Judul: Blossoming Stimulation on Five Species of Bush Growing in Polluted
Abstrak: This research is aimed at finding out the influence of the growth-slowening- substance called paclobutrazol towards the blossoming stimulation of five species of bush planted on polluted street side. It is also aimed at finding out which species that is tollerant to the pollutant, so that in the future it can be recommended to be planted on the street side. The research is carried out both in the streets with heavy traffic and in a greenhouse (the controll subjects). The research design used for the present research is the Random Factorial Group design that consists of 2 treatmen and 3 times of repetitions. The results of the research-show that the content of NO₂ in the bush growing in the streets is 89.53 µg/m³ (0.0477 ppm), whereas the content of SO2 is 3.81 µg/m³ (0.0015 ppm). This is considered to be harmless for the generative growth of the bush because it is still below the standard limit. The content of Pb in Musaenda alba growing both in the streets and in the greenhouse is mostly about 0.059 (µg/cm²) and 0.012 (µg/cm³) respectively. The biggest deposit of Pb occurs on the streets with heavy traffic. The colour of blossoms and leaves of the bush growing in the streets and greenhouse does not show any significant difference. Lantana camara has a very good ability to grow in a polluted surrounding. This is proved by the evidence, in terms of the number of blossoms, that those growing in the streets have 15,2, whereas those growing in the greenhouse have 6,8. Meanwhile, the use of paclobutrazol towards the number of blossoms is 300 ppm. Mussaenda alba growing in the streets have the lowest APTI (Air Pollution Tolerance Index) value, namely 10.20, so that it is categorised as the bush that is very sensitive againts the air pollution caused by motor vehicle's emmision. However, in the greenhouse, it has APTI value of 15.48. Allamanda cathartica, Lantana camara, Ixora javanica growing in the streets have sufficient tollerance against the air pollution, whereas Jatropha gossypifolia is relatively tollerant against the air pollution. In the greenhouse, Allamanda cathartica and Ixora javanica have sufficient tollerance againts the air pollution, whereas Lantana camara, Mussaenda alba and Jatropha gossypifolia are relatively tollerant against the air pollution. The use of paclobutrazol towards the APTI values in the streets is lower than in the greenhouse.
Keyword: Heavy traffic, Green house, Pullution, Tolerance, greenhouse, pollution, tolerance

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: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
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