Judul: Strategy for Development of Superior Commodity  Based Capture Fisheries System at Logending Coastal Fishing Port Kebumen Central Java
Abstrak: Hasil tangkapan ikan di PPP Logending periode tahun 2016–2019 berfluktuasi, sementara itu nilai produksi cenderung naik. Hal ini disebabkan oleh beberapa faktor, seperti pendangkalan kolam pelabuhan dan faktor cuaca. Kondisi ini menjadi fokus kajian dengan menetapkan kebijakan yang tepat untuk pengembangannya berbasis komoditas ikan unggulan. Tujuan penelitian adalah menentukan sumber daya ikan komoditas unggulan, mendeskripsikan kondisi sistem perikanan tangkap, serta merumuskan prioritas kebijakan dalam strategi pengembangan perikanan tangkap komoditas unggulan yang berbasis di PPP Logending. Penelitian menggunakan pendekatan sistem. Pengambilan data lapang menggunakan metode survei. Analisis data meliputi aspek biologi, teknis, finansial, dan sosial, serta analisis hierarki proses. Hasil penelitian menunjukkan sumber daya ikan unggulan adalah ikan layur, bawal putih, dan tenggiri dengan nilai skor masing-masing (3,76; 2,25; dan 1,47). Musim penangkapan ikan terjadi pada bulan Agustus–November. Alat tangkap dominan gillnet dan trammel net dengan kapal berukuran 1–3 GT. Alternatif prioritas strategi pengembangan perikanan tangkap berbasis komoditas unggulan di PPP Logending adalah kualitas sumber daya manusia dengan nilai rasio kepentingan 0,620., The catch of fish at PPP Logending for the period 2016–2019 fluctuates, while the value of production tends to increase. This is due to several factors, such as siltation of the harbor pond and weather factors. This condition became the focus of the study by determining the right policy for its development based on superior fish commodities. The objectives of the study were to determine the fish resources of superior commodities, describe the condition of the capture fisheries system, and formulate policy priorities in the development strategy of superior commodity capture fisheries based at PPP Logending. The research used a system approach. Field data collection using survey method. Data analysis included biological, technical, financial, and social aspects, as well as hierarchical process analysis. The results showed that the leading fish resources were hairtail fish, white pomfret, and mackerel with respective score values (3.76; 2.25; and 1.47). The fishing season occurs in August–November. The dominant fishing gear is gillnet and trammel net with vessels of 1–3 GT. Alternative priority strategy for the development of capture fisheries based on superior commodities at PPP Logending is the quality of human resources with an importance ratio value of 0.620.
Keyword: analytical hierarchy process, development strategy, Kebumen, PPP Logending, superior commodities

Judul: Peran Subsektor Perikanan Tangkap terhadap Pembangunan Daerah serta Komoditas Hasil Tangkapan Unggulan di Kota Pekalongan
Abstrak: Pekalongan city has quite potential aquatic resources. Average annual production value was 57.409.699 kg or 27.45% of Central Java province total production which was 209.149.881 kg. This can be used maximally to improve the contribution to PDRB. Therefore it is necessary to formulate a development strategy aimed at enhancing the role of the capture fisheries sector in regional development. The results indicate that the LQ calculations based on the indicators of GDP and employment is a sector basis with LQ values greater than 1. Based on the analysis of the multiplier effect during the period 2003-2008, GDP indicator and the indicator of labor, capture fisheries sub-sector gave a positive impact on regional development of Pekalongan city. Based on the determination of superior fishery sub-sectors commodities, such as manyung (Arius sp.) from demersal fishes. Small pelagic group of selar (Caranx leptolepis), layang (Decapterus rocelli), tembang (Clupea fimbriata), lemuru (Clupea longiceps), kembung (Rastelliger). Large pelagic group of tongkol (Euthynnus spp) and tenggiri (Scomberomerus commersoni). Soft animal group are squids (Loligo sp.). SWOT analysis resulted three alternative development strategy, which are 1) Focusing on improving the captured quality by maximizing fish transport vessels and quality testing laboratory to produce high quality fresh and processed fish products, which have high economic value and provide convenience to the public on access to facilities and infrastructure in new business development in the field of fisheries; 2) Develop a sustainable fisheries sector through the use of the opportunities for employment and high quality of capture product to increase the contribution of capture fisheries toward regional PDRB; and 3) Provide convenience for fisherman in all regulations and documents, so that fishermen can remain consistent and able to use the potential of marine resources that are available and can meet the demand for products from outside the area.
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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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