bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nonlocal fermions with local interactions and the SYK model
Authors: Levine G C 
Published: June 2024

Abstract
One of the most promising routes to non-fermi liquids and strange metals has been through SYK models (Sachdev 2010 Phys. Rev. Lett.
105 151602) which necessarily involve large flavor degrees of freedom and interactions with imposed disorder. We introduce an interacting model of nonlocal spinless fermions in which large flavor and effective disorder emerge spontaneously in the extreme nonlocal limit. This model may be thought of as an expansion in a dimensionless ‘locality scale,’ α, with the limit

α
→
0

recovering a conventional local action. For finite α, the resulting interacting nonlocal action exhibits a large number of low-energy degrees of freedom—proportional to α—and the structure factor mediating the local interactions between these fermions is effectively random for large α. In one dimension, with finite α, we show that interactions are marginal to the one loop level (as they are in the conventional local case), preserving a gapless phase. At large α the interaction strength becomes comparable to the bandwidth and we analyze this large flavor limit in a manner similar to the diagrammatic approach to SYK. As α is increased we argue that the gapless phase established by conventional RG possibly crosses over to a gapless SYK phase, although the ‘melon’ diagrams are not exclusively dominant. We speculate on how this model might arise physically from an S-matrix connecting pure excited states—rather than the vacuum—to access finite temperature interacting fermions.
Extreme Marine Heatwaves in the Southern Java during 2016
Authors: Beliyana E , Tarya A 
Published: June 2024

Abstract
In this manuscript, we investigated the characteristics of marine heatwaves (MHWs) in southern Java and the effect of local (air-sea heat flux) and remote forcing (El Niño–Southern Oscillation/ENSO and Indian Ocean Dipole/IOD) on the formation of MHWs. We utilized remote sensing data from the National Oceanic and Atmospheric Administration Optimum Interpolation Sea Surface Temperature V2.1 dataset and European Centre for Medium-Range Weather Forecasts Interim reanalysis, covering the period 01 January 1982 to 31 December 2021. The datasets were processed by statistical analysis using MATLAB. We found that the most prolonged durations and the highest cumulative intensities of MHWs in southern Java were recorded during 2016, spanning approximately 255 days and 419.28 °C, respectively. During 2016, the combination of El Niño decay and negative IOD led to optimal warm conditions for long-lasting MHWs and hit southern Java throughout the year. Furthermore, this research highlighted a stronger correlation between ENSO and MHWs in southern Java compared to the IOD, with a 5–8 months lag time. We suggest that long-lasting MHW events may have serious implications for social and ecological systems. Therefore, an in-depth and comprehensive understanding of MHWs due to ongoing climate change becomes an urgent matter to predict such extreme events.
Ocean Circulation and Variability in the Seram and Northern Banda Seas
Authors: Dompeipen A C , Rumohoira D R , Atmadipoera A S , Nabil  , Apriansyah  , Nugroho D , Natih N M N 
Published: June 2024

Abstract
The Seram and Banda Seas (SBS) convey the eastern pathway of Indonesian Throughflow (ITF) from Maluku and Halmahera inflow portals. This study aims to investigate circulation and variability at near-surface and thermocline layers in the SBS region using validated INDESO model output datasets (2008-2015). It is shown that much warmer and saltier thermocline ITF water (24,36°C and 34,65 psu) from Halmahera is predominant, flowing southward and impinging on the northern coast of Seram near 128.5°E. The flows then bifurcate eastward into the Banda outer ring arc and westward into Banda via the Manipa Strait and western Seram Seas. In Banda, two clockwise eddies are found related to these inflows. Secondary southward inflow via Lifamatola is associated with cooler and less salty water (23,3°C and 34,45 psu), which merges with ITF Halmahera. The variability of oceanographic parameters is dominated by the annual period. However, on an interannual scale, the response of seawater temperature to ENSO is evident, and its amplitude, as shown by the principal component time series EOF, is much stronger in Banda than in Seram at -2.7. A decreasing trend of seawater temperature was also found in 2015.
Vertical Characteristic of Water Mass in The Flores Sea: The Effect of The ITF on The Transitional Season
Authors: Wahyuni D S , Kisnarti E A , Permatasari I N , Adrianto D 
Published: June 2024

Abstract
Indonesian Through Flow (ITF) forms unique water mass characteristics in Indonesian Marine Waters. This water mass enters through the Makassar Strait into the Banda Sea by crossing the Flores Sea. This study aims to analyse the characteristics of water masses in the Flores Sea during the transition season. In situ data was obtained using conductivity temperature depth (CTD) at four stations in the Flores Sea from April to May 2023. Next, the data was processed and analysed for layer thickness through vertical stratification and water mass characteristics using T-S diagrams. The analysis results show that the thickness of the homogeneous layer in the Flores Sea in the first transition season is between a depth of 0-40 m, the thermocline layer is at a depth of 40-300 m, and the depth layer is from a depth of 400-900 m. Apart from that, the characteristics of the water mass identified through the T-S diagram are: North Pacific Subtropical Water (NPSW) is found at a depth of 100-150 m with a temperature between 20-26° C and a salinity between 34.9-35.4 psu. Another water mass is South Pacific Intermediate Water (SPIW) at a depth of 500-800 m with a temperature of 6-8° C and a salinity of 34.55-34.65 psu. In contrast, the Antarctic Intermediate Water (AAIW) was found at a depth of >750 m with a temperature of 5-6° C and a salinity of 34.5-34.6 psu.
Seagrass blue carbon stocks and air-sea CO2 fluxes in seagrass meadows Jepara, Indonesia
Authors: Latifah N , Ningsih N S , Kartadikaria A R , Wirasatriya A 
Published: June 2024

Abstract
This research was conducted on August 2022 (east season) and February 2023 (west season) in Jepara waters. There are four types of seagrasses found: Ea (Enhalus acoroides), Cr (Cymodocea rotundata), Os (Oceana serrulata), and Th (Thalassia hemprichii). The analysis results suggest that the Os species has the largest organic carbon stock within seagrass (OCS-Sg), whereas Ea has the lowest. Aside from morphological measures, in this study seagrass shoot density also determined OCS-Sg for each type of seagrass. This study found that OCS-Sg is higher during the east season (26.2±2.81 gCorg m−2) than the west season (11.2±1.78 gCorg m−2). Whereas, organic carbon stock within sediment (OCS-S) is lower during the east season (41.5±0.9 gCorg m−2) and higher during the west season (56.3±0.9 gCorg m−2). During the east and west seasons, Jepara waters act as a CO2 source. However, during the east and west seasons vegetated OCS-S had higher carbon storage (41.9 and 57.2 gCorg m−2) than unvegetated (39.2 and 53.7 gCorg m−2). This is also indicated by the CO2 flux in vegetated which is lower (13.1±4.8 mmol CO2 m−2 d−1) than unvegetated (16.5±4.7 mmol CO2 m−2 d−1) during the east season. On the other hand, vegetated waters have higher CO2 flux (22.7±2.7 mmol CO2 m−2 d−1) in the west season than unvegetated (18.0±2.5 mmol CO2 m−2 d−1), this is related to seagrass shoot density during the west season which is decreasing. These findings lead to the conclusion that seagrass plays an important role for storing and absorbing carbon and storing carbon and store it in seagrass biomass and sediment even though the role of waters returns CO2 back to the atmosphere.
Tidal range energy conversion from Benoa, Bali
Authors: Zahra A N Az , Kartika A G D , Rachman H A 
Published: June 2024

Abstract
As one of the oceanographic parameters, the tidal range can be used as a source of blue energy in producing renewable energy such as electricity in Indonesian territory, especially in small islands. Utilization of tidal ranges in producing electrical energy will be more environmentally friendly when compared to Steam-Electric Power Station, which require coal resources as a power source. This research aims to determine the potential for renewable energy from tides in Benoa waters, Bali. The data used in this study is sea level data from tide gauges sourced from the University of Hawaii Sea Level Center (UHSLC). Analysis of tidal types and components in this study was carried out using the least squares method using the R program language. The results showed that the tidal type of Benoa waters is a mixed-semidiurnal tide. In 2020 and 2022, the highest tidal ranges are 2.46m (in December) and 2.3m (in March, November, and December), respectively. The simulation results for a 1000 m2 pond show that the energy potential in 2020 is 24.0 kWh and in 2022 it is 27.7 kWh. The tidal value’s magnitude influences the tidal energy potential; the more significant the tidal value, the greater the energy produced.
Abundance of Marine Debris on Satonda Island, West Nusa Tenggara, Indonesia
Authors: Kisnarti E. A. , Mevia S. K. A. 
Published: June 2024

Abstract
Macro-sized marine debris is found not only on the coasts of densely populated islands but also on the coasts of small islands. The presence of marine debris on this small island is because there are tourist attractions that attract people’s attention or because currents around it carry it away. Therefore, this research aims to determine the abundance of marine debris on Satonda Island (a small island in the eastern part of Sumbawa Island, West Nusa Tenggara Province, Indonesia). Even though it is small, this island is an attractive tourist destination because it has a lake formed from the eruption of Mount Tambora. Marine debris data was collected using the quadrant transect method, carried out randomly along the coastline. Data collection time was carried out at high and low tides, with the parameters recorded being the amount and type of waste, size and shape of rubbish, coordinate points, transect length, and data collection time. The research results show that the marine debris on Satonda Island is diverse (393 items), with a total weight of 16,665.45 g. At high tide, it is dominated by rubber marine debris, such as shoes and sandals weighing 1,457 g (33 items), while at low tide, it is dominated by hard plastic marine debris weighing 3,972 g (147 items).
Analysis of extreme wave probabilistic return value based on the 20-year spectral and empirical wave modeling approach in the Coastal Area of Pangandaran
Authors: Musa M F F , Windupranata W , Nusantara C A D S , Nuraghnia A , Al Ghifari M W , Hayatiningsih I , Wijaya D D 
Published: June 2024

Abstract
The coastal area of Pangandaran is located on the southern coast of Java Island, Indonesia. It offers stunning beach panoramas, and tempting waves for surfers, while also providing livelihoods for people who depend on the marine biodiversity and abundance of fish caught in the surrounding waters. However, its exposure to the Indian Ocean makes it susceptible to extreme waves, posing risks to tourism, fishing, and safety. This study aims to conduct an extreme wave hazard analysis based on the Probabilistic Return Value (PRV) using Significant Wave Height (SWH) data for over 20 years of data to obtain a wave climate value in the Batukaras area. The SWH values are obtained from two methods, numerical spectral wave modeling using Simulating Waves Nearshore (SWAN) and calculations using an empirical formula from the Joint North Sea Wave Project (JONSWAP), both using wind data from the ERA-5 Satellite. Based on these calculations, the Gumbel distribution was analysed to determine the PRV value on the coast. By estimating the return value of extreme waves based on the spectral SWAN method, for a return period of 300 years, extreme wave events occur at a height of 2.01 m to 2.64 m at a depth of 5-21 m. Meanwhile, the empirical JONSWAP method generates the same probability for wave heights of 7.19 m to 12.81 m based on statistical predictions based on modeling data. Based on these results, community and tourist preparedness on the coast of Batukaras Village is expected to increase, particularly during bad weather.
The application of a low-cost microcomputer logger with pressure-temperature based sensor for coastal observations: A preliminary study
Authors: Batubara M , Risandi J , Sufyan A , Pamungkas A , Wardhani K S , Hendriyono W , Husrin S , Ulumuddin Y , Hidayat R , Handrio  , Ulvan A , Muhajirin  , Alfahmi F 
Published: June 2024

Abstract
Nearshore hydrodynamics, such as water level fluctuations, field observations play a crucial role in understanding and monitoring the dynamics of the coastal region. The observed parameters provide insight into oceanographic processes, climate change impacts, and the behavior of marine ecosystems that could be valuable for coastal management and infrastructure development planning. Most of the available hydrodynamic loggers are provided by companies with relatively high prices. Due to limited budgets, many areas including Indonesia waters, have limited hydrodynamic observation data. In this paper, we presented a prototype of a simple (DIY-Do It Yourself) and low-cost water level logger with a microcomputer that could be applied in coastal regions. The system consists of a pressure-based sensor to detect water level fluctuations, a temperature sensor, a single-board microcomputer and data logger, and a power supply with different sampling frequencies for various coastal applications. The result showed the ability of the microcomputer system to measure high-resolution water levels and temperatures applicable for non-directional waves, tides and non-tides observations, and ecological monitoring. The microcomputer’s low power consumption makes it suitable for long-term coastal observations, even in remote or battery-powered applications. The body of the logger is designed from PVC-nylon with sensors made from waterproof and corrosion-free materials to ensure its applicability for coastal monitoring. Moreover, the flexibility of the microcomputer system allows for customization and adaptation to specific research requirements at relatively affordable prices.
Evaluation of Sea Surface Temperature from the Satellite Observations and Model Output using In Situ Measurement dataset: Study area Panjang Island, Banten
Authors: Kartadimaja Z , Rachmayani R , Cahyarini S Y 
Published: June 2024

Abstract
Sea surface temperature (SST) is a crucial parameter in climate change studies, and it can be obtained from various sources, including in-situ measurements, satellite observations, reanalysis, and models. However, due to the limited availability of in-situ data, researchers often rely on satellite observations and models, all of which are susceptible to errors. This study aims to improve the accuracy of SST data from satellite observations and models by evaluating and calibration the data through comparison with in-situ SST data using time series analysis. The study areas are Panjang Island, Banten, with a period from April 15, 2022, to February 7, 2023. The data was collected from satellite (OISST V2.1), model (Hycom GOFS V3.0-3.1), and in-situ (loggers HOBO U-24 and TidBit V2.1). The results show that satellite-derived SST values perform better than the model based on higher satellite correlation coefficient values (r = 0.853) compared to the model (r = 0.685). In addition, satellite data also have lower error rate (

x
¯

b
i
a
s

= 0.445°C; σ
bias
= 0.304°C; RMSE = 0.538°C) than model (

x
¯

b
i
a
s

= 0.472°C; σ
bias
= 0.32°C; RMSE = 0.57°C). The variance tests show no significant difference for satellite (p-value = 0.785) and model (p-value = 0.346) data against in-situ data, while the mean tests reveal disparities (p-value < 0.001). The calibration process reduces error values for both satellite (

x
¯

b
i
a
s

= 0.276°C; σ
bias
= 0.225°C; RMSE = 0.356°C) and model data (

x
¯

b
i
a
s

= 0.398°C; σ
bias
= 0.298°C; RMSE = 0.397°C), but the correlation coefficients remain stable at 0.853 (satellite) and 0.685 (model). In conclusion, satellite observations provide a more precise picture of the SST conditions on Panjang Island, Banten and the calibration process can improve the quality of satellite model data.
True Wind Direction and Speed Measurements System on the Ship with 433 MHz Radio Telemetry
Authors: Lisnawati A E , Winata N , Putra S R , Ariyandy T A , Susanto A T 
Published: June 2024

Abstract
A group of air masses that travel across the difference in air pressure is called the wind. The actual wind speed and direction, independent of the ship’s speed and direction, is known as the true wind. It is a necessary component for maritime transportation safety. The research aims to establish the effectiveness of the true wind direction and speed measurements system. The system will make the ship captain easier for monitoring the true wind data without having to analyze the apparent wind data. This system uses two primary sensors, such as GPS and an anemometer. The GPS Ublox Neo M8N generates the ship’s speed and the coordinate data in latitude and longitude, while the anemometer delivers the signal as the apparent wind data. All data will be automatically measured using an algorithm to obtain the true wind data. This measurement will be processed by the Arduino mega 2560 as a microcontroller that additionally also needs an RTC to generate the time data. The output data, such as time, coordinates, and true wind speed and direction, are recorded on the SD card and displayed on LCD. In addition, the true wind data is also sent from transmitter to receiver through a 433 MHz 3DR telemetry communication and displayed on the user interface as real-time data. The conclusion is that system is truly efficient and effective for knowing the real-time true wind data, and the communication distance can achieve roughly 87.02 meters.
Assessment of suspended sediment particles distribution pattern by using remote sensing approach and in-situ data to support coastal protection in Barito River mouth area, Indonesia
Authors: Widyanata D , Dewi I P , Rahmania R , Baharuddin  
Published: June 2024

Abstract
With a total length of approximately 900 km, Barito River has become an important water transportation route in South Kalimantan Province of Indonesia for hundreds of years, by connecting major city such as Banjarmasin and other outback regions in its upstream with the Java Sea. This river is also known as mouth to other river branches such as Martapura, Kuin, Nagara and Tapin River. Unfortunately, the natural condition of Barito is degraded due to anthropogenic disturbances in the upstream. Intensified land clearing activities has caused a high volume of runoff and discharge, especially during the rainy season with a high intensity of rainfall, thus increasing the total suspended solids in waters surround the river mouth. On the contrary, the low intensity of rainfall during the dry season leads to a lower volume of runoff and discharge. This study aims to visualize the distribution pattern of Total Suspended Solids (TSS) in the coastal waters surround Barito River mouth during both rainy and dry seasons, which resulted from field observation (started from river body to the coastal waters) and Sentinel-2 image analysis. The result indicates a similar trend between satellite image analysis and in-situ measurement, where a high concentration of TSS is occurred during the rainy season and lower concentrations of TSS during dry seasons. From field observation, the concentrations of TSS ranges from 12 mg/l to 46 mg/l during the rainy season and from 1 mg/l to 65 mg/l during the dry season. From Sentinel-2 analysis, the concentrations of TSS ranges from 30 mg/l to 170 mg/l during the rainy season and from 5 mg/l to 50 mg/l during the dry season. During the rainy season, the concentration is high and distributed further towards the coastal waters due to the influence of high discharge and rainfall. While during the dry season, the concentration is lower and primarily distributed in the estuarine area due to the influence of discharge and tidal currents, both of which are equally significant. This study can be used by local government as a tool to control land use change in the upstream, protect coastal area and to mitigate the impact of natural disaster that could be caused by this event in the downstream.
Primary Productivity Variation in Banten Bay and Java Sea and Its Relationship with Fish Catches
Authors: Giantara M I F , Nurdjaman S 
Published: June 2024

Abstract
Ecosystems carry out internal activities, one of which is by carrying out production which is the process of inputting and storing energy from sunlight as a primary energy source called primary productivity. The development of wider coastal areas is a major factor in the importance of assessing the quality of water fertility as a measure of ecosystem change. The aim of this research is to predict the value of primary productivity in Banten Bay and the Java Sea seasonally from 2005-2020 based on MODIS Fluorescence satellite image data and processed using the Vertically Generalized Production Model (VGPM). Net Primary Productivity results obtained in Banten Bay in the West Season 148.23 mgC.m−3.d−1; Transitional Season I 148.06 mgC.m−3.d−1. East Season with 154.05 mgC.m−3.d−1; Transitional Season II 170.10 mgC.m−3.d−1 while in the Java Sea in the West Season 100.05 mgC.m−3.d−1; Transitional Season I 82.20 mgC.m−3.d−1; East Season 110.84 mgC.m−3.d−1; Transitional Season II 95.97 mgC.m−3.d−1 which decreased in value from 2005 to 2020 in both regions. Water fertility in Banten Bay and the Java Sea is higher in the nearshore area than the open sea which is influenced by chlorophyll-a, PAR availability, day length, temperature, maximum carbon fixation, euphotic zone depth, and area. Trophic status in each season in Banten Bay is included in the Oligotrophic class while in the Java Sea it is included in the Oligotrophic and Mesotrophic classes. NPP has a positive correlation with the overall capture of small pelagic fish species of 0.654 (average).
Van der Waals epitaxial growth of few layers WSe2 on GaP(111)B
Authors: Chapuis Niels , Mahmoudi Aymen , Coinon Christophe , Troadec David , Vignaud Dominique , Patriarche Gilles , Roussel Pascal , Ouerghi Abdelkarim , Oehler Fabrice , Wallart Xavier 
Published: June 2024

Abstract
2D material epitaxy offers the promise of new 2D/2D and 2D/3D heterostructures with their own specific electronic and optical properties. In this work, we demonstrate the epitaxial growth of few layers WSe2 on GaP(111)B by molecular beam epitaxy. Using a combination of experimental techniques, we emphasize the role of the growth temperature and of a subsequent annealing of the grown layers under a selenium flux on the polytype formed and on its structural and morphological properties. We show that a low growth temperature promotes the formation of the 1T′ and 3R phases depending on the layer thickness whereas a higher growth temperature favours the stable 2H phase. The resulting layers exhibit clear epitaxial relationships with the GaP(111)B substrate with an optimum grain disorientation and mean size of 1.1° and around 30 nm respectively for the 2H phase. Bilayer 2H WSe2/GaP(111)B heterostructures exhibit a staggered type II band alignment and p-doped character of the epi-layer on both p and n-type GaP substrates. This first realisation of stable p-type WSe2 epi-layer on a large-area GaP(111)B substrate paves the way to new 2D/3D heterostructures with great interests in nanoelectronic and optoelectronic applications, especially in the development of new 2D-material p-n junctions.