bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Number Line Approach on Learning Fractions: A Case of Basic Six Learners in the Cape Coast Metropolis
Authors: Sarpong Maxwell Adu , Ntow Forster Danso
Published: June 2023

While the number line approach is successful for fractional learning, there is a dearth of study on its usage in Ghanaian upper primary schools. The study explored the influence of the number line approach on learning fractions. Learners’ achievements, attitudes, and learner’s challenges when using the number line were explored. A quantitative research method embedded with a pretest-posttest non-equivalent design was used. The Fractions Achievement Test (FAT) and a structured questionnaire were the instruments used for data collection. Eighty-one basic six learners with two intact classes (39 in control and 42 experimental groups) were purposively selected within the Cape Coast Metropolis. The experimental group was exposed to learning fractions using the number line, while, in the control group, fraction lessons were carried out through the use of set models. An independent sample t-test was employed to analyse the differences between the pre-test and post-test of the control and experimental group. The findings revealed that there was a significant difference in performance between the post-test scores for the control group (M=7.36, SD=1.78) and the experimental group (M=9.21, SD=2.83); t(69.77)= -3.55; p=0.001 respectively. This implies that the experimental group outperformed the control group due to the influence of the number line approach. Learners in the experimental group had better, understanding, application, and positive attitude toward learning fractions due to the use of number line. Finally, learners however had some challenges, such as the inability to recognise that zero is part of the number system, poor estimation, and counting the tick lines on the number line instead of the intervals between them.
Multifractal Detrended Cross-Correlation Analysis: The case of Brazilian Bioethanol time series
Authors: Fernandes Leonardo HS , Silva José WL , de Araujo Fernando Henrique Antunes , Tabak Benjamin M
Published: June 2023

We have examined the nonlinear cross-correlation between the São Paulo time series of the weekly price of Bioethanol and the other 14 Brazilian capitals’ time series of the weekly price of the same biofuel using the Multifractal Detrended Cross-Correlation Analysis (MFDCCA). We provide evidence of multifractal correlation properties across these prices. We implement our method using both prices and returns and show some divergence between results. We recommend using price time series when using MF-DCCA.
Revisiting post-ICU admission fluid balance across pediatric sepsis mortality risk strata: A secondary analyses from a prospective observational cohort study.
Authors: Atreya Mihir R. , Cvijanovich Natalie Z. , Fitzgerald Julie C. , Weiss Scott L. , Bigham Michael T. , Jain Parag N. , Abulebda Kamal , Lutfi Riad , Nowak Jeffrey , Thomas Neal J. , Baines Torrey , Quasney Michael , Haileselassie Bereketeab , Sahay Rashmi , Zhang Bin , Alder Matthew , Stanski Natalja , Goldstein Stuart
Published: June 2023

Introduction: Post-ICU admission cumulative positive fluid balance (PFB) is associated with increased mortality among critically ill patients. We sought to test whether this risk varied across biomarker-based risk strata upon adjusting for illness severity, presence of severe acute kidney injury (AKI), and use of renal replacement therapy (CRRT) in pediatric septic shock. Design: Ongoing multi-center prospective observational cohort. Setting: Thirteen pediatric ICUs in the United States (2003–2023). Patients: Six hundred and eighty-one children with septic shock. Interventions: None. Measurements and Main Results: Cumulative percent positive fluid balance between day 1–7 (Day 1–7%PFB) was determined. Primary outcome of interest was complicated course defined as death or persistence of ≥ 2 organ dysfunctions by day 7. PERSEVERE-II biomarkers were used to assign mortality probability and categorize patients into high (n = 91), intermediate (n = 134), and low (n = 456) mortality risk strata. Cox proportional hazard regression models with adjustment for PERSEVERE-II mortality probability, presence of sepsis associated acute kidney injury (SA-AKI) on Day 3, and any use of CRRT, demonstrated that time-dependent variable Day 1–7%PFB was independently associated with increased hazard of complicated course in the cohort. Risk stratified analyses revealed that each 10% increase in Day 1–7%PFB was independently associated with increased hazard of complicated course among patients with high mortality risk strata (adj HR of 1.24 (95%CI: 1.08–1.42), p = 0.002), but not among those categorized as intermediate- or low- mortality risk. Conclusions: Our data demonstrate the independent influence of cumulative %PFB on the risk of complicated course. Contrary to our previous report, this risk was largely driven by patients categorized as having a high-mortality risk based on PERSEVERE-II biomarkers. Further research is necessary to determine whether this subset of patients may benefit from targeted deployment of restrictive fluid management or early initiation of de-escalation therapies upon resolution of shock.
Compliance mit den Regeln der Händehygiene im Rettungsdienst
Authors:   , Guckes Hannah
Published: June 2023

Hintergrund: Der Rettungsdienst versorgt täglich viele Patient/-innen in unterschiedlichen Umgebungen und ist damit auch potentieller Überträger nosokomialer Infektionen. Zur Händehygiene, als entscheidende Säule der Infektionsprophylaxe, liegen bislang nur wenige Daten aus dem Rettungsdienst vor. Methoden: Prospektive multizentrische Studie mit Fragebogen zur Selbst- und Fremdeinschätzung der Compliance und beeinflussender Faktoren (abgeleitet von der WHO Perception Survey for Health-Care Workers) sowie direkte Compliance-Beobachtung nach WHO-Standard bei Rettungsdienstpersonal zweier Berufsfeuerwehren in Deutschland. Ergebnisse: Es wurden 207 Fragebögen eingereicht und während ca. 66h Beobachtungszeit wurden 674 Händedesinfektionsgelegenheiten protokolliert. Der präventive Effekt der HH wurde allgemein von den Mitarbeitenden anerkannt. Die Selbsteinschätzung (MW: 80%) und beobachtete Compliance-Rate (38%) zeigten eine deutliche Diskrepanz und die Compliance variierte zwischen den verschiedenen Indikationen. Besonders niedrig zeigte sich die Compliance rund um die Durchführung aseptischer Tätigkeiten. Hier zeichnete sich ein geringes Risikobewusstsein für nicht sichtbare Verunreinigungen ab. Hürden für die Umsetzung der Händehygiene stellten vor allem die Vorrangigkeit anderer Maßnahmen, Unterbrechung des Arbeitsablaufes und Zeitmangel dar. Schlussfolgerungen: Die beobachtete Compliance-Rate im Rettungsdienst lag unterhalb der innerklinischen Durchschnittswerte. Insbesondere die Compliance im Rahmen aseptischer Tätigkeiten muss dringend gesteigert werden. Dies erfordert einen multimodalen Lösungsansatz, der die Optimierung der Ausbildung, Algorithmen, Materialverfügbarkeit und Praktikabilität der Händedesinfektion im Rettungsdienst beinhaltet.
Corporate social responsibility and corporate tax aggressiveness: Evidence of mandatory vs. voluntary regulatory regimes impact
Authors: Pasko Oleh , Zhang Li , Oriekhova Alvina , Hordiyenko Mykola , Tkal Yarmila
Published: June 2023

This study aims to investigate whether corporate social responsibility activities are associated with more or less tax avoidance by focusing on this interrelationship in mandatory vs. voluntary regulatory regimes. The sample includes 6,668 firm-year observations of Chinese A-share firms listed on the Shanghai and Shenzhen stock exchanges over 2011–2019. The study uses corporate culture and risk management theories to develop the hypotheses. Regression analysis and various robustness tests are employed to test the hypotheses. The data are retrieved from the HEXUN CSR system and CSMAR and WIND databases. Consistent with the predictions of corporate culture theory, which argues that aggressive tax avoidance cannot be synchronously coupled with corporate social responsibility, the paper finds that notwithstanding regulatory regime, when the level of corporate social responsibility increases, the level of tax aggressiveness decreases. Thus, the results show that firms reporting corporate social responsibility tend to be less tax aggressive. Firms that engage in more corporate social responsibility activities are less likely to be tax aggressive, irrespective of regulatory regimes in place. Moreover, pollution indicators have little effect on corporate social responsibility and tax aggressiveness in Chinese institutional settings. The study contributes to the business ethics literature by implying the role of tax avoidance as a part of CSR and not as a separate non-CSR element of companies’ activities.
AcknowledgmentThis paper is co-funded by the European Union through the European Education and Culture Executive Agency (EACEA) within the project “Embracing EU corporate social responsibility: challenges and opportunities of business-society bonds transformation in Ukraine” – 101094100 – EECORE – ERASMUS-JMO-2022-HEI-TCH-RSCH-UA-IBA/ERASMUS-JMO-2022-HEI-TCHRSCH https://eecore.snau.edu.ua/
An assessment of demographic variables affecting employees’ organizational commitment in India’s thermal power sector
Authors: Rampal Sheetal , Arora Nitin , Nawaz Nishad , Kumar Gupta Sandeep , Kapoor Shikha
Published: June 2023

This study aims to analyze the impact of three demographic variables (gender, age, and work experience) on the commitment levels of employees in the Indian thermal power sector. 379 responses were collected through convenience sampling from the executives of NTPC Ltd, a major power utility in India. The facets of organizational commitment (affective commitment, normative commitment, and continuance commitment) were assessed using a standard scale. The quantitative research was done using statistical instruments of one-way ANOVA and independent sample t-test. The findings revealed a positive correlation between the three components of organizational commitment: affective, continuance, and normative. Further, the results highlighted that age plays an essential role in organizational commitment levels; it is found that commitment increases with the age of employees (F = 5.781, p < 0.01). However, gender is not making any variation in organizational commitment (F = –0.502, p < 0.01). Therefore, male and female employees enjoy equal commitment levels toward their work. The study further indicated that work experience significantly influences organizational commitment (F = 4.800, p < 0.01), and it is found to be greater for more experienced employees.
Prospects of provision of radiation safety from natural sources of ionizing exposure on the new territories of the Russian Federation
Authors: Kalaydo A. V. , Kormanovskaya T. A.
Published: June 2023

This study is aimed at the analysis of perspectives of provision of radiation safety from natural sources of ionizing exposure on the territories included into the Russian Federation in 2022. The study contains comparison of the requirements of legislative acts and regulations on the radiation safety that were active in 4 new subjects of the Russian Federation (Donetsk and Lugansk republics, Zaporozhye and Kherson regions) on the time of their integration with their Russian equivalents. The results indicate the lack of harmonization between acting radiation safety sanitary acts of the Russian Federation and the Ukraine with recommendations of the international organizations. The study contains results of the surveys on the exposure of the public of the Donbass republics and Zoporozhye region by natural sources of ionizing exposure, analysis of the perspectives of the provision of radiation safety of the public of these regions and the Kherson region. Additionally the study includes the evaluation of the existing legislative base on the protection from natural sources of ionizing exposure in the Russian Federation and perspectives of harmonization with the recommendations of international organizations.
The uncertainty of estimation of doses to the bone marrow from 89,90Sr due to the variability of the chemical composition and bone density
Authors: Shishkina E. A. , Sharagin P. A. , Tolstykh E. A.
Published: June 2023

Dosimetric modeling of radiation transport in skeletal bone tissues using computational phantoms provides the doses of internal exposure to active marrow. Computational phantoms of ICRP are created for reference people with anatomical and physiological characteristics typical of an average individual. The doses calculated with such phantoms will correspond to certain population-average values. Individual variability will introduce a stochastic component of uncertainty into the dose estimation. The objective of this study is to assess the influence of variability of chemical composition and bone density on the results of dosimetric modeling. The phantoms are represented by simple geometry figures filled with trabecular structures and bone marrow and covered with a cortical layer. Radiation transport was simulated using the Monte Carlo method. The dose factors to convert the radionuclide activity concentration to absorbed dose rates in active marrow were calculated assuming uniform radionuclide distribution in the volume of the trabecular and cortical bone. As a result of the numerical experiments, it has been shown that variations in chemical composition do not introduce an error of more than ± 4% into dosimetric modeling. The effect of bone density on active marrow dose formation depends on the size of a phantom. For computational phantoms with linear dimensions exceeding two electron free path lengths (~ 0.44 cm), variability of bone density within ± 3% leads to a similar relative uncertainty of the dose conversion factor. However, for smaller phantoms, bone density variability leads to uncertainties of 6% or 13% for a source deposited in the trabecular or cortical bone, respectively. The results obtained will be used to assess the uncertainty of bone marrow dosimetry, taking into account the uncertainty of all parameters including the variability of morphometric characteristics of bones, the variability of the active marrow distribution in skeletal sites, as well as the uncertainties introduced by model approximations.
Seramik Eserlerde Koruma ve Sergileme Süreci
Authors: Çevik Derya , Bilen Yusuf
Published: June 2023

Seramik, insanlık tarihinin en eski ve önemli kültürel hazinelerini içinde barındırdığı bilinmektedir. Sanatın ilk çağlarından günümüze kadar uzanan en eski el sanatlarındandır. Seramik buluntular sayesinde kronolojik bir sıralama yapılabilmektedir. Bu sıralama o dönemin kültürel buluntularını, kullanılan araç ve gereçlerin hangi ihtiyaçlar doğrultusunda ortaya çıktığını ve bunların kullanım amaçları hakkında bize bilgi vermektedir. Seramik eserlerin korunması nesiller boyunca devamlılığın sağlanması ve kültürümüzü anlamımız açısından önem arz etmektedir. Bundan dolayı seramik objelerin ilk olarak sınıflandırılması, bozulma nedenleri ve bütünlüğünün korunması için etkin ve önleyici koruma çalışmalarının yapılması gerekmektedir. Bu çalışma doğrultusunda bir seramik eserin müzeye gelmeden önce uygulanacak aşamaları, müzedeki eserlerin korunma süreci, seramiğin vitrinde sergilenmeden önce uygulanması gereken yöntemleri ve pasif koruma yöntemleri ele alınmaktadır. Amacımız “seramik eserlerin korunması ve sergileme yöntemleri”nin kültürel mirasa katmış olduğu bilgi, tecrübe ve temel ilkelerin araştırılmasıdır. Ayrıca taşınabilir kültürel mirasın disiplinler arası anlayışla birlikte gelişen teknolojinin seramik koruma ve sergilemenin müzelere nasıl bir katkısı olduğu ve sürdürülebilirliği konusunda ilerlememektedir. Müzelerdeki sergilemeyi ziyaretçilere daha iyi bir şekilde göstermek için web tasarımı uygulamasını kullanmak etkili bir iletişimi sağlamaktadır. Seramik eserlerin korunması ve sergilenmesi, diğer alanlar arasındaki bilinçlenmeyle birlikte kültür paylaşımını da katkısı olacaktır.
El negocio de la publicación científica, el obituario de las revistas de países en desarrollo
Authors: Ruiz Buitago Jhon Didier
Published: June 2023

Desde hace muchos años, “tal vez más de los que quisiera”, me adentré en el mundo la investigación científica, la formación en ciencia y los métodos para desarrollarla. En el proceso, me fui dando cuenta de la importancia de la comunicación científica como una forma para la apropiación social del conocimiento: deseaba entregar el mío y ponerlo al servicio de los demás.
La publicación de artículos científicos o los llamados “papers” sobresale por encima de la comunicación que se hace a través de congresos, seminarios, pósteres, entre otras, como la forma más anhelada por los académicos para mostrar sus resultados, lograrlo se convierte en un hito personal llegando al punto de volverse casi la única manera de ganar reconocimiento en los círculos científicos, hecho que se pone en evidencia con la frase dogmática: “Publish or Perish” (“Publicar o morir”), que resalta la importancia que tiene la publicación científica para todo investigador (Tudela & Aznar) (5).
Cyberbullying, Personalidade e Sintomatologia Psicopatológica em Adolescentes e Jovens Adultos
Authors: Portilho Carvalho Teresa , Monteiro Fernandes Otília , Carvalho Relva Inês Moura de Sousa
Published: June 2023

O cyberbullying parece ter impacto sobre a saúde mental, das vítimas e dos agressores. O presente estudo teve como objetivo analisar a relação entre as duas formas de cyberbullying: vitimização (medido através do Cybervictimization Questionnaire - CYVIC) e a agressão (medido através do Cyber-aggression Questionnaire- CYBA), traços de personalidade (medidos através do Ten Item Personality Inventory- TIPI) e sintomatologia psicopatológica (medida através do Brief Symptom Inventory- BSI). A amostra foi constituída por 553 adolescentes e jovens adultos, com idades compreendidas entre os 17 e os 30 anos. Os resultados sugerem que 59.7% (n= 330) dos participantes foram alvos de pelo menos um comportamento de cyberbullying e 21.0% (n= 116) praticaram pelo menos um comportamento. Por último, verificou-se um efeito preditor positivo das dimensões psicoticismo, sensibilidade interpessoal, somatização e ideação paranoide sobre a cibervitimização, assim como um efeito preditor negativo da dimensão extroversão e positivo da dimensão amabilidade sobre a ciberagressão. Destaca-se a necessidade de trabalhar sobre a prevenção destes comportamentos, tendo em consideração os impactos que estes têm sobre a saúde mental, devendo a investigação, a prevenção e a intervenção focar-se em estudar e trabalhar com todos os intervenientes destes comportamentos.
Inactividad física en docentes de una facultad de salud
Authors: Garces Pareja Maicol , Lezcano Aguirre Cinthya , Hernández García Karol Vanessa , Muñoz Rodríguez Diana Isabel
Published: June 2023

La actividad física es una práctica efectiva para cuidar la salud física y mental de la población en general. Sin embargo, la población tiene bajos niveles de actividad física. Una población particular es la de docentes universitarios quienes, por las necesidades de las instituciones y de los estudiantes, invierten en ocasiones tiempo adicional en su descanso, ejecutando actividad laboral, lo que resulta en una diversidad de actividades de bajo gasto energético. Objetivo: estimar la prevalencia de inactividad física de un grupo de docentes universitarios de una facultad de salud, y explorar si los factores laborales se asocian a esta conducta. Métodos: estudio cuantitativo observacional con enfoque descriptivo y de intención analítica, donde se contó con la participación de 34 docentes de una facultad del área de la salud laboralmente vinculados en el año 2021. La variable dependiente fue la inactividad física, medida por acelerometría; se indagó por las características sociodemográficas, antropométricas, laborales y de hábitos de vida. El análisis se condujo a través de medidas descriptivas, pruebas de hipótesis y razones de prevalencia crudas. Resultados: se encontró que cuatro de cada diez docentes son físicamente inactivos; aunque las características laborales, no se mostraron asociadas, algunas características sugieren una mayor proporción de docentes inactivos. Conclusión: la realización de actividad física en los docentes no es suficiente para dar cumplimiento con los niveles mínimos recomendados para proteger la salud; aunque los factores de la jornada laboral no parecen estar asociados quizá por la homogeneidad de características de este grupo particular, es importante que, desde los sistemas de bienestar institucional, se brinden estrategias y espacios que orienten sus acciones hacia la promoción de conductas saludables que mejoren la salud de sus docentes.
Inmunoepidemiología y epidemiología crítica
Authors: González Marcial Luis Francisco
Published: June 2023

El presente trabajo surge como un ejercicio académico de la experiencia educativa “Epidemiologia Crítica” del posgrado Maestría en Salud Pública de la Universidad Veracruzana, se pretende realizar un análisis crítico sobre el trabajo de tesis realizado durante la estancia en la misma. La vacunación es una de las estrategias preventivas más efectivas en salud pública. Vacunar, implica prevenir enfermedades y contagios a través de la activación del sistema inmune adaptativo, tras la generación de anticuerpos neutralizantes y células especializadas. Visto desde el punto de vista comunitario, se genera una inmunidad protectora conocida como inmunidad poblacional, la cual reduce las probabilidades de contagio. Evaluar la campaña de vacunación contra el SARS-CoV-2 es imprescindible, es evidente que es imposible dejar de lado los datos generados por la epidemiologia clásica como los indicadores de incidencia o riesgo relativo; no obstante, incorporar estrategias de evaluación como la inmunoepidemiología, que de igual forma generan conocimiento directo sobre la efectividad de la vacuna abonarían aún más a las miradas simplistas prevalecientes en la epidemiologia. Sin embargo, este tipo de abordaje sigue siendo insuficiente, es necesario evaluar la campaña de vacunación desde la mirada crítica de la epidemiologia, cuestionar las decisiones tomadas y ser conscientes que se está a tiempo de realizar estudios de seroprevalencia de anticuerpos contra el virus tomando en cuenta los determinantes sociales de la salud de la población mexicana, buscando una autodeterminación sin esperar los resultados que pudieran generar los países del norte global.
Assessment of groundwater and surface water quality in a typical mining community: application of water quality indices and hierarchical cluster analyses
Authors: Anang Emmanuella , Tei Meshack , Antwi Anthony Boakye , Aduboffour Victor Kwabena , Anang Benjamin
Published: June 2023

The rate at which freshwater sources are being contaminated by mining operations in the South-Western part of Ghana is alarming. However, no study has quantified the degree of contamination of the freshwater in such areas, leaving a gap in the literature that requires immediate attention. This study assessed the quality of the surface and groundwater in the Tarkwa Nsuaem Municipality. Even though the physical parameters such as pH and electrical conductivity were indicative of safe freshwater, other parameters such as turbidity, total suspended solids (TSS), dissolved oxygen (DO), and heavy metals in the water sources were high; thus, confirming possible leaching, runoff, and dissolution of the hazardous substances employed in the manganese mining operations. The water quality of 82% of the water sources along the Kawere Stream was low (Classes III and IV). Therefore, the local people are at risk of contracting water-related diseases, and health problems associated with the ingestion of Fe, As, and Mn. The findings in this study are important in establishing the rate at which mining operations are reducing the quality of freshwater in developing countries, and potentially affecting human health.
Znaczenie zwrotu „humano modo” w kan. 1061 § 1 KPK/83
Authors: Dzierżon Ginter
Published: June 2023

W prezentowanym artykule przedmiotem uwagi Autora stał się desygnat zwrotu normatywnego humano modo, występującego w kan. 1061 § 1 Kodeksu prawa kanonicznego z 1983 roku. Autor jest zdania, że znaczenia tego zwrotu nie można zrozu- mieć bez uwzględnienia szerszego kontekstu związanego z jednej strony z ewoluującym postrzeganiem aktu małżeńskiego w kanonistyce, a z drugiej strony z założeniami teorii czynności prawnej. Wykazał, że skonsumowanie małżeństwa ma charakter dwustronnej czynności prawnej. Jego zdaniem znaczenie zwrotu humano modo pozostaje w ścisłym związku z personalistyczną wizją aktu małżeńskiego, związaną z kategorią aktu ludz- kiego (actus humanus). Wyraził pogląd, że zastosowanie założeń teorii aktu prawnego na temat jego wad (przemoc, bojaźń, złośliwość) stało się impulsem do głębszej refleksji doktryny nad zagadnieniem pożycia małżeńskiego w kanonicznym porządku prawnym.
Integration of HF and SPF technology in an efficient industrial production flow for high rates aeronautical parts
Authors: Marcel Y.
Published: June 2023

Abstract. The presentation will illustrate the creation and production ramp-up of the Titanium Hot Forming and Superplastic Forming Technology in a French aeronautical supplier from Industrialization to A320NEO full-rate production. With deformation and elongations well beyond classical « cold » sheet metal forming capabilities (especially with high-strength titanium alloys such as Ti64 and refractory Ti6242), Hot Forming and Superplastic Forming were key assets to be complementary to other standard manufacturing methods already used in the factories of the LAUAK group. Several aspects of the project will be presented, including the installation of HF/SPF workshop and presses, the industrialization steps of Airbus A320NEO pylon parts from tooling design to the qualification, and then integration of the HF & SPF in the full logistics flow of the factory production lines (from the material, blanks, forming, 5-axis laser trimming and machining, control and finally assembly). Some of the industrial challenges faced and overcame will be highlighted and illustrated.
Study on superplastic gas-bulging properties and microstructure evolution of as-rolled 2A97 Al-Li alloy
Authors: Zhang Y.
Published: June 2023

Abstract. In this paper, the forming properties of as-rolled 2A97 Al-Li alloy at 370 ~430 ℃ and 0.02~0.08 MPa/min were studied by Superplastic gas-bulging experiment, the microstructure and mechanical properties of 2A97 Al-Li alloy after deformation were evaluated and analysed by means of EBSD, TEM and other testing methods. The results show that the as-rolled 2A97 Al-Li alloy has good superplastic deformation ability, the optimum forming parameters are 390℃, 0.06 MPa/min, and the maximum height of cap cone is 74 mm under these conditions. Dynamic recry -stallization of rolled microstructure occurs during superplastic deformation, the microstructure after superplastic deformation is fine, equiaxed and the average grain size is less than 5 μm. The material keeps good strength and plasticity after superplastic deformation, the tensile fracture shows obvious ductile fracture characteristics, and there are a lot of dimples with regular shape and uniform distribution on the fracture surface. After superplastic forming, it undergoes 520 ℃/2h solution treatment, water quenching, and aging at 165 ℃/36h, the properties of 2A97 Al- Li were as follows: tensile strength 527MPa, yield strength 441MPa, and elongation 8.3%, respectively.
Achieving superplasticity in hard-to-deform metallic materials using high-pressure sliding (HPS) process
Authors: Horita Z.
Published: June 2023

Abstract. This presentation shows that superplasticity is achieved in hard-to-deform materials when they are processed by severe plastic deformation (SPD) through high-pressure sliding (HPS). The HPS process is similar to the high-pressure torsion (HPT) process as the straining is made under high pressure in highly constrained conditions. It is applicable to a sheet form of samples while the HPT process uses disks or rings, and thus it has advantage that the sample size can be increased. In addition, when the HPS process is combined with a feeding process, the SPD-processed area can be further enlarged without increasing the machine capacity, of which process is called the incremental feeding HPS (IF-HPS). The HPS process is applied to a Ni-based superalloy (Inconel 718), a Ti-6Al-7Nb alloy (F1295) and a Mg-6Al-1Zn alloy (AZ61), and superplasticity is well attained in all the hard-to-deform alloys with total elongations more than 400%. It is also demonstrated that cup forming of the Inconel 718 with practical dimensions is realized by application of the IF-HPS process.
Microstructural characteristics, mechanical and corrosion properties of a low-alloyed Mg alloy after different deformation processing
Authors: Abbasi Z.
Published: June 2023

Abstract. In the evolution of characteristics in Mg alloys, the combined influence of grain refinement by severe plastic deformation (SPD) and alloying elements usually plays a crucial role. Rare earth elements (Y, Gd, and Nd) in combination with Zn have a substantial impact on Mg characteristics in various compositions. In this study, a new dilute extruded Mg-Zn-Gd-Y-Nd alloy was exposed to 5 passes of equal channel angular pressing (ECAP), in a die with a 90° channel angle following route Bc. The initial deformation temperature was 300°C, and it dropped to 200°C with a 25°C step until the fifth pass. Initial and deformed samples were subjected to hardness testing, optical and scanning electron microscopy (SEM) examinations and corrosion tests. After the fifth run of ECAP at 200°C, necklaces of fine recrystallized grains along grain boundaries of elongated unrecrystallized grains in extruded samples transformed to an ultrafine grained microstructure. SEM images reveal the presence of very fine nanoscale dynamic recrystallization (DRX) nuclei in the context of the ECAPed alloy. Furthermore, measures of hardness show the increase in hardness from the starting state to the fifth pass of ECAP. The increase in hardness was caused by dynamic recrystallization, which resulted in a higher percentage of freshly produced grains and grain boundaries. Furthermore, the inclusion of rare earth elements increased grain refinement and controlled the rate of dynamic recrystallization (DRX) during ECAP. On the other hand, severe plastic deformation cause changes in the density and distribution of grain boundaries and defects, which affect the corrosion behavior of magnesium alloys. Additionally, in comparison to the as cast condition the extruded-annealed, ECAPed and as-extruded samples have better corrosion resistance, respectively. It can be concluded that grain refinement has positive effect on decreasing the corrosion rate while homogenization of the extruded microstructure is more effective.
Effect of severe plastic deformation on microstructure and properties of duplex stainless steel
Authors: Gennari C.
Published: June 2023

Abstract. The excellent performance of duplex and super duplex stainless steels due to their high corrosion resistance and high mechanical strength is directly related to their austeno-ferritic microstructure. However, these steels may suffer the formation of secondary brittle phases when they reach temperatures between 600°C and 950°C causing catastrophic service failure of components. In order to understand the influence of the mechanical history of the steel, the equal channel angular pressing was applied on UNS S32750 bar samples. ECAP is processed by using a hydraulic press (DE-80). Microstructural characterization was carried out on the severe plastic deformed samples by means of OM, SEM and EBSD. Ultimate tensile strength has improved with a low decreasing of elongation after the first pass. The ECAP process resulted to produce a faster precipitation of secondary phases if compared with the non-ECAP samples.
Consolidation of AZ31 magnesium chips using equal channel angular pressing
Authors: Al-Maharbi M.
Published: June 2023

Abstract. Equal channel angular pressing (ECAP) as a severe plastic deformation (SPD) technique was employed for consolidation of AZ31 magnesium chips. The chips were consolidated at a temperature of 300 °C following ECAP route A up to two passes. The optical and scanning electron micrographs reveal that consolidation have taken place and the quality of consolidation improves with number of ECAP passes and hence the total imposed strain. The Vickers hardness of the processed samples increased from 41 of the as cast used to generate the chips to 47.7 ad 58.5 of consolidated samples after one and two passes respectively. The consolidation of chips was accompanied by the breakage and dispersion of the oxide layer developed on the surface of the chips during and after machining.
Grain boundary sliding at low temperatures
Authors: Figueiredo R.B.
Published: June 2023

Abstract. Grain boundary sliding plays a key role on the high temperature deformation of fine grained materials. This mechanism is related to a high strain rate sensitivity of approximately 0.5 and usually gives rise to high superplastic elongations. The rate controlling equation for the mechanism of grain boundary sliding has shown good agreement with experimental data for multiple materials, with different grain sizes and tested at different strain rates. However, the predictive ability of the rate controlling equation seems to deteriorate at low temperatures. Although there are experimental evidences of high strain-rate sensitivities in ultrafine grained materials tested at low temperatures, this parameter does not reach values near 0.5 and also there seems to be disagreement in stress level in many conditions. The present overview evaluates the occurrence of grain boundary sliding in ultrafine grained materials at low temperatures considering an adapted rate controlling equation which display good agreement with experimental data. A gradual transition from grain refinement softening at high temperature to grain refinement hardening at low temperatures and a gradual increase in strain rate sensitivity with increasing temperature are observed.
In-situ neutron and synchrotron methods for the investigation of plastic deformation and annealing in metals
Authors: Liss K.-D.
Published: June 2023

Abstract. Following a crash course in neutron and synchrotron diffraction standards, applications are demonstrated on selected metallic systems, comprising the atomic order in titanium aluminide intermetallics at thermal and mechanical processing. High pressure torsion processed specimens show heterogeneous structure and order. Upon heating, their nanostructure evolves revealing regimes of recovery, recrystallization and grain growth, which can be exploited for engineering designated microstructures with enhanced physical and mechanical properties. Advanced analysis of two-dimensional diffractograms by synchrotron radiation allows to distinguish microstructure transformations as well as deformation mechanisms in thermo-mechanical processing. The methods are applicable to a wide range of materials and processes allowing to speed up materials development by orders of magnitude.
Warm tensile properties of low-alloy TRIP steel warm-rolled just prior to isothermal holding treatment
Authors: Hattori K.
Published: June 2023

Abstract. Low-alloy TRIP steel sheets with ultra-high-strength that utilize transformation-induced plasticity of retained austenite have high strength and ductility. In this study, low-alloy TRIP steel sheets with thermo-mechanical treatment with warm rolling were prepared, and the effects of warm rolling on tensile properties were investigated. A hot-rolled sheet of the steel with Ms of 418.5°C was austenized and then quenched in a salt bath kept at 450°C. Two specimens of the sheet were warm-rolled by 40 and 60% and then isothermally held at 350℃ for 1ks. For comparison, a specimen was directly isothermally heat-treated at 350°C for 1ks. The three specimens were subjected to microstructural characterizations and tensile tests at temperatures ranging from 25 to 300°C. It was confirmed that the warm rolling increases the ductility/strength balance. The X-ray diffraction showed that the warm rolling causes an increase in volume fraction of the retained austenite, while its stability against the tensile deformation was somewhat complicated. The effect of the temperature and rolling reduction on the uniform elongation, which is the parameter mostly affected by TRIP, was successfully understood in terms of the volume fraction and the stability of the retained austenite.
Microstructural and corrosion study of a “non-comercial” high manganese steel
Authors: da Silva Lima M.N.
Published: June 2023

Abstract. High-Mn steels have great plasticity when subjected to deformation due to TWIP or TRIP effects. This work evaluated the microstructural evolution, the formation of the -Martensite phase taking into account the hot rolling of 80-60% and the solution annealing. Afterwards, microstructures were analyzed by SEM. Volume fraction of the Austenite and -Martensite phases were measured by EBSD technique. The steel obtained low energy levels of stacking fault, favoring the effect TRIP. Corrosion resistance in 0.1M NaCl solution was analyzed by open potential circuit and potentiodynamic polarization techniques. The analysis of the curves and the surface of the steel after the polarization tests showed that the steel with less strain had relatively nobler potential than the steel with more strain.
Texture and strain rate sensitivity analysis of solid solution and precipitation hardening aluminum alloys processed by repetitive corrugation and straightening
Authors: Elizalde S.
Published: June 2023

Abstract. The potential of improving the mechanical strength by the RCS process is evaluated on the 5754, 6061, and 7075 aluminum alloys, which present different hardening mechanisms related to their respective alloying elements. This work compares the evolution of the texture and the mechanical properties of the different alloys through the RCS processing. The mechanical properties were evaluated by micro-hardness measurements, tensile tests at different temperatures, and strain rates to evaluate the strain-rate sensitivity. The results showed that after two RCS passes, the 6061 and 5754 alloys showed a relatively high strain-rate sensitivity at 300°C. In addition, an increment of 27%, 22%, 15% in hardness was obtained for the 5754, 6061 and 7075 alloys, respectively. Showing the potential of improvement in the mechanical resistance due to the different hardening mechanism. Furthermore, the crystallographic texture was characterized by the obtention of pole figures by X-ray diffraction and the calculation of their orientation distribution functions. The results showed the same trend in the three aluminum alloys, i.e., the initial texture components were conserved, but the texturized volume decreased.
Precise forming of Ti60 alloy by superplastic forming /diffusion bonding
Authors: Jiang S.
Published: June 2023

Abstract. The study investigated the high-temperature tensile behavior of Ti60 alloy at different temperatures (940"℃" to 1040"℃" ) and different strain rates (0.1s-1 to 0.0005s-1). Ti60 exhibited superplasticity with the best deformation temperature ranging from 940"℃" to 960"℃" . The elongation of the samples decreased significantly at the temperatures over 980"℃" due to the growth of grain size. In addition, the study investigated the influence of diffusion bonding temperature and pressure on the microstructure and mechanical properties of the joint. The results showed that there was no microscopic gaps or cracks at the interface of the diffusion bonding joints performed at 2.5MPa, 920"℃" and 2 hours. Thereafter, a four-layer structure of Ti60 alloy was fabricated through the SPF/DB. The component with uniform thickness distribution, high surface quality, high diffusion bonding quality was achieved.
Public-private partnership water supply project in Indonesia
Authors: Auliya Reisi Rizqie , Nurkholis Nurkholis , Sabirin M T.
Published: June 2023

Water supply system management for providing proper services to the community is a challenge for the Government of Indonesia. The Indonesian government through the Public-Private Partnerships (PPPs) scheme involves the role of the private sector for decent, quality, and cost-effective water supply system infrastructure. This study aims to describe problems faced by the Regional water supply system PPP project initiated by business entities (unsolicited) in Indonesia. Also, describes the application of Critical Success Factors as a problem-solving strategy in the implementation of the water supply system PPP project. To express this, This research uses a case study qualitative method involving Government Contracting Agency (GCA) informants from the Ministry of X. Data were collected through semi-structured interviews and documentation studies. It was found that in this case, the water supply PPP project has gone through the stages of PPP agreement signing which still faced problems in land provision, the certainty of raw water sources, inflation, tariff setting, and downstream infrastructure development. GCA seeks to resolve the problem with intensive coordination between related parties, financial and non-financial compensation, alternative sources of raw water, and support from the GCA Budget for downstream development.
Citation:	Implementation of Smart Branding Policy in the River City of Banjarmasin
Authors: Hamjen Hilarion , Oktavianor Tomi , Arbain Taufik
Published: June 2023

This study departs from the regulation of the Mayor of Banjarmasin Number 40 of 2019 concerning the Smart City Masterplan, which requires the implementation of Smart City Banjarmasin revised to maximize the identity of the river city as city branding, namely D(River) smart city. This study aims to identify policies and implementation of Smart Branding Policies in Banjarmasin. This study used a qualitative descriptive approach with data collection techniques carried out by triangulation of sources through literature studies, observation, in-depth interviews, and inductive data analysis. The results show that Smart Branding policies are contained in the Smart City Masterplan for 2022-2026, which was revised based on the 2021-2026 Medium Term Development Plan. Then the implementation of Smart Branding can be identified into three categories: Facilitation of ICT at Riverside View Tower, ICT System Integration in Tourist Areas, and Digitalization of Tourism and Cultural Promotion. In each category, there is a gap between implementation and ideal conditions due to a lack of public participation, data, resources, regulations, and disaster mitigation. However, it is recommended that the gap should be minimized by overcoming the identified constraints so that policy implementation becomes more optimal.
Communication and safe and effective nursing care in surgical center and intensive care: integrative review
Authors: Miranda Marlene da Silva , Nascimento Francisco Anderson Abreu do , Lima Viviane Nayara de Oliveira , Albuquerque Francisco Jandson de , Silva Ana Luiza Gonçalves da , Sales Andresa de Araújo , Costa Lucas Manoel Oliveira , Barbosa Nanielle Silva
Published: June 2023

Objective: To identify the importance of communication for safe and effective nursing care in the surgical center and intensive care. Methods: An integrative review with a survey of productions in February 2023 in the databases Lilacs, MEDLINE, CINAHL, and Scopus. Primary studies, available in full in English, Portuguese, and Spanish, were included. Results: Of the 1,904 productions initially found, 19 were included for analysis. The studies pointed out that communication is essential to guaranty patient safety and to insert the family in the care process. This skill goes beyond verbal expression and involves other ways of communicating.However, it needs to be improved in some situations, mainly to avoid damage to the customer. It is also suggested that some forms of communication require to be standardized. Conclusion: Communication is one of the priorities and fundamental actions for the safety and effectiveness of nursing care, whether in surgical centers or intensive care units. Given this context, it is necessary that communication barriers are identified and that strategic organizational actions are put into practice, including the permanent education of professionals and the standardization of information. Actions like these minimize the potential risks that permeate critical care and positively impact relationships in the work environment
Удельное сопротивление тонкопленочных электродов Si@O@Al и LiCoO-=SUB=-2-=/SUB=-
Authors: Рудый А.С. , Курбатов С.В. , Мироненко А.А. , Наумов В.В. , Егорова Ю.С. , Козлов Е.А.
Published: June 2023

The results of measuring the resistivity of thin-film structures Ti|Si@O@Al|Ti and Ti|LiCoO2|Ti by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) are presented. It was found that, according to the EIS data, the resistance of Ti|Si@O@Al|Ti is three orders of magnitude higher than the CV data, which is due to the nonohmic nature of the metal-semiconductor junction and the varistor effect. It is shown that the Ti-LiCoO2 contact is ohmic, while the nonlinearity of the CVC is well described by the varistor effect. The results obtained are of importance for the interpretation of the impedance spectra of thin-film solid-state lithium-ion batteries based on semiconductor materials.
Теплопроводность гибридных подложек SiC/Si для роста светодиодных гетероструктур
Authors: Кукушкин С.А. , Марков Л.К. , Осипов А.В. , Святец Г.В. , Черняков А.Е. , Павлов С.И.
Published: June 2023

The thermal characteristics of SiC/Si samples obtained by the method of coordinated substitution of atoms at different thicknesses of SiC have been experimentally investigated. It has been found that for SiC thicknesses less than 200 nm, the thermal resistance of SiC/Si is approximately equal to 2 K/W, which coincides with a pure silicon substrate. Such samples will perfectly remove heat from the light-emitting heterostructure grown on SiC/Si. With an increase in the thickness of SiC, the SiC film is detached, which leads to a loss of thermal contact between SiC and Si. The thermal resistance increases at the same time by more than two orders of magnitude. The ability to remove easily the opaque part of the substrate can form the basis of the technology for manufacturing flip-chip LED chips.
Двухканальная гетероструктура с дополнительными цифровыми потенциальными барьерами для мощных полевых транзисторов
Authors: Богданов С.А. , Карпов С.Н. , Пашковский А.Б.
Published: June 2023

The first results of double -channel heterostructures with donor-acceptor doping and systems of alternating thin layers of AlAs/GaAs forming additional digital potential barriers study are presented. It is shown that due to the peculiarities of real space electron transfer in the proposed design, when the surface density of electrons with high mobility is doubled compared to traditional single-channel bilaterally doped heterostructures, even in the absence of digital barriers, the drift velocity overshot does not decrease. The introduction of digital barriers significantly increases the of electrons drift velocity overshot when they fly into the region of a strong field, bringing the drift velocity overshot in the corresponding heterostructures closer to the theoretical limit for the model used – the drift velocity overshot in the undoped bulk material of the channel.
Отражение рентгеновского излучения от изогнутого многослойного зеркала
Authors: Пунегов В.И.
Published: June 2023

A new theoretical method has been developed for calculating the X-ray reflection from a curved multilayer mirror. It is performed the numerical simulation of reciprocal space maps from such mirror, as well as reflection curves in the specular and non-specular directions.