Judul: Pengaruh Teras Bangku dengan Penguat Teras terhadap Kualitas Lingkungan Tumbuh, Pertumbuhan dan Produktivitas Kopi Arabika
Abstrak: Tujuan penelitian ini adalah untuk (1) mengetahui pengaruh kombinasi terns bangku dan tanaman penguat terns terhadap kualitas air limpasan, dan (2) mengetahui kombinasi pengaruh terns bangku dan tanaman penguat terns terhadap volume air limpasan, erosi, status hara tanah, biologi tanah, status hara tanaman kopi Arabika, pertumbuhan dan produktivitas tanaman kopi Arnbika. Penelitian ini menggunakan petak-petak berukurnn 2 m x 22 m yang disusun berdasarkan Rancangan Acak Kelompok Lengkap, dengan lima perlakuan dan empat ulangan. Perlakuan yang diuji adalah (a) Kontrol, tanpa terns dan tanpa tanaman penguat terns; (b) Terns bangku tanpa tanaman penguat terns; (c) Terns bangku dengan tanaman penguat terns Vetiveria zizanioides; (d) Terns bangku dengan tanaman penguat terns Moghania macrophylla; dan (e) Terns bangku dengan tanaman penguat terns Leucaena leucocephala. Kualitas air limpasan, volume air limpasan, dan erosi diperoleh dengan simulasi hujan yang dilakukan sebelum dan setelah pemupukan dengan intensitas 22 mm selama 30 menit. Rataan dibandingkan dengan uj i kontras ortogonal. dst ...
Keyword: Teras Bangku, Produktivitas, Kopi Arabika

Judul: Pengaruh Pupuk Nitrogen-Fosfor dan Intensitas Naungan terhadap Pertumbuhan Bibit Kopi Arabika (Coffea arabica L.)
Abstrak: Percobaan ini bertujuan untuk mengetahui pengaruh pupuk nitrogen-fosfor dan intensitas naungan serta interaksinya terhadap pertumbuhan bibit kopi Arabilrn. Percobaan dilakukan di Kebun Percobaan IPB Leuwikopo, Rogor, mulai tanggal 25 Agustus 198l sampai tanggal 20 Januari 1985. Rnhan tanaman yang digunairan bibit Kopi Arabilra asal. biji dari lilon USDA 230762, berumur satu tahun dan belum bercabang. Percobaan mcnggunakan rancangan petak terpisah dengan dua ulangan dan enam tanaman contoh per perlakuan. Petak utama intensitas naungan, terdiri atas So = 0 %; SI = 35 $: clan S2 = 70 76. Sebagai anak petak adalah pupuk nitrogen-fosfor, terdiri atas Po = 0 g Urea +- O g TSP per bibit; PI = 6 g Urea + 3 g TSP per bibit dan P2 = 12 g Urea + 6 g TSP per bibit. Analisis data dilakukan dengan menggunakan sidik peragam.
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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