$${f(\mathcal R)}$$ quantum cosmology

We have quantized a flat cosmological model in the context of the metric models, using the causal Bohmian quantum theory. The equations are solved and then we have obtained how the quantum corrections influence the classical equations.     

Afterglow Implant for Arterial Embolization and Intraoperative Imaging

Transcatheter arterial embolization (TAE) is wildly used in clinical treatments. However, the online monitoring of the thrombosis formation is limited due to the challenges of the direct visualization of embolic agents and the real-time monitoring of dynamic blood flow. Thus, we developed a photochemical afterglow implant with strong afterglow intensity and a long lifetime for embolization and imaging. The liquid pre-implant injected into the abdominal aorta of mice was rapidly transformed into a hydrogel in situ to embolize the blood vessel. The vascular embolism position can be observed by the enhanced afterglow of the fixed implant, and the long lifetime of afterglow can also be used to monitor the effect of embolization. This provides an excellent candidate in bio-imaging to avoid the autofluorescence interference from continuous light excitation. The study suggests the potential usefulness of the implant as an embolic agent in TAE and artery imaging during a surgical procedure.     

Formulas for Lagranigian and orthogonal degeneracy loci; \widetilde Q-polynomial approach

The main goal of the paper is to give explicit formulas for the fundamental classes of Schubert subschemes in Lagrangian and orthogonal Grassmannians of maximal isotropic subbundles as well as some globalizations of them. The used geometric tools overlap appropriate desingularizations of such Schubert subschemes and Gysin maps for such Grassmannian bundles. The main algebraic tools are provided by the families of and -polynomials introduced and investigated in the present paper. The key technical result of the paper is the computation of the class of the (relative) diagonal in isotropic Grassmannian bundles based on the orthogonality property of and polynomials. Some relationships with quaternionic Schubert varieties and Schubert polynomials for classical groups are also discussed.     

Double Circulant Codes over \mathbb{Z}_4 and Even Unimodular Lattices

With the help of some new results about weight enumerators of self-dual codes over we investigate a class of double circulant codes over , one of which leads to an extremal even unimodular 40–dimensional lattice. It is conjectured that there should be Nine more constructions of the Leech lattice     

大靶面中波红外连续变焦光学系统设计

开展了大靶面中波红外连续变焦光学系统设计研究,设计出了一种机械正组补偿式连续变焦光学系统。该系统的工作波段为3.7~4.8 m,焦距为50~580 mm,F数为4.5;靶面直径为24.6 mm,适用于目前新推出的像元间距为15 m 的1280×1024元制冷型中波红外焦平面探测器。在实现长焦距、高分辨率的同时,可保持光学系统具有大视场角,进而有效提高机载光电系统的目标搜索与识别能力。设计结果表明,本文系统的成像质量高,在30 1p／mm空间频率处的调制传递函数值接近0.2。     

中波碲镉汞p-on-n高温工作技术研究

针对碲镉汞中波p-on-n技术进行研究,采用二次离子质谱仪分析注入后及退火后As离子在碲镉汞材料中的浓度分布,使用透射电镜表征激活退火后离子注入损伤修复状态,通过半导体参数测试仪评价pn结的IV特性,将探测器芯片装在变温杜瓦中测试其不同温度下的焦平面技术指标。研究结果表明,As离子注入后在碲镉汞体内形成大量缺陷,经过富汞退火后缺陷得到修复,同时As离子进一步向内扩散,制备的pn结工作稳定表明As离子得到有效激活,制备的中波p-on-n探测器芯片在120 K温度下有效像元率可以达到99%以上。     

中国电信BSS中台架构的研究与设计

分析了电信运营商在5G、云网融合时代的通信技术变革所带来的通信业的新业态、新生态圈合作挑战与机遇,结合中国电信信息化建设现状,提出了构建适应于中国电信的企业中台建设方案。以“轻门户、变应用、稳中台”的构建思路,重点介绍业务中台的构建方案。通过引入应用层、构建业务中台,实现对前端业务与市场的快捷精确响应,并通过案例介绍,验证方案的优越性与可行性。     

一种基于分步线性最优估计的全球中低纬区域电离层foF2重构方法

电离层F₂层临界频率f_oF₂是短波通信、探测和电子对抗等领域最为重要的应用参数之一. 针对全球范围内电离层测高仪分布较为稀疏的特点,基于全球电离层无线电观测站（Global Ionospheric Radio Observatory,GIRO）的测高仪实测数据,采用分步线性最优估计方法对电离层CCIR/URSI系数进行调整,实现了全球中低纬区域电离层f_oF₂的重构. 对2010—2016年的电离层f_oF₂重构结果进行分析,结果表明:在纬度变化上,中纬区域重构误差要低于低纬区域;在年变化上,重构的绝对误差和均方根误差有随太阳活动强度增强而增大的趋势,重构的相对误差无明显年变化;在季节变化上,夏季重构误差最小,其他三个季节相差不大;在地方时变化上,白天的重构误差低于夜间. 总体而言,相比于国际参考电离层(international reference ionosphere,IRI)模型,电离层f_oF₂重构的绝对误差和均方根误差分别下降了约38%和34%,验证了本文方法的有效性和可靠性.     

On a theorem of Cantor-Bernstein type for algebras

Freytes proved a theorem of Cantor-Bernstein type for algbras; he applied certain sequences of central elements of bounded lattices. The aim of the present paper is to extend the mentioned result to the case when the lattices under consideration need not be bounded; instead of sequences of central elements we deal with sequences of internal direct factors of lattices. This work was supported by Science and Technology Assistance Agency under the contract No APVT-51-032002.