Judul: Analisis limpasan permukaan pada berbagai umur kebun kopi di Sumberjaya, Lampung Barat
Abstrak: Konversi hutan menjadi lahan perkebunan di daerah Sumberjaya, Lampung Barat meningkat jumlahnya pada beberapa tahun terakhir ini. Sebagian besar hutan yang merupakan bagian dari hutan lindung dibuka dan kemudian dijadikan lahan perkebunan. Perkebunan di daerah ini didominasi oleh tanaman kopi. Peningkatan umur kebun/ tanaman kopi akan mempengaruhi besarnya limpasan permukaan. Penurunan limpasan pennukaan akan terjadi dengan bertambahnya umur kebunltanaman kopi akan berakibat pada kejadian erosi lahan. Kondisi kebun kopi monokultur 1, 3, 7 dan IO tahun dijadikan fokus utama pada penelitian ini . Selain itu dipilih plot hutan sebagai kondisi kontrol dan pembanding terjadinya perubahan limpasan pennukaan. Model WaNuLCAS (Water, Nutrient and Light Captllre in Agroforestry System) dapat digunakan untuk mensintesis proses - proses penyerapan air, hara dan cahaya pada sistem agroforestri. WaNuLCAS disusun untuk dapat mensimulasikan berbagai sistem agroforestri pada berbagai kondisi lahan dan iklim. Penggunaan model ini diharapkan dapat digunakan untuk mengetahui dan menduga perubahan limpasan pennukaan yang terjadi dengan beragamnya kondisi lahan.
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Judul: Rate of soil loss md soil quality on caffee-based farming system at Sumberjaya, West Lampung.
Abstrak: Coffee-based farming has benn perceived by policy makers as causing a high erosion rate and as a source of sedimentation. Past approach to control erosion and restore forest function has been on eviction of the farmers from the forest jurisdiction area and forceful replacement of coffee plants with timber or leguminous tree species such as kaliandra (Calliandra calothirsus).Thih was done because of the myths that forest function restoration can only be done by reforestation by forestry trees. The objectives of this study were to evaluate: (1) The rate of erosion on steep slope coffee-farm with different soil conservation measures, (2) the dominant factors that effect the rate of erosion, (3) impact of forest canversion to coffee farm based on soil quality changes. Three experiments were conducted at Sumberjaya Sub-District, West Lampung District from November 200l -July 2003. Experiment I was aimed at quantifying the level of soil loss on 3 year old coffee farm with slopes ranging from 50 to 60% at Dusun Laksana and Tepus.
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Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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