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Grain boundary-induced stress localization during compression deformation of polycrystalline 316L stainless steel 多晶 316L 不锈钢压缩变形过程中晶界诱发的应力定位
IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-09 DOI: 10.1007/s00339-024-08033-1
Zhanfeng Wang, Sai Tao, Ting Jian, Beibei Jiang

Understanding the mechanisms governing stress localization in polycrystalline materials is paramount for optimizing their mechanical properties and performance. Here, we investigate the grain boundary-induced stress localization phenomenon during compression deformation of polycrystalline 316L stainless steel through a combination of experimental and computational approaches. Utilizing a custom-built indentation setup and crystal plasticity finite element (CPFE) simulations, we elucidate the intricate interplay between microstructural features, dislocation mechanisms, and stress distribution. Experimental results reveal significant stress concentrations at grain boundaries, while CPFE simulations demonstrate the influence of grain size on stress response, with finer grains exhibiting higher stresses due to increased accumulation of geometrically necessary dislocations (GNDs). Our findings underscore the critical role of microstructural features, particularly grain boundaries and grain size, in governing the mechanical behavior of polycrystalline materials under compression loading conditions. This study provides valuable insights for designing and optimizing materials for various engineering applications.

要优化多晶材料的机械特性和性能,了解其应力局部化机制至关重要。在此,我们结合实验和计算方法,研究了多晶 316L 不锈钢压缩变形过程中晶界诱发的应力局部化现象。利用定制的压痕装置和晶体塑性有限元(CPFE)模拟,我们阐明了微结构特征、位错机制和应力分布之间错综复杂的相互作用。实验结果表明晶界处存在明显的应力集中现象,而 CPFE 模拟则证明了晶粒尺寸对应力响应的影响,由于几何必备位错(GND)的积累增加,较细的晶粒会表现出较高的应力。我们的发现强调了微观结构特征,尤其是晶界和晶粒尺寸,在控制多晶材料在压缩加载条件下的机械行为方面的关键作用。这项研究为设计和优化各种工程应用材料提供了宝贵的见解。
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引用次数: 0
Soft drug epidemic in deterministic and stochastic case studies 确定性和随机案例研究中的软性毒品流行问题
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-09 DOI: 10.1007/s12043-024-02845-9
Islam M Elbaz, M A Sohaly, H El-Metwally

Through the application of mathematical epidemiology principles, the formulation of the soft drugs model is established, and the complete dynamics of this deterministic model are contingent upon the crucial parameter called the basic reproduction number, denoted as (R_{0}^{d}). The stochastic soft drug epidemic models are developed by considering the parametric and non-parametric stochastic perturbation techniques. Dynamics of the two different stochastic models are determined using the analog stochastic thresholds (R_0^{s_{1}}), (R_0^{s_{2}}), respectively. Introducing suitable Lyapunov functionals enables us to establish sufficient axioms for the extinction and permanence of soft drug users in both deterministic and stochastic models. Moreover, the sensitivity of the deterministic and stochastic thresholds to some important parameters involved in the models is illustrated. For the verification of our theoretical results, we develop some numerical simulations using the Euler–Maruyama scheme.

通过应用数学流行病学原理,建立了软毒品模型的表述,该确定性模型的完整动态取决于称为基本繁殖数的关键参数,表示为 (R_{0}^{d})。通过考虑参数和非参数随机扰动技术,建立了随机软毒品流行模型。两种不同随机模型的动力学分别使用模拟随机阈值 (R_0^{s_{1}})、(R_0^{s_{2}})来确定。引入合适的 Lyapunov 函数使我们能够在确定性模型和随机模型中为软性毒品使用者的消亡和永久性建立充分的公理。此外,我们还说明了确定性和随机性阈值对模型中一些重要参数的敏感性。为了验证我们的理论结果,我们使用 Euler-Maruyama 方案进行了一些数值模拟。
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引用次数: 0
A comprehensive analysis of anisotropic stellar objects with quadratic equation of state 具有二次状态方程的各向异性恒星物体的综合分析
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-09 DOI: 10.1007/s12043-024-02846-8
Kiran Pant, Pratibha Fuloria

The present investigation examines the behaviour of compact relativistic objects characterised by static and spherically symmetric space–time for neutral anisotropic matter distribution. More specifically, we consider an equation of state (EoS), in which density and radial pressure are connected with each other quadratically. By smoothly matching the interior space–time with the exterior at the stellar surface, the appropriate values of the constant parameters for physically realistic solutions are obtained to model various compact stars. We explore the physical behaviour of compact stellar models SMC X-4, Vela X-1, CEN X-3, PSR J1614-2230, LMC X-4 and EXO 1785-248. Further, we describe several features of the compact stellar systems that exhibit physically acceptable attributes with no singularity. All important stability criteria, such as the energy conditions, causality conditions, Buchdhal condition and the adiabatic index are fulfilled by our neutral anisotropic compact star models. An in-depth comprehension of the physical characteristics of the proposed solution has been achieved through meticulous analytical and graphical examinations. By utilising this solution, the masses and radii of six compact stellar candidates mentioned above are optimised with the observed values obtained experimentally. The derived solution might be useful to enhance the understanding of the strong-field regimes and self-gravitating entities.

本研究探讨了中性各向异性物质分布的静态球对称时空下紧凑相对论物体的行为。更具体地说,我们考虑了一个状态方程(EoS),其中密度和径向压力相互之间是二次连接的。通过将内部时空与恒星表面的外部时空平滑匹配,我们获得了物理现实解的适当常量参数值,从而为各种紧凑型恒星建模。我们探讨了紧凑型恒星模型 SMC X-4、Vela X-1、CEN X-3、PSR J1614-2230、LMC X-4 和 EXO 1785-248 的物理行为。此外,我们还描述了紧凑型恒星系统的几个特点,它们表现出物理上可接受的属性,没有奇点。我们的中性各向异性紧凑恒星模型满足所有重要的稳定性标准,如能量条件、因果关系条件、布赫达尔条件和绝热指数。通过细致的分析和图形检验,我们深入理解了所提出解决方案的物理特性。利用这一方案,上述六颗紧凑型候选恒星的质量和半径与实验观测值进行了优化。推导出的解决方案可能有助于加深对强场机制和自引力实体的理解。
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引用次数: 0
Impact of gold and silver nanoparticles on the thermally radiating MHD slip blood flow within the stenotic artery using stability analysis and entropy optimisation 利用稳定性分析和熵优化,研究金纳米颗粒和银纳米颗粒对狭窄动脉内热辐射 MHD 滑动血流的影响
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-09 DOI: 10.1007/s12043-024-02840-0
Gopinath Mandal, Dulal Pal

The main aim of this investigation is to study the heat transport and entropy generation of human blood as a hybrid nanofluid (HNF) containing gold (Au) and silver (Ag) nanoparticles inside a Darcy–Fochheimer porous stenotic artery in the presence of thermal radiation and magnetic field. The primary reason for adopting Au and Ag nanoparticles as nanomaterials for drug delivery is because they exhibit potential drug transport and imaging properties for treating stenosed artery. Furthermore, velocity slip and convective boundary conditions at the surface of the artery are considered in this study. A method of suitable similarity transformations has been utilised to convert the partial differential equations (PDEs) into dimensionless ordinary differential equations (ODEs) and using the bvp4c built-in solver in MATLAB mathematical software, numerical solutions have been obtained. The plots of the results show that the hybrid nanofluid (Au–Ag/blood) has greater thermal conductance than the normal nanofluid (Au/blood). The temperature and velocity of the blood gradually increase as the percentage of nanoparticles in the blood flow grows. The heat transference rate increases with increase in Biot number (Bi) and radiation (Nr) effect, which helps in removing the toxic plaque from the artery. Due to the contraction of the artery, dual solutions are found, but dual solutions cannot be found beyond the critical values of suction (S) and shrinking ((lambda )) parameters. The critical values (S_C) from computation are 1.5851, 1.5949 and critical values (lambda _C) are 0.652, 0.781 for Au/blood nanofluid (NF) and Au–Ag/blood hybrid nanofluid (HNF), respectively. Also, the stability of blood flow is achieved by finding the lowest eigenvalue. A positive minimum eigenvalue ((beta _1)) denotes the upper stable solution branch, whereas a negative minimal eigenvalue indicates the bottom unstable solution branch. The entropy of the blood as the HNF flow was found to increase with nanoparticle volume fraction ((phi _1, phi _2)), porous parameter (P) and magnetic parameter (M). These results will help greatly to avoid brain stroke or heart attack caused by the burst of an artery.

本研究的主要目的是研究在热辐射和磁场作用下,人体血液作为含有金(Au)和银(Ag)纳米粒子的混合纳米流体(HNF)在达西-福赫海默(Darcy-Fochheimer)多孔狭窄动脉内的热传输和熵产生。采用金纳米颗粒和银纳米颗粒作为给药纳米材料的主要原因是,它们在治疗狭窄动脉方面具有潜在的药物传输和成像特性。此外,本研究还考虑了动脉表面的速度滑移和对流边界条件。利用适当的相似变换方法将偏微分方程(PDE)转换为无量纲常微分方程(ODE),并使用 MATLAB 数学软件中的 bvp4c 内置求解器获得数值解。结果图显示,混合纳米流体(Au-Ag/血液)的热导率大于普通纳米流体(Au/血液)。随着纳米粒子在血流中所占比例的增加,血液的温度和速度也逐渐增加。热传导率随着比奥特数(Bi)和辐射(Nr)效应的增加而增加,这有助于清除动脉中的有毒斑块。由于动脉收缩,双解被发现,但双解不能超过吸力(S)和收缩((lambda ))参数的临界值。计算得出金/血纳米流体(NF)和金-金/血混合纳米流体(HNF)的临界值(S_C)分别为1.5851和1.5949,临界值(lambda _C)分别为0.652和0.781。此外,血流的稳定性是通过寻找最低特征值来实现的。正的最小特征值((beta _1))表示上层稳定解分支,而负的最小特征值表示下层不稳定解分支。研究发现,随着纳米粒子体积分数((phi _1,phi _2))、多孔参数(P)和磁参数(M)的增加,HNF流动时的血液熵也随之增加。这些结果将大大有助于避免因动脉破裂引起的脑中风或心脏病发作。
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引用次数: 0
Stefan blowing impact and chemical response of Rivlin–Reiner fluid through rotating convective disk 里夫林-莱纳流体通过旋转对流盘时的斯特凡吹袭和化学反应
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-09 DOI: 10.1007/s12043-024-02836-w
Kotha Gangadhar, T Sujana Sree, Abderrahim Wakif, K Subbarao

The present investigation of the rotating disk system is highly significant due to its many applications, such as in fluid thermal reactors, regulating fluidic systems and fluid stirring. Subject to the upper functions of the rotating disk, the Stefan blowing into the three-dimensional Reiner–Rivlin (R–R) fluid flow by the rotating disk affect the vertical direction. Thermal radiation and Cattaneo–Christov (CC) energy diffusion effects are examined into considering energy transport. The chemical reaction is accommodated in the concentration equation. The convective boundary conditions are considered in the disk surfaces. The ensuing nonlinear systems are determined by applying the Bvp4c routine along with the shooting method. The obtained outcomes are shown graphically with physical justification. The results show that R–R parameters cause a downturn in the radial and tangential velocity profiles as well as the temperature field. The curves of the temperature profile enhance with higher values of radiation parameter. Although this radiation falls onto the fluid surface and increases the temperature of the liquid as hot particles collide with cold particles, the skin friction coefficients decrease with suction. However, the heat and mass transfer rates are enhanced. The current model has been validated by comparing the simplified version of the investigation to a previously published article and a close agreement has been found.

由于旋转盘系统在流体热反应器、流体系统调节和流体搅拌等方面应用广泛,目前对其进行的研究意义重大。受旋转盘上部功能的限制,由旋转盘吹入三维莱纳-里夫林(R-R)流体流的斯特凡会影响垂直方向。在考虑能量传输时,研究了热辐射和卡塔尼奥-克里斯托夫(CC)能量扩散效应。在浓度方程中考虑了化学反应。圆盘表面考虑了对流边界条件。随后的非线性系统是通过应用 Bvp4c 例程和射击法确定的。得到的结果以图形显示,并附有物理证明。结果表明,R-R 参数会导致径向和切向速度曲线以及温度场下降。温度曲线随着辐射参数值的增大而增强。虽然这种辐射落在流体表面,并在热颗粒与冷颗粒碰撞时提高了液体温度,但表皮摩擦系数会随着吸力的增加而降低。然而,传热和传质速率却得到了提高。通过将研究的简化版本与之前发表的一篇文章进行比较,对当前模型进行了验证,结果发现两者非常接近。
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引用次数: 0
Neutron transfer in 7Li+205Tl system 7Li+205Tl 系统中的中子转移
IF 2.6 3区 物理与天体物理 Q2 PHYSICS, NUCLEAR Pub Date : 2024-11-09 DOI: 10.1140/epja/s10050-024-01436-x
Prasanna M., V. V. Parkar, V. Jha, S. K. Pandit, A. Parmar, A. Shrivastava, K. Mahata, K. Ramachandran, R. Palit, Bhushan Kanagalekar, B. G. Hegde

Neutron transfer cross sections for 7Li+205Tl system were measured near Coulomb barrier energies using online (gamma )-ray detection technique. One neutron stripping, two neutron stripping, and one neutron pickup cross sections have been extracted and are compared with the Coupled Reaction Channel (CRC) calculations. The systematics of one and two neutron stripping and pickup cross sections with a 7Li projectile on several targets show an approximate universal behaviour. A comparison of integrated neutron transfer cross sections with complete and incomplete fusion cross sections available with 7Li projectile is presented to understand the systematic behaviour. The neutron transfer along with cumulative sum of complete and incomplete fusion was found to explain the estimated reaction cross section in 7Li+205Tl system.

利用在线伽马射线探测技术在库仑势垒能量附近测量了 7Li+205Tl 系统的中子转移截面。提取了一个中子剥离、两个中子剥离和一个中子拾取截面,并与耦合反应通道(CRC)计算结果进行了比较。在多个目标上使用 7Li 射弹时,一个和两个中子剥离和拾取截面的系统性显示出近似的普遍行为。比较了中子转移综合截面与 7Li 射弹的完全和不完全聚变截面,以了解其系统性。发现中子转移与完全和不完全聚变的累积总和可以解释 7Li+205Tl 系统中的估计反应截面。
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引用次数: 0
Charge distribution and total kinetic energy in the fission of Rn, Ra and U Rn、Ra 和 U 裂变中的电荷分布和总动能
IF 2.6 3区 物理与天体物理 Q2 PHYSICS, NUCLEAR Pub Date : 2024-11-09 DOI: 10.1140/epja/s10050-024-01423-2
Andrei Butuza

For the even nuclei of (^{204-208})Rn, (^{214-218})Ra and (^{232-234})U, the simultaneous description of charge distribution and total kinetic energy are studied within the scission-point model. The calculated data are compared with experimental data from the literature. Correlations between these observables and other quantities of interest are analysed.

对于 Rn、Ra 和 U 的偶核,在裂变点模型中研究了电荷分布和总动能的同步描述。计算数据与文献中的实验数据进行了比较。分析了这些观测值与其他相关量之间的相关性。
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引用次数: 0
Study of the bubble motion inside a peristaltic tube 蠕动管内气泡运动研究
IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-09 DOI: 10.1007/s12043-024-02834-y
Abha Kumari, Rajat Tripathi, Amit Kumar

The motion of a long, axisymmetric bubble (fluid 1) inside a vertical peristaltic conduit containing a self-rewetting fluid (fluid 2) is discussed in this article. The fluid inside the tube and the floating bubble are immiscible, incompressible and have different densities. The peristaltic channel has two open ends. It is assumed that the bubble can move freely inside the tube without being restricted or deformed by the border wall. The effect of the density difference between the two fluids, Marangoni convection caused by the thermal and solutal gradient and an imposed back flow on the position and shape of the bubble have all been discussed. Motion of the bubble within a peristaltic tube, influenced by the Marangoni convection due to thermal and solutal gradients, has find various applications in the electrification of the atmosphere by sea bubbles, efficient mixing in microfluidic devices, improved cooling in heat exchangers, design of hydrophobic surfaces, spray coating thography techniques, enhanced mass transfer in chemical reactors, advancing various industrial and biomedical applications with precise fluid control. A mathematical model of the problem has been developed using a two-dimensional cylindrical polar coordinate system. The governing equations are in the form of linear partial differential equation and have been solved analytically. The effect of the thermo-solutal Marangoni convection in the microgravity region and the imposed back flow, impact of gravity-driven convection in the absence of the Marangoni convection or back flow, on the motion of bubble are discussed by plotting the position of the bubble. The initial radius and thermo-solutal Marangoni convection determine the bubble’s form as it evolves. When the initial radius falls below a critical value, the bubble becomes broader and shorter; conversely, when the original radius exceeds the crucial value, the bubble becomes longer and thinner.

本文讨论了一个轴对称长气泡(流体 1)在含有自润湿流体(流体 2)的垂直蠕动导管内的运动。导管内的流体和漂浮的气泡互不相溶、不可压缩且密度不同。蠕动通道有两个开口端。假设气泡可以在管内自由移动,不会受到管壁的限制或变形。我们讨论了两种流体之间的密度差、热梯度和溶质梯度引起的马兰戈尼对流以及施加的回流对气泡位置和形状的影响。气泡在蠕动管内的运动受热梯度和溶质梯度引起的马兰戈尼对流的影响,已在以下领域得到广泛应用:利用海泡对大气进行电气化、在微流体设备中进行高效混合、改善热交换器的冷却效果、设计疏水表面、喷涂照相技术、增强化学反应器中的传质、利用精确的流体控制推进各种工业和生物医学应用。利用二维圆柱极坐标系建立了该问题的数学模型。控制方程采用线性偏微分方程的形式,并已通过分析求解。通过绘制气泡位置图,讨论了微重力区域热固性马兰戈尼对流和外加回流的影响,以及在没有马兰戈尼对流或回流的情况下重力驱动对流对气泡运动的影响。初始半径和热溶解马兰戈尼对流决定了气泡在演变过程中的形态。当初始半径低于临界值时,气泡变宽变短;反之,当初始半径超过临界值时,气泡变长变细。
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引用次数: 0
Correction: Synthesis, structural, improved magnetic and electrical properties of Sr2+ doped BiFeO3 multiferroic materials 更正:掺杂 Sr2+ 的 BiFeO3 多铁性材料的合成、结构、磁性和电性改进
IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-08 DOI: 10.1007/s00339-024-08027-z
G. M. Sravani, N. Murali, B. Chandra Sekhar, P. S. V. Shanmukhi, Jasgurpreet Singh Chohan, Tulu Wegayehu Mammo, D. Parajuli, Khalid Mujasam Batoo, Muhammad Farzik Ijaz, K. Samatha
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引用次数: 0
Synthetic aperture imaging with pulsed terahertz waves and its application in three-dimensional modeling of complex structures 脉冲太赫兹波合成孔径成像及其在复杂结构三维建模中的应用
IF 2 3区 物理与天体物理 Q3 OPTICS Pub Date : 2024-11-08 DOI: 10.1007/s00340-024-08354-2
Yuanhao Du, Hui Feng, Shuai Wu

In this study, we report a three-dimensional synthetic aperture imaging system realized by a terahertz time-domain spectrometer. The temporal waveforms of the terahertz pulses scattered by the object to be imaged are Fourier transformed to the frequency domain before image reconstruction by the back-projection algorithm. The resolution of the imaging system is close to the center wavelength of the terahertz pulses, as tested by a resolution test chart. We also demonstrate the ability of this imaging method in non-destructive evaluation applications by measuring the internal structures of a university badge. A three-dimensional terahertz image and a series of slice views of the badge are acquired. The terahertz images clearly show the surface shape and internal structures of the badge, and the logo of the university on the badge is successfully extracted from the three-dimensional terahertz image.

在这项研究中,我们报告了一个由太赫兹时域光谱仪实现的三维合成孔径成像系统。被成像物体散射的太赫兹脉冲的时域波形被傅里叶变换到频域,然后通过反投影算法重建图像。经分辨率测试图测试,成像系统的分辨率接近太赫兹脉冲的中心波长。我们还通过测量大学徽章的内部结构,证明了这种成像方法在非破坏性评估应用中的能力。我们获得了徽章的三维太赫兹图像和一系列切片视图。太赫兹图像清晰地显示了徽章的表面形状和内部结构,并成功地从三维太赫兹图像中提取了徽章上的校徽。
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引用次数: 0
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