bluuebunny/crossref_metadata_2025 huggingface dataset:
Accounting for Uncertainty
Authors: Penman Stephen
Published: December 2023

In accordance with the theme of the Yuri Ijiri lectures, I focus on something foundational to accounting: the communication of uncertainty through accounting numbers. I do so in the context of providing information to investors about “the amount, timing, and uncertainty of future cash flows”, an objective of accounting standard setters (with emphasis added). I outline accounting principles that convey uncertainty and discuss the implications for a financial statement analysis that extracts information about uncertainty. I also show how accounting-based valuation is modified to incorporate that information. Asset pricing in finance deals with risk and uses accounting numbers to do so. I explain how that endeavor might be improved by recognizing the accounting for uncertainty. That puts accounting and finance on the same platform. Finally, I address normative issues of accounting policy for conveying information about the uncertainty of future cash flows.
High-pressure/high-temperature synthesis of the first walstromite-analogue borate Tm2CrB3O9
Authors: Teichtmeister Tobias A. , Schwarzmüller Stefan , Wurst Klaus , Heymann Gunter , Huppertz Hubert
Published: December 2023

Tm2CrB3O9 was obtained by high-pressure/high-temperature syntheses at 7.5 GPa and 850 °C. The compound crystallizes homeotypically to walstromite in the triclinic space group

P

1
¯

$P\overline{1}$

(no. 2) with the unit cell parameters a = 5.9118(4) Å, b = 5.9148(4) Å, c = 8.3575(6) Å, α = 83.64(1)°, β = 71.19(1)°, and γ = 79.93(1)°, and two formula units per cell. Single-crystal and powder diffraction data are accompanied by an infrared spectroscopic investigation and the structural features of this new compound are discussed in detail.
Potential Of The Novel START Index In Assessing Arterial Stiffness In Patients With Coronary Artery Disease
Authors: Sumin Aleksey N. , Shcheglova Anna V. , Gorelova Irina V. , Fedorova Daria S.
Published: December 2023

Background — Recently, a novel method for assessing arterial stiffness was developed under the name of START (STiffness of ARTeries), which, unlike the conventional stiffness parameter β, is calculated based on other physical principles. Our study aimed to investigate the possibility of using the new START index in patients with coronary artery disease (CAD). Methods — The study included 353 patients with CAD: 277 men and 76 women. Their median age was 57.0 (53.0; 64.0) years. The arterial stiffness was assessed in all subjects using VaSera VS-1000 sphygmomanometer. The novel arterial stiffness index (START) was analyzed retrospectively. We assessed the correlation of cardio-ankle vascular index (CAVI) and START index, as well as each of these indices with risk factors in the entire cohort of those examined, and also separately for men and women. Results — In examined CAD patients, the median value of the CAVI was within the borderline values (8.0-9.0) [5]: 8.3 (7.6; 9.2) on the right side and 8.3 (7.6; 9.2) on the left side. A median value of the START index was 8.3 (7.1; 9.8) on the right and 8.1 (7.0; 9.6) on the left. A strong relationship between CAVI and START was revealed in the total sample (r=0.879, p<0.001). Women exhibited a more pronounced association (r=0.982, p<0.001) than men (r=0.805, p<0.001). For the total sample, we revealed a strong dependence of the indices on age (r=0.4, p<0.001 for CAVI; r=0.36, p<0.001 for the START index). Both stiffness indices exhibited a weak but significant correlation with glomerular filtration rate (GFR) in the entire sample of study subjects (r=-0.168, p=0.003 for CAVI; r=-0.0159, p=0.004 for START). Conclusion — In patients with CAD, the START index was strongly associated with the CAVI throughout the entire cohort, albeit the correlation in women was slightly stronger than in men. Also, these indices had similar associations with clinical factors and age. Strong correlation between these indices is important for the subsequent practical application of the START index. The possibility of using START index in similar clinical situations as the CAVI requires confirmation in further studies.
Лингвистический анализ проповеди Govorenije na mladoij misi из фонда Берчич
Authors: Petešić Šušak Ivana , Hadžihalilović Sandra
Published: December 2023

Проповедь Govorenije na mladoij misi – одна из ру-кописей, принадлежащих Фонду глаголических тек-стов, – Фонду Берчич (фонд 67). Этот фонд хранитсяв Санкт-Петербурге, в Российской национальной би-блиотеке. Данное собрание рукописей является самымкрупным за пределами Хорватии, оно состоит из более80 единиц, большинство из которых – проповеди. Однаиз них – это Govorenije na mladoij misi (Фонд Берчич 67,рукопись 38), в каталог собрания она включена под на-званием Prva propovijed mladog svećenika (Первая про-поведь молодого священника), написана в XVIII векекурсивной глаголицей. Хотя время создания текстаопределено, автор остается неизвестным, что осложняетидентификацию места записи проповеди. Наша задачазаключается в том, чтобы с помощью анализа графики,а также языка текста установить место написания про-поведи. Таким образом, исследуя эту проповедь, мы од-новременно дополним не только имеющиеся сведенияо хорватском языке XVIII в., но и знания о хорватскомглаголическом курсиве как о письме, которым было на-писано большое количество текстов с XIV по XIX вв.Некоторые из них еще не исследованы.
Od vjerodostojnosti dokumenta do mistifikacije
Authors: Vojvodić Jasmina
Published: December 2023

Prikaz knjige Mistifikacija u slavenskoj kulturi: poetika i prakse (Mistifikacija v slavjanskoj kul'ture: poètika i praktiki), ur. N. Zlydneva. Moskva: Institut slavjanovedenija RAN, 2023., 420 str.
Eskrim Sporcularında Sağlıklı Beslenme Tutumları ile Uyku Kalitesinin Spor Performansı Açısından Değerlendirilmesi
Authors: DOĞRUYOL Övgü , OKBURAN Gözde , DOĞRUYOL Sena
Published: December 2023

Bu araştırmanın temel amacı; eskrim sporcularının sağlıklı beslenmeye ilişkin tutumları ve uyku kalitelerinin spor performansları üzerindeki etkisini incelemektir. Araştırma, Mersin İl’inde aktif sporcu olan eskrim sporcuları ile yürütülmüştür. Araştırmaya 12-18 yaş aralığında (24 kız ve 26 erkek) olan toplam 50 eskrim sporcusu dahil edilmiştir. Katılımcıların sağlıklı beslenme tutumları “Sağlıklı Beslenmeye İlişkin Tutum Ölçeği” ile, uyku kaliteleri “Uyku Kalitesi ve Uyku Değişkenleri Ölçeği” ile, spor performansları ise “Dikey Sıçrama Testi” ile değerlendirilmiştir. Sonuçlar, eskrim sporcularının sağlıklı beslenmeye ilişkin tutumları alt boyutlarından beslenme hakkında bilgi, olumlu beslenme ve kötü beslenme ile uyku kalitesi arasında anlamlı ilişkiler olduğunu göstermektedir (p<0,05). Sporcuların dikey sıçrama puanları incelendiğinde, sporcuların dikey sıçrama performanslarının uyku kalitelerine göre farklılaşmadığı tespit edilmiştir (p>0,05). Ayrıca, sporcuların dikey sıçrama performanslarının olumlu beslenme alışkanlıklarından anlamlı düzeyde etkilendiği saptanmıştır (p<0,05). Sonuç olarak, mevcut çalışma ile eskrim sporcularının sağlıklı beslenmeye ilişkin tutumları, uyku kaliteleri ve fiziksel performansları arasındaki ilişkilerin birlikte ele alınarak açıklanmasının literatüre önemli katkılar sağlayacağı düşünülmektedir.
ATIVIDADE ECTOPARASITICIDA DE UMA NOVA FORMULAÇÃO (BENZOILFENILUREIA + ORGANOFOSFORADO) EM BOVINOS
Authors: HARDT I. , GOMES L. V. C. , MELO D. P. , BUZZULINI C. , FELIPPELLI G. , ZUANAZE M. A. F. , TOMA S. B. , SOARES V. E. , COSTA A. J.
Published: December 2023

Os ectoparasitos Rhipicephalus microplus, Dermatobia hominis e Haematobia hominis constituem grande entrave à produtividade pecuária, fator agravado, sobretudo, pela aquisição de resistência medicamentosa a muitos princípios ativos. Com o objetivo de minimizar esse fenômeno, foram conduzidos quatro estudos clínicos com uma inédita formulação (benzoilfeniluréia + organofosforado). Para avaliação da atividade anti-ixodídica foram realizados ensaios com bovinos naturalmente e experimentalmente infestados. No primeiro, o índice de eficácia carrapaticida foi superior a 90% do 7º ao 28º DPT (Dias pós-tratamento). No “Stall test” (infestações artificiais), índice máximo de eficácia (100%) foi alcançado do 20º ao 47º DPT. A atividade mosquicida da nova formulação contra Haematobia irritans (infestação natural) manteve-se superior a 90% do 1º ao 14º DPT. Sobre larvas de Dermatobia hominis, observou-se efetividade superior a 90% do 7º ao 21º DPT. Pelos resultados obtidos nos quatro estudos realizados, pode-se recomendar a inédita formulação, na dose e via empregadas, no tratamento e controle de parasitos externos de bovinos.
TÉCNICA CIRÚRGICA DE PLATE-ROD EM FILHOTE CANINO COMO TRATAMENTO PARA FRATURA DIAFISÁRIA FEMORAL
Authors: KLINGER B. A. R. , OLIVEIRA S. L. , COSTA C. C. , NOGUEIRA L. A. N.
Published: December 2023

As fraturas femorais são comuns em cães e gatos após traumas significativos e normalmente não podem ser tratadas de forma não invasiva. Eles requerem intervenções cirúrgicas internas. Vários sistemas de implantes são empregados para corrigir essas fraturas, incluindo placas ósseas, hastes intramedulares, combinações de placas e hastes, parafusos interfragmentários, pinos, fios e fixadores externos. No entanto, um profundo conhecimento da anatomia, fisiologia da fratura, técnicas de diagnóstico e tratamentos cirúrgicos é crucial para garantir uma recuperação eficaz do membro afetado e um prognóstico favorável para o paciente. Neste relato de caso, uma cadela sem raça definida, com 8 meses de idade, foi levada ao Hospital Veterinário (UNICEP) após sofrer trauma no membro posterior direito. Foram realizados exames de sangue e radiografias para determinar o tipo de fratura e a abordagem cirúrgica mais adequada. A radiografia revelou fratura espiral completa e simples localizada no terço proximal da diáfise do fêmur direito. O procedimento cirúrgico escolhido envolveu a combinação de pino intramedular e placa bloqueada, abordagem frequentemente utilizada na osteossíntese de fraturas de fêmur devido à sua eficácia comprovada. A sincronização entre a placa e o pino intramedular permite a neutralização das forças biomecânicas, evitando complicações.
The Effect of Institutional Quality on Economic Growth: Evidence from Tripartite Approaches in the Context of War-Torn Countries
Authors: Aden Dirir Sadik
Published: December 2023

This paper is undertaken to investigate the role of institutional quality in proportion to the economic growth of war-torn countries during the last 20 years. Within this framework, the paper employed three different models to investigate the link that exists between good governance indicators and economic growth. According to the results, the long-run PMG model indicated that political stability and regulatory quality increase war-torn countries’ economic development. Contrarily, it has been demonstrated that the situation of law and corruption in these countries reduces economic growth. Neither the long-term nor short-term estimations from the MG and DFE models showed any noteworthy results. Next, the FMOLS and DOLS revealed that political stability, voice and accountability have a favorable effect on the economic development of these nations. On the other hand, these nations’ regulatory standards had a very detrimental impact on economic growth. Lastly, the fixed-effects model showed that a 1% improvement in these nations’ political stability will result in a 4.5% increase in GDP. This research will aid managers, academics, and policymakers in determining the course of actions needed in their areas of specialization or nations of interest to ensure economic growth and put in place an effective institutional framework through enforced supervision.
Origins and social meanings of algorithmic culture
Authors: Petulla Luciano
Published: December 2023

The social sciences have much to say about the cybernetic turn our lives have taken thanks to the use and intermediation of software applications spread through the Internet. The book Algorithmic Culture before the Internet by Ted Striphas takes the burden of explaining with originality and expertise the deep cultural history of this epochal turn, offering us useful reflections to interpret and make sense of the current expansion of our relations with the mechanic world.
Citizen training at the university: a documentary analysis of the university didactic planning
Authors: Balcarce Gianina Dávila
Published: December 2023

Citizen education seeks to prepare individuals for democratic life. One of the main topics that is necessary to address in citizen education is the concern for the shaping of identity or individual subjectivity, which implies cultural and historical transactions. In this study, it was analyzed how Citizen Education was handled by a university through the documentary review of the curricular activity programs of four undergraduate programs. The analysis reveals that the didactic sequence of the purposes linked to citizenship is neglected, since there is a weak or null link between purposes-methodology and evaluation in the planning.
Generalizations and impositions: redefining the Andean
Authors: Quiroz Chambilla Pablo Rodrigo
Published: December 2023

The Andes have been a melting pot of cultures, myths and traditions rooted in the richness of their past human interactions and manifestations. However, in this sense, the "Andean" emerges as a concept that has evolved as history and anthropology have challenged and redefined the perception of this region. That is why this article dives into this term, through an analysis, with special emphasis on four points that allow a review and evaluation of how to interpret the Andean from historical anthropology: the stereotypes imposed by society, the geographical boundaries as conditioning factors, and the legacy of the colony and government policies that respond to an agenda. It is pertinent to practice a reflective look through which we seek to understand and appreciate the complexity of the Andean in its current evolution, based on the challenges and opportunities that arise in the search for an interpretation.
Investigative competencies in medicine students: research skills in medical students, questioning abilities in medicine students
Authors: Rivera Torres Andrés Valentín
Published: December 2023

The development of competences in scientific and documentary research in the medical professional practice is of great importance since these will allow you to obtain the necessary data for the realization of consultations, as well as to check and / or develop new scientific theories, treatment of diseases, prevention satisfying the needs of society. A survey will be applied to 100 students of the Medicine career and interviews with 10 professors of the different levels in the Medicine Career (Basic, Intermediate and Advanced), where it is addressed from the perspectives of both on the current situation of scientific – documentary research in the students of the Medicine career of the Franz Tamayo Private University, of how is the evaluation to know the scope achieved in the research competences, if they have the necessary tools to develop scientific and documentary research following the APA (American Psychological Association) or Vancouver regulations, what they consider should be done to improve the situation in research during the teaching-learning process and if all teachers should use the same technological and motivational strategies.
The boundaries of the clinic in the practice of online psychoanalysis: beyond distances, the possible and the impossible?
Authors: Soto Daniel Castillo
Published: December 2023

The contemporary rhythms of life and constant interaction with technology had favored the emergence of new resources for psychoanalytic work at a distance. However, the COVID-19 pandemic forced the speed of some changes to accelerate: resources used for teaching or exceptional cases, suddenly become overcrowded in the face of restrictions on physical contact. This leads to think the clinic and its borders, starting from a different configuration of the analytical field, being conditioned the communications by ways that do not cover all forms of the face-to-face, having to consider new criteria and limitations for this modality of work, which could represent a different analytical situation, marked in many cases by the cross-cultural and the migrations of patients and analysts.
Innovative educational praxis with a focus on ethics and politics
Authors: Ayala Paula A Cervantes
Published: December 2023

The place of innovative praxis as a possibility for the realisation of the ethical and the political in an educational setting, within the framework of legal literacy and early citizenship is presented; to this end, the project is described as one of the techniques to address these processes, defining a specific didactic situation, which was applied to a community of students between twelve and fifteen years of age, for which the results are presented.
Synthesis of ZnO-TiO2 Nanoparticles by Sol-Gel Process and its Application for Solar Cell Semiconductor
Authors: Saridewi Nanda , Riyanti Aditya , Aziz Isalmi , Niski Kumila Biaunik , Lian Risa Adinda Ade
Published: December 2023

ZnO-TiO2 semiconductor can be used in Dye-Sensitized Solar Cell (DSSC) devices as an alternative to renewable energy. This semiconductor can be synthesized by sol-gel method. The objective of this study is synthesizing the TiO2-doped ZnO nanoparticle semiconductors for DSSC devices with mangosteen peel extract dye. Avocado seeds were extracted with water, as a capping agent in the synthesis of ZnO-TiO2 (TiO2 ratio of 0,3,5,7 and 10% to ZnO). XRD results show the success of ZnO-TiO2 doping, due to the 2θ shift and changes in the crystal lattice. The average crystal size obtained was 33.7972 nm. The SEM results showed that the particle size of ZnO ranged from 45-100 nm. The UV-Vis dye measurements of mangosteen peel extract showed an absorption peak at 296-483 nm wavelength, with a corresponding band gap energy value of 3.04 eV. The UV-Vis DRS ZnO-TiO2 measurements have an average band gap energy of 3.1425 eV and ZnOof 3.1915 eV. The highest DSSC efficiency value is 2.15 x 10-2% at 7% ZnO-TiO2 semiconductor.
Comparison of Maceration and Soxhletation Methods on the Antioxidant Activity of the Bouea macrophylla Griff Plant
Authors: Rudiana Tarso , Nurbayti Siti , Ashari Tiara Hadi , Zhorif Sherina Arestia , Suryani Nani
Published: December 2023

The impact of extraction methods on the potency of plant extracts is crucial. Bouea macrophylla Griff., a tropical fruit plant rich in phenolic and flavonoid compounds, exhibits strong antioxidant activity. This study aimed to evaluate the effect of maceration and soxhletation extraction techniques on B. macrophylla plants on antioxidant activity in vitro using the method of inhibiting DPPH radical compounds. Ethyl acetate and ethanol solvents were utilized to macerate and soxhlet all parts of the plant. Subsequently, each extract was subjected to quantitative analysis for antioxidant activity, total phenolic, and flavonoid content through UV-Vis spectrophotometry. Quantitative analysis revealed substantial antioxidant activity and notable levels of total phenolic and flavonoid content across all plant parts. The result indicated that although both maceration and soxhletation showed a significant impact on yield (p=0.009) and total flavonoids (p=0.038), significant differences in antioxidant activity (p=0.409) or total phenolics (p=0.874) within the plant extracts of B. macrophylla were not observed at a significance level of 5%.
Synthesis of Carboxylated Chitosan Amide Using Some Cyclic Anhydride and Their Activities as Antifungal
Authors: Ismiyarto Ismiyarto , Mumtazati Qonita , Pandelaki Elmi Christi Julia , Fachriyah Enny , Ngadiwiyana Ngadiwiyana , Sarjono Purbowatiningrum Ria , Prasetya Nor Basid Adiwibawa
Published: December 2023

Chitosan is a natural polymer that has antifungal activity. It is necessary to modify chitosan into its derivatives to increase its activity. One modification of chitosan that has the potential to be developed as an antifungal is carboxylated chitosan amide because this chitosan derivative contains a carboxylic group and is more hydrophilic. This research aims to synthesize chitosan amide carboxylate using several cyclic anhydride compounds and test its antifungal activity against Aspergillus flavus. The cyclic anhydrides used in this research are maleic anhydride and phthalic anhydride. In the initial stage of chitosan amide carboxylate synthesis, reaction optimization was carried out at varying temperatures of 25, 50, and 72oC for 7 hours. Compound characterization was carried out using FTIR and UV-Vis spectrophotometry. The disc diffusion method tested the chitosan amide carboxylate product for its antifungal activity against Aspergillus flavus. The optimal MCA (Maleoyl Chitosan Amide) product is (MCA_50), synthesized at a reaction temperature of 50oC. Under these optimal reaction conditions, PCA_50 (Pthaloyl Chitosan Amide) was successfully synthesized to produce a brownish-yellow solid with a yield of 46.1% (w/w) and a degree of substitution (DS) of 41.93%. The diameter of the inhibition zone against Aspergillus flavus for PCA_50 was 30 mm at the 12th hour of observation. The product (PCA_50) has better antifungal activity than chitosan and MCA_50.
Ensino e aprendizagem da tabela periódica
Authors: Krumreich Fernanda Doring , Zaicovski Cristiane Brauer
Published: December 2023

O presente estudo apresenta uma pesquisa-ação em relação ao ensino e aprendizagem do conteúdo da tabela periódica, aplicado a uma turma de terceiro ano do Curso Técnico em Agroecologia Integrado ao Ensino Médio da Escola Família Agrícola da Região Sul-EFASUL. Diante dos resultados obtidos, os educandos (as) consideraram a disciplina de Química importante, contudo, quando se tratava do conteúdo da tabela periódica, 42,8% alegaram que compreendem muito pouco ou quase nada a respeito deste conteúdo. A partir deste resultado, a elaboração de uma tabela periódica contendo os principais macronutrientes essenciais para as plantas tornou a aprendizagem mais atraente e contextualizada com a sua realidade, uma vez que dialoga diretamente com o dia a dia destes educandos (as), futuros Técnicos em Agroecologia. A estratégia da pesquisa-ação adotada neste estudo auxiliou no processo de ensino e aprendizagem de um conteúdo visto como de difícil compreensão, uma vez que possibilitou a aproximação da pesquisa aos reais problemas da sala de aula.
Results of Archaeometrical Studies on a Kontush Sash from Piaseczno (Pomorskie Province, Poland)
Authors: Miazga Beata , Grupa Dawid , Grupa Małgorzata
Published: December 2023

Archaeometric studies on silk thread wound around with metal strips are still rarely undertaken in Poland. Their popularization seems to be necessary, however, as there are many problems to solve. In the case of a kontush sash manufactured in Gdańsk as archaeological finds, the main question is whether they used metal strips prepared by local craftsmen, what raw material was employed, and what methods of gilding were implemented. Only future regular studies and analyses can answer these questions. The article presents the results of tests on metal strips wound around silk threads coming from a kontush sash manufactured by Besch, excavated in the crypt under the presbytery of the church of the Nativity of the Blessed Virgin Mary in Piaseczno (Pomorskie voivodeship, Poland).
Development of a simulation model of the activities of a transport and forwarding enterprise in the organization of international road cargo transportation
Authors: Lebid Ievgenii , Luzhanska Nataliia , Lebid Iryna , Mazurenko Alexander , Roi Maksym , Medvediev Ievgen , Sotnikova Tetiana , Hrevtsov Serhii
Published: December 2023

The object of this study is the process of planning the work of a transport and forwarding company when serving different categories of customers who need organizational support for the delivery of goods by road transport in international traffic.
The solved problem is due to the need to devise recommendations for organizing the work of forwarders when interacting with customers of transport and forwarding services that export or import different categories of cargo.
A simulation model of the transport and forwarding company’s work in customer service was developed and implemented in the GPSS World simulation automation package.
The model provides for the optimization of organizational and management processes in cooperation with customers of transport and forwarding services.
When developing the model, the duration of the types of work in which freight forwarders are involved in the export and import of goods by road transport was taken into account. The model also predicts the probability of errors in the forwarder’s work and the duration of their elimination. The application of the developed model in practice will enable the owners of transport and forwarding companies to plan the full-time number of forwarders and the duration of service provision under different conditions of interaction with customers. The simulation results reflect the performance indicators of the enterprise in serving different categories of customers. This will make it possible to optimize the work of the enterprise by planning personnel support. At the same time, the duration of transport and forwarding services will be reduced by 10–15 %, the capacity of the enterprise will increase by 6–11 %, and the reliability of service provision will increase by 8–14 %
Detecting the effect of an intermediate adapter on the load of the bearing structure of an open wagon
Authors: Lovska Alyona , Dižo Ján , Prokopovych Ihor , Zharovа Oksana , Voronenko Serhii
Published: December 2023

The object of the research is the processes of occurrence, perception, and redistribution of loads in the load-bearing structure of an open wagon body, taking into account the use of an intermediate adapter.
To reduce the vertical dynamic loads acting on the supporting structure of the railroad car, it is suggested to use an intermediate adapter between the frame and the load. The dynamic load of the supporting structure of the open wagon was modeled, taking into account the use of an intermediate adapter. The research was carried out in the vertical plane during the oscillations of the bouncing of the car. The results of the calculations showed that the acceleration acting in the center of mass of the supporting structure of the open wagon is 4.2 % lower than that acting on the supporting structure of the open wagon without using an adapter. The obtained acceleration results are taken into account when determining the strength of the supporting structure of the open wagon. It was established that the use of an intermediate adapter contributes to the reduction of stresses in the supporting structure of the open wagon by 6 % compared to the typical scheme of cargo transportation.
A feature of the results is that the proposed solution to reduce the dynamic load of the supporting structure of the car can be implemented without improving its design.
The field of practical use of the results is the engineering industry, in particular, railroad transport. The conditions for the practical use of the research results are the placement of the adapter over the entire floor area of the car body.
The research will contribute to devising recommendations on reducing the load on the load-bearing structures of cars, the costs of their unplanned repairs, and to increasing the efficiency of railroad transport operation
Designing tools for assessing the reliability of electric motor torque measurements by using identifiers of anomalous deviations in a noisy signal system
Authors: Kvasnikov Volodymyr , Kvashuk Dmytro , Prygara Mykhailo , Legeta Jaroslav
Published: December 2023

The problem of the reliability of measurements of rotational parameters of electric motors was solved, which was focused on the development of an algorithm for evaluating measurements under conditions of additional noise. An analysis of methodological approaches and mathematical tools used to process and interpret the uncertainty of measurement results was carried out. Cases where they may not be effective due to high noise levels were considered. To detect anomalies in the signal, an algorithm for assessing the reliability of measurements using fuzzy logic was proposed. A structural diagram of the model for measuring the torque of an electric motor under the conditions of a noisy signal was developed, where transfer functions were used to model the angular velocity and torque parameters. A method for detecting anomalies in noisy signals is presented, which identifies the amplitude and time characteristics of spiking pulses. The method includes the application of a wide range of analytical tools for deep analysis of signals and is particularly effective for detecting anomalies that may be hidden in background noise. A prototype of a measuring bench was developed, which uses neural networks to detect anomalies when measuring the rotational parameters of electric motors, which made it possible to obtain a training sample using a sample electric motor and apply it to evaluate the parameters of another electric motor. In a practical aspect, the developed methods and technological solutions for improving the reliability of measurements of rotational parameters of electric motors could be used to make corrections in existing systems. In particular, they could be used in industry, electric transport, as well as in the aerospace and military sectors where the reliability of measuring systems is important
Design and research of the ground robotic system structure for weapons remote control
Authors: Dehtiarov Ivan , Leontiev Petro , Miroshnychenko Dmytro , Lanchynskyi Vadym , Buhaiets Pavlo
Published: December 2023

During hostilities, ground robotic systems play an important role in minimizing losses of servicemen and suspending the combat capabilities of troops. For firing, robotic complexes are equipped with gun turrets. Researchers are conducting research to improve the performance, reliability and firing accuracy of such turrets. This work describes the design and research of an experimental sample of a ground robotic system, which is equipped with a turret for controlling the position of a machine gun. The description and results of experimental studies of dynamic loads during robot movement at different speeds and road conditions are presented. It was established that the values of the maximum accelerations that must be worked out by the stabilization system during operation for the experimental design of the robot do not exceed 20 rad/s2. The possibility of using counterweights was considered to reduce the torque of the turret guidance drive while reducing the dimensions of the robotic system structure. The description of the experimental module equipped with a control and measurement system and the results of experimental studies on determining the power of the turret drives during the manipulation of the structure are presented. A procedure of dynamic analysis and the results of modeling the movement of the gun turret in the ANSYS software package are presented. The proposed method for designing the structure ensures the determination of the impact on the structure of the complex shape of loads caused by its manipulation, to compensate for the exciting loads when the robotic system is moved over the terrain. With the help of this method, it is possible to determine and minimize the power, and therefore the energy consumption, of azimuth and lifting electric drives at the design stage
Synthesis of nanocarbon by high-voltage breakdown of hydrocarbons
Authors: Kuskova Nataliya , Malyushevskaya Antonina , Prystash Mykola , Prystash Svitlana , Adamchuk Yury
Published: December 2023

The object of research is the mechanisms of synthesis of nanocarbon structures in the process of electric high-voltage breakdown of hydrocarbons.
The problem to be solved is the purposeful synthesis of various types of nanocarbon with small losses of raw materials.
Mechanisms of nanocarbon formation in the process of high-voltage electric breakdown of hydrocarbons have been established. It is shown that a high-voltage breakdown leads to a cascade of chemical transformations. As a result of transformations, lower gaseous hydrocarbons are formed due to the destruction of molecules and higher ones – as a result of polymerization, and as a result of dehydrocyclization and polymerization with the participation of metal catalysts – various carbon nanostructures. The possibility of targeted synthesis of fullerene-like structures, nanotubes with diameters from 10 to 50 nm, nanofibers, and films is demonstrated. Experimental studies have confirmed that the qualitative and quantitative composition of nanocarbon can be varied in a wide range. With an increase in the number of carbon atoms or the number of C–C bonds in the raw material molecules, other things being equal, the practical yield of solid nanocarbon increases. It was determined that the synthesis of structured nanocarbon from a mixture of hydrocarbon gases, formed as a result of high-voltage breakdown of liquid hydrocarbons, actively occurs on the nickel-chromium catalytic surface. An increase in the area of the catalytic deposition surface leads to an increase in the yield of nanocarbon. The study of the ability of the obtained nanocarbon samples to absorb electromagnetic radiation confirmed the potential of the method of high-voltage breakdown of hydrocarbons for the synthesis of materials that weaken electromagnetic radiation at a frequency of 25 to 38 GHz. The greatest weakening is observed for samples consisting mainly of carbon nanotubes and nickel nanoparticles
Synthesis of two-mass electromechanical systems with cascade connection of fractional-order controllers
Authors: Kopchak Bohdan , Kushnir Andrii , Onoshko Inna , Vovk Sergiy
Published: December 2023

The research focused on two-mass electromechanical systems widely utilized in industry. The challenge addressed in this work was to improve the synthesis of controllers for such systems to simplify it and enhance the quality of transition processes. Traditionally, the synthesis of control system loops for these systems was carried out using integer controllers and standard forms. However, this approach led to the synthesis of complex integer controllers that are difficult to implement. To overcome this issue, an original approach to the synthesis of control system loops based on the fractional characteristic polynomial is proposed. The fractional characteristic polynomial ensures the desired quality of the transition process given the implementation of a specified structure of the fractional controller. A new method of structural-parametric synthesis of fractional-order controllers is developed for the case of their cascade connection in multi-loop two-mass electromechanical systems. Additionally, an algorithm for synthesizing fractional-order controllers for the corresponding control loops is presented. This enabled the structural-parametric synthesis of fractional-order controllers for a two-mass electromechanical system with the cascade connection of controllers. Such an approach provides better quality of transition processes compared to classical integer controllers, simplifies the synthesis, and thereby enhances the quality of the synthesized systems. The impact of the synthesized fractional-order controllers using the proposed approach on the dynamic properties of the two-mass «thyristor converter – motor» system was investigated. The research results demonstrated the practical applicability of fractional controllers designed using the proposed method for the synthesis of automatic control systems of two-mass electromechanical systems in the industry.
Features of the coefficient of variation of parameters of the gas environment in fire in the premises
Authors: Pospelov Boris , Bezuhla Yuliia , Kozar Yurii , Krainiukov Olekcii , Chubko Larysa , Yashchenko Oleksandr , Liashevska Olena , Shcherbak Sergey , Cherevko Pavlo , Kurepin Viacheslav
Published: December 2023

The object of the study is the selective coefficient of variation of dangerous parameters of the gas environment during the ignition of materials. The measure of the sample coefficient of variation of an arbitrary hazardous parameter of the gas environment observed at an arbitrary time interval is substantiated. The representativeness error of the measure of the sampling coefficient of variation, which depends on the value of the measure and the sample size, was determined. The measure allows you to numerically determine its value for an arbitrary observation interval. The difference in the measure at the intervals corresponding to the reliable absence and occurrence of ignition allows to detect the occurrence of ignition of the material. According to the results of laboratory studies, the measures of the sample coefficient of variation for carbon monoxide concentration, smoke density, and temperature of the gas medium in the laboratory chamber at intervals of absence and appearance of ignition of alcohol, paper, wood, and textiles were determined. It was established that the dangerous parameters of the gas environment at the intervals of absence and presence of ignition are characterized by different values of the increase in the measure of the sample coefficient of variation. For example, it is determined that the ignition of alcohol causes the maximum increase in the measure for carbon monoxide concentration from 0.135 to 0.441, for smoke density from 0.629 to 0.805, and for temperature from 0.001 to 0.115. When paper catches fire, the measure for carbon monoxide concentration and temperature increases from 0.0026 to 0.140 and from 0.0019 to 0.05, respectively. When burning wood, the measure for carbon monoxide concentration and temperature increases from 0.0072 to 0.177 and from 0.0067 to 0.016, respectively. The obtained results, provided that the hazardous parameters of the gas environment in the premises are measured and the sample coefficient of variation is calculated in practice, make it possible to use them in the creation of early fire detection systems
Designing and testing a prototype of optical-electronic station for detecting and tracking moving objects in the air
Authors: Shostko Ihor , Tevyashev Andriy , Zemlyaniy Oleg , Tsibulnikov Dmytro
Published: December 2023

The object of this study is the process of detection and tracking of air targets.
The task being solved is to choose priorities between hardware and software solutions to eliminate structural contradictions in the design of a supporting and rotating device, which at the same time should ensure high speed and accuracy of tracking aerial objects for the optical-electronic station.
A prototype of an optical-electronic station was designed and built. The study of the effect of eliminating structural contradictions by hardware and software methods on the accuracy characteristics of the supporting and rotating device was carried out. We have developed original specialized software for testing the accuracy of command execution. A procedure for testing the optical-electronic station has been devised. All conducted tests were performed in compliance with accepted norms and standards.
The mechanism of influence of the method of controlling the servo drives of the supporting and rotating device on the characteristics of the optical-electronic station has been established. In this case, the program method has priority. In contrast to existing solutions, the developed software method of controlling the support-turning device makes it possible to exclude stops at the limits of the servo control period and to realize a smooth transition to a new value of the tracking speed. Owing to the improvement of forecasting and synchronization of servo parameters with the period of its control, it was possible to solve the investigated problem by the software method.
The mechanism of influence of the inertia of the supporting and rotating device on the characteristics of the optical-electronic station has been established. In this case, the hardware method has priority.
The results could be used to improve the characteristics of optical-electronic stations in the detection and high-precision tracking of moving objects in the air environment
Analysing the implications of cybersecurity breaches on firm leadership
Authors: Oluka Alexander
Published: December 2023

The object of this research is the implications of cybersecurity breaches on the leaders of accounting firms in KwaZulu-Natal, South Africa. The research employed a qualitative approach with interviews as the primary data collection technique. The researcher adopted a rigorous analytical framework, utilising different scholarly sources to analyse and explain the intricate experiences of firm leaders. The study revealed that leaders of accounting firms experience psychological, financial, and social consequences due to cybersecurity breaches. It highlights the emotional impact, including anxiety and increased stress. The fear of potential job losses was found to be one issue leaders were worried about after the data breach. The stress from dealing with the aftermath of data breaches affected their family relationships. In addition, leaders experienced low productivity and increased pressure dealing with the media and organization stakeholders and the stigma associated with data breaches. Given the critical role that accounting firms play in the financial ecosystem and the sensitive nature of the data they handle, it is imperative that cybersecurity is prioritised. However, studies have focused on the financial implications of cybersecurity breaches on businesses, but less attention has been paid to the psychological, social, and financial implications of breaches on firm leaders. The findings are significant for academic discourse but also provide leaders with strategies to mitigate the adverse effects of breaches, while also offering a framework for other researchers and practitioners in different regions and sectors to understand and study the phenomenon further.
The development of the method of evaluation of complex hierarchical systems based on improved alforitm of particle swarm
Authors: Shyshatskyi Andrii , Pluhina Tetiana , Plekhova Ganna , Binkovska Anzhela , Pronin Sergii , Stasiuk Tetiana , Nalapko Oleksii , Protas Nadiia , Pliushch Tetiana , Burlak Dmytro
Published: December 2023

The scientific task, which is solved in the research, is to increase the efficiency of the evaluation of complex hierarchical real-time systems. Finding solutions to nonlinear optimization problems and especially global optimization problems is one of the most popular problems in computational mathematics. In applied problems, the objective function, as a rule, has a large number of variables, is not given in an analytical form and is calculated as some integral characteristic of a complex dynamic process. The development of effective methods, to a certain extent adaptive to the variability of the objective function, is especially relevant in connection with the development of computer technology and the possibility of using parallel computing systems. The conducted research was aimed at developing a method of evaluating complex hierarchical systems based on an improved particle swarm. At the same time, the object of research was complex hierarchical real-time systems. The subject of research is the functioning of real-time hierarchical systems.
The novelties of the proposed method consist in:
‒ creating a multi-level and interconnected description of complex systems of hierarchical real-time systems;
‒ increasing the efficiency of decision making while evaluating complex systems of hierarchical real-time systems;
‒ solving the problem of falling into global and local extremes while assessing the state of complex systems of hierarchical real-time systems;
‒ the possibilities of directed search by several individuals of the particles swarm in a given direction, taking into account the degree of uncertainty;
‒ the possibilities of re-analysis of the state of complex systems of hierarchical real-time systems;
‒ avoiding the problem of loops while visualizing the state of the national security system in real time.
It is advisable to implement the specified method in specialized software, which is used to analyze the state of complex systems of hierarchical real-time systems and make management decisions.
Laboratory studies of induction of flow using vibratory wave draining in carbonate low-permeability reservoirs
Authors: Rubel Victoriia , Rubel Vyacheslav
Published: December 2023

The object of the study is a laboratory unit for inducing flow to the well using vibration wave draining in carbonate low-permeability reservoirs. Vibratory wave draining is a method used to stimulate flow draining to the well. The method is based on the fact that mechanical waves generated in the soil can cause the opening of microcracks and pores, which leads to an increase in the fluid flow. Vibratory wave scouring can be effectively used to increase fluid flow in low-permeability carbonate reservoirs. Carbonate reservoirs are a common type of reservoir in the oil and gas industry. They often have low permeability, which makes it difficult to extract fluid.
With the help of the plunger device developed in the work, a fluid disturbance was created, thereby creating elastic waves in the conventional well (plastic pipe), which were measured using a manual contact vibrometer. This demonstrated the effectiveness of the vibratory method to increase the well productivity and helped to improve the permeability of the rocks, providing better access to challenge the influx of hydrocarbon products.
It is shown that with a significant decrease in the permeability of the formation well zone (FWZ), the flow induction should be started only after the restoration works. Otherwise, the well will be significantly hydrodynamically imperfect due to the quality of the reservoir opening, and the flow of production into the well will occur only through a few separate areas of the reservoir with relatively high permeability, which will lead to uneven production of the reservoir and low return of hydrocarbons. Therefore, it is advisable to use the developed method of influencing the productive layer in low-permeability rocks, such as carbonates with layers of clay, siltstones, argillites, and others, with low formation pressures.
The obtained results are based on the generation of vibrations that are transmitted to the wellbore. These vibrations can help break up contaminants and fines in carbonate rocks, facilitating the release of hydrocarbon products and improving permeability.