检索结果-南通市图书馆

Origin of Room-Temperature Ferromagnetism for Cobalt-Doped ZnO Diluted Magnetic Semiconductor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2008年第4期25卷 1438-1441页

作者：彭龙张怀武文岐业宋远强苏桦 john q. xiao State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 Department of Physics and Astronomy University of Delaware Newark DE 19716 USA

The pure single phase of Zn0.95 Co0.05 O bulks is successfully prepared by solid-state reaction method. The effects of annealing atmosphere on room-temperature ferromagnetic behaviour for the Zn0.95 Co0.05 O bulks are investigated. The results show that the air-annealed samples has similar weak ferromagnetic behaviour with the as-sintered samples, but the obvious ferromagnetic behaviour is observed for the samples annealed in vacuum or Ar/H2 gas, indicating that the strong ferromagnetism is associated with high oxygen vacancies density. High saturation magnetization Ms = 0.73μg/Co and coercivity Hc = 233.8 Oe are obtained for the Ar/H2 annealed samples with pure single phase structure. The enhanced room-temperature ferromagnetic behaviour is also found in the samples with high carrier concentration controlled by doping interstitials Zn （Zni）.

关键词： supernova explosion proto-neutron star shock wave

自旋器件中的自旋动力学:微波领域应用的新兴科学(英文)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电子科技大学学报 2009年第5期38卷 505-523页

作者：肖强曹荣 MORIYAMAT 范欣文岐业张怀武特拉华大学物理与天文学院电子科技大学电子薄膜与集成器件国家重点实验室

自旋电子学指通过控制和利用电子自旋(而不是电荷)获得一系列新颖性能的研究领域。自旋电子器件已经成功地应用于计算机硬盘驱动器和磁性随机存储器,对IT行业的发展产生了深远的影响。这些应用都是基于自旋极化传输效应,即具有固定自旋... 详细信息

自旋电子学指通过控制和利用电子自旋(而不是电荷)获得一系列新颖性能的研究领域。自旋电子器件已经成功地应用于计算机硬盘驱动器和磁性随机存储器,对IT行业的发展产生了深远的影响。这些应用都是基于自旋极化传输效应,即具有固定自旋取向的电子穿过磁性异质结所发生的相关效应。目前,在将微波和自旋极化传输联系起来的自旋器件中的自旋动力学研究,为研制尺寸远远小于微波波长的新型微波器件提供了巨大的潜能。在这篇综述中,首先简单地介绍了自旋器件的概念;接着研究了微波实验来研究自旋电子器件的微波辅助翻转和自旋泵浦现象。前者将能够开发出高密度的计算机硬盘,而后者,结合直接电子检测技术,将能够实现小型化的无源微波探测器。

关键词：异质结微波测量自旋动力学自旋泵浦效应

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

锰掺杂氧化铜稀磁半导体薄膜的微结构和磁性

材料导报 2007年第12期21卷 115-117页

作者：赵凡张亚萍潘礼庆 HAO Zhu 邱红梅赵雪丹 john q.xiao 北京科技大学物理系北京100083 Department of Physics and Astronomy University of Delaware Newark DE 19716 USA

采用射频磁控溅射制备Mn掺杂CuO薄膜样品。X射线衍射结果说明薄膜样品为单相结构且沿(111)取向生长。通过样品的XRD精修得到样品的结构和晶格参数,掺杂后薄膜晶体结构有微小畸变。薄膜的高分辨透射电镜研究证明了对结构和晶粒大小等的... 详细信息

采用射频磁控溅射制备Mn掺杂CuO薄膜样品。X射线衍射结果说明薄膜样品为单相结构且沿(111)取向生长。通过样品的XRD精修得到样品的结构和晶格参数,掺杂后薄膜晶体结构有微小畸变。薄膜的高分辨透射电镜研究证明了对结构和晶粒大小等的精修结果,且同时说明Mn以替代Cu的形式掺入了CuO晶格中。通过对样品M-T曲线的分析,得到样品的居里温度为96.5K,近邻Mn离子之间的耦合为铁磁性,并由居里外斯拟合得到Mn离子的有效磁矩为3.1_(μB)。这说明磁性不是来自于团聚的Mn原子或铜锰的其它氧化物,而很可能来自于替住的锰离子所形成的Mn-O-Cu-O-Mn之间的铁磁性耦合。

关键词：氧化铜稀磁半导体铁磁性机理掺杂

在线全文

学校读者我要写书评

暂无评论

磁隧道结中势垒层的显微结构和电子全息研究

磁隧道结中势垒层的显微结构和电子全息研究

Left-handed materials in magnetized metallic magnetic thin films

第四届全国磁性薄膜与纳米磁学会议

作者：朱涛詹文山沈峰张泽 john q. xiao 中国科学院物理研究所磁学国家重点实验室中国科学院物理研究所磁学国家重点实验室中国科学院物理研究所北京电镜实验室中国科学院物理研究所北京电镜实验室 Department of Physics ＆ Astronomy University of Delaware Newark DE 19716

＜正＞采用磁控溅射法制备了具有楔型势垒层的磁隧道结（Py/AlOx/Py）,并运用透射电镜对该隧道结

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第1期7卷 71-75页

作者：伍瑞新 xiao john q. Department of Electronic Sciences and Engineering Nanjing UniversityNanjing 210093 China Department of Physics and Astronomy University of Delaware Newark Delaware 19716 USA

The authors＇ theoretical investigation on the high-freq.ency response of magnetized metallic magnetic films showed that magnetic films may become left-handed materials （LHMs） near the ferromagnetic resonance freq.ency of incident waves with right-handed circular polarization （RCP） and linear polarization （LP）. The freq.ency range where LHM exists depends on the waves polarization, the magnetic damping coefficient, and the ferromagnetic characteristic freq.ency corn of the film. There also exists a critical damping coefficient ac, above which the left-handed properties disappear completely.

关键词： Left-handed materials (LHMs) Magnetic thin film Ferromagnetic resonance freq.ency

Recent Strategies and Advances in Hydrogel‑Based Delivery Platforms for Bone Regeneration

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 389-439页

作者： xiao Wang Jia Zeng Donglin Gan Kun Ling Mingfang He Jianshu Li Yongping Lu Scientific and Technological Innovation Center for Biomedical Materials and Clinical Research Guangyuan Key Laboratory of Multifunctional Medical HydrogelGuangyuan Central HospitalGuangyuan 628000People’s Republic of China Jiangsu Collaborative Innovation Center of Biomedical Functional Materials Jiangsu Key Laboratory of Bio‑Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023People’s Republic of China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065People’s Republic of China

Bioactive molecules have shown great promise for effectively regulating various bone formation processes,rendering them attractive therapeutics for bone ***,the widespread application of bioactive molecules is limited by their low accumulation and short half-lives in *** have emerged as ideal carriers to address these challenges,offering the potential to prolong retention times at lesion sites,extend half-lives in vivo and mitigate side effects,avoid burst release,and promote adsorption under physiological *** review systematically summarizes the recent advances in the development of bioactive molecule-loaded hydrogels for bone regeneration,encompassing applications in cranial defect repair,femoral defect repair,periodontal bone regeneration,and bone regeneration with underlying ***,this review discusses the current strategies aimed at improving the release profiles of bioactive molecules through stimuli-responsive delivery,carrier-assisted delivery,and seq.ential ***,this review elucidates the existing challenges and future directions of hydrogel encapsulated bioactive molecules in the field of bone regeneration.

关键词： Hydrogel Bone regeneration Bioactive molecules Drug delivery Nano-/microscale carriers

A review of bio-inspired needle for percutaneous interventions

在线全文

学校读者我要写书评

暂无评论

Biomimetic Intelligence & Robotics 2022年第4期2卷 2-13页

作者： Yichi Ma xiao xiao Hongliang Ren Max q.-H.Meng Department of Mechanical Engineering University of CaliforniaBerkeley 94720USA Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Electronic Engineering The Chinese University of Hong KongHongkong 999077China

Bio-inspired design translates the knowledge of natural or biological structures or behaviors into novel theories and technologies,providing new directions for research and *** the medical needles for percutaneous intervention technology appear to be mature,biomimetic solutions become popular to further facilitate the performance of the medical *** this paper,we review the current state of bio-inspired medical needle designs for percutaneous interventions,including a variety of biomimetic mechanisms and insertion *** and experimental designs of biomimetic medical needles are classified into five groups with respect to the applications,while their characteristics are identified and *** classification and discussion will not only provide technical insights into previous studies but also identify undiscovered directions for future research.

关键词： Bio-inspired needle Biopsy needle Steerable needle

Design and evaluation of a novel biopsy needle with hemostatic function

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Mechanical Engineering 2023年第2期18卷 319-331页

作者： xiaolong ZHU Yichi MA xiao xiao Liang LU Wei xiao Ziq. ZHAO Hongliang REN Max q.-H.MENG Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering University of CaliforniaBerkeleyBerkeleyCA 48072USA Department of Electronic Engineering The Chinese University of Hong KongHong KongChina

Biopsy is a method commonly used for early cancer ***,bleeding complications of widely available biopsy are risky for *** biopsy will result in a more accurate cancer diagnosis and a decrease in the risk of *** this article,we propose a novel biopsy needle that can reduce bleeding during biopsy procedures and achieve stable *** proposed biopsy needle features a compact structure and can be operated easily by left and right hands.A predictive model for puncture force and tip deflection based on coupled Eulerian–Lagrangian(CEL)method is *** results show that the biopsy needle can smoothly deliver the gelatin sponge hemostatic plug into the *** the hemostatic plug bends,the overall delivery process is stable,and the hemostatic plug retains in the tissue without being affected by the withdrawal of the *** experiments indicate that the specimens are well obtained and evenly distributed in the groove of the outer needle without *** proposed design of biopsy needle possesses strong ability of hemostasis,tissue cutting,and tissue *** CEL model accurately predicts the peak of puncture force and produces close estimation of the insertion force at the postpuncture stage and tip position.

关键词： cancer diagnosis biopsy needle hemostatic function predictive model coupled Eulerian−Lagrangian

Plasma enhanced diamond deposition on steel and Si substrates

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2009年第5期22卷 321-329页

作者： Y.S. Li Y. Tang Wo Chen q. Yang C.xiao A. Hirose Plasma PhYsics Laboratory University of Saskatchewan Saskatoon SK S7N 5E2 Canada Department of Mechanical Engineering University of Saskatchewan Saskatoon S7N 5A9 Canada

Diamond growth on Fe-Cr-Al-Si steel and Si substrates was comparatively investigated in microwave plasma enhanced chemical vapor deposition （MPCVD） reactor with different deposition parameters. Adherent nanocrystalline diamond films were directly deposited on this steel substrate under a typical deposition condition, whereas microcrystalline diamond films were produced on Si wafer. With increasing CH4 concentration, reaction pressure, or the total gas flow rate, the q.ality of nanocrystalline diamond films formed on Fe-Cr-Al-Si substrates is gradually deteriorated in terms of density and adhesion. This impaired diamond q.ality on steels is primarily associated with a combined effect by the substrate composition and the specific process conditions that favor excessive nucleation of diamond.

关键词： Plasma CVD Diamond film Steel Si