Judul: Pengaruh Cara dan Lama Pengeringan Terna Nilam Terhadap Rendemen dan Mutu Minyak Nilam
Abstrak: One of problems of patchouli oil industry in Indonesia were the yield and the quality of patchouli oil that were still low. One of factors that affect the yield and the quality of patchouli oil is drying of patchouli herb before distillation. The research aim are to determine the effect of drying method and drying time on the yield and the quality of patchouli oil. The experimental design used in this study was factorial completely randomized design of (3 x 4) factosr with two replication. Factors used were the method of drying (dried patchouli without sunlight for 9 days, patchouli were dried in the sun for 2 hours and then aerated for 8 days, patchouli were dried in the sun for 4 hours then aerated for 5 days, patchouli were dried in the sun for 6 hours and then aerated for 4 days) and placement during drying (floor, shelf and hanging). Method of drying and drying time significantly affected moisture content of patchouli herb, refractive index, specific gravity, acid number, ester number and solubility in alcohol of patchouli oil, but its did not give significant effect on the yield, color, and optical rotation of patchouli oil. The longer of drying time tends to cause bulk density, optical rotation, and acid number of patchouli oil are increase, but the water content, solubility in alcohol, and ester number of patchouli oil are decreases. The best treatment in this research was drying of patchouli herb on the shelf and dried in the sun for 4 hours then aerated for 5 days, with the yield of 2.99%, water content of 15.12%, oil color is yellow, bulk density of 0.9676, refractive index of 1.5090, optical rotation of (-) 57.78, soluble in alcohol 90% with a ratio of 1:4, acid number of 2.239, ester number of 13.141, and patchouli alcohol content of 39.54%.
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Judul: Produktivitas Bahan Segar Dan Kadar Minyak Atsiri Tanaman Nilam (Pogostemon CABLIN Benth) Pada Berbagai Dosis Pupuk Nitrogen Dan Umur Pangkas
Abstrak: This research gowes to study the influence of various dosages nitrogen fertilizer and the days of prune against the production of fresh and patchouli essential oils. These experiment used Randomized Complete Block Design, two factors and three replications. The first factor is the dose of nitrogen derived from Urea fertilizer consisting of 0, 45, 90 and 135 kg N/ha. The second factor is the age prunning consisting of 60, 75 and 90 days after planting (DAP). The objective of experiment was conducted in IPB Experimental Station, Leuwikopo, Dramaga, Bogor in February to July 2011. Planting material used is 2 months old. The seedling of patchouli varieties derived from breeding Sidikalang Balittro Research, Cimanggu. The seedling were planted in the field with a spacing of 50 cm x 50 cm. Trials nitrogen fertilization is carried out twice, i.e. half dose of treatment in the planting and the rest is given 60 days after planting. The results showed that the height of the plant, the number of branches, the number of leaves, weights wet and dry weight highest harvest produced by the plant, which fostered 90 kg N/ha. The nitrogen fertilizer not affect leaf area index, while the highest levels of the oil produced by the plant without fertilizer nitrogen. The age of the real impact of the trim height, number of branches and leaves of patchouli plants. But the age of prune not affect the leaf area index, weights wet and dry weight of the harvest. The age of prune 90 HST producing plants with tall 62.2 cm or an average 7.9 % higher than the age of prune other, the number of branches 50.4 or an average 7.7 % higher than the age of prune other, and the number of strands of 170.2 leaves or average 7.8 % more than the age prune other. Highest patchouli oil content is at the age of prune 75 HST without a nitrogen fertilizer that is 2.19 %.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular