Judul: Analisis keragaan morfologi dan kualitas buah populasi nenas (Ananas comosus (L.) Merr.) queen di empat desa kabupaten Bogor
Abstrak: Pineapple (Ananas comosus (L.) Merr.) belongs to the Bromeliaceae, and it differentiated into five phenotypic groups, they are Cayenne, Queen, Spanish, Abacaxi and Maipure. Bogor Regency as one of pineapple producers in Indonesia, mainly produces Queen pineapple. The objective of the research is to study morphological performance and fruit quality of pineapple from Bogor Queen Pineapple population in four villages (Cipelang, Sukaharja, Tajur Halang and Sukaluyu). Sampling method was done based on Purposive Random Sampling Method from observed population which fulfil conditions.
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Judul: Keragaan morfologi dan kualitas buah pepaya dari empat populasi pepaya di Wilayah Bogor
Abstrak: Penelitian ini dilakukan dalam rangka mempelajari keragaan morfologi dan kualitas buah pepaya dari empat populasi pepaya di wilayah Bogor. Penelitian dilakukan di lahan petani. Buah yang diamati diambil dengan cara pengambilan contoh berdasarkan metode Purposive Random Sampling. Penelitian ini terdiri dari pengamatan kondisi umum kebun dan kondisi tanaman pepaya yang terdiri dari pengamatan peubah vegetatif, generatif dan kualitas buah. Pengamatan kondisi umum kebun, peubah vegetatif, dan peubah generatif dilakukan di empat kebun pepaya wilayah Bogor, yaitu di desa Cibodas kecamatan Bojong Genteng (Populasi 1), di desa Cibatok kecamatan Cibungbulang (Populasi 2). di desa Cibeuteung kecamatan Parung (Populasi 3), dan di desa Sukaraja kecamatan Sukaraja (Populasi 4) pada bulan Februari 2004. pengamatan kualitas buah dilakukan di laboratorium Pusat Kajian Buah-buahan Tropika pada bulan Maret- April 2004. Analisis data yang dilakukan yaitu Uji Kehomogenan Ragam, Analisis Cluster, dan Uji Korelasi. Berdasarkan peubah morfologi, populasi pepaya di desa Cibatok relatif lebih baik dan seragam jika dibandingkan dengan ketiga populasi lainnya karena memiliki jumlah daun banyak, panjang daun besar, lebar daun besar, panjang tangkai daun besar, dan diameter batang besar. ..
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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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