Judul: Analisis Pendapatan Usahatani Padi dengan Pemanfaatan Limbah Ternak Sapi Potong (Studi Kasus: Desa Sukajadi, Kecamatan Cariu, Kabupaten Bogor)
Abstrak: The majority of Indonesian people is still being a farmer for their livelihood. This research objective were to identify performance of paddy farming with waste animal husbandry utilization, to analyze cost structure and income efficiency of paddy farming, and to analyze factors that influenced farmers to do paddy farming with waste animal husbandry utilization. Paddy farming performance of this research seen by time of plant, land preparation, seedbed, planting treatment, labor utilization, and agriculture waste production with descriptive analysis method. Cost structure and income efficiency were analyzed by using percentage of the total cost and R / C ratio method while factors that influence farmers' decisions was analyzed by using logistic regression. This research conducted at Sukajadi Village and respondents of this research were 30 farmers who utilize waste and 30 farmers who do not use waste. Based on research result showed that the performance of rice paddy farming which used waste utilization was still using a simple technical cultivation. Farmers who utilize waste made savings of fertilizer costs of 4.30%. So, the farmers who utilize waste made savings of cost production by 6.78%. Difference of income based on cash of cost production who accepted by farmers used utilize waste are Rp 435 826 /ha/season. Difference of income based on totally cost production who accepted by farmers used utilize waste are Rp 284 069/ha/season. Value of R/C ratio based on cash of cost production and totally cost production indicate that paddy farming with and without waste animal husbandry utilization were worth it and gave advantage for farmers. Factors that influenced farmers decision to do paddy farming with waste animal husbandry utilization were influenced by paddy farming income, the cost of chemical fertilizer for one growing season, burden of farmer, and education of farmers.
Keyword: waste animal husbandry, paddy farming, income analysis

Judul: Analisis pendapatan petani Padi sawah di Desa Ciasihan Kecamatan Pamijahan Kabupaten Bogor
Abstrak: Rice production in Indonesia is getting decreased due to the presence of land conversion to non-agricultural sector. One area of West Java that having decline of crop land area is Bogor District. Production decrease of 7.54% from 2010 is caused by the reduced of crop land area that reaches 6 183 ha from 2010 to 2011. Increasing rice productivity isn’t always able to increase the amount of milled rice production if it is followed by a decrease in crop land area. The objectives of this research are to identify performance of rice farmers and analyze the income of rice farming in the Ciasihan Village. The research results indicate that rice farming is still viable seen from the amount of income, is Rp 5.545.169/season. The value of the ratio R / C of rice farming in the ciasihan village is 1.33. Therefore, to increase the income of farmers, the government can provide training and counseling, supporting equipment,and facilities for meetings.
Keyword: Bogor Agricultural University (IPB), Rice, R/C ratio, Cost, Revenue

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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