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: Distribution of Several Heavy Metals in Water and Sediment at Bojonegara Foreshore, Banten Bay
Abstrak: Penelitian ini bertujuan memetakan pola sebaran beberapa logam berat di air dan sedimen berdasarkan variabilitas musim dan potensi sumber serta menduga tingkat kualitas perairan di Perairan Bojonegara, Teluk Banten. Penelitian ini dilaksanakan selama tiga bulan pada bulan Agustus-Oktober 2020 di enam titik stasiun pengamatan dari daerah sungai ke laut. Analisis logam berat mengikuti prosedur APHA 2012. Analisis data yang dilakukan terdiri dari sebaran kandungan logam berat dan hubungan parameter kualitas air dengan logam berat. Konsentrasi logam terlarut umumnya masih rendah (tidak terdeteksi) terutama Hg, Cd, dan Pb di semua stasiun pengamatan, sedangkan logam jenis Cu ditemukan di seluruh stasiun dengan kisaran konsentrasi <0.0002-0.0075 mg/L. Konsentrasi logam Cu, Cd, dan Pb dalam sedimen terdeteksi di beberapa lokasi pengamatan dengan kisaran konsentrasi <0.02-3.90 mg/kg Cu, <0.02-1.68 mg/kg Cd, dan <0.02-0.6.71 mg/kg Pb. Di antara konsentrasi tersebut, pada beberapa lokasi Cd terindikasi melebihi baku mutu untuk kehidupan organisme. Berdasarkan hasil analisis korelasi, konsentrasi logam berat pada suatu perairan dapat dipengaruhi oleh TSS, kekeruhan, salinitas serta oseanografi perairan. Kata kunci: konsentrasi, sebaran logam berat, Teluk Banten, The aims of this research were to map the seasonal variability of the distribution pattern of several heavy metals in water and sediment based on heavy metals concentrations and potential sources and to estimate the level of water quality at Bojonegara Foreshore, Banten Bay. The research was conducted for three months in August-October 2020 at six stations from the river area to the sea. Analysis of heavy metals followed the APHA 2012 procedures. Data analysis consisted of the distribution of heavy metals and correlation of water quality parameters to heavy metals. The concentration of dissolved metals in generally still low (undetectable), especially Hg, Cd, and Pb at all observation stations, while the type of Cu metal was found at all stations with a concentrations range of <0.0002-0.0075 mg/L. Cu, Cd, and Pb concentrasions in sediments were detected at several observation locations with a concentration range <0.02-3.90 mg/kg Cd, <0.02-1.68 mg/kg Cd, <0.02-6.71 mg/kg Pb. Among these concentrations, at several locations, Cd were indicated to exceed the quality standard for organism life. The concentration of heavy metal is influenced by TSS, turbidity, salinity, and water oceanography phenomenon. Keywords: concentration, distribution of heavy metals, Banten Bay
Keyword: concentration, distribution of heavy metals, Banten Bay

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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