Judul: The Impact Of Water Quality In Healthy Risk Donan River, Cilacap-Central Java
Abstrak: Industrial waste waters will reduce the quality of water since some industry use the river as a waste disposal site and transport the waste into sea waters. Donan estuary has evolved into a new growth center because this area has been used as an industrial hub, the port area, transport and fisheries. Waste waters from natural or anthropogenic activities around Donan river is suggested as the pollution trigger. Large industrial waste producers located in the Donan waters are the oil and gas industry, fertilizer bagging unit, cement mills, workshops shipping, oil mills, industrial refined sugar. Waste generated from these activities has been discharged into the river before transporting into the sea in the form of solid waste, wastewater, and gas. This raises a strong presumption that Donan has been polluted. The purpose of this study are (1) Determine the water quality and heavy metal concentrations of Pb and Cd in water, sediment and P. Erosa in Donan waters (2) Know the status of pollution, pollution load, and the assimilation capacity of Donan waters, (3) Perform a risk analysis of the effects of Pb and Cd pollution on health and risk management of Donan waters pollution control. Research is done by field surveys, direct examination of samples in the field and laboratory, and interviews with parties related to the Donan waters. Observations were made at six stations before industrial activity which head to the estuary area of Segara Anakan. Research was conducted eksitu and insitu by comparing the quality standard based on Government Regulation No. 82 of 2001. The amount of pollutant loads, pollutant index, health risks were determined using the established approaches. The result indicates that the quality of Donan river based on pollution index method medium polluted on station 2,4,6 and mild polluted at the station 1,3,5. The average of tested parameters exceeded the quality standards stipulated by Government Regulation No. 82 of 2001 on water quality class II. Pollution load is calculated based on the parameters of TSS, BOD, COD, Pb, and Cd both in the high tide and low tide conditions, the average COD value of the highest pollutant load per day is 225 tons/day and TSS is 92 tons / day.the pollutant load which entering into the Donan river exceeded its assimilation capacity for the tested parameter. Pb and Cd in the contained intake in water, sediment and selfish in study area were in the level of risk > 1 that means very high risk for human health. It is shown that the level of risk in water, sediment, and selfish is great therefore it is needed to reduce the contact time by reducing the daily or annual exposure time.
Keyword: pollutant load, assimilation capacity, P.erosa, risk health, sediment

Judul: Kajian Beban Pencemaran dan Kualitas Air Sungai Batang Arau di Kota Padang
Abstrak: Development activities in the area of the watershed of a Batang Arau were very intensively with the increase of population that high as the impact of high dynamic of development in the town of the field. Padang has the development of population growth rate 1,09 % according to data from the central bureau of statistics Padang City in 2010. It is in line with the course of economic Padang City. Economic activities of micro agriculture, industry (industry small to large industries) or mining was the backbone of the economy padang. However, with increasing population, development and the economy in padang thought to have an undesired effect negative into the environment are increasing the loads of pollution in the watershed of a Batang Arau in particular the Batang Arau River. The accumulation of the burden of contaminant on the upstream to downstream will make the level of pollution Batang Arau River more tainted. The purpose of this research is a) identify sources contaminant the waters of the Batang arau River at Padang City, b) evaluate developments water quality of the Batang Arau River from upstream to downstream during the period 2008-2012 and c) knowing pollution load any sources contaminant and a capacity of the burden of pollution Batang Arau River. The technique of adoption of the data used in this research is by means of observations, inventorying sources of pollution on the Batang Arau River and an interview with the methods purpossive of sampling. In addition, was also performed by collecting data secondary through the study of literature and examine documents. The condition of the quality of the water of the Batang Arau River analysis based on government regulation of the republic of Indonesia number 82 in 2001. The status of the quality of the water of the uses index the quality of water national sanitation foundation (IKA-NSF). Calculation the pollution loads from various sources contaminant carried out through the approach of rapid assessment of sources of water, polution, water and land while calculation capacity of the burden of pollution according to the decision of the state minister of environment No.110 in 2003. Contaminant sources in Batang Arau River at Padang city is waste from domestic/household, industry, agriculture and mining. Water quality of Batang Arau Rivers was decresing from upstream to downstream. The development of the water quality of Batang Arau River showed that on the upper and middle of the River, the river water quality meets quality raw rods or class II PP 82/2001, while in the downstream river water quality meets quality raw rods or class IV PP 82/2001. Based on the water quality index value, The Batang Or Padang city in 2008-2012 in moderate to good conditions that are in the range of 53-72 in the rainy season and 56-74 during the dry season. The burden of the most heavily contributed to pollution into the Batang Arau River is industrial waste (tons/month 152.905, 9 of BOD, 139.456, 3 ton/month of COD, 124.858 ton/month of TSS and 10.885.106 ton/month of TDS) followed by mining wastes (0 ton/month of BOD, 316.480 ton/month
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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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