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All Journal Bioma : Jurnal Biologi Indonesia Grouper: Jurnal Ilmiah Perikanan LIMNOTEK Jejak digital: Jurnal Ilmiah Multidisiplin
Zahidah
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Social Sciences Veterinary Other

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DISTRIBUSI KAWASAN MANGROVE DI PULAU POTO KABUPATEN BINTAN MELALUI PENGINDERAAN JAUH Mochamad Candra Wirawan Arief; Iwang Gumilar; Zahidah; Heti Herawati; Perdana Putra Kelana; Sri Een Hartatik
Bioma Vol. 19 No. 2 (2023): Bioma
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/Bioma19(2).4

Abstract

Mangrove is a unique vegetation type growing along the coastline and estuarine in tropical and subtropical countries. Mangroves in Indonesia are distributed in all major islands and small islands from Aceh on westside stretched to Papua on the east. This study is to monitor the mangrove area in Poto island a small island part of Kabupaten Bintan, Province of Riau Kepulauan. The difference in spatial resolution of remote sensing data Sentinel 2A and Pleiades were used to classify the land use including the mangrove area. The supervised classification by maximum likelihood classification showed the high-resolution image using Pleiades has higher accuracy for mangroves 81.99% and overall accuracy 90% (kappa 0.86) compared to Sentinel 2A for mangrove 72,34% and overall accuracy 80% (kappa 0.73). The mangrove area approximately 257 ha is strip-lining along the coastline with the largest mangrove area located on the southside of the island. Further research is to identify the mangroves’ formation and the serial condition of mangroves on the different times.
Assessment of Natural Bentonite Efficacy for Dye Removal in Textile Wastewater Treatment : Implication for Mitigating River Citarum Pollution Fathan Nabhani, az; Zahidah; Herawati, Heti; Zulti, Fifia
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 30 No. 1 (2024)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2024.4848

Abstract

Textile industries contribute significantly to the economy but release harmful pollutants into the environment, especially rivers.  The effluent from the textile industry contained toxic dyes that can harm the river ecosystem.  Several studies have been conducted to reduce toxic dyes in a river system using bentonite as an adsorbent to reduce river pollution effectively.  However, the effectiveness of bentonite still needs to be tested again using textile liquid waste that has not gone through any waste processing at all.  Citarum is one of the main rivers on Java Island, which suffers from textile effluent, especially azo dyes which are toxic, mutagenic and carcinogenic which can harm the aquatic ecosystem.  Therefore, this study aims to implement natural bentonite as an adsorbent to remove dyes from textile wastewater.  We performed a laboratory test to adsorption on bentonite and textile wastewater considering the variation of adsorbent weight of 10 g and 20 g in 100 mL of textile wastewater stirred in an Erlenmeyer flask at room temperature for 0-300 minutes.  The initial concentration of textile wastewater used was 10%, 30%, and 50%.  We found that the maximum dye removal efficiency was 91.25% with 10% initial concentration treatment, 20 g adsorbent weight, and 60 minutes contact time.  Longer contact time will increase the removal efficiency and adsorption capacity, while higher adsorbent dosage will decrease the concentration of dyes in wastewater.  Efficient textile wastewater treatment has improved water quality, effectively meeting river water quality standards and environmental regulations.
Primary Productivity Based on Chlorophyll-a Concentration in the Luk Ulo River Estuary, Kebumen Regency, Central Java Rahma Wati, Yunita; Herawati, Heti; Akbarsyah, Nora; Zahidah
Grouper Vol. 16 No. 2 (2025): Grouper : Jurnal Ilmiah Perikanan
Publisher : Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/grouper.v16i2.325

Abstract

The Luk Ulo River estuary is one of the water areas in Kebumen Regency that leads directly to the Indian Ocean. The discharge of waste from river flows that lead into the Luk Ulo River estuary, along with sand and stone mining activities, is believed to be the primary cause of damage to the aquatic ecosystem. Water quality in a water body can affect the primary productivity of the estuary. The objective of this research is to evaluate the primary productivity by analyzing chlorophyll a concentration, which serves as an indicator of the trophic status of the water. This research was conducted from January to February 2025. This research utilizes the method of survey method with a purposive sampling technique. Based on the results of the research, the average chlorophyll a concentration in the Luk Ulo River Estuary ranges from 3.91 to 5.74 mg/m³. The average value of primary productivity during the study was in the range of 124.96-149.24 mgC/m3/day, including in less fertile waters, or can be said to be oligotrophic because the average is in the range of 0-200 mgC/m3/day. The water quality in the Luk Ulo River Estuary generally complies with Class II and III quality standards, as stipulated in Government Regulation No. 22 of 2021 regarding the Implementation of Environmental Protection and Management.
Upaya Meningkatkan Motivasi dan Hasil Belajar Siswa Kelas XI SMK Wikarya Karanganyar dengan Gamifikasi pada Mata Pelajaran Manajemen Perkantoran Zahidah
Jejak digital: Jurnal Ilmiah Multidisiplin Vol. 1 No. 5b (2025): AGUSTUS-SEPTEMBER
Publisher : INDO PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63822/bfnpqt28

Abstract

This research aims to describe the application of online gamification strategies in enhancing the learning motivation of Grade XI MPLB students at SMK Wikarya Karanganyar in the subject of Office Management, specifically the Human Resource Management (HRM) component. This study is a Classroom Action Research (CAR) conducted in two cycles. Each cycle consists of planning, observation, action, and reflection. The research subjects were 27 students in the 11th grade of SMK Wikarya for the 2024/2025 academic year. Data collection techniques included observation, learning motivation questionnaires, interviews, and documentation. Data analysis was conducted using descriptive comparative techniques and qualitative analysis. The validity testing techniques used were data source triangulation and reliability validity testing. The research results indicate that the implementation of online gamification can enhance students' learning motivation. This is evidenced by an increase in the average learning motivation score from 65.13 before the intervention to 68.40 in Cycle I, rising to 74.62 in Cycle II, and further increasing to 78.14 in Cycle III. Students became more active, enthusiastic, and demonstrated greater interest in learning. Challenges faced include limitations in information and communication technology devices and time constraints in classroom management. Solutions implemented include expanding internet connectivity with a Wi-Fi extender, providing detailed explanations of learning activities, simplifying learning materials, and strengthening time management. The conclusion of this study indicates that the implementation of online gamification can significantly enhance students' learning motivation. Teachers are advised to consider using gamification as an innovative and engaging learning strategy in today's digital age.  
Co-Authors Arief, Mochamad Candra Wirawan Fathan Nabhani, az Hartatik, Sri Een Heti Herawati heti herawati Iwang Gumilar Iwang Gumilar Mochamad Candra Wirawan Arief Nora Akbarsyah Perdana Putra Kelana Rahma Wati, Yunita Sri Een Hartatik Zulti, Fifia