Judul: Studi keragaman morfologi buah manggis (Garcinia mangostana L.) dari lima lokasi sentra produksi di Pulau Jawa
Abstrak: Mangosteen (Garcinia mangostana L.) is originated from Malaysia which was spread to the South East Asia region including Indonesia. Mangosteen has been reported perform apomixis reproduction, and it is due to mangosteen population in Indonesia presumably genetically homogen. The objective of the study is to evaluate variability pattern on fruit morphologies of mangosteen population from five locations of production center in Java Island, those are Leuwiliang (Bogor), Cantayan (Sukabumi), Wanayasa (Purwakarta), these are on West Java, Kaligesing (Purworejo) on Central Java, and Watulimo (Trenggalek) on East Java. Plant sample was taken 10 trees randomly from each location, subsequently 10 fruit samples taken randomly from each tree. Homogeneity of variance analysis was conducted with Bartlett test and followed with analysis of variance that employed to locul number, fruit weight, fruit length, peduncle length, fruit diameter, fruit length-diameter ratio, rind thickness, Total Soluable Solid (TSS), seed number, and fruit sap. Bartlett test analysis showed that for all of location, no variation was found on fruit weight, fruit length, fruit diameter, fruit length-diameter ratio, rind thickness, Total Soluable Solid (TSS), locul number and seed number, except peduncle length that has variation. Various variance pattern for population on all of location was arised on Total Soluable Solid (TSS), but on fruit diameter, locul number, and seed number the variance pattern were homogenous. Those result tends to assumption that the apomixis reproduction was happening on mangosteen, and if there were variation of fruits performance, its due to variation on environment conditions. These showed by means value of each of character.
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Judul: Studi Keragaman Morfologi Tanaman Dan Semaian Populasi Manggis (Garcinia Mangostana L.) Dari Tiga Sentra Produksi Di Pulau Jawa
Abstrak: The studies was aimed to evaluate genetic variability of mangosteen population from three production center of Java island, Wanayasa (West Java). Watulimo (East Java) and Gunung Walat (West Java) base on morphological characters of parent trees (leaf area index, leaf weight, canopy shape, stem ring), fruit characters (seed weight, fruit weight) and seedling performance (flush colour, plant height, number of leaves, flush rate, leaf area index, germination rate). The studies was carried out in the location of population for morphological character and at Tajur Bogor for seedling perfurmance since March to September 2002.
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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