bluuebunny/crossref_metadata_2025 huggingface dataset:
COMPARISON BETWEEN DIFFERENT SURVIVABILITY MEASURES ON A GENERIC FRIGATE
Authors: Liwång H , Jonsson H
Published: December 2021

Choosing suitable survivability measures is a demanding task that has to start early in the ship design process. Throughout the design process there is a need for compromises that will define and sometimes limit future operations or capabilities. In this study generic survivability measures are compared. The study also examines the sensitivity of the calculated probabilities to changes in the threat description. The result shows that it is important to investigate the total effect of a hit over a set of relevant ship functions defined for example by survivability levels. The calculations for different threat definitions show that the changes in survivability are substantial when the threat definition is changed. Moreover, the effects of different hit assumptions differ between weapon types. This must be treated as an uncertainty which also should be reflected in the output and weighted into the decisions made, based on the survivability analysis.
RISK ASSESSMENT OF ARCTIC NAVIGATION BY USING IMPROVED FUZZY-AHP APPROACH
Authors: Sahin B , Kum S
Published: December 2021

In this study, navigational risk factors of the Arctic Ocean are defined and numerical weights of each risk are obtained by using Improved Fuzzy Analytical Hierarchy Process (IF-AHP) method after conducting expert consultations. The Northern Sea Route shortens the maritime distance approximately 7000 nautical miles comparing to the conventional Suez Canal route. Therefore, it takes a significant role of being economic and time advantage for global logistics. Its geographical position, presence of ice, heavy weather conditions, strong currents and winds are some risks for Arctic transportation. There always have the possibility of unpredictable catastrophes such as a collision, grounding, hull damage and etc. in this region. Reflections of such unwanted incidents might be very costly for economic, political, environmental and safety concerns. Due to there are limited academic studies regarding to analytical and systematical risk identification and determination of risk levels, this study contributes to complete this academic gap.
STANDARDISING THE DESIGN AND PRODUCTION OF MOORING WINCHES THROUGH MORE COHESIVE REGULATIONS: A NECESSARY STEP
Authors: Carral J , Carral L , Fraguela J , Villa R
Published: December 2021

Stricter guidelines, hand in hand with continuous technological advances, mean that vessels are safer and more efficient. At the same time, these changes make ships more complex and expensive. However, this is not the case with mooring equipment. Regulations vary in content, but have the same objective. They fail to improve the ships’ safety and prices are negatively affected. A vessel’s mooring system has to take into account various sets of regulations, including those of the country under whose flag it is sailing; the classification societies; ship owner associations and the terminal ports. This paper will analyse the contents of all these regulations in an attempt to find what they have in common. Its next purpose is to propose guidelines with unified contents. The proposal is to harmonise regulations that affect the mooring winch’s operation, design and construction. With standardised regulations, it would be possible to carry out a single design process and one calculation for components. These steps will be apt for every kind of project. By unifying this process, the final price of manufacturing equipment will be reduced.
UNSTEADY CHARACTERISTICS OF LIFT GENERATED BY SMALL UNDERWATER CONTROL FIN
Authors: Yoshida M , Iwashita H , Kanda M , Kihara H , Kinoshita T
Published: December 2021

Speed reduction or slamming must be restricted for a high-speed oceangoing vessel because of the requirement for punctuality and the high value of the cargo. Speed reduction and slamming are caused by large amplitude motions in waves. A promising ship form for such vessels is so-called “Resonance-Free SWATH (RFS)”, which has negative pitch and roll restoring moments due to the extraordinary small water plane area. As a consequence, the resonance peak is removed from the motion response. The attitude of the RFS with negative restoring moments is adjusted by four pairs of control fins attached to the fore and aft ends of the lower hulls. In previous studies, the steady value of the lift-curve slope is usually used in the motion equation of the frequency domain. However, when working in waves, the controlling fins are not working in a steady state and the lift coefficient is no longer a constant. In addition, there exists a phase lag between the change in the attack angle and the fin-generated lift. In the present study, theoretical predictions using a frequency-domain 3D-Rankine Panel Method, as well as experimental measurement, have been made to analyze the phenomena of the lift generation including the phase lag and the interference between fins, the lower hulls and the struts. The theoretical results agree well with the experimental results in spite of the potential theory being without viscosity. Next, the unsteady characteristics of fin-generated lift are expressed as the function of the encountering wave frequency. Then the effects of the fore fins, the lower hulls and struts on the lift curve-slope of the aft fins are discussed.
STRESS DISTRIBUTION IN THE HOLLOW STIFFENED HYBRID LAMINATED COMPOSITE PANELS IN SHIP STRUCTURES UNDER SINUSOIDAL LOADING
Authors: Sit M , Ray C , Biswas D , Mandal B
Published: December 2021

A simplified hollow stiffened hybrid laminated plate model has been developed for the marine structures. The detailed stress analysis through the thickness of the stiffened plate based on the higher order shear deformation theory has been carried out under sinusoidal loading. The hybrid laminates are made by wrapping the GFRP laminates with CFRP at the outermost layers of the stiffened panel. This hybridization technique can be an optimum solution from the point of view of cost reduction as well as enhancement of strength properties. The layer-wise stresses for the stiffened plate have been calculated in the present paper. A 3D polynomial curve fitting technique has been used to obtain higher accuracy and consistency in the computation of stresses. The computer code has been developed using MATLAB considering the plates as eight noded isoparametric plate bending element and the stiffener has been modeled as three noded isoparametric beam element. The stiffened panel has also been analysed using the ANSYS14.0 software package considering 2D model. The results obtained from the present formulation have been compared with those available in the published literature to validate the present formulation. The stiffened panels made of GFRP, CFRP and GFRP-CFRP hybrid laminates have been studied here. An extensive parametric study has been carried out with varying fibre content in the laminates.
DECISION SUPPORT SYSTEM FOR POWER GENERATION MANAGEMENT FOR AN 110000+ GRT CRUISE SHIP
Authors: Gualeni P , Boveri A , Silvestro F , Margarita A
Published: December 2021

The aim of this work is to provide a methodology for the power generation optimization on large cruise ships in order to improve their operating efficiency, fuel saving and, consequently, to reduce exhaust gas emissions. The electrical load analysis is compared to the machinery reports of actual data in order to investigate if the estimated required power is appropriately close to the real power demand. Relevance is given to the average load of the diesel-generators, which expresses an indication of how the generators work. The model of the ship electric distribution system represents one of the main objectives of this work along with the power system simulations. These were developed through the definition of load profiles, both by the onboard recordings and by machinery reports data. Therefore, the same cruise profile is analyzed under different scenarios, the real and the optimized one, in order to highlight the critical state of the system and any possible margin for improvement.
Cognitive disabilities and web accessibility: a survey into the Brazilian web development community
Authors: Pichiliani Talita Cristina Pagani Britto , Pizzolato Ednaldo Brigante
Published: December 2021

Cognitive disabilities include a diversity of conditions related to cognitive functions, such as reading, understanding, learning, solving problems, memorization and speaking. They differ largely from each other, making them a heterogeneous complex set of disabilities. Although the awareness about cognitive disabilities has been increasing in the last few years, it is still less than necessary compared to other disabilities. The need for an investigation about this issue is part of the agenda of the Challenge 2 (Accessibility and Digital Inclusion) from GranDIHC-Br. This paper describes the results of an online exploratory survey conducted with 105 web development professionals from different sectors to understand their knowledge and barriers regarding accessibility for people with cognitive disabilities. The results evidenced three biases that potentially prevent those professionals from approaching cogni-tive disabilities: strong organizational barriers; difficulty to understand user needs related to cognitive disabilities; a knowledge gap about web accessibility principles and guidelines. Our results confirmed that web development professionals are unaware about cognitive disabilities mostly by a lack of knowledge about them, even if they understand web accessibility in a technical level. Therefore, we suggest that applied research studies focus on how to fill this knowledge gap before providing tools, artifacts or frameworks.
Cerebral Vasospasm: Mechanisms, Pathomorphology, Diagnostics, Treatment
Authors: Alexandrovna Savvina Irina , Mikhailovna Zabrodskaya Yulia , Olegovna Petrova Anna , Alexandrovich Samochernykh Konstantin
Published: December 2021

Cerebral vessels constriction is one of the leading causes of mortality and disability in patients with acute cerebral circulatory disorders. The most dangerous type of acute cerebrovascular disease accompanied by high mortality is ruptured cerebral aneurysms with subarachnoidal hemorrhage (SAH). Following a constriction of the cerebral vessels on the background of SAH is the reason for brain ischemia. This chapter will focus on the mechanisms of formation of cerebral vascular spasm, pathomorphological aspects of the cerebral vessels constriction, and the stages of vascular spasm—the development of constrictive-stenotic arteriopathy, contractural degeneration of smooth muscle cells, and endothelial damage. We will cover classifications of cerebral vessels constriction by prevalence and severity, modern methods of clinical and instrumental diagnostics and treatment including paroxysmal sympathetic hyperactivity syndrome associated with the development of secondary complications, a longer stay of the patients in the ICU, higher disability and mortality.
Fast Computation of the EM Algorithm for Mixture Models
Authors: Kuroda Masahiro
Published: December 2021

Mixture models become increasingly popular due to their modeling flexibility and are applied to the clustering and classification of heterogeneous data. The EM algorithm is largely used for the maximum likelihood estimation of mixture models because the algorithm is stable in convergence and simple in implementation. Despite such advantages, it is pointed out that the EM algorithm is local and has slow convergence as the main drawback. To avoid the local convergence of the EM algorithm, multiple runs from several different initial values are usually used. Then the algorithm may take a large number of iterations and long computation time to find the maximum likelihood estimates. The speedup of computation of the EM algorithm is available for these problems. We give the algorithms to accelerate the convergence of the EM algorithm and apply them to mixture model estimation. Numerical experiments examine the performance of the acceleration algorithms in terms of the number of iterations and computation time.
Reinforcement of Montmorillonite Clay in Epoxy/Unsaturated Polyester Blended Composite: Effect on Composite Properties
Authors: V.P. Komanduri Chakradhar
Published: December 2021

Montmorillonite (MMT) clay was disseminated into Unsaturated Polyester (UP) and Epoxy blend systems in diverse weight ratios namely, 0, 1, 2, 3, and 5% to prepare Epoxy/UP/MMT clay composite. The specimen was characterized by thermal and chemical analysis. Homogeneous mixture of blended composites is obtained through mechanical stirring and ultrasonication processes. The testing of thermal and chemical properties was performed. Evidence acquired from the above tests indicate that Epoxy reinforced with UP and further strengthened with MMT clay enhanced the thermal and chemical properties of the composite to a considerable extent. The purpose of this study was to recognize an appropriate composite offering a stronger material with enhanced performance; that is suitable for diverse industrial uses.
Programy zlepšování kvality ovzduší – právní forma v průběhu času
Authors: Mrlina Matěj , Jančářová Ilona
Published: December 2021

Tento příspěvek se zabývá programy zlepšování kvality ovzduší jakožto koncepčními nástroji v oblasti ochrany ovzduší. Tento příspěvek má ambici rozebrat právní úpravu programů zlepšování kvality ovzduší v současně platné a předcházející legislativě upravující ochranu ovzduší, a to s ohledem na právní formy těchto koncepčních nástrojů stanovené jednotlivými právními předpisy, které v průběhu času programy zlepšování kvality ovzduší upravovaly. Cílem příspěvku je poukázat na některé problematické aspekty související s volbou právní formy pro tyto nástroje a jejich legislativní úpravou. Současně má také poukázat na možná interpretační a aplikační úskalí současně platné legislativy, a to na základě relevantní evropské legislativy, vývoje právní úpravy programů zlepšování kvality ovzduší a též relevantní judikatury českých soudů i Soudního dvora Evropské unie.
Psychological Skills in Relation to Academic Achievement through Swimming Context
Authors: Bayyat Manal M.
Published: December 2021

This study aimed to investigate: (1) the level of psychological skills among students enrolled in swimming courses at the Physical Education faculties in the Jordanian Universities. (2) the relation between their psychological skills and academic achievement. (3) the differences in these psychological skills according to gender. The descriptive approach was used to conduct this study. The study sample consisted of (260) male and female students enrolled in intermediate and advanced level swimming courses at the School of Sport Sciences/ University of Jordan. Students’ final academic achievement records in addition to the “Life skills through swimming context” scale was used to collect required data. The results of the statistical analysis revealed an average level of psychological skills, significant differences in psychological skills level in favor of female students, A level students, and JU students, and a positive significant relation between psychological skills and academic achievement. In conclusion, it is important to design comprehensive psychological skills-based study plans for swimming courses and in different sports fields. Also, to conduct specified training and guidance courses in this domain to improve psychological skills, teaching competencies, and academic achievement.
Covid-19 versus Physical Activity in the Context of University Students
Authors: Durdová Irena , Sekot Aleš
Published: December 2021

PURPOSE: The aim of the paper is to present the results of a recent research survey (February 2021) in a broader context of the issue to determine whether university students devote themselves as much as possible to specific sports and physical activities even at the time of the ongoing pandemic associated with the spread of COVID-19, i.e. at a time when the possibilities of sports and physical activities are limited, and the contact Physical Education lessons (hereinafter referred to as PE) are cancelled at schools.METHODS: To meet the objectives of the research survey, the method of questioning – an online questionnaire – was chosen. The total number of the university students who were addressed was 1164, 530 first-year students from all seven faculties of VSB – Technical University of Ostrava (hereinafter referred to as VSB-TUO) answered. The questionnaires were subjected to the statistical classification of the first-level data. Another method was the comparative method of working with documents, comparing with the results of comparable questionnaire surveys from 2015 and 2018, and relevant scientific discussion in this contestRESULTS: The results of the research confirmed that first-year students of all VSB-TUO faculties, who as graduates of the relevant secondary school could no longer complete the subject Physical Education due to pandemic measures, preferred unorganized physical activities in accordance with the situation, such as walks, including walking the dog. 34.8% of respondents answered that they “did not miss sport” or that they “were not interested in sport at all”. A high percentage of respondents (44.3%) admitted that they “did not miss” organized Physical Education lessons “at all”, while some (31.3%) stated that thanks to the subject Physical Education, they were able to play sports “at least once a week”.CONCLUSION: Due to the high number of interviewed first-year students of VSB-TUO, it can be assumed that we would reach similar results in a vast population of peers, and the findings can be generalized. The study summarizes the latest reflections on impersonal forms of teaching of Physical Education on the motivation and intensity of sports and physical activities within the general level of foreign surveys as well. Relevant research in our cultural setting coincidently conclude indispensable importance of growing role of regular physical activity in the field of school, family and leisure including its attractive innovation during lock down pandemic situation.
Match-fixing as a Threat to Sport: Ethical and Legal Perspectives
Authors: Mravec Ladislav
Published: December 2021

This article aims to show how match-fixing is a threat to sport, not only from an ethical but also from a legal perspective, and to explain the various challenges of combating match-fixing in sport on the national and international level. To achieve this, the first step of the article is to explain corruption in sport, the values of sport and their endangerment through match-fixing, and then the crucial factor of sport autonomy is explained. Further, the article discusses various national and international legal norms and measures in the fight against match-fixing. On the international level there is discussed the current state of play of the Council of Europe Convention on the Manipulation of Sports Competitions (the so-called Macolin Convention) and the Group of Copenhagen, as the follow-up network of national platforms. Finally, the article makes recommendations regarding the better investigation of match-fixing and concludes with a critical appreciation of findings in the fight against match-fixing.
Breathing as one of the components of biathlon shooting in youth biathletes
Authors: Žák Michal , Ondráček Jan
Published: December 2021

PURPOSE: This study is aimed at identifying the length of breath holding in youth biathletes before shooting in both the prone and the standing position, and determining potential dependence between breath holding and the shooting performance at rest and after physical load during the training period.METHODS: Twenty-one national youth biathletes, women (n = 10; 16.7 ± 0.7 years) and men (n = 11; 16.5 ± 0.6 years), participated in the study. All participants completed two series of measuring of breath holding after 3 months period during shooting at rest and after roller skiing in a race load, in the prone as well as the standing position. They shot using their own biathlon rifles with a fixed accelerometer and respiration belts on the thorax.RESULTS: The average length of breath holding when successfully hitting the target in the prone position was 0.65 seconds in average both at rest and in the racing load, with some significant differences both men and women. When shooting in the standing position, the average values were approximately same as in the prone position 0.65 seconds both at rest and in racing load, again with some observable differences both men and women. There were several significant differences between the pre-test and post-test in the length of breath holding in both groups (p < 0.05).CONCLUSIONS:The study evaluate the length of breath holding and determine dependence of breath holding on the shooting performance at rest and after physical load during the training period in youth biathletes. The comparison of the acquired information with the shooting methodology taught by the coaches brought beneficial results. The study showed that is appropriate to hold breath for an average of 0.55 - 0.7 seconds in both shooting positions for both men and women in this age category.
Long-Term Follow-up of Enhanced Holter-Electrocardiography Monitoring in Acute Ischemic Stroke
Authors: Wachter Rolf , Weber-Krüger Mark , Hamann Gerhard F. , Kermer Pawel , Liman Jan , Mende Meinhard , Seegers Joachim , Wasser Katrin , Gröschel Sonja , Uphaus Timo , Poppert Holger , Köhrmann Martin , Zabel Markus , Laufs Ulrich , Heuschmann Peter U. , Conen David , Gröschel Klaus ,   on Behalf of the Find-AFRANDOMISED Investigators and Coordinators
Published: December 2021

Background and Purpose Prolonged electrocardiography (ECG)-monitoring in stroke patients improves the detection of paroxysmal atrial fibrillation (pAF). However, most randomized studies only had short follow-up. We aimed to provide 3-year follow-up data for AF detection and stroke recurrence risk.Methods We randomized 402 patients aged ≥60 years with acute ischemic strokes without AF to either enhanced and prolonged monitoring (EPM; 3×10-day Holter-ECG-monitoring) or standard-of-care (≥24 hours ECG-monitoring). The endpoint of the current analysis was AF within 36 months analyzed by intention to treat. Long-term follow-up was performed for 36 months.Results Two hundred and seventy-four patients (80%) participated in the extended follow-up (median duration of follow-up was 36 months [interquartile range, 12 to 36]). During the first 6 months, more AF was documented in the EPM arm compared to the control arm (13.5% vs. 5.1%; 95% confidence interval, 2.9% to 14.4%; P=0.004). During months 6 to 36, AF was less detected in the EPM intervention arm than in the control arm (2.0% vs. 7.3%; 95% confidence interval, 0.7% to 9.9%; P=0.028). Overall, the detection rate of AF within 36 months was numerically higher within the EPM group (15.0% vs. 11.1%, P=0.30). Numerically less patients in the EPM arm had recurrent ischemic strokes (5.5% vs. 9.1%, P=0.18), transient ischemic attacks (3.0% vs. 4.5%, P=0.44) or died (4.5% vs. 6.6%, P=0.37).Conclusions Enhanced and prolonged ECG monitoring increased AF detection during the first six months, but there was significantly more clinical AF during months 6 to 36 observed in the usual-care arm. This suggests that EPM leads to an earlier detection of clinically relevant AF.
La acrópolis de Ategua. Nuevos datos arqueológicos sobre su origen y evolución histórica
Authors: Fuertes Santos M. C. , Borrego de la Paz J. D. , Carrasco Gómez I. , Jiménez Hernández A. , Romero Paredes C.
Published: December 2021

Se exponen en este trabajo los datos arqueológicos obtenidos tras varias obras de consolidación efectuadas sobre las estructuras excavadas durante los años 80 del siglo XX del edificio de la acrópolis. El uso de una metodología arqueológica correcta, utilizada durante el seguimiento del control de las obras, ha permitido acercarnos a la cronología de su construcción y a su evolución histórica.
Increased vegetation ground cover reduces water, sediment and phosphorus losses in Cambisol treated with swine slurry
Authors: Pessotto Patrícia Pretto , Gatiboni Luciano Colpo , Dall Orsoletta Daniel João , Mumbach Gilmar Luiz , Iochims Daniel Alexandre
Published: December 2021

This study aims to evaluate the influence of the ground cover rate by crop residues and the rain time elapsed after the application of liquid swine slurry (LSS) under losses of water, sediments, and phosphorus (P). The study was carried out under a Humic Cambisols. Two areas were delimited: with and without the application of LSS. Each area was subdivided into four levels of crop residues: 5%, 35%, 65%, and 95%. Vegetable residues present in the area, from corn and black oat, were used. Three collecting gutters of 0.60 m² were installed in each subplot. Simulated rain was carried out on these, and the runoff volume collected for quantification and determination of losses. With LSS application, increase in the cover rate by crop residues reduces 0.3 mm h-1 the runoff volume and 1.67 mg m-2 reactive soluble P (H2O-P). The sediment losses in the first collection after the beginning of the rain were 23 times lower in the soil with 95% ground cover than in the soil with 5% ground cover. The loss of total P (total-P) decreases with the increase of the ground cover of the soil and increases in the same way with the increase of the time.
Desenvolvimento de porta-enxerto de videira em consórcio com plantas de cobertura do solo
Authors: Queiroz Gustavo Reis Silva dos Santos , Vendruscolo Eduardo Pradi , Seron Cássio de Castro , Martins Murilo Battistuzi , Campos Luiz Fernandes Cardoso , Polo Gabriel Furlan , Zoz Tiago
Published: December 2021

A utilização de plantas de cobertura do solo, no cultivo da videira é uma técnica importante, principalmente para regiões de clima tropical devido às elevadas temperaturas do ar e do solo. Objetivou-se com este trabalho avaliar o desenvolvimento do cultivar de porta-enxerto de videira IAC 572 ‘Jales’, consorciado com diferentes plantas de cobertura do solo. O experimento foi conduzido em área experimental da Universidade Estadual do Mato Grosso do Sul - Unidade Universitária de Cassilândia. O delineamento experimental foi em blocos ao acaso, com cinco repetições de duas plantas do porta-enxerto, totalizando dez plantas úteis por tratamento. Os tratamentos foram definidos pelas plantas de cobertura: milheto (Pennisetum glaucum); crotolária (Crotalaria juncea); e mamona (Ricinus communis). Foram avaliadas a altura das plantas, diâmetro de caule, número de ramos e teor relativo de clorofila.  O desenvolvimento de porta-enxerto IAC 572 ‘Jales’, é favorecido pelo cultivo consorciado com crotalária e milheto na entrelinha de plantio, pois contribui para maior altura de plantas e maior teor relativo de clorofila. A utilização da cultura da mamona, em consórcio com o porta-enxerto, deve ser evitada. Tais resultados demonstram a importância de se conhecer a interação entre e espécie cultivada e as plantas de cobertura do solo.
Judgment day: Activating computational thinking activities with popular culture
Authors: Dousay Tonia
Published: December 2021

El interés como construcción de aprendizaje proporciona más que inspiración para la innovación. Dewey reconoció el papel del interés como una herramienta poderosa para involucrar a los estudiantes. Sin embargo, a pesar de los esfuerzos contemporáneos por estudiar el fenómeno, pocos diseños de aprendizaje reconocen este potencial. El presente artículo presenta un marco conceptual para la integración de la cultura popular en STEM, utilizando las competencias de pensamiento computacional como un mecanismo crítico y un contexto para la aplicación y las pruebas. El interés contribuye a la motivación a través de la autorregulación, y la autorregulación tiene el poder de mejorar el ciclo de logro e interés en el aprendizaje. A través de este marco, el Principio de activación de Merrill brinda orientación sobre por qué y cómo debemos atender este ciclo. Al evocar recuerdos positivos relacionados con los intereses del alumno, podemos mejorar otras etapas del aprendizaje desconectadas de la experiencia de aprendizaje inicial. Los educadores y académicos de STEM pueden usar este marco y diseñar y evaluar con confianza actividades de aprendizaje dirigidas al desarrollo del pensamiento computacional utilizando los medios y la cultura populares.

Finding a foundation in Dewey, interest is an underestimated and often overlooked aspect of learning design. Yet, situational interest in a learning experience has the power to contribute to motivation through self-regulation. Self-regulation, a learning metaskill, has the power to aid the cyclical cycle of learning achievement and interest, especially in STEM learning. Additionally, Merrill’s Activation Principle provides guidance on why and how we should attend to this cycle. Though interest appears occasionally as a consideration in learning design, two aspects of such an approach are lacking in the literature. First, few STEM-learning designs evaluate activation strategies. Second, sparse examples of attention on designing for interest in STEM learning reference using popular culture as a specific trigger. The current paper explores a conceptual framework for integrating popular culture into STEM, using computational thinking competencies as a critical mechanism and context for application and testing.
Considering How to Use First Principles of Instruction and Video Technologies to Support Teachers’ Professional Learning in Mathematics Education
Authors: Polly Drew , Recesso Art , Hannafin Michael J.
Published: December 2021

Los principales principios de instrucción de Merrill proporcionan un marco para el diseño de instrucción centrada en el alumno. En este artículo examinamos cómo esos Principios de Instrucción proporcionan un marco para examinar formas efectivas de aprovechar el uso de tecnologías de video para mejorar el diseño e implementar el aprendizaje profesional para los profesores de matemáticas. Sintetizamos los Primeros Principios de la Instrucción, el ciclo de lecciones Launch-Explore-Discuss en matemáticas (Polly, 2017b; Tools4NCTeachers, s.f.), y los principios del aprendizaje profesional centrado en el alumno (Polly y Hannafin, 2010). Luego describimos viñetas sobre cómo las tecnologías de video pueden mejorar las experiencias de aprendizaje profesional que se alinean con los Primeros Principios de Instrucción y el aprendizaje profesional centrado en el alumno. Cerramos con implicaciones y recomendaciones para la investigación y la práctica para futuros esfuerzos.

Merrill’s First Principles of Instruction provide a framework for the design of learner-centered instruction. In this article we examine how those Principles of Instruction provide a framework to examine effective ways to leverage the use of video technologies to enhance the design and implement professional learning for mathematics teachers. We synthesize the First Principles of Instruction, the Launch-Explore-Discuss lesson cycle in mathematics (Polly, 2017b; Tools4NCTeachers, n.d.), and principles of learner-centered professional learning (Polly & Hannafin, 2010). We then describe vignettes about how video technologies can enhance professional learning experiences that align to the First Principles of Instruction and learner-centered professional learning. We close with implications and recommendations for research and practice for future endeavors.
EMI and the Teaching of Cultural Studies in Higher Education: A Study Case.
Authors: Gómez Calderón María José
Published: December 2021

This paper examines students’ perspectives on the challenges raised by their first encounter with EMI pedagogy in higher education. The research was conducted with a group of beginner students with no previous experience in monolingual instruction in English. The case studied is based on two English Cultural Studies subject courses of the English Studies Program at a Spanish university and taught in a learning environment of total linguistic immersion. By activating their metacognitive and metalinguistic awareness, students were encouraged to take ownership of the stages of their learning process and assess it critically. Set at the intersection of EFL, ESP, and EAP, the specificities of these courses comprising linguistic and non-linguistic contents shed light on the teaching procedures employed in English Departments training programs, whose goals are to turn undergraduates into expert linguists and philologists and maximise their communicative proficiency in academic English.
How the Income Elasticity of Meat Consumption differs between social groups? A case of the UK and the Czech Republic
Authors: Špička Jindřich , Eastham Jane , Arltová Markéta
Published: December 2021

The purpose of the article is to show different consumer behaviour between ten different income levels (deciles) and different countries and to examine the elasticity distance between income deciles in the UK (a high-income country) and the Czech Republic (a low-income country) within the context of meat consumption. The official statistic services provided data in the Czech Republic (Czech Statistical Office, 2020) and the UK (Office for National Statistics, 2020). Data on the Czech Republic come from the household budget surveys (HBS). In contrast, corresponding data on UK consumers was drawn from the Living Costs and Food survey, which succeeded the National food survey and household expenditure survey. Both sets of data were set according to households’ structure from the EU-SILC Survey (national module of the European Union – Statistics on Income and Living Conditions). To estimate the income elasticity of meat in the Czech Republic and the United Kingdom in different consumer income groups, a time series cointegration analysis was applied to analyse the annual data for 2000-2017. The Törnquist equation and the difference between income elasticity in monetary and natural expression show saturation and preference of high quality meat in the higher-income consumers in the UK than the same groups in the Czech Republic and overall increasing demand for quality in other income groups. The results support the theory of nutrition transitions. The value of the research is that it would enable the exploration of the potential impact and nature of fiscal interventions for improving diets whilst enabling food producers to forecast meat consumption within the different customer segments.
Evidenze, miti e prassi didattiche: il caso dell’insegnamento della lettura nella scuola italiana
Authors: Calvani Antonio , Damiani Paola , Ventriglia Luciana
Published: December 2021

This paper aims to take stock of the acquisitions achieved by evidence-based research on teaching to read, to compare them with the teaching practices, as they emerge from the school textbooks proposed by the publishing houses in Italy. Moving from the importance recently assumed by scientific research on effective teaching and the need to avoid risks and misunderstandings that can be generated for its use in practice, the evidence acquired about the teaching of reading and writing is presented, recalling the need to focus on the grapheme-phoneme correspondence to be acquired by children in a progressive, systematic and explicit way. It is then pointed out that the textbooks in use propose approaches in clear contrast with this finding. The second part focuses on the experimental researches conducted in Italy in recent years, congruent with the framework previously indicated, which achieve better effectiveness and high motivation in all pupils. Particular attention is paid to the national research conducted recently by the Association S.Ap.I.E.
Conflicts in Schools: Causative Factors and Resolution Strategies
Authors: Rai Kathryn , Singh Rajinder
Published: December 2021

This paper is an effort in reviewing and assembling the research findings of different researchers on the factors that cause conflicts in schools and the strategies adopted by schools for conflict resolution. The research is limited to certain databases only. The basis for selecting relevant literature for this study is their accessibility, language (English) and relevancy to the topic and only those research papers that highlight teacher-teacher conflicts and teacher-administration conflicts have been selected. The several factors that emerged from the study were classified as Structural and Personal factors only. The originality of this paper rests in an attempt to attract the attention of the research community towards the factors that lead to conflicts in schools and an insight into the strategies used by the school administration to resolve them. This study also recommends that school administrators be trained to identify at least some factors responsible for conflicts among their staff, even among the students of the school so that they can resolve it in a better way.
L’affidamento familiare: le strategie educative elaborate dagli affidatari
Authors: Ricchiardi Paola , Coggi Cristina
Published: December 2021

Foster care is a condition of welcoming children with families in serious difficulty, legally regulated, aimed at guaranteeing to minors a suitable space for growth, and to families of origin the possibility of overcoming the problems so as to consent the return of the children. It is a challenging educational condition, to be deepened with research. The complexity of the backgrounds of origin and the co-presence of multiple risk factors in fact generate in children and young people in foster care, important difficulties in development, which foster families have to cope with, also with the support of specialists, services and associations. However, the skills that caregivers come to build over the years are valuable, deserving of pedagogical insights, so that good practices of positive parenting can be valued and shared. In this paper we will report the results of a survey, carried out with a national sample of 323 foster families. The study makes it possible to investigate the reasons for the custody prevision, the relationships with families of origin, the difficult life trajectories of the children in foster care (transitions, placements, discontinuities, years of foster care, continuation of relationships after foster care). In this way it is possible to identify the needs highlighted by the minors, the relevant problems that emerge and the promising strategies adopted by the foster families.
Criterion Validation of the Scales of Autonomy, Collaboration, Empathy, Problem-solving and Self-confidence of the 3SQ. Soft Skills Self-evaluation Questionnaire Adapted for Lower Secondary School
Authors: Scippo Stefano , Rubat du Mérac Emiliane
Published: December 2021

The Soft Skills Self-evaluation Questionnaire (3SQ, 41 items) was validated using the responses of 1216 Italian students attending the fourth and the fifth grade of upper secondary school (Lucisano & du Mérac, 2019a), demonstrating good psychometric properties (du Mérac & De Santis, 2020; du Mérac, Livi, & Lucisano, 2020). The adaptation of the 3SQ (40 items) for 8th-grade students was validated in Rome using the responses of 507 students, confirming the factorial structure, sufficient independence, and a good internal consistency (Cronbach alpha between .75 and .92 and 52.23% of the total variance explained). Here, we present the criterion-related validity of the five scales of the adapted 3SQ: Self-confidence, Autonomy, Problem-solving, Cooperation, Empathy. During a PhD research project (Scippo, 2021), these dimensions were also measured in Rome with other instruments, using a sample of 403 8th grade students. The analysis of the data confirms good reliability of the five scales (between .79 and .92), shows good indices of the confirmatory factor analysis of all the scales (RMSEA = .05, SRMR = .08), and reveals significant correlations (between .38 and .68) between the scales of the adapted 3SQ and the other scales measuring the same dimensions. In conclusion, this concurrent validity check reinforces the validity of the adapted 3SQ construct and, consequently, its usefulness for both research and guidance.
Synaptic targets of photoreceptors specialized to detect color and skylight polarization in Drosophila
Authors: Kind Emil , Longden Kit D , Nern Aljoscha , Zhao Arthur , Sancer Gizem , Flynn Miriam A , Laughland Connor W , Gezahegn Bruck , Ludwig Henrique DF , Thomson Alex G , Obrusnik Tessa , Alarcón Paula G , Dionne Heather , Bock Davi D , Rubin Gerald M , Reiser Michael B , Wernet Mathias F
Published: December 2021

Color and polarization provide complementary information about the world and are detected by specialized photoreceptors. However, the downstream neural circuits that process these distinct modalities are incompletely understood in any animal. Using electron microscopy, we have systematically reconstructed the synaptic targets of the photoreceptors specialized to detect color and skylight polarization in Drosophila, and we have used light microscopy to confirm many of our findings. We identified known and novel downstream targets that are selective for different wavelengths or polarized light, and followed their projections to other areas in the optic lobes and the central brain. Our results revealed many synapses along the photoreceptor axons between brain regions, new pathways in the optic lobes, and spatially segregated projections to central brain regions. Strikingly, photoreceptors in the polarization-sensitive dorsal rim area target fewer cell types, and lack strong connections to the lobula, a neuropil involved in color processing. Our reconstruction identifies shared wiring and modality-specific specializations for color and polarization vision, and provides a comprehensive view of the first steps of the pathways processing color and polarized light inputs.
Excitatory neurotransmission activates compartmentalized calcium transients in Müller glia without affecting lateral process motility
Authors: Tworig Joshua M , Coate Chandler J , Feller Marla B
Published: December 2021

Neural activity has been implicated in the motility and outgrowth of glial cell processes throughout the central nervous system. Here, we explore this phenomenon in Müller glia, which are specialized radial astroglia that are the predominant glial type of the vertebrate retina. Müller glia extend fine filopodia-like processes into retinal synaptic layers, in similar fashion to brain astrocytes and radial glia that exhibit perisynaptic processes. Using two-photon volumetric imaging, we found that during the second postnatal week, Müller glial processes were highly dynamic, with rapid extensions and retractions that were mediated by cytoskeletal rearrangements. During this same stage of development, retinal waves led to increases in cytosolic calcium within Müller glial lateral processes and stalks. These regions comprised distinct calcium compartments, distinguished by variable participation in waves, timing, and sensitivity to an M1 muscarinic acetylcholine receptor antagonist. However, we found that motility of lateral processes was unaffected by the presence of pharmacological agents that enhanced or blocked wave-associated calcium transients. Finally, we found that mice lacking normal cholinergic waves in the first postnatal week also exhibited normal Müller glial process morphology. Hence, outgrowth of Müller glial lateral processes into synaptic layers is determined by factors that are independent of neuronal activity.
Cooperative Learning within Educational Networks: Perspectives for Good Educational Governance in Modern Reading Education
Authors: Marci-Boehncke Gudrun
Published: December 2021

German schools, universities, and libraries haven’t established a teaching and cooperation practice that uses the potential of a convergent and participatory culture (Jenkins 2006, 2009). Schools and libraries have to collaborate more closely using the digital networks and language of the students of today. Although official references, such as the report of the EU High-Level Group of Experts on Literacy (2012), postulate joint efforts with the objective of promoting reading and media education by different educational and non-educational institutions, at least in Germany this is currently still not a collaborative educational practice. One reason for this might be a missing link in local educational governance. Furthermore, the professional self-image of teachers and librarians, as well as the image of the cooperation partner, may limit effective public cooperation. This contribution starts (1) with an outline of the demands in the field of digital literacy and participatory culture, followed by (2) a discussion about the chances and potentials of partnerships between schools and public libraries, their specific interests, and potential. Finally, (3) problems and principles of good educational governance within those networks are identified and developed to excavate the potential, especially for academic teaching and students’ practice. The article is based on empirical data as well as participatory observation of the three-years teacher training and the seven years of on-the-job-training of librarians of public libraries (“Experten für das Lesen”).
Gamification of Learning and Teaching in Schools – A Critical Stance
Authors: Buck Marc Fabian
Published: December 2021

The ongoing transformation of learning and teaching is one facet of the progressing digitalization of all aspects of life. Gamification’s aim is to change learning for the better by making use of the motivating effects of (digital) games and elements typical of games, like experience points, levelling, quests, rankings etc. Especially in the light of the success of Pokémon Go, multiple actors call for gamification of learning and teaching in schools as means for motivating students.From the perspective I introduce in this paper, gamification shows itself as reversion from serious pedagogical and didactical endeavours. This threatens to lead to the replacement of teaching by gamification and the (self) degradation of teachers to support personnel. In this paper, I argue that gamified learning and teaching suspends the fundamental, subversive, and critical moments only schools can offer. Furthermore, it can lead to subjugation and isolation of students due to its inherent closed and enclosing structure. I further show how the line of argumentation of gamification advocates iterates that of progressive education.
A user experience case study: two embodied cognition user interface solutions for a math learning game
Authors: Lindstedt Antero , Kiili Kristian , Tuomi Pauliina , Perttula Arttu
Published: December 2021

Game-based learning solutions provide possibilities to teach conceptual number knowledge in engaging ways. The evaluation of user experience and error-proneness of the user interface are crucial in the educational game development process and game-based assessment. In the present study, we investigated how two different user interfaces of the rational number game, Semideus, influenced the game character controlling accuracy and user experience. Two user interfaces varying in the intensity of physical activities needed for controlling the game character were compared. Thirty-six university students played both Semideus game versions for 20 minutes in randomized order.  In order to compare the tilting (low physical intensity) and walking (high physical intensity) user interfaces we used stealth assessment as an objective measure of controlling accuracy as well as flow experience and playability questionnaires as subjective measures of user experience. The results revealed that there was no significant difference in game controlling accuracy between the user interface solutions, suggesting that the intensity of the physical activities did not influence the error-proneness. However, the subjective measures indicated that students appreciated the tilting user interface significantly more than the walking user interface. Implications of the findings for future research and further development of the Semideus game are discussed.