Judul: Pendugaan Parameter Model Dinamik dengan Metode Median Absolute Deviation dan Bisquare M-Estimation
Abstrak: Metode Least Square (LS) merupakan salah satu metode pendugaan parameter yang mudah terpengaruh terhadap kehadiran pencilan. Oleh karena itu diperlukan metode alternatif yang tahan terhadap kehadiran pencilan, yaitu metode robust. Metode robust yang digunakan pada karya ilmiah ini adalah metode Median Absolute Deviation (MAD) dan Bisquare M-Estimation. Parameter yang diduga yaitu parameter model tunggal dinamik Gompertz dan parameter model sistem dinamik SEIV (Susceptible - Exposed - Infected - Vaccinated) dengan data hipotetik yang dibangkitkan melalui software Wolfram Mathematica 10. Nilai SMAPE (Symmetrical Mean Absolute Percentage Error) digunakan untuk mengukur keakuratan pendugaan parameter. Metode Bisquare M-Estimation relatif lebih baik dari metode LS dan MAD pada data dengan pencilan. Ketiga metode dapat diterapkan pada data tanpa pencilan.
Keyword: data tanpa pencilan, Data hipotetetik, model epidemi SEIV

Judul: Pendugaan Parameter Model Dinamik Dengan Metode Median Absolute Deviation Dan Bisquare M-Estimation
Abstrak: Metode Least Square (LS) merupakan salah satu metode pendugaan parameter yang mudah terpengaruh terhadap kehadiran pencilan. Oleh karena itu diperlukan metode alternatif yang tahan terhadap kehadiran pencilan, yaitu metode robust. Metode robust yang digunakan pada karya ilmiah ini adalah metode Median Absolute Deviation (MAD) dan Bisquare M-Estimation. Parameter yang diduga yaitu parameter model tunggal dinamik Gompertz dan parameter model sistem dinamik SEIV (Susceptible - Exposed - Infected - Vaccinated) dengan data hipotetik yang dibangkitkan melalui software Wolfram Mathematica 10. Nilai SMAPE (Symmetrical Mean Absolute Percentage Error) digunakan untuk mengukur keakuratan pendugaan parameter. Metode Bisquare M-Estimation relatif lebih baik dari metode LS dan MAD pada data dengan pencilan. Ketiga metode dapat diterapkan pada data tanpa pencilan.
Keyword: Bogor Agricultural University, aInstitut Pertanian Bogor, IPB, Model dinamik, Median Absolute Deviation, Bisquare M-Estimation, Last square, Pencilan, Model gompertz, Model SEIV

Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell