bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparisons of Subgrid-Scale Models for OpenFoam Large- Eddy Simulation
Authors: Feng Zhipeng , Qi Huanhuan , Huang Xuan , Liu Shuai , Liu Jian
Published: March 2021

OpenFOAM is a free, open-source software package that can be used for the solutions of computational fluid dynamics and simulation of various fluid flow processes. Nevertheless, OpenFOAM still lacks default settings and a large number of different numerical schemes and turbulent models should be validated. In this paper, the unsteady flow around a cylinder (Re=3900) is calculated by the large eddy simulation of OpenFOAM. The predictions include the drag and lift coefficient, the pressure distribution around the cylinder, the velocity distribution and Reynolds stress distribution in the wake region, as well as the prediction of the recirculation length and separation angle. Thanks to several simulations, these five subgrid-scale (SGS) models are compared and studied: The Smagorinsky SGS model, wall adaptive local eddy visibility SGS model, dynamic SGS model with Lagrangian averaging, dynamic one equation eddy visibility model, one equation eddy visibility model. The numerical results are verified with the published experimental data.
Prediction of the real estate industry economics based on LSTM model
Authors: Zhang Taoen , Fang Baojun
Published: March 2021

The economics of real estate industry has been seriously affected by the 2019-NcoV. Therefore, this study analyzed the changes of real estate industry and LSTM model was applied to predict the price of real estate industry. The error analysis was done to test the accuracy of model and the result indicated the model established in this paper has high accuracy and meaningful for practical application.
Research and Analysis on the Reliability of Smart Energy Mete
Authors: Chen Jintao , Zhao Fang , Zhu Wenjun , Huang Liang , Zhou Qiang , Shan Zhaoguo , Liu Liangtao
Published: March 2021

Analysis and study the reliability theory of smart electric energy meters, as well as reliability analysis indicators and fault distribution rules. Starting from the distribution law of fault data and reliability indicators of fault life, the reliability of electric energy meters is analyzed by collecting field maintenance data. The reliability model is used to study the failure modes, causes and effects of smart electric energy meters. The research and analysis of the reliability of the smart electric energy meter ensure the normal operation of the intelligent electric energy meter and improve the stability and reliability of the intelligent electric energy meter.
Research and Application of Intelligent Learning System for Power Grid All-Element Simulation Based on Microservice
Authors: Zhou Lijun , Gai Xiaoping , Lu Yu , Wu Ping , Ren Duanjun , Zhao Chengjie , Sun Aichun
Published: March 2021

This paper introduces a development method of a micro-service-based power grid full-element simulation smart learning system. It explains in detail how to make full use of the microservice technology to develop services for the power system simulation training platform to solve the collaborative problems of different scopes, different characteristics, and different types of simulation calculations. The method can effectively use the computer resources of the training system, avoid the waste of resources of the training system on the simulation computing platform, and reduce the investment in hardware equipment. Finally, this article verifies the feasibility of the development method proposed in the article through a practical case.
Template Features Guided Siamese Keypoints Detection for Visual Object Tracking
Authors: Wang Ershen , Wang Donglei , Huang Yufeng , Qu Pingping , Pang Tao , Xu Song
Published: March 2021

Visual object tracking is one of the challenging tasks in computer vision. Among tracking tasks, accurately state estimation is the main challenge. Most current methods simply adopt multi-scale searches or anchors to estimate the state, which need many hyper-parameters and complex calculations. To face this challenge, we propose an anchor-free tracking framework based on Siamese network. The proposed framework consists of template features guided Siamese subnetwork and keypoints detection subnetwork. We take simplified hourglass network as backbone in Siamese subnetwork to improve the tracking efficiency and the prediction of corners around target instead of the prediction of target in keypoints detection subnetwork. We experiment our approach on OTB-2015 and VOT-2016, and our approach acquire the best precision of 0.841 on OTB-2015 and runs at 39 FPS.
Analysis of Urban Spatial Structure based on Index Superposition and Color Distance Calculation: An Example based on the City of Honghu
Authors: Gu Rongfei , Zhang Fan , Huang Wei
Published: March 2021

Superposition of multiple index method is used to construct index-fusion remote sensing images, and color statistical analysis and color distance calculation are carried out for urban areas in the fusion remote sensing images to automatically extract the large-scale construction land. The evaluation of the accuracy of the automatically extracted construction land can be done by using high precision Google Earth images. Center of gravity of the automatically extracted construction land is taken as the measurement index of urban spatial distribution, and the dynamic changes of urban spatial structure are analyzed according to the center of gravity. Experiments show that this method can effectively distinguish construction land from other ground objects, thus realizing the high accuracy extraction of construction land. And the center of gravity of Honghu City shows a development pattern and its possible influencing factors for small cities in central China.
A Multi-Swarm Structure for Particle Swarm Optimization: Solving the Welded Beam Design Problem
Authors: Kamil Ahmed T. , Saleh Hadeel M. , Abd-Alla Israa Hussain
Published: March 2021

Several studies exist in the literature that utilized metaheuristics and nature-inspired algorithms to solve engineering problems. Particle Swarm Optimization (PSO) is a well-known nature-inspired algorithm that has been used for different optimization problems due to its simplicity and ability to find near-optimal solutions. However, PSO suffers from a problem of balancing between the global search and local search abilities when applied to engineering problems. Recently, a new variant of PSO based on a novel multi-swarm architecture called Multi-swarm Particle Swarm Optimization (MPSO) was proposed. The proposed MPSO was evaluated on solving normal and large-scale problems. This study evaluated the possibility of using MPSO to simulate Welded Beam Design (WDB) problem which is a mechanical engineering problem. Several simulations were performed using the proposed approach and from the results, MPSO model was observed to simulate WBD problem with better optimal solution compared to the standalone PSO. The outcome of this study further confirmed the robustness of the MPSO over the other known metaheuristics. Generally, MPSO achieved an excellent optimization performance with a fast convergence learning process.
Performance Analysis of 64 Channel DWDM System Using Single Mode Fiber at Different Power Levels and Frequency Spacing
Authors: Thummar Ruturaj , Dhadhal Dharmendra , Mishra (Sr. Member IEEE) Vivekanand
Published: March 2021

Dense wavelength division multiplexing system is processing at a superfying due to very high transmission capacity in optical communication. In this research article, we analysis 64 channels DWDM system at 10 Gbps data rate is used to rectify the system quality at different power levels and different frequency spacing an 50 km Single Mode Fiber (SMF). For the batter gain we used EDFA (Erbium Doped Amplifiers), system efficiency and system capacity enhancing using DCF in this work. Also simulation at different power levels and frequency spacing analyze BER, Q-factor and Eye height is the terms of results using Optisystem software.
Low Power Analog Multiplexers for ECG Applications
Authors: Gnaneshwara chary Udari. , Kakarla Harikishore
Published: March 2021

This paper demonstrates the design of the 8 channel and 16 channel biomedical data selector with passtransistor switches. Pass transistor switches are designed with NMOS switch logic in 45nm technology. Data selectors are the important input circuitry to instrumentation amplifier in the Electrocardiogram (ECG). Generally, Inputs for ECG are very low voltages in terms of millivolts and frequency also in HZs. The proposed designs are useful in 3 lead 6 lead and 12 lead ECGs. The power dissipation is 11.055 pW at 1HZ and its calculated for supply voltages of 0.5 V and frequency analysis are done in between 1HZ to 10 KHZ.
Implementation of IIoT based smart crop protection and irrigation system
Authors: Nanda Ipseeta , Chadalavada Sahithi , Swathi Medepalli , Khatua Lizina
Published: March 2021

A centralizing method in the area of IIoT (Industrial Internet of Things) contrived for understanding agriculture which is preceding the arrangements low-power devices [5]. This paper yields a monitoring procedure for farm safety against animal attacks and climate change conditions. IIoT advances are frequently used in smart farming to emphasize the standard of agriculture[6]. It contains types of sensors, controllers. On behalf of WSN, the ARM Cortex-A board which consumes 3W is the foremost essence of the procedure [9]. Different sensors like DHT 11 Humidity & Temperature Sensor, PIR Sensor, LDR sensor, HC-SR04 Ultrasonic Sensor, and camera are mounted on the ARM Cortex-A board. The PIR goes high on noticing the movement within the scope, the camera starts to record, and the data will be reserved on-board and in the IoT cloud, instantaneously information will be generated automatically towards the recorded quantity using a SIM900A unit to notify about the interference with the information of the weather conditions attained by DHt11[14]. If a variance happens, the announcement of the threshold rate will be sent to the cell number or to the website. The result will be generated on a catalog of the mobile of the person to take the necessary action [7].
Two dimensional modeling (2D) gravity method for interpreting subsurface structure of mount Merapi
Authors: Anggraeni F K A , Sulistyorini
Published: March 2021

Mount Merapi is one of the active volcanoes in Indonesia. The characteristics of this mount are explosive and eruptive. Moreover, its eruption causes lava floods. Its last eruption took many victims, and they were both dead and injured. They lost belongings and anything surroundings as well. Considering the negative impacts, research is needed to determine the subsurface structure of Mount Merapi as a disaster mitigation measure. One method that can be used is the gravity method. The gravity method is a geophysical method with an interpretation based on the different density of masses obtained from the Earth’s gravity acceleration data. In this research, an interpretation of the results of two-dimensional modeling will be performed. Research data is secondary data obtained from satellites. The research uses a literature study method on Mount Merapi by processing gravity data to obtain Bouguer anomalies, separating Bouguer anomalies into local and regional anomalies using MagPick and Surfer software, and two-dimensional modeling to determine density value density of subsurface mass using Grav2dc software. The results obtained consist of lithological interpretation consisting of basalt-andesite rocks, pyroclastic rocks, and magma chamber.
Mapping of cropland suitability at marginal area Situbondo district
Authors: Sari S , Martono  , Zahrosa D B , Romadhona S
Published: March 2021

Marginal land development in Situbondo Regency has not yet received special attention from farmer as the farmer-enterpreneur, so that the efforts made by stakeholders have not yet gotten maximum results. Therefore, increasing awareness and understanding of the development and use of marginal area is needed. The objectives of this study are: 1) knowing the land characteristics of crops commodities at marginal land and (2) mapping the suitability of cropland at marginal land. The locations of the study are Jatibanteng and Sumbermalang Subdistricts with the consideration that the subdistrict is the area where the majority of rice fields are dry and marginal area in Situbondo Regency. The research method uses an analytical approach. The data collection method is using secondary data, which is available statistical data that has been published by BPS and primer data. The data analysis method uses SRTM (Shuttle Radar Topography Mission) and soil chemical analysis. The results showed that of (1) the land characteristics can be seen from soil chemical analysis including: a) Phosfor content of land ranged from 28,06-84,28 me/100g which was dominated by high status; b) Potassium value of land ranged from 16.95-59.96 me/100g which was dominated by moderate status; c) Organic matter content of land ranged from 1.75-3.39% which was dominated by medium status; d) Cation Exchange Capacity (CEC) value of land ranged from 14.76 - 37.03 me/100g which was dominated by the high status; and e) Base Saturation in Jatibanteng Subdistrict was classified as low to moderate, ranged from 30.39% - 50.10% and Sumbermalang subdistrict ranged from 20.15% - 48.62%. Provision of organic material is a way that can be applied to increase the value of BS, because organic matter affects soil properties such as its physics and chemistry. (2) Meanwhile the the second objective was found that: a) around 35% of Jatibanteng Subdistrict was in the S1 (Highly Suitable) category; on the other hand, Sumbermalang Subdistricts was in the S2 (Moderately Suitable) and S3 (Marginal Suitable) categories for the rice field suitability, b) class suitability of corn in the study area was included in the more dominant of S2 (Moderately Suitable) category reaching almost 85% of the land areas, and c) cassava plants had an S1 (Highly Suitable) suitability class dominated by Jatibanteng Subdistrict which was almost 50% of its areas in Sumbermalang Subdistrict with the suitability of S2 (Moderately Suitable) and S1 (Highly Suitable).
Review on the potential application of bacterial cementitious composites in Indonesia
Authors: Linda R , Prabowo H , Indrayadi I
Published: March 2021

Cementitious composites are common construction material for infrastructures. Their abundant resources are one of the reasons why they are widely consumed. The drawback of these materials is its brittle nature resulting in unavoidable cracking problems in the infrastructures. Further, the crack will initiate the corrosion of steel reinforcement and reduce structural durability. Calcium carbonate precipitating bacteria are the potential to heal the cracks in the cementitious composite if they are selected and treated carefully. This paper reviews different types of bacteria applied in concrete, and the methods can be used as a healing agent. This study recommends using bacterial cementitious composites as self-healing material, surface treatment, and crack healing agent.
Forecast and soybean production base in East Java
Authors: Soetriono  , Maharani A D , Zahrosa D B
Published: March 2021

East Java Province as one base regions of the soybean commodity. Soybean also provides added value, when processed into tofu, tempeh, chips, soy sauce and other products. The fact is that agro-industry activities are still dependent on imported raw materials. The objectives of this study is to forecast soybean commodity production and find out soybean production base in East Java. The locations of the study are East Java Province, because it has the largest harvest area and highest production in Indonesia. The research method applies an analytical method. The data collection method uses secondary data, in which the available statistical data has been published by BPS. The data analysis method used is base and non-base sector analysis Location Quotient and Box-Jenkins Model (ARIMA) analysis. The results show that out of 38 district and city in East Java, ther are 10 district soybeans production base. The district of soybean production base is Sampang Banyuwangi, Nganjuk, Bangkalan, Lamongan, Bojonegoro, Trenggalek, Blitar, Ponorogo and Jember District. The highest LQ value of soybean base production is Sampang district of 5,49; Banyuwangi district of 2,77 and Nganjuk district of 2,00. The development of soybean production forecasting in East Java in 2018-2027 fluctuations, tends to be constant and increase.
Description of the composition of gold to silver minerals in the rock containing gold
Authors: Said I , Rahmawati S , Ningsih P , Astuti
Published: March 2021

This study aimed to determine the composition of gold to silver minerals in rocks originating from Dongi-Dongi at 2 stations and to determine the composition of gold to silver minerals in rocks fixed to definite proportion. This study used secondary data, which were the result of rock analysis from Dongi-Dongi. The analysis showed that the gold composition from the three samples at Station 1 ranged from 0.01 to 0.99%, and the composition of silver ranged from 0.02 to1.46%. While the composition of gold at Station 2 ranged from 0.01to 2.55%, and the composition of silver ranged from 0.07 to3.02%. The results of the similarity analysis test of two variances and more than two variances showed that the composition of gold to silver has the same ratio in each sample, with Fcount <Ftable, then H0 is accepted. Therefore, it can be concluded that the ratio of gold to silver in each sample is the same, and follows the Law of Definite Proportion as stated by Proust that a chemical compound consists of elements with a mass ratio always remains the same. In other words, each sample or compound has a fixed composition of elements
Capability of coffee commodities through impact of multiplier and related sectors to the East Java Province economy
Authors: Prabowo R U , Hani E S , Hapsari T D , Zahrosa D B
Published: March 2021

The roles of coffee commodities for the Indonesia economy are quite important. They are as a source of income for coffee farmers, foreign exchange sources, industrial raw materials producers, as well as employment providers through processing, and also marketing and trade (export and import). This research was conducted with the aims: (1) To know the impact of multiplier caused by coffee commodities to economy of East Java province.; (2) To know the value of coffee commoditis sector relation to other sectors that support the economy in East Java province. The results showed: (1) Coffee commodities have an impact of multiplier on East Java province’s economy of 1.115. It means that if there is a change in demand in coffee sector of one million rupiah while final demand in other sectors does not change; it will increase the use of output of other sectors either directly of indirectly Rp. 1.115.000,-. (2) Coffee commodities have direct and indirect inter-sectoral values of 1,854. It means that if there is an increase in demand for coffee commodities sector of one million rupiah. It will increase the supply of inputs among the whole in the economy of East Java province of 1.854 million rupiah or Rp. 1.854.000,-.
On resolving perfect dominating number of comb product of special graphs
Authors: Aziza M O , Dafik  , Kristiana A I , Alfarisi R , Wardani D A R
Published: March 2021

A set of vertices D ⊆ V(G) is the dominating set of graph G if every vertex on graph G is dominated by dominators. The dominating set of D on graph G is a perfect if every point of a graph G is dominated by exactly one vertex on D. For each vertex υ ∈ V (G), the k-vector r(υ| W) is called the metric code or location W, where W = {w
1,w
2,…,wk
} ⊆ V (G). An ordered set W ⊆ V(G) is called the resolving set of graph G if each vertex u, v ∈ V(G) has a different point representation with respect to the W where r(u|W) ≠ r(υ|W). The ordered set Wrp
Ç V (G) is called the resolving perfect dominating set on graph G if Wrp
is the resolving set and perfect dominating set of graph G. The minimum cardinality of the resolving perfect dominating set is called the resolving perfect dominating number which is denoted by γrpG. In this study, we analyzed the resolving perfect dominating number of comb product operations between two connected graphs, such as Kn
▹ P
2, Kn
▹ P
3, Btn ▹ P
2, Btn
▹ P
3, and Btn
▹ C
3.
Analysis the development of sprider learning models to improve student’s critical thinking skills in natural science learning junior high school
Authors: Puspitasari A D , Suratno  , Yushardi
Published: March 2021

This article dicussses how the SPRIDER learning model is used to improve student’s critical thinking in natural science learning junior high school. Critical thinking skills are a person’s ability to analyze ideas or ideas logically, reflectively, sistematically and productively to help making evaluation and decisions about what is believed or will be done so can solve the problem. The development model used in this study is the Thiagarajan 4-D development model. Result of the need analysis questionnaire, overall 100% of teachers support the development of learning models that are integrated with religious aspects with expectations that it will strengthen the student’s religious character to produce an intelligent and religious generation. The first syntax model for SPRIDER is stimulation; provide a stimulus that student interested in the material to be studied with religious integration. The second stage is problem orientation; provide problems that can improve student’s critical thinking skills. The third stage is reading; student read material related to the problem given. The fourth stage is investigation; students conduct investigations in groups to solve problems. The fifth stage is discussion; students dicuss in their groups to find solutions. The sixth stage is evaluation; the last stage where the teacher will evaluate the learning activities that have been implemented to determine the level of student’s understanding about the material that has been learned.
Improving numeracy skill through leng kali leng traditional game in learning early math to young learners
Authors: Samad F , Salasa M , Ramadali W O R L O
Published: March 2021

The aim of this research was to examine the improvement of counting numbers process in early math among B group students through leng kali leng traditional game. The participants were 20 children from B group. They were in 5-6 years old. A leng kali leng traditional game was used to teach early math. Research method used action research. The qualitative data were collected through classroom observation, check list and students’ worksheet. The improvement of early math process skills were examined through descriptive statistic. Result showed that the early math process skills improved after the intervention of learning. The research also revealed that traditional game was motivating; it provides meaningful contexts for children to play mathematical ideas and skills while reducing the fear of failure and errors, since they can always play again.
Study of Kinematics and Dynamics of motion at Semanggi Bridge Jember, Indonesia as a contextual in Physics Learning
Authors: Astutik S , Supeno  , Prastowo S H B , Prihandono T , Bektiarso S
Published: March 2021

Some facts show that students often have difficulty in studying the kinematics and dynamics of motion. To overcome these problems, it takes learning experience that can help students build their knowledge about physics. One way is to connect the material physics with contextual phenomena because basically everything in nature can be learned based on physics studies. Semanggi Bridge located in Jember district is a connecting bridge that has a unique shape with three paths in the form of down, circle, and straight path. The studiesresults of kinematics and dynamics of motion on sloping and flat trajectories obtain physics quantities, ie position, distance, displacement, speed, velocity, kinematics and dynamics of motion on circular paths obtain physics quantities, ie angular position, angular velocity, angular acceleration, centripetal acceleration, centripetal force, and maximum speed. The studiesresults of kinematics and dynamics of motion can be used as a basis for designing contextual learning resources such as subject matter, sample questions, laboratory activities, and exercise questions related to contexts of physical phenomena.
Multiple representation based physics learning to improve students learning outcomes at SMAN 3 Jember on projectile motion materials
Authors: Abdillah U F , Mahardika I K , Handayani R D , Gunawan G
Published: March 2021

This research informs about multiple representation based physics learning. Multiple representation is an alternative learning strategy that is very important in physics. The delivery of material in various representations in the form of verbal, mathematical, picture and graphic will provide variations in the learning process so that it can make it easier for students to capture learning material. This is the advantage of multiple representation based learning. This study aims to analyze physics learning based on multiple representation of the learning outcomes of SMAN 3 Jember students, especially on Projectile Motion material. The type of research is quantitative descriptive with respondents consisting of 52 students of class XII MIPA SMAN 3 Jember. Respondents were given a pretest and posttest which consisted of 10 multiple choice questions including verbal, graphic, picture, vector and graphic representations. The research data obtained were analyzed by looking for the N-gain value to determine the category of increasing multiple representation based physics learning on student learning outcomes. The N-gain value obtained at 0.47 indicating that there was an increase student learning outcomes with the medium category.
Feasibility of learning instrument with sainti-ka (characteristic of scientific) of Junior High Scholl on environmental pollution topic
Authors: Pasani C F , Putri R F , Yulinda R
Published: March 2021

This study aims to produce valid learning instrument with sainti-ka on environmental pollution topic to build the character of curiosity and responsibility of 7th grade of junior high school with scientific approach. This study was a research and development study. Borg and Gall development model was modified and used include only Define, Design, and Develop. This study produced learning instrument consisted of silabus, lesson plan, student work sheet, and achievement test. The results showed that the developed learning instrument are feasible to use and in the very good qualification.
Training and implementation of google applications for online learning in the pandemic covid-19
Authors: Herlina  , Lagandesa Y R , Azizah  , Asriani
Published: March 2021

Knowledge of the concepts of online learning and teacher skills in the use of information technology, is an important factor of online learning in the pandemic covid-19. Facts show that teachers’ knowledge and skills in online learning and the use of information and communication technology are still low. On the other hand students are prohibited from bringing mobile devices to school, with the reason to interfere with the lesson. Teachers and schools need to get help and guidance, so they can maximize learning even in the pandemic. The problem raised is how to improve the skills of teachers in online learning during the co-19 pandemic? The purpose of this activity is to provide skills as well as an understanding of how to use information technology for effective, efficient and safe learning from negative stigma that has been feared by schools and teachers. This activity using the guided training method and was carried out in four stages namely observation, training, mentoring and evaluation. The results of the activities showed that the training and technical guidance of online learning based on google application improve the skills of teachers in online learning
Reconstruction of HOTS problems based on questions in mathematics textbook
Authors: Tanujaya B , Mumu J
Published: March 2021

The purpose of this research was to reconstruct HOTS questions using questions in mathematics textbooks. The study was conducted used a research and development method. The objects of research and development were questions in mathematics textbooks using in junior high school. The research procedure consisted of collecting and selecting textbooks in mathematics instruction, selecting the topic of the subject, identifying and selecting problems, and reconstructing HOTS items. The item reconstruction phase included expert judgment and field trials. HOTS problem reconstruction was carried out through the improvement of questions in the textbooks so that the answers were not unique; the solution required several mathematical concepts and the use of other knowledge. The results showed that questions in mathematics textbooks could be reconstructed as HOTS questions. HOTS problem reconstruction can be achieved by changing the problem in such a way that it does not have a single solution, using a variety of mathematical concepts and other knowledge.
Scaffolding worksheets as a medium of student learning during the COVID-19 pandemic in constructing proof of group problems
Authors: Warli  , Rahayu P , Cintamulya I
Published: March 2021

Students have many difficulties in constructing proof of the statement, plus the Covid-19 pandemic conditions, students study at home. For that, we need media that help the student’s difficulties in constructing proof while studying at home. This study aims to describe the ability of students during the Covid-19 pandemic in constructing proof of group problems, after being given the media scaffolding worksheets. The trial was conducted online, after learning the exercises were given evidentiary problems through scaffolding worksheets with the topic Group. To find out the ability to construct a proof, test, and interview are given based on the student’s proof answers. Interview guidelines are prepared to refer to indicators of construction proof. For this reason, this research is qualitative descriptive research. The research subjects were students of Unirow Tuban Mathematics education who took the Algebra Structure course. The design of scaffolding worksheets refers to the mapping of construction evidence indicators, and the level of scaffolding developed by [32]. The results showed that the ability of students in the initial steps of proof, proof of flow, using related concepts, the argument of proof, and the language of proof had very good improvement. So the ability of students to prove group problems after using scaffolding worksheets increased.
The development of online interactive learning media by using google classroom assisted by geogebra software on the quadratic function material
Authors: Monalisa L A , Susanto  , Fatahillah A , Prihandini R M , Hussen S , Fajri E D R
Published: March 2021

Technological developments are currently entering the industrial revolution 4.0 where everything is digital based. Learning media are tools used by educators in carrying out learning activities. One of the learning media that can be applied in learning mathematics is GeoGebra software. However, the GeoGebra software does not interact between educators and students, so we need a Google Classroom to improve interactive learning that can be combined with GeoGebra Online. The process of developing interactive online learning media using Google Classroom were assisted by GeoGebra software on quadratic function material used the Thiagarajan development model which consisted of four stages, namely define, design, development and dissemination. The results of learning media validation fulfilled the validity criteria with a correlation coefficient based on the validation sheet of 0.92 which is included in the valid category with a very high interpretation. Practical criteria with a percentage of the average value of the user response questionnaire based on a user response questionnaire of 91.75% which is included in the practical category with a good percentage. The effectiveness criteria with the percentage of learning outcomes based on the learning outcomes test was 82.61% which is included in the effective category with a very good percentage. The development of instructional media tested at SMA Muhammadiyah 3 Jember has fulfilled three criteria, namely valid, practical and effective.
Experience in Retrofitting the Mineral Processing Equipment to Intensify the Gravity Recovery of Gold
Authors: Semenova L A , Shaldybin D A , Semenov D S
Published: March 2021

The experience of replacing a Knelson concentrator with MOD 2 and MOD 3 jigs at the gold recovery plant of the Karalveem deposit is described. Due to the change in the source product quality (an increase in the amount of finely disseminated gold from 17 to 75 % of the total gold obtained), the Knelson concentrator performance at stages 4 and 5 was unsatisfactory. It was decided to retrofit the equipment and replace the Knelson concentrator with the MOD 2 and MOD 3 jigs. The gold in the Karalveem deposit ore was briefly characterized by size as fine, dust, and medium-round gold, and the mineral composition of the Karalveem deposit ore samples considered. Statistically significant results of testing before and after retrofitting (replacing the Knelson concentrator with MOD 2 and MOD 3 jigs) have been represented. The efficiency of the MOD type jig installation has been evaluated. The authors have concluded that industrial testing the recovery of fine, dust, and medium-round gold on the MOD type jigs can be performed at any mine to process this type of ores, and these jigs may compete with Knelson concentrators that have already gained popularity.
Solution of Problems to Ensure Road Safety by Means of Intelligent Transport Systems
Authors: Vasilchenkova D G
Published: March 2021

The article is devoted to intelligent transport systems based on short-range radio technology (DSRC). The main feature of this type of system is the ability to provide communication between vehicles without the direct involvement of drivers and without access to the global network. This allows to solve a number of problems related mainly to road safety. This article is about collision prediction and the detection of dangerous driving elements. For these problems, mathematical models of their solution are given, a description of the basic terms of the proposed algorithms, and the results of simulation experiments delivered using the traffic simulator Simulation of Urban Mobility are presented. The model for prediction of vehicle collisions is based on methods for approximating vehicle trajectories and their pairwise comparison. The detection of dangerous driving elements is based on the statistical processing of a number of vehicle motion parameters in the visibility range of the such DSRC device.
Solid Municipal Waste Management Through Social and Environmental Mapping
Authors: Prelikova E A , Zotov V V , Karjakina P M
Published: March 2021

When considering environmental safety issues, much attention is paid to problems related to the management of solid municipal waste in courtyards and landfills. One of the most effective ways to reduce the environmental burden on the environment is to collect waste separately. The relevance of the research topic and the degree of its scientific development give rise to the formulation of a scientific problem as a contradiction between the need for waste management and lack of public awareness of the features of the separate collection system and its absence in residential areas. Solid municipal waste management is based on socio-ecological mapping, which provides an adequate reflection of the environmental situation. The authors have developed a map of equipped sites for separate waste collection on the example of the city of Kursk, which allows you to get information about garbage collection sites both for the city as a whole and for individual neighborhoods.
Highly Effective Fire Extinguishing Mixtures of Iodinated and Fluorinated Hydrocarbons as a Way to Reduce Greenhouse Gas Emissions into the Atmosphere
Authors: Kopylov S N , Kopylov P S , Eltyshev I P , Kopylov N P , Begishev I R
Published: March 2021

One of possible ways to reduce the volume of the use of hydrofluorocarbons (HFCs) as gaseous fire suppressants is studied in the paper. Extinguishing mixtures of HFCs and some fluoroiodocarbons are investigated. It is theoretically predicted that fluoroiodohydrocarbons are effective inhibitors of conversion of fluorinated alkanes in a flame. Special experimental equipment allowing to measure fire extinguishing concentration of gaseous fire suppressant having high boiling point is described. Experiments show that fluoroiodohydrocarbons are effective means of reducing the use of gaseous fire extinguishing agents based on fluorinated alkanes, which are greenhouse gases: in the presence of insignificant addition of iodized substance the volume of fluorinated alkanes required for the extinguishing decreases several times. Creation of mixtures with the content of iodized components higher than 5 mass. is impractical because in this case the iodine-containing substance will exceed safe level of its use from the point of view of toxicity
Safe Operation of All-Wheel Drive Articulated Dump Trucks on Large Slopes in Deep Open-Pit Mines
Authors: Glebov A V
Published: March 2021

The analysis have been carried out for the production of all-wheel drive articulated dump trucks. The practical experience of operation of dump trucks as open-pit transport has been analyzed. The paper describes the technical characteristics of some models of articulated dump trucks of Russian and Belarusian production. The paper describes the examples of transportation of rock mass at enterprises of Russia and abroad. The paper points up the special aspects for making the organizational, technological and design decisions in the implementation of articulated dump trucks. The paper shows the experience of operation of all-wheel drive articulated dump trucks in open-pit mining. It has been established that articulated dump trucks allow to increase the efficiency of mine development at the stage of construction and commissioning of mining and processing plants, especially in geographically remote and inaccessible territories The measures have been developed for safe operation of all-wheel drive articulated dump trucks in open-pit mining at the development of deep-seated mineral deposits.To implement the program of import substitution of all-wheel drive articulated dump trucks it is necessary to perform market research to study the possible market of consumption of vehicles of this class at open-pit mining operations in order to justify the prospects for provision of the Russian production market.
Studying Noise Pollution in Vladivostok
Authors: Ugay S M , Kaminskiy N S , Permyakova O G , Ovsyuk M A
Published: March 2021

The issue of the growing harmful impact of traffic noise on city residents has been relevant for years. Today, protecting the population from exposure to increased noise is essential. Residents of cities are more susceptible to noise. The study objective is to assess the degree of traffic noise impact on the population of Vladivostok. The data obtained will allow identifying the most acoustically unfavorable areas for further research to plan specific noise-reducing measures.
Hydrate Modeling Filtration of Salt Liquid-Ice Solutions and Gas Mixtures with Splitting by Physical Processes
Authors: Alekseeva N Yu , Podryga V O , Poveshchenko Yu A , Rahimly P I , Rahimly O R
Published: March 2021

The filtration model of the hydrate-equilibrium zone (HEZ) in the mixture of liquid-ice solutions and gas with possible solid-phase salt sedimentary inclusions in a porous medium is studied. Various types of saturating the liquid-ice mixture with gas and salt, as well as salt sediment in HEZ in the absence of a liquid phase are considered. Based on the Gibbs phase rule, various types of dissociative bonds between thermodynamic variables in the problems under consideration are determined for systems with one thermodynamic degree of freedom.
Comprehensive Methodology for Choosing a Rational Route for Road Transport When Transporting Dangerous Goods
Authors: Kuzmin A V , Gorina L N , Demin A
Published: March 2021

The General trend in the development of the technosphere implies a constant increase in the volume of transport of dangerous goods by road. The combination of "dangerous cargo and vehicle" is potentially dangerous because it can pose additional risks to road users, as well as to the environment (nature and population). For this reason, it is necessary to conduct appropriate risk analyses for the transport of dangerous goods by road, which makes it possible to assess such risks.
Improvement of Textile Waste Sorting Processes
Authors: Girfanova L R , Abdyrasulova R R
Published: March 2021

The transition to digital technologies in industry allows to streamline the processes of production, operation, disposal and processing of products. The recycling and management of raw materials is an important issue for textile industries and is receiving increasing attention. For mechanization and automation of waste sorting, the article proposes an aggregate, and for removal of zippers from clothing - an installation, the use of which allows to reduce their volume of textile waste in landfills, reduce their negative impact on the environment and use as secondary raw materials.
Heavy Metal Contamination of Urban Soil in Novosibirsk
Authors: Storozhko I , Krasovskaya A , Udal’tsov E
Published: March 2021

This paper focuses on the problem of urban soil contamination with heavy metals in Novosibirsk city. The concentrations of mobile forms of heavy metals in soils of district of Novosibirsk affected by a non-ferrous metallurgy plant (Novosibirsk Tin Plant) were assessed. Soil samples were taken at 9 sites. Flame atomic absorption spectrometry and inductively coupled plasma mass spectrometry were employed for chemical analysis of the heavy metal contents. The study demonstrated that the maximum permissible concentrations (MPCs) for arsenic, lead, nickel, cadmium, copper, zinc and chromium were exceeded in the analysed samples and the concentration of mercury is in normal levels. The concentration of heavy metals decreased with increasing distance from the plant. According to the integrated pollution index soil contamination is classified as extremely hazardous.
The Study of Slip at the Surface in Terms of Carbon Dust
Authors: Shabelskaya N , Polyakova Y , Vyaltsev A
Published: March 2021

In this paper, an experimental study of the dependence of the coefficient of friction in the "sole-floor" system under various conditions is carried out. During the test, a tile was used as a support surface. Part of the sole of a special Shoe was placed on a tile and, slowly lifting the tile, determined the angle at which the movement of the Shoe sample begins. The sole and surface of the tile were specially prepared: cleaned before testing or applied a layer of graphite, rubbing into the surface. The studies were performed under various conditions: a clean Shoe sample and a clean surface, a Shoe sample and a surface contaminated with graphite dust. A graphite electrode powder with a grain size of no more than 0.1 mm was used as graphite dust. Graphite was applied to the tile surface in the form of a loose layer, or with a small seal. Analysis of the results shows that the highest coefficient of friction occurs between a clean Shoe sample and a clean floor surface, which is difficult to achieve in real production conditions. This combination is the safest in production conditions. The lowest coefficient of friction is obtained when a Shoe sample contaminated with graphite slides when there is a loose layer of graphite on the floor surface. This leads to the conclusion that it is necessary to clean the floor surface and shoes from carbon dust to ensure a safer environment for production workers in the presence of carbon-containing dust in the air of the working area. The results obtained can be useful for developing recommendations on the organization of safe working conditions at enterprises associated with the processing of carbon-containing materials.
Development of Functional Food Technology for Food Security in the Regional Aspect
Authors: Skripko O V , Bodrug N S
Published: March 2021

Ensuring food security is one of the main tasks of the state. The food security doctrine approved by the President of the Russian Federation, among other tasks, provides for the production of high-quality and safe food products that are accessible to all segments of the population and can support the health of consumers. Achieving food security in the far Eastern region is possible through the use of regional sources of agricultural and wild-growing raw materials. For the production of functional beverages, soy whey is used, obtained in the production of tofu from safe, non-genetically modified soy, pumpkin, carrots, cranberries and blueberries. The inclusion of these components in the recipe makes it possible to obtain drinks with a rich chemical composition, containing soluble protein fractions, a small amount of fat, carbohydrates, including dietary fibers (pectin substances) that have probiotic properties, minerals and physiologically functional ingredients (α-carotene, vitamins C, E, lycopene and succinic acid) and high organoleptic indicators. Soft drinks obtained by the developed technology can be classified as healthy food products.
Development of a Method of Luminescent Analysis of Grain Products Grinding Degree
Authors: Kulikova M G , Belyakov M V , Samarin M D
Published: March 2021

The aim of this work is to develop a luminescent method for assessing the quality of grinding of grain processing products. In the course of the study, we studied luminescent characteristics of peas and lentils, as well as their grinding on a spectrofluorimeter. The spectra were measured by means of a synchronous scanning, then were measured excitation and luminescence spectra, which was followed by calculation of integral parameters, namely the excitation energy and the luminescence flux. The excitation spectra of pea grindings have maximums at wavelengths of 288, 362 and 424 nm, and of lentils grindings reach 288, 424 and 530 nm. In the range of 410-470 nm, the dependence of the excitation energy on the grinding diameter is systemic. The dependences of the photoluminescence flux on the average particle diameter can be approximated with sufficient accuracy by means of linear regression models. The express-analysis technique developed on the basis of these models of analysis of the average particle size of the fractions in the grinding includes sample preparation, excitation and registration of photoluminescence, amplification of the received signal, and size determination based on previously obtained calibration curves. The technique can be applied in grain processing and food industries.
Food Supply and Its Security in the North: Regional Aspect
Authors: Tarasov M E , Darbasov V R , Tarasova-Sivtceva O M
Published: March 2021

The article deals with the need to increase the competitiveness of rural areas in the food supply market with local products for the population of the republic. The necessity to strengthen the protectionist economic social policy of the state for the North regions development and create conditions for the effective functioning of the agricultural sector of the economy is justified. We raises the question about necessity to maintain state support and government regulation at both the regional and federal levels in order to ensure employment of the rural population, increase the level of its income, preserve local traditions, and classify agriculture in the Republic of Sakha (Yakutia) as a traditional sector of the North’s economy.