Judul: Adaptasi Tiga Varietas tebu (Saccharum officinarum L.) Terhadap Kemasaman Tanah
Abstrak: Terbentuknya pola-pola seperti tersebut di atas, diduga erat kaitannya dengan perubahan reaksi-reaksi kimia dalam tanah sebagai akibat pemberian bahan kapur, yang secara langsung berpengaruh terhadap ketersediaan unsur hara dan serapannya oleh akar tanaman. Dari berbagai peubah yang diamati, cenderung terlihat adanya kesamaan tanggap pertumbuhan antara varietas PS 56 dengan BZ 132, dan untuk pertanaman di lahan masam, nampaknya kedua varietas tersebut mempunyai pertumbuhan yang lebih baik dibandingkan varietas PS 30.
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Judul: Adaptasi varietas tebu (Saccharum officinarum L.) lahan kering pada daerah beriklim basah dalam berbagai kepadatan populasi
Abstrak: Percobaan ini bertujuan untuk membandingkan adaptasi varietas atau galur harapan tebu lahan kering pada daerah beriklim basah (Bogor), dan juga ingin diketahui populasi optimumnya. Percobaan dimulai pada bulan November 1993 dan berakhir bulan Juni 1994. Percobaan dilaksanakan dengan Rancangan Petak Terbagi terdiri atas dua faktor, yaitu faktor populasi jumlah bibit sebagai petak utama, dan varietas atau galur harapan sebagai anak petak. Petak utama terdiri atas empat taraf, yaitu 2 bibit per meter juring, 4 bibit per meter juring, 6 bibit per meter juring dan 8 bibit per meter juring. Anak petak terdiri atas varietas PS 58, galur harapan PS 87-22189, dan galur harapan PS 87-22704. Satu satuan percobaan berupa satu juring sepanjang 3 meter dengan jarak dari pusat ke pusat juringan sepanjang 1.4 meter. Set percobaan diulang tiga kali. Dosis pupuk yang digunakan yaitu 1200 kg ZA/ha, 350 kg TSP/ha, dan 400 kg KCl/ha. Peubah yang diamati yaitu jumlah tunas per meter juring, panjang, lebar dan jumlah daun, tinggi tanaman, panjang tebu, jumlah ruas tebu, diameter batang, bobot per batang, bobot per meter batang, bobot tebu per meter juring, bobot nira, kadar gula reduksi, sukrosa, dan kadar gula total, jumlah sogolan, dan serangan penggerek batang serta penyakit pokahbung. Perlakuan varietas ataupun populasi tidak nyata mempengaruhi peubah kadar sukrosa dan kadar gula total varietas uji. Kadar gula reduksi PS 58 dan PS 87-22704 lebih tinggi daripada kadar gula reduksi PS 87-22189. PS 58 menghasilkan nilai yang tinggi pada peubah lebar daun, jumlah daun, bobot per batang tebu, bobot tebu per meter juring, bobot nira per batang, bobot nira per kilogram tebu, kadar gula reduksi dan bobot gula total per meter juring. PS 87-22704 menghasilkan nilai yang tinggi pada peubah panjang daun, jumlah daun, panjang batang, jumlah batang, bobot tebu permeter juring dan kadar gula reduksi. Varietas PS 58 menghasilkan bobot tebu per meter juring tinggi akibat bobot per batang tebu yang tinggi, sementara PS 87-22704 menghasilkan bobot tebu per meter juring tinggi akibat jumlah batang tebu panen yang banyak. Bobot nira perbatang PS 87-22704 cenderung lebih rendah daripada bobot nira yang dihasilkan oleh PS 58. Galur PS 87-227044 lebih toleran,..dst
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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