Judul: Fungsi jalur hijau hutan mangrove untuk menanggulangi pencemaran di lingkungan pesisir : Studi kasus pada mintakat jalur hijau di kawasan hutan mangrove PT Bina Lestari I Riau
Abstrak: Melihat beragam fungsi dan manfaat hutan mangrove dalam kaitannya dengan siklus hara dan energi, fungsi fisik, kimia dan hayati, dan keanekaragaman flora dan fauna, serta keberadaannya di kawasan pesisir yang menyebabkannya rentan terhadap pencemaran dan pengubahan status kawasan. Maka setiap usaha pengelolaan harus diarahkan bagi perlindungan situs ekoton yang unik ini, sehingga segala aspek yang mendukung perlindungan perlu terus digali dan diupayakan, salah satunya adalah aspek penelitian. Penelitian pada mintakat jalur hijau di kawasan hutan mangrove PT Bina Lestari I Riau yang dilakukan bulan Oktober 1996 sampai bulan Februari 1997 ini bertujuan untuk mengetahui tingkat akumulasi logam berat Cu, Mn, dan Zn pada vegetasi mangrove dan bagian morfologi pohon, serta untuk mengetahui peran mintakat jalur hijau tersebut dalam meregulasi pencemaran oleh logam berat. Plot dan petak pengambilan contoh vegetasi, tanah, dan air dirancang dengan memperhatikan perubah-peubah jarak dari sumber pencemar dan muara sungai, letak vegetasi secara melebar dalam jalur hijau, pengaruh zonasi serta beda tanggap antar jenis pohon dalam mengakumulasi logam pencemar. Hasil analisis menunjukkan bahwa jenis logam berat yang paling banyak dikandung dalam vegetasi dan tanah adalah Mn diikuti Cu dan Zn, sedangkan pada contoh air adalah Zn kemudian Cu dan Mn. Tinjauan pada bagian morfologi pohon, daun mengandung logam berat paling tinggi sebesar 133,0 ppm dibandingkan batang (43,2 ppm) dan akar (40,5 ppm). Hasil ini tentunya berkaitan erat dengan fungsi bagian morfologi tersebut dalam proses fisiologis meregulasi pencemar serta sifat dan kekhasan prilaku ketiga jenis logam tersebut di lingkungannya. Hasil analisis...
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Judul: Akumulasi Logam Berat Tembaga (Cu) dan Timbal (Pb) pada Pohon Mangrove (Rhizopora mucronata) di Perairan Karangsong, Indramayu.
Abstrak: Mangrove has many economical and ecological functions, one of its abilities is to absorb, transport and store substances including toxic materials. This research aim is to analyze the concentration of Cu and Pb in root, leave and substrat of mangrove Rhizopora mucronata and its bioaccumulation level. The concentration of Cu found in sediment exceed standar quality by RNO, which means the sediment has been contaminated by Cu. The content of Cu in the roots and leaves of mangrove is greater than Pb, so does the highest level of bioconcentration factor (BCF) was reached by BCF Pb in root at 1.3116 while BCF Cu in roots at 0,5609. This indicates that the potention of accumulation of roots is much higher than the leaves. The highest Translocation Factor (TF) was attained by Pb which is 0.4075 and the lowest is 0.3341 in Cu. Metal translocation from roots to leaves for essential metals (Cu) is lower than in non-essential metals (Pb), it shows that the mangrove use Cu for metabolic activity and growth. The ability of mangrove in accumulating this metals are still low in category according to Concentration Factor Index.
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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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