Judul: Determinants of the Success of Redenomination Policy in Indonesia Based on the Online Experimental Economics Approach
Abstrak: Rupiah saat ini menjadi salah satu nilai tukar terendah di dunia membuat melemahnya kinerja perekonomian Indonesia. Sehingga, kebijakan redenominasi menjadi salah satu alternatif kebijakan yang dapat diterapkan di Indonesia untuk mendorong kinerja perekonomian. Beberapa negara telah menerapkan kebijakan redenominasi tetapi mendapatkan hasil yang berbeda. Penelitian ini menggunakan metode percobaan ekonomi untuk mengkaji pengaruh beberapa faktor seperti jenis inflasi, sistem transaksi, jenis barang, dan pertumbuhan ekonomi pada proksi kondisi perekonomian, yaitu perubahan jumlah dan harga transaksi sebelum dan setelah diterapkannya kebijakan redenominasi. Berbeda dengan penelitian sebelumnya, penelitian ini dilakukan dengan sampel yang lebih besar melibatkan 864 pelaku eksperimen dengan total 72 kali ulangan. Penelitian dilakukan mengembangkan laboratorium ekonomi secara virtual. Metode yang digunakan untuk analisis adalah ANOVA (Analisis Ragam) dan Uji Lanjut Beda Nyata Terkecil (BNT). Hasilnya menunjukkan bahwa tidak ada perbedaan jumlah transaksi sebelum dan setelah kebijakan redenominasi. Sedangkan perubahan harga transaksi saat periode sebelum dan sesudah pemberlakuan kebijakan redenominasi ditentukan oleh interaksi antar faktor-faktor yang diteliti. Kondisi ideal untuk menerapkan kebijakan redenominasi adalah disaat pertumbuhan ekonomi tinggi dengan tingkat inflasi rendah dan dilengkapi dengan informasi pasar yang sempurna antara para pelaku ekonomi. Upaya yang dapat mendukung kesuksesan redenominasi adalah dengan adanya sosialisasi dan masa transisi kebijakan., Rupiah is currently one of the lowest exchange rates globally, weakening Indonesia's economic performance. Thus, the redenomination policy is one of the alternative policies that can be applied in Indonesia to boost economic performance. Several countries have implemented redenomination policies but got different results. This study uses an economic experiment method to examine the effect of several factors such as the type of inflation, transaction system, type of goods, and economic growth on the proxy of economic conditions, namely changes in the number and price of transactions before and after the implementation of the redenomination policy. In contrast to previous studies, this study was conducted with a larger sample involving 864 experimenters with 72 replications. The research was conducted to develop a virtual economics laboratory. The method used for the analysis is Analysis of Variance (ANOVA) and Post-Hoc Least Significant Difference Test (LSD). The results show no difference in the number of transactions before and after the redenomination policy. Meanwhile, the interaction between the factors studied determines changes in transaction prices during the period before and after implementing the redenomination policy. The ideal condition for implementing a redenomination policy is when economic growth is high with a low inflation rate and is equipped with perfect market information among economic actors. Efforts that can support the success of redenomination are through socialization and a policy transition period.
Keyword: experimental economics, economic growth, elasticity, inflation, redenomination, the transaction system

Judul: Factors Influencing the Success of Currency Redenomination: Historical and Experimental Approach
Abstrak: Redenomination is a simplification of nominal value of currency by reducing digit (zero number) without reducing the real value of the currency. Factors Influencing the Success of Currency Redenomination is a research about whether the economic conditions at the time of redenomination, such as inflation and economic growth, may affect the success of currency redenomination implementation. The success of redenomination can be seen from changes on the level of inflation and economic growth after the redenomination policy is applied. This research is useful for central bank and government to provide inputs in the preparation of the Rupiah Price Changes Draft Law, especially in terms of timeliness of redenomination policy implementation. This study has three objectives that include the following: (1) to examines the factors that affect the successful of currency redenomination implementation in a country; (2) to analyze the effect of redenomination policy on changes of selling prices, number and value of transactions in the market in a variety of different economic conditions; and (3) to assess public perceptions, as producers and consumers, toward Rupiah redenomination policy. This research was based on primary and secondary data. Primary data obtained through simulation experiments of buying and selling rice. The primary data used are responses of 48 experimental subject as economic actors in the experiments. In addition, primary data were also obtained through a survey of 168 respondents. Secondary data used are historical data economic indicators of 30 countries that have been redenominated their currencies from 1963 to 2008. Multiple regression model is used to examine the factors that affect the successful of currency redenomination implementation. Meanwhile, primary data generated through experimental design were analyzed using different test mean values of two independent populations. Afterward, descriptive analysis is used to describe the public perceptions of redenomination policy. Multiple regression model indicates that the successful of redenomination tends to be influenced by economic conditions when a country implements its currency redenomination. Countries that implement redenomination when inflation rate was low (<10%), then inflation rate one year thereafter will be lower than countries that implement redenomination when inflation rate was high (≥10%). Meanwhile, inflation will decrease and economic growth will rise higher after redenomination, if previously a country have experienced high economic growth as well. Based on experimental results of buying and selling rice, when inflation was high, redenomination policy could increase the selling price. Otherwise, when inflation was low, redenomination could decrease the selling price. Changes in selling price after redenomination was not affected significantly by differences in economic growth conditions. In different economic conditions, redenomination policy did not significantly affect the changes number of transactions and total value of transactions in the market. From the survey results, public did not believe government can control inflation after redenomination. Redenomination also will not affect consumption pattern and public is not too convinced redenomination can strengthen the Rupiah exchange rate. The important thing on currency redenomination is economic conditions at the time of policy implementation. It would be better if redenomination implemented when the economy is in good and stable condition, such as low inflation rate and
Keyword: Economic Growth, Experimental, Inflation, Redenomination

Judul: Hydrothermal Synthesis of Biphasic Calcium Posphate
Abstrak: Biphasio calsium phosphate (BCP), which was a mixture of hydroxypatite (HA) and tricalcium phosphate (TCP), was synthesized by hydrothermal method followed by sintering process. Hydroxyapatite was produced by using natural calcium source CaO from hen's eggshell and (NH4)2HPO4 as phosphate souce, other hydroxyapatite sample was produce by using synthetic calcium source Ca(OH) and H3PO4 as phosphate source.
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