Article Per Year (5 Year)
p-Index From 2021 - 2026
3.907
P-Index
This Author published in this journals
All Journal Jurnal Ilmu Dasar Rekayasa Mesin Journal of Engineering and Technological Sciences ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Litbang Industri INOVTEK POLBENG Spektra: Jurnal Fisika dan Aplikasinya SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Agroteknika Mechanical Engineering for Society and Industry Journal of Mechanical Engineering, Science, and Innovation Kolaborasi Jurnal Pengabdian Masyarakat Jurnal Litbang Industri Journal of Applied Agricultural Science and Technology Journal of Fibers and Polymer Composites Borobudur Engineering Review Medani : Jurnal Pengabdian Masyarakat Jurnal Pengabdian Masyarakat dan Riset Pendidikan Jurnal Polimesin
Mochamad Asrofi
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Jember
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

Published : 30 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 30 Documents
Search

 1   2   3 
PENGARUH ARUS PLASMA DAN LAJU ALIRAN GAS PADA MESIN DC THERMAL PLASMA TERHADAP KARAKTERISTIK PARTIKEL NANO Zno Dedi Dwilaksana; Prayogo Alim Pangestu; Andi Sanata; Sumarji .; Mochamad Asrofi; Mahros Darsin; R. Puranggo Ganjar Widityo
STATOR: Jurnal Ilmiah Teknik Mesin Vol 5 No 1 (2022): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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

Abstract

Nanopartikel adalah partikel yang berskala nanometer atau 10-9. Dalam penelitian ini nanopartikel ZnO berhasil terproses dengan metode DC Thermal Plasma, ukuran partikel yang dihasilkan cukup bagus. Kombinasi plasma sangat mempengaruhi morfologi nanopartikel, proses yang terjadi hanya memerlukan sangat singkat. Dimulai dari serbuk Zn yang didorong untuk masuk ke dalam arc plasma dan terjadi proses liquid, oxidation and kristalin. Ukuran kristal yang dihasilkan untuk puncak hkl tertinggi dimulai dari 42-50nm. Parameter kisi kristal yang diperoleh adalah a= 0,2610347nm dan c= 0,782935. Struktur kristal yang dihasilkan adalah hexagonal dan space group P63MC.
Metal Oxides as Soluble Nano Catalyst on Biodiesel: A Review Setyo Pambudi; Agus Triono; Mochamad Asrofi; Iid Mufaidah; Yeni Variyana; R. A. Ilyas
Journal of Applied Agricultural Science and Technology Vol. 5 No. 2 (2021): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (737.656 KB) | DOI: 10.32530/jaast.v5i2.27

Abstract

Nano particles of metal oxide developed as soluble nano additive in liquid fuels to improve fuel quality. One application of nano metal oxide particles is an additive to biodiesel. Biodiesel is an alternative fuel that can reduce dependence on fossil fuels. Pure biodiesel has a relatively lower calorific value compared to fossil fuels. Low calorific value results in increased brake specific fuel consumption. Moreover, biodiesel has a higher density and viscosity compared to fossil fuel. The content of carbon monoxide (CO), unburned hydrocarbons (HC) and nitrogen oxide (NOx) in exhaust gases with biodiesel is higher than fossil fuels. Metal oxide nanoparticles are added to biodiesel between 6 to 80 nm with concentrations about 50 to 500 ppm. Addition of metal oxide nanoparticles to biodiesel can improve brake thermal efficiency, reduce brake specific fuel consumption, carbon monoxide (CO), unburned hydrocarbons (HC), nitrogen oxide (NOx) and improve carbon dioxide (CO2) emission due to the catalytic effect of metal oxide nanoparticles. Metal oxide acts as an oxidation catalyst thereby reduce the carbon combustion activation temperature and thus enhances hydrocarbon oxidation, promoting complete combustion. Nanoparticles that are often used in various studies are nickel (II) oxide (NiO), cerium (IV) oxide (CeO2), titanium oxide (TiO2), zinc oxide (ZnO), aluminum oxide (Al2O3), and silicon dioxide (SiO2). This review paper describes the progress and development of nano metal oxide applications as additives for biodiesel, and the discussion in this paper is divided into 3 main topics, including the effects of nanoparticles on the properties of biodiesel, engine performance, and emission characteristics.
Studi Kelayakan Fiberglass Sebagai Pengganti Kayu Dalam Pembangunan Kapal Nelayan Daerah Bengkalis Pesisir Siswandi B; Jamal J; Jupri J; Mochamad Asrofi; Setyo Pambudi
Borobudur Engineering Review Vol 1 No 2 (2021): Mechanical and Industrial Engineering Research
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/benr.5386

Abstract

Pada umumnya kapal nelayan masyarakat bengkalis terbuat dari kayu. Permasalahan yang dihadapi oleh masyarakat adalah ketersediaan material kayu sebagai bahan baku kapal nelayan saat ini semakin menipis, sehingga diperlukan adanya alternatif material dalam pembangunan kapal nelayan. Berdasarkan hal-hal tersebut maka dilakukan evaluasi dan analisa berkaitan kelayakan material fiberglass sebagai pengganti material kayu dalam pembangunan kapal nelayan. Dengan menggunakan analisis SWOT dilakukan analisa kelayakan fiberglass sebagai pengganti material kayu. Hasil analisa matrik evaluasi faktor internal nilai total faktor didapatkan sebesar 0,27 untuk nilai kekuatan dan pada matrik evaluasi faktor eksternal diapatkan total nilai sebesar 1,62 untuk nilai peluang. Dari nilai tersebut dapat diketahui bahwa fiberglass dapat dijadikan atau layak sebagai material pengganti kayu dalam pembangunan kapal nelayan
Studies on Tensile Strength, Fracture Surface and Biodegradation of Biocomposite from Polyvinyl Alcohol (PVA) Filled by Sugarcane Bagasse Fiber Mochamad Asrofi; Reza Marinanda Fajar; Dwi Djumhariyanto; Salahuddin Junus; R. A. Ilyas; M. R. M. Asyraf; L Rajeshkumar
Journal of Fibers and Polymer Composites Vol. 2 No. 1 (2023): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v2i1.75

Abstract

Synthetic plastic is a material that is difficult to decompose in the environment and causes serious problems in long term such as an increase in the volume of waste. To reduce plastic waste, biodegradable composite (biocomposite) is expected to overcome this problem. Natural cellulose fiber can be used as a filler in biopolymer matrix based biocomposite. This study aims to determine the tensile properties, fracture morphology, and biodegradation rate of biocomposite from Polyvinyl Alcohol (PVA) and sugarcane bagasse fiber. The test of biocomposite samples was carried out with a tensile test, scanning electron microscopy (SEM), and soil burial test. The results show that the highest tensile strength and modulus elasticity was in PVA pure film for 2.15 MPa and 3.468 MPa, respectively. The addition of cellulose fiber from sugarcane bagasse in the PVA matrix does not have a strengthening effect on the tensile strength of the biocomposite. This is due to the presence of porosity, agglomeration, and poor bonding between the matrix and fiber according to the SEM observation. The biodegradation rate showed that all biocomposite samples were degraded in the soil and had weight loss above 40% after 15 days of burial in the soil.
Effect of current, time, ethanol concentration, and pH electrolyte on ZnO coated carbon fiber using electrochemical deposition method Salahuddin Junus; Gindeka Bimara Aryantaka; Rizky Akhmad Prayogi; Mochamad Asrofi; Rahma Rei Sakura; R. Puranggo Ganjar Widityo; Robertus Sidartawan
Mechanical Engineering for Society and Industry Vol 3 No 2 (2023)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.10493

Abstract

One of the recent developments in carbon fiber is using nano zinc oxide (ZnO) as a coating on carbon fiber to create piezoelectric materials. Piezoelectric materials can generate electricity when subjected to mechanical pressure or strain, and vice versa. ZnO nanomaterials have been a focal point of research due to their high surface-to-volume ratio and high reactivity. This study reported on the use of ZnO for coating agents in carbon fiber sensors. The novelty in this research is the composition of current, time, ethanol concentration, and pH electrolyte to produce the optimum composition of piezoelectric material. The process was conducted using an electrochemical method, which converts electrical energy into chemical energy through electro-deposition. This study considers four independent variables: electrolyte current (1.2 A and 1.4 A), electrolyte pH (2.0, 4.0, and 6.0), ethanol concentration (70% and 96%), and coating duration (90, 180, and 270 seconds). The results show that 1.4 A produces the highest average voltage, followed by electrolyte pH 6 and 70% ethanol concentration. The best coating time was 270 seconds producing the highest average voltage. Micro and SEM confirm that 1.4 A produced a thicker and more uniform layer compared to 1.2 A. High pH, 70% ethanol concentration, and longer coating time also contributed to the formation of thicker layers. XRD test shows that the layers formed had amorphous and hexagonal crystal structures. The average crystal diameter size varies depending on the combination of independent variables used in the coating process. With these results, piezoelectric has potential as a pulse sensor material.
Optimization of electroplating thickness results for SS400 steel using the Taguchi method Ahmad Adib Rosyadi; Firman Gustiawan; Mahros Darsin; Yuni Hermawan; Mochamad Asrofi
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i2.2860

Abstract

SS400 steel is steel with a low carbon content (max 0.17 %C) or low carbon steel. SS400 applications are widely used in the construction industry, railway industry, bridges and others. The use of SS400 which is in direct contact with the surrounding environment will cause the appearance, quality, and usefulness of the material or material to decrease. One way to prevent and improve metal performance is electroplating. This study used SS400 carbon steel with chrome coating. The parameters in this study are a voltage of 3, 6, and 9 Volts; the temperature of 45, 50, and 55 oC; and the time of 20, 25, and 30 minutes. The Taguchi method L9(33) was used to design the experiments. Analysis of variance (ANOVA) shows that factors of chroming time, voltage, and temperature contribute to coating thickness at the level of 40.615%; 24.951%; and 10.369%, respectively. The maximum thickness of 47.340 µm could be achieved when using combination factors of plating time of 30 minutes, at 9 Volts, and keeping the temperature of the solution at 50 oC.
Effect of Temperature, Holding Time, and Addition of Sn on Density on Metal Injection Molding Sintering Process Wardatul Jannah; Danang Yudistiro; Mochamad Asrofi; Mahros Darsin; Ahmad Rendi Maulana
Journal of Engineering and Technological Sciences Vol. 55 No. 2 (2023)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2023.55.2.4

Abstract

Metal injection molding (MIM) is a metal forming technique that combines powder metallurgy with plastic injection molding. MIM is very efficient in manufacturing small and complex products in large quantities. The MIM process has four steps: mixing, debinding, injection molding, and sintering. This research was conducted to determine the effect of variations in Sn addition, temperature, and holding time on the density of Al-PP products after the sintering process. Density is mass per volume so to find out the volume of Al-PP products, the use of a 3D scanner was attempted along with the EinScan application and a mesh mixer. The Taguchi method was used for data processing to determine the influence of variations in Sn addition, temperature, and holding time on density. The calculation of the percentage contribution showed that variations in Sn addition, temperature, and holding time affected density by 47%, 21%, and 3%. Also, 2% Sn addition yielded a reasonably good microstructure formation compared to without Sn addition and 1% Sn addition, where many voids remained in the specimen (the more significant the voids, the lower the density).
Penigkatan Kualitas Produk Material Komposit Fiberglass Menggunakan Vaccum Assisted Resin Infusion di Industri Wangi Fiberglass Banyuwangi Asrofi, Mochamad; Dwilaksana, Dedi; Sakura, Rahma Rei; Junus, Salahuddin; Hentihu, M. Fahrur Rozy; Yudhistiro, Danang; Syuhri, Skriptyan Noor Hidayatullah; Taufik, Taufik
Medani : Jurnal Pengabdian Masyarakat Vol. 2 No. 3 (2023): Desember 2023
Publisher : Lembaga Riset Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59086/jpm.v2i3.366

Abstract

Pembuatan komposit sebagai pengganti material logam membutuhkan teknologi sebagai penunjang produksi sehingga menghasilkan banyak produk dengan kualitas yang bagus. Bahan komposit mempunyai beberapa keunggulan diantaranya massa jenis ringan dan sifat mekanik yang baik. Umumnya, bahan komposit terdiri dari dua penyusun yaitu matriks dan fiber. Matriks berfungsi sebagai pengikat dan fiber berguna sebagai penguat struktur komposit. Metode pembuatan produk tersebut yaitu vaccum, casting, dan hand lay-up. Hasil menunjukkan produk komposit dengan vaccum assisted resin infusion (VARI) mempunyai kualitas yang baik dan minim cacat dibandingkan dengan casting dan hand lay-up. Metode VARI dapat diaplikasikan di industri manufaktur komposit fiberglass. The fabrication of composites as a substitute for metal materials requires technology to support the production to produce many products with good quality. Composite materials have several advantages, including light density and good mechanical properties. Generally, composite materials consist of two components, namely matrix and fiber. The matrix functions as a binder and the fiber is useful as a reinforcement for the composite structure. The fabrication methods of these products are vacuum, casting, and hand lay-up. The results show that composite products with vacuum-assisted resin infusion (VARI) have good quality and minimal defects compared to casting and hand lay-up. The VARI method can be applied in the fiberglass composite manufacturing industry.
EFFECT OF VOLUME FRACTION OF GENETICALLY MODIFIED ORGANISM (GMO) SUGARCANE BAGASSE FIBER ON THE MECHANICAL PROPERTIES AND MORPHOLOGY OF BIOCOMPOSITE Anuary Dwi Rosyid, Wafa Prasetia; Sakura, Rahma Rei; Djumhariyanto, Dwi; Asrofi, Mochamad; Setyawan, Digdo Listyadi; Sugiharto, Bambang; Junus, Salahuddin; Dwilaksana, Dedi
ROTOR Vol 16 No 2 (2023)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v16i2.41551

Abstract

Science and technology are currently developing in all fields, such as vehicle construction, building construction, industry, and materials engineering. Especially in the field of material engineering used for the manufacture of composite materials. Currently the transition of materials from metal to composites is also in great demand in various fields including in the automotive, transportation, shipping, aerospace, health, and various other fields. In the components of a vehicle, the components that have the most potential to be reduced are the main structural components, namely the floor, body, and ribs. Efforts to reduce the weight of the material in these components are carried out to reduce the amount of fuel consumption, so the ratio of strength and density of a material is one of the important properties that needs to be considered. This study used the hand lay up method with a comparison of volume fraction variations of 15%: 85% and 20%: 80%. With the aim of adding volume fractions with optimal combinations, it is hoped that the tensile strength will get better. The highest average tensile strength is with a volume fraction ratio of 15%: 85% of 19.04 MPa. While the lowest average tensile strength is with a volume fraction ratio of 20%: 80% of 17.78 MPa. It can be concluded that with increasing fiber volume fraction, the tensile strength decreases. This happens because there are several defects in the form of holes and voids which indicate poor bonding between the fibers and the matrix. Keywords: PRG sugarcane fibers, volume fraction, epoxy, tensile properties
FTIR and Moisture Absorption of Yam Bean Starch Biocomposites with Yam Bean (Pachyrhizus erosus) Bagasse Fibers as Reinforcement Mahardika, Melbi; Abral, Hairul; Kasim, Anwar; Arief, Syukri; Asrofi, Mochamad
Jurnal ILMU DASAR Vol 19 No 2 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (405.738 KB) | DOI: 10.19184/jid.v19i2.7255

Abstract

Biocomposites from yam bean starch with yam bean bagasse (YBB) fibers as reinforcement has been successfully fabricated. The fabrication method was solution casting. YBB was variated for 1, 2, 3 and 4wt% (from dry weight starch basis). 2 mL glycerol was used as a plasticizer. The relative humidity (RH) condition in moisture testing was 99%. The result shows that the addition YBB able to decreased moisture absorption of starch film. The lowest moisture absorption was in biocomposites with 4wt% YBB. The moisture absorption test was supported byfourier transform infrared (FTIR) data.Keywords: Biocomposite, yam bean, yam bean bagasse, moisture, FTIR
Co-Authors Abral, Hairul Aditya, Tsabit Adjar Pratoto, Adjar Afril Priyanto Agus Triono Agus Triono Agus Triono Ahmad Adib Rosyadi Ahmad Rendi Maulana Ahmad Rendi Maulana Alahmadi, Mohammed Andi Sanata Anuary Dwi Rosyid, Wafa Prasetia Anwar Kasim APRIANDY, KEVIN ILHAM Aris Zainul Muttaqin Bambang Sugiharto Danang Yudistiro Danang Yudistiro Dedi Dwilaksana Devita Amelia Digdo Listyadi, Digdo Dominic C. D., Midhun Dwi Djumhariyanto Fatah, Ghaibi Alimul Fikri, Azhar Firdausah, Risco Eka Firman Gustiawan Gindeka Bimara Aryantaka Hardiatama , Intan Hary Sutjahjono Hermawan , Yuni Iid Mufaidah Ilyas, R. A. Ilyas, Rushdan Ahmad Ismet Hari Mulyadi Ismono, Firman Ema Jamal Jamal Joni Anggianto Jupri J Karisma, Muhamat Dwi L Rajeshkumar M. Fahrur Rozy Hentihu M. R. M. Asyraf Mahardika, Melbi Mahros Darsin Melbi Mahardika Melbi Mahardika Melbi Mahardika Mochammad Edoward Ramadhan Muhammad Abduh Muhammad Yusuf Mumtadz Zaid Bin Tsabit Murtadho, Nizam Alfi Nasrul Ilminnafik Nizam Alfi Murtadho Pradiza, Revvan Rifada Prayogo Alim Pangestu Puranggo Ganjar Widityo Puranggo Ganjar Widityo R. A. Ilyas Rahma Rei Sakura Reza Marinanda Fajar Rizky Akhmad Prayogi Robertus Sidartawan Salahuddin Junus Santoso Mulyadi Setyo Pambudi Setyo Pambudi Setyo Pambudi Setyo Pambudi Siswandi B Siswantoro, Dwi Heru Soesatijono Soesatijono Sujito Sujito Sumardi Sumardi Sumarji Syuhri, Skriptyan Noor Hidayatullah Syukri Arief Taufik Taufik Tsabit, Mumtadz Zaid Bin Variyana, Yeni Wardatul Jannah Wibowo, Robertoes Koekoeh Koentjoro Yani, Luluk Fitri Yayang Saif Izzudin Yudhistiro, Danang Yuni Hermawan Zul Nain