Judul: Pengembangan Sistem Pakar Pemilihan Varietas Tomat (Solanum lycopersicum L.) dengan Logika Fuzzy dan Faktor Pembobotan
Abstrak: The increasing number of tomato varieties with their unique features, has introduced higher subjectivity and complexity for selection of tomato varieties. This study developed Expert System Selection of Tomato Varieties (SIPMAT) to assist dissemination of knowledge related to the selection of tomato varieties. This system was also developed to help farmers to determine varieties that match with some parameters or user preferences. This expert system used 135 tomato varieties. Inference engine developed on the expert system using Tahani fuzzy logic rules combined with Simple Additive Weighting (SAW) as weighting rules. There are 9 parameters used for selection in the system including planting goals, altitude, resistance to diseases, fruit size, fruit shape, fruit hardness, yield potential, maturation and fruit color with weighting factor of each parameter according to experts and farmer preferences. The prototype was developed on web using PHP programming language and MySql for data base management system. The system was tested and it showed the accuracy of 86.2%.
Keyword: Bogor Agricultural University (IPB), tomato varieties, simple additive weighting, fuzzy, expert system

Judul: Evaluasi Daya Hasil 12 Genotipe Tomat (Solanum lycopersicum L.) dengan 3 Pembanding
Abstrak: The experiments was conducted to test resources yield of 12 genotype potential of tomatoes and get the genotype who has a higher yield and better qualities than commercial varieties. The experiments used Randomized Completely Block Design, single factor and three replications. The factor was 12 tomatoes genotypes potential and three commercial varieties (Intan, Ratna, dan Rampai) as a comparison. The results showed that there are potential tomatoes genotypes have good agronomic characters which genotype F6004001-8-16-14-1 and F6004001-8-16-14-7 (faster flowering and harvesting). F6004009-5-7-5-7 genotype showed a higher yield (1 032.63 g) than all genotypes, but not significantly different from the commercial varieties Intan (563.94 g), Ratna (666.85 g), and Rampai (640.85 g). On the character of total dissolved solids (PTT) and the hardness of fruit, F6005001-4-1-12-5 and F6005001-4-1-12-3 genotype have better quality than all the genotypes and commercial varieties. F6004009-5-7-5-7 genotype had the highest productivity value and potential to continue. The productivity was positively correlated with fruit weight and fruit thickness.
Keyword: variety, total dissolved solids, productivity, harvest, fruit hardness, Bogor Agricultural University (IPB)

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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