bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on phase selection control characteristics of fast vacuum circuit breakers suitable for new power systems
Authors: Xu Xiaodong , Lin Jinyang , Tian Yang , Li Zhibing , Zhang Ran , Tian Yu 
Published: August 2024

Abstract
With a high proportion of new energy access to the power system, the user side of the randomness and volatility of distributed photovoltaic large-capacity access to the 10 kV medium-voltage distribution grid operation results in more frequent fluctuations in the system voltage and more frequent switching of reactive compensation of the shunt capacitor bank on the 10 kV side of the conventional substation. Conventional reactive compensation switching circuit breakers adopt a spring mechanism whose mechanical stability is insufficient and the selection of the relevant fit capacitor bank accuracy is not enough. The 12 kV fast vacuum circuit breaker of small mechanical dispersion for selection related to the combination was proposed. First of all, based on the neutral grounded and ungrounded system of the capacitor bank, the strategy of capacitor bank phase selection closing was developed. For the action characteristics of the phase selection of the 12 kV fast vacuum circuit breaker, the variation laws of mechanical dispersion and the influence factors such as ambient temperature, capacitance voltage, capacitance degradation, mechanical wear, and conductive rod deformation were obtained by simulation and experiment. The results showed that the ambient temperature and capacitance voltage had a great influence on the switching time of the fast circuit breaker, while other factors had a small influence. Again, the pre-breakdown characteristics of the 12 kV fast vacuum circuit breaker were obtained by experiments. The results showed that the influence of contact opening distance and pre-breakdown voltage was a linear relationship, and the pre-breakdown slope was 30 kV/mm. According to the pre-breakdown closing characteristic curve, the pre-breakdown time of the fast circuit breaker was 0.45 ms at most. The feedforward compensation mechanism based on a neural network was proposed to compensate for the action characteristics of the fast circuit breaker and aimed to improve the phase selection accuracy. Finally, two rounds of capacitive current switching tests of 12 kV fast vacuum circuit breakers with C2 level were carried out in a third-party test station. The accuracy of phase closing is within the ±0.5 ms closing window, effectively preventing the occurrence of closing inrush current.
Analysis of adaptive parameter tuning control strategy of VSG
Authors: Yang Shimei 
Published: August 2024

Abstract
The traditional virtual synchronous inverter employs constant inertia and damping control, resulting in poor reliability when the system faces disturbances. Consequently, this paper proposes a synchronous virtual machine network control strategy based on adaptive technology. Firstly, the traditional principle is analyzed, followed by an examination of the effects of varying inertia and damping levels on the power grid. Leveraging the power angle characteristic and frequency oscillation characteristic of synchronous generators, an inertia and damping adaptive control strategy is devised. Subsequently, the effectiveness of the strategy is validated through simulation curves generated by a Simlink model.
Weakened by an infinite system of transverse periodic cracks piezoelectric waveguide as a filter of electroacoustic waves
Authors: Avetisyan A S , Khachatryan V M , Kamalyan A A 
Published: August 2024

Abstract
The problem of propagation of an electroactive unidirectional elastic shear wave signal in an infinite piezoelectric waveguide weakened by a periodic system of transverse cracks is considered. Wave formation is investigated in cases of different anisotropies of the piezoelectric material, under different electromechanical conditions on the waveguide surfaces. In contrast to the case of a homogeneous waveguide, the presence of a system of periodic cracks leads to the formation of Floquet waves with a periodic structure. Different anisotropies and asymmetric electromechanical conditions on the waveguide surface lead to different localization of wave energy over the thickness of the waveguide, as well as to the presence of different zones of acceptable frequencies. A comparative analysis of the influence of the presence of a periodic system of transverse cracks on the frequency transmittance of the waveguide is carried out.
Creation of a nickel composite using surface structuring of the reinforcing phase with titanium carbide nanostructures to improve strength properties
Authors: Smirnov V M , Morozov P E , Kudymov V K , Dermenji A S , Sidorov Y V 
Published: August 2024

Abstract
The development of metal matrix composite (MMC) materials is one of the demanded areas of research in materials science. In line with this trend, there is an increasing interest in nickel-based MMC materials, which have already become classic in science and technology. This is due to the high demand for Ni-based materials with high strength characteristics, high hardness, and increased heat resistance.
In this research, we proposed an approach to obtain a MMC material using the surface structuring process, ALD (Atomic Layer Deposition) and powder metallurgy method. The developed approach provides a composite with TiC nanostructures (1-5 nm) uniformly distributed throughout the Ni matrix. The absence of interphase boundaries between the Ni matrix particles and carbide nanostructures made it possible to minimize the internal porosity of the sample. This is due to the strength of the interphase boundaries between the matrix and the reinforcing phase in the composite and to the solidity of the structure. As a result, the created material effectively resists plastic deformation and stress. This allows not only to enhance the strength properties of the composite, but also to maintain the MMC plasticity, which increases its processing ability.
Analysis of the periodicity of movements of mechanisms with elastic links of variable length
Authors: Kurdina S P , Gevorgyan H A 
Published: August 2024

Abstract
Elastic dynamic systems with open kinematic chains are effectively described by a recursive model of the generalized Newton–Euler method with the provision of computational algorithms with a degree of complexity proportional to the dimension of these systems, i.e. O(n). Such systems, in particular, are elastic manipulators, some of which are discussed in this article. In the case when elastic dynamical systems have closed kinematic circuits, the application of a numerical analysis strategy without reversing the mass matrix is extremely difficult. The analysis of the simplest type of elastic mechanisms with closed circuits, such as a crank–slide mechanism and a four–pin mechanism with elastic connecting rods, revealed a peculiar picture of the periodicity of the functions of elastic movements of connecting rods, which differs significantly from the periods of operation of the mechanisms themselves. In this article, the properties of the periodicity (or pseudo-periodicity) of the elastic displacement function of mechanisms with elastic links of variable length are investigated using examples of numerical dynamic analysis of crank–rocker mechanisms.
Influence of inter-ion Coulomb interaction on the dynamics of ionic crystal vibrations under pulse loading
Authors: Zimin B A , Sudenkov Yu V , Yalych E S 
Published: August 2024

Abstract
The low frequency (acoustic) oscillations of an ionic crystal under pulse loading are considered. Considering the large contribution of the Coulomb energy to the binding energy for ionic crystals, the dynamic equations of the oscillations are written using the Maxwell stress tensor determined by the second moment 〈EiEk
〉 of the electromagnetic stress field. The analysis of Maxwell’s and Euler’s equations allows us to establish the dependence of the elastic moduli on the RMS value of the electromagnetic stress field in ionic crystals. At the initial moment of stress, this value is equal to zero and we obtain the value of the volume modulus of the liquid, which is confirmed by experiment.
β
+ surgical radio-guidance using a small Compton-angles collimation probe
Authors: Mehadji Brahim , Dupont Mathieu , Montrot Adrien , Roncali Emilie , Morel Christian , Farman Bardia 
Published: August 2024

Abstract
The fields of radio-guided surgery and interventional
nuclear medicine benefit from a growing array of technologies that
aid novel healthcare interventions. Among them, surgery probes able
to efficiently detect β
+ emitters are essential to localize
tumors previously detected in PET images. Different methods have
been proposed for 18F radio-guidance within the body such as
detection of 511 keV annihilation photons using electronically or
mechanically collimated probes. The main limitations to the
widespread use of these techniques are the lack of precise
directional capabilities and inadequate sensitivity. We first used
the Monte Carlo simulation platform GATE to determine the optimal
signal to noise ratio that can be achieved with an ideal probe.
Then, we focused on investigating a small Compton-angles collimation
prototype probe followed by the construction of an initial proof of
concept demonstrator. The performance of the small Compton-angles
collimation probe was compared with a commercial probe based on
mechanical collimation in terms of sensitivity and
directionality. Monte Carlo simulations showed that in case of an
ideal probe, with a tumor of 1 cm diameter positioned 5 mm under
the skin and with a SUV of 2, the measured signal to background
ratio would be of the order of 25%. The small Compton-angles
collimated probe prototype showed significantly improved
directionality compared to the commercial probe with mechanical
collimation, despite having a sensitivity lower than the commercial
probe. Monte Carlo simulations provide insights into the substantial
impact of the background on the measured signal. Furthermore, the
application of small Compton-angles collimation yields promising
outcomes, particularly in terms of improving the directionality,
with the objective of enhancing the detection of tumors. In
addition, the studied prototype probe sensitivity can possibly be
improved by upgrading the detector crystal material and geometry.
Artificial Intelligence-Based Landslide Studies in Indonesia: A Systematic Review in Recent Years
Authors: Kristyanto T H W , Wusqa U , Destyanto T Y R 
Published: August 2024

Abstract
Landslide is still a hot topic in geological hazard discussion, including Indonesia. Various methods, including Artificial Intelligence (AI), are used to do research development on landslide topics. Therefore, this paper aims to present a comprehensive review of AI-based landslide studies that focus on specific application area, feature engineering method (FEM), and Digital Elevation Model (DEM) sources used in the studies. This research used a qualitative method with a systematic review approach toward recent landslide studies (2012-2022) that investigated systematically in a synthesis. The exploration resulted in 26 papers from national and international indexed journals or proceedings, which filtered into 13 articles that discuss or mention the specific application area, FEM, and DEM sources. The analysis shows that AI applications in landslide studies are dominated for landslide susceptibility mapping and still a few for other applications. It also shows that almost all AI-based landslide studies chose SRTM as the source of DEM. Regarding FEM, only five articles discussed important landslide factor selection. There are four FEMs that were used in those studies, i.e., variable deduction, certainty factor model, C.45 algorithm, and variable importance ranking. From the deep analysis of those 13 articles, it can be concluded that AI-based landslide studies in Indonesia still need to be developed instead of focusing on landslide susceptibility mapping only. Studies to find effective landslide factors and compatible DEM resources using AI also can be new opportunities for landslide experts.
Multi-Parameter Approach to Determine the Floods Causes in North Luwu, South Sulawesi.
Authors: Hendrayana H , Riyanto I A , Nuha A , Ruslisan  
Published: August 2024

Abstract
Floods occur annually in North Luwu, South Sulawesi Province, Indonesia. The exact cause of the flooding is yet to be known; thus, this study aimed to find the main factors causing floods in North Luwu using a multi-parameter approach. The methods applied are hydrological, flood susceptibility, and land use changes in the analysis. The return period and intensity duration frequency of rain (1983-2021) was used for hydrological analysis. Flood susceptibility is obtained from the processing of slope, elevation, rainfall, stream density, soil type, and land use parameters. Land use change was analyzed using the Climate Change Initiative and Land Cover (CCI LC) data in 2000 and 2015. The results of the 1-year rainfall return period in North Luwu were relatively high, namely 83 mm/day, the 2-year return period of 119 mm/day, 5 years of 142 mm/day, 10 years of 155 mm/day, and 100 years 184 mm/day. The results of the IDF analysis obtained that the early rainy hours showed an intensity of 41-46 mm/hour with a total of 259 mm/day, which was considered extreme. There is unity between the results of the correlation of flood events in 2021 with recorded rainfall of 64-153 mm/day. Flood susceptibility analysis shows the dominant high vulnerability in the downstream area of 101,337 Ha, medium vulnerability (208,545 Ha) in the middle stream, and low vulnerability of 57,719 Ha upstream. The high flood susceptibility map results followed the flood events distribution from 2017-2021, while there is a lack of change in the land use analysis.
Sinkholes Mapping in Tanjungsari, Gunung Kidul Regency, Yogyakarta: A Preliminary Data for the Assessment of Sinkhole’s Susceptibility
Authors: Say Sokvireak , Prakasa Eka Putra Doni , Kakuya Matsushima 
Published: August 2024

Abstract
Tanjungsari district is located in Gunung Kidul Regency, Yogyakarta, known as the karst region where the dissolution process has taken place and caused some sinkhole occurrence. However, there is no any study that carry out the characteristic and the specific number of sinkholes presence in this area yet. Therefore, this study aims to create a sinkhole map in the study area with the observation of its physical characteristics based on some important data such as lithological data, geomorphological feature, existed sinkhole location as well as its physical characteristic that were collected by field observation and the secondary data evaluation. Limestone is the only lithology type was found in the study area and it is likely to be influenced by the dissolution process. Furthermore, there are more than 20 sinkholes were found with approximate 1m to 80 m in diameter and a few meters onward in depth. Some of them formed like a shallow bowl and some are vertical wall. Most of them associated with the gentle slope and the soil cover area. The results from the study will serve as important information for further detail study such as sinkhole’s susceptibility mapping.
Characteristics and potential of coal for coking coal in Meliat Formation, Tarakan Basin, Nunukan, North Kalimantan, Indonesia
Authors: Kurniadi M , Rahmat S B , Amijaya D H , Anggara F 
Published: August 2024

Abstract
Coking coal is coal that melts, expands, then reconsolidates during carbonization and can produce coke as an iron refining agent in blast furnaces. Characterization of the potential of coking coal in Indonesia is still being developed. The research was conducted to find out how the potential of coal in the Meliat Formation for coking coal. The purpose of this study was to determine the characteristics and potential of coking coal from coal has been mined at PT. Duta Tambang Rekayasa and it was included in that formation. The samples analyzed were 4 units and the sample was a blend of coal has been mined at seams E, F, and G. The result, all coal has high ash (> 10% adb), volatile matter (> 31% dmmf), sulphur (> 1% daf), H/C (0.88 - 1)(%daf), O/C (0.11 - 0.19)(%daf) and a low vitrinite reflectance (Rmax < 0.5), which indicates that the coal parameter does not match the requirements for coking coal. the low CSN test values (1 - 1.5) and GKCT (B and C type) are the keys to coal in this research including non-coking coal. This coal will produce poor quality coke because many substances will evaporate and do not have plastic properties.
Fracability Modeling in Shale Hydrocarbon Development Based on Geomechanical Analysis of Well Log and Mineralogy Analysis of Drill Cuttings: A Case Study of the Lower Baong Fm and the Belumai Fm of the NSB-001 Well in the North Sumatra Basin, Indonesia
Authors: Buntoro Aris , Rahmad Basuki , Nurcholis M. , Septama Erlangga , Haryanto Lukmana Allen , Anuraga Edo 
Published: August 2024

Abstract
The North Sumatra Basin, Indonesia has a very large shale hydrocarbon potential, especially from the Lower Baong Formation and the Belumai Formation. The Belumai and Lower Baong Formations were deposited in the Early Miocene - Middle Miocene, in transgression conditions, when the North Sumatra Basin was in the regional sagging phase. These conditions greatly affect the facies and diagenetic changes of quartz, smectite and kaolinite minerals in rock fracability. The main problem in producing shale hydrocarbons is the very low permeability of unconventional-shale-reservoirs, so that at the production stage of shale hydrocarbon, a fracability model is needed as a basis for planning hydraulic fracking, thus the fractures are connected to each other and can flow the hydrocarbon fluid optimally. From the results of previous studies, it was shown that the shale hydrocarbon fracability value was controlled by lithofacies, and correlated with rock brittleness, brittle mineral content, clay content, and compressive strength. The fracability model is used to determine fracable zone intervals as a candidate for hydraulic fracking, by using geomechanical analysis of well log data and mineralogy analysis of drill cuttings data from the NSB-001 well as a case study. Based on the correlation results of lithology (Mud Log), mineralogy analysis, MBT, and TOC (Drill Cuttings), the sweetpot fracable window (fracable zone interval) can be determined, which is correlated with the presence of fracture barrier.
Aquifer Mapping Using Geo-Electrical Resistivity Survey for Seepage Mitigation in Kuwil Kawangkoan Dam, North Minahasa, North Sulawesi, Indonesia
Authors: Setiawan Rizal , Arya Pranantya Pulung 
Published: August 2024

Abstract
The dam built in an area with a productive aquifer system has potential seepage, influenced by groundwater presence. Seepage can cause instability in the main dams or slopes around the dam. An initial assessment of subsurface geological conditions needs to be done to identify groundwater potential as information in mitigating seepage potential in the dam. Kuwil Kawangkoan Dam is located in the Manado groundwater basin with a high groundwater potential. The 2D electrical resistivity approach with the Wenner configuration was applied in this study. Geoelectric data was acquired on 12 lines spread across the dam area. The measurement results show a resistivity value of less than 300 Ωm, indicating the layer is composed of unconsolidated pyroclastic sediments in the form of sand–gravel. This layer has a depth of around 35 m from the surface. The lithology found is dominated by tuff lapilli with pumice fragments that have the potential as an aquifer.
Seroja Tropical Cyclon Destruction Case Study: Permanent Slope Protection Evaluation at Downstream of Rotiklot Dam Nomenclature Building, East Nusa Tenggara, Indonesia
Authors: Himawan M S , Putranto T T 
Published: August 2024

Abstract
Rotiklot Dam was one of some infrastructures which was affected by the Seroja Tropical Cyclone in East Nusa Tenggara Indonesia in April 2021. There are several landslides at the downstream of the dam that can threaten the safety of the dam, especially at the downstream of the nomenclature building. The right design of permanent slope protection must be determined in a limited time. Geotechnical investigations such as boring, resistivity survey, standard penetration test, and water pressure test were conducted in a short time. Back analysis method was carried out to find extreme soil parameters conditions. The slope protection must meet the national standard minimum safety factor or greater than 1.5. Safety factors of slope protections are evaluated by a finite element method to get the safety factor and maximum total displacements. Every stage of slope protection can give the optimal safety factor values which are required or greater than 1.5, however backfill material will give more load and decrease the safety factor value.
Rock Mass Characterization and Slope Stability Analysis Inlet Portal of Jragung Dam Diversion Tunnel, Indonesia
Authors: Bagyo Mulyo Anggoro , Gde Budi Indrawan I , Anggara Ferian 
Published: August 2024

Abstract
Slope stability is a serious problem that academics are still looking into in terms of human safety, equipment, and structures along the slope. Failure on slopes happens for a variety of reasons, including rock physical and mechanical properties, discontinuity factors, slope geometry, and external variables like as rainfall and seismic activity. The research location was conducted on the Jragung dam diversion tunnel, administratively located in Candirejo village, Pringapus sub-district, Semarang, Central Java Province. The purpose of this study was to use an empirical and numerical method to investigate the impact of rock mass categorisation on slope stability. The RMR (Rock mass rating) method is used to characterize rock mass, and the SMR (Slope mass rating) method is used to measure slope stability. The numerical slope stability analyses were carried out with the help of Phase2 (Rocscience, Inc.). The results showed that the slope at the intake portal was class IV (poor), and that it was unstable utilizing the SMR technique. According to numerical research, the basic design cut slopes with a 51° inclination were found to be unstable even after strengthening. It was suggested that the slope geometry and support measures be adjusted even more. Modified cut slopes were found to be stable after the slope inclinations were changed from 51° to 27° and shotcrete and rock bolt reinforcement were added.