Judul: Analisis stabilitas nonparametrik dan keragaan galur-galur harapan cabai (Capsicum annuum L.) pada 8 lingkungan
Abstrak: The objectives of this study were to compare nonparametric stability measures, and to identify promising high yield and stable of chili pepper (Capsicum annuum L.) genotypes at the eight environments. In every environment, the design was Randomized Complete Block Design with three replications. The method of Nassar and Huehn, Kang, Fox, and Thennarasu were used to analysis the stability and high yield. Spearman’s correlation and Principal Component analysisdistinguishes methods base on two different concept of stability : the static (biological) and dynamic (agronomic) concepts. Top method was categorized in the concept of dynamic stability. While the methods of Si1, Si2, Si3, Si6, Npi1, NPi2, NPi3 and NPi4 were categorized in the concept of static stability. Based on the ranking frequency stability of the nonparametric method, genotypes which have the highest frequency of static stability ranking were genotypes IPB002003, IPB002046, IPB009019 and Tit Super, whereas IPB009002 and Tombak were categorized as dynamic stability. Genotype IPB120005 and IPB019015 wereless adaptable in multiple environments tested. It shows that the genotypes were specific in certain environments. IPB120005 has high yield and specific location at Boyolali dry season withan average yield of 872.0 g and IPB019015 genotype was specific at Bogor wet season.
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Judul: Analisis Keragaman Genetik dan Stabilitas Daya Hasil Cabai Rawit di Tiga Lokasi
Abstrak: Cabai rawit merupakan komoditi strategis karena memiliki tingkat konsumsi yang tinggi dan berpengaruh pada tingkat inflasi. Tantangan pada produksi cabai adalah ketersediaan varietas yang berdaya hasil tinggi serta dapat beradaptasi di berbagai lingkungan tumbuh. Penelitian ini bertujuan untuk mengetahui keragaman morfologi 22 genotipe cabai, interaksi g x e, dan stabilitas 10 genotipe cabai rawit di 3 lokasi. Penelitian ini dilaksanakan pada bulan Juli 2020 sampai Februari 2022 pada tiga lokasi, yaitu Sleman, Bogor, dan Blitar. Penelitian ini menggunakan rancangan kelompok lengkap teracak dengan tiga ulangan. Genotipe cabai yang dievaluasi pada percobaan pertama adalah HCR 17-003, HCR 17-004, HCR 17-007, HCR 17-008, HCR17-012, HCR 17-013, HCR 17-014, HCR 17-017, F7-1, F7-2, F7-3, Ca011, Ca013, Ca020, Ca021, Cf002, Cf005, Cf007, Cf010, Cf015, Bonita, dan Loblita. Terdapat 10 genotipe yang digunakan untuk analisis stabilitas hasil, dua diantaranya berasal dari penelitian sebelumya berdasarkan kemiripan karakter morfologi, yaitu PKHT A, PKHT B, Bara, Genie, Centil, PKHT C, PKHT D, Bonita, Sona, dan Tunduk. Hasil analisis biplot terhadap 22 genotipe cabai menunjukkan total keragaman dari dua kompenen utama sebesar 40,5%. Terdapat interaksi genotipe dengan lingkungan yang berbeda nyata dengan produktivitas. Berdasarkan konsep stabilitas statis parametrik, genotipe yang tergolong stabil adalah PKHT B, PKHT C, Centil, Sona, dan Tunduk. Berdasarkan konsep stabilitas dinamis parametrik, genotipe yang tergolong stabil adalah PKHT A, PKHT B, PKHT C, Bonita dan Sona. Menurut metode AMMI, PKHT B, PKHT C, Sona, dan Bonita merupakan genotipe yang stabil di ketiga lokasi pengujian. PKHT B, PKHT C, Sona dan Bonita merupakan genotipe yang stabil di ketiga lokasi pengujian menurut AMMI. Berdasarkan konsep stabilitas nonparametrik, Bonita, PKHT C, PKHT A, dan Sona merupakan genotipe yang tergolong stabil di tiga lokasi menurut metode Kang. Genie, Bonita, Sona, dan PKHT B tergolong stabil menurut metode Nassar-Huehn. PKHT A dan Centil merupakan genotipe stabil menurut metode Fox. PKHT B merupakan genotipe stabil menurut metode Thennarasu. PKHT B dan Bonita merupakan genotipe stabil menurut semua metode stabilitas yang diuji., Cayenne pepper is an important horticultural commodity due to its high consumption and impact on inflation. Chili production faces challenges by the limited availability of high-yielding varieties, which have high adaptability to different growing environments. This study aimed to identify the variability of 22 chili pepper genotypes morphology, the genotype x environment interaction, and the stability of 10 chili pepper genotypes in 3 different environments. This study was conducted from July 2020 until February 2022 in Sleman DIY, Bogor, and Blitar. The experimental design used in this study was a single-factor randomized complete block design, each consisting of three replicates. The genotypes evaluated were HCR 17-003, HCR 17-004, HCR 17-007, HCR 17-008, HCR17-012, HCR 17-013, HCR 17-014, HCR 17-017, F7-1, F7-2, F7-3, Ca011, Ca013, Ca020, Ca021, Cf002, Cf005, Cf007, Cf010, Cf015, Bonita, and Loblita. Ten genotypes were evaluated in stability analysis, two genotypes were included from the previous experiment based on similar morphological character. They were PKHT A, PKHT B, Bara, Genie, Centil, PKHT C, PKHT D, Bonita, Sona, and Tunduk. The biplot analysis for genetic diversity showed a total diversity of 40.5% for the two main components. The genotype x environment
Keyword: AMMI, nonparametric stability, parametric stability, variety

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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