bluuebunny/crossref_metadata_2025_split huggingface dataset:
Abstraction ability in number patterns problems
Authors: Adelia V , Susanti E , Sari N , Simarmata R H 
Published: May 2020

Abstract
This study aims to describe number patterns problems that are designed to measure the abstraction ability of junior high school students. This study was design research which consists: preliminary design, focus group discussion, trial, interview, and retrospective analysis. The instruments used in this study were test and interview to measure abstraction ability that has 5 indicators, which are: specialization, observation of pattern, generalization, conjecturing and testing conjecture. The subjects of this study were 3 students in grade 8 and the data analysis used in this study was qualitative. As a result of this study, the problem can be used to measure students’ abstraction ability.
Analysis of student’s thinking ability to solve higher-order thinking skills (HOTS) math problems
Authors: Megawati  , Hartatiana  , Wardani A K 
Published: May 2020

Abstract
This study aims to describe students’ thinking skills in solving mathematical problems which are Higher-order Thinking Skills (HOTS) problems. The thinking process used in this study refers to Bloom’s Taxonomy was modified by Anderson and Krathwohl. It was a qualitative descriptive study conducted at SMP Xaverius 1 in Palembang. There were 30 students of grade IX involved as subjects in this research. The data collection techniques used were tests, documentation, and interview. All students involved were given two HOTS questions. Based on the analysis of student answers and interviews, the results obtained stated that only 6.67% had reached the create stage in completing HOTS questions, the rest did not even reach the analysis stage.
Students’ statistical reasoning reviewed from academic internal factors in two learning classes
Authors: Cahyawati D , Wahyudin  , Prabawanto S 
Published: May 2020

AbstractThis paper presents the research results about the profile of students’ statistical reasoning ability (SRA) based on their academic internal factors, namely statistical prior knowledge (SPK), the intensity of study, and length of time to study. Data was collected from the seventy students of mathematics educations in a year of 2018/2019 that divided into two learning classes. One class was determined randomly as an experimental group and another class as a control group. The SRA and SPK achievements were measured by a written test. The aged of students ranged from 19 to 22 years. Based on gender, there were about 71% of females and 29% of males. The result of the study showed that the most answered about the intensity to study was “seldom”. They used the length of time to study for reviewing the statistics topic for about one to two hours. Both of the intensity to study and the length of time to study was not a significant effect on the difference of students’ SRA achievement between experimental and control groups. The difference in learning model was not the only one factor that significantly influenced the difference of students’ SRA achievement. The difference of the SPK factor produced the difference of the SRA achievement between experimental and control groups. Nevertheless, there was no interaction effect between the learning model and the level of SPK to the difference of the students’ SRA achievement.
Students’ mathematical reasoning in inquiry learning model
Authors: Helviyana G , Susanti E , Indaryanti  , Sari N , Simarmata R H 
Published: May 2020

Abstract
This research is a descriptive study that aims to identify student’s mathematical thinking in aspect reasoning on grade XI in topic sequences and series through the inquiry learning model. The test is consists of one problem. The subject for this research were 3 students of XI IPA 1 class at SMA Negeri 1 Indralaya Selatan. The learning process adjusted with the inquiry phases. The data collection techniques used in this research are written tests and interviews. The result of this study indicates that subject 1 (S1) appears inductive reasoning only on the perception of generality and expression of generality in which logical analysis is gathering facts, assessing or proposing assumptions, and setting conclusions. Subject 2 (S2) appears all indicators of inductive reasoning and indicators of logical analysis, and subject 3 (S3) appears all indicators of inductive reasoning while indicators of logical analysis are submitting assumptions, assessing or testing assumptions, and setting conclusions.
Analysis of student’s proof construction on matrix determinants
Authors: Sari D , Hapizah  , Scristia  
Published: May 2020

Abstract
This research is a descriptive qualitative research which aims to describe the construction of student evidence on the determinant matrix material. Construction of evidence is compiling evidence from a statement based on the definitions and rules used. The research subjects were students of class XI IPA Palembang 11 Public High School consisting of 42 people. The learning process takes place in accordance with the steps of direct learning. The data collection technique used is a written test consisting of three problem descriptions. The data collected was analyzed by evaluating the evidence from the results of student work consisting of four assessment categories as follows: valid arguments, proofs and proofs that were completed (K
1) valid arguments there were mathematical manipulation errors in the proof process (K
2), valid arguments but there are mathematical manipulation errors in the process of proof and proof of unfinished (K
3), empirical arguments, invalid or incomplete (K
4). Student proof construction in K
1 category was 34.52%, K
2 category was 16.67%, K
3 category was 22.62%, and K
4 category was 26.19%.
Students’ perception of reading and understanding mathematics textbook
Authors: Asri L , Oktalidiasari D , Darmawijoyo  
Published: May 2020

Abstract
This study aimed to describe the students’ perceptions of reading and understanding mathematics textbooks. This type of research is descriptive. Participant study consisted of 5 students in the sixth grade of Al-Fadh Islamic Elementary School Palembang. Data collection techniques in this research were questionnaire sheets to determine students’ stages in reading mathematics textbooks and students’ perceptions in understanding mathematics, and the interview was used to make sure their perceptions. Results of questionnaire sheets and interviews were analyzed based on stages of reading mathematics textbooks and students’ perceptions in understanding mathematics as follows: (1) Reading definitions or rules, (2) Reading example problems and (3) Doing problem exercises. Results showed that: The stages that are mostly done by Islamic elementary school students Al-Fahd in reading and understanding sixth grade mathematics textbooks are category 1, namely reading definitions or rules - learning example of problems - doing exercises about 3 students with a percentage 60% while category 2 is reading definitions or rules - learning example of problems - doing exercises for student with a percentage of 20% and category 3 that learning sample questions - doing one question exercise for a student with a percentage of 20%. As for students’ perceptions of understanding mathematics, the most is to understand examples of problems as many as 3 students with a percentage of 30%, understand the definition or rules of 1 student with a percentage of 20% and can do exercises about 1 student with a percentage of 20%.
The effect of students’ mathematics views on how they read math textbook
Authors: Islamirta K A , Chaniago R R , Darmawijoyo  
Published: May 2020

Abstract
This article describes students’ view in mathematics on the way they read mathematics textbook. This study is descriptive that aims to know about the affect of students’ mathematical views on how they read math textbook and what is the solution that supposed to do for making the students understan the whole mathematics textbook. The population of this study is the students in ninth grade at Junior High School Bina Tama Palembang. There are two data collection techniques, those are questionnaire and interview, so the data is obtained from the results of the questionnaire distributed to students and recorded during the interview process. The results shows that the students who think that they understand mathematics when they are able to do worked exercises, and they purpose to read mathematics textbook in final is also when they do the exercises.
Development of an online-based instrument prior knowledge on the concept of cellular respiration
Authors: Dewi S P , Zen D , Haryani M E 
Published: May 2020

Abstract
This research aims to produce valid and reliable prior knowledge questions on the concept of cellular respiration online by utilizing Google form media. The questions developed in this study are multiple choice questions with a four-tier test type. The sample in this study were students who took general biology courses at Faculty of Teacher Training and Education (FKIP) of Universitas Sriwijaya. Samples play a role in the evaluation process after prototype I was produced, at one-to-one (n = 13) and small group (n = 23) stages. The instrument used in the data collection process was a walkthrough, question readability questionnaire and questions. The questions given to the sample consisted of multiple choice questions on the grounds of open-ended questions (the development stage) and four-tiered multiple-choice test questions (the small-group evaluation stage). The use of the Goggle form in this study was carried out at the stage of giving open-ended question questions and the evaluation process at the one-to-one and small group stages. The results of this study indicate that the prior knowledge questions that have been developed are categorized as valid with an expert review rating of 80.5% and the reliability of the categorized questions is weak with a value of 0.37. The results of the expert review assessment revealed that the items developed were in accordance with the understanding of the concepts to be measured. Findings from the results of this study can be used as a reference for developing prior knowledge questions with the type of four-tier test to detect students’ understanding before learning is done. Thus the teacher is expected to choose the right learning strategy before the learning process.
Velocity profiles at non-stagnation point of viscous fluid passes a sliced sphere contains magnet
Authors: Nursalim R , Agustiani R , Muslimahayati  
Published: May 2020

Abstract
This paper will be presented to explain the velocity profile of viscous fluids at non-stagnation points when the fluid passes through a sliced sphere contains magnet. The design of this study was an experiment using computer simulations based on mathematical models built. Mathematical models and coordinate systems are built based on physical phenomena and are composed of continuity equations and momentum equations. The model was converted to a non-dimensional model and solved by the Keller Box numerical method. Numerical simulations are carried out by varying the incision angle and looking at the fluid velocity profile that occurs. The simulation results show that if magnetic parameter is not included then the velocity will be different at each point, the greater the observation angle the greater the velocity. If magnetic parameter is included then the velocity will tend to be the same. If an observation angle hold on any value then the greater the magnetic parameter the greater the velocity.
Development of HOTS (higher order thinking skills) test instruments for the concept of fluid and harmonic vibrations for high schools
Authors: Akhsan H , Wiyono K , Ariska M , Melvany N E 
Published: May 2020

Abstract
The thinking ability of Indonesian students is still relatively low, this can be seen from the ranking of Indonesia based on the results of TIMSS in 2015. To improve students ‘thinking abilities and provide reinforcement to students’ abilities, one of the efforts is to equip students with higher-order thinking skills by using questions HOTS is based on the Borg and Gall development model. A Higher Order Thinking Skill (HOTS) instrument has been developed that is subject to a valid and reliable fluid subject in high school using the Borg and Gall development model. This study aims to: 1) produce HOTS physics questions based on a valid and reliable Borg and Gall development model. The trial was carried out in SMAN 3 Palembang with class X MIA 1 students as research subjects. The data collection instruments used consisted of questions grids, question sheets, and validation sheets. The data analysis technique used is item analysis consisting of validity, difficulty level, and different power analysis, and reliability testing. The results of this development are 15 valid questions out of 25 items created. Of the 25 items, 3 items were declared difficult, 20 items had a moderate level of difficulty, and 2 other items were relatively easy. In addition, these questions are also stated to be reliable with a Cornbach’s Alpha value of 0.78. The results of this study indicate (1) data collection as a validation test with an expert lecturer of 4.5 which is very valid. (2) a reliable test in the initial field test stage obtained an average score of the reliability of stages one and two respectively 0.74 and 0.76 with a high level of reliability. Thus, based on the results of the research data it was found that the instrument about HOTS fluid material developed was classified as valid and reliable.
Preface
Authors: Antokhina Yu A , Ovodenko A A , Okrepilov V V , Kovalev I V , Voroshilova A A 
Published: May 2020

Abstract
Overview of the International Conference on Metrological Support of Innovative Technologies – ICMSIT-2020
The overview describes the main directions and results of the International Conference “ICMSIT-2020” held in St. Petersburg in March 4, 2020. It gives the details about the participants and the proceedings. The anchor partner of Krasnoyarsk Science and Technology City Hall was St. Petersburg State University of Aerospace Instrumentation. A description of the main trends in modern innovative technologies, engineering and industrial physics as well as in the development of the second Forum “Metrological Support of Innovative Technologies” by the St. Petersburg State University of Aerospace Instrumentation is given in the overview.
Improving the radiation-thermal stability of titanium hydride
Authors: Yastrebinsky R N , Karnauhov A A , Yastrebinskaya A V 
Published: May 2020

Abstract
The paper presents the results of studies of the thermal stability of titanium hydride and titanium hydride containing a borosilicate framework. It is shown that the presence of chemically attached boron atoms on the surface of titanium hydride particles increases the initial dissociation temperature of titanium hydride. The phase composition and imperfection of titanium hydride crystals in the temperature range of 100-700 °C were studied. An increase in the defectiveness of the structure of a titanium hydride crystal during its heat treatment is shown. Mechanisms for modifying the surface of titanium hydride by surface assembly and the creation of a borosilicate framework have been established. It was shown that the ongoing structural-phase transformations in the borosilicate coating activate solid-phase interactions and contribute to the fixation of borosilicate. Based on the data of thermogravimetric analysis, it was shown that the modification of titanium hydride increases its thermal stability by 185 °C, shifting the onset of dehydrogenation processes to the high-temperature region from 463 °C to 649 °C.
Automatic control system for operation modes and calibration of technological parameters of evaporation cooling apparatuses
Authors: Merentsov N A , Lebedev V N , Persidskiy A V , Golovanchikov A B 
Published: May 2020

Abstract
The paper provides the scheme and algorithm of the automatic system controlling the operation modes of evaporation cooling apparatuses for industrial recirculating water of local recirculating water supply systems. The authors have described the principle of parameter registration and the automatic calibration of the main parameters at the commissioning stage and during the operation of heat and mass transfer technological equipment. The authors have developed a new approach to the use of elastically deformable heat and mass transfer packing blocks and wastes from metalworking machines as packing contact devices for evaporation cooling apparatuses. Compressed blocks of metal shavings can be volumetrically elastically deformed which allows adjusting operation modes automatically and solving partly a very serious problem of disposing industrial wastes from machine-building enterprises. The article also covers developing of evaporation cooling apparatuses.
Robotization in the production of dairy, meat and fish products
Authors: Khoroshailo T A , Kozub Y A 
Published: May 2020

Abstract
In the current conditions of a market economy, for the more complete automation of technological processes for the production of meat, dairy and fish products, and especially when frequent changes in the product range (assortment) are needed, the use of robots and robotic flexible technologies is extremely important. The possibilities of using robots and flexible robotic systems for more complete automation of technological processes for the production of meat, dairy and fish products are considered. The main directions of the development of technological progress in the mechanization and automation of animal husbandry and their impact on improving process technology, the use of digitally controlled technologies, increasing labor productivity, reducing costs, improving product quality, and protecting the environment are outlined. It is noted that one of the important areas of technological progress in the modern period is the comprehensive modernization of existing facilities.
Technological process intensification trends in livestock
Authors: Komlatsky V I , Podoinitsyna T A , Kozub Y A 
Published: May 2020

Abstract
In the article aspects of intensification of technological processes in livestock rearing, such as harvesting, storage and processing of forages, weighing and dosage of feed, feeding and drinking of animals, controlling their production, identification of each animal, production of technical products are considered. In animal husbandry, many complex technological processes are considered and implemented in the class of autonomous subsystems and each of them, performing a certain task, can be a component of a more complex management system. Some schemes of automation of technological processes, such as the scheme of the raw materials department of the shop of technical products with the use of automation, the functional scheme of automation of the production of fodder flour, the scheme of automation of the process of fat burning are presented. These features are evidence of the need to introduce modern technologies and their intensification in the livestock sector.
Innovative thinking development in engineers
Authors: Sokolov K O , Sergeicheva I A , Sokolova M I 
Published: May 2020

Abstract
Innovative thinking may be considered as a certain type of thinking both “serving” engineering and ensuring its success. Innovative thinking is to become a basic resource of experts in engineering. The article defines main components of innovative thinking (technical thinking, creative thinking and critical thinking). The authors study the problems of training experts in engineering in Russian universities. The recommendations on developing critical thinking in experts in engineering have been worked out.
Implementation of WorldSkills standards in the system of training specialists in mechanical engineering and engineering system
Authors: Chumakov L L , Epishkin V E 
Published: May 2020

Abstract
The article discusses the use of practice-oriented teaching methods based on the implementation of WorldSkills standards. Such an approach will allow us to systematize and standardize the approach to assessing the results of training specialists in the field of mechanical engineering. This will also make the training system more flexible, will allow you to quickly respond to changing requests from employers.
Key directions of automation of petrochemical production
Authors: Shinkevich A I , Barsegyan N V , Dyrdonova A N , Yu Fomin N 
Published: May 2020

Abstract
The article reveals the role of automation of the main systems of petrochemical production: technological processes, security systems, information management, and electrical equipment. The purpose of the article is to determine the main directions of automation in the petrochemical complex. Based on the study, it is shown how industrial automation affects gross national product growth by optimizing production and logistics operations, labor efficiency, increasing equipment productivity, improving research and development and product development. For example, if the cost of reconstruction is 2-6% of the total cost of a petrochemical enterprise, the resulting effect of automation is estimated at 15-30% of the increase in operational efficiency. It is concluded that integrated control automation systems regularly design, upgrade, and provide comprehensive support for the availability of complex technical systems throughout its life cycle.
Impact of the error of circular control methods on assessing the quality of anti-erosion soil tillage on slope lands
Authors: Vasilyev S A , Vasilyev A M , Fedorova A A , Aleksandrov R I 
Published: May 2020

Abstract
The scientific article considers the impact of the error of circular control methods on assessing the quality of anti-erosion soil tillage on slope lands. The applied control methods are implemented in scientifically based designs of technical control facilities that can provide high measuring accuracy of the parameters, when profiling the soil surface for different slopes of the agricultural landscape of slope lands. It was found that the device error along the measurement path is negligible, since it is theoretically possible to set the scanning angle of 60 or more degrees, while the radial error is restrained, which does not allow setting such limits of angles even when the device arm length is 0.5 m. On the bases of the results of analytical studies, we obtained a graph of changes of the surface width being measured after the passage of the working part, depending on the scanning angle when the mechanism vibrates. The analysis of the graph allows us to conclude that in order to scan the underlying surface in case the working part width of the anti-erosion machine is known or can be predicted within the acceptable error values, it is necessary to change the radius of the scanned circle by changing the arm length. For example, when working part width is less than 0.5 meters, you can use any circle radii. If the width of soil tillage - from 0.5 meters to 1 meter, the circle radius should be more than 0.7 m and the scanning angle should be less than 50 degrees. When the width of the working part of more than 1 meter the circle radius should be about 3 meters that slightly complicates the design of the device since the diameter reaches almost 6 meters.