bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation on surface integrity of Inconel 718 in cryogenic cutting compared with dry cutting and coolant cutting
Authors: Zhang Xiaoxia , Li Jianming , Qiao Yang , Wang Xiangyu 
Published: February 2025

Abstract
As a type of high-strength, thermally resistant nickel-based alloy, Inconel 718 has found extensive application in the aerospace industry. To meet the immediate demands for excellent surface integrity in engineering practices, Streamlined manufacturing process for Inconel 718 has become an unavoidable trend. The influence of various cutting parameters and cooling conditions on the surface integrity is studied through single factor cutting test. Results show that a higher cutting speed, lower feed rate, and smaller cutting depths can obtain better machined surface under the same cooling conditions. With consistent cutting parameters, cryogenic cutting can result in reduced surface roughness, lower surface residual stress, and increased microhardness, effectively enhancing surface quality. The findings demonstrate that cryogenic cutting has a favorable machining effect and a promising future, warranting greater attention.
Research on thermal insulation technology of aerospace cryogenic propellant tank
Authors: Yu Bin , Huang Cheng , Wang Tian , Zhao Jipeng , Ma Tianju , Gu Sendong , Chang Xin , Wu Zihao , Chen Linfeng 
Published: February 2025

Abstract
In this paper, the thermal insulation layer, thermal insulation support, and metal interface of the cryogenic tank are taken as the research objects, and the structural design, heat transfer mechanism analysis, heat transfer calculation model establishment, heat transfer calculation and result analysis, and temperature field numerical simulation of the cryogenic tank are studied. The heat transfer mechanism of Spray-On Foam Insulation (SOFI)/Varied Density Multi-Layer Insulation (VD-MLI) in the ground stage and space stage is analyzed. In the ground stage, SOFI heat conduction and radiation heat transfer between adjacent radiation layers in VD-MLI, gas heat conduction between adjacent radiation layers, and solid heat conduction between adjacent radiation layers were considered in terms of insulation layer design. In the space stage, SOFI heat conduction and radiation heat transfer between adjacent radiation layers in VD-MLI, residual gas heat conduction between adjacent radiation layers, and solid heat conduction between adjacent radiation layers were considered in terms of insulation layer design. Based on the heat transfer process of SOFI/VD-MLI in the ground stage and space stage, the heat transfer calculation model of SOFI/VD-MLI in the ground stage and space stage is established. According to the evaporation rate requirements of aerospace cryogenic propellant, the thermal insulation layer, thermal insulation support, and metal interface were optimized, which effectively controlled the heat flux density (HFD) and heat leakage (HL) of the cryogenic tank and ensured the evaporation rate index of cryogenic propellant and Zero Boil Off (ZBO) storage.
The influence of W-FSAM process parameters on mechanical properties of 6061 aluminium alloy
Authors: Liu Mengmeng , Wang Rui , Zhu Xiaohu , Li Songmo 
Published: February 2025

Abstract
The Wire Friction Stir Additive Manufacturing (W-FSAM) process is an emerging solid-phase friction stir-forming technology that combines friction stir welding technology with additive manufacturing. By generating heat through friction between the stirring head and the substrate, the material reaches a plastic state without reaching its melting point, effectively avoiding problems such as thermal stress, deformation, and uneven microstructure that may occur in traditional melt additive manufacturing. In addition, the characteristic of continuous feeding ensures an uninterrupted additive process, significantly improving production efficiency and ensuring an uninterrupted additive process when constructing large-sized parts. This study uses W-FSAM technology for additive moulding and investigates the effect of changing relevant parameters on the tensile strength of moulded parts.
Design of asymmetric quasi-zero stiffness mechanical metamaterial vibration isolators
Authors: Lu Hongjie , Meng Lixin 
Published: February 2025

Abstract
In order to improve the vibration isolation of precision optical equipment under low-frequency excitation, an asymmetric quasi-zero stiffness (QZS) mechanical metamaterial model is designed and analyzed in this paper. The model is characterized by an asymmetric QZS property of the structure under vertical loading. The structure consists of four beam structures arranged in parallel by rotating a trigonometric curve around an axis to form a spatial beam structure. The structure is first optimized, and its static characteristics are analyzed by finite element analysis. Then, based on static analysis, the structure dynamics are analyzed theoretically. The finite element is used to analyze the structure’s time-domain response under excitation, study the vibration isolation performance of the asymmetric QZS mechanical metamaterials, and compare the theoretical results. The simulation results of the transmission rate are in good agreement with the theoretical results. It is verified that the structure proposed in this paper has better low-frequency vibration isolation performance.
Study on microstructure and mechanical properties of resistance spot welded joints Of DP800/Q235 steels for automobile
Authors: Wang Min , Guo Shulan 
Published: February 2025

Abstract
In this paper, the resistance spot welding experiment of DP800/Q235 dissimilar steel with 2mm thickness was carried out. The hardness test, tensile property evaluation, and microstructure analysis of the welded joint were performed. The results show that the weld surface is well formed, the heat input increases, and the core diameter increases. The microstructure of the molten core zone is lath martensite, ferrite, and a small amount of Weissner structure; the HAZ on the DP800 side is martensite, ferrite, and a small amount of Weissner structure; and the HAZ on the Q235 side is martensite and ferrite. When the process parameters are 9kA, 32cyc, and 0.4MPa, the maximum tensile shear is 18.30kN, and the fracture mode is ductile or mixed ductile and brittle fracture. The hardness of the weld core zone is the highest, and the hardness of the heat-affected zone decreases.
Measurement of anisotropic elastic constants of glass fiber reinforced resin matrix composite laminates
Authors: Li Peng , Wang Shenbiao , Fan Baijia , Zhao Yuan , Yu Shenglin 
Published: February 2025

Abstract
Aiming at the measurement of anisotropic elastic constants of glass fibre reinforced resin matrix composite laminates, the study was conducted to prepare glass fibre reinforced resin matrix composite specimens by using a vacuum-assisted resin transfer moulding process. Based on the electrical measurement method, a mechanical test platform was set up to conduct tensile and shear tests, and the tensile elastic modulus E, shear elastic modulus G, and Poisson’s ratio μ of the composite laminates were measured, which provide a research basis for the design and optimization of subsequent composite structures.
Study on the properties of PLA/PBAT/MMT composite materials modified with silane coupling agent KH570
Authors: Zhong Yanhui , He Tingting , Kuang Jialin , Ye Tingtao , Su Jiahong 
Published: February 2025

Abstract
With the increasing attention to environmental protection and sustainable development, biodegradable plastics have become a research hotspot. PLA (polylactic acid) and PBAT (polybutylene terephthalate adipate) are two widely used biodegradable polymers, but their individual use is limited by performance defects, which restrict their application scope. To prepare high-performance PLA and PBAT composites, this study used montmorillonite (MMT) as a reinforcing filler, silane coupling agent KH570 as a surface modifier, and chain extender ADR-4468 as a compatibilizer to investigate the comprehensive properties of PLA/PBAT composites. Through research, it was found that when the addition amount of silane coupling agent KH570 is 0.75% of the filler, the comprehensive performance of the composite material is optimal, with a tensile strength of 17 MPa, elongation at break of 20.75%, bending strength of 369.06 MPa, bending modulus of 4, 269.90 MPa, notch impact strength of 4.5 kJ/m2, and melt flow rate of 17 g/10 min. A biodegradable composite material with good processing and mechanical properties is prepared.
Study on thermal oxidation modification of carbon felt electrode based on flow battery
Authors: Wang Xizhe , Zhao Haitao , Zhao Hui 
Published: February 2025

Abstract
Thermal oxidation of the carbon felt electrode for vanadium redox flow batteries (VRFBs) modifies it. The investigation focuses on how the structure and functionality of the electrode are affected by the length of thermal oxidation. The improved electrode’s make-up, structure, and electrochemical properties are analyzed using techniques such as X-ray diffraction, scanning electron microscopy, contact angle measurements, specific surface area analysis, cyclic voltammetry, and electrochemical impedance spectroscopy. The results show that with the extension of oxidation time, the specific surface area of the original carbon felt is 0.187 m2/g, and the specific surface areas of the samples treated at 500°C for 6 hours and 9 hours are 4.353 m2/g and 5.746 m2/g respectively. The contact angle of the original carbon felt is 143.034°, the sample treated at 500°C-6 hours is completely wetted, and the closed area of the CV curve measured by cyclic voltammetry is the largest.
Frequency domain spectroscopy characteristics of oil-impregnated paper bushings with radial and axial nonuniform moisture distribution
Authors: Su Zhicheng , Zhang Yiyi , Su Yi , Deng Jun , Lan Danquan , Wei Wenchang , Wang Lei , Goh Hui Hwang 
Published: February 2025

Abstract
Oil-impregnated paper (OIP) bushings are essential equipment for connecting transformer windings and external busbars, and the damp state of their insulating paper is a critical factor in determining safe and stable operation. In recent years, frequency domain spectroscopy (FDS) technology has continually been utilized to evaluate the damp state of bushings. However, existing FDS studies mainly focus on uniformly damped OIP bushings, with limited research on the nonuniform moisture states of bushings. Therefore, this article predicts FDS dates of bushings with various nonuniform moisture distributions to analyze the impact of moisture levels and the wettest region’s position on the FDS curves. The research results indicate that with the increase in average moisture and the wettest point’s outward movement, complex relative permittivity’s real and imaginary components increase, with the average moisture content playing a dominant role. This study provides guidance for the nonuniform moisture condition assessment and wettest area localization of the OIP bushings.
The effect of palladium element on the performance of gold-based friction pairs in slip rings
Authors: Fu You , Guo Zhijun , Li Chunda 
Published: February 2025

Abstract
A slip ring is an electrical connector that enables signal and power transmission between the stator and rotor. This experiment explores the effect of adding palladium element on the electrical and frictional properties of gold-based friction pairs in slip rings. The results indicate that the gold-based friction pairs in slip rings with added palladium element have an improvement in wear resistance. The wear rate of the brush wire with the added palladium element decreased by 4.0% compared to the brush wire without the addition. By improving the wear resistance, the electrical performance of the gold-based fiction pair with added palladium element was significantly improved compared to the fiction without added palladium element at the same number of turns.
Topology optimization design of continuous body structures with single-phase materials
Authors: Liu Zhuchun , Liu Zhen 
Published: February 2025

Abstract
The effective utilization of materials and the optimization of structural performance have become important research topics. In this context, the technique of topological optimization emerges as a potent approach to refine the geometrical configuration and structural layout under specified limitations, with the goal of attaining superior functionality. The present study predominantly centers on the utilization of topological optimization, which is enhanced by the modification of feasible regions in the realm of single-phase materials. Firstly, a topology optimization model for single-phase materials is established, aiming to minimize compliance under the constraint of structural volume. A sub-model of this model is proposed based on the feasible region adjustment scheme. Subsequently, leveraging the moving asymptote method for approximating the expansion of the objective function, we derive an approximation of the second-order derivative of the objective function. This derivative is then subjected to a convexity treatment to ensure the robustness of the optimization process. By integrating the primary derivative of the objective function, a quadratic Taylor series approximation for the objective function is formulated. The issue is addressed by employing a smooth dual-solution approach. Ultimately, a series of validation cases are showcased to demonstrate the effectiveness of the method. This method not only effectively improves material utilization and structural performance but also provides a new optimization approach for engineering design.
Electrochromic properties of nanostructured WO3 thin films deposited on ITO/PET substrate modified by Pt sputtering
Authors: Zhao Ziyue , Wang Meihan , Qiao Xue 
Published: February 2025

Abstract
To enhance the electrochromic(EC) properties of WO3 thin films, The ITO/PET substrate was modified with Pt sputtering. Subsequently, nanostructured WO3 thin films were deposited on the modified substrate via DC magnetron sputtering at a glancing angle of 80°. FE-SEM was employed to examine the surface/cross-sectional morphology of the WO3 thin films. The films’ electrochemical and optical characteristics were tested using an electrochemical workstation and a UV-visible spectrophotometer. The results revealed that the WO3 thin films have a porous nano-columnar structure. The sputtering of Pt makes the WO3 thin film dense. The ion diffusion rates were determined to be Din=6.64×10−12 cm2/s and Dde=7.06×10−12 cm2/s, respectively. The optical modulation amplitude was found to be 36%, and the coloring efficiency was 10.60 cm2C−1. The coloring and bleaching response time was corresponding to tc=9.4 s and tb=10 s. The sputtering process of Pt needs to be further optimized to find feasible parameters to enhance the EC properties of the WO3 thin films.
Analysis and prediction of water resources consumption: A case study in Yiwu city, China
Authors: Fu Lei , Wang Junmin , Wang Shiwu , Wang Helong , Hu Guojian 
Published: February 2025

Abstract
In this study, analysis and prediction of water resources consumption is executed in order to alleviate the water shortage problem especially in Southeast China. Nowadays, lots of Chinese cities suffered from the water shortage and the water environment pollution for decades. The demand of high quality fresh water resource becomes critical for both the urban and rural area due to the fast development of the economic and the rapid growth of the local population. Hence, the calculation and prediction of the water resource for the current the future year in a typical Chinese city is focused in order to allocate the water resource more efficiently and predict the water demand and water supply in the future. It is also valuable for different cities especially the cities suffered from water around the world.
Preparation of amino acid-based polyesteramides and study on poly-ε-caprolactone/amino acid-based polyesteramides fiber film
Authors: Bai Lu , Hu Mingguang , Li Xiaojian , Liu Nan , Zhou Haijun , Zhang Fen , Li Yantao , Chen Xiaoqi 
Published: February 2025

Abstract
A series of PCL/AA-PEAs nanofibrous films with different amino acid-based polyesteramides contents were successfully synthesized by interfacial polymerization using L-phenylalanine, 1,3-propanediol, and sebacic dichloride as the main raw materials and complexed with poly-ε-caprolactone. A series of PCL/AA-PEAs nanofibrous films with different amino acid-based polyesteramide contents were prepared using electrostatic spinning technology. The effects of different ratios on the performance of the fibrous films were investigated. The results show that with the increase of the dosage of amino acid-based polyesteramide, the tensile strength of the PCL/polyesteramide fiber film firstly increases and then decreases, the glass transition temperature increases and the dosage is 70/30, the diameter of the PCL/polyesteramides fiber film is 309-684 nm, the tensile strength reaches a maximum of 5.2±0.9 MPa, and the Tg is 31.5°C which is lower than the human body temperature 37°C.
Identification and regulation of catalytic active sites on material surface
Authors: Lu Shuqi 
Published: February 2025

Abstract
In order to explore the identification and regulation of active sites on catalysts, various high-resolution characterization techniques combined with theoretical calculations were used to conduct an in-depth analysis of active sites on the surfaces of different types of catalytic materials. Through techniques such as X-ray photoelectron spectroscopy, scanning tunneling microscopy, and atomic force microscopy, the active sites of various catalysts were successfully identified, and their electronic and geometric structures were analyzed. The results indicate that the structural characteristics of active sites are closely related to catalytic performance, and precise regulation of these sites can significantly improve catalytic efficiency. In addition, the developed in-situ characterization technology provides new possibilities for real-time monitoring of catalytic processes, opening up new paths for designing and optimizing efficient catalysts.
Bimetallic MOF doped with reduced graphene oxide enables rapid detection of chloramphenicol
Authors: Pan Youheng , Zhang Tianyi , Li Lanlan 
Published: February 2025

Abstract
A broad-spectrum antibiotic called chloramphenicol (CAP) stops the creation of bacterial proteins, which stops bacteria from growing and reproducing. When chloramphenicol is misused, it can cause major side effects, secondary infections, bacterial resistance, delays in effective treatment, and higher treatment costs. As a result, creating an electrochemical sensor that is quick and sensitive is crucial. The electrocatalytic activity of CAP determination was enhanced in this work by producing reduced graphene oxide doped bimetallic organic framework (Fe/Al-MOF/rGO) nanocomposites in a single pot, which had more active sites and better electrical conductivity. The constructed sensor has a linear range of 20 - 1600 μM and a detection line (LOD) of 1.5 nM (S/N=3). Furthermore, the sensor’s recovery rate for sample detection is good enough.
Synthesis and optical properties of novel Tm3+ doped Gd3BWO9 blue phosphors
Authors: Luan Ruixin , Tian Xiaoxia , Miao Zheng 
Published: February 2025

Abstract
The synthesis of blue luminous phosphors doped with Tm3+ and Gd3BWO9 was achieved using a high-temperature solid-state process. Their degree of purity and optical characteristics were extensively examined. Results indicated an optimal Tm3+ doping concentration of 0.05 mol. Electro-multipolar interactions were deemed the mechanism behind concentration quenching in Gd3BWO9 materials. Additionally, Gd3BWO9:0.02Tm3+ exhibits blue fluorescence with color coordinates (0.1727, 0.0832), suggesting its suitability as a blue component in w-LED fabrication.
Exposure to compound climate hazards transmitted via global agricultural trade networks
Authors: Keys Patrick W , Barnes Elizabeth A , Diffenbaugh Noah S , Hertel Thomas W , Baldos Uris , Hedlund Johanna 
Published: February 2025

Abstract
Compound climate hazards, such as co-occurring temperature and precipitation extremes, substantially impact people and ecosystems. Internal climate variability combines with the forced global warming response to determine both the magnitude and spatial distribution of these events, and their consequences can propagate from one country to another via many pathways. We examine how exposure to compound climate hazards in one country is transmitted internationally via agricultural trade networks by analyzing a large ensemble of climate model simulations and comprehensive trade data of four crops (i.e. wheat, maize, rice and soya). Combinations of variability-driven climate patterns and existing global agricultural trade give rise to a wide range of possible outcomes in the current climate. In the most extreme simulated year, 20% or more of the caloric supply in nearly one third of the world’s countries are exposed to compound heat and precipitation hazards. Countries with low levels of diversification, both in the number of suppliers and the regional climates of those suppliers, are more likely to import higher fractions of calories (up to 93%) that are exposed to these compound hazards. Understanding how calories exposed to climate hazards are transmitted through agricultural trade networks in the current climate can contribute to improved anticipatory capacity for national governments, international trade policy, and agricultural-sector resilience. Our results highlight the need for concerted effort toward merging cutting-edge seasonal-to-decadal climate prediction with international trade analysis in support of a new era of anticipatory Anthropocene risk management.&#xD;
Dynamical large deviations of the fractional Ornstein-Uhlenbeck process
Authors: Valov Alexander , Meerson Baruch 
Published: February 2025

Abstract
The fractional Ornstein-Uhleneck (fOU) process is described by the overdamped Langevin equation

x
˙

(
t
)
+
γ
x
=

2
D

ξ
(
t
)

, where

ξ
(
t
)

is the fractional Gaussian noise with the Hurst exponent

0
<
H
<
1

. For

H
≠
1

/

2

the fOU process is non-Markovian but Gaussian, and it has either vanishing (for

H
<
1

/

2

), or divergent (for

H
>
1

/

2

) spectral density at zero frequency. For

H
>
1

/

2

, the fOU is long-correlated. Here we study dynamical large deviations of the fOU process and focus on the area

A
n

=

∫

−
T

T

x
n

(
t
)

d

t

,

n
=
1
,
2
,
…

over a long time window 2T. Employing the optimal fluctuation method, we determine the optimal path of the conditioned process, which dominates the large-An
tail of the probability distribution of the area,

P

(

A
n

,
T
)
∼
exp
⁡
[
−
S
(

A
n

,
T
)
]

. We uncover a nontrivial phase diagram of scaling behaviors of the optimal paths and of the action

S
(

A
n

≡
2

a
n

T
,
T
)
∼

T

α
(
H
,
n
)

a
n

2

/

n

on the (H, n) plane. The phase diagram includes three distinct regions: (i)

H
>
1
−
1

/

n

, where

α
(
H
,
n
)
=
2
−
2
H

, and the optimal paths are delocalized in time, (ii) n = 2 and

H
⩽

1
2

, where

α
(
H
,
n
)
=
1

, and the optimal paths oscillate with an H-dependent frequency, and (iii)

H
⩽
1
−
1

/

n

and n > 2, where

α
(
H
,
n
)
=
2

/

n

, and the optimal paths are strongly localized. We verify our theoretical predictions in large-deviation simulations of the fOU process. By combining the Wang-Landau Monte-Carlo algorithm with the circulant embedding method of generation of stationary Gaussian fields, we were able to measure probability densities as small as 10−170. We also generalize our findings to other stationary Gaussian processes with either divergent, or vanishing spectral density at zero frequency.