bluuebunny/crossref_metadata_2025 huggingface dataset:
Foliar Fertilization Effect of Supplementing the Fertilization of the Soil on the Production of Potato Tubers
Authors: TOADER Constantin , RUSU Mihai , MĂRGHITAŞ Marilena , MIHAI Mihaela
Published: December 2021

Present worldwide debate, including certain national approaches, lead to highly diversified tendencies for the implementation of agricultural systems involving a higher or lesser role played by fertilizer employment in their success, but they are all called to make a contribution to the achievement of qualitative and quantitative food quantities, while increasing soil fertility and environmental protection. In terms of scientific fundamentals with regard to complex food chain effects, all agricultural systems are perfectible and thus make it impossible for an ultimate and complete achievement of objectives set by human society, cosumers and soil fertility increase requirements.

Potato crop fertilizer application does not always bear the mark of the agricultural systems in terms of varieties, content and doses applied, as the purpose and importance of this crop frequently determines attention granted to the achievement of high production results that are much better than in other plants. In this context, the objectives of our research, as well as the research-experiment of the effect of foliar fertilizer assortments ultimately provide applicable variants for agricultural practice that are applied on the inside and the outside of the practised agricultural system.

The present paper aims at preseting the results obtained by applying a wide range of foliar fertilizers on the Redsec variety, during the 2005, 2006 and 2007, when the productive effect of these fertilizers was highlighted and differentiated according to the fertilizer assortment and conditions of application.

Differentiation of effects obtained by foliar fertilizer application and the level of tuber production are dependant on the application of these fertilizers through varieties exhibiting an essential macroelement nutritive balance or i the particular coposition, there is a predominance of nitrogen presence and concentration (such assortments like Lecol, Folifert and Fortifert). These results show that the effect of foliar fertilizers applied is first due to the involvement of these compositions within the nitrogen cycle and its assimilatio that can be capitalized at an optimal level through the simultaneous representation of phosphorus and potassium in their composition.
Preliminary Research Concerning the Determination of Beer Wort Flavor Compounds During Primary Fermentation
Authors: MICHIU Delia , TOFANA Maria , MUDURA Elena , MUNTEAN Florina
Published: December 2021

Generally beer contain numerous aromatic compounds, some naturally present in the raw materials and some formed during processing. In this work were analysed beer wort flavor compounds, during primary fermentation, taking into study two beer wort types: one obtained from Pilsner malt (100%), other from a mixture of Pilsner malt (80%) and Caramel Malt (20%). An Shimadzu GC/MS-QP2010 equipment was used for samples analysis. The major compounds founded in beer wort samples, was derived from a vast array of compounds that arise from a number of sources. In this way, during fermentation and conditioning we founded different categories of secondary products: higher alcohols, esters, vicinal diketones (VDK), organic acids and aldehydes. The concentration of this aroma compounds depends on malt type and the moment of wort examination. Was noticed that some compounds disappeared and others appeared, from the day to day of primary fermentation.
Researches Regarding the Processing of the Hemp Seed by Cold Pressing
Authors: MORAR Maria Virginia , DRAGAN Katalin , BELE Constantin , MATEA Cristian , TARTA Iustin , SUHAROVSCHI Ramona , SEMENIUC Cristina
Published: December 2021

The hemp (Cannabis sativa L.) seeds present an important raw material resource for the industry due to processing possibilities of plants components. The hemp oil and the pressing cake resulted by the cold pressing of the hemp presents excellent alimentary and therapeutic properties.

The purpose of the research was to study the technology of obtaining of the hemp oil by cold pressing of the seeds, the influence of the process parameters and raw materials quality upon the products quality.

The pressing was made with screw press of small using press nozzle in diameters of 5, 6, 7, 8 and 10 mm. For the hemp seed there were determined the organoleptic characteristics (total volatile matter and the raw fat content by Soxhlet extraction). For the hemp oil there were determined the acid value and the peroxide value. There werde determined the working parameters of the press (the rate efficiency and the productivity of the press).

The results emphasized important data for the practice. The fat content of the seed was between 30,89 and 33,25 % and the volatile matter was between 90,42 and 93,68 %. The rate efficieny of the cold pressing of the hemp seed was between 23,89 and 27,69 % obtained oil, being influenced by the characteristics of the seeds. The pressing process was also influenced by the quality of the seed, presenting optimal values in the case of using pressing nozzle 8 and 10 mm in diameter. The acid values of the hemp oil was between 0,65 and 4,45 mg KOH/g oil and the peroxide values was between 0,62 and 26,91 mEg O2/g. Further studies are recommended be made and there are the initiations of ab informational programme, in order to inform the farmers and consumer about the benefic and therapeutic effects of the hemp oil upon the health.
Studies on Physicochemical and Sensory Attributes of New Varieties of Mustard Cream
Authors: MUSTE Sevastita , CERBU Andruta Elena , MURESAN Crina , MAN Simona , MURESAN Vlad , BIROU(POP) Anamaria , CHIRCU Carmen
Published: December 2021

The paper presents methods for obtaining table mustard and other three new varieties: rosemary mustard, mint mustard, fennel mustard and also their physico-chemical, microbiological and sensory characterization.

After the determinations made, both raw materials and finished product quality parameters obtained are superior to existing assortments. Results of microbiological determinations for all 4 types of mustard studied are within the standards.

Scores obtained from sensory analysis was: classic table mustard 4.15 (max. 5 points), followed by fennel mustard - 4.02, rosemary mustard - 3.98 and mint mustard - 3.96.
Monitoring a Biotechnological Process in a Biofermentor to Obtain a Dairy Product Using Brewer’s Yeasts
Authors: PAUCEAN Adriana , VODNAR Dan , MUDURA Elena , JIMBOREAN Mirela , SOCACIU Carmen , BRATFALEAN Dorina
Published: December 2021

Dairy products may go beyond the borders of nutritional value and become functional products if the fermentation process is performed in the best available manner. Our study monitories the process parameters and their variation during the fermentation time of milk incubated with a complex mixture of microorganisms formed by: a lactic culture, kefir-yeast culture and brewer’s yeasts sampled from the secondary fermentation of beer. The study was realized using a Tryton- Pierre Guerin Technologies biofermentor. The results were correlated with the development dynamics of lactic bacteria and yeasts population during 24 hr of fermentation. The pH level variation is typical for kefir-like products. The oxygen content during fermentation is a competitive factor for the two species of microorganisms featuring in our research: Lactococcus lactis and Saccharomyces cerevisiae. In this situation the semi-anaerobic environment insures the fastest rate of acidification for milk and the Saccharomyces cerevisiae yeasts did not display a fermentation metabolism but maintain their viability.
Researches on the Somatic Cells in Buffalo Cow Milk and Their Significance
Authors: STETCA Gheorghe , CHINDRIS Vasile , POP Anamaria
Published: December 2021

It has been proved that there is a direct correlation between the somatic cells within the buffalo cow milk and the health state of the mammary gland.

The presence of somatic cells in the milk has a hygienic significance in tracking down subclinical mastitis which often develops.

The number of somatic cells in the buffalo cow milk is considered a more sensible test than determining the percentage of chloride, the value of lactose, the value of serum albumin, the measurement of electric conductibility and of enzymatic activity
On the Development of Traditional and Spatial Databases of MEMDUR System
Authors: CÂRSTOIU Dorin , GORGHIU Gabriel , RISTEA Cătălin
Published: December 2021

The MEMDUR system was designed as an advanced management system that has to ensure a clear evaluation of the environmental risk being able to administrate the crises, having in view the actual requirements claimed by the sustainable development at local, regional and national level. The paper emphasizes on the stage of development of the most important system components: the traditional relational database (on the one hand) and spatial database (on the other hand). The traditional relational database has the management role of the recorded data collected from the measuring workstations. The spatial database (defined as a GIS one) combines the spatial entities (as they are met in nature) with the textual data. Complete data allow the designing of complex reports, making thematic maps, spatial correlations etc.
Aspects Concerning the Development of the MEMDUR System
Authors: GORGHIU Gabriel , RISTEA Cătălin , NICOLESCU Carmen Leane
Published: December 2021

. The MEMDUR system has been created and developed with the aim to offer an image of the air pollution in the area of Targoviste city. A spatial database and a mathematical model represent the core structure of the system. The spatial database was designed in SQL Server. Using GeoMedia, the spatial entities were defined taking into account the global coordinate system. The data, collected from different sources, are imported into the GeoMedia workspace and then exported to SQL Server database, generating a geometric entity, automatically. The mathematical model provides an analyze of the pollution status for CO, NO, NO2, SO2 and PM10 dusts, comparing their values with the hourly maximum admitted concentrations. For establishing the areas were the level of pollution generated by the stationary pollution sources is at maximum level, the model incorporates source-related and meteorological factors. Once the pollutant concentration in the DTM points was determined, it is possible to show different forms of concentration distribution on the areas of interest. Spatial queries can be made between the areas with concentrations in a given interval and in the entities of interest. There is presented a simulation of a hypothetical situation of a pollution accident to demonstrate the model efficiency, the visual representation of the pollutant concentration and the used symbols, which show the movement gradient of the pollutant. The on-line web publishing system was performed using GeoMedia WebMap application. The system interface offers the possibility to open and consult the designed database and visualize a graphical representation of the area of interest and the technical attributes of the objects or events registered in the critical points.
Effect of Some Metals Like the Cu, Fe and Zn in the Grop of Rice Irrigated with Urban Waste Waters in Albufera of Valencia (Spain)
Authors: MARTÍNEZ-CORTIJO F. Javier , SENDRA Fernando , MARCO Juan
Published: December 2021

This study wants to establish the effects of urban waste water irrigation on the cultivation of rice for heavy metal contamination: in particular, copper (Cu), iron (Fe) and zinc (Zn). The research studies the evolution along an irrigation line, so take nine plots along it, and the levels of these elements is checked, in root, stem and grain. It is compared with other irrigation waters from different sources, with the parallel study, which analyzed other soil and water in order to determine the interaction soil-plant-water. Finally, under the conditions of the experiment, basic soils and Mediterranean conditions do not pass the relevant quantities that could endanger the consumer.
Production of Microbial Exopolysaccharides in Rye Sourdough
Authors: VASILEAN Ina , NEAGU Corina , APRODU Iuliana , BANU Iuliana
Published: December 2021

It is well know that the use of surdough is essential for rye bread making. Some bacterial starter cultures have the abilities to synthesize the homoexopolysaccharides (HoPS) in sourdoughs. The HoPS improve the texture, quality and shelf life of bread, and are known to have prebiotic behavior.

The aim of our study was to investigate the abilities of six starter strains of lactic acid bacteria (LAB) to produce HoPS in sourdoughs. Four starter strains from MIUG collection Weissella confusa (UGAL1), Lactococcus lactis ssp. Lactis (UGAL2), Lactobacillus plantarum (15GAL), Lactobacillus brevis (16GAL), and two comercial strains Lactobacillus plantarum and Lactobacillus brevis (DI-PROX MTTX) and Lactobacillus helveticus (LH-B02), were used. The sourdougs were prepared using whole meal rye; the dough yield was 300. After 20 hours of fermentation at 37°C the HoPS were separated, and after acid hydrolysis the monosaccharides were quantified using enzymatic UV method, and by high-performance liquid chromatography.

The total water-soluble polysaccharides content from sourdough was determined by phenol-sulfuric acid method. Excepting the 15GAL and 16GAL strains, all other tested LAB are HoPS-producing. The levels of HoPS ranged between 0.88 to 1.75 mg/g of whole rye flour.
Levels of Salt in Romanian Food in 2009
Authors: ZUGRAVU Corina Aurelia , PARVU Monica , TARCEA Monica , PATRASCU Daniela , STOIAN Anca
Published: December 2021

Salt is the oldest preservative used for food. But the excessive consume of salt is at the origin of blood hypertension, a problem responsible for a huge number of human diseases and deaths. As a consequence, the level of salt added in processed food has to diminish progressively.

At the end of 2009, the Public Health Authorities from 29 Romanian counties reported results from the salt analysis of 1321 samples of different foods.

The highest levels of salt were found in “telemea” cheese and the significant salt content in other widely consumed food underlined the necessity for a joined effort in order to bring down salt and to comply with the World Health Organization target
Monitoring the Macrozoobenthos of the Sasar River Basin, Based on Some Ecologic Indices
Authors: MARE ROŞCA Oana , MIHALESCU Lucia
Published: December 2021

The hydrographic basin of the Sasar River is located in the North-Western part of Romania, and it totalizes 311 km2. A large part of the catchment basin is within the mining perimeter of Baia Mare; the Sasar River is its main drainage axis. Subsequent to the systematic studies of 2003-2006, 74 taxons were identified.
Oxidation of pyrite (FeS2) and troilite (FeS) impurities in kaolinitic clays after calcination
Authors: Zunino Franco , Scrivener Karen
Published: December 2021

Valorisation of locally available clays for producing blended cements is crucial for a widespread adoption of sustainable binders incorporating these materials. In some places, clays can be intermixed with small amounts of iron sulfides, which could eventually expand in the alkaline media of concrete and lead to cracking if clay particles are sufficiently fine. This study explored the stability of iron sulfides, namely troilite and pyrite, during calcination of clays and their influence in reactivity. It was found that both troilite and pyrite decompose and oxidize into hematite under typical calcination conditions for clays. Furthermore, there is no negative influence of the presence of iron sulfide phases on the reactivity of calcined clays. This shows that these clays are suitable for use in blended cements, provided that adequate quality control is conducted to ensure a complete decomposition of the iron sulfide phases.
Case studies on seismic assessment of historical buildings using advanced analysis
Authors: Grant Damian N , Dozio Daniele , Fici Paolo , Sturt Richard
Published: December 2021

Seismic risk mitigation in existing buildings requires an engineering assessment of the current condition and expected seismic performance and an identification of possible deficiencies that should be addressed. For heritage and historical buildings in particular, there is significant benefit in using the most detailed analysis methods available to avoid the conservatism inherent in simpler methods and thereby minimise unnecessary interventions and more precisely pinpoint where strengthening is required. On recent heritage projects, Arup has used the analysis software LS-DYNA and a new material model, calibrated against experimental tests on unreinforced masonry components and buildings to carry out (or supplement) seismic assessments. The analysis method (non-linear response history analysis) is not new, but its application on detailed finite-element models of complex historic structures has previously been computationally prohibitive and requires significant analyst experience to deliver reliable results. This paper summarises three of these recent Arup projects: Woltersum Church (the Netherlands), Procuratie Vecchie (Venice) and a building cluster in the historical centre of Appingedam (the Netherlands). The case studies show that these analyses allow complex features of seismic performance to be considered, such as damage or modifications to the building over time, pounding (separate buildings colliding into one another due to seismic movements) and load sharing between adjacent structures.
Variáveis institucionais explicativas do desempenho de estudantes de Ciências Contábeis e Administração
Authors: Nasu Vitor Hideo , Silva Breno Gabriel da , Borges Yana Miranda , Melo Brian Alvarez Ribeiro de
Published: December 2021

O objetivo deste estudo foi analisar a associação entre variáveis institucionais e o desempenho de estudantes de ciências contábeis e administração. Foram utilizados os microdados do Enade 2018, obtendo-se 152.491 observações válidas. O desempenho foi mensurado de três formas: desempenho final, desempenho na prova de formação geral e desempenho na prova de componente específico. Ademais, foram consideradas as seguintes variáveis institucionais: organização acadêmica, região, modalidade e turno. Os dados foram examinados a partir de modelos de regressão Box Cox Cole Green (BCCG) com zeros ajustados. A partir dos resultados, concluiu-se que as variáveis institucionais foram relevantes para explicar o desempenho. Especificamente, destaca-se que os estudantes matriculados em centros federais de educação tecnológica tiveram desempenho superior aos das outras formas de organização acadêmica. Outro ponto é que os alunos da região Norte performaram pior do que o das outras regiões de modo geral. Todavia, superaram os alunos da região Centro-Oeste nas questões de formação geral. Quanto à modalidade de ensino, verificou-se que alunos do ensino presencial apresentaram performance superior a dos estudantes do ensino a distância (EaD). E os alunos do turno integral tiveram melhores performances de modo geral. Como implicações, aponta-se que as instituições que oferecem cursos de contabilidade e administração na região Norte podem querer aprimorar a qualidade do ensino, assim como as do Centro-Oeste podem querer fazê-lo em relação ao ensino de formação geral. Da mesma forma, o ensino da modalidade EaD pode ser aprimorado e a oferta de cursos em período integral pode ser pensada e, potencialmente, implantada.
ASOINCA: un sindicato docente con propuesta pedagógica
Authors: González Terreros Maria Isabel , Aguilera Morales Alcira
Published: December 2021

Este artículo de investigación explora una de las facetas menos abordada en el sindicalismo magisterial, la cual es aquella asociada a su identidad pedagógica. En ese sentido, queremos mostrar que, pese a la crisis del sindicalismo y en particular del magisterial, algunos sindicatos, como en el caso de la Asociación de Institutores y Trabajadores de la Educación del Cauca (ASOINCA) en Colombia, vienen realizando apuestas pedagógico-políticas que contribuyen al fortalecimiento de los maestros, de las escuelas y del sindicato en particular. Los grupos sindicales se constituyen, entonces, en movilizaciones sociales por la educación que se vinculan y van más allá de las reivindicaciones gremiales propias del sindicalismo en general, posibilitando afianzar una relación identitaria con una postura político-pedagógica de la labor docente.
Ciencia, cuerpo, control y resistencia: una mirada crítica de Orphan Black
Authors: Lozano Alvarez Karen Cristina
Published: December 2021

La revolución digital ha transformado las prácticas lectoras debido a la inserción de un nuevo ecosistema audiovisual, donde la imagen presentada en una pantalla ha destronado a la palabra, por lo que los textos multimodales como las películas y las series son, hoy día, los productos semióticos-discursivos más consumidos, los cuales como todo producto de la cultura, guardan un (querer) decir. Por ello, el propósito de este artículo de reflexión es realizar una lectura crítica de Orphan Black (2013-2017), desde el enfoque teórico metodológico que pertenece a la corriente del análisis crítico del discurso (Van Dijk, 2016), que ponga de manifiesto cómo este texto cuestiona cuáles deberían ser los preceptos éticos y los límites de la ciencia, denuncia las formas en que se conciben los cuerpos de los otros y las prácticas que se han mantenido y renovado para asegurar el control social, exponiendo formas de resistencia para conseguir la libertad con el fin de incitar a leer lo implícito de estas narrativas y no caer en la ingenuidad.
Enrique Olaya Herrera y su apoyo a los intereses estadounidenses en Colombia: los documentos que el Departamento de Estado no quiso revelar
Authors: Atehortúa-Cruz Adolfo León , Kern Gudrun
Published: December 2021

En el presente artículo de investigación se propone abordar un importante periodo en las relaciones entre Estados Unidos y Colombia. Luego del malestar creado por la pérdida de Panamá, la presidencia de Enrique Olaya Herrera logró cerrar toda prevención o herida en las élites nacionales y propició la más cerrada y leonina defensa que de los intereses estadounidenses en Colombia se hubiera hecho durante las primeras décadas del siglo XX. Para argumentar tal hipótesis, el artículo expone brevemente las condiciones que precedieron al Gobierno de Olaya: su elección como presidente en medio de cruciales acuerdos —explícitos e implícitos— con banqueros, empresas petroleras y burócratas estatales en Washington y, finalmente, su decisivo papel en la máxima magistratura. Apoyado en la bibliografía existente, en observación de prensa, pero sobre todo en documentos hasta ahora inéditos del Archivo Nacional de Estados Unidos, el artículo deja en claro lo sucedido, al tiempo que analiza y reproduce sustancialmente documentos que en su momento el Departamento de Estado de los Estados Unidos se negó a publicar para no perjudicar las relaciones entre los dos países, protegiendo a algunos de sus altos funcionarios y evitando una fuerte oposición en contra de Olaya Herrera en Colombia.
La lectura del libro álbum como mediación hacia el desarrollo socioemocional
Authors: Rodríguez Turriago Karen Lorena , Camargo Martínez Zahyra , Uribe Álvarez Graciela
Published: December 2021

El presente artículo de revisión examina la relación entre la comprensión de textos narrativos literarios (libro-álbum) y el desarrollo de habilidades socioemocionales en niños de educación básica primaria. El objetivo de este artículo es determinar si en efecto existe esta relación y cuál es su influencia en los procesos de aprendizaje de la literatura; de igual manera, presenta el estudio de 50 textos académicos, localizados, fundamentalmente, en el contexto hispanohablante durante los últimos 20 años. La metodología implementada para la búsqueda se basó en la consulta estratégica de fuentes, así como en los criterios de validez del corpus documental. Tras estas consideraciones, emergen tres categorías principales: libro-álbum (18), competencia literaria (19), competencia emocional y educación (13). Del análisis realizado, se desprende la necesidad de vincular la literatura infantil con la mediación del libro-álbum y el desarrollo de las habilidades socioemocionales en los niños, con la perspectiva de estimular algunas actitudes que les ayuden a comprenderse a sí mismos y a su entorno, desde lo afectivo, lo estético, el goce y el placer por la literatura.
“Esto es tierra de nadie”: alegoría urbana de un conflicto eterno en una barriada bogotana; una lectura de la película colombiana Como el gato y el ratón
Authors: Bernal Álvaro Antonio
Published: December 2021

En la película colombiana Como el gato y el ratón (2002) se representa la vida cotidiana de un barrio de invasión en las fronteras de Bogotá, donde a través de una serie de sucesivas luchas comunitarias en busca de mejores condiciones de vida para los habitantes de la zona, los ideales de progreso se pierden y se termina en un círculo interminable de violencia. Este artículo analiza la estética realista del filme a partir de las relaciones vecinales dentro de un contexto de marginalidad, y en función a la perspectiva que representa: una alegoría urbana de nuestros conflictos históricos. Se propone, entonces, que la trama de la historia resulta ser una metáfora, una representación, un espejo de las disputas crónicas de nuestra sociedad.
Impacto del uso de rúbricas de autoevaluación y coevaluación sobre el desempeño escritural de docentes en formación
Authors: Buitrago Ortíz Andrea Marcela , Camargo Uribe Angela , Rincón Camacho Lida Johanna
Published: December 2021

Este artículo presenta los resultados de un estudio cuyo objetivo fue analizar el impacto del uso de rúbricas de autoevaluación y coevaluación, sobre el desempeño escritural y la percepción acerca de esta estrategia evaluativa en estudiantes universitarios que se forman como docentes. La metodología de la investigación fue analítica con un diseño cuasiexperimental de tipo mixto, de la cual un total de 54 estudiantes participaron en el estudio, divididos en tres grupos: dos experimentales y uno de control. Para el análisis estadístico se empleó el ANOVA de una vía para examinar tanto las condiciones iniciales, como después de la intervención de los tres grupos. Para establecer las diferencias intragrupo y el índice de mejora, se empleó la prueba T de Student para muestras relacionadas. Los resultados, tanto cualitativos como cuantitativos, muestran que el uso de rúbricas de autoevaluación impacta positivamente el desempeño escritural. El análisis de las percepciones sobre las rúbricas de auto y coevaluación indica que estas permiten comprometer a los estudiantes con su propia formación como escritores y adquirir conciencia de la dimensión evaluativa como parte constitutiva del proceso escritural.
Conceptualización del comportamiento de los electrones según el enfoque de Feynman: un estudio en la escuela media colombiana
Authors: Alvarado-Puentes Keidy Alejandra , Fanaro María de los Ángeles
Published: December 2021

Este artículo de investigación analiza la conceptualización que hacen 118 estudiantes del último año de una escuela secundaria colombiana cuando afrontan un conjunto de situaciones didácticas acerca de mecánica cuántica, relativas a los electrones adoptando el enfoque de Feynman. Se sintetiza la secuencia didáctica implementada señalando los conceptos e ideas científicas que esta pretende hacer emerger. Luego se presenta el análisis de la conceptualización desde la teoría de los campos conceptuales de Vergnaud, en el que se identificaron los obstáculos y las ayudas en la conceptualización con base en un análisis de correspondencias múltiples, y una tipología de las resoluciones. Los resultados permiten concluir que la secuencia resultó viable, siendo detectados como principales obstáculos la manipulación de la técnica de cálculo de probabilidad propuesta, la interpretación del modelo de la función de probabilidad para canicas; además la familiaridad del profesor con la secuencia didáctica incidió en la conceptualización.
Cultura de la enseñaza del álgebra en contextos marginalizados
Authors: Valoyes Chávez Luz Edith , Zapata-Ramos Paola Andrea
Published: December 2021

El álgebra ocupa un lugar privilegiado en el currículo escolar. Además, es considerada como puerta de acceso a la educación superior. Sin embargo, estudios demuestran las dificultades en su aprendizaje, las cuales parecen afectar especialmente a estudiantes históricamente marginalizados. En este artículo exploramos el papel de las prácticas de enseñanza del álgebra en la constitución y reproducción de inequidades en el acceso al conocimiento algebraico. Para ello, introducimos una noción de “cultura de la matemáticas escolares” que permite analizar las prácticas de enseñanza de José, maestro en una escuela ubicada en un sector marginal. Usamos la técnica cualitativa del estudio de casos y un enfoque interpretativo al análisis de los datos. Los resultados muestran el papel de representaciones estereotipadas sobre los y las estudiantes en la configuración de las prácticas de enseñanza, las cuales determinan el desarrollo del pensamiento algebraico y el acceso al conocimiento algebraico de estudiantes históricamente marginalizados.
Algunas características del contexto ambiental del colegio Tabora para proyectar la formación ecociudadana de estudiantes de grado quinto
Authors: Bonilla-Mendoza Yaquelin Nayibe , Garzón-Barragán Isabel
Published: December 2021

En la enseñanza de las ciencias naturales y la educación ambiental, existe consenso en considerar el contexto escolar para diseñar propuestas de formación en el aula, más aún si están dirigidas a estudiantes de básica primaria. Al respecto, este artículo de investigación presenta algunas características del contexto ambiental del colegio Tabora, institución educativa distrital de Bogotá, como marco para relacionar la formación ambiental con la científica y la ecociudadana, para estudiantes de quinto grado. Dichas características se establecen a partir del análisis cualitativo descriptivo de las respuestas a un cuestionario aplicado a los estudiantes de este grado y el análisis de contenido de tres documentos: el proyecto ambiental escolar (PRAE) del colegio Tabora, el diagnóstico de los prae de la localidad de Engativá y el Estudio para la identificación de tendencias en educación ambiental en Bogotá. De los resultados y conclusiones se destaca la posibilidad de generar propuestas innovadoras en este colegio para la educación primaria ecocientífica desde el liderazgo de los docentes y el interés por la reflexión sobre los problemas socioambientales, asociando la formación humana a interrelaciones entre el territorio, la sociedad y el ambiente.
La formación de los futuros profesores de física en contexto de incertidumbre: experiencia de la práctica docente d-learning
Authors: Salica Marcelo
Published: December 2021

Ante el disruptivo escenario educativo provocado por la crisis sanitaria causada por el covid-19, los diferentes niveles educativos se vieron obligados a pasar de la educación presencial a una enseñanza remota de emergencia. Como consecuencia, la práctica docente de los futuros profesores de física para la educación secundaria se debió realizar en un escenario de excepcionalidad e hipercomplejidad. Contexto socioeducativo caracterizado por las intercomunicaciones virtuales en condiciones de aislamiento y distanciamiento socioeducativo. Para afrontarla, la formación del profesorado se basó en una experiencia d-learning. Ante dicho desafío, este artículo de reporte de caso educativo, sistematiza y analiza una experiencia tecnopedagógica d-learning y los dispositivos de registro de la práctica docente utilizados. Los resultados de la experiencia enfatizan en la necesidad de implementar modelos de formación que integren las características del escenario de formación en la matriz educativa para promover una alfabetización profesional crítica fundamentada en el conocimiento profesional del profesorado y el conocimiento tecnológico pedagógico del contenido.
Acoustic quality assessment in a classroom through simulations and measurements
Authors: Nascimento Eriberto Oliveira do , Zannin Paulo Henrique Trombetta
Published: December 2021

The acoustic quality in a classroom directly impacts the educational relationship between the student and the teacher, reducing speech intelligibility. In addition, inadequate acoustic comfort burdens the vocal health of teachers. This study evaluated a classroom at the Federal University of Paraná, Campus Centro Politécnico, to verify its acoustic quality. The measurements of the acoustics descriptors: Reverberation Time (RT), Definition (D50), Central Time (Ts), Early Decay Time (EDT) were performed according to the ISO 3382-2 standard, concerning Noise Curves (NC) and Background Noise (BGN) these were evaluated by the  NBR 10152 and S12.2 standards. The Speech Transmission Index (STI) was measured according to IEC 60268-16 and evaluated according to ISO 9921. The useful-detrimental ratio (U50) and the other descriptors were simulated in the ODEON software version 11. Thus, the results showed that the evaluated room did not meet the minimum requirements in terms of acoustic quality, for the descriptors RT, STI, Ts, D50, RF, and NC. Simultaneously, the RT and STI were also outside the limits established by the German and Finnish standards. Therefore, it is concluded that the evaluated classroom did not reach the minimum acoustic quality requirements.
Analysis of the current scenario of Compressed Earth Block (CEB) production
Authors: Antonelli Jeferson Fernando Corrêa , Azambuja Maximiliano dos Anjos
Published: December 2021

The main objective of this study is to identify the parameters that influence the quality of the production of compressed earth blocks (CEB). Thus, an analysis of the performance of the materials that make up the final product was carried out, such as the binders that act as chemical stabilizers and the different types of soils, also the mechanical resistance and durability tests and finally the technical standards for its manufacturing. For this aim, a literature review was carried out in three electronic databases, Scopus, Web of Science and Scielo. The results showed environmental concerns with the use of Portland cement for stabilization, therefore, 18% of the studies used agricultural residues and 25% used mineral by-products, for partial or total replacement of Portland cement. Soils with plasticity indexes between 15% and 30% have a stabilization success rate of 69%, while soils with plasticity index less than 15% have a stabilization greater than 93%, which can be increased to 100% if the soil have a percentage of clay and silt between 21 and 35%. On the other hand, a plasticity index above 30% negatively affects stabilization. The compaction energy applied in the manufacture of CEB is an important parameter, as it influences the density, thermal conductivity and mechanical strength. Among the sustainable construction techniques, CEB is a great option, as it can be done locally and with ease of construction.
Walking as an intervention
Authors: Souza Lucas do Nascimento , Fiorin Evandro , Rodrigues Laís da Silva
Published: December 2021

How to analyze urban areas in the contemporary modern city upon the plurality of forms of appropriation of public spaces? This paper seeks to contribute to qualitative studies on urban perception through the method of cartography. Thus, this writing does not deal with the search for information or data collection, but with the immersion in the ongoing process present in the territory of the old railway bed in the city of Bauru-SP. The text highlights a research practice little explored in this spatial cutout, which tends to contribute to the impact on urban perception and future interventions in this area, as the decanted sociospatial layers are revolved and an urban imaginary little explored is accessed through the development as a research modality.
The Conservation Management of Engenho Uchôa Wildlife Refuge as a Natural Heritage
Authors: Moura Célio Henrique Rocha , Araujo Felipe Moura Hemetério , Albuquerque Caio Coelho Silva
Published: December 2021

From the perspective of United Statian preservationism, where the presence of human beings in areas understood as natural was opposed, the first protected areas in Brazil appear at the threshold of the discussion on the protection of the country's ecosystems, where the dichotomy between man and nature is admitted, and through which instruments for the management of Brazilian biomes and ecosystems are developed. This article discusses the nature management model in Brazil, contrasting traditional management (through the provisions of the National System of Conservation Units / SNUC and which reverberates to State and Municipal Systems) and the conservation management, understood as the modality of management that acts on the patrimonial dimension of nature. This discussion permeates the definitions of Natural Significance, Conservation and Natural Heritage in the Australian Natural Heritage Charter (IUCN, 2002), and through the example of the Mata do Engenho Uchôa Wildlife Refuge (RVSMEU), a state conservation unit by the State System of Conservation Units of Pernambuco / SEUC, it is discussed how the current ecosystem management plan approaches and distances itself from the conservation management of its heritage values.
Labor Group and its Place in the Political System of Russia
(1906 – 1917)
Authors: Protasova O. L. , Bikbaeva E. V.
Published: December 2021

The main elements of the ideological platform and the main stages of activity are shown, as well as the political fate of the Labor Group (1906 – 1917). The analysis of the general position of the Labor group in the party system of the country is given. The main political allies, which the Trudoviks gave preference to at different periods of the existence of their organization, were identified. It is noted that, although the Trudoviks, within the framework of parliamentary activities, collaborated with both liberals and socialists, while keeping their own line outside of ideologies, ultimately their accession in 1917 to the People's Socialist Party, which is closest to the Trudoviks in terms of views on ways of solving the agrarian question seems to be quite natural. It is concluded that the emergence of the Labor Group – originally a truly peasant organization – on the political arena of Russia in 1906-1907 reflected noticeable modernization changes in the socio-political life of the country, marked the beginning of the development of a democratic culture in it.
People’s Socialists in the Interim Government (1917)
Authors: Protasova O. L. , Pirozhkova I. G.
Published: December 2021

The paper considers the activity of representatives of the Labor People’s Socialist Party in the institutions of state power in Russia in the spring and autumn of 1917, primarily in the Provisional Government. The main directions of the work of the People’s Socialists within the Ministries of Food and Justice are characterized. The attitude of Labor People’s Socialist Party members to revolutionary changes in the country, interaction with colleagues – like-minded people and rivals is highlighted; attention is drawn to some aspects of interpersonal relationships of participants in the revolutionary events of 1917, which previously remained in the shadows. A general description of the initiatives of People's Socialists at key state posts is given, the reasons for their successes and failures in the context of the socio-economic and political situation of that time are revealed. It is shown that from a professional point of view, the activity of Labor People’s Socialist Party representatives in the executive branch deserves mainly a positive assessment, as it was characterized by energy, responsibility, competence and dedication.
Software to Control the Temperature Mode of Operation
of the Reactor for Thermo-Oxidizing Destruction of Periodic Polymers
Authors: Popov A. P. , Tikhomirov S. G. , Neizvestny O. G. , Obraztsov N. K.
Published: December 2021

The architecture of the software for an automated system
for controlling the temperature regime of the reactor for thermo-oxidative destruction
of polymers is presented. A description of the functional capabilities of a set
of developed software modules is given, with the help of which a method of predictive (proactive) control of a technological process is implemented on the basis of a set of simulation models of physicochemical stages of the process.
Identification of the Measuring Situation when Determining Thermal Properties of Solid Materials under Uncertainty
Authors: Selivanova Z. M. , Skomorokhov K. V.
Published: December 2021

The main factors characterizing the uncertainty of the measuring situation during thermophysical measurements are considered. An approach is proposed for determining the parameters of the thermophysical properties of materials and
the measurement error under uncertainty. A conceptual model of the formation
of a measuring environment for an intelligent information-measuring system
of thermophysical properties of materials in a situation of uncertainty has been created. The solution of the optimization problem of identification of the measuring situation when determining the thermophysical properties of solid materials of various ranges
of thermal conductivity is presented. An information model has been developed
to identify a measurement situation in an intelligent information and measurement system operating under conditions of uncertainty.
Raising Efficiency of Voltage Converter
and Power Control of Microgrid Network Power Equipment
Authors: Shauki I. , Kalinin V. F. , Ussama B. , Leshelakh A.
Published: December 2021

The paper considers a method for increasing the efficiency of energy conversion using a voltage source converter (VSC) in a microgrid network and issues
of power control of power equipment at the present stage of technology development. Modeling of various energy systems using this method has been carried out.
Estimation of Energy Costs when Processing High-Paraffinic Oil
in Rotary Impulse Apparatus
Authors: Promtov M. A. , Kutukov S. E. , Koliukh A. N. , Zverev F. S.
Published: December 2021

The regularities of changes in energy consumption to reduce the viscosity of highly paraffinic oil during processing in an installation based on a rotary impulse apparatus (RIA) are experimentally investigated. The decrease in oil viscosity during processing in RIA exceeds 40%. An increase in the amount of oil supply to the RIA makes it possible to reduce the specific energy consumption for its processing
at the same relative value of the decrease in viscosity. Specific energy consumption decreases with an increase in oil consumption through the RIA according to
the dependence close to the logarithmetic one.
Optimization of Cyclic Adsorption Processes
and Gas Mixture Separation Plants
Authors: Akulinin E. I. , Dvoretsky D. S. , Dvoretsky S. I.
Published: December 2021

The analysis of the cyclic adsorption process and the installation
of separation of gas mixtures by the method of pressure swing adsorption as an object
of optimization have been carried out. The study found operating (control) variables (the duration of the adsorption stage, the pressure at the compressor outlet,
the coefficient of reverse flow for the regeneration of the adsorbent, the program
of changes in the opening time of the inlet and outlet valves of the installation); undefined parameters (composition, temperature and pressure of the initial gas-air mixture); output variables of the installation (concentration of oxygen, nitrogen in
the product gas flow, the productivity of the installation, the degree of extraction
and reduced costs for the production of oxygen with a given purity of 40 - 90 and
higher vol.%). A one-stage problem of optimization of the regimes of a stationary periodic process of adsorption separation of atmospheric air and oxygen concentration was formulated and solved by the method of short-cycle adsorption under conditions
of partial uncertainty of the initial information in the presence of restrictions on the purity of the product gas, the productivity of the installation and the rate of gas flow
in the “frontal layer” of the adsorbent. An iterative algorithm for its solution
is proposed.
Comparative Assessment of Chlorophyll and Carotenoids Content
in the Leaves of Medicinal Dandelion (Taraxacum Officinale)
and Silver Birch (Betula Pendula Roth) in Tambov (2010 - 2021)
Authors: Vervekina N. V. , Gladysheva I. V. , Shubina A. G.
Published: December 2021

To assess the changes in the environment in Tambov, using bioindication methods, the pigments of the photosynthetic apparatus of the leaves of the medicinal dandelion (Taraxacum Officinale) and silver birch (Betula Pendula Roth) were studied. It is shown that the anthropogenic load
on the environment in the city of Tambov has increased over the past decade.
Acid-Basic Activation of Carbon-Containing
Sorption Material and Its Application for Extraction
of Methylene Blue Dye from Aquatic Media
Authors: Starostina I. V. , Polovneva D. O. , Makridina Yu. L. , Loktionova E. V.
Published: December 2021

The results of the use of thermally modified kieselguhr sludge from the production of vegetable oils (TKSH500) of the initial and activated with a 30 % solution of nitric acid (TKSH500k) and 1M sodium hydroxide solution (TKSH500sh) for purification of model solutions from the dye methylene blue (MB) are presented. The maximum activating effect was achieved as a result of acid treatment, which leads to a 38 % increase in the total acidity of the sorption material in comparison with the initial one. It is shown that the sorption isotherms of the dye on the initial and activated samples of TKSH500 have an S-shaped form. In the region of low dye concentrations, a monolayer is formed; with an increase in the dye content, sorption becomes polymolecular. Analysis of the IR spectra of sorption materials after adsorption of the MB dye showed a shift to the low-frequency region of the positions of the bands in the regions corresponding to the vibrations of the O–H and C = O bonds, which indicates the ionization of hydroxyl and carboxyl groups present in the sorption materials, and the formation of a bond between them and the MB molecule.
Features of Ultrafiltration Purification of Waste Water
from Sodium Lauryl Sulphate
Authors: Khorokhorina I. V. , Lazarev S. I. , Filimonova O. S. , Orlov A. A. , Mikhailin M. I.
Published: December 2021

A study of the process of ultrafiltration separation of
a solution containing an anionic surfactant on membranes of different types: cellulose acetate and polysulfonamide was carried out. It was found that the material of the active layer of the composite membrane has
a significant effect on the ultrafiltration separation of such solutions. High values of the retention coefficient during ultrafiltration separation
of solutions containing anionic surfactants were obtained in dilute solutions.