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All Journal Jurnal Kebidanan Jurnal Penelitian dan Evaluasi Pendidikan Reaktor Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains AVERROUS: Jurnal Kedokteran dan Kesehatan Malikussaleh Unri Conference Series: Community Engagement Jurnal Kesehatan Amanah Al-'Adad: Jurnal Tadris Matematika Karakter: Jurnal Riset Ilmu Pendidikan Islam
Komalasari Komalasari
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Bahan Bakar Padat Dari Tandan Kosong Sawit Menggunakan Proses Torefaksi; Variasi Suhu Dan Ukuran Bahan Baku Eferius Mendrofa; Komalasari Komalasari; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Palm Empty Fruit Bunches (EFB) can be used as alternative energy source by using torrefaction process. Torrefaction is a pre-treatment process of biomass into solid fuel within temperature range of 200-300 oC in an inert condition. The aim of this research was producing solid fuel from oil palm EFB and studyng the effect of process variabel towards characteristic of solid fuel that was resulted. Torrefaction of EFB was using fixed bed horizontal reactor with temperature (225-275 oC) and particle size (5-15 mm). The quality of product that analyzed was calorific value, mass yield, energy yield and proximate (moisture content, ash content, volatile content and fixed carbon). The result of research was obtained for calorific value was 18362.17-20113.19 kJ/kg, mass yield was 52.15-77.85% and energy yield was 65.82-90.00%. The result proximate analysis such as moisture content was 1.22-1.35%, ash content was 6.97-13.59%, volatile content was 35.71-56.64%, and fixed carbon was 33.45-52.13%. From the result that was obtained, the effect of rising temperature given increasing to the calorific value, energy yield, ash content, and fixed carbon.Keywords: palm empty fruit bunches, biomassa, solid fuel, torrefaction.
Pengaruh Ekstrak Daun Nanas (Ananas comousus) Sebagai Green Inhibitor Terhadap Laju Korosi Baja Karbon Dalam Media Asam Klorida Fauzia Mulyana; Komalasari Komalasari; Syelvia Putri Utami
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Corrosion is the deterioration of metals by chemical attack or interaction with its environment. The corrosion process is a natural phenomenon that cannot be stopped but can be prevented in many ways. The use of inhibitor is the best way to prevent metal from corrosion. Pineapple leaves are a green inhibitor that can be used to reduce the corrosion rate. This research aims to determine the concentration of tannin in pineapple leaves extract, the effect of variations in the concentration of corrosive media, the concentration of the inhibitor, the duration immersion against corrosion rate and inhibition efficiency of pineapple leaves extract. The soxhletation method was used to pineapple leaves extract with a ratio of solvent volume ethanol:aquadest 1:4. The test method carried out in this research is the weight loss method by using a variation of the concentration of the pineapple leaves extract (0, 0.5, 1.0 and 1.5 g/L) and the duration immersion (8, 16, 24, and 32 hours) in the concentrated hydrochloric acid solution 0.5M. The lowest corrosion rate in HCl solution 0.5M using inhibitor 1.5 g/L with duration of immersion 32 hours resulted 60.639 mpy and highest corrosion rate in HCl solution 1.0M without the addition of inhibitors with duration of immersion 24 hours resulted 530,659 mpy. It can be concluded that specimen with added higher the concentration of inhibitor in the lower concentration corrosive media yielded the corrosion rate to become lower in long immersion time.   Keywords: corrosion rate, inhibitor, pineapple leaves
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Terumbu Karang Melalui Proses Presipitasi Dengan Variasi Rasio Ca/P Dan pH Reaksi Getra Anugrah; Yelmida Azis; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Hydroxyapatite is a crystalline molecule composed of phosphorus and calcium with the molecular formula Ca10(PO4)6(OH)2. Synthetic hydroxyapatite is known as one of the important implant materials because it has bioactive, biocompatible and osteoconductive properties that chemically resemble bone and tooth mineral components, so it can be used as a substitute for human hard tissue. In this study hydroxyapatite was synthesized from PCC coral reefs using precipitation method with variations in pH (9; 10 and 11) and the mole ratio of Ca/P (1.57; 1.67 and 1.77). The obtained hydroxyapatite was analyzed by using XRD and SEM-EDX analysis. The obtained hydroxyapatite obtained was analyzed by XRD analysis with the best crystallinity closest to the standard hydroxyapatite and the smallest crystal sized was 10.76507 nm at pH 9 with Ca/P ratio of 1.67. Based on the SEM-EDX analysis, the best results was produce at pH 9 and the mole ratio of Ca/P 1.67 with agglomerate shaped particles, 2.549% particle distribution and final Ca/P mole ratio 1.61.Key word: Ca/P ratio, hydroxyapatite, pH, precipitation
Prarancangan Pabrik Etilen Dari Cracking Nafta Dengan Proses Maxene Fikri Miftahul Shiddiq; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Ethylene produced by cracked the chain of various componen in naphtha. n-paraffin is preferable for thermal cracking reactor feed to produce ethylene. MaxEne process help to result n-paraffin rich stream as feed to thermal cracking reactor. The main equipment of MaxEne process is adsorbent chamber with n-butane as desorbent agent and two debutanizer, one of them is debutanizer extract column and the other one is debutanizer raffinate column. The purpose of this study is to determine the chemical design and mechanical design of debutanizer raffinate column also the economical analysis of plant. The chemical design of debutanizer raffinate column such us determination of the number of tray is using fenske methode. The main mechanical design of  debutanizer raffinate column is to determine the design of support and flange. The economical analysis of the plant is determination of Cumulative Cash Ratio (CCR) and Present Value Ratio (PVR). The number of tray is 34. The heigt and diameter are 38,42 and 5,9 m respectively. The type of skirt is conical skirt with angle 83° to the base ring. The Thickness of the flange joint the head with shell is 0,85 m. The value of Cumulative Cash Ratio (CCR) and Present Value Ratio (PVR) are 2.2 and 1.29 respectively. Keywords : maxene, ethylene, thermal cracking, desorbent, n-paraffin
Pembuatan Bodi Hidroksiapatit Berpori Menggunakan Template Pelepah Pisang Dengan Metode Replica Ilham Habib; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Banana midrib (Musa Paradisiaca) can be used as an ideal pore-forming template for fabricating hydroxyapatite (HA) implant because it has an architecture which formed a hierarchical multimodal pore system. The purpose of this research is for fabrication of HA-based bone implant with the utilization of banana midrib as a porous-making template. Banana midrib was cut into circular samples of 1 cm diameter and length 1 cm. Banana midrib was then impregnated with a slurry made by mixing (8,32, 10, 11,68) grams of HA, sago 11% of HA, 3% Darvan 821A and 10 grams of aquadest. The mixture wa stirred for 24 hours to form a slurry. The substrates were impregnated and then dried at 120oC for 2 hours. The obtained green bodies then burned at 600oC for 1 hour and followed by sintering at 13000oC for 1 hour. The result showed that the porosity of the implant in the range of 54,27-57,64% and compressive strength 2,99-5.58 MPa, respectively. The formed pores have a diameter of 30-50 μm. The fabricated implant can be applied mechanically to cancellous bone.Keywords: banana midrip, bone implant, hydroxyapatite, scaffold
Kinetika Adsorpsi Ion Logam Cu+2 Menggunakan Tricalcium Phosphate Sebagai Adsorben Siti Chotijah; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Abstract

The methods used for reducing the level of heavy metals have been developed. One of the methods used for reducing the level of Cu metal wastes in waters is the adsorption process. The purpose of this research is to observe the effects of the initial Cu+2 metal ion concentration and the mass of the adsorbent on the capability of tricalcium phosphate (TCP) to adsorb, and also to establish a suitable model of the adsorption kinetics. Add a 500 mL solution of Cu (3 mg/L, 9 mg/L, and 15 mg/L) to tricalcium phosphate (TCP) (1 gram, 2 gram, and 3 gram) in a beaker glass, stirred with a speed of 300 rpm at 30oC. Take the solution of Cu2+ at 0; 30; 1; 1.5; 2; 2.5; 3; and 3.5 minutes, and then analyze the solution of dicentrifuge Cu and Cu by using the Atomic Absorption Spectroscopy (AAS). The research shows that the smaller the concentration of the adsorbent and the bigger the mass of the adsorbent, the bigger the capability of the Cu+2 metal ion to adsorb. The research also obtains the value of the kinetics, with a concentration of 3 mg/L, of 1 gram adsorbent (4.3721 g/mg.min), 2 gram adsorbent (5.4432 g/mg.min), and 3 gram adsorbent (5.4925 g/mg.min). With a concentration of 9 mg/L, 1 gram adsorbent (0.9926 g/mg.min), 2 gram adsorbent (1.1154 g/mg.min), and 3 gram adsorbent (1.4401 g/mg.min). With a concentration of 15 mg/L, 1 gram adsorbent (0.1390 g/mg.min), 2 gram adsorbent (0.2490 g/mg.min), and 3 gram adsorbent (0.4805 g/mg.min). The minimum value of the adsorption kinetics is obtained at 1 gram adsorbent with a concentration of 15 mg/L (0,1390 g/mg.min) and the maximum value of adsorption kinetics constants is obtained at 3 gram adsorbent with a concentration of 3 mg/L (5.4925 g/mg.min).Keyword : kinetic, adsorption, cuprum, tricalciumphosphate (TCP) .
Adsorpsi Logam Cd, Cu Dan Pb Dengan Menggunakan Hidroksiapatit (HA) Sebagai Adsorben Kendro Prasetyo; Yelmida Azis; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

This study investigated the ability of hydroxyapatite (HA) to adsorb aqueous Cd2+, Pb2+ and Cu2+ metal ions from single-metal and multi-metal ions reaction systems. Hydroxyapatite as adsorbent made from wasted-eggshell through precipitate calcium carbonate (PCC) processes. Based on AAS as intrumentation, show that in single metal ions adsorption, the sorption affinity of HA for Pb(II) is always higher than that for Cu(II) and for Cd(II); the sorption maxima for the Cd2+, Pb2+ and Cu2+ metal ions follow the order Pb2+ > Cu2+ > Cd2+. The greatest sorption percentage of Pb(II) is 99,338% ; Cu(II) is 95,403% and Cd(II) is 86,343%. The sorption affinity of HA for metal ions follow the order Pb2+ > Cu2+ > Cd2+ , this could be inversely proportional to the hydrated ionic radii as Pb2+ (4.01 Å) < Cu2+ (4.19 Å) < Cd2+ (4.26 Å).Keywords: hydroxyapatite (HA), Cd, Pb, Cu, competitive adsorption, adsorption selectivity, hydrated ionic radii
Pemanfaatan Ekstrak Kulit Pisang Sebagai Green Inhibitor Dengan Metode Maserasi Dalam Upaya Mengendalikan Korosi Pada Baja ASTM 36 Harfiah Faradila; Komalasari Komalasari; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Corrosion is the interaction of materials with the environment that result in damage to material and the environment. a method of restricting the occurrence of corrosion processes with inhibitors. An organic inhibitor that is an inhibitor that is made from natural materials available in nature. Extract of banana peels contains tannin compounds that can prevent corrosion. The purpose of the research was to determine yield and extract of banana peels maceration method, determine the rate of steel corrosion using inhibitor corrosion, and determine the influence of the concentration of inhibitor, corrosion, media and contact time variation of the rate of corrosion. This research began with extract of banana peels is done by the method of contact during the maceration time with the 7hari. Then proceed with the contact of steel corrosion on media that is HCl and NaOH concentration extract with 0 gr/L and 1 g/L on the contact time of 12, 24, 48, 72 hours. The results of this study showed the greater the concentration of the inhibitor of the smaller banana peels extracts the rate of corrosion.Keywords: banana peels, carbon steel ASTM 36, corrosion rate, green inhibitor.
Penggunaan Inhibitor Dari Ekstrak Daun Ketapang (Terminalia Catappa L) Dengan Metode Sokletasi Untuk Mengendalikan Laju Korosi Pada Baja Karbon ASTM A36 Mastiar Krisdayanti Sinaga; Komalasari Komalasari; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
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Abstract

Corrosion has been identified as one of the major problems in the chemical industry, especially in the pipeline’s system. The inhibitor is the most effective way to protect the metal against corrosion. The natural corrosion inhibitor is chosen as an alternative because it’s safe, widely available, low cost, biodegradable and environmentally friendly. This study aims to know the corrosion rate and the inhibition efficiency of Terminalia Catappa L leaf extract for low carbon steel. Terminalia Catappa L leaf extract was obtained by soxhlet extraction using ethanol-water as the solvent. Corrosion rate were determined by using the weight loss method. Low carbon steel was immersed in HCl 0.1 0.5 m and 1 M with and without Terminalia Catappa L leaf extract 0 g/L and 1.5 g/L by immersion time 24, 48,72,96 h. The result showed that corrosion rate decreases on increasing of concentration of the extract and increases the inhibition efficiency. The maximum efficiency was obtaining at 1.5 g/L of corrosion inhibitor of 96 hours contact time in HCl 0.1 M with inhibition efficiency 89,77%. Keywords: corrosion, HCl, inhibitor, low carbon steel, Terminalia Catappa L leaf
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Terumbu Karang Melalui Proses Hidrotermal Dengan Variasi Rasio Ca/P Dan pH Reaksi Muhammad Khairil Amri; Yelmida Azis; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is one of the calcium phosphate compounds which is the main inorganic component of composing human hard tissue such as bones and teeth. Hydroxyapatite (HAp) is a material used as bone implant, adsorbent and catalyst. The purpose of this study was to determine the effect of variations in the Ca/P ratio (1.57; 1.67 and 1.77) and reaction pH (9, 10 and 11) to degree of hydroxyapatite crystallinity, and compare the results of XRD hydroxyapatite characterization on the variations carried out. The research begins with the calcination process of coral reefs to form CaO which is made into PCC using the carbonation method. Coral PCC and (NH4)2HPO4 were reacted using hydrothermal vessels with variations in the Ca/P ratio (1.57; 1.67 and 1.77) and mixing pH of reactants at (9, 10 and 11), reaction time for16 hours at 140oC. The synthesis results will be analyzed using X-Ray Diffractometer (XRD) and Scanning Electron Microscopy (SEM-EDX) and Brunaeur-Emmet-Teller (BET). The hydroxyapatite results were obtained on the condition of 1.67 Ca / P ratio and pH 11 with a crystal diameter of 26.91 nm, crystallinity degree of 74.55%, final Ca / P ratio of 1.66 and wide surface which is 27,003 m² / g.Keywords: hydroxyapatite, hydrothermal, carbonasi, precipitate calcium carbonate
Co-Authors A. Fadli Abdul Hafiz Hidayat Abdul Rahman Marwis Karim Abdullah Agung Hayyuka Adela Shofia Addabsi Adha Widoni Agung Prabowo Ahmad Fadli Al Qarni Putra Amun Amri Astri Gusrita Asyraful Akbar Ayu Annisya Tri Adriana Boy Jansen Roberto Manik d R. Sari Dani Pradana Desi Heltina Dhamala Shobita Chandra Dimas Nofriyan Drastinawati Drastinawati Edy Saputra Eferius Mendrofa Evelyn Evelyn Fachry Abda El Rahman Fadhila Ulfa Farhan Hidayatullah Farida Farida Fauzia Mulyana Fikri Miftahul Shiddiq Firman Tampubolon fitriyanti fitriyanti Getra Anugrah Hadrian Yonas Sebastian Napitupulu Harfiah Faradila Ian Desi Rosalina Situmeang Ida Zahrina Ilham Habib Ines Indriyani Jimmy Anderson Kartono Kartono Kendro Prasetyo M. S. Amir Mardianti Mardianti Mastiar Krisdayanti Sinaga Muhammad Alfin Khairullah Muhammad Khairil Amri Muhammad Rivaldiansyah Mustika Canra Oding Sitorus Paian Harianja Primadevi, Inggit Putri Rahmadani Qurotullaili Qurotullaili Rahmat Ilham Rajuddin Rajuddin rima siburian Rina Maryenti Riona Sanjaya Roin Nuretha Rozanna Sri Irianty Roziana Roziana Saefudin Zuhri Siska Siska Siti Chotijah Sri Rezeki Muria Sry Utami Pardede Syelvia Putri Utami Teuku Azhari Hassan Tubagus Maruf Ansori Vina Sutratul Putri Viona Aulia Rahmi Wahyu Hidayat Yelmida Azis Zuchra Helwani Zultiniar Zultiniar