Judul: Penyimpanan Bibit Bawang Merah (Allium ascalonicum L.) pada Suhu Rendah dan Perlakuan Kadar Air Awal Untuk Mempertahankan Mutu
Abstrak: Bad post-harvest handling cause shallot damage and sprouting before the right time. Therefore the study of interaction initial moisture content and low temperature treatment is needed. The purpose of this research are to testing the effect of moisture content and low temperature of the damage and sprouting, and to knowing optimum moisture content and temperature to reduce the damage and sprouting. Methods of this research using some levels moisture content, there are ±85%, ±83%, dan ±81%, and then shallot seed stored at temperature 5°C and room temperature during 8 weeks. The result showed that interaction of moisture content and temperature had not significant effect on the sprouting, but significant effect on the damage. Optimum moisture content in the range of 80-85% can hold percentage of sprouting, but it cannot hold damage percentage. Percentage of damage is 19.8%. Temperature 5°C is the most optimal to reduce damage percentage, but the highest percentage of sprouting occurred at temperature 5°C. Percentage of sprouting is 4.8%.
Keyword: Bogor Agricultural University (IPB), shallot seed., moisture content, damage

Judul: Mempelajari sifat fisiologi pasca panen bawang merah (Allium ascalonicum L.) dan buah advokat (Persea americana Mill)
Abstrak: Penelitian ini bertujuan untuk mempelajari perubahan- perubahan sifat fisiologi bawang merah dan buah adpokat setelah dipanen, pada beberapa kondisi penyimpanan. Bawang merah disimpan pada suhu ruang dan suhu dingin selama 6 minggu. Buah adpokat disimpan pada suhu ruang dan suhu dingin dengan dan tanpa pelapisan lilin selama 14 hari. Perubahan sifat-sifat fisiologi yang dialami bawang merah pada suhu ruang adalah penurunan kadar air, pelunakan tekstur, penurunan kadar komponen volatil, penurunan laju respirasi dan peningkatan susut bobot. Nilai pH mengalami penurunan sampai minggu ketiga dan kemudian naik lagi sampai minggu keenam, sementara total asam relatif tidak mengalami perubahan. Kerusakan yang dijumpai pada bawang adalah busuk lunak dan berjamur untuk yang disimpan pada suhu ruang, dan keriput serta tumbuh akar untuk yang disim- pan pada suhu dingin. Penyimpanan bawang pada suhu dingin hanya berpengaruh nyata pada perubahan kadar air, kekerasan, laju respirasi dan susut bobot. Kadar air bawang yang disimpan pada suhu dingin menurun dari 85.27 persen menjadi 79.1 persen, sedangkan yang disimpan pada suhu ruang menurun dari 85.27 persen menjadi 81.7 persen. ...
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Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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