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Exploring charge and spin fluctuations in infinite-layer cuprate SrCuO_(2)from a phonon perspective

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 159-167页

作者： Xin Du Pei-Han Sun ben-Chao Gong Jian-Feng Zhang Zhong-Yi Lu Kai Liu Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Department of Physics School of ScienceJiangsu University of Science and TechnologyZhenjiang 212100China Institute of Physics Chinese Academy of SciencesBeijing 100190China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China

The infinite-layer cuprate ACu O_(2)(A=Ca,Sr,Ba)possesses the simplest crystal structure among numerous cuprate superconductors and can serve as a prototypical system to explore the unconventional *** on the first-principles electronic structure calculations,we have studied the electronic and magnetic properties of the infinite-layer cuprate SrCuO_(2)from a phonon *** find that interesting fluctuations of charges,electrical dipoles,and local magnetic moments can be induced by the atomic displacements of phonon modes in SrCuO_(2)upon the hole *** all optical phonon modes of SrCuO_(2)in the antiferromagnetic Néel state,only the A_(1g)mode that involves the full-breathing O vibrations along the Cu-O bonds can cause significant fluctuations of local magnetic moments on O atoms and dramatic charge redistributions between Cu and O ***,due to the atomic displacements of the A_(1g)mode,both the charge fluctuations on Cu and the electrical dipoles on O show a dome-like evolution with increasing hole doping,quite similar to the experimentally observed behavior of the superconducting T_(c);in comparison,the fluctuations of local magnetic moments on O display a monotonic enhancement along with the hole *** analyses indicate that around the optimal doping,there exists a large softening in the frequency of the A_(1g)phonon mode and a van Hove singularity in the electronic structure close to the Fermi level,suggesting potential electron-phonon *** work reveals the important role of the full-breathing O phonon mode playing in the infinite-layer SrCuO_(2),which may provide new insights in understanding the cuprate superconductivity.

关键词： first-principles calculations cuprate superconductors phonon charge and spin fluctuations

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首尔双子星

现代装饰 2024年第3期 184-187页

作者： ben van Berkel(设计) Gerard Loozekoot with Harlen Miller(设计) Crystal Tang and Ines Verna(设计) 不详

近期,UNStudio与奥雅纳和当地的Heerim建筑事务所联手,为新的和平公园摩天轮设计了一个愿景方案,这是首尔市政府为首尔上岩世界杯公园发起的一个地标项目。UNStudio的设计在初赛中脱颖而出,被选定与首尔住房社区公司合作,向首尔市提交... 详细信息

近期,UNStudio与奥雅纳和当地的Heerim建筑事务所联手,为新的和平公园摩天轮设计了一个愿景方案,这是首尔市政府为首尔上岩世界杯公园发起的一个地标项目。UNStudio的设计在初赛中脱颖而出,被选定与首尔住房社区公司合作,向首尔市提交设计方案。首尔市政府最近公布了UNStudio的设计方案,并暂时将其命名为“首尔双子星”。该项目是首尔市长提出的“汉江千般日落”愿景的一部分,旨在打造汉江沿岸的一千个景点,作为首尔市民的公共空间。

关键词：建筑事务所公共空间双子星摩天轮首尔市世界杯设计方案

液晶分子优化给体材料组装制备高性能有机太阳能电池

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高分子学报 2024年第6期55卷 698-708页

作者：曾光张奔李耀文苏州大学苏州市新型半导体光电材料与器件重点实验室苏州215123

活性层形貌优化是实现高效、稳定的体异质结有机太阳能电池(OSC)的关键,添加剂工程被广泛用于优化OSC活性层的膜形貌.基于此,本文工作提出了一种利用具有简单结构的液晶分子4-氰基-4'-庚基联苯(7-CB)作为添加剂优化给体聚合物(PM6)在共... 详细信息

活性层形貌优化是实现高效、稳定的体异质结有机太阳能电池(OSC)的关键,添加剂工程被广泛用于优化OSC活性层的膜形貌.基于此,本文工作提出了一种利用具有简单结构的液晶分子4-氰基-4'-庚基联苯(7-CB)作为添加剂优化给体聚合物(PM6)在共混膜中聚集行为的策略.通过掠入射广角X射线散射、原位吸收光谱及分子动力学模拟等表征发现,7-CB通过与PM6的烷基侧链之间的范德华力和CH/π相互作用诱导PM6规整排列,增强了PM6之间的相互作用,提高了活性层薄膜的结晶度.得益于此,无任何后处理的活性层薄膜中电荷传输得到改善,电荷重组被大幅抑制.基于7-CB处理的PM6:L8-BO制备的硬质和柔性二元OSCs效率分别从15.41%和14.90%提高到18.01%和17.26%.

关键词：有机太阳能电池添加剂自组装

Sand production:A smart control framework for risk mitigation

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Petroleum 2020年第1期6卷 1-13页

作者： Hisham ben Mahmud van Hong Leong Yuli Lestariono Department of Petroleum Engineering Curtin MalaysiaMalaysia Petronas Carigali Sdn Bhd PO BOX 1452MiriMalaysia

Due to the current global oil price,the sand production is considered undesirable product and the control of sand production is considered as one of the main concerns of production *** can damage downhole,subsea equipments and surface production facilities,also increasing the risk of catastrophic *** a result of that it costs the producers multiple millions of dollars each ***,there are many different approaches of sand control designed for different reservoir *** an appropriate technique for preventing formation sand production depends on different reservoir ***,choosing the best sand control method is the result of systematic *** this paper the sand production factors and their effects are presented where the emphasis is given towards the sand prediction to determine the probability of producing sand from the reservoir,followed by the correct prevention implementation of sand control *** combination of these two is presented as a smart control framework that can be applied for sand production management.

关键词： Sand production Sand control tools Sand management A smart control framework

Quantitative resistance against Bemisia tabaci in Solanum pennellii:Genetics and metabolomics

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Journal of Integrative Plant Biology 2016年第4期58卷 397-412页

作者： Floor van den Oever-van den Elsen Alejandro F.Lucatti Sjaak van Heusden Colette Broekgaarden Roland Mumm Marcel Dicke ben Vosman Wageningen UR Plant Breeding Wageningen University and Research CentreP.O.Box 3866700AJWageningenThe Netherlands Laboratory of Entomology Wageningen University and Research CentreP.O.Box 166700AAWageningenThe Netherlands Graduate School Experimental Plant Sciences Droevendaalsesteeg 16708 PB WageningenThe Netherlands Plant Research International Business Unit BioscienceWageningen University and Research CentreP.O.Box 166700AA WageningenThe Netherlands

The whitefly Bemisia tabaci is a serious threat in tomato cultivation worldwide as all varieties grown today are highly susceptible to this devastating herbivorous *** accessions of the tomato wild relative Solanum pennellii show a high resistance towards B. tabaci. A mapping approach was used to elucidate the genetic background of whiteflyresistance related traits and associated biochemical traits in this species. Minor quantitative trait loci（QTLs） for whitefly adult survival（AS） and oviposition rate（OR） were identified and some were confirmed in an F2BC1 population, where they showed increased percentages of explained variance（more than 30%）. Bulked segregant analyses on pools of whiteflyresistant and-susceptible F2 plants enabled the identification of metabolites that correlate either with resistance or susceptibility. Genetic mapping of these metabolites showed that a large number of them co-localize with whiteflyresistance QTLs. Some of these whitefly-resistance QTLs are hotspots for metabolite QTLs. Although a large number of metabolite QTLs correlated to whitefly resistance or susceptibility, most of them are yet unknown compounds and further studies are needed to identify the metabolic pathways and genes involved. The results indicate a direct genetic correlation between biochemical-based resistance characteristics and reduced whitefly incidence in S. pennellii.

关键词： Genetic linkage map life-history metabolic fingerprinting parameters tomato whitefly

In-situ formation of Ti-Mo biomaterials by selective laser melting of Ti/Mo and Ti/Mo_(2)C powder mixtures:A comparative study on microstructure,mechanical and wear performance,and thermal mechanisms

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Journal of Materials Science & Technology 2022年第20期115卷 81-96页

作者： Qimin Shi Shoufeng Yang Yi Sun Yifei Gu ben Mercelis Shengping Zhong Bart van Meerbeek Constantinus Politis KU Leuven Department of Biomedical SciencesOMFS-IMPATH Research Group&UZ Leuven(University Hospitals Leuven)Oral and Maxillofacial SurgeryKapucijnenvoer 33Leuven 3000Belgium University of Southampton Faculty of Engineering and Physical SciencesSouthampton SO171BJUnited Kingdom KU Leuven Department of Oral Health SciencesBIOMAT-Biomaterials Research Group&UZ Leuven(University Hospitals Leuven)DentistryKapucijnenvoer 7Leuven 3000Belgium

Ti-Mo alloys/composites are expected to be the next-generation implant material with low moduli but without toxic/allergic ***,synthesis mechanisms of the Ti-Mo biomaterials in Selective Laser Melting(SLM)vary according to raw materials and fundamentally influence material performance,due to inhomogeneous chemical compositions and ***,this work provides a comparative study on microstructure,mechanical and wear performance,and underlying thermal mechanisms of two promising Ti-Mo biomaterials prepared by SLM but through different synthesis mechanisms to offer scientific understanding for creation of ideal metal *** are(i)Ti-7.5 Mo alloys,prepared from a conventional Ti/Mo powder mixture,and(ii)Ti-7.5 Mo-2.4 Ti C composites,in-situ prepared from Ti/Mo_(2)C powder *** reveal that the in-situ Ti-7.5 Mo-2.4 Ti C composites made from Ti/Mo_(2)C powder mixture by SLM can produce 61.4%moreβphase and extra Ti C precipitates(diameter below 229.6 nm)than the Ti-7.5 Mo *** fine Ti C not only contributes to thinner and shorterβcolumnar grains under a large temperature gradient of 51.2 K/μm but also benefits material *** in-situ Ti-7.5 Mo-2.4 Ti C composites produce higher yield strength(980.1±29.8 MPa)and ultimate compressive strength(1561.4±39 MPa)than the Ti-7.5 Mo alloys,increasing by up to 12.1%.However,the fine Ti C with an aspect ratio of 2.71 dominates an unfavourable rise of elastic modulus to 91.9±2 GPa,44.7%higher than the Ti-7.5 Mo alloys,which,nevertheless,is still lower than the modulus of traditional Ti-6 Al-4 ***,Ti C and its homogeneous distribution benefit wear resistance,decreasing the wear rate of the in-situ Ti-7.5 Mo-2.4 Ti C composites to 6.98×10^(-4)mm^3 N^(-1)m^(-1),which is 36%lower than that of the Ti-7.5 Mo ***,although with higher modulus than the Ti-7.5 Mo alloys,the SLM-fabricated in-situ Ti-7.5 Mo-2.4 Ti C composites can expect to provide good biomedical applicati

关键词： Selective laser melting(SLM) Titanium Metal matrix composites Microstructures Mechanical properties Wear properties

Significance of differential allelic expression in phenotypic plasticity and evolutionary potential of microbial eukaryotes

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Quantitative Biology 2021年第4期9卷 400-410页

作者： ben P.Tatman Thomas Mock Taoyang Wu Cock van Oosterhout School of Environmental Sciences University of East AngliaNorwich Research ParkNorwichNorfolkNR47TJUK Department of Physics University of WarwickCoventryCV47ALUK School of Computer Sciences University of East AngliaNorwich Research ParkNorwichNorfolkNR47TJUK

Background:Differential allelic expression(DAE)plays a key role in the regularion of many biological processes,and it may also play a role in adaptive ***,environment-dependent DAE has been observed in species of marine phytoplankton,and most remarkably,alleles that showed the highest level of DAE also showed the fastest rate of ***:To better understand the role of DAE in adaptive evolution and phenotypic plasticity,we developed a 2-D cellular automata model“DAEsy-World”that builds on the classical Daisyworld ***:Simulations show that DAE delineates the evolution of alternative alleles of a gene,enabling the two alleles to adapt to different environmental conditions and *** DAE,the build-up of genetic polymorphisms within genes is driven by positive selection rather than strict neutral evolution,and this can enhance phenotypic ***,in sexually reproducing organisms,DAE also increased the standing genetic variation,augmenting a species’adaptive evolutionary potential and ability to respond to fluctuating and/or changing conditions(cf,genetic assimilation).We furthermore show that DAE is likely to evolve in fluctuating environmental ***:DAE increases the adaptive evolutionary potential of both sexual and asexually reproducing organisms,and it may affect the pattern of nucleotide substitutions of genes.

关键词： differential allelic expression daisyworld model adaptive evolution phenotypic plasticity

The ability to manipulate ROS metabolism in pepper may affect aphid virulence

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Horticulture Research 2020年第1期7卷 2720-2732页

作者： Mengjing Sun Roeland E.Voorrips Martijn van Kaauwen Richard G.FVisser ben Vosman Plant Breeding Wageningen University&ResearchP.O.Box 3866700 AJ WageningenNetherlands

Myzus persicae has severe economic impact on pepper(Capsicum)***,we identified two populations of ***,NL and SW,that were avirulent and virulent,respectively on *** accession *** transcriptomics approach used in the current study,which is the first study to explore the pepper−aphid interaction at the whole genome gene expression level,revealed genes whose expression is differentially regulated in pepper accession PB2013071 upon infestation with these *** *** NL population induced ROS production genes,while the SW population induced ROS scavenging genes and repressed ROS production *** also found that the SW population can induce the removal of ROS which accumulated in response to preinfestion with the NL population,and that preinfestation with the SW population significantly improved the performance of the NL *** paper supports the hypothesis that *** can overcome the resistance in accession PB2013071 probably because of its ability to manipulate plant defense response especially the ROS metabolism and such ability may benefit avirulent conspecific aphids.

关键词： metabolism pepper overcome

The Bemisia tabaci species complex： Additions from different parts of the world

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Insect Science 2013年第6期20卷 723-733页

作者： Syarifin Firdaus ben Vosman Nurul Hidayati Ence Darmo Jaya Supena Richard G.F. Visser Adriaan Willem van Heusden Research .Center for Bioresources and Biotechnology Bogor Agricultural University Bogor PT East West Seed Indonesia (EWlNDO) Purwakarta West Java Indonesia Wageningen UR Plant Breeding Wageningen UR Droevendaalsesteeg 1 Wageningen the Netherlands Graduate School Experimental Plant Sciences Wageningen UR Droevendaalsesteeg 1 Wageningen the Netherlands

Bemisia tabaci is one of the most threatening pests in many crops. We sequenced part of the mitochondrial cytochrome oxidase I gene from fifty whitefly populations collected in Indonesia, Thailand, India and China. Nineteen unique sequences （haplotypes） of the cytochrome oxidase I were identified in these populations. They were combined with sequences available in databases, resulting in a total of 407 haplotypes and analyzed together with nine outgroup accessions. A phylogenetic tree was calculated using the maximum likelihood method. The tree showed that all groups that were found in previous studies were also present in our study. Additionally, seven new groups were identified based on the new haplotypes. Most B. tabaci haplotypes grouped based on their geographical origin. Two groups were found to have a worldwide distribution. Our results indicate that our knowledge on the species complex around B. tabaci is still far from complete.

关键词： dendrogram haplotype mtCOI species complex whitefly