Judul: Pengaruh Pemupukan Litter Ayam dan Urea terhadap Komposisi Kimia dan Kandungan Oksalat Rumput Setaria Splendida Stapf
Abstrak: Penelitian ini dilakukan di Kebun Percobaan Institut Pertanian Bogor, Tajur, dimulai tanggal 22 Desember 1983 sampai dengan akhir April 1984. Tujuan penelitian ini adalah untuk melihat pengaruh pemupukan litter ayam dan urea terhadap komposisi kimia dan kandungan oksalat rumput Setaria splendida Stapf.
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Judul: Pengaruh kombinasi pupuk nitrogen dan kompos sampah kota terhadap kualitas rumput setaria splendida ( STAPF )
Abstrak: Penelitian ini dilakukan di Kebun Percobaan IPB di Tajur, selama empat bulan sejak tanggal 16 Februari sam- pai dengan 15 Juni 1984. Tujuan penelitian adalah untuk mempelajari pengaruh pemberian pupuk nitrogen dan kompos sampah kota terhadap kualitas rumput Setaria splendida (Stapf.). Pupuk nitro- gen yang dipergunakan adalah urea dengan dosis 0 kg/ha, 200 kg/ha dan 400 kg/ha. Sedangkan kompos berasal dari sampah kota Bogor dengan dosis 0 ton/ha, 30 ton/ha dan 60 ton/ha. Bibit rumput Setaria berupa pols, masing- masing dua individu setiap pols. Penelitian disusun dalam Rancangan Faktorial (3 x 3) dengan pola dasar Rancangan Acak Kelompok. Luas unit penelitian 12 m dengan tiga kelompok sebagai ulangan. Keseluruhan unit penelitian ada 27 unit. Hasil penelitian menunjukkan bahwa pemberian kompos sampah kota tidak mempengaruhi kadar dan produksi protein kasar hijauan. Pemberian pupuk nitrogen berpengaruh sa- ngat nyata (P0.01) terhadap kadar dan produksi protein kasar. Pengaruh interaksi kedua perlakuan tidak nyata (P>0.05). Kadar dan produksi protein kasar tertinggi diperoleh berturut-turut pada pemupukan nitrogen 400 kg, 200 kg dan 0 kg urea/ha. Pemberian kompos sampah kota sangat nyata (P0.01) mempengaruhi kadar serat kasar hijauan. Antara kedua perlakuan tidak terdapat interaksi (P>0.05). Pemberian kompos sampah kota 30 ton/ha (K) dan 60 ton/ha (K₂) ва- ngat nyata (PZ 0.01) pengaruhnya daripada tanpa perlakuan (K). Kadar serat kasar tertinggi diperoleh pada pembe- rian 30 ton perhektar. Terhadap kadar abu pemberian kompos sampah kota ber- pengaruh sangat nyata (P0.01). Demikian pula interak- sinya dengan pupuk nitrogen. Sedangkan pupuk nitrogen tidakmempengaruhi kadar abu. Baik kadar kalsium maupun kadar fosfor hijauan, ti- dak dipengaruhi oleh semua perlakuan. Interaksi antar perlakuan juga tidak berpengaruh. Tetapi produksi kalsium dan fosfor sangat dipengaruhi oleh pupuk nitrogen....
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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