Judul: Analisis Model Pandemik dan Prepandemik Avian Influenza pada Populasi Manusia
Abstrak: Avian influenza is a viral disease caused by a virus within the subtype of H5N1 in which its transmission caused by birds or human. In human population, transmission process of avian influenza is discussed in the model called: bird model, prepandemic model and pandemic model. The bird model has two equlibrium points. These are saddle disease free equilibrium and stable endemic equilibrium. The endemic equlibrium occurred when the reproduction number of avian influenza is greater than one. In the endemic equilibrium, avian influenza may infect both bird and human. The prepandemic model has two equilibrium points. These are avian influenza dominant equilibrium and human influenza dominant equilibrium. The human influenza dominant equilibrium occurred when the reproduction number of human influenza is greater than one. The pandemic model has one pandemic equlibrium. The human influenza pandemic occurred when the ratio of human influenza invasion, pandemic invasion and the reproduction number of human influenza is greater than one, respectively. The avian influenza pandemic occurred when the ratio of human influenza invasion, pandemic invasion is less than one and the reproduction number of avian influenza greater than one, respectively.
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Judul: Stability Analysis of the Bilinear Incidence and Half-Saturated Incidence Models in the Avian Influenza Epidemic
Abstrak: Flu burung H5N1 adalah contoh patogen yang diketahui sebagai penyebab terjadinya wabah penyakit pada manusia. Penelitian ini berfokus pada pemilihan strategi pengendalian penyakit flu burung dengan menggunakan Model Insidensi Bilinear (BI) dan Insidensi Setengah Jenuh (HSI). Tujuan penelitian ini adalah merekonstruksi model, menganalisis sifat kestabilan titik tetap dengan menggunakan fungsi Lyapunov, dan melakukan simulasi numerik dengan beberapa perlakuan. Dalam penelitian ini ditunjukkan bahwa parameter yang berpengaruh adalah parameter populasi yang menerapkan perlindungan diri dan efektivitasnya, parameter tingkat isolasi unggas yang terkena flu burung, serta parameter cakupan vaksin dan efektivitasnya. Peningkatan nilai parameter ini dapat menurunkan bilangan reproduksi dasar sehingga kondisi bebas penyakit dapat terjadi. Sehingga pengontrolan dinamika penyebaran penyakit dapat dilakukan dengan meningkatkan nilai parameter tersebut., The H5N1 avian influenza is an example of a pathogen that is known to cause human disease outbreaks. This study focuses on selecting avian influenza control strategies using Bilinear Incidence (BI) and Half-Saturated Incidence (HSI) Models. This study aims to reconstruct the model, analyze the stability of a fixed point using the Lyapunov function, and perform numerical simulations with several treatments. This study shows the parameters that influence are the parameters of the population that apply personal protection and its effectiveness, the parameters of the rate of isolation of birds with avian influenza, and the parameters of vaccine coverage and its effectiveness. Increasing the value of this parameter can reduce the basic reproduction number so that disease-free conditions can occur. Hence, controlling the dynamics of disease spread can be done by increasing the value of these parameters.
Keyword: avian influenza, bilinear incidence, H5N1, half-saturated incidence, Lyapunov function

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4