Judul: Pengaruh Tegangan Air Tanah dan Pemberian Kapur (CaCO3) Terhadap Dimensi Sel Serabut (Fibers) Anakan Paraserianthes falcataria (L.) Nielsen Pada Tanaman Latosol Darmaga, Bogor
Abstrak: Pada umumnya tanah-tanah di wilayah tropik basah bereaksi masam. Di Indonesia lebih dari 50% dari luasan lahan 190 juta hektar adalah masam (Satari dan Orvedal, 1968 dalam Hakim, 1982). Oleh karenanya, masalah tanah masam diantaranya adalah Podsolik dan Latosol menjadi perhatian utama para pakar di negeri ini. Dari pengalaman penelitian bertahun-tahun baik di luar negeri maupun di Indonesia sendiri, diketahui bahwa pemberian kapur ke dalam tanah masam tidak saja memper- baiki sifat kimia tanah (naiknya kadar Ca dan pH tanah) tetapi juga mempengaruhi sifat fisik dan biologi tanah. Sedangkan pengaruh kapur terhadap pertumbuhan dan produksi tanaman dapat ditinjau dari dua segi, (1) pengaruh lang- sung, yaitu kapur sebagai sumber hara Ca dan Mg, dan (2) pengaruh tidak langsung, yaitu berupa perbaikan-perbaikan sifat dan ciri tanah yang telah dikemukakan. Reaksi-reaksi kimia dalam tanah hanya berlangsung bila terdapat air. Namun tidak semua air dalam tanah dapat dimanfaatkan tanaman bagi pertumbuhannya, Adanya...dst
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Judul: Pengaruh tegangan air tanah dan pemberian kapur terhadap pertumbuhan anakan sengon (Paraserianthes falcataria (L) Nilsen pada latosol Darmaga Bogor
Abstrak: Salah satu tantangan yang harus dihadapi adalah bagaimana mengubah atau memperbaiki keadaan tempat tumbuh, baik keadaan tanah, ketersediaan unsur hara mineral maupun ketersediaan air. Kemasaman tanah mempunyai permasalahan yang berkaitan dengan pertumbuhan tanaman. Salah satu cara untuk mengatasi tanah masam yaitu pengapuran. Faktor lain yang mempengaruhi pertumbuhan tanaman adalah air. Oleh karena itu tegangan air tanah yang memungkinkan bagi tanaman untuk melakukan pertumbuhan secara optimum perlu diketahui guna mendapatkan tanaman yang berkualitas baik. Selain dari itu air berperan sebagai medium pengangkut unsur hara. Tujuan Penelitian ini adalah untuk mengetahui pengaruh tegangan air tanah dan pemberian kapur serta interaksinya pada Latosol Darmaga terhadap pertumbuhan anakan P. falcataria (L) Nielsen. Penelitian ini diharapkan untuk mendapatkan anakan yang berkualitas baik.
Keyword: kapur

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