bluuebunny/crossref_metadata_2025_split huggingface dataset:
Perspective of students’ science communication in science learning: opportunity in developing makerspace STEM learning approach
Authors: Miranti H , Abdurrahman  , Hasnunidah N 
Published: July 2020

Abstract
The demands of the 21st century encourage education in Indonesia so that it is expected to create quality human beings who are able to compete in the global competition in the 21st century by having skills, one of them is science communication skills. This study aimed to describe and analyze the perceptions of students’ science communication which is applied with learning that integrated with Science, Technology, Engineering, and Mathematics (STEM) approach. The study was conducted at junior high schools in Bandar Lampung involving 100 students. The method used in this study was a mixed method with Sequential Explanatory Design. The research instrument used a questionnaire containing 10 oral communication statements and 10 written communication statements that were used to analyze students’ scientific communication profiles. The results showed that science oral communication was good (63.75%), but low (36.25%) in writing. In addition, learning with STEM approach in this context through practicum and project is preferred by students compared to discussion or traditional learning.
Simulation approach of chamber purging experiment by nitrogen gas
Authors: Marjunus R 
Published: July 2020

Abstract
Chamber purging is usually required in a gas sensing research, in order to make a perfect dry air condition (Relative Humidity/RH = 0%) in the chamber. An experiment shows that RH of the cylindrical chamber (volume = 7.5 cm3) never touch 0% (only 32% and 4%) although it was purged by 100 and 300 sccm of synthetic air (consists of 20% O2 and 80% of N2). It was also obtained the same condition when N2 gas was used instead of synthetic air. In order to understand this experiment’s results, a simulation has been done. The simulation approach using a box-form chamber (volume = 9.6 cm3) shows that the combination of the diffusion-convection process of N2 gas is responsible for the results of the chamber purging experiment instead of pure diffusion or pure convection. For the future step, it is needed further investigation (experiment and simulation) in order to reach 0% RH.
Teacher expectation towards interactive multimedia integrated with STEM in learning physics: Preliminary study on geometry optic learning material
Authors: Pricilia A , Abdurrahman A , Herlina K 
Published: July 2020

Abstract
Recently, the challenge of industrial revolution 4.0 has become a discourse in education. Education is a way for a country to face the development of modern science and technology. So, in this time, education requires systematic preparation in making interactive teaching materials as one of the important components in the learning process. This study aims to describe and analyze the perceptions of teachers and students about interactive teaching materials integrated STEM in physics learning. The study was conducted in high school in Bandar Lampung in class XI involving 133 students and 12 physics teachers. The method used is mixed method. The research instruments used were questionnaires and interviews. The results of the study show that the teacher has not fully used teaching materials with interactive multimedia, and the teaching materials used have not been integrated with Science, Technology, Engineering, and Mathematics (STEM), the kind of teaching material that is needed by students and teachers is teaching material that is interactive and integrated with STEM. STEM make it possible to students to explore their ability in Science, Technology, Engineering, and Mathematics. So, it is necessary to develop interactive teaching material integrated with STEM to face the challenges of the Industrial Revolution 4.0 and fulfill competency standards in the 21st Century. The lesson needed for developing interactive teaching materials is geometry optic.
The causalitic learning model to increase students’ problem-solving ability
Authors: Rokhmat J , Marzuki  , Kosim  , Verawati N N S 
Published: July 2020

Abstract
This research aimed to describe the causalitic-learning-model and its’ implementation to increase the Problem-solving Ability (PSA) (causalitic = causality-and-analytic). This research used mixed method of embedded experimental two phases. The model has been implemented at three universities and seven senior high schools (SHS) in Mataram-Lombok-Indonesia in physics on seven undergraduate-subjects (kinematics, Newton’s law of motion, work and energy, impule and momentum, gravity, rigid equilibrium, thermodynamics) and six SHS-subjects (fluid, optical geometry, impulse and momentum, heat, rigid equilibrium, and direct electrical-current). The instruments consisted of pre-learning-task, learner-worksheet, PSA’s problems, and questionnaire. The score of PSA of pre-service-teachers were analyzed with t-test of sign ranks by Wilcoxon but the PSA of SHS-students were analyzed with t-tests, while the responses of questionnaire were analyzed descriptively. The results show that the model is effective to increase the PSA (with significance-level 5%); for pre-service-teachers, the normalized-gain average 0.15-0.53 for low-group and 0.29–0.77 for high-group, while for the SHS’ students, the normalized-gains is 0.20-0.83 and all students give positive responses. The phases of the learning-model include orientation, exploration and causality-development, argument-preparation, and evaluation. This learning-model is very useful as a reference when constructing learning using this model at any discipline and any level of education.
The effect of blended learning setting on students’ critical thinking skills in physics
Authors: Suana W , Ningsih W S A , Maharta N , Putri N M A A 
Published: July 2020

Abstract
This paper reports a study and results of the improvement of critical thinking skills in a blended learning environment in teaching high school physics. The research was a mixed-method quasi-experimental followed by a qualitative survey. Schoology is chosen as a blended platform for this study. The data of students’ critical thinking skills were obtained by multiple choice tests and were analyzed by using n-gain. Moreover, the information on students’ responses to the blended learning model was collected by open-ended questions at the end of learning process. Based on the results of the study, there were significant effects of blended learning on critical thinking skills. It is also reported that students have high interest, ease of learning, and have benefits in increasing their knowledge. It suggests that Schoology-based blended learning model is effective to improve students’ critical thinking in Physics learning process.
The enhanced of photoresponse of ZnO nanorods film-coated by Cu2O
Authors: Maryam S , Dewi A S P , Mufti N , Muyasaroh A F , Taufiq A , Hidayat A , Sunaryono  
Published: July 2020

Abstract
Light detectors are widely used in generating energy from sunlight, medicine, space communications, ozone layer monitoring and missile warning systems, and others. The active materials that potential used as a detector of visible light and UV is ZnO. However, ZnO has a high bandgap of 3.04 eV so it is not suitable for absorbing light at short wavelengths. Cuprous oxide (Cu2O) is a p-type of semiconductor with a small band, therefore it can increase the wavelength absorption range. The aim of this study is to improve the light response of ZnO nanorods by coating Cu2O. The samples were characterized by X-ray Diffractometer (XRD), Scanning Electron Microscopy (SEM), UV-Vis Spectrometry, FTIR, and photoresponse test. The results show coating Cu2O on ZnO nanorods succeeded in reducing the bandgap value, which is 2.47 eV. Reducing the band gap value is in accordance with the photoresponse test. The response of a sample that has a small bandgap is a fast response.
The influence of TiO2 film thickness in Dye-Sensitized Solar Cells (DSSC) performance based on TiO2/Ag@TiO2-ZnO
Authors: Rahman M F , Nasikhudin  , Hidayat A , Diantoro M 
Published: July 2020

Abstract
The effects of TiO2 film thickness in double layer TiO2/Ag@TiO2-ZnO as the photo-anode, on the performance of dye-sensitized solar cells have been investigated. Dye adsorption and band gap of the electrode are paramount importance to enhance the efficiency. With the increase of TiO2 film, thickness is expected to increase dye adsorption while silver (Ag) doping in semiconductor electrode is proposed to reduce the band gap. Experimentally, TiO2 nanoparticle was deposited on ITO glass by a spin coating method as a first layer with varying number of spin coating to obtain different of thickness. Ag@TiO2-ZnO was deposited above the first layer by the doctor blade method. The sample was characterized by using X-Ray Diffraction, SEM cross-sectional, UV-vis spectroscopy, and solar simulator. It is found that the increases TiO2 film thickness in double layer TiO2/Ag@TiO2-ZnO electrode increase the efficiency linearly. The optimum efficiency of 0.31747% was obtained in a double layer DSSC with TiO2 film thickness of 42.54 μm.
The prospective of STEM education: students’ perceptions about the role of interest growth in science literacy
Authors: Aini N , Jalmo T , Abdurrahman  
Published: July 2020

Abstract
This study aimed to describe students’ perception about the role of STEM in growth interest in scientific literacy. The study was conducted in Lampung province of Indonesia, involving 221 junior high school students and interview with 5science teachers. The method used in the research is a mixed method with Sequential Explanatory Design. Data were taken using Questioner, interview and Observation, Data were analyzed using descriptive analysis. The survey results show that students have a positive perception of the STEM approach. The results of the analysis of the STEM Approach most teachers have not utilized the STEM approach to provide an understanding of science. STEM approach not only provides an understanding of student science but also mathematical skills and conceptual understanding in science so STEM learning can support 2013 curriculum learning.
The use of teaching semiotic vectors in the introduction to physics
Authors: Mondolang A H , Poluakan C , Mongan S W 
Published: July 2020

Abstract
The purpose of this study was to produce a semiotic representation-based test instrument with a multiple-choice (MMC) model that could identify vector errors in a valid and reliable manner. This research method uses the Research & Development Model (R & D) which consists of four main stages, define, design, develop and disseminate. This research was implemented to the students of 2nd semester on 2018/2019 Academic Year of physics education study program totaling 25 people. The results shown that through semiotic representation in the assessment instrument based on the multiple-choice model in a valid and reliable way, it could identify errors in understanding vector concepts (weight centers, position vectors, vector lines, and weight center coordinates) of students. From this study, the use of semiotic representations in physics assessment instruments is recommended in vector concept learning in basic physics lectures to identify errors in vector concepts to improve physics teaching.
Validation of audio-based solar system visual aid for special school students
Authors: Widiyatun F , Sumarni R A , Astuti I A D , Bhakti Y B , Okyranida I Y , Dasmo D 
Published: July 2020

Abstract
Making and testing of miniature solar systems intended for students has been carried out and specifically for special school students. The purpose of making this tool is to help the learning process in students with special needs for science materials, especially in the solar system. The solar system visual aid consists of sun with its planets, including from Mercury to Neptune. Planets were designed to move automatically. In addition, this visual aid was also made audio containing explanations for each planet and also the sun. Validation of tools is carried out by material and media experts. The results of the material validation are good. While the media validation is sufficient and received well. This audio-based solar system visual aid is good enough to be used by special school students.
Forecasting for application of formation stimulation to BV6 formations of Las Eganskoye oil field
Authors: Andreev V E , Chizhov A P , Chibisov A V , Mukhametshin V Sh , Gazizov R R 
Published: July 2020

Abstract
Studies described in this paper were aimed at solving a set of problems related to selection, technological justification and design of enhanced oil recovery. Theoretical and laboratory studies of remaining reserves production were conducted, as well as prediction of their efficiency if applied to formation of Las Eganskoye oilfield.
Radioactive content in the investigated granites by geochemical analyses and radiophysical methods around Um Taghir, Central Eastern Desert, Egypt
Authors: Awad H A , Zakaly H M H , Nastavkin A V , El-Taher A 
Published: July 2020

Abstract
Um Taghir area is restricted along a shear zone of the Qena-Safaga road, actually it belongs to the Central Eastern Desert that represents one of the most important occurrences of radioactive elements in Egypt. The current study aims to calculate the content of the radioactive elements of the investigated granitic rocks by radiative methods for the geochemical analyses, are determined by (X-ray fluorescence (XRF) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The average concentrations values of 226Ra, 232 Th are lower than that of world’s average and the average activities in Egyptian soil. While in 40K series is higher than that of world’s average and the average activities in Egyptian soil. The range of measured activities differed widely as their presence in rocks samples depends on their physical, chemical and geo-chemical properties and the pertinent environment.
The physical basis of the vibration of the upper part of the pipe string when drilling wells
Authors: Bashmur K A , Petrovsky E A , Zharnakova M S , Bukhtoyarov V V , Kukartsev V V , Tynchenko V S , Petrenko V E 
Published: July 2020

Abstract
The article discusses the fundamental issues related to the assessment of the dynamics of the top drive system as one of the sources of vibration when drilling wells. The operational parameters of the drive load at which a resonance phenomenon is observed are determined. The optimal parameters for reducing the amplitudes of forced oscillations, their resonance phenomena are revealed. Methods of protecting the derrick and equipment for protecting unbalanced masses of the top drive from vibration are considered. The prospect of using the layout of the columns, including alloy pipes, is to protect the bit.
Enhancing metal processing efficiency based on using a lubricating-cooling agent with ultradispersed diamond powder
Authors: Petrovsky E A , Bashmur K A , Smirnov N A , Gorodov A A , Bukhtoyarov V V , Kukartsev V V , Tynchenko V S , Petrenko V E 
Published: July 2020

Abstract
The present study describes a new technological environment based on ultradispersed diamond graphite powder. The task is to further study effects of lubricating and cooling agent containing diamond nanopowder. The agent is fed into the zone of refinement or polishing of the part while affecting wear and durability of carbide tooling. The impact of the agent on the quality of the surface layer in the processing of heat-resistant steels and alloys is investigated. It also identifies the optimal agent composition when polishing a particular material. Experimental studies established a positive effect of the agent on the treated surface quality and other parameters of clean finishing and polishing of various metals.
Study of the impact of the lubricant-cooling agent with the diamond graphite submicropowder additive on the durability of AISI M2 steel drill bits
Authors: Petrovsky E A , Bashmur K A , Smirnov N A , Tynchenko V S , Bukhtoyarov V V , Gorodov A A , Petrenko V E , Kukartsev V V 
Published: July 2020

Abstract
The present study analyzes the impact of various lubricant-cooling process agents on the durability of drill bits made of AISI M2 (DIN 1.3343) high-speed steel. The research was conducted for a wide range of steels and alloys, namely: 1045, 321H, Mo-PM (molybdenum powder alloy), and W-Ni pseudo-alloy. New lubricant-cooling process agents with diamond graphite submicropowder additive are studied. The optimal composition of diamond graphite additive is revealed when drilling these steels and alloys. Experimental studies established a positive effect of lubricant-cooling process agents with the diamond graphite submicropowder additive on the durability of the drill bits made of AISI M2 steel.
Influence of the charge materials on the quality of cast wheel rims made from AK7 alloy
Authors: Cherepanov A I , Kukartsev V A , Kukartsev V V , Dzhioeva N N , Bets Yu S , Makarchuk I Yu 
Published: July 2020

Abstract
The widespread use of aluminum and alloys based on it in mechanical engineering is determined by high values of specific strength, increased corrosion resistance, as well as the ability to damp vibrations and high energy absorption. These indicators are especially important in the production of cars, as these alloys can reduce product weight and, as a result, the amount of fuel consumed. Reduced weight of cars can reduce harmful emissions into the environment and reduce the pressure on the road surface. Currently, AK7 cast aluminum alloy is the standard alloy for making rims. To obtain an alloy with the necessary properties, it is necessary to take into account the quality of the used charge materials. First of all, this applies to foundry alloys, which are used for alloying and alloy modification. In the study, we studied AlSi10 pig foundry alloy and AlTi5B1 foundry alloy rod.
Processing calibration results for measuring transducers with an integrated sensor
Authors: Emets S V , Polischouk I N , Kudayarov V N 
Published: July 2020

Abstract
The proper production process control is possible only if there is an information-measuring system equipped with a large set of measuring transducers of physical quantities. Currently, measuring transducers with semiconductor sensors are widely used. Along with high sensitivity to the measured value and repeatability of parameters, these transducers are sensible to stray quantities, which leads to additional errors. One way to reduce the additional errors of measuring transducers with an integrated sensor is to apply algorithmic correction, which involves a multifactorial calibration experiment, the processing of the results of which allows obtaining the conversion function. Algorithmic correction solves the issue of linearizing the conversion function and minimizes the effect of influencing factors on the measurement results. The conversion function quality and, consequently, the accuracy of further measurements largely depend on the correctness of the calibration experiment results. Random outliers (spurious errors) in the calibration results inevitably cause a distortion of the conversion function and the further erroneous measurement results. This paper proposes a theoretical justification for the possibility of generating the conversion function of a measuring transducer with an integrated sensor by processing the results of a multifactorial calibration experiment including random parasitic errors. Experimental results are provided to illustrate the effectiveness of the proposed calibration results processing technique, which allows obtaining the correct conversion function in the conditions of distorted initial data.
Using the capabilities of computer modeling in the software and hardware complex “Safe City”
Authors: Kaliuzhnyi A N , Shurukhnov N G 
Published: July 2020

Abstract
In this article, the authors consider the possibility of using the Safe City software and hardware complex to ensure human safety and security when living within specific territories. The prospects and results of using ICT and mathematical modeling of processes occurring in a certain territory are substantiated. Attention is drawn to the subsystem “Environmental Safety” of the hardware-software complex “Safe City” and the possibility of its use by law enforcement agencies. The approaches to the assessment and mathematical modeling of geodynamic risks arising in a particular territory are investigated. We studied the negative phenomena affecting a person and recorded by means of the APK “Safe City”. The factors contributing to the formation of geodynamic risks in certain territories are analyzed. Forms and methods of using the results of computer modeling of the processes of geodynamic movements in the activities of law enforcement agencies are substantiated. The tasks and functions of law enforcement bodies that are to be aided by mathematical modeling of geodynamic processes in specific territorial systems are highlighted.
Overview of electro physicochemical methods for deburring small-sized high-precision details of coaxial radio components
Authors: Karlina Yu I , Kargapoltsev S K , Gozbenko V E , Karlina A I , Leonovich D S 
Published: July 2020

Abstract
Details of coaxial radio components are small-sized, having high accuracy requirements of up to 7 qualifications, and construction with hard-to-reach surfaces. Burrs on these parts are not allowed by the technical requirements. It is not possible to exclude the appearance of burrs at the stage of blade machining. For deburring, mechanical and electro physicochemical methods are possible. The article provides an overview of electro physicochemical methods for deburring small-sized high-precision parts of coaxial radio components. The features of the application of these methods for these parts, their advantages and disadvantages are given.
Power conditioning unit with independent extreme power control for two sections of small spacecraft solar arrays
Authors: Kiselev P V 
Published: July 2020

Abstract
the article analyzes the main approaches applied in the development process of power conditioning unit (PCU) model to ensure the efficient power use of non-orientable solar arrays for small satellites operated in low Earth orbits with altitudes ranging from 300 to 1500 km. Particular attention is paid to the description of PCU structure choice, as well as the way to achieve the technical specification goals, such as efficiency factor and specific power. A conclusion is made that the optimal structure to ensure PCU efficiency and reliability is the one with a series regulator and section-by-section solar array power extreme control. It is noted that this structure will make it possible to receive power from solar array sections regardless of the difference in temperature and illumination between them. Based on the quantity and duration analysis of the solar battery charge and discharge cycles, the charge and discharge modes of the batteries are defined as basic ones, so the efficiency factor in these modes is maximized. The results of the study described in the article can be used by enterprises specialized in developing small satellites and power conditioning units as a stepping stone for developing a PCU flight model to ensure the efficient power use of non-orientable solar arrays for small satellites.