bluuebunny/crossref_metadata_2025_split huggingface dataset:
Virtual impedance optimization control strategy for wind turbine grid-forming converters in weak grid
Authors: Zhuang Shenglun , Kong Xiangmei , Sun Sujuan 
Published: October 2024

Abstract
Grid forming(GFM) technology is key to the effective consumption and grid-friendly integration of large-scale wind power. However, as the new type of power system sees a high penetration of new energy sources and a decrease in circuit capacity, leading to systems exhibiting weak grid characteristics, this paper studies the adaptive characteristics of grid-forming wind turbine converters under weak grid conditions. It investigates the dynamic relationship between power coupling characteristics and the system impedance ratio based on the virtual impedance method and proposes an impedance optimization method to improve the power decoupling accuracy and dynamic response capability of grid-forming converters. The research results show that the grid-forming controller can operate stably under weak grid conditions, an increase in grid impedance ratio leads to stronger power coupling intensity, and the voltage support capability of grid-forming converters weakens. The simulation verifies that the virtual impedance optimization strategy proposed in this paper can effectively improve the power coupling characteristics of the grid-forming converter and enhance the converter’s dynamic response performance under weak grid conditions.
Real-time voltage control of centralized and distributed coordination in active distribution network under multiple coupling
Authors: Dou Wenlei , Tong Yongji , Song Zhuoran , Zhang Mingli , Lu Sichen , Zhu Hongbo 
Published: October 2024

Abstract
At present, the “source-load interaction” distribution network operation mode has gradually replaced the “source-load operation” mode. The uncertainty and volatility of the distribution system have been enhanced, the controllability has been weakened, the voltage fluctuations have been frequent, and the power quality has been decreased. Voltage regulation is crucial to fully absorbing new energy generation and improving the operation safety of the active distribution network. To solve the problem of real-time control of distribution networks, this paper proposes a distributed voltage control method of active distribution networks with global sensitivity, establishes a distributed communication mechanism, and builds a distributed forward push-back communication rule to transfer power and voltage information between nodes. The global sensitivity of voltage, active power, and reactive power is used for real-time, independent, and effective control of multiple devices at each node, and the distributed control process is simulated according to actual production conditions. Furthermore, the centralized and decentralized real-time voltage control methods are proposed, and the centralized and distributed methods are implemented in medium voltage primary distribution network (MVPN) and low voltage secondary distribution network (LVSN), respectively, to play the advantages of high computing efficiency and fast control response. Based on model predictive control (MPC), intra-day rolling time scale voltage regulation is constructed, and second-level control is used to adapt the MPC results, finally promoting the optimal scheduling and rapid response of various controllable flexible resources in the multi-level active distribution network.
Harmonic characteristics analysis and power quality requirements of Light-Emitting Diode lamps used in nuclear power plant lighting system
Authors: Lu Jinjun , Jiang Geling 
Published: October 2024

Abstract
This article conducts an in-depth study of the application of LED (Light-Emitting Diode) lamps in nuclear power plant lighting systems and conducts a comprehensive analysis of its impact on the power quality of the plant’s low-voltage AC power system. First of all, through a detailed discussion of the harmonic characteristics of LED lamps and the power quality requirements of nuclear power plants, it is pointed out that the harmonics of LED lamp drivers will inevitably have an impact on the power quality of low-voltage AC power systems. Therefore, the harmonic characteristics of LED lamps must comply with certain constraints. Subsequently, the application of LED lamps under different capacity transformers was analyzed and combined with relevant standards and specifications, and application suggestions for LED lamps in nuclear power plant lighting systems were put forward. Finally, measures to improve the total harmonic distortion rate of LED lamp current were discussed, emphasizing the importance of power factor correction technology. In summary, this article provides important reference and guidance for the application of LED lamps in nuclear power plants, helping to ensure the safe and stable operation of nuclear power plants.
Developing the blue and circular economy through visionary eco-leadership in the fish waste processing agro-industry
Authors: Irawan NC , Widodo ZD 
Published: October 2024

AbstractSignificant environmental pollution is caused by fish scale waste, but its utilization is still limited, so it has the potential to cause food waste which is detrimental to the environment. Eco-leadership is essential in changing people’s behavior by teaching them to see waste scales as a source of value-added materials, creating a sustainable economy, and improving the quality of the surrounding environment. This study explores the relationship between visionary eco-leadership from employee perceptions and its influence on developing a blue and circular economy in the fish waste processing agro-industry. This study used a purposive location determination method with a population of employees of an agro-industrial fish waste processing company in Boyolali Regency and a sample of 60. Data analysis used structural equations and the Partial Least Square (PLS) method. This study concludes that visionary leaders who care about the environment in the fish waste processing agro-industry positively and significantly influence the development of a blue and circular economy.
Effect of supplement addition on fitness media on the physiological condition and survival of transport freshwater crablets (Parathelphusa convexa De Man, 1879)
Authors: Chofifakh U , Sulistiono S , Affandi R , Wildan DM , Widigdo B , Ervinia A 
Published: October 2024

Abstract
The population of freshwater crablets in nature has decreased due to a decrease in: the area of rice fields, discharge, and water quality. Domestication, pollution control, and catching freshwater crablets are important to maintain their sustainability. One effort to reduce the rate of exploitation is to save on the use of seeds in cultivation activities, especially by reducing mortality during transportation and initial post-transportation maintenance. This study aims to analyze the effect of adding supplements to the growing media before and after transportation on the physiological condition, survival and condition factors of freshwater crablets (P. convexa). This research was conducted from March to May 2023 at the Aquatic Animal Physiology Laboratory. This study used a completely randomized design (CRD) with one dose of the best supplement (10 ppm) and 10 replicates. The study used analysis of variance (ANOVA) test for each parameter measured least and significant difference (LSD) test with 95% confidence interval. Freshwater crablets were given four treatments, namely A: (TS-TS), B: (TS-DS), C:(DS-DS), and D: (DS-TS). The results showed that application of supplements with a dose of 10 ppm in the fermentation media before and after transportation (treatment C: DS-DS) was the best with blood glucose levels of 30.50 mg/dL and survival of 70%. The condition factor values of freshwater crablets in the four treatments tended to decrease at the end of the observation.
Growth patterns and condition factors of introduced crayfish population in Rawa Aopa-Watumohai National Park
Authors: Nur A I , Ariyatni N , Ketjulan R , Kamri S 
Published: October 2024

Abstract
Crayfish as an introduced species is now the primary catch of fishermen in the marsh ecosystems of Rawa Aopa-Watumohai National Park. Despite its significant economic impact on the area, caution is advised due to this species’ high ability to infiltrate a new ecosystem as a competitor, predator, pathogen, or parasite carrier. However, preliminary research is necessary to determine its basic biological elements, such as growth patterns and condition factors, as there is currently no information available for the ecosystem. A simple random sampling technique was used with 24 traps at 3 sites to catch the 810 total crayfish. The analysis results showed that the carapace length range was 19.5-99.4 mm predominantly by middle-size crayfish (44.4-60.9 mm). Based on the length-weight relationship by sex and month, the growth pattern was found negatively allometric (b:1.59-2.31) with strong correlations between length and weight (>0.9) indicating that the crayfish was thin. The result of the condition factor analysis by sex and month also showed that the crayfish was not plump (K:1.01–1.07). The crayfish’s body in the national park was shorter, thin, underweight, or generally unhealthy compared to crayfish from other areas of Indonesia. These results suggested that the population was likely suppressed by natural or human-related factors, necessitating a further study of the species’ other biological aspects.
Mapping the habitat distribution of horseshoe crabs (Tachypleus gigas) in Pamekasan, Madura Island, Indonesia
Authors: Ramadhan F , Maulana P , Darmawan D 
Published: October 2024

Abstract
Horseshoe crabs, often known as Belangkas or Mimi, is one of the ancient marine faunas with protected conservation status. Horseshoe crabs are distributed in coastal waters of Indonesia of the islands of Sumatra, Java, Kalimantan, and Sulawesi, which are often caught as bycatch. Horseshoe crabs’s bloods were uniquewhich contain amebocytes as a test material for the presence of endotoxin bacteria. The purpose of this study was to identify the species of horseshoe crabs and to analyze environmental conditions, as well as the distribution of horseshoe crabs in the coastal waters of Pamekasan, Madura Island. This study was conducted in June 2023 by collecting data from crab fishers. ArcGIS was applied to delineate the distribution of horseshoe crab. The identification results showed that there was one species horseshoe crab of the Tachypleus gigas in the waters of Polagan Village, Galis District, Pamekasan Regency. The environmental condition of the waters in Polagan Village, Galis District, and Pamekasan Regency was relatively good. Habitat mapping is one way to protect these animals from the threat of extinction and support conservation efforts.
Susceptibility analysis of cuttlefish (Sepia recurvirostra) to blue swimming crab fisheries in Keboromo village, Pati
Authors: Rizal ES , Mustabiq K , Satria MB 
Published: October 2024

Abstract
The coast of Pati Regency and its surroundings are one of the crab sanctuaries on the north coast of Java that have tended to increase in the last decade. The purpose of this study was to analyze the level of vulnerability of cuttlefish (Sepia recurvirostra) to crab fisheries in Keboromo Village, Pati. The sample used was the catch of cuttlefish by blue-swimming crab fishermen in Keboromo Village during the research period of June 2023. The productivity value was obtained from the literature, while the parameters of vulnerability were obtained from interviews with local fishermen, which were analyzed using productivity and susceptibility analysis (PSA). The average length of the cuttlefish was 80–125 mm, with a weight of 25–61.6 grams. While having a PSA score of 1.71 with an MSC score of 84.7 (limit > 80). The smaller PSA value indicates the level of vulnerability is still relatively low, so fishing activity pressure has not had a serious impact on the potential sustainability of cuttlefish.
Distance of fishing ground against blue swimming crab (Portunus pelagicus) catches using a gillnet in Gresik, East Java, Indonesia
Authors: Maulana P , Ramadhan F , Maulydya FYD 
Published: October 2024

Abstract
Information on fishing grounds is crucial in efforts to manage blue swimming crab capture fisheries. The further away the fishing location, the higher cost risk. The purpose of this study is to determine differences in catches and biological characteristics of crabs caught by the crab fishermen using gillnets on 0–2 miles and 5-7 miles from November 2022 to January 2023 in the waters of Mengare Island, Bungah District, Gresik Regency, East Java Province. Descriptive analysis and multivariate analysis of variance (MANOVA) were used to explain the biological characteristics of the blue swimming crabs and differences in the effect of fishing ground distance on crab catches. The results showed that the total yield of 2478 female crabs and 4360 male crabs with details at a distance of 0–2 miles was 1701 males and 925 females, while at a distance of 5-7 miles, there were 2659 males and 1553 females. Most crabs with mature level were found at 0–2 miles and 5-7 miles. The distance to the fishing ground affects the average width, average weight, and number of male crabs. Distance and fishing ground differences can affect the diversity of crab biological characteristics.
Catch composition and fishing season of blue swimming crab using a collapsible trap in Pemalang coastal water, Central Java
Authors: Arofah N , Sari MP , Ervinia A 
Published: October 2024

Abstract
The blue swimming crab (Portunus pelagicus) is an economically important fishery resources that has penetrated the export market that requires proper management. Pemalang Regency is still entirely dependent on natural catches, so information on seasonal patterns of blue swimming crab fishing is essential for fishermen to support the efficiency and effectiveness of the fishing activity. This research was conducted in Danasari village, Pemalang sub-district, in January–December 2022 with the aim of determining the composition of collapsible trap catches based on the crab fishing season in the waters of Pemalang Regency. Danasari fishermen classify the blue swimming crab fishing season into two, the west season starts in November–May (high rainfall), and the east season starts in June–October (low rainfall). The survey method was performed by collecting data of blue swimming crab catch as the main target and bycatch. Carapace width of the blue swimming crab was also measured. The data obtained was analyzed descriptively using Microsoft Excel 2010 software. The results showed that the catch composition of collapsible traps in Pemalang consisted of crustaceans, fish, and mollusks. The best season to catch blue swimming crabs was during the west season because the catch is more stable than during the east season.
The impact of construction of an integrated shell waste management site on social, economic, and environmental aspects in Cirebon, West Java
Authors: Sari M P , Arofah N , Satria M B , Nugraha B A 
Published: October 2024

Abstract
The concept of a blue economy encourages business growth and efficient investment while protecting the environment by making the most of spending and financing resources that will increase economic growth and improve people’s lives. Crab shell is one of the industrial wastes of the pasteurization of crab meat, which is growing along with the demand for exports. Direct stockpiling of crab shells creates an unpleasant odor and makes access difficult for collectors of crab shells. Therefore an Integrated Shell Waste Treatment Site (ISWTS) is very important to build to support the blue economy principle, where all economic operations are zero-waste, clean, and efficient. The purpose of the study is to examine the impacts of ISWTS development on the social, economic, and environmental aspects in the Cirebon Regency. Data was collected through focus group discussions and interviews with eight miniplant owners and one supplier of crab shells. Qualitative descriptive and triangulation were applied to analyze the increase in earnings in crab industry laborers, the impact of individual and group capabilities, the strength of partnership partners, and labor absorption. The result shows there is an increase in earnings, which can contribute to the fisheries sector to the Gross Regional Domestic Product (PDRB) in Cirebon Regency through the application of the website for making orders operated by laborers and customers. This business makes more strong connections among miniplants, dryer shells, and TPLCT side through labor absorption primarily to involved and utilize at TPLCTThe study findings show that the community supports the construction of the TPLCT because it employs many people, but the building must be carried out far from residential areas.
Multi scale analysis of social-ecological system of lobster (Panulirus spp.) fisheries in the Gunungkidul waters, Yogyakarta
Authors: Nugraha E C P , Adrianto L , Krisanti M , Effendi H , Yulianto G 
Published: October 2024

Abstract
Lobster is a high-value fisheries commodity in Gunungkidul Regency. Lobster resource management in the waters of Gunungkidul Regency has not been well identified in the social-ecological system (SES) framework. This study aims to describe and analyze the dynamics of interrelationships between the social-ecological system components of lobster fisheries in Gunungkidul Regency, which consists of the subsystem of resource systems (RS), resource units (RU), resource actors (RA), and resource governance (RG) and their interrelationships within and between subsystems to formulate a sustainable lobster management strategies in the waters of Gunungkidul Regency. This research was conducted from November 2022 until January 2023. The results of this study have indicated a dynamic interaction between the SES components of lobster fisheries. RS and RA are the SES components with the highest influence, so the slightest changes in RS and RA can cause co-evolutive changes to all the SES components of lobster fisheries in the waters of Gunungkidul Regency.
Mud crab (Scylla spp) resources status in Hoat Sorbay Bay, Southeast Maluku Regency
Authors: Abrahamsz J , Makailipessy M M , Thenu I M , Ingratubun M A 
Published: October 2024

Abstract
Ohoi Evu is one of the villages in Southeast Maluku Regency where fishermen utilize mud crab resources. Mud crab fishing areas are concentrated in the waters of Hoat Sorbay Bay. Information on mud crab fisheries in these waters is relatively limited, so the application of sustainable management efforts is still difficult to develop. This study aims to determine the status of mud crab resources through the adoption of a fishery management model with an ecosystem approach and formulate recommendations for improving its management. Data collection was carried out through surveys of fishing operations, interviews, and participatory mapping. This research was conducted for 13 months, starting from January 2021 to January 2022, at Hoat Sorbay Bay. The research focus is on the Wear Manun Joint Business Group (KUB) in Ohoi Evu. The indicators observed included CPUE, mud crab size trends, the proportion of juveniles caught, species composition, range collapse, and endangered, threatened, and protected (ETP) species caught. Descriptive statistical analysis, CPUE, and indicator analysis were carried out using a multi-criteria analysis approach through the assessment of composite indexes and flag model visualization. The results showed that the management status of the mud crab fishermen Ohoi Evu in Hoat Sorbay Bay was in the moderate category (yellow) with a composite value of 2.50. CPUE indicators and species composition were good categories with a score of 3 (green). Trend indicators for fish size, proportion of juveniles, ETP species, and range collapse are in the moderate category with a score of 2 (yellow).
The exploitation status and spawning potential ratio of blue swimming crab (Portunus pelagicus) in North Natuna Sea, Indonesia
Authors: Fauzi M , Pane A R P , Taufik M , Widyastuti H , Mardlijah S , Hufiadi H , Yusuf H N , Prihatiningsih P , Noegroho T , Chodrijah U 
Published: October 2024

Abstract
Blue Swimming Crab (BSC) has been exploited in various areas, including the North Natuna Sea, because of its high selling value and potential as an export commodity. Overexploitation can threaten its sustainability. Therefore, information is needed regarding population status and spawning potential, particularly in the North Natuna Sea. This research was performed over three years, from April to December 2018, February to November 2019, and March to December 2020. A total of 4960 individuals of BSC samples ranged in size from 60 to 160 mm, with 115 mm being the most dominant. BSC exploitation in this water has reached E = 0.6, indicating that it has been overfished. The SPR value obtained was 19 percent. Even though there is high fishing pressure, the spawning potential of crabs is relatively high. Appropriate management policies are needed to maintain their spawning potential, including limiting the catchable size to a minimum of 60 grams and a policy of closing spawning locations.
Determining demersal fisheries status in fisheries management arena (FMA) 712 under data limited situation
Authors: Natsir M , Adnina G S N , Rizal D R , Agustina S , Darmono O P , Hartati I D. , Rosdiana A , Retnoningtyas H , Yulianto I 
Published: October 2024

Abstract
Demersal fisheries in FMA 712 have been established since the early 1950’s, industrialization in demersal fisheries was started on 1970’s with the operation of trawl fleets in Java Sea. The exploitation continued until the 1980s when the Trawl Ban regulation was enacted. According to historical statical data from 1980 the number of demersal fishing fleets are still dominating and endangered the sustainability of demersal fish stock in FMA 712. This study presented alternatives approaches to determining demersal fisheries status in FMA 712 using the Bayesian surplus production model (cMSY) and Length-Based Spawning Potential Ratio (LBSPR). The cMSY analysis was conducted using time series production data and known CPUE represent the area in FMA 712 and the LBSPR model was conducted using the life-history parameters and the length frequency data. The results show that current demersal fisheries condition is overexploited, points of estimation of the Biomass condition based on 1980-2022 data: B/BMSY 0,803, F/FMSY 1,75 and MSY 323.000 ton. Additionally, the spawning potential ratio (SPR) of the dominant demersal fish species (Lutjanus malabarius and Portunus pelagicus) was lower than the limit reference point (<0,20), indicating overexploited. This study demonstrates that alternatives approaches could be applied to limited data fisheries and provide useful and robust recommendations.