bluuebunny/crossref_metadata_2025_split huggingface dataset:
Curing and Failure Monitoring of Composite Material Single-Lap Joint Based on CNT/PSF Sensor
Authors: Wang Yuxuan , Cui Xiaoyu , Lu Shaowei , Ding Kaifei , Wang Ying , Zhang Lu 
Published: October 2024

Abstract
Composite bonded structures are widely used in the field of aerospace. The safety of composite structures can be ensured by the health monitoring and early warning of their whole life. In this paper, a composite CNT/PSF film sensor based on asymmetric porous PSF film was designed and prepared. Through integrated molding with epoxy film, in-situ monitoring of gel point (142.1°C) and curing time (36min) of epoxy film is realized. After optimization of curing process, tensile strength of epoxy film casting body is increased by 86.3%. The single lap shear strength of the composite is increased by 45.7%. The CNT/PSF film sensor with composite material has high response sensitivity (GF≈1.4) and linearity (0.998) to cyclic strain (0-3000με). In the shear experiment of composite single lap joint, the adhesive layer presents a typical cohesive failure mode of first compression, then tensile and finally failure. The resistance changes of CNT/PSF film sensor first decreases from 0 to -1‰, and then rises to 2.7‰. Finally, the fracture response is good, and the in-situ failure behavior monitoring of the joint can be fully realized.
Research on laser polishing process of zirconia ceramic surface
Authors: He J , Zhao Z Y , Zhou Z W 
Published: October 2024

Abstract
In order to investigate the polishing results of carbon dioxide pulsed laser on the surface of zirconia ceramics, this paper analyzes the significance of the influence of each process parameter on the surface roughness in the laser polishing process based on the experimental design of the response surface method and taking the surface roughness as the optimization objective. And the best combination of process parameters for the laser polishing process is predicted by establishing a surface roughness prediction model. The results of the experiments show that among the laser polishing process parameters, the scanning speed and laser power have an extremely significant effect on surface roughness, while the pulse frequency has a more significant effect on surface roughness. The model predicts the optimum combination of working parameters as: laser power P = 75W, pulse frequency f = 4 kHz, scanning speed v = 380 mm/s. Under the optimum combination of process parameters, surface roughness Ra = 0.595μm of the material, which is 76% lower than that of the original surface roughness of 2.479μm after laser polishing.
Generalized poisson regression for over-dispersed longitudinal count data
Authors: Liu Huaxian , Yu Jing , Su Liyun 
Published: October 2024

Abstract
Longitudinal count data is a common type of discrete data in fields like medicine and social sciences. The Poisson regression model is an important method for analysing count data, and the standard Poisson regression model requires that the mean and variance of discrete count data are equal. However, longitudinal count data are often over-dispersed in practice, i.e., the variance of the data is greater than the mean. Besides, the degree of dispersion between the mean and variance of longitudinal count data varies over time. A generalized Poisson regression model based on joint modeling of the mean and dispersion parameters of over-dispersed longitudinal count data is proposed, which simultaneously describes the trajectories of longitudinal mean and dispersion parameters over time and explains how they are dependent on other covariates. The simulation results and real data analysis illustrate the accuracy and effectiveness of the proposed method.
Comparative study on the influence of chemical reaction mechanisms on turbulent jet flame
Authors: Wang Yunfan , Jin Jie , Lai Genhong , Wang Fang 
Published: October 2024

Abstract
This paper focus on the influence of chemical reaction mechanisms on the simulation of turbulent jet flame of 11 different chemical reaction mechanisms. These mechanisms are mainly selected from GRI series and their reduced mechanisms, and their reaction kinetics were analyzed. This paper uses LES-TPDF method to simulate Sandia Flame D turbulent jet flame and then analyze the difference of time-averaged temperature, heat release rate and species concentration results in different mechanisms. The results show that the kinetic performance of different chemical mechanisms is very different. The ignition delay time of JL4, SMOOKE and z42 mechanisms are either overestimated or underestimated due to the omission of multi-carbon species and other important species. The differences of the LES results in different mechanisms increase along the axis. The differences near the fuel inlet are mainly due to the difference of kinetic performance, while the difference away from the fuel inlet is more due to the different species and elementary reactions involved in different chemical reaction mechanisms. For all chemical mechanisms, there is a tendency that the more species used in the chemical reaction, the more concentrated the region of high heat release rate, the shorter the flame length, and the higher the maximum temperature throughout the field.
Simulating the dynamics of a 2D multicomponent vesicle in time-dependent elongation flow
Authors: Liu Kai 
Published: October 2024

Abstract
This paper is concerned with the nonlinear dynamics of multicomponent vesicles in a time-dependent elongational flow. Using a nonstiff, pseudospectral boundary integral method, we investigate the dynamical patterns induced by negative surface tension and inhomogeneous bending for a two phases system. For both quasi-circular and elongated vesicles, high frequency wrinkles can be excited in flow with strong elongational rate after the flow’s direction is reversed. Unevenly distributed phase diagram leads to asymmetric wrinkling pattern, and the characteristic wavelength for each phase is well reserved. In weak flow, bucking behaviours are observed for elongated vesicles and the membrane bends inward at regions with lower bending moduli.
Measurement principle and electric field analysis of tissue equivalent proportional counter
Authors: Yuan Wang Xi , Fan Su Yang , Pan Guo Yi , Yong Wei Zhi 
Published: October 2024

Abstract
TEPC is the preferred device for measuring microdoses due to its excellent organizational equivalence and high energy response. The most important factor affecting its energy response is the electric field distribution in the avalanche region. This paper uses finite element analysis to examine the electric field distribution of a spherical structure with a sensitive area diameter of 2 cm and a cylindrical structure with a sensitive area of 2 cm × 2 cm. While the spherical structure exhibits better isotropy, it has significant distortions in the electric field at the anode wire end, making compensation optimization complex and hindering miniaturization. Cylindrical structures can compensate for the electric field by adding insulators at the anode wire end. When the insulator diameter is 3mm, the optimal protrusion length into the chamber is also 3mm. This lays the foundation for the miniaturization of TEPCs in subsequent research.
Unconventional photon blockade in a nonlinear system embedded with an atom
Authors: Wang Yuxuan , Yang Hui , Yao Zhihai 
Published: October 2024

Abstract
The unconventional photon blockade effect due to quantum interference in a second-order nonlinear system embedded with a two-level atom is studied. By performing analytical calculations, the approximate results are obtained. By solving the master equation, the numerical calculation results are also obtained. Results show that the analytical results are consistent with the numerical results, which proves that unconventional photon blockade can be realized in this system. Furthermore, the effects of the system parameters on the unconventional photon blockade are also discussed. All the results may provide useful references for experimental investigations and practical applications of single-photon devices.
A fast identification method of surface heat flux based on numerical pre-calibration and regularization
Authors: Wu Long , Wang Qi , Wang Feng , Liu Jianxia , He Yuanyuan 
Published: October 2024

Abstract
Identification of surface heat flux is a technique of retrieving heat flux from the measured temperature in an object. The inverse heat conduction problem abbreviated as IHCP is ill-posed, and its highly ill-conditioned characteristics lead to unstable numerical calculation. In this paper, we build an identification equation with the theory of linear superposition. The matrix of pulse sensitivity coefficient is established by formula for one-dimensional model. And a finite element pre-calibration approach is proposed to obtain the matrix of pulse sensitivity coefficient for complex three-dimensional structures. Regularization methods including Tikhonov method and algebraic reconstruction technique are utilized to reduce the sensitivity of measurement error. Numerical simulation shows that this method is efficient and accurate.
Research on anti-single event ability and reinforcement method of SiC MOSFET
Authors: Qin Linsheng , Wang Bo , Huang Yuhan , Ma Lindong , Liu Yuan , Ju Anan , Wang Kunshu 
Published: October 2024

Abstract
High-voltage silicon carbide (SiC) metal-oxide field-effect transistor (MOSFET) is limited by its ability to resist single event effect (SEE), so it is necessary to study its ability to resist SEE and form an effective reinforcement method. In this paper, it will be studied that how the influence of device structure on the anti-single event ability of SiC MOSFET from the irradiation experiment, and the safe working area of single event leakage degradation of the device is examined. It is found that the width of junction field effect transistor (JFET) and P- type ohmic contact interval both affect the SEE of the device. The SEE mechanism of the device is analyzed based on the experimental results. And the failure caused by local electrothermal stress concentration is confirmed. In view of this mechanism, the reinforced structure is designed with SiO2 barrier layer added in the single event sensitive area, the electrical stress is effectively alleviated, and the peak drain current is reduced by about 18%.
Uncertainty analysis method of high-speed wind tunnel standard model test results based on GUM and MCM
Authors: Du Yufeng , Wang Lulu , Zhu Jilong , Wang Weizhong , Xiong Neng , Guo Danping 
Published: October 2024

Abstract
The standard model is a standard calibration model that has a well-known geometric shape and can represent the aerodynamic layout characteristics of a certain type of aircraft. It has many functions, including evaluating the accuracy of wind tunnel test data, verifying the integrity of the wind tunnel flow field and measurement system, and developing and verifying wind tunnel test technology. Conducting wind tunnel tests using standard models is a key step in realizing the functions of standard models. However, all existing literature on standard model tests has not effectively evaluated the uncertainty of the test results, which makes it impossible to evaluate the reliability of the test results. Based on the GUM and MCM uncertainty analysis methods, this paper establishes a method for quantitatively evaluating the uncertainty of the test results of high-speed wind tunnel standard model tests through rigorous mathematical derivation, providing technical support for precisely quantifying the uncertainty of standard model test results.
Design and FEA verification of high dimensional and multi-field smart soft material
Authors: Pang Xin , Liu Anchen , Yang Guyeli , Zhu Jun , Huang Ran , Ma Xin 
Published: October 2024

Abstract
We designed a sophisticated smart soft tissue material that simulates the properties of biological soft tissue and detects three-dimensional force. Inspired by electronic skin, this material uses capacitive pressure sensors and multi-layer sensor packaging. Finite element analysis and multi-field simulation were employed for structural design and verification. The study evaluated the theory and practicality of a flexible capacitive 3D force sensor for detecting pressure and shear force. Mechanical and electrical properties were confirmed through force and electric field simulations. The 3D force detection method proved feasible, achieving sensitivity levels of 10−4
kPa
−1 in the X and Y directions, and 10−3
kPa
−1 in the Z direction, demonstrating the effectiveness of our design.
Numerical Studies of Solid Rocket Propellant PMMA-PBAN-ALF3-Nitrocellulose-Difluoramine
Authors: Srivastava Sachin , Hamshitha G. , Jagannath V. , Kothenty Gaurav , Haldar Subham , Rajendran Ajith Raj , Thapliyal Subham 
Published: October 2024

Abstract
The aim of the new investigation is the evaluation of solid rocket Propellant. In which performing numerical analysis of solid rocket propellant and calculating the constraints involved as derived from thrust i.e. velocity involved in the solid rocket propulsion motor usage. This paper aims to show the viability of solid rocket propellant for modern and future applications. Solid rocket motors are simple in design and fabricating. The need for a propellant that produces the same specific impulse as another chemical rocket engine. So it is needed to have a solid rocket motor with an enhanced combustion characteristic at a reasonable O/F ratio. For a healthy ecology, an economically reliable, highly effective, and environmentally concerned propellant is constantly suitable. As a superior alternative among the already used propellants in the sector, the paper suggested fuel PolyMethyl MethAcrylate (PMMA), PolyButadiene AcryloNitrile (PBAN) CoPolymer, and Aluminum hydride (AlH3), and oxidizers such as Nitrocellulose and Difluoramine. The desired O/F ratio for the technical criteria was found to result in a high combustion characteristic. With the features discovered through numerical and analytical research, we have suggested a design for the SRM that includes post-combustion, which enhances the reaction and creates the innovative elements of the existing SRM.
Dynamic characteristics of a flexible rotor supported on surface textured journal bearings
Authors: Srivastava Ashish , Rahmani Faisal 
Published: October 2024

Abstract
This paper presents the dynamic characteristics of a flexible rotor supported on surface textured journal bearings. Oil lubricated journal bearings exhibit the self-exited whirling of rotor, leading to instability. Understanding the threshold speed of instability is crucial in mitigating excessive vibration in rotating machinery. In this work, a simple model of a flexible rotor with central disc is studied. Modal analysis is carried out to obtain the whirl frequencies of the system, mode shapes, and stability limit speed. The addition of surface textures to the journal bearing stands out as a significant modification aimed at improving performance. Fully textured and partially textured bearing surfaces are considered in the investigation and compared with the performance of smooth journal bearings. Notably, fully textured bearings enhance stability limits. This study offers insights essential for optimizing machinery performance and minimizing operational risks.
Influence of gamma-irradiation on the physical properties of epoxy/polyaniline composites and application as gamma dosimeter
Authors: Hamad Hadeel Tariq , Mohammed Hadi Hassan , Ali Hayder Mohammed , Alwan Tariq J 
Published: October 2024

Abstract
The epoxy/pani samples doped with a specified weight ratio of polyaniline pani ware prepare by casting method. Using different doses of gamma rays (0, 2, and 4 kGy) were used to irradiated the prepared samples. Irradiated and non-irradiated samples were imaged using a FE-scanning electron microscope and were found to have regular morphology, and irradiation had obvious effect on this morphology at 4 kGy. When studying the crystal structure of the samples, it was found the samples have a polycrystalline structure, and this structure tends to improve after irradiation, this was verified using X-ray diffraction. Likewise, D.C electrical conductivity increased with increasing gamma radiation doses. Also study the effect of irradiation with gamma rays on optical properties and demonstrate the clear effect of these rays on optical properties. It was also found that the optical energy gap with (indirect allowed transition) was decreases after the irradiation process. Together, these results indicate the possibility of using these samples in the manufacture of gamma dosimeters.
An investigation into the implications of partial substitution of selenium with lead on the thermal properties for S60Se40-XPbX Chalcogenide Compound
Authors: Ghazi Mohamed Muthana , Jasim Kareem Ali 
Published: October 2024

Abstract
This study includes the manufacture of four ternary alloys represented S60Se40-XPbX with weight ratios x = 0, 10, 20, and 30 by the melting point method. The components of each alloy were mixed separately, then placed in quartz ampoules and vacuumed out with a vacuum of roger that 10−4 Torr. The ampule was heated in two stages to avoid sudden dissipation and precipitation of selenium on the inner mass of the quartz tube. The ampoule was gradually heated and kept at 450°C for approximately 4 hours followed by 950°C for 10 hours.at a rate of 10 degrees Celsius, the temperature of the electric furnace was increased, and then the ampoule was subjected to rapid cooling with cold water to reach a state of solidity glass-like. The research aims to investigate the effect of adding lead to selenium on the properties of thermal conductivity and heat flux density. It has been noted that the partial replacement of selenium with lead affected these properties significantly.
Preliminary results in the manufacture of anodic electrodes for potential use in microbial fuel cells.
Authors: Flores Segundo Rojas , Benites Santiago M. , Cruz-Noriega Magaly De La , Nazario-Naveda Renny 
Published: October 2024

Abstract
Microbial fuel cells are a bioelectrochemical technology that uses different types of waste as fuel sources to generate sustainable and environmentally friendly electricity. Various MFCs have been developed, with the electrode used being a crucial problem due to its high manufacturing cost. This research shows that electrodes can be manufactured quickly and economically using activated carbon (100 g), sugar (80 g), ethanol (250 ml), and pine resin (200 g). For its demonstration, grape waste was used in a single-chamber MFC for 35 days. The manufactured electrode generated a Rint. of 18.471 ± 2.475 Ω, whose current density was 8.348 ±0.768 mW/cm2 at a current density of 5.166 A/cm2. The electrical potential shown was 0.889 ± 0.017 V and 4.571 ± 0.061 mA, with an ORPmax of 81.495 ± 1.874 mV, operating at a pH of 7.26 ±0.19. The micrographs made by scanning electron microscopy showed porous surfaces with carbonaceous substances in the final monitoring stage. These preliminary results showed excellent performance of the electrodes, showing their potential for use in MFCs in an economical way.
Investigating optical, structural and morphological properties of CuxZn1-xS thin films
Authors: Soud Ali Jwad , Al-Maiyaly Bushra K.H. 
Published: October 2024

Abstract
CuxZn1-xS (CZS) Nano crystallized thin films with (x=0.25,0.5,0.75) were grown from alloy by thermal evaporation technique on glasses substrates at room temperature in a vacuum ∼ 2 × 10 −5 mbar with 450±20 nm thickness. The Cu content concentration effects on structure, morphology besides optically property of these films were investigated. X-ray diffraction (XRD) technique and Atomic force microscopy (AFM) were used to investigation the structural and morphological properties of CuxZn1-xS films. XRD analysis offered that these films had poly crystalline hexagonal structure with preferred orientation along (201) plane and mixed of of CuS-ZnS structure. The crystallites size changing with Cu concentration were found as (4.12, 5.5, 8.4) nm respectively. Using AFM measurements to investigate morphological properties of these films, the grain size for CuxZn1-xS films differs with Cu content thru uniform distribution. UV-Vis absorption spectroscopy was used to investigation the optical characterization of CuxZn1-xS films as a function of Cu content. The direct band gap values of these films were found decrease with increasing Cu content as (2.45, 2.4, and 2.3) eV respectively and the optical constant affected with Cu content. The CuxZn1-xS films have suitable optical characteristics which can used it for solar cell applications.
A Qualitative Method for White Phosphorus Detection in South Lebanon Soils
Authors: Karnib Mona Y , Faraj Mahmoud K 
Published: October 2024

Abstract
White phosphorus is an explosive substance mostly used to create a dense smoke screen during conflicts. When exposed to air, it burns at extremely high temperatures and starts fires in the areas in which it is deployed. White phosphorus has detrimental effects on human health, it can cause respiratory disorders, organ failure and third degree burns. Since the start of October 2023 attacks, South Lebanon villages were hit with white phosphorus bombs which caused extensive fires and loss of agricultural fields. This paper presents a rapid qualitative method to test white phosphorus presence in soil samples taken at 5 cm and 30 cm depth from 9 villages attacked by white phosphorus bombs: Naqoura, Alma Shaab, Aita Shaab, Ramiah, Beit Leif, Rmeish, Rshaf, Kafra and Yarin. Positive results were found in Naqoura, Alma Shaab, Aita Shaab, Ramiah, Beit Leif, Rmeish and Yarin, whereas for Rshaf and Kafra, no white phosphorus was detected in our soil samples. This study provides information on white phosphorus contamination in south Lebanon soils, and sheds the light on its agricultural and environmental consequences.
Methods of Thermal Energy Storage by Using Smart Heat Pumps
Authors: Török Arpad , Feidt Michel 
Published: October 2024

Abstract
To address energy problems in thermodynamic installations, the authors of the paper propose a working methodology in which the determining role of the exergetic aspects of the processes is especially emphasized. One of these energy problems, addressed in many papers in recent years, is of particular importance in the fight to reduce chemical and thermal pollution of the environment: the problem of storing excess energy and energy from renewable or residual sources. Approaching this issue as well from this point of view, the authors propose a series of solutions by which they seek to use the most of the exergy extracted from the available energy sources. The solutions proposed here are based on the use of an own invention, the isothermalizer, a particularly powerful tool, able to bring highly effective solutions to many of the problems that concern researchers determined to create a cleaner planet. Designers and users of thermodynamic systems now have the possibility of an initial choice and subsequent changes (with the change of external conditions), of their energy and exergetic efficiency, as well as the possibility of calculating the material and energy costs necessary to achieve the proposed objective. In any gas compression/expansion problem, the energy efficiency is established precisely, by choosing the isothermal speed of the process (so of the isothermal temperature), and the power density, by choosing the total surface of the thermal sponge, the flow rate and the mode of distribution of the cooling agent. As the isothermalizer is equipped with a processor that controls and modifies the isothermal speed in such a way that the exergy consumption is optimized, the energy storage processes become processes of extracting thermal energy from a tank and transferring it to another tank, a process accompanied by consumption/supply of mechanical energy.