bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of organic fertilizers and inorganic fertilizer on mustard growth in Bahway village, Balik Bukit district, West Lampung regency
Authors: Anggraini W , Fiteriani I , Prihantini Nur Nunu , Rahmawati Fri , Susanti A , Septiyani E 
Published: March 2021

Abstract
Soil fertility is the relationship between the physical, chemical and biological properties needed by plants to grow and develop. The land used as a medium for growing mustard greens is taken from Bahway Village. The soil is treated with organic and inorganic fertilizers to test its fertility. The data analysis used was one way ANOVA and the least significant difference test and a randomized block design with three treatments and two replications. The treatments were: P1=100% organic fertilizer, P2=100% inorganic fertilizer, P3=50% organic fertilizer + 50% inorganic fertilizer and control. Based on the research results, it is known that the type of soil texture in P1 and P2 has a clay-sand texture, while P3 and C have a sandy loam texture. In terms of chemical properties, the pH at P1, P2, P3 and C are 5.53, 5.79, 5.50 and 6.20. For available P values, P1 = 188.31 ppm, P2 = 7.44 ppm, P3 = 113.62 ppm, and C = 2.48. Availability of Cation Exchange Capacity P1 = 22.56me/100g, P2 = 21.80me/100g, P3 = 23.19me/100g, and C = 23.75me/100g. From these results, what showed that the growth of mustard plants increased was the P3 treatment.
An analysis on determination of land area claim prediction for rice farmers insurance business in Indonesia using nonparametric bayesian method
Authors: Maulidi I , Syahrini I , Oktavia R , Ihsan M , Emha R 
Published: March 2021

Abstract
The Government of Indonesia has issued a Rice Farming Insurance program which is known as Asuransi Usaha Tani Padi (AUTP). It is a form of protection against crop failure losses faced by farmers by providing benefit insurance as the next planting capital. This study aims to estimate the Bayes premium parameters and Bayes premium estimates for the next period with 2 planting periods-claim data using a nonparametric approach. The results of this study were obtained by assuming a maximum area of crop failure or claims that occurred were 4 hectares for each group of farmers. Also, the analysis has been done by assuming the area of claimed land as a discrete random variable so that rounding of the data was required. Rounding data used in this study are those that are rounded to the nearest integers using the regular, flooring, and ceiling rounding method.
Bibliometric analysis of physics problem solving
Authors: Ari Masitoh Putri Nagres , Latifah Sri , Saregar Antomi , Aziz Abdul , Suharto  , Jamaluddin Wan 
Published: March 2021

Abstract
Problem-solving in physics learning began to be researched in 2001. The bibliometric approach used in this study aimed to map the research literature on problem-solving in physics learning using Scopus as the metadata source. The downloaded database had been input into the VOSviewer software to be mapped. There were 52 analyzed articles taken from 24 leading journals from January 1st, 2001 to August 31st, 2020 (20 years period). The articles were written by 132 authors affiliated to 85 institutions in 16 countries. Indonesia was the most productive country. 91.7% of authors own 2 publications. From 4 reviewed clusters, the most frequently appeared keywords and topics are students, problem-solving, problem-solving skills, problem-solving abilities, and physics learning. the uncommon variables and have not been widely researched related to problem-solving in physics learning are presented along with future study opportunities.
Mathematical reasoning ability in linear equations with two variables: The impact of flipped classroom
Authors: Supriadi Nanang , Man Youlanda L. , Pirma Fitri Oktaria , Lestari Nurma Linda , Sugiharta Iip , Netriwati  
Published: March 2021

Abstract
The flipped classroom is more competent in online assignments and activities and can control students learning outcomes. This study aims to see the flipped classroom effect on the improvement of students’ mathematical reasoning abilities in the two-variable linear equation material. The method used in this research is quasi-experimental, and technical analysis using an independent sample t-test. The results showed that flipped classroom affects mathematical reasoning ability in the two-variable linear equation material. Based on the N-Gain criteria, the flipped classroom’s average value is 72.41%, which is categorized as sufficient/effective. The independent sample test calculation on the pre-test - post test data analysis with p-value = 0.000 <α = 0.005 shows that there is an effect of students’ mathematical reasoning abilities with flipped-classroom learning. The results showed that learning by flipped classroom was more effective than expository learning.
Application of algebraic tile media with gasing: Ability to understand mathematical concepts and student creativity
Authors: Pratiwi Dona Dinda , Mujib  , Andriani Siska , Mardiyah  , Kuswanto Cahniyo Wijaya , Utami Erlailia 
Published: March 2021

Abstract
This study aims to determine the effect of the GASING strategy with algebraic tile media on students’ understanding of mathematical concepts and creativity. This study uses a quasi-experimental type with Posttest Only Control Design and uses data collection instruments in the form of concepts understanding questions and creativity in the form of descriptions. The results of this study indicate: (1) there is an effect of GASING mathematics learning with algebraic tile media on the ability to understand mathematical concepts; (2) there is an effect of GASING mathematics learning with algebraic tile media on student creativity; (3) there is an effect of the GASING strategy with algebraic tile media on the ability to understand mathematical concepts and student creativity simultaneously. The explanation regarding the results of the study explains that the Treatment using the GASING strategy with algebraic tile media in the experimental class is proven to be better in increasing the ability to understand mathematical concepts and student creativity compared to conventional activities. This is following the hypothesis which states that there is an effect of the GASING strategy with algebraic tile media on students’ understanding of mathematical concepts and creativity.
The optimization of natural resources of local indonesian materials to synthesize magnetic and magnetic hybrid particles via chemical ablation, co-precipitation, and hydrothermal route process
Authors: Arjo S , Hidayat M N , Suminten N , Nurjanati B , Husain S 
Published: March 2021

Abstract
The magnetic nano-particle synthesized from natural iron sand had been successfully done. Generally, this natural iron sand is a kind of natural waste in Indonesia that has not been optimally used. This research is expected to explain the utilization of Indonesian local natural iron sand as an advanced magnetic material resource. Therefore the reader of this article can develop it for further application. Magnetic particles are a material that is very promising in supporting developments of science and technology. One of them is the development in medical fields. Most previous researchers carried out the magnetic synthesis of particles using chemicals as precursors. In this study, the researchers would like to report how to synthesize magnetic particles using local natural iron sand. The applied method consisted of three steps, namely chemical ablation, co-precipitation, and hydrothermal method. The results of this research showed that Zn-dopped magnetic particles in Quasi-spherical structures become hollow-microsphere morphological structures even though they had not been perfected yet. The Zn-dopped treatment broadens the frequency wave absorptions and magnetism properties. The Zn-dopped Ion had stronger magnetic properties than that of organic factor effects from C-dot that theoretically can decrease the magnetic properties. This article briefly describes the synthesis mechanism of magnetic material from natural iron sand as material resources to substitute highly expensive mainstream chemical material. However, this study still needs to be deeply investigated to produce the optimum scientific application.
The Role of Environment in Responding to Halal Skincare Products in Indonesia
Authors: Zaki K , Nopiah R , Walid A , Putra E P 
Published: March 2021

Abstract
Environmental conditions become one of the problems that must be considered and a solution sought. One of the causes is due to human activities in producing and consuming cosmetics industrial products, such as skincare. The study of the environment has not been much explored to what extent halal skincare products care about this issue. The purpose of this paper is to complement the lack of previous studies in discussing user perceptions related to the position of the contribution of halal skincare to environmental concerns whether it is underdeveloped or has developed ideally. The research used a quantitative descriptive method. It was conducted by distributing questionnaires to students conducting studies at universities in the city of Bengkulu, with instruments related to the demographic of respondents and their perceptions about environmental concern through halal skincare products that include content, cover, and campaign. The results show that the percentage of halal skincare content reaches 77%, cover reaches 59%, and campaigns reach 76% from the ideal condition for environmental concern.
Designing prototype model of virtual geometry in mathematics learning using augmented reality
Authors: Syafril S , Asril Z , Engkizar E , Zafirah A , Agusti F A , Sugiharta I 
Published: March 2021

Abstract
This study aims to design and to see the effectiveness of virtual geometry (VirGO) mobile application in learning mathematics based on Augmented Reality (AR). To create a virtual geometry application, the writer uses the three stages prototype method, making an AR software application using Unity3D, the process of modelling with Blender, and using Vuforia to develop augmented reality and marker. The experiment involves one hundred and twenty students in three junior high schools in Padang. The results of the study show that VirGO based on augmented reality has three advantages namely (1) the availability to display the detail objects and learning material realistically, (2) its interactivity supported by cutting-edge and powerful videos, images and animations features, and (3) increasing students’ interest in learning mathematics and reducing boredom. The results of this study have proved that learning mathematics will be interesting and more memorable if the teacher has the will and creativity in making various learning media.
Instrument analysis for motivation and interest in mathematics learning using confirmatory factor analysis (CFA)
Authors: Rinaldi Achi , Indriani Betha Ria , Yulina Rikka , Indra Saputra M. , Komarudin  , Yetri Y 
Published: March 2021

Abstract
Many studies in mathematics education discusses the relationship of latent variables that are measured directly. If latent variables measure directly, it will cause a bias in estimation. It is necessary to measure instruments that explain the relationship between latent variables and indicator variables, which should not be measured directly. This study aimed to analyze indicators of interest and motivation to learn mathematics, while the method we used is the Confirmatory Factor Analysis (CFA). Indicators of the interest in learning mathematics are 1) Feeling of Happiness, 2) Student Curiosity, 3) Student Attention, 4) Student Involvement, while the indicators for motivation are 1) Perseverance in Learning, 2) Facing Difficulties Ability, 3) Sharpness in Attention 4) Achievement in Learning, 5) Independent in Learning. Four indicators of interest in mathematics show that only two indicators are qualified based on the Kaiser Mayer Oikin (KMO) score of 0.611 for the indicator of student curiosity and 0.507 for student involvement indicators. While the three indicators of motivation, which qualified based on the KMO score of 0.685 for perseverance in learning, 0.628 for facing difficulties ability, and 0.616 for the sharpness of Attention.
Optimal strategy in controlling non-vector pest insect using green insecticide and mating disruption with cost-effectiveness analysis
Authors: Fitri I R , Bakhtiar T , Hanum F , Kusnanto A 
Published: March 2021

Abstract
Pest insect is one of the major pests that cause damage and loss in agriculture around the world. This threat also comes with other complex problems such as environmental hazards by the indiscriminate pesticide and the rapid development of insects due to the environmental change. Therefore, more environmentally friendly and sustainable control methods need to be implemented. This paper discusses a generic model to describe plant-insect interaction and focuses on the interaction between non-vector pest insect and plant. The model consists of a set of non-linear ordinary differential equations representing insect-plant predator-prey interaction with the addition of two controls, namely green insecticide and mating disruption. An optimal control approach was exploited to solve the control problem and find a set of control strategies that regulate the system optimally. The simulations were conducted for three strategies and four scenarios describing possibilities in the real-world application. Our results suggest that all strategies managed to prevent agriculture loss. A cost-effectiveness analysis was conducted to examine the cost and benefit of applying each strategy.
The influence of e-scaffolding in blended learning on prospective teacher’s scientific explanation
Authors: Amelia Rizki 
Published: March 2021

Abstract
Science is not only about facts and concepts, but also involves a scientific way of thinking and reasoning. The ability of scientific reasoning in science consists of explaining the facts in a problem (claim), connecting these facts with related concepts (evidence), and explaining the problem scientifically (reasoning). Scientific reasoning ability is a crucial ability in a prospective teacher. The results of observations at Islamic Primary School Teacher Education UIN Maulana Malik Ibrahim Malang found that the scientific reasoning abilities of prospective Islamic Primary School Teacher Education were still not developed. One of the strategies that can optimize students’ linking between concepts is scaffolding in blended learning. This study aims to examine the influence of e-scaffolding in blended learning on prospective teacher’s scientific explanation. This research was a quasi-experimental research with a pre-test - post-test control group design. The research sample was taken using purposive sampling technique. The sample of this study consisted of 30 prospective Islamic Primary School Teacher with science concentration. The instrument for measuring scientific reasoning ability was description questions. The data analysis of this research used a t-test. The result of this study found out that e-scaffolding in blended learning influences the prospective teacher’s scientific explanation.
An analysis of the ability of mathematical connection with the material of rectangles and triangles
Authors: Qondiyana D , Riyadi  , Siswanto dan 
Published: March 2021

Abstract
This research aimed to analyze students’ mathematical connection ability in the material of rectangles and triangles. The method put on research is descriptive qualitative method. The research subjects were selected using a purposive sampling technique according to the classification of high, medium, and low initial abilities consisting of 2 students in each category. The selected subjects composed of 2 students based on the measurement scale of high ability category and the selected students had received material on rectangles and triangles. The research consisted of a test question instrument of mathematical connection. The results represented that mathematical connection ability with the material of rectangles and triangles is in a medium ability, that students can recognizing and using mathematical concepts outside the context of Mathematics in solving real-life problems. Some students can use the connection among mathematical concepts with other mathematical concepts but student did not provide the correct solution to the problem and some students cannot identify problems and use mathematical concepts.
Analysis of mathematic creative thinking skill with the material of matrix
Authors: Yuniarti A P , Pramudya I , Slamet I 
Published: March 2021

Abstract
Creative thinking skill is an ability to provide possible ideas and logical answers based on the information provided. The research aimed to identify and describe the creative thinking skills of mathematics. The type of this research was a qualitative descriptive research. The sampling technique used purposive sampling. The results showed that of the 5 subjects, 20% of the subjects were unable to show the three indicators of creative thinking abilities in mathematics (not creative), 40% were able to show indicators of fluency (less creative), 20% were able to show Originality (creative enough), and 20 % were able to show indicators of fluency and flexibility (creative).
An analysis of generic science skills as 21st-century skills for preservice physics teacher at UIN Raden Intan Lampung
Authors: Yuberti  , Kartika Ika , Pratiwi Indah , Riyadi Beli , Latifah Sri , Pilia Qory Mei 
Published: March 2021

Abstract
This study aimed to describe the generic science skills of students who were conducting experiments on the mechanics practicum. This research was qualitative descriptive research. The research subjects were the students of the Physics Education Study Program of UIN Raden Intan Lampung in the academic year of 2019 with a total of 130 students. The data collection technique employed was the non-test technique with the observation sheets and interview guidelines as the research instruments. Student activities were observed by 4 observers through direct observation, indirect observation, quantities scale awareness, logical framework, the law of cause and effect, observation, and conclusion. The indicators of the generic science skills in this research were based on the analysis of previous research related to the relationship between generic science skills and 21st-century skills. The percentage of generic science skills was analyzed using descriptive statistics. The results showed that the students’ overall average generic science skills were 67% which was in the moderate category. The highest was in the direct and indirect observations with a percentage of 78% which was in the high category while the lowest was in the principle-compliant logic framework with a percentage of 59% which was in the poor category. Due to the poor research results in several categories, it is suggested that educators reaffirm generic science skills in learning considering the importance of these skills to support students’ understanding and skills.
An analysis of the process of refractive thinking of eighth-grade students of State Junior High School in solving problems of linear equation system of two variables
Authors: Fatoni F , Sujadi I , Subanti S 
Published: March 2021

Abstract
Refractive thinking is a thinking process performed by a person to make a solution of decision from several alternative solutions through a process of reflection and critical thinking. This study aimed to describe the process of refractive thinking of eighth-grade students in solving the problems of linear equation system of two variables. This study was qualitative descriptive research. The collected data was analyzed through three stages, including data reduction, data display, and verification of conclusions. The results showed that in the refractive thinking of the students from the two subjects in solving SPLDV problems, the thinking characteristics of the subjects were in accordance with the flow of the process of refractive thinking, which was being able to decide the best solution from several alternative solutions when solving SPLDV problems by using a procedure for processing SPLDV by changing the story problems to a mathematical model, followed by an elimination procedure so that it can be done quickly and precisely. The subjects had gone through the process of identifying problems, strategic, and evaluation stages in refractive thinking.
Identification of electrical impedance correlation using interdigital transducer (IDT) electrode and blood glucose by giving variations of sugar concentration to male mice
Authors: Wulandari Dewi , Widodo Chomsin Sulistya , Retnaningtyas Ekowati 
Published: March 2021

Abstract
The electrical impedance depends on the frequency and material with the specific frequency using a Bioelectrical Impedance Spectrometer (BIS), a material detection using an Interdigital Transducer (IDT) electrode, and data process using software Data Acquisition (DAQ). The current electricity used in this tool is AC. The purpose is to identify the electrical impedance correlation to glucose, the effect of natural sugar on male mice’s blood, and identify impedance values in glucose conditions. The method is grouping the mice because they were given a variety of drinks for 1 month. The tails of mice were cut for blood and tested. Data stored using Microsoft Excel, Bode, and Nyquist plots of data stored in the form of images. Data processing using Ms. Excel. The results are glucose value generated from this study was normal. So far nothing significant has been found. The conclusion is that there is no discovery between electrical impedance and glucose in this study, due to several factors such as time, human error, measuring instruments, and the environment. Other animal factors are the effects of metabolism, lifestyle, size, body weight, and undetected disease. This study concludes that the value of glucose produced by each animal is different.
Probabilistic thinking level of junior high school 2 Rembang students who have not formally learnt probability material
Authors: Khoirunnisa S , Sujadi I , Subanti S 
Published: March 2021

AbstractThis study aimed to describe the level of probabilistic thinking of students with high mathematics abilities and have not formally learned about probability material in Junior High School of 2 Rembang. The research subjects were 2 seventh graders with high mathematics abilities. This research was qualitative research that employed the case study. The main instrument of the research was the researcher and the supporting instruments were the task in the form of probabilistic problems and interview guidelines. The data had been validated using the triangulation of the method. The results showed that the level of probabilistic thinking of junior high school students with high mathematics abilities who have not formally learned the probability material are as follows: (a) In the construct of sample space, the students were at the level of informal quantitative level (level 3) with the characteristics of being able to list the results of stage two experiment using part of the generative strategy. (b) In the construct of experimental probabilities of an event, the students were at the numerical level (level 4) with the characteristics of being able to collect appropriate data to determine the numerical value of the experimental probabilities. (c) In the construct of probabilities comparison, students were at the numerical level (level 4) with the characteristics of being able to determine the size numerically and compare the probabilities.