bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Food Marketing Optimization using Analytical Hierarchy Process (AHP)
Authors: Setiadi T , Wasilah  , Tarmuji A , Fadlil A , Noviyanto F
Published: July 2020

At present, the agricultural commodity marketing system in Indonesia is detrimental to farmers. Due to the low selling price due to its dependence on intermediaries. That dependency indicates the difficulty of farmers to obtain data or information related to the market. But now, the government has provided data on the commodity market for the public interest. This research seeks to provide alternative solutions by providing web-based decision support applications that can help farmers get optimum marketing in selling their commodities. The price and market location dataset and market conditions obtain by synchronizing data services for the Food Security & Counseling Agency (BKKP) in Yogyakarta. Application of decision models using AHP produces the best marketing decision recommendations in the form of market location and price, based on the location of the farmer’s house and the condition of the commodity. System usability test results with 30 farmer respondents resulted in an average value of SUS 70.0, and SUPER-Q scored 79%. The application can be accepted by farmers to use.
Analysis Effect of Tournament Selection on Genetic Algorithm Performance in Traveling Salesman Problem (TSP)
Authors: Prayudani S , Hizriadi A , Nababan E B , Suwilo S
Published: July 2020

This study discusses effect of tournament selection on the way individuals compete on the performance of Genetic Algorithms so which one tournament selection is most suitable for the Traveling Salesman Problem (TSP). One algorithm in solving TSP is Genetic Algorithm, which has 3 (three) main operators, namely selection, crossover, and mutation. Selection is one of the main operators in the Genetic Algorithm, where select the best individuals who can survive (the shortest travel route). Tournament selection compares a number of individuals through a match to choose the best individual based on each fitness value, so that the winning individual (the individual going to the next generation) will be chosen. There is two way to compete in an individual in tournament selection is by tournament selection with replacement (TSWR) and without replacement (TSWOR). The final results of the study conducted TSWR gets the best fitness, even though the generation that gets the best fitness is reaching the maximum generation (takes longer to get the best fitness).
Synthesis of organic photoresist of Hibiscus tiliaceus L. flowers for patterning with X-Ray and UV exposure
Authors: Sutikno  , Defi E A
Published: July 2020

Photoresist is an essential chemical used in patterning the microelectronic devices. To ensure the sustainability of the supply of raw materials of microelectronics industry such as photoresist need to look for alternative materials that are more eco-friendly. This study used natural ingredients of Hibiscus tiliaceus L. flowers extract. The manufacture of photoresists carried in four stages, the manufacture of Hibiscus tiliaceus L. flowers extract, the manufacture of thin film Hibiscus tiliaceus L. flowers extract, the manufacture of resist and the manufacture of thin film photoresist. The manufacture of Hibiscus tiliaceus L. flowers extract is done with mass fraction variations using distillation methods. The optical properties of Hibiscus tiliaceus L. flowers extract was characterized using ocean optic Vis-NIR USB 4000. The functional group was characterized using the Perkin Elmer Frontier FT-IR, while the surface structure was characterized using the Digital CCD Microscope MS-804 Scopeman and the electrical properties were characterized using the Elkahfi 100 I-V Meter. The density of the resist is characterized by the mass per volume method. Thin film of photoresist is grown through the spin coating method with a voltage of 10 V for 60 s and heating to a temperature of 200°C for characterization of surface structures and optical properties. Photoresist is tested for sensitivity by giving exposure to UV and X-ray radiation sources to photoresist material. The resulting photoresist has a value of absorbance that is located in the wavelength range of 350 to 1050 nm with a maximum absorbance value of 0.07 to 0.3 at the wavelength of the g-line, h-line and i-line.
Learning outcomes of entropy concept in thermodynamics
Authors: Linuwih S , Rochmawati F , Fianti
Published: July 2020

A short semester was an optional semester for students and the duration was eight weeks including a final exam. This research was conducted to describe student learning outcomes about entropy in thermodynamics. The research was conducted in the thermodynamics class of Physics Department Universitas Negeri Semarang 2018/2019 which was taken by 16 students as the object of this research. The learning outcomes were analyzed from data taken from final exam scores. The data were analyzed by using descriptive qualitative analysis. Based on the result, the score (student learning outcome) was 8,8 on average from the maximum score was 16. It could be concluded that thermodynamics learning outcomes at a short semester program of the entropy concept were in fair category.
Used cooking oil catalytic cracking using Cr-charcoal ion-exchanged catalyst
Authors: Nazarudin  , Ulyarti  , Alfernando O , Fitri S
Published: July 2020

Used cooking oil is the largest waste that can be converted into biofuel as a renewable alternative energy source with catalytic cracking process. In this study, used cooking oil was cracked using a Cr-Carbon catalyst. The charcoal was produced from solid waste (shell) of oil palm industry. Three different chromium concentrations (1, 2, and 3%) were used for the ion-exchange process of Cr-charcoal to produce the catalyst. These catalysts were used for the catalytic cracking of used cooking oil at three levels of temperature (450, 500, and 550°C). X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were used for catalyst characterization. SEM-energy dispersive X-ray spectroscopy (EDX) analysis indicates that Cr was successfully adsorbed into the catalyst. The highest oil fraction was obtained from catalytic cracking of used cooking oil at 450°C using Cr-charcoal catalyst synthesized using 1% Cr solution.
Profile of creative thinking abilities of students measured by multi representation-based creative thinking assessment
Authors: Ellianawati  , Mufiatunnikmah S , Setyaningsih N E , Subali B
Published: July 2020

This study aims to describe the profile of students’ creative thinking abilities. This research is a mixed study using the method of embedded experimental model. Quantitative data in the form of test results become the main data which is then triangulated with qualitative data from collected through classroom observation activities, asking students to fill out questionnaires, and conducting interviews. The subjects of this study are high school students who have studied the topic of linear motion. This topic was chosen because it has a characteristic that is the scope that can be presented with a variety of representations that can reveal students’ creative thinking abilities. The selected school is a state high school with accreditation A with the assumption that students have received education with national standards. This means that it can be a benchmark for the success of a learning program in training students’ creative thinking skills. Based on the results of data collection obtained information that the stimulation to encourage students to solve problems with a variety of display representation is still in the category of less creative. This is supported by field observation data that the one-way learning model, the conclusion of the questionnaire data confirmed from the results of the interview that students lack the opportunity to answer in creative ways.
Habits of mind potency of students of prospective biology teacher
Authors: Ariyati E , Susilo H , Suwono H , Rohman F
Published: July 2020

Habits of mind are a great attitude obtained by the discipline of mind training as habits in action. The action is the consequence of habits of mind that assort cognitive, affective, and psychomotor. Habits of mind are a new trend in education besides high order thinking skills. The purpose of this research is to discover the mind habits potential of Biology students in their first year of college. The method of this research was a survey that involved 67 Biology students in the first year of a university in Pontianak, Indonesia. The data collected by using a questionnaire that contained 44 questions about 16 indicators of mind habits by Costa and Kallick. The data analyzed by using descriptive methods. The findings show that the students’ mind habits are at a sufficient level, and there is no significant difference among 16 categories of habits of mind. Therefore, the freshmen of the Biology Department have good habits of mind potency with the highest percentage is flexibly thinking category (79,60), and the lowest is thinking and communicating with clarity and precision category (63,73). As a suggestion, students’ habits of mind as part of thinking skills need to improve through the learning process.
Mathematical literacy ability of the elementary school teacher education program of the students’ of Universitas Negeri Semarang
Authors: Nugraheni N , Sari EF
Published: July 2020

Mathematical literacy ability is the ability to formulate, apply and interpret mathematics in various contexts. This ability can help someone in applying mathematics to solve problems in daily life. This paper aimed to understand the mathematical literacy ability of the students of The Elementary School Teacher Education Program of Universitas Negeri Semarang. The data analysis was done by referring to the qualitative data model by Miles and Huberman. There are data reduction, data display, and conclusion/verification. The results are 75,57% of the students can formulate daily life problems into mathematical problems, 54,96% of the students have used logical reasoning, 36,64% of the students can draw a conclusion, 29,01% of the students can give an evaluation of the conclusions made.
Using open reasoned Three-tier Test to identify acid-base conceptual understanding of senior high school student
Authors: Susilaningsih E , Nuswowati M , Muttaqiin U F
Published: July 2020

Acid-base is one of the first abstract chemistry course that high school student encounter. Research shows that many students find difficulty on the definition, macroscopic and microscopic conceptual comprehend. This research has the aim to identify the student’s conceptual understanding in acid-base course. The subject for this research is 145 students from government school 2018/2019 school year. The data collected through 16 questions of the three-tier diagnostic test and questionnaire. Three validators validate the question with an average score of 159 from 176. The average score for the questionnaire is 39.75 with good category, and the Alpha Cronbach reliability is 0.714. Analysis of the result shows that the student has several difficulties with acid-base conceptual. Classical result for 145 students are 28% of the student understands the concept, 4% lack of conceptual understanding, 43% misconception and 21% don’t understand the concept of acid-base.
The compost tea on hydroponics system used to increase understanding of Sustainable Development for high school student in Adiwiyata program
Authors: Hartadiyati E , Wiyanto  , Rusilowati A
Published: July 2020

Compost tea is made from compost extracts that contain nutrients needed for plant growth and development. Hydroponics is a planting system that depends on the availability of organic nutrients in the planting medium so that it produces plants that are ready for consumption that are safe and nutritious. This is the basis for providing an understanding of Sustainable Development for high school students in the Adiwiyata program. Adiwiyata is a program that aims to create good conditions for schools to become a place for learning and awareness of school residents (teachers, students, and other workers), to encourage efforts to save the environment and Sustainable Development. The purpose of this study is to increase the understanding of Sustainable Development in high school students in the Adiwiyata program. This study uses one high schools in the Adiwiyata program. Before and after the activity of literacy a hydroponic system using compost tea for safe and nutritious food security and healthy environment, then students were given questions about Sustainable Development. The results showed an increase in understanding of Sustainable Development.
The effectiveness of instructional media based on lectora inspire towards student’s achievement
Authors: Saputro N V , Masturi  , Supriyadi
Published: July 2020

Physics is the most important branch of science, because it contains basic concepts that are also used in other branches of science. In this regard, students need to understand physics well. Instructional media is one way to simplify the process of teaching and learning physics as well as arouse students’ achievement. Instructional media has various forms, one of which is multimedia which is developed using information technology-based applications. Lectora Inspire is a multimedia development application that can be used by all groups. This research aims to find out the effectiveness of the instructional media based on Lectora Inspire on student’s achievement. The method used is a pre-experimental design consisting of four steps, namely identification of needs, design and development, expert validation, and implementation. The implementation is carried out using the one-group pretest-posttest method in the students of class X IPA-2 MA Al-Asror. The instructional media used has a material feasibility level of 84% so that it gets a very decent category, the level of media feasibility given by the media validator is 80% with a feasible category. The normality test from Shapiro-Wilk method shows that the data is stated to be normal, it means the statistic that suitable to test the data is parametric statistis. T-test paired sample as one of the parametric statistics is choosen to get the significance level from the experiment. The result proves that instructional media based on Lectora Inspire is effective to increase students’ achievement.
Constraints of Biology students’ thesis completion
Authors: Ridlo S , Wulandari R , Hadiyanti L N , Setiati N
Published: July 2020

Most students have some problems completing their studies on time. Based on the data of Biology Department of FMIPA UNNES, the average of students from 2012 to 2014 who graduated on time only 20.55%. This study would analyze the factors that become constraints in thesis completion. The research design is quantitative methods with ex-post facto strategies. The research sample is students of the Biology Department of the academic year 2012-2015 taken by simple random sampling technique. The data was collected by a questionnaire and processed using the path analysis by SMART PLS software version 2.0. It is found that motivation, administrative factors, and the guidance process contributed to the process of students’ thesis completion.
Student worksheets based on Science, Technology, Engineering and Mathematics (STEM) to facilitate the development of critical and creative thinking skills
Authors: Yulianti D , Wiyanto  , Rusilowati A , Nugroho S E
Published: July 2020

This study aims to describe STEM-based Student Worksheets, which facilitate the development of critical and creative thinking skills. Another aim is to test the level of readability, feasibility, and describe the improvement of critical and creative thinking skills after the Student Worksheet is applied. This research uses Research and Development (R&D) method as well as one-group pretest-posttest design. As research subjects were ten high schools in the city of Semarang. The results of the feasibility test indicate the criteria are suitable for learning by obtaining an average of 88.96% which means it is very feasible. In addition, the readability test showed that the worksheets were easily understood with an average of 91.66% and an analysis of improvement in critical and creative thinking skills was found to have high average criteria.
Physics experiment activities to stimulate interest in learning physics and reasoning in high school students
Authors: Nugroho S E , Waslam
Published: July 2020

Physics experiments are accompanied by questions that challenge students in learning the topic of the center of gravity which is intended as an alternative solution to foster student interest and reasoning. This research method is classroom action research. Learning is carried out in two cycles in two different identical classes each consisting of 36 students. The improvement in cycle-2 is based on the reflection of learning cycle-1, namely the revision of the use of terms in the student worksheet and the guidelines for carrying out experimental activities to be simpler and more efficient. The implementation in cycle 2 shows that there is no more input from students regarding the unclear work to be done. The results showed that students enjoyed learning (89% cycle-1; 94% cycle-2) and felt more understanding (78% cycle-1; 86% cycle-2), expressing the inspiration they obtained (56% cycle-1; 64% cycle-2). Students stated that they preferred to study the mechanism of physics rather than solving the problem using a formula (58% cycle-1; 94% cycle-2) because they thought it was more useful. The distribution of students’ reasoning scores is better than the ability to solve problems, especially students get a lot of difficulties at the problem identification stage.
The implementation of e-comic earth layer to enhance students’ self-directed learning
Authors: Taufiq M , Wijayanti A , Fajriah E
Published: July 2020

This study aims to analyze the effectiveness of learning media e-comic earth layer to enhance students’ self-directed learning. Method of the research refers to qualitative research approach through qualitative descriptive studies generally are characterized by simultaneous data collection and analysis. The average percentage of Students’ self-directed learning values during four times observations is 86.93% which means that the category is very good. It can be concluded that learning media e-comic earth layer effective to enhance students’ Self-Directed Learning (SDL).
Application of Langrange’s interpolation on analysing flavonoid of tempe
Authors: Asih T S N , Bintari S H , Fitriani M U
Published: July 2020

Interpolation in one of numerical methods to find a value between some data series. Laboratory tests of flavonoid levels in tempe have produced a series of data. These data are pairs of data between isoflavone levels and fat levels, isoflavone levels and protein levels, and also isoflavone levels and carbohydrate levels. However, to analyse the relationship between these data is difficult to do with regression. Lagrange’s interpolation is an alternative method to see the relationship between a series of flavonoid data. From the three data can be generated quadratic equations that describe the relationship of the data. From these equations, we can estimate the level of isoflavone if the fat levels is known, as well as the protein levels and the carbohydrate levels.
Improvement students’ achievement in elementary linear algebra through APOS theory approach
Authors: Arnawa I M , Yerizon  , Nita S
Published: July 2020

This study aimed to improve students’ achievement in elementary linear algebra through APOS theory approach. This study is pre-experimental one-shot case study design. The sample were 32 students who participating in the lecture of chemistry mathematics II academic year 2018/2019 at Andalas University. Instrument used in this study was problem solving test in elementary linear algebra which consisted of four item test that measures the ability to solve daily life problem with system of linear equation, determine determinant of the matrix, determine invers of matrix, and determine eigen value and eigen vector of matrix. Descriptive statistics and t-test with α = 0.05 level of significance were used for data analysis. The results show that: (1) APOS theory approach can improve students’ achievement in elementary linear algebra significantly and (2) there was no a significant gender gap in students’ achievement in elementary linear algebra.
Flying multi agent control for detect an object
Authors: Tjahjana RH
Published: July 2020

This paper exposes two flying vehicles control. The objective of this paper is proposing control design use optimal control approach for flying multi-agent to detect an object. In optimal control approach, beside the dynamical system model, the cost functional is needed. In this paper, the dynamical system model is dynamical system of flying vehicle and the cost functional is the functional which make the vehicles move together to detect the lost object. The scope of this exposition is how to control two flying vehicles move around an object. The two flying vehicles must satisfy the simulation scenarios as follows. Both of the flying vehicles forced do not move far each other and also do not collide each other. Besides mathematical analysis of the model, like controllability and observability of the model, the result of this paper, present the theorem and the proof the cost functional which guarantees that the booth of the vehicles can fly satisfy the scenario. The result also exposes the simulation of controlling two vehicles. The conclusion of this paper states that the optimal control method can be used to solve the problem of control two flying vehicles to detect the lost object.
The dynamics of the basic model for the zika epidemic
Authors: Kharis M , Cahyono A N
Published: July 2020

Zika disease began to get the world spotlight when in 2016 around 1-1.5 million people were infected with the Zika virus in Brazil and 4000 babies were born Microcephaly. Indonesia is a region that is potentially attacked by Zika virus outbreaks. This study discusses the mathematical model for the spread of Zika disease in humans is associated with the population of spreading vectors which in this case are mosquitoes. The model used is a deterministic model in the form of a compartment model in sub-population classes. The purpose of this research is to build a mathematical model, analyze the stability point, and arrange a simulation of a mathematical model.
Challenging students to improve their mathematical creativity in solving multiple solution task on challenge based learning class
Authors: Ardiansyah A S , Asikin M
Published: July 2020

As one of the competencies that must be possessed in the era of Industry 4.0, creativity also plays an important role for development of mathematics education in the 21st era. This study aims to determine the improvement of students’ mathematical creativity in solving Multiple Solution Task (MST) on Challenge Based Learning (CBL) class. The quantitative quasi experimental pretest posttest conducted at SMP Negeri 1 Semarang used a mathematical creativity test adopted MST as a data collection technique and data were analyzed using the t-test hypothesis and gain. The results revealed the improvement of students’ mathematical creativity in solving MST after the implementation of CBL and differences in the improvement of students’ mathematical creativity where the student’s gain of mathematical creativity on CBL (experimental) class was more than the student’s gain of the mathematics of the Problem Based Learning (PBL) (control) class. Other findings indicate a difference in achievement of mathematical creativity indicators between the CBL class and PBL class which shows that CBL provides a positive influence to improve each indicator of mathematical creativity.
Google classroom as a mathematics learning space: potentials and challenges
Authors: Abidin Z , Saputro T M E
Published: July 2020

Information and communication technologies have become a very powerful means of student engagement in an online learning environment. Google Classroom is an easy-to-use educational application that enables teachers to extend their student learning online. With Google Classroom, teachers can create classes, post assignment, grade and send feedback, and see students’ works in real-time. This study aims to investigate the students’ perspectives on their engagement in online learning in Google Classroom. An ethnographic case study was employed to explore and observe student activities in a virtual class in Google Classroom. Questionnaire survey and semi-structured interviews were conducted to understand students’ perceptions of online learning through Google Classroom. The results showed that Google Classroom has good potential to support students’ learning. Students could access the learning resources provided by the teacher at anytime and anywhere. They were also able to construct their knowledge by actively participating in an online discussion forum, and the instructional practices can be performed efficiently. Some challenges that arise included the limited availability of devices, technical issues, and the low level of familiarity of Google Classroom’s features, the readiness of students to study independently online. Although challenges arise, the teacher enabled to deal with the issues well.
The effectiveness of innovative learning model on the mathematical representation ability of students in junior high school
Authors: Wijayanti K , Budhiati R , Dewi (Nino Adhi) N R , Ali A M
Published: July 2020

This study aims to analyze the effectiveness of the Learning Cycle 5E model in developing the mathematical representation ability of Junior High School Students. This study was quantitative. The population was students in Junior High School of grade VIII in Semarang. The sample was taken by a random sampling technique. The data were collected by a test. The data were analyzed by the z-test and t-test. The result showed that (1) students’ mathematical representation ability on the Learning Cycle 5E class achieve classical completeness; (2) the average of mathematical representation ability on the Learning Cycle 5E class was higher than on the PBL class; and (3) the proportion of students’ mathematical representation ability on the Learning Cycle 5E class was higher than on the PBL class. In other words, the Learning Cycle 5E model was effective in developing the mathematical representation ability of Junior High School Students.
Teacher’s belief of mathematical literacy based on local culture: Case study of junior high school mathematics teacher
Authors: Danoebroto S W , Suyata  , Jailani
Published: July 2020

This study was conducted to explain the teacher’s belief of school mathematics subjects in relation to their concepts of mathematical literacy based on local culture. The participants were three mathematics teachers at Junior High School in Java, Indonesia. They were chosen because they met the criteria, namely having at least five years teaching experience, having the awareness to conduct ethnomathematics studies, and teaching mathematics at school using local cultures minimum in one academic year. Research data were collected through interviews, observations during the teaching and learning process, and lesson plans. The data were then analysed using the interactive models of Miles and Huberman. The results of the study showed that mathematics was believed as a tool for solving problems in everyday life, which was related to human and cultural dimensions. The conception of teaching mathematical literacy based on local culture, as according to teacher perceptions, had not placed local culture as an evaluation tool for the development of mathematical literacy. This was because mathematical literacy was not yet believed to be a social construction developed based on mathematical ideas and practices in local culture.
Mathematics creative thinking ability based on student’s cognitive style by using Knisley learning models
Authors: Mulyono  , Rosayanti S M , Kristiawan R
Published: July 2020

The aim of this study was to find out the ievements of students’ creative thinking ability with Knisley’s learning model compared to the Direct Instruction model. This research is mixed methods. The results showed: (1) the mathematical creative thinking ability of students with Knisley’s learning model achieving classical completeness; (2) the proportion of students’ mathematical creative thinking abilities with Knisley’s learning model is better than the Direct Instruction model; (3) the mathematical creative thinking ability of students with Knisley’s mathematics learning model is better than the Direct Instruction mathematics learning model (4) student groups impulsive cognitive style achieve indicators: fluency; or fluency and novelty; student groups reflective cognitive style achieve indicators: fluency and flexibility; or fluency, flexibility and novelty; student groups fast-accurate achieve indicators: fluency, flexibility, and novelty; or fluency, and flexibility; and student groups slow–inaccurate achieve indicators: fluency, or nothing.
Increased mathematical literacy and HOTs through realistic learning assisted by e-schoology
Authors: Wardono  , Mariani S
Published: July 2020

This study aims to determine the development of realistic learning tools (RME) assisted by e-schoology that are valid, practical and know the effectiveness of such learning to improve mathematical literacy and improve higher order thinking skills (HOTs). The population of this research is students of SMPN 9 Semarang. The sample is taken randomly and gets 1 class. The class is given a preliminary test of mathematical literacy and HOTs, then realistic learning is assisted by e-schoology and afterwards a final test is given. The results showed that realistic e-schoology learning developed is valid, practical and there were differences in mathematics literacy skills and HOTs after learning compared to before. Because the mean literacy abilities of mathematics and HOTs after learning are higher than before learning, it can be concluded that realistic learning assisted by e-schoology can increase mathematical literacy and HOTs.
Plasmodium classification on red blood cells image using multiclass support vector machines
Authors: Pradini S F Y O , Bustamam A , Rustam Z
Published: July 2020

Classification methods have been frequently used in various aspects, including bioinformatics. One of it’s purpose of this classification is to determine phase level of a disease. This research will classify the phase of plasmodium falciparum parasite which causes malaria. The disease is spread by an infected female Anopheles mosquito, which contains Plasmodium. The result of this research could be used to determine Plasmodium parasite phase in infected people’s red blood cells. The purpose of this research is to discover the success rate of Multiclass Support Vector Machines method and analyze it in order to predict the parasite phase levels. The data of this study is image data of red blood cells which were infected by three kinds of Plasmodium falciparum parasite levels. In the process, this study will be using Canopy as Integration Development Environments of phyton programming language. From 112 trials, the highest number of accuracy is 87.5% for Multiclass Support Vector Machines one vs rest method which used the 4-fold cross-validation with C=1 as parameter for linear kernel.
Disaster recovery planning with distributed replicated block device in synchronized API systems
Authors: Budiman K , Arini F Y , Sugiharti E
Published: July 2020

System backup can’t be a good solution without planning. Secure data backup planning will prevent more data loss. The Comprehensive Exam is a system to conduct a comprehensive exam and test score management, which is also carried out with the Computer-Based Test. The two systems are connected, these are running with a data-based application programming interface (API) synchronization on two different servers. Two servers running simultaneously with the synchronized API. Special methods of solving this problem are needed to back up supported information systems and computer-based tests. Disaster Recovery is a term for recovery and resumption. A disaster recovery plan is a plan to improve information technology (IT) infrastructure from other disasters that endanger the information infrastructure. One method of recovering business processes is to restore the data backup itself. Data backup is one of the important elements, the data backup method will be applied is the disk mirroring method, which is making a permanent backup from the main data center, data backup will be provided a real-time backup using the Distributed Replicated Block Device (DRBD) concept. In our research concluded automatically synchronizes implementation backup data using the DRBD concept.
Twitter text mining for sentiment analysis on government’s response to forest fires with vader lexicon polarity detection and k-nearest neighbor algorithm
Authors: Mustaqim T , Umam K , Muslim M A
Published: July 2020

Opinions about the government’s response to forest fires have drawn many opinions from the community. One way for people to express their opinions is to use social media Twitter. This study conducted a sentiment analysis process on the government’s response to handling forest fires in Indonesia in 2019 with data sources from Twitter. The analysis was carried out on 6325 datasets written on Twitter on September 20, 2019, and then through the process of pre-processing, automating labeling and classification. The automate labeling process uses a Vader that automatically detects the negative or positive polarity of each data and then goes through the classification process using the KNN algorithm. The test results that were built using rapidminer tools showed an accuracy level of the KNN algorithm of 79.45%, the highest if compared to other classifier algorithms such as decision trees, naïve Bayes and random forests. The sentiment analysis process can almost run automatically without human touch because there is already automated labeling using Vader. Testing sentiment analysis related to the government’s response to forest fires can be analyzed using the KNN algorithm and lexicon polarity detection Vader can be done properly.
Toxicity of essential oils against termite Macrotermes gilvus Hagen (Blattodea: Termitidae)
Authors: Subekti N , Saniaturrohmah
Published: July 2020

Termites are widely known by the public as a pest building. The level of attacks is increasing from year to year. Nowadays, termite control using synthetic pesticides, their use is becoming increasingly uncontrollable that it is very dangerous to human safety. Therefore, the innovative research needed to produce a natural pesticide that is safe for the environment. Research on the use of natural materials as a natural biopesticide control technology innovation that is needed today. Natural materials such as Syzgium aromaticum, Myristica fragran, Cinnamomum osmophleum, Areca catechu has a compound that can be used as a termite control Macrotermes gilvus Hagen. The statistical test data used was a two-way ANOVA test to Determine the effect of essential oils on termite mortality, while to Determine the essential oil that had a significant effect on termite mortality, the Tukey HSD test was used. The purpose of this study was to analyze the active compounds of Syzgium aromaticum, Myristica fragran, Cinnamomum osmophleum, Areca catechu to control subterranean termites gilvus M. Hagen. The conclusions of this study are compounds Syzgium aromaticum, Myristica fragran, Cinnamomum osmophleum, and Areca catechu with a concentration of 10% has the potential to control subterranean termites M. gilvus Hagen.
View of teachers and students understanding’ of the nature of science at elementary schools in Padang city Indonesia
Authors: Satria E , Widodo A
Published: July 2020

This research aims to determine the level of understanding of teachers and elementary students about the nature of science (NOS) in the city of Padang. The type of research conducted is descriptive qualitative by survey method. The sample of this research are 1 teacher and 28 students of grade 5 SD N 08 Padang Besi at Lubuk Kilangan District Padang City, 1 teacher and 28 students of grade V Elementary School Kampung Baru at Lubuk Begalung District Padang City, 3 teachers and 29 students of grade V and VI Elementary School Koto Tuo at Koto Tangah District Padang City, and 3 teachers from Elementary School Lubuk Minturun at Koto Tangah District Padang City. The instrument used in the research is a questionnaire containing 30 statements prepared by researchers, consulting with supervisor, elementary teachers and compiled based on theories from related literature. The result of the research showed that the level of understanding of teacher science in three sub-districts are in Good criteria with average score of 71.58% and the level of science understanding of elementary students in three sub-districts of Padang City is on the criteria Enough with an average value of 64.05%. The Scientific Method aspect of the nature of science is more widely understood by teachers and the Theories and Law aspects of the nature of science are more widely understood by students. In conclusion, the level of understanding of the nature of science of the teachers is higher than the level of understanding of the nature of science of the students and no relationship significant between the two. The implication of this research is the knowledge about the nature of science should begin to be considered and understood by all elements of education so that teachers and students can understand the nature of science very well.
Lead-polyester resin composite as an alternative material for radiation protection in radiography
Authors: Yulianti I , Susilo  , Masturi  , Susanti T , Setiawan R
Published: July 2020

This work presents synthesization and characterization of polyester resin doped with lead acetate (Pb (CH3COO)2) as an alternative material for radiation protection in radiography. Five samples were synthesized with various lead concentration which are 0%, 3.5%, 3.75%, 4% and 4.5%. The samples were characterized using X-ray, He-Ne laser, and FTIR. The results showed that as lead concentration was increased, optical density increased while X-ray transmission decreased. It were found that the attenuation coefficients for each samples were 0.132 cm−1, 0.435 cm−1, 0.543 cm−1, 0.691 cm−1, and 1.156 cm−1. In terms of transmission and attenuation coefficient, lead-polyester composite with lead concentration of 3.5% has an optimum performance.
Moodle as e-learning media in physics class
Authors: Putri R Z , Jumadi  , Ariswan
Published: July 2020

The 21stcentury is characterized by technological developments. This has an impact on all aspects of life including education. At this time, technology is one component in education that cannot be ignored. The purpose of this study was to map the student response to e-learning moodle after using it in class physics. Experimental research model with a one-shot case study designed use in this study. Data collection through a questionnaire at the end of learning. The results show that students have a good response to e-learning, with an average mark of perceived usefulness to e-learning is good, e-learning self-efficacy is good, perceived ease to use to e-learning is good, attitude to e-learning is good, and e-learning system usage is good. To better understand moodle as e-learning in physics study, advantages and obstacles are explained in the discussion.
The profile of student’s problem solving skill using analytical problem solving test (apst) on the topic of thermodynamic
Authors: Putra A A I A , Aminah N S , Marjuki A , Pamungkas Z S
Published: July 2020

This study aims to analyze students problem solving skill in solving analytical problem solving test on the topic of thermodynamics. The research approach used is quantitative with descriptive method. The research subjects were 100 students of senior high school in Ngawi. Instrument test research used analytical problem solving test was modified of national examination test. Instrument test in the form of essay test which measure of 4 indicator problem solving skill by G Polya : (1) Understanding the Problem, (2) Devising plan, (3) Carrying out the plan, (4) Looking Back. The results show that percentage achievement of understanding the problem (58.40%), Devising plan (70.92%), Carrying out the plan (65.52%), looking back (42.88%). It shows that the student problem solving skill of senior high school in Ngawi is still moderate category so it’s necessary to do improvement effort.
The development of interactive learning media with lectora inspire in gas kinetic theory subject to improve the result and students’ interest of the eleventh grade students of senior high school
Authors: Liliana R A , Raharjo W , Jauhari I
Published: July 2020

Education has an important role in the life a nation or a country. It is expected to become the main pillar of the nation in improving the quality of human resources in mastering the various branches of skills and expertise in accordance with the development of science and technology, especially in the field of physics. The use of interactive media that integrated with digital media including electronic combination of text, graphics, video, and sound. The aim of this study is to know the feasibility and the effectiveness of the application of interactive media with Inspire Lectora to increased result and students’ interest of class XI Senior High School. The method used is Research and Development with the development model of DDD-E (Decide, Design, Develop, and Evaluate). The design of this research uses ex-post facto. This developed interactive media is presented and applied by a software named Inspire Lectora, the interactive media development product presented online aided by web. The research subjects are all of the ninth grade science students of Samarinda 6th State Senior High School which is located in Samarinda, East Borneo. Developed interactive media is eligible to be applied in this Senior High School. Developed interactive media is considered to be effective to measure the result improvement and students interest in the subject of the gas kinetic theory.
Analysis of high school students’ science process skills
Authors: Indri O W , Sarwanto  , Nurosyid F
Published: July 2020

This research aims to describe the Science Process Skills of high school students on elasticity material. This research used descriptive methods. The respondents involved in this research were 25 students from XI IPA 2 SMA N 4 Madiun. The instruments used were 10 multiple choice tests and questionnaires for Science Process Skills. Science Process Skills in this research are basic Science Process Skills consisting of 5 aspects of indicators. The indicator aspects of the Science Process Skills in question are observing, concluding, identifying and manipulating variables, predicting and interpreting data. The indicator aspect of Science Process Skills that has the lowest percentage of 30% is the conclude aspect, while the highest skill is the Science Process Skills in the indicatorsaspect of identifying and manipulating variables, and interpreting aspects of data where each indicator has an equal percentage of 50%, for observing indicators have a percentage of 40% and indicators predict by 34%. The results of this study indicate students in SMA Negeri 4 Madiun on material elasticity material have Science Process Skills with an average value of 40.8% which is included in the low category.
Preparation of bioplastic film from gadung starch (discoreahipida) and chitosan plasticized with glycerol
Authors: Hasan M , Afdal D , Nazar M
Published: July 2020

Bioplastic film based on gadung starch (Discoreahispida) and chitosan plasticized by glycerol were prepared through solvent casting method. The aim of the study was to determine the effect of starch and chitosan composition on both mechanical properties and lyophobicity of the films. The results indicated that incorporating the chitosan in the starch matrix induced structural modification due to interaction between hydroxyl functional group and amino group of the starch and chitosan. The films produced in this research exhibit smooth surface, homogeneous and both porosity and cracks were not occurred which was evidenced by Atomic Force Microscopy (AFM) data. The findings also revealed that adding more chitosan in the starch matrix have significantly enhance tensile strength of the film while reduce the extension at break. Films with more chitosan absorbed more water compared to less chitosan film.
The student metacognitive skills and achievement in chemistry learning: correlation study
Authors: Arami M , Wiyarsi A
Published: July 2020

The purpose of this correlation research was to determine the correlation between student metacognitive skills and student achievement. The sample consisted of 180 students grade 10 from all students of class X Senior High School 1 Kasihan. Saturated sampling technique was used to determine the sample used. Metacognitive Awareness Inventory (MAI) quissionaire was used to measure the level of student metacognitive skills. MAI quissionaire consisted of 18 statements with a 5 point Likert scales that ranging from “strongly agree” to “strongly disagree”. The student achievement was measured using the achievement test instruments on ionic bonds and covalent bonds learning. The data were analyzed by using product moment correlation. Result of research indicated that there was very low correlation between metacognitive skills and student achievement. The correlation between student metacognitive skills and student achievement was positive and significant. In other words, if the metacognitive skill is high, then the student achievement are also high.
Analysis of students’ competence in chemistry cognitive test construction based on revised bloom’s taxonomy
Authors: Ramlawati  , Anwar M , Yunus S R , Nuswowati M
Published: July 2020

The test is one of the tools used to measure the cognitive competence of students. The ability to develop tests is one of the competencies teachers and prospective teachers must possess. Revised Bloom’s Taxonomy combines cognitive levels and types of knowledge in constructing cognitive tests. The subject of this study was a postgraduate student in the Chemistry Education Study Program of Makassar State University consisting of 25 people. The purpose of this study was to analyze the students competence in construction of chemistry cognitive tests based on the Revised Bloom’s Taxonomy. This research is quantitative descriptive. Analysis of student competency in developing tests is measured by the test suitability indicators with cognitive levels and types of knowledge. The results of the analysis show that the students competence percentage construction questions level C1, C2, C3, C4, C5, C6 respectively: 98%, 89%, 96%, 89%, 65%, and 60%. The percentage of students competence in tests construction according to the type of knowledge, respectively for the types of factual, conceptual, procedural, and metacognitive knowledge are 84%, 83%, 85%, and 83%. Thus it can be concluded that the student competences in constructing of Chemistry cognitive test based on Revised Bloom’s Taxonomy is in a good category.