Judul: Kelayakan Usaha Budi Daya Rumput Laut Kappaphycus alvarezii dengan Metode Longline dan Strategi Pengembangannya di Perairan Karimunjawa
Abstrak: One of Jepara regency water locations that have the potential of land resources for the development of aquaculture is Karimunjawa waters. Seaweed is the most widely cultivated in the Karimunjawa waters is Kappaphycus alvarezii, because low venture capital, high market demand, low-cost production technology, production cycle is short, post-harvest handling is easy and simple as well as market share is still open. This study aims to (1) Evaluate the feasibility of seaweed cultivation; (2) Identify factors that influence internal and external business seaweed cultivation; (3) Develop appropriate strategies in business development efforts to the cultivation of seaweed. Financial feasibility analysis results show that seaweed cultivation efforts Kappaphycus alvarezii with longline method in Karimunjawa waters financially profitable and feasible. This is indicated by a positive NPV value of 30.81 million rupiah; B/C ratio (2.69), IRR (47.58%); PBP 1.61 years; BEP 13.23 million rupiah or sales of 1,474 kg of dried seaweed. With a total score value of the internal-external matrix of 2.52 and 2.83 shows an internal and external matrix of responses given by business seaweed cultivation to the environment considered average. The combination of these two values indicates that the position of the business lies in V cells or growth strategies. The most appropriate strategies for business development is the empowerment of members and business groups to increase their business (5.83), and increased cultivation of technical skills for the improvement of product quality (5.52). These three strategies can be implemented simultaneously as mutually supporting one another.
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Judul: Kajian Kelayakan Usaha Budidaya Gracilaria dan Evaluasi Kinerja Kelompok “Budidaya Rumput Laut Serang Utara” di Kabupaten Serang
Abstrak: The utilization of marine and fishery potential has the economic prospect for Indonesia. Indonesia waters blessed with abundant and diverse of marine living resources. One of those marine resources is seaweeds. From the various type of seaweed that existed in Indonesia waters, Gracilaria is one of the seaweed with high economical values in Indonesia, especially for the manufacture of agar (jelly). Seaweed is one of commodity that cultivated in the sea and ponds, and become one of international commodities in trading. Serang district is one of the regions where the Gracilaria utilization is not yet optimized. Data in 2010 shows, Serang revenues of approximately 19.25 billion rupiah with the total land used about 500 hectares from 5,000 hectares of total land. 4,500 hectares that remained unutilized with potential revenue of Rp. 101.25 billion, or in other words the lost amount of potential revenue in Serang district is up to 5-fold or 80% of the total potential revenue. This study aims to determine if seaweed species of Gracilaria worth to cultivate and to measure the work performance carried out by the group in their seaweed business development. This study is a study conducted in Serang district which has a potential development of Gracilaria species. In this study, the research used quantitative approach. Data is collected using primary and secondary data. The sampling technique used was purposive method. The sample in this study were all members of the group "Budidaya Rumput Laut Serang Utara" and the customer of business group "Budidaya Rumput Laut Serang Utara". The feasibility study of seaweed cultivation using secondary data sources, while the assessment of the work performance group "Budidaya Rumput Laut Serang Utara" uses primary data with BSC method which based on survey results, as well as secondary data for the assessment of multiple perspectives. The results shows, based on the analysis of the feasibility of seaweed cultivation of Gracilaria, the market and marketing aspects, technical aspects, financial aspects, political and socio-economic aspects, environmental aspects, aspects of human resources and legal aspects gives positive results. While the results of work performance of each BSC perspective shows: (1) The perspective of membership (83.42%), (2) Perspective of Learning and empowerment (71.83%), (3) Internal business process perspective (55.8%), (4) Financial Perspective (39.23%). After multiplication by each of the perspective, the achievement of the overall performance is KBRLSU 63.72%, or still below 80%.
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Judul: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa