Abstract. We compare complex potential and Lagrangian approaches to perturbed soliton evolution in systems described by the nonlinear Schrödinger equation with various terms added to it. The physical effects induced by quite a number of factors can easily be ascertained. While the approaches mostly give similar relations, there are some differences between the results found.

Abstract. In this paper, by introducing appropriate rational and logarithmic transformations, the two components Maccari system in (2+1)-dimensions is transfered into bilinear form. Then the N-soliton decomposition algorithm and the inheritance solution strategy proposed by us are extended to construct the higher-order interaction solutions among solitons, periodic waves, and rational waves for such type equation.

Abstract. Building coherent states for the family of orthogonal polynomials (including Meixner polynomials) has advanced in recent years. Although coherent states were formulated for Meixner polynomials, many properties remained unexamined, compared the usual coherent states. This paper aims to partially fill this gap, by examining statistical properties of both pure and mixed (thermal) coherent states. We examined the values of Mandel's parameter and reveal the connection between the coherent states of the Meixner and the pseudoharmonic oscillators. Particularly, we use where needed the formalism of the normal ordering of the operators products.

Abstract. The purpose of this research is to use an intriguing variant of the Adomian decomposition method to resolve an initial-value problem for the general dispersive fractional partial differential equation. By combining the Adomian decomposition method with a stunning recurrence formula and using the solutions of the well established generalized Abel equation, a novel recursive strategy is developed. It has been demonstrated that our approach may be advantageous for computing the components v_n, n= 1,2, ... in a formula that is easily computed.

Abstract. In this study, we evaluate the feasibility of using quantum neural networks for classifying gravitational waveforms, using both simulators and quantum computers. The analysis is quite interdisciplinary in its nature, combining knowledge involving astrophysics, quantum information as well as quantum and classical machine learning. We showed that the quantum classifiers and hybrid classical-quantum layers give highly accurate results when tested on a simple dataset and ran on a simulator; also, adding a quantum layer to poorly performing classical neural network can highly improve its accuracy. When running on a real quantum computer, error minimizing algorithms need to be implemented in order to obtain a satisfying accuracy.

Abstract. The shell rate theory and phenomenological models are applied to predict the α halflives for ^289-298Og isotopes. Calculation of spontaneous fission (SF) halflives is performed with an empirical model. The competition between α-decay and SF at shell closures is investigated in detail and the most probable decay modes of these isotopes are predicted.

Abstract. Over the last decade, radio detection of extensive air showers has matured from small prototype arrays, like LOPES [1, 2], to large-scale cosmic-ray experiments, like the Pierre Auger Observatory [3]. The technique relies on the measurement of coherent radio emission dominantly arising from secondary charge particles deflected in the Earth's magnetic field, with secondary radiation arising from negative charge excess present in air showers [4]. In contrast to vertical air showers (with zenith angles below 60 degrees), the inclined ones illuminate large ground areas of several km², with radio signals detectable in the 30 to 80 MHz frequency band. Since the area illuminated by radio signals grows with the shower's zenith angle, the radio detector needs to cover large arrays, as it is the case of AugerPrime, i.e. Auger Upgrade, which facilitates the installation of radio antennas on top of each surface particle detector, covering thus the entire Auger experiment array of 3000 km² with complementary detector components (water tanks, scintillators, radio stations) of full duty cycle each, placed at the same location. This is particularly of interest for the radio detection at large-scale on energy estimation of cosmic rays [5], and observation of inclined air showers [6]. In this paper we look at the response of a toy-model hexagonal detector [7], by using a sample of CoREAS simulations [8, 9] of 64 events for proton as primary particle, at two energies (10¹⁸ and 10¹⁹ eV), and with several developing shower geometries by given zenith (from 10 to 80 degrees, in steps of 10) and respectively azimuth angles (from 0 to 315 degrees, in steps of 45). This study comes in support to the world's largest cosmic ray experiment, the Pierre Auger Observatory, which currently is in the upgrade phase, aiming to improve its detectors and consequently rise statistics of measured ultra high energy cosmic ray events, in order to elucidate mysteries of the most energetic cosmic rays in the Universe.

Abstract. The nonlinear surface waves propagating along a layered waveguide structure containing a linearly graded-index medium and Kerr nonlinear medium separated by optically linear slab are described theoretically. A model of such waveguide and the wave equation with composite dielectric constant depending on the spatial distance and light intensity in the corresponding layers are formulated. The exact solutions to the wave equation describing new types of surface waves are calculated. The four types of the waves obtained differ from each other by the presence of oscillations of the field profile transverse to the layers and a nonlinearity sign. Dependencies of the interface amplitude on the effective refractive index, slab width, and width of the graded-index layer are analyzed.

Abstract. Polycrystalline LiInO₂ was synthesized by the solid-state method and was characterized using combined experimental and computational methods. The results of experimental measurements were compared with the computational analysis of lattice vibrations based on DFT calculations. A good agreement between experimental and theoretical frequencies of LiInO₂ structure vibration mode was obtained.

Abstract. The antimicrobial potential of some polyphenolic compounds: apigenin, baicalin, daidzein, genistein, luteolin, and resveratrol (a non-flavonoid compound) against membrane TolC protein in the bacterium Escherichia coli was monitored in silico by investigating the pharmacological properties, bioactivity, and oral toxicity of these compounds. The molecular docking of the polyphenolic compounds (excepting baicalin that do not respect RO5 rule) towards TolC protein revealed that many of these compounds bind to TolC protein with a moderate affinity, only genistein and luteolin showing high binding energies and, consequently, high affinity constants.

Abstract. Inductively coupled plasma mass spectrometry (ICP-MS) was used to provide precise information on the fundamental elemental compositions of phosphate rocks from the El-Sibayia and El-Hamrawein mines in Egypt. To create an elemental fingerprint for the two locations under examination, twenty-five elements were determined (U, Th, Eu, Hf, La, Lu, Sm, Tb, Yb, Ce, Dy, Er, Nd, Pr, Tm, Zn, Cu, Pb, Ni, Co, Cd, Sc, Ag, Li, and Mo). The concentrations of radioelements (uranium, thorium), rare earth elements (REEs), and other trace elements and heavy metals in the phosphate samples under inquiry were compared to those found in other published work. The X-ray fluorescence method (XRF) was used to identify the various oxides found in phosphate rocks: SiO₂, Al₂O₃, CaO, Fe₂O₃, MgO, Na₂O, K₂O, Cr₂O₃, TiO₂, P₂O₅, MnO, SrO and BaO. The data will be used to create a baseline level for these elements in phosphate rocks, as well as to assess the agronomic viability of the phosphate extracted from the El-Sibayia and El-Hamrawein mines.

Abstract. Vrancea is the major region with the highest seismic hazard in Romania. We investigate macroseismic data and analyze also the influence of local geological structure on earthquake intensities in many areas affected by these earthquakes. It's known that the soft sediments existing in many areas of the territory have also a strong influence on seismic ground motion. The topographic effects can be also responsible for this apparent amplification of the ground motion. In this paper we determined intensities according to MSK Macroseismic Scale for seven small to moderate earthquakes (M_w > 4.5) occurred between 2013 and 2020 in Vrancea seismogenic region. Following the shaking, many people submitted reports to NIEP via the online questionnaire in which recorded their experience, while others reported macroseismic observations in the classic questionnaires requested by NIEP experts to the local authorities. The intensity data points resulted after analysis of the collected macroseismic data showed that a maximum intensity of V ̶ VI was experienced for many localities for four of the seven earthquakes, also isolated/sporadic a few IDPs of degree VI were assigned. The shaking with intensity of V was experienced with a majority in the case of all the earthquakes studied here. Surprisingly, strong shaking of this intensity (V) was also experienced at great distances, about hundreds of km from the epicenter.

Abstract. Over the previous decades, seismic activity has sporadically increased along the western edge of the European Platform. Although the Romanian Seismic Network has been continuously enlarged, the growth in the number of events in the Romanian earthquake catalogue, ROMPLUS, in this area does not always follow the number of newly installed stations. To shed light on the patterns of seismic activity in this region, we performed a statistical analysis of events recorded between 2005 and 2021 in the ROMPLUS catalogue and used waveform correlation analysis to investigate the similarity degree and nature of these events. The poorly located events were relocated after the seismic phases were manually examined. We show that a large number of events are clustered around fault systems distributed near several quarries.

Abstract. Spectroscopy is one of the most powerful methods for finding the properties of celestial bodies. We describe a complete setup dedicated to obtain spectra of bright celestial bodies which can be used for long-term surveys. To prove it efficiency we present the preliminary results of the spectral observations performed for Betelgeuse (α Ori, a red super-giant star having the apparent magnitude ≈1.5). We obtained spectra of Betelgeuse during mid-February 2020, when the brightness of the star dropped with around 35%, indicating a cataclysmic event. Based on our obtained spectra over 350 - 850 nm wavelength interval, we identified the TiO (titanium oxide) absorption lines, a heavy compound that reveals the nature of a late stage star. We fitted the spectra continuum with a Planck function which indicated an equivalent temperature of 3500 K. We plan on using the setup, the data reduction and the data analysis methods shown here for a long-term monitoring of bright variable stars, and of some Solar System bodies of interest (e.g. bright comets).

Abstract. The main problem of teaching a higher course in nuclear physics at almost all universities is related to the lack of instruments for experimental verification of physical laws, concepts and facts. It is precisely the absence of equipment and the study of highly abstract concepts that lead to students' incomplete understanding of the material, i.e., the need to change the approach to the material, changing the position and roles of the participants in the educational process. The need for a change in access to material and access to teaching is emphasized through the increasingly strong connection of nuclear physics with energy and medicine. Therefore, the paper presents the method of conducting a higher nuclear physics course based on the application of a blended learning approach. Blended learning approach includes work at home and at university. Students had access to results obtained in scientific institutes using highly sophisticated equipment. For data processing, the students used the same programs as the researchers. This achieved a positive impact on student competencies, which were further deepened through active discussion in class.

Abstract. This article describes two interactive didactic tools created with Excel spreadsheets for the study of the circular motion. With the help of the first tool we can study the uniform circular motion, while with the second the non-uniform circular motion. For a moment in time introduced in the input data we calculate the angular position of the mass point in the circular motion and the number of rotations carried out until the respective moment. Also, we calculate the Cartesian coordinates in relation to the reference system whose origin coincides with the centre of the circular trajectory. Alongside the input data, we have rendered the motion chart so that by modifying the moment in time we can visualize the motion of the mass point on the circle. We have shown how to obtain the tool for the study of the non-uniform circular motion by completing and adapting the tool spreadsheets for the study of the uniform circular motion. The classroom use of these tools helps students with a better grasp of the analogy between the physics quantities that describe a linear motion and, respectively, a circular motion. A series of concepts can be clarified such as angular position, angular velocity, angular acceleration, normal acceleration etc. At the same time, students have the possibility of exploring the connection between the polar coordinates and the Cartesian coordinates in describing the circular motion. The tools can be adapted to numerically and interactively solve some common problems of circular motion. It is thus shown how the issue of meeting of two mobiles moving at different velocities on a circle of a given radius.

Abstract. The use of renewable and alternative energy sources is a priority in the context of sustainability. Students, in order to understand the different mechanisms of conversion of different types of energy into electricity, have at their disposal modern tools such as modeling phenomena through dedicated software, virtual and remote laboratories. This paper presents the software applications developed on the Google Colab platform designed to determine the theoretical parameters specific to fuel cells, the factors that influence the operation of these systems, respectively the electrode kinetic, mass transport parameters and the real efficiency of fuel cells. The advantages of the developed software applications are related to the simple way they can be used, as an interface between the user and the program algorithm and also to the possibility offered to students to make a direct connection between the complex theory of fuel cells and the actual operation.

Abstract. The high cost of the commercial laboratory equipment needed for nuclear physics experiments can create accessibility issues in many high schools. At the same time, the increasing demand for medical physics majors mandates a more engaging and attractive curriculum exactly during these formative years. For this reason, we introduce the MightyOhm Geiger counter as an important new player in the field of nuclear physics education. We present the Arduino code that performs the data collection, together with two classical experiments that investigate the natural background radiation: the statistics of nuclear decay and the decay of radon progeny.

Abstract. Applied physics is the bridge between theory and practical applications in everyday life. Due to its extensive, intricate capacity to model and forecast physical processes, computer science plays a vital role in this field. In this paper, we emphasize the significance of using computer-based approaches to analyze both the acquired material, and in particular the plasma itself. In addition, the collected materials provide a new viewpoint on the physics phenomena through the use of image processing. On the other hand, open-source tools (such as PlasmaPy) represent the key to accurately model plasma physical processes.