bluuebunny/crossref_metadata_2025 huggingface dataset:
Organizational, legal and economic problems of the functioning of the hotel and restaurant business in the context of COVID-19.
Authors:   Donetsk National University of Economics and Trade named after Mykhailo Tugan-Baranovsky, Nikolaichuk Olga , Gerasymenko Katerina ,   Donetsk National University of Economics and Trade named after Mykhailo Tugan-Baranovsky, Shulzhenko Ihor ,   Donetsk National University of Economics and Trade named after Mykhailo Tugan-Baranovsky
Published: August 2023

This paper highlights current economic and organizational and legal issues in the context of the COVID-19 pandemic for accommodation and catering entities affected by quarantine restrictions. The indicators of activity of domestic enterprises of the hospitality industry for 2010-2019 are analyzed. The low efficiency of activity for the majority of small business entities is established. The working conditions of enterprises in modern quarantine realities are considered. The world experience of business support in the leading countries of the world is studied and the presence of significant financial support from the government of the respective countries is established. Necessary measures during quarantine restrictions and possible ways to effectively overcome the consequences of the coronavirus pandemic for hotel and restaurant businesses are considered.
Export potential analysis of economic activities in Ukraine in the context of knowledge economy
Authors:   Lviv Polytechnic National University, Oleksiv Ihor , Mirzoieva Diana ,   Lviv Polytechnic National University
Published: August 2023

The purpose of current article is to evaluate the export potential of economic activities of Ukraine in the conditions of development of the knowledge economy using the method of k-means cluster analysis and hierarchical clustering. To do this, three indicators were identified that will characterize the export potential of economic activities in the development of the knowledge economy: labor intensity, share of value added in the output of each activity and the share in total exports of Ukraine in 2019. As the result of the cluster analysis, four clusters with different export potential were identified and their differences were investigated. Recommendations for increasing their export potential were developed for all clusters.
The potential relationship between loot box spending, problem gambling, and obsessive-compulsive gamers
Authors: Garea Shaun S. , Sauer James D. , Hall Lauren C. , Williams Matt N. , Drummond Aaron
Published: August 2023

Background and Aims

Loot boxes are digital containers of randomised rewards available in many video games. Individuals with problem gambling symptomatology spend more on loot boxes than individuals without such symptoms. This study investigated whether other psychopathological symptomatology, specifically symptoms of obsessive-compulsive behaviour and hoarding may also be associated with increased loot box spending.

Methods

In a large cross-sectional, cross-national survey (N = 1,049 after exclusions), participants recruited from Prolific, living in Aotearoa New Zealand, Australia, and the United States, provided self-reported loot box spending, obsessive-compulsive and hoarding symptomatology, problem gambling symptomatology, and consumer regret levels.

Results

There was a moderate positive relationship between loot box spending and obsessive-compulsive symptoms and hoarding. Additionally, greater purchasing of loot boxes was associated with increased consumer regret.

Discussion and Conclusion

Results identified that those with OCD and hoarding symptomatology may spend more on loot boxes than individuals without OCD and hoarding symptomatology. This information helps identify disproportionate spending to more groups of vulnerable players and may assist in helping consumers make informed choices and also aid policy discussions around the potentialities of harm.
Calibration and data-analysis routines for nanoindentation with spherical tips
Authors: Avadanii Diana , Kareer Anna , Hansen Lars , Wilkinson Angus
Published: August 2023

Instrumented spherical nanoindentation with a continuous stiffness measurement has gained increased popularity in microphysical investigations of grain boundaries, twins, dislocation densities, ion-induced damage, and more. These studies rely on different methodologies for instrument and tip calibration. Here, we test, integrate, and re-adapt published strategies for tip and machine-stiffness calibration for spherical tips. We propose a routine for independently calibrating the effective tip radius and the machine stiffness using standard reference materials, which requires the parametrization of the effective radius as a function of load. We validate our proposed workflow against key benchmarks and apply the resulting calibrations to data collected in materials with varying ductility to extract indentation stress–strain curves. We also test the impact of the machine stiffness on recently proposed methods for identification of yield stress. Finally, we synthesize these analyses in a single workflow for use in future studies aiming to extract and process data from spherical nanoindentation.

Graphic abstract
Integration of STEAM in Teaching Modern Geometry through Batik Motifs Creation with Algebraic Surfaces
Authors: Parhusip Hanna A. , Purnomo Hindriyanto D. , Nugroho Didit B. , Kawuryan Istiarsi S.S.
Published: August 2023

This paper explains teaching modern geometry for schools using software called Surfer and converting the algebraic surfaces into Batik motifs as one example of teaching mathematics with the integration of STEAM. Typical algebraic surfaces known in schools were, for example, cylinders
and spheres which are identified as traditional geometry in this article. On the other hand, other geometrical objects that are not solely identified as traditional ones are called modern geometrical objects. The objects addressed here are governed by multiple algebraic surfaces and existed
in the software called Surfer. The software is used for students to learn traditional geometry initially. After knowing how the software Surfer is doing, the software can be used for drawing more complex geometrical objects that are named to be modern geometry. This software is introduced
for students in middle schools until students in the university such that technology and art are immersed in learning geometry. In this research, the activity involved creating a Batik piece which was a local textile in Indonesia based on algebraic surfaces created with Surfer. There were
two methods of presenting the motif, these are after drawing the algebraic surfaces, students copied the surfaces into textiles using drawing Batik procedures. In the second method, students received some prototypes of algebraic surfaces and converted them into new patterns which were illustrated
on a special paper for a copper stamp prototype later on. Using geometry as the routine topic which must be learned by any level of students in learning mathematics, the learning, innovation skills, and technology skills are direct educational values that are targeted by the activities with
the approach presented in this article. The educational value is not only for the sake of mathematics and its content but also for integrating mathematics with other fields and exploring mathematical terms such that STEAM is introduced in this sense. The article here has addressed learning
geometry by combining technology, art, and creating products to the related geometrical studied objects to develop learning skills, innovative skills, and technology skills that are educational values required skills in 21st-century education.
Using Technology and Proofs Without Words in Teaching Mathematical Reasoning to Pre-Service and In-Service Geometry Teachers
Authors: Stupel Moshe , Fraivert David , Jahangiri Jay
Published: August 2023

With the ever-evolving implementation of technology in the teaching and learning of geometry, the task of designing and/or finding suitable questions or problems that can facilitate and promote mathematical reasoning and accurately assess students' understanding of the subject matter
can be a challenge. It is the aim of this article to share the findings of an experimental study on the use of GeoGebra graphing technology as an ITC tool coupled with proofs without words in our teacher training geometry classes. The problems used for our experimental study may not appear
to be rigorous and challenging in terms of mathematical contents but are perfect tools for pedagogical purposes. It is hoped that the ideas presented in this article can motivate future experiments and studies in this direction in the teaching and learning of geometry.
Técnicas y ejercicios para el autocontrol de conductas ansiosas en atletas de tiro deportivo de la categoría 11-12 años
Authors: Aguilera Gutierrez Karel , Hidalgo Reyes Pedro , Espinosa Álvarez Nestor
Published: August 2023

La presente investigación se realizó en el área deportiva" Joaquín de la Paz Zamora" del Municipio Bartolomé Masó Márquez en la provincia de Granma, Cuba. La población estuvo compuesta por 10 atletas, cinco de cada sexo, de la categoría 11-12 años del equipo de Tiro Deportivo. Se realizaron técnicas y ejercicios que permitieron favorecer el autocontrol de las conductas ansiosas en los atletas durante el entrenamiento y la competencia. Para ello se asumieron los fundamentos teóricos y metodológicos del desarrollo del proceso de preparación emocional y el autocontrol de conductas ansiosas. Se utilizaron métodos de investigación del conocimiento teórico y empírico. El diagnóstico inicial evidenció la prevalencia de altos niveles de ansiedad en la población objeto de estudio, que justificaron la necesidad de emplear técnicas y ejercicios para lograr el autocontrol de estas conductas ansiosas. La aplicación de técnicas y ejercicios impactó positivamente en el control de los estados emocionales de los atletas, lo cual favoreció su adecuada disposición psicológica.
ESTRATEGIAS GERENCIALES PARA EL MANEJO DEL CONFLICTO ENTRE LOS DOCENTES DEL ANTIGUO Y EL NUEVO ESTATUTO EN COLOMBIA.
Authors: VALLEJO RESTREPO JONNIS FERNANDO
Published: August 2023

Con el objeto de identificar las estrategias gerenciales para el manejo del conflicto entre los docentes del antiguo y el nuevo Estatuto de Profesionalización en las instituciones educativas del Municipio de Soledad, Departamento del Atlántico – Colombia, encontrándose sustentado por Robbins y Coulter (2005)    Chiavenato (2010)  Manucci (2006), Koontz, O`Donell y Weirich (2006), Dubrin (2005), Lobato (2005), entre otros. Metodológicamente, fue una investigación con un paradigma positivista, de tipo descriptiva, con un diseño no experimental, transeccional –descriptivo. La población objeto de estudio de esta investigación, estuvo integrada por los docentes y directores de las instituciones educativas del Municipio de Soledad, Departamento del Atlántico – Colombia. Como técnica seleccionada en la recolección de los datos fue la observación por medio de la encuesta; teniéndose como instrumento fue tipo cuestionario el cual fue aplicado a los docentes y directores, tipo escala Likert con cinco alternativas de respuestas cerradas, denominadas y codificadas. En cuanto a los resultados, se obtuvo que la media de la variable: Estrategias gerenciales, se enmarcó en 3.17, estando entonces dicho resultado dentro de la categoría de: Medianamente presente. Y para el caso de la variable: Manejo de conflictos, según los resultados se enmarcó en una media general de 3.63, estando entonces dicho resultado dentro de la categoría de: Presente. Recomendándose, a los directivos docentes divulgar los resultados obtenidos ante el personal docente y coordinadores municipales donde están adscritos la institución educativa analizada, con el propósito que se programen actividades de participación sobre comunicación asertiva y manejo de conflictos laborales, muy especialmente dirigidos a fortalecer las dimensiones barreras de la comunicación y tipos de conflictos laborales, para así lograr el mejor desarrollo dentro de las instituciones  desde la mediación, la negociación y la conciliación entre los docentes de ambos estamentos
Yeast gene KTI13 (alias DPH8) operates in the initiation step of diphthamide synthesis on elongation factor 2
Authors: Arend Meike , Ütkür Koray , Hawer Harmen , Mayer Klaus , Ranjan Namit , Adrian Lorenz , Brinkmann Ulrich , Schaffrath Raffael
Published: August 2023

In yeast, Elongator-dependent tRNA modifications are regulated by the Kti11•Kti13 dimer and hijacked for cell killing by zymocin, a tRNase ribotoxin. Kti11 (alias Dph3) also controls modification of elongation factor 2 (EF2) with diphthamide, the target for lethal ADP-ribosylation by diphtheria toxin (DT). Diphthamide formation on EF2 involves four biosynthetic steps encoded by the DPH1-DPH7 network and an ill-defined KTI13 function. On further examining the latter gene in yeast, we found that kti13Δ null-mutants maintain unmodified EF2 able to escape ADP-ribosylation by DT and to survive EF2 inhibition by sordarin, a diphthamide-dependent antifungal. Consistently, mass spectrometry shows kti13Δ cells are blocked in proper formation of amino-carboxyl-propyl-EF2, the first diphthamide pathway intermediate. Thus, apart from their common function in tRNA modification, both Kti11/Dph3 and Kti13 share roles in the initiation step of EF2 modification. We suggest an alias KTI13/DPH8 nomenclature indicating dual-functionality analogous to KTI11/DPH3.
Synthesis of nanopowders by the glycine-nitrate method in the In-Dy-O system
Authors: Malinovskaya Tatiana D. , Ghyngazov Sergei A. , Aparnev Alexander I. , Zhek Valentina V.
Published: August 2023

We investigated the feasibility of synthesizing nanopowders containing indium and dysprosium oxides by the glycine-nitrate method. It was found that the glycine-nitrate method significantly reduces the content of the indium component in the resulting mixture of indium and dysprosium oxides. In this case, intensive absorption of carbon dioxide from the air by the formed particles induces formation of amorphous carbonaceous compounds, which decompose only under high-temperature treatment (900 °C). This prevents compaction of powders synthesized by the glycine-nitrate method. Comparison of the characteristics of powders containing indium oxides and dysprosium, synthesized by the glycine-nitrate method and by the method of co-precipitation of indium and dysprosium hydroxides from chloride solutions, showed the advantage of the co-precipitation method in the pressing of powders.
High purity β-Bi2O3 preparation by thermal decomposition of tartrates
Authors: Timakova Evgeniya V. , Timakova Tatiana E. , Afonina Liubov I.
Published: August 2023

The processes of oxidative thermolysis of bismuth(III) DL-tartrate BiC4H3O6 obtained by the interaction of high-purity basic bismuth(III) nitrates [Bi6O4(OH)4](NO3)6·H2O and [Bi6O5(OH)3](NO3)5·3H2O with DL-tartaric acid solution have been investigated. The products of precipitation have been studied by methods of X-ray diffraction and thermal analysis, IR and Raman spectroscopy and chemical analysis. The staging of thermal transformation processes has been determined. Morphological studies and grain size analysis of initial precursors and final products of their thermal transformations have been carried out. The possibility of obtaining fine crystalline powders of tetragonal bismuth(III) oxide modification β-Bi2O3 by oxidative thermolysis of DL-BiC4H3O6 has been shown.
The effect of ammonia activation on the desalination potential of natural zeolite
Authors: Kenessova Aruzhan K. , Rakhym Akmaral B. , Zhaksybay Bagashar B. , Seilkhanova Gulziya A.
Published: August 2023

Despite the abundance of water bodies on Earth, there is a limited amount of potable water. Therefore, the desalination process is of great interest. Adsorption of the main contaminants of saline water (Na+, K+, Cl– ions) is an alternative process of desalination. In the present work, a sorbent based on natural zeolite (NZ) modified with ammonium chloride (NH4Cl) is obtained and the effect of modification on the removal of Na+ and K+ ions from saline water is studied. According to the Brunauer-Emmett-Teller (BET) analysis, the modification of zeolite with NH4Cl leads to an increase in its surface area (7.85 to 8.09 m2/g). According to the results of the cation exchange capacity (CEC) determination, the modification leads to a decrease in total CEC of zeolite (431.67±29.01 to 300.88±31.86 meq/100 g). According to the obtained results, ammonia modification enhances the adsorption ability of NZ to extract Na+ and K+ ions from saline water. The extraction degree (E) of Na+ ions by NH4-Z increases from 7.93±1.63 to 10.44±1.52%, while for K+ ions it increases about 2 times (27.69±2.45 to 56.46±3.71%). These results indicate that the ammonia-modified NZ can potentially be used as a desalination agent for the removal of Na+ and K+ ions from saline water.
Molecular dynamic simulation of the [N(C4H9)4]BF4 / (110) α-Al2O3 interface
Authors: Gainutdinov Igor , Uvarov Nikolay
Published: August 2023

The structure and transport properties of the pure salt [N4]BF4 and this salt located in the contact with the (110) surface of a-Al2O3 were studied using a MD computer simulation in order to reveal the effect of the salt/oxide interface on the structure and properties of the salt. The radial distribution functions of the ions and their mean square displacements were analyzed as a function of the temperature during the cooling of the salt. It was found that in all the cases anions are more mobile than cations. The molten phase of [N4]BF4 tends to crystallize at temperature 420 K which is close to the experimental melting point. The salt located in the [N4]BF4/(110)Al2O3 interface exhibits high values of anion self-diffusion coefficients which are higher by 1.2–2 orders of magnitude than in pure salt. This effect is likely to be caused by the formation of a layered atomic structure located within a characteristic thickness of 5 nm. Despite the structuring, the structure of the salt is amorphous, no crystallization-related effect is observed. The results of MD simulations agree with the experimental effect of the conductivity enhancement observed previously in [N4]BF4-Al2O3 nanocomposites.
Diversidade de Fungos Endofíticos em Sementes de Espécies Florestais Nativas na Região Sul do Brasil
Authors: Mazarotto Edson José , Santos Álvaro Figueredo dos , Santos Flávia , Rêgo Géssica Mylena Santana , Pimentel Ida Chapaval
Published: August 2023

RESUMO O objetivo deste trabalho foi detectar fungos endofíticos associados às sementes de 11 espécies florestais. Dez gêneros de fungos endofíticos foram associados às sementes dessas espécies. Os fungos encontrados com maior frequência nos lotes de sementes foram Aspergillus sp., Penicillium e Fusarium. Encontrou-se também Trichoderma sp. e Phomopsis sp.
Estudo epidemiológico do trauma pediátrico em um hospital de referência em Curitiba
Authors: SCHARNOSKI FERNANDA GLUS , DESCONSI ISADORA MEZZOMO , LINNENKAMP MARC DOMIT WERNER , FONTES HECTOR SBARAINI , PEREIRA CAROLINE DE OLIVEIRA , MARTINS RODRIGO KRIEGER , SARQUIS LUCAS MANSANO
Published: August 2023

RESUMO Objetivo: analisar a prevalência dos tipos de trauma, lesões decorrentes e condutas tomadas em crianças e adolescentes entre 0 e 17 anos, atendidos em um Pronto-Socorro no ano de 2019. Métodos: estudo transversal retrospectivo descritivo realizado através do levantamento de dados dos prontuários médicos no período de janeiro a dezembro de 2019, englobando pacientes pediátricos vítimas de trauma, divididos conforme a faixa etária: lactentes (0-1 ano), pré-escolares (2-4 anos), escolares (5-10 anos) e adolescentes (11-17 anos). Resultados: foram incluídos no estudo 3741 prontuários de pacientes. A procura de assistência médica ocorreu de maneira espontânea em cerca de 70% dos casos, sendo o sexo masculino o mais acometido significativamente em todas as idades. Em lactentes e pré-escolares, o principal mecanismo de trauma foi a queda de outro nível, correspondendo a 57,2% e a 34,1% das ocorrências, respectivamente; já nos escolares e adolescentes o principal mecanismo foi a queda de mesmo nível (38%) e o trauma esportivo (22,3%), nessa ordem. As principais lesões apresentadas, de maneira geral, foram o traumatismo cranioencefálico (28,2%), contusão de membros superiores (23,2%) e fratura de membros superiores (16,3%). Conclusões: o perfil das vítimas analisadas aponta o sexo masculino como o mais acometido, sendo o mecanismo de trauma o diferencial conforme a idade. Os mecanismos mais frequentes são as quedas, mais prevalentes em lactentes e pré-escolares, e a lesão mais comum é a contusão de extremidades, sendo os membros superiores os mais acometidos. Em geral, os casos foram considerados de baixa complexidade, com uma taxa de internação de 6%.
Selagem de zamac anodizado
Authors: Costa Carolina Dias da , Kunst Sandra Raquel , Lovato Tamires , Schneider Eduardo Luis , Oliveira Cláudia Trindade
Published: August 2023

RESUMO Estudos já demonstraram que a anodização de zamac é uma alternativa para minimizar os efeitos corrosivos da liga. Outros estudos, em alumínio, demonstraram que quando anodizado e selado pelo processo à quente, promove aumento da sua resistência à corrosão. No entanto, não se tem relatos na literatura sobre selagem à quente em zamac anodizado. O objetivo deste trabalho é identificar o efeito da selagem, quanto a resistência de corrosão, sobre zamac anodizado. Para tanto, peças de zamac 5 lixadas e polidas industrialmente foram anodizadas em eletrólito 0,3 M de ácido oxálico em diferentes tempos (5, 30 e 60 minutos), e posteriormente seladas em H2O destilada à 90ºC por uma hora. As peças foram analisadas por técnicas morfológicas e de corrosão. Os resultados mostraram que com o aumento do tempo de anodização os cristalitos maiores dissolvem-se originando cristalitos menores até a formação de camada lisa. Além disso, o processo de selagem promoveu a hidratação dos produtos anodizados do zamac. No entanto, com o aumento do tempo de anodização, a camada de óxido ficou mais compacta, devido aos menores cristalitos, com diminuição da espessura, devido à camada lisa. Isso resultou no melhor desempenho anticorrosivo da amostra anodizada por 5 minutos e selada.
Effects of ortho-eugenol on anxiety, working memory and oxidative stress in mice
Authors: Godoy R. , Macedo A. B. , Gervazio K. Y. , Ribeiro L. R. , Lima J. L. F. , Salvadori M. G. S. S.
Published: August 2023

Abstract Ortho-eugenol is a synthetic derivative from eugenol, the major compound of clove essential oil, which has demonstrated antidepressant and antinociceptive effects in pioneering studies. Additionally, its effects appear to be dependent on the noradrenergic and dopaminergic systems. Depression and anxiety disorders are known to share a great overlap in their pathophysiology, and many drugs are effective in the treatment of both diseases. Furthermore, high levels of anxiety are related to working memory deficits and increased oxidative stress. Thus, in this study we investigated the effects of acute treatment of ortho-eugenol, at 50, 75 and 100 mg/kg, on anxiety, working memory and oxidative stress in male Swiss mice. Our results show that the 100 mg/kg dose increased the number of head-dips and reduced the latency in the hole-board test. The 50 mg/kg dose reduced malondialdehyde levels in the prefrontal cortex and the number of Y-maze entries compared to the MK-801-induced hyperlocomotion group. All doses reduced nitrite levels in the hippocampus. It was also possible to assess a statistical correlation between the reduction of oxidative stress and hyperlocomotion after the administration of ortho-eugenol. However, acute treatment was not able to prevent working memory deficits. Therefore, the present study shows that ortho-eugenol has an anxiolytic and antioxidant effect, and was able to prevent substance-induced hyperlocomotion. Our results contribute to the elucidation of the pharmacological profile of ortho-eugenol, as well as to direct further studies that seek to investigate its possible clinical applications.
Diaspis echinocacti (Hemiptera: Diaspididae) on cactus pear cladodes: biological aspects at different temperatures
Authors: Albuquerque Junior P. S. , Silva C. A. D. , Ramos R. S. , Zanuncio J. C. , Castellani M. A.
Published: August 2023

Abstract The scale mealybug, Diaspis echinocacti (Bouché, 1833) (Hemiptera: Diaspididae), is one of the main pests of the cactus pear in Brazil. The objective was to study biological aspects of D. echinocacti at the constant temperatures of 25, 28, 30, 33 and 35 °C with relative humidity of 60 ± 10% and photoperiod of 12 hours in the laboratory on the cactus pear cultivar, “Orelha de Elefante Mexicana”, Opuntia stricta [Haw.] Haw. The development period (22 to 35 days) and survival in the egg (92 to 100%) and nymph (21.8 to 100%) stages and of the egg-adult cycle (20 to 100%), longevity (34.1 to 59.6 days) and fecundity (33 to 112 eggs) of D. echinocacti females with the different temperature and absence of males at the highest temperatures (> 30°C), indicated that the range between 25 °C and 30°C is the most favorable for this scale mealybug. This information may help to improve integrated management programs for D. echinocacti, in areas subject to seasonal temperature changes in the Brazilian regions where cactus pear is cultivated.
Doze maneiras de resolver o oscilador harmônico simples
Authors: Diniz Eduardo Moraes
Published: August 2023

Ao longo do curso de graduação em Física, o(a) estudante frequentemente se depara com problemas envolvendo oscilações. O principal modelo usado para investigar fenômenos oscilatórios é o oscilador harmônico simples. À medida que os(as) estudantes avançam em sua formação acadêmica, eles(as) também aprendem vários métodos para resolver equações diferenciais. É padrão empregar essas novas técnicas em problemas cuja solução é previamente conhecida, para testar a qualidade do método e para fins didáticos. Juntando essas duas linhas, apresento doze maneiras diferentes de resolver o conhecido problema do oscilador harmônico simples. Elas se enquadram em três categorias: básicas, intermediárias e avançadas. Essa divisão é baseada no nível de conhecimento necessário para resolver o problema, progressivamente adquirido ao longo da formação acadêmica do(a) aluno(a). Portanto, este material serve de referência para estudantes em diferentes etapas de sua formação.
A física e a música do fagote
Authors: Grillo Maria Lúcia Netto , Baptista Luiz Roberto Perez Lisbôa , Silos Matheus da Silva , Chaves Júnior José Gonçalves , Barbosa Caio Nabuco , Souza Matheus Brill e , Corrêa Elcio Antônio
Published: August 2023

No conjunto dos instrumentos de sopro (aerofones) existe um que, apesar de não ser tão popular quanto a flauta ou o saxofone, figura frequentemente na música de concerto; em orquestras e apresentações de câmara: o fagote. Possui uma sonoridade distinta, anasalada e inconfundível. Neste trabalho apresentamos alguns aspectos da física e da música do fagote. Selecionamos alguns sites com músicas que evidenciam o som do fagote. Foram feitos experimentos para estudo das ondas sonoras, espectros sonoros, níveis de pressão sonora, radiação sonora bem como a psicoacústica do instrumento. Na análise dos resultados experimentais foram utilizados os programas Praat, dBTrait e dBInside. Observamos que o fagote pode ser considerado um instrumento harmônico e que a relação de intensidade entre a fundamental e os harmônicos, inclusive sua presença ou ausência, depende da frequência emitida, da posição de medida, do tempo de emissão da nota e de como o som foi captado (incluindo ou não o ataque e o decaimento). Os processos experimentais utilizados podem ser aplicados ao estudo da física de outros instrumentos musicais, permitindo a observação de diferentes tipos de fontes sonoras e assim contribuindo para a motivação no ensino de física e de música.
Liquid fertilizers on photochemical efficiency and gas exchange in yellow passion fruit under saline stress
Authors: Guedes Luciano R. , Cavalcante Lourival F. , Souto Antônio G. de L. , Carvalho Lucas H. M. , Cavalcante Ítalo H. L. , Diniz Neto Manoel A. , Lima Geovani S. de , Melo Thiago de S. , Henrique Jamiles C. G. de S.
Published: August 2023

ABSTRACT The Northeast region of Brazil is the primary producer of yellow passion fruit. In recent years, water scarcity has led passion fruit growers to use highly saline water for cultivation. Therefore, implementing technologies that alleviate the negative effects of salt stress on plants is a promising approach, particularly in semi-arid conditions. This study aimed to assess the efficacy of organomineral fertilizers in mitigating salt stress effects on chlorophyll-a fluorescence and gas exchange in ‘Guinezinho’ yellow passion fruit seedlings. The treatments were arranged in randomized blocks with four replicates and four seedlings per plot, following a 2 × 3 factorial design. The factors considered were irrigation using water with low (0.18 dS m-1) and high (4.0 dS m-1) electrical conductivity and three liquid organomineral attenuators (Codasal™, Aminoagro Raiz™, and a mixture of Codasal™ + Aminoagro Raiz™ at a 1:1 v/v ratio), applied through fertigation. Irrigation with water containing 4.0 dS m-1 electrical conductivity, combined with liquid fertilizers, resulted in increased substrate salinity, and reduced stomatal conductance in yellow passion fruit seedlings, particularly when Codasal™ was applied. Application of Codasal™ alone or in combination with Aminoagro Raiz™ significantly enhanced variable fluorescence, quantum efficiency of PSII, CO2 assimilation rate, and instantaneous carboxylation efficiency in ‘Guinezinho’ yellow passion fruit seedlings.
Spatial variability of biophysical multispectral indexes under heterogeneity and anisotropy for precision monitoring
Authors: Lourenço Valeria R. , Montenegro Abelardo A. de A. , Carvalho Ailton A. de , Sousa Lizandra de B. de , Almeida Thayná A. B. , Almeida Thiago F. S. de , Vilar Bárbara P.
Published: August 2023

ABSTRACT The study aimed to characterize the spatial structure of variability of biophysical indexes of vegetation through images obtained by Unmanned Aerial Vehicles under strong heterogeneity and anisotropy, using geostatistical procedures. Plots with different types and densities of culture were evaluated in a didactic vegetable garden. Five vegetation indexes obtained from aerial multispectral camera images were evaluated parallel with geostatistical analysis and anisotropy investigation for multiscale spatial modeling. For the studied domain, geometric anisotropy was identified for the biometric indexes. The spherical model presented a better fit when anisotropy was not considered, whereas the exponential model had the best performance in the anisotropic analysis. Contrasting targets were better identified in multispectral images and considering anisotropy. The Soil-Adjusted Vegetation Index is recommended for similar applications.
Nutrients in swine manure for use as soil fertilizer
Authors: Nunes Emanuele H. , Gonçalves João C. , Pecoraro César A. , Bumbieris Junior Valter H. , Tavares Filho João
Published: August 2023

ABSTRACT Brazil is one of the world’s largest producers and exporters of animal protein, and swine farming plays a significant role in this sector. With the increase in the prices of mineral fertilizers, swine manure can be an alternative for fertilization and reduce production costs if carefully monitored to minimize damage and environmental impacts. The objective of this study was to characterize swine liquid slurry from a commercial finishing farm and determine the concentrations of total nitrogen, N-NH4 +, total phosphorus, and potassium for its use as a source of nutrients for the soil. The manure volume was calculated. The body retention of nitrogen, phosphorus, and potassium and physical and chemical attributes of the feed and manure were evaluated. In the analyzed swine manure, the concentrations of the total nitrogen, ammoniacal nitrogen, total phosphorus, and potassium were 6.14, 2.87, 3.66, and 2.64 g L-1, respectively. Liquid swine manure proved to be an efficient substitute for nitrogen, phosphorus, and potassium chemical fertilizers, representing cost savings of R$11,743.44 in chemical fertilizers.
Hydrothermal pretreatment of poultry litter for biogas production
Authors: Oliveira Mayara P. de , Paranhos Aline G. de O. , Adarme Oscar F. H. , Aquino Sérgio F. de
Published: August 2023

ABSTRACT Hydrothermal pretreatment (HPT) allows the solubilization of the hemicellulose, leading to increased biodegradability for microorganisms. This paper presents a study based on the evaluation of the variables time (12 to 60 min), temperature (80 to 200°C), and solid/liquid ratio (4 to 8 g mL-1) for the HPT (autohydrolysis) of synthetic poultry litter (rice straw: poultry manure 1:5) using the Doehlert matrix. Twelve HPT conditions followed by anaerobic digestion were evaluated with a focus on methane production. Firstly, tests were conducted to evaluate biogas production in a single stage in a single reactor, where both the acidogenic and methanogenic phases occur. Subsequently, tests were conducted to evaluate biogas production in a two-stage, consisting of separating hydrogen and methane production phases. The best performance of the biochemical potential of methane was the conditions 6 (24 min, 120 °C, and solid-liquid ratio = 4) in a single stage and 3 (48 min, 160 °C, and SLR = 8) in a two-stage, producing 255.6 and 277.6 NmL CH4gVS-1, respectively. Using the desirability criteria, two hydrothermal pretreatment (HPT) conditions were evidenced/ condition 1 in two stages (12 min, 80 °C, and SLR = 4)- (D1-2S) and condition two in two stages (12 min, 98 °C, and SLR = 4) - (D2-2S) showed high methane production, 248.9 and 249.3NmL CH4∙gVS-1, respectively.
Potential risks of soil erosion in North-Central Vietnam using remote sensing and GIS
Authors: Ha Nguyen T T. , Tuyen Tran T. , Sarzhanovna Astarkhanova T. , Thuy Hoang T. , Luong Vu V. , Du Tran D. , Tai Dau K. , The Hoang A. , Thanh Nguyen N. , Duong Phung T. , Ha Vo T. T. , Khanh Vo T. N.
Published: August 2023

ABSTRACT Unsustainable exploitation activities (UEAs), combined with the increasing impacts of global climate change are the key causes that lead to soil erosion in the North-Central Vietnam. Mountainous areas in the North-Central Vietnam commonly have steep slopes and sandy clay in the surface soil layer, which contribute to enhancing the soil erosion, resulting in a serious loss of life and property. This study investigates the land cover change (LCC) across the Thanh Chuong district by combining Remote Sensing Technique (RST) data with Geographic Information System (GIS) and further, establishing erosion risk hazard maps based on the RUSLE model simulation. To achieve these objectives, Sentinel and Landsat satellite images from the period 2010_2021 were acquired. It was verified that the forest area gradually decreased from 2010_2021, and the average annual soil loss was approximately 25 t per year. The amount of erosion that led to a soil loss of up to 18% of the total land area is related to weather conditions, terrain features, and the soil texture. The decline in the vegetation cover is expected to be the main cause of increasing trends in erosion and soil loss.
ROOMING-IN PRACTICES AND SATISFACTION WITH CARE ACCORDING TO DISCHARGE ON EXCLUSIVE BREASTFEEDING
Authors: Maliska Isabel Cristina Alves , Oliveira Saionara Nunes de , Andrade Zannis Benevides de , Wilhelm Laís Antunes , Velho Manuela Beatriz
Published: August 2023

ABSTRACT Objective: to describe the practices that favor breastfeeding performed in the Rooming-In area and satisfaction with the care received according to discharge on exclusive breastfeeding. Method: a quantitative study conducted between July 2020 and September 2021 in a maternity teaching hospital from southern Brazil; a total of 756 puerperal women participated by means of an online questionnaire 20 days after hospital discharge. The data were analyzed in a descriptive way with absolute and relative frequencies, and the chi-square test was applied to verify any statistical difference according to the “discharge on exclusive breastfeeding” outcome. Results: the prevalence of discharge on exclusive breastfeeding was 85.0% and the practices that presented and association with the outcome were guidelines regarding the breastfeeding readiness signs (69.0% versus 57.5%), correct position and latch (94.1% versus 86.7%), free demand (79.2% versus 69.0%), exclusive breastfeeding until the sixth month of life and complemented until two years of age (77.9% versus 67.3%); and the practice of not offering other milk during hospitalization (88.5% versus 17.1%). Satisfaction with the care received was high (95.0%) and presented no association with the outcome of “discharge on exclusive breastfeeding”. Conclusion: most of the women treated had access to the practices that favor breastfeeding, and education in health exerted a positive impact on exclusive breastfeeding at hospital discharge.
Processing on the physical and physiological quality of chickpea (Cicer arietinum L.) seeds
Authors: Santos Samuel Gonçalves Ferreira dos , Araujo Eduardo Fontes , Araujo Roberto Fontes , Kohl Sediane , Coelho Ana Paula de Freitas , Nascimento Warley Marcos
Published: August 2023

Abstract: Processing consists of sequential operations aimed at cleaning, classifying, and treating seeds, with the goal of improving the quality of the lot. The aim of this study was to evaluate the effect of the processing stages on the physical and physiological quality of chickpea seeds, cultivar BRS Cícero. Seeds were sampled before processing and after passing through the air screen machine (upper sieve of 12 mm and lower sieve of 7.5 mm), elevators, storage silo, and gravity table (upper discharge, high intermediate, low intermediate, and lower discharge). The seeds were evaluated for moisture content, physical purity, germination test, electrical conductivity test, emergence in sand, emergence speed index, accelerated aging, and tetrazolium test. The processing resulted in increased physical purity and reduced percentage of broken seeds in the lot of chickpea seeds. Seeds collected from the upper and intermediate chutes of the gravity table showed higher germination values. Seed processing using the air screen machine and the gravity table is effective in improving the physical and physiological quality of the lot of chickpea seeds, cultivar BRS Cícero.
Fruit biometrics and maturity on the quality of Diospyros inconstans Jacq. Seeds
Authors: Sanches Laura Araujo , Ramalho Aline Bueno , Camili Elisangela Clarete , Guimarães Rosiane Alexandre Pena
Published: August 2023

Abstract: This study aimed to evaluate the biometric characteristics of fruits and seeds of Diospyros inconstans Jacq., germination and formation of seedlings obtained from fruits at three maturity stages, subjected to different temperatures. Biometric data were obtained from 100 fruits and 100 seeds. The determining parameters in the biometry of the fruits were: length, width, mass and number of seeds/fruit and for the seeds: length, width, thickness and mass. In the germination test, a factorial scheme (3x4), three maturity stages (green, intermediate and reddish), and four temperatures (20, 25, 30 and 35 °C) were used. The analyzed variables were: germination, germination speed index (GSI), mean germination time (MGT), time to obtain 50% germination (t50), percentage of seedlings, length and dry mass of shoots and roots, and collar diameter. Fruits and seeds showed greater variation in the parameters fresh mass and number of seeds per fruit. The germination speed index was higher in seeds from reddish fruits, and seeds from green fruits originated better-developed seedlings. Temperatures of 25 and 30 °C are recommended for conducting the seed germination test at the three maturity stages.
Validation of the paper roll plus vermiculite (PR+V) germination test methodology for treated corn seeds
Authors: Rocha Debora Kelli , Carvalho Everson Reis , Lima Renato Ribeiro de , Nardelli Amanda Carvalho Penido , Andrade Thaís de , Carvalho Maria Laene Moreira de , Fernandes Nilceli
Published: August 2023

Abstract: A germination test is required by Brazilian standards for seed commercialization. The use of an adequate methodology that expresses the real physiological quality of seeds and minimizes possible phytotoxicity by chemicals is important for the production chain. In this context, the aim was to evaluate and validate the paper roll plus vermiculite (PR+V) germination test methodology for use in corn seeds. Two hybrids, one sensitive and the other tolerant to seed treatment, both with different vigor levels and under different chemical treatments, were used. Ten laboratories accredited by the Ministério da Agricultura e Pecuária (MAPA) were selected to perform and evaluate the PR+V germination tests. The data were subjected to statistical procedures to estimate the repeatability and reproducibility and check the accuracy and robustness of the test. The data were accurate, robust, and precise within the critical limits of 1 and 5%. The statistical results for repeatability, reproducibility, and bounds of the Mandel test were also accurate and precise at the critical limits of 1 and 5% for the normal seedlings evaluated by the PR+V methodology. Thus, the methodology can be used routinely to test corn seeds, especially those treated with phytosanitary products.
ANALYZING THE PERFORMANCE OF HIP CEMENT SPACERS: INVESTIGATION OF CRACK BEHAVIOR THROUGH A MULTISCALE APPROACH
Authors: Salah Hichem , Ghazi Abdelkader , Bouziane Mohamed Mokhtar , Mankour Abdeljalil , Merdji Ali , Bouiadjra Bel Abbes Bachir , Chikh Bahri Ould
Published: August 2023

Close collaboration between surgeons and engineers is paramount in the intricate process of designing and evaluating hip joint prostheses. In revision surgeries, cement spacers play a vital role, but their effectiveness hinges on the reinforcement of the cement, bone, and femur to minimize stress. To assess the fracture behavior of reinforced spacers, we employ a comprehensive three-dimensional approach that analyzes the three primary materials used for full stems: titanium, ceramics, and stainless steel. Our analysis focuses on evaluating the von Mises stress and stress intensity factor along the crack tip using linear elastic analysis. Additionally, we utilize the extended finite element Method (X-FEM) to simulate crack initiation and propagation in non-reinforced cement spacers. By comparing the results obtained from these two methods, we gain valuable insights into the influence of different materials on the performance and durability of reinforced spacers. Our findings unequivocally demonstrate that reinforcing spacers with ceramic and stainless-steel full stems are exceptionally effective techniques for enhancing the strength of hip spacers. Specifically, we observed a significant reduction of stress levels by 30% in various hip prosthesis components, along with a notable 23% decrease in the stress intensity factor for spacers reinforced with ceramic stems. These insights are invaluable for spacer designers and can contribute significantly to improving the durability of hip joint prostheses, ultimately minimizing the need for early hip revisions.
Ocio, actividad física y territorio educativo: Relato de experiencias del programa sesc Curumim
Authors: Del Mando Lucches Felipe , Romero-Barquero Cecilia Enith
Published: August 2023

El artículo presenta una investigación cualitativa que analizó, durante dos años, la participación de la población infantil y sus familias en los espacios públicos de la ciudad de Santos. Las experiencias se enmarcaron bajo el programa Curumim, vinculado al sector socioeducativo de Servicio Social de Comercio (sesc) en el Estado de São Paulo, Brasil. Se utilizaron registros y reportes, además de la implementación de experiencias deportivas con énfasis en el ocio y la educación, tales como viaje en catamarán, apreciación de la naturaleza, sensibilización ambiental, juego de búsqueda del tesoro, recorrido en bicicleta, picnic, origami y visita a lugares históricos. La escogencia y participación a cada una de las experiencias fue voluntaria. Los resultados reportaron una participación positiva, comprobada en la cantidad de personas involucradas en las experiencias. Además, los informes registraron que la población no tenía la costumbre de pasear en los espacios públicos de la ciudad. Asimismo, se fomentó el contacto afectivo debido a la participación en las actividades y se generó sentido de pertenencia a la ciudad. Finalmente, se reforzó que el programa es un promotor de la educación integral y que la ciudad puede ser un territorio educativo accesible en el que se participa, convive y aprende.
La incidencia de los juegos cooperativos en el fortalecimiento de la convivencia escolar
Authors: Jaramillo Martínez Heyner Agmeth , Hernández Huertas Adrián Camilo , Fajardo Cruz David Esteban , Torres Pasos Favio Medardo
Published: August 2023

El siguiente artículo deriva de la investigación titulada “La incidencia de los juegos cooperativos en el fortalecimiento de la convivencia escolar de los estudiantes del grado 6-1 de la Institución Educativa Municipal Mercedario”, que tenía como objetivo establecer la incidencia de dichos juegos en la convivencia escolar. Para ello, se hizo necesario realizar un diagnóstico relacionado con la convivencia escolar metodología que se trabajó en este artículo fue de paradigma cualitativo, con un enfoque crítico-social y método de investigación acción, implementando técnicas de recolección de información como la observación, diario de campo, la entrevista y grupo focal. Dentro de las prácticas pedagógicas, al implementar los juegos lúdicos- cooperativos, los estudiantes del grado 6-1 fortalecieron la convivencia escolar, donde los lazos de amistad y compañerismo se vieron beneficiados. Cabe mencionar que gracias a los juegos cooperativos se pudo integrar un contexto lúdico-social donde prevaleció la formación integral, buscando una aceptación completa donde todos se vean beneficiados. Finalmente, podemos concluir que la aplicación de los juegos cooperativos para el mejoramiento de la convivencia escolar de los estudiantes del grado 6-1 es acertada, ya que permite solucionar las diferentes dificultades que se presentaban con respecto a la convivencia escolar.
Exploración de la relación entre coordinación motriz y desempeño académico
Authors: Salgado Cajales Farid
Published: August 2023

Este artículo recoge resultados destacados sobre el posicionamiento de la experiencia corporal como fundamento el desarrollo de las funciones y procesos cognitivos de base y muestra los resultados obtenidos en un estudio de caso. Con base en las tesis que emergen de la relación entre experiencia corporal y desarrollo cognitivo, se ha venido caracterizando una población estudiantil de secundaria básica en sus desempeños a nivel de la coordinación motriz y logros académicos. La información es recolectada a través de pruebas de tipo psicomotor y académico y se analiza por medio de métodos estadísticos a nivel exploratorio y de correlación. El objetivo de la investigación es identificar variables y factores que hagan más efectiva la articulación de los procesos que se dan en los escenarios de la educación física, el arte, la música y la práctica deportiva con las demandas del desarrollo de las funciones cognitivas y conativas. Para ello se ha venido estructurando una base de datos que facilita la exploración de dicha relación en función de diferentes variables. Los resultados muestran una tendencia, sobre todo en la población femenina, a correlacionar altos desempeños académicos con niveles avanzados de desarrollo de la coordinación motriz.