Judul: Kemiripan dan Potensi Produksi Aksesi Kenikir (Cosmos caudatus Kunth.) dari Beberapa Tempat di Jawa Barat
Abstrak: Kenikir has the potential to be developed as an alternative vegetable to meet market demand. However, in general, this kind of vegetable has not been widely known by the publican disusually found only in the local market. So far, there has been no research or information on the genetic diversity of this plant. It is, therefore, necessary to conduct the exploration activity to study the morphological characters of the kenikir in several areas in West Java. The objectives of this study were to observe similarity and production potential among the accessions of kenikir (Cosmos caudatus Kunth.) that has the potential to be developed in several places in West Java. This study consisted of two experiments. The first experiment was an exploration and similarity between accession of kenikir (Cosmos caudatus Kunth.) from several places in West Java. Observations were carried out based on the table characteristics of kenikir plant and cluster analysis was also conducted to determine the similarity among the kenikir accessions. The second experiment evaluated the production of several accessions of kenikir (Cosmos caudatus Kunth.) from several places in West Java. This experiment used a Randomized Complete Block Design with a single factor, namely 7 accession as a treatment. The results of the clusters analysis grouped 20 Cosmos accessions into three clusters. Cluster I and II consisted only one accession each which were AK 16 and AK14, respectively. Cluster III consisted of AK 9, AK 11, AK 10, AK 7, AK 8, AK 5, AK 6, AK 3, AK 19, AK 4, AK 3, AK 13, AK 20, AK 1, AK 18, AK 15, AK 2, AK 12 and AK 17. The main characteristic of cluster I were have spreading growth-type, strong stem anthocyanin colouration, ray florets tubular type and secondary color of ray floret distributed in quarter part of the plant. The main characteristic of cluster II were have semi upright growth type, medium stem anthocyanin colouration, ray florets ligulate type, secondary colour of ray floret distributed in the bottom part of the plants. The main characteristic of cluster III were have semi upright growth type, medium stem anthocyanin colouration, ray floret tubular type and secondary color distributed at the quarter part of the plants. In general, Dramaga (AK 14) and Ciaruten (AK16) accession showed that their production characters were better and more superior than those of the other accessions so that they were potential to be developed. Kenikir desired include those which have tall trees, large number of leaves, long and wide leaves, high yields and slow flowering.
Keyword: Characterization, cluster analysis, exploration

Judul: Kemiripan Dan Potensi Produksi Aksesi Kemangi (Ocimum Sp.) Dari Beberapa Tempat Di Jawa Barat
Abstrak: Sayuran indigenous dapat dijadikan sebagai sayuran alternatif pengganti sayuran komersial. Pemanfaatan sayuran indigenous dapat dilakukan melalui eksplorasi. Sayuran indigenous yang potensial untuk dikembangkan salah satunya adalah kemangi. Kemangi dapat dikonsumsi dalam bentuk segar dan sebagai obat-obatan. Penelitian ini merupakan langkah awal untuk mengembangkan salah satu sayuran indigenous ini menjadi varietas komersial. Tujuan penelitian untuk mengidentifikasi aksesi kemangi (Ocimum sp.) dari beberapa tempat di Jawa Barat dan mendapatkan informasi potensi produksi beberapa aksesi kemangi. Penelitian ini terdiri dari dua percobaan. Percobaan pertama adalah eksplorasi dan kemiripan antar aksesi kemangi (Ocimum sp.) dari beberapa tempat di Jawa Barat. Pengamatan dilakukan berdasarkan deskriptor tanaman kemangi, dan untuk mengetahui kemiripan antar aksesi kemangi dilakukan analisis gerombol. Percobaan kedua adalah evaluasi produksi berbagai aksesi kemangi (Ocimum sp.) dari beberapa tempat di Jawa Barat. Percobaan ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) faktor tunggal, yaitu 10 aksesi sebagai perlakuan. Hasil analisis gerombol aksesi dikelompokkan menjadi 4 gerombol. Gerombol I berjumlah 31 aksesi dan terdiri dari empat spesies kemangi yaitu Ocimum tenuiflorum L. (KM 2, KM 3, KM 5, KM 6, KM 7, KM 9, KM 10, KM 11, KM 13, KM 15, KM 16, 17, KM 18, KM 19, KM 20, KM 22, KM 25, KM 26, KM 32, KM 33 dan KM 34), Ocimum basilicum L. (KM 4), Ocimum gratissimum subsp. gratissimum (KM 8, KM 12, KM 14) dan Ocimum americanum L. (KM 24, KM 27, KM 28, KM 29, KM 30 dan KM 31). Gerombol II berjumlah satu aksesi yaitu KM 21 (Ocimum gratissimum subsp. gratissimum), gerombol III berjumlah satu aksesi yaitu KM 1 (Ocimum tenuiflorum L.), dan gerombol IV juga memiliki satu aksesi yaitu KM 23 (Ocimum basilicum L.). Ciri utama gerombol I adalah tidak terdapat warna antosianin batang, terdapat bulu batang, jumlah tunas yang berbunga pada batang lebih dari tiga, dan tidak terdapat warna antosianin pada bagian atas helai daun. Ciri utama gerombol II adalah kerapatan tanaman padat dan terdapat warna antosianin batang. Ciri utama gerombol III adalah kerapatan tanaman padat dan jumlah tunas yang berbunga pada batang berjumlah satu. Ciri utama gerombol IV adalah terdapat warna antosianin pada batang, tidak terdapat bulu pada batang, dan terdapat warna antosianin pada bagian atas helai daun. Secara umum 10 aksesi yang digunakan memiliki potensi untuk dikembangkan menjadi varietas. Aksesi KM 21 dan KM 22 memiliki 7 keunggulan dari 8 karakter yang diamati. Aksesi KM 2 dan KM 10 memiliki 6 keunggulan dari 8 karakter yang diamati. Aksesi KM 1, KM 4, KM 11, KM 25 dan KM 29 memiliki 5 keunggulan dari 8 karakter yang diamati, dan aksesi KM 23 memiliki 4 keunggulan dari 8 karakter yang diamati. Potensi panen kemangi berkisar mulai 4.61 ton ha-1 sampai dengan 9.63 ton ha-1.
Keyword: Analisis gerombol, Ocimum sp, sayuran indigenous.

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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