Judul: Kinetika Produksi Gas dan Kecernaan in Vitro Pakan dengan Penambahan Mineral Organik Hasil Inokulasi dengan Saccharomyces cerevisiae dan Suplementasi Hijauan Bertanin
Abstrak: This research was aimed to observe the effect of organic micromineral, tanniniferous forage and its combination supplementation to gas production and in vitro digestibility.This research used king grass (Pennisetum hybrid) as control, leaves of neem (Azaditachta indica) as tanniniferous forage and monensin as antibiotic. A completely randomized design was applied to this research by using 7 treatments with 3 replications. Variables observed were physical quality of fermented feed, in vitro digestibility, number of protozoa, production of ammonia (NH3), concentration of methane (CH4), production of VFA, and gas production. The treatments were: P (P. hybrid), PO (P. hybrid + organic mineral 3%), POA (P. hybrid + organic mineral 3% + A. indica 2%), PM (P. hybrid + inorganic mineral 3%), PMA (P. hybrid + inorganic mineral 3% + A. indica 2%), PA (P. hybrid + A. indica 2%), PMO (P. hybrid + monensin 40 ppm). Results showed that inorganic mineral supplementation (PM) decreased digestibility of dry matter, i.e. from 63.95% to 32.14% (P<0.001). Organic mineral supplementation (PO) and inorganic mineral + A. indica (PMA) increased butyric acid production from 17.93 mM to 28.09 and 25.89 (P<0.01), respectively. Organic mineral supplementation + A. indica (POA) decreased total gas production from 45.37 to 41.55 ml (P<0.01). It can be concluded that organic mineral supplementation only affected butyric acid production and decreased total gas production when added with tanniniferous forage.
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Judul: Evaluation of the Addition Premix Combination of Methane Inhibitor, Mineral Mix, and Probiotics in Ruminant in Vitro
Abstrak: Penelitian ini bertujuan untuk mengevaluasi premix kombinasi dengan campuran methane inhibitor berupa tanin, mineral mix, dan probiotik terhadap kecernaan, fermentabilitas, dan pengukuran gas metana. Penelitian ini menggunakan Rancangan Acak Kelompok dengan 12 perlakuan dan 5 ulangan. Variabel yang diamati adalah pH rumen, produksi gas total, produksi gas metana, kecernaan bahan kering, kecernaan bahan organik, dan N-NH3. Semua perlakuan menggunakan tanin cair kecuali L0 = tanpa penambahan dan L6 = dengan penambahan probiotik saja. Data dianalisis menggunakan analysis of variance (ANOVA) dan hasil yang signifikan (P<0,05) diuji lebih lanjut menggunakan uji kontras. Hasil penelitian menunjukkan bahwa penambahan tanin cair, probiotik, dan mineral organik berpengaruh nyata terhadap pH rumen, produksi total gas, produksi gas metana, kecernaan bahan kering, kecernaan bahan organik, dan N NH3. Kesimpulan dari penelitian ini adalah penambahan tanin cair, probiotik, dan tembaga akan menurunkan produksi gas total, produksi gas metana, kecernaan bahan kering, kecernaan bahan organik, dan N-NH3., This study aimed to evaluate the premix combo with a mixture of methane inhibitors in the form of tannin, mineral mix, and probiotics on digestibility, fermentability, and measurement of methane gas. This study used randomized block design with 12 treatments and 5 replications. The observed variables were rumen pH, gas total production, methane gas production, dry matter digestibility, organic matter digestibility, and N-NH3. All of the treatments were used liquid tannin except for L0 = without addition and L6 = with additions probiotic only. Data were analyzed using analysis of variance (ANOVA) and significant results (P<0.05) were further tested using contrast’s test. The results showed that the addition of liquid tannin, probiotic, and organic mineral (Fe, Mn, Cu) had a significant effect on rumen pH, gas total production, methane gas production, dry matter digestibility, organic matter digestibility, and N-NH3. The conclusion of the research was the addition of liquid tannin, probiotic, and Cuprum would decrease total gas production, methane gas production, dry matter digestibility, organic matter digestibility, and N-NH3.
Keyword: digestibility, fermentability, organic mineral, probiotic, tannin

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