bluuebunny/crossref_metadata_2025 huggingface dataset:
Liming and phosphate fertilization in seedlings formation of cagaiteira
Authors: Calsavara Rocha Camila , Alves da Silva Gilma , De Oliveira Ferreira Eric Victor , Rufini José Carlos  Moraes , De Almeida Vasconcelos Aline , Fagundes Miriã Cristina Pereira
Published: December 2024

The cagaiteira (Eugenia dysenterica DC.) is an important fruit species native from Brazilian Cerrado that has economic potential for food and pharmaceutical sectors and the recovery of degraded areas. Knowledge about crop management is still limited, including fertilization methods. This study aimed to evaluate the effect of lime and phosphorus (P) application on nutrition, growth, dry matter production and physiological aspects of cagaiteira seedlings. The experiment was carried out in a randomized block design with three replications, in a 5x4 factorial scheme, five base saturation levels (24.5, 40, 60, 80 and 100%) and four P rates (0, 100, 200 and 400 mg dm-³). At 180 days after transplanting, gas exchange, biometrics (diameter, height and leaf area), dry mass production, seedling quality (Dickson Quality Index - DQI) and nutrient content were evaluated. The results were subjected to analysis of variance (p
Filtrado do meio de cultivo do cogumelo Pycnoporus sanguineus no controle de Alternaria sp.
Authors: Pereira Leonel Bismarck Belo , Jesus Michele Santos de , Correia David Patrick Almeida , Villwock Ana Paula Schervinski , Viégas Pedro Roberto Almeida , Marino Regina Helena
Published: December 2024

O emprego de micro-organismos no controle de fitopatógenos é uma alternativa ecológica aos pesticidas sintéticos, pois não causam contaminação ambiental. O objetivo deste trabalho foi avaliar a atividade antifúngica do Pycnoporus sanguinues (PS) sobre o crescimento micelial do fungo fitopatogênico Alternaria sp. (ALT), em dois bioensaios. No primeiro bioensaio foi utilizado o delineamento experimental inteiramente casualizado no esquema fatorial de 4 x 5, correspondente ao cultivo dos isolados fúngicos em quatro tratamentos: PS - testemunha PS; ALT - testemunha ALT; ALT x PS - ação de ALT sobre PS; e PS x ALT - ação do PS sobre ALT, durante cinco dias de avaliação (2º ao 6º dia de cultivo) com quatro repetições por tratamento. No segundo bioensaio foi utilizado o delineamento experimental inteiramente casualizado no esquema fatorial de 4 x 4, correspondente a quatro tratamentos: Test-15: testemunha com 15% do meio de cultura utilizado para obtenção do filtrado fúngico, sem inoculação fúngica; Test-30: testemunha com 30% do meio de cultura utilizado para obtenção do filtrado fúngico, sem inoculação fúngica; PS-15: 15% de filtrado do meio de cultivo de PS; e PS-30: 30% de filtrado do meio de cultivo de PS durante quatro dias de avaliação (2º ao 5º dia de cultivo) com três repetições por tratamento. O Pycnoporus sanguineus inibe o crescimento micelial do fungo fitopatogênico Alternaria sp., a depender do tempo de cultivo. O emprego de 15% e 30% do filtrado do meio de cultivo de P. sanguineus inibe o crescimento micelial de Alternaria sp.
Atributos físicos de um planossolo sob sistemas integrados de produção agropecuária no semiárido Paraibano
Authors: Sousa Neto Abraão Targino de , Oliveira Flávio Pereira de , Silva Pedro Luan Ferreira da , Campos Milton César Costa , Francisco Paulo Roberto Megna
Published: December 2024

O objetivo do presente estudo foi analisar a qualidade física de um Planossolo em ambiente semiárido sob sistemas integrados e convencionais de produção agropecuária após o período de oito anos de condução e verificar se as propriedades físicas do solo sob pastoreio respondem de distintamente aos diferentes sistemas de produção avaliados. O experimento está sendo conduzido desde o ano de 2015, em Alagoinha, Paraíba, sob um Planossolo Háplico. Os tratamentos foram compostos por: Urochloa decumbens + Ipê (BI); Ur. decumbens + Gliricídia (BG); Ur. decumbens + sabiá (BS); Ur. decumbens + milho (L) e Ur. decumbens (B). As amostras de solo foram coletadas no ano de 2022, nas camadas de 0-10, 10-20 e 20-30 cm de profundidade para determinação da densidade do solo (Ds), porosidade total (PT), macroporosidade (Mac), microrosidade (Mic) e condutividade hidráulica saturada (K?). Os dados foram submetidos à análise de variância e análise de componentes principais (ACP) (p
Produtividade e qualidade de frutos de pepino com bioativador de solo e mulching orgânico
Authors: Paulus Dalva , Minatti Leandro , Luckmann Balbinotti de França Daiane , Becker Dislaine
Published: December 2024

A cultura do pepino (Cucumis sativus) se apresenta como alternativa de diversificação de renda para agricultura familiar. Para essa cultura o uso de bioativadores de solo e mulchings podem resultar em ganhos de produtividade e frutos de qualidade, contribuindo para uma agricultura sustentável. O objetivo da pesquisa foi avaliar a temperatura e umidade do solo, crescimento, produtividade e a qualidade do pepino com a utilização de bioativador de solo e mulching orgânico. O experimento foi em delineamento inteiramente casualizado, em esquema fatorial, onde fator 1 bioativador com e sem aplicação de bioativador, e o fator 2 mulching, formado com solo coberto pela aveia preta e sem mulching, com cinco repetições. A cultivar de pepino avaliada foi Amour. Verificamos que a presença do mulching orgânico conserva a umidade do solo na camada de 0-20 e 20-40cm e reduz a temperatura do solo, o que favoreceu a retenção de umidade e conforto térmico para as plantas nos horários mais quentes do dia. A altura de planta (350,03 cm) e o índice relativo de clorofila (54,00) foram significativamente maiores no cultivo com mulching e bioativador de solo. Da mesma forma ocorreram aumentos na massa fresca total de frutos (2,25 kg planta-1), de produtividade (55,6 t ha-1), teor de sólidos solúveis (5,75%) e acidez total titulável (0,14%), resultando em frutos mais doces e de qualidade para indústria de conserva. O bioativador de solo e o mulching com cobertura orgânica (palha de aveia) reduziram a temperatura do solo, e contribuíram para ganhos de produtividade e qualidade dos frutos, sendo práticas de manejo sustentáveis para a cultura do pepino.
Determination of antimicrobial resistance genes in patients with infected miscarriage. A rapid identification and optimized empirical therapy
Authors: Tsechoeva Leila Sh. , Bezhenar Vitaly F.
Published: December 2024

BACKGROUND: The infectious factor during pregnancy remains the leading cause not only of maternal mortality, but also of premature pregnancy loss and subsequent reproductive function impairment. Patients with infected miscarriage represent a special cohort in terms of complexity of clinical decision-making, while the choice of antimicrobial chemotherapy is particularly difficult in conditions of accumulation of scientific knowledge about the main microbial agents. For adequate treatment, it is essential to use all modern methods of microbiota diagnosis and conduct regular monitoring of microorganism resistance in order to update empirical schemes of antibacterial therapy.
AIM: The aim of this study was to evaluate the correlation relationship between antimicrobial resistance genes and identified microbial agents in patients with infected miscarriage in order to optimize empirical antimicrobial chemotherapy.
MATERIALS AND METHODS: We prospectively studied 42 samples of genital tract discharge in patients with infected miscarriage. The classical culture method was used to determine microorganism sensitivity to standard antibacterial drugs by the disc diffusion test. A molecular genetic study of the species composition of clinically significant microbial agents and genes of resistance to β-lactam and glycopeptide antibiotics was performed using Femoflor Screen and BakRezista GLA test systems (“DNA-Technology” LLC., Russia), respectively.
RESULTS: In the cultural study, one microbial agent was identified in 59.5% of cases, two in 40.0% of cases, and three in 7.1% of cases. The following microorganisms were most frequently identified: Enterococcus spp. in 25.0% of cases, Esherichia coli in 16.7% of cases, and Candida spp. in 11.7% of cases. During the molecular genetic study, Lactobacillus spp. were identified in 64.3% of the samples, the microorganisms associated with bacterial vaginosis in 45.3% of the samples, Candida spp. in 23.8% of the samples, and Herpesviridae family viruses in 14.3% of the samples. In 45.2% of the samples, one to 14 genes of resistance to β-lactam and glycopeptide antibiotics were identified, while Tem (19.0%), Oxa-40-like (19.0%), Stx-M1 (14.3%), Ges (14.3%), Oxa-51-like (11.9%), and Van A/B (9.5%) were most frequently determined in the samples positive for resistance genes. Comparison between phenotypic susceptibility testing and genetic prediction for antibiotics resistance demonstrated that the specificity varied from 96.4 to 100%, and the sensitivity from 40.0 to 85.7%.
CONCLUSIONS: The use of molecular genetic diagnostic methods allows for the identification of clinically significant urogenital tract infections and the detection of markers of their resistance to β-lactam antibiotics and glycopeptides in the shortest possible time. The data obtained make it possible to optimize the initial antimicrobial chemotherapy.
Dynamics of blood adipokine levels and their ratios in assisted reproductive technology programs depending on the clinical pregnancy onset
Authors: Ryzhov Julian R. , Makhmadalieva Manizha R. , Lesik Elena A. , Komarova Evgeniia M. , Ishchuk Mariia A. , Tapilskaya Natalia I. , Gzgzyan Alexander M. , Bespalova Olesya N.
Published: December 2024

BACKGROUND: The adipokines leptin, adiponectin, and ghrelin are expressed not only in adipose tissue but also in the hypothalamic-pituitary-gonadal axis organs and the uterus. They regulate the gonadotropin-releasing hormone and gonadotropin secretion, steroidogenesis, folliculogenesis, and implantation, and serve as promising markers of assisted reproductive technology program outcomes.
AIM: The aim of this study was to evaluate the dynamics of blood adipokine levels and their ratios during the controlled ovarian hyperstimulation in assisted reproductive technology programs depending on the onset of clinical pregnancy.
MATERIALS AND METHODS: This study involved 51 patients undergoing infertility treatment using assisted reproductive technology in a short protocol with gonadotropin-releasing hormone antagonists. Depending on the onset of clinical pregnancy, two study groups were formed: non-pregnant (group 1, n = 22) and pregnant (group 2, n = 29). Blood leptin, adiponectin, and ghrelin levels were assessed using enzyme immunoassay at three points: assisted reproductive technology protocol start-up, the day of oocyte pick-up, and the day of embryo transfer.
RESULTS: On the day of oocyte pick-up, patients in group 1 had higher leptin levels (5.47 ± 1.92 vs. 3.76 ± 0.75 ng/ml; p = 0.0004), leptin/adiponectin ratios (11.45 ± 4.50 vs. 4.73 ± 1.08; p 0.001), and leptin/ghrelin ratios (0.43 ± 0.17 vs. 0.24 ± 0.07; p 0.001). On the day of embryo transfer, patients in group 1 had higher levels of leptin (6.37 ± 2.13 vs. 3.29 ± 1.21 ng/ml; p 0.001) and adiponectin (0.75 ± 0.22 vs. 0.60 ± 0.09 ng/ml; p = 0.001), as well as ratios of leptin/adiponectin (9.06 ± 3.73 vs. 5.59 ± 2.32; p 0.001), leptin/ghrelin (0.48 ± 0.15 vs. 0.20 ± 0.07; p 0.001), and adiponectin/ghrelin (0.06 ± 0.02 vs. 0.04 ± 0.01; p 0.001).
CONCLUSIONS: The data obtained indicate that blood adipokine levels change during the controlled ovarian hyperstimulation in assisted reproductive technology protocols depending on clinical pregnancy and can be used to predict its onset.
In vitro model of premature ovarian insufficiency based on cyclophosphamide-induced mitochondrial dysfunction in granulosa cells
Authors: Zakuraeva Karina A. , Yarmolinskaya Maria I. , Vinokurov Andrey Yu. , Pogonyalova Marina Yu.
Published: December 2024

BACKGROUND: Currently, there is no unified approach or effective method for treating premature ovarian insufficiency. The primary strategy is hormone replacement therapy aimed at mitigating estrogen deficiency and its associated complications. However, this therapy does not restore lost ovarian function or fertility. Thus, further research into the pathogenesis of premature ovarian insufficiency is crucial for developing alternative pathogenetically based therapies. Investigating the efficacy of various drugs in preclinical trials using cellular models holds significant promise. Experimental modeling of premature ovarian insufficiency, which closely replicates the origin and development mechanism of the human disease, can be effectively used to develop promising therapeutic approaches, in particular, for testing new drugs.
AIM: The aim of this study was to develop a new method for experimental modeling of premature ovarian insufficiency using cyclophosphamide in Wistar rats, the significant advantages of which are high reproducibility, ease of implementation, and cost-effectiveness.
MATERIALS AND METHODS: A culture of Wistar rat ovarian granulosa cells after five stages of subculturing was treated with the drug cyclophosphamide, ensuring a working concentration in the growth medium of 0.1 mg/ml, followed by incubation for six hours.
RESULTS: A cellular model of premature ovarian insufficiency has been created, which is characterized by 100% modeling efficiency, high manufacturability and environmental safety for modeling the pathological condition.
CONCLUSIONS: The model created will allow for testing the medicinal effectiveness of chemicals with a view to their further use in medicine.
Comparative features of thymus morphology in human and vertebrate animals (Chordata, Vertebrata)
Authors: Yurchinsky Vladislav Ya. , Erofeeva Lyudmila M.
Published: December 2024

BACKGROUND: It is well known that the thymus structure in the vertebrate phylogeny is characterized by a combination of conservative and highly plastic features. However, the question remains about the causes and patterns of evolutionary similarities and differences in human and animal thymus structure depending on level of organization, habitat, and adaptability.
AIM: The aim of the study was to identify the main patterns of change in the thymus microscopic structure in phylogeny by comparing the thymus structure in humans and various Chordata species.
MATERIALS AND METHODS: Light microscopy was used to determine the cortical/medullary and mitotic indices as well as the area of fibrous tissue, lymphoid tissue, and adipose tissue in thymus sections from 19 vertebrate species and humans. Thymocytes, thymic corpuscles, and the number and area of microcirculatory vessels were counted per conventional area unit. The study was conducted on immature animals of each species as well as on animals that had reached the second stage of maturity.
RESULTS: Comparative analysis shows that immature animals have predominantly similar thymus structures. Significant differences were observed in the parameters of age-related involution, which is characterized by significant magnitude and total fat degeneration in humans compared to animals. The morphological features of the thymus associated with thymocyte migration and maturation have the highest conservatism and include cortical/medullary and mitotic indices, the numerical density of thymocytes in the cortex, the total area of microcirculatory vessels, the relative area of lymphoid tissue. Human thymus, regardless of age, has a higher relative amount of fibrous tissue than vertebrates. In addition, some specific morphological features of the thymus corpuscles also vary.
CONCLUSIONS: The structural features of the human thymus were determined that changed in adaptation to specific conditions of the anthropogenic environment. The revealed morphological differences in human thymus are consistent with immunological hypothesis explaining the causes of age-related thymic involution. They correspond to the main points of Academician A.A. Zavarzin’s theory of parallel development of homologous tissues in vertebrate phylogeny.
Sustainability of the Democratic System Versus Viral Disinformation Campaigns
Authors:   Linnaeus University, De La Brosse Renaud , Holt Kristoffer
Published: December 2024

Democracy as an experience of political organization is today undergoing multiple external attacks, and is the object of many internal criticisms. In this regard, one can imagine a City besieged by centrifugal forces, not least of which is the rise of the phenomenon of disinformation. There are many cities, like Kyiv or Dubrovnik, which are or have in the past been the target of disinformation campaigns that preceded and accompanied the assault of which they were the victims. Therefore, it seems necessary to review who are the actors and the vectors of disinformation today, to then examine who are the main targets and victims. Ultimately, this communication, in addition to the description of the phenomenon itself, also aims to review the responses that are provided by public actors to combat this scourge threatening the proper functioning of democratic deliberation.
Capa, créditos e sumário
Authors: Leite Alice Carvalho Diniz
Published: December 2024

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A passos curtos: a criança pedestre e o Rio de Janeiro em Dois amores, de Paulo Lins
Authors: Santini Juliana
Published: December 2024

Este artigo parte da hipótese de que, na narrativa Dois amores, publicada em 2019 por Paulo Lins, a representação do Rio de Janeiro é instrumentalizada pelo trânsito de dois persona- gens infantis. No texto, Dudu e Lulu são crianças que, ao longo de um dia, vendem balas pelas ruas da capital carioca para comprar um novo par de tênis que lhes garantiria uma boa apresentação diante das futuras namoradas no baile funk. Sob essa perspec- tiva, a cidade é representada a partir do deslocamento espacial dos meninos, o que coloca em questão, ainda, o modo como se dá o processo de apropriação dos espaços urbanos pelo pedes- tre. Tendo como ponto de partida a noção de “dialética da margi- nalidade”, proposta por João César de Castro Rocha (2006), esta reflexão aborda as práticas sociais e a violência reveladas pela narrativa, problematizada também a partir das características e dos limites da forma do conto em sua composição.
De Briseida para Aquiles
Authors: Avellar Júlia Batista Castilho de
Published: December 2024

Este trabalho propõe uma tradução poética, do latim para o português, da terceira carta das Heroides, de Ovídio, acompanhada de notas explicativas. Os dísticos elegíacos do latim foram vertidos para o português como um par de versos de 14 e 10 sílabas poéticas, e buscamos explorar a musicalidade na língua de chegada por meio do emprego de rimas em fim de verso. A tradução é precedida por um estudo introdutório sobre a terceira carta das Heroides, o qual analisa os diálogos com o intertexto homérico da Ilíada, a construção da imagem de Briseida como eu poético e a tensão poética entre os gêneros épico e elegíaco. O estudo contém, ao final, um comentário acerca das escolhas tradutórias e efeitos poéticos buscados na tradução para o português.
Fotografias da ruína
Authors: Roly Amanda Carraro Moraes
Published: December 2024

De acordo com Walter Benjamin (2012, p.243), seria tarefa do historiador “escovar a história a contrapelo”, na tentativa de trazer à tona as vozes silenciadas na escrita do passado. Em “Memórias de cego”, Derrida também propõe a escrita das entrelinhas, do que reside no silêncio. Para ele, o escrito se fiaria à sua memória, relatando o rastro deixado entre a representação e o representado (DERRIDA, 2010, p.52). Neste trabalho, proponho uma leitura do poema “Diving into de Wreck”, de Adrienne Rich, a luz dos conceitos de Derrida e Benjamin. Pretendo revisitar os sentidos atribuídos à metáfora do mergulhador e do mergulho, para discutir qual o papel do autor e da obra literária diante das catástrofes da história mundial no poema. Nessa chave de leitura, o mergulhador-poeta desceria em direção à ruína para fazer ouvidas as vozes silenciadas, que não foram registradas no “livro de mitos”.
Reflexões sobre o gesto
Authors: Castro Deborah Walter de Moura
Published: December 2024

Este trabalho tem como principal objetivo pensar em como alguns artistas – às vezes chamados de artistas conceituais – se utilizaram do gesto em suas obras a fim de apontar para um aspecto silencioso, em que palavras e imagens se confundem em uma prática indecifrável. Através de produções híbridas, nem tanto palavra nem tanto imagem, artistas evidenciam o gesto como uma maneira de suscitar a vulnerabilidade da linguagem verbal, de evidenciar a aproximação entre palavra e imagem, ou apenas como uma nova maneira de comunicar – de uma maneira que o leitor/espectador não consiga entender. Com trabalhos de Marcel Broodthaers, On Kawara, León Ferrari e Mira Schendel, visamos com este texto demonstrar as relações entre o gesto, a sugestão textual, o silêncio e o desejo de comunicar.
Memória como recurso diegético do drama contemporâneo
Authors: Medeiros Elen de
Published: December 2024

proposta analítica que fundamenta o presente artigo é de que a memória se torna um recurso diegético em certa produção dramatúrgica contemporânea. Tomando como referência duas dramaturgias de Newton Moreno, Agreste (Malva-Rosa) e Body Art, pretende-se explorar possibilidades de narratividade, encarada como epicização ou como rapsodização, pelo recurso da memória como dispositivo dramatúrgico. Como premissa, entende-se que a memória não é em si apenas conteúdo das peças, mas em especial um elemento instrumental para a formulação dessas estruturas dramatúrgicas. Nesse sentido, as obras em questão são referenciais exemplificadores para a hipótese que ora se delineia, que compreende a estrutura memorialística como formato dramatúrgico em si. No entanto, como elemento inerente à dramaturgia de Moreno, outro elemento estranho ao drama também se torna marcante e se entrelaça ao épico: o eu lírico.
A representação verbo-visual de Domingos Jorge Velho em Angola Janga
Authors: Ferreira Barros Uíni , Soares Martins Edson
Published: December 2024

O objetivo deste trabalho é analisar como o romance gráfico Angola Janga, de Marcelo D’Salete, constrói Domingos Jorge Velho, líder da milícia que destruiu o Quilombo dos Palmares, como o vilão da sua história.  Buscamos empregar o método de análise de verbo-visualidade sugerido por Beth Brait e conceitos desenvolvidos por Bakhtin e pelo Círculo para examinar a construção dos enunciados do romance gráfico. Ao longo do estudo, trataremos brevemente de algumas obras visuais que trabalharam o tema dos bandeirantes como heróis nacionais para perceber como D’Salete utiliza o mesmo grupo para produzir outras perspectivas sobre eles.
O desencantamento entre a perda e o vislumbre: imagens e fabulações críticas em “Perder a mãe”, de Saidiya Hartman
Authors: Fehlauer Paulo Marcelo
Published: December 2024

O artigo discute certas estratégias construtivas utilizadas pela escritora estadunidense Saidiya Hartman no livro Perder a mãe: uma jornada pela rota atlântica da escravidão. A obra narra a experiência da autora em Gana na busca por vestígios do comércio transatlântico de escravizados, pesquisa que se entrelaça com uma jornada pessoal em torno de lacunas presentes na própria genealogia. Para tanto, o artigo explora as noções de “desencantamento” e de “fabulações críticas”, propostas pela própria autora, especialmente a partir das relações estabelecidas entre o discurso textual e as fotografias entremeadas à narrativa, relações ambivalentes que reforçam o caráter ensaístico da obra, em que a autora se equilibra entre o coletivo e o pessoal. O cerne da discussão encontra-se na tensão entre a perda, presente desde o título, e a ocupação de lacunas nas quais se poderia vislumbrar um futuro.
Effects of atropine used as eye drops on tears, pupil diameter and intraocular pressure in rabbits
Authors: Çömez Mehmet , İşler Cafer Tayer
Published: December 2024

Objective: In this study; It was aimed to determine the effects of using atropine as eye drops on tear amount (STT), pupil diameter (PD), and intraocular pressure (IOP).
Method: STT, PD and IOP measurements were made before instillation of atropine and 30 minutes after instillation of atropine for seven days. Measurements were evaluated in the SPSS 25 statistical program.
Results: It was determined that the STT, PD and IOP measurement values of both left and right eyes of the atropine group were statistically significantly different compared to those who did not receive atropine (P
New characterizations of N(p,q,s) spaces on the unit ball of Cn
Authors: Beslikas Athanasios
Published: December 2024

In this note we provide Holland-Walsh-type characterizations for functions on the N(p,q,s) spaces on the unit ball for specific values of p≥1. Characterizations for the holomorphic function spaces N(p,q,s) were studied extensively by B. Hu and S. Li.
Cobalancing hybrid numbers
Authors: Rubajczyk Mariola , Szynal-Liana Anetta
Published: December 2024

Hybrid numbers are generalization of complex, hyperbolic and dual numbers. In this paper, we define and study hybrid numbers with cobalancing and Lucas-cobalancing coefficients. We derive some fundamental identities for these numbers, among others the Binet formulas and the general bilinear index-reduction formulas which imply the Catalan, Cassini, Vajda, d’Ocagne and Halton identities. Moreover, the generating functions for cobalancing and Lucas-cobalancing hybrid numbers are presented.
PREDICTION OF WELD-ABILITY CHARACTERISTICS OF DUAL-PHASE STEEL HCT600X BY NUMERICAL SIMULATION
Authors:   Department of Automotive Production, Faculty of Mechanical Engineering, Technical University of Kosice, EVIN EMIL , TEJC JOSEF ,   ESI Eastern Europe s.r.o, TOMAS MIROSLAV ,   Department of Automotive Production, Faculty of Mechanical Engineering, Technical University of Kosice, KOKARDA VLADIMIR ,   Carl Zeiss Slovakia, s.r.o
Published: December 2024

Dual-phase (DP) steel plates are characterized by very good absorption capacity, so they are used in the automotive industry for body deformation zone parts. They are attached to the frame of the car-body by welding. Laser welding of dual-phase steels is gaining increasing importance in the automotive industry. In the present paper, the possibility of predicting the strength and deformation characteristics of laser-welded HCT600X steel sheets was analyzed based on experiments and numerical simulations. Butt joints were formed by YLS-5000 laser in two variants, which differ by laser power input and welding speed. The HCT600X- HCT600X with welded joint was analyzed based on microstructure and mechanical tests. The tensile strength and hardness of the welded joints were greater than those of the base material (BM). The microstructure of the weld metal (fusion zone) consisted of martensite, austenite and bainite, in the heat-affected zone it consisted of a mixture of martensite, bainite, ferrite and residual austenite. In numerical simulation, the finite-element mesh was created by linear volume elements refined in the weld region, and the Gauss model of the surface heat source was applied when modelling laser welding. The results of numerical simulation of the microstructure and selected mechanical properties were correlated with the experimental results.
IMPLEMENTATION OF A DOUBLE-SHELL METAL HYDRIDE TANK INTO REAL BUS OPERATION AND ITS TEST RUNS
Authors:   Technical University of Kosice, Department of Energy Engineering and Department of Business Management & Environmental Engineering, Faculty of Mechanical Engineering, DUDA FILIP , JASMINSKA NATALIA ,   Technical University of Kosice, Department of Energy Engineering and Department of Business Management & Environmental Engineering, Faculty of Mechanical Engineering, LAZAR MARIAN ,   Technical University of Kosice, Department of Energy Engineering and Department of Business Management & Environmental Engineering, Faculty of Mechanical Engineering, BRETOVIC TOMAS ,   Technical University of Kosice, Department of Energy Engineering and Department of Business Management & Environmental Engineering, Faculty of Mechanical Engineering, MILENOVSKY PETER ,   Technical University of Kosice, Department of Energy Engineering and Department of Business Management & Environmental Engineering, Faculty of Mechanical Engineering, FILO MILAN ,   Technical University of Kosice, Department of Energy Engineering and Department of Business Management & Environmental Engineering, Faculty of Mechanical Engineering
Published: December 2024

Recently, the role of hydrogen technology has become more important in decarbonizing society and achieving carbon neutrality goals. The most important sector where it is possible to implement hydrogen technologies to achieve carbon neutrality is the automotive industry. For hydrogen technologies in the field of transport to be able to compete with conventional motor vehicles, research in several areas is necessary. One of the most important areas is the issue of hydrogen storage. The article in question discusses the issue of low-pressure hydrogen storage by means of metal hydride storage tanks for mobile applications and solves the design of a double-shell metal hydride storage tank using an active and passive cooling module and the subsequent implementation of the metal hydride storage tank in the real operation of a bus on which test runs were carried out and evaluated. From the test runs, it was found that research and development in the field of initial preheating of the metal hydride storage tanks in the bus is necessary for the efficient removal of hydrogen into the fuel cell.
RESEARCH OF THE RESISTANCE OF POLYCARBONATE SAMPLES MADE BY FDM TECHNOLOGY TO ABRASIVE ACTION
Authors:   Technical University of Kosice, Faculty of Mechanical Engineering, JEZNY TOMAS , MITAL GERHARD ,   Technical University of Kosice, Faculty of Mechanical Engineering, SPISAK EMIL ,   Technical University of Kosice, Faculty of Mechanical Engineering, GAJDOS IVAN ,   Technical University of Kosice, Faculty of Mechanical Engineering
Published: December 2024

The article deals with the investigation of tribological properties of polycarbonate (PC) material produced by 3D printing using Fused Deposition Modelling (FDM) technology under different layer deposition strategies and their subsequent testing for abrasive wear. The aim of the experiment was to compare the effect of different layer deposition strategies in the FDM process on the abrasive wear of the material at specified process parameters, which were defined according to ASTM G65 standardized tests. Based on these tests, the different strategies were compared and evaluated in terms of their ability to resist abrasive wear, providing insight into the effect of different orientations and layer arrangements on the tribological properties of 3D printed polycarbonate.
EVALUATION OF ELECTRON BEAM WELDED JOINTS PROPERTIES OF ADDITIVELY MANUFACTURED AND CONVENTIONAL ALUMINIUM ALLOYS
Authors:   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, VANDZURA RADOSLAV , GELATKO MATUS ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, HATALA MICHAL ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, BOTKO FRANTISEK ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, RADCHENKO SVETLANA ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov
Published: December 2024

Presented paper is focused on the experimental welding of aluminium alloys – the additively manufactured material AlSi10Mg and the conventional alloy AW-5754. The experimental electron beam welding was conducted in collaboration with First welding company, Inc. The objective of the experiment was to create a weld joint between aluminium alloys prepared by additive and conventional methods, evaluate the base materials, the heat-affected zones (HAZ), and the weld joint in terms of microstructure, as well as measure and assess microhardness.
ANALYSIS OF FRICTION STIR WELDING JOINTS ON HIGH DENSITY POLYETHYLENE (HDPE) DUE TO CHANGE IN MATERIAL TEMPERATURE AND SPINDLE ROTATION
Authors:   Mechanical Engineering Department, Brawijaya University, SUGIARTO DR. , SYAMSUL MA’ARIF MOCH. ,   Mechanical Engineering Department, Brawijaya University, WAHJUDI ARI ,   Mechanical Engineering Department, Brawijaya University, ICHSAN YOZIANTO MUHAMMAD ,   Mechanical Engineering Department, Brawijaya University
Published: December 2024

Friction stir welding (FSW) can be a solution in solving the problem of joining thermoplastic polymers which are difficult to do with fusion welding. Selection of the proper FSW connection parameters can produce optimal connection quality in HDPE material joints. In friction stir welding, the heat of welding is used to raise the temperature of the material from its initial state to the solid state temperature. If the material temperature (T0) is increased above room temperature (TRoom), while the FSW welding parameter is constant, then at a certain increase in T0 it will produce excess welding heat which results in excessive softening or even melting of the material being welded. Therefore, the material temperature setting (T0) becomes an important parameter FSW The process of connecting the HDPE plates with friction stir welding was carried out by varying the material temperature (T0 ) of TRoom, 50 0C, 75 0C and 100 0C. While the spindle rotation varies 2000 rpm and 2500 rpm. Other parameters controlled include the type of square butt joint, 5 mm HDPE plate thickness, 20 mm/min feed rate, 0.1 mm plunge depth, 20 mm tool shoulder diameter, 4.5 mm pin length and 6 mm pin diameter. The result is that the higher the spindle rotation and the material temperature during the welding process causes the FSW peak welding temperature to increase. The highest peak weld temperature was obtained at variations in material temperature (T0) 100 °C with a spindle rotation of 2500 rpm, which is 123.2 °C or 94% of the melting temperature of HDPE. The hardness of the weld nugged area is still lower than the hardness of the base material. The highest average tensile strength of the research variations was achieved at a spindle rotation speed of 2500 rpm and a material temperature of 75 °C of 16.8 MPa, higher than the average tensile strength of the base material which is 15.1 MPa.
SURFACE INVESTIGATION OF HIGH TEMPERATURE WEAR BEHAVIOR OF SS316L ALLOY PRODUCED BY LASER POWDER BED FUSION
Authors:   Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Kumar Navin , Chandrakumar Palanisamy ,   Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Murali Arun Prasad ,   Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Gautam Preeti ,   Department of Machining, Assembly and Engineering Metrology, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, Nemecek Petr ,   Department of Machining, Assembly and Engineering Metrology, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, Prusa Michal ,   Department of Machining, Assembly and Engineering Metrology, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava
Published: December 2024

This research investigates the tribological characteristics of SS316L produced through Laser Powder Bed Fusion (LPBF), emphasizing the influence of testing temperature, sliding velocity, and loading conditions. The findings demonstrate that the friction coefficient escalates with increased temperatures (150°C and 250°C), whereas the wear rate remains invariant, presumably attributable to the establishment of a lubricating surface layer. The rotational velocity of 300 revolutions per minute the Coefficient of Friction (COF) shown an upward movement although the wear rate remains constant. The findings underscore the importance of analyzing different parameters to understand the friction and wear properties of additively manufactured SS316L.
SELECTING WELDING SAFETY GOGGLES BY MULTI-CRITERIA DECISION-MAKING APPROACHES— A COMPREHENSIVE EVALUATION
Authors:   Department of Mechanical Engineering, Vel Tech Rangarajan Dr, Sagunthala R&D Institute of Science and Technology, Kalita Kanak , Balaji R ,   Department of Mechanical Engineering, Vel Tech Rangarajan Dr, Sagunthala R&D Institute of Science and Technology, Cepova Lenka ,   Department of Machining, Assembly and Engineering Metrology, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, Samal S P ,   Department of Biosciences, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Jangir Pradeep ,   University Centre for Research and Development, Chandigarh University
Published: December 2024

This paper presents a comprehensive application of the Multi-Criteria Decision-Making (MCDM) approach to evaluate and rank different models of welding goggles. The study uses both the Mean Weight and Entropy Weight methods in conjunction with five different MCDM techniques—TOPSIS, CODAS, COPRAS, SAW, and MOORA. These methods provide an insightful comparison and robust ranking of various goggle models. The analysis consistently highlighted 'ArcOne The Fly Safety Goggles' and '3M Speedglas 100 Series' as superior performers across multiple criteria.
Electronic records management in government departments and parastatals in Zambia
Authors: Muntanga Elijah , Bwalya Tuesday
Published: December 2024

Traditionally, records have existed as print sources of information. Therefore, many records in most government departments and agencies in many developing countries such as Zambia remain paper records. However, as countries push to implement the concept of e-governance, government departments and agencies are deploying electronic records management systems (ERMS) to manage electronic records. The study employed a survey research design, exploiting purposive sampling method to sample 50 government departments and parastatals. Data was collected from 42 records officers, registry clerks, or officers in charge of managing records through a questionnaire. The collected data was analysed quantitatively using the Statistical Package for Social Sciences (SPSS) version 23. The findings reveal that the majority 76% of government departments and parastatals in Zambia kept e-records. Only 24% indicated that they do not keep e-records. The study also shows that the adoption and use of ERMS in government departments and parastatals in Zambia is not widespread. For example, only 9.5% of government departments and parastatals in Zambia have deployed EDRMS commercial software such as TRIM and HP Records Manager. The study further established that inadequate funding was the greatest challenge towards the effective management of e-records, alongside issues such as the absence of clear policies, laws, and standards, lack of qualified staff, inadequate end user ICT infrastructure, and lack of senior management support and corruption.
Impact of ICT on academic libraries: Challenges for library professionals
Authors: Pagore Ranjeet Bhanudas
Published: December 2024

The implementation of Information and Communication Technology (ICT) has significantly enhanced the efficiency and effectiveness of service delivery within libraries. The integration of ICT resources is crucial in academic libraries as it facilitates resource sharing, improves service delivery, saves time, provides marketing opportunities for services, and ensures quick and easy access to information while keeping stakeholders updated. With the assistance of ICT, various tasks in academic libraries, such as accessioning, cataloguing, periodical control, stock verification, and information retrieval, can be performed more efficiently using specialized library software. library can provide communication services to user by means of Audio, Audio Visual, Tele textbook, Fax, Online hunt, E-mail networking, social spots, Search machines, Teleconferencing, Cellular phone, Voice correspondence. The role of ICT is pivotal in the advancement of academic libraries.
ANÁLISE DE PERFORMANCE DE TURBINAS EÓLICAS COM DIFUSOR E PÁS CURVADAS
Authors: de Almeida Nobre Jean Carlos , Pereira de Sousa David Lohan , Pinheiro Vaz Jerson Rogério , Vale Silvio Bispo
Published: December 2024

Este trabalho apresenta uma nova análise de performance de turbinas eólicas aumentadas por difusor (DAWT) e pás curvadas (efeito sweep), considerando a influência da eficiência do difusor e do empuxo, na qual é utilizada uma formulação para a velocidade do escoamento na esteira proposta por Vaz & Wood (2018). A teoria do elemento de pá foi estendida para incluir a eficiência do difusor na formulação da velocidade axial que, por sua vez, modifica o empuxo e a potência. É adicionada também uma correção para o empuxo sobre o rotor proposta por Vaz & Wood (2016), em que é utilizada uma equação quadrática para incorporar as perdas no difusor. Foi desenvolvido e implementado um algoritmo para avaliar a performance de turbinas eólicas com difusor e efeito sweep com base na Teoria do Momentum do Elemento de Pá (BEMT). O impacto do difusor é avaliado pelo fator de aumento, a razão entre a eficiência da turbina e o limite de Betz-Joukowsky. A comparação entre o experimento e o algoritmo leva em consideração o mesmo rotor e difusor utilizado por Hoopen (2009), otimizando apenas a pá onde é inserido o efeito sweep. O modelo foi validado em comparação com dados experimentais de Hoopen (2009) e mostra boa concordância com os resultados de potência, torque e empuxo para uma velocidade de 10,0 m/s, o fator de aumento demonstra boa concordância para velocidades de 7,0; 9,0; 10,0 e 11,0 m/s. Os resultados obtidos experimentalmente por Hoopen (2009) são: potência de 531,0 W, torque de 7,10 N.m e coeficiente de empuxo de 0,80. Os resultados obtidos no trabalho atual com a pá reta, são: potência de 532,6 W, torque de 7,10 N.m e coeficiente de empuxo de 0,77. Os rotores otimizados com o efeito sweep de 30° e 40° geraram a maior performance no DAWT. O rotor com efeito sweep de 30° gerou uma potência de 542,3 W, torque de 7,23 N.m e um coeficiente de empuxo de 0,69. O rotor com o efeito sweep de 40° gerou uma potência de 520,37 W, torque de 6,94 N.m e um coeficiente de empuxo de 0,60. O presente trabalho é relevante para o atual estado da arte, pois, o modelo teórico utilizado apresentou resultados satisfatórios, demonstrando a viabilidade do uso de algoritmos para análise de projetos de turbinas eólicas com difusor e efeito sweep.
Portrait of Social Anxiety Among Muslim Adolescent in Malang City
Authors: Najich Muhammad Ali , Rahman Diniy Hidayatur , Atmoko Adi , Kaserero Shubby , Dewanti Septinda Rima
Published: December 2024

Social anxiety is common among high school students, impacting their development. This study examines students social anxiety prevalence in Malang, Indonesia. Using a quantitative descriptive survey method, data were collected from 346 students through cluster random sampling. A social anxiety scale based on La Grace's theory was employed to explore in which aspect students social anxiety. The survey revealed that beliefs in negative assessments (37%) were the highest, followed by social avoidance of new situations (36%) and general social avoidance (27%). Overall, social anxiety in this group is moderate. This study discuss that embedding Islamic and cultural values to address student’s social anxiety may provide effective support for Guidance and Counseling services. Future research should investigate specific values for interventions and consider longitudinal studies to understand their long-term effects.
Measuring Critical Thinking Skills in Science Learning: Students’ Perception Versus Actual Performance
Authors: Afikah Adilah , Rohaeti Eli , Jumadi Jumadi
Published: December 2024

The success of teaching can be measured by the critical thinking skills of students as demonstrated through their activities and study results. A descriptive quantitative study was conducted using the Student Perception of Critical Thinking Questionnaire (SPCTQ) to determine the perceptions of 82 grade IX secondary school students in Yogyakarta, Indonesia, regarding their critical thinking skills and their actual performance in the learning process using the Critical Thinking Observation Sheet (CTOS). The data was analyzed using correlation test analysis. The findings showed that the SPCTQ score was higher than the CTOS value. However, there was no relationship between students' perceptions of their critical thinking skills and learning performance. Although students believed their critical thinking skills were good, they could have performed better in the learning process. This highlights that students' critical thinking skills cannot be maximized solely based on self-confidence, beliefs, and student motivation in learning. Instead, it is important to maintain and shape students' perceptions of their critical thinking skills to suit the learning process.
Web Programming and Multi-Tier Architecture of Web Applications
Authors: Varga Matija
Published: December 2024

The research paper investigates multi-tiered web application architecture and layers of web application architectures based on relevant literature using the scientific method of content analysis. Based on the results of the research (survey, where the scientific method of surveying based on a sample of 42 respondents), was used information was obtained: (1) whether the respondents had heard of tools and technologies that serve as help in programming and testing, such as: JUnita, Apache JMeter, Mockita, (2) whether the respondents used tools and technologies that serve as help in programming and testing such as: JUnita, Apache JMeter and Mockite, (3) which of the above tools are the best in the opinion of the respondents for help in programming and testing from the above: JUnita, Apache JMeter, Mockite, (4) whether the respondents have used BootStrap so far, (5) what according to respondents BootStrap enables, (6) which tools do web developers prefer to use when programming for the purpose of creating websites (applications), (7) what is most important for respondents in order for a website to be evaluated as successfully created and of high quality, (8) did the respondents know that the multi-layer architecture of web applications consists of a presentation layer, a controller layer, a repository layer, a model layer and an auxiliary layer. The research came to the conclusion that the hypothesis "H1" was accepted, while H2 is rejected. In the research, hypothesis H3 was also rejected, while the alternative hypothesis H4 was accepted, based on the chi-square test for all tested cases.
Failure in Constructing the Mathematical Model in Real-World Problems
Authors: Shodikin Ali , Ekawati Rooselyna , Purnomo Heri , Abdullah Abdul Halim
Published: December 2024

Constructing the correct mathematical model is the main key to solving mathematical modeling problems, but students most often fail at this process. Understanding the failure characteristics of constructing a model can be used to correct student errors. This study aims to discuss the characteristics of failures in constructing mathematical models carried out by the students in algebra subject matter. This study used an exploratory descriptive design approach and involves 41 mathematics education students to solve mathematical modeling test questions. The results showed four types of failure characteristics in constructing the model. First, misunderstand type is characterized by disability in capturing important facts from the problem and compiling a model only procedurally. Second, misconnection type is marked by incompetence in making connections between important facts. Third, missspeculation type is noted by the incapacity in making speculations about important facts. Fourth, misslogic type is signed by the inability to use logical facts. Therefore, lecturers or teachers must be more careful to improve the teaching process to be more comprehensive and carry out appropriate scaffolding to overcome the students’ difficulties in solving mathematical modeling problems, especially in constructing mathematical models. The appearance of each error indicates the need for certain repairs. Error correction should be handled based on the characteristics that arise.