Judul: Pemanfaatan zeolit dan karbon aktif pada sistem pengepakan tertutup ikan corydoras Corydoras aenus dengan kepadatan tinggi
Abstrak: Budidaya ikan hias sangat berkembang pesat di Indonesia. Oleh karena itu, Indonesia merupakan salah satu negara pengekspor ikan hias utama di dunia Internasional. Salah satu ikan hias yang sedang mengalami peningkatan permintaan di tahun 2007 ini adalah ikan Corydoras.
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Judul: Produksi Ikan Corydoras Corydoras aenus pada Padat Penebaran 8, 12 dan 16 Ekor/liter dalam Sistem Resirkulasi.
Abstrak: Salah satu ikan hias yang berprospek untuk dikembangkan adalah ikan corydoras (Corydoras aeneus). Permintaan ikan corydoras dari beberapa negara Eropa dan Asia cukup tinggi yaitu sebanyak 10.000 – 20.000 ekor/bulan, akan tetapi permintaan tersebut belum mampu dipenuhi produksi dalam negeri (Marliani, 2007). Hal ini disebabkan oleh rendahnya produktivitas para pembudidaya yang masih menggunakan sistem tradisional dengan padat penebaran yang rendah, yaitu kurang dari 3 ekor/liter yang dipelihara pada bak-bak semen di luar ruangan. Upaya intensifikasi budidaya ikan corydoras dapat dilakukan dengan meningkatkan padat penebaran dan pengelolaan lingkungan perairan yang baik dengan sistem resirkulasi. Kepadatan yang optimal dapat memaksimalkan produksi. Penentuan kepadatan yang optimal merupakan langkah awal yang penting pada kegiatan budidaya.
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Judul: The Effects of Variance of Interest rate to Variance of Annuity Future Values
Abstrak: Time value of money is a concept that refers to the difference of the value of money due to time difference. The value of money for present time would not be the same as the value of money in the future. The value of money for present time is called as Present Value (PV) of the money and the value of money for future time is called Future Value (FV) of the money. Determination the value of money, for present and future time, depends on the time and rate of return. The value of money is determined by several factors such as inflation, fluctuation of interest rates, and government policy in securities and taxation. Due to fluctuation of the value of money we need a FV formulation, it is useful for knowing whether an investment can be profitable or not, and this information is useful also in budget analysis. Annuity is defined as a series of payments made for a specific period. The payment, fixed or varied, can be made at the beginning or at the end of the period. Annuity paid at the beginning of the period is called annuity-due and annuity paid at the end of the period is called immediate annuity-certain. The accumulated value of the annuity after few years later is called as a final value or a future value. Burnecki et al. (2003) have discussed about the FV of a fixed-rate annuity in which payments are made according to the arithmetic or geometric series. They have also examined FV for annuities in which payments are made according to arithmetic or geometric series with random rates of interest. This paper examines FV for annuity-due in which payments are made according to arithmetic or geometric series with interest rates as a random variable, which is normal distribution ,  . Future value formula is expressed in recursive form. FV for annuity-due which payments are made according to the arithmetic or geometric series with random rates of interest is calculated by theoretical way and simulation way. The random rates of interest is denoted as k k i  i  , where k i an independent random variable; i is a constant and k  is a random variable which has normal distribution ,  . By using the determined parameters, a sequence of random rates of interest are generated for theoretical calculation. Meanwhile for the simulation, the random rates of interest is generated 1000 times for the simulation. The generated data give mean value, variance, and standard deviation. Moreover, error of mean value, variance, and standard deviation from the theoretical and simulation results are calculated. Error calculation uses Symmetric Mean Absolute Percentage Error (SMAPE). The smaller the value of SMAPE is the more accurate the simulation. The interest rate variances are varied from 0.000036 to 0.0001 to study the relationship between variance of rates of interest and variance of future value. The theoretical and simulation results show that when the variance of random rates of interest increases, then the variance of FV increases linearly. FV of the annuity-due in
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