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All Journal Jurnal Online Mahasiswa (JOM) Bidang Ilmu Ekonomi Jurnal Daur Lingkungan Enrichment : Journal of Management Environmental Pollution Journal
Marhadi Marhadi
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Humanities Chemistry Control & Systems Engineering Economics, Econometrics & Finance Engineering Environmental Science Law, Crime, Criminology & Criminal Justice

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ANALISIS UJI BEDA PELATIHAN, PENGALAMAN KERJA DAN TINGKAT PENDIDIKAN TERHADAP PRODUKTIVITAS KERJA KARYAWAN PADA PT.POS INDONESIA CABANG KOTA DUMAI Zulaika Siti; ningsih Suryati Dewita; Marhadi Marhadi
Jurnal Online Mahasiswa (JOM) Bidang Ilmu Ekonomi Vol 9, No 2 (2022): (Juli - Desember)
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Ilmu Ekonomi

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Abstract

PT. Pos Indonesia Dumai City Branch provides mail and package deliveryservices as well as financial services such as electricity payments, tax payments,motor vehicle loan installment payments, sending and receiving money fromwithin and outside the country, payment of passport manufacturing fees andpurchase of stamps and stamps. The increasing competition of companies in thesame field in Dumai City such as JNE, J&T, TIKI delivery services and financialservices such as financial transaction agents from banks has a big impact on PT.Pos Indonesia Dumai City Branch. This study aims to determine the differences intraining, differences in work experience and differences in education levels to thework productivity of employees at PT. Pos Indonesia Dumai City Branch. Thepopulation of this study was employees of PT. Pos Indonesia Dumai City Branchwith a total of 68 respondents. The data analysis technique used is descriptiveanalysis. Data collection techniques use primary data and secondary data. Thedata analysis used is a validity test, reliability test, normality test and T test(Paired Sample t-Test). The results showed that there were differences in training,differences in work experience and differences in the level of education to thework productivity of employees at PT. Pos Indonesia Dumai City Branch. Keywords : Training, Work Experience, Education Level and Work Productivity
Aplikasi Model QUAL2Kw dalam Penilaian Kualitas Air Sungai Kambang Parameter BOD dan NH3-N Nuzul Hafiizha Asyari; Siti Umi Kalsum; Marhadi Marhadi
Jurnal Daur Lingkungan Vol 9, No 1 (2026): February
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/daurling.v9i1.497

Abstract

The Kambang River is a river in Jambi City that passes through densely populated residential areas and shopping centers, making it vulnerable to pollution from both point and non-point sources. This study aims to model the water quality of the Kambang River using QUAL2Kw software on the Biochemical Oxygen Demand (BOD) and Ammonia as nitrogen (NH3-N) parameters in response to increasing discharge and pollutant levels from point sources. Sampling was conducted using grab sampling at nine points representing the upstream, midstream, and downstream segments. The test results were compared with the river water quality standards and similar waters, Class II, Appendix VI of Government Regulation No. 22 of 2021 concerning the Implementation of Environmental Protection and Management. River hydraulic data (discharge, width, depth, flow velocity, and riverbed slope) were used as input data in the QUAL2Kw worksheet. Data calibration was performed using trial and error, then data validation using the Root Mean Square Percentage Error (RMSPE) method. The results of water quality testing showed that the BOD and NH3-N parameters at all sampling points did not meet the established quality standards. The BOD test value ranged from 7.10 to 16.20 mg/L with a quality standard of 3.00 mg/L, and the NH3-N test results ranged from 3.03 to 14.13 mg/L with a quality standard of 0.20 mg/L. The model validation results using the RSMPE method for discharge parameters were 3.21%, BOD 3.88%, and NH3-N 0.46%, meeting the criteria of
Penilaian Polymer Hazard Index Mikroplastik Pada Sedimen Sungai Batanghari Indah Nur Aini; Marhadi Marhadi; siti umi kalsum
Environmental Pollution Journal Vol. 6 No. 1: April 2026
Publisher : ECOTON: Ecological Observation and Wetlands Conservation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58954/epj.v6i1.353

Abstract

Mikroplastik dapat ditemukan pada sedimen sungai disebabkan oleh arus air yang mengangkut mikroplastik dari sumbernya lalu mengendapkannya di sedimen. Penelitian ini bertujuan untuk menganalisis karakteristik dan kelimpahan mikroplastik, menganalisis hubungan karakteristik sedimen dengan mikroplastik, serta menilai risiko mikroplastik melalui polymer hazard index. Pengambilan sampel sedimen menggunakan metode grab sampling. Analisis laboratorium dilakukan untuk mengidentifikasi bentuk, warna, ukuran dan jenis mikroplastik. Jenis mikroplastik yang ditemukan yaitu fiber, filamen, fragmen dan pellet dengan variasi warna seperti merah, kuning, biru, ungu, hitam, transparan, coklat dan silver. Mikroplastik juga ditemukan dengan ukuran yang bervariasi. Nilai PHI termasuk kategori sedang. Penelitian lanjutan diperlukan untuk memahami lebih dalam distribusi dan dampak mikroplastik serta upaya mitigasinya.
Co-Authors Aida Nursanti Akhyar Hasanal Arva Alvi Purwanti Arrabban Arif Cifebrima Suyastri Dewita Suryati Ningsih Diana Oktabrillian Garnasih Lestari Raden Gustina Adinda Putri Indah Nur Aini Jushermi Jushermi Koswita Rana Lili Sulastri Malau Arinah Asri Marzolina Marzolina Novita Dewi Nuzul Hafiizha Asyari Promalessy, Rika Rendra Wasnury Restuti Sri Sesariani Novita Siti Umi Kalsum siti umi kalsum Sri Restuti Sri Restuti Sri Restuti Suci Mayang Sari Zulaika Siti