bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluation of implementation practices of industrial field on revitalization of the vocational educational institution in the industrial revolution 4.0
Authors: Matondang Zulkifli , Sitompul Harun
Published: June 2020

The purpose of this study is to revitalize at the Vocational Education Institution (VEI), Engineering Faculty, Medan State of University (EF-MSU). The revitalization carried prepare graduates to compete in globally in the 21st century and the industrial revolution 4.0. One of the programs the VEI is an integrated collaboration with the Business and Industrial World (BIW). The implications of the collaboration between EF-MSU and BIW can be done by the practice of the industrial field (PIF). The output of this research is to form an integrated PIF management model between EF-MSU and BIW and the implementation of PIF becomes more effective. The evaluation of the implementation PIF with the CIPP models (Content, Input, Process, and Product) developed by Stufflebeam. Research subjects were respondents who were related to PIF, namely: students, supervisors, program study leaders, and BIW parties. The stages of the research were starting from the preparation of instruments, determining the source of data (research subjects), conducting a survey about BIW, establishing cooperation with BIW (making MoU), and conducting several focus group discussions (FGD). The FGD is carried out in the context of developing PIF guidelines, which include: planning, implementation, mentoring, reporting and evaluation PIF. The data analysis technique was descriptively and qualitatively. The results showed that the management of PIF at EF-MSU, in general, needed improvement. The form of cooperation undertaken by EF-MSU with BIW in the implementation of PIF is still normative and partial. There is a unit that manages of PIF at EF-MSU. Based on the results of data analysis, it requires a unit of PIF management at EF-MSU, so that the implementation of PIF more planned and effective.
Spatial modeling of poverty level in Kepulauan Bangka Belitung province
Authors: Perdana Hutapea Andre Ridho , Priyo Utomo Agung
Published: June 2020

Poverty is still the biggest problem in the world, including in Indonesia. Based on BPS-Statistics data, in 2017, there are 10.64 percent or about 27.77 millions of Indonesian people are poor. One of the regions in Indonesia that experienced a significant slowdown in poverty reduction is Kepulauan Bangka Belitung Province. Differences in characteristics between regions in Kepulauan Bangka Belitung allow poverty levels to have different causal factors in each region. This study aims to identify and analyze variables that affect poverty levels in Kepulauan Bangka Belitung Province by considering differences in characteristics between regions. The unit of analysis in this study is the sub-district and analyzed using the Geographically Weighted Regression (GWR) model. This study uses data of 6,523 households from all regencies/cities in Kepulauan Bangka Belitung Province, which collected from the field study by students of Politeknik Statistika STIS in 2017. The results of the analysis show that the effect of education levels, health conditions, unemployment rates, the agricultural sector, and labor productivity on poverty levels varies spatially. These results indicate that handling of the poverty problem should pay attention to differences in characteristics between regions (sub-districts).
Prediction algorithms to forecast air pollution in Delhi India on a decade
Authors: Taufik Muhamad Rifki , Rosanti Eka , Eka Prasetya Tofan Agung , Wijayanti Septiarini Tri
Published: June 2020

According to the WHO Global Ambient Air Quality Database in the past two years, there are more than 4300 cities and settlements in 108 countries where have nearly doubled, especially in Delhi, India. Preventing unwanted events is a mandatory crucial step by forecasting air pollution identifying air quality levels and recognizing the associated health impacts. Aim of this paper to forecast air pollution using four prediction models i.e. Naïve Bayesian, Auto Regressive Integrated Moving Average (ARIMA), Exponential Smoothing, and TBATS. The data were obtained from the official website of the Indian government where this research analyzed time-series data from 2005-2015 consisted of PM10, SO2, and NO2 with time variables day, month, and year. The time series set was managed to be monthly in ten years. Moreover, the series was split into a training set and testing set with a ratio 75:25. The training set was utilized to build prediction models and the testing set would evaluate forecasting results. Forecasting results showed all models gave acceptable prediction and according to the error, the ARIMA and exponential smoothing models were the potential prediction model for air pollution data.
Performance of robust EWMA control chart for variability process using non-normal data
Authors: Prabawani N A , Mashuri M , Irhamah
Published: June 2020

The main purpose of quality control is to quickly detect the presence of assignable causes and shifts in the process so that an investigation of the process can be carry out as early as possible. The Shewhart control chart provides good performance when the observation data is normally distributed, whereas when the normality assumption is not met, a Robust control chart is needed. The performance of the control chart depends on the stability of the estimator used to estimate the process parameters and establish control limits in phase I. In this study, a Robust Exponentially Weighted Moving Average (EWMA) control chart will be present to monitor process variability using one of estimator Robust scale to estimate standard deviation. This estimator is used to develop robust control limits. Then evaluate the control chart performance using Average Run Length (ARL) and Standard Deviation Run Length (SDRL) with Monte Carlo simulation. Furthermore, the robust chart was applied to monitor the quality characteristics of the number of bacterial colonies in each aquaculture medicine product. The results obtained in this study are formed a control chart that is resistant to the existence of outliers and sensitive to shifts in the process of variability.
A comparative study for Bitcoin cryptocurrency forecasting in period 2017-2019
Authors: Septiarini Tri Wijayanti , Taufik Muhamad Rifki , Afif Mufti , Rukminastiti Masyrifah Atika
Published: June 2020

The objective of this study were (i) to construct the classical statistic and artificial intelligent model for predicting bitcoin cryptocurrency, and (ii) to compare the predicting performance by using root mean square error (RMSE) and mean square error (MSE) as forecasting evaluation tool. The observation data used in this study were collected during January, 5 2017 to October, 1 2019 (in total 1,000 daily observation data). The statistical method used in this study were ARIMA (Autoregressive Moving Average) and Exponential Smoothing. The artificial intelligent model were used in this study were fuzzy time series and ANFIS (Adaptive Neuro Fuzzy Inference System). The partitions data set were of 75%-25% of training and testing, respectively. The cryptocurrency investigated was bitcoin (BTC) which is the top three of most widely traded cryptocurrency. The forecasting results show that the classical method has the smallest value of RMSE and MSE which is exponential smoothing with 9749.81 for MSE and 98.74 for RMSE. However, the performance of forecasting method cannot be guaranteed from either classical or modern forecasting method. Analyzing with different method can be considered for future study, for example machine learning, neural network, modified fuzzy time series, etc.
Ethnobotanical study of Kumpai Babulu (Paspalidium punctatum) to community of watermelon farmers in Palangka Raya
Authors: Ayatusaadah  , Mulyono Yatin , Handayani Isnaini Siwi , Ulfa Anna Vania , Qamariah Zaitun
Published: June 2020

The purpose of this study is to contribute to the development of knowledge-based on local wisdom by describing the origins and techniques of using Kumpai Babulu grass (Paspalidium punctatum), botanical description and its importance to the community of watermelon farmers in Bangaris, Palangka Raya. This study uses descriptive qualitative methods with three stages; preliminary study, ethnobotanical survey and data collection. Data collection was carried out through 4 research instruments which consist of observation, interviews, documentation and literature study. The data obtained were analyzed descriptively with validity techniques using data triangulation. The results showed that the community of watermelon farmers in Bangaris-Palangka Raya, Central Kalimantan have cultivated Kumpai Babulu (Paspalidium punctatum) as an organic mulch in watermelon farming, a technique used as a legacy from generation to generation from their hometown, Negara, Hulu Sungai Selatan, South Kalimantan. They have utilized two techniques in processing Kumpai Babulu mulch, by spraying herbicides and rolling techniques until the grass dries and is ready to be used as mulch. Watermelon farmers’ community in Bangaris were also utilizing these species as animal feed and organic fertilizer. This shows that Kumpai Babulu (Paspalidium punctatum) has an important role, especially for the economy of the community.
The role of performance and self-assessment to determine students’ science process skills in SMP Negeri 11 Kota Tangerang Selatan
Authors: Sejati F U A K , Saputro S , Indriyanti N Y
Published: June 2020

This study aims to describe the pattern of students’ scientific processes based on observations when performance appraisals are carried out. Science process skills are assessed using performance indicator instruments and supported by student self-assessment instruments. The research method used in this research is descriptive analysis. Data collection instruments in this study were observation sheets, student worksheets, and self-assessment sheets. Research subjects were 38 students of grade seventh in SMP Negeri 11 Kota Tangerang Selatan. The results of the study showed from 3 out of 10 aspects of observed skills that still score below 80%. These aspects were aspects of asking (75%); apply the concept (77.7%), and communicate the results (65.5%). However, three aspects have been in the good category. The aspects of science process skills with 100% value owned by students are aspects of prediction and hypothesis formulation. There are two aspects of science process skills that have opposite results from the results of students’ self-assessment, namely aspects of developing hypotheses and communicating. Hypothesis aspect in self-assessment has a value of 79%, this is contrary to the results of observations using performance appraisal. In addition, the aspect of communication in self-assessment also has the opposite results from observations in a performance evaluation that is equal to 89%. Even so the category of science process skills possessed by students in the assessment of performance indicators and self-assessment included in both criteria.
Effectiveness of air filter equipment based on water Hyacinth on combustion smoke
Authors: Sari Lindah Permata , Suparno  , Fatharani Mirra , Pahlifi Dwi Maihidin , Adrizal Mohd. , Luliyanti Dian Sukma
Published: June 2020

Indonesia as an agrarian country has a variety of plantation plants. The oil palm plantations are widely spread on two islands of Indonesia namely Sumatra and Kalimantan. In these two areas, there is a risk of being affected by the haze disaster. Forest and land burning smoke contains carbon dioxide gases (CO2), carbon monoxide (CO), hydrocarbon (HC) and particles. This study aims to determine the effectiveness of air filter device using water hyacinth cellulose material in combustion fumes. The air filter was filled with a solution of water hyacinth cellulose with variations in concentrations of 5%, 7.5%, 10%, 12.5%, 15%, 17.5%, 20% and 22.5%, 40% NaOH solution and 10% zeolite solution. Filter device were tested by using a gas analyzer. The gas levels of CO2 and HC in combustion fumes were 5.82 vol% and 126 ppm vol. The test results showed that the device could reduce the levels of carbon dioxide (CO2) and hydrocarbons (HC) in combustion fumes. The most effective device was used to reduce CO2 gas by using 20% cellulose solution where the effectiveness of the device was 100%. The most effective device was used to reduce HC gas by using 22.5% cellulose solution where the effectiveness of the device was 90.48%.
The role of students’ critical thinking skills in junior high schools on chapter organism and its environment
Authors: Ratnasari Novita , Sarwanto  , Adi Prayitno Baskoro
Published: June 2020

Thinking skills, especially critical thinking skills are complex skills currently needed by every individual to analyze personal and social problems that exist in the environment with a broad and detailed format. This study aims to analyze and classify the students’ level in constructing critical thinking. The subjects of the study were 20 students of class VIII B MTs PSM Tanen Rejotangan Tulungagung in academic year 2019/2020. Data were collected through interviews and tests of critical thinking skills. The critical thinking skills test instrument consists of 10 essay questions, including 6 indicators. The test instrument used has been tested as valid and reliable as a measuring instrument. Test was validated by experts and the results of the validity, reliability, difficulty index and discrimination power levels were determined as a good test instrument to use as critical thinking skills test for students. The analysis was conducted on the results of students’ tests and categorized into five categories of critical thinking skills, consisting of very good (VG), good (G), medium (M), less (L) and very less (VL). The results showed that 75% of students had critical thinking skills with very less categories (VL) and 25% of students had less categories (L) in critical thinking. The average score of the highest critical thinking indicators obtained in the explaining indicator is equal to 41.5. The indicators analyzing have the lowest average score of 9. The results show that students’ critical thinking skills still need to be improved for future study.
The magic of local plants for the community prosperity and the economics of Argosuko village
Authors: Indriwati SE , Baidlowi H , Fanani L , Sulasmi ES , Lestari SR , Priambodo B
Published: June 2020

Village areas that classified as the poor or undeveloped places usually characterized by the majority of the population as farmers. The large population of farmers makes them have many of the plant commodities that can be used as medicinal plants or others such as drying to be simplicia. Simplicia is a dry form of the plant parts such as from seed, branch, leaf, root, flower or the fruit. Therefore, this research purposed to know the diversity of local plants that have a potency to be an additional income for local people of ArgosukoVillage, Poncokusumo District, Malang and also to improve and educate the local people on how to process the plant to be a simplicia. The result showed that there are 30 species of plants that have the high potency to be converted into simplicia. Besides the plant species survey, We also give knowledge about simplicia on how to process, how to package the products, and also how to make a license their products from simplicia. The high opportunity of Argosuko Village to improve their prosperity and economy are widely open, supported by the availability of materials (local plants) and the willingness of Argosuko people to trade its products. For further study we arrange to analyze the local plants ingredients in Argosuko Village to strengthen product licensing.
Improving students’ critical thinking skills through natural science learning website
Authors: Utami V A S , Djukri
Published: June 2020

This study aims to determine the improvement of students’ critical thinking skills through a natural science learning website. The subject of the pre-experimental study is 64 junior high school students of grade 7th that is divided into two classes (32 students in the class D, Grade 7th, as experiment class and 32 students in class B, Grade 7th, as a control class). This study is placed at the 4th Pakem State Junior High School – Yogyakarta. Sampling technique that is used in this study is purposive sampling. The data was collected by using pre-test and post-test. The data was analysed by using paired t-test and N-gain score to see the effectiveness of the natural science learning websites to increase the students’ critical thinking skills. The results which are showed by using the natural science learning website has a significant effect on students’ critical thinking skills with the value of significant (α) 0.00 < 0.05 while the N-gain score is 0,87 that is included in the medium category. It can be concluded that natural science learning websites can increase students’ critical thinking skills.
Global warming & climate change: integration of socio-scientific issues to enhance scientific literacy
Authors: Widiyawati Y.
Published: June 2020

Global warming and climate change are some of the greatest socio-scientific issues in recent decades. Many factors contribute to these issues, the footprint of human activities as well as natural phenomena. Human energy consumption in many sectors i.e food supply, livestock, industry, and transportation significantly increasing earth surface temperature average level and climate change. Various studies were carry out about global warming and climate change interdisciplinary. Integration of these socio-scientific issues into science learning as an effort to educate and enhance student environmental awareness and scientific literacy is necessary to do. Rational of this article is to studies global warming and climate change topics from integrative science context; biology (microbial activities, ruminants, and environmental impacts), chemistry (the various chemical reaction that causes greenhouse gases and global warming), and physics (temperature, heat, and global climate). This study is urgent because microbial activities that contribute into greenhouse gases releasing in ruminant enteric fermentation process haven’t included and connected yet in Indonesia’s science learning. Ruminant should be highlighted in these issues because Indonesia is an agricultural country which has enormous farmhouse area. In addition, students are expected to be able to solve problems and make the right decisions related to these issues. This article will discuss suggestion global warming and climate change topics in terms of microbial activities, ruminant and mitigation strategies to reduce GHG from livestock sector. This suggestion is expected to meet the Sustainable development goals.
Hypergeometric method for Klein-Gordon equation with q-deformed quantum mechanics on coulomb potential
Authors: Suparmi A , dan C Cari Dyah Ayu Dianawati
Published: June 2020

Hypergeometric method was used to obtain the solution of Klein-Gordon equation with q-deformed quantum mechanics for Coulomb potential. By introduction the new variable and parameters in the Klein-Gordon equation, then Klein-Gordon equation reduced to the second order differential equation of Hypergeometric function. From the solution of the Hypergeometric differential equation, the energy and wave function equations were obtained analytically. The energy was numerically calculated by Matlab R2013a software and the first three wave function was obtained. The result shows that the decrease of quantum deformation caused the increase of the energy eigen value, and the increase of quantum number caused the increase of the energy eigen value too.
Development of physical practicum tools to determine the refractive index through measurement of real depth and apparent depth
Authors: Jaladri Effilia Allun , Nursulistiyo Eko
Published: June 2020

This study aims to develop and determine the feasibility of a physics practicum tool to determine the refractive index of fluids through measurement of apparent depth and real depth. The product development method used in this study was Research and Development (R&D) with the ADDIE model. The results of this study, the refractive index of water isn = (1.3158112 ± 0.0000303)with a relative error of 1.07%, the refractive index for saltwater isn = (1.4476904±0.0000387)with relative error by 1.37%, the refractive index for sugar water isn = (1.355680±0,000145)with a relative error of 1.02%, and the refractive index for cooking oil isn = (1.4525593 ± 0.0000694)with a relative error of 1.36%. The results of the feasibility test of media experts, material experts and users for practicum tools and practicum guides were 90.69% which included in the Very Good category, 94.17% which was in the Very Good category, 90.62% which was in the Very Good category. Based on the results of these percentages, the practicum tools, and the practicum guides are declared to be suitable as learning media on Optics Geometry material, especially for the determination of the refractive index with real depth and apparent depth.
Profile of students’ critical thinking processes on the topics of Hydrostatic Pressure and Archimedes’ principle
Authors: Rosyidah N D , Kusairi S , Taufiq A , Affriyenni Y
Published: June 2020

In learning physics, students often have difficulty in understanding concepts. This certainly has an impact on students’ critical thinking skill. This study aims to analyze students’ critical thinking skills related to the concept of hydrostatic and Archimedes’ principle. This research was conducted using a qualitative descriptive design. The research subjects were students of class XII MIPA in Malang (N = 127). Data collection was carried out through a series of tests in the form of essay and interview questions. The indicator used to create critical thinking questions refers to the five main perspectives presented by Hughes. The results show that the majority of students have relatively low critical thinking skill. It is shown by the average score of critical thinking skill of students which only reached 36.1 from the maximum score of 90. The main cause of the low critical thinking skill of students was the presence of misconceptions experienced by students. The low critical thinking process of students are also caused by students have not yet accustomed to applying the concepts of physics in daily life.
The Phenomenon of existence Batu Angus on the eastern slopes of mount Gamalama Ternate island North Maluku
Authors: Awal Samsi , Kamur Sudarwin , Ajid Fahririn
Published: June 2020

This study aims to determine the process of the formation of Batu Angus and the type of Batu Angus on the East Slope of Mount Gamalama Ternate Island, North Maluku. This research is a type of qualitative research that reveals how the process of the formation of Batu Angus and the types of rocks of Batu Angus Mount Gamalama. The research data was collected through interviews, observations, and petrographic laboratory analysis. The research data were analyzed using a polarization microscope to determine the type of Batu Angus Mount Gamalama. The results showed that the process of Batu Angus formation on the eastern slope of Mount Gamalama was initiated by an effusive volcanic eruption in 1907 in the form of lava flowing down the slope which took place in the northeast part of Mount Gamalama and piled up in the Kulaba village. Based on the results of the petrographic analysis in the laboratory, it was obtained the results that Batu Angus contained Plagioclase minerals, Pyroxene, Opaque minerals, and Glass minerals, so that it can be concluded that Batu Angus is one of the Andesite Pyroxene igneous rocks.
Evaluation of the fractionation process on aviation turbine fuel production using nuclear technology
Authors: Wibisono  , Ningsih F R , Septian H , Ragaguci
Published: June 2020

The role of nuclear technology not only for electricity as clean energy but also for a tool to evaluate the process in the refinery unit. Fractionation columns are designed to achieve the required separation of fluid mixtures or miscible liquids efficiently. A troubleshoot was reported on aviation turbine fuel production in the refinery unit. Due to this report, an evaluation was performed at fractionator for aviation turbine fuel production to investigate suspected areas. The specification of the unit is height of 44.4 m, internal diameter ID: 4.4 m, and consists of 52 trays, three accumulators, nine platforms. The radiation is collimated and assumed by a point source meanwhile, detector is given a panoramic window. Radiation counting in every point with step 50 mm to gain quantitative data regarding process inside the column. The nuclear technology has successfully revealed the troubleshooting column by the principle: attenuation radiation. Basically, attenuation value depends on the material which penetrated by gamma-ray. Based on six orientation the experiment successfully found flooding cases, misorientation trays, and dried chimney. Overall, the analysis proof that nuclear technology is suitable to be one of non-destructive methods in industrial scale. Future study is to provide three dimensional image by combining tomography and gamma scanning technique.
Revisiting the roles of educational robotics in improving learners’ computational thinking skills and their positive behaviour
Authors: Massaty Muhammad Hassan , Budiyanto Cucuk Wawan , Tamrin AG
Published: June 2020

This paper investigates the relationship between the use of robotics in learning towards self-efficacy and computational thinking skills. This paper also examines whether there is a relationship between computational thinking skills and self-efficacy. This paper employed a systematic literature review method by examining forty articles drawn from ‘computational thinking’, ‘self-efficacy’ and ‘educational robotics’ keywords in the literature. The majority of research indicates that the use of robotics in learning facilitates the development of computational thinking skills as well as learners’ self-efficacy. The paper advocates that future research should examine the extent of computational thinking skills and self-efficacy influence on student behavior.
Analyzing mathematical connection skill in solving a contextual problem
Authors: Ayunani D S , Mardiyana  , Indriati D
Published: June 2020

Mathematical connection skill is needed by students to connect mathematics theory and contextual problem solving. As state, in NCTM that the mathematical connections skill is one of the four competencies needed to face the industrial revolution 4.0. According to NCTM, there are three mathematical connection skills, namely modeling problems, applying obtained concepts and procedures also expanding mathematics ideas. The purpose of this study was to describe the class X student’s mathematical connection skill at Boyolali High School, Central Java in doing a contextual problem in one variable linear inequality. This research was a comparative descriptive study with qualitative methods involving 15 students from 5 schools as participants. The results showed that students’ mathematical connection skill is still low. We saw this from the indicators showed that the students were unable in modeling the contextual problems correctly, students were not able in applying the obtained the concepts and procedures also getting difficulty in expanding mathematics ideas.
The effect of STEM-based (Science, Technology, Engineering, and Mathematics) learning model toward the students’ mathematical problem-solving ability in SD Muhammadiyah Condongcatur, Yogyakarta
Authors: Pasaribu K A , Suyanto W
Published: June 2020

This study aims to determine (1) the students’ mathematical problem-solving ability taught using STEM-based (Science, Technology, Engineering, and Mathematics) learning model, (2) students’ mathematical problem-solving ability taught using expository learning models, (3) whether there is a difference in the effect of STEM-based learning model with expository learning models in improving students’ mathematics learning achievement. This research was an experimental research design with quasi experimental design (Quasi Experimental Design). The population in this study was all grade V SD Muhammadiyah Condongcatur Yogyakarta. The sample in this study was class V-1 as an experimental class with 33 students and class V-2 as a control class with 33 students. The findings in this study indicate that the class taught using STEM-based learning model has Mean 31.9697 and the class taught using the expository model has an average value of 28.5758. The results of the hypothesis test show that Tcount> Ttable is 2.925> 1.996 with the conclusion that the mathematical problem-solving ability of students taught with STEM learning model is better than the class which is taught with expository learning models.
Analysis of students’ critical thinking skills on chapter of motion of objects and living things
Authors: Najaah L. S. , Sunarno W. , Sukarmin
Published: June 2020

This study aimed to analyze the ability of students to think in critically analytical and evaluative ways on chapter of motion of objects and living things. The object of the study was 280 students of 8thgrade of MTs Negeri 1 Wonogiri in the academic year 2019/2020. This study used descriptive qualitative method to describe students’ critical thinking skills. Data was collected using reasoned multiple choice test which was developed based on skills of critical thinking according to Facione’s theory. As a result, it can be concluded that the criteria of the analysis and inference ability of the students were lack. While the ability of interpretation, evaluation, explanation, and self-regulation were in the very lack criteria.
Obstacle on The Implementation of The Scientific Approach to The Curriculum 2013: a Case Study of Lesson Study in Palangka Raya City
Authors: Nasir Muhammad , Nastiti Luvia Ranggi , Yuliani Hadma
Published: June 2020

One of the backgrounds changing of the curriculum 2013 was in response to the low literacy of Indonesian children according to PISA and TIMSS test results. To overcome this problem, the government adopted a policy of implementing a scientific approach in schools. The purpose of this study was to explore the obstacles faced by science teachers in applying scientific approaches in schools. Data collection techniques using questionnaires, observations, and focus group discussion. The results of the research showed that (1) Lesson study can improve teacher’s pedagogical competence in applying scientific approaches, (2) The main obstacle of teachers was the lack of time in carrying out the process of scientific approach in learning, especially at the stage of conducting experiments, (3) Lack of time preparation for national and entrance examinations to higher schools. It was concluded that although lesson study was effective in increasing the ability of teachers to apply scientific approaches, but they are reluctant to apply it because they were afraid of running out of time in conducting the experiment and achieving their national final exam material targets when a scientific approach was applied.
Teacher’s question in the stage of solution presentation and reflection problem-based learning for increasing valid relationship score on concept map
Authors: Untari S A , Widoretno S , Saputra A , Sajidan
Published: June 2020

The aim of the research is to measure the increase of valid relationship (VR) concept map (CM) scores using a teacher’s question in the stage of solution presentation and reflection problem-based learning. The research is a classroom action consisting of pre-cycle, cycle I, and cycle II. The research procedure included planning, implementing actions, observations, and reflecting on 36 high school X grade students. The research data was VR scores calculated based on expert CM, supported by syntax implementation and performance assessment. Validation of data used triangulation methods which confirmed VR scores with documentation and interviews. The data analysis used data reduction, data presentation, and conclusion. The results showed that the number of students who has an increase in VR scores in linear, trend, and fluctuating fashion as follows: 44,44%; 22,22%; and 33,33%. The teacher’s question in the stage of solution presentation and reflection increased VR scores, therefore the teacher can apply the action to train student’s ability to connect concepts in class.
The certainty of Response Index (CRI) and scale of honesty to identify student misconceptions
Authors: Firmasari S , Nopriana T
Published: June 2020

Research related to the identification of misconceptions has been carried out by some researchers, notably using the CRI scale (Certainty of Response Index). But there were no results that underline misconceptions by using a scale of honesty. This study aimed to identify misconceptions on relations and functions at Basic Math Capita Selecta subject using CRI and Honesty Scale. The study used survey methods, the instrument used was a questionnaire scale CRI, honesty scale questionnaire and interview guidelines. The results showed that: 51,32% student understand the concept; 12,63% high guess element of the correct answer; 16,32% are misconceptions; and 19,47% did not know the concept. Based on the results of the honesty scale which was strengthened by interviews, it is shown that students were wrong in understanding the concept of the relation of functions for a one-to-one correspondence between two sets, and wrong in determining the function of the graph. With the results of this identification, enables teachers to provide reinforcement for students who were still weak at a concept to provide a review of the material.
Effectiveness in mathematics learning with the problem solving approach in vocational high school
Authors: Sriatun  , EkoHariadi  , Sondang Meini , Winanti Titiek , Ismayanti Euis , Nurlaela Luthfiyah
Published: June 2020

Creative teachers are the key to the success of vocational learning in the XXI century. One of the learning models applied to vocational learning is a problem solving or problem solving learning model. The purpose of this study is to describe the effectiveness of vocational mathematics teachers in the learning process with problem solving models in terms of their application, as well as an overview of problem solving skills of vocational high school students. The main instrument of this study was the research themselves assisted with problem solving questions, questionnaires and observation sheets. The results showed that the aspects of learning planning preparation had shown to be effective, but there were still less effective indicator, namely the preparation of worksheet and the use of teaching aids. The category of problem solving abilities of vocational high school students in understanding the problem on average is quite good. But the indicator verifies the results of the answers including the less category.
The effectiveness of conventional and inquiry learning methods in improving student learning achievement
Authors: Wulandari T , Kartowagiran B
Published: June 2020

The aims of this study are to find out: (1) student learning achievement taught by the Inquiry method, (2) student learning achievement taught by Conventional methods, (3) differences in student learning achievement taught by the Inquiry method and student learning achievement taught by Conventional Method. This research is a quasi-experimental research. The population of this study was all students of class X of the Islamic Senior High School in Kabanjahe, totaling 179 students. The sample of this study was students of class X-2 consisting of 37 students. The instrument in this study was a multiple choice test that was carried out before learning (pre-test) and after learning (post-test). Based on the results of the t test, found that t count > t table ( 4.924> 1.667), there was a significant difference in students’ mathematics learning achievement. Mathematical learning achievement of students using the Inquiry Method is greater than student learning achievement using Conventional methods.
Structural Transformation of The West Java Economy and Its Agriculture
Authors: Sulistyowati Lies , Novitasari Riska , Trimo Lucyana
Published: June 2020

The role of the agricultural sector in economic development in West Java is not only seen from the production and employment, but also from its contribution to the formation of the GRDP. However, the development of economic growth in West Java has changed from year to year, including the agricultural sector where there is a shift in the share of output value which causes a decrease in the contribution of the agricultural sector without causing a decline in the value of output from the sector. This study aims to examine the shift in the agricultural sector in the economy in West Java. This study uses a quantitative descriptive method with secondary data in the form of national GDP data and West Java Province GDP according to business in 2013-2018 based on constant 2010 prices. The results of this study indicate that the growth of the agricultural sector in West Java is positively influenced by national economic growth. Growth in the agricultural sector is relatively slow and has no competitive advantage, with a change rate of 2.80 percent. In addition, the agricultural sector in West Java also does not specialize in location effects, except in the food crops and horticulture subsectors.
Estimation and Correlation of Surian Leaves (Toona Sinensis) Weight with the Tree Parameters
Authors: Lastini Tien , Hernawan Endang , Rosmiati Mia , Putra Ramadhani E , Rahmayunita Ira
Published: June 2020

Leaves of surian tree (Toona sinensis) based on the research, can be used for medications, such as diabetes, cancer, and others. At the present the people is being switched from chemical drugs to herbal medicines. Therefore, surian leaves is one source of herbal medicine to be developed in the future. However, information of leaves biomass in each tree relating to ages and tree parameters is unknown. This study aims to determine the weight of surian leaves on each tree and to examine the relationship of leaves weight with several tree dparameters. The study was conducted on private forests in Sumedang District. The sample of 110 trees were taken purposively. Tree parameters were measured, namely: Diameter Breast Height (DBH), total height, timber height, crown height, crown diameter, age, and leaves weight of each tree. The results of the correlation analysis showed that there was a significant relationship between four parameters of the tree, namely DBH, total height, crown height, and crown diameter with surian leaves weight. The highest correlation with the weight of surian leaves is DBH, amounting to 0.75. Estimated weight of leaves in DBH 10-19 cm is 8-11 kg/tree. Whereas for DBH above equal to 20 cm is 18-23 kg/tree.
Growth and yield responses of three accessions of Centella asiatica grown in lowland under varied watering intensities
Authors: Wulandari S , Widyastuti Y , Pardono  , Yunus A
Published: June 2020

C. asiatica presented the best vigor when planted at an altitude of 2500 meters above sea level. Drought is the main environmental stress in C. asiatica cultivation. The objective of this study was to determine which accession of C. asiatica that grows and produces optimally under stressed conditions since no known accession can grow optimally with various drought stresses. The study conducted in a screen house, Jumantono, Universitas Sebelas Maret Surakarta, from 4 May to 5 August 2019. The research used a completely randomized design with a variety of C.asiatica accessions (accession 1, 2 and 3) as the first factor and variety of watering intensities (once a day, once every two days, once every three days, and once every four days) as the second factor. The results showed that there was an interaction between accessions and watering intensity only on the number of tillers. Accession 1 was a drought-tolerant accession because it grew optimally in almost all variables. Watering intensity once a day was the optimum treatment for C. asiatica growth.
The Feasibility of Gedong Gincu Mango (Mangifera indica L) Agribusiness by Using Off - Season Technology
Authors: Umyati Sri , Dinar  , Castini
Published: June 2020

Gedong gincu mango is a local commodities in Majalengka. The limited supply of Gedong gincu mango as the leading local commodity in Majalengka Regency in off season has influence on demand and income of the farmers. Research to assess the feasibility of the gedong gincu mango agribusiness was conducted using quantitative descriptive methods. The data was collected through a survey using a questionnaire and involved 31 respondents. The observed variables were income and farm analysis with R/C ratio for one season. The results showed that the agribusiness gedong gincu mango in the off season was able to provide an income of Rp. 13.405.860,- (± 100% higher than high season) with an R/C ratio of 1.30. This finding confirms that the off-season Gedong Gincu mangoo agribusiness could increase farmers’ incomes significantly.
Hot Water and Sulfuric Acid Solution for Increasing The Viability and Vigor of Indigofera (Indigofera zollingeriana)
Authors: Fahmi Z I , Purwanto E , Purnomo D
Published: June 2020

Indigofera (Indigofera zollingeriana) is a multi-benefit plant, two of them are for natural dyes and livestock feed supplement. Indigofera seeds are hard and thick-coated so that the germination percentage is low and not grow in simultaneously. This study aimed to obtain an effective and practical method of increasing seed viability and vigor was carried out from March to May 2019 at the BBTP Central Java. The research used a completely randomized design, consisted 9 treatments(control, soaked in hot water by 80 and 100°C then leave it for 24 hours, and soaked in a solution of H2SO495% for 10, 20, 30, 40, 50 and 60 minutes) and 4 replications. The germination method used the top of paper with filter paper media. The results showed that soaking the seeds in hot water and sulfuric acid solutions significantly increased germination, maximum growth potential, vigor index, and growth rate. Soaking seeds in a 95% H2SO4solution for 10 minutes increased the germination of the seeds (84%), maximum growth potential (91%), vigor index (69%), and growth rate by (13.81% etmal−1). The finding concludes that the best treatment was soaking seed in H2SO4solution for 10 minutes, and longer soaking time (> 50 minutes) will decrease all parameters.
Efficiency of Production Factors and Constraints of Organic Rice Farming at Rainfed Rice
Authors: Noormansyah Z , Cahrial E
Published: June 2020

This study aims to determine the efficiency of the use of production factors and the constraints of organic rice farmers in rainfed rice (whose irrigation depends only on rain). The research method used was a case study with 45 farmers as respondents. The level of efficiency of the use of production factors is calculated using Cobb Douglas method and the constraints in the implementation of organic rice farming are analyzed in a descriptive manner. The results showed: 1) Simultaneously, the factors of production used had a very significant influence on organic rice production. Partially, land production factors have a positive and very significant effect, while the factors of production of biological fertilizers and vegetable pesticides have a significant effect on organic rice production. Biological fertilizers are negative while plant-based pesticides are positive. Factors of production that do not significantly affect organic rice production are seeds, organic fertilizer, compound fertilizer, and labor. 2) Factors of land production and vegetable pesticides have not been efficient. While the factors of seed production, organic fertilizer/manure, liquid organic fertilizer, compound fertilizer, and inefficient labor production factors. 3) The major obstacle in the application of organic rice farming in the rainfed rice is the provision of production facilities, with a percentage of 37.80 percent, followed by the role of supporting institutions 34.52 percent.
Morphological Study Of Rumput Mutiara (Hedyotis corimbosa L) From Various Locations In Central Java
Authors: Iswahyudi  , Samanhudi  , Yunus Ahmad , Widyastuti Yuli , Suryanti Venty
Published: June 2020

Indonesia is a country rich in medicinal plants such as rumput mutiara (Hedyotis corimbosa L). To find new sources of medicinal plants as well as trying to cultivate them, rumput mutiara was chosen as study material. To be able to carry out intensive cultivation, morphological studies of the rumput mutiara are needed. Differences in body morphological characters were analyzed using the Statistical Analysis System (SAS) of the third height at different locations. The SAS results showed that the parameters of root length, plant height, segment length, stem diameter, number of branches, leaf width, leaf length and flower stem length showed significant differences between treatments (height). Furthermore, P2 (altitude treatment between 201 to 400 meters above sea level) shows the highest results compared to other treatments.
Chitosan And Composition Media For Improving The Growth Of Seed Sawo (Achras zapota L)
Authors: Yuniastuti Endang , Fiqri Taufiq , Nandariyah  , Indah Delfianti Marshelina Noor
Published: June 2020

The optimal Sapodilla plant is cultivated as a garden plant to enjoy the fruit and the fruit tree is also long-lived. The duration of the brown seed germination (generative) is the influenced by the hard nature of the seed coat so that it is difficult, to penetrate water and oxygen and cause dormancy to occur. The research aimed to determine the effect of immersion with chitosan as a growth regulator and planting media for the effectiveness of the growth sapodilla seeds. The experiment arranged factorially using Randomized Complete Design (RCD) and provided with 3 replication. The treatments consisted of 4 levels of planting media and 4 levels of chitosan concentration. The results revealed that germination of sapodilla were not influenced significantly by chitosan concentration and the media composition. Even though, there was a tendency that germination and the growth of treated seeds with 4 mLL of fitosan were relatively better than control. In addition, the media composition (1;2;1) resulted the relative better of seed growth.
Innovationto speed up the Developmentof Rose Picking Agro-Tourism in Gunung Sari
Authors: Ismail AgusYadi , Nainggolan Mai Fernando , Turnip Arjon
Published: June 2020

Rose picking agro-tourism development playsa significant role in increasing the welfare of famers or rural community. The research of innovation to accelerate the development of RPA was conducted from traditional to modern agro-tourism in Gunung Sari. The approach of The quantitative and qualitative was used by determining 30 respondents purposively using the saturated sampling method. The results showed that the farmers managing the agro-tourism picking roses had gone through the processes of knowledge, persuasion, decisions, implementation, and confirmation before adopting innovation. The factors that influence the farmer implementer in adopting innovation in the development of rose picking agro-tourism are the age and frequency of farmers participating in counseling.
The Prospective Use of Essential Oil from Herbs as Feed Additive for Laying Poultry: A Review
Authors: Widodo E
Published: June 2020

Entering the era of AGP replacer has made researchers to find alternative products which are comparable to AGP. Some attempts have been made, but it seems the use of herb essential oil (EO) to be very prospective. Some commonly used herbs products evaluated are for example cinnamon, aniseed, olive and oregano. The products are often used in the form of essential oil mixture (EOM) rather than single product. This paper aimed to review the utilization of herb EO and ground herb containing EO toward poultry laying performance. The mechanism of action related to antimicrobial action assessed toward the possible improvement in laying performance. It is concluded that the use of herb EO and ground herb containing EO might replace the use of AGP, but it should be carefully done, because the success in improving laying performance is influenced by the type and dose of herb EO and ground herb containing EO used in the feed.