Judul: Penggunaan Kitosan dan Lilin Lebah sebagai Bahan Pelapis untuk Meningkatkan Masa Simpan dan Mempertahankan Kualitas Buah Pepaya
Abstrak: Papaya is a climacteric fruit with increased respiration rate during ripening process. Respiration rate papaya can be inhibited by providing a coating on the surface of the fruit. Coating materials that can be used include chitosan and beeswax. The purpose of this research is to study the effect of chitosan and beeswax coating on the shelf life and quality of Callina papaya fruit during storage. Experiment was carried from November 2014 until March 2015 at the Experimental Field of PKHT, Tajur and Postharvest Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University. The experimental design used was completely randomized design with 3 treatments and 3 replications, there are chitosan 0.75%, beeswax 6%, and the control (without coating). Data were analyzed by F test and treatments that affect were analyzed by Duncan Multiple Range Test (DMRT). Parameters measured were shelf life, the index of fruit skin color scale, respiration rate, weight loss, skin firmness, pulp firmness, total soluble solids, total titratable acids, and the content of vitamin C. Results of the experiments showed that chitosan and beeswax treatments can extend the shelf life of papaya Callina 4–5 days compared to control because it inhibits respiration rate papaya during storage. The use of chitosan and beeswax can maintain the physical and chemical quality of papaya fruit Callina.
Keyword: Callina, chemical quality, physical quality, postharvest ripening, respiration rate

Judul: Study of waxing on quality and storability of Callina papaya fruit
Abstrak: Pepaya (Carica papaya L.) merupakan salah satu buah-buahan tropika yang menjanjikan di pasar baik dalam maupun luar negeri, dan mempunyai nilai ekonomi yang cukup tinggi. Buah pepaya termasuk dalam jenis buah klimakterik.. Salah satu cara untuk menahan laju penurunan mutu dalam penanganan pascapanen buah-buahan adalah dengan pelilinan dan penyimpanan dingin.penelitian ini bertujuan untuk mempelajari pengaruh pelilinan terhadap kualitas dan daya simpan buah pepaya Callina pada suhu ruang dan suhu dingin (130C). Konsentrasi lilin yang digunakan adalah 0% (kontrol), 6%, dan 10% dengan metode pencelupan. Hasil penelitian menunjukkan bahwa buah pepaya dengan konsentrasi 10% pada suhu 130C mampu menekan laju respirasi, susut bobot, kekerasan, dan warna kulit buah pepaya. Namun, pelilinan tidak terlalu berpengaruh pada perubahan nilai TPT. Hasil uji organoleptik menunjukkan bahwa buah pepaya yang diberi lapisan lilin dengan konsentrasi 10% mampu mempertahankan tingkat kesukaan panelis. Begitu pula dengan uji pembobtan, kombinasi konsentrasi dan suhu terbaik yaitu pada buah pepaya dengan konsentrasi pelilinan 10% pada suhu 13 °C. Kekerasan buah termasuk parameter mutu kritis buah pepaya., Papaya (Carica papayaL.) is one of tropical fruits which economically good both in domestic and overseas. Papaya fruit is kind of climacteric fruit. One way to hold the rate of quality degradation in post-harvest handling is by waxing and cold storing. This research aim to learn the effect of waxing about quality and storability of Calina papaya at room temperature and cold temperature (13°C). Wax concentrations which was used were 0% (control), 6%, and 10% by dyeing method. The result showed that papaya with wax concentration 10% at 13°C could hold the rate of respiration, weight loss, hardness, and colour of fruit. However, waxing did not affect greatly on the changes of Total Dissolved Solid (TDS). Organoleptic result showed that waxed papaya in 10% of concentration was good according to the panelists. It also showed good result for weighting, good combination can be reached at 10% of wax concentration and 13°C of temperature. Hardness fruit including critical parameter of papaya.
Keyword: pepaya, pelilinan, suhu

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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