<p>Teachers and students have very important roles in the learning process. The teacher's role is planning and conducting the learning process. Students are required to be actively involved in learning. The success of a teacher in teaching will be determined by how active students are in participating in learning. Students' active learning will show that they really follow the learning process. The results of field observations indicate that student activity is still very low. Students very rarely ask questions, are less enthusiastic, unfocused, and sleepy when the teacher teaches. The purpose of this study is to discuss the role of Christian teachers in increasing student activity in the learning process. The results showed that Christian teachers play a role in increasing student activity in the learning process. Teachers are advised to create learning that is fun and not boring by creating varied learning methods, making teaching aids, and using ice breakers or games.</p><p><strong>BAHASA INDONESIA ABSTRACT: </strong>Guru dan siswa memiliki peran yang sangat penting dalam proses pembelajaran. Guru berperan dalam merencanakan dan melakukan proses pembelajaran. Siswa dituntut untuk dapat terlibat aktif dalam belajar. Keberhasilan seorang guru dalam mengajar ditentukan seberapa aktif siswa dalam mengikuti pembelajaran. Siswa belajar aktif menunjukkan bahwa mereka sungguh-sungguh mengikuti proses pembelajaran. Hasil observasi di lapangan menunjukkan bahwa keaktifan siswa masih sangat rendah. Siswa sangat jarang mengajukan pertanyaan, kurang bersemangat, kurang antusias, tidak fokus, dan mengantuk ketika guru mengajar. Tujuan penulisan ini adalah membahas mengenai peran guru Kristen dalam meningkatkan keaktifan siswa dalam proses pembelajaran. Hasil penelitian menunjukkan bahwa guru Kristen berperan dalam meningkatkan keaktifan siswa pada proses pembelajaran. Peran guru Kristen dalam proses pembelajaran adalah menggunakan metode pembelajaran yang bervariasi, membimbing siswa ketika mengalami kesulitan dalam memahami materi, dan membuat <em>ice breaking</em>. Guru-guru disarankan untuk menciptakan pembelajaran yang menyenangkan dan tidak membosankan dengan membuat metode pembelajaran yang bervariasi, membuat alat peraga, dan membuat <em>ice breaking</em> ataupun <em>games</em>. </p>
The synthesis and characterization of Ba0.6Sr0.4Fe12O19/LaMnO3 composite material has been successfully carried out by mechanical alloying method using high energy milling. Crystal structure and surface morphology were characterized using x-ray diffraction and scanning electron microscopy. While the value of magnetization and the ability to absorb microwaves, vibrating sample magnetization and vector network analyzing were used, respectively. With variations in weight, does not change the crystal structure. The Ba0.6Sr0.4Fe12O19 phase has a hexagonal structure and the LaMnO3 phase has an orthorhombic structure. Surface morphology has a heterogeneous size in the range of 200-450 nm with the form of platelets. The best composite material Ba0.6Sr0.4Fe12O19/LaMnO3 (75/25 wt%) is with composition of 75/25 wt%, and has magnetic properties with a magnetic saturation of Ms ~ 46.83 emu/g, Mr ~ 28.8 emu/g, and a coercive field of Hc ~ 3.88 kOe. The minimum reflection loss value is -13.0 dB at 11.2 GHz frequency and broadband absorber with RL of -8dB at 8-12 GHz.
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