Judul: IPB (Bogor Agricultural University)
Abstrak: Transportation is an important source of anthropogenic air pollutants including carbon monoxide (CO), nitrogen dioxide (NO2), and sulfur dioxide (SO2). Vegetation has long been known to have the ability to absorb these pollutants through gas exchange processes. A number of works to investigate plant capability in absorbing NO2 have been reported in several literatures; however, information on plants tolerance to NO2 is very limited. The objectives of this study attempt to infer the effectiveness and tolerance of specified local plants in reducing NO2 through a sequence of laboratory and field experiments, which is primarily to investigate NO2 based nitrogen, and explore distributional patterns of NO2 in specified plants. Plant species are chosen from a variety of greenbelt trees and through the analysis of total ascorbate which suggest the selection of eight greenbelt trees species. They are Pterocarpus indicus, Lagerstroemia speciosa, Casuarina sumatrana, Delonix regia, Gmelina arborea, Cinnamomum burmanii, Swietenia macrophylla, and Mimusops elengi. The capability of plants to absorb and the translocation NO2 are analyzed from experiment using labeled nitrogen (15NO2). Fields experimental data are collected from a highly polluted location around midway of Jagorawi highway and a relatively unpolluted area of Sindangbarang field station. Relative growth rate and physiological parameters recorded include height, leaf area, total ascorbate, total chlorophyll, leaf-extract pH, and relative water content. Relative growth rate is calculated from measurements of plant heights and leaf areas, while plant physiological data are presented as APTI (Air Pollutant Tolerance Index). Tolerance of plant species is calculated based on the relative growth rate obtained previously. Distributional patterns of NO2 and plants capability in absorbing NO2 are derived from measurements of NO2 concentrations in both the uncovered and covered locations.
Keyword: West Java, Jagorawi highway, Sindangbarang field station, Pencemaran udara

Judul: Kapasitas Penyerapan Emisi CO2, NO2, dan Debu Jatuh dari Sektor Transportasi, Industri, dan Peternakan oleh Kebun Raya Bogor
Abstrak: One of the environmental issue is the increasing of air pollution concentration. On the other hand, Bogor Botanical Gardens has high potential as an air quality controller. This study aims to calculating Bogor Botanical Gardens plants ability to reduce CO2, NO2, and dustfall, analyzing the correlation of leave morphology with the plant ability in absorb dustfall, and determine criteria of plant that can reduce CO2, NO2, and dustfall. Total amount of CO2, NO2, and dustfall emission and Bogor Botanical Garden sink ability was calculated by secondary data from multiple source unit and its corresponding emission factors. The ability of several plant to absorb dustfall calculated by gravimetric method using samples from Bogor Botanical Garden. The sample plant are Sansevieria trifasciata, Cinnamomum multiflorum, Callicarpa pedunculata, Carmona retusa, dan Antigonon leptopus. The analysis show that Bogor Botanical Gardens is be able to reduce CO2 emissions by 28.7%, NO2 by 2.2%, and dustfall by 11.4%. Plant ability to absorb dustfall are 0.02-0.7 mg/cm2. The most effective species to absorb dustfall is Carmona retusa with maximum capacity of 0.7 mg/cm2.
Keyword: nitrous dioxide., Bogor Botanical Garden, carbon dioxide, dustfall, absorption

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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