Judul: Rekayasa Lingkungan Budidaya Untuk Meningkatkan Kualitas Ikan Patin Siam (Pangasius hypopthalmus): Peran Salinitas
Abstrak: Patin siam merupakan salah satu jenis ikan air tawar yang banyak dipilih petani di Indonesia untuk dibudidayakan, namun meningkatnya produktivitas ikan patin siam belum sejalan dengan harga jualnya di pasaran. Hal tersebut disebabkan karena faktor selera masyarakat terkait penampilan fisik (warna, tekstur dan aroma), serta citarasanya yang identik dengan kandungan lemak tinggi, sehingga kurang disukai. Penelitian ini bertujuan untuk mengkaji pengaruh salinitas terhadap komposisi kimiawi tubuh ikan patin siam (Pangasius hypopthalmus) dan beberapa indikator organoleptik dikaitkan secara deskriptif dengan selera masyarakat dalam upaya peningkatan kualitas ikan patin siam terkait harga jualnya yang lebih murah. Penelitian ini dilakukan dengan menggunakan metode eksperimental laboratories dengan mengaplikasikan 4 perlakuan yaitu salinitas (0ppt, 3ppt, 5ppt dan 7ppt) selama 2 bulan (April-Juni 2009).
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Judul: Pengaruh Kejutan Salinitas dan Perendaman Larva dalam Larutan Tiroksin Terhadap Kinerja Calon Benih Ikan Patin Siam Pangasius hypophthalmus
Abstrak: There are some obstacles in Asian catfish juvenile production, especially outside the spawning season (May to September). It causes low quality of fish fry. Some manipulations are needed in order to improve the quality of juvenile. One of manipulation that can be done is hormone manipulation using thyroxin hormone and salinity shock. It was expected that thyroxin immersion and salinity shock will accelerate the larvae growth and development and also increase survival. Hormones were taken from thyrax tablet. The larvae that was used is newly hatched. The study consisted of 4 treatments and 3 replications using complete randomized design. Treatments consisted of a control, a dose of 0.05 ppm (P1), a dose of 0.1 ppm (P2), and a dose of 0.2 ppm (P3) for 1 hour immersion. Before larvae were immersed in hormone solution, a salinity shock of 20 ppt for 2 minutes were applied. Larvae was cultured in aquarium with density 40 larvae/l. The experiment was terminated at 12 days later. The result showed that larvae immersion in thyroxin solution and salinity shock 20 ppt promote the development, growth, and survival of Asian catfish larval, where dose of 0.05 ppm (P1) is the optimum level when viewed from efficiency and the economical perspective.
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Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
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