Judul: Karbonisasi Nano Serat Selulosa Asetat dari Kapas yang Dibuat Dengan Metode Electrospinning
Abstrak: Cellulose content of cotton is 94%. The high value cellulose content of cotton makes the extraction cellulose in cotton will be easier. One method to making nano fiber that is electrospinning technique. Electrospinning method can produce nano fibers at a flow rate 1 ml/h, but at flow rate 1.75 ml/h and 2.5 ml/h produce nano spheres based on images of SEM. After carbonized of sample graphite formed, based on XRD data visible from the highest peak in the 2θ is 26.2o which is the typical peak of Graphite Carbon based on the data pattern JCPDS No. 41-1487. EDX results showed that the carbonized result containing 90.10% carbon and 9.9% oxygen. Previously cellulose containing 47.49% Carbon, 48.40% Oxygen and 4.11% gold which was the result of the coating for sample preparation for SEM. While the FTIR results are unreadable due to carbonization change in the sample which makes the previous sample is polar to non-polar. Based on the results generated LCRmeter sample after carbonized is a good conductor.
Keyword: Bogor Agricultural University (IPB), XRD, graphite, FTIR, electrospinning, cotton

Judul: Pembuatan Serat Nano Kitosan/ Polyvinyl Alcohol/ Polyethylene Glycol dengan Metode Electrospinning : Kajian Viskositas Larutan
Abstrak: Metode electrospinning dalam pembuatan serat nano semakin banyak dikembangkan dari waktu ke waktu, karena proses sintesis yang cukup sederhana dan efektif dalam pembuatan serat nano. Sintesis serat nano dengan metode ini dilakukan pada sampel larutan PVA 7.5% dan 10% yang dicampur dengan larutan kitosan dan PEG. Hasil sintesis serat yang dihasilkan dilakukan pengujian mekanik, FTIR, dan SEM. Hasil uji tarik tertinggi didapat pada sampel PVA 7.5% dengan perbandingan konsentrasi PEG+kitosan:PVA 1:9 nilai Ultimate Tensile Strength (UTS) yaitu 8.843 MPa dan pada sampel PVA 10% dengan perbandingan PEG+kitosan:PVA 3:7 nilai Ultimate Tensile Strength yakni 8.85 MPa. Karakterisasi FTIR menujukkan adanya gugus fungsi pada PVA, PEG, dan kitosan. Morfologi serat nano dianalisis dengan menggunakan Scanning Electron Microscope (SEM). Serat yang dihasilkan berada pada rentang skala serat nano yakni mulai dari 60 nm sampai 200 nm.
Keyword: electrospinning, kitosan, PEG, PVA, serat nano, viskositas, electrospinning, kitosan, PEG, PVA, serat nano, viskositas

Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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