Judul: Dasar-dasar Pemanfaatan Brassicaceae Liar untuk Konservasi Parasitoid Diadegma Semiclausum Hellen (Hymenoptera: Ichneumonidae) dalam Mendukung Pengendalian Hama Terpadu Plutella Xylostella Linn. (Lepidoptera: Yponomeutidae)
Abstrak: Penelitian ini dilaksanakan di Laboratorium Pengendalian Hayati, Jurusan Hama dan Penyakit Tumbuhan, Fakultas Pertanian, Institut Pertanian Bogor dan di Lapangan di Kebun Percobaan Sub Balai Penelitian Hortikultura Segunung, dari Januari 1992 sampai Juli 1993. Pada tanaman kubis, Plutella xylostella Linn. (Lepidoptera: Yponomeutidae) Mama Crociddomia binotalis Zeller (Lepidoptera: Pyralidae) adalah dua hama utama yang merusak, terutama di musim kemarau. Pengendalian P. xylostella selain dan insektisida juga dengan cara biologi dengan menggunakan parasitoid Diarsegma semiclausum Hellen (Hymenoptera: Ichneumonidae)
Keyword: 

Judul: Pemanfaatan makanan oleh larva Plutella xylostella LINN. (Lepidoptera :Yponomeutidae) pada tiga species tumbuhan famili cruciferae
Abstrak: Plutella xylostella Linn. adalah hama penting pada tanaman famili Cruciferae, dan dapat hidup pada beberapa jenis tumbuhan liar famili Cruciferae seperti Nasturtium heterophyllum BL. dan Cardamine hirsuta L. Keberadaan tanaman tersebut berkaitan erat dengan usaha-usaha pengen- dalian yang dilakukan. Pengetahuan tentang fisiologi se- rangga hama adalah salah satu faktor yang sangat menentu- kan dalam usaha pengedalian hama. Pemanfaatan makanan me- rupakan salah satu aspek dari fisiologi hama, yang melipu- ti laju konsumsi, laju pertumbuhan dan efisiensi pemanfa- atan makanan. Tujuan penelitian ini adalah untuk menge- tahui laju konsumsi, laju pertumbuhan dan efisiensi kon- versi makanan larva P. xylostella pada kubis serta tumbu- han liar C. hirsuta dan sawi tanah (N. heterophyllum)...
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: