Judul: Dampak Pencemaran Udara Terhadap Tumbuhan di Kebun Raya Bogor
Abstrak: The Bogor Botanical Garden is the one of the biggest and most complete botanical garden in the world. But recently, pollution sources around of the garden such as motor vehicles could be harms to the garden. Air pollution gasses such as SO,,NO, and Pb particle are released by the motor vehicles and known as a phytotoxic agent. The objective of this research is to study the impact of the air pollution on the vegetation by measuring; concentration of SO,, NO, and Pb particles in the air, chlorotic and necrotic damage level on the leaves, damage percentage and the measurement of the cells and chlorophyll content in the leaves. This research was conducted from August 1997 to Februw 1998. Research used seven plots and nineteenth plants species of dicotyl class. Air pollution gasses were observed by Spectrophotometer and Pb particles by Atomic Absorption Spectrophotometer. Chlorotic and necrotic damages were observed by magnifying glass, cells damages and measurement by microscope, and leaves chlorophyll content by Spectrophotometer. Varian, regression and descriptive analysis analyzed data. The result of this research shows that pollution by SO2, NO2 gasses and Pb particles in the air of the garden mostly higher in every side of the garden. NO2 and Pb particles polluted the garden over the threshold limit allowed. Statistic analysis result that from the three pollutants in the air observed NO2 was only significant between plots. The concentration was mostly influenced by -amount of motor vehicles and wind directions. The impact on the vegetation showed that there are no both chlorotic and necrotic on the 19 plant species observed, so it was classified as zero in Kovack's levels. Cells damage was variously founded from one species to another. The highest damage was founded on F. Racemosa, V.cofassus and T. Hornemanium, which are growth on the roadside plots and highly air pollutant concentration. Chlorophyll content are significant different between species in each plot and was influenced by air pollution. The impact on kenari (C. vulgare) plant clearly observed that the leave cells anatomy measured become narrower, chlorophyll content lower and Pb particles higher when the air pollutants concentration are high.
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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: 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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