Judul: Model Usaha Penangkapan ikan Dengan Jaring Cantrang di Kecamatan Wiradesa, Kabupaten Pekalongan, Jawa Tengah
Abstrak: Jaring cantrang merupakan alat yang cukup produktif dan banyak dioperasikan oleh nelayan-nelayan di Kecamatan Wiradesa Kabupaten Pekalongan. Penelitian ini bertujuan untuk mengetahui suatu model produksi pada usaha penangkapan ikan dengan jaring cantrang, mempelajari hubungan antara faktor-faktor produksi terhadap nilai produksi pada usaha penangkapan ikan dengan jaring cantrang, dan melakukan analisa skala usaha penangkapan ikan dengan jaring cantrang di Wiradesa, Pekalongan. Penelitian ini dilaksanakan di Kecamatan Wiradesa, Kabupaten Pekalongan, mulai dari 1 April sampai 30 Mei 1990. Metode yang digunakan dalam penelitian ini adalah metode survei. Hubungan antara faktor-faktor produksi terhadap nilai produksi disederhanakan menjadi suatu model.
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Judul: Model produklsi penangkapan jaring udang di Cimalaya, Kab. Karawang Jawa Barat
Abstrak: Pengambilan data dilakukan pada tanggal 14 Februari sampai 20 Juni 1990, dengan menggunakan metode survei. Penelitian ini bertujuan untuk: (1) Mengungkapkan model produksi penangkapan udang dengan menggunakan trammel net (jaring udang), (2) Menganalisa faktor produksi yang berpengaruh terhadap produksi udang, (3) Untuk mengetahui skala usaha penangkapan jaring udang. Hubungan antara faktor-faktor produksi dengan produksi dapat disederhanakan menjadi suatu model. Model fungsi produksi unit jaring udang didekati dengan menggunakan fungsi produksi Cobb-Douglas, produksi udang (Y) sebagai variabel tak bebas, sedangkan tenaga kerja (X1), solar (X2), GT perahu (X3), jaring (X4), PK mesin (X5) dan lama operasi penangkapan (X6) sebagai variabel-variabel bebas. ...
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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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