Judul: Modifikasi dan uji teknis pompa pada mesin pemanen udang/ikan
Abstrak: Indonesia sebagai negara kepulauan memiliki potensi alam yang besar. Baik di daratan maupun perairan. Dengan potensi perairan yang besar maka pembangunan diarahkan pada pengolahan sumberdaya perairan. Berdasarkan data Statistik Perikanan Budidaya (2002) perkembangan ekspor udang Indonesia dalam kurun waktu 1998-2001 terus meningkat. Pada tahun 1998 volume ekspor udang Indonesia sebesar 142.116 ton dengan nilai US$ 1 milyar, pada tahun 2001 nilai ekspor udang mencapai US$1.07 milyar dan pada tahun 2002, 50% dari total nilai ekspor perikanan Indonesia berasal dari komoditas udang ini (sikitar 2 milyar US$)
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Judul: Modifikasi dan Uji Fungsional Mesin Pemanen Udang Tipe Vakum
Abstrak: In Indonesia, the fishery commodities that can be developed are fish and shrimp. Fish and shrimp commodities is not only marketed in Indonesia but has been marketed overseas. So, the whole of the production process must be considered, one of them is harvesting that produced high-quality products. So far the harvesting process of fishery commoditiesin in Indonesia is still using the traditional method. The object of this research is to modify fish and shrimp harvester to produce an efficiency and effectiveness of harvesting machinery so that can be maintained the quality of fish and shrimp. Stages of this research are started from problems identification, analysis of the design, modification, and functional testing. Fish and shrimp harvester consist of vacuum pump and water pump. The functional aim of water pump is to suck commodities from the pond, where as and the vacuum pump is to maintain the vaccum condition inside the system. The results of this research obtained flow rate and suction velocity average are 1.84 l/s and 0.23 m/s in the tank 1. While in the tank 2, flow rate and suction velocity average are 1.63 l/s and 0.52 m/s respectively. At the end of this research, this modified fish and shrimp harvester is still not able to show good performance, and still need to conduct further research.
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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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