bluuebunny/crossref_metadata_2025 huggingface dataset:
Pregnancy in the COVID-19 pandemic, prenatal care, and digital technologies: women’s experiences
Authors: Silva Carla Marins , Bezerril Amanda Vieira , Martins Elaine Lutz , Mouta Ricardo José Oliveira , Zveiter Marcele
Published: July 2023

Objective: to know the experience of being pregnant and using technologies for gestational care during the COVID-19 pandemic. Methods: qualitative study, conducted in a virtual environment. A total of 20 women who used digital technologies in pregnancy care during the pandemic were interviewed by videoconference. The data were submitted to content analysis supported by the Atlas.ti9 program. Results: two categories emerged: "Women's feelings on being pregnant during the pandemic of COVID-19", encompassing feelings, expressed by fear, insecurity, and loneliness, related to facing a new disease and social isolation; "Women's experiences with the use of digital technologies in pregnancy care", showing autonomy in the search for online information about pregnancy and groups of pregnant women, in applications or social networks. Furthermore, they remotely experienced bonding and maintenance of prenatal care by health professionals. Conclusion: the use of digital technologies in the pandemic was an imposed reality that positively contributed to clarifying doubts, care, and emotional support during pregnancy. Contributions to practice: the use of digital technologies showed benefits in the pandemic and can be extended to the daily routine of prenatal care, especially in situations that make it difficult for pregnant women to access services.
Parameters Of Vascular Tone Regulation And Gene Polymorphism Associated With Cardiovascular Risk In Young Subjects
Authors: Akimova Natalya S. , Elkina Anastasiya Yu. , Dzhioeva Olga N. , Sokolov Ivan M. , Kiselev Anton R. , Drapkina Oxana M. , Shvarts Yury G.
Published: July 2023

Introduction — The identification of preclinical stages of vascular pathology is the most promising for prevention of hypertension (HTN). It is important to investigate the polymorphism of genes which end products are involved in the regulation of blood pressure (BP) and predispose to vascular tone (VT) dysregulation. Objective — To investigate the clinical and prognostic significance of the AGT and AGTR1 polymorphic variants associated with increased cardiovascular risk in young subjects and patients with HTN. Methods — The study involved 2 independent groups: young healthy volunteers and hypertensive patients. The VT regulation was assessed by the active standing test. The polymorphism was identified using DNA pyrosequencing. Results — The C allele of the AGTR1 A1666C A>C variant was associated with lower HR in supine in both groups. The risk allele C of the M268T T>C polymorphism was associated with lower systolic BP and diastolic BP during the 1st minute of upright posture. The C allele of the AGTR1 A1666C A>C variant was associated with earlier onset of HTN. Conclusion — The identification of the AGTR1 A1666C A>C and AGT M268T T>C variants can be informative for clarifying the risk of HTN when the young subjects are examined, as well as the probability of early onset of HTN.
[es] LA VARIEDAD DEL PARADIGMA CORTESANO EN EL DIÁLOGO RENACENTISTA
Authors: Gómez J.
Published: July 2023

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[es] "YA NO HAY REY SIN PRIVADO": CRISTÓBAL DE MOURA, UN MODELO DE PRIVANZA EN EL SIGLO DE LOS VALIDOS
Authors: Martínez Hernández S.
Published: July 2023

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[es] LA CAPILLA REAL: LA PRESENCIA DEL CAPELLÁN REAL EN LA ÉLITE DEL PODER POLÍTICO
Authors: Granda S.
Published: July 2023

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[es] JORNADAS REALES, RED VIARIA Y ESPACIO CORTESANO EN TIEMPO DE FELIPE IV: LAS PREVENCIONES CAMINERAS DEL DOCTOR JUAN DE QUIÑONES, ALCALDE DE CASA Y CORTE
Authors: Ezquerra Revilla I.
Published: July 2023

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De Hojas de hierba al Martín Fierro: construcción de la identidad cultural del norte y sur americano
Authors: Pérez Santos Judit
Published: July 2023

Las similitudes contextuales de las obras Hojas de hierba y Martín Fierro apuntan a una tendencia similar en lo que a la construcción de la identidad del continente americano se refiere. La independencia política y económica respondía a conflictos sociales insertos en los sistemas de estas naciones pero que no concluyeron con el logro de la emancipación. Los referentes culturales de las metrópolis seguían vigentes décadas después de la independencia y los artistas de estas naciones comenzaron a desarrollar objetos artísticos con referencias autóctonas que completaran y así construyeran la nueva patria anhelada.Palabras clave: Hojas de Hierba, Martín Fierro, identidad cultural.
Dos poetas para un infierno: el imaginario del abismo de Baudelaire en Gil de Biedma
Authors: Santiago Romero Sergio
Published: July 2023

En la obra de Jaime Gil de Biedma (poesía, prosa crítica y epistolario) se exhibe un extraordinario interés por Charles Baudelaire, considerado padre de la modernidad poética. El presente artículo analiza la apropiación que el poeta realizó del imaginario infiernal moderno descrito por el vate francés (es decir, el sub-mundo urbano y el infierno interior del hombre, consignado en el erotismo). Con ello se pretende demostrar que el fenómeno intertextual que apreciamos en la obra biedmaniana con respecto a Baudelaire no es un mero juego literario, sino un vector semántico clave para interpretar la poesía del autor español.Palabras clave: Jaime Gil de Biedma, Charles Baudelaire, intertextualidad, infierno moderno.
Tres modelos para la reconstrucción posmoderna del héroe medieval: la figura de Rodrigo Díaz de Vivar en tres novelas históricas españolas del siglo XXI
Authors: Crespo-Vila Raquel
Published: July 2023

Dado el apogeo de la ficción histórica y la evidente inclinación de los autores españoles hacia el periodo medieval, este trabajo analiza tres novelas españolas que, publicadas a comienzos del siglo xxi, recurren a la figura de Rodrigo Díaz de Vivar como motivo argumental. El objetivo es, por tanto, examinar las diferentes estrategias narrativas utilizadas en cada una de ellas para reconstruir la figura de este personaje histórico, poniéndolas en relación con los patrones discursivos más característicos de la novela histórica posmoderna.Palabras clave: Rodrigo Díaz de Vivar, José Luis Corral Lafuente, Magdalena Lasala, José Luis Olaizola, novela histórica posmoderna.
Tradición clásica y culturalismo en los poetas españoles de la generación de los cincuenta: la poesía de Francisco Brines
Authors: Álvarez Ramos Eva
Published: July 2023

La presencia de la tradición clásica en la poesía española de la generación del cincuenta es un elemento a tener en cuenta. Los personajes y los motivos clásicos, que configuran el imaginario poético de esta generación, pueden verse representados en la obra de Francisco Brines y sirven, asimismo, como muestra ejemplar de la presencia de recursos culturalistas en las letras españolas de los cincuenta. Estos usos contribuyen a demostrar la falsa ruptura poética adscrita a los poetas de los setenta, pues ponen de manifiesto cómo los hombres de los cincuenta están ya escribiendo en clave culturalista.Palabras clave: culturalismo, tradición clásica, generación del 50, BrinesClassical Tradition and Culturalism in the Spanish Poets of the Generation of ’50: the Poetry of Francisco BrinesAbstract: The presence of classical tradition in the mid-twentieth century Spanish poetry, is a very important element. The characters and classical motifs that configure the poetic imaginary of this Generation can be seen represented in the poetry of Francisco Brines and can be used also as an exemplary sample of the presence of culturalist resources in the Spanish lyric of the Generation of ’50. These uses help to prove the false poetic break ascribed to the poets of the seventies, as they show how the men of the fifties are already writing on culturalist key.Key words: Culturalism, Classical Tradition, Generation of ’50, Brines.
«La vida se adivina»: el poso de la experiencia vital en la poesía de Claudio Rodríguez
Authors: García García Sergio
Published: July 2023

El siguiente estudio tiene como objetivo principal afianzar la relación «poesía y vida» en la obra literaria de Claudio Rodríguez, a partir de un recorrido por algunos de los temas más destacados de su escritura (la familia, la infancia, la ciudad de Zamora, el campo castellano, el mar y el amor, entre otros) en relación con determinados periodos y momentos puntuales de su biografía. Para dicha investigación se ha revisado aquella bibliografía vinculada con la vida del autor. En ningún momento se ha llevado a cabo ningún tipo de entrevista directa a familiares o amigos; los testimonios directos sobre la biografía de Rodríguez han sido extraídos de la bibliografía anteriormente mencionada.Palabras clave: Claudio Rodríguez, biografía, familia, infancia, Zamora.«La vida se adivina»: The sediments of life experience in the poetry of Claudio RodríguezAbstract: The main goal of the following study is to strengthen the connection «poetry and life» in the literary work of Claudio Rodríguez. This will be done through an overview to some of the most highlighted themes appearing in his writing (such as family, childhood, the city of Zamora, the Castillian country, the sea and love, amongst others) in relation with specific periods and moments of his biography. For such investigation, it has been reviewed the biography connected to the author’s life. It has not been carried out any interview to his relatives or friends at any point. The direct testimonies about Rodríguez’s biography have been taken out from the previously mentioned biography.Key words: Claudio Rodríguez, biography, family, childhood, Zamora.
Las cartas de Juan Chabás a Josefina de la Torre: la dicotomía de escritor y amante
Authors: Hatry Laura
Published: July 2023

Este artículo se ocupa de las cartas de amor inéditas que envió Juan Chabás a Josefina de la Torre en el intervalo de tiempo comprendido entre los años 1925 y 1931; la correspondencia pasa por las fases de una relación cordial de amigos, de amor y la ruptura final que conlleva la desazón del escritor por perder a su amada. Estas cartas sirven como punto de partida para enfocar la prosa poética y la faceta periodística de Juan Chabás, así como la vida de la época y la dificultad de separar el oficio de escritor de la vida personal. Para ilustrar estos aspectos se reproducen fragmentos y algún poema que aparecen en las cartas.Palabras clave: Juan Chabás, Josefina de la Torre, cartas, correspondencia.Juan Chabás’s letters to Josefina de la Torre: the dichotomy of writer and loverAbstract: This article examines the unpublished love letters that Juan Chabás sent to Josefina de la Torre in the time period of 1925 to 1931; the correspondence includes the initial phase of friendship, their romantic relationship and the final breakup that led the writer to desperation upon losing his lover. The letters are used as a framework to focus on Juan Chabás’s poetic prose and his journalist facet, as well as the cultural life of the time and the difficulty to separate the profession of a writer from his personal life. Some fragments and poems that can be found in the letters are also reproduced in order to illustrate these aspects.Key words: Juan Chabás, Josefina de la Torre, letters, correspondence
¿Una ‘nueva narrativa’? Tres representaciones contemporáneas de la literatura latinoamericana: Jorge Volpi, Martín Rejtman y Rodrigo Fresán
Authors: Fernández Polo Sara , Mateo Jiménez Martina , Sánchez Martínez Francisca
Published: July 2023

A partir de las propuestas de Jorge Volpi, Martín Rejtman y Rodrigo Fresán, autores latinoamericanos nacidos en la década de los sesenta, intentaremos dar cuenta de cómo esta narrativa enfrenta un cambio de paradigma resultado de los procesos contemporáneos marcados por la globalización. Ello se traduce en la exploración de una identidad desprendida ahora de lo local y en la configuración de unos personajes determinados por la inercia. En definitiva, estéticas que confluyen en la búsqueda de nuevas perspectivas con que enfrentar lo latinoamericano.Palabras clave: narrativa latinoamericana, globalización, Jorge Volpi, Martín Rejtman, Rodrigo Fresán.A new narrative? Three exponents of contemporary Latin American literature: Jorge Volpi, Martin Rejtman and Rodrigo FresánAbstract: In this article we analyze the fiction of Jorge Volpi, Martín Rejtman and Rodrigo Fresán, Hispano-American writers born in the sixties. We focus on how this narrative undergoes a change of paradigm as a result of contemporary dynamics affected by Globalization. This literature explores an identity emerging from the loss of the «local» concerns (contradictory to «global»), as well as develops characters determined by inertia. In short, the aesthetics converge in search of new perspectives to confront Latin American issues.Key words: Latin American narrative, globalization, Jorge Volpi, Martín Rejtman, Rodrigo Fresán.
2020 Parliamentary Elections in Online News Dailies: Do the Media Tend to Criticize the Ruling Party More
Authors: Danieliūtė Iveta
Published: July 2023

Voters tend to criticise and punish the ruling party for mistakes made during the term of office and therefore never vote for the same party twice in a row. However, there are no studies on whether the ruling party receives more criticism in the media during election periods.

The article focuses on the portrayal of the opposing political parties – the Lithuanian Peasant and Green Union and the Homeland Union – Lithuanian Christian Democrats – in online news dailies during the 2020 parliamentary elections.

The study shows that the media publishes more negative news about the ruling party, but that the communication strategy chosen by the politicians themselves also contributes to this. A link can also be found between the presentation of parties in the media and the final results of the parliamentary elections.
Anxiety (DASS21) and the Quality of Life (FertiQol) of Infertile Women Underwent In Vitro Fertilization
Authors: Tjahyadi Dian , Irsyad Bayu Indrayana , Pramatirta Ahmad Yogi , Andayani Santi
Published: July 2023

Infertility affects physical and mental health and has various consequences. In vitro fertilization (IVF) is one of the Assisted Reproductive Technology (ART) programs that include several phases, requiring longer time, more patience, and is expensive. This may make women who undergo the ART program to have higher stress level, especially anxiety. This study aimed to determine the relationship between anxiety and quality of life in infertile patients undergoing assisted reproductive technology programs. This was a cross-sectional observational analytic study performed at Aster Fertility Clinic, Dr. Hasan Sadikin General Hospital and Bandung Fertility Center, Limijati Hospital Bandung, Indonesia, from February until April 2020. The analysis was performed using the DASS21 scale and FertiQol count on 27 subjects undergoing the IVF program and 30 control subjects who were pregnant without IVF program. The statistical analyses used to determine the condition of anxiety and the condition of quality of life were the Chi-square and the Mann-Whitney tests, while the relationship between anxiety and quality of life as the main subject was measured using the Spearman correlation test. The anxiety level as measured with the DASS21 instrument in the subject and control groups was 6.2 vs 0.7 with p<0.001. From the analysis of the FertiQol instrument in the subject and control groups, the scores were 79.6 vs. 98.9 for the mind-body domain (p<0.001); 68.8 vs 98.5 for the emotional domain (p < 0.001); 83.2 vs 95.7 for the relational domain (p<0.001); and 77.6 vs 97.6 for the social domain (p<0.001). For the overall FertiQol core domains, the score was 77.3 vs 97.7 (p<0.001). The correlation between anxiety and the FertiQol total core domains were evident from the results of the Spearman correlation test, with an r-value of -0.479 (p<0.001). Therefore, there is a significant negative correlation between anxiety and quality of life.
Drug Interactions in Diabetic Ulcer Patients in an Indonesian Private Hospital
Authors: Roosyidah Finny Alifiyatur , Yulia Rika , Herawati Fauna , Wijono Heru
Published: July 2023

Diabetic ulcers can progress into tissue death, or gangrene, which create a risk for amputation. Measures for preventing other complications and accelerating wound healing in diabetic ulcers include blood sugar level control, diet adjustment, wound care, antidiabetic drug administration, and comorbid therapy. This leads to the use of various drugs that can potentially trigger drug interactions. This study aimed to identify possible drug interactions in the therapeutic management of diabetic ulcer patients treated in Husada Utama Hospital Surabaya, Indonesia, from January 2020–June 2022. This was a descriptive observational study using retrospective data from medical records. Results showed that 103 types of drugs were administered to 48 research samples with 41 of them experienced drug interactions (n=263 cases). Based on the severity of drug interactions, 31 cases were categorized as major cases (11.79%), with drug-class antibiotic-antiemetic interactions as the most frequent interactions. This study proves that it is essential for doctors and pharmacists.
Powwow Regalia in Identity Performance and Authentication
Authors: Cselényi Zsuzsanna
Published: July 2023

Through personal narratives of powwow involvement and motivation for dancing, this essay examines the ways in which regional and personal identities are being formed, adjusted, negotiated, and expressed through dance regalia at powwows in the Midwestern United States. Dancers use clothes as an explicit marker of their Native identity and powwows as a justifying context for their ideologies of authenticity. Powwow involvement is also used to consolidate, reclaim, craft, revive, and create an identity that authenticates one's place in the powwow community in which internal and external roles and rules reinforce each other. Giving voice to different constituents at Midwestern powwows, from Natives to non-Native enthusiasts, the study explores the factors that influence the bases and strategies of such authentication, as well as the rhetoric by which these ideologies are expressed.
“The Sisters of the Redeemer in the Trauma of Dispersion”. •
Authors: Paréj-Farkas Katalin
Published: July 2023

While researching the history of the Sisters of the Divine Redeemer, also referred to as the Sisters of the Redeemer, it became clear that the ordeals of the Second World War and the Communist dictatorship had a profound impact on the congregation, which was engaged in nursing and teaching. The sources allow us to reconstruct the horrors of the advancing battlefront and the sisters' flight, along with their determination to provide social assistance and their role in saving Jews. The Communist regime that emerged after the war forced the congregation into an increasingly impossible situation, depriving them of their teaching positions and nursing vocation. Their internment in 1950 and the revocation of the congregation's operating license seemed to have eliminated the community entirely. However, recollections of the events of the 1950s and 1960s, together with state security reports, attest that the congregation survived in the form of a “subterranean stream,” and that tiny communities of sisters continued to pursue their monastic vocation, often in a single apartment that functioned as a mini convent. The traumas they had experienced rarely crushed the sisters' inner sense of peace, and they strove to cope with the harassments inflicted by the party-state by adapting to the new situation.
Implementation of clustering technique for analyzing consumer buying behavior during the COVID-19 pandemic: a case in the beauty industry
Authors: Achsan Beny Maulana , Hidayanto Achmad Nizar
Published: July 2023

The global demand for beauty products continues to grow due to raised public awareness of applying cosmetics, with a 1.45 % to 3.34 % growth annually. Unfortunately, the COVID-19 outbreak broke out globally in December 2019, affecting face-to-face businesses such as the beauty industry falling until –7.11 % in 2020. This study aims to analyze the impact of the COVID-19 outbreak on Indonesia’s beauty industry and the shift in the beauty consumer segment during the pandemic.
This study adopts the react-cope-adapt (RCA) framework to construct the COVID-19 pandemic periodization in Indonesia. The correlation analysis was used to investigate the impact of the COVID-19 pandemic on the beauty industry. In addition, clustering techniques were employed to identify hidden consumer segments and product preferences throughout the COVID-19 outbreak.
The study shows that COVID-19 cases positively impact beauty company’s sales during the reacting phase. A strong negative relationship between COVID-19 and company revenue was observed in the coping phase. In the adapt phase, the negative impact of COVID-19 on the company’s sales has decreased. Our finding also confirms the shift in consumer buying behavior during the pandemic. Consumers prefer to buy cosmetics products online than offline during the reaction phase. In the coping phase, consumers slowly begin to purchase in-store. Finally, consumers return to buying cosmetics offline in the adapting phase, similar to before the pandemic. The clustering results showed three hidden consumer segments: the loyal consumer segment, the impulsive consumer segment, and the compulsive consumer segment. In addition, during the pandemic, consumers prefer to buy skincare products over make-up products since government policies forced people to stay, work, and study at home.
Our study has theoretical and practical implications. Theoretically, our results support the usefulness of the RCA model and clustering techniques in analyzing the change in consumer buying behavior during a time of crisis, such COVID-19 pandemic. Practically, beauty industries can anticipate this shift by accelerating the digital business transformation and focusing on the most preferred product to sustain their business
Identifiying the PID-N method performance for speed control of BLDC motor propeller on catamaran ships model
Authors: Setiawan Budhy , Firdaus Mohammad Kamil , Wibowo Sapto , Agafta Ian , Zain Fikri
Published: July 2023

Some archipelagic countries must have wide sea. This condition means that there is transportation of goods and people problem. Therefore, an effort has been made to explore renewable energy especially solar energy. In this research, a BLDC (Brush Less Direct Current) motor propeller is applied, and PID-N (Proportional, Integral, and Derivative – Filter Coefficient) method for Catamaran ship speed control. Where PID-N has additional filters such as P, I, and D; however, the advanced performance of this control uses RLS (Recursive Least Square) actuator modeling is the most systematical and flexible design. The experiment includes the speed response of ships with payload and without payload, as well as changes in speed settings. The results show that the ship's speed control using the PID-N has smooth and definite speed control. The PID-N design is systematical, easy and quick for the control designer to change the actuator or sensor performance, if there will be any actuator or sensor replacement with different specifications, which is required in commercial. As it is known, in commercial design, time and method are crucial and has to be effective. The PID-N control method shows its superiority. In detail, the Catamaran speed setting is incremented from 0.4 m/s to 0.6 m/s without payload, the average settling time is 6 seconds with the average error speed 0.071 m/s in the set speed 0.6 m/s. For setting speed increased by 0.4 m/s to 0.6 m/s with payload, settling time gets longer, 7 to 13 seconds with the average error speed 0.01 m/s in the set speed 0.06 m/s. It performs small errors and fasts settling time. The ship model has experimented on an artificial pond, it is related to the proportional small sea wave. The research also shown the ratio of electric power consume toward speed setting is in exponential formula
Formation of the quality and shelf life of bread through the addition of rowanberry powder
Authors: Samilyk Maryna , Demidova Evgenia , Nazarenko Yuliya , Tymoshenko Artem , Ryzhkova Taisia , Severin Raisa , Hnoievyі Ihor , Yatsenko Ivan
Published: July 2023

The object of the study is bread made from medium rye flour enriched with rowan powder. The study is devoted to the formation of quality and increase of the shelf life of bread. The technology of obtaining powder from Sorbus aucuparia involves freezing fruits, preliminary dehydration by osmotic dehydration, drying and grinding. It was found that rowan powder contains the highest amount of potassium (860 mg/100 g) and 6.7 % crude fiber. Rowan powder contains 1.72 mg/100 g of vitamin C, which gives it antioxidant properties. The experimental samples of bread from medium rye flour were made by the liquid sponge method. Rowan powder was added to samples D1, D2, and D3 in an amount of 5, 10, and 15 %, respectively. The control sample (C) was made according to a standard recipe. The analysis of the physicochemical parameters of bread quality showed that with an increase in the amount of rowan powder added, the acidity of the samples increased, but did not exceed the standard values. Rowan powder did not significantly affect the moisture content of the bread crumb. With the addition of 5 and 15 % powders, the moisture content was 46.7 and 46.6 %, respectively. In sample D2, which contained 10 % rowan powder, the moisture content was the lowest – 45.9 %. The effect of rowan powders on the storage ability of rye flour bread was investigated. It was found that mold appeared on the surface of sample C on the 5th day of storage. In the sample with a rowan powder content of 5 % – on the 12th day of storage, with a powder content of 10 % – on the 21st day of storage. On sample D3, mold was observed on the 16th day of storage. These results indicate that rowan powder can be used as a natural preservative that can significantly increase the shelf life of rye flour bread
Defining the prerequisites for effective innovative activity of Ukrainian organizations in the context of acquiring competence on the European market
Authors: Gruzina Inna , Kozyrieva Olena , Mazorenko Oksana , Myronova Olga , Pererva Ivanna
Published: July 2023

The object of research is the innovative activity of organizations. Papers that consider the assessment of the benefits of Ukraine's accession to the European Union (EU) ignore innovation activity in the context of acquiring competence for the integration of organizations into the European space. This predetermined the study to assess the state and prerequisites for effective innovation activity of Ukrainian organizations. An uneven concentration of innovative organizations by types of economic activity has been determined, which is explained by imperfect mechanisms for regulating regional development. The negative dynamics of the science intensity of the gross domestic product (GDP) of Ukraine (by 0.32 %), its lowest level among the EU countries (0.99 %) were noted. This makes it impossible to compete with supplier countries of new technologies and products with a high degree of added value. A reduction in the cost of fundamental research and the number of innovative organizations (by 72.09 %), a decrease in the number of employees engaged in scientific research was identified. The smallest amounts of funding for employee training in accordance with EU requirements have been determined, which reduces the competitiveness of the economy.
A distinctive feature of the study is its standpoint of the influence of indicators on the formation of conditions for the acquisition of competence by organizations in the European market. This means the technological renewal of production, intensification of research into the latest areas of science, achievement of intellectual leadership, reorientation of finance to investment in human capital. The results are useful for executives who, on the way to joining the European space, seek to successfully overcome the barriers of the world's largest market owing to organizational competence
Determining the residual service life of polymer-modified asphalt concrete pavement on road bridges
Authors: Onyshchenko Artur , Kovalchuk Vitalii , Zagorodniy Olexiy , Moroz Vadym
Published: July 2023

The object of research is the asphalt pavement of road bridges. Its residual period was assessed taking into account the joint effect of the ambient temperature and vehicles.
It has been established that a set of negative factors affects the reduction of the service life (residual resource) of asphalt pavement on bridges. These include different modulus of elasticity of reinforced concrete base and asphalt pavement and the difference in coefficients of linear thermal expansion. As well as loads from the wheels of vehicles, temperature fluctuations, alternating freezing-thawing of water in pores and damaged places.
It was found that one of the reasons for reducing the residual life of asphalt pavement on reinforced concrete road bridges is the insufficient study and use of polymers in order to adjust the properties of asphalt concrete.
Taking into account the joint influence of temperature and transport in assessing the crack resistance of asphalt pavement on reinforced concrete road bridges would allow a more objective assessment of the residual life of such coatings and their service life. Arrangement of asphalt pavement with improved properties, due to polymeric latex, could increase its residual life. This, in turn, would lead to a reduction in costs for the repair and maintenance of not only asphalt pavement but also the road bridge as a whole
Substantiating the expediency of using hydrogen fuel cells in electricity generation
Authors: Boichenko Sergii , Danilin Oleksandr , Shkilniuk Iryna , Yakovlieva Anna , Khotian Artem , Pavlovskyi Maksym , Lysak Roksolana , Shamanskyi Sergii , Kryuchkov Anatoliy , Tarasiuk Oksana
Published: July 2023

The object of research is the process of using a hydrogen fuel cell to generate and accumulate electricity. The study highlights the feasibility of using a hydrogen fuel cell to provide electrical load.
The potential of using hydrogen as an alternative energy source was evaluated. SWOT analysis was used as a research method, based on the results of which recommendations were developed. The proposed measures could be taken to increase the use of hydrogen energy as an alternative to traditional energy sources.
The use of hydrogen technologies in an administrative building connected to an existing electrical network was analyzed.
The economic and environmental aspects of the use of hydrogen fuel cells to meet the demand for electrical load were investigated. Six schemes of energy supply of the building and comparing them to select the optimal solution have been developed. In the study, the assessment tool was the Hybrid Optimization of Multiple Energy Resources (HOMER) software.
The considered schemes were evaluated in accordance with a single generalized indicator. As a result, it was determined that the use of a hydrogen fuel cell could increase the efficiency of the traditional system by 85 %. For renewable energy systems, there was an increase in efficiency of 7 % (for the wind generator) and 10 % (for the photocell).
The practical use of the results will contribute to the efficiency of the process of electricity production by equalizing the stability of energy supply in hybrid systems. The economic and environmental assessment conducted demonstrates the prospects of using a hydrogen fuel cell. This assessment is designed to strengthen consumer confidence in the use of hydrogen fuel cells and hydrogen in general
Revealing the peculiarities of asymmetry and kurtosis coefficients of gas medium parameters in premises during fire
Authors: Pospelov Boris , Meleshchenko Ruslan , Bezuhla Yuliia , Chubko Larysa , Kornienko Ruslan , Kozar Yurii , Datsenko Liudmyla , Bilotil Oleksandr , Pysarevskyi Serhii , Tishechkina Kateryna
Published: July 2023

The object of the study is the coefficients of asymmetry and excess of the selective distribution of hazardous parameters of the gas environment during material fires. The practical importance of the research lies in the use of measures of asymmetry and kurtosis for early detection of fires. The measures of asymmetry and kurtosis for sampling the final size of an arbitrary dangerous parameter of the gas environment are substantiated. The proposed measures make it possible to investigate the peculiarities of the coefficients of asymmetry and kurtosis in relation to the selective distribution of an arbitrary dangerous parameter of the gas environment. At the same time, it becomes possible to numerically determine the degree of difference of the sample distributions of dangerous parameters from the Gaussian, as well as the features of such measures. Experiments were conducted to determine the degree of asymmetry and excess of dangerous parameters of the gas environment in the laboratory chamber at the intervals of the absence and presence of ignition of the test materials. The obtained results indicate that on the intervals of absence and presence of fires, the selective distributions of dangerous parameters of the gas environment differ from the Gaussian distribution. Distributions are complex and individual in nature. Features of measures of asymmetry and kurtosis depend on the type of ignition material. It was established that the maximum values of the modulus of increase in the degree of asymmetry are characteristic for the carbon monoxide concentration (2.939) during the ignition of paper, for the smoke density (3.098) during the ignition of textiles, as well as for the temperature during the ignition of alcohol (7.163) and wood (1.06). It was determined that the maximum values of the modulus of excess measure increase are characteristic for smoke density (4.678) when paper, wood (1.652) and textiles (28.932) ignite, as well as for temperature (49.377) when alcohol ignites
Developing a convolutional neural network for classifying tumor images using Inception v3
Authors: Mahmood Ali A. , Sadeq Sadeer , Aljanabi Yaser Issam , Sabry Ahmad H.
Published: July 2023

Deep learning algorithms rely on digital pathology to classify tissue tumors, where the whole tissue slides are digitized and imaged. The produced multi-resolution whole slide images (MWSIs) are with high resolution that may range from about 100,000 to 200,000 pixels. MWSIs are often stored in a multi-resolution configuration to simplify the processing of images, navigation, and efficient exposition. This work develops a network for classifying MWSIs that require high memory employing a deep neural Inception-v3 architecture. This work employs the MWSIs from Camelyon16, which is around 451 GB in size of Challenge dataset from two independent sources including 400 MWSIs as a total of lymph nodes. The training dataset contains 111 MWSIs of tumor tissue and lymph nodes and 159 WSIs of normal lymph nodes. The developed model uses sample-based processing to train extensive MWSIs employing the MATLAB platform. The model introduces transfer learning techniques with an Inception-v3-based architecture to categorize separate samples as a tumor or normal. Therefore, the main aim here is to achieve two-classes binary segmentation containing normal and tumor. This includes creating a new fully connected layer for the Inception-v3 architecture with two classes and compensating new layers instead of the original final fully-connected layers. The results obtained demonstrated that the heatmap visualization can recognize the boundary coordinates of ground truth as sketchy Region Of Interest (ROI), where the green boundary represents the normal regions and the tumor area with red boundaries. The proposed Inception v3 Convolutional Neural Network (CNN) architecture can achieve more than 92.8 % accuracy for such MWSIs dataset to categorize brain tumors into normal and tumor tissue
Improving the technique of protecting concrete floors in poultry houses
Authors: Fotina Tatiana , Petrov Volodymyr , Havryliuk Hryhorii , Liashenko Yurii , Varenyk Liudmyla
Published: July 2023

The object of the study was concrete floors in a poultry house with different types of litter. The paper addressed the problem of reducing microorganism contamination of concrete floors in poultry houses to prevent biological corrosion.
Corrosion of the surface of the concrete floor in the form of the formation of calcium oxalate monohydrate crystals was established by scanning electron microscopy; microscopic fungi: A. pullulans, F. sporotrichioides, and A. niger were detected. The TPD MS method established that concrete samples obtained in a room with straw lose moisture by 51.52 % more, with granules – by 342.42 % (р≤0.05), with shavings by 6.06 %, compared to control. CO from concrete samples is released less with sawdust litter by 86.40 %, with straw – by 83.49 %, with shavings – by 76.69 %, with granules – by 69.90 % (р≤0.05). The CO2 content in concrete samples from the room with sawdust was lower by 86.88 % (р≤0.05), with straw – by 55.73 %, with shavings – by 38.52 %, with granules – by 23.77 %, compared to control without litter.
Microbiological studies have established that 48 hours after disinfection, the total number of colonies of microorganisms on a concrete floor with a sawdust litter likely decreased by an average of 90.19 %, straw – by 91.62 %, shavings – by 79.76 %, granules – by 82.88 % (р≤0.05), in the control – by 83.73 %. It can be argued that the disinfectant destroys microorganisms on the concrete surface regardless of the type of substrate.
The peculiarity of the experiment was the use of scanning electron microscopy and TPD MS methods to study structural changes in concrete. The research is distinguished by the use of a powdered disinfectant to reduce microbial damage to a concrete floor with different types of litter.
The results of the experiment could be used in the aggressive environment of poultry houses to reduce the impact on concrete structures
Method for identifying the strength characteristics of concrete of a reinforced concrete crossbar during heating under conditions of fire
Authors: Pozdieiev Serhii , Nekora Olga , Fedchenko Svitlana , Zaika Nataliya , Shnal Taras , Subota Andriy , Nesukh Mykhailo
Published: July 2023

This paper proposes a method that makes it possible to study the patterns of changes in the concrete strength of reinforced concrete crossbars depending on the heating temperature under fire conditions by interpreting the results of their standard fire tests. For the implementation of this method, it is proposed to use similar data obtained using mathematical modeling based on the finite element method and given material properties, including the curve of concrete strength reduction recommended by the guidelines, as data included in the set of measurement results during fire tests depending on temperature. Such data are time dependences of temperature indicators at individual cross-section points and time dependence of the maximum deflection of the crossbar. The article proposes an interpolation method that makes it possible to set the temperature at any point of the section based on the approximation of the isotherms by parabolas with a variable indicator of their power. A method based on the mathematical interpretation of temperature indicators obtained using the proposed interpolation method and the curve of the dependence of the maximum deflection on time using a deformation model for describing the stress-strain state is proposed to identify the dependence of the concrete strength of reinforced concrete crossbars.
The work also shows that the results obtained using the proposed method of identifying concrete strength reduction coefficients are adequate as their relative error is on average no more than 7 %. Based on the results, the possibility of its application to study the regularities of the decrease in the strength of reinforced concrete crossbars under fire conditions has been proven
Improving the technology for ensuring the magnetic cleanliness of small spacecraft
Authors: Getman Andriy
Published: July 2023

The object of this study is the technology of ensuring magnetic cleanliness when applied to small spacecraft (SC) with overall dimensions of ~1 m in terms of minimizing the effect of magnetic interference on the on-board magnetometer. As part of solving the general problem of increasing the reliability of spacecraft, the task of improving the technology of magnetic cleanliness is considered. It is shown that the use of the multi-dipole model for the calculation of ~50 nT magnetic interference is limited in the design of small space vehicles that have an increased installation density. The expediency of using a model of its spherical harmonics instead of a multi-dipole model to represent the magnetic field of satellite components was theoretically justified. For the practical application of the model, the budgeting of the projections of the magnetic induction of hindrance to the onboard magnetometer according to the experimentally determined coefficients of the dipole, quadrupole and octupole spherical harmonics is proposed. An algorithm for calculating the coordinates of the location and projections of the magnetic moment of the dipole source inside the satellite based on the results of measuring the coefficients of spherical harmonics of its components is proposed. The possibility of representing the coefficients of the spherical harmonics of the magnetic field of the entire satellite in the form of the sum of the listed corresponding coefficients obtained during field measurements of the components is theoretically justified. It is proposed to use the difference between the calculated and measured values of the corresponding coefficients as a criterion for the quality of the work to ensure magnetic cleanliness. If the proposed procedure is used in the space industry, the quality of ensuring the magnetic cleanliness of small space vehicles can be increased, thereby improving the reliability of their operation in orbit
Accounting and analytical provision of enterprise risk management in the conditions of the state of war: identification, assessment, measurement and display of risks
Authors: Karpushenko Maria , Momot Tetiana , Mizik Yuliia , Shapoval Galyna , Karpushenko Oleg
Published: July 2023

The research is dedicated to the current issue of improving the accounting and analytical support for enterprise risk management in conditions of a military state. It analyzes the processes of risk identification, assessment, measurement, and representation in financial reporting, taking into account International Accounting Standards and qualitative assessments.
A conceptual approach is proposed to enhance the enterprise risk management process through the detailed implementation of three blocks of analytical procedures: research and identification, risk assessment, analysis, and neutralization, which involves its integration into the accounting and analytical support system for enterprise risk management. Based on the analysis of reporting of Ukrainian enterprises, the most common risks arising in modern conditions are identified. A classification of risks by their origin is proposed, allowing for the systematization of various types of reserves, provisions, and funds that are formed to reflect risk events in accordance with accounting standards. The analytical and applied support for risk representation in accounting is improved through the development of an analytical matrix of risk impact on events in reporting. It enables the consolidation of information on the likelihood and significance of risks in a unified format and establishes the appropriateness of reflecting reserves and provisions in accounting. The research results have practical significance and can be utilized by enterprises to enhance their risk management systems and effectively represent risk events in financial reporting, which will contribute to risk reduction and minimizing losses for enterprises in conditions of a military state
Influence of the monomer form of orthosilicic acid on the stability of polyalumosilicon coagulants and their efficiency in the treatment of drinking water
Authors: Mandryka Artem , Pasenko Oleksandr , Vereschak Viktor , Osokin Yevhen
Published: July 2023

The object of the study was polymeric alumino-silicon coagulants modified with the monomeric form of orthosilicate acid. The methods and precursors for obtaining stable solutions of composite alumino-silicon coagulants, as well as the effectiveness of coagulation treatment of a surface source of drinking water, were considered. The samples were obtained in two ways:
1) partial hydrolysis of medium-basic aluminum polyhydroxychloride together with sodium silicate solution (PolyAKKg);
2) mixing highly basic aluminum polyhydroxychloride together with a ready solution of orthosilicic acid with a high (above 50 %) monomer content (PolyAKKz).
In the course of research, the problem of the short shelf life of composite alumino-silicon coagulants was solved, which had prevented their industrial implementation in drinking water preparation processes.
It was established that the resulting composite coagulants had the following parameters: Al2O3, 8.075–8.725 %; SiO2, 0.058–0.725 %; Al/Si ratio, 20–250; basicity, 41.4–80.7 %. The effectiveness of the obtained composite coagulant and commercial coagulant was tested under laboratory conditions at a surface source of drinking water by reducing turbidity and by the concentration of residual aluminum in the water after coagulation. The results showed that composite coagulants of the PolyAKKz type with the addition of orthosilicic acid with a high monomer content (above 50 %) obtained using methanesulfonic acid hydrolysis as a precursor have higher solution stability compared to other precursors or coagulants of the PolyAKKg type.
The study results could be used to design new composite coagulants for the preparation of drinking water from surface sources with high turbidity
Determining the efficiency of using led sources of ultraviolet radiation for ionization and disinfection of room air
Authors: Glyva Valentyn , Nazarenko Vasyl , Burdeina Nataliia , Leonov Yuriy , Kasatkina Natalia , Levchenko Larysa , Tykhenko Oksana , Krasnianskyi Grygorii , Petrunok Tetiana , Biruk Yana
Published: July 2023

This paper reports a study into the possibility of using LED systems of ultraviolet radiation for air ionization and disinfection of air and indoor surfaces in the presence of people. It has been established that UV LED lamps with 120° opening angles have parameters under which radiation intensity does not exceed 30 J/m2 at distances of 2 meters. Based on experimental data, a methodology for designing the placement of lamps in the room was devised, which meets the requirements of the SBM-2015 standard and the European Directive 2006/25/EU. The use of LED emitters with a total intensity of up to 25 J/m2 increases the concentration of aero ions. The background concentrations were 140‒180 cm-3 (positive) and 160‒190 cm-3 (negative). The minimum permissible level is 500 cm-3. As a result of irradiation, the concentrations were 1100‒1460 cm-3 (positive) and 1260‒1470 cm-3 (negative). The influence of the recirculator-air purifier on the concentration of aero ions has not been established. The ionization process began immediately after turning on the irradiation systems in the entire volume of the premises (4‒5 meters from the source). The dynamic equilibrium of aero ion concentrations was established within 10‒15 minutes after the irradiation was switched on. The presence of a large number of people (up to 0.97 m2 per person) did not affect the concentration of aero ions. Under the combined effect of ultraviolet radiation and a recirculator-air purifier, the number of mold fungi colonies decreased by 20 times. Under the influence of only ultraviolet radiation – by 2.3 times. The decrease in the number of microbes under the combined effect was 1.6 times, and under the effect of only ultraviolet radiation – 2.8 times