MgO缓冲层对Si衬底上制备Fe3Si薄膜性能的影响

采用磁控溅射方法和热加工工艺在n型Si衬底上溅射不同厚度的MgO层并制备Fe-Si薄膜层,退火后形成Fe3Si/MgO/Si多层膜结构.利用MgO缓冲层对退火时Si衬底扩散原子进行屏蔽,并分析MgO层对Fe3Si薄膜结构和电学性质的影响.通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和四探针测试仪对Fe3Si薄膜的晶体结构、表面形貌、断面形貌和电阻率进行表征与分析.研究结果表明:当MgO层厚度为20 nm时生成Fe0.9Si0.1薄膜,当厚度为50,100,150和200 nm时都生成了Fe3Si薄膜,生成的Fe3Si和Fe0.9Si0.1薄膜以(110)和(211)取向为主.随MgO缓冲层厚度增加,Si衬底扩散原子对Fe3Si薄膜的影响减小,Fe3 Si薄膜的晶格常数逐渐减小,晶粒大小趋向均匀,平均电阻率呈现先增大后减小趋势.研究结果为后续基于Fe3 Si薄膜的器件设计与制备提供了参考.     

Vivi在便携式心电监护系统设计中的应用

针对心电监护系统在体积、功能、实时性等方面的不足,以S3C2440为中央处理器设计了一款便携式心电监护系统,具有体积小、成本低、功能强、实时性好等特点,并在此基础上研究了Vivi在心电监护系统中的移植。经测试,移植的Vivi在设计的心电监护系统硬件平台上能稳定运行。     

Thermal characteristic of Cu-Cu bonding layer in 3-D integrated circuits stack

Copper (Cu) thermo-compression bonding of wafers can be used to fabricate multi-layer three-dimensional (3-D) integrated circuits (ICs). This work examines the thermal characteristic of the Cu bonding layer and demonstrates experimentally that Cu bonding layer can act as a spreading layer that helps in heat dissipation of bonded 3-D ICs stack more efficiently compared to silicon dioxide bonding layer. The use of Cu bonding layer in a double-layer stack of ICs provides better cooling by as much as 9 °C compared to oxide bonding interface.     

氧化铝陶瓷的低温钼金属化研究

采用BaO-Al2O3-SiO2（BAS）微晶玻璃的母体玻璃作为烧结助剂,在氧化铝陶瓷表面低温烧结Mo金属化层。研究了金属化烧结温度及BAS含量对样品抗拉强度的影响,讨论了金属化机理。结果表明：以BAS微晶玻璃的母体玻璃作为烧结助剂,可在1500~1550℃烧成Mo金属化层,金属化层致密,连接样品的抗拉强度大于260 MPa。     

Network aspects of integrating 5G and satellite communication

Since 2017, 3rd Generation Partnership Program (3GPP) is working on integration of satellite communication in 3GPP. This paper discusses the results of the work on service and network architecture aspects in 3GPP Technical Specification Group (TSG) Service and System Aspects (SA) and 3GPP TSG Core Networks and Terminals (CT). This paper does not discuss radio aspects as are specified in 3GPP TSG radio access network (RAN). 3GPP first specified requirements and use cases for satellite access. Subsequently, architecture and protocol specifications were created for integration scenarios, direct access, network selection, mobility management, and satellite backhaul with quality of service (QoS). Also, impacts of regulatory aspects on satellite integration have been discussed in 3GPP. With the completion of Release 17, 3GPP specifications are now ready for implementation of integrated 5G satellite networks. 3GPP will continue with further development of satellite integration in Release 18 and Release 19.     

Magnesium Ion Doping and Micro-Structural Engineering Assist NH4V4O10 as a High-Performance Aqueous Zinc Ion Battery Cathode

Layered ammonium vanadate materials exhibit significant mass-specific capacity and ion transport rate due to their small molecular weight and large ionic radius. However, the strong electrostatic interactions of Zn²⁺ and V–O bonds and the fragile ionic bonding of N-H^…O bonds hinder their development. Therefore, this work reports Mg²⁺ doping NH₄V₄O₁₀ materials accompanied by flower-like morphology to lower the migration energy barrier and inhibit amine dissolution. Owing to the 3D-flower-like morphology and the combined impact of Mg²⁺ and structural water, the binding of Zn^2+…V-O is significantly enhanced and additional ion channels were constructed. Pre-intercalated Mg²⁺ enhances the structural integrity and prevents irreversible deammoniation from obtaining excellent cyclic stability. Density functional theory (DFT) calculations show that MNVO provides a smoother Zn²⁺ diffusion path with a lower migration barrier. Benefited from these advantages, the MNVO cathode exhibits a high specific capacity of 410 mAh g⁻¹ at 0.1 A g⁻¹, satisfactory cyclic stability (90.2 % capacity retention at 10 A g⁻¹ after 5000 cycles), and capable rate ability (118 mAh g⁻¹ at 25 A g⁻¹) within 0.4-1.5 V. Furthermore, the zinc ion storage mechanism in the MNVO cathode is investigated through multiple analyses.     

自适应三维分数阶微分增强算法

针对三维数字图像在重构预处理阶段分辨率不高、模糊等影响重构精度的问题,提出了基于自适应三维分数阶微分的增强算法。在将二维分数阶微分推广应用至三维的基础上,尝试性地基于图像自身梯度信息和相邻体素间梯度变化构造了自适应三维分数阶微分阶数,并给出了三维离散滤波模板。利用三维切片图像自身梯度信息解决了不同属性图像及不同图像区域最优的分数阶微分阶数不同的问题,提高了实时处理效率。将自适应增强算法应用至三维边缘曲面追踪算法,可以重构出精度更高的三维数字图像。     

基于嵌入式系统的触摸屏驱动设计与实现

为了满足触摸屏性能良好、运行稳定精度高的要求,本文提出了一种基于嵌入式系统的触摸屏驱动设计与实现方法。本方案以S3C2410微处理器为核心,采用嵌入式操作系统,设计与实现触摸屏驱动程序,测试证明本驱动工作高效、稳定。     

Lateral Inhomogeneity in the Electronic Structure of a Conjugated Poly(3‐hexylthiophene) Thin Film

How annealing influences the morphology of a highly regioregular poly(3‐hexylthiophene) (RR‐P3HT) film at the substrate interface as well as the lateral inhomogeneity in the electronic structure of the film are elucidated. Whereas previous studies have reported that high‐molecular‐weight (MW) RR‐P3HT films tend to show low crystallinity even after annealing, it is found that high‐MW RR‐P3HT does show high crystallinity after annealing at high temperature for a long time. Photoemission electron microscopy (PEEM), X‐ray photoemission spectroscopy, and ultraviolet photoemission spectroscopy results clearly resolve a considerable lateral inhomogeneity in the morphology of RR‐P3HT film, which results in a variation of the electronic structure depending on the local crystallinity. The PEEM results show how annealing facilitates crystal growth in a high‐MW RR‐P3HT film.     

MIMO检测技术在LTE系统中的应用研究

随着移动通信的发展,新一代移动通信标准LTE对传输速率和系统容量等提出了更高的要求,这就需要采用更先进的技术来实现更高的传输速率和更好的传输质量。多输入多输出（MIMO,MultipleInputMultipleOutput）技术就是实现高速传输,提高传输质量的重要途径。本文对MIM0检测技术在LTE系统中的应用进行了分析与研究。