bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mathematical analysis of a time-fractional coupled tumour model using Laplace and finite Fourier transforms
Authors: Munir Sadia , Omame Andrew , Zaman Fiazud Din 
Published: January 2024

Abstract
A time-fractional diffusive tumour growth model is investigated in this paper. The model assumes two different tumour populations having diverse diffusion and proliferation rates. The classical integer model, coupled with the fractional operators with power-law, Mittag-Leffler and exponential kernels is solved analytically with the help of integral transforms Numerical investigations of the resulting solution are carried out to examine the effect of the different fractional operators. The spherical form of the model is considered, as this describes the tumour more adequately as compared to other coordinates system. From the numerical experiments, it is observed that, the kernel contained in the respective fractional operator could alter the dynamics of the tumour concentration under consideration.
The Mass Assembly History for Galaxies with MaNGA
Authors: Ge Xue , Wang Hong-Tao , Lei Cheng-Long , Guo Yun-Jun , Jiang Yi-Long , Cao Xiao-Xiao 
Published: January 2024

Abstract
How galaxies assemble masses through their own star formation or interaction with the external environment is still an important topic in the field of galaxy formation and evolution. We use Value Added Catalogs with galaxy features that are spatially and temporally resolved from Sloan Digital Sky Survey Data Release 17 to investigate the mass growth histories of early-type galaxies (ETGs) and late-type galaxies (LTGs). We find that the mass growth of ETGs is earlier than that of LTGs for massive galaxies (M
* > 1010
M
⊙), while low-mass (M
* ≤ 1010
M
⊙) ETGs have statistically similar mass assembly histories as low-mass LTGs. The stellar metallicity of all massive galaxies shows a negative gradient and basically does not change with time. However, in low-mass galaxies, the stellar metallicity gradient of elliptical galaxies is negative, and the stellar metallicity gradient of lenticular and spiral galaxies evolves from positive to negative. ETGs are not all in a high-density environment, but exhibit mass dependence. As the tidal strength increases, the star formation rate of low-mass ETGs rapidly decreases. These results support a picture where massive galaxies exhibit inside-out quenching mode, while low-mass galaxies show outside-in quenching mode. Environmental effects play an important role in regulating the mass assembly histories of low-mass ETGs.
Lobe-dominated γ-Ray Emission of Compact Symmetric Objects
Authors: Gan Ying-Ying , Zhang Hai-Ming , Yang Xing , Gu Ying , Zhang Jin 
Published: January 2024

Abstract
The γ-ray emitting compact symmetric objects (CSOs) PKS 1718–649, NGC 3894, and TXS 0128+554 are lobe-dominated in the radio emission. In order to investigate their γ-ray radiation properties, we analyze the ∼14 yr Fermi/LAT observation data of the three CSOs. They all show the low luminosity (1041–1043 erg s−1) and no significant variability in the γ-ray band. Their γ-ray average spectra can be well fitted by a power-law function. These properties of γ-rays are clearly different from the γ-ray emitting CSOs CTD 135 and PKS 1413+135, for which the γ-rays are produced by a restarted aligned jet. In the L

γ
− Γ
γ
plane, the three CSOs are also located at the region occupied by radio galaxies (RGs) while CTD 135 and PKS 1413+135 display a similar feature to blazars. Together with a similar radio emission property to γ-ray emitting RGs Cen A and Fornax A, we speculate that the γ-rays of the three CSOs stem from their extended mini-lobes. The broadband spectral energy distributions of the three CSOs can be well explained by the two-zone leptonic model, where their γ-rays are produced by the inverse Compton process of the relativistic electrons in extended regions. By extrapolating the observed Fermi/LAT spectra to the very high energy band, we find that TXS 0128+554 among the three CSOs may be detected by the Cherenkov Telescope Array in the future.
Evaluation of the relativistic redshift in frequency standards at KRISS
Authors: Lee Jisun , Kwon Jay Hyoun , Park Chang Yong , Kim Huidong , Choi In-Mook , Chung Jin Wan , Lee Won-Kyu 
Published: January 2024

Abstract
Relativistic redshift correction should be accurately considered in frequency comparisons between frequency standards. In this study, we evaluated the relativistic redshift at Korea Research Institute of Standards and Science (KRISS) using three different methods, depending on whether the approach was traditional or modern or whether the geopotential model was global or local. The results of the three methods agreed well with one another, and the height of an Yb optical lattice clock (KRISS-Yb1) was determined to be 75.15 m with an uncertainty of 0.04 m with respect to the conventionally adopted equipotential surface

W
0

CGPM

, the value of which is defined to be 62 636 856.0 m2s−2. Accordingly, the relativistic redshift of KRISS-Yb1 was evaluated to be 8.193(4) × 10−15. These data are applicable to the frequency standards at KRISS, one of which regularly participates in the calibration of the International Atomic Time.
Analysis of Structural Strength and Fatigue Life Based on the 7075-T651 Aluminum Alloy Lugs
Authors: Tong Dihua , Hu Benrun , Chen Bo , Li Jichen , Di Jun , Wang Hongda , Zhou Song , Yang Wenjun 
Published: January 2024

Abstract
As an important component for transmitting concentrated loads, lugs are susceptible to static strength damage and fatigue damage due to the high frequency of loads. In this paper, the finite element model of a typical 7075-T651 aluminum alloy lugs is established by considering the actual structure parameters and working conditions. Co Mparing with numerical simulation and test results in different parameter lugs, it is found that the load-displacement curve and fracture pattern are in good agreement, which verifies the accuracy of the established finite element model. Then the effects of thickness, aperture and extruded projected area are further discussed on structural strength and fatigue life of the lugs. The results show that the increase of thickness and extruded projected area can effectively reduce the maximum stress of the lugs and improve their fatigue life. With the increase of ear aperture, the maximum stress decreases initially and then increases, and fatigue life changes accordingly. The comprehensive optimal value is obtained when the aperture of the lug R is 7.5 mm. This research provides a theoretical basis for structural design of typical aircraft lugs in engineering practice.
Effect of Processing Parameters and Heat Treatment on Selective Laser Melted Al-Cu-Mg-Ag Alloy
Authors: Liu Donglin , Li Xiwu , Li Yanan , Zhu Kai , Wen Kai , Li Zhihui , Zhang Yongan , Xiong Baiqing 
Published: January 2024

Abstract
Selective Laser Melting is a promising manufacturing method for complex geometric fabrication. However, the 2xxx series aluminum alloy is facing a poor SLM-processibility problem. In this paper, the impact of the processing parameters of Selective Laser Melting on the formability of Al-Cu-Mg-Ag alloys was discussed. The evolution of precipitation under different aging treatments was explored. During the formation process, samples with a laser power of 360 W and a scanning velocity of 1150 mm/s showed a smaller defect fraction. Direct aging (DA) and solid solution treatment aging (STA) treatments were carried out on the alloy respectively. In the DA treatment, the element content in the matrix was consumed as the formation of the primary phase, and the precipitate-strengthening effect was weakened. Solid solution treatment enables a higher hardness of heat-treated samples, as well as an accelerated aging response.
Influence of Carbon Nanotubes on the Mechanical Properties of PLA/MWCNTS Printed Parts in FDM Process
Authors: Zhang Zhen , Ma Zhiyong , Gao Zhenkai 
Published: January 2024

Abstract
This study systematically and comprehensively investigates the 3D printing process and mechanical properties of PLA/MWCNTS composite material using pneumatic extrusion. Mechanical test specimens were prepared utilizing a pneumatic extrusion 3D printing system, followed by conducting mechanical performance tests. The study focuses on assessing the influence of different material ratios on the strength of these specimens, employing a controlled variable method with varied printing paths. The results demonstrate a significant improvement in the mechanical properties of PLA printed specimens upon the addition of carbon nanotubes, indicating the promising potential of PLA/MWCNTS composite materials as functional materials for FDM technology.
Evaluation of Ultimate Axial Strain Models for Fiber-Reinforced Polymer-Confined Concrete Cylinders
Authors: Chen Junwei , Wang Yong , Zhang Yafeng , Liang Meng 
Published: January 2024

Abstract
Fiber-reinforced polymer (FRP) composite has been widely applied to reinforce and rehabilitate concrete columns in civil engineering. It is necessary to deeply understand the ultimate deformation (i.e., the ultimate axial strain εcc
) of FRP-confined concrete columns. A large database including different types of FRP (conventional FRP and large-rupture-strain FRP), concrete compressive strengths (19.4 MPa-169.7 MPa), and cylinder sizes (51 mm-508 mm), as well as various concrete types, is collected in this study. For this reason, several existing ultimate axial strain modes for FRP-confined cylinders have been evaluated via some statistical parameters based on the database. The verification results illustrate that the prediction accuracy of axial strain models is not good enough due to the intrinsic difficulty in predicting deformation and variability of data source, although the available models with better performance can achieve the average ratio between experimental and predicted strain value (

ε

c
c

exp
e

/

ε

c
c

pred

) below 10%.
Preparation and Application of Environmentally-Friendly Copolymer Filtration Control Agent Based on Hydrogen Bonding
Authors: Wu Xiaohua , Zhang Zhen , Lu Haiying , Luo Xiao , Li Chengli , Li Qiang 
Published: January 2024

Abstract
Traditional water-based drilling fluids encounter challenges in terms of poor solubility in high-density water-based drilling fluids and difficulty in meeting biotoxicity standards when using heat-resistant polymers as filtration control agents. To address this issue, this study introduces MIL-100 (Fe)-NH2 type MOF due to its excellent catalytic activity, which activates industrial-grade large-sized lignosulfonate sodium. The particle size of lignosulfonate sodium is reduced from micrometer to nanometer scale, significantly enhancing its reactivity in polymerization reactions. The activated lignosulfonate sodium is then used as a raw material and reacted with acrylamide, 2-acrylamido-2-methylpropane sulfonic acid, and catechol to produce a novel polymer filtration control agent named PTASL. Biotoxicity tests demonstrate that both pre-aged and post-aged PTASL exhibit EC50 values exceeding 30,000 mg/L, indicating that they are environmentally friendly polymers with no biotoxic effects.
Simulation and Analysis of the Coupling of Hydrodynamics, Water Quality, and Aquatic Ecology in the Three Gorges Reservoir Area under Various Water Diversion Scenarios
Authors: Chen Liang , Nan Linjiang , Guan Wenhai , Fan Xiangjun , Yang Mingxiang , Huang Yubo , Wang Xu , Dong Ningpeng , Wang Hejia 
Published: January 2024

Abstract
Large-scale water diversion has, to a certain extent, altered the hydrological conditions in the water discharge area, disrupting the long-established hydrological consistency and, in turn, impacting the ecological environment. In this study, we utilized satellite imagery and underwater topographic data of the Three Gorges Reservoir Area (TGRA) to construct a coupled hydrodynamic-water quality-aquatic ecology model based on MIKE21. We simulated and analyzed the water environmental conditions at two crucial sections, Cuntan and Wanzhou, under different water diversion scenarios. The research findings indicate that under both short-term and long-term water diversion scenarios, the pollution levels at both sections have increased, with pollutant concentration varying between 0 to 0.0217 mg/L and 0 to 0.0642 mg/L throughout the year. Long-term water diversion has a more significant impact than short-term diversion, particularly with a longer duration of influence during the winter. The impact of water diversion on water quality classification is not very pronounced. It primarily reduces the number of days when Class I water quality is achieved. Under short-term and long-term water diversion scenarios, the proportion of days with Class I water quality at the Cuntan and Wanzhou sections decreased by 0.28% and 0.55%, and 0.56% and 0.83%, respectively. These research results can serve as a theoretical foundation for further developing ecological risk mitigation strategies and establishing an eco-friendly inter-basin scheduling model.
Spatiotemporal Changes of Evapotranspiration in Cities along the Yellow River Basin in Shandong Province from 2000 to 2018
Authors: Liu Yi , Gao Fei 
Published: January 2024

Abstract
Steapotranspiration is an important component of land surface water circulation and surface energy balance. The study of the spatial and temporal change of the cities along the Yellow River basin in Shandong Province is conducive to explore the regional water circulation and the response of the river basin to climate change. Based on the evapotranspiration data, the spatiotemporal distribution and change characteristics of evapotranspiration in cities along the Yellow River basin in Shandong Province from 2000 to 2018 were analyzed. The results show that (1), the mean value of evaporation in the Yellow River in Shandong Province from 2000 to 2018 was 469.43 mma-1, with large annual variation; (2) high in spring and summer, low in autumn and winter; (3) the highest spatial distribution in July; (5) the decreasing in Jining, Heze, Taian, Zibo, Jinan, Dongying, Liaocheng, Binzhou and Dezhou; and (6) increasing in eastern cities along the Yellow River; the decrease in the west.
Exploring magnetic polylactic acid composites using combined sol-gel and co-blending methods for developing 3D printing filament
Authors: Ding Haoran , Je Seungwoo 
Published: January 2024

Abstract
In this paper, we experimented to determine the ideal ratio of magnetic properties/PLA composites for creating magnetic filaments for FDM 3D printing. To achieve this, we created 15 samples using the control variates method, analyzing factors such as the type of material used, the powder size of the magnetic substance, and PLA pellet size. Also, Our approach utilized a novel method of combining the sol-gel and co-blending methods to produce uniform and high-induced magnetic field strength properties in the magnetic substance/PLA binary composites. By comparing Maximum tesla measurement results, we determined that using NdFeB is preferable to Fe3O4 in our particular conditions. We found that the composites’ magnetic properties depend only on the materials and mass ratio of the magnetic substance, with the ideal ratio being 2: (4-6): 8 for binders, magnetic substances, and PLA, respectively. Finally, based on our findings, we produced a sample filament and suggested possible applications.
Tensile behavior of martensite + ferrite micro-layered 15CrMo steel plates
Authors: Zhao X , Wang X H , Bai H Y , Cui S Y 
Published: January 2024

Abstract
Martensite + ferrite micro-layered plates were prepared by the process of quenching and cold rolling of 15CrMo steel. The tensile behavior of the micro-layered plate was tested by an electronic tensile testing machine and then simulated by a finite element software. The results show that: (1) The martensite + ferrite micro-layered structure plate is obtained by quenching and more than 50% cold rolling of 15CrMo steel, which has two characteristics: martensite + ferrite micro lamellar structure parallel to the plate surface and delamination tensile fracture; (2) The tensile strength of cold-rolled specimens are inversely proportional to the layer thickness of martensite + ferrite; (3) The tensile fracture surface of cold-rolled specimens appears the delamination phenomenon.
Microstructure characteristics and impact properties of high nitrogen steel and its weld seam
Authors: Zhan Y , Cao Y H , Zhang W H , Yang L , Zhao H Y , Yin Z Q 
Published: January 2024

Abstract
The impact friction and wear treatment of high nitrogen steel base metal and its weld under different welding currents was carried out by TIG welding process. The characteristics of hardness distribution, wear resistance and impact strengthening performance of high nitrogen steel and its weld area under different welding currents were studied. The results show that the hardness of high nitrogen steel base metal after impact strengthening treatment increases by 8.96 %, and the increase of weld hardness after impact strengthening treatment decreases with the increase of welding current. The impact strengthening effect of the base metal is more obvious, and its wear weight decreases with the increase of the impact times. Due to the loss of nitrogen under the action of welding heat, there is no obvious law of weld weight loss.
Study and application of joint assessment model for construction risk of Xiangxi Yangtze River Bridge
Authors: He Lin , Liang Guanting , Ti Yanchi 
Published: January 2024

Abstract
Closure of main arch rib is the key process of steel box girder arch bridge construction. The way to achieve quantitative and accurate prediction of closure error risk remains to be studied in depth. Taking the construction risk model of closure of main arch rib of Xiangxi Yangtze River Bridge as an example, firstly, the causal relationship between prior data and closure error of main arch rib is considered to construct Bayesian network topology; Further, the central limit theorem (CLT) is used to update the prior distribution of the parent nodes in the network using dynamic multi-source monitoring data; Then the finite element analysis and BP neural network are combined to reproduce the corresponding relationship between the arch rib closure error and the influencing factors. Finally, the probability distribution is determined by the Monte Carlo method, and the quantitative prediction of the joint construction risk error is realized. The analysis data shows that the risk probability of arch rib vertical error of Xiangxi Yangtze River Bridge is transmissible, and the risk level of arch rib closure error reaches Grade IV when it is 75∼125mm. Therefore, the prestress of anchor cable, tower buckle offset and local temperature should be closely monitored during construction. The calculated value of the joint prediction model of construction risk is consistent with the actual closure control error trend of the project, which can provide reference for the prediction and regulation of related bridge construction risks.
Construction risk analysis of cantilever casting mid-span closure of bridge in reservoir area
Authors: Liang Guanting , Chen Qirong , Li Ruijie 
Published: January 2024

Abstract
In order to assess the impact of frequent microseismic and cyclic water flow forces on the bridge cantilever casting construction in the Three Gorges reservoir area, a limited element-quantum-orthogonal experimental design-neural network-Monte Carlo simulation method was used to analyze the risk assessment of the construction. The orthogonal experimental design method is utilized to generate probability distribution samples of water velocity, water height, and microseismic acceleration. These samples are then combined with a finite element model and trained using a BP neural network. This approach aims to establish a nonlinear mapping relationship between each control parameter and the axial deviation value in the mid-span closure, and then the Monte Carlo simulation is used to generate the random influence parameter, which can be substituted into the trained BP neural network to predict the risk of the error in the mid-axial deviation. The results suggested that the risk probability of the medial axis deviation of the closure section due to the coupling effect of water flow force and high-frequency microseismicity had reached 5.06%, and the risk of line deviation of the cantilever casting construction of the bridge in the reservoir area needed to be paid sufficient attention and prevented. The risk of line deviation of the cantilever casting construction of the reservoir bridge needs to attract enough attention and precaution.
A simulation study on mechanical properties and heat conductivity of magnesium matrix syntactic foams before and after heat treatment
Authors: Fu X M , Li G Q , Chen L , Lou H R , Chen S Y , Xiang C C 
Published: January 2024

Abstract
Environmental pollution and energy consumption problems today are seriously affecting people’s lives. In this paper, a new magnesium AZ31B matrix syntactic foam (MMSF) prepared by gravity penetration with hollow alumina microspheres as reinforcement was simulated using ANSYS Workbench for the lightweight design of vehicles. The mechanical properties and heat conductivity of MMSFs prepared by hollow microspheres with different diameters and volume fractions before and after heat treatment were investigated using finite element analysis. The simulation results showed that the MMSF prepared by hollow microspheres with a diameter of 3.6 mm and a volume fraction of 40% had the best mechanical properties and heat conductivity after heat treatment strengthening. Due to low density, high strength, excellent thermal insulation and other advantages, this high-performance MMSF is suitable for making vehicle bodies, which can effectively reduce the overall weight, thus reducing the fuel consumption and pollutant emission caused by driving.
Effect of Yb3+ concentration on the spectroscopic properties of Er3+/Yb3+ co-doped SiO2-TiO2 nanofiber
Authors: Razali Nurul Syaheera , Supardan Siti Nurbaya , Yunus Rozan Mohamad , Kamil Suraya Ahmad 
Published: January 2024

Abstract
Er3+ has been gaining much interest due to the multiple emissions in both infrared and visible regions. Based on the previous study, SiO2-TiO2 have been proven to be an excellent host for Er3+. However, Er3+ exhibits a low absorption cross-section when doped into the silica-based host. Therefore, Yb3+ has been introduced into the matrix and acts as a sensitiser to increase the luminescence intensity. Er3+/Yb3+ co-doped 75SiO2-25TiO2 nanofiber with different Er3+/Yb3+ ratios were fabricated via the sol-gel electrospinning method. The FESEM result shows the diameter of the nanofibers in the range of 62 to 515 nm. The absence of any peak within the 3000-4000 cm-1 range in the FTIR spectra indicates the complete removal of the OH group. The XRD results imply that all samples were amorphous. The PL spectra showed strong green emission peaks, which were ascribed to 2H11/2
→
4I15/2 as well as red emission peaks attributed to 4F9/2
→
4I15/2 Er3+ transitions. The PL intensity was varied according to the Yb3+ concentration. The addition of Yb3+ was proven to aid the increment of PL intensity. Nevertheless, the PL intensity reduced when too high of Yb3+ concentration was used due to the concentration quenching effect.