Judul: Sebaran Logam Berat (Cd, Cu, Hg, Pb) pada Sedimen di Perairan Pesisir Kabupaten Tangerang
Abstrak: Pollution of coastal waters caused by Tangerang Regency industrial, domestic, and farmers. Dangerous pollution parameters such as metal cadmium (Cd), copper (Cu), mercury (Hg) and lead (Pb). The concentration of heavy metals in sediment suspended in the water will then settle and accumulate in sediment. This study was conducted in April and August 2013 in the coastal area of Tangerang, Banten. This sampling of water and sediment quality. Method of measurement of heavy metals is ICP and AAS. Analysis of heavy metals is descriptive and statistical. Spearman correlation test is to determine relationship between concentration of heavy metals with grain size particle and total organic carbon. Distribution of heavy metals in sediments varies spatially. The value of the metal content of Hg as a whole has exceeded the quality standard that Hg pollution. The Spearman correlation showed that their is no relationship between heavy metal content with grain size particle (dominated by silt) and total organic carbon showed (P> 0.05).
Keyword: Bogor Agricultural University (IPB), total organic carbon., sediment, grain size particle, Pb element, Hg, Cu, Cd

Judul: Sebaran Kandungan Logam Berat Terlarut (Hg, Pb, Cu,
Cd) di Perairan Pantai Karangantu, Teluk Banten.
Abstrak: Tekanan lingkungan akibat aktivitas antropogenik memicu paparan logam berat terlarut di perairan Pantai Karangantu, Teluk Banten. Penelitian ini bertujuan untuk menganalisis sebaran kandungan logam berat terlarut merkuri (Hg), timbal (Pb), tembaga (Cu), dan kadmium (Cd) pada perairan Pantai Karangantu, Teluk Banten. Metode yang digunakan dalam penelitian ini terdiri dari analisis kualitas air secara in situ dan ex situ, seperti konsentrasi logam berat terlarut, suhu, kecerahan, salinitas, pH, DO, kekeruhan, dan TSS. Analisis data yang dilakukan terdiri dari sebaran logam berat terlarut dan penentuan status pencemaran berdasarkan Indeks Pencemaran (IP). Pola sebaran logam berat terlarut dipengaruhi besar oleh fenomena pasang surut. Konsentrasi logam berat terlarut semakin meningkat dan mengarah ke laut sesuai dengan ketinggian gelombang pasang surut pada setiap bulan pengamatan. Konsentrasi Hg terlarut di perairan laut Pantai Karangantu telah melebihi baku mutu air laut bagi biota. Hasil perhitungan Indeks Pencemaran menunjukkan bahwa perairan Pantai Karangantu tergolong tercemar ringan., Environmental pressure due to anthropogenic activities were suspected of increasing the dissolved heavy metals in the waters of Karangantu Beach, Banten Bay. This research aims to analyze the distribution of dissolved heavy metals mercury (Hg), lead (Pb), copper (Cu), and cadmium (Cd) in the waters of Karangantu Beach, Banten Bay. The method used in this study consists of in situ and ex situ analysis of water quality, such as dissolved heavy metal concentrations, temperature, brightness, salinity, pH, and DO, turbidity, and TSS. The data analysis consisted of dissolved heavy metal distribution and pollution status determination based on the Pollution Index (PI). The distribution pattern of dissolved heavy metals is greatly influenced by tidal phenomena. The concentration of dissolved heavy metals increased and headed to the sea according to the height of the tidal wave in each month of observation. The concentration of dissolved Hg in the marine waters of Karangantu Beach has exceeded the quality standards of seawater for biota. The results of the Pollution Index calculation showed that Karangantu Beach waters are classified as lightly polluted.
Keyword: kualitas air, pencemaran air, logam berat terlarut, sebaran logam berat terlarut, sebaran logam berat, distribution of heavy metal, water pollution, water quality, dissolved heavy metal, Pantai Karangantu, Karangantu Beach

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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