Judul: Estimation of Indonesia's Printing and Writing Paper Export Demand Function
Abstrak: Permintaan printing and writing paper dunia terus menurun dengan berkembangnya teknologi informasi. Walaupun permintaan dunia berkurang, printing and writing paper masih menjadi produk ekspor kertas utama Indonesia. Penelitian ini bertujuan untuk mengestimasi fungsi permintaan ekspor printing and writing paper Indonesia. Estimasi dilakukan dengan teknik Panel data analysis menggunakan data dari 30 negara tujuan ekspor untuk periode tahun 2009—2019. Tiga model data panel diinvestigasi: pooled, fixed effect, dan random effect; dan kemudian dibandingkan dengan menggunakan uji Chow, Breusch-Pagan, dan Hausman. Hasil estimasi awal menunjukkan adanya autokorelasi dan heteroskedastisitas. Koreksi berhasil dilakukan untuk model pooled dan fixed effect, tetapi model random effect masih memiliki autokorelasi. Hasil uji Chow dan Breusch-Pagan menolak pooled sebagai model yang lebih baik. Hasil uji Hausman menunjukkan model fixed effect adalah model terbaik dengan elastisitas harga sebesar -0.94 dan elastisitas pendapatan sebesar 1.09 serta nilai R2 sebesar 0.96., Demand for printing and writing paper in the world is decreasing as information technology grows. Despite a decrease in world’s demand, the printing and writing paper is still the primary paper export products of Indonesia. This study aims to estimate Indonesia’s printing and writing paper export demand function. Estimation was done using panel data analysis technique with data from 30 export partner countries for the period 2009—2019. Three panel data models were investigated: pooled, fixed effect, and random effect models; and then compared using Chow, Breusch-Pagan, and Hausman tests. Results detected heteroscedasticity and autocorrelation. After correction, pooled and fixed effect models were suitable, but random effect model still had autocorrelation. Chow and Breusch-Pagan tests rejected pooled model as the best model. Hausman test indicated fixed effect model was the best model with price elasticity of -0.94, income elasticity of 1.09, and R2 value of 0.96.
Keyword: panel data, fixed effect model, random effect model, pooled model, paper products

Judul: Export Performance and Estimation Export Demand Function of Indonesian Wooden Furnitures
Abstrak: Nilai ekspor wooden furnitures Indonesia pada tahun 2007 adalah USD 1.5 miliar dan menurun menjadi USD 1.1 miliar pada tahun 2018, suatu penurunan sebesar 31.9% atau 3.4% per tahun, di sisi lain pada periode yang sama pertumbuhan ekspor wooden furnitures dunia meningkat sebesar 5.8% atau 0.5% per tahun. Oleh karena itu penelitian ini bertujuan menganalisis kinerja ekspor wooden furnitures Indonesia dan mengestimasi fungsi permintaan ekspor wooden furnitures Indonesia oleh dunia agar mengetahui pertumbuhan ekspor dalam rangka mengembangkan industri wooden furnitures Indonesia di masa depan. Kinerja ekspor dianalisis menggunakan Constant Market Share (CMS) untuk mengukur dinamika pertumbuhan ekspor wooden furnitures Indonesia. Estimasi fungsi permintaan ekspor produk wooden furnitures dianalisis dengan regresi panel data. Tiga macam pendekatan yang digunakan dalam mengestimasi model dalam panel data yaitu model pooled (Pooled Least Square), model efek tetap (Fixed Effect), dan model efek acak (Random Effect). Hasil penelitian menunjukkan pertumbuhan ekspor produk wooden furnitures Indonesia pada periode 2007-2018 menurun dengan tajam terutama disebabkan oleh menurunnya faktor daya saing, diikuti oleh faktor komposisi komoditas dan faktor distribusi pasar. Efek positif pertumbuhan standar yang merefleksikan peningkatan ekspor dunia tidak cukup besar untuk mengatasi penurunan ekspor tersebut. Fungsi permintaan ekspor produk wooden furnitures Indonesia dapat diestimasi menggunakan model efek tetap dengan nilai elastisitas harga relatif, elastisitas pendapatan, dan adjusted R2 berturut-turut -0.45, 0.8, dan 0.99. Variasi permintaan ekspor wooden furnitures Indonesia dapat dijelaskan dengan sangat baik. Kata kunci: CMS, fungsi permintaan ekspor, kinerja ekspor, regresi panel data, The export value of Indonesian wooden furnitures in 2007 was USD 1.5 billion and decreased to USD 1.1 billion in 2018, a decreased of 31.9% or 3.4%/year. On the other hand, the growth of global wooden furnitures export increased by 5.8% or 0.5%/year in the same period. This study aims to analyze export performance and estimate export demand function of Indonesia wooden furnitures that would be used for policy development of Indonesia wooden furnitures industry. Export performance was analyzed using Constant Market Share (CMS) and estimation export demand function was analyzed using panel data regression. Three types of approaches were used in estimating models in panel data, which were pooled least square model, fixed effect model, and random effect model. The results showed that the export performance of wooden furnitures in 2007-2018 sharply declined mainly due to the decline in competitiveness, followed by commodity composition effect and market distribution effect. The positive effect of global market growth reflects an increase of Indonesia export but it was not large enough to overcome the decline of export. The export demand function of Indonesian wooden furnitures can be estimated using fixed effect model. The values of relative price elasticity, income elasticity and adjusted R2 were found to be -0,45, 0,8, and 0,99, respectively. The variations in export demand of Indonesian wooden furnitures could be explained very well. . Keywords: CMS, export demand function, export performance, panel data regression
Keyword: CMS, Export Demand Function, Panel Data Regression, Export Performance

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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