Judul: Model pengelolaan lahan rawa lebak berbasis sumberdaya lokal untuk pengembangan  Usahatani berkelanjutan  (studi kasus di Kecamatan Sungai Raya dan  Sungai Ambawang, Kabupaten Kubu Raya - Kalimantan Barat)
Abstrak: The exploitation of swamp land is still limited when compared to the cultivation of dry land or irrigated land. Some of the factors that make the exploitation of swamp area far from expectation and its yields not maximum, for example 1) the wrong perception of farmers that the farming they are doing now has given high income, 2) a lack of capital, 3) low technological access, 4) characteristics of farmer‘s subsistence, and 5) tradition-based farming. This study was aimed to formulate a resources-based swamp land development model to increase land productivity and farmer Income. This research was conducted in the Sub-District of Sungai Ambangah in the District of Sungai Raya, and the Sub-District of Pasak Piang in the District of Sungai Ambawang, in the Regency of Kubu Raya, West Kalimantan Province. The analysis of each crop cultivated in both Sungai Ambangah and Pasak Piang gave the following results respectively for both areas; (1) rice with the R/C ratio of 3,30 and 4,80; (2) rubber with B/C ratio of 1,23 and 24,35; and (3) palm with the B/C ratio of 1,52. These results, if linked to the value of Appropriate Living Needs (ALN) and the minimum land area (ML) that must be fulfilled, indicate that the farmers in Sungai Ambangah could reach only 26,92% of ALN and require a minimum land of about 3,15 hectares; whereas the farmers of Pasak Piang could meet 34,53% of ALN and need a minimum land of approximately 2,54 hectares. Further, the sustainability status for the five dimensions in the existing condition of Sungai Ambangah obtained the index value of 54,82% or the category of sustainable enough for the institutional dimension, while the other four dimensions got the value of less than 50,00%, or categorized as less sustainable. As for the village of Pasak Piang, it got the index value of 52,19% or the category of sustainable enough also for the institutional dimension, whereas the other four dimensions obtained the value of less than 50,00% or considered less sustainable. The model formulated from the results of this study is based on the available local resources in both research sites, a model of sustainable farm development on swamp lands (UTLRL). Conceptually, this is also called an integrated farming model, that is, by integrating crops and livestock. The recommended policies formulated from the results of this study include: (1) the pattern of farming and increased cropping index, (2) maintenance of livestock, (3) the provision of farm capital, (4) the availability of micro finance institutions, (5) the active role of agricultural extension agencies, (6) farmers and farmer groups, (7) support from research institutions and higher education, and (8) post-harvest management and marketing.
Keyword: West Kalimantan

Judul: Potensi pengembangan lahan rawa lebak untuk perluasan lahan padi di Kabupaten Hulu Sungai Utara Kalimantan Selatan
Abstrak: Agricultural development has an important position for national food security. Increased food security is pursued through the improvement of rice production. The island of Java as the biggest rice producers continue to decrease in size field rice area, so another rice field alternative outside of Java is needed. One of them is nontidal swamp land that is still very wide, such as in Hulu Sungai Utara District South Kalimantan Province. The purpose of this study was to identify suitable land for paddy cultivation and development as well as conservation areas to safeguard the sustainability of farming, knowing the center of rice production and priority directions of development policy. Identify potential rice field using land suitability analysis by remote sensing data and processing data done in ArcGIS 9.3. Land suitability analysis using ArcGIS 9.3 with reference to the criteria established by the Department of Agriculture. Conservation area determined by reference to the Presidential Decree 32 of year 1990 on protected areas. Potential development for rice field is done by overlay spesific analysis of land suitability result and existing landuse are interpreted from the ALOS AVNIR, Landsat and Google Earth images. Centralization of activities carried out by Location Quetion Analysis and policy priorities with SWOT Analysis. The results showed that the potential development of land for rice field is still very widespread, especially in Danau Panggang Subdistrict and Paminggir Subdistrict. Peatland conservation areas are in northern and lake buffer areas in Danau Panggang Subdistrict . River buffer areas spread across the district. Policy priorities are directed to the appropriate utilization of the potential area for rice in the base region with the expansion of paddy fields.
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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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