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: Profil Vertikal Suhu dan Akumulasi Panas Tanaman Cabai Merah pada Kondisi Ternaungi dan Tidak Ternaungi
Abstrak: Red pepper (Capsicum annuum L.) is an economically high valued plant which its selling influenced by physical factors such as quality and appearance. Air temperature affects heat unit response and plant phenology which can be used to determine planting period on various environment temperature condition, starting from seed planting until harvesting period. This research aimed to observe temperature and relative humidity vertical profiles around plant canopy and to analyse paranet shading influence toward heat unit and phenology of red pepper plant. The result shows air temperature and relative humidity vertical profile around plant canopy are fluctuative as having lapse rate and inversion pattern at each height.Heat unit of non-shaded and 50%-shaded red pepper plant are 1750 Coday and 2005 Coday respectively (15% greater than without shading). As a whole, using of paranet shading can decrease air temperature by 0.3 oC. Red pepper plant is unsuitable to be planted using 75%-shading because its generative phase become obstructed
Keyword: phenology, shading., red pepper (Capsicum annuum L.), heat unit, air temperature vertical profile

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.
Keyword: