bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Improving of Mathematical Understanding Ability and Positive Attitudes of Unimed FMIPA Students by Using the Contextual Teaching Learning (CTL)Approach
Authors: Purba G I D , Surya E 
Published: March 2020

Abstract
The active involvement of students in learning must be supported by providing special activities that are student-centered so that they can do "doing math" to find and build mathematics facilitated by lecturers. One aspect of "doing math" is to improve mathematical communication skills. The existence of communication skills will certainly bring students to a deep mathematical understanding of mathematical concepts. In addition to mathematical communication skills, an attitude that must be possessed by students is needed, including appreciating the beauty of mathematics, having high curiosity and learning mathematics. With such an attitude, students are expected to develop mathematical abilities, use mathematics to solve problems faced in their lives, and can develop mathematical dispositions. This research conducted on students of FMIPA with the aim of: (1) knowing students’ mathematical communication skills taught by using the problem based learning model and talking learning model; (2) knowing the differences in students’ mathematical disposition abilities taught using Problem Based Learning model and talking learning model; (3) produce a mathematical learning device in the form of an appropriate LAS used to improve students’ mathematical communication; (4) produce teaching materials in the form of textbooks with appropriate problem-based learning model used to improve students’ mathematical communication.
Learning media Animations for Subjects Evaluation and Chemistry Learning Outcomes
Authors: Sugiharti Gulmah , Dalimunthe Makharany , Syuhada Feri Andi 
Published: March 2020

Abstract
Availability of learning media Subjects Evaluation and Chemistry Learning Outcomes is still very limited. In this research, the development of macromedia flash-based animation media will be carried out, the purpose of this study is to: (1) developing macromedia flash-based animation media in the Course of evaluation. (2) validating and revising animation media based on macromedia flash in the Evaluation course, which in the next research will be tested on the developed media in the field.This research is a research and development (research and development). Where the product developed in this research is animation media based on macromedia flash in the Subject ofEvaluation and Chemistry Learning Outcomes. The population and sample of this study, namely teaching materials for making animation media, lecturers and students as validators. To obtain research data, a validation rubric is used in the form of responses and suggestions for improvement from the validator.The data analysis technique was calculated using percent feasibility and suggestions for improvement from lecturers and validators. The results showed that the developed animation media was feasible with a feasibility value of 80%, and the results of student responses were obtained at 82% with excellent criteria.This research produces macromedia flash-based animation media that can be used in the Chemistry Evaluation and Evaluation learning outcomes which are then expected to improve student learning outcomes
Development of Teaching Materials Integrated Spiritual Value Assisted by Visual Studio Media with Problem Based Learning Model In Terms of Learning Motivation
Authors: Oktavianti D , Darmana A , Sudrajat A 
Published: March 2020

Abstract
This study aims to determine the effect of learning motivation on learning outcomes taught by chemistry teaching materials integrated spiritual value using the problem-based learning model assisted by visual studio media. This research used the method of research and development. Instruments used a questionnaire of learning motivation and multiple choice. Based on the analysis of the learning outcome, it is obtained 0.004<alpha (0.05) a sig.score, while the analysis of learning motivation is obtained 0.003<alpha (0.05) a sig.score. This research can be concluded that there is a positive correlation between learning motivation and learning outcome based on Pearson correlation test minimum category as many as 0.325.
The Effect of Red Dragon Fruit Juice Towards Cholesterol Level and Maximum Aerobic Capacity (VO2max) on Sport Science Students Treated with Heavy Physical Exercise
Authors: Harahap N S , Sunarno A , Simatupang N , Suprayitno  
Published: March 2020

Abstract
Heavy physical exercise causes increased production of free radicals. The accumulation of oxidative stress can reduce cardiorespiratory endurance. VO2max plays a role as an indicator of the circumstances of cardiorespiratory. An increase in cholesterol levels is a risk factor for coronary heart disease. As a result, there is a decrease in fitness marked by a decrease in the value of VO2max. The purpose of this study was to determine whether the antioxidant supplement given during heavy physical exercise had a beneficial effect on decrease cholesterol and the increase of VO2max levels. The subjects were 30 students, male sex, 20-22 years old, divided into 3 groups randomly, each 10 people, group 1: subjects not given heavy physical exercise and only given a placebo (control); group 2: subjects given heavy physical exercise and placebo (HPE-RDF); group 3: subjects given heavy physical exercise and red dragon fruit juice (HPE+RDF). Measurement of cholesterol and VO2max levels in the pre-test and post-test. The results showed that there was an increase in VO2max and a decrease in cholesterol (p<0.05) in the HPE + RDF group compared to the HPE-RDF group. The Heavy exercise group given red dragon fruit juice can increase VO2max and reduce cholesterol levels.
Blog as a Learning Media in Increasing Student Understanding
Authors: Siregar TM , Frisnoiry S , Andreani A 
Published: March 2020

Abstract
This study aims to determine the effect of blogs as a learning medium on increasing student learning outcomes in the Mathematics Learning Evaluation course. This research was conducted in two classes, each as a control class and an experimental class. The method used is a quasi-experimental design with the Experimental Randomized Control Group. The instruments used to collect data in this research were objective tests and questionnaires. This study concluded that there were differences in learning outcomes between students who were taught using blog media and students who were taught without using blog media. And the response of students to the media blog is good.
Analisys of the impact of mathematical learning with geogebra asistance on critical thinking ability
Authors: Munandar  , Usman  , Saminan  
Published: March 2020

Abstract
This study aimed to analyze the impact of mathematics learning assisted by geogebra software on students’ critical thinking skills. This research was an experimental research with a quantitative approach. There were two groups of samples used, namely the experimental group with learning assisted by geogebra software, and the control group with learning without using geogebra software. The population in this study were students of class VIII Junior High School 2 Banda Aceh with students of class VIII-2 as an experimental class and VIII-8 as a control class. The instruments used were pre-test and post-test critical thinking skills. Data analysis techniques using non-parametric statistics with Mann-Witney test and analyzed with SPSS statistics 22 software. The results showed that mathematics learning assisted by geogebra software has an impact on increasing students’ critical thinking skills.
Estimates Long-term Data of Multi-State Model
Authors: Manullang S , Hutabarat H D M , Panjaitan M 
Published: March 2020

Abstract
This study aims to obtain an estimate of transition opportunities from the health status of elderly persons. The phenomenon of changes in health status in the elderly has a chance of transition at each shift in their health status. To obtain an accurate estimate of the transition probability in a multi-status model of health status is indispensable. We estimate the four-state multi-state models from alive/healthy through out-patient sickness, in-patient sickness to death with recovery from either of the two cases of sickness will be used based on medical data elderly. The focus will be on deriving the probabilities of transition from one state to another via the forces of intensities. We then provide a method for estimating unique transition probabilities for both males and females elderly, generally behaved as expected with transition probabilities to sickness states increasing with age. Transition probabilities out of the sick state appear higher for males than females.
Optimization and Assessment Orally Disintegrating Tablet of Using Biopolymer Combination
Authors: Ridwanto  , Lubis M S 
Published: March 2020

Abstract
Orally Disintegrating Tablet (ODT) or a crushed tablet in the mouth is one of the most useful drug preparations for geriatric and pediatric patients who have difficulty swallowing conventional tablets. This research aims to determine the effect of single and combination biopolymers. The optimization of the disintegration time of ODT preparations did by 11 formulas printed with direct press technique. It consisted of single biopolymers and combinations of Chitosan, Xanthan gum, Carboxymethyl cellulose, and Maltodextrin. Evaluation of ODT preparations begins with an evaluation of formulation, which includes the flow rate test, fixed angle, and compressibility index. The evaluation of the formulated ODT measured by size and weight uniformity test, hardness test, rigidity test, and wetting time test. Also, in vitro and vivo disintegration test. All formulas meet the ODT physical quality requirements. ODT 8 is an ODT formula that uses a disintegrant combination of biopolymer Chitosan and Maltodextrin. It shows the fastest disintegration time is 19 seconds. The statistical test showed a significant difference between the ODT formula to the optimization of disintegration time with a value of p < 0,05. ODT with a biopolymer combination has a faster disintegration than ODT with a single biopolymer.
Vegetation Structure and Composition in Taman Wisata Alam (TWA) Sicike-cike as Ritual Site for Local Community
Authors: Huda M K , Pasaribu N , Syamsuardi  , Siregar E S 
Published: March 2020

Abstract

Taman Wisata Alam Sicike-cike is a nature conservation area intended for the benefit of natural tourism and recreation. TWA Sicike-cike besides being used as tourist site, is also known for its ritual or traditional ceremonial site performed by the Pakpak-Dairi tribe. Presence of local wisdom on forest management, such as tapping the sap of incense (Styrax paralleloneuron) and floral organ are commonly utilized as a worship material during traditional rituals. The importance of this forest region for local communities is crucial for the sustainability of the local wisdom of the Pakpak-Dairi tribe. This study aims to determine the vegetation structure and composition in ceremonial sites located within TWA Sicike-cike. The study used vegetational analysis to obtain Importance Value Index (IVI) from each structures (seedling, sappling, pole and tree. The results showed that the largest INP at seedling to tree structure was dominated by Rhododendron malayanum with 46.29, 26.41, 55.53, and 28.99 for seedling, sapling, pole and tree, respectively. Shannon’s diversity index (H’) in this region falls between medium to high diversity categories. Hence, Rhododendron malayanum is considered as primary indicator of typical vegetation in ceremonial site of TWA Sicike-cike which dominate all types of vegetational structure with complete growth rate.
Implementation of Dubido Based on Contextual in Improving Students Achievement on Rate Reaction
Authors: Muchtar Z , Rosalia A V A , Silaban S 
Published: March 2020

Abstract
In recent year, efforts to develop learning media for various learning models continue to be the center of attention of education stakeholders. This is caused not only because it is facilitated by information technology but there is a change in the lifestyle of students due to the presence of information and communication technology. In this research, the development of android-based mobile education (Dubido) is based on contextual learning for reaction rate material. Research which is an R&D research with the aim of improving student learning outcomes and interests. The sample of this research were undergraduates’ students from chemistry education study program. The sample was divided into two classes where the experimental class 1 was taught using dubido based on contextual while the second experimental class was taught by direct instruction. The results showed that the media of dubido that had been developed increased the interest of students studying the material reaction rates. And the implementation of dubido based on contextual was given positive effect to increase student’s achievement.
Development of The Thermochemistry- Hots-Tawheed Multiple Choice Instrument
Authors: Darmana A , Sutiani A , Jasmidi  
Published: March 2020

Abstract
This research is part of the development research in thermochemistry-hots-tawheed teaching materials. the purpose of this research is to develop the thermochemistry tawheed High Order Thinking skills (HOTs) test instrument. the stages of the research began by designing 45 multiple choice items with five options. The instrument assessed by three science education experts, and pilot tested to 56 chemistry students. analysis of the test items was carried out using the rasch measurement model approach, the multiple choice test analyzed with winsteps software, and expert validation analyzed using facets software. Multirater validation test results showed 27 of 45 test items were in good quality (60%) according to the experts. The multiple choice items results : (1) the reliability of the test items was good quality (reliability index 0.89); (2) test of item fit, 34 out of 45 test items are good in fit statistics indices (75.6%); (3) person map item test, showing difficulty level, easy: medium: difficult = 50%: 33%: 17%; (4) the test distractor work well for 23 of the 45 test items (51%); (5) there are 19 of 45 valid test items based on pilot tested results that are in accordance with expert judgment.
Biology Students Perception of Learning Ethnobotany based on Electronic Learning (E-Learning)
Authors: Nasution Aswarina , Hasairin Ashar , Arwita Widya 
Published: March 2020

Abstract
Internet connection has become useful part of education. Many teachers and lecturers create electronic learning to support their learning-teaching process. The aim of this research is to know the student’s perception of e-learning in ethnobotany. Descriptive research was used to get the data by giving 28 students questioners. Based on the questioners that have been analyzed, researcher found that 100% of students know about e-learning and have access to e-learning 96.43% of students state that e-learning can helps the learning process and 100% of students agree that e-learning help them to access the subject matter. There are 5 obstacles identified from the survey including connection problem (96.42%), the lack of information about how to use e-learning (50%), interaction problem with lecturers through e-learning (21.43%), lack of discipline to use e-learning to study (14.29%), and don’t know how to use e-learning (7.14%). Further research is needed to overcome this problems.
Levels Pb (Lead) Content in The Thallus Lichens at Three Shade Tress in The Terminal Pinang Baris Medan, North Sumatera
Authors: Hasairin A , Harsono T , Nasution A , Siregar R 
Published: March 2020

Abstract
This research aims to know the levels of Pb (Lead) on thalus lichens found on the three forest shade trees road in the area of Terminal Pinang Medan, North Sumatera. Type of this research is a descriptive exploratory survey method. Measurement of the levels of lead (Pb) using Furnace (destruction of dried) and Atomic Absorbance Spectrophotometer (AAS) in Medical Field Laboratory Hall. From the results of research conducted in the Terminal Area of Pinang Baris Medan, it is known that there are 12 different types of lichens. Results of the study known types of lichens that have levels of lead (Pb) is a type of most lichens Parmelia grabratula 49,01 mg/kg from Acacia trees (Acacia auriculiformis) I, and the lowest levels of lead (Pb) is a Palm tree from Buellia canescens 10,19 mg/kg III (Hyophorbe sp.).
MEMS and IoT Applications in ISLE-based STEM Physics Learning Media for Mechanics Topic with LabVIEW Integration
Authors: Irwandi I , Sari I M , Oktavia R , Syukri M 
Published: March 2020

Abstract
The development of technology in the 21st century is so rapid both in the field of sensor and data communication. In fact, almost all smartphones have used the technology. In addition to using cutting edge sensor technology, smartphones are also equipped with internet communication features so they can be categorized as IoT (Internet of Things) devices. However, both of these technologies have not been optimally used as a media for learning physics. This paper discusses the use of MEMs (Micro-electromechanical system) sensor (ADXL-345) to detect the oscillation of the spring-mass system. Data obtained by MEMs is read by IoT based Microcontrollers (NodeMCU EPS8266) and directly transferred to the intranet WIFI network via the UDP (User Datagram Protocol). The data transmitted in the UDP packet is received by a computer that is integrated with LabVIEW, a user-friendly software that is based on a Graphical Programming. Students were encouraged to conduct several experiments to investigate the dependence of the period of the spring-mass system on the mass, the spring constant, and the amplitude. The oscillation of the spring-mass system received by the computer recorded the amplitude and the period of oscillation. Then students will compare the data from various observational experiments to predict the relation among the variables. Finally, they tested their prediction by conducting a testing experiment. This learning model is using ISLE (Investigation Sciences Learning Environment) syntax where students constructed their knowledge about mechanics, especially about spring-mass system, and enjoyed their discoveries as scientists did. Since the learning media has used technology and also carried out engineering process stages and involved the calculation of mathematics to understand the measurement results, it can be said to have used the STEM (Sciences, Technology, Engineering, and Mathematics) approach. We observed that an atmosphere of “learning is fun” existed during the lesson.
The Final Thesis Project is the Main Determinant of the Length of Study Period for Undergraduate Students of the Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan
Authors: Sipahutar H , Mukhtar  , Nasution M Y , Gaol A Y D L 
Published: March 2020

Abstract
The purpose of this study was to find out the factors affecting the students’ length of study period especially those related to the academic governance, thesis guidance, and supporting facilities at the Faculty of Mathematics and Natural Sciences (FMNS) of the State University of Medan (Unimed) in the academic year of 2017/2018. Questionnaires were distributed to 469 final year students and 170 thesis supervisors (TS), which represented eight study programs and one Bilingual Program, as well as to 32 administration staff (AS) in FMNS of Unimed. Questionnaires consist of 44 (students) or 40 (TS) or 15 (AS) closed and open questions related to administrative and TS services, supporting facilities, and subjects. Data were analyzed descriptively. The results show that the average length of the study period is 8.9 semesters, far longer than the ideal one (8 semesters). The most important factor contributing to the prolongation of the study period is the length of time needed by the students to complete the thesis final project (TFP), which is an average of 1.6 semesters. Factors causing the prolongation of the TFP completion period include: (a) the administrative staff service function is less supportive, (b) supporting facilities (such as SOPs, Thesis Guidebooks, internet, references in libraries, and laboratory facilities) cannot be utilized properly by students, (c) supporting subjects, especially English and Statistics, have not contributed well to the completion of TFP, and (d) the commencement of TFP work, namely in semester VIII, is too late. To overcome the problems, the following actions need to be taken: (a) improving the quality of administrative services and simplifying TFP governance, (b) updating SOPs and thesis guidebooks, library references, internet, and laboratory, (c) increasing the relevance of the contents of supporting thesis courses, and (d) repositioning of TFP courses one semester earlier. Train students early to find and use references to conduct mini-research and student creativity programs, and their involvement in the lecturer’s research will also be very helpful.
Incorporating canopy structure from simulated GEDI lidar into bird species distribution models
Authors: Burns Patrick , Clark Matthew , Salas Leonardo , Hancock Steven , Leland David , Jantz Patrick , Dubayah Ralph , Goetz Scott J 
Published: March 2020

Abstract
The Global Ecosystem Dynamics Investigation (GEDI) lidar began data acquisition from the International Space Station in March 2019 and is expected to make over 10 billion measurements of canopy structure and topography over two years. Previously, airborne lidar data with limited spatial coverage have been used to examine relationships between forest canopy structure and faunal diversity, most commonly bird species. GEDI’s latitudinal coverage will permit these types of analyses at larger spatial extents, over the majority of the Earth’s forests, and most importantly in areas where canopy structure is complex and/or poorly understood. In this regional study, we examined the impact that GEDI-derived Canopy Structure variables have on the performance of bird species distribution models (SDMs) in Sonoma County, California. We simulated GEDI waveforms for a two-year period and then interpolated derived Canopy Structure variables to three grid sizes of analysis. In addition to these variables, we also included Phenology, Climate, and other Auxiliary variables to predict the probability of occurrence of 25 common bird species. We used a weighted average ensemble of seven individual machine learning models to make predictions for each species and calculated variable importance. We found that Canopy Structure variables were, on average at our finest resolution of 250 m, the second most important group (32.5%) of predictor variables after Climate variables (35.3%). Canopy Structure variables were most important for predicting probability of occurrence of birds associated with Conifer forest habitat. Regarding spatial analysis scale, we found that finer-scale models more frequently performed better than coarser-scale models, and the importance of Canopy Structure variables was greater at finer spatial resolutions. Overall, GEDI Canopy Structure variables improved SDM performance for at least one spatial resolution for 19 of 25 species and thus show promise for improving models of bird species occurrence and mapping potential habitat.