Judul: Pengaruh Dosis Pemupukan Nitrogen Terhadap Produksi Tunas Untuk Bahan Stek Pada Tanaman Pepaya (Carica papaya L.)
Abstrak: Percobaan ini dilalkukan untuk mengetahui pengaruh dosis pemupukan nitrogen terhadap produksi tunas untuk bahan stek dan daya hidup stek pada tanaman pepaya yang dilaksanakan di Kebun Percobaan Pusat kajian Buah-buaban Tropika (PKBT) Pasir Kuda Ciomas Bogor pada bulan Juli 2006 - Juni 2007.
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Judul: Pengaruh pemupukan nitrogen terhadap pertumbuhan vegetatif pepaya (Carica papaya L.) pada umur bibit yang berbeda
Abstrak: Penelitian ini dilakukan untuk mengetahui pengaruh umur bibit dan dosis pupuk N terhadap pertumbuhan vegetatif pepaya. Penelitian dilaksanakan pada bulan November 2002 sampai Mei 2003 di Kebun Percobaan IPB Cikabayan. Bogor dengan kandungan N total tanah sebesar 0.09%. Lokasi penelitian terletak pada ketinggian tempat 250 m dpl (di atas permukaan laut). Bahan tanaman yang digunakan adalah benih pepaya genotipe "IPB-I" hasil pemuliaan Pusat Kajian Buah-buahan Tropika. Pupuk yang digunakan adalah Urca, TSP, KCI dan pupuk daun gandasil D. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok (RAK) dengan dua faktor. faktor pertama yaitu umur bibit yang terdiri dari umur bibit 10 dan 6 minggu, faktor kedua yaitu dosis pupuk N yang terdiri dari 4 taraf: Og urea/tanaman, 130 g urea/tanaman, 260 g urea/tanaman dan 390 g urea/tanaman. Dengan demikian dalam percobaan ini terdapat 8 kombinasi perlakuan, masing-masing dengan 7 ulangan sehingga terdapat 56 satuan percobaan. Pengamatan dilakukan terhadap karakter vegetatif yaitu tinggi tanaman, diameter batang, panjang petiol, jumlah daun dan karakter generatif yaitu waktu muncul bunga pertama, jumlah bunga dan jumlah bunga menjadi buah (fruit set). Hasil penelitian menunjukkan bahwa perlakuan umur bibit yang digunakan berpengaruh nyata terhadap karakter vegetatif yang diamati meliputi tinggi tanaman, jumlah daun, diameter batang dan panjang petiol. Pemberian dosis. pupuk N nyata meningkatkan tinggi tanaman, jumlah daun, diameter batang. panjang petiol, mempercepat waktu munculnya bunga pertama, meningkatkan jumlah bunga dan jumlah fruit set. Interaksi umur bibit dan dosis pupuk N berpengaruh nyata terhadap peubah diameter batang (17 MST), panjang petiol (10) dan 18 MST), jumlah daun (10-14 MST), waktu muncul bunga pertama, jumlahi bunga (10-12 MST) dan jumlah fruit set (18 MST),
Keyword: Carica papaya L., nitrogen fertilizers, papaya

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