Judul: Estimation of Biomass, Carbon Stock and CO2 Absorption in Various Age Classes of Teak Stands in RPH Wungu, KPH Madiun
Abstrak: Isu pemanasan global yang saat ini terjadi menjadi pemicu diperlukannya informasi mengenai karbon. Salah satu faktor yang dapat menurunkan akumulasi karbon dioksida di atmosfer adalah penyerapan oleh vegetasi. Hutan melalui fotosintesis mengabsorbsi karbon dioksida dan menyimpannya sebagai materi organik dalam bentuk biomassa. Tujuan dari penelitian ini yaitu untuk menduga biomassa, simpanan karbon, serapan karbon dioksida (CO2) dan produksi oksigen (O2) pada berbagai kelas umur tegakan jati (Tectona grandis) di RPH Wungu, KPH Madiun. Metode yang digunakan dalam pengambilan data, menggunakan stratified sampling dengan plot lingkaran berukuran 0,1 ha sebanyak 57 plot. Analisis data pendugaan biomassa menggunakan persamaan alometrik. Biomassa, simpanan karbon, serapan karbon dioksida (CO2) dan produksi oksigen diperoleh dari konversi nilai biomassa. Hasil pendugaan rata-rata biomassa, simpanan karbon, serapan karbon dioksida dan produksi oksigen (O2) pada tegakan jati di RPH Wungu, KPH Madiun secara berurutan adalah 238,60 ton/ha; 112,14 ton/ha; 411,19 ton/ha dan 299,04 ton/ha., The issue of global warming that is currently happening is the trigger for the need for information on carbon. One of the factors that can reduce the accumulation of carbon dioxide in the atmosphere is absorption by vegetation. Forests through photosynthesis absorb carbon dioxide and store it as organic matter in the form of biomass. The study aims to estimate for biomass, carbon stock, carbon dioxide (CO2) absorption and oxygen (O2) production in various age classes of teak stands (Tectona grandis) in RPH Wungu, KPH Madiun. The method used in data collection, using stratified sampling with circular plots measuring 0,1 ha as many as 57 plots. Analysis of biomass estimation data using allometric equations. Biomass, carbon storage, carbon dioxide absorption and oxygen production were obtained from the conversion of biomass values. The results of the estimation for biomass, carbon storage, carbon dioxide (CO2) absorption and oxygen (O2) production in teak stands in RPH Wungu, KPH Madiun, respectively, were 238,60 tons/ha; 112,14 tons/ha; 411,19 tons/ha and 299,04 tons/ha.
Keyword: biomass, carbon stock, carbon dioxide, oxygen, Tectona grandis

Judul: Estimation of Biomass, Carbon Stock, and CO2 Uptake in Various Age Classes of Teak Stands in RPH Cipeundeuy, KPH North Bandung
Abstrak: Ekosistem hutan berperan penting dalam siklus karbon dunia, khususnya hutan tropis karena memiliki potensi terbesar dalam mitigasi CO2 dengan karbon yang tersimpan dalam biomassa hidup, tanah hutan, hingga kayu mati. Indonesia sangat berpotensi menjadi negara dengan penyerap emisi karbon karena mempunyai hutan tropis yang luas. Tujuan penelitian ini, yakni mengetahui dugaan biomassa dan stok karbon pada berbagai kelas umur tegakan Tectona grandis serta potensinya dalam menyerap karbondioksida (CO2) serta memproduksi oksigen (O2). Metode yang digunakan dalam pengambilan data, yakni menggunakan Stratified Sampling dengan plot persegi berukuran 25 m x 25 m sebanyak 55 plot. Kandungan biomassa diduga menggunakan persamaan alometrik. Hasil penelitian menunjukan simpanan biomassa 44.456,8 ton, stok karbon 22.228,4 ton, serapan CO2 163.156,6 ton, dan produksi O2 59.275,8 ton., Forest ecosystems play an important role in the world's carbon cycle, especially tropical forests because they have the greatest potential for CO2 mitigation with carbon stored in living biomass, forest soil, and dead wood. Indonesia has the potential to become a country that absorbs carbon emissions because it has extensive tropical forests. This study aims to determine the estimation of biomass and carbon stock in various age classes of stands of Tectona grandis and their potential to absorb carbon dioxide (CO2) and produce oxygen (O2). The data collection is using stratified sampling with 55 square plots (25 x 25 m). The biomass content was estimated using the allometric equation. The results showed that the biomass content of the stands was simpanan biomassa 44.456,8 ton , stok karbon 22.228,4 ton, produksi O2 59.275,8 ton, dan serapan CO2 163.156,6 ton, the carbon stock of the stands was 22.228,4 ton, the CO2 absorption potential of the stands was 163.156,6 ton, and the O2 production potential of the stands was 59.275,8 ton.
Keyword: biomass, carbon, oxygen, Tectona grandis, carbon dioxide

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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