bluuebunny/crossref_metadata_2025 huggingface dataset:
Recruitment of Participants for a 3D Virtual Supermarket: Cross-sectional Observational Study (Preprint)
Authors: Hoenink Jody C , Mackenbach Joreintje D , van der Laan Laura Nynke , Lakerveld Jeroen , Waterlander Wilma , Beulens Joline W J
Published: April 2020

BACKGROUND

Virtual supermarkets offer a practical and affordable setting to test the efficacy of different pricing and nudging strategies before they are implemented in the real world. Despite the advantages of using virtual supermarkets for this purpose, conducting studies in online settings is challenging with regard to recruitment and retention of sufficient and suitable participants.

OBJECTIVE

To describe cost, time, and retention with regard to participants recruited using various strategies and potential sociodemographic differences between participants recruited via different strategies.

METHODS

This cross-sectional study used data from a randomized controlled trial in which 455 Dutch adults with low and high educational levels were invited to shop 5 times in a 3D virtual supermarket. Participants were recruited via social media and flyers. A log that tracked the costs of and time spent on the different recruitment strategies was kept by the study team. Outcome measures included the cost of recruitment strategies, the time investment by researchers, and recruitment and attrition rates of participants in the study.

RESULTS

The median age of study completers was 31.0 (IQR 25.0) and 157 out of 346 study completers (45.4%) were highly educated. Out of the 455 included participants, 235 (51.6%) were recruited via social media campaigns, 131 (28.8%) via home-delivered flyers, 38 (8.4%) via flyers directly distributed by the study team, and 46 (10.1%) via word-of-mouth. Of all paid recruitment strategies, social media campaigns were the cheapest and least time-consuming, whereas the distribution of flyers by the study team was the most expensive and time-consuming recruitment strategy. Age, sex, overweight status, employment situation, and number of adults within the household varied by recruitment strategy.

CONCLUSIONS

Using different recruitment strategies resulted in the efficient recruitment of a representative study sample and retention of participants was relatively high. While “word-of-mouth” was the most cost- and time-effective recruitment strategy, using only one type of recruitment strategy could result in a demographically skewed study population.
Mathematical Modelling to Assess the Impact of Lockdown on COVID-19 Transmission in India: Model Development and Validation (Preprint)
Authors: Ambikapathy Bakiya , Krishnamurthy Kamalanand
Published: April 2020

BACKGROUND

The World Health Organization has declared the novel coronavirus disease (COVID-19) to be a public health emergency; at present, India is facing a major threat of community spread. We developed a mathematical model for investigating and predicting the effects of lockdown on future COVID-19 cases with a specific focus on India.

OBJECTIVE

The objective of this work was to develop and validate a mathematical model and to assess the impact of various lockdown scenarios on COVID-19 transmission in India.

METHODS

A model consisting of a framework of ordinary differential equations was developed by incorporating the actual reported cases in 14 countries. After validation, the model was applied to predict COVID-19 transmission in India for different intervention scenarios in terms of lockdown for 4, 14, 21, 42, and 60 days. We also assessed the situations of enhanced exposure due to aggregation of individuals in transit stations and shopping malls before the lockdown.

RESULTS

The developed model is efficient in predicting the number of COVID-19 cases compared to the actual reported cases in 14 countries. For India, the model predicted marked reductions in cases for the intervention periods of 14 and 21 days of lockdown and significant reduction for 42 days of lockdown. Such intervention exceeding 42 days does not result in measurable improvement. Finally, for the scenario of “panic shopping” or situations where there is a sudden increase in the factors leading to higher exposure to infection, the model predicted an exponential transmission, resulting in failure of the considered intervention strategy.

CONCLUSIONS

Implementation of a strict lockdown for a period of at least 21 days is expected to reduce the transmission of COVID-19. However, a further extension of up to 42 days is required to significantly reduce the transmission of COVID-19 in India. Any relaxation in the lockdown may lead to exponential transmission, resulting in a heavy burden on the health care system in the country.
Partisipasi Masyarakat Dalam Kesenian Soreng Guna Meningkatkan Ketahanan Budaya (Studi Di Desa Banyusidi, Kecamatan Pakis, Kabupaten Magelang, Jawa Tengah)
Authors: Fitiriasari Paramitha Dyah
Published: April 2020

ABSTRACT Soreng, a piece of folkdance from Magelang, had a special position for its society. This research aimed to understood and analysed the fabulous public participation in Banyusidi village, Pakis sub-district, Magelang district. People became an active participant to arised the existence of Soreng. It was also a good way to increased a cultural resilience. This research used a qualitative method and ethnography approach. The data was collected by literature study, observation, and interview to the artist and people around it. It had analysed by descriptive analytics ways. This research found the trichotomy of the artists, society, and tradition. They were three main pillars to preserved traditional performing art in the society. People could develop their skill, expression, and their own creativity. That activity increased the cultural resilience in society. It was an important things because the survival of an art depend on the social participation. Finally, art was supported to cultural resilience rising. ABSTRAK Kesenian Soreng di Kabupaten Magelang memiliki posisi khusus di hati masyarakat. Penelitian ini bertujuan untuk mengetahui dan menganalisis bentuk partisipasi masyarakat Desa Banyusidi Kecamatan Pakis, Kabupaten Magelang sangat besar dan terlihat di dalam kesenian soreng. Masyarakat dengan berbagai peran secara aktif menjadi bagian dalam kesenian soreng guna meningkatkan ketahanan budaya.Metode yang dipakai adalah kualitatif dengan pendekatan etnografi. Melalui dengan teknik pengumpulan data melalui studi pustaka, observasi dan wawancara kepada beberapa seniman dan masyarakat.  Data yang telah dikumpulkan kemudian dianalisis secara analitik deskriptif.Hasil penelitian  ditemukan bahwa trikotomi antara seniman, masyarakat penyangga dan adat merupakan tiga pilar penyangga yang hingga kini dipandang cukup efektif untuk mempertahankan dan melangsungkan tradisi seni pertunjukan di daerah. Masyarakat dapat mengembangkan bakat, ekspresi dan kreativitas dengan porsi masing-masing. Hal semacam itu menyebabkan adanya peningkatan terhadap ketahanan budaya yang tampak di komunitas masyarakatnya. Oleh sebab itu sebuah kesenian tidak dapat bertahan lama ketika sudah tidak ada penyangga atau partisipasi dari masyarakat. Hal tersebut juga sangat identik dengan ketahanan budaya yang juga meningkat dengan adanya kesenian.
Conservation, Phytoremediation Potential and Invasiveness Status of Bali Botanic Garden Aquatic Plant Collection
Authors: Kuswantoro Farid
Published: April 2020

Bali Botanic Garden (BBG) aspires to conduct conservation and research of eastern Indonesian plant species, including the aquatic plant species. These were important as aquatic plant species could be ecologically threatened, beneficial or even dangerous. As scientific data of BBG aquatic plant species collection was limited, we proposed this study to provide researchers and garden managers with data to conduct research, collection and maintenance of the garden aquatic plant collection. The study was carried out by sourcing list of BBG collected plant species data for its aquatic plant species. Literatures study was then carried out to gain information regarding the plant species’ heavy metal phytoremediation, conservation and invasiveness status while data analysis was conducted descriptively. The study result showed that 38 collection numbers of aquatic plant species collected in BGG were placed in five sites within the garden with 94% of all the aquatic plants collection came from Lesser Sunda Islands. Eleven aquatic plants species were listed as Least Concern by IUCN Red List. Fourteen species of collected aquatic plants were proved to possessed phytoremediation potential toward numerous heavy metal pollutants, while six species were listed as an invasive alien plant species in Indonesia. All of the provided data should be enabled the botanic garden stakeholders to come up with ideas in the research and maintenance effort of BBG aquatic plant collection.
Tree Species Composition and Natural Regeneration Status of Southeast Region of Bangladesh
Authors: Dey Abir , Akther Aklima
Published: April 2020

The study aimed to quantify and discuss the current condition of the tree species composition and natural regeneration of southeast parts of Bangladesh (Cox’s Bazar North Forest Division). A total of 121 stems having dbh ≥10cm and 3481 stems of regenerating tree species (dbh <10cm) per hectare were recorded. A large trees comprised of 17 species belonging to 10 families and 14 genera and 30 regenerating tree species belonging to 19 families and 27 genera have been found. The forests were highly non-uniform, with three or four species represented most of the stands. The values of diversity indices indicated limited plant diversity, which is dominated by two or three tree species. Stems of 10-30 cm dbh contributed almost 90% of the total stem density, whereas more than 80% of the total basal area still belonged to trees with dbh 100 cm or above. Dipterocarpus turbinatus was the most dominant species which have the highest Importance Value Index (IVI) with 135.82 and embodied 37.71% of the total stand density and 72.19% of total basal area. The study will provide scientific basis for the future implementation of forest conservation strategies in tropical forests of Southeast Asia, particularly in Bangladesh. This study may also pave the way to further research on regeneration potentials of the native species for conservation and enhancement of forests in future.
Bioethanol Levels of Dragon Fruit (Hylocereus polyrhizus) Peel with the Addition of Blend Crude Cellulase Enzyme from Trichoderma reesei and Aspergillus niger
Authors: Widyaningrum Trianik , Parahadi Masreza
Published: April 2020

The petroleum fuel crisis shows that Indonesia's fossil energy reserves are limited. It is necessary to develop an environmentally, friendly and sustainable alternative energy, one of which is bioethanol. This study aims to determine the bioethanol levels of dragon fruit (Hylocereus polyrhizus) peel with the treatment of cellulase enzymes from Trichoderma reesei and Aspergillus niger. This research was an experimental study that uses steps such as making dragon fruit peel substrate and filtrate, cellulose degradation with enzymes from Trichoderma reesei and Aspergillus niger and inoculating with yeast (Saccharomyces cerevisiae) with a fermentation time of 96 hours and then measured reducing sugar levels with the method of DNS, distillation, and the measurement of bioethanol levels using alcohol meters. The results have shown that using enzymes from Trichoderma reesei and Aspergillus niger can increase the reduction of 49.68 %  sugar levels in the treatment of T.reesei: A.niger (3: 1) and produce the highest bioethanol level, which is 2.46 % in the treatment of T.reesei: A.niger (2: 1)
Optimation of Spirulina sp. Growth in Walne Media with Variation of Urea and NaHCO3 Supplements
Authors: Caturwati Lusiana Novia , Setyati Retno Herrani
Published: April 2020

One alternative biofuel to substitute fossil fuels is bioethanol. Microalgae Spirulina sp. contains high carbohydrates, which has 17-25% potential to produce bioethanol. Urea and NaHCO3 can be used as additional nutrients sources of nitrogen and carbon to Spirulina sp. cultivation. Deficiency of nitrogen causing the cell’s enzymes change that shown through decreased lipid and chlorophyll synthesis. While deficiency of carbon can affect the growth rate. In this research, the growth rate of Spirulina sp. is analyzed using Optical Density (OD) method. The growth rate calculation is used to measure the growth of microalgae cells shown in the growth curve. This was a laboratory-scale method using CRD with 4 treatments and 5 replications namely treatment A addition of 0.36 g/500 ml urea without addition of NaHCO3, treatment B addition of 0.043 g/500 ml NaHCO3 without addition of urea, treatment C addition of 0.36 g/500 ml urea and 0.043 g/500 ml NaHCO3, and control without addition of urea or NaHCO3. The results indicated that addition of urea and NaHCO3 didn’t affect to OD and Spirulina sp. growth rate. The highest growth rate was treatment A with 0.00906/day of growth rate followed by treatment C which has 0.00865/day of growth rate. Treatment B and control treatment (K) showed a low growth rate. The maximum OD value obtained in treatment C was 0.674 cells/ml on the 10th day. This research can be used as the reference to larger scale of Spirulina sp. cultivation in the field of bioethanol production.
TOLERANCE, MULTICULTURALISM AND INTERCULTURALISM IN THE BALKANS
Authors: Todorović Dragan
Published: April 2020

A multicultural society should possess the characteristics of a society in which different ethnic groups live together but with no interaction. The minority groups living therein are passively tolerated without being accepted by the majority group. An intercultural society should be defined as a society in which different groups live together and exchange their life experiences with mutual respect for their different styles of life and values. That is why a correct starting definition of interculturalism would be that interculturalism is a critique and an alternative to multiculturalism. It is possible for the members of different cultures to live close to each other and that is the most crucial characteristic of multicultural societies. An intercultural society represents a society in which we live and create not close to each other but with each other and for each other.Accordingly, the contemporary Balkan society is facing the process of its transition from the multicultural into the intercultural one, that is, the process of spreading and adopting the idea and practice of interculturalism in a multicultural community. More precisely, this implies the development of the concept of a cultural and educational policy that would foster appreciation of cultural diversity and lead to the creation of a society in which different cultures interpenetrate.At the end of the paper the measures of the public cultural politics of the Balkan countries aiming at improvement and advancement of the existing intercultural dialogue are summed up.
SOCIAL TRAUMA AND EMOTIONAL ATTACHMENT
Authors: Pedović Ivana , Hedrih Vladimir
Published: April 2020

Trauma can be described as an injury that leaves permanent consequences, latent traces that can be activated in periods of crisis (Krstić, 2009). In the second part of the 20th century, the term trauma started being used ever more outside the medical and psychiatric context and entering the domain of social sciences (Sztompka, 2009). In the scope of this, one way the concept of trauma is used is in confronting negative and dysfunctional consequences that social change can leave in its wake. Various authors have studied social and psychological consequences of social changes on individuals and society. In this way, they opened the road to recognizing a new meaning of trauma, which they titled cultural or social trauma. It is known that the theory of emotional attachment states that in crisis or traumatic situations, members of a family group feel insecure, that risks in the environment can lead to lowered responsiveness of the parents, but it is less widely known if unresolved traumatic experiences of parents can be transferred to children and their later emotional attachment patterns. There is particularly little knowledge on whether significant social changes leave consequences on emotional lives of individuals and the emotional lives of their children. In this paper, we try to make a brief review of the literature on the topic, and summarize the theoretical and partly empirical knowledge in the area that exists so far.
CRITICAL PEDAGOGY - MOVEMENT FOR STUDENTS VOICE, TEACHER′S AUTHORITY AND EQUALITY IN EDUCATION
Authors: Andjelković Aleksandra K.
Published: April 2020

Critical pedagogy has significant place among the papers of numerous researchers and theoretician of education especially in the USA. The central focus of this paper is directed to historical development of critical pedagogy, the most significant postulates and on ideas of their bearer. The starting points for considering presents the ideas of critical pedagogues as Paulo Freire and Henry Giroux, ideas of Jean Jacques Rousseau and John Dewey that are considered as forerunners of this movement, until the contemporary representatives of critical pedagogy who continued to support and develop this approach. The aim of this paper is to consider the influence of critical pedagogy and its representatives on school practice and education. It can be concluded that promoted idea, which was created and developed in critical pedagogy that education is never „sterile clean“, is impregnated with reflections of numerous political, economic and social circumstances, and it stayed as future vision to be considered by theoretician of education, pedagogues and pedagogy of future. At the end, some of the implications for modern pedagogical practice, formed by analyzing the critical pedagogy and needed to nurture in school practice are separated, those implications are developing teachers’ critical spirit and its autonomy, nurturing the quality in relations with students that induce their development and improve outcomes, the strength of the dialogue culture which respects the right to be different and which straightens the ethical responsibility of teachers that represents the basics of teachers’ identity development and building of their profession.
ELECTRONIC EVALUATION IN TEACHING CLASS: ASSESSMENT VALUE OF EDUCATIONAL SOFTWARE
Authors: Stanojević Dragana , Stanković Zoran , Maksimović Jelena
Published: April 2020

As a result of the expansion of informatics era, in the last decade is a noticeable focus on the development and application of ICT in education, which, thanks to its rapid development marks the era of electronic education. The goal of electronic education is actually a modernization of the teaching process, which will enable teachers the reduction of teaching duties, simplify preparation and teaching and testing students' knowledge, which with the electronic platform is becoming an important component of a multimedia approach to teaching. The main objective of this work is to draw attention to the general pedagogical expert and scientific public and to point to a wider range of options provided by this type of evaluation in the educational process, and it is already at the level of teaching classroom. In this sense, in the paper, in addition to theoretical considerations are presented and acquired experience from practice,  resulting from implementation assessments potential of created educational software, as well as the experience of using modern educational technology.
TEACHING CONTENTS OF SCIENCE AND SOCIAL STUDIES FOR THE PURPOSE OF ENVIRONMENTAL EDUCATION
Authors: Spasić Stošić Ana
Published: April 2020

Within the system of institutional education and training close attention is being devoted to environmental education in primary schools. In the last few decades we have witnessed a significant vulnerability of the environment, so environmental education of young people from an early age becomes a necessity that should be continuously studied and promoted. In addition to educational element, there is an increasing demand for the improved realization of environmentally educational component. This paper analyses the curriculum of the subject Science and Social Studies in the third and fourth grade of primary education with the aim of establishing the presence of contents related to environmental education and environmental awareness development among children. By analyzing the teaching contents of the subject Science and Social Studies, teaching units have been recognized that, directly or indirectly, indicate to pupils the significance of the environment protection, thus showing them their role in the process of environmental awareness development. The contents of the subject Science and Social Studies offer great possibilities for knowledge, skills and habits acquisition in the area of the environment protection and promotion.
PARENTAL EDUCATIONAL STYLE FROM THE ADOLESCENT PERSPECTIVE
Authors: Milosavljević Đukić Tatjana B. , Bogavac Dragana S.
Published: April 2020

Family as a complex, multidimensional phenomenon cannot be treated as a simple sum of its individuals. That family is a unique system is indicated by the fact that it is based on multiplied contexture of interaction and communication with the environment. In this state it has a tendency towards morphogenesis i.e. the processes of constant change, as well as in morphostasis i.e. establishing balance especially in situations where it is disturbed. Prerequisite to effective education are healthy relationships of individuals within a family as a system. When it comes to adolescents, family is a key concept. This paper focuses on the empirical approach to this issue. The aim of this research is evaluation of parental educational actions from the adolescent perspective. The sample consisted of 297 questionees (99 pupils (adolescents) and their parents – 99 mothers and 99 fathers). The descriptive method was used in this research. For the sake of this research a five-level Likert scale was constructed. This scale contains 30 items that represent various parental educational styles (authoritarian-warm, authoritarian-cold, liberal-warm, liberal-cold and democratic). After analyzing the descriptive indicators, as well as the distribution regularity measures, factorization of the questionnaire was conducted. The Alpha-Factoring method was used with promax rotation. As ameasure of representativeness the Kaiser-Meyer-Olkin (KMO) test was used. The paper proves that it isn’t enough to focus on the educational styles from the parent perspective,but to get the whole pedagogical picture we also have to take into account the child/adolescent perspective.
UTILIZATION OF ORGANIC FRACTION OF MUNICIPAL WASTE IN ACCORDANCE WITH THE PRINCIPLES OF CIRCULAR ECONOMY – A CASE STUDY
Authors: Stefanovic Gordana , Milutinović Biljana , Ivanović Milica , Momčilović Ana
Published: April 2020

The organic fraction of municipal waste (MW) is a huge resource of nutrients and energy, primarily because of the high content of carbon as well as potassium and phosphorus. On the other hand, having in mind the problems that cities are faced with, such as energy supply, transportation, environmental pollution and many others, waste management has to be considered as an integral part of city management. Circular economy is a new concept of thinking which implies that all streams of a system should be considered as a possible resource, including waste. The organic part of municipal waste can be used in several ways. Anaerobic digestion (AD) that produces biogas and compost can be a part of the chain of circular economy of a city. This paper deals with the organic waste generated on the territory of the city of Nis with the focus on its potential in terms of carbon, hydrogen and mineral content. Based on the elementary analysis and quantity of waste, the streams of carbon and other elements that circulate through waste, biogas and compost have also been analyzed. Moreover, energy needs for AD function and transportation of both MW and compost are calculated. The analysis shows that the energy produced by AD can cover the energy needs for the proposed model, and the amount of produced compost is enough to recover nutrients on the majority of green yards in the city.
LONG-TERM NOISE MEASUREMENTS AND HARMONICA INDEX AS A WAY OF RAISING PUBLIC AWARENESS ABOUT TRAFFIC NOISE IN THE CITY OF NIŠ
Authors: Praščević Momir , Mihajlov Darko , Cvetkovic Dragan , Gajicki Aleksandar
Published: April 2020

Environmental noise level monitoring in Serbia is performed in several cities and it is pursuant to the Law on Environmental Noise Protection and the accompanying regulations. Although these regulations are in accordance with the national standards, the methodology of noise monitoring varies in different cities. The issues which differ include the following: the number of measurement spots, the number of daily, weekly, and monthly measurement intervals, the duration of measurement intervals, measurement parameters and noise indicators used for noise evaluation. Different measurement procedures are the consequence of diverse city configurations, traffic structure, traffic flow, locations of noise-sensitive objects, as well as diverse contribution of noise sources. The road traffic noise level monitoring in the City of Nis has been organized from 1995 until today based on short-term measurements. The values of noise indicators are calculated based on these short-term measurements. The two newly purchased noise monitoring terminals by the Noise and Vibration Laboratory of the Faculty of Occupational Safety in Nis, enabled the long-term noise measurements. The procedure of permanent and semi-permanent road traffic noise measurements at eight locations in the City of Nis has been carried out since January 1, 2014. The results of long-term road traffic noise measurements at the main streets of Niš city are presented in this paper as well as the possibility of their presentation in the sense of the Harmonica index.
PROPERTIES OF HYDROENTANGLED NONWOVEN FABRICS MADE WITH GREIGE COTTON LINT, SELECTED MANMADE STAPLE FIBERS, AND THEIR INTIMATE BLENDS WITH THE LINT IN DIFFERENT BLEND RATIOS
Authors: Singh Sawhney Amar Paul , Reynolds Michael
Published: April 2020

For the first time ever, a preliminary study has been conducted to assess the effects of intimate blending of greige (raw) cotton and certain commonly used manmade fibers on properties of the resulting nonwoven fabrics made with different blend ratios. Implementing the hydroentanglement system of making nonwoven fabrics, twenty one (21) fabrics were made separately, using the selected pre-cleaned Upland greige cotton lint, polyester, polypropylene, Tencel, viscose rayon, bleached cotton, and intimate blends of the cotton lint with the other fibers in 80:20, 50:50 and 20:80 blend ratios. With the exception of 100% polypropylene fiber and its 80:20 intimate blends with cotton, all other fibers and their various blends with the greige cotton were processed on the mill-like equipment available at the Center. The fabrics were not scoured and/or bleached to totally remove the greige cotton’s native (hydrophobic) waxes. The results have shown that the improvement of desirable features of absorbency and whiteness of optimally blended greige cotton-based nonwoven fabrics could be significant incentives for rethinking cotton’s use in nonwovens, especially in the fem-hygienic products where the consumer’s choices of good absorbency, whiteness and comfort indeed matter!
TWO-PHASE TURBULENT FLOW IN STRAIGHT HORIZONTAL CHANNELS WITH A SQUARE CROSS-SECTION TAKING INTO ACCOUNT THE INFLUENCE OF VERTICAL FORCES
Authors: Milanović Saša , Jovanović Miloš , Spasić Živan , Nikolić Boban
Published: April 2020

The paper presents a numerical simulation of a two-phase turbulent flow in pneumatic transport through straight horizontal channels with a square cross-section. The transport of solid particles of ash and flour is taken as the two-phase flow, while air is chosen for the transporting fluid. The motion of solid particles occurs due to the aerodynamic forces of the transporting fluid. The paper considers the motion of solid particles by taking into account the influence of vertical forces, which act on the transported solid particles. In flow modelling, the transported solid particles are reduced to spherical shapes. The stress model of turbulence is corrected by taking into account the influence of the induction of secondary flows of the second kind in the gas phase. The full Reynolds stress model is used to model the turbulence, with the application of the complete model for turbulent stresses and turbulent temperature fluxes. The paper presents the results of the numerical grid with the highest resolution above which the increase of the mesh density does not affect the obtained results. The diagrams of the positions of the transported solid particles are provided for cross-sections normal and parallel to the flow direction.
OPTIMIZATION OF ULTRASONICALLY ASSISTED ADSORPTION OF Cu(II) ON CARBONIZED AND ACTIVATED WALNUT SHELLS
Authors: Milenković Dragan , Milosavljević Milutin , Bojić Aleksandar
Published: April 2020

The effects of ultrasound (US) on the adsorption process of Cu(II) on granulated activated carbon (GAC), produced by walnut shells, was studied in this paper. Equilibrium results of the adsorption process are tested by Freundlich and Langmuir adsorption isotherms, and their linearization and determination of model parameters k; n; b and Qo. The adsorption capacity of GAC is 1.7 to 3.86 mmol/g with the use of US, and 0.66 to 2.7 mmol /g without the use of US. The increase of specific surface and initial concentration increase the efficacy of adsorption. Acquired mathematical regression equations very well represent experimental results, and the correlation coefficient (R2) is greater than 0.993.
THE ENVIRONMENTAL IMPACT OF RADIONUCLIDES FROM SOIL AND CLAY MATERIAL FOUND IN "ZBEGOVI" DEPOSIT IN DONJE CRNILJEVO
Authors: Ilić Sreten , Golubović Tatjana , Marković Tatjana , Pajić Nataša
Published: April 2020

The paper presents the results of testing radionuclide content in soil and clay samples on the surface mine "Zbegovi" in Donje Crniljevo, Serbia. The results of the study show that the activity of clay samples and surrounding soil derives mainly from natural radionuclides: 232Th, 238U and 40K. The radioactivity of the samples was determined by the gamma spectrometric method using HPGe detector with relative efficiency of 56.2%. The obtained results show that the tested samples can be used as material for brick and ceramic products, cosmetics as well as the fact that the tested clay deposit does not have a negative impact on humans, plants and animals.
WALRUS: THE SENSITIVE GIANT IN THE ERA OF CLIMATE CHANGE: CLIMATIC ADAPTATION AND CHALLENGES
Authors: Tsiouvalas Apostolos
Published: April 2020

There is no doubt that the cryosphere is changing, the planet's temperature is increasing and ice is retreating. Earth is gradually experiencing the repercussions of global warming which are most visible at high latitudes, and especially in the Arctic, the home of Odobenus Rosmarus or simply Walrus. The walrus is one of the most ice-dependent species. Walruses use sea ice for crucial behaviours like giving birth, feeding and resting. As the seasonal dynamics of ice cover on arctic seas change, walruses tend to congregate on coasts without ice. Thanks to this adaptation of walruses to different climate trends they have successfully survived and conserved their populations. Its adaptability has been the driving force behind preventing the walrus from being listed as an endangered species. Some scientists are attributing this trend to a normal adaptive behaviour of the mammal, while others already have noticed a risk violently posed by climate change. This article is motivated by the announcement of the U.S. Fish and Wildlife Service that the walruses were unlikely to be considered endangered in the foreseeable future, addresses the vulnerability of walruses to climate change, explaining their dependence on sea ice and the need for reconsideration of the above statement.
INSTITUTIONAL FRAMEWORK FOR ACCIDENT MANAGEMENT: A CASE STUDY IN FIRE RESCUE BRIGADES PRACTICE
Authors: Božović Marijola , Mihajlović Emina , Ilić-Krstić Ivana , Živković Snežana
Published: April 2020

Managing the risk of accidents for the purpose of ensuring occupational and environmental safety involves a number of activities, measures, and programs to be taken before, during, and after an accident in order to avoid it, reduce its impact, and mitigate its effects, respectively. A company or another legal entity is obligated to devise an accident protection plan and to adhere to it when taking measures of accident prevention and minimization of the impact on human life and health, property, and the environment. The structure of such a plan is presented along with the legal framework for accident management.This paper contains an insight about opinions of the members of fire rescue brigades regarding various aspects of emergencies in the context of accident management in general. A total number of 45 respondents participated in the study. Findings indicate that almost all respondents believe that their skills and abilities are applicable in the intervention phase and less than a half believe that their skills are applicable in prevention phase, while two-thirds of respondents stated that they have support for further education and upgrading in their organizations.
Revisiting the Cupidito unit (Cupido Formation) along peritidal carbonates from northeastern Mexico
Authors: Torres de la Cruz Felipe de Jesús , Chacón-Baca Elizabeth , Chávez-Cabello Gabriel , Hernández-Ocaña María Isabel
Published: April 2020

Depositional episodes are readily identified along representative localities of the Lower Cretaceous Cupido platform in northeastern Mexico. The basal part of the Cupido Formation exhibits a progradational reef platform that, at the upper limit, is truncated by a sequence boundary defined by a breccia. This breccia marks the development of a peculiar sedimentary facies informally known as the Cupidito unit, a distinctive stratigraphical unit in northeastern Mexico that remained uninterpreted for decades. Through the analysis of facies, microfacies and stable isotope comparisons from representative localities (Potrero Chico, Potrero de García, La Huasteca, La Muralla and Puerto Mexico) and from other previously reported outcrops, this work describes six diagnostic features for Cupidito and an improved stratigraphic model is proposed. The depositional sequence suggests a broad flat-topped platform with a general low organic productivity and restricted conditions followed by recurrent inundations of lagoon waters. Before drowning, this carbonate platform remained under equilibrium conditions interrupted by short pulses of relative higher-temperatures (48.3 °C and 39.2 °C). Coral-rudist-stromatoporoid patch-reefs with inferred inter-tropical temperatures between 31.5 °C and 32.2 °C originated as a progradational response to the instauration of a new Sequence Boundary at the base of Cupidito.
Phenotypic variation in American bullfrogs (Lithobates catesbeianus) bred under intensive systems in Mexico: A preliminary report
Authors: Ayala-García Braulio , Fuentes-Farías Alma Lilia , Gutiérrez-Ospina Gabriel
Published: April 2020

Commercial bullfrog farming has increased steadily in Mexico from 1925 to satisfy both the national and international markets. However, intensive production systems are still scarce, and there is a need for information to help further advance their development. Therefore, this study aimed to characterize and compare morphometric and physiological traits of bullfrogs bred under intensive culture systems. Three-year-old breeding adults (n = 100) from five farms in three different states, and one-year old juveniles (n = 60) from two of these locations, were used in the study. The scaled mass index (SMI) was calculated by considering body weight and snout-vent length measurements. Hematocrit and white blood cell concentrations were determined in juveniles, and a leukocyte profile was established. Eight linear (based on measurements from photographs of the skull), plus one geometric, variables, were used for morphometric analyses. Results show that the SMI did not vary between localities or gender in juvenile frogs, while differences were found both between sexes (p < 0.026) and between farms (p < 0.001) in adult frogs. Hematocrit and neutrophil concentrations in juvenile individuals also differed between localities. Linear and geometric morphometric analyses in juvenile frogs showed differences between sexes (p < 0.001) and between localities (p < 0.001), the latter suggesting the existence of at least two morphotypes of this species. This study presents relevant information to help advance bullfrog farming in Mexico.
Implementación de habilidades de argumentación y modelaje en la clases de química del bachillerato
Authors: Montaño Hilario José Manuel , Padilla Martínez Kira
Published: April 2020

El desarrollo de habilidades de pensamiento científico se ha vuelto cada vez más importante en la enseñanza de las ciencias. Sin embargo, es difícil que los estudiantes desarrollen más de una habilidad al mismo tiempo. En este trabajo se muestra la implementación conjunta de las habilidades de argumentación y modelaje durante dos periodos de enseñanza de la química en el bachillerato. Se utilizó la rejilla de argumentación de Toulmin para fomentar la reflexión en torno a la estructura del argumento. Los resultados se evaluaron a través de una rúbrica que permitió evaluar tanto el modelaje como la argumentación. Los alumnos argumentan y modelan dependiendo del tipo de instrucciones planteadas; sin embargo, no se alcanzan niveles altos de desarrollo de estas habilidades
Determinación de la eficiencia de un mini panel solar fotovoltaico: Una experiencia de laboratorio en energías renovables
Authors: Novoa Jerez José Enrique , Alfaro Marco , Alfaro Ignacio , Guerra Rodrigo
Published: April 2020

Prácticas de laboratorio de bajo costo y de fácil implementación que permitan realizar mediciones en forma directa con un panel solar son muy importantes para la toma de conciencia del estudiante ante las energías renovables. El problema de determinar la eficiencia de las celdas fotovoltaicas representa una oportunidad para el desarrollo de prácticas de laboratorio de este tipo. Este artículo describe las características de un mini panel solar fotovoltaico midiendo la relación entre la densidad de corriente y el voltaje (J-V) usando una carga resistiva variable lo que también permite determinar el punto de máxima potencia del mini panel solar. Tanto el problema como su solución son tratados desde un enfoque pedagógico mediante el uso de gráficas, planillas y el modelo de diodo simple, de manera que se motive a los estudiantes de Licenciatura en Química e Ingeniería a desarrollar proyectos en energías renovables.
El origen de COVID-19: lo que se sabe, lo que se supone y (muy poquito) sobre las teorías de complot
Authors: Domínguez Dueñas Laura , Amador-Bedolla Carlos
Published: April 2020

COVID-19 paraliza al mundo al empezar 2020. Por otro lado, la desinformación y/o la mala información alrededor del virus es abundante y dinámica. Desde el inicio del brote del virus SARS-CoV-2 en Wuhan, China se ha discutido una gran cantidad de información acerca del origen del virus. Una de las que llama más la atención es la “teoría del complot”, que propone al hombre como el creador del virus con un objetivo macabro.  Hoy, gracias a la química, a la bioquímica y a las ciencias computacionales sabemos con bastante certeza cómo se originó el virus, salvo por algunos detalles menores. En esta revisión se describen dos características de la proteína spike del virus SARS-CoV-2 que le sirven para establecer el primer contacto y la entrada a las células de humano, y que le sirvió a la comunidad científica para estudiar el parentesco y la filogenia del virus y así definir su origen.
Los sistemas de gestión de las sociedades mercantiles en la Sevilla de los siglos XVIII y XIX
Authors: Jimeno Borrero Jesús
Published: April 2020

La administración de la compañía es un aspecto fundamental del contrato de sociedad. El presente artículo analiza mediante las cláusulas de las escrituras sociales, la legislación y la doctrina, la forma en la que se desarrolla durante un periodo histórico de especial importancia: la evolución desde la cultura jurídica del ius mercatorum hacia el régimen liberal y codificador del derecho mercantil. El sistema más característico es la gestión colectiva, matizada con diferentes cláusulas limitativas, subdividida en tres formas diferentes: disyuntiva, conjunta y repartida. El sistema de administración individual goza en la Sevilla de entre siglos de gran predicamento con independencia de la tipología social. La coadministración introducida por el Código de Comercio de 1829 no encuentra reflejo en la práctica sevillana.
Roscio y el Colegio de Abogados de Caracas. Un caso para entender el cambio de mentalidad a comienzos del siglo XIX
Authors: Pérez Perdomo Rogelio
Published: April 2020

Juan Germán Roscio fue una de las figuras clave para entender el porqué de la desaparición del Colegio de Abogados de Caracas en el siglo XIX, así como los retos a los que una persona se enfrentaba si aspiraba a ser abogado. La controversia que existió entre el Colegio de Abogados y Roscio ejemplifica la importancia del método argumentativo para dirimir un conflicto.
Violencia y autoridad en la escuela secundaria
Authors: Patierno Nicolás
Published: April 2020

El presente artículo es resultado de una investigación doctoral desarrollada entre los años 2011 y 2018, enfocada al estudio de lo que popular —y peligrosamente— se conoce como “violencia escolar”. La hipótesis que orienta este escrito supone que las expresiones juveniles que muchos educadores consideran “violentas” no son arrebatos cuyas causas puedan atribuirse únicamente a un individuo, sino que, en general, son manifestaciones (con un fuerte contenido “físico”), consecuencia de la autorregulación juvenil que sucede a la indiferencia de los adultos. El desarrollo de esta conjetura se sustenta sobre dos fuentes de información: una serie de entrevistas realizadas a docentes y alumnos de escuelas secundarias, y una minuciosa revisión de bibliografía especializada. Las conclusiones reivindican el lugar de la educación secundaria en el proceso de renuncia a la violencia, es decir, en la construcción de lazos sociales, el reconocimiento de un orden simbólico y el uso responsable del cuerpo.
El que con niñas se acuesta… denunciado amanece. Caracterización de las relaciones impropias en Costa Rica durante el periodo 2000-2018
Authors: Porras-Solís Ángel Jesús , Rodríguez-Soto Maritza , Solís-Bastos Laura , Contreras-Castro Kimberley
Published: April 2020

En Costa Rica fue aprobada la Ley 9406 en noviembre de 2016, conocida como «Ley de relaciones impropias»; estas son definidas por un vínculo de pareja marcado por las diferencias amplias de edades entre sus miembros. Mediante el análisis de los datos disponibles para el periodo 2000-2018, se llevó a cabo una revisión de fuentes de información, como las estadísticas de nacimientos y matrimonios, obtenidas en el sistema de consulta de indicadores del Instituto Nacional de Estadística y Censos (INEC), mediante REDATAM 7.

Este artículo aborda este fenómeno desde dos aristas: las uniones mediante el matrimonio y los embarazos adolescentes; en ambos casos, al filtrar la información disponible a partir de la identificación de una relación impropia, permitió caracterizar el comportamiento durante el periodo de estudio, lo que muestra que, una vez aplicadas medidas políticas, es posible incidir en las estadísticas de población. Sin embargo, se debe destacar que las estadísticas podrían tener limitaciones en tanto la cobertura de recolección de datos sobre este fenómeno podría estar siendo ocultada, u omitida, como una medida de protección por las adolescentes al momento de su declaración.
Uso de espacios virtuales de aprendizaje en el fortalecimiento de competencias para la formulación del proyecto de vida en contextos de conflicto escolar
Authors: Anave-Sepúlveda Diana Karely
Published: April 2020

La incorporación de un laboratorio virtual entre los estudiantes de educación básica secundaria permite trabajar dentro del contexto colombiano el fortalecimiento del proyecto de vida de manera  innovadora, atractiva e interactiva entre estudiantes, docentes y padres de  familia. Se trata de una vía que favorece la disminución de los altos niveles de conflicto escolar que representa una alternativa mediadora y preventiva frente a las amenazas y los riesgos a los que están expuestos los alumnos en edad preadolescente. Este estudio es de naturaleza descriptiva cuantitativa. Para la recogida de los datos se aplicó un instrumento de escala tipo Likert mediante el cual se evalúan  los aspectos relacionados con el contexto educativo, el contexto socio afectivo del estudiante y el nivel de desarrollo de competencias TIC. Los ítems versaron sobre la formación y ejecución del proyecto de vida por parte de los estudiantes.  Los resultados permiten detectar las fortalezas, debilidades, amenazas y oportunidades que se sintetizan en una matriz DOFA. Los hallazgos permiten incluir nuevos actores  y acciones con el fin de seguir apoyando y orientando  a los estudiantes a fin de impactar positivamente sus proyectos, clarificando y fortaleciendo sus metas en función de los recursos educativos y socioafectivos de los cuales dispone.
La pasión de aprender: Un estudio correlacional entre los estilos de aprendizaje y el rendimiento académico
Authors: Redondo Remolina Jesús Yamid
Published: April 2020

El objetivo de este trabajo investigativo es analizar qué tipo de relación existe entre los estilos de aprendizaje y el rendimiento académico en las pruebas saber 11, en los estudiantes de educación media de la ciudad de Cúcuta. Esta investigación se ubica dentro del paradigma positivista con un enfoque cuantitativo y diseño descriptivo correlacional, se utilizó el instrumento Cuestionario Honey-Alonso De Estilos De Aprendizaje (CHAEA) y el rendimiento académico se midió con los resultados de las pruebas saber 11. La muestra fueron 133 estudiantes del grado 11, pertenecientes a las mejores instituciones oficiales de la ciudad, jornada de la mañana (categoría A+). Como conclusión se determina que el estilo activo presenta una asociación significativa, de carácter negativo, con el rendimiento académico en las pruebas saber 11, de sociales y ciencias naturales a un nivel de significancia de 0,05 (bilateral). Por otra parte, el rendimiento académico en la prueba de ciencias naturales, presenta asociación significativa, con el estilo de aprendizaje reflexivo y teórico, con un nivel de significancia de 0,01 y 0,05 respectivamente. Se recomienda analizar otras variables posiblemente influyentes en el desempeño académico, como la motivación, prácticas pedagógicas entreotras.
Factores que influyen en el desempeño escolar de los estudiantes de Básica Primaria de una institución educativa del área metropolitana de Cúcuta
Authors: Contreras Ramirez Paris Jessica Viviana , Ramírezparis Colmenares Xiomara , Hernández Vergel Viviana Karina
Published: April 2020

Se presentan los resultados de experiencia terapéutica realizada en una institución educativa ubicada en zona vulnerable de la ciudad de Cúcuta, donde se identificaron las necesidades en los escolares y establecieron estrategias de los procesos de enseñanza- aprendizaje facilitando el desempeño escolar funcional. Se analizan las listas de chequeo basadas en la escala de desarrollo y parámetros de remisión de Terapia Ocupacional de 164 estudiantes de Transición a Quinto primaria y sus profesores titulares, mediante la ejecución de actividades y juegos dirigidos. El análisis versa sobre la secuencia de desarrollo, la ejecución escolar en relación con la tarea, actitud del escolar y trabajo en equipo. Los resultados arrojan dificultades en el desempeño, habilidades de seguimiento de instrucciones y procesos atencionales; asimismo, influencia de los procesos de enseñanza- aprendizaje y ambiente.