Judul: Study on recirculation dryer of rough rice using Pneumatic Conveyor and blanded kerosene and jatropha curcas oil
Abstrak: Post harvest losses of rice in Indonesia was estimated to reach 20 % in which drying alone accounted for 2.3%. Most farmers in this country use the traditional direct sun drying, although cheap in cost it has the demerit of being dependent on weather conditions, susceptible to damage by rodent and easy being contaminated with dusts and foreign materials which can reduce the quality of products. Any delay in drying due to bad weather conditions will lead to excess in respiration and fungal growth, and sprouting due to re-wetting of products causing great losses in rice quality. The effect of global warming, due to accumulated green house gas (GHG) emissions in our atmosphere has created global climate change and uncertainty in weather conditions. Rainy days may occur during golden harvest making sun drying impossible and consequently drying should be delayed. The use of artificial dryer is facing another problem where fossil fuel as source of hot air generation is becoming scarce and high price. The aim of this study was to design a recirculation dryer of rough rice using pneumatic conveyor and blended fuel between kerosene and jatropha curcas oil to generate hot air for drying. This study comprises of five major components. First, is the study about the feasibility of using jatropha curcas oil as an energy source to produce drying air, second, experiments related to the influence of drying time and tempering durations on head rice yield (HRY) under non-flow static grain conditions, third, performance test of the proposed recirculation dryer, fourth computer simulation on recirculation dryer of rough rice using pneumatic conveyor and lastly, economic benefit of the proposed drying system.
Keyword: Recirculation dryer, Pneumatik conveyor, Head rice yield

Judul: Pengaruh Pengeringan Terhadap Rendemen Minyak Jarak Pagar (Jatropha curcas L.)
Abstrak: Drying is a process of reducing the moisture content of the ingredients until a certain moisture content. One of the ingredients that require drying process to preserve its quality is of jatropha seeds. The purpose of drying jatropha seed is to higher produce the most yield. This research to study of drying effect conditions on oil yield of jatropha seeds and finding the proper drying conditions for jatropha seeds. The ingredients used are seeds obtained from jatropha plantation Pakuwon, Sukabumi. This drying process is done by using sunlight and accutition drying machine. Drying using a accutition drying machine by treatment of T = 60 oC, RH = 20%; T = 60 °C, RH = 40%; T = 80 °C, RH = 20%, and T = 60 °C, RH = 40%. The results suggest that the lower of moisture content of jatropha seeds, the higher the yield of oil produced. The greatest yield of oil produced by the dryer berakuisisi at T = 80oC and RH = 20%, while the lowest oil yield occurred in treatments with accutition drying machine at T = 60oC and RH = 40%. Henderson & Pabis model can describe the characteristics of dying with the jatropha seed drying than Lewis's model where the correlation coefficient (r) ranged from 0990 until 0999.
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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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