Judul: Vulnerability of Salt Farming in Bungko Lor Village Cirebon Regency
Abstrak: Menurut Kementerian Kelautan Perikanan RI, Desa Bungko Lor merupakan lokasi prioritas pengembangan Sentra Ekonomi Garam Rakyat di Kabupaten Cirebon. Terdapat perbedaan metode yang digunakan oleh petani garam rakyat dalam memproduksi garam di Desa Bungko Lor yang sama-sama memiliki kerentanan terhadap variabilitas cuaca. Tujuan dari penelitian ini adalah mengidentifikasi faktor-faktor yang memengaruhi petani dalam memilih metode yang digunakan, mengestimasi pendapatan petani garam tradisional dan petani garam geomembran, dan menganalisis kerentanan usahatani garam rakyat di Desa Bungko Lor. Metode yang digunakan dalam penelitian ini yaitu Livelihood Vulnerability Index (LVI). Hasil penelitian menunjukkan bahwa faktor-faktor yang memengaruhi keputusan petani dalam memilih metode bertani yaitu pernah mengikuti sosialisasi, lama bertani, pernah mendapat bantuan, dan harga garam di tingkat petani. Rata-rata pendapatan petani garam tradisional sebesar Rp 20.242.353/tahun dan petani geomembran sebesar Rp 24.196.874/tahun. Hasil tingkat kerentanan usahatani terhadap variabilitas cuaca memperlihatkan bahwa petani dengan kedua metode secara keseluruhan memiliki nilai kerentanan berskala tingkat menengah., According to the Indonesian Ministry of Maritime Affairs and Fisheries, Bungko Lor Village is a priority location for developing the People's Salt Economic Center in Cirebon Regency. There are different methods used by smallholder salt farmers in producing salt in Bungko Lor Village, both of which are vulnerable to weather variability. The aim of this research is to identify factors that influence farmers in choosing the methods used, estimate the income of traditional salt farmers and geomembrane salt farmers, and analyze the vulnerability of salt farming in Bungko Lor Village. The methods used in this research is the Livelihood Vulnerability Index (LVI). The results of the research show that the factors that influence farmers' decisions in choosing farming methods are having participated in socialization, years of farming, having received assistance, and the price of salt at the farmer level. The average income for traditional salt farmers is IDR 20.242.353/year and geomembrane farmers is IDR 24.196.874/year. The results of the level of vulnerability of farming to weather variability show that farmers using both methods overall have medium level vulnerability values.
Keyword: geomembrane, income analysis, logistic regression, odds ratio, vulnerability

Judul: Analisis Pendapatan Usaha Garam Rakyat Berdasarkan Status Lahan dan Penggunaan Zat Aditif (Studi Kasus: Desa Santing, Kecamatan Losarang, Kabupaten Indramayu)
Abstrak: Indonesia is a maritime country with a variety of marine and fishery resources of wealth. One that can be utilized is sea water as a raw material for producing salt. Although it has abundant marine wealth, Indonesia still remains a substantial importer of salt annually. Since 2006 – 2010, the Government of Indonesia imports amounted to 1.731.309 tons, 4, on average per year. Santing village is one of the largest salt manufacturer in Indramayu Regency, while Indramayu Regency is the largest salt producer in West Java. Therefore base on the potential of the area, Indramayu Regency is expected to optimize more the production of salt. Production propotionally compares to income, so the farmers have to increase the production of salt by optimizing the input that is used as a factor of production in order to improve their income. The additives substance named ramsol is used as additional inputs in producing salt by some farmers in the village of Santing and it is good to improve the quality and output of salt, from the results of interviews with 100 respondent, 62 respondents use additives as additional inputs to their salt production, and the rest, 38 respondents do not use additives. The factors that affect the production of salt are the number of windmills, land area, labor and additives. But in a season of 2011 salt farmers who use additives caan improve their salt production on average 85.053,76 kg per ha, while the farmers who do not use additives is only 71.903 .51 kg per ha. The analysis of people’s salt revenues is differed based on the status of the land and the use of additives. Status of land is divided into two categories, first the farmers’s production sharing land (penyakap) and the second is the farmers on the leased land. The highest income will be obtained by the farmers who use additives on their own land. The lowest income will be gained by the farmers whoo do not use additives and they produce on the production sharing land status.
Keyword: income, production, ramsol, additives, salt

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