Judul: Effects of Sodium Citrate Concentration and Dryer Type on Characteristics of Instant Rice
Abstrak: Nasi instan memiliki pasar yang spesifik dan cukup menjanjikan bagi industri skala kecil. Pembuatan nasi instan yang ideal menggunakan teknologi pengeringan beku, dimana teknologi tersebut terlalu mahal bagi industri kecil. Penelitian ini bertujuan menentukan pengaruh konsentrasi natrium sitrat dan tipe pengering terhadap karakteristik fisikokimia dan organoleptik nasi instan yang dihasilkan. Penelitian dilakukan menggunakan Rancangan Acak Lengkap dengan 2 perlakuan yaitu konsentrasi larutan natrium sitrat dengan 3 taraf (1 %, 2%, dan 3%) dan tipe pengering dengan 2 taraf (fluidized bed dan tray). Hasil uji fisikokima dan organoleptik terhadap nasi instan menunjukkan bahwa perendaman dengan konsentrasi larutan natrium sitrat 5% dan pengering fluidized bed adalah perlakuan terbaik. Nasi instan yang dihasilkan memiliki karakteristik: rendemen 77,53%, densitas kamba 0,41 gram/ml, waktu rehidrasi 4,67 menit, daya serap air 54,43%, rasio rehidrasi 3,50, volume pengembangan 173,33%, kekerasan 891,33 gram, derajat putih 65,61, kadar air 10,65%, abu 0,40%, protein 8,97%, lemak 3,47%, karbohidrat 87,16% dengan skor penerimaan keseluruhan netral.
Keyword: fisikokimia, nasi instan, natrium sitrat, organoleptik, pengering

Judul: Pengaruh Pengeringan Terhadap Mutu Nasi Uduk Instan
Abstrak: Rice is the staple food for most of Indonesian. The production of rice increases every years. In 2010, the production of rice was about 65,98 billion ton,while consumtion of rice is 139,5 kg/capital/ year. Based on these data, the development of rice product is a potential market. Nowadays many people do not have much time to prepare their food. Instant food is commonly choosed by the modern people. Quick cooking rice methods have been commonly used since 1970, but their products are not popular in Indonesia. The purpose of this research is to produce a quick cooking rice with special taste native to West Sumaterae, called “nasi uduk”. The preparation involves soaking, cooking (gelatinizing) and drying using fluidized bed dryer.This research was focused on to find out the optimum drying conditions or treatment to produce the good quality of quick cooking rice. This research used three different drying treatments, namely A,B, and C treatment which were based on combination of time and temperature history. It was found that the optimum of drying method was the A tratment. In the A treatment, the rice was freezed for 24 hours at -20°C. After that, rice was dried for 30 minutes at room temperature and then increased the temperature strart from 40°C, 60°C, and 80°C for 10 minutes in each temperature. This method resulted in a good acceptance from panelists.
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Judul: Pelabelan Super Vertex Magic
Abstrak: Super vertex magic labeling is labeling on graph with is a set of edges mapped into and is a set of vertices mapped into . It has a vertex magic labeling in which and represents the size and order of the graph respectively. This manuscript proves that paths, cyclics, and disjoint union of cyclics have a super vertex magic labeling. There are four theorems to be discussed. The first theorem proves that path is super vertex magic if and only if is odd and . The second theorem proves that cyclic is super vertex magic if and only if is odd. The third theorem proves that bijection function from an edge set onto of graph can be extended to a super vertex magic labeling if and only if the set amount of edge label that incidents with a vertex in the graph, consists of sequential integers as many as vertices in the graph. The fourth theorem proves that disjoint union of the cyclics consists of cyclics with each cyclic has vertices is super vertex magic if and only if and are odd.
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