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All Journal Jurnal Neutrino : jurnal fisika dan aplikasinya Jurnal Rekayasa Mesin MEDIA BINA ILMIAH Journal of Mathematics Education and Science
Pelangi Eka Yuwita
Universitas Nahdlatul Ulama Sunan Giri
Arts Humanities Education Mathematics Mechanical Engineering Physics Social Sciences

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STUDI PENGARUH GAS FLOW RATE TERHADAP KEKUATAN TARIK, KEKERASAN DAN CACAT PADA PENGELASAN MAG BAJA ASTM A 53 Aditya, Ziedan; Hidayat, Togik; Yuwita, Pelangi Eka
MEDIA BINA ILMIAH Vol 16, No 5: Desember 2021
Publisher : BINA PATRIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33758/mbi.v16i5.1584

Abstract

The selection of the type of welding is determined based on the type of steel, the tensile strength which is influenced by the carbon content, and the shielding gas used to minimize the occurrence of welding defects. The effect of large/small gas flowrate on Metal Active Gas (MAG) welding has an effect on the quality of welding results and welding defects. This study aims to determine the effect of gas flow rate MAG welding on tensile strength, hardness and welding defects in ASTM A53 steel. This research is a laboratory experimental study of variations in gas flow rate of MAG welding and then tested for tensile strength with a tensile tester, testing for hardness with a Rockwell harness test, testing for welding defects using a liquid penetrant test. Welding tensile strength based on the average value of the highest modulus of elasticity (E) is the specimen with MAG welding treatment with a gas flow rate variation of 25 liters/minute, which is 22.04 N/. The hardness value of the weld metal shows the highest average HRB value in MAG welding with a gas flow rate variation of 25 liters/minute which has an average value of 86.06 HRB. The metal hardness value in the Heat Affected Zone shows the highest average HRB value in MAG welding with a gas flow rate variation of 25 liters/minute which has an average value of 84.65 HRB, the hardness value in the base metal area shows the highest average value in MAG welding with a gas flow rate variation of 25 liters/minute which has an average value -average 82.92 HRB. The results of the welding defect test show that for all variations of the types of welding defects that arise are porosity, undercut, lack of penetration and spatter
Aplikasi Komputasi Bayesian Regresi Dummy Pada Kasus Kanker Serviks di Kabupaten Tuban Nur Mahmudah; Pelangi Eka Yuwita
Journal of Mathematics Education and Science Vol. 5 No. 2 (2022): Journal of Mathematics Education and Science
Publisher : Universitas Nahdlatul Ulama Sunan Giri Bojonegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (253.561 KB) | DOI: 10.32665/james.v5i2.415

Abstract

Kanker serviks adalah kanker yang paling banyak diderita oleh wanita yang menjadi penyebab kematian. Penyebab utama kanker serviks adalah infeksi Human Papilloma Virus (HPV). Kanker serviks merupakan penyakit yang disebabkan oleh pertumbuhan sel- sel jaringan tubuh yang tidak normal di dalam leher rahim/ serviks yang terdapat dalam organ bagian reproduksi pada tubuh wanita dan menyebabkan kematian. Untuk mencegah munculnya fase ganas dibutuhkan program screening pada lama rawat inap pasien kanker serviks. Penelitian ini bertujuan untuk mengetahui faktor-faktor yang mempengaruhi lama rawat inap pasien kanker serviks di Kabupaten Tuban dengan metode komputasi Bayesian Regresi Dummy. Metode Bayesian adalah salah satu teknik komputasi pada estimasi parameter yang menggabungkan fungsi likelihood dan distribusi prior menjadi distribusi posterior dalam menduga parameter model. Bayesian regresi dummy menghasilkan suatu variabel yang memiliki pengaruh signifikan terhadap lama rawat inap pasien kanker serviks, yaitu variabel Komplikasi (X1). Dengan nilai alpha 2.17, menunjukan bahwa terdapat dependensi/error yang tidak bisa dijelaskan dalam model regresi dummy pada kasus lama rawat inap kanker serviks di Kabupaten Tuban.
CHARACTERIZATION OF CARBON NANOCRISTRAL STRUCTURE BASED ON CORN COB CHARCOAL Pelangi Eka Yuwita; Roihatur Rohmah
Jurnal Neutrino:Jurnal Fisika dan Aplikasinya Vol 15, No 1 (2022): October
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/neu.v15i1.17067

Abstract

Carbon has an amorphous structure and a crystalline structure. The amorphous structure of carbon is usually found in charcoal, while the crystalline structure of carbon can be obtained from heat treatment. In the present study, the synthesis of carbon nanocrystals based on corn cob charcoal was successfully carried out. The synthesis began with the carbonization process of corn cobs to produce charcoal. Corn cob charcoal powder was then put into 80 mL of HCl solution and stirred using a magnetic stirrer by a speed of 750 rpm at room temperature and 80 mL of NH4OH solution was titrated into it. After the synthesis, the carbon powder was calcined at 400°C and activated using PEG 2000 template. The samples were tested using XRD (X-ray Diffraction) and SEM-EDX (Scanning Electron Microscope-Energy Dispersive X-ray). The carbon component (C) from the EDX test after the synthesis and carbonization process had an atomic percentage of 56.89% and increased by 81.06 % after PEG 2000 activation. The results of the X-ray diffraction pattern show that in all samples a broad and weak diffraction pattern was the characteristic of amorphous carbon. However, on carbon heated for 5 hours at 400°C and the addition of PEG 2000 activator, the crystal structure pattern with higher diffraction peaks was obtained and the peaks of diffraction were matched with CIF data 9008569 from phase C Graphite which had a space group P of 63 mc. SEM data on the morphology of the material showed that after receiving PEG activator, the carbon particles were split into smaller ones so that it increased in surface area and showed fairly even distribution of pores which was also seen in the surface morphology of the carbon
Studi Pengaruh Variasi Media Pendingin Quenching dan Waktu Penahanan pada Proses Heat Treatment terhadap Kekerasan Baja AISI 1045 Pelangi Eka Yuwita; Ahsanul Habib; Rizka Nur Faila
Jurnal Rekayasa Mesin Vol 19, No 1 (2024): Volume 19, Nomor 1, April 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i1.4960

Abstract

Baja merupakan logam yang banyak digunakan sebagai bahan industry mesin, salah satunya yaitu baja AISI 1045. Baja AISI 1045 memiliki kandungan karbon sebesar 0,45% dan tergolong dalam jenis baja medium. Penerapan baja tersebut yaitu sebagai bahan dasar connecting rod, roda gigi, bearing serta poros, yang mana dalam pengopreasiannya mendapatkan gesekan serta tekanan yang menyebabkan keausan. Oleh karena itu, untuk menambah umur penggunaannya perlu dilakukan proses heat treatment sebagai upaya meningkatkan sifat mekanik dari baja. Dalam penelitian ini dilakukan proses heat treatment pada temperature 920℃ dengan variasi media pendingin (udara, oli SAE 15-50, air garam) dan variasi holding time (20 menit, 30 menit, 40 menit). Selanjutnya di lakukakan pengujian kekerasan menggunakan rockwell hardness test (HRB) untuk menyatakan nilai kekerasan. Hasil pengujian selanjutnya dibandingkan untuk mendapatkan nilai kekerasan yang optimal. Hasil rata – rata kekerasan raw material yaitu sebesar 88,2 HRB. Selanjutnya nilai rara-rata kekerasan paling tinggi di dapatkan pada waktu penahanan 40 menit dengan media pendingin quenching ari garam sebesar 110,32 HRB dimana terjadi kenaikan dari raw material sebesar 25%. Sedangkan nilai kekerasan rata-rata paling rendah didapatkan pada waktu penahanan 20 menit dengan media quenching udara sebasar 88,9 HRB.
Co-Authors Aditya, Ziedan Ahsanul Habib Nur Mahmudah Rizka Nur Faila Roihatur Rohmah Togik Hidayat