Results 41 to 50 of about 20,867 (163)

Unveiling Solidification Mechanism and Balanced Strength–Ductility Synergy of Eutectic High‐Entropy Alloys

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Eutectic high‐entropy alloys (EHEAs) have attracted significant attention due to their balanced mechanical properties and promising applications. Nonetheless, the correlation between the solidification mechanism of eutectic microstructures and their mechanical properties remains elusive.
Yi Qin   +15 more
wiley   +1 more source

A study of elasticity deformation of polymethylene chain(聚亚甲基链的弹性形变研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2001
本文采用旋转异构态模型,对聚亚甲基链受到无相变的弹性形变后的热力学性质进行研究,计算出在不同形变时聚亚甲基链体系的自由能、内能等热力学函数,同时还分析了应力与弹性形变的关系以及内能对弹性形变的贡献.
JIANGZhou-ting(姜舟婷)   +2 more
doaj   +1 more source

Investigate the Effect of Resveratrol on Postovulatory Aging of Mouse Oocytes [PDF]

open access: yes, 2016
大多数辅助生殖技术在体外操作,随着操作时间的延长,未受精的第二次减数分裂中期的卵母细胞会经历老化的过程,此过程限制了卵母细胞发展的潜力和受精的能力,因此如何延缓卵母细胞的老化为操作争取更多的时间是提高辅助生殖技术成功率的关键。然而,至今仍没有合适的方法能克服卵母细胞在体外发生的老化。本文的研究目的是探讨白藜芦醇是否可以改善排卵后老化的卵母细胞在体外发生的不良结局,之前有研究表明白藜芦醇可以提高不同物种在体外受精的概率。我们用小鼠第二次减数分裂中期的卵母细胞作为对照组 ...
刘蕊
core  

Ultrahigh‐Strength Soft‐Magnetic NiFeCoAl Multi‐Principal Element Alloys Enabled by Multiscale Heterostructure Design

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Soft‐magnetic materials (SMMs) are indispensable for electrification and sustainable energy systems, yet their inherent mechanical fragility fundamentally limits applications under severe mechanical stresses. Enhancing the yield strength of SMMs is essential to prevent the degradation in magnetic performance and failure from plastic ...
Nairan Wang   +6 more
wiley   +1 more source

狮弓蛔线虫(TOXASCARISLEONINA)的形态学研究

open access: yes野生动物学报, 1989
本文对狮弓蛔虫(Toxascaris leonina)虫体及其虫卵进行了全面而系统的形态学研究。本项研究使用饱和盐水漂浮法对哈尔滨动物园猫科动物进行粪检,用盐酸左旋咪唑进行驱虫,对获得的虫体及其虫卵分别利用光学显微镜和电子显微镜进行了形态学研究。在国内首次利用电子扫描显微镜和电子透射显微镜对获得的狮弓蛔虫虫体及虫卵进行了形态学的观察。发现了一些过去未知的结构:(1)卵黄膜的超显微结构(2)细齿形态与排列方式(3)雄虫的尾感器(4)雄虫肛门前缘的乳头状突起(5)唇尖部的口孔与唇片的连接方式和部位(6 ...
车丽美   +6 more
doaj  

The molecular mechanism of antioxidant effect of astaxanthin and preparation of its nanosuspensions [PDF]

open access: yes, 2012
虾青素(astaxanthin,3,3'-二羟基-4,4'-二酮-β,β'胡萝卜素)属于叶黄素类β-胡萝卜素。研究发现虾青素对人类健康很有益处,对许多疾病都有很好的治疗保护作用。它主要的药理作用包括:抗氧化、抗肿瘤、抗炎、对心血管保护作用及神经保护作用等。 前期研究表明,虾青素的抗溃疡作用与氧化应激密切相关,但未在分子水平进行深入研究。因此,本课题以胃癌细胞为研究对象,采用Westernblot法检测虾青素刺激后氧化还原信号通路关键蛋白的激活情况,通过DCFH-DA法检测细胞内ROS的改变 ...
梁信芳
core  

Effect of Worm‐Like Amorphous Phase on Corrosion Resistance and Antibacterial Properties of NiTiCu Alloy

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT By adding CuO, the worm‐like amorphous phase and atomic clusters were simultaneously introduced, enabling the (Ni40Ti40Cu20)99.9O0.1 alloy micron columns to exhibit a uniform flow strain of over 40% and a strength of over 2.5 GPa during compression.
Huwen Ma   +13 more
wiley   +1 more source

4 种尸食性蝇类卵的表面超微结构

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2000
【目的】明确尸食性蝇类卵的形态, 以便于在医学和法医学中的应用。【方法】用扫描电镜机观察杭州地区 4 种 尸食性蝇类卵的形态。【结果】丝光绿蝇、大头金蝇、巨尾阿丽蝇和厩腐蝇卵的超微结构形态各异, 卵的大小、表面形态、中区、 孵出线、卵孔和垂柱皆为重要的鉴别特征。【结论】通过卵壳超微结构可区分常见尸食性蝇类。
王江峰
doaj  

Development of Radiolabeled tumor-specific targeting peptides for PET Imaging [PDF]

open access: yes, 2015
多肽具有优良的药动学特性和生物学活性,因此在PET分子影像领域,多肽类分子影像探针展现出广阔的应用前景和优势。本课题利用AlF螯合法标记多肽,开发出一系列PET探针,并对相应探针进行体外及体内生物学评价。本课题具体研究内容可分为四部分。 第一部分,肝癌是最常见也是最致命的癌症之一,对于肝癌转移复发目前尚无行之有效的诊断、治疗方法。本研究通过固相法合成NOTA-G-TMTP1,并利用18F标记制得PET探针[18F]AlF-NOTA-G-TMTP1。[18F]AlF-NOTA-G-TMTP1标记产率为 ...
李业森
core  

Designing 3d Transition‐Metal Doped g‐C3N4 Monolayer for Enhanced Bifunctional Oxygen Evolution/Reduction Reactions Activity: Defect Physics and Constant‐Potential Study

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Graphitic carbon nitride (g‐C3N4) doped with 3d transition metals (3d‐TM@g‐C3N4) has gained attention as a noble metal‐free alternative for oxygen evolution and reduction reactions (OER/ORR). Yet the key mechanisms driving its performance remain debated, especially across different charge states.
Jing Zhang   +6 more
wiley   +1 more source

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