bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of flow controller for aviation electric fuel pump
Authors: Wenlong Zhang , Xiao Ding , Jianghong Li 
Published: May 2023

Abstract
In order to meet the demand of high-precision flow control and modular design of aviation electric fuel pump control system, the flow controller is analyzed and designed from the demand of aviation engines for electric fuel pump. Tests show that the steady-state control deviation of the controller is no more than 1% for mass flow rate, and the dynamic control deviation of mass flow rate is no more than 3% in the range of 50kg/h~2000kg/h. A flow controller with high integration degree, high control accuracy and excellent dynamic characteristics for new pump-control system was designed for aero engine.
Effect of flow distribution on shock vector nozzle vector performance
Authors: Shu B W , Huang J T , Gao Z H , He C J 
Published: May 2023

Abstract
For the dual-slot jet controlled two-dimensional shock vector nozzle, the effect of flow distribution on the vector performance of the nozzle is studied by RANS method, in which the total flow rate is unchanged. The results show that the flow distribution has no effect on the thrust coefficient. Increasing the downstream jet flow and reducing the upstream jet flow helps to improve the vector angle and vector efficiency, and the effect is obvious when there is separation and re-attachment between the two jets. Increasing the upstream jet flow and reducing the downstream jet flow will reduce the vector angle. The effect is not noticeable when the separation zone between the two jets is stable and no re-attachment. Maintaining a stable separation zone between dual-slot jet without re-attachment helps improve the vector performance of SVC nozzles. The dual-slot jet flow distribution should aim to eliminate reattachment of separation between jets.
Profitability of hybrid power plants in European markets
Authors: Habbou Hajar , Leon Juan Pablo Murcia , Das Kaushik 
Published: May 2023

Abstract
As markets continue to evolve, hybrid power plants (HPPs) are attracting the interest of plant operators and industry players alike. With their ability to provide flexible dispatchability, HPPs are poised to become a competitive solution in future energy markets, particularly in grid ancillary markets (such as frequency control, reactive power control and black-start). Moreover, resource complementarities present in some sites have the potential to significantly improve production predictability of collocated HPPs. To assess the profitability of HPPs in European markets, a hybrid sizing algorithm is applied to three locations across Europe with distinct resource distribution characteristics. The sizing tool implemented includes several novel features that are not typically incorporated into existing sizing software currently available on the market. This includes turbine selection, a simplified physical design of the wind power plant, a surrogate wake model, and a simplified solar panel degradation model. NPV-over-CAPEX optimal plant designs, tend to favor hybridization, by either collocating wind and solar power with storage, or only solar power with storage. On the hand, minimizing the levelized cost of energy generally results in single-technology power plants. The results show significant potential for hybrid power plants in European markets. However, to truly demonstrate their economic competitiveness, the focus should shift from LCOE to other optimization metrics that consider revenue from different electricity markets.
Economic impact assessment of Hydrogen generated from Offshore Wind: A case study for Belgium
Authors: Gaborieau Maëlig , Yilmaz Ozlem Ceyhan , Dykes Katherine 
Published: May 2023

Abstract
Green hydrogen is increasingly cited as a solution to the decarbonisation of industry. Its large-scale production is still a recent topic with uncertainties. In this paper, an economic impact assessment (EIA) method is explained. A modular and flexible cost model is generated, which estimates the LCOE (Levelized Cost of Energy) of an offshore wind farm and the LCOH (Levelized Cost of Hydrogen) of a hydrogen generation plant either as a hybrid renewable energy system (HRES) or independent from each other. The costs are estimated using a schedule-based approach, which considers the reliability, maintenance operations as well as production of both the offshore wind farm and the hydrogen generation plant. Developed EIA is demonstrated for Belgium using Mermaid Offshore Wind Farm.
Investigation of the dynamic inflow effects due to collective and individual pitch steps on a wind tunnel setup
Authors: Langidis A , Petrović V , Mancini S , Boorsma K , Schepers G , Kühn M 
Published: May 2023

Abstract
Dynamic inflow effects occur due to the rapid change of the rotor loading under conditions such as fast pitch steps. The paper presents a setup suitable for the investigation of those effects for non-axisymmetric rotor conditions, namely individual pitch steps. Furthermore, insights into the relevant phenomena are gathered. An individual pitch control capable model wind turbine is set up in a wind tunnel in order to conduct measurement under controllable conditions. During the execution of the collective and individual pitch steps, the loads and the operational parameters are recorded by the onboard sensors. Meanwhile, simulations engineering aeroelastic codes are run in order to evaluate their accuracy for predicting the relevant phenomena. Results show distinct behaviour of the rotor loads during an individual pitch step, which differs from the loads under collective steps. The free vortex wake simulations are able to predict the turbines’ response satisfactory while the blade element momentum tools show deviations from the measurements. The findings serve as a basis for discussion and future work.
Predictive maintenance of wind turbine’s main bearing using wind farm SCADA data and LSTM neural networks
Authors: Vidal Y , Puruncajas B , Castellani F , Tutivén C 
Published: May 2023

Abstract
Field failures of wind turbine main bearings cause unwanted downtime and significant maintenance costs. Currently, this industry seeks to increase its reliability, for which condition monitoring and predictive maintenance systems have been adopted. In most industrial wind farms, the integrated Supervisory Control and Data Acquisition (SCADA) system provides data that is stored averaged every 10 minutes that can be used to quantify the health of a wind turbine (WT). This research presents a framework for the analysis of data collected from the SCADA system of an operating wind farm, aiming to early detect the main bearing failure using a Long-Short-Term Memory (LSTM) neural network. For prediction, SCADA variables of the temperature of turbine components near the main bearing, rotor speed, ambient temperature, and generated power are taken into account. The results show that the proposed methodology can detect the target failure up to 4 months in advance of the fatal breakdown. The results obtained confirm the applicability of the proposed model in real scenarios that can help the operator with enough time to make more informed maintenance decisions.
Evolution of global snow drought characteristics from 1850 to 2100
Authors: Cowherd Marianne , Ruby Leung L , Girotto Manuela 
Published: May 2023

Abstract
Seasonal snow is an integral part of the global water supply and storage system. Snow droughts impact ecological, agricultural, and urban systems by altering the amount and timing of meltwater delivery. These droughts are characterized by a lack of on-the-ground snow (snow water equivalent, SWE) that can be caused by low total precipitation (dry drought) or low proportion of precipitation falling as snowfall (warm drought), often combined with an early melt. The standardized SWE index (SWEI) ranks the current status of SWE for a given location compared to a baseline condition and identifies the existence, but not the cause, of snow drought. In this work, we use estimates of SWE, temperature, and precipitation from nine coupled model intercomparison project phase 6 (CMIP6) models to quantify the frequency, severity, and type of snow droughts globally for historical and future scenarios. Compared to a historical baseline (1850–1900) total snow drought frequency more than doubles under socio-economic pathway (SSP)2-4.5 and SSP5-8.5; all of the increase in snow drought frequency comes from an increase in warm droughts. The probability distribution of future SWEI in major snowy basins around the world are likely to be centered on more negative values, which corresponds to more severe drought and, with only moderate changes in distribution spread, more frequent drought. CMIP6 simulations pinpoint snow drought as an emerging global threat to water resources and highlight the need to explore higher resolution future models that better capture complex mountain topography, wildland fires, and snow-forest interactions.
Singular relaxation of a random walk in a box with a Metropolis Monte Carlo dynamics
Authors: Chepelianskii Alexei D , Majumdar Satya N , Schawe Hendrik , Trizac Emmanuel 
Published: May 2023

Abstract
We study analytically the relaxation eigenmodes of a simple Monte Carlo algorithm, corresponding to a particle in a box which moves by uniform random jumps. Moves outside of the box are rejected. At long times, the system approaches the equilibrium probability density, which is uniform inside the box. We show that the relaxation towards this equilibrium is unusual: for a jump length comparable to the size of the box, the number of relaxation eigenmodes can be surprisingly small, one or two. We provide a complete analytic description of the transition between these two regimes. When only a single relaxation eigenmode is present, a suitable choice of the symmetry of the initial conditions gives a localizing decay to equilibrium. In this case, the deviation from equilibrium concentrates at the edges of the box where the rejection probability is maximal. Finally, in addition to the relaxation analysis of the Master equation, we also describe the full eigen-spectrum of the Master equation including its sub-leading eigen-modes.
Land suitability study for sweet sorghum (Sorghum bicolor (L.) Moench) farming in Pleret Yogyakarta
Authors: Nurcholis Mohammad , Isdiyanto Rochman , Krismawan Henri , Satria Firman Agung 
Published: May 2023

Abstract
Marginal land and geological disaster-prone in the Opak Fault zone area need to be studied for the basic potential for the development of multi-purpose crops for food, feed, and renewable energy. The study was aimed to determine the potential of the soil and evaluate the suitability of the land for sweet sorghum (Shorgum bicolor) crop in Gunung Kelir, Pleret District, Bantul, Yogyakarta as part of the Opak Fault line. A total of 20 sample points were collected based on geological data, land use, slope, and administrative maps. Analysis of soil physical and chemical properties was carried out to classify soil types and land suitability for sweet sorghum plants. The developing soils in the study area were originated from volcanic breccias, Young Merapi Volcano, and the alluvial of the Opak River, with included in orders of Entisols and Inceptisols. The cation exchange capacity of soils that develop from volcanic breccias is higher than those that develop from Merapi volcanic soils. Suitability of land for sweet sorghum plants includes S2 class with limiting factors for nutrient retention, temperature, and erosion hazard area of ± 24,011 Ha (76.23%), S3 class with limiting factors for erosion hazard and surface stonies of ± 3.85 Ha (12.22%), and N class with a root zone constraint of ± 0.139 Ha (0.44%), and others are not agriculture. Based on the results of this study it is expected that sweet sorghum is able to be developed in the Opak Fault zone to enhance the use of marginal land.
Hydraulic performance of mini polder water management in flood management in Tabalong District, South Kalimantan
Authors: Wibowo Anggara Cahyo , Triadi L. Budi 
Published: May 2023

Abstract
Flood disaster is a common problem, especially in densely populated urban, coastal, and basin areas, respectively. This leads to the development of the Mini Polder design, which is used to solve the problem of flooding in agricultural land. The design is projected in lebak swamp in Ampukung village, Tabalong Regency, Indonesia, covering an area of 393 Ha. Therefore, this study aims to determine the hydraulic performance of mini polders in flood management, within Tabalong District, South Kalimantan, Indonesia. Using Hec-RAS in the planning stage, the results showed that a dike was produced with an elevation and a width of +10.30 and 4 m, based on the Q25th flood discharge of 514.37 m3/s. Furthermore, the construction of a channel around the land was planned as a replacement for the retention pond, due to the efficiency of excavation and stockpiling. The channel also functioned as a flood reducer, which approached water sources to the rice fields or community plantations. By excavating the existing outlet and rehabilitating the door building, the channel normalization was subsequently carried out. For emergency conditions, a portable water pump was needed for water supply and disposal of the Tabalong river, during the arrival of the dry season.
Implementation of forest-land rehabilitation to support the enhancement of carbon stock on Indonesia’s FOLU net sink 2030 strategy
Authors: Dharmawan I W S , Pratiwi  
Published: May 2023

Abstract
Indonesia’s critical land area has a declining trend and in 2018 it was recorded that the critical land area was 14.01 million ha. Efforts to restore critical land through forest-land rehabilitation activities are very important strategy for Indonesia to achieve the FOLU net sink by 2030. This strategy contributes significantly as a sinker for CO2 emissions because it will increase carbon stocks. This study aims to review the implementation as well as contribution of forest-land rehabilitation to support the enhancement of carbon stock on Indonesia’s FOLU net sink 2030. The desk study focused on analyse and review the data on rehabilitation program realization and compare to the target of rehabilitation program achievement in the document of Indonesia’s FOLU net sink 2030. Nationally, the increasing carbon stocks by planting trees through forest-land rehabilitation activities during 2015-2019 has reached a total planting area of 1,183,581 ha or an average planting of 236.716 ha/year. Meanwhile, Indonesia’s FOLU net sink 2030 has a target of increasing carbon stocks of 8,255,323 ha during the 2022-2030 period or an average planting target of 917,258 ha/year. This shows that the contribution of increasing carbon stocks through forest and land rehabilitation is very important, but there is still a gap between the realization of planting for the 2015-2019 period compared to the planting target for 2022-2030 to achieve the FOLU net sink in 2030. This gap can be overcome through the following strategies: 1) selection of priority locations; 2) strong funding support from international and private sectors; 3) community involvement actively through appropriate social forestry mechanisms.
Mapping of fire level using S-NPP VIIRS as disaster management reference in Banjarbaru City
Authors: Kumalawati R , Dewi A , Danarto W P 
Published: May 2023

Abstract
Fire is a natural disaster that usually occurs during dry season in both developed and developing countries. Best visualization of fire information is a map, because map is easy to use, and has a strong visual impression. Maps can also be used as a medium to deliver fire mitigation instruction. Fire data can be seen from hotspots data recorded using S-NPP VIIRS satellite imagery. Hotspot data from satellite imagery processed in Arc GIS to compose Fire Level Maps which is then used as fire disaster management reference. Based on this, it is necessary to conduct a study which purposively can map a fire level from S-NPP VIIRS satellite imagery hotspot data so it can used as disaster management reference. So this study entitled as Mapping of Fire Levels using S-NPP VIIRS as a Disaster Management Reference. This research is classified as quantitative descriptive research. Population and samples of the research are all hotspots recorded by S-NPP VIIRS satellite imagery in Banjarbaru City covering Banjarbaru Utara, Landasan Ulin, Cempaka, Banjarbaru Selatan and Lianganggang Subdistrict from 2012-2022. Monthly hotspot data is used in this research and are based on high, medium and low confidence levels. Hotspot data recorded from satellite imagery is processed using geographic information systems and remote sensing technology. The results show the number of hotspots recorded from S-NPP VIIRS Satellite Imagery from 2012-2022 in Banjarbaru City was 2.900 hotspot. The highest number of hotspots was in Linganggang (1429 hotspot) followed by Landasan Ulin (1.165 hotspot) and the least in Banjarbaru Selatan (14 hotspot). Most hotspots are found in dry months; August (307 hotspot), September (1.370 hotspot), October (1.053 hotspot) and November (128 hotspot). The number of hotspots based on the medium level of confidence is mostly found in Banjarbaru City (2.560 hotspot). High number of high and medium confidence hotspots data resulting into higher fire risk. Result from hotspot data processing is a Fire Level Map which can be used as a basis for disaster management so that the negative impact of fires can be minimized.
Identification and management of Toxic & Hazardous Wastes (THW) based on the Indonesian Government Regulation Number 22 of 2021
Authors: Susanto Arif , Hasari Alifah Ainun , Putro Edi Karyono , Yochu Wiliam Engelbert , Mahlisa Rizky , Manuel Anthony Andorful 
Published: May 2023

Abstract
The purpose of this research is to identify and manage toxic and hazardous waste, called THW, present in the Concentrating Division of PT Freeport Indonesia. The identification and management process of this waste was based on the Indonesian Government Regulation Number 22 of 2021. Furthermore, this research uses a qualitative approach where data was collected by field observations and secondary data collection. The data collected incorporated different types and weights of the THW generated in the last 5 years. These wastes were identified based on their level of hazardousness as well as their source. The results showed that the total THW weight generated in the last 5 years was approximately 975,814 kg and the total waste generation rate is 16,264 kg/month. In addition, the most dominant waste types generated include grease waste, fire assay waste, and used oil. Various waste management processes were conducted in this study. They include reduction, storage, collection, and utilization. The identification and management of THW in the Concentrating Division is almost consistent with the Indonesian Government Regulation Number 22 of 2021. However, the process of waste collection in the target area is not yet consistent with this regulation because the Waste Transfer Point (WTP) is still under construction.
Potential development of partnership agroforestry as carbon farming in KHDTK Rarung, Central Lombok
Authors: Nandini R. , Krisnawati  , Rahayu A A D 
Published: May 2023

Abstract
Involving the community is one of the initiatives to promote the national achievement of emission reduction targets. Social forestry with agroforestry systems can establish in the forestry sector to help reduce carbon emissions. In the Forest Area with Special Purpose (KHDTK) Rarung in Central Lombok, carbon storage calculations have been performed for various agroforestry patterns created in partnership. The carbon storage analysis was carried out in four agroforestry patterns: coffee, vanilla, bamboo, and annual crops. The carbon stock of each agroforestry pattern was measured three times on a 20 x 20 m2 plot. The three carbon pools examined were soil, vegetation, litter, and understory carbon. The results showed that a partnership agroforestry pattern is a form of carbon farming that can be widely developed. The bamboo agroforestry pattern has enormous potential for carbon storage.
Water-Carrying capacity in Siwaluh Watershed, Karanganyar Regency
Authors: Kartika Fitria Dewi , Muryani Chatarina 
Published: May 2023

Abstract
The carrying capacity of regional water resources has become a hot topic in water resources research. Siwaluh watershed is one of the areas that need to be assessed for water carrying capacity because the area is very dynamic. This research aims to monitor the carrying capacity of water based on the need and availability of water in the Siwaluh watershed. The Water Carrying Capacity Assessment is based on the Regulation of the State Minister of the Environment Number 17 of 2009 concerning Guidelines for Determining the Environmental Carrying Capacity in Regional Spatial Planning. The water carrying capacity in the Siwaluh watershed is mostly in deficit, meaning domestic water demands are more significant than water availability. However, two villages have a surplus carrying capacity, namely the village in the upstream area, namely Gerdu Village, Karangpandan District and Plumbon Village, Karanganyar District. Gerdu Village and Plumbon Village have Surplus Carrying Capacity because water availability is greater than the need for water. The results of this study are expected to be used as a reference for sustainable management of water resources so that people can enjoy the water for a more decent life.
Investigation of phase modulation and propagation-route effect from unmatched large-scale structures for Doppler reflectometry measurement through 2D full-wave modeling
Authors: FENG Xi , LIU Adi , ZHOU Chu , ZOU Xiaolan , ZHUANG Ge , WANG Shouxin , WANG Mingyuan , LIU Haiqing , DING Weixing , ZHANG Shoubiao , WU Muquan , ZHU Xiang , HAO Baolong , ZHANG Jin , LIU Zhaoyang , JI Jiaxu , ZHONG Xiaoming , LIU Shen , XIE Jinlin , LIN Xiaodong , HUANG Jianjun , GAO Xiang , WAN Yuanxi 
Published: May 2023

Abstract
To interpret the common symmetric peaks caused by the large-scale structure in the complex S(f) spectrum from the heterodyne Doppler reflectometry (DR) measurement in EAST, a 2D circular-shaped O-mode full-wave model based on the finite-difference time-domain method is built. The scattering characteristics and the influences on the DR signal from various scales are investigated. When the structure is located around the cutoff layer, a moving radial or poloidal large-scale structure k

θ
≲ k

θ,match (k

θ,match is the theoretic wavenumber of Bragg scattering) could both generate an oscillation phase term called ‘phase modulation’, and symmetrical peaks in the complex S(f) spectrum. It was found that the image-rejection ratio A
−1/A
+1 (A
±1 represents the amplitudes of ±1 order modulation peaks) could be a feasible indicator for experiment comparison. In the case when the structure is near the cutoff layer with the same arrangement as the experiment for the edge DR channel, the curve of A
−1/A
+1 versus k

θ
can be divided into three regions, weak asymmetrical range with k

θ
/k
0 ≲ 0.15 (k
0 is the vacuum wavenumber), harmonics range with 0.15 ≲ k

θ
/k
0 ≲ 0.4, and Bragg scattering range of 0.4 ≲ k

θ
/k
0 ≲ 0.7. In the case when the structure is located away from the cutoff layer, the final complex S(f) spectrum is the simple superimposing of modulation and Bragg scattering, and the modulation peaks have an amplitude response nearly proportional to the local density fluctuation, called the ‘propagation-route effect’. Under the H-mode experiment arrangement for the core DR, a critical fluctuation amplitude

Amp

(

n

e

,

Mod

.

@

route

)

/

Amp

(

n

e

,

Tur

.

@

MSA

∼ 1.3–4.1 (

Amp
(

n

e
,
Mod
.
@
route

)

refers to the pedestal large-scale structure amplitude and Amp(n
e,Tur.@MSA) refers to turbulence amplitude at the main scattering area) is needed for the structure in the pedestal to be observed by the core DR measurement. The simulations are well consistent with the experimental results. These effects need to be carefully considered during the DR signal analyses as the injecting beam passes through the plasma region with large-scale structures.