Judul: Kriteria Kematangan Pascapanen Buah Pepaya Callina pada Umur Petik dan Umur Tanaman Berbeda
Abstrak: Harvesting and postharvest handling with good practices and timely can increase shelf life of fruit. This experiment aims to get the maturity criteria of postharvest ripeness, shelf life, and heat unit accumulation of Callina papaya of some harvesting date on different planting age. The experiment was conducted at the papaya farmer’s garden in Leuwisadeng, Bogor and Postharvest Laboratory, Department of Agronomy and Horticulture, Bogor Agricultural University in April to November 2014. The research was arranged by split plot randomized block design with 3 replication. The main plot was planting age while sub plot was harvesting date. The planting age at papaya population that was 9 and 15 months, while difference harvesting date of fruit that was 120, 125, 130, 135, and 140 Days After Anthesis. Planting age doesn’t effect criteria for post–harvest maturity of Callina papaya on 6 colour scale of skin fruit. Harvesting date effect the shelf life, skin fruit hardness, flesh fruit hardness, total soluble solid content, and vitamin C content. The best harvesting date was achieved in 125 DAA (heat unit accumulation 2 185.75 oC day) because the chemical quality and physical quality was good with the shelf life was 9 days. Callina papaya can be harvested on 120 DAA with heat unit accumulation 2 107.67 oC day. The longest shelf life for Callina papaya obtained at harvesting date 120 DAA with 10 days of shelf life that not different with harvesting date 125 DAA. The shortest shelf life for Callina papaya during 4–5 days obtained at harvesting date 135 and 140 DAA.
Keyword: Bogor Agricultural University, anthesis, physical quality, shelf life

Judul: Penentuan Umur Petik Pepaya Callina Berbasis Satuan Panas
Abstrak: Pepaya merupakan buah klimakterik yang memiliki daya simpan rendah. Penanganan pascapanen buah pepaya yang optimum dapat meningkatkan daya simpan. Tujuan penelitian ini untuk menentukan umur petik yang optimal dalam penanganan pascapanen primer. Penelitian dilaksanakan di Kebun Mekarsari, Kecamatan Rancabungur, Kabupaten Bogor pada bulan Februari 2016. Pengujian pasca panen dilaksanakan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor pada bulan Juni 2016. Percobaan menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) 5 perlakuan satuan panas yaitu 2.100, 2.150, 2.200, 2.250, dan 2.300 °C hari dengan 5 ulangan. Satuan panas 2.100 oC hari (umur petik 105 HSA) merupakan umur petik terbaik pepaya Callina untuk memperpanjang umur simpan dengan umur simpan terlama 10,60 hari. Satuan panas tidak mempengaruhi kualitas fisik dan kualitas kimia kecuali padatan terlarut total dan kandungan vitamin C pada tingkat kematangan pascapanen yang sama
Keyword: kematangan pepaya, kualitas fisik, kualitas kimia, umur simpan

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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