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OPTIMIZATION OF CYCLONE GEOMETRY FOR MAXIMUM COLLECTION EFFICIENCY Yunardi, .; Maulana, Ilham; Elwina, .; Wusnah, .; Sylvia, Novi; Bindar, Yazid
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

This paper presents the results obtained from the application of both computational fluid dynamics (CFD) Fluent 6.3 and Design Expert codes to modelling and optimizing a gas-solid cyclone separator based upon its geometrical parameters. A pre-processor software GAMBIT was employed to set up the configuration, discretisation, and boundary conditions of the cyclone.  A commercial CFD code FLUENT 6.3 was employed to simulate the flow field and particle dynamics in the cyclone. The optimization study was performed under either a constant gas inlet flow rate of 0.075 m3/s or a constant inlet gas velocity of 18 m/s. A response surface methodology with three levels (-1, 0, and +1) was employed as the experimental design. Independent variables to be optimized include the ratio of inlet gas width to diameter of the cyclone, W/D, the ratio of conical length to diameter, Lc/D and the ratio outlet diameter to cyclone diameter De/D. The response variables of collection efficiency and pressure drop were correlated in the forms of quadratic polynomial equations. The simultaneous optimization of the response variables has been implemented using a desirability function (DF) approach, computed with the aid of Design Expert software.  The results of investigation showed that at constant flow rate, the following optimum ratios of W/D =0,28, Lc/D =1,5,  and De/D =0,52 were obtained to give a collection efficiency of 90% and a pressure drop of 155 Pa. At the constant inlet gas velocity, the following optimum ratios of W/D =0,25, Lc/D =1,5,  and De/D =0,57 were obtained to give a collection efficiency of 90% and a pressure drop of 190 Pa. This findings indicate that gas inlet treatment at either constant flow rate or constant inlet gas velocity does not produce significant difference on the collection efficiency, but does give significant influence on the pressure drop.
PENGEMBANGAN MEMBRAN MAGNESOL UNTUK PEMURNIAN BIODIESEL Saiful, Saiful; Nurfitriana, Nurfitriana; Ramli, Muliadi; Maulana, Ilham
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 3 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i3.780

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Magnesol membrane has been prepared by mixing chitosan polymer with magnesol particles via phase inversion method. The optimum compositions of adsorptive membranes were 3% chitosan, 15% DMF and 60% loading adsorbent. The porosity of these membranes was 34,17% and swelling degree was 51,91%. The membrane clean water flux was 224,4 Lm?2h?1 at a transmembrane pressure of 2.5 bar.  The adsorptive membrane possesses an open and interconnected porous structure with a large surface area available for biodiesel purities adsorption. The results showed that after contacting in 60 minutes, numbers of acid value was reduced as 81,12% which is in accordance with value of SNI quality standards. In addition, the soap content adsorbed was 86,74%  as potassium soap and 86,73% as sodium soap. The regenerated membrane can be reused with mantaining the high adsorption capacity. The methanol was better than ethanol to regenerate the magnesol membrane. The Magnesol membrane will be a new alternative method for biodiesel purification.Keywords: biodiesel, membrane adsorption, chitosan, magnesol, acid number, soap
PERBANDINGAN PENGGUNAAN MEDIA VIRTUAL LAB SIMULASI PhET (Physics Education Tekhnology) DENGAN METODE EKSPERIMEN TERHADAP MOTIVASI DAN AKTIVITAS BELAJAR PESERTA DIDIK PADA MATERI KELARUTAN DAN HASIL KALI KELARUTAN Marlinda, Marlinda; Halim, Abdul; Maulana, Ilham
Jurnal Pendidikan Sains Indonesia Vol 4, No 1 (2016): APRIL 2016
Publisher : Program Pascasarjana

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Penelitian ini bertujuan untuk membandingkan motivasi dan aktivitas belajar peserta didik pada konsep Kelarutan dan hasil kali kelarutan menggunakan laboratorium Virtual simulasi PhET dengan metode eksperimen. Penelitian dilakukan di SMAN 7 Banda Aceh dengan menggunakan metode quasi eksperimen dengan desain randomized pretest-posttest group. Kelas XI MIA4 menjadi kelas eksperimen I dan kelas XI MIA3 menjadi kelas eksperimen II, masing-masing sebanyak 30 peserta didik. Pengumpulan data dengan menggunakan angket motivasi dan lembar observasi aktivitas belajar peserta didik. Berdasarkan analisis nilai N-gain motivasi kelas eksperimen I sebesar 0,702 dan kelas eksperimen II sebesar 0,510. Hal ini menunjukkan bahwa motivasi kelas eksperimen I lebih tinggi daripada kelas eksperimen II. Peningkatan aktivitas belajar peserta didik pada kelas eksperimen I pada pertemuan awal dengan sebesar 88,61% pada pertemuan kedua menjadi 96,11%, sedangkan kelas eksperimen II pada pertemuan awal sebesar 83,06% meningkat menjadi 89,15% pada pertemuan kedua, sehingga disimpulkan bahwa motivasi dan aktivitas belajar peserta didik pada konsep kelarutan dan hasil kali kelarutan dengan pembelajaran virtual lab simulasi PhET lebih tinggi daripada pembelajaran dengan metode eksperimen.
SYNTHESIS AND CHARACTERIZATION OF TIO2/α-FE2O3 COMPOSITE USING HEMATITE FROM IRON SAND FOR PHOTODEGRADATION REMOVAL OF DYE Lubis, Surya; Maulana, Ilham; ., Masyithah
Jurnal Natural Volume 18, Number 1, February 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v18i1.8649

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In this paper, TiO2/?-Fe2O3 composite with high photocatalytic activity was prepared by a mechanical milling using iron sand from Lampanah in Aceh Besar regency as hematite (?-Fe2O3) source. Hematite was extracted from iron sand by using hydrochloric acid followed by co-precipitating using ammonium hydroxide as co-precipitation agent. Hematite and TiO2 powder were mixed and milled on a planetary ball mill without incorporating any solvent. The materials were characterized by using X-ray difraction (XRD) and scanning electron microscopy energy dispersive x-ray spectroscopy (SEM-EDX). The XRD results showed that the iron (III) oxide synthesized was hematite (?-Fe2O3) phase with the average crystallite size 27.967 nm. SEM analysis showed that iron sand was on irregular form, while the hematite (?-Fe2O3) and TiO2/?-Fe2O3 composite was on regular sphere. The TiO2/?-Fe2O3 composite was evaluated on photodegradation of indigo carmine (IC) dye using UV light irradiation. The highest degradation efficiency of IC (100%) was obtained by initial pH of dye solution equal to 1, photocatalyst dosage of 0.2 g, initial dye consentration of 5 mg/L for 120 min irradiation time. The photocatalytic activity of TiO2/?-Fe2O3 composites using UV light was almost the same as that of by solar light. Keywords: Iron sand, ?-Fe2O3/TiO2 composite, mechanical milling, photocatalyst, indigo carmine
PURIFICATION OF BIODIESEL USING RICE STRAW AND DIOSCOREA ALATA STARCH AS NATURAL ADSORBENTS Yulidar, Yulidar; Saiful, Saiful; Maulana, Ilham
Jurnal Natural Volume 19, Number 1, February 2019
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v19i1.12452

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Janeng starch (Dioscorea Alata) and rice straws are developed to be used as adsorbents in dry washing method to purify crude biodiesel. In this study, we evaluate the potential of rice straw and janeng starch as natural adsorbents in the purification of biodiesel that replace the role of water in absorbing contaminants from biodiesel. The SEM characterization results show that the starch adsorbent and rice straw has an open and porous surface and is evenly distributed for janeng starch. Both adsorbents, either the janeng starch or rice straw, can be applied for the purification of biodiesel. The quality of biodiesel is influenced by the amount of adsorbents used in biodiesel purification. The effectiveness of the adsorbent is shown by the decrease in free fatty acids, alkali numbers, soap numbers and turbidity levels in biodiesel. The concentration of free fatty acid oil in crude biodiesel before the purification step was 0.769 mg-KOH/g, then decreased to 0.128 mg-KOH/g after the adsorption. This acid value had been very low and met the Indonesian quality national standard for biodiesel spesically 0.50 mg-KOH/g. Either janeng starch or rice straw adsorbent was able to reduce the soap content of potassium oleate to level 53.33 ppm from the initial content of 106.67 ppm. These two natural adsorbents can be the alternative adsorbents in the purification of biodiesel that employs dry washing method.
ANTIOXIDANT ACTIVITY OF ETHYL ACETATE EXTRACT OF NUTMEG (MYRISTICA FRAGRANS HOUTT) STEM BARK Maulana, Ilham; Ginting, Binawati; Nurdin, Nurdin; Fakri, Saiful
Jurnal Natural Volume 19 Number 3, October 2019
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v19i3.12618

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Antioxidant activity test for the extract of ethyl acetate nutmeg stem bark (Myristica fragrans Houtt) was carried out using 2,2-diphenyl-1picrylhydrazil (DPPH). The test results of antioxidant activity of ethyl acetate nutmeg stem bark extract with DPPH method at a concentration of 25 ppm, 50 ppm and 100 ppm obtained IC50 value = 68.14 ppm with IC50 value of vitamin C (as positive control) 3.657 ppm. The results of column chromatographic separation of ethyl acetate nutmeg stem bark extract obtained 5 combined fractions namely MFEK 1, MFEK 2, MFEK 3, MFEK 4 and MFEK 5. The test results of the fraction antioxidant activity in a good category were the MFEK 1 fraction. The MFEK 2 fraction to MFEK 5 showed an antioxidant activity lower than compared  to the ethyl acetate extract. This shows that the ethyl acetate nutmeg stem bark extract has a better inhibitory activity, because there are several active compounds contained in the extract which can inhibit free radicals, so the IC50 value of the extract is better than the fractions.
Platinum Metal Complexes of Carbaboranylphophines: Potential Anti Cancer Agents Maulana, Ilham; Loennecke, Peter; Hey-Hawkins, Evamarie
Indonesian Journal of Cancer Chemoprevention Vol 1, No 1 (2010)
Publisher : Indonesian Research Gateway

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Abstract

Polyhedral  heteroboranes in particular dicarba-closo-dodecaboranes(12) and their organic derivatives have been the subject of intense research for over 40 years due to their unique chemical and physical properties. The initial attraction to dicarba-closo-dodecaboranes(12) In the medicinal chemistry research, was a result of their high boron content and stability to catabolism, which are important criteria for cancer therapy, such as BNCT (boron neutron capture therapy) agents. The coordination compounds of the platinum group metals have also received large interest for their potential application as chemotherapeutic agents, since  cis-diamminedichloroplatinum(II), cisplatin, has been reported to have  capability as tumor inhibitor. Hence, applications can be envisioned for related  cis platinum complexes. Complex of  cis-rac-[PtCl2{1,2-(PRCl)2C2B10H10}] (R=Ph,  tBu, NEt2, NPh2) have been synthesized by employing known carbaborane based phosphine ligands of clorophoshino-closo-dodecaborane , with complex of  cis-[PtCl2(COD)] (COD = 1,5-cyclooctadiene) in an N2-atmosphere. The obtained complexes possess expected structure configuration, namely  cis-rac.  The characterization of the complex has been carried out using 1H,  31P,  13C and  11B-NMR (Nuclear Magnetic Resonance), X-ray of single crystals, elemental analysis, IR (infra red) and mass spectroscopy (MS). The  31P{1H} NMR spectra of all the platinum complexes distinctly show the typical platinum satellites which are attributed to 31P-195Pt-coupling, in which the 31P{1H} NMR spectrum exhibits three lines with an intensity ratio of ca. 1:4:1. The structure of the platinum complexes consists of a slightly distorted square-planar coordination sphere, in which the platinum  atom is bonded to two chlorides and two phosphorus atoms of the chelating carbaboranylphosphine. Thus the platinum atoms exhibit the coordination number four, which is preferred in platinum(II) complexes.
ISOLATION AND ACTIVITY ANTIOXIDANT TEST OF COCOA POD HUSK ETHYL ASETAT EXTRACTS (THEOBROMA CACAO L) Ginting, Binawati; Maulana, Ilham; Saidi, Nurdin; Astryna, Syarifah Yanti
Jurnal Natural Volume 19 Number 2, June 2019
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v19i2.12568

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Isolation and testing of antioxidant activity with1,1-difenil-2-pikril hidrazil (DPPH) from ethyl acetate extract ofcocoa pod husk(Theobroma cacao L) has been carried out.Theobroma cacaoextract (TCE) showed highly strong antioxidant activity with IC50 = 8,75 ppm and vitamine C = 6,07 ppm as positive control. Isolation of the active components of TCE by column chromatography using silica gel absorbent 60 mesh ASTM (Merck 774) and the eluent n-hexane: ethyl acetate (9:1), obtained 7 fraction combined (TCE 1 to TCE 7). There are 6 combined fractions having the potential as antioxidants, namely TCE 2 to TCE 7 with a range of IC50 (6,46 ppm ? 91,8 ppm). TCE 2 fraction has a very strong antioxidant activity with IC50 = 6,46 ppm. Separation of TCE 2 fraction on silica column chromatography obtained 4 combined fractions (TCE 2.1 to TCE 2.4). The test results of antioxidant activity showed that TCE 2.4 had very strong activity with IC50 = 42,7 ppm.For the TCE 2.2 fraction, preparative TLC was carried out using eluent n-hexane: ethyl acetate (9.5: 0,5) obtained by TCE 2.2.4 isolate with a melting point of 114-120 °C and was a steroid class.
ANALYSIS OF TURBULENCE MODELS PERFORMANCE FOR THE PREDICTIONS OF FLOW YIELD, EFFICIENCY, AND PRESSURE DROP OF A GAS-SOLID CYCLONE SEPARATOR Sylvia, Novi; Yunardi, .; Maulana, Ilham; Elwina, .; Wusnah, .; Bindar, Yazid
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

This paper presents the results obtained from the application of computational fluid dynamics (CFD) to modelling the flow field of a Lapple cyclone and to optimizing the cyclone based upon its geometrical parameters. A pre-processor software GAMBIT was employed to set up the configuration, discretisation, and boundary conditions of the cyclone.  The characteristics of the cyclone being studied was 0.2 m in diameter, receiving a gas flow rate of 0.1 m3/s with a particle mass loading of 0.01 kg/m3.  A commercial CFD code FLUENT 6.2.16 was employed to simulate the flow field and particle dynamics in the cyclone. The objective of this research was to investigate the performance of a number of turbulence models on the prediction of the flow field, collection efficiency and pressure drop in the Lapple cyclone. A number of five turbulence models under Reynolds Averaged Navier Stokes (RANS) category, including Spallart-Allmaras, standard k-? model, RNG k-? model, standard k-? model, and Reynolds Stress Model (RSM) were examined in the simulation of the flow field and particle dynamics inside the cyclone. A validation of all calculation was performed by comparing the predicted results in terms of axial and tangential velocities, efficiency and pressure drop against experimental data of a Lapple cyclone taken from literature. The results of the investigation show that out of five turbulence models being tested, the RSM presented the best predicted results. The predictions of axial and tangential velocities as well as cyclone efficiency by this model are in excellent agreement with the experimental data.  Although the pressure drop in the cyclone is under-predicted, the RSM predictions are far better than those of other model. Other turbulence models are over-predicted and under-predicted the axial and tangential velocity, respectively.  With respect to efficiency and pressure drop of the cyclone, other models are capable of following the trend of the experimental data but they failed to agree with the experimental values.  These results suggest that the RSM is the most suitable turbulence model to represent the flow field and particle dynamics inside a cyclone gas-solid separator.
SISTEM PENGONTROLAN MESIN CETAK PAVING BLOK MENGGUNAKAN VISUAL BASIC.NET BERBASIS MIKROKONTROLLER ARDUINO DEDY ISKANDAR Iskandar, Dedy; Illahi, Achmad Wahyu; Maulana, Ilham
SENSI Journal Vol 2 No 1 (2016): SENSI JOURNAL
Publisher : UNIVERSITAS RAHARJA

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Seiring dengan perkembangan ilmu pengetahuan yang semakin pesat dalam bidang teknologi pada khususnya. Hal ini ditandai dengan terciptanya alat?alat canggih dengan bantuan mikrokontroler untuk kemudahan, efisiensi waktu dan keamanan. Pengendalian industri menengah kebawah ini umumnya tidak terus menerus menggunakan tenaga manusia untuk menyalakan mesin dan memproduksi suatu barang. Sehingga dibutuhkan suatu pemecahan masalah tersebut, maka dirancang sistem pengontrolan mesin cetak paving block dengan menggunakan sensor, mikrokontroler arduino dan interface pada visual basic .NET. Sistem pengontrolan ini dirancang dengan menggunakan pemrograman bahasa C dan software arduino serta kebutuhan interface menggunakan software visual basic.NET. Metode yang dilakukan yaitu perancangan, serta pengujian alat. Saat mesin dinyalakan maka mikrokontroler dan sensor yang sudah dirancang akan aktif, pada saat ojek yang melewati sensor tersebut, maka mesin tersebut akan bergerak untuk menghasilkan produk yang akan dibuatnya dengan bantuan sensor gerak. Hasil akhir dari sistem ini adalah untuk mempermudah pekerja dalam mengendalikan mesin serta dapat memaksimalkan pendapatan barang.