bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Landsat-8 OLI/TIRS to assess the Urban Heat Island (UHI)
Authors: Karyati N E , Sholihah R I , Panuju D R , Trisasongko B H , Nadalia D , Iman L O S 
Published: December 2022

Abstract
Urban Heat Island (UHI) phenomenon is a particular climate change impact in urban areas that can trigger adverse effects on environmental conditions. This effect is usually worsened by increasing anthropogenic activities. While the impact of UHI has mostly been studied in metropolitans around the world, few studies are presented investigating the outcome in mid-sized cities. This study aims to assess spatial distribution of Urban Heat Island (UHI) in Bogor city, Indonesia, by utilizing thermal data (Band-10) from Landsat-8 OLI/TIRS. The Landsat imagery was acquired in May 2021, in the beginning of the dry season. The result of study shows Land Surface Temperature (LST) values ranged from 26.23 to 33.76°C, with an average temperature of 31.29°C, while the range of NDVI was between 0.08 to 0.55. Further, the correlation between Land Surface Temperature (LST) and Normalized Difference Vegetation Index (NDVI) was calculated to investigate the relationship between vegetation density and surface temperature condition for examining the outlook and possibilities to minimize the impact of UHI through improving vegetal conditions. A negative correlation suggests that expanding vegetation coverage can reduce urban heat island impacts by 35%, and other factors influence the rest. The land surface temperature threshold to determine UHI is 32.01°C, so the UHI area was identified at ca. 13.12 km2 around the city centre.
Mangrove rehabilitation planning with ecological and geospatial approaches in Cemara Village, Indramayu, West Java
Authors: Safira D A , Rusdiana O , Kusmana C 
Published: December 2022

Abstract
Several rehabilitation activities have been carried out by the government in Indramayu Regency, but have not been able to restore the condition of the mangrove. Hence, it is necessary to rehabilitate potential land. The aim of this study is to formulate the direction of rehabilitation planning in Cemara Village, Indramayu based on an ecological approach and mangrove ecosystem. The method used in this study is geospatial approach that is integrated with field quantitative data. The result shows that the total area that is potential to be rehabilitated in Cemara Village is 1,012.020 ha, which consists of 285.390 ha (28.2%) vegetated area and 726.630 ha (71.8%) non-vegetated area. Furthermore, the plan of rehabilitation in Cemara village is based on the consideration of mangrove typology, mangrove stand density, physical parameters, and land use. Recommendation for rehabilitating mangrove forest on land with low mangrove density and emergent land by performing intensive planting, on pond land by performing sylvofishery planting, on land with moderate mangrove density by enrichment planting, and on land with high mangrove density by carrying out maintenance for protective function.
Indonesian savanna fire-related spectral analysis
Authors: Vetrita Y , Santoso I , Kartika T , Prasasti I 
Published: December 2022

Abstract
Peat fires in Indonesia frequently result in ecological degradation and loss. Public attention has shifted to savanna fires, which are usually overlooked but have increased in frequency in recent years, surpassing the area of controlled peat fires in Indonesia. Mapping the short-lived burns in Indonesia’s savanna is challenging. Only a few studies have examined fires in the Indonesian savanna, specifically the spectral responses associated with fires. Our study aims to analyse spectral changes caused by fires in Sumba Island, East Nusa Tenggara, Indonesia using field data and satellite images (Sentinel-2 and Landsat 8). We plotted the spectral values from blue to middle infrared bands for each burned and unburned site. In addition, we investigated the time series associated spectral indices for each site to determine how long spectral changes can be noticed immediately following fire incidents. Our research discovered that vegetation regrowth occurred rapidly (within two months), obscuring the detection of burned areas in the savanna. The red, near infrared, and middle infrared bands (>1,300 nm) were found to be the optimal spectral bands for discriminating between savanna vegetation regrowth and newly burned areas. Our findings will assist the Indonesian government in improving the mapping of burned areas for the purposes of national fire management.
The capability of Sentinel-1 polarization combinations for oil spill detection (study case: Karawang, Indonesia)
Authors: Afgatiani P M , Suhadha A G , Ibrahim A 
Published: December 2022

Abstract
Marine pollution is one of issues that is widely discussed such as marine debris, chemical contamination, and oil spill. It has many impacts on the environment. Remote sensing helps detect the presence of an oil spill via satellite platform. One commonly used satellite is Synthetic-Aperture Radar (SAR) imagery, which can see oil spills even in cloudy conditions. However, the black and white appearance of the radar sometimes makes it difficult to distinguish between an oil spill and look alike. Therefore, this study aims to determine the polarization combination in the Sentinel-1 SAR imagery. Sentinel-1 Single Look Complex (SLC) is used as input and processes through various stages to obtain Coherence Vertical-Vertical (VV) and Vertical-Horizontal (VH) results. There are four steps for processing the data; convert the data to backscattering coefficient from SLC data, stacking, Terrain Observation by Progressive Scan (TOPS) coherence, and building the robust combinations. The polarization in the Sentinel-1 was calculated to determine artificial bands for the correct combination, namely Divide (VV/VH) as band 1, Average ((VV+VH)/2) as band 2, Multiple (VVxVH) as band 3, Add (VV+VH) as band 4, and Subtract (VV-VH) as band 5. Furthermore, the determination of the band used in the polarization composite display is based on the intensity value. As a result, the recommendation for Sentinel-1 polarization is obtained, which involves bands 2, 3, and 5.
Water quality and biophysical condition for tourist activities in Situ Rawa Kalong Depok City, West Java, Indonesia
Authors: Widyawati K , Kusmana C , Pertiwi S , Sulistyantara B 
Published: December 2022

Abstract
Having a role as the water resource, situ water quality and biophysical conditions are the main components that reach the basis of sustainability analysis. This study aims to analyze the water quality and biophysical conditions of the Situ Rawa Kalong area as the basis for achieving sustainable management. The description of existing and potential conditions uses descriptive qualitative methods and scoring to measure the factors of water quality, lake quality, and tourism suitability. The literature study used secondary data from The Sanitation and Environmental Office of Depok City in the form of the Situ Rawa Kalong water quality data 2016-2020 and other sources. A field survey was conducted by measuring, mapping with GIS, and documenting. It concerns such data on vegetation, fauna, hydrology, morphology, climate, carrying capacity, topography, facilities, and infrastructure. The result is that Situ Rawa Kalong has limitations in determining the type of recreation. It is a non-contact and a view recreation. The types of tourism are meant for boating, fishing, and scenery recreation. The general biophysical condition of Situ Rawa Kalong is disturbed. As a potential water resource and tourism in Depok, Situ Rawa Kalong must be managed sustainability.
Bibliometric and meta-analysis studies of the correlation between macrozoobenthos abundance and mangrove density
Authors: Nihan A R K , Kusmana C , Krisanti M , Tiryana T , Ulumuddin Y I 
Published: December 2022

Abstract
Several attempts have been made to detect the condition of the mangrove ecosystem. Although the method used to detect the state of the mangrove ecosystem faces numerous challenges, it has yet to describe the functional structure of the mangrove ecosystem about its environment. Therefore, this study provides an overview of research trends regarding the relationship between macrozoobenthos abundance and mangrove forest density. This study aims to conduct bibliometrics and meta-analysis related to the abundance of macrozoobenthos and mangrove density. First, a bibliometric analysis to see research gaps using VOSviewer, the source of bibliometric data comes from GScholar and Scopus with the keywords mangrove search and meta-analysis. The number of articles filtered and processed using VOSviewer is 497 articles. After looking for gaps, the researchers conducted a meta-analysis to see the relationship between the abundance of macrozoobenthos and the density of mangroves. This study shows that no meta-analysis discusses the relationship between macrozoobenthos abundance and mangrove density. The results of the meta-analysis process found a strong relationship between mangrove density and macrozoobenthos mass with a significance value of < 0.001 and I^2 = 97.37.
Health assessment of The Upper Citarum Watershed, West Java, Indonesia
Authors: Sapan E G A , Riandasenya S A R , Yulianingsani  , Anisah  , Ilmi M K , Habibie M I 
Published: December 2022

Abstract
Citarum watershed is one of the national priority watersheds. Watershed health assessment activities are used as a reference in efforts to restore watershed conditions and improve watershed management planning. The watershed health was assessed for the Upper Citarum watershed in West Java, Indonesia. Three indicators, including hydrology and land cover were used to assess the watershed health. Hydrology indicators include the Annual Flow Coefficient (KAT) and River Regime Coefficient (KRA). Watershed health level assessment was conducted using Analytical Hierarchy Process (AHP) scoring method. Watershed health levels such as very unhealthy, unhealthy, moderately unhealthy, healthy, and very healthy were obtained by calculating each indicator total number of scores. From the health assessment result of The Upper Citarum watershed, the Annual Flow Coefficient indicator shows an unhealthy level, and River Regime Coefficient indicator shows very unhealthy level. In addition, the land cover indicator shows unhealthy level. Thus, because of a decreased vegetation cover over ten years. Based on the AHP weighting, it was found that The Upper Citarum watershed is at a very unhealthy level. Therefore, according to government regulations about proper watershed management, land cover vegetation must be managed to increase conservation and water quantity to maintain the Citarum watershed’s sustainability.
Flood Inundation Distribution Modelling for River Boundary Management in Cisadane Sub-Watershed
Authors: Hasibuan M A S , Widiatmaka  , Tarigan S D , Ambarwulan W 
Published: December 2022

Abstract
Cisadane watershed is one of the priority watersheds to be restored immediately. The Cisadane River has the potency to cause floods in the river’s border region due to a reduction in river width, river depth, and land-use changes. This study aims to analyze the distribution of flood inundation by employing the HEC-RAS. Flood distribution modeling using components the flood distribution in the steady flow of water level profile component. The permanent flow use is 19 January 2022 discharge. Scenarios discharge was reported with a return period of 5, 10, 25, 50 and 100 years. Digital Elevation Model (DEM), discharge, watershed boundary, and land use maps are included in the data used. The results indicated that 30 districts were affected by the flood. The extent of the annual flood inundation is predicted to expand by 24.41 hectares per year throughout each discharge period. Teluk Naga, Sepatan Timur, Paku Haji, and Neglasari Districts have the broadest and deepest probablility inundation in Tangerang Regency, with a total inundation area 644,7 hectares (permanent flow). The depth will increase from 0.40 to 1.33 m as the return period discharge rises. Tangerang Regency, located in the Lower Cisadane watershed, is the most affected area.
Growth performance of planted mangrove seedlings on an intertidal area of the Bali Sea
Authors: Kusmana C , Mulyana D , Gunarso P , Tambayong K , Juniartini S , Dwiyanti F G 
Published: December 2022

Abstract
Mangrove ecosystems have various services, one of them being a barrier to strong waves and seawater currents. Growing mangroves in the physical environment with sandy soil, high differences between high and low tides, big waves, and strong seawater currents such as in the Bali Sea under a highway interchange is not easy. To cope with this kind of less-understood environmental condition, the experiment planting was done by applying three kinds of planting techniques: mangrove incubator (guludan), strip line planting, and cluster planting using the mangrove (Rhizophora mucronata) seedlings having sufficient tolerance to high salinity and sandy soils. Two months after planting, the tree planting techniques showed a high percentage of survival of planted seedlings (PSS=100%) and well healthy growing performance of seedlings (no infected by pest and disease), the average increments of seedling stem diameter ranged from 0.73 to 1.15 mm, height ranged from 8.70 to 10.98 cm, and the number of leaves ranged from 1.08 to 1.45 pieces in a month. Furthermore, the best planting technique was the mangrove incubator (guludan) in terms of stem diameter growth, while the strip line and cluster techniques were the best in terms of seedling height growth.
Successful semen collection and cryopreservation of Banteng semen (Bos javanicus) using an artificial vagina
Authors: Setiadi D R , Mulia B H , Widianti A , Manansang J , Hastuti Y T , Yoelinda V T , Agil M , Arifiantini R I , Nugraha T P 
Published: December 2022

Abstract
Gamete collection is feasible in Banteng (Bos javanicus) and is essential for conserving this species. The common practice of semen collection in wild animals is using the electroejaculation technique which is considered invasive with lower-quality results. This study aims to develop sperm collection further using an artificial vagina and to investigate the sperm motility of Banteng after being frozen-thawed. A Banteng bull kept in Taman Safari Indonesia was used for this study. Before semen collection, the bull is acclimatized to collection conditions. Semen collection is done once a month for six months. The semen was evaluated according to a method for bovine semen. Cryopreservation of semen was performed using an Andromed® extender, in 0.25 mL Ministraw®, and equilibrated at 4°C for 3 hours, followed by freezing in liquid nitrogen vapor. Quality testing was performed using the CASA IVOS II™. The result showed variations between batches, with the number of mountings 9.83±2.86(7-15) times, semen volume 8.42±1.42 (6-9) mL, straw produced 152±15.23 (130-172) straws, and total motility after thawing 44.28 ±12.14, (26.83-55.96). The quality of frozen semen of the later batch showed better results p<0.05. In conclusion, the collection of Banteng semen using an artificial vagina showed promising results with moderate quality.
Sustainability level of Silvofishery ponds on the coast of Semarang City
Authors: Muthoh R F , Santoso N , Mulatsih S 
Published: December 2022

Abstract
Silvofishery ponds are aquaculture areas while maintaining their ecological functions as conservation of mangrove ecosystems. Coastal community of Semarang City is one of those that cultivate it, and the main commodity is milkfish (Chanos chanos). This research was carried out on five dimensions; ecology dimension, economic dimension, social dimension, technological dimension, and ethics dimension using the RAPFISH (Rapid Appraisal for Fisheries) analysis method. Types of ponds developed in the design of komplangan. The level of sustainability of the silvofishery ponds management is 43.02%, with less sustainable categories in different indexes and dimensions, namely: The ecological dimension 32.02% (less sustainable), economic dimension 45.63% (less sustainable), social dimension 50.61% (entirely sustainable), technological dimension 49.77% (less sustainable), and ethics dimension 36.06% (less sustainable). The results of the leverage analysis on each dimension indicate the need to improve the management of sensitive attributes in each dimension. Sensitive indicators in Silvofishery ponds management are ecological dimension (mangrove density), dimension (market orientation), social dimension (access to use by the community), technological dimension (air circulation), ethics dimension (non-formal institutions). All measurements have a Monte Carlo value that difference is <1; therefore, the results of the Silvofishery ponds management are following the real conditions in the field.
Carbon sequestration potential of rubber plantation in East Kalimantan
Authors: Lestari N S , Noor’an R F 
Published: December 2022

AbstractForestry and Other Land Use (FOLU) sector has significant contributions to greenhouse gas emissions in Indonesia. Besides reducing deforestation and forest degradation, plantation development also plays an important role in climate change mitigation, particularly for carbon stock enhancement. This study aims to estimate the carbon sequestration potential of rubber plantations in East Kalimantan. Rubber plantation carbon stock was measured by establishing 24 sample plots with the size of 20x20 m in two locations, Kutai Timur and Penajam Paser Utara regencies. Above-ground biomass of rubber was estimated using the allometric equation AGB = 0.144 x D2.40. While the carbon stock was further calculated using the lifetime average approach. The result shows that the carbon stock of rubber plantations in East Kalimantan is 75.71 tons C ha-1. With a total plantation area of 123,460 ha, the potential carbon sequestration of rubber plantations in East Kalimantan is about 9.05 Mt, equivalent to 33.19 Mt CO2e. Given the high carbon sequestration potential, rubber plantation development needs to be considered as an important strategy to achieve FOLU net sink by 2030. This is part of the enhancement of carbon stock through land rehabilitation, which is prioritized to be implemented in degraded lands to avoid deforestation and forest degradation in forested areas.
Numerical study of vortex-induced autorotation of an elliptic blade in lid-driven cavity flow
Authors: Hosseinjani Ali Akbar , Akbari Ghasem 
Published: December 2022

Abstract
Large-scale eddies in a lid-driven cavity are potential sources of angular momentum which can induce rotational effect in a free-to-rotate inertial body due to fluid–structure interaction. The novel objective of the present study is to investigate vortex-induced autorotation of an elliptic blade hinged at the centre of a lid-driven cavity. The governing equations are numerically solved using iterative direct forcing immersed boundary method. The impact of Reynolds number and blade length on dynamics characteristics of the blade are analysed. Considering left to right motion of horizontal top lid, four different vortex-induced modes are identified as the steady blade response, including stationary position, small-amplitude fluttering, clockwise autorotation and counter-clockwise autorotation. Long blades are mostly potential for steady clockwise autorotation, particularly in higher Reynolds numbers, due to dominance of principal near-wall cavity vortex compared to other vortices. In contrast, effective role of central counter-clockwise vortex in a short blade and weak interaction of such blade with the near-wall cavity vortex leads to a steady counter-clockwise rotation, particularly in high Reynolds numbers. In the case of low Reynolds numbers or blade with moderate length, vortex-induced blade motions in clockwise and counter-clockwise directions are fairly balanced, leading to stationary position or small-amplitude fluttering modes.
Broadband optical transmission through two-dimensional hole arrays
Authors: Cui Xiao-bin , Huang Cheng-ping 
Published: December 2022

Abstract
We suggest that a metal film perforated with two-dimensional (2D) hole arrays can support broadband optical transmission. This phenomenon is based on the impedance matching between the perforated metal film and incoming light waves at oblique incidence. Theoretical formulas for the effective impedance of the hole arrays and Brewster angle of broadband transmission have been derived in the infrared regime, taking account of the field penetration effect on the hole walls. With the numerical simulations, the predicted optical effect has also been demonstrated. Compared with the narrow transmission band due to surface-plasmon polariton resonance, our results present a non-resonant, broadband, and robust transmission channel for the 2D hole arrays.
Electrical tuning of moiré excitons in MoSe2 bilayers
Authors: Hagel Joakim , Brem Samuel , Malic Ermin 
Published: December 2022

Abstract
Recent advances in the field of vertically stacked 2D materials have revealed a rich exciton landscape. In particular, it has been demonstrated that out-of-plane electrical fields can be used to tune the spectral position of spatially separated interlayer excitons. Other studies have shown that there is a strong hybridization of exciton states, resulting from the mixing of electronic states in both layers. However, the connection between the twist-angle dependent hybridization and field-induced energy shifts has remained in the dark. Here, we investigate on a microscopic footing the interplay of electrical and twist-angle tuning of moiré excitons in MoSe2 homobilayers. We reveal distinct energy regions in PL spectra that are clearly dominated by either intralayer or interlayer excitons, or even dark excitons. Consequently, we predict twist-angle-dependent critical electrical fields at which the material is being transformed from a direct into an indirect semiconductor. Our work provides new microscopic insights into experimentally accessible knobs to significantly tune the moiré exciton physics in atomically thin nanomaterials.
Plasma etching and surface characteristics depending on the crystallinity of the BaTiO3 thin film
Authors: Lee Han Byeol , Joo Young-Hee , Patil Harshada , Kim Gwan-Ha , Kang Insu , Hou Bo , Kim Deok-kee , Um Doo-Seung , Kim Chang-Il 
Published: December 2022

Abstract
Due to its high dielectric constant (κ), the BaTiO3 (BTO) thin film has significant potential as a next-generation dielectric material for metal oxide semiconductor field-effect transistors (MOSFETs). Hence, the evaluation of the BTO thin film etching process is required for such nanoscale device applications. Herein, the etching characteristics and surface properties are examined according to the crystallinity of the BTO thin film. The results demonstrate that the etching rate is low in the high-crystallinity thin film, and the surface residues are much lower than in the low-crystallinity thin film. In particular, the accelerated Cl radicals in the plasma are shown to penetrate more easily into the low-crystallinity thin film than the high-crystallinity thin film. After the etching process, the surface roughness is significantly lower in the high-crystallinity thin film than in the low-crystallinity thin film. This result is expected to provide useful information for the process design of high-performance electronic devices.