Judul: Model Matematika Penyebaran Penyakit Demam Berdarah Dengue Tipe SIR.
Abstrak: Penyakit DBD merupakan penyakit yang disebakan oleh virus dengue yang melibatkan nyamuk Aedes aegypti. Virus dengue ini memiliki empat jenis serotipe, yaitu Den 1, Den 2, Den 3, dan Den 4. Populasi manusia dibagi menjadi tiga subpopulasi, yaitu manusia rentan ... dst
Keyword: titik tetap endemik, analisis kestabilan, bilangan reproduksi dasar, simulasi numerik, DBD, titik tetap tanpa penyakit

Judul: Analisis Kestabilan dan Kepekaan Parameter Model Penyebaran Penyakit Demam Berdarah Dengue Tipe SEIR
Abstrak: Demam Berdarah Dengue (DBD) merupakan suatu penyakit menular yang disebabkan oleh virus dengue. Penyakit ini ditularkan nyamuk Aedes Aegypti. Dalam tugas akhir ini populasi manusia dikelompokkan dalam empat kompartemen, yakni: rentan (S), terpapar (E), terinfeksi (I) dan sembuh (R). Sementara populasi nyamuk dikelompokkan dalam tiga kompartemen, yakni: rentan (S), terpapar (E) dan terinfeksi (I). Interaksi antar kompartemen dituliskan dalam suatu sistem persamaan diferensial. Model ini menghasilkan dua titik tetap, yaitu titik tetap tanpa penyakit dan titik tetap endemik. Analisis kestabilan bagi titik tetap tersebut ditentukan menggunakan kriteria Routh-Hurwitz. Berdasarkan hasil analisis diperoleh bahwa, jika , maka titik tetap endemik tidak stabil sementara titik tetap bebas penyakit stabil. Pada bagian akhir dilakukan analisis kepekaan parameter dengan menggunakan software Wolfram Mathematica, dan didapat bahwa parameter laju kematian nyamuk merupakan parameter yang paling peka.
Keyword: DHF, Parameter Sensitivity, Routh-Hurwitz, SEIR

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