bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical modeling to predict threshold fluence for material ejection in Laser-Induced forward transfer of metals
Authors: Muniyallappa Aanjinappa , Chandra Harish , Marla Deepak 
Published: August 2023

Abstract
Laser-induced forward transfer (LIFT) uses a pulsed laser beam to propel material from a donor (containing a glass coated with a thin material film) onto a receiving substrate, resulting in pixellated material deposition. The deposition characteristics depend on the material ejection modes that vary with film thickness and laser parameters. This study develops a computational model based on the finite volume method for LIFT of gold films using nanosecond pulses, which captures two different ejection modes for droplet depositioncap ejection and jet ejection. The model computes the temperature distribution and predicts potential ejection regimes for different film thicknesses, providing an understanding of the material removal process. Cap ejection occurs at lower laser fluences when the entire film thickness in the irradiated zone is in the molten phase. In comparison, jet ejection occurs at higher laser fluences caused by vapor pocket formation at the glass-film interface. The model predicts threshold fluences with greater than 90% accuracy for film thickness less than 583 nm. However, for the film thickness of more than 583 nm, the simulations underpredict the threshold fluence, suggesting that laser absorption by the film decreases due to vapor formation at the glass-film interface. Besides, it is observed that higher fluences can cause melting and vaporization of the glass at the interface leading to possible contamination of the deposited material. The proposed model can be used to choose the operating window for laser parameters for droplet deposition in LIFT, which otherwise is challenging using experiments.
Operational calculus for Hilfer-Prabhakar operator Applications to inverse problems
Authors: Javed Sehrish , Malik Salman A 
Published: August 2023

Abstract
Mikusiński's operational calculus has proven to be a powerful tool for tackling various fractional order differential equations. Notably, it has been extended to encompass the Hilfer-Prabhakar fractional order operator. By employing this operational calculus, we have been able to recover and connect previously derived results pertaining to the Hilfer, Riemann-Liouville, and Caputo operators. Furthermore, we address two inverse problems that involve determining space and time dependent source terms and diffusion concentration. Using our operational calculus results, we obtain series solutions for these inverse problems. It is essential to note that the inverse problems belong to the class of ill-posed problems according to Hadamard's definition. To establish the validity and uniqueness of the solutions to both inverse problems, we rigorously prove the existence and uniqueness results. Additionally, we provide specific examples of inverse problems, thereby illustrating the practical applications and versatility of the operational calculus approach.
Comprehensive analysis of relativistic embedded class-I exponential compact spheres in f(R, ϕ) gravity via Karmarkar condition
Authors: Asghar Zoya , Malik Adnan , Shamir M Farasat , Mofarreh Fatemah 
Published: August 2023

Abstract
In this article, we use the prominent Karmarkar condition to investigate some novel features of astronomical objects in the f(R, ϕ) gravity; R and ϕ represent the Ricci curvature and the scalar field, respectively. It is worth noting that we classify the exclusive set of modified field equations using the exponential type model of the f(R, ϕ) theory of gravity f(R, ϕ) = ϕ(R + α(e
β
R − 1)). We show the embedded class-I approach via a static, spherically symmetric spacetime with an anisotropic distribution. To accomplish our objective, we use a particular interpretation of metric potential (g

rr
) that has already been given in the literature and then presume the Karmarkar condition to derive the second metric potential. We employ distinct compact stars to determine the values of unknown parameters emerging in metric potentials. To ensure the viability and consistency of our exponential model, we execute distinct physical evolutions, i.e. the graphical structure of energy density and pressure evolution, mass function, adiabatic index, stability, equilibrium, and energy conditions. Our investigation reveals that the observed anisotropic findings are physically appropriate and have the highest level of precision.
Fatigue strength analysis of semi-submersible platforms based on wide-band stress
Authors: Zhou Chenyan , Zhang Yahong , Chen Ling , Wu Zhongxin 
Published: August 2023

Abstract
As the focus of ocean resource exploitation shifts from shallow sea to ultra-deep sea, semi-submersible platforms are far away from the coastline for a long time. The semi-submersible platform structure is more prone to fatigue damage under complex sea conditions. The stress range and peaks are considered in the conventional frequency domain spectral method to obey the narrow-band distribution, which makes the results of fatigue assessment tend to be conservative. To solve the problems above, a wide-band fatigue assessment method based on Rice distribution is proposed from the perspective of stress distribution. Different methods are used to solve the error functions involved in fatigue calculations to obtain different approximate equivalent stress models. Finally, the broadband fatigue analysis of a semi-submersible platform in the South China Sea was carried out under different models, and the results showed that: The error of the wide-band fatigue calculation based on Rice distribution is related to the selected equivalent stress model, and a suitable model needs to be selected according to the bandwidth coefficient of the structure. The results obtained provide a reference for the safety assessment of pipelines in service. The research provides a reference for the fatigue assessment of semi-submersible platforms under random broadband loads.
Gel-assisted Welding of Epoxy Composite with Ethylene Glycol Mixed Catalyst
Authors: Li Xiuzhao 
Published: August 2023

Abstract
Effective and high-strength welding of thermosetting composites is badly in demand and always a challenge in industrial applications. Here, a gel-assisted welding method was proposed for traditional epoxy composites using a gel of 1,5,7-triazabicyclo [4.4.0] dec-5-ene mixed with ethylene glycol (TBD/EG gel) for pretreatment. Firstly, the influence of TBD/EG gel thickness, pretreatment time, pretreatment temperature, and pretreatment after soaking for the welding strength of the epoxy composite was studied. Then, the appropriate TBD/EG gel thickness (2 mm) and TBD/EG gel pretreatment conditions (140 °C for 60 min) were obtained. Compared to the different pretreatment methods for welding, the welding of TBD/EG gel pretreatment is feasible.
Achieve hybrid energy harvesting based on the internal resonance of a two-degree-of-freedom cantilever beam
Authors: Li Yuanhua , Han Minglei , Chen Xinhai 
Published: August 2023

Abstract
Taking a cantilever beam with two-degree-of-freedom (DOF) as an example, this paper studies the energy transfer mechanism between the vibration DOF and the rotation DOF, proposes a hybrid energy harvesting scheme, establishes the dynamic equation and solves it. Through the simulation of the analytical equation, it is found that under the condition of internal resonance of two DOFs, the two nonlinear peaks on the rotation DOF are very conducive to energy harvesting in the wide frequency domain. Furthermore, the influence of excitation amplitude, electromechanical coupling coefficient, time domain constant and other parameters on the resonance frequency and amplitude response of the energy harvesting system is studied.
Detection of TNT wastewater by the molecular imprinted porous membrane
Authors: Ma Baohong , Du Xuefeng , Li Zhenkai , Shao Yusong 
Published: August 2023

Abstract
In this paper, the preparation scheme of TNT molecularly imprinted porous film and the scheme of TNT identification and detection in wastewater are designed by means of molecular imprinting technology. The molecularly imprinted porous film material was prepared by the self-assembly method, and the TNT residue adsorption was detected by a UV-visible spectrophotometer. The concentration of TNT waste liquid was calculated by absorbance, and the effect of the deviation of ultraviolet spectra of different contents of TNT waste liquid was discussed. The results show that the molecularly imprinted films have high adsorption and specific recognition effect on TNT, which can be used for rapid and sensitive detection of TNT in the waste liquid.
Study on Effect of Hot Rolling Process Lubricant on Rolling Force and Thickness of Q235A Strip Steel
Authors: Tian Yuting , Li Yan , Lei Xia , Li Qihang 
Published: August 2023

Abstract
Taking the Q235A plate and strip as the research object, hot rolling experiments were carried out under different concentrations and compositions of hot rolling process lubricants, and the effect of different lubrication conditions on the rolling effect of the Q235A plate was studied. The experimental results show that the processing lubricant used for 3 # and 4 # samples has the best effect, and the thickness of the steel plate rolled with 10% lubricant is thinner than that with 5% lubricant. When the concentration of lubricant is 10%, the maximum reduction of the third pass rolling force is 24.4%. The rolling force with oil lubrication is 21% lower than that without oil lubrication.
Experimental Study on the New Type of Connecting Nodes of Prefabricated Stairs Using Flexible Grouting Material
Authors: Zhang Shoufeng , Huo Wenying , Liu Ke , Yao Yuan , Sun Qiang 
Published: August 2023

Abstract
In recent years, prefabricated buildings have been developing positively in China. Prefabricated concrete stairs are widely used in prefabricated concrete buildings because of their quick construction, convenient handling, reduced cost, and premium appearance. They also have promising application potential in cast-in-place concrete structures and steel buildings. The stairs are important escape routes during earthquakes and play the role of “safety islands.” Therefore, the study on the seismic performance of connecting nodes of prefabricated concrete stairs is significant. For a new flexible-hinge connecting node of the prefabricated stairs with flexible grouting material (FGM), the low-frequency cyclic loading test is carried out in this paper to study the stress performance of the end nodes of the stairs under in-plane and out-of-plane low-frequency cyclic loading. The results show that the new flexible-hinge connecting nodes of the prefabricated concrete stairs have moderate bearing capacity and stiffness, which can mitigate the effect of diagonal bracing under small and medium earthquakes and dissipate energy to a certain extent.
Preparation of Mesoporous γ-Alumina from Red Mud Waste
Authors: Gao Tianyi , Zhong Li 
Published: August 2023

Abstract
In this paper, a novel green and cost-effective synthesis method in this field is presented. Mesoporous γ-alumina was obtained by inorganic in situ crystallization, and sodium aluminate as an aluminum origin was abstracted from red mud. The influence mechanism of the reactant ratio of NaHCO3 to NaAlO2, the reaction temperature and the concentration of the template was systematically investigated. As indicated by the results, the obtained mesoporous γ-alumina possesses extensive specific surface areas, narrow pore size distribution, nearly spherical particle morphology and wormlike structure pores. This green and economical synthesis method can be used for the preparation of alternative mesoporous or various porous materials as well.
Deterioration of metal and paper caused by camphor wood: a noticeable phenomenon in conservation
Authors: Shen Jingyi 
Published: August 2023

Abstract
Although welcomed and used as storage materials by many museums, camphor wood shows a potential risk to museum collections due to its strong smell. Camphor wood was proved harmful to metals in the author’s previous studies, but since the last study about camphor wood reported by the author, the camphor wood samples have not experienced the Oddy test again for two years, so their harm to metals is unknown at the current stage. Meanwhile, there is no standard or specific method for learning the materials’ effect on organics. The present work focuses on the above situation. Camphor wood samples of different species and aged for different years were tested in this study. Their effect on metals was assessed by performing the Oddy test. On the other hand, a series of mechanical tests were conducted to learn the camphor wood samples’ effect on paper samples commonly used in Chinese calligraphy and painting and the corresponding restoration. The results show that the camphor wood samples are still significantly volatile and harmful to both metal and paper. This work would be meaningful to museum curators and conservators as a reference for making correct judgments when camphor wood is included in the potential material list.
The influence of initial imperfection on ultimate bearing capacity of cylindrical shells with continuous openings
Authors: Yu Banhai , Leng Wenjun , Liu Yong 
Published: August 2023

Abstract
Four kinds of initial imperfections were analyzed to obtain their influence on ultimate bearing capacity of cylindrical shells with continuous openings. The model was created in the finite element program. After the calculation of the nonlinear ultimate bearing capacity of cylindrical shells with continuous openings considering different kinds of initial imperfection and their amplitudes, the failure mode of the structure was studied and the buckling pressure was achieved. Compared with FEM and experimental results, it is proved that the numerical method used in this paper is reliable and could accurately forecast the ultimate bearing capacity of cylindrical shell with continuous openings.
Study on the seismic model of a special shelf structure
Authors: Li Shitu , Wu Tingwei , Bai Yujie , Jia Xiangyu 
Published: August 2023

Abstract
In this paper, the shelf structure is discretized, reduced in order, examined, and studied for seismic response by using the concentrated mass method, Lagrange method, transfer function method, and fourth-order Runge-Kutta method based on MATLAB numerical calculation. A simplified model of special equipment including supporting frame structure is proposed, and the calculation methods of equivalent mass, stiffness, and damping of supporting frame structure are given. In addition, the seismic response time-history curve of each position of the shelf structure is quickly obtained by using the lumped mass method in this paper. The conclusion is that the seismic response of the upper floor is greater than that of the lower floor, and the seismic response of the middle position of the same floor is greater than that of both sides. This paper provides a research foundation for the follow-up work. Research in this paper verifies the rationality of simplifying the complex dynamic model of the shelf structure continuum into a simple basic model, which provides a simplified model with a high fitting for the follow-up rub-impact analysis and research, and greatly improves the calculation efficiency.
Large-area WS2 Deposited on Sapphire and Its In-Plane Raman and PL Spectral Distributions
Authors: Wei Xiaoyu , Tang Zijun , Liu Chenxu , Zhu Huili , Zhou Changjie 
Published: August 2023

Abstract
Large-area and high-quality WS2 monolayer has been fabricated on the Al2O3 substrate. Three typical WS2 configurations were adopted to examine the in-plane spectral properties. For the triangle WS2 monolayer, the PL light region exhibits a large peak wavelength and could be deduced to be the relaxation of the compressed strain of the WS2 monolayer and the low defect density. For triangle WS2 monolayer with multilayer WS2 on center, combining the peak intensity and position results of PL and Raman spectra, the line traces near the side of the center triangle can be demonstrated to be the defects or dislocations due to the exist of the central multilayer WS2. For large-area WS2 monolayer with crystal domain, PL area integrated mapping shows a uniform light region across the whole surface, except the existing dark crystal domain boundary. The dark line traces could be attributed to compressed strain in the WS2 monolayer due to the formation of the WS2/Al2O3 hybrid structure. The in-plane PL and Raman spectra and mapping exhibited in this work reveal the distribution of stress and defects in this system and further clarify the effects of stress and defects on the optoelectronic properties of WS2 monolayer on Al2O3.
Propagation and attenuation of stress waves in heterogeneous elastic rods
Authors: Xie Suteng , Ru Yan 
Published: August 2023

Abstract
In this paper, the propagation and attenuation of stress waves induced by an integrable external load in an elastic rod with multiple inclusions are investigated. The traveling wave method is suggested for obtaining the reflection coefficient, transmission coefficient, and attenuation coefficient of the wave propagating from one media to another. Furthermore, the effects of wavelength and the size of inclusion on elastic wave propagation are calculated by the finite element method. The results show that the theoretical solution is fitted well with the finite element numerical results. The attenuation coefficient is influenced by material parameters, wavelength, and the number of inclusions. The smaller wavelength or more inclusions will incur the more obvious attenuation phenomenon. Moreover, the reflection coefficient and transmission coefficient are affected by the acoustic impedance ratio of the matrix and the inclusion. The results of this paper can be served as the theoretical basis for the study of wave propagation in heterogeneous materials.
Suppression of axial vibration of satellite antennas using the self-resetting frictional damper
Authors: Zhang Yunfei , Wang Min , Gao Xiangsheng , Gao Peng , Wang Guicheng , Che Changjia 
Published: August 2023

Abstract
In order to solve the problems of low-profile accuracy and poor control stability of the satellite antenna due to axial coupling vibration, in this paper, a self-resetting friction damper is proposed to suppress axial vibration. Firstly, a self-resetting friction damper, with a lightweight, wide frequency band, and high energy consumption, is designed. The principle of dry friction energy loss of metal rubber (MR) and the effect of self-resetting of shape memory alloy (SMA) are used. Secondly, the vibration reduction mechanism model of the self-resetting friction damper is established, and the principle of damping energy dissipation is analysed. Finally, sinusoidal excitation tests of the components of the satellite antennas with self-resetting friction dampers are carried out. The axial vibration loss factor of the components of the satellite antenna with the self-resetting friction damper is calculated, and the vibration resistance performance of the damper is verified. Theoretical analysis and experimental results show that the self-resetting friction damper has a significant effect on suppressing the axial vibration of the components of the satellite antenna. It is feasible to install a self-resetting friction damper in the components of the satellite antenna to suppress the axial vibration.
The contact condition of viscoelastic contact problems
Authors: Wang Fansheng 
Published: August 2023

Abstract
Three contact states in the viscoelastic contact deformation area between the rigid cylinder and the viscoelastic foundation are discussed based on various material mechanical properties between the rigid and the viscoelastic materials. On this basis, the relationship model between the node displacements and the node stresses in the boundary contact area is established, and the corresponding numerical analytical algorithms are used to simulate the viscoelastic contact deformation. Meanwhile, an example is given to simulate the contact deformation of the conveyor belt.
Abnormal Vibration Test and Cause Analysis of Bogie Brake Test Stand
Authors: Xue Mingchen , Wang Ruiqi 
Published: August 2023

Abstract
In this paper, the abnormal vibration of the bogie brake test stand during its operation is tested and analyzed. The vibration test and modal test were carried out for the test stand, and the radial runout test was carried out for the wheels of the bogie and the rollers of the test stand. By analyzing the results of the stability test, modal test, and Fourier transform method, the time-frequency spectrum of the bearing pedestal is obtained. The degree of the wheel polygon is obtained by analyzing the wheel out of roundness through the radial runout test results. The comprehensive comparison test results show that the coupling between the polygonal frequency of the wheel and the modal frequency of the bearing pedestal of the test stand leads to vibration amplification, which is also the main reason for abnormal vibration. Finally, some suggestions are put forward to improve the abnormal vibration.
Microstructure characterization and crystal plastic finite element simulation of additive manufacturing 316 L stainless steel
Authors: Huang Ziyang , Zeng Guowei 
Published: August 2023

Abstract
Due to the layer-by-layer molding mode of additive manufacturing (AM) technology, the mechanical properties of additive manufacturing structural parts are very different from those of traditional structural parts. The macroscopic mechanical properties of additive structural parts show obvious anisotropy; thus, the macroscopic model is not suitable to describe the effect of material microstructure (grain distribution, initial grain orientation, etc.) on the macroscopic mechanical behavior. Setting up a simplified structure microstructure of representative volume element (RVE), and the mechanical behavior response of AM 316 L stainless steel is simulated based on the finite element method for crystal plasticity. While uniaxial tension was regarded as a typical loading, the effect of microstructure on macroscopic mechanical properties is analyzed in combination with grain distribution and grain orientation. The results show that the numerical model not only reflects the impact of microstructure on macroscopic mechanical behavior but also suggests theoretical advice for practical production.
Evaluation of Carbon Reduction Potential and Economic Performance of Photovoltaic Charging System for Campus Electric Bicycles
Authors: Pan Jinjun , Xia Peng , Ma Xiang 
Published: August 2023

Abstract
This study considers the roof characteristics of different types of buildings in the Yuntang campus of Changsha University of Science and Technology, and evaluates the overall potential for photovoltaic power generation and carbon reduction performance of the campus by simulating the roof solar radiation at multiple time scales. In addition, a photovoltaic charging system for electric bicycles suitable for the campus is proposed based on the usage of electric bicycle charging stations on campus. The Monte Carlo method is used to simulate the hourly probability distribution of the charging load, and the capacity of the photovoltaic charging system is optimized by integrating the simulated solar radiation, outdoor temperature and other data, in order to strengthen the relationship between electricity demand and energy supply of the campus.