Judul: Dampak Tarif Impor terhadap Produksi dan Impor Kedelai di Indonesia
Abstrak: Indonesia is a soybean importing country. Approximately 70% of Indonesian soybean consumption is fulfilled from import of soybean. There are many policies that have been promoted by Indonesian government to reduce the volume of imported soybean. One of the policies is import tariff protection. The purpose of import tariff is to protect farmers from a huge amount of imported soybean in domestic market, so the domestic soybean can compete with imported soybean. This research aimed to identify Indonesian government policies on soybean, to analyze the variable that affect the volume of imported soybean, and to analyze the tariff impact on the import volume and domestic soybean production. The analyses were conducted using descriptive analysis and simultaneous equations model. The identification of the policies to reduce the volume of imported soybean resulted the following three policies: agriculture intensification, agriculture extensification, and import tariff policies. Furthermore, the volume of imported soybean was affected by the following three variables: soybean consumption, import tariff and import volume of the preceding year. The simulation result showed that determining of 10% import tariff decrease 11.99% of import volume and increase 0.05% of domestic soybean production. However, 15% of import tariff decrease the import volume by 33.54% and increase the soybean production by 0.12%.
Keyword: simultaneous equation model, tariff, import, soybean

Judul: Dynamics of and Determinant Factors  Affecting Indonesian Soybean Imports
Abstrak: Peningkatan konsumsi kedelai di Indonesia tidak diiringi oleh peningkatan produksi dalam negeri, sehingga volume impor cenderung meningkat. Penelitian ini bertujuan untuk menganalisis dinamika impor kedelai Indonesia serta faktorfaktor apa saja yang memengaruhinya. Penelitian didasarkan atas data deret waktu tahunan dari 1988 sampai 2019, yang diperoleh dari berbagai sumber yang terpercaya. Model ekonometrik linier berganda dibangun untuk menjelaskan faktor-faktor yang memengaruhi impor dan menggunakan metode OLS untuk mengestimasinya. Hasil penelitian ini menunjukkan bahwa harga kedelai internasional, harga minyak internasional, PDB per kapita Indonesia, produksi kedelai lokal, dan krisis ekonomi tahun 1998 berpengaruh secara signifikan terhadap volume impor kedelai Indonesia. Hasil penelitian ini memperkuat dugaan bahwa kebijakan dan program yang mampu meningkatkan jumlah produksi kedelai lokal adalah cara terbaik untuk mengurangi ketergantungan terhadap impor.
Keyword: economic crisis, multiple regression, test of assumption, time series

Judul: Synthesis of Biphasic Calcium Phosphate Made of Eggshells Through A Hydrothermal Method
Abstrak: Biphasic Calcium Phosphate mixed of hydroxyapatite and tricalcium phosphate. A hydrothermal method of synthesizing by mixing CaO as calcium source and (NH4)2HPO4 as phosphate source with distilled water. CaO got from calcination process made of eggshells. All samples were synthesized using hydrothermal reactor then followed by sintering process. The molar ratio of Ca and P for all samples was 0.5 M : 0.3 M. Hydrothermal temperature and sintering temperature were variated they are 250 ºC, 300 ºC for hydrothermal and 800 ºC, 900 ºC, 1000 ºC for sintering, higher treatment temperature, tricalcium phosphate appears. Final results of synthesis were characterized by using X-ray Diffraction and Fourier Transform Infrared. X-ray Diffraction patterns was ecompared with database Join Committee on Powder Diffraction Standards and found tricalcium phosphate and hydoxyapatite.
Keyword: biphasic calcium phosphate, hydrothermal, hydroxyapatite, tricalcium phosphate