Judul: Potensi pencucian pupuk majemuk phonska serta pengaruhnya terhadap pertumbuhan dan produksi bayam Amaranthus tricolor L. pada latosol bertekstur liat darmaga dengan kandungan liat yang berbeda
Abstrak: Penelitian ini dilakukan di rumah kaca yang bertujuan untuk mengetahui potensi tingkat pencucian unsur hara NPK pupuk majemuk PHONSKA sebagai akibat perlakuan pemberian air pada tanah dengan kandungan liat yang berbeda, serta dihubungkan pula dengan pertumbuhan dan produksi bayam. Rancangan penelitian yang digunakan adalah rancangan acak lengkap faktorial, faktor ke satu adalah 81% kandungan liat (tekstur liat sangat halus) dan 51% kandungan liat P Univers (tekstur liat halus) sedangkan faktor ke dua adalah volume pemberian air (100, 120, 140, dan 160% KAKL). Hasil penelitian ini menunjukan bahwa interaksi antara kandungan liat dengan volume pemberian air berpengaruh nyata terhadap pencucian N, P, dan K pupuk PHONSKA, jumlah air tercuci, dan bobot tanaman yang dihasilkan. Pencucian tertinggi terjadi pada tanah tekstur liat halus dengan pemberian air 160 % kadar air kapasitas lapang, sedangkan pada pemberian air 100% kadar air kapasitas lapang tidak terjadi pencucian. Semakin tinggi kandungan liat dan semakin kecil volume pemberian air, maka pencucian unsur N, P, dan K semakin kecil dan produksi semakin besar.
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Judul: Pencucian Pupuk Majemuk Phonska serta Pengaruhnya terhadap Pertumbuhan dan Produksi Bayam (Anmranthzis tricolor. L) pada Inceptisol (Oxic Dyslrtidept) Darmaga dan Vertisol (Chromic Dyslrudert) Cihea.
Abstrak: Pemberian air yang melebihi kemampuan tanah menahan air ke dalam tanah perlu dipelajari untuk mendapatkan informasi mengenai pencucian (perkolasi) yang membawa unsur-unsur hara terutama N, P, K. Pencucian unsur hara merupakan salah satu kendala utama ketersediaan hara bagi tanah dan tanaman, khususnya pertumbuhan dan produksi tanaman. Faktor-faktor yang mempengaruhi pencucian hara diantaranya adalah volume pemberian air, mobilitas hara, adsorpsi tanah dan sifat tanah. Penelitian ini bertujuan untuk mempelajari pengaruh interaksi jenis tanah dan volume pemberian air terhadap pencucian hara N, P, K, pertumbuhan serta produksi bayam.
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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