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Engineering the spectra of photon triplets generated from micro/nanofiber

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Chinese Physics B 2024年第3期33卷 408-414页

作者：瞿川郭东琴李笑笑刘振旗赵义张胜海卫正统 The College of Basic Department Information Engineering UniversityZhengzhou 450000China

Quantum light sources are the core resources for photonics-based quantum information *** investigate the spectral engineering of photon triplets generated by third-order spontaneous parametric down-conversion in micro/*** phase mismatching at one-third pump frequency gives rise to non-degenerate photon triplets,the joint spectral intensity of which has an elliptical locus with a fixed eccentricity of√6/***,we propose a frequency-division scheme to separate non-degenerate photon triplets into three channels with high heralding efficiency for the first *** an appropriate pump wavelength can compensate for the fabrication errors of micro/nanofiber and also generate narrowband,non-degenerate photon triplet sources with a high signal-to-noise ***,the long-period micro/nanofiber grating introduces a new controllable degree of freedom to tailor phase matching,resulting from the periodic oscillation of *** this scheme,the wavelength of photon triplets can be flexibly tuned using quasi-phase *** study the generation of photon triplets from this novel perspective of spectrum engineering,and we believe that this work will accelerate the practical implementation of photon triplets in quantum information processing.

关键词： photon triplets micro/nanofiber spectrum engineering

Ectopic expression of VRT-A2 underlies the origin of Triticum polonicum and Triticum petropavlovskyi with long outer glumes and grains

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Molecular Plant 2021年第9期14卷 1472-1488页

作者： Jing Liu Zhaoyan Chen Zhihui Wang Zhaoheng Zhang Xiaoming Xie Zihao Wang Lingling Chai Long Song Xuejiao Cheng Man Feng Xiaobo Wang Yanhong Liu Zhaorong Hu Jiewen Xing zhenqi Su Huiru Peng Mingming Xin Yingyin Yao Weilong guo Qixin Sun Jie Liu Zhongfu Ni State Key Laboratory for Agrobiotechnology and Key Laboratory of Crop Heterosis and Utilization(MOE)and Beijing Key Laboratory of Crop Genetic Improvement China Agricultural UniversityBeijing 100193P.R.China

Polish wheat (Triticum polonicum) is a unique tetraploid wheat species characterized by an elongated outer glume. The genetic control of the long-glume trait by a single semi-dominant locus, P1 (from Polish wheat), was established more than 100 years ago, but the underlying causal gene and molecular nature remain elusive. Here, we report the isolation of VRT-A2, encoding an SVP-clade MADS-box transcription factor, as the P1 candidate gene. Genetic evidence suggests that in T. polonicum, a naturally occurring sequence rearrangement in the intron-1 region of VRT-A2 leads to ectopic expression of VRT-A2 in floral organs where the long-glume phenotype appears. Interestingly, we found that the intron-1 region is a key ON/OFF molecular switch for VRT-A2 expression, not only because it recruits transcriptional repressors, but also because it confers intron-mediated transcriptional enhancement. Genotypic analyses using wheat accessions indicated that the P1 locus is likely derived from a single natural mutation in tetraploid wheat, which was subsequently inherited by hexaploid T. petropavlovskyi. Taken together, our findings highlight the promoter-proximal intron variation as a molecular basis for phenotypic differentiation, and thus species formation in Triticum plants.

关键词： long glume P1 species differentiation T.polonicum VRT-A2

大数据时代政府绩效管理述评:实践、议题与展望

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中国科技论坛 2022年第1期 172-179页

作者：吴振其郭诚诚北京师范大学政府管理学院北京100875

政府绩效管理作为一种改进公共责任和提升政府绩效治理的工具,在全球不同国家和地区得到广泛应用。大数据时代为政府绩效管理创新提供了工具与思维,也吸引了学者越来越多的关注。为了更好地了解大数据时代政府绩效管理研究的现状并进一... 详细信息

政府绩效管理作为一种改进公共责任和提升政府绩效治理的工具,在全球不同国家和地区得到广泛应用。大数据时代为政府绩效管理创新提供了工具与思维,也吸引了学者越来越多的关注。为了更好地了解大数据时代政府绩效管理研究的现状并进一步推动理论对话,本文从数据地位、实践探索和研究议题3个维度系统梳理相关文献。研究发现:数据作为链接绩效管理与治理要素的资源,为政府绩效管理提供了数据、技术以及思维的革新,尤其在公共服务和社会治理实践中取得良好成效,但也存在数据孤岛、绩效信息收集和使用不到位等诸多问题;理论研究聚焦于政府绩效数据、评估以及管理的数字化转型,并对研究视野实现了进一步拓展。但是,现有研究在理论探讨和研究层次上存在一些不足,未来需要更微观地探究影响数据在政府绩效管理的因素,以及系统化探究绩效信息、绩效评估到数字化转型之间的协调关系,同时要引入公共价值视角,平衡技术理性与价值理性。

关键词：大数据政府绩效实践探索争论与展望

从高音喇叭到低声微信群:乡村公共性再生产与社会治理转型——基于一个华北村庄的田野调查

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中国农村观察 2023年第2期 34-52页

作者：吴振其郭诚诚北京师范大学政府管理学院

人口流动与乡村公共性的互动关系是社会学理论研究和实践探索的核心话题,更是乡村社会治理的关键命题。大众媒介作为乡村公共性的载体,发挥着联结整合的作用,是推动乡村社会治理变革的技术支撑。通过提炼“媒介传播-公共性再生产-治理... 详细信息

人口流动与乡村公共性的互动关系是社会学理论研究和实践探索的核心话题,更是乡村社会治理的关键命题。大众媒介作为乡村公共性的载体,发挥着联结整合的作用,是推动乡村社会治理变革的技术支撑。通过提炼“媒介传播-公共性再生产-治理重构”分析框架,本文以华北前赵固村为典型案例展开分析。研究发现:高音喇叭作为早期扎根乡土的适宜媒介和基层治理工具,表现出具有权威主导性的单向管控特征。社会结构转型使高音喇叭经历了从“国家象征”到“广告载体”祛魅化的角色嬗变,高音喇叭的信息传播功能受时空限制而明显削弱。面对流动性日益增强的乡村社会中乡村公共性解体与乡村社会治理脱域,数字赋能下的村务微信群成为乡村公共性再生产与社会治理转型的重要载体。村务微信群使村民实现了跨时空的“共同在场”,塑造了虚拟的熟人社会,增进了村民之间的社会关联,强化了村庄共同体意识,推动了互动治理的形成,为乡村善治的实现奠定了基础。

关键词：高音喇叭微信群乡村公共性社会治理

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A natural variation in Ribonuclease H-like gene underlies Rht8 to confer“Green Revolution”trait in wheat

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Molecular Plant 2022年第3期15卷 377-380页

作者： Lingling Chai Mingming Xin Chaoqun Dong Zhaoyan Chen Huijie Zhai Junhong Zhuang Xuejiao Cheng Naijiao Wang Jia Geng Xiaobo Wang Ruolin Bian Yingyin Yao Weilong guo Zhaorong Hu Huiru Peng Guihua Bai Qixin Sun zhenqi Su Jie Liu Zhongfu Ni State Key Laboratory for Agrobiotechnology and Key Laboratory of Crop Heterosis and Utilization(MOE)and Beijing Key Laboratory of Crop Genetic Improvement China Agricultural UniversityBeijingChina School of Life Science and Technology Henan Institute of Science and TechnologyXinxiangChina Center for Crop Functional Genomics and Molecular Breeding China Agricultural UniversityBeijingChina State Key Laboratory for Crop Genetics and Germplasm Enhancement Nanjing Agricultural UniversityNanjingChina USDA–ARS Hard Winter Wheat Genetics Research UnitManhattanKSUSA

Dear Editor,Introduction of gibberellin(GA)-insensitive Reduced height(Rht)genes,Rht-B1b and Rht-D1b,has resulted in the“Green Revolution”in modern wheat cultivars(Triticum aestivum)that has skyrocketed wheat grain yields worldwide since the 1960s(Peng et al.,1999;Velde et al.,2021).However,Rht-B1b/D1b also reduce coleoptiles,which is undesired in dryland regions where deep planting is essential for seedling establishment(Rebetzke et al.,1999,Rebetzke et al.,2001;Ellis et al.,2004).

关键词： aestivum seedling cultivar

3D打印制备核素分布高度均匀的弥散型陶瓷核燃料芯块

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中国科学技术大学学报 2020年第4期50卷 436-441页

作者：廉超郭林常振旗中国科学技术大学物理学院安徽合肥230026

核燃料微球在弥散型核燃料芯块中的分布均匀性对核燃料芯块的性能影响很大,是高性能核燃料的重要参数之一.提出了一种提高可裂变核素在芯块中分布均匀性的弥散型核燃料制备方法.首次提出将基于选择性激光烧结技术(selective laser sinte... 详细信息

核燃料微球在弥散型核燃料芯块中的分布均匀性对核燃料芯块的性能影响很大,是高性能核燃料的重要参数之一.提出了一种提高可裂变核素在芯块中分布均匀性的弥散型核燃料制备方法.首次提出将基于选择性激光烧结技术(selective laser sintering,SLS)的3D打印技术应用于弥散型陶瓷核燃料的制备,显著提高了核燃料微球在惰性弥散介质中的分布均匀性.详细描述了双组分陶瓷材料的3D打印技术路线的实现,并对惰性介质氧化镁的粒径、激光扫描参数和后处理过程与燃料芯块性能间的关系开展了研究.研究制备的核燃料芯块的截面图表明核燃料微球在芯块中的分布高度均匀.

关键词：弥散型核燃料芯块核素分布 3D打印选择性激光烧结技术

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新加坡政府信息安全问责制度设计与经验借鉴

征信 2023年第7期41卷 65-71页

作者：郭诚诚吴振其北京师范大学政府管理学院北京100080 西南政法大学政治与公共管理学院重庆401120

信息安全是国家治理体系的重要组成部分,政府信息安全问责是国家安全治理的基本工具之一。新加坡的政府信息安全问责制度比较成熟,构建了政府内部问责、立法和司法机构问责、社会公众问责和舆论媒体问责等多元问责主体,建立了包括执行... 详细信息

信息安全是国家治理体系的重要组成部分,政府信息安全问责是国家安全治理的基本工具之一。新加坡的政府信息安全问责制度比较成熟,构建了政府内部问责、立法和司法机构问责、社会公众问责和舆论媒体问责等多元问责主体,建立了包括执行机制、监督机制、执法审查机制和绩效评估机制的政府信息安全问责运行机制,形成了法律体系完备、多主体协同且运行可操作性强的问责体系。基于我国信息安全立法实际,建议从法律规范、行政管制、多主体问责、人才培养等方面加强和完善我国信息安全问责制度。

关键词：信息安全政府信息安全问责制度信息安全治理新加坡

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The Reversible Methylation of m6A is Involved in Plant Virus Infection

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The Reversible Methylation of m6A is Involved in Plant Virus...

中国植物病理学会2023年学术年会

作者： YUE Jianying WEI Yao SUN zhenqi CHEN Yahan WANG Haijuan guo Yuqing Fabio Pasin ZHAO Mingmin College of Plant Protection Gansu Agricultural University

N6-methyladenosine(m6 A) is the most prevalent modification in the mRNAs of many eukaryotie *** abundance and effects of m6 A are determined by dynamic interactions between its methyltransferases, demethylases, and binding *** of the alkylation B( AlkB)superfamily show RNA demethylase activity removing methyl adducts from *** erase(MTase) enzymes catalyze the addition of a methyl group to a variety of biological *** RNA immunoprecipitation sequencing of virus-infected samples showed that m6 A peaks are enriched in plant transcript 3 ’ UTR and in discrete internal and 3’ terminal regions of PPV and PVY *** addition, We find that m6 A levels in Nicotiana benthamiana( A’.benthamiana) are reduced by infection of plum pox virus and potato virus ***-regulation of A’, benthamiana AlkB homologues of the plant-specif ic ALKBH9 clade caused a significant decrease in PPV and PVY *** of NbMETTLl and NbMETTL2 caused a decrease of plum pox virus *** results suggest a general involvement of RNA methylation in potyvirus *** life cycles of plant RNA viruses are often coordinated with the mechanisms of their RNA *** appears that m6 A methylation plays a dual role during viral infection in *** the one hand, m6 A methylation acts as an antiviral immune response induced by virus infection, which inhibits viral replication or translation through the methylation of viral genome *** the other hand, plant viruses could disrupt the m6 A methylation through interacting with the key proteins of the m6 A pathway to avoid *** on this mechanism, we propose that new strategies for plant virus control could be designed with competitive antagonists of m6 A-associated proteins.

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GPS快速精密定位的随机模型研究

测绘信息与工程 2006年第6期31卷 26-28页

作者：郭秋英胡振琪中国矿业大学(北京)土地复垦与生态重建研究所

综合与归纳了GPS精密定位的三种比较实用的随机模型,提出了将这三种随机模型用于GPS快速精密定位中,通过两个实例分析了三种随机模型对GPS快速精密定位的精度影响,得出几点有益的结论。

关键词： GPS快速精密定位随机模型 MINQUE 最小二乘残差