Judul: Intersepsi Radiasi Matahari dan Pertumbuhan Tanaman Cabai Merah pada Kondisi Tanpa Naungan dan Ternaungi
Abstrak: Applications of shading modifes the amount of radiation reaching the plants. This study was aimed to determine the influence of shading by paranet 50% and 75% on leaf area index (LAI), solar radiation use efficiency (RUE) and production of red pepper. For the duration of filed experiment of 127 days, total global radiation above the plant canopy in open areas was 1778 MJ/m², above the plant canopy in the shading by paranet 50% was 1629 MJ/m² and above the plant canopy in the shading by 75% was 1364 MJ/m². In plants without shading, the maximum value of LAI was 3.18 and the minimum was 0.75, while the maximum RUE was 2.8 g/MJ and minimum RUE was 1.5 g / MJ. In shading by paranet 50%, the maximum LAI was 2.75 and minimum LAI was 0.64, maximum RUE was 2.7 g/MJ and minimum RUE was 1.4 g/MJ. In plants with shading by paranet 75%, the maximum value of LAI was 2.58 and the minimum was 0.60, while the maximum RUE was 2.6 g/MJ and minimum RUE was 1.3 g/MJ. Plants under shading by paranet 75% only produced 7% of the biomass of plants without shading.
Keyword: red pepper, plant growth, paranet shading, Interception

Judul: Respon Tanaman Cabai Merah terhadap Arah Baris Tanam yang Berbeda
Abstrak: Seloka IPB is big red chili variety of a hybrid result between IPB C2 and IPB C5. This chili has harvest ageof 62 to 86 days after planting, has high productivity and is adaptedto lowland with an altitude of 100-250 masl. While Kopay chili variety is curly red chili from Payakumbuh, West Sumatra. Kopayhas harvest age of 80- 85 days after planting (in lowland) and 90-95 days after planting (in highland), has a high productivity, and has fruitslength of 30-35 cm. This research was aimed to analyze the effect of South-North (SN) and East-West (EW) row planting on radiation balance and on biomass production. The research was conducted from 23 February to 25 June 2014 in Climatological Station Class 1 BMKG Dramaga Bogor. The results showed that row planting direction significantly affected the number of leaves and total dry weight. Total global radiation above the plant canopy was 1712 MJ m-2. Interception of radiation in row direction of EW and NS amounted to 123.8 MJ m-2 and 132.7 MJ m-2, respectively. Radiation use efficiency (RUE) in row direction of NSwas between1.23 g/MJ (minimum) and 1.41 g/MJ (maximum); while in row direction of EWwas between 1.02 g / MJ (minimum) and 1.27 g/MJ (maximum). The row direction of NS was able to intercept radiation 7% larger than that of EW. In addition, the row direction of NSalso produced 24% more plant total biomass than the row direction of EW. It is concluded that planting inNSrow direction could utilize solar radiation more efficientlyand produce more biomass.
Keyword: Bogor Agricultural University (IPB), total biomass, RUE, radiation use efficiency, radiation balance, kopay, Seloka IPB

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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