Judul: Pendugaan Simpanan Karbon pada Tegakan Api-api (Avicennia marina) di Pantai Timur Surabaya
Abstrak: Pemanasan global akibat meningkatnya gas rumah merupakan salah satu isu dan masalah penting yang sedang berkembang di berbagai negara. Salah satu upaya yang dapat dilakukan untuk menurunkan konsentrasi gas rumah kaca adalah dengan tetap menjaga hutan. Hutan mangrove merupakan salah satu jenis ekosistem hutan yang terdapat di Indonesia. Kawasan Pantai Timur Surabaya memiliki hutan mangrove yang didominsi jenis A. marina. Perhitungan simpanan karbon pada tegakan A.marina dilakukan untuk mengetahui manfaatnya yaitu menurunkan emisi gas rumah kaca. Biomassa dihitung dengan menggunakan rumus allometrik yang nantinya untuk menduga nilai simpanan karbon. Parameter yang digunakan adalah diameter setinggi dada dengan selang 6.4 cm-35 cm. Mangrove jenis A. marina memiliki kerapatan 1265 pohon/ha. Besarnya karbon total dari keseluruhan kelas diameter diperoleh 31 009.78 kg/ha, total karbon di atas permukaan tanah dari semua kelas diameter diperoleh 25 010.72 kg/ha, total karbon di bawah permukaan tanah sebesar 5999.06 kg/ha dan total serapan CO2 sebesar 113 805.89 kg/ha.
Keyword: Avicennia marina, biomassa, karbon

Judul: Pendugaan Simpanan Karbon di Atas Permukaan Lahan Pada Tegakan Akasia (Acacia mangium Willd.) di BKPH Parung Panjang KPH Bogor Perum Perhutani Unit III Jawa Barat dan Banten
Abstrak: Pemanasan global merupakan salah satu isu lingkungan, salah satu akibat yang ditimbulkannya yaitu berubahnya iklim dunia. Pemanasan global adlah dampak dari terakumulasinya gas CO2 di atmosfir sehingga menimbulkan efek rumah kaca yaitu peningkatan suhu udara bumi secara global. Mitigasi terhadap gas CO2 perlu dilakukan, salah satunya melalui rosot karbon (karbon sink). Gas CO2 di atmosfer dapat diserap oleh pohon melalui fotosintesis. Tanaman atau pohon di hutan dianggap berfungsi sebagai tempat penimbunan dan pengendapan karbon dan istilah ini disebut rosot karbon . Proses penyimpanan karbon didalam tanaman yang sedang tumbuh disebut sebagai sejuestrasi karbon (carbon seauestration). Jumlah karbon yang ditimbun dalam tanaman seperti pohon-pohonan sangat bergantung pada jenis dan sifat pohon itu sendiri. Penelitian ini bertujuan untuk mengetahui potensi simpanan karbon pada hutan tanaman Acacia mangium. Metode yang digunakan untuk menduga karbon didapat dengan menggunakan metode Vedencium Kehutanan (1976) sedangkan karbon serasah diduga menggunakan metode yang diusulkan
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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