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: Effect of vegetation and ambient temperature to absorbtion of NO2 gas pollutant
Abstrak: Street side green belt giving an esthetics value and increasing environmental quality. However existence of street side green belt in Indonesia, especially in urban area shows toward degradation of their quality. This thing caused by increasing of construction in urban, such as; infrastructure, settlement, commerce and industrial activity and transportation. Negative impact of construction in urban area is lowering of the environmental quality. The real form of degradation environmental quality is incidence of environmental contamination problem like ; water, soil and air pollution. Pollution problem can be reduced through by revegetation of town or urban forest. Plant can lessen pollution problem around the street through absorbtion of gas pollutant and adsorption of particle at leaf surface. To measure absorption of NO2 gas pollutant by plant of leguminoseae/fabaceae exposure to gas 15NO2 in gas chamber. Plant is exposured by gas during 60 minutes at concentration of 3 ppm ( v/v). Exposure treatment conducted at condition of temperature 30°C and 20°C, light intensity 1000 luxes and relative humidity of 60% twice replication. Plant species were exposured consisted of : flamboyan, asam jawa, petai, lamtoro, sengon, saga pohon, kaliandra and gamal. After plant were treated with gas 15NO2 , parts of plant cut and disjointed between roots, bar and leaf. After dried at temperature 80°C during 48 hours, every part of the plant were milled to be smooth. Total nitrogen content is analysed with kjeldahl method. After sample is prepared in the form of liquid, abundance 15N is analysed with spectrometer emission (NOI-6PC Analyzer). Result of research shows level of 15N absorption varied. Among 8 plant absorption ranged from 18,96 μg/g - 44,98 μg/g at temperature 30°C and from 13,90 μg/g - 26,99 μg/g at temperature 20°C. Plants which have the highest absorption is petai ( 44,98 μ g/g) and the lowest is flamboyan ( 13,90 μ g/g). Species that having highest level absorption suggested to be utilized in street side landscape plants functioned to lessen air pollution, especially gas NO2. stomata size has a positive correlation to absorption of gas 15N at both temperature, while respiration rate has a positive correlation to absorption rate on temperature of 30ºC and doesn't has an effect at temperature 20ºC. Absorption of NO2 is higher on 30ºC, than on 20ºC.
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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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