Judul: Postharvest Maturity Criteria of Uli Banana (Musa  sp. AA Group) at Several Harvesting Ages
Abstrak: Buah pisang merupakan buah yang dapat dipanen sepanjang tahun tanpa dipengaruhi oleh musim, jenis tanaman pisang sangat beragam dan beberapa diantaranya tumbuh dan dibudidayakan di kebun atau di pekarangan rumah, salah satunya adalah pisang Uli. Penelitian ini bertujuan mempelajari kriteria kematangan pascapanen pisang Uli dari beberapa umur panen dan menentukan waktu panen terbaik berdasarkan satuan panas yang diperoleh. Percobaan dilaksanakan di Kebun Percobaan Sukamantri dengan rancangan kelompok lengkap teracak faktor tunggal dengan 5 umur panen pisang. Pengamatan dilaksanakan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Buah pisang Uli dapat dipanen pada 90 hari setelah antesis (HSA) pada akumulasi satuan panas 1179 °C hari dengan umur simpan mencapai 13 hari setelah panen (HSP). Buah dengan umur panen lebih muda menghasilkan tingkat kematangan lebih lama dibandingkan buah yang dipanen lebih tua. Umur panen tidak memberikan pengaruh terhadap sifat fisik dan sifat kimia buah pada kematangan yang sama., Banana is a fruit that can be harvested throughout the year without being influenced by the season, the types of banana plants are very diverse and some of them grow and are cultivated in gardens or in the yards, one of which is Uli banana. This research aims to study the post harvest maturity criteria for Uli bananas from several harvest ages and determine the best harvest time based on the heat units obtained. The experiment was carried out at the Sukamantri Experimental Station with a single factor randomized complete group design with 5 banana harvest ages. Observations were carried out at the Postharvest Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural Institute. Uli banana fruit can be harvested at 90 days after anthesis (DAA) at an accumulated heat unit of 1179 °C days with a shelf life of up to 13 days after harvest (DAH). Fruit with a younger harvest yields a longer maturity than fruit harvested at an older age. Harvest age has no influence on the physical and chemical properties of fruit at the same maturity.
Keyword: laju respirasi, umur simpan, skala warna

Judul: Postharvest Character Study of Tanduk Banana (Musa paradisiaca, Group AAB) for Optimization of Heat Unit as a Measurable Harvest Criterion
Abstrak: Pisang, selain menjadi bahan pangan, memiliki arti yang penting bagi Indonesia karena memiliki nilai budaya dan sosio-ekonomi. Pisang memiliki keunggulan sebagai komoditas yang relatif mudah dan murah untuk dibudidayakan. Buah pisang mudah diolah dan dikonsumsi oleh rumah tangga. Penelitian ini dilaksanakan untuk menilai ketepatan umur panen berdasarkan hari setelah antesis (HSA) yang dikonversi ke satuan panas sebagai kriteria panen terukur untuk pisang Tanduk. Percobaan dilaksanakan di Kebun Percobaan Sukamantri, Bogor, Jawa Barat pada ketinggian 550 meter di atas permukaan laut sejak bulan Januari 2020 hingga Mei 2020. Pengujian kualitas pascapanen pisang Tanduk dilaksanakan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor hingga bulan Agustus 2020. Penelitian ini dilakukan dengan rancangan acak lengkap dengan 5 ulangan untuk menguji 5 umur panen: 50, 55, 60, 65, dan 70 HSA. Umur panen tersebut setara dengan akumulasi satuan panas: 965, 1067, 1134, 1201, dan 1297 ˚C hari. Hasil percobaan menunjukkan bahwa perbedaan umur panen tidak mempengaruhi umur peram, kualitas fisik, dan kualitas kimia buah pisang Tanduk, kecuali susut bobot buah., Banana, aside from being a food ingredient, is important to Indonesia because it has cultural and socio-economic value. Banana has the advantage of being a commodity that is relatively easy and inexpensive to be cultivated. The fruit is not difficult to be processed and consumed by the household. This research is done to evaluate the accuracy of harvest using days after anthesis (DAA) converted into heat unit as the measurable harvest criteria for Horn banana. The experiment was carried out in Sukamantri Experimental Plantation, Bogor, West Java at an altitude of 550 m above sea level from January 2020 to May 2020. Postharvest quality testing of Horn bananas was carried out in Postharvest Laboratory, Department of Agronomy and Horticulture, Agricultural Faculty, IPB University until August 2020. This research was conducted in a completely randomized design with 5 replications to test 5 harvest ages: 50, 55, 60, 65, and 70 DAA. Those harvest ages are equivalent to the accumulated heat unit of: 965, 1067, 1134, 1201, and 1297 ˚C day. Experimental results show that difference in harvest age did not affect storage life, physical qualities, and chemical qualities, except for fruit weight loss.
Keyword: antesis, hari setelah antesis, pascapanen, susut bobot, umur peram, anthesis, days after anthesis, post-harvest, storage life, weight loss

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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