bluuebunny/crossref_metadata_2025 huggingface dataset:
De infancia invisible a infancia-s visibles
Authors: Calle Martha Ligia
Published: December 2019

Este texto nace como parte de un ejercicio de reflexión, en torno a la condición infantil desarrollado a partir del proceso de formación en el seminario sobre Infancias, juventudes y educación, y producto de la tesis Las contravenciones y las infracciones escolares: Un análisis del hurto y robo como expresiones de la violencia escolar, desarrollada en el Doctorado Interinstitucional de Educación de la Universidad Distrital Francisco José de Caldas. Busca mostrar algunos elementos para poder visibilizar la infancia, teniendo en cuenta la experiencia educativa, a partir de tres conceptos: el primero referido a la escuela como institución que garantiza los derechos, siendo el fundamental la educación; el segundo, con referencia a la visibilización del cuerpo; y el tercero, relacionado con la necesidad de una contracultura frente a modelos que impiden la formación de la subjetividad y promueven el consumo y las ideologías hegemónicas.
Cómo propiciar en los estudiantes una lectura inferencial
Authors: Lizarazú Bernal Betty Concepción
Published: December 2019

Pocas veces la enseñanza de la lectura resulta eficiente frente al favorecimiento de la capacidad inferencial en los estudiantes, es decir, a la habilidad de elaborar hipótesis de sentido que certifiquen un proceso que asegure la comprensión tras la explicitación de elementos latentes en la estructura interna de los textos; más bien, se observa con frecuencia que los estudiantes leen de manera espontánea e inocente en un ambiente pedagógico donde los docentes mismos no se presentan como modelo de un lector avezado. En el presente artículo, se muestran los avances de una investigación, la cual se ha valido de métodos cualitativos de las ciencias sociales, tales como la investigación acción participativa, hermenéutica, etnográfico y el análisis de documentos. A partir de la aplicación metodológica es que hemos podido constatar estas dificultades lectoras en la población estudiantil. Frente a este panorama, Eco (1999), Aparici (1998) y  Rodríguez (2006), entre otros autores, trazan caminos que coadyuvan a la enseñanza de la lectura con sentido. Ahora bien, a partir de lo anterior, resulta viable plantear y desarrollar una propuesta que contribuya a la cualificación de habilidades inferenciales y abductivas, desde otra mirada que facilite los procesos de comprensión lectora en un grupo de estudiantes que inician su secundaria, utilizando como pretexto el uso de formatos visuales, de manera más concreta la historieta o cómic.
Veinte años de erradicación del trabajo infantil en Colombia
Authors: Jaramillo Mantilla María Del Pilar
Published: December 2019

En este artículo se hace una revisión de las políticas formuladas y ejecutadas desde mediados de la década de 1990 para la erradicación del trabajo infantil en Colombia; señala sus relativos logros e impactos y su progresiva cualificación. A pesar de la reducción significativa del número de niños, niñas y adolescentes que trabajan, el problema sigue siendo muy grande. El examen de las estadísticas nacionales del DANE para los años de 2012 a 2016 evidencia tanto los logros como las limitaciones de la acción institucional. Para concluir, se sugieren posibles explicaciones a la persistencia y gravedad del problema del trabajo infantil.
Escritura creativa en la escuela
Authors: Guzmán Ayala Bárbara Yaneth , Bermúdez Cotrina Jennifer Paola
Published: December 2019

Este artículo tiene como objetivo examinar el devenir de la pedagogía de la escritura en la escuela, para orientarse luego hacia la enseñanza de la escritura de invención como proceso creativo asociado con textos estéticos mediante los cuales cierto perfil de estudiantes se convierte en productor cultural, de­jando de lado su papel pasivo. Para esto, nos am­paramos en un entendimiento semio-lingüístico del acto escritor (Barthes, 2002; Eco, 1999; Coto, 2006) y, a través del diseño de investigación acción en el aula, detallamos cómo esta práctica explorada faci­lita el reconocimiento individual de un estudiante de la escuela rural Mancilla, quien presentó su his­toria de vida a través de la escritura creativa. La de­tección de este tipo de casos destacados dentro de los resultados de la investigación permite valorar las estrategias auténticas de recreación simbólica de la realidad subjetiva, mostrando los avances logrados con intervenciones que permiten desarrollar proce­sos escritores en estudiantes.
Inteligencias múltiples y rendimiento académico del área de matemáticas en estudiantes de educación básica primaria
Authors: Hernández Suárez César Augusto , Prada Núñez Raúl , Rincón Álvarez Gerson Adriano
Published: December 2019

El objetivo de este trabajo fue determinar el grado de asociación existente entre los tipos de inteligencias y el rendimiento académico de los estudiantes en el área de matemáticas. Para ello, se conformó una muestra intencional de 539 estudiantes de educación básica primaria de cuatro instituciones educativas públicas de la ciudad de Cúcuta, Colombia. El instrumento elegido fue el cuestionario de detección de inteligencias múltiples de McKenzie (1999), el cual fue aplicado colectivamente en el aula. Además, se obtuvieron las calificaciones de los tres primeros periodos académicos en el área de matemáticas de los mismos estudiantes. Estos datos se sometieron a análisis estadístico descriptivo univariante y de correlaciones con estadísticos no paramétricos. Los resultados obtenidos destacan la relación significativa existente entre el grado de inteligencia lógico-matemática y el rendimiento académico en matemáticas, lo que corrobora los hallazgos de estudios latinoamericanos previos y los fundamentos del modelo de Gardner.
La literatura y los niños. Cuatro escolios imprescindibles
Authors: Robledo Botero Beatriz Helena
Published: December 2019

En los más de 30 años que llevo recorriendo el mundo de la literatura infantil y su relación con los niños he hechos algunos hallazgos que quiero compartir con ustedes, no como verdades, sino como una invitación a reflexionar. Los iré presentando como escolios de un texto interior que se ha ido fraguando con los años a partir de lecturas, investigaciones y experiencias. La invitación es que sigan pensando esa relación vital que existe entre los niños y los libros, ya sea desde su interior o acompañados, glosando, conversando.
Comunicación intercultural en la escuela urbana: una propuesta formativa en y para la diferencia
Authors: Muñoz Barriga Andrea
Published: December 2019

Este artículo da cuenta de los resultados de la tesis doctoral denominada “Comunicación en aulas diversas urbanas en Bogotá: una mirada desde la interculturalidad”, cuyos principales objetivos se enfocan en comprender cómo se configuran en la actualidad los procesos de comunicación entre maestros y estudiantes, y en realizar una propuesta como recurso pedagógico de atención a la diversidad en la formación básica primaria del área de lenguaje para la infancia diversa del contexto escolar urbano. Se desarrolló una investigación con enfoque etnográfico en tres aulas con grupos de 40 niños y niñas, algunos de ellos indígenas, afrodescendientes y en condición de desplazamiento. El análisis de la comunicación en estos espacios permitió establecer modelos comunicativos y de enseñanza, a manera de macroestructuras, que representan los intercambios entre maestras y estudiantes en el área de español y determinar una serie de implicaciones pedagógicas hacia una formación en y para la diferencia.
Conocimiento de la didáctica del inglés en docentes de educación preescolar
Authors: Jaramillo Valencia Bairon , Quintero Sonia Ruth , Ramírez Libia Elena
Published: December 2019

Este artículo presenta la importancia que tiene el conocimiento teórico-práctico para la enseñanza del inglés como lengua extranjera. Se definen algunos conceptos concernientes al quehacer docente, retomando autores clásicos y contemporáneos para una mejor comprensión. Consecuentemente, se exponen resultados de encuestas y una serie de testimonios provenientes de la aplicación de una entrevista semiestructurada y sesiones de grupos focales a las unidades de análisis que hicieron parte de una investigación que se denominó “Formación pedagógica de los profesionales en educación inicial y su relación con la didáctica en un contexto internacional”. Con base en el análisis de los resultados ligados a una de las categorías de esta investigación, se menciona una serie de teorías sobre el aprendizaje y enfoques sobre enseñanza de la lengua inglesa de forma general, las cuales pueden servir de guía para las docentes de educación preescolar que deseen mejorar su práctica educativa, puntualmente, en relación con el inglés.
Adolescentes, escritura y TIC
Authors: Garzón Bohórquez Aida Patricia
Published: December 2019

La presente investigación se enmarca en el análisis de los rasgos del chat que lo pueden posicionar como género emergente. Se emplea el estudio de caso con una población de estudiantes de ciclo tres de una institución distrital en la red social Facebook. El chat que estos preadolescentes usan posee particularidades tanto de la oralidad como de la escritura que lo hacen un discurso singular, pues se trata de una comunicación escrita significativa y creativa que puede favorecer el desarrollo de habilidades verbales. Ya que la red se constituye en un soporte virtual de aprendizaje que es autónomo, pues es empleado en entornos extraclase, donde los jóvenes aprenden solos, porque este formato posibilita nuevas formas de leer y escribir, mediante la creación y recreación del lenguaje que usan a diario. Para esto nos apoyamos en los siguientes teóricos: Cassany, Noblia, Bajtín, Calsamiglia, Vilà, Mayans, Yus y Farías, entre otros.
Redes familiares y vecinales para el cuidado de niños y niñas
Authors: Gómez Santa Gloria Mercedes , Agudelo Bedoya Maria Eugenia
Published: December 2019

Se parte de la pregunta por identificar el uso de las redes familiares y vecinales en el cuidado de niños y niñas menores de 12 años, a través de un estudio cualitativo en el que se entrevistan 70 cuidadoras y cuidadores de familias en la ciudad de Medellín. Como fundamentos teóricos se acude a los conceptos de cuidado, redes familiares y redes vecinales. Los principales hallazgos muestran el uso preponderante de las redes familiares a diferencia del poco uso de las redes vecinales para el cuidado de niños y niñas, concluyendo que, en este grupo poblacional consultado, las familias son soporte en el cumplimiento de las funciones del cuidado basado en vínculos de solidaridad y apoyo mutuo. Con respecto a las redes vecinales hay una marcada desconfianza hacia los vecinos para delegar funciones de esta naturaleza, lo cual obedece a inestabilidad en los lugares de residencia que dificulta la generación de redes.
Polyaniline Modified Natural Zeolite as Adsorbent for Chromium(III) Metal Ion
Authors: Nurianingsih Rina , Sriatun Sriatun , Darmawan Adi
Published: December 2019

Zeolite is an inorganic material whose surface has a permanent negative charge in its crystal structure. This material consists of tetrahedral [SiO4]-4 and [AlO4]-5, which are connected by oxygen atoms in such a way as to form an open three-dimensional framework containing canals and cavities, as well as alkali or alkali metals for balancing the negative charge. This structure makes zeolites have the ability to adsorb. The ability of natural zeolite adsorption can improve by modifying the surface by adding polyaniline cationic compounds (PANI), which have an amine group (: NH2). Moreover, environmental pollution by metals is the biggest problem in daily life, one of which is the metal ion Cr(III), which is a waste from industrial processes. Therefore, it is necessary to have an effort to reduce waste. This study aims to determine the effect of the addition of polyaniline on the adsorption ability of natural zeolites to metal ions Cr(III). The research was carried out in several stages, namely activation of natural zeolite using HF 1%, modification with polymer from aniline monomers, and ammonium peroxidisulphate (APS), and testing the ability of adsorption on Cr(III) metal ions. The study on the ability to adsorb Cr(III) metal ions by PANI-modified zeolites was carried out on variations in the concentration of Cr(III) metal ions and the system pH. The results showed that natural zeolite successfully modified with PANI. The FTIR absorption band at wavenumber 1303 -1319 cm-1 and 1597 cm-1 indicated the presence of NH functional groups. Meanwhile, adsorption capability test data showed that the best adsorbent for adsorption of Cr(III) metal ions was zeolite-PANI 0.01M. The best pH was 4, the initial concentration of Cr(III) metal ions was 1000 ppm, and the percentage of absorption is 48.13%.
Study of Equilibrium and Kinetics of Pb(II) in Solution Using Persimmon Tannin Gel as an Adsorbent
Authors: Azis Thamrin , Ahmad La Ode , Rosa Fajrin E. , Kadir Laode Abdul
Published: December 2019

Heavy metals concentrations exceeding the recommended threshold are hazardous for the environment, so there is a need for handling it safely. The purpose of this research was to determine the adsorption capacity and kinetics of adsorption. This research uses an adsorption method in the process of removing Pb(II) heavy metal ions using persimmon tannin gel. Besides the influence of contact time, pH, and the concentration of Pb(II) metal ions on adsorption, a kinetics study was also carried out. The adsorption rate is obtained through the adsorption rate constant (K) and the reaction order generated from the kinetics model. Based on the results of the research, showed the optimum adsorption process, which is 20 minutes and at a pH of 5. The maximum adsorption capacity of 17.62 mg/g with the value of the standard energy changes of Gibbs adsorption (-ΔG° = -14.274 kJ/moll) indicates that the adsorption takes place through physical interaction. The kinetic adsorption gives the adsorption rates a constant of, k = 0.008231 g/mg.min.
Sekundärregelung und Koordination verkoppelter Microgrids
Authors: Hermann Jonathan , Hammer Bernhard , Konigorski Ulrich
Published: December 2019

Der vorliegende Beitrag behandelt die hierarchische Regelung von Microgrids mit leistungselektronischer Einspeisung sowie die Verkopplung solcher Microgrids zu Verbundnetzen. Zur Regelung einzelner Microgrids wird eine Sekundärregelung vorgeschlagen, die auf einer Lastschätzung und einem Ausgangsregulierungsansatz basiert. Sie erzielt stationäre Genauigkeit in Frequenz und Leistungsaufteilung. Um den Verbund von auf diese Weise sekundärgeregelten Microgrids zu koordinieren, wird schließlich ein konsensusbasierter Ansatz zur Tertiärregelung präsentiert.
Surrogate models in bidirectional optimization of coupled microgrids
Authors: Baumann Manuel , Grundel Sara , Sauerteig Philipp , Worthmann Karl
Published: December 2019

The energy transition entails a rapid uptake of renewable energy sources. Besides physical changes within the grid infrastructure, energy storage devices and their smart operation are key measures to master the resulting challenges like, e. g., a highly fluctuating power generation. For the latter, optimization based control has demonstrated its potential on a microgrid level. However, if a network of coupled microgrids is considered, iterative optimization schemes including several communication rounds are typically used. Here, we propose to replace the optimization on the microgrid level by using surrogate models either derived from radial basis functions or neural networks to avoid this iterative procedure. We prove well-posedness of our approach and demonstrate its efficiency by numerical simulations based on real data provided by an Australian grid operator.
The use of faecal immunochemical testing in the decision-making process for the endoscopic investigation of iron deficiency anaemia
Authors: Rodriguez-Alonso Lorena , Rodriguez-Moranta Francisco , Ruiz-Cerulla Alexandra , Arajol Claudia , Serra Katja , Gilabert Pau , Ibañez-Sanz Gemma , Camps Blau , Guardiola Jordi
Published: December 2019

Background

Blood loss from the gastrointestinal (GI) tract is the most common cause of iron deficiency anaemia (IDA) in adult men and postmenopausal women. Gastroduodenal endoscopy (GDE) and colonoscopy are frequently recommended, despite uncertainty regarding the coexistence of lesions in the upper and lower GI tract. The faecal immunochemical test (FIT) measures the concentration of faecal haemoglobin (f-Hb) originating only from the colon or rectum. We aimed to assess whether the FIT was able to select the best endoscopic procedure for detecting the cause of IDA.

Methods

A prospective study of 120 men and postmenopausal women referred for a diagnostic study of IDA were evaluated with an FIT, GDE and colonoscopy. The endoscopic finding of a significant upper lesion (SUL) or a significant bowel lesion (SBL) was considered to be the cause of the IDA.

Results

The diagnoses were 35.0% SUL and 20.0% SBL, including 13.3% GI cancer. In the multivariate analysis, the concentration of blood haemoglobin (b-Hb) <9 g/dL (OR: 2.60; 95% CI 1.13–6.00; p = 0.025) and non-steroidal anti-inflammatory drugs NSAIDs (2.56; 1.13–5.88; p = 0.024) were associated with an SUL. Age (0.93; 0.88–0.99; p = 0.042) and f-Hb ≥ 15 μg Hb/g faeces (38.53; 8.60–172.50; p < 0.001) were associated with an SBL. A “FIT plus gastroscopy” strategy, in which colonoscopy is performed only when f-Hb ≥15 μg Hb/g faeces, would be able to detect 92.4% of lesions and be 100% accurate in the detection of cancer while avoiding 71.6% of colonoscopies.

Conclusions

The FIT is an accurate method for selecting the best endoscopy study for the evaluation of IDA. An FIT-based strategy is more cost-effective than the current bidirectional endoscopy-based strategy and could improve endoscopic resource allocation.
Causal Mediation Analysis in the Presence of a Misclassified Binary Exposure
Authors: Jiang Zhichao , VanderWeele Tyler
Published: December 2019

Mediation analysis is popular in examining the extent to which the effect of an exposure on an outcome is through an intermediate variable. When the exposure is subject to misclassification, the effects estimated can be severely biased. In this paper, when the mediator is binary, we first study the bias on traditional direct and indirect effect estimates in the presence of conditional non-differential misclassification of a binary exposure. We show that in the absence of interaction, the misclassification of the exposure will bias the direct effect towards the null but can bias the indirect effect in either direction. We then develop an EM algorithm approach to correcting for the misclassification, and conduct simulation studies to assess the performance of the correction approach. Finally, we apply the approach to National Center for Health Statistics birth certificate data to study the effect of smoking status on the preterm birth mediated through pre-eclampsia.
The crystal structure of [(tetra-μ
2-2,6-difluorobenzoato-κ
2
O:O′)-bis-(2,6-difluorobenzoato-κ
2
O:O′)-bis-(1,10-phenanthroline-κ
2
N:N′)]dierbium(III) C66H34N4O12F12Er2
Authors: Yu-Fei Zhong , Wen-Min Wang , Xiong-Xin Peng , Guang-Ming Bao , Chun-Yan Hu , Hou-Qun Yuan
Published: December 2019

C66H34N4O12F12Er2, triclinic, P1̄ (no. 2), a = 11.8934(5) Å, b = 12.0041(4) Å, c = 12.4578(5) Å, α = 68.718(4)°, β = 64.205(4)°, γ = 87.053(3)°, V = 1480.09(12) Å3, Z = 1, R
gt(F) = 0.0326, wR
ref(F
2) = 0.0626, T = 293(2) K.
Surgery for Patients with Radiation-Induced Constrictive Pericarditis
Authors: Wei Shixiong , Zhang Lin , Cui Huimin , Li Lianggang , Ren Tong , Jiang Shengli
Published: December 2019

Radiation-induced heart disease (RIHD) is a major side effect of chest radiation therapy (RT). Most changes of pericardium will occur within a few weeks after receiving chest RT, while most of them will take decades or more to become constrictive pericarditis. Pericardiectomy is an effective treatment method. Here, we report 2 cases of radiation pericarditis after chest RT at our center.
Accelerated Evolution of Limb-Related Gene Hoxd11 in the Common Ancestor of Cetaceans and Ruminants (Cetruminantia)
Authors: Li Jun , Shang Songyang , Fang Na , Zhu Yubo , Zhang Junpeng , Irwin David M , Zhang Shuyi , Wang Zhe
Published: December 2019

Reduced numbers of carpal and tarsal bones (wrist and ankle joints) are extensively observed in the clade of Cetacea and Ruminantia (Cetruminantia). Homebox D11 (Hoxd11) is one of the important genes required for limb development in mammals. Mutations in Hoxd11 can lead to defects in particular bones of limbs, including carpus and tarsus. To test whether evolutionary changes in Hoxd11 underlie the loss of these bones in Cetruminantia, we sequenced and analyzed Hoxd11 coding sequences and compared them with other 5′ HoxA and HoxD genes in a taxonomic coverage of Cetacea, Ruminantia and other mammalian relatives. Statistical tests on the Hoxd11 sequences found an accelerated evolution in the common ancestor of cetaceans and ruminants, which coincided with the reduction of carpal and tarsal bones in this clade. Five amino acid substitutions (G222S, G227A, G229S, A240T and G261V) and one amino acid deletion (G254Del) occurred in this lineage. In contrast, other 5′ HoxA and HoxD genes do not show this same evolutionary pattern, but instead display a highly conserved pattern of evolution in this lineage. Accelerated evolution of Hoxd11, but not other 5′ HoxA and HoxD genes, is probably related to the reduction of the carpal and tarsal bones in Cetruminantia. Moreover, we found two amino acid substitutions (G110S and D223N) in Hoxd11 that are unique to the lineage of Cetacea, which coincided with hindlimb loss in the common ancestor of cetaceans. Our results give molecular evidence of Hoxd11 adaptive evolution in cetaceans and ruminants, which could be correlated with limb morphological adaptation.
Long-Read Genome Sequence of the Sugar Beet Rhizosphere Mycoparasite Pythium oligandrum
Authors: Faure Charlène , Veyssière Marine , Boëlle Betty , San Clemente Hélène , Bouchez Olivier , Lopez-Roques Céline , Chaubet Adeline , Martinez Yves , Bezouška Karel , Suchánek Martin , Gaulin Elodie , Rey Thomas , Dumas Bernard
Published: December 2019

Pythium oligandrum is a soil born free living oomycete able to parasitize fungi and oomycetes prey, including important plant and animals pathogens. Pythium oligandrum can colonize endophytically the root tissues of diverse plants where it induces plant defenses. Here we report the first long-read genome sequencing of a P. oligandrum strain sequenced by PacBio technology. Sequencing of genomic DNA loaded onto six SMRT cells permitted the acquisition of 913,728 total reads resulting in 112X genome coverage. The assembly and polishing of the genome sequence yielded180 contigs (N50 = 1.3 Mb; L50 = 12). The size of the genome assembly is 41.9 Mb with a longest contig of 2.7 Mb and 15,007 predicted protein-coding genes among which 95.25% were supported by RNAseq data, thus constituting a new Pythium genome reference. This data will facilitate genomic comparisons of Pythium species that are commensal, beneficial or pathogenic on plant, or parasitic on fungi and oomycete to identify key genetic determinants underpinning their diverse lifestyles. In addition comparison with plant pathogenic or zoopathogenic species will illuminate genomic adaptations for pathogenesis toward widely diverse hosts.
Biology of the Caenorhabditis elegans Germline Stem Cell System
Authors: Albert Hubbard E Jane , Schedl Tim
Published: December 2019

Stem cell systems regulate tissue development and maintenance. The germline stem cell system is essential for animal reproduction, controlling both the timing and number of progeny through its influence on gamete production. In this review, we first draw general comparisons to stem cell systems in other organisms, and then present our current understanding of the germline stem cell system in Caenorhabditis elegans. In contrast to stereotypic somatic development and cell number stasis of adult somatic cells in C. elegans, the germline stem cell system has a variable division pattern, and the system differs between larval development, early adult peak reproduction and age-related decline. We discuss the cell and developmental biology of the stem cell system and the Notch regulated genetic network that controls the key decision between the stem cell fate and meiotic development, as it occurs under optimal laboratory conditions in adult and larval stages. We then discuss alterations of the stem cell system in response to environmental perturbations and aging. A recurring distinction is between processes that control stem cell fate and those that control cell cycle regulation. C. elegans is a powerful model for understanding germline stem cells and stem cell biology.
Drosophila Embryonic CNS Development: Neurogenesis, Gliogenesis, Cell Fate, and Differentiation
Authors: Crews Stephen T
Published: December 2019

The Drosophila embryonic central nervous system (CNS) is a complex organ consisting of ∼15,000 neurons and glia that is generated in ∼1 day of development. For the past 40 years, Drosophila developmental neuroscientists have described each step of CNS development in precise molecular genetic detail. This has led to an understanding of how an intricate nervous system emerges from a single cell. These studies have also provided important, new concepts in developmental biology, and provided an essential model for understanding similar processes in other organisms. In this article, the key genes that guide Drosophila CNS development and how they function is reviewed. Features of CNS development covered in this review are neurogenesis, gliogenesis, cell fate specification, and differentiation.
Non-clinical performance and acceptability of a small portable respiratory stimulator device for basic neonatal resuscitation
Authors: Delgado Carlos A. , Sánchez Víctor M. , Velásquez Pablo M. , Shimabuku Roberto L. , Huicho Luis
Published: December 2019

Introduction: Neonatal resuscitation demands equipment for respiratory support not always available in rural areas. Innovative devices are required, and rapid prototyping allows to generate them using three-dimensional (3D) designs and printers. Objective: To evaluate the non-clinical performance and the acceptability by health personnel of a neonatal respiratory device produced by rapid prototyping. Methods: Observational study, descriptive, of proof of concept developed in two steps. Step 1: Manufacture of the device with rapid prototyping in three-dimensional (3D) scanners and printers. Step 2: Demonstration of the invention during training programs in neonatal resuscitation for health personnel in three regions of Peru (Tarapoto, Huánuco and Ayacucho). In both steps, we evaluated the performance of the device connected to a gas flow analyser. A survey was administered to the health workers of Tarapoto and Ayacucho to know their acceptability. Results: The developed prototype is T-shaped with two side bellows that, when pressed with one hand, project air through the centre towards a facial adapter. The use of the prototype in the laboratory generated an average air flow of 4.8 Lt /min (SD ± 1.7) and an average pressure of 5.9 cmH2O (SD ± 1.4). This device was considered to be “very simple to use” in an acceptability survey involving 39 nurses and 11 doctors in remote areas of the capital of Peru. Conclusions: The evaluated prototype is acceptable by the staff and has a performance capable of generating spontaneous breathing at birth.
Consumption of Private Goods as Substitutes for Environmental Goods in an Economic Growth Model
Authors: Antoci A. , Galeotti M. , Russu P.
Published: December 2019

We analyze growth dynamics in an economy where a private good can be consumed as a substitute for a free access environmental good. In this context we show that environmental deterioration may be an engine of economic growth. To protect themselves against environmental deterioration, economic agents are forced to increase their labour supply to increase the production and consumption of the private good. This, in turn, further depletes the environmental good, leading economic agents to further increase their labour supply and private consumption and so on. This substitution process may give rise to self-enforcing growth dynamics characterized by a lack of correlation between capital accumulation and private consumption levels, on one side, and economic agents’ welfare, on the other.

Furthermore, we show that agents’ self-protection consumption choices can generate indeterminacy; that is, they can give rise to the existence of a continuum of (Nash) equilibrium orbits leading to the same attracting fixed point or periodic orbit.
Numerical Analysis of the Age-Sex-Structured Population Dynamics Taking into Account Spatial Diffusion
Authors: Repšys Š. , Skakauskas V.
Published: December 2019

We present results of the numerical investigation of the homogenous Dirichlet and Neumann problems to an age-sex-structured population dynamics deterministic model taking into account random mating, female’s pregnancy, and spatial diffusion. We prove the existence of separable solutions to the non-dispersing population model and, by using the numerical experiment, corroborate their local stability.
Dufour and Soret Effects on Mixed Convection Flow Past a Vertical Porous Flat Plate with Variable Suction
Authors: Alam M. S. , Rahman M. M.
Published: December 2019

In this paper the Dufour and Soret effects on mixed convection flow past a vertical porous flat plate embedded in a porous medium have been studied numerically. The governing non-linear partial differential equations have been transformed by a similarity transformation into a system of ordinary differential equations, which are solved numerically by applying NachtsheimSwigert shooting iteration technique together with sixth order Runge-Kutta integration scheme. For fluids of medium molecular weight (H2, air), profiles of the dimensionless velocity, temperature and concentration distributions are shown graphically for various values of suction parameter fw, Dufour number Du and Soret number Sr. Finally, numerical values of physical quantities, such as the local skin-friction coefficient, the local Nusselt number and the local Sherwood number are presented in tabular form.
Sensitivity Analysis of Fatigue Behaviour of Steel Structure under In-Plane Bending
Authors: Kala Z.
Published: December 2019

The aim of the present paper is to analyse the influence of some input quantities on the fatigue resistance of a steel structure. The steel element subjected to many times repeated in-plane bending moment was analysed. The fatigue resistance was defined as the number of cycles causing the initial crack size propagation up to the critical size. The variability influence of input random quantities on the fatigue resistance variability was studied by means of the stochastic sensitivity analysis. All input imperfections were considered to be random quantities. The Latin Hypercube Sampling (LHS) numerical simulation method (Monte Carlo type method) was used. It has been found by the stochastic sensitivity analysis that the fatigue resistance variability is most sensitive to the initial crack variability. The paper presented draws attention to the necessity of identifying the statistical characteristics of the initial crack size as exactly as possible because their random variability can largely influence the failure probability of a structure. Large diversity in applying the statistical characteristics of initial crack size by numerous specialists is illustrated by the list of international publications at the end of the present paper.
Sturm-Liouville Problem for Stationary Differential Operator with Nonlocal Two-Point Boundary Conditions
Authors: Pečiulytė S. , Štikonas A.
Published: December 2019

The Sturm-Liouville problem with various types of two-point boundary conditions is considered in this paper. In the first part of the paper, we investigate the Sturm-Liouville problem in three cases of nonlocal two-point boundary conditions. We prove general properties of the eigenfunctions and eigenvalues for such a problem in the complex case. In the second part, we investigate the case of real eigenvalues. It is analyzed how the spectrum of these problems depends on the boundary condition parameters. Qualitative behavior of all eigenvalues subject to the nonlocal boundary condition parameters is described.
Dufour and Soret Effects on Unsteady MHD Free Convection and Mass Transfer Flow past a Vertical Porous Plate in a Porous Medium
Authors: Alam M. S. , Rahman M. M. , Samad M. A.
Published: December 2019

The Dufour and Soret effects on unsteady MHD free convection and mass transfer flow past an infinite vertical porous plate embedded in a porous medium have been studied numerically. The non-linear partial differential equations, governing the problem under consideration, have been transformed by a similarity transformation into a system of ordinary differential equations, which is solved numerically by applying Nachtsheim-Swigert shooting iteration technique together with sixth order Runge-Kutta integration scheme. The effects of various parameters entering into the problem have been examined on the flow field for a hydrogen-air mixture as a non-chemical reacting fluid pair. Finally, the numerical values of local Nusselt number and local Sherwood number are also presented in tabular form.
Control of Vibrations due to Moving Loads on Suspension Bridges
Authors: Zribi M. , Almutairi N. B. , Abdel-Rohman M.
Published: December 2019

The flexibility and low damping of the long span suspended cables in suspension bridges makes them prone to vibrations due to wind and moving loads which affect the dynamic responses of the suspended cables and the bridge deck. This paper investigates the control of vibrations of a suspension bridge due to a vertical load moving on the bridge deck with a constant speed. A vertical cable between the bridge deck and the suspended cables is used to install a hydraulic actuator able to generate an active control force on the bridge deck. Two control schemes are proposed to generate the control force needed to reduce the vertical vibrations in the suspended cables and in the bridge deck. The proposed controllers, whose design is based on Lyapunov theory, guarantee the asymptotic stability of the system. The MATLAB software is used to simulate the performance of the controlled system. The simulation results indicate that the proposed controllers work well. In addition, the performance of the system with the proposed controllers is compared to the performance of the system controlled with a velocity feedback controller.
Theoretical Modeling and Optimization of the Detection Performance: a New Concept for Electrochemical Detection of Proteins in Microfluidic Channels
Authors: Amatore C. , Oleinick A. , Svir I. , Da Mota N. , Thouin L.
Published: December 2019

In this work, we present a complete theoretical analysis of a new concept of electrochemical detector for application in proteomics upon considering two band microelectrodes performing in generator-collector mode. This concept of an original electrochemical detector is aimed at the detection of proteins following their separation in microfluidic biochips. The theoretical analysis is based on the use of the time-dependent coordinate transformation which allows performing precise modeling for a wide range of the key parameters governing the electrochemical detector performance. This allows defining a precise optimization procedure for its best efficiency upon considering the qualitative and quantitative effects of each of the main operational parameters.
Nonlinearities in Artificial Neural Systems Interpreted as an Application of Ising Physics
Authors: Garliauskas A.
Published: December 2019

In this review, the nonlinearities in different processes such as spin glasses, finite field models, Hamiltonian functions, learning and storing capabilities, mean field systems and others in the area of physics related to the artificial neural networks namely the main brain structure interpreted as Ising spin systems are discussed. It is shown that nonlinearities serve as exclusive role in the applied physics field.
Fiscal sustainability under the conditions of emerging longevity economy
Authors: Stepanova Olena
Published: December 2019

The article investigates the influence of the growing public expenditures on health caused by the demographic aging of the population, on the stability of public finances in the context of the establishment of the "longevity economy". The author conducts a scenario based assessment of the sustainability of public finances in Ukraine in the medium and long term, based on the calculation of the fiscal gap indicator.
In particular, investigated the "stress effect" of the changes in the indicators of macroeconomic development and the fiscal position on the sustainability of public finances under the condition of realization of the historical scenario. The author proves a significant influence of demographic aging of Ukraine's population on the sustainability of public finance. It is determined that in the long term there will be a fundamental transformation of the "spending profile" in the health care by sex-age groups, which, for example, is due to a shift in consumption of these expenditures by the population of older age groups and their increased share.
The author substantiates the necessity to expand the fiscal space for fulfilling the normative requirements of the Ukrainian legislation on health financing based on the calculation of the necessary structural primary balance to overcome the fiscal gap, which is proposed to be used as one of the benchmarks for the implementation of fiscal policy in order to attain medium and long-term sustainability of public finances for a given period of .fiscal adjustment. It is proposed: to monitor and control the pace and the growth factors of health care expenditures in the medium and long-term; to develop indicators for assessing the fiscal space for healthcare with due regard to potential change in the demographic structure of the population; to assess the transformation of the fiscal space to finance the health care in the context of the establishment of the longevity economy while respecting the sustainability of the system of public finances.
Effect of Interaction between Traits of Different Genotype Maize in Six Fertilizer Level by GGE Biplot Analysis in Hungary
Authors: Mousavi Seyed Mohammad Nasir , Kith Károly , Nagy János
Published: December 2019

Hungary was one of the main countries in the world as regards the yields reached in maize production. The research was conducted to appraise the effect of NPK fertilizer on traits of different hybrid maize (Fao410, Fao340) at the University of Debrecen and our experiment was carried out in Centre for Agricultural Sciences, Institute of Crop Sciences at Látókép in 2018. NPK fertilizer was applied in six different combinations (0-0-0 control, 30-23-27 first dose, 60-46-54 second dose, 90-69-81 third dose, 120-92-108 fourth dose and 150-115-135 fifth dose kg · ha−1). The result of compound variance showed the level of fertilizer and interaction between fertilizer and genotypes were significant in one percent. Effect of genotypes was a variable level of fertilizer and providing a different yield in the level of fertilizer. The weight of seeds in ear and weight of ear were important traits in the average yield on Fao410 hybrid. Also, the fourth of the fertilizer level was the best level of fertilizer for yield on Fao410 and Fao340. the weight of fresh plant and weight of seeds in ear were highest relation with yield in H340 hybrid. The results of this research can successfully contribute to the science of maize cultivars, the given adapted hybrid to the discovery of their traits and to an application of fertilizers.
Position and Perspective: Research Connections and Tensions in a Kindergarten Community
Authors: Kelly-Ware Janette Patricia
Published: December 2019

There are many stories worthy of telling in early childhood education research, and multiple perspectives to consider and critique in the processes of research, including children’s perspectives and positioning. Acknowledging position and perspective increases my awareness as a researcher of my relationship to what is being researched, how I create the subject that I am studying, and how I construct the knowledge of that subject. An increasing consciousness of the importance and relevance of reflexivity and how I stage the text are among the results of this exploration of research connections and tensions in a kindergarten community.
Efeito da Ansiedade Competitiva sobre a Tomada de Decisão em Jovens Atletas de Voleibol
Authors: Fortes Leonardo de Sousa , Fiorese Lenamar , Andrade Nascimento-Júnior José Roberto , Almeida Sebastião Sousa , Ferreira Maria Elisa Caputo
Published: December 2019

Resumo O objetivo do estudo foi analisar o efeito da ansiedade competitiva sobre a tomada de decisão de jovens atletas de voleibol. A amostra foi composta por 24 voluntários do sexo masculino (16,06 ±0,65 anos). Utilizou-se a versão brasileira do Competitite State Anxiety Inventory para avaliar a ansiedade competitiva. A tomada de decisão foi avaliada em situação real de jogo, adotando-se os critérios do Game Performance Assessment Instrument (GPAI). Localizaram-se correlações negativas da ansiedade cognitiva e ansiedade somática com o índice de tomada de decisão (p<0,05). Revelaram-se correlações positivas entre a “autoconfiança” e o índice de tomada de decisão (p<0,05). Revelou-se influência da ansiedade cognitiva, somática e autoconfiança no índice de tomada de decisão (p<0,05). Concluiu-se que a ansiedade pode ser considerada um fator interveniente na tomada de decisão.
Intercropping garlic in strawberry fields improves land equivalent ratio and gross income
Authors: Hata Fernando Teruhiko , Ventura Mauricio Ursi , Paula Maria Tereza de , Shimizu Gabriel Danilo , Paula Jean Carlo Baudraz de , Kussaba Deise Akemi Omori , Souza Nicholas Vieira de
Published: December 2019

ABSTRACT: Studies showed that intercropping garlic reduced pests in strawberry field crops. However, influence of intercropping on yield was not tested. The objective of the study was to evaluate the strawberry pseudofruit and garlic bulb productions in monocropping and intercropping systems. Assessments of the yields and calculation of the land equivalent ratio, competition ratio and gross income were performed. The experiments were conducted in three areas (two open field and one greenhouse) in Londrina municipality. Treatments in the field experiments were garlic or strawberry in monocrops (controls), strawberry (S) + one garlic row (GR), S + 2GR or S + 3GR per plot. In the greenhouse experiment, plants were grown in pots with following treatments: garlic or strawberry in monocrops, 2S + 2 garlic plants per plot (GPP), 2S + 4GPP or 2S + 5GPP. Similar yields (garlic bulbs and strawberry pseudofruits) were observed among the treatments. Intercropping garlic among strawberry plants increased the land equivalent ratio. The intercrop land equivalent ratio index ranged from 1.34 to 2.55. An increasing in gross income were observed when increasing garlic plant densities in intercropping with strawberry. Results showed that intercropping garlic with strawberry increases land equivalent ratio and gross income. Production of strawberry pseudofruits and garlic bulbs were not influenced by intercropping systems compared to monocropping.
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils
Authors: Fracetto Felipe José Cury , Fracetto Giselle Gomes Monteiro , Barros Felipe Martins do Rêgo , Lira Junior Mario de Andrade , Siqueira Neto Marcos
Published: December 2019

ABSTRACT: There are few studies of microbial diversity in castor bean soils in tropical semiarid environmental. Castor bean products have been widely used around the world justifying the commercial importance of ricinoculture in Brazil’ northeastern semiarid. There is no fertilization or maintenance of litter on the soils from the present study, so we hypothesized that the free-living diazotrophs microorganisms drive the nitrogen (N) input into these soils. We evaluated the communities’ structure and diversity of diazotrophs in tropical semiarid soils with i-Castor bean 50 years of cultivation intercropping with maize (CB-50); ii-Only Castor bean 10 years of cultivation (CB-10) and iii-soil under Caatinga vegetation (CAA). Nitrogenase enzyme activity was performed by the acetylene reduction assay (ARA) and the community profile of nifH gene was separated by denaturing gradient gel polyacrylamide electrophoresis (DGGE). Diazotrophs diversity was estimated by the Shannon (H’) and Simpson (D) indexes. Based on the maintenance of soil N stocks and N-microbial biomass over time, the activity of free-living diazotrophs was determinant in the N-input into these soils. The nifH gene was present and its profiles grouped the CB-50 with CAA treatments, so it reinforced the N-fixing by diazotrophs, which presented a greater diversity in the cultivated soils, even after the land use change for the castor bean implementation.
Efeito da Adição de Propileno aos Gases de Proteção Convencionais na Soldagem GMAW Aplicada a Juntas de Topo e Ângulo
Authors: Costa Guilherme Maranhão , Pereira Elaine Cristina , Paranhos Ronaldo Pinheiro da Rocha
Published: December 2019

Resumo O presente trabalho teve por objetivo avaliar a adição de 1,3% de C3H6 ao CO2 puro e 0,6% de C3H6 à mistura de Ar+25%CO2, na soldagem de aço carbono utilizando o processo Gas Metal Arc Welding (GMAW) aplicado em juntas de topo com chanfro em V e ângulo em T. As soldas foram realizadas utilizando chapas de aço SAE 1020, arame de solda ER70S-6 de 1,2 mm, distância bico de contato à peça (DBCP) de 12 mm, velocidade de soldagem de 300 mm/min e vazão do gás de proteção de 15 l/min. As velocidades de alimentação de arame (Valim) utilizadas foram de 4 m/min e 5 m/min com a tensão regulada na fonte definida com base nos sinais elétricos gerados. A análise qualitativa não apontou alterações dos cordões de solda causadas pela adição de C3H6. A avaliação dos sinais elétricos mostrou que a adição de C3H6 afetou a estabilidade do processo apenas para o Ar+25%CO2. Os resultados mostram que adição de C3H6 foi benéfica ao CO2, reduzindo a taxa de escória e de respingos, gerando um pequeno aumento na taxa de deposição, e aumentando os valores de garganta efetiva e penetração de raiz. Por outro lado, a adição de C3H6 ao Ar+25%CO2 não foi vantajosa, resultando em maiores quantidades de escória e respingos, e redução da taxa de deposição e penetração de raiz. A adição de C3H6 se mostrou mais efetiva na Valim de 5 m/min, proporcionando uma melhora do comportamento operacional do processo para o CO2, e uma redução nos valores dos índices de estabilidade para o Ar+25%CO2. A adição de C3H6 não resultou em alterações tanto da microestrutura da zona fundida (ZF) quanto nos valores de dureza. Foi possível concluir que a adição de C3H6 foi benéfica para o CO2, resultando em uma melhoria da estabilidade do processo e aumento da produtividade de forma geral, mas não apresentou vantagens para o Ar+25%CO2, reduzindo a eficiência e a estabilidade do processo.