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: 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: Algorithm Construction of HLI Hash Function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice