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Rational design of far red to near-infrared rhodamine analogues with huge Stokes shifts for single-laser excitation multicolor imaging

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Chinese Chemical Letters 2021年第12期32卷 3890-3894页

作者： Xingxing Zhang Tianbing Ren feiyu yang Lin Yuan State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Rhodamine dyes have been widely employed in biological imaging and sensing. However, it is always a challenge to design rhodamine derivatives with huge Stokes shift to address the draconian requirements of single-excitation multicolor imaging. In this work, we described a generally strategy to enhance the Stokes shift of rhodamine dyes by completely breaking their electronic symmetry. As a result, the Stokes shift of novel rhodamine dye DQF-RB-Cl is up to 205 nm in PBS, which is the largest in all the reported rhodamine derivatives. In addition, we successfully realized the single excitation trichromatic imaging of mitochondria, lysosomes and cell membranes by combining DQF-RB-Cl with commercial lysosomal targeting probe Lyso-Tracker Green and membrane targeting dye Dil. This is the organic synthetic dyes for SLE-trichromatic imaging in cells for the first time. These results demonstrate the potential of our design as a useful strategy to develop huge Stokes shift fluorophore for bioimaging.

关键词： Fluorescent dyes Rhodamine analogues Huge stokes shifts Single-laser excitation Multicolor imaging

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海水环境下硫酸盐侵蚀钙质砂注浆体试验研究

山东大学学报（工学版） 2024年第4期54卷 122-130,140页

作者：孙悦张文亮张建鹏王蕾李鹏杨飞宇何灵垚中国海洋大学工程学院山东青岛266404 山东高速集团有限公司创新研究院山东济南250101 青岛绿城华川置业有限公司山东青岛266199 中铁十六局第三工程有限公司浙江湖州313002

为研究硫酸根离子侵蚀效应对钙质砂吹填岛礁注浆加固钙质砂地基服役性能的影响,采用耦合温度和离子浓度的加速侵蚀方法,基于海水侵蚀试验装置开展不同水泥类型、侵蚀时间、水灰比条件下硫酸根离子对于注浆结石体性能的弱化试验。获得海... 详细信息

为研究硫酸根离子侵蚀效应对钙质砂吹填岛礁注浆加固钙质砂地基服役性能的影响,采用耦合温度和离子浓度的加速侵蚀方法,基于海水侵蚀试验装置开展不同水泥类型、侵蚀时间、水灰比条件下硫酸根离子对于注浆结石体性能的弱化试验。获得海水中硫酸根离子对注浆结石体力学性能及渗透性能的影响规律,并对侵蚀后的注浆结石体进行微观测试,揭示硫酸根离子对钙质砂注浆结石体的侵蚀弱化机理。试验结果表明,硫酸根离子渗透注浆结石体内部与水化反应产物发生反应生成石膏以及钙矾石等产物引发注浆结石体发生侵蚀破坏,而动水环境会加剧硫酸根离子对注浆结石体的侵蚀弱化效应,动水侵蚀组结石体在侵蚀时间为3.28 a时,抗压强度为5.41 MPa,较淡水对照组降低23.9%;渗透系数为7.159×10^(-5)cm/s,较淡水对照组增大6.691×10^(-5)cm/s。

关键词：钙质砂注浆加固硫酸根离子动水环境侵蚀弱化

Evolving a novel red-emitting two-photon dye with optically tunable amino group for monitoring the degree of hypoxia during liver fibrosis

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Chinese Chemical Letters 2023年第5期34卷 480-483页

作者： Xingxing Zhang feiyu yang Tianbing Ren Yingxin Zheng Xiao-Bing Zhang Lin Yuan State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Two-photon imaging has attracted increasing attention owing to its deep tissue imaging ***,many fluorophores have been developed to satisfy its ***,long-wavelength emission fluorophores with an optically tunable group are rarely *** this study,two longwavelength emission fluorophores with an optically tunable amino group were successfully developed by introducing strong electron acceptor and large conjugated group to the TPQL ***_(2)displayed a bright red emission(λem=638 nm,Φ=0.15)together with high two-photon action cross section and good water solubility,which enabled higher signal-to-background ratios and deep tissue *** proof-of-concept probe(TPCO-NO_(2))was successfully applied to the high signal-to-background ratio imaging of nitroreductase in liver fibrosis,further realizing diagnosis of the degree of hypoxia during liver fibrosis.

关键词： Fluorescent probes Two-photon imaging Fluorophores Nitroreductase Hypoxia

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复杂环境下蠕变效应对沥青混合料性能的影响

交通科学与工程 2024年第4期40卷 1-10,20页

作者：何忠明李雅倩谢唐新欧剑珺杨菲玉长沙理工大学交通运输工程学院湖南长沙410114 长沙理工大学公路养护技术国家工程研究中心湖南长沙410114

为了探究沥青混合料在高、低温条件下的性能变化,以及各种环境因素对其的影响程度,基于Burgers模型和沥青混合料的蠕变效应,通过自主开发的环境模拟仪对沥青混合料进行了基本性能试验,并采用灰色关联度分析方法评估单一因素对沥青混合... 详细信息

为了探究沥青混合料在高、低温条件下的性能变化,以及各种环境因素对其的影响程度,基于Burgers模型和沥青混合料的蠕变效应,通过自主开发的环境模拟仪对沥青混合料进行了基本性能试验,并采用灰色关联度分析方法评估单一因素对沥青混合料高、低温性能的影响程度。同时,采用主成分分析方法进一步揭示了耦合因素对沥青混合料高、低温性能的影响规律。研究发现:单因素对添加了苯乙烯-丁二烯-苯乙烯聚合物(styrenebutadiene-styrene,SBS)的改性沥青混合料高、低温性能的影响程度从大到小的排序为高温、紫外线、降雨;相较于单一因素,耦合因素对SBS改性沥青混合料高、低温性能影响更为显著,其中,耦合因素作用中起首要作用的是紫外线。Burgers模型的拟合结果表明:黏弹性参数会随着环境作用循环天数和环境因素的增多而逐渐降低,进而导致沥青混合料高、低温性能逐渐衰减,究其原因是沥青混合料中的黏性和弹性组分发生了转换。

关键词：沥青混合料 Burgers模型蠕变高温性能低温性能

Design strategies for rechargeable aqueous metal-ion batteries

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Science China Chemistry 2024年第1期67卷 165-190页

作者： yang Li Xin Zhao Yifu Gao Yichen Ding Zhichun Si Liubing Dong Dong Zhou feiyu Kang Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China College of Chemistry and Materials Science Jinan UniversityGuangzhou 511443China

Rechargeable aqueous metal-ion batteries(AMBs)have attracted extensive scientific and commercial interest due to their potential for cost-effective,highly safe,and scalable stationary energy ***,their limited output voltage,inadequate energy density,and poor reversibility of ambiguous electrode reactions in aqueous electrolytes strongly limit their practical *** review aims to elucidate the challenges of existing AMBs from the material design to whole device *** summarize the emerging electrochemistry,fundamental properties,and key issues in interfacial behaviors of various classes of prevailing AMBs,including aqueous alkali metal-ion batteries and multivalent-ion batteries,and present an appraisal of recent advances for addressing the performance ***,the progress of zinc-ion batteries is highlighted to provide a ubiquitous guideline for their commercialization in the grid-scale energy ***,we figure out the dominating general challenges for achieving high-performance AMBs,laying out a perspective for future breakthroughs.

关键词： aqueous metal-ion batteries aqueous alkali metal-ion batteries zinc-ion batteries interfacial behavior stationary energy storage

The evolutionary trajectory of the rural settlements in Southern Jiangsu in the past 20 years:From the perspective of urbanization and land use

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Journal of Geographical Sciences 2024年第8期34卷 1615-1635页

作者： CHEN feiyu CHEN Cheng Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and LimnologyCASNanjing 210008China Nanjing College University of Chinese Academy of SciencesNanjing 211135China

For a long time,due to lack of accurate data covering large areas,it is difficult to capture the continuous spatial evolutionary trajectory of rural settlements shaped by rapid urbanization and rural land use *** fill this gap,based on theoretical analysis this paper systemically detected the changing characteristics of scale,spatial morphology,distribution,and land use pattern of rural settlements in Southern Jiangsu in the past 20 years depending on the data of land resource survey in 2009 and *** study suggests that the total area and per capita size of rural settlements declined by 30%and 2%respectively as a result of rural land consolidation and the influx of enormous immigrants from underdeveloped *** spatial density and average shape index dropped by 14%and 44%respectively in the recent decade,indicating an evident trend of decentralization in spatial distribution,and regularization in the spatial ***,residential land within rural settlements decreased by 33%over the past decade while the land for industry and commercial service steadily increased,demonstrating that the function for manufacturing and diversified services had been *** the emerging issue of the aging population and new business opportunities in rural Southern Jiangsu,rural settlements regeneration might be the focus offutureresearch.

关键词： rural settlements spatial morphology land use Southern Jiangsu

Stroke Risk Assessment Decision-Making Using a Machine Learning Model:Logistic-AdaBoost

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Computer Modeling in Engineering & Sciences 2024年第4期139卷 699-724页

作者： Congjun Rao Mengxi Li Tingting Huang feiyu Li School of Science Wuhan University of TechnologyWuhan430070China Wuhan University of Technology Hospital Wuhan University of TechnologyWuhan430070China

Stroke is a chronic cerebrovascular disease that carries a high *** risk assessment is of great significance in preventing,reversing and reducing the spread and the health hazards caused by *** to objectively predict and identify strokes,this paper proposes a new stroke risk assessment decision-making model named Logistic-AdaBoost(Logistic-AB)based on machine ***,the categorical boosting(CatBoost)method is used to perform feature selection for all features of stroke,and 8 main features are selected to form a new index evaluation system to predict the risk of ***,the borderline synthetic minority oversampling technique(SMOTE)algorithm is applied to transform the unbalanced stroke dataset into a balanced ***,the stroke risk assessment decision-makingmodel Logistic-AB is constructed,and the overall prediction performance of this new model is evaluated by comparing it with ten other similar *** comparison results show that the new model proposed in this paper performs better than the two single algorithms(logistic regression and AdaBoost)on the four indicators of recall,precision,F1 score,and accuracy,and the overall performance of the proposed model is better than that of common machine learning *** Logistic-AB model presented in this paper can more accurately predict patients’stroke risk.

关键词： Stroke risk assessment decision-making CatBoost feature selection borderline SMOTE Logistic-AB

Multi-Material Topology Optimization for Spatial-Varying Porous Structures

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工程与科学中的计算机建模(英文) 2024年第1期138卷 369-390页

作者： Chengwan Zhang Kai Long Zhuo Chen Xiaoyu yang feiyu Lu Jinhua Zhang Zunyi Duan State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510640China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China Institute of Structural Health Monitoring and Control School of MechanicsCivil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an710072China

This paper aims to propose a topology optimization method on generating porous structures comprising multiple *** mathematical optimization formulation is established under the constraints of individual volume fraction of constituent phase or total mass,as well as the local volume fraction of all *** original optimization problem with numerous constraints is converted into a box-constrained optimization problem by incorporating all constraints to the augmented Lagrangian function,avoiding the parameter dependence in the conventional aggregation ***,the local volume percentage can be precisely *** effects including the globalmass bound,the influence radius and local volume percentage on final designs are exploited through numerical *** numerical results also reveal that porous structures keep a balance between the bulk design and periodic design in terms of the resulting *** results,including those for irregular structures andmultiple volume fraction constraints,demonstrate that the proposedmethod can provide an efficient solution for multiple material infill structures.

关键词： Topology optimization porous structures local volume fraction augmented lagrangian multiple materials

Gbps key rate passive-state-preparation continuous-variable quantum key distribution within an access-network area

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Photonics Research 2024年第7期12卷 1485-1493页

作者： feiyu JI PENG HUANG TAO WANG XUEQIN JIANG GUIHUA ZENG State Key Laboratory of Advanced Optical Communication Systems and Networks Center for Quantum Sensing and Information ProcessingSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China College of Information Science and Technology Donghua UniversityShanghai 201620China

The conventional Gaussian-modulated coherent-state quantum key distribution(QKD) protocol requires the sender to perform active modulations based on a true random number generator. Compared with it, the passive-state-preparation(PSP) continuous-variable quantum key distribution(CVQKD) equivalently performs modulations passively by exploring the intrinsic field fluctuations of a thermal source, which offers the prospect of chip integration QKD with low cost. In this paper, we propose and experimentally demonstrate a high-rate PSP-CVQKD scheme within an access-network area using high-bandwidth detectors in a continuous wave encoding and decoding way. By proposing effective methods for suppressing the noises during the PSP process and polarization multiplexing to decrease the photon leakage noises, we realize the high-intensity local oscillator transmission, thereby achieving coherent detection with high efficiency, low noise, and high bandwidth. The secure key rates over transmission distance of 5.005 km with and without consideration of the finite-size effect are 273.25 Mbps and 1.09 Gbps. The use of the PSP method boosts the asymptotic secret key rate of CVQKD to Gbps level for the first time, to our knowledge, within the range of the access network, which provides an effective and secure key distribution strategy for high-speed quantum cryptography access communication.

关键词： passive network distribution