Judul: Effectiveness of Instructional Video in the Dissemination of Agricultural Information (Field Experimental: Control of PBK Pest in Cacao Farming in Kecamatan Amahai, Kabupaten Maluku Tengah)
Abstrak: Factor of geography and limited agricultural communication channels made the dissemination of agricultural information limited and unequally distributed. The question is whether the brief and practical form of instructional video and its capability in exposing message could be used as an effective information channel. This research had the objective to clarify the performance effects of message of instructional video in increasing farmers’ knowledge and its correlation to perception indicator, personal characteristics, and communication behavior. The research was conducted on three experimental groups taken randomly from 60 cacao farmers. Two groups were treated with instructional video and demonstrative method, while the third group was treated as control. Separate pre-test and pos-test conducted on the samples was used as the design. ANCOVA and Spearman correlation method were used in analyzing the data. The results indicated that the message performance of the instructional video and demonstration method had the same effectiveness in influencing the increase in knowledge. The effect had the correlation to the perception about the instructional video, but had no correlation to the personal characteristics and communication behavior. Therefore, the effectiveness of the instructio n video in the dissemination of agricultural information was determined by the perception of the farmers, and it was effective for use by farmers with different personal characteristics and communication behavior.
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Judul: Efektivitas Desain Pesan Video IPB “Karya untuk Negeri” dan Perubahan Persepsi Siswa SMA Negeri 2 Bogor tentang Pertanian
Abstrak: The purpose of this research is to identify the level effectiveness of message design on video and analyze changes in the perception of SMA Negeri 2 Bogor’s students about agriculture. The research uses experimental methods by pre-test and post-test. The result shows that the message design on video has a moderate level of the effectiveness which elements soundbite (audio) and pictures (visual) are the most interesting. IPB’s video “Karya untuk Negeri” is able to change the perception of students about agriculture for being better.
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Judul: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik.
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik