bluuebunny/crossref_metadata_2025 huggingface dataset:
Challenging the Levels: The Catholic Church as a Multi-Level Actor in the Transition to a Climate-Compatible Society
Authors: Ostheimer Jochen , Blanc Julia
Published: March 2021

Climate compatibility is a cornerstone in the ecological transformation of modern society. In order to achieve sustainable development in all areas of society, numerous social actors must participate. This article examines the potential for the Catholic Church in German-speaking countries to contribute to such change. To this end, in contrast to most current studies, the Church is conceptualized as a multi-level actor instead of focusing only on the top of the hierarchy. Case studies are used to explore how various Church actors in different fields of social action evoke ecological awareness among members and non-members alike or participate in changing social structures.
On-Site Experimental and Numerical Investigations of Latticed Girder Composite Slabs
Authors: Zhang Xuefeng , Zhu Xiaodan , Xie Zhongshu , Yang Yang , Liang Shixue
Published: March 2021

In this study, on-site bending experiments which represented realistic and pragmatic engineering applications were performed to investigate the resistance, deflection, and cracking process of latticed girder composite slabs. Then, utilizing ABAQUS software, nonlinear finite element (FE) models were established to investigate the behavior of the slabs. The modeling took into account the contact between the precast and cast-in-place concrete interfaces. Additionally, a damage-cracking methodology was introduced to evaluate the crack opening width of the slab. The results demonstrated that the proposed numerical model was capable of reproducing the typical behavior of the composite slabs’ performance analysis. The experimental and numerical results demonstrate that the lattice girder composite slabs conformed to the requirement of existing design codes.
Quantitative Analysis of Waiting Length and Waiting Time for Frame Construction Work Activities Using a Queue Model; Focusing on Korean Apartment Construction
Authors: Kim Jin-Won , Ham Namhyuk , Kim Jae-Jun
Published: March 2021

The frame construction of an apartment complex that consists of multiple buildings encounters various uncertainties, owing to the complex relationships between units of work. Currently, the period of such a construction is calculated based on the number of floors of the highest building in the complex. This study quantitatively analyzes an apartment frame construction period using a queue model and evaluates the validity of the estimated period. In this regard, a methodology is proposed for analyzing the construction period by applying the concept of a customer and a server. A case study on the duration of an apartment frame construction period is conducted with the Korea Land and Housing Corporation, which has supplied the largest number of apartments in South Korea. It was found that the stable state of a queue system was observed when the rate of server utilization was applied to the basement and above-ground floors. However, a stable state was not reached on the ground floor. This study includes non-working days in its calculation and quantitatively analyzes uncertainty factors during construction. Therefore, the findings can be practically utilized to quantitatively plan the durations of work units in an apartment frame construction.
A Postcapitalistic People? Examining the Millennial Generation’s Economic Philosophies and Practices
Authors: Zachara-Szymańska Małgorzata
Published: March 2021

This article investigates the economic orientations of the members of the Millennial generation, so as to assess possible shifts towards their adoption of degrowth philosophy and practice. The text provides a general literature review oriented towards indicating the link between the Millennial generation’s economic standpoints and possible directions of evolution of the economic system in the Western world. An orientation towards the market and its economic system has become one of the distinctive features embedded in the portrait of the Millennials, who not only create the dominant social force of the Western world but also represent the first generation in which the majority question well-established market philosophies. The article considers the potential contribution of the Millennial generation to the further development of alternatives to traditional notions of growth. Until now, the evolution of the economic framework has been pushed forward mainly by policymakers and government representatives. System designers have shaped the desired outcomes via international agreements, internal policies, and the empowerment of different economic actors, driven by a belief in the long-term benefits of the capitalism–democracy nexus. However, this moment in history, in which such principles are being seriously questioned, creates a space for bottom-up processes and the reconfiguration of economic realities with a potentially transformative effect on the whole framework.
COVID-19 in Management Studies: A Systematic Literature Review
Authors: Piccarozzi Michela , Silvestri Cecilia , Morganti Patrizio
Published: March 2021

In 2020, the whole world had to face a pandemic with inevitable profound changes in all aspects of life, from the social to the economic sphere. The profound economic crisis that followed the rise of the pandemic has pushed firms and researchers to question the necessary changes and new challenges for the survival of businesses. In this scenario, the aim of the paper is to analyze and classify the main contributions published on the topic of COVID-19 in managerial literature, seeking to discover the perspective and the gaps and outline future avenues of research. A systematic review of the literature has been performed. The results highlight the orientation of studies in this field and the various links between different aspects that emerged. Limitations and implications complete the research.
Developing a Business Case for a Renewable Energy Community in a Public Housing Settlement in Greece—The Case of a Student Housing and Its Challenges, Prospects and Barriers
Authors: Botsaris Pantelis N. , Giourka Paraskevi , Papatsounis Adamantios , Dimitriadou Paraskevi , Goitia-Zabaleta Nerea , Patsonakis Christos
Published: March 2021

Democritus University of Thrace (DUTh) has formed, under the European Project Renaissance (Renewable Integration & Sustainability in Energy Communities, HORIZON 2020, GA 824342), a virtual Renewable Energy Community (REC) in Greece located nearby Kimmeria at the northeast of the city of Xanthi, at the North-eastern Greece. The REC formed is the first energy community designed in a public housing settlement in Greece and its members are: (a) the Democritus University of Thrace, (b) the Municipality of Xanthi and (c) a local industry. DUTh’s main objective is to explore, leverage and mobilize stakeholders to apply schemes for a social group of end users (i.e., students from low-income families) in order to participate in the operation and management of a local renewable energy community, gaining also non-financial benefits. This paper presents the business case scenario and the market players evolving at an Energy Community which includes a public establishment of student residences in Greece.
Intelligent Detection of False Information in Arabic Tweets Utilizing Hybrid Harris Hawks Based Feature Selection and Machine Learning Models
Authors: Thaher Thaer , Saheb Mahmoud , Turabieh Hamza , Chantar Hamouda
Published: March 2021

Fake or false information on social media platforms is a significant challenge that leads to deliberately misleading users due to the inclusion of rumors, propaganda, or deceptive information about a person, organization, or service. Twitter is one of the most widely used social media platforms, especially in the Arab region, where the number of users is steadily increasing, accompanied by an increase in the rate of fake news. This drew the attention of researchers to provide a safe online environment free of misleading information. This paper aims to propose a smart classification model for the early detection of fake news in Arabic tweets utilizing Natural Language Processing (NLP) techniques, Machine Learning (ML) models, and Harris Hawks Optimizer (HHO) as a wrapper-based feature selection approach. Arabic Twitter corpus composed of 1862 previously annotated tweets was utilized by this research to assess the efficiency of the proposed model. The Bag of Words (BoW) model is utilized using different term-weighting schemes for feature extraction. Eight well-known learning algorithms are investigated with varying combinations of features, including user-profile, content-based, and words-features. Reported results showed that the Logistic Regression (LR) with Term Frequency-Inverse Document Frequency (TF-IDF) model scores the best rank. Moreover, feature selection based on the binary HHO algorithm plays a vital role in reducing dimensionality, thereby enhancing the learning model’s performance for fake news detection. Interestingly, the proposed BHHO-LR model can yield a better enhancement of 5% compared with previous works on the same dataset.
A Generic Model for Identifying QoS Parameters Interrelations in Cloud Services Selection Ontology during Runtime
Authors: Rajendiran Babu , Kanniappan Jayashree
Published: March 2021

Nowadays, many business organizations are operating on the cloud environment in order to diminish their operating costs and to select the best service from many cloud providers. The increasing number of Cloud Services available on the market encourages the cloud consumer to be conscious in selecting the most apt Cloud Service Provider that satisfies functionality, as well as QoS parameters. Many disciplines of computer-based applications use standardized ontology to represent information in their fields that indicate the necessity of an ontology-based representation. The proposed generic model can help service consumers to identify QoS parameters interrelations in the cloud services selection ontology during run-time, and for service providers to enhance their business by interpreting the various relations. The ontology has been developed using the intended attributes of QoS from various service providers. A generic model has been developed and it is tested with the developed ontology.
Vibration Analysis and Parameter Optimization of the Longitudinal Axial Flow Threshing Cylinder
Authors: Wang Jinwu , Xu Changsu , Xu Yanan , Qi Xin , Liu Ziming , Tang Han
Published: March 2021

The longitudinal axial flow threshing cylinder of the full feeding rice combine harvester is widely used in China and works with violent vibration. To explore the source of the excitation affecting the vibration and to reduce the vibration, a finite element modal analysis and multipoint input and multipoint output (MIMO) modal test were performed to solve the natural vibration characteristics. By analyzing the excitation frequency, we concluded that the main reason for the resonance was the coupling between the rotation frequency of the threshing cylinder and the first natural frequency. To avoid the influence of resonance and realize a lightweight design, we proposed a combination of size optimization and topology optimization. The second rotation orthogonal combination test was designed to analyze the first natural frequency, maximum stress, and maximum deformation of the threshing cylinder, and the threshing cylinder was reconstructed as a central symmetrical structure to balance the rotational inertia force. The field experiment results showed that the amplitudes of the optimized threshing cylinder were significantly lower than those of the original threshing cylinder. This study provides ideas for solving the vibration characteristics of rotating parts and provides an important reference for the design of vibration reduction and weight reduction of key parts in the field of agricultural machinery.
A Strong Seasonality Pattern for Covid-19 Incidence Rates Modulated by UV Radiation Levels
Authors: Karapiperis Christos , Kouklis Panos , Papastratos Stelios , Chasapi Anastasia , Danchin Antoine , Angelis Lefteris , Ouzounis Christos A.
Published: March 2021

The Covid-19 pandemic has required nonpharmaceutical interventions, primarily physical distancing, personal hygiene and face mask use, to limit community transmission, irrespective of seasons. In fact, the seasonality attributes of this pandemic remain one of its biggest unknowns. Early studies based on past experience from respiratory diseases focused on temperature or humidity, with disappointing results. Our hypothesis that ultraviolet (UV) radiation levels might be a factor and a more appropriate parameter has emerged as an alternative to assess seasonality and exploit it for public health policies. Using geographical, socioeconomic and epidemiological criteria, we selected twelve North-equatorial-South countries with similar characteristics. We then obtained UV levels, mobility and Covid-19 daily incidence rates for nearly the entire 2020. Using machine learning, we demonstrated that UV radiation strongly associated with incidence rates, more so than mobility did, indicating that UV is a key seasonality indicator for Covid-19, irrespective of the initial conditions of the epidemic. Our findings can inform the implementation of public health emergency measures, partly based on seasons in the Northern and Southern Hemispheres, as the pandemic unfolds into 2021.
Serious Notifications on Food Contact Materials in the EU RASFF
Authors: Papapanagiotou Elias P.
Published: March 2021

Serious alert and border rejection notifications on food contact materials (FCM) retrieved from the RASFF database were analyzed for the first time regarding the period 2012–2019. The findings indicate that China was the main transgressor country for both types of notifications. Official controls were responsible for most FCM serious alerts (91.78%), and border rejection (90.82%) notifications. Another novelty proposed herein, is the criterion for “lag phases” (time from sampling to notification dates). Overall percentage distributions of lag phases, for all RASFF Member States, for the intervals of 0–50 days and 51–≥101 days, were 25.09% and 67.87% for serious alert notifications and 65.21% and 29.34% for serious border rejection notifications. Differences in percent shares of lag phase intervals were observed between the top-four notifying countries, indicating a lack of harmonization in timely reporting of serious alert and border rejection notifications for FCM. Migration of primary aromatic amines and of metals were the most frequently notified hazards overall in the period of analysis. A decreasing trend is observed in the two more recent biannual averages of serious alert notifications for primary aromatic amines and metals, while decreasing for metals but increasing for primary aromatic amines in serious border rejection notifications.
Water Temperature Simulation in a Tropical Lake in South China
Authors: Gu Hongbin , Lu Baohong , Qi Changjun , Xiong Si , Shen Wenlong , Ma Lejun
Published: March 2021

To study the vertical water temperature structure and thermodynamic characteristics of tropical lake-like reservoirs, a water temperature model was developed by a vertical one-dimensional numerical model for Songtao Reservoir in Hainan Province, China. The model was verified by the measured water temperature data, and sensitivity analysis of key model parameters was carried out. The results show that water temperature simulated by the model in Songtao Reservoir agreed with the observations quite well, and the model is feasible for water temperature simulations in large reservoirs in tropical zones. The sensitivity of vertical water temperature structure to different model parameters varied. For example, the extinction coefficient greatly affected surface water temperature, which is important for the formation and development of the surface water temperature hybrid layer. The vertical mixing coefficient significantly influenced the inflection point position and thickness of the thermocline. The vertical water temperature structure in Songtao Reservoir was stratified. Reservoir surface water temperature varied from 19.4 °C to 33.8 °C throughout a year. The hypolimnion mainly appeared in elevation below 150 m, where the water temperature is basically maintained at 19 °C throughout the year. This study also found that the surface water temperature of Songtao Reservoir in the tropical zone was higher than the air temperature throughout a year, with an annual average of 3.5 °C higher than that of air temperature. The preliminary analysis found out that the higher surface water temperature may be caused by the strong air temperature and solar radiation in tropical zones, in addition to the enhanced capacity of heat absorption and heat storage due to the slow water flow in the reservoir.
Distribution of the Macrophyte Communities in the Danube Reflects River Serial Discontinuity
Authors: Janauer Georg , Exler Norbert , Anačkov Goran , Barta Veronika , Berczik Árpád , Boža Pal , Dinka Mária , Georgiev Valeri , Germ Mateja , Holcar Matej , Hrivnák Richard , Igić Ružica , Ozimec Siniša , Sârbu Anca , Schmidt Brigitte , Schmidt-Mumm Udo , Schütz Wolfgang , Sipos Katalin , Szalma Elemér , Topić Jasenka , Tsoneva Sonya , Valachovič Milan , Valchev Vladimir , Vukov Dragana , Zelnik Igor , Gaberščik Alenka
Published: March 2021

The Danube is the second-longest river in Europe that is subjected to various man-made alterations, including those related to hydro-power plants. We surveyed and analyzed the presence and abundance of macrophytes in the main channel from 2582 river kilometers (rkm) to 171 rkm. We also assessed selected habitat parameters in the sampled river stretches. Sixty-eight different plant species were recorded along the entire course. Among neophytes, we found Elodea nuttallii, E. canadensis, Vallisneriaspiralis and Azolla filiculoides. Based on similarity analysis, we distinguished 15 plant communities, most of which were defined as associations, which were classified into 5 alliances and represented three vegetation classes, namely vegetation of rooted hydrophytes Potamogetonetea, the vegetation of pleustophytes Lemnetea and vegetation of marshes Phragmitetea. The number and abundance of plant species, as well as plant communities recorded in single stretches, varied along the course. Canonical correspondence analysis (CCA) revealed that environmental parameters explained 21% of plant species composition. CCA runs with neophytes explained 41% of the variance, and current velocity, water transparency, species number and bank structure were significant variables. The present study revealed that the free-running sections of the river are poor in number and abundance of plant species, whereas impounded reaches mainly show an opposite result.
Modeling Flood Peak Discharge Caused by Overtopping Failure of a Landslide Dam
Authors: Ruan Hechun , Chen Huayong , Wang Tao , Chen Jiangang , Li Huibin
Published: March 2021

Overtopping failure often occurs in landslide dams, resulting in the formation of strong destructive floods. As an important hydraulic parameter to describe floods, the peak discharge often determines the downstream disaster degree. Based on 67 groups of landslide dam overtopping failure cases all over the world, this paper constructs the calculation model for peak discharge of landslide dam failure. The model considers the influence of dam erodibility, breach shape, dam shape and reservoir capacity on the peak discharge. Finally, the model is compared with the existing models. The results show that the new model has a higher accuracy than the existing models and the simulation accuracy of the two outburst peak discharges of Baige dammed lake in Jinsha River (10 October 2018 and 3 November 2018) is higher (the relative error is 0.73% and 6.68%, respectively), because the model in this study considers more parameters (the breach shape, the landslide dam erodibility) than the existing models. The research results can provide an important reference for formulating accurate and effective disaster prevention and mitigation measures for such disasters.
Grazing Effects on Bovine-Associated and Background Fecal Indicator Bacteria Levels in Edge-of-Field Runoff
Authors: Wagner Kevin , Gentry Terry , Harmel R. , Pope Emily , Redmon Larry
Published: March 2021

Excessive levels of fecal indicator bacteria are a major cause of water quality impairment. Grazing and its management may significantly impact bacteria concentrations; however, other sources can contribute to water quality issues both in the presence and absence of cattle, thus confounding results. In this study, we utilize Bacteroides markers to evaluate bacteria loading from cattle versus background sources in runoff from rotationally grazed and ungrazed pastures and how grazing management, timing of runoff in relation to grazing events, and stocking rate affect Bacteroides marker (AllBac and BoBac) levels and ratios and their relation to E. coli concentrations in runoff at the small watershed scale. The data suggest that the AllBac and BoBac levels were not significantly impacted by grazing management or stocking rate; however, the timing of runoff events in relation to grazing events significantly impacted the levels of these markers found in runoff. Furthermore, the BoBac/AllBac ratio confirmed that fecal contamination present in runoff when sites were destocked for over two weeks largely originated from sources other than cattle. Thus, the magnitude and proportion of cattle impacts on fecal indicator bacteria in edge-of-field runoff were dramatically reduced shortly after de-stocking. However, background sources continued to contribute significant concentrations of E. coli.
Thickening and Storage of Sewage Sludge Contribute to the Degradation of LAS and EOX and the Humification of Organic Matter
Authors: Khakbaz Ali , Goi Daniele , Bravo Carlo , Contin Marco
Published: March 2021

Land application of sewage sludge on agricultural soils can be sustainable only if pollutant contents and organic matter quality meet the requirements imposed by minimization of environmental risks. This study investigated the degradation of linear alkylbenzene sulfonates (LAS) and extractable organic halogens (EOX) and the formation of humic substances (HS) during the thickening and storage phases of sewage sludge treatment. Changes in spectroscopic properties (UV-Vis, FT-IR, and excitation-emission matrix (EEM) fluorescence) of HS were also evaluated to assess the occurrence of biological activities during these curing phases of sewage sludge (SS). Humic acids (HA), fulvic acids (FA), EOX, and LAS were extracted from sewage sludge sampled from four municipal wastewater treatment plants of different size and treatment sequence, before and after 90 days of aerobic or anaerobic storage. During storage, the loss of organic C in the SS ranged from almost null to 31%. No significant changes of FA were registered, whereas HA increased in almost all samples, up to 30%. The amount of humic substances synthesized during storage correlated with the percentage of C lost. Spectroscopic changes of FA and HA showed an increase in their aromaticity, with a corresponding decrease in the aliphatic contribution. These changes show the improved agronomical quality of SS. LAS decreased during storage up to 30%, surprisingly more under anaerobic than aerobic conditions, whereas EOX decreased significantly in all samples, even up to 81%. In conclusion, although storage may be normally considered not influencing the quality of SS, their organic matter quality improved and contamination decreased during 90 days of storage, whatever the conditions of oxygen availability applied.
Stomalı Hastaların Yaşam Kalitesi Ve Öz Yeterlilik Düzeylerinin Belirlenmesi
Authors: YAŞAR Zekiye , ÜSTÜNDAĞ Hülya
Published: March 2021

Giriş ve Amaç: Bu çalışma stomalı hastaların yaşam kalitesinin ve öz yeterlilik düzeylerinin belirlenmesi amacıyla yapıldı. Gereç ve Yöntem Tanımlayıcı tipte olan araştırmanın örneklemini Ocak-Eylül 2018 tarihleri arasında bir üniversite hastanesinin genel cerrahi ana bilim dalı ve Stomaterapi ünitesinde takip edilen 195 hasta oluşturdu. Araştırma verileri literatür doğrultusunda araştırmacılar tarafından hazırlanan Hasta Bilgi Formu, Umut Merkezi Ostomi Yaşam Kalitesi Ölçeği (UM-OYKÖ), Genel Öz Yeterlilik Ölçeği (GÖYÖ) kullanılarak toplandı. Veriler, yüzdelik, ortalama, standart sapma, student t-testi ve ANOVA testi, Pearson Korelasyon testi ile analiz edildi. Bulgular: Hastaların yaş ortalaması 58.12±11.09 olup, %61,5’i erkektir. Umut merkezi ostomi yaşam kalitesi ölçeği toplam puan ortalaması 262,12±49,05 olarak belirlendi. Ölçeğin alt boyutlarından en yüksek ve en düşük puan ortalaması fiziksel iyilik 72,34±15,70 ve manevi iyilik hali 48,95±8,84, olduğu görüldü. Genel öz yeterlilik ölçeği toplam puan ortalaması 30,36±7,80 dir. Umut merkezi ostomi yaşam kalitesi ölçeği toplam puanı ile stomalı hastaların cinsiyet (p=0,012), medeni durum (p=0,001), eğitim durumu (p=0,000), stoma bakımını kendisi yapması (p=0,000) ve komplikasyon gelişme durumu (p=0,014) arasında anlamlı fark olduğu saptandı. Genel öz yeterlilik ölçeği toplam puanı ile stomalı hastaların medeni durumları (p=0,027), eğitim durumu (p= 0,018), stoma bakımını kendisi yapması (p= 0,000), arasında anlamlı fark olduğu saptandı. Stomalı hastaların, genel öz yeterlilik ölçeği toplam puanı ile umut merkezi ostomi yaşam kalitesi ölçeği toplam puanı ve tüm alt boyutları arasında ileri derecede anlamlı pozitif korelasyon saptandı. Sonuç: Stoma bakım hemşireleri bireye özgü hemşirelik bakımı planlarken, yaşam kalitesini ve öz-yeterliliğini olumsuz etkileyen faktörleri dikkate almalıdırlar.
Współczucie wobec samego siebie. Przegląd badań
Authors: Weryszko Małgorzata
Published: March 2021

Współczucie kojarzy nam się najczęściej jako ustosunkowanie do drugiej osoby, doświadczającej cierpienia, trudu, czy przeciwności. Tymczasem, od niedawna, psychologia wskazuje, że taka postawa warta jest również odniesienia do samego siebie. Współczucie względem siebie okazuje się być zdrowym ustosunkowaniem wobec własnej osoby, nieobciążonym negatywnymi konsekwencjami, jakie może nieść m.in. wysoka samoocena. Artykuł przedstawia opis tego konstruktu, wskazuje różnice między samowspółczuciem a użalaniem się nad sobą i samooceną. Zestawia przeprowadzone dotąd badania korelacyjne współczucia do samego siebie i ukazuje jego związki z takimi zmiennymi psychologicznymi jak cechy osobowości, adaptacyjne funkcjonowanie, postrzeganie swojego ciała czy pełnienie roli rodzicielskiej.
CUTTING MODE CONTROL MODULE FOR USE WITH STANDARD CNC EQUIPMENT
Authors: Frolov E. M. , Rogachev A. V.
Published: March 2021

The article offers a methodological and algorithmic base of the control module for turning modes for the serial equipment with CNC. The created model of the proposed cyberphysical system based on the Okuma Genos L300M turning processing center is described.
DEVELOPMENT AND RESEARCH OF THE AUTOMATED LABORATORY STAND BASED ON THE PROTOTYPE OF THE INDUSTRIAL ROBOT «SCARA»
Authors: Dyachenko E. A. , Kozenko M. Y. , Salnikov R. M. , Makarov A. M.
Published: March 2021

Experimental development and manufacture of a SCARA-robot prototype for further use in laboratory stands is underway. The description of the experimental prototype, the control principle and the analysis of the results are given.
DEVELOPMENT OF A NEURAL NETWORK FOR DETERMINING THE CAVITATION STOCK OF PUMPING UNITS
Authors: Repnikov A. I. , Serdobintsev Yu. P. , Kukhtik M. P.
Published: March 2021

An automated emergency prevention system for the water supply system based on a neural network has been developed. The training sample is collected and loaded into the neural network. The algorithm of the neural network is developed and described. The constructed neural network protects the pumping equipment from cavitation.
DEVELOPMENT AND STUDY OF SOLUTION UNIT FOR AUTOMATED AEROPONICS GROWING PLANT
Authors: Sharipov R. R. , Kotelnikov G. V. , Volko I. V. , Makarov A. M.
Published: March 2021

Research and development of a solution node of an automated plant for aeroponic growing have been considered. The paper describes the options for storing mother solutions, the methods for their dilution, automation of the Ph control process, the methods for selective assessment of the concentration of nutrients by NPK. A number of key problems that limit the full automation of solution nodes in a closed cycle of plant growing have been highlighted.
LA TECNOLOGÍA EN EVENTOS CONTEXTUALIZADOS PARA LA CONSTRUCCIÓN DEL CONOCIMIENTO DE NÚMEROS COMPLEJOS EN INGENIERÍA
Authors: Koua Ndjatchi Christophe Mbe
Published: March 2021

La investigación tuvo como objetivo determinar cómo favorece la tecnología en eventos contextualizados la construcción del conocimiento de números complejos en los alumnos. Este trabajo se fundamentó en la teoría de la Matemática en el Contexto de las Ciencias (MCC). Los resultados mostraron que la didáctica de la Matemática en Contexto contribuye a que los alumnos construyan su conocimiento. Esto es, los alumnos de Ingeniería en Sistemas Computacionales construyen su conocimiento de los números complejos cuando la matemática se vincula con el objeto principal de estudio de su carrera, dado que ellos tuvieron que desarrollar, en un lenguaje de programación de alto nivel, una calculadora para números complejos.
LA INCORPORACIÓN DE LAS TIC EN LAS ESTRATEGIAS DIDÁCTICAS: UN ESTUDIO DESDE LAS PRÁCTICAS DOCENTES EN EL NIVEL PRIMARIO
Authors: Lucía Bitti  Echeveste , Bressan Carla María , Monjelat Natalia
Published: March 2021

Este artículo presenta resultados de una investigación cualitativa, exploratoria y descriptiva, sobre la incorporación de las Tecnologías de la Información y la Comunicación (TIC) en las estrategias didácticas de docentes del nivel primario (segundo ciclo). La misma se realizó en dos escuelas de la ciudad de Rosario (Santa Fe, Argentina) empleando cuestionarios y entrevistas semi-estructuradas. A partir de un análisis estadístico descriptivo, se construyeron categorías de análisis emergentes y se identificaron respuestas textuales significativas. Considerando los discursos de los educadores sobre sus prácticas, los resultados indican que la totalidad de la muestra estaría incluyendo las TIC en sus estrategias didácticas, mostrando una diversidad en cuanto a la caracterización de los docentes, la utilización de diversos recursos y la implementación de éstos en diferentes actividades. Esto permitió identificar componentes y características de las estrategias didácticas tecnológicas en relación a la planificación educativa, las creencias de los docentes sobre estas herramientas, los criterios que establecen a la hora de seleccionar los recursos, la infraestructura tecnológica disponible y la capacitación en el uso de TIC. De esta forma, se aporta al conocimiento sobre el uso de TIC en el nivel  primario, con datos concretos que permiten una exploración y descripción de estrategias didácticas en contextos situados.
Oral health in patients with diabetes mellitus type 2 from the faculty of dentistry in San Francisco de Campeche 2016
Authors: Rosado-Vila Graciella , Zapata-May Rafael , Sansores-Ambrosio Fátima , Vidal-Paredes Jorge
Published: March 2021

Introduction: Insulin is a hormone secreted by the pancreas that has the function of controlling blood sugar concentration. The most common type of diabetes is type 2 which occurs 90 to 95% of cases. The most frequent alterations at the stomatological level are periodontal disease, gingivitis, caries, xerostomia (dry mouth syndrome), so there is a need to investigate how susceptible patients are to suffer from this disease and to be able to take the necessary preventive measures. had similar plaque levels. RESULTS: The sample studied corresponded to a total of 100 patients, 49 female (49%), and 51 male (51%). The average age of the sample was 54.89 years ± 10.85 years with a range of ages between 40 and 70 years. The most representative age group was the group of 40 to 50 years with 39%, followed by the group of 51-60 years with 37% and the group of 61-70 years with 24%. In the Gingival index it was found that 45% of the patients presented mild gingivitis, 13% moderate gingivitis and 21% severe gingivitis.
Study of the intellectual capital in the academic area of a higher education institution, in the state of Tabasco, for the development of an improvement proposal
Authors: García-Reyes David Antonio , Eliseo-Dantés Hortensia , Pérez-Pérez Iris Cristel , Castro-De la Cruz Jucelly
Published: March 2021

At present, intellectual capital is the most important resource for all organizations. Therefore, in the present research work the integral study will be carried out in the academic area of an institution of higher secondary education, in the state of Tabasco. It is proposed to design an instrument, which is considered a hybrid as it is formed by intangible information that is interpreted by the researcher and translated through a Likert scale to a quantitative data that allows to locate the study factor in a clear way to determine its degree of influence in the generation of intellectual capital. In addition, these factors are taken from experts in the study context whose experience allows them to give their opinion. This information is included in a double entry table that allows to find the key factors of incidence in the subject of study. The study is duly justified because it allows us to find the key factors that have the development of human resources to intellectual capital, which greatly benefits the context of study, in addition that an integral evaluation instrument will be provided since it covers tangible and intangible aspects in the measureme.
Theoretical and methodological design of a Didactic Model to enhance the teaching and learning processes of Mathematics at Instituto Tecnológico Superior de Poza Rica
Authors: Mazarío-Triana Israel Crecencio , Reyes-Andrade Demian , Loya-Escalante María Teresa , Hernández-Hernández Maritza
Published: March 2021

Higher Education Technological Centers through their Educational Model for the 21st century: Training and development of professional skills promote teachers to develop research projects in a way that allows them to improve the teaching process and thus contribute to the integral training of future professionals with knowledge, skills, abilities, attitudes and values that allow him to continue learning throughout his life. To achieve such purposes, a group of professors elaborated a research project in the area of Mathematics, assuming essentially the conceptual framework provided by Vygotsky's Cultural Historical Approach and the work of other authors with similar reference. The objective of this paper is to develop the conceptual and methodological bases of a Didactic Model that allows to direct in a scientific way the teaching and learning processes of Mathematics, according to the conditions of subjects such as Differential Calculus and Integral Calculus, as well as the environment which is presented in the institutions of the National Technological System, specifically in the Instituto Tecnológico Superior de Poza Rica, Veracruz state, Mexico.
Estudio de adsorción, retención y difusión de pesticidas piretroides como la permetrina en suelo agrícola y su capacidad para actuar como filtro
Authors: Miranda-Hernandez Karina , Loa-Arjona Joselyn , Guadalupe Alcantara-Rosales Rodolfo , Lagunas-Bernabe Ignacio
Published: March 2021

As a study of the proposal of a tertiary system for the improvement of the effluent quality of the wastewater treatment plant of the municipality of Jilotepec, the implementation of strategies has been sought, in order to achieve a qualitative research method, focusing on design and mathematical calculations, of wastewater use. To this end, the objectives are to carry out a research methodology proposed to analyze the arrangement of the aerators within the position of the Imhoff-type aerobic reactor, thereby achieving an acceptable sedimentation process, and subsequently to change the position of the aerators within of the aerobic reactor achieving a more complete cleaning to allocate the effluent for irrigation under the parameters of NOM-001-SEMARNAT-1996, looking for a better quality of effluent, with destination of urban use and as a calculation strategy it was proposed to implement a process of phytoremediation to avoid possible damage to the effluent
Julian Gaiarreren euskal gutuna: edizioa eta azterketa
Authors: Ulibarri Orueta Koldo
Published: March 2021

Artikulu honetan Julian Gaiarre (1844-1890) tenor nafarrak bere izebari euskaraz idatziriko gutun famatua editatuko dugu. Gutun hau normalean erronkariarra euskalduna zela frogatzeko besterik ez da aipatu, baina lan honek ikuspegi mugatu honetatik atera eta oraindik egiteke zegoen testuaren alderdi linguistikoa lantzea du helburu, xix. mendeko Erronkariko euskarari buruz hitz egiten digun lekukotasun garrantzitsua baita. Egindako transkribapenak konparatu, irakurketa berriak proposatu eta eskutitzaren hizkuntz ezaugarri garrantzitsuenak komentatuko ditugu, erronkarieraren gainontzeko lekukotasunen testuinguruan jarriz. Era berean, gutxitan aipaturiko erronkarierazko lekukotasunekin jarraituz, artikulu honen eranskin moduan, XVIII. mende erdialdean J. A. Arakistain fraideak Erronkari hiribilduan jaso zuen hitz zerrenda ekarriko dugu.
Сomparative analysis of the change of oxygen nonstoichiometry and superstructural ordering of Fe/Mo cations in the strontium ferromolybdate
Authors: Hurski L. I. , Kalanda N. A. , Yarmolich М. V. , Petrov А. V. , Golosov D. A. , Kirosirova М. V. , Ignatenko О. V. , Zhaludkevich А. L.
Published: March 2021

Sr2FeMoO6–δ single-phase samples without Fe/Mo cations superstructural ordering (P) and with Curie temperature 407 K were obtained by the solid-phase technique. According to the XRD data, the growth dynamics of the parameter P is nonlinear. In this case, the process of reaching maximum values of P (Pmax) is long and its rate is several times lower than the change of the oxygen index 6–δ. It was found that with increasing temperature of isothermal annealing, P increases and reaches maximal values 88 % at T = 1320 K for 120 h, Pmax = 92 % at T = 1420 K for 100 h, while Pmax = 90 % at T = 1470 K for 45 h. One can assume that the lower values of Pmax at T = 1470 K than at T = 1420 K are due to the influence of thermal energy on the destruction of chain ordering of Fe and Mo cations placed in staggered order. Based on the analysis of P time dependences, two relaxation processes can be found and the dP/dt = ¦(t) can be divided into two regions – I and II. In the region I the relaxation time is shorter than that in the region II. The point is that the ordering of cations in the –O–Fe–O–Mo–O chains in the region I requires atomic displacements by approximately one interatomic distance, whereas in the region II cation displacements occur over long distances with the formation of long[1]chain long-range ordering.
Dependence of the detected signal on the kinematic parameters of the satellite in the S-LIGO-E2R space system
Authors: Ohrymenko I. P. , Petrov Р. V. , Kolchevsky N. N.
Published: March 2021

The changes of distances less than ~10–21 are registered during the gravitational wave experiment. This feature determines the minimum size of experimental installations and the frequency range of gravitational wave detectors. To expand the frequency range and increase the sensitivity of gravitational interference detectors, it is necessary to increase the linear dimensions of the detector significantly as big as Earth and even more. The Republic of Belarus has experience in the development, launch and operation of satellites, the use of which can significantly increase the linear dimensions of the gravitational space detector. The satellite systems as a space detector of gravitational waves S-LIGO-NxR-zy are considered. The S-LIGO-NxR-zy space gravitational wave detector is a system of laser interferometers consisting of x number of satellites with given z-type orbits, in orbit of planet N of the solar system. The interferometers in such systems are identical to interferometers with oscillating mirrors due to the complex satellite motion. The purpose of this work is to study the influence of the kinematic parameters of satellites on the detected signal in the S-LIGO-E2R-z2 system. The configuration of the space detector determines the set of satellite orbits, direction and initial phase of movement. The detector signals depend on the instantaneous distance between the satellites and can be described as periodic functions. There are obtained the equations that describe the periodic changes in the signal between satellites as a result of their relative motion, depending on the initial conditions for launching the satellites. The general case for arbitrary oriented orbits and two special cases for collinear and orthogonal circular orbits in space gravitational wave detectors S-LIGO-E2R-z2-p and S-LIGO-E2R-z2-o are considered in the paper. The graphs of the dependences of the detected signal on the kinematic parameters of the satellites of the detectors S-LIGO-E2R-z2-p and S-LIGO-E2R-z2-o are presented. It is shown that the detected signals contain sections of zero intensity, and the duration and frequency of sections of zero intensity are related to the kinematic parameters of satellites.
Increasing the noise immunity of radio receiving paths with automatic sensitivity control
Authors: Zayats Р. V. , Malevich I. Y.
Published: March 2021

The relevance of the study of automatic sensitivity control systems (ASC) is determined by their demand for the creation and modernization of radio receiving paths (RRP) with increased noise immunity for radar systems, radio navigation and radio communication. The article analyzes typical attenuating ASCs, which are traditionally widely used to match the dynamic range (DR) of the RRP with the DR of a group radio signal, determined by the current state of the electromagnetic environment at the receiving system location. The fundamental possibility of increasing the noise immunity of RRPs with attenuating ASCs is shown on the basis of the current analysis of the resulting output signal in the IF main filter band. At the same time, it was found that the procedure for determining the optimal value of the attenuator transmission coefficient is characterized by low response speed. In addition, an increase in noise immunity in a RRP with such ASC leads to a significant loss of sensitivity. To overcome the disadvantages of attenuating ASCs, structures that implement the exchange of the transmission coefficient of the RRP to DR and linearity are proposed. Studies of various possible ASC structures have shown that with a proportional exchange of the transmission coefficient for the DR, an improvement in the noise immunity of the RRP is provided while maintaining a high sensitivity of the system. An original ASC system is proposed, which is invariant to the sampling step of the transmission coefficients of controlled elements with increased performance. The considered structural solutions and algorithms make it possible to optimize the technical appearance of RRPs for radar, radio navigation and radio communication with increased noise immunity and to adapt their characteristics to the conditions of nonstationary electromagnetic environment.
Structure of navigation information as a criterion of efficient visualization of a lean hospital
Authors: Kurmangulov Albert A. , Isakova Dilara N. , Brynza Natalya S.
Published: March 2021

Objectives to determine the main types of structuring information of navigation systems in medical organizations of the Russian Federation and evaluate their compliance with the principles of lean production.
Material and methods. A structural analysis of the types of information presentation in navigation systems was based on the publications selected from the E-library, Medline, Scopus, PubMed and the Cochrane Library databases. The research process included the use of research methods for law, historical, descriptive-analytical methods, content analysis.
Results. The structuring of navigation information can be done according to numerological, architectural, routing, alphabetical, structural, functional and combined principles. The optimal choice of the principle of organizing information should depend on how detailed the navigation system is, on the analysis of the architectural solutions used for a medical organization and on the calculation of navigation objects. It is possible to increase the efficiency of structuring navigational information using an appropriate color scheme, infographic and compositional solutions. When improving the navigation systems of medical institutions as a part of lean hospital management, it is necessary to audit all available navigation elements to determine the principle of structuring the information.
Conclusion. The effective visualization of a medical institution is the provision of clear and understandable navigational information. One of the most effective methods to systematize the navigation information is its structuring.
Um problema de navegação de Zermelo: Métrica de Funk
Authors: Chávez Newton Mayer Solórzano , León Víctor Arturo Martínez , Sosa Luz Gisselle Quevedo , Moyses Junior Rodrigues
Published: March 2021

O artigo aborda um modelo específico de Geometria Não-Euclidiana, cujo disco aberto unitário centrado na origem do plano cartesiano é dotado de uma métrica de Randers, que modela o Problema da navegação de Zermelo. Com isso, é gerada a "Geometria de Funk sobre o disco unitário", para qual a distância não é simétrica. Nesse sentido, o estudo apresenta as expressões para distância de ponto a ponto - de ponto a uma linha reta, e de uma linha reta a um ponto; e caracteriza as circunferências nesse tipo de geometria. Exemplos explícitos são incluídos.
Bonding of LiNbO3 and Si wafers at room temperature using Si nanolayers
Authors: Watanabe Kaname , Utsumi Jun , Takigawa Ryo
Published: March 2021

We report the room temperature bonding of LiNbO3 and Si wafers based on the use of Si nanolayers. The proposed method employs physical sputtering, which simultaneously activates the surface of an etched Si wafer and forms a Si nanolayer on the surface of a LiNbO3 wafer. Following sputtering, both wafers are immediately brought into contact and the newly formed Si nanolayer acts as a nanoadhesive. The data presented herein demonstrate that this technique is more effective at directly bonding LiNbO3 and Si than the conventional surface-activated bonding method. Following activation, the bonded surface energy, which reflects the bond strength, was estimated to be approximately 2.2 J m−2. This result indicates that the bonding was strong enough to withstand the processes associated with the fabrication of microelectronics devices, including wafer thinning.
Portable particle sorting device based on digital microfluidics utilizing micropillars
Authors: Lee Jae Yong , Kwon Soon Yeol , Kim Seung Deok , Kim Yu Seong , Jung Dong Geon , Kong Seong Ho
Published: March 2021

With introducing the possibility of early diagnosis through biomarker detection, this method has become important in the field of disease diagnosis. Particle sorting based on conventional digital microfluidics (DMF) mostly employs magnetic beads. In this study, the micropillar-based DMF device confirmed the ability of microbead filtering to detect specific biomarkers. The proposed device was implemented using micro-electromechanical systems, and SU-8 micropillar was realized based on the micro-patterning technology. DMF was able to control droplet movements considering the principle of electrowetting on dielectric. The moving speed of a droplet varied according to the electrode shape and applied voltage. As the droplet moved, the polystyrene bead was sorted corresponding to the interval of the fabricated SU-8 micropillar.