Judul: Pendugaan Serapan Karbon Dioksida Pada Blok Rehabilitasi ConocoPhillips di Hutan Pendidikan Gunung Walat, Sukabumi.
Abstrak: Hutan memiliki peranan penting dalam upaya mengurangi emisi gas rumah kaca. Hutan mampu menyerap karbon dioksida dari atmosfer melalui proses fotosintesis dan menyimpannya dalam bentuk biomassa. Penelitian ini bertujuan menduga potensi serapan karbon dioksida pada blok rehabilitasi ConocoPhillips seluas 11.03 ha dalam rangka monitoring dan evaluasi tahunan pelaksanaan program rehabilitasi hutan yang dilaksanakan Hutan Pendidikan Gunung Walat bekerjasama dengan ConocoPhillips Indonesia Inc. Ltd. Penelitian dilakukan menggunakan metode penarikan contoh sistematis berlapis berdasarkan tahun tanam dengan intensitas contoh sebesar 15%. Pengambilan data dilakukan dengan mengukur diameter dan tinggi pohon pada plot contoh berbentuk lingkaran seluas 0.02 ha. Hasil penelitian menunjukan nilai dugaan serapan karbon dioksida total populasi pada tahun 2014 sebesar 9.88 ton dengan kesalahan penarikan contoh sebesar 26.67%. Nilai tersebut lebih rendah dibandingkan hasil pengukuran tahun 2013, yaitu 15.57 ton, yang diakibatkan oleh berbagai faktor.
Keyword: penarikan contoh sistematis berlapis, rehabilitasi hutan, serapan karbon

Judul: Pendugaan Cadangan Karbon Tanaman Rehabilitasi Hutan ConocoPhillips di Hutan Pendidikan Gunung Walat, Sukabumi, Jawa Barat.
Abstrak: Sejak tahun 2009 Hutan Pendidikan Gunung Walat (HPGW) melakukan kerjasama dengan ConocoPhillips Indonesia untuk meningkatkan cadangan karbon dengan melakukan kegiatan rehabilitasi hutan. Oleh karena itu, dilakukanlah penelitian ini yang bertujuan untuk mengetahui cadangan karbon pada blok rehabilitasi ConocoPhillips. Pendugaan cadangan karbon pada penelitian ini menggunakan metode stratified systemtic sampling with random start dengan intensitas sampling sebesar 16%, luas plot lingkaran 0,04 ha, dan plot contoh sebanyak 46 plot. Data yang digunakan pada penelitian ini adalah data diameter (dbh dan pangkal) dan tinggi total pohon. Dari data tersebut akan didapatkan nilai dugaan cadangan karbon serta nilai dugaan serapan karbon dioksida. Hasil pengukuran ini menunjukkan nilai dugaan cadangan karbon sebesar 19,83 ton, sehingga dapat menyerap karbon dioksida sebanyak 72,78 ton dengan kesalahan penarikan contoh sebesar 39,39%. Nilai dugaan cadangan karbon tahun 2016 mengalami peningkatan dari tahun sebelumnya yang bernilai sebesar 11,41 ton pada pengukuran tahun 2015 dan 2,69 ton pada pengukuran tahun 2014.
Keyword: serapan karbon dioksida, cadangan karbon, ConocoPhillips, rehabilitasi hutan

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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