bluuebunny/crossref_metadata_2025 huggingface dataset:
Utilization of empon-empon stem waste in the creation of eco-friendly homeware products
Authors: Sumarno Sumarno , Prasetyo Raden Ersnathan Budi , Cahyana Agung , Sugiarto Catur
Published: October 2024

Empon-empon stems, considered agricultural waste, present an untapped resource for crafting natural fiber products. While materials like banana stems, water hyacinth, and jute are commonly used for this purpose, empon-empon stems offer a novel alternative. This study explores the potential of empon-empon stems in creating ropes and other homeware products, aiming to not only reduce agricultural waste but also to provide additional income streams for farmers. The research methodology involves a comprehensive process of harvesting, separating, drying, and twisting empon-empon stems into rope. Additionally, a design-driven material (DDM) approach is employed to convert the rope into various products such as baskets, planter stands, and trays. The DDM approach includes analyzing material characteristics, visual exploration, creating shop drawings, and producing prototypes. The results demonstrate that empon-empon rope products are not only functional and aesthetically pleasing but also carry a unique aroma, adding to their appeal. These products have the potential to address the shortage of natural fibers in the craft industry and can serve as an alternative material for interior design applications. In conclusion, this research highlights the feasibility of utilizing empon-empon stems as a sustainable material for crafting innovative homeware products. By transforming agricultural waste into valuable goods, this approach contributes to both environmental sustainability and economic development in rural areas.
Collective memory in traditional bèsèk packaging: impact on buyer perception at Omah Jenang Blitar
Authors: Sutrisno Andika Agung , Sunarto Bambang , Pujiyanto Pujiyanto
Published: October 2024

This research examines the design of basic packaging for traditional culinary products at Omah Jênang Kêtan Kelapa Sari Blitar, using it as a case study. It critically evaluates the relationship between traditional culinary products, effective packaging, and labels. Bèsèk packaging not only protects culinary products from damage but also enhances their appeal with a natural and traditional look. The packaging label provides essential information about the product, including composition, expiration date, and storage instructions. The aim is to evaluate how traditional packaging influences consumer perceptions and to understand the relationship between traditional culinary products and their packaging and labels. This study offers insights into the significance of preserving traditional elements in packaging design and how these elements can inform more effective marketing strategies. A qualitative data analysis method is employed to assess the packaging design used by Omah Jênang Kêtan Kelapa Sari Blitar, focusing on visual stimuli and their impact on consumer memory. The research found that good packaging design fosters emotional bonds between traders and buyers, rooted in traditional collective memories, which enhances the durability and sustainability of the packaging. Additionally, Bèsèk's packaging design connects with collective memory, associated with romance and stories of past events, increasing consumer interest in recalling these experiences. The findings provide insights into how various packaging designs influence consumer perceptions and feelings toward traditional culinary products. This research underscores the importance of visual attributes in packaging design, highlighting their ability to stimulate consumer perceptions of collective memory and create meaningful, memorable packaging experiences.
The Effect of the Inhibitory Composition on the Composition of Paraffin Hydrocarbons in Oil Sediments
Authors: Prozorova I. V. , Yudina N. V.
Published: October 2024

The effect of an inhibitory composition based on an amphiphilic polymer of polyacrylate and stearic acid on the composition of paraffinic hydrocarbons in asphalt-resin-paraffin deposits (ARPD) of high-paraffin oil was studied. It is shown that with the addition of an amphiphilic polymer and a composition to oil, differences are observed in the nature of their molecular mass distribution of paraffinic hydrocarbons of the surfactants. The action of the polymer leads to a decrease in the content of hydrocarbons of the composition C16–C21 and an increase in the proportion of high-molecular hydrocarbons C22–C34. The use of stearic acid as a surfactant in the composition, on the contrary, reduces the amount of high molecular weight paraffin hydrocarbons.
Antioxidant Activity of Asphaltene and Resinous Components in the Magnetic Field
Authors: Loskutova Yu. V. , Yudina N. V. , Lukyanets A. V.
Published: October 2024

Using the voltammetric method of oxygen electroreduction, an analysis of the antioxidant activity of resin-asphaltene components isolated from 2 crude oils of different compositions before and after exposure to a magnetic field was carried out. For the studied asphaltenes, weakly polar and polar resins, an increase or decrease in antioxidant activity is observed with increasing sample concentration in the background electrolyte solution. Petroleum antioxidants are part of a complex colloidal structural system and are associated with it by associative interactions that arise as a result of changes in the size and activity of associates of the petroleum system as a whole.
Characteristics of High Molecular Components Obtained by Thermal Destruction of Oil Residue Asphaltenes in Supercritical Water
Authors: Nalgieva Kh. V. , Kopytov M. A.
Published: October 2024

The composition and characteristics of high-molecular components of the thermolysis products of petroleum residue asphaltenes obtained in supercritical water without/with a catalyst based on iron oxides have been studied. The experiments were carried out in an autoclave at a temperature of 450°C for 60 minutes; the catalyst was prepared in situ from iron (III) tris-acetylacetonate. The use of supercritical water and an in situ catalyst makes it possible to increase the yield of saturated and aromatic hydrocarbons by more than 9.5 times compared to the control experiment (thermolysis without water and a catalyst) and reduce the yield of solid products insoluble in chloroform. The properties of high molecular weight components isolated from thermolysis products were characterized using structural group analysis and IR spectroscopy. High molecular weight components obtained by thermolysis in supercritical water in the presence of a catalyst, in comparison with the products obtained in the control experiment, are characterized by a higher H/C ratio and content of oxygen-containing groups, as well as a lower average molecular weight.
Interaction of Humic Acids with Naphthalene
Authors: Yudina N. V. , Petrenko T. V.
Published: October 2024

The interaction of humic acids (HA) isolated from oxidized brown coal with the polyaromatic hydrocarbon naphthalene has been studied. The electron-donating properties of HA were evaluated by the intensity of electronic transitions in the UV region and the calculated descriptors. The modification of the HA structure was carried out by the method of mechanical activation (MA) under alkaline and oxidative conditions. A significant increase in the proportion of aromatic and oxidized fragments in the HA structure after MA under oxidative conditions increased the intensity of binding of HA to naphthalene. A significant increase in the adsorption capacity of mechanoactivated HA in a dispersive aqueous medium with naphthalene has been shown.
Post-Pyrogenic Changes in the Microflora and Chemical Composition of Peat Waters of the Drained Area of the Bakchar Bog (Tomsk Region)
Authors: Ovsyannikova V. S. , Kharanzhevskaya Yu. A. , Sinyutkina A. A.
Published: October 2024

A comparative analysis of changes in the microbiological and chemical composition of water and peat in the drained reference and post-pyrogenic areas of the Bakchar bog was performed during the growing season of 2022. It has been revealed that peat-bog fire effect persists in the upper layer (up to 50 cm) of the post-pyrogenic area even 6 years after the fire. It manifests itself in a disruption of the seasonal dynamics of the content of a number of components (O2, CO2, NH+4, NO–3), and in the variance of count of microflora of different physiological groups, such as ammonifying, pedotrophic, oligotrophic, hydrocarbon-oxidizing, cellulose-destructing, denitrifying, and sulfate-reducing groups. In addition, the correlations between the analyzed microbiological and physicochemical parameters differ for the reference and post-pyrogenic areas, which suggests the long-term pyrogenic effect on the processes of accumulation and destruction of organic matter.
First Data on the Distribution, Some Features of Ecology and Size Composition of Rock Greenling Hexagrammos lagocephalus (Hexagrammidae) in the Southwestern Bering Sea during the Winter-Spring Period
Authors: Kurbanov Yu. K. , Terentiev D. A.
Published: October 2024

Based on the materials collected during the monitoring of bottom trawl fishery, the data on the distribution, thermal habitat conditions and size composition of the rock greenling Hexagrammos lagocephalus in the southwestern Bering Sea in the winter-spring period are presented for the first time. The main sites of catches of this species are located in areas with a complex bottom relief, mainly at protruding capes at depths of 134-498 m at a near-bottom layer of water temperature of 0.5–3.8°C. High frequency of occurrence and catches in February–March were recorded in the range from 201–400 m, while in April–May, a gradual migration of some fish to the shelf was observed. It was found that rock greenling is not characterized by spatial changes in the size composition, and the catches are mainly formed by medium-sized individuals with a total length of 39-47 cm. The results of the analysis of the length–weight relationship of fish in the southwestern Bering Sea in comparison with that in the Pacific waters off Kamchatka and the northern Kuril Islands may indicate a similar growth pattern of rock greenling in adjacent waters.
Feeding of Walleye Pollock Gadus chalcogrammus (Gadidae) in the Epipelagic Zone of the Bering Sea
Authors: Gorbatenko K. M. , Melnikov I. V. , Sheibak A. Yu.
Published: October 2024

From 1982–1990 to 2006–2010 in the western part of the Bering Sea biomass of the walleye pollock Gadus chalcogrammus decreased by almost an order of magnitude, from 7.2 to 0.7 million tons. However, in the last decade (2011–2020) its biomass increased to the long-term average value (4.0 million tons). In the eastern part of the sea, the pollock biomass dynamics was of the wave-like nature with the highest value in 1982–1990 and the lowest, in 2006–2010. The food spectrum of the walleye pollock is wide and includes 16 taxonomic groups of aquatic organisms. The main part of average annual food mass consumed by pollock in the Bering Sea in 1982–2020 consisted of zooplankton (74.1%). During different study periods, annual feed consumption varied from 91.1 to 373.0 (average 239.3) million tons per year. Significant fluctuations in the volume of food consumed are mainly associated with the dynamics of the species’ biomass.
Applicability of high-performance liquid chromatography to the analysis of cardiac glycosides in lily-of-the-valley medicines (review)
Authors: Beketova Anastasia V. , Evdokimova Olga V. , Shemeryankina Tatyana В. , Bagirova Valeria L.
Published: October 2024

Introduction. The standardisation of lily-of-the-valley (Convallaria majalis) herbal drugs containing cardiac glycosides of the cardenolide group currently uses either animal bioassays or spectrophotometry. The need to explore the possibility of abandoning animal testing makes it essential to find a selective and sensitive physicochemical method for the determination of cardiac glycosides in lily of the valley.
Aim. This study aimed to select an appropriate alternative to animal testing through a comparative analysis of scientific publications on physicochemical methods for the determination of cardenolide cardiac glycosides.
Discussion. According to the analysis of identification and quantification methods for cardenolides, animal testing does not provide sufficient accuracy and reproducibility for the standardisation of herbal drugs, herbal drug preparations, and herbal medicinal products. However, spectrophotometry does not provide sufficient specificity, and thin-layer chromatography is mainly applicable to the identification of cardenolides. This article presents the results of comparing the chromatographic conditions used for cardenolide determination by high-performance liquid chromatography (HPLC) with various detectors. According to the study results, HPLC can replace animal bioassays or insufficiently selective methods in the determination of cardiac glycosides in lily-of-the-valley products. The development of analytical procedures for cardenolide determination can be based upon reverse-phase HPLC with octadecylsilyl (С18) as the stationary phase, a solvent mixture comprising water, acetonitrile, and/or methanol in different proportions as the mobile phase, and a diode-array detector at 220 ± 2 nm.
Conclusions. The results of this comparative analysis indicate that the method for the identification and quantification of cardiac glycosides in lily-of-the-valley herbal drugs, herbal drug preparations, and herbal medicinal products is promising for further study and experimentation. HPLC is applicable for routine use and can replace animal bioassays or insufficiently selective methods in the determination of lily-of-the-valley cardiac glycosides.
Diffusion nickel-cobalt coatings for protection of solid oxide electrolysis cells’ current collectors made of Crofer 22 APU steel
Authors: Pikalov O. V. , Demeneva N. V. , Zverkova I. I. , Bredikhin S. I.
Published: October 2024

The evolution of the microstructure and composition of Ni-Co coatings for the protection of current collectors made of stainless chromium steel Crofer 22 APU from oxidation in the operating mode of the anode chamber of solid oxide electrolysis cells (SOEСs) has been studied. It is shown that due to the diffusion of the components of the steel and the coating, as well as the redox reactions occurring under the coating in the operating mode of the SOEС, the diffusion of chromium to the surface of the current collector is blocked. During operation in the air atmosphere of the anode chamber, the composition of the protective coating changes from metallic Ni-Co to a mixture of highly conductive oxides (Fe,Ni,Co)3O4 and (Ni,Co)O, which leads to a change in the type of time dependence of the specific surface resistance of the junction current collector-anode. At the same time, the obtained values of ~17 mOhm cm2 during tests of 7000 hours are quite low and these coatings can be used to protect SOEС stack current collectors made of stainless chromium steel from oxidation.
The effect of the nature of pore former on the microstructure of SOFC anodes based on NiO and 10YSZ formed by hybrid 3d printing
Authors: Malbakhova I. A. , Bagishev A. S. , Vorobyev A. M. , Borisenko Т. А. , Titkov A. I.
Published: October 2024

In this work, anodes based on nickel oxide and zirconium oxide-stabilized yttrium oxide were developed by the method of hybrid inkjet 3D printing with laser treatment. The granulometric composition of the NiO/Zr0.9Y0.1O2 (10YSZ) composite and the rheological characteristics of printing pastes based on it were determined. Experiments were carried out on printing three-dimensional test objects using the developed ceramic paste. The influence of additionally injected into the composition pore formers – graphite and potato starch – on the rheological characteristics of the paste was studied. The obtained samples of supporting anodes were studied by a complex of physicochemical methods to determine the morphological and structural characteristics.
Magnetron technology for manufacturing electrodes of electrolysers with a proton-exchange membrane
Authors: Nefedkin S. I. , Ryabukhin A. V. , Eletskikh V. E. , Boldin R. G. , Mikhnevich V. D. , Klimova M. A.
Published: October 2024

The results of the development and study of catalysts for the anode of water decomposition electrolyzers with a proton exchange membrane are presented. To deposit catalytic layers on a titanium carrier, the magnetron method of sputtering composite targets in a vacuum was used. Iridium and ruthenium were used as the main catalyst, and molybdenum, chromium, and titanium were used as functional additives. The electrochemical and structural characteristics of catalytic coatings have been studied. Using voltammetry methods, cyclic current-voltage and anodic characteristics of catalytic compositions were obtained, including at different temperatures of subsequent heat treatment in air, as well as at different measurement temperatures. The Tafel slopes of the current-voltage characteristics of the composite anodes, as well as the currents at a potential of 1.55 V (RHE), were determined. It has been shown that the minimum slopes were obtained for the Ir–Ru–Mo–Ti catalytic composition (b = 40–63 mV/dec), and the maximum currents for the Ir–Mo–Cr catalytic composition (i = 100–110 mA/cm2 at E = 1.55 V (RHE)). It has been shown that the magnitude of CV adsorption currents in the anodic potential region correlates with the coefficient b of the Tafel equation E–lgi and determines the number of catalytic centers for the deprotonization stage of the oxygen evolution reaction. However, the activity of the catalyst in the OER is determined not only by the number of such centers, but mainly by the functional features of the catalyst itself, i.e., the composition of the catalyst and the conditions for its preparation (including the temperature of subsequent heat treatment of the catalyst in air). Catalytic compositions based on iridium with additions of molybdenum and chromium have higher activity in OER. Structural studies have shown that during magnetron sputtering of composite targets, even with small catalyst loadings, dispersed structures are formed, which on real porous titanium anodes should form on the front surface with a higher catalyst content.
Formative processes in nursing intervention in palliative care in internal medicine service patients
Authors: López Paredes Ximena Silvana , Silva Segura Sharon Thalía , Valencia Aguay Erika Melisa
Published: October 2024

The purpose of the research project was to determine the nursing intervention in palliative care in patients of the Internal Medicine service of the Alfredo Noboa Montenegro Hospital during the period October 2023- February 2024, since nursing professionals are exposed to social, health and service changes, whose deficiency or lack of knowledge can limit an integral, personalized and quality intervention that allows care from individuality, flexibility, continuity, accessibility and polyvalence. A descriptive, cross-sectional, bibliographic and field method was applied with a quantitative approach, whose research design was non-experimental and cross-sectional, applying a sample by convenience with a total of 17 nursing professionals working in the internal medicine service, in addition, a survey of 29 questions distributed in four dimensions was used to collect the information; actions, education, psycho-emotional support, spiritual and grief. According to the results, it was possible to demonstrate the deficiencies of nursing professionals, especially in the identification of palliative needs, symptom assessment, intervention processes, use of tools to assess psychoemotional and spiritual needs, pharmacological approach and information on bereavement, which made it necessary to establish a palliative care guide focused on nursing professionals, to be subsequently socialized with all personnel.
Concentration and multiple normalized solutions for a class of biharmonic Schrödinger equations1
Authors: Wang Li , Tian Liang , Chen Jianhua
Published: October 2024

In the present paper, we study the existence and concentration of multiple normalized solutions to the following nonlinear biharmonic Schrödinger equation: ε 4 Δ 2 u + V ( x ) u = λ u + h ( u ) , x ∈ R N , ∫ R N | u | 2 d x = c 2 ε N , x ∈ R N , where ε > 0 is a positive parameter, λ ∈ R is unknown and appears as a Lagrange multiplier, and V is a positive potential such that inf Λ V < inf ∂ Λ V for some open bounded subset Λ ⊂ R N ( N ⩾ 5 ). Applying the penalization techniques and Ljusternik–Schnirelmann theory, we obtain multiple mormalized solutions u ε . When ε → 0, these solutions concentrates around a local minimum of V. This paper extends the results of Alves and Thin (2023), which considered the nonlinear Schrödinger equations with general nonlinearities, to the biharmonic Schrödinger equations. We develop a truncated skill to obtain the minimum via careful analysis. Moreover, we also obtain orbital stability of the solutions.
Computing strategies for multiple cops on infinite graphs
Authors: McLeod Alexa , Solomon Reed
Published: October 2024

Cops and robbers is a vertex pursuit game played on connected reflexive graphs. While the game is most often played with a single cop on a finite graph, we consider the variation in which n cops pursue the robber on an infinite graph. For each n ⩾ 2, we show there is a computable graph which is classically cop-win and can be won by n cops using a computable strategy, but cannot be won by n − 1 cops using a computable strategy. Furthermore, we show that the index set of n-cop-win computable graphs is Π 1 1 -complete.
Static Distance Measurement of Satellite Receiver Based on GA Optimized TCN-FC
Authors: Sun Weiliang , Liu Ming , Li Hanlin , Ma Xinming
Published: October 2024

In order to measure absolute distances between multiple targets over a wide range, a measurement estimation method is designed which is based on a fusion strategy of temporal features and nonlinear fitting of satellite receiver positions. The method takes the undifferential-corrected latitude and longitude data collected by a low-cost satellite receiver through wavelet denoising, and then realizes the accurate distance estimation of the measurement target through the fitted regression model designed to fuse the Temporal Convolutional Network (TCN) and the Fully Connected network (FC).To enable model training, a dataset featuring deep fusion characteristics is constructed, while employing a Genetic Algorithm (GA) to optimize the weights and thresholds of the model’s fully connected layer, thereby enhancing its nonlinear regression capability. The method also makes up for the defect of the Haversine formula for latitude and longitude distance calculation, which has a high demand for localization accuracy. The experimental results show that the neural network model designed and optimized in this paper is better than the other six models in terms of performance, which fully verifies that the method has good data fitting ability and prediction accuracy, and is practical in the static distance measurement problem.
Multi-Objective Optimization of Fixture Layout for Large Compliant Part Assembly Considering Locating Errors
Authors: Hong Ge , Fan Yijing , Li Rourou , Zhu Ying , Xia Tangbin , Pan Ershun
Published: October 2024

In the ship assembly process, numerous large compliant parts are assembled together. The design of the fixture layout considering locating errors is a crucial task for large compliant part assembly. However, the current experience-based fixture layouts that ignore fixture locating errors can result in part deformation, further impacting the assembly quality and efficiency. Thus, this paper develops a new methodology for optimizing the fixture layout of compliant parts to be assembled with consideration of fixture locating errors. Firstly, the part deformation caused by fixture layouts and locating errors is calculated using the matrix stiffness method. Subsequently, a multi-objective optimization model is formulated to minimize the dimensional gaps and enhance the straightness of the assembly clearance. Finally, the nondominated sorting genetic algorithm II is utilized to find Pareto-optimal solutions for the model. The effectiveness of the proposed method is illustrated and validated through a case study in the shipbuilding industry.
Service-Oriented Opportunistic Maintenance Strategy for Multi-Position Manufacturing Systems
Authors: Yang Huaqiang , Chen Shitao , Wang Liqiong , Xia Tangbin , Si Guojin
Published: October 2024

With the global layout and the product-service requirement of modern production enterprises, service-oriented manufacturing and maintenance services have gained growing attention. This new trend promotes a transformation from traditional in-house maintenance to proactive outsourcing maintenance for geographically distributed enterprises. For this purpose, we develop a service-oriented opportunistic maintenance strategy for multi-position manufacturing systems. At the component-level scheduling, the preventive maintenance intervals of components are obtained by minimizing the maintenance cost rate. At the system-level grouping, according to the calculation of maintenance cost saving, the group maintenance among scattered components is determined. At the network-level optimization, the overall service schemes are obtained based on the optimization of maintenance scheduling and workforce routing. This multi-level maintenance strategy has been verified through a case study with multi-unit systems. Compared with two conventional strategies, its mechanism with dynamical optimization can significantly reduce the total maintenance cost.
Integrated Optimization of VSS Control Chart and Maintenance for Small-Batch Production Processes
Authors: Sang Ziqing , Lu Biao
Published: October 2024

Recent research has increasingly focused on integrated statistical process control (SPC) and maintenance strategies in production systems, highlighting their critical role in quality control. Most integrated modeling of SPC and maintenance currently focus on large-scale production processes. However, production processes are transitioning towards multi-variety and small-batch production mode, which is characterized by insufficient sample sizes. Based on this characteristic, this paper studies the integrated modeling and optimization of Variable Sample Size (VSS) control chart and maintenance. This strategy employs an equal interval maintenance strategy. Within the preventive maintenance cycle, the sampling starts with a small sample size, and when the sampled result falls in the warning zone, the sample size is increased. Also, five maintenance scenarios are defined based on three maintenance types, the state of the process and whether the control chart triggers an alarm. The probabilities, costs, and durations for each scenario are also calculated accordingly. The integrated model then is established based on these scenarios, and genetic algorithms are used for case analysis to solve the optimal objective of the model. Based on the case analysis, it is demonstrated that the proposed integrated model can make effective decisions under various scenarios, thereby validating its applicability and effectiveness in small-batch production processes.
Fault Diagnosis of Piston Pump Based on Inception-LSTM Model with ECA Module
Authors: Wu Zelin , Jiang Yimin , Ding Yutong , Zhu Ying , Chen Zhen , Xia Tangbin
Published: October 2024

As the global industry continues to develop towards digitalization and intelligence, fault diagnosis has gradually become an important guarantee for the stability of equipment. It is a significant measure to avoid major safety accidents as well as property losses. The piston pump plays a very important role in petrochemical, aerospace, civil engineering, and other fields, so its reliability and safety are crucial. Some machine learning methods have been used in piston pump fault diagnosis, but the datasets in the real world often suffer from data imbalance problems. Besides, there could be compositional mashups or correlations between channels captured by different sensors. Responding to these issues, this paper proposes a novel Inception- long short-term memory (LSTM) model with efficient channel attention (ECA) module to recognize the 15 common faults of oilfield piston pumps. The inception module has been used to improve the ability of feature extraction from different granularity. The ECA module and LSTM module can extract the correlation between different channels as well as the anterior-posterior correlation of the data itself. Experiments have been performed on a piston pump dataset. The proposed model can achieve a diagnostic accuracy of 98.82%, and the convergence speed is also better than the other five benchmark methods. The results can confirm the effectiveness and the superiority of this proposed method.
Method for limiting the peak factor using an additional compensation signal in a system with orthogonal frequency division multiplexing for a Gaussian channel
Authors: Pham Th. T. , Tikhonova O. V.
Published: October 2024

Objectives.Orthogonal frequency division multiplexing (OFDM) has become the standard for various high-speed wireless communication systems due to its several advantages, one of which is the efficient use of bandwidth. The main disadvantage of OFDM is the high peak-power-to-average-power ratio (PAPR), which is indicated by an increase in the bit error rate due to the nonlinearity of the power amplifier. The paper sets out to evaluate the possibility of reducing the PAPR value using a limitation method developed by the authors involving an additional compensation signal in a channel with white Gaussian noise, as well as to analyze its main parameters.

Methods.Statistical radio engineering and computer modeling methods are used according to optimal signal reception theory.

Results.The effect of the OFDM signal limitation level and the number of additional signals when using the limitation method with an additional compensation signal on the quality (reduction of transmission losses) of the OFDM signal is analyzed. The results show a decrease in the OFDM signal PAPR value, along with the dependencies of the bit error rate on the signal-to-noise ratio at fixed limitation values and a determined number of additional signals in the channel with white Gaussian noise.

Conclusions.The proposed limitation method with an additional signal when transmitting an OFDM signal in a channel with white Gaussian noise provides compensation for information losses due to signal level limitations in the transmission channel. Increasing the limitation level is shown to increase the PAPR value, while varying the number of additional signals changes PAPR insignificantly. In order to ensure the effective implementation of the limitation method with an additional compensation signal, the parameters of the threshold limitation level and number of additional signals should be selected depending on the predicted signal-to-noise ratio in the system.
Automating the search for legal information in Arabic: A novel approach to document retrieval
Authors: Jafar K. S. , Mohammad A. A. , Issa A. A. , Panov A. V.
Published: October 2024

Objectives. The retrieval of legal information, including information related to issues such as punishment for crimes and felonies, represents a challenging task. The approach proposed in the article represents an efficient way to automate the retrieval of legal information without requiring a large amount of labeled data or consuming significant computational resources. The work set out to analyze the feasibility of a document retrieval approach in the context of Arabic legal texts using natural language processing and unsupervised clustering techniques.

Methods. The Topic-to-Vector (Top2Vec) topic modeling algorithm for generating document embeddings based on semantic context is used to cluster Arabic legal texts into relevant topics. We also used the HDBSCAN densitybased clustering algorithm to identify subtopics within each cluster. Challenges of working with Arabic legal text, such as morphological complexity, ambiguity, and a lack of standardized terminology, are addressed by means of a proposed preprocessing pipeline that includes tokenization, normalization, stemming, and stop-word removal.

Results. The results of the evaluation of the approach using a dataset of legal texts in Arabic based on keywords demonstrated its superior effectiveness in terms of accuracy and memorability. The proposed approach provides 87% accuracy and 80% completeness. This circumstance can significantly improve the search for legal documents, making the process faster and more accurate.

Conclusions. Our findings suggest that this approach can be a valuable tool for legal professionals and researchers to navigate the complex landscape of Arabic legal information to improve efficiency and accuracy in legal information retrieval.
Service quality assessment in IT projects based on aggregate indicators
Authors: Krasnov A. E. , Sapogov A. A.
Published: October 2024

Objectives. Due to the need for prompt and rational assessment of service quality within the framework of complex IT projects, including infrastructure servicing and maintenance, which often involve a large number of identical or similar iterations, it becomes necessary to develop novel analysis methods based on nonlinear aggregation of indicators. As a result of changes in the structure of the process, territorial remoteness, automation, informatization, and the emergence of big data, the use of existing assessment methods often becomes impossible or labor-intensive. The purpose of the present work is to develop an approach to assessing the quality of work (services) in the framework of IT projects based on nonlinear aggregation of indicators.

Methods. The proposed approach to assessing service quality within IT projects is based on nonlinear aggregation of a number of indicators involving a preliminary decomposition of the system into private indicators. In order to meet the requirements of the decomposition process, service quality indicators must fully characterize the properties of the service as a whole at the different stages of its life cycle.

Results. The application of the proposed nonlinear aggregation methodology to quality indicators obtained by decomposing the system is described with the further calculation of a single indicator that takes all the essential initial parametric indicators into account. The decomposition of complex systems to the level of elementary relationship subsystems more adequately reflects interrelated phenomena in a complex system.

Conclusions. The practical application of the neural network parametric data aggregation model for assessing the quality of IT services is demonstrated. The use of an aggregated information and analytical indicator for assessing service quality increases the availability of analytical information for decision makers, reduces the dimension of analytical data, and improves the objectivity of the obtained generalized information.
Effect of surface electromagnetic wave treatment on the refractive properties of thin films based on indium tin oxides with laser-deposited single-walled carbon nanotubes
Authors: Toikka A. S. , Kamanina N. V.
Published: October 2024

Objectives. The article investigates the effect of surface electromagnetic wave (SEW) treatment on the refractive properties of thin conducting films based on indium tin oxide (ITO) with laser-deposited single-walled carbon nanotubes (CNTs). The effective thickness of the layer of laser-deposited CNTs before and after SEW treatment is evaluated.

Methods. A laser-oriented deposition method employing a CO2 laser (λ = 10.6 µm) was used to form the structures. Diagnostics of modifications of ITO thin films were carried out using an ellipsometer operating in the spectral range of 300–1000 nm. The Cauchy model was used to describe the optical properties of K8 crown substrates and ITO thin films. To interpret the ellipsometry results of ITO modifications with CNTs, an effective-thickness virtual layer model was introduced. During post-processing of the surface, a CO2 marker (λ = 10.6 µm) was used to generate SEW. The influence of SEW treatment on the thickness of the virtual layer was assessed using ellipsometry and atomic force microscopy in contact mode.

Results. Based on the ellipsometry data, the effective thickness of the CNT layer was in the range of 24–26 nm. Following SEW treatment, the thickness of the effective CNT layer decreased to 4–8 nm, indicating the possibility of precision processing of the ITO surface with CNTs using SEW. When CNTs are deposited on an ITO surface with subsequent SEW treatment of the surface, reflection losses for p-polarized radiation are reduced. In a spectral range of 400–750 nm at an angle of incidence relative to the normal to the plane of structures α = 65°, a decrease in reflection is observed from 18.5% to 13.5% relative to ITO without CNTs and SEV treatment; at α = 71°, a decrease from 6.4% to 4.7% is observed; at α = 77°, a decrease from 1.8% to 1.2%.

Conclusions. For ITO-based thin films with laser-deposited CNTs, the described SEW treatment method provides a precise reduction in the thickness of the composite structure while preserving the antireflective properties of the CNTs. These capabilities make it possible to use the studied ITO modifications in solving problems in optical electronics, microfluidics, and biomedicine.
A Sleep Disturbance Method Using Novel Objects in the Home Cage to Minimise Stress
Authors: Egebjerg Christine , Kolmos Mie Gunni , Abelson Klas , Kornum Birgitte Rahbek
Published: October 2024

BACKGROUND: The increasing prevalence of low sleep quality is a significant issue, particularly among adolescents, necessitating a deeper understanding of its biological consequences. In sleep research, various protocols are used for sleep deprivation or disturbance, each presenting its own set of confounding factors crucial to consider.

NEW METHOD: We developed a standardized seven-day sleep disturbance (SD) protocol using daily four-hour exposures to novel objects to minimize rodent stress. Objects were selected and characterized for wake-promoting properties, and exposure timing was structured to reduce variability and enhance experimental reliability and reproducibility.

RESULTS: During the four hours of SD, the mice were efficiently sleep-deprived on the first and seventh day of SD. Thus, the selected objects efficiently sleep restricted the mice. On the first day of SD, the protocol induced sleep deprivation effect when measured over 24h, but by the seventh day, the mice recovered the sleep loss. Thus, this method is a sub-chronic sleep disturbance and not sleep deprivation. Fecal corticosterone concentrations remained unchanged during the seven days of SD.

COMPARISON WITH EXISTING METHODS: This approach reduced the risk of stress through voluntary rather than forced wakefulness. Previously, novel objects have been exchanged randomly during mouse sleep initiation causing protocol variability and very frequent disturbances. Our protocol minimizes this by introducing the novel object in a structured manner.

CONCLUSION: We effectively disturbed the sleep of the mice during seven days without inflicting substantial stress. We further demonstrate the value of validating the efficiency of an SD protocol with 24h recordings.
Стан військово-патріотичного виховання старшокласників закладів загальної середньої освіти: результати всеукраїнського опитування
Authors:   Institute of Problems on Education of the NAES of Ukraine, Kanishevska Liubov , Rahozina Victoriia ,   Institute of Problems on Education of the NAES of Ukraine
Published: October 2024

The preprint is devoted to the current state of military-patriotic education among high school students in institutions of secondary education. Based on the survey results of both high school students and teachers, the preprint highlights issues that require further reflection and cause for the reformatting of the activities of educational institutions and teachers to meet societal demands. It is intended for researchers, teachers, educators, and all professionals working in educational and cultural spheres
Implementasi Think Pair Share: Dampak Terhadap Kemampuan Analisis Matematis, Berpikir Reflektif dan Kreatif
Authors: Ambarwati Riyama , Nabila Niki Nur , Anggoro Bambang Sri , Nabila Siti Ulfa
Published: October 2024

Kompetensi dasar yang dapat dicapai oleh siswa, seperti analisis matematis, berpikir reflektif, dan kreatif, memainkan peran penting dalam mendukung proses pembelajaran. Penelitian ini bertujuan untuk mengeksplorasi bagaimana kemampuan dalam analisis matematis, berpikir reflektif, dan kreativitas memengaruhi siswa yang terlibat dalam pembelajaran kooperatif, khususnya dengan mengimplementasikan model bertipe think pair share bersama metode ekspositori. Studi ini melibatkan 63 siswa yang terbagi menjadi dua kelas, yaitu kelas eksperimen dengan 32 siswa yang menerapkan model pembelajaran kooperatif tipe think pair share dan kelas kontrol dengan 31 siswa yang menerapkan metode ekspositori. Teknik pengambilan sampel dilakukan dengan menerapkan metode cluster random sampling, dengan tes sebagai metode pengumpulan data utama. Analisis data melibatkan berbagai uji diantaranya validitas, tingkat kesulitan, daya pembeda, reliabilitas, serta uji untuk normalitas dan homogenitas. Melalui penerapan uji MANOVA untuk pengujian hipotesis, peneliti menyimpulkan bahwa terdapat dampak dari keterampilan menganalisis matematis, berpikir reflektif dan kreatif pada siswa yang terlibat dalam pembelajaran kooperatif menggunakan model pembelajaran tipe think pair share bersama dengan metode ekspositori. Siswa yang menggunakan model pembelajaran kooperatif tipe think pair share akan memiliki efisiensi berpikir lebih tinggi dan memiliki akses terhadap metode pembelajaran terkini
Epidemiologisches Profil der Syphilis in der Schwangerschaft im Bundesstaat Amapá, Amazonas, Brasilien, zwischen 2018 und 2022
Authors: Amanajás Emarine Carla Almeida , Dias Claudio Alberto Gellis de Mattos , Dendasck Carla Viana , Araújo Maria Helena Mendonça de , Fecury Amanda Alves
Published: October 2024

Syphilis ist eine sexuell übertragbare Infektion (STI), die während der Schwangerschaft zu Fehlgeburten, Fehlbildungen des Fötus, Blindheit, Taubheit, geistiger Behinderung und/oder Tod bei der Geburt führen kann. Sie gilt als ein wichtiges Instrument zur Bewertung der Qualität der pränatalen Betreuung. Ziel dieses Artikels war es, das epidemiologische Profil der Syphilis bei Schwangeren im Bundesstaat Amapá, Amazonas, Brasilien, in den Jahren 2018 bis 2022 anhand von Daten aus DATASUS zu zeichnen. Während des Studienzeitraums wurden 2.069 Fälle von Syphilis bei Schwangeren gemeldet. Es wurde ein Anstieg der Fallzahlen von 282 im Jahr 2018 auf 364 im Jahr 2019 beobachtet. Im Jahr 2020 gab es wahrscheinlich aufgrund der Pandemie einen Rückgang der Diagnosen auf 309. Das Jahr 2021 verzeichnete die höchste Anzahl an Fällen mit insgesamt 594 Meldungen, gefolgt von 2022 mit 520. Die Mehrheit der Patientinnen waren braune Frauen, hatten die Grundschule abgeschlossen und waren zwischen 20 und 39 Jahre alt. Die häufigste klinische Einstufung war die der primären Syphilis, einem Zeitraum mit hoher Wahrscheinlichkeit einer vertikalen Übertragung. Obwohl die meisten Fälle in der Stadt Macapá registriert wurden, war die Hauptstadt des Bundesstaates die einzige Hauptstadt in Brasilien, deren Syphilis-Detektionsrate bei Schwangeren niedriger war als der Landesdurchschnitt. Es wurden auch Fälle von Inseln im Bundesstaat Pará, wie Afuá, Breves und Chaves, registriert, wahrscheinlich aufgrund der Nähe dieser Gemeinden zu Gesundheitszentren in Gemeinden des Bundesstaates Amapá. Amapá verzeichnete eine Syphilis-Detektionsrate bei Schwangeren von 36,24 im Jahr 2021 und 34,52 Fällen pro 1.000 Lebendgeburten im Jahr 2022, was die vierthöchste Rate des Landes und die zweithöchste in der Region Nord war. Angesichts der Ergebnisse wird auf die Notwendigkeit von Präventionsstrategien für die gefährdete Bevölkerung sowie einer angemessenen Diagnose und Behandlung von Syphilis bei Schwangeren hingewiesen, um so die Inzidenz von angeborener Syphilis und anderen Komplikationen, insbesondere in ländlichen Gebieten, zu verhindern.
ЗАКОРДОННИЙ ДОСВІД ЗАПРОВАДЖЕННЯ КОНЦЕПЦІЙ ЛОГІСТИКИ У МЕДИЧНІЙ ГАЛУЗІ
Authors: Мельник Богдан
Published: October 2024

Дослідження присвячено вивченню зарубіжного досвіду у сфері логістичного менеджменту у медичній галузі. Актуалізовано доцільність використання принципів логістики у системі менеджменту охорони здоров’я в умовах сучасних викликів, що дає можливість оптимізувати матеріально-технічне і фармацевтичне забезпечення у медичній галузі. Визначено переваги логістизації медичної сфери шляхом оптимізації маршрутів транспортування медикаментів і пацієнтів, зменшення терміну обробки інформації, використання галузевого програмного забезпечення, удосконалення плану своєчасної доставки ліків належної якості, зменшення складських площ з метою поліпшення якісних критеріїв надання медичних послуг та зниження їх собівартості. Формалізовано напрями національної й міжнародної законодавчої бази медичної та логістичної сфери.
МЕТОДИЧНИЙ ПІДХІД ДО ТИПОЛОГІЗАЦІЇ ІННОВАЦІЙНО-ІНФОРМАЦІЙНИХ ЗМІН
Authors: Сидоров Олександр
Published: October 2024

Стаття присвячена формуванню методичного підходу до типологізації інноваційно-інформаційних змін в національній економіці. Доведено, що інноваційно-інформаційні зміни, формуючи імпульси для якісних внутрішніх перетворень в національній економіці, набувають дедалі більшого значення на сучасному етапі її функціонування. Встановлено, що в наукових дослідженнях розглядається та активно використовується типологія як засіб пізнання. Доведено необхідність розробки методичного підходу до типологізації інноваційно-інформаційних змін як специфічного об’єкта дослідження, що враховував би специфіку даного об’єкта та дозволяв визначити типи інноваційно-інформаційних змін, спираючись на існуючі дослідження науковців в сфері їх класифікації. Розроблено методичний підхід до типологізації інноваційно-інформаційних змін в національній економіці. Доповнено принципи типологізації та відібрано типологічні ознаки типологізації інноваційно-інформаційних змін. Розроблений підхід ґрунтується на дотриманні розширеного переліку принципів типологізації та дає змогу ідентифікувати із застосуванням трендового та варіаційного аналізу типи змін, у відповідності до критеріїв типологізації.
МОДЕЛІ СТРАТЕГІЧНОГО УПРАВЛІННЯ СТАЛИМ РОЗВИТКОМ ПІДПРИЄМСТВА В УМОВАХ ТУРБУЛЕНТНОГО СЕРЕДОВИЩА
Authors: Хахалєв Дмитро
Published: October 2024

У статті досліджено сучасні підходи до забезпечення стійкості підприємств у контексті мінливих зовнішніх умов. Автори розглядають турбулентність як ключовий фактор, що впливає на стратегії розвитку компаній, підкреслюючи важливість адаптивних моделей управління. Підкреслено значення аналізу ризиків та можливостей для побудови ефективних механізмів реагування на зовнішні виклики. Запропоновано різні моделі стратегічного управління, серед яких – сценарне планування, гнучкі стратегії та моделі ризик-менеджменту, адаптовані до мінливих умов ринку. У статті також розглянуто проблеми ресурсозбереження та відповідального ставлення до використання природних ресурсів, як важливого чинника у стратегії сталого розвитку. Обґрунтовано, що в умовах турбулентного середовища, підприємства мають постійно оновлювати свої бізнес-моделі, залучаючи нові підходи до управління, що дозволяють ефективно використовувати наявні ресурси.