bluuebunny/crossref_metadata_2025 huggingface dataset:
Direct tuning of soliton detuning in an ultrahigh-Q MgF2 crystalline resonator
Authors: Wang Heng , Duan Bing , Wang Kai , Wu Xing-Yu , Gao Yong-Pan , Lu Bo , Yang Daquan , Wang Chuan
Published: September 2023

The dissipative Kerr soliton combs based on microresonators have attracted wide attention due to their high coherence and on-chip integration. Meanwhile, the soliton microcombs have shown broad applications in coherent communication, on-chip low-noise microwave synthesizer, optical clock, etc. However, the performance of these applications is typically limited by their bandwidth as the precise tuning of the soliton microcombs usually relies on the thermoelectric cooler, which is slow and may increase the system’s complexity. Here, we demonstrate the observation of dissipative solitons based on the magnesium fluoride resonator with an ultrahigh-quality (Q) factor of about 927 million. The ‘power-kicking’ scheme is employed to lock and stabilize the solitons actively. Also, tuning the acousto-optical modulator allows changing the bandwidth and recoil of the solitons. This approach enables more direct and concise feedback and reduces the system’s complexity.
Evaluation of maceration, microwave, ultrasound-assisted extraction methods on free, esterified and bound phenolic profile and antioxidant activity of black rice
Authors: Rahman Md. Latifur , Mandal Subhajit , Das Priya , Ashraf Gouhar Jahan , Dua Tarun Kumar , Paul Paramita , Nandi Gouranga , Sahu Ranabir
Published: September 2023

Black rice (Oryza sativa L.) is a rich source of phenolics and anthocyanins. It was aimed to investigate the effect of different extraction methods such as conventional solvent extraction, ultrasound-assisted extraction (UAE), and microwave-assisted extraction (MAE) on antioxidant activity and phenolic profiling of black rice free, esterified, and bound phenolics fractions. Spectrophotometric methods were used to evaluate antioxidant activity and HPTLC was used for phenolics profiling. The highest content of % yield, total anthocyanin (TAC), total phenolic (TPC), and total flavonoid (TFC) contents were detected in MAE. It was also observed that antioxidant activity based on DPPH, ABTS, superoxide radical-scavenging and ferric reducing antioxidant power (FRAP) assays showed highest activity in MAE. Eight phenolic compounds were identified and quantified by a validated HPTLC method. MAE showed most abundant phenolic compounds. A significant positive correlation was established between % yield, total phenolic content, and total flavonoid content (p < 0.05) where a significant negative correlation was established between % yield, TPC, and TFC with IC50 of antioxidant activity (p < 0.05). Diverse phenolic contents and antioxidant activity were studied with different forms of phenolics with the different extraction methods. It designates that the extraction techniques had effects on the bioactive compounds as well biological properties.
Manganese doped Co3O4/rGO nanocomposite: synthesis, characterisation and visible light irradiated photocatalytic degradation of methylene blue studies
Authors: Maqsood Jawaria , Fallatah Ahmed M. , Zaki Zaki I. , Akhtar Mehwish , Irshad Amna
Published: September 2023

Visible light active, highly stable, nontoxic, and efficient photocatalysts based on 1 %, 3 %, and 5 % Mn@Co3O4 were synthesized and functionalized with reduced graphene oxide. The X-rays diffraction (XRD) spectroscopy and FT-IR spectroscopy were employed for structural and functional group studies. Under visible light irradiation, photocatalytic activities of 1 %, 3 %, and 5 % Mn@Co3O4/rGO nanocomposites were studied for the degradation of organic pollutant methylene blue. Almost 85.4 %, 90.2 %, and 93.4 % degradation of methylene blue were observed after 80 min with 1 % Mn@Co3O4/rGO, 3 % Mn@Co3O4/rGO, and 5 % Mn@Co3O4/rGO respectively. The prepared nanocomposites followed pseudo-first-order kinetic studies. Among all samples, the 5 % Mn@Co3O4/rGO showed maximum degradation of 93.4 % in 80 min. Moreover, 5 % Mn@Co3O4/rGO nanocomposite maintained its excellent dye degradation ability even after three cycles.
Chronic Deep Brain Stimulation of the Human Nucleus Accumbens Region Disrupts the Stability of Intertemporal Preferences
Authors: Wagner Ben J. , Schüller Canan B. , Schüller Thomas , Baldermann Juan C. , Kohl Sina , Visser-Vandewalle Veerle , Huys Daniel , Marx Milena , Kuhn Jens , Peters Jan
Published: September 2023

When choosing between rewards that differ in temporal proximity (intertemporal choice), human preferences are typically stable, constituting a clinically relevant transdiagnostic trait. Here we show, in female and male human patients undergoing deep brain stimulation (DBS) of the anterior limb of the internal capsule/NAcc region for treatment-resistant obsessive-compulsive disorder, that long-term chronic (but not phasic) DBS disrupts intertemporal preferences. Hierarchical Bayesian modeling accounting for temporal discounting behavior across multiple time points allowed us to assess both short-term and long-term reliability of intertemporal choice. In controls, temporal discounting was highly reliable, both long-term (6 months) and short-term (1 week). In contrast, in patients undergoing DBS, short-term reliability was high, but long-term reliability (6 months) was severely disrupted. Control analyses confirmed that this effect was not because of range restriction, the presence of obsessive-compulsive disorder symptoms or group differences in choice stochasticity. Model-agnostic between- and within-subject analyses confirmed this effect. These findings provide initial evidence for long-term modulation of cognitive function via DBS and highlight a potential contribution of the human NAcc region to intertemporal preference stability over time.

SIGNIFICANCE STATEMENTChoosing between rewards that differ in temporal proximity is in part a stable trait with relevance for many mental disorders, and depends on prefrontal regions and regions of the dopamine system. Here we show that chronic deep brain stimulation of the human anterior limb of the internal capsule/NAcc region for treatment-resistant obsessive-compulsive disorder disrupts the stability of intertemporal preferences. These findings show that chronic stimulation of one of the brain's central motivational hubs can disrupt preferences thought to depend on this circuit.
Effects of liraglutide on ANP secretion and cardiac dynamics
Authors: Luo Shenghe , Zuo Yunhui , Cui Xiaotian , Zhang Meiping , Jin Honghua , Hong Lan
Published: September 2023

To observe the effects of liraglutide (analog of glucagon-like peptide 1 (GLP-1)) on atrial natriuretic peptide (ANP) secretion and atrial dynamics, an ex vivo isolated rat atrial perfusion model was used to determine atrial ANP secretion and pulse pressure. DPP-4−/− mice were also established in vivo. ANP levels were determined by radioimmunoassay; GLP-1 content was determined by Elisa. The expression levels of GLP-1 receptor (GLP-1R), PI3K/AKT/mTOR, piezo 1, and cathepsin K were analyzed by Western blot. In the clinical study, patients with acute coronary syndrome (ACS) had low levels of plasma GLP-1 but relatively high levels of plasma ANP. In ex vivo (3.2 nmol/L) and in vivo (30 μg/kg) models, liraglutide significantly decreased ANP levels and atrial pulse pressure. Exendin9–39 alone (GLP-1R antagonist) reversibly significantly increased ANP secretion, and the reduction effect of liraglutide on the secretion of ANP was significantly alleviated by Exendin9–39. Exendin9–39 demonstrated slightly decreased atrial pulse pressure; however, combined liraglutide and Exendin9–39 significantly decreased atrial pulse pressure. Ly294002 (PI3K/AKT inhibitor) inhibited the increase of ANP secretion by liraglutide for a short time, while Ly294002 didn't counteract the decrease in pulse pressure by liraglutide in atrial dynamics studies. Liraglutide increased the expression of GLP-1R and PI3K/AKT/mTOR in isolated rat atria and the hearts of mice in vivo, whereas Exendin9–39 reversibly reduced the expression of GLP-1R and PI3K/AKT/mTOR. Piezo 1 was significantly decreased in wild type and DPP-4−/− mouse heart or isolated rat atria after being treated with liraglutide. Cathepsin K expression was only decreased in in vivo model hearts. Liraglutide can inhibit ANP secretion while decreasing atrial pulse pressure mediated by GLP-1R. Liraglutide probably plays a role in the reduction of ANP secretion via the PI3K/AKT/mTOR signaling pathway. Piezo 1 and cathepsin K may be involved in the liraglutide mechanism of reduction.
The Use of the Arm Circumference as a Measure to Detect Underweight in Individuals Aged 60 Years or Older Living in Costa Rica
Authors: Aguilar-Fernández Eduardo , Fernández-Rojas Xinia
Published: September 2023

[Objective]: This investigation focuses on the association between arm circumference and body mass index, and the estimation of cutoff values of this arm measurement for identifying low weight in Costa Rican residents aged 60 years and over. [Methods]: The study included a total of 2514 persons 60 years old or older who participated in the project “Costa Rica: Study of Longevity and Healthy Aging.” The analysis included calculation of Spearman’s correlation coefficient between arm circumference and the body mass index, the area under the Receiver Operating Characteristic (ROC) curve, and sensitivity and specificity values for measurements of arm circumference corresponding to a body mass index lower than 22 kg/m2. [Results]: The Spearman’s correlation coefficient between the body mass index and the arm circumference was 0.794 (0.774 for men and 0.806 for women). The optimum cutoff point was estimated at 26.5 cm, with a Youden’s Index of 0.7256, a sensitivity of 87.79 %, and a specificity of 84.77 %. Specific cutoff points for men and women were 26.5 cm and 25.9 cm, respectively. [Conclusions]: There is a strong relationship between arm circumference and body mass index in Costa Rican residents aged 60 years and over. A first approach was established to determine an adequate cutoff point in the measurement of arm circumference that will allow the detection of persons with low weight and greater nutritional risk in this population.
Trabajo matemático de estudiantes de educación técnica profesional en un contexto interdisciplinar
Authors: Henríquez Rivas Carolina , Verdugo Hernández Paula , Valenzuela Barrera Yocelyn
Published: September 2023

[Objetivo] La presente investigación busca caracterizar el trabajo matemático de los estudiantes de educación secundaria en formación técnica profesional (TP) que participan en una propuesta didáctica que integra aprendizajes matemáticos y de la especialidad administración. [Metodología] Se trata de una investigación de enfoque cualitativo basado en un estudio de caso que analiza el trabajo matemático en el aula de estudiantes de último año de la educación media TP. El sustento teórico considera aspectos de la interdisciplinariedad y teoría Espacios de Trabajo Matemático. [Resultados] Los resultados dan cuenta de la distancia entre los análisis previstos y lo que efectivamente realizan los estudiantes, lo que se manifiesta en la presencia del plano [Sem-Ins] por sobre los otros. Estos resultados se han organizado según el tipo de respuesta: estándar, incompleto, bloqueo o dificultad, y se han clasificado según las producciones de los estudiantes. [Conclusiones] Los resultados evidencian que la primera subtarea se ha desarrollado en el tipo estándar con activación del plano [Sem-Ins] y en una parte de ella la génesis discursiva, mientras que las siguientes subtareas corresponden a incompleto y bloqueo o dificultad, respectivamente en las que solo se observa la presencia de la génesis semiótica. Finalmente, se puede concluir que, los conceptos de la especialidad no son una dificultad al momento de ser relacionados con el trabajo matemático. Sin embargo, desde la matemática se han identificado dificultades respecto a la comunicación del razonamiento discursivo, asociados a la génesis discursiva y la lectura de gráficos, lo que sugiere la necesidad de trabajar este tipo de actividades que integren la matemática con la especialidad TP, como lo es en este caso la administración.
Prediction of flexural stiffness of wooden beams with cross-sectional loss that are reinforced with screwed steel plate based on numerical simulation
Authors: Jardim Pedro I. L. G. , Morales Elen A. M. , Panzera Túlio H. , Mascarenhas Fernando J. R. , Araujo Victor A. , Santos Herisson F. , Faustino Emerson , Almeida Diego H. , Lahr Francisco A. R. , Christoforo André L.
Published: September 2023

As a biodegradable material, wood is subject to deterioration if proper conservation techniques are not observed. Thus, several buildings, especially those of historical heritage, present pathological manifestations that can cause accidents. The interventions in these constructions must be planned to maintain the original elements and the aesthetics of the environment, with the indication of fixing additional elements in the degraded structure. The modification of the section of structural elements is commonly observed in the literature; however, few studies have been intended to analyze the effects of reinforcement in these geometrically discontinuous elements. Furthermore, the use of screwed steel plates guarantees greater ease of execution, even though it is not yet a method that has been well explored in the scientific literature. The objective of this study was to propose an equation for estimating the flexural stiffness of wooden beams with loss of cross-section that are then reinforced with screwed steel plates using a regression model. The considered variables correlated the elastic modulus of the wood and the reinforcement, the configuration of the defect, and the reinforcement. It was possible to identify that the properties of the wood and the position of the defect were variables with a significant impact on the stiffness of the reinforced beam.
Elucidation of bioactivity of tricin released by thioacidolysis from wheat straw lignin
Authors: Zhao Yunbo , Zhou Junyi , Niu Hujun , Xie Yimin
Published: September 2023

Tricin is a complex compound with chemical bonds to phenylpropane units of lignin in gramineous plants, and it is predominantly bound to lignin by β-O-4 ether bonds. Thioacidolysis cleaves the alkyl aryl ether bonds, which releases tricin from the tricin-lignin complex and maintains the natural structure of the tricin. In this study, milled wood lignin (MWL) was isolated from wheat straw by Bjӧrkman’s method, and the MWL was subjected to thioacidolysis to release tricin from the MWL. Medium-pressure preparative liquid chromatography was used for further purification. FT-IR and 1H-NMR analyses showed that the purified fraction was composed mainly of tricin-type flavonoids. The extracted tricin had strong scavenging capacity against 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radicals, with a half maximal inhibitory concentration (IC50) of 51.9 mg/L. Drug sensitivity paper testing showed that the extracted tricin inhibited the growth of Escherichia coli. The bacteriostatic circle diameters of tricin from wheat straw MWL and quercetin standard were 9.17 and 7.52 mm, respectively. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay showed that the tricin from wheat straw MWL had possible inhibitory effect on lung cancer A549 cells, with a maximum inhibitory performance of 44.5%.
Automatically Assembling a Custom-Built Training Corpus for Improving the Learning of In-Domain Word/Document Embeddings
Authors: Blanco-Fernández Yolanda , Gil-Solla Alberto , Pazos-Arias José J. , Quisi-Peralta Diego
Published: September 2023

Embedding models turn words/documents into real-number vectors via co-occurrence data from unrelated texts. Crafting domain-specific embeddings from general corpora with limited domain vocabulary is challenging. Existing solutions retrain models on small domain datasets, overlooking potential of gathering rich in-domain texts. We exploit Named Entity Recognition and Doc2Vec for autonomous in-domain corpus creation. Our experiments compare models from general and in-domain corpora, highlighting that domain-specific training attains the best outcome.
Fomepizole Therapy for Acetaminophen-Induced Liver Failure in an Infant
Authors: Pepin Lesley , Matsler Nikolaus , Fontes Andrew , Heard Kennon , Flaherty Brian F. , Monte Andrew A.
Published: September 2023

Acetaminophen overdose is common in the pediatric population. N-acetylcysteine (NAC) is effective at preventing liver injury in most patients when started shortly after the overdose. Delays to therapy increase risk of hepatotoxicity and liver failure that may necessitate organ transplant. Animal studies have demonstrated fomepizole may provide added benefit in acetaminophen overdose because of its ability to block the metabolic pathway that produces the toxic acetaminophen metabolite and downstream inhibition of oxidative stress pathways that lead to cell death. Several adult case reports describe use of fomepizole in patients at higher risk for poor outcomes despite NAC. We describe a case of a 7-month-old female who presented in acute liver failure with persistently elevated acetaminophen concentration secondary to repeated supratherapeutic doses of acetaminophen to manage fever. Fomepizole and NAC antidotes were used in the management of the patient. She fully recovered despite demonstrating multiple markers of poor outcome on initial presentation. Although randomized trials are lacking, this case suggests that fomepizole may safely provide additional benefit in pediatric patients at risk for severe acetaminophen toxicity.
Informática Empresarial en la Sede del Sur, Universidad de Costa Rica: una reseña histórica 2006-2022
Authors: Cruz Alvarado Mainor , Montero Núñez Emilio
Published: September 2023

Este artículo tiene como objetivo describir el recorrido de la carrera Bachillerato en Informática Empresarial en la Sede del Sur, Universidad de Costa Rica, desde sus inicios en el 2006, para explicar sus bases y consolidación como una carrera tecnológica que ha brindado acceso a la educación superior de calidad a los habitantes de la Región Brunca, durante el periodo entre 2006 y 2022. La actividad docente en el Recinto de Golfito de la Universidad de Costa Rica, transformado a Sede del Sur en el año 2019, tuvo sus inicios en el año 2006, precisamente con la oferta de la primera generación de la carrera bachillerato en Informática Empresarial.  Desde entonces, se han graduado 88 estudiantes que aportan al crecimiento tecnológico del país. Posteriormente, se determinan retos a través de los datos encontrados que permitirían seguir profundizando en un análisis de la población estudiantil con el propósito de recabar información que facilite la toma de decisiones para el desarrollo de la carrera. Para ello se vislumbra la realización de un estudio sociodemográfico de la población en cuestión, así como de la población graduada con el fin de determinar los aprendizajes adquiridos y obtener realimentación que pueda servir para la actualización de la carrera.
Agony to Enlightenment: Parallels between Rafael Lechowski’s Quarcissus and T.S. Eliot’s Four Quartets
Authors: Saravia Vargas Juan Carlos , Saravia Vargas José Roberto , Delgado Solano Daniel
Published: September 2023

Eliot’s Four Quartets stands as one of the most influential poetic works of the 20th Century. Therefore, academics have approached it from many different angles, among which one may mention its musicality, the references it contains, its composition, and the belief systems that converge in it, such as Christianity, Hinduism, and Buddhism. Rap music, on the other hand, is generally assumed to be a cultural product that lacks profound insights on the subjects it touches upon precisely because it is built for entertainment, not academic analysis. However, although rap music is generally regarded as non-academic, Rafael Lechowski’s extensive rap work entitled Quarcissus: El arte de desamar has divided criticism because of the way in which it engages with the subject of emotional pain. This article argues that Lechowski’s work shares both structural and content features with Eliot’s Four Quartets; particulary regarding Buddhist principles, which is established by comparing the four sections that make up both texts.
¿Estereotipos femeninos sexuales?: Una relectura del discurso catuliano hacia las mujeres a partir de las pruebas por persuasión aristotélicas
Authors: Salas Moya Jenny
Published: September 2023

En este artículo se analiza, a partir de las pruebas por persuasión aristotélicas o písteis, ēthos, páthos y lógos, el tratamiento de Cayo Valerio Catulo, poeta romano del siglo I. a.C., hacia las mujeres cuyas conductas sexuales no siguen los lineamientos establecidos por la palabra dada (fides) y el pudor (pudicitia) romanos. Se propone que la relación entre autoridad y autoría presentes en la significación de la auctoritas permite establecer un vínculo entre la retórica, la violencia simbólica y la composición literaria poética. De las písteis aristotélicas analizadas en el poemario catuliano, el ēthos se presenta como la prueba más recurrente. Por medio de la censura o el vituperio se presentan estereotipos femeninos, especialmente de tipo sexual contra las mujeres.
Dual fuzzy logic PID controller based regulating of dc motor speed control with optimization using Harmony Search algorithm
Authors: Khather Salam Ibrahim , Ibrahim Muhammed Abduljaleel , Ibrahim Mustafa Hussein
Published: September 2023

This paper discusses the implementation of a Proportional-Integral-Derivative (PID) controller for regulating the speed of a closed loop four quadrant chopper fed DC motor. The PID controller is combined with a Dual Fuzzy Logic Controller to form a DFPID controller for enhancing the performance of speed control of the DC motor. The DFLC is optimized using a metaheuristic algorithm known as Harmony Search Algorithm (HSA). The major aim of this research is to gain an effective control over the speed of the motor in the closed loop environment. For achieving this, the parameters for the DFPID are selected through time domain analysis which aims to satisfy the requisites such as settling time and peak overshoot. Initially, the fuzzy logic controller in the DFPID controls the coefficients of the PID achievement gain an effective control over the system error and rate of error change. Further, the DFPID is improved by the HAS for obtaining a precise correction. The solutions obtained by tuning the DFPID controller are evaluated from simulation analysis conducted on a MATLAB/SIMULINK platform. The closed loop performance is analyzed in both time and frequency domain analysis and the performance of DFPID is optimized using the HSA algorithm to obtain precise value of the control process. As observed from the Simulation analysis, the DFPID-HSA generates optimized control signals to the DC motor for controlling the speed. The performance of the intended speed control approach is analyzed in terms of different evaluation metrics such as motor speed, torque and armature current. Experimental outcomes show that the proposed approach achieves better control performance and faster speed of DC motor compared to conventional PID controllers and SMC controllers
Determining the tension of complex chemical threads during interaction with guide surfaces
Authors: Shcherban Volodymyr , Kolysko Oksana , Melnyk Gennadij , Shcherban Yury , Ishchenko Valentin
Published: September 2023

This paper reports a study to determine the tension of complex chemical threads made of Kevlar, carbon, polyethylene, and meta-aramid when interacting with the working bodies of knitting machines in the process of forming technical knitwear. An increase in tension after the guide surface of the working body due to a change in the value of the friction forces in the contact zone was established. It has been proven that the tension of the selected complex chemical threads after the guide surface of the working body is affected by the tension of the thread in front of the guide surface of the working body of the knitting machine. Also, the amount of tension is affected by the radius of curvature of the cylindrical guide surface of the working body and the angle of thread coverage of the guide surface of the working body of the knitting machine. This has made it possible to determine thread tension even at the initial stage of designing the technological process of thread processing on knitting machines, during the production of technical knitwear. On the basis of experimental studies for Kevlar, carbon, polyethylene, and meta-aramid complex threads, regression dependences of the stress after the cylindrical guide surface of the working body of the knitting machine were constructed. The analysis of regression dependences made it possible to establish the value of the radius of curvature of the guides when the tension of complex chemical threads before the knitting zone on knitting machines would take a minimum value. This will minimize the stress on complex threads during their processing.
So, there are reasons to assert the possibility of directed regulation of the process of changing the tension of Kevlar, carbon, polyethylene, and meta-aramid complex threads during the formation of technical knitwear on knitting machines by selecting the value of the geometric parameters of the guides
Development of a technology for the production of germinated flaxseed using plasma-chemically activated aqueous solutions
Authors: Kovaliova Olena , Vasylieva Natalia , Stankevych Serhii , Zabrodina Inna , Mandych Oleksandra , Hontar Tatyana , Haliasnyi Ivan , Kotliar Oleh , Yanchyk Oleksandr , Bogatov Oleg
Published: September 2023

The result of the research is the development of a technology for the production of germinated flaxseed using plasma-chemically activated aqueous solutions. The object of research was flaxseed. An urgent technological problem is the intensification of the bioactivation process of flaxseed and its effective disinfection. The expediency of using plasma-chemically activated aqueous solutions as an intensifier of the process of flaxseed germination and an effective disinfectant of food raw materials was experimentally proven. It is shown that the use of plasma-chemical activation of process solutions not only accelerates flaxseed germination, but also contributes to a more active accumulation of biologically valuable components in flax raw materials. The composition of flaxseed as a raw material derivative was analyzed. Germinated flaxseed, which is considered a high-value component of food products, was studied separately. An increase in the moisture content of flaxseed during the soaking process by 0.7–1.7 % was recorded. Seedling development increases by 2–9 mm. The germination energy and capacity increase by 5–12 %. The biomass of germinated seeds increases by 39–56 %. In the process of germination, the content of proteins in flaxseed increases from 21.88 to 23.71 %, reducing sugars from 2.37 to 4.02 %. The total content of amino acids increases from 3.64 to 10.38 % compared to the control, and 10 times compared to the raw material. A significant accumulation of vitamins was noted: B1, B2, B3, B5, B6, B7, B9, C, E. In addition, plasma-chemically activated solutions effectively disinfect germinated flaxseed.
The technology can be applied in the production of enrichment components of food products. The developed technology will receive special attention in the production of functional food products
Constructing geometrical models of spherical analogs of the involute of a circle and cycloid
Authors: Nesvidomin Andrii , Pylypaka Serhii , Volina Tatiana , Kalenyk Mykhailo , Shuliak Ivan , Semirnenko Yuriy , Tarelnyk Nataliia , Hryshchenko Iryna , Kholodniak Yuliia , Sierykh Larysa
Published: September 2023

The common properties of images on a plane and a sphere are considered in the scientific works by scientists-designers of spherical mechanisms. This is due to the fact that the plane and the sphere share common geometric parameters. They include constancy at all points of the Gaussian curve, which has a zero value for a plane and a positive value for a sphere. Figures belonging to them can slide freely on both surfaces. With unlimited growth of the radius of the sphere, its limited section approaches the plane, and the spherical shape transforms into a plane. Thus, a loxodrome that crosses all meridians at a constant angle is transformed into a logarithmic spiral that intersects at a constant angle the radius vectors that come from the pole. The tooth profile of cylindrical gears is outlined by the involute of a circle. A spherical involute is used for the corresponding bevel gears. Other spherical curves are also known, which are analogs of flat ones.
The formation of a cycloid and an involute of a circle are associated with the mutual rolling of a line segment with each of these figures. If the segment is fixed and the circle rolls along it, then the point of the circle describes the cycloid. In the case of a stationary circle along which a segment is rolled, the point of the segment will execute the involute. To move to the spherical analogs of these curves, it is necessary to replace the circle with a cone, and the straight line with a plane. The spherical prototype of the cycloid will be the trajectory of the point of the base of the cone, which rolls along the plane, that is, along the sweep of the cone. The sweep of a cone is a sector, the radius of the limiting circle of which is equal to the generating cone. If this sweep, like a section of a plane, is rolled around a fixed cone, when its top coincides with the center of the sector, then the point of the limiting radius of the sector will execute a spherical involute. This paper analytically implements these two motions and reports the parametric equations of the spherical analogs of the circle involute and the cycloid
Identifying the influence of expanded clay concrete based on a binder from phosphorus slag on the strength of structures from leaked concrete
Authors: Keles Bakirov , Sagybekova Akmaral , Bakhytzhan Abiyev , Karashina Ainash , Nurakhova Akmaral
Published: September 2023

The paper presents the results of experimental studies of concrete and compressed reinforced concrete elements from cementless claydite-concrete. An experimental study of reinforced concrete elements with central and eccentric application of forces was carried out to determine their increased sensitivity. The construction material is cementless expanded clay concrete, obtained by a mixture of finely divided granular electrothermophosphorus slag. The tests were carried out on reinforced concrete compressed elements with central and eccentric application of longitudinal force to determine their bearing capacity. According to the test results, the strength and deformation properties of new concrete on a glass-slag binder and the calculation of reinforced concrete structures are checked.
The selection of compositions of glass-slag claydite-concrete of various grades has been made. The use of concrete with a clinker-free binder in construction makes it possible to reduce the need for a scarce building material – cement.
Studies of the physical and mechanical properties of glass-slag expanded clay concrete grades M50+M150 with a bulk density of 1,000–1,400 kg/m3 were carried out under a short-term static load. At the same time, the strength and deformation properties of glass-slag expanded clay concrete were studied under short-term action of compressive and tensile loads.
The use of any new building material must be preceded by a comprehensive study of it – determination of its strength properties, study of concrete in the structure under load, etc.
Building codes and regulations are adopted for the standard construction material, the properties of aggregates are not taken into account. Our studies show that the properties of fillers increase the strength properties of the structure when using claydite concrete on a glass-slag binder in reinforced concrete structures
Development of hybrid intrusion detection system based on Suricata with pfSense method for high reduction of DDoS attacks on IPv6 networks
Authors: Praptodiyono Supriyanto , Firmansyah Teguh , Anwar Muhamad Haerul , Wicaksana Cakra Adipura , Pramudyo Anggoro Suryo , Al-Allawee Ali
Published: September 2023

Distributed Denial of Service (DDoS) attacks is a problem in computer networks. DDoS attacks pose a significant threat to internet networks as they cause congestion and disrupt the optimal functioning of servers. Detecting the source of these attacks is essential for effective protection. Therefore, in this study, we propose a hybrid strategy that combines Suricata, an intrusion detection system (IDS), with pfSense, a firewall, to address DDoS attacks. Suricata, the IDS, can identify the destination of the attack, which allows pfSense, the Firewall, to block the attack by dropping packets sent by the attacker. As a result, by leveraging this combined approach, we have observed significant improvements in the quality of service (QoS). The results of our study indicate a 1.08 % increase in throughput value, from 1881.97 bytes to 902.44 bytes, demonstrating improved efficiency in data transmission. Additionally, we observed a 57.32 % increase in the average total number of packets sent, from 1382 packets to 3238 packets, indicating better network performance. Furthermore, the proposed strategy significantly reduced delay and jitter values. The delay value decreased by 88.78 %, from 90.76 ms to 10.18 ms, and the jitter value decreased by 88.99 %, from 181.85 ms to 20.03 ms. These improvements signify a notable reduction in latency and packet timing variations, leading to a smoother network experience. Another crucial aspect we evaluated was the CPU utilization. The proposed strategy resulted in a substantial decrease in CPU utilization by 81.23 %, from 78.3 % to 14.7 %. The combination of pfSense and Suricata has proven to be a successful approach, providing robust protection against DDoS attacks, including those utilizing IPv6. This research can be implemented as a solution on a campus ad-hoc network with limited computers
Improving the technology for processing the aggregated data flow of a secure corporate multiservice communication network
Authors: Berkman Liubov , Zakharzhevskyi Andrii , Lavrinets Kostiantyn
Published: September 2023

This paper considers the process of dynamic reservation of the channel resource of a secure corporate multi-service communication network.
It has been established that the processes of building and functioning of the schemes of a secure corporate multi-service communication network and improving the quality of the implementation of its main work processes involve the evaluation and dynamic reservation of channel resources for incoming aggregated data flows of the network.
The model of dynamic reservation of the channel resource of the aggregated data stream of the secure corporate multi-service communication network was built and proposed. The proposed model makes it possible to set the quantitative values of the reserved channel resource for different service methods depending on the number of component flows in the total aggregated data flow of the VPN tunnel.
It was established that an increase in the density of the aggregated data stream requires an increase in the reserved channel resource. At the same time, its value is influenced by the way of servicing the aggregated data flow in the VPN tunnel of the secure corporate multi-service communication network. Application of the isolated service method gives a gain in the allocated resource for the channel reserve from 10 to 20 percent compared to the group service method for IR and video telephony. This is due to the more flexible management process of the border router's incoming data storage buffer under the isolated service mode.
The model of dynamic reservation of the channel resource of the secure corporate multi-service communication network reported in this paper could be used in the improvement of existing and development of new structures of the secure corporate multi-service communication network. The consequence of such an improvement is a reduction in the delay time for the processing of incoming data packets in the specified network
Improving the storage technology of persimmon fruit (Diospyros kaki L.) In the refrigeration chamber
Authors: Omarov Yashar , Gurbanova Sevda , Babayeva Ulduz , Gasimova Afet , Heydarov Elnur , Gasimova Gultakin , Nabiyev Ahad
Published: September 2023

Persimmon fruits (Diospyros kaki L.) attract the attention of researchers due to their high nutritional and medicinal value. The composition of persimmon is rich in nutrients. The object of research is the storage technology of persimmon. Fully ripe persimmon varieties Khachia and Khiakume were used as research material. If the activity of enzymes is inhibited or reduced during refrigerated storage using a controlled gas environment, then the consumption of nutrients for respiration will decrease, and the fruits will retain their original appearance. The persimmon varieties used were stored in refrigerators for 5 months in five variants. In persimmon fruits of both varieties, quantitative changes in the main indicators during refrigerated storage were studied. The regularities of changes in the activity of enzymes of the oxidoructase class depending on the composition of the controlled gas medium and the content of phenolic compounds were considered.
As a result of the analyzes, a rational regime for storing persimmon varieties in a refrigerator under CGE conditions with a gas composition of 3–4 % CO2 and 2–3 % O2, a temperature of ‒2...–3 °C and an air humidity of 90–95 % was determined. During the storage period, the activity of all enzymes, except for ascorbate oxidase, completely ceased (except for the catalase enzyme in the Khachia variety). During long-term storage of the Khachia variety in a refrigerator, the activity of the enzyme ascorbate oxidase decreased by 94 %, o-diphenol oxidase and peroxidase decreased by 100 %, catalase by 95.5 %. Ascorbate oxidase activity decreased by 94.5 % in persimmon fruits of the Khiakume variety, and the activity of other enzymes was completely inhibited. To achieve this result, it is important that the activity of oxidoreductases decreases or passes into an inhibitory state. The results make it possible to regulate the quality indicators of persimmon varieties depending on their storage modes and use them to provide people with fresh fruits not seasonally but for a long time
Improving the operational efficiency of control centers for emergency events by using GIS technologies
Authors: Yemelyanenko Sergiy , Kuzyk Andriy , Ivanusa Andriy , Behen Danyil , Koval Roman , Morshch Yevhen
Published: September 2023

The object of the study is the functioning of control centers during emergencies.
Ukraine has faced large-scale emergency events caused by Russian aggression. The experience of crisis management in emergency events showed the need to find new solutions and improve the activities of emergency management centers at the State Emergency Service of Ukraine and GIS technologies in decision-making support systems.
The curent paper has formulated a conceptual model of the work of emergency management centers at the Emergency Service of Ukraine; based on it, their main functions were formed. Identification of risks for objects that carry potential danger was carried out and a block diagram of object risk assessment was developed to improve the work of emergency control centers at the State Emergency Service of Ukraine. An approximate list of software and online resources for the operation of emergency management centers at Emergency Service of Ukraine is provided, which makes it possible to summarize the risks that are present in the given territory, isolate them, and pay special attention to prevent possible consequences from them.
Based on the computer software MARPLOT, CAMEO, and ALOHA, an example of response to an emergency event was described. In this case, the weather conditions, physico-chemical parameters of the dangerous substance, and the radii of the danger zones of its distribution and the number of people who need to be evacuated were taken into account. In practice, having this knowledge, a head of the emergency management center at the State Emergency Service of Ukraine will be able to effectively manage people without exposing them to danger, as well as conduct timely evacuation. The use of these programs makes it possible to reduce the time of hazard assessment and visualize them, which creates advantages over the existing methodology of the State Emergency Service of Ukraine in terms of speed of hazard assessment.
The results have made it possible to solve the problem of increasing the efficiency of the emergency management centers at the Emergency Service of Ukraine and to create the prerequisites for building a geo-information portal that could combine various methods and techniques on one platform
Devising an approach to safety management of vessel control through the identification of navigator’s state
Authors: Nosov Pavlo , Koretsky Oleksiy , Zinchenko Serhii , Prokopchuk Yurii , Gritsuk Igor , Sokol Ihor , Kyrychenko Kostiantyn
Published: September 2023

The object of this study is the processes of automated management of maritime safety by analyzing the manifestations of the human factor of sea navigators.
The task solved is justified by the need for formal and logical analysis and intelligent identification of mental motivational states (MMS) of marine navigators whose actions can cause dangerous situations during the control of the ship’s movement. High accident rates due to the fault of the navigators, in the absence of automated means of monitoring their condition, cause a contradiction between the existing means of safety control in controlling the movement of the vessel and the modern requirements of navigation, which needs to be resolved.
A safety management approach was devised that takes into account the specificity of navigational tasks and the p-adic classification of dangerous MMS for navigators. This has made it possible to create three security modes that are activated depending on the detected state of the navigator’s MMS.
Features of the results are the combination of analysis by means of p-adic systems and intelligent methods of data processing. As a result, sufficient identification accuracy was obtained for more than 75 % of MMS through neural network training.
Experimental data collected during the navigation watch, as well as on the Navi Trainer 5000 navigation simulator (Wärtsilä Corporation, Finland), became the basis for simulation by means of neural networks. In turn, the training of neural networks made it possible to obtain sufficient identification accuracy by performing up to 3000 iterations. Overall, the learning rate of the neural network was 0.98, which indicates a high level of identification.
From a practical point of view, the results could be used for the automated management of shipping safety, as well as for evaluating the level of adaptation of the navigator to dynamically changing conditions. The proposed approach provides opportunities for the application of modern intelligent technologies in the field of maritime transport safety, namely artificial neural network tools that determine notification modes or activation of automatic ship traffic control modules.
The specified contradiction requires the design of specialized systems for automated safety management of ship traffic control based on the identified states of navigators
Improving the efficiency of symbolic execution by clustering the input data based on the complexity of test generation
Authors: Bazylevych Roman , Franko Andrii
Published: September 2023

The object of research is means to increase computational effectiveness for automatic unit test generation process. It provides arguments for developing new method to achieve wider use of symbolic execution in commercial software development. The main task of the research is to create adaptive code clustering method that considers test generation complexity for structural source code elements and available computational resources that will increase effectiveness of computations. It is achieved by estimating test generation complexity and balancing the it for produced clusters during clusterization. As a result, proposed clustering method is adaptive to hardware and source code variability. It is shown that developed approach provides up to 30 % increase in computation effectiveness compared to clustering based on code structural properties alone for selected samples and up to 250 % in separate cases. This is caused by balanced estimated test generation complexity within generated clusters. It limits path explosion to expected levels that match computational resources for every cluster. Estimate of test generation complexity makes it possible to stop the computation when the spent time exceeds the corresponding complexity limit. Consequently, it makes it possible to prevent performing unnecessary computations. Proposed method makes it possible to use symbolic execution in commercial software development due to higher adaptability for source code and hardware variations. It will allow to reduce expenses on early-stage software testing and provide means for determining feasibility of symbolic execution for commercial projects
Development of the method of general interpolation for Z-number-valued if-then rules
Authors: Jabbarova Konul , Rzayeva Ulviyya , Jabbarova Aynur
Published: September 2023

Rule interpolation-based methods are used when the rule base is sparse. This frequently being the case, as information relevant to real-world problems is not usually comprehensive. At the same time, relevant information is often characterized by both fuzziness and partial reliability. To deal with such kind of information, the concept of Z-number was introduced by Zadeh. This paper is devoted to an extension of the general interpolation method for fuzzy rules to the case of if-then rules with Z-number-valued antecedents and consequents. The proposed approach relies on the determination of the distance between the current observation vector and vectors of rules antecedents. By determining the distance between the current vector and the antecedents of the rules, decisions can be made based on the nearest antecedents. In this context, rule antecedents are vectors that represent certain conditions. The resulting output is computed as a weighted sum of rules consequents. Weighting factors are used to account for the importance of each rule in the interpolation. Weights of interpolations are found on the basis of mentioned distance values. The results of this study are aimed at developing an approach to decision-making in terms of Z-valued information. The method is characterized by relatively low computational complexith. Regarding the application of the proposed approach, the job satisfaction evaluation problem is considered. Consequently, the obtained results confirm the efficiency of the proposed approach. The proposed method can be a useful tool for decision-making in various applications, especially where high computational complexity is unacceptable or impractical