Judul: Bangkitan debu jatuh dan partikel tersuspensi total (TSP) dari tanah Regosol dan kompleks Mediteran Merah-Kuning dan Grumusol
Abstrak: Bangkitan debu jatuh dan TSP berasal dari partikel tanah yang mengalami erosi oleh angin (Aeolian). Penelitian ini bertujuan untuk mengukur dan menganalisis bangkitan debu jatuh dan TSP serta korelasinya dengan kecepatan angin, kadar air tanah, dan tutupan vegetasi pada tanah Regosol dan Kompleks Mediteran Merah-Kuning dan Grumusol (KMG) sesuai dengan SNI 13-4703-1998 dan SNI 19-7119.3-2005 menggunakan metode gravimetri. Analisis tekstur tanah dilakukan dengan metode hidrometer yang mengacu pada USDA. Hasil penelitian menunjukkan bangkitan debu jatuh dan TSP berkorelasi positif dengan kecepatan angin dan berkorelasi negatif dengan kadar air tanah dan tutupan vegetasi. Bangkitan debu jatuh pada kedua jenis tanah melebihi baku mutu PP No 41/1999 tentang Pengendalian Pencemaran Udara untuk daerah pemukiman (10 ton/km-/bulan), yaitu sebesar 26 ton/km²/bulan untuk Regosol dan 17 ton/km²/bulan untuk KMG. Bangkitan TSP yang terjadi sebesar 83 µg/Nm³ pada tanah Regosol dan 109 µg/Nm³ pada tanah Kompleks Mediteran Merah-Kuning dan Grumusol (KMG) dan tidak melebihi baku mutu yang ditetapkan (230 µg/Nm³). Faktor emisi debu jatuh dan partikel tersuspensi total dipengaruhi oleh kecepatan angin, tutupan vegetasi dan kadar air tanah basis volume…
Keyword: Complex red-Yellow Mediteran and Grumusol, Dustfall, Regosol, Total Suspended Particulate, Debu jatuh, USDA, Hydrometer

Judul: Pemodelan bangkitan debu jatuh dan TSP dari tanah podsolik merah-kuning dan kompleks podsolik merah-kuning, latosol, dan litosol
Abstrak: Debu jatuh (dustfall) dan total suspended particulate (TSP) merupakan contoh pencemar di udara yang membahayakan kesehatan manusia. Bangkitan TSP dan debu jatuh pada jenis tanah yang berbeda akan menghasilkan nilai yang berbeda. Penelitian mengenai pemodelan bangkitan debu jatuh dan TSP dilakukan pada jenis tanah podsolik merah-kuning dan kompleks dari tanah podsolik merah- kuning, latosol, dan litosol, yakni korelasi antara bangkitan debu jatuh dan TSP terhadap kecepatan angin, kadar air tanah, dan tutupan lahan. Tujuan penelitian ini adalah: (1) mengukur bangkitan debu jatuh dan TSP pada kecepatan angin dan kadar air tanah yang bervariasi; (2) menganalisis korelasi antara bangkitan debu jatuh dan TSP terhadap kecepatan angin, kadar air tanah, dan tutupan lahan dan (3) membuat model pendugaan bangkitan debu jatuh dan TSP berdasarkan kecepatan angin, kadar air tanah, dan tutupan lahan. Penelitian dilakukan di tunnel Departemen Teknik Sipil dan Lingkungan, IPB. Pengukuran bangkitan konsentrasi TSP dilakukan dengan metode gravimetrik (SNI19-7119.3-2005). Hasil analisis menunjukkan bahwa bangkitan debu jatuh dan TSP berkorelasi positif terhadap kecepatan angin dan berkorelasi negatif terhadap kadar air tanah dan tutupan lahan Pengaruh dari parameter kecepatan angin 50.6% - 99.9%, sedangkan untuk kadar air sebesar 76.3-99.9%, dan 77.6-99.7% untuk tutupan lahan…
Keyword: Complex of red-yellow podzolic latosol and litosol, Dustfall, Red-yellow podzolic, Total suspended particulate, Dust fail, Total suspended particulated, Air quality, Human health, Soil types, Soil moisture, Land cover

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