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Room-temperature ferrimagnetism and size-modulated electronic structures in two-dimensional cluster-based metal-organic frameworks

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Science China Chemistry 2024年第4期67卷 1334-1340页

作者： Jing Cheng xingxing li Jinlong Yang Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of ChinaHefei 230026China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Cluster-assembled materials have attracted particular attention for their complex hierarchical structures and unique ***,the majority of cluster-based assemblies developed so far are either non-magnetic or only exhibit magnetic ordering with a relatively low Curie temperature,limiting their applications in ***,two-dimensional(2D)cluster-assembled materials with room-temperature magnetism remain highly *** this purpose,based on first principles calculations,we design a series of thermodynamically stable 2D cluster-based metal-organic frameworks(MOFs)Fe_(n)-(pyz)(n=1-6)by utilizing Fenmetal clusters as nodes and nitrogen-containing pyrazine ligands as organic *** 2D cluster-based MOFs exhibit robust ferrimagnetic ordering due to the strong d-p direct exchange interaction between d-electron spin of Fe_(n)(n=1-6)clusters and charge transfer-induced p-electron spin of pyrazine *** particular,the ferrimagnetic Curie temperatures are well above room temperature(up to 836 K).Additionally,altering the size of Fe_(n)clusters in Fe_(n)-(pyz)(n=1-6)MOFs results in diverse functional spintronic properties,including bipolar magnetic semiconductors,half semiconductors and Dirac half ***,these 2D assembled MOFs possess sizable magnetic anisotropy energies,up to 9.16 me V per formula.

关键词： metal-organic framework two-dimensional material half metal bipolar magnetic semiconductor magnet

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Determination of global geodetic parameters using satellite laser ranging to Galileo,GLONASS,and BeiDou satellites

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Satellite Navigation 2024年第1期5卷 240-257页

作者： xingxing li Jiaqing Lou Yongqiang Yuan Jiaqi Wu Keke Zhang School of Geodesy and Geomatics Wuhan University129 Luoyu RoadWuhan430079HubeiChina

The new Global Navigation Satellite System(GNSS)satellites,including GLONASS,Galileo,and BeiDou system,are equipped with Laser Retroreflector Arrays(LRA)to support Satellite Laser Ranging(SLR)tracking,which contributes to the estimation of global geodetic *** this study,we estimate the global geodetic parameters using the SLR observations to GNSS satellites and also investigate the effects of different data processing strategies on the estimated Earth Rotation Parameters(ERP),geocenter motion,and terrestrial *** results indicate that setting range bias parameters for each satellite-station pair can effectively account for the satellite-specific biases induced by LRAs,leading to smaller Root Mean Square Errors(RMSE)of the post-fit SLR ***,estimating the range biases for each satellite-station pair improves the accuracy of the estimated station coordinates and *** also examine the impact of different arc lengths on the estimates of ERP,geocenter motion,and terrestrial *** results show that extending arc length can significantly reduce the formal error of *** 7-day strategy produces the smallest RMSEs of 473 microarcseconds and 495 microarcseconds for the estimated X-and Y-component of pole coordinates,and 52 microseconds for length-of-day,***,the estimated geocenter motion is less affected by the arc length,even the shortest 1-day arc strategy can capture the seasonal variations of geocenter motion in Z *** scale estimation,extending the arc length notably improves the accuracy of the estimated station coordinates and scale,but this advantage becomes less noticeable in longer *** 7-day solution also obtains the closet scale results compared to ITRF2014,with the RMSE of 2.10×10^(–9).

关键词： Satellite laser ranging GNSS Geodetic parameters Earth rotation parameters Geocenter motion Terrestrial scale

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Orbit and clock products for quad-system satellites with undifferenced ambiguity fixing approach

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Satellite Navigation 2024年第1期5卷 125-139页

作者： Jiaqi Wu xingxing li Yongqiang Yuan Keke Zhang Xin li Jiaqing Lou Yun Xiong School of Geodesy and Geomatics Wuhan University129 Luoyu RoadWuhan430079China Hubei Luojia Laboratory 129 Luoyu RoadWuhan430079China German Research Centre for Geosciences GFZ Telegrafenberg14473PotsdamGermany Technische Universitat Berlin(TUB) Straße Des 17.Juni10623BerlinGermany

Integer Ambiguity Resolution(IAR)can significantly improve the accuracy of GNSS Precise Orbit Determination(POD).Traditionally,the IAR in POD is achieved at the Double Differenced(DD)*** this contribution,we develop an Un-Differenced(UD)IAR method for Global Positioning System(GPS)+BeiDou Navigation Satellite System(BDS)+Galileo navigation satellite system(Galileo)+Global'naya Navigatsionnaya Sputnikovaya Sistema(GLONASS)quad-system POD by calibrating UD ambiguities in the raw carrier phase and generating the so-called carrier *** on this method,we generate the UD ambiguity-fixed orbit and clock products for the Wuhan Innovation Application Center(IAC)of the International GNSS Monitoring and Assessment System(iGMAS).One-year observations in 2020 from 150 stations are employed to investigate performance of orbit and clock ***,the UD Ambiguity Resolution(AR)yields more resolved integer ambiguities than the traditional DD AR,scaling up to 9%,attributable to its avoidance of station baseline *** from the removal of ambiguity parameters,the computational efficiency of parameter estimation undergoes a substantial 70%*** with the float solution,the orbit consistencies of UD AR solution achieve the accuracy of 1.9,5.2,2.8,2.1,and 2.7 cm for GPS,BeiDou-2 Navigation Satellite System(BDS-2),BeiDou-3 Navigation Satellite System(BDS-3),Galileo,and GLONASS satellites respectively,reflecting enhancements of 40%,24%,54%,34%,and 42%.Moreover,the standard deviations of Satellite Laser Ranging(SLR)residuals are spanning 2.5–3.5 cm,underscoring a comparable accuracy to the DD AR solution,with discrepancies below 5%.A notable advantage of UD AR lies in its capability to produce the Integer Recovered Clock(IRC),facilitating Precise Point Positioning(PPP)AR without requiring additional Uncalibrated Phase Delay(UPD)*** assess the performance of quad-system kinematic PPP based on IRC,a network comprising 120 stations is uti

关键词： Multi-GNSS Precise orbit determination Integer recover clock Undifferenced ambiguity resolution iGMAS innovation application center

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The OsCLV2s-OsCRN1 co-receptor regulates grain shape in rice

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Journal of Genetics and Genomics 2024年第7期51卷 691-702页

作者： xingxing li Meng-en Wu Juncheng Zhang Jingyue Xu Yuanfei Diao Yibo li National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research(Wuhan) Huazhong Agricultural UniversityWuhanHubei 430070China Hubei Hongshan Laboratory WuhanHubei 430070China

The highly conserved CLV–WUS negative feedback pathway plays a decisive role in regulating stem cell maintenance in shoot and floral meristems in higher plants,including Arabidopsis,rice,maize,and ***,we find significant natural variations in the OsCLV2c,OsCLV2d,and OsCRN1 loci in a genome-wide association study of grain shape in ***2a,OsCLV2c,OsCLV2d,and OsCRN1 negatively regulate grain length–width ratio and show distinctive geographical distribution,indica–japonica differentiation,and artificial selection ***,OsCLV2a and OsCRN1 interact biochemically and genetically,suggesting that the two components function in a complex to regulate grain shape of ***,the genetic contributions of the haplotypes combining OsCLV2a,OsCLV2c,and OsCRN1 are significantly higher than those of each single gene alone in controlling key yield *** findings identify two groups of receptor-like kinases that may function as distinct co-receptors to control grain size in rice,thereby revealing a previously unrecognized role of the CLV class genes in regulating seed development and proposing a framework to understand the molecular mechanisms of the CLV–WUS pathway in rice and other crops.

关键词： Rice Grain shape OsCLV2s OsCRN1 Natural variations Indica-japonica differentiation

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基于频域分析的高速列车侧风倾覆机理

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西南交通大学学报 2024年第2期59卷 315-322,342页

作者：王铭李星星李小珍西南交通大学土木工程学院四川成都610031 中国铁路设计集团有限公司天津300308

侧风作用下列车的动态环境以轮轨相互作用为主向,以空气动力作用为主演变,列车的侧风倾覆行为成为威胁列车行车安全性的主要诱因.首先,采用精细化车-轨耦合模型开展列车侧风倾覆的频域特性分析,以明确侧风倾覆响应对列车模型的敏感性;... 详细信息

侧风作用下列车的动态环境以轮轨相互作用为主向,以空气动力作用为主演变,列车的侧风倾覆行为成为威胁列车行车安全性的主要诱因.首先,采用精细化车-轨耦合模型开展列车侧风倾覆的频域特性分析,以明确侧风倾覆响应对列车模型的敏感性;基于考虑模态特性的频域分析框架,推导脉动风及轨道不平顺与列车倾覆动力响应间的传递函数,结合相应参数进行分析,以直观揭示列车的侧风倾覆机理.结果表明:列车倾覆行为受绕车体下心侧滚模态和车体沉浮模态控制影响,其风荷载影响要明显大于轨道不平顺;在轨道不平顺激励下,第一阶模态贡献主要由轨向不平顺引起,第二阶模态贡献主要由高低不平顺引起,在脉动风荷载激励下,其顺风向脉动风分量起主要贡献;车速、风速和风向角的增大都会引起列车动力响应的增大,进而降低列车安全运营时的最大允许风速;失效概率的增大会降低动力响应的极值,进而提高安全运营风速.

关键词：风效应高速列车侧风倾覆危险性频域分析解析模型

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Large and nonlinear electric field response in a two-dimensional ferroelectric Rashba material

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中国科学技术大学学报 2024年第6期54卷 8-11,21,I0009页

作者： li Sheng Xiaomin Fu Chao Jia xingxing li Qunxiang li Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of ChinaHefei 230026China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

The achievement of electrical spin control is highly *** promising strategy involves electrically mod-ulating the Rashba spin orbital coupling effect in materials.A semiconductor with high sensitivity in its Rashba constant to external electric fields holds great potential for short channel lengths in spin field-effect transistors,which is crucial for preserving spin coherence and enhancing integration ***,two-dimensional(2D)Rashba semiconductors with large Rashba constants and significant electric field responses are highly ***,by employing first-principles calculations,we design a thermodynamically stable 2D Rashba semiconductor,YSbTe_(3),which possesses an indirect band gap of 1.04 eV,a large Rashba constant of 1.54 eV·Åand a strong electric field response of up to 4.80 e·Å^(2).In particular,the Rashba constant dependence on the electric field shows an unusual nonlinear *** the same time,YSbTe_(3)has been identified as a 2D ferroelectric material with a moderate polarization switching energy barrier(~0.33 eV per formula).By changing the electric polarization direction,the Rashba spin texture of YSbTe_(3)can be *** out-standing properties make the ferroelectric Rashba semiconductor YSbTe_(3)quite promising for spintronic applications.

关键词： computational chemistry Rashba effect ferroelectrics spintronics

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Unexpected nucleation mechanism of T1 precipitates by Eshelby inclusion with unstable stacking faults

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Materials Genome Engineering Advances 2024年第2期2卷 134-144页

作者： Shuo Wang Junsheng Wang Chengpeng Xue Xinghai Yang Guangyuan Tian Hui Su Yisheng Miao Quan li xingxing li School of Materials Science and Engineering Beijing Institute of TechnologyBeijingChina Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijingChina

Aluminum-lithium(Al-li)alloy is one of the most promising lightweight structural materials in the aeronautic and aerospace *** key to achieving their excellent mechanical properties lies in tailoring T1 strengthening precipitates;however,the nucleation of such nanoparticles remains *** atomic resolution HAADF-STEM with first-principles calculations based on the density functional theory(DFT),here,we report a counterintuitive nucleation mechanism of the T1 that evolves from an Eshelby inclusion with unstable stacking *** precursor is accelerated by Ag-Mg clusters to reduce the barrier,forming the structural *** addition,these Ag-Mg clusters trap the free Cu and li to prepare the chemical compositions for *** findings provide a new perspective on the phase transformations of complex precipitates through solute clusters in terms of geometric structure and chemical bonding functions.

关键词： Al alloy DFT nucleation phase tranformation precipitation

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Predicting the effect of cooling rates and initial hydrogen concentrations on porosity formation in Al-Si castings

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Materials Genome Engineering Advances 2024年第3期2卷 117-129页

作者： Qinghuai Hou Junsheng Wang Yisheng Miao xingxing li Xuelong Wu Zhongyao li Guangyuan Tian Decai Kong Xiaoying Ma Haibo Qiao Wenbo Wang Yuling Lang School of Materials Science and Engineering Beijing Institute of TechnologyBeijingChina Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijingChina School of Mechanical Engineering Beijing Institute of TechnologyBeijingChina CITIC Dicastal Co. Ltd.QinhuangdaoHebei ProvinceChina

Al-Si alloys are widely used in automotive casting components while microporosity has always been a detrimental defect that leads to property *** this study,a coupled three-dimensional cellular automata(CA)model has been used to predict the hydrogen porosity as functions of cooling rate and initial hydrogen *** quantifying the pore characteristics,it has been found that the average equivalent pore diameter decreases from 40.43 to 23.98μm and the pore number density increases from 10.3 to 26.6 mm^(−3)as the cooling rate changes from 2.6 to 19.4℃/s at the initial hydrogen concentration of 0.25 mL/100 *** is also notable that the pore size increases as the initial hydrogen concentration changes from 0.15 to 0.25 mL/100 g while the pore number remains *** addition,the linear regression between secondary dendrite arm spacing and the equivalent pore diameter has been studied for the first time,matching well with *** work exhibits the application of CA model in future process optimization and robust condition design for advanced automotive parts made of Al-Si alloys.

关键词： Al-Si alloy cellular automata cooling rate microporosity secondary dendrite arm spacing solidification

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职场通讯压力对员工创新行为的影响机制研究

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安徽商贸职业技术学院学报 2024年第2期23卷 25-31页

作者：李星星安徽商贸职业技术学院金融科技学院安徽芜湖241002

职场通讯压力是工作中难以避免的问题,然而,职场通讯压力与员工创新行为之间的关系尚不明晰。依据工作要求—资源理论和社会交换理论,构建职场通讯压力对员工创新行为的双重链式中介模型。实证结果表明:职场通讯压力对员工创新行为有显... 详细信息

职场通讯压力是工作中难以避免的问题,然而,职场通讯压力与员工创新行为之间的关系尚不明晰。依据工作要求—资源理论和社会交换理论,构建职场通讯压力对员工创新行为的双重链式中介模型。实证结果表明:职场通讯压力对员工创新行为有显著的正向影响。具体而言,职场通讯压力通过心理依附和工作—家庭增益的链式中介作用正向影响员工创新行为。研究结论为如何增强员工创新行为提供有力的实践指导。

关键词：职场通讯压力心理脱离心理依附工作—家庭冲突工作—家庭增益

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绿色金融对区域绿色创新能力的影响

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太原城市职业技术学院学报 2024年第2期 168-174页

作者：李星星安徽商贸职业技术学院金融科技学院安徽芜湖241002

探究绿色金融通过技术进步提升区域绿色创新能力的影响及其程度。采用2009-2020年省级面板数据,运用中介效应模型和门槛效应模型考察绿色金融对区域绿色创新能力的影响及其作用机制。研究发现,绿色金融既能直接促进区域绿色创新能力提升... 详细信息

探究绿色金融通过技术进步提升区域绿色创新能力的影响及其程度。采用2009-2020年省级面板数据,运用中介效应模型和门槛效应模型考察绿色金融对区域绿色创新能力的影响及其作用机制。研究发现,绿色金融既能直接促进区域绿色创新能力提升,也能通过提高技术进步水平显著地促进区域绿色创新能力提升;绿色金融、技术进步对区域绿色创新能力的影响均存在单一门槛效应。据此,提出合理发展绿色金融、鼓励使用绿色金融产品、提升技术进步水平等相关政策建议,以期为提升区域绿色创新能力提供参考。

关键词：绿色金融区域绿色创新能力技术进步中介效应模型门槛效应模型

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