Judul: Studi asam fenol tanah gambut pedalaman dari berengbengkel pada keadaan anaerob
Abstrak: Tanah gambut terbentuk dari akumulasi bahan organik pada keadaan jenuh air, sehingga proses dekomposisi bahan organik tersebut berlangsung dalam kea daan an aerob. Proses dek omposisi bahan organik dalam keadaan anaerob akan menghasilkan asam-asam organik, terutama bahan organik yang banyak mengandung lignin akan menghasilkan asamasam fenol. Asam-asam fenol bersifat racun bagi tanaman dan juga mempunyai kontribusi yang besar terhadap tingginya nilai KTK tanah gambut. Oleh karena itu penurunan kandungan asam-asam fenol pada tanah gambut mempunyai arti penting dalam pengelolaan tanah gambut sebagai lah an pertanian. Penelitian ini bertuj uan untuk mempelajari : ( 1) pengaruh pemberian arang sekam dan cu terhadap kandungan asam-asam fenol tanah gambut pedalaman Berengbengkel pada keadaan tergenang, (2) pengaruh tinggi penggenangan pada tanah gambut pedalaman Berengbengkel terhadap produksi asam-asam fenol, dan (3) pengaruh lama penggenangan pada tanah gambut pedalaman Berengbengkel te rhadap produksi asam-asam fenol. Penelitian ini dilaksanakan di Laboratorium Kimia Jurusan Tanah, Fakultas Pertanian - Institut Pertanian Bogor dan Laboratorium Biokimia Balai Penelitian Tanaman Cimanggu, yang dilakukan dalam tiga kegiatan utama, yaitu (1) analisis pendahuluan beberapa sifat kimia tanah gambut pedalaman Berengbengkel, (2) analisis komponen penyusun bahan organik tanah gambut tersebut, dan (3) analisis beberapa asam fenol yaitu asam ferulik, kumarik dan hidroksibenzoik sebagai basil proses dekomposisi bahan organik pada keadaan anaerob. Contoh tanah diambil dari Daerah Transmigrasi Berengbengkel Kalimantan Tengah. ...
Keyword: Peatsoils; Anaerobic;

Judul: Perilaku asam-asam organik meracun pada tanah gambut yang diberi garam na dan beberapa unsur mikro dalam kaitannya dengan hasil padi
Abstrak: Pengembangan lahan gambut khususnya untuk budidaya padi di satu sisi dapat menguntungkan dalam menekan kecepatan proses dekornposisi bahan gambut atau mengurangi kecepatan penurunan permukaan tanah. Namun di sisi lain dengan terciptanya kondisi anaerob maka akan terjadi akumulasi senyawa fitotoksik seperti asam-asam fenolat dan asam-asam karboksilat yang dapat meracuni tanaman padi.
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