Judul: Pembuatan Strip Tes Berbasis Hemisianin sebagai Kemosensor Ion Hg(II)
Abstrak: Strip tes merupakan temuan yang memiliki aplikasi dalam pendeteksian suatu ion logam maupun pengujian hayati yang menjanjikan aplikasi teknologi yang bersifat murah dan pembuatan yang sederhana. Pembuatan piranti dilakukan dengan menggunakan metode batik tulis tradisional dengan menaruhkan lilin yang dipanaskan selama lebih dari 20 menit pada bagian permukaan kertas. Pembuatan strip tes dilakukan dengan imobilisasi 10 μL reagen hemisianin pada daerah sensor. Bahan dasar pembuatan strip tes adalah kertas WhatmanTM no. 41 dengan ukuran lebar saluran 0.5 cm dan diameter daerah deteksi 1.5 cm. Aplikasi strip tes sebagai kemosensor ion Hg(II) memiliki waktu respon piranti pada menit ke-24 dengan waktu total uji selama 24 menit 38 detik untuk setiap pengujian; linearitas pada rentang konsentrasi sampel larutan Hg dari 100 ppm sampai 250 ppm menunjukkan nilai koefisien kolerasi 0.9850. Strip tes memiliki sensitivitas 0.3216 Δmean RGB/ppm; dengan nilai batas deteksi 41.4767 ppm dan batas kuantifikasi 138.2556 ppm.
Keyword: chemosensor, hemisianin, ion Hg(II), test strip, batik tulis

Judul: Pembuatan Visual Strip Sensors Ion Besi(II)  dengan Bahan Pendukung Kertas yang Dilapisi Poliakrilamida
Abstrak: Penelitian ini bertujuan membuat visual strip sensors untuk mengukur kadar besi. Sensor ini dibuat dari kertas selulosa asetat yang telah dilapisi oleh poliakrilamida dan disisipi pengompleks 1,10-fenantrolin. Pengujian visual strip sensors dilakukan pada berbagai konsentrasi Fe2+ dengan membuat deret standar dan melihat kisaran konsentrasi Fe2+ yang dapat terbedakan oleh mata. Sensor yang telah diuji kemudian diamati kestabilan warnanya selama 4 hari. Visual strip sensors mampu membedakan dengan kisaran 5 ppm dan sedikit terjadi peningkatan intensitas warna setelah diamati selama 4 hari. Pengukuran sampel obat penambah darah dengan 3 kali ulangan menghasilkan keterulangan yang baik. Dari hasil pengukuran visual strip sensors dibandingkan dengan spektrometri serapan atom diperoleh ketepatan 99.42%.
Keyword: Colorymetry, Complex, Visual strip sensors, Kolorimetri, Pengompleks, Kestabilan warna, Pengukuran kadar besi, Pengaruh ion

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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