bluuebunny/crossref_metadata_2025_split huggingface dataset:
Melnikov chaos, control and synchronization of fractal Josephson junction
Authors: Osseni C O A , Miwadinou C H , Monwanou A V 
Published: July 2023

Abstract
Josephson junctions due to their memory and non-linearity properties have considerably impacted the exact sciences and technological fields in particular. In this study, we investigate the existence criteria of Smale’s horseshoe chaos in a fractal junction by considering the non-harmonic constant of the super current of the junction. After having analytically studied the conditions of existence of this chaos by means of Melnikov’s theorem and verifying its predictions by drawing the basins of attraction, we have analyzed the influence of certain control parameters on the dynamics of the system. The control and synchronization of the system have been carried out for its practical use in electronics in integrated circuits , for example, and in telecommunications for the storage of information and the securing of data. The motivation of this study is to bring out the possible and complete dynamics of a fractal junction by considering the non-harmonic constant of the super current of the junction in order to expand the old research work carried out and to promote a more detailed knowledge of the behaviors of this system.
Topological phase transitions and topological flat bands on the ruby lattice
Authors: Yang Yuan , Shu Chang-Rong , Li Xiao-Bing 
Published: July 2023

Abstract
We investigate the topological properties of a tight-binding model on the two-dimensional ruby lattice in the presence of staggered fluxes. The variation of the nearest- and next-nearest-neighbor hopping parameters yields tunable Chern-number bands, which may host quantum anomalous Hall insulators at different filling fractions. Interestingly, we obtain topological nontrivial bands with high Chern number C = −4. We show that topological phase transitions among different gapped phases are accompanied with the gap closing and reopening processes. Furthermore, we find topological flat bands with Chern number C=+1, which could be a platform for realizing a fractional quantum Hall effect.
Predictions of the ratio and asymmetry probes of the invisible Z-boson decay
Authors: Saygin Kadir 
Published: July 2023

Abstract
Higher-order predictions through the combined accuracy including next-to-leading order (NLO) electroweak (EW) and next-to-NLO (NNLO) quantum chromodynamics (QCD) corrections in underlying perturbation theories are presented thoroughly for the invisible decay of the Z boson into neutrino pair relative to its decay into charged-lepton pair (leptonic decay). The combined NNLO QCD+NLO EW predictions are achieved based on the fully-differential calculations of cross sections of both the invisible and leptonic processes in proton-proton (pp) collisions at 13 TeV center-of-mass energy. Differential distributions of cross-section ratios of the invisible process to the leptonic process are presented as a function of the transverse momentum of the Z boson

p

T

Z

. For the first time, the predictions for differential distributions of cross-section asymmetries between the invisible process and the leptonic process are presented in bins of the

p

T

Z

. The cross-section ratio and asymmetry distributions, which are referred to as the invisible probes, are considered to be important for controlling the invisible process by the leptonic process of the Z boson and probing deviation from the Standard Model (SM) for new-physics searches. The predictions are extensively presented beyond the Z-boson mass resonance region to assess the potential of the invisible ratio and asymmetry probes for new-phenomena searches in high-invariant mass region of the lepton-pair final states. Various tests with threshold requirements of transverse momenta of neutrino pair and leptons are performed to assess the impact on the combined predictions. The invisible ratio and asymmetry probes are proposed to be important probes for indirect searches of new-physics scenarios.
Re-examination of β-decay in Hg, Pb and Po Isotopes
Authors: Nabi Jameel-Un , Bayram Tuncay , Riaz Muhammad , Ullah Asim , Hayder Anes , Şenturk Şevki , Böyükata Mahmut 
Published: July 2023

Abstract
This study re-examines the effect of nuclear deformation on the calculated Gamow-Teller (GT) strength distributions of neutron-deficient (178−192Hg, 185−194Pb and 196−206Po) nuclei. The nuclear ground state properties and shape parameters were calculated using the Relativistic Mean Field model. Three different density-dependent interactions (D3C, DD-ME2 and DD-PC1) were used in the calculation. Estimated shape parameters were later used within the framework of deformed proton-neutron quasi-random phase approximations model, with a separable interaction, to calculate the GT strength distributions, half-lives and branching ratios for these neutron–deficient isotopes. It was concluded that half-lives and GT strength distributions vary considerably with change in shape parameter.
Convenient quantum controlled teleportation of two-qubit pure state with seven-qubit entangled state
Authors: Ma Yun 
Published: July 2023

Abstract
Based on a seven-qubit entangled state, Chen et al (2020 Int. J. Theor. Phys.
59 1402) presented a scheme for controlled quantum teleportation. Using the same quantum channel state, we put forward a new scheme in which the quantum information sender can also transmit a Bell state to receiver under the agreement and assist of the controller. The comparison with Chen et al’s scheme is made and reveals its distinct advantage of reducing the classical resource consumption and increasing the intrinsic efficiency as well as degrading the complexity of necessary operations.
Electromagnetic pulses with non-zero electric area in transition radiation
Authors: Rosanov N N 
Published: July 2023

Abstract
An analysis was made of the electric area—the time integral of the electric field strength—of pulses that occur during transition radiation when charged particles cross the interface between two media with different electromagnetic characteristics. Exact expressions are obtained for the longitudinal and transverse (radial) components of the electric area, which determines, in the case of extremely short pulses, the effectiveness of their impact on micro-objects.
Phase-stepping interferometry for parallelism measurement of step gauge faces
Authors: Sharma Sucheta , Nysten Johan , Lassila Antti , Ikonen Erkki 
Published: July 2023

Abstract
The article presents a measurement method driven with a non-contact optical system consisting of a mirror array by employing phase stepping interferometry to determine the surface parallelism of step gauge faces. The array houses a prism mirror to allow simultaneous interferometric measurement of two opposite step gauge faces relative to the front surface. Mechanical movement of the mirror array is detected using an alignment monitoring mirror to compensate the tilt angle of the system. The front surface of the step gauge and the alignment mirror, located at the measurement arm of the interferometer, are adjusted normal to the collimated laser beam of 50 mm diameter. Phase stepping is performed by a piezo controlled mirror at the reference arm. A theoretical approach is described to verify the experimentally obtained sensitivities of the system due to yaw and pitch misalignments of the mirror array and the step gauge. The technique offers improved measurement accuracy to measure the parallelism of the step gauge faces. Main uncertainty components are caused by the plane fitting analysis of non-ideal surfaces and repeatability of the results. The combined standard uncertainty of parallelism measurement is 18 µrad.
High-density magnetomyography is superior to high-density surface electromyography for motor unit decomposition: a simulation study
Authors: Klotz Thomas , Lehmann Lena , Negro Francesco , Röhrle Oliver 
Published: July 2023

Abstract

Objective. Studying motor units is essential for understanding motor control, the detection of neuromuscular disorders and the control of human–machine interfaces. Individual motor unit firings are currently identified in vivo by decomposing electromyographic (EMG) signals. Due to our body’s properties and anatomy, individual motor units can only be separated to a limited extent with surface EMG. Unlike electrical signals, magnetic fields do not interact with human tissues. This physical property and the emerging technology of quantum sensors make magnetomyography (MMG) a highly promising methodology. However, the full potential of MMG to study neuromuscular physiology has not yet been explored. Approach. In this work, we perform in silico trials that combine a biophysical model of EMG and MMG with state-of-the-art algorithms for the decomposition of motor units. This allows the prediction of an upper-bound for the motor unit decomposition accuracy. Main results. It is shown that non-invasive high-density MMG data is superior over comparable high-density surface EMG data for the robust identification of the discharge patterns of individual motor units. Decomposing MMG instead of EMG increased the number of identifiable motor units by 76%. Notably, MMG exhibits a less pronounced bias to detect superficial motor units. Significance. The presented simulations provide insights into methods to study the neuromuscular system non-invasively and in vivo that would not be easily feasible by other means. Hence, this study provides guidance for the development of novel biomedical technologies.
Research and development of copper joint for ITER In-Vessel Coils
Authors: Hao Qiangwang , Jin Jing , Wang Hua , Liu Xiaochuan , Tao Bowei , Wu Yu , Vostner Alexander , Laquiere Julien , Claudio Fichera 
Published: July 2023

Abstract
The ITER In-Vessel Coils (IVCs) are crucial components of the Tokamak fusion reactor. They are located within the vacuum vessel (VV) behind the blanket shield modules and are responsible for compensating for fast perturbations of the plasma. There are a total of 176 joints used to connect the IVCs, feeders and feedthrough. The joint structure consists of a central copper conductor, a mineral (MgO) insulation layer, and an outer stainless-steel jacket. Given the inaccessibility of the IVCs once the blanket modules are installed, the highest level of quality is required for the joints. One key item is the welding of the copper conductor which has to be done inside the VV. To address the high thermal conductivity of copper conductor and the challenging constraints working inside the VV, a preheating method by the arc of the welding head has been developed. Macro- and micro-structure examination were performed on the welding cross sections, and tensile tests were carried out to check the strength of the copper joint, which demonstrated that arc preheating does not have a significant impact on the heat-affected zone. After more than 40 welding attempts and several design updates, the copper joint has been successfully developed and can be repeatedly and successfully welded.
A model of sustainable information security management system in higher education institutions
Authors: Sikman Lj , Latinovic T , Sarajlic N , Sikanjic G 
Published: July 2023

Abstract
Modern business systems have the expectations and requirements of users and stakeholders for safer and better services that are constantly growing. The increasing use of information technology in business increases the threats and vulnerabilities to which information resources are exposed, which causes an increase in information risks. Many business institutions must constantly monitor their activities to establish an organized and sustainable information security management system and services. The requirements of the international standard ISO/IEC 27001 and the generally accepted COBIT management framework are important for the application of such a system. The paper presents a model of a sustainable information security management system (ISMS) at universities.
Computing the value of uneven raising of building consisting of nine segments deflected from vertical due to mining exploitation
Authors: Gromysz K , Orwat J 
Published: July 2023

Abstract
Deflection of buildings from vertical is a common damage caused by underground mining. Its removal consists in tearing the building apart at the level of one of the storeys, most often in the basement, and then unevenly lifting a part of the building above the tearing plane with the use of piston hydraulic jacks. One of the conditions for a properly carried out rectification is the correct computing of the height of lifting the individual corners of the building. The subject of the article is the deflected from vertical building of large projection (64.0 m × 41.9 m). The building consists of nine dilated segments, which are functionally related. The width of expansion joints between segments is about 10 cm. The deflection from vertical of the building occurred as a result of deformation of the mining area. Due to the significant projection of the building, the deflection of each segment is not the same. It was decided that deflection of the building would be removed by uneven raising of the structure with jacks mounted in the walls. The method of computing the value of uneven raising of the building is presented. In the first step the deflection of each segment was identified. Than the segments were divided into groups, due to their functional solutions. Then, for each group, the average deflection was determined. On the basis of this deflection, the values of uneven raising of each segment were determined. Described procedure made it possible to minimize the number of steps that will appear between the segments. Thanks to this, the building will regain functionality after carrying out the planned renovation.
Energy efficiency of the Process Planning Design in the scope of Industry 4.0
Authors: Borojević S , Sredanović B , Milošević M , Sekulić M , Janković S 
Published: July 2023

Abstract
In this paper we present an experimental investigation in the scope of Industry 4.0 that provide an answer to the question of whether and to what extent operation sequencing during machining affects the output parameters of process planning design: main production time (MPT) and total energy consumption (TEC). Main production time is the basic indicator of productivity, while total energy consumption is an indicator of energy efficiency of the process. After experimental research, a relation was established between the variants of operation sequencing during machning, on the one hand, and main production time and total energy consumption, on the other hand.
Pressure and flow control loop for serial and parallel hydraulic systems powered by the frequency converters
Authors: Klincov Z , Knezevic B Z , Erceg D , Grahovac Z 
Published: July 2023

Abstract
Frequency converters are electronic devices used in automated processes to control the speed of an electric motor. The aim of this paper is to prove that frequency converters can replace PLCs in smaller automated hydraulic systems. For the realization of this research, an experimental setup was used, which consists of two separate systems, and each system consists of: pump, frequency converter, command table, pressure and flow sensors. Using manual valves, it is possible to connect two systems into one, serial or parallel, in order to achieve higher value of pressure or flow, respectively. The first part of the paper describes the experimental setup as well as hydraulic and control scheme. After that, the used procedure of setting the parameters of the PI controllers was described. Programming and settings of parameters was performed for cases when the systems are connected in series and in parallel, and in both control cases only one control loop was used, which was implemented in only one frequency converter, while the second frequency converter was controlled by a loop signal from the first converter. The methods used to adjust the parameters of the PI controller proved to be correct and precise and reliable pressure and flow control was achieved for the cases of serial and parallel system, respectively. The pumps run at the same speeds and because of that they are able to achieve the same pressure or flow values in the system at any time. At the end, the measurement results were presented.
Design and optimization study of a resistance structure for an industrial storage platform supporting injection molding tools for the automotive industry
Authors: Alic D D , Pinca Bretotean C 
Published: July 2023

Abstract
The paper offers an optimized solution for an industrial storage platform supporting injection molding tools used to produce thermoplastic components in the automotive sector. After analyzing the current situation for storing the massive tools, a work platform was proposed in order to ensure the conditions imposed by the extension of the company’s implementation of LEAN methods to streamline the production flow. The design of the resistance structure was modeled in the program Autodesk Inventor Professional 2020, taking into account realistic loads and their statistical distribution in the construction of the static and loading scheme of the main beam. The analysis of stress and strain in the main beam under the action of external loads was performed using the finite element method of the program Autodesk Inventor Nastran. The optimized solution for the main beam has been found by analyzing the optimization possibilities in three steps: structural optimization, dimensional optimization and the validation of the proposed optimization options, by verifying the safety of the structure. This paper presents in detail the choice of optimization criteria, decision variables, constraints and objective function. Based on the numerical analysis of mechanical stress and safety coefficient in operation, an optimal variant was chosen from the analyzed models: recessed articulated structure simple and with intermediate support, using laminated profiles IPE 200 and IPE 140.
Investigation of dynamic behaviour of one complex steel structure
Authors: Golubovic-Bugarski V , Sredanović B , Milovanović S , Vukomanović R , Petković S , Todić M 
Published: July 2023

Abstract
This paper deals with dynamic analysis of a steel structure, constructed by steel beams and pillars which are connected by bolts. This structure is designed to serve as an acoustic barrier to one rotating machine which generates an air borne and structure borne sound and vibrations on a certain frequencies. This excitation energy is transmitted to the steel structure and might cause the oscillations of the structure. Depending on the frequency of the source of excitation, oscillations of the structure may occur at one of its natural frequencies, which depends on the physical characteristics of the structure - shape, dimensions, materials, grounding conditions, as well as other structural parameters. If it happens that excitation frequencies and the natural frequencies of the structure coincide to each other, a resonant oscillation of the structure will occur. To avoid the resonant oscillation of the structure, it is necessary the structure be designed such a way that its natural frequencies are not in the operating frequency range of the source of vibration. The investigated steel structure is subjected to mass and stiffness changes due to inserting some additional elements. The change of these physical characteristics of the structure can lead to change of its natural frequencies. To investigate dynamic behaviour of overall structure, a numerical model was set by FEM analysis and experimental analysis was done using modal test and bump test.
Deformation state of the load-bearing structure of a four-column the press
Authors: Todic M , Golubović-Bugarski V , Merdanić M , Latinović T 
Published: July 2023

Abstract
During the operation of each machine, the deformation and stress state of its supporting structure is directly related to the load. The load intensity ranges from the minimum to the maximum value and is a function of nominal force, torque, and kinematic-dynamic values of moving and executive assemblies during the machine operation process. The intensity of deformations is also a function of the shape and type of the supporting structure. However, although the supporting structure is reliable, which refers to its integrity, the production of a quality workpiece (product) does not have to be reliable. Therefore, it is important that the deformation states of the supporting structure be in the appropriate tolerance field, regardless of the intensity of the load. If the intensity of deformations is outside a certain field, it will directly affect the quality of the workpiece that is made on the subject machine. It is known that load-bearing structures can be of open and closed types, load-bearing structures of closed type are used for higher loads and larger workpiece dimensions. By installing sensors on the elements of the supporting structure with accompanying measuring chains in real-time, the deformation state of certain elements or places on the supporting structure can be monitored, based on which the reliable quality of the workpiece can be influenced.
Management of the process of moulding-casting a steel part in order to optimize it
Authors: Josan A , Pinca-Bretotean C , Ardelean E , Ardelean M 
Published: July 2023

Abstract
The foundry industry occupies an important position in the manufacture of castings, both through the existing production capacities and through the remarkable achievements registered in various fields and industries. The goal of steel foundry industry leaders is to meet the demands of both the entire market and individual customers, to develop new products, to improve available technologies, and to implement new “green” projects while optimizing all processes in the foundry. In this context, this paper presents the possibility of optimizing the process of moulding-casting a steel part that can be used in various industries (mechanics, machine building, mining etc.). The non-conformities of the current moulding-casting technology are identified and actions are proposed to remove them. By applying changes in technology, the rejects registered in the industrial practice is significantly reduced, the quality of the production process is improved, which is reflected in the costs of the enterprise.
Sustainable development indicators in the steel industry
Authors: Fărcean I , Proştean G , Socalici A 
Published: July 2023

Abstract
The sustainability indicators of the steel industry, developed by World Steel, measure the performance of sustainability in the social, economic, and environmental fields. They provide a wide perspective on the effects of steel plants. The activity of measuring and monitoring indicators makes significant contributions to the process of implementing and increasing sustainability in the steel sector. Most steel companies voluntarily provide sustainability data, including CO2 emissions and the frequency of accidents over time. The article presents an analysis of the indicators of steel companies, based on data provided by the World Steel Association. Particular attention was paid to the pandemic period, the period that had a different influence on the indicators analyzed.