Judul: Analysis of Unequal Income Distribution with Cobb-Douglas Production Function
Abstrak: This paper studies the economic growth model by Moav (2002). Moav model shows the existence of unequal income distribution between low-income with high-income community. That kind of unequal income distribution is caused by uneven distribution of income. On this Moav model, there is one area called the threshold. Threshold becomes a benchmark to determining whether a society is categorized into low- or high- income community. The production function used in this paper is the Cobb-Douglas function. The dynamics of this model is described as difference equation of low-income, threshold, and high-income community. Simulation study on the model is carried out using Maple 13 and Mathematica 7.0 software. Overall, from the observed case, high-income community will reach a stable condition earlier, followed by the threshold, and then the low-income community.
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Judul: Analysis of Unequal Income Distribution with Cobb-Douglas Production Function
Abstrak: This paper studies the economic growth model by Moav (2002). Moav model shows the existence of unequal income distribution between low-income with high-income community. That kind of unequal income distribution is caused by uneven distribution of income. On this Moav model, there is one area called the threshold. Threshold becomes a benchmark to determining whether a society is categorized into low- or high- income community. The production function used in this paper is the Cobb-Douglas function. The dynamics of this model is described as difference equation of low-income, threshold, and high-income community. Simulation study on the model is carried out using Maple 13 and Mathematica 7.0 software. Overall, from the observed case, high-income community will reach a stable condition earlier, followed by the threshold, and then the low-income community.
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Judul: Sintesis dan Pencirian Nanokristalin FeS2 (Pirit) Metode Hidrotermal Sebagai Material Semikonduktor Sel Surya.
Abstrak: Material yang paling sering digunakan sebagai semikonduktor pada sel surya di antaranya material yang mengandung unsur Ti, Si, Zn, dan Pb dalam bentuk oksidanya. Secara praktis, material dengan kandungan unsur-unsur tersebut bersifat mahal, toksik, tidak ramah lingkungan, dan tidak melimpah di alam. Besi pirit (FeS2) yang dikenal dengan nama “Fools Gold” memiliki potensi sebagai material semikonduktor sel surya yang murah, ramah lingkungan, dan nontoksik. Tujuan penelitian ini ialah melakukan sintesis dan pencirian nanokristalin pirit menggunakan metode hidrotermal dari FeSO4, tiourea sebagai prekursor,dan PVP sebagai agen penstabil dengan variasi waktu 12, 24, dan 36 jam pada suhu 200 C. Hasil pencirian menggunakan XRD menunjukkan semua variabel waktu menunjukkan fase tunggal pirit. Nanokristalin pirit pada variabel waktu 24 jam memiliki kristanilitas dan ukuran kristalit paling tinggi, sedangkan hasil pencirian dengan SEM menunjukkan ukuran partikel seragam dan bentuk partikel kubik menyeluruh. Analisis nilai pita celah menggunakan DRS UV-Vis dengan variasi waktu 12, 24, 36 jam secara berturut-turut diperoleh sebesar 1.085 eV, 1.528 eV, dan 1.287 eV.
Keyword: nanokristalin, pirit, semikonduktor