bluuebunny/crossref_metadata_2025 huggingface dataset:
MATHEMATICAL MODEL OF HEAT EXCHANGE IN ELEMENTS OF DIGITAL DEVICES
Authors:   Lviv Polytechnic National University, Lviv, Ukraine, Havrysh Havrysh , W. Yu. W. Yu. ,   Lviv Polytechnic National University, Lviv, Ukraine
Published: June 2021

A mathematical model of heat exchange analysis between an isotropic two-layer plate heated ba point heat source concentrated on the conjugation surfaces of layers and the environment has been developed. To do this, using the theory of generalized functions, the coefficient of thermal conductivity of the materials of the plate layers is shown as a whole for the wholesystem.Given this, instead of two equations of thermal conductivity for each of the plate layers and the conditions of ideal thermal contact, one equation of thermal conductivity ingeneralized derivatives with singular coefficients is obtained between them. To solve the boundary value problem of thermal conductivity containing this equation and boundary conditions on the boundary surfaces of the plate, the integral Fourier transform was used and as a result an analytical solution of the problem in images was obtained. An inverse integral Fourier transform was applied to this solution, which made it possible to obtain the final analytical solution of the original problem. The obtained analytical solution is presented in the form of an improper convergent integral. According to Simpsons method, numerical values of this integral are obtained with a certain accuracy for given values of layer thickness, spatial coordinates, specific power of a point heat source, thermal conductivity of structural materials of the plate and heat transfer coefficient from the boundary surfaces of the plate. The material of the first layer of the plate is copper, and the second is aluminum. Computational programs have been developed to determine the numerical values of temperature in the given structure, as well as to analyze the heat exchange between the plate and the environment due to different temperature regimes due to heating the plate by a point heat source concentrated on the conjugation surfaces. Using these programs, graphs are shown that show the behavior of curves constructed using numerical values of the temperature distribution depending on the spatial coordinates. The obtained numerical values of temperature indicate the correspondence of the developed mathematical model of heat exchange analysis between a two-layer plate with a point heatsource focused on the conjugation surfaces of the layersand the environment, the real physical process.
LEARNING A COMBINED MODEL OF TIME SERIES FORECASTING
Authors:   Uzhhorod National University, Uzhhorod, Ukraine, Geche F. E. , Mulesa O. Yu. ,   Uzhhorod National University, Uzhhorod, Ukraine, Batyuk A. Ye. ,   Lviv Polytechnic National University, Lviv, Ukraine, Smolanka V. Yu. ,   Uzhhorod National University, Uzhhorod, Ukraine
Published: June 2021

The method of construction of the combined model of forecast ing of time series based on basic models of forecasting is developed in the work. The set of basic models is dynamic, ie new prediction models can be included in this set. Models also can be deleted depending on the properties of the time series. For the synthesis of a combined model of forecasting time series with a given forecast step, the optimal step of prehistory is determined at the beginning. Next the functional is constructed. The optimal prehistory step is determined using the autoregression method for a fixed forecast step. It determines the period of time at which the accuracy of models from the base set is analyzed. For each basic model during the process of the construction of the combined model is determined by the weighting factor with which it will be included in the combined model. The weights of the basic models are determined based on their forecasting accuracy for the time period determined by the prehistory step. The weights reflect the degree of influence of the base models on the accuracy of the combined model forecasting. After construction of the combined model, its training is carried out and those basic models which will be included in the final combined model of forecasting are defined. The rule of inclusion of basic models in the combined model is established. While including basic models in the combined forecasting model, their weights are taken into account, which depends on the same parameter. The optimal value of the parameter is determined by minimizing the given functional, which sets the standard deviation between the actual and predicted values ​​of the time series. Weights with optimal parameters are ranked in decreasing order and are used to include basic models in the combined model. As a result of this approach, as predicted values for the real time series show, it was possible to significantly improve the forecasting accuracy of the combined model in many cases. The developed method of training provides the flexibility of the combined model and its application to a wide class of time series. The results obtained in this work contribute to solving the problem of choosing the most effective basic models by synthesizing them into one combined model.
STACKING OF THE SGTM NEURAL-LIKE STRUCTURE WITH RBF LAYER BASED ON GENERATION OF A RANDOM CURTAIN OF ITS HYPERPARAMETERS FOR PREDICTION TASKS
Authors:   Lviv Polytechnic National University, Lviv, Ukraine, Tkachenko R. O. , Izonіn I. V. ,   Lviv Polytechnic National University, Lviv, Ukraine, Danylyk V. M. ,   Lviv Polytechnic National University, Lviv, Ukraine, Mykhalevych V. Yu.
Published: June 2021

Improving prediction accuracy by artificial intelligence tools is an important task in various industries, economics, medicine. Ensemble learning is one of the possible options to solve this task. In particular, the construction of stacking models based on different machine learning methods, or using different parts of the existing data set demonstrates high prediction accuracy of the. However, the need for proper selection of ensemble members, their optimal parameters, etc., necessitates large time costs for the construction of such models. This paper proposes a slightly different approach to building a simple but effective ensemble method. The authors developed a new model of stacking of nonlinear SGTM neural-like structures, which is based on the use of only one type of ANN as an element base of the ensemble and the use of the same training sample for all members of the ensemble. This approach provides a number of advantages over the procedures for building ensembles based on different machine learning methods, at least in the direction of selecting the optimal parameters for each of them. In our case, a tuple of random hyperparameters for each individual member of the ensemble was used as the basis of ensemble. That is, the training of each combined SGTM neural-like structure with an additional RBF layer, as a separate member of the ensemble occurs using different, randomly selected values of RBF centers and centersfof mass. This provides the necessary variety of ensemble elements. Experimental studies on the effectiveness of the developed ensemble were conducted using a real data set. The task is to predict the amount of health insurance costs based on a number of independent attributes. The optimal number of ensemble members is determined experimentally, which provides the highest prediction accuracy. The results of the work of the developed ensemble are compared with the existing methods of this class. The highest prediction accuracy of the developed ensemble at satisfactory duration of procedure of its training is established.
SYNTHESIS OF IMAGES-ORNAMENTS
Authors:   West Ukrainian National University, Ternopil, Ukraine, Berezka K. M. , Berezsky O. M. ,   ernopil National University, Ternopil, Ukraine; Lviv Polytechnic National University, Lviv, Ukraine
Published: June 2021

The article developed the mathematical model for the synthesis of ornamental images and implemented the software editor of ornamental images, based on symmetry theory. The paper shows the fundamental role of symmetry. It is analyzed that the symmetry theory methods are used in physics, chemistry, biology, and engineering. It was found that symmetry is based on transformation and storage. In addition, the symmetrical system is based on a set of invariants that are built according to certain rules. It is shown that the symmetry of borders and the symmetry of mesh ornaments are used in ornaments. The synthesis of ornamental images is considered on the example of Ukrainian folk embroidery. The contribution of foreign and domestic scientists to the development of the symmetry theory and synthesis of images is analyzed. It is indicated that Ukrainian folk embroidery is the valuable property of the cultural and material heritage of people and an important source of research. It is analyzed that there are more than 100 types of different embroidery techniques. The role of famous Ukrainian artists in the popularization and organization of Ukrainian folk embroidery museums is presented. It is investigated that embroidery is built from separate motives or from ornaments. Ornaments consist of sub-ornaments. A sub-ornament is a pattern consisting of rhythmically ordered identical elements (built on one group transformation). Subornaments are divided into reports. The report is called the minimum for the area of the area that can cover the sub-ornament, using only transfers. The report, in turn, is divided into even smaller particles: motive or elementary picture. It is found that in embroidery ornaments there are 7 groups of stripe and 12 - plan. Mathematical models of images-ornaments synthesis for groups of a strip and plan groups are developed. Mathematical models are given for ideal ornaments. If offsets of axes or centers of symmetries, it is necessary to adjust the coefficients of transformation matrices displacement. Samples of embroidered ornaments of the corresponding plane and stripe groups are provided. Editor of image-ornaments has been developed, which allows the synthesis of complex ornamental images based on analytical formulas of elementary picture, sub-ornament, and ornament. Examples of real and synthesized samples of Ukrainian folk embroidery are provided. The scientific novelty of the work lies in the development of mathematical models of ornaments on the basis of symmetry groups on the strip and the plane. The practical value of the work lies in the development of an image editor-ornaments.
SYNTHESIS OF BARKER-LIKE SEQUENCES WITH ADAPTATION TO THE SIZE OF THE INTERFERENCE
Authors:   Lviv Polytechnic National University, Lviv, Ukraine, Tsmots I. G. , Riznyk O. Ya. ,   Lviv Polytechnic National University, Lviv, Ukraine, Budaretskyi Yu. I. ,   Hetman Petro Sahaidachnyi National Army Academy, Lviv, Ukraine, Oliinyk M. Ya. Oliinyk M. Ya. ,   Hetman Petro Sahaidachnyi National Army Academy, Lviv, Ukraine
Published: June 2021

The method of synthesis of noise-resistant barker-like code sequences with the use of ideal ring bundles has been improved. The method for fast finding of such noise-like noise-resistant code sequences, which are able to find and correct errors in accordance with the length of the obtained code sequence, has been improved. An algorithm is implemented to quickly find such noise-resistant barker-like code sequences that are able to find and correct errors in accordance with the length of the obtained code sequence. A simulation model of noise-tolerant barker-like coding with the use of ideal ring bundles has been developed. The possibility of reducing the redundancy of noise-tolerant code sequences by cutting code sequences by a certain number of bits without losing the regenerative capacity of noise-tolerant codes has been investigated. Theoretical analysis of the possibilities of this approach and its effectiveness is performed. Several series of experimental studies of the reliability of the described method on different data samples were performed and its functional efficiency was confirmed. The analysis of the obtained data and identification of key factors influencing the result is carried out. The practical software implementation of the simulation model of noise-tolerant barker-like coding for finding and correcting errors in the obtained noise-tolerant barker-like code sequences is carried out. The used methods and algorithms of data processing, the main components for message processing and their purpose are described. The possibility of reducing the redundancy of noise-tolerant code sequences by reducing the code sequences by a certain number of bits without losing the reproducibility of noise-tolerant codes has been investigated. Theoretical analysis of the possibilities of this approach and its effectiveness is performed. Several series of experimental studies of the reliability of the described method on different data samples were performed and its functional efficiency was confirmed. The analysis of the obtained results is performed and the main factors influencing the obtained result are determined. The proposed noise-tolerant barker-like code sequences have practical value, because with the help of the obtained barker-like code sequence it is quite simple and fast to find up to 50 % and correct up to 25 % of distorted characters from the length of noise-tolerant barker-like code sequence.
IMPROVED ALGORITHM FOR THE PACKET ROUTING IN TELECOMMUNICATION NETWORKS
Authors:   Lviv Polytechnic National University, Lviv, Ukraine, Liskevych R. I. , Liskevych O. I. ,   Lviv Polytechnic National University, Lviv, Ukraine, Obelovska K. M. ,   Lviv Polytechnic National University, Lviv, Ukraine, Panchyshyn R. P. R. P. ,   Lviv Polytechnic National University, Lviv, Ukraine
Published: June 2021

Packet routing efficiency is and will remain one of the major factors that have a major impact on a network performance and a quality of service. One of the most common routing protocols used in autonomous Internet systems is the Open Shortest Path First (OSPF) protocol. The OSPF protocol performs packet transmission using the shortest paths, calculated according to a certain, but only one criterion. Default criterion is channels bandwidth, but in general any criteria can be selected. The disadvantage here is that channels loading is not considered and thus packets are routed to a shortest but potentially overloaded path. In wider sense usage of single criteria may results in routing through paths suboptimal or even inappropriate by other criteria. The growth of the network traffic, and especially the increase of its multimedia component drives continuous improvement of routing methods in existing telecommunication networks. Network performance will benefit from more advanced routing methods, which would take into account several network characteristics, important for specific services quality. In given work a new algorithm of a gateway selection for the routing tables of autonomous Internet systems is proposed. The algorithm is based on the OSPF protocol but takes into account three criteria: channel bandwidth, the number of intermediate nodes in the path and the signal propagation delay. Weighting coefficient for each criteria is introduced. Besides that, the integral criterion is proposed based on optimal path weights for individual criteria and path weights found by two other criteria. The total relative deviation of the path weight from the path weights calculated according to individual criteria is used as the optimization criterion. The purpose of optimization is to minimize this deviation. Routing tables constructed using proposed algorithm ensure packets transmission through the optimal path, selected according to the integral criterion, taking into account the three criteria and their coefficients of importance. Further research may be conducted to expand the list of criteria used in the optimization process.
TULOSSA Marin ja permiläisten kielten etymologista tutkimusta
Authors: Metsäranta Niklas
Published: June 2021

Niklas Metsärannan suomalais-ugrilaisen kielentutkimuksen alaan kuuluva väitöskirja tarkastettiin Helsingin yliopistossa lauantaina 12. joulukuuta 2020. Vastaväittäjänä toimi professori Ante Aikio Saamelaisesta korkeakoulusta ja kustoksena professori Janne Saarikivi.

Niklas Metsäranta: Periytyminen ja lainautuminen: Marin ja permiläisten kielten sanastontutkimusta. Helsinki: Helsingin yliopisto.

Kirja on luettavissa osoitteessa http://urn.fi/URN:ISBN:978-951-51-6870-2
Kenttätutkijakonkarin valinnat
Authors: Mustanoja Liisa
Published: June 2021

Arvioitu teos:
Erkki Lyytikäinen: Sehän on murretta! Helsinki: Gaudeamus 2020. 248 s. isbn 978-952-060-8.
Kielen oppimisen ekologiaa
Authors: Dufva Hannele
Published: June 2021

Arvioitu teos:
Minna Intke-Hernandez: Maahanmuuttajaäitien arjen kielitarinat. Etnografinen tutkimus kieliyhteisöön sosiaalistumisesta.Kasvatustieteellisiä tutkimuksia103. Helsinki: Helsingin yliopisto 2020. Johdanto 112 s. + 4 artikkelia. isbn 978-951-51-6837-5.
Johdanto-osa saatavillaverkossa osoitteessa http://urn.fi/URN:ISBN:978-951-51-6838-2.
Suomalaisuuden ja venäläisyyden kohtaaminen henkilönnimistössä
Authors: Eskola Ksenia
Published: June 2021

Ksenia Eskolan suomen kielen alaan kuuluva väitöskirja tarkastettiin Helsingin yliopistossa lauantaina 10. huhtikuuta 2021. Vastaväittäjänä toimi dosentti Sirkka Paikkala ja kustoksena Jyrki Kalliokoski. 
Ksenia Eskola: Suomalaisuus ja venäläisyys henkilönnimistössä. Nimikulttuurien kohtaaminen Suomessa ja Venäjällä 2000–2018. Helsinki: Helsingin yliopisto 2021.
Väitöskirja on luettavissa osoitteessa http://urn.fi/URN:ISBN:978-951-51-6852-8.
The Influencing Factors on the Employees' Cooperation of Private Sector
Authors:   Cihan University-Erbil  Erbil, Kurdistan Region - Iraq, Raewf Manaf , Mahmood Yazen ,   Knowledge University  Erbil, Kurdistan Region - Iraq, Jaafar Ali ,   Cihan University-Erbil  Erbil, Kurdistan Region - Iraq
Published: June 2021

This paper focuses on the importance of the employees' cooperation at any workplace, and how the cooperation effects on making a successful or failure organization by examining the relationship between the influencing factors and employees' cooperation, providing recommendations for organization managers, and presenting a theoretical background of the influencing factors and employees' cooperation. The statistical package for social science (SPSS) was used to analyze the data which are obtained from the distributed questioner for 30 employees of Alen Company in Erbil. The researchers conclude that the existence of the team spirit and cooperative leadership help in implementing a cooperative management by the staff even if it is in certain level, and they recommend to the need of strengthening the power and facilities of staff in the term of managing and authority and increasing the cooperative behavior among the staff and the management in term of issues that relate to organization's management.
The probiotic potential and evaluation of the safety aspects of Enterococcus sp. strains isolated from traditionally made Serbian cheese
Authors:   Department of Biology and Ecology, Faculty of Science, University of Kragujevac, Kragujevac, Republic of Serbia, Grujović Mirjana Ž. , Mladenović Katarina G. , Čomić Ljiljana R.
Published: June 2021

The purpose of this research paper was the evaluation of the safety aspects and probiotic potential of six isolates from the genus Enterococcus isolated from traditionally made cheese. The isolates represented part of the unexplored microflora of the cheese. The tolerance of Enterococcus isolates to different gastrointestinal conditions (low pH, the presence of pepsin, pancreatin and bile salts) were investigated. Using the microdilution method, sensitivity to clinically relevant antimicrobial agents (tetracycline, ampicillin, gentamicin, vancomycin and polymyxin B) was evaluated. The adhesion ability of autochthonous Enterococcus isolates to solvents, as well as the ability of auto-aggregation and co-aggregation between them and Escherichia coli clinical isolates, was investigated. The results indicated that isolates showed tolerance to the simulated gastrointestinal condition in a high percentage. Isolates were sensitive to all the tested antibiotics, especially to ampicillin, with MIC values obtained from 0.19-2.5 μg/mL. The isolates showed the ability of growth in medium with phenol and showed no ability to synthesize histamine and tyramine. The highest percentage of adhesion was detected with chloroform, and the lowest with xylene. The isolates showed moderate auto-aggregation ability, while a different degree of co-aggregation with E. coli was observed. The results indicated that the potential application of investigated Enterococcus isolates is selective and limited.
Short-term changes in the oral microbiota of dogs after chewing different types of autoclaved bones
Authors:   Department of Animal Science, Universidade Federal do Rio Grande do Sul, Porto Alegre,  Rio Grande do Sul, Brazil, Fredrich Dourado Pinto Caroline , Nunes Pignone Víviam , Kleber Silveira Alexandre , Krebs Giovane , Trevizan Luciano
Published: June 2021

The presence of dental calculus is one of the main issues associated with periodontitis in dogs. Mechanical removal of plaque and dental calculus can be performed through periodic oral prophylaxis conducted by veterinary dentists, and by continuous chewing of various items. Recent studies have demonstrated the effectiveness of bones as dental calculus agent removal in adult dogs. However, their effect regarding removal of oral microbiota remains unknown. The aim of the present study was to evaluate the effect of autoclaved spongy bone (SB) or compact bone (CB) supplementation on the oral microbiota of adult dogs with pre-existing dental calculus. The V4 region of the 16S rDNA gene was used for Illumina MiSeq next-generation sequencing. Transition was observed on the phyla proportion of the SB group, where the saliva sample initially presented a predominance of Bacteroidetes (51.3%) and Proteobacteria (33.0%), and changed to Proteobacteria (52.4%) and Bacteroidetes (33.9%). The gingival sulcus changed from Bacteroidetes (66.7%) and Proteobacteria (17.5%) prior to SB supplementation to Proteobacteria (76.3%) and Bacteroidetes (18.5%). No changes were observed in the proportion of saliva and gingival sulcus phyla in group CB. Moraxella sp. and Bergeyella zoohelcum increased in both saliva and gingival sulcus after SB supplementation. Saliva and gingival sulcus in the CB group showed increases in Porphyromonas species after 13 days’ supplementation. This study showed that chewing SB had a profound impact on both saliva and gingival sulcus microbiota, while CB did not cause substantial changes in the microbiota in either environment.
Phagocytic activity and the phagocytic index of milk PMN’s as a marker for diagnosis and monitoring of the therapeutic and prophylactic efficacy of antioxidant formulation in bovine mastitis
Authors:   Division of Clinical Veterinary Medicine, Ethics and Jurisprudence, Faculty of Veterinary Sciences and Animal Husbandry, Srinagar, Jammu and Kashmir, India, Muhee Amatul , Malik Hamidullah , Bhat Riyaz A. , Taifa Syed , Azad Mehak N. B. , Rather Waseem
Published: June 2021

A clinical study was undertaken on bovine mastitis in the Kashmir valley to study the relationship between Phagocytic activity (PA) and the phagocytic index (PI) of milk neutrophils (PMN’s) and bovine mastitis. The PA and PI of milk PMN’s were assessed in mastitic animals and compared with normal, healthy, lactating animals. A significant decrease was found in the values of the PA and PI of milk neutrophils in clinical cases of mastitis as compared to the healthy control group. The utility of anti-oxidants in clinical management of mastitis was measured through the response to treatment with trace minerals such as Cu, Zn, Mn and Se in addition to conventional antibiotic therapy. Two groups of mastitic animals received two therapeutic regimens. Group I animals received antibiotics (Enrofloxacin 6.6 mg/kg BID for 5 days) and a self-formulated trace mineral anti-oxidant mixture at therapeutic doses for 7 days, while Group II animals only received the antibiotic (at the same dose rate and frequency). Therapeutic regimen I proved more efficacious than the therapeutic regimen II in the treatment of clinical mastitis, as evidenced by higher recovery rates, a lower number of mean days required for recovery, and higher PA and PI of the milk PMN’s on day 10 post treatment. For prophylactic studies, 24 healthy lactating cows were divided into two groups of 12 animals each. One group was supplemented with a self-formulated trace mineral anti-oxidant mixture at prophylactic doses for 30 days, which resulted in a significant improvement in udder health status in terms of the SCC, PA and PI of milk PMN’s. Supplementation with the antioxidant formulation played a significant role in early recovery and prophylaxis of bovine mastitis. Assessment of PA and PI of milk PMN’s could be utilised as an effective tool for diagnosing susceptibility to the occurrence of mastitis, as well as monitoring the therapeutic efficacy of different treatment regimes.
The genotype determination and molecular characterization of bovine leukemia virus in Turkey
Authors:   Department of Virology, Faculty of Veterinary Medicine, Ankara University, Diskapi, Ankara, Turkey, Alkan Feray , Karayel-Hacioglu Ilke , Duran Yelken Selda , Coskun Nuvit
Published: June 2021

Bovine leukemia virus (BLV) infection is widespread worldwide and causes significant economic losses in the livestock industry. In this study, to identify the genotypes and to investigate the molecular characterization of BLV strains, we analyzed 25 BLV strains from cattle housed in six herds located in several Turkish geographical regions. Phylogenetic analysis, based on a partial or full-length sequence of the env gp51 gene of BLVs, showed that all Turkish BLVs belonged to genotype 1. The alignment of the deduced amino acid sequences demonstrated fourteen amino acid substitutions in different regions of the env gp51. This study updates our knowledge of BLV in Turkey. Further studies are needed to understand the molecular epidemiology and implement a comprehensive BLV control program in Turkey.
Guest Editorial Territorial Identities and Heritage. A Constructivist Approach
Authors: ILOVAN Oana-Ramona , ISTRATE Marinela
Published: June 2021

Territorial identity is defined by tangible and intangible features and involves both place attachment and belonging and the politics of territorial planning. When considered as an expression of historical heritage and characteristics, shared by settled collectivities, territorial identity in all its declinations (urban, local, regional, national) can be considered a tool against the current and stronger homogenising effects of globalisation. At the same time, local identity harbours the emotional and symbolic meanings people ascribe to a sense of self and attachment to place. We advocate for a relational, dynamic, and participatory notion of territorial identity, constituted both spatially and socially, challenging the notion of identity as fixed, natural, ahistorical, or rooted in a certain essence. Besides territorial identity, another key concept discussed is landscape, conceived as a social construct and signifying system, in its morphological (i.e. material form) and/or in its ideological or represented aspects. In a certain sense, the following articles can be considered a contribution both to territorial identity and landscape studies, through the lenses of New Cultural Geography, showing how territorial identities are constructed at the intersection of spatial and social relations, embedded in various networks of power. Understanding territorial identities as dynamic products and processes, historically and geographically contingent, formed and enacted, is part of our making sense of the world and planning for a better future.
Does the COVID-19 pandemic affect social-ecological resilience of organic rice production system in Chiang Mai Province, Thailand?
Authors: Panpakdee Chaiteera , Palinthorn Fakjit
Published: June 2021

The purpose of this study was to investigate how the COVID-19 pandemic affects the organic rice production system in four districts of Chiang Mai Province. Eight organic farmers were purposefully chosen as informants because they have possessed forty-seven resilience components (SERCs) needed to cope with all kinds of social-ecological change. They were asked using a structured questionnaire to assign each SERC’s contribution value before and after the COVID-19 pandemic, in which each time scoring must be coupled with entailed explanations. Then, the paired samples t-test was run to compare such means of SERCs’ contribution values to examine whether their organic rice production’s resilience was affected by the pandemic and how. Results showed the means of SERCs before and after the pandemic have no significant difference as the p-value is 1.00 at the 95% confidence interval. This meant the pandemic does not influence the organic rice production’s social-ecological resilience. But several practices and qualifications were found varying from the original to make production more suitable. The dependence on household labor and that on mutual labor exchange were respectively increased and decreased in their roles in resilience building. Labor availability was interrupted by the social distancing protocol that had restricted people from gathering. Besides, the household accounts recording was adopted more than usual for being seen as a solution to improving the household economy during the time of financial vulnerability. Importantly, relying on local goods was remarkably recognized for increased importance. This was an attempt to get access to materials possibly free from the COVID-19 contamination because of the absent transportation. These findings provide two key interests. They can be applied as a framework not only to strengthen agricultural resilience but also to propose a blueprint of coping mechanisms against the pandemic at a mass scale.
Preservice Teacher Perspectives on Learning with Technology: Modeling Vulnerability and Embracing Innovation
Authors: Smith Rebecca
Published: June 2021

This mixed methods study examined preservice teacher perspectives on the impact of using untethered lecture capture (ULC) as an instructional technology in a teacher preparation course, both on learning experiences as students and confidence using technology as teachers. Results found statistically significant (p < .05) increases in confidence using technology as a teaching tool. Additionally, Darling-Hammond et al.'s (2018) Teacher Preparation for Deeper Learning framework was utilized to analyze qualitative data to explore the impact of ULC on preservice teacher learning. Challenges and recommendations for effective implementation of ULC, based on participant feedback, are provided. This study contributes to research on using technology in teacher preparation programs to enhance the teaching and learning process for preservice educators and is grounded in the TPACK model (Mistra & Koehler, 2009).
Analysis of Transient Natural Convective Flow of a Nanofluid in a Vertical Tube
Authors: Jha Basant K. , Chitumu Ali J. , Oni Michael O.
Published: June 2021

An analysis into the transient natural convective flow of a nanofluid in a vertical tube is made. The governing equations of momentum, heat transfer and nanoparticle volume fraction are deduced, and the influence of the thermophoresis parameter and Brownian motion is incorporated. By direct integration and variation of the parameter, analytical solutions are obtained for flow formation and heat/mass transfer at steady-state. On the other hand, due to the complexity of same problem at transient state, a numerical solution is used to solve the discretized equations of motion using the implicit finite difference technique. The influence of the thermophoresis parameter and Brownian motion is noted and well discussed. For accuracy check, a numerical comparison is made between the steady state and transient state solution at large time; this comparison gives an excellent agreement. The role of various principal parameters on velocity profile, temperature, concentration of nanoparticles, Sherwood and Nusselt numbers are presented graphically and well discussed. It is noted that the buoyancy ratio decreases the fluid velocity significantly.
Reflection-Refraction Coefficients and Energy Ratios in Couple Stress Micropolar Thermoviscous Elastic Solid
Authors: Sahrawat Ravinder Kumar , Poonam
Published: June 2021

The reflection and refraction phenomenon of propagation of waves in couple stress micropolar thermoviscous elastic solid media with independent viscoelastic and micropolar properties have been studied. The structure of the model has been taken such that the plane interface is divides the given media into two half spaces in perfect contact. Here, we find that there are five waves, one of them is propagating independently while others are set of two coupled waves travelling with different speeds. Energy ratios, reflection and refraction coefficients relative to numerous reflected and refracted waves have been investigated when set of two coupled longitudinal waves and set of two coupled transverse waves strike at the interface through the solid medium. The inequality of energy ratios, refraction coefficients and reflection coefficients are evaluated numerically and presented graphically under three theories of thermoelasticity, namely, Green-Lindsay theory (GL), Lord-Shulman theory (LS), Coupled theory (CT) versus angular frequency and angle of incidence.
Modelling of Equivalent Mass and Rigidity of Continual Segment of the Inter-Resonance Vibration Machine
Authors: Lanets O.S. , Dmytriv V.T. , Kachur O.Yu. , Derevenko І.A. , Novitskyi Yu.Ya. , Horodetskyy І.М.
Published: June 2021

The article deals with a continual segment of an inter-resonance vibration machine. In the form of a solid with distributed parameters this segment combines two defining parameters, namely: the inertial parameter of reactive: masses and appropriate rigidity of elastic coupling. These operation factors are revealed only in dynamic processes and are clearly not included in the parameters of the continual segment. Analytical dependences are developed for modeling of defining parameters of an inter-resonance system, namely: reactive mass and appropriate rigidity of elastic: coupling. Parameters of the reference point of the continual segment passing through its center of velocity are studied. The inertial parameter of the reactive mass and the rigidity of elastic coupling were modeled by the Rayleigh-Ritz method. The reliability of the results of theoretical research was confirmed experimentally and the parameters of the partial frequency of the continual segment were determined.
Convective Flow of Hydromagnetic Couple Stress Fluid with Varying Heating through Vertical Channel
Authors: Makhalemele C.R. , Rundora L. , Adesanya S.O.
Published: June 2021

This article addresses the impact of magnetic field induction on the buoyancy-induced oscillatory flow of couple stress fluid with varying heating. Modelled equations for the incompressible fluid are coupled and nonlinear due to the inclusion of viscous heating and thermal effect on the fluid density. Approximate solutions are constructed and coded on a symbolic package to ease the computational complexity. Graphical representations of the symbolic solutions are presented with detailed explanations. Results of the present computation show that the effect of induced magnetic field on the oscillatory flow and heat transfer is significant and cannot be neglected.
Identifying and Prioritizing Ways to Improve Oman’s Tourism Sector in the Corona Period
Authors: Al-Hasni Zakiya Salim
Published: June 2021

Objectives: To identify the economic, social, and geopolitical impacts of the Corona pandemic on the country’s tourism industry; to identify ways to enhance domestic tourism so as to increase income in the Oman’s tourism industry which has since been declining; to identify specific travel destinations and associated recovery plans; and to suggest recommendations on the best approaches to improving the Oman tourism sector.

Methodology: The research involved collection of primary data using interviews where opinions and perceptions of Omani tourism industry experts were collected regarding economic, social, and geopolitical impacts of the Corona pandemic on the country’s tourism industry; the rationale of lifting travel restrictions and the ways of increasing traveller confidence amidst the uncertainties and fears associated with Covid-19 in Oman; ways to enhance domestic tourism so as to increase income in the Oman’s tourism industry which has since been declining; and recommendations on the best approaches to improving the Oman tourism sector.

Findings: The main impacts of coronavirus on Omani tourism industry include loss of revenue and reduction in hotel and occupancy rate. These effects resulted into massive job losses, unpaid leave and pay cuts amongst employees in the country’s tourism industry. The measures to be taken to enhance recovery of the tourism industry were categorized into two: government measures and business measures.

Value added: With the multiple adverse effects of the coronavirus pandemic on the tourism sector, this study will help in establishing the potential measures of fostering the positive outcomes in the sector.

Recommendations: Setting aside COVID-19 recovery financial kitty; Increasing the frequency of marketing the country as the preferred and the best tourist destination in the world in both local and international media; Public-private partnerships; and encouraging domestic tourism by offering discounts and incentives for the locals enjoying the country’s tourism facilities. Offering discounted rates and fees; adopting a flexible booking policy; cancelling or waiving all the fees and fines that were charged on customers who cancelled or amended their bookings as result of COVID-19 pandemic; offering attractive discounts to clients who want to re-book their previous cancelled bookings without conditions; and diversification of operations.
The Evolution of the Italian Framework to Measure Well-Being
Authors: Bacchini Fabio , Baldazzi Barbara , De Carli Rita , Di Biagio Lorenzo , Savioli Miria , Sorvillo Maria Pia , Tinto Alessandra
Published: June 2021

Recently, a new approach for measuring well-being was developed by eighteen European countries in the wake of the “Beyond GDP movement” started in the 1990 and continued by the Stiglitz Commission. Among these European economies, eleven of them use measures of well-being for monitoring public policy. The Italian Statistical Institute (Istat) jointly with the National Council for Economics and Labor (CNEL) developed a multi-dimensional framework for measuring “equitable and sustainable well-being” (Bes) and since 2013 Istat publishes an annual report on well-being. The Bes framework is continuously updated to take into account new challenges: the exploitation of new data sources, to produce better indicators; new ways for making the communication more effective and foster public awareness; the inclusion of well-being indicators in the budget documents, as established by law. Especially for the latter, the Italian Bes can be considered a forerunner and, more generally, the Italian experience is one of the most relevant at the European level, showing potential of become a benchmark for other countries. This article illustrates the development of the Italian Bes, focusing on its recent progresses and challenges.
Nesting and breeding attempts of Cecropis daurica (Laxmann, 1769) in Tunisia
Authors: Kalboussi Mohsen
Published: June 2021

During fieldworks in 2019, a pair of Red-rumped Swallows (Cecropis daurica) were seen building their nest (June) and one of them brooding (August). The pair was still present in the area by the end of September, while all other swallows left this breeding area. In June 2020, the nest entrance was destroyed and the nest was occupied by a pair of Passer sp. Another nest of C. daurica was found in an abandoned building but was completely destroyed. This observation is the first record concerning an attempt and failure of nesting of the species in Tunisia. The nesting area of the Red-rumped Swallow is extended to the Mediterranean in southern Europe and to northwest Africa. The nesting sites are described, and the extension of the nesting area is discussed in this work.
Risk Management in Business Valuation in the Context of Digital Transformation
Authors: Pupentsova Svetlana V. , Gromova Elizaveta A.
Published: June 2021

The paper deals with business valuation in unstable conditions of the external environment. Economic recession and the need for digital transformation is coming to the fore in Russia. As a result of this, the valuation of assets and business acquires additional complexity and issues related to effective risk assessment become relevant. The main objective of this paper is to offer non-traditional methods of risk assessment for business valuation at the moment. The qualitative and quantitative risk analysis will help to improve the quality of the assessment reports of the property in an unstable period. The paper focuses on the non-traditional methods of risk assessment (Monte Carlo method, game theory) which must be used in determining the market value of the object of assessment in the current time. A practical example of using the simulation modeling method is given in detail. Summarizing, the use of the simulation modeling method for calculating the market value of the appraisal object will provide additional (compared to the standard method) information and increase the reliability of the results. Moreover, in the period of the coronavirus pandemic, this paper becomes even more relevant and important, seeing as how uncertainty is becoming inherent in countries around the world. Thus, this study is of value to researchers in the field of economic modeling and appraisers across the globe.
Construction of Ideal Remote Assessment Environments and the Impact of Self-Selected Music on Student Performance
Authors: Tsang Joshua K. C. , Wilby Kyle J.
Published: June 2021

Background: Remote online assessments require students to construct their own assessment environments, including selection of strategies (such as the use of music) to reduce stress. This study aimed to determine the impact of self-selected music on student performance during a remote online assessment and to identify factors important for constructing ideal assessment environments.
Methods: Final year students were randomized to complete a voluntary remote online 2-hour care plan test. Those randomized to ‘music’ were required to play self-selected music during the assessment and those randomized to ‘non-music’ were asked not to play music. Prior to the assessment, perceived stress and resilience were measured. Performance between groups was compared and associations between stress, resilience, and performance determined. A post-survey identified music preferences/acceptability, and factors identified for ideal remote assessment environments.
Results: A total of 79 students completed the study (n=40 music, n=39 non-music). The median assessment score in the music group was 90% (range 58 to 99%) and 88% (range 58 to 99%) in the non-music group (not significant). No associations were found between scores and perceived stress or resilience. The majority of students randomized to music (62.5%) found it helpful. Thirteen categories of factors were identified to contribute to an ideal remote assessment environment with the most common being lighting, location, quietness, distractions, and seating/set-up.
Conclusion: Findings support the notion that remote online assessment environments should not come as ‘one size fits all’ and many factors (including self-selected music) may influence a student’s ability to perform to a high standard.
El derecho al agua como Derecho Fundamental
Authors: Restrepo John , Aguilar Juan Esteban
Published: June 2021

Hemos sostenido que un derecho adquiere la categoría de “fundamental” en tanto cumpla taxativamente las siguientes condiciones: (i) que haya una concesión normativa; (ii) que consagre una serie de atributos materiales o morales en favor de un sujeto; y (iii) que satisfaga al menos uno de los principios de dignidad, supervivencia o autodeterminación. A partir de estas condiciones nos ocuparemos de analizar si resulta posible hablar o no del derecho al agua como “derecho fundamental”. Este escrito también se propone mostrar la evolución que le ha dado el constituyente, el legislador y la jurisprudencia al agua, primero como un servicio público, luego como un derecho fundamental en conexidad con la dignidad y la supervivencia, y, por último, como un derecho fundamental autónomo susceptible de protección inmediata a través de la presentación de acción de tutela. Sumado a esto, el texto se ocupa de resaltar que  existe una vocación expansiva de los sujetos susceptibles de protección de derechos, pues así como antes se prohibía la suspensión del abastecimiento del líquido vital cuando pudieran verse afectados menores, adultos mayores, reclusos o población seropositiva, también resulta constitucionalmente razonable que tal esfera de protección se prolongue en dirección de asegurar la integridad y protección que mediante el agua limpia y salubre pueda asegurársele a animales domésticos.
El presidente de la república sujeto de juicio político: reforma constitucional al Sistema Político Mexicano
Authors: Garrido Lastra Irvyng
Published: June 2021

El juicio político está dentro del rubro de defensa preventiva de la Constitución que sanciona la conducta de los servidores públicos en el ejercicio de sus funciones incurran en actos u omisiones que redunden en perjuicio de los intereses públicos fundamentales y de su buen despacho. Que a diferencia de cualquier otro medio este se tramita ante el poder legislativo, trabajando de manera conjunta la Cámara de Diputados y la Cámara de Senadores, la primera en forma de órgano instructor, así como de acusador y la segunda actuará como un jurado. Cualquier persona podrá presentar la denuncia, pero hay una omisión constitucional al no contemplar al presidente de la república como sujeto de dicho proceso en donde se busca que los servidores públicos respeten las leyes y no abusen del poder que se les otorga, entonces si es así se debería hacer una reforma al artículo 108 y demás relativos de la Constitución Política de los Estados Unidos Mexicanos en donde se pueda contemplar que el presidente sea juzgado, de ser necesario inhabilitado, y con esto tener una mayor protección al Estado de derecho en México, así como acotar todas aquellos actos contrarios a la ley hechas de manera directa por el presidente de la República que haciendo un mal uso de sus facultades pueda afectar la esfera jurídica del particular o gobernado.