Judul: Daya Rosot Karbondioksida Oleh Beberapa Jenis Tanaman Hutan Kota di Kampus IPB Darmaga
Abstrak: The increase of temperature in urban area is indirectly caused by the increase of Carbon Dioxide (CO2) concentration in the atmosphere. The increase is caused by land cover alteration and high amount of human activities which uses fossil fuel. The existence of urban forest is one of the ways to coupe the increase of CO2 concentration in the urban atmosphere. Through photosynthesis process, CO2 gas is absorbed by various plants in urban forest and afterwards being released as Oxygen (O2). To control or reduce the concentration of CO2 effectively, in the establishment of urban forest, selection of plants which have maximum ability in reducing CO2 concentration needs to be done. The objectives of this research are to obtain data CO2 sink ability of 15 urban forest plant species in Bogor Agricultural University and to obtain data about the plant species that has the effective CO2 sink ability among the plants which are measured. The measuring of CO2 sink ability was conducted using carbohydrate method. CO2 mass is obtained by converting carbohydrate mass produced in photosynthesis. Other data taken include leaf area and the number of leaves. The higher the leaf area, the higher CO2 sink ability of a leaf. The higher number leaf of a tree, the higher CO2 sink in a tree. The CO2 sink ability of 15 plant species in cm2 of leaf area are (g CO2/cm2/hour): M. caesia 3,793 x 10-4; D. indica 2,180 x 10-4; B. racemosa 1,600 x 10-4; S. campanulata 1,249 x 10-4; M. champaca 1,176 x 10-4; S. malacense 0,820 x 10-4 ; B. capitella 0,805 x 10-4; C. cauliflora 0,734 x 10-4; V. pubescens 0,669 x 10-4; C. inophyllum 0,629 x 10-4 ; M. ferrea 0,479 x 10-4; A. moluccana 0,357 x 10-4; A. dammara 0,268 x 10-4-; and G. dulcis 0,089 x 10-4. The CO2 sink ability of 15 plant species in urban forest in order from the highest are D. indica, M. caesia, S. campanulata, C. inophyllum, B. racemosa, V. pubescens, M. ferrea, C. cauliflora,B. capitella, G. dulcis, M. champaca, S. malacense, A. moluccana, and A. dammara. Keywords: carbon dioxide sink, urban forest.
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Judul: Daya Rosot Beberapa Jenis Pohon Perkotaan terhadap Karbondioksida (CO2) (Studi Kasus di Jalur Hijau Jalan Raya Pajajaran-Bogor)
Abstrak: The global warming happens due to high concentration of certain gasses in the air which are called Green Houses Gasses (GHGs). The global warming is mostly caused by human activities and industries. Carbon dioxide (CO2) is the most important anthropogenic GHGs which caused a variety of activities in both cities moving or not moving as households, hotels, industries, motor vehicles and other activities require driving and heating energy partly derived from the combustion of fossil fuels such as diesel, kerosene and coal. Increased levels of CO2 in the urban air can be overcome with the forest one city. The increment of CO2 concentration in the city can be decreased by implementing urban trees. Carbon dioxide will be absorbed and converted into oxygen through photosynthesis process. The selection of urban trees is needed in order to decrease CO2 effectively. Therefore the study on carbon dioxide sink ability of urban plants should be conducted. The CO2 sink ability of urban trees was measured using carbohydrate method. The carbon dioxide mass was obtained by converting the carbohydrate mass produced from photosynthesis. Other data that were collected consisted of total and width of leaves. More leaves per tree have higher ability of carbon dioxide sink. Wider leaf has higher ability of carbon dioxide sink too. The ability of CO2 sinks from nine species of urban trees is stated in cm2 of leaf width per hour (g CO2/cm2/hour). The result shows that the ability of C. manghas is 8,391 x 10-4; A. mangium is 3,430 x 10-4; S. macrophylla is 2,547 x 10-4; B. purpurea is 2,056 x 10-4; M. calabura is 1,843 x 10-4; F. elastica is 1,466 x 10-4; F. benjamina is 0,787 x 10-4; P. indicus is 0,630 x 10-4; and S. mahagoni is 0,499 x 10-4. It can be concluded that C. manghas, F. elastica and S. macrophylla are the most effective in sinking the CO2.
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Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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