Judul: Perubahan Struktur dan Keanekaragaman Coleoptera pada Sistem Agroforestri Kakao: Pengaruh Umur dan Tataguna Lahan di Daerah Lore Lindu, Sulawesi Tengah
Abstrak: The conversion of forest to agricultural areas is usually associated with loss in biodiversity and its associated ecosystem services. However, some agricultural system such as agroforestry can conserve biodiversity through supporting suitable habitat which are similar to natural condition. The aim of this research is to study community structure of Coleoptera in cacao agroforestry system with emphasize on the effect of age and habitat condition surrounding cacao plantation. Ecological research was conducted in cacao plantation in Central Sulawesi with different type of shade trees i.e remaining forest trees (plot B), planted trees with diverse species (plot C) and planted trees with only 1 or 2 species (plot D). This research monitors the changes of biodiversity that had been conducted in 2003 and resampled in 2009 with the same method in the same plots as well as the same sampling time. In each agroforestry types, four trees were sampled and all the Coleoptera were collected using fogging method. The result of the research showed that the species richness of Coleoptera from three types of agroforestry decreased in composition and structure among the two time period. In 2003, there were 172 species compared to 111 species in 2009. However, there are not significant different between 2003 and 2009 species composition based on analysis of variance using Shannon index. In contrast, similarity analysis using Sorenson index showed that the species composition changed between 2003 and 2009. Age of cacao trees have important role on changing Coleoptera species composition. In addition, habitat condition with natural forest may support Coleoptera diversity in cacao plantation.
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Judul: Pengaruh isolasi terhadap dianmika struktur komunitas serangga dan keanekaragaman Hymenoptera parasitika dalam konteks waktu pada sistem agroforestri perkebunan kakao di tepi Taman Nasional Lore Lindu, Sulawesi Tengah
Abstrak: Effects of isolation on insect comunity strusture as well as diversity and abundance of parasitic Hymenoptera in cacao agroforestry systems were studied between February 2003 and April 2003. The research focused on two main aspect: (Chapter IV) effects of isolation of agroforestry system from remaining forest on temporal dynamic of insect communities in general, (Chapter V) temporal and spatial dynamic of parasitic Hymenoptera of cacao agroforestry system.
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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