Judul: Dalam upaya pelestarian dan peningkatan fungsi situ
Abstrak: Salah satu lahan basah yang potensial sebagai sumber dan tempat penarnpungan air adalah situ atau danau, yang terbentuk secara alami atau buatan. Situ alami membutuhkan penanganan yang lebih intensif agar fungsi dan potensinya dapat terus dipertahankan. Penelitian ini n~engkajis ecara khusus kondisi ekologi perairan alami Situ Citayam. Kajian ekologi yang dilakukan mencakup pengamatan kondisi mum perairan dan uji kualitas air secara fisika, kimia, dan biologi. Analisis data untuk uji biologi digunakan perhitungan kelimpahan plankton dan indeks keragaman Shannon Wiener (H'). Rasio nitrogen dm fosfor dihitung untuk mengetahui faktor pembatas utama kehidupan biota akuafik, sedangkan analisis regresi linier berganda digunakan untuk mengetahui keterkaitan antara parameter fisika, kimia, dan biologi. Analisis kwilitas air secara fisika dan kirnia menunjukkan kondisi perairan yang tercemar sedang akibat buangan limbah cair domes* penumpukan sampah padat, dan erosi tanah yang menimbulkan pendangkalan. Indikator tingkat pencemaran sedang dari Situ Citayam diduga dari ditemukannya organisme a mesosaprobik pencixi perairan tercemar sedang, antan lain Brachionus, Oscillatoria, Melosira, Scenedesmus, Pediastrum, Vorticella, dan Spirog~aH. al ini didukung oleh nilai keraganan Shannon Wiener yang kisarannya antara 1,12-1,30. Perhitungan rasio nitrogen dan fosfor menunjukkan faktor penlbatas utama kehidupan biota akuatik Situ Citayam adalah unsur fosfor. Hasil analisis regresi linier berganda menunjukkan keterkaitan yang erat antara parameter fisika, kimia, dan biologi.
Keyword: 

Judul: Kajian Ekologi Situ Citayam, Depok Jawa Barat dalam Upaya Pelestarian dan Peningkatan Fungsi Situ
Abstrak: Situ or lake is one of tl~ep otential wetland that could be developed by natural or man made.Natunl situ need more intensive treatment, in order tlle function and the potency of situ will not lost.This research is done by studying the ecological condition of Situ Citayam freshwater. The study focused on the general condition of freshwater. Water quality analyzed by physical, chemical, and biological parameter. The abundance and, diversity of plankton were analyzed by Shannon Wiener diversity index (H'). Nitrogen and phospoms ratio was counted to get the main limited factor of water organism growth, and double linier regression analysis to know the relation of physical, chemical, and biological parameter. Physical and chemical of water quality showed tllat the condition of freshwater has been polluted in middle range. It caused by domestically waste water and soil erotion which causing superficial in some region. The indicator of the middle polluted level Situ Citayam is guessed from the mesosaprobic organism which found out, it consists of Brachionus, Oscillatoria, ~Melosira. Scenedesn~ us, Pediastrunr, Vorticella, and Spirogym. All the matters supported by index diversity of Shannon Wier in range between 1,12 to 1,30. Nitrogen and pl~osporus ratio counted show that the main limited factor of water organism growth in the situ was phosporus. The result of double linier regression analysis described a very close relation between the physical. chemical, and the biological parameter as well.
Keyword: 

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
Keyword: