Article Per Year (5 Year)
p-Index From 2021 - 2026
0.408
P-Index
This Author published in this journals
All Journal Journal of Earth Kingdom The Journal of City: Branding and Authenticity
Winny Liliawati
Department of Physics Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia, Bandung, West Java 40154
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Environmental Science Social Sciences Transportation

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
How dark is the night sky? A preliminary assessment of light pollution and astrotourism potential Danny Firmansyah; Yaumil Khairin Septiani; Ilham Ramdhani; Nur Fadhillah; Winny Liliawati; Cahyo Puji Asmoro
The Journal of City: Branding and Authenticity Vol. 4 No. 1: (July) 2026
Publisher : Institute for Advanced Science Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/jcbau.v4i1.2026.3833

Abstract

Background: Light pollution degrades night sky quality and may limit opportunities for astronomy-based tourism (astrotourism). Although Batu City has astrotourism potential, information on its night sky quality remains limited. This study characterized night sky brightness in Batu District, compared field measurements with Light Pollution Map (LPM) data, and evaluated its implications for astrotourism. Methods: Night sky brightness was measured at six observation sites in Batu District using a D.I.Y-CJ'01 photometer equipped with a TSL237 sensor. Measurements were conducted at the zenith under suitable weather conditions for 2–3 minutes at each site. Data were expressed in mag/arcsec², classified using the Bortle Scale, and compared with LPM data. Findings: The average night sky brightness ranged from 11.81 to 18.10 mag/arcsec². The highest value occurred in a peripheral residential area and the lowest in a commercial area. Most sites were classified as Bortle Class VIII–IX, indicating city to inner-city sky conditions. LPM estimated darker skies (19.79–20.46 mag/arcsec²; Bortle Class IV–V) than field measurements, although both showed decreasing sky quality with increasing urban activity and artificial lighting. However, the findings should be interpreted with caution because of methodological limitations, including measurement duration, technical limitations of the instrument, differences between photometer and LPM measurements, and uncontrolled environmental factors. Conclusion: The results indicate substantial light pollution in Batu District, making most surveyed locations less suitable for astrotourism. However, variations in sky brightness suggest that other areas of Batu City may still support astrotourism. These findings are expected to guide regional planners and tourism stakeholders in formulating artificial lighting management policies that support the sustainable development of astrotourism in Batu City. Novelty/Originality of this article: This study provides a preliminary field-based assessment of night sky brightness, light pollution, and astrotourism potential in Batu District through direct photometric measurements and LPM comparison.
Comparative characterization of water quality based on physicochemical parameters from various water sources Yaumil Khairin Septiani; Winny Liliawati; Danny Firmansyah; Ilham Ramdhani; Nur Fadhillah
Journal of Earth Kingdom Vol. 4 No. 1: July (2026)
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/jek.v4i1.2026.3831

Abstract

Background: Water quality varies substantially across source types, yet field-based comparative assessments spanning natural, household-consumable, and potentially contaminated water within a single urban highland setting remain scarce in Indonesia. This study characterized and compared the physicochemical quality of 14 water samples across three source categories in Bandung, West Java, and evaluated their alignment with regulatory standards and product-labeled claims. Methods: Samples were collected through grab sampling and measured in situ using a portable multiparameter pH meter for pH, electrical conductivity (EC), total dissolved solids (TDS), salinity, and temperature. Descriptive statistics and Pearson correlation analysis were performed using IBM SPSS Statistics. Findings: Considerable variation was observed across source categories: mean pH 6.69 ± 0.77, EC 183.24 ± 141.00 μS/cm, TDS 134.86 ± 95.93 ppm, salinity 128.13 ± 90.55 ppm, and temperature 23.24 ± 1.17°C. Six of 14 samples recorded pH below the minimum threshold of 6.5, including tap water (5.20), unboiled gallon water (5.80), two packaged mineral water brands, and both domestic wastewater samples. A very strong positive correlation was found between EC and TDS (r = 0.984, p < 0.001), confirming EC as a reliable field proxy for TDS estimation. Conclusion: Two packaged mineral water products marketed with alkaline pH claims showed discrepancies of more than one pH unit between measured and labeled values. These findings confirm that water source category is a primary determinant of physicochemical quality, underscoring the need for strengthened monitoring of distributed water supply systems and post-market verification of pH claims in Indonesia. Novelty/Originality of this article: The novelty lies in the first integrated field-based comparison across three functionally distinct water source categories combined with systematic verification of alkaline pH label claims in the Indonesian context.
Co-Authors Cahyo Puji Asmoro Danny Firmansyah Danny Firmansyah Ilham Ramdhani Ilham Ramdhani Nur Fadhillah Nur Fadhillah Yaumil Khairin Septiani Yaumil Khairin Septiani