Judul: Hubungan Sistem Ijon dengan Karakteristik Petani Manggis Desa Karacak Kecamatan Leuwiliang Kabupaten Bogor
Abstrak: Future contract (ijon marketing system) is udes when farmers can not fullfil their needs. Usualy future contract (ijon marketing system) is conducted by rural middlemen who will collect the debitas farmers yeild One of the farmers who still do future contract is management farmers in the village karacak. Problem mangosten farmers Karacak Village is need for cash.
Keyword: future contract (ijon marketing system), the charachteristics of farmers

Judul: Analisis Efisiesi Tataniaga Komoditas Manggis: Studi Kasus Di Desa Kacarak, Kecamatan Leuwiliang, Bogor
Abstrak: Mangosteen is a tropical fruit with high economic value. Its high potencial for trading require a good and efficient marketing. Bogor is placed in the second of the biggest mangosteen centers of West Java after Tasikmalaya. It has high potency in mangosteen production, especially in Karacak village, sub district of Leuwiliang. The weak of farmers' bargaining position made the selling price in farmer level become low. Unfair margin and share distribution made the bargaining position of the farmer became worsen. The high selling price both in the domestic and overseas supposed to increase the farmers profits, however the major benefit only gained by marketing institutions. Based on the research, the marketing of mangosteen in Karacak Village was inefficient.The market structure was formed into the structure that leads to imperfectly competitive markets. There were five marketing forms of mangosteen in Karacak village. Market conduct was shown by selling and purchasing practice with the deal between actors of marketing system, price formation from bargaining that tend to set into higher level by the marketing institutions. Based on the analysis of marketing margins, the farmer's share, and the ratio of benefits and costs shown that an efficient marketing mangosteen for export purposes can use the third marketing channels while domestic marketing can use the fifth channel.
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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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