bluuebunny/crossref_metadata_2025 huggingface dataset:
Burial History, Hydrocarbon Generation, and Migration in the Upper Paleogene Petroleum System of the Offshore North Sumatra Basin: Insights from 1D and 2D Basin Modeling.
Authors: Lazuardi H.
Published: December 2021

One-dimensional and two-dimensional basin modeling can be used to infer the burial history, hydrocarbon generation, and migration of hydrocarbon. In this paper, the study focuses on 1D and 2D basin modeling in North Sumatera Offshore as one of the prolific deep-water basins in Indonesia. The data consists of 5 exploration wells and 2D seismic data that are vitrinite reflectance, rock-eval data, and bottom-hole temperature. Well data’s have been used to calibrate heat flow and thermal evolution of the basin, while 2D seismic data have been used to support the basin modeling. Based on the result, the basin formed by the collision of the Australian Plate with the Eurasian Plate evolved due to block faulting that caused a pull-apart basin. In the Early Oligocene, changes in the movement of the Indian plate also changed tectonics from subduction to strike-slip fault resulting in Andaman Sea rifting. The southern part of the research area was affected by the Andaman Sea rifting, which caused unconformities in the Middle Miocene. The main generating source rock is the Bampo, Belumai, and Baong Formation, which is predominantly consist of Type III kerogen (gas prone) in the north and Type II/III (mix oil and gas prone) in the South. The timing of petroleum generation may have occurred is in the Early Pliocene. The Early oil generation which occurred simultaneously with the seal rock and may have been migrated to the Middle and Late Miocene reservoir through the faults as a vertical migration pathway. The results of this study allow us to improve the hydrocarbon prospect and reduce exploration risks.
The Mobile Woman: Getting Around during the 1630 Plague in Bologna
Authors: Massong Natalie
Published: December 2021

Legal proclamations show that during the 1630 plague outbreak in Bologna, Italy, women were required to remain quarantined in their homes for the duration of the epidemic while men remained mobile. However, primary texts and visual sources demonstrate that despite these legal restrictions, women remained active players in the fight against the plague by circumventing regulations. Significantly, women played a key role in sustaining the Bolognese economy, in particular by travelling to work in the silk industry. Moreover, while male doctors enjoyed special dispensations to avoid visiting the sick directly, female nurses left their homes to care for the daily needs of patients in the lazzaretto, the plague hospital.
Artworks and primary texts depict a mobile woman. They show women from the poorest of backgrounds who were compelled to move through the city’s public spaces, remaining active in the street life of the plagued city. For instance, along with unlicensed women healers and nuns, prostitutes commonly volunteered for service in the plague hospitals. This required a brief shift in the social status of these women as they moved from their brothels to the pestilent walls of the lazzaretto. This paper will address the contribution that these resilient women made to maintaining the family economy and the significant positions women held in administering care, which have been overlooked in the scholarship. It will argue that by performing these essential activities, Bolognese women enjoyed an increase in physical but also social mobility, albeit short-lived.
Heat Stress Affects Seed Set and Grain Quality of Vietnamese Rice Cultivars during Heading and Grain Filling Period
Authors: Thuy Tran Loc , Thach Tran Ngoc , Xa Tran Thi Thanh , Nha Chau Thanh , My Vo Thi Tra , Nguyen Nguyen Thi Thao , V Nguyen Thuy Kieu
Published: December 2021

Environmental stress trigger a variety of rice plant response, ranging from alters seed set, grain yield and grain quality during flowering and grain filling stage.  Efforts are required to improve our understanding of the impact of heat stress on rice production, which are essential strategies in rice cultivation. This article investigated the seed set, yield components and grain yield of Vietnamese rice cultivars (Indica germplasm) under high temperature environment during the flowering and grain filling stage. Six rice cultivars, including popular cultivars and new cultivars of Cuu Long Delta Rice Research Institute, and one popular extraneous cultivar with differences in maturing time, were grown in pots at high temperature (HT) and natural temperature condition as control (CT). All rice cultivars were subjected to the high temperature starting from the heading stage to the harvest maturity, applied by greenhouse effect. The greenhouse has about 25 cm window opening on 3 sides for air ventilation. The seed set rate of the heat-sensitive rice genotypes decreased significantly under HT, leading to a significant reduction in grain yield. The lowest seed set was recorded in “OM4900” (44.3%) and “OM18” (39.9%) under high temperature environment. The lower yield in all rice cultivars at an elevated temperature resulted in a dramatic decrease of filled grains and contributed to a loss of 1000-grain weight. ‘“OM892” is a potential rice cultivar for heat tolerant breeding program due to the seed set percentage was above 80% in both HT and CT conditions. High temperature during the grain filling stage resulted in a decreased amylose and increased chalkiness for all OM cultivars.
Water Requirement Estimation of One-Whorl Rubber (Hevea brasiliensis Müll. Arg.) Planting Materials
Authors: Cahyo Andi Nur
Published: December 2021

Fulfilling water requirement is one of the important factors for a successful production of rubber tree planting materials. Research on the irrigation requirement for young rubber trees is crucial to determine the amount of water required for an optimum plant growth. The aim of this study was to determine the amount of water needed by one whorl rubber planting material to compensate the amount of evapotranspiration, as well as to estimate the crop coefficient value (kc). The research was conducted at the Indonesian Rubber Research Institute on July 2021. Daily evapotranspiration (ETc) of rubber planting materials of clone “PB 260”, “RRIC 100”, and “IRR 112” planted in polybag size 13 cm x 35 cm were measured by weighing the planting materials daily. Evapotranspiration for the reference crop was collected from the Indonesian Rubber Research Institute climatological station. Our study showed that the amount of water required by each rubber planting material was 92.21 mL per day per polybag when the mean of daily reference evapotranspiration (ETo) was 3.67 mm per day. Therefore, the crop coefficient (kc) of one whorl rubber planting material arranged sparsely was ± 0.32. This kc value can be used as a base to calculate water requirement of one whorl rubber planting material based on the daily reference evapotranspiration (ETo).
Pengaruh Pelatihan Fire Safety Management Terhadap Motivasi K3 Perawat RSUP Dr. Wahidin Sudirohusodo
Authors: H Hasbullah , Wahyu Atjo , Awaluddin Awaluddin
Published: December 2021

Motivasi adalah proses mempengaruhi atau mendorong dari luar terhadap seseorang atau kelompok kerja agar mereka mau melaksanakan sesuatu yang telah ditetapkan. Penelitian ini bertujuan untuk mengetahui hubungan pelatihan fire safety management dengan motivasi keselamatan dan kesehatan kerja pada perawat di RSUP Dr. Wahidin Sudirohusodo Makassar. Peneliti menggunakan metode eksperimen dengan pendekatan pre test dan post test one group. Pada desain ini observasi dilakukan sebanyak 2 kali yaitu sebelum eksperimen dan sesudah eksperimen. Pengumpulan data dilakukan pada Oktober-November 2018 terhadap 40 perawat diruang rawat inap sebagai sampel dari 1803 populasi yang diambil dengan teknik purposive sampling. Data didapatkan dengan pre test sebelum pelatihan dan post test sesudah pelatihan dengan kuesioner. Analisis data dilakukan menggunakan uji Mc Nemar. Penelitian ini menunjukkan angka 0,031 dimana nilainya di bawah nilai p=0,05 maka Ho ditolak sehingga dapat disimpulkan bahwa terdapat perbedaan atau pengaruh secara signifikan antara tindakan sebelum (pre test) dan sesudah (post test) pelaksanaan pelatihan fire safety management pada tenaga perawat di RSUP Dr. Wahidin Sudirohusodo. Diharapkan pihak rumah sakit untuk selalu melaksanakan pelatihan rutin mengenai fire safety management agar motivasi keselamatan dan kesehatan kerja bertambah pada perawat.
Faktor yang Berhubungan dengan Stres Kerja pada Perawat di Rumah Sakit Umum Daerah Sayang Rakyat Makassar
Authors: Ardiyany Ilyas Lisdha , Rahim Muhammad Rum , Awaluddin Awaluddin
Published: December 2021

The development of the world of work is greatly improved with various types of occupational professions, ranging from light work to work that drains the mind and also energy in addition, workers from any profession must have felt fatigue when they carry out work, and it can trigger work stress on someone who arises from several factors in the workplace so that the quality of their work is not productive. The study aims to determine the relationship between age, workload, mental demands, social support for work stress in nurses at RSUD Sayang Rakyat Makassar. The cross sectional study was conducted. The research will be conducted at RSUD Sayang Rakyat Makassar in February until March 2020. The population in this study is all nurses of RSUD Sayang Rakyat Makassar totaling 99 people. Analysis of the data used univariate and bivariate analysis. The results showed that as many as 15.2% experienced work stress and those without work stress were 84.8%. There is no relationship between age and value (p=0.421). There is no relationship between workload (p=0,000) and social support (p=0.001), mental demands (p=0,000) have a relationship with nurses at RSUD Sayang Rakyat Makassar. This research suggests evaluating nurses work descriptions and effective communication routinely every briefing before work. It is expected that activities outside of work such as recreation or in the form of entertainment.
Non-Suicidal Self-Injury in the Decompensation of Personality Disorder in Adolescents During the COVID-19 Pandemic in 2020–2021
Authors: Krylova E. S. , Kuleshov A. A. , Beburishvili A. A. , Kaleda V. G.
Published: December 2021

The aim of the study was to determine the clinical and psychopathological characteristics of non-suicidal self-injury (NSSI) in personality disorder (PD) in the comparative age-related aspect during the coronavirus infection (COVID-19) pandemic. Patients and methods: a total of 230 patients (177 males and 53 females) aged 16–25, diagnosed with PD and NSSI behavior manifestations, were studied retrospectively in mental hospital and outpatintly by using clinical-psychopathological method. All patients were divided into two equal groups of 115 people each. Group I was examined in 2017–2019, Group II — in 2020–2021 during the coronavirus infection (COVID-19) pandemic. Results: common features established in both groups were as follows: affective instability, alexithymia, conflict relations with significant others, and current traumatic experience. For a comparative assessment of NSSI in patients of both groups, we used the NSSI typology in adolescent PD, previously developed by the authors. Impulsive, demonstrative, addictive, depersonalizing and self-destructive types of NSSI were recognized as significant for the diagnostic assessment. In the second group of patients, that is, during the period of the COVID-19 pandemic, a change in the selected variants of NSSI was found, that is, in borderline and narcissistic PD the impulsive type was replaced by a demonstrative type, and in schizoid and anxious PD it turned into an addictive one. For a comparative assessment of NSSI in patients of both groups, we used the NSSI typology in PD in adolescence, previously developed by the authors. When assessing suicidality in group II, it was revealed that in most types of PD, with a decrease in the number of suicidal attempts, there was a noticeable increase in the incidence of NSSI with demonstrative suicidality, which correlated with the trajectories of the identified variants of NSSI. Conclusions: the study underlined the role of personality pathology in in adolescence in the development of psychopathological disorders with NSSI and their high association with suicidal activity. The modification of various NSSI variants in the context of a coronavirus infection (COVID-19) pandemic may be due to the unique characteristics of the psychotraumatic factor. With the same strength of impact, the multidirectional influence on various personality types and comorbid psychopathological disorders in adolescence should be taken into account, when creating new models of therapeutic and socio-rehabilitation interventions for the adolescent contingent of patients.
DIGITAL GEOREFERENCED ARCHIVES: ANALYSIS AND MAPPING OF RESIDENTIAL CONSTRUCTION IN BOLOGNA IN THE SECOND HALF OF THE TWENTIETH CENTURY
Authors:   Anna Chiara Benedetti, Carlo Costantino, Riccardo Gulli
Published: December 2021

The study is aimed to provide a detailed knowledge database of the housing sector in the period of real estate significant expansion in Bologna in the second half of the 20th century. The final objective is the definition of a digital archive that is accessible and searchable and also a tool for analyses before interventions. The first phase of this research has focused on consulting cartographies and archival documents. On the one hand, analyzing maps and aerial photos of Bologna has identified the urban sprawl in the reference period 1940-1970. On the other hand, the cataloguing from new building permits provides some relevant data about architectural and construction features of the housing sector in the same period. The data resulting from archival research are implemented with a municipal georeferenced database using GIS software. In this way, a direct link is created between building specificities, urban fabric, and localization, so that the shifting from the urban scale to the building one is always possible. Then, another purpose is the definition of an algorithm to identify a sample of residential lots suitable for replacement within the urban perimeter of the city up to 1970. An evaluation method is currently ongoing to assess the convenience of this intervention category, rather than restoration, and to define a protocol to support the decision-making process together with a management system in three areas (technical, social, and economic) respecting circularity.
AN ECO-SUSTAINABLE PARAMETRIC DESIGN PROCESS OF BIO-BASED POLYMERS TEMPORARY STRUCTURES
Authors:   Cecilia Mazzoli, Davide Prati, Marta Bonci
Published: December 2021

The primary common goal of any resource processing intervention is environmental sustainability. It seeks practical collaboration in construction technology and innovation, whether intentionally used to increase eco-friendly energy savings or implicitly used to reduce the impact of construction projects on the global environment. Biopolymers are a promising field for growth because they combine high technological potential with environmental sustainability. A viable alternative to conventional, costly, and complicated construction systems is the employment of technologies that exploit environmental sustainability concepts to create temporary modular structures that maximize manufacturing times and costs.
The paper presents an innovative process for designing temporary structures for social, cultural, and exhibition use. The present paper aims at the following objectives: (i) to illustrate a parametric approach to the design of spaces for such proposes; (ii) to study a prefabricated construction system consisting of interlocking elements to be dry assembled; (iii) to propose the use of new bio-based material. The building system originated based on these research instances targets the requirements of: adaptability, flexibility, and reversibility of spaces; prefabrication, lightness, and speed of installation and assembly; environmental sustainability and recyclability of components employed. In particular, the modules that make up the final product, characterized by vaults, are conceived as small shelters for reading and social activities.
Association Among Self-Injury, Suicidal Tendency, and Personality and Psychological Characteristics in Korean Adolescents
Authors: Yang Kyojin , Kim Si Young , Kim Hyejin , Hwang Jun-Won
Published: December 2021

Objective To compare mental health problems and personality characteristics between adolescents with self-injury (SI) and suicidal tendency (ST), including suicidal ideation and suicide planning.Methods The participants completed the Adolescent Personality and Mental Health Problems Screening Questionnaire, Third version (AMPQ-III), and Korean version of the Strengths and Difficulties Questionnaire (SDQ-Kr), and gave their demographic information. Based on the answered SI and ST items in AMPQ-III, the participants were divided into groups: without SI and ST, with SI and without ST, without SI and with ST, and with SI and ST. Analysis of variance (ANOVA) and post-hoc Scheffe test were used to determine group differences, stepwise multiple linear regression, and factors associated with SI and ST.Results ANOVA yielded results for all categories of mental health problems. Significant differences were observed between the four groups. Conversely, for personality characteristics, only the sense of community item between the group without SI and with ST and the group without SI and ST were significantly different; sense of community was associated with ST (β=-0.054, p=0.005). Among the mental health subscales, SI was significantly associated with conduct problems (β=0.211, p<0.001), emotional problems (β=0.173, p<0.001), peer problems (β=0.085, p<0.001), and prosocial behavior (β=0.073, p<0.001). ST was significantly associated with emotional symptoms (β=0.317, p<0.001), peer problems (β=0.130, p<0.001), conduct problems (β=0.106, p<0.001), hyperactivity (β=0.050, p=0.010), and prosocial behavior (β=0.062, p<0.001).Conclusion The findings highlight the necessity of assessing psychological strength, difficulties, and personality characteristics for the prevention and early intervention of adolescent SI.
Aggression as a Significant Factor in the Formation and Expression of the Self
Authors: Gihon Anat
Published: December 2021

Aggression, in the broad sense of the term, is examined from psychoanalytic literature with a focus on Bioenergetic theory and treatment. Clinical material enhances the exploration of working with aggression in patients, including energetic work with breath, grounding, boundary setting and expressive movements. This paper explores dealing with aggression when working with weaker structures, while working from a relational matrix and when encountering issues of countertransference.
El horizonte matemático en el conocimiento para la enseñanza del profesor: geometría y medida en educación primaria

Authors: De Gamboa Genaro , Badillo Edelmira , Ribeiro Miguel
Published: December 2021

La construcción de un conocimiento matemático con comprensión por parte del alumno requiere del profesor un conocimiento que permita conectar conocimientos previos y futuros de los alumnos, creando puentes entre ambos. En este artículo nos enfocamos en el horizonte matemático como componente del conocimiento del profesor, aportando una interpretación de ese conocimiento con base en tres niveles que se construyen a partir del análisis de tareas relacionadas con la práctica docente. En ejemplos de situaciones de aula de educación primaria relacionadas con tareas de geometría y medida, se presentan y discuten indicadores con el objetivo de describir y analizar cómo un conocimiento del horizonte matemático permite enriquecer la práctica de aula. Mathematical horizon in teachers’ knowledge for teaching: geometry and measurement; elementary educationPromoting the elaboration of students’ mathematical knowledge and understanding requires teachers’ having a knowledge allowing connecting students’ prior and future knowledge building bridges between those two spaces. In this paper we focus on aspects of the mathematical horizon as one of teachers’ knowledge dimensions, presenting an interpretation of such knowledge, with a practice-based approach, grounded in the analysis of three levels of teachers’ practices. Using examples from tasks in geometry and measurement in elementary school practices, some indicators are presented and discussed with the aim of describing and analyzing how a teachers’ horizon knowledge allows enriching teaching practices.Handle: http://hdl.handle.net/10481/37188WOS-ESCI
Cooperación, juego y matemáticas: análisis de la aplicación del Tridio Cooperativo con alumnado de primaria

Authors: Ribosa Jesús , Durán David
Published: December 2021

Esta investigación trata sobre la aplicación en aulas de primaria del juego de mesa llamado Tridio Cooperativo. Los objetivos son: (a) analizar las dinámicas de interacción, (b) valorar el nivel de cooperación, (c) analizar episodios de razonamiento matemático y (d) conocer la percepción del alumnado sobre el aprendizaje cooperativo. A partir de una metodología cualitativa, los resultados muestran que el Tridio Cooperativo fomenta la interacción entre todos los jugadores, ofrece un marco potencial (pero no garantizado) de trabajo cooperativo, promueve numerosos tipos de razonamiento matemático y hace reflexionar al alumnado sobre el trabajo cooperativo. Cooperation, Games and Mathematics: Analysis of the Application of Cooperative Tridio with Students of Primary Education This research is about the application of the board game called Cooperative Tridio in primary education classes. The goals are: (a) to analyse the interaction dynamics, (b) to assess the cooperation level, (c) to analyse the episodes of mathematical reasoning, and (d) to know the students’ perception concerning the cooperative learning. By using a qualitative research methodology, results showed that Cooperative Tridio promotes interaction between all the players, offers a potential (but not guaranteed) cooperative learning framework, fosters many types of mathematical reasoning, and makes students reflect on cooperative learning. Handle: http://hdl.handle.net/10481/45500WOS-ESCI
Estudio comparativo de la estimación de cantidades continuas que hacen los estudiantes de secundaria y futuros maestros

Authors: Castillo-Mateo Jesús , Segovia Isidoro , Molina Marta
Published: December 2021

Presentamos un estudio en el que se analizan los resultados y los procesos empleados en tareas de estimación de cantidades continuas de longitud, superficie, capacidad y masa, por estudiantes de tercero de Educación Secundaria Obligatoria (ESO) y estudiantes universitarios del Grado de Educación Primaria. Los resultados ponen de manifiesto que no hay diferencias entre ambos grupos de sujetos. Los participantes son buenos estimadores en el caso de las magnitudes longitud y superficie pero subestiman en capacidad y masa. No se detectan grandes diferencias en los procesos y estrategias empleados, salvo un uso mayor y más efectivo del empleo de fórmulas por los futuros maestros.Comparative Study of Secondary Students and Prospective Primary Teachers´ Estimation Skills of Continuous QuantitiesIn this paper we analyze the results and processes used by third-year secondary students and prospective elementary teachers in estimation tasks of continuous quantities of length, surface, capacity and mass. The results show no differences between both groups of students. Both are good estimators of length and surface but underestimate capacity and mass. No big differences are detected in the processes and strategies used, except a higher and more effective use of formulas in the case of prospective teachers.Handle: http://hdl.handle.net/10481/48174WOS-ESCIScopus record and citations
Registros numéricos en un campo de cultivo. Escrituras en ambiente de tensión y conflicto laboral
Authors: Solares Diana
Published: December 2021

En este artículo se analizan las técnicas de registro numérico utilizadas por trabajadores de campos agrícolas en México. Se identifica que esas técnicas están determinadas por aspectos como: los propósitos de la actividad agrícola específica, los intereses y la jerarquía laboral de quienes participan en ella. Los conocimientos matemáticos implicados en el desarrollo de la actividad también están influenciados por esos aspectos. Para esta investigación se adopta una postura teórica que dialoga con diversas perspectivas, particularmente con la Teoría Antropológica de lo Didáctico y los Nuevos Estudios de Literacidad. Numerical Records in an Agricultural Field. Writings in Tension and Labor Conflict EnvironmentsAgricultural workers number registration techniques are analyzed. These techniques are determined by a set of diverse aspects, such as the purposes of the specific agricultural activity and the interests and hierarchies of those who work in the activity. These aspects have also main influence on the mathematical knowledge involved in the development of the activity. The theoretical perspective adopted on this study looks for a dialog between diverse perspectives, particularly with the Theory the Anthropological Theory of Didactics and the New Literacy Studies. Handle: http://hdl.handle.net/10481/53008doi:10.30827/pna.v12i4.7850Scopus record and citations
Fases del razonamiento inductivo que presentan profesores de matemáticas al resolver un problema de generalización
Authors: Sosa Moguel Landy Elena , Aparicio Landa Eddie , Cabañas-Sánchez Guadalupe
Published: December 2021

Se reportan seis fases del razonamiento inductivo que presentaron 19 profesores de matemáticas de secundaria al resolver un problema de generalización de un patrón cuadrático. Los datos se recolectaron mediante sus respuestas escritas y entrevistas. El análisis se realizó con base en el modelo de Cañadas y Castro (2007). Se encontró que, para generalizar de manera correcta, no basta con reconocer las regularidades en varios casos particulares, sino que se precisa de asociar esas regularidades con estructuras matemáticas que describan el patrón de manera general, y se detectaron dificultades en algunas fases que impidieron a los profesores llegar a generalizar.Inductive reasoning stages presented by mathematics teachers when solving a generalization problemThis investigation reports six inductive reasoning stages presented by nineteen middle school mathematics teachers when solving a generalization problem of a quadratic pattern. The data was collected through their written responses and interviews. The analysis was performed based on the model of Cañadas and Castro (2007). It was found that the correct generalization not only needed the recognition of regularities in some particular cases, but an accurate association between those regularities and the mathematical structures that describe the pattern in a general way. Furthermore, several difficulties that prevented the teachers from achieving a generalization were detected.Doi: 10.30827/pna.v14i2.9118
El Proceso de generalización y la generalización en acto. Un estudio de casos
Authors: Ayala-Altamirano Cristina , Molina Marta
Published: December 2021

A partir de un análisis microgenético del proceso de generalización de tres estudiantes de cuarto de primaria, se describe cómo construyen, dan sentido y expresan una relación funcional en un contexto de resolución de problemas. Los resultados contribuyen a la comprensión y reflexión sobre la integración del enfoque funcional en las aulas de primaria. Se distinguen diferentes grados de sofisticación en el proceso de generalización según los medios semióticos empleados. Uno de los estudiantes expresa de forma explícita la generalización mientras que en los otros dos casos queda implícita en las acciones de los estudiantes sugiriendo una incipiente conciencia sobre lo indeterminado o presencia de la analiticidad.
La comprensión de las funciones exponencial y logarítmica: una mirada desde las Conexiones Matemáticas y el Enfoque Ontosemiótico.
Authors: Campo-Meneses Karen Gisel , García-García Javier
Published: December 2021

Se propone y se valora un marco de referencia para estudiar la comprensión a partir del establecimiento de conexiones matemáticas y algunos constructos del Enfoque Ontosemiótico. Para ello, se tomó el caso de 10 estudiantes mexicanos de bachillerato cuando resolvían tareas sobre las funciones exponencial y logarítmica. Se empleó la Entrevista Basada en Tareas para colectar los datos, los cuales fueron analizados utilizando el análisis temático y el análisis ontosemiótico. Como resultado se obtuvo que, de acuerdo con el establecimiento de la conexión de reversibilidad (conexión matemática central), se puede valorar el nivel de comprensión de los estudiantes respecto a las funciones objeto de estudio.
Geometría fuera de vista: clasificando cuadriláteros con estudiantes con discapacidad visual.
Authors: Gonzalez Salazar Lisset D. , Flores-Medrano Erick
Published: December 2021

Esta investigación presenta los efectos que tiene, sobre las clasificaciones de cuadriláteros que realizan estudiantes con discapacidad visual, una serie de actividades acompañadas de un material manipulativo. Se trata de un estudio de corte cualitativo, mediante estudio de caso, con la participación de cuatro estudiantes con ceguera total de entre 10 y 12 años. En esta experiencia evidenciamos que los estudiantes ciegos desarrollan un proceso equivalente al proceso de visualización haciendo manipulaciones de representaciones 3D de cuadriláteros y, mediante procesos de abstracción, construyen definiciones al identificar las características de los objetos y realizan clasificaciones particionales.
Developing purposeful mathematical thinking: a curious tale of apple trees

Authors: Ainley Janet
Published: December 2021

In this paper I explore aspects of the ways in which school mathematics relates to the “real” world, and argue that this relationship is an uneasy one. Through exploring the causes of this unease, I aim to expose some problems in the ways in which context is used within mathematics education, and argue that the use of context does not ensure that the purposes of mathematics are made transparent. I present and discuss a framework for task design that adopts a different perspective on mathematical understanding, and on purposeful mathematical thinking. Desarrollo de un pensamiento matemático intencionado: un relato curioso de manzanos En este artículo exploro aspectos de las maneras en que las matemáticas escolares se relacionan con el mundo “real” y argumento que esta relación es preocupante. Al explorar las causas de esta preocupación, me propongo exponer algunos problemas que surgen de las formas en que se usa el contexto en Educación Matemática y argumento que el uso del contexto no asegura la transparencia de los propósitos de las matemáticas. Presento y discuto un esquema para el diseño de tareas que adopta una perspectiva diferente sobre la comprensión de las matemáticas y el pensamiento matemático intencionado.Handle: http://hdl.handle.net/10481/19524
Discussing a teacher MKT and its role on teacher practice when exploring data analysis

Authors: Ribeiro C. Miguel , Carrillo José
Published: December 2021

This article considers teacher knowledge in managing mathematically critical situations and the role of what can be termed a mathematical summary in the analysis of a teaching episode, viewed from the perspective of Mathematical Knowledge for Teaching (MKT). The analysis is based on an episode of content review, from a perspective which aims to understand the teacher’s logic rather than merely identify gaps in their knowledge. We discuss the importance of approaching mathematically critical situations in order to contribute to eradicating mathematical innumeracy (statistics) and to promote a kind of practice which is "mathematically demanding" as well as "pedagogically exciting". Discusión del conocimiento matemático para la enseñanza de un profesor y su papel en la práctica docente cuando se explora el análisis de datosEste artículo considera el conocimiento del profesor al gestionar situaciones matemáticamente críticas y el papel de lo que puede denominarse un resumen matemático en el análisis de un episodio de enseñanza, visto desde la perspectiva del conocimiento matemático para la enseñanza. El análisis se basa en un episodio de revisión del contenido, desde una perspectiva que trata de comprender la lógica del profesor en vez de simplemente identificar lagunas en su conocimiento. Discutimos la importancia de abordar las situaciones matemáticamente críticas con el fin de contribuir a erradicar la incompetencia en matemáticas (estadística) y promover un tipo de práctica que sea "matemáticamente exigente" así como "pedagógicamente interesante".Handle: http://hdl.handle.net/10481/ 19520
Missing value and comparison problems: What pupils know before the teaching of proportion

Authors: Silvestre Ana Isabel , Da Ponte João Pedro
Published: December 2021

This paper analyses grade 6 pupils’ mathematical processes and difficulties in solving proportion problems before the formal teaching of this topic. Using a qualitative methodology, we examine pupils’ thinking processes at four levels of performance in missing value and comparison problems. The results show that pupils tend to use scalar composition and decomposition strategies in missing value problems and functional strategies in comparison problems. Pupils’ difficulties are related to a lack of recognition of the multiplicative nature of proportion relationships. Problemas de valor ausente y de comparación: qué saben los alumnos antes de la enseñanza de la proporciónEn este trabajo se analizan los procesos matemáticos y las dificultades en la resolución de problemas de proporción de alumnos de sexto grado antes de la enseñanza formal de este tema. Usando métodos cualitativos, se examinan los procesos de pensamiento de los alumnos, en cuatro niveles de desempeño, en problemas de valor ausente y comparación. Los resultados muestran la tendencia de los alumnos a usar una composición escalar y estrategias de descomposición en los problemas de valor ausente, y estrategias funcionales en los problemas de comparación. Las dificultades de los alumnos se relacionan con la falta de reconocimiento de la naturaleza multiplicativa de las relaciones proporcionales.Handle: http://hdl.handle.net/ 10481/19500Nº de citas en SCOPUS (2017): 2 (Citas de 2º orden, 1)
Auditing the numeracy demands of the middle years curriculum

Authors: Goos Merrilyn , Geiger Vince , Dole Shelley
Published: December 2021

The National Numeracy Review Report recognized that numeracy development requires an across the curriculum commitment. To explore the nature of this commitment we conducted a numeracy audit of the South Australian Middle Years curriculum, using a numeracy model that incorporates mathematical knowledge, dispositions, tools, contexts, and a critical orientation. All learning areas in the published curriculum were found to have distinctive numeracy demands. The audit should encourage teachers to promote numeracy in even richer ways in the curriculum they enact with students. Inspección de las demandas de la alfabetización matemática en el currículo de la educación secundaria obligatoria El National Numeracy Review Report reconoció que el desarrollo de la alfabetización matemática requiere un compromiso a través del currículo. Para explorar la naturaleza de este compromiso realizamos una inspección de la alfabetización matemática en el currículum de los últimos años de la educación primeria y los primeros de la educación secundaria en el sur de Australia. Utilizamos un modelo de alfabetización matemática que incorpora conocimiento matemático, disposiciones, herramientas, contextos y una orientación crítica. Encontramos que todas las áreas de aprendizaje en el currículo oficial presentan exigencias específicas de alfabetización matemática. Estos resultados deberían animar a los profesores a promover la alfabetización matemática de manera cada vez más rica en el currículo que implementan con los estudiantes.Handle: http://hdl.handle.net/10481/20051Nº de citas en WOS (2017): 3 (Citas de 2º orden, 5)Nº de citas en SCOPUS (2017): 3 (Citas de 2º orden, 13)
Designing professional learning tasks for mathematics learning trajectories

Authors: Wilson P. Holt , Sztajn Paola , Edgington Cyndi
Published: December 2021

In this paper, we present an emerging set of learning conjectures and design principles to be used in the development of professional learning tasks that support elementary teachers’ learning of mathematics learning trajectories. We outline our theoretical perspective on teacher knowledge of learning trajectories, review the literature concerning mathematics professional learning tasks, offer a set of initial conjectures about teacher learning of learning trajectories, and articulate a set of principles to guide the design of tasks. We conclude with an example of one learning trajectory professional learning task taken from our current research project.Diseño de tareas de aprendizaje profesional para trayectorias de aprendizaje de matemáticasEn este artículo, presentamos un conjunto emergente de conjeturas de aprendizaje y de principios de diseño para ser empleados en el desarrollo de tareas de aprendizaje profesional que apoyan el aprendizaje de trayectorias de aprendizaje de matemáticas de maestros de primaria. Describimos brevemente nuestra perspectiva teórica sobre el conocimiento del profesor acerca de trayectorias de aprendizaje; revisamos la literatura sobre tareas de aprendizaje profesional, presentamos un conjunto de conjeturas iniciales acerca del aprendizaje del profesor sobre trayectorias de aprendizaje; y articulamos un conjunto de principios para guiar el diseño de tareas. Concluimos con un ejemplo de una tarea de aprendizaje profesional que ha sido tomada de nuestro proyecto de investigación actual.Handle: http://hdl.handle.net/10481/24791Nº de citas en WOS (2017): 3 (Citas de 2º orden, 2)Nº de citas en SCOPUS (2017): 3 (Citas de 2º orden, 1)
Actitudes de estudiantes de ingeniería de nuevo ingreso hacia el uso de la tecnología en matemáticas

Authors: López Rubí , Castro Enrique , Molina Marta
Published: December 2021

Actitudes de estudiantes de ingeniería de nuevo ingreso hacia el uso de la tecnología en matemáticasEste trabajo describe tendencias detectadas en las actitudes de estudiantes de ingeniería de nuevo ingreso hacia el uso de la tecnología en la enseñanza y aprendizaje de las matemáticas, mediante opiniones emitidas en un cuestionario sobre actitudes diseñado para tal efecto. Se describe el proceso seguido para establecer categorías para las actitudes hacia el uso de tecnología puestas de manifiesto por los estudiantes en sus respuestas. Los resultados indican una tendencia de actitudes positivas.Undergraduate engineering students’ attitudes towards using technology in mathematicsThis paper describes trends detected in first year engineering students’ attitudes towards the use of technology in teaching and learning mathematics through opinions gathered in a survey about attitudes designed for this purpose. We describe the process followed to establish categories for the attitudes towards the use of technology evidenced by the students in their answers. The results indicate a trend of positive attitudes.Handle: http://hdl.handle.net/10481/27878
Un análisis de la capacidad espacial en estudios de ingeniería técnica

Authors: Arrieta Iera , Medrano María Concepción
Published: December 2021

Desde el siglo pasado se ha recalcado la importancia que tiene la capacidad espacial en la in-teligencia y en la enseñanza-aprendizaje de las Matemáticas. En este trabajo se ha elegido el modelo de Carroll para analizar la capacidad espacial del alumnado de la Escuela Politécnica Universitaria de San Sebastián. Se han planteado tres objetivos: (a) analizar la capacidad es-pacial de los estudiantes de primero en función de la especialidad y del sexo, y en relación con la nota obtenida en dibujo técnico; (b) analizar, igualmente, la capacidad espacial de los estudiantes de tercero; y (c) comparar ambos resultados.An analysis of spatial ability in technical engineering studiesSince the last century, the importance of spatial ability has been emphasized in regards to intelligence and the teaching and learning of mathematics. In this work we have chosen the Carroll model to analyze the spatial ability of students in the Polytechnic University School of San Sebastián. We have proposed three objectives: to analyze the spatial ability of students of first course based on specialty and sex, and in relation to the grade obtained in technical drawing; to analyze, in a similar manner, the spatial ability of students of third course; and compare both results.Handle: http://hdl.handle.net/10481/34156WOS-ESCI
Perbaikan kadar trigliserida dan Hs-CRP pada tikus Wistar Diabetes Mellitus tipe 2 dengan biskuit biji bunga matahari
Authors: Amanda Efina , Juniarto Achmad Zulfa , Afifah Diana Nur , Muniroh Muflihatul , Al-Baarri Ahmad Ni'matullah , Fitranti Deny Yudi
Published: December 2021

Diabetes Mellitus is a group of metabolic diseases characterized by hyperglycemia due to defects in insulin secretion or insulin action. Increased glucose allows free fatty acids to enter as raw material for forming triglycerides. Hs-CRP can be used to identify the most sensitive inflammatory markers in diabetes. This study aims to analyze the effect of sunflower seed biscuits on triglyceride levels and Hs-CRP in Wistar rats with type 2 diabetes mellitus. The method is a true experiment with a randomized pre-post test with a control group design. The research sample size was 24 male Wistar rats, divided into four control groups K(-), K(+), and treatment P1, P2. The intervention was carried out for 28 days, and triglycerides were measured by spectrophotometer, and Hs-CRP was measured using the ELISA method. Statistical analysis used three tests, namely the Paired T-Test, the Kruskal Wallis test, and the Spearman correlation test. There are differences after the intervention and changes between groups with triglyceride values before intervention 145 mg/dl and after intervention 145 mg/dl and Hs-CRP values before intervention 14.8 mg/l and after intervention 14,8 mg/l. Changes between groups of triglyceride and Hs-CRP levels after statistical tests (p= 0,000) and (p= 0,000), respectively. The conclusion is a provision of sunflower seed biscuits showed an effect on triglyceride and Hs-CRP levels of type 2 diabetes mellitus rats. The lowest decrease in triglyceride and Hs-CRP levels was found in the treated rats with a dose of 1440 mg / 200 g of rats
Prerequisites for developing an advanced welding technology for repair of worn elements of steam-conducting systems
Authors: Syrenko Tatyana
Published: December 2021

The main disadvantage of standard technologies of welding steam pipelines of thermal power plants is that they can allow the presence of defective structures close to the defective ones in the metal of the seam and in the sections of the HAZ. In this regard, the question arises about the development of a new technology that will provide the appropriate structure and properties that will increase the service life of steam pipelines and get a significant economic effect. Goal. The goal is improvement of the technology of welding pipelines of thermal power plants based on the study of the features of the formation of welded joints operating in Creep conditions. Methodology. The level of wear of the elements of the Steam-conducting path was estimated taking into account the provisions of the regulatory documentation of metallographic analysis, determination of chemical composition and properties, as well as the degree of their deformation. Results. It is revealed that welded joints are characterized by initial structural heterogeneity, which is closely related to long-term strength, ductility and impact strength. For example, at different sections of a welded joint, there is a different intensity of transition of alloying elements and, accordingly, a different type of structural component can be formed. The proposed technology of welding repair of damaged elements of steam pipelines using mechanized welding in CO2+Ar provides for the production of welded joints with a higher level of uniformity of structure, chemical composition and properties. Scientific novelty and practical significance. The welding technology has been improved, which includes developing the modes for performing repair work by mechanized welding in an Ar + CO2 environment of steam pipeline samples with a depth of ≥ 20 mm and a width of ≥ 30 mm, and differs from the known ones by using linear energy welding of 1.2–1.5 MJ/m.
Quality assessment of AL-C-B coatings on steel surfaces obtained by electro spark alloying
Authors: Gaponova Oksana , Myslyvchenko Oleksandr , Dudchenko Vitalina
Published: December 2021

Problem. As a rule, during the operation of the product, the surface layers of materials are most affected. These can be parts that work in aggressive environments, at high temperatures, various force actions, the presence of abrasive particles, etc. Under such conditions, different types of steels and alloys are used, and, most commonly, it is high-alloy, which significantly complicates the manufacturing process and increases the cost of the finished product. Diffusion coating methods are the most widespread in the industry, which is due to the best study and ease of these processes. However, there are alternative methods of surface treatment, which are devoid of the disadvantages of diffusion methods.

The goal is to develop a method of obtaining boron-containing coatings of the Al-C-B system by the electro spark alloying (ESA), applying STS to the treated surface, to study the processes of structural and phase formation of surface layers depending on the energy processes of ESA and substrate material. Methology. Samples made of steel 20 and 40 were used for the study, on which a coating consisting of their sulfur ointment, aluminum powder, amorphous boron powder was applied. Without waiting for drying, the ESA surfaces of the samples were carried out with a graphite electrode on an installation with a discharge energy of 0.13, 0.55 and 4.9 J. The surface roughness after treatment was determined on a profilograph-profilometer by removing and processing profilograms. Metallographic analysis of coatings was performed using an MIM-7optical microscope, and durometric studies were made on the PMT-3 device according to standard methods. Results: the article presents the original method for obtaining boron-containing coatings of the Al-C-B system by the ESA method, which involves applying a coating consisting of sulfur ointment, aluminum powder, amorphous boron powder on the treated surface, followed by electric spark doping with a graphite electrode.