Judul: Sintesis dan Karakteristik Membran Nilon yang Berasal dari Limbah Benang
Abstrak: Teknologi membran saat ini terus mengalami kemajuan. Banyak hal menarik yang dapat dipelajari dari membran ini, sehingga banyak ide-ide bermunculan dalam segi pembuatan membran sintesis dari berbagai bahan, yang selanjutnya dapat digunakan atau dapat menggantikan fungsi membran alami. Tujuan penelitian ini yaitu untuk mengetahui dan mempelajari pengaruh penambahan TiO2 terhadap kandungan senyawa yang terdapat pada benang nilon pasaran dan terhadap sifat listrik maupun mekaniknya. Pembuatan membran dilakukan dengan metode inversi fase dengan berbagai variasi bobot. Karakterisasi yang dilakukan meliputi: sifat listrik (impedansi, kapasitansi, konduktansi dan loss coefficient), sifat mekanik (kuat tekan dan kuat tarik) dan analisis senyawa membran nilon dengan FTIR. Membran yang memiliki sifat mekanik yang paling baik diperoleh pada membran dengan bobot nilon 3,5 g dan 6,0 g, yang selanjutnya dari hasil mekanik ini dilakukan pendadahan TiO2. Senyawa yang terkandung pada membran nilon yang diamati menggunakan FTIR memperlihatkan terdapat PO4 baik pada membran murni maupun pada membran yang sudah didadah TiO2.
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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: Penyelesaian Stacker Crane Problem dengan Algoritme Largearcs dan Smallarcs
Abstrak: In graph theory, the Rural Postman Problem (RPP) aims to determine the shortest route with minimum cost, in which only certain edges or arcs are necessarily traversed. One type of RPP is Stacker Crane Problem (SCP) which deals with a mixed graph but only arcs are necessarily traversed. SCP can be solved by using two heuristic algorithms, i.e. Largearcs and Smallarcs algorithms, which include other algorithms in their steps, such as: Dijkstra algorithm to determine shortest route, Hungaria method to determine minimum bipartite matching, Prim algorithm to determine minimum spanning tree, and van Aardenne-Ehrenfest & de-Bruijn algorithm and Fleury algorithm to determine Euler circuits. The shortest Euler circuit resulted from two heuristic algorithms can be used to find a solution of SCP. The application of SCP is illustrated in establishing the minimum distance route of catering delivery.
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