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All Journal Jurnal Ilmu Kelautan Spermonde Jurnal Fokus Manajemen Bisnis
Sarwinda, Sarwinda
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Humanities Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Social Sciences

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PENGARUH HARI PERDAGANGAN TERHADAP RETURN SAHAM: PENGUJIAN MONDAY, WEEK-FOUR, DAN ROGALSKI EFFECT DI BURSA EFEK INDONESIA Sarwinda, Sarwinda; Asakdiyah, Salamatun
Jurnal Fokus Manajemen Bisnis Vol 3, No 2 (2013)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/fokus.v3i2.1341

Abstract

This research is aimed to test the influence of trading days to return its shares at the Indonesian Stock Exchange by using 31 stocks listed on the meantime, the LQ45 during the period of research February 2011-January 2013. Use sampling techniques of sampling purposive with criteria sample is actively traded shares during a period of research. In analyzing the study data used multiple linear regression analysis method with variable dummy. An independent variable in this research is trading days shares in the Indonesia Stock Exchange and the dependent variable, regression equation of which is used to test each hypothesis of this research is to return shares daily. Results of the research indicate that there is an influence of the trading days against the return of shares in Indonesia Stock Exchange. Return lowest is on Monday and highest return on Friday. Return on Friday that negative influenced by return on Monday that negative. The research found the Week-four effect, but research not proved the existence of Rogalski effect in Indonesia Stock Exchange.
CARBON ABSORPTION ANALYSIS THROUGH ORGANIC-C CONTENT IN SEDIMENT AT AMPEKALE MANGROVE ECOSYSTEM, MAROS REGENCY Rukminasari, Nita; Sarwinda, Sarwinda; Suwarni, Suwarni; Moka, Wilma Joanna Carolina
Jurnal Ilmu Kelautan SPERMONDE VOLUME 11 NUMBER 1, 2025
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35911/jiks.v11i1.43958

Abstract

Global warming represents a significant challenge, primarily driven by the escalating concentrations of greenhouse gases in the atmosphere, notably carbon dioxide (CO₂). Mangrove ecosystems are integral to climate change mitigation due to their capacity to sequester and store carbon within their biomass and sediment. This study sought to evaluate carbon sequestration through the analysis of organic carbon content in the sediments of mangrove ecosystems located in Ampekale, Maros Regency. Sampling was executed using a purposive sampling method across nine sites, employing a 50 × 5 cm corer. Each sediment sample was sectioned into five depth intervals (0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm, and 40-50 cm). The organic carbon content was assessed using the loss on ignition (LOI) method, with parameters measured including bulk density, sediment organic carbon concentration, carbon storage, and carbon uptake in sediments. Statistical analyses were conducted utilizing one-way and two-way ANOVA tests. The findings indicated that the mangrove ecosystem in Ampekale exhibited a total carbon storage in sediments of 731.72 tons/ha, with a total carbon uptake of 2685.42 tons/ha. The greatest carbon storage and uptake were observed at the 40-50 cm depth, with values of 342.056 tons/ha and 1255.34 tons/ha, respectively.
Co-Authors Moka, Wilma Joanna Carolina Nita Rukminasari Salamatun Asakdiyah, Salamatun Suwarni Suwarni