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应用卷积近场动力学快速模拟随机裂纹扩展

岩土力学 2025年第2期46卷 625-639页

作者：周建廖星川刘福深尚肖楠沈君逸浙江大学滨海和城市岩土工程研究中心浙江杭州310058 浙江大学浙江省城市地下空间开发工程技术研究中心浙江杭州310058 浙江大学岩土工程计算中心浙江杭州310058

传统近场动力学方法采用积分方程替代连续介质力学中的偏微分方程,获得了对未知函数无光滑限制且更具一般性的方程,使得该方法特别适合模拟裂纹自发萌生和扩展等非连续问题,但高昂的计算成本往往限制了其在实际工程中的应用。采用一种... 详细信息

传统近场动力学方法采用积分方程替代连续介质力学中的偏微分方程,获得了对未知函数无光滑限制且更具一般性的方程,使得该方法特别适合模拟裂纹自发萌生和扩展等非连续问题,但高昂的计算成本往往限制了其在实际工程中的应用。采用一种基于快速卷积的近场动力学方法,以提高近场动力学方法的计算效率。该算法采用快速傅里叶变换来完成卷积计算,实现近场动力学方程中积分项的计算,可显著降低近场动力学的计算成本。基于快速卷积近场动力学的计算流程及其数值实现特性,提出了一套适用于该算法的前处理方法,并通过两个含预制裂纹的受拉方板算例验证了该前处理方法的可行性。在此基础上,进一步提出了随机裂纹扩展预测的建模方法,为岩土体随机裂纹扩展的预测研究提供了一个新的可行的思路。

关键词：近场动力学快速卷积建模方法随机裂纹扩展预测

An Extension of Weyl Schouten Theorem for Lipschitz and H2 Manifolds

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Acta Mathematica Sinica,English Series 2017年第7期33卷 926-932页

作者： xiao shang JIN Department of Mathematics Nanjing UniversityNanjing 210093P.R.China Beijing International Center for Mathematical Research Peking UniversityBeijing 100871P.R.China

In this article, we extend the Weyl Schouten Theorem for a C0＇1 A W2＇2 manifold only under the assumptions on scalar curvature. Also we obtain a regularity of a C0＇1 V/W2＇2 manifold by conformal transformation und... 详细信息

关键词： Weyl Schouten theorem Lipschitz harmonic coordinates conformal

习近平文化思想融入高校思想政治理论课的价值意蕴与实现路径

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教育探索 2025年第02期 1-5页

作者：商晓辉田晓妍西北农林科技大学马克思主义学院

习近平文化思想致力于传承与发扬中华优秀传统文化，在新时代赋予文化发展新的内涵。将习近平文化思想融入高校思想政治理论课，要系统分析习近平文化思想对新时代高校思想政治理论课的时代价值，找出其与高校思想政治理论课在教育内容... 详细信息

习近平文化思想致力于传承与发扬中华优秀传统文化，在新时代赋予文化发展新的内涵。将习近平文化思想融入高校思想政治理论课，要系统分析习近平文化思想对新时代高校思想政治理论课的时代价值，找出其与高校思想政治理论课在教育内容、教育方法等方面的契合点，丰富和发展相关理论与模式的现实内涵和意义。探究习近平文化思想在高校思想政治理论课中的运用，可以为高校思想政治教育开拓新思路，为推动和健全大学生思想政治教育理论体系建设寻求新的突破点和落脚点。

关键词：习近平文化思想高校思想政治理论课价值意蕴有效路径

In situ TiN-reinforced CoCr2FeNiTi(0.5) high-entropy alloy composite coating fabricated by laser cladding

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Rare Metals 2020年第10期39卷 1190-1195页

作者： Ya-Xiong Guo Qi-Bin Liu xiao-Juan shang College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Guizhou Province Key Laboratory of Materials Structure and Strength Guiyang 550025China

The fcc structural CoCr2 FeNiTi(0.5) high-entropy alloy(HEA) composite coating with TiN particles reinforced was acquired by laser cladding on the commercial904 L stainless *** results show that phase structure is mainly composed of fcc solid solution and TiN *** coating exhibits excellent structural stability below850℃.The microstructure consists of irregular dendrite and TiN *** electron microscopy(TEM) results reveal that the close-packed plane of fcc phase is(111) with interplanar spacing of ~ 0.208 *** interface between TiN and fcc matrix is *** the angle of boundary between dendrite and matrix is ~ 65°.The hardness and corrosion resistance of coating have much improvement compared with those of substrate.

关键词： TiN particle reinforced High-entropy alloy Semi-coherent interface Laser cladding

A transient single particle model under FCI conditions

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Nuclear Science and Techniques 2005年第5期16卷 315-320页

作者： LI xiao-Yan shang Zhi XU Ji-Jun Department of Nuclear Science and System Engineering School of Mechanics and Power Shanghai Jiaotong University Shanghai 200030

The paper is focused on the coupling effect between film boiling heat transfer and evaporation drag around a hot-particle in cold liquid. Based on the continuity, momentum and energy equations of the vapor film, a transient two-dimensional single particle model has been established. This paper contains a detailed description of HPMC (High-temperature Particle Moving in Coolant) model for studying some aspects of the premixing stage of fuel-coolant interactions (FCIs). The transient process of high-temperature particles moving in coolant can be simu-lated. Comparisons between the experiment results and the calculations using HPMC model demonstrate that HPMC model achieves a good agreement in predicting the time-varying characteristic of high-temperature spheres moving in coolant.

关键词： FCI 热物理学瞬时模型热力工程

A new route of fabricating porous polyimide membranes

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International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 782-785页

作者： Jiu-mei xiao Xin-chun shang Li-ping Qin School of Applied Science University of Science and Technology Beijing Beijing 100083 China

A novel experimental route to fabricate porous polyimide membranes （PPMs） with ideal air permeability was reported. The polymer solution layer consisting of the corresponding polyamic acid （PAA）, solvent, and dibutyl phthalate （DBP） with a boiling temperature of 340℃ was treated by a simple process. The polymer solution layer was first treated at a lower temperature （about 150℃）, then the received solid membrane was further imidized at a higher temperature （about 270℃）, and finally, DBP was removed from the membrane at a temperature above its boiling temperature. The final asymmetric polyimide membrane with a dense skin layer was obtained. To improve the air permeability of the polyimide membranes, the polymer solution layer was treated between two substrates. And the PPMs with open pores on both sides are fabricated and the air permeability of the films is improved greatly.

关键词： polyimide polyamic acid membrane additive porous materials

In-situ electrochemical activation designed hybrid electrocatalysts for water electrolysis

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Science Bulletin 2018年第13期63卷 853-876页

作者： xiao shang Bin Dong Yong-Ming Chai Chen-Guang Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China) College of Science China University of Petroleum (East China)

Developing transition metal-based electrocatalysts with rich active sites for water electrolysis plays important roles in renewable energy fields. So far, some strategies including designing nanostructures, incorporating conductive support or foreign elements have been adopted to develop efficient electrocat- alysts. Herein, we summarize recent progresses and propose in-situ electrochemical activation as a new pretreating technique for enhanced catalytic performances. The activation techniques mainly comprise facile electrochemical processes such as anodic oxidation, cathodic reduction, etching, lithium-assisted tuning and counter electrode electro-dissolution. During these electrochemicaI treatments, the catalyst surfaces are modified from bulk phase, which can tune local electronic structures, create more active spe- cies. enlarge surface area and thus improve the catalytic performances. Meanwhile, this technique can couple the atomic, electronic structures with electrocatalysis mechanisms for water splitting. Compared to traditional chemical treatment, the in-situ electrochemical activation techniques have superior advantages such as facile operation, mild environment, variable control, high efficiency and flex- ibility. This review may provide guidance for improving water electrolysis efficiencies and hold promis- ing for application in many other energy-conversion fields such as supercapacitors, fuel cells and batteries.

关键词： In-situ electrochemical activation Transition metal Hybrid electrocatalyst Water electrolysis

Intrinsically asymmetric atomic character regulates piezoelectricity in two-dimensional materials

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Frontiers of physics 2024年第3期19卷 153-162页

作者： Yun-Qin Li Qi-Wen He Dai-Song Tang xiao shang xiao-Chun Wang School of Physics Science and Information Technology Liaocheng UniversityLiaocheng 252000China Key Laboratory of Polar Materials and Devices Ministry of EducationDepartment of ElectronicsEast China Normal UniversityShanghai 200241China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

Decreasing of layer thickness causes the decrease of polarization until it disappears due to the existence of depolarization ***,the search for strong piezoelectric materials is highly desirable for multifunctional ultra-thin piezoelectric ***,we propose a common strategy for achieving strong piezoelectric materials through the electronic asymmetry induced by the intrinsically asymmetric atomic character of different chalcogen ***,in the tetrahedral lattice structures,for example,M4X3Y3(M=Pd/Ni,X/Y=S,Se or Te,X≠Y)monolayers are proved to display excellent out-of-plane ***4Se3Te3 possesses the largest piezoelectric coefficient d33 of 61.57 pm/V,which is much larger than that of most 2D *** the electronic asymmetry further increases the out-of-plane piezoelectricity of Janus M4X3Y3 ***,the out-of-plane piezoelectricity is positively correlated with the ratio of electronegativity difference(Red)and the electric dipole moment(P).This work provides alternative materials for energy harvesting nano-devices or self-energized wearable devices,and supplies a valuable guideline for predicting 2D materials with strong out-of-plane piezoelectricity.

关键词： piezoelectricity intrinsically asymmetric atomic character ratio of electronegativity difference electric dipole moment first-principles calculations

手术室路径化护理联合多模式疼痛护理对子宫肌瘤手术效果及疼痛程度的影响

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罕少疾病杂志 2025年第1期32卷 179-181页

作者：尚小巧张玲玲陈晶南阳市第二人民医院妇科河南南阳473000

目的探究手术室路径化护理联合多模式疼痛护理对子宫肌瘤手术效果及疼痛程度的影响。方法选取2019年7月至2024年7月期间于本院接受手术治疗的子宫肌瘤患者110例,按护理方案分为两组,对照组(n=60)患者接受常规护理,观察组(n=50)患者接... 详细信息

目的探究手术室路径化护理联合多模式疼痛护理对子宫肌瘤手术效果及疼痛程度的影响。方法选取2019年7月至2024年7月期间于本院接受手术治疗的子宫肌瘤患者110例,按护理方案分为两组,对照组(n=60)患者接受常规护理,观察组(n=50)患者接受手术室路径化护理联合多模式疼痛护理。比较两组患者的围术期手术指标、疼痛程度、负性情绪、舒适度以及并发症发生情况。结果干预前,两组SAS、SDS及GCQ评分差异均不显著(P>0.05)。干预后,观察组排气时间、排便时间、下床时间、住院时间、术后各时间点的VAS评分、SAS评分、SDS评分、并发症总发生率均显著低于对照组(P<0.05);GCQ评分显著高于对照组(P<0.05)。结论在接受手术治疗的子宫肌瘤患者中,实施手术室路径化护理联合多模式疼痛护理,可有效改善患者的疼痛程度及负性情绪,显著提高患者的舒适度,明显减少并发症的发生,利于患者术后恢复。

关键词：手术室路.径化护理多模式疼痛护理子宫肌瘤手术效果疼痛程度

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