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One of the achievements in the subject of concepts, techniques, and the reconstruction of art tools and equipment in the Dance and Music Drama Education Study Program, Faculty of Teacher Training and Education, Syiah Kuala University, was to reconstruct one of the musical instruments. In this study, one of the musical instruments that will be reconstructed is the traditional musical instrument of the people of Aceh, especially Central Aceh, which is called the Rebeb Gayo musical instrument. One of the reasons for reconstructing the Gayo Rebeb musical instrument is because this musical instrument has long been extinct. So that through the reconstruction of the musical instrument, the Rebeb Gayo musical instrument can be returned which has long been extinct. So this can be an effort to preserve extinct musical instruments. This research method is an experiment, by looking at the results of experiments on making Rebeb Gayo musical instruments starting from the preparation of tools and materials, manufacturing methods, tone systems and techniques for playing Rebeb Gayo musical instruments. The results of the research produced the Rebeb Gayo musical instrument and it can be played well.

The purpose of this research to revisits methods that are more effective in nonlinear Optimization with single variable polynomial functions at high degrees. Models with linear objective functions and constraint functions are Polynomials of third, fourth and fifth degree reconstructed into subproblems that are easier to solve, namely quadratic programs, using bilinear Auxiliary Functions and solved by MATLAB simulations. The method used is the development of Tawarmalani & Sahinidis' research regarding relaxation with Auxiliary Functions. Examples of nonlinear Optimization with polynomial functions are also given to illustrate the implementation of this algorithm. The results of the research show that the application of the development reconstruction method produces a global solution that is no better than the solution to the original problem so that it is not an effective alternative method to use.

The world of education in indonesia is currently experiencing a change in services due to the covid 19 pandemic and is required to make changes to the way of teaching, and other administrative services in the context of the indonesia education world, the massive changes in services resulting from the impact of the covid 19 pandemic have greatly disturbed students, teachers and parents. They are required to make changes to the way of teaching and learning and guide quickly and accurately.The role of the teacher is now very important because the learning prosess cannot be faceto-face anymore. The teacher must really do everything possible so that students can understand the material presented online.This study aims to determine:( 1) the role of teachers in improving PAI learning outcomes during the covid 19 pandemi at SD No. 1 Seminyak for the 2019/2020 school year, (2) learning outcomes during the covid 19 pandemi at SD No. 1 Seminyak 2019/2020 academic year, (3) inhibiting and supporting factors in the implementation of online learning in Islamic education subjects during the covid 19 pandemic at SD No. 1 Seminyak in the school year 2019/2020.This type of research is descriptive kwalitatif, the informan is determined by purposive method, while the key informants are the principel, religion teacher, home room teacher, students, student guardians and the data committee is analyzed by data reconstruction stages, data presentation, and verification conclusion.The results showed; (1) teachers are require to play a deeper role in online learning during the covid 19 pandemi, the online learning process delivered material through learning videos in the whatsap grop, make google absences from monitoring students to memorize short surahs via whatsapp or video calls to provide motivation and encouragement to students. (2) Pai's study results during the covid-19 pandemic are less than maximal because teachers cannot monitor students directly and many obstacles in online learning. (3) supporting factors in the implementation of online learning, namely, the availability of mobile quota and internet networks. While the inhibiting factor in online learning, namely, aconomi limitations, internet network is sometimes not as stable.