Judul: Spectral Response of Several Species of Urban Plant to Air Pollution
Abstrak: Pemilihan jenis tanaman merupakan faktor penting yang menentukan keberhasilan pembangunan hutan untuk menanggulangi pencemaran udara. Penggunaan teknologi spektral diharapkan dapat menjadi terobosan dalam pemilihan jenis tanaman. Penelitian ini bertujuan untuk menguji perbedaan respon spektral beberapa jenis anakan tanaman pada area tercemar dengan kurang tercemar dan menentukan tingkat ketahanan beberapa jenis anakan tanaman berdasarkan respon spektral. Penelitian ini dilaksanakan pada bulan Juli – Agustus 2020 di Tol Jagorawi Bogor Km 43 yang dibagi menjadi area tercemar dan kurang tercemar. Alat utama yang digunakan untuk pengambilan nilai radiasi spektral adalah HandHeld 2 Spectroradiometer. Metode clustering digunakan untuk menentukan klasifikasi tinggi, sedang, dan rendah, sedangkan besarnya perubahan nilai spektral pada dua area untuk menentukan ketahanan tanaman. Hasil menunjukkan bahwa terdapat perbedaan respon spektral tanaman antara area tercemar dan kurang tercemar. Urutan tingkat ketahanan tanaman terhadap pencemaran udara yaitu: mahoni, ketapang, akasia, tanjung, dan nyamplung.
Keyword: clustering, less polluted, polluted, spectral response.

Judul: Toleransi dan respon fisiologi tanaman Celosia cristata, Gomphrena globosa, dan Catharanthus roseus terhadap zat pencemar udara
Abstrak: Air pollution is an environmental issue that occurs due to change in air composition of its normal state. Plants have been known as bio indicator for air pollution through the growth response. Information capability of herbs plant to absorb pollutant is very limited. The objectives of this research were to determine the tolerance and physiological responses of Celosia cristata, Gomphrena globusa, and Catharanthus roseus due to air pollutant. On the other site, data were also collecyed at green house of IPB Dramaga, which has a relatively low of pollutants. Growth and physiological parameters were recorded include plant height, number of leaf, total leaf area, number of leaf senescence, fresh and dry weight of plant, chlorophyll content, ascorbic acid content (ASA), and the activity of ascorbate peroxidase (APX). Data were analyzed by analysis of variance and Duncan Multiple Range Test (DMRT). This study revealed that plants on location with relatively high of pollutant have plant height, number of leaf, total leaf area, fresh and dry weight lower than those of plants on relatively low of pollutant whereas, total leaf senesence increased. Cataranthus rosesus showed decreasing of chlorophyll content and increasing of APX activity as physiological response due to air pollutant.
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Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
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