Judul: Analisis keterkaitan antara kesesuaian lahan dengan kelayakan finansial: Studi kasus usahatani padi sawah di kawasan hulu DAS Cimanuk, kabupaten Garut
Abstrak: Sampai saat ini, sebagian besar dari sistem usaha ekonomi masyarakat pedesaan adalah sistem usahatani berbasis lahan. Penggunaan lahan dominan di kawasan hulu DAS Cimanuk, khususnya Kecamatan Banyuresmi dan Kecamatan Samarang, Kabupaten Garut adalah persawahan. Usahatani padi sawah dikembangkan pada berbagai tingkat kesesuaian lahan. Dalam upaya memberdayakan sistem usahatani yang demikian, dibutuhkan suatu sistem informasi kelayakan finansial berdasarkan tingkat kesesuaian lahan. Penelitian ini bertujuan untuk memperoleh gambaran tentang tingkat kesesuaian lahan, keragaan input-output, tingkat kelayakan finansial, serta jangka waktu pengembalian investasi usahatani padi sawah. Teknik analisis yang digunakan adalah analisis statistik deskriptif (uji taraf nyata), analisis simulasi model dengan menggunakan analisis kelayakan finansial (analisis Net Present Value, Revenue Cost Ratio, Profit Cost Ratio, dan Internal Rate of Return), serta perhitungan titik impas (Break Event Point)…dst
Keyword: lahan, padi sawah, usahatani, ekonomi petani

Judul: Pendugaan fungsi keuntungan dan analisis efisiensi ekonomi relatif usahatani padi sawah: studi pada beberapa desa di Jawa Barat
Abstrak: Penelitian ini bertujuan untuk menduga fungsi keun- tungan dan menelaah faktor-faktor yang mempengaruhi ting- kat keuntungan usahatani padi sawah, menentukan kondisi ska la ekonomi usaha ("returns to scale"). serta menelaah efi- siensi ekonomi relatif usahatani berdasar luas lahan garap- an dan berdasar lokasi (dataran tinggi dan dataran rendah). Data yang digunakan berasal dari data Resurvey hadap enam desa di Jawa Barat dalam wilayah DAS Cimanuk yang dilakukan oleh Studi Dinamika Pedesaan (SDP-SAE) ta- hun 1983. Model analisa yang digunakan adalah fungsi ke- untungan Cobb Douglas ("Cobb Douglas Profit Function Ana- lysis") dalam analisa jangka pendek berdasarkan metoda pen- dugaan Zellner. Hasil penelitian menunjukkan bahwa usahatani padi sa- wah di daerah penelitian belum memberikan tingkat keuntung- an yang maksimum kepada petani pengelolanya. Dengan kata lain penggunaan input peubah secara keseluruhan belum op- timal dalam mengalokasikannya. Namun demikian tingkat pro- duktivitas rata-rata yang dicapai yaitu 41,32 kw/ha...dst
Keyword: Field crops, Rice, Oryza, Profit function, Production function approach

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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