Judul: Public opinion on Suralaya Steam Power Plant
Abstrak: Coal has commonly been used as one of the energy sources to generate electricity in steam power plants in Indonesia for the reason that it is much more economical than other energy sources. However, it brings about negative impacts on the environment and health. This research aims at (1) analyzing public opinion on Suralaya Steam Power Plant, (2) analyzing correlation between newspaper, public relations, opinion leader and experience to shape public opinion. The research was conducted in the area around Suralaya Power Plant in January until March 2010. Using the community in the area as the research population, the research used cluster random sampling to obtain 343 respondents as the sample. Data was collected by using observation, questionnaire, interview FGD, and documentation study. The research used descriptive correlational method. Public opinion grouped based on the villages, types of occupation, and sexes was analyzed by using chi-square, while the correlation between newspaper, public relations, opinion leader, experience and public opinion was analyzed by using gamma correlation. The result showed that male respondents in Suralaya Village working as merchants and employees generally felt that their economy had become better. Respondents in Suralaya Village and Salira Village who were mostly female employees stated that their village had become more lively. Health problems were only felt by female employees living in Suralaya Village. Both male and female respondents working as fishermen in Suralaya Village were disturbed by the noise from the power plant. Nevertheless, only male respondents working as merchants in Suralaya Village who generally stated that the coal ash could poison the fish at sea and the female respondents confirmed that it could damage their farm. Moreover, female employees in Suralaya Village claimed that the coal ash could also spoil goods. The public opinion was related to opinion leader and experience; nonetheless, newspaper and public relations had no correlation with public opinion.
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Judul: Pollutant Level of Natural Radionuclides 238U and 232Th in Waters Surrounding the Area of the Coal Fired Power Plant (Case Study Waters of Pulau Panjang and Coastal of Lada Bay, Banten).
Abstrak: This study had been carried out by collecting sample of the surficial sediments, sea water, seaweeds, fishs (Stolephorus) and mussels (Codakia) from 4 locations in waters of Pulau Panjang and coastal of Lada Bay (as control/comparison site), Banten in June-July 2010. Natural radionuclide (238U and 232Th) concentrations in samples were measured using neutron activation analysis (NAA) method. The results showed that total radionuclide concentrations in sediment (238U: 18,6160– 35,0013 Bq/kg; 232Th: 11,2020-35,6685 Bq/kg), seawater (238U: undetected; 232Th: 0,0790-0,1299 Bq/l), cultivation seaweeds (238U: undetected; 232Th: 3,6735- 4,8345 Bq/kg), natural seaweeds (238U: 3,6851-48,0430 Bq/kg; 232Th: 3,9941- 9,0788 Bq/kg), Stolephorus (238U: undetected; 232Th: 3,3078 Bq/kg) and Codakia (238U: 6,8903 Bq/kg; 232Th: 3,6023 Bq/kg) in Pulau Panjang, Banten around Suralaya coal fired power plant (PLTU) higher than control site that were around the Labuan coal fired power plant, namely in sediments (238U: 10,4253 Bq/kg; 232Th: 16,5952 Bq/kg), seawater (238U: undetected; 232Th: 0,0671 Bq/l), cultivation seaweeds (238U: undetected; 232Th: 2,3005 Bq/kg), natural seaweeds (238U:19,5367 Bq/kg; 232Th: 2,6729 Bq/kg) and Stolephorus (238U: undetected; 232Th: 2,0603 Bq/kg). This means the coal fired power plant has an impact on natural radionuclides pollution in the waters. The internal radiation exposured (via consumed of Codakia and Stolephorus) that received by inhabitant who live in Kampung Peres, Pulau Panjang, Banten are between range 0,00047-0,01984 mSv/year. This value was considered less than limitation of effective doses that recomended by IAEA for public (1 mSv/year).
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Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix