This study aims to: (1) determine the results of student learning activities before learning by using the Quantum Learning model on the theme of life events in class V SD Negeri 101911 Sidodadi Batu 8 Deli Serdang. (2) knowing the efforts to increase student learning activities using the Quantum Learning model on the theme of events in life in class V SD Negeri 101911 Sidodadi Batu 8 Deli Serdang. Based on the results of observations and tests filled out by students, it can be concluded that teachers have been able to maintain and improve the implementation of teaching and learning activities using the Quantum Learning model and learning video media. This is based on the results of observations which show an increase with the improvement of teaching and learning activities based on observer observations. Student learning activities have also increased, this can be seen from the increase in the average percentage of student learning activities, namely in cycle I 68% to 91% in cycle II. It can be concluded that the percentage of student learning activities using the Quantum Learning model and learning video media in cycle II has increased by 41%. The percentage of implementation of the Quantum Learning model using video reaches 89% in teacher (researcher) activities in carrying out learning in the classroom.

This research aims to determine the learning outcomes on the theme of technological development for class III students who are taught using the Problem Based Learning learning model and to examine the effect of the Problem Based Learning Learning Model on student learning outcomes on the theme of technological development for class III students. The population of this study were all students of class III SD, totaling 58 people consisting of 2 classes III A and III B. This study used experimental research. The test results using the independent sample t-test formula, obtained tcount = 2.43 and ttable = 2.04. Thus tcount ttable = 2.43 2.04, the average value of the experimental class and control class, where the experimental class is 68.33 and the control class is 59.56. It can be concluded that there is an influence of the problem-based learning (PBL) learning model on student learning outcomes in thematic subjects on the theme of technological development for class III students at SD Negeri 101731 Kp. Lalang.

This development research aims to (1) development  videoscribe learning media in learning theme 5 Weather, (2) find out the feasibility of developing videoscribe media in increasing student learning motivation. This research is a type of research and development Research and Development (RD) using the ADDIE development model which consists of 5 stages, namely. Analysis (Analysis). Design (Design). Development (Development), Implementation (Implementation) and Evaluation (Evaluation).The instruments used in this study were educational practitioner questionnaires, media expert questionnaires, material expert questionnaires, student response questionnaires and teacher response questionnaires to determine the feasibility of the developed 5 weather theme videoscribe media.Based on the validation results from educational practitioners, a percentage of 98.8% was obtained with the "Very Eligible" criteria. From the validation results of media experts, it was obtained an average percentage of 96.6% with the criteria of "Very Eligible". From the results of the material expert validation, an average percentage of 94.5% was obtained with the criteria of "Very Eligible". From the validation results of student responses, a percentage of 95.7% was obtained with the criteria "Very Eligible" and from the validation results of the teacher's response, a percentage of 98% was obtained with the criteria "Very Eligible". From the assessment obtained, it can be said that the 5 weather theme videoscribe media developed "Very Eligible" is used in the learning process.

Epidemiological models may provide public health practitioners with some fundamental guidelines, allowing for the examination of issues that may influence disease prevention and treatment techniques. On establish the relative impact of the model parameters to disease transmission, a sensitivity analysis of the epidemiological model is undertaken. A sensitivity analysis of the Susceptible, Exposed, Infectious, and Recovered (SEIR) model of corona virus 2019 (COVID 19) was undertaken to determine the parameters’ influence on the basic reproduction number and endemic equilibrium. The rate of contact between susceptible individual and exposed individuals and rate of exposed to infected individuals are the most impactful parameters on the basic reproduction number and the number of infectious individuals, according to our findings. Furthermore, the number of people who have been exposed is affected by the rate at which they proceed from exposed to infect. The findings show that if infectious people recover faster, the number of contagious people will decrease.

This study aims to: (1) develop media using Macromedia Flash 8 applications in elementary thematic learning, (2) determine the feasibility of developing Canva applications in elementary thematic learning. This research is a type of Research and Development (RD) research with the ADDIE model which includes five steps, including: analysis, Design, Development, Implementation, Evaluation . The subjects in this study were media expert validators, material experts, education practitioners, namely fourth grade teachers and fourth grade elementary school students. The research instruments used in data collection were questionnaires, observations, and documentation. The results of this study indicate that the Macromedia Flash 8 Application learning media in the Thematic Learning of the Always Save Energy Theme for Grade IV Elementary School is "Very Eligible" with details of the percentage of eligibility given by media experts in Sub Theme 1 of 86.6% with the category of "Very Eligible", Sub Theme media 2 of 83.3% in the "Very Eligible" category, Sub Theme media 3 by 86.6% in the "Very Eligible" category. Material experts on media Sub Theme 1 are 94% in the "Very Eligible" category, Sub Theme 2 is 94% in the "Very Eligible" category, Sub Theme 3 is 92% in the "Very Eligible" category. For education practitioners in media Sub Theme 1, 94% in the "Very Eligible" category, 94% in Sub Theme 2 in the "Very Eligible" category, 94% in Sub Theme 3 in the "Very Eligible" category, Individual trials of 95.2% with the "Very Eligible" category and small group trials of 93.7% with the "Very Eligible" category. Therefore, it can be concluded that the Macromedia Flash 8 Application learning media in the thematic learning of the Always Save Energy for grade IV SD Negeri 016555 Asahan is "very feasible" to be used by students during the learning process.