bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of initiator concentrations on corrosion inhibition activity of polymeric derivatives of 2-vinylpyridin
Authors: Ilim I , Bahri S , Marjunus R , Simanjuntak W 
Published: January 2021

AbstractThis study aims to investigate the effect of initiator concentrations of polymeric derivatives of 2-vinylpyridine, P(2VP) as corrosion inhibitors of mild steel in CO2-satured brine solution. Polymerization of the monomer was conducted using hydrogen peroxide initiator with four different concentrations of 0.25; 0.33; 0.50; and 0.80 mole, to produce four oligomers referred to as P(2VP)A, P(2VP)B, P(2VP)C, and P(2VP)D, respectively. A series of corrosion experiments was conducted to determine the corrosion rate of the mild steel using weight loss and linear polarization resistance (LPR) methods. The effect of inhibitor concentration, and temperature, on the corrosion rate was also investigated. The oligomers synthesized were found to have different physical appearance. Two oligomers, the P(2VP)A and P(2VP)B, were found as yellow viscous liquids, with O(2VP)B is more viscous than P(2VP)A, while the other two oligomers, P(2VP)C and P(2VP)D exist as yellow solids. The experimental results reveal that the use of monomer led to higher corrosion rate compared to that of blank experiment, but reduced corrosion rate was achieved with the use of the oligomers. P(2VP)A as an oligomer synthesized with the lowest concentration of H2O2initiator inhibited the corrosion more effective than the higher concentrations. It was also found that the higher the concentration of the oligomer, the better the protection. For temperature, the opposite is true, indicating that the oligomer was physically adsorbed onto the surface of mild steel.
Identification and antibacterial activity of flavonoid compounds from wood branches of the pudau plant (Artocarpus kemando Miq.)
Authors: Suhartati T , Wulandari Z , Wulandari M , Yandri  , Hadi S 
Published: January 2021

Abstract
In this research, isolation, identification, and antibacterial assay of flavonoid compounds have been carried out. These compounds were obtained from the wood branches of the pudau endemic plant from Karang Anyar village, Penengahan, South Lampung Regency, Lampung Province. Flavonoid compound extraction was carried out by maceration method using methanol, while fractionation and purification were conducted using chromatography technique. The purity of the compounds was determined by the melting point test and thin layer chromatography, the identification of compounds was assigned by UV-Vis and IR spectroscopy. The results of the isolation obtained two compounds, artocarpin (1) and cycloartocarpin (2). Compound (1), 92 mg, in the form of a yellow needle crystal with a melting point of 184.9 -187.5 °C; compound (2), 20 mg, in the form of yellowish white needle crystals with melting point 280 - 283 °C. In the antibacterial assay against Bacillus subtilis and Escherichia coli, compounds (1) showed very strong antibacterial activity at a concentration of 0.4 mg/disk and 0.5 mg/disk, respectively, whereas compound (2) had strong antibacterial activity against B. subtilis and E. coli at the same concentration of 0.5 mg/disk.
Production, purification and characterization of the α-amylase from local bacteria isolate Bacillus subtilis ITBCCB148
Authors: Yandri  , Witazora Y , Suhartati T , Satria H , Hadi S 
Published: January 2021

Abstract
Production, purification and characterization of the α-amylase from local bacteria isolate Bacillus subtilis ITBCCB148 has been successfully carried out. The purified enzyme increased 149.9 times with specific activity of 115,500 U/mg compared to enzyme crude extracts. This enzyme has an optimum pH of 5.5 and an optimum temperature of 60°C and can maintain its stability at a temperature of 60-80°C, thus this enzyme is categorized as a thermostable enzyme.
Effect of glutaraldehyde addition on the stability of the α-amylase from Bacillus subtilis ITBCCB148
Authors: Witazora Y , Yandri  , Suhartati T , Satria H , Hadi S 
Published: January 2021

Abstract
α-Amylase is widely used in industry because of its ability to hydrolyze starch to glucose. Limited enzyme activity in extreme pH and temperature makes it necessary to increase enzyme stability. The purpose of this study was to improve the stability of the α-amylase from the bacteria Bacillus subtilis ITBCCB148 by chemical modification using glutaraldehyde (GA). The results showed that modified enzymes using glutaraldehyde 0.01; 0.03 and 0.05% have an optimum pH of 5.5; optimum temperature of 55°C; KM of 4.74; 5.03 and 3.87 mg/mL substrate; the Vmax of 285.71; 270.27 and 212.77 μmol mL−1 min−1; ki of 0.0183; 0.0111 and 0.0160 min−1; half-life (t1/2) 37.87; 62.43 and 43.31 minutes; ΔGi 102.656; 104.047 and 103.038 kJ mol−1, respectively. Chemical modification of the α-amylase from B. subtilis ITBCCB148 using glutaraldehyde can increase thermal stability by 1.6-2.7 times which can be seen from a decrease in the value of ki, an increase in half-life and ΔGi.
The Potency of Cinnamon as An Anti-Diabetic and Anti-Covid19 based on Its Mineral Content and Phenolic Compounds
Authors: Hapsari N R P , Wijayanti C , Subandi  , Suharti  , Mariana R R 
Published: January 2021

Abstract
The purpose of this study were to determine the mineral content (Cr, K and Ca) as well as total phenolic (TPC) and total flavonoids (TFC) in cinnamon, then to know the potency of some phenolic compounds in cinnamon as alpha amylase inhibitors and its binding activity to S protein of covid19. The mineral content was determined by the ICP method, while the TPC and TFC levels were determined spectrophotometrically. In silico analysis was carried out by docking techniques using human salivary alpha amylase and S covid19 protein as receptors and several polyphenol compounds in cinnamon as ligands. The results have shown that the levels of Cr, K, Ca, TPC and TFC of cinnamon, were 0.524 ppm, 4033ppm, 17453 ppm, 1.55% and 4.26%, respectively. The results of in silico analysis has shown that kaempferol 3-O-glucoside and quercetin in cinnamon are able to bind to human saliva α-Amylase on its active site with a binding affinity that are relatively the same as acarbose has. The docking analysis also has shown that kaempferol, quercetin and rutin of cinnamon were able to bind to the Receptor Binding Domain (RBD) of S protein of covid19, so that these compounds also have the potency to be anticovid19.
The analysis of hypothesis-deductive reasoning ability in learning particle dynamics
Authors: Pratama W. P. , Supriyatman  
Published: January 2021

Abstract
Hypothesis-deductive reasoning ability refers to the ability to think logically to formulate hypotheses based on existing scientific theories. This study aims to describe the hypothesis-deductive reasoning ability of Grade X students at Integrated Models Madani Senior High School Palu in learning physics, specifically on the topic of particle dynamics. This type of study is a qualitative research using a qualitative descriptive approach. The subjects in this study consisted of 26 students of Grade X Science 5 Integrated Models of Madani Senior High School Palu who had participated in studying the topic of particle dynamics. The instruments used include a hypothesis-deductive reasoning ability test and interview guidelines. The data obtained were then analyzed using descriptive analysis. The results of the analysis showed that the students’ hypothesis-deductive reasoning ability was 58.2%. This indicates that the students’ hypothesis-deductive reasoning ability is categorized as sufficient. The factor that affects the hypothesized-deductive reasoning ability is the learning process in the classroom as several students received the same form of questions, and the teacher provides direction as well as motivation, so that the classroom conditions are conducive.
Digital electronic practicum with logisim application using google meet
Authors: Dewantara D , Misbah M , Mahtari S , Azhari A , Sasmita F D , Melisa  , Rusmawati I , Kusuma L W , Ridho M H , Lutfi M 
Published: January 2021

Abstract
The focus of this research is to describe the effectiveness and response of students on the use of Digital Electronic Practicum with Logisim Application using Google Meet. The research subjects were 50 Physics Education Students of Lambung Mangkurat University taking the Digital Electronic course. The data of this study were collected by using practicum assessment sheets and students’ response questionnaire. The results showed that the mean score of practicum results from digital electronic practicum with Logisim application using Google Meet was 70.58. Thus, the effectiveness of the implementation of the Digital Electronic Practicum with Logisim application using Google Meet is in a good category. Data from the students’ response questionnaire was 3.83 in average, so it was categorized as good. Thus, it is concluded that the Digital Electronic Practicum with Logisim application using Google Meet is effective to implement and obtains a very good response from the students.
An analysis of students’ conceptual understanding using STEM approach educational videos
Authors: Putri A S , Saehana S 
Published: January 2021

Abstract
This study aims to determine and analyze the conceptual understanding of students who are taught using STEM approach learning videos on sound wave material. This research is a qualitative descriptive study. The research subjects consisted of 19 students of Grade XI of MAN 2 Palu Model in the even semester of the academic year of 2019/2020. The instruments used were a multiple choice test accompanied by a Certain of Response Index (CRI) which was given before and after being taught with STEM approach educational videos, as well as interviews. Respondents included those of high, medium, and low categories proficient students and were willing to do an interview test. The results of this study indicate that the comprehension of the material concept of students before being taught using the educational video integrated with the STEM approach can be categorized as low, and after given the educational video with the STEM approach, the students’ understanding of the concept increases. Therefore, educators can apply STEM approach learning videos in the learning process. For further researchers, this study can provide an overview of the conceptual understanding of students being taught with STEM-approached learning videos. Hence, researchers can develop research using other learning media or in a broader cognitive domain.
How to train problem-solving skills in physics using authentic learning
Authors: Wati M , Safiah S , Misbah M 
Published: January 2021

Abstract
Based on early observation, it is known that student’s problem-solving skills in one of SMAN Banjarmasin are still low. Research and development to produce a module of dynamic fluid with authentic learning to train student’s problem-solving skills were conducted. The objectives of this study were to describe the validity of module. This research used 4D models (Define, Design, Develop, and Disseminate). The data was collected and analyzed from the validation sheet that was rated by the practitioner and expert in physics education. The results showed that the validity of the module is 3,28 and categorized as valid. It can be concluded that the dynamic fluid module with authentic learning is suitable to be integrated within physics learning to train student’s problem-solving skills.
The perspective on monopoly as media in physics learning by using teams games tournament
Authors: Azizah N , Nengsih E W , Wati L , Rahimah  , Nastiti L R 
Published: January 2021

Abstract
This research aims to describe: 1) the use of Teams Games Tournament (TGT) cooperative learning model with the help of board-based gaming media, namely monopoly on physics learning; 2) the advantages and disadvantages of using TGT-type cooperative learning models assisted by monopoly media. This research method uses a library research approach. The technique to collect data is by reviewing the literature such as books, journals and documents that are considered in accordance with the study conducted. From the results obtained, it is concluded that 1) the use of cooperative learning model type TGT with the help of monopoly media gives influence to the quality of students learning, 2) the use of cooperative learning model type TGT assisted by monopoly media makes students’ attention focused so as to make it easier for students to digest materials, students are trained to think systematically and analytically and export their learning skills without having to rely on others. The monopoly media can improve students’ learning outcomes. However, the cooperative model of monopoly media assisted TGT type takes a while to learn for considerable.
The impact of problem-based learning and inquiry models toward students’ science process skills on the vibrations and waves chapter
Authors: Nurhayati  , Wahyudi  , Saputri D F , Trisianawati E 
Published: January 2021

AbstractScience process skills are basic skills that help students develop higher-order skills. These skills can be trained in science learning with a scientific learning approach. This study aims to determine students’ science process skills that are influenced by problem-based learning models and inquiry models. The research method used is an experimental method with a quasi-experimental design. The research sample consisted of two classes of students of class VIII SMP. Science process skills data is measured by a description test which has valid criteria and high reliability. Descriptive and inferential analysis techniques are used in the data analysis of science process skills. The results of the data analysis concluded that: (1) The students ‘science process skills after applying the problem-based learning model were classified as good, (2) the students’ science process skills after being applied to the inquiry model were classified as very good (3) there was no significant difference between science process skills which are taught using problem-based learning models and inquiry learning models.
Application of generative learning in physics learning
Authors: Yuliani H , Ulfah R Y , Agustina E , Al-Huda A M , Qamariah Z 
Published: January 2021

Abstract
This study aims: (1) to determine the application of generative learning in physics learning; (2) to determine the advantages of generative learning in the physics learning process; (3) to determine the constraints of generative learning in physics learning. The research method is literature study. Data was collected based on information obtained from various literature. Research shows that: (1) the application of generative learning in physics learning can improve learning outcomes, understanding of physics concepts, generic science skills, and able to reduce student misconceptions; (2) generative learning makes students more active, creative and critical in developing the knowledge obtained, discovering phenomena and solving problems. Meanwhile, the teacher will be skilled at organizing and understanding students’ ideas; (3) The application of generative learning requires accuracy of methods and modification of strategies as well as careful planning and preparation. In addition, simulation is needed in a generative learning model to familiarize students. Teachers are required to be more observant and creative in expressing students’ ideas. Generative learning is better applied to high school students.
Create an interactive video about alternative energy sources from fruits to optimize student creativity
Authors: Dewantara D , Mahtari S , Misbah M 
Published: January 2021

Abstract
Creativity is a skill that must be sharpened in the era of Society 5.0. The purpose of this study was to describe students’ creativity in making interactive videos about alternative energy sources from plants. The subjects in this study were students of the Physics Education Study Program taking Energy Physics courses. The study was conducted in the even semester of 2019/2010. This study employed an analytical descriptive study. The instrument used was the student’s creativity observation sheet. The results of the study have shown that the mean results of observations of student creativity are 3.22. Thus, it can be concluded that students’ creativity in making interactive videos about alternative energy sources from plants is in a relatively good category. It is necessary to re-examine what the next effort is to increase student creativity.
A conceptual framework of STEM education based on the Indonesian Curriculum
Authors: Sujarwanto E , Madlazim  , Sanjaya I G M 
Published: January 2021

Abstract
Technological and economic developments through the industrial revolution 4.0 motivate the Indonesian education sector to prepare students for this challenge. One of the efforts is to use STEM-based learning. Existing activities and research have demonstrated interdisciplinary integration in STEM education, but it is not clear yet. Besides, STEM education needs to be suited to Indonesian Policy and Curriculum related to science, technology, and mathematic. Thus, STEM education practice needs a conceptual framework. We use the literature review method. We examine education policy in Indonesia and research related to STEM education to create a conceptual framework for STEM education. The result is a proposed conceptual framework that suggests the practice of STEM education must know and maintain the principles of science, technology, and mathematics based on the characteristic of the Indonesian Curriculum. Also, the practice of STEM education needs to pay attention to the interrelationship of the four STEM disciplines, involve the engineering design process, involve the community of practice, and use a supportive learning model. Although this conceptual framework is theoretical, it could be useful in deciding a sufficient practice of STEM Education in Indonesia and designing appropriate activities in practising integrated STEM Learning.
Ethnomathematics of the Jami Mosque Jingah River as a source mathematics learning
Authors: Fajriah N , Suryaningsih Y 
Published: January 2021

AbstractEthnomathematics was a contextual approach that uses the environment and culture. The study aims to explore the relationship between mathematics and the Jami Mosque Jingah River culture in mathematics learning and provides ethnomathematics options as a learning resource for students during the COVID 19 pandemic. This study uses an ethnographic approach, which was an empirical and theoretical approach to obtain an in-depth description and analysis of a culture based on field notes that been obtained from the results of data collection. The results showed that there are a lot of components, ornaments, and objects in the Jami Mosque Jingah River containing many mathematical concepts of lines, vertices, properties, perimeter and area, especially in the field of geometry. During the COVID 19 pandemic, the teacher gave students the task of looking for information and observing pictures of the Jami Mosque Jingah River. that These are the students’ activities: (1) identify the types and properties of flat shapes (2) use contextual problems related to these flat shapes, (3) combine flatways at the Jami Mosque Jingah River that can generate creative thinking skills students. For suggestion, mathematics teachers in junior high schools can apply this study’s results to improve higher-order thinking skills and become more familiar with their culture.
Understanding the prospective physics teachers conception of the characteristic of sound
Authors: Saparini S , Misbah M , Rizaldi W R 
Published: January 2021

Abstract
This study aimed to analyze the level of conceptual understanding of prospective teacher students of sound characteristics. This research was descriptive. The subjects were students of Physics Education at Sriwijaya University and Lambung Mangkurat University who participated in wave courses totaling 69 people. The data were collected using a previously developed diagnostic test instrument and modified according to research needs. The data were analyzed using descriptive statistics. The results showed the percentage of conceptual understanding possessed by the respondents (1) 52.17% on pitch and loudness of sound waves from two people shouting simultaneously; (2) 42.11% on the speed of sound wave propagation; (3) 2.90% on the wave superposition concept; and (4) 5.80% on sound reflection. There are still misconceptions occur, the velocity of propagation of sound waves is influenced by the amplitude and frequency of the sound, and a dust particle in front of the sound source will move influenced by the sound’s loudness. Overall, the level of conceptual understanding of some of the characteristics of sound wave concepts varies, and alternative concepts are still emerging, so it needs learning innovations to overcome these problems.
Utilization artificial intelligence to improve creativity skills in society 5.0
Authors: Oktradiksa A , Bhakti C P , Kurniawan S J , Rahman F A , Ani  
Published: January 2021

Abstract
The purpose of this research is to take advantage of Artificial Intelligence which is used to increase Creativity Skills in the era of society 5.0. Data collection is done to see subtle problems and develop solutions. Technique data collection is a literature study. Creativity Skill is one of the abilities that students must have to answer challenges, namely the era of society 5.0. The era of society 5.0 is an era where new values created by technological developments can minimize human responsibility and future economic problems. In this case, Artificial Intelligence is a way to maximize students in social change which requires someone to be innovative, creative by emphasizing contextual learning in which students must be active. Artificial intelligence (AI) enables machines to learn from experience, adapt to new inputs and perform human-like tasks. Most of the AI you hear about today - from computers playing chess to adult cars - rely heavily on deep learning and comparing natural language. Using this technology, computers can complete specific tasks by processing large amounts of data and managing patterns in the data so that it is hoped that the use and development of Artificial Intelligence can increase creativity skills to face opportunities and challenges in the era of 5.0 society.
Train students’ science process skills and self-efficacy in online learning using the Scientific Critical Thinking (SCT) model assisted by google classroom and google meet
Authors: Rusmansyah  , Hayati N , Winarti A , Rahmi  
Published: January 2021

Abstract
Science process skills and self-efficacy need to be trained in students in chemistry learning activities at school. This will have a positive impact on students in facing and solving problems in their lives. The Scientific Critical Thinking (SCT) model is one of the models that can be used to implement learning. This research was conducted at SMAN 11 Banjarmasin, class XI MIPA 2, on the buffer solution’s material, assisted by google classroom and google meet. This study aims to determine (1) the improvement of students ‘science process skills (2) students’ self-efficacy, before and after learning with the SCT model, and (3) student responses to the application of the SCT model assisted by google classroom and google meet. This research method is a pre-experiment, one group pretest-posttest design. The research sample of class XI MIPA 2 students used a purposive sampling technique. The independent variable is the SCT model; the dependent variable is science process skills and students’ self-efficacy. Data collection using test and non-test techniques. The data analysis technique used descriptive analysis and inferential analysis. The results showed that (1) there was an increase in students’ science process skills; (2) there is an increase in student self-efficacy (3) Students’ positive responses to learning with the SCT model assisted by google classroom and google meet.