Judul: Optimalisasi penggunaan input dan analisis finansial pada usaha pendederan ikan nilem di desa Rancapaku, kecamatan Padakembang, kabupaten Tasikmalaya
Abstrak: Desa Rancapaku memiliki potensi di bidang perikanan khususnya dalam usaha pendederan ikan nilem. Sebagian besar pembudidaya dalam melakukan kegiatan usahanya masih tradisional, dengan penggunaan input yang terbatas yang disebabkan oleh keterbatsan modal, sehingga dimungkinkan output yang dihasilkan belum optimal. Penelitian ini dilakukan di Desa Rancapaku pada bulan Februari samapai dengan Maret 2007 dengan tujuan untuk menentukan kondisi aktual usaha pendederan ikan nilem, penentuan tingkat input dan output yang optimal, menentukan tingkat keuntungan pada kondisi aktual dan optimal, serta menentukan kelayakan investasinya.
Keyword: 

Judul: Kinerja produksi dan optimalisasi input pada usaha pendederan ikan patin Pangasius hypophthalmus ukuran 1 inci di Desa Sukamandijaya, Subang
Abstrak: Usaha pendederan ikan patin ukuran 1 inci di Desa Sukamandijaya masih belum optimal dan dilakukan berdasarkan pengalaman. Tujuan penelitian ini adalah menganalisis kinerja produksi dan optimalisasi input produksi untuk menghasilkan keuntungan yang optimal. Metode yang digunakan berupa survei dengan metode purposive sampling dan parameter kinerja produksi didapat melalui pengamatan langsung. Data ekonomi dianalisis menggunakan fungsi produksi Cobb-Douglas dan analisis usaha. Volume wadah pendederan berkisar 3188-9860 liter dengan kepadatan berkisar 15-47 ekor/liter. Pertumbuhan panjang mutlak rata-rata ikan patin sebesar 2,77 + 0,19 cm, tingkat kelangsungan hidup sebesar 56,04 + 1,07 %, dan laju partumbuhan bobot harian sebesar 27,96 + 1,09 %. Pendugaan efisiensi penggunaan input didapatkan input yang optimal adalah 80 ekor/liter untuk larva dan 0,0919 kg/liter untuk cacing. Analisis usaha pendederan ikan patin 1 inci pada kondisi optimal adalah R/C 2,31, break even point sebesar Rp 18.060.496 dan 229.861 ekor, harga pokok penjualan Rp 34,00/ekor dan pay back period 0,47 tahun.
Keyword: 

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
Keyword: