bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and characterization of electrospun fiber chitosan/polyvinyl alcohol/polyvinylpyrrolidone
Authors: Jumaeri  , Harjono  , Albab D R U , Setiawan J , Pranjono  
Published: July 2020

AbstractSynthesis and characterization of electrospun fiber chitosan/polyvinyl alcohol/polyvinylpyrrolidone have been studied. Electrospun fiber is a fiber produced from the electro spinning process that utilizes the power of electricity to produce polymer fibers with nano to micro diameters. The purpose of this study is to synthesis and characterize electrospun fiber from chitosan/polyvinyl alcohol/polyvinylpyrrolidone. The mixture of chitosan/polyvinyl alcohol/polyvinylpyrrolidone solution is placed in an electrospinning capillary with a diameter of 0.57 mm with an electrospinning voltage of 25 kV and a distance between the tip of the spinneret and the collector by 10 cm. The resulting electrospun fiber is analyzed with fourier transformed infrared spectroscopy and scanning electron microscopy. Based on the FTIR spectra, it was found that the electrospun fiber produced consisted of chitosan, polyvinyl alcohol and polyvinylpyrrolidone. SEM analysis results show that the electrospun fiber obtained has an average diameter of 93.1 - 168.7 nm.
Methoxylation of α-pinene using NiO/Y-Zeolite catalysts
Authors: Wijayati N , Solikhah  , Widiarti N , Mahatmanti W , Rakainsa S K 
Published: July 2020

Abstract
α-Pinene in turpentine oil can be processed further to produce high value derivative compounds. One of the chemical process that can be used to increase of the value of α-pinene is by methoxylation by using certain catalysts. This study aims to determine the effects of time, temperature, and type of catalyst in the methoxylation of α-pinene. Characterization of the catalyst include: crystallinity by XRD (X-Ray diffractometer), the functional groups analysis by FT-IR (Fourier-Transform Infrared Spectroscopy), surface area of catalyst with SAA (Surface Area Analyzer), and the acidity test by gravimetric method. Modification of the catalyst with NiO does not change the crystal structure of Y-zeolite significantly. Methoxylation was carried out in a modified batch reactor with mixer at various temperatures 40, 50, 60°C and time variations for 1, 2, 3, 4 hours. Reaction products were identified by GC (Gas Chromatography) and GC-MS (Gas Chromatography Mass Spectrometry). The product of α-pinene methoxylation was found to be patchouli alcohol. The highest selectivity (67.06 %) and conversion (75.41%) were obtained at the temperature of 60°C and at reaction time of 4 hours with NiO/ZY catalyst. NiO/ZY catalysts is more selective to be used in the α-pinene methoxylation compared with H-ZY.
Using of low grade zeolite based fly ash as slow release agent for Zea mays growth
Authors: Jumaeri  , Sumarni W , Ningrum L W , Rahayu E F 
Published: July 2020

AbstractThe present work introduce synthesis low grade zeolite from fly ash and its application as urea slow release agent onZea maysgrowth. The characterization of the synthesized zeolites were determined using X ray diffraction method and FT-IR spectroscopy. The zeolite that has been formed is added to urea fertilizer with a weight ratio of urea: zeolite as follows 1: 1, 1: 2, 1: 3. As much as 3 kg of soil is put in a polybag series and was added with 3 g urea slow release fertilizers. The polybags were planted withZea maysplant 1 week in old at a depth of ± 5 cm. The plant growth parameters which include plant height plant, number and colour of leaves were observed every 7 days for 4 weeks Base on the diffraction pattern and IR spectra, the characteristics of the synthesized zeolite is matching with standard zeolite A. The use of urea slow release fertilizer onZea maysplants showed better growth than using urea fertilizer without zeolite slow release ingredients. The treatment of soil with urea/zeolite 1:3 proven to produce the bestZea maysgrowth in interaction time 4 weeks.
Students’ innovative and creative thinking skill profile in designing chemical batik after experiencing ethnoscience integrated science technology engineering mathematic integrated ethnoscience (ethno-stem) learnings
Authors: Sudarmin  , Sumarni W , Mursiti S , Sumarti S S 
Published: July 2020

Abstract
This research aims to measure the innovative and creative character of Chemistry students in batik motifing of Chemical structures after learning natural products with the integrated STEM approach Ethnoscience. This type of research is a qualitative descriptive study with students of Chemistry education at UNNES taking Natural Product courses as a subject. Instruments data collection are questionnaires, interviews, the value of chemical batik products, and creativity in describing the meaning of batik motifs, appearance, origin, and color creations that have been designed on canvas. Chemical batik products produced by Ethno-STEM Project study were assessed by a research team and batik experts from Zie Batik Malon Gunungpati and batik experts from Pekalongan to determine which batik motifs are feasible to be produced as a form of research downstreaming. The final result of the batik design was decided that four decent batik products were produced in terms of motifs, color display, originals, and interesting creativity according to the judgment of batik experts. The four innovative and creative batik motifs with high scores are the anti-Christian batik motif, alpha pinene, curcuminoid, and Etbo-STEM carotenoids. From the results of this study it was concluded that the profile of innovative and creative character of students after learning with the Etno-STEM approach is very good.
The effectiveness of the quizizz interactive quiz media as an online learning evaluation of physics chemistry 1 to improve student learning outcomes
Authors: Purba L S L 
Published: July 2020

Abstract
This study uses a quantitative approach with experiment. The population in this study were all students of the Faculty of Chemistry Education Teacher Training and Education (Guidance and Counseling) Indonesian Christian University (UKI), which follows the course of Chemical Physics 1. The purpose of this study was to determine the effectiveness of an interactive quiz quizizz as a medium of learning on-line evaluation of the course of Physical Chemistry 1. Data collection techniques used is a test instrument as much as 10 multiple-choice questions that have been testing the validity of the expert validator. Data analysis technique used is the non-parametric Wilcoxon Signed Rank Test. UseIBM SPSS 23. From the analysis of data obtained asymp. Sig. (2-tailed) was 0008, of which 0.008> 0.05. Because the value is less than 0.05, it can be concluded that the use of an interactive quiz quizizz as a medium for on-line evaluation of learning in the subject of physical chemistry 1 effective against student results.
The effectiveness of guided inquiry learning based on contextual to improve chemistry literacy ability of senior high school students
Authors: Wardani S , Anggraeni A Y 
Published: July 2020

Abstract
This research aims to determine the effectiveness guided inquiry learning based of contextual to improve chemistry literacy ability of students. This is an experimental research with pretest-posttest control group design and cluster random sampling as sampling techniques. The samples of this research are two different classes of X MIPA. The ability of chemistry literacy is tested using chemistry literacy test and questionnaire. Data analysis uses T-test, N-gain, classical learning pass, and questionnaire data descriptive analysis. The result of this research provided average score of posttest of chemistry students literacy of experiment group 72.86 and 63.42 for control group. Classical learning pass of experiment group is 78.57% and control group is 38.71%. N-gain analysis result provided the ability of chemistry literacy in every aspect of experiment group is better than control group. T-test result are tcount 3.66 and is bigger than ttable 2.00, it means that the ability of chemistry literacy of students in experiment group is better than the one in control group. Questionnaire analysis result provided around 68% in good category. Based on research results, it can be concluded that by using guided inquiry learning based of contextual, students’ chemistry literacy ability is improved significantly.
Increase the hierarchy concept map score through the modification in the 2ndstage of problem-based learning
Authors: San S M , Widoretno S , Ariyanto J , Sajidan  , Dwiastuti S 
Published: July 2020

AbstractThe research aimed to calculate the increase of student’s hierarchy concept map (CM) scores through the modification of problem analysis and learning issue (2ndstage of problem-based learning (PBL)) using question instructional techniques. The type of research is classroom action. Research subjects were 36 X grade students. Research procedures: planning, action, observation, and reflection. Research data is the percentage of hierarchy CM score which is calculated based on the Expert CM score according to the material in each cycle. Data validity is done by confirming the percentage of hierarchy CM score with the result of interviews and documentation of the learning process in each cycle. The analysis techniques use reduction, presentation, and drawing a conclusion. The results show that the average increase in hierarchy percentage scores from pre-cycles to cycle I was 25% and cycle I to II was 38%. The number of students who experienced an increase in percentage hierarchy scores from pre-cycle to cycle I was 83% and cycle I to II by 90%, thus the modification of instructional techniques in problem analysis and learning issues PBL increased the students’ CM hierarchy score.
Students’ literacy profile on STEM-blended learning implementation in ecosystem material
Authors: Ngabekti S , Partaya  , Martin HB P , Nugroho BT 
Published: July 2020

Abstract
This study aims to analyze the student literacy of students of Biology Education Department FMIPA Universitas Negeri Semarang in because of the implementation of blended learning base on STEM in Ecosystem material. This research method was quantitative research with an experimental approach using “One Shoot Case Study” design. The implementation of blended learning would consider to be successful if accomplished three aspects: (1) the implementation scenario runs well in accordance with the specified time allocation, (2) students reaches the moderate to a high level of technological literacy, (3) the implementation is successful with no severe obstacles while student response it positively. The results exposed that the middle of the second semester could accomplish the implementation of blended learning base on STEM in the Ecosystem material. This research shows that student science literacy has reached mastery learning, with AB (14%), B (72%), and BC (14%). Student technology literacy achieved very high scores. That was the highest one compared to other STEM components: science literacy and mathematics literacy. Student technology literacy ranges from 74.4-93.5, with mastery learning. Students’ mathematical literacy ranged from 42-76, with an average of 58.32, including the low category. Furthermore, most of the students expressed positively on the use of the Edmodo application, which contains an introduction and videos. The founded drawback was the technology used was still simple, and the steps in using technology tools in blended learning were incomplete.
DKI Jakarta vegetable food commodity inflation modeling with tsclust approach using k-error method
Authors: Sumertajaya I M , Aidi M N , Safitri E , Rahkmawati Y 
Published: July 2020

Abstract
Inflation is a critical indicator in showing economic symptoms about prices in a region. The Province of DKI Jakarta is the nation’s capital city which plays an important role in the national economy including national inflation. An interesting commodity group is foodstuffs because it contains commodities that play a significant role in inflation in DKI Jakarta. TSClust approach was able to reduce the model by first bundling the commodities together. K-Error is a clustering method that incorporates the error element related to data to be clustered into the clustering step. The purpose of this study is to forecast inflation in Jakarta’s agricultural food commodities with the K-Error. Clustering with the K-Error resulted in a lower pseudo F value as the number of clusters increases. Next, the selection of optimum number of clusters was based on a stable pseudo F value, such as the value k = 4 to k = 8. Based on the RMSE value, the optimum number of clusters selected is 5 clusters with unique models. Based on the RMSE value, it can be seen that forecasting at the individual level produced RMSE values that were not significantly different from RMSE level of the cluster for each commodity.
Dynamic model of disease spread with two infection stages
Authors: Rifanti U M 
Published: July 2020

AbstractThe spread of infectious diseases has always been of concerns and a threat to public health. It has caused serious problems for the survival of human beings and other species. In epidemiology, mathematical models are the basic conceptual tools used to understand epidemic dynamics and to formulate control strategies. A mathematical model of the transmission dynamics of infectious disease is an important theoretical epidemiology method, which has been used to simulate in analyzing and control of infectious diseases. In this paper, we will discuss about disease model with infection-stage structure, where the period of infection is partitioned into two stages: the acute and the chronic stages. The disease-free equilibrium was locally asymptotically stable whenR0< 1 and the endemic equilibrium was locally asymptotically stable whenR0> 1.
Application of the spatial empirical best linear unbiased prediction method for estimating per capita expenditure in Lampung province
Authors: Widiarti  , Oktafiani DD , Usman M , Kurniasari D 
Published: July 2020

Abstract
Spatial Empirical Best Linear Unbiased Prediction (SEBLUP) is one of the methods in small area estimation. This method is the development of EBLUP by observing the influence of random spatial correlated areas. One application of this method is the estimation of per capita expenditure in each district/city in Lampung Province. This estimation is based on the existence of additional information on the number of births of the population from each district/city. In this study, the SEBLUP method was applied to the two-level model Normal-Normal and weighting matrix determination based on the type of queen contiguity. Based on the monthly household expenditure data in the Province of Lampung in 2017, Bandarlampung and Metro are areas with high per capita income levels.
The effectiveness of problem based learning (PBL) model with ethnomatematics to improve mathematics literation ability of high school students
Authors: Zaenuri  , Imam F , Nugroho S E 
Published: July 2020

Abstract
The purpose of this study is to determine the effectiveness of the problem-based learning model with nuances of ethnomatematics on the ability of mathematical literacy. The study was conducted at SMA Negeri 1 Mranggen. The research method used is a combination research method with a concurrent embedded model. The sampling technique uses cluster random sampling. Data collection uses documentation, questionnaires, test results, and interviews. The results showed the model of problem-based learning nuanced effective ethnomatematics against students’ mathematical literacy abilities.
Developing mathematics learning materials of fifth grade of elementary school integrating mathematics game, problem posing, and manipulative
Authors: Kurniasih A W , Hidayah I , Asikin M 
Published: July 2020

Abstract
The purposes of this study were obtained the validity, practicality, and effectiveness of the learning tools that have been integrated teacher stimulus that has been formulated in the design of mathematics learning of fifth grade of elementary school. This development research refers to the 4-D development model developed by Sivasailam et al. (1974) consisted of 4 stages of definition, design, development, and disseminate. This research did not reach the fourth stage. The learning model used is 1) Teams Games Tournament model with the research subjects of Plalangan 1 public elementary school students as many as 44 students with integrated stimulus were problem-posing and the use of manipulative teaching aids, 2) Creative Problem Solving with research subjects Pakintelan 1 public elementary school students with 25 students with stimulus that is integrated were a mathematical game and the use of manipulative. The research instruments were mathematical games, math game discussion sheets, test sheets, problem-posing discussion sheets, tests containing problem posing, student response questionnaire sheets, learning material validation sheets, and learning implementation sheets. The results showed that the learning materials in Plalangan 1 that integrated stimulus problem posing and the use of manipulative were valid, effective, and practical. The results showed that the learning tools in Pakintelan 1 that integrated the stimulus of mathematical games and the use of manipulative were valid, effective, and practical. The further research by applying mathematical stimulus games, problem posing, and the use of manipulative to describe high-level thinking of elementary school students.
Mathematical imaginations and constructing algebraic concept
Authors: Dwijayanti I , Nugroho A A 
Published: July 2020

Abstract
Imagination has a valuable role in the process of education for humans. The purpose of the study to determine the role of mathematical imagination to construct an understanding of mathematical concepts. The purpose of this qualitative exploratory study was to analyze students’ gestures in understanding algebraic expression. It involved 32 in Junior high school students in Semarang city. Time triangulation was utilized to assure data validity. The results showed that students employed. The results: 1) imagination involved to understand the concept of variables, coefficients or constants is perception visualization that presents the possibility of actions representing a container, representing sum of objects in a container and representing representing sum of objects; 2) imagination in other processes is perception visualization that presents the possibility of action giving examples of algebraic expression, giving examples rather than algebraic expression, and identifying equations. This study yields an important description of misconceptions that are detected through students’ imagination.
To grow a joyful learning in SLB through a manipulative teaching aid based on multi-function video
Authors: Sugiman  , Suyitno Hardi , Walid  
Published: July 2020

Abstract
Students in SLB need to be given a joyful learning. The problems were: (1) How to identify the need for Manipulative Teaching Aids based on Multi-Function Video? (2) How was the analysis of the growth of Joyful Learning in SLB students through the application of Manipulative Teaching Aids based on Multi-Function Video? The goals: (1) To identify the need for Manipulative Teaching Aids based on Multi-Function Video. (2) To foster of Joyful Learning in SLB in mathematics learning through the application of Manipulative Teaching Aids based on Multi-Function Video. The research method is a qualitative approach. Main Activities: (1) Identifying the need for manipulative teaching aids for SLB students (2) analyzing how to grow a Joyful Learning in SLB in mathematics learning, (3) implementing Manipulative Teaching Aids based on Multi-Function Video to support the growth of Joyful Learning in SLB in mathematics learning. (4) conducting interviews with research subjects; data analysis; and triangulation. The results: (1) Identified needs of Manipulative Teaching Aids based on Multi-Function Video for SLB. (2) Joyful Learning grows in SLB through the application of Manipulative Teaching Aids based on Multi-Function Video.
Development of ICT-assisted preprospec learning models
Authors: Dewi N R , Arini F Y , Ardiansyah A S 
Published: July 2020

Abstract
The main objective of this research is to develop an ICT-Assisted Preprospec Learning Model. This learning model was developed specifically for learning mathematics and consists of five stages, namely Prepare, Problem Solving, Presentation, Evaluation, Conclusion which at some stages use media based on Information and Communication Technology (ICT). The use of media based on ICT is intended to make learning more effective and efficient. In addition, abstract mathematical characteristics, using a lot of graphics and images and being applied in real life and other scientific disciplines are considered to use ICT-based media in learning. The ICT-Assisted Preprospec Learning Model is expected to improve mathematical problem solving abilities as the heart of mathematics and student’s self-renewal capacity. The development of this ICT-assisted Preprospec Learning Model uses the ADDIE Model which consists of 5 stages, namely analysis, design, develop, implement and evaluate. The results of this study indicate that ICT-assisted learning model Preprospec valid and ready to be used for learning.
ASPIRE model (analysis, scaffolding, project, investigation, reaction, and evaluation) for mathematical creative thinking ability
Authors: Munahefi D N , Kartono  , Waluya S B , Dwijanto  
Published: July 2020

Abstract
ASPIRE model is an innovation in mathematics learning that is expected to develop mathematical creative thinking ability. The aspects of the ASPIRE model consists of analysis, scaffolding, project, investigation, reaction and evaluation. The research aims to describe the steps of the ASPIRE model. analysis is the stage where students are analyzed their abilities through filling out questionnaires or online tests so the teacher understands the ability of students and gives them treatment according to their abilities. Scaffolding stage is the provision of assistance, motivation, and direction to students in conducting learning activities. Project stage is implementing learning material in a project assignment. Investigation stage is the process of investigating the results of project tasks and communicating them so that they can be compared with the acquisition of others. Reaction stage is applying of problems related to the material in project task. Evaluation is the stage of testing the ability of students individually. The ASPIRE model is a combination of project-based learning models, problem-based learning, and investigative learning that all three learning models are considered capable of developing mathematical creative thinking ability.
Growth of student mathematical creativity as part of 4C competence for entering the 21st century
Authors: Suyitno A 
Published: July 2020

Abstract
The purpose of this article is to examine the lecturers’efforts to foster students’ Mathematical Creativity as part of the 4C Competency to enter the 21st Century, which students must have. The review of this article is based on the results of the Dissertation research conducted by a qualitative approach. The subject of this research, by taking 6 students of Mathematics Education of FMIPA of UNNES. The main activities of this basic research were: (1) identifying the scaffolding stages by the lecturer to foster students’ Mathematical Creativity; (2) analyse the fundamental thinking to foster students’ Mathematical Creativity through the provision of open ended problems. The results: (1) The scaffolding stage was identified by the lecturer to foster students’ Mathematical Creativity. (2) Obtained the results of an analysis of fundamental thinking to foster the students’ Mathematical Creativity through the provision of open ended problems. Suggestion: To prepare the students as teachers candidate in the 21st century, students need to grow their Mathematical Creativity competencies. Students must also be trained to be able to create of open ended problems based on HOTS.