Judul: Pengaruh salinitas terhadap kuantitas dan kualitas makanan alami serta produksi biomasa nener bandeng
Abstrak: Penelitian ini dilakukan dari pertengahan April sampai akhir Juni 1984, bertempat di Unit Tambak Percontohan Karanganyar Semarang, Jawa Tengah. Tujuannya ialah untuk : ( 1) mengetahui pengaruh salinitas terhadap kuantitas dan kualitas makanan alami serta tingkat pemanfaatannya oleh nener, (2) mengetahui pengaruh salinitas terhadap kelangsungan hidup, laju pertumbuhan dan produksi biomasa nener, (3) menentukan tingkat salinitas optimum bagi respons maksimum pertumbuhan dan produksi biomasa nener. Untuk mencapai tujuan penelitian dilakukan dua percobaan yang dilaksanakan bersamaan, menggunakan rancangan acak lengkap (RAL) dengan tiga ulangan. Percobaan pertama, tanpa ikan (TI), ditujukan untuk mempelajari pengaruh salinitas terhadap kuantitas dan kualitas makanan alami. Percobaan kedua, dengan ikan (DI), ditujukan untuk menelaah pengaruh salinitas terhadap ( 1) makanan alami yang dipengaruhi "grazing" nener, ( 2) tingkat pemanfaatan makanan alami oleh nener, (3) kelangsungan hidup, pertumbuhan dan produksi biomasa nener.
Keyword: quantity

Judul: Pengaruh berbagai densitas populasi ikan belanak Liza subviridis valenciennes terhadap produksi biomasa ikan bandeng dalam tambak
Abstrak: Penelitian ini dilakukan sejak akhir Oktober 1985 sampai dengan awal April 1986 di Unit Tambak Percontohan Karanganyar, Semarang. Penelitian bertujuan untuk mengkaji pengaruh tingkat kepadatan ikan belanak terhadap produksi biomasa ikan bandeng di tambak. Untuk mencapai tujuan tersebut maka dilakukan dua percobaan yaitu untuk : ( 1) menentukan padat tebaran optimal ikan bandeng ukuran glondongan yang ctapat dicapai, terhadap klekap yang turnbuh dan (2) mengkaji pengaruh taraf tebaran ikan belanak terhadap produksi biomasa ikan bandeng. Kedua percobaan menggunakan Rancangan Acak Lengkap dengan lima perlakuan dan tiga ulangan. Kedua percobaan dilakukan secara berturutan pada petak tambak yang Sama. Petak tambak disekat menggunakan jaring nylon untuk mendapatkan petak percobaan berukuran 5 x 4 x 1 m, kecuali petak kontrol makanan alami berukuran 1 x 1 x 1 m. Pengelolaan tambak dan penumbuhan makanan alami didasarkan pada metoda klekap yang dianjurkan oleh BBAP (Balai Budidaya Air Payau) Jepara. Taraf tebaran ikan bandeng pada percobaan pendahuluan ialah 15, 20 25, 30 dan 35 elrnr per petak. Dari penelitian pendahuluan diketahui bahua padat tebaran optimal ikan bandeng ukuran glondongan adalah 30, 22 ekor per petak. ...
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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