Judul: Pengaruh bahan pemantap tanah (Soil Conditioner) terhadap beberapa sifat fisik dan penetrasi akar padi gogo IR-36 pada tanah podsolik merah kuning (Typic Humitropept) dari Jasinga
Abstrak: Tujuan Penelitian ini adalah untuk mengamati pengaruh bahan pemantap tanah (soil conditioner) terhadap sifat- sifat fisik tanah, seperti bobot isi, distribusi ukuran pori, Angka Atterberg, nilai COLE, kemantapan agregat, dan kekuatan tanah, serta melihat pengaruhnya terhadap penetrasi akar Padi Gogo IR-36. Percobaan dilakukan di Rumah Kaca, Jurusan Tanah pada akhir Oktober 1987 akhir Januari 1988. Analisis sifat fisik tanah dilakukan di Laboratorium Fisika Tanah, Jurusan Tanah, Fakultas Pertanian, IPB; dan Laboratorium Konservasi Tanah dan Air, Pusat Penelitian Tanah. Analisis sifat ini dimulai dari awal Februari sampai April 1988. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap. dijelaskan sbb: Perlakuan bahan pemantap tanah dapat a (kontrol), b (S1 Semen dengan dosis 2 ton/ha), c (S2 = Semen dengan dosis 7 ton/ha), d (21 = Zeolit dengan dosis 15 ton/ha), e (Z2 = Zeolit dengan dosis 30 ton/ha), ₤ (K1 Sampah kota dengan dosis 10 ton/ha), g (K2 = Sampah kota dengan dosis 15 ton/ha), h (P1 = Kotoran ayam dengan dosis 10 ton/ha), i (P2 = Kotoran ayam dengan dosis 15 ton/ha). Jumlah perlakuan seluruhnya sebanyak 9 perlakuan. Percobaan ini diulang 3 kali, sehingga jumlah keseluruhan satuan percobaan 27 buah. Pemberian bahan pemantap tanah tidak nyata mempengaruhi bobot isi, pori drainase sangat cepat dan lambat, air tersedia, aerasi tanah, kekuatan tanah, dan penetrasi akar Padi Gogo IR-36. ...
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Judul: Pengaruh soil conditioner, pengapuran dan tanaman jagung terhadap beberapa sifat fisik tanah podsolik merah kuning dari jasinga
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh soil conditioner, pengapuran, dan tanaman jagung serta interaksinya terhadap beberapa sifat fisik tanah Podsolik Merah Kuning. Hasil penelitian ini diharapkan dapat dimanfaatkan sebagai bahan informasi dalam penelitian lebih lanjut tentang penggunaan soil conditioner untuk tanah-tanah di Indonesia. Percobaan dilakukan di kamar kaca dengan menggunakan pot plastik. Senyawa polimer polyvinil alcohol (PVA) di- pakai sebagai soil conditioner, kalsium karbonat (CaCO3). sebagai bahan pengapuran, dan tanaman jagung varietas Hi- brida IPB II (19 x 16) sebagai tanaman uji. Kerusakan tanah akibat erosi akan lebih parah jika pemanfaatan tanah tidak mengenal kaedah-kaedah pengawetan tanah. Kerusakan tanah akibat erosi dapat ditekan dengan jalan memperbaiki sifat fisik tanah, seperti kemantapan agregat dan porositas tanah. Polyvinil alcohol (PVA) dengan dosis 0.30 persen cenderung meningkatkan porositas total, air tersedia, dan kemantapan agregat; sedangkan terhadan bebot isian ruang pori drainase cepat/lambat berakibat menurunkan. Pengaruhnya terhadap bobot jenis partikel tidak nyata. Pengapuran dengan dosis 20.22 ton CaCO3/ha cenderung menurunkan bobot isi dan ruang pori drainase lambat, tetapi meningkatkan porositas total dan indeks stabilitas agregat. Tanaman jagung mengakibatkan jumlah air tersedia dan dan indeks stabilitas agregat lebih besar bila dibandingkan dengan perlakuan yang tidak ditanami jagung.
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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