherent" and...
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Danilo Giulietti16/06/2025, 14:00
The physical processes underlying the high-intensity LASER-matter interaction, the characteristics of the plasma produced, and the multiple applications allowed will be presented.
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Aram Saharian16/06/2025, 16:00
Dielectric cylindrical waveguides are widely used for confining and guiding of electromagnetic waves in relatively wide range of frequencies. They have found numerous technological and scientific applications in telecommunications, medicine, material science, photonics and quantum optics. In this presentation, we will discuss the applications of dielectric cylindrical waveguides in the...
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Giuseppe Dattoli (ENEA Frascati)16/06/2025, 16:40
Coherent sources of radiation, from “free” electrons, are playing a prominent role in Physics and applied science.
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Even though they are described as “non-conventional” lasers, they share a noticeable amount of physics with atomic or molecular lasers.
In this lecture we describe the possibility of developing a unified point of view to their treatment, by introducing an appropriate set of... -
Alessandro Curcio16/06/2025, 17:20
The theory of Coherent Stopping Power (CSP) of ultradense charged particle beams propagating in a dense matter is presented.
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CSP corresponds to a collective inelastic collision which adds to the ordinary stopping power of individual particles.
Unlike the latter, which depends only on the particles’ energy, CSP depends upon many more parameters such as the total charge of the ensemble and... -
Aram Petrosyan17/06/2025, 09:00
Various kinds of amino acid salts are known, which are interesting from both fundamental and applied points of view. In the present review crystals with dimeric, trimeric and tetrameric cations are considered. Crystals and structure types of salts with dimeric cations prevail; currently the following ones have been observed: (A+···A), A+(A+···A), [A(1)+···A(2)], A(1)+[A(2)+···A(2)],...
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Pavel Karataev (University of London (GB))17/06/2025, 09:40
Cherenkov diffraction radiation (ChDR) appears when a fast charged particle moves in the vicinity of and parallel to a dielectric interface. This is a member of polarization radiation family, because the radiation arises as a result of dynamic polarization of a medium. Coherent ChDR is generated in the wavelength range longer than or comparable to the longitudinal size of the bunch. In this...
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Alexey Tishchenko (National Research Nuclear University (MEPhI))17/06/2025, 10:20
Inverse Compton scattering, or as it is often called, Compton backscattering (CB) is one of the most classical and along with that modern subjects of intensive research. In this lecture I will reach out two main areas of research into Compton backscattering.
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First, this is the role of CB in astronomy as a source of information about the Universe: cosmic rays, the Sunyaev–Zeldovich effect and... -
Hayk Sarkisyan (Institute of Applied Problem of Physics)17/06/2025, 11:20
In my lecture I'll present recent results of the description the optical absorption in lens-shaped ellipsoidal and conical quantum dots for single particle as well as few-particle transitions. It'll be shown that for the specific geometries of quantum dots it is possible to use adiabatic description of such systems. We show that for the pair-interacting few-particle gas we can apply some of...
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Farhad Moradi (Multimedia University, Cyberjaya, Malaysia)17/06/2025, 12:00
High-dose-rate (HDR) brachytherapy relies on the precise positioning of a radioactive source through applicators or needles to deliver conformal dose distributions to tumors while sparing adjacent healthy tissue. However, most conventional treatment planning systems do not explicitly model the dose contribution during the entire source transit phase, including entry into the body, movement...
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Abdelmoneim Sulieman (King Saud bin Abdulaziz University for Health Sciences)17/06/2025, 12:40
According to the World Health Organization, Saudi Arabia ranked 26th among healthcare levels globally. In 2023, over 18 million radiology procedures were conducted in public and private hospitals. This study aims to estimate radiological procedures frequency and annual collective and per capita effective dose in 2023-2024. Information was collected from King Khalid Hospital, Alkharj, Saudi...
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Hrayr Margaryan17/06/2025, 16:30
This paper presents an experimental study of the formation mechanism of X-ray multi-beam diffraction moiré patterns. A unique four-block interferometer was designed, manufactured, and tested, that enabled successfully obtaining moiré patterns. The results of experimental studies on the dependence of moiré pattern formation on the number and history of contributing waves are presented. Unlike...
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Milena Petrosyan17/06/2025, 16:31
L-Ornithine is one of the amino acids able to establish both singly and doubly charged cations. Under certain conditions it can form salts with a dimeric cation (L-OrnH2•••L-OrnH)³⁺, as seen in the structures of (L-OrnH2•••L-OrnH)(Cl)2(ClO4) and (L-OrnH2•••L-OrnH)(Cl)2(NO3) [1], where doubly charged L-OrnH2 and singly charged L-OrnH cations are linked through a short O–H•••O type hydrogen...
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Minas Balyan (Yerevan State University, Institute of Physics)17/06/2025, 16:32
The double-slit dynamical X-ray diffraction in the transmitted and diffracted beams is investigated. The features and differences of the intensity distributions in both beams is investigated. The expressions for the period of the obtained interference fringes are found. The intensity distributions based on numerical calculations are presented and compared with theoretical predictions obtained...
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Levon Levonyan (Yerevan State University)17/06/2025, 16:33
According to the existing model, the low-angle twist boundary is a two-dimensional superlattice, formed by a net of two mutually perpendicular arrays of screw dislocations, so that in a given array the dislocations have the same Burgers vectors. In this work, we study the problem of spherical X-ray wave diffraction by a crystal with a low-angle twist boundary perpendicular to the crystal...
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Seryozha Movsisyan (Institute of Applied Problems of Physics)17/06/2025, 16:34
When an electromagnetic wave (EMW) and an acoustic wave (AW) propagate simultaneously in the same region of a crystal, an acousto-optic (AO) interaction arises between them.
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As an AW propagates through a crystal, it modulates its dielectric permittivity , which is the primary mechanism responsible for AO interaction, widely used in practical applications.
This study theoretically... -
Astghik Margaryan (Junior researcher)17/06/2025, 16:35
In this work, the Fraunhofer diffraction of a plane electromagnetic wave obliquely incident from a homogeneous, isotropic, and non-gyrotropic medium onto a slit is theoretically examined. Behind the slit, there is a similar medium that differs in its optical parameters from the medium from which the electromagnetic wave is incident. The refractive indices of both media are arbitrary .
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Zara MKrtchyan17/06/2025, 16:36
In the application, transformation, and commercialization of radiation technologies across disciplines such as archaeology, medical physics, environmental science, functional materials, and crystallography, 5 or 6 stage models are commonly employed to ensure both effective and safe utilization. In medical contexts, more extensive 6 to 7 stage models are often employed to facilitate secure...
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Arthur Margaryan17/06/2025, 16:37
Development of new acoustophysical methods for deposition of thin films
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Abrahamyan A.S., Chilingaryan R.Yu., Hovhannisyan H.T., Margaryan A.A., Sahakyan K.G., Sargsyan M.H., Mkrtchyan A.H.
Institute of Applied Problem of Physics of the National Academy of Sciences of Armenia
IAPP NAS RA. 25 Nersisyan St., Yerevan 0014
This article presents the results of a study on the development of a... -
Hrachya Sargsyan17/06/2025, 16:38
The accidents at Chernobyl NPP (April 26, 1986) andFukushima-1 NPP (March 11, 2011) demonstrated have highlighted the pressing challenges in radiation biophysics, including the early diagnostics of radiation injury, assessment of its severity, outcome prediction of radiation sickness, and the development of methods for assessing the effectiveness of therapeutic agents and treatment...
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Hrachya Sargsyan17/06/2025, 16:39
Numerous studies on the changes in physicochemical and structural properties of erythrocyte membranes following radiation exposure indicate that erythrocytes which do not undergo death or destruction in the early post-radiation period may still undergo alterations in both shape and size. In recent years, alongside experimental research, studies on numerical modeling of diffusion transport...
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Hasmik Panyan (Hydrometeorology and Monitoring Center (State Non-Commercial Orgnization), Ministry of Environment (MoE), ARmenia), Zara Mkrtchyan (1. Institute of Applied Problems of Physics, National Academy of Sciences (NAS), Armenia; 2. International Scientific Educational Center (ISEC), NAS, Armenia)17/06/2025, 16:40
Radiation Technologies in Environmental Science have demonstrated diverse developmental directions. This study focuses on and examines outcomes that have led to advanced technological solutions. The use of ionizing and non-ionizing radiation to monitor, treat, or analyze environmental components, nowaday, is extremely important. These methods are often non-invasive and highly...
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Arkadi Soghomonyan (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia)17/06/2025, 16:41
This paper presents the results of an experimental study on the effect of a temperature gradient on the characteristics of asymmetric X-ray reflection in quartz single crystals (X-cut) in the Laue geometry.
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The presence of a temperature gradient induces bending of the atomic planes and a change in the interplanar spacing across the thickness of the crystal, which in turn affects the... -
Stepan Petrosyan17/06/2025, 16:42
The paper considers a functional scheme, which introduces new solutions aimed at improving the accuracy of the laser rangefinder.
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For this purpose, an adjustable optical delay line is introduced between the modulator-demodulator and the receiving and transmitting optical system, connected by the output to the measuring unit and the input to the integrator, as well as a rotating transparent... -
Vardan Harutyunyan17/06/2025, 16:43
Various detector concepts based on gallium arsenide have been developed and characterized for hard X-ray applications. Recently, a 3D imager with capacitively coupled GaAs based avalanche photodiode and cross-delay lines (APCDL) was reported for hard X-ray photon detection [1]. This hybrid system is a promising imager offering temporal and spatial resolutions less than tens of picoseconds and...
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Liana Bezhanova (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia)17/06/2025, 16:44
As a development of the previous investigation on a specific intermolecular interaction in nematic liquid crystal (NLC) systems, new results of the experimental studies of the dielectric permittivity in NLCs based on biphenyls in the LC state and during the LC → IL phase transition are discussed in this work. Dielectric measurements were carried out on a frequency range from 10 to 〖10〗^4 Hz...
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Ruzan Sukiasyan (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia)17/06/2025, 16:45
The subject of the present study is nonlinear optical (NLO) crystals: L-nitroarginine perchlorate (L-NNA·HClO4) (I) and L-nitroarginine tetrafluoroborate (L-NNA·HBF4) (II). The crystal and molecular structure of (I) and (II) crystals were determined by the single crystal X-ray diffraction method at 120K. These crystallize in the monoclinic system with space group P21 and Z=2. Unit cell...
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Abraham Mahtessian17/06/2025, 16:46
We show that the parameters used to standardize the luminosity of Type 1a supernovae in the SALT2 and SiFTO models depend strongly on the redshift z. Consequently, when standardized with increasing z, the average absolute magnitudes of Type 1a supernovae are artificially increased. This means that for a given apparent magnitude they are, on average, assigned larger distances than they actually...
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Mikayel Ivanyan17/06/2025, 16:47
Cylindrical waveguides with a two-layer metal-dielectric wall are widely used in experimental work on splitting beams of charged particles and in designing slow-wave devices. The manufacture of a sufficiently long section of a two-layer (usually copper-dielectric) waveguide is associated with significant technical and financial difficulties. Meanwhile, as shown in the article, many of the...
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Laya Anjo17/06/2025, 16:48
Gallium Nitride (GaN) thin films were deposited on p-type Si (100) substrates using a plasma focus (PF) device, with a view to probing the effect of plasma shot number and post-deposition annealing on their optical and structural properties. The 2, 4, and 6 PF shot exposed films were processed and systematically characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy...
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Mikhail Shevelev17/06/2025, 16:49
Three-dimensional printing is currently widely used for producing various microwave components, including radiation focusing. Therefore, additive technologies with subsequent metallization were chosen for the manufacture of large aperture parabolic mirrors. These mirrors can be used firstly in a scheme to detect the angular and orientation dependencies of transition radiation and other types...
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Mikhail Shevelev17/06/2025, 16:50
In the framework of classical electrodynamics, polarization radiation (PR) is created by a uniformly moving charge within or near a medium. In this scenario, sources of radiation are time-varying currents induced in the medium by the electromagnetic field of a charge. Several types of PR exist, including Cherenkov radiation, transition radiation, Smith-Purcell radiation, and parametric x-ray...
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Yury Cherepennikov17/06/2025, 16:51
In recent years, neutron capture therapy (NCT) has transitioned from utilizing reactor neutron sources for research to employing accelerator-driven neutron sources for practical applications, thanks to advancements in accelerator technology. Pulsed accelerators have emerged as a viable option for neutron sources in NCT due to their compact design and cost-effectiveness. When creating...
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Yury Cherepennikov17/06/2025, 16:52
3D-printing technologies are increasingly employed across a wide range of applications, including medical imaging. Their current capabilities enable the rapid and cost-effective fabrication of complex geometries, making them well-suited for developing custom imaging phantoms. Recent studies have demonstrated the feasibility of producing image quality test phantoms for planar X-ray imaging...
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Mikhail Shevelev17/06/2025, 16:53
Cherenkov radiation is well-known effect in soft-x-ray range and can be used for organic and inorganic research. To realize such radiation source there is the need to detail study and develop new methods for radiation estimation and optimization. In this report, we demonstrate the simple theoretical model of Cherenkov x-rays produced by a charge passing through a multilayer target for a given...
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Robert Mirzoyan (Institute of Applied Problems of Physics NAS RA)17/06/2025, 16:54
The peculiarities of X-ray diffraction from atomic planes of the same family in different cuts of quartz single crystals under the temperature gradient are investigated. Quartz single crystals have the form of rectangular parallelepiped plates with X- and Z-cuts, one edge of which (heated) was oriented parallel to the reflecting planes (101̅0). The experiments were carried out using collimated...
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Artur Azizov (CANDLE)17/06/2025, 16:55
The paper presents a new method of metal-ceramic brazing that provides high-quality connections. A technology has been developed for tubular metal-ceramic connections, and a device has been created to create pressure on the connecting parts due to the difference in thermal expansion coefficients. The temperature deformation has been determined by calculation.
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Despite the fact that various... -
Karapet Trouni (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia)17/06/2025, 16:56
A single crystal X-ray diffraction method has been developed to determine the hard X-ray spectrum with high resolution. The design and performance of the wavelength-dispersive spectrometer are based on diffraction by bent crystals in Laue geometry. It is shown that in this case we lose intensity, but have approximately twice the wavelength-dispersion as in the von Hamos geometry. The...
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Hayk Harutyunyan17/06/2025, 16:57
The results of Geant4 simulations of the spectral and angular distributions of the radiation generated by a charged particle crossing a cylindrical target are presented. Previously, experimental studies of the spectral angular distribution of coherent Cherenkov radiation in the sub-terahertz frequency range from a cylindrical Teflon resonator generated by an electron beam with an energy of 3.6...
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Ashot Khachatrian (National Polytechnic University of Armenia, 105 Teryan Street, Yerevan 0009, Armenia)17/06/2025, 16:58
The Reciprocity of Illumination and Observation Points in Diffraction Patterns with Maxima
A.Zh. Khachatrian, G.P. Vardanyan, O.A. Zadoyan
National Polytechnic University of Armenia, 105 Teryan St., Yerevan 0009, ArmeniaThis paper examines the problem of identifying structural features of molecular formations or structures based on diffraction patterns produced by their...
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Abdelmoneim Sulieman (College of Applied Medical Sciences)17/06/2025, 16:59
Purpose: This study aims to evaluate the effectiveness of various shielding configurations in attenuating proton radiation and secondary particles, using Monte Carlo simulations. The focus is on comparing single-layer concrete shields with multilayer combinations involving concrete, iron (Fe), and polyethylene (PE).
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Methods: Monte Carlo simulations were performed using the PHITS code to model... -
Abdelmoneim Sulieman (King Saud University for Health Sciences,)17/06/2025, 17:00
Regression models and artificial neural networks (ANNs) are among the most commonly employed techniques for predicting the dynamics of natural and industrial phenomena [1]. In eastern Sudan, radioactivity levels in areas affected by gold mining and other industrial activities were forecast using multiple regression and artificial neural networks. We developed multiregression and ANN models...
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Nissren Tamam (King Saud Bin Abdulaziz University for Health Sciences)17/06/2025, 17:01
Purpose: In proton therapy, secondary particles such as neutrons and gamma rays are unavoidably produced through nuclear interactions, potentially contributing to out-of-field dose and biological risk. This study aims to evaluate the energy spectra and dose contribution of secondary neutrons and gamma rays generated within a water phantom during proton irradiation using detailed Monte Carlo...
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Mohammed Alkhorayef (King Saud University)17/06/2025, 17:02
nuclear medicine departments in Saudi Arabia over six years. Optically stimulated luminescence (OSL) dosimeters(AL2O3:C) (Nagase Lindauer, LTD (Japan)), was used to quantify the annual effective doses (Hp (10)) for A cohort of 16 workers including nurses (n=3, 18.75%), physicians (n=1, 6.25%), medical physicists (n=3, 18.75%), and technologists (n=9, 56.25%).The overall mean ± SD effective...
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Armen Sedrakyan (National Polytechnic University of Armenia (NPUA))17/06/2025, 17:03
The probabilistic appearance of the dependence of the breakdown voltage (electrical strength) of a dielectric located between the circles of a capacitor on the thickness in homogeneous and inhomogeneous fields for dielectric layers in the range from 0.1 mm to atomic thickness is considered. The results of already known experiments and an analytical view of the probability density of their...
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Astghik Danghyan17/06/2025, 17:04
In this study, the effect of doping the amino acids L-Alanine (L-Ala) and Glycine (Gly) on α-LiIO3 single crystal were presented. Previously have reported by us on improving the properties of α-LiIO3 crystal doped with L-arginine (L-Arg) and L-nitroarginine (L-NNA) [1]. Bulk crystals were grown both from solutions doped with different quantities (3 mol/% and 5 mol/%) of L-Ala and Gly and from...
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Fahad Alothaim (The Saudi Food and Drug Authority SFDA - Riyadh, KSA)17/06/2025, 17:05
Abdulaziz Alsugair2, Nasser Alaboudi1, Fahad Alothaim1*, Abdulrahman Almutairi5, Abdulaziz Almosabahi3, Abdullah Aldosari3, Sarah Albahiti4, Yusuf Alkadhi2, Belal Moftah2, Mohammed Alshabanah2, Saad Aldelaijan2, Noor Alnaimy5, Maryam Alhashem5, Abdulrahman Alkhalifa6, Abdulrahman Algeer7, Ayman Alkhadra8, Ahmed Alomrani9, Mohammed Alkhorayef10, Mohammad Ghrawi1, Abdulmajeed Almansour1,...
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Harutyun Vasilyan (A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute))17/06/2025, 17:06
H. V. Vasilyan*, H. I. Badalyan, T. V. Ohanyan, S. J. Sedrakyan, E. Aleksanyan, N. B. Margaryan
A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 2 Alikhanyan Brothers, Yerevan, Republic of Armenia, 0036
Graphene was synthesized via an efficient, low-temperature liquid-phase exfoliation technique and then characterized using a suite of analytical methods. Raman...
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Tigran Ohanyan (A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute))17/06/2025, 17:07
T.V. Ohanyan*, H.I. Badalyan, H.V. Vasilyan, S.J. Sedrakyan, E. Aleksanyan, N.B. Margaryan
A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 2 Alikhanyan Brothers, Yerevan, Republic of Armenia, 0036
Graphene’s outstanding physical characteristics—most notably its ultralight weight—make it an ideal candidate for space based technologies. Yet, the effects of proton...
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Vardan Margaryan (Institute of Applied Problems of Physics NAS RA)17/06/2025, 17:08
The paper proposes a new method for visualizing phase-contrast images of polymeric substances using an X-ray interferometer, which makes it possible to determine some of their properties. In particular, based on a three-crystal (two-beam) interferometer, the refractive index and density of polymers were determined by analyzing changes in interference (moiré) patterns. A special device (phase...
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Ani Avetisyan (Yerevan State University, Insitute of phisics)17/06/2025, 17:09
The possible mechanisms of the influence of ionizing radiation (IR) on the structure and properties of the phospholipid bilayer were studied by computer simulation, optical polarization microscopy, and X-ray diffraction simultaneously at large and small angles. Three mechanisms of the influence of IR on model membranes obtained in an aqueous medium of an amphiphilic substance have of different...
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Nelli Gharibyan (Institute of Applied Problems of Physics)17/06/2025, 17:10
The subjects of the present study are L-arginine sulfates (LAS∙2H2O & LAS) and L-nitroarginine sulfosalicylate (L-NNA∙SSA). The thermal properties, vibrational spectra, UV-Vis transmittance spectrum and second harmonic generation activity were experimental studied. The crystal and molecular structure of crystals were determined by the single-crystal X-ray diffraction method. The optimized...
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43. Optimization of Calibration Factors and Recovery Coefficients for Lu-177 SPECT/CT Using PhantomsMohammed Alkhorayef (King Saud University)17/06/2025, 17:11
Accurate quantification of Lu-177 uptake in radionuclide therapy requires precise calibration of SPECT/CT systems. This study aimed to determine calibration factors (CF) and recovery coefficients (RC) using Jaszczak and NEMA Image Quality phantoms under standardized acquisition and reconstruction protocols. Lu-177 SPECT/CT was performed with a dual-energy window protocol: main photopeak (208...
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Samvel Mkhitaryan (Institute of Applied Problems of Physics NAS RA)17/06/2025, 17:12
In this paper, the results of the studies of fine structures of X-ray diffraction patterns formed in the X-ray 3-block defocused (violated ideal geometry) interferometers, as well as a new method to record these structures, are presented. To implement this method, a monolithic 4-block X-ray diffraction system is proposed and successfully applied, in which the first 3 blocks are thin and set up...
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Mohammed Albogami (Alnakheel Medical Center)17/06/2025, 17:13
Computed tomography (CT) is a vital diagnostic tool in pediatric medicine, but its associated ionizing radiation raises concerns about long-term cancer risks. Children are particularly vulnerable due to their rapidly dividing cells and longer life expectancy for radiation-induced effects to manifest. Epidemiological studies, including extensive cohort analyses, suggest a small but...
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Tiruhi Bakhshiyan (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia IAPP NAS RA)17/06/2025, 17:14
T.M. Bakhshiyan1,2*, G.H. Hovhannisyan2
1Institute of Applied Problems of Physics
of the National Academy of Sciences of the Republic of Armenia,
25 Hrachya Nersisyan, Yerevan, Armenia, 0014
2Yerevan State University, 1 Alex Manoogian Str., Yerevan, Republic of Armenia, 0025Given the growing prospects for the widespread use of isotopes in nuclear medicine, such as in SPECT/CT and...
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Arevik Arestakyan17/06/2025, 17:15
A. Arestakyan1*, E. Aleksanyan1, V. Harutyunyan1, A. Badalyan1,2,
N. Grigoryan1, A. Papikyan1, H. Yeritsyan1, A. Martirosyan11 A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute),
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2 Alikhanyan Brothers, Yerevan, Republic of Armenia, 0036
2 Institute of Applied Problems of Physics
of the National Academy of Sciences of the Republic of Armenia,
25 Hrachya... -
David Bradley (University of Surrey and Sunway University)18/06/2025, 09:00
Present work continues research into the viability of commercially available small dimension carbonaceous media for ionizing radiation dosimetry and radiation damage studies, in part examining the relationship between structural alterations, surface-area-to-volume ratio and carbon content. Dose dependency characterizations have been undertaken for rods and sheets for a range of sources,...
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Leonid Goray (Alferov University)18/06/2025, 09:40
There are two principal ways to achieve ultra-high spectral resolution and maximal diffraction efficiency by blazed (with triangular groove profiles) gratings in the short-wave range (from hard X-rays to vacuum UV): (1) using high-orders diffraction with low and medium groove densities; (2) using first-orders diffraction with high and ultra-high groove densities. Due to the hard-to-solve...
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Levon Grigoryan (Institute of Applied Problems of Physics NAS RA)18/06/2025, 10:20
The relaxation of the polarization of the medium as a result of interaction with charged particles leads to the formation of various types of radiation processes. Examples that have been studied in detail in the literature include Cherenkov radiation (CR), transition radiation, and diffraction radiation. The radiation processes mentioned above are also sources of electromagnetic radiation...
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Danilo Giulietti18/06/2025, 11:00
When the Chirped Pulse Amplification allowed to amplify ultrashort laser pulses, generated in mode-locking mode, it became possible to use the intense electric fields of the plasma electron waves to accelerate electrons up to a few GeV on centimeter scale. The physical mechanisms on which is based this innovative acceleration and the related applications will be presented.
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Lucia Giuliano18/06/2025, 12:00
FLASH radiotherapy is an emerging and highly promising technique in cancer treatment that delivers ultra-high dose rate radiation in extremely short pulses—typically within milliseconds.
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This novel mode of dose delivery triggers the so-called FLASH effect, which has demonstrated the remarkable ability to spare healthy tissues while maintaining effective tumor control, potentially... -
Ashot Gevorkyan (Institute for Informatics and Automation Problems NAS of Armenia/ Institute of Chemical Physics NAS of Armenia)18/06/2025, 12:40
In the work within the framework of the gauge symmetry group SU(2)xU(1) the Yang-Mills equation for a single photon is considered. Using the equations in partial derivatives of the first order, an equation for the wave function of the photon is obtained in the form of an equation of the second order taking into account the random environment. The problem of the motion of a single photon in a...
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Mikayel Ivanyan18/06/2025, 13:00
When a charged point particle moves parallel to the axis of a two-layer cylindrical metal-dielectric waveguide with a sufficiently small thickness of the internal dielectric coating, its radiation field has a single-mode character, i.e., the frequency distributions of both the longitudinal and transverse impedances of the waveguide contain a single, clearly expressed narrow-band resonance....
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Sergey Arsentev (A.B. Nalbandyan Institute of Chemical Physics of the National Academy of Sciences of the Republic of Armenia)18/06/2025, 13:20
One of the methods of influencing chemical reactions is the use of ultrasound. In this case, most chemical reactions in ultrasonic fields occur in aqueous solutions in the presence of cavitation. It is known that under the influence of cavitation, the direction and speed of chemical reactions occurring in a solution can change significantly. In a number of cases, processes may occur that are...
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Vahram Ghazaryan19/06/2025, 15:00
Polyiodides have emerged as compounds of interest both for their practical application and in the context of supramolecular chemistry. In the synthesis of halogenometallates the incorporation of polyiodide anions leads to an increase of absorption in the visible region and helps to achieve a narrower bandgap which was additional motivation to investigate polyiodides independently. We have...
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Gayane Tonoyan19/06/2025, 15:20
Halide organic-inorganic materials were classified as attractive semiconducting materials [1]. Such hybrid materials with amino acids are proposed for this aim [2]. Among these, halogenostannates demonstrated an unprecedented level of tunability in bandgaps across the entire visible spectrum [3]. We hereby present seven new halogenostannates with amino acids glycine (Gly), sarcosine (Sar),...
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Laya Anjo19/06/2025, 15:40
Additive manufacturing (AM) waste high in copper was employed as an eco-friendly precursor in this study for the formation of luminescent copper-containing nanomaterials. The sonochemical process using a bath-type ultrasonic reactor (40 minutes, 99% power) was applied to convert 3D-printing metallic waste into nanostructures based on oxides using acoustic cavitation. Three different additive...
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Hovhannes Badalyan (A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 2 Alikhanyan Brothers, Yerevan, Armenia, 0036)19/06/2025, 16:00
Graphene, a two-dimensional material composed of a single layer of carbon atoms in a honeycomb lattice, has garnered immense interest for its exceptional mechanical strength, electrical conductivity, and thermal transport properties [1, 2]. In this work, we introduce a novel chlorination protocol—using a specialized liquid-phase treatment—to covalently attach chlorine atoms to graphene, and...
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Aram Davtyan (Nalbandyan Institute of Chemical Physics of the NAS RA)19/06/2025, 16:20
The introduction of ultrasonic vibrations into aqueous solutions can, under certain conditions, lead to the emergence of cavitation, which is expressed in the emergence and collapse of vapor-gas bubbles. In this case, the relatively low average energy of ultrasonic vibrations is concentrated in a small volume of vapor-gas bubbles, reaching high values. As a result, high temperatures (on the...
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Mikhail Shevelev19/06/2025, 17:00
Optical beam diagnostics based on transition radiation (TR) is widely used to measure both transverse and longitudinal bunch sizes. However, in installations based on modern acceleration techniques (laser-plasma, etc.), the intensity of the resulting beam may be insufficient for TR diagnostics. The application of alternative, more intense radiation mechanisms will improve the accuracy of...
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Sonya Khosrovyan (IAPP NAS RA)19/06/2025, 17:20
The results of an experimental study of the spectral distribution of coherent Cherenkov radiation from a pair of electron bunches at the AREAL Accelerator are presented. As a target, a cylindrical Teflon resonator is used. Coherent effects were studied depending on the distance between the bunches, which varied from 2 to 11 ps. Radiation was recorded using QOD (Broadband Quasi- Optical...
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Gayane Margaryan19/06/2025, 17:40
The results of theoretical and Geant4 simulations studies of the spectral and angular distributions of the radiation generated by a charged particle crossing a dielectric ball, inserting in vacuum, are presented. Previously, for non dispersive dielectric ball it was shown that for certain values of the problem parameters the radiation can exhibit a resonant character in narrow frequency...
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Gor Chalyan (Yerevan State University)19/06/2025, 18:00
We investigate the radiation emitted by a circular annular electron beam propagating parallel to the axis of a dielectric cylinder embedded in a homogeneous medium. Expressions are provided for the potentials and the strengths of the electric and magnetic fields inside and outside the cylinder, considering a general dispersion relation for the two media. The energy flux through the plane...
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Hovhannisyan Vahe (https://indico.cern.ch/event/1525866/abstracts/)19/06/2025, 18:20
The identifications of radio sources with angular sizes greater than 20' with quasars are not definite. Quasars cannot be radio sources with such large dimensions. They are very compact not only in the optical domain but also in the radio domain. The reason these radio sources are identified with quasars is due to the presence of a compact radio source within the extended radio source, which...
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Sergey Nazaretyan20/06/2025, 09:10
S.N. Nazaretyan 1*, L. Mirzoyan 2
1 Territorial Survey for Seismic Protection of MIA Armenia,
8/1, Tsiternakaberd highwey Yerevan, Republic of Armenia, 00822 Yerevan State University, 1 Alex Manoogian Str., Yerevan, Republic of Armenia, 0025
The 1988 Spitak earthquake (epicenter: φ = 40,90; λ = 44.20, M = 7.0, depth - 10 km, main shock duration - 35-45 sec) is one of the most...
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Hassan Salah (Inaya Medical College)20/06/2025, 09:30
Abstract
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This study assesses radiation doses from the CT component of SPECT/CT scans used in lymphoscintigraphy procedures at a single institution. Data from 130 patients were analyzed, focusing on CT dose metrics, including CTDIvol, SSDE, and DLP, alongside technical parameters such as tube current, collimation, and pitch. Results showed an average CTDIvol of 2.07 ± 1.25 mGy (range:... -
Yury Cherepennikov20/06/2025, 09:50
The study of Urartian metallurgy remains a significant topic in the investigation of metal production in the Ancient Near East during the first half of the first millennium BC. Excavations conducted between 2014 and 2016 at the newly discovered necropolis of Teishebaini (Karmir Blur), a city of the Kingdom of Urartu, uncovered over 250 burials, yielding several hundred metal artefacts. The...
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Tiruhi Bakhshiyan (Institute of Applied Problems of Physics of the National Academy of Sciences of the Republic of Armenia IAPP NAS RA)20/06/2025, 10:10
Antimony-124 (¹²⁴Sb) is a promising radionuclide for medical applications, particularly in low-dose rate intravascular brachytherapy (IVBT), due to its unique nuclear characteristics. High-energy β-particles (1-2 MeV and higher) are effective for local tumor or restenosis treatment. Low-energy γ-rays (20–300 keV) are suitable for imaging, dosimetry, and monitoring the treatment process without...
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Andranik Manukyan (A. Alikhanyan National Science Laboratory)20/06/2025, 10:30
Isotopes research and production department at A. Alikhanyan National Science Laboratory (AANL) develops production technologies for Ga, Cu, and Tc radiometals for medical applications [1-4]. The technology is based on solid target irradiation under an 18 MeV proton beam of an IBA C18 cyclotron. The solid target production method leads to higher activity of the final product than the liquid...
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Sargis Hunanyan (Alikhanyan National Scientific Laboratory)20/06/2025, 10:50
Ionizing radiation (X-rays, proton beams) causes structural changes in materials. If a vibrating metallic wire is subjected to such radiation, the natural frequency of the wire is affected as a result of changes in the elastic characteristics of the material. This paper presents the results of experiments on the impact of X-ray radiation in the range of 100-165 keV and a proton beam with...
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Vardan Margaryan (Institute of Applied Problems of Physics NAS RA)20/06/2025, 11:30
An experimental investigation of double-slit dynamic X-ray diffraction in silicon crystals demonstrates that Young’s interference fringes can be formed in the cross section of the reflected beam, depending on the distances between the monochromator and the slits, as well as between the slits themselves. The study reveals that the number of observable fringes is influenced by both the crystal...
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99. X-ray Diffraction Study of Deformation Fields Induced by Temperature Gradient in Single CrystalsTigran Dovlatyan20/06/2025, 11:50
As is known, the correct choice of the deviation function is very important in order to obtain a certain intensity, spectral and spatial distribution in the diffracted beams formed as a result of X-ray diffraction in deformed crystals. To describe the deviation function, it is sufficient to provide the dependence of the bending radius and interplanar distances of the reflecting atomic planes...
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Nikita Alekseev (National Research Tomsk Polytechnic University)20/06/2025, 12:10
Preclinical positron emission tomography (PET) requires high spatial resolution of the detector. A monolithic scintillator detector block is one of the promising approaches due to its ability to estimate the depth of interaction (DOI) and improve resolution through processing multiple channels and analyzing light distribution. The typical construction of such a block is a matrix of silicon...
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Babken Semerjyan (Yerevan State University, Institute of Physics)20/06/2025, 12:30
Semiconductor nuclear radiation detectors are mostly high-resistance. In order to use very high-resistance detectors, we propose an interface for working with them. We propose a metal-oxide-semiconductor (MOS) structure as a signal-modulating device. The modulation of the MOS capacitance occurs by modulating illumination through an optically translucent metal contact.
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Vitali Khachatryan20/06/2025, 12:50
In recent years, material irradiation processing experiments have gained significant interest due to their vital role in various fields such as life sciences, material science, and electronics. Accurate and efficient determination of absorbed dose distribution is crucial for optimizing these processes. This study investigates the combination of glass plate irradiation and digital processing of...
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Abdelmoneim Sulieman (King Saud bin Abdulaziz University for Health Sciences)20/06/2025, 15:00
High-Resolution Computed Tomography (HRCT) is widely employed in the diagnosis of lung diseases, demonstrating a sensitivity of 95% and a specificity of 85%. Chest CT is frequently used for the diagnosis and monitoring of disease progression, outcomes, and treatment effectiveness. CT is associated with radiogenic risks, which refer to the potential risk of developing cancer due to exposure to...
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Lusine Aloyan (Yerevan State University)20/06/2025, 15:20
This study examines the effects of X-ray radiation on DNA and platinated DNA complexes in the presence of AgTOEPyP4 porphyrin. We investigated varying relative concentrations of porphyrin-DNA complexes (r = 0.01, 0.02, 0.04, where r = Cporf/CDNA) and conducted a comparative analysis with platinated DNA complexes (r = 0.025, where r = cis-Pt/CDNA) at a radiation dose of 2 Gy. This approach...
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Farhad Moradi (Multimedia University, Cyberjaya, Malaysia)20/06/2025, 15:40
Area monitoring, including environmental and workplace radiation surveillance, is essential in settings with significant radiation exposure such as nuclear reactors, accelerator facilities, contaminated waste sites, and NORM-affected zones in the oil and gas industry. Photon energies in these environments typically range from 20–30 keV to several MeV, requiring dosimetry systems whose response...
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Ali Mahdipour (Bojnurd Student Research Institute)20/06/2025, 16:00
S. A. Mahdipour1, M. Shafeei Sarvestani1, S. B. Dabagov2, A. Mowlavi3
1Department of Physics, Bojnurd Student Research Institute, Iran
2INFN Laboratory Nazionali di Frascati, RAS P.N. Lebedev Physical Institute, NR Nuclear University MePhI
3Department of Physics, Hakim Sabzevari University, Sabzevar, IranRadiation Pressure Acceleration (RPA) and Target Normal Sheath Acceleration...
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Anush Badalyan (A. I. Alikhanyan national science laboratory (Yerevan Physics Institute)" foundation)20/06/2025, 16:40
Enhanced thermal barrier coatings (TBCs) have the potential to facilitate the operation of next-generation gas turbines at increased combustion temperatures. Considerable research efforts are currently focused on the development of novel materials that surpass the performance of conventional industry standards. Beyond their use in turbines, TBCs are also being investigated for aerospace...
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Anastasiia Stakhova (Shevchenko Kyiv National University of Kyiv)20/06/2025, 17:00
N.V. Maksyuta, V.I. Vysotskii, A.O. Stakhova, D.N. Maksyuta
Faculty of Radio Physics, Electronics and Computer Systems Taras Shevchenko Kyiv National University of Kyiv, Glushkova ave., 4g
This paper continues the study of the features of spectral distributions of spontaneous radiation arising from the channeling of relativistic (including weakly relativistic) electrons in complex...
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Manvel Manvelyan (Institute of Applied Problems of Physics NAS RA)20/06/2025, 17:20
In this paper the hydrogen-like donor impurity states in CdSe nanoplatelet have been studied using the approximation and numerical methods. The impact of polarization effects caused by a significant mismatch of dielectric constants between the nanoplatelet and the surrounding medium is considered within the framework of the Ritova-Keldysh theory and the Takagahara model. The interaction...
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Aram Nahapetyan (Institute of Applied Problems of Physics)20/06/2025, 17:40
The intraband optical transitions in the strongly oblate asymmetric ellipsoidal GeSi quantum dot (QD) containing pair-interacting heavy hole gas have been investigated. It has been shown, that due to QD specific geometry, the hole gas localization in the lateral plane XOY is described in the framework of the two-dimensional asymmetric oscillator model. Based on the obtained results, Kohn's...
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Mane Harutyunyan20/06/2025, 18:00
Liquid crystal elastomers (LCEs) are a special class of materials that combine the flexibility of elastomers with the ordered structure of liquid crystals. These materials have polymer chains that are linked to liquid crystal molecules, which align in specific directions, creating a unique combination of properties. LCEs can stretch and bend like elastomers, but they also respond to external...
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Petr Alexandrov (Kurchatov Institute)
P.A. Alexandrov, A.V. Beklemisheva, I.F. Sotnikov, V.A. Kirsh
Research Center "Kurchatov Institute", 1 Kurchatov Square, Moscow
It is supposed to heat the Lunar soil with water vapor, which is obtained
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by contact heating of the soil. According to published data, water in the form of ice makes up from 5% to 30% of the lunar soil by mass. The soil in cold traps is at a temperature of –...
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