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Water absorption of polyester resin polymer composite reinforced woven agel fiber (Corypha gebanga) in various solution Hendri Hestiawan; Jamasri Jamasri; Kusmono Kusmono
Jurnal Teknik Mesin Indonesia Vol 15 No 1 (2020): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v15i1.147

Abstract

Kajian ini bertujuan untuk mengetahui penyerapan air pada komposit resin poliester berpenguat serat agel tenun (Corypha gebanga) yang direndam dalam air distilasi dan larutan 3,5% NaCl. Bahan yang digunakan adalah serat agel tenun, resin poliester tak jenuh Yukalac 157 BQTN, dan katalis metil etil keton peroksida (MEKP). Teknik pembuatannya menggunakan vacuum bagging dengan tekanan hisap 70 cmHg pada suhu ruangan. Spesimen uji penyerapan air berdasarkan standar ASTM D570 selama 1080 jam pada suhu kamar. Hasil uji penyerapan air menunjukkan bahwa komposit resin poliester berpenguat serat agel tenun yang direndam dalam air distilasi memiliki kemampuan menyerap air dan koefisien difusi yang lebih tinggi daripada yang direndam dalam larutan 3,5% NaCl. Hal ini menunjukkan bahwa tingkat viskositas larutan mempengaruhi penyerapan air dan difusi.
Edukasi Pemakaian Masker dan Face shield dalam Mencegah Penyebaran Covid-19 Kepada Pedagang Pasar Panorama Kota Bengkulu Hendri Hestiawan; Agus Nuramal; A. Sofwan F. Alqap; Yossie Anggraeny M
Prosiding Seminar Nasional Unimus Vol 3 (2020): Optimalisasi Hasil Penelitian dan Pengabdian Masyarakat Menuju Kemandirian di Tengah P
Publisher : Universitas Muhammadiyah Semarang

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Abstract

Covid-19 has infected millions of people around the world, including Indonesia. Market traders who interact with many people are very vulnerable to Covid-19 transmission. This activity aims to provide education and assistance to the traders at Panorama Market of Bengkulu City to comply with the health protocols set by the government, such aswearing masks and face shields, especially for outdoor activities. This activity was also followed by the distribution of masks and face shields to traders at Panorama Market so that they could be used in their daily trading activities. The educational method used participatory action research using lectures, discussions, questions and answers, demonstrations, posters and banners. This educational activity is a collaboration between the Engineering Faculty of Universitas Bengkulu, Community Health Center Jembatan Kecil and Sahabat Psikologi of Bengkulu City. Educational materials include the introduction of Covid-19 and health protocols in the form of wearing masks and face shields. The evaluation of the activity used a questionnaire sheet to find out the participants knowledge before and after being given education. The results of the activity showed that the education provided by the facilitator canincrease the knowledge of market traders about Covid-19 and health protocols in the form of wearing masks and face shields in an effort to prevent the spread of Covid-19. Participants knowledge of Covid-19 increased from 50% to 85%, while the importance of wearing masks and face shields increased from 60% to 90% after being given education.Keywords: Covid-19, Face shield, Health protocol, Market trader, Mask
ANALISA KOROSI PADA TANGKI REAKTOR TRIGA 2000 MENGGUNAKAN METODE INSPEKSI ULTRASONIK DAN INSPEKSI VISUAL (UNDERWATER CAMERA) Shafira; Hendri Hestiawan; Bismantolo, Putra
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25457

Abstract

A reactor is a process device where a reaction takes place, be it a chemical or nuclear reaction and not physically. Nuclear reactors are used for various purposes, namely to create, regulate, and maintain a nuclear chain reaction at a constant rate. One method of monitoring corrosion is using an ultrasonic device to measure the thickness of the tank wall and an underwater camera tool to visually see the damage that has occurred and will provide a quantitative estimate of the corrosion rate that occurs in the system by comparing the initial weight and weight after a certain time. The corrosion rate value on the TRIGA 2000 reactor wall is obtained through the weight reduction method, and has an average corrosion value of 0.10 mmpy, while the type of corrosion that occurs on the TRIGA 2000 reactor wall is the type of intergranular corrosion. protective coating by coating organic compounds (lubricant) and controlling humidity and temperature.
PENGARUH VARIASI ARUS LISTRIK TERHADAP NILAI KEKERASAN HASIL LASAN BAJA ASTM A36 M. Harun Humaidi; Ahmad Fauzan Suryono; Hendri Hestiawan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25451

Abstract

Metal inert gas (MIG) welding is widely used whenever high and medium speed melting or joining of metals is required, MIG welding uses a DC current which is ignited between the worked part and the electrode wire, where this electrode functions simultaneously as a power carrier and source. metal filler, for MIG welding the gas is inert argon gas or a mixture of argon helium. In this study, the variables to be compared are the effect of variations in electric current and hardness values ​​on MIG welding using CO2 gas. The purpose of this study was to analyze the effect of variations in electric current on the welding results, and to analyze the mechanical properties of the welding hardness value. The material used in this study as the workpiece is ASTM A36 steel with 6 pieces of length, width, and thickness dimensions of each 147 mm x 50 mm x 5 mm. The welding process is carried out by placing two workpieces parallel to the seam facing each other and a distance of 1 mm, with a current of 60 A, 100 A, and 150 A before full welding is carried out welding at the end of the workpiece so that there is no shift, then welding is carried out. full. The data collection method was carried out using the Hardness Tester hardness tester with the Brinell method at 5 test points in the weld area, the HAZ area, and the base metal area. The results showed that the welding results at a current of 60 A obtained uneven wavy, there were ridges at a current of 100 A the welding results were not too wavy, the ridges produced were slightly at a current of 150 A, the welding results were not neat in the middle of the weld area and there are pores. From the visual results of welding, the best welding results are at 100 A, the electric current used in Metal Inert Gas welding affects the weld results, the use of electric current that is close to the ASTM A36 steel welding standard (110 A – 130 A) will get better results. The best hardness value of this welding is at a current of 100 A, with almost the same average values, namely 96.52 HRB, 95.92 HRB, and 96.44 HRB.
SIMULASI ANALISIS VELOCITY ALIRAN FLUIDA PADA TANGKI REAKTOR NUKLIR MENGGUNAKAN METODE COMPUTATIONAL FLUID DYNAMICS (CFD) Mifta Aroyyani; Agus Nuramal; Hendri Hestiawan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25461

Abstract

Center for Applied Nuclear Science and Technology (Pusat Sains dan Teknologi Nuklir Terapan /PSTNT) is a work unit that is under and directly responsible to the Deputy for Nuclear Science and Applications of Nuclear Technology, National Nuclear Energy Agency. In PSTNT Bandung, the function of the tank is as a container to place the reactor components, the reactor shield for the heat exchanger and as a place for nuclear reactions to take place. In nuclear reactor tank flow distribution ocures in various velocity.The purpose of this practical work is to analyze the velocity of fluid flow in the reactor tank from the inlet flow to the bottom surface of the reactor and from the bottom surface to the top surface of the TRIGA 2000 reactor. The method used in this practical work is the Computational Fluid Dynamics (CFD) Velocity method. CFD is a method for simulating fluid flow. The method is processed numerically and then digitally modeled. In practice, the authors modeled and studied the conceptual design of the reactor system using CFD based on Gambit and Fluent applications in a reactor tank. GAMBIT is an application produced by fluent inc. which is useful for making a model and discrete (meshing) to be analyzed by numerical methods. Fluent is an application that can solve fluid flow cases with the results obtained after discretizing the GAMBIT application. The results by CFD shows the distribution of fluid flow from the inlet pipe to the bottom surface of the reactor tank then the flow rises to the top surface to the outlet pipe. The velocity of the fluid flow from the inlet flow to the bottom surface was getting smaller, and the smallest value was at the bottom of the nuclear reactor, by 0.164 m/s and the flow distribution from the bottom surface to the top surface of the velocity value in a nuclear reactor would be bigger by the largest value being on the top surface of the nuclear reactor is 2.9 m/s.
Socialization of New and Renewable Energy for Community of Sawah Lebar Baru Sub-District, Ratu Agung District, Bengkulu City: Sosialisasi Sumber Energi Baru dan Terbarukan untuk Masyarakat Kelurahan Sawah Lebar Baru, Kecamatan Ratu Agung, Kota Bengkulu Angky Puspawan; Afdhal Kuniawan Mainil; Helmizar; Fepy Supriani; Hardiansyah; Hendri Hestiawan; Khairul Amri; Makmun Reza Razali; Nurul Iman Supardi
Dharmakayana Vol 2 No 1 (2025): Mei : Dharmakayana: Journal of scientists, engineers, educators and scientific ac
Publisher : Program Studi Teknik Mesin, Fakultas Teknik Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dk.v2i1.41616

Abstract

Pertumbuhan ekonomi dan kemajuan teknologi akan menyebabkan tingginya penggunaan energi. Sebagian besar energi di dunia menggunakan sumber energi berbasis fosil, dimana penggunaannya menghasilkan emisi gas rumah kaca yang berdampak buruk pada lingkungan, seperti pemanasan global dan dampak negatif terhadap kesehatan manusia. Karenanya beberapa negara maju dan berkembang melakukan aksi dalam pembatasan penggunaan energi fosil dan mendorong pemanfaatan energi baru dan terbarukan yang lebih ramah lingkungan dan lebih berkelnajutan (sustainable). Diantara aksi tersebut adalah Paris Agreement pada tahun 2015 yang mendorong setiap negara melakukan kegiatan untuk menurunkan iklim global setidaknya 1,5°C – 2°C. Energi baru dan terbarukan adalah sumber daya energi alami yang dapat digunakan secara bebas, terus diperbaharui, tak terbatas, dan terus berkelanjutan. Hal-hal terpenting adalah terkait jenis, sumber, dan manfaat dari energi baru dan terbarukan. Kebutuhan manusia akan sumber daya energi tidak dapat diabaikan, karena setiap aktivitas memerlukan sumber daya, baik itu terbarukan maupun tidak. Namun, penggunaan sumber daya energi yang tidak dapat diperbaharui berlebihan telah menyebabkan kerusakan lingkungan alam yang serius dan akhirnya menghasilkan polusi yang berbahaya bagi Kesehatan manusia dan lingkungan. Dalam menghadapi keterbatasan sumber daya energi yang tak terbarukan, para ilmuwan dari berbagai negara telah mulai mengembangkan sumber daya energi baru dan terbarukan. Kegiatan pengabdian ini tidak hanya bertujuan untuk memperkenalkan konsep energi baru dan terbarukan, tetapi juga memberikan solusi konkret terhadap masalah sampah yang telah menjadi ancaman serius bagi lingkungan dan kesehatan masyarakat. Masalah sampah, khususnya limbah anorganik, telah menjadi salah satu isu utama yang dihadapi masyarakat modern. Setiap hari, tumpukan sampah kian menggunung, menciptakan dampak negatif yang signifikan, terutama ketika musim hujan tiba. Krisis ini tidak hanya berdampak pada keindahan lingkungan, tetapi juga berpotensi menyebabkan banjir yang melanda daerah pemukiman. Sampah anorganik, seperti plastik, tidak dapat terurai secara alami, sehingga memerlukan intervensi yang inovatif dan berkelanjutan. Sebagai respons terhadap tantangan tersebut, tim pengabdi mengembangkan teknologi mesin pencacah sampah anorganik yang revolusioner. Teknologi ini mampu mengubah limbah plastik menjadi serbuk atau biji plastik, sehingga memfasilitasi proses daur ulang yang lebih efisien. Dengan inovasi ini, kita tidak hanya mengurangi volume sampah, tetapi juga memberikan nilai tambah pada limbah yang selama ini dianggap sebagai masalah. Proses distilasi merupakan salah satu cara atau solusi untuk menghasilkan minyak hasil proses distilasi dengan metode pirolisis untuk bahan bakar cair dan ini menjadi salah satu sumber energi alternatif. Energi alternatif ini diperoleh dari sampah berbagai macam atau tipenya. Karena bahan bakunya berlimpah maka selain menjadi bahan bakar alternatif juga mampu menyelesaikan masalah sampah anorganik yang nyata tidak dapat diperbaharui dan dapat merusak tanah dan lingkungan.
Pelatihan Pembuatan Arang Tempurung Kelapa Menggunakan Retort di Sawah Lebar Baru, Kota Bengkulu Hendri Hestiawan; Nurul Iman Supardi; Angky Puspawan
Dharmakayana Vol 1 No 2 (2024): November : Dharmakayana: Journal of scientists, engineers, educators and scientif
Publisher : Program Studi Teknik Mesin, Fakultas Teknik Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dk.v1i2.38913

Abstract

Coconut shell waste has not been utilized into useful ones. Its condition is a potential problem for the environment. Coconut shells can be made into charcoal using a retort. Training on making charcoal from coconut shells in a retort furnace was given to community groups in Sawah Lebar Baru, Bengkulu City. The activity includes several stages: observation, preparation, implementation and evaluation of the activities carried out. The implementation involved lecturers and students from the Mechanical Engineering Study Program, Faculty of Engineering, University of Bengkulu. Participants from the community were quite helped by the presence of students so that they were very enthusiastic and played an active role during the activity. At the evaluation stage, an assessment was given to participants in two stages, pre-test and post-test. The assessment results showed that the activity was able to increase participants' understanding of the material from 52% to 80%.