Judul: Analisis Dampak Perubahan Tutupan Lahan Daerah Aliran Sungai Citanduy Hulu
Abstrak: Aktivitas Manusia Dan Kepadatan Penduduk Yang Meningkat Dapat Menimbulkan Beberapa Masalah Yang Menyebabkan Perubahan Penggunaan Lahan Di Das Citanduy. Pada Penelitian Ini Bertujuan Untuk Mengidentifikasi Perubahan Lahan Das Citanduy Pada Tahun 2008-2013 Dan Menduga Perubahan Besar Aliran Permukaan Sebagai Dampak Perubahan Tutupan Lahan Di Das Citanduy. Hasil Analisis Menunjukkan Bahwa Tutupan Lahan Pada Wilayah Kajian Das Citanduy Hulu Tahun 2008-2013 Telah Terjadi Perubahan. Perubahan Tersebut Yaitu Peningkatan Hutan Tanaman Sebesar 3% Dan Penurunan Pertanian Lahan Kering Campuran Sebesar 2% Dari Luas Total 1730.94 Km2. Selain Itu, Menurunkan Nilai Cn Das Dari 77 Menjadi 76. Pendugaan Aliran Permukaan Dengan Menggunakan Metode Scs-Cn Pada Wilayah Das Citanduy Didapat Hasil Yang Overestimate. Pada Tahun 2008 Dengan Curah Hujan Sebesar 2322 Mm Menghasilkan Aliran Permukaan Sebesar 267 Mm Pada Model Scs-Cn Sedangkan Hasil Observasi Sebesar 224 Mm. Pada Tahun 2013 Dengan Curah Hujan Sebesar 3792 Mm Menghasilkan Aliran Permukaan Sebesar 618 Mm Pada Model Scs-Cn Sedangkan Hasil Observasi Sebesar 263 Mm. Terjadi Peningkatan Aliran Permukaan Sebesar 5% Dari Tahun 2008-2013 Akibat Dari Peningkatan Curah Hujan Tahunan Sebesar 63% Dari Curah Hujan Tahun 2008.
Keyword: Aliran Permukaan, Metode Scs-Cn, Perubahan Penutupan Lahan

Judul: Kajian Perubahan Tutupan Lahan Sub DAS Citanduy Hulu terhadap Kualitas Air Sungai Citanduy Hulu
Abstrak: Along with the growth of population, the need of areas for residential is also increasing which interfere the existence of forest along the river upstream areas. Land use changes which occured on the watershed indicates the decrease of water quality for example in Citanduy Hulu subwatershed. The aim of this research is to assess the changing of land cover, water quality and the relation between both aspects. Analysis which was used in this research are changes of land cover, and Index of Water Quality-National Sanitation Foundation (IKA-NSF) calculation. Land cover type in Citanduy Hulu subwatershed which decreased are forest (33.27%), bushes (45.25%), and waterbody (47.59%). Land cover type which increased are residential (107.88%), paddyfield (98.52%), dryland farming (26.97%), and open space (74.02%). The water quality of Citanduy Hulu river is categorized as good. The value of IKA on Citanduy Hulu river showed the tendency to decline from 73.16 in 2003 to 70.42 in 2011. The decrease of forest, bushes, and waterbody also the increase of residential, paddyfield, dryland farming and open space at Citanduy Hulu subwatershed caused the decrease of water quality at Citanduy Hulu river.
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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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