Judul: Pengaruh pemberian kotoran ayam dan abu sekam terhadap beberapa sifat kimia tanah, pertumbuhan dan produksi padi gogo varietas tondano pada tanah podsolik merah kuning Jasinga
Abstrak: Percobaan ini bertujuan untuk mengetahui pengarun kotoran ayam dan abu sekam terhadap beberapa sifat kimia tanah, pertumbuhan dan produksi padi gogo varietas tondano pada tanah Podsolik Merah Kuning Jasinga. Untuk maksud tersebut di atas dilakukan serangkaian. percobaan di rumah kaca dan di laboratorium Jurusan Ilmu Tanah. Kotoran ayam diberikan dalam 4 taraf dosis yaitu 0.5, 10, dan 15 ton per hektar; abu sekam diberikan dalam 3 taraf dosis yaitu 0, 1.5, dan 3 ton per hektar. Un- tuk mencegah timbulnya faktor pembatas yang tidak diingin- kan maka diberikan pupuk dasar antara lain 25 ppm N (urea), 25 ppm P205 (H3PO4), 25 ppm K₂O (KCl), 50 ppm Mg (MgSO4), dan 182 ppm Ca (CaCO3). Hasil percobaan menunjukkan bahwa kotoran ayam dan abu sekam berpengaruh terhadap perubahan kandungan hara. tanah. Pemberian kotoran ayam cenderung menaikkan C-or- ganik, N-total, P, K, KTK dan menurunkan kandungan Al dd dan pH. Pemberian abu sekam lebih menonjol pengaruhnya terhadap peningkatan kandungan S102. Terhadap tinggi tanaman dan jumlah anakan, pemberian kotoran ayam berpengaruh nyata. Pemberian abu sekam dan interaksi kotoran ayam dan abu sekam tidak berpengaruh nyata terhadap parameter-parameter tersebut. ...
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Judul: Pengaruh pemberian dolomit dan abu sekam terhadap pertumbuhan dan serapan P, K, Ca, Mg, Si oleh tanaman padi gogo varietas ir 36 pada tanaman podsolik merah jasinga
Abstrak: Percobaan dilakukan di Rumah Kaca dan Laboratorium Jurusan Tanah, Fakultas Pertanian, Institut Pertanian Bogor, serta di Laboratorium Balai Penelitian Tanaman Pangan Cimanggu Bogor, dari akhir Mei hingga akhir Oktober 1987. Tujuan percobaan ini adalah untuk mengetahui pengaruh pemberian dolomit dan abu sekam terhadap pertumbuhan dan serapan P, K, Ca, Mg, dan Si oleh tanaman, serta terhadap beberapa sifat kimia tanah. Sebagai bahan percobaan digunakan tanah Podsolik Merah Kuning Jasinga, dengan tanaman uji padi gogo varietas IR 36. Perlakuan yang diberikan adalah pemberian tiga taraf dolomit, masing-masing dengan dosis 0, 12.8, dan 25.6 ton/ha, serta empat taraf abu sekam, masing-masing dengan dosis 0, 3.0, 6.0, dan 9.0 ton/ha. Setelah diberi perlakuan, tanah diinku- basi selama 40 hari. Pengamatan dilakukan terhadap tinggi tanaman, jumlah anakan, berat kering tanaman, serapan unsur P, K, Ca, Mg, dan Si oleh tanaman pada umur 64 Hari Setelah Tanam (HST), serta beberapa sifat kimia tanah, meliputi pH, Al, K, Ca, Mg dapat ditukar, P dan Si tersedia….
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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