Judul: Produktivitas rumput gajah (Pennisetum purpureum) di Peternakan ternak domba sehat caringin Bogor sebagai respon pemupukan organik dan nitrogen
Abstrak: The objective of the experiment was to recognize the effect of the.0rgan.c fertilizer (sheep manure) and the anorganic fertilizer (urea) on grass productivity in T e d Domba Sehat Farm Caringin-Bogor. Factorial Completely Randomize Design consisted of two factors by three replications was used in this experiment. First factor consisted of four level of urea (0, 50, 100, and 150 kgha). Second factor are sheep man= fertilizer (0, 10, 15, and 20 tonha). Data was statistically anahzed usiiig ANOVA. When it indicated a significant effect (P<O.O5), the Least Significant Difference was used. Result of research indicated that organic manure ( 10, 15, and 20 tonha) increased production if compared with urea. The addition of manure fertilizer (10, 15, dan 20 tonlha) gave the same effect as those of urea treatment for raising biomassa production. The k t of manure fertilizer (20 tonha) gave the highest 391.4% dry matter production of grass.
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Judul: Effect of Lime and Cow Dung on Soil Chemical Properties for Growth and Production of Napier Grass (Pennisetum purpureum)
Abstrak: Upaya meningkatkan produksi sapi potong adalah dengan cara memperbaiki pakan ternak. Kondisi lahan yang kurang subur menjadi pembatas untuk mendapatkan sumber pakan hijauan. Maka, diperlukan hijauan yang memiliki produktivitas tinggi dan mampu tumbuh pada berbagai jenis lahan seperti rumput gajah. Lahan di Bangka Belitung umumnya terdiri atas lahan kering yang mempunyai tingkat kesuburan tanah yang rendah. Usaha meningkatkan kesuburan tanah dapat dilakukan melalui pengapuran dan pemupukan. Penelitian ini bertujuan untuk mengetahui pengaruh kapur dan pupuk kandang sapi (pukan) terhadap sifat kimia tanah serta pertumbuhan dan produksi rumput gajah. Percobaan ini merupakan percobaan faktorial dua faktor yang ditempatkan dalam rancangan acak kelompok (RAK). Faktor pertama adalah kapur dengan dua taraf, yaitu tanpa kapur (K0) dan kapur 3 ton/ha (K1). Faktor kedua adalah pukan dengan empat taraf, yaitu: tanpa pukan (P0), pukan 10 ton/ha (P1), pukan 20 ton/ha (P2), dan pukan 30 ton/ha (P3). Sifat kimia tanah yang diamati yaitu pH, C-organik, N-total, KTK, Ca dd, Mg dd, K dd, P tersedia, dan hara mikro (Fe, Mn, Cu, dan Zn) tersedia. Parameter pertumbuhan dan produksi yang diamati adalah tinggi tanaman, jumlah anakan, bobot basah, dan bobot kering. Hasil penelitian menunjukkan bahwa kapur 3 ton/ha (K1) mampu meningkatkan nilai pH, KTK, Ca dd, Mg dd, dan P tersedia. Pukan dapat meningkatkan C-organik, KTK, Ca dd, Mg dd, P tersedia, Fe dan Zn tersedia. Pukan, kapur, dan interaksinya berpengaruh nyata terhadap tinggi tanaman dan jumlah anakan, namun terhadap bobot basah dan bobot kering hanya pukan dan kapur yang berpengaruh nyata, sedangkan pengaruh interaksinya tidak nyata. Semakin banyak pukan yang diberikan, semakin baik pertumbuhan dan produksi rumput gajah., Improving animal feed is increased the production of beef cattle. The condition of the soil that was less infertile, as a barrier to getting forage sources of feed. So, we need forages that have high productivity and can grow on various types of land, such as napier grass. Bangka Belitung’s land consisted of dry land that has a low level of soil fertility. It can be increased by liming and fertilizing. This study aimed to determine the effect of lime and cow dung on the chemical properties for soil, growth and production of napier grass. This experiment was two-factor factorial experiment that consisted of two level of lime: without lime (K0) and lime 3 ton/ha (K1); and 4 levels of cow dung: 0 ton/ha(P0); 10 ton/ha (P1); 20 ton/ha (P2); and 30 ton/ha (P3). These treatment were replicate three times and arranged in a randomized complete block design (RCBD). The chemical properties of the soil observed were pH, organic C, total N, CEC, exchangeable base (Ca, Mg, K), available P, and available micronutrients (Fe, Mn, Cu, and Zn). The parameters of growth and production observed were plant height, number of tillers, wet weight, and dry weight. The results showed that lime 3 tons/ha (K1) increased soil pH, CEC, exchangeable Ca and Mg and there was P in it. Cow dung increased C-organic, CEC, exchangeable Ca and Mg, and there were P, Fe, and Zn in it. Cow dung, lime, and their interactions had a significant effect on plant height
Keyword: animal feed, cow dung, lime, napier grass, soil fertility

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