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 Potensi Serapan Karbon di Areal Rehabilitasi Hutan Pendidikan Gunung Walat
Abstrak: Hutan Pendidikan Gunung Walat (HPGW) bekerjasama dengan TOSO Company dan ConocoPhillips Indonesia memiliki program voluntary carbon projects dalam rangka meningkatkan cadangan karbon sejak tahun 2009. Penelitian ini bertujuan untuk menduga potensi serapan karbon dioksida (CO2) di areal rehabilitasi HPGW di blok ConocoPhillips dan TOSO. Teknik pengambilan contoh menggunakan metode stratified systematic sampling with random start dengan intensitas sampling 5,25% dengan plot lingkaran (luas 0.02 ha) berjumlah 77 plot. Pada setiap plot contoh dilakukan pengukuran diameter dan tinggi pohon untuk menghitung biomassa, cadangan karbon, dan serapan CO2. Data serapan CO2 pada setiap plot contoh selanjutnya digunakan untuk menduga potensi serapan CO2 pada tiap stratum dan populasinya. Hasil penelitian menunjukkan bahwa total potensi serapan CO2 pada tahun 2015 di blok ConocoPhillips sebesar 42.50 ton dengan kesalahan penarikan contoh sebesar 28.70% sedangkan di blok TOSO sebesar 50.59 ton dengan kesalahan penarikan contoh sebesar 30%. Potensi serapan CO2 tersebut mengalami peningkatan sebesar 32.62 ton untuk blok ConocoPhillips dan 31.56 ton untuk blok TOSO jika dibandingkan dengan potensi pada tahun 2014.
Keyword: Toso Area, sequestration, GWEF

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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