bluuebunny/crossref_metadata_2025 huggingface dataset:
An Experimental Study on Compressive Strength of the Concrete Containing Type II Cement and Tire-Rubber Particles at Various Ages
Authors: Hassan Vanhari Seyyed Meyssam , Gholhaki Majid
Published: February 2023

Compressive strength of concrete is one of the most important properties of concrete for designers and quality control engineers and the engineering community is interested in predicting 28-day compressive strength of concrete because of the strength of concrete at younger ages such as 7 days. Portland cement type II is one of the most widely used cements, which has the highest consumption because of the weather conditions and the construction process of structures in Iran. The relation for computing the compressive strength at the age of t based on the 28-day strength has been presented only for cement types I and III and there is no relation for type II cement in ACI codes of practice. In this study, the compressive strength of concrete at the age of t based on the 28-day strength has been experimentally investigated for the concretes containing cement type II and tire rubber particles. To this end, three cement grades of 350, 400, and 450 kg/m3 as well as water-to-cement ratios (w/c) of 0.5 and 0.65 were used. Moreover, cement was replaced with tire-rubber particles at contents of 5 to 20 % by volume. The values for α and β coefficients to be applied in the concrete strength relation based on the age of 28 days according to ACI209 for the concretes containing type II cement and tire-rubber particles were obtained equal to 3.13 and 0.91 as well as 3.32 and 0.9, respectively. Finally, the best mix design was found to do with the ordinary concrete with cement grade of 400 kg/m3, w/c of 0.5 and tire-rubber particles of 5 % that leads to the highest compressive strength by which the environmental issues could be markedly mitigated.
SOLVOTHERMAL SYNTHESIS OF Sb2S3 NEEDLES AND STUDY OF THE EFFECT OF THEIR INTERGROWTH ON THEIR OPTICAL PROPERTIES
Authors:   Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Av. Universidad S/N, Cd. Universitaria. San Nicolás de los Garza, Nuevo León, 66455 México, GUTIÉRREZ-GARZA O. E. , GARZA-TOVAR L. L. ,   Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Av. Universidad S/N, Cd. Universitaria. San Nicolás de los Garza, Nuevo León, 66455 México, QUIROGA-GONZÁLEZ E. ,   Institute of Physics, Benemérita Universidad Autónoma de Puebla. San Claudio and 18 Sur, Building IF-1, Ciudad Universitaria. 72570 Puebla, México, GARCÍA GÓMEZ N. A. ,   Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Av. Universidad S/N, Cd. Universitaria. San Nicolás de los Garza, Nuevo León, 66455 México, PEÑA-MENDEZ Y. ,   Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Av. Universidad S/N, Cd. Universitaria. San Nicolás de los Garza, Nuevo León, 66455 México, SÁNCHEZ CERVANTES E. M. ,   Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Av. Universidad S/N, Cd. Universitaria. San Nicolás de los Garza, Nuevo León, 66455 México
Published: February 2023

Antimony trisulfide (Sb2S3) was successfully synthesized by the solvothermal route using either inorganic SbCl3 or organic C8H10K2O15Sb2 antimony precursors, and carbon disulfide as sulfur precursor with ethylene glycol as the solvent. The use of SbCl3 resulted in single needles, while C8H10K2O15Sb2 conducted to needle-bundles. In both cases, the crystal structure is orthorhombic (Stibnite), as a single phase. The introduction of structural defects caused by the intergrowth is evidenced by Raman spectroscopy. The defects originate a variation of the optical bandgap of the material.
STUDY ON PREPARATION AND PROPERTIES OF PVA/AgNPs COMPOSITE NANOFIBER MASK MATERIAL
Authors:   School of Textiles, Henan University of Engineering, Zhengzhou 450007, China, XIANHUA Z , XIANGWEI F. ,   School of Textiles, Henan University of Engineering, Zhengzhou 450007, China, BIN Y. ,   School of Textiles, Henan University of Engineering, Zhengzhou 450007, China, FAN L. ,   College of Textiles, Zhongyuan University of Technology, Zhengzhou 450007, China, LINA C. ,   School of Textiles, Henan University of Engineering, Zhengzhou 450007, China, CENGCENG Z. ,   School of Textiles, Henan University of Engineering, Zhengzhou 450007, China
Published: February 2023

In this paper, the preparation and properties of polyvinyl alcohol (PVA)/silver nanoparticles (AgNPs) composite nanofiber mask material were studied. Firstly, PVA spinning solution was prepared, and PVA nanofibers with different mass fractions (5 wt%, 7 wt%, 8 wt%, 9 wt% and 11 wt%) were prepared by electrospinning technology. The morphology of PVA nanofibers was observed under electron microscope, and the results showed that 8 wt% PVA nanofibers had the best morphology. AgNPs with different mass fractions (0.02 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt% and 0.06 wt%) were dispersed in pure water and blended with 8 wt% PVA solution to prepare PVA/AgNPs composite nanofibers by electrospinning. The effects of different mass fractions of AgNPs on the morphology of PVA/AgNPs composite nanofibers were analyzed. Infrared spectroscopy and X-ray diffraction were used to test the PVA/AgNPs composite nanofibers. PVA/AgNPs composite nanofiber mask fabric was prepared by using activated carbon nonwoven fabric as substrate. The filterability, air permeability and moisture permeability of PVA/AgNPs composite nanofiber mask material were tested and analyzed. The result showed that PVA/AgNPs composite nanofiber mask material has good filtration, moisture permeability and air permeability, and has broad application prospects.
EFFECT OF La2O3 DOPING ON DIELECTRIC PROPERTIES OF BaZr0.1Ti0.9O3CERAMICS BY SOL-GEL METHOD
Authors:   College of Science, North China University of Science and Technology, Tangshan 063210, China, ZHAO H. , ZHOU R. ,   College of Materials Science and Engineering, North China University of Science and Technology, Tangshan 063210, China, BO H. ,   College of Science, North China University of Science and Technology, Tangshan 063210, China
Published: February 2023

Lanthanum doped BaZr0.1Ti0.9O3 (BZT10) dielectric ceramics were prepared by sol-gel method using barium acetate, zirconia nitrate, butyl titanate and La2O3, etc, as raw materials and La2O3 as dopant, the effects of La2O3 doping on dielectric properties of BaZr0.1Ti0.9O3 ceramics are also investigated. The XRD results show that the crystal structure for BZT10 ceramics is a single perovskite structure, and the admixture of La3 + does not generate new phase. With the increase of La2O3 content, the grain size decreases continuously when the doping amount x ≤ 0.5 mol%, when the doping amount x > 0.5 mol%, the grain size basically remains unchanged, and the grain size is uniform. With the La2O3 content increasing, the dielectric constant rises at first and then decreases for the samples sintered at 1280 oC, 1300 oC and 1330 oC, when the sintering temperature is 1280 oC and the La2O3 doping amount is x = 0.7 mol%, the dielectric constant is the largest. It can also be seen that the dielectric loss of La3+ -doped sample is lower than that of the blank sample in the temperature range from room temperature to 125 C. In the terms of dielectric constant, dissipation factor and temperature stability for dielectric loss, the trace amount of La3+ doping could influence the dielectric properties remarkably
REFINEMENT ANALYSIS, PHOTOLUMINESCENCE AND MAGNETIC PROPERTIES OF Zn1-XMnXO (x = 0.00, 0.01, 0.02, 0.03 & 0.04) NANOPARTICLES SYNTHESIZED BY COMBUSTION TECHNIQUE
Authors:   Department of Physics, Sri Venkateswara University, Tirupati- 517502, India, MUNIRAJA P. , KUMAR K. S. ,   Department of Physics, Sri Venkateswara University, Tirupati- 517502, India, SUDHARANI A. ,   Department of Physics, Sri Venkateswara University, Tirupati- 517502, India, RAMANADHA M. ,   Department of Physics, Sri Venkateswara University, Tirupati- 517502, India, RAMU S. ,   Department of Physics, Sri Venkateswara University, Tirupati- 517502, India, VIJAYALAKSHMI R. P. ,   Department of Physics, Sri Venkateswara University, Tirupati- 517502, India, POORNAPRAKASH B. ,   Department of Electronic Engineering, Yeungnam University, Gyeongsan38541, South Korea
Published: February 2023

Zn1-XMnXO (x = 0.0, 0.01, 0.02, 0.03 & 0.04) nanoparticles were fabricated through a simple combustion method and their structural, morphological, chemical, optical, photoluminescence and magnetic properties were systematically analyzed. X-ray diffraction (XRD) and Rietveld refinement (RR) analysis studies divulged that, the synthesized nanoparticles exhibited the hexagonal structure without any impurity phase. Morphology studies revealed that the synthesized nanoparticles were nearly spherical in shape with uniform size distribution. A clear Blue shift was recognized in the ZnO nanoparticles when doped with Mn ions. The photoluminescence (PL) spectra of all the synthesized nanoparticles exhibited the same emissions and PL intensity diminished with increase in Mn doping concentration. All the synthesized nanoparticles exhibited room temperature ferromagnetism (RTFM) and Zn1-XMnXO(x=0.02) nanoparticles displayed better ferromagnetic property than other compositions. The captivate properties of the ZnO: Mn nanoparticles may more useful for optoelectronic and spintronic applications.
SYNTHESIS, THERMAL, ELECTRICAL AND MAGNETIC PROPERTIES OF Bi0.6-xMn0.5Ni0.5Fe2O4 FERRITE
Authors:   Department of Chemistry, The Islamia University of Bahawalpur,63100, Pakistan, ALI M. , AKRAM M. ,   Department of Educational Training, The Islamia University of Bahawalpur,63100, Pakistan, ZAFAR IQBAL S. M. ,   Department of Educational Training, The Islamia University of Bahawalpur,63100, Pakistan, ASHFAQ M. ,   Department of Electrical Engineering, Khawaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan
Published: February 2023

A series consisting of six samples of Bi0.6-xMn0.5Ni0.5Fe2O4 spinel ferrites with different molar concentrations have been fabricated by using the facile co-precipitation method. (x= 0.0, 0.10, 0.20, 0.30, 0.40 and 0.50). The synthesized series structural properties and phase information are studied using XRD. FESEM is used to explore the surface morphology and EDS is used to characterize the composition of elements in the nanoparticles. Raman Spectroscopy of the synthesized samples confirms the five Raman active bands Raman spectra i.e. A1g, Eg, and three belongs to T2g. These five peaks are at 200, 318, 477, 560, and 684 cm-1 indicates the successful confirms the formation of Bi0.6- xMn0.5Ni0.5Fe2O4 cubic nanoparticles. The vibrating sample shows a superparamagnetic character in magnetometry measurements. As the concentration of Bi is increased the saturation magnetization decreases from the value 82 emu/g. The graphs of TGA and DTA analysis showed weight losses with the rise in temperatures but no further weight loss was observed after 800°C and limits at 950°C. The dielectric measurements were performed between frequency ranges of 1MHz to 3GHz of the applied electric field. The dielectric parameters were observed to decrease by Bi substitutions whereas the particle size increases. This decreasing effect remains to continue by increasing the frequency. However, the resistance of the nanocomposite material is found to decrease. These dielectric parameters suggest that these nanocrystalline ferrites with the domino effect are suitable for microwave devices of GHz frequencies ranges.
MICROSTRUCTURAL, THERMAL AND WEAR BEHAVIOR OF YSZ/Al2O3 THERMAL BARRIER COATINGS FOR GUN BARREL APPLICATIONS
Authors:   Assistant Professor, Department of Mechanical Engineering, Sri Ramakrishna Engineering College, Coimbatore 641 022, India, RAMESH M. , MARIMUTHU K. ,   Professor, Department of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore 641 014, India
Published: February 2023

The present study aims to investigate the performance of Yttria Stabilized Zirconia and Alumina Thermal Barrier Coatings deposited on EN steel substrates used in gun barrel through Atmospheric Plasma Spray Process. Chemical compositions of the EN steels (EN8, EN19, EN24 and EN36C) as well as the particles were examined prior to the coating process. Atmospheric Plasma Spray Process was carried out using carrier gas with two different flow rates of 3 and 4scfh. A bond coat was made for 50 µm by depositing NiCrAlY and the top coats were made for 200 µm distinctly using Yttria Stabilized Zirconia and Alumina. X-ray Diffraction and Field Emission Scanning Electron Microscope examination were performed on the coated specimens to observe the phase and morphology respectively. Thermal testing and Infrared thermal imaging were performed to measure the insulation performance and spallation performance under different exposure time (upto 20 minutes) for the input temperature of 200˚C. Wear and scratch test were conducted on the specimens to determine the coating integrity as well as bonding of top and bond coat to substrate. YSZ coated EN36C steel produced under carrier gas flow rate of 3scfh possessed greater insulation performance compared to all other steels. Also, YSZ coated EN36C steel has better wear and scratch resistance indicating lesser deformation compared to other materials.
Acompanhamento dos recém nascidos de risco de uma Unidade Básica de Saúde de Maringá-PR
Authors: Lima Lopes Mislaine Casagrande de , Santander Claudia Aparecida , Marcon Sonia Silva
Published: February 2023

Estudo descritivo documental, que objetivou caracterizar a população de recém-nascidos considerados de risco, de uma Unidade Básica de Saúde (UBS) e verificar se e como estas crianças tem sido acompanhadas pelas equipes da Estratégia Saúde da Família. Os dados foram coletados em uma unidade básica de saúde, em junho/2007, a partir de consulta a 25 fichas de recém-nascidos de risco e prontuários. Os principais fatores que geraram risco aos bebês foram: a prematuridade, o baixo peso e a baixa idade materna. A maioria das crianças não foi submetida a uma consulta mensal. Observou-se número reduzido de informações referentes a antecedentes familiares, estado vacinal, gestação, parto e história alimentar da criança. Considerou-se que a existência dos fatores de risco entre mães acima de 17 anos pode estar associado a problemas pré e perinatais. A busca de crianças faltantes deve ser realizada pelos profissionais, as anotações em prontuário precisam ser mais completas.
Banco de termos da linguagem especial de enfermagem de um hospital escola
Authors: Nóbrega Maria Miriam Lima da , Garcia Telma Ribeiro , de Medeiros Ana Claudia Torres , Lima de Souza Gabriela Lisieux
Published: February 2023

Pesquisa descritiva desenvolvida com o propósito de unificar as pesquisas desenvolvidas nas clínicas do Hospital Universitário Lauro Wanderley da UFPB, objetivando a construção de um Banco de Termos da Linguagem Especial de Enfermagem. Para atendimento ao objetivo do estudo foram feitas a identificação e avaliação do conjunto de termos da linguagem especial de enfermagem; o mapeamento dos termos identificados nas clínicas com os constantes na Classificação Internacional para a Prática de Enfermagem (CIPE®) Versão 1.0; e a compilação das definições para os termos classificados como constantes nos eixos dessa classificação, os quais constituíram o Banco de Termos da Linguagem Especial de Enfermagem. Acredita-se que é necessária a continuidade deste estudo para que se analisem os termos não constantes na CIPE® e seja feita a validação de todos os termos contidos no banco de termos, de forma que permita a sua utilização no desenvolvimento de afirmativas de diagnósticos/resultados e intervenções de enfermagem.
Desvelando o processo de morrer na adolescência: a ótica da equipe de enfermagem
Authors: Moro Cristiane Rossi , Almeida Inez Silva de , Deusdará Rodrigues Benedita Maria Ego , Ribeiro Iris Bazílio
Published: February 2023

Acompanhar o morrer na adolescência foge aos padrões da vida, mesmo para a equipe de saúde que lida rotineiramente com essa realidade. Neste contexto, o estudo teve como objetivo compreender o significado do processo de morrer na adolescência na ótica da equipe de enfermagem. O referencial metodológico utilizado foi a fenomenologia e os sujeitos foram seis técnicos e quatro enfermeiros. Os resultados evidenciaram quatro categorias. Ao ver o adolescente morrendo, os profissionais: vivenciam a impotência; apoiam-se na crença; colocam-se como familiar; expressam dificuldade em aceitar a morte do adolescente. Conclui-se que os profissionais de enfermagem, diante da realidade da morte de adolescentes, experienciam questões existenciais. Há necessidade de inovações a partir das discussões e reflexões acerca do cuidado do ser adolescente frente à morte e ao morrer. É fundamental que a equipe de enfermagem se aproprie dessa temática, se instrumentalizando técnica e emocionalmente para cuidar do ser em sua finitude.
Levantamento dos casos de traumatismo ocular num hospital de emergência
Authors: Lima Maria Alzete de , Freitag Pagliuca Lorita marlena , Almeida Paulo César de , Andrade Luciene Miranda de , Caetano Joselany Áfio
Published: February 2023

Os objetivos do estudo foram estimar a incidência e identificar os tipos de traumas e as circunstâncias relacionadas ao evento dos pacientes atendidos em um serviço de emergência oftalmológica, Ceará, Brasil. Estudo descritivo, quantitativo, realizado com 845 vítimas de traumas. Foram avaliados: sexo, idade, procedência, causa e tipo de trauma. Coleta de dados por meio de formulário e do livro de ocorrência. O sexo masculino, 663(78,5%), foi mais suscetível aos traumas oculares, causados por corpo estranho, 321(40,89%), e acidente de trânsito, 147(18,73%). No sexo feminino prevaleceu o acidente doméstico, 49(40,2%). A maioria pertencia à faixa etária de 20 a 29 anos de idade, 196(25,0%), e procedente da capital, 530(67,5%). O ferimento perfurante foi o principal tipo de trauma. Diante da magnitude do problema, tornam-se importantes medidas de promoção em saúde com vistas à prevenção dos traumatismos oculares.
Table of Contents
Authors: Table of Contents ToC
Published: February 2023

*
Patient Satisfaction Improvement by Comprehensive Holistic Services at Public Health Centre X Surabaya
Authors: Wartiningsih Minarni , Silitonga Hanna Tabita Hasianna , Ritunga Imelda , Prayogo Michelle Christina , Wijaya Evelyn Danielle
Published: February 2023

Comprehensive holistic health services are a form of improving the quality of health services by measuring IKM. The result of a survey by BPJS Kesehatan is that the IKM has not reached targeted satisfaction in 2016 and 2017. Public Health Center X has an index value that exceeds the existing IKM target, but the index value is lower than the index value in 2016. This study will analyze the decrease in the satisfaction index of BPJS participants towards First-Level Healthcare Facilities (FKTP). Then the low satisfaction index of BPJS participants getting their treatments in Public Health Center X. The study aims to understand the relationship between comprehensive holistic service and the satisfaction of outpatients at Public Health Center X. The research was an analytical observational study with a cross-sectional design. The samples obtained in this study were 242 respondents. The data were next processed using the PLS-SEM application. The results show that comprehensive holistic services affect satisfaction (t=7.983). The holistic service affects loyalty (t=6.112). The customer value affects satisfaction (t=2.155) and loyalty (t=3.527). Satisfaction affects loyalty (t=4.488). This research concludes that comprehensive holistic service and customer value affect satisfaction and loyalty. In addition, satisfaction has a direct effect on loyalty.
Spatial Distribution of Drug-Resistant Tuberculosisin Makassar City, South Sulawesi Province, Indonesia
Authors: Zainuddin Andi Alfian , Soma Andang Suryana , Kasim Muhammad Firdaus , Ramadany Sri , Djaharuddin Irawati
Published: February 2023

This study aims to determine the domicile distribution, find out the high-risk areas, and determine the risk of drug-resistant tuberculosis patients based on patient location in 15 districts of Makassar City from Tuberculosis register data of South Sulawesi Provincial Health Office in December 2017 – April 2019 period. Gen Xpert rapid or drug sensitivity examinations were used to define drug-resistant tuberculosis. The domicile location of patients was geocoded by maps in Google Earth and aggregated per area by using Kernel Density analysis using ArcView GIS 10.3 software. We found that drug-resistant tuberculosis cases tended to be clustered in the western part of Makassar City, an area with a fairly high population density. There were areas with the highest concentration of predicted cases as a high risk of transmission of drug-resistant TB, around the Bontoala District, Makassar District, and Mamajang District. Healthcare facilities located in hot spots area need to be equipped with molecular rapid test facilities and conduct drug sensitivity tests for all suspected tuberculosis patients. Further research needs to be carried out to determine the distribution of tuberculosis patients who are sensitive and resistant to drugs.
Elementos, transformaciones y estrategias que intervienen en la adaptación universitaria desde la mirada de estudiantes regulares y de primer de ingreso de la Universidad Nacional
Authors: Valverde Lopez Lizeth , Álvarez Vega Nathalie , Bogantes Sánchez Joseline
Published: February 2023

This paper collects the perceptions of first-year and advanced college students at Universidad Nacional (UNA) of Costa Rica. The main objective of the inquiry was to identify the elements and transformations that are involved in the adaptation of college students to demonstrate strategies to promote success in the adaptation process to the college life from the student’s perspective. This study has been done based on Participatory Action Research with 14 students at UNA in synchronous and asynchronous meetings; the collected data were categorized through a writing process of four layers: literal transcription of the meetings and classification of the information, highlighting the data based on purposes, critical and reflective interpretation, as well as the link with the authors. It was found, among the main transformations experience, that supporting networks are key elements that take part in the adaptation to university life as well as knowing the university and its related concepts. Spaces for relief and support for first-year students were highly recommended according the obtained findings.
El paradigma de la complejidad en la gestión educativa de una escuela pública del cantón de Belén de Heredia
Authors: Solís Vargas Yors Guillermo
Published: February 2023

This paper has the general objective to analyze the implementation of the complexity paradigm, which is proposed by the Educational Policy of Costa Rica in the administration of a public school in the canton of Belén, Heredia. The type of investigation was developed from a qualitative approach and the hermeneutic-dialectic method. The triangulation was applied for the analysis of the results to interpret the collected data of the Complexity theory, the educational policy, and the gathered data of the interviewed applied to the management person. Among the major results, it can be emphasized that the principal broadly implements the complexity paradigm although he does not know the concept. The less congruent point was identified during the interdisciplinary work although it was concluded that this does not necessarily depend on the administrative labor; therefore, among the recommendations to principal of the school, it was encouraged to request training and to promote and create spaces for the articulated job among the different disciplines of the institution. Regarding the Ministry of Public Education (MEP in Spanish), it is suggested to reorganize the national curriculum more integrally and to reformulate the programs in a more transdisciplinary articulation.
Valoración de una experiencia evaluativa virtual sincrónica en los aprendizajes de Física para promover la honestidad académica estudiantil en la Universidad Estatal a Distancia, 2020-2022
Authors: Herrero-Villarreal Diana , Sanchez Rosita Ulate , Calderón Badilla Yency
Published: February 2023

The purpose of this study was to assess the actions taken by the Physics Chair of the Exact and Natural Sciences of the Distance State University of Costa Rica regarding the implementation of evaluative activities which promote academic honesty, using an oral test with a virtual and synchronous format in a subject. Therefore, research was carried out with a qualitative approach, a narrative design and with a descriptive scope. The period of analysis covered the three academic quarters of the years 2020-2021, as well as the first quarter of 2022. Likewise, a group session was held with all the teachers who participated in the subject of Physics during the study period to find their perceptions about the evaluation activity in such a way that, based on these results and the advantages and disadvantages mentioned, adjustments were made in the synchronous oral test as part of a continuous improvement in the applied evaluation. In addition, the main conclusions show that the application of the virtual synchronous evaluation strategy encourages collaborative work and promotes academic honesty.
Revisión bibliográfica de la comprensión lectora en personas adultas estudiantes: insumos para la educación distancia en Costa Rica
Authors: Poltronieri Méndez Sarita
Published: February 2023

Reading comprehension is of the utmost importance in distance education since the written text still remains the prevailing way to transmit information in classes. The purpose of this paper is to describe the way in which reading comprehension of adult learners, especially university students, is documented through a literature review to generate helpful inputs for decision making in distance education in Costa Rica. A systematic literature review was carried out in three stages, which included a review protocol, Boolean operators use (AND + / OR = / NOT -), inclusion and exclusion document criteria, as well as four databases to search documents. The main finding shows that there is no official measurement unit or agreement on a parameter for reporting reading comprehension. Its measurement is done using percentages, words per minute (X̅=183,05 ± 68,92) and other indicators (statistics). Therefore, it was concluded that the actual reading comprehension capacity in distance education students is yet unknown in Costa Rica, and that it is necessary to make use of more than one input to determine reading comprehension. Also, it is necessary to explore the use of information and communication technologies (ICT) for a more assertive collection of adult reading comprehension data.
Fundamentos psicológicos, socioculturales y afectivos que propicien una educación liberadora y creadora
Authors: D’Antoni Fattori Maurizia , Gómez Ordóñez Luis
Published: February 2023

This essay seeks to put psychological, sociocultural, and affective elements in a dialogue, starting from what has been learned from educational challenges as revealed by the research of the Program Alfabetización Crítica of the Universidad Nacional, Costa Rica, also analyzing what happened in the pandemic period with distance learning in Latin America. The manifestation of asymmetric power relations and the absence of youth cultures in educational centers are striking and impose a proposal for a liberating education.
La educación zapatista como alternativa al modelo neoliberal
Authors: Landeros Belmont Roberto Luciano
Published: February 2023

This essay aims to reflect on the negative effects that neoliberalism and the search for modernity have left on Latin American education, as well as the influence of social movements which, to combat the predatory effects of capitalism, have constituted a critical pedagogy linked to an education of the people, with special attention to Zapatista education, which in its struggle for a just, democratic, and free society by designing an educational system derived from critical pedagogy as an alternative to the dominance of a neoliberal education.
Romanian dental students’ learning experience related to lifestyle changes imposed by Covid-19 lockdown
Authors: Bud Marius , Pricope Razvan , Pop Razvan , Korkut Bora , Lucaciu Ondine , Cimpean Sanda , Delean Ada
Published: February 2023

Background and aim. The SARS-CoV-2 outbreak in Romania was followed by the declaration of an Emergency State and the subsequent lockdown. As all the schools and universities ceased onsite activities, the teaching process continued exclusively online, on different platforms, such as Microsoft Teams or Zoom.

Objectives. The aim of this cross-sectional study is to evaluate how the lifestyle changes imposed by the Covid-19 lockdown and online lectures influenced the learning experience of Romanian dental students, as their point of view could bring new information which might contribute to improving the teaching process.

Methods. The questionnaire had 28 items, each with either a Likert Scale or a multiple-choice option and was distributed in April 2020, one month after implementation of circulation restrictions and social distancing.

Results. Compared to classical teaching, we found that the online teaching process had a lower efficiency, with a higher satisfaction level for online courses, but lower for online practical teaching activities. The absence of human interaction was found to be detrimental to the teaching process.

Conclusion. Despite the lower efficiency of online learning, it was a good alternative that helped students continue their education in the situation created by the outbreak of Covid-19. For higher learning efficiency, a compromise method consisting of online courses and onsite practical training could be a better alternative.
The Late Lithuanian Greimas: Intentions and Reception
Authors: Mačianskaitė Loreta
Published: February 2023

The main research material consists of Algirdas Julius Greimas’s texts written during the transition period, when Lithuania was parting with Soviet rule (1989–1991), mainly his “Baltos lankos” column in Literatūra ir menas weekly periodical as well as various texts by other authors on Greimas’s texts along with memoirs, letters and obituaries. The study has two aims: 1) to find a conceptual approach for analyzing Lithuanian texts by the late Greimas, 2) to identify points of change in the semiosphere of Lithuanian culture. Greimas’s own semiotic method, namely, a structure of four Senders is used to describe his texts. The theoretical context of Juri Lotman’s cultural semiotics is a more permanent intellectual context for this study, and some of the terms are useful in more than one aspect. The readers’ attitudes towards Greimas’s texts highlight how the core and periphery change in the semiosphere: the period of cultural activity and openness and the internal cultural barriers appearing at the same time, the gradual passivation of culture and cases of sporadic creative relationships.
ВИКОРИСТАННЯ ФРУКТОВОЇ СИРОВИНИ ЯК ДЖЕРЕЛА ОРГАНІЧНИХ КИСЛОТ У ТЕХНОЛОГІЇ ДРІБНОШМАТКОВИХ М'ЯСНИХ НАПІВФАБРИКАТІВ
Authors: Бородай Анжела Б. , Горобець Олександра М. , Хомич Галина П. , Левченко Юлія В. , Мацук Юлія А.
Published: February 2023

Мета. Дослідити вплив органічних кислот соків фруктової сировини на стабільність мікрофлори; розробити рецептури шашлику на основі фруктового маринаду. Методи. Для дослідження використовувалися стандартні методи аналізу. Якість готової харчової продукції контролювали за органолептичними, фізико-хімічними та мікробіологічними показниками. Результати експериментальних досліджень піддавали статистичній обробці за допомогою стандартних програмних пакетів Microsoft Office. Результати. У роботі досліджено вміст біологічно активних речовин резистентної дії (органічні кислоти, фенольні й пектинові сполуки та ін.) у складі фруктових соків. Визначено якісний і кількісний вміст органічних кислот у фруктовій сировині та продуктах її переробки. Досліджено вплив органічних кислот фруктової сировини на мікробіологічні показники соків, пюре, маринадів на основі соків і встановлено позитивний вплив органічних кислот на формування технологічних властивостей напівфабрикатів і готових продуктів. Визначено, що використання фруктових соків (хеномелесу, журавлини) у технології дрібношматкових напівфабрикатів зі свинини та яловичини дозволяє не лише знизити мікробне забруднення, а й впливає на важливі споживчі властивості готового продукту. Висновки. Підтверджено доцільність використання соків хеномелесу та журавлини в технології маринування м’ясної сировини (свинини, яловичини) в процесі приготування шашликів. Впровадження запропонованої технології використання фруктових кислот дозволить розширити асортимент натуральних маринадів підвищеної біологічної цінності.
КОМПОЗИТНІ ЕЛЕКТРОЛІТИ НА ОСНОВІ ПОЛІВІНІЛІДЕНФТОРИДУ ДЛЯ ЛІТІЙ-ІОННИХ АКУМУЛЯТОРІВ
Authors: Уссіпбекова Єнлік Ж. , Сейлханова Гюльзія А. , Курбатов Андрій П. , Сулейменова Гюльнюр А.
Published: February 2023

У роботі синтезовано шість композиційних полімерних електролітів (КПЕ) зі складом PVDF-PEG-LiClO4-X та різними наповнювачами (де X = LiF, Ce2O3, Na2SO4, Li3PO4, MgO, LiH2PO4). Визначено оптимальний склад КПЕ та наповнювача PVDF-PEG-LiClO4-Li3PO4. Досліджено вплив концентрації наповнювача на іонну провідність плівок, де оптимальна концентрація наповнювача 5 % Li3PO4 має найвищу іонну провідність 1.4310-4 Ом-1·см-1. Морфологію поверхні, електрохімічну та термічну стабільність отриманих ЦПЕ досліджено різними методами.
ВОНА ЗАВЖДИ ПРАЦЮВАЛА З НАТХНЕННЯМ І ВМІЛА НАДИХАТИ ІНШИХ
Authors: С. Коваленко Валерій , О. Пальчиков Віталій , І. Оковитий Сергій , В. Стець Надія
Published: February 2023

Стаття присвячена 85-річчю від дня народження відомої вченої, професора, доктора хімічних наук, заслуженого діяча науки і техніки України Лілії Іванівни Кас’ян. Наводяться короткі біографічні відомості про вчену. Обговорюється тематика її наукових досліджень, розкривається зміст найважливіших наукових праць з хімії епоксидів, показано прикладне значення її теоретичних досліджень.
Особлива увага звертається на досвід роботи Л. І. Кас’ян з творчою студентською молоддю.
По следам дворцовой библиотеки
Authors: Toshov Nuryoghdi
Published: February 2023

The book is devoted to the bibliographical reconstruction and study of the court library of the Qongrat dynasty of Khorezm. Confiscated as a war trophy during the conquest of the Khanate of Khiva by Russian troops in 1873, the library was taken to the Russian Empire's capital, St Petersburg. The book consists of two parts: the first part discusses the nature and functioning of this court library, the political, social, and cultural background for the development of literature and book culture in the Khanate, the circumstances of the removal of manuscripts from Khiva and their subsequent transfer to Russian academic institutions, as well as methodological aspects of reconstructing the library. The second part contains descriptions of manuscripts identified as originating from this library.
Huerta Ramón, R. (2021). Cementerios para educar. Madrid, McGraw-Hill, 236 pp.
Authors: Ramón-Verdú Alfredo-José
Published: February 2023

Book Review
14 Years On: A Clinical Case Report of an 86-Year-Old Patient With Full Arch Implant-Supported Restorations With Auro Galvano Crown Attachments
Authors: Takeshita Kenji , Taninokuchi Hiromi , Naito Yoshihito , Takahashi Tetsu
Published: February 2023

Oral reconstruction in fully edentulous patients can be challenging at times. Hence, it is important to offer the most suitable treatment option after a detailed clinical examination and treatment plan. This 14-year long-term follow-up report is the clinical case of a 71-year-old nonsmoker who visited the clinic in 2006 and opted for full-mouth reconstruction using Auro Galvano crown (AGC) attachments. Maintenance was performed twice a year for the past 14 years, and the clinical results were satisfactory, with no signs of inflammation or lack of retention of the superstructures. This was associated with a high level of patient satisfaction, as indicated by the Oral Health Impact Profile. Compared to the screw-retained implants over dentures, AGC attachments can be a viable and effective treatment option when restoring fully edentulous arches.
Three-Dimensional Evaluation of Autogenous Ramus Block Graft Donor Site and Its Relation to Mandibular Canal
Authors: Ataman-Duruel Emel Tuğba , Erduran Nazan Ece , Duruel Onurcem , Cicciu Marco , Tözüm Tolga Fikret
Published: February 2023

Sufficient bone volume is necessary for placing a dental implant in an ideal position. To restore severely insufficient bone volume, autogenous block graft procedures with various intraoral donor sites are presented in the literature. The aims of this retrospective study are to present the dimensions and volume of the potential ramus block graft site, and to evaluate possible effect of mandibular canal diameter and its position in relation to mandibular ramus block graft volume. Two-hundred cone-beam computed tomography (CBCT) images were evaluated. The maximum length, width, height, and volume of the potential ramus block graft site, mandibular canal diameter, mandibular canal–mandibular basis distance, and mandibular canal–crest distance were measured. Mandibular canal diameter, mandibular canal–crest distance, and mandibular canal–mandibular basis distance were 3.139 ± 0.446 mm, 15.376 ± 2.562, and 7.834 ± 1.285 mm, respectively. In addition, the dimensions of the potential ramus block graft sites were measured 11.156 ± 2.297 mm × 10.390 ± 3.420 mm × 8.816 ± 1.720 mm (height × length × width). Moreover, the potential ramus bone block volume was calculated as 1.076 ± 0.398 cm3. While a positive correlation was detected between mandibular canal–crest distance and the potential ramus block graft volume (r = .160, P = .025), a negative correlation was found between mandibular canal–mandibular basis distance and the potential ramus block graft volume (r = −.020, P = .001). Mandibular ramus is one of the predictable intraoral donor sites for bone augmentation procedures. However, ramus has some volumetric limitations related to its neighboring anatomic structures. It seems to be important to evaluate lower jaw in a 3-dimensional manner to prevent surgical complications.
Mechanical Resistance of a 2.9-mm-Diameter Dental Implant With a Morse-Taper Implant-Abutment Connection
Authors: Alberti Alice , Corbella Stefano , Francetti Luca
Published: February 2023

Among the complications that can occur at dental implants, the fracture of any implant component is a relatively infrequent but clinically relevant problem. Because of their mechanical characteristics, small diameter implants are at higher risk of such complication. The aim of this laboratory and finite element method (FEM) study was to compare the mechanical behavior of a 2.9- and 3.3-mm-diameter implant with a conical connection under standard static and dynamic conditions, following the International Organization for Standardization (ISO) 14801:2017. Finite element analysis was performed to compare the stress distribution on the tested implant systems under a 300-N, 30° inclined force. Static tests were performed with a load cell of 2 kN; the force was applied on the experimental samples at 30° with respect to the implant-abutment axis, with an arm of 5.5 mm. Fatigue tests were performed with decreasing loads, at 2-Hz frequency, until 3 specimens survived without any damage after 2 million cycles. The emergence profile of the abutment resulted the most stressed area in finite element analysis, with a maximum stress of 5829 and 5480 MPa for 2.9- and 3.3-mm-diameter implant complex, respectively. The mean maximum load resulted in 360 N for 2.9-mm-diameter and 370 N for 3.3-mm-diameter implants. The fatigue limit was recorded to be 220 and 240 N, respectively. Despite the more favorable results of 3.3-mm-diameter implants, the difference between the tested implants could be considered clinically negligible. This is probably due to the conical design of the implant-abutment connection, which has been reported to present low stress values in the implant neck region, thus increasing the fracture resistance.
A Socket Seal Technique With the Use of Autologous Dental Roots for Socket Seal: A Case Series
Authors: Chang Chung-Chieh , Lin I-Ping , Mei Chih-Chun , Tang Pei-Zhen , Hong Hsiang-Hsi
Published: February 2023

The literature identified variations in socket seal surgery, each with limitations. This case series aimed to observe the outcome of using autologous dental root (ADR) for socket sealing on socket preservation (SP). A total of 9 patients with 15 extraction sockets were documented. After flapless extraction, the xenograft or alloplastic grafts were placed in the sockets. Autologous dental roots were prepared extraorally and applied to seal the socket entrance. All SP sites healed uneventfully. Cone-beam computed tomography (CBCT) scan was performed after 4–6 months of healing to evaluate ridge dimensions. The preserved alveolar ridge profiles were verified on CBCT scans and during implant surgery. Implants were placed successfully with a reduced need for guided bone regeneration. Histological biopsy specimens were examined in 3 cases. The histological examination demonstrated vital bone formation and osseointegration of graft particles. All patients completed the final restorations and were monitored for 15.56 ± 9.08 months after functional loading. The favorable clinical outcomes support the use of ADR for SP procedures. It was not only accepted to patients but also easy to perform with low complication rates. The ADR technique is thus a feasible method for socket seal surgery.
Vertical and horizontal ridge augmentation using customized three-dimensionally printed polycaprolactone mesh in atrophic posterior maxillae: a case report
Authors: Park Jin Young , Jeon Su-Hee , Lee Joo-Yeon , Park Ji-Man , Cha Jae-Kook
Published: February 2023

Polycaprolactone has exhibited expediency as a biomaterial for bone regenerative procedures preclinically. The present report of the two clinical cases in the posterior maxilla is the first to describe clinical application of a customized 3D printed polycaprolactone mesh for alveolar ridge augmentation. Two patients needing extensive ridge augmentation procedures for dental implant therapy were selected. Polycaprolactone meshes were virtually designed, 3D printed and applied in combination with a xenogeneic bone substitute. Cone-beam computed tomography was taken pre-operatively, immediately after the surgery, and 1.5 to 2 years after the delivery of implant prostheses. The serial cone-beam computed tomography images were superimposed to measure the augmented height and width at 1 mm increments from the implant platform to 3 mm apically. After 2 years, the mean [maximum, minimum] bone gain was 6.05 [8.64, 2.85] mm vertically and 7.77 [10.03, 6.18] mm horizontally at 1 mm below the implant platform. From immediately postoperative to 2 years, there was 14 % reduction of augmented ridged height and 24 % reduction of augmented width at 1 mm below the platform. All implants placed in augmented sites were successfully maintained until 2 years. The customized Polycaprolactone mesh might be a viable material for ridge augmentation in the atrophic posterior maxilla. This needs to be confirmed through randomized controlled clinical trials in future studies.
Guided Lateral Window Osteotomy Using Dynamic Navigation for Maxillary Sinus Augmentation: A Novel Technique
Authors: Bishbish Omran , Kan Joseph , Kim Yoon Jeong
Published: February 2023

The size and the position of the sinus antrostomy play a key role in making sinus grafting surgery more predictable and effective with less complications. A cone beam computed tomography and intraoral scan of the maxilla were taken for a patient who is missing maxillary first molar tooth with limited residual bone. Data were exported to the dynamic navigation (DN) system software. Sinus lateral window osteotomy position and dimensions were determined and planned using four 1.5 mm diameter implants placed on the maxillary sinus lateral wall. The osteotomy was initiated following the planned four 1.5 mm implants in a parallel motion to the bone surface using dynamic navigation guidance; thus, creating an outline for the lateral sinus window. Afterword's, the lateral sinus window was greenstick fractured and the membrane was lifted; first molar implant osteotomy done, implant placed, and bone graft material was placed. The flap was sutured, and post-operative instructions and medications were given. No post-operative complications noticed. The outline of the lateral window osteotomy along with implant osteotomy can be accurately planned and executed using DN technology, which may potentially reduce complications and insure accurate placement of the implant and the graft.
Displacement of a dental implant into the submandibular space: Complication of an immediate placement
Authors: Ozgul Ozkan , Odabaşı Fatih , Derdiyok Ugur , Kocyigit Doruk
Published: February 2023

not required as it is a case letter
EXPERIMENTAL AND NUMERICAL ANALYSIS FOR MODIFICATION OF SEPARATED BOUNDARY LAYERS OVER NREL'S S822 USING BLOWING/SUCTION TECHNIQUES
Authors: Aldabash Nazar , Azzawi Itimad D. J. , Al-Samari Ahmed
Published: February 2023

The majority of wind turbine models are built to work in areas with high wind speeds. Such turbines would waste a lot of the energy available in low-speed zones. The performance of these turbines should be improved using sophisticated techniques in order to match the locations' available wind energy. Therefore, in the current study, active flow control (AFC) was applied over the NREL S822 profile (small horizontal wind turbine) using blowing/suction techniques to determine where these methods will be most effective. At a constant speed of 15.8 m/s and an angle of attack of 18 deg, blowing and suction techniques have been used either together or individually. The results showed that the use of the NREL S822 aerofoil with AFC enhances the wind turbine performance by an average of 15% compared to using no AFC. It was discovered that the technique at the B3 (x/c = 0.54) slot was the best blowing technique, and the technique at the S1 (x/c = 0.18) slot was the best suction case and the maximum lift-to-drag ratio (CL/CD) when S1B3 was activated, indicating that S1B3 is the best technique with an 87% improvement rate.
Planning and design of the Gordie Howe International Bridge, North America
Authors: Martin Leslie A. , Yousif Zaher , Campbell Bruce L. , Furrer Martin , Chynoweth Matt
Published: February 2023

The Gordie Howe International Bridge project is providing a new modern border crossing between Windsor, ON, Canada and Detroit, MI, USA. The centrepiece of the project is a 2.5 km long cable-stayed bridge with 853 m main span over the Detroit River and 220 m tall towers on both sides of the river. In addition to the bridge, the project includes ports of entry on both sides of the border and a new freeway interchange with Interstate-75 in Detroit. The project was procured as a public–private partnership that allowed the proponents to propose either a suspension or cable-stayed bridge, with the ultimate selection creating the longest cable-stayed bridge in North America. The paper outlines the need for the new border crossing and results of the environmental assessment process, as well as describing the project evolution from planning through procurement and into detailed design. The scoping of the bridge design parameters is discussed, including: comprehensive geotechnical investigation; load study to develop project-specific live loading; the approach for durability requirements to achieve a service life of 125 years; special considerations for security; wind engineering; and compliance with both Canadian and US design codes. The paper also discusses the approach to achieving an aesthetically pleasing bridge design.