Judul: Kontribusi pendapatan keluarga dari pemanfaatan limbah pertanian di desa sukajadi, kecamatan tamansari, kabupaten Bogor
Abstrak: Limbah pertanian yang dianggap sebagai sumberdaya yang kurang bernilai apabila dikelola secara bijaksana dapat dimanfaatkan sebagai sumberdaya yang bernilai ekonomis. Tujuan umum dari penelitian ini adalah mempelajari limbah pertanian dan pemanfaatannya. Tujuan khususnya adalah: (1) mempelajari jenis, manfaat, jumlah, dan pemanfaatan limbah pertanian, (2) mempelajari nilai tambah pemanfaatan limbah pertanian terhadap produksi dan pendapatan bersih usaha tani Penelitian ini merupakan studi lanjutan bagian dari penelitian payung bertema "Bioresources Management System to Support Household Food Securitya Longitudinal Study Among Rural Households in Java "Penelitian dilakukan di Desa Sukajadi, Kecamatan Tamansari. Desain penelitian yang digunakan adalah Cross Sectional Study. Penelitian dilaksanakan dari bulan Juli sampai Oktober 2001. Sebanyak 30 contoh yang mengusahakan lahan usaha tani dipilih secara purposive dari setiap strata kepemilikan lahan. Data primer yang dikumpulkan adalah identitas anggota rumah tangga; pendapatan keluarga; luas dan jenis lahan usaha tani; pihak pengambil keputusan terhadap pemanfaatan limbah pertanian; jenis, jumlah, manfaat dan nilai ekonomi limbah pertanian yang dihasilkan. Sedangkan data sekunder yang dikumpulkan adalah keadaan umum daerah penelitian. Data primer diperoleh melalui wawancara dengan menggunakan kuesioner. Data pemanfaatan limbah pertanian selain diperoleh melalui wawancara juga diperoleh melalui pengamatan langsung di lapangan. ...
Keyword: agricultural-waste utilization, agricultural waste, Duncan's test

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: 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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