bluuebunny/crossref_metadata_2025 huggingface dataset:
Treatment of Unstable Injury of Pelvic Bones in Pregnant (Case Report)
Authors: Holovakha M.L. , Bohdan O.V. , Kozhemiaka M.O. , Pertsov V.I.
Published: November 2021

Summary. There is no doubt in the relevance of the problem of treatment of patients with unstable fractures of pelvic bones, since these injuries involve a threat to the patient's life in the early period and often lead to disability in the future. This article presents a rare case of treatment of a patient with an unstable pelvis injury, while being 16 weeks pregnant. Patient A., born 1993, was admitted after a road accident injury. The examinations included: X-ray, CT, ultrasound, and gynecologist consultation. The patient was diagnosed with closed bilateral fracture of the pubic and ischial bones with displacement; rupture of the left sacroiliac joint with the boundary fracture of the sacrum (61-С1.3 by the Tile-AO-ASIF classification). The patient was 16 weeks pregnant. The surgery – open reduction and extramedullary metalosteosynthesis – was performed at the 9th day after the injury. The patient was discharged to outpatient treatment at the 12th day after the surgery. She started walking on crutches 3 weeks after the surgery; no additional support was needed since 1.5 months after the surgery. The patient gave birth at 39 weeks by surgical intervention (caesarean section). The baby's condition was assessed as 8 according to the Apgar scale. At the control examination 10 months after the surgery, musculoskeletal function of the patient was fully restored.
Carbon-based nanomaterials with multipurpose attributes for water treatment: Greening the 21st-century nanostructure materials deployment
Authors: Hussain Nazim , Bilal Muhammad , M. N. Iqbal Hafiz
Published: November 2021

Nanotechnology is a top priority research area in a plethora of technological and scientific fields due to its economic impact and versatile capability. Among various applications, water treatment is considered among the most prospective utilization of nanotechnology, where a large number of nanostructured materials can remediate water using several different mechanistic ways. For achieving this, nanomaterials can be combined and modified with active moieties to develop different nanocomposites with structural diversity and unique physicochemical attributes. In addition, they have also been designed and integrated into membranes for improving water treatment performance. In this review, we provide an up-to-date overview of various nanostructured materials as nanoadsorbents, such as carbon-based nanomaterials, nanocomposites, and nanomembranes for remediating pesticide-based pollutants from aqueous systems using CNTs. Notably, nanomaterials are capable of efficiently removing environmental pollutants given their substantial surface area, high absorptive ability, and excellent environmental selectivity and compatibility.
O Segredo Pontifício nos Delitos contra o Sexto Mandamento do Decálogo
Authors: Neckel Silvana
Published: November 2021

O Papa Francisco promulgou a Instrução Sobre a Confidencialidade das Causas e aboliu o segredo pontifício sobre as denúncias, processos e decisões relati-vas aos casos de violência sexual e abuso de menores cometidos por clérigos e con-sagrados, permitindo o compartilhamento das informações colhidas nos procedi-mentos canônicos com as autoridades judiciárias do Estado. O segredo pontifício é semelhante ao segredo profissional, constituindo uma obrigação aos titulares dos cargos eclesiásticos, com objetivo de proteger a intimidade das pessoas, manter a autonomia da Igreja, o funcionamento das instituições e o bem comum. O sigilo sacramental é vinculado ao Sacramento da Penitência e obriga os confessores, sen-do considerado inviolável, pois originário do direito divino. Neste aspecto, o sigilo profissional tem proteção na legislação canônica e na legislação brasileira, a qual considera crime a sua violação.
APPLICATION OF EDGE ANALYTICS TECHNOLOGY TO DEVELOP DIGITAL TWINS OF RUSSIA’S UNITED ELECTRIC POWER SYSTEM FACILITIES
Authors: Колосок Ирина Николаевна , Коркина Елена Сергеевна
Published: November 2021

Технология цифровых двойников является одной из базовых технологий в процессе «цифровизации» энергетики. Важным компонентом цифрового двойника является сбор данных с физического объекта для мониторинга и управления этим объектом. Современные средства информационного обеспечения задач управления режимами ЕЭС России - SCADA и СМПР - предоставляют в центры диспетчерского управления огромные объемы информации, которая может быть использована для создания цифрового двойника отдельного объекта энергетики или всей энергосистемы в целом. В статье для снижения объемов и стоимости передачи и хранения больших объемов данных при создании цифровых двойников объектов энергетики предлагается использовать технологию «Edge Analytics» - граничной аналитики, которая позволяет осуществлять сбор, обработку и анализ данных на периферийных устройствах сети рядом с источником информации. В качестве объекта для создания цифрового двойника рассматривается современная цифровая подстанция.

The technology of digital twins is a basic one in the process of energy "digitalization." An essential component of the digital twin development is data collection from a physical facility to monitor and control this facility. Advanced information support systems designed to control the UES of Russia (SCADA and WAMS) provide control centers with considerable amounts of information, which can be used to create a digital twin of an individual energy facility or entire power system. This paper proposes the use of edge analytics technology that enables the collection, processing, and analysis of data on network peripheral units near the information source, to reduce the amount and cost of transmission and storage of a whole host of data when creating digital twins of energy facilities. A modern digital substation is considered as a facility to be digitally twinned.
INFORMATION CONTENT OF MODELS FOR DETERMINING THE ENVIRONMENTAL CHARACTERISTICS OF THE ENERGY FACILITIES FUNCTIONING
Authors: Майсюк Елена Петровна , Иванова Ирина Юрьевна , Иванов Роман Андреевич
Published: November 2021

В статье сформирована последовательность выполнения действий по определению экологических характеристик функционирования объектов энергетики. Приведены показатели энергообъектов и справочные данные, необходимые для получения промежуточных показателей этапов исследований. Дано описание расчетных моделей определения массы выбросов в атмосферу загрязняющих веществ и парниковых газов и массы образующихся золошлаковых отходов. Модели разработаны на основе утвержденных методик для тепловых электростанций, котельных и дизельных электростанций. Показано, что технологии расчетов экологических характеристик для каждой категории энергообъектов зависят от вида сжигаемого топлива и типа используемого оборудования. Выполнена систематизация информации для моделей определения экологических характеристик функционирования энергетических объектов. Вся необходимая информация представлена в виде трех крупных блоков: характеристика населенных пунктов; показатели энергообъектов; справочные данные по видам топлива, энергетическому и улавливающему оборудованию. Приведено подробное описание показателей каждого блока информации. Показана зависимость перечня определяемых экологических характеристик энергообъектов от вида сжигаемого топлива. Обозначены источники информации и доступность получения показателей каждого блока.

The article forms a sequence of actions to determine the environmental characteristics of the functioning of energy facilities. The indicators of energy facilities and reference data required to obtain intermediate indicators of research stages are presented. A description of the models for determining the mass of emissions of pollutants and greenhouse gases into the atmosphere and the mass of ash and slag waste are described. The models are developed on the basis of approved methodologies for thermal power plants, boiler houses and diesel power plants. It is shown that technologies for calculating environmental characteristics for each category of energy facilities depend on the type of fuel burned and the type of equipment used. The systematization of information for models to determining the environmental characteristics of the functioning of energy facilities has been carried out. All the necessary information is presented in the form of three large blocks: characteristics of settlements; indicators of energy facilities; reference data on types of fuel, energy and capture equipment. A detailed description of the indicators of each block of information is given. The dependence of the list of determined environmental characteristics of energy facilities on the type of burned fuel is shown. The sources of information and the availability of obtaining indicators for each block are indicated.
COMPUTATIONAL EXPERIMENT TECHNOLOGY IN RESEARCH OF POWER INDUSTRIES WHEN IMPLEMENTING THREATS TO ENERGY SECURITY
Authors: Массель Алексей Геннадьевич , Мамедов Тимур Габилович , Пяткова Наталья Ивановна
Published: November 2021

В работе представлен алгоритм проведения вычислительного эксперимента на примере реализации одной из угроз энергетической безопасности «Недостаток инвестиций в отрасли энергетики» с использованием когнитивных и экономико-математических моделей. Рассмотрены особенности включения инвестиционной составляющей в модель оптимизации вариантов развития ТЭК с учетом энергетической безопасности. Представлена когнитивная модель для анализа угрозы «Недостаток инвестиций в отрасли энергетики». Дается описание ПК ИНТЭК-А, обеспечивающего возможность интеграции когнитивных и математических моделей.

The paper presents an algorithm of computational experiment on the example of the implementation of one of the threats to energy security "Lack of investment in the energy sector" using cognitive and economic-mathematical models. The features of the inclusion of the investment component in the model of optimization of options for the development of the fuel and energy complex, taking into account energy security, are considered. A cognitive model for analyzing the threat “Lack of investment in the energy sector” is presented. The description of PC INTEC-A, which provides the ability to integrate cognitive and mathematical models, is given.
METHOD AND MODELS FOR ESTIMATING THE INFLUENCE OF DISTRIBUTED GENERATION DEVELOPMENT ON ELECTRICITY DEMAND AND PRICE IN A REGION
Authors: Гальперова Елена Васильевна
Published: November 2021

Актуальность статьи обусловлена переходом энергетики на путь интеллектуального развития. Одной из характеристик этого перехода является расширение перспектив децентрализованного производства электроэнергии. В новых условиях у потребителя появляется возможность изменять свое энергопотребление в зависимости от стоимости энергоресурсов, иметь собственные установки по производству и/или хранению электроэнергии. В статье кратко представлены особенности использования и технологии распределенной генерации (РГ) энергии в отдельных секторах экономики (промышленности, жилом и коммерческом секторах, на транспорте). Приведены некоторые способы определения перспективных значений мощностей РГ у потребителей. Предложен подход к моделированию и оценке влияния масштабов распределенной генерации на долгосрочное развитие региональных систем энергоснабжения. Отличительной чертой подхода является использование ранее разработанной оптимизационной стохастической модели объединенной энергосистемы макрорегиона в качестве основы для разработки ее региональной модификации и источника прогнозной информации об условиях развития региональной энергосистемы. Несмотря на то, что предложенный подход дает лишь приблизительную оценку, это позволяет очертить перспективный диапазон изменения стоимости и спроса на электроэнергию в регионе при разных вариантах развития РГ.

The relevance of the article is due to the transition of energy to the path of intellectual development. One of the characteristics of this transition is the broadening of the prospects for decentralized electricity generation. Under the new conditions, a consumer has the opportunity to change his energy consumption depending on the cost of energy resources, to have his own installations for the production and / or storage of electricity. The article briefly presents the features of the use and technology of distributed generation (DG) energy in certain sectors of the economy (industry, residential and commercial sectors, transport). Some methods of determining the prospective values of the power of the RG at consumers are given. An approach to modeling and assessing the impact of the scale of distributed generation on the long-term development of regional power supply systems is proposed. A distinctive feature of the approach is the use of the previously developed stochastic optimization model of the unified power system of the macroregion as a basis for the development of its regional modification and a source of forecast information on the conditions for the development of the regional power system. Of course, the proposed approach gives only a rough estimate, but it allows us to outline a promising range of changes in the cost and demand for electricity in the region under different options for the development of the RG.
RR Lyrae Stars in the Newly Discovered Ultra-faint Dwarf Galaxy Centaurus I*
Authors: Martínez-Vázquez C. E. , Cerny W. , Vivas A. K. , Drlica-Wagner A. , Pace A. B. , Simon J. D. , Munoz R. R. , Walker A. R. , Allam S. , Tucker D. L. , Adamów M. , Carlin J. L. , Choi Y. , Ferguson P. S. , Ji A. P. , Kuropatkin N. , Li T. S. , Martínez-Delgado D. , Mau S. , Mutlu-Pakdil B. , Nidever D. L. , Riley A. H. , Sakowska J. D. , Sand D. J. , Stringfellow G. S. ,   (DELVE Collaboration)
Published: November 2021

We report the detection of three RR Lyrae (RRL) stars (two RRc and one RRab) in the ultra-faint dwarf (UFD) galaxy Centaurus I (Cen I) and two Milky Way (MW) δ Scuti/SX Phoenicis stars based on multi-epoch giz DECam observations. The two RRc stars are located within two times the half-light radius (r

h
) of Cen I, while the RRab star (CenI-V3) is at ∼6 r

h
. The presence of three distant RRL stars clustered this tightly in space represents a 4.7σ excess relative to the smooth distribution of RRL in the Galactic halo. Using the newly detected RRL stars, we obtain a distance modulus to Cen I of μ
0 = 20.354 ± 0.002 mag (σ = 0.03 mag), a heliocentric distance of D
⊙ = 117.7 ± 0.1 kpc (σ = 1.6 kpc), with systematic errors of 0.07 mag and 4 kpc. The location of the Cen I RRL stars in the Bailey diagram is in agreement with other UFD galaxies (mainly Oosterhoff II). Finally, we study the relative rate of RRc+RRd (RRcd) stars (f
cd) in UFD and classical dwarf galaxies. The full sample of MW dwarf galaxies gives a mean of f
cd = 0.28. While several UFD galaxies, such as Cen I, present higher RRcd ratios, if we combine the RRL populations of all UFD galaxies, the RRcd ratio is similar to the one obtained for the classical dwarfs (f
cd ∼ 0.3). Therefore, there is no evidence for a different fraction of RRcd stars in UFD and classical dwarf galaxies.
Scoping Review of Mental Health Problems among Female Prisoners
Authors: Hidayati Nur Oktavia , Suryani Suryani , Rahayuwati Laili , Dewi Nur Setiawati
Published: November 2021

BACKGROUND: Detention can cause problems and stressors for prisoners, one of which is mental health problems. Female prisoners have a high rate of mental health needs in prisons. Awareness and the ability to recognize prisoners’ health problems are important. Therefore, the mental welfare of female prisoners is the responsibility of each prison.

AIM: This review aimed to identify mental health problems among female prisoners.

METHODS: The method used was a scoping review. A systematic searched of the literature between 2000 and August 2021 on several databases and search engines, namely, PubMed, CINAHL, SAGE Journals, and Google Scholar using keywords in English, namely, mental health, female prisoners, and prison.

RESULTS: Of the 112 articles found, nine were eligible for inclusion. It was found that the mental health problems of female prisoners were anxiety, depression, substance abuse, stress, loss and grief, trauma, and suicide attempts that put them at risk of psychological distress. There was still limited study on female prisoners, especially to explore mental health problems in prison, and there were few studies discussing adjustment to female prisoners in prison, as well as mental health services which are still rarely carried out in prisons.

CONCLUSION: Based on the findings, it is recommended for future research to focus more on how female prisoners can access mental health services in prisons to overcome their mental health problems, conduct a deeper exploration of the extent to which mental health services in prisons have been carried out so far.
Culture versus Technology: Bridging the Gap to Improve COVID-19 Prevention and Care based on the COVID-19 Task Force Perspectives
Authors: Susanti Raini Diah , Juniarti Neti , Yani Desy Indra , Nurhasanah Nurani
Published: November 2021

BACKGROUND: The diversity of Indonesians’ cultural backgrounds is a challenge for Indonesia’s coronavirus disease (COVID)-19 Task Force efforts to prevent COVID-19. The “infodemic” or misleading information in the community generates both positive and negative responses toward COVID-19.

AIM: The study aims to explore the extent of Indonesia’s COVID-19 prevention and care efforts based on the perspective of the COVID-19 Task Force officers, as the frontline in society.

METHODS: This descriptive qualitative study explored the extent of COVID-19 prevention and care based on the perspective of 16 COVID-19 Task Force participants from each region in Sumedang, Indonesia. Data collection was undertaken during the pandemic through semi-structured interviews using telephone (n = 13) and face-to-face (n = 3) approaches.

RESULTS: Four themes emerged: community sentiment toward COVID-19, origin of COVID-19 in the region, collective cultural activities in local communities, and the use of information and communication technology related to COVID-19.

CONCLUSION: Collaboration with religious leaders and community leaders to integrate the concept of cultural care with the use of technology can be developed to improve COVID-19 prevention and care.
Intraspecies multiple chromosomal variations including rare tandem fusion in the Russian Far Eastern endemic evoron vole Alexandromys evoronensis (Rodentia, Arvicolinae)
Authors: Kartavtseva Irina V. , Sheremetyeva Irina N. , Pavlenko Marina V.
Published: November 2021

The vole Alexandromys evoronensis (Kovalskaya et Sokolov, 1980) with its two chromosomal races, “Evoron” (2n = 38–41, NF = 54–59) and “Argi” (2n = 34, 36, 37, NF = 51–56) is the endemic vole found in the Russian Far East. For the “Argi” chromosomal race, individuals from two isolated populations in mountain regions were investigated here for the first time using GTG-, GTC-, NOR methods. In the area under study, 8 new karyotype variants have been registered. The karyotype with 2n = 34 has a rare tandem fusion of three autosomes: two biarmed (Mev6 and Mev7) and one acrocentric (Mev14) to form a large biarmed chromosome (Mev6/7/14), all of which reveal a heterozygous state.

For A. evoronensis, the variation in the number of chromosomes exceeded the known estimate of 2n = 34, 36 and amounted to 2n = 34, 36, 38–41. The combination of all the variations of chromosomes for the species made it possible to describe 20 variants of the A. evoronensis karyotype, with 11 chromosomes being involved in multiple structural rearrangements. In the “Evoron” chromosomal race 4 chromosomes (Mev1, Mev4, Mev17, and Mev18) and in the “Argi” chromosomal race 9 chromosomes (Mev6, Mev7, Mev14, Mev13, Mev11, Mev15, Mev17, Mev18, and Mev19) were observed. Tandem and Robertsonian rearrangements (Mev17/18 and Mev17.18) were revealed in both chromosomal races “Evoron” and “Argi”.
Créativités agronomiques et rituelles dans les vignobles suisses. Une étude des engagements pluriels dans la viticulture biodynamique
Authors: Grandjean Alexandre
Published: November 2021

Cet article aborde les engagements pluriels de vignerons et vigneronnes suisses dans les lignes de conduite de la viticulture biodynamique. Je montrerai par le terrain qu’un segment de la population vigneronne adapte et module de manière créative les prescriptions émanant de figures d’experts alternatifs. Ce faisant, les vignerons négocient une distance pragmatique vis-à-vis de la filiation de la biodynamie avec le mouvement anthroposophique.
La rencontre d’abord. Contributions d’une anthropologie romanès à l’anthropologie générale
Authors: Pontrandolfo Stefania , Solimene Marco
Published: November 2021

L’hommage à Patrick Williams que nous proposons dans cet article est un hommage à une certaine approche anthropologique des Tsiganes-Roms qu’il a contribuée à construire avec constance et conscience : une approche originale qui fonde solidement toute proposition théorique sur l’expérience ethnographique de la rencontre réelle avec des personnes qui incarnent différentes façons de penser et de vivre notre monde. Dans cet article, nous montrerons comment les rencontres ethnographiques d’anthropologues comme Patrick Williams avec différents groupes de Tsiganes-Roms ont produit un processus de transformation de l’anthropologie des Tsiganes-Roms en une anthropologie romanès (c’est-à-dire « à la manière des Tsiganes-Roms »), participant activement au travail constant de décolonisation de la pensée anthropologique générale.
A symmetric property in the enhanced common index jump theorem with applications to the closed geodesic problem
Authors: Hamid Muhammad , Wang Wei
Published: November 2021

In this paper, we prove a symmetric property for the indices for symplectic paths in the enhanced common index jump theorem (cf. Theorem 3.5 in [6]). As an application of this property, we prove that on every compact Finsler manifold \begin{document}$ (M, \, F) $\end{document} with reversibility \begin{document}$ \lambda $\end{document} and flag curvature \begin{document}$ K $\end{document} satisfying \begin{document}$ \left(\frac{\lambda}{\lambda+1}\right)^2<K\le 1 $\end{document}, there exist two elliptic closed geodesics whose linearized Poincaré map has an eigenvalue of the form \begin{document}$ e^{\sqrt {-1}\theta} $\end{document} with \begin{document}$ \frac{\theta}{\pi}\notin{\bf Q} $\end{document} provided the number of closed geodesics on \begin{document}$ M $\end{document} is finite.
High and low perturbations of Choquard equations with critical reaction and variable growth
Authors: Zhang Youpei , Tang Xianhua , Rădulescu Vicenţiu D.
Published: November 2021

We are concerned with the existence of ground state solutions to the nonhomogeneous perturbed Choquard equation

   \begin{document}$ - \Delta_{p(x)} u + V(x)|u|^{p(x) - 2} u $\end{document}

   \begin{document}$ = \left( \int_{\mathbb R^N} r(y)^{-1}|u(y)|^{r(y)}|x-y|^{-\lambda(x,y)} dy\right) |u|^{r(x)-2} u+g(x,u)\ \mbox{in}\ \mathbb R^N, $\end{document}

where the exponent \begin{document}$ r(\cdot) $\end{document} is critical with respect to the Hardy-Littlewood-Sobolev inequality for variable exponents. We first consider the case where the perturbation \begin{document}$ g(\cdot ,\cdot) $\end{document} is subcritical and we distinguish between the superlinear and sublinear cases. In both situations we establish the existence of solutions and we prove the asymptotic behavior of low-energy solutions in the case of high perturbations. Next, we study the case where the nonlinearity \begin{document}$ g(\cdot ,\cdot) $\end{document} is critical. We prove the existence of solutions both for low and high perturbations and we establish asymptotic properties of low-energy solutions.
Shark bite survivors advocate for non-lethal shark mitigation measures in Australia
Authors: Rosciszewski-Dodgson Michael J. ,   Marine Planning and Management, Faculty of Science and Engineering, L69 3BX Liverpool, United Kingdom, Cirella Giuseppe T. ,   Faculty of Economics, University of Gdansk, 81-824 Sopot, Poland
Published: November 2021

As the annual number of shark-related human casualties in Australia increases, there is a need for policymakers to grasp how policy is created in the discourse of shark bite incidences. This is discussed in relation to individuals who have been most affected, i.e., shark bite survivors. The defined argument, being that, victims should feel the most animosity towards sharks, therefore if they show signs of discontent towards culling programs, the government should be compelled to change their strategy. The paper reinforces and challenges assumptions that contribute to the flow of commonly accepted knowledge of shark-human relations by illustrating how shark bite survivors are unlikely marine conservation advocates who support non-lethal shark mitigation methods. Shark bite victims were contacted via two Australian-based organizations and a total of six qualitative semi-structured interviews were conducted. Government shark mitigation practices are perceived as heavy handed and further perception- and conservation-based research is needed.
Global existence of small displacement solutions for Hookean incompressible viscoelasticity in 3D
Authors: Jonov Boyan , Kessenich Paul , Sideris Thomas C.
Published: November 2021

The initial value problem for incompressible Hookean viscoelastic motion in three space dimensions has global strong solutions with small displacements.
Core point pixel-level localization by fingerprint features in spatial domain
Authors: Ye Xueyi ,   Lab of Pattern Recognition and Information Security, Hangzhou Dianzi University, Hangzhou 310018, China, Shen Yuzhong , Zeng Maosheng , Liu Yirui , Chen Huahua , Zhao Zhijing ,   Department of Modeling, Simulation and Visualization Engineering, Old Dominion University, Commonwealth of Virginia VA 23529, USA
Published: November 2021

Singular point detection is a primary step in fingerprint recognition, especially for fingerprint alignment and classification. But in present there are still some problems and challenges such as more false-positive singular points or inaccurate reference point localization. This paper proposes an accurate core point localization method based on spatial domain features of fingerprint images from a completely different viewpoint to improve the fingerprint core point displacement problem of singular point detection. The method first defines new fingerprint features, called furcation and confluence, to represent specific ridge/valley distribution in a core point area, and uses them to extract the innermost Curve of ridges. The summit of this Curve is regarded as the localization result. Furthermore, an approach for removing false Furcation and Confluence based on their correlations is developed to enhance the method robustness. Experimental results show that the proposed method achieves satisfactory core localization accuracy in a large number of samples.
On threshold dynamics for periodic and time-delayed impulsive systems and application to a periodic disease model
Authors: Huo Hai-Feng ,   Department of Applied Mathematics, Lanzhou University of Technology, Lanzhou, Gansu, 730050, China, Wu Fan , Xiang Hong
Published: November 2021

The basic reproduction ratio $ \mathcal{R}_{0} $ of more general periodic and time-delayed impulsive model which the period of model coefficients is different from that of fixed impulsive moments, is developed. That $ \mathcal{R}_{0} $ is the threshold parameter for the stability of the zero solution of the associated linear system is also shown. The developed theory is further applied to a swine parasitic disease model with pulse therapy. Threshold results on its global dynamics in terms of $ \mathcal{R}_{0} $ are obtained. Some numerical simulation results are also given to support our main results.
New approximation properties of the Bernstein max-min operators and Bernstein max-product operators
Authors: Coroianu Lucian , Gal Sorin G.
Published: November 2021

In this paper we put in evidence localization results for the so-called Bernstein max-min operators and a property of translation for the Bernstein max-product operators.
Professor, onde vou usar isso? Ressignificando velhas perguntas em uma sociedade líquida
Authors: Damázio júnior Valdir
Published: November 2021

O presente artigo tem por objetivo discutir algumas das características de nossa sociedade contemporânea sob a perspectiva teórica da modernidade líquida desenvolvida pelo sociólogo Zygmunt Bauman. Podemos destacar como características da modernidade líquida, um rompimento radical com as promessas de certeza e controle propostos pela fase sólida da modernidade, a aceleração da velocidade das mudanças sociais e a overdose de informações a que estamos expostos diariamente. Além disso analisaremos alguns dos principais desafios que a modernidade líquida impõe à educação. Com esse objetivo pretende-se partir da pergunta professor, onde vou usar isso? para discutir o papel da educação em nossa sociedade contemporânea. Para isso vamos tentar situar professor, aluno e escola dentro do contexto atual de uma modernidade líquida, tentando assim amadurecer um pouco nossa compreensão sobre os desafios educacionais que vivenciamos tanto na prática docente quanto na formação de professores.
Corpo, educação e identidade em comunidades quilombolas
Authors: Maroun Kalyla
Published: November 2021

Este artigo tem como objetivo refletir sobre o papel que o corpo pode assumir nos processos de construção identitária em comunidades quilombolas, por meio da observação de diferentes práticas educativas nas quais tais grupos estão inseridos. Foi desenvolvido a partir de uma apresentação da bibliografia disponível sobre as interfaces analíticas possíveis entre corpo, educação e identidade quilombola, bem como através da explanação de alguns dados de campo, que dialogam com essa temática, relativos ao contexto de duas comunidades quilombolas do estado do Rio de Janeiro. Percebe-se o protagonismo do corpo, por meio de determinadas práticas culturais/corporais, ou de processos formativos/educativos diferenciados voltados a ele, na construção e afirmação das identidades quilombolas de algumas comunidades do país. Entretanto, vale ressaltar a ausência de pesquisas que debatam o papel do corpo na Educação Escolar Quilombola, o que indica uma agenda de pesquisa ainda a ser constituída.
Kinematic Viscosity and Electrical Resistivity of a Multicomponent Melt due to Liquid–Liquid Structure Transition
Authors: Tsepelev Vladimir , Starodubtsev Yuri N. , Konashkov Viktor V. , Kochetkova Yekaterina A.
Published: November 2021

We investigated the kinematic viscosity and electrical resistivity of the multicomponent Fe74Cu1Nb1.5Mo1.5B8.5Si13.5 melt during three heating–cooling cycles. The temperature dependence of kinematic viscosity and electrical resistivity have the anomalous zones in the same temperature range and they are associated with the liquid–liquid structure transition (LLST). The anomalies were explained by changes in the activation energy and the cluster size. As the cluster size decreases, the activation energy decreases, but the viscosity and electrical resistance increase. LLST begins with the cluster dissolution, and as a result, the Arrhenius plot becomes nonlinear in the transition temperature range. After three cycles of heating–cooling, the temperature dependences of the kinematic viscosity and electrical resistance did not qualitatively change, and this allows us to conclude that LLST is thermoreversible. With an increase in the number of thermal cycles, the activation energy of viscous flow decreases, as well as the onset temperature and temperature range of LLST.
Effect of Heat Treatment Conditions on Microstructures and Mechanical Properties of Cu-9Ni-6Sn-0.22Nb Alloy
Authors: Xu Si Yang , Li Ying Long , Zhang Mu Xin , Jiang Yi Fu , Ding Hua
Published: November 2021

Due to its high strength, excellent electrical conductivity and high resistance to stress corrosion, Cu-Ni-Sn alloy has been selected as a kind of advanced metal material which can be used as the manufacture of springs, connectors, bearings and so on. In addition, the addition of Nb can efficiently improve the comprehensive properties of the alloy. In the present work, the effect of heat treatment conditions on microstructure and mechanical properties were studied in a Cu-9Ni-6Sn-0.22Nb alloy by means of optical microscopy (OM), transmission electron microscopy (TEM), tensile test and microhardness tests. The results show that before ageing, a large number of fine γ precipitates with DO22type structure are distributed on the matrix. With the prolongation of ageing time, the ultimate tensile strength (UTS), yield strength (YS) and Vickers hardness increased firstly, and then decline. The reason can be attributed to the occurrence of spinodal decomposition and the formation of discontinuous precipitation (DP). At first, spinodal decomposition induced the enhanced interaction between dislocations and internal stress field, resulting in an increase of mechanical properties. Then the increased DP at grain boundaries leads to the decline of strength in the material. Finally, the relationship between the microstructure and the electrical conductivity was also analyzed, and the results show that the electrical conductivity increased with ageing time/ageing temperature increasing for the present alloy. Through the analysis of Matthiessen’ s rule, the variation of electrical resistivity depends on precipitates, solute atoms, dislocations, vacancies and grain boundaries, and the precipitates play an important role among them. Besides, more precipitates improve electrical conductivity. Therefore, the increase of ageing time/ageing temperature induced the increase of DP, resulting in an increase of electrical conductivity.
Casting of Wire Using a Twin Wheel Caster
Authors: Haga Toshio , Tahara Ryusei , Watari Hisaki , Nishida Shinichi
Published: November 2021

A twin-wheel caster for casting thin aluminum alloy wire was designed, assembled, and tested. Molten metal was ejected from the nozzle (cross-sectional area: 4 mm2) of a crucible into a triangular groove that was machined on the outer surface of the lower wheel. The metal was solidified by the upper and lower wheels. Wire made of Al-1.2%Fe or 6061 aluminum alloy, whose cross-sectional area was smaller than 20 mm2, could be cast at a speed of 6 or 7 m/min. The upper and lower wheels were made of copper to increase the cooling rate. The diameter of the upper and lower wheels was 200 and 600 mm, respectively. The thickness of the wheels was 10 mm.
The Effect of Sintering Profiles on Zirconia Toughened Alumina (ZTA) Prepared by Two-Stage Sintering
Authors: Loong Teow Hsien , Sivanesan Sivakumar , Eh Noum Se Yong
Published: November 2021

The effects of sintering profiles on the Zirconia Toughened Alumina (ZTA) composite containing 0 vol% Y-TZP (pure alumina) to 20 vol% Y-TZP content prepared by a sintering method known as two-stage sintering were investigated. The heating rate was set between 10°C/min to 20°C/min, T1 set between 1400°C to 1500°C, T2 at 1350°C and holding time was set at 12 hours. The samples’ microstructural properties and mechanical properties, including bulk density, Vickers hardness, Young’s modulus and fracture toughness, were evaluated. Based on the data obtained, the ZTA composites with 10 vol% Y-TZP sintered at a heating rate of 10°C/min and holding time of 12 hours were able to achieve mechanical properties requirements set by the industry standard. In addition, the maximum ZTA composite’s bulk density was recorded to be above 90% T.D, while the Vickers hardness of the composite was recorded to be exceeding 17 GPa. The ZTA composite also recorded maximum Young’s modulus exceeding 380 GPa and fracture toughness above 6 MPam1/2.
Study on Test Methods of Tensile Properties of Continuous Alumina Fiber Bundles
Authors: Zhang Li Li , Ci Ji Liang , Wang Yan Ru , Wang Hua Qiong , Gao Zeng Hua
Published: November 2021

In this paper, the effects of different sample clamping modes, curing time of the adhesive during sample preparation, gauge length of the sample and tensile rate on the tensile properties of continuous alumina fiber bundles are briefly introduced. These parameters can accurately affect the tensile properties of alumina fiber bundles.
Exploration of Thermal Degradation Kinetics of Epoxy Resin Composites
Authors: Du Jin , Wu Zheng Huan , Wang Quan
Published: November 2021

The thermal degradation process of epoxy resin/intumescent flame retardant/flake graphite/hexagonal boron nitride (EP/IFR/FGP/h-BN) was analyzed by thermogravimetry. The effects of binary nano flake graphite/hexagonal boron nitride as synergistic flame retardant on the thermal stability. Flynn wall Ozawa method was used to calculate the activation energy of thermal degradation kinetics of EP/IFR/FGP/h-BN. The mechanism functions of the EP/IFR/FGP/h-BN in different reaction stages were determined according to Malek method, and the thermal degradation mechanism of EP/IFR/FGP/h-BN was obtained. The binary nanoFGP/h-BN is helpful to improve the thermal stability of EP.
Powder Injection Moulding and Liquid Phase Sintering of Aluminium - SiC Particulate Composite
Authors: Patcharawit Tapany , Thongbo Phongsathon , Sengna Nitithorn , Auttachon Piyanat , Chuankrerkkul Nutthita
Published: November 2021

Metal matrix composite has been increasingly appreciated by many engineering applications due it its tailored properties for specific uses. Powder injection moulding is one of the most effective composite processing essentially for small and complex parts. Moulding of feedstock is the key step determining green and sintered properties. This research investigated effects of moulding parameters which are % solid loading and moulding speed on microstructure and properties of aluminium composite. Commercial aluminium alloy powder and SiC particulate at 15 vol.% addition were formulated at 55 % and 60 % solid loading. Injection moulding were operated using a horizontal screw driven typed machine at 1600-1800 rpm speed and 280 - 300 °C moulding temperature. After sintering at 655 °C, property assessment via microstructure, density, % shrinkage, distortion and hardness were carried out. It was found that feedstock of 55 % solid loading occasionally led to flash problem while that of higher solid loading experienced higher viscosity to fulfill four-cavity mould. Moulding speed investigated did not significantly affect mould filling and overall properties. Sintered microstructures generally showed well-distributed SiC particulate in the aluminium matrix. The optimum injection moulding condition was the feedstock prepared at 60% solid loading, moulding at 1800 rpm speed, which offered theoretical density of greater than 98.5 % and micro Vickers hardness of 125.2 Hv.
Improving Study on Wear Resistance and Mechanical Properties of Graphene / Polyurethane Microfoam Composites
Authors: Lv Guang Lei , Liu Xin Mei , Zhao Ming , Li Yuan Yuan
Published: November 2021

Modified reduced graphene oxide (rtgo) was prepared by using γ - isocyanate propyl triethoxysilane (IPTS) as modifier. Graphene / polyurethane nanocomposites were prepared by in-situ polymerization. Graphene / polyurethane composites were characterized by scanning electron microscopy, TGA, DIN abrasion and electronic universal testing machine. The effects of different reaction formulations and graphene addition on the wear resistance and mechanical properties of the composites were studied. The results show that the wear resistance and tear resistance of the composite can be greatly improved after the functional graphene is compounded with polyurethane.
Hydrothermal Fabrication of BiVO4/ Diatomite Composite Photocatalysts and their Photocatalytic Performance
Authors: Cui Tian Qing , Ma Jun Feng , Wang Qun Si , Zhou Qi , Tang Dong Bin
Published: November 2021

A hydrothermal process was proposed to prepare BiVO4/ diatomite composite photocatalysts, where BiVO4 was grown from a precursor solution containing diatomite, and EDTA used as a chelating agent to prevent the precipitation of precursor solution compositions on diatomite before hydrothermal treatment. The effect of some processing parameters like diatomite percentage and Ag-loaded amount on their photocatalytic performance were also investigated in detail by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), BET, and UV‐Vis spectroscopy. The results show that BiVO4/ diatomite composite photocatalysts can be successfully prepared at 160 °C for the duration of 3h by the hydrothermal process. The diatomite has two significant impacts on their photocatalytic performance: (1) enhancing the dispersion of BiVO4 crystallites due to its high porosity and specific surface area to favor their photocatalytic performance, and (2) having a light screening effect to incident visible light to decrease their photocatalytic activity. Appropriately incorporating diatomite could improve their photocatalytic performance, but the overuse of diatomite would reduce that. Similarly, depositing Ag could effectively improve their photocatalytic activity because of its good light absorption and photosensitive characteristics, but excessive addition would result in their decrease since the overuse of Ag would also promote the electron-hole recombination.
The Potential Use of Brick Wastes in the Generation of New Materials for Construction through Geopolymerization Processes
Authors: Correa-Jaramillo Ramiro , Zúñiga-Torres Berenice , Zúñiga-Suárez Alonso , Hernández-Olivares Francisco , Briceño-Tacuri Israel
Published: November 2021

The calcined clay bricks are the second most used materials in construction that, after the demolition processes, tends to become rubble, generating a negative visual and environmental impact, in addition to the fact that the brick-making process has not been industrialized in Ecuador, for that, its properties are deficient; in this way, the present research aims to study the physical, chemical and mineralogical characteristics of brick waste from the Southern part of ​​this country, for the elaboration of ecological bricks through geopolymerization processes, using as alkaline activator Sodium Hydroxide at temperature ranged between 90 °C and 200 °C, obtaining an optimal mixture at the combination 12.5 M, 26 wt% Cs, 150 °C. The mechanical properties of bricks as simple compression and flexural strength, respectively, applying the experimental Griffith criterion method by finite element simulation method. These ecological bricks obtained are suitable for use in construction.
Effect of Sensitization Time on Intergranular Corrosion of 347H Stainless Steel
Authors: Chang Liang , Zhang Xue Tao , Zhao Zhi Juan , Peng Yun Yan , Li Jing Miao , Jin Dong
Published: November 2021

In this paper, 347H stainless steel of three situation of solution, primary and secondary stabilizing with 0, 12, 24, 48 and 72 h accelerated sensitization heat treatment. The change of sensitization degree with time was studied by metallographic test, double-loop electrochemical potentiodynamic reactivation (DL-EPR) test, intergranular corrosion test and microscopic morphology observation. The result shows that the sensitization degree of the solution material increases rapidly and reaches the maximum value after 12h sensitization heat treatment. After that, it still belonged to severe sensitization situation, but the index gradually decreased. After stabilizing heat treatment, the sensitization degree of the material is lower than the situation of solution. After heat treatment for 48h, the material located on “possible sensitization” range, and the sensitization degree of the secondary stabilized material was always lower than is of the primary. It indicates that the sensitization of materials can not be completely inhibited by stabilizing heat treatment, and other anti-corrosion measures should be considered.
Microstructural Characteristic and Solid Particle Erosion Behavior of Plasma-Sprayed Ni60/Ni-WC Composite Coating
Authors: Wang Dong Sheng , Fang Yang Zhi , Qu Guang , Zhou Xing Hua
Published: November 2021

A Ni60/Ni-WC composite coating was fabricated by the plasma spraying technology and microstructure of the coating was analyzed. Moreover, erosion resistance of the coating under different erosion angles was tested. Results demonstrated that the coating has lamellar structures and contain some pores. WC particles distribute evenly in the coating and bond well with the parent phase. When the erosion angle increase, the weight loss of the erosion-induced coating increases firstly and then decreases, showing plastic-brittle composite erosion characteristics.
Jak powstawał Kopiec Kościuszki w Krakowie – jego dzieje w czasach Rzeczypospolitej Krakowskiej
Authors: Danowska Ewa
Published: November 2021

W Krakowie 23 czerwca 1828 r. odbył się pogrzeb zmarłego rok wcześniej Tadeusza Kościuszki. Zwłoki Naczelnika uroczyście złożono w katedrze na Wawelu, a Senat Wolnego Miasta Krakowa postanowił go uczcić odpowiednim pomnikiem. Pojawiły się wśród rządzących Krakowem, jak i mieszkańców, liczne propozycje jego formy. Zdecydowano się usypać ku czci bohatera Mogiłę na wzgórzu św. Bronisławy, na wzór istniejących kopców Krakusa oraz Wandy. Stosowną uchwałę Senat podjął 19 lipca 1820 r. Została zainicjowana zbiórka potrzebnych funduszy oraz zaplanowano przebieg prac. Uroczysta inauguracja odbyła się 16 października 1820 r. Powołano Komitet Budowy Pomnika Tadeusza Kościuszki, który miał czuwać nad przebiegiem prac i stroną finansową przedsięwzięcia. Społeczeństwo aktywnie włączyło się w działania, które prowadzono nie bez trudności czy przykrych niespodzianek natury technicznej i budowlanej. Planowano założenie wokół Kopca osady, której mieszkańcy sprawowaliby opiekę nad Mogiłą, co nie zostało zrealizowane. 25 października 1823 r. odnotowano zakończenie prac nad budową Kopca Kościuszki. Uporządkowano przyległy teren, budując dogodną drogę. Prace konserwatorskie nad kopcem trwały, co się okazało konieczne, nieustannie. Władze austriackie po likwidacji Rzeczypospolitej Krakowskiej zaakceptowały istnienie Kopca, a w 1860 r. na jego wierzchołku umieszczono granitowy głaz z inskrypcją.

How Kościuszko Mound in Krakow was created – events during the Republic of Krakow

23 June 1828 saw the funeral in Krakow of Tadeusz Kościuszko, who had died a year earlier. The corpse of the Commander was ceremoniously placed in Wawel Cathedral, and the Senate of the Free City of Krakow decided to commemorate him with a suitable monument. Numerous suggestions concerning its form appeared from the leaders of Krakow as well as its residents. It was decided to create a mound for the hero on Bronisława Hill, based on the already existing Krakus and Wanda mounds. A suitable resolution was passed Jak powstawał Kopiec Kościuszki w Krakowie... 63 by the Senate on 19 July 1820. A collection of necessary funds was initiated and the course of work was planned. The ceremonial inauguration took place on 16 October 1820. The Tadeusz Kościuszko Monument Construction Committee was established, with the aim of supervising the work and financial aspects of the undertaking. Local society actively participated in the activities, which were not without difficulties or unpleasant surprises of a technical or construction nature. The establishment of a settlement around the Mound was planned, with the residents taking care of the Mound, but was not carried out. On 25 October 1823, work on the construction of Kościuszko Mound ended. The surrounding area was developed and a road built. Maintenance work on the Mound continued and turned out to be a constant necessity. The Austrian powers accepted the existence of the Mound after the end of the Republic of Krakow, and in 1860 placed a granite stone with an inscription on its peak.