Judul: Pengaruh Kelembaban Tanah, Pupuk N dan Pupuk P terhadap Mati Kecambah (Phytium sp.) pada Tanaman Cabai (Capsicum annum L.) Suatu Uji Rumah Kaca
Abstrak: Tujuan dari percobaan ini ialah untuk mengetahui pengaruh kelembaban tanah, pupuk N dan P terhadap mati kecambah pasca muncul yang disebabkan oleh Pytbium sp. pada tanaman cabai (Capsicum annuum L.) Percobam dilakukan di rumah kaca jurusan Ilmu Hama dan Penyakit 'Pumbuhan, Institut Pertanian Bogor. Dimulai awal Juli sampai awal September 1984. Rancangan yang digunakan adalah rancangan acak lengkap. Perlakuan disusun secara split-split plot 3x4~4, yaitu tiga taraf kelembaban tanah (30 %, 60 %, 90 96); empat taraf dosis pupuk P masing-masing 0, Kt, 80, 120 kg per hektar; dan empat taraf dosis pupuk N masing-masing 0, 50, 100, 150 kg per hektar. Kelembaban tanah ditempatkan pada petak.utama, dosis pupuk P pada anak petak dan dosis pupuk N pada an&-anak petak.
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Judul: Pengaruh pemberian bahan organik dan fungisida terhadap patogenisitas cendawan Pythium spp. penyebab rebah kecambah (damping-off) pada tanaman cabai (Capsicum annum L.)
Abstrak: Penyakit rebah kecambah (damping-off) merupakan penyakit utama yang menyerang pada pesemaian cabai. Penyebabnya adalah Pythium spp. terutama menyerang pada fase perkecambahan, yaitu pada waktu jaringan tanaman masih lemah dan biasanya menyerang pada bagian batang dekat permukaan atau di bawah permukaan tanah. Setelah terjadinya serangan patogen, batang kecambah menjadi rebah, tanaman kemudian layu dan akhirnya mati. Penelitian ini bertujuan untuk mengetahui pengaruh bahan organik dedak padi, fungisida captan dan interaksinya, terhadap patogenisitas cendawan Pythium spp. Sedangkan faktor yang diamati meliputi jumlah kecambah (umur 0- 18 hari) dan tinggi kecambah (umur 10, 12, 14 dan 16 hari) yang tumbuh, serta populasi propagul awal dan akhir patogen. Penelitian ini dilakukan di laboratorium dan rumah kaca. Bahan organik diberikan dalam empat taraf (0, 5, 20 dan 50 g/kg) dengan mencampurkan secara merata pada tanah, Perlakuan fungisida captan pada dosis 3 g/l (dosis anjuran) dan bahan organik dedak padi 5 g/kg atau 0.5% (b/b) sangat efektif dalam menekan serangan Pythium spp. Kedua pengaruh tersebut ditunjukkan oleh pertumbuhan kecambah cabai yang lebih tinggi daripada perlakuan yang lainnya setelah kecambah cabai berumur 2-3 minggu. ...
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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