Judul: Horticulture characters evaluation of IPB ornamental pepper lines at the leuwikopo experimental field
Abstrak: Penelitian ini bertujuan untuk mengevaluasi beberapa sifat vegetatif dan generatif dari galur cabai hias baru IPB. Penelitian ini dilaksanakan di Kebun Percobaan Leuwikopo, Dramaga, Bogor pada bulan Januari hingga Juli 2014. Bahan tanam yang digunakan adalah dua galur cabai hias IPB yaitu Seroja dan Ungara serta tiga varietas pembanding yaitu Explosive, Numex, dan Bara. Penelitian menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan empat ulangan. Hasil penelitian menunjukkan galur-galur yang diuji memiliki perbedaan pada semua karakter kuantitatif yang diuji. Galur Ungara memiliki keunggulan pada karakter tinggi tanaman, diameter batang, bobot per buah, diameter buah, dan ketebalan kulit buah. Galur Seroja memiliki keunggulan pada karakter umur berbunga dan umur panen buah yang lebih cepat. Karakter-karakter kualitatif antara galur-galur yang diuji tidak menunjukkan banyak perbedaan dengan pembandingnya. Karakter kualitatif yang dapat mencirikan masingmasing galur dapat dilihat dari karakter pemendekan ruas dan perubahan warna buah. Karakter pemendekan ruas dimiliki oleh galur Seroja. Perubahan warna buah muda ke buah masak pada galur Seroja adalah dari hijau kekuningan ke merah, sementara pada galur Ungara dari ungu kehitaman ke merah., The objective of this research was to evaluate several vegetative and generative characters of the new IPB ornamental pepper lines. The experiment was conducted at IPB experimental field, Leuwikopo, Dramaga, Bogor in January to July 2014. Planting material used was two IPB ornamental pepper lines, namely Seroja and Ungara, and three control varieties, namely Explosive, Numex, and Bara. The design used was a randomized complete block design with four replications. The results showed that there are significant differences for all quantitative characters among the observed new lines of ornamental pepper. Ungara had higher plant height, stem diameter, weight per fruit, fruit diameter, and flesh thickness than the control varieties. Seroja had earlier flowering time and harvest time than the control varieties. The qualitative characters between the observed lines and the control varieties are similar. Seroja line showed a shortened internode which is the same as one of the control varieties Explosive. In colour changes during ripening, Seroja line is yellowish-green when the fruits are immature and finally red when its mature. Ungara line start out deep purplish black and then turn green before maturing to red.
Keyword: cabai hias, generatif, Seroja, Ungara, vegetatif

Judul: Uji Daya Hasil dan Evaluasi Keragaan Sepuluh Galur Harapan Tanaman Cabai Besar (Capsicum annuum L.) IPB
Abstrak: Cabai besar (Capsicum annuum L.) merupakan salah satu komoditas hortikultura terpenting yang banyak dibudidayakan dan dikonsumsi oleh masyarakat Indonesia. Hal ini menjadikan pemuliaan tanaman cabai perlu terus dilakukan terutama dalam menghadapi tantangan perubahan iklim dan peningkatan manusia yang pesat. Penelitian ini bertujuan mengevaluasi daya hasil dan keragaan dari sepuluh galur harapan cabai besar IPB. Penelitian dilaksanakan pada September 2022 hingga Maret 2023 di Kebun Percobaan Leuwikopo IPB dan Laboratorium Pemuliaan Tanaman, IPB Dramaga, Bogor, Jawa Barat. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal dengan tiga ulangan. Bahan tanam yang digunakan terdiri dari sepuluh galur harapan IPB dengan tiga varietas pembanding yaitu Arisa IPB, Anies IPB, dan Seloka IPB. Hasil penelitian menunjukkan bahwa perlakuan genotipe berpengaruh nyata terhadap seluruh karakter yang diamati kecuali diameter batang. Galur cabai besar yang diuji memiliki potensi untuk dilepas menjadi varietas unggul baru karena menunjukkan hasil yang sama atau lebih baik dari varietas pembanding. Dari kesepuluh galur yang diuji, galur F4.317375-3-1 berpotensi untuk menjadi calon varietas unggul baru karena memiliki jumlah buah total per tanaman yang banyak (70,46 buah), bobot buah total per tanaman yang tinggi (483,71 g), umur berbunga (30 HST) dan umur panen (75 HST) yang cepat, produktivitas tanaman tinggi (9,5 ton ha-1), potensi hasil tinggi (16,32 ton ha-1) yang setara atau lebih baik dari varietas pembanding., Chili pepper (Capsicum annuum L.) is one of the most important horticultural commodities cultivated and consumed by the Indonesian people. This makes the breeding of chili pepper plants an ongoing necessity, especially in the face of the challenges posed by climate change and rapid population growth. This research aims to evaluate the yield and performance of teen lines chili pepper IPB. The research was carried out from September 2022 to March 2023 at the Leuwikopo Experimental Garden of IPB and Plant Breeding Laboratory, IPB Dramaga, Bogor, West Java. This study used a Randomized Complete Block Design (RCBD) with a single factor and three replications. The plant material consisted of teen lines IPB and three comparison varieties of chili were Arisa IPB, Anies IPB, and Seloka IPB. The results of the study showed that the genotype treatment had a significant effect on all observed traits except stem diameter. The tested chili pepper lines demonstrated potential for release as new superior varieties, as they exhibited similar or better performance compared to the reference varieties. Among the teen tested lines, F4.317375-3-1 showed potential as a candidate for a new superior variety due to its high total fruit yield per plant (70.46 fruits), total fruit weight per plant (483.71 g), early flowering (30 DAS), early harvest (75 DAS), high plant productivity (9.5 tons/ha), and high yield potential (16.32 tons/ha), which were either equivalent or better than the reference varieties
Keyword: cabai besar, evaluasi, galur, karakter, varietas pembanding

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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