一种新的用于无线Ad hoc网络中视频传输的多路径包调度算法

该文提出了一种新的在无线Ad hoc网络中进行视频传输的多路径包调度算法(MPPA).该算法充分考虑到视频流传输的特殊QoS要求,针对视频流中的每个数据包进行操作,通过计算将其指定在某条路径上传输.避免了传统多路径传输中的接收端数据包乱序和重新排序的问题,有效地减小了接收端的启动延时和缓冲区需求.同时仿真结果验证了上述理论的正确性.     

短沟道MOSFET阈值电压辐照增强漂移效应

本文对γ辐照环境下,小尺寸MOSFET的性能进行了研究,发现了短沟MOSFET阈值电压辐照增强漂移效应;提出了辐照损伤电荷非均匀分布概念;开发了二维数值模拟程序,对辐照损伤电荷引起的器件物理作用进行了分析;建立了辐照环境下短沟道MOSFET的简化模型,成功地解释了实验现象;在理论分析的基础上,提出了适用于VLSI的抗核加固措施,并经实验证实其有效性。     

基于球形微粒的光学共振实现室温下的持久光谱烧孔

基于微腔光学共振机制，实现了尼罗蓝（ＮｉｌｅＢｌｕｅ）分子掺杂的微米尺寸球形聚合物微粒体系的室温持久光谱烧孔．该研究对于探索室温频域光存贮新机制新材料具有意义。     

SiO2/Si光子晶体透射特性的数值研究

为了了解电磁波在2维三角晶格SiO2/Si光子晶体的传输特性,利用时域有限差分方法进行了数值模拟和计算,并研究了SiO2介质柱的形状和入射波模式的变化对晶体透射特性的影响.计算后得到多种情况下该光子晶体的透射率与入射光频率的关系曲线.结果表明,禁带的宽度和位置与构成光子晶体中SiO2的形状有关,SiO2柱半径变大则禁带变宽且禁带中心频率变大,半径为0.4a时,禁带宽度达到最大值.与TM模相比,TE模入射时,光子晶体更易形成禁带.这为光子晶体的实验制作和应用提供了理论依据.     

4H-SiC肖特基微型同位素电池(英文)

半导体同位素电池由于其寿命长、集成性优良、环境适应性强等特点成为解决MEMS能源问题的理想手段。利用4H-SiC材料的宽禁带特性,制造了4H-SiC肖特基同位素电池。对电池的耗尽层厚度以及掺杂浓度进行了优化设计,对肖特基金属进行了选择。使用4mCi/cm2的63Ni作为同位素电池的放射源对制造的同位素电池进行了测试。测试结果表明,该同位素电池可以获得31.3nW/cm2的功率密度、0.5V的开路电压、3.13×10-8A/cm2的短路电流密度和1.3%的转换效率。将电池的输出特性和硅基的平板型、3D结构电池输出特性进行了比较,证明4H-SiC肖特基同位素电池能够获得较高的功率密度。电池的性能可通过提升势垒高度、提高工艺质量、更换同位素等方式得到提高。     

Solvent‐Assisted Low‐Temperature Crystallization of SnO2 Electron‐Transfer Layer for High‐Efficiency Planar Perovskite Solar Cells

A high‐quality polycrystalline SnO₂ electron‐transfer layer is synthesized through an in situ, low‐temperature, and unique butanol–water solvent‐assisted process. By choosing a mixture of butanol and water as a solvent, the crystallinity is enhanced and the crystallization temperature is lowered to 130 °C, making the process fully compatible with flexible plastic substrates. The best solar cells fabricated using these layers achieve an efficiency of 20.52% (average 19.02%) which is among the best in the class of planar n–i–p‐type perovskite (MAPbI₃) solar cells. The strongly reduced crystallization temperature of the materials allows their use on a flexible substrate, with a resulting device efficiency of 18%.     

InP中皮秒快速现象

利用测量瞬态反射谱的方法，探索了掺硫、铁、锌以及非掺杂的ＩｎＰ中载流子寿命，观察到非掺杂ＩｎＰ中载流子寿命最长约６０ｐｓ，掺锌ＩｎＰ中载流子寿命３８ｐｓ居中，掺硫和掺铁的寿命最短约１ｐｓ掺硫、铁和锌的ＩｎＰ中载流子寿命下降，是由于掺杂引入了复合中心，这一结果已被喇曼光谱所证实。     

Organic Cation‐Dependent Degradation Mechanism of Organotin Halide Perovskites

The applications of organotin halide perovskites are limited because of their chemical instability under ambient conditions. Upon air exposure, Sn²⁺ can be rapidly oxidized to Sn⁴⁺, causing a large variation in the electronic properties. Here, the role of organic cations in degradation is investigated by comparing methylammonium tin iodide (MASnI₃) and formamidinium tin iodide (FASnI₃). Through chemical analyses and theoretical calculations, it is found that the organic cation strongly influences the oxidation of Sn²⁺ and the binding of H₂O molecules to the perovskite lattice. On the one hand, Sn²⁺ can be easily oxidized to Sn⁴⁺ in MASnI₃, and replacing MA with FA reduces the extent of Sn oxidation; on the other hand, FA forms a stronger hydrogen bond with H₂O than does MA, leading to partial expansion of the perovskite network. The two processes compete in determining the material's conductivity. It is noted that the oxidation is a difficult process to prevent, while the water effect can be largely suppressed by reducing the moisture level. As a result, FASnI₃‐based conductors and photovoltaic cells exhibit much better reproducibility as compared to MASnI₃‐based devices. This study sheds light on the development of stable Pb‐free perovskite optoelectronic devices through new material design.     

一种远程控制射频切换开关的实现方法

本文为有线电视前端机房提供一种低成本的远程控制方式,该方式下,值班人员无需进入机房手工切换,在操作台即可实现对主备路射频信号的控制.