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All Journal Rekayasa Mesin Jurnal Konversi Energi dan Manufaktur
Septian Rahmat Adnan
Universitas Esa Unggul
Aerospace Engineering Automotive Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PERHITUNGAN KURVA HISTERESIS INTRINSIK MATERIAL ZINC OXIDE (ZnO) Septian Rahmat Adnan; Bambang Soegijono
Jurnal Konversi Energi dan Manufaktur Vol. 5 No. 1 (2018)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (358.518 KB) | DOI: 10.21009/JKEM.5.1.3

Abstract

Energi bebas Gibbs dan kurva polarisasi spontan dari Zinc Oxide (ZnO) dihitung menggunakan Teori Landau-Devonshire. Program komputasi untuk menghitung Energi bebas Gibbs dan kurva polarisasi spontan dibuat pada Delphi 6 . Dari hasil perhitungan menunjukan bahwa energi bebas Gibbs terendah terdapat pada ZnO doping Li 1%s yang menunjukan struktur kristal paling stabil.
PERHITUNGAN WAKTU BAKU DAN PENENTUAN PRODUKTIVITAS PADA PENGERJAAN PEMBERSIHAN KACA GEDUNG X Ujang Juwardi; Septian Rahmat Adnan; Taufiqur Rachman; M. Derajat Amperajaya; Nofi Erni; Roesfiansjah Rasjidin; Musfirah Cahya Fajrah
Jurnal Konversi Energi dan Manufaktur Vol. 8 No. 1 (2023)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.8.1.8

Abstract

XYZ is a company that provides building maintenance services; one of its services is glass cleaning services. In every work on building maintenance services projects in the form of cleaning the glass of PT. XYZ has not calculated the standard time of work, which affects 45% of the total work exceeding the deadline for the job given and the difficulty of estimating the productivity of the workers. In this study, the standard time and productivity were determined on the glass cleaning work of building X using the stopwatch time study method. The results of the calculations carried out using the stopwatch time study method obtained the optimal normal time at each stage of the work, namely in the preparation of work equipment for 58.55 minutes, on the removal of the gallows 112.82 minutes, on the installation of ropes of 20.41 minutes, on machine checking is 22.29 minutes, glass cleaning is 54.17 minutes, rope disassembly process is 57 minutes, and gondola storage is 55.33 minutes so that the optimal standard time is 380.56 minutes. Calculation results showed that performance rating measurement, excellent skill is B1 +0.11, a good effort is C1 +0.05, good condition is C +0.02, consistency is C +0.01 with a rating factor obtained in normal time is 65.569 minutes, and from the results of the calculation of worker productivity in the work of cleaning the glass of building X was obtained 0.12 units/hour.
TINJAUAN PENGEMBANGAN MATERIAL BERBASIS BARIUM TITANAT, KOMPOSIT PVDF/BATIO3 DAN BATIO3/HAP UNTUK APLIKASI ELECTROSTATIC DIELECTRIC ENERGY STORAGE CAPACITOR Septian Rahmat Adnan; Budhy Kurniawan; Bambang Soegijono
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1423

Abstract

Barium titanate (BaTiO3) is ceramic material that is widely used in various applications..Electrostatic dielectric energy storage capacitor is one of the application of Barium titanate (BaTiO3) material. Composite materials based on barium titanate (BaTiO3) such as Polyvinylidene fluoride (PVDF)/BaTiO3 and BaTiO3/HAp Hydroxyapatite have been developed to improve the electrical properties of the materials. Many  research have been reported  hat barium titanate in nano phase has a maximum dielectric constant 5000 with particle size range of 30-50 nm. The addition of BaTiO3 composition as a filler to PVDF/BaTiO3 composite caused increasing of dielectric constant compared to the dielectric constant properties of the PVDF. Similar results also found on BaTiO3/HAp composite.  From this review, it was also found that the composite of these three materials is a candidate for future material to improve the electrical properties of PVDF which have been applied to electrostatic dielectric energy storage capacitor applications.
Co-Authors Bambang Soegijono Budhy Kurniawan M. Derajat Amperajaya Musfirah Cahya Fajrah Nofi Erni Roesfiansjah Rasjidin Taufiqur Rachman Ujang Juwardi