bluuebunny/crossref_metadata_2025_split huggingface dataset:
Increasing the breaking capacity of the 10 kV VAC in comparison with its own axial and radial magnetic fields
Authors: Cherenkov V A , Ivanov D V , Frolov V Y , Malavanh Onepavina 
Published: February 2021

Abstract
The research work considers vacuum arc-extinguishing chambers with axial and radial magnetic fields. The object of research is vacuum arc suppression chambers with an axial magnetic field of 10 kV, 20 kA and with a radial magnetic field of 10 kV, 40 kA as well as ways to increase the breaking capacity by changing the configuration for each type of chambers. The research work uses the method of mathematical modeling of physical processes in the Comsol Multiphysics software package, graphical modeling of chambers is performed in Compass v18. 0. The results showed that changing the geometric parameters of vacuum arc-extinguishing chambers can increase the breaking capacity. Based on the results obtained, it can be concluded that to increase the maximum cut-off current, it is sufficient to change the geometry of the vacuum arc-extinguishing chamber. In combination with other ways to increase the breaking capacity, it is possible to expand the area of application of vacuum interrupters - the most reliable, safe and environmentally friendly switching devices.
Electrotechnical complex for autonomous power supply of oil leakage detection systems and stop valves drive control systems for pipelines in arctic region
Authors: Belsky A A , Dobush V S , Ivanchenko D I , Gluhanich D Y 
Published: February 2021

Abstract
The article is dedicated to the important task of detection and elimination of liquid hydrocarbon leak in oil pipelines. The technological, regulatory and geographical aspects of the use of existing oil leakage detection systems (LDSs) and pipeline stop valves drive control systems are considered. The authors have proposed a new solution for autonomous power supply of oil LDS and stop valve drive control systems for pipelines located in inaccessible areas. The proposed autonomous power supply complex is based on thermoelectric generation units. The composition and parametric sufficiency of the autonomous complex is substantiated. The authors have developed the laboratory test bench, which verified the technical characteristics of the complex. The authors have substantiated the possibility of various designs for application of such complexes in existing pipelines.
To the question of determining bending stress of a buried pipeline from the ground surface
Authors: Aginey R V , Firstov A A , Kapachinskikh Zh Yu 
Published: February 2021

Abstract
The laying of buried pipelines in difficult engineering and geological conditions is associated with the need to take into account a large number of factors affecting the process of pipeline operation. It is practically impossible to take into account all these factors at the design stage. In this regard, methods that make it possible to assess the technical condition of the pipeline at a specific point in time acquire particular relevance. One of the promising methods for assessing the technical condition of underground pipelines is to survey the depth of the axis of the underground pipeline from the ground surface with subsequent use of the data obtained to assess the level of bending stress. The low popularity of this method lies in the large errors obtained in the calculations according to the developed methods. In the work, the reasons for the occurrence of significant errors in determining bending stresses when using survey data were analyzed, mathematical dependencies were proposed that make it possible to evaluate bending stress based on the data obtained with the accuracy specified at the design stage of the experiment. Calculations are provided that confirm the adequacy of the proposed mathematical models.
Centralizing devices to complement acoustic logging tools
Authors: Gilmanova A M 
Published: February 2021

Abstract
One of the cornerstones to high-precision acoustic logging equipment is high reliability and maneuverability of tools in a sophisticated well. The paper outlines the requirements for centralizing devices (CD), experimental and theoretical rationale for different configurations, and the need for appropriate calculations. The outputs involve a series of updated centralizing devices, the classification of centralizing devices and a crossplot that all allow for an optimal centralizing configuration to be selected depending on the equipment available and a well examined.
Effect Implementation of Information Technology Software On Improving Performance Capacity Academic and Non Academic Service Sunan Ampel Islamic University of Surabaya
Authors: Ilham  , Eliyana Anis , Rizki Sridadi Ahmad , Usman Indrianawati , Purnomo Agung 
Published: February 2021

Abstract
This research was conducted to examine the effect of applying information technology software to increase the capacity of academic and non-academic performance at the Sunan Ampel State Islamic University in Surabaya as a work support tool. The aim is to apply a software that is able to identify the needs of increasing performance capacity at Sunan Ampel State Islamic University in Surabaya, both academic and non-academic, so that systematic control and evaluation of all academic and non-academic operations can be carried out. The research respondents were 60 students and employees from the Faculty of Science and Technology of the Sunan Ampel State Islamic University in Surabaya. This research uses a quantitative approach with the analysis technique used is path analysis with SmartPLS software-based data processing and the overall results support the hypothesis. Based on the results of the study stated that Information Technology has a positive and significant effect on performance, Information Technology has a positive and significant effect on academic services, Information Technology has a positive and significant effect on non-academic services, but performance has no effect on academic and non-academic services. The conclusion of the research is the influence of the application of information technology software can improve academic and non-academic performance and services at the Sunan Ampel State Islamic University of Surabaya
Design of Discovery Learning Model Biodiversity Integrated to Develop the Scientific Attitude of Student
Authors: Mulyani Aty , Rusdi Muhammad , Yelianti Upik , Syahrial  
Published: February 2021

Abstract
In learning Biology with a scientific approach, the scientific attitude becomes important to be developed in students, the problem is not all teachers have the creativity and innovation to develop the scientific attitude. In this study, stages will be carried out to design a scientific approach to discretion for the subject of integrated ethnobotany biodiversity and religious value. The Ethnobotany Study is interesting because this study discusses the biodiversity of local plant species, the names of these plants in local terms, scientific names, benefits for life, as well as including their classification in Plant taxonomies. This type of research is a qualitative descriptive research. In this study, the research team conducted observations, interviews with officers and resource persons at Perhutani Jambi with address: Jln Lintas Jambi-Palembang, Kenali Asam Bawah, Kota Baru, Jambi, KM 11, Jambi. Data obtained related to the type of local plants are carried out verification and data reduction, and integrating local plant knowledge in the context of ethnobotany in the subject of Biodiversity in Biology. The results of the study found five main local plants in tropical forests, namely (1) Jatropha (Ricinus communis). (2) Bulian (Eusideroxylon zwageri), (3) Meranti Bunga (Shorea leprosula Miq), (4) Meranti Putih (Shore spp) (5) Jengkol (Archidendron pauciflorum) (6) Gaharu (Aquilaria malaccensis), (7) Ketapang (Terminalia cattapa) In this study it was also found that local plants as ethnobotany were cultivated mostly for blandar wood (beam), Usuk, and house sills, because they were resistant to termites, namely Bulian, Meranti Bunga, Meranti Putih plants, Gaharu type plants for deodorant can be taken, other types of productive plants found fruit, and ornamental plants for parks or protectors to be planted on the roadside. In its application, the information obtained from these types of plants and their benefits are packaged in the study of Biodiversity in Biological Materials. The design of teaching materials, the teacher assigns assignments to students for observation, interviews, analyzing data, and presenting their findings in the Perhutani Tropical Forest to increase the scientific attitude of students.And assigns assignments to discovers sens of religious value at The Holy Alquran related to religious values on biodiversity material.
Implementation of Google Meet Application in the Learning of Basic Science in the Covid-19 Pandemic Period of Student Learning Interests
Authors: Septantiningtyas Niken , Juhji Juhji , Sutarman Adang , Rahman Abd , Sa’adah Nurus , Nawisa  
Published: February 2021

AbstractThis research is a quantitative study aimed to find the effect of the Google meet application on student interest in the University of Nurul Jadid Paiton Probolinggo by using experimental design research design using two parallel classes, one class is used for experimental treatments and one other class as a control class. There is a significant difference between the experimental class conducted by learning using the Google Meet application and the control class where the learning process is carried out directly (face to face). The highest interval of interest in learning is found in the experimental class with a score of 110 and the lowest with a score of 94 with an average interval of 101.84. While the control class only had the highest score of 106 and the lowest score of 70 with an average interval of 89.52. So with this overall data that learning using the Google meet application has a very high influence on student interest in learning this is because the learner is very easy to implement, time is flexible and can be implemented where each student is located.
Self-Regulation using Moodle Virtual Learning Environment (VLE) in Solar System Practice
Authors: Rosyadi BR , Nisa Khoirun , Afandi Irfan , Rozi Fathor , Fawaid Ahmad , Fajri Zaenol , Hasanah Uswatun , Maimunah  , Sri Helmiati S 
Published: February 2021

Abstract
The purpose of this study is to measure the level of self-regulated students obtained from their academic achievements when learning to use Moodle virtual learning environment (VLE) in the practice of the solar system. This study involved 37 students of grade IX junior high school in Paiton Probolinggo, of which 18 students in the experimental group studied using Moodle Virtual Learning Environment (VLE), and 19 students in the control group who studied with conventional learning. In this study, students’ self-regulated measures were measured using a 4-point Likert scale. The results of this study indicate that the level of self-regulated students who learn to use Moodle virtual learning environment (VLE) is higher than students who study conventionally.
Ethnomathematics in Balinese Traditional Dance: A Study of Angles in Hand Gestures
Authors: Radiusman R , Wardani K S K , Apsari R A , Nurmawanti I , Gunawan G 
Published: February 2021

Abstract
The study was aimed to explore the ethnomathematics in hand gestures of Balinese traditional dances. The scope of ethnomathematics discussed was limited to the geometry object, specifically angles. The object of the study was Pendet Dance, one of the popular traditional dance from Bali which usually perform to welcome the guest in a formal and informal event. The method of the research was a case study in which we deeply analyse the hand gestures in Pendet Dance. The data were gathered from observation of the dance and interview the experts in Balinese Dance. The data were analysed qualitatively using descriptive method. From the analysis, it was found that the hand gestures of the dancers in Pendet Dance is forming three types of angles, i.e. acute angle (0° < a < 90°), right angle (a = 90°) and obtuse angle (90° < a < 180°). The angles can be seen in a number of pattern of the hand gestures such as in ngumbang, agem, ulap-ulap and ngelung movement.
Misconceptions and Errors in Integer Operations: A Study in Preservice Elementary School Teachers (PGSD)
Authors: Rosyidah A N K , Maulyda M A , Jiwandono I S , Oktaviyanti I , Gunawan G 
Published: February 2021

Abstract
This study aimed to describe the types of misconceptions conducted by preservice elementary teachers (PGSD) students in integer operations. Misconceptions are classified into 3 types: 1) Careless Errors (Ca); 2) Concept errors (Co); 3) Careless errors and Concept errors (Ca and Co). The researcher presented 6 problems about of integer operation to 45 students of PGSD (preservice teachers for elementary school) students that were taking elementary mathematics subject. The results showed that 10% of students made Careless errors (Ca) misconceptions in integer addition and subtraction. The highest portion of the students, 53% performed Concept error (Co) in subtracting negative numbers. Another 9% showed Careless and Concept error (Ca and Co) misconception in subtraction of integers of the same sign (negative with negative or positive with positive).
Assessment of an air quality surveillance network through passive pollution measurement with mobile sensors
Authors: Lorenzo-Sáez Edgar , Oliver-Villanueva Jose-Vicente , Lemus-Zúñiga Lenin-Guillermo , Coll-Aliaga Eloina , Castillo Carolina Perpiñá , Lavalle Carlo 
Published: February 2021

Abstract
Today, about 55% of the world population lives in cities and this is foreseen to increase to 68% by 2050. The urban activities of such a large number of people in relatively small spaces can make the air quality levels in cities harmful to human health. For this reason, the European Union (EU) has established a regulatory framework to control and improve air quality levels in cities (Directive 2008/50/EC) by defining a number of fixed stations and other requirements. The aim of this work is to evaluate the air quality reported by the official fixed stations via the installation of a complementary mobile network of air quality based on passive dosimetry of NO2 measurement during the period 2017–2019. In this study, Valencia (Spain) is selected as a representative European city with seven fixed stations and a network of 424 passive dosimetry sensors distributed throughout the city. In addition, an index of impact of pollutant on population is developed to optimize the locations of air quality stations among neighbourhoods across the city based on the levels of pollution measured by mobile sensors and the population directly affected. The results obtained show that 43.7% of mobile sensors in Valencia exceeded the limit value established by the EU Directive as well as by the World Health Organization during the assessment period. This indicates that the air quality levels offered by the fixed stations are neither representative nor reliable for the air quality monitoring of the city. Thus, the fixed stations currently operating do not provide reliable information on the areas of the city where the majority of the population breathes air with the highest level of pollution. Specifically, the results show that 34.6% of citizens live in areas with an average annual value above the limit recommended for the protection of human health.
Quantum particle on dual root lattice in Weyl alcove
Authors: Brus Adam , Hrivnák Jiří , Motlochová Lenka 
Published: February 2021

Abstract
Classes of discrete quantum models that describe a free non-relativistic quantum particle propagating on rescaled and shifted dual root lattices inside closures of Weyl alcoves are constructed. Boundary conditions of the discrete quantum billiard systems on the borders of the Weyl alcoves are controlled by specific combinations of Dirichlet and Neumann walls that result from sign homomorphisms and admissible shifts inherent in generalized dual root lattice Fourier–Weyl transforms. The amplitudes of the particle’s jumps to neighbouring positions are controlled by a complex-valued dual root lattice hopping function with finite support. The solutions of the time-independent Schrödinger equation together with the eigenenergies of the quantum systems are explicitly determined. The matrix Hamiltonians and eigenenergies of the discrete models are exemplified for the rank two cases A
2 and C
2.
Integrability in the multistate Landau-Zener model with time-quadratic commuting operators
Authors: Chernyak Vladimir Y , Sinitsyn Nikolai A 
Published: February 2021

Abstract
All currently known exactly solvable multistate Landau–Zener (MLZ) models are associated with families of operators that commute with the MLZ Hamiltonians and depend on time linearly. There can also be operators that satisfy the integrability conditions with the MLZ Hamiltonians but depend on time quadratically. We show that, among the MLZ systems, such time-quadratic operators are much more common. We demonstrate then that such operators generally lead to constraints on the independent variables that parametrize the scattering matrix. Such constraints lead to asymptotically exact expressions for the transition probabilities in the adiabatic limit of a three-level MLZ model. New more complex fully solvable MLZ systems are also found.
Matrix moments in a real, doubly correlated algebraic generalization of the Wishart model
Authors: Guhr Thomas , Schell Andreas 
Published: February 2021

Abstract
The Wishart model of random covariance or correlation matrices continues to find ever more applications as the wealth of data on complex systems of all types grows. The heavy tails often encountered prompt generalizations of the Wishart model, involving algebraic distributions instead of a Gaussian. The mathematical properties pose new challenges, particularly for the doubly correlated versions. Here we investigate such a doubly correlated algebraic model for real covariance or correlation matrices, which is known as matrix variate t-distribution in the statistics literature. We focus on the matrix moments and explicitly calculate the first and the second one, the computation of the latter is non-trivial. We solve the problem by relating it to the Aomoto integral and by extending the recursive technique to calculate Ingham–Siegel integrals. We compare our results with the Gaussian case.
Experimental studies into the kinetics of the process of vacuum drying of carrot chips
Authors: Ustinova M E , Yashonkov A A 
Published: February 2021

Abstract
The need to develop a technology for the production of a new healthy food product from vegetable raw materials has been substantiated in the paper. The choice of carrots of the cultivar Chantenay royal, Champion, Dordogne for use as the feedstock is justified. The design and principle of operation of the installation for conducting experimental studies are described. Experimental studies and a comparative analysis of their results in the production of carrot chips by drying at atmospheric pressure, vacuum drying at a pressure of 10 kPa and using preliminary pore formation followed by vacuum drying at a pressure of 10 kPa has been carried out. By the method of selection of objects according to their belonging to one of the structural elements (product, pores) by analyzing photographs of slices of chips, the dependence of the surface area of moisture evaporation on drying methods has been determined. It was found that the use of preliminary pore formation between the periods of heating the material and a constant drying rate significantly increased the energy efficiency of the process.
The cupcakes with new functional ingredients for personalised school feeding
Authors: Lobosova L A , Maliutina T N , Derkanosova A A , Frolova L N , Vasilenko V N , Nesterova I Y 
Published: February 2021

Abstract
The production of new types of confectionary with increased nutritional value for the healthy diet of different categories of the population is a perspective trend in the confectionary production. Vegetative resources, particularly farro flour and fruit and vegetable puree, are perspective sources of raw materials. The choice of recipe components has been explained and their nutritional and energetic values have been demonstrated. The research object is wheat flour of premium quality (GOST 26574-2017); farro flour (TU 9293-002-94319966-2010); applesauce (GOST 32742-2014); apple-pumpkin-apricot puree. The appearance, taste, colour, smell, shape, surface, the appearance of fracture were measured organoleptically (GOST 5900-2014), the weight fraction of solid matter (SM) in raw materials, intermediate products and items through dehydrating at 103 °C in the oven during 40 minutes (GOST 5900-2014); alkalinity according to GOST 5898-87, density according to GOST 15810-2014. The calculation of nutritional and energetic value was carried out. The recipe of the cupcake «Apple cupcake» was chosen as controlling. Applesauce was substituted with apple-pumpkin-apricot puree during recalculation for dry substances. Wheat flour was substituted with farro flour according to proportions: 90:10; 70:30; 60:40; 50:50. The 70:30 dosage was chosen to be rational. According to organoleptic indicators, elaborated items differ by a pleasant golden colour of the sourdough and a taste which is common to the fruit and vegetable additive.
Justification for the use of waste from tea production
Authors: Shchegoleva I D , Molchanova E N , Maslova O V , Sokolova O S 
Published: February 2021

Abstract
In tea-importing countries, to which Russia belongs, waste such as tea dust remains at tea packaging enterprises. This is a powdery mass consisting of particles of dry leaf tea. Leaf tea contains valuable biological compounds: caffeine, flavonoids, tannins, proteins, vitamins. It can be assumed that the chemical composition of tea dust and leaf tea are similar. In order to determine the possibility of rational use of tea dust, a study was conducted of its organoleptic, physico-chemical characteristics and chemical composition. We used an average sample of tea dust, which was compared with black leaf and green leaf tea obtained in one enterprise. Laboratory methods determined the total content of water-soluble extractive substances, the mass fraction of moisture, the total ash content, the content of water-soluble polyphenols, total and non-protein nitrogen, as well as the protein content and the content of various carbohydrates. It was found that the composition of tea dust is dominated by the remains of black tea leaves, which corresponds to the share of this tea variety in the company’s products. Tea dust slightly exceeded black leaf tea in extractives - 35.64% (black tea - 32.47%), mass fraction of moisture - 7.45%, total ash content - 6.19%. In the tea dust sample, the content of water-soluble polyphenols was 7.46%, the amount of protein was 17.44%. The bulk of the proteins are insoluble in water. Studies have shown that tea dust has the potential of an additional raw material source of biologically active substances.