Judul: Pengaruh Tingkat Penggenangan dan Naungan Terhadap pertumbuhan Durian (Durio zibethinus L.) pada Media Gambut di Persemaian.
Abstrak: Permasalahan utama lahan gambut adalah kandungan pH yang rendah serta lahannya mudah terbakar saat musim kemarau dan banjir saat musim penghujan. Adanya faktor pembatas tersebut mengakibatkan hanya beberapa jenis tanaman yang toleran pada lahan gambut. Tujuan penelitian ini adalah mengkaji pengaruh perlakuan genangan dan naungan terhadap pertumbuhan durian (Durio zibethinus) pada media dan air gambut. Penelitian ini menggunakan Rancangan Faktorial Acak Lengkap (RAL) dengan 2 faktor perlakuan, yaitu genangan dan naungan. Hasil penelitian ini menunjukkan bahwa interaksi pengaruh genangan dan naungan berpengaruh nyata pada beberapa peubah seperti diameter, berat basah total, berat kering total, nisbah pucuk akar, klorofil dan laju fotosintesis. Durian tumbuh optimal pada naungan 0-30% dengan kondisi tanpa genangan.
Keyword: Durio zibethinus, genangan, laju fotosintesis, naungan

Judul: Pengaruh paklobutrazol dan mulsa-drainase terhadap pertumbuhan dan pembungaan durian (Durio zibethinus Murr)
Abstrak: Percobaan ini bertujuan untuk mengetahui pengaruh dosis paklobutrazol dan mulsa-drainase terhadap pertumbuhan dan pembungaan durian. Percobaan dilaksanakan dari bulan Februari 2002 sampai dengan bulan Februari 2003 di Kebun Percobaan IPB Tajur, Bogor pada ketinggian tempat ± 250 meter di atas permukaan laut. Percobaan menggunakan rancangan acak lengkap (RAL) dua faktor dengan tiga ulangan. Faktor pertama adalah dosis paklobutrazol yang terdiri atas 0 g, 5 g, 10 g, dan 15 g. Faktor kedua adalah perlakuan mulsa-drainase yaitu perlakuan tanpa mulsa- drainase dan perlakuan dengan mulsa-drainase. Satu unit perlakuan terdiri dari satu pohon durian. Perlakuan paklobutrazol diberikan dengan menyiramkan larutan paklobutrazol sesuai dengan dosis yang ditentukan ke sekeliling lingkar tajuk pohon. Mulsa-drainase diaplikasikan dengan membuat saluran-saluran drainase yang mengkotaki areal pertanaman, kemudian permukaan tanah pada area pertanaman ditutup dengan plastik mulsa hitam perak. Hasil percobaan menunjukkan bahwa paklobutrazol menghambat pertambahan jumlah ruas dan daun tunas terminal, menghambat pemanjangan tunas lateral dan menghambat penambahan jumlah daun tunas lateral. Pemanjangan tunas terminal nyata dipengaruhi oleh kombinasi paklobutrazol dengan mulsa-drainase. Jumlah tunas lateral tidak dipengaruhi oleh paklobutrazol, mulsa-drainase dan interaksinya. Perlakuan paklobutrazol menyebabkan pembungaan durian. Perlakuan mulsa-drainase meningkatkan jumlah tunas bunga, kuntum bunga dan buah durian. Kombinasi 15 g paklobutrazol dengan mulsa-drainase menghasilkan jumlah tunas bunga, kuntum bunga dan buah terbanyak.
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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