bluuebunny/crossref_metadata_2025 huggingface dataset:
Modelagem 3D para Fins de Resgate, Divulgação e Preservação do Patrimônio Histórico: caso Forte do Raio, Itaguaí-RJ
Authors: Mello Bernardo da Cunha Carvalho de , Fosse Juliana Moulin , Graça Alan José Salomão , Veiga Luís Augusto Koenig
Published: October 2024

O Forte do Raio foi uma fortificação militar edificada no município de Itaguaí-RJ, construída no início do século XIX. Essa fortificação tinha a função de proteger o caminho entre a vila de Itaguaí e a vila de Mangaratiba, o Caminho das Calçadas e a costa litorânea fluminense. As ruínas da edificação só foram descobertas em 2018, em condições precárias. O objetivo deste trabalho foi realizar um modelo cartográfico tridimensional, visando reconstituir o Forte do Raio por meio de documentação histórica e aplicação de técnicas cartográficas como uma ferramenta para a divulgação e preservação do Patrimônio Histórico. A metodologia envolveu levantamento realizado com uso de trena, registro fotográfico in loco no sítio arqueológico, extração de medidas e feições do mapa histórico com o auxílio de feições correspondentes obtidas por dados espaciais recentes, medidas do perfil e da planta topográfica obtidas por meio de software CAD, modelagem paramétrica 3D e texturização do modelo em meio digital. Posteriormente, com o conhecimento das dimensões da estrutura, foi gerado o modelo tridimensional semelhante à estrutura original do Forte do Raio, a fim de proporcionar ao usuário a disponibilidade de uma abordagem imersiva e dinâmica. Por meio dos resultados alcançados, demonstrou-se que é possível transformar uma planta topográfica original, de aproximadamente 200 anos, em um modelo cartográfico tridimensional para uso em ambientes digitais, de Realidade Aumentada e de Realidade Virtual. Desse modo, o trabalho evidenciou que o uso das tecnologias atuais, aliadas à Cartografia Histórica, proporciona novas possibilidades à divulgação e preservação do Patrimônio Histórico.
Panorama da Cartografia Geotécnica do Estado de Mato Grosso
Authors: Oliveira Bruno Rodrigues
Published: October 2024

A elaboração de cartas geotécnicas requer uma abordagem multidisciplinar e abrangente, envolvendo desde o planejamento até a sua atualização. Esta pesquisa analisa os procedimentos metodológicos utilizados na elaboração desses produtos cartográficos no Estado de Mato Grosso com o objetivo de compreender tanto seus benefícios quanto suas limitações e de formular recomendações acerca dos métodos utilizados para a elaboração de futuras cartas geotécnicas no Estado de Mato Grosso. Considerando os quatro produtos elaborados pelo Serviço Geológico do Brasil (SBG) e as cinco cartas elaboradas em convênios com a Universidade Federal de Mato Grosso, observa-se que 95% dos municípios do estado não possuem nenhuma carta geotécnica que subsidie o processo de uso e ocupação do solo. O método de delimitação das unidades geotécnicas, utilizado nas cartas, se apresenta como uma abordagem adequada de definição de unidades geotécnicas preliminares devido à sua fácil aplicação, mas carece de quantificação das propriedades geotécnicas. Recomenda-se padronizar a representação dos símbolos, escalas e legendas utilizados na representação cartográfica, adotando padrões preferencialmente utilizados pelo SGB e documentar de maneira detalhada os métodos de coleta de dados, as análises realizadas e as conclusões obtidas durante o processo de elaboração da carta geotécnica.
Pembelajaran Berdiferensiasi Matematika Untuk Meningkatkan Hasil Belajar Peserta Didik Kelas VII Materi Garis dan Sudut (SMP Negeri Satu Atap-1 Kahayan Kuala Kabupaten Pulang Pisau Provinsi Kalimantan Tengah)
Authors: Riyannie Desi
Published: October 2024

Penelitian ini bertujuan untuk mendeskripsikan aktivitas guru dan peserta didik serta menganalisis hasil belajar dan respon peserta didik pada pembelajaran matematika berdiferensiasi menggunakan model Problem Based Learning (PBL) pada materi garis dan sudut. Penelitian ini dilakukan di Desa Kiapak dengan integrasi pembelajaran luar kelas di SMP Negeri Satu Atap-1 Kahayan Kuala melalui wisata edukasi mangrove "Si Mangki". Metode yang digunakan adalah penelitian tindakan kelas (PTK) yang dilaksanakan dalam dua siklus, masing-masing terdiri dari perencanaan, pelaksanaan, observasi, dan refleksi. Subjek penelitian terdiri dari lima peserta didik yang dipilih secara purposif. Data dikumpulkan melalui observasi, tes hasil belajar, dan angket respon peserta didik. Analisis data dilakukan secara kualitatif untuk observasi dan secara kuantitatif untuk tes hasil belajar dan angket. Hasil penelitian menunjukkan bahwa (1) pemanfaatan hutan mangrove di Desa Kiapak sebagai alternatif pembelajaran luar kelas sangat inovatif; (2) peserta didik menunjukkan peran aktif dan sikap positif selama pembelajaran PBL, baik di dalam maupun di luar kelas; (3) hasil belajar peserta didik meningkat dari siklus I ke siklus II, dengan tingkat ketercapaian mencapai 100% pada siklus II, dan hasil akhir tes menunjukkan ketercapaian belajar sebesar 88,2%; (4) respon peserta didik terhadap pembelajaran PBL sangat positif, dengan 100% peserta didik menunjukkan respon positif.
Psychological Capital as A Moderating Influence of Budget Participation and Transformational Leadership Style on Managerial Performance of Star Hotels
Authors: Ayunda Prihantini Ni Putu , Yadnyana I Ketut , Sujana I Ketut , Adi Erawati Ni Made
Published: October 2024

This research aims to examine and analyze the role of psychological capital (PsyCap) as a moderator in the influence of budget participation and transformational leadership style on managerial performance in star hotels. This research uses a quantitative approach with a population of 18 hotels from 3 to 5 stars in Buleleng Regency. The sampling technique used was a saturated sample, with 134 respondents. Data was collected through questionnaires (google form) and directly (print out). Data analysis was carried out using structural equation modeling (SEM) with SmartPLS 3.2.9 software. The research results show that budget participation and transformational leadership style have a positive effect on managerial performance. Psychological capital has also been proven to strengthen the influence of budget participation and transformational leadership style on managerial performance. It is hoped that the results of this research can help hotels to improve managerial performance through increasing cooperation between leaders and employees, higher budget participation, implementing a transformational leadership style, and positive improvements in the psychological aspects of employees so that they have psychological capital that supports achieving company goals. The study provides several recommendations for future researchers to include macroeconomic factors such as GDP (Gross Domestic Product) growth, inflation, interest rates, and unemployment rates in their research. This inclusion can provide important external context.
Analysis of the Accuracy of Clinical Diagnosis and PA Diagnosis in Appendectomy Patients at AN-NISA Tangerang Hospital Period 2019-2024
Authors: Siti Maryam Sarah , Nurusshofa Zahra , Anisah Anisah , El Anshory Riza , Jantika Dewi
Published: October 2024

Appendicitis is inflammation of the vermiform appendix caused by a blockage in the lumen of the appendix. Anatomic pathology examination is considered the gold standard in confirming the diagnosis of appendicitis, but this examination not always carried out. Method: in this study used descriptive cross-sectional with the aim of comparing the clinical diagnosis and Pathology Anatomy diagnosis of 80 cases of appendectomy at AN-NISA Tangerang Hospital during the period 2019-2024. This study also aims to look at the incidence of malignancy in appendectomy. The results of the 80 cases carried out showed that 7 cases were malignant, 8 cases of appendicitis tuberculosis, 4 cases of malignancy which were initially clinically diagnosed as non-malignant, and 4 cases of tuberculosis which were initially diagnosed as non-tuberculosis. This study found that age was associated with the incidence of malignancy in the appendix (P<0.05). This study also found that patients aged >40 years had a 1,233 times higher risk of experiencing malignancy in the appendix than patients aged <40 years. Conclusion: In a number of cases, clinically significant impacts were found if Pathology Anatomy examination was not carried out. This study recommends pathology anatomy examination during appendectomy, especially in the age group >40 years.
Liquidity, Solvability, Profitability, Size of Company Impact on Stock Prices In Health Service Companies - Hospitals With Dividend Policy As An Intervening Variable Listed On Indonesia Stock Exchange 2018 - 2022 Period
Authors: Faturohman Faturohman , Riyanti Riyanti , Hakim Luqman
Published: October 2024

This study aims to evaluate the impact of liquidity ratio, solvency, profitability, and company size on stock prices, with dividend policy as an intervening variable. The study population includes all healthcare companies listed on the Indonesia Stock Exchange during the period 2018 to 2022, totaling 28 issuers. The research sample was selected using the purposive sampling method, resulting in 6 companies as a sample, with 5 years of research, so that there were 30 observations. The analysis technique used is path analysis, which is carried out with the help of SPSS software version 25. Hypothesis testing is carried out by multiple linear regression. The findings of the study indicate that CR and firm size have a direct effect on dividend policy. In addition, the DER and the size of the company have a direct influence on the stock price. The indirect influence (intervening) was analyzed using the Sobel test, which showed that liquidity (CR), profitability (ROE), and firm size had a significant effect on stock prices through dividend policy (DPR), but were unable to mediate the relationship between solvency (DER) and stock prices.
Teachers' Perspectives on CIM at Elementary Schools
Authors: Darmawan Deni , Ihsan Basyori Sansan , Koswara Ucu , Jam Jamilah Jam , Rohmatul Illahi Padmi
Published: October 2024

This study aims to find out the extent of teachers' perspectives or views on: (1) Learning using ICT as a learning medium or tool, (2) Interactive Multimedia Learning. Based on Canva application can increase students' motivation to learn and, (3) Fun Interactive Multimedia Learning. The research method used by the researcher in this study is a descriptive research method with a quantitative approach. The research was carried out on elementary school (SD) teachers in Bungbulang district, Garut regency. The subject of this study is elementary school teachers with a sample of 75 respondents from all teachers in elementary schools as many as 300 people. In collecting data from the samples taken using a questionnaire or questionnaire technique with the scale used, namely the Likert scale. The results of this study, namely that the teacher's perspective on ICT learning as a medium or learning tool is highly expected and this can be seen from the results of the data analysis collected, namely 36 (48%) respondents answered strongly agree, and 28 (37%) respondents answered yes. This means that respondents agree to ICT-based learning. The conclusion to the perspective of CIM (Canva Interactive Multimedia) is also very significant that 36 (48%) respondents agree and 25 (33%) respondents strongly agree with the learning process using CIM. And finally, as many as 39 (52%) respondents answered yes and 21 (28%) respondents answered strongly agree. This means that the existence of CIM in learning will provide results, namely it will increase interest in learning and be fun. Broadly speaking, the teacher's perspective on CIM provides a positive view that can increase students' motivation in the learning process.
Análisis del sistema de vigilancia de sífilis materna y congénita, Hospital Materno Infantil José Domingo De Obaldía, Chiriquí, República de Panamá, 2010 a 2021
Authors: Ferguson Erika , Rodriguez Edith
Published: October 2024

Introducción: Dos millones de sífilis materna (SM) ocurren en el mundo y  80% lo transmiten verticalmente. La tasa de sífilis congénita (SC) en Panamá entre 2000-2010 fue de 0.2 a 0.8 por 1,000 nacidos vivos (nv). El objetivo del análisis fue caracterizar la SM y el SC  en el Hospital Materno Infantil José Domingo De Obaldía (HMIJDDO). Población y Métodos: Realizamos un estudio descriptivo, transversal, Definimos como caso de SM a cualquier embarazada, puérpera o con aborto con prueba sífilis positiva. Estudiamos si recibienron tratamiento y si la SC fue en recién nacido (RN), aborto o mortinato,  consultando datos de laboratorio, expedientes, tarjetas control prenatal (CPN) y entrevista a pacientes. Calculamos medidas de resumen, proporciones, tasas y razones. Resultads: En 2010-2021 hubo 101,493 nacimientos totales (nt), con 1,960 casos de SM. La incidencia de SM 19.3 por 1,000 nt. La media de edad de la madre fue 26 años. Grupo de edad predominante 20 a 35 años con 1,389 (70.9%). De las SM 1,605 (81.9%) tuvieron CPN, 103 (6.4%) recibieron tratamiento adecuado con sus parejas. De 1,960 embarazadas, se tuvieron 1,709 (87.2%) nv, 171 (8.7%) abortos, 67 (3.4%) óbitos y 13 (0.7%) ectópicos.  De los 1,709 nv, 30 (1.8%) fueron sintomáticos y 24 (1.4%) fallecieron.  La incidencia de SC hospitalari fue 16.5 por 1,000 nt, con letalidad del 80%. Conclusiones: La tasa de incidencia de SC es mayor a la registrada. Recomendamos búsqueda activa de embarazadas y sus parejas, para asegurar el seguimiento y reducir morbimortalidad por SC.
Estudio de serie de casos de viruela del simio, República Dominicana, mayo-diciembre 2022
Authors: Ureña Evelyn , Grey Benoit  , Martha Herrera
Published: October 2024

Introducción. La viruela del simio se ha expandido rápidamente por transmisión entre humanos. En julio de 2022 la OMS declaró la viruela del simio como una emergencia sanitaria internacional. El objetivo fue identificar las características epidemiológicas y clínicas de casos de viruela del simio en la República Dominicana en 2022. Población y Métodos. Una serie de casos confirmados de viruela del simio, notificados al Sistema Nacional de Vigilancia Epidemiológica. Calculamos frecuencias absolutas y relativas e intervalo de confianza de 95% para variables de interés. Resultados. En mayo del 2022 se reportaron los dos primeros de 67 casos confirmados. La enfermedad presentó un patrón propagado alcanzando su pico en julio y agosto. Los casos se concentraron en 13 provincias, 56.7% (38) en Santo Domingo y Distrito Nacional. El 65.6% (44) de los casos fueron hombres. La media de edad fue de 27.7 años (DE:17.9). Los signos y síntomas reportados con mayor frecuencia fueron fiebre 77.6% (52) (IC95% = 65.8, 86.9) y erupciones cutáneas 73.1% (49) (IC95% = de 60.9, 83.2). 31.3% (21) de las lesiones se localizaron en extremidades superiores. El 94.0% (63) (IC95% = 85.6, 98.4) de los casos fueron manejados de manera ambulatoria. Un 4.4% (3) eran VIH+. Un 7.4% (5) cursó de manera asintomática. Discusión. La viruela símica afectó más a hombres. Las provincias de Santo Domingo y Distrito Nacional tuvieron más casos. Se observó fiebre y exantema con predominio en extremidades superiores. La viruela símica pareció ser principalmente sintomática.. Es necesario obtener información sobre las preferencias sexuales.
Employment change in agriculture: Current situation and difficulties in the process of economic structural transformation in the Northern midlands and mountainous regions in Vietnam
Authors:   Institute of Human Studies, Vietnam Academy of Social Sciences, Nguyễn Thị Hoài Lê , Nguyễn Thị Huệ
Published: October 2024

Employment change of workers is both an inevitable trend along with the process of economic restructuring and a need of workers themselves when they want to find new and better jobs. Based on analysis data from the labor and employment survey for the period 2016 2022 and a case study in Thach An district, Cao Bang province, shows that the job conversion trend of agricultural workers here is quite clear, both moving strongly to urban areas to find jobs in non agricultural sectors and converting to jobs within the agricultural sector. Most of those who choose to stay in their hometowns to do farming have stopped producing for self sufficiency and have switched to producing goods for sale, besides, they also choose other ways of livelihood to increase their incomes such as doing extra work and doing side jobs. However, the job transition here is slower than in other regions in terms of both level and quality due to many difficulties, including from the readiness and initiative of workers as well as policies for the labor market and other objective factors. From there, the article makes some recommendations to promote labor transition for rural people in the Northern midlands and mountainous areas.
Interview on Shadow Libraries on Deutschlandfunk
Authors: Pampel Heinz
Published: October 2024

In the latest episode of “Breitband” on Deutschlandfunk Kultur, there is an interview with Dorothea Strecker from our research group at the Berlin School of Library and Information Science on shadow libraries (Belanger 2024). The occasion for the interview was the lawsuit for damages against LibGen in the United States.
Olive Culture Promotion and Financial Sustainability: A Study of University College Zhob, BUITEMS
Authors: Abdul Salam Lodhi  , Muhammad Toseef  , Adnan Nazir  , Khair Muhammad Kakar
Published: October 2024

This study examines the impact of promoting olive culture on the economic empowerment and financial stability of University College Zhob, BUITEMS, and its broader benefits to Pakistan. The initiative aims to convert marginalized land into an olive cultivation venture, enhancing both the aesthetic and economic value  of the institution. By fostering research and innovation in olive culture, the project  has the potential to significantly reduce edible oil imports and generate foreign exchange. This study highlights how olive cultivation can contribute to the  financial sustainability of an educational institution and support regional and national economic development. The study adopted narrative description of the nature of economic gains by following intrinsic case study approach. Starting from the production perspective and expectation to economic gains of olive orchard is optimum. The study findings are very much comprehensive in support of economic gains of the olive project at UCoZ territory in future by mixing agriculture techniques and advancement.
The development of Niška Banja as a health and tourist destination in the kingdom of Yugoslavia
Authors: Velojić Dalibor
Published: October 2024

Since the proclamation of the Kingdom of Yugoslavia and the division into banovines in 1929, Niška Banja has been one of the most attractive destinations for rest and healing. This is supported by the increasing affirmation of tourism as a new economic branch, which was taken more seriously in Yugoslavia in the thirties of the 20th century. The spa's radioactive sources made the spa one of the most famous spa-radioactive spas in the territory of Yugoslavia. Given that it is located 250 m above sea level, protected from winds and a mild climate, it could also serve as an air spa. The spa itself, according to doctors' reports, was equipped with modern sewage and water supply, as well as electric lighting. Despite the insufficient loans from the spa administration, the spa still achieved results in terms of modern bathing facilities and accommodation for visitors. In addition to guests from all over the country and abroad, a large number of residents regularly visited the spa, mainly for bathing. However, despite the efforts made to improve the spa offer, the Banovina authorities could not overcome the private initiative, so that already in 1937, the accommodation facilities in Niška Banja passed into private ownership. Over time, the Niška Banja attracted the urban elite of Niš and the surrounding towns, who, in competition with each other, gave the spa their stamp by building new facilities.
The Formulaic Approach to “Substance-Based Income Exclusion” under Pillar Two: A Genuine Shift in International Tax Policy?
Authors: Screpante Mirna
Published: October 2024

This article critiques the formulaic approach to substance-based income exclusion (SBIE) under Pillar Two and offers recommendations to enhance coherence between Pillar One and Pillar Two.
Salomon Maimon y la filosofía trascendental
Authors: Reyes Jorge
Published: October 2024

El texto examina la crítica de Salomón Maimón a la filosofía trascendental de Kant. Esta crítica se desglosa en dos cuestiones: Por un lado, Maimón se pregunta si existe la experiencia objetiva, entendida como conexión de representaciones sobre la base de reglas a priori (quid facti). Por otro lado, la pregunta sobre la validez del derecho, la justificación, de los juicios sintéticos a priori como condiciones de posibilidad necesarias para pensar la objetividad y de nuestros juicios de experiencia (quid iuris). En conjunto, estas cuestiones han contribuido a formar la imagen de Maimón como un escéptico contrario al proyecto mismo de una filosofía trascendental. Por el contrario, el artículo trata de sugerir que Maimón no está completamente en contra de la filosofía trascendental, sino en contra de la forma específica en que Kant la formula. Maimón sostiene que la distinción entre entendimiento y sensibilidad no puede concebirse como una distinción entre la conciencia y lo que está fuera de la conciencia, por lo que mediante su doctrina de los "diferenciales" (por la que la sensibilidad puede entenderse como el proceso de determinación que hace inteligible un concepto) intenta plantear una filosofía trascendental para la que la cuestión quid iuris se interpreta como la cuestión acerca del modo en que el mundo surge de una actividad determinante completa y total del pensamiento.
Sellars, Kant y Hegel: Reflexiones hegelianas en torno a los modelos grandes de lenguaje
Authors: Aranda Xavier
Published: October 2024

El filósofo pragmatista W. Sellars propuso en su ensayo “Philosophy and the scientific image of man” que sería la ciencia a través de su labor teórica, la que podría dar cuenta del lugar del ser humano en el mundo a través de integrar el marco conceptual de los seres humano y sus relaciones a una ontología común. Proponemos emplear el ejemplo de los grandes modelos de lenguaje (LLM) como ChatGPT 3.5, como el intento más claro de una teoría que pudiera integrar dicho marco conceptual de los seres humanos. Dado el interés de Sellars en las filosofías de Kant y Hegel, realizaremos una crítica a las ambiciones de los LLM en los términos Sellarsianos señalados, y sobre la posibilidad de que estos transicionen de modelos de lenguaje a modelos de conocimiento. Nuestra crítica se centrará en la posibilidad de un criterio de unidad (como el empleo de herramientas que auxilien en el razonamiento inferencial) con el fin de evitar las alucionaciones, así como el principal motor detrás del posible paso a los modelos de conocimiento. Señalaremos que este esfuerzo se encuentra en la posición que Hegel denomina idealismo subjetivo, mostrando que un principio de explicación no puede ser predictivo. Esto tendrá como consecuencia la imposibilidad integrar esa ontología común propuesta por Sellars.
Development, Structural Characterization, And Laser Beam Powder Bed Fusion Of Ti/Nb/Ta Alloy Powders
Authors: Weinmann Markus , Stenzel Melanie , Johannsen Jan , Lauhoff Christian , Niendorf Thomas
Published: October 2024

The development of spherical Ti/Nb/Ta alloy powders with compositions Ti-xNb-6Ta (x = 20, 27, 35 wt%) by electrode induction melting gas atomization (EIGA) and their processing by laser beam powder bed fusion (PBF-LB/M) are reported. Microstructure investigations by X-ray diffraction and scanning electron microscopy including energy dispersive X-ray spectroscopy and electron backscatter diffraction reveal a significant impact of the composition on the structural properties, i.e., phase evolution and texture, and the possibility for a direct microstructure design. Ti-rich alloys preferably solidify in the orthorhombic α’’-phase, whereas in Nb/Ta-rich alloys the body-centered cubic (bcc) β-phase is observed. The alloys possess a very broad processing window and can be printed to full density over a wide range of printing parameters. Additively manufactured Ti-27Nb-6Ta shows a unique behavior, since strength and elongation at failure strongly depend on the printing parameters applied. The underlying microstructural mechanisms, i.e., the influence of the laser energy on texture effects and phase formation, are discussed.
A Comparative Life Cycle Assessment Study Of Laser Powder Bed Fusion, Binder Jetting And CNC Machining Processes
Authors: Gopaluni Aditya , Puukko Pasi , Antikainen Atte , Lotta Hepo-oja , Reijonen Joni
Published: October 2024

Additive Manufacturing (AM) is considered as one of the most suitable methods for building parts with complex designs. AM is described as an efficient and sustainable manufacturing method, when compared to the traditional manufacturing methods. To understand the credibility of AM as a sustainable process, a study of the life cycle assessment (LCA) was conducted for PBF-LB, BJT-M and CNC machining for manufacturing of an impeller. The LCA calculations were made for different scenarios with respect to feedstock. It was observed that BJT-M had the largest CO2 footprint compared to PBF-LB, followed by CNC machining. It was concluded that the BJT footprint is highest owing to the extra steps involved in making the part user ready, mainly sintering. This study has been conducted as natural extension of a previous study conducted on LCI of PBF-LB and CNC processes and approaches the LCA from the point of view of raw material.
Comparison Of Experimental And Numerical Heap Profiles During Powder Spreading In Additive Manufacturing Processes
Authors: Stephan Maxime , Roux Guilhem , Ablitzer Carine , Garandet Jean-Paul , Burr Alexis
Published: October 2024

The powder spreadability partly drives the robustness of powder-bed-based additive manufacturing processes as well as material performances of the printed parts. The full comprehension of the mechanisms involved during powder spreading is therefore paramount. Literature showed that the impact of friction between the powder and previous layers is significant on powder bed quality. Thus, this work presents an experimental test bench that captures the heap profile during spreading in real time. Indeed, it is found that the heap profile and recoating angle are sensitive to the platform surface roughness and powder properties. Improving the interaction of the powder with the platform results in a larger recoating angle, and improves the powder bed density. This is done by increasing the friction through cleverly oriented ridges or by reducing powder rolling friction through sphericity. Our test bench is relevant for understanding powder deposition experimentally, and has interest for further spreadability optimizations.
Optimizing The Production Process Of Ndfeb Magnets
Authors: Wimbert Lars , Lindenau René , Neumann Bettina , Schnaider Edwin
Published: October 2024

Permanent magnets and especially NdFeB (Neodymium Iron Boron) magnets are one of the most critical components in the global manufacture of modern electric motors. The production process of NdFeB magnets contains a large number of different procedures, all of which can have an influence on the properties of the end product. Although at first glance, relatively similar to the classic PM process, the manufacturing route involves some special challenges that will be examined in more detail in this paper. Starting with the optimization of the hydrogen decrepitation of the base material, this contribution will additionally describe the effect of different milling parameters on microstructure and magnetic properties, the procedure of dimensionally precise compaction and sintering of magnet preforms and the magnetic testing of finished magnets.
Recycling Of 316 L Powder And Scrap From Additive Manufacturing Processing
Authors: Brabie Liviu , Kazi Sofia , Strondl Annika , Mellin Pelle , Fedina Tatiana , Leach Lindsay , Hryha Eduard
Published: October 2024

This study focuses on advancing the sustainability of powder-based metal additive manufacturing (AM), with focus on powder bed fusion – laser beam (PBF-LB). As a result of numerous reuse cycles during PBF-LB, powder degradation occurs due to the spatter accumulation and hence increase in bulk oxygen content. Hence, heavily reused 316L powder and scrap material from PBF-LB processing (support structures, failed components, etc.) were re-melted into ingots. High-pressure gas atomization trials for 316L material were performed at Swerim AB. The powder produced was classified to PBF-LB size fraction (15-45 µm) and had a total oxygen content of 234 ppm, characterized by excellent processability by PBF-LB. Subsequent investigation of powder properties before and after re-atomization was performed to evaluate the possibility of utilizing scrap as feedstock material in AM. Results indicate high potential for powder recycling in the case of 316L.
Sintering Atmospheres for the Vacuum Sintering of 316L Stainless Steel
Authors: Valsecchi Giorgio
Published: October 2024

Sintered stainless-steel components are widely adopted in the automotive, biomedical, electronics and fashion industries. For complex shaped sintered stainless-steel parts, metal injection molding (MIM) has been the primary production technology for decades but, in past few years, sinter-based additive manufacturing (SBAM) has grown significantly in popularity. Both metal injection molded and additively manufactured stainless-steel parts are often sintered in vacuum furnaces to prevent oxidation, contamination and obtain high densities with bright surfaces. In that case, a partial pressure of inert or reactive gas is commonly adopted to suppress evaporation of volatile alloying elements (i.e. chromium and nickel) and to help remove binder residuals. During sintering, the gaseous atmosphere interacts with the steel influencing its final mechanical and corrosion properties. In this experiment, the effects of sintering on vacuum furnaces with different atmospheres (argon or hydrogen) on 316L parts manufactured through MIM and metal binder jetting SBAM were investigated.
Metal Powder Production From Machining Metal Scrap Using Centrifugal Atomization
Authors: Pijuan J. , Maicas H. , Cegarra S.A. , Hernández R. , Baldi T. , Font S. , Nin J.
Published: October 2024

In this study it is proposed to use machining metal chips with a pre-established and controlled chemical composition as raw material for metal powder production. The centrifugal atomization technology is used to produce this metal powder, bridging the gap between collecting recyclable metal scraps and obtaining the final powder, therefore enhancing the overall sustainability of the process. This study involves the collection of metal chips, their treatment for the removal of cooling liquids and other residues, and their subsequent use as raw material for metal powder manufacturing. Three different case studies are presented, including AlSi7Mg aluminium alloy, a Sn-based alloy also called White Metal alloy or Babbitt alloy, and a Ti6Al4V titanium alloy, illustrating the versatility and applicability of the proposed approach.
Small Batch Powder Production For Additive Manufacturing By Ultrasonic Atomization
Authors: Holzer Alexander , Nahringbauer Peter , Stark Lukas , Gierl Mayer Christian
Published: October 2024

Due to the strong dependency on powder supplier, additive manufacturing is restricted to a small range of materials and connected to big orders. Competitive and profitable production often requires serial production and therefore small products. The powder preparation, starting by producing the desired material composition, allows to design customized powder specialised for each additive application. In our case, ultrasonic atomization realizes batch-wise material research and prevents waste of material. In this work, opportunities and difficulties of the wire-fed ultrasonic atomization process is discussed. The main focus are stainless steels, e.g. 316L and variants, for lithography-based metal manufacturing. Furthermore, the powder characterisation, the tools for adjusting the powder atomization and first steps of additive manufacturing are presented. Results show that ultrasonic atomization provides narrow powder size distribution, almost perfect rounded powder without any satellites.
Intelligent MPPT for High Gain Zeta Converter for Standalone PV Application with Galvanic Isolation
Authors: B Varsha , AS Monikandan
Published: October 2024

In this paper, Standalone PV system is designed to operate without the need of electric utility grid which are commonly designed to supply specific DC electric loads. These type of PV system are generally powered using photovoltaic array and consist of solar charging modules, controllers and regulators. The objective of this work is to implement the Radial Basis Function Neural Network (RBFNN) based Maximum Power Point Tracking (MPPT) technique to attain constant DC link voltage of the ZETA converter. This method utilizes a ZETA converter to achieve better voltage gain and lower ripple in the output current and voltage. Using an Artificial Neural Network (ANN) controller to operate a high frequency converter, which improves power conversion efficiency. To ensure safety and prevent electrical faults, an isolation transformer provides galvanic isolation between the high frequency converter and the PV system. Galvanic isolation avoids electrical faults from being transmitted and safeguards connected loads. The rectifier is used to supply the Direct Current (DC) load with the output from the isolation transformer. The rectifier changes the transformer’s Alternating Current (AC) output into DC current to power DC loads. An intelligent MPPT is employed to stabilize the converter’s output voltage and address the intermittent characteristics of PV, and also assists in sustaining the DC link voltage without alterations and ripples from the converter. The efficiency of this work is authenticated via MATLAB simulation 2021a.
Advanced Controller System with Hybrid Renewable Sources Enabling Vehicle-To-Grid and Grid-To-Vehicle Operations
Authors: VS Vaisali , R Anuja
Published: October 2024

Power demand is rising worldwide, forcing the search for an alternative source to solve the imminent power crisis, which is expected to be accomplished through the deployment of grid synchronized electric vehicles (EV). Wind and solar energy are incorporated into this integration to those concerns. One smart grid innovation that permits energy exchange between the EV and the grid is vehicle to grid (V2G) technology. For the purpose of charging EVs, this research proposes employing hybrid energy. Here, the neighboring household’s linear and non linear demands are powered by the excess electricity from the photovoltaics (PV) panel, wind turbine, and AC generator that is utilized to charge the EV battery. Because of its dependability and independence from the real system model, a proportional integral (PI) controller is used to maximize the DC voltage extracted from the PV panel. The improved DC voltage overall is a result of the SEPIC converter’s improved DC output. Concurrently, an AC generator is incorporated into the system to supply extra power to the grid. An artificial neural network (ANN) controller is used to convert the power generated by the PV panel’s Sepic conversion process into an improved output that is then converted to AC using a 3 phase Voltage Source Inverter (VSI). Harmonic components in the VSI output are corrected with an LC filter to ensure grid compatibility and safe current injection into the grid. This paper discusses the usage of a bidirectional converter to adjust the EV battery’s voltage. MATLAB 2021a / Simulink software is used to simulate and validate the proposed approach.
The Influence of Academic Supervision and the Use of the Merdeka Mengajar Platform on the Teaching Quality of High School Teachers in the Rambang Kuang Sub-district
Authors: Yulianti Yulianti , Arafat Yasir , Rohana Rohana
Published: October 2024

This research, conducted under the PGRI Palembang University Education Management Postgraduate Program with Main Supervisor Mr. Assoc. Prof. Dr. Yasir Arafat, S.E., M.M. and Co-supervisor Mrs. Assoc. Prof. Dr. Rohana, M.Pd CIQnR, aims to determine and describe the partial and simultaneous influence of academic supervision and the use of the PMM (Platform Merdeka Mengajar) on the teaching quality of teachers in state high schools in the Rambang Kuang District. The population for this study consisted of all teachers at State High School 1 and State High School 2 in the Rambang Kuang District, totaling 53 teachers, with a total sample size of 53 using the saturated sampling technique. A descriptive analysis method with a quantitative approach was applied, utilizing observation, questionnaires, and documentation for data collection, and data analysis was performed using the t-test and F-test. The findings of the study indicate that: (1) the principal's academic supervision has an influence on the teaching quality of teachers in State High Schools in the Rambang Kuang District; (2) the use of PMM positively impacts the teaching quality of teachers in the district; and (3) a combination of the principal's academic supervision and the use of PMM simultaneously influences the teaching quality of teachers in State High Schools in the Rambang Kuang District by 94.6%, with the remaining 3.4% influenced by other variables not examined in this research.
Impact Of Cardiovascular Exercises On Sleep Quality In Sedentary Individuals: An Experimental Investigation
Authors: Hamza Muhammad
Published: October 2024

Lack of sleep is still a crucial problem for many sedentary persons in terms of keeping good health. This study examines the influence of cardiovascular exercise on the quality of sleep-in sedentary individuals and emphasizes the benefits of non-pharmacological sleep aids. Thirty individuals total were enrolled in the study and split into two groups: the experimental group (n = 15) exercised for eight weeks, while the control group (n = 15) continued to lead sedentary lives. The Pittsburgh Sleep Quality Index (PSQI) was utilised by the researcher to assess participants' sleep quality both prior to and following the intervention. The mean PSQI scores for the intervention group decreased from 14.07 to 8.07 (p<0.001), indicating a significant improvement in sleep quality. The control group, on the other hand, did not display any prominent changes (p=0.104). In addition, the post-intervention analysis declared that the experimental group had significantly better sleep quality than the control group (p<0.001). These results [1]established the effectiveness of planned cardiovascular exercise programs as a non-pharmacological treatment to improve sleep quality in this population and indulge strong evidence for the positive effects of regular cardiovascular exercise on sleep quality in sedentary people.
View from above: Farmland infrastructure and its impacts on agricultural landscapes
Authors: Yu Qiangyi , Hu Qiong , Wu Hao , Wu Wenbin
Published: October 2024

Agricultural landscapes are shaped by the interaction between natural elements and human activities. The development of farmland infrastructure has directly added man-made objects or indirectly altered the production capacity, thereby impacting these landscapes. Earth Observation (EO), primarily satellite imagery, plays a crucial role in observing and monitoring the Earth’s surface and provides a valuable tool for understanding the pattern and structure of agricultural landscapes by offering information on land cover types. However, due to the varied and complex types, shapes, sizes, and functionalities of farmland infrastructure, the approaches and methods for observing its characteristics are limited. This limitation further obstructs the understanding of its impacts on agricultural landscapes. In this paper, we summarize the challenges and opportunities in exploring farmland infrastructure using EO and aim to comprehensively understand the interaction between natural elements and human activities in shaping agricultural landscapes.
On Indian summer monsoon droughts and teleconnections over the past millennium
Authors: Sinha Ashish , Steiger Nathan. J. , Tan Liangcheng , Li Hanying , Kathayat Gayatri , Cheng Hai
Published: October 2024

Historical documentary accounts from the Indian subcontinent document several decade-to-multidecade clusters of severe Indian summer monsoon (ISM) droughts over the past millennium. Many of these putative droughts have no counterparts in the instrumental period. An objective assessment of the severity and frequency of these droughts and their teleconnections to other parts of the climate system remains uncertain. Here, we use the Paleo Hydrodynamics Data Assimilation (PHYDA) product to address this gap. PHYDA reproduces historical intervals of increased drought frequency with high fidelity and reveals multiple instances of multi-year “black swan” droughts— rare, severe events with significant societal impacts that are consistent with historical accounts. We find that droughts, as well as extended periods of dryness, occurred under both El Niño and non-El Niño conditions, with El Niño explaining ~ 49% of all drought instances. A large number (~42%) of non-El Niño type droughts were forced by cooler extratropical SST anomalies in the North Atlantic region. While El Niño was an important driver, its association with droughts varied considerably, accounting for between 15-80% of droughts depending on the century. The PHYDA’s millennial-length perspective supports expanding the El Niño-centric paradigm of droughts into a framework that includes extratropical teleconnections.
Inclusión y Diversidad: Innovaciones Tecnológicas para Estudiantes con Discapacidad en Entornos de Aprendizaje Digital
Authors: Mora Mera Meyvilin María , Montesdeoca Vera Diana Elizabeth , Robles Ramírez Alejandro Jesús , Vera Molina Rosa Maria
Published: October 2024

La inclusión y diversidad en los entornos educativos es de gran importancia en nuestros últimos años, particularmente en lo que respecta al alumnado con discapacidad. Las innovaciones tecnológicas han surgido como esenciales para mejorar la accesibilidad y la equidad en la educación digital. Este artículo de revisión escrita examina las principales tecnologías emergentes entre 2019 y 2024 que facilitarán el aprendizaje de los estudiantes con la capacidad de utilizar la tecnología digital. Analizamos la vena de estudios de autor que exploraron el impacto de las plataformas digitales de aprendizaje, la inteligencia artificial, la realidad aumentada y las tecnologías de apoyo en la inclusión educativa. La revisión reveló que, si bien estas tecnologías han demostrado un impacto positivo, también existen barreras persistentes para quienes actualmente vulneran a los estudiantes con discapacidad, como la falta de una formación adecuada y necesaria para los estudiantes y la necesidad de un diseño universal de Modos de aprendizaje que se ajustan a tus necesidades. Además, identificamos áreas de mejora de estas tecnologías para responder de forma más eficaz a las necesidades específicas de los usuarios. Los resultados sugieren que, considerando los importantes avances en la implementación de tecnologías inclusivas, las pérdidas son considerables. La integración efectiva de estas tecnologías depende no sólo de las innovaciones en cuestión, sino también de un esfuerzo coordinado entre gobiernos, instituciones educativas y desarrolladores de tecnología para garantizar que estas tecnologías se adapten a las necesidades de todos los estudiantes y promuevan una verdadera equidad.
Identifikasi molekuler lepidopteran predator Coccidae pada tanaman kopi di Sukabumi
Authors: Hapsari Arlia Dwi , Santoso Sugeng , Kusumah R. Yayi Munara
Published: October 2024

Ngengat predator yang diduga berpotensi untuk dikembangkan sebagai agens pengendali hayati kutu tempurung (Coccidae) ditemukan di Sukabumi, Jawa Barat. Kutu tempurung merupakan hama pada tanaman kopi (Coffea spp.). Namun demikian, informasi nama spesies ngengat predator tersebut, belum pernah dilaporkan di Indonesia, khususnya secara molekuler. Oleh karena itu, penelitian ini bertujuan untuk mengetahui spesies predator melalui identifikasi secara molekuler. Penelitian dilaksanakan mulai Desember 2022 sampai dengan September 2023. Predator diambil dari pertanaman kopi yang terserang kutu tempurung di Sukabumi. Identifikasi sampel dengan teknik PCR terhadap fragmen DNA mitokondria COI dilakukan di laboratorium Departemen Proteksi Tanaman IPB, Bogor. Dari hasil pengolahan data sekuensing, diperoleh sekuen DNA dengan panjang fragmen 658 pb. Sekuen DNA sampel predator memiliki kemiripan dengan spesies Autoba rubra, dengan tingkat homologi 95,44% (GenBank) dan 95,39% (BOLD Systems). Berdasarkan analisis filogeni, sampel juga berkerabat dekat dengan Mataeomera sp. dan A. dispar. Hasil penjajaran sekuen DNA menunjukkan bahwa sampel dan empat voucher spesies A. rubra yang ada di database GenBank memiliki variasi sebesar 7,58%. Berdasarkan hasil identifikasi secara molekuler, dapat disimpulkan bahwa ngengat predator yang memangsa kutu tempurung pada tanaman kopi di Sukabumi merupakan spesies A. rubra.