Judul: Pengaruh kompos sampah kota ampas tebu yang diperoses secara anaerobik terhadap beberapa sifat kimia dan biologi tanah podzolik merah kuning jasinga dan grumusol cihea
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh pemberian Kompos Sampah Kota dan Ampas Tebu yang diproses secara anaerobik terhadap beberapa sifat kimia tanah seperti pH,- Al-dd, C-organik, Total-N (termasuk NH4-N dan NO3-N), nisbah C/N dan P-tersedia, serta sifat biologi tanah iaitu populasi kapang, populasi total jasad renik, populasi Nitrosomonas, dan aktivitas jasad renik pada tanah Podzolik Merah Kuning Jasinga dan Grumusol Cihea. Percobaan dilakukan dengan menginkubasi tanah seberat 1.5 kg setara kering oven (105°C) yang dicampur dengan bahan kompos pada kapasitas lapang. Tiga kali pengambilan contoh tanah selama inkubasi iaitu pada 1, 45 dan 90 hari. Ran- cangan percobaan yang digunakan adalah Rancangan Faktorial Tersarang (Nested Factorial Experiments) dengan 3 ulangan; terdiri dari 2 faktor utama iaitu jenis tanah (Podzolik Merah Kuning Jasinga dan Grumusol Cihea) dan jenis kompos (Sampah Kota dan Ampas Tebu) serta 1 faktor acak bertaraf 4 iaitu takaran kompos 0, 10, 20 dan 40 ton/ha. Kompos sampah kota dan ampas tebu cenderung menurunkan pH tanah Grumusol Cihea, dan Al-dd tanah Podzolik Merah Kuning Jasinga, serta menurunkan nisbah C/N dan P-tersedia kedua tanah tersebut.
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Judul: Pengaruh kompos jerami padi dan serbuk gergaji karet terhadap beberapa sifat kimia dan biologi latasol darmaga dan grumusol cihea
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh kompos jerami padi dan serbuk gergaji karet yang diproses secara anaerob terhadap beberapa sifat kimia tanah seperti pH, C-organik, nisbah C/N, N-total, NH4-N, NO3-N, P-tersedia, Al-dd, dan beberapa sifat biologi tanah seperti aktivitas jasad renik, populasi fungi, total jasad renik, dan populasi Nitrosomonas. Penelitian ini dilakukan di rumah kaca dan laboratorium Jurusan Tanah, Fakultas Pertanian, Institut Pertanian Bogor, sera laboratorium Balai Penelitian Tanaman Pangan Cimanggu, Bogor. Pelaksanaan penelitian dimulai bulan Mei 1987 sampai Oktober 1987. Penelitian dilakukan dengan menginkubasikan tanah seberat 1.5 kg berat kering mutlak (105 °C) yang dicampur merata dengan kompos pada keadaan kapasitas lapang. Pengambilan contoh dilakukan tiga kali, iaitu pada hari inkubasi ke-1, 45, dan 90. Rancangan penelitian yang digunakan adalah Rancangan Faktorial Tersarang (Nested Factorial. Experiments) yang terdiri dari dua faktor utama iaitu jenis tanah (Latosol Darmaga dan Grumusol Cihea) dan jenis kompos (Jerami Padi dan Serbuk Gergaji Karet) serta satu faktor acak (Dosis Kompos) yang bertaraf empat iaitu 0, 10, 20, dan 40 ton/ha yang dilakukan dengan tiga ulangan.
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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