bluuebunny/crossref_metadata_2025 huggingface dataset:
Experiencia educativa focalizada en el personal docente para promover el compromiso escolar. Percepciones de estudiantes
Authors: Rigo Daiana Yamila
Published: July 2021

This paper describes an investigation carried out at the primary level of education based on the theoretical postulates of the theory of self-determination and school engagement with the objectives of: (a) examining the natural configurations of support for autonomy and reference structure by teachers and perceived by the students, (b) describing the association between different perceptions with the students’ self-assessments in each dimension of engagement, (c) designing an educational experience aimed at promoting the support provided by teachers in class and on homework school children, and (d) assessing the association between perceptions of support and self-valued engagement by students after educational experience. The sample was composed up of 5th grade students (n = 53), from a public school of Argentina. Data collection was carried out based on the administration of an ad hoc questionnaire at the end of the experience. In addition, two standardized instruments were used before and after the investigation to assess the perception of the support received by the teacher and the students’ engagement. The results show that students get more involved with their learning when they appreciate that school tasks are defined under an instruction that supports their initiatives, but at the same time, offers an adequate definition of learning goals and objectives. The findings offer concrete guidelines to scaffold educational practices aimed at undermining the disengagement behaviors in the hands of a teaching style that supports students towards decision making and with formative feedback.
Paz y discurso: La construcción de la identidad pacífica costarricense entre 1978 y 1990
Authors: Astorga Sánchez Leonardo
Published: July 2021

El presente artículo tiene como principal objetivo realizar un recorrido y descripción del uso del concepto paz durante tres administraciones presidenciales costarricenses entre 1978 y 1990. Tomando como punto de partida La historia de los conceptos, se investiga cómo los expresidentes Carazo, Monge y Arias hicieron uso de la idea de paz para legitimar sus proyectos políticos y aspiraciones, y también cómo, a través de sus discursos, se fortaleció la ya tradicional identidad pacífica de Costa Rica, así se reforzó, en un contexto de crisis y Guerra Fría, la llamada excepcionalidad costarricense.
Tendencias en la composición de la comunidad estudiantil de la Sede Regional Brunca de la Universidad Nacional (1973-2018)
Authors: Fonseca Zúñiga Edgardo
Published: July 2021

Este artículo presenta un análisis de la composición del estudiantado de la Sede Regional Brunca de la Universidad Nacional, con el fin de determinar la trayectoria histórica seguida por esta población beneficiada gracias al proceso de regionalización ejecutado por este centro de estudios. Dicho análisis procura vislumbrar, en alguna medida, la implementación de la óptica democratizante de esta universidad estatal. El argumento central de la investigación es el vínculo establecido entre el fortalecimiento institucional de la sede y la expansión de los servicios educativos que ofrece. Así, el crecimiento de la Sede Regional Brunca ha significado un mayor acceso a educación superior de grupos sociales vulnerables. Las fuentes utilizadas son las Estadísticas de Educación Superior del Consejo Nacional de Rectores y datos estadísticos de la Oficina de Registro de la Universidad Nacional.
Modified hydrogen peroxide bleaching of bamboo chemo-mechanical pulp using aqueous alcohol media
Authors: Liang Fangmin , Fang Guigan , Jiao Jian , Deng Yongjun , Han Shanming , Li Hongbin , Tian Qingwen , Pan Aixiang , Zhu Beiping
Published: July 2021

The brightness of bleached bamboo chemo-mechanical pulp (CMP) is often too low to be used as a furnish in value-added paper products. In this study, preliminary optimization of various parameters of a modified hydrogen peroxide (H2O2) bleaching procedure for bamboo CMP pulps was performed using the inclusion of ethanol in the bleaching medium (IEBM). Compared with a conventional bleaching method, this modified process is aimed at improving bleaching efficiency and brightness ceiling of bamboo CMP with the proper usage of chemicals. The CMP was bleached to a brightness of 74.2% ISO at the usage level of 12% H2O2, which shows it increased by 7.4% ISO compared with the conventional method. For a brightness target of 72.0% ISO, bleaching with the IEBM method reduced the H2O2 consumption by approximately 60%. In addition, a higher activation energy of H2O2 for the IEBM method was calculated to be 23.3 kJ/mol, which was increased by 3.3 kJ/mol compared with the conventional method.
Wet extrusion molding of wood powder with hydroxy-propylmethyl cellulose and with citric acid as a crosslinking agent
Authors: Tao Xiangyu , Nonaka Hiroshi
Published: July 2021

To mitigate global warming and the serious problems incurred by the disposal of petroleum-based plastics, it is important to develop derivatives of biomass materials that can be used as substitutes. To overcome the lack of thermoplasticity of wood, a wet extrusion molding process for wood powder using a cellulose derivative, hydroxypropylmethyl cellulose (HPMC), had been developed. However, this material quickly reabsorbed water, swelled, and disintegrated in liquid. In the present study, a natural organic acid, citric acid, was added and kneaded together with the wood powder, the HPMC, and water. The resultant clay-like material was extruded into a tube-shaped material. The tube was air-dried and heated at 180 °C for 5 min to 30 min to allow crosslinking. By heating 1% citric acid for 30 min, the material avoided disintegrating in water for 60 min. The addition of 3% citric acid with 30 min crosslinking gave the material water resistance in water for 12 h. The degradability in the water was found to be controllable by changing the amount of citric acid and the heating time. This is a novel result because wood can be molded into a practical three-dimensional (3D) biomass composite material using this technology with natural substances without relying on petroleum-based plastics.
Isolation and identification of the antibacterial compounds in Coptis chinensis for the preservation of wood
Authors: Wang Lei , Li Binhui , Zhao Xiaoqi , Ren Shiming , Wang Yamei
Published: July 2021

Wood is a biomass material that is easily eroded by wood-rotting fungi. Coptis chinensis is a natural green plant, which has an inhibitory effect on most microorganisms. Based on the highly toxic effects of the currently used wood chemical preservatives on humans, animals, and the environment, Coptis chinensis was selected to perform decay resistance experiments of wood in this paper. The active ingredients with bacteriostatic properties in Coptis chinensis were separated and screened via chemical treatment, and their structure was identified via nuclear magnetic resonance spectroscopy. The primary bacteriostatic components in Coptis chinensis were berberine hydrochloride, palmatine, and jatrorrhizine. The bacteriostatic zone experiment with a single component and different compounds for white-rot and brown-rot fungus were tested by the disc agar diffusion method. The bacteriostatic effect of berberine hydrochloride in a single active fraction was better. The three-fraction compound had the best bacteriostatic effect and was equivalent to alkaline copper quaternary. The natural active bacteriostatic fractions in Coptis chinensis had noticeable inhibitory effects on white-rot fungus (Trametes versicolor (L.) Lloyd) and brown-rot fungus (Gloeophyllum trabeum (Pers.) Murrill). The minimum bacteriostatic concentration was 0.01 g/mL. The results showed that Coptis extracts had potential as a wood protectant.
Effect of the chassis parts surface condition from high-strength titanium alloy VT-22 in the process of fatigue tests
Authors:   ANTONOV COMPANY, Gorpenko A. O. , Semenets O.I. ,   ANTONOV COMPANY, Doniy O. M. ,   National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Valuiska K.O. ,   Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine
Published: July 2021

The research focuses on the influence of the surface condition on the resource of high-strength titanium alloy VT-22 landing gear details during fatigue tests. The tests were performed on special facilities that simulate the workload on a rod detail at the stage of extending and retraction of the landing gear. Fatigue tests were performed on four rods. Rods № 1-3 were destroyed at the lugs level, rod №4 withstood the entire cycle of loads, and was examined in an undamaged state. It was found that the cause of the failure of the rod №1 was axial play formation as a result of bracket lug deformation, which led to shock loads on the lug of the rod №1 during the tests. The destruction of the rod №2 could be caused by the shock axial loads due to changes in the characteristics and load values of the facility on the rod №2. The priority factor influencing the premature failure of the rod №3 was the high risks from surface machining in the most loaded part of the rod №3, namely at the R-junction of the cylindrical part to the lug. The presence of surface defects formed during the manufacturing stage, as well as the presence of deep scratches in the area with high load reduce the life of rod № 3 fivefold compared to the undamaged rod № 4, which had no visible surface defects. Surface damage detected in the non-chromized area of the rods can be eliminated by blasting with subsequent surface polishing, which will provide the required resource of the detail (rod № 4). Keywords: high-strength titanium alloy VT-22, rod, fatigue tests, surface defects, structure of the surface layer.
About the titanium foil using in the brazed construction of small windows for the transmission of radiant energy
Authors:   Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Zhuravlev V. S. , Sydorenko T. V. ,   G.V. Kurdyumov Institute for  Metal Physics of the NAS of Ukraine
Published: July 2021

The aim of this work was to miniaturize the design of a brazed joint of a thin non-metallic disk with a hollow thin-walled metal cylinder for operation as part of a vacuum device in a wide temperature range. For brazing a non-metallic disk with a glass tube-shaped device body, when choosing a metal filler, the fragility of glass, its low mechanical strength in bending and tensile and a lower thermal coefficient of linear expansion than metal fillers must be taken into account. Therefore, the use of low-temperature plastic solders based on tin, indium, lead etc., which are alloyed with titanium, is preferable. However, the disadvantages of these fillers include a significant decrease in mechanical strength when the brazed unit is heated to relatively low temperatures, especially if there is a gas inside the device under excessive pressure. The option of brazing a leucosapphire disk with a glass tube was also considered. A design has been proposed to determine how a disk is connected to a titanium body. This design has increased the heat resistance of the leucosapphire lens, which is connected to the body of the product made of titanium alloy or covar. Such connection can be used as pyrometer windows installed directly in the body of an internal combustion engine or gas turbine engine. The main feature of this development was the creation of a brazed joint structure in which the shell covering the disk is made of non-metal, in this case of leucosapphire, made of titanium foil with a thickness of 100 and in some cases 50 μm. Brazing modes were set and brazed windows were made. Tests on the vacuum density after different modes of thermal cycling of brazed samples showed high performance of this structure of the brazed joint. It was shown that the use of titanium foil makes it possible to obtain high-quality heat-resistant brazed joints. The relatively small stresses that lead to plastic deformation of the foil make it possible to increase the inconsistency of the thermal coefficient of linear expansion (TCLE) of materials that were brazed. It shout be noted that the foil material can also be other metals which had chemical active towards non-metallic materials or their components, for example, zirconium, niobium, tantalum, etc. Keywords: structures of brazed joints, brazing of non-metals, non-metallic materials, leucosapphire, glass tube, adhesive-active filler metals, fillers, titanium.
Isomeric Ratios 109m,gPd in the (γ, n) and (n, 2n) Reactions
Authors: Palvanov S. , Akhmadzhanov T.
Published: July 2021

The method of induced activity of the investigated cross-sections of excitation of isomeric states in the 110Pd(y,n)109m,gPd and 110Pd(n,2n)109m,gPd reactions in the energy range 12–35 MeV is studied. The experimental results are compared with those of calculations carried out using the software package TALYS-1.6.
Оптичні характеристики біметалевих нанокуль
Authors: Korotun A.V. , Koval A.O. , Pogosov V.V.
Published: July 2021

В роботi одержано формулу для часу релаксацiї електронiв на поверхнi i проаналiзовано частотну залежнiсть електричної i магнiтної компонент поляризовностi двошарової металевої нанокулi. Максимуми поляризовностi вiдповiдають плазмонним резонансам ядра та оболонки. Розрахунки було проведено для бiметалевих наночастинок Ag–Au, Au–Ag та Ag–Al, розташованих у тефлонi. Продемонстровано можливiсть керування оптичними характеристиками бiметалевих наночастинок змiною їх морфологiї. Проведено розрахунки перерiзiв екстинкцiї i розсiювання та фактора пiдсилення поля в околi наночастинок у широкому спектральному iнтервалi за рiзних спiввiдношень розмiрiв ядра та оболонки, а також оцiнено температуру бiметалевої нанокулi для фототермiчної терапiї злоякiсних пухлин.
La politización de la integración en Europa: una aproximación a través del análisis de la literatura
Authors: Hernandez-Garcia Nuria
Published: July 2021

La imposibilidad de integrar a los inmigrantes es uno de los elementos principales que utilizan los partidos xenófobos europeos como reclamo electoral. Esta estrategia encuentra su base en lo que se ha llamado crisis de valores de las democracias liberales occidentales. El objetivo de este artículo será estrechar el marco teórico sobre el tan usado y politizado concepto de “integración” a través del análisis teórico y político del mismo y su desarrollo en indicadores. Se concluirá que la integración responde más a la parte subjetiva y de identidad, y por tanto individual. Esto llevará a proponer: la promoción de proyectos que favorezcan el diálogo intercultural basado en el respeto de los Derechos Humanos y del Estado de Derecho; así como la observancia de otros factores —como el económico— como determinantes en la exclusión de determinados grupos.
Control migratorio y producción de irregularidad. Normas, prácticas y discursos sobre la migración en Argentina (2016-2019)
Authors: Jaramillo Verónica , Gil-Araujo Sandra , Rosas Carolina
Published: July 2021

El objetivo de este artículo es analizar las relaciones entre la reconfiguración normativa en materia migratoria impulsada por el Gobierno argentino de Mauricio Macri y la producción de irregularidad migratoria entre 2016 y 2019. Para ello nos enfocamos en los controles de permanencia, el acceso a la documentación y las expulsiones. El diseño metodológico se sustenta en el análisis de documentos oficiales, entrevistas, observaciones y datos estadísticos. Este estudio muestra los variados instrumentos a través de los cuales el Estado interviene en la producción de la irregularidad migratoria que amenaza a la población migrante con la expulsión. También evidencia la fragilidad del estatuto de extranjería y la arbitrariedad que sustenta la relación del Estado receptor con las poblaciones no nacionales.
The importance of the compartment model of body composition analysis in women with severe obesity
Authors: Vidal-Linhares Renato , Barros-Costa Mônica , Marino-Rosa Felipe Monnerat , Do Vale-Quaresma José Carlos , Fernandes-Filho José , Castilla Fábio André
Published: July 2021

Introduction. Obesity is usually diagnosed based only on body mass index (BMI), which may lead to an unreliable body composition analysis. Objective: To analyze the body characteristics of morbidly obese (class III) women referred to bariatric surgery using the compartment model of body composition analysis. Materials and methods: Cross-sectional study conducted in 2017 in 14 morbidly obese women aged between 25 and 51 years, who attended clinical and physical therapy assessment prior to undergoing bariatric surgery at a university hospital in Rio de Janeiro, Brazil. Body composition analysis was performed using an octopolar bioimpedance scale. The Pearson’s correlation coefficient was used to analyze the correlation between variables, with a significance level of p<0.05. Results: A high mean percentage of fat body was observed (51.2%), mainly in the trunk. BMI was correlated with total fat in kilograms (r=0.93), total body fat percentage (TBF%) (r=0.67), total body water (r=0.63), and muscle mass (r=0.60); besides, a moderate correlation with the waist-to-hip ratio (WHR) was found (r=0.55). WHR showed a correlation with TBF% (r=0.60) and a moderate correlation with total fat in kilograms (r=0.57). Moreover, the sarcopenia index was correlated with muscle mass (r=0.79) and total body water (r=0.78). All these correlations were statistically significant (p<0.05). There were no sarcopenia cases. Conclusion: A higher concentration of fat in the trunk and the upper limbs was observed in the study population; however, none of the participants had sarcopenia. On the other hand, BMI showed a stronger correlation with both total fat (kg) and TBF% than with WHR. Such findings suggest that assessing these patients based only on BMI or WHR may hinder the development individualized treatment strategies.
Ambientes alimentarios escolares y alimentación infantil: una aproximación etnográfica en colegios de Cali, Colombia
Authors: Varela-Árevalo Maria Teresa , Méndez-Paz Fabián
Published: July 2021

Introducción. Los colegios son escenarios centrales para la promoción de la alimentación saludable a partir de sus ambientes alimentarios.
Objetivo. Caracterizar los aspectos físicos, socio-culturales, políticos y económicos de los ambientes alimentarios de cuatro colegios de diferentes niveles socio-económicos (NSE) en Cali, Colombia.
Materiales y métodos. Estudio cualitativo basado en un enfoque de etnografía focalizada. Se recolectó información durante 12 semanas mediante observación participante en cuatro colegios (3 semanas por colegio), con un total de 1409 niños con edades entre los 8 y 12 años matriculados en los grados tercero a sexto. Además, se analizaron documentos institucionales de los colegios y se realizaron entrevistas a profundidad a 14 informantes clave (personal directivo, administrativo, operativo y docente de las cuatro instituciones)
Resultados. Los ambientes alimentarios escolares se caracterizaron por ofrecer alimentos ultraprocesados a precios bajos, en contraste con una baja oferta de frutas con precios altos. No se observaron políticas de salud escolar que contemplen la alimentación saludable y el cumplimiento de las disposiciones de la ley 1355 de 2009, sobre la prevención de la obesidad, es pobre en tres colegios. La importancia de la alimentación en el colegio de NSE alto se relacionó con políticas y acciones de promoción de hábitos de alimentación saludable.
Conclusiones. Es necesario fortalecer la implementación de políticas públicas de prevención de la obesidad infantil, así como monitorear el cumplimiento de la legislación sobre el tema en los colegios, mediante acciones que favorezcan la alimentación como parte fundamental de una educación integral, tales como la eliminación de máquinas dispensadoras de snacks y bebidas azucaradas, el establecimiento de un menú obligatorio más saludable en las cafeterías escolares, y la reducción de los precios de alimentos saludables.
Rapid test for detecting artificial colorants in wine products
Authors:   All-Russian National Research Institute of Viticulture and Winemaking Magarach of the RAS, Anikina N. S. , Gnilomedova N. V. ,   All-Russian National Research Institute of Viticulture and Winemaking Magarach of the RAS, Cherviak S. N. ,   All-Russian National Research Institute of Viticulture and Winemaking Magarach of the RAS, Vesiutova A. V. ,   All-Russian National Research Institute of Viticulture and Winemaking Magarach of the RAS, Ermihina M. V. ,   All-Russian National Research Institute of Viticulture and Winemaking Magarach of the RAS
Published: July 2021

The problem of wine color adulteration is relevant all over the world, and, therefore, establishing or refuting the fact of the colorant presence is an integral part of the techno-chemical control. There are many methods for determining artificial colorants (AC) in the alcoholic beverages with various levels of sensitivity and selectivity of detection as well as the promptness in generating the results and the cost of studying one sample. Current work is devoted to the development of a rapid test for detecting the artificial colorants in wines. It is based on the method of the International Organization of Vine and Wine, the principle of which is to fixate the acidic artificial colorants on a specially prepared woolen thread when boiling the sample of wine. The modification of analytical procedure included the reduction of the test sample aliquot, the number of operations and the examination time without compromising the reliability of the conclusion. In order to imitate the color of red wines, Azorubine (E122), Allura Red AC (E129) and Indigo Carmine (E132) food colorants were used. The objects of the research were: model systems based on wine, white and red wines, counterfeit wines provided by the controlling authorities, and concentrated grape must. It was shown that in the genuine wines, depending on the color saturation of the test sample caused by natural anthocyanins, the woolen thread was discoloring from light to dark beige; its color was enhancing from pale pink to deep ruby with the increase in the content of AC in wine. The sensitivity of the proposed method made it possible to determine the presence of AC at the rate of 0.1-0.2 mg/dm3 in wines. The method did not require expensive equipment and could be used in the laboratories of winemaking industry or by the controlling authorities for establishing the fact of adulteration of alcoholic and juice products.
Microextraction flotamicroextraction flotation concentration and determination of chloroacetic acids in watertion concentration and determination of chloroacetic acids in water
Authors:   Lobachevsky State University of Nizhny Novgorod, Krylov V. A. , Mosyagin R.G. ,   Lobachevsky State University of Nizhny Novgorod
Published: July 2021

The flotation-assisted liquid-liquid microextraction method of mono-, di -, and trichloroacetic acids (CAAs) has been developed. Methyl tert-butyl ether (MTBE) was used as an extractant. The emulsification was performed by the ultrasonic irradiation. The microextraction procedure was carried out in a 27 ml special tube. It was equipped with the capillaries for sampling the extract and an air outlet. A salting-out additive (Na2SO4) was used to reduce the solubility of MTBE in water and to increase the extraction efficiency of CAAs. The air passage through the emulsion of the extractant was carried out using the eight-channel capillary bubbler. The organic matrix replacement was applied for ion chromatographic determination of CAAs with the conductivity detection. Current study showed the advantages of the flotation-assisted demulsification over the centrifugal one. The concentration factors of chlorinated acetic acids were 2-3 times higher. The detection limits of CAAs in water were reduced to (5·10-4 - 4·10-3 mg/l). The extraction time was reduced by more than three times. The trueness of the determination of HUC impurities was confirmed by the addition method. The statistical insignificance of the systematic error in comparison with the random error was shown. The developed method of preconcentration in combination with ion chromatography made it possible to determine the concentrations of CAAs 40-1250 times lower than the normalized SanPiN and WHO. This allowed conducting a highly sensitive determination of CAAs in water long before the onset of the critical ecological state.
Determination of formaldehyde in production solutions using the piezoelectric sensors
Authors:   Voronezh State University, Merenkova A. A. , Zhuzhukin K. V. ,   Voronezh State University of Forestry and Technologies Named after  G.F. Morozov, Zyablov A. N. ,   Voronezh State University, Belchinskaya L. I. ,   Voronezh State University of Forestry and Technologies Named after  G.F. Morozov
Published: July 2021

In the current work, piezoelectric sensors based on a molecular imprinted polymer (MIP) were obtained for determining the formaldehyde in the industrial solutions of a woodworking plant. The synthesis was carried out directly on the surface of the piezoelectric sensor. In the process of the two-stage thermoimidization of the obtained prepolymerization mixture, a molecular imprinted polyimide of formaldehyde was formed. For the analysis of the supra-resin part of the effluent of the Grafskaya kuhnya LLC (Voronezh) woodworking enterprise, which was obtained by the dry distillation of wood, the method of a calibration graph having a linear relationship was used; the coefficient of determination R2 = 0.97. The detection limit of the piezosensor was 0.6 ∙ 10–4 mol / dm3, the range of determined concentrations was 1.0 – 10–4 mol / dm3. The comparison of piezoelectric sensors based on the polymer without imprints and based on the polymer with imprints of formaldehyde showed high selectivity of the latter for the target molecule. The calculated imprinting factor was 28.3, the coefficient of selectivity with respect to phenol was 0.05, which indicated the selectivity of the modified sensor to formaldehyde. The verification of the correctness of the determination of formaldehyde in the model and production solutions was carried out using the "added-found" method. It was found that the MIP-based sensor was sensitive only to formaldehyde, the relative standard deviation did not exceed 2.0%. In order to assess the effect of the object matrix (formaldehyde) on the value of the resonant frequency, the standard addition method was used. It was determined that the matrix did not affect the value of the analytical signal, the relative standard deviation was 2.8%. For the re-analysis, the piezoelectric sensor was exposed to the regeneration in the oven at 50 ⁰С. The proposed method for determining the concentration of the formaldehyde using the MIP-sensor allowed controlling the content of the toxicant in the industrial solutions.
X-ray spectral analysis development in Novosibirsk city (Electron probe microanalysis and X-ray fluorescence analysis using the synchrotron radiation)
Authors:   Institute of the Earth’s Crust, SB RAS, Revenko A. G.
Published: July 2021

Current article considers the contribution of X-ray physicists from the city of Novosibirsk to the formation and development of the two X-ray spectral analysis directions: electron probe microanalysis and X-ray fluorescence analysis using the synchrotron radiation. The research on geological topics at the Institute of Geology and Geophysics of the Siberian Branch of the USSR Academy of Sciences using the MS-46 electron probe microanalyzer of the French company CAMECA (since 1967) served as the basis for the development of methods for the quantitative X-ray microanalysis of rock-forming minerals as the methods for quantitative determination of the contents of elements with low atomic numbers in the long-wavelength X-ray region were still in their infancy. With the development and the improvement of the method’s technical base (microprobes JXA-5A, JEOL, 1975; Kamebaks Micro, CAMECA, 1981; JXA-8100, JEOL, 2003; JXA-8230, JEOL, 2016; electronic computing), the software for controlling the operation of devices and converting the measured intensities of the analytical lines into the concentration of elements continued to changed and improve. The first results of elemental analysis, obtained using the synchrotron radiation to excite X-ray fluorescence at the VEPP-3 accelerating ring at the Institute of Nuclear Physics of the Siberian Branch of the USSR Academy of Sciences, were published in1977. Inthe following years, at the station of elemental SRXRF, samples of various nature were studied — biological (bio tissues of the heart, liver, lungs, hairs, bones, plants), geological, environmental objects (soils, sediments, aerosols, etc.), archaeological sites as well as new technological materials. The procedures for the determination of chemical elements in low-mass samples (milligrams) in unique samples of lunar soil samples, biopsy material of human myocardial tissues, etc. have been developed. The scanning device at the elemental SRXRF station made it possible to obtain the information for reconstructing the climate change for different periods of time – from 100 to 1000 years. A new non-destructive method of confocal X-ray microscopy for studying micro-objects and visualizing the distribution of chemical elements in extended objects on this station are currently being developed.
Lutetium oxide analysis by direct arc atomic emission spectrometry
Authors:   State Research and Design Institute of Rare Metal Industry Giredmet, Koshel E. S. , Arkhipenko A. A. ,   Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Baranovskaya V. B. ,   Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences
Published: July 2021

The requirements for the composition of initial oxides for the lutetium orthosilicate crystals are quite stringent: the content of the basic substance Lu2O3 is 99.999 wt%. Critical are coloring impurities: Fe, Ni, Cr, Co, Cu, V, Mn, the content of each should be no more than 0.0005 - 0.0010 wt%, Pr, Nd, Sm, Er, Tb, Yb no more than 0.0005 wt% for each one. It is also necessary to control the content of Al, As, Bi, Cd, Mg, Mo, Pb, Sb, Si, Sn, Ti, Zn, Y, La, Ce, Sc, Eu, Gd, Dy, Ho, Tm. To determine the impurity composition of lutetium oxide, one of the promising methods of analysis is direct arc atomic emission spectroscopy (DC Arc). The advantages of this method are the determination of the chemical composition without sample dissolution, a wide range of concentrations (10-6 - 10-1% wt%), a large number of determined elements. To realize the potential analytical capabilities of the method, the experimental conditions were studied: the interelectrode distance, the shape and size of graphite electrodes, the ratio of Lu2O3 to the spectral buffer, the type of carriers and operating modes of the generator. For most elements, the limits of determination are n ∙ 10-6 - n ∙ 10-4 wt%, that is significantly lower than in the current methods of DC Arc. The trueness of results is controlled by ICP-MS. The complex application of new approaches and modern capabilities of spectral equipment made it possible to develop a method with improved metrological characteristics.
“Aí começou a saga...”: fragilidade psicossocial na epidemia do vírus Zika
Authors: Azevedo Creuza da Silva , Freire Imara Moreira , Moura Luana Nogueira de Farias
Published: July 2021

O artigo é voltado para a experiência de fragilidade familiar e social de crianças com síndrome congênita do Zika vírus (SCZV) e discute as transformações das redes de apoio, seja no sentido de suas capacidades como também de precariedades. É um estudo qualitativo orientado pela abordagem clínica-psicossociológica. Foram analisadas as narrativas familiares de 32 encontros grupais realizados em ambulatório de um instituto de pesquisa referência para o atendimento da SCZV, localizado no Estado do Rio de Janeiro, Brasil. Apresenta-se parte dos resultados de uma pesquisa maior voltada para a compreensão dos efeitos psicossociais de adoecimento e seu impacto no exercício da parentalidade e do cuidado de crianças com SCZV. Considerou-se ao final que a experiência parental expressa processos complexos que revelam movimentos familiares e sociais de apoio e reconhecimento, mas também, em sentido oposto, de falta de continência a mães e pais que lutam por reconhecimento, inclusão social e direitos de seus filhos à saúde e educação.
Atenção primária à saúde em áreas rurais: acesso, organização e força de trabalho em saúde em revisão integrativa de literatura
Authors: Franco Cassiano Mendes , Lima Juliana Gagno , Giovanella Lígia
Published: July 2021

Em áreas rurais e remotas, a atenção primária à saúde é essencial para enfrentar iniquidades que marcam estes territórios. O conceito de ruralidade é pouco preciso e políticas voltadas à saúde rural no Brasil são frágeis. A revisão da literatura internacional pode apoiar uma maior compreensão sobre estratégias desenvolvidas em questões centrais da saúde rural. O objetivo deste artigo foi identificar e analisar os desafios do acesso, organização da atenção à saúde e a força de trabalho em saúde na atenção primária em áreas rurais. Foi feita uma revisão integrativa da literatura, com busca de artigos científicos publicados entre 2000 e 2019, nas bases Cochrane e MEDLINE e revistas específicas de saúde rural. A pesquisa resultou em 69 artigos, categorizados em acesso, organização à saúde e força de trabalho. Foram analisados os temas principais de seus achados. Os artigos classificados como acesso apresentaram entre os temas centrais: aspectos geográficos, necessidades de deslocamento dos usuários e acesso aos serviços hospitalares e especializados. Artigos da organização da atenção à saúde trataram de: estrutura e insumos, funcionamento dos serviços de saúde e gestão com base na comunidade. Em força de trabalho em saúde, destacou-se: perfil e papel profissional e fatores de atração/fixação. Ações transversais ao fortalecimento do acesso, organização à saúde e força de trabalho em saúde em áreas rurais foram: atuação comunitária, modelos de extensão/visitação, tecnologias de comunicação/informação, acesso à assistência e formação/desenvolvimento profissional. A revisão fornece compreensão abrangente da atenção primária na saúde rural em prol da equidade das populações rurais.
Evaluation of seasonal breeding of the domestic canary (Serinus canaria) in an artificial environment
Authors: Tamura Eduardo Koji , Iartelli Rodnei , Medeiros Paloma de Cassia Leite de , Mondes Pedro Henrique de Lima , Nakashima Fabio
Published: July 2021

ABSTRACT: The domestic canary (Serinus canaria) has been bred for hundreds of years to improve the quality of its plumage and its song. Reproduction in this species occurs seasonally, stimulated by a gradual increase in day length. Although, the occurrence of seasonal breeding in canaries is well known, whether canary reproduction can be manipulated remains unknown. Our objective was to determine whether the conditions of captivity (photoperiod and temperature) can be adjusted to enable canaries to reproduce outside of their natural breeding season. Thirty days before the natural breeding season, canary pairs were assigned and separated into three different groups: External Control (housed outdoors under ambient conditions), Artificial Control (housed artificially indoors under conditions similar to the external conditions), and Artificial Altered (housed artificially indoors for five months, with the photoperiod gradually manipulated to simulate that of the natural breeding season) groups. The number of clutches laid was greater in the Artificial Control than in External Control; however, more birds hatched in the External Control. In the Artificial Altered group, the beginning of the breeding season was delayed when the same parameters were used. Although, further research is needed, this study presents new data to assist in the development of protocols that entail gradual changes in environmental conditions to try to reduce the impacts of the processes on animal welfare.
Costs and financial viability of blueberry production in Pelotas
Authors: Oliveira Ícaro Pedroso de , Marques Léo Omar Duarte , Belarmino Luiz Clovis , Mello-Farias Paulo , Canever Mario Duarte
Published: July 2021

Resumo: O cultivo do mirtilo é uma atividade econômica recente no Brasil. O sistema produtivo e comercial ainda precisa de melhorias, principalmente para oferecer regularidade, qualidade produtiva e transparência de custos e preços. Não se tem conhecimento de estudos dedicados a analisar a viabilidade econômica da produção de mirtilo nas condições brasileiras. Portanto, o objetivo deste trabalho é levantar os custos e analisar a viabilidade econômico-financeira desta cultura em uma fazenda localizada em Pelotas (RS). A coleta e análise dos dados seguiram o procedimento adotado pela Matriz de Análise de Política e os indicadores de viabilidade utilizados foram o Valor Presente Líquido (VPL), a Taxa Interna de Retorno (TIR) e o Payback. Os resultados mostraram um custo de produção de US$ 7.394,61 por hectare ou US$ 2.310,88 por tonelada e viabilidade financeira na produção, dado que o VPL para o período de 10 anos foi de US$ 26.214,81, a TIR de 26,36%, a renda líquida foi de US$ 7.180,25 hectare/ano-1 e o Payback foi de 4,9 anos. Desse modo, a produção de mirtilo no sul do RS é lucrativa e a cadeia produtiva pode receber novos investimentos, segundo as condições tecnológicas e mercadológicas indicadas neste estudo.
Dialysis-related constrictive pericarditis: old enemies may sometimes come back
Authors: Neves Precil Diego Miranda de Menezes , Lario Fábio Cerqueira , Mohrbacher Sara , Ferreira Bernadete Maria Coelho , Sato Victor Augusto Hamamoto , Oliveira Érico Souza , Pereira Leonardo Victor Barbosa , Bales Alessandra Martins , Nardotto Luciana Loureiro , Ferreira Jéssica Nogueira , Cavalcante Lívia Barreira , Chocair Pedro Renato , Cuvello-Neto Américo Lourenço
Published: July 2021

ABSTRACT Cardiovascular disease is the main cause of death in patients with chronic kidney disease (CKD). Several heart conditions have been associated with CKD, including myocardial and pericardial diseases. This paper describes a case of Dialysis-related constrictive pericarditis in a patient diagnosed with sudden hypotension during a hemodialysis session. A 65-year-old man diagnosed with hypertension, diabetes, obesity, and cirrhosis on hemodialysis for two years complained of symptoms during one of his sessions described as malaise, lipothymia, and confusion. The patient had a record of poor compliance with the prescribed diet and missed dialysis sessions. He was sluggish during the physical examination, and presented hypophonetic heart sounds, a blood pressure of 50/30mmHg, and a prolonged capillary refill time. The patient was referred to the intensive care unit and was started on antibiotics and vasoactive drugs. His workup did not show signs of infection, while electrocardiography showed low QRS-wave voltage. His echocardiogram showed signs consistent with a thickened pericardium without pericardial effusion. Cardiac catheterization showed equalization of diastolic pressures in all heart chambers indicative of constrictive pericarditis. The patient underwent a pericardiectomy. Examination of surgical specimens indicated he had marked fibrosis and areas of dystrophic calcification without evidence of infection, consistent with Dialysis-related constrictive pericarditis. Hypotension for unknown causes must be considered in the differential diagnosis of dialysis patients.
AVALIAÇÃO DE CONTEXTO NA EDUCAÇÃO INFANTIL
Authors: Carmo Andréia do , Dias Julice
Published: July 2021

Este artigo é parte de uma pesquisa de Mestrado, vinculada à Universidade do Estado de Santa Catarina (UDESC), ao Programa de Pós-graduação em Educação, à linha de pesquisa Políticas Educacionais, Ensino e Formação e ao Grupo de Pesquisa Infância, Cidadania e Redes Educativas, desenvolvida numa instituição educativa de Educação Infantil da Rede Municipal de Ensino de Florianópolis (RMEF). Temos por objetivo apresentar os significados que o processo de compartilhamento reflexivo da Avaliação de Contexto na Educação Infantil assume em uma instituição educativa quando se faz uso de seus resultados em uma dimensão participativa e formativa. Metodologicamente, adotamos a perspectiva qualitativa utilizando a pesquisa - ação como método de procedimento e, enquanto geração de dados realizamos a técnica interativa de grupo focal. Na perspectiva de desenvolver um percurso participativo, portanto, democrático, lançamos o desafio complexo de olhar de dentro a própria prática pedagógica, interrogando-a, problematizando-a, tendo como referência a identidade institucional que a instituição educativa pretendia alcançar. A pesquisa potencializou o caráter formativo e em contexto da avaliação e constatou que o empoderamento das professoras como partícipes da avaliação, possibilitou a elas perceberem-se como autoras da própria prática para desencadear um processo de negociação para qualificar a prática pedagógica por meio da elaboração de um plano de melhorias. Nesse sentido, o estudo apontou a necessidade de que a avaliação da qualidade dos ambientes realizada nas instituições de Educação Infantil da RMEF tome parte das políticas públicas de avaliação, ancorada numa abordagem metodológica formativa e em contexto.
PERFIL DAS LICENCIANDAS EM MATEMÁTICA
Authors: De Almeida Dione Alves , Almeida Shirley Patrícia Nogueira de Castro e , Amorim Mônica Maria Teixeira
Published: July 2021

O presente artigo apresenta um estudo documental que tem por objetivo analisar o perfil das licenciandas em Matemática, levando em consideração os dados do Enade de Matemática, no período de 2005 a 2017. A partir da análise do conteúdo foi criado um composto por cinco elementos textuais, que foram tratados com as duas classificações (categorias). Sendo assim, buscou-se em suas cinco edições - 2005, 2008, 2011, 2014 e 2017 - evidenciar, sob a lente teórica dos estudos de Gênero e Educação Matemática, qual o perfil de mulher que estava se considerando no curso, tendo em conta a quantidade, idade, cor / raça / etnia, escolaridade dos pais (mãe e pai) e tipo de curso concluído no Ensino Médio. Os resultados indicados que os Relatórios do Enade adotam os conceitos de gênero esexo como sinônimos. Além disso, os dados ainda revelam que há uma predominância de mulheres brancas nos cursos, com idades médias de 18 a 24 anos, com poucos recursos financeiros e, por fim, com pais escolarizados até os Anos Iniciais do Ensino Fundamental.
Hospital de día en contexto de pandemia por COVID-19: experiencias de adolescentes asistiendo a intervenciones grupales telemáticas
Authors: Costa-Cordella Stefanella , Borgeaud Carmona Karin , Díaz Contreras Nicole , González Cano Ángela , Mazo Bontá Claudia , Cozzi Bas Amanda
Published: July 2021

Objetivo: explorar la experiencia de adolescentes usuarios del hospital de día que fueron parte de la adaptación telemática de las intervenciones grupales habituales de dicho hospital. Antecedente teóricos: los Hospitales de Día (HDD) son puntos de atención de hospitalización diurna y especializada cuyo objetivo es alcanzar la estabilización del usuario/a por medio de un tratamiento intensivo permaneciendo en su familia o comunidad. Los HDD en Chile son insuficientes. Una forma de ampliar la cobertura es la atención telemática, la que además se adapta a las limitaciones impuestas por la pandemia por COVID-19.  Sin embargo, no existen estudios sobre atención telemática de HDD en Chile. Material y Métodos: de los 13 usuarios de la intervención, 10 participaron en este estudio. Se realizaron entrevistas semi-estructuradas y encuestas autoaplicadas entre agosto 2020 y enero 2021.  Las entrevistas fueron analizadas utilizando Análisis de Contenido y las encuestas se analizaron con estadísticas descriptivas. Resultados: se aprecia una especial valoración de los/las participantes por las interacciones sociales positivas (con pares y terapeutas). Aparece una percepción general de haber mejorado en habilidades socioemocionales y estado de ánimo. La implementación telemática resultó satisfactoria para la mayoría de los participantes quienes proponen agregar actividades que promuevan interacciones más profundas con sus pares. Conclusión: los elementos centrales de esta intervención serían la percepción de apoyo social (posible mecanismo terapéutico) y la sensación de mejorar las habilidades sociales y el estado de ánimo (posible resultado principal).
Morphological and Structural Observation on the Rectum of Bolua turkiyae Ünal, 1999 (Orthoptera, Tettigoniidae)
Authors: AMUTKAN MUTLU Damla , POLAT Irmak , SULUDERE Zekiye
Published: July 2021

This study presents the morphology and structure of the rectum in Bolua turkiyae Ünal, 1999 (Orthoptera, Tettigoniidae) using light and scanning electron microscopy. The digestive system in insects is split up three parts as the foregut, the midgut and the hindgut. The rectum is last part of the hindgut. The results show that the rectum of B. turkiyae consists of 6 rectal pads, in similar to rectal pads found in others Orthopteran species. The rectum contains the muscle tissue with connective tissue, epithelial layer with columnar cells, and the cuticular intima from the outside to inside. There is microvillus on the apical side of the columnar cells that serves in water and ion reabsorption.
Assessment of Sorbate and Benzoate Content in Mustard, Ketchup and Tomato Sauce by Sub-Minute Capillary Electrophoresis
Authors: Morilla Pereira Lais , Della Betta Fabiana , Tischer Seraglio Siluana Katia , Schulz Mayara , Nehring Priscila , Gonzaga Luciano Valdemiro , Fett Roseane , Oliveira Costa Ana Carolina
Published: July 2021

Research background. Sorbate and benzoate are important preservatives in food products, but these compounds can also have genotoxic effects, causing health risks to consumers. In this regard, this study aims to determine the mass fractions of sorbate and benzoate in Brazilian samples of mustard, ketchup and tomato sauce using an adequately validated sub-minute capillary electrophoresis method.
Experimental approach. In this study, sorbate and benzoate were evaluated in sauce samples by capillary electrophoresis using a simple sample preparation procedure. Previously, the method was validated according to Eurachem guidelines, and its greenness was assessed by Eco-Scale.
Results and conclusions. The fitness for purpose of the method, as well as its suitability for the analysis of the studied matrices and its agreement with the principles of green chemistry were checked and confirmed. Also, according to our findings, among the 30 commercial samples assessed, six of them presented some mislabeling or non-compliance with European or Brazilian legislation, reinforcing the constant need for quality assessment and surveillance of food products.
Novelty and scientific contribution. So far, there have been few studies related to investigating the preservatives such as sorbate and benzoate in mustard, ketchup and tomato sauce, highlighting the significance and contribution of the obtained results to the knowledge in the field.