Judul: Dinamika perikanan purse seine yang berbasis di PPN Pekalongan, Jawa Tengah
Abstrak: Sumberdaya perikanan adalah sumberdaya yang dinamis. Perkembangan perikanan purse seine di pantai utara Jawa, khususnya di Pekalongan sangat dinamis sejak pelarangan alat tangkap trawl. Perubahan daerah penangkapan armada kapal purse seine mengikuti kondisi lingkungan dan keberadaan ikan Sumberdaya perikanan menurun disebabkan karena aktivitas kegiatan penangkapan ikan dan secara alamiah. Kegiatan penangkapan ikan ini mengandung ketidakpastian yang tinggi, sehingga upaya manusia (nelayan) adalah memperkecil ketidakpastian tersebut dengan melakukan proses dinamis. Untuk menerapkan pengelolaan sumberdaya ikan yang efektif dan efisien, informasi tentang dinamika perikanan perlu diketahui
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Judul: Pengukuran efisiensi teknis perikanan purse seine di Pekalongan
Abstrak: Para para pelaku usaha perikanan purse seine di utara Jawa terus mengembangkan baik sistem maupun teknik penangkapannya untuk mempertahankan usahanya. Akhir-akhir ini, pengelolaan kapasitas penangkapan ikan berikut metoda pengukurannya sudah menjadi isu penting (isu tentang kapasitas berlebih dan penangkapan berlebih) merupakan masalah serius yang dihadapi dalam pengelolaan sumberdaya pelagis kecil di Laut Jawa dan sekitarnya. Kajian pengelolaan perikanan ber6asis kapasitas penangkapan merupakan alternatif pendekatan guna mengendalikan faktor-faktor input yang tidak efisien yang digunakan dalam usaha penangkapan.
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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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