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Recent advances in core-shell organic framework-based photocatalysts for energy conversion and environmental remediation
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作者 Qibing Dong ximing li +9 位作者 Yanyan Duan Qingyun Tian Xinxin liang Yiyin Zhu lin Tian Junjun Wang Atif Sial Yongqian Cui Ke Zhao Chuanyi Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期168-199,I0004,共33页
Direct conversion of solar energy into chemical energy in an environmentally friendly manner is one of the most promising strategies to deal with the environmental pollution and energy crisis.Among a variety of materi... Direct conversion of solar energy into chemical energy in an environmentally friendly manner is one of the most promising strategies to deal with the environmental pollution and energy crisis.Among a variety of materials developed as photocatalysts,the core-shell metal/covalent-organic framework(MOF or COF)photocatalysts have garnered significant attention due to their highly porous structure and the adjustability in both structure and functionality.The existing reviews on core-shell organic framework photocatalytic materials have mainly focused on core-shell MOF materials.However,there is still a lack of indepth reviews specifically addressing the photocatalytic performance of core-shell COFs and MOFs@COFs.Simultaneously,there is an urgent need for a comprehensive review encompassing these three types of core-shell structures.Based on this,this review aims to provide a comprehensive understanding and useful guidelines for the exploration of suitable core-shell organic framework photocatalysts towards appropriate photocatalytic energy conversion and environmental governance.Firstly,the classification,synthesis,formation mechanisms,and reasonable regulation of core-shell organic framework were summarized.Then,the photocatalytic applications of these three kinds of core-shell structures in different areas,such as H_(2)evolution,CO_(2)reduction,and pollutants degradation are emphasized.Finally,the main challenges and development prospects of core-shell organic framework photocatalysts were introduced.This review aims to provide insights into the development of a novel generation of efficient and stable core-shell organic framework materials for energy conversion and environmental remediation. 展开更多
关键词 Organic framework Core-shell structure PHOTOCATALYSIS Energy conversion Environmental remediation
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Broadband intelligent programmable metasurface with polarization-modulated self-adaptive electromagnetic functionality switching
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作者 ximing li RUI XU +3 位作者 XIAOFENG SUN YUAN ZHAO ZHAO YANG GUOHONG DU 《Photonics Research》 SCIE EI CAS CSCD 2024年第7期1395-1409,共15页
Programmable metasurfaces have received a great deal of attention due to their ability to dynamically manipulate electromagnetic(EM) waves. Despite the rapid growth, most of the existing metasurfaces require manual co... Programmable metasurfaces have received a great deal of attention due to their ability to dynamically manipulate electromagnetic(EM) waves. Despite the rapid growth, most of the existing metasurfaces require manual control to switch among different functionalities, which poses severe limitations on practical applications. Here, we put forth an intelligent metasurface that has self-adaptive EM functionality switching in broadband without human participation. It is equipped with polarization discrimination antennas(PDAs) and feedback components to automatically adjust functionalities for the different incident polarization information. 展开更多
关键词 equipped ADJUST polarization
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Fullerene-Intercalated Graphitic Carbon Nitride as a HighPerformance Anode Material for Sodium-Ion Batteries 被引量:5
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作者 Pengju li Yanglin Shen +2 位作者 ximing li Wenhuan Huang Xing Lu 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2022年第2期608-616,共9页
Two-dimensional(2D)graphitic carbon nitride(g-CN)is a promising anode material for sodium-ion batteries(SIBs),but its insufficient interlayer spacing and poor electronic conductivity impede its sodium storage capacity... Two-dimensional(2D)graphitic carbon nitride(g-CN)is a promising anode material for sodium-ion batteries(SIBs),but its insufficient interlayer spacing and poor electronic conductivity impede its sodium storage capacity and cycling stability.Herein,we report the fabrication of a fullerene(C_(60))-modified graphitic carbon nitride(C_(60)@CN)material which as an anode material for SIBs shows a high-reversible capacity(430.5 mA h g^(−1) at 0.05 A g^(−1),about 3 times higher than that of pristine g-CN),excellent rate capability(226.6 mA h g^(−1) at 1 A g^(−1))and ultra-long cycle life(101.2 mA h g^(−1) after 5000 cycles at 5 A g^(−1)).Even at a high-active mass loading of 3.7 mg cm^(−2),a reversible capacity of 316.3 mA h g^(−1) can be obtained after 100 cycles.Such outstanding performance of C_(60)@CN is attributed to the C_(60) molecules distributed in the g-CN nanosheets,which enhance the electronic conductivity and prevent g-CN sheets from restacking,thus resulting in enlarged interlayer spacing and exposed edge N defects(pyridinic N and pyrrolic N)for sodium-ion storage.Furthermore,a sodium-ion full cell combining C60@CN anode and NVPF@rGO cathode provides high-coulombic efficiency(>96.5%),exceptionally high-energy density(359.8 W h kganode−1 at power density of 105.1 W kganode−1)and excellent cycling stability(89.2%capacity retention over 500 cycles at 1Aganode−1).This work brings new insights into the field of carbon-based anode materials for SIBs. 展开更多
关键词 energy storage FULLERENE interlayer distance nitrogen-doped carbon materials
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Right ventricular-arterial uncoupling as an independent prognostic factor in acute heart failure with preserved ejection fraction accompanied with coronary artery disease 被引量:3
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作者 Hongdan Jia li liu +2 位作者 Xile Bi ximing li Hongliang Cong 《Chinese Medical Journal》 SCIE CAS CSCD 2023年第10期1198-1206,共9页
Background:Right ventricular(RV)-arterial uncoupling is a powerful independent predictor of prognosis in heart failure with preserved ejection fraction(HFpEF).Coronary artery disease(CAD)can contribute to the pathophy... Background:Right ventricular(RV)-arterial uncoupling is a powerful independent predictor of prognosis in heart failure with preserved ejection fraction(HFpEF).Coronary artery disease(CAD)can contribute to the pathophysiological characteristics of HFpEF.This study aimed to evaluate the prognostic value of RV-arterial uncoupling in acute HFpEF patients with CAD.Methods:This prospective study included 250 consecutive acute HFpEF patients with CAD.Patients were divided into RV-arterial uncoupling and coupling groups by the optimal cutoff value,based on a receiver operating characteristic curve of tricuspid annular plane systolic excursion to pulmonary artery systolic pressure(TAPSE/PASP).The primary endpoint was a composite of all-cause death,recurrent ischemic events,and HF hospitalizations.Results:TAPSE/PASP≤0.43 provided good accuracy in identifying patients with RV-arterial uncoupling(area under the curve,0.731;sensitivity,61.4%;and specificity,76.6%).Of the 250 patients,150 and 100 patients could be grouped into the RV-arterial coupling(TAPSE/PASP>0.43)and uncoupling(TAPSE/PASP≤0.43)groups,respectively.Revascularization strategies were slightly different between groups;the RV-arterial uncoupling group had a lower rate of complete revascularization(37.0%[37/100]vs.52.7%[79/150],P<0.001)and a higher rate of no revascularization(18.0%[18/100]vs.4.7%[7/150],P<0.001)compared to the RV-arterial coupling group.The cohort with TAPSE/PASP≤0.43 had a significantly worse prognosis than the cohort with TAPSE/PASP>0.43.Multivariate Cox analysis showed TAPSE/PASP≤0.43 as an independent associated factor for the primary endpoint,all-cause death,and recurrent HF hospitalization(hazard ratios[HR]:2.21,95%confidence interval[CI]:1.44-3.39,P<0.001;HR:3.32,95%CI:1.30-8.47,P=0.012;and HR:1.93,95%CI:1.10-3.37,P=0.021,respectively),but not for recurrent ischemic events(HR:1.48,95%CI:0.75-2.90,P=0.257).Conclusion:RV-arterial uncoupling,based on TAPSE/PASP,is independently associated with adverse outcomes in acute HFpEF patients with CAD. 展开更多
关键词 Heart failure with preserved ejection fraction Coronary artery disease Right ventricular-arterial coupling Prognosis REVASCULARIZATION
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ComRank: Joint Weight Technique for the Identification of Influential Communities 被引量:1
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作者 Muhammad Azam Zia Zhongbao Zhang +2 位作者 ximing li Haseeb Ahmad Sen Su 《China Communications》 SCIE CSCD 2017年第4期101-110,共10页
Recently, the community analysis has seen enormous research advancements in the field of social networks. A large amount of the current studies put forward different models and algorithms about most influential people... Recently, the community analysis has seen enormous research advancements in the field of social networks. A large amount of the current studies put forward different models and algorithms about most influential people. However, there is little work to shed light on how to rank communities while considering their levels that are determined by the quality of their published contents. In this paper, we propose solution for measuring the influence of communities and ranking them by considering joint weight composed of internal and external influence of communities. To address this issue, we design a novel algorithm called Com Rank: a modification of Page Rank, which considers the joint weight in order to identify impact of each community and ranking them. We use real-world data trace in citation network and perform extensive experiments to evaluate our proposed algorithm. The comparative results depict significant improvements by our algorithm in community ranking due to the inclusion of proposed weighting feature. 展开更多
关键词 online social networks community rank citation network Page Rank influence
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Safety Evaluation Method of Evacuation Routes in Areas in Case of Earthquake Disasters Using Ant Optimization Algorithm and Geographic Information Systems
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作者 Kayoko Yamamoto ximing li 《Journal of Environmental Science and Engineering(A)》 2017年第9期462-478,共17页
The present study aims to propose the method for the quantitative evaluation of safety concerning evacuation routes in case of earthquake disasters in urban areas using ACO (Ant Colony Optimization) algorithm and G... The present study aims to propose the method for the quantitative evaluation of safety concerning evacuation routes in case of earthquake disasters in urban areas using ACO (Ant Colony Optimization) algorithm and GIS (Geographic Information Systems). Regarding the safety evaluation method, firstly, the similarity in safety was focused on while taking into consideration road blockage probability, and after classifying roads by means of the hierarchical cluster analysis, the congestion rates of evacuation routes using ACO simulations were estimated. Based on these results, the multiple evacuation routes extracted were visualized on digital maps by means of GIS, and its safety was evaluated. Furthermore, the selection of safe evacuation routes between evacuation sites, for cases when the possibility of large-scale evacuation after an earthquake disaster is high, is made possible. As the safety evaluation method is based on public information, by obtaining the same geographic information as the present study, it is effective in other areas regardless of whether the information is of the past and future. Therefore, in addition to spatial reproducibility, the safety evaluation method also has high temporal reproducibility. Because safety evaluations are conducted on evacuation routes based on quantified data, highly safe evacuation routes that are selected have been quantitatively evaluated, and thus serve as an effective indicator when selecting evacuation routes. 展开更多
关键词 Large-scale evacuation evacuation route safety evaluation earthquake disaster ACO (Ant Colony Optimization) GIS (Geographic Information Systems).
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Secure, Efficient and Searchable File System on Distributed Clouds
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作者 ximing li Weizhao Chen +2 位作者 Yubin Guo Sha Ma Qiong Huang 《国际计算机前沿大会会议论文集》 2019年第2期263-266,共4页
Many enterprises and personals are inclining to outsource their data to public clouds, but security and privacy are two critical problems cannot be ignored. The door of cloud provider may be broken, and the data may a... Many enterprises and personals are inclining to outsource their data to public clouds, but security and privacy are two critical problems cannot be ignored. The door of cloud provider may be broken, and the data may also be dug into by providers to find valuable information. In this paper, a secure and efficient storage file (SES FS) system is proposed to distribute files in several clouds and allows users to search the files securely and efficiently. In the proposed system, keywords were transformed into integers and secretly shared in a defined finite field, then the shares were mapped to random numbers in specified random domain in each cloud. Files were encrypted with distinct secret key and scattered within different clouds. Information about keyword/file was secretly shared among cloud providers. Legal users can search in the clouds to find correct encrypted files and reconstruct corresponding secret key. No adversary can find or detect the real file information even they can collude all the servers. Manipulation on shares by one or more clouds can be detected with high probability. The system can also detect malicious servers through introduced virtual points. One interesting property for the scheme is that new keywords can be added easily, which is difficult and usually not efficient for many searchable symmetric encryption systems. Detailed experimental result shows, with tolerable uploading delay, the scheme exhibits excellent performance on data retrieving aspect. 展开更多
关键词 SECRET sharing SECURE searchable FILE system DISTRIBUTED CLOUDS
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Investigation of stress distribution and damage behavior caused by forced installation of a composite bolted joint with a hole-location error
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作者 Chinan liU Yuan li +5 位作者 Yi CHENG An’an ZHAO Kunpeng DU Yue SHI ximing li Hui CHENG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第1期201-217,共17页
In this paper,the influence of forced installation caused by a hole-location error on the 3D stress distribution and damage of a composite bolted joint is investigated.An analytical model of stress distributed on comp... In this paper,the influence of forced installation caused by a hole-location error on the 3D stress distribution and damage of a composite bolted joint is investigated.An analytical model of stress distributed on composite holes is promoted,in view of non-uniform extrusion caused by forced installation.At first,non-uniform extrusion of the hole edge caused by forced installation is analyzed.According to the contact state,expression of hole deformation is given.Then,based on Hertz theory,the maximum extrusion load is obtained with help of deformation expression.By constructing an elastic foundation beam model,3D stress distributed on a hole could be analyzed according to the extrusion load.Then,stress distribution predicted by the above analytical method is compared with that provided by FE considering composite damage.Finally,a forced installation experiment is carried out to analyze the damage distribution of the joint.Results show that a central-symmetrically distributed stress is introduced by the hole-location error.With an increment of the error,strength of composite decreases due to extrusion damage.Therefore,stress presents a concave distribution on the hole.As the hole-location error exceeding 3%,stress decreases gradually due to failure of composite.Damage of holes does not exhibit a centrosymmetric distribution.Serious damage is mainly distributed on the entrance of the hole at the lower sheet. 展开更多
关键词 Hole-location error Composite joint Forced installation Stress distribution DAMAGE
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Quantitative Trait Loci for Panicle Layer Uniformity Identified in Doubled Haploid Lines of Rice in Two Environments 被引量:7
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作者 liangyong Ma Jinsong Bao +6 位作者 Longbiao Guo Dali Zeng ximing li Zhijuan Ji Yingwu Xia Changdeng Yang Qian Qian 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2009年第9期818-824,共7页
Uniformity of stem height in rice directly affects crop yield potential and appearance, and has become a vital index for rice improvement. In the present study, a doubled haploid (DH) population, derived from a cros... Uniformity of stem height in rice directly affects crop yield potential and appearance, and has become a vital index for rice improvement. In the present study, a doubled haploid (DH) population, derived from a cross between japonica rice Chunjiang 06 and indica rice TN1 was used to analyze the quantitative trait locus (QTL) for three related traits of paniclelayer-uniformity; that is, the tallest panicle height, the lowest panicle height and panicle layer disuniforrnity in two locations:Hangzhou (HZ) and Hainan (HN). A total of 16 QTLs for three traits distributed on eight chromosomes were detected in two different environments. Two QTLs, qTPH-4 and qTPH-8 were co-located with the QTLs for qLPH-4 and qLPH-8, which were only significant in the HZ environment, whereas the qTPH-6 and qLPH-6 located at the same interval were only significant in the HN environment. Two QTLs, qPLD-10.1 and qPLD-10.2, were closely linked to qTPH-10, and they might have been at the same locus. One QTL, qPLD-3, was detected in both environments, explaining more than 23% of the phenotypic variations. The CJ06 allele of qPLD-3 could increase the panicle layer disuniformity by 9.23 and 4.74 cm in the HZ and HN environments. Except for qPLD-3, almost all other QTLs for the same trait were detected only in one environment, indicating that these three traits were dramatically affected by environmental factors. The results may be useful for elucidation of the molecular mechanism of panicle-layer-uniformity and marker assisted breeding for super-rice. 展开更多
关键词 double haploid population panicle layer uniformity plant height quantitative trait loci rice.
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High-resolution flexible electronic devices by electrohydrodynamic jet printing:From materials toward applications 被引量:4
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作者 Xinran Zheng Mingshuang Hu +4 位作者 Yixuan liu Jun Zhang Xiangxiang li ximing li Hui Yang 《Science China Materials》 SCIE EI CAS CSCD 2022年第8期2089-2109,共21页
High-resolution flexible electronic devices are widely used in the fields of soft robotics,smart human-machine interaction,and intelligent e-healthcare monitoring due to their mechanical flexibility,ductility,and comp... High-resolution flexible electronic devices are widely used in the fields of soft robotics,smart human-machine interaction,and intelligent e-healthcare monitoring due to their mechanical flexibility,ductility,and compactness.The electrohydrodynamic jet printing(e-jet printing)technique is used for constructing high-resolution and cross-scale flexible electronic devices such as field-effect transistors(FETs),flexible sensors,and flexible displays.As a result,researchers are paying close attention to e-jet printing flexible electronic devices.In this review,we focused on the latest advancements in high-resolution flexible electronics made by e-jet printing technology,including various materials used in e-jet printing inks,the process control of e-jet printing,and their applications.First,we summarized various functional ink materials available for e-jet printing,including organic,inorganic,and hybrid materials.Then,the interface controlling the progress of e-jet printing was discussed in detail,including the physical and chemical properties of the functional ink,the interfacial wettability between the ink and substrate,and the microdroplet injection behavior in a high-voltage field.Additionally,various applications of e-jet printing in the fields of flexible electrodes,FETs,flexible sensors,and flexible displays were demonstrated.Finally,the future problems and potential associated with the development of next generation e-jet printing technology for flexible electronic devices were also presented. 展开更多
关键词 electrohydrodynamic jet printing flexible electronic devices HIGH-RESOLUTION
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基于颗粒动力学理论的搅拌器中固液流动的数值模拟 被引量:8
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作者 李希铭 牛胜利 +3 位作者 曲同鑫 韩奎华 路春美 王永征 《过程工程学报》 CAS CSCD 北大核心 2020年第3期265-275,共11页
在欧拉双流体模型基础上引入颗粒动力学理论(KTGF),对带挡板圆盘涡桨式搅拌器内的固液两相流动进行数值模拟。结果表明,搅拌器底部颗粒温度分布与固相浓度分布趋势吻合,转速低于600 r/min时,槽底会形成明显的颗粒沉积,转速从600 r/min增... 在欧拉双流体模型基础上引入颗粒动力学理论(KTGF),对带挡板圆盘涡桨式搅拌器内的固液两相流动进行数值模拟。结果表明,搅拌器底部颗粒温度分布与固相浓度分布趋势吻合,转速低于600 r/min时,槽底会形成明显的颗粒沉积,转速从600 r/min增至1 500 r/min,堆积区向轴中心收缩,基于颗粒动力学理论可以合理解释挡板及叶轮转速对固相浓度分布的影响。随叶轮转速增大,搅拌器内固液两相湍流运动加剧,颗粒温度、湍动能及轴向速度增加,颗粒分布更均匀,但达到完全悬浮状态后颗粒温度趋于稳定。搅拌器底部和挡板处颗粒堆积导致了局部颗粒浓度增加及颗粒平均自由行程减少,颗粒温度反而降低;同时挡板布置使搅拌器内形成了双循环回路,加强了流体的湍流程度,增强了湍动能,但导致颗粒在挡板处积聚,不利于固相在挡板处均匀分布。 展开更多
关键词 搅拌容器 双流体模型 两相流 颗粒动力学理论 湍流
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Mapping QTLs for heading synchrony in a doubled haploid population of rice in two environments 被引量:2
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作者 liangyong Ma Changdeng Yang +6 位作者 Dali Zeng Jing Cai ximing li Zhijuan Ji Yingwu Xia Qian Qian Jinsong Bao 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2009年第5期297-304,共8页
Simultaneous heading of plants within the same rice variety, also refer to heading synchrony, is an important factor that affects simultaneous ripening of the variety. Understanding of the genetic basis of heading syn... Simultaneous heading of plants within the same rice variety, also refer to heading synchrony, is an important factor that affects simultaneous ripening of the variety. Understanding of the genetic basis of heading synchrony may contribute to molecular breeding of rice with simultaneous heading and ripening. In the present study, a doubled haploid (DH) population, derived from a cross between Chunjiang 06 and TN1 was used to analyze quantitative trait locus (QTL) for heading synchrony related traits, i.e., early heading date (EHD), late heading date (LHD), heading asynchrony (HAS), and tiller number (PN). A total of 19 QTLs for four traits distributed on nine chromosomes were detected in two environments. One QTL, qHAS-8 for HAS, explained 27.7% of the phenotypic variation, co-located with the QTLs for EHD and LHD, but it was only significant under long-day conditions in Hangzhou, China. The other three QTLs, qHAS-6, qHAS-9, and qHAS-10, were identified under short-day conditions in Hainan, China, each of which explained about 11% of the phenotypic variation. Two of them, qHAS-6 and qHAS-9, were co-located with the QTLs for EHD and LHD. Two QTLs, qPN-4 and qPN-5 for PN, were detected in Hangzhou, and qPN-5 was also detected in Hainan. However, none of them was co-located with QTLs for EHD, LHD, and HAS, suggesting that PN and HAS were controlled by different genetic factors. The results of this study can be useful in marker assisted breeding for improvement of heading synchrony. 展开更多
关键词 RICE doubled haploid population heading synchrony quantitative trait loci (QTL)
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A backbone parent contributes core genomic architecture to pedigree breeding of early-season indica rice 被引量:1
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作者 Junyu Chen Huali Zhang +9 位作者 Shuhan Deng Huilong Du Zhuo Chen Yuhui Zhao Dongqing Dai Chengzhen liang ximing li Chengzhi liang Rui Zhang liangyong Ma 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2021年第11期1040-1043,共4页
Due to the capacity to deliver favorable target traits to offspring via breeder selection,backbone parents carrying accumulated favorable agronomic traits have been used widely in breeding programs in crop species,suc... Due to the capacity to deliver favorable target traits to offspring via breeder selection,backbone parents carrying accumulated favorable agronomic traits have been used widely in breeding programs in crop species,such as rice,wheat,cotton,and maize(Zhou et al.,2016;Fradgley et al.,2019;Li et al.,2019;Ma et al.,2019;Han et al.,2020).It is estimated that 3656(~70%)of the major Chinese rice varieties released from the year 1950e2008 were found to be derived from as few as 35 backbone parents(Tang et al.,2012).Large-scale genome sequencing of diverse rice accessions has been emerged as a promising technology for the identification of key genomic regions or loci under selection during rice domestication(Huang et al.,2012;Wang et al.,2018)and genetic improvement(Xie et al.,2015).On the other hand,sequence information derived from breeding pedigrees could also help to unravel how favorable genomic regions were transmitted from parents to their offspring,as demonstrated by the researches on the pedigrees of the wellknown rice varieties Minghui 63 and Huanghuazhan(Zhou et al.,2016;Chen et al.,2017;Huang et al.,2018).These researches enhanced the understanding of the cumulative effects of beneficial alleles at limited loci in selected offspring varieties.A few examples include IPA1,Gn1a,GW5,GS3,and GS5 for high grain yield,Waxy for good grain eating quality,and Xa21 for high adversity adaptability. 展开更多
关键词 BREEDING BACKBONE SEASON
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Manipulating electromagnetic radiation of one-way edge states by magnetic plasmonic gradient metasurfaces
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作者 Huabing Wu Xiang Xi +3 位作者 ximing li Yin Poo Shiyang liu Rui-Xin Wu 《Photonics Research》 SCIE EI CAS CSCD 2022年第2期610-617,共8页
We theoretically and experimentally demonstrate that magnetic plasmonic gradient metasurfaces(GMSs) can convert a spatially propagating wave to a one-way edge state or vice versa with high efficiency. Consisting of an... We theoretically and experimentally demonstrate that magnetic plasmonic gradient metasurfaces(GMSs) can convert a spatially propagating wave to a one-way edge state or vice versa with high efficiency. Consisting of an array of ferrite rods with a rotation gradient introduced to the rod dimers in the unit cell, GMSs can covert an incident wave beam to a one-way edge state with efficiency over 77%, and almost fully radiate into free space from the one-way edge state. The phenomenon arises from the unidirectional coupling of the spatial electromagnetic wave with magnetic plasmonic GMSs, which is evidenced from the photonic band diagrams of the edge state.The one-way edge state can radiate to or be excited from air with different angles by either engineering the gradient of the GMSs or tuning the bias magnetic field. By designing magnetic plasmonic GMSs with more exquisite configurations, we can expect many more nonreciprocal properties, adding additional freedom in manipulating electromagnetic waves. 展开更多
关键词 GRADIENT MAGNETIC UNIDIRECTIONAL
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