折-衍混合超广角视场目镜系统的设计

在传统的超广角 (70°)赛得莫尔 (Scidmore)目镜的基础上 ,设计了两个折衍混合 70°视场的目镜。其中一个混合系统含有两个折衍单透镜 ,另一个含有一个折衍单透镜。所设计的混合系统与赛得莫尔目镜进行了像差和结构的比较 ,表明折衍混合目镜系统不仅在诸如垂轴像差、垂轴色差、平均场曲等光学性能方面优于传统的赛得莫尔目镜系统 ,而且在尺寸和重量上有非常显著的减少。最后讨论了衍射面的结构参量。     

投影式头盔物镜设计在视空间的性能评价

对一款折衍混合投影式头盔(Head-mounted projective displays,HMPDs)物镜进行了精确的视空间评价,并给出了详细的评价步骤和评价结果。在对调制传递函数(MTF)进行评价时,充分考虑了人眼的焦距和瞳孔对评价结果的影响,给出了调节和像散所造成的分辨力损失的计算公式。评价结果显示:对于3 mm瞳孔,该系统中心视场调制传递函数在0.5 cycles/(′)达到了0.55,达到了人眼的最小分辨角(1′)。当眼睛注视投影像面中心时,轴外点最大需要0.35D的调节量,由此造成的分辨力损失最大为3.5′。由于像散造成的分辨力损失最大只有1.1′。横向色差和二级光谱最大值分别只有0.57′和0.17′,均小于人眼的最小分辨角。这些结果证明此设计满足投影式头盔物镜的使用需要。该方法适用于所有的头盔系统在视空间的性能评价。     

Ag-MgF2复合纳米金属陶瓷薄膜的微结构及吸收光谱特性研究

对用真空蒸发技术制备的Ag-MgF2复合纳米金属陶瓷薄膜（Ag的质量分数为0.15、0.20、0.30）的微结构及吸收光谱特性进行了研究。微结构分析表明薄膜由平均粒径约18nm的fcc-Ag纳米晶粒嵌埋于主要呈非晶态的MgF2基体中所组成。对吸收光谱的研究表明，Ag纳米微粒的表面离子共振吸收峰出现在λ＝412nm-417nm波段范围内。随着Ag组分增加，吸收峰强度下降，呈现轻微红移并且逐渐宽化。     

Light-emitting conjugated polymers with microporous network architecture: interweaving scaffold promotes electronic conjugation, facilitates exciton migration, and improves luminescence

Herein we report a strategy for the design of highly luminescent conjugated polymers by restricting rotation of the polymer building blocks through a microporous network architecture. We demonstrate this concept using tetraphenylethene (TPE) as a building block to construct a light-emitting conjugated microporous polymer. The interlocked network successfully restricted the rotation of the phenyl units, which are the major cause of fluorescence deactivation in TPE, thus providing intrinsic luminescence activity for the polymers. We show positive "CMP effects" that the network promotes π-conjugation, facilitates exciton migration, and improves luminescence activity. Although the monomer and linear polymer analogue in solvents are nonemissive, the network polymers are highly luminescent in various solvents and the solid state. Because emission losses due to rotation are ubiquitous among small chromophores, this strategy can be generalized for the de novo design of light-emitting materials by integrating the chromophores into an interlocked network architecture.     

Dependence of electrical field and photoresponse on multiplication region thickness for GaN APDs

A visible-blind ultraviolet GaN back-illuminated avalanche photodiode with separate absorption and multiplication regions (SAM APDs) are simulated based on drift-diffusion equation. The current–voltage characteristics of the device have been numerically obtained. The result is in good agreement with the experimental data. It was found that the thickness of the multiplication layer is important to improve the electrical field profiles and spectral response characteristics. A peak responsivity of 106.5 mA/W is achieved at 364 nm corresponding to the cutoff wavelength of GaN.     

中高能质子与核碰撞反应机制的研究

用量子分子动力学模型,在质子能量为200MeV、585MeV和1000MeV的情况下,对P+⁵⁶Fe的碰撞反应机制进行了研究,并计算了核子能谱、碎块质量分布随时间的演化以及中子发射的双微分截面等,得到了合理的结果.     

不同厚度溅射Ag膜的微结构及光学常数研究

用直流溅射法在室温Si基片上制备了4．9nm-189.0nm范围内不同厚度的Ag薄膜，并用X射线衍射及反射式椭偏光谱技术对薄膜的微结构和光学常数进行了测试分析。结构分析表明：制备的Ag膜均呈多晶状态，晶体结构仍为面心立方；随膜厚增加薄膜的平均晶粒心潮6．3nm逐渐增大到14．5nm；薄膜晶格常数均比标准值（0．40862nm)稍小，随膜厚增加，薄膜晶格常数由0．40585nm增大到0.40779nm。250nm-830nm光频范围椭偏光谱测量结果表明：与Johnson的厚Ag膜数据相比，我们制备的Ag薄膜光学折射率n总体上均增大，消光系数k变化复杂；在厚度为4．9nm-83.7nm范围内，实验薄膜的光学常数与Johnson数据差别很大，厚度小于33．3nm的实验薄膜k谱线中出现吸收峰，峰位由460nm红移至690nm处，且其对应的峰宽逐渐宽化；当膜厚达到约189nm时，实验薄膜与Johnson光学常数数据已基本趋于一致。     

具$w_0$-距离度量空间中$p$-逼近$\alpha$-$\eta$-$\beta$-拟压缩的最佳逼近点定理

本文提出了一类称为$p$-逼近$\alpha$-$\eta$-$\beta$-拟压缩的新的非自映射,并引进了关于$\eta$的$\alpha$-逼近可容许映射和关于$\eta$的$(\alpha,d)$正则映射的概念.基于这些新概念,在$w_0$-距离度量空间中研究了此类新压缩最佳逼近点的存在唯一性,并给出了一个新的定理,推广和补充了文[Ayari, M. I. et al. Fixed Point Theory Appl., 2017, 2017: 16]和[Ayari, M. I. et al. Fixed Point Theory Appl., 2019, 2019: 7]中的结果.给出了一个例子来说明主要结果的有效性.进一步地,作为推论得到关于两个映射的最佳逼近点和公共不动点定理.作为其中一个推论的应用,讨论了一类Volterra型积分方程组的求解问题.     

Metal-Organic Frameworks Nanocarriers for Functional Nucleic Acid Delivery in Biomedical Applications

Metal−organic frameworks (MOFs), a distinctive funtionalmaterials which is constructed by various metal ions and organic molecules, have gradually attracted researchers′ attention from they were founded. In the last decade, MOFs emerge as a biomedical material with potential applications due to their unique properties. However, the MOFs performed as nanocarriers for functional nucleic acid delivery in biomedical applications rarely summarized. In this review, we introduce recent developments of MOFs for nucleic acid delivery in various biologically relevant applications, with special emphasis on cancer therapy (including siRNA, ASO, DNAzyme, miRNA and CpG oligodeoxynucleotides), bioimaging, biosensors and separation of biomolecules. We expect the accomplishment of this review could benefit certain researchers in biomedical field to develop novel sophisticated nanocarriers for functional nucleic acid delivery based on the promising material of MOFs.