Judul: Pengaruh Naungan dan Jarak Tanam terhadap Tanaman Soba di Dataran Menengah Kopo, Cisarua – Jawa Barat.
Abstrak: Buckwheat is a crop that has many benefits such as for alternatif food and sustainable agriculture in Indonesia. This study was conducted to determine the effect of shading and plant spacing on growth and development, radiation interception, radiation use efficiency and heat accumulation on buckwheat cultivar Harunoibuki. The experiment was conducted in May – Juli 2012 in Kopo Intermediateland, Cijulang, Cisarua, West Java at 600 meters above sea level. This study used nested experimental design with two factors and three replications; shading conditions of buckwheat: N0 (no shading) and N1 (shading by paranet 55%) as main factor; while plant spacing: P1 (200 plants/m2) and P2 (50 plants/m2) as second factor. Shading and plant spacing have significant effect on height, leaf number, and total dry mater of plant. Population density of 200 plants/m2 was able to intercept radiation 10 – 30% more than population density of 50 plants/m2. Radiation use efficiency on treatment of P1/N0, P2/N0, P1/N1, and P2/N1 were 3.11, 2.13, 2.76, and 2.65 g/MJ. Plants with the shading required 1380 0C day and plants without shading required 1239 0C day until harvest time. Plant without shading has double productivity compared to plant with shading.
Keyword: Buckwheat, cultivar Harunoibuki, heat accumulation, radiation use efficienc, yield components. Buckwheat

Judul: Pengaruh naungan dan jarak tanam terhadap Tanaman Soba di dataran tinggi Pasir Sarongge, Cianjur - Jawa Barat
Abstrak: Soba merupakan tanaman pangan yang memiliki banyak manfaat antara lain sebagai pangan alternatif dan cocok untuk pertanian berkelanjutan di daerah tropis. Penelitian ini dilakukan untuk mengetahui pengaruh naungan dan jarak tanam terhadap pertumbuhan dan perkembangan, intersepsi radiasi, efisiensi pemanfaatan radiasi dan akumulasi panas pada tanaman soba kultivar Harunoibuki. Penelitian dilakukan pada bulan Mei hingga Agustus 2012. Penelitian berlokasi di Pasir Sarongge, Cianjur-Jawa Barat pada ketinggian 1150 mdpl. Penelitian ini menggunakan rancangan petak tersarang dengan dua faktor dan tiga kali ulangan. Perlakuan naungan; N0 (tanpa naungan) dan N1 (naungan paranet 55%) sebagai faktor utama, sedangkan jarak tanam; P1 (2.5 cm x 20 cm) dan P2 (10 cm x 20 cm) sebagai faktor kedua. Hasil penelitian menunjukkan bahwa naungan dan jarak tanam berpengaruh nyata terhadap tinggi tanaman, jumlah daun, dan berat kering total. Perlakuan P1 mampu mengintersepsi radiasi 9 – 24% lebih banyak daripada P2, sedangkan N0 mampu mengintersepsi 3 –12% lebih banyak daripada N1. Efisiensi pemanfaatan radiasi pada perlakuan P1/N0, P2/N0, P1/N1, dan P2/N1 adalah 1.12, 1.22, 0.96, dan 1.19 g/MJ. Tanaman tanpa naungan membutuhkan akumulasi panas (sampai panen) 1126.4 C0 hari sedangkan tanaman ternaungi paranet 55% membutuhkan 1300.6 C0 hari. Penanaman soba di bawah kondisi naungan masih dapat dilakukan, tetapi komponen panennya menjadi lebih rendah dan batangnya lebih rentan rebah apabila terkena angin dan hujan.
Keyword: Buckwheat, Cultivar Harunoibuki, Dry matter production, Heat accumulation, Radiation use efficiency, Yield components

Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
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