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: Heat Unit Optimization as Measured Harvest Criteria of Mas Kirana Banana (Musa acuminata AA Group)
Abstrak: Produksi pisang di Indonesia terus meningkat setiap tahun. Buah pisang merupakan buah klimakterik yang memiliki karakteristik mudah rusak sehingga dibutuhkan penanganan panen yang tepat. Penentuan waktu panen merupakan fase yang penting untuk dapat menghasilkan pisang dengan kualitas baik dan umur simpan yang panjang. Salah satu metode penentuan waktu panen yang terukur adalah dengan menggunakan akumulasi satuan panas. Percobaan ini bertujuan mengevaluasi satuan panas 650 °C hari setelah antesis sebagai kriteria panen terukur pisang Mas Kirana. Percobaan dilaksanakan di Kebun Percobaan Sukamantri IPB, Bogor, Jawa Barat, pada bulan Desember 2021 hingga Februari 2022. Analisis laboratorium dilakukan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura IPB pada bulan Januari hingga Maret 2022. Rancangan percobaan yang dilakukan adalah Rancangan Acak Lengkap (RAL) dengan faktor tunggal, yaitu waktu antesis, yang terdiri dari lima perlakuan. Hasil percobaan menunjukkan bahwa perbedaan waktu antesis pada pisang Mas Kirana yang dipanen dengan akumulasi satuan panas 650 oC hari setelah antesis secara umum tidak mempengaruhi kriteria panen, laju respirasi, kualitas fisik buah, dan kualitas kimia buah pada tingkat kematangan pascapanen yang sama, Banana production in Indonesia is increasing every year. Banana is a climacteric fruit that has perishable characteristics so that need to get the proper harvest handling. Determination of harvest time is an important phase to be able to produce bananas with good quality and long shelf life. One method of determining the measured harvest time is to use heat units. The objectives of this study were to evaluated the heat unit accumulation of 650 °C day after anthesis as a criterion for measurable harvest of “Mas Kirana” banana. The research was conducted at Sukamantri IPB Experimental Station, Bogor, in December 2021 to February 2022. Laboratory analysis was conducted in Postharvest Laboratory IPB in January to March 2022. The experimental design used was a Completely Randomized Design with a single factor, time of anthesis, which consisted of five treatments. The experimental results showed that the difference in the time of anthesis on Mas Kirana bananas harvested with the accumulation of heat units at 650 oC days after anthesis generally did not affect the harvest criteria, respiration rate, physical quality of the fruit, and chemical quality of the fruit at the same postharvest maturity level.
Keyword: anthesis, degree day, postharvest, shelf life

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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