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.
Keyword: 

Judul: Pengujian beberapa varietas tebu (Saccharum officinarum L.)
Abstrak: Percobaan yang bertujuan untuk menguji kemampuan adaptasi, produksi tebu dan hablur gula beberapa varietas tebu dengan harapan dapat menggantikan varietas-varietas unggul lama lahan kering, telah dilakukan di Kebun Percobaan Pasirbungur, di Wilayah PG Subang. Percobaan dimulai pada bulan Desember 1990 dan berakhir pada bulan September 1991. Percobaan menggunakan Rancangan Acak Kelompok (RAK) dengan tiga ulangan dan masing-masing ulangan terdiri delapan varietas. Varietas yang diuji yaitu BU 933, BV 640, BV 838, BV 5184, BV 272 dan Ps 60. Varietas-varietas tersebut merupakan varietas unggul harapan lahan kering. bagai pembandingnya (kontrol), digunakan varietas Ps 58 dan M 442-51 yang merupakan varietas unggul lama di lahan kering. Percobaan dilakukan pada petak-petak percobaan yang berukuran 108 m². Setiap petak percobaan mempunyai delapan juring dengan jarak pusat ke pusat (PKP) 1.35 m. Panjang juring adalah 10 m. Bibit tebu yang sudah berupa stek bagal dengan 3 - 4 mata ditanam dalam juringan dengan cara tanam double overlapping. Dosis pupuk yang digunakan yaitu Urea (4 ku/ha), TSP (10 ku/ha) dan KCl (4 ku/ha). Peubah yang diamati pada percobaan ini, yaitu jumlah batang per meter juring, diameter batang, panjang batang, jumlah ruas per batang, panjang ruas batang, luas daun nomor 1, hasil tebu, bobot tebu per meter batang, rendemen dan hablur gula. Percobaan menunjukkan bahwa varietas Ps 60 produksi yang nyata lebih tinggi dari varietas mempunyai kontrol. Varietas BV 640 mempunyai potensi untuk dikembangkan lebih lanjut, karena varietas tersebut juga mempunyai produksi tebu dan hablur gula yang tinggi. Oleh karena itu kedua. varietas tersebut mempunyai peluang yang besar untuk dapat menggantikan varietas-varietas unggul lama di lahan kering.
Keyword: 

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