bluuebunny/crossref_metadata_2025 huggingface dataset:
Prerequisites for the transition to a knowledge-based economy in the context of structural transformation, quality of life and economic growth
Authors: Makhosheva Salima , Shardan Saida , Gergova Zalina , Uyanaeva Khalimat , Makhoshev Artur
Published: December 2023

The modern world is undergoing a rapid structural transformation driven by the growth of intelligent systems and environments. These AI and IoT-based systems provide new opportunities to increase productivity, optimize resources and improve the quality of life. However, the transition to an economy of intelligent systems and environments also introduces challenges and requires a strategic approach. Artificial intelligence is becoming a key driver of the intelligent systems economy. This section of the article analyzes the impact of AI on factory automation, data management and decision making. It also discusses the need to develop an appropriate regulatory and legal framework for the use of AI. The Internet of Things (IoT) allows objects and devices to be connected and exchange data. The article examines the impact of IoT on industry, healthcare, transport and urban infrastructure. The role of standardization and security in the development of IoT is discussed. The transition to an economy of intelligent systems is often accompanied by the automation of routine work tasks. The article examines the impact of automation on the labor market and proposes measures to prepare the workforce for changes in the economy. The rise of the smart system economy provides an opportunity to improve the quality of life of citizens. However, it is necessary to take into account the issues of privacy, security and accessibility of technologies for all segments of the population. This section of the article analyzes the relationship between economic growth and living standards.On the basis of the author’s model of increasing the efficiency of the regional economy, a mechanism for increasing economic growth in the economies of the North Caucasus republics and the Stavropol Territory has been identified. The prevailing role of such factors as: the number of employees, gross regional product, investment, per capita income, etc., factors in ensuring economic growth in the Republic of Dagestan, the Stavropol Territory is proved. At the same time, these factors did not have a decisive influence on the dynamics of the socio-economic development of the Kabardino-Balkarian Republic. Elasticity between factors is calculated, which shows the different architecture of regional economies. Based on them, resource replacement matrices are constructed, the manipulation of which allows you to control the development path of the regional system.
Caravanserais and their importance on caravan routes
Authors: Ergashev Jakhongir
Published: December 2023

The article analyzes the processes related to the caravansary existing in the Bukhara Khanate, their architecture, structure, activities, services provided in the caravansary, its types, security system in the caravansary, and their specialization by industry.
Innovative strategy for the development of a depressed region
Authors: Malyshev Denis , Nikolaev Mihail
Published: December 2023

The problem of choosing a strategy for the development of depressed regions is of particular importance both from the point of view of ensuring economic security and improving the dynamics of the national economy. At the same time, most regions trapped in depressiveness during the period of market reforms, cannot reach the trajectory of sustainable economic growth. One of the reasons for this situation is the underestimation of the importance of the innovative strategy. The purpose of the work is to develop methodological aspects of the formation of an innovative strategy and the justification of effective tools for its implementation. The official statistics of Rosstat, as well as the strategies of socio-economic development of the regions of the North-Western Federal District are used as the information base of the study. The research methodology is based on the systematization of effective tools to support the economy of depressed regions, presented in the scientific literature, as well as the analysis of the regional practice. The paper systematizes the principles of strategy formation, the priority of human capital development is among the most important, as well as the need for an ecosystem approach that ensures effective interaction of all participants in the innovation process. The systematization of regional practice made it possible to identify the declaration of innovative strategy in the strategic documents of depressed regions. Thus, the importance of integration tools that make it possible to use external resources and compensate for the problem of insufficient own scientific and technical potential is underestimated. The results of the study contribute to the development of strategic planning methodology at the regional level.
Cement concrete pavements technology at construction of main roads in Uzbekistan conditions
Authors: Miralimov M. , Abirov R.A.
Published: December 2023

Uzbekistan’s road specialists have begun implementing a number of technological solutions in the construction and maintenance of roads. One of the most interesting innovations is the use of pavements and bases of main roads with compacted cement concrete. Such pavements are much stronger and more durable than existing. At construction of highways and main roads of international importance using of compacted cement concrete for which fall on loads from “cargo traffic”, will significantly prolong their durability and reduce time spending on laying. At present for the start of using of modern technology pilot tests are carried out and necessary guidelines have developed and these results presented in this issue.
Using penalty function method in identification stiffness of elastic spring of the underground structure
Authors: Nguyen Xuan Bang
Published: December 2023

This paper studies a method to identify the spring stiffness of the frame - soil structure. The model of the problem is a two-dimensional structure, linear elastic deformation, model of soil using the Winkler model (with normal, tangential spring). The problem will be solved by the penalty function method - the minimum of the objective function - combined with the finite element method. The numerical calculations show that the model, algorithm and calculation program are reliable. The program can be used to identify the spring stiffness of the frame - soil structure in two dimensions, serving to determine the actual working state of the structure, to propose solutions for reinforcement, repairing, improving bearing capacity, prolonging the life of the structure.
Monotonic and cyclic load of pine wood under uniaxial compression: experiments and modeling
Authors: Kolesnikov G.N. , Nazarev D.P.
Published: December 2023

To analyze the behavior of wood under uniaxial monotonic deformation, we applied an analytical model to separately control of the pre-peak and post-peak branches of the load-displacement curve. Two criteria for the transition of wood into the plastic stage of deformation are considered. To analyze the behavior of wood under cyclic uniaxial deformation, we used the load-displacement curve obtained for monotonic deformation as an envelope. Equations for the plotted of load-displacement curves under cyclic loading with incomplete unloading are proposed. As an experimental and model illustration, the behavior of a pine specimen under cyclic uniaxial compression with incomplete unloading in the range from 8 to 15 kN is considered. Because the highest cyclic load exceeds the load at the point of transition of wood into the plastic stage, the deformation process has already after 54 cycles moved to the downward branch of the load-displacement curve for monotonic deformation. The simulation results are in agreement with experimental and literature data, which suggests the suitability of this method for the study of some wood-based composites.
Wood raw materials and wood waste use for the building materials production (on the example of the Republic of Karelia timber industry)
Authors: Kuzmenkov Alexander , Galaktionov Oleg , Karpov Maxim , Emelianova Elena
Published: December 2023

The research is devoted to material resources analysis of the Republic of Karelia timber industry for the production of construction materials and to the optimal directions search for wood waste and illiquid wood use. The requirements for raw materials are analysed and inconsistencies in the classification of wood waste resources are revealed. Various methods of wood processing are considered and characteristic features and limitations on the applicability of raw materials in terms of size, quality, and breed characteristics are revealed. The conclusion is made about the main sphere of use of wood waste and illiquid wood, which is construction – civil, industrial, agricultural and architectural and aesthetic. The main directions of research are formulated to find ways to dispose of wood waste allowing for more complete use of their specific properties.
Calculation of the reliability of brickwork according to the strength criterion
Authors: Galaeva Natalya
Published: December 2023

In order to change the appearance of buildings or structures during major repairs and reconstruction, hinged ventilated facade systems are often used. To make a decision on the possibility of using a hinged ventilated facade, it is necessary to assess the technical condition of the bearing and enclosing structures of the building or structure in question, including determining their reliability. The article proposes a particular method for calculating the reliability of brickwork by the strength criterion, based on the combined method, for the case when the statistical information obtained as a result of the survey is complete in part of the controlled parameters, and in the other part of the parameters – not complete, since the use of a probabilistic method for calculating reliability will lead to the loss of some useful statistical information, since all parameters are represented as fuzzy variables, and the use of probabilistic statistical methods may lead to incorrect calculation results, since the assumption of the distribution law for the controlled parameters may be erroneous.
Utilizing a value-oriented approach to rationalize design, organizational and technical solutions in construction
Authors: Trebukhin Anatoliy , Kolosov Aleaxander , Kuzmin Konstantin
Published: December 2023

The purpose of this study is to apply the method of value-oriented management to rationalize the choice of design, organizational and technical solutions, taking into account the current market situation. To solve the identified problems, it is proposed to revise the principles of assessing organizational and technical solutions using project management tools, stakeholder theory and the evolutionary theory of values. As a result, the theoretical foundations and methodological recommendations on the economic justification for the choice of organizational and technical solutions in the implementation of an investment and construction project were considered. The theoretical and methodological basis of the research are the works of scientists and specialists devoted to research in the field of theoretical and general methodological problems of assessing the effectiveness of capital investments in construction, as well as the application of a value-oriented approach in the management of investment and construction projects.
Damping vibrations of a hyperbolic cooling tower using a reactive damper
Authors: Shein Alexander , Zemtsova Olga , Chumanov Alexander , Frolov Mikhail
Published: December 2023

Experience in the construction of buildings and structures in areas where there is a threat of earthquakes shows that it is necessary to take seismic protection measures to prevent damage. Vibration dampers are widely used as means of protection. When choosing a vibration damping method, it is necessary to take into account the design features of the building. In this study, the possibility of using a reactive damper to dampen the vibrations of a hyperbolic cooling tower was studied. A numerical experiment was carried out to evaluate the absorber efficiency and select its parameters. An analysis of the results showed that the faster the response time of each charge, the more effective the damping of oscillations. An increase in the reactive force of each charge increases the efficiency up to a certain limit, after which the structure begins to swing in the opposite direction. It was found that the two-sided actuation of charges increases the efficiency of vibration damping.
Mechanisms of development of the material and technical base of the reclamation complex of the Russian Federation
Authors: Zhuravleva Larisa
Published: December 2023

The material and technical base is the basis of the industry’s production processes and requires modernization and renewal. The purpose of the study is to analyze and improve the mechanisms of development of the material and technological base of reclamation complexes based on an innovative approach. The paper defines the patterns and principles of improving the material and technical base of reclamation facilities. An algorithm for planning modernization, replenishment and replacement of the material and technical base, as well as criteria for evaluating efficiency, is proposed.
Expanding functionality of the autonomous voice control system
Authors: Zhigalov Vladimir
Published: December 2023

The article describes the main advantages of voice control systems, notes the shortcomings of the first implemented voice control systems, their functional limitations, and limited use in comparison with modern voice assistants, and also formulates the shortcomings of modern voice control systems. It is noted that with the expansion of functionality, the scope of voice control systems is expanding significantly. The recommendations of leading companies that implement voice technologies, indicating the need to continue research and development in this area. Due to complex calculations in speech recognition, there is a need to use high-speed computers, which makes it difficult to create compact and autonomous voice control systems that work without an Internet connection. At the same time, the growing need for autonomous voice control systems requires a reduction in computational costs, an increase in the speed of calculations by simplifying the methods and algorithms of these systems, implemented in software and hardware in the form of autonomous electronic devices. Methods are distinguished that allow performing recognition with sufficient reliability, such as hidden Markov models and the method for determining mel-frequency cepstral coefficients. In addition, methods are proposed to reduce computational complexity by reducing the number of similar-sounding words included in the command and the commands themselves, and to increase the speed of calculations, the use of electronic components is proposed in the implementation of computational algorithms and their parts. The operability and the possibility of practical application of ways to expand functionality and reduce computational complexity for autonomous voice control systems have been tested and confirmed experimentally, and some of them correspond to the recommendations of leading companies implementing voice technologies.
Investigation for periodic and almost periodic solutions of first-order ordinary differential equations
Authors: Alferov G. , Ivanov G. , Korolev V.
Published: December 2023

Approaches to estimating for the number of periodic and almost periodic solutions of ordinary differential equations are considered. Conditions that allow determinating both the upper and lower bounds for these solutions are found. The existence of periodic and almost periodic solutions in problems are considered. Approaches to estimating for the number of periodic solutions of ordinary differential equations are considered. Conditions that allow determinating both the upper and lower bounds for these solutions are found. The existence and stability of almost periodic problems are considered.
On the geometry of Hamiltonian vector fields
Authors: Narmanov Abdigappar , Diyarov Bekzod
Published: December 2023

It is known that vector fields play an important role in many areas of mathematics and technology, in particular, in the theory of dynamical systems. Hamiltonian dynamical systems are generated by Hamiltonian vector fields. The paper studies the geometry of a singular foliation of a four-dimensional Euclidean space generated by the orbits of two Hamiltonian vector fields. It is proved that the regular leaf of this foliation is a surface of positive normal curvature and nonzero normal torsion.
Development of the principles of parallelization of the symmetric AES encryption algorithm
Authors: Belashova Elena , Iakovlev Igor , Guzanov Roman
Published: December 2023

This article delves into the potential of modern computational systems and technological advancements in refining encryption algorithms, with a particular focus on the Advanced Encryption Standard. The paper underscores the significance of understanding the intricate mechanics and primary processing stages of AES to harness its full potential for parallelization and acceleration. The research emphasizes the pivotal role of Graphics Processing Units in this optimization journey. Given their multi-threaded architecture, GPUs, when integrated with state-of-the-art parallel computing platforms like CUDA and OpenCL, can process vast data volumes with heightened efficiency. This integration not only speeds up the encryption process but also enhances its robustness. The article concludes with a forward-looking perspective, anticipating a deeper convergence between the realms of cryptography and parallel computing. Such a fusion is projected to usher in revolutionary enhancements in both the security and performance facets of encryption systems.
Hardening the rolling surface of the wheels bandage after mechanical treatment
Authors: Fayzibaev Sherzod , Soboleva Irina , Nigay Rodion , Raxmiddinov Izzatillo
Published: December 2023

Article describes calculated argumentation of the striker sealing surface, in the form of the two cylinders with parallel axes model of loading, having an effect on the rim surface of the wheel pairs of rolling-stock. There has been presented a calculation variant of the depth of hard running surfacing of the rolling-stock wheel pairs. Installation of deep hardening of rolling surfaces of wheel sets allows the special striker to create certain forces on the rolling surface of the wheel rim, to deform the surface layer to a certain depth, thereby increasing the hardness of the deformed surface. The article presents the technology for hardening the wheel running surface by loading the surface of the wheel set bandage, by means of the deep hardening installation with the creation of strain stress in the surface layers for several combinations of tensile strength σB and velocity σT of various bandage materials.
Research of bimetallic cutting tools and development of production technology
Authors: Norkhudjayev Fayzulla , Mukhamedov Azad , Abdullaeva Rikhsiyaxon , Igamberdiyev Bakhodir
Published: December 2023

This article presents studies related to the development of the technology of obtaining bimetallic plates for obtaining external grooves by the model gas-spinning casting method. In the scientific work, the mechanism of formation of the joining of the bimetallic composition consisting of XVCG steel and 40XL steel was investigated, consequently, partial melting of the deposit is observed, as a result of the interaction of the liquid metal with the constituent deposit (insert) of the bimetallic composition, and as a result, a single joint occurs in the intermediate zone characterized by its composition and structure between the steel and the components of the compound.
Trends in the implementation of non-assured structural mechanisms in technological machines modules
Authors: Isakov V.S. , Deriglazov V.S. , Ereisky A.V.
Published: December 2023

The results of the analysis of scientific research in the field of non-assure mechanisms are presented, on the basis of which the conclusion is made about the need for further development of the theory of mechanism structures and methodological approaches to the synthesis of machines with special properties of kinematic structure, allowing to reduce energy consumption and improve technical performance. The results of experimental studies have confirmed the existence of a relationship between the magnitude of the pre-voltage of the closed kinematic circuit and the energy intensity of the grinding and pressing process. The revealed patterns make it possible to minimize energy consumption and adapt the technological machine to the properties of the processed material. Experimental studies of a gear-grinding mill on sandstone, quartz, marble samples have confirmed that with the same energy consumption, the maximum grinding efficiency (an increase in the proportion of fine particles) is achieved only in a certain loading range of a closed kinematic contour corresponding to the strength of the crushed material.
A vibration treatment of holes obtained by selective laser melting
Authors: Zlobin E.P. , Khaimovich A.I. , Balaykin A.V.
Published: December 2023

The article investigated the vibration treatment of blind holes obtained by selective laser melting. The object of the investigation was a printed stainless steel specimen with holes of various diameters. The experimental results showed that the most effective treatment occurs when the hole diameter exceeds the size of the abrasive body by 1-2 mm, but does not exceed it by 2 times. It was also noted that the rounding of the edge of the hole with a size not exceeding the nominal value of the abrasive occurs faster than that of a hole with a larger size. The time of rough processing of stainless steel products should not exceed 4 hours, while the most effective processing occurs in the first 2-3 hours. The results obtained allow us to give recommendations on the processing of printed parts with blind holes made by selective laser melting.
Modeling of forces perceived by a wagon when rolling down the hill
Authors: Ortiqov Mironshox , Adilov Nodir , Juraeva Diyora , Kamilov Khasan , Dehkonov Mirali
Published: December 2023

The article presents the results of the construction of computational models and the derivation of analytical formulas describing all active and reactive forces acting and appearing when a single car rolls down a sorting slide.
Development of control system for robotic apple harvesting device
Authors: Pupin Daniil , Chilikin Andrey
Published: December 2023

This article focuses on the control system of a robotic device designed for efficient apple harvesting with minimal fruit damage. The developed device is equipped with specialized mechanisms and sensors aimed at reducing negative impacts on fruits during harvesting. A control system for the robotic device was developed, incorporating various sensors and modules. A module for determining the position of the grip arms was designed, consisting of a polymeric magnetic strip attached to a spiral-shaped cutout. A module to track the position of the grip arms was also developed, capable of indicating the current position of the grip arms, fully open and closed grip, as well as intermediate values. A module to monitor the grip force was designed, used to control the gripping force applied to the fruit. A current sensor was connected to the winding of the linear actuator motor to measure the force. Increasing the force applied by the grip arms to the fruit results in higher current flowing through the linear actuator motor winding. By reading the current sensor data, the degree of compression on the fruit is determined. During testing of the control system modules and sensors, it was found that the grip arm angle position module has the highest sensitivity in the range of 0 to 90 degrees. The obtained data after calibration enable the control of the degree of grip arm opening. The grip arm position module allowed controlling and adjusting the grip arm position with an accuracy of up to 2 mm. A control system for a robotic grip for apple harvesting was developed. Various modules contributing to efficient apple harvesting were designed. One of the key modules is the grip force control module, which regulates the degree of fruit compression during robotic fruit harvesting, thus minimizing fruit damage.
Towards the substantiation of methods for optimizing the transportation work of locomotives under railway operating conditions
Authors: Ablyalimov O.
Published: December 2023

An analysis of existing methods for optimizing the transportation work of locomotives in operation is presented, based on a refined formulation and criteria for the problem of optimal control of train movement by locomotives of different types of traction. The advantage of the dynamic step-by-step programming method proposed by the author, based on the principle of parametric optimization, is substantiated, which makes it possible to calculate optimal train driving modes in areas of locomotive circulation and locomotive crew work with savings in natural diesel fuel consumption of up to eight to ten percent per trip. The analytical dependence of the stepwise optimization of the process, which determines the sequence of solving the optimization problem, is recommended to be used in the development of optimized train driving modes maps on sections of the Uzbek railways of varying difficulty.
Event reconstruction in ACTAR TPC: Adaptation for transfer experiments
Authors: Lozano-González Miguel , Fernández-Domínguez Beatriz , Lois-Fuentes Juan , Roger Thomas
Published: December 2023

Preliminary results of the performance of the RANSAC algorithm over data measured with the ACTAR TPC detector are herewith presented. With the aim of improving track reconstruction in highly contaminated events, an initial assessment of the algorithm is given for elastic reactions involving p, d with a beam of 20O. Results show great possibilities for data/noise discrimination, which in the near future will be extended to small angle and more energetic events, which are key for transfer reactions.
A walk along the proton drip-line by β-decay spectroscopy
Authors: Orrigo Sonja E.A. , Rubio Berta , Gelletly William
Published: December 2023

During the last decade we have carried out a systematic study of the β decay of neutron-deficient nuclei, providing rich spectroscopic information of importance for both nuclear structure and nuclear astrophysics. We present an overview of the most relevant achievements, including the discovery of a new exotic decay mode in the fp-shell, the β-delayed γ-proton decay in 56Zn, the first observation of the 2+ isomer in 52Co and the latest results on the heavier systems 60Ge and 62Ge. We also report on our deduced mass excesses in comparison with systematics and a recent measurement. Finally, we summarise our results on the half-lives of Tz = -1/2, -1 and -2 neutron-deficient nuclides, and analyse their trend.
Fission hindrances in transfermium nuclei
Authors: Lopez-Martens A. , Hauschild K. , Svirikhin A.I. , Asfari Z. , Chelnokov M.L , Chepigin V.I. , Dorvaux O. , Forge M. , Gall B. , Isaev A.V. , Izosimov I.N. , Kessaci K. , Kuznetsova A.A. , Malyshev O.N. , Mukhin R.S. , Popeko A.G. , Popov Yu.A. , Sailaubekov B. , Sokol E.A. , Tezekbayeva M.S. , Yeremin A.V.
Published: December 2023

Very heavy nuclei owe their stability against spontaneous fission to quantum shell effects, which depend on the local density of single-particle states. The height but also the width and the structure of the barrier in multi-dimensional deformation space determine the fission half-lives. Other effects come into play, such as the conservation of quantum numbers and superfluidity or stiffness of the system in the fission process. This is why odd nuclei have longer fission partial half-lives with respect to their even neighbours and also why multi-quasi-particle states, such as high-K states, are thought to be more stable against fission than the ground state. We will report here on two different fission studies carried out with the GABRIELA detector array at the focal plane of the recoil separator SHELS. The first study concerns the fission properties of 253Rf, the most neutron deficient Rf isotope known to date. The second study focusses on a new measurement of the fission hindrance of the known 8- isomer in 254No.
Multiplicity-dependent production of heavy mesons with strangeness in small systems at LHCb
Authors: Landesa Gómez Clara
Published: December 2023

The phenomenon of strangeness enhancement, originally proposed as a signature of quark-gluon plasma formation, has received considerable new interest following recent observations in small collision systems. LHCb is uniquely well suited to study such effects in the heavy quark sector, down to very low transverse momentum. Here we will present new LHCb results on the production rates of B0s relative to B0 mesons versus multiplicity in pp collisions. Potential implications for the hadronization mechanism of heavy quarks and our understanding of the factorization of fragmentation functions will be discussed.
NP effects in Λb → Λc(*) semileptonic decays
Authors: Penalva Neus , Hernández Eliecer , Nieves Juan
Published: December 2023

In the context of lepton flavor universality violation (LFUV) studies, we study different observables related to the b → cτν¯τ semileptonic decays. These observables are expected to help in distinguishing between different New Physics (NP) scenarios. Since the τ lepton is very short-lived, we consider three subsequent τ-decay modes, two hadronic πντ and ρντ and one leptonic µν¯µντ. This approach enables the differential decay width to be written in terms of visible (experimentally accessible) variables of the massive particle created in the τ decay. We present numerical results for the observables that can be accessed through the visible kinematics for the Λb → Λc and the Λb → Λ˚c p2595q transitions. This work is based on Refs.[1–3].
Electric dipole moment of charged particles using storage rings
Authors: Shmakova Vera ,   for the JEDI collaboration
Published: December 2023

The Standard Model (SM) of Particle Physics cannot explain the matter-antimatter asymmetry in the Universe. Especially, new sources of CP-violation are necessary, and this is why physics beyond the SM is being explored. The search for permanent Electric Dipole Moments (EDMs) of elementary particles has the potential to provide a powerful tool to discover new sources of CP-violation. Finding an EDM would be a convincing indication for physics beyond the SM. Moreover, a rotating polarized beam used in EDM searches is sensitive to oscillating EDM caused by axions or axion-like particles (ALPs), the candidates for the dark matter. Storage rings are promising devices to measure EDMs of charged particles by observing the effect of the EDM on the spin motion in the ring. The Cooler Synchrotron COSY at the Forschungszentrum Jülich provides polarized protons and deuterons with momenta up to 3.7 GeV/c and it constitutes an suitable testing ground and starting point for an experimental program to search for EDMs of charged particles. This report provides an overview of the current status of the JEDI project for the first direct measurement of the deuteron EDM at COSY. The analysis is currently ongoing. Due to the complexity of storage rings, this study combines high precision measurements and thorough understanding of the systematic uncertainties involved.
Nuclear fragmentation cross section measurements with the FOOT experiment
Authors: Ridolfi Riccardo
Published: December 2023

Different fields can profit by nuclear fragmentation cross section measurements: among them hadrontherapy and space radioprotection are of particular interest. Hadrontherapy employs high-energy beams of charged particles (protons and heavier ions) to treat deep-seated tumours. In these treatments nuclear interactions have to be considered: beam particles can fragment in the human body releasing a non-zero dose beyond the tumour while fragments of human body nuclei can modify the dose released in healthy tissues.

On the radioprotection side, the interest in long-term manned space missions beyond Low Earth Orbit is growing in these years but it has to cope with significant health concerns from radiation in space, necessitating an accurate cross section data description. The FOOT (FragmentatiOn Of Target) experiment was proposed to cover these gaps in data. It was designed to detect, track and identify nuclear fragments and aims to measure double differential cross sections both in angle and kinetic energy which is the most complete information to address existing questions. The FOOT experimental setups, the experimental program and a first cross section analysis of 400 MeV/u 16O beam on Carbon target data acquired in July 2021 at GSI (Darmstadt, Germany) will be presented.
Impact of core excitations in break-up reactions with halo nuclei
Authors: Lay J.A. , Punta P. , Moro A.M.
Published: December 2023

We revisit the resonant break-up of 19C on protons at intermediate energies. In this reaction, it was found, for the first time in a halo nucleus to our knowledge, that the cross section was largely dominated by the excitation of the core. In this contribution, we study the robustness of this conclusion against the choice of different optical potentials for the core.
Dineutron correlations in knockout reactions with Borromean halo nuclei
Authors: Casal Jesús , Gómez-Ramos Mario , Moro Antonio M.
Published: December 2023

We study dineutron correlations in proton-target knockout reactions induced by Borromean two-neutron halo nuclei. Using a core + n + n three-body model for the projectile and a quasifree sudden reaction framework, we focus on the correlation angle as a function of the intrinsic neutron momentum. Our results indicate that the correlations are strong in a range of neutron momenta associated to the nuclear surface. We also discuss on the role of core excitations for such correlations.
Study of light hypernuclei in Europe: The hypertriton and nnΛ puzzles
Authors: Rappold C. , Achenbach P. , Alibrahim Alfaki H. , Amjad F. , Armstrong M. , Behr K.-H. , Benlliure J. , Brencic Z. , Dickel T. , Drozd V. , Dubey S. , Ekawa H. , Escrig S. , Feijoo-Fontan M. , Fujioka H. , Gao Y. , Geissel H. , Goldenbaum F. , Graña Gonzalez A. , Haettner E. , Harakeh M. N. , He Y. , Heggen H. , Hornung C. , Hubbard N. , Itahashi K. , Iwasaki M. , Kalantar-Nayestanaki N. , Kasagi A. , Kavatsyuk M. , Kazantseva E. , Khreptak A. , Kindler B. , Knoebel R. , Kollmus H. , Kostyleva D. , Kraft-Bermuth S. , Kurz N. , Liu E. , Lommel B. , Metag V. , Minami S. , Morrissey D.J. , Moskal P. , Mukha I. , Muneem A. , Nakagawa M. , Nakazawa K. , Nociforo C. , Ong H.J. , Pietri S. , Pochodzalla J. , Purushothaman S. , Rocco E. , Rodríguez-Sánchez J.L. , Roy P. , Ruber R. , Saito T.R. , Schadmand S. , Scheidenberger C. , Schwarz P. , Sekiya R. , Serdyuk V. , Skurzok M. , Streicher B. , Suzuki K. , Szczepanczyk B. , Tanaka Y. K. , Tang X. , Tortorelli N. , Vencelj M. , Wang H. , Weber T. , Weick H. , Will M. , Wimmer K. , Yamamoto A. , Yanai A. , Yoshida J. , Zhao J. ,   WASA-FRS/Super-FRS Experiment Collaboration
Published: December 2023

The current understanding of light hypernuclei, which are sub-atomic nuclei with strangeness, is being challenged and studied in detail by several European research groups and collaborations. In recent years, studies of hypernuclei using high-energy heavy ion beams have reported unexpected results on the three-body hypernuclear state 3ΛH, named the hypertriton. For some time, reports of a shorter lifetime and larger binding energy than what was previously accepted have created a puzzling situation for its theoretical description; this is known as the "hypertriton puzzle". With the inclusion of the most recent experimental measurements, the current status of the hypertriton puzzle is evolving. Additionally, the possible neutral bound state of a Λ hyperon with two neutrons, nnΛ, has raised questions about our understanding of the formation of light hypernuclei either in bound or resonance states. These results have initiated several ongoing experimental programs all over the world to study these three-body hypernuclear states precisely. We are studying these light hypernuclear states by employing heavy ion beams at 2AGeV on a fixed carbon target with the WASA detector system and the Fragment Separator (FRS) at GSI. The WASA-FRS experimental campaign was performed during the first quarter of 2022, and this paper presents a short overview of the campaign and how it seeks to tackle the hypertriton and nnΛ puzzles. Data analysis is ongoing, and several preliminary results will be reported.
Low-lying structure of 15C: Information on the N=8 shell gap
Authors: Lois-Fuentes J. , Fernández-Domínguez B. , Pereira-López X. , Delaunay F. , Catford W.N. , Matta A. , Orr N.A. , Duguet T. , Otsuka T. , Somà V. , Sorlin O. , Suzuki T. , Achouri N.L. , Assié M. , Bailey S. , Bastin B. , Blumenfeld Y. , Borcea R. , Caamaño M. , Caceres L. , Clément E. , Corsi A. , Curtis N. , Deshayes Q. , Farget F. , Fisichella M. , de France G. , Franchoo S. , Freer M. , Gibelin J. , Gillibert A. , Grinyer G. F. , Hammache F. , Kamalou O. , Knapton A. , Kokalova Tz. , Lapoux V. , Le Crom B. , Leblond S. , Marqués F.M. , Morfouace P. , Pancin J. , Perrot L. , Piot J. , Pollacco E. , Ramos D. , Regueira-Castro D. , Rodríguez-Tajes C. , Roger T. , Rotaru F. , Sénoville M. , de Séréville N. , Smith R. , Stanoiu M. , Stefan I. , Stodel C. , Suzuki D. , Thomas J.C. , Timofeyuk N. , Vandebrouck M. , Walshe J. , Wheldon C.
Published: December 2023

The low-lying structure of 15C has been investigated via the neutron-removal d(16C, t) reaction. The experiment was performed at GANIL using a secondary 16C beam produced by fragmentation in the LISE spectrometer at 17.2 MeV/nucleon with an intensity of 5 × 104 pps and 100% purity. The angle and energy of the light ejectile were detected by three MUST2 telescopes. The missing mass technique was used to reconstruct the excitation energy of 15C. In this spectrum, two bound states were observed (gs and the first excited state) and two unbound resonant states above the neutron separation threshold (S n = 1.218 MeV). From the differential cross sections, information on the angular momentum of the transferred nucleon and spectroscopic factors were deduced.

The excitation energies and the deduced spectroscopic factors of the negative parity states placed above the neutron separation energy are an important measurement of the 2p-1h configurations in 15C. Our results show good agreement with shell-model calculations with the YSOX interaction and show a sensitivity to the N=8 shell gap.
Constraints on the nuclear Equation of State from heavy ion reaction dynamics
Authors: Colonna Maria
Published: December 2023

Heavy ion collisions allow one to create and explore, in laboratory experiments, transient states of nuclear matter under several conditions of density, temperature and charge asymmetry. The complex manybody dynamics is suitably described by transport theories which employ effective interactions, thus connecting fundamental nuclear ingredients to sensitive observables of experimental interest. We review here recent analyses which allow to constrain, in particular, the controversial density behavior of the symmetry energy of the nuclear Equation of State, also outlining future perspectives.
Study on the meshing theory of the ring-shaped roller screw mechanism
Authors: FU Xiaojun , LI Xin , MA Shangjun , TONG Ruiting , LIU Geng
Published: December 2023

Based on the structural characteristics of ring-shaped roller screw mechanism (RRSM), helical equations of the screw, roller and nut are derived. Meshing equations at the screw-roller and nut-roller interfaces are developed, which can be used to calculated contact positions of thread teeth. The equations of axial clearances in the RRSM are also derived and zero-clearance design values of the thread thicknesses are given. By comparing the contact positions and clearances obtained from a previously published numerical model, the feasibility of the proposed model is validated. The influence of structural parameters on the meshing characteristics of the RRSM is analyzed. When the nominal radius of the screw is increased or that of the roller is decreased, the contact point at the screw-roller interface will move towards to the tangential-point of pitch circles. The difference between the value of the screw flank angle and that of the screw flank angle has great influence on contact positions. When the values of the nut and roller flank angles are equal, the contact points will lie on the tangential-point of pitch circles and the zero-clearance design value of the thread thickness at the nut-roller interface is equal to the half of the screw pitch. The radius of the roller thread profile has little influence on the zero-clearance design values of thread thickness.
Study on hard rock particle size division based on Mars rover traction performance
Authors: DU Jiangshan , HUANG Rongmin , HUANG Tieqiu
Published: December 2023

To simplify the dynamic solution of the contact between the rigid wheel of Mars rover and the spherical hard stone on the mixed terrain, a model for hard stone particle size division based on the traction performance of Mars rover is proposed. On the mixed terrain of hard rock and soft soil, the movement of hard rock will affect the traction performance of the rigid wheels of Mars rover. According to the different effects of the hard stones on the traction performance of rigid wheels, stones are divided into three types. The static sinkage of rigid wheels is calculated according to the Bekker bearing model, and the calculation formula of sliding sinkage of rigid wheels and hard stone sinkage is proposed. The type of hard stones is determined by comparing the sinkage of hard stones and rigid wheels. Finally, three kinds of hard stones with slip ratios of 0.2, 0.5, and 0.7 were substituted into the single wheel simulation platform and the soil trough experiment platform for simulation and experiment. The results show that on mixed terrain, the error of simulation and experimental results of fixed hard stones under three slip rates is below 5.4%, the error of drawbar pull in simulation and experimental results of movable hard stones is above 126%, and the error of simulation and experimental results of scattered small hard stones is below 2%, which verifies the effectiveness of the hard stone particle size division model.
Large eddy simulation study of the effect of pilot swirler blade angle on the coherent structure in a dual-swirl combustor
Authors: FENG Xiangzhou , SUO Jianqin , LI Qiandong , ZHENG Longxi
Published: December 2023

Large-scale coherent structures in a dual-swirl direct-mix combustor and the effect of the pilot swirler blade angle variations (35°, 40° and 45°) on them are investigated by using the large eddy simulations. The results show that no apparent coherent structure is observed downstream of the main swirler, and four typical helical vortex structures are captured downstream of the pilot swirler, representing the PVC and its three higher harmonic modes, respectively. According to the "decoupling" position from the shear layer, the spiral vortex is divided into two regions in space, the "development zone" and the "dissipation zone", respectively. In the frequency domain, as the pilot swirler blade angle increases, the characteristic frequency of the PVC and its higher harmonic structures first decrease and then increase, the energy contribution of the harmonic mode increase, and the double-helix structure replaces the single-helix structure as the dominant structure in the non-constant flow field. In the space domain, as the pilot swirler blade angle increases, the total length of PVC remains basically constant, the initial radius gradually increases, the expansion angle first increases and then decreases, and the position of "decoupling" between shear layer and spiral vortex gradually advances.
Research on game strategy of underwater attack and defense process in typical situation
Authors: WANG Zhong , WEN Zhiwen , CAI Weijun , WANG Pei
Published: December 2023

Aiming at the problem of underwater attack and defense in typical situations, a mathematical model of three-party attack and defense problem composed of torpedo, submarines and anti-torpedo torpedo is established. Under the condition of considering three-party game confrontation, the three-party game problem is transformed into the pursuit and escape game problem between the submarine and torpedo, and the interception and evasion game problem between the submarine launched ATT and the torpedo. Based on the optimal control theory and differential game theory, the three-party optimal game problem is studied, and the three-party game performance evaluation function is designed based on the optimal performance of the two parties of pursuit and escape and the two parties of interception and evasion. According to the optimal necessary condition of the bilateral extremum, the strategy of pursuing, escaping, blocking and avoiding in the three-party game is deduced. The effectiveness of the game strategy designed in the underwater attack and defense process is verified by simulations. The results show that the game strategy can improve the effects of submarine escape, anti-torpedo torpedo interception and torpedo attack.
Multimedia use and its impact on the effectiveness of educators: a technology acceptance model perspective
Authors: Tang Xuan , Zainal Siti Rohaida Binti Mohamed , Li Quan
Published: December 2023

Amidst the contemporary shifts within early childhood education (ECE) in China, the significance of multimedia tools and their effective deployment by educators is increasingly paramount. Situated within the theoretical underpinnings of the Technology Acceptance Model (TAM), this inquiry elucidates the intricate dynamics between the Perceived Usefulness (PU) and Perceived Ease of Use (PEU) of said tools and their consequential influence on educators’ effectiveness. Empirical data gleaned from a rigorous quantitative survey of 400 educators within ECE institutions in Guangdong Province underscore the importance of PU and PEU as determinants of the successful assimilation of multimedia tools, thereby influencing the pedagogical efficacy of educators. There are several implications of this investigation. The study primarily contributes to the academic discourse by bridging a discernible lacuna and offering insights into multimedia tool adoption dynamics within the specific milieu of ECE in China. The findings have implications for a spectrum of stakeholders, from multimedia tool developers to educational policy-makers, underscoring that tools, to be truly transformative, must be perceived as both intrinsically valuable and user-centric. Notwithstanding the robustness of the findings, the geographically circumscribed focus on Guangdong Province warrants prudence in generalizing insights across China. This suggests the need for future scholarly endeavours to broaden the research purview across diverse provinces, aspiring to provide a more holistic understanding of the dynamics of multimedia tool integration within China’s expansive ECE domain.