Judul: Evaluasi in vitro SENTRO (Centroma pubescens) Benth. Hasil Pemupukan Air Belerang dan Pupuk Kandang
Abstrak: Hijauan merupakan makanan utama bagi ternak ruminansia. Oleh karena itu kualitas hijauan harus diperhatikan agar meningkatkan produktivitas ruminansia. Centrosema pubescens Benth, atau sentro, temasuk kedalam leguminosa merambat yang berpotensi sebagai sumber protein (16-19%). Penlupukan dapat tnempengaruhi komposisi
Keyword: Centrosema pubescens, manure

Judul: Evaluasi in vitro sentro Centrosema pubescens Benth. hasil pemupukan air belerang dan pupuk kandang
Abstrak: Hijauan merupakan makanan utama bagi ternak ruminansia. Oleh karena itu kualitas hijauan harus diperhatikan agar meningkatkan produktivitas ruminansia. Centrosema pubescens Benth. atau sentro, termasuk kedalam leguminosa merambat yang berpotensi sebagai sumber protein (16-19%). Pemupukan dapat mempengaruhi komposisi hara di dalam tanah, yang selanjutnya dapat mempengaruhi komposisi serta kualitas hijauan yang ditanam; tergantung dari jenis dan komposisi pupuk yang digunakan. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pemberian air belerang dan pupuk kandang (sebagai pupuk) dengan taraf yang berbeda terhadap komposisi nutrisi nilai nutrisi Centrosema pubescens. Penelitian ini dilakukan pada bulan Juni sampai November 2003, yang bertempat di Laboratorium Lapang Agrostologi, Laboratorium Nutrisi Temak Daging dan Kerja, dan Laboratorium Nutrisi Ternak Perah, Departemen Ilmu Nutrisi dan Makanan Ternak, Fakultas Peternakan, Institut Pertanian Bogor. Rancangan percobaan yang digunakan dalam penelitian ini adalah Rancangan Acak Kelompok (RAK) berdasarkan waktu pengambilan cairan rumen berpola faktorial 2X5, dengan ulangan sebanyak 3 kali. Penelitian ini terdiri dari 2 faktor, dengan faktor pertama adalah pupuk kandang: 0 dan 25 ton/ha. Faktor kedua: air belerang dengan kadar 0, 25, 50, 75 dan 100%. Peubah yang diukur pada adalah kecernaan bahan kering (KBK), kecernaan bahan organik (KBO), produksi NH3, dan produksi VFA. Hasil penelitian menunjukan bahwa pada tiap-tiap peubah yang diamati nilai rataan produksi NH3, VFA, Kecernaan Bahan Kering (KBK) dan Kecernaan Bahan Organik (KBO) tertinggi dicapai pada kombinasi pupuk kandang 25 ton/ha dengan taraf pemberian air belerang 50%. Disimpulkan bahwa pemupukan dengan pupuk kandang dan air belerang dapat meningkatkan produksi NH3, VFA, KBK dan KBO.
Keyword: Centrosema puhescens, air belerang, pupuk kandang.

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