bluuebunny/crossref_metadata_2025_split huggingface dataset:
Validity of integrated natural science teacher book with theme senses of sight and optical devices using connected model integrated 21st century learning
Authors: Melati Ayu , Weri Firda , Ratnawulan  , Syafriani  
Published: May 2020

Abstract
This study aims to determine the validation of Integrated Natural Science teacher book with the theme senses of sight and optical devices using Connected model Integrated 21st Century Learning at the junior high school in Kerinci district. This research method used research and development, using Plomp development model. The instrument used was a validation questionnaire. The data collection technique uses a validation questionnaire that was previously validated by five validators. Data collected was analyzed using descriptive qualitative through assessment and percentage. Results of analysis the validation of Integrated Natural Science teacher book with the theme senses of sight and optical devices using Connected model Integrated 21st Century Learning has an average value of 0,88 this is showed that is developed was valid.
Need analysis in the development of teaching materials with problem solving-collaborative models in quantum physics courses
Authors: Hidayati  , Elizar  , Festiyed  
Published: May 2020

Abstract
This study aims to analyze preliminary data on the conditions of quantum physics lectures as a necessity in developing teaching materials. This research is the initial stage of research and development, namely preliminary research. Data collected using interviews with lecturers, questionnaires to students and study documentation. Data analysis techniques used in the form of descriptive statistical analysis. From the data analysis that has been done it can be stated that the available quantum physics teaching materials have not varied. Second, the assignments given in lectures on quantum physics have been able to help students understand the material. Third, students have sufficient potential in understanding the material, but the percentage of students who have ideas in solving problems and who are able to correct answers from friends, want to work collaboratively and who actively ask questions is still low. For this reason, it is necessary to develop media and teaching materials to improve the lecture and collaborative processes of students.
Supporting STEM and critical thinking on energy transformation topic: pre-study of digital reality book
Authors: Muttaqiin A , Putri R E , Sari M P , Lufri L , Rahim F R 
Published: May 2020

Abstract
Technology is growing rapidly. Many devices could be used to support the learning process in the classroom, particularly in integrative science learning. Nowadays, learning materials can be acquired through various digital forms. In this study, the tendency of the needs and interests of students toward learning materials, specifically in energy transformation topic, would be briefly explained. Based on the data obtained, students were more curious when they were provided the supporting learning materials such as pictures and videos while learning the energy transformation topic. The data illustrated that 64.3% of respondents stated that the combination of text, images, and videos enhanced their curiosity on the matter. Some questions must also be provided to improve their STEM knowledge and critical thinking. Therefore, Digital Reality Book with many features can be selected as an alternative to deliver learning material about Energy Transformation in supporting STEM and critical thinking.
Availability of learning resources for enrichment learning at senior high school in West Sumatra
Authors: Festiyed  , Desnita  , Afradisca Elfa , Sari Iis Purnama 
Published: May 2020

Abstract
The ongoing learning process consists of planning, implementation, assessment and evaluation, reflection, feedback, and further revision or new planning. The results of the evaluation of competency achievement by students determine the feedback action and the next plan that will be carried out by the teacher. Based on the results of the evaluation, students are divided into two groups, namely groups that have achieved competence and groups that have not yet achieved it. The first group needs enrichment learning while the second group needs a remedial program. A survey of 24 Senior High Schools in West Sumatera was conducted to obtain information about the implementation of enrichment learning. The data collection instrument used is questionnaire and observation sheet. Information is obtained that teachers rarely carry out enrichment learning, because when children are in school it is fully filled with regular learning activities and teaching materials used by teachers only textbooks, which are only used up for regular learning activities. Referring to the information obtained, it can be said that Senior High School physics learning requires teaching materials that facilitate students learning outside the classroom. These teaching materials should facilitate students to learn without a teacher. So that teaching materials attract students’ interest must be packaged in such a way, for example ICT-based. One learning resource that meets these needs is a contextual-based physics module. To be practical and make it easier for students to adjust the place and time of each, then the most appropriate is the e-module physics. Based on observations made, there are no physical e-modules in the school observed. Referring to the problems that have been obtained, it can be concluded that to help teachers solve problems, contextual physics based e-modules need to be developed.
Preliminary analysis of integrated science teaching based on edupark of Anai Land
Authors: Delvi Meri , Rifai Hamdi 
Published: May 2020

Abstract
Utilizing environment-based media in learning can better understand the natural phenomena that occur in everyday life, the environment provides a variety of things students can learn, and the use of the environment allows for a more meaningful learning process. One of them is utilizing natural tourism objects which lately are very popular with tourists. Tourism is not just a place to enjoy the natural charm and games provided. Attractions as integrated learning resources (edupark) have not been fully utilized, one of which is Anai Land attractions. To support Anai Land as the Edupark Science School, plu to study Integrated Science learning material that can be learned through Anai Land tourist destinations. Based on this, analyze the integrated science learning material used in schools with potential learning resources in Anai Land tourist attractions. This type of research is a preliminary analysis. The data taken in this study was obtained by interviews with educators as well as a description of the potential direct learning of natural sciences with the Anai Land tourism method. Based on the results of the research conducted, it is evident that there is a need to develop edupark based teaching materials on natural science learning.
Senior high school mathematics learning device development based on guided discovery to improve students’ reasoning ability (preliminary research)
Authors: Faizasari A , Yerizon  , Permana D 
Published: May 2020

Abstract
Students’ mathematical reasoning ability that can be found in the field has optimal yet, this can be seen from school learning, and teacher has yet got the students to get used to solve the mathematical reasoning questions. The purpose of this research is to produce mathematics learning device based on guided discovery to improve students’ reasoning ability. This is a development research. The development model in this research is plomp model which consists of three phases, namely, preliminary research, development or prototyping phase, and assessment phase. The researchers hinge only on preliminary research. The result of the data analysis on this first phase revealed that: 1) the students’ reasoning ability is not yet optimal. 2) Some students’ still think mathematics is a difficult subject to learn. 3) The development of student worksheet is of vital importance in order to be able to comprehend the learning material. 4) Students expect that student worksheet will discuss problems related with mathematics knowledge in daily life as well as problem related with their individual activity.
Improving the problem-solving skills through the development of teaching materials with STEM-PjBL (science, technology, engineering, and mathematics-project based learning) model integrated with TPACK (technological pedagogical content knowledge)
Authors: Purwaningsih Endang , Sari Annisa Maya , Yuliati Lia , Masjkur Kadim , Kurniawan Bahrul Rizky , Zahiri Megat Aman 
Published: May 2020

Abstract
The biggest challenge for teachers in this industrial revolution 4.0 is to create a learning design that improves students’ problem-solving skills. Many students face difficulties in applying physics concepts in life since their problem-solving skills are relatively low. Therefore, valid, practical, and effective teaching materials with the STEM-PjBL model integrated with TPACK can be used as the breakthrough. This learning tool is packaged in five steps with various learning experiences, and the students are directly involved in using ICT, making a video, PPT, and using moodle. This research and development used 4D design with four stages, i.e., 1) define, 2) design, 3) develop, and 4) disseminate. In the define and design stages, need analysis and development of draft teaching materials were carried out. Development is an expert validation stage, and its results were declared as very valid. Dissemination is a limited trial phase with one group pretest-posttest design to see its practicality and effectiveness. The results of dissemination were stated to be very practical, showing that the learning plan can be well implemented. The students’ problem-solving skills increased after they attended learning by using the developed device. Other findings showed that students were more excited, happy, and comfortable in learning physics.
Development of high school physics class XI book, based on concept map to enhance the high-level thinking skills (HOTS)
Authors: Gusnedi G , Ratnawulan R , Putra A 
Published: May 2020

Abstract
Low high-level thinking skills (HOTS) of students, especially in physics can not be separated from the process of learning activities of students in schools that have not emphasized the student-centered. One problem is the books or reading material that is used by high school physics students and teachers have not led to the aspects of cognitive domains that are part of high-level thinking skills. Based on those developed for high school physics textbook using concept maps in both the material and the exposure to examples and exercises for students. The study aims to gain if the book is worth to be used in schools. Development model used in this study is a model of Plomp. ModelPlomp consists of three stages of development that preliminary research (initial investigation), prototyping phase (phase prototypes) and assessment phase (phase assessment). To assess the feasibility of this book used some experts consisting of several professors of physics and school physics teacher. The results of the feasibility test of power obtained an average score of 3.65 with very good category. Feasibility in terms of the depth of material, kesesuai with the development of the students thought patterns and linkage map concept with high-level thinking skills. While the results of feasibility assessment of conformity with the curriculum, the ease of understanding the text, the feasibility of the exercise presented by the teachers obtained a score of 3.80. The results of the feasibility test of power obtained an average score of 3.65 with very good category. Feasibility in terms of the depth of material, kesesuai with the development of the students thought patterns and linkage map concept with high-level thinking skills. While the results of feasibility assessment of conformity with the curriculum, the ease of understanding the text, the feasibility of the exercise presented by the teachers obtained a score of 3.80. The results of the feasibility test of power obtained an average score of 3.65 with very good category. Feasibility in terms of the depth of material, kesesuai with the development of the students thought patterns and linkage map concept with high-level thinking skills. While the results of feasibility assessment of conformity with the curriculum, the ease of understanding the text, the feasibility of the exercise presented by the teachers obtained a score of 3.80.
Knowledge analysis of students in disaster mitigation mount erupts
Authors: Kurnia Rizki , Fauzi Ahmad 
Published: May 2020

Abstract
The purpose of this study was untukmenganalisis the extent to which the knowledge of students in disaster management volcanoes and coherence of the matter physics. This type of research is descriptive qualitative peneitian. The sample used in this study are students of class X SMA N 1 Batipuh. The result is knowledge migasi learners to disasters volcanoes of 61.33% categorized as very poor and linkages with disaster physics of matter volcanoes obtained at KD 3.9 on material and energy businesses and KD 3:10 on the material momentum and impulse.
Further development of the modified Eddy Dissipation Model
Authors: Chen Yongliang , Huang Qinhuang , Wang Peiyong 
Published: May 2020

Abstract
The eddy dissipation model (EDM) has been used extensively in turbulent combustion modelling because of its simplicity, good convergence, and reasonable accuracy. A modified EDM model was developed to improve the accuracy of the model a few years ago. In the application for the jet flame and the opposed jet flame, it demonstrates very good accuracy. However, in the application for the bluff body diffusion flames, its accuracy is not good enough. In the current study, it is found out that the existence of wall of these flames influences the simulation accuracy. In the region near the wall, the ratio of turbulence dissipation rate to turbulent kinetic energy is too large and causing too high combustion reaction rate which is not realistic. By adding a limit to this ratio, the reaction rate near wall will be reasonable. The further developed modified version of EDM model gives very good prediction accuracy for the jet flow and the bluff body flow. With this near wall treatment, the modified EDM model will show good performance for internal combustion and free jet combustion.
A procedure for power consumption estimation of multi-rotor unmanned aerial vehicle
Authors: Chan C. W. , Kam T. Y. 
Published: May 2020

Abstract
Unmanned aerial vehicles (UAVs) have the potential to find many commercial applications, which may require relatively long mission times. Therefore, it is important to make UAVs that can complete the mission in an efficient and power saving way. To achieve a prescribed flight mission, a UAV has to perform a number of maneuvers/movements, which will consume a certain amount of power. To maximize the cruising time, not only the power source is able to provide enough amount of power to the UAV but also the parts of the UAV can perform efficiently to save power. Before the minimum power capacity can be determined, it is required that the power consumptions of the UAV parts for the required mission be evaluated in a proper way. In this paper, a procedure is presented to estimate the power consumption of a composite UAV. The configuration as well as the fabrication of the UAV using truss-type parts made of carbon strand/epoxy composite material will be briefly introduced. The power consumptions of the propeller system and electric parts will be evaluated in a systematic way. Experiments were conducted to verify the theoretical predictions. Flight tests were also performed to study the power consumption of the UAV and the suitability of the proposed procedure for power consumption calculation.
The performance of an acoustic levitator
Authors: Hsu C H , Lin H Y , Agarwal A , Davis I , Nolan K P , Lua K B 
Published: May 2020

Abstract
An acoustic levitator uses an array of ultrasonic transducers to generate a standing acoustic pressure field which exerts a radiation force on small particles, allowing the particles to be trapped, relocated, separated or combined. Experiments on levitating particles of different densities and calculations of the acoustic radiation force and moment have been reported in the literature. However, direct inspection on the acoustic pressure field pattern is seldom carried out. This paper reports an investigation on the performance of an existing acoustic levitator design, which uses off-the-shelf components, by comparing the visualized pressure field from Schlieren imaging to analytical simulations. The ability to compare Schlieren imaging results to analytical simulations readily can prove to be a vital tool. Since the simulations provide an ideal pressure field, the imaging of the levitator pressure field can highlight discrepancies between the real and ideal cases. This can be especially useful as a diagnostic tool to identify the cause of a drop in performance of the acoustic levitator in a real world scenario.
Preliminary study: the use of sugarcane juice to replace white sugar in an effort to overcome diabetes mellitus
Authors: Ayuningtyas R A , Wijayanti C , Hapsari N R P , Sari B F P , Subandi  
Published: May 2020

Abstract
The prevalence of diabetes mellitus, especially type 2 diabetes mellitus, continues to increase. One of the characteristic type 2 diabetes mellitus is insulin resistance, which caused by lack of trivalent chromium. This is occurred because the habits of the people, who consume white sugar more than brown sugar or sugarcane juice. Refining process will eliminate the mineral content in white sugar. Mineral content in white sugar is assumed to be lower than brown sugar or sugarcane juice. Consuming sugarcane juice as a substitute for white sugar is also thought to be able to increase the level of chromium in the body’s cells. It will be publicly accepted in organoleptic. The purpose of this study are to compare the levels of chromium in sugar and sugarcane juice, to know level of chromium in the blood and urine of healthy and diabetes mellitus patients before and after consuming sugarcane juice and to know the level of consumers’ preference to the flavour of white sugar compared to sugarcane juice. Samples of sugarcane juice and white sugar products were obtained from a sugar factory in Java. Determination of chromium content was carried out by dry destruction using Atomic Absorption Spectrophotometer. Organoleptic test was performed using a preference test of 30 untrained respondents. The results had shown that the chromium levels in sugarcane juice were 35 times higher than in white sugar has; sugarcane juice consumption for one month apparently can increase the levels of chromium (both in the blood and in the urine of people) but increased level in diabetes mellitus patients higher than healthy people; and in the terms of the taste, the average respondents’ preferences for sugarcane juice and white sugar is the same. This preliminary study showed that sugarcane juice is potential to overcome diabetes mellitus type 2.
Antibacterial activity of cocoa pod husk phenolic extract against Escherichia coli for food processing
Authors: Diniardi E M , Argo B D , Wibisono Y 
Published: May 2020

Abstract
Cocoa pod husk (CPH) which is a waste of cocoa plantation contains phenolic compounds which can be used as antibacterial agents. Phenolic compounds in CPH include phenolic acids, flavonoids and flavones. The aim of this study was to analyze the antibacterial activity of CPH extract whis was extracted by using Microwave-Assisted Extraction (MAE) method. Extraction using 96% ethanol solvent with a ratio of 1:4, 1:6 and 1:8 (w/v) for 2, 3 and 4 minutes, respectively. The extraction results with the highest total phenolic content were tested their antibacterial activity using a disk diffusion method at an extract concentration of 5, 7.5, 10 mg/mL and 15 mg/mL with three replications, respectively. The highest total phenolic content of 453 mg GAE/g dry extract was obtained from MAE treatment with a solvent ratio of 1:4 (w/v) for 4 minutes. The results of the antibacterial activity of extracts against Escherichia coli showed that inhibitory zones had formed at a concentration of 5 mg/mL. The width of the inhibition zone increases as the concentration of extract increases.
Drying kinetics and physical changes of osmotically pretreated potato (Solanum tuberosum L.) slice
Authors: Hawa L C , Khoirunnida F L , Sumarlan S H 
Published: May 2020

Abstract
Potato (Solanum tuberosum L.) is world’s main crops that owing poor storability characteristic in unprocessed state due to high water content. One of most widely used preservation method for vegetables such as potato is drying process with steam blanching and osmotic dehydration as pretreatment. Blanching and osmotic dehydration pretreatment are used for reducing water content as well as enhance dried product quality by immersing the product into hypertonic solution. In present study, potato slice blanched by steam for 3 min then soaked into three different type of salt as osmotic agent, i.e. NaCl, KCl and CaCl2 with different concentration (10, 15, and 20% (v/v)). The drying process was conducted using hot air dryer at 40°C for 4 h. The results indicated that higher concentration of hypertonic solution give greater water loss and solid gain value. The initial water content of pretreated potato slice was significantly decreased due to osmotic dehydration compared to non pretreated slices. The final potato slice water content with 10% KCl of pretreatment was slightly lower than other pretreatment combination. The drying rate of potato slices with 10 and 20% of CaCl were the lowest rate with almost similar pattern. Pretreatment with 10% CaCl was considered as the most effective pretreatment in terms of better surface color and minimum shrinkage of potato slice. The microscopy image showed that starch granules of potato were spread and invisible due to starch gelatinization. The appearance of cell wall was not clear with less shrinkage of potato microstructure.
The characteristics of corn silk (Zea mays L.) herbal drinks tea with vacuum drying method as antioxidant
Authors: Laeliocattleya R A , Martati E , Alwi A N S , Aulia L P , Yunianta  
Published: May 2020

Abstract
The demand for antioxidant beverages made from herbs in the community increases due to the increasing number of types diseases caused by free radicals. One type of potential herbs as antioxidant is corn silk, in the form of corn silk herbal drinks tea. The basic ingredients for making herbal tea drinks is the dried corn silk. However, the temperature and drying time was found to affect the characteristics of herbal tea drinks produced. The purpose of this study was to determine the effect of temperature and drying time with vacuum drying method on the content of bioactive compounds and antioxidant activity of corn silk herbal tea. This study used Randomized Block Design with 3 replications and 2 Factor. Factor 1 is drying temperature (40°C, 50°C and 60°C) and Factor 2 is drying time (3 hours, 4 hours and 5 hours). Each sample was then analysed the bioactive compounds (total phenolics, flavonoids) and antioxidant activity. The study found that the higher of drying temperature resulted on higher phenolics, flavonoids and antioxidant activity. Conversely, drying time showed a declining trend. The best treatment was found from the combination of drying temperature at 60°C with 4 hours drying time, giving the total phenolics of 11.68 mg GAE/g, flavonoids of 6.47 mg QE/g and antioxidant activity with IC50 values of 278.1 ppm, respectively.