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.
Keyword: 

Judul: TinjauandanProyeksiHargaKomoditasPokokPanganIndonesia
Abstrak: Sufficiency of food needs for human is important because it relates to the rights of citizens and human rights. The process of production ,distribution, and consumption is strongly influenced by domestic food prices. The contribution of food prices to the inflation in Indonesia is 79,61% (Statistic Center, 2013). Fluctuations in food prices is related to biological structure of commodities and agricultural environments, time lags in decision making related to the use of inputs until sell output, market structure, and policy impact. Information of food prices can be accessed to the State Logistics Agency (Bulog), Department of Trade and Industry (Disperindag), and Statistic Center (BPS). Standardization of daily food prices report made by Ministry of Trade Indonesia through Minister Decision No.522/MPP/Kep/11/1998. This regulations do not specifically regulate the location, the quality of the commodity, and commodity branded and non-branded. this problem cause food prices data among government agencies and private companies different each other. Research on food prices fluctuation and data synergize between government agencies and private companies is important to predict the price and formulating the optimal policy in the future .Every commodities in Indonesia has different characteristics of data, average mean value, and the pattern. Therefore , the best forecasting method for one commodity not always be the best method for another commodity . Based on these problems, the objective of this study are: 1) Analyze the development of Indonesian food prices; 2) Identify synergy prices between State Logistics Agency (Bulog), Department of Industry and Trade (Disperindag) , the Statistic Center (BPS) , and results of the survey in each region; 3) Getting the best forecasting method to forecast the price of basic food commodities in Indonesia ; 4 ) Forecast the price of food commodities of Indonesia in the future . The results showed that there are 7 commodities which have increasing price significantly. Those commodities are cassava (65,44%), onions (87,50%), red chili (70,39%), beef (41,45%), eggs (33,98%) , salted fish (29,06%) and instant noodles (30,68%). Some other commodities have decreasing price. Those commodities are green beans (4,3%) , Filma cooking oil (0,80%) , and Minyakita cooking oil (5,81%). The difference between the price data from Bulog , BPS , Disperindag , and survey results up to Rp 10.177/kg for the same commodity at the same time. There are 4 best methods for forecasting Indonesian food prices. Those methods are Multiplicative winters, additive winters, quadratic trend, multiplicative decomposition, and ARIMA (Autoregressive Integrated Moving Average). Forecasting results indicate that Onion will contribute strongly effect to inflation.
Keyword: time series analysis, the synergy of data, basic food commodities

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition