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: Suatu Studi Tentang Konstuksi Jaringan Cantrang Dan Kemungkinan Pengembangannya Di Kotamadya Tegal
Abstrak: Penelitian ini merupakan studi kasus terhadap unit penangkapan jaring cantrang yang dilaksanakan di Kotamadya Tegal, pada tanggal 2 Juli sampai 8 Agustus 1989. Penelitian ini bertujuan untuk mengetahui konstruksi dan pengoperasian alat tangkap jaring cantrang serta aspek finansial dari usaha unit penangkapan jaring cantrang dalam satuan waktu tertentu (asumsi 1 tahun) untuk dapat acuan bagi pengembangannya. Alat tangkap jaring cantrang terdiri dari: bagian kantong, bagian badan jaring, dan bagian sayap. dijadikan sebagai Konstruksi jaring cantrang agak berbeda dengan trawl dan secara umum hampir sama dengan dogol. Jaring cantrang memiliki mulut (bibir) bagian bawah lebih panjang dari mulut atas. Dan jaring cantrang dioperasikan pada dasar perairan untuk menangkap ikan-ikan demersal. Bahan pembuat jaring cantrang adalah dari bahan sintetis (polyethylene), sedang kan tali ris atas terbuat dari polyethylene dengan diameter 4-5 mm, untuk tali ris bawah terbuat dari natural fibre (ramie) dengan diameter 10 mm. Dalam operasinya menggunakan tali selambar (warp) yang terbuat dari bahan ramie dengan diameter 10 mm dan panjang 400 depa yang ditarik (haul) oleh pesawat bantu (gardan dan mesin). Perahu yang digunakan terbuat dari Kayu Jati (Tectona grandis) yang digerakkan oleh mesin serta dilengkapi dengan pesawat bantu.
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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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