Judul: Mempelajari pengaruh natrium benzoat terhadap daya awet santan kelapa dengan bahan pengemulsi
Abstrak: Telah diteliti penambahan CMC, tween 80 dan natrium benzoat terhadap emulsi santan kelapa untuk meningkatkan kestabilan emulsi dan daya awet santan kelapa. Santan dibuat dari daging buah kelapa dengan perbandingan antara air yang ditambahkan dengan daging buah kelapa dua dibanding satu. Kemudian ditambahkan CMC sebanyak satu persen, tween 80 sebanyak 0,2 persen serta ditambahkan natrium benzcat sebanyak 0,1, 0,2 dan 0,3 persen. Pengamatan dilakukan selang tiga hari sampai hari kesembilan terhadap kadar asam lemak bebas, pH, kadar lemak, kadar protein, kadar air dan sifat organoleptik yang meliputi bau dan warna. Rancangan percobaan yang dipergunakan adalah Rancangan Acak Lengkap Faktorial dengan ulangan tiga kali. Hasil penelitian memperlihatkan bahwa kestabilan emulsi santan dapat dipertahankan selama enam hari dengan penambahan tween 80 sebanyak 0,2 persen. Natrium benzoat dengan konsentrasi 0,3 persen merupakan perlakuan yang terbaik dalam percobaan ini, dimana setelah penyimpanan kadar lemak masih relatif tinggi (11,09 persen), Kadar asam lemak bebas yang paling rendah (1,74 persen) dan pH masih tetap tinggi (4,10). Perlakuan natrium benzoat 0,1 persen merupakan perlakuan terburuk, dimana setelah penyimpanan kadar lemak paling rendah (10,53 persen), kadar asam lemak bebas yang paling tinggi (2,19 persen) dan pH yang sangat rendah (3,50). Selama penyimpanan terjadi penurunan kadar protein dan kenaikan kadar air. Sifat organoleptik yang meliputi bau dan warna juga mengalami penurunan skor selama penyimpanan, yang berarti penurunan dalam hal mutunya.
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Judul: Mempelajari stabilitas emulsi santan kelapa (Cocos nucifera L.) terhadap proses sterilisasi
Abstrak: Telah dipelajari pengaruh perbandingan ekstraksi (be- rat daging buah kelapa: berat air = 1:1, 1:2, 1:3) terhadap beberapa sifat fisik dan kimia santan segar dan ampas kela- pa. Pada taraf uji lima persen; didapatkan kadar air, le- mak, keasaman, total padatan dan viskositas santan segar serta kadar lemak ampas kelapa dipengaruhi oleh perbanding- an ekstraksi; pH dan kadar protein santan segar serta kadar air dan kadar protein ampas tidak dipengaruhi oleh perban- dingan ekstraksi. Pada proses sterilisasi santan didapatkan bahwa bahan pengemulsi tween 60 dapat mencegah koagulasi santan pada konsentrasi 0.15% w/v dengan pH=7.0 dan perbandingan eks- traksi 1:2. Beberapa parameter telah dipelajari terhadap santan steril yang tidak terkoagulasi pada proses sterilisasi de- ngan perlakuan berat daging buah kelapa: berat air (1:1, 1:2, 1:3), konsentrasi tween 60 (0.15, 0.20, 0.25, 0.30, 0.35% w/v) dan pH (7.0, 7.1, 7.2, 7.3, 7.4). Pada taraf uji satu persen; didapatkan stabilitas relatif sangat di- pengaruhi oleh perbandingan ekstraksi, konsentrasi tween 60, pH dan interaksi antara perbandingan ekstraksi dan ...
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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