Judul: Pengaruh Pemupukan Amonium Sulfat Dalam Penekanan Penyakit Kudis Kentang
Abstrak: Penelitian bertujuan untuk melihat pengaruh pemupukan amonium sulfat terhadap penekanan penyakit kudis kentang (common scab), dan pengaruhnya terhadap produksi dan kualitas tanaman kentang, dengan cara mengaplikasikan amonium sulfat ke dalam barisan pertanaman kentang. Penelitian ini dilaksanakan di Pegunungan Dieng Jawa Tengah, tepatnya di desa jatilawang, Kecamatan Wanayasa, Kabupaten Banjarnegara Lokasi penelitian pada malam hari berkisar antara 8 - 15⁰C dan pada siang hari mencapai 25⁰C. Penelitian dilaksanakan mulai bulan Februari sampai dengan bulan Juli 2001.
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Judul: Pengaruh pemupukan urea dan amonium nitrat pada tanah yang terkena dan tidak terkena air buangan pabrik urea PT Pupuk Kujang terhadap pertumbuhan dan produksi padi sawah
Abstrak: Pupuk merupakan sarana yang sangat penting dalam meningkatkan produksi tanaman pangan. Mengingat besarnya devisa yang harus disediakan untuk import pupuk sedangkan bahan baku untuk pembuatan pupuk cukup tersedia dalam negeri, maka dirasakan perlu untuk memproduksinya sendiri. Buangan cair pabrik urea P.T. Pupuk Kujang terutama berisi amoniak, urea serta biosida dan akan tertampung pada sungai Cikaranggelam yang pada prakteknya perairan sungai ini digunakan untuk pengairan pertanian, mandi, cuci, dan kakus. Kerusakan akan terjadi pada tanaman padi sawah apabila kadar urea dan amoniak yang sangat tinggi terjadi pada tanah persawahan. Untuk melihat fenomena tersebut pencemaran yang terjadi dipelajari dengan memberikan kepada tanaman padi sawah limbah buatan dari pupuk urea dan amonium nitrat. Tujuan penelitian ini adalah mempelajari pengaruh berbagai takaran pupuk N yang berasal dari urea dan amonium nitrat terhadap pertumbuhan dan produksi padi sawah pada tanah yang terkena dan tidak terkena air buangan pabrik urea PT. Pupuk Kujang, berturut-turut disebut tanah tercemar dan tidak tercemar serta mempelajari susunan kimia tanaman padi pada fase vegetatif dan generatif pada kedua keadaan tanah yang memperoleh berbagai takaran N berasal dari urea dan amonium nitrat.
Keyword: Waste water;, Production;

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