Judul: Kemungkinan pengembangan perikanan cakalang di Sorong, Irian Jaya
Abstrak: Sumberdaya ikan tuna/cakalang masih merupakan andalan ekspor perikanan Indonesia, setelah udang. Nilai sumberdaya ini akan semakin besar seiring dengan semakin berkembangnya aktivitas pemanfaatan sumberdaya ini. Disadari bahwa peningkatan kualitas maupun kuantitas upaya penangkapan di suatu perairan selain akan semakin meningkatkan nilai ekonomi dari sumberdaya tersebut terhadap kesejahteraan masyarakat, khususnya masyarakat nelayan serta meningkatkan pendapatan pengusaha perikanan, juga diharapkan akan tetap mempertahankan suatu tingkat pengusahaan yang rasional yang berkesinambungan dimana sumberdaya tersebut tetap lestari. Oleh karena itu, kajian terhadap kondisi sistem perikanan yang sudah ada perlu dilakukan, guna mendapatkan suatu bentuk sistem pemanfaatan yang efisien dan efektif secara teknis-ekonomis dan tetap mempertimbangkan kelestarian sumberdaya.
Keyword: Skipjack tuna, Katsuwonus pelamis L.

Judul: Analisis musim penangkapan dan pemanfaatan sumberdaya Cakalang (Katsuwonus pelamis) di Perairan Sorong, Irian Jaya
Abstrak: Usaha pemanfaatan sumberdaya cakalang di perairan. Sorong pada hakekatnya merupakan usaha perikanan industri yang dilakukan oleh PT Usaha Mina (Persero), sebuah perusahaan Badan Usaha Milik Negara (BUMN) yang telah beroperasi sejak tahun 1973. Dalam rangka meningkatkan produksinya PT Usaha Mina menggunakan rumpon sebagai alat pengumpul ikan. Selain itu juga bekerja sama dengan nelayan tradisional yang tergabung dalam suatu kelompok yang disebut Kelompok Nelayan Tunas Jaya (KNTJ) membentuk pola PIR (Perusahaan Inti Rakyat) penangkapan cakalang dengan PT Usaha Mina sebagai inti dan KNTJ sebagai plasma. Penelitian ini bertujuan untuk menduga pola musim penangkapan ikan cakalang di perairan Sorong dan untuk mengetahui perkembangan pemanfaatan sumberdaya cakalang di perairan Sorong yang dilakukan oleh PT Usaha Mina dan Kelompok Nelayan Tunas Jaya. Metode yang digunakan dalam penelitian ini adalah analisis data sekunder yang meliputi data hasil tangkapan (ton) dan upaya penangkapan (hari operasi) ikan cakalang (Katsuwonus pelamis) di perairan Sorong, Irian Jaya. Data yang digunakan adalah data tahun 1987 - 1992.
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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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