Judul: Kandungan logam berat (Pb dan Cd) pada tegakan pidada (Sonneratia alba) di hutan mangrove cagar alam Muara Angke DKI Jakarta
Abstrak: Berbagai jenis industri membuang limbahnya ke sungai yang mengalir ke pantai sehingga mengakibatkan beban pencemaraan di daerah pantai semakin tinggi dan akan menyebabkan penurunan kualitas lingkungan. Salah satu bahan pencemar yang berasal dari limbah industri adalah logam berat. Lingkungan perairan yang tercemar oleh logam berat akan menyebabkan terkontamiasinya berbagai biota di dalamnya, seperti tanaman mangrove yang berada di kawasan Cagar Alam Muara Angke. Penelitian ini dilaksanakan dengan tujuan untuk menge- tahui kemampuan menyerap dan akumulasi logam berat (Pb dan Cd) di bagian akar, batang dan daun pada tegakan pidada (Sonneratia alba). Metode pengambilan sampel pohon dengan membuat dua buah jalur yang memanjang. Pohon sampel yang diambil merupakan perwakilan dari kelas diameter < 10 cm, 10 20 cm, 21 - 30 cm, dan > 31 cm. Bagian pohon yang diambil adalah bagian akar, batang dan daun sebanyak 100 200 gram. Nilai kandungan logam berat (Pb dan Cd) hasil analisis laboratorium di uji dengan metode Kruskal Wallis untuk mengetahui beda nilai kandungan logam berat (Pb dan Cd) pada tiap-tiap bagian pohon, dan metode Wilcoxon Sum Rank Test untuk menguji beda kandungan logam Pb dan Cd pada tiap-tiap pohon pidada. ...
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Judul: Akumulasi Logam Berat Timbal (Pb) dan Cadmium (Cd) pada Pohon Mangrove (Avicennia marina) di Perairan Karangsong, Indramayu.
Abstrak: Mangroves are known to have the ability to absorb and store heavy metals and other contaminants in the body tissues such as leaf and root. This research was carried out in January-March 2013 with the aim to find out the levels of heavy metals Lead (Pb) and Cadmium (Cd) in root and leaf of Avicennia marina, as well as sediments in Karangsong waters, Indramayu. Sampling a root, leave, and sediments was repeated 3 times each. The results showed that levels of Pb in Avicennia marina already passed over the limit of tolerance concentration for plants, whereas the levels of Cd was below detection limit Based on the results, it can be seen Avicennia marina has a low level of bioconcentration factor (BCF), it means that Avicennia marina has a low capability to accumulate heavy metals. Meanwhile the value of translocation factor (TF) is high, mean Avicennia marina has high mobilization from roots to leaves. Based on the findings, it is strongly recommended to control pollutants falling into the aquatic environment, and to enhance mangrove rehabilitation program for ecological and economical function
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Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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