Abstrak: Penelitian ini bertujuan untuk menganalisis sektor unggulan per kecamatan di Kawasan MEBIDANGRO dan menganalisis hierarki dan interaksi antarwilayah kecamatan di Kawasan MEBIDANGRO. Penelitian ini menggunakan metode deskriptif kuantitatif dengan basis data sekunder. Analisis data untuk menentukan sektor unggulan menggunakan metode analisis Location Quotient (LQ), Shift-Share (S-S), dan Tipologi Klassen. Untuk menganalisis hierarki dalam penelitian ini digunakan analisis skalogram dan indeks sentralitas Marshall. Interaksi wilayah ditentukan dengan analisis gravitasi dan analisis titik henti. Hasil penelitian menunjukkan bahwa wilayah-wilayah dalam Kawasan MEBIDANGRO memiliki dua karakter sektor unggulan yaitu spesialisasi pada sektor primer dan diversifikasi dari berbagai sektor. Penelitian ini juga menemukan bahwa hierarki tertinggi terdapat di Kecamatan Percut Sei Tuan yang sekaligus memiliki pengaruh yang paling kuat dari segi interaksi dengan wilayah lain.Kata kunci: hierarki wilayah, interaksi wilayah, Kawasan MEBIDANGRO, sektor unggulan Abstract: This research aims to analyze the priority sectors in MEBIDANGRO districts and their regional hierarchy and interactions. It used a quantitative descriptive method based on secondary data. The priority sectors were analyzed using Location Quotient (LQ), Shift-Share (S-S), and Klassen Typology. For analyzing the regional hierarchy, the research employed scalogram analysis and Marshall centrality index. The regional interactions were determined by gravitation and breaking point analysis methods. The results show that the regions in MEBIDANGRO have two distinctive priority sectors, namely primary sector specialization and sector diversification. The research also found that Percut Sei Tuan District performs at the highest hierarchy with the strongest influence on regional interactions.

Fe3O4/SiO2/TiO2dopped Cu with magnetic properties had been succesfully syntesized and characterized. The research was began with the synthesis of magnetite and magnetite covered by silica by co-precipitation and sonication method, and the preparation of Cu-doped TiO2using sol-gel method followed by calcination. The concentrations of Cu were 0%, 1%, 3%, 5%, and 7% (FST0, FST1, FST3, FST5, and FST7). The Fourier Transform Infra Red spectrophotometer (FTIR), X-Ray Diffractometer (XRD), Scanning Electron Microscope-Energy Dispersive X-ray spectrophotometer (SEM-EDX), UV-Specular Reflectance Spectrophotometer (SR-UV), and Transmission Electron Microscope (TEM) were used to characterize the nanocomposite and external magnetic bar was used to separate the nanocomposite in an aqueous media. The Cu concentration affected the band gap energy (Eg) and the optimum result was 2.832 eV in FST7. The best magnetic propertieswas material FST0. The time needed for separate this material with aqueous medium was 372 second.

This study aims to develop the design of geography learning materials containing Indonesian geopolitics as a systemic program to strengthen national character in the Department of Geography Education, Faculty of Social Sciences, State University of Medan. The specific target to be achieved is the production of textbooks on geography learning materials containing Indonesian geopolitics. The research method used is the R&D method by following the Borg & Gall procedure. The research subjects involved: lecturers in Political Geography courses; students as subjects for a limited group trial; and five experts for the validation of teaching materials. The instruments used were expert validation questionnaires, learning outcomes tests and observation sheets, which were analyzed using: qualitative descriptive analysis to analyze information about various field conditions; quantitative descriptive analysis used to analyze the scores given by the expert; and statistical analysis assisted by STATCAL software. The results showed that the textbooks developed were valid and suitable for learning Political Geography, as well as contributing to the systemic program of strengthening national character in campus life by placing six pillars of character, namely: citizenship, justice, honor, responsibility, caring, and being able to trust.