Judul: Karakterisasi Morfologi dan Agronomi Jarak Pagar (Jatropha curcas L.) Beberapa Aksesi Indonesia Bagian Barat
Abstrak: Morfological and agronomical characterization are important in developing superior varieties of jatropha. In this study, characterization was aimed for analyzing qualitative and quantitative character of 15 accessions from 5 regions in western Indonesia, i.e. Medan, Bengkulu, Banten, Bogor, and Sukabumi. Based on 5 variables, i.e. number of branches, number of productive branches, number of fruits per plant,uniformity of fruits ripening, and time of flowering, there were 3 accessions that have best character. They were Banten I, Bengkulu I, and Sukabumi II. The qualitative characteristic identification showed that qualitative characterization was not influenced by accessions. Based on cluster analysis showed that at 80 % similarity level the 15 accessions could be classified into three main groups. Group I consist of Medan I, Bengkulu I, Bengkulu III, Bengkulu IV, Bogor I, Bogor II, Bogor III, Sukabumi I, Sukabumi II, Sukabumi III, and Sukabumi IV. Group II contain Banten I whereas Medan II, Bengkulu II, and Banten II could be grouped into Group III.
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Judul: Pertumbuhan Beberapa Genotipe Jarak Pagar (Jatropha curcas L.) di Tanah Masam
Abstrak: Indonesia have many acid lands, but their usefullness were still a bit because the nutrient content in acid land is low. Meanwhile, Jatropha is a plant which can grow on various types of lands (includes on marginal land) and has used as raw material for biodiesel. Therefore, the growth of Jatropha need to be study on acid land as an effort for developing Jatropha and usefullness of acid land in Indonesia. To initiate that effort, the research about growing various genotypes Jatropha in acid land was done. The objectives of this research was obtained a potential genotype-tolerant for acid land. The research was conducted at UPTD Technology Development Dryland Singabraja Village, Tenjo Subdistrict, Bogor, West Java, from November 2010 - August 2011. This research using Randomized Complete Design Group (RKLT) with one factor, ie genotype. The result showed that there were differences in growth between the genotypes Jatropha. Generally, there are five genotypes of Jatropha with the best growth in acid land (pH 5.0), ie Medan I-5-1, Dompu, IP-2P-3-4-1, Sulawesi, and Bima M.
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Judul: Pemanasan Sekunder Reaksi Fusi Plasma dengan Menggunakan Radio Frequency
Abstrak: Plasma merupakan bentuk ke-empat dari materi setelah padat, cair dan gas yang terbentuk dari proses ionisasi gas. Plasma dapat digunakan dalam reaksi fusi, yaitu reaksi penggabungan dua inti atom ringan menjadi inti atom yang lebih berat sambil melepaskan energi. Untuk mendapatkan energi dari reaksi fusi, inti yang akan direaksikan harus dipanaskan pada temperatur yang sangat ekstrem tingginya. Salah satu cara agar dapat mencapai kondisi ini adalah memberikan pemanasan tambahan atau pemanasan sekunder kepada plasma dalam reaksi fusi tersebut. Nilai daya serap rata-rata ion Deuterium yang sesuai dengan selang nilai daya dari data ITER adalah daya yang menggunakan frekuensi 50 MHz sampai dengan 60 MHz. Dengan menggunakan frekuensi 60 Hz diperoleh nilai daya rata-rata yang diserap sebesar 1,235.10-12 W.
Keyword: gelombang radio, pemanasan sekunder, plasma, reaksi fusi