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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Sistem Informasi Kaputama (JSIK)
Rio Andika
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Computer Science & IT Engineering

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Pengaruh Waktu Ageing Dan Kecepatan Pengadukan Pada Sintesis Hidroksiapatit Dari Cangkang Telur Dengan Metode Presipitasi Rio Andika; Ahmad Fadli; Irdoni HS
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Hydroxyapatite (HAp) is one of the calcium phosphate compounds are used as biomaterials because of the ceramic material which has a stable properties. The purpose of this study is to study the effect of ageing time and stirring rate of the HAp obtained. HAp from eggshells has been successfully synthesis using precipitation method with variation of ageing time and stirring rate. Eggshells were calcined at 1000 oC for 5 hours to produce calcium oxide (CaO). CaO was dissolved into nitric acid (HNO3) to obtain (Ca(NO3)2), and then mixed slowly into a diamonium hydrogen phosphate solution which was already dissolved into aquabidest. After mixing process is complete, the solution was settling with the variation of ageing time 0 hour, 12 hours, 36 hours and 48 hours and the best condition continued in the second variation of the stirring rate 200 rpm, 250 rpm, 350 rpm and 400 rpm. HAp produced at the ageing time 12 hours is the optimum condition. Bonds of PO43- and OH- shown HAp compounds, also it contained tricalcium phosphate (TCP) and calcium hydroxide (Ca(OH)2) compounds. Morphology of HAp particles had a granular form with a increasing particle size of HAp with the ageing time in the range 60-48 nm, whereas the faster rate of stirring had been produced the particle in the range 47-44 nm.Keywords: ageing time; eggshells, hydroxyapatite; mixing; precipitation
Penerapan Super Enkripsi Algoritma Autokey Cipher dan El-Gamal File Gambar Rio Andika; Rizky Fajar Sitepu; Putri Ramadhani; Rizka Nova Fitria; Achmad Fauzi
Jurnal Sistem Informasi Kaputama (JSIK) Vol. 9 No. 1 (2025): Volume 9, Nomor 1, Januari 2025
Publisher : STMIK KAPUTAMA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59697/jsik.v9i1.957

Abstract

Autokey Cipher is a classic encryption technique that uses substitution methods, providing a higher level of security compared to other classical techniques such as Caesar and Vigenère ciphers. It generates keys that match the length of the plaintext, ensuring that each character of the original data has a corresponding key character, which is crucial for effective encryption.on the other hand, the ElGamal algorithm is an asymmetric encryption method that uses different keys for encryption and decryption, relying on prime numbers and discrete logarithms to secure messages. This algorithm was chosen because of its strong security features, making it difficult for unauthorized users to decrypt information without the right key. The combination of these two algorithms aims to create a more secure encryption system. Autokey Cipher contributes complex substitution techniques, while ElGamal adds an additional layer of security through an asymmetrical key structure. This dual approach is very beneficial for protecting sensitive data, such as image files, from unauthorized access. highlighting the potential of these combined methods to provide stronger defenses against a wide range of security threats in the digital landscape
Co-Authors ACHMAD FAUZI Ahmad Fadli Irdoni HS Putri Ramadhani Rizka Nova Fitria Rizky Fajar Sitepu