Results 11 to 20 of about 407,494 (154)

连续铸钢与电磁搅拌

open access: yes, 2015
编者按:2014年10月29日力学所举办中科院老科协力学分会“科普回所日”活动,力学所毛斌研究员在会上作了题为“连续铸钢与电磁搅拌”的报告,本刊在此发布,以飨读者。 毛斌研究员   报告提要:连续铸钢(简称“连铸”)是将钢水连续铸造成各种形状铸坯的一项枝术,是对传统模铸技术的一个革命,目前已在世界范围内占据统治地位。连铸的优点极其突出,而其缺点也令人头痛。工业实践表明,解决其缺陷的最有效手段乃是各种类型的电磁搅拌技术 ...
毛斌
core   +2 more sources

基于连续非连续质点法的冰的脆性破坏模拟

open access: yes, 2014
本文在基于连续介质力学的离散元方法基础上,引入可分裂物质点和子域的 概念,结合有限元法、离散元法和无网格法的优势发展了连续非连续质点法,并 在拉格朗日系统下给出了严格的数学表述。该算法不仅可以描述材料的静态变形, 更能准确计算材料内部的波传播特性、裂缝的产生和发展过程、破裂面的接触摩 擦以及块体的碰撞运动,实现了连续-非连续统一表述。 提出了一类可描述脆性材料渐进破坏行为的损伤本构模型——应变强度分 布本构模型,并给出了几种不同表述形式。该模型引入应变强度分布的概念,刻 画材料的非均匀性 ...
周东
core   +2 more sources

Designing “Sphere/Network” Hierarchical Dielectric Loss Structure for Efficient Electromagnetic Wave Absorption

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Electromagnetic wave absorption materials require high dielectric loss and excellent impedance matching performance. However, current conventional biomass‐derived electromagnetic wave absorption materials are still limited by low electrical conductivity and a single structure.
Yue Zhang   +9 more
wiley   +1 more source

连续介质力学与断裂

open access: yes, 2004
在这篇文章里,我们结合断裂问题回顾连续介质力学的发展,并指出,为了更深地理解和描述断裂现象 ...
郑哲敏
core   +2 more sources

基于磁记忆检测和SVM的连续管疲劳失效判别

open access: yesShiyou jixie, 2014
针对现有连续管疲劳损伤检测评价方法存在的不足,提出了基于金属磁记忆方法的连续管疲劳损伤评价方法,建立了连续管疲劳损伤状况判别支持向量机(SVM)模型。选取CT80材质的连续管进行弯曲疲劳损伤磁记忆检测试验研究,利用判别模型对试验数据进行分析,结果表明,SVM模型能够较好地建立起连续管疲劳损伤状态与磁记忆信号之间的映射关系,并能清晰地反映连续管的疲劳损伤过程,为检测连续管疲劳失效提供了一种新的判别方法。
范磊, 樊建春, 李晓秋, 雷军
doaj  

Study on Multi‐Step Deformation Mechanisms and Synergistic Regulation of Strength and Ductility in Ti‐2Al‐2.5Zr Alloy Tubes for Nuclear Power Applications

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT To overcome the strength–ductility trade‐off in fabricated Ti‐2Al‐2.5Zr alloy tubes, we systematically investigated the microstructural evolution and mechanical behavior throughout thermomechanical processing, including hot working (forging and extrusion) and cold multi‐pass rolling.
Yanlong Xia   +7 more
wiley   +1 more source

连续管直推工艺在带压水平井测试中的应用

open access: yesShiyou jixie, 2014
因水平井井身结构特殊,在测试过程中需借助工具才能将仪器输送到井底,对于带压水平井输送工艺将更加复杂。为此,研究设计了连续管直推工艺技术。该技术将连续管作为测试仪的输送工具,测试仪连接在连续管底部,测试电缆置于连续管外部,通过同步上提下放连续管和测试电缆实施不同井况水平井的动态测试;能带压施工,设计的三通密封短节能对测试电缆进行密封和承压。江苏油田采用连续管直推工艺对M8P1井实施电磁探伤测试,测试过程中未见遇阻、遇卡现象;起出测试管柱后未发现连续管和测试电缆有明显的缠绕,电缆也未见破损 ...
徐贵春, 徐宜建
doaj  

Architecting a Robust Yarn‐Like CNT Framework for Structurally Resilient ZnSe Anodes in Potassium–Ion Batteries

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT The development of structurally stable anodes with high capacities and long cycle lives is essential for the development of potassium–ion batteries. Conversion‐type anodes have attracted considerable attention in potassium–ion batteries (PIBs) due to their high theoretical capacities.
Jeong Ho Na   +7 more
wiley   +1 more source

连续管注入过程弯曲回弹分析

open access: yesShiyou jixie, 2012
连续管抽出卷筒以及进入注入装置的生产过程中,经历了一系列的弯曲与回弹。采用应力学方法对连续管弯曲回弹进行了相关分析,根据材料特性,重点对连续管弯曲后成塑性进行了研究。推导出了计算连续管弯曲回弹处于弹性变形阶段的最小弯曲半径的计算公式。公式表明,连续管弯曲回弹最小弯曲半径与壁厚成反比,与外径成正比。最后指出,得到的计算模型可以为连续管现场应用提供一定的理论依据。
马卫国   +4 more
doaj  

Political Cycles, Electricity Policy, and Mexico's Economy

open access: yesLatin American Policy, Volume 17, Issue 2, June 2026.
ABSTRACT Electricity reform in Mexico should stimulate economic growth, improve energy efficiency, and reduce greenhouse gas emissions. This article evaluates the successes and failures of reform and draws lessons across political cycles by analyzing changes in political dynamics—often tied to policy reversals—and the legal framework during the pro ...
David Bonilla
wiley   +1 more source

Home - About - Disclaimer - Privacy