bluuebunny/crossref_metadata_2025_split huggingface dataset:
The impact of utilizing UHPFRC in beam-column joints with different patterns of transverse reinforcement
Authors: Abdo Ayman , Mohamed Heba A. , Ryad Talaat , Ahmed Sayed 
Published: April 2023

This research studies and assesses the possibility of employing UHPFRC in exterior beam-column joints (BCJs). Eight specimens with various concrete material characteristics and steel reinforcing details are cast and examined under repeated loads. Normal concrete with seismic reinforcing details is used as a control specimen. For certain specimens, UHPC, UHPFRC with 1% steel fiber, and UHPFRC with 2% steel fiber are poured into all BCJs, and others are poured into the critical zone only. The consequences of removing stirrups from the joint were studied. All specimens' crack patterns, hysteresis and envelope curves, ductility factor, stiffness degradation‎, and energy dissipation are assessed and corresponded to the control sample. The results demonstrate that UHPFRC strengthened the joint, prevented crack development and extension and the shear failure in the joint, and formed the plastic hinge in the beams. UHPFRC outperforms normal concrete with seismic reinforcing details and UHPC without steel fiber in bearing capacity, ductility, stiffness, and energy dissipation. UHPFRC with 1% steel fiber enhanced joint behavior, while UHPFRC with 2% steel fiber was better. Casting the whole sample with UHPFRC achieved very little improvement. The presence of stirrups in the UHPFRC beam-column joint has little effect on its properties. It is more economical to casting UHPFRC in the joint zone only and reduce or eliminate these stirrups in the case of UHPFRC
Bibliometric analysis of holographic data storage literature
Authors: Kumar K. , Parameswaran R. 
Published: April 2023

Objectives.Snapshots of data can be stored in a holographic medium at varying depths. Data can be written via a spiral data channel in spinning holographic media in the form of circular disks like CDs or DVDs. This data is then read by shining a reference beam through the refraction following writing. However, holographic storage is distinct from CD/DVD media in the sense that information is encoded in all three dimensions. Two-dimensional data is written using a single laser beam that spirals around the material. Prototype holographic storage solutions use minuscule cones formed by individual snapshots or pages to store one million pixels. As compared with magnetic disks and tapes, which have a finite lifespan of 50 years at most, the longevity and dependability of optical media storage is advantageous for long-term archiving. Holographic technology allows for the portability of data-intensive media such as broadcast or high-definition video. However, the shelf life of holographic media remains low due to its sensitivity to light. The primary goals of most storage devices are more storage space and faster data transport. Holographic storage devices have the potential to outperform traditional optical storage devices both in terms of capacity and performance. The present paper aims to evaluate the current international research trends in Holographic Data Storage (HDS) and produce a graphical mapping of co-authorship and countries.Methods.The major outputs of the dataset were authors, document type, publication, institution, nation, and citations. After exporting 1052 data sources,HistCitesoftware was used to analyze the citations; visualization mapping was carried out usingVOSviewersoftware and R programming language for the analysis of the authorcountry-title association on Holographic Storage Devices.Results.The most prominent authors, papers, journals, organizations, and nations in the field of HDS were identified inHistCite. Then, four clusters were investigated usingVOSviewerbased on author keywords, citation collaboration networks among different organizations, countries, and the HDS co-authorship network.Conclusions.During the study period from 2000–2020 (21 years), 4636 authors contributed to 1052 publications. The highest number of publications was in 2009, with a linear adjustment ofR2 = 0.0136. The most prolific author, Lee J., published 3.14% of the articles on this subject. In terms of country distribution, Japan took first-place ranking, claiming 16.54% of the total number of articles. The “holographic” keyword was used in 62.55% of the articles.
Models and methods for analyzing complex networks and social network structures
Authors: Perova Juю P. , Grigoriev V. P. , Zhukov D. O. 
Published: April 2023

Objectives. The study aimed to investigate contemporary models, methods, and tools used for analyzing complex social network structures, both on the basis of ready-made solutions in the form of services and software, as well as proprietary applications developed using the Python programming language. Such studies make it possible not only to predict the dynamics of social processes (changes in social attitudes), but also to identify trends in socioeconomic development by monitoring users’ opinions on important economic and social issues, both at the level of individual territorial entities (for example, districts, settlements of small towns, etc.) and wider regions.Methods. Dynamic models and stochastic dynamics analysis methods, which take into account the possibility of self-organization and the presence of memory, are used along with user deanonymization methods and recommendation systems, as well as statistical methods for analyzing profiles in social networks. Numerical modeling methods for analyzing complex networks and processes occurring in them are considered and described in detail. Special attention is paid to data processing in complex network structures using the Python language and its various available libraries.Results. The specifics of the tasks to be solved in the study of complex network structures and their interdisciplinarity associated with the use of methods of system analysis are described in terms of the theory of complex networks, text analytics, and computational linguistics. In particular, the dynamic models of processes observed in complex social network systems, as well as the structural characteristics of such networks and their relationship with the observed dynamic processes including using the theory of constructing dynamic graphs are studied. The use of neural networks to predict the evolution of dynamic processes and structure of complex social systems is investigated. When creating models describing the observed processes, attention is focused on the use of computational linguistics methods to extract knowledge from text messages of users of social networks.Conclusions. Network analysis can be used to structure models of interaction between social units: people, collectives, organizations, etc. Compared with other methods, the network approach has the undeniable advantage of operating with data at different levels of research to ensure its continuity. Since communication in social networks almost entirely consists of text messages and various publications, almost all relevant studies use textual analysis methods in conjunction with machine learning and artificial intelligence technologies. Of these, convolutional neural networks demonstrated the best results. However, the use of support vector and decision tree methods should also be mentioned, since these contributed considerably to accuracy. In addition, statistical methods are used to compile data samples and analyze obtained results.
Improving the efficiency of an optical-to-terahertz converter using sapphire fibers
Authors: Zenchenko N. V. , Lavrukhin D. V. , Glinskiy I. A. , Ponomarev D. S. 
Published: April 2023

Objectives. The study aims to improve the efficiency of a large-area photoconductive terahertz (THz) emitter based on an optical-to-terahertz converter (OTC) having a radiating area of 0.3 × 0.3 mm2 for generating high-power THz radiation by using an array of close-packed profiled sapphire fibers having a diameter in the range of 100–300 μm as focusing optics.Methods. As a photoconductive substrate, we used a semi-infinite LT-GaAs layer (low-temperature grown GaAs; GaAs layer grown by molecular beam epitaxy at a low growth temperature). Additional Si3N4 and Al2O3 layers are intended for reducing leakage currents in the OTC and reducing the reflection of the laser pump pulse from the air/semiconductor interface (Fresnel losses), respectively, at a gap width of 10 μm. For forming the antenna electrodes and feed strips, the Ti/Au metal system was used. The simulation was carried out by the finite element method in the COMSOL Multiphysics environment.Results. The use of a profiled sapphire fiber whose diameter has been optimized with respect to the gap parameters to significantly increase the concentration of charge carriers in the immediate vicinity of the electrodes of an OTC is demonstrated. The integrated efficiency of a large-area photoconductive THz emitter was determined taking into account the microstrip topology of the array with a characteristic size of feed strips proportional to the gap width in the OTC and with the upper (masking) metal layer. The maximum localization of the electromagnetic field in close proximity to the edges of electrodes at the “fiber–semiconductor” interface is achieved with a profiled sapphire fiber diameter of 220 μm.Conclusions. By optimizing the diameter of the sapphire fiber, the possibility of improving the localization of incident electromagnetic waves in close proximity to the edges of the OTC electrodes by ~40 times compared to the case without fiber, as well as increasing the overall efficiency of a large-area emitter by up to ~7–10 times, was demonstrated.
Methodological features of the analysis of the fractal dimension of the heart rate
Authors: Bykova M. O. , Balandin V. A. 
Published: April 2023

Objectives. The aim of the present work is to determine the fractal dimension parameter calculated for a sequence of R–R intervals in order to identify the boundaries of its change for healthy and sick patients, as well as the possibility of its use as an additional factor in the detection of cardiac pathology.Methods. In order to determine the fractal dimension parameter, the Hurst-, Barrow-, minimum coverage area-, and Higuchi methods are used. For assessing the stationarity of a number of electrocardiography (ECG) intervals, a standard method is used to compare arithmetic averages and variances from samples of the total data array of ECG intervals. To identify differences in fractal dimensions of healthy and sick patients, this parameter was ranked. Using the Kolmogorov–Smirnov two-sample criterion, the difference between the distribution laws in the samples for healthy and sick patients is shown.Results. Among the considered methods for calculating the fractal dimension, the Higuchi method demonstrates the smallest data spread between healthy patients. By ranking the calculated fractional dimension values, it was possible to identify the difference between this parameter for healthy and sick patients. The difference in the distribution of fractal dimension of healthy and sick patients is shown to be statistically significant for the coverage and Higuchi methods. At the same time, when using the traditional Hurst method, there is no reason to reject the null hypothesis that two groups of patients belong to the same general population.Conclusions. Based on the obtained data, the difference between the fractal dimension indicators of the duration of R–R intervals of healthy and sick patients is shown to be statistically significant when using the Higuchi method. The fractal dimensions of healthy and sick patients can be effectively distinguished by ranking samples. The results of the research substantiate prospects for further studies aimed at using fractal characteristics of the heart rhythm to identify abnormalities of the latter, which can serve as an additional factor in determining heart pathologies.
Robust neural network filtering in the tasks of building intelligent interfaces
Authors: Vasiliev A. V. , Melnikov A. O. , Lesko S. A. 
Published: April 2023

Objectives.In recent years, there has been growing scientific interest in the creation of intelligent interfaces for computer control based on biometric data, such as electromyography signals (EMGs), which can be used to classify human hand gestures to form the basis for organizing an intuitive human-computer interface. However, problems arising when using EMG signals for this purpose include the presence of nonlinear noise in the signal and the significant influence of individual human characteristics. The aim of the present study is to investigate the possibility of using neural networks to filter individual components of the EMG signal.Methods.Mathematical signal processing techniques are used along with machine learning methods.Results.The overview of the literature on the topic of EMG signal processing is carried out. The concept of intelligent processing of biological signals is proposed. The signal filtering model using a convolutional neural network structure based on Python 3, TensorFlow and Keras technologies was developed. Results of an experiment carried out on an EMG data set to filter individual signal components are presented and discussed.Conclusions.The possibility of using artificial neural networks to identify and suppress individual human characteristics in biological signals is demonstrated. When training the network, the main emphasis was placed on individual features by testing the network on data received from subjects not involved in the learning process. The achieved average 5% reduction in individual noise will help to avoid retraining of the network when classifying EMG signals, as well as improving the accuracy of gesture classification for new users.
Optimization of spline parameters in approximation of multivalued functions
Authors: Karpov D. A. , Struchenkov V. I. 
Published: April 2023

Objectives. Methods for spline approximation of a sequence of points in a plane are increasingly used in various disciplines. A spline is defined as a single-valued function consisting of a known number of repeating elements, of which the most widely used are polynomials. When designing the routes of linear structures, it is necessary to consider a problem with an unknown number of elements. An algorithm implemented for solving this problem when designing a longitudinal profile was published earlier. Here, since the spline elements comprise circular arcs conjugated by line segments, the spline is a single-valued function. However, when designing a route plan, the spline is generally a multivalued function. Therefore, the previously developed algorithm is unsuitable for solving this problem, even if the same spline elements are used. The aim of this work is to generalize the obtained results to the case of approximation of multivalued functions while considering various features involved in designing the routes of linear structures. The first stage of this work consisted in determining the number of elements of the approximating spline using dynamic programming. In the present paper, the next stage of solving this problem is carried out.Methods. The spline parameters were optimized using a new mathematical model in the form of a modified Lagrange function and a special nonlinear programming algorithm. In this case, it is possible to analytically calculate the derivatives of the objective function with respect to the spline parameters in the absence of its analytical expression. Results. A mathematical model and algorithm were developed to optimize the parameters of a spline as a multivalued function consisting of circular arcs conjugated by line segments. The initial approximation is the spline obtained at the first stage.Conclusions. The previously proposed two-stage spline approximation scheme for an unknown number of spline elements is also suitable for approximating multivalued functions given by a sequence of points in a plane, in particular, for designing a plan of routes for linear structures.
ON THE CONTROVERSIAL LOCALIZATION OF THE TSAKHAR FORTRESS IN THE PASCHAL FORTIFICATION
Authors: Trebeleva Galina , Sakania Suram , Kizilov Andrey , Glazov Konstantin 
Published: April 2023

The issue of localization of one or another toponym known from narrative sources is often ambiguous and causes discussions in the scientific community. This article is devoted to the analysis introduced into scientific circulation by Yu.N. Voronov and the well-established identification of a famous monument on the left bank of the Kodor – the Pskal fortification with the Tzakhar fortress, described by Agafius of Mirineisky. The Pskal fortification is a temple surrounded by a fortress wall with a total area of 1100 m². The authors of the article carried out a detailed analysis of the geographical location of the fortification, made a full-scale inspection, created photogrammetric models of the landscape and the temple itself. The geographical location of the monument showed that the Pskalsky fortification was connected with the region of the left bank of the Kodor River, and not with the Tsebelda Valley and the Misimians, which Agathius of Mirineisky describes, and which were located on the right bank of this river. The absence of a description of the crossing over the river and the inconsistency of the fortification area described in the source regarding the Ttsakhar fortress allows us to say that the identification of the Pskal fortress with Ttsakhar is premature and extremely controversial. An analysis of the design features of the temple made it possible to find a number of analogies among other monuments of the region, including those studied archaeologically, thanks to which we can state: monuments of this type: small temples with a semicircular apse inscribed in a common rectangular outline, with two semicircular niches on both sides of the apse semicircle could not have been built later than the 12th century, but they are not monuments of the Tsebelda era either. They can be attributed to the era of the emergence of a single Abkhazian kingdom. Thus, the fortification on Mount Pskal is not the ancient Misimian fortress Ttsakhar from the era of late antiquity, but a monument of the medieval history of the Abkhazian kingdom, which still requires its detailed study.
ISLAMIC CULTURAL AND EDUCATIONAL SOCIETIES,
PRINTING HOUSES, NATIONAL PRESS AND MUSLIM ENLIGHTENMENT IN THE NORTHERN CAUCASUS IN THE FIRST THIRD OF THE XX CENTURY
Authors: Navruzov Amir R. 
Published: April 2023

The question of the origin and history of the development of the Muslim enlightenment of the North Caucasus in the first third of the 20th century has not been developed in the literature at all, there are almost no works on this topic, sources in the Eastern and Dagestan languages ​​have not been studied and introduced into scientific circulation. This article is an attempt to fill this gap to some extent. Creation in 1903 The Islamic printing house of M. Mavraev in Temir-Khan-Shura marked the beginning of the mass publication of printed materials of an educational orientation in Arabic and Dagestan languages ​​using Arabic graphics. The role of the cultural and educational societies of Dagestan, created during this period at the expense of the money of jamaats and sadak (donations), zakat, wills, waqfs, is enormous. The press in Arabic and national languages, which contributed to the enlightenment of the Dagestan peoples and the development of national languages ​​and cultures, was of inestimable importance for the promotion of Islamic educational ideas and the formation of public opinion. In the first third of the 20th century, groups of like-minded people formed in the region, united by the idea of ​​reviving the values ​​of Islam among the peoples of the North Caucasus. We can name among them such names as Ali Kayaev, Abusufyan Akaev, Muhammadmirza Mavraev, Badavi Saidov, Muhammad Dibirov, Seifulla-kadi Bashlarov, editorial boards of newspapers in the Dagestan languages: Avar, Lak, Kumyk, as well as many other Muslim educators who collaborated in these publications. All these factors together gave a powerful impetus to the formation and development of Muslim enlightenment in the North Caucasus in the first third of the 20th century.
The Thermo-Optical Treatment of Cancer by Laser Light with Ag Nanoparticles
Authors: HasanTuhmaz H.  
Published: April 2023

In this paper, the photo thermal treatment of cancer with Ag nano- particles is studied. The PTT for tissue under the effect of heat by laser source with injection of silver nano- particles on the affected area. Bio-heat equation is solved by the numerical simulation methods. Results are summarized in the effect on the increasing of temperature at different time durations. These results are looked that the depth penetration of laser that lead to increasing heat raising during the increasing the time duration of exposure. Then, it estimated the peak value of depth on limited temperature.
Implementation Audit Internal of Quality Management System Iso 9001:2015 in the Purchasing Activities Technical Department at Pt Sango Indonesia
Authors: Evi Evi Lutfiyana , Gantino Rilla 
Published: April 2023

This study analyzes of implementation audit internal of the quality management system ISO 9001:2015 in the purchasing activities technical department at PT Sango Indonesia. The aims of this study are to understand the quality standard and quality improvement of PT Sango Indonesia, analyze ISO 9001:2015 quality management standard operational procedure (SOP) in purchasing activities and determine the impact of implementing ISO 9001:2015 internal quality management systems on product quality. This research uses a qualitative descriptive method; the population in this research is all employees at PT Sango Indonesia is 103 employees. The sample in this study was taken from 55 employees who are related to variable research. Meanwhile, the technique of research uses observation, interviews, questionnaires and documentation. Besides that, they analyze data using internal control questionnaire (ICQ), Likert scale and uji statistics. The results of this research show that the implementation of the internal audit quality management system ISO 9001:2015 uses internal control questionnaire (ICQ) in the standard operational procedure (SOP) of purchasing activities at PT Sango Indonesia for each department obtained good strength where department user get percentage middling effective, leadership gets effective, engineering middling effective, purchasing effective, supplier middling effective and accounting effective. In order to support of purchasing activities continuity, In order to support of purchasing activities continuity, it is necessary to create an information system that can provide convenience for purchasing activities process so that the information produced is accurate and appropriate. Then, the average achievement of implementation internal audit for each indicator at PT Sango Indonesia is very effective on internal audit competency and scope internal audit, besides other indicators achievement results are effectiveness. Meanwhile, the result of the statistical test showed that internal audits had a significant effect on product quality with the indicators used by researchers. Thus, the company must disseminate information related to certification ISO 9001:2015 that it carries out activities according to established procedures.