Judul: Morphological Characterization of Flower and Fruit in Five Eggplant Varieties (Solanum melongena L.)
Abstrak: Karakterisasi morfologi bunga dan buah perlu dilakukan untuk mengetahui karakter-karakter unggul yang dimiliki oleh setiap varietas terung. Penelitian dilaksanakan pada Bulan Juli hingga Desember 2023 di rumah plastik Cikabayan dan Laboratorium Mikroteknik IPB Dramaga terhadap terung varietas Provita F1, Mustang F1, Laguna F1, Torino, dan Bruno. Provita F1 memiliki morfologi bunga dan buah yang paling berbeda karena merupakan terung silindris bulat (terung lalapan), sedangkan lainnya merupakan terung silindris memanjang (lonjong). Setiap bunga mengandung antera yang dapat dimanfaatkan untuk menginduksi androgenesis. Antera yang paling sesuai sebagai bahan tanam pada kultur antera adalah antera yang banyak mengandung fase uninukleat akhir dan binukleat awal. Ukuran bunga Provita F1 yang sesuai sebagai eksplan kultur antera adalah bunga berukuran 11–15 cm, sedangkan empat varietas lainnya berukuran 17–20 cm. Bunga dengan fase tersebut ditemukan dalam ukuran yang berbeda pada tiap varietas. Provita F1 menunjukkan jumlah buah per tanaman terbanyak tetapi dengan panjang buah terpendek. Kelima varietas menunjukkan diameter, bobot per buah, dan bobot buah per tanaman yang sama. Bunga dan buah kelima varietas terlihat memiliki morfologi yang berbeda-beda. Perbedaan tersebut disebabkan oleh faktor genetik., Morphological characters of flower and fruit need to be described to determine the superior characters possessed by each eggplant variety. The research was carried out from July to December 2023 at plastic house in Cikabayan and Microtechnical Laboratory, IPB University. Genotype used were Provita F1, Mustang F1, Laguna F1, Torino and Bruno. Provita F1 had the most different flower and fruit morphology because it had a round cylindrical fruit, while the others had elongated cylindrical (oval) fruit. Each flower contained anthers which could be used to induce androgenesis. The most optimum anther stage suitable as planting material for anther culture was anther containing late uninucleate and early binucleate pollen, Provita F1 at flower size 11–15 cm, while other varieties at flower size 17–20 cm. Provita F1 showed to have the highest number of fruit per plant and the shortest fruit length. All five varieties appeared to have the same fruit diameter, individual fruit weight, and fruit weight per plant. The flower and fruits of the five varieties appeared to have different morphologies. The difference may be caused by genetic factors.
Keyword: terung, varietas, bunga, buah, morfologi

Judul: Growth and Yield of Several Eggplant Varieties (Solanum melongena L.) in Plastic House
Abstrak: Terung merupakan salah satu komoditas sayuran yang banyak diminati masyarakat. Produktivitas terung nasional juga terus mengalami peningkatan dari tahun ke tahun. Penggunaan varietas unggul merupakan salah satu upaya dalam menjaga kestabilan produksi terung. Penelitian ini bertujuan mengetahui penampilan karakter pertumbuhan dan hasil beberapa varietas terung di rumah plastik. Penelitian dilakukan di rumah plastik Kebun Percobaan Cikabayan, Institut Pertanian Bogor selama bulan Juli hingga November 2023. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) dengan menggunakan 6 varietas (Hitavi, Garnet, Provita, Mustang, Laguna, dan Torino) dan terdiri atas 4 ulangan. Penggunaan beberapa varietas unggul menunjukkan keragaman pada hasil pengamatan vegetatif dan generatif. Keragaman tersebut terdapat pada karakter diameter batang, panjang daun, lebar daun, dan rata-rata bobot per buah. Diameter batang berkisar antara 2,07 cm (Provita) hingga 2,84 cm (Torino). Panjang daun berkisar antara 42,73 cm (Provita) hingga 52,78 cm (Laguna). Lebar daun berkisar antara 31,48 cm (Provita) hingga 41,45 cm (Torino). Bobot per buah berkisar antara 41,13 g/buah (Provita) hingga 96,75 g/buah (Laguna). Produktivitas tanaman berkisar antara 0,96 kg/tanaman (Provita) hingga 2,53 kg/tanaman (Laguna). Pertumbuhan dan hasil panen yang tidak optimal disebabkan oleh suhu tinggi, serangan hama kutu putih serta tungau merah pada tanaman., Eggplant is a vegetable crop in great demand. National eggplant productivity continues to increase from year to year. The use of superior varieties is needed to maintain the stability of eggplant production. This research aims to determine the growth characteristics and yields of several eggplant varieties in the plastic house. The research was conducted in the plastic house of the Cikabayan Experimental Station, Bogor Agricultural University from July to November 2023. It used a randomized complete block design using 6 varieties (Hitavi, Garnet, Provita, Mustang, Laguna, and Torino) and replicated 4 times. The use of several superior varieties showed variability in vegetative and generative characters. The variability was found in the characters of stem diameter, leaf length, leaf width, and average weight per fruit. Stem diameters ranged from 2.07 cm (Provita) to 2.84 cm (Torino). Leaf length ranged from 42.73 cm (Provita) to 52.78 cm (Laguna). Leaf width ranged from 31.48 cm (Provita) to 41.45 cm (Torino). The weight per fruit ranged from 41.13 g/fruit (Provita) to 96.75 g/fruit (Laguna). Plant productivity ranged from 0.96 kg/plant (Provita) to 2.53 kg/plant (Laguna). Suboptimal growth and crop yields were caused by high temperatures and attacks of mealybugs and red mites on plants, so the cultivation environmental conditions and selection of superior varieties need to be considered in order to obtain optimal yields
Keyword: Characterization, eggplant, plastic house, varieties

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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