Judul: Karakterisasi Membran Komposit Nilon-Arang Untuk Proses Filtrasi Timbal.
Abstrak: Research about membrane technology that made from nylon thread with extra banana peel kepok charcoal had been done. Membranes had been made from ingredient variation, there are 6.9 g, 6.6 g, 6.5 g, 6.5 g, and 6.5 g nilon thread which added by ingredient of banana peel kepok charcoal in a series are 0.1 g, 0.4 g, 0.5 g, 0.75 g, and 0.25 g. This research had been analyzed about electrical properties, mechanic, and FTIR (Fourier Transform Infra Red) spectrum from membranes that had been made. In addition, the resulting solution filtration tested include density, viscosity, and metal content. Result of this research showed that membrane with ingredient 6.5 g nylon thread added 0.5 g banana peel kepok charcoal is good enough to degradate plumbum in the water. Electrical properties tested by LCR meter showed that the shift curves that prove a change in the electrical properties of the membrane before and after filtration. FTIR tested showed that banana peel charcoal has functional group that are stretching O-H, C=N, C=C, C-N aromatic and C-O. Membrane of nilon thread which added banana peel kepok charcoal has functional group amide and hydrocarbon but both of them are overlap.
Keyword: Bogor Agricultural University (IPB), plumbum, membrane, filtration, Banana peel kepok charcoal

Judul: Filtrasi Air Sungai Menggunakan Membran Nilon dengan Metode Dead-End
Abstrak: On this research nylon membrane be used as filtration media of river water. Filtration did use with deadend method it is a methode position of membran is perpendicular with feed. River water characterized physicly before and after filtration. There are characterizations observed viscosity, turbidity, and density. There are three variant mass of nylon 5, 6 and 6.5 grams. The methode of sintesize membrane is phase inversion. Rejection of 6.5 grams is the biggest it is 69.98% for turbidity rejection, 98.67% for viscosity rejection and 21.06% for density rejection. Membrane was test its strength and morphology used Economic Force Sensor and Scanning Electron Microscopy (SEM) before and after filtration in variant mass. The strength of membrane before filtration is more low than membrane after filtration and the more weight nylon mass the more its strength. The size of pore membrane is 5 micrometre and it’s categorized as microfiltration. There is a fouling in morphology of membrane after filtration and the more weight nylon mass the more tiny its pore
Keyword: Bogor Agricultural University (IPB), river water, nylon, membrane, filtration

Judul: Pengaruh vaksinasi terhadap dinamika populasi pada model SIR (Susceptible-Infected-Recovered)
Abstrak: SIR model can be used to model the spread of diseases in a closed population based on certain assumptions. In this research, the SIR model is formulated by including the factor of vaccination. As the result, the model has been shown to have two equilibrium points, i.e. disease free and endemic equilibrium. A simulation study is carried out to illustrate the model. The results show that some equilibrium points are asymptotically stable. Moreover, a minimum level of vaccination has been defined. For the vaccination level less than the minimum level, increase in the vaccination level results in decrease of the proportion of infected individuals in the corresponding equilibrium point. On the other hand, for the vaccination level greater than the minimum level, increase in the vaccination level results in decrease the proportion of susceptible individuals in the corresponding equilibrium point. Furthermore, when vaccination level is greater than the minimum level, it is found that the time needed for the disease to extinct is shorter.
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