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All Journal Jurnal Sains dan Teknologi Jurnal Sains Materi Indonesia Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Untirta Civic Education Journal Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri Jurnal Pengabdian Magister Pendidikan IPA Jurnal Abdi Ilmu Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya GANDRUNG: Jurnal Pengabdian Kepada Masyarakat Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences International Journal Of Science, Technology & Management (IJSTM) Journal of Bioprocess Chemical and Environmental Engineering Science Abdimas Awang Long: Jurnal Pengabdian dan Pemberdayaan Masyarakat Journal of Social Empowerment Gemilang: Jurnal Manajemen dan Akuntansi Optimal: Jurnal Ekonomi dan Manajemen Smart Techno (Smart Technology, Informatic and Technopreneurship) Biner : Jurnal Ilmu Komputer, Teknik dan Multimedia AMMA : Jurnal Pengabdian Masyarakat International Journal of Economic Research and Financial Accounting Anggaran: Jurnal Publikasi Ekonomi dan Akuntansi Journal of Business Integration Competitive Jurnal Mahkota Bisnis Proceeding of The International Conference on Social Sciences and Humanities Innovation Proceeding of The International Conference on Management, Entrepreneurship, and Business
Ahmad Fadli
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Pemanfaatan Limbah Fly Ash Batubara Untuk Pembuatan Paving Block Geopolimer Dengan Variasi Temperatur Curing Dan Rasio Larutan Aktivator Terhadap Fly Ash Wasty Rusjaya; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Paving blocks used as a construction material for roads, parking area, and city parks. The objectives of this research are to make paving blocks of coal fly ash as a raw material in the manufacturing paving blocks, investigate the effect of curing temperature and the ratio of liquid activator/fly ash on the characteristics of the paving block (compressive strength, porosity, density, crystallinity, and morphology) and testing Toxicity Characteristic Leaching Procedure (TCLP) paving block geopolymer. 247,5 gr of coal fly ash were mixed with 742,5 gr of aggregate (sand) and added 82,88 gr of liquid activator as well as 1,26 gr of superplasticizer inside the container. Then, the mixture was strirred and pour into cube mould with size 5x5x5 cm3, subsequently put at room temperature for 24 hours and dried at a curing temperature of 60 °C, 80 °C, 100 °C. The characteristics of were compressive strength, porosity, density, TCLP, crystallinity, and morphology determined. The result show that increasing curing temperature lead to increasing compressive strength and density while the porosity decreased. The compressive strength, porosity, and density of paving blocks were 19,73-49,33 MPa; 4,0-7,6%; 2,0-2,3 g/cm3; respectively and metal contents Zn, Pb, Cu, Cd were 3,591 mg/L; 1,577 mg/L; 1,079 mg/L; and 0,223 mg/L; respectively. The highes of compressive strength 49,33 MPa was obtained at paving blocks paper at the curing temperature of 100 °C and the ratio of liquid activator/fly ash of 0,7.Keywords: curing temperature; fly ash; geopolymer; paving block; liquid activator
Sintesis Nanokitosan Menggunakan Metode Gelasi Ionik Dengan Variasi Konsentrasi Asam Formiat Allailus Syah Safara; Ahmad Fadli; Sunarno Sunarno
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Particles at the nanometer scale have unique physical properties compared to particles at larger sizes, especially in improving the delivery quality of drug compounds. The study aims to synthesis nanochitosan using the ionic gelation method and determined the effect of variation in the concentration of formic acid on the characteristics of nanochitosan. The procedure for making nanochitosan is chitosan dissolved in formic acid (0.2% and 2%) by stirring using a magnetic stirrer. After that, the STPP solution (0.1%) at the chitosan:STPP 5:1 volume ratio was added to the chitosan solution. Stirring was carried out for 1 hour with a stirring speed of 1200 rpm. Furthermore, the nanochitosan was characterized by using Particle Size Analyzer (PSA). Results of the research found that the polydispersity index of chitosan-STPP particles was decreased when the concentration of formic acid was increased, at the concentration of STPP (0.1%) and concentrations of formic acid (0.2% and 2%) are 0.438 and 0.178 respectively. Keywords: formic acid, ionic gelation, nanochitosan, sodium tripolyphosphate
Evaluasi Pressure Drop Pada Sumur Injeksi Uap Di Lapangan Duri Dengan Persamaan Beggs-Brill Dan Moody Ahmad Riadi S Hasibuan; Bahruddin Bahruddin; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Steam injection is a heat transfer process to petroleum reservoir through multiphase flow of wet steam. Estimating pressure drop in multiphase flow is more difficult than for single-phase flow. Multiphase flow is a complex phenomenon because of the interdependence of various variables that affecting pressure drop such as flow regime, hold up, flow geometry at horizontal, vertical or deviated, flow rate of each phase and the fluid properties of each phase. The purpose of this study is to find out the most appropriate model to calculate the pressure drop in steam injection wells and understand parameters that most affecting pressure drop. Research methodology for this study is descriptive analysis. Field data from 30 injection wells in Duri field are collected and compared with 2 variations of Beggs-Brill and Moody equation, which are the original model and the model with Palmer correction. Both models are translated into a simple computing program using Excel application. Calculation result from the model is compared with the measurement results to understand the deviation or error. As the result of this study, it is shown that Beggs-Brill and Moody model without Palmer correction is suitable for steam injection application. Average error is only 0,2% with a standard deviation of 3,32%. Further information is obtained from the sensitivity analysis that the accuracy of pressure drop calculation is affected by measurement accuracy of the steam flow rate, steam quality and steam temperature. Keyword: Beggs and Brill correlation, Moody diagram, Palmer correction, pressure drop, steam injection.
Pemanfaatan Limbah Fly Ash Batubara Untuk Pembuatan Paving Block Geopolimer Dengan Variasi Konsentrasi NaOH Dan Rasio Natrium Silika Terhadap Natrium Hidroksida (Na2SiO3/NaOH) Wyda N Saragi; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Paving block geopolymer is a material synthesized through a polymerization process which can be used in the construction, especially of homes, buildings and roads. The objective of this research are to determine the effect of the concentration of NaOH and sodium silica to sodium hydroxide ratio (Na2SiO3 / NaOH) and characterization of geopolymer paving blocks made from coal ash. Paving block geopolymer prepared by mixing coal ash and fine aggregate and then added liquid activator (sodium hydroxide and sodium silica). Paving block pour into cube mould with size 5x5x5 cm3. Subsequently the mixture put at room temperature for 24 hours and then dried at curing temperature of 90 ° C for 24 hours. Characteristic of geopolymer paving blocks ie compressive strength, density, porosity, morphology and TCLP test were determined. The compressive strength of paving block geopolymer increase with concentration NaOH and sodium silica to sodium hydroxide ratio. The obtained of compressive strength of paving block geopolymer of 13,730 MPa at concentration NaOH 10M and increase to 19,068 Mpa at concentration NaOH 14 M. The highest density of paving block geopolymer is 2,17 gr/cm3 at concentration NaOH 14 M.Key words : fly ash, geopolymer paving block, sodium hydroxide, sodium silicate
Pengaruh Suhu Sintering Pada Pembuatan Prototipe Replika Tulang Berbasis Hidroksiapatit Dengan Metode Starch Consolidation Adi Mulyadi Putra; Aman Aman; Ahmad Fadli
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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3D bone replica based on porous Hydroxyapatite (HA) is a candidate bone implant material that has similarities to the original bone. Starch consolidation is one of the methods for making HA scaffold The purpose of this research are to determine the effect of sintering temperature on porous HA characteristics. This research was conducted by mixing 20 grams of HA with 8 grams of sago starch and 25 ml of distilled water to form slurry. The slurry formed was then stirred at 400 rpm. The mixture was then put into a mold. Then the mixture in the mold was heated to 100oC for 60 minutes. After that, the green bodies are removed from the mould and dried in an oven at 80°C for 24 hours and 110°C for 8 hours. The dried sample is then put into the furnace. Combustion is carried out at a temperature of 600˚C and ended with sintering at a temperature of 1250˚C with the increasing rate of sintering temperature at 2°C/minute and holding time for 1 hour. The higher the sintering temperature causing the density, shrinkage and bending stress to be greather. Sintered bodies show density in the range of 2.52-2,56 gr/cm3, shrinkage 35.87–39.47% and bending stress 4,026.49 MPa. Keywords: bending stress; bone replica; hydroxypatite; sintering
Kinetika Reaksi Demineralisasi Isolasi Kitin Dari Cangkang Ebi Subkhan Maulana; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Chitin is a naturally abundant polymer and most of it was used as a surfactan and cosmetic raw material. Chitin be able to derive from natural source like shrimp shell waste. The aims of this research were to study the effect of various of time reaction and HCl concentration towards both of calcium concentration reduction and demineralization kinetic model with approach to shrinking core model (SCM). There are 3 stage of model which be able to use: Film layer diffusion, Diffusion through the outcome layer and Chemical reaction. It was began with deproteination at first with NaOH 3,5 % and continued with demineralization using HCl at concentration 0,3 N; 0,6 N; 0,9 N and 1,2 N with variation of reaction time at 15, 30 and 15 minute. The specimen had dried in the oven before the calcium analyzed. The results showed calcium concentration decrease along with increasing of HCl concentration. It get kinetic model at concentration 0,3 N of HCl usage with form: 1−(
Kinetika Adsorpsi Pada Penjerapan Ion Timbal Pb2+ Terlarut Dalam Air Menggunakan Partikel Hydroxyapatite Fernando Susilo; Ahmad Fadli; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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This research are to observe the effect of mass adsorbent (hydroxyapatite) and temperature in adsorption of metal ions Pb2+ using adsorbent hydroxyapatite (HAp) and determine a suitable adsorption kinetics model. Pb2+ solution 9,982 mg/L of 500 mL where mixed with variation of mass HAp (0.3 g, 0.5 g and 0.9 g)  in a glass beaker while stirred with rate 100 rpm at variation temperature (27, 40, and 50 oC).Pb2+ solution was taken at a certain time, then the solution  filtered and analyzed by atomic absorption spectrophotometer (AAS). The result showed that the adsorption of metal ions is pseudo second order reaction with the higher mass of adsorbent and with lower temperature. In this research maximum constant value of adsorption kinetic was 0.2758 g/mg.min obtained with mass of adsorbent 0.9 g and temperature of 27 oC. While minimum value of adsorption kinetics constant 0.0389 g/mg.min obtained with mass of adsorbent  0.3 g and temperature of 50 oC.  Keywords:  Adsorption, Hydroxyapatite, Kinetic, Timbale.
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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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
Aplikasi Shringking Core Model (SCM) Pada Reaksi Deasetilasi Kitin Menjadi Kitosan Mochamad Reizal Ath Thariq; Ahmad Fadli; Amun Amri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Chitosan is derived from chitin compound used in the biomedical field. Chitosan can be synthesized from ebi waste.Chitosan can be produced by chemichal methods through the deproteinasi process, the demineralization process and the deacetylation process.in this research, Ebi powder was reacting with NaOH 3.5% (deproteinasi), ratio 1:10 (w/v) for 2 hours stirring by 150 rpm. The product reacted with HCl 1 N (demineralization), ratio 1:15 (w/v) for 1 hour stirring by 150 rpm. Then product was reacting using NaOH 50% (deacetylation), ratio 1:20 (w/v) at a temperature of 100oC, 110oC and 120oC with stirring by 150 rpm for 2 hours. Samples were taken every 10 minutes rise as much as 10 mL, washed until pH neutral and dried. Deacetylation degree of chitosan analyzed using acid-base titration method. The highest degree of deacetylation of the chitosan will be 71.68% to 80.28% at a temperature of 100-120oC. The best reaction kinetics model to describe the occur in the synthesis of chitosan is a model of ash layer (chitosan) to control.Keywords: deacetylation, reaction kinetics, chitosan, waste ebi, shrinking, core model.
Coating Hidroksiapatit Pada Logam Stainless Steel 316L Menggunakan Metode DIP Coating Dengan Variabel Temperatur Sintering Dan Komposisi Air Dalam Suspensi Putri Arini; Ahmad Fadli; Amun Amri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
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Stainless Steel 316L is metal that can be used as a bone plate, but it has low biocompatibility. To achieve better biocompatibility with bone, Stainless Steel 316L can be coated with hydroxyapatite. Hydroxyapatite (HA) is the main inorganic phase of human bone with a composition around 65% of our bone. Dip coating techniques was used to applyhydroxyapatite into Stainless Steel 316L. Stainless Steel 316L with a size of 2x1x0,1 cm was dipped into a suspension containing HA, sago starch and water mixed with a rate of 250 rpm for 20 hours. Suspension were prepared with compositions 16 gram, 18 gram and 20 gram aquadest. And then coating HA were dried in oven at temperature 110 °C for 30 minutes.Coating HA were sintered at temperatures of 600°C, 700°C and 800 °C for 1 hour. SEM observation showed that the thickness of HA coating composition of 20 gram, 18 gram and16 gram increased in the range of 42 – 144 μm. Maximum shear strength obtained in this research was 11,78 MPa.Keywords : Coating, Dip Coating, Hydroxyapatite, Stainless Steel 316L
Co-Authors Abdul Kohar Abdul Malik K.A Abdul Rasyid Achmad Noerkhaerin Putra Adam Samsudin Noor Ade Pratama Adela Shofia Addabsi Adha Widoni Adi Maulana Putra Adi Mulyadi Putra Adrianto Ahmad Aep Saefullah Afrila Afrila Agung Prabowo Agung Prabowo Agus Susanto Agya Mutia Alifta Ahmad Aguswin Ahmad Fadhil Nugroho Ahmad Riadi S Hasibuan Ahmad Zaki Akhmad Akhmad Akhmad Akromusyuhada Alfarisi, Cory Dian Allailus Syah Safara Aman aman Amun Amri Andi Risfan Rizaldi Annisa Aprilya Putri Annisa Rahmat Ap’aluddin Ari Aditia Sukma Sukma Arifin Setiabudi Arisky Rahmatulloh Arosyidin Arosyidin Aulia Permatasari Bahruddin Benny Ahmadi Bima Wandika Putra Cahyo Dwi Rachmadi Calvin Prasetyo Chaniago, Sabaruddin Charismayani Charismayani Chorina Ika Ristanti Damayanti, Elok Debora Tambunan Deni Astika Derry Hanriansyah Pratama Deska Deska Devia Febrina Dewi Indah Pratiwi Dewi Rafiah Pakpahan Dhamala Shobita Chandra Dhanang Hayuningwang Dingot Hamonangan Sitanggang Dion Julio Iskandar Dovy Reyandi Drastinawati Drastinawati Dwi Yerlis Rahmi Edy Saputra Effendi, Ihsan Elvira Sitna Hajar Emizatul Aini Ervina Ervina Esty Octiana Sari Fadhil Mubarak Fajril Akbar Fernando Susilo Fisy Amalia Gading Bagus Mahardika Gede Indra Ludy Wirata Gunawan Atmaja Halim Wijaya Heni Sugesti Herry Novriansyah I Wayan Sudiarta Idral Amri Ika Agustina Ika Karina Ika Puspa Satriany Ilham Habib Indah Fitriani Indra Yasri Indrawan Indrawan Ines Indriyani Irdoni HS Irdoni Irdoni Irwan Ahussalim Jabosar Ronggur Hamonangan Panjaitan Jannatin Ardhuha Jayaun Jayaun Jenial S Jenni Kristina Br Panjaitan Jessica Andre Julharmito Julharmito Junaidi Junaidi Kania Farida Komalasari Komalasari LALU RUDYAT TELLY SAVALAS Lathifah Cahyani P3 Lia Yuningsih Lilis Suriani Luci Octaria M Satria Haruda M. Ferdinansyah M. Zamroni Mahendra Aswit Sandra Barata Manda Dwipayani Bhastary Marlinda Martin Maya Andiriani MAYANG SARI Mega Safana Mega Sanjaya Melda Helena S Miftah Anugrah Mochamad Reizal Ath Thariq Moh. Tahang Mona Lisa Muchlis Ade Putra Muh Irwan Muhamad Hendri Diarta Muhamamad Rizky Zuriadi Muhammad Hamdani Mustika Canra MUTIARANI MUTIARANI Nanda Nabila Maharani Nasib Nisa Mulya Nissa Aqhilla Novika Sri Wardani Novirsari, Emma Nuraina Siregar Nurjamilah Nursyaniati Nursyaniati Nurul Afifah Ongky Alexander Opik Hidayat Abdul Latif Padil Pancasila Putri Peter Peter Puji Rahayu Purnama Sari Putri Arini Putri Julia Maemum Putri Rahmadani Rahmad Rasyidin Ramadani Pardian Ramadhana Eka Rani Handayani Rathesa Najela Ratih Amelia Rawdatul Fadila Reny Novianti Ridho Hafizh Maulana Ridho Wijaya Riki Rahmadhan Riko Ervil Rio Andika Rizky Gimnastiar Robin Roni Juliansyah Rozanna Sri Irianty Rusydy ' Sai Vinodhini Samsoni Samsoni Septiana Veronika S Septianing Tyas K Silvia Reni Renti Silvia Reni Yenti Silvia Reni Yenty Sintia Siska Priscillia Aledya Siti Chotijah Siti Nurkhaliza Sri Murda Niati Subkhan Maulana Sunarno Sunarno Syarifuddin Oko Syelvia Renni Yenti Thomson Simanjuntak Thufail Mujaddid Al-Qoyim Tina Linda Toni Ardi Ulfa Dwiyanti Ulfah Naida Marbun Wan Elsa Novtari Adiani Wasty Rusjaya Wilda Zakiah Wiriyan Jordy Wyda N Saragi Yelmida Azis Yesi Afriani Yopy Ratna Dewanti Yuli S Yunus Olivia Novanto Zubair Arza Zuchra Helwani Zulkarnain Lubis Zultiniar Zultiniar