Judul: Potensi Ecoenzyme Fuel Cell Berbasis Kulit Jeruk Keprok (Citrus reticulata) sebagai Energi Baru Terbarukan
Abstrak: Biomassa merubah sistem energi menuju modernisasi sistem bioenergi dengan memanfaatkan konsep biochemical system (BESs). Arah pergerakan energi terbarukan memanfaatkan katabolisme komponen organik substrat secara mikrobial dan oksidasi mikroorganisme yang menghasilkan elektron dan proton yang dikenal dengan microbial fuel cell (MFC). Seiiring dengan perkembangan jaman telah dikembangkan subtrat MFC yaitu fermented substrate. Salah satu fermented substrate yang dapat dikembangkan adalah ecoenzyme. Penelitian ini bertujuan menentukan energi listrik dari larutan Ecoenzyme Citrus reticulata dan elektrolit kalium permanganat (KMnO4). Ecoenzyme yang dibuat bedasarkan perbandingan 3:1:10 yang terdiri dari limbah kulit jeruk, molase dan air. Variabel yang diuji berupa tegangan, kuat arus dan rapat daya yang dihasilkan dari rancangan ecoenzyme fuel cell. Variasi perlakuan sistem dibedakan menjadi dua yaitu jumlah elektroda dan pengadukan serta tanpa pengandukan. Pengujian kinerja sistem diamati selama 4 minggu (600 jam). Tegangan tertinggi yang dihasilkan yaitu sebesar 650 mV. Arus terbesar yang dihasilkan oleh rangkaian adalah 29.55 mA. Penggunaan ecoenzyme dan KMnO4 dapat menghasilkan rapat daya (power density) terbesar 750 W/m2 pada perlakuan 3 pasang elektroda pada kecepatan 200 rpm.
Keyword: biomassa, Citrus reticulata, ecoenzyme, energi terbarukan, microbial fuel cell

Judul: Penggunaan Limbah Cair yang Berbeda pada Sistem Microbial Fuel Cell (MFC) sebagai Penghasil Biolistrik
Abstrak: Limbah cair dari industri perikanan, pengolahan kelapa sawit, dan tekstil berpotensi menghasilkan suatu energi listrik. Fuel cell sebagai energi alternatif dengan bebas polusi udara dan degradasi limbah. Salah satu sumber bahan baku fuel cell adalah mikroorganisme, energi listrik didapat melalui proses degradasi bahan organik oleh mikroorganisme melalui mekanisme bioelektrokimia atau dapat disebut dengan Microbial Fuel Cell (MFC). Tujuan penelitian ini yaitu mengidentifikasi potensi energi dari kandungan limbah cair perikanan, pengolahan kelapa sawit dan tekstil menggunakan teknologi microbial fuel cell dalam menghasilkan listrik serta membandingkan energi yang dihasilkan. Limbah cair perikanan, limbah cair tekstil dan limbah cair kelapa sawit dengan sistem MFC dapat menghasilkan tegangan listrik dengan rata-rata secara berurutan 0,33± 0,07 V, 0,28± 0,08 V dan 0,39± 0,08 V. Nilai tegangan tertinggi terdapat pada limbah cair kelapa sawit. Beban limbah yang dihasilkan setelah pelakuan pada analisis COD dan BOD masih diatas baku mutu limbah cair dari ketiga sampel.
Keyword: BOD, COD, limbah cair, microbial fuel cell, tegangan listrik

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