Judul: Perbandingan Pengaruh Bioearth dan Blotong terhadap Ketersediaan dan Serapan Nitrogen, Fosfor, Kalium serta Produksi Bahan Kering Tanaman Tebu (Saccharum officinarum L.) pada Regosol (Troposamment) Krembung Sidoarjo
Abstrak: Tujuan penelitian ini adalah untuk membandingkan pngaruh penggunaan bioearth dan blotong terhadap ketersediaan nitrogen, fosfor, kalium serta produksi bahan kering tanaman tebu (Saccharum officinarum L.) varietas Ps 57. Percobaan dilakukan d i rumah kaca dengan menggunak-sn Rancangan Acak Lengkap dengan 9 perlakuan dan 3 ulangan. Perlakuan meliputi C = kontrol atau tanpa blotong dan bioearth, A1 = diberi blotong setara 7.5 ton/ha, A2 = blotong setara 15 ton/ha, A3 = blotong setara 22.5 ton/ha, A 4 = blotong setara 30 ton/ha, B, = bioearth setara 7.5 ton/ha, B2 = bioearth setara 15 ton/ha, B3 = bioearth setara 22.5 ton/ha, dan B4 = bioearth setara 30 ton/ha.
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Judul: Penentuan Dosis Penentuan Dosis Pemupukan Kompos Blotong Pada Tebu Lahan Kering (Saccharum officinarum L.) VARIETAS PS 862 dan PS 864
Abstrak: Gula merupakan komoditas yang menempati posisi penting. Konsumsi gula di Indonesia terus meningkat namun hal ini belum dapat diimbangi oleh produksi gula dalam negeri. Produksi gula ini dipengaruhi oleh budidaya tebu yang saat ini berkembang luas di lahan kering. Hal ini terlihat dari luas lahan kering total Indonesia 318 495,4 ha atau 74,25 % luas areal tebu dengan total produksi gula 2,418 juta ton. Sementara total kebutuhan gula dalam negeri tahun 2008 adalah 4 640 407 ton. Dengan demikian, kendala budidaya di lahan kering sangat penting ditemukan solusinya. Salah satu solusinya adalah memanfaatkan limbah pabrik yaitu blotong sebagai pupuk kompos bagi tanaman tebu itu sendiri. Percobaan ini dilakukan di rumah kaca Balai Penelitian Cimanggu, Bogor berukuran 4 m x 10 m sejak bulan Maret 2007 sampai Juni 2007 dengan metode rancangan petak terbagi (Split Plot Design). Varietas sebagai petak utama dan dosis kompos blotong sebagai anak petak dengan tiga ulangan. Varietas yang digunakan adalah PS 862 (V1) dan PS 864 (V2). Dosis kompos blotong yang diberikan 0 ton/ha (B1), 5 ton/ha (B2), 7,5 ton/ha (B3), 10 ton/ha (B4) dan 12,5 ton/ha (B5). Percobaan ini menunjukkan bahwa pengaruh varietas terhadap pertumbuhan tanaman nyata pada tinggi tanaman 6 MST dan 12 MST, jumlah daun 10 MST dan luas daun pada 10 MST dan 12 MST. Pengaruh varietas terhadap pertumbuhan sangat nyata pada tinggi tanaman 4, 8 dan 10 MST, jumlah daun 8 MST, jumlah anakan, diameter batang dan bobot kering akar pada 12 MST. Pengaruh pemupukan kompos blotong terhadap pertumbuhan tanaman nyata pada jumlah daun 6 MST dan diameter batang 12 MST. Tidak terjadi interaksi antara varietas dan pemupukan kompos blotong. Pengaruh pemupukan kompos blotong terhadap sifat kimia tanah tidak nyata.
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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