Judul: Mesin Pencari untuk Sistem Kearsipan Daerah Kabupaten Sragen
Abstrak: Sragen district archives system is the system that used to store archived data. In this archives system, the searching is based on data or a summary disposition from the archives. Because this search result is limited, this research makes search engine for regional archives system that is based on the contents of digital archives, especially Microsoft Word. This search engine is using vector space model for weighting and cosine similarity. Stemmer used in this research is stemmer based on KBBI. Evaluation is using recall and precision of queries that has been determined. The calculation of average precision (AVP) is done because of some queries are used in this evaluation. AVP measuring is calculatd based on 11 standard recall levels. Evaluation result from the search engine is relevant documents that appropriate with the sequence relevance. The value of average precision got from 10 queries is 0.896, scale from 0 to 1. The precision of the search engine performance is affected by the stemmer. Stemmer KBBI creates smaller index size, but it decreases the precision. Stemmer KBBI decreases the precision, because of search by using basic words .
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Judul: Ekspansi Kueri Menggunakan Metode Semantic Similarity Retrieval Model (SSRM)
Abstrak: The main objective of this study was to applied the method of semantic similarity in the proccesed of query expansion in information retrieval systems in the Indonesian language. Selection of partners in selecting candidates expansion will be used phrase pairs that have been made In research Kartina (2010) in which the phrase pairs with the largest value of similarity between the words that will be selected. Used by 10 groups of queries not clear who obtained manually and 30 groups of queries in 2000 agricultural document, document search results will be compared with the addition one-term of expansion, two-term of expansion, and three-term of expansion. The results of this study suggest five things. The first that the expansion of the query by added one term produces better results than the addition of two terms and three terms. The second that query expansion used by 10 groups of queries produces a higher precision values than using 30 groups of queries. The third that the used of the semantic similarity method produces better performance than the use of a thesaurus on the method of similarity retrieval Vektor Space Model (VSM). The fourth that the used of semantic similarity methods have not been able to produce better performance than the used of the method of conditional probabilities in the selection of expansion terms resulting from the translation of bilingual dictionary. The fifth that the used of the phrase paired in determining the candidate expansion terms can not maximize the search results using the method of semantic similarity of documents, because each pair selected does not necessarily have a semantic relationship with a given query.
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Judul: Mercury Toxicity and It’s Effect on Histopathology Change of Nile Tilapia (Oreochromis niloticus).
Abstrak: Nile tilapia (Oreochromis niloticus) is one of fish species that oportunity to contaminated with mercury. The effects of pollutants can damage living organisms organs and can cause death. The effects caused mercury had acute or chronic character. The aims of this study are to determine threshold and acute toxicity of mercury chloride (HgCl2) of Nile tilapia (Oreochromis niloticus), to assess the effect of mercury chloride (HgCl2) on several biometric parameters (survival, growth rate of average daily weighted, liver condition, bile and reproductive variability of Nile tilapia (Oreochromis niloticus), assess the level of damage to the histological structure of the gills, liver and kidney of Nile tilapia (Oreochromis niloticus) caused mercury chloride (HgCl2) exposure. This study was conducted from February to June 2013. Nile Tilapia (Oreochromis niloticus) were used in this study were female with average weight 20 grams or 11-13 cm length range. Toxicant materials used in this study was mercury chloride (HgCl2). Fish were reared in each aquarium 60x40x30 containing 48 liters of water. This study consists of three stages: a preliminary test, acute test, and sub-chronic test. To determine the changes in biometric condition of tilapia approximated by measuring the survival rate (SR), the growth rate of average daily weight , the content of mercury in the fish organs, hepatosomatic index (HSI), the relative bile volume (VER), gonadal soamtic index (IKG), fecundity and oocit diameter, tissue damage caused by mercury in fish organs by making histological preparations stained with hematoxylin and eosin. The median lethal concentration (96 hr, LC50) of Mercury Chloride was calculated as 1,64 mgL--1.The survival rate was highest in the control treatment (46,67 %) . Mercury chloride with concentration 0.196 mgL--1 show significant effect to changes HSI and relative bile volume, and oocyte diameter of Nile tilapia (p < 0,05). Mercury chloride with a concentration of 0,164 mgL-1 and 0,196 mgL-1 have not a significant effect on the growth rate of weight, gonadal somatic index and fecundity of Nile tilapia (p > 0,05). Mercury chloride cause damage to gills (hyperplasia, hypertrophy, proliferation and neukrosis), liver (hyperplasia, hemorhage, shrinkage of hepatocytes, proliferation and neukrosis) and kidney (hyperplasia, hemorrhage, shrinkage of the glomerulus, proliferation and neukrosis).
Keyword: Nile tilapia, Hepatosomatic indexs (HSI), histopathology