Judul: Daya Hasil Galur Harapan Tomat (Solanum lycopersicon L.) di Dataran Rendah
Abstrak: The objective of this experiment was to evaluate yield for tomato’s lines (Solanum lycopersicon L.) at lowland. The experiment was conducted at PKHT Experimental Field, Tajur, Bogor in January-April 2013. Experiments used randomized completely block design, single factor and three replications. The factor was genotype that consisted of IPB T3-8-3, IPB T8-5, IPB T30-4-3, IPB T33-1-3, IPB T34-7-10, IPB T43-6-8, IPB T53-3-1, IPB T57-3, IPB T60-2-2, IPB T64-2-3, IPB T65-6, IPB T78-10 genotypes, and three comercial varieties (Intan, Ratna dan Karina) as controls. The results showed that the genotypes significantly affect the overall character. IPB T65-6 and IPB T64-2-3 were genotypes that showed no different performance for fruit width, fruit length, fruit weight, fruit flesh density, total dissolved solid, and vitamin C content compared with comercial varieties as controls. Days of harvesting of IPB T65-6 was earlier than comercial varieties. Agronomically, IPB T65-6 genotype which planted in lowland at Bogor had same yield compared with Ratna and Karina as control. Heritability (high) observed among all characters indicated that genetic factors give more contribute in determining the phenotypic variability of plant. All genotypes had close relationship, shown by the form of seven clusters with 89 % similarity. Factor of yield component was positively correlated with productivity. All genotypes were well adapted in lowland at Bogor.
Keyword: yield evaluation, Solanum lycopersicon L, lowland, line, comercial varieties

Judul: Uji Daya Hasil Tomat (Solanum lycopersicum L.) Koleksi PKHT IPB di Tajur
Abstrak: Tomat merupakan komoditas hortikultura yang bernilai ekonomi serta bermanfaat bagi kesehatan tubuh manusia. Konsumsi tomat meningkat seiring dengan peningkatan kesadaran masyarakat akan pola hidup sehat. Populasi tomat di dataran tinggi mulai terbatas akibat persaingan dengan komoditas pertanian lainnya. Oleh karena itu, diperlukan perluasan populasi tomat kedataran rendah. Namun, memiliki kendala yaitu kesesuaian iklim, produktivitas, kualitas buah, ketahanan terhadap hama dan penyakit, sehingga pemuliaan tanaman tomat adaptif dataran rendah perlu dilakukan. Penelitian ini bertujuan untuk menguji daya hasil genotipe tomat (Solanum lycopersicum L.) koleksi PKHT IPB di dataran rendah. Percobaan dilaksanakan di kebun percobaan Tajur PKHT IPB, pada bulan Januari hingga April tahun 2013. Percobaan menggunakan rancangan kelompok lengkap teracak, satu faktor dan tiga ulangan. Faktor tersebut adalah genotipe tomat yang terdiri dari genotipe IPBT3, IPBT8, IPBT30, IPBT33, IPBT34, IPBT43, IPBT53, IPBT57, IPBT60, IPBT64, IPBT78 serta tiga varietas komersil (Intan, Karina dan Ratna) sebagai pembanding. Hasil penelitian menunjukan bahwa genotipe berpengaruh nyata terhadap keseluruhan karakter uji kecuali diameter batang. Genotipe tomat yang memiliki daya hasil lebih baik dari varietas pembanding Intan dan Karina adalah IPBT57 dan IPBT64. Karakter panjang daun, umur berbunga dan bobot buah pertanaman berkorelasi positif terhadap produktivitas tanaman. Genotipe tomat yang diuji beradaptasi cukup baik dilokasi uji coba., Tomato is a horticultural commodity that has economic value and is beneficial for the health of the human body. Consumption of tomato is increasing along with increasing public awareness of healthy lifestyle. Tomato population in the highland is starting to be limited due to competition with other agricultural commodities. Therefore, expending the lowland tomato is a necessity. However, it has constraints that are climate suitability, productivity, fruit quality, resistance to pests and diseases, so that the breeding of lowland adaptive tomato plants needs to be done. The research aimed to obtain the yield information of tomato genotype collection of PKHT-IPB. The experiment was conducted at Tajur, Bogor from January till April 2013. The experiment used a randomized complete block design, single factor and three replications. The factor was genotype that consisted of IPBT3, IPBT30, IPBT33, IPBT34, IPBT43, IPBT53, IPBT57, IPBT60, IPBT64, IPBT78 genotypes, and three comercial varieties (Intan, Karina and Ratna) as controls. The results showed that the genotypes significantly affected the overall character except for the stem diameter character. Tomato genotypes that had a better yield ability than commercial varieties Intan dan Karina were IPBT57 and IPBT64. Character of leaf length, flowering age and fruit weight were positively correlated with plant productivity. The tomato genotypes tested adapted quite well in the trial locations.
Keyword: dataran rendah, genotipe, produktivitas

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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