bluuebunny/crossref_metadata_2025_split huggingface dataset:
Organic fertilizer of coffee peel with PUMAKKAL starter formula for sustainable plantation cultivation
Authors: Yenani Eva , Santoso Handoko , Sutanto Agus , Muhfahroyin  
Published: March 2021

Abstract
Coffee is a strategic commodity that generates promising foreign exchange, where Lampung is the main coffee production centre which continues to increase its production, and more than 80% of it is smallholder coffee. Between 40% and 55% of coffee, production is coffee husk waste, which has not been optimally utilized. Previous research showed that pineapple liquid waste indigen bacteria (Pumakkal) were able to increase acidity and decompose waste organic matter, and the final result was a suitable fertilizer for plant cultivation. This research will solve the problem of coffee husk waste used as compost by utilizing a starter from the previously tested pineapple liquid waste bacteria (Pumakkal). The research was conducted with the first stage of making coffee skin compost with a starter formula of KA (3 bacteria), KB (6 bacteria), KC (9 bacteria), KD (12 bacteria) and KE (15 bacteria), the second stage was to test the quality of the coffee husk compost organic fertilizer followed by a pilot plan application using the best formula. The application uses spinach and chilli plants. The result shows that KC is a model the most appropriate coffee skin compost starter formula.
Improving student cognitive learning outcomes through the development of interactive multimedia-based biology learning at Muhammadiyah University, Bengkulu
Authors: Topano A , Asiyah  , Basinun  , Walid A , Alimi  , Febrini D 
Published: March 2021

Abstract
This study aimed to improve student cognitive learning outcomes through the development of interactive multimedia-based biology learning at Muhammadiyah Bengkulu University. This research was conducted in April – September 2019. This research is a 4-D (four-D) model development research. The instruments used in this study were a media validation questionnaire, a media practicality questionnaire, a cognitive ability test. Based on the results of data analysis obtained from the results of media validation, it was stated that the media developed was valid by the validator with a mean score of 78.88% and the media practicality questionnaire results were also stated to be very practical with an average score of 86.28% while for student cognitive learning outcomes are normally distributed and homogeneous, where the data obtained during the pre-test for small classes the average score is 70.00% and for the post-test score is 81.78%, while at the time of large class trials the pre-test score was 46.18% and the post-test score was 83.00%. From these data, it shows that there is a significant difference in the average value between the acquisition of pre-test and post-test scores both during small class trials and large class trials. Where the average score of student scores has increased after using interactive multimedia-based learning media (post-test). So that this learning media is very effective to use as learning materials to improve student cognitive learning outcomes.
Pumakkal compost formula for degrading shrimp pond sediment (As a learning source of Biology subject)
Authors: Ariyani Euis , Sutanto Agus , Sujarwanta Agus , Widowati Hening , Achyani  
Published: March 2021

Abstract
Research used completely randomized design (CRD) 5 treatments of C3 (3 bacteria), C6 (6 bacteria), C9 (9 bacteria), C12 (12 bacteria) and C15 (15 bacteria) 5 replications. Compost quality is measured activated carbon, Nitrogen (N), C / N ratio, levels of phosphorus (P), calcium (Ca) and potassium (K). A total of 30 samples weighing 300 g each after 30 days of fermentation was analyzed in the Chemistry Laboratory of the University of Muhammadiyah Malang. The results showed that the five treatments were significantly different. Pumakkal Pineapple Liquid Waste Bioremediator is able to degrade shrimp pond sediments into Shrimp pond sediment compost (KSTU), from the parameters of organic carbon, C / N ratio, nitrogen, phosphorus, potassium and the degree of acidity (pH). The most effective treatment is Konsorsia C15 (15 isolates) with the best average yield. Treatment of C15 consortia (15 bacteria) obtained 25% C-organic yield, for a C/N ratio of 24; Nitrogen (N) 3.4%, Pospor 2.3%, from Potassium 2.1%, Calcium (Ca) content 20%and pH 7.2
The profile of 8thgraders’ level of statistical thinking: A case of analyzing and interpreting data
Authors: Meylasari N D , Sujadi I , Subanti S 
Published: March 2021

AbstractThis research aims to describe the profile of the level of statistical thinking of 8thgraders of junior high school in the case of analyzing and interpreting data related to statistical problems. Using the statistical thinking framework by Mooney. The ability to think statistically is not only needed when students learn, but is needed when someone makes decisions. This is a qualitative research with the subjects of two eighth graders of SMP Walisongo 1 Semarang with the high initial abilities which can be seen from the subject behaviour in solving problems provided when the data were collected using Think Aloud method. The research findings showed that subjects with high initial abilities had the characteristics of statistical thinking at the 3rdlevel: Quantitative since the subjects were more effective and complete in presenting their ideas, and used quantitative information in solving statistical problems. The 3rdlevel: Quantitative showed that subjects provide several correct and appropriate responses to the data provided, subjects make a comparison of the several data, but they cannot compare the data as a whole, and subjects can only make correct conclusions based on the problem provided, even though the subject have not been able to make an overall conclusion.
SQ3R method assisted by ethnomathematics-oriented student worksheet: The impact of mathematical concepts understanding
Authors: Suherman  , Rahmadani Nanda Ayu , Vidákovich Tibor , Mujib  , Fitria Nike , Sari Putri Nur Islam , Addarojat Muhammad Rofi’uddin , Priadi Maskur 
Published: March 2021

Abstract
This study was aimed to determine the impact of the SQ3R method assisted by ethnomathematics-oriented student worksheets on students’ ability to understand mathematical concepts which compared with the SQ3R method without ethnomathematics-oriented student worksheets. The research method used was quasi-experimental research. The SQ3R method assisted by an ethnomathematics-oriented student worksheet was implemented in the experimental class while the control class was treated by the SQ3R learning method. The design of this study was the pretest-posttest control group design to see the effectiveness of the SQ3R method assisted by ethnomathematics-oriented student worksheets. A cluster random sampling technique was used to determine the sample of the study. The data collection technique employed in this study was an essay test to measure the students’ ability to understand mathematical concepts. The results showed that the SQ3R method assisted by ethnomathematics-oriented student worksheet was more effective toward students’ mathematical concepts understanding compared to the SQ3R learning method. The application of learning provided better results in increasing students’ ability to understand mathematical concepts.
Characteristic testing (performance) of CaSO4: Dy thermoluminescent ring dosimeter according to the ISO 12794:2000
Authors: Maula Evita Muthia’tul , Noor Johan , Bunawas  
Published: March 2021

Abstract
CaSO4: Dy thermoluminescent dosimeters (TLD) disc known as TLD-900 is widely used for personal dosimetry purposes. An optimum response dosimeter procedure can be determined from its characteristics. The equivalent dose limitation for hands and feet or skin Hp (0.07) of 500 mSv/year. Therefore, we need a device to measure the radiation dose to optimize the safety of radiation workers so do not exceed the limit detection. The research objective is to produce accurate dosimeters by testing the characteristics of personal dosimeters according to ISO 12794: 2000. Tests of 129 dosimeters were tested with dosage variations of 0.3, 0.5, 1, 3, and 5 mSv in the 90Sr beta, gamma 137Cs, and x-ray voltage 20-100 kV in Secondary Standard Dosimeter Laboratory (SSDL). The results of tests obtained the dosimeter’s dependence on angle variations is relatively small and has a high energy dependency. Obtaining a dosimeter limit for the detection of extremities for beta and photon radiation less than 1 mSv with the lowest sensitivity being at 80 keV of 24 µSv. The dosimeter response to extremity is good, evidenced by the reading values within the trumpet curve range set by the IAEA and EURADOS.
The classification of the level of land degradation as the flood cause in some sub-watersheds at Pesawaran Regency, Lampung
Authors: Nugraheni Irma Lusi , Suyatna Agus , Setiawan Agus , Abdurrahman  
Published: March 2021

Abstract
The purpose of this study was to evaluate the distribution and classification of land degradation levels in several sub-watersheds in the Pesawaran Regency. This research employed the survey and non-experimental approaches. The research was conducted in four sub-watersheds of Pesawaran Regency, namely Way Semah, Way Punduh, Way Ratai, and Bulok. Topographic, land-use changes, soil type, and rainfall were the parameters used to assess the degradation of sub-watersheds. The land analysis unit was the unit of interpretation and mapping. The results showed that the dominant factors causing land degradation were changes in land use for settlements and agriculture. The sub-watersheds with the highest degradation was Way Ratai.
Adiwiyata school in Indonesia: A correlation between eco-literacy, environmental awareness, and academic ability with environmental problem-solving skill
Authors: Sigit Diana Vivanti , Prastiwi Lenny , Ristanto Rizhal Hendi , Rifan Muhamad 
Published: March 2021

Abstract
Environmental problem-solving skill is defined as a person’s skill to find solutions to the differences between the current environment and the expected environment. This study aimed to analyze the correlation between ecological literacy, environmental awareness, and academic ability with environmental problem-solving skills. The research method used was descriptive quantitative with survey techniques. The respondents consisted of 245 students of grade 11th science from 3 Adiwiyatas’ Senior High Schools in Tangerang City. The study used descriptive quantitative methods with survey techniques. The research instrument used in this study were tests and questionnaires. The Pearson Product Moment correlation formula tested the research hypothesis at α = 0.05. The results showed a strong enough positive relationship between ecological literacy, environmental awareness, and academic ability with environmental problem-solving skills with a correlation coefficient of 0.462. Based on these results, it can be concluded that an increase will follow the higher the score of ecological literacy, environmental awareness, and academic ability in the score of the environmental problem-solving skill. Other schools are also expected to implement the Adiwiyata program so that students can develop ecological literacy, environmental awareness, academic ability, and environmental problem-solving skills.
Karst and conservation research in Indonesia and its implication to education
Authors: Sulistiyowati E , Setiadi  , Haryono E 
Published: March 2021

AbstractIndonesia hosts a vast area of karst landscapes that expand from the island of Sumatra to Papua. Along with the implementation of the World Heritage List and Global Geopark Network, karst environment has become essential topics in Indonesia. By using SCOPUS and Google Scholar database, this paper examined trends of karst research in Indonesia. The result showed that karst related publications have shown to be increasing from 1994 to 2010, and grow more massively after 2010. Also, the publications can be classified into 1) conservation and biodiversity, 2) geophysical studies of karst, 3) environment and resource management, 4) forestry and agriculture, 5) archaeology and prehistoric life, 6) socio-cultural and education aspects. A wide gap occurred in research about conservation strategies at a more comprehensive and integrated scale, such as in a landscape, that takes a multidisciplinary and transdisciplinary approach at achieving sustainability. In terms of environmental education, the use of karst as a natural laboratory remained limited in subjects. Yet, it had excellent potential to be developed as a model for a multidisciplinary and transdisciplinary approach to environmental studies, to achieve the goal of Education of Sustainable Development (ESD).
The influence of connecting, organizing, reflecting, and extending (CORE) learning model toward metacognitive abilities viewed from students’ information literacy in physics learning
Authors: Diani Rahma , Susanti Agus , Lestari Neneng , Yuberti  , Saputri Melisa , Fujiani Dwi 
Published: March 2021

Abstract
The term metacognitive behavior describes the habits of students in solving problems which refers to how well they organize their learning systems. This study tried to apply a learning model that can improve metacognitive abilities classified based on students’ information literacy. The research method used was a 2 x 2 factorial quasi-experiment with a non-equivalent control group design. The simple random sampling technique was used as the sampling technique. The experimental class consisted of 30 students taken from class XI MIA 8 while the control class consisted of 30 students taken from class XI MIA 6. The research instrument was a test in the form of essay questions to measure students’ metacognitive abilities. Information literacy questionnaires and observation sheets were employed to see the implementation of the CORE model. Based on the results of the hypothesis test, it was found that there were differences between high information literacy in the CORE learning model and high information literacy in the PBL learning model, there were differences between the low information literacy in the CORE learning model and the low information literacy in the PBL learning model, there were differences between the high information literacy in the CORE learning model and the low information literacy in the CORE learning model, there were differences between the high information literacy in the PBL learning model and the low information literacy in the PBL learning model, and there was no interaction between the CORE learning model and information literacy on metacognitive abilities.
Auditory intellectually repetition learning model and trade a problem learning model on row and series algebraic material: The influences on numerical skills
Authors: Syazali Muhamad , Iqoh Ulfa , Mufty Vistania Febiola , Rahmawati Yasinta 
Published: March 2021

Abstract
Mathematics learning is dealing with numerical skills. One way to improve numerical skills is to use appropriate learning models. This study aimed to determine the influence of the Auditory Intellectually Repetition learning model and the Trade A Problem learning model on numerical skills on row and series of algebra. This research was a quasi-experimental research. Hypothesis testing employed a t-test with a significance level of 5%. The test results revealed that the Auditory Intellectually Repetition learning model and the Trade A Problem provided different influences. Based on the results of the study, it can be concluded that the Auditory Intellectually Repetition learning model had a better influence on increasing numerical skills in row and series compared to the Trade A Problem learning model.
Increase Motivation of Student in Vocational High School Using Unity of Sciences-Based Chemistry Books
Authors: Wibowo Teguh , Ningrum Lis Setiyo , Lathifa Ulya , Fibonacci Anita , Zammi Muhammad 
Published: March 2021

AbstractThis study aims to determine the increasing student motivation using chemistry books based on the unity of sciences. This study used pre-experimental design methods by one group pretest-posttest design. The subjects in this study was the class of X-TKR students of SMK Ma’arif NU 1 Semarang. Techniques of data collection used the questionnaire to know the motivation of student. The technique to analysis data descriptive and inferential statistical analysis (paired sample t-test and N-gain). The results showed that there the unity of sciences bassed chemistry books can increase motivation of students. The mean score of students’ motivation of experiment group was better than the control group, each with a value 3.64 and 2.91, tcount20.106 and ttable2.021 (tcount> ttable= 20.106 > 2.021) and N-gain score 0.64.
Developing POGIL-based worksheets of chemistry and unity of sciences
Authors: Zammi M , Khoiriyyah K , Wibowo T , Lathifa U , Fibonacci A 
Published: March 2021

Abstract
The development of POGIL-based worksheets of Chemistry and Unity of Science is an obvious step to reduce the existence of dichotomy on Students of UIN Walisongo Semarang. Media and Learning Sources used have not facilitated students in inquiry and UOS-contained activity. Therefore, the purpose of this research is to produce POGIL-based worksheets on Chemistry and unity of sciences and to decide the worksheets quality. Meanwhile this research method uses Research and Development with 4D by Thiagarajan. Validation sheets and Response Questionnaires are the instruments of Data Collection. The developed Worksheets are validated by material and media experts with the results of validation 89% and 88,33% in which the developed worksheets are valid and proper to be used. Otherwise, the response of students to the worksheets is good with the average percentage of questionnaire results 83,46%, the worksheets do not need to be revised. Hence, the proper-developed worksheets are used as the supported learning media for students.
Mathematical Study: The consumer price index in the expenditure sub group using factor analysis
Authors: Siswanah Emy 
Published: March 2021

Abstract
Inflation is very important monetary event and is often found in almost all countries in the world. In this research, it will be known what factors influence the inflation rate of Central Java in 2019. The method used is the Factor Analysis method with the Principal Component Analysis technique. Factor Analysis is one of the interdependent multivariate analysis techniques by reducing data to create a new variable (called a factor) and conducting an independent variable analysis into variables that correlate with other variables in the factor. The results of this factor analysis research, obtained two factors formed from 11 variables (expenditure sub-groups) with the largest contributor to inflation in Central Java in 2019. Factor 1 consists of Preserved Fish variable (X

1
), vegetables variable (X

2
), Fruits variable (X

3
), Seasonings variabel (X

4
), and Non-Alcoholic Drinks variabel (X

5
). Furthermore, this factor is named foods and beverages factor. Meanwhile, factor 2 consisted of Tobacco and Alcoholic Beverage variable (X

6
), Household Management variable (X

7
), Education Services variable (X

8
), Educational Equipment variable (X

9
), Courses/Training variable (X

10
), and Support Facilities for Transport variable (X

11
), was then given the name of the Tobacco, Services and Facilities factor.
Alternative ways to handle missing values problem: A case study in earthquake dataset
Authors: Fakhruddin Muhammad , Syazali Muhamad , Pradana Kenny Candra 
Published: March 2021

Abstract
Dataset is a basic foundation that is often used in understanding a problem. It provides information for researchers to get solutions to the problem. In the data retrieval process, some errors may occur and cause the data to be incomplete for any reason. It was a problem in how to recover the missing values in a dataset. The first step is to look at the characteristics of the data. In this paper, we proposed three alternative ways to obtain the missing values of the dataset. In this case, we used the earthquake dataset that has special properties. We then present the results to see the performance of the proposed methods. The results show a good agreement for the missing data. This is a preliminary result of our research related to missing data in the earthquake dataset. This study has some limitations such as if the missing values occur in a large enough data block, the methods need to be improved.
Synthesis and characterization microwave absorber properties of La0.7(Ca1-xSrx)0.3MnO3 prepared by Sol-Gel method
Authors: Admi R I , Saptari S A , Tjahjono A , Rahman I N , Adi W A 
Published: March 2021

Abstract
In this research, structural engineering of lanthanum-manganate-based material was studied, starting with material synthesizing La0.7(Ca1-xSrx)0.3MnO3 with variation of x=0; 0.1; 0.2; and 0.3 using the sol-gel method as a microwave material. The effects of Sr substitution on the stucture, size of grain, and microwave-absorbing properties were investigated in detail by various analytical methods. Using XRD (X-Ray Diffraction) showed that the sample had single phase and orthorombic structure (space group of Pnma), substitution of Sr2 + ions did not cause changes in structure. Characterized using SEM (Scanning Electron Microscope) showed change in grain size which increase when given Sr substitution. Characterized using VNA (Vector Network Analyzer) in the 8-12 GHz range shows that the sample La0.7(Ca1-xSrx)0.3MnO3 with x=0 has been able to absorb up to 55.64% microwaves at 10.44GHz. The study concluded the material of La0.7(Ca1-xSrx)0.3MnO3 have a good potential to be a candidate of microwave absorbing materials.
Inventory and identification of geodiversity to support geotourism in the Lenggoksono bay area of South Malang, Indonesia
Authors: Susilo A , Haji A T S , Suharto B , Sunaryo  , Suyadnya I W , Pramais C W , Rahman A H 
Published: March 2021

Abstract
Lenggoksono Beach Area which is a geomorphological region in the form of karst mountain located in the south of Malang Regency. This beach has beautiful scenery and presents unique and an interesting geosite conditions to be enjoyed. The purpose of this study is to inventory geodiversity data to fulfill the geotourism criteria and assess geodiversity data in the Lenggoksono Bay Area. The research method used was a survey and data collection method with 5 stages: data collection, criteria, assessment, interpretation, and clustering. The Lenggoksono Bay area has 5 landscapes, 4 beaches, islands, hills, and a river estuary. From the survey results, 6 types of rocks were found. Lenggoksono Bay was formed through the process of lifting the seabed containing limestone and coral reefs and igneous rock deposits over millions of years ago. These processes form the morphology and structure that has developed until present. The Lenggoksono Bay area has high value (4.4), where it contains scientific records, specific geological settings or landscapes. This is very meaningful, as an evidence of important geological events, and has special ecological functions that can be utilized for research, education, understanding of geological processes, and conservation. This area includes areas that comply the criteria to become geotourism.