Results 131 to 140 of about 622,498 (214)

拓展一级磁相变材料作为磁致冷材料应用时的制冷温区的方法

open access: yes, 2017
本发明提供了一种当一级磁相变材料作为磁致冷材料应用时拓展该材料制冷温区的方法,将该一级磁相变材料经零磁场冷却后进行升温,在升温过程中仅在相变温区磁性和电阻发生相变,具有磁熵变△S,而在其它温区磁性和电阻不发生变化,无磁熵变;同时,将该材料经非零磁场冷却后进行升温,由于捕获相的出现在升温过程中还在其它温区发生磁性和电阻的变化,具有磁熵变化△S’;因此,当该材料作为磁制冷材料应用时,通过对该材料施加磁场,在该磁场条件下降温冷却,使其铁磁性、低电阻的奥氏体相捕获到低温,即可实现低温区的巨磁热效应 ...
王保敏, 李润伟, 孙丹丹, 沈渊
core  

Poverty, Inequality, and Social Security During the COVID‐19 Pandemic: Evidence From Linked Swiss Tax Data

open access: yesPoverty &Public Policy, Volume 18, Issue 3, September 2026.
ABSTRACT This paper examines the impact of the COVID‐19 pandemic on income and wealth inequality in Switzerland, with a particular focus on poverty dynamics and the role of the social security system. Using newly linked administrative tax data for four large cantons covering over a third of the Swiss population, we track changes in household income and
Oliver Hümbelin   +2 more
wiley   +1 more source

Ni‐Induced Interface Refinement Enhances Strength‐Ductility Synergy in LPBF‐Processed Ti‐Mo‐Ni Alloy

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Microstructural refinement is a common strategy for strengthening additively manufactured titanium alloys because it promotes phase nucleation. Reducing the α/β interfacial formation energy is an effective way to increase the nucleation rate.
An Li   +6 more
wiley   +1 more source

In Situ Rare Earth Nanoparticle Reinforcement of NiCoCrAlYTa Coatings via HCPEB Modification: Insights Into Early Oxidation Behavior and Microstructural Evolution

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT NiCoCrAlYTa coatings are widely used as bond coats in thermal barrier coating (TBC) systems for gas turbines and aeroengines to provide oxidation resistance and support the formation of a protective thermally grown oxide (TGO). Herein, high‐current pulsed electron beam (HCPEB) modification was utilized to strengthen a NiCoCrAlYTa coating by ...
Xiangcheng Li   +6 more
wiley   +1 more source

可变形管流动相似性

open access: yes, 1983
生理流动的相似准则因目标而异。本文解决两个问题:(ⅰ)以动脉内血液流动和管壁运动的偶合作用为目标,建立了有限长度可膨胀管内非牛顿流体非定常运动的相似准则;(ⅱ)以阻力-流量特性和流态改变为目标,分析了可坍管定常流动的相似性 ...
陶祖莱, 席葆树, 丁启明
core   +1 more source

Synergistic Chemodynamic–Photothermal Antibacterial Activity of a Nanozyme Derived From Processed Pyritum

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Pyritum can eliminate blood stasis and promote the healing of muscles and bones, which has been used as a traditional mineral medicine in China for thousands of years. However, the mechanisms of action and processing methods of Pyritum were not illustrated.
Mingxia Li   +8 more
wiley   +1 more source

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