Judul: Leslie Matrix Model and Life Table in Predicting Population Growth Rate
Abstrak: Salah satu masalah bidang kependudukan adalah mengontrol laju pertumbuhan penduduk di suatu wilayah atau negara. Terdapat beberapa pertimbangan yang harus diperhatikan dalam menghitung laju pertumbuhan penduduk yaitu jumlah angka penduduk yang bertahan hidup, tingkat kelahiran dan tingkat kematian. Salah satu metode dalam menghitung pertumbuhan penduduk adalah dengan menggunakan matriks Leslie. Terdapat tiga jenis kuantitas yang perluditinjau, yaitu nilai eigen, vektor eigen, dan jumlah penduduk satu periode berikutnya. Dalam matriks Leslie nilai eigen memperlihatkan perubahan jumlah penduduk. Dengan menggunakan MAPE pada prediksi jumlah penduduk tahun berikutnya dapat diketahui sejauh mana besarannilai prediksi menyimpang dari database. Model pertumbuhan penduduk ini diaplikasikan pada kasus penduduk di Amerika Serikat tahun 2010 yang melibatkan suatu lembaga statistik nasional Amerika Serikat dalam memperoleh data. Hasil dari implementasi, diperoleh prediksi jumlah penduduk pada 5 tahun, 10 tahun, dan jangka panjang., The challenge of addressing population dynamics within a specific region or country revolves around effectively managing population growth. Several factors play a role indetermining the rate of population growth, such as survival rates, birth rates, and death rates. The utilization of the Leslie matrix offers one method for calculating population growth. Within this framework, three crucial components warrant careful consideration: eigen values, eigen vectors, and the projected population size in a subsequent period. The Leslie matrix employs eigen values to represent population changes. The Mean Absolute Percentage Error (MAPE) can be analyzed to gauge the deviation between predicted and actual population values for the upcoming year. This population growth model was applied to the United States population in 2010, utilizing data obtainable from a national statistical agency. The implementation yielded population predictions for 5-year, 10-year, and long-term intervals.
Keyword: Life Table, Eigen Value, Leslie Matrix, MAPE

Judul: Analysis of stable and quasi-stable population growth models
Abstrak: Model pertumbuhan penduduk merupakan hal yang penting dalam mengantisipasi persoalan ekonomi, social, dan politik dalam suatu bangsa yang diakibatkan oleh perubahan jumlah penduduk. Perubahan jumlah penduduk dapat dipengaruhi oleh faktor fertilitas, mortalitas , dan migrasi. Karya ilmiah ini bertujuan untuk memodelkan pertumbuhan penduduk stabil dan kuasi-stabil lalu mengaplikasikannya dalam penduduk Indonesia tahun 2000, 2005 dan 2010. Hasil proyeksi akan dibandingkan dengan data sensus lalu akan diperoleh nilai galatnya. Hasil penelitian menunjukkan bahwa model kuasi-stabil dengan adanya faktor perbaikan kematian lebih baik daripada model stabil. Berdasarkan model kuasi-stabil hasil proyeksi penduduk Indonesia tahun 2015 sebesar 255,236,560. Keywords : pertumbuhan penduduk, kuasi-stabil, fertilitas, mortalitas., Model of population growth is essential to anticipate problems in the economic, social and political in a nation that affected by the change of population. Changes in a population can be affected by factors of fertility, mortality, and migration. This paper aims to model stable and quasi-stable population growth and then applies these models to population of Indonesia for 2000, 2005 and 2010. The projection results is compared to the census data and then error value will be obtained. The results showed that the quasi-stable model with mortality improvement factor is better than the stable model. Based on the quasistable model, prediction of population of Indonesia in 2015 is 255,236,560. Keywords: population growth, quasi-stable, fertility, mortality
Keyword: pertumbuhan penduduk, kuasi-stabil, fertilitas, mortalitas

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