Judul: Pengaruh beberapa jenis bahan organik (Azolla pinnata, sampah organik, pupuk kandang) dan kapur terhadap beberapa sifat fisik tanah dan pertumbuhan tanaman kacang tanah (Arachis hypogaea L.) pada podsolik Jasinga
Abstrak: Penelitian ini bertujuan untuk melihat pengaruh pemberian bahan organik dan kapur terhadap beberapa sifat fisik tanah, pertumbuhan dan perkembangan akar tanaman kacang tanah pada Podsolik Jasinga. Tanah yang digunakan adalah Podsolik Jasinga yang diambil dari lapisan olah pada kedalaman O 30 cm; bahan organik berupa Azolla pinnata, sampah kota organik dan pupuk kandang diberikan dengan taraf 0 ton/ha, 7,5 ton/ha, 15 ton/ha; dan kapur yang digunakan adalah kapur kalsit dengan taraf 0 ton/ha (0 Al-dd) dan 24,87 ton/ha (1 Al-dd). Pupuk dasar yang diberikan terdiri dari urea (200 kg/ha), TSP (200 kg/ha), dan KCI (150 kg/ha). Rancangan percobaan yang digunakan adalah Rancangan acak lengkap faktorial, dua tiga ulangan. faktor dan Hasil penelitian ini menunjukkan bahwa pemberian bahan organik nyata menurunkan bobot isi tanah dari 1.02 gram/cm³ menjadi 0.96 gram/cm³ atau penurunan sebesar 5.88%, dan meningkatkan persentase pori drainase cepat dari 4.60% menjadi 9.34%。 ...
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Judul: Pengaruh kapur dan bahan organik terhadap beberapa sifat tanah dan produksi kacang tanah pada tanah podsolik merah kuning gajrug
Abstrak: Penelitian ini bertujuan untuk melihat pengaruh kapur dan bahan organik yang ditambahkan ke dalam tanah terhadap beberapa sifat kimia tanah antara lain pH, Al-dd, N-total, C-organik, P-tersedia, Ca-dd, K-dd dan fig-dd, serta produk- si tanaman kacang tanah (Arachis hypogaea L.) Percobaan dilakukan di rumah kaca dan laboratorium JU- rusan Tanah, Fakultas Pertanian, Institut Pertanian Bogor. Dalam percobaan ini digunakan tanah Podsolik Merah Kuning Gajrug, dengan tanaman uji kacang tanah varietas Gajah. Bahan kapur yang digunakan adalah kalsit, dan bahan organik berupa jerami padi dan alang-alang. Pupuk yang dipakai ada- lah Urea, TSP, KCl, MgO, ZnSO4, CUSO4, H3BO3 dan NazM0040 Dalam percobaan ini digunakan rancangan acak lengkap dalam percobaan faktorial. Kapur diberikan sebagai perlakuan da- lam tiga taraf, masing-masing tanpa kapur, setara 1 Al-dd dan 2 Al-dd. Perlakuan Bahan Organik terdiri dari tanпра bahan organik (o ton/ha), dengan 20 ton/ha jerami padi dan 20 ton/ha alang-alang. Pupuk dasar yang diberikan terdiri dari 100 ppm N, 200 ppm P, 200 ppm K, 490 ppm Mg, 5 ppm Zn, 5 ppm Cu, 1 ppm B dan 1 ppm Mo....
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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