Judul: Bioakumulasi Timbal dan Kadmium pada Keong Tutut (Filopaludina javanica) di Perairan Situ Gede Bogor
Abstrak: Keong tutut (Filopaludina javanica) merupakan gastropoda yang digemari oleh sebagian masyarakat Indonesia. Jumlah jenis keong ini sangat melimpah dengan kemampuan reproduksi dan adaptasi yang tinggi. Gastropoda merupakan grup makrozoobentos yang mampu mengakumulasi logam berat seperti timbal (Pb) dan kadmium (Cd). Akumulasi logam berat pada gastropoda dari lingkungan yang tercemar dapat membahayakan orang yang mengonsumsinya. Penelitian ini bertujuan mengukur dan membandingkan besarnya konsentrasi logam berat Pb dan Cd pada keong tutut dan sedimen di perairan Situ Gede. Pengambilan sampel dilakukan bulan Januari-Februari 2018 di Situ Gede dengan 10 titik pengambilan sampel. Sebelum diuji dengan Atomic Absorption Spectrophotometer (AAS), karakteristik morfologi keong tutut diukur dan selanjutnya daging keong tutut didestruksi. Hasil penelitian ini menunjukkan rata-rata kandungan logam berat Pb dan Cd di dalam sedimen perairan Situ Gede berturut-turut 18,62 ppm dan 0,06 ppm, sedangkan rata-rata kandungan logam berat Pb dan Cd di dalam daging keong tutut berturut-turut 0,82 ppm dan 0,11 ppm. Rata-rata kandungan logam berat Pb dan Cd tersebut belum melebihi baku mutu yang ditetapkan oleh BSN (1,5 ppm dan 1,0 ppm). Bioconcentration factor (BCF) pada daging keong tutut menunjukkan bahwa daya akumulasi logam berat Cd lebih besar dibandingkan dengan Pb. Keong tutut di Situ Gede umumnya mengakumulasi logam berat Pb dan Cd di bawah nilai baku mutu sehingga keong tutut masih dapat dikonsumsi dengan batas maksimum tertentu.
Keyword: Bioakumulasi, F. javanica, Logam berat, Situ Gede

Judul: Analisis Kandungan Logam Berat Pb dan Cd pada Keong Tutut (Bellamya javanica v.d Bush 1844) di Waduk Saguling, Jawa Barat
Abstrak: Waduk Saguling merupakan salah satu waduk yang menerima masukan air dari sungai Citarum, dimana terdapat banyak industri yang membuang limbah. Limbah tersebut diantaranya mengandung logam berat Pb dan Cd yang mencemari air, sedimen maupun biota yang terdapat di dalam waduk. Pengamatan pada keong tutut (Bellamya javanica v.d Bush 1844) diharapkan dapat memberikan informasi mengenai tingkat pencemaran logam berat di waduk tersebut. Hasil penelitian ini menunjukkan kandungan logam Pb dan Cd pada keong tutut masing- masing sebesar 14.6554 mg/kg dan 1.1086 mg/kg. Kandungan logam tersebut telah melebihi baku mutu yang ditetapkan oleh BSN-SNI 7387:2009. Indeks Faktor Konsentrasi (IFK) menunjukkan bahwa keong tutut di waduk Saguling memiliki daya akumu lasi sedang. Hasil uji ANOVA juga menunjukkan adanya tingkat akumulasi logam dan efek biologis meningkat dari daerah inlet ke daerah outlet.
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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