Judul: Model Tertutup Sistem Produksi Mandiri Energi pada Industri Tepung Jagung
Abstrak: Industri tepung jagung menggunakan energi dalam jumlah yang besar untuk memproduksi tepung jagung. Pemenuhan kebutuhan energi ini masih dipenuhi oleh sumber energi yang tidak terbarukan dan terbatas persediaanya sehingga dapat mempengaruhi kegiatan produksi dikemudian hari. Selain itu, dalam kegiatan produksi tepung jagung dihasilkan limbah. Hasil samping dari proses produksi tepung jagung dapat dimanfaatkan sebagai energi alternatif yang berkelanjutan. Tujuan penelitian ini adalah mengembangkan model kesetimbangan massa dan energi industri tepung jagung mandiri energi sehingga dapat meminimumkan ketergantungan terhadap energi fosil. Hasil penelitian ini diharapkan dapat dijadikan rujukan dalam pengembangan industri tepung jagung yang mandiri energi atau lebih hemat energi. Model sistem tertutup dibuat mulai dari yang paling sederhana sampai yang lebih kompleks. Model kesetimbangan massa dilakukan berdasarkan pada proses produksi tepung jagung. Pengembangan model dilakukan hingga diperoleh model yang paling sesuai menggambarkan situasi aktual proses produksi tepung jagung. Dari hasil pemodelan diperoleh rendemen tepung jagung sebesar 31% pada level 3. Limbah jagung berupa tongkol, dan kulit jagung dapat dimanfaatkan sebagai biomassa sumber energi sebesar 3869,8 kWh dengan cara pembakaran dengan Boiler FBC dengan efisiensi sebesar 68% sehingga industri tepung jagung dapat mandiri energi.
Keyword: Tepung jagung, sistem tertutup, industri mandiri energi

Judul: Model Sistem Tertutup untuk Pengembangan Industri Penggilingan Padi Mandiri Energi.
Abstrak: Rice mills consumed a lot of energy. The fossil fuel has been the main source of energy which availability is declining, and in addition the use of it caused negative impact on the environment. A more sustainable energy resource, such as biomass should be considered to replace fossil energy. This research was aimed to develop a model of a self-sufficiency rice mill by converting by-products into energy. The model is based on principle of mass balance by assuming linear equation in each compartment. The simplest model assumed the rice mill as a single compartment, the level II model assumed main process as compartment, and the complex model used a more detailed step of processes as compartment. The complex model was chosen to be the most suitable model to represent actual process of rice mill. According to this model, head rice yield, rice husk ratio, and bran ratio obtained is 0.572; 0.231, and 0.074 of dried paddy respectively. Energy potential of by-product conversion is 18,827 MJ/day from processing 20 tons paddy. This energy potential exceeded the need with surplus of 28.25%. This research revealed that rice mills can be energy self-sufficient. Therefore, it is possible to limit fossil fuel energy used in rice mill.
Keyword: rice mill, closed production system, self-sufficient energy industry

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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