bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterization of catechin microcapsules from gambier using modified flour coatings from bengkuang
Authors: Yeni Gustri , Firdausni  , Three Anova Inda , Kamsina  , Wahyuningsih Tri 
Published: June 2021

Abstract
Active compounds of catechin from gambier have several disadvantages, which include being difficult to dissolve in water and not easily oxidized. Therefore, to overcome these disadvantages, they are coated with starch matrix. The modified starch from jicama (bengkuang) was produced from acid hydrolysis process, precipitated with alcohol therefore, it has a helical hole, porous structure and functions as a matrix. The aim of this study was to determine the effect of modified starch from bengkuang as a matrix on the characteristics of catechins microcapsules from gambier. The treatments tested include the ratio of catechins in modified starch (25%, 50%, 75%), a speed of 6000 rpm, and stirring time of 15 minutes on the emulsification process. The parameters observed consisted of the loading capacity of catechins in coatings, morphology (SEM), antioxidant activity, and Fourier Transform Infrared (FTIR) analysis. The results of this study showed that catechins which were encapsulated at a ratio of 1:3, had the highest antioxidant activity, i.e. 15.30 ppm with morphology of the sphere being smooth. The material ratio which affects the surface of the catechin microcapsules with elemental mapping, showed that the brighter the colour, the higher the amount of catechin concentration in encapsulation. Furthermore, the FTIR analysis showed the binding of catechins ingredient in the matrix with new absorption peaks at wavelengths of 1240 cm−1, 1286 cm−1 and 1366 cm−1. Therefore, catechin microcapsules encapsulated with modified starch, have shown good resistance to air/oxygen diffusion during storage.
Very low frequency/low-frequency receiver for monitoring disturbances in the ionosphere D layer
Authors: Suryana Rizal , Manik Timbul , Lathif Musthofa , Suriana  , Batubara Mario , Sitompul Peberlin 
Published: June 2021

AbstractThe Ionosphere layer can influence radio wave propagation from one place to another place with a very long distance on the Earth and between satellites to the receiver. Each ionosphere layer has different characteristics and the presence of the ionosphere changes daily according to solar activity. The D layer is the innermost ionosphere layer, starting about 60 - 95 km above the Earth’s surface. Observation of the D layer cannot be carried out by balloon, ionosonde, and satellite because it is too low so that continuous observation is very difficult. VLF/LF radio web can be traveled hundreds to thousands of kilometers from the transmitter with multiple reflections between the earth and the ionosphere that is known as the Earth-Ionosphere WaveGuide (EIWG). VLF/LF receiver is an instrument that can be used to observe changes in the low region ionosphere layer due to solar activities.
Colorimetric properties of batik fabrics colored using gambier liquid waste
Authors: Failisnur F , Sofyan S , Silfia S 
Published: June 2021

Abstract
The process of batik and colouring on cotton and silk using gambier liquid waste, through the wax removal process in hot temperature affects the color characteristic and fastness properties of the fabric. The purpose was to study the effects of the batik process on the color and fastness properties the dyed fabrics. The study was conducted with the use of soda ash as the wax removal, and CaO, FeSO4, Al2(SO4)3 as mordant with post mordanting method on cotton and silk fabrics. The results showed that the batik process affects the can provide varying color strength (3.7 - 16.7) with color coordinates in the range of yellowish (7.7 - 19.9) to reddish (5.7 - 24.8) and fairly good color fastness to excellent against washing, rubbing and light effects. The highest color strength was obtained when using mordant FeSO4 which was applied to silk.
Application of Analytical Hierarchy Process in Evaluating the Student Acceptance of E-Learning Implementation for Logic and System Modelling Learning
Authors: Aurachman Rio , Ardin Ghifari Muhammad 
Published: June 2021

Abstract
The logic and modeling of systems thinking are studied by students in various subjects, one of which is mathematics. An e-learning system can be used to learn these abilities. Survey was conducted using sample from student in Information system design courses. The data obtained was evaluated using the Analytical Hierarchy Process. The AHP method was chosen in order to obtain an effectiveness comparison between e-learning tools and face-to-face learning in the classroom.
Practicality of Learning Design Based on Realistic Mathematics Education of Derivative Topic for Grade XI Senior High School
Authors: Sari R P , Armiati  , Permana Dony 
Published: June 2021

Abstract
The derivative is one of the important subjects in mathematics. One of the goals of derivative learning is that students can solve math problems in real life. In this study, derivative learning design was developed based on Realistic Mathematics Education to make the products that consist of teacher books and student books to improve students’ mathematical problem-solving skills. The development models are used Plomp and Gravemeijer & Cobb models. Data collection was the form of questionnaires filled out by teachers and students. Then, the data is analyzed by using descriptive analysis. The results of this study can be concluded that the practical value of teacher response 81.25% and the practicality value of student response is 82.04%, so the design of learning derivative topics based on Realistic Mathematics Education has been categorized as practical. It means the RME-based learning design of derivative topics developed in teacher and student books can be used to develop students’ mathematical problem-solving skills.
The Impact of Application on Calculus 1 Teaching Materials by Using Google Classroom Media to Increase Students’ Motivation
Authors: Arnellis  , Jamaan E Z , Amalita N , Rosha M , Fitria D 
Published: June 2021

Abstract
This study aims to describe the impact of using Google classroom media on student learning motivation in the Calculus 1 course. The type of research was used descriptive with One Shot Case Study design. The subjects in this study were students of Semester II who were taking the Calculus 1 course in the Mathematics Study Program of the Faculty of Mathematics and Natural Sciences, UNP which were 33 students. The instruments used in this study were a motivation questionnaire sheet and a student learning outcome test. The data analysis used was descriptive analysis by using the difference test. The results showed that students’ motivation after the implementation of lectures using Google classroom media was better than before using Google classroom. This is indicated by the motivation score obtained was 62.26 or 51.62 % in moderate. Furthermore, the average score of student learning outcome of Calculus 1 after using Google classroom media is 81.63 with sufficient criteria.
Improved Understanding of Student Particle Dynamics Concepts Using Basic Physics Modules Based on Concepts
Authors: Juita Dewi , Alwis  , Yusmaridi M 
Published: June 2021

Abstract
This study stems from the results of observations made by researchers who found that students had difficulty in drawing free diagrams in solving particle dynamics problems that indicated students did not understand the concept of dynamics correctly. Students have difficulty in changing information from one form to another. One of the students’ understanding of the concept of Particle Dynamics is one of them caused by the lack of use of appropriate teaching materials in learning Particle Dynamics. This basic concept-based physics module has a concept column that explains the concept of Particle Dynamics precisely. Modules are also equipped with sample questions and discussion related to concepts in the Particle Dynamics material. The purpose of this study was to find out how to increase understanding of students’ particle dynamics concepts after using a concept based physics module. The sample of this research was 28 Semester 1 Department of Biology Education IAIN Kerinci students, who were 28 students taking Basic Physics courses. The research method used is a pre experimental method with one group pretest posttest design. Research data were analyzed using <N-Gain>. The results obtained an increase in the medium category with an average value of N-Gain <N-Gain> of 0.51. This increase occurs in indicators interpreting, modeling, classifying, summarizing, summarizing, comparing, and explaining
Correlation between Learning style and achievement in Physics Learning
Authors: Halim A , Wahyuni A , Susanna  , Elisa  , Hamid A. , Irwandi  
Published: June 2021

AbstractThis study aims to determine the relationship between learning styles and student learning outcomes in physics subjects. The research using survey techniques and documentation with using questionnaires and documentation method for data collection. Questionnaires are used to obtain data of learning style variables, while documentation is used to obtain data of learning outcomes variables. The results of data analysis, with the product moment correlation technique, show that there is a correlation of positive and significant relationship between learning styles and student learning outcomes in physics course. In addition, the results of the study also showed that the greatest contribution of learning styles to learning outcomes was in analytic and holistic learning styles.
The Effect of Instruction Model Using Media and Motivation on Chemical Learning Results (Study of The Effect of Instruction Models Using Media and Motivation in Learning)
Authors: Sugiharti Gulmah , Ricky Ananda Wildya 
Published: June 2021

Abstract
This study aims to determine the effect of instruction models using animation and motivation on student chemical learning results and the interaction between instruction models and motivation. The study was conducted on all students of class XI IPA SMA Negeri 10 Medan in 3 classes and samples were taken randomly. This research is an experimental research with 2x2 factorial anava design. The factors tested were PBL model factors with Macromedia Flash, PBL models with Power Point media, while motivational factors with high and low criteria. Based on the hypothesis test at a significant level a = 0.05, it was obtained that Fcount (A) was 5.530, Fcount (B) was 29.584, and Fcount (AB) was 4.556, while the price of Ftable (0.05) (1.56) = 4.01 then Fcount> Ftable which means there is influence and interaction of learning models using animation media and motivation on student learning results. The results of this study indicate that students who are taught with the PBL model using Macromedia Flash media on highly motivated students show the highest average of 85,667, and the average of low motivated students is 80.000. Furthermore, students who were taught with the PBL model using Power Point media on highly motivated students showed an average of 85.294, and an average of students with low motivation was 72.308. Thus it was concluded that in chemical learning the topic of buffer solutions is better to use PBL models with Macromedia Flash media.
The effect of guided inquiry learning models using the help of student activity sheet on the knowledge competency of students in class xi of SMAN 1 Sungayang
Authors: Nurlaila N , Lufri L 
Published: June 2021

AbstractThis research is motivated by a learning process that is still teacher-centered. Students are still waiting for instructions from the teacher and are less active in implementing the learning process. The lack of teaching materials used by teachers and learning models that do not vary become one of the causes of low student learning outcomes. To overcome this problem, teachers are required to be able to use diverse learning models to improve students’ knowledge competencies. One learning model that can enable students is the guided inquiry learning model supported by student worksheet. This study aims to determine the interaction of student worksheet -assisted inquiry models with students’ knowledge competence at SMAN 1 Sungayang. This research is an experimental study with a Randomized Control Posted Only Design. The population in this study were students of class XI IPA SMAN 1 Sungayang. Data analysis techniques to test hypotheses using independent sample T-test. Hypothesis test results showed a significant effect on student learning outcomes by obtaining a small significance value of 0.05 which is 0.008 with an average value in the experimental class 84.40 while the control class 77.74.
The identification of preservice biology teacher’s misconceptions on the concept of mangrove ecology using the certainty of response index (CRI)
Authors: Hindrasti N E K , Putri A N 
Published: June 2021

Abstract
The integration of mangrove ecological concepts and contexts in biology learning is expected to support maritime-based education. The concept of mangrove ecology is important to understand by preservice biology teachers, especially in coastal areas. The real knowledge and experience of preservice biology teachers in coastal areas related to mangroves is predicted to be different from the concept of mangrove ecology that has been studied by experts. This causes misconceptions that can affect the integration of the concept of mangroves ecology in biology learning. To analyzed the misconceptions of preservice biology teachers, the Certainty of Response Index (CRI) method was used. The instrument used was a multiple choice test equipped with a confidence level in answering it. Identification of misconceptions using CRI was carried out to determine the level of understanding and misconceptions of preservice biology teachers, then also to identify what sub-concepts these misconceptions occurred. The research was conducted on 12 preservice biology teacher who took mangrove ecology courses in the 2018/2019 school year. The results of the average distribution preservice biology teacher’ understanding levels are 45% understanding of the concept, 7% guessing, 8% not understanding the concept, and 40% misconception. The sub-concept with the most misconceptions was the mangrove research method as much as 47.92%, while the least occurred in the sub-concept of mangrove resilience 33.33%. Given the high level of misconceptions, it is necessary to increase the understanding of the concept of preservice biology teacher related to the concept of mangrove ecology. The use of the CRI method can be used to distinguish groups between students who experience misconceptions and students who lack of knowledge but are unable to explain the reasoning process and the specific causes of misconceptions that occur in students. In order for misconceptions to be identified more specifically and accurately, a combination of other techniques is needed in addition to the use of tests to carry out further misconception analysis.
Validity level analysis model PjBL for biology learning
Authors: Hajar I , Lufri  , Fauzan A 
Published: June 2021

Abstract
Researcher has develop based model project based learning, this model known as the PjBL for Biologi learning. The purpose of this research is to know the level validity model developed. PjBL developed for learning biology in the study education biology program at Riau of Islamic University (UIR). This research uses the method R & D, the model used the model Plomp (2013 ). Data collection techniques using a technique. interviews and survey. Data analysis by determining the s cohen’ kappa berbantuan spss version 20. The results of the study explained that book model PjBL developed being used to the revision of small. Guidebooks work lecturer developed very reasonable used with small revision. Guidebooks work student who developed very reasonable used with small revision. The study conclusion PjBL model developed very reasonable used learning in biology.
Literature Study: Utilization of Android-Based Learning Media Using Adobe Flash CS 6 (As An Educational Solution During The Covid-19 Pandemic)
Authors: Irawan Rio 
Published: June 2021

AbstractThis literature study aims to determine the use ofAndroid-Based Learning Media as a solution during the Covid-19 pandemic in Indonesia. The data used is secondary data using the literature method, namely by studying and reading literature related to the problems that are the object of research, such as books, articles, journals, surveys, news and other documents. The results of the study reveal that the number ofAndroidusers in Indonesia is quite high and increasing every year, such as in 2015-2018 an increase of 27%, so it will be effective if used as a learning medium. In addition, this pandemic condition causes the need for the use ofAndroid-based Learning Media to be quite significant. In contrast to the ability of educators in mastery of technology, there are only 40% of educators who are ready for technology because for media creation at this time sufficient technological capabilities are needed, so the use ofAndroid-Based Learning Media is quite low, especially those usingAndroidapplications based onAdobe Flash CS6. Where it is necessary to have regular training so that the competence of Educators is in accordance with the demands and conditions of the times. Especially with the current condition of the Covid-19 Pandemic, the ability of teachers in technology is needed to support the learning process. so that the use ofAndroid-Based Learning Media is quite low, especially those that useAndroidapplications based onAdobe Flash CS6. Where it is necessary to have regular training so that the competence of Educators is in accordance with the demands and conditions of the times. Especially with the current condition of the Covid-19 Pandemic, the ability of teachers in technology is needed to support the learning process. so that the use ofAndroid-Based Learning Media is quite low, especially those that useAndroidapplications based onAdobe Flash CS6. Where it is necessary to have regular training so that the competence of Educators is in accordance with the demands and conditions of the times. Especially with the current condition of the Covid-19 Pandemic, the ability of teachers in technology is needed to support the learning process.
The Potential of Podcast as Online Learning Media for Supporting Visual Impairment Students to Introduction to Education Course in Universitas Negeri Padang
Authors: Kusumastuti Grahita , Supendra Dedi 
Published: June 2021

Abstract
Education equality has been a critical issue in higher education where the students with special needs should obtain the equal opportunities to acquire knowledge through the appropriate learning methods and media. This article discussed the analysis of the potential of Podcast as learning media for inclusive students, specifically for those with visual impairment in online educational setting. This study conducted the qualitative methods with focus group discussion to collect the data. Four blind students from Special Education Department, Faculty of Education in Universitas Negeri Padang involved through video conference application, Zoom, approximately 50 minutes. There were two aspects would be analysed, such as: the characteristic of the learners and the course, and current learning situation. For the results, it is indicated from the students that there should have been certain methods and media to increase the engagement of inclusive students to the materials provided in online learning. As the students have difficulty in visual ability, it is necessary to develop a specific learning media to help the students cope with the problems. Developing Podcast for learning is expected to be one of the strategies to help blind students understand the topic studied more easily.
Climate-driven phenological changes in the Russian Arctic derived from MODIS LAI time series 2000–2019
Authors: Shabanov N V , Marshall G J , Rees W G , Bartalev S A , Tutubalina O V , Golubeva E I 
Published: June 2021

AbstractArctic surface temperature has increased at approximately twice the global rate over the past few decades and is also projected to warm most in the 21st century. However, the mechanism of Arctic vegetation response to this warming remains largely uncertain. Here, we analyse variations in the seasonal profiles of MODerate resolution Imaging Spectroradiometer Leaf Area Index (LAI) and ERA-interim cumulative near-Surface Air Temperature (SATΣ) over the northern Russia, north of 60° N for 2000–2019. We find that commonly used broad temporal interval (seasonal) trends cannot fully represent complex interannual variations of the LAI profile over the growing season. A sequence of narrow temporal interval (weekly) LAI trends form an inverted S-shape over the course of the growing season with enhanced green-up and senescence, but balanced during the growing season’s peak. Spatial patterns of weekly LAI trends match with those of weekly SATΣtrends during the green-up, while the drivers of the browning trends during senescence remain unclear. Geographically the area with the statistically significant temperature-driven enhanced green-up is restricted by a large patch carrying significant positive SATΣtrends, which includes North Siberian Lowland, Taimyr, Yamal and adjacent territories. The strength, duration and timing of the changes depend on vegetation type: enhanced green-up is most pronounced in tundra, while enhanced senescence is pronounced in forests. Continued release of the climatic constraints will likely increase the capacity both of the environment (i.e. permafrost thawing) and vegetation (i.e. appearance of more productive woody species), and transform LAI seasonal shifts to change of LAI seasonal amplitude.
The role of lake morphometry in modulating surface water carbon concentrations in boreal lakes
Authors: Casas-Ruiz Joan P , Jakobsson Julia , del Giorgio Paul A 
Published: June 2021

Abstract
Earth’s lakes vary greatly in size and morphometry, from small circular lakes of hundreds of m2 to large and deep fractal systems of several thousands of km2. Previous research has demonstrated a link between the size of lakes and their carbon dynamics. However, the influence of lake morphometry on lake carbon biogeochemistry remains largely unexplored. Here, we analyze the morphometry and carbon concentrations of more than 250 lakes across boreal Quebec, encompassing a wide range in lake size from 0.002 to 4300 km2. We show that, in addition to lake size, the biogeochemistry of lake carbon is influenced by the circularity, shoreline complexity and vertical profile of the lake. Yet the type and degree of influence vary among the different carbon species. A comparative exercise shows that taking into account the morphometry of lakes moderately increases the predictive power of empirical models of carbon concentration across lakes. Therefore, future studies might benefit from adding lake morphometry metrics to the empirical rules used for prediction and upscaling.