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: Uji Keragaan Pepaya IPB 9 di Tiga Lokasi di Kabupaten Bogor
Abstrak: This research was aimed to study the morphology characters and fruit quality of population of papaya IPB 9 at three locations in Bogor regency. This research was done on October 2009 until March 2010 and the three locations of papaya are the in Tajur Experimental Field as a first location, the second location is Kampung Tali Kolot, Cimande, Caringin district, and the last location is Kampung Lengis, Warung Menteng village, Cijeruk district. The technique of collecting sample is using the Purposive Random Sampling method from population of observation has a commercial field. The sample is from three fields and each field is taken 30 sample trees and each tree is taken 2 hermaphrodite papayas. There are found some similarities and differences of morphology and quality of papaya IPB 9 that’s planted at three locations. The result of research showed that genotype IPB 9 was planted having same characters, except number leaf, petiole diameter, leaf length, leaf wide, length of veins of a leaf , steam circumference, length of fruit stalk , number of fruit. On the physical fruit quality, were significantly different for diameter lower end and middle of fruit, weight of fruit, hardness lower end of skin fruit, middle fruit flesh, tip fruit flesh, thickness of fruit flesh, weight of 100 seeds, weight of fruit flesh. On the chemical fruit quality, were significantly different for acidity titrrable. Whereas on hardness of skin fruit tip, middle of fruit flesh, vitamin C content, and water content on theree location not significantly differents
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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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