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Muhammad Al Fauzan, NPM 180015 (2022). Communication Patterns of Da'wah in Islamic Broadcasting Based on Local Wisdom (Da'wah Study on Buya Hamka) This study aims to determine the communication patterns of da'wah carried out by Buya Hamka and to find out the implementation of the elements of da'wah by Buya Hamka. Data collection was carried out by using literature study references. In reviewing the data using descriptive exploratory method. The results showed that the da'wah principle uses the principle of rationality, has firmness in holding Islamic principles and has exemplary, and Hamka's da'wah has a great effect on the community, one of which is increasing religious knowledge, increasing belief and faith, providing enlightenment to the people and changing behavior into even better.Keywords: Buya Hamka, Principles of Da'wah, Elements of Da'wah

The purpose of this research is to determine the publication trend of open access journals in Indonesia. A systematic review was used as the research method in this study. The focus of this study is to identify the themes that are most frequently discussed and discovered in studies on open access journals in Indonesia. According to the findings of this study, the most frequently discussed research themes were those concerning journal governance, marketing strategies, user perspectives, and matrices. Although several themes were discovered, the most frequently discussed theme was journal governance, specifically the challenges and problems faced by journal managers. Financing issues, journal quality, and piracy are among the challenges and issues discussed. This is due to the state of open access journals, which are still evolving in response to technological advancements.

Telah dilakukan penelitian terkait dengan ketebalan lapisan mikrostruktur dengan menggunakan SEM (Scanning Electron Microscope) dan Image-J. Sampel diuji dengan menggunakan SEM untuk mendapatkan mikrostruktur dari sampel. Setelah mikrostruktur didapatkan maka dilakukan analisa ketebalan lapisan mikrostruktur dengan menggunakan teknik pengukuran secara langsung menggunakan SEM dan teknik pengukuran tidak langsung menggunakan aplikasi Image-J. Berdasarkan hasil penelitian yang telah dilakukan, pengukuran ketebalan lapisan dengan menggunakan SEM dan Image-J menunjukkan pola kurva yang sama untuk semua ketebalan lapisan. Persentase perbedaan pengukuran ketebalan lapisan dengan menggunakan SEM dan Image J adalah 0.7% untuk lapisan ke-1, 1,6 % untuk lapisan ke-2 dan 0.8 % untuk lapisan ke-3. Persentase perbedaan  tersebut sangat kecil (<2%) sehingga aplikasi Image-J ini dapat digunakan sebagai alternatif di dalam pengukuran ketebalan lapisan mikrostruktur