bluuebunny/crossref_metadata_2025 huggingface dataset:
Heterointerface engineering in Cr2GaC/C hybrids through bottom-up template synthesis for enhanced electromagnetic wave absorption
Authors: Hu Feiyue , Xie Shengyu , Wu Fushuo , Liu Jian , Zhang Peigen , Ding Jianxing , Fan Bingbing , Zheng Wei , Cai Longzhu , Sun ZhengMing
Published: November 2024

A novel 0D/1D Cr2GaC/C hybrid material with high electromagnetic wave absorption performance is developed, reaching a −59.0 dB reflection loss at 1.56 mm thickness and 15 wt% filler, offering enhanced polarization and conduction losses for stealth.
Performance enhancement of aqueous ionic liquids with lower critical solution temperature (LCST) behavior through ternary mixtures
Authors: Mahfouz Ahmed , Haddad Andrew Z. , Kocher Jordan D. , Menon Akanksha K.
Published: November 2024

Mixtures of two thermally responsive ionic liquids (ILs) in water exhibiting phase separation above a lower critical solution temperature (LCST) demonstrate a synergy that enhances the osmotic strength and lowers the LCST compared to binary mixtures.
Micromagnetic dynamics in field-free magnetization switching assisted by interlayer Dzyaloshinskii–Moriya interaction
Authors: Zheng Cuixiu , He Wenqing , Zhu Mo , Wan Caihua , Han Xiufeng , Liu Yaowen
Published: November 2024

In depth exploration of iDMI effect on SOT induced field-free switching. Digital encoding applications.
Molecular dipole interfacial engineering for high-performance quantum-dot light-emitting diodes
Authors: Yu Kuibao , Hu Hailong , Li Yuanhang , Huang Wenjuan , Qie Yuan , Zhong Chao , Chen Tao , Li Renjie , Guo Tailiang , Li Fushan
Published: November 2024

A Br-2PACz with large dipole moments is employed to modify the TFB/QD interface. The fabricated QLEDs present an outstanding EQE of 25.03% and a long lifetime of 14 695 h (T95 @1000 cd m−2).
Self-powered, temperature-sensitive, solar-blind photodetector based on a Pt–ZnGa2O4–Al Schottky junction induced by coupling of photovoltaic and interfacial pyroelectric effects
Authors: Huang Xiaoqian , Liu Kewei , Chen Xing , Wang Mingshuo , Zhu Yongxue , Yang Jialin , Cheng Zhen , Li Binghui , Liu Lei , Shen Dezhen
Published: November 2024

We present a strategy of coupling the photovoltaic and pyroelectric effect for a ZnGa2O4-based planar Schottky photodiode, which proves to be an effective method to realise higher responsivity and faster response time.
Molecular aggregation and crystallinity control enables improved performance of all-polymer solar cells
Authors: Yin Yuli , Shi Yu , Wang Xionglei , Chen Guoqi , Jiang Xingjian , Liu Ming , Guo Fengyun , Gao Shiyong , Zhang Yong
Published: November 2024

New n-type diimide-based random copolymers with controllable aggregation were developed for all-polymer solar cells that can be processed by high-boiling-point solvents.
A novel multi‐target TBD scheme for GNSS‐based passive bistatic radar
Authors: Tang Tao , Wang Pengbo , Zhao Peng , Zeng Hongcheng , Chen Jie
Published: November 2024

Global Navigation Satellite System (GNSS)‐based passive bistatic radar (PBR) systems hold promise for use as low‐altitude surveillance mechanisms in critical urban and suburban zones, attributed to their low power consumption, good concealment, and worldwide reach. However, the increasing demand for airspace regulation presents challenges for multi‐target tracking. Additionally, the limited power budget of GNSS signals results in low target SNR, restricting the detection range. Hence, a novel multi‐target track‐before‐detect (TBD) scheme is proposed. This strategy employs a dual‐channel coarse focusing (DCCF)‐based cluster centroid extraction algorithm to identify potential target information in the range Doppler (RD) domain. Subsequently, a modified cardinalised probability hypothesis density (MCPHD) filter is utilised, enhanced with a birth target intensity estimation module assisted by Doppler and a trajectory management module, to accurately track multiple targets under conditions of low SNR. Simulation results and performance analysis using the Optimal Sub‐pattern Assignment (OSPA) metric confirm the effectiveness of our approach. Furthermore, in a real‐world experiment using the GPS L5 signal as an illuminator, the authors successfully processed experimental data to track a civil aircraft over 10 frames, demonstrating the practical applicability of the proposed method in GNSS‐based PBR systems.
JADES: Balmer decrement measurements at redshifts 4 < z < 7
Authors: Sandles Lester , D’Eugenio Francesco , Maiolino Roberto , Looser Tobias J. , Arribas Santiago , Baker William M. , Bonaventura Nina , Bunker Andrew J. , Cameron Alex J. , Carniani Stefano , Charlot Stephane , Chevallard Jacopo , Curti Mirko , Curtis-Lake Emma , de Graaff Anna , Eisenstein Daniel J. , Hainline Kevin , Ji Zhiyuan , Johnson Benjamin D. , Jones Gareth C. , Kumari Nimisha , Nelson Erica , Perna Michele , Rawle Tim , Rix Hans-Walter , Robertson Brant , Del Pino Bruno Rodríguez , Scholtz Jan , Shivaei Irene , Smit Renske , Sun Fengwu , Tacchella Sandro , Übler Hannah , Williams Christina C. , Willott Chris , Witstok Joris
Published: November 2024

We present Balmer decrement, Hα/Hβ, measurements for a sample of 51 galaxies at redshifts z = 4 − 7 observed with the JWST/NIRSpec micro-shutter assembly (MSA), as part of the JWST Advanced Deep Extragalactic Survey (JADES). Leveraging 28-hour long exposures and the efficiency of the prism/clear configuration (but also using information from the medium-resolution gratings), we were able to directly probe the low-mass end of the galaxy population, reaching stellar masses, M⋆, as low as 107 M⊙. We find that the correlation between the Balmer decrement and M⋆ is already established at these high redshifts, indicating a rapid buildup of dust in moderately massive galaxies at such early epochs. The lowest-mass galaxies in our sample (M⋆ = 1 − 3 × 107 M⊙) display a remarkably low Balmer decrement of 2.88 ± 0.08, consistent with Case B, suggesting very little dust content. However, we warn that such a low observed Balmer decrement may also partly be a consequence of an intrinsically lower Hα/Hβ resulting from the extreme conditions of the ionised gas in these primeval and unevolved systems. We further compare the Balmer decrement to continuum-derived star formation rates (SFRs), finding tentative evidence of a correlation, which likely traces the underlying connection between the SFR and the mass of cold gas. However, we note that larger samples are required to distinguish between direct and primary correlations from indirect and secondary dependences at such high redshifts.
Collisional damping in debris discs: Only significant if collision velocities are low
Authors: Jankovic Marija R. , Wyatt Mark C. , Löhne Torsten
Published: November 2024

Context. Dusty debris discs around main sequence stars are observed to vary widely in terms of their vertical thickness. Their vertical structure may be affected by damping in inelastic collisions. Although kinetic models have often been used to study the collisional evolution of debris discs, these models have not yet been used to study the evolution of their vertical structure.

Aims. We extend an existing implementation of a kinetic model of collisional evolution to include the evolution of orbital inclinations and we use this model to study the effects of collisional damping in pre-stirred discs.

Methods. We evolved the number of particles of different masses, eccentricities, and inclinations using the kinetic model and used Monte Carlo simulations to calculate collision rates between particles in the disc. We considered all relevant collisional outcomes including fragmentation, cratering, and growth.

Results. Collisional damping is inefficient if particles can be destroyed by projectiles that are of much lower mass. If that is the case, catastrophic disruptions shape the distributions of eccentricities and inclinations, and their average values evolve slowly and at the same rate for all particle sizes.

Conclusions. The critical projectile-to-target mass ratio (Yc) and the collisional timescale jointly determine the level of collisional damping in debris discs. If Yc is much smaller than unity, a debris disc retains the inclination distribution that it is born with for much longer than the collisional timescale of the largest bodies in the disc. Such a disc should exhibit a vertical thickness that is independent of wavelength even in the absence of other physical processes. Collisional damping is efficient if Yc is of order unity or larger. For millimetre-sized dust grains and common material strength assumptions, this requires collision velocities of lower than ~40 m s−1. We discuss the implications of our findings for exo-Kuiper belts, discs around white dwarfs, and planetary rings.
A survey of extremely metal-poor gas at cosmic noon
Authors: Welsh Louise , Cooke Ryan , Fumagalli Michele , Pettini Max , Rudie Gwen C.
Published: November 2024

Aims. We aim to study the high-precision chemical abundances of metal-poor gas clouds at cosmic noon (2 < z < 4) and investigate the associated enrichment histories.

Methods. We analyze the abundances of four newly discovered metal-poor gas clouds utilizing observations conducted with Keck/HIRES and VLT/UVES. These systems are classified as very metal-poor (VMP), with [Fe/H] < −2.57, and one system qualifies as an extremely metal-poor (EMP) Damped Lyman-α (DLA) system with [Fe/H] = −3.13 ± 0.06. In combination with new high-resolution data of two previously known EMP DLAs and 2 systems reported in the literature, we conduct a comprehensive analysis of eight of the most metal-poor gas clouds currently known. We focus on high-precision abundance measurements using the elements: C, N, O, Al, Si, and Fe.

Results. Our findings indicate increasing evidence of elevated [O/Fe] abundances when [Fe/H] < −3. EMP DLAs are well-modeled with a mean value of [O/Fe]cen = +0.50 ± 0.04 and an intrinsic scatter of
σint[O/Fe] = 0.13-0.04+0.06.

While VMP DLAs are well-modeled with [O/Fe]cen = +0.40 ± 0.02 and σint, [O/Fe] = 0.06 ± 0.02. We further find tentative evidence of a redshift evolution of [C/O] across these most metal-poor DLAs with lower redshift systems showing elevated [C/O] ratios. Using the measured abundances, combined with a stochastic chemical enrichment model, we investigate the properties of the stellar population responsible for enriching EMP gas at cosmic noon. We find that the chemistry of these systems is best explained via the enrichment of just two massive progenitors, N⋆ = 2 ± 1, that ended their lives as core collapse SNe with a typical explosion energy Eexp = (1.6 ± 0.6)×1051 erg. These progenitors formed obeying a Salpeter-like power-law IMF, where all stars of mass greater than Mmax = 32-4+10M⊙

collapse directly to black holes and do not contribute to the metal enrichment.
Use of cycloidal rotors for airships
Authors: Dekterev Aleksandr , Kim Igor , Zverkov Ilya , Dekterev Dmitrii , Kretinin Vasiliy
Published: November 2024

A scheme for using cycloidal rotors to ensure high maneuverability of airships has been developed. High maneuverability indicators (turn on the spot, side slip, forward/backward movement, wind load parrying, operational change of flight altitude without the use of ballasting) of the airship with two cycloidal propellers was confirmed experimentally. A design of an airship with cycloidal propellers without a tail unit, providing a lifting capacity of the airship of 3 tons and the possibility of loading and unloading without mooring devices was proposed.
Photoconductivity of graphene with titanium nanoparticles
Authors: Sorokin Dmitry , Gareev Timur , Zaitsev Oleg , Smovzh Dmitry
Published: November 2024

To date, the use of graphene in photodetecting devices has attracted great attention, since due to the absence of a band gap and the linear law of dispersion of free charge carriers, graphene has a wide range of photon registration and fast response time. However, due to the low amount of incident light absorption by graphene, the efficiency of graphene devices is limited, so improving the efficiency of light absorption remains one of the key tasks. In this paper, we present a method for enhancing the photoresponsivity and external quantum efficiency of graphene based on modification of the graphene surface by highly lightabsorbing titanium nanoparticles by magnetron sputtering.
Active ways to control jet flows
Authors: Yakovenko Sergey , Demidenko Natalya , Vankova Olga
Published: November 2024

Jet flows with active control methods are numerically studied. Axial, flapping and helical oscillations of the inlet velocity profile, transverse vibrations of the inlet boundary, and harmonic disturbances from sources located on the lateral boundaries are considered. The process of branching of a submerged round jet under the external excitations is explored depending on their type and amplitude.
Development of phase doppler anemometry method with a measurement object in the form of a cylinder
Authors: Kabardin Ivan , Meledin Vladimir , Dvoynishnikov Sergey , Rahmanov Vitaly , Pavlov Vladimir , Zubanov Kirill
Published: November 2024

Developing methods for diagnosing particle sizes in an aerodynamic flow is a pressing issue in a number of technical applications such as engine building, power engineering, coating, and others. One of the methods for diagnosing particle sizes is the phase Doppler anemometry (PDA) method. It is a laser optical method for simultaneously measuring the speed and size of spherical particles. The purpose of this work is to test the performance of a method that implements phase Doppler anemometry to obtain the dependence of the phase shift on photodetectors on the diameters of the wires. The work presents a differential optical scheme of the installation with a helium-neon laser as a radiation source.
Comprehensive approach to modeling electricity consumption and identifying patterns using data mining methods
Authors: Tynchenko Vadim , Kozlova Anastasia , Kukarceva Svetlana
Published: November 2024

In this study, a detailed analysis of a dataset related to electricity consumption under various conditions was conducted. The dataset includes comprehensive information such as indoor temperature at the time of data recording, humidity levels, room size, number of people present, use of heating, ventilation, and air conditioning (HVAC) systems, lighting, day of the week, and the presence of holidays. This extensive coverage of factors provides an opportunity for a deep understanding of the relationships between electricity consumption and different variables. Several significant patterns were identified during the analysis. One key finding was the detection of a connection between temperature readings and electricity consumption, confirming the importance of temperature conditions in energy usage. A correlation was also found between energy consumption, HVAC system use, and humidity levels, indicating the substantial impact of these factors on overall electricity consumption. Other factors such as lighting use, holidays, renewable energy sources, and the day of the week also proved significant during factor analysis. These results were further validated using Self-Organizing Maps (SOMs), which demonstrates the reliability of the identified patterns. However, when attempting to model the data, the results were less satisfactory. The models showed only marginal improvement when combining methods, suggesting the need for further work. To achieve more accurate and reliable results, it is recommended to supplement the dataset with additional information or apply more sophisticated analytical methods. These steps will help improve model quality and more effectively utilize the identified patterns for forecasting and optimizing electricity consumption.
On the saturation of excitation-dependent dipole-dipole broadening in dense Rb vapour
Authors: Bobrov Andrei , Sautenkov Vladimir , Saakyan Sergey , Zelener Boris
Published: November 2024

We study dependence of dipole-dipole interaction in dense Rb vapour on optical excitation. We measure the dipole-dipole contribution to the selective reflection spectrum of D2 line. Optical excitation is created by intense laser beam, which depletes the 5S1/2 population and decreases the dipole-dipole interaction, narrowing the observed spectrum. The limit of the dipole-dipole interaction change is determined by the optical saturation of the D2 transition and corresponds to the 5S1/2 population approximately equal to 1/3.
Improvement of engineering methodology of design of shell-and-tube heat exchangers in MathCad mathematical system
Authors: Lebedev A. R. , Romanov V. V. , Alekhin N. S. , Kireev S. O. , Galka G. A.
Published: November 2024

The problems of optimal design of shell-and-tube heat exchangers, widely spread in industry, acquire new aspects of relevance due to the rapid development of digital design technologies and computer mathematics systems. The review of works of domestic and foreign researchers in the field of design of shell-and-tube heat exchangers is carried out. The aim of the work is to increase the efficiency of shell-andtube heat exchanger design by applying the methods of optimal design. Materials and methods. The traditional method of calculation of shell-andtube heat exchanger is analyzed, on the basis of which the ways of its modernization are determined A new calculation scheme consisting of three parts is proposed. In the first part, formulas and reference data are used, the calculation and selection of which do not require the use of search procedures. The second part consists of a set of functions describing the design parameters of the heat exchanger, the arguments of which are control parameters. The third part of the method solves the optimization problem of obtaining the extremum of the target parameter under the action of a number of constraints on the structural parameters of the apparatus. To verify the efficiency of calculations, a parametric solid-state model of the heat exchanger is used, with the use of which the thermal-hydraulic calculations were carried out. The results of the research. On a concrete example it is shown that the proposed methodology of optimal design of shell-and-tube heat exchanger allows to obtain a design with minimum total weight of tubes. A number of calculations of the heat exchanger are carried out to illustrate that it is practically impossible to achieve the optimal parameters of the apparatus by methods of “manual counting”. Thermal-hydraulic calculation of the optimal design of the apparatus showed good adequacy of the results obtained by the proposed method and the data of thermal calculation with the help of CAD-system.
Operation of the air conditioner with cooling of the compressor oil bath
Authors: Galka G.A. , Alekhine S.N. , Romanov V.V. , Bazhutkina N.A.
Published: November 2024

The paper analyzes the efficiency of an air conditioner with additional cooling. The analysis of various designs has shown that there are a number of opportunities to improve their circuit and design solutions, as well as the use of additional reserves that increase the energy efficiency of air conditioners. The paper proposes a method for improving the operation of an air conditioner by introducing additional cooling. Temperature versus time dependences were plotted for various thermal loads on the condenser and evaporator. The data obtained in this work are the results of a study of the use of condensate to reduce the temperature level of the condenser compressor.
Stirling engine: Construction and performance analysis at low temperatures
Authors: Muradov Muzaffar , Tuychiyeva Makhliyo , Muradov Rivajiddin , Axmedov Avazbek
Published: November 2024

Stirling engines, categorized as hot air engines, offer remarkable versatility by operating on a variety of fuel sources, which is a significant advantage in the context of energy diversification and sustainability. This thesis focuses on the experimental evaluation of a beta-type Stirling engine specifically designed to operate efficiently at low temperature differences. The experiments conducted demonstrated the feasibility of this engine configuration to function effectively even under lower thermal gradients, with a notable operational temperature differential of 80°C. The results revealed a direct correlation between the temperature difference and the engine’s performance, as evidenced by an increase in the number of revolutions per minute (RPM) corresponding to a rise in temperature differential. This research underscores the potential applications of low-temperature-difference Stirling engines in various energy systems, propelling advancements in clean energy technologies while enhancing their practicality in real-world settings. The findings contribute to a deeper understanding of Stirling engine mechanics and their role in sustainable energy solutions.
Development of nonlinear control laws for electric power systems through a synergetic approach
Authors: Umurzakova Dilnoza , Sobirov Muzaffar , Khakimov Akhror , Qadamova Zulayho
Published: November 2024

This paper presents a novel synthesis method for nonlinear solar control within electric power systems (EPS), leveraging the concept of synergistic electricity. With the increasing complexity of power systems, particularly under variable operating conditions, managing external piecewise constant perturbations becomes crucial for maintaining system stability and performance. The proposed algorithm is designed to effectively regulate processes within the computer system, ensuring a smooth integration of renewable energy sources like solar power. Comprehensive experiments validate the effectiveness of this method, demonstrating its adaptability and stability across diverse conditions. Additionally, an in-depth analysis of various techniques reveals the versatility of the proposed approach, highlighting its capability to enhance control mechanisms within power systems. By addressing the key challenges associated with nonlinear control, this research contributes significantly to improving the stability and reliability of power grids, which is vital for the sustainable integration of renewable energy and the advancement of modern energy systems.
Research of error electromagnetic current-to-voltage converters with flat measuring windings in the recesses of the magnetic circuit
Authors: Siddikov Ilkhomjon , Khujamatov Halimjon , Temirov Azizbek , Atadjanova Nozima
Published: November 2024

There are many signal converters of the magnitude and parameters of direct and alternating current, but it is necessary to briefly review them to choose the optimal type of current converters for monitoring and control systems of energy sources in distributed telecommunication systems. advantages and disadvantages and evaluation of their development prospects and application in the hybrid system mentioned above. control of power supply sources. The most widely used electromechanical current converters in various flow monitoring and control systems have a simple and technological design, but they have a moving measurement part, which reduces their reliability and limits the scope of application.
Design and modelling of positive LDO voltage regulator
Authors: Rybalka Sergey , Demidov Andrey , Kulchenkov Evgeny
Published: November 2024

In present study the total ionizing dose effects in a positive low-dropout linear voltage regulator IS-LS1-3.3V was investigated experimentally using the developed the X-ray research complex. It is established that the output voltage is changed slightly in all total ionizing dose intervals and voltage regulator preserves a functional state without failure. The analytical functional dependence of the output voltage on the total ionizing dose is determined. The circuit diagram and voltage regulator SPICE macromodel for circuit simulations taking into consideration total ionizing dose effects have been developed.
Investigation of signal propagation in a gradient crystal of lithium niobate
Authors: Suhanov A. , Stroganova E. , Galutskiy V.
Published: November 2024

The relevance of this problem is due to the possibility of studying the influence of processes inside a gradient lithium niobate crystal, which can improve the quality of signal transmission. The properties of gradient lithium niobate as a phase modulator of an optical signal are modeled. The differences in the behavior of a gradient modulator from a modulator with a constant composition are investigated when the wavelength of the signal and the applied voltage change.
Dielectric constant and losses in a magnetic field in RexMn1-xS solid solutions (Re = Gd, Yb)
Authors: Kharkov A. M. , Cheremnykh N. A. , Voronova E. G. , Bandurina O. N. , Pavlova A. N.
Published: November 2024

Polycrystalline samples GdxMn1-xS and YbxMn1-xS with a concentration x = 0.2, near the ions percolation concentration through the face-centered cubic lattice, are studied in order to determine fluctuations in the valence of the ytterbium ion on dielectric properties. Dielectric constant and dielectric losses were determined from measurements of capacitance and loss tangent in the frequency range 102–106 Hz at temperatures of 80–500 K without a magnetic field and in a magnetic field. The magnetic capacity and dielectric losses in the magnetic field of the sample were determined from the relative change in the real and imaginary parts of the dielectric constant of the sample in a magnetic field H = 12 kOe applied parallel to the capacitor plates. Dielectric losses decrease in a magnetic field. The magnetic capacity decreases by an order of magnitude in Gd0.2Mn0.8S compared to Yb0.2Mn0.8S. The dielectric constant in both compounds is described in the Debye model with the activation dependence of the relaxation time on temperature, where the activation energies differ for ytterbium and gadolinium ions.
Mathematical modelling of dynamic processes in pressure measurement systems in gas-liquid media
Authors: Velmisov P.A. , Tamarova Yu.A.
Published: November 2024

The object of the study is a mathematical model of a system for monitoring pressure changes in the combustion chamber of an aircraft engine, the components of which are a pipeline and a sensor. In the course of the study, the problem is reduced to a linear equation with a deviating argument. The objective of the work is to construct solutions to the equation with a deviating argument and apply them in an application to the problem of studying the dynamics of an elastic element of a pressure sensor interacting with a gas or liquid. By introducing a small parameter, an approximate equation is obtained that relates the deformation of the elastic element of the sensor and the law of change in pressure of the working environment in the engine. For this equation, a program has been developed in the Mathematica system that allows obtaining graphs of the deformation of the elastic element of the sensor in cases of rigid clamping and hinged fastening for different values of the system parameters. A numerical method for studying the equation based on the Runge-Kutta method is also proposed. The conducted study provides an opportunity to determine the optimal values of the parameters of mechanical pressure measurement systems at the design stage.
Determination of droplet size and flow breakup mechanisms in centrifugal contact devices
Authors: Salin Alexey
Published: November 2024

This article investigates the mechanisms of droplet breakup and the determination of droplet size in centrifugal contact devices, focusing on phase separation and mass transfer processes. The study highlights the critical role of turbulent pulsations and the rotational speed of the rotor in influencing droplet deformation and breakup. Based on the Kolmogorov-Obukhov theory of turbulence, the paper presents theoretical and experimental approaches to predict droplet behavior and optimize the geometry of contact devices. Key findings demonstrate that increased rotor speed and nozzle design significantly impact droplet size reduction, improving interaction efficiency between phases. The results are applicable to the optimization of centrifugal apparatuses used in chemical processes and phase separations.
Analysis of the reality of the sand quarry industry in karbala governorate
Authors: Dawood Salman Olaa , Ayad Abboud Dalia , Hassan Ali Kawthar
Published: November 2024

The research focuses on the significance of sand quarry operations in Karbala Governorate, highlighting their economic benefits, particularly in reducing unemployment amid a severe economic crisis. Despite their importance, the industry suffers from government neglect, including high contracting fees and lack of energy support, which inflates production costs. The study utilized a descriptive and analytical approach, including field research on local quarries, emphasizing the need for better infrastructure and support for this vital sector.
Forecasting seismic activity using machine learning algorithms
Authors: Kukartsev Vladislav , Degtyareva Ksenia
Published: November 2024

In this paper, the possibility of using the random forest method to predict earthquake locations based on historical data was studied. The aim of the work was to develop a model capable of accurately predicting the geographical coordinates of earthquakes in India and adjacent regions. The model showed high accuracy of predictions, which is confirmed by low values of the mean quadratic error (MSE) and high coefficients of determination (R2). Analysis of the results showed that the model successfully captures patterns in the data and is able to accurately predict earthquakes in regions with high seismic activity. At the same time, areas with deviations were identified, which highlights the need for further research to improve the model and increase its accuracy. This study demonstrates the promise of machine learning methods in seismological forecasting tasks and can serve as a basis for creating more accurate earthquake early warning systems.
Geophysical techniques for modeling mine structure and tectonic disturbances
Authors: Bermukhambetov V. A. , Melnik V. V.
Published: November 2024

This article presents the results of modeling the structural structure of a rock mass during underground mining operations. The research was carried out at one of the largest mining and processing plants in the Republic of Kazakhstan – Donskoy GOK. The spectral seismic profiling method, which has proven itself well for working in underground conditions, based on the seismoacoustic properties of the rock mass, was chosen as a tool for diagnosing the array. The purpose of the research was to diagnose the structural structure of the mine field in order to select the locations of drainage wells intended for drainage of mine workings and ore body. As a result of the research carried out, a structural model of each horizon and the mine as a whole was built, which allows us to determine with sufficient reliability the most promising sites for drainage work. In addition, the results obtained will be used to design vertical mine workings within the studied area. The results obtained were confirmed by verification drilling and proved their effectiveness and reliability.
Implementing dynamic VR levels for tower crane training
Authors: Kashapova Dilyara R. , Kostyuk Daniil I. , Mukhametkhanov Ilnur R. , Nadyrshina Cristina R.
Published: November 2024

The article describes the application of virtual reality (VR) technologies in the training of hoisting vehicle operators, with a focus on improving the efficiency and safety of the educational process. Traditional methods of training are associated with high costs and significant risks, but virtual reality allows to create a safe and controlled environment for practising professional skills. The architecture of the developed VR simulator is discussed, including realistic crane reproduction, interaction with a virtual slinger and modelling of different weather conditions. An important aspect of the simulator is the procedural generation of content, which allows the creation of unique training scenarios, thus greatly diversifying the learning process. The use of virtual characters adds realism and interactivity to the learning process, allowing users to practice solving complex tasks while interacting with others in the workplace. Research shows that the use of VR in training tower crane operators not only improves the quality of training, but also helps to reduce errors in the initial stages of work. The article emphasises that dynamically variable levels play a key role in adapting the learning process to individual learner needs, making VR training a powerful tool for training professionals in the construction industry.
Increasing the wear resistance of agricultural machinery parts by laser surfacing
Authors: Biryukov Vladimir
Published: November 2024

The paper presents the results of metallographic studies and tribotechnical tests of coatings containing in the composition of the charge a powder based on iron and nickel in a ratio of 4:1 and powder of ultrafine tungsten carbide (WC) 5 and 7 wt.%. Slip coatings were applied to 65Mn steel samples using an oxy-ethyl cellulose based binder. Coatings deposited by a laser beam were obtained when exposed to a defocused and oscillating laser beam. It was found that the performance of laser surfacing using transverse vibrations of the laser beam is 1.5-2.1 times higher than when processing with a defocused beam. The maximum values of microhardness 942-1190 HV were obtained when 7 wt.% WC was introduced into the charge. Scanning electron microscopy methods have established that the distribution of the charge elements along the height of the deposited layer is fairly uniform. Abrasive wear tests were performed according to the scheme: “the wide side of the flat sample is the annular surface of the rubber disc.” Quartz sand was fed into the friction zone using a dispenser. It was found that the abrasive resistance of a multicomponent charge and with additives of 5 and 7 wt.% carbides, respectively, is 2.45, 3.29, and 4 times higher than the base material of 65Mn steel.
The environmental condition in the area of rock dumps at the Vostochny section of the Republic of Kazakhstan
Authors: Karasartova Chynarkul , Bekboeva Alaigul , Koskeyeva Assemgul , Kurbanova Nazira , Smagulov Nurtas , Amrina Minar
Published: November 2024

The article analyzes the state of environmental components in the area of the Pribortovoy and Festival overburden rock dumps at the Vostochny section. During the research, a slightly elevated content of elements such as arsenic, copper, lead, and others was noted, allowing them to be grouped as associative elements. Based on statistical data, the authors present the results of chemical analyses of samples for the content of water-soluble and mobile metal compounds in soils that are part of the association of pollutants. It is concluded that, at present, wind transport of particles from overburden dumps does not significantly affect the state of the soil cover. The analysis shows that the pollution level of the region's ecosphere is mainly determined by harmful waste from industrial enterprises and transport.
Statistical analysis of seasonal variations in pollutant concentrations in urban atmosphere
Authors: Kozlova Anastasia , Stepantsevich Marina , Kukartsev Vladislav , Losev Aleksey , Yagudaeva Natalya
Published: November 2024

In the context of global climate change and urbanization, the issue of air quality is becoming increasingly relevant. Air pollution poses a threat to human health and ecosystems, highlighting the need for monitoring the concentrations of pollutants. This study examines the seasonal variations in the concentrations of harmful substances in the urban atmosphere using statistical methods. The aim of the research is to analyze time series data on concentrations of carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3), ammonia (NH3), and particulate matter (PM2.5 and PM10). Correlation and factor analysis are employed to assess the relationships between pollutants and identify underlying factors. The analysis of data collected over several years emphasizes seasonal changes, showing that pollutant concentrations are subject to significant fluctuations driven by both natural and anthropogenic factors. The results can be used to develop strategies for improving air quality and predicting the health impacts of pollution on the population. This research deepens the understanding of the dynamics of atmospheric pollution and its seasonal dependence, which is important for shaping environmental policy and management decisions.
Determination of aluminum, iron and copper content in water of spring No. 31 of Apatity-Kirovsky district
Authors: Sergiyanskiy Evgeniy , Volkova Sofya , Kirillov Ivan
Published: November 2024

The article deals with the issue of determining the concentration of metals such as aluminum, iron and copper in spring water of spring No. 31. At the beginning of the article the importance of water as a basic element of life on Earth and its influence on human health is discussed. The main focus is on the study of drinking water quality in the area of the Kola Peninsula, in particular, in the Apatity-Kirovsky region at the foot of the Khibiny Mountains. It is mentioned that the composition of water can be disturbed due to the presence of various metals, with potentially negative health effects. Methods for analyzing water for heavy metals are described, with emphasis on atomic absorption spectrometry and the use of the SHIMADZU spectrometer for accurate determination of metals in spring water. The analyzed spring water samples are analyzed for the determination of metal concentrations and the results are presented. At the end of the work, based on the obtained data, a comparative analysis with MPC of non-centralized water supply sources is carried out, and a conclusion is made about the suitability for consumption of water from spring No. 31.
Automated baggage screening and logistics system for enhanced airport efficiency
Authors: Kleshko I.I. , Tynchenko V.S. , Kukartseva S.V. , Solovyova T.V. , Nizameeva A.V.
Published: November 2024

Air transport plays a vital role in modern life, facilitating efficient logistics and connectivity across distant cities and countries. However, airports face numerous challenges in ensuring safety, speed, comfort, and security for passengers and their belongings. This paper addresses the pressing need for innovation in airport operations, focusing on automating baggage screening and logistics processes to streamline operations and enhance overall airport efficiency. By deploying a sophisticated automated system, airports can delegate logistics tasks to automation, accelerate processes, minimize paperwork, improve incident management, optimize luggage loading strategies, and enhance lost luggage retrieval. Such innovations promise to expedite baggage handling without compromising safety, thereby elevating the quality of service and passenger satisfaction.
Optimization of a complex of technological equipment for aircraft processing
Authors: Konovalov Anatoly , Skripko Alexander , Kvaschin Ivan
Published: November 2024

When icing, aerodynamic surfaces of the aircraft, negative changes in the impact of the air flow on them occur, which leads to a noticeable drop in wing lift, a decrease in the efficiency of the rudders, a decrease in the aircraft and loss of control. In order to optimize the complex of technological equipment for anti-icing treatment of the aircraft, the necessary studies of materials and methods of anti-icing treatment of aircraft were carried out, based on the KNO-AERO-MA complex, designed for processing (washing, anti-icing protection) of the outer surfaces of aircraft, due to the existing pumping equipment in the system of collecting and returning the spent solution. The essence of the filtering technology is to clean solutions from harmful impurities through a special porous medium, the so-called filter. The created simplified model of a high-speed pressure vertical filter made it possible to study one or more filter links of the filter column. According to the research results, in order to optimize the technological equipment complex during aircraft anti-icing treatment, in the system of collecting and returning spent solutions for repeated anti-icing treatment of aircraft, it is recommended to use a highspeed pressure vertical granular filter. The introduction of such a system will allow servicing several aircraft simultaneously, significantly reduce the cost price and improve the environmental friendliness of this technological process. Keywords: icing, aircraft aerodynamic surfaces, optimization of the technological equipment complex, aircraft anti-icing treatment, system of collecting and returning spent solution, filtration technologies, high-speed pressure vertical granular filter, reduce the cost price, improve the environmental friendliness of the process.
Wireless data transmission to control and monitor the railway point machine
Authors: Boltayev Sunnatillo , Rakhmonov Bobomurod , Yusupov Azizjon , Kosimova Qamara , Muhiddinov Obidjon , Joniqulov Egamberdi
Published: November 2024

It is possible to reduce the costs of railway point machines by using the method of transmitting and receiving data using wireless communication to monitor and control the railway point machine. This research paper examines a method of secure data encoding for secure wireless transmission of data for railway point machine control and control. Data coding for wireless monitor and control of railway point machines was mathematically modeled using a cyclic code. This is further enhanced by wireless monitor and control of railway point machines based on self-diagnosis of cyclic codes in data transmission and reception.
Preface
Authors: Srimanobhas Norraphat , Ittisamai Pawin , Uttayarat Patipan , Pongkitivanichkul Chakrit
Published: November 2024

The 22nd Flavor Physics and CP Violation (FPCP) Conference, held in Bangkok, Thailand, at the Faculty of Science, Chulalongkorn University, provided a vital forum for the exchange of new ideas and presentation of the latest experimental and theoretical advances in flavor physics and CP violation. This conference series, born from the merging of the Heavy Flavor Physics Conference and the International Conference on B Physics and CP Violation in 2002, continues to attract experimental and theoretical physicists worldwide who share an interest in these dynamic fields. Co-organized by Chulalongkorn University, Chiang Mai University, Khon Kaen University, Srinakharinwirot University, and Suranaree University of Technology, the conference featured a comprehensive program with 9 tracks and welcomed 121 registered participants from across the globe. Over the 5-day event, participants engaged in scientific discourse through 47 invited plenary talks and 46 parallel presentations, reflecting the conference’s commitment to fostering discussions and collaborations in flavor physics and CP violation.
Theory of rare hadronic decays
Authors: Fedele Marco
Published: November 2024

In this proceeding we will review the current theoretical status of rare hadronic decays, with a particular focus on decays of the B meson. These decays are indeed excellent indirect probes while searching for New Physics. Given the current experimental situation at colliders, where no new particles have been directly produced, rare decays provide a fundamental and alternative approach in the search for Physics beyond the Standard Model. In particular, the following classes of decays will be here reviewed: Bq → τν, Bq → µµ, B → K(∗)νν¯, B → K(∗)ℓℓ, Bs → ϕℓℓ and b → sγ. We will provide the most updated Standard Model predictions, highlight which are the main sources of uncertainty, and give the current status of New Physics searches in these channels when confronting the theory predictions to current experimental results.
Rare B decays at e+e− colliders
Authors: Tiwary Rahul
Published: November 2024

The rare decays of B mesons offer a prime opportunity to test predictions of the Standard Model and to search for effects beyond the Standard Model. The coherent production of B mesons at e+e− colliders provides a clean experimental setup for these studies. In this paper, we discuss the recent results of rare B decays from the Belle and Belle II experiments.
The KM3NeT neutrino telescopes in the Mediterranean Sea: Current status and prospects focusing on KM3NeT/ORCA
Authors: Tzamariudaki Ekaterini
Published: November 2024

The KM3NeT research infrastructure is building second-generation neutrino telescopes in the depths of the Mediterranean Sea. The KM3NeT/ARCA detector at a depth of about 3500 m off the coast of Sicily, Italy, focuses on the detection of high energy (E > TeV) neutrinos from astrophysical sources. The KM3NeT/ORCA detector at a depth of about 2500 m off the coast of Toulon, France, is aimed at studying low energy (E > GeV) atmospheric neutrinos for measuring the neutrino mass hierarchy and for gaining insight on fundamental neutrino properties. In this contribution, results obtained during the early stages of the detector construction as well as the expected performance of the completed detectors are presented.
Neutrino mass experiments: Current and future
Authors: Thorne Larisa A.
Published: November 2024

Nearly 70 years since the neutrino was discovered, and 25 years since discovery of neutrino oscillations established its non-zero mass, the absolute neutrino-mass scale remains unknown. Due to its unique characteristics, determining this neutrino property requires new measurement techniques to be developed. Currently, there are four measurement approaches: using cosmological models, inference from time-of-arrival from supernovae, through observation of neutrinoless double beta decay, and the kinematics of weak decay processes.

I will review the theoretical basis underlying neutrino mass measurement and present key experiments in this field. I will highlight the current best upper limits, how neutrino mass experiments are complementary to other neutrino property searches, and summarize the challenges that lie ahead of the neutrino mass community.
Leptogenesis in a Left-Right Symmetric Model with double seesaw
Authors: Patel Utkarsh , Adarsh Pratik , Patra Sudhanwa , Sahu Purushottam
Published: November 2024

We explore the connection between the low-scale CP-violating Dirac phase (δ) and high-scale leptogenesis in a Left-Right Symmetric Model (LRSM) with scalar bidoublet and doublets. The model’s fermion sector includes one sterile neutrino (SL) per generation to enable a double seesaw mechanism in the neutral fermion mass matrix, implemented by performing type-I seesaw twice. The first seesaw generates the Majorana mass term for heavy right-handed (RH) neutrinos (NR), and in the second, the light neutrino mass is linearly dependent on S L mass. We use charge conjugation (C) as the discrete left-right (LR) symmetry, aiding in deriving the Dirac neutrino mass matrix (MD) in terms of light and heavy RH neutrino masses and the light neutrino mixing matrix UPMNS (containing δ). We demonstrate the feasibility of unflavored thermal leptogenesis via RH neutrino decay using the obtained MD and RH neutrino masses as input. A thorough analysis of the Boltzmann equations describing asymmetry evolution is conducted in the unflavored regime, showing that the CP-violating Dirac phase alone can generate the required leptonic asymmetry for given input parameters, with or without Majorana phases. Finally, we discuss constraining our model with current and upcoming oscillation experiments aimed at refining the value of δ.
Topological diagrammatic approach for charmed baryon decays
Authors: Cheng Hai-Yang , Xu Fanrong , Zhong Huiling
Published: November 2024

There exist two distinct ways in realizing the approximate SU(3) flavor symmetry of QCD to describe the two-body nonleptonic decays of charmed baryons, the irreducible SU(3) approach (IRA) and the topological diagram approach (TDA). The TDA has the advantage that it is more intuitive, graphic and easier to implement model calculations. We perform a global fit to the experimental data of two-body charmed baryon decays based on the TDA and discuss its equivalence with the IRA and their phenomenological implications.