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All Journal Rekayasa Mesin SOLUSI Jurnal Fokus Manajemen JURNAL MANAJEMEN MODAL INSANI DAN BISNIS (JMMIB) Jurnal Entrepreneur dan Manajemen Sains International Journal of Innovation in Mechanical Engineering and Advanced Materials Jurnal Pengabdian Kolaborasi dan Inovasi IPTEKS Jurnal Pendidikan dan Pengabdian Masyarakat Proceedings of The International Conference on Multidisciplinary Science PESHUM
Subandrio, Subandrio
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Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Kinerja Pegawai: Kecerdasan Emosional dan Sikap Kerja Subandrio, Subandrio; AP, M Galy Njoman; Bahrun, Khairul
Solusi Vol. 22 No. 4 (2024): October
Publisher : Fakultas Ekonomi, Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/slsi.v22i4.10797

Abstract

The quality and competence of human resources are key aspects that influence organizational success and a company's ability to design strategies to compete in an increasingly competitive market. The purpose of this study is to determine whether emotional intelligence and work attitude affect employee performance at the Secretariat of the Regional House of Representatives (DPRD) of Seluma Regency. This study is categorized as quantitative research, with a population encompassing all employees at the Secretariat of DPRD Seluma Regency, totaling 50 employees. A sample of 48 individuals was used, selected through a saturated sampling approach. Two independent variables (X) were used: emotional intelligence and work attitude, while the dependent variable (Y) was employee performance. The data was collected as primary data through directly distributed questionnaires. The data analysis technique employed was multiple linear regression, processed using SPSS version 26, which included validity testing, reliability testing, classical assumption testing, and hypothesis testing. The research results indicate that emotional intelligence has a positive and significant effect on employee performance, meaning that the better employees manage their emotional intelligence, the higher their performance. Additionally, work attitude also has a positive and significant impact on performance, showing that an increase in emotional intelligence and work attitude among employees will enhance their performance.
Optimization of Titanium Recovery from Tin Tailings Using Flotation Route Subandrio, Subandrio; Dahani, Wiwik; Sundari, Rita; Kurniawati, Riskaviana; Marwanza, Irfan; Darren, Franko Sajow
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 6, No 3 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v6i3.28891

Abstract

Titanium has found widespread application across various industries due to its high corrosion resistance. It is commonly used in dental equipment, surgical instruments, bone implants, and marine components, and serves as an engine material in high-temperature environments. Because of its lighter weight compared to steel, titanium has also replaced stainless steel in many construction materials. In Bangka Island, Indonesia, tin tailings have been identified as a potential source of titanium, making the analysis of titanium in these tailings highly significant. This study employed the froth flotation method, known for its simplicity, speed, and cost-effectiveness, to analyze titanium content from tin tailings. Sodium oleate was used as the frother and collector, while sodium chlorate acted as the depressant. The mass ratios of depressant to collector were varied at fixed collector amounts (1:10, 5:10, 10:10, and 15:10) and fixed depressant amounts (10:3, 10:6, 10:9, and 10:12). The highest titanium concentration (2.03%) was achieved with a mass ratio of 10:12, while the optimal titanium recovery (45.51%) in the concentrate occurred with equal amounts (3.75 g) of depressant and collector, or at a mass ratio of 10:10, at 15 minutes of flotation time and neutral pH. X-ray fluorescence (XRF) and X-ray diffraction (XRD) analyses indicated that the tin tailings primarily contained silicate and zircon minerals, with traces of titanium in the form of rutile, ilmenite, and titanate. These findings contribute valuable insights for future titanium extraction and processing industries.
EFFECT OF ACID CONCENTRATION AND ROTATION RATE ON PB LEACHING FROM GALENA ORES Sundari, Rita; Dahani, Wiwik; Marwanza , Irfan; Subandrio, Subandrio; Herdiyanto, Rizky B.
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1583

Abstract

This research is related to lead (Pb) leaching from galena ores using acid leaching method. The galena ores have been treated through pyrometallurgy method by roasting at 600oC 1h to yield galena concentrate. The Pb concentration has been determined by AAS (Atomic Absorption Spectrophotometry) using acid leaching method. This study has observed the effect of leaching acid concentration (acetic and sulfuric acids) and rotation rate on Pb leaching at 50oC 45 min. This study shows that varied acetic acid concentrations gave more effect on Pb extraction. Optimum condition achieved for 2.0 M acetic acid for all given rotation speeds (200 rpm, 300 rpm, and 400 rpm). For sulfuric acid leaching, optimum condition achieved at 1.0 M H2SO4 at 400 rpm. From the results, it is apparent that varied rotation speed (200 rpm, 300 rpm, 400 rpm) gave lesser effect on Pb leaching rather than varied acid concentration effect (0.5 M, 0.75 M, 1.0 M, 2.0 M, and 3.0 M).  In addition, the XRF (X-Ray Fluorescence) analysis on galena ores shows the existence of lanthanum, ytterbium, and europium (rare earth elements) in significant amount since rare earth elements displays important role in modern industry for nuclear battery, dental apparatus, microchips, hybrid vehicles, catalyst for cracking, audio device, and ceramic agent. Statistical and numerical analysis are briefly included in this study to determine the dominant factor and process optimization.
Pembelajaran Mahaarah Istimaa’ Menggunakan Media Youtube di Sekolah Tinggi Bekasi Luthfi Zahara; Hotimin, Hotimin; Subandrio, Subandrio
PESHUM : Jurnal Pendidikan, Sosial dan Humaniora Vol. 5 No. 1: Desember 2025
Publisher : CV. Ulil Albab Corp

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/peshum.v5i1.12353

Abstract

Pembelajaran mahaarah isitimaa’ merupakan salah satu kompenen penting dalam penguasaan bahasa Arab. Penelitian ini bertujuan untuk mengetahui proses pembelajaran mahaarah isitmaa’ menggunakan media YouTube, kendala yang dihadapi mahasiswa Sekolah Tinggi Bekasi dalam pembelajaran mahaarah istimaa’ melalui media YouTube, dan respons mahasiswa terhadap pembelajaran mahaarah istimaa’ memggunakan media YouTube. penelitian ini merupakan penelitian kualitatif dengan menggunakan metode naratif dan teknik pengumpulan data melalui observasi, wawancara, dan dokumentasi. Analisis data dilakukan dengan menggunakan metode Braun & Clarke yang terdiri dari memahami data, meng-coding, dan mendeskripsikan data. Hasil penelitian ini menunjukkan bahwa proses pembelajaran mahaarah istimaa’ melalui media YouTube cukup efektif. Dosen memanfaatkan video dari Youtube untuk meningkatkan kemampuan menyimak mahasiswa dengan mendengarkan percakapan bahasa Arab langsung dari penutur asli dan menggunakan metode project-based learning dapat meningkatkan keterlibatan dan motivasi mahasiswa. Terdapat beberapa kendala yang dihadapi mahsiswa dalam pembelajaran mahaarah istimaa’ menggunakan media YouTube, seperti perbedaan kemampuan menyimak antara mahasiswa, sarana yang kurang memadai, dan dialek yang beragam dalam video yang digunakan. Dalam pembelajaran mahaarah istimaa’ menggunakan media YouTube mahasiswa memberikan respons yang bermacam-macam; Sebagian besar berusaha aktif dan berpartisipasi dalam diskusi di kelas.
Co-Authors Amarta, Elsa Ambystisela, Agdtia AP, M Galy Njoman Azizi, Masagus Ahmad Bahrun, Khairul Bani Nugroho, Bani Darren, Franko Sajow Febriani, Elsyah Fernandes, Feggy Firnanda, Friska Fera gustian, Gustian Arjes Hendri, Oon Hendri Herdiyanto, Rizky B. Hotimin, Hotimin Irfan Marwanza Kurniawati, Riskaviana kusmiarti, reni Luthfi Zahara Marwanza , Irfan Mukadar, Amir Patian, Syamidi Paulina, Yanti Pebodera , Teza Putri, Dwi Adesi R, Sari Apriliana Raden Rudi Alhempi Rahmanto , Bambang Reviono Reviono Setiawan , Dharma Soetejo, FX Sundari, Rita Wahyu Purwanto Wahyuni, Intan Tri wiwik dahani, wiwik Yusup Subagio Sutanto