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Harahap, Arman
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Journal : international journal of science technology

 1 
Analysis of the Quality of the River Kualuh in the Review of the Physical-Chemical Rosenta, Ika; Lihardo Hulu, Irwan; Harahap, Arman; Maini Hasibuan, Kiki; Nwazonobi, Patrricia; Mustika Piliang, Fenny
International Journal of Science, Technology & Management Vol. 5 No. 4 (2024): July 2024
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v5i4.1128

Abstract

The purpose of this study is to analyze the water quality of the river and the status of water quality of watersheds Kualuh Kabupaten Labuhanbatu. Sampling was done at 3 monitoring points along the flow of the river Kualuh Kabupaten Labuhanbatu. The determination of the sampling points in the field using the purposive sampling method, with the determination of the sampling points based on the differences in the characteristics found in the study area.Some of the parameters measured were temperature, conductivity, COD, BOD, and oil/ fat are then compared with the criteria of the Raw water Quality of the river class II according to PP R. I. No. 82 Year 2001.On Water Quality Management.Based on the results of the analysis of the obtained results that in the area of monitoring point 1, is the most polluted areas.This is because, in this area there is the activity of a diverse community.Household produces waste that comes from the activity of the bathroom, toilet, kitchen, washing clothes and washing of household appliances.
Analysis of Rewards and Punishment on the Performance of State-Owned Enterprise Employees in Medan Region Suwarno, Bambang; Harahap, Arman
International Journal of Science, Technology & Management Vol. 6 No. 1 (2025): January 2025
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v5i4.1199

Abstract

Motivating workers through the use of rewards and punishments, the management control system places an emphasis on output. Any decent employee will follow the rules set out by their employer and will push for their coworkers to do the same. Finding out whether company rewards and punishments have an effect on employee performance in a State-Owned Enterprise is the main objective of this study. Quantitative studies employ non-probability purposive sampling and associative causality studies. With the aid of SmartPLS, descriptive statistics were applied to 100 questionnaires. All of the study's variables were found to have a positive and statistically significant effect. With a t-statistic value of 4.218, employees believe that the company's performance reviews can positively affect their pay, benefits, and advancement opportunities. The company's punisment motivate employees to perform well in order to avoid pay cuts and promotion delays (t-statistic value 4.861). When workers' expectations regarding company assessments and reward are satisfied, their performance improves (t-statistic value 3.900). Therefore, it is reasonable to assume that, with proper implementation of evaluation and sanctions, staff performance will improve. While punishments are the most powerful incentive for improving performance, this study's original finding is that positive reinforcement in the form of awards can inspire loyalty and good conduct.
Plankton Diversity in Aek Rao River Gunung Tua Rosenta Purba, Ika; Harahap, Arman
International Journal of Science, Technology & Management Vol. 3 No. 6 (2022): November 2022
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v3i6.687

Abstract

The purpose of this study was to determine the index of plankton diversity in the Aek Rao River, Gunung Tua. The research was carried out from April to May 2022 in the Aek Rao River, Gunung Tua. The sampling method used purposive random sampling which consisted of 3 observation stations, namely station 1 upstream, station 2 for residential areas and station 3 for densely populated areas. The results showed that the composition of plankton in the Aek Rao River, Gunung Tua consisted of 3 classes of phytoplankton, namely Bacillariophyceae, Chlorophyceae and Cyanophyceae, while the zooplankton class consisted of 4 classes, namely Mastigophora, Monogononta, Crustacea and Ciliophora. The highest diversity index in phytoplankton was obtained at station 1 of the sand mining area with a value of 1, 39 which indicates that the level of diversity is in the medium category. In zooplankton the highest diversity index was found at station 3 with a value of 0.33 which indicated that the level of diversity was included in the low category. While the highest dominance index for phytoplankton was found at station 3 in densely populated areas with a value of 0.43 while zooplankton was found at station 1 in a sand mining area with a value of 0.00563, both values ??indicated that there was no dominant plankton genus in that area.
The Diversity Of Macrozoobenthos River Aek Buru District Labuhan Batu Utara Harahap, Arman
International Journal of Science, Technology & Management Vol. 4 No. 5 (2023): September 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v1i3.742

Abstract

Benthos are organisms that live in the bottom of the waters, either animal or plant, living on the surface and in the bottom of the waters. This study aims to determine the diversity of Macrozoobenthos in the River Aek Buru. The study began in May 2021 to June 2021. Sampling of macrozoobenthos done using a Surber net. based on differences in the substrate at the base of the river. Macrozoobenthos found in the Aek Buru consists of two Phyla, namely the Arthropods and Mollusks. Phylum Arthropoda are found is of the class of Insects belonging to the genus Hydropsyche, Polycentropus, psephenus, Dryops, Anthopotamu, Acroneuria and Triops. The phylum of Mollusks that are found are from a class of Bilvavia included in the Genus Corbicula and of the class of Gastropods of the Genera Melanoides and Melanatria. The abundance of macrozoobenthos of the highest on each of the stations is Polycentropus (66,67 ind/L) and Potadoma (266,67 ind/L). The abundance of macrozoobenthos of the highest found is Melanatria by 622,2 ind/L. Based on the value of the Index of Diversity (H) (0,367 – 0,602) the index of dominance (C) (0,132 – 0,386) and the evenness (E) (0,367 – 0,602) River Aek Buru in the category good condition with high species diversity. Physical and chemical factors of the water body capable of supporting life macrozoobenthos.
Analysis of Differences in Well Water Quality Tests in the Highlands and Lowlands of Rantauprapat City Harahap, Arman
International Journal of Science, Technology & Management Vol. 4 No. 1 (2023): January 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i1.771

Abstract

The existence of clean water is very important considering the very dynamic activities of people's lives. Therefore, the quality and quantity must be considered. Clean water that meets health requirements must be free from pollution and must meet quality standards: one of them is physical requirements because drinking water that does not meet quality standards can cause health problems. The topography of an area can affect groundwater in that area. This study aims to analyze differences in the quality of well water in the highlands of Rantauprapat City and the lowlands of Rantauprapat City based on physical parameters. The research was conducted at the BTKL Physics Laboratory in Medan in October 2022. The method in this research was observational analytic with a cross-sectional approach. The sample was determined by purposive sampling which amounted to 50 samples. Data were analyzed using SPSS 21 and the Mann Whitney-U Test. The results showed that there was no significant difference in water quality in the parameters of taste, temperature, odor and turbidity with a p value > 0.05, while there were significant differences in the parameters TDS and DHL with a p value <0.05. Conclusion: There are no significant differences in water quality in the parameters of taste, temperature, odor and turbidity, while in the TDS and DHL parameters there are significant differences in water quality with a p value <0.05. 0.05 while the TDS and DHL parameters are significantly different with a p value <0.05. Conclusion: There are no significant differences in water quality in the parameters of taste, temperature, odor and turbidity, while in the TDS and DHL parameters there are significant differences in water quality with a p value <0.05. 0.05 while the TDS and DHL parameters are significantly different with a p value <0.05. Conclusion: There are no significant differences in water quality in the parameters of taste, temperature, odor and turbidity, while in the TDS and DHL parameters there are significant differences in water quality with a p value <0.05.
Correlation of Macrozoobenthos Diversity Index with Physico-Chemical Factors in Lake Toba, Toba Samosir Regency Sinambela, Masdiana; Simangunsong, Mariana; Simorangkir, Andreas; Harahap, Arman
International Journal of Science, Technology & Management Vol. 4 No. 3 (2023): May 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i3.829

Abstract

This study aims to determine the macrozoobenthos in Lake Toba, Toba Samosir Regency. This research was conducted from May to July 2018. Determination of research stations based on environmental baseline consisted of 4 stations, namely station 1 in Lumban Binanga Laguboti village, station 2 in Lumban Bul-bul Balige, station 3 in Lumban Binanga Sigumpar, and station 4 in Hutagaol Sigumpar. Samples were taken using Eckman Grab at 3 times at each station. The macrozoobenthos found consisted of two classes, three orders, eight families, 15 species with a total of 565 individuals. The species found were Brotia subgloriosa, Brotia peninsularis, Brotia castulata, Pomacea diffusa, Pomacea paludosa, Filopaludina polygramma, Filopaludina sp., Melanoides tuberculata, Lymnaea sp., Emilia sp., Corbicula sumatrana, Corbicula fluminea, Corbicula japonica, Pilsbryoconcha exilis, and Anodonta sp.. The macrozoobenthic species with the highest number of individuals was Corbicula sumatrana with 141 individuals and the least was Lymnea sp. by 1 individual. The macrozoobenthos ecological analysis included the average density of 2260, the average diversity index of 1.282, the average uniformity index of 0.633, and the average dominance of 0.390. Then correlated with physico-chemical factors using Pearson correlation (r). Correlation of diversity index with physico-chemical factors from the strongest to the weakest starting from depth and phosphate, turbidity, temperature, pH, BOD, and DO.
Co-Authors Abdul Rauf Anang Susanto Arman, Iman Aslan Aslan, Aslan Ayu Larasati Bangun, Budianto Dieudonne, Bitondo Elistia, Elistia Febriani, Budi Gulo, Nur'Ainun Haholongan Sidabukke, Simon Harahap, Aziddin Harahap, Nurlina Ariani Harahap, Paramadi Hasmi Syahputra Harahap, Hasmi Syahputra Hilwa, Walida Indra, Gunawan Julissa Ek-Ramos, Maria Lihardo Hulu, Irwan Mahadewi, Erlina Puspitaloka Maini Hasibuan, Kiki Mandala Putra, Juniawan Masdiana Sinambela Mohamad , Siarudin Mohamad Reza Hilmy Muhammad , Rizwan Muniroh, Muniroh Mustika Piliang, Fenny Nasution, Agustina Nisa, Puspita Chairun Nwazonobi, Patrricia Pane , Rahmadani Panjaitan, Bernat Pardamean Nasution, Muda Pardamean, Muda Rafika, Mulya Rahmanta Rahmanta, Rahmanta Richi Andrianto Rosenta Purba, Ika Rosenta, Ika Salomon, Sam Sarifuddin Sarifuddin Silviana Mustikawati, Intan Simangunsong, Mariana Simangunsong, Simangunsong Simorangkir, Andreas Siregar, Nur Safrani Sudarijah Sudarmika, Dina Sukardi Sukardi Sulaiman, Harahap Sumitro Sumitro Suryari Purnama Suwarno, Bambang Syafrudin , Syafii Syahputra Harahap, Hasmi Syahputra, Dicky Ananda Syawa Harahap, Fitra Syawal Harahap, Fitra Walida, Hilwa Zairil, Zairil