bluuebunny/crossref_metadata_2025 huggingface dataset:
Feasibility study on the utilization of mahogany (Swietenia macrophylla King) wood as a raw material in the bio-oil production
Authors: Kadarwati S , Qurrochman T , Kurniawan C , Jumaeri  , Kasmui
Published: July 2020

The liquid fuels from biomass produced through fast pyrolysis is very promising due to their high energy density and carbon neutral properties. Therefore, the pyrolysis of Indonesian mahogany wood at various temperatures (450-600°C) was carried out in this study. A fixed-bed reactor was used in the pyrolysis experiments. The produced bio-oil, bio-char, and gaseous product were recovered and quantified. This study showed that the higher the temperature, the higher the yield of the bio-oil (39.40 wt% at 550°C). However, the pyrolysis at a temperature higher than 550°C produced a lower yield of bio-oil, possibly due to severe cracking resulting in more gaseous products. The produced bio-oils showed good characteristics, i.e. density of c.a. 1,17 g/mL, viscosity of 3.93-5.67 poise, total acid number of 0.66-0.79 mg-KOH/g, and calorific value of 16-18 MJ/kg. The water and volatile (acetic acid, furfural, phenol, and stearic acid) contents of the produced bio-oils were also quantified by using a gas chromatograph. The bio-oils with a low water content (13.46-15.90 wt%) and volatiles (0.1-2.9 wt%) were obtained, indicating high energy density and production of heavy molecules, respectively. The high acid number was likely from the heavy acids that could not be detected by the gas chromatograph.
Synthesis of volcanic ash-based geopolymer with calcium oxide (CaO) addition for building material application
Authors: Kusumastuti E , Ariati F I , Atmaja L
Published: July 2020

Volcanic ash is a natural pozzolanic material with high mol ratio SiO2/Al2O3 but low in CaO. This research aims to study the volcanic ash geopolymer characteristics related to CaO addition. Geopolymers are prepared by mixing volcanic ash, alkali activator solution, sodium silicate, and calcium oxide. Calcium oxide added varies 5–135 g with each interval is 5 g in Solid/Liquid (S/L=1.83) ratio. Geopolymer characteristics investigated include setting time, compressive strength, resistance to sulfuric acid and mineral phase. The results showed that the more CaO was added, the shorter the setting time and the greater the compressive strength until it reached optimum. The amount of optimum CaO that added is 30 g, with the setting time 2.61 hours and the compressive strength 36.26 MP better than the volcanic ash geopolymer without CaO as 103 hours in setting time and 20.34 in compressive strength. Volcanic ash-based geopolymer at the optimum CaO addition proved to be better than cement mortar, which has a shorter setting time, greater compressive strength and greater resistance to sulfuric acid. Mineral phase analysis by XRD shows that the optimum geopolymer containing an amorphous phase with a major mineral is quartz and sodalite.
Proximate analysis of soybean and red beans cookies according to the Indonesian National Standard
Authors: Eden W T , Rumambarsari C O
Published: July 2020

Proximate analysis is a chemical analysis method to identify the food content of an ingredient. The proximate analysis component (protein, ash, fat, water and carbohydrate) correlate with the nutrition value of food. Many kinds of cookies were sold in the market but the data of proximate analysis results related with food quality is scarce. Three samples of cookies (one sample of soybean cookies and two of red bean cookies) that are available in Indonesian market were assessed in this study. Soybean cookie (sample no.387) was in accordance with Indonesian National Standard (INS) in terms of ash content and fat content. Red bean cookies (samples no. 388 and 389) met the INS requirements of protein and fat content. Whereas, all cookies samples were not INS compliant in terms of moisture content and carbohydrate levels (maximum 5% and minimum 70%, respectively).
Catalytic cracking of polyethylene terephthalate (PET) plastic waste and palm fibre mixtures using Ni-USY zeolite catalyst
Authors: Nazarudin  , Jayanti N , Alfernando O , Prabasari I G , Ulyarti  , Sarip R
Published: July 2020

This research was carried out to produce fuel (Oil Liquid Poduct/OLP) from catalytic cracking of a mixture of Polyethylene Terephthalate (PET) and fiber waste from palm oil. USY zeolite was previously ion-exchanged by three levels of Ni-metal concentration (1%, 2%, 3%) before used as catalyst in the cacking process. The catalytic cracking was carried out at rasio of sample to catalyst was 6:1, three levels of temperature (400°C, 425°C and 450°C) and three levels of reaction time (10, 20 and 30 minutes).The SEM images and EDX spectra of Ni-USY zeolite catalysts showed that all catalysts were in crystalline form of FAU framework. The highest of OLP percentage, 24.5%, was produced by catalytic cracking at 450°C for 10 minutes using Ni-USY prepared by ion-exchange using 2% concentration of Nickel Nitrate solution.
Polymeric and non-polymeric nanofiber of Cinnamaldehyde from Cinnamon oil (Cinnamomum zeylanicum)
Authors: Moreta S , Cahyono E , Affandi N D N , Fadil F , Kurniawan C
Published: July 2020

Encapsulation of cinnamaldehyde within polymeric and non-polymeric-based nanofiber matrix was investigated. Polyvinyl alcohol (PVA) was used as a polymeric matrix, and β-cyclodextrin (CD) was used as a non-polymeric matrix. The study is aimed to purify cinnamaldehyde from cinnamon oil and to encapsulate it within the nanofibers matrix. The purification step was carried out using spinning band distillation. On the other hand, the nanofibers were prepared through electrospinning. Three different formula were made, namely PVA/cinnamaldehyde, PVA/β-CD/cinnamaldehyde 5% and PVA/β-CD/cinnamaldehyde 10%. The yield of isolated cinnamon oil was 0.26% with 88.90% cinnamaldehyde purity in fraction III tested using GC and GC-MS. In advanced, the SEM images indicate that the average diameter of the bare nanofiber matrix was 75 nm. The diameter was decreased in the presence of cinnamon oils in all samples (range 50-65 nm). The inclusion complex formation was confirmed from FTIR data in the presence of a band at 1700 cm-1 that indicate the presence of the aldehyde group in both polymeric and non-polymeric nanofibers matrix.
Problem solving skills improvement and the impact on students’ learning outcomes: learning based e-project
Authors: Harefa N , Purba L S L
Published: July 2020

Problem solving skills have important role on process science skills. These skills are part of 21stcentury priority skills in Indonesia. This study aims to analyze the impact of learning based e-project on problem solving skills. This study employed methods a nonequivalent control group design. The subject of this research are students’ of class XI MIPA 1 as class of experiment 1 and XI MIPA 2 as class of experiment 2 of SMA Yadika 9 Bintara, Bekasi, West Java with purposive sampling technique. Experiment class received treatment used e-project based learning. Experiment classes are giving the e-project to improve problem solving skills and control classes are learned conventionally. Data was collected through pretest and posttest results from students’ in both classes. A t-test was used and it is found that level of significance is 0.006 (sig. < 0.05) proving that e-project based learning is effective to improve students’ problem solving skills.
The effectiveness of nature-based practicum worksheet on acid-base titration material towards students’ science process skills
Authors: Nuswowati M , Azzahra A , Purwanti E
Published: July 2020

The study aimed to find out the eligibility, effectiveness, and practicality of Nature-Based Student Practicum Worksheet on Acid-Base Titration towards students’ Science Process Skills. Research and Development method was used in this study. The research was conducted at SMAN 1 Kendal. The result of the validation assessment showed that the developed worksheet was eligible, with an average score, given by the validators, was 89.58% for its materials and 90.28% for its media. The analysis result of the students’ science process skills in performing practicum activities showed that 60 students reached a “very good” category and 9 students reached a “good” category; and the result of evaluation test revealed that 62 out of 69 students passed the minimum passing criteria (≥75). The reliability of the questionnaire for the students’ responses was also tested; and it was revealed that its reliability was 0.89. According to the validation stage, the test results on a small and a large scale showed that the nature-based practicum worksheet on acid-base titration material towards students’ science process skills was eligible, effective, and practical to be implemented.
Skills to argue: using argument-based learning (AbL) and socio-scientific issues to promote university students’ argumentation skills in chemistry
Authors: Effendi-Hasibuan MH , Bakar A , Harizon
Published: July 2020

Skills in making scientific argumentations are crucial for students to understand science concepts. This study had used an argument-based learning (AbL) adopting Toulmin’s Argumentation Pattern (TAP) and socio-scientific issues about heavy metals to promote the argumentation skills of the Indonesian university chemistry students. The effect of AbL in promoting the skills had been compared to Jigsaw and two-stay-two-stray (TSTS) learning that had been used in an earlier study. Data were collected using open-ended tests and observations. Quantitative and qualitative methods were employed to analyze the data. The results showed that the argumentation scale of the AbL-students was better than and significantly-different from the argumentation scale of those in the other classes (Tukey-test;p<.05). Distinct opportunities the students had in each class to use the TAP was the factor that produced the scale differences. The results recommend the importance of involving students in a learning that mostly promotes argumentation activities-like the AbL-to develop the students’ argumentation skills in science.
Assessing secondary level students’ critical thinking skills: inspiring environmental education for achieving sustainable development goals
Authors: Uddin M R , Shimizu K , Widiyatmoko A
Published: July 2020

The study intends to measure secondary level students’ critical thinking skills. This study follows a survey method and is a part of a doctoral dissertation focusing on promoting critical thinking skills of environmental education for achieving sustainable development goals (SDGs). The data were collected by using the Critical Thinking Skills test on Environmental Education (CTSEE) comprises of 27 items. The participants were the 8th grade students (N=444) from 13 secondary schools that cover four administrative districts of Bangladesh. The Instrument was adopted from previous research that consists of three aspects (Conclusion, Inference, and Identifying Bias) of critical thinking skills. The result shows that the students’ critical thinking skills on environmental issues can be categorized into the poor and very poor category, and there are statistically significant differences between male and female students. The study will be used as the reference for developing students’ critical thinking skills about the surrounding environment-related problem in line with achieving the globally decided environmental sustainability as well as sustainable development goals.
Scientific creativity: a literature review
Authors: Wiyanto  , Saptono S , Hidayah I
Published: July 2020

Much research has been done on creativity and the results can be easily found in journals, however, research on scientific creativity as a domain-specific creativity is still relatively rare. Therefore, it is necessary to study the literature to reveal the scope of research on the topic of scientific creativity. To achieve this aim, a literature review was carried out with the procedure adopted from the PRISMA statement. A total of 49 articles obtained from the IJSE, DOAJ, ERIC, IOP Science, ScienceDirect, and Springer Link websites, in the 2001-2019 period, were analyzed. The results showed that the three journals that published the most scientific creativity articles were JEP, IJSE, and CRJ. And, the three countries with the most contributing authors were Turkey, Indonesia, and Taiwan. Except for one critical review article, the research types of all articles analyzed were an empirical study, which consisted of at least five sub-topics of scientific creativity.
The analysis of ethnoscience-based science literacy and character development using guided inquiry model
Authors: Sarwi  , Alim  , Fathonah S , Subali B
Published: July 2020

Building science literacy education in the 21st century began to be developed again especially in primary schools. The purpose of the research was to analyze of ethnoscience-carica based of science literacy and character development by using guided inquiry model. The place of research is at two state primary schools in Wonosobo Regency, Central Java. The mixed methods research was used, with embedded experimental model design. The subjects research are 56 students from primary school. Data collection was done by using test, observation, and documentation. The result showed the positive correlation between the mastery of science literacy an ethnoscience-carica based on the healthy food and students’ character is r = 0.58 (medium); and gain factor  = 0.70 (high). The conclusion of the research that the implementation of the guided inquiry model is to effective increase students’ mastery of scientific literacy on the healthy food and students’ character development.
Measurement of critical thinking skills in project-based chemical analysis instrumentation experiments
Authors: Prasetya A T , Cahyono E , Sudarmin  , Haryani S
Published: July 2020

The study aims to apply project-based learning through the application of laboratory quality to improve basic laboratory skills, instrumentation analysis skills, and critical thinking skills to solve problems. In the preliminary experiment, authentic assessment is used to measure the level of basic laboratory skills and instrumentation analysis skills. In project work with the application of laboratory quality procedures, authentic assessment is used to measure critical thinking skills. There are 99% who have a high and very high level of basic laboratory skills. The achievement level of instrumentation analysis skills with high and very high criteria for pH-meter instruments, conductometers, and spectrophotometers in sequence 94, 85, and 83%. Instrumentation analysis skills for UV-Vis spectrophotometers are the most difficult to master by students then followed by a conductometer, and a pH-meter. The project work design must implement laboratory quality procedures which include how to take samples, manufacture working solutions, prepare samples, make calibration curves, sample measurements, calculate and analyze data, and test validation methods. Method validation testing activities include linearity testing, LoD and LoQ calculations, precision and accuracy tests. There are 63% have a high level of critical thinking skills, and there are no very high criteria.
Creative thinking skills profile of junior high school students in science learning
Authors: Nurdiana H , Sajidan  , Maridi
Published: July 2020

The era of the industrial revolution 4.0 in the 21stcentury demands people to develop skills in all sectors of life, including education and learning. One of the elements that supports learning is student creativity. In Science learning, creativity becomes an imperative aspect of learning Science in schools. This study aims to analyze the level of creativity of 7th-grade students at SMP Negeri 8 Surakarta. The type of this research is descriptive research. The subjects of this research consisted of 263 students who were obtained from 8 classes. The instrument used in this study was a instrument test of the creative thinking skills consisting of eight questions. There are four aspects of creative thinking skill namly fluency, flexibility, originality, and elaboration. The results of the percentage analysis of each aspect showed that the fluency was 47% and it was categorized as the moderate category. Meanwhile, the other three aspects were categorized as the low category in which the flexibility was 26.94%, the originality was 21.24%, and the elaboration was 29.77%.
The utilization of video animation media for improving students’ understanding of biotechnology subject on lipaseenzyme production through genetic engineer technique
Authors: Furqan B R N , Yamin I S , Qomaliyah E N
Published: July 2020

The introduction of Biotechnology subject started in SMP (9) and deepen in SMA (12). One of the topics on modern biotechnology products is Genetic Engineering technique to produce lipase enzymes. SMA student knowledge on this topics are still limited since the source of information used by teacher on learning process is generally based on the textbook and delivered through leatoring method. The use of learning media with virtual-technology based is expected to provide an illustration of information that make easier and more attractive to understand. In this study, two mediums were evaluated, including textual and video animation media. To test the superiority of video animation media, the test is carried out to SMA students in Lombok, by using same questions about student undestanding level between video animation and textual media. The evaluation shows that video animation improve the average outcomes, informative, attractive, and easy to understand. This feasability tests carried out by Biology teachers and student’s responses. Therefore, video animation media can be used as Biotechnology learning media.
Application pineapple liquid waste to increase fruit weight and vitamin c pineapple as biological learning resources
Authors: Sidik B R , Achyani  , Sutanto A , Zen S , Noor R
Published: July 2020

Pineapple Liquid Waste (PLW) is waste that has acidity characteristics and contains organic material which can be utilized as a substrate for bacterial growth. Researchers are trying to provide the latest breakthroughs to utilize Pineapple Waste (PLW) as organic fertilizer to reduce waste increases and increase agricultural yields. The purpose of this research is to find out the effect on the weight of pineapple and find out whether it will increase vitamin C levels in pineapple. This study used an Experimental Method, the design of the design used was a Complete Random Design Variety and analyzed using a multivariate test. the conclusion of this study is the variation of PLW has a significant effect on fruit weight p> 0.05 and on vitamin C levels p < 0.05, so that no significant effect on fruit weight and significant effect on increasing levels of vitamin C, so this research can potentially design learning resources for biology.
Handling governance of out of school children in Parereja village in supporting back to school movement
Authors: Hidayah I , Latiana L , Widowati  , Tatirah
Published: July 2020

The large number of out-of-school children in Brebes district is handled by Back to School Movement (GKB) program. The program is implemented as a participation program for all stakeholders, district government, regional education organization, school principals, village heads, community organizations, and other society elements. How is Parereja village’s role in supporting GKB program? This study is a case study, which researchers were as instruments and directly involved in the respondents’ activities. The role of Parereja village in succeeding GKB was indicated by the description of series of activities in preparing it returning out of school children in their areas. Under the coordination of village head, Education Care Community Forum (FMPP) was having collaboration with existing community organizations. The series of activities included verifying and validating data for out-of-school children, continuing advocacy to out-of-school children and their families carried out by children’s forum with a peer approach. In conclusion, the role of Parereja village with village FMPP together with partners was the key to the success of GKB program in Brebes district. Out-of-school children of Parereja village that joined PKBM were more than in formal schools. There were 76% successive additions and 35% from the previous year.
Biology student’s Understanding of Nature of Science (NOS) and metacognitive awareness at higher education
Authors: Sukaesih S , Zubaidah S , Mahanal S , Listyorini D
Published: July 2020

The nature of science (NOS) is a crucial aspect of scientific literacy and also a major goal in science education. To achieve science education goal, students’ knowledge and metacognition are highly required. This study described Biology student’s understanding of NOS and their metacognition at higher education. This study was a survey of semester-four students. Data on NOS was from the Views of Nature of Science (VNOS) questionnaire form B, and students’ metacognition data was from the Metacognitive Awareness Inventory (MAI) questionnaire. Data were analyzed descriptively. The results showed that the average of biology students’ NOS understanding is 60.35%. Based on seven aspects of NOS understanding studied, the highest achievement is in the empirical-based science aspect (68.69%), the lowest performance is in the subjective science aspect which is full of theoretical content (49.49%). Students’ Metacognitive regulation has a lower average (77.4%) than metacognitive knowledge (81.33%). It is found that Biology student’s NOS understanding is still weak, and their metacognition still needs to be fixed. This research suggests that biology student’s NOS understanding and metacognitive awareness still needs to be upgraded through the learning process so that students would be scientifically-literate and successful in their higher education.
Teacher’s Perception of Science Practices Learning (SPL)
Authors: Winarto  , Noviandini D , Marwoto P , Wiyanto  , Rido S , Iswari R S , Priyambodo P
Published: July 2020

The purpose of this study was to determine (a) developing survey instruments for Teacher’s Perception of Science Practices Learning (SPL) and (b) describing the perception of science learning practices. This research uses descriptive survey method. Respondents in this study were elementary school, junior high school and high school science teachers in the Central Java region, totals 74 teachers. The research instrument used was a science learning practice perception questionnaire. The instrument has gone through the stages of expert validation and empirical testing. The instrument validity uses exploratory factor analysis. Data analysed by descriptive. The research results that the perception of science teachers on SPL is not different. Elementary, middle and high school science teachers have enough categories. El dimension, EE, SDC elementary, middle and high school science teachers have enough categories. The dimensions of the EPK for elementary science teachers have enough categories, middle and high school science teachers are in good category. The dimensions of IT in elementary, middle and high school science teachers are good. Science teachers’ perceptions of SPL are in the enough category.
The analysis of article citation in science education journals
Authors: Parmin  , Savitri E N , Amalia A V , Nadia I
Published: July 2020

This research intends to analysing the citation of articles that have published in science education journals indexed by SINTA (Science and Technology Index). The research objects were 19 journals that rated Sinta 1 to 6. The articles were analysed descriptive-qualitatively through Google Scholar. There were six aspects of analysis including (1) number of citations; (2) average citation; (3) the most-cited article; (4) the least-cited article; (5) the most-cited theme; and (6) the least-cited theme. The analysis revealed that the highest citation was articles published in Jurnal Pendidikan IPA Indonesia with a total citation of 2,679 from 2012 to 2019. The lowest number of citations was in Spectra: Jurnal Kajian Pendidikan Science, for having nine citations within two years. The most-cited article reached 178 citations. However, most of the published articles have not been cited yet. Moreover, the most-cited theme was a science learning strategy. In conclusion, the articles published in journals of science education were in a low category because the average of articles citing is less than 10.
Fostering students’ scientific literacy and communication through the development of collaborative-guided inquiry handbook of green chemistry experiments
Authors: Hardianti R D , Wusqo I U
Published: July 2020

Industrial revolution 4.0 requires a person to be literate, as well as science students who have to achieve science literacy through experimental activity. The aim of this research is to develop a collaborative-guided inquiry handbook based on green chemistry vision for general chemistry experiment to promote the students’ scientific literacy and communication skills. Preliminary observation found that in general, students faced difficulty to relate chemistry concepts to the experiment they had done through expository model. As a result, they were unable to modify procedures, variables, and chemicals needed to meet green chemistry principles. Developing a collaborative-guided inquiry handbook based on green chemistry vision is expected to cope with the problems as mentioned. This research implemented Borg and Gall’s research and development method excluded dissemination phase. Validation from two experts were very valid for the handbook (92,85%), communication skill assessment (94,32%), reflective journal (93,75), and questionnaire (96,88%). The development was also effective because questionnaire performed that more than half of students attained science literacy standard (69,23%) and the vast majority of students (93,7%) agreed that guided experiment laboratory model based on green chemistry vision is useful and they want to apply it for next laboratory activities.
Content Validity Analysis of Ethnoscience-based Interview Worksheets in Bukit Ajimut for Medicinal Plants Pharmacognosy Learning
Authors: Rinto  , Hayati N , Wiyanto  , Ridho S
Published: July 2020

This research is aimed to provide Interview worksheets for Vocational School of Pharmacy Students which have content validity with ethnoscience content so students experience directly how to gain information about medicinal plants used locally as inherited knowledge. Interview worksheets are a form of learning media that can support 21st century skill inside students. Interview worksheets have to be developed with various interview techniques and need a content validity test in order to be used to reach learning goals. The validity of interview worksheets through content validity must be conducted by experts in science learning field. This content validity is done quantitatively by experts by using Aiken’s V. This scoring of interview questions is employed to 26 interview questions with the minimum score is 1 and the maximum score is 5 by 9 validators whose expertise in science learning. Score V gained by using Aiken formula from each question compared to Aiken’s content validity table with significance level 5% to decide point validity. Data analysis of interview questions show 15 valid questions of 26 in designed worksheet instruments. The result of Alpha Cronbach’s reliability test is 0.99 which means that the reliability level is very strong.
Concept map and problem-based learning
Authors: Fitrianingsih F , Widoretno S , Probosari R M , Dwiastuti S , Sajidan
Published: July 2020

The research aims to calculate the increase of student’s Concept Map (CM) scores through the implementation of Problem-Based Learning (PBL). The research is a classroom action. Research procedures include planning, observation, implementation, and reflection. The subjects were 34 X grade students. The data were collected by observation, assessment, interviews, and documentation. CM scores were calculated as a percentage based on expert CM. The research data consisted of the percentage of students’ CM scores, performance assessment, the implementation of PBL syntax, interviews, and documentation of the learning process. The validity test used data triangulation. The analysis techniques are through reduction, data presentation, and drawing conclusions. The results show that the percentage of CM scores in the pre-cycle, cycle I, and cycle II, respectively have a range of values of 4.62-20.80%; 11.56-24.25%; and 12.14-30.86% with an average increase in the first cycle is 10.96%, and the second cycle is 4.06%. The increase in the average percentage of CM score is supported by the linear increase in the average components of H, P, B, and E, thus the application of PBL is able to increase the percentage of CM scores based on the linear increase in the average components of H, P, B, and E.
Developing critical thinking skills assessment for pre-service elementary school teacher about the basic concept of science: validity and reliability
Authors: Patonah S , Rahardjo S B , Cari  , Sajidan
Published: July 2020

One of learning outcomes in higher education is the ability to apply logical, innovative, and critical thinking in the science and technology learning. But the instruments to measure it are still few, so this study was aimed to develop critical thinking skills instruments for elementary school pre-service teachers. The mixed-method was used in this research. It consisted of 3 stages, namely, 1) the initial study, 2) design and review, and 3) try out. 122 students were selected as samples. The instrument consisted of 20 items about the Basic Science Concept Development. The items developed according to the indicators of critical thinking skills by Facione. The results showed that all items have a fit in the range of 0.77 - 1.20; mean INFIT MNSQ of 0.99, SD of 0.11; and internal consistency of 0.58. Overall, all items were declared valid and reliable.
The influence of science learning media based digital storytelling towards metacognition ability
Authors: Dewi N R , Nurkhalisa S , Savitri E N , Dwijayanti I , Wibowo S W A
Published: July 2020

Implementation of learning should provides opportunities for students to be able to develop metacognition ability. This study aimed to analyze the influence of Science Digital Storytelling media towards metacognition abilities of students. The study design used is Nonequivalent-Groups pretest-posttest control group. Samples selection are done by random sampling. This study had found that the metacognitive ability of students which consists of five levels of metacognition ability increases. N-gain is at the low category of the control class and was the experimental class. Relations Science Digital Storytelling calculations have been done and the r value obtained is 0, 85 which means that there is a strong relationship between Science Digital Storytelling to metacognition abilities of learners. The test results of the influence of media Science Digital Storytelling is obtained that sig-2 tailed 0.00 <0.05, it can be concluded that the media Science Digital Storytelling has a significant impact on metacognition ability.
The development of authentic scientific inquiry assessment to measure the laboratory skills
Authors: Huda S , Hartono  , Masturi
Published: July 2020

Assessment in learning is an important aspect to analyze the learning progress. Nowadays, the assessment runs a shifted paradigm from measuring in higher-order thinking aspects to performance assessment. This study aims to develop an assessment instrument based Authentic Scienti_c Inquiry Assessment (ASIA) in measuring the laboratory skills. The laboratory skills consist of_ve skills categories, they are safety skills in the laboratory, experiment management, measuring skills, collecting data, and interpreting skills. From those skills, we derive 20 aspects. We used 4D methods in developing the instruments, define, design, develop, and disseminate. The results of construct validation and content show that the instrument is valid and reliable. We perform the effectivity test and gain the tcount = 25281; ttable = 1,708 with significance level less than 0,05. We also perform a questionnaire for the lecturers and laboratory assistant that shows 85% positive response, 11% of negative response, and 4% of abstance. We can conclude that our instrument is effective to measure the laboratory skills.
On total edge and total vertex irregularity strength of pentagon cactus chain graph with pendant vertices
Authors: Rosyida I , Ningrum E , Setyaningrum A , Mulyono
Published: July 2020

Let G(V, E) be a graph with a non-empty set of vertices V and a set of edges E. A total k-labeling f: V ∪ E → {1,2, …, k} is called an edge irregular total k-labeling if the weight of each edge is distinct, where the weight of an edge e = xy is wt(e) = f(xy) + f(x) + f(y). Whereas, f is a vertex irregular total k-labeling if the weight wt(x) ≠ wt(y) for two distinct vertices x, y of V(G) where the weight wt(x) = f(x) + ∑
υx∈E(G)
f(υx).

The minimum k for which G has an edge irregular total k-labeling is called the total edge irregularity strength (tes) of G. Further, the total vertex irregularity strength (tvs) of G is the minimum k for which G has a vertex irregular total k-labeling. In this paper, we find tes and tvs of heptagon cactus chain graph with pendants and get the results as follows: tes

(
C

(
P

t

r

3

)

)

=

⌈

8
r
+
2

3

⌉

and tvs

(
C

(
P

t

r

3

)

)

=

⌈

6
r
+
3

4

⌉

.
The convergence analysis in Central Java Province (an approach for unconditional and conditional)
Authors: Subanti S , Hakim A R , Rahman A , Aditya C , Pratama R A
Published: July 2020

The aims of this paper wants to analyse the development convergence between regions in Central Java Province. We used the annual data from 2010 until 2016. The regression result show that the absolute convergence have negative sign, it indicate that the poor region could grow faster that the rich region. In other words, there is a possibility of convergence between regions in Central Java Province. From our results, we calculate the speed of convergence among this period, the value amount of 0.007 and 1.053 percent per year, with the implication of the half of life convergence is 66 - 95 years. We suggest that the provincial government of Central Java can prioritize the development programs with focusing on the under-developed regency. This program hoped to reduce income disparities then it will be one of the efforts to reach convergence amongst cities / regencies in Central Java Province.
Deep convolutional neural networks for the detection of macular diseases from optical coherence tomography images
Authors: Kharisudin I , Az-Zahra M F , Winarti E R , Waluya S B
Published: July 2020

The purpose of this research is to design a system to recognize CNV image, DME, Drusen, and Normal, which were produced by Optical Coherence Tomography (OCT). A system would provide a training model, evaluation, and accuracy value. We used the Convolution Neural Network method with default parameter 50 epoch, one stride, 83484 train data images, and learning rate value 0.001 with the help of Python 3.7 software. The examination using epoch variation, stride, number of train data, and learning rate value resulted in different accuracy values. According to epoch variation, the best accuracy was 50 epoch with an accuracy value of 0.99 and loss validation of 0.2034. The best accuracy of stride value variation was one stride with an accuracy value of 0.99 and loss validation of 0.2267. The best accuracy of train data variation was 83484 images with an accuracy value of 0.99 and a loss validation value of 0.2524. The learning rate variation value with the best accuracy was 0.0001, with an accuracy value of 0.992 and validation loss value of 0.2524. According to the result of the research, it was obtained that convolution neural network architecture gain the best model with accuracy value 0.992 according to variation parameter 50 epoch, one stride, 83484 train data images, and learning rate 0.0001.
Stackelberg scheme in vendor – buyer inventory model for imperfect quality product with partial backordering
Authors: Setiawan R , Chrisnawati H E
Published: July 2020

In this paper, several new mathematical analysis approaches in probabilistic inventory model which incorporate both imperfect quality items existence and lead-free demands are proposed using non-cooperative games. Considered the monopolistic relationship between vendor and buyer in some real inventory problem, the vendor is set to be a leader who determines the Stackelberg’s optimal move after observing the optimal responses from the buyer as a follower. Optimum condition using Karush – Khun – Tucker conditions is applied with Stackelberg scheme to get optimum value of the system.
An application of Interregional effect on Central Java province economy (interregional input output approach)
Authors: Subanti S , Hakim A R , Riani A L , Hakim I M , Irawan B R M B
Published: July 2020

The changes in the structure of the Indonesian economy not only affect the interregional linkages but also the intersectoral linkages, no exception the Central Java Province. This paper aims to calculate and to interpret the interregional effect, especially Central Java Province, to the main island in Indonesia. Using the Interregional Input - Output data for 2005. The study found that the sectors that provide the greatest interregional effect as follows (1) the electricity gas water sector for Central Java and other provinces in Java Islands; (2) the air transport sector for Central Java and Sumatra Islands; (3) the water transport sector for Central Java and Kalimantan, also Central Java and Bali, West Nusa Tenggara and East Nusa Tenggara; (4) oil refining industry sector for Central Java and Sulawesi; (5) animal husbandry and other products sector for Central Java and Maluku - North Maluku - Papua.
Analysis of global stability of HIV/AIDS epidemic model in homogeneous community
Authors: Sutimin  , Khabibah S , Munawwaroh D A , Soelistyo R H , Henindya A
Published: July 2020

A model of HIV/AIDS epidemic in homogenous community is proposed and analyzed the global dynamic. The model is studied to investigate the existence of equilibria and analyze the global stability. The global dynamic is determined by the basic reproduction ratio that is obtained from the next generation matrix of the model. The endemic equilibrium point is globally asymptotically stable when this ratio exceeds unity, while the disease free equilibrium achieves the global stability when the ratio is less than unity. The simulation results are presented to simulate the evolution of population in the long term
Probabilistic quadratic programming model for Sewon-Bantul facultative ponds optimization
Authors: Sunarsih  , Sutrisno
Published: July 2020

This article is addressed to show the result of a probabilistic mathematical model implementation in Sewon, Bantul facultative wastewater treatment pond to analyse the performance of the pond. The model was developed in a probabilistic quadratic optimization model and was solved by using probabilistic programming by using deterministic equivalent approach. LINGO 18.0 optimization software package was employed to do the computation. The optimization result was giving the optimal decision value for the wastewater volume that should be processed in the pond in order to gain the best performance and the storing time of the wastewater for each facultative pond. For each facultative pond, the load volume of the wastewater should be 1199.5 kg where the storing time is 13.2 day for the first pond, 13.24 day for the second pond, 25.59 day for the third pond and 30.30 day for the fourth pond. This optimal decision, then, can be used by the decision maker (WWTP operator) in order to optimize the performance of the treatment ponds.
Didactical design of Sundanese ethnomathematics learning with Endog-endogan and Engklek games in primary school
Authors: Supriadi S , Arisetyawan A
Published: July 2020

This article aims at optimizing Sundanese ethnomatematics learning by improving the modeling and creative thinking abilities of primary school students using teaching materials developed with the Didactic Design Research method. The research subjects involved were first-grade and second-grade students of an Islamic primary school in the city of Serang, Banten with a total of 283 students. The data were obtained using learning obstacles test instrument, Initial Didactic Design and Revised Initial Didactic Design as the instruments. The results of the study show that learning barriers were experienced in the materials of addition and subtraction of numbers. The Initial Didactic Design was revised and developed using Sundanese ethnomathematics learning using endog-endogan and engklek games that resulted in the improvement of primary students’ creative thinking, geometry thinking, and algebra.
Student error analysis in global meta-level algebraic thinking on treffinger learning assisted by scaffolding
Authors: Agoestanto A , Rinachyuan W
Published: July 2020

This study aims to: (1) find out the quality of Treffinger learning assisted by scaffolding; (2) find out whether students’ abilities in global meta-level algebraic thinking in Treffinger learning assisted by scaffolding reached minimal completeness criteria score; (3) describe the types and causes of student errors in global meta-level algebraic thinking; (4) describe the types of scaffolding that could minimize student errors in global meta-level algebraic thinking. This study used a mixed-method. The results showed that: (1) the quality of Treffinger learning assisted by scaffolding was very good; (2) students’ abilities in global meta-level algebraic thinking on Treffinger learning assisted by scaffolding reached minimal completeness criteria score; (3) upper group students tended to make comprehension errors, middle group students tended to make comprehension and process skills errors, lower group students tended to make comprehension, process skills, and encoding error; (4) the type of scaffolding was given to students include the distribution of student worksheets which providing assistance according to the group’s level (environmental provisions), explaining, reviewing, and restructuring.
Using of divergent problems based on teacher scaffolding levels to grow of advanced mathematical thinking of senior high school students
Authors: Pujiastuti E , Suyitno A , Sugiman
Published: July 2020

Senior High School (SHS) students need to have advanced mathematical thinking. Its growth can be measured through divergent problem solutions based on the teacher’s scaffolding levels. The problems are: (1) How to identify the levels of scaffolding by the teacher to foster advanced mathematical thinking? (2) How to get the results of the analysis to foster of advanced mathematical thinking of SHS students through divergent problem solutions based on the teacher scaffolding levels? The research method was a qualitative approach. The subject of this study was to take 5-6 students of SHS 1 of Ungaran. Research activities: (1) identifying of scaffolding leveling by teachers to foster the advanced mathematical thinking, (2) analyze the growth of advanced mathematical thinking of students of SMAN 1 Ungaran through divergent problem solutions based on the teacher scaffolding levels, (3) conducting of solution analysis of divergent problems based on teacher scaffolding levels; Interview; data analysis; and triangulation. The results: (1) Identified the level of scaffolding by the teacher how to foster advanced mathematical thinking. (2) Obtained the analysis results to foster of advanced mathematical thinking of high school students through divergent problem solutions based on teacher scaffolding leveling. Recommended advice: Teachers need to train their students to be able to work on divergent mathematical problems and provide tiered scaffolding.
Learning reflection through the context of Central Java historical building
Authors: Nursyahidah F , Saputro B A , Albab I U
Published: July 2020

This study aims to produce a learning trajectory by using the context of Central Java historical building in helping students to understand the concept of one of material in geometry transformation that is reflection. The approach used in this research was Realistic Mathematics Education, in Indonesian version is called by PMRI. Subject of this study was the third grade students of Junior High School 6 Semarang, Central Java, Indonesia. The methodology used was a design research consisting of three phases, namely the preliminary design, the design experiment, and the retrospective analysis. However, this study only shows the results at the design experiment phase, in particular on a pilot experiment. Data collection was done through several techniques, namely: video recordings, photograph, students work result, and students interview during learning process. Student learning activities consist of four activities, namely: observing the video of Central Java historical building, determining, drawing, and finding formula of the shape result of reflection in cartesian coordinate system, determining, drawing, and finding formula of the shape result of reflection by the line which parallel to x-axis and y-axis, and solving problem related to reflection. The results of this study indicate that through a series of activities that have been designed could help to stimulate students understanding of reflection concept by using the context of Central Java historical building.
Problematic of definition and terminology affecting primary teachers’mathematical knowledge for teaching geometry
Authors: Susanto D
Published: July 2020

Mathematics is often seen as universal across cultures. However, there exist differences in symbols, conventions, terminology, and definition used in different cultures. In some situations, the distinctions may be mathematically trivial and have no adverse effect on mathematics instructions. However, in other situations, there may be significant consequences on both mathematical understanding and instructions. This paper examines one such instances in the context of learning and teaching geometry in Indonesia, where the terminology, convention, and definition used caused hurdles in primary teachers’ knowledge and understanding of the geometry concepts they teach. Some suggestions to ameliorate these challenges are proposed.
Needs analysis and data analytics skills of PGSD Department Students Universitas Negeri Semarang
Authors: Trimurtini  , Nugraheni N , Widihastrini F , Susilaningsih S
Published: July 2020

Data analytics skill in statistics is vital because it is immediately related to the accomplishment and writing of students’ final projects. The objective of the preliminary study is to describe the data analytics skills of Primary School Teacher Education (PGSD) students and analyze students’ needs in their attempts to accomplish and write the final project on time. This qualitative study was conducted at the Department of Primary School Teacher Education, Faculty of Educational Universitas Negeri Semarang, involving students in the sixth semester as the research subject. The techniques of data analysis were the interactive model by Miles and Huberman and Rasch model. The results of this study showed that students in the sixth semester needed innovation in the learning sources for educational statistics course by 95.15%. Data analytics skills of students achieved the average logit model by 0.37. The conclusion of the preliminary study is the majority of students in the sixth semester need innovation in learning sources for educational statistics course and students’ skills in analyzing data which are categorized high are only 8%.