bluuebunny/crossref_metadata_2025 huggingface dataset:
Pengaruh Pendekatan Inkuiri Berbasis Eksperimen dengan Menggunakan Media Sederhana untuk Meningkatkan Hasil Belajar Fisika
Authors: Fegi Fegi , Ali Muhammad , Ali Muhammad
Published: January 2023

Penelitian ini dilakukan dengan tujuan untuk mengetahui ada tidaknya pengaruh pendekatan inkuiri berbasis eksperimen dengan menggunakan media sederhana terhadap hasil belajar fisika pada siswa kelas XI IPA SMA Negeri 3 Luwuk. Jenis penelitian ini merupakan eksperimen kuasi dengan the equivalent pretest-posttest goup design. Populasi penelitian ini adalah seluruh siswa kelas XI IPA SMA Negeri 3 Luwuk. Teknik sampling yang digunakan dalam penelitian ini adalah purposive sampling dengan sampel penelitian ini adalah kelas XI IPA 1 sebagai kelas eksperimen dan kelas XI IPA 2 sebagai kelas kontrol dengan jumlah siswa masing-masing kelas sebanyak 18 orang. Instrumen hasil belajar berupa tes pilihan ganda yang telah divalidkan melalui validator ahli. Tes hasil belajar yang diperoleh menunjukkan bahwa skor rata-rata kelompok eksperimen 19,50 lebih tinggi daripada kelompok kontrol yaitu 16,94. Uji hipotesis Uji-t (dua pihak), diperoleh  = 3,65 dan = 2,024 pada taraf nyata ⍺ = 0,05. Ini berarti bahwa nilai  berada diluar daerah penerimaan Ho. Sehingga dapat disimpulkan bahwa ada Pengaruh Pendekatan Inkuiri Berbasis Eksperimen dengan Menggunakan Media Sederhana untuk Meningkatkan Hasil Belajar Fisika pada Siswa Kelas XI IPA SMA Negeri 3 Luwuk.
Search Behavior For Millennial Generation Information
Authors: Majidah Majidah , Widiyanto Widiyanto
Published: January 2023

The purpose of this study was conducted to determine the behavior of millennial generation before, during and after searching for information. This research uses descriptive research with a quantitative approach and data collection methods using a questionnaire. The population in this study is the Open University library science students aged 20-24 years, who take tuton classes in the 2019.1 period. Samples were taken using the Slovin formula, so that a sample of 100 people was obtained. The questionnaire was distributed to online students through the Open Universits elearning page. The sample used in this study is accidental sampling in which the researcher chooses a sample from anyone who meets the criteria as a population. This research uses Ellis theory, in which the theory the researcher divides into 3 stages, namely before, during and after searching for information. The results showed that the behavior of Online Class Library Science Students after searching for information was positive, with a score of 3.09, this score was on an interval scale of 2.52 - 3.27. Behavior of Online Class Library Science Students when searching for information is positive, with a score of 3.08, this score is on an interval scale of 2.52 - 3.27. While the Online Class Library Science Student Behavior after searching for information is very positive, with a score of 3.30, this score is on an interval scale of 3.28 - 4.03. Based on the results of the study, the information seeking behavior of Online Class Library Science Students as a whole includes aspects before, during and after searching for information is positive, with a score of 3.16, this score is on an interval scale of 2.52 - 3.27
Addressing Fragmentation of Health Services through Data-Driven Knowledge Co-Production within a Boundary Organization
Authors: Pine Kathleen H , Hinrichs Margaret , Love Kailey , Shafer Michael , Runger George , Riley William
Published: January 2023

Behavioral healthcare services involve multiple disconnected sectors and providers serving the same populations. Efforts to identify and address service delivery problems are hampered by fragmentation of datasets. We conducted an engaged research project in which we formed a boundary organization and developed a knowledge co-production process centered on collaborative data sharing and visualization. Multisector participants in [location] worked to access and share data and to collectively interpret the resulting integrated data through visualizations using four knowledge co-production practices: collective interaction with data, perspective taking, reflection & debrief, and iteration of visualizations. The knowledge co-production process was evaluated using qualitative methods. This research extends sociotechnical research on knowledge co-production by proffering collaborative data sharing and visualization as a knowledge co-production process that can extend across disconnected and disparate social groups and contributes to community informatics by highlighting the role boundary organizations can play in facilitating data sharing and data-driven problem solving between fragmented sectors.
La privanza de un rey inesperado: las primeras expresiones de favoritismo de D Manuel I de Portugal
Authors: Pelúcia Alexandra
Published: January 2023

Manuel I de Portugal (reinado 1495-1521) llegó al trono inesperadamente, al igual que antes se había convertido en duque sorprendentemente. Así, sus primeros años no estuvieron marcados por la habitual dinámica de relaciones observada en torno a los príncipes herederos. Su camino hacia el trono encontró resistencia, pero también vio surgir una facción en su apoyo. Este artículo identifica a los miembros del círculo privado de Manuel cuando se convirtió en rey. Además, analizamos su entorno para identificar a sus favoritos. Para ello, destacamos un episodio de los primeros años del reinado, su peregrinación privada a Santiago de Compostela en 1502. El análisis de la elección de sus acompañantes es uno de los ejemplos que ilustran cómo a lo largo de su reinado Manuel trató de alcanzar un equilibrio entre facciones, favoreciendo a los servidores de siempre y promoviendo nuevas relaciones estrechas para fortalecer el poder real.
Divise a Palazzo
Authors: Bianchi Paola
Published: January 2023

La definizione dell'immagine militare della corte dei Savoia si realizzò compiutamente a seguito di alcune riforme avviate alla fine del regno del re Carlo Alberto, trovando applicazione nel corso dei decenni successivi. Tali riforme investirono non solo nominalmente la corte torinese, successivamente corte del Regno d'Italia, ma agirono sul profilo dei suoi organigrammi. Si trattò di un fenomeno, dunque, con effetti sociali e culturali, verificabile attraverso lo studio prosopografico dei soggeti coinvolti. La nuova "Casa militare" accolse, in tal senso, non solo la contrattazione, ma una più stretta commistione, di quanto non fosse stato nei secoli precedenti, fra dimensione curiale e governo dello Stato. Così, almeno, sino all'inizio del XX secolo, quando un regio decreto, che non aveva avuto precedenti, decise che la scelta delle figure chiamate a ricoprire le tre principali cariche di corte (ministro della Real Casa, prefetto di Palazzo e primo aiutante di campo) fosse sottoposta al controllo del governo.
La actividad política del duque de Riánsares durante el Sexenio Revolucionario
Authors: Martínez García Cristina Bienvenida
Published: January 2023

La actividad política de Fernando Muñoz, duque de Riánsares, durante la segunda mitad del reinado de Isabel II está poco estudiada y apenas se le ha dado relevancia. Desde 1854, año en el que tuvo que exiliarse a Francia, junto con su esposa, María Cristina de Borbón, Muñoz no intervino directamente en la política. Ahora bien, eso no significa que se mantuviera al margen, al contrario, participó en los principales acontecimientos políticos por los que atravesó el Estado español y lo hizo como él sabía, a través de redes clientelares y relaciones personales. Para ello, construyó un nuevo grupo de poder a través del que distribuía sus mensajes y ordenaba sus actuaciones, el que se autodenominó «Los Tres Mosqueteros». La actividad del grupo se aceleró tras la revolución de 1868, cuando los Borbones fueron expulsados del trono y Fernando Muñoz, desde el principio, intentó su restauración.
Entre Palacio Real y el Casino del Príncipe: conmemoraciones regias, apadrinamientos y grandeza de España (1836-1930)
Authors: Zozaya-Montes María
Published: January 2023

El Casino del Príncipe fue una asociación fundada en 1836, al calor del liberalismo monárquico constitucional ¿tuvo algo que ver con el rey, el palacio real, o el sistema relacional de la Corte? Diversos estudios mostraron su papel como espacio de sociabilidad para la adaptación del liberalismo político, donde actuó de manera informal como motor de cambio, uniéndose a los mecanismos que promovieron una modernización en sentido político. Pero, ¿dónde quedaban las fuerzas tradicionales, aquellas que habían permanecido junto al poder monárquico durante siglos? ¿se relacionaban en el casino de forma presencial antiguos y nuevos poderes? ¿qué papel cumplía la idea de palacio o su cercanía simbólica? ¿mantenían alguna relación con sus integrantes, fuesen gentiles-hombres, grandes o reyes? Este estudio aborda tales cuestiones entre Palacio Real y el Casino del Príncipe (o de Madrid), explorando relaciones sociales, celebraciones simbólicas y padrinazgos.
Effects of pressurized superheated-steam heat treatment on set recovery and mechanical properties of surface-compressed wood
Authors: Gao Zhiqiang , Huang Rongfeng , Chang Jianmin , Li Ren , Wu Yanmei
Published: January 2023

The recovery behavior and selected mechanical properties were studied for Populus tomentosa wood subjected to surface compression followed by heat treatment. The surface compression of wood was carried out in an open hot-pressing system at 180 °C with compressed thickness of 2 to 18 mm. The surface-compressed wood was treated by atmospheric heat treatment or 0.30 MPa pressurized superheated-steam heat treatment at 180 °C for 2 h. The results showed that the set recovery of compressed wood decreased with increasing compressed thickness before post-treatment. Atmospheric and pressurized heat treatment reduced the average set recovery of compressed wood significantly from 12.9% to 4.1% and 1.5% respectively, after conditioning at 40 °C and 90% relative humidity. Moreover, mechanical properties including the modulus of elasticity (MOE), modulus of rupture (MOR), hardness, and surface hardness increased with elevating compressed thickness. Both atmospheric and pressurized heat treatment reduced the MOR, hardness, and surface hardness of compressed wood. Analysis of variance showed that the effects of heat treatment on mechanical properties was not significant, except pressurized heat treatment decreased hardness significantly. With a compressed thickness of 10 mm, MOE, MOR, hardness and surface hardness were increased by 52.6%, 36.4%, 122.0% and 129.6%, respectively, compared with untreated wood.
Optimization of weathered coal biodegradation by Penicillium aculeatum 13-2-1 and UV-visible spectral characteristics of active degraded products
Authors: Ren Jianguo , Zhang Chao , Wang Junli , Cai Jing
Published: January 2023

Weathered coal is widely distributed in many provinces in China. It has great potential utilization values as soil ameliorant in sustainable agriculture. To find the optimal condition for the biodegradation of weathered coal and obtain the spectral characteristics of active degraded products of coal, the bioactivation of humic acid in weathered coal is essential. In this study, a fungal strain (Penicillium aculeatum 13-2-1) capable of degrading weathered coal was isolated from the rhizosphere of Zelkova serrata. The experimental results using classical one factor at a time method showed that weathered coal of 1.0 g, inoculum of 150 µL, and sodium nitrate of 0.10 g in 100 mL broth were the optimal conditions for the biodegradation of coal, respectively. The variance analysis of orthogonal tests illustrated that the three factors had little effects on biodegradation of weathered coal, but the weathered coal significantly negatively affected the contents of soluble humic acids in liquid coal products. Different diluted solutions of liquid coal products for all orthogonal combinations promoted the growth of the seeds of Brassica napus L., especially on radicles. The UV-visible spectra of the liquid coal products for all combinations presented the differential absorbance closely associated with the quantity of sodium nitrate in medium.
Anatomical structure and copper microdistribution in mechanical, biological, and laser incised spruce and larch refractory woods
Authors: Bakir Davut
Published: January 2023

The anatomical structure of wood and the application of three different incision pretreatments affect the distribution of preservatives in refractory woods. This study focused on Picea orientalis (L.) Peterm.) and Larix decidua Mill. and investigated the distribution of copper-based preservatives in the wood microstructure. Different incision pretreatments were applied before impregnation to increase the permeability of spruce and larch sapwood samples. After the incision pretreatments, transverse cross-sectional surfaces of the samples were sealed with polyurethane-based paint to prevent excessive preservative uptake into open ends of longitudinal tracheid lumens. The samples were then impregnated with Celcure C4, by applying a vacuum method. The structure of wood samples with preservatives before and after the incision pretreatments were observed. Copper microdistribution was observed to increase significantly in refractory wood species after different incision pretreatments, especially in larch wood. The degradation of pits caused by biological incision effectively increased the microdistribution of copper. The difference in the microdistribution of increased copper with the laser and mechanical incision pretreatments – following the same incision model – was attributed to the different anatomical structure and density of spruce and larch wood species and the fact that the hole depth and geometry were different in the laser and mechanical incision processes.
Properties of bio-oil and bio-char from high-intensity microwave-assisted pyrolysis of oil palm shell waste
Authors: Jansuwan Kanokporn , Jumrat Saysunee , Punvichai Teerasak , Karrila Seppo , Sirikitputtisak Tule , Songthongkaew Nitipong , Pianroj Yutthapong
Published: January 2023

Microwave-assisted pyrolysis was applied using four magnetrons to implement a high intensity at a power density of 0.3107 W/m3 with 800 g specimen size. The 23 full factorial experimental design manipulated the factors temperature, mixture ratio, and pyrolysis time, seeking to maximize %yield at minimum cost of crude bio-oil. The optimum according to model fit had a temperature of 611 °C with a 70:30 sample mixture ratio of oil palm shell (OPS) to activated carbon (AC), and time 39.6 min for a yield of 15.3% and 8.48 Thai-Baht/cc cost. The coefficients of determination were R2 = 93.99% and 94.00% for the respective models. In the aqueous phase of crude bio-oil, acetic acid was the dominant chemical component at 55.2%, whereas phenol was dominant in the bio-oil phase at 44.2%, from 400 °C pyrolysis temperature. The assessed properties of bio-char were proximate composition, heating value, specific surface, and pore volume, and these were improved compared to the raw OPS. However, these properties must be improved further to match commercial-grade activated carbon.
In Search of “Cultural Saints”
Authors: Kučinskienė Aistė
Published: January 2023

Viktorija Šeina, Savas svetimas dainius. Adamas Mickiewiczius lietuvių literatūros kanone (1883–1940): monografija, Vilnius: Lietuvių literatūros ir tautosakos institutas, 2021, 304 p.
Pursuing the Past: Hunting in Józef Weyssenhoff’s The Sable and the Girl
Authors: Pauliukevičiūtė Dalia
Published: January 2023

The article investigates Józef Weyssenhoff’s novel The Sable and the Girl (Polish: Soból i panna) published in 1911. The name of its author is rarely mentioned when discussing the Polish literature of the late 19th and early 20th century. Most literary critics agree, however, that the signature feature in Weyssenhoff’s works is his poetic descriptions of nature and hunting, especially in aforementioned work. The article analyses the interplay of Lithuanian and Polish cultures in this text as well as its Lithuanian literary geography. The question is raised as to what cultural and literary meanings might have been concentrated in the novel at the turn of the 20th century, and what Polish-Lithuanian cultural connections were revealed due to it. The article introduction offers a brief overview of the changes in depicting hunting in Western literature and cultural tradition, and considers to what extent those insights are still valid when analysing the works of various authors attributed to and impacted by the legacy of the Grand Duchy of Lithuania. The article further traces the competing plots of love and hunting in Weyssenhoff’s novel, and the writer’s ambition to employ the symbol of the lost world – hunting. A combination of extratextual references, internal textual relations, and detectable intertexts has been employed to interpret the novel; therefore, when delving into the development of the narrative, none of the theories (e.g., intertextuality) is clearly dominant. When discussing The Sable and the Girl in the Lithuanian cultural field, the historical contexts of the early 20th century Russian Empire, the intertexts of Polish literary tradition as well as the concept of hunting and a colonial look at the sociocultural environment where the narrative is developed remain of similar significance.
„I understand life as the Cry of some Voice...“: Correspondence between Sigitas Geda and Kornelijus Platelis (1977–1981)
Authors: Kmita Rimantas
Published: January 2023

The publication presents the correspondence between the poets Sigitas Geda (1943–2008) and Kornelijaus Platelis (b. 1951) in letters in 1977–1981. The publication was prepared with letters from that period found in the personal archives of Uršulė Gedaitė and Kornelijus Platelis. The 13 letters from the late 1970s and early 1980s show the moods of the stagnation years, the hesitations of people in culture, and the reflections on the meaning of creation in the atmosphere of Soviet stagnation. Compared to Geda‘s other known letters, those written to Platelis are characterised by a closer and more open relationship with the addressee. They contain the most important and quite intimate reflections on the creative process, as well as frank evaluations of colleagues‘ works, which differ from those we read in published reviews or journalism.
Travel as the Answer: Bodo Kirchhoff “Widerfahrnis”
Authors: Katinienė Violeta
Published: January 2023

Travels and the longing for afar have been and still are the source of inspiration for many authors. This article analyses Bodo Kirchoff’s short story “Widerfahrnis” (“Encounter”), which belongs to the genre of travel literature and extends the literary tradition of German authors to choose the theme of travel to Italy in their work (Johann Wolfgang von Goethe, Heinrich Heine, Thomas Mann, etc.). The short story raises the existential questions of longing for love, loneliness, confrontation with refugees, and moral and social aspects of relations with them. The article aims to reveal how the structures of experience described by the German phenomenologist Bernhard Waldenfels appear in the work of Bodo Kirchhoff. What happens to us does not happen without our involvement but goes beyond it. The experience begins not with the intentional gaze of the subject, but when someone (a stranger) touches us, encounters us, causes us to react and raises tension. Bernhard Waldenfels attributes the encounter to the realm of pathos, meaning to the realm of feelings. Response or the inevitable response to an encounter comes earlier than an understanding or an answer. Although the title of the short story is in the singular form, it reveals many encounters: a meeting of an older couple, a spontaneous trip to Italy, an encounter with a refugee girl and a refugee family, the birth of love and its loss.
Midas syndrome (microphthalmia syndrome and linear defects of the skin): case report
Authors: Johane Ostia Garza Patricia , Alvarez Lucero Itzel Moreno , Miranda Elga Cristina Reyes , Roberto Guevara-Yáñez , Aguirre María Esther Blanco
Published: January 2023

.
The usual sedative dose in very elderly patients with a good neurological outcome after cardiac arrest can cause a suppressed background and burst suppression: two case reports
Authors: Lee Jae Hoon
Published: January 2023

Highly malignant electroencephalogram (EEG) patterns (including suppressed background and burst suppression) refer to a poor neurological outcome in cardiac arrest patients, but some of those patients may show a good neurological outcome. This is the first report that details the reason for their uncommon survival despite highly malignant EEG patterns after cardiac arrest. The brain cortical activities in very elderly patients (who are vulnerable to the usual sedative doses) showed a suppressed background and burst suppression but resulting in a good neurological outcome. The mean suppression rates from their EEGs were 100% and 68.4%, respectively, and a normal pattern was completely restored after the sedatives had affected their brain waves for 12 hours. It was speculated that sedatives given at an ordinary dose may negatively affect the brain’s cortical activity in elderly patients who demonstrate a good neurological outcome. When appropriate doses of sedatives are used, highly malignant EEG patterns in very elderly patients should be carefully interpreted for early neuroprognostication.
The role of repeated brain computed tomography based on ultrasound monitoring of optic nerve sheath diameter after moderate traumatic brain injury
Authors: Torabi Mehdi , Mirhosseini Amirsasan , Mirzaee Moghaddameh
Published: January 2023

Objective This study was conducted to evaluate the association between changes in repeated brain computed tomography (CT) findings and the optic nerve sheath diameter (ONSD) determined by ocular ultrasonography in patients with moderate blunt traumatic brain injury (TBI).Methods This cross-sectional study was performed on patients with moderate blunt TBI (Glasgow Coma Scale, 9–12) who were referred to the emergency department during a 1-year period. Initially, all patients underwent a brain CT scan and primary ocular ultrasonography. Patients who were candidates for a second brain CT scan under observation in the emergency department also underwent a second ocular ultrasound. The primary outcome was the progression of brain lesions on repeated brain CT scans. Logistic regression and the area under receiver operating characteristic curve (AUC) were used.Results Overall, 204 patients with a mean age of 43±13.4 years were enrolled in the study. The study detected expanding changes in brain CT scans from 29 patients (14.2%). The progression of lesion on CT scan were significantly associated with changes in the Glasgow Coma Scale. In the second brain CT scan, there were significant associations between the progression of lesion on CT scan and the increased size of the ONSD measured on both axial and coronal sections (odds ratio, 17.3–47.5; AUC, 0.88–0.93).Conclusion Among patients with moderate TBI, an increase in ONSD on ocular ultrasound seems to be an appropriate criterion for repeating a brain CT scan to select a suitable therapeutic intervention.
João presente!
Authors: Silva Dayvesson Deleon Bezerra da , Lira Verônica Maria Brayner de Oliveira , Azevedo Nadia Pereira da Silva Gonçalves de
Published: January 2023

A Análise de Discurso de Linha Francesa (AD), com seu aporte teórico e metodológico, foi o instrumental que nos fez adentrar em possibilidades de significações do discurso de resistência do cantor e compositor Marcelo Mira, na música João. Elaborado há quase duas décadas, o processo discursivo analisado não só refletiu problemas históricos da pobreza no Brasil, mas favoreceu a discussão sobre o aprofundamento da crise nos dias atuais. O diálogo com a exterioridade trouxe para a atualidade modos de significar de dizeres estabilizados, institucionalizados. A criatividade artística, quando aplica metáforas, paráfrases, polissemia, estabelece novas possibilidades de significação. O objetivo principal deste trabalho consiste em analisar o discurso de resistência de um sujeito periférico e negro, que se desenvolveu no âmbito da arte musical e que faz enfrentamento ao discurso dominante atual, balizado pelo neoliberalismo. Para fundamentação da análise, embasamo-nos em Pêcheux e em autoras que são referências, no Brasil, dos estudos da AD, a exemplo de Eni Orlandi e Cristina Leandro Ferreira. Na perspectiva do movimento entre discurso e interdiscurso, contemporizamos as discussões com pressupostos de outras áreas de conhecimento, com ênfase na sociologia, que estão em pleno debate com o paradigma neoliberal. Também, realizamos pesquisa em meios digitais, sites oficiais para obtermos dados recentes e argumentos que circulam no meio virtual sobre questões aqui levantadas. Na materialidade discursiva da música está inscrita uma cronologia de dor e de luta na vida de João, enquanto personagem, que representa, ao mesmo tempo, o assujeitamento e o enfrentamento do discurso que lhe interpelou como sujeito.
Catimbó-Jurema
Authors: Lima Leonardo Adriano Eugênio de , Dias Thayse Silva da Rocha , Rocha Ana Flora Ferreira , Bezerra Fábio Alexandre Silva
Published: January 2023

Na sociedade contemporânea, são inúmeras as demandas criadas cotidianamente decorrentes das relações interseccionais que compõem as experiências identitárias de indivíduos e de grupos sociais diversos, com base em marcadores sociais da diferença como gênero, sexualidade, raça, classe, etnia, afiliação religiosa e deficiência, que frequentemente se tornam catalizadoras de preconceitos e de discriminação. Diante desse contexto, investigamos, neste artigo, a construção do imaginário sociodiscursivo sobre o Catimbó-Jurema por meio da análise de quadros de cenas selecionadas do filme O Auto da Compadecida (2000), com suporte teórico-metodológico e crítico da gramática sistêmico-funcional (HALLIDAY; MATTHIESSEN, 2014), mais especificamente do sistema de transitividade da metafunção experiencial, da gramática do design visual (KRESS; VAN LEEUWEN, 2021), com foco nas metafunções representacional e composicional, e da análise crítica do discurso (FAIRCLOUGH, 1995, 2015; RESENDE; RAMALHO, 2006), com base no modelo tridimensional de Fairclough, em relação transdisciplinar com estudos em antropologia, ciências da religião, sociologia e filosofia. Resultados gerais das análises críticas e sistêmico-funcionais do discurso multimodal sobre o Catimbó-Jurema no filme O Auto da Compadecida apontam que a construção desse imaginário social ocorre por meio da mobilização de recursos verbais e imagéticos que buscam associar religiões afro-indígenas ao demoníaco na intersecção de discursos e práticas sociais que se (re)articulam de formas complexas, históricas e situadas. Por fim, compreendemos que as análises empreendidas nos possibilitaram uma visão crítica não apenas quanto à utilização dos recursos multimodais neste filme, mas também no que diz respeito às inter-relações entre os processos de construção de sentido por meio da linguagem e as inteligibilidades que também são parte do imaginário sociocultural.
Análise de metais e avaliação da citogenotoxicidade da água do Delta do Rio Jacuí, Rio Grande do Sul
Authors: Basso da Silva Luciano , De Souza Barbosa Fogaça Reis Daniele , Da Cunha Morales Davi , Caterina Kapusta Simone , Schmitt de Nonohay Juliana
Published: January 2023

O Delta do Rio Jacuí é impactado por atividades industriais, urbanas e agrícolas. Neste contexto, o objetivo do estudo foi avaliar a presença de metais e a citogenotoxicidade da água em dois pontos do Delta do Jacuí. Amostras de água foram coletadas, em dois períodos diferentes, em dois pontos localizados na Ilha do Pavão. Os metais analisados foram alumínio, cádmio, chumbo, cobre, cromo total, manganês, níquel e zinco. A citogenotoxicidade foi avaliada em células de raízes de Allium cepa, após exposição dos bulbos às amostras de água e ao controle negativo, por 48h. Os metais detectados foram alumínio e cádmio em concentrações acima do limite e zinco em acordo com a legislação. Índice mitótico e frequência de micronúcleos nas células de cebola não apresentaram diferenças significativas entre os tratamentos. Foi observado aumento significativo na frequência de anormalidades cromossômicas nas cebolas expostas a uma das amostras de água. Os resultados sugerem contaminação permanente da água por alumínio, variação temporal para cádmio e variação espacial para zinco, bem como variação espaço-temporal na contaminação genotóxica da água do Delta do Jacuí na região da Ilha do Pavão.
Palavras-chave: Qualidade da água; bioensaios; ecotoxicologia.
Health Misinformation on Social Media and its Impact on COVID-19 Vaccine Inoculation in Jordan
Authors: AL-Jalabneh Abd-Allah
Published: January 2023

It is vital to understand the nature of misinformation disseminated online regarding the COVID-19 vaccination. This understanding will enhance governments’ efforts and strategies to combat the factors which hinder vaccine uptake. Vaccine hesitancy has always been a challenge which has accompanied vaccine rollouts. Misinformation regarding the COVID-19 vaccination, along with the ambiguous narratives around the origin of the virus, has played a role in vaccine hesitancy among Jordanians. The online activity generated by social media during the pandemic, due to people’s fear of the virus, their general anxiety and curiosity, and their desire for updates, made social media an even more fertile environment for misinformation than ever before. During the COVID-19 pandemic in Jordan, misinformation on social media platforms amplified the scale of fears around the safety of the vaccination programme. Therefore, this study offers an exploration of, and insight into, the thoughts and experiences of a sample of 30 Jordanian citizens who are hesitant about COVID-19 vaccination. This study uses a qualitative approach in order to further understand vaccine hesitancy and the nature of misinformation surrounding it, using semi-structured, face-to-face interviews with participants. It found that low levels of information about health, misconceptions about the COVID-19 vaccine, and the spread of misinformation on social media were all causes of vaccine hesitancy in Jordan. Facebook and WhatsApp were the principal social media networks identified in this study as spreading misinformation about the vaccine. The study sample reported that they believed in the conspiracy theories discussed on these two platforms. Furthermore, videos of influencers and anti-vaccination medical doctors from overseas played a part in misleading individuals regarding inoculation against COVID-19. Additionally, other factors were also identified and are discussed in this study.
Training data journalists. An analysis of postgraduate programs in Spanish universities and the degrees of professionals
Authors: López-López Pilar-José , Arias-Robles Félix , Abellán-Mancheño Andrea
Published: January 2023

This article takes a closer look at the training of data journalists by examining in detail the postgraduate courses offered in Spanish universities. The starting point is a systematic compilation of the official degrees in this field that can be found in the databases of the Spanish Ministry of Universities, as well as a comparative analysis of the existing degrees for two academic years (2020/2021 and 2022/2023). This quantitative study is complemented by a survey of Spanish-speaking data journalism professionals about their training. The goal of this research is to shed light on current training in this discipline, which is one of the most promising for the future of journalism. The findings reflect an emerging but still evolving educational landscape consisting of fourteen specialised data journalism degree programmes, all of which will be offered as postgraduate programmes in the 2022/2023 academic year. These postgraduate programmes are primarily internal and offered by private universities. However, our survey of professionals showed that only 7% of communication specialists have training in this journalistic field. Consequently, Spain is one of the countries where data journalism has not yet fully taken hold in newsrooms due to a lack of adequate training and appropriately trained professionals.
Design and analysis of a novel stator oil-flooded cooling system for aircraft electrical machines with hairpin windings
Authors:   , Paredes Jesús
Published: January 2023

Growing environmental and economic concerns are driving various sectors to improve energy efficiency. In sectors such as aeronautics, this is achieved through electrification and weight reduction, which necessarily involves replacing conventional pneumatic, mechanical and hydraulic systems with electric drives. In addition, electric machines also offer better efficiency and require less maintenance. Then minimizing the weight of electric machines is therefore essential to reduce fuel consumption and permanent magnet machines offer the highest power density. The use of hairpin windings can help reduce weight, due to their high slot filling factor and short winding ends, and have already demonstrated their potential in sectors such as automotive. Another key factor in improving power density are cooling systems. Among all the liquid cooling systems, stator oil-flooded solutions are the most promising, both for their cooling capacity and for the improved electrical isolation between conductors that make them suitable for aeronautical applications. This dissertation deals with the combination of these two aspects, hairpin winding and flooded stator cooling for aircraft applications, and presents a novel cooling system that has been patented. For this purpose, the proposed solution is described and the advantages of this cooling arrangement are detailed. The equations defining its behavior are presented, its potential is experimentally evaluated by using a motorette and design criteria are provided. Subsequently, the presented concept is applied on an industrialized and field-tested machine for heavy-duty off-road vehicles in substitution of a water-jacket cooling arrangement, ending with a prototype in order to assess gains in power density. Next, the novel cooling arrangement is applied on a conceptual design for an aeronautical application. Finally, the main results of this dissertation are summarized and the main future research lines are outlined.
ESTIMATION OF GAS-DYNAMIC PARAMETERS AT THE EXIT OF THE IMPELLER DURING MODERNIZATION OF MI-2MSB FAN INSTALLATION
Authors: Tatarchuk T. , Kravchuk Yu. , Pelukh V.
Published: January 2023

Purpose. Analysis of methods to increase the efficiency of the cooling system of theAI-450M engine units of the Mi-2MSB helicopter and evaluation of gas-dynamic parameters at the impeller outlet, fan installation MI-2MSB
Research methods: finite element method (FEM).
Results. It was shown that the use of a centrifugal fan as the main element in the system of air injection, cabin air conditioning and cooling systems and engine units provide the following opportunities and improvements:
- at constant speeds and without changes in the transmission system to increase the amount of running air by 200…300 %;
 - reduce the temperature of heated units to the values recommended by the operation manual;
- to increase the service life of complex-loaded elements of the system of connection of free turbine shafts with the shaft of the main gearbox;
 - reduce the risk of accidents due to poor air conditioning in the cockpit and passenger seats.
The analysis of possible types of C.S modernization was carried out, the estimated estimation of gas-dynamic parameters at the exit of the impeller - to the sub-radiator space was carried out. The problem was solved by changing the type of impeller from axial to centrifugal.
Scientific novelty. The problem of creating an efficient and reliable cooling system for internal systems and units of the Mi-2MSB light multi-purpose aircraft, which has been modernized with the replacement of old GTD-350 engines with newer ones, AI-450 series - urgent, in the absence of similar light helicopters of domestic production. An important component of the safety and reliability of all components of the helicopter is to maintain the correct thermal regime of its components.
Practical value. The obtained results are important in the further process of production and modernization of the Mi-2 helicopter of all modifications with the latest engines, as well as for helicopter development projects in Ukraine - SME-2 “Hope”, SME-6 “Otaman”, SME-8 and others. The ability to increase cooling efficiency, air conditioning and reduce engine load increases the life, reliability of components and improves comfort and performance for pilots and passengers.
DETERMINATION OF ENERGY PARAMETERS OF Ni+Al2O3 POWDER PARTICLES IN A SUPERSONIC NOZZLE DURING COLD GAS-DYNAMIC SPRAYING USING THE ANALYTICAL METHOD
Authors: Shorinov О. , Polyvianyi S.
Published: January 2023

Purpose. To calculate the temperature and velocity of nickel and aluminum oxide particles in the supersonic flow in the low-pressure cold gas-dynamic spraying nozzle. To investigate the effect of gas parameters at the nozzle inlet, in particular temperature and pressure, on the velocity and temperature of particles at the nozzle outlet.

Research methods. The calculation of the temperature-velocity characteristics of the powder particles is performed after determining the parameters of the gas flow in the supersonic nozzle channel using well known gas-dynamic dependencies. The initial data for the calculation are the following: the geometry of the nozzle, the temperature and pressure of the gas (air) at the nozzle inlet. The density of the material from which particles are obtained, as well as their diameter, were taken into account in the calculation of the energy parameters. Nickel particles with a diameter of 25 µm and aluminum oxide particles with a diameter of 22 µm were used.

Results. Based on the calculations results, graphs of changes in the velocities and temperatures of the particles of the investigated powders, as well as working gas, in the channel of the low-pressure cold gas-dynamic spraying supersonic nozzle were developed. The dependences of the temperature-velocity parameters of the particles at the nozzle exit in the range of initial values of temperature at the nozzle inlet from 300 to 600 C° and pressure from 0.6 to 1.0 MPa were also developed.

Scientific novelty. The influence of the initial parameters of the gas at the nozzle inlet in a wide range of values on the temperature and velocity of nickel and aluminum oxide particles during the low-pressure cold gas-dynamic spraying is shown.

Practical value. The obtained results can be used to determine rational spraying parameters in the development of technological processes of deposition of protective and restorative coatings from Ni+Al2O3 powder mixture.
INFLUENCE OF THE CHEMICAL COMPOSITION OF HIGH-CHROMIUM CAST IRON ON THE CONTENT OF CHROMIUM IN NEAR-CARBIDE ZONES AFTER ANNEALING AT 720 °С
Authors: Netrebko V.
Published: January 2023

Purpose. Increasing the corrosion resistance of wear-resistant high-chromium materials operating in a liquid abrasive environment makes it possible to increase the service life of products made from these materials, which is an important task in materials science. One of the main reasons for the occurrence of damage during corrosion processes is the uneven distribution of chromium in the metal base, which leads to the formation of microgalvanic pairs on the surfaces of parts in an electrolytic environment. The creation alloys of wear-resistant high-chromium, in the metal base of which microgalvanic vapors are not formed, is a promising direction for increasing the corrosion resistance of such materials. Investigation of chromium distribution processes after heat treatment parts of high-chromium cast iron, namely the formation of metal base zones near carbides.

Research methods. Analytical review of publications. Metallographic, microstructural and local X-ray microanalysis. Mathematical modeling of processes.

Results. It was revealed that during the heat treatment in high-chromium cast irons, structures with significant segregation of chromium are formed. It has been established that after annealing of castings at 720 °C, the minimum chromium content in the metal base is observed in the zones near carbides, and the maximum in the central zones of the graids. The presence zones with a chromium content of more than 12 % (positive potential) and less than 12 % (negative potential) leads to the formation of microgalvanic couples, which is the main reason for the acceleration of corrosion damage in the metal base. The dependence of the chromium content in the zones near the carbides after annealing at 720 °C on the chemical composition of cast iron has been determined.

Scientific novelty. The mathematical model is proposed for determining the chromium content in the zones near carbides after annealing at 720 °C with an exposure of 9 hours from the chemical composition of cast iron in the Fe-C-Cr-Mn-Ni system. This makes it possible to predict the chromium content in the zones near the carbides and prevent the formation of microgalvanic pairs.

Practical value. The dependence (mathematical model) obtained can be used in the development of compositions of high-chromium wear-resistant cast irons with increased corrosion resistance and machinability.
ON THE INTERACTION OF ALLOYING ELEMENTS WITH GRAIN BOUNDARIES OF HIGH-PURITY NICKEL AND IRON
Authors: Ol’shanetskii V. , Stepanova L. , Kononenko Yu. , Skrebtsov А.
Published: January 2023

Purpose. Proof of the reality of the effect of displacement of some microadditives from the internal boundaries of the grains into their internal volumes for reasons of purely thermodynamic concepts.

Research methods. The initial data were specially selected chemical compositions of model alloys based on high-purity nickel and iron, which are microalloyed with yttrium, lanthanum, zirconium and rhenium. The choice of nickel and iron as the basis for the alloys under study is due to the fact that they are the base for a large group of industrial alloys (heat-resistant nickel materials and a wide range of steels for various purposes).

The lattice parameters of nickel and iron were determined using an improved DRON-1 type diffractometer in copper (nickel alloys) and iron (iron alloys) X-ray radiation with monochromatization of diffracted beams. The lattice parameters were determined, respectively, using the (420)a and (220)a lines, respectively, for nickel and iron alloys.

Results. During recrystallization, migrating grain boundaries in nickel and iron retain impurity atoms and still partially “sweep” them out of the grain volume. The thickening of the boundary zones (that is, their "loosening") prevents the possibility of supersaturation of the interfaces with microalloying impurities.

The effect of significant displacement of some microalloying elements (zirconium and rhenium) deep into the grains of the matrix phases (nickel and iron) has been established.

It has been found that such microalloying elements as lanthanum (cerium) and yttrium have the most effective influence on the strength characteristics of the studied metallic materials.

Scientific novelty. Graphs of changes in the chemical composition of microalloyed basic solutions (nickel and iron) are plotted while maintaining the fine structure of grain boundaries. If they are loosened, this crowding out effect disappears.

Practical value.  Since the effect of microalloying (as shown in the presented works) significantly affects the strength characteristics of materials, the results of the study showed which of the selected microalloying elements act most effectively in this direction.
RELATION BETWEEN DISCONTINUOUS PLASTIC FLOW AND STRAIN HARDENING OF THE LOW-CARBON STEEL
Authors: Vakulenko I. , Plitchenko S. , Bolotova D. , Perkov O.
Published: January 2023

Purpose. Determination of the conditions for the disappearance of a section of intermittent flow and its effect on the strain hardening of low-carbon steel.

Actuality. The use of low carbon steels with intermittent flow for stamping has a significant limitation. Based on this, the issues of the effect of ferrite grain size on the occurrence of intermittent flow are relevant for determining the optimal structural state of steels intended for deep drawing.

Research methods. The structure of the samples was studied under a light microscope, the grain size of the ferrite was determined by the methods of quantitative metallography. The mechanical properties of steel were determined in tension at room temperature and a strain rate of 10-3 s-1. The characteristics of the initiation of plastic flow and the parameters of strain hardening were determined from the analysis of tension curves in logarithmic coordinates. In the region of uniform strain hardening, the deformation of the violation of the directly proportional relation lgσ-lgε was determined as the moment of formation of dislocation structures with a certain periodicity.

Results. An increase in the grain size of ferrite is accompanied by a decrease in the region of intermittent flow and a shift in the moment of formation of a dislocation cellular structure towards small plastic deformations. The strain hardening rate in the region of uniform work hardening and the Lüders strain are related by an inversely proportional relationship. With excessively large grain sizes of ferrite, the difficulty of maintaining conditions for a uniform distribution of slip lines is one of the reasons for the disappearance of the intermittent flow region on the deformation curves of low-carbon steel.

Scientific novelty. With an increase in the grain size of ferrite, the deformation of the beginning of the decay of a uniform distribution of dislocations into periodic structures is shifted to a decrease. At the same time, an increase in the ability of the metal to work hardening during the formation of a deformation band contributes to a decrease in the length of the intermittent flow section.

Practical value. Determining the nature of the influence of the grain size of low-carbon steel ferrite on the characteristics of work hardening and the formation of dislocation periodic structures can be useful in determining the optimal structural state of steel for deep drawing.