Judul: Suatu studi tentang usaha perikanan purse seine di daerah muncar, jawa timur
Abstrak: Tujuan utama tulisan ini ialah untuk mengetahui usaha perikanan purse seine di daerah Muncar, sampai sejauh mana alat ini berfungsi bagi kegiatan perikanan di daerah tersebut. Penelitian telah dilakukan pada pertengahan bulan Desember 1930 sampai pertengahan bulan Januari 1981, di perairan Muncar, yaitu disekitar selat Bali yang terletak pada posisi antara 114° 23 30 114° 25' 10" B.T dan 08° 20' 1 11 - 40" - 1 11 03 29 00 L.S, dengan menggunakan metode case sindy. Muncar merupakan daerah perikanan yang kaya dengan hasil ikan lemurunya. Hasil tangkapan jenis ikan lemuru (Sardinella longicens) adalah 95,16 persen dari seluruh jenis ikan yang tertangkan dengan alat purse seine di tahun 1980. Purse seine di Muncar dikenal sejak tahun 1974 hingga akhir tahun 1980 jumlah alat ini telah mencapai 173 unit. Alat tangkan ini 73 unit berstatus resmi dan sisanya merupakan purse seine tidak resmi.
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Judul: Studi tentang pengolahan perikanan purse seine di mancar
Abstrak: Penelitian ini dilakukan untuk menggambarkan akan pentingnya usaha pengelolaan perikanan purse seine yang dipandang sebagai industri penangkapan. Dalam hal ini adalah: (1) pengelolaan terhadap unit penangkapan serta faktor-faktor yang berkaitan dengan kegiatan penangkapan, (2) pengelolaan biaya investasi usaha penangkapan untuk memilih kemungkinan investasi sehingga usaha ini dapat menguntungkan dan layak dilaksanakan untuk beberapa tahun mendatang. Kehadiran purse seine di Muncar telah membawa kemajuan bagi usaha penangkapan di daerah ini. Sebagai alat tangkap yang produktif, purse seine memberikan kontribusi terbesar dari seluruh hasil produksi perikanan laut di daerah tersebut. Pengoperasian purse seine dilakukan dengan menggunakan dua buah perahu. Teknik penangkapannya ialah melingkarkan jaring terhadap gerombolan ikan dan selanjutnya jaring bagian bawah dikerucutkan sehingga ikan berada dalam tubuh jaring (kantong)…
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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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