Judul: Pencemaran predator Curinus coeruleus Mulsant (Coleoptera : Coccinellidae) dan kemampuan predator tersebut menekan populasi kutu loncat lamtoro, Heteropsylla cubana Crawford (Homoptera : Psyllidae)
Abstrak: Penelitian ini bertujuan untuk mengetahui pemencaran C. coeruleus dan kemampuannya menekan laju Kutuloncat populasi coeruleus I amtoro.: Percobaan pemencaran C. dilaksanakan di kebun kopi dan kebun panili yang berpenaung 1 amt oro. kebun. Seratus pasang kumbang predator dilepas di tengah Parameter pemencaran, yang diamati adalah pertambahan: luas pertumbuhan populasi predator dan pertumbuhan populasi Kutuloncat lamtoro. 4 Drt Data dianalisis dengan formula Percobaan Kemampuaan C. coeruleus menekan populasi Kutuloncat lamtoro dilaksanakan dengan menggunakan tanaman amtoro yang ditanam di dalam kantong plastik dan disungkup dengan kurungan Kutuloncat: Parameter 1 amt oro, kain Каза, diinokulasi dengan kemudian dilepasi larva C yang diamati adalah jumlah telur berhasil menjadi imago. coeruleus Kutuloncat yang
Keyword: Coleoptera, Homoptera

Judul: Demografi Curinus coeruleus Mulsant (Coleoptera : Coccinellidae) Predator kutu loncat lamtoro Heteropsylla cubana Crawford (Homoptera : Psyllidae)
Abstrak: Penelitian ini bertujuan untuk mengetahui demografi dari Curinus coeruleus Mul di laboratorium. Penelitian di lakukan di laboratorium Biologi dan Ekologi Hama, Jurusan Hama dan Penyakit Tumbuhan, Fakultas Pertanian, Institut Pertanian Bogor dan dimulai pada bulan September 1987 sampai dengan Februari 1988. Penelitian dilakukan dengan mengamati perkembangan telur C.coeruelus yang diletakkan pada gelas plastik sebanyak 100 butir telur. Setiap gelas plastik berisi satu butir telur. Pengamatan dilakukan setiap hari sampai serangga dewasa mati. Pemberian makanan dilakukan dengan memberikan telur dan nimfa kutu loncat lamtoro. Hasil pengamatan menunjukkan lama stadium telur adalah 6,45 hari, larva 14,82 hari, prapupa 2,13 hari dan pupa 6,07 hari. Lama hidup imago betina 65,86 hari dan imago jantan 97,64 hari. Laju pertumbuhan reproduksi bersih (R) 189,74, lama generasi (T) 51,00 hari, laju pertumbuhan intrinsik (rm) 0,103, dan potensi berkembangbiaknya (入) 1,108 per hari. Sebaran umur populasi di laboratorium adalah 97,9 persen serangga muda dan 2,1 persen serangga dewasa.
Keyword: 

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
Keyword: