Judul: Stusi pembiakan vegetatif stek batang Nauclea orientalis L. dan Macaranga pruinosa Muell Arg. pada tanah gambut propinsi jambi
Abstrak: Penelitian bertujuan untuk mengetahui pengaruh ukuran diameter dan panjang stek terhadap pertumbuhan stek batang dari jenis Nauclea orientalis L. dan Macaranga pruinosa Muell Arg. pada penanaman di tanah gambut. Rancangan penelitian menggunakan percobaan faktorial yang terdiri atas dua faktor dan disusun dalam Rancangan Acak Lengkap. Faktor pertama (A) adalah ukuran diameter stek yang terdiri atas dua taraf (a1 = 1-2 cm dan a₂ = 2-3 cm), sedangkan faktor kedua (B) adalah ukuran panjang stek yang terdiri atas tiga taraf (b₁ = 30 cm, b₂ = 40 cm, b3 50 cm). Respon yang diukur adalah persen bertunas (persen hidup), persen berakar, waktu mulai bertunas, waktu mulai berakar, jumlah tunas, jumlah akar, panjang akar, berat kering tunas dan berat kering akar.
Keyword: Nauclea orientalis L.

Judul: Studi pembiakan vegetatif stek batang jelutung (Dyera costulata Hook. f.) dengan penambahan zat pengatur tumbuh rootone F pada media kombinasi gambut dan top soil di HTI-Trans PT. Rimba Rokan Hulu Riau
Abstrak: Jelutung (Dyera costulata Hook. f) merupakan jenis tanaman alternatif yang potensial untuk dikembangkan di Hutan Tanaman Industri (HTI) dan Hutan Tanaman Rakyat (HTR). Jenis ini mempunyai volume kayu yang sangat besar, Kayunya bisa digunakan sebagai bahan baku industri Plywood dan woodworking. Jelutung menghasilkan hasil hutan non kayu berupa getah, yang biasanya digunakan untuk bahan baku permen karet dan kosmetika. Penelitian ini bertujuan untuk mengetahui pengaruh perlakuan pemberian zat pengatur tumbuh Rootone F, kombinasi media tumbuh dan variasi panjang stek terhadap pertumbuhan. stek batang Jelutung (Dyera costulata Hook. f.) Penelitian ini dilakukan dengan menggunakan rancangan percobaan faktorial 6 X 3 X 3 dalam pola acak lengkap dengan ulangan masing-masing sebanyak tiga kali. Faktor pertama. adalah konsentrasi zat pengatur tumbuh Rootone F (A) dengan taraf perlakuan al kontrol, al 40 Mg/stek, a2 = 80 Mg/stek, a3- 120 Mg/stek, a4 160 Mg/strek dan a5 200 Mg/Stek. Faktor kedua adalah Kombinasi media gambut dan top soil (B), dengan taraf perlakuan bo top soil saja, bi gambut top soil dengan perbandingan volume 1 1 dan b2 = gambut top soil dengan perbandingan volume 1: 2. Faktor ketiga adalah variasi ukuran panjang stek (C), dengan taraf perlakuan co Panjang stek 20 Cm, c1 panjang stek 30 Cm dan c2 panjang stek 40 Cm.. Parameter yang diukur adalah waktu mulai bertunas, persen stek bertunas, jumlah tunas, berat kering tunas, persen stek berakar, panjang akar, jumlah akar dan berat kering akar. Untuk mengetahui pengaruh perlakuan terhadap parameter tersebut dilakukan uji F dan dilanjutkan dengan uji beda rata-rata Duncan.
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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