Judul: Pengembangan proses ekstraksi gambir (Uncaria gambir)
Abstrak: Tujuan dari penelitian ini adalah untuk mendapatkan gambaran lebih jelas mengenai imdustri pengolahan gambir secara tradisional, serta mengambangkan proses industri yang lebih baik berdasarkan proses tradisional tersebut. Pengolahan gambir tradisional di Sumatera Barat khususnya di Tanjung Balit, masih sangat sederhana dan cara kerjanya tidak nyaman. Produktivitas pengolahannya kecil, walaupun mutunya baik. Proses ekstraksi mekanis dengan penirisan pada suhu ruang menghasilkan gambir dengan karakteristik terbaik, jika dibandingkan dengan proses ekstraksi menggunakan pelarutan. Proses ekstraksi mekanis merupakan pengembangan dari proses tradisional yang dilaksanakan di Tanjung Balit, Sumatera Barat. Perbaikan mutu gambir dapat dilaksanakan di Indonesia, dengan teknologi yang dapat dikembang- kan di Indonesia.
Keyword: Ekstraksi gambir, Uncaria gambir

Judul: Studi pemanfaatan gambir (Uncaria gambir Roxb) dalam proses pewarnaan kain mori
Abstrak: Gambier is an extract of leaves and branches of gambier plant (Uncaria gambier Roxb). Gambier is one of Indonesia export commodities mostly produced in Sumatera island. Indonesia plays role as the world’s largest gambier exporter. In Indonesia, gambier utilized traditionally as leather tanning material, ingredient of traditional medicine, rust omission, etc. Chemical components of gambier mostly utilized are catechin and tannin. Technology of gambier processing that existed in Indonesia is still low in capacity, so the processing of gambier is mostly done traditionally. This kind of processing resulted on low quality and lack of economical value products of gambier. Therefore, development of processing method and wide utilization of Gambier in industry are needed to increase gambier added value. Tannin and catechin on gambier also can be utilized as colouring agent in textile industry to gain reddish brown colour on batik clothes that will be endure on intense sunlight exposure. Textile industries in Indonesia, especially batik industries, are now developing rapidly where the trend of batik clothes on every occasion is becoming common interest. On technological side, in general the batik industrialists have not done any development on their production sytem and method, so they could be more productive and produce uniformity of product quality. Utilization of natural colouring agent is also not becoming a consideration of most batik industrialists in the environmental issue that is now being widely concerned.
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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