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This Author published in this journals
All Journal IJOCE (International Journal of Offshore and Coastal Engineering) Tadulako Social Science and Humaniora Journal
Muhammad Zikra
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Religion Arts Humanities Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Social Sciences

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The Influence of Slopes to the Stability of Stones in front of Seawall Haryo Dwito Armono; Danny Indra Setyawan; Muhammad Zikra
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 2 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (649.635 KB) | DOI: 10.12962/j2580-0914.v1i2.7051

Abstract

Seawall is a coastal protection structure to prevent coastal erosion from wave forces. In this research, rubble-mound of stones are used as armor due to the availability of the material in coastal areas and ease of construction. A series of physical model tests with a scale of 1:25 with a variation of four wave heights (H), two wave periods (T), and three different slopes of rubble-mound in front of seawall were performed. Parameters used in the research are stability coefficient (KD),wave steepness (H/gT2), and percentage of damages (Do). The slope variations of rubble-mound were 1:1.15, 1:1.5, and 1:2. The experiments also displayed that the stone stability coefficient (KD) directly proportional with wave steepness (H/gT2). The value of KD for the seawall model with the slope angle of cot = 1.15 is 4.4, cot = 1.5 is 4.28 and cot = 2 is 3.02. From all three variations of slope, the most stable is on the slope 1:2 with the least damage impact on the model. The gentlest slope is the most stable structure.
Factors Affecting Work Fatigue in Workers of Process Plan Department Area at PT Citra Palu Minerals Muhammad Sabri Syahrir; Lusia Salmawati; Muhammad Zikra; Arwan
Tadulako Social Science and Humaniora Journal Vol. 4 No. 2 (2024): Tadulako Social Science and Humaniora Journal
Publisher : LPPM Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/sochum.v5i1.17182

Abstract

Work fatigue is a condition that causes a decrease in a person's efficiency and performance, so it can increase the occurrence of work accidents, and harm themselves and their companies, due to decreased productivity. The purpose of this study was to examine the effect of length of service, nutritional status, and workload on work fatigue in the processing planning department area at PT Citra Palu Minerals. This study uses quantitative research with a Cross-Sectional approach. The sampling technique in this study was determined by incidental sampling with a total sample of 54 respondents. Data collection using questionnaires, measuring instruments finger pulse oximeter, and body mass index calculation. Data analysis used is univariate, bivariate, and multivariate analysis. The results showed workload p value = 0.006 means it has a relationship with fatigue, nutritional status p value = 1,000 and tenure has p value = 0.188 means it does not have a significant relationship to fatigue in workers. The most influential factor on fatigue is workload with an Exp (B) value = 7.500.
Co-Authors Arwan Danny Indra Setyawan Haryo Dwito Armono Lusia Salmawati Muhammad Sabri Syahrir