bluuebunny/crossref_metadata_2025 huggingface dataset:
The change of node importance and influencing factors in China’s high-speed rail network
Authors: liang Xuedong , Liu Rui , Lin Shifeng , Yang Lufan
Published: May 2021

High-speed railway can change the geographical location of cities and enhance the importance of cities. This paper based on the complex network theory, combined with data of 2015-2019 year China’s high-speed railway lines, constructs city as the node of the high-speed railway (HSR) network model, and probed the cities of PageRank in network, examined the high-speed rail network in the change of city node importance, analysed city node importance with time evolution and the regression model was used to determine the high-speed rail network in the city the affecting factor on the changes of node importance. The results show that: (1) Many cities in western China, such as Chengdu, Chongqing, have become significantly more important, while that of eastern coastal cities remains stable or even declines. (2)The level of economic development and population have the most obvious and positive influence on the importance of urban nodes. However, geographical location (latitude) and coastal area have negative effects on node importance.
Computer vision for system protection of elevators
Authors: Lan Shengnan , Gao Yipeng , Jiang Saihua
Published: May 2021

With rapid development of computer vision (CV), traditional elevator control and protection technology have begun to integrate with CV technology in order to improve safety of elevators. By introducing CV technology, the real-time state monitoring of elevator components is realized, the elevator door control system based on CV is proposed, and the abnormal behavior of passengers in the elevator car is identified and alarmed. Based on summarizing the basic principles of CV technology, this paper summarized the application of CV technology in elevator safety from two aspects: equipment safety and passenger safety. Finally, the future trends of CV-based system protection of elevators are discussed.
Landslide monitoring system based on fiber optic sensor and CCD TSL1401CL linear sensor array
Authors: Costrada Aldo Novaznursyah , Harmadi  , Kemal Badrul Mustafa , Marzuki
Published: May 2021

A landslide monitoring system using fiber optic sensor and CCD TSL140CL linear sensor array has been designed. Fiber optic sensor was designed to sense the displacement of lanslide and CCD TSL1401CL linear sensor array was used to measure the rain intensity. The data of landslide and rain intensity send using GSM SIM 900A module to personal computer which paired with GSM Wavecom modem as a receiver. The result of the testing derived that fiber optic sensor which has been designed can monitor the displacement with 0,59 % of error percentage. Monitoring system of landslide can display rain intensity, displacement of landslide, and condition of landslide in real time to PC as early warning.
Flood monitoring system using ultrasonic sensor SN-SR04T and SIM 900A
Authors: Dswilan Sixtinah , Harmadi  , Marzuki
Published: May 2021

A flood monitoring system using ultrasonic sensors JSN-SR04T and SIM 900A have been designed. The system consists of solar panels as a source of electrical energy, JSN-SR04T as a water level detector and SIM 900A as a sent of flood information. The test results prove that the JSN-SR04T has been able to detect 20 cm to 600 cm of distances. The results of the water level produced were 5.0314 mV/cm of sensitivity and 0,.9996 of regression value. The sensitivity states that for every 1 cm of water level there was a change 5.0314 mV of voltage and a regression value close to 1 cm indicated that the sensor was worked properly. The test results also prove that used a buoy produced a smaller of error percentage than not used a buoy, but the measurement not used a buoy can minimize errors when tested in the field. Measurement error caused by increased water discharge when it rains which can affect the buoy send a signal to JSN SR04T. The tested overall has been able to detect water levels, water level conditions and sent information, so that it is beneficial for the community to flood monitor the river flow.
Preliminary study of graphene like material fabrication from coconut shell using conventional furnace
Authors: Hidayat Rahmat , Jhora Fadhila Ulfa , Pangestuti Annisa Dewi
Published: May 2021

Graphene has risen into a very interesting material because of its extraordinary properties. A new breakthrough that challenges the researcher is how to synthesis graphene from biomass as natural waste and plentiful resources. Coconut shell attracts the most attention because it contains the highest carbon atom among others. In this work, we present the experiment using conventional furnace to overcome the expensive one. Unfortunately, the result is not as expected that Fe2O3is formed instead of amorphous carbon. We are trying to describe what caused this happen and recommendation to overcome this problem.
Magnetic morphology and mineralogy in urban soil of Bandung City, Indonesia
Authors: Kirana K H , Apriliawardani J , Ariza D , Fitriani D , Agustine E , Nugraha M G
Published: May 2021

High numbers of vehicles and its activity in Bandung City resulting in levels of pollution caused by their particulates on the top soils. Since the urban topsoil containing particulates are harmful, thus its mineralogy and morphology need to identified. The samples of topsoil were taken in several locations around Bandung City. Afterwards, the topsoil samples were extracted for mineralogy and morphology analysis using X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive X-ray (EDX) tests. The result of XRD measurement shows that the magnetic mineral dominated by magnetite. The magnetite is iron rich mineral that could be changed in morphology by the oxidation during environmental changing. Furthermore, the morphology of the magnetic mineral by SEM analysis exhibit the shapes of octahedron and spherules. The octahedron shape represents of paedogenic magnetic mineral carrier while the spherule indicate the presence of anthropogenic mineral. EDX analysis show the evidence of heavy metal elements on the magnetic mineral with spherule shape that caused by vehicles particulates.
Effect of zeolite catalyst concentration on bio-fuel characteristics of corncobs (Zea mays l.) produced by pyro-catalytic method
Authors: Jahiding M , Usman I , Isra  , Rizki R S , Mashuni
Published: May 2021

One alternative energy source that can be renewed is the conversion of biomass into bio-fuel. This study aims to produce bio-fuel from corn cobs and determine effect of catalyst concentration on physical and chemical properties. The pyro-catalytic process was carried out at 400? with 5%, 6% and 7% catalyst variations. Bio-fuel physical ssscharacterization tests include density, viscosity, and calorific value, while the analysis of hydrocarbon compound content uses GC-MS instrumentation. The results showed optimum biofuel volume was obtained at 7% catalyst variation that is 232 ml, while for physical and chemical characteristics the best results were obtained at 6% catalyst percentage with a density of 0.9636 gr/ml, viscosity 28.59 cP, and the calorific value is 10,350 kcal/kg. GC-MS analysis showed the content of Phenol, Furfural, acetic acid, Benzene, and Toluene compounds with a fuel percentage of 56.13% on a 6% catalyst. Based on the overall analysis that has been done shows that bio-fuel can be used as a substitute material for diesel or alternative energy substitute for conventional fuel.
Performance column adsorption of methylene blue using composite spent coffe ground-copper ferrites (SCG/CuFe2O4)
Authors: Erdawati  , Nanda Elsa Vera , Pratiwi Yussi
Published: May 2021

Composite Spent Coffe Ground-Copper Ferrites (SCG/CuFe2O4) synthesized by the method of precipitation. Copper nitrate, Ferri nitrate, SCG and sodium hydroxide mixed and stirred at 80°C for 5h, then calcined at 600°C for 2 h. The purpose of this research is to determine capacity adsorption SCG/CuFe2O4 to adsorb Methylen Blue (MB) with a column system. Approximately 0.5 g of SCG/CuFe2O4 were packed in to the column. Infusion tube filled with 250 mL MB 20 mg.L-1 was adjusted to pH 10, streamed into the column with flow rate 0.8 mL/min and 1.2 mL/min. The results obtained show that the faster the flow rate, the adsorption capacity (q0) and Thomas constant (kTh) MB increase. The highest q0 and kTh values were obtained at a flow rate of 0.8 L/min at 80.13 mg/g, 0.0028 L/mg. min.Desorption of CuFe2O4 with 0.1 M HCl solution show with 3 times elution, all MB bound to the adsorbent can be removed.
Time correction to eliminate structural ambiguity on velocity anomaly in the upper cibulakan formation of ITEUNG field, northern West Java basin
Authors: Tsany A , Indriani R F , Mariyanto M
Published: May 2021

Converting seismic data or structural maps from time to depth domain is very important in the stage of oil and gas exploration. Interpretation in time domain often produce inaccurate interpretation especially in zones under high velocity such as sub-salt or sub-carbonate. Under this zone, there are pull up velocity anomalies or pseudo-anticline. Otherwise in zones under low velocity such as water bottoms with sharp or fluctuating slopes (canyons), loose material overburden or rapid sedimentation, under detached electric normal faults and shale flaps, there are push down velocity anomaly or pseudo-syncline. The study area is in the Main and Massive Formation of ITEUNG Field, Northern West Java Basin where is proven to have petroleum potential. In the study area there are pull-up velocity anomaly or pseudo-anticline even though in reality they are just flat or even syncline due to the location in the zone under high velocity. This study aims to correct velocity anomaly by doing time correction and convert the time domain structure map into depth domain structure map with the time-depth curve method to eliminate structural ambiguity on velocity anomaly. The result shows that the map is obtained in the form of a depth domain structure map which is more accurate than the time domain structure map. Depth structure map make the interpretation more accurate because the structures in depth structure map is more similar to the original sovereignty after correlating with well data. In this present study shows that pull up velocity anomaly can be avoided so that interpretation can be done more accurately.
Nonlinear dynamics of modified peyrard-bishop DNA model in nosé-hoover thermostat
Authors: Sutantyo Trengginas E P , Ripai A , Abdullah Z , Hidayat W
Published: May 2021

In this study, we investigate the viscous effect by adding solvent potential into Hamiltonian Peyrard-Bishop DNA model. The dynamics of the modified Peyrard-Bishop DNA model is also considered in time-dependent thermal friction, namely Nose-Hoover Thermostat. Equation of motion formulate by using an analytical method, then solved using a numerical method. We show the pattern of phase space diagrams of the DNA dynamics in each variation of viscous and temperature, the movement of base pairs at a specific temperature, and the thermostat’s energy fluctuation that affects DNA dynamics.
Validity of physics student e-book based on the STEM approach to improve knowledge competence
Authors: Pratiwi Y , Yulia S R , Ramli R
Published: May 2021

Achieving the competency of students’ knowledge in learning Physics is still not optimal. This is due to the lack of available teaching materials that fit the needs of students, teaching materials available are only in the form of printed teaching materials and there is no approach in them, and learning has not been entirely centered on students who demonstrate lack of independence in learning. Utilization of technology is one of the efforts to facilitate learning in accordance with the needs of students by developing non-printed teaching materials in the form of a student ebook based on the STEM approach. The purpose of this study was to produce a student ebook based on a valid STEM approach. This type of research is research and development using the ADDIE model. The method used in this research is descriptive statistics. Student ebook validity was assessed by four experts using a validity questionnaire. The validity of the student ebook was analyzed using the formula Aiken’s V. The results of the validation showed that the aspect of the validity of the material substance was 0.89; visual display 0.92; and learning design 0.88. Based on the data analysis that has been done, student ebooks get an average value of 0.90 in the valid category. Thus, the student ebook based on the STEM approach can be implemented in physics learning to improve students’ knowledge competence.
Analysis of the competency standard of its graduates for the developing of physics e-book with tsunami theme
Authors: Firaina R , Fauzi A
Published: May 2021

Tsunami threat preparedness is important to reduce the risk of disaster. Tsunami disasters can be used as themes in physics learning to support disaster mitigation education integrated into teaching materials in the form of e-books. Tsunami disaster mitigation efforts are closely related to student competencies, so it is important to do preliminary analysis. The purpose of this study is to analyze the competency standard of its graduates as a qualification criteria for the students’ ability that is expected to be achieved. This study uses a quantitative descriptive method with the population being all high schools in Pesisir Selatan and the sample selected using a purposive sampling technique. The instrument used was a questionnaire that included several questions on aspects of attitude, knowledge, and skills. The results showed that the attitudes and skills competency were in less category with values of 75% and 72.44% respectively. The knowledge competency is in very less category with a value of 56.86%. These results indicate that the three competencies need to be further improved, especially the knowledge competency with the lowest percentage value.
Analysis of the competency standard of its graduates for the developing of physics e-book with earthquake theme
Authors: Khair N , Fauzi A
Published: May 2021

The earthquake is one of the disasters that occur in Indonesia. Knowledge about earthquake disasters can be integrated into physics through an e-book with the theme of earthquake disasters. One of the initial analyzes in e-book development is the analysis of graduate competency standards, which is one of the criteria to see student abilities in terms of attitudes, knowledge and skills competencies. The purpose of this study was to analyze the standards of graduates in the development of high school physics e-book on the theme of earth disasters. This type of research is a descriptive study with a population of all SMA in the city of Padang. The research instrument was in the form of a questionnaire sheet filled out by educators. The conclusions obtained from this study are the standard analysis of graduates that has been carried out with a competency value of student attitudes of 74.44%, knowledge competence of 56.37% and competency of skills of 67.95%. The results of this analysis can be used as a guide in developing an e-book on earthquake physics. The results of this analysis can serve as a guide in developing an e-book on physics on the theme of earthquake disasters.
Preliminary study of development of physics e-module using smartphone-assisted inquiry based learning models to support 21st century learning
Authors: Risma M , Yulkifli
Published: May 2021

The 21st century requires use of technology in learning. One technological device is smartphone. Smartphone-assisted learning materials are expected to increase the independence and competence of students. In addition, the learning model used must also be adapted to the curriculum and characteristics of the subjects. Facts at school show that learning hasn’t fully utilized technology. The learning material used is still in printed form and hasn’t been integrated with the learning model. This causes the student’s competency achievement to be less than optimal. Starting from the explanation, it takes learning materials in the form of e-modules using the Inquiry Based Learning model assisted by smartphones to facilitate students learning wherever and whenever. The purpose of this study was to analyze the development of the Physics e-module using a smartphone-assisted Inquiry Based Learning model for class X. The analysis conducted in this study was in the form of an analysis of needs, student characteristics, learning materials, and task analysis. The instrument used was a questionnaire sheet. The research method used was a quantitative descriptive study with the study sample were students of SMAN 3 Padang, SMA Pembangunan Laboratorium UNP and SMAN 12 Padang. The results of this study are descriptive data.
Conditions of learning physics and students’ understanding of the concept of motion during the covid-19 pandemic
Authors: Puspitasari R , Mufit F , Asrizal
Published: May 2021

An urgent learning problem in the Covid 19 pandemic is the unavailability of IT-based teaching materials that support online learning. In addition, in learning physics there are also fundamental problems, namely students’ low understanding of concepts. Misconceptions often occur in learning physics, especially in the concept of motion. Therefore it is necessary to know the problems and supporting factors of learning, especially in motion material, so that the right solution can be found. This study aims to determine students’ understanding of the concept of motion and to determine the conditions of learning in one of the high schools in Padang Pariaman Indonesia. This type of research is descriptive research, in the form of survey research. The instrument used was a concept test of motion taken from the FCI (Force Concept Inventory), this test is equipped with questions of belief and answers to the students’ reasons. Another instrument is a student and teacher questionnaire. The sample consisted of 31 superior class students and 3 physics teachers. The results showed that 36% of students had misconceptions, 34% of students did not understand the concept and only 30% of students understood the concept even though they had studied the topic being tested. Teacher learning is also lacking in identifying misconceptions (50%), less experimental activities (50%), discussions (58%) and other activities that actively involve students. Meanwhile students want learning that involves them actively even in the conditions of online learning during the current Covid19 era.
Preliminary research of networked-based inquiry model development to improve 21st-century competencies of students on physics learning in senior high school
Authors: Novitra Fuja , Festiyed  , Yohandri
Published: May 2021

This research is based on the important of developing a learning model that emphasizes the balance between the scientific approach and use of technology to develop students’ 21st-century competencies. One of learning models that support the goal is inquiry learning which is integrated ICT at infusing level. The model relies on digital technology to provide opportunities for students to investigate scientifically and authentically through information search, problem-solving, and digital collaboration and communication. This study aims to describe the results of needs and context analysis, review of relevant literature, and designing the theoretical framework and concepts for Networked-based Inquiry model development. This research was research and development using the Plomp model. This research has been done at preliminary research that consists of need and context analysis, literature review, developing conceptual theory. The results of needs and context analysis indicates that 21st-century competencies of students is still relatively low, and the integration of ICT in learning physics has enormous potential. The phase review literature revealed that inquiry learning model can improve students’ critical thinking, creative thinking, collaboration, and communication. Then, networked learning can accommodate the use of ICT in infusing level. These findings indicates that the development of Networked-Based Inquiry models can be a solution in accommodating students to develop 21st-century competencies which integrated with digital literacy.
Practicality of student worksheets science based on problem based learning models with the theme of the motion in life using integrated connected type 21st century learning
Authors: Marshel J , Ratnawulan  , Fauzi A
Published: May 2021

The problems in the field that are obtained are in accordance with the preliminary analysis that has been carried out before, especially in the field of science, namely learning that is not integrated, to overcome these previous researchers have developed teacher books and student books with thematic integrated learning in the 21st century, but there is a need for integrated learning Student Worksheet 21st century which supports the implementation of teacher books and student books to help students carry out practicum so that the Student Worksheet is used more optimally in facing the challenges of the 21st century. Student Worksheet used in schools is still not in accordance with the character of 21st-century education (4C) where Natural Sciences Student Worksheet has not been seen Critical thinking skills in problem-solving that can improve the ability of students to think at high levels (HOTS), and not be able to put forward creative ideas of students conceptually and practically. The learning process is still teacher-centred with the lecture method so that students are less active and do not have the opportunity to build knowledge independently. To use this Integrated Natural Sciences Student Worksheet, it is necessary to conduct development research. The purpose of developing research is to see the practicality of Integrated Science Student Worksheet assisted by the Problem Based Learning model with the theme of motion in life using the Connected type which is integrated 21st-century learning. The data collection instrument consists of the preliminary research stage instrument, the practicality stage instrument. The results showed that the Integrated Natural Sciences Student Worksheet showed a practical category, so it could be concluded that the Integrated Science Student Worksheet was assisted by the Problem Based Learning model with the theme of motion in life using the Connected type integrated 21st century learning in the practical category.
Validity and practicality of interactive multimedia based on cognitive conflict integrated new literacy on thermodynamic and mechanical waves material for class xi high school students
Authors: Arifin F A , Mufit F , Asrizal
Published: May 2021

The reality in the school shows that literacy students have not been implemented well and still have a low understanding of physics concepts as well as misconceptions of physics by students. The unavailability of teaching materials or multimedia that can specifically improve literacy and student’s understanding of concepts. The goal of this research is to develop interactive multimedia based on cognitive conflicts integrated with new literacies that are valid and practical. The research was conducted using a type of research of Plomp model development. The object of research is the interactive multimedia cognitive conflict. Product validity was tested using the instrument validity by the experts consisting of 5 lecturers of Physics, test the practicality of the product using the instrument practicality are one to one and small group by the students of class XI of SMAN 2 Padang. Data analysis techniques for validity and practicality of the product used descriptive statistical analysis. Interactive multimedia based on cognitive conflicts integrated new literacy on thermodynamics and wave mechanics materials for students of class XI high school is valid and practical. Interactive Multimedia can be used by teachers and students in learning activities.
Practicality of the interactive multimedia development integrated science with inquiry based learning model of simple machine themes on human muscular and skeleton system integrated 21st century learning
Authors: Nurhafifah  , Ratnawulan  , Fauzi Ahmad
Published: May 2021

The 21st century learning is learning that combines literacy skills, knowledge skills, skills and attitudes, as well as mastery of information and communication technology. 21st century learning requires students to be able to find solutions to problems based on their knowledge by using thinking skills. However, from the preliminary research, it was seen that students only studied science with low competence. To overcome this problem, it is necessary to update student learning resources. One example of using media to make it more meaningful is by using interactive multimedia. Because interactive multimedia is able to provide feedback for teachers and students who use it. teaching materials can be used independently by students. Interactive multimedia that has been developed based on the inquiry learning model can increase students ‘active participation in learning and can increase the competence of students’ attitudes, knowledge and skills. The quality of integrated science interactive multimedia development of inquiry learning models with the theme of simple planes on the 21st century skew integrated human muscle and system framework that has been developed can be used if it meets several appropriate criteria, namely aspects of validity, practicality, effectiveness. the validity of integrated science interactive multimedia is included in the valid criteria with an average value of 0.84. Practicality for one to one evaluations is 90.97% and practicality for small group students is 92.53% with very practical category.
Preliminary study on development of practicum module for algorithms and computer programming course
Authors: Anshari R , Sundari P D , Akmam A
Published: May 2021

Physics is part of Natural Sciences. Studying physics is inseparable from the existence of quantities. Quantities itself are anything that can be measured and expressed in numbers. These numbers then give birth to an empirical formula and a model that represents physical phenomena in nature. Physics students are expected to master, understand, and be able to apply physics knowledge to find solutions to physical problems. Lately, the use of computers has been integrated in almost all aspects of science, including physics. Based on these conditions, a computer-assisted calculation method known as a computational method has developed which is very precise and can involve large amounts of empirical data. On this basis, the Algorithm and Computer Programming Course was born, which focuses on providing programming skills to physics students so that they are able to use computers to calculate existing empirical physics formulas and mathematical models and for this purpose, critical and creative thinking skills are needed. The research carried out is a type of research and development (R&D) using the 4-D Model. This paper presents the results of research that has been carried out and shows the need for a needs analysis and the urgency of changing the use of a new programming language for students to better understand algorithms and coding. Data were collected by distributing questionnaires and analyzing literature.
Using Rasch model for the development and validation of energy literacy assessment instrument for prospective physics teachers
Authors: Yusup M
Published: May 2021

As the world facing energy crisis, energy literacy should be an important part in preparing prospective physics teachers. This research address the lack of currently available instrument to assess prospective physics teachers’ energy literacy. This paper aims to provide a validity argument of the ELA. Two pilot tests were carried out in three universities in Indonesia. In field-test I, the instrument was given to 112 students. The partial-credit Rasch model was applied to the data to examine items and test properties. The instrument was then revised and given to 123 students in field-test II. Through the processes of removing and/or modifying misfit items based on Rasch analyses, a set of 33 items that has a unidimensional construct of energy literacy was empirically established. Instrument validation results successfully provided a validity argument as they met inferences of scoring, generalization, explanation, and extrapolation. Further instructions on how to use results obtained from the instrument are also provided.
Analysis of student perceptions in the learning environment chemical laboratory
Authors: Allanas E
Published: May 2021

This study aims to analyze the perceptions of chemistry students towards the chemistry laboratory learning environment at Universitas Negeri Jakarta, by using instrument the Chemistry Laboratory Environment Inventory (CLEI). The sample used was 400 students of the Depart of Chemistry and Chemistry Education Universitas Negeri Jakarta. The research method used is a survey method using a questionaerie, laboratory observations and interviews with students. The survey results show the dimensions of student cohesiveness, open-endedness, integration, and students’ perception rule clarity is very good, only in the open-ended dimension and environment material resulting in a multitude of answers dominance never, rarely, and sometimes
Development of blended learning based on website on fluid mechanic material to improve students’ creative thinking skills
Authors: Serevina V , Meyputri C U
Published: May 2021

This research and development was based on the need for using of web-based media, with the aims of (1) developing web-based media with fluid-mechanics material, (2) as a support system of a blended learning to improve creative thinking skills that are currently urgent and needed by students, (3) produce web-based learning media that can provide facilities for the efficiency and effectiveness in teaching and learning process. The method in this research development used the ADDIE (Analyze, Design, Development, Implementation, and Evaluation) model. The lecture material in this study is fluid mechanics on the website: vinnarrai.com and its effectiveness was observed from the posttest and pretest, with the research object namely 70 physics education students, which conducted in Semester 111th 2019 at State University of Jakarta. The validation results from the media experts stated 85% of the web developed was very good for use and the validation from the material experts stated that 90% of the material presented was very feasible. The validity test on the instrument with fluid-mechanics material shows the value of the t-test results (6.80)> t-table (2.16) with 11 valid questions and 4 drop questions. Then the reliability test for the whole question are declared reliable with score r-count 0.73 > r-table 0.05, so the creative thinking skills instrument for this fluid mechanics material was reliable. The results of this study to improve creative thinking skills of students with 0.56 N-Gain ratings in the medium category. The conclusion of this study showed that the blended learning based on website has been used in the learning process was feasible to use and effective enough to improve students’ creative thinking skills.
Development device learning online use model inquiry learning on theory the balance of tough things
Authors: Serevina V , Lestari M A
Published: May 2021

Covid-19 pandemic has changed the world of education where the learning process is done remotely by using an online learning system (online) which is done at home. The need for a device learning is designed to be able to support the distance learning process and achieve 21st century competence, which is directly involved in the learning process using internet facilities. This study aims to develop online learning tools using Inquiry Learning model for physics subjects on equilibrium of rigid bodies. The syntax of the Inquiry Learning model 1) orientation to the problem, 2) making a hypothesis, 3) collecting data, 4) processing the results of the data, and 5) formulating conclusions. The researcher used research and development method (Research & Development), using the ADDIE models (Analysis, Design, Development, Implementation,Evaluation). The validation results of the three experts and the overall average teacher showed a percentage of 81.89%, it can be categorized in a very good category. This online learning tool can be declared very good or feasible to use in physics lessons on rigid equilibrium material. So, the development of online learning tools using inquiry learning model on rigid equilibrium material is effective and suitable for the physics learning process of class XI senior high school.
Development of discovery learning-based on online learning tools on momentum and impulse
Authors: Serevina V , Luthfi K
Published: May 2021

Covid-19 pandemic affects all aspects of lives including, education. In line with large-scale social restriction policy, Education and Culture Ministry issued a policy to close schools and replace the face-to-face learning activity with online learning or known as distant learning. This research is aimed at developing discovery learning-based online learning tools on momentum and impulse. The learning tools that were developed are Lesson Plan, Student Worksheet, and Handout. Discovery learning model could improve students’ active learning as they find and investigate on their own. As the result, the comprehension they get will last long in their memory. This research uses ADDIE development model consisting of five stages, namely Analysis, Design, Development, Implementation and Evaluation. The Data was analysed using descriptive analysis technique. The learning tools was tested at SMK Negeri 53 state vocational high school Jakarta by 35 students at tenth grade of Motor Cycle Business Technique (TBSM) class as well as through teacher’s response questionnnaire. The research resulted in online lerning media that is approporate for distant physics learning on momentum and impulse with subject expert’s validation at 85.38%, learning expert’s validation at 86.25% and media expert’s validation at 88.50%. The online learning tools is categorized as ‘good’ with validation result percentage at 86.71%.
Development of online learning devices based on PDEODE (predict - discuss I - explain I - observe - discuss II - explain II) on the material doppler effect in the covid-19 pandemic era
Authors: Serevina Vina , Arianti Silfia
Published: May 2021

The impact of the Covid-19 Pandemic changed the world of education, especially in the implementation of Teaching and Learning Activities. In the learning process, for example the teacher no longer has to face to face with students because it can be done online. This research aims to develop an online learning device based on PDEODE (Predict - Discuss I -Explain I - Observe - Discuss II - Explain II). The type of research used is Research and Development (R&D) using the 4-D model (Define, Design, Development, Desiminate). However, this research only reached the develop stage. This online learning device was validated by 6 expert validators, which included 2 material expert validators, 2 media expert validators and 2 learning expert validators. This PDEODE-based online learning devices has already been tested on its product design for teachers and grade X students at SMKN 53 Jakarta. The result shows that the PDEODE based online learning devices is “very good” because it has been through the validation test stage and trial phase with a percentage of achievement as much as 63.77% according to material experts, 89.94% according to media experts and 85% according to learning experts. The results of trials by teachers and participants students show the percentage of teacher responses as much as 94% and overall can be a percentage of 83.18%. Based on the analysis of data that has been collected can be concluded that PDEODE-based online learning devices on the Doppler Effect material are very good/feasible to be developed and used in this Covid-19 Pandemic Era.
Effects of mechanical wave learning material by integrating CTL strategy on environmental literacy of grade XI students
Authors: Asrizal  , Desnita  , Darvina Y , Usman E A , As Sidiq S A
Published: May 2021

Learning in the 21st century should be connected to real world contexts. CTL strategy is one way to develop student skills. This is because learning process with a CTL strategy presents learning material that is related to the environment around students, in this way it can foster and improve students environmental literacy. In learning process, CTL strategy and environmental literacy can be integrated into learning material. However, the conditions found in the application of CTL strategy and environmental literacy in schools were still lacking. The solution to this problem is to use mechanical wave learning material integrated with CTL strategy for the environmental literacy of grade XI students. This research was a quasi-experimental research with a before and after design for related sample groups. The research instrument consisted of a knowledge aspect learning outcome test and student environmental literacy assessment sheets. The research data were analyzed using descriptive statistics and the two means comparison test for related groups. The result of the data analysis is the use of mechanical wave learning material integrated with CTL strategy has a positive effect on the knowledge aspect and environmental literacy of grade XI students.
Analysis of student problem solving skills on physics concepts in SMP/MTs through blended learning early teaching during the covid-19 pandemic
Authors: Hasan M , Mursalin  , Odja A H
Published: May 2021

This study aims to determine students’ problem solving skills in physics concepts at the SMP/MTs level by teaching blended learning. The research method used was a mixed method with a sequential explanatory strategy. The data were obtained through the provision of problem-solving tests, the data was strengthened by interviews with student representatives who obtained high, medium and low scores. The sample in this study were 20 students of class VIII of the MTs in Gorontalo. The results of the analysis show that the problem solving ability of physics concepts on the topic of light is in the low category. The average percentage of students’ problem solving abilities was 52, 58%. For each problem solving indicator, the percentage is as follows: 72, 50% for the problem focus indicator; 14.66% for physical description indicators; 64.50% for indicators planning completion; 54.75% for indicators of implementing the plan; and for indicators evaluating the completion reached 56.50%. From the results of the interview, there were various obstacles experienced by students in conducting online teaching. Online teaching is carried out using blended learning, namely through virtual face-to-face and non-virtual face-to-face. The low problem solving skills of students for the concept of physics on the topic of light needs to be improved in the application of blended learning, especially related to the obstacles faced by students in implementing blended learning during the Covid-19 pandemic.
Guide inquiry science e-module development for improving junior high school students’ scientific literacy
Authors: Maison  , Wahyuni Ika
Published: May 2021

The first-grade students of SMP Negeri 9 in Jambi City experience difficulties in understanding science concepts, especially temperature and heat. Their ability to process numbers has also not been optimally developed. There is a need for teaching materials in the form of a learning module that is easily accessible for students to learn independently and better. This study aims to produce a product in the way of guided inquiry-based electronic learning modules to contain instructional materials and learning media that are easy to use and contextual, with a clear and understandable language and delivery. The development model used is the ADDIE model. The study result has been analyzed using the descriptive qualitative method. The development process has been carried out a prototype electronic learning modules with a science literacy load on the learning material presented. The individual test results and small group trials show that the electronic learning module is easy to use and easy to understand with an attractive design. Furthermore, the electronic learning module has a positive impact on improving learning and reading motivation and the ability to process numbers. It is an electronic module that potentially enhances students’ science literacy.
Evaluation of error- and correlation-based loss functions for multitask learning dimensional speech emotion recognition
Authors: Atmaja B T , Akagi M
Published: May 2021

The choice of a loss function is a critical part in machine learning. This paper evaluates two different loss functions commonly used in regression-task dimensional speech emotion recognition — error-based and correlation-based loss functions. We found that using correlation-based loss function with concordance correlation coefficient (CCC) loss resulted in better performance than error-based loss functions with mean squared error (MSE) and mean absolute error (MAE). The evaluations were measured in averaged CCC among three emotional attributes. The results are consistent with two input feature sets and two datasets. The scatter plots of test prediction by those two loss functions also confirmed the results measured by CCC scores.
The effect of reverberation time on sound masking method to improve speech privacy in open-plan offices
Authors: Valentina L L , Arifianto D , Azmi F U , Fajar B , Nadiroh A
Published: May 2021

Lack of speech privacy is a significant problem in open-plan offices. Sound masking, which essentially covers the target speech with the competing speech simultaneously (masker), can increase speech privacy. However, a conversation takes place in a reverberant room at which will reduce speech intelligibility. This study observed the effectiveness of reverberation time on the sound masking to the target. In this early study, three conditions of stimuli were used, namely clean, 0.3 s and 0.6 s reverberation time added to both target and masker, respectively. The STI and subjective measure were used with twenty-five volunteers. As expected, the results suggest that the longer the reverberation time, the lower the effectiveness of the masker strength. The STI agrees with the subjective measure.
Sound absorption behavior of combined woven fabrics and nonwoven fabrics
Authors: Gunawan  , Prasetyo I , Adhika D R , Brahmana F , Yuliarto B
Published: May 2021

It has been known that woven fabrics and nonwoven fabrics exhibit absorption capability. Despite this, both have different characteristics in absorption. The absorption of woven fabrics occurs due to resonance system which has a narrow absorption bandwidth but it is tunable for low frequency absorption. Meanwhile, that of nonwoven fabrics is present due to mainly visco-thermal effect of porous media so that the wide absorption bandwidth can be obtained at mid-high frequency. This works is focused to investigate the possibility to combine features of each fabrics in order to have a better performance of textile-based absorber. Experimental works on some configurations of combined woven fabrics and non-woven fabrics are conducted. It is found that some absorption enhancements are observed compared to original performance of each material. Hence, both materials are complementary to produce a better performance in overall. However, such a combination should be realized with a great care as absorption performance at mid-high frequency can be deteriorated or lead to poor results.
Comparison of sound level meter calibration for frequency weighting parameter using coupler method
Authors: Dwisetyo B , Rusjadi D , Palupi M R , Putri C C , Utomo F B , Prasasti N R , Hermawanto D
Published: May 2021

A large number of industrial needs to the sound level meter (SLM) calibration has encouraged the laboratory to develop a qualified calibration system. As one of the SLM calibration methods required by the standard, the coupler method is considered as the most convenient to be implemented, especially for the secondary laboratory. Therefore, the aim of this work is to compare the SLM calibration for the frequency weighting parameter by this method using the instrument standards that comprise of a multifunction acoustic calibrator and a working standard of pressure microphone (WS2-P Microphone). Moreover, the result of frequency weighting calibration using these standards, therefore, is compared to the reference value required by IEC 61672-1. From the result, the deviation values of these standards are obtained relative to the reference. At the low to middle frequencies, the deviation values are slight relatively, while at the higher frequency, it tends to bigger. In addition, these methods also support the development system of noise dosimeter and sound level meter calibration that still under research through the scheme of Incentive Research Program for the National Innovation System in 2020.
Geometrically nonlinear free vibration of Euler-Bernoulli shallow arch
Authors: Outassafte O , Adri A , Rifai S , Benamar R
Published: May 2021

The purpose of this work is to investigate the geometrical non-linearity in free vibrations of the Euler-Bernoulli shallow arch with clamped ends. The nonlinear governing equilibrium equation of the shallow arch is obtained after the Euler Bernoulli theory and Won Karman geometrical nonlinearity assumptions. The initial curvature of the arch is not due to the axial displacement of the beam but is due to the geometric of the beam itself. Taking into account a harmonic motion, the kinetic and total strain energy are discretized into a series of finite functions, which are a combination of the linear modes calculated before and the coefficients of contribution. The discretized expressions are derived by applying a Hamilton principle energy and spectral analysis. A cubic nonlinear algebraic system is obtained and solved numerically using an approximation method (the so-called second formulation) is applied to resolve various nonlinear vibration problems. To illustrate the effect of the curvature on the fundamental nonlinear mode and nonlinear frequency, the corresponding backbone curves, nonlinear amplitude vibration, and curvature of the arch are presented for the first modes shapes.
Conceptual model of soundscape perception based on working behaviour in open-plan offices
Authors: Indrani H C , Ekasiwi S N N , Arifianto D
Published: May 2021

The open-plan office is one of the most popular and preferred workspace arrangement options for employers today. The results of research in western countries show that listeners’ perceptions of the soundscape in open-plan offices are negative, due to reduced visual and acoustic privacy and uncontrolled sound levels. This can cause a significant decrease in work comfort and productivity. Several researchers have provided acoustic design solutions by performing adequate speech control through several solutions such as creating spacing between workstations, the use of acoustic dampening materials, insulation between workstations, and application of a noise masking system. The phenomenon of adopting an open-plan office has also hit offices in big cities in the world, including in Indonesia. The purpose of this paper is to further examine listeners’ perceptions of the soundscape in the case of open-plan offices in the local environment because the results are indicated to be different from similar cases in western countries, given the peculiarities of employee work behaviour which are influenced by individual experiences and social effects in the local environment are also different. For this reason, a comprehensive literature review method is needed that aims to investigate the relationship between soundscape perceptions and working behaviour in open-plan offices in the local environment and then to create an integrated conceptual model so that further researchers can evaluate the research related to these problems.