bluuebunny/crossref_metadata_2025 huggingface dataset:
Sementes crioulas
Authors: Siquieroli Ana Carolina Silva , Martins Marcos Paulo do Carmo , Pena Daniel Mundim Porto , Silva Adriane de Andrade
Published: May 2020

O Centro de Incubação de Empreendimentos Populares Solidários (Cieps) vem desenvolvendo ações voltadas para a agricultura familiar dentro de uma perspectiva agroecológica. Torna-se importante o debate e a disseminação de saberes a respeito das Sementes Crioulas, as quais podem ser utilizadas para proporcionar maior autonomia aos agricultores familiares e assentados da reforma agrária, frente ao contexto de agricultura tecnificada e empresarial que os circunda. Assim, esse relato apresentou a experiência de uma Roda de Conversa que teve como objetivo principal a socialização de saberes e troca de experiências sobre Sementes Crioulas. A Roda de Conversa ocorreu durante a V Jornada Universitária em Defesa da Reforma Agrária em 2019, na Universidade Federal de Uberlândia. Foram apresentados alguns pontos para discussão e relatos dos participantes subdivididos nos seguintes temas: independência produtiva; preservação genética; e iniciando um banco de sementes. Trazer o tema para ser discutido com agricultores familiares e assentados da reforma agrária, em tempos de dominância consolidada dos pacotes tecnológicos recomendados pelo mercado convencional e muitas vezes inacessível ao produtor, contribui para que esses produtores viabilizem suas atividades agrícolas e possibilitem o desenvolvimento econômico social de forma independente.
Importância do monitoramento e disponibilização de dados hidrológicos para a gestão integrada dos recursos hídricos
Authors: Figueiredo Pereira Marco Alésio , Lippo Barbieiro Bruno , Muller de Quevedo Daniela
Published: May 2020

A conservação do meio ambiente, com a implementação de práticas visando o desenvolvimento sustentável e abordando a gestão integrada dos recursos naturais, é essencial para a manutenção do meio e da sociedade. Nesse sentido, este trabalho teve por objetivo  avaliar a possibilidade de implementar a Gestão Integrada de Recursos Hídricos - GIRH, a partir de dados hidrológicos disponibilizados no endereço eletrônico do Sistema Nacional de Informações sobre Recursos Hídricos (SNIRH) sob a responsabilidade da Agência Nacional de Águas – ANA. Para isso, o estudo apresenta as condições do monitoramento hidrométrico da bacia hidrográfica do Rio dos Sinos – RS e discutindo a importância da disponibilização de dados hidrológicos para a GIRH. A partir de informações disponibilizadas no SNIRH, fez-se uma pesquisa sobre as séries históricas de estações pluviométricas, fluviométricas e de qualidade da água instaladas na respectiva bacia, sendo avaliado se, a partir do monitoramento hidrométrico realizado, é possível a implementação da GIRH. Foi possível identificar que, a partir dos dados existentes, a implementação e a manutenção de uma GIRH fica comprometida. Constata-se que existem diversas entidades que monitoram os recursos hídricos na bacia, no entanto, quando disponibilizados, os dados observados por tais entidades são armazenados em sites específicos de cada instituição ou nem mesmo são disponibilizados, o que acarreta dificuldade de aquisição de dados para os usuários finais. Além disso, verifica-se a necessidade da ampliação da rede de monitoramento e a implantação de uma rede automática e telemétrica de monitoramento na bacia.
Paradigmatic Issues in State-of-the-Art Research Using Process Data
Authors: Winne Phil
Published: May 2020

Learning science is enthusiastically adopting new instruments to gather physiological and other forms of event data to represent mental states and series of them that reflect processes. In an attempt to provoke more thought about this kind of research, I suggest paradigmatic issues relating to data, analyses of them and interpretations of results. I advocate we not label these data as “objective.” Instead, we share a subjective interpretation of them. I argue propositions about validity need more nuance. Bounds on generalization related to so-called ecological validity are rarely empirically justified. When researchers transform raw data before analysis and when analytic methods partition variance, interpretations of results omit key qualifications. I posit emotion and motivation be positioned in theory as moderators rather than mediators because agentic, self-regulating learners make and revise knowledge by choosing forms of cognitive engagement in a context where they interpret arousal. I note that researchers’ anchor interpretations of process data in learners’ accounts. This creates a tautology that troubles usual notions of reliability. Finally, I recommend research involving process data turn more toward helping learners identify conditions of learning that spark arousal so learners can regulate motivation and emotion. This leads to a surprise: Treating learners as individuals and helping them identify triggers of arousal may recommend learning science cast emotions and motivation as epiphenomena.
Individual interest and learning in secondary school STEM education
Authors: Laine Erkka , Veermans Marjaana , Gegenfurtner Andreas , Veermans Koen
Published: May 2020

Interest research offers different hypotheses about the association between interest and learning outcomes. The standard hypothesis proposes that interest predicts learning outcomes: people acquire new knowledge about a topic they find interesting. The affective by-product hypothesis assumes that learning predicts interest: by learning something, people develop an interest in this topic. Finally, the reciprocal hypothesis states that interest and learning covary. This longitudinal study aimed to test the predictive validity of these three hypotheses in the context of secondary school STEM education. The participants were 104 Finnish 7th grade students aged 12-14. Data were collected at three times during the school year through questionnaires and grade evaluations in mathematics and biology. A partial least squares (PLS) path modeling approach was used to determine the relationships between interest and course grades across the three measurement points: at the beginning of the autumn semester, at the beginning of the spring semester, and after the spring semester at the end of the school year. The results differed between the autumn and spring semesters: During the autumn semester, students’ interest predicted their grades, whereas during the spring semester, grades predicted their interest. These findings indicate that the relationships between students’ individual interest towards science and mathematics with learning vary. As a practical implication, more focus should be put on when and what type of performance feedback is given to students with differing interest profiles.
Effects of Work and Recovery Duration and Their Ratio on Cardiorespiratory and Metabolic Responses During Aerobic Interval Exercise
Authors: Myrkos Aristides , Smilios Ilias , Zafeiridis Andreas , Iliopoulos Stilianos , Kokkinou Eleni M. , Douda Helen , Tokmakidis Savvas P.
Published: May 2020

Myrkos, A, Smilios, I, Zafeiridis, A, Iliopoulos, S, Kokkinou, EM, Douda, H, and Tokmakidis, SP. Effects of work and recovery duration and their ratio on cardiorespiratory and metabolic responses during aerobic interval exercise. J Strength Cond Res 36(8): 2169–2175, 2022—This study examined the effect of work and recovery durations and of work-to-rest ratio (WRR) on total exercise time and oxygen consumption (V̇o
2max), on exercise time above 80, 90, and 95% of V̇o
2max and HRmax, and on blood lactate concentrations during aerobic interval exercise. Twelve men (22.1 ± 1 year) executed, until exhaustion, 4 interval protocols at an intensity corresponding to 100% of maximal aerobic velocity. Two protocols were performed with work bout duration of 120 seconds and recovery durations of 120 (WRR: 1:1) or 60 seconds (WRR: 2:1), and 2 protocols with work bout duration of 60 seconds and recovery durations of 60 (WRR: 1:1) or 30 seconds (WRR: 2:1). When compared at equal exercise time, total V̇o
2 and exercise time at V̇o
2 above 80, 90, and 95% of V̇o
2max were longer (p < 0.05) in 120:120, 120:60 and 60:30 vs. the 60:60 protocol. When analyzed for total exercise time (until exhaustion), total V̇o
2 was higher (p < 0.01) in the 60:60 compared with all other protocols, and in the 120:120 compared with 120:60. Exercise time >95% of V̇o
2max and HRmax was higher (p < 0.05) in the 120:120 vs. the 60:60 protocol; there were no differences among protocols for exercise time >90% of V̇o
2max and HRmax. Blood lactate was lower (p < 0.05) in the 60:60 compared with all other protocols and in the 60:30 vs. the 120:60. In conclusion, when interval exercise protocols are executed at similar effort (until exhaustion), work and recovery durations do not, in general, affect exercise time at high oxygen consumption and HR rates. However, as work duration decreases, a higher work-to-recovery ratio (e.g., 2:1) should be used to achieve and maintain high (>95% of maximum) cardiorespiratory stimulus. Longer work bouts and higher work-to-recovery ratio seem to activate anaerobic glycolysis to a greater extent, as suggested by greater blood lactate concentrations.
Effects of Age and Maturation on Lower Extremity Range of Motion in Male Youth Soccer Players
Authors: Robles-Palazón Francisco Javier , Ayala Francisco , Cejudo Antonio , De Ste Croix Mark , Sainz de Baranda Pilar , Santonja Fernando
Published: May 2020

Robles-Palazón, FJ, Ayala, F, Cejudo, A, De Ste Croix, M, Sainz de Baranda, P, and Santonja, F. Effects of age and maturation on lower extremity range of motion in male youth soccer players. J Strength Cond Res 36(5): 1417–1425, 2022—Restricted joint range of motion (ROM) has been considered as a primary risk factor for some sport-related injuries. Consequently, preparticipation assessment of lower extremity joints ROM could help identify youth soccer players at high risk of injury and to aid in the design of tailored age and maturational specific training interventions. The purpose of this study was to analyze and compare the influence of chronological age and maturational stage on several lower extremity ROM measures, as well as to describe the lower extremity ROM profile using a comprehensive approach in youth soccer players. A total of 286 male youth soccer players' ROM were assessed including passive hip (extension [PHE], adduction with hip flexed 90° [PHADHF90°], flexion with knee flexed [PHFKF] and extended [PHFKE], abduction with hip neutral [PHABD] and flexed 90° [PHABDHF90°], external [PHER] and internal [PHIR] rotation), knee (flexion [PKF]) and ankle (dorsiflexion with knee flexed [ADFKF] and extended [ADFKE]) ROMs. Between-group differences were analyzed using a one-way analysis of variance (ANOVA) and magnitude-based decisions. The results only report statistically significant (p < 0.05; d > 0.5) and clinically relevant differences (>8°) for the PKF ROM between U12 vs. U19, and Pre-PHV vs. Post-PHV groups. Furthermore, approximately 40, 35, and 20% of players displayed restrictions in their PHFKE, PKF, and ADFKF ROM values, respectively. These findings emphasize the necessity of prescribing (across all age groups and periods of growth and maturation) compensatory measures in daily soccer training, and these exercises should be equally applied to both limbs with the aim of improving PHFKE, PKF and ADFKF ROM values.
Accuracy of Metabolic Cost Predictive Equations During Military Load Carriage
Authors: Vine Christopher A.J. , Coakley Sarah L. , Blacker Sam D. , Doherty Julianne , Hale Beverley J. , Walker Ella F. , Rue Carla A. , Lee Ben J. , Flood Tessa R. , Knapik Joseph J. , Jackson Sarah , Greeves Julie P. , Myers Stephen D.
Published: May 2020

Vine, CA, Coakley, SL, Blacker, SD, Doherty, J, Hale, B, Walker, EF, Rue, CA, Lee, BJ, Flood, TR, Knapik, JJ, Jackson, S, Greeves, JP, and Myers, SD. Accuracy of metabolic cost predictive equations during military load carriage. J Strength Cond Res 36(5): 1297–1303, 2022—To quantify the accuracy of 5 equations to predict the metabolic cost of load carriage under ecologically valid military speed and load combinations. Thirty-nine male serving infantry soldiers completed thirteen 20-minute bouts of overground load carriage comprising 2 speeds (2.5 and 4.8 km·h−1) and 6 carried equipment load combinations (25, 30, 40, 50, 60, and 70 kg), with 22 also completing a bout at 5.5 km·h−1 carrying 40 kg. For each speed-load combination, the metabolic cost was measured using the Douglas bag technique and compared with the metabolic cost predicted from 5 equations; Givoni and Goldman, 1971 (GG), Pandolf et al. 1997 (PAN), Santee et al. 2001 (SAN), American College of Sports Medicine 2013 (ACSM), and the Minimum-Mechanics Model (MMM) by Ludlow and Weyand, 2017. Comparisons between measured and predicted metabolic cost were made using repeated-measures analysis of variance and limits of agreement. All predictive equations, except for PAN, underpredicted the metabolic cost for all speed-load combinations (p < 0.001). The PAN equation accurately predicted metabolic cost for 40 and 50 kg at 4.8 km·h−1 (p > 0.05), underpredicted metabolic cost for all 2.5 km·h−1 speed-load combinations as well as 25 and 30 kg at 4.8 km·h−1, and overpredicted metabolic cost for 60 and 70 kg at 4.8 km·h−1 (p < 0.001). Most equations (GG, SAN, ACSM, and MMM) underpredicted metabolic cost while one (PAN) accurately predicted at moderate loads and speeds, but overpredicted or underpredicted at other speed-load combinations. Our findings indicate that caution should be applied when using these predictive equations to model military load carriage tasks.
ŞANLIURFA YÖRESİNE ÖZGÜ TIRNAKLI (DÜZ) EKMEKTE BAZI KATKI MADDELERİNİN KULLANIMININ EKMEK KALİTESİNE ETKİSİ
Authors: KÖTEN Mehmet , ÜNSAL Ahmet Sabri
Published: May 2020

Bu çalışmada Şanlıurfa yöresine özgü “Tırnaklı (düz) Ekmek”te bazı katkı maddelerinin kullanımının ekmek kalitesine etkileri araştırılmıştır. Bu amaçla, buğday ununa %10, 20, 30 oranlarında durum buğday unu (A), %0.3, 0.6, 0.9 oranlarında DATEM (monogliseridlerin diasetil tartarik asit esterleri) (B) ve 25, 50, 75 mg/kg C vitamini (C) katılarak tırnaklı ekmek üretilmiş ve ekmekler 48 saat süreyle depolanmıştır. Çalışmada, katkılı unlarda farinograf ve ekstensograf özellikler ile depolamanın 1. 24. ve 48. saatlerinde ekmeklerde nem ve duyusal özellikler belirlenmiştir. Elde edilen sonuçlara göre, katkıların farinografta su absorbsiyonu, stabilite süresi, yumuşama derecesi ve yoğurma tolerans sayısı üzerine etkisi önemli (p<0.05) bulunurken, gelişme süresi üzerine etkisi önemsiz (p>0.05) bulunmuştur. Oran artışına bağlı olarak katkıların askorbik asit hariç ekstensografta maksimum direnci artırdığı gözlenmiştir. Tüm depolama saatlerinde katkı kullanılarak üretilen ekmekler kontrole göre daha yüksek nem değerine sahip olmuştur. Depolama süresi boyunca tüm katkılı ekmeklerin tekstür ve tat-aroma puanları azalmıştır.
YOĞURT VE KEFİR KULLANILARAK ÜRETİLEN TEREYAĞLARININ BAZI ÖZELLİKLERİNİN İNCELENMESİ
Authors: ANLI Elif Ayşe , ŞANLI Tuba , ŞENEL Ebru
Published: May 2020

Çalışmada hammadde olarak yoğurt ve kefir kullanılarak üretilen tereyağı örneklerinin genel bileşim özellikleri, bazı kalite parametreleri ve duyusal özellikleri depolamanın 1., 30. ve 60. günlerinde karşılaştırmalı olarak incelenmiştir. Farklı starter kültür kullanılarak üretilen hammaddelere bağlı olarak, tereyağı örneklerinin titrasyon asitliği değerleri arasındaki fark istatistiksel olarak önemli bulunmuştur. Tereyağı örneklerinin lipolitik ve oksidatif stabilitesinin göstergesi olan asit ve peroksit değerleri, yoğurt ve kefirden üretilen tereyağı örneklerinde sırasıyla 0.89-1.11 mg KOH/g yağ ve 0.19-0.40 mek O2/kg yağ arasında saptanmıştır. Söz konusu değerler tereyağında tat bozukluklarının oluştuğu bildirilen sınır değerlerin altında bulunmuştur. Örnekler arası renk farklılığını ortaya koyan ΔE değerine göre özellikle depolamanın 30. gününde kefirden üretilen tereyağının renginin belirgin olarak farklı olduğu saptanmıştır. Duyusal analiz sonuçlarına göre, yapı ve görünüş özellikleri bakımından örnekler arasında belirgin fark olmadığı, buna karşın; tat ve koku ve genel kabul edilebilirlik özellikleri yönünden örnekler arasında farklılık olduğu ve kefirden üretilen tereyağı örneğinin daha fazla beğenildiği saptanmıştır.
Carga de mortalidad atribuible a inactividad física, Colombia 2015
Authors: Chaparro Narváez Pablo Enrique
Published: May 2020

La inactividad física (IF) es un problema de salud pública y factor de riesgo para enfermedades no transmisibles (ENT). El objetivo fue estimar la carga de mortalidad por ENT atribuibles a IF en personas de 25 a 64 años de edad durante 2015 en Colombia; y las muertes por ENT potencialmente prevenibles considerando reducción en la prevalencia de IF de 15%.Se empleó información del estudio de carga mundial de enfermedad 2016, de defunciones del DANE y Encuesta Nacional de la Situación Nutricional 2015. Se calcularon prevalencia de IF y riesgo atribuible poblacional (%) (%RAP). Se estimó el número de muertes potencialmente prevenibles con reducción del 15% en la prevalencia de IF.La prevalencia de IF fue 50.1%, la mortalidad por ENT atribuidas a IF 16.2%. El %RAP fue mayor para enfermedad isquémica cardiaca, diabetes mellitus y tumor maligno de colon. Al reducir 15% la prevalencia de IF, el %RAP mostró mayor disminución para enfermedad isquémica cardiaca, accidentes cerebrovasculares y diabetes mellitus. En Colombia, para 2015, 50.1% de mortalidad por ENT fue atribuible a IF. Se proyectó reducción adicional de 12.6% en muertes por ENT al disminuir en 15% la prevalencia de IF.
Índice de masa corporal versus concepto de autoimagen corporal en profesionales de estética
Authors: Moreno Collazos Jorge Enrique , Bermudez Harold , Pinzón Ríos Iván Dario
Published: May 2020

El auto concepto de la imagen corporal es de vital importancia al momento de generar definiciones claras del cuidado del cuerpo en los profesionales que atienden a los colectivos desde la perspectiva cosmética en los centros de estética. Comparar el índice de masa corporal frente a la medición de la autoimagen corporal del en un grupo de trabajadores de un centro de estética. Se realizó un estudio de tipo descriptivo de corte transversal en el periodo de febrero a junio de 2018 en trabajadores pertenecientes a un centro de estética de la ciudad de Bogotá.La población de estudio estuvo conformada por 31 sujetos trabajadores del área de estética corporal con un promedio de edad de 28.77 ± 8.11.Se encuentran diferencias estadísticamente significativas entre la autopercepción de la silueta corporal y el índice de masa corporal percibido frente al evaluado en los trabajadores del centro estético. Por ello es importante establecer el concepto de imagen corporal en los trabajadores, lo cual favorece al auto concepto de cuidado del cuerpo sano trascendiendo a conductas de hábitos saludables para la prevención de enfermedades y control en el comportamiento de los indicadores de salud pública.
Caracterización social de la evaluación de los aprendizajes apoyada en entornos virtuales (autonomía, aprender a aprender y competencias), en la Escuela de Ciencias Exactas y Naturales (UNED)
Authors: Calderón Badilla Yency , Ulate Sánchez Rosita
Published: May 2020

Con el propósito de generar una caracterización social de la evaluación de los aprendizajes apoyada en entornos virtuales, en la Escuela de Ciencias Exactas y Naturales de la Universidad Estatal a Distancia en Costa Rica, se planteó una investigación con un enfoque cualitativo y comparativo de tres variables temáticas: la autonomía, la capacidad de aprender a aprender y el desarrollo de competencias de los estudiantes en su proceso de aprendizaje. Participaron treinta y cinco personas de cinco carreras, en sesiones de grupo y entrevistas a profundidad. Del análisis de las categorías estudiadas, se observa la toma de decisiones de los estudiantes en la resolución y la organización de las tareas evaluativas, especialmente, para desarrollar capacidades de aprender más allá de su vida como aprendices. Igualmente, la mediación pedagógica fue uno de los aspectos de motivación más importantes para el estudiantado, aspecto por considerar en la planeación de los entornos virtuales. Por su parte, los participantes coincidieron en que sí se generan competencias intelectuales, sociales, personales y profesionales, como el uso de la tecnología, la capacidad de organización y planificación, la comunicación escrita, la gestión de la información, el compromiso con el aprendizaje y la generación de conocimientos para la sociedad.
Transdisciplinariedad y pedagogía: apuntes para el debate sobre la (in)disciplina del pedagogo
Authors: Valladares Liliana
Published: May 2020

En este ensayo, se reflexiona en torno al carácter transdisciplinario de la pedagogía y su relación con la identidad “híbrida” del pedagogo. Se revisan diferentes aproximaciones teóricas a la multi-, inter- y transdisciplinariedad en el estudio de la educación y se retoma, de forma sintética, la discusión alrededor del estatus epistemológico de la pedagogía. Se discute sobre si es posible comprender hoy la educación y el quehacer del pedagogo unidisciplinariamente; si puede la pedagogía considerarse transdisciplinaria, y si es la identidad híbrida del pedagogo una expresión del carácter transdisciplinario del estudio de la educación.
El acompañamiento ignaciano en el siglo XXI
Authors: Arroyo Lewin María Angélica , Bermúdez García José Ángel
Published: May 2020

En los comienzos del siglo XXI, vivimos una época de incertidumbre y perplejidad histórica, dominada por la confusión, el desorden y la desesperanza. Ante este nuevo contexto, el acompañamiento ignaciano emerge como una esperanza y una propuesta pedagógica para orientar a los jóvenes actuales a quienes les toca vivir y afrontar una nueva realidad cultural. El objetivo de este ensayo es describir las características esenciales del acompañamiento ignaciano en el contexto contemporáneo. Las consideraciones que se alcanzaron son: el acompañante ignaciano es una persona de fe, íntegra y un maestro con un perfil particular; el acompañamiento conduce al educador y al educando en diálogo hacia una formación integral, humana y en la fe; y el acompañamiento ignaciano requiere hacer uso de las herramientas del mundo digital, para guiar al joven desde sus espacios naturales de relación cotidiana.
Determinación de intervalos básicos de salud en tortugas resbaladoras (Trachemys scripta emolli) del Refugio de Vida Silvestre Caño Negro, Costa Rica
Authors: Fournier-Gutiérrez Laura , Herrero Marco V. , Barrantes-Barrantes Rosibel , Blanco-Peña Kinndle
Published: May 2020

El objetivo de este trabajo es determinar los parámetros sanguíneos y la presencia de parásitos en una población salvaje de tortugas deslizantes (Trachemys scripta emolli), durante la estación seca de 2013, en el Refugio de Vida Silvestre Caño Negro, Costa Rica. Utilizando redes, los individuos fueron capturados de diferentes huecos. Se tomó muestras de sangre para determinar los parámetros químicos de esta y el hematocrito, así como los valores morfológicos y las condiciones corporales. Además, se recolectaron muestras de heces y ectoparásitos. El IC del hematocrito 95.0 % fue [14 7091, 18 7356] y no se encontraron diferencias significativas entre los sexos. Los IC del 95 % para los parámetros de la química sanguínea fueron: AST (U/L) [87 6214, 148 929], CK (U/L) [1439.2, 2487.08], AU (umol/L) [68.22, 90.43], GLU (mmol/L) [4.26, 5.47], PHOS [0.46, 0.61], Ca (mmol/L) [1.99, 2.15], PT (g/L) [22.16, 24.44], K (mmol/L) [3.31, 3.83 ] y Na (mmol/L) [127.92, 130.93]. También se obtuvo 21 muestras de heces, de las cuales 10 fueron positivas para parásitos (23.8 % Strongyloides, 14.3 %  Ascaridia, 9.5 % Coccidia y 9.5 % Pentastomida). Una sanguijuela de la familia Rhynchobdellidae fue el único ectoparásito encontrado (Placobdella sp.). Ninguno de los individuos estaba enfermo o presentaba abscesos en relación con sus atributos morfológicos. Según los resultados, el manejo empleado no representa un riesgo para esta población de reptiles.
Description and implementation of an algebraic multigrid preconditioner for H1-conforming finite element schemes
Authors: Guillén-Oviedo Helen , Ramírez-Jiménez Jeremías , Segura-Ugalde Esteban , Sequeira-Chavarría Filánder
Published: May 2020

This paper presents detailed aspects regarding the implementation of the Finite Element Method (FEM) to solve a Poisson’s equation with homogeneous boundary conditions. The aim of this paper is to clarify details of this implementation, such as the construction of algorithms, implementation of numerical experiments, and their results. For such purpose, the continuous problem is described, and a classical FEM approach is used to solve it. In addition, a multilevel technique is implemented for an efficient resolution of the corresponding linear system, describing and including some diagrams to explain the process and presenting the implementation codes in MATLAB®. Finally, codes are validated using several numerical experiments. Results show an adequate behavior of the preconditioner since the number of iterations of the PCG method does not increase, even when the mesh size is reduced.
Stationary Navier–Stokes equations with non-homogeneous boundary condition in a system of two connected layers
Authors: Kaulakytė Kristina
Published: May 2020

In this paper the stationary Navier–Stokes system with non-homogeneous boundary condition is studied in domain which consists of two connected layers. The extension of the boundary value, which reduces the non-homogeneous boundary problem to the homogeneous one, is constructed in this paper.
Properties of the averaging along the characteristics hyperbolic of the system operator
Authors: Krylovas Aleksandras , Lavcel-Budko Olga
Published: May 2020

Examing the averaged equations system with periodic initial conditions. Proved the lemmas, which allow to reorganize the system in to the form similar to a semi-linear hyperbolic system written in Riemann invariants. This allows to set conditions for the existence of the solution.
Delay dependent from the goods of the price in the Kaleckian model
Authors: Barzdžiukas Raimondas , Eitkevičiūtė Rasa , Švitra Osvaldas
Published: May 2020

In this article we investigate models of economical growth, where delay depends on appropriate solutions, i.e., prices of goods.
Application of clustering in statistical analysis of music data
Authors: Kavaliauskas Mindaugas
Published: May 2020

In this article author analyses musical works of Lithuanian compositors using statistical methods. Markov chains are used to describe compositions. Stationary distributions are used as feature vectors for clustering. A few interpretations of clusters are presented. Possibility to use feature vectors to identify the unknown author of composition is tested.
Application of dynamic damper for system with restriction excitation
Authors: Zaksienė Genovaitė
Published: May 2020

The model of dynamic damper was applied for suppression of oscillations of the nonlinear mechanical system.
Adjustment of norm-referenced and criterion-referenced evaluations of students’ knoweledge
Authors: Navickienė Olga , Krylovas Aleksandras
Published: May 2020

Any evaluation of knowledge is performed in accordance with one of the two principles of evaluation – normative or criteria. An evaluation criterion is based on student’s knowledge (abilities, skills, competencies) comparison with certain standards usually described in a programme of a subject. Knowledge of students of almost all Lithuanian universities is evaluated in such principle. Another evaluation – normative – provides a comparison of outcomes with each other. For example, students are assessed in state examinations. Theoretical and practical aspects of normative evaluation and possibilities to apply them to assess students’ knowledge are discussed in this article.
The analysis of evolution of the State graduation exam in mathematics
Authors: Pekarskas Vidmantas Povilas
Published: May 2020

An overview on changes in the structure and topics of the State graduation exam in mathematics in the period from 1999 until 2012 is given in this paper. Topics frequently introduced in the contents of the exam and topics unpopular amongst the organizers of the exam are singled out. It is determined that more complex nonstandard problems have disappeared from the contents of the exam.
Problems of mathematics subject integration into module studies
Authors: Saldauskienė Jovita
Published: May 2020

This article deals with relevant problems of mathematics’ subject studies in College. There are presented the development and essential issues of mathematics‘ subject integration into economics module studies. The presented analysis reveals further directions of mathematics quality improvement search.
Traffic flow forecasting model
Authors: Andziulienė Beatričė , Stanelytė Daiva , Drungilas Darius
Published: May 2020

The paper presents a mathematical model based on multicriteria decision making method of the Analytic Hierarchy Process for determining the critical network of railway lines, which prevented the flow of traffic growth, the line bandwidth, traffic volume and train speed. The presented model using real data and expert evaluation can be used for the renovation work schedules of railway lines (infrastructure, telecommunications, etc.).
Analysis of Fast Fourier Transformations algorithm for CUDA Architecture
Authors: Andziulienė Beatričė , Žulkas Evaldas , Kuprinavičius Audrius
Published: May 2020

In this work Fast Fourier transformation algorithm for general purpose graphics processing unit processing (GPGPU) is discussed. Algorithm structure and individual stages performance were analysed. With performance analysis method algorithm distribution and data allocation possibilities were determined, depending on algorithm stages execution speed and algorithm structure. Ratio between CPU and GPU execution during Fast Fourier transform signal processing was determined using computer-generated data with frequency. When adopting CPU code for CUDA execution, it not becomes more complex, even if stream procesor parallelization and data transfering algorith stages are considered. But central processing unit serial execution).
An algorithm for the assessment of several small rates
Authors: Sakalauskas Leonidas , Vaičiulytė Ingrida
Published: May 2020

The present paper describes the empirical Bayesian approach applied in the estimation of several small rates. Modeling by empirical Bayesian approach the probabilities of several rare events, it is assumed that the frequencies of events follow to Poisson’s law with different parameters, which are correlated Gaussian random values. The unknown parameters are estimated by the maximum likelihood method computing the integrals appeared here by Hermite–Gauss quadratures. The equations derived that are satisfied by maximum likelihood estimates of model parameters.
Osculating curves and surfaces
Authors: Navickis Kazimieras
Published: May 2020

Osculating circle and osculating sphere have been studied in classical differential geometry [1]. In this article the osculating curves and surfaces of higher order of plane and space curves in Euclideann-space (n = 2, 3) is considered. We study the intrinsic differential geometry of curves by analyzing their contact with curves and surfaces of higher order.
Survey of LEU olympiad 2013 for young mathematicians
Authors: Jakaitytė Eglė , Kaučikas Algirdas , Mazėtis Edmundas
Published: May 2020

The texts and solutions of the LEU young mathematicians olympiad – 2013 are presented.
Application of Greimass semiotics in analysis of mathematical texts
Authors: Kudžma Ričardas , Preidytė Simona
Published: May 2020

Nowadays one can see increase in analysis of mathematical textbooks. Even special conferences are running for this topic. Both authors of this article are taking part in Nordisk Network for research on mathematics textbooks in the Nordic countries. In this article semiotics of A.J. Greimas is being applied for analysis two mathematical texts about positive and negative numbers for grade 6 from different books. Analysis allows evaluate the quality of texts.
Madhava’s formulae
Authors: Mačys Juozas Juvencijus
Published: May 2020

Two hypotheses on the derivation of Madhava’s corrections of the series for number π are considered.
Weyl algebra based key exchange protocol
Authors: Dvirnas Albertas
Published: May 2020

In this article we introduce the Weyl algebras as a platform algebra for a key exchange protocol based on the decomposition problem. In order to use it as a platform, we prove one propery of the Weyl algebra, related to it’s centralizer. Furthermore, we provide a scheme for the protocol and examples for the Weyl algebra and for the Weyl algebra with additional relations.
Some methodological aspects of modeling
Authors: Kastickaitė Joana
Published: May 2020

This article examined the typology of models M. W. Wartofsky, model relationship with modeling. The model uses the idea of realization, and the dynamic aspect of the model as a means to an end.
Conditions of resonance interaction of acoustic periodic waves interaction
Authors: Lavcel-Budko Olga , Krylovas Aleksandras
Published: May 2020

We consider differential equations of gas dynamics, when the thermal conductivity and viscosity coefficients equal zero. The system is supplemented with equations of state for the gas pressure and the total energy; these equations do not depend on the properties of gas, i.e. are of a general form. We construct asymptotical approximation for the resonance interaction of acoustic periodic waves, which is uniformly valid in the long time interval. A system coefficient allows determining the resonance occurring condition the relation between gas pressure and temperature at the initial time. We investigate the ideal and non-ideal gas and determine the relationship between the parameters, which causes the of resonanse vanishing in non-ideal gas.
Research of the demand for teachers
Authors: Petkus Tomas , Karaliun Ilona
Published: May 2020

The demand for the nature science, mathematics and technologies teachers in Lithuania has been forecasted in this paper. This forecasting is a complex process because it is affected by many factors, such as the birth rate, staff numbers, teachers age, immigration and emigration, etc. The forecast is based on data from the Statistics Lithuanian, the register of teachers, the labour exchange. It is taking into account the current and predicted emigration, the wastage of the number of pupils,moving from a lower to a higher class, as well as the number of teachers in training.
Analysis of maximum air temperature distribution
Authors: Jokimaitis Arvydas , Petronaitis Darius
Published: May 2020

The article authors detected distribution estimates of maximum air temperature. Also estimated ultimate temperature record and found quality of temperature record.
Mathematics learning organization problems, when we teach children generation Z
Authors: Novikienė Regina
Published: May 2020

Taking into account the specific features of Z-generation children, the article is the proposed model of learning mathematics and developed problems hindering its realization. The main problems are: lack of students mathematical text reading skills; lack of self-control specifically designed electronic instruments; lack of bright students or programs differentiation.
Juozas Baltūsis – the eminent mathematics teacher in the 20th–60th years of the 20th century in Lithuania
Authors: Ažubalis Algirdas
Published: May 2020

Mathematics teacher Juozas Baltūsis (1900–1994) started his pedagogical activities in the 20th years of the 20th century and retired on a pension in the 70th years of the century. Within over 40-year period of his pedagogical activities, he taught many future mathematicians and engineers; he worked individually with gifted pupils and encouraged them to participate mathematical contests. The teacher took a great interest in integration of the teaching mathematics with the real life and other school subjects. In the prewar period, he compiled 3 course-books and in the postwar period – 3 papers; in the said works, he implemented the ideas on integration in practice.
Statistical benchmarking of voting theory methods
Authors: Krylovas Aleksandras , Kosareva Natalja
Published: May 2020

In the article 8 candidates sorting algorithms were compared by Monte Carlo experiments. 6 of them are constructed on the basis of voting theory and 2 – on the basis of Kemeny median. The largest number of correct decisions averages and the least average number of unfinished voting procedures were shown by the median-based sorting algorithms.
Weights balancing method using entropy values in solving MCDM problem
Authors: Krylovas Aleksandras , Kosareva Natalja
Published: May 2020

The article shows how multiple criteria optimization problems could be solved by application of modified KEMIRA method, when there are three groups of criteria. Criteria priorities are determined by the entropy, criteria weights are calculated by solving optimization task. The proposed method allows to find one of several possible local extrema.
The statistical analysis of the data of one school SEN pupils
Authors: Piaseckienė Karolina , Ranonienė Vilma
Published: May 2020

In the educational process, the special educational needs (for brevity, SEN) are the needs for help and services arising from children’s congenital or acquired disorders and adverse environmental factors. In this article, we analyse statistically the data of pupils with SEN. We create the logistic regression model to describe what determines the proportion of boys among all SEN pupils in certain school.
Integration of the several MCDM results according to methods importance
Authors: Vinogradova Irina
Published: May 2020

Multiple criteria decision making methods (MCDM) are widely used in different areas. In theory the best or the most suitable method isnt defined, so in order to ensure the correct decision, often several MCDM are used. In the case MCDM results of the methods are different, the solution is ambiguous. In this publication, to make decision based on several MCDM, it is proposed to combine all used methods results in a single value, according to importance of the methods in the solvabletask. The method, which is more stable to small changes of the data, has a higher importance (weight) for integrated result. The results of different methods are not comparable with each other, for this reason it is necessary to normalize the obtained data, to unify their scale.
Effectiveness of mathematics teacher performance
Authors: Sičiūnienė Viktorija
Published: May 2020

This article represents conclusions about an effective mathematics teachers’ work. These conclusions were derived linking teachers questionnaire data to their students test results. Eighth grade student test results were taken from national 2012 and 2014 year student achievement test database. Descriptive statistics, statistical correlation analysis, clustering and generalization methods were used at this research. This article describes an effective working teacher behavior and provides teacher development directions, which in the near future are expected to improve student achievements.
Mathematician Ignas Saudargas (1902–1987)
Authors: Ažubalis Algirdas
Published: May 2020

Ignas Saudargas (1902 – 1987) graduated from Vytautas Magnus University in 1932, he studied mathematics. Until the end of World War II worked as a teacher at gymnasiums of Lithuania. He was good teacher, actively participated in  extracurricular activities, always was trying to improve his educational qualifications. After the World War II, he was invited to teach mathematics in universities of Kaunas. I. Saudargas was known for high demands for his students.
Discrimination power of knowledge testing items
Authors: Krylovas Aleksandras , Kosareva Natalja , Karaliūnaitė Julija
Published: May 2020

In the article one fuzzy classification algorithm of dichotomous test questions is proposed. Depending on the level of knowledge measured by the test, the test item for example may well differentiate whether all testees or only testees with strong or only with weak level of knowledge; as well as the test item may badly differentiate testees and therefore be inappropriate. In the research fuzzy sets mathematical theory is used.
Weak resonances of periodical nonlinear oscillations
Authors: Lavcel-Budko Olga , Krylovas Aleksandras
Published: May 2020

The mathematical model of nonlinear oscillations of weightless string is analyzed. Coefficients of the mathematical model and initial conditions are periodical functions of the space variable. A multiscale perturbation technique and integrating along characteristics are used to construct asymptotic solution without secular members.
Multi-agent system for computer science and engineering education
Authors: Meleško Jaroslav , Kurilovas Eugenijus , Krikun Irina
Published: May 2020

The paper aims to analyse application trends of intelligent multi-agent systems to personalise learning. First of all, systematic literature review was performed. Based on the systematic review analysis, the main trends on applying multi-agent systems to personalise learning were identified. Second, main requirements and components for an educational multi-agent system were formulated. Third, based on these components a model of intelligent personalized system is proposed. The system employs five intelligent agents: (1) learning styles identification software agent, (2) learner profile creation software agent, (3) pedagogical suitability software agent, (4) optimal learning units/scenarios creation software agent, and (5) learning analytics/educational data mining software agent.
Multilayer perceptron for face recognition
Authors: Toliušis Ričardas , Kurasova Olga
Published: May 2020

In this paper, an algorithm is proposed which uses facial landmarks to calculate normalized Euclidean distances between different facial parts and performs faces recognition by using Multilayer Perceptron. In order to determine the most effective model, different neural network parameters have been changed in an experimental way, such as hidden layers and the number of neurons, gradient descent optimization algorithms, error and activation functions, and different sets of distances.
Low incidence of Schmallenberg virus infection in natural cases of abortion in domestic ruminants in Hungary
Authors: Szeredi Levente , Dán Ádám , Malik Péter , Jánosi Szilárd , Hornyák Ákos
Published: May 2020

An epizootic caused by a new orthobunyavirus called Schmallenberg virus (SBV) was recognised in European ruminants in 2011 and 2012. The re-emergence of the infection was reported in several countries in the subsequent years. Although the main clinical sign of SBV infection is abortion, the impact of SBV in natural cases of abortion in domestic ruminants had not been systematically examined before this study. The aim of the study was to investigate the role of SBV infection and to compare it to the importance of other causes of abortion by examining 537 natural cases of abortion that had occurred between 2011 and 2017 in Hungary. The cause of abortion was determined in 165 (31%) cases. An infectious cause was proved in 88 (16%) cases. SBV infection was found only in a total of four cases (0.8%) using real-time polymerase chain reaction. Three of them proved to be inapparent SBV infection, and one case was attributed to SBV-induced abortion by detecting non-purulent encephalitis and SBV nucleoprotein by immunohistochemistry in a brain tissue sample. According to the results, SBV played a minor role in natural cases of domestic ruminant abortion in Hungary during the 7-year period following the first SBV outbreak in 2011.
Detection of cyprinid herpesvirus 1 (CyHV-1) in barbel (Barbus barbus): First molecular evidence for the presence of CyHV-1 in fish other than carp (Cyprinus carpio)
Authors: Borzák Réka , Sellyei Boglárka , Baska Ferenc , Székely Csaba , Doszpoly Andor
Published: May 2020

Two adult barbels (Barbus barbus) with visible skin tumours were subjected to histopathological and molecular examinations. The fish were caught in the River Danube near Budapest. Papillomas were found around their oral cavity, at the operculum and at the pectoral fins, while epidermal hyperplasias were seen on the body surface. Cyprinid herpesvirus 1 (CyHV-1) was detected in the kidney of the specimens by polymerase chain reaction (PCR), and barbel circovirus 1 (BaCV1) was found in all internal organs and in the tissues of the tumours. The whole genome of BaCV1 and three conserved genes from the genome of CyHV-1 were sequenced. Previously, BaCV1 had been reported only once from a mass mortality event among barbel fry. The whole genome sequence of our circovirus shared 99.9% nucleotide identity with that of the formerly reported BaCV1. CyHV-1 is known to infect common carp and coloured carp (Cyprinus carpio), and has been assumed to infect other cyprinid fish species as well. We found the nucleotide sequences of the genes of CyHV-1 to be identical in 98.7% to those of the previous isolates from carp. To the best of our knowledge, this is the first molecular confirmation of the presence of CyHV-1 DNA in cyprinid fish species other than carp.
A pilot study on the pharmacokinetics of a single intramuscular injection of cefquinome in Arabian camel calves
Authors: Altayban Abdullah , Kandeel Mahmoud , Kitade Yukio , Al-Nazawi Mohammed
Published: May 2020

This study was conducted to evaluate the pharmacokinetics of cefquinome in camel calves after a single intramuscular injection in a dose of 2 mg/kg body weight (kg b. w.). Cefquinome concentrations were measured by ultra-high performance liquid chromatography–mass spectrometry (UPLC-MS/MS). A non-compartmental pharmacokinetic model was used to fit the time–concentration curve and estimate the pharmacokinetic parameters. The peak serum concentration (Cmax) was 28.4 μg/mL at the time of maximum concentration (Tmax) of 25 min. The elimination half-life (t1/2) was 17.4 h. The area under the concentration–time curve (AUC0–∞) was 103.7 μg/ml−1h and the mean residence time (MRT0–∞) was 21.3 h. In comparison with other animal species, the pharmacokinetics of cefquinome in Arabian camel calves showed faster absorption from the site of injection and slower elimination. Since cefquinome, as other beta-lactams, is a time-dependent antimicrobial agent, a single dose of 2 mg/kg b. w. might be sufficient against the most sensitive organisms in camel calves owing to its prolonged elimination phase. However, dose readjustment is required for cases needing concentrations above 2 µg/mL for 12 h or above 1 µg/mL for 24 h.
Intestinal ganglioneuroma in a neonatal Japanese black calf – Short communication
Authors: Sasaki Jun , Kuroda Yusuke , Ueki Atsushi , Devkota Bhuminand , Yamagishi Norio
Published: May 2020

A 1-day-old male calf presented with clinical signs of severe progressive abdominal distension. Abdominal radiographic and ultrasonic images revealed several loop-like structures in the small intestine, which were indicative of gas retention. Experimental laparotomy was performed. However, the calf died during surgery. At necropsy, a round, well-circumscribed mass (3 × 3 × 2.5 cm) was found in the jejunal wall, and the jejunal lumen was narrowed. The mass was firm and had white to grey appearance on the cut surface. Histologically, the submucosa and the muscle layer were diffusely thickened due to abundance of neural tissues comprising several fascicles of nerve fibres and large aggregates of ganglion cells. Some ganglion cells contained basophilic Nissl substances in their cytoplasm. Immunohistochemically, these cells were positive for S-100 and synaptophysin. Ultrastructural examination revealed that the neoplastic ganglion cells contained dense core vesicles in the cytoplasm. Based on these findings, the neoplastic lesion was diagnosed as ganglioneuroma in the jejunum.