检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

基于智能超表面的二维相扫天线

无线电通信技术 2024年第2期50卷 386-391页

作者：于瑞涛符道临熊伟陈珲杭州市钱塘区信息高等研究院浙江杭州310018 江苏赛博空间科学技术有限公司江苏南京211113 东南大学信息科学与工程学院江苏南京210096

针对传统相控阵天线设计复杂、成本高昂等问题,提出了基于智能超表面(Reconfigurable Intelligent Surface, RIS)的空间馈电二维相扫天线。该天线通过RIS技术对来自馈源的电磁波进行相位操纵,实现了天线高增益和天线波束的可重构。与传... 详细信息

针对传统相控阵天线设计复杂、成本高昂等问题,提出了基于智能超表面(Reconfigurable Intelligent Surface, RIS)的空间馈电二维相扫天线。该天线通过RIS技术对来自馈源的电磁波进行相位操纵,实现了天线高增益和天线波束的可重构。与传统相控阵天线相比,该天线具有结构简单、成本低廉、剖面极低等特点。天线原型由一块含有1 024个单元的超表面阵列、驱动模块及自支撑馈源组成,其中超表面阵列通过现场可编程门阵列(Field Programmable Gate Array, FPGA)来实时控制以满足天线波束快速切换、方向图二维实时重构等需求。超表面单元两种调控状态在6.5~10.0 GHz具有低于0.5 dB的幅度损耗,在7~10 GHz频带范围内反射相位差在180°±5°以内。天线原型在7.7、8.0、8.3 GHz的测试增益为24.72、24.92、25.06 dBi。天线±60°扫描增益滚降低于4 dB。

关键词：智能超表面相控阵天线二维扫描

在线全文

学校读者我要写书评

暂无评论

基于2 bit超表面的单阶谐波波束扫描

无线电通信技术 2024年第2期50卷 392-398页

作者：符道临于瑞涛胡源刘曦熊伟江苏赛博空间科学技术有限公司江苏南京211113 杭州市钱塘区信息高等研究院浙江杭州310018 西安电子科技大学电子工程学院陕西西安710071

波束扫描是一种广泛应用于无线通信、雷达、卫星通信和其他相关领域的技术,它允许无线信号或射线束在空间中定向、聚焦。近年提出的智能超表面时空编码方式拓展了超表面在物理维度上的自由度,使得其可以在单音波激励下完成多个频点的波... 详细信息

波束扫描是一种广泛应用于无线通信、雷达、卫星通信和其他相关领域的技术,它允许无线信号或射线束在空间中定向、聚焦。近年提出的智能超表面时空编码方式拓展了超表面在物理维度上的自由度,使得其可以在单音波激励下完成多个频点的波束扫描,但仍然面临着增益低、波束副瓣大等一系列问题。针对这些问题,提出了一种基于超表面的谐波波束扫描方法。设计并加工了一种在E面可以达到斜入射60°的角度不敏感2 bit超表面单元并组建32×32阵列。针对单元谐波状态做出精确的3 bit相位量化。通过针对不同的初始参考相位,使用多目标遗传算法进行优化,将正一阶谐波的波束副瓣压低在了-15 dB水平,完成了时空编码超表面在E面60°波束扫描,为未来在超表面时空编码谐波波束赋形提供了充分有力的方案。

关键词：超表面时空编码波束扫描副瓣压低多目标遗传算法

Mapping the glaucousness suppressor Iw1 from wild emmer wheat “PI 481521”

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2015年第1期3卷 37-45页

作者： Zongchang Xu Cuiling Yuan Jirui Wang daolin fu Jiajie Wu State Key Laboratory of Crop Biology Shandong Key Laboratory of Crop Biology Shandong Agricultural University Triticeae Research Institute Sichuan Agricultural University

Many species of Triticeae display a glaucous phenotype. In wheat, glaucousness/waxiness on spikes, leaves and shoots is controlled by wax production genes(W loci) and epistatic inhibitors(Iw loci). In this study, a suppressor of glaucousness from wild emmer wheat(Triticum turgidum ssp. dicoccoides) accession "PI 481521" was investigated in a pair of durum(T. turgidum ssp. durum cv. "Langdon", LDN)—wild emmer wheat chromosome substitution lines, LDN and "LDNDIC521-2B". Genetic analysis revealed that the non-glaucous phenotype of LDNDIC521-2Bwas controlled by the dominant glaucous suppressor Iw1 on the short arm of chromosome 2B. In total, 371 2B-specific marker differences were identified between LDN and LDNDIC521-2B. The location of the Iw1 gene was mapped using an F2 population that stemmed from LDN and LDNDIC521-2B, generating a partial linkage map that included 19 simple sequence repeats(SSR) and ten gene-based markers. On the current map, the Iw1 gene was located within the Xgwm614–BE498111 interval, and cosegregated with BQ788707,CD893659, CD927782, CD938589, and Xbarc35. Mapping of Iw1 in LDNDIC521-2B, a publically accessible and widely distributed line, will provide valuable information for marker-assisted selection of the agronomically important trait of glaucousness.

关键词： Waxiness Triticum turgidum ssp.durum T.turgidum ssp.dicoccoides Wheat 90K iSelect array

Distribution,Frequency and Variation of Stripe Rust Resistance Loci Yr10,Lr34/Yr18 and Yr36 in Chinese Wheat Cultivars

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2012年第11期39卷 587-592页

作者： Cuiling Yuan Hui Jiang Honggang Wang Kun Li Heng Tang Xianbin Li daolin fu State Key Laboratory of Crop Biology Shandong Key Laboratory of Crop BiologyShandong Agricultural University61 Daizong StreetTai'anShandong 271018China

Wheat stripe rust is a devastating disease in many regions of the world. In wheat, 49 resistance genes for stripe rust have been officially documented, but only three genes are cloned, including the race-specific resistance YrlO candidate gene （YrlOca） and slow-rusting genes Lr34/Yr18 （hereafter designated as Yrl8） and Fr36. In this study, we developed gene-specific markers for these genes and used them to screen a collection of 659 wheat accessions, including 485 Chinese cultivars. Thirteen percent and eleven percent of the tested Chinese cultivars were positive for the markers for YrlOca and Yr18nn （the resistant haplotype of YrlS）, respectively, but none were positive for the Yr36 marker. Since there is a limited use of the YrlO gene in Chinese wheat, the relatively high frequency of wheat varieties with the YrlOcG marker suggests that the identity of the YrlO gene is unknown. With regards to the Yr18 gene, 29% of the tested cultivars that are used in the Middle and Lower Yangtze Valleys＇ winter wheat zone were positive for Yrl8RH markers. A non-functional allele of Yrl8Rn was identified in ＇Mingxian 169＇, a commonly used susceptible check for studying stripe rust. The data presented here will provide useful information for marker-assisted selection for wheat stripe rust resistance.

关键词： Puccinia striiformis Stripe rust Triticum aestivum

WheatOmics:A platform combining multiple omics data to accelerate functional genomics studies in wheat

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2021年第12期14卷 1965-1968页

作者： Shengwei Ma Meng Wang Jianhui Wu Weilong Guo Yongming Chen Guangwei Li Yanpeng Wang Weiming Shi Guangmin Xia daolin fu Zhensheng Kang Fei Ni State Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural UniversityNanjing 210095China State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China State Key Laboratory of Crop Biology College of AgronomyShandong Agricultural UniversityTaian 271018China State Key Laboratory of Crop Stress Biology for Arid Areas College of AgronomyNorthwest A&F UniversityYangling 712100China State Key Laboratory for Agrobiotechnology Key Laboratory of Crop Heterosis and UtilizationBeijing Key Laboratory of Crop Genetic ImprovementChina Agricultural UniversityBeijing 100193China College of Agronomy Longzi Lake CampusHenan Agricultural UniversityZhengzhou 450046China State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biologythe Innovative Academy of Seed DesignChinese Academy of SciencesBeijing 100101China The Key Laboratory of Plant Development and Environment Adaptation Biology Ministry of EducationSchool of Life ScienceShandong UniversityQingdao 266237China

Dear Editor,Mold-breaking progress in whole-genome sequencing and rapid accumulation of multi-omics data have revolutionized the research strategies of functional genomics in wheat(Wang et al.,2018).However,how to access these vast multi-omics data and to extract key information on genes of in-terest,is still challenging for most wet-lab or field wheat re-searchers who have little bioinformatic experiences and cannot access the expensive computational ***,we pre-sent WheatOmics(http://***/,previously designated as Triticeae Multi-omics Center,http://202.***.139.32/),a free,web-accessible,and user-friendly *** not only empowers the effective access to the visualized multi-omics data of user-interested genes but also offers several distinctive and practical toolkits that can ease almost every aspect of wheat functional genomics studies(Figure 1A).

关键词： Wheat functional Figure

ZmMS1/ZmLBD30-orchestrated transcriptional regulatory networks precisely control pollen exine development

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2023年第8期16卷 1321-1338页

作者： Quancan Hou Xueli An Biao Ma Suowei Wu Xun Wei Tingwei Yan Yan Zhou Taotao Zhu Ke Xie Danfeng Zhang Ziwen Li Lina Zhao Canfang Niu Yan Long Chang Liu WeiZhao FeiNi Jinping Li daolin fu Zhong-NanYang Xiangyuan Wan Research Institute of Biology and Agriculture University of Science and Technology BeijingBeijing 100083China Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding Zhongzhi International Institute of Agricultural BiosciencesBeijing 100192China State Key Laboratory of Crop Biology College of AgronomyShandong Agricultural UniversityTaianShandong 271018China Shanghai Key Laboratory of Plant Molecular Sciences College of Life SciencesShanghai Normal UniversityShanghai 200234China

Because of its significance for plant male fertility and,hence,direct impact on crop yield,pollen exine development has inspired decades of scientific ***,the molecularmechanismunderlying exine formation and thickness remains *** this study,we identified that a previously unrecognized repressor,ZmMS1/ZmLBD30,controls proper pollen exine development in *** an ms1 mutant with aberrantly thickened exine,we cloned a male-sterility gene,ZmMs1,which encodes a tapetum-specific lateral organ boundary domain transcription factor,*** thatZmMs1/ZmLBD30 is initially turned on by a transcriptional activation cascade of ZmbHLH51-ZmMYB84-ZmMS7,and then it serves as a repressor to shut down this cascade via feedback repression to ensure timely tapetal degeneration and proper level of *** activation-feedback repression loop regulating male fertility is conserved in maize and sorghum,and similar regulatory mechanism may also exist in other flowering plants such as rice and ***,these findings reveal a novel regulatory mechanism of pollen exine development by which a long-sought master repressor of upstream activators prevents excessive exine formation.

关键词： ZmMs1/ZmLBD30 LBD transcription factor feedback repression exine male sterility maize

宽频带Fabry-Perot谐振器印刷天线

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

东南大学学报（自然科学版） 2007年第5期37卷 747-750页

作者：符道临章文勋刘震国东南大学毫米波国家重点实验室南京210096

分析了采用贴片式频率选择表面(FSS)为盖板、U形缝隙矩形贴片为辐射器的Fabry-Perot谐振器印刷天线,揭示了其天线频带远窄于辐射器频带的原因.鉴于上述Fabry-Perot谐振器天线的实用频带主要受限于谐振型的盖板,因此要展宽实用频带,就应... 详细信息

分析了采用贴片式频率选择表面(FSS)为盖板、U形缝隙矩形贴片为辐射器的Fabry-Perot谐振器印刷天线,揭示了其天线频带远窄于辐射器频带的原因.鉴于上述Fabry-Perot谐振器天线的实用频带主要受限于谐振型的盖板,因此要展宽实用频带,就应弱化盖板的谐振特性,所以提出将FSS中相同尺寸的方形贴片改进成沿一维或二维渐变尺寸的结构.同时应增宽阻抗频带和增益频带及其相互交叠的带域,即增宽可利用的公共频带.仿真结果显示这种改进增宽了此类天线兼顾高定向性和阻抗匹配的实用频带.

关键词： Fabry—Perot谐振器印刷天线宽频带天线频率选择表面

Development of mature seed-derived regeneration system in common wheat

在线全文

学校读者我要写书评

暂无评论

Development of mature seed-derived regeneration system in co...

博士生学术经历具体满意度与整体满意度的关系研究

中国遗传学会植物遗传和基因组学专业委员会2009年学术研讨会

作者： Shuyun Wang,Xin Hu,Bo Lv,and daolin fu~* The National Key Laboratory of Crop Biology,College of Agronomy,Shandong Agricultural University, Tai’an,Shandong,China

Of many plant species,a robust regeneration system is the foundation for genetic *** wheat(Triticum aestivum L.),the immature embryo-based regeneration systems have been developed in‘Bobwhite’,‘Jagger’ and some Ch... 详细信息

关键词： Callus mature seed regeneration Triticum aestivum

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

江苏高教 2020年第7期 49-55页

作者：许丹东傅道麟吕林海南京大学教育研究院南京210093

基于南京大学1286份博士生调查数据,采用回归分析探索博士生学术经历具体满意度与整体满意度的关系,结果发现,博士生的导师指导满意度和项目支持满意度对整体满意度的正向预测作用较大,课程教学满意度、科研氛围满意度和科研设施满意度... 详细信息

基于南京大学1286份博士生调查数据,采用回归分析探索博士生学术经历具体满意度与整体满意度的关系,结果发现,博士生的导师指导满意度和项目支持满意度对整体满意度的正向预测作用较大,课程教学满意度、科研氛围满意度和科研设施满意度的正向预测作用较小,基础设施满意度和奖助体系满意度没有显著预测作用。均值结果显示,博士生的导师指导满意度得分最高、奖助体系满意度得分最低,并且人文社科类博士生的满意度评价整体上高于理工科。结合均值得分和回归分析结果,项目支持满意度是对整体满意度具有较大影响且均值得分较低的满意度变量。基于上述发现讨论提高博士生培养质量的对策建议。

关键词：博士生满意度学术经历博士生教育导师指导项目支持