Judul: Pengaruh Berbagai Tingkat Kadar Air Tanah Terhadap Pertumbuhan Dan Kadar Serat Pucuk Tanaman Tebu (Saccharum Officinarum L.)
Abstrak: Tujuan penelitian ini adalah untuk mengetahui penga- ruh berbagai tingkat kadar air tanah terhadap pertumbuhan dan kadar serat pucuk tanaman tebu (Saccharum officinarum L.). Varietas tebu yang dicobakan adalah BZ-197 dan F-154 yang tahan terhadap kondisi lahan kering. Bibit berasal dari Perusahaan Gula PTP XIV Subang, Jawa Barat. Percobaan menggunakan pot dan dilakukan di rumah ka- ca. Percobaan yang dilakukan terdiri dari dua faktor, faktor pertama terdiri dari empat taraf kadar air tanah yaitu 100 persen, 90 persen, 80 persen dan 70 persen ka- pasitas lapang; dan faktor kedua terdiri dari dua varietas yaitu BZ-197 dan F-154. Percobaan menggunakan rancangan faktorial acak lengkap. Hasil penelitian menunjukkan rendahnya pertumbuhan tanaman pada keadaan kadar air tanah yang rendah. Penu- runan kadar air tanah sampai 70 persen kapasitas lapang akan menekan tinggi tanaman, jumlah daun, panjang batang, jumlah ruas batang, lingkar batang, luas daun ke tiga, bobot basah tajuk, bobot kering tajuk, bobot kering akar dan bobot basah pucuk, tetapi meningkatkan kadar bahan...
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Judul: Pengujian Beberapa Varietas Tebu (Saccharum Offi.Cinarum L .) Terhadap Cekaman Kekeringan
Abstrak: Penelitian ini dilalukan untuk mengetahui pengaruh kadar air terbadap pertumbuhan beberapa varietas tebu. Penelitian dilaksanakan di rumah kaca Balai Penelitian Tanaman Cimanggu Bogor, pada bulan April 2006 dan berakhir pada bulan Juni 2006. Penelitian ini menggunakan rancangan petak terbagi (split plot design). Petak utama merupakan kadar air yang terdiri dari tiga taraf yaitu kadar air 100%, 75% dan 50%. Faktor kedua sebagai anak petak yaitu varietas. Varietas yang digunakan adalah : (I) PS 851, (2) PS 862, (3) PS 864, (4) PS 921, (5) PS 951, (6) PS 91-787 dan (7) BL. Tiap perlakuan diulang 3 kali dan tiap unit percobaan terdiri atas 3 ember, sehingga percobaan terdiri dari 189 ember. Sebelum bibit ditanam dilakukan pengukuran kadar air. Penentuan kadar air tanah dilakukan dengan cara memberikan air pada tanah dalam polybag berlubang sehingga mencapai kapasitas lapang. Dari perhitungan diperoleb untuk KI dengan kadar air 35.83 %, K2 dengan kadar air 30.57 %, K3 dengan kadar air 26.715 %. Tanaman dipupuk dengan dosis standar yaitu 600 kg ZA, 250 kg SP- 36, dan 100 kg KCI per bektar, dan dosis tiap ember adalah 2.88 gram ZA, 1.2 gram SP-36, 0.48 gram KCL Pupuk diberikan saat tanam dan dua minggu setelah tanam.
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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