Judul: Analisis Model Asimtomatik Penyebaran Penyakit Demam Berdarah Dengue
Abstrak: Demam Berdarah Dengue adalah penyakit yang disebabkan oleh gigitan nyamuk Aedes aegypti dan Aedes albopictus . Penyakit ini memiliki empat jenis virus yaitu DEN-1, DEN-2, DEN-3, dan DEN-4. Individu yang terinfeksi memiliki gejala yang berbeda-beda bahkan ada yang tidak menunjukkan gejala atau asimtomatik. Karya ilmiah ini membahas model penyebaran penyakit dengan adanya pengaruh asimtomatik pada suatu populasi manusia yang tertutup. Berdasarkan analisis terdapat dua titik tetap yaitu titik tetap bebas penyakit dan titik tetap endemik. Untuk menentukan nilai parameter yang mempengaruhi penanggulangan penyebaran penyakit DBD, dilakukan analisis sensitivitas dan simulasi numerik. dst..., engue Fever is a disease caused by the bite of the Aedes aegypti and Aedes albopictus mosquito. This disease has four types of viruses namely DEN-1, DEN-2, DEN-3, and DEN-4. Infected individuals have different symptoms and some even show no symptoms or asymptomatic. This scientific work discusses the model of the spread of disease with an asymptomatic influence on a closed human population. Based on the analysis there are two fixed points, namely the fixed point free of disease and the endemic fixed point. To determine the value of parameters that affect the prevention of the spread of dengue disease, sensitivity analysis and numerical simulations are carried out. etc ...
Keyword: SIR type, dengue fever, basic reproduction number, sensitivity analysis

Judul: Sensitivity Analysis of SI1I2RS Model for Dengue Fever Transmission
Abstrak: Karya ilmiah ini membahas mengenai pemodelan matematika penyebaran penyakt dengan memodifikasi model penyebaran penyakit demam berdarah melibatkan adanya kompartemen populasi terinfeksi gejala ringan dan disebut model SI1I2RS. Berdasarkan model matematika ini diperoleh dua titik tetap yaitu titik tetap bebas penyakit dan titik tetap endemik penyakit. Selain itu, diperoleh pula bilangan reproduksi dasar (ℛ0) yang hanya bergantung pada parameter parameter dari model. Sifat dinamik dari model matematika yang diperoleh menunjukkan bahwa titik tetap bebas penyakit bersifat stabil asimtotik lokal bila ℛ0 < 1 dan titik tetap endemik penyakit bersifat stabil asimtotik lokal bila ℛ0 > 1. Dalam karya ilmiah ini, analisis sensitivitas dilakukan untuk mengetahui parameter model yang paling berpengaruh pada perubahan nilai reproduksi dasar (ℛ0). Berdasarkan data epidemik yang digunakan dalam penelitian ini diperoleh bahwa parameter rata-rata gigitan nyamuk pada manusia memiliki nilai sensitifitas yang paling tinggi. Simulasi numerik menunjukkan bahwa penurunan rata-rata gigitan nyamuk pada manusia menyebabkan penurunan nilai bilangan reproduksi dasar. Penurunan rata-rata gigitan nyamuk pada manusia hingga sekitar 8% menyebabkan penurunan bilangan reproduksi dasar mencapai kurang dari satu. Hal ini menunjukkan bahwa tidak ada lagi dalam waktu 60 hari penyebaran penyakit demam berdarah. Parameter lain yang juga mempengaruhi nilai bilangan reproduksi dasar yang menjadi perhatian dalam penelitian ini adalah laju transmisi penyakit dari nyamuk terinfeksi ke manusia rentan. Berdasarkan simulasi numerik diperoleh bahwa penurunan laju transmisi penyakit dari nyamuk terinfeksi ke manusia rentan hingga sekitar 2,5% menyebabkan penurunan bilangan reproduksi dasar mencapai kurang dari satu., This thesis considers the mathematical modeling of the spread of disease by modifying the model of the spread of dengue fever involving the presence of population compartments infected with mild symptoms. It is called the SI1I2RS model. Based on this mathematical model, two equilibrium points are obtained: the disease-free equilibrium point and the disease-endemic equilibrium point. The basic reproduction number (ℛ0) is also brought, which only depends on the model's parameters. The dynamic nature of the obtained mathematical model shows that the disease-free equilibrium point is locally asymptotically stable if ℛ0 < 1, and the disease-endemic equilibrium point is locally asymptotically stable if ℛ0 > 1. In this thesis, a sensitivity analysis was carried out to determine the model parameters that influence changes in the basic reproduction value (ℛ0). Based on the epidemic data used in this research, it was found that the average parameter for mosquito bites in humans had the highest sensitivity value. Numerical simulations show that a decrease in the average number of mosquito bites in humans causes a decrease in the value of the basic reproduction number. The reduction in the average mosquito bite rate in humans by around 8% has decreased the basic reproductive number to less than one. This shows no further spread of dengue fever within 60 days. Another parameter that influences the value of the basic reproduction number, which is of concern in this research, is the rate of disease transmission from infected mosquitoes to susceptible humans. Based on numerical simulations, it was found that reducing the rate of disease transmission from infected mosquitoes to susceptible humans by around 2.5% resulted in a decrease in the
Keyword: Dengue Fever, Endemic, SI1I2RS model, Sensitivity analysis

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