bluuebunny/crossref_metadata_2025 huggingface dataset:
Radio properties of green pea galaxies
Authors: Borkar A. , Grossová R. , Svoboda J. , Moravec E. , Kouroumpatzakis K. , Boorman P. G. , Adamcová B. , Mingo B. , Ehle M.
Published: May 2024

Aims. Green peas (GPs) are young, compact, star-forming dwarf galaxies, and local (z ∼ 0.3) analogues of the early galaxies (z ≥ 6) considered to be mainly responsible for the reionisation of the Universe. Recent X-ray observations of GPs led to the detection of high excess emission, which cannot be accounted for by star formation alone and implies the presence of an active galactic nucleus (AGN). We employ radio observations to study the radio properties of GPs, build their radio spectral energy distributions, and verify the presence of AGNs.

Methods. We performed new radio observations of three GPs with the Karl G. Jansky Very Large Array (JVLA) in the L, C, and X bands (1.4, 6 and 10 GHz resp.), and analysed them alongside data from archival observations and large radio surveys. We also analysed the archival radio data for a larger sample of GPs and blueberry (BBs) galaxies, which are lower-mass and lower-redshift analogues of the GPs. To understand the significance of the radio observations, we assess the detectability of these sources, and compare the detected radio luminosities with expectations from theoretical and empirical relations.

Results. Two of the three targeted GPs are strongly detected (> 10σ) in the JVLA observations and their fluxes are consistent with star formation, while the third source is undetected. Although archival radio surveys have the sensitivity to detect a large fraction (∼75%) of the sources from the larger archival sample of GPs and BBs, we only detect a small number (< 40%) of them and their radio luminosity is significantly lower than the expectation from empirical relations.

Conclusions. Our results show that the majority of the dwarf galaxies in our sample are highly underluminous. The radio luminosity–star formation rate (SFR) relation deviates from the empirical relations, especially towards the lower end of galaxy mass and SFR, suggesting that the relations established for larger galaxies may not hold towards the low-mass end.
Swift X-ray and UV observations of six Gaia binaries supposedly containing a neutron star
Authors: Sbarufatti B. , Coti Zelati F. , Marino A. , Mereghetti S. , Rea N. , Treves A.
Published: May 2024

Recent observations have led to the discovery of numerous optically selected binaries containing an undetected component with mass consistent with a compact object (neutron star (NS) or white dwarf). Using the Neil Gehrels Swift Observatory, we carried out X-ray and UV observations of a small sample of these binaries. Four systems are wide (with an orbital period P > 300 d), and were chosen because of their small distance (d < 250 pc) and because the mass of the collapsed component favors a NS. Two others are compact systems (P < 0.9 d) that show strong signs of containing a NS. The source 2MASS J15274848+3536572 was detected in the X-ray band with a flux of 5 × 10−13 erg cm−2 s−1 and a spectrum well fitted by a power law or a thermal plasma emission model. This source also shows a UV (2200 Å) excess, which might indicate the presence of mass accretion. For the other targets, we derived X-ray flux upper limits of the order of 10−13 erg cm−2 s−1. These results are consistent with the hypothesis that the collapsed component in these six systems is a NS.
Theoretical study of the electron-induced vibrational excitation of H2O
Authors: Ayouz Mehdi , Faure Alexandre , Kokoouline Viatcheslav
Published: May 2024

This study presents calculations for cross sections of the vibrational excitation of H2O(X1A1) via electron impact. The theoretical approach employed here is based on first principles only, combining electron-scattering calculations performed using the UK R-matrix codes for several geometries of the target molecule, three-dimensional (3D) vibrational states of H2O, and 3D vibrational frame transformation. The aim is to represent the scattering matrix for the electron incident of the molecule. The vibrational wave functions were obtained numerically, without the normal-mode approximation, so that the interactions and transitions between vibrational states assigned to different normal modes could be accounted for. The thermally averaged rate coefficients were derived from the calculated cross sections for temperatures in the 10–10 000 K interval and analytical fits for rate coefficients were also provided. We assessed the uncertainty estimations of the obtained data for subsequent applications of the rate coefficients in modelling the non-local thermal equilibrium (non-LTE) spectra of water in various astrophysical environments.
The colliding-wind binary HD 168112
Authors: Blomme R. , Rauw G. , Volpi D. , Nazé Y. , Abdul-Masih M.
Published: May 2024

Context. Radio surveys of early-type stars have revealed a number of non-thermal emitters. Most of these have been shown to be binaries, where the collision between the two stellar winds is responsible for the non-thermal emission.

Aims. HD 168112 is a non-thermal radio emitter, whose binary nature has only recently been confirmed spectroscopically. We obtained independent spectroscopic observations to determine its orbit, in addition to radio observations to see if the thermal or non-thermal nature of the emission changes during the periastron passage.

Methods. We monitored HD 168112 spectroscopically for a 13 yr time span. From these data, we determined the orbital parameters, which we compared to the previous results in the literature. The stellar parameters of both components were determined by comparing the spectra to TLUSTY models. From the spectral index of the radio observations, we found how the nature of the emission changes as the system goes through periastron. Combining our results with other literature data allowed us to further constrain the orbital and stellar parameters.

Results. We find HD 168112 to have an orbital period of P = 512.17−0.11+0.41 days, an eccentricity of e = 0.7533−0.0124+0.0053, and a mass ratio close to one. From our spectroscopic modelling, we derived the stellar parameters, but we had difficulty arriving at a spectroscopic mass ratio of one. The radio observations around periastron show only thermal emission, suggesting that most of the synchrotron photons are absorbed in the two stellar winds at that phase. Combining our data with the optical interferometry detection, we could constrain the inclination angle to i ~ 63°, and the mass of each component to ~26 M⊙.

Conclusions. We have provided an independent spectroscopic confirmation of the binary nature of HD 168112. Although detected as a non-thermal radio emitter, near periastron the radio emission of this highly eccentric system is thermal and is mainly formed in the colliding-wind region. This effect will also occur in other colliding-wind binaries.
Trekfish in tracing the paths of flying fish roe in the Makassar Strait
Authors: Putri Rini Sahni , Jaya Indra , Pujiyati Sri , Agus Syamsul Bahri , Palo Mahfud
Published: May 2024

It is very important to know the route of searching for flying fish eggs as information for the next trip and to find out their whereabouts. The existence of flying fish eggs is one of the important agendas at this time, where the available information is still minimal. This article attempts to show the fishing line for flying fish eggs through the use of TrekFish in the Makassar Strait. Fishing paths for flying fish eggs were extracted and mapped using ArcGIS 10.8. Fishing line mapping shows fishing vessel trips per day in each fishing period.
LoRa based long-range traceable life jacket system design
Authors: Apriliansyah Bachtiar Adi , Iqbal Muhammad
Published: May 2024

It is recorded that around 100 people per year die due to fishing boat accidents, the majority of whom are small fishermen with vessels under 10 GT. LoRa is a license-free power-saving long-distance communication technology that can send data packets of up to 15 km in the ocean. The longrange power can be used to determine the location of fishermen when an accident occurs at sea. This research aims to implement and test the performance of LoRa Ebyte E22-400T30D for sending coordinate data on fishermen’s whereabouts in the form of life jackets. The performance observed is the relationship between the distance and the RSSI value obtained. The tests were performed until the furthest distance was reached. The test was carried out at Pangandaran Beach, and the receiver was placed at an altitude of 129 m toward the beach. The data will be displayed and stored on the Thinger.io website. The test results obtained with the furthest distance achieved were 12.983 km with a battery life of 5.99 hours. The RSSI value obtained tended to worsen with increasing distance. Apart from the distance, it was also found that obstructions in the form of trees could reduce the RSSI value.
Monitoring coral reef conditions in the Biorock Pemuteran rehabilitation area during the 2016 coral bleaching
Authors: Subhan Beginer , Arafat Dondy , Jundulloh Muhammad Asrof Abror , Arya Ade Gde Tangkas Vahyu , Setiawan Adip , Wibowo Michelia Masitha , Astika Komang , Karissa Prawita Tasya , Trialfhianty Tyas Ismi , Bachtiar Ramadian , Akbar Nebuchadnezzar , Aisyah Siti Zanuba , Ayu Inna Puspa
Published: May 2024

Pemuteran is well-known for its community-based coral reef conservation activities utilising Biorock technology, through the application of low voltage electricity. The main objective of this research is to assess the condition of coral reefs and fish communities within the Biorock area in Pemuteran, Bali. Data collection was implemented in June 2016 at the bleaching event, employing the Point Intercept Transect (PIT) method, and the Underwater Visual Census (UVCs) method. The benthic community composition at both research stations was dominated by dead coral with algae (Biorock Pemuteran 48.9%, Menjangan Island 51%). Both research locations exhibited branching coral and massive coral as the predominant coral lifeforms. Observational findings reveal noticeable differences in the community structure of coral fish between Biorock Pemuteran and Menjangan Island waters. A total of 11,260 individuals covering 120 fish species across 21 families. Higher fish abundance in Menjangan Island (1,326 ± 224 ind/250 m2) compared to Biorock Pemuteran (551 ± 235 ind/250 m2). The condition of coral reefs at both research locations is included in the poor category (0 – 24.9%). The reef fish community in both Biorock Pemuteran and Menjangan Island is in a stable condition with low dominance level and a moderate to high diversity.
Potential invasive species detection of Demospongiae using environmental DNA in Sabang and Lhokseumawe Ports
Authors: Lestari Dea Fauzia , Yonatika Niken Oktaviandini , Hartanto Mochamad Tri , Cakasana Nadya , Riyanto Mochammad , Salsabila Afviya , Susanti Santi , Triana Denta
Published: May 2024

Sabang and Lhokseumawe Ports are located in the province of Aceh and constitute part of the northern Malacca Strait, sharing direct borders with neighboring countries such as Malaysia, Thailand, and India. Strategic geographical location significantly influences the oceanographic conditions and biodiversity of the area. As marine organisms, sponges play a crucial role in the ecosystem, yet research on their identification in the Sabang and Lhokseumawe regions is limited. The analysis of community structure and identification of species can be conducted using various approaches, including environmental DNA (e-DNA) analysis. This study aimed to assess water quality and identify the presence of potentially invasive Demospongiae using DNA Metabarcoding in Sabang and Lhokseumawe Ports. The measurement results of the water conditions indicate that the waters around Sabang and Lhokseumawe ports generally exhibit values that support sponge life. e-DNA analysis successfully detected the presence of the Demospongiae class, with 260 Operational Taxonomic Units (OTUs) in Sabang waters and 148 OTUs in Lhokseumawe waters. One commonly found genus, Cliona sp., has the potential to become invasive in both locations, posing a risk of bioerosion to corals under specific conditions.
A strange negative Indian Ocean Dipole (IOD) in 2022
Authors: Ratnawati Herlina Ika , Makarim Salvienty , Yu Weidong
Published: May 2024

The Indian Ocean Dipole (IOD) is a prominent pattern of climatic mode in the Indian Ocean that contributes to the changes in Rainfall pattern, Sea Surface Temperature (SST), and Surface Salinity (SSS) in the Indian Ocean. Recently in the scenario of Climate Change, this IOD may experience shifting in the phases development that link to the Indo-Pacific teleconnection. Here, we analyse the changes of negative IOD patterns in 2022 through the SST, SSS, rainfall pattern, and surface current system. This study showed the negative IOD was initiated earlier and coincided with the Asian monsoon during May 2022. The IOD is faster ended in October 2022 when the Australian Monsoon was generated. The Rainfall pattern at the Eastern Indian Ocean (EIO) and the Indonesian Archipelago experienced an intensive pattern from May up to December 2022. During the negative IOD phases, the precipitation at the EIO is more concentrated in Java and less precipitation in Sumatra. The warmer SST and fresh surface salinity in the Indonesian Archipelago are wider following the Pacific SST. This reveals the Indo-Pacific teleconnection is stronger during 2022 via the surface ocean patterns and the coincidence of stronger westerly wind and easterly wind in the maritime continent.
Paleoproductivity drivers in the Banggai Waters, Sulawesi, Indonesia: Insights from elemental analysis of marine surface sediment
Authors: Wiguna Taufan , Yuwono Fareza Sasongko , Zuraida Rina , Atmadipoera Agus , Vogel Hendrik , Damanik Adrianus , Tournier Nicolas , Cahyarini Sri Yudawati
Published: May 2024

Marine productivity, a pivotal factor in marine ecosystems and global carbon cycling, is influenced by various factors including upwelling and terrigenous nutrient influx. We investigated past marine productivity in Banggai Waters, Indonesia, using sediment samples (BUDEE22-29BC and BUDEE22-57BC) and Micro X-Ray Fluorescence (micro-XRF) analyses. Geochemical proxies (K/Ti, Ba/Al, and Zr/Al) help to assess terrigenous influx, upwelling events, and paleoproductivity. Our methodology categorizes productivity into upwelling-driven (UPW), terrigenous influx-driven (TER), and TUP (combined). The incorporation of geochemical proxy data has enabled a comprehensive understanding of historical marine productivity patterns. In BUDEE22-29BC, the K/Ti ratio initially rises and then falls below its threshold, whereas Ba/Al shows spikes and declines before rising again. Zr/Al ratios vary across depths, indicating different paleoproductivity drivers such as terrigenous influence and upwelling. BUDEE22-57BC displayed similar trends in K/Ti, Ba/Al, and Zr/Al ratios, with fluctuations indicating changes in paleoproductivity drivers, including mixing and upwelling effects. The unique positioning of Banggai Waters allows interactions between upwelling, terrigenous influx, and productivity. This study lays the groundwork for further research on past productivity changes and their drivers, thereby enhancing our understanding of marine dynamics.
Stratification of Indonesian Throughflow Water and Its Circulation along 125E in the Banggai - Maluku Sea
Authors: Latuapo Nadzir Hasan , Atmadipoera Agus Saleh , Natih Nyoman M N , Purwandana Adi , Basit Abdul , Zuraida Rina , Noya Yunita
Published: May 2024

secondary pathway of Indonesian Throughflow (ITF) that enters from its inflow portal of the northern Maluku Sea is assumed to recirculate in the Banggai - Maluku Sea, where its upper-layer circulation returns into the Pacific and deeper flows continue southward into Seram/Banda Sea via Lifamatola Strait. However, direct observation in this key region is still limited. Here, using direct CTD (Conductivity Temperature Depth) casts and shipboard ADCP (Acoustic Doppler Curent Profiler) measurement datasets from BUDEE (Banggai Upwelling Dynamics and Ecosystem Experiment) cruise in September 2023, we study stratification and structure of ITF water and its circulation in a meridional section along 125E. The results show the water mass stratification of the mixed layer having a depth of 0-75m with a temperature range of 26-29°C, while the thermocline layer has a depth of 28-407m with a temperature range of 23-26°C, and the deep layer has a depth of 407-1000m with a temperature value of 4-12°C. The current pattern of the Banggai Sea Maluku Sea at a depth of 52-400m is more dominantly influenced by non-tidal currents, the influence of tidal currents only covers a depth of 52m less than non-tidal currents.
Monitoring of coastal dynamics at Subang Regency using Landsat Collection Data and Cloud Computing Based
Authors: A Madinu Abd Malik , Jouhary Naufal Amir , Ulfa Aulia , Rahmadhanti Intan Nur , Pudjawati Nihawa Hajar , Asy’Ari Rahmat , Zamani Neviaty P. , Pramulya Rahmat , Setiawan Yudi
Published: May 2024

This study aims to better understand the coastal dynamics along the 6.89 km of Subang shoreline using Landsat data and GIS methods with cloud computing-based analysis. The data is processed using remote sensing techniques, image classification, and change detection algorithms. Furthermore, this research harnesses cloud computing to efficiently manipulate big data, enabling rapid and measurable analysis of coastline changes. Cloud computing-based platforms facilitate data storage, processing, and dissemination, enhancing accessibility for researchers and stakeholders. This study indicates that the area has experienced significant changes from 1990 to 2023, with the total length of the coastlines that have changed (positive stands for accretion and negative for erosion) being 8.21 km (-16,86 %) for 1990 to 2000, 6.52 km (16.21%) for 2000 to 2010, 8.14 km (6,66%) for 2010 to 2020, and 8.81 km (-19,16%) for 2020 to 2023. The results provide valuable information about erosion, accretion, and coastal morphological changes. The findings can help make informed decisions for sustainable coastal management. The methodology presented in this article demonstrates a solid approach to coastline monitoring that can be replicated in other areas for more efficient and effective coastal management and environmental preservation.
Mapping the distribution of sea urchin (Echinoidea) and benthic habitat using drone in the waters of Lancang Island
Authors: Sastraantara Muhammad Sony , Agus Syamsul Bahri , Susilo Setyo Budi
Published: May 2024

Sea urchins are valuable marine creatures that live in the waters of Indonesia, and typically found in seagrass and coral reefs. This study aimed to determine the distribution of sea urchins and the benthic characteristics that serve as their habitat using high resolution drone images. Object-based image analysis (OBIA) with a support vector machine algorithm is used to identify benthic habitats, while the distribution of sea urchins is determined by thresholding pixel values. A total of 812 aerial photos with a spatial resolution of 3.98 cm/px were obtained and mapped into five classes of benthic habitat (sand, rubble, seagrass, living coral, and dead coral algae). The dominant habitat class obtained was dead coral algae, with an area of 234,035 m2(29.63%), whereas seagrass was the smallest, with an area of 74,149 m2(9.39%). The overall accuracy of the benthic classes was 65.44%, with kappa coefficient value of 0.57. The study found that the total number of sea urchins on Lancang Island was 61,551. The dominant distribution of sea urchins was found in the living coral class with 18,094 individuals, but the highest density was in the rubble class with 1358 individuals/ha.
Analysis of coastline changes using Sentinel 2A imagery in the coastal area of West Pandeglang, Banten
Authors: Huda Asshobirul , Panjaitan James Parlindungan , Agus Syamsul Bahri
Published: May 2024

Coastline changes on the west coast of the Pandeglang Regency are caused by hydrooceanographic parameters and human activities. These changes can be observed through remote sensing. This study aimed to identify and map these changes. The shoreline of the Sentinel 2A satellite image was extracted using the Tasseled Cap method. The shoreline was then calculated using the Digital Shoreline Analysis System (DSAS) method, and field data were collected using Ground Control Points (GCP). The analysis of shoreline changes indicated the dominance of abrasion over accretion. The most significant abrasion occurred in Sidamukti Village at a rate of 26.65 metres per year, while the largest accretion occurred in Sukajadi Village at a rate of 24.92 metres per year. A comparison of the categories of coastline changes can indicate areas that are susceptible to large waves. This information can be used to provide both experience and knowledge to the people of the Pandeglang Regency. The study of coastline changes is an important reference for the development of coastal areas, harbors, tourism, and cultivation.
Assessing land subsidence and analyzing tidal flooding in Tangerang, Banten
Authors: Arhatin Risti Endriani , Gaol Jonson Lumban , Nurjaya I Wayan , Susilo Setyo Budi , Kushardono Dony , Nugroho Udhi Catur , Jumarang Muhammad Ishak , Sinurat Maya Eria , Balbeid Nabil
Published: May 2024

The increase in ocean temperature causes the expansion of seawater volume, resulting in an increase in sea level rise. The phenomenon of land subsidence also exacerbates the occurrence of tidal floods in coastal areas of Indonesia. This has prompted the need for a study of land subsidence and the distribution of tidal floods in Tangerang as a basis for taking anticipatory steps to reduce the negative impacts. The methods used for estimating land subsidence involved the SAR Sentinel-1A. The research utilized a total of 170 data points, spanning from 2017 until 2022. Data processing was carried out using the Parallel Small Baseline Subset method. The supporting data used in this study included SRTM data, tidal range, rainfall data, wind speed and direction. The results of this study reveal that the city of Tangerang has a maximum deformation value of -10.8 cm per year in the Periuk Sub District. Meanwhile, Tangerang Regency experienced land subsidence at a rate of -8.6 cm per year in Kosambi Sub District. Significant subsidence deformations occurred on the northeast side of Tangerang District and the southeast side of Tangerang City. Based on data analysis, it is evident that the total area inundated by tidal floods in Tangerang covers 33.267 hectares, with the largest affected area being in Pakuhaji District, spanning 9,262 hectares.
Temporal detection of Total Suspended Solid (TSS) distribution in the southern area of Obi Island
Authors: Pasaribu Riza Aitiando , Budi Pandu Setya , Saharani Alfira Ayu , Hutagalung Danni Gilbert , Ramadhan Raihan
Published: May 2024

The Halmahera Selatan Regency has many potential natural resources including mining potential, and nickel is one potential that can be found in Obi Island. The abundance of nickel in Obi Island also increases activities that cause various materials to enter the sea. The sediment materials entering the waters through land runoff are suspended sediment or Total Suspended Solids (TSS). Sentinel 2 satellite imageries could observed TSS concentration and its distribution in this research through visible and infrared channels. The distribution of TSS will be determined by using an algorithm, which uses the blue and green bands with corrected atmospheric reflectance format. Based on the data processing results, the distribution of TSS values in the southern area of Obi Island in 2023 was in the range of 4 - 874 mg/l that were divided into three groups of areas, represented by A area within the range of 4 – 874 mg/l, which describes the distribution of TSS in coastal areas without human settlements, B area within range of 4 - 237 mg/l which depicting TSS conditions at river estuaries, and group C area within range of 4 – 431 mg/l which illustrating TSS locations in coastal areas with human settlements.
Proximate composition of Pekasem/fermented barnacle from Bangka Belitung
Authors: Hudatwi Mu’alimah , Akhrianti Irma , Priyambada Agung , Umroh
Published: May 2024

Barnacle is commonly known as biofouling marine organisms attached to hard surface material such as vessels, rocks, wood, and shells. Despite being studied as a biological fouler, some villages in Bangka Belitung Islands Provinces process the barnacle meat into one of the fisheries products called Pekasem. Pekasem is a fermented barnacle with a flavor and scent of salt, sugar, and bay leaves. Fresh Barnacle meat fermentation typically lasts 2-4 days in a closed jar at room temperature. This study aimed to determine the proximate composition of food ingredients produced by fisheries from community groups in Permis, South Bangka Regency Bangka Belitung. This information becomes necessary in fisheries food products that must be included in the packaging of Pekasem. The test results showed that 100 g of Pekasem products contain protein 7.88 g, fat 5.53 g, carbohydrate 6.03 g, moisture 72.87 g, and ash 7.69 g.
Membrane fouling and control in algae-rich water treatment
Authors: Gao Shanshan , Xie Binghan
Published: May 2024

Microfiltration and ultrafiltration membrane technology has now become one of the important methods for algae-rich water treatment due to its better solid-liquid separation effect and microbial retention capacity, while the existence of membrane fouling has been restricting the full-scale promotion and application of low-pressure membrane technology. The main foulants causing membrane fouling in algal-rich water include algal cells, algal debris and algal organic matter AOM (EOM and IOM). In this paper, the mechanism of membrane fouling caused by algal foulants in MF/UF for high algal water treatment is analysed in terms of both individual and composite fouling. Both individual and composite effects of algal foulants can lead to severe membrane fouling, in which algal cells and algal debris mainly dominate the accumulation of filter cake, while AOM mainly leads to membrane pore blockage membrane fouling is exacerbated by compounding effects, with severe reversible and irreversible fouling caused by filter cake formation and membrane pore shrinkage. This paper also discusses several common membrane fouling control methods, including pretreatment (oxidation, coagulation, combined oxidation-coagulation and adsorption) and membrane modification, and it is found that these several membrane fouling control methods can achieve good results.
Digital-based Design Research on Interactive Installation Art--Taking the Ecological Diversity Development of Coral Reef as A Case
Authors: Lin Hanxi
Published: May 2024

Surpassing traditional communications, interactive installations in the digital era prefer a sophisticated integration of sensing technologies and programming languages, so as to provide viewers with more profound experience. In this study interactive installations are taken as media to explore the ecological development of coral reef in further digital process through Arduino and Touch Designer programming. In this way, users can have immersive experience by two-way interactions with the device, thus expanding the understanding between humans and the natural environment. In addition, the innovative use of interactive installations in advancing ecological researches and potential new solutions to environmental problems through the art of programming are also discussed. Therefore, this study inspires new ideas from the harmonious coexistence of humans and the nature, providing insights into coral reef conservation and its sustainable ecological diversity.
Design of wound vegetation restoration measures for upper and lower reservoir connecting road project of pumped storage power station in northwest cold and arid regions
Authors: Yang Peng , Li Quan , Yan Binzhou , Yang Zhen , Sun Chao
Published: May 2024

Taking a pumped storage power station in the northwest cold and arid regions as an example, this paper summarizes the construction technology and method of wound vegetation restoration in the upper and lower reservoir connecting road project of pumped storage power station in the northwest cold and arid regions, as well as the system of measures including the selection of suitable plants, the design of soil covering engineering, the design of plant measures and the construction technology. The soil covering engineering and plant measures were designed according to different wound types. The soil preparation of the Yurian pit and the ridge outside the pit were constructed with planting bags, arbor and shrubs were planted inside the pit, Picea asperata Mast. was selected for arbor and Juniperus sabina L. for shrubs, and forest vegetation blanket was used on the upper slope with a gentle slope, and shrubs and grass seeds were mainly planted with Poa annua L., Stipa capillata L. and Artemisia frigida Willd. The above vegetation restoration measures were designed. It greatly reduces soil and water loss in the reservoir area, improves vegetation coverage in the reservoir area, and enriches plant diversity, making the wound surface of the upper and lower reservoir connecting road of pumped storage power station gradually restore to the natural environment plant community state before the destruction.
Design and Research of Multi-point Water Quality Monitoring System Based on Internet of Things
Authors: Jia Na , Zhang Yanjie
Published: May 2024

With the increasing demand for water quality monitoring and the increasing severity of water pollution, the water environmental quality in China faces a worrying situation, and water body monitoring has become an extremely important task. Now more than ever, new strategies for water quality monitoring are needed, and the rapid development of wireless monitoring technology perfectly meets people’s pursuit of low-cost, automated and real-time water quality monitoring. However, there are still problems such as few monitoring points cannot reflect the overall situation of water bodies, high artificial costs, and time-consuming analysis. This paper designs and implements a new water monitoring platform built on an Internet of Things platform. Taking water quality monitoring sensors as the core and small boats as the basic framework, it carries control, positioning, navigation equipment, uses wireless network as the data transmission means, monitors multi-point cruising sampling in different areas, realizes real-time collection, data storage and data analysis to complete related environmental monitoring. The multi-point online water quality monitoring system comprehensively applies sensor technology, Internet of Things technology and cloud computing technology to form an integrated online monitoring system. It aims to solve the problems of harsh working environment, strong repetitiveness and long sampling time of water quality monitoring tasks, and achieve fast, efficient and accurate completion of water quality monitoring tasks.
Using the overall variation trend and fitting of Na-feldspar crystal plane spacing after chemical corrosion to prevent rock disasters
Authors: Zhang Zhengliao , Xue Jinchun , Wan Yunshuai
Published: May 2024

Sulfuric acid pollution, caused by acid rain, acidic wastewater, and natural acidic wastewater from mines, poses a significant risk to the stability of natural stone slopes and human stone structures. This study aims to develop a non-mechanical testing method for assessing the degree of acid corrosion in rocks, facilitating early intervention by safety engineers. The proposed method involves using XRD to measure the crystal plane spacing of Na-feldspar corroded by different concentrations of sulfuric acid, followed by mathematical analysis to determine the overall deviation degree of the crystal plane spacing. Four Deviation indices were defined to characterize the degree of acid corrosion, and all four indices increased with increasing acidity. By comparing trend charts, an optimized number of crystal planes for analysis was identified. Selecting the 100 sets of data with the largest spacing yielded similar trend results as selecting all the data. In addition, five different fitting methods were compared, and the power function fitting of Weighted Sum of squares of cumulative errors (WSSCE) was found to provide the optimal empirical formula, with a correlation coefficient exceeding 0.98.
Research on Quality Grading Evaluation and Performance Prediction of Construction Waste Recycled Materials
Authors: He Jia , Zhu Xiaodong , Xue Danxuan
Published: May 2024

The application of construction waste in road engineering is an effective means to improve the level of resource recycling. Due to the lack of specialized sorting equipment for different types of construction waste and the high cost of manual sorting, resource utilization enterprises mainly rely on mixed crushing and regeneration in production, while there is a lack of systematic research on the application technical indicators of recycled aggregates for brick concrete mixed construction waste. This article proposes a quality evaluation model for construction waste coarse aggregates based on the theory of matter element extension, providing new ideas for quantitative evaluation of the quality status of coarse aggregates, and also providing reference for the rational selection of recycled coarse aggregates and the determination of mechanical parameters of coarse aggregates in the construction process, which is conducive to the evaluation and analysis of the quality status of recycled coarse aggregates.
Research and application of carbon emission data sharing model based on privacy computing
Authors: Shi Ying , Wang Lixing , Ao Jin , Song Jie , Li Qian , Zhang Xuesen
Published: May 2024

In the context of the dual-carbon goal, improving the level of scientific and technological innovation of modern carbon emissions and achieving comprehensive green development are not only one of the trends and important reform directions of today’s world development, but also the core content of achieving sustainable development. Taking the power industry as an important breakthrough, this paper uses blockchain technology and privacy computing technology to integrate data from the government, power grid, taxation and banks, and proposes a blockchain-based privacy computing algorithm for carbon emission scores to create an execution environment for trusted sharing of carbon emission data, expand channels for carbon emission data collection, and give full play to the value of big data on carbon emissions. Promote the realization of dual carbon goals as soon as possible.
Assessing the Ecological Implications of Ocean Iron Fertilization: Insights from Post-Eruption Volcanic Processes
Authors: Sun Bill
Published: May 2024

This study proposes the usage of post-eruption volcanic processes as a natural analog for assessing the potential impacts of man-made iron fertilization on ocean ecosystems. Data is compiled from the 14 most explosive volcanic eruptions since 1884 to establish correlations between climate temperature anomalies and phytoplankton growth induced by volcanic tephra fallout in addition to other post-eruption variables. Through a comparative analysis of the contrasting strengths of these relationships using a student t-test for statistical significance, multivariable regression analysis, and linear regression interpretation, the scale of ocean iron fertilization is quantified. Two well-documented modern volcanic eruptions in Hawaii and Iceland are additionally employed as case studies to provide a comprehensive understanding of micro phenomenons occurring post-eruption. Rapid algae growth is demonstrated in High Nutrient Low Chlorophyll regions (HNLC), where long-term growth can be sustained for up to six months. Statistical results isolate the effect of stratospheric injection from ocean iron fertilization, demonstrating the effectiveness of tephra ash fallout in inducing regional phytoplankton growth. In all, these findings contribute to a comprehension of the potential ecological consequences of iron fertilization efforts, an approach to assess environmental implications without direct experimentation.
Research status of refractory treatment technology of carbon-bearing gold ores
Authors: Zhang Xiaoguang , Li Guangsheng , Zhu Xingfu , Qin Guanglin
Published: May 2024

Carbon-bearing gold ore is one of the important refractory gold resources, which can not be effectively utilized by conventional treatment methods. In this paper, the main reasons for the difficult treatment of carbon-containing gold ore, the material composition of carbonaceous matter and the mechanism of carbonaceous matter “robbing gold” are analyzed. At the same time, the working principles of several pretreatment methods are summarized, and the advantages and disadvantages of each pretreatment method are analyzed, so as to provide strong technical support for the future development of carbon-bearing gold ores in China.
A Hydrogen Production System Based on Ammonia Combustion Heat: Graded Decomposition and Parameter Analysis
Authors: Kang Zongyao , Liu Bin , Huang Jingzhong , Fan Hao , Wang Kaihui
Published: May 2024

This study introduces a hydrogen production system that utilizes the heat from ammonia combustion for graded decomposition. About 17% of the ammonia undergoes combustion to provide heat for the subsequent decomposition of the remaining ammonia. To enhance economic efficiency and reduce costs, a design combining precious and non-precious metals is employed, aiming to decrease the usage of precious metal catalysts without compromising decomposition efficiency. Considering the required temperatures for the two catalysts, high and low-temperature decomposers are established to achieve cascaded energy utilization in the flue gas. The preheating temperature of ammonia before entering the decomposer plays a crucial role in both ammonia decomposition efficiency and the system’s fuel consumption. Following optimization, the system yields 493.6kg/h of hydrogen with an inlet ammonia flow rate of 4000kg/h. Concurrently, the discharge temperature of the flue gas decreases to 378.59K, effectively utilizing a substantial portion of the energy. This study introduces a novel approach to designing an ammonia decomposition system using ammonia combustion as a heat source, and it serves as a reference for subsequent optimization.
Investigation on the properties of PVDF matrix composite porous gel polymer electrolyte doped with lithium silicon gel
Authors: Li Kairui , jin Biao , zhang Tong , Fei Qiang , Zhen Shubing , Xu Jingyu
Published: May 2024

Gel polymer electrolytes are safer because they do not contain liquid phase components. On this basis, the introduction of inorganic fillers effectively overcame the problem of low ionic conductivity of polymer electrolyte at room temperature, and the constructed composite polymer electrolyte (CPEs) combined the advantages of inorganic fillers and polymer segments. In this paper, lithium silicon gel SiO2(Li+) was prepared by in-situ polymerization and sol-gel method, and doped in PVDF composite porous gel polymer electrolyte film prepared by immersion precipitation method. The electrochemical properties and surface topography of lithium iron phosphate were investigated by mounting a bonded lithium iron phosphate quasisolid lithium-ion battery. The experimental results show that the solid electrolyte film modified by SiO2(Li+) has good electrochemical and a certain reference value.
Research on cleaning scheme of photovoltaic power plant based on pollutant composition analysis
Authors: Cheng Wenji , Wang Shujuan , Zhao Lei , Yang Bo , Niu Kai , Wu Qiong
Published: May 2024

Solar photovoltaic (PV) modules, as an important component of the photovoltaic conversion process within a PV system, are closely related to the efficiency and service life of the PV system’s overall work performance. Dust in the atmosphere is affected by rainfall, electrostatic forces, van der Waals forces and gravity, and will gather together and settle on the surface of the PV module to form dust accumulation, which reduces the amount of radiation and light energy absorption. Therefore, it is really necessary to carry out the research on the pollutant composition and treatment measures program of the surface pollution index of PV modules.
Application of geophysical techniques based on multi-attribute inversion in predicting high-quality source rocks
Authors: Li Hongye , Chen Dan , Guan Haiyang
Published: May 2024

Total organic carbon (TOC) content is an important indicator for evaluating the quality of source rocks. Conventional laboratory analysis and testing, single well interpretation, and other methods are limited by sample data or the number of well locations, and cannot comprehensively and accurately predict the planar distribution of TOC content in source rocks. Based on this, a method for predicting TOC content using seismic inversion with multiple attributes is proposed. The basis for applying seismic attributes to study TOC of source rocks is the inherent relationship between seismic and logging data. By using logging data to calculate TOC, the correlation between seismic attributes of well side seismic traces and logging is established, and seismic attributes are converted into TOC of source rocks. The results show that the TOC content in the third section of the Shahejie Formation of the Liaohe Depression is relatively high, distributed in the range of 1% to 5%. The trend of planar variation is manifested as a gradual decrease from the centre of the depression to both sides, and the centre is concentrated in the Panshan and Qingshui area. The overall prediction effect is good, proving the strong feasibility of this method.
Research and application of drilling technology for grouting transformation in coal mine strata——Taking Huainan Zhangji Mine as an example
Authors: Liu Wenwu , Guo Kun , Li Chao , Wang Yuchao
Published: May 2024

In order to solve the problem of water disaster in coal mining and realize the safe mining of working face, the drilling technology of grouting reconstruction in coal mine strata is studied, and the key parameters in grouting construction are optimized and determined. According to the characteristics of engineering implementation, the optimization design of drilling casing program, the optimization of drilling tool assembly, the preparation of multi-type drilling fluid and the optimization of drill bit are introduced to ensure the smooth implementation of the project. According to the trajectory design requirements, the landing point of the main hole drilled into the coal seam floor to control the limestone layer was calculated. The results show that the construction technology and technical method are suitable for the multi-branch horizontal grouting well project in coal mine, which achieves the safe and efficient drilling of grouting well in coal mine, and provides useful experience for the subsequent grouting well construction in this area.
Performance Optimization Analysis of An Air-source Heat Pump with Multi-Stage Waste Heat Recovery
Authors: Xu Han , Xueye Chen , Jiachao He , Bin Yang
Published: May 2024

In this paper presents the effect of different outdoor ambient temperatures and heating temperatures on the performance of an air-source heat pump drying system with multi-stage waste heat recovery has been analysed by recording actual operating status of the system for a little longer-term period. The results show that COP of the heat pump with any heat recovery mode will increase with heating temperature reduction or ambient temperature rising like that does it without heat recovery. As outdoor ambient temperature increasing, the suitable heat recovery mode to enhance COP of the heat pump drying system changes from mode 1-3 to mode 1-2-3 and then to mode 1-2. Especially outdoor low-temperature ambient conditions in winter, 1-3 under would both enhance COP and improve the problem of evaporator frost. But the waste heat utilization rate ηT of whole system is lowest. Moreover, it can be supposed by comparing η with ηT that the first-stage heat exchanger unit of the heat recovery system and the energy transfer fluid circulating in the system would be potential for optimization to further enhance the performance of whole air-source heat pump drying system.
Research on the Application of Heat Pump with Different Coupling Methods in Heating Terminal
Authors: Wang Zheng , Zhang Fengxia
Published: May 2024

Under the dual pressure of energy supply and demand contradiction and increasingly severe environmental pollution, adopting clean energy to replace traditional fossil energy, reducing conventional energy consumption, and achieving clean heating is a necessary measure for China to build a resource-saving and environmentally friendly society. In order to achieve the above goals, heat pump technology is receiving attention and promotion from people. Analyze the application of solar and air source heat pump combined heating systems and water source heat pump and air source heat pump combined heating systems based on the comparison of two coupling methods and temperature distribution at different heating ends.
A brief analysis of characteristics and cost-effectiveness of energy storage technology in the power system: A case study of Shandong province
Authors: Li Qiushuang , Li Yan , Zhao Xin
Published: May 2024

This paper sorts out the working principles and technical characteristics of current mainstream energy storage technologies, forecasts the development prospects of energy storage in China, discusses the main application scenarios and profit models of energy storage in China, and conducts cost estimation for relatively mature energy storage methods such as lithium-ion battery, lead-carbon batteries, sodium-ion batteries, flow batteries compressed, air hydrogen and fuel cells. Finally, based on the actual situation of energy storage industry scale and layout in Shandong Province, suggestions are proposed for the future development direction of energy storage and related supporting policies in Shandong Province.
Évaluation qualitative du vécu des étudiants hospitaliers brestois au sein du service d’odontologie : étude EQUAVECU
Authors: Le Fur Bonnabesse Anaïs , Wolff Jonathan , Loddé Brice , Bodéré Céline , Arbab Chirani Reza , Pougnet Richard , Chevalier Valérie
Published: May 2024

Contexte et problématique : Les études d’odontologie sont décrites dans la littérature comme enthousiasmantes, très tôt professionnalisantes et comme stressantes avec des conséquences potentielles sur la santé mentale des étudiants. Objectif : Évaluer le vécu de l’étudiant-hospitalier à l’Unité de formation et de recherche (UFR) en odontologie de l’Université de Bretagne occidentale (Brest, France). Méthodes : Lors de cette étude qualitative, douze entretiens individuels d’étudiants hospitaliers inscrits à l’UFR d’odontologie de Brest en quatrième, cinquième ou sixième années ont été réalisés et enregistrés. Après transcription des verbatim anonymes, les entretiens ont fait l’objet d’une analyse thématique inductive par deux investigateurs en codes sources puis codes axiaux, ensuite regroupés en catégories. Résultats : Cinq catégories ont été dégagées : l’environnement de travail, la formation, la gestion du patient, les relations interprofessionnelles et les interactions avec la vie extérieure. Le rythme important, la validation des années universitaires, le comportement de certains enseignants, le manque de fauteuils, les défauts d’organisation dans le service et l’impact sur la vie sociale majorent un stress déjà induit par les compétences à acquérir (techniques et de relation de soin) par un futur professionnel de santé. Pourtant, la formation est jugée de qualité, ainsi que le matériel mis à disposition. Les étudiants notent que la majorité des enseignants est investie et bienveillante. Le contexte de vie de l’étudiant et la participation à des activités extra-universitaires permettent de moduler le stress ressenti. Conclusion : À partir du vécu des étudiants, cette étude propose des pistes de réflexion pour améliorer le bien-être des étudiants hospitaliers en odontologie.