Judul: Kajian Filtrasi Air Limbah Sungai Ciliwung Mengunakan Membran Selulosa Asetat dan Teflon
Abstrak: On this research would do waste water filtration by using membrane of teflon and cellulose acetate. The method was used is a dead end for teflon and for cellulose acetate membrane method will use dead-end and cross-flow. It also would have done three variations of pressure for each treatment. From the results of research on deadend with PTFE membrane needs to be greater pressure than cellulose acetate. For a dead-end debit highest on PTFE pressure 5.8 psi with a value of 0,604 ml/minute and flux of 0.625 cm/min. For a dead-end with cellulose acetate membrane meliki highest debit on the pressure of 7.5 psi with the value 0.41 ml/minute and fluksnya 0.06 cm/min. whereas cross-flow membrane cellulose acetate produces the highest debit 0.42 ml/min and the highest flux 0.021 cm/min at a pressure of 7.5 psi. for the lowest value of turbidity characteristics possessed by the process of cross-flow at pressure 5 psi with a value of 0.22 NTU. Most neutral acidity was owned by the process deadend with cellulose acetate membrane pressure 2.5 psi. type the lowest value for the masses was a product of cross-flow with a pressure of 5 psi with a value of 1,02606 gr/cm3. Total solids remaining the lowest also owned by the product of cross-flow filtration pressure 5 psi. for the lowest value of viscosity obtained on the process dead-end with teflon membrane on the pressure of 5.8 psi.
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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: The impact and contribution of the tourism sector to the Indonesian economy : an I-O and SAM approach
Abstrak: Tourism is an important and strategic sector for the Indonesian economy. The sector has been growing for the last two decades to enhance its contribution to the GDP, employment, regional, local economy, and to strengthen the balance of payment. In particular, a planned economy was introduced to provide substantial opportunities to utilize tourism as a mechanism for national development. As a service-based sector, tourism as also considered to be a vehicle of converting the manufacturing economy to a service economy which makes the delivery of the product rather than the creation of the product the most important thing.
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