Judul: The Diversity of Physical and Chemical Quality of Calina Papaya Fruit
Abstrak: Pepaya merupakan tanaman yang dapat berproduksi sepanjang tahun di Indonesia. Pepaya memiliki banyak varietas sehingga memiliki rasa, bentuk dan ukuran yang beragam. Keragaman pepaya unggul perlu dievaluasi sebagai upaya mempertahankan karakter kualitasnya. Tujuan penelitian ini mengkarakterisasi dan mengklasifikasi keragaman kualitas fisik dan kimia buah pepaya Calina. Metode pengambilan sampel menggunakan Metode Purposive Random Sampling dengan sampel sebanyak 50 pohon. Setiap pohon sampel diambil empat buah sehingga terdapat total 200 buah pepaya. Setiap pohon sampel diberi kode bentuk buah berdasarkan Descriptor for Papaya. Penelitian dilaksanakan di Kebun Pepaya Desa Babakan Lebak, Kelurahan Balumbang Jaya, Kecamatan Bogor Barat, Kota Bogor dan Laboratorium Pasca Panen Fakultas Pertanian IPB dari bulan April hingga bulan Juli 2022. Hasil percobaan menunjukkan terdapat keragaman bentuk dan rongga buah Pepaya Calina yaitu elongate, lengthened cylindrical, oval, dan globular dengan bentuk rongga round, irregular dan star. Pepaya Calina memiliki bentuk buah di ujung tangkai tipe depressed dan digolongkan sebagai buah pepaya berukuran kecil hingga sedang. Rongga buah pepaya berbentuk star memiliki bobot jumlah biji yang lebih tinggi. Buah berbentuk elongate dan lengthened-cylindrical memiliki bentuk sesuai dengan deskripsi pepaya Calina. Buah berbentuk globular memiliki nilai PTT paling tinggi (11,90 ⁰Brix) sedangkan buah berbentuk oval memiliki nilai PTT paling rendah (10,64 ⁰Brix). Kandungan vitamin C berkisar antara 123,89-127,14 mg/100g tidak berbeda nyata antar bentuk buah. Bobot buah berkorelasi positif dengan panjang, diameter, tebal daging buah, volume buah, dan bobot biji., Papaya is a plant that can grow all year round in Indonesia. Papaya has many varieties, so it has a variety of flavors, shapes, and sizes. The diversity of superior papaya in the field should be evaluated to maintain its quality character. The research purpose is to characterize and classify the diversity of physical and chemical qualities of Calina papaya. The sampling method used the Purposive Random Sampling Method with a sample of 50 trees, each tree sampled four papayas, so there were 200 total papayas. The sample tree is coded with a fruit shape based on the Descriptor for Papaya. The research was conducted from April to July 2022 at Papaya Gardens in Babakan Lebak Village, Balumbang Jaya Village, West Bogor District, Bogor City, and the Post-Harvest Laboratory of the Faculty of Agriculture, IPB. The results of the experiment showed that there were variations in the shape and cavity of the Papaya Calina, namely elongate, lengthened-cylindrical, oval, and globular with round, irregular and star cavity. Calina papaya has a fruit shape at the end of the stem of the depressed type and is classified as a small to medium-sized papaya fruit. The star-shaped papaya fruit cavity has a higher seed weight. The elongated and lengthened-cylindrical fruit has a shape according to the description of the Calina papaya Globular fruit has the highest PTT value (11.90 oBrix) while oval fruit has the lowest PTT value (10.64 oBrix). Vitamin C content ranged from 123.89-127.14 mg/100g not significantly different between fruit shapes. Fruit weight was positively correlated with length, diameter, flesh thickness, fruit volume, and seed weight.
Keyword: tropical fruit, characterization, classification, fruit quality

Judul: Growth, Production and Compatibility Evaluation of Grafted Calina Papaya (Carica papaya L.)
Abstrak: Pepaya (Carica papaya L.) merupakan salah satu tanaman buah tropis yang banyak diminati. Selain rasanya yang manis, buah pepaya mengandung beragam nutrisi penting untuk manusia seperti vitamin A, Vitamin C, asam folat, dan kalium. Salah satu kendala dalam budidaya tanaman pepaya di Indonesia adalah sulitnya mengidentifikasi kelamin tanaman pepaya pada fase vegetative. Sambung pucuk (grafting) merupakan langkah yang banyak digunakan untuk mengatasi masalah tersebut. Penelitian ini bertujuan untuk mengevaluasi efek sambung pucuk tanaman pepaya terhadap pertumbuhan, produksi dan kompatibilitas antara batang bawah dan batang atas. Penelitian ini dilaksanakan pada Kebun Tajur 2 milik PKHT di Tajur, Bogor, mulai dari Desember 2019 hingga Februari 2020 yang kemudian dilanjutkan dengan analisis dalam Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, IPB, mulai dari Juni 2020 hingga Agustus 2020. Penelitian ini mempelajari pertumbuhan tanaman hasil grafting dengan dua macam batang bawah yang berbeda, yaitu : batang bawah pepaya sukma (C-S) dan batang bawah pepaya liar (C-L) dengan batang atas varietas Calina (IPB 1). Secara keseluruhan penelitian ini menggunakan 64 tanaman yang diatur dalam 8 baris tanaman, setiap baris terdiri dari 8 individu tanaman. Sebanyak 5 baris tanaman merupakan tanaman hasil grafting dengan batang bawah pepaya sukma (C-L), dan tiga baris sisanya merupakan tanaman hasil grafting dengan batang bawah pepaya liar (C-L). Data yang diperoleh dianalisis menggunakan uji t-student dengan taraf 5% menggunakan program Minitab 19. Hasil pengamatan menujukkan bahwa tanaman C-L memiliki laju pertumbuhan yang lebih cepat dibandingkan tanaman C-S pada hampir seluruh parameter vegetatif, kecuali lingkar batang sambungan, lingkar batang bawah dan tinggi batang bawah. Tanaman C-L berbunga lebih awal dan memiliki lebih banyak bunga hermafrodit yang mampu memproduksi lebih banyak buah lonjong dibandingkan tanaman C-S. Buah dari tanaman C-L memiliki tingkat kelunakan daging, kekerasan kulit serta nilai Padatan Terlarut Total (PTT) yang lebih tinggi daripada buah yang dihasilkan oleh tanaman C-S. Kedua jenis batang bawah yang digunakan dalam penelitian ini tidak menunjukkan gejala inkompatibilitas., Papaya (Carica papaya L.) or pawpaw is one of the most widely enjoyed tropical fruits. Aside from its refreshing sweet taste, papaya fruit contains different kinds of beneficial nutrients for human body such as vitamin A, vitamin C, folic acid and potassium. One of many hurdles that hinder the papaya production is difficulties to identify plant sexes at the vegetative stage. Among other solutions, grafting is the most popular solution to overcome the aforementioned problem. This research aims to evaluate the effect of papaya grafting on their growth, production and compatibility between rootstock and scion. The research was conducted at PKHT’s 2nd field in Tajur, Bogor, from December 2019 until February 2020 and followed by lab analysis in Post Harvest Laboratory, Department of Agronomy and Horticulture, IPB, from June 2020 to August 2020. Data were analysed by ANOVA using Minitab 19; t-test with 5% level of significance were used to compare the data between two grafted plant groups with different rootstocks, i. e. Sukma (IPB 6) rootstock and wild papaya rootstock. Scion used in this research were from Calina variety (IPB 1). In total, there were 64 grafted plants, arranged in 8 rows with 8 individual plants per row. Five of
Keyword: quality, rootstock, Sukma papaya, TDS

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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