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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Konversi Energi dan Manufaktur
Musfirah Cahya Fajrah
Institut Sains dan Teknologi Nasional
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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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.
Relationship of Physical Properties and Crystal Structure CaCO3 Purebred Chicken Egg Shells Musfirah Cahya Fajrah; Amirah Wardah; Bambang Soegijono
Jurnal Penelitian Pendidikan IPA Vol 11 No 11 (2025): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i11.12227

Abstract

Preliminary research has been carried out on purebred chicken egg shells with research linking the physical properties and crystal structure of CaCO3 of purebred chicken egg shells. The XRF results showed the atomic elements Si, P, Ca, Ti, Fe, Zn and Sr, with a Ca content of 95.603%. The use of 3%, 5% and 10% mixing variation methods, at heating temperatures of 900oC, 1000oC, 1100oC and 1200oC. The physical properties of dry shrinkage and water absorption decreased for each mixing variation and heating temperature, while the burn shrinkage values, density, and fracture strength increased for each mixing and heating temperature. The crystal structure formed did not change the mixing variation and heating temperature, namely the result of MATCH entry number 96-901-5692 of the hexagonal crystal system, the space group R-3C and the cell units a=b= 4.9771Ǻ and c = 17.3369Ǻ.
Co-Authors Amirah Wardah Bambang Soegijono M. Derajat Amperajaya Nofi Erni Roesfiansjah Rasjidin Septian Rahmat Adnan, Septian Taufiqur Rachman Ujang Juwardi