bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel network training approach for solving sample imbalance problem in Photovoltaic power prediction
Authors: Xian Zikang , Zhu Jianbin , Li Hanhong , Yin Yiding , Meng Anbo , Liu Jiawei 
Published: December 2023

Abstract
Randomness and intermittency are crucial challenges in photovoltaic (PV) power prediction. Most studies concentrate on addressing the randomness of PV power, and tend to overlook the intermittency that leads to sample imbalance, which negatively affects prediction accuracy. To address the sample imbalance, a novel approach called segment imbalance regression (SIR) is proposed. The SIR method proactively exploits the inherent imbalanced nature of samples by investigating the interactions among neighbouring samples, which leads to dynamical assigning weights. Through focused training and segmental prediction, SIR selectively retains the outside information while focusing segment inside, which enhances the gradient descent process and ultimately leads to improved training performance. With crisscross optimization (CSO), SIR demonstrates its performance sufficiently with an average RMSE reduction of 21.17% and 40.76% in the multi-step prediction and day-ahead prediction cases, respectively.
Evaluation and prediction of the life of vulnerable parts and lithium-ion batteries in electrochemical energy storage power station
Authors: Shao Jian , Sun Lei , Guo Dongliang , Xiao Peng , Yin Kangyong 
Published: December 2023

Abstract
The widespread application of renewable energy technology and changes in energy structure has led to changes in the structure and operation of traditional power grids. Electrochemical energy storage systems have gradually achieved commercial operation due to their high energy density, efficient energy conversion, and renewability. This article proposes a life assessment plan for vulnerable parts, conducts statistical analysis on the life data of vulnerable parts, and provides calculation methods for average life, reliability, and reliable life. Then, the residual capacity of lithium-ion is estimated by using electron dispersion spectroscopy, and a dual exponential capacity decay model is established. Finally, the residual life of lithium-ion is estimated through an extended Kalman filter, and the capacity attenuation trend is better captured by combining with Monte Carlo sampling to improve the accuracy of the remaining useful life of lithium-ion.
Research on Optimal Configuration of Integrated Energy Storage for Source Network, Load Storage Considering Carbon Emissions
Authors: Zhan Zhiguo , Zhang Lin , Song Zhiqiang , Li Sicheng , Zhang Zaiyi , Yang Zhuo , Zhao Shilin 
Published: December 2023

Abstract
This study endeavors to construct an optimized operation model for a Combined Heat and Power Microgrid that utilizes renewable distributed power generation. The model decouples the thermoelectric connection via energy storage equipment and takes into account carbon emissions based on multi-energy complementarity. This approach offers an optimization space for the thermal and electrical production of microgrids. Numerical simulation verification demonstrates that the optimization strategy proposed in this study enhances the flexibility of the system’s energy supply and improves the operational economy. Furthermore, the study explores the optimal storage battery capacity under the integration of a specific area’s source-grid-load-storage.
Coordinated Control Strategy for System of Hydrogen Production from Renewable Energy Considering Regulating Characteristics of Electrolyzers
Authors: Guo Xiaolong , Kang Pengpeng , Zhang Jiangfei , Song Pengfei , Yang Guixing 
Published: December 2023

Abstract
As a low-carbon and clean form of energy development and utilization, renewable energy hydrogen production technology has received widespread attention. However, under traditional control strategies, the electrolyzers are generally operated at rated power, and their ability to participate in the system of hydrogen production from renewable energy and grid regulation is not fully utilized. Therefore, this article proposes a coordinated control strategy for the system of hydrogen production from renewable energy that considers the regulation characteristics of electrolyzers. Firstly, models of each unit are established, and based on this, the working characteristics of the electrolyzer are analyzed through electrolyzer model simulation. Then, control strategies for each unit were designed, and the additional response control module is added to the control strategy of the electrolyzers to alleviate the fluctuation of DC bus voltage. Finally, through analysis, this coordinated control strategy has been proven to be effective.
Independent Energy Storage AGC Instruction Allocation Method and Control Strategy Based on Typical Scenarios
Authors: Liu Mingyi , Cao Xi , Sun Zhouting , Lei Haodong , Cao Chuanzhao , Pei Jie , Li Xizhe , Yang Yinting , Zhang Jianfu 
Published: December 2023

Abstract
The large-scale new energy sources such as solar and wind energy bring challenges to system frequency regulation. With the recognition of new energy storage as an independent market entity, it is necessary to study how independent energy storage can participate in automatic generation control (AGC) command mode and control with other generators. Firstly, this paper introduces the regulation range, upper and lower regulation characteristics, and requirements of energy storage and conventional units. Secondly, the AGC control unit’s response curve to AGC instructions is reasonably simplified for calculating benefits for each entity. Then, the AGC command distribution method based on the available frequency regulation capacity is established, and an AGC control mode suitable for independent energy storage power stations is proposed to maximize the frequency regulation mileage revenue. Finally, based on three typical AGC scenarios: continuous down regulation response, continuous up regulation response, and fluctuation of up and down regulation response, four schemes—only conventional units, priority call for independent energy storage, call for energy storage based on available frequency regulation capacity, and joint frequency regulation are compared, verifying the effectiveness of the model proposed.
Investigation of Gas-liquid Separation Experiment of Electric Pump Drainage and Gas Extraction Unit in High Gas-liquid Ratio Gas Wells
Authors: Zhang Bao , Jing Hongtao , Tu Zhixiong , Cui Hangbo , Bai Xiaofei , Zhou Huaiguang , Yu Xiaotong , Fan Dabin , Xue Longlong , Liu Taochou 
Published: December 2023

Abstract
Given the prominent problem of water in the Tarim basin of China with high formation temperature and large water production, a preferred scheme of electric pump drainage and gas extraction unit for gas fields with a high gas-liquid ratio is proposed by the mechanical principle and structural design method. Then, the corresponding electric pumps were developed, and the drainage and gas extraction scheme of a permanent magnet electric pump unit with gas-liquid separation in the way of an inverted deflector is designed. Through indoor experiments simulating the downhole gas-liquid ratio environment, the gas-liquid separation ability and adaptability of the design scheme under different good conditions are verified. The results obtained demonstrate that the cable connection process can meet the requirements of high-pressure resistance (≥25 MPa), and the gas-liquid separation effect is very good in vertical wells by adopting the inverted deflector scheme. The separation effect exceeded 90% under different working conditions (production from 30 to 150 m3/day and inhalation gas-liquid ratio from 50% to 95% and even higher) in the experiment with high gas content. The results will promote the gas recovery rate of high gas-liquid ratio gas fields and improve extraction efficiency.
Rock Plate Impact Experiment Based on ANSYS Workbench
Authors: Lu Jun , Huang Jinfei , Lou Caiying , Zhao Xinze , Shang Bei , Huang Jian , Chen Min 
Published: December 2023

Abstract
The study of the physical properties of laminate mainly focuses on the static strength and elastic modulus. Its impact resistance has not attracted enough attention. However, the impact resistance of the multi-layer board used in climbing walls is particularly important to protect the safety of climbers. Using the display dynamics solver ANSYS Workbench and referring to the test method in EN 12572-1-2007, a finite element model of the rock slab impact test was established. The maximum stress and strain of each part during impact were solved, and the vulnerability point of the structure was analyzed. By changing the impact height and solving the influence on the rock slab under each test condition, the results show that the maximum stress of the slab changes nonlinearly. The numerical simulation results provide reference data and new development modes for the development of test methods and testing equipment in the next step of improving national standards.
Experimental Study on the Underwater Explosion Bubble Near deformable boundary
Authors: Su Hao-Chen , Wang Jun , Liu Yun-Long , Gao Yong-Qiang 
Published: December 2023

Abstract
Studying near-field underwater explosions is important for the research of submersible and underwater explosive weapons. In this study, we conducted experiments to investigate the coupling of near-field underwater explosion bubbles with titanium alloy plates and steel plates. Our findings show that the boundary of a titanium alloy plate causes the first pulsation period of a bubble to be longer than in the free field, while the boundary of a steel plate causes the first pulsation period of a bubble to be shorter than in the free field. Furthermore, we simulated the process of the explosion and found that changes in the period may be caused by ventilation.
Study on the influences of temperature and impact speed on the bounce behaviors of superhydrophobic surfaces
Authors: Li Bo , Bai Jie , Fan Lei , Li Yue , Yang Liuqing , Xiao Xiaobing , Xiang Huiying , Yuan Yuan 
Published: December 2023

Abstract
The freezing of water droplets greatly harms overhead conductors and other outdoor infrastructures. Superhydrophobic (SHP) surfaces are an effective and practical method of preventing ice. The SHP surfaces rapidly repel the impact water droplets before freezing. Herein, SHP surfaces with a high aspect ratio and narrow gap nanostructures were prepared on aluminum plates by anodic oxidation, and the influences of temperature and impact speed on the bounce behaviors of SHP surfaces were systematically studied. The drop in temperature delays the escape of the liquid drop on the surface and reduces the bouncing height. Notably, the SHP surface still maintains good bounce behavior at -10 °C. The prepared SHP surface can resist droplet impalement with impact velocities below 2.42 mm/s at -5 °C. This study reveals the bounce behavior of droplets on supercooled SHP surfaces, and this provides experimental guidance for the exploration of SHP in ice prevention.
The Effect of Pore Size on the Mechanical Properties of Biaxially Stretched Silver Nanoplates
Authors: Wang Shanshan , Zhang Yanan , Yang Qinyou 
Published: December 2023

Abstract
In this study, we investigate the mechanical properties of silver nanoplates with pores under biaxial stretching using energy, natural strain, and stress as characterization parameters. Furthermore, we analyze the effect of different pore radius ratios on these mechanical properties. Our analysis, using molecular dynamics methods, reveals that shear stress on dislocations leads to the destruction of the silver nanoplates model. We also found that the fracture time of silver nanoplates is affected by the pore radius ratio; models with larger pore radius ratios have smaller shear stresses and are destroyed earlier. Moreover, we observed that dislocation forms at the corners of square silver nanoplates, and as deformation increases, the dislocation gradually approaches the center of the hole. The closer the hole position is to the model boundary, the greater the shear stress will be. Finally, we demonstrate that when the hole is oval, it creates a new asymmetric dislocation line at its tip, which causes differences in mechanical properties.
Comparative Analysis of Hydrodynamic Performance of Small Wave Buoys
Authors: Zheng Shanshan , Yan Xingkui , Lei Zhuo , Zhang Jiming , Gao Saiyu , Kai Chengyu , Song Haihui , Huang Jiuzhang 
Published: December 2023

Abstract
The hydrodynamic performance of the floating body in seawater is very important. The wave buoy is a small buoy that measures wave parameters such as wave height and wave direction, for the non-powered wave buoy, the hydrodynamic performance mainly refers to the seaworthiness of the buoy body. Seakeeping refers to the motion law of the floating body in the wave. For the wave buoy, the seakeeping of the floating body has an important impact on the measurement of wave data. Therefore, the analysis of the hydrodynamic performance of the wave measurement float is an important reference for evaluating the performance of the wave buoy. In this paper, the hydrodynamic performance of cylindrical and spherical wave-finding buoys is compared and analyzed, and the influence of different structural forms on their hydrodynamic performance is analyzed, which provides a reference for optimizing the hydrodynamic performance of wave-measuring buoys.
Three-channel wide-spectrum temperature measurement technique
Authors: Yu Qiansong , Gu Shengyu , Dong Yuan , Jin Guangyong 
Published: December 2023

Abstract
A theoretical and experimental study of a three-channel wide-spectrum temperature measurement technique is reported. The correctness of the application of the Taylor series to the temperature measurement integral equations is verified theoretically, and the effect of spectral emissivity on the approximation of the Taylor series is discussed. In the simulation results, the insensitivity of the optimal expansion wavelength to the spectral emissivity is revealed and applied as an important basis in the temperature solution method. Temperature measurement experiments using the two-color method and three-channel wide spectrum method were carried out. The theoretical correctness of the three-channel wide-spectrum temperature measurement method and the spatial solution ability of the temperature field are verified.
Study on Measurement of Liquid Viscosity Coefficient
Authors: Li Xiaojie , Lv Xuyang , Yao Guangrui , Zhao Yingjie , Gao Fei 
Published: December 2023

Abstract
Based on the traditional falling ball method, the U-tube design is more suitable for measuring transparent or translucent liquids with a large viscosity coefficient. An electromagnetic relay is placed at the upper end of one side of the tube to ensure that the ball falls vertically through the axis of the tube. The other side is sealed with water to prevent the pollution of the liquid to be measured and improve the measurement accuracy. At the same time, it solves the problem of oil leakage in the existing device for a long time, which is convenient for device maintenance and cleaning.
Mixed Discontinuous Galerkin Method for One-dimensional Biharmonic Equations without Penalty Terms
Authors: Yin Jingjing 
Published: December 2023

Abstract
In this paper, we apply a discontinuous Galerkin method without penalty terms for the solution of biharmonic equations in one-dimensional space. It overcomes the trouble of choosing appropriate penalty parameters to ensure the stability of discrete problems when solving biharmonic problems by discontinuous Galerkin methods. We first introduce an auxiliary variable p = uxx
to transform the original problem into a second-order system. The variational formulation without interior penalty is derived, the well-posedness is present, and the optimal convergence rates under the energy norm and L
2 norm are obtained. Finally, several numerical findings demonstrate its accuracy and capability.
Double-Star Isolation of Maximal Outerplanar Graphs ∗
Authors: Cao Jingdong , Zhang Shumin , Ye Chengfu , Jia Tianxia 
Published: December 2023

Abstract
In the graph G = (V, E), V represents the set of vertices and E represents the set of edges. ℱ represents a family of graphs. A subset S ⊆ V is considered an ℱ -isolating set if G[V\NG[S]] does not contain F as a subgraph for all F ∈ ℱ. The ℱ-isolation number of the graph G, denoted by 𝜄(G, ℱ), is defined as the minimum cardinality of an ℱ-isolating set in G. If the family ℱ consists of a single graph H, then the subset S is referred to as an H-isolating set. The H-isolation number of the graph G, denoted by 𝜄
H
(G), is defined as the minimum cardinality of an H-isolating set in G. Maximal outerplanar graphs have been widely applied in different fields of research since 1891, where they hold significant importance. This paper aims to provide a comprehensive analysis of the H-isolation number in maximal outerplanar graphs,

ι

H

(
G
)
≤
min

{

n

2
k
+
4

,

n
+

n

2

2
k
+
5

,

n
−

n

2

2
k
+
2

}

, where H ≅ S
1,k+1,k+1.
Cyclic inequalities for generalized mixed width-integrals
Authors: Zhang Yuepu , Li Deyi , Zou Du 
Published: December 2023

Abstract
In this paper, we research the cyclic inequalities of generalized width-integral in convex geometry analysis. Based on previous studies, we use Hölder’s inequality and inverse Hölder’s inequality to study further the generalized width-integral inequalities of the convex body in Euclidean space, establish a series of cyclic inequalities, and give the condition of equality sign.
Boundary element analysis for finite-size quasicrystal plates with a hole
Authors: Wang Huiping , Wang Guixia , Chen Decai 
Published: December 2023

Abstract
The quasicrystal thermal barrier coating technology for engines is one effective means to address the energy-saving and emission-reduction issues in fuel-powered vehicles. It is noted that under loads, quasicrystal components with holes will experience stress concentration at hole edges, which can induce cracks and lead to material failure. Therefore, studying the mechanical behavior of quasicrystal defects is of great significance for improving the reliability of components. However, the boundary value problem of finite-sized icosahedral quasicrystal plates with holes is very complex and difficult to solve analytically. In the article, based on the extended Stroh method, a boundary element analysis is conducted for finite-size quasicrystal plates with a hole. Mainly, Green’s function is derived to obtain the fundamental solutions of an infinite-sized quasicrystal specimen with a hole, and linear interpolation functions and the Gauss integral formula are used to discretize integral equations. Finally, the effects of the size of the medium and the coupling elastic constant on the stress around the hole are discussed. The numerical results show that the boundary element method can be used to analyze both the finite-sized problem and the infinite-sized problem.
A New Discriminant Method for the Stability of Fourth-Order Differential Equation
Authors: Zhao Haiqing , Zhou Yuzhao 
Published: December 2023

Abstract
The stability of nonlinear differential equations has been widely studied based on various methods. In this paper, we transform a class of fourth-order differential equations into a perturbation system and study the stability and asymptotic stability of zero solutions. By utilizing Lyapunov’s second method, we give sufficient conditions for zero-solution stability and asymptotic stability and provide the construction method of the zero-solution asymptotically stable Lyapunov function of such fourth-order differential equations. In addition, this paper removes the requirement of negative definite when the general differential equation is zero solution stable and obtains a looser stability condition. This paper provides an alternative approach to the research of stability of differential systems.
Lp Dual Mixed Affine Quermassintegrals
Authors: Zheng Yanping , Li Deyi , Zou Du 
Published: December 2023

Abstract
Drawn-out dual Lp-Brunn-Minkowski inequality, some ordinary and useful characters and the uniqueness in the matter of Lp dual mixed affine quermassintegrals are discussed, and the equivalence of the inequality concerning Lp harmonic combinations, and its dual Lp- Minkowski inequality is proved.
Research on Multi-parameter Interpretation Method of Advanced Exploration of Mine Transient Electromagnetic Method
Authors: Dong Yi , Li Jingrui 
Published: December 2023

Abstract
To enrich the effective interpretation parameters of mine transient electromagnetic method (MTEM) and improve the accuracy of detection results, based on calculating the apparent resistivity and its depth of the whole period at each moment by dichotomy, combined with induced electromotive force, advanced detection fan diagrams of the apparent resistivity and the slope of the two parameters along depth direction are drawn respectively, and the imaging results of different parameters are compared and analyzed. It is found that there is an abnormal area with good roof and floor connectivity on the left side in the front of the roadway, and the four parameters have different degrees of abnormal reflection at this position. The later advanced drilling revealed that the water inflow was 12 m3/h, which verified that the multi-parameter interpretation results of the mine transient electromagnetic method were right. The above multi-parameter interpretation method for advanced exploration of the roadway not only enriches the interpretation way of the geological body but improves the accuracy of judgment of the geological anomaly body in front of the roadway.
The Integral Points on the Elliptic Curve y
2 = 7 qx(x
2 + 128)
Authors: Wan Fei , Zhao Jianhong , Wang Jihe 
Published: December 2023

Abstract
The positive integer points of elliptic curves are very important in the theory of numbers and arithmetic algebra; it has a wide range of applications in cryptography and other fields.
The main purpose of this paper is to apply elementary methods, the properties of congruence and Legendre symbols, to study the elliptic curve y
2 = 7 qx(x
2 + 128)and proved that the elliptic curve has at most three integer points when q = 5(mod8) is an odd prime number.
Study of the Mechanism of Cavitation in Inner-Hole Rotating Cavitators
Authors: Li Dawe , Wen Jiangbo , Ge Ning , Han Guihua , Zhu Yipeng , Wang Chengjun 
Published: December 2023

Abstract
To investigate the mechanism of cavitation, a mathematical model of the cavitation region and an expression for the gas volume fraction in the inner hole of a rotating cavitator are developed. Then, based on the realizable k-ε turbulence model and the Schner & Sauer cavitation model, the flow field is simulated numerically. With the help of pressure and streamlined distribution contours, velocity contours, and gas phase contours, the three stages of the cavitation process are simulated by the cavitation evolution model. Finally, the rate of heat generation is used as the experimental characterization of cavitation, and the cavitation mechanism is confirmed by experiments involving rotation speed and pressure. The results indicate that the cavitation effect can be measured by the generation of cavitation heat and that the influence of the rotation speed on the cavitation effect is more significant than that of the inlet pressure.