Judul: Identification of the Condition of Cisarua River Ciliwung Hulu Sub-Watershed
Abstrak: Sungai Cisarua merupakan salah satu sungai yang ada di Hulu DAS Ciliwung yang mengalami perubahan penggunaan lahan cukup masif. permasalahan tersebut mendorong untuk melakukan pencarian informasi terkait kondisi sungai sebagai dasar menentukan rencana pengelolaan di masa yang akan datang. Penelitian ini bertujuan untuk mengidentifikasi kondisi Sungai Cisarua Sub DAS Ciliwung Hulu. Metode yang digunakan yaitu susur sungai dengan mengambil data spasial dan visual, sementara untuk data non spasial diambil dengan cara wawancara. Keseluruhan data dianalisis dengan deskriptif kualitatif. Hasil penelitian menunjukan bahwa Sungai Cisarua masih cenderung dalam keadaan baik. Hal tersebut digambarkan dengan kondisi umum Sungai Cisarua masih memiliki tutupan lahan non pemukiman yang memadai. Selain itu masyarakat yang tinggal dan mengelola sungai sudah memiliki tingkat pengetahuan yang cukup tinggi sehingga tidak merugikan lingkungan sungai. Adapun perilaku masyarakat cenderung sesyau dengan pengetahuan yang mereka miliki sehingga tidak banyak perilaku yang dapat merusak sungai. Akan tetapi lembaga yang melakukan pengelolaan Sungai Cisarua masih belum terorganisir dengan baik sehingga informasi terkait sungai sulit untuk didapatkan sehingga pengelolaan sungai terkesan buruk., The Cisarua River is one of the rivers in the Upper Ciliwung watershed which has experienced massive land use changes. These problems prompted the search for information related to river conditions as a basis for determining future management plans. This study aims to identify the condition of the Cisarua River, Ciliwung Hulu Watershed District. The method used is along the river by taking spatial and visual data, while non-spatial data is taken by interview. The overall data were analyzed by qualitative descriptive. The results showed that the Cisarua River still tends to be in good condition. This is illustrated by the general condition of the Cisarua River that still has adequate non-residential land cover. In addition, the people who live and manage the river already have a fairly high level of knowledge so that it does not harm the river environment. The behavior of the community tends to be in accordance with the knowledge they have so that there are not many behaviors that can damage the river. However, the institution that manages the Cisarua River is still not well organized so that information related to the river is difficult to obtain so that river management seems bad.
Keyword: Identification, Management, Knowledge, Behavior, Cisarua River

Judul: Analisis posisi dan peran lembaga serta pengembangan kelembagaan di Daerah Aliran Sungai (DAS) Ciliwung, Position analysis of Ciliwung watershed along with its institution role and institutional development
Abstrak: Daerah Aliran Sungai Ciliwung merupakan DAS prioritas yang memiliki nilai hidrologis, ekonomis dan sosial yang sangat penting bagi kelangsungan kehidupan masyarakat. Kondisi DAS Ciliwung saat ini masihburuk yang tercermin dari laju erosi dan sedimentasi yang tinggi dan fluktuasi debit antara musim hujan dan kemarau yang tinggi. Selain itu kerusakan DAS Ciliwung dicirikan pula oleh penurunan kualitas air sungai, pengurangan penutupan vegetasi, dan rendahnya pendapatan masyarakat. Untuk mengatasi masalah tersebut pemerintah telah melaksanakan berbagai program dan kegiatan yang terkait dengan pengelolaan DAS. Namun sampai saat ini kinerja pengelolaan DAS Ciliwung masih tergolong rendah., Ciliwung watershed is categorized to be a priority watershed in Indonesia due to its hydrologic, economic, and social importance for people lifelihood. The watershed condition so far is in critical stage indicated by high rate of soil erosion and sedimentation and fluctuated discharge between two seasons, rainy to dry season. These problems are characterized by decresing water quality, dwinlling the extent of vegetation cover, and low income of local community.
Keyword: Sistem hidrologi, Interpretation Structural Modeling, Analytic Hierarchy Process, Pola penggunaan lahan

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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