Judul: Suatu Analisa Tentang Jenis-Jenis Alat Penangkapan Ikan di Tanjung Luar, Kabupaten Lombok Timur (Nusa Tenggara Barat)
Abstrak: Luas porairan last dangkal di Asia Conggara diperkirakan mencapai 20 dari jumlah perairan dangkal di dunia. Indonesia memiliki sebagian besar dari peroiran dangkal tersebut yang cenderung mempunyai produktivitas cukup tinggi. Alam tropis, seperti halnya Indonesia memiliki sojumlah besar jenis-jenis ikan, tetapi pengusahaan sumber-sumber porikanan belualah seperti apa yang diharapkan, sehingga kesempatan untuk membangun perikanan Danih cukup luas (UA, 1978). wajuan pembangunan perikanan tersebut di atas dalah untuk memanfaatkan sumberdaya perikanan secara topat untuk memenuhi kebutuhan hidup manusia dengun memperhatikan keloutariannya. ...
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Judul: Suatu Analisa Unit-Unit Penangkapan Ikan di Kabupaten Ketapang, Kalimantan Barat
Abstrak: Penelitian dilakukan di Kabupaten Ketapang, Kaliman- tan Barat mulai dari tanggal 7 Mei sampai dengan tanggal 9 Juni 1984. Metode yang digunakan dalam penelitian ini adalah metode survai. Tujuan penelitian adalah untuk mengetahui keadaan umum perikanan laut dan menentukan beberapa unit penangkapan ikan yang mempunyai kemungkinan baik untuk dikembangkan di Kabupaten Ketapang. Potensi perikanan laut di Kabupaten Ketapang diduga masih cukup besar. Dengan luas perairan 20 000 km², poten- si perikanan pelagis dan demersal diperkirakan masing-ma- sing sebesar 13 000 ton dan 23 800 ton per tahun. Pada tahun 1983 tingkat usahanya baru mencapai 30,90 persen, sehingga potensi pengembangannya masih 69,10 persen. Pada tahun 1983, di Kabupaten Ketapang terdapat 2 181 unit alat penangkapan ikan yang terdiri dari 10 je- nis, yaitu pukat pantai, jaring insang hanyut, jaring ling- kar, jaring insang tetap, kelong, rawai tetap, serok, pan- cing, sero dan jenis alat lainnya. Perahu dan kapal motor panangkapan ikan berjumlah 1 189 buah yang terdiri dari parahu tanpa motor 734 buah, motor tempel 275 buah dan ka- pal motor 180 buah. Jumlah nelayan sebanyak 2 867 orang. Hak Enam jenis alat penangkapan ikan, yaitu pukat pantai, jaring insang hanyut, jaring lingkar, jaring insang tetap, rawai tetap dan sero telah dianalisa dari segi biologis, efisiensi teknis, efisiensi ekonomis dan analisa sosial. Hasil analisa menunjukkan bahwa jaring lingkar mendu- duki ranking teknologi tertinggi, disusul kemudian oleh jaring insang hanyut, rawai tetap, pukat pantai, jaring insang tetap dan sero. Perairan Kabupaten Ketapang masih dalam taraf kurang upaya (under exploited). Oleh karena itu perlu penambahan upaya (fishing effort) untuk mengelola sumberdaya tersebut, agar potensi perairan Kabupaten Ketapang dapat dimanfaatkan secara optimal….
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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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