Judul: Konvergensi Harga Pangan antar Wilayah di Indonesia
Abstrak: In Indonesia, the increase in food prices usually results in the rise in the inflation rate. To cope with this problem, a better food distribution among regions is absolutely required. This study aimed to describe the dynamics of food prices, to test the convergence level of food prices and to analyze the factors that influence the changes in food prices between regions in Indonesia. The data used were obtained from the Central Agency of Statistics and the Ministry of Agriculture from 2002 to 2009. The method used was analysis of dynamic panel data (First Difference-Generalized Methode Moment/FD-GMM). The results of the study showed that all commodities of food prices were convergent, soybean at the highest level and chili at the lowest, while the factors that influence changes in food prices were production rate, Gross Domestic Product (GDP), population and infrastructure.
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Judul: Analysis of National Strategic Food Price Volatility and Its Effect on Inflation
Abstrak: Pangan merupakan kebutuhan primer yang harus terjaga stabilitas harganya. Beberapa periode terakhir harga sejumlah komoditas pangan strategis mengalami peningkatan. Penelitian ini bertujuan untuk menganalisis tingkat volatilitas harga minyak goreng, beras, cabai merah, bawang merah dan bawang putih serta pengaruhnya terhadap inflasi. Data yang digunakan adalah data harga kelima komoditas yang diperoleh dari Pusat Informasi Harga Pangan Strategis dan data inflasi diperoleh dari Bank Indonesia. Analisis yang dilakukan yakni Coefficient of Variation untuk melihat disparitas harga di seluruh provinsi di Indonesia dan pemodelan ARCH-GARCH untuk menganalisis volatilitas. Error Correction Model digunakan untuk menganalisis pengaruh volatilitas harga pangan terhadap inflasi. Hasil penelitian menunjukkan terdapat disparitas harga pangan antar waktu dan antar wilayah di Indonesia. Volatilitas harga kelima komoditas terjadi pada data harga tingkat nasional dan pada sejumlah wilayah amatan. Volatilitas harga minyak goreng serta beras berpengaruh signifkan terhadap inflasi pada jangka panjang. Sementara pada jangka pendek, volatilitas harga cabai merah dan volatilitas bawang merah bulan sebelumnya signifikan mempengaruhi tingkat inflasi, Food is a primary necessity that requires accessibility and price stability. In recent periods, the prices of some strategic food commodities have increased. The aim of this research is to analyze the level of price volatility of cooking oil, rice, red chili, shallots, and garlic, as well as their effect on inflation. The data used include the prices of these five commodities obtained from the Strategic Food Price Information Center and the inflation rate data obtained from the Bank of Indonesia. The analysis conducted includes the Coefficient of Variation to observe price disparities across all provinces in Indonesia and the ARCH-GARCH modeling to analyze volatility. The Error Correction Model is used to analyze the effect of food price volatility on inflation. The results show that price disparities occurs over time and across regions in Indonesia. Volatility in the prices of these five commodities occurs both at the national price level and in some observed regions. The price volatility of cooking oil and rice has a significant long-term effect on inflation. Meanwhile, in the short term, price volatility of red chili and shallots from the previous month have a significant effect on the inflation rate.
Keyword: ARCH-GARH, ECM, inflasi, pangan, volatilitas

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4