Judul: Mempelajari Degradasi Minyak Bumi Oleh Bakteri Epyzim Serta Campuran Bakteri Pseudomonas aeruginosa dan Arthrobacter simplex
Abstrak: Pencemaran minyak bumi dapat terjadi karena tumpahan atau buangan selama kegiatan perminyakan mulai dari eksplorasi, eksploitasi, pengolahan serta pengangkutan minyak bumi dan produknya. Selama ini penanganan masalah tersebut umumnya dilakukan secara fisik dan kimia. Penanganan secara fisik hanya mampu mengambil minyak di permukaan, sedangkan penanganan secara kimia dapat menimbulkan pencemaran barn. Hal ini mendorong perkembangan metode biologis yang memanfaatkan mikroorganisme untuk menguraikan hidrokarbon minyak bumi. Penelitian ini bertujuan untuk mempelajari kemampllan mikroorganisme untuk mendegradasi minyak bumi pada berbagai konsentrasi yaitu 1 %, 3 %. 5 % dan 10 % (b/v) oleh bakteri Epyzim dan Campuran bakteri Pseudomonas aeruginosa dan Arthrobacter simplex. Media yang digunakan dalam penelitian ini adalah media Tauson.
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Judul: Biodegradasi minyak bumi oleh beberapa isolat bakteri pada berbagai konsentrasi NaCl
Abstrak: Pencemaran minyak bumi dapat terjadi karena tumpahan atau buangan selama kegiatan perminyakan mulai dari eksplorasi, eksploitasi, pengolahan serta pengangkutan minyak bumi beserta produknya. Umumnya, pencemaran minyak bumi ditangani secara fisik dan kimia. Namun, penanganan secara fisik hanya mampu mengambil minyak dari permukaan saja sedangkan penanganan kimia akan menimbulkan pencemaran baru. Hal ini mendorong perkembangan metode bioremediasi yang melalui mikroorganisme untuk mendegradasi hidrokarbon pada minyak bumi untuk menanggulangi pencemaran yang disebabkan oleh minyak bumi. Penelitian ini bertujuan untuk mengukur tingkat pertumbuhan bakteri dan mengukur laju degradasi minyak bumi pada berbagai konsentrasi NaCl yang mensimulasikan kadar garam didalam ekosistem perairan tawar, pesisir dan lautan, dimana kandungan garamnya didominasi oleh senyawa NaCl. Bakteri yang digunakan ada 4 macam terdiri atas Epyzim yang berbentuk batang dan bulat, serta bakteri lokal masing-masing yaitu Pseudomonas aeruginosa, Arthrobacter simplex dan Mycobacterium phlei. Bakteri dikultivasi dalam media nutrien broth dengan perlakuan NaCl masing-masing berkonsentrasi sebanyak 0, 15, 30 g/l dan ditambah minyak bumi sebanyak 3%. Sampel minyak bumi yang dipakai berasal dari salah satu sumur minyak milik PT PERTAMINA di kawasan Prabumulih, Jambi...
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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