Results 21 to 30 of about 32,420 (170)

Investigation of oxygen precipitates and the stability of denuded zone in Czochralski silicon [PDF]

open access: yes, 2016
铜在硅中不仅具有很大的扩散速率,而且随着温度的降低它的固溶度迅速下降,这两个特性使得铜原子很容易在器件制备过程中沉淀下来,严重影响硅片性能。虽然科研工作者们已经提出了多种工艺使硅片近表面处形成洁净区,但却很少对硅中的氧沉淀和洁净区的稳定性进行深入探讨。因此,本文通过实验分析了氧沉淀和洁净区的稳定性,得出以下结论: (1)研究了热处理方式和铜引入温度对洁净区的形成及其稳定性的影响。研究发现,只有Ramping-低-高热处理能使硅片内生成大量氧沉淀的同时有效形成洁净区。引入铜玷污后,RTP-低 ...
吕耀朝
core  

Interfacial Dipole Engineering With Taurine‐Modified SnO2 Electron Transport Layer for Efficient and Stable Perovskite Solar Cells

open access: yesRare Metals, EarlyView.
ABSTRACT Organic‐inorganic metal halide perovskite solar cells (PSCs) are promising for photovoltaics due to their excellent optoelectronic properties. However, achieving high efficiency and stability remains challenging, mainly due to defects and energy losses at the electron transport layer (ETL)/perovskite interface.
Jiahui Jin   +8 more
wiley   +1 more source

Design and Implementation of BUG Management System for Medical Software Projects [PDF]

open access: yes, 2015
医疗项目BUG管理系统是提高项目质量、优化测试、快捷实施、控制项目风险、提高协调利用效率和节约开发成本的重要手段。 本文介绍了医疗软件项目的BUG管理系统的设计与实现。首先,简述软件缺陷管理系统研发背景和研究软件缺陷管理系统的意义,其次,进行系统需求分析、功能设计、系统体系结构设计、数据库设计,运用JSPMVC框架进行系统架构设计。在此基础上,进行该系统各模块功能详细设计、系统实现与部署以及系统测试。最后,简单介绍了该系统在项目管理过程中发挥的作用,并展望软件缺陷管理系统的发展。系统主要功能包括 ...
刘婕
core  

Breaking Concentration Quenching for Excellent Highly Efficient and Stable Narrowband Luminescence by Structural Ordering and Defect Regulation

open access: yesRare Metals, EarlyView.
ABSTRACT Enhancing the performance of phosphor materials for wide‐color‐gamut and high‐brightness phosphor‐converted light‐emitting diodes (pc‐LEDs) represents a critical materials challenge. Improving quantum efficiency (QE) under concentration quenching constraints and maintaining thermal stability remain primary objectives.
Yuhan Zhou   +3 more
wiley   +1 more source

Research on Eddy Current Testing of Damages in Carbon Fiber Reinforced Polymers [PDF]

open access: yes, 2015
碳纤维增强树脂基复合材料因其优异的性能已被广泛应用于飞行器制造、汽车制造、化学工业、造船与电气设备等各个行业,尤其是在航空航天、船舰以及核能设备等领域受到高度重视。然而,复合材料结构件在制造和使用过程中不可避免的会因为冲击等原因产生各种类型的缺陷。此外,复合材料结构件在损坏之前几乎没有先兆,其破坏具有突然性,这一点往往造成严重的后果。因此对碳纤维增强树脂基复合材料损伤的无损检测研究具有极其重要的意义。 目前应用较多的检测碳纤维增强树脂基复合材料损伤的方法有红外检测、X射线检测以及超声检测等 ...
杜飞
core  

Carbon‐Insertion‐Engineered WS2 Hierarchical Heterostructure Enabling Superior Sodium‐Ion Storage

open access: yesRare Metals, EarlyView.
ABSTRACT Tungsten disulfide (WS2) is considered a promising anode material for sodium‐ion batteries (SIBs). However, its practical application is hindered by poor electrical conductivity, large volume changes during cycling, and sluggish ion diffusion kinetics, which lead to unsatisfactory electrochemical performance.
Xiuli Hu   +9 more
wiley   +1 more source

预测腐蚀管道剩余强度的新方法 [PDF]

open access: yes, 2004
将BP神经网络和遗传算法相结合 ,得到了一种可计算腐蚀管道剩余强度和最大允许注水压力的新神经网络。通过实例分析 ,将 7种常用规范和改进的遗传神经网络方法进行了比较。结果表明 ,不同计算方法得到的剩余强度和最大允许注水压力相差较大 ,Wes 2 80 5 - 97规范、ASMEB31G规范、CVDA— 84规范、Irwin断裂力学方法等都比J积分方法的剩余强度和最大允许注水压力偏大 ;Burdiken和DM断裂力学方法计算得到的剩余强度和最大允许注水压力比J积分偏小 ...
付道明   +4 more
core  

Selective Lithium Deposition Through 3D Copper Collector With Lithiophilic Alloy “Skins” and Curvature Boundaries for Dendrite‐Free Lithium‐Metal Anodes

open access: yesRare Metals, EarlyView.
ABSTRACT Although lithium metal has been regarded as an ideal anode material for high‐energy‐density batteries, its practical applications remain hindered by many serious challenges. Three‐dimensional (3D) porous Cu current collectors demonstrate potential in ensuring uniform Li deposition.
Meng‐Qi Zhu   +7 more
wiley   +1 more source

Investigation of oxygen precipitates and copper complex in Czochralski silicon [PDF]

open access: yes, 2015
用直拉法生长的单晶硅中,氧是最常见的杂质,硅材料制备过程使用的内吸杂工艺则是以氧沉淀及其诱生缺陷为基础。铜作为最常见的过渡族金属玷污之一,其沉淀及复合体将会较大程度地影响硅材料的性能。因此,研究氧沉淀和铜沉淀及其复合体在直拉硅单晶中的行为,除了具有重要的理论意义外,在实际生产中也可以提高硅器件的性能。本论文利用光学显微镜,傅立叶红外光谱仪及荧光光谱仪对不同热处理方式下硅中氧和铜的行为进行研究,得出的主要结论如下: (1)研究了线性升温(Ramping)的起始温度和升温速率对硅单晶中氧沉淀行为的影响 ...
谢婷婷
core  

Oxygen Vacancy Engineering of Ultrafine ZnAl2O4 Nanoparticles as a Robust Protective Layer for Dendrite‐Free and Long‐Lifespan Aqueous Zn Metal Anodes

open access: yesRare Metals, EarlyView.
ABSTRACT Aqueous zinc‐ion batteries (AZIBs) hold great promise for safe and sustainable energy storage, but their commercialization is impeded by severe Zn dendrite growth and interfacial instability. To address these challenges, we propose a defect engineering strategy employing ultrafine ZnAl2O4 (ZAO) nanoparticles (∼5 nm) with oxygen vacancy defects
Yilun Ren   +9 more
wiley   +1 more source

Home - About - Disclaimer - Privacy