bluuebunny/crossref_metadata_2025_split huggingface dataset:
r-Dynamic Coloring on Snark Families
Authors: Gomathi C.S. , Mohanapriya N. , Dafik D. 
Published: May 2020

Abstract
An r-dynamic coloring of a graph is a proper minimum coloring of the vertices such that

|

c
(
N
(
υ
)
)

|

≥
min
{
r
,
d
e

g
G

(
υ
)
}

, for each

υ
∈
V
(
G
)

and it is denoted by

χ
r

(
G
)

. Snark are bridgeless cubic connected graph in which every vertex has three neighbors. In this paper, we shown the r-dynamic coloring for Celmins-swart snark, Double star snark, Loupekine snark, Szekeres snark, Watkins snark and infinite family of flower snark with its special case as Tietze’s graph. This result reinforce that most of the snark are 6-colorable for its maximum degree and also we give the procedures to construct a r-dynamic coloring of each snark.
Existence of Oscillatory Solutions of Linear First order Neutral Delay Difference Equations
Authors: Jesinthaangel R. , Gomathi Jawahar G. , Daphy Louis Lovenia J. 
Published: May 2020

Abstract
This paper is concerned with the oscillatory behaviour of first order neutral delay difference equation of the form,

Δ

[

w
(
e
)
−
p
(
e
)
w
(
e
−
α
)

]

−
q
(
e
)
w
(
e
−
η
)
=
0
,
α
,
η
>
0

and p(e), q(e) are sequence of non-negative real numbers. Sufficient conditions involving oscillation of all solutions are established. These conditions improve all previous well known results in the literature. Examples illustrating the significance of the results.
a–Domination of Cartesian Product of Path Semigraphs
Authors: Murugesan N. , Narmatha D. 
Published: May 2020

Abstract
In a scientific enquiry it is common to study the behaviour of combined systems after studying the systems individually. The graphical structures are combined in many ways. The Cartesian product is one of the way of combining graphs to get more general structures from the simple structures. In this paper, we study a–domination number of the Cartesian product of some simple path semigraphs.
Application of modified temperature-moisture relationships in the calculations of drying kinetics
Authors: Pakhomov A , Gatapova N , Kudra T 
Published: May 2020

Abstract
The paper presents a description of the modified temperature-moisture relationships, selected on the basis of the analysis of the kinetics of drying of liquid dispersed products on substrates and the methods of engineering calculation of the kinetics of drying with their application. Classification of the types of kinetic curves characterizing the change in the type of thermogram, such as a change in the angle of inclination, deformation and degeneration of the wet-bulb thermometer and boiling plateaux, allows obtaining a modified type of temperature-moisture relationships for their use in calculations of the drying kinetics. The choice of the type of temperature-moisture relationship is carried out on the basis of the solution developed by the authors of the forecast model of the kinetic curve type. The engineering method for calculating the kinetics of drying liquid dispersed products on substrates is based on solving the basic equation of drying kinetics, choosing the type of temperature-moisture relationship, calculating the coordinates of the reference points of temperature-moisture relationship, determined on the basis of the drying mode and the properties of the dried material.
Computational fluid dynamics modeling in a fixed adsorbent layer during separation of gas mixtures
Authors: Akulinin E I , Golubyatnikov O O , Dvoretsky D S , Dvoretsky S I 
Published: May 2020

Abstract
The paper discusses the numerical analysis results of the aerodynamic structure of a flow in the granular adsorbent layer in a pressure swing adsorption unit adsorber during atmospheric air separation and oxygen concentration. The computational experiments were carried out using one-dimensional and two-dimensional mathematical models to calculate the velocity field in the adsorbent bulk layer. While assessing the accuracy of calculating the aerodynamic structure of the gas flow in the adsorbent, it was found that the use of a two-dimensional mathematical model provides an increase in the accuracy of calculations by an average of ~1-2% compared with the one-dimensional model.
Nondestructive method of thermophysical properties monitoring and its implementing system using microwave heating
Authors: Mordasov S , Udalova A , Chernyshov V 
Published: May 2020

Abstract
An adaptive microprocessor information-measuring system is proposed, in which a new method of determining thermophysical characteristics (heat conductivity and temperature conductivity) of construction materials is implemented by measuring the temperature of two points on the surface of a sample exposed to pulse thermal impact from the microwave radiation of the given power focused into a line. If the steady state excess temperature at the checkpoint is equal to the set value, the repetition rate and the number of pulses are adaptively set by the system. Experimental verification confirmed the operability of the system implementing the proposed method as well as the correctness of the theoretical conclusions underlying the method.
Building of the dynamic models of visualization of the methodology for assessment of the level of students’ competencies creation
Authors: Gushchina O M , Anikina O V 
Published: May 2020

Abstract
One of the important task of the education system is to ensure the high quality training of students with a competency-based approach. The authors offered a scenario of the visual assessment technique of the level of students’ competencies creation with the usage of software tools, which together with innovative diagnostic algorithm allow to provide the analysis of educational data, see the results of the educational program learning and draw the conclusion about the level of students’ created competencies. The software tools are based on the ranking of components “knowledge – efficiencies – skills”, that is used for solving the problem of assessment of the levels of students’ competencies creation by the method of hierarchical system of fuzzy inference and centre-of-influence method. Statistical processing of the educational outcome is built in the developed program scenario that allow to provide a comprehensive visual presentation on analyzed sample of input data. Data display using the proposed data and obtained graphs allows to define vulnerabilities of the training of the students and the capacity to deal with them. On the use of developed scenario it is possible to observe the dynamics of students’ competencies creation and to improve the methodology and technology of educational process.
Automated processing of unmanned aerial vehicles images based on conceptual modeling of objective tasks
Authors: Vasendina I , Shoshina K , Guriev A , Aleshko R 
Published: May 2020

Abstract
In this article, the authors proposed a methodology for processing images of unmanned aerial vehicles, based on the conceptual modeling of objective tasks, which allows to increase the accuracy of decoding of forest resources due to the unified description of the conceptual model of the process. The approach is based on a hierarchical structural representation of the process of decrypting the image. The result of the application of the method is the determination of individual contours of tree crowns. The developed method involves the use of the watershed many times for each contour, which made it possible to determine the contours of each tree and at the same time not to miss trees with small crowns. Using the error matrix and the formula for calculating the Kappa Cohen index, the reliability of thematic decryption was evaluated. The developed methodology allowed to improve the identification of objects by 18.6%.
Equations of working lines in packed columns with regard to longitudinal diffusion
Authors: Golovanchikov A B , Zalipaeva O A , Prokhorenko N A , Shibitova N V , Merentsov N A 
Published: May 2020

Abstract
The analysis of differential equations of material balance with mass transfer taking into account longitudinal diffusion on both phases in a packed absorber and a distillation column is carried out. It is proposed according to the known algorithms for the calculation of absorption processes to calculate the working lines separately for two cases: 1) solid phase moves in the mode with longitudinal diffusion and dispersion in the ideal displacement mode; 2) continuous phase moves in the ideal displacement mode and dispersion mode with longitudinal diffusion, and then by summing the ordinates of the resulting working lines, to its overall significance to him and the equilibrium line on a standard methodology to calculate the height and diameter of the column.
Virtual reconstruction of Vernadskiy’s family estate in the village of Vernadovka in Pichaievskiy district of the Tambov region
Authors: Nemtinov V , Gorelov A , Borisenko A , Trufilkin S , Nemtinova Y 
Published: May 2020

Abstract
In this article, we consider the technology of creating a virtual space of memorable places associated with famous personalities who lived or worked there. It includes: analysis of various information sources and databases about the places of residence of famous people and their activities during their stay; creation of preliminary drawings and cartographic images of the territory; development of photorealistic three-dimensional models. Creating a virtual space in the form of a Virtual Museum is carried out using an open source software platform OpenSimulator, which is a server platform for 3D virtual worlds. In this study, we have made a virtual reconstruction of V I Vernadskiy’s family estate in the village of Vernadovka in Pitchaevskiy district of Tambov region related to objects, public and professional activities of an outstanding Russian scientist V I Vernadskiy.
Modeling of enzymatic waste water treatment
Authors: Novikov A , Lamskova M , Dugin E , Filimonov M , Grigorov S , Poddubskiy A , Chamurliev G 
Published: May 2020

Abstract
Processing and recycling of waste water is an important environmental problem. One possible and promising way to use the generated sludge is production biofertilizers for agriculture. However, in view of the risks of chemical and bacteriological contamination, it is necessary to develop technologies that ensure a high level of conditioning and stabilization of sludge. Maximum enzyme activity is observed in a microbubble medium under the conditions of a mesophilic process. To accelerate the biochemical transformation of pollutants, an enzyme-cavitation method has been developed, based on the stimulation of growth processes of microorganisms in bioreactors by low and high intensity cavitation created by turbojets. It has been established that the quality and duration of sludge treatment depends on the pressure of the substrate at the entrance to the oxidizing jets. It has been proven that at a pressure p = 0.30-0.35 MPa, the processing time of the sludge before stabilization of the chemical oxygen consumption at 16% is 8 hours. Microscopic studies found that the processed substrate is an accumulation of microorganisms with a total surface of up to 100 m2 per 1 gram of dry matter that provides high sorption properties with respect to moisture.
Petri transport networks
Authors: Sedykh I , Demakhin D 
Published: May 2020

Abstract
This paper presents a new class of Petri nets - Petri transport networks, used to simulate the transport’s systems. This class can be attributed to hierarchical temporal colored probabilistic Petri nets. The paper gives a definition, basic concepts, structure and functioning rules of Petri transport networks. The relevance of the topic raised in the article is due to increasing attention to the development of transport systems, their evolution and modernization. Modern management methods, various mechanisms for regulating traffic flows, infrastructural extensions, all this does not meet the challenges posed by modern transport infrastructure. Moreover, the problem is increasing every year. Petri transport networks introduced in the work, are a convenient tool ohms to simulate the transport’s systems of any complexity and scale. A new class of Petri transport networks is characterized by a hierarchical structure, in which the first level displays the entire system as a whole, the second - the internal structure of each object. Distinctive features are also the adjustment of the activation of traffic flows by means of a control marker, inter-level synchronization, separation of positions and transitions to types having different functions.
Teacher and students response to learning devices based on van hiele theory
Authors: Wiska S , Musdi E , Yerizon Y 
Published: May 2020

AbstractCritical thinking is one of the higher order thinking ability that needs to be developed in the 21st century. In fact, that the students’ critical thinking ability are still low. In learning geometry students are still dependent on the teacher in receiving information, the media are inadequate in learning geometry so that students have not been trained to solve geometry problems with critical thinking. Thus a geometrical learning devices was made based on the van hiele theory. Before using the geometry learning devices, it is validated first with the experts, asking the teacher’s response, and student responses through questionnaires and interviews. The subjects of this study were class VIII students of SMP 13 Padang. The results showed that the response of teachers and students showed the geometry learning devices is practical criteria.
The Validity of realistic mathematics education based mathematics learning materials for vocational high school students
Authors: Noperta N , Armiati A , Permana D , Yerizon Y 
Published: May 2020

Abstract
The validity of learning materials made by the teachers is untested, so it is not valid yet to use in supporting the improvement of students’ mathematical communication skills. This research is a part of RME based research on Mathematics learning materials development to improve mathematical communication skills for Grade X SMK students on construction and property engineering programme. This research is aimed to assess validities of learning materials through two phases. First, self-evaluation was conducted by involving a peer. The results showed that Mathematics learning materials could be extended to the expert review phase with minor revision. Second, expert review, the researcher asked five experts to assess its validity. Thus, the results show Mathematics learning materials have been valid.
An initial observation of learning devices development based on discovery learning to increase students’ creativity
Authors: Rafida L L , Permana D 
Published: May 2020

Abstract
Creativity is a combination of logical and divergent thinking that is used to bring up a new idea. The type of research was a descriptive research by using qualitative approach. An initial observation of learning devices development based on discovery learning aims to (1) to know an initial conditions of mathematical planning and learning that are developed by the teacher (2) to know and review how creativity of senior high school students in mathematics learning (3) whether it is necessary to continue research development based on discovery learning to improve creativity of senior high school students. The results of preliminary observations indicate that: (a) mathematics planning and learning that are developed by teachers is still general. (b) So that the creativity of high school students in mathematics learning is still low. (c) Based on this, follow-up action is needed in the form of research on development based on discovery learning to increase creativity of senior high school students (SMA N 5 Padang on 2018/2019).
Development of realistic mathematics education based learning device to improve students’ mathematical connection
Authors: Elpina D , Syarifuddin H , Yerizon Y 
Published: May 2020

Abstract
Mathematics is not directly given to the students in the form of formulation, however students have to construct the knowledge by themselves through contextual problem interactively, both in formal and informal, so that students can discover the truth of the concept by themselves. One of the important components in mathematics learning is mathematical connection; however, students’ ability of mathematical connection is far from the expectation. Therefore, the development of learning device with an approach and strategy to allow mathematics as the activity of the students is of vital importance. The designed learning device by using RME approach and by adding strategy of relating, experiencing, applying, cooperating, and transferring (REACT) based on constructivism which places the students as the center of the learning. The purpose of this research is to develop RME based learning device which is valid, practical and effective to improve students’ mathematical connection of class IX Junior High School (SMP). This is a development research model by employing Plomp model which consists of three phases, namely, preliminary research phase, development and prototyping phase, and assessment phase. Preliminary research reveals that students are less interesting to learn mathematics since they have only few chances to find concept through relevant practice with their individual experience and that are suitable with students’ cognitive level.
Improving Students’ Problem-Solving Ability through Learning Tools Based on Problem Based Learning
Authors: Permatasari C P , Yerizon Y , Arnawa I M , Musdi E 
Published: May 2020

Abstract
Our preliminary research conducted on students grade VII of junior high school showed that the students’ mathematical problem-solving ability was still low. We suspected that learning tools used so far have not been able to facilitate students to develop mathematical problem-solving abilities. The low ability to solve mathematical problems of students can be overcome by developing learning tools based on Problem Based Learning. The purpose of this study was to analyse the results of the development of learning tools based on Problem Based Learning to improve the mathematical problem-solving ability of students in grade VII. This type of research is development research where the subjects were students grade VII of junior high school. We used the Plomp model which consists of three stages; investigation, development or prototype, and the assessment. The instruments used to find out the practicality of the learning tools developed were interview guidelines, student questionnaire responses, teacher questionnaire responses, and observation sheets for the implementation of lesson plans. The results showed that our newly developed learning tools have been practical for use in the learning process.
Analysis of The Curriculum Expertise Program Art in The Development of The Learning Based on Realistic Mathematics Education Approach
Authors: Aini Yn K , Armiati A , Permana D 
Published: May 2020

Abstract
The study aim to analyze the curriculum to see and find out the linkages between Basic Competence mathematics and Basic Competence productive subjects in the art expertise program. This research was part of Plomp’s model development research. Curriculum analysis is carried out to obtain information in developing mathematics learning devices in the form of Learning Implementation Plans and Student Worksheets based on the Realistic Mathematics Education (RME) approach. From the results of curriculum analysis that has been done, it was obtained data that not all Mathematical Basic Competencies have anything to do with productive subjects in the fine arts expertise program. From a number of mathematics material in grade one 1st semester, there are four materials that have relevance to the context studied in students’ productive subjects, including the absolute value of one variable, the system of three-variable linear equations, functions, and the composition of functions. This means that the context studied in productive subjects can be used as an initial problem in the process of learning mathematics in the material
Analysis of Early Mathematical Problem-Solving Ability in Mathematics Learning for Junior High School Student
Authors: Yuristia N , Musdi E 
Published: May 2020

Abstract
Problem solving ability is one of the mathematical abilities that is very important so that students are able to apply the concepts they have learned. The purpose of this study was to analyze the initial ability of mathematical problem solving in mathematics learning of eighth grade students of junior high school. this is seen from the indicators as follows; 1) Identifying the elements that are known, asked, and the adequacy of the elements needed, 2) Formulating problems or compiling mathematical models, 3) Implementing strategies to solve various problems inside or outside mathematics, and 4) Summing up the results. The instrument used in this study was a preliminary test of students’ mathematical problem-solving abilities with questions as many as 3 items and a research sample of 32 people in the first school and 30 people in the second school. Assessment of students’ mathematical problem solving ability tests is based on a scoring rubric of mathematical problem solving abilities. Based on the results of this study, the percentage of students’ mathematical problem solving abilities was 18.95% and 14.57. The results of this study indicate the low ability of students to solve mathematical problems and the need for further action to improve them.
Development of Mathematics Learning Tools Based on Coaching Technique to Create Accelerated Learning Revolution
Authors: Tanjung S P , Permana D 
Published: May 2020

Abstract
One of the efforts to create Accelerated learning revolution of XXI century is the importance of innovation in mathematics learning by developing learning device based on Coaching Technique. The learning devices are in the form of lesson plan (LP) and student worksheet (SW) designed as the substitute coach for both teacher and student, hence the purpose and the target of learning can be achieved. Coaching provides steps that are systematic, practical, and in line with the learning purpose. Coaching technique can be implemented in the classroom by providing opportunity for teacher to conduct improvisation in teaching, to facilitate teacher to uncover students characteristics, as to provide opportunity for students to develop their own learning style based on their individual ability. The development model employed in this research is plomp model. This model consist of three phases, first, preliminary research, second development or prototyping phase and third assessment phase.
The Effect of Realistic Mathematics Education Approach Oriented Higher Order Thinking Skills to Achievements’ Calculus
Authors: Arnellis A , Fauzan A , Arnawa I M , Yerizon Y 
Published: May 2020

Abstract
The goal of this research is to determine the influence of the realistics mathematics education (RME) approach by oriented higher order thinking skills (HOTS) on the results of students’ mathematics learning on the subject of the calculus in SMAN 10 and SMAN 12 Padang. The method used is the experimental research with pre and post-test design randomized control group. The data analysis technique used is the test for normality and homogeneity test followed by using a t-test. The results revealed that there were an increase in student mathematic learning outcomes approach realistic mathematics education oriented higher order thinking skills in class XI MIPA SMAN 10 and SMAN 12 Padang. There is impact-oriented approach to realistics mathematics education approach by oriented higher order thinking skills to understanding student learning in class XI SMAN 10 and 12 MIPA Padang.