Judul: Pelaksanaan Usahatani Model (Model Farm ) di Wilayah Das Citanduy dan Evaluasi Ekonominya
Abstrak: Perencanaan usahatani model, ditinjau dari rencana lokasi dan layanannya, memiliki efektivitas yang cukup tinggi meskipun demikian, terdapat kelemahan dalam hal kriteria penentuan lokasi yang tidak memiliki prioritas. Penyaluran layanan usahatani model masih menghadapi masalah ketidak tepatan waktu penyaluran dengan kehutuhan petani. Faktor-faktor yang menyebabkannya ialah masalah birokrasi dan transportasi.
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Judul: Tingkat Penggunaan Tenaga Kerja, Pendapatan Dan Kondisi Konservasi Lahan Usaha tani Di Wilayah Hulu Das Citanduy : Studi Kasus Pada Lokasi Model Farm Desa Batu Sumur Kecamatan Manonjaya Kabupaten tasik Malaya
Abstrak: Salah satu bentuk usaha pengembangan pertanian yang berwawasan pada pelestarian lingkungan adalah cara berta- ni Model Farm. Model Farm merupakan paket teknologi dae- rah hulu (upland technology) yang dipraktekkan pada lahan pertanian di DAS Citanduy. Satu unit Model Farm terdiri dari lahan seluas 10 hektar. Paket teknologi yang diin- troduksikan melalui Model Farm berupa perbaikan pola ta- nam, pembuatan teras bangku, peternakan, perikanan, pe- nyediaan sarana produksi pertanian dan ditunjang oleh beberapa layanan berupa penyuluhan, kredit usahatani, subsidi, dan jalan masuk. Selain menggarap lahan pada areal Model Farm, petani juga menggarap lahan kering lainnya di luar Model Farm dan lahan sawah. Keadaan demikian menyebabkan sering terjadinya persaingan dalam hal penggunaan faktor produksi, khususnya tenaga kerja. Praktek lapang ini bertujuan untuk menganalisis perbandingan tingkat penggunaan tenaga kerja dan pendapatan (imbalan) yang diterima pada usahatani lahan sawah dengan usahatani pada lahan kering. Selain itu untuk menganalisis kondisi konservasi lahan usahatani petani peserta Model Farm...
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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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