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All Journal Jambura Physics Journal Jurnal Riset Fisika Indonesia Prosiding Seminar Nasional Manajemen dan Ekonomi
Jefri Akbar
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Astronomy Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Materials Science & Nanotechnology Physics

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PEMANFAATAN KARBON AKTIF DARI LIMBAH KULIT LADA SEBAGAI ADSORBEN LOGAM BERAT BESI PADA PENGOLAHAN TAMBANG TIMAH (KULONG) DI PROVINSI KEPULAUAN BANGKA BELITUNG Dewi Marina; Widodo Budi Kurniawan; Arya Bagaskara; Jefri Akbar
Jambura Physics Journal Vol 2, No 1 (2020): April 2020
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (723.473 KB) | DOI: 10.34312/jpj.v2i1.5639

Abstract

Sintesis karbon aktif yang berasal dari limbah kulit lada sebagai material pengolahan air pasca tambang timah (kulong) di Propinsi Kepulauan Bangka Belitung telah dilakukan. Karbon aktif dipreparasi secara kimia menggunakan aktivator KOH 3M dengan nisbah 1:4 dan dikuti dengan aktivasi secara fisika dengan aliran gas N2 pada suhu 600 0C selama 3 jam. Sampel karbon aktif hasil preparasi dan telah mengalami pencucian hingga pH netral selanjutnya dikarakterisasi menggunakan SEM-EDX untuk mengetahui struktur morfologinya. Kemudian sampel karbon aktif dilakukan pengujian pada air kulong dengan parameter tingkat kekeruhan dan Atomic Absorbsion Spectrophotometry (AAS). Hasil SEM-EDX menunjukkan bahwa morfologi sampel berpori, selain itu hasil uji tingkat kekeruhan dengan perlakukan penambahan karbon aktif mengalami penurunan. Hasil serupa juga terjadi pada pengujian menggunakan uji AAS. Berdasarkan hasil pengujian dapat disimpulkan bahwa karbon aktif limbah kulit lada dapat dijadikan sebagai material penyerap pada proses pengolahan air pasca tambang timah (kulong).
Pengukuran Koefisien Serapan Bunyi Spons dan Styrofoam dengan Menggunakan Smartphone Sandi Sandi; Kumalasari Kumalasari; Jefri Akbar; Rospita Sari; Fitri Afriani
Jurnal Riset Fisika Indonesia Vol 1 No 1 (2020): Desember 2020
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (312.884 KB) | DOI: 10.33019/jrfi.v1i1.2011

Abstract

In this study, we analyzed the characteristics of samples sound absorption coefficient from sponge and styrofoam using a smartphone. The sound absorption coefficient is measured using a sound level meter and a frequency generator installed on a smartphone to determine the sound absorption coefficient. Samples were formed in circles with different thickness variations ranging from 1.5 cm to 15 cm. Through the tests that have been done, it can be seen that styrofoam has a higher sound absorption coefficient value than sponges. This research provides an alternative solution for measuring the sound absorption coefficient based on a smartphone device so that it is easy to apply, primarily to support the learning process related to sound material.
Pengaruh Penambahan Karbon Aktif Dari Kulit Lada dan Suhu Aktivasi Karbon terhadap Nilai Konduktivitas Anoda Berbasis LTO Jefri Akbar; Widodo Budi Kurniawan; Yekti Widyaningrum; Anisa Indriawati
Jurnal Riset Fisika Indonesia Vol 4 No 1 (2023): Desember 2023
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v4i1.3823

Abstract

PENERAPAN MANAJEMEN KINERJA DALAM SUMBER DAYA MANUSIA PADA UMKM CAFE UNCLE JACK Tara Chairunnisya; Tri Ayu Cahyani Putri; Hery Setiawan; Jefri Akbar
Prosiding Seminar Nasional Manajemen dan Ekonomi Vol. 1 No. 1 (2022): Juni : Prosiding Seminar Nasional Manajemen dan Ekonomi
Publisher : Universitas Kristen Indonesia Toraja

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (96.935 KB) | DOI: 10.59024/semnas.v1i1.5

Abstract

Performance Management is a procedure related to how to guide and develop the quality of employees at work. Where, the work of employees becomes a benchmark for the company’s budgeting system. By optimizing performance, good performance management is needed to realize the company’s goals. The research subject is Cafe Uncle Jack, has been operating for 5 years (2017) as a culinary business and consists of Mrs. Lina as Leader, Mrs. Lini as Manager, Barista, Cashier, Waitress, and Cooker. The purpose of this study is to evaluate the management of human resources at Cafe Uncle Jack including several series of activities provided by the new employment. In a series of activities that occur in Uncle Jack’s Cafe, a qualitative descriptive method will be formulated in the form of interviews related to performance management. Based on the results of the interview, Cafe Uncle Jack gives full attention ti it’s employees so that the quality of performance and customer satisfaction can be guaranteed.
Co-Authors Anisa Indriawati Arya Bagaskara Dewi Marina Fitri Afriani Hery Setiawan Kumalasari Kumalasari Rospita Sari Sandi Sandi Tara Chairunnisya Tri Ayu Cahyani Putri Widodo Budi Kurniawan Yekti Widyaningrum