Results 41 to 50 of about 1,273,861 (154)

Microstructure Tailoring of Laser Powder Bed Fused Nb521 Alloy Toward Strength‐Ductility Synergy

open access: yesRare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Niobium‐based refractory alloys are promising candidates for high‐temperature aerospace structures, yet their limited ambient‐temperature ductility and poor processability remain major barriers to broader implementation. Here, Nb521 alloy was fabricated by laser powder bed fusion (LPBF), and the effects of processing conditions and subsequent ...
Lele Qin   +7 more
wiley   +1 more source

延安新女性

open access: yes, 2011
[[abstract]]五四新女性往哪裡去了?文革鐵姑娘從哪裡來?本篇論文在此提問基礎上,以中共延安時期為研究範圍,探討中共官方嘗試重新打造時代女性形象的過程。 延安時期乃中國對日抗戰期間,中共以陝甘寧邊區為主要根據地,克服當地艱困的自然條件,以及遭國民黨、日軍包圍的外在局勢,創造出「延安道路」邁向建國,在這條「道路」上,中共對女性的期許為何?中共需要什麼樣的女性?在將婦女納入建國工程的同時,中共也一步步塑造出婦女應該扮演的角色、必需具備的特質,在此過程中,中共透過什麼手段打造出符合其理想的女性?
Shu-Chi Lin, 林書琦
core  

事件定时系统的自动延时补偿算法研究

open access: yesHe jishu
针对大型加速器定时系统中各节点因光纤长度差异引起的延时问题,提出了一种基于事件定时系统的深度优先多节点自动延时补偿算法,旨在解决因光纤长度差异导致的时间同步问题与长距离光纤传输带来的稳定性问题,并通过测量不同设备的触发信号到达时间,根据算法进行延时调整,采用125 MHz事件时钟,实现8 ns时间精度的延时补偿。在涉及6 m和30 m光纤长度的测试中,延时补偿成功实现了信号输出对齐,对齐精度约为5.5 ns,证明了该算法在保持不同光纤长度同步方面的有效性,该算法提高了事件定时系统的时间同步精度和稳定性 ...
彭 仲达   +3 more
doaj   +1 more source

Dual‐Bioactive Lignin‐Based Microcarrier Hydrogel Platform via Metal Salt Crosslinking for Synchronized Infection Eradication and Bone Regeneration

open access: yesRare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Infected bone defects represent a dual therapeutic challenge demanding concurrent infection inhibition and osteogenesis promotion. Systemic antibiotic administration is taken as a classical treatment protocol but often yields inadequate local antibiotic concentrations and delayed bone repair.
Xucai Wang   +8 more
wiley   +1 more source

高线性度外延及注入GaAs Hall器件

open access: yes, 2002
讨论了外延及注入制作的薄层GaAs Hall器件如何获得高的磁线性度。GaAs Hall器件的磁线性度在高磁场下会有偏离,但可以通过外延及注入的过渡层对有源区进行补偿,在合适的有源区和过渡区的浓度和厚度分布中,可以得到在2.5T的强磁场下,±0.04 ...
郑一阳
core  

An experimental approach to assess the combined effects of multiple stressors on a large vertebrate species

open access: yesConservation Biology, Volume 40, Issue 4, August 2026.
Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta   +24 more
wiley   +1 more source

高应变率下延性多孔介质中孔洞的动态演化

open access: yes, 1994
本文提出了一个新的材料延性动态损伤模型;模型中不但包括了率效应;同时还考虑了惯性效应、孔洞表面能变化和材料硬化对孔洞演化的影响.此外;在模型中同时考虑了体应力和偏应力对孔洞演化的作用.从孔洞演化方程直接得到了孔洞增长和压缩应力临界表达式;Carroll和Holt的结果作为该表达式的一个特例而得出.模型的数值分析得出以下结论:①延性孔洞的动态增长对率效应十分敏感;应变率越高;孔洞增长越快;②惯性效应在高加载率条件下对孔洞增长有明显的影响;具体表现为对孔洞增长的阻碍作用.除此之外 ...
郑坚, 王泽平
core   +2 more sources

拖延、依賴、社會閒散及任務可視性之關聯:以幼保系學生為例 Procrastination, Dependence, Social Loafing and Task Visibility: A Case Study of Early Childhood Care Students

open access: yesJournal of Curriculum Studies
本研究目的在於考驗主動/被動拖延者在依賴型人格及社會閒散現象之差異,以及控制在團體課業分派下,兩者是否因高/低任務可視性而增加社會閒散現象。研究結果為:一、主動拖延者及被動拖延者之兩組模型關係相似;二、主動拖延者比被動拖延者具有較高之壓力偏好、期限因應能力及意圖拖延,較低的依賴型人格,但與被動拖延者具有相似程度之任務反感及失敗恐懼;三、對被動拖延者而言,低任務可視性組會比高任務可視性組產生較高之社會閒散現象。對主動拖延者而言,高任務可視性組則會比低任務可視性組產生較高之社會閒散現象。 The main
邱紹一 Shao-I Chiu   +1 more
doaj   +1 more source

Overlap of nonbreeding wandering albatrosses with fisheries and implications for colony‐specific population trajectories at South Georgia

open access: yesConservation Biology, Volume 40, Issue 4, August 2026.
Abstract Bycatch in fisheries is one of the most serious threats to pelagic seabirds, causing major population declines. Mitigation measures can reduce bycatch substantially, but many fisheries fail to apply best practices, and seabird mortality remains high.
V. Warwick‐Evans   +2 more
wiley   +1 more source

离子束外延生长半导体性锰硅化合物

open access: yes, 2001
利用质量分析的低能双离子束外延技术得到了半导体性的锰硅化物,Mn_(27)Si_(47)和Mn_(15)Si_(26)。俄歇电子谱谐深度组分测量结果表明,在单晶Si的表面淀积了一薄层厚度约为37.5nm的Mn,另一部分Mn离子成功注入进Si基底里,注入深度为618nm。在840℃条件下在流动N_2气氛中对生长样品进行退火,X射线衍射结果表明退火后Mn_(27)Si_(47)和Mn_(15)Si_(26 ...
刘志凯   +6 more
core  

Home - About - Disclaimer - Privacy