bluuebunny/crossref_metadata_2025_split huggingface dataset:
Interactive recitation methods as a solution to the students’ deepening physics material during the Covid-19 pandemic
Authors: Sundari P D , Dewi W S 
Published: May 2021

AbstractThe spread of Covid-19 in Indonesia has an impact on the implementation of learning at various levels of education, including higher education. During the Covid-19 pandemic, the implementation of learning is conducted by online learning. Students should be able to learn independently to understand learning material. This research purposes to describe the interactive recitation method as a solution for the students’ deepening of learning material during the Covid-19 pandemic. This research was conducted in odd semester 2019/2020 in the general physics course at Universitas Negeri Padang involving 141 students. Data were collected through survey, observation, interviews, and document analysis. The results showed that students’ understanding of the concept was still low for each lecture material. This can be seen from the mistakes of students’ answers to the questions given during lectures. Students have difficulty to memorize the physics concepts for a long term memory. So, an interactive recitation method needs to be developed as an solution to deepen lecture material. The interactive recitation method is loaded with various conceptual questions for each lecture material including feedback, and its makes easier for students to learn physics concepts independently during the Covid-19 pandemic.
Development of online learning device based on demonstration models on heat transfer materials
Authors: Serevina V , Priane W T 
Published: May 2021

Abstract
Whether we realize it or not, the faster and rapid development of technology has an impact on the faster and faster progress in the world of education. During the current covid-19 pandemic, much needed online learning tools, the concept of home-schooling has never been mainstream in the national education discourse. Because the teaching system has been changed through online learning, there is a need for the development of learning tools for teachers to be able to continue delivering material to their students. This study aims to develop online learning tools based on demonstration models on effective heat transfer material during the covid-19 pandemic. The development of this research uses the ADDIE model with stages of development: 1. Analysis, 2. Design, 3. Develop, 4. Implement, 5. Evaluate. Learning tools are made online to make it easier for teachers and students to carry out teaching and learning activities during online learning. Validation was carried out by 3 experts, namely media experts, material experts, learning experts and tested on students. The results of the analysis of the validation of material experts obtained an average percentage of 86.80 % in the very high category, the results of the analysis of learning experts obtained an average percentage of 88,70 % with a very high category, the results of the analysis of the media expert obtained a percentage of 86,70 % with a very high. The subject was tried in class XI high school. Data collection instruments using a questionnaire through the Google form. From the results of the development of online learning tools based on online demonstrations on heat transfer material obtained learning tools (Free Learning Implementation Plan, Worksheet and online media) have been tested for eligibility by experts and field trials with good criteria and are suitable for use.
Development of instruments for measuring contextual-based video quality of fluid for physics at senior high school grade XI
Authors: Desnita  , Festiyed  , Novisya Dira , Marsya Putri Bullquis , Hamida Sadra 
Published: May 2021

Abstract
Contextual learning videos present various events related to the topic of the lesson. One of the benefits of contextual-based learning videos is to improve critical thinking, creative thinking, collaboration, and communication skills (4C). The requirement for a video to meet the standards as a learning medium is valid, practical, and effective. An instrument is needed to measure the three the quality standard of the learning media. The instrument must meet valid and reliable criteria. An instrument has been developed to measure the validity, practicality, and effectiveness of CTL-based fluid learning videos for high school physics lessons level XI. The instruments consist of (1) validity according to expert physics learning and physicists, (2) practicality according to senior teachers and high school students, and (3) effectiveness for measuring critical thinking skills, creative thinking, collaboration, oral communication, and written communication; over all 9 instrument units. Expert validation tests have been carried out and all instruments are considered valid. Experts, teachers, and students have tested the use of instruments, the test results show that all the instruments are reliable. Based on the results obtained, it can be concluded that the instrument made meets the standards as a measuring tool for the quality of contextual-based fluid learning media.
Validity and practicality book chapter’s model on thermodynamics and mechanical waves material integrated new literacy and disaster literacy of students for grade XI high school
Authors: Anori S R , Mufit F , Asrizal  
Published: May 2021

Abstract
In the 4.0 revolution era, 21st century skills are needed that will build superior human resources who can compete in their lives. One of the 21st century skills is literacy. However, the real conditions that occur indicate the lack of new literacy and disaster literacy abilities possessed by students. The solution made to overcome these problems is to develop a book chapter’s model integrated new literacy and disaster literacy. The type of research carried out is Research and Development (R&D) with Sugiyono’s development. The instrument used was an instrument at the potential and problem stage consisting of observation sheets of physics learning implementation, document analysis sheets, and analysis sheets of students’ initial knowledge tests in physics learning, then the validity test instruments and practicality test instruments. The results of data analysis from the research are book chapter’s model integrated with new literacy and disaster literacy with a validation value of 79.78 with good category and a practical value of 84.77 with excellent categories. So, it can be concluded that the book chapter’s model on thermodynamic and mechanical waves material integrated new literacy and disaster literacy is valid and practical for students of grade XI high school.
Problems of students in following the online learning process in the covid-19 pandemic
Authors: Akmam A , Hidayat R , Mufit F , Jalinus N , Amran A 
Published: May 2021

Abstract
The Covid-19 pandemic requires people to work remotely from home or Work from Home (WFH), including lecture activities. The goal of WFH is to break the chain of spread of the corona virus. Transfer of lecture activities from campus to home as an effort to maintain social distancing. Like it or not, students must learn more independently. Many students respond well to online learning when it is implemented. However, students actually experience difficulties in learning after the online lecture process is running which has an impact on decreasing the quality of their learning. This survey research aims to determine the obstacles faced by physics students in participating in the online learning process during the Covid-19 pandemic. The research sample of 331 respondents who have participated in the online learning process activities in the Covid-19 pandemic were taken randomly. The research instrument was a questionnaire sheet distributed on google form for 20 days. The results showed that students tended to choose the learning process on campus compared to studying online. The factor influencing online learning are the internet network, the readiness of students to receive and send information and the accessing the Learning Management System (LMS). The influence of these factors is found by students when they take courses in Disaster Management, Fundamental Physics, Mathematical Physics, Computational Physics, Algorithms and Computer Programming.
Need analysis for the development of mobile virtual laboratory in junior high school for electricity and magnetics topics
Authors: Oktavia Rani , Putri Rahmah Evita , Arif Khairil 
Published: May 2021

Abstract
Science is compulsory subject at the junior high school level. Mastery of science material by students is highly prioritized so that students have the skills to solve daily problems related to science. One of the ways to develop this skill is by doing practical work. Electricity and magnetism are science subject matter that students should follow in the form of practical work because this material has a lot to do with problems in everyday life. However, the limited duration of learning time at school makes some science subject matter that should be studied in the form of practical work cannot be implemented. This happens because of the large amount of material that must be taught in accordance with the demands of the curriculum. Other factors that lead to not carrying out practical work are incomplete science laboratory facilities, inadequate teacher experience, and conditions that do not allow learning to occur directly in schools. The Mobile Virtual Laboratory is a virtual laboratory that can be accessed by students via an Android-based mobile phone so that students can learn practical work anywhere and anytime. This article describes an analysis of the needs of the Mobile Virtual Laboratory in teaching science in junior high schools for electricity and magnetism.
Development of inquiry based learning model - based student worksheets through the 21st century science process skills approach to grade XI physics learning
Authors: Widestra R A , Yulkifli  
Published: May 2021

Abstract
Students in the learning process are still not optimal and active in learning activities. One of the contributing factors is that the available Student Worksheet is still in print and has not contained model steps and learning approaches that lead to student activities. The purpose of this research is to establish a learning model based on interactive student worksheet inquiry. The model has a comprehensive scientific literacy and scientific process skills method to conduct eleventh grade physics learning with effective and practical standards.. This type of research is development research using ADDIE model consisting of analysis stage, design, development, implementation, evaluation. Research instruments include preliminary study questionnaires, validity questionnaires and practical questionnaires.. Data analysis techniques for validity use Aiken’s V formula, for practicality using descriptive percentages and effectiveness using N-gain score The results of the analysis stage show the need for the development of interactive student worksheet Development results show student worksheet is on a valid criteria with a value of 0.87; Practicality scores are very high based on the response of students and teachers with average scores of 84.76% and 96.45% respectively. t. Thus, it can be concluded that the student worksheet inquiry based learning model with a process skills approach to grade XI high school physics learning meets valid, practical criteria.
Development of virtual reality-based learning media on electromagnetic wave radiation material
Authors: Shepa M J , Serevina V , Astra I M 
Published: May 2021

Abstract
The aim of this study to develop virtual reality-based learning media on electromagnetic wave radiation material. The research method used the research and development (R & D) with the ADDIE models (Analysis, Design, Development, Implement, Evaluation). Data collection techniques used through observation and questionnaires. The development of virtual reality - based learning media was done in School of St. Yoseph Bekasi. This development research was conducted on science subject teachers. This virtual reality-based learning media has been validated by experts, that is content experts and media experts by providing validation instruments. Virtual reality-based learning media can be used to simulate a learning process that does not allow direct involvement because it will be dangerous for learning participants in this covid19 pandemic era. So, the virtual reality-based learning media just tried to the teachers and experts. The conclusion of this research was the development of virtual reality-based learning media on electromagnetic wave radiation material can be used as a learning resource for students.
Validation analysis of basic electronics textbooks 2 integrating creative thinking in the Physics Department, Universitas Negeri Padang
Authors: Hufri  
Published: May 2021

Abstract
This study aims to determine the validity of basic electronics book 2 by integrating creative thinking skills. This type of research is research and development (R&D) using the ADDIE design model, the research steps include : analysis, design, development, implementation, evaluation. The data collection instrument used is a validation sheet that has been previously validated by the validator. Based on the results of data analysis of the validation of basic electronics book 2 by integrating creative thinking skills, an average value of 86.6% was obtained with very valid criteria.
Infrasonic observation of microbarom signals in the middle latitude: An investigation of summer and winter season on the upper atmosphere
Authors: Batubara M , Yamamoto M-Y 
Published: May 2021

Abstract
We report the result of infrasound observation applied to microbaroms between peak winter and summer season of 2018, obtained from ambient noise. For our study several infrasound sensor over Shikoku island was used, which had been installed since 2015. Observation of our microbaroms shows regular pressure variations of a few milliPascals at around 0.2 Hz produced by the incoming of infrasound arrived from the ocean fields. As the result, their amplitudes show prominent greatly in winter time expect to depend on the appearance of the atmospheric sound ducts between the surface and the level at certain altitudes. These ducts depend on the wind structure and vertical temperature of the atmosphere. For our station close to the ocean, sound ducting from the oscillation wave of the ocean surface, requires strong contribution westerly winds at certain upper reflection point. With a global reanalysis horizontal wind assimilation, the seasonal wind structure at our geographical study, near 33° N, is shown to distinguish and to account for the observed profiles of microbaroms. Finally, we suggest that use of our network of infrasound sensors would provide a global complementary result to monitor the upper atmosphere conditions in the middle latitude regions.
A comparative study of sound sources separation by independent component analysis and binaural model
Authors: Atmaja B T , Arifianto D 
Published: May 2021

Abstract
Humans’ auditory system can separate mixed sounds based on their sources easily. However, mimicking this ability by computer algorithm is not an easy task. Some approaches have been developed, particularly based on the statistical approach and binaural modeling. From statistical methods, independent component analysis (ICA) grows fast to mimics sound separation and localization by human auditory processing. On the other side, mathematical modeling to model binaural hearing has been built block by block. This paper is a comparative study of both approaches, a statistical method represented by FastICA and binaural modeling represented by the frequency domain binaural model. The task is to mimic how to binaural processing works to separate sound sources. The result of the comparison was given by the perceptual evaluation of speech quality (PESQ) and Itakura-Saito (IS) distortion measurement. PESQ scores ICA method obtains better performance than the binaural model while, in contrast, IS scores the binaural model better than ICA.
Sound absorption behavior of woven fabrics as micro perforated panel absorber
Authors: Gunawan  , Prasetiyo I , Adhika D R , Brahmana F , Yuliarto B 
Published: May 2021

Abstract
Woven Fabrics are potentially developed as a sound absorber system because of the presence of micro perforation on their surface. By introducing air cavity backing the woven fabrics up, such system can undergo Helmholtz resonator mechanism as found in micro-perforated panel (MPP) absorber system. The micro perforations in a woven fabric are formed by yarn in x (weft) and y (warp) direction. The perforations can create a viscos-inertial effect when interact with sound fields that is useful as a basis for sound absorption mechanism. In this study, the works are focused on investigating the relationship of micro hole of woven fabric material to sound absorption characteristics. For this, micro holes are developed by controlling weft density. Meanwhile, the sound absorption coefficients are evaluated by measurement using impedance tube. From this study, it can be concluded that the sound absorption coefficients of woven fabric are affected by weft density variation by which the perforation parameter can be varied. Moreover, the performance of woven fabrics are promising as indicated by absorption coefficients that is ranging from 0.71-1.00 with absorption bandwidth of 3 kHz-5 kHz.
Performance evaluation of smartphone-based vibration meter application software
Authors: Prasasti N R , Putri C C , Hermawanto D , Dwisetyo B , Utomo F B , Palupi M R , Rusjadi D 
Published: May 2021

Abstract
Modern smartphones have been equipped with MEMS sensors allowing them to be used for advanced purposes. A MEMS accelerometer is embedded in the smartphone to sense motion and vibration. Recently, many smartphone-based vibration-meter applications software employed the embedded accelerometer and used them for vibration monitoring and field measurement. However, the accuracy of this kind of vibration meter has not known yet. In this paper, we discuss about the evaluation of smartphone-based vibration meter using the standard method for vibration meter calibration described in the ISO 16063-21. A vibration measurement by the smartphone-based vibration meter is compared to the reading of the reference accelerometer type B&K 8305. The evaluation was conducted in a frequency range of 10 Hz to 50 Hz with the amplitude of 0.1 G to 1 G. This study showed that the accuracy of the smartphone-based vibration meter is decreased in the higher frequency range.
An acoustic exploration of event construals in Bengali language
Authors: Chowdhury S , Gayen P K , Sarkar U , Banerjee A , Sanyal S , Karmakar S , Ghosh D 
Published: May 2021

Abstract
The world is full of events, and events are construed. One of the major research questions, therefore, seeks to understand the way events are construed through language. Event construals involve the syntacto-semantic properties of certain linguistic categories such as Verb, Tense, Aspect, Modality, etc. Serial Verb Constructions (SVC) and Complex Predicate Constructions (CPC) are no exception to this very fact. In this work, we look forward to compare both linear and non linear acoustical features generated from SVC and CPC events found in sentences of Bengali language. For this, we recorded 60 common utterances of Bengali language containing SVC and CPC events individually (around 36 of them belong to SV category while the rest belong to CP category), from 1 male and 1 female native Bengali speakers. The serial verb construction in these utterances may contain two (2) serial verbs in either simultaneous or sequential order, while few sentences are such that they can be interpreted both as SV or CP events. The main objective is to look for robust acoustic features which lead to perceptual categorization of events as SV or CP with a particular linguistic background. Various linear features like MFCC (Mel frequency Cepstral Coefficients), spectral skewness/energy, pause duration, pitch profile and nonlinear features like Fractal Dimension (FD) have been employed for the classification purpose. This work is a pilot study of an ongoing project which looks to explore the concept integrating capacity of human brain in terms of Syntactic Compositionality or Semantic Combinatorics in a complex sentence. This preliminary acoustic study reveals interesting new results in terms of perceptual linguistic representation of the event construals.
Study of the phase transition of a medium using reverberated signals
Authors: Farhat Y , Bustillo J , Achdjian H , Sabra M N , Zaouk D , Fortineau J 
Published: May 2021

Abstract
Non-destructive testing (NDT) methods nowadays are essential in materials and structures control due to their capability to not affect the integrity of material. These methods are particularly efficient for the monitoring of resin or composites formation. In particular, ultrasonic technics can be used to evaluate mechanical properties of materials by measuring acoustic waves characteristics. In general classical characterization techniques, based on linear measurements, give local information’s of medium. Reverberation methods, classically used in room acoustics, allow global characterization. This approach is not so common in NDT or structure monitoring. The reverberation signals which contain global information about propagation media properties, are highly dependent on the boundary conditions. Sabine’s formula gives the relationship between reverberation time RT and wall attenuation coefficient can be adapted in many acoustic applications. Previous studies established a relation between RT and solid interfaces absorption. In the case of a sol-gel material, the reverberation time measured in a metallic block can be linked to the material properties such as density or viscosity. The RT will vary during the phase transition of our material from liquid to solid state. Hence, our motivation is to derive the equation of the acoustic intensity for solid interface absorption considering the shear and the longitudinal waves. Furthermore, to estimate the reverberation time from the determined acoustic intensity (simulation part) and to compare the results with the experimental part. For this reason, experiments were performed to validate the simulation part. Measurements are preformed in an aluminium mold using five piezoelectric (PZT) patches, one being used as emitter and the others as receivers has been studied and it’s evolution is shown to lead to a good estimation of the phase transition time.
A silencer design and analysis of the effect of silencer perforation towards resonant frequency and insertion loss in a duct
Authors: Suyatno  , Panggabean N B 
Published: May 2021

Abstract
A silencer model was designed for application to HVAC systems, specifically for noise control in ducts. The goal was to see how the perforation of the silencer affected the resonant frequency and Insertion Loss (IL), as well as analyse physical phenomena that occurred in system. The materials used were 1/2-inch PVC pipes 5 cm in length and acrylic with a thickness of 2 mm used as the silencer frame. The varied parameters were the amount of PVC pipes (percentage of silencer perforation) from 0 holes (no perforation) to 10 holes. It is concluded that perforation affects the resonant frequency through changes in acoustic mass and affects the IL through acoustic resistance. It is inconclusive whether the resonant frequencies generated affected IL. It is assumed that negative valued IL observed at lower frequencies occurred due to resonance between the sound and duct (structure-borne sound) which increased sound pressure level, or that these may be the actual resonant frequencies generated. Further research is needed to study the generation of resonant frequencies and structure-borne sound in the system, study airflow and thermal performance of a HVAC system when the silencer is applied, the transmission loss (TL) of the silencer and optimisation of the design to improve low-frequency sound attenuation.