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< Page ,Total 41461 >
First- and second-order unconditionally stable direct discretization methods for multi-component Cahn–Hilliard system on surfaces EI
期刊论文 | 2022 , 401 | Journal of Computational and Applied Mathematics
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Abstract :

This paper proposes a first- and second-order unconditionally stable direct discretization method based on a surface mesh consisting of piecewise triangles and its dual-surface polygonal tessellation for solving the N-component Cahn–Hilliard system. We define the discretizations of the gradient, divergence, and Laplace–Beltrami operators on triangle surfaces. We prove that the proposed schemes, which combine a linearly stabilized splitting scheme, are unconditionally energy-stable. We also prove that our method satisfies the mass conservation. The proposed scheme is solved by the biconjugate gradient stabilized (BiCGSTAB) method, which can be straightforwardly applied to GPU-accelerated biconjugate gradient stabilized implementation by using the Matlab Parallel Computing Toolbox. Several numerical experiments are performed and confirm the accuracy, stability, and efficiency of our proposed algorithm. © 2021 Elsevier B.V.

Keyword :

Laplace transforms Discrete event simulation Volume measurement Mesh generation MATLAB

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GB/T 7714 Li, Yibao , Liu, Rui , Xia, Qing et al. First- and second-order unconditionally stable direct discretization methods for multi-component Cahn–Hilliard system on surfaces [J]. | Journal of Computational and Applied Mathematics , 2022 , 401 .
MLA Li, Yibao et al. "First- and second-order unconditionally stable direct discretization methods for multi-component Cahn–Hilliard system on surfaces" . | Journal of Computational and Applied Mathematics 401 (2022) .
APA Li, Yibao , Liu, Rui , Xia, Qing , He, Chenxi , Li, Zhong . First- and second-order unconditionally stable direct discretization methods for multi-component Cahn–Hilliard system on surfaces . | Journal of Computational and Applied Mathematics , 2022 , 401 .
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Model development and transient analysis of thermal stratification phenomenon in pool-type sodium-cooled fast reactors EI
期刊论文 | 2022 , 166 | Annals of Nuclear Energy
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Abstract :

Thermal stratification of pool-type SFR under transient accident conditions has a very significant impact on the performance of key components of the primary loop and the establishment of natural circulation of the residual heat removal system. In this paper, combined with the mechanism of thermal stratification, a three-dimensional (3-D) system analysis model is developed, which takes into account the energy source model, the 3-D convection model and the large space inlet-effect model. Based on the model development, the accuracy of 3-D thermal–hydraulic analysis model and the capability of thermal stratification analysis for SFR were fully verified. The validation results show that the method established in this paper takes into account accuracy and calculation efficiency. It can greatly reduce the amount of numerical grid, take up very little computing resources and greatly improves analyzing efficiency. And it can accurately simulate the thermal stratification phenomenon in the sodium pool. At the same time, the location with maximum temperature gradient of the inner barrel wall can be suggested in the process of thermal stratification. Furthermore, this study provides an important analytical method for the transient safety analysis of SFR, and has a great academic value and engineering significance. © 2021 Elsevier Ltd

Keyword :

Systems analysis 3D modeling Lakes Transient analysis Sodium-cooled fast reactors Thermal stratification

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GB/T 7714 Du, Peng , Shan, Jianqiang , Deng, Jian et al. Model development and transient analysis of thermal stratification phenomenon in pool-type sodium-cooled fast reactors [J]. | Annals of Nuclear Energy , 2022 , 166 .
MLA Du, Peng et al. "Model development and transient analysis of thermal stratification phenomenon in pool-type sodium-cooled fast reactors" . | Annals of Nuclear Energy 166 (2022) .
APA Du, Peng , Shan, Jianqiang , Deng, Jian , Xiong, Qingwen , Li, Zhongchun , Yuan, Peng . Model development and transient analysis of thermal stratification phenomenon in pool-type sodium-cooled fast reactors . | Annals of Nuclear Energy , 2022 , 166 .
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Nonlinear Restoring Force Identification of Strongly Nonlinear Structures by Displacement Measurement EI
期刊论文 | 2022 , 144 (3) | Journal of Vibration and Acoustics, Transactions of the ASME
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Abstract :

Strongly nonlinear structures have attracted a great deal of attention in energy harvesting and vibration isolation recently. However, it is challenging to accurately characterize the nonlinear restoring force using analytical modeling or cyclic loading tests in many realistic conditions due to the uncertainty of installation parameters or other constraints, including space size and dynamic disturbance. Therefore, a displacement-measurement restoring force surface identification approach is presented for obtaining the nonlinear restoring force. Widely known quasi-zero stiffness, bistable, and tristable structures are designed in a cantilever-beam system with coupled rotatable magnets to illustrate the strongly nonlinear properties in the application of energy harvesting and vibration isolation. Based on the derived physical model of the designed strongly nonlinear structures, the displacement-measurement restoring force surface identification with a least-squares parameter fitting is proposed to obtain the parameters of the nonlinear restoring force. The comparison between the acceleration integration and displacement differentiation methods for describing the restoring force surface of strongly nonlinear structures is discussed. Besides, the influence of the noise level on identification accuracy is investigated. In experimental conditions, quasi-zero stiffness, bistable, and tristable nonlinear structures with various geometrical parameters are utilized to analyze the identified nonlinear restoring force curve and measured force-displacement trajectory. Finally, experimental results verify the effectiveness of the displacement-measurement restoring force surface method to obtain the nonlinear restoring force. © 2021 by ASME.

Keyword :

Uncertainty analysis Energy harvesting Cyclic loads Parameter estimation Stiffness Displacement measurement Geometry

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GB/T 7714 Liu, Qinghua , Hou, Zehao , Zhang, Ying et al. Nonlinear Restoring Force Identification of Strongly Nonlinear Structures by Displacement Measurement [J]. | Journal of Vibration and Acoustics, Transactions of the ASME , 2022 , 144 (3) .
MLA Liu, Qinghua et al. "Nonlinear Restoring Force Identification of Strongly Nonlinear Structures by Displacement Measurement" . | Journal of Vibration and Acoustics, Transactions of the ASME 144 . 3 (2022) .
APA Liu, Qinghua , Hou, Zehao , Zhang, Ying , Jing, Xingjian , Kerschen, Gaëtan , Cao, Junyi . Nonlinear Restoring Force Identification of Strongly Nonlinear Structures by Displacement Measurement . | Journal of Vibration and Acoustics, Transactions of the ASME , 2022 , 144 (3) .
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Interplay of defect dipole and flexoelectricity in linear dielectrics EI
期刊论文 | 2022 , 210 | Scripta Materialia
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Flexoelectricity is apparently linearized with the dielectric permittivity and therefore regarded as an inherent dielectric response of solid dielectrics. Herein, we study the role of defect dipole to flexoelectricity by selecting several typical linear dielectrics, wherein the external factors including the surface piezoelectricity, ferroelectricity, and semiconducting interface are strictly eliminated. It is found that the defect dipoles could result in several times enhancement for both the flexoelectric coefficient and the flexocoupling coefficient of the linear dielectrics. The output of this work indicates that introducing defects was a general approach to improve the flexoelectric response. © 2021 Acta Materialia Inc.

Keyword :

Piezoelectricity Oxygen Dielectric materials Permittivity Crystallography

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GB/T 7714 Wang, Zhiguo , Li, Chunchun , Zhang, Zhen et al. Interplay of defect dipole and flexoelectricity in linear dielectrics [J]. | Scripta Materialia , 2022 , 210 .
MLA Wang, Zhiguo et al. "Interplay of defect dipole and flexoelectricity in linear dielectrics" . | Scripta Materialia 210 (2022) .
APA Wang, Zhiguo , Li, Chunchun , Zhang, Zhen , Hu, Yongming , Huang, Wenbin , Ke, Shanming et al. Interplay of defect dipole and flexoelectricity in linear dielectrics . | Scripta Materialia , 2022 , 210 .
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miR-146a调控脂肪间充质干细胞成骨分化的机制
期刊论文 | 2022 , 26 (01) , 70-75 | 中国组织工程研究
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背景:既往研究表明,miR-146a能影响骨髓间充质干细胞成骨分化,但其在脂肪间充质干细胞成骨分化中的调节功能尚未阐明。目的:探究miR-146a对小鼠脂肪间充质干细胞成骨分化的调控作用。方法:获取雄性C57BL/6小鼠脂肪间充质干细胞,采用倒置显微镜观察细胞形态,流式细胞学方法检测第3代细胞CD29、CD44、CD45的表达,然后用mi R-NC、mi R-146a mimics和mi R-146a inhibitor转染脂肪间充质干细胞并进行成骨诱导分化,成骨诱导第6天,采用碱性磷酸酶染色观察钙化程度,RT-PCR和Western blot检测成骨表型标志物的表达;成骨诱导第12天,采用茜...

Keyword :

脂肪间充质干细胞 成骨细胞 miR-146a 信号通路 干细胞 成骨分化

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GB/T 7714 黄涛 , 程志坚 , 贾志强 et al. miR-146a调控脂肪间充质干细胞成骨分化的机制 [J]. | 中国组织工程研究 , 2022 , 26 (01) : 70-75 .
MLA 黄涛 et al. "miR-146a调控脂肪间充质干细胞成骨分化的机制" . | 中国组织工程研究 26 . 01 (2022) : 70-75 .
APA 黄涛 , 程志坚 , 贾志强 , 赵晓光 , 王磊 , 翟文静 et al. miR-146a调控脂肪间充质干细胞成骨分化的机制 . | 中国组织工程研究 , 2022 , 26 (01) , 70-75 .
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黏性涡环的失稳与多级分叉行为
期刊论文 | 2022 , (04) , 1-9 | 西安交通大学学报
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为了探究液滴撞击液池形成涡环的长期演化行为,本文以不同浓度的甘油水溶液为对象,研究其在滴入水池后的形态变化,通过高速摄像机对整个过程进行捕捉,发现其由初始液滴形态转变为涡环再到涡环失稳的一系列演化行为,之后分析其失稳与分叉的变化规律与主要影响因素。最后建立了涡环下沉速度的物理模型并进行了数学推导,建立了涡环前锋与尾部的运动无量纲表达式。研究表明,液滴入池后形成的涡环均不会一直稳定生长,而是在某一时刻发生失稳,失稳时刻与液滴本身属性有关。涡环解体为数个下沉的“手指”,在其下沉一定距离后,“手指”前锋沿其运动方向的垂向发生分叉,分叉后继续下沉,并重复出现自相似的分叉行为,且新产生的分叉前锋开始会获...

Keyword :

衰减 失稳 分叉 黏性涡环

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GB/T 7714 张亚杰 , 杜睿恒 , 魏衍举 et al. 黏性涡环的失稳与多级分叉行为 [J]. | 西安交通大学学报 , 2022 , (04) : 1-9 .
MLA 张亚杰 et al. "黏性涡环的失稳与多级分叉行为" . | 西安交通大学学报 04 (2022) : 1-9 .
APA 张亚杰 , 杜睿恒 , 魏衍举 , 杨亚晶 . 黏性涡环的失稳与多级分叉行为 . | 西安交通大学学报 , 2022 , (04) , 1-9 .
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驱动人体下肢运动的脑肌电相干同步方法
期刊论文 | 2022 , (02) , 1-10 | 西安交通大学学报
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针对驱动下肢运动中脑肌电信息不同步现象导致的脑肌电融合识别稳定性差等问题,提出一种结合多元自回归(mvAR)模型及最大化相干性法则的驱动下肢运动脑肌电相干性分析及信息同步化方法。首先根据驱动下肢运动中神经冲动传导机制及运动控制原理,进行驱动下肢运动脑肌电产生原理及信息不同步现象分析;其次,引入多元自回归模型,以下肢稳态力输出状态下的多次实验多通道脑肌电作为模型输入,迭代得到基于高维模型拟合的脑肌电时频相干性结果;再次,确定显著相干频率及时刻,并利用最大化相干性法则将脑肌电时延量化,实现脑肌电同步;最后,搭建下肢稳态力输出脑肌电同步采集实验平台并进行方法验证。实验结果表明,在下肢稳态力输出过程中...

Keyword :

脑肌电同步 时延量化 相干性分析 多元自回归模型 脑肌电融合

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GB/T 7714 孙沁漪 , 张小栋 , 李存昕 et al. 驱动人体下肢运动的脑肌电相干同步方法 [J]. | 西安交通大学学报 , 2022 , (02) : 1-10 .
MLA 孙沁漪 et al. "驱动人体下肢运动的脑肌电相干同步方法" . | 西安交通大学学报 02 (2022) : 1-10 .
APA 孙沁漪 , 张小栋 , 李存昕 , 李瀚哲 . 驱动人体下肢运动的脑肌电相干同步方法 . | 西安交通大学学报 , 2022 , (02) , 1-10 .
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Thermal and hydraulic performance of a compact precooler with mini-tube bundles for aero-engine EI
期刊论文 | 2022 , 200 | Applied Thermal Engineering
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It is significant to evaluate whether the classical correlations based on conventional tube size (≥10 mm) is suitable for predicting the flow and heat transfers characteristics of the precooler composed of mini-tube bundles (around 1 mm). In this work, a full-scale heat transfer experiment of precooler is carried out, and the high-temperature incoming air (686 K) in the experiment was produced by burning the mixture of air and alcohol. The numerical simulation of a unit precooler is also conducted with Computational Fluid Dynamics. The classical correlations for the design of heat exchanger are evaluated by both experiments and simulations. The results indicate that the prediction error of classical correlations of flow resistance is less than 10% for both the flow inside the mini-tube and across mini-tube bundles. The classical correlation of heat transfer inside tube can meet the engineering requirements. However, the maximum deviation of Nusselt number prediction for the outside flow across tube bundles reaches 32.1%. A new correlation for calculating heat transfer across a compact precooler composed of staggered mini-tube bundles with a prediction error below 5% is finally established based on the experimental and numerical results. © 2021 Elsevier Ltd

Keyword :

Tubes (components) Heat resistance Computational fluid dynamics Aircraft engines Heat transfer Heat exchangers Engines Forecasting

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GB/T 7714 Li, Nan , Zhao, Yun , Wang, Hao et al. Thermal and hydraulic performance of a compact precooler with mini-tube bundles for aero-engine [J]. | Applied Thermal Engineering , 2022 , 200 .
MLA Li, Nan et al. "Thermal and hydraulic performance of a compact precooler with mini-tube bundles for aero-engine" . | Applied Thermal Engineering 200 (2022) .
APA Li, Nan , Zhao, Yun , Wang, Hao , Chen, Qiao , Li, Zhe , Ma, Yuan et al. Thermal and hydraulic performance of a compact precooler with mini-tube bundles for aero-engine . | Applied Thermal Engineering , 2022 , 200 .
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Two new luminescent coordination polymers: Therapeutic effects on angina pectoris EI
期刊论文 | 2022 , 15 (2) | Arabian Journal of Chemistry
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Via tuning the central metal ions from Zn(II) to Cd(II), two new coordination polymers was acquired in success, namely {(H3O)[Zn4(bptc)3(3-bpmh)]}n·6n(H2O) (1) and [Cd3(bptc)(3-bpmh)(H2O)3]n·4n(H2O) (2) (H3bptc = biphenyl-3,4′,5-tricarboxylic acid, 3-bpmh = N,N-bis-pyridin-3-ylmethylene-hydrazine), under hydrothermal conditions. The luminescent properties investigations showed that 1–2 emit intense luminescence with different maximum emission peaks. Their therapeutic and nursing protective effects on angina pectoris were assessed and we also discussed the corresponding mechanism simultaneously. The content of Interleukin-6 (IL-6) and soluble vascular cell adhesive molecule (SVCAM-1) released by endothelial cells (EC) was discovered through enzyme linked immunosorbent assay (ELISA) detection kit. Besides, the activation of Notch signaling pathway was also evaluated by the real time reverse transcription-polymerase chain reaction (RT-PCR). Influence of compounds on the peripheral blood white blood cell (WBC) numbers was measured with flow cytometry. We utilized optical coherence tomography (OCT) to measure the thickness of the fibrous cap of atherosclerotic plaque in patients with angina pectoris. © 2021 The Authors

Keyword :

Cadmium compounds Luminescence Metal ions Nitrogen compounds Optical tomography Cytology Blood Metals Polymerase chain reaction Adhesives Zinc compounds Endothelial cells

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GB/T 7714 Li, Jing , Yuan, Jing-Wei , Yu, Hai-Bo et al. Two new luminescent coordination polymers: Therapeutic effects on angina pectoris [J]. | Arabian Journal of Chemistry , 2022 , 15 (2) .
MLA Li, Jing et al. "Two new luminescent coordination polymers: Therapeutic effects on angina pectoris" . | Arabian Journal of Chemistry 15 . 2 (2022) .
APA Li, Jing , Yuan, Jing-Wei , Yu, Hai-Bo , Kang, Yu-Ming , Su, Qing-Feng . Two new luminescent coordination polymers: Therapeutic effects on angina pectoris . | Arabian Journal of Chemistry , 2022 , 15 (2) .
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Excellently abradable seal coating with spherical closed-pore for next-generation aero-engine application EI
期刊论文 | 2022 , 307 | Materials Letters
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To improve the aero-engine compressor efficiency and reliability, abradable seal coatings need to have good abradability resulting from reduced hardness. However, low hardness is often coupled with low bonding strength, resulting in coating spalling off failure during service. To defeat the conflicts between low hardness and high bonding strength, a new abradable seal coating with a spherical closed-pore structure was prepared in this study. Compared to conventional coatings, the new coating has both lower hardness and higher bonding strength. In the high-speed scraping test, the coating presented excellent abradability without any coating spalling. The new abradable seal coating is promising to improve the efficiency and reliability of the next-generation aero-engine. © 2021

Keyword :

Coatings Diffusion bonding Pore structure Spalling Engines Aircraft engines Hardness Efficiency

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GB/T 7714 Tong, Yun-Qi , Chen, Lin , Yang, Guan-Jun . Excellently abradable seal coating with spherical closed-pore for next-generation aero-engine application [J]. | Materials Letters , 2022 , 307 .
MLA Tong, Yun-Qi et al. "Excellently abradable seal coating with spherical closed-pore for next-generation aero-engine application" . | Materials Letters 307 (2022) .
APA Tong, Yun-Qi , Chen, Lin , Yang, Guan-Jun . Excellently abradable seal coating with spherical closed-pore for next-generation aero-engine application . | Materials Letters , 2022 , 307 .
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