Judul: Pengaruh penambahn kapur terhadap pelepasan gas NH3 pada manur ayam petelur
Abstrak: Jumlah manur, sebagai produk samping peternakan, sudah tidak terkendali sehingga menyebabkan pencemaran tanah, air, dan udara. Salah satu cara untuk mengatasi masalah ini adalah melalui penambahan kapur dan manur. Pada penelitian ini, dianalisis pengaruh penambahan kapur terhadap pelepasan gas NH3 pada manur ayam petelur dan hubungannya dengan kadar air, pH, konsentrasi kapur yang digunakan, serta konsentrasi protein manur.
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Judul: Evaluasi Penambahan Tepung Kerabang Telur terhadap Konsentrasi Gas Amonia (NH3) pada Litter Ayam Petelur
Abstrak: Gas amonia (NH3) merupakan gas berbahaya yang dihasilkan dari manur ayam. Manajemen pemeliharaan yang baik terutama manajemen litter sebagai alas kandang diperlukan menanggulangi produksi gas amonia. Penambahan kapur pada litter dapat meredam NH3 yang diberasal dari manur. Kerabang telur merupakan hasil ikutan dari peternakan ayam petelur dan industri penetasan yang memiliki komposisi utama kalsium karbonat (CaCO3). Penelitian ini mengevaluasi penambahan tepung kerabang telur dengan berbagai konsentrasi terhadap konsentrasi NH3 pada litter ayam petelur. Sekam sebagai bahan litter ditambahkan tepung kerabang telur dengan 4 konsentrasi berbeda yaitu, 0%, 5%, 10%, dan 15 % kemudian ditambahkan manur ayam petelur dan diratakan. Setelah 24 jam setiap perlakuan diukur konsentrasi NH3, pH, kadar air, total mikroba, dan protein manur. Percobaan menggunakan rancangan acak lengkap yang diulang sebanyak 3 kali. Hasil penelitian menunjukan bahwa penambahan tepung kerabang telur dapat meningkatkan pH dan menurunkan kadar air, total mikroba, serta konsentrasi gas NH3. Penambahan tepung kerabang telur pada kadar 15% menghasilkan konsentrasi gas NH3 terendah sebesar 0.66 ppm.
Keyword: gas amonia, kerabang telur, litter

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