bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimized monomer-based synthesis of poly-N-amino peptides
Authors: Anwar Avraz , Del Valle Juan
Published: February 2025

We report an optimized protocol for the solid-phase synthesis of backbone-N-aminated peptides. Electrophilic N-amination of amino acid zwitterions provides crude -hydrazino acids that can be used directly in SPPS. In situ formation of Fmoc-protected amino acid chlorides with Ghosez’s reagent enables base-free couplings to -hydrazino acids on an automated system. TFA-free cleavage and global deprotection affords poly-N-amino peptides in high crude purity and in a fraction of the time required by previously reported methods.
Dearomative C2–Borylation of Indoles
Authors: Begum Ayesha , Akram Manjur Oyasim , Martin Caleb
Published: February 2025

The dearomative borylation of indoles is challenging and typically requires transition metal catalysts, strong bases, or harsh conditions. We report the metal- and base-free C2-borylation of indoles using bis(1-methyl-ortho-carboranyl)borane as an electrophilic borylating reagent to generate borylated indolines under mild conditions.
Surface charge overrides protein corona formation in determining the cytotoxicity, cellular uptake, and biodistribution of silver nanoparticles
Authors: Barbalinardo Marianna , Chiarini Francesca , Teti Gabriella , Paganelli Francesca , Mercadelli Elisa , Bartoletti Andrea , Migliori Andrea , Piazzi Manuela , Bertacchini Jessika , Sena Paola , Sanson Alessandra , Falconi Mirella , Palumbo Carla , Cavallini Massimiliano , Gentili Denis
Published: February 2025

Silver nanoparticles (AgNPs) hold great promise in biomedical applications due to their unique properties and potential for specific tissue targeting. However, the clinical translation of nanoparticle-based therapeutics remains challenging, primarily due to an incomplete understanding of how nanoparticle properties influence interactions at the nano-bio interface, as well as the role of surface-adsorbed proteins (i.e. protein corona) in modulating nanoparticle-cell interactions. This study demonstrates that surface charge has a greater influence than protein corona formation in determining the cytotoxicity, cellular uptake, and biodistribution of AgNPs. Using negatively and positively charged AgNPs, we show that while protein corona formation is essential for ensuring nanoparticle availability for cellular interactions, the adsorption of biomolecules is non-specific and independent of surface charge. Conversely, surface charge significantly influences the interactions of AgNPs with cells. Positively charged nanoparticles exhibit enhanced cellular uptake, preferential accumulation in lysosomes, and pronounced mitochondrial damage compared to their negatively charged counterparts, resulting in greater cytotoxic effects. This effect is particularly evident in human breast cancer cells, where negatively charged nanoparticles show minimal uptake and cytotoxicity. These findings demonstrate that surface charge is the primary factor governing nanoparticle-cell interactions, rather than protein corona formation. Nonetheless, the protein corona plays a critical role in stabilizing nanoparticles within physiological environments.
Photoluminescent rare-earth qubits embedded in a metal−organic framework as candidates for optical quantum memories
Authors: Du Xiya , Sun Lei
Published: February 2025

Optical quantum memories enable long-distance distribution of quantum information, which is critical for establishing global quantum internet. Rear-earth qubits are promising candidates for optical quantum memories because they can provide spin-optical interfaces with excellent spin coherence and optical properties. When doped into inorganic solids, they display relatively long excited-state lifetimes and in turn low storage efficiencies, which are difficult to optimize via material design. Metal−organic frameworks (MOFs) allow fine tuning of spin coherence and excited-state lifetimes through rational design of coordination environments, thereby offer alternative solid-state platforms to host rare-earth qubits. By incorporating Nd3+ and Yb3+ into an oxalate-based MOF, we develop frameworks that exhibit spin decoherence time exceeding 5 μs at 3.4 K, near-infrared and/or telecommunication-band photoluminescence, and excited-state lifetimes up to 150 μs. These materials hold the promise for optical quantum memories with long storage times and high storage efficiencies. Spin dynamic analysis reveals design principles to further improve coherence, which would promote the development of rare-earth MOFs for quantum information science.
A comprehensive review of the siddha herbo-mineral formulation: vaazhai pazha jayaneer (VPJ)
Authors: Pazhani Shanmugapriyan , Ramasamy Suresh
Published: February 2025

Background: Siddha medicine, a traditional system of healing, is acclaimed for its unique therapeutic formulations that incorporate minerals, metallic preparations, and medicinal plants. Vaazhai Pazha Jayaneer (VPJ), a herbo-mineral formulation, is prepared using Rasathaali Vaazhai Pazham (Musa acuminata colla), Karchunnaambu (limestone), and the ashes of dried banana bark. VPJ is traditionally used to treat urinary tract infections and as a base for high-potency Siddha medicines. Objective: To validate the traditional claims regarding VPJ by exploring its composition, traditional applications, and pharmacological properties through scientific analysis. Materials and Methods: The formulation was selected from the Siddha literature Anuboga Vaithiya Navaneetham. Raw materials were procured and authenticated by experts. VPJ was prepared using standard methods, and the pharmacological activities of its ingredients were documented. Results: The ingredients of VPJ exhibit diverse therapeutic properties, including anti-diabetic, antioxidant, anti-ulcer, anti-hypertensive, anti-inflammatory, and antimicrobial activities. These pharmacological actions support its traditional uses in Siddha medicine. Conclusion: VPJ, as a herbo-mineral formulation, holds significant therapeutic potential. Scientific validation reinforces its efficacy, encouraging further preclinical and clinical studies to explore its full medicinal applications.
"The sky over Kharkiv": on the political and imagological functions of translation
Authors: Ivanytska Maria
Published: February 2025

The aim of the research is to highlight two specific functions of translation, namely political and imagological, based on Ukrainian-German translation over the past three years. The study is relevant because of the need to demonstrate the importance of translation in the political arena, primarily in creating an image of Ukraine, its literature and culture abroad. The object of the study is the impact of translation on the formation of public opinion in Germany about Ukraine and its literature, and the subject of the study is the verbalisation of the imagological function of translation in all its manifestations. The research is based on the book by Serhiy Zhadan “Himmel über Charkiw. Nachrichten vom Überleben im Krieg” (2022) published in Germany, reviews of the book, and public discussions about the author and Ukrainian literature in the German-language press and social media. The main results of the study: the book is characterised as a translation without the original text; the role of translation field agents in preparing the publication and ensuring its reception in the German-speaking literary scene is described; the reviews and the feedback on the publication as well as the frequency of lexemes in them are analysed and the results are visualised in a word cloud; translation approaches are described. Conclusions: The book “Himmel über Charkiw” is a creative intermedial translation product that holds a key role in the socio-political and literary space of Germany thanks to the cooperation of translation field agents with solid linguistic, educational and symbolic capital and the active position of intercultural mediators and promoters of Ukraine: the author, the translators, the publishers and the experts. The book fulfilled an important political and imagological function, offering a multi-vector positive image of Ukrainian society defending its independence and cultural achievements, and appealing to the German-speaking audience to support Ukraine. The discussions around the book increased its media presence and focused on a number of political, aesthetic, cultural and emotional aspects that sensitised the reader to the perception of Ukraine.

This research was supported by a grant from the MSCA4Ukraine project, which is funded by the European Union.
Las entrevistas y el otro en la Historia reciente: el rol de las categorías nativas
Authors: Urteneche Gonzalo
Published: February 2025

ResumenEste artículo analiza el uso de las llamadas categorías nativas en la historiografía del pasado reciente, considerando la influencia de las perspectivas de los actores en el proceso de producción de conocimiento histórico. Examina el desafío que supone equilibrar la distancia crítica del historiador frente a las narrativas de los protagonistas y el uso de sus testimonios como evidencia. Este argumento se desarrolla mediante un análisis comparativo con la antropología, además de estudiar casos específicos en la historiografía argentina sobre el pasado reciente. A través del análisis de obras como Los combatientes. Historia del PRT-ERP de Vera Carnovale y Los montoneros del barrio de Javier Salcedo, se explora cómo las categorías nativas pueden integrarse en el discurso historiográfico. Se concluye que el rol otorgado por el historiador a las perspectivas de los actores determina la posibilidad de construir colectivamente conocimiento sobre el pasado reciente.Palabras claveCategorías nativas, entrevista, testimonio, historiografía argentina, Historia reciente
La novela como fuente para la historia ambiental: El caso de Sub terra en Lota
Authors: Rivera Inostroza Diego
Published: February 2025

ResumenEsta investigación explora cómo las novelas pueden ser fuentes valiosas para los estudios de historia ambiental al reflejar las interacciones entre los humanos y su entorno. Para demostrar esto, el trabajo repasa brevemente la historia de la disciplina, posteriormente justifica la utilidad de la novela como fuente para esta corriente y presenta un contexto histórico de la comuna de Lota (Chile) en la segunda mitad del siglo XIX. Por último, se analiza Sub terra de Baldomero Lillo, destacando cómo la obra representa la vida en las minas de carbón de Lota durante el auge de la compañía minera. El análisis, realizado desde un enfoque interdisciplinario que integra literatura e historia, busca comprender las descripciones del entorno a través de algunos de los ocho cuentos que integran la novela, donde se identifican elementos clave del entorno natural y la relación entre los mineros y este. Además, se examina el concepto de ambiente, entendido como el conjunto de elementos naturales que se manifiestan en la novela a través de los desafíos del trabajo minero y las dinámicas de poder. La investigación concluye que Sub terra ofrece una comprensión enriquecedora sobre las relaciones entre la sociedad humana y ambiente natural, complementando así los estudios historiográficos tradicionales.Palabras claveNovela, Lota, ambiente, Historia ambiental
Tiled decoration of the Apanaevskaya mosque in Kazan: research and restoration
Authors:   Kazan State University of Architecture and Civil Engineering, Persova Svetlana G. , Zubareva Marina M. ,   State Historical, Architectural and Art Museum-Reserve ‘Island-city of Sviyazhsk’
Published: February 2025

The Apanaevskaya Mosque in Kazan is a cultural heritage site of federal significance, one of the most striking examples of Tatar Muslim architecture. The mosque had a rich interior decoration: baroque stucco ceilings, tiled stoves, tiled panels on the walls. During its existence, the building underwent changes; during the Soviet period, the minaret, mihrab, ceilings and interior decoration were lost. But the historical appearance of the mosque was recreated in the process of comprehensive scientific restoration in the 1990s – 2000s.
The authors examine the history of the study of the original tiled decoration of the monument’s interiors and its restoration in the 2000s. Unresolved issues of dating the mosque are touched upon. A comparative analysis is provided and the places of production of tiles used for the decorative decoration of its interiors are determined. The article is based on the results of comprehensive scientific research conducted in the process of preparing scientific and design documentation and restoration of the monument. Previously unpublished materials from the restoration project are presented, including fragments of a tiled panel found during the work, which served as the basis for recreating the decorative decoration of the interiors of the 18th century mosque.
Where are the “rights” in SRHR?
Authors: Okonofua Friday
Published: February 2025

The impetus to write this editorial came from a commentary written by the late Professor Jonathan Mann and Deborah Maine in 19851, the mentors and advocates of this journal, when they asked the question “where is the M in MCH?” That editorial arose from the global tendency at the time to ignore programming and policies on maternal health but rather to concentrate on child health despite the global joint composition of maternal and child health as a critical determinant outcome. The editorial led to the re-ordering of policies, research, and programs to focus on maternal health, especially in low-income countries where the paradigm had been largely exclusive.
In an earlier editorial, this journal had emphasized the importance of embedding “rights” in the global fielding of sexual and reproductive health for more effective and impactful results2. For emphasis, we have decided to pose the question again in this editorial in an effort to draw global attention to a tendency to ignore the original composition of sexual and reproductive health as dependent on the basic principle of human rights.
The questionnaire for the detection of invisible violence against women: Turkish validity and reliability study
Authors: Sönmez Tuğçe , .Apay Serap , Taşgin Adnan
Published: February 2025

This study aims to determine the Turkish validity and reliability of the questionnaire for the detection of invisible violence against women. This methodological study was conducted online with 221 single women with an intimate partner and 277 married women. The scale was confirmed that the 23-item scale had 5 sub-scales. Fit indices were found χ2/sd=2.202, TLI=.900, RMSEA=.074, SRMR =.0571, AGFI=.800, GFI=.850, IFI=.903, CFI=.902 and df= 214 in single women who had an intimate partner. Fit indices were found χ2/sd=2.212, TLI=.901, RMSEA=.066, SRMR=.0582, AGFI=.827, GFI=.864, IFI=.916, CFI=.915 and df=216 in married women. The scale Cronbach’s alpha coefficient was found to be 0.93 for the whole scale. And also the reliability of scale showed that it has excellent Cronbach’s alpha coefficient of 0.84, 0.83, 0.86, 0.74 and 0.72 for the subscales of crisis, utilitarian, coercive, ambivalent and benevolent sexist behaviors respectively. The Turkish version of the questionnaire for the detection of invisible violence against women is a valid and reliable measurement tool for married/single women who have an intimate partner.
Two decades of women’s sexual and reproductive health and rights in Nigeria: Successes, challenges, and opportunities
Authors: Ogedegbe Ajoke E. , Adeagbo Oluwafemi , Yankam Brenda M. , Badru Oluwaseun , Gadanya Muktar A. , Bain Luchuo E.
Published: February 2025

With over 200 million people, 50% of Nigeria's population comprises women of reproductive age (15–49 years), making Sexual Reproductive Health and Rights (SRHR) invaluable in achieving SDGs 3 and 5 on health and well-being and gender equality, respectively. Although Nigeria's reproductive health indices have improved over the past two decades, some critical gaps must be closed. We examined SRHR trends in Nigeria using the Nigerian DHS data sets spanning 2003–2018. Key indicators examined included contraceptive prevalence, skilled assistance during delivery, child marriage, and female genital mutilation prevalence. Reducing maternal mortality rates, closing the quality and availability data gaps, equitably increasing the needed healthcare workforce, and systematically integrating a gender lens into programming remain key priority areas for action. Implementation research through gender transformative approaches is highly relevant in identifying, testing, and scaling effective and culturally appropriate interventions.
Impact of comprehensive nursing on operation time of myomectomy and intraoperative blood loss of pregnant women with co-existing uterine myoma
Authors: Pan Yan , Han Ge
Published: February 2025

We aimed to assess the impact of comprehensive nursing care on the operation time and intraoperative blood loss of pregnant women with uterine myoma. Sixty pregnant patients treated between January 2018 and September 2020 were randomly assigned to a routine nursing group or a comprehensive nursing group (n=30). The comprehensive nursing group experienced significantly reduced operation time, intraoperative blood loss, postoperative ambulation time, and overall duration of hospitalization when compared to those of the control group (P<0.001). Pain levels were also significantly lower in the comprehensive nursing group 12-48 h after operation (P<0.001). Comprehensive nursing led to significant improvements in anxiety and depression scores, with higher nursing satisfaction rates. These findings suggest that comprehensive nursing provides substantial benefits for managing the surgical and mental health outcomes of pregnant women with uterine myoma.
EMPIRICAL RESEARCH ON FINANCIAL LITERACY
Authors: N Anusha , M Srikanth , GK Ramya
Published: February 2025

Financial literacy, the ability to understand and apply financial principles effectively, plays a critical role in personal financial management, economic stability, and overall well-being. This research delves into empirical studies on financial literacy, examining its determinants, impacts, and interventions aimed at improving financial knowledge across different demographics. By synthesizing findings from various studies, this paper highlights the importance of financial literacy in fostering better financial behaviors and reducing economic disparities.
The Impact of Synectics Learning Model Implementation with Mind Mapping Assignments on Reducing Misconceptions and Enhancing Students' Cognitive Learning Outcomes
Authors: Sani Nurul Kami , Darmadi I Wayan , Nurgan  , Kamaluddin
Published: February 2025

Innovative learning models are essential to enhance students' cognitive abilities and address misconceptions in physics learning. This study aims to provide an overview of the influence of implementing the Synectics learning model with mind mapping assignments on the quantity of misconceptions and the cognitive learning outcomes of senior high school students. The research employed a quasi-experimental method using a randomized control group pretest-posttest design. The study was conducted on 11th-grade students at a senior high school in Palu, Central Sulawesi, during the 2023/2024 academic year. A cluster random sampling technique was used to select the sample. Data collection was carried out using pretests and posttests to measure the improvement in cognitive learning outcomes, while posttests were used to assess misconceptions experienced by students during learning with the Synectics model with and without mind mapping assignments. Observation sheets were also used to monitor the implementation of the learning process. The results showed an improvement in cognitive abilities for the experimental class, with an average normalized gain (N-Gain) of 0.63 (high), compared to 0.50 (moderate) for the control class. Based on a significance test at the 0.05 level, the findings revealed that the Synectics learning model with mind mapping assignments significantly outperformed the Synectics model without such assignments. Additionally, descriptive analysis of the misconceptions indicated that the Synectics model with mind mapping assignments resulted in fewer misconceptions compared to the model without mind mapping assignments.
The Effectiveness of Bougainvillea (Bougainvillea spectabilis willd) Extract on Reducing Blood Glucose in Hypercholesterolaemia White Rats
Authors: Hardani Muhammad Fakhrul , Hamzah Baharuddin , Hardani Ririen , Magfirah  , Rahmawati Sitti , Ningsih Purnama
Published: February 2025

Bougainvillea leaves are often used by the public as a treatment by drinking boiled water, but their use as a blood sugar-lowering agent is not supported by scientific data. The purpose of this study was to determine the effect of reducing blood glucose levels and to determine the dose of extract that is effective in in white rats. The plant's herbal extract was prepared using the reflux method with 90% ethanol solvent. This study uses a laboratory experimental method to compare blood glucose levels in white rats before and after administration of herb extract at doses of 100, 200, and 300 mg/kg BW orally using high-fat feed induction and streptozotocin. Blood glucose levels were measured using a glucometer, and mice were declared positive for diabetes with fasting blood sugar levels above 126 mg/dL. The number of test animals used in this study was 30 mice, divided into 6 groups. A randomized block design was used as the research design. The study's findings revealed that administering Bougainville spectabilis willd herb extract at doses of 100, 200, and 300 mg/kg BW can reduce blood glucose in test animals with an effective dose of 200 mg/kg BW
Developing Entrepreneurial Attitude through Soap Making Chemistry Practicum in High School: Need Analysis
Authors: Nurhayatin Titin , Susilo Bambang , Suyanta
Published: February 2025

This study aims to explore how chemistry practicum activities can contribute to the development of students' entrepreneurial attitudes at SMA Negeri 3 Ketapang. This study was conducted at SMA Negeri 3 Ketapang, West Kalimantan, with respondents consisting of 352 students in grades X and XI and 20 chemistry teachers. Data were collected through a 30-item questionnaire based on a five-point Likert scale, which measures six aspects of entrepreneurial attitude, namely self-confidence, task and result orientation, risk-taking, leadership, future orientation, and creativity. The results showed that students recorded the highest score on the risk-taking aspect (74.63%) and the lowest on creativity (56.99%). The teachers showed a similar pattern, with the highest score for the risk-taking aspect (69.00%) and the lowest for the creativity aspect (56.00%). There was little difference in scores between students and teachers, indicating that both groups value entrepreneurial attitudes in education. This study concludes that chemistry practicum enhances students' entrepreneurial attitudes, especially risk-taking and leadership. However, creativity needs more attention to be effectively integrated into the learning process.
Empowerment of Lobster Farmers Based on Renewable Energy in Supporting the Blue Economy in Sawarna Village, Banten Province
Authors: Reztrianti Diajeng , Rahmawantari Dhistianti Mei , Uyun Aep Saepul , Hidayat Irfan , Pratama Muhammad Daffa , Antasti Erico
Published: February 2025

This Community Partnership Program (PKM) was implemented to support the empowerment of a group of lobster farmers in Sawarna Village, who face various challenges in managing their farming business. The problems faced by lobster farmer groups in the village are lack of access to stable energy and limited management knowledge, which has an impact on the sustainability of the lobster farming business. The purpose of this service is to improve the knowledge and skills of lobster farmers in business management and adopt renewable energy technology as a solution to limited energy access. The method used in this activity is the Participatory Rural Appraisal approach, which involves farmers actively through socialisation, training, technology application, mentoring, and continuous program evaluation. The results of this service showed an increase in the ability of partners in business management, digital marketing, and the application of renewable energy technology in the form of solar power systems to support cultivation operations. In addition, there was a significant improvement in the quality of management after the training, with participants showing improved financial, marketing, and operational management. The conclusion of this activity is that the application of renewable energy technology and improved management capacity through training and mentoring can successfully support the sustainability of the lobster farming business in Sawarna Village, thus helping farmers to face the environmental and economic challenges faced in the long term.
ANÁLISE DA INFLUÊNCIA DA PENETRAÇÃO DE TRABALHO E VELOCIDADE DA PEÇA NA POTÊNCIA DE RETIFICAÇÃO DA POLIAMIDA 6
Authors: Martins Jamille Kessia Araújo , Abrão Bruno Souza , Abrão Amanda Souza , Messias Ana Caroline Teixeira , Pereira Mayara Fernanda , Silva Rosemar Batista da
Published: February 2025

O setor industrial busca otimizar processos de manufatura, com foco no controle de parâmetros que impactam o consumo energético. A retificação é relevante nesse contexto por ser um processo que exige mais tempo que outros, como o torneamento e fresamento, e remove pouca quantidade de material. Entre as variáveis que influenciam a taxa de remoção de material, destacam-se a velocidade da peça e a penetração de trabalho, pois afetam tanto o tempo de usinagem quanto a integridade da peça. Este estudo tem como objetivo analisar a influência da penetração de trabalho (a_e) (30 µm e 60 µm) e da velocidade da peça (Vw) (2,7 m/min e 7,5 m/min) na potência de retificação da Poliamida 6 (Tecnil). Foram também avaliados os valores de rugosidade Ra dos componentes usinados para identificar possíveis correlações com a potência. O aumento da penetração de trabalho com Vw de 7,5 m/min elevou a potência em 8,4%, enquanto o aumento da penetração com Vw de 2,7 m/min não gerou alterações significativas. O maior pico de potência (753 W) ocorreu com a combinação a_e= 60 µm e Vw = 7,5 m/min. O aumento da penetração resultou em maior rugosidade Ra e Rz, com elevações de 23% e 26,6%, respectivamente.
ESTUDO DA QUALIDADE SUPERFICIAL NO MICROFRESAMENTO DO AÇO AISI H13 FABRICADO POR MANUFATURA ADITIVA
Authors: Lopes Josenilton dos Santos , Silva Márcio Bacci da , Araújo Carlos José de , Oliveira Marcus Vinicius de , Câmara Pietro Bedule
Published: February 2025

Os produtos fabricados por manufatura aditiva ainda necessitam de processos de pós-processamento, como o microfresamento, para aprimorar sua qualidade superficial. Este estudo visa investigar a rugosidade superficial do aço AISI H13 fabricado por manufatura aditiva após o processo de microfresamento. Para isso, foram utilizadas ferramentas de metal duro revestidas com (Al, Ti)N e 400 µm de diâmetro. Como parâmetros de entrada, foram utilizados penetração de trabalho (ae) de 400 µm, avanço por dente (fz) de 1 µm/dente, profundidade de corte (ap) de 40 µm, velocidade de corte (Vc) de 12,57 m/min e as variáveis de saída analisadas foram os parâmetros de rugosidade Rq, Rku e Rsk e acabamento das superfícies microusinadas via microscópio eletrônico de varredura (MEV). Os resultados mostraram que os valores de rugosidade Rq variaram de 0.0343 ± 0.0013 µm até 0.0901 ± 0.0183 µm. Em relação ao parâmetro de rugosidade Rku, nos últimos canais foram observados valores de Rku maiores que 3, indicando perfis de rugosidade com a presença de picos e vales com formatos agudos e afunilados. Por fim, para os próximos trabalhos, recomenda-se a realização de análise estatísticas como ANOVA e a medição de força de usinagem.
AVALIAÇÃO DA INCERTEZA ASSOCIADA AO LIMITE DE RESISTÊNCIA OBTIDO CONFORME NORMA ASTM E8/E8M (2022)
Authors: Silva Joyce Antunes da , Ferreira Vitor Nakayama de Araújo Pires , Prado Bruno de Oliveira , Presotto Israel Alexandre , Arencibia Rosenda Valdés
Published: February 2025

Este trabalho tem por objetivo avaliar a incerteza associada ao limite de resistência do aço AISI 4340 (28 HRC), via ensaios de tração normatizados ASTM E8/E8M (2022). Para tanto foi aplicado o método Guide to the expression of Uncertainty in Measurement (GUM), que consistiu da identificação das variáveis de entrada, definição do modelo matemático da medição e aplicação da lei de propagação de incertezas. O roteiro de cálculo foi implementado em MATLAB®R2019a com a finalidade de popularizar o cálculo da incerteza associada ao limite de resistência para ensaios de tração. A incerteza expandida associada ao limite de resistência obtido via ensaios de tração para um único CP foi de 8,75 MPa. O limite de resistência resultante do ensaio de tração do aço AISI 4340 para os três CPs é 911,9 ± 4,11 MPa. A incerteza expandida representa 0,4 % do valor médio, portanto, pode ser considerada adequada. O código desenvolvido em MATLAB®R2019a permitiu determinar a incerteza associada ao limite de resistência com exatidão.
TEXTURIZAÇÃO VIA MECT EM AMOSTRAS DE AÇO RÁPIDO
Authors: Monteiro Junior Paulo Lourenço , Ferreira Gabriel Oliveira , Murray Henara Lillian Costa
Published: February 2025

O objetivo deste trabalho é definir parâmetros adequados de texturização eletroquímica sem mascaramento (MECT) para texturizar superfícies de amostras de aço rápido, o qual é um material vastamente utilizado na Indústria Metalmecânica, por exemplo, em cilindros de laminação, em matrizes de estampagem e ferramentas de corte. Assim, foram realizados ensaios de texturização variando-se o tempo de texturização e a tensão elétrica. As medições das dimensões das texturas (área e profundidade) foram realizadas via microscopia óptica e interferometria a laser. Essas dimensões foram utilizadas como critério para definir as melhores condições de texturização. Por fim, os ensaios realizados com 20 V e 45 s apresentaram os melhores resultados.
ANÁLISE DA ANISOTROPIA EM AÇOS AVANÇADOS DE ALTA RESISTÊNCIA: AVALIAÇÃO ATRAVÉS DE ENSAIOS DE TRAÇÃO
Authors: Bonifácio Samuel Davi Vieira , Santos Bruno Felipe Monteiro , Alonso Thaise , Bose Filho Waldek Wladimir , Franco Sinésio Domingues
Published: February 2025

A análise da anisotropia em aços avançados de alta resistência (AHSS, do inglês Advanced High-Strength Steels) refere-se à variações de propriedades mecânicas no aço. Nos aços avançados , essa propriedade pode influenciar o desempenho em componentes que exijam resistência e ductilidade, o que impacta diretamente o desempenho em alta conformabilidade. Este trabalho tem como objetivo avaliar a anisotropia nos aços bifásicos (DP, Dual Phase) e nos aços com transformação induzida por plasticidade (TRIP, Transformation Induced Plasticity). A avaliação será conduzida por meio de ensaios de tração em corpos de prova em três direções (0°, 45° e 90°) em relação ao sentido de laminação, buscando identificar variações nas propriedades mecânicas e relacioná-las à microestrutura de cada aço. Ao final, será feita uma comparação entre os aços DP e TRIP.
PROCESSO DE ANÁLISE ESTÁTICA E DINÂMICA DE JUNTAS PARAFUSADAS COM PRÉ CARGA APLICADA
Authors: Alves Artur Martins , Carvalho Douglas da Silva , Silva Leonardo Rosa Ribeiro da , Silva Vitor Marques
Published: February 2025

A pré-carga de torque em parafusos é crucial para a estabilidade e segurança das conexões parafusadas em diversas indústrias. Ela distribui uniformemente as cargas, resiste à fadiga e previne falhas estruturais. A perda de pré-carga pode ocorrer devido ao assentamento elástico, deformação plástica e relaxamento do material. O uso de ferramentas como o Abaqus ajuda a simular e prevenir essas perdas, garantindo conexões robustas e duradouras.
BALANCEAMENTO DE UM ROTOR UTILIZANDO O MÉTODO DOS COEFICIENTES DE INFLUÊNCIA GENERALIZADOS
Authors: Souza Francisco Alberto de Araújo Apolinário e , Pereira Neto Raimundo Vicente , Cavallini Jr Aldemir Aparecido
Published: February 2025

O desbalanceamento é uma das principais avarias que acometem rotores. Desse modo, este trabalho descreve a implementação do Método dos Coeficientes de Influência Generalizados em um rotor experimental desbalanceado, à rotação de 14 Hz, reduzindo a amplitude (no espectro da frequência) da vibração mensurada em 14,35 vezes.
DESENVOLVIMENTO DE UMA NOVA ESTRUTURA ROBÓTICA PARA REABILITAÇÃO BIMANUAL
Authors: Vasconcelos Gustavo Bruno Oliveira , Gonçalves Rogério Sales
Published: February 2025

A reabilitação do corpo humano é uma área de grande importância e que tem recebido cada vez mais atenção. Com o desenvolvimento de novas tecnologias, especialmente as estruturas robóticas, os tratamentos de reabilitação tornaram-se mais eficazes e personalizados. Este trabalho descreve o desenvolvimento de uma estrutura robótica projetada para reabilitação bimanual de pacientes com sequelas do AVC. A metodologia de desenvolvimento inclui a definição do espaço de trabalho, modelagem matemática, projeto CAD/CAE, fabricação e jogos sérios.
MAPEAMENTO DOS COEFICIENTES DINÂMICOS DE UM SELO PLANO
Authors: Chagas Kaíque César Macedo , Cavallini Jr Aldemir Aparecido , Steffen Jr Valder
Published: February 2025

O estudo sobre o comportamento dos coeficientes dinâmicos de selos é de extrema importância na Dinâmica de Máquinas Rotativas, onde selos mecânicos são incluídos na equação do movimento de uma máquina rotativa através dos seus coeficientes de rigidez e amortecimento. Diversos trabalhos encontrados na literatura utilizam de hipóteses simplificadores em modelos matemáticos de selos mecânicos. Como consequência, a solução numérica do modelo matemático em questão torna-se mais simples e restrita. Uma das principais hipóteses simplificadoras utilizadas é assumir que a posição de equilíbrio do centro do rotor é concêntrica ao selo. Considerar esse tipo de hipótese inviabiliza a análise do comportamento dos coeficientes dinâmicos considerando diferentes posições de equilíbrio do centro do rotor. Nesse sentido, o presente trabalho tem como objetivo realizar o mapeamento coeficientes dinâmicos de um selo plano de acordo com a posição de equilíbrio do centro do rotor, utilizando o Método dos Volumes Finitos para a solução do modelo matemático que não adota hipóteses simplificadoras.
APLICAÇÃO DE METAMODELOS KRIGING PARA DETERMINAÇÃO DOS COEFICIENTES ROTOR-DINÂMICOS DE SELOS ANULARES
Authors: Cabral Leonardo Dias da Silva , Cavallini Junior Aldemir Aparecido
Published: February 2025

Atualmente é observada uma tendência crescente entre os pesquisadores acerca de modelos estatísticos ou de aprendizado de máquina. Tais modelos permitem substituir metodologias de alto custo operacional ou de elevada complexidade. Logo, abordagens como metamodelos ou redes neurais, por exemplo, possibilitam manter a representatividade dos modelos originais, a um custo reduzido. No contexto de máquinas rotativas, as técnicas de determinação dos coeficientes rotor-dinâmicos para mancais e selos se mostram custosas e de complexa implementação. Portanto, a proposta deste trabalho visa a aplicação de metamodelos do tipo Kriging para determinar os coeficientes de rigidez e de amortecimento de selos anulares encontrados em máquinas rotativas. Os modelos foram implementados em linguagem Python e treinados para uma relação de 70 % do conjunto de dados e 30 % para validação. Duas aplicações foram efetuadas, a primeira relacionada à dados do software LABY3 e a segunda para dados de um compressor de injeção. A métrica escolhida para avaliação foi o erro médio quadrático (MSE). Em ambas as aplicações os metamodelos obtiveram resultados satisfatórios, com desvio máximo entre os dados do metamodelo e os originais de 0,06 % e 0,6 %, para cada aplicação, respectivamente.
GPU-ACCELERATED LARGE-EDDY SIMULATIONS
Authors: Souza Francisco José de , Abid Hussain A. , Markesteijn Annabel P. , Lawrence Jack , Karabasov Sergey A.
Published: February 2025

This work presents the results of a Wall-Modeled Large-Eddy Simulation (WMLES) applied to a compressible round jet flow. The computational code utilized is CABARET, which employs a high-resolution scheme and runs on Graphical Processing Units (GPUs) to accelerate calculations. The configuration investigated in this work replicates one of a series of experiments performed at NASA, against which the numerical results are compared. The numerical simulation is performed for a Mach number of 0.5, based on the fully expanded flow at the exit of the nozzle, named SMC000. The numerical mean quantities display very good agreement with experiments. Under-prediction of the Reynolds stress components is observed, most likely because the upstream pipe is not long enough to allow turbulence to fully develop. The mesh resolution of approximately 40 million cells was found to be sufficient for accurate results in both fluid dynamics and flow acoustics. The entire simulation, comprising 1400 convective time units based on the nozzle exit diameter, took less than 24 hours of wall-clock time on a single NVIDIA A100 GPU card, suggesting that the utilization of GPUs might represent a paradigm shift.
OTIMIZAÇÃO DE FORMA PARA MINIMIZAÇÃO DA PERDA DE CARGA
Authors: Peres José Guilherme de Freitas , Souza Francisco José de
Published: February 2025

Este trabalho realizou a otimização de um duto para minimizar a perda de carga. As equações fluidodinâmicas são resolvidas numericamente usando o software ANSYS Fluent e utilizadas como parâmetros de entrada para o método de otimização. O método de otimização adjunto é utilizado devido a sua eficiência computacional. Esse método modifica a malha de forma iterativa em regiões de alta sensibilidade da função objetiva. A geometria obtida reduziu a perda de carga em 81 % comparado à geometria original.
NUMERICAL INVESTIGATION OF FAR-FIELD NOISE IN TRANSONIC JET NOZZLES
Authors: Meira Lucas de Souza , Souza Francisco José de
Published: February 2025

The present work aims to present a practical and feasible methodology for noise prediction in far-field signatures of jet nozzles by means of Computational Fluid Dynamics (CFD) and a Generalized Acoustic Analogy (GAA) technique. We present and validate an in-house code, FastJetNoise, using experiments conducted at Southampton's Doak Laboratory. In order to develop the present analysis, we used a commercial Reynolds-Averaged Navier-Stokes equations (RANS) solver to provide the flow turbulent characteristics. Subsequently, the flow properties were arranged in a structured mesh, computed by the aforementioned code. Specific radial and azimuth coordinates were measured, and their PSD (Power Spectral Density) was compared with experiments. For this study, we simulated and validated a baseline circular smooth nozzle, demonstrating good agreement between the numerical and experimental data.
Administração Contemporânea: Práticas, Desafios e Perspectivas
Authors: Fernandes Allysson Barbosa , Romão Adriano Alves , Rezende Guelly Urzêda de Mello , Fukuoka Danilo Marcos Leme , Ricardo Fabiana Pereira de Aguiar
Published: February 2025

A administração contemporânea se desenvolve em um cenário dinâmico e em constante transformação, no qual desafios e oportunidades emergem de forma acelerada e imprevisível. A complexidade dos mercados, a evolução das tecnologias e a necessidade crescente de inovação exigem dos gestores não apenas conhecimento técnico, mas também uma visão estratégica, sistêmica e adaptativa. Nesse contexto, a administração transcende sua função instrumental e se consolida como um campo do saber que dialoga diretamente com as ciências sociais, refletindo as mudanças e avanços da sociedade.
Esta obra surge como uma contribuição essencial para o pensamento crítico e para a disseminação de novas abordagens na área da gestão. A presente obra reúne reflexões de pesquisadores que exploram temas estruturantes da administração moderna, tais como inovação e sustentabilidade, gestão de conflitos, inteligência emocional no ambiente corporativo, impactos da globalização, e a influência das novas tecnologias na tomada de decisão. Cada capítulo, ancorado em estudos científicos rigorosos, proporciona uma leitura aprofundada e alinhada às demandas contemporâneas das organizações.
Mais do que um compêndio de teorias e práticas, esta obra busca fomentar um debate qualificado sobre os rumos da administração em um mundo globalizado e digitalmente integrado. O convite que fazemos ao leitor é que explore este material com espírito investigativo e olhar crítico, conectando as discussões aqui apresentadas à sua vivência acadêmica e profissional. Seja você um pesquisador, docente, estudante ou profissional da área, esperamos que esta leitura amplie seu repertório analítico, fortaleça sua capacidade de liderança e inspire novas estratégias para enfrentar os desafios da gestão na cena contemporânea.
A administração do futuro se constrói a partir de reflexões consistentes e práticas inovadoras no presente. Que este livro seja uma fonte valiosa de conhecimento e um catalisador de novas perspectivas para sua atuação no campo da gestão.
Investigating The Flapped Horizontal Axial Wind Turbine Experimentally to Improve Power coefficient and Stability
Authors: Qassim Qassim , A.R. Yass Muhammad , Kamil Hasan Ahmed
Published: February 2025

This paper investigates the potential of deploying flaps on wind turbine blades to enhance their efficiency and energy capture capabilities. The FX66-S-196V, FX63-137 S, and SG6043 supercritical airfoils were used and distributed along the blade radius. Flaps, situated 20% along the trailing edge of the blade chord, offer a means of actively controlling aerodynamic forces and optimizing blade performance under varying wind conditions. Through computational fluid dynamics (CFD) simulations and optimization techniques. The aerodynamic effects of flap deployment on wind turbine blades are analyzed. The study explores the impact of flap angle, position, and deployment strategy on key performance metrics such as power coefficient, lift-to-drag ratio, and energy extraction efficiency. Results demonstrate that judiciously deploying flaps can lead to significant improvements in turbine efficiency, with power output enhancements ranging from 2.5% to 4.6%, depending on operating conditions such as wind speed, tip speed ratio, angle of attack, and flap angle setting. Furthermore, sensitivity analysis reveals optimal flap configurations for different wind regimes, highlighting the importance of adaptive control strategies. This research contributes to the growing body of knowledge on active aerodynamic control techniques for wind turbine optimization and underscores the potential of flaps as a viable means of enhancing wind turbine blade efficiency in practical applications.
Eventual consistency vs. strong consistency: Making the right choice in microservices
Authors: Ashwin Chavan
Published: February 2025

This paper discusses one of the most crucial decisions for microservices, which is between eventual consistency and strong consistency. It examines how every model influences the system's efficiency, stability, and usability. Eventual consistency is also good for availability and scalability because it uses asynchronous updates, which is recommended for social sites like Facebook and e-commerce sites like Amazon. However, it brings issues like transient data instabilities and conflicts in managerial schemes. On the other hand, strong consistency guarantees real-time data updates, ideal for companies dealing with critical areas such as finance and healthcare since data must meet set regulatory standards. Still, it causes high latencies and additional expenditures on the infrastructure. In theoretical approaches, namely the CAP and PACELC theorems, this paper explains various aspects of the tradeoffs between consistency, availability, and performance. Analyzing the real-world use cases, including Saga and Outbox patterns, the most important approaches to achieve consistency with the needed freedom in system design can be outlined. In such a context, hybrid models appear as potential strategies that define consistency levels according to data and related operations' sensitivity. Anticipated future work, another trend in algorithmic adaptability and dynamic self-synchronization, contemplates new strategies for the persistence of consistency at the distributed application level. Matching consistency choices with business needs allows organizations to improve system performance, costs, and credibility. This article calls for more comprehensive and long-growth learning, effective testing, and iterative architectural planning while dealing with the intricacies of consistency models in the dynamic setting of microservices architecture, providing artists and developers with a thorough guide in the process.
Nanophotonic electron accelerator: A review of particle accelerator technology
Authors: Shikha Pandey  , Ananya Singh  , Arshad Kamal
Published: February 2025

Particle accelerators are indispensable tools in various industries, spanning a wide range of research fields such as nuclear and particle physics. They are particularly valuable in the medical sector for applications like medical imaging, radiotherapy and tumor treatment. Currently, the largest and most powerful particle accelerator is the Large Hadron Collider (LHC) at CERN, a 27-kilometer-long ring-shaped tunnel that accelerates particles, such as protons, to near-light speeds and collides them. While the LHC represents the pinnacle of accelerator technology, there is significant interest in developing compact particle accelerators that can fit within buildings, laboratories, or even on tabletops. However, even smaller accelerators often occupy several square meters of valuable space and may suffer from performance limitations. Not all applications require massive machines like the LHC, and more compact solutions could fulfill many needs efficiently.

Furthermore, a breakthrough in this field has been achieved by a team of laser physicists from Friedrich-Alexander University Erlangen-Nürnberg (FAU), who successfully demonstrated the first nanophotonic electron accelerator. This nanoscale device has been used to accelerate electrons, achieving a remarkable energy gain. What makes this development truly exciting is the unprecedented compactness of the nanophotonic accelerator - it is so small that it fits on a one-cent coin, making it the smallest particle accelerator currently available. Often referred to as a "particle accelerator on a chip," this technology holds immense potential, including applications in advanced cancer radiation therapies.
Exploring human experience through phenomenological research
Authors: Shikha Tiwari  , Ritu Tripathi  , Aarti Srivastava
Published: February 2025

A phenomenological investigation, according to Creswell (2007) (p. 57), is described as the “life experience of several individuals on a concept or a phenomenon." Transforming individual experiences with a phenomenon to a description of the universal essence is the aim of the phenomenological method (Creswell, 2007, p. 58). This research paper aims to educate the research fraternity on phenomenological research methodology. Phenomenology is one of the most widely utilized qualitative approaches in PhD Thesis and research studies. A study that applies phenomenological research methodology aims to investigate people's perceptions and comprehension of a specific situation. According to Christensen, Johnstone, and Turner (2010), phenomenological research is distinct from other forms of qualitative inquiry in that it aims to comprehend the essence of a phenomenon from the viewpoint of people who have experienced it. To provide diverse perspectives on the topic under investigation, these investigations require a sufficient number of participants (Moustakas, 1994), for the researcher needs to describe the population of interest providing demographic information about the population to be sampled. Sampling is usually purposive or snowball; the sample size is 8-15, depending on the text referenced.

A phenomenological study revolves around the lived experience of a group of people around a particular phenomenon as the main research issue. Its strong methodological and philosophical foundation makes it applicable to practically every subject.