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All Journal Jurnal Teknoin TEKNIK Rotasi Prosiding Semnastek Jurnal Rekayasa Mesin Automotive Experiences Journal of Biomedical Science and Bioengineering Makara Journal of Technology Muslim Business and Economic Review
Muhammad Khafidh
Jurusan Teknik Mesin, Fakultas Teknologi Industri, Universitas Islam Indonesia
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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RANCANG BANGUN ALAT PENGUPAS KULIT BIJI MELINJO UNTUK PENGEMBANGAN USAHA MIKRO KECIL DAN MENENGAH DI DESA MESOYI KECAMATAN TALUN KABUPATEN PEKALONGAN Muhammad Khafidh
Teknoin Vol. 20 No. 4 (2014)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v20i4.7450

Abstract

Melinjo merupakan salah satu jenis tanaman perkebunan yang cukup banyak terdapat di Indonesia, khususnya di pulau Jawa. Melinjo banyak dimanfaatkan bijinya untuk diolah menjadi emping. Desa Mesoyi merupakan salah satu sentra penghasil melinjo di Kabupaten Pekalongan. Hal itu yang membuat di Desa Mesoyi terdapat banyak UMKM yang bergerak dalam bidang pengolahan melinjo menjadi emping. Namun pengolahan melinjo menjadi emping di banyak UMKM masih menggunakan cara tradisional sehingga produktivitasnya masih relatif rendah. Proses pembuatan emping dimulai dari penjemuran melinjo sehingga menjadi melinjo klatak, proses sangrai, pengupasan kulit keras, pemipihan dan terakhir dijemur untuk menjadi emping yang siap dipasarkan. Dalam penelitian ini akan difokuskan pada pembuatan paket teknologi tepat guna untuk proses pengelupasan kulit keras. Hasil yang diperoleh menunjukkan bahwa produktivitas alat pengupas kulit biji melinjo mencapai 39,6 kg per jam atau meningkat 6 kali lipat dibandingkan proses manual yang hanya mencapai 6,36 kg per jam. Dari segi konsumsi listrik, alat ini membutuhkan biaya Rp 831,37 per hari dengan asumsi penggunaan alat selama 6 jam per hari. Efisiensi alat pengupas kulit biji melinjo ini  adalah 86,5%
Analisis Sifat Mekanik Karet Silikon sebagai Kandidat Prepusium Sintetik pada Alat Peraga Khitan Muhammad Khafidh; Abdullah Firdaus; Ilham Akbar Velayati
Jurnal Rekayasa Mesin Vol 15, No 3 (2020): Volume 15, Nomor 3, Desember 2020
Publisher : Jurusan Teknik Mesin - Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v15i3.1977

Abstract

Khitan atau sunat (sirkumsisi) merupakan proses tindakan medis berupa pembuangan sebagian dari kulit luar penis (prepusium) yang membungkus kepala penis (glans). Di Indonesia, khitan banyak dilakukan pada anak laki-laki ketika mencapai masa usia 7 sampai 12 tahun. Tindakan khitan dapat dilakukan oleh berbagai profesi tenaga kesehatan, seperti dokter, perawat, dan mantri sunat. Untuk melatih keterampilan tindakan khitan, salah satu metode yang dapat digunakan adalah dengan menggunakan alat peraga khitan sebagai sarana latihan memotong dan menjahit kulit penis. Tetapi, alat peraga khitan masih minim ditemukan di Indonesia. Salah satu poin penting dari alat peraga khitan adalah adanya kulit sintetis yang sifat mekaniknya mirip kulit asli agar ketika latihan memotong dan menjahit mempunyai feeling yang sama. Penelitian ini bertujuan untuk membuat dan menganalisis sifat mekanik karet jenis silikon sebagai material pengganti prepusium pada alat peraga khitan. Pengujian sifat mekanik dari prepusium dan karet silikon menggunakan Dynamic Mechanical Analyzer (DMA). Hasil penelitian menunjukkan modulus elastisitas prepusium dan silikon mempunyai tren yang sama, tetapi mempunyai nilai eksak yang berbeda. Berdasarkan hasil survei yang dilakukan terhadap beberapa praktisi khitan di Yogyakarta, kulit sintetis mudah dipotong dan dijahit serta mempunyai feeling yang mendekati sebenarnya.
ANALISA KARAKTERISTIK MINYAK PELUMAS JENIS 15W-40 PRODUK DALAM NEGERI MENGGUNAKAN TRIBOMETER PIN-ON-RING Muhammad Khafidh; Jamari Jamari
Prosiding Semnastek PROSIDING SEMNASTEK 2014
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Kemampuan  mesin  dalam mempertahankan  performa terhadap  penggunaan  berulang  merupakansalah satu hal penting dalam perancangan permesinan. Gesekan antar komponen mesin yang salingkontak  menjadi  fenomena  yang  sering  menyebabkan  penurunan  performa  dari  mesin.  Hal  itudisebabkan oleh terjadinya aus pada komponen yang saling kontak tersebut. Salah satu cara yangefektif  untuk  mengurangi  keausan  komponen  adalah  dengan  memberikan  pelumas.  Minyakpelumas mempunyai karakteristik yang berbeda-beda disesuaikan dengan penggunaan dan kondisilingkungannya. Kurva Stribeck merupakan kurva  hubungan  antara  koefisien  gesekan  danlubrication  number yang dapat digunakan  untuk  mengetahui  karakteristik  dari  minyak  pelumas.Pelumas jenis 15W-40 merupakan salah satu jenis pelumas yang cocok digunakan di iklim tropisseperti di  Indonesia. Penelitian  ini  akan  difokuskan  pada  analisa  kurva  Stribeck  pelumas  jenis15W-40  produk  dalam  negeri  menggunakan  tribometer pin-on-ring. Pengujian  dilakukan  darikecepatan  2-250  rpm  dengan  temperatur  dikondisikan  40oC,  beban  yang  diberikan  100  N,  danviskositas yang digunakan 0,09924 Pa.s. Penelitian dilakukan selama kondisi running-in, yaitu darikondisi  awal  sampai  kondisi  tunak  (steady  state).  Hasil  yang  diperoleh  menunjukkan  bahwakondisi running-in terjadi  sampai pada  pengujian  keenam.  Semakin  besar  kecepatan  yangdiberikan,  maka  koefisien  gesek  yang  dihasilkan  semakin  kecil. Regime yang  terbentuk  dalamkurva Stribeck pada penelitian ini adalah boundary lubrication dan mixed lubrication.
A Preliminary Study on the Design of C-Section Props Dowy Pratama Sita; Muhammad Khafidh
Journal of Biomedical Science and Bioengineering Vol 1, No 2 (2021)
Publisher : Center for Biomechanics, Biomaterials, Biomechantronics and Biosignal Processing (CBOIM3S)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (311.551 KB) | DOI: 10.14710/jbiomes.2021.v1i2.54-58

Abstract

A cesarean section (c-section) is a surgical procedure aimed to deliver a baby by opening the abdominal wall and uterus. Now, c-section is one of the choices that are often chosen by mothers when giving birth. The knowledge and skills of c-section are important in education that focuses on obstetrics and obstetrics, especially for prospective specialist doctors taking the title of Specialist in Obstetrics and Gynecology (SpOG). Residents are required to be able to understand the procedure of c-section both in theory and practice. To train and improve c-section skills, one of the methods used is to use c-section props. This study aims to design and manufacture c-section props that resemble actual conditions and can be used repeatedly. The cesarean section props consist of three main parts, namely the abdominal body, the uterus, and the synthetic skin layer of the abdomen. The product master uses 3D printer results with PLA filament material. The props are made of RTV-48 silicone rubber and Polyurethane Foam with a mold made of fiberglass composite using the Hand Lay-UP method. The c-section props produced can provide an overview of the general cesarean surgery procedure.
Modified Design of Pin-on-Ring Tribometer for Hip Joint Prostheses Measurement; Case Study on Salat Activity Khafidh, Muhammad; Jamari, Jamari; Sulardjaka, Sulardjaka; Tauviqirrahman, Mohamad; Heide, Emile van der
Makara Journal of Technology Vol. 18, No. 3
Publisher : UI Scholars Hub

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Abstract

Total hip replacement (THR) is one of the most successful orthopedic surgical procedures for replacing a broken hip joint. In THR, wear may occur at the articulating surface of the acetabular cup and the femoral head. In Indonesia, the country with the largest Muslim population in the world, most of the inhabitants do salat (praying) every day. THR users are banned from doing salat for fear it will damage the hip joint prostheses. The previous wear calculation methods on the hip joint prostheses use the gravimetric, coordinate measuring machine (CMM), profiler, and geometric method. The disadvantages of the previous methods are that the geometry of the wear patch and the wear volume are only known at the end of the experiment, so they cannot be used to calculate the specific wear rate values in real time. So far, in every modeling of the hip joint prostheses, the values of the specific wear rate are assumed to be constant. This paper reports on the design modification of a pin-on-ring tribometer that is used to measure the wear volumes in hip joint prostheses. The result shows that modifications of the femoral head holder, reciprocating motion, elastic joint, and extra displacement transducer is needed to get the specific wear rate value. The calculation method to find the delta volume that is the value of displacement less than the displacement minimum (δmin) is based on a graph, while the calculation method to find the delta volume that is the value of displacement that is more than the displacement minimum (δmin) is based on an equation. In the salat test protocol, the longest test time was during the sujud (prostration) motion, which took 1034.17 minutes in the experiment.
A Study on Characteristics of Brake Pad Composite Materials by Varying the Composition of Epoxy, Rice Husk, Al2O3, and Fe2O3 Khafidh, Muhammad; Putera, Finny Pratama; Yotenka, Rahmadi; Fitriyana, Deni Fajar; Widodo, Rahmat Doni; Ismail, Rifky; Irawan, Agustinus Purna; Cionita, Tezara; Siregar, Januar Parlaungan; Ismail, Nur Hidayah
Automotive Experiences Vol 6 No 2 (2023)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9121

Abstract

The use of composite materials in brake pads is becoming increasingly popular due to their high-performance characteristics, including good thermal stability, high wear resistance, and low noise generation. However, the development of new composite materials that offer even better performance is still an ongoing research area. In this study, the composite was made by hand layup method using epoxy resin as matrix material, with rice husk, Al2O3, and Fe2O3 as reinforcing materials. The composition of the composites was varied by changing the percentage of the reinforcement materials. The composites were then subjected to several characterization tests, including density, hardness, flexural strength, thermal analysis, Scanning Electron Microscopy (SEM), TGA/DSC, and wear testing. The test results showed that additional reinforcement materials to the epoxy resin matrix improved the mechanical properties of the composites. Overall, the study demonstrates that a hand layup method is a viable approach for preparing brake pad composite materials and that the addition of rice husk, Al2O3, and Fe2O3 can improve the mechanical properties of the composites. The best properties produced in this research were found in one of the specimens which used epoxy, rice husk, Al2O3, and Fe2O3 with a composition of 50 wt.%, 20 wt.%, 15 wt.%, and 15 wt.%. However, the addition of rice husk also provides wear resistance and thermal stability. This study contributes to the Sustainable Development Goals (SDGs) by advancing innovation, promoting sustainability, and reducing emissions in automotive industry applications.
Optimasi Multi Faktor pada Formula Karet Alam terhadap Gesekan Material Elastomer Karet Alam untuk Aplikasi Telapak Kaki Prostesis Khafidh, Muhammad; Irfan, Afi Muhammad; Suryawan, Donny; Kistriyani, Lilis; Ismail, Rifky
TEKNIK Vol. 44, No. 3 (2023): December 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i3.58024

Abstract

Indonesia is the world's second-largest producer of natural rubber. Various products can be made of natural rubber. One of them is a foot prosthesis. An essential criterion for foot prosthesis is a significant value of friction force to prevent slip during usage. The present study optimizes natural rubber formulation to obtain the largest friction force value. A pin-on-disk tribometer is used to obtain friction force values. The optimization method used in the present study is Taguchi Method Orthogonal Array L9, while the contribution of each control factor to increase friction is carried out using ANOVA analysis. Four control factors are used in this study: the type of natural rubber, the percentage of silica powder, the percentage of sulfur, and the vulcanization temperature. Each control factor has three different levels. The test results showed that the optimum formulation to obtain the highest friction value is a mixture of concentrated natural rubber and instant natural rubber, 30 phr of silica powder, 5 phr of sulfur, and 150°C of vulcanization temperature. The friction force of the optimum formulation increases by 33% compared to the baseline formulation. ANOVA analysis shows that the vulcanization temperature is the most crucial factor in increasing the friction force, contributing 62.58%.
Analisis Sifat Mekanik dan Tribologi pada Cakram Baru dan Bekas Khafidh, Muhammad; Dhewanto, Santo Ajie; Kasim, Muhammad Alfaarisi Maulana; Purwaningrum, Yustiasih
ROTASI Vol 25, No 4 (2023): VOLUME 25, NOMOR 4, OKTOBER 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.4.14-22

Abstract

Proses pengereman pada kendaraan mempunyai dua komponen penting, yaitu piringan cakram dan kampas rem. Kontak antara cakram dan kampas rem diharapkan mempunyai gesekan yang cukup untuk mengurangi kecepatan kendaraan. Selain itu, keausan dari cakram dan kampas rem harus diminimalkan untuk memperpanjang umur komponen. Di Indonesia, banyak pemilik kendaraan yang memutuskan untuk mendaur ulang material cakram ketika cakram sudah aus. Dari sudut pandang lingkungan, hal ini akan mengurangi limbah dan jejak karbon dioksida. Namun, kinerja keselamatan dari cakram daur ulang tersebut belum banyak diteliti. Dalam penelitian ini akan dianalisis kinerja mekanik dan tribologi berbagai jenis bahan cakram, baik cakram baru maupun yang daur ulang. Bahannya ada empat, yaitu cakram baru (Ba), cakram bekas (Be), cakram bekas + sekrap (BeS), dan cakram bekas + sekrap + ampplas (BeS Amplas). Analisis yang dilakukan meliputi kekerasan, kekasaran, massa aus, koefisien gesek, dan temperatur. Hasil penelitian menunjukkan bahwa kekasaran permukaan material Be lebih rendah dibandingkan material Ba, sedangkan material BeS memiliki kekasaran kurang lebih 5 kali lebih tinggi dibandingkan material Ba. Kekasaran permukaan material BeS yang tinggi menghasilkan gesekan yang rendah dan keausan yang tinggi. Situasi ini tidak diinginkan untuk aplikasi rem karena mengurangi keselamatan dan masa pakai produk. Pemberian perlakuan amplas pada material BeS dapat meningkatkan kinerja tribologi dan menurunkan suhu kontak.
The Nexus of Environmental Performance and Economic Growth: A Panel Analysis from Organization of Islamic Cooperation Countries Khafidh, Muhammad; Jajang, Jajang; Junejo, Safiullah
Muslim Business and Economics Review Vol. 4 No. 1 (2025)
Publisher : Universitas Islam Internasional Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56529/mber.v4i1.432

Abstract

The climate is changing and the earth is getting hotter. Cutting down rainforests, burning fossil fuels, and farming livestock all contribute to greenhouse gas emissions. Human economy and the natural world are closely connected. This study evaluates the relationship between environmental performance and economic growth using panel data for Asian member states of the Organization of Islamic Cooperation (OIC) for the years 2020 to 2022. Data on Environmental Performance Index and Gross Domestic Product growth were collected from the Yale Center for Environmental Law & Policy and the World Bank. Panel data regression was used by selecting the best parameter estimates from three panel data regression models: Common Effect Model (CEM), Fixed Effect Model (FEM), and Random Effect Model (REM). The study findings are anticipated to enhance nations' consciousness regarding environmental concerns and to enhance their focus on ecologically sustainable economic growth and development trajectories.
Co-Authors Abdullah Firdaus Agustinus Purna Irawan Cionita, Tezara Dhewanto, Santo Ajie Dowy Pratama Sita Emile van der Heide Fitriyana, Deni Fajar Heide, Emile van der Ilham Akbar Velayati Irfan, Afi Muhammad Ismail, Nur Hidayah J. Jamari Jajang Jajang Junejo, Safiullah Kasim, Muhammad Alfaarisi Maulana Kistriyani, Lilis Mohammad Tauviqirrahman Putera, Finny Pratama Rifky Ismail Siregar, Januar Parlaungan Sulardjaka Sulardjaka Suryawan, Donny Yotenka, Rahmadi Yustiasih Purwaningrum