Judul: Evaluation of Variability and Yield on Cayenne Pepper Genotypes (Capsicum frutescens L.) Collection of PKHT IPB
Abstrak: Cabai rawit (Capsicum frutescens L.) merupakan hortikultura yang bernilai ekonomi tinggi di Indonesia. Tingginya permintaan akan meningkatkan permintaan produktivitas tanaman. PKHT IPB memiliki koleksi beberapa sumberdaya genetik cabai rawit yang perlu dievaluasi keragaman genetik dan karakteristik genotipenya untuk pengembangan selanjutnya. Penelitian ini bertujuan mengevaluasi keragaman dan daya hasil genotipe cabai rawit koleksi PKHT IPB. Penelitian dilaksanakan pada bulan Desember 2021 sampai Juni 2022 di Kebun Percobaan Pasir Kuda. Sembilan genotipe (HCR 17-002, HCR 17-003, HCR 17-006, HCR 17-009, CRP 2, CRP 4, CRP 5, CRP 7, dan Bonita) disusun menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan tiga ulangan. Terdapat keragaman karakter kualitatif genotipe uji, kecuali bentuk penampang batang, posisi dan bentuk bunga, serta bentuk biji. Analisis sidik ragam menunjukkan keragaman antara genotipe yang dievaluasi, kecuali diameter batang, jumlah buah per tanaman, bobot buah per tanaman, dan persentase jumlah buah rusak per tanaman. HCR 17-003 menunjukkan karakter lebar buah, bobot buah, jumlah biji per buah, bobot 1000 biji, dan bobot buah per tanaman yang lebih tinggi dibandingkan dengan varietas Bonita, serta bobot buah per bedeng dan produktivitasnya sebanding dengan varietas Bonita. HCR 17-006 memiliki panjang buah yang lebih panjang dibandingkan dengan varietas Bonita dan CRP 7 memiliki jumlah buah per tanaman yang lebih banyak dibandingkan dengan varietas Bonita., Cayenne pepper (Capsicum frutescens L.) is high economic value horticultural in Indonesia. The high demand for demand increase of crop productivity. PKHT IPB has a collection of genetic resources of cayenne pepper that the genetic variability and genotype characteristics need to evaluate for further development. This study aimed to evaluate the diversity and yield components of the PKHT IPB’s cayenne pepper. The research was conducted from December 2021 to June 2022 at PKHT IPB Pasir Kuda Experimental Field. Nine genotypes (HCR 17-002, HCR 17-003, HCR 17-006, HCR 17-009, CRP 2, CRP 4, CRP 5, CRP 7, and Bonita) were arranged under a Randomized Complete Block Design (RCBD) with three replications. The genotype qualitative characteristics varied except to the stem cross-sectional shape, the flower shape and position, and the seed’s shape. The analysis of variance showed a significant difference among evaluated genotypes except for stem diameter, fruits number per plant, fruit weight per plant, and percentage of defect fruit per plant. HCR 17-003 showed fruit width, fruit weight, the number of seeds per fruit, 1000 seeds, and the weight of fruit per plant higher than the Bonita variety, and weight per plot and productivity compare to Bonita's. HCR 17-006 has a longer fruit length than the Bonita variety and CRP 7 has a greater number of fruits per plant than the Bonita variety.
Keyword: productivity, qualitative character, quantitative character

Judul: Growth and Yield Evaluation of IPB Cayenne Pepper Capsicum annnum L. and Capsicum frutescens L.
Abstrak: Cabai rawit merupakan salah satu komoditas hortikultura yang penting dan mempunyai nilai ekonomi tinggi bagi masyarakat Indonesia. Tujuan penelitian ini adalah untuk mengevaluasi pertumbuhan dan daya hasil genotipe-genotipe cabai rawit spesies Capsicum annuum L. dan Capsicum frutescens L. Rancangan percobaan yang digunakan adalah rancangan kelompok lengkap teracak (RKLT) satu faktor dengan tiga ulangan. Bahan tanam yang digunakan adalah lima genotipe cabai rawit Capsicum annuum L. (F12.145291-10-7-1-1-2-1-3-6-1-3, F13.160291-3-12-5-51-1-1-2-2-1-1-5, F9.145291-14-9-3-12-1-1-2, serta varietas pembanding komersil Bara dan Genie) dan tujuh genotipe cabai rawit Capsicum frutescens L. (F1.285290, F1.340290, F1.372340, F1. 373340, Shadiva, serta varietas pembanding komersil Rawita F1 dan Bonita). Galur F9.145291-14-9-3- 12-1-1-2 memiliki panjang buah, tebal daging buah, bobot per buah, serta bobot buah per tanaman yang lebih tinggi daripada varietas pembanding. Galur F12.145291-10-7-1-1-2-1-3-6-1-3 memiliki diameter buah, bobot per buah, dan bobot buah per tanaman yang lebih tinggi dari varietas pembanding. Hibrida F1.285290 memilliki jumlah buah per tanaman yang jauh lebih banyak dibandingkan dengan varietas pembanding. Galur uji Shadiva memiliki bobot per buah yang lebih baik daripada varietas pembanding., Cayenne pepper is one of the important horticultural commodities and has high economic value for the people of Indonesia. The aim of the experiment was to evaluate the growth and yield of cayenne pepper genotypes of Capsicum annuum L. and Capsicum frutescens L. species. The experimental design used was a onefactor randomized complete block design (RCBD) with three replications. Plant materials that used were five genotypes of cayenne pepper Capsicum annuum L. (F12.145291-10-7-1-1-2-1-3-6-1-3, F13.160291-3-12-5-51-1-1-2-2-1-1-5, F9.145291-14-9-3-12-1-1-2, and commercial comparison varieties Bara and Genie) and seven genotypes of cayenne pepper Capsicum frutescens L. (F1. 285290, F1.340290, F1.372340, F1.373340, Shadiva, and commercial comparison varieties Rawita F1 and Bonita). The F9.145291-14-9-3-12-1-1-2 line produced higher fruit length, flesh thickness, weight per fruit, and fruit weight per plant than the comparison varieties. The F12.145291-10-7-1-1-2-1-3-6-1-3 line had higher fruit diameter, weight per fruit, and fruit weight per plant than the comparison varieties. The F1.285290 hybryd had much higher number of fruits per plant than the comparison variety. Shadiva test line had a better weight per fruit compared to comparison variety.
Keyword: cayenne pepper, genotype, variety, vegetable, yield

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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