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.
Keyword: 

Judul: Estimation of Community Economic Losses Due to Pollutants from the Indramayu Coal PLTU ( Case Study: Karang Layung Village, Sukra District, Indramayu Regency, West Java Province)
Abstrak: PLTU Batubara Indramayu merupakan salah satu pembangkit listrik yang terletak di Provinsi Jawa Barat memiliki kapasitas 3x330 Megawatt (MW) dan beroperasi sejak tahun 2011. PLTU merupakan kegiatan produksi yang menghasilkan listrik dengan menggunakan batubara sebagai energi utamanya. Suatu aktivitas produksi atau konsumsi tidak terlepas dari eksternalitas bagi lingkungan sekitar. Penelitian ini bertujuan untuk (1) Mengidentifikasi eksternalitas positif dan negatif yang dirasakan masyarakat akibat PLTU Indramayu menggunakan analisis deskriptif kualitatif. (2) Mengestimasi kerugian ekonomi yang ditanggung masyarakat akibat aktivitas PLTU Indramayu menggunakan metode cost of illness dan loss of earning. (3) Mengestimasi besarnya nilai kompensasi yang bersedia diterima masyarakat menggunakan Contingent Valuation Method (CVM). (4) Menganalisis faktor-faktor yang memengaruhi besarnya kompensasi menggunakan analisis regresi logistik ordinal. Eksternalitas positif yang dirasakan dapat dilihat dari aspek ekonomi, sosial, dan budaya. Eksternalitas negatif yang dirasakan meliputi penurunan kualitas udara, kualitas air, kebisingan, terganggunya kenyamanan, dan kerugian yang dialami. Biaya berobat yang dikeluarkan masyarakat sebesar Rp 570.010.000/tahun dan kehilangan pendapatan yang dialami masyarakat sebesar Rp 274.493.214/tahun. Nilai dugaan rata-rata Willingness to Accept (WTA) responden sebesar Rp 552.000/KK/tahun. Faktor-faktor yang memengaruhi nilai WTA responden adalah jarak tempat tinggal, total kerugian, eksternalitas positif, dan jenis kelamin., Indramayu Coal Electric Steam Power Plant (PLTU) is one of the power plants located in West Java Province with a capacity of 3x330 Megawatts (MW) and has been operating since 2011. This study aims to (1) identify positive and negative externalities due to PLTU Indramayu activities perceived by the community using qualitative descriptive analysis. (2) estimate the economic losses borne by the community due to PLTU Indramayu activities using the cost of illness and loss of earnings methods. (3) estimate the amount of compensation that the community is willing to accept using the Contingent Valuation Method (CVM). (4) analyze factors that influence the amount of compensation using ordinal logistic regression analysis. The perceived positive externalities can be seen from the economic, social, and cultural aspects. The perceived negative externalities include a decrease in air quality, water quality, noise, disturbance of comfort, and losses experienced. The cost of illness and loss of earnings borne by the community are Rp 570.010.000/year and Rp 274.493.214/year, respectively. The estimated average value of respondents’ Willingness to Accept (WTA) is Rp 552.000/household/year. The factors that influence the respondents’ WTA scores are distance from residence, total loss, positive externalities, and gender.
Keyword: Compensation, electricity, environmental quality, externalities

Judul: Invers dari Matriks Tridiagonal Jacobi
Abstrak: Suatu matriks berukuran n×n dinamakan matriks tridiagonal jika untuk . Karya ilmiah ini memberikan algoritma yang mudah untuk menemukan invers ( dari matriks tridiagonal Jacobi yang simetrik dan nonsimetrik. Setiap elemen pada matriks tridiagonal ini adalah bilangan real. Terdapat 3 lema dan 2 teorema untuk menentukan . Lema pertama menunjukkan persamaan utama dalam membuktikan lema-lema dan teorema-teorema selanjutnya. Invers dari matriks yang simetrik dibuktikan oleh lema kedua yang menunjukkan elemen-elemen baris ke- dari . Selanjutnya, lema kedua dilengkapi dengan teorema pertama yang menunjukkan elemen-elemen dengan . Invers dari matriks yang nonsimetrik dibuktikan oleh lema ketiga yang menunjukkan elemen-elemen dengan dan elemen-elemen dengan dibuktikankan oleh teorema kedua.
Keyword: symmetric, nonsymmetric, matrix