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Abubakar Dabet
Universitas Malikussaleh
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Pengaruh Struktur Model Terhadap Profitabilitas Perusahaan Industri Manufaktur Antoni Antoni; Muhamad Syafii; Al Ikhlas; Abubakar Dabet; Ariyanto. M; Muhdar HM
Innovative: Journal Of Social Science Research Vol. 3 No. 6 (2023): Innovative: Journal Of Social Science Research
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/innovative.v3i6.6155

Abstract

Penelitian ini membahas pengaruh struktur model terhadap profitabilitas perusahaan dalam industri manufaktur. Struktur model melibatkan aspek-aspek seperti struktur kepemilikan, struktur modal, dan struktur organisasi perusahaan. Penelitian ini menggunakan data dari sejumlah perusahaan industri manufaktur yang beroperasi dalam lingkup yang luas. Metode analisis yang digunakan termasuk regresi statistik untuk mengidentifikasi korelasi antara variabel struktur model dan profitabilitas. Hasil penelitian menunjukkan bahwa struktur model memiliki pengaruh signifikan terhadap profitabilitas perusahaan. Struktur kepemilikan yang baik, alokasi modal yang efisien, dan organisasi yang efektif dapat meningkatkan profitabilitas perusahaan secara signifikan. Penelitian ini juga mengidentifikasi faktor-faktor spesifik yang dapat memengaruhi hubungan antara struktur model dan profitabilitas. Penemuan ini memberikan pandangan yang berharga bagi manajemen perusahaan dalam industri manufaktur untuk meningkatkan strategi dan keputusan mereka terkait dengan struktur model. Dengan memahami dampak struktur model terhadap profitabilitas, perusahaan dapat mengoptimalkan sumber daya dan proses operasional mereka untuk mencapai tingkat profitabilitas yang lebih tinggi, sambil tetap berpegang pada prinsip-prinsip etika bisnis.
Aplikasi teknik manufaktur vacuum assested resin infusion (vari) untuk peningkatan sifat mekanik komposit plastik berpenguat serat abaca (AFRP) Abubakar Dabet; Indra Indra; Teuku Hafli
Jurnal POLIMESIN Vol 16, No 1 (2018): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i1.551

Abstract

AbstrakInovasi dalam bidang material komposit menuntut terciptanya material yang lebih ramah lingkungan.  Saat ini komposit serat alam (green material) patut dipertimbangkan menjadi material yang sangat berpotensi untuk mensubstitusi komposit serat sintetis sebagai material teknik. Serat alam mempunyai kekurangan karena mempunyai scatter sifat mekanik yang sangat besar. Salah satu cara untuk mengatasi kekurangan tersebut adalah melalui pemilihan proses manufaktur (fabrikasi) komposit. Tujuan penelitian ini adalah membuat prototype komposit plastik berpenguat serat abaca (AFRP)  menggunakan metode Vakum (Vacum Assested Resin Infusion (VARI)). Semua spesimen dilakukan postcure pada suhu 800 C selama 2 jam. Sifat mekanik dari komposit dievaluasi uji tariknya. Komposit AFRP difabrikasi dengan fraksi volume (Vf) : 20%, 30% , 40%, serta ukuran spesimen uji (140x5x1) mm. Dengan proses fabrikasi sebagai berikut: 1) Serat abaca disusun dalam cetakan kaca yang memanjang sejajar (00) kemudian dimasukkan ke dalam kantong plastik vakum. 2) Resin dicampur hardener dialirkan kedalam cetakan yang sudah kondisi vakum. Metode cetakan ini dapat menghilangkan gelembung udara di dalam komposit sehingga diharapkan kekuatan tarik komposit menjadi lebih tinggi.  Bahan-bahan yang diperlukan dalam penelitian ini adalah: Serat abaca, Resin BTQN 157-EX, Hardener MEKPO dan Wax. Peralatan yang diperlukan adalah: Instalasi cetak vakum, Alat uji tarik, Kamera digital, dan Scanning Electron Microscope (SEM). Penampang patahan diselidiki untuk mengidentifikasi mekanisme perpatahannya.  Hasil penelitian menunjukkan bahwa kekuatan dan regangan tarik komposit memiliki harga optimum untuk (Vf) 40%, yaitu 257 Mpa dan 0.44%.  Penampang patahan komposit diklasifikasikan sebagai jenis patah slitting in multiple area sehingga dapat disimpulkan bahwa komposit plastik berpenguat serat abaca memiliki potensi yang cukup besar untuk diaplikasikan sebagai material struktural. Kata kunci: Serat Abaca, AFRP, Kekuatan tarik, VARI, Scanning Electron Microscope AbstractInnovation in composite materials demands the creation of more environmentally friendly materials. Currently the composite of natural fibers (green material) should be considered to be a material that has the potential to substitute synthetic fiber composites as engineering materials. Natural fibers have disadvantages because they have a very large mechanical properties scatter. One way to overcome these shortcomings is through the selection of a composite manufacturing (fabrication) process. The purpose of this research is to make prototype of plastic composite with abaca fiber (AFRP) using Vacuum Assured Resin Infusion (VARI)). All specimens were performed postcure at 800 C for 2 hours. The mechanical properties of the composites are evaluated by the tensile test. The AFRP composite is fabricated by volume fraction (Vf): 20%, 30%, 40%, as well as test specimen size (140x5x1) mm. With the fabrication process as follows: 1) Abaca fiber is arranged in a parallel laminated glass mold (00) then put in a vacuum plastic bag. 2) The resin in the mixed hardener flowed into a mold that has a vacuum condition. This mold method can remove air bubbles inside the composite so that the expected composite tensile strength becomes higher. The materials needed in this research are: Abaca fiber, BTQN 157-EX Resin, MEKPO and Wax Hardener. The necessary equipment are: Vacuum printing installation, Tensile test equipment, Digital camera, and Scanning Electron Microscope (SEM). Fault cross sections were investigated to identify the fracture mechanism. The results showed that the strength and composite tensile strain had the optimum price for (Vf) 40%, ie 257 Mpa and 0.44%. The composite fault cross section is classified as a type of broken slitting in multiple areas so it can be concluded that the plastic composite of abaca fibers has considerable potential to be applied as a structural material. Keywords: Abaca Fiber, AFRP, Tensile Strength, VARI, Scanning Electron Microscope
Effect of Volume Fraction and Alkalization Treatment on Mechanical Properties of Abaca Fiber Reinforced Composites as a Composite Board Substitute for Wood Products Abubakar Dabet; Zulmiardi Zulmiardi; Ferry Safriwardi
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3125

Abstract

Wood products are very popular products, especially in Indonesia. The drawback of wood products lies on their physical properties which are very susceptible to weathering in contact with water, causing wood products to be unsuitable for placing in parts of higher moisture. In addition, deforestation for processing wood products causes prolonged environmental damage. The main objective of this research is to make abaca fiber polyester composite material that can be used as a composite board for replacing wood product boards. The composite is made with varying the alkali solution treatment and fiber volume fraction by using the vacuum method (VARI).  Materials used in this study are abaca banana fiber, polyester resin, hardener and wax. The primary equipment used are such as tensile testing machine, freis machine, scanning electron machine (SEM), press machine, vacuum installation and digital scales as well as other supporting tools for composite preparation and fabrication. The research design for the preparation of composite test specimens used a polyester matrix and Abaca fiber reinforcement. Variation of alkalization solution used have rate of 1%, 3%, 5%, 7%, and 9%, and the volume fraction of abaca fiber is at 15%, 20%, 25%, 30% and 35%. The composite specimens test uses a tensile test ASTM D3039-76 standard, flexural test using the ASTM D790 standard and an impact test reaching the Charpy method. The results showed there are the highest tensile strength and modulus of elasticity were obtained from composites with specifications of 25%Vf and 5% alkali treatment of 186.89 MPa with a modulus of elasticity of 2.27 GPa. The highest bending strength value is found in the composite with a specification of 35%Vf and 5% alkali treatment with a bending strength value of 53,03 MPa. The highest impact strength value was found in the composite with a specification of 25%Vf and alkali treatment with a 5% concentration of 9,32 kJ/m2. Based on the mechanical properties data above, the composite specifications can be recommended for the manufacture of composite boards as a substitute for wood products at 35%Vf and 5% alkali treatment. 
The Effect of Varying Torrefaction Temperature on the Physical and Mechanical Properties of Briquettes Made from King Grass Rifanida Rifanida; Adi Setiawan; Shafira Riskina; Abubakar Dabet; Alchalil Alchalil
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3274

Abstract

Indonesia is a country which has rich biological diversity. King grass (Pennisetum Purpupoides) is one of biological species which easily grow but has not yet been optimally used. This study examined the physical, mechanical, and thermal properties of bio-briquettes produced from king grass which has been torrefied at temperatures of 150˚C, 175˚C and 200˚C. Prior to torrefaction process, fresh king grass was chopped to a size 3 cm, dried under the sun for five days, and then put into the torrefaction reactor with a residence time of 45 minutes. The resulting solid product, i.e. bio-char was then pulverized and sieved to a particle size of 40 mesh, then mixed with 20% wt binder and stirred manually to reach homogeneous. Subsequently, a purposely made press machine was used to produce briquette at a pressure of 150 kg/cm2 followed by drying the product under the sun for three days. The briquette characterization employed several techniques including thermogravimetry analysis (TGA), differential scanning calorimetry (DSC), bomb calorimeter, and mechanical testing. The results showed that the calorific value of king grass increased from 3747 cal/g to 4346 cal/g after the torrefaction process at a temperature of 175˚C. The results of the proximate test showed that the fixed carbon content increased from 4.76% to 25.75% after the torrefaction process at a temperature of 175˚C. In terms of mechanical properties, it is known that the torrefaction process of king grass has significantly improved the friability, density and size stability. Overall, this study has succeeded in revealing the potential use of briquette products made from king grass as alternative fuel for co-firing at steam power plant
Studi perbandingan perilaku lelah AISI 316L dengan menggunakan metode eksperimen dan simulasi Fakhriza Fakhriza; Syifaul Huzni; Murtadhahadi Murtadhahadi; Abubakar Dabet
Jurnal POLIMESIN Vol 19, No 2 (2021): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v19i2.2302

Abstract

Fatigue failure occurring at a material in the dynamic loads is very dangerous because it is happen without initial guidance, fatigue testing to predict the life of use need to be done. This study focused on AISI 316L stainless steel which is used in industries because it’s mechanical properties, weldability, corrosion resistance and good machining. Fatigue testing are based on ASTM E466 and E468 standard in laboratory’s environmental by using fatigue testing machine rotary bending type. The results of fatigue testing present in   S-N curve, it showed that the endurance limit of stress 277 MPa at 2870667 cycles. For comparison, from the simulasi carried out, the stress is 258 MPa at 2870667 cycles. In terms fatigue life, the material is categorized in the high cycles and fracture pattern is low stress
Study Of The Effect Of Variations In Fiber Orientation On The Tensile Strength Properties Of Polyester Composites Reinforced Abaca Fiber Abubakar Dabet; Nurul Islami; Aljufri; Ferry Safriwardi; Azhar Syahputra; Muhammad Yusri
Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MICoMS) Vol. 4 (2024): Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MI
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/micoms.v4i.899

Abstract

A composite is a material formed from a combination of two or more constituent materials using a heterogeneous mixing process, whose mechanical properties vary. The aim of this research is to compare the tensile strength values ​​of abaca banana stem fiber polyester composites with variations in fiber orientation. The fiber orientation used is parallel, random and woven. The method used is a hand lay-up press with a fiber volume fraction of 30% and the resin itself uses BQTN 157 EX polyester resin with a hand lay-up method using a glass mold. The test was carried out by tensile testing using the ASTM D3039 measurement standard and macro photos. The results of research on tensile testing show that composites with variations in parallel fiber orientations reinforced with abaca banana stem fibers have an average tensile strength of 39.63 MPa, variations in random fiber orientation have an average tensile strength of 32.87 MPa and variations in fiber orientation woven has an average tensile strength of 25.90 MPa. From the results of macro photo fracture observations, it was found that the type of fracture is a brittle fracture on an uneven fracture surface which causes fiber pull-out where the fibers appear to be coming out of the specimen because the matrix and fibers are not strongly bonded and the fracture is also caused by voids near the fibers.
Co-Authors Adi Setiawan Aditya Kamanurandi Al Ikhlas Alchalil Alchalil ALJUFRI Aljufri Aljufri Antoni Antoni Ariyanto M Azhar Syahputra Fajriana Fakhriza Fakhriza Ferry Safriwardi Ferry Safriwardi Indra Indra Jumadi Jumadi Meriatna Meriatna Muhamad Syafii Muhammad Iqbal Muhammad Yusri Muhammad Yusuf Muhdar HM Murtadhahadi Murtadhahadi Nasrah, Sayni Nurul Islami, Nurul Rahmiati Ruwaida Rifanida Rifanida Shafira Riskina Siraj Syamsul Bahri Syifaul Huzni Taufiq Taufiq Teuku Mudi Hafli Yudistira Yudistira Zulfahmi Z Zulfahmi Zulfahmi Zulmiardi, Zulmiardi