bluuebunny/crossref_metadata_2025 huggingface dataset:
Impact of Internal Oxidation and Quenching Path on Fatigue of Powertrain Components
Authors: Stormvinter A. , Kristoffersen H. , Troell E. , Senaneuch J. , Haglund S.
Published: April 2024

Atmospheric case hardening of powertrain components may cause internal oxidation and thus reduce hardenability at the surface zone. This may affect the fatigue strength, which restricts the maximum cyclic load on steel components and hence is a major impediment for powertrain development and design. Here we have investigated the effect of furnace gas atmosphere composition and quenching path on fatigue properties of powertrain components. The results show that the detrimental effect of internal oxidation on fatigue may be compensated for by altering of the furnace atmosphere. Moreover, it is shown that the quenching path below the martensite start temperature also has an impact on the fatigue properties. These experiments were done in a full-scale industrial furnace on steel bars in 16MnCr5 and 20NiMo9-7F.
Torsional Fatigue Performance of Induction Hardened 1045 and 10V45 Steels
Authors: Rothleutner Lee , Cryderman Robert , Van Tyne Chester J. , Burke Jody
Published: April 2024

Microalloying of medium carbon bar steels is a common practice for a number of traditional components; however, use of vanadium microalloyed steels is expanding into applications beyond their original designed use as controlled cooled forged and hot rolled products and into heat treated components. As a result, there is uncertainty regarding the influence of vanadium on the properties of heat treated components, specifically the effect of rapid heat treating such as induction hardening. In the current study, the torsional fatigue behavior of hot rolled and scan induction hardened 1045 and 10V45 bars are examined and evaluated at effective case depths of 25, 32, and 44% of the radius. Torsional fatigue tests were conducted at a stress ratio of 0.1 and shear stress amplitudes of 550, 600, and 650 MPa. Cycles to failure are compared to an empirical model, which accounts for case depth as well as carbon content.
Internal Nitriding of Fe-Cr-Mo Alloys— Precipitation of Mixed Nitrides and Role of the Cr/Mo-Ratio
Authors: Steiner Tobias , Meka Sai Ramudu , Mittemeijer Eric J. , Waldenmaier Thomas
Published: April 2024

Controlled gaseous nitriding of ternary Fe-Cr-Mo alloys leads to the development of ternary, mixed nitrides in the ferrite matrix, which show complex chemical, structural, and morphological transformations as a function of nitriding time: initially continuous precipitation of fine, coherent, cubic, NaCl-type (Cr,Mo)Nx nitride platelets develop, which later transform to a novel, hexagonal CrMoN2 nitride by a discontinuous precipitation reaction. Some relatively coarse cubic nitrides also occur in the ferrite lamellae. The Fe-Cr-Mo alloys with varying Cr/Mo ratio, but all containing a total alloying element (Cr+Mo) content of 2 at.%, showed similar kinetics of continuous precipitation of cubic (Cr,Mo)Nx nitride. The kinetics of the discontinuous precipitation reaction is faster for the alloys with lower Cr/Mo ratio.
Microstructural Evaluation of Salt Nitrocarburizing as a Function of Time
Authors: Juarez-Islas Julio Alberto , Mendez Mario Fabian
Published: April 2024

A study was conducted on a set of H13 steels to enhance their performance as matrices and pins. The steels were austenitized in a high-pressure vacuum furnace at 1015 °C for 180 minutes, followed by nitrogen quenching in a high vacuum (2 bar). Two tempering treatments were applied: one at 540 °C and another at 580 °C, each for 180 minutes, with subsequent nitrogen cooling to room temperature. The nitrocarburizing process was carried out in a liquid bath salt furnace at 580 °C for varying durations of 45, 60, 90, 120, 150, and 180 minutes to assess the impact of treatment time on the quality of the nitrocarburizing layer. Post quenching and tempering, the steels exhibited hardness values ranging from 550 to 570 HV. After nitrocarburizing, the surface hardness increased to between 740 and 810 HV, with a nitrocarburizing layer thickness of less than 14 μm. The microstructural evolution of the compound layer was analyzed using scanning electron microscopy and X-ray diffraction. The characterization revealed a continuous nitrocarburizing ε-Fe2–3(C,N) layer. Specimens treated for 45 to 60 minutes demonstrated superior wear performance compared to those treated for 90 to 180 minutes.
Minimizing Alpha Case during Vacuum Furnace Heat Treating
Authors: Jordan Donald
Published: April 2024

Titanium use in aerospace and medical applications continues to grow. Alpha case formation is a diffusion reaction that occurs at the surface of titanium when processing at elevated temperature in atmospheres containing oxygen, nitrogen, and/or carbon, with oxygen being the prominent element associated with alpha case. Oxygen is solution strengthening at low concentrations, but greatly decreases ductility and forms alpha case at higher concentrations. Thus, alpha case is brittle and has a detrimental effect on part performance and longevity. Higher temperatures increase alpha case depth. Temperatures less than 550°C (1022°F) limit oxygen mobility and keep case depth from increasing. Above 480°C (896°F), air or water vapor will start to produce alpha case.
Modeling and Optimization of Metal Induction Heating before Hot Forming and Heat Treatment
Authors: Pleshivtseva Yuliya
Published: April 2024

The paper considers a process of induction heating of metallic billets prior to hot forming and heat treatment. The main goal of the presented research is a development of novel subject-oriented computer modeling strategy to optimize various induction heating operations using real-life quality criteria. Intricacies of interrelated nature of electromagnetic, temperature and thermal stresses fields during induction heating of metallic billets will be discussed. The model has an interface adapted to optimization procedures. Optimization of temperature patterns is solved using unique alternative optimization method. Computational results for optimal heating of steel cylindrical billets are shown as examples of practical applications of this modeling technology.
Effect of Heating Rate on the Microstructure and Fatigue Properties of 2524 Aluminum Alloy
Authors: Tang Cong , Yia Danqing , Wanga Bin , Liua Huiqun , Shena Fanghua , Tiana Zhe
Published: April 2024

The 2524 aluminum alloy was cold rolled to 70% reduction and then annealed at 500? for 0.5h in an air furnace with a heating rate of 5?/min and in a salt bath with a heating rate of 75?/s, respectively. The effect of heating rate on the microstructure, tensile properties and fatigue crack growth (FCG) rate of the alloy was investigated. The microstructure and mechanical properties of the alloy were studied by means of transmission electron microscopy (TEM), scanning electron microscopy (SEM), optical microscopy (OM), tensile and FCG rate tests. In the case of slow heating the alloy exhibited a coarse elongated grain structure (~75μm), while a fine equiaxed grain structure (~13μm) was obtained in the case of rapid heating. The sheet annealed with rapid heating has slightly higher tensile strength and yield strength, but a slightly lower elongation than the sheet annealed with slow heating. The FCG rate of the sheet annealed with slow heating is 20% lower than the sheet annealed with rapid heating.
Influence of Boriding Treatment on the Oxidation Resistance of the AISI H13 Tool Steel
Authors: Heck Stenio Cristaldo , Takeya Gustavo Satoru , Casteletti Luiz Carlos , Neto Amadeu Lombardi , Totten George Edward
Published: April 2024

The use of high hardness surface layers can extend the life of components such as molds and dies by increasing their wear resistance. However, corrosion and oxidation resistance are also important to improve the durability of the components, especially for those that work under more demanding environments. In this work, samples of AISI H13 tool steel for hot work were borided by the pack cementation process, producing uniform and high hardness layers (1400-1800 HV). Afterwards the samples were subjected to a quasi-isothermal oxidation testing at 550 °C, the same working temperature of H13 steel in aluminum extrusion dies. Throughout the test, the mass gain of the untreated substrate, used for comparison, was 100%, while the borided sample treated at 900 °C for 2 hours had mass gain of 83% and the sample treated at 1000 °C for 4 hours presented a mass gain of 43%. The oxidation coefficients of the borided samples were similar, indicating similar oxidation kinetics but different from the untreated substrate.
USO DE FUNGOS ENTOMOPATOGÊNICOS PARA O CONTROLE BIOLÓGICO DE CARRAPATOS EM BOVINOS
Authors: Vilela Rafaela Cristina de Oliveira , Vieira Vanessa Amaro
Published: April 2024

O carrapato Rhipicephalus (Boophilus) microplus é um ectoparasita que representa grandes perdas na bovinocultura brasileira. Esse trabalho objetiva o uso dos fungos entomopatogênicos como forma de controle biológico do carrapato bovino, com ênfase em resultados pesquisados, avaliando-se a possibilidade do uso sustentável alternativo aos métodos atuais. Adotou-se a metodologia de revisão de literatura, descritiva e exploratória sobre o combate do carrapato R. microplus, seu ciclo de vida e os métodos de controles químicos e biológicos. O uso de fungos como controle biológico de carrapatos em bovinos tem sido uma estratégia sustentável aos tradicionais quimioterápicos acaricidas. Aumenta o lucro do agricultor em independência do uso de controle químico, reduzindo os problemas de impacto ambiental, custo e surto de resistência. O fungo Metarhizium anisopliae tem sido um dos patógenos mais estudados, porém, ainda com resultados modestos no controle do carrapato no campo.
LIDERANÇA FEMININA E SEUS IMPACTOS NO AMBIENTE CORPORATIVO
Authors: Cristina Minetto de Souza Stefani , Sena Barbosa Vitória , Segnini Rodrigues Lilian
Published: April 2024

Este artigo possui o objetivo de relatar sobre o papel da liderança feminina no ambiente de trabalho. Para isso, analisa sobre a evolução das questões relacionadas a igualdade de gênero; relata sobre a evolução das lideranças femininas no ambiente de trabalho; conceitua o papel da mulher no ambiente de trabalho atualmente. Este estudo é de natureza qualitativa e consiste em uma revisão de literatura, que envolveu a pesquisa de livros, dissertações e artigos científicos em bases de dados como o Google Acadêmico e revistas online. A pesquisa incluiu trabalhos de autores renomados na área de pesquisas de campo, abrangendo uma ampla gama de fontes de informação. A pesquisa revela que as mulheres líderes tendem a adotar um estilo de gestão humano, com foco na comunicação emocional e bem-estar dos funcionários e reafirma a desigualdade de gênero que ainda se faz presente no mercado de trabalho, bem como os desafios enfrentados pelas mulheres em cargos de liderança.
PRÁTICAS DE ACESSIBILIDADE PARA PCD (PESSOAS COM DEFICIÊNCIA) EM SOFTWARE E SISTEMAS WEB
Authors: Proni Willian Fernando , Sichieri Danilo Antônio
Published: April 2024

Muitas pessoas e empresas desenvolvem softwares pensando em layouts e designer cheios de animações, brilhos e interações complexas sem imaginar que alguns indivíduos posam ter dificuldades para compreender tal função ou interação que a página ou aplicativo executou ou executará. Este artigo foi escrito com o objetivo de expor técnicas para orientar e demonstrar os motivos de utilizar um designer mais acessível para todas as pessoas. Focado em auxiliar futuros desenvolvedores e empresas no planejamento de novos softwares e websites ou reestruturar o sistema já existente pensando nas pessoas com deficiência. O artigo foi separado em tópicos, cada um especializado em tipos diferentes de deficiência, contendo exemplos, imagens práticas e métodos que podem ser utilizados para facilitar e auxiliar estes usuários (PcD) a interagirem com o software de forma prática e fácil encontrando o mínimo de dificuldade. Com esse conteúdo, o leitor consegue adquirir conhecimentos tanto em compreender a dificuldade de uma pessoa com deficiência quanto adquirir habilidades para desenvolver sistemas adequados para esse público específico.
ETANOL DE MILHO
Authors: Sampaio Camila , De Assis Douglas Ricardo
Published: April 2024

A constante aquisição de novas tecnologias tem permitido crescimento contínuo da produtividade do setor sucroenergético, projetado por tecnologias como o etanol de segunda geração, auxiliando na ampliação de até 50% na produção de etanol por hectare de cana-de-açúcar. Devido ao recente aumento da flexibilização no mercado de gasolina e o consequente aumento do consumo e do valor do etanol, passou a surgir no Brasil em meados de 2010, diversas plantas industriais convertendo o milho nesse biocombustível. Esse fenômeno é particularmente forte no Centro-Oeste, onde o principal objetivo é agregar valor à toda a cadeia produtiva do cereal, proporcionando uma melhor distribuição de renda dentro do setor onde há elevada disponibilidade do grão, altos custos de utilização e possibilidade por co-produtos. O milho como matéria-prima para a geração do etanol vem se tornando mais relevante, não somente para usinas de álcool que processam apenas este grão, mas também nas usinas de cana-de-açúcar que podem produzir etanol na entressafra desse cultivo. Este artigo tem como objetivo apontar uma visão geral histórica e os impactos econômicos e sociais e a rendibilidade da fabricação de etanol de milho. Como resultado constatou que a estrutura de custos dá alta prioridade à matéria-prima, seguida pelos custos industriais para processos relativamente mais complexos do que o processamento da cana-de-açúcar. Por fim, os resultados mostram que a lucratividade da produção de etanol de milho em usinas integradas de combustível flexível é sensível a mudanças nos preços da matéria-prima e do biocombustível.
TECNOLOGIA DA INFORMAÇÃO
Authors: Dias Robinson Alves , Henrique Del Vechio Gustavo
Published: April 2024

Este artigo examina a revolução tecnológica do século XXI e sua relação com a ética da tecnologia da informação e o futuro da biotecnologia. Tem-se, como objetivo, estudar como os conceitos de inteligência artificial, computação em nuvem, Internet das Coisas e realidade virtual são parte cada vez mais integrante do cotidiano das sociedades modernas, remodelando a forma como os seres humanos vivem em sociedade, compreendem o mundo, pensam, se comunicam, trabalham e projetam seu futuro. No entanto, esta revolução tecnológica também levanta questões éticas e sociais, pois o uso indiscriminado da tecnologia pode agravar a desigualdade, aumentar o desemprego e comprometer a privacidade dos dados. Logo, a fim de alcançar o objetivo de estudo proposto, como metodologia, propõe-se uma revisão bibliográfica capaz de avaliar as tecnologias emergentes e o princípio de ética e justiça social. O que se percebe, por este estudo, é que a revolução tecnológica muda a sociedade, enquanto a tecnologia da informação desempenha um papel importante nessas mudanças; no entanto, a compreensão e os princípios éticos são fundamentais para navegar nesse ambiente de mudanças e garantir que as tecnologias modernas sejam aplicadas para o bem comum, privilegiando a forma ética e sustentável de seu uso.
HOMEM VERSUS TECNOLOGIA
Authors: Gonçalves Claudineia Lima , Regattieri Carlos Roberto
Published: April 2024

O presente artigo desenvolvido, aborda o seguinte assunto: o Homem versus Tecnologia. A partir da segunda metade do século XX e agora chegando no tempo atual, pelo grande desenvolvimento de pesquisas referentes à decodificação do mapa genético dos seres humanos, e uso da tecnologia e da manipulação genética, foram surgidas algumas perguntas à humanidade. Dentre os questionamentos eram sobre os limites éticos do envolvimento da natureza humana com a tecnologia, e uma outra que era se poderia existir um futuro pós-humano, em que poderá alterar o modo da natureza humana por meio da biotecnologia e em que pontos seriam encontrados, totalmente pelas limitações naturais, por doenças e pela velhice. No campo científico e tecnológico, seu avanço possibilitou ao homem uma compreensão dos fenômenos naturais e assim, as doenças surgidas em diferentes épocas foram erradicadas, e com certa descoberta, trouxe ao homem uma visão nova sobre a natureza humana. Contudo, se pelas civilizações foram adquiridas a experiência antiga da inclinação do homem e as virtudes, e na modernidade o progresso das ações desmedidas ao incliná-las. O objetivo deste artigo tratará do Homem versus Tecnologia, em um amplo conteúdo que busca apresentar os mais derivados conceitos e temas para um melhor aprofundamento sobre o título proposto, abrangendo as questões importantes nos dias atuais, no intuito de proporcionar também uma compreensão em observância do que a tecnologia instrui o ser humano a fazer.
APLICAÇÃO DE INTELIGÊNCIA ARTIFICIAL PARA ROBÓTICA INDUSTRIAL
Authors: Rinaldi Neto Osvaldo , Henrique Silva Alves Douglas , Souza dos Santos Jean , Renan Bruno Diego
Published: April 2024

O objetivo deste trabalho é analisar a aplicação da inteligência artificial para robóticaindustrial através de uma pesquisa exploratória e qualitativa. Realizou-se uma revisãosistemática da literatura, que envolveu seis etapas. Após a obtenção e análise de dados foramincluídos nesta pesquisa 10 artigos científicos acerca do tema. A inteligência artificial (IA)está em nosso entorno, em carros que pilotam sozinhos, drones, assistentes virtuais esoftwares de tradução. A IA fez progressos impressionantes, impulsionada pelo aumentoexponencial da capacidade de processamento e pela disponibilidade de grandes quantidadesde dados, desde softwares usados para descobrir novos medicamentos até algoritmos quepreveem nossos interesses culturais. A inteligência artificial e a tecnologia robótica têm acapacidade de remodelar as empresas e alterar drasticamente a estrutura das organizações.
LIDERANÇA NEGRA NAS ORGANIZAÇÕES
Authors: Da Silva Rodrigues Samara , De Oliveira Silva Daniel , Segnini Rodrigues Lilian
Published: April 2024

As pessoas negras enfrentam muitos desafios na sociedade e no mercado de trabalho, dentre eles à ascensão nas carreiras. Dois principais motivos que impossibilitam as pessoas negras de ocuparem cargos de liderança são o racismo estrutural e o pacto da branquitude. O objetivo deste artigo é analisar a representação da liderança negra nas organizações, investigando as percepções e desafios enfrentados por pessoas negras enquanto líderes, ou para ocupar posições de liderança. Para isso, foi aplicado um questionário destinado às pessoas negras, pretas ou pardas, com questões fechadas e abertas. Os resultados revelaram a existência de barreiras e preconceitos que dificultam a ascensão dos líderes negros, bem como a falta de representatividade em cargos de destaque. Conclui-se que é fundamental promover a diversidade e a inclusão nas organizações, criando oportunidades equitativas para os líderes negros.
FITONEMATOIDES DE IMPORTÂNCIA PARA A CULTURA DA CANA-DE-AÇÚCAR NO BRASIL
Authors: Rogério de Carvalho Tiago , Alexandre Cavichioli Fábio , Dalvan do Nascimento Daniel , Maria Soares Nathalia
Published: April 2024

A cana-de-açúcar é de grande importância para a produção de açúcar e etanol, desempenhando um papel econômico crucial em muitos países, incluindo o Brasil. No entanto, os nematoides representam uma ameaça significativa para a cultura, causando perdas substanciais de rendimento e qualidade. Esse trabalho tem como objetivo apresentar os principais nematoides que afetam a cultura da cana-de-açúcar, como o Meloidogyne spp. e Pratylenchus spp., examinando seus ciclos de vida, sintomas visíveis de infestação e os danos causados às plantas. Também é apresentado as estratégias de manejo atualmente empregadas para controlar esses nematoides, incluindo a rotação de culturas, a utilização de variedades resistentes, a aplicação de nematicidas e a melhoria das práticas de manejo do solo. Com isso, pode-se concluir que os nematoides causam sérios prejuízos econômicos nas áreas comerciais, o reforça a importância da pesquisa e desenvolvimento visando encontrar soluções mais sustentáveis e eficazes para o manejo, tais como a resistência genética das variedades e o uso de bionematicidas.
SAÚDE MENTAL E SUA INFLUENCIA NA PRODUTIVIDADE
Authors: Valencio Vinicius Israel , Daniela
Published: April 2024

Esse artigo mostra a importância da saúde mental dos colaboradores dentro das empresas brasileiras e do mundo. O objetivo destaca que uma produtividade bem desenvolvida e sólida é por consequência dos colaboradores bem amparados, tendo sua saúde preservada e cuidada, mostrando que o colaborador em excelente saúde metal é essencial para o comprimento de metas e uma boa produtividade. Foram levados e apresentados modelos de programas, benefícios e, contudo, evidenciado que a importância na função dos gestores é a preservação da saúde mental dos seus colaboradores. Uma boa gestão voltada aos trabalhadores é essencial para que uma empresa crie formas e jeitos de atingir suas metas. Foi mostrado que doenças psicológicas aumentaram fortemente nos últimos anos, atingindo diretamente muitos trabalhadores e empresas, causado muita discussão em várias organizações no mundo. Pesquisas para resolução a fim de que possa ter entendimentos necessários e conseguir obter tratamentos que possam sanar essas doenças. Com tudo, ter uma visão ampla sobre esse assunto a fim de resolver a falta de produtividade é um caminho certo.
PRODUÇÃO E COMERCIALIZAÇÃO DO AÇÚCAR NO ESTADO DE SÃO PAULO NOS ANOS DE 2021 E 2022
Authors: Dos Anjos Talia Fernanda Andrade , Bertaci Moacir
Published: April 2024

O objetivo do trabalho é o de estudar e analisar através de dados numéricos a produção e comercialização do açúcar no Estado de São Paulo, considerando as safras de 2020/2021 e 2021/2022. Para tanto, a metodologia escolhida foi a revisão de literatura que permitiu afirmar que o Estado de São Paulo é o maior produtor e comercializador de açúcar no país, pelo fato de deter 50% da área de plantio da cana-de-açúcar, o maior número de indústrias e a maior comercializadora e exportadora do produto e seus derivados, a Copersucar. No período analisado houve redução de 17,9% na produção do açúcar pela falta da principal matéria-prima, a cana-de-açúcar que foi destinada a produção do etanol devido ao mercado mais favorável, ao mesmo tempo que cresceu em 5% as exportações do açúcar e seus derivados.
Жіночі характери у прозі Ганни Барвінок: система духовних цінностей
Authors: Ткаченко Вікторія
Published: April 2024

In contemporary literary studies, the problems of studying the typology of characters are becoming more and more relevant. These characters demonstrate national priorities in mentality, habits and beliefs that have been inherent in the Ukrainian nation for centuries, transforming into original examples of integrity and the ability to resist external and internal circumstances. They serve as a guideline for Ukrainians who find themselves in difficult life situations today and are looking for a way out.The creativity of Hanna Barvinok is an interesting example for analyzing and understanding of the typological picture of characterology in Ukrainian women’s prose of the second half of the 19th and early 20th centuries. The writer started the theme of a woman with a strong moral core in literature. The author demonstrates her mastery of characterization by offering a variety of situations in which her heroines find themselves: from the problems of ordinary everyday life in a respectful family, to scenes where a woman finds herself the victim of a tyrant husband, a woman as a single mother (pokrytka), a lonely woman experiencing emotional drama, to a woman as an artist, and a woman as a fighter who, contrary to social norms, achieves recognition due to her determination and active vitality. Hanna Barvinok’s woman does not remain inert, her character and actions are determined by the logic of the «philosophy of the heart», which was widespread in the philosophical and literary thought of this era. It originates from the Bible, the works of Hryhorii Skovoroda, Panteleimon Kulish, and Hryhorii Kvitka-Osnovianenko. The idea of victory is heard where there is harmony, love, and respect, where God is. Christian morality and humility become decisive for the actions of the heroines who find themselves in a crisis situation.The problem of studying the Ukrainian mentality, the Ukrainian soul, has become widespread in the works of philosophers, psychologists, and cultural scientists who find explanations for specific actions of people in different historical epochs. The works of Viktoriia Khramova, Oksana Kis, and Iryna Kryvonos contributed to a better understanding of the actions and characters of the heroines in Hanna Barvinok’s prose.
Kustos kao umjetnik i umjetnik kao kustos: komparacija dvaju koncepata na primjerima iz hrvatske umjetnosti
Authors: Kalčić Silva
Published: April 2024

Neka su od temeljnih pitanja koja otvaramo ovim tekstom ona o ulozi kustosa i umjetnika u sustavu suvremene umjetnosti na početku njezine polustoljetne povijesti i u najnovije doba, kao i o sličnostima i razlikama između kustoskog i umjetničkog rada: kustoskog rada kao institucionalne kritike u slučaju Želimira Koščevića ili umjetničke prakse kao „društvenog inženjeringa” u slučaju izložbe Davida Maljkovića. Prva je „konceptualna izložba”, kao i prvi primjer konceptualne kustoske prakse u domaćem kontekstu, Izložba žena i muškaraca održana u Galeriji Studentskog centra u Zagrebu 1969., čiji je kustos bio Želimir Koščević, ujedno tadašnji voditelj galerije. U praznu „bijelu kocku” galerije publika ulazi i postaje „tijelo” izložbe, pozvana na interakciju, druženje i razgovor. Drugi primjer neokonceptualne izložbe, odnosno fenomena konceptualizacije izložbe i njezina postava, ali i arhitekture izložbenog postava, nalazimo u izložbi S kolekcijom umjetnika Davida Maljkovića u Muzeju moderne i suvremene umjetnosti u Rijeci 2020. Dokidajući normativne načine prezentacije i interpretacije umjetničkih djela, djela iz muzejske kolekcije Maljković izlaže zbijena i iznad motrišta promatrača te tako uistinu izlaže publiku, „kolektiv, a ne kolekciju”. Važni su aspekti teme pitanje značenja izlaganja nekad i sad, kao i nekadašnje i sadašnje društvene i obrazovne uloge javnih izložbenih institucija.
Successful coil embolization of a ruptured pseudoaneurysm of the superior gluteal artery after a percutaneous awake robot-assisted sacroiliac joint fusion: illustrative case
Authors: Morsi Samah , Bartlett Alyssa M , Hardigan Andrew A , Paturu Mounica , Adams Shawn W , DeBaun Malcolm R , Pabon-Ramos Waleska , Abd-El-Barr Muhammad M
Published: April 2024

BACKGROUND

Robot-assisted sacroiliac joint (SIJ) fusion has gained popularity, but it carries the risk of complications such as injury to the superior gluteal artery (SGA). The authors present the case of an awake percutaneous robot-assisted SIJ fusion leading to an SGA pseudoaneurysm.

OBSERVATIONS

An 80-year-old male, who had undergone an awake percutaneous robot-assisted SIJ fusion, experienced postoperative left hip pain and bruising. Subsequent arteriography demonstrated an SGA branch pseudoaneurysm requiring coil embolization.

LESSONS

An SGA injury, although uncommon (1.2% incidence), can arise from percutaneous screw placement, aberrant anatomy, or hardware contact. Thorough preoperative imaging, precise robot-assisted screw insertion, and soft tissue protection are crucial to mitigate risks. Immediate angiography aids in prompt diagnosis and effective intervention. Comprehensive knowledge of anatomical variants is essential for managing complications and optimizing preventative measures in robot-assisted SIJ fusion.
Intraoperative application of indocyanine green and temporary venous occlusion test to assess collateral flow during microvascular decompression for venous-related trigeminal neuralgia: illustrative case
Authors: Fujimoto Kentaro , Akamatsu Yosuke , Nishikawa Yasumasa , Ogasawara Kuniaki
Published: April 2024

BACKGROUND

In microvascular decompression (MVD) for vein-related trigeminal neuralgia (TN), determining whether transection of the offending vein is safe can be challenging. Here, the authors present a case of vein-related TN successfully treated by sacrificing the offending vein on the basis of findings from indocyanine green (ICG) video angiography and a temporary venous occlusion test to assess the collateral flow of the offending vessel.

OBSERVATIONS

A 43-year-old man presented with TN, which had failed to respond to previous medical therapy. Gadolinium-enhanced magnetic resonance imaging (MRI) revealed that the transverse or superior petrosal vein was the offending vein. The patient underwent MVD. Because the transposition of the offending vein was anatomically challenging, a temporary vein occlusion test was performed using ICG video angiography. During and after temporary occlusion, bidirectional flow in the offending vein was observed, suggesting collateral flow even after vein occlusion. On the basis of these findings, the offending vein was transected, resulting in relief from pain without any complications. Postoperative MRI revealed no new lesions in the brainstem or the cerebellar hemisphere. The patient has been free from neuralgia for 6 months.

LESSONS

The temporary vein occlusion test under ICG video angiography was useful for evaluating collateral flow in the offending vein in TN.
Inserting a Maximum-Mass Spacecraft into a Target Orbit Using a Limited-Thrust Engine with Releasing the Separable Part of Its Launch Vehicle into the Earth’s Atmosphere
Authors:   Moscow State University, Moscow, Russia, Grigoriev I. S. , Proskuryakov A. I. ,   Moscow State University, Baku Branch, Baku, Azerbaijan
Published: April 2024

—Space debris is an urgent problem of our time. This paper considers the idea of reducing near-Earth space debris by releasing the spent additional fuel tank (AFT) and the booster’s central block (CB) into the Earth’s atmosphere. The spacecraft transfer from a reference circular orbit of an artificial Earth satellite to a target elliptical orbit is optimized. The transition maneuvers are carried out using a booster with a high limited-thrust engine and the AFT. The second zonal harmonic of the Earth’s gravitational field is taken into account. The optimal control problem is solved based on Pontryagin’s maximum principle. Bulky derivatives are calculated using a specially developed numerical-analytical differentiation technique. The Pontryagin extremals obtained below are the next step in implementing the problem hierarchy methodology.
Output Stabilization of Lurie-Type Nonlinear Systems in a Given Set
Authors:   Institute for Problems in Mechanical Engineering, Russian Academy of Sciences, St. Petersburg, Russia, Nguyen B.H. ,   ITMO University, St. Petersburg, Russia
Published: April 2024

This paper considers the problem of stabilizing the output variables of a Lurie-type nonlinear system in a given set at any time instant. A special output transformation is used to reduce the original constrained problem to that of analyzing the input-to-state stability of a new extended system without constraints. For this system, nonlinear control laws are obtained using the technique of linear matrix inequalities. Examples are given to illustrate the effectiveness of the method proposed and confirm the theoretical conclusions.
Convex Isoquants in Dea Models with Selective Convexity
Authors:   Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia, Afanasiev A. P. ,   RUDN University, Moscow, Russia, Krivonozhko V. E. ,   National University of Science and Technology “MISIS”, Moscow, Russia,   Federal Research Center “Computer Science and Control”, Russian Academy of Sciences, Moscow, Russia, Lychev A. V. ,   National University of Science and Technology “MISIS”, Moscow, Russia, Sukhoroslov O. V. ,   Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia
Published: April 2024

Models with selective convexity are an important class of data envelopment analysis (DEA) models. This type of model allows managers to consider variables such as ratios, averages, percentages, etc. The paper proposes algorithms for constructing input and output isoquants using volume variables in models with selective convexity. These algorithms help investigate the relationship between any volume variables in the model. Computational experiments confirm the reliability and efficiency of the proposed methods.
A Study of the Relationship between Children Providing Organizational and Financial Housekeeping to Parents: Moderating Effects of Asset
Authors:   Korea Gerontological Society, Min Insik , Hong Kyung-Zoon , Jeon Yeji
Published: April 2024

This study aims to elucidate the influence of sharing organizational housekeeping provided by adult children to their parents on sharing financial housekeeping, and to examine how this relationship theoretically and empirically varies with parental assets. Financial housekeeping sharing refers to the partial or complete use of household income by members together, while organizational housekeeping sharing can be defined as sharing food, having meals together, and sharing living spaces. To derive hypotheses, this study developed theoretical models on financial and organizational housekeeping sharing and their relationship with maximizing utility in households with children. Analysis was conducted using data from the 7th (2018) and 8th (2020) waves of the Korean Longitudinal Study of Aging. The main findings of this study are as follows. First, as assets increase, sharing financial housekeeping decreases. Second, when organizational housekeeping support reaches a certain level, an increase in such share leads to a decrease in sharing financial housekeeping. Third, higher parental assets result in a diminishing negative influence of amount of sharing organizational housekeeping on that of sharing financial housekeeping. The analysis results suggest that as adult children provide more non-monetary resources to parents, the amount of financial resources they provide decreases. However, when parents have substantial assets, there seems to be little substitution effect between organizational housekeeping sharing and financial househousekeeping sharing. Based on the empirical analysis results, this study suggests the need to expand the criteria for recognizing parental support in income redistribution policies to include cases where households, despite not cohabiting, share financial and organizational housekeeping and jointly manage their livelihoods.
Preliminary Validation of Literacy-free Conceptualization Test Using Korean Proverb
Authors:   Korea Gerontological Society, Lee Han-Kyeong , Chey Jeanyung
Published: April 2024

In this study, we developed a proverb test as a measure for assessing higher-order cognitive functions in Korean older adults and explored its psychometric properties. Specifically, we aimed to investigate the applicability of the proverb test as a measure for conceptualization ability within the context of predominantly low-educated elderly population in South Korea. Twenty items were selected, taking into consideration familiarity, abstract thinking requirement, and item adequacy. The test included both open-ended and closed questions to ensure an applicability of the test among low-educated older adults. The results indicated satisfactory internal consistency for both versions of the test. Furthermore, the test demonstrated a high correlation with measures assessing higher-order thinking while exhibiting a relatively lower correlation with measures for memory and attention, thus confirming its convergent and discriminant validity. Also, significant associations were observed between the test scores and measure of daily living functions, suggesting that proverb test scores may be useful in predicting overall adaptive functioning. Additionally, literate and illiterate group showed significant differences in proverb test scores. These findings suggest that the proverb test can adequately be applied as a measure of conceptualization ability in the Korean older adults.
Russian University Students’ Volunteering within the Framework of Sustainable Development Goals and Values
Authors: Zinevich O. V. , Melekhina E. A.
Published: April 2024

The article deals with the issue of university students’ volunteering aimed at pursuing the sustainable development goals under conditions of global crisis and transformation of Russian educational policy in terms of renewal of the higher education upbringing function on the basis of traditional values of the Russian civilization. Russia’s activities on achieving sustainable development goals address carrying out infrastructure projects and Green Agenda. Although large-scale state program of volunteering support and development is being executed, volunteering for sustainable development is not given close attention. Ecological and social volunteering prioritized by governmental regulatory documents is not consistent with implementing sustainable development goals. The need to facilitate volunteering development in universities accomplishing the mission of social and economic development of society in partnership with businesses and civil society institutions is underestimated both in research and in practice. Using system and activity approaches, the authors set the goal to describe the present state of students’ ecological and social volunteering as an efficient platform for attaining sustainable development goals and necessitate its further systemic support. It is shown that the concept of sustainable development is not being an ideological orientation of volunteering practices, although students’ competences aimed at promoting common welfare could be more efficiently developed not only at theoretical level but through real volunteering for the good of future generations. In cross-sectoral partnership of universities, businesses and state, ecological and social goals are achieved by means of volunteering under the supervision of the state while Russian businesses, applying the ESG (Environmental, Social, Governance) principles, do not spare their efforts on collaborative development. As for the subjective factor impeding the development of university students’ volunteering the lack of ideological orientation towards sustainable development, which could be based on universal values specified by Russian culture codes
The Concept “Student Experience” from the Point of View of Philosophical Anthropology and Developmental Psychology
Authors: Efimov V. S. , Laptevа A. V.
Published: April 2024

An actual topic in higher education research today is the study of student experiences. It is believed that knowledge of educational settings, the degree of student involvement in educational and extracurricular activities, satisfaction with the quality of courses or practices offered, etc. helps to retain the student population, modernize educational programs, university campus services, etc. The study presents a new concept of student experience, corresponding to the key position of the university as an institution for the development of human and society. Research methods are conceptual analysis and conceptual design.Ideas about the “student experience” and the need to study its components are determined by the models of relations between the university and students. Currently, universities widely use the “instruction-based” and “consumer” models, and new models such as the “co-production” or “transformative learning” model are also being tested.The article examines the “anthropic” model of relations between the university and students, which 1) reflects the civilizational mission of the university; 2) is based on philosophical and anthropological ideas about the formation of an individual person as a “path” on which he/she discovers new realities (“horizons”) of personal and professional existence; 3) sets a new direction for research on student experience.A new concept of student experience is proposed, correlated with the “anthropic” model of relations between the university and students. Significant components of such experience are: “discovering others” who are carriers of a new (for the student) self-determination, thinking, worldview, and way of action; “shift of the horizon” – the discovery of new meanings, objects, transformation of consciousness (changing its schematisms and categories); mastering a new life world; overcoming the existing ways and patterns of thinking and action, personal limitations and building a new self; reflection of one’s path and “assembling oneself” through personal history.This concept of student experience will allow us to build educational practices that are adequate to the needs of active students focused on complex educational experiences – the path of discovery and transformation of consciousness and thinking
Ensuring Fetal Well-being in Oman: Advocating Optimal Fetal Monitoring for Sustainable Maternal and Child Health
Authors: Al Alawi Asma , Al Riyami Nihal , Al-Adawi Samir
Published: April 2024

Regular foetal monitoring during pregnancy is essential to assess the well‐being of the foetus and, where necessary, to take steps to protect the health of the mother and the foetus. We summarise the best practices in foetal monitoring with emphasis on cardiotocography (CTG) and explain how the optimal use of CTG aligns with the subgoal ‘good health and well-being’ (SDG 3) in the 2030 Sustainable Development Goals of the United Nations (SDG). Prioritising child and maternal health in countries in the global south such as Oman is necessary due to relatively high birth rates. Inadequate foetal monitoring during pregnancy, especially during labour and delivery, puts many newborns at avoidable health risks. The home message for the present discourse is that the demographic trend in the global South and its aspiration to achieve the goal of the SDG, the CTG, have the potential to emerge as a critical tool in promoting the well-being of the emerging generation, thus contributing significantly to the overarching objective of the SDG of fostering good health and well-being for all.
Transitioning to Hybrid Assessment: Reflections on Academic Assessment Practices Post-COVID-19
Authors: Mrisse Fatimazahra , Chafiq Nadia , Talbi Mohammed
Published: April 2024

Assessment constitutes a crucial element of any teaching-learning process, and the COVID-19 pandemic has led to a transition to online assessment at the Faculté des Sciences Ben M'Sick (FSBM) in Casablanca, which is has become common practice. However, this transition is not without its challenges, as evidenced by the obstacles faced by students. This article aims to alleviate these challenges by promoting hybrid assessment of equivalent quality to traditional assessment. Our study combines quantitative and qualitative methods, with an online questionnaire applied to 60 FSBM teachers and an experimental study involving 176 students of the Master Instrumentation and Physico-Chemical Methods of Analysis (MIMPA), divided into experimental and control groups. . . We also developed a scenario for hybrid assessment practices and adapted student skills to a taxonomic skills model as part of a hybrid system. The results indicate a strong interest in hybrid assessment among teachers (68.7%), a high success rate among students (95.65%) also that, there is not a significant difference between the means of the two groups which were measured by the Student's T test. These results reinforce the idea that hybrid assessment can effectively replace traditional assessment while promoting student skill development. In conclusion, we strongly recommend the adoption of hybrid assessment in the higher education system to overcome the technological challenges associated with online assessment.
Navigating Uncertainty in Digital Finance Based on DIKWP Model
Authors: Wu Kunguang , Duan Yucong
Published: April 2024

The paper examines the various uncertainties encountered in high-frequency trading (HFT) environments and delves into the multiple challenges faced by HFT firms in navigating the Dodd-Frank Wall Street Reform and Consumer Protection Act (referred to as the "Dodd-Frank Act"), particularly during the initial stages of its enactment. These challenges include the ambiguity surrounding the definition of HFT, the lack of clarity regarding regulatory requirements and boundaries, inconsistencies in enforcement resulting from deviations in understanding the content, and the absence of detailed descriptions of the Act's provisions. These hurdles significantly impact not only the daily operations of HFT firms but also pose higher demands on their long-term strategic planning and risk management. Drawing upon the Data, Information, Knowledge, Wisdom, and Purpose (DIKWP) model, this study employs an innovative analytical framework. Through the comprehensive application of concept space, cognitive space, and semantic space, it provides a systematic methodology for identifying and analyzing the aforementioned issues. This approach not only aids firms in better comprehending and adhering to complex regulatory requirements but also enables them to explore new business opportunities and competitive advantages while ensuring compliance.
Incidence of Mange Infestation in Rabbits
Authors:   Department of Microbiology, College of Veterinary Medicine, University of Mosul, Mosul, Iraq., Khalil Layan Yaseen , Mohammed Nadia Hamid ,   Department of Microbiology, College of Veterinary Medicine, University of Mosul, Mosul, Iraq., Alhayali Nadia Sultan ,   Department of Microbiology, College of Veterinary Medicine, University of Mosul, Mosul, Iraq.
Published: April 2024

Background: Farmers raise rabbits in abundance in Iraq. Scabies infestation is one of the most prevalent diseases in rabbits. The current study investigates the rabbits’ infestation with scabies that cause severe complications such as itchy alopecia, hyperkeratosis, anorexia, self-trauma, and weight loss. In short, the disease has high morbidity and mortality and creates heavy economic losses for farmers. Objectives: This study was designed to detect mange infestation in rabbits using microscopic examination of skin scraping. This study is the first to investigate mange infestation in rabbits in Mosul City, Iraq. Methods: A total of 130 rabbits were examined, and their skin lesions were scraped. Results: Of 130 rabbits, 56(43.1%) were infested with mange, including Sarcoptes scabiei var. cuniculi (n=50, 38.5%), Psoroptes cuniculi (n=32, 25%), Notoedres cati var. cuniculi (n=26, 20%), Demodex cuniculi (n=12, 9%), and Cheyletiella spp. (n=4, 3%), with the high infestation rate for S. scabiei var. cuniculi and the lowest rate for Cheyletiella spp. The significant lesions were hyperkeratosis followed by alopecia, then pruritus on many body areas (head, ears, abdomen, back, legs, tail, and perineal area). The highest infestation rate was found on the abdomen and back, while the lowest was on the tail and perineal area. There are significant differences according to age, while no significant differences between the males and females and among three types of infestation (single, double, and mixed). Conclusion: The rabbits were infested with several species with different percentages. There was no significant difference in infestation rates between males and females, although there was a difference between younger and older animals. Lastly, a significant difference was clear among the three types of infestation, and the double one was the dominant infestation rate with 50%.