bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Effect of Nutrition Knowledge on Nutritional Status in Sport Science Students
Authors: Siregar N S , Harahap N S , Sinaga R N , Affandi A 
Published: March 2020

Abstract
The knowledge may vary to eating behavior which contributes to nutritional status and performance. Therefore, this study aims to know the relationship between nutrition knowledge and the nutritional status of students in the Sport Science Faculty of Universitas Negeri Medan. The study used a cross-sectional research design. Samples were 27 students in Sports Science. Nutritional knowledge was collected by using the Sport Nutrition Knowledge Questionnaire (SNKQ). Body mass index (BMI) was measured by anthropometry. Data analysis was descriptive and regression analysis. On average, nutrition knowledge score was in poor category whereas the knowledge of a balanced diet was in the good category. Meanwhile, the knowledge of carbohydrates, proteins, fats, vitamins and minerals was in poor category. Whereas water knowledge was in sufficient category. The result shows that 81.5% students have got normal BMI, while 14.5% and 3.7% are in overweight and underweight. The result of regression test shows r = 0.580 with p 0.004<0.005, which means that nutrition knowledge influences nutritional status.
Development of Teaching Materials Based “Activity or Resources” At Sipda Unimed to Enhance Students Learning Behavior
Authors: Darari Muhammad Badzlan , Firdaus Muliawan 
Published: March 2020

Abstract
State University of Medan (red-Unimed) has provided Learning Management System (LMS) for lecturers and students namely Sistem Pembelajaran Daring (Online Learning System) that is abbreviated Sipda. But before using Sipda, lecturers must prepare teaching materials and provide appropriate learning resources. Objectives of this study were to describe the effectiveness of teaching materials based "Activity or Resources" at Sipda Unimed in the mathematics education study program and also to describe changes in learning behavior of students in mathematics education study programs using teaching materials based "Activity or Resources" at Sipda Unimed. This study used Research and Development design with 4-D model. The subjects of this study were students of mathematics education at their third semester who are taking multivariable calculus course. Result of teaching materials validation scaled one to four score showed the average is 3,78. Result of response questionnaire scaled one to four score showed the average is 3,72. Result of learning behavior scaled one to four score showed the average is 3,82. Result of analysis data showed that teaching materials based on "Activity or Resources" on Sipda Unimed are effectively used and have an impact on enhance students learning behavior
Analysis of Calculus Learning Beliefs and Students’ Understanding about Limit of Functions: A Case Study
Authors: Usman  , Bambang RM , Hasbi S, M. , Mardhiah MZ 
Published: March 2020

Abstract
Belief is an individual construction result based on learning experiences. This study aimed to describe students’ calculus learning beliefs and its relations with an understanding of solving limit of functions problems. This study used a qualitative descriptive approach. The subjects of this research were two Mathematics education students of Syiah Kuala University. The data collected by giving calculus learning belief questionnaire, the limit of functions understanding test, and interview guidelines. The data were analyzed by displaying data, analyzing, interpreting, and concluding. The result showed that both students who had high-beliefs in calculus learning were able to solve the limit of functions problems by using concepts, principles, and procedures.
Characterization, Phytochemical Screenings and Antioxidant Activity Test of Kratom Leaf Ethanol Extract (Mitragyna speciosa Korth) Using DPPH Method
Authors: Yuniarti R , Nadia S , Alamanda A , Zubir M , Syahputra R A , Nizam M 
Published: March 2020

Abstract
Antioxidants are compounds that have an important role in health because they can be used as anti-toxic molecules in the body which are the cause of various diseases. One of the plants that have antioxidant content is kratom (MitragynaspeciosaKorth). The purpose of this study was to determine the antioxidant activity of kratom leaf ethanol extract by using the DPPH trapping method. Exploration of kratom leaf samples was carried out by maceration using ethanol 96%, macerate was evaporated with a rotary evaporator, phytochemical screening of kratom leaf ethanol extract and antioxidant testing of DPPH as Free radical. Result of Simplisia Characterization of kratom leaves containing water, air soluble extract contents, ethanol-soluble extract levels, total ash content, and acid insoluble ash content sequentially as follows: 6.65; 18.01; 9.45; 7.14; and 1.06%. Phytochemical Screening results containing kratom leaf ethanol extract containing chemical composition: alkaloids, flavonoids, triterpenoids/steroids, saponins, and tannins. The results of antioxidant activity testing showed that ethanol extract had an IC50 value of 38.56 μg / ml. The results showed that the ethanol extract of kratom leaves had antioxidant activity in a very strong category.
A Comparison of The Fuzzy Time Series Methods of Chen, Cheng and Markov Chain in Predicting Rainfall in Medan
Authors: Arnita  , Afnisah N , Marpaung F 
Published: March 2020

Abstract
Medan has a high rainfall variability. The amount of rainfall affects the welfare of life such as in the fields of health, economy, agriculture, industry, transportation, tourism and so on. To find out changes in rainfall patterns, a prediction of rainfall levels is designed to see and analyze the rainfall patterns that will form in the future. Forecasting is the art and science of predicting future events by taking historical data and projecting it into the future by using some form of mathematical model. One of the methods used to predict an event is the fuzzy time series method. Fuzzy time series is a concept that can be used to predict problems where historical data is formed in linguistic values. While the latest data as a result are in the form of real numbers. The purpose of this research is to implement the fuzzy time series method to predict rainfall in Medan by comparing several developments of the fuzzy time series method, namely Fuzzy Time Series Chen, Markov Chain and Cheng. In determining the interval in the Fuzzy time series Avergae Based rules are used to get the best results. In this study the result is MAPE value of each method. Chen’s method give MAPE=8.002%, Markov chain’s method give MAPE=30.12% and cheng’s method give MAPE=34.5 %. So the best method for forecasting rainfall is Chen Method.
Study on Daily Activity Pattern of Captive Lion (Panthera leo) in Siantar Zoo, North Sumatra, Indonesia
Authors: Siahaan D A S , Berliani K , Hartanto A , Tanjung H M M , Nurbayti  
Published: March 2020

AbstractThe present study investigated diurnal or daily activity patterns of an individual captive lion(Panthera leo)in Siantar Zoo, North Sumatra, Indonesia. Behavioral observations of 70 hours in 10-days observation were analyzed descriptively for common Felidae behaviors identified using a standardized Felidae ethogram. The methodology used was focal animal sampling with continuous sampling of data record or 5-minute sampling periods. We reported that the captive lion allocated the most time budgets in inactive behavior or sleeping with the percentage of 62.88% or 2,604 minutes. Incidence of pacing as stereotypic behavior was documented in low percentage or 4.46% within the duration of or 189 minutes in our study. The dominant sleeping behavior may be considered as normal to captive Felidae in many zoos while some consideration upon their effect to visitor may be evaluated in the future study. Dynamic condition of display cage may be enriched to trigger better behavior related to welfare implications on the captive lion.
The Development of Teaching Material Based on Science Literacy In Thermochemical Topic
Authors: Sutiani A , Zainuddin  , Darmana A , Panggabean F T M 
Published: March 2020

Abstract
Teaching materials are one of the components for improving students’ scientific literacy skills, but teaching materials that exist today, especially about thermochemical materials do not yet have the maximum content of scientific literacy. Through the research design of research and development, scientific literacy-based teaching materials have been developed in thermochemical material. The stages of research include needs-analysis, product design development, validation and analysis. Therefore, the product result and testing phase are limited to effectiveness testing. From the results of the study, it was found that science-based thermochemical teaching materials for general chemistry courses had been successfully developed with the existence of scientific literacy aspects. Moreover, the aspect are the knowledge of thermochemical material which is the aspect of science as a torso, thermochemistry in context which is an aspect of science as a process of inquiry, the high level of thinking skills which is science as a way of thinking, and attitude which is an aspect of interaction between science, technology and society. The overall feasibility validation result is 86.42%, which means the teaching material is in the valid category without revision. Moreover, the readability of teaching material products has an average readability percentage of about 83.79%, which means that teaching materials are included in the criteria to be easily understood.
Occurrence of Nematophagous Fungi in Freshwater Samples of Toba Lake, North Sumatra, Indonesia
Authors: Tarigan W E , Munir E , Hastuti L D S , Hartanto A 
Published: March 2020

Abstract
Root-knot nematodes are important agricultural pests causing serious economical loss to harvestable crops. Biological control using nematophagous fungi is one option to mitigate these infection through mechanism of physical or chemical killing methods. The present study tried to explore a possibility of finding native nematophagous fungal strains in the hope on discovery of novel and potential isolates originating from freshwater region of Toba Lake, North Sumatra, Indonesia. Isolation of nematophagous fungi was based on sprinkle and pour combination method on Chloramphenicol-Water Agar (CWA) incubated for 30 days. Freshwater samples of soil and sediments were collected from 28 sampling sites characterized by different anthropogenic activities as natural, fishery, residential, plantation and tourism area. Daily examination is conducted to obtain a single culture of nematophagous fungi sub-cultured on Potato Dextrose Agar (PDA) medium. Eleven isolates were observed to initiate predatory activities against tested Caenorhabditis elegans based on qualitative screening. The isolates showed either mechanical killing or chemical killing of nematodes during co-inoculation with nematodes. Micromorphological and molecular analysis are currently being conducted to obtain species identity from each isolate.
PM3 Semi-Empirical Method on the Ring Opening Polymerization of ε-Caprolactone Using Bis (Benzoyltrifluoroacetone)Zirconium(IV) Chloride as catalyst
Authors: Yusuf M , Dari N , Utama E 
Published: March 2020

AbstractPolycaprolactone (PCL) is an interesting polymer because of its biodegradability, good mechanical properties, and the excellent miscibility with a large range of other polymers. PCL can be obtained via ring opening polymerization (ROP) ofε-caprolactone (ε-CL) by using Lewis acid as catalyst. The purpose of this study was to focus on the study of the plausible mechanism of the ROP ofε-CL using bis-(benzoyltrifluoroacetone)zirconium(IV) chloride as a catalyst. In this research, PM3 semi-empirical method was conducted to optimize the polymer and complex structure. After that, HyperChem 8.0 program package was used to calculate and to visualize the geometry structure. This program run on a personal computer with Windows 07 operating system. The results of the computational calculation indicate that, to obtain PCL using bis(benzoyltrifluoroacetone)zirconium (IV) chloride catalyst needed several reaction steps, that is coordinationε-CL on the zirconium complex, deprotonation ofε-CL, theε-CL insertion, and the chain propagation.
Developing Analytic Geometry Module and Cooperative Learning Models to Improve Critical Thinking Ability
Authors: Syafari  
Published: March 2020

Abstract
The third phase of the planned three-year research objected to test and to justify the results of the development of the Analytic Geometry module and cooperative learning models assisted with Macromedia flash animation to improve students’ critical thinking skills. Research subjects were students of the Study Program: Mathematics and Mathematics Education, University of State Medan, and Mathematics Education at Muslim Nusantara University, Alwashliyah Medan. This study used developmental research oriented to product development that refers to the 4-D model, which was defining, designing, developing, and disseminating. This third stage produced analytic geometry modules and cooperative learning models supported by Macromedia flash animation as well as instruments of critical thinking skills and positive attitudes toward the justified learning modules and models. These learning modules and models were arranged in the form of lecturer manuals and student books (modules).
Mathematical Model Susceptible, Infected and Recovered with Therapy of Tuberculosis Transmission
Authors: Nasution H , Marlina S 
Published: March 2020

Abstract
Tuberculosis (TB) is one of infectious disease caused by bacteria Mycobacterium Tuberculosis which most often attacks the bronchi. Tuberculosis spreads from person to person by direct contact or also through the air. TB is very dangerous and can attack anyone and if it is not seriously treated will cause death. But if TB given treatment seriously this TB will recover. One treatment of TB is with long-term therapy. This therapy is very influential for recovery of infected people of TB. This article discusses the dynamics of the spread of tuberculosis with therapy through mathematical modeling, the model of disease spread adopted is the SIR Model. From the results of the research showed that by giving therapy to TB patients had a positive and significant effect, especially on recovering, the greater the value of the therapy parameters, the higher the patient’s recovery rate
Modified Monte Carlo method for integral
Authors: Iskandar S 
Published: March 2020

Abstract
The integral value of a function will be determined by the result of the function of the integral function. In fact many integral functions that are difficult to solve sometimes cannot be solved by exact sciences. There are several ways such as by changing its function toThe approach to the Monte Carlo method uses the principle of generating random numbers to test a function. The use of randoms is very closely related to the value of the error obtained. This study aims to minimize the error value of integration by using the Monte Carlo method. The initial integration of the Monte Carlo method with 10000 random points has a fairly large average error value of 0.078, so that the follow-up is done using pias in the Monte Carlo integration.
Analysis of the Quality of Local Potential-Based Invertebrate Preservation Media for Invertebrate Taxonomy Course
Authors: Sitompul A F , Siregar E H 
Published: March 2020

Abstract
Instructional media play a vital role in improving the quality of a learning process, especially in helping the students to learn. Local-potential instructional media are expected to be able to motivate university students to learn preservation methods of invertebrates. However, the quality of the media should be number one priority. This study aimed to examine the quality of instructional media developed in the form of fluid-preserved or wet specimens which were stored in alcohol and formalin. This study used a descriptive approach to data analysis. A comparative analysis of experimental results was performed in this study. The media were evaluated based on the following aspects: compliance with the curriculum standard, quality of the materials, language use, presentation, intelligibility, and benefits of the media. The data were collected using a documentation method and analyzed using a qualitative data analysis technique. The result of the analysis showed that the media complied with the Indonesian National Qualification Framework (KKNI) curriculum standard competencies. In addition, the media also obtained high scores in the quality of the materials, language use, presentation, intelligibility, and benefits (95.78%, 98%, 96.20%, 95.40%, and 97.60%, respectively). Overall, the invertebrate preservation media analyzed in this study have been qualified as proper media to support learning in the classroom.
Setiment Analysis of Public Opinion on The Go-Jek Indonesia Through Twitter Using Algorithm Support Vector Machine
Authors: Syahputra H , Basyar L K , Tamba A A S 
Published: March 2020

Abstract
The development of technology and information, especially in Indonesia is very rapid so that social media is the most popular communication tool by the people of Indonesia today. One of these social media is Twitter. This also causes the public to tend to give opinions and assessments in the form of tweets to service companies, one of which is Go-Jek Indonesia. Public opinion and judgment on Twitter can be classified into 3 classes: negative, neutral, and positive. The purpose of this study is to analyze the sentiment of public opinion on Go-jek Indonesia on twitter using the Support Vector Machine (SVM) algorithm. The approach used were Multiclass One Vs Rest SVM with Univariate Chi Square feature selection to classify community tweets on Go-Jek Indonesia’s services. Using testing data of 170 tweets, 31.2% of people with negative opinions were obtained, 24.1% were neutral and 36.5% were positive opinions and 5.9% failed to be classified. The results of sentiment analysis testing conducted provide a classification accuracy of 91.8%.
Ethnomathematical Study: Creating Math to Students with Gayo Culture
Authors: Hakim H , Rahmadhani E , Wahyuni S 
Published: March 2020

Abstract
This article is one of the writer’s efforts to help answer the question from the teacher namely what should we do to make students enjoy learning mathematics in class? This study aims to describe the local cultural wisdom of the Gayo tribe which is related to ethnomathematics. Cultural elements that can be developed and used in mathematics learning one of which is "Kerawang Gayo". This type of research is descriptive research with qualitative methods. Research subjects are communities leaders, cultural and Gayo tribal community. The instruments in this research were 1) literature study, 2) observation, 3) Interview, and 4) documentation. The data obtained were analyzed qualitatively, followed by concepts provided by Miles and Huberman. Based on the results of the analysis of the research data it was found that the motives contained in the Kerawang Gayo are emun beriring, puter tali, pucuk rebung, sarak opat and tekukur. Mathematical concepts contained in the "Kerawang Gayo" motif can be used to understand mathematics through local culture. Mathematical concepts contained in the "Kerawang Gayo" motif are curved lines, circles, concordance, triangles, angles, congruence, straight lines, parallel lines, reflection, and rotation. Besides recognizing the mathematical concepts of Kerawang Gayo, students also get knowledge about the meaning contained in each of the Kerawang Gayo motifs.
Prospective Science Teachers’ Learning Independency Level on Blended Learning
Authors: Brata WWW , Suriani C , Simatupang H , Siswanto S , Panggabean FTM 
Published: March 2020

Abstract
This study aims to measure the level of self-directed learning readiness of prospective science teacher students studying with blended learning. This study also investigates the relationship of self-directed learning readiness with students’ perceptions of blended learning. This research uses a quantitative method involving 28 students of prospective science teachers in the mathematics faculty and natural sciences at Medan State University. Data were collected using a learning independence questionnaire, which was first validated by two learning experts. Measurement of learning independence is done after students undergo one semester of blended learning. In general, student learning independence is at a moderate level. Analysis based on gender shows that there are no statistically significant differences between men and women in learning independence. This study also revealed that differences in learning outcomes are influenced by the level of learning independence, especially in the "selfcontrol" aspect.
Effectiveness of The Antibacterial Activity of n-Hexane Andaliman (Zanthoxylum Acanthopodium DC) Extract Against Bacillus subtilis, Salmonella typhi, and Staphylococcus aureus
Authors: Susanti N , Situmorang E , Fitri W 
Published: March 2020

Abstract
Infection caused by bacteria is a problem found in various countries, including Indonesia. Different pathogenic bacteria become resistant to some antibiotics. One way to inhibit the activity of these bacteria is to study natural materials that have antibacterial activity. One of the natural ingredients that have these activities is andaliman. It evidenced by the results of the analysis that the diffusion test of Andaliman extract discs uses two types of solvents: n-hexane and ethyl acetate. In the inhibition zone diameter of three types of bacteria, namely: Salmonella typhi, Bacillus subtilis and Staphylococcus aureus and for the antibacterial test several variations of concentration of andaliman extract were used, namely: 12.5 25, 50, and 75%, the best results for n extract -hexane at a level of 50%, namely: 26.7 mm for the best ethyl acetate extract at a concentration of 75%, 21.5 mm, both of the Staphylococcus aureus bacteria. These results indicate that andaliman extract is useful as an antibacterial.