Judul: Sintesis Nanoselulosa dari Tongkol Jagung dengan Perlakuan Hidrolisis Kimia dan Homogenisasi
Abstrak: Corn cobs has a high potency to be used as a source of raw materials for nanocellulose synthesis.The objective of this research is to synthesize nanocellulose from corn cobs with chemical hydrolysis and homogenization treatment. Alkali treatment,bleaching treatment, acid treatment and homogenization treatment on the corn cobs are effective in the depolymerization and defibrillation of the fibre to produce nanocellulose. This research consists of four main steps those are pre-elliminary research, chemical analysis, synthesize nanocellulose, and final product characterization.Parameters thatwillbe tested aretheconcentration ofNaOH(2%, 4%, and 8%), and the time ofhomogenization (2 hours, 3 hours, and 4 hours). The results show that the concentration of NaOH affect the level of cellulose and lignin final product.The bestconcentration ofNaOH needed to isolatecelluloseis 2%. Futhermore, the concentration of NaOH also affected the color and suspension of the final product. Final product with 8% NaOH treatment had the brightest color and the most stable suspension, while the homogenization time did not affect the colorand can not be seen the effect to the suspension formation of the final product . ScanningElectronMicrocope(SEM) results showed thatthechemical hydrolysis and mechanical treatmenthad successfully isolated thecelluloseandits sizehad reachedbelow 100nm, but stillin small amounts. Cellulose that was observed withSEM had an averagesize of80-270nmdiameter.
Keyword: 

Judul: Produksi Nanoselulosa dari Limbah Padat Pengolahan Agar melalui Metode Hidrolisis Asam dengan Akselerasi Gelombang Ultrasonik.
Abstrak: Nanoselulosa merupakan nanomaterial multifungsi yang dapat diaplikasikan pada berbagai bidang. Salah satu sumber potensial nanoselulosa adalah limbah padat agar yang mengandung selulosa tinggi dan rendah lignin. Produksi nanoselulosa melalui hidrolisis asam dengan akselerasi gelombang ultrasonik menarik dilakukan karena dapat mereduksi durasi hidrolisis. Penelitian ini bertujuan untuk memproduksi dan karakterisasi nanoselulosa dari limbah padat agar melalui hidrolisis asam dengan akselerasi gelombang ultrasonik berdasarkan durasi hidrolisis berbeda. Penelitian ini meliputi karakterisasi dan preparasi limbah agar, ekstraksi selulosa, dan hidrolisis nanoselulosa yang dilakukan pada durasi hidrolisis 30, 60, dan 120 menit. Karakteristik nanoselulosa memiliki mikrostruktur permukaan dengan bentuk beragam, ukuran partikel antara 24.91-28.87 nm, dan ukuran kristal 0.71-3.57 nm. Perlakuan durasi waktu hidrolisis 60 menit memberikan nilai derajat putih terbaik dengan nilai 87.26% serta menghasilkan rendemen 76.19% dan derajat kristalinitas 35.08%.
Keyword: acid hydrolysis, agar, nanocellulose, ultrasonication

Judul: Implementation of Spatio-Temporal Change Query in Relational Database.
Abstrak: Geographic object changes in various views. Object changes are recorded using a model of static storage. No historical connection between old version data and new version data has been built. For that, a storage model of spatio-temporal queries that can analyze spatio-temporal changes has been developed. The object changes the geometry are grouped according to the taxonomy of Spatio-Temporal Pattern Change. This research has been able to apply the query patterns change including born, expand, merge, contract, split, normal and die. This query based on geometric (area) changes. The implementation of spatio-temporal change queries represents an object changes continuously with easy, change detection is done by comparing two versions of data. Keyword: spatio-temporal change query, spatio-temporal change pattern.
Keyword: