Judul: Studi Usaha Penangkapan Rajungan (Portunnus sp .) di Perairan Cambaya, Kodya Makassar Sulawesi Selatan
Abstrak: Perikanan rajungan di Indonesia belum begitu berkembang walaupun usaha penangkapan sudah cukup lama dilakukan. Hal ini karena usaha perikanan rajungan dilakukan secara tradisional dan pemasarannya masih tergantung pada pengumpul, sehingga harga jualnya menjadi rendah. Padahal sebagai komoditi ekspor, rajungan memiliki prospek yang cerah dan belum dapat dipenuhi oleh negara-negara pemasok rajungan lainnya.
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Judul: Studi Pertumbuhan dan Beberapa Aspek Reproduksi Rajungan (Portunus pelagicus) di Perairan Mayangan, Kabupaten Subang, Jawa Barat
Abstrak: Rajungan merupakan salah satu komoditas perikanan yang memiliki nilai ekonomis tinggi, terutama untuk pasar luar negeri khususnya dalam bentuk olahan daging yang telah dipisah-pisahkan dari cangkangnya. Sampai saat ini rajungan masih didapat dari alam melalui usaha penangkapan yang secara otomatis memberikan tekanan terhadap populasinya di alam: Penelitian tentang pertumbuhan dan reproduksi rajungan sangat diperlukan untuk mengetahui laju pertumbuhannya sehingga dapat diperkirakan pertambahan populasinya dalam jangka waktu tertentu serta untuk mengetahui tingkat rekruitmen populasinya sehingga dapat dijadikan dasar upaya perlindungan dan pengelolaan sumberdaya hayati rajungan di Perairan Mayangan. Tujuan dari penelitian ini adalah untuk memperoleh informasi tentang aspek pertumbuhan dan repoduksi rajungan serta memberikan informasi dasar bagi usaha pengelolaan sumberdaya hayati di Perairan Mayangan, sehingga pemanfaatannya sebagai pendapatan masyarakat Desa Mayangan, sumber protein dan sumber devisa dapat terus ditingkatkan.
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Judul: Enhancement of photon absorbtion on BaxSr1-xTiO3 thin films semiconductor using photonic crystals.
Abstrak: In this research, has been conducted BaxSr1-xTiO3 (BST) thin films manufacturing for mole fraction x = 0.25, 0.35, 0.45, and 0.55; and concentration of 1 molar using chemical solution depositon (CSD) method. The materials, which are used in this research, are barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%], titanium isopropoxide [Ti(C12O4H28), 97.999%], gallium trioxide [Ga2O3], 2-methoxyethanol [H3COOCH2CH2OH, 99%] and 1 x 1 cm of transparent conductive oxide (TCO) glass as substrate. Two BST thin films are made that for BST thin films which are doped by 10% galium (BGST) as p-type layer and pure BST solution as n-type. BST solution is made by reacting barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%] and titanium isopropoxide [Ti(C12O4H28)] into 2-methoxyethanol solvent [H3COOCH2CH2OH, 99%] in accordance with mass gram for each x value. While, BGST solution is made in the same way as BST solution, plus adding gallium at 10% of the mass of BST. Once all materials are reacted, then vibrated using ultrasonic for 90 minutes, and followed by coating BGST / BST on the TCO substrate. Once the layer is formed, then annealed for 15 hours at temperature of 500 °C with increasing rate of 1.67 oC/minute. Characterizations of BST thin films with or without photonic crystals include the absorbance and transmittance in the visible light spectrum, as well as the electrical photoconductivity characterizations. From BST thin films without photonic crystals indicate that our thin films have light absorption area on almost the entire range of the visible light spectrum even to the infrared range with absorption value over than 67.6%, in addition, it can be seen that the maximum absorbance of BST thin films for all mole fractions lie in blue to green light spectrum region, 457 nm ≤ λ ≤ 570 nm and the minimum in yellow to red light spectrum region, 570 nm ≤ λ ≤ 678 nm. The largest absorbance is found at x = 0.25 with average absorbance value of 92.04% and maximum and minimum absorbance peaks at wavelength of 500.89 and 657.72 nm, respectively. At x = 0.35, average absorbance value decreased to 83.55% with maximum and minimum peaks at 505.73 and 613.68 nm, respectively. Then increased to 91.16% at x = 0.45 with maximum and minimum peaks at 506.04 and 618.56 nm, respectively. At x = 0.55, average absorbance value decreased to 80.12% with maximum and minimum peaks at 507.85 and 608.79 nm, respectively. Moreover, it can be seen that the addition of barium mole fraction leads to wider maximum absorbance or minimum transmittance peaks and narrower minimum absorbance or maximum transmittance peaks in the same range of the green and blue & red light spectrums, respectively. BST thin films with photonic crystals show increasing in absorption for all x values in the range of 3.04 into 13.33%. At x = 0.25, average absorbance percentage increased 3.96% from 92.4 into 95.68%, for x = 0.35 average percentage increased 7.07% into 89.45 from 83.55%. Furthermore, average absorbance of BST thin films at x = 0.45 increased 3.04% from 91.16 into 93.93% and x = 0.55 has
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