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All Journal JIK Jurnal Ilmu Komputer Majalah Ilmiah Pengkajian Industri Metalurgi Makara Journal of Technology Metalurgi
Marzuki Silalahi
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Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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ULTRASONIC TREATMENT EFFECT ON THE CONSOLIDATION OF Fe-Cr PARTICLE MIXTURES AFTER COMPACTION AND SINTERING PROCESS Silalahi, Marzuki; Untoro, Pudji; Suharno, Bambang; Harjanto, Sri
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.765 KB) | DOI: 10.14203/metalurgi.v29i2.289

Abstract

ULTRASONIC TREATMENT EFFECT ON THE CONSOLIDATION OF Fe-Cr PARTICLEMIXTURES AFTER COMPACTION AND SINTERING PROCESS. Fe-Cr microalloys which obtained byultrasonic method are the initial cores for the consolidation process. Therefore its facilitate the formation of thehomogeneous bulk of Fe-Cr alloy with a stable phase. In this research, the synthesis of bulk of Fe-Cr alloy fromthe particles mixture of (Fe+Cr) as the ultrasonic treatment results has been carried out. The particlesconsolidation has been carried out through a process of compaction without adding any lubricants and followedby sintering process in the quartz glass capsules by using induction furnace at 1300 °C. Consolidation of mixtureof Fe-Cr particles that have not undergone previous ultrasonic treatment is also made for a comparison. Theinvestigation by using the SEM (scanning electron microscope)- and density measurements method werepreformed on the Fe-Cr green powders compaction. The bulk of Fe-Cr alloys that are produced trough sinteringprocess was observed using SEM-EDS (energy dispersive spectroscopy), XRD (x-ray diffraction), and densitymeasurements method. The bulk of Fe-Cr alloy prepared with ultrasonically treated Fe-Cr microalloy powders,is more homogeneous in composition and has a better phase stability in comparison to Fe-Cr powders preparedwithout the ultrasonic treatment. Production of bulk Fe-Cr alloy in quartz glass capsule during the sinteringprocess has produced Fe-Cr alloy without oxides.
THE SYNTHESIS OF PBZR0.52TI0.48O3 AND PBZR0.58TI0.42O3 CERAMIC POWDER BY USE MOLTEN SALT METHOD AND ITS INTERMEDIATE PRODUCT ANALYSIS Ahda, Syahfandi; Mardiyanto, Mardiyanto; Taufiq, Agus; Silalahi, Marzuki
Majalah Ilmiah Pengkajian Industri Vol 13, No 3 (2019): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (360.246 KB) | DOI: 10.29122/mipi.v13i3.3617

Abstract

Lead zirconat titanate, Pb(Zr1-x,Tix)O3 is a material with high piezoelectric properties and many studies have been carried out in development, in order to improve the materials quality in various applications. Therefore,one of them is the development of synthesis with the molten salt method in this study. Choice of the molten salt method is simply and and not expensive. The salt ratio of NaCl / KCl at 1: 1 in moles as a solvent medium was carried out in synthesizing Pb(Zr1-x,Tix)O3. Likewise, the salt ratio with reactant/basic material was 1: 1 in weight percentages. An intermediate product is obtained if the dynamics of chemical reactions in the diffusion process occur indirectly or in stages. To identify intermediate products in this synthesis process, the sintering temperature has been varied to 575, 675 and 775 oC for samples A, B and C, respectively. The results of these syntheses have been identified and characterized using x-ray diffraction (XRD) methods. The Highscore program using the Rietveld method to identify the intermediate product content and each crystal structure has been applied in the rifenement process on the XRD intensity profile with a statistical error of less than 6%. Intermediate products have been obtained as follows, PbTiO3, PbZrO3 and Zr0.4Ti0.6O3. Whereas sample C has obtained two phases namely PbZr0.52Ti0.48O3 and PbZr0.58Ti0.42O3 with tetragonal (P4mm) and rhombohedral crystal structures (R3c).
Perancangan Program Aplikasi Kriptografi Menggunakan Algoritma Mars Dengan Modus Ecb Silalahi, Marzuki; P., Tumpal; Deby, Deby
JIK: Jurnal Ilmu Komputer Vol 5, No 1 (2007)
Publisher : Lembaga Penerbitan Universitas Esa Unggul

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47007/komp.v5i1.430

Abstract

Salah satu cara yang digunakan untuk pengamanan data adalah menggunakan sistem kriptografi. Namun sejalan dengan perkem-bangan ilmu penyandian atau kriptografi, usaha-usaha untuk memperoleh kunci tersebut dapat dilakukan oleh siapa saja, termasuk pihak yang tidak sah untuk memiliki informasi tersebut. Melalui perancangan ini, akan dibahas mengenai kriptografi menggunakan algoritma MARS dengan modus ECB. MARS sebagai salah satu kandidat AES, memiliki kelebihan mempunyai keamanan dan kecepatan yang tinggi. Hal ini menjadikan MARS sebagai pilihan terbaik untuk enkripsi yang diperlukan oleh dunia informasi menuju abad berikutnya. Algoritma MARS menggunakan kunci 128 bit dan proses enkripsinya terdiri dari 32 round. Waktu proses enkripsi pada algoritma ini berjalan pada 85 Mbit per detik. Perancangan program ini juga menyediakan unit sarana pengiriman file, baik untuk file yang telah dienkripsi maupun jenis file biasa. Namun ruang lingkup pengirimannya terbatas pada jaringan Local Area Network. Pengujian telah dilakukan dan program MARS ini dapat dijamin dan dipercaya keamanannya.Kata Kunci: Kriptografi, MARS, Modus ECB
Perancangan Program Aplikasi Kriptosistem Menggunakan Algoritma Square Yang Dimodifikasi Dan Fungsi Hash Sha-1 Silalahi, Marzuki; P., Tumpal; Susanti, Herlina
JIK: Jurnal Ilmu Komputer Vol 4, No 2 (2006)
Publisher : Lembaga Penerbitan Universitas Esa Unggul

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47007/komp.v4i2.425

Abstract

Security and confidentiality of data or information has become an important issue within each person or in an organization. Especially, if this concerned data  is in a computer connected with public network, such as LAN. The data will be vulnerable of computer crime done by unauthorized person. This article will discussed about designing a cryptographic application by using a combination between symmetric algorithm SQUARE and hash function SHA-1, to provide not only security but also authenticity in message delivery through network. Symmetric algorithm SQUARE with 128 bits key length will provide security of message delivery through network, by encrypting the message into an incomprehensible form, so it can not be accessed by unauthorized person, only by the one who also knows  the key. While using a hash algorithm SHA-1 (Secure Hash Algorithm), user can produce message digest and use it as a digital signature of the message which provide authenticity, by then user will know if the message is really come from a trusted person.Keywords: Cryptosystem, SQUARE, SHA-1, Message Authentication, Conventional Encryption, Computer Security, Digital Signature, Hash Algorithm, Symmetric-Key Algorithm, Public-Key Encryption.
LOGIKA FUZZY METODE MAMDANI DALAM SISTEM KEPUTUSAN FUZZY PRODUKSI MENGGUNAKAN MATLAB Kastina, Mia; Silalahi, Marzuki
JIK: Jurnal Ilmu Komputer Vol 1, No 02 (2016): JIK : JURNAL ILMU KOMPUTER
Publisher : Lembaga Penerbitan Universitas Esa Unggul

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47007/komp.v1i2.1871

Abstract

AbstractThe uncertainty of production system can be caused by stock uncertainty. The uncertainty problems can be solved by fuzzy logic using fuzzy inference system Mamdani method. The algorithm of fuzzy inference system is as follows: analysis of input-output, determining the variables of input-output, fuzzyfication for determining of the fuzzy sets, determining of rules, and  defuzzyfication. The algorithm is implemented in Matlab7. The amount of daily production is determined by centroid method. For Wendnesday, by entering the variable demand of 4,000 packaging and packaging inventory number is 300, then resulted the amount of production of 4,200 packaging. The certainty of  production system can be obtained from uncertainty amounts of demand and stock by using Fuzzy Logic Mamdani Method.Keywords: fuzzy logic, fuzzy inference system (FIS), Matlab7, Mamdani method, system uncertainty. AbstrakPermasalahan yang sering timbul di sistem perdagangan adalah ketidakpastian persediaan yang berakibat pada ketidakpastian sistem produksi. Logika fuzzy merupakan logika pemecahan ketidakpastian sistem melalui sistem keputusan fuzzy. Sistem keputusan fuzzy yang digunakan adalah mengikuti algortima metode Mamdani. Adapun algoritma yang dilakukan adalah pembentukan sistem fuzzy yaitu analisa input maupun output, penentuan variabel input dan output, penentuan fungsi keanggotaan masing-masing himpunan fuzzy-nya, penetapan aturan-aturan berdasarkan pengalaman atau pengetahuan seorang pakar di bidangnya dan implementasi sistem fuzzy. Untuk menentukan jumlah produksi pada setiap harinya, dilakukan pengolahan data dengan menggunakan bantuan software Matlab 7.0 toolbox fuzzy, dimana pada penegasan (defuzzyfikasi) dengan menggunakan metode centroid. Dengan memasukkan variabel permintaan sebesar 4.000 kemasan dan jumlah persediaan sebesar 300 kemasan, maka hasil yang didapatkan untuk jumlah produksi pada rabu sebesar 4.200 kemasan. Dengan logika fuzzy metode Mamdani diperoleh bahwa ketidakpastian jumlah permintaan dan jumlah persediaan bisa diperoleh produksi yang pasti.Kata kunci :  logika fuzzy, fuzzy inference system (FIS), Matlab 7, algoritma,  metode Mamdani
The Synthesis of PbZr0.52Ti0.48O3 and PbZr0.58Ti0.42O3 Ceramic Powder by Use Molten Salt Method and Its Intermediate Product Analysis Syahfandi Ahda; Mardiyanto Mardiyanto; Agus Taufiq; Marzuki Silalahi
Majalah Ilmiah Pengkajian Industri Vol. 13 No. 3 (2019): Majalah Ilmiah Pengkajian Industri
Publisher : BRIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v13i3.3617

Abstract

Lead zirconat titanate, Pb(Zr1-x,Tix)O3 is a material with high piezoelectric properties and many studies have been carried out in development, in order to improve the materials quality in various applications. Therefore,one of them is the development of synthesis with the molten salt method in this study. Choice of the molten salt method is simply and and not expensive. The salt ratio of NaCl / KCl at 1: 1 in moles as a solvent medium was carried out in synthesizing Pb(Zr1-x,Tix)O3. Likewise, the salt ratio with reactant/basic material was 1: 1 in weight percentages. An intermediate product is obtained if the dynamics of chemical reactions in the diffusion process occur indirectly or in stages. To identify intermediate products in this synthesis process, the sintering temperature has been varied to 575, 675 and 775 oC for samples A, B and C, respectively. The results of these syntheses have been identified and characterized using x-ray diffraction (XRD) methods. The Highscore program using the Rietveld method to identify the intermediate product content and each crystal structure has been applied in the rifenement process on the XRD intensity profile with a statistical error of less than 6%. Intermediate products have been obtained as follows, PbTiO3, PbZrO3 and Zr0.4Ti0.6O3. Whereas sample C has obtained two phases namely PbZr0.52Ti0.48O3 and PbZr0.58Ti0.42O3 with tetragonal (P4mm) and rhombohedral crystal structures (R3c).
A New Synthesized Microalloys Steel ODS of High Amplitude Ultrasonically Irradiation Silalahi, Marzuki; Wicaksana, Hanif Abdurrahman; Aziz, Ferhat; Ahda, Syahfandi; Iskandar, Mohamad Riza
Makara Journal of Technology Vol. 23, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Micropowders of oxide-dispersion-strengthened (ODS) steel have been synthesized using the ultrasonic irradiation method with variations in amplitude. The ultrasonic irradiation process is performed for 50 h at a frequency of 20 kHz with 40%, 50%, and 60% amplitudes in toluene solution. The formation of Fe-Cr microalloys in the preparation of Fe- 15Cr-0.5Y2O3 powder was analyzed using SEM-EDS, X-ray diffraction (XRD), and TEM-EDS. The percentage of Fe- Cr phase mass fraction of ODS steel micropowder formed during ultrasonic irradiation with 40%:50%:60% amplitude was 12.2%:34.1%:22.1%, with 25.67:77.02:38.51 nm crystallite size. The crystallite size at 50% amplitude was the largest, and the diffusion process of Fe-Cr-Y2O3 microparticles was most dominant at 50% amplitude. The Fe and Cr phases are still present when the ODS particles successfully dispersed in the main particle.
ULTRASONIC TREATMENT EFFECT ON THE CONSOLIDATION OF Fe-Cr PARTICLE MIXTURES AFTER COMPACTION AND SINTERING PROCESS Marzuki Silalahi; Pudji Untoro; Bambang Suharno; Sri Harjanto
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.765 KB) | DOI: 10.14203/metalurgi.v29i2.289

Abstract

Co-Authors Agus Taufiq Arbi Dimyati Bambang Suharno Deby Deby Ferhat Aziz Herlina Susanti Iskandar, Mohamad Riza Kastina, Mia Mardiyanto Mardiyanto Mardiyanto Mardiyanto Pudji Untoro Pudji Untoro Sri Harjanto Sri Harjanto Syahfandi Ahda Syahfandi Ahda Taufiq, Agus Tumpal P. Wicaksana, Hanif Abdurrahman