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Circularly polarized luminescence of coordination aggregates

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Aggregate

Aggregate 2022年第5期3卷 82-99页

作者： zhong-liang Gong zhong-qiu li Yu-Wu zhong Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of PhotochemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijingChina School of Chemical Sciences University of Chinese Academy of SciencesBeijingChina

The development and applications of materials with efficient circularly polarized luminescence(CPL)have become an interdisciplinary frontier research *** summarize herein the recent advance in the development and applications of CPLactive aggregates based on metal-ligand coordination materials(termed as“coordination aggregates”).The materials surveyed are classified as aggregates of smallmolecular metal complexes,which include monocomponent assemblies of Pt(II)complexes and other complexes and binary aggregates of metal complexes,and CPL-active metal-ligand coordination helicates,polymers,and *** efforts in improving the dissymmetry luminescence factors and quantum yields of these materials and the use of the aggregation strategy in enhancing the performance of isolated molecules are *** recent applications of chiral metal complexes in circularly polarized organic light-emitting diodes(OLEDs)based on solution-or evaporation-processed procedures are *** addition,the uses of lanthanide complexes in CPL-contrast imaging and as CPL probes are *** common discussion on the mechanism of aggregation-enhanced CPLs and a perspective on future works of CPL-active coordination aggregates are finally given.

关键词： chiral metal complexes circularly polarized luminescence coordination helicates and polymers liquid crystals metal-organic frameworks supramolecular assemblies

Circularly polarized phosphorescence and photon transport of micro/nanocrystals of ruthenium and iridium complexes with chiral anions

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中国科学:化学英文版 2023年第10期66卷 2892-2902页

作者： zhong-qiu li zhong-liang Gong Tongling liang Stefan Bernhard Yu-Wu zhong Jiannian Yao Beijing National Laboratory for Molecular Sciences(BNLMS) CAS Key Laboratory of PhotochemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Chemistry Carnegie Mellon UniversityPittsburghPennsylvania 15213USA

Materials with efficient circularly polarized phosphorescences(CPPs) are of potential use in advanced data encryption and anticounterfeiting, bioimaging, optoelectronic devices and so forth. Herein, a simple method is presented for the preparations of CPP-active micro/nanocrystals with large luminescence dissymmetry factors(glum), high phosphorescence quantum efficiencies(Φ_(P)) and tunable emission colors. Diastereomeric Ir^(Ⅲ) and Ru^(Ⅱ) complexes with chiral(±)-camphorsulfonate counter-anions are readily synthesized and assembled into crystalline microrods, microplates or nanofibers with ordered morphologies. The chirality information of chiral counter-anions is efficiently transferred to the metal components to afford CPPs with cyan, green,yellow, or red emission colors and Φ_(P)in the range of 5%–85%. The number of chiral anions is found to play a role in influencing the CPP magnitudes of these crystals. The dicationic Ru^(Ⅱ) and tricationic Ir^(Ⅲ) complexes show glumvalues in the 10^(-2)order, which are much larger with respect to those of monocationic Ir^(Ⅲ) complexes. Single crystal X-ray analysis is performed to obtain information on the chirality transfer of these materials. In addition, circularly polarized photonic signal waveguiding is demonstrated using the microcrystals of an Ir^(Ⅲ)complex. This work demonstrates an appealing strategy of constructing chiral micro/nano-architectures for potential applications in chiral nanophotonics.

关键词： circularly polarized luminescence transition metal complexes chirality transfer micro/nanocrystals photon transport

A sensitive and validated LC-MS/MS method for high-throughput determination of pomalidomide in human plasma and pharmacokinetic studies

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Chinese Chemical Letters 2022年第2期33卷 916-919页

作者： Chang Shu Teng-Fei li Duo li zhong-qiu li Xing-Hua Xia State Key Laboratory of Analytical Chemistry for life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Pharmaceutical Analysis School of PharmacyChina Pharmaceutical UniversityNanjing 210009China School of Pharmacy Department of Clinical PharmacologySir Run HospitalNanjing Medical UniversityNanjing 211166China

Pomalidomide is an immunomodulatory agent (IMiD) that has been approved by the US Food and Drug Administration (FDA) for clinical treatment of patients with multiple *** this work,we developed a sensitive and validated LC-MS/MS method for high-throughput determination of pomalidomide over the range of 1.006-100.6 ng/mL(R^(2)=0.9991) in human plasma and pharmacokinetic studies.A liquid-liquid extraction method using ethyl acetate was applied to extract pomalidomide and afatinib (as an internal standard,IS) from human *** separation was performed on a Hedera ODS column (150 mm×2.1 mm,5μm) with security guard C18 column (4 mm×2.0 mm) at 40℃.Methanol and 10 mmol/L aqueous solution of ammonium acetate containing 0.1%formic acid were used as a gradient elution mobile phase,and the flow rate was 0.4 mL/min.A triple quadruple tandem mass spectrometer using multiplex reaction monitoring mode (MRM) with electrospray ionization (ESI) positive ionization was *** precursor to product ion transitions for the quantitative analysis of pomalidomide and the IS were m/z 274.2→163.1 and m/z 486.1→371.1,*** established method has been validated according to regulatory guideline,and the results were all within the acceptance *** validated LC-MS/MS method was successfully applied to analyze samples obtained from clinical pharmacokinetics study after oral administration of pomalidomide (4 mg) capsules in human.

关键词： Pomalidomide liquid-liquid extraction LC–MS/MS method Pharmacokinetic Human plasma

Electric Field Driven Surface Ion Transport in Hydrophobic Nanopores

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Chinese Journal of Chemistry 2021年第6期39卷 1511-1516页

作者： Xin-Lei Ding Zeng-Qiang Wu zhong-qiu li Xing-Hua Xia State Key Laboratory of Analytical Chemistry for life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu 210023China

Water behavior in nanoconfined hydrophobic environment is different from that in the bulk,which greatly influences mass *** switching of nanopores showing great potential for controlled water or ion transport has been realized through several methods,especially the voltage-triggered wetting/dewetting inspired by biological ion ***,in the hydrophobic silanized nanopores,the finite ionic current is still observed and the ion transport mechanism is not yet ***,we explore the ion transport behavior in the hydrophobic silanized anodic aluminum oxide(AAO).Ion transport through this hydrophobic membrane is confirmed,although no aqueous pathway was *** show that ions transport through the cross-linked silane layer on the inner *** is revealed that metal ions,not just the protons or hydroxide ions,are involved in the ion transport driven by external electric *** study provides a new insight into the ion transport in nanoconfined hydrophobic environment which is helpful to understand the biological processes and design new nanofluidic devices.

关键词： Hydrophobic interface Surface ion transport Nanotechnology Surface chemistry Silanes

Robust-augmentation nonlinear dynamic inversion control of over-actuated coaxial high-speed helicopter in transition mode

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Chinese Journal of Aeronautics 2024年第8期37卷 404-420页

作者： Yuqing qiu Yan li Jinxi LANG Yuxian liU zhong WANG School of Automation Northwestern Polytechnical UniversityXi’an 710129China

As the elevator and rudder can be used actively for control,in addition to the rotors,Coaxial High-speed Helicopters(CHHs)have the problems of control redundancy and changing control authority in the transition *** paper presents a robust-augmentation transitioning flight control design for a CHH under the adverse conditions of parametric uncertainties and external ***,based on control characteristic analysis,an Adaptive Filtered Nonlinear Dynamic Inversion(AFNDI)controller is proposed for the angular rate to handle the effect of unknown unstructured uncertainties and external *** analysis proves that the presented angular rate controller can guarantee steady-state and transient ***,the attitude angle and velocity controllers are also ***,an Incremental-based Nonlinear Prioritizing Control Allocation(INPCA)method is designed to take into account control surface transition and changing control authority,which efficiently distributes the required moments between coaxial rotors and aero-surfaces,and avoids the control reversal problem of the yaw *** the proposed control architecture,the low-pass filter is introduced to alleviate the adverse influence of time delay and measurement ***,the effectiveness of the proposed controller is demonstrated through nonlinear numerical simulations,and is compared with existing *** results show that the proposed control law can improve both capabilities of disturbance rejection and fast response,and works satisfactorily for the CHH transitioning control characteristic.

关键词： Coaxial high-speed helicopter Transition mode Attitude control Control allocation Robust adaptive control

新疆焉耆盆地主要作物需水量特征及影响因素分析

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土壤通报 2024年第1期55卷 57-67页

作者：张旭辉玉素甫江·如素力仇忠丽亚夏尔·艾斯克尔阿卜杜热合曼·吾斯曼新疆师范大学地理科学与旅游学院流域信息集成与生态安全实验室新疆乌鲁木齐830054 新疆干旱区湖泊环境与资源重点实验室新疆乌鲁木齐830054

【目的】探究新疆焉耆盆地主要作物需水量特征及影响因素,为干旱区农业水资源利用和作物种植结构优化提供参考。【方法】基于2000~2020年焉耆盆地3个气象站点的逐日气象观测资料,采用Penman-Monteith公式和作物系数法,计算焉耆盆地主要... 详细信息

【目的】探究新疆焉耆盆地主要作物需水量特征及影响因素,为干旱区农业水资源利用和作物种植结构优化提供参考。【方法】基于2000~2020年焉耆盆地3个气象站点的逐日气象观测资料,采用Penman-Monteith公式和作物系数法,计算焉耆盆地主要作物生育期内需水量、有效降水量和灌溉需水量,并用Mann-Kendall检验、线性分析法和通径分析法对以上数据的分布特征、变化趋势及影响因素进行定量研究。【结果】①近21年参考作物蒸散量呈逐年增加趋势,变化率为6.90 mm a^(−1),分布范围为960.20~1264.50 mm,年均值为1154.70 mm。②全生育期主要作物需水量为374.94~713.37 mm,不同生育阶段作物需水量、有效降水量和灌溉需水量的峰值均出现在生育中期,分别为247.32~497.92 mm、7.14~21.94 mm和240.18~475.99 mm,高于生育初期、快速发育期和成熟期。③主要作物需水量和灌溉需水量呈增加趋势,平均变化率分别为3.86 mm a^(−1)和4.09 mm a^(−1);有效降水量呈减少趋势,平均变化率为−0.23 mm a^(−1)。④影响主要作物需水量的主要因素有平均风速、平均气温、最高气温和日照时间,影响主要作物灌溉需水量的主要因素有平均风速、日照时间、最高气温和降水量。【结论】主要作物各生育阶段的有效降水量分配不均衡,在生育中期有效降水量达到峰值情况下,仍需通过农业灌溉来满足作物生长对水分的需求。制定完善的灌溉制度,才能提高农业水资源利用效率,保障干旱区粮食产量和农业可持续发展。

关键词：作物需水量有效降水量灌溉需水量影响因素焉耆盆地

DynIceData:a gridded ice-water classification dataset at short-time intervals based on observations from multiple satellites over the marginal ice zone

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Big Earth Data 2024年第2期8卷 249-273页

作者： lin Huang Yubao qiu Yang li Shuwen Yu Wanyang zhong Changyong Dou Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijingChina International Research Center of Big Data for Sustainable Development Goals BeijingChina University of Chinese Academy of Sciences BeijingChina School of Resources and Geosciences China University of Mining and TechnologyXuzhouChina

High-resolution observations of short-term changes in sea ice are critical to understanding ice dynamics and also provide important information used in advice to shipping,especially in the *** individual satellite sensors provide periodic sea ice obser-vations with spatial resolutions of tens of meters,information regarding changes that occur over short time intervals of minutes or hours is *** this study,a gridded ice-water classification dataset with a high temporal resolution was developed based on observations acquired by multiple satellite sensors in the Marginal Ice Zone(MIZ).This dataset-DynIceData-which combines Sentinel-1 Synthetic Aperture Radar(SAR)data with Gaofen-3(GF-3)SAR and SDGSAT-1 thermal infrared imagery was used to obtain observations of the MIZ with a range of temporal resolutions ran-ging from minutes to tens of *** areas of the Arctic covered include the Kara Sea,Beaufort Sea,and Greenland Sea during the period from August 2021 to August ***-oriented segmen-tation and thresholding were used to obtain the ice-water classifi-cation map from Sentinel-1 and GF-3 SAR image pairs and Sentinel-1 SAR and SDGSAT-1 thermal image *** time interval between the images in each pair ranged from 1 minute to 68 ***-kilometer grid sample granules with a spatial resolution of 25 m for the GF-3 SAR data and 30 m for the SDGSAT-1 thermal data were *** classification was verified as having an overall accuracy of at least 95.58%.The DynIceData dataset consists of 7338 samples,which could be used as reference data for further research on rapid changes in sea ice patterns at different short time scales and provide support for research on thermodynamic and dynamic models of sea ice in combination with other environmen-tal data,thus potentially improving the accuracy of sea ice forecast-ing using Artificial *** dataset can be accessed at https://***/10.57760/sciencedb.j00001.00784.

关键词： Sea ice dynamics ice-water classification GF-3 SDGSAT-1 marginal ice zone

Influence of Recycled Concrete Fine Powder on Durability of Cement Mortar

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Fluid Dynamics & Materials Processing 2024年第1期20卷 45-58页

作者： Yadong Bian Xuan qiu Jihui Zhao zhong li Jiana Ouyang School of Architectural and Civil Engineering Zhongyuan University of TechnologyZhengzhou450007China School of Civil Engineering Sun Yat-Sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai519082China

In this paper,the durability of cement mortar prepared with a recycled-concrete fine powder(RFP)was examined;including the analysis of a variety of aspects,such as the carbonization,sulfate attack and chloride ion erosion *** results indicate that the influence of RFP on these three aspects is *** carbonization depth after 30 days and the chloride diffusion coefficient of mortar containing 10%RFP decreased by 13.3%and 28.19%.With a further increase in the RFP content,interconnected pores formed between the RFP particles,leading to an acceleration of the penetration rate of CO_(2)and Cl^(−).When the RFP content was less than 50%,the corrosion resistance coefficient of the compressive strength of the mortar was 0.84-1.05 after 90 days of sulfate *** the expansion and cracking of the mortar was effectively alleviated due to decrease of the gypsum *** electron microscope(SEM)analysis has confirmed that 10%RFP contributes to the formation of a dense microstructure in the cement mortar.

关键词： Recycled concrete fine powder cement mortar carbonization sulfate chloride ion durability

Research on the mechanism of the two-dimensional ultrasonic surface burnishing process to enhance the wear resistance for aluminum alloy

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Friction 2024年第3期12卷 490-509页

作者： Zhen-Yu ZHOU qiu-Yang ZHENG Yu li Cong DING Guang-Jian PENG zhong-Yu PIAO College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education and Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310014China

The gradient nanostructure is machined on the aluminum(Al)alloy by the two-dimensional ultrasonic surface burnishing process(2D-USBP).The mechanism of why the gradient nanostructure enhances wear resistance is *** mechanical properties and microstructure characterization for the gradient nanostructure are performed by operating a nanoindenter,transmission electron microscopy(TEM),and electron backscattered diffraction(EBSD).Dry wear tests are performed on the samples before and after machining to evaluate the wear resistance and *** effect of the gradient nanostructure on the wear resistance is explored by developing the crystal plasticity(CP)finite element and molecular dynamics(MD)*** characterization results show that the 2D-USBP sample prepared a gradient structure of~600μm thick on the aluminum surface,increasing the surface hardness from 1.13 to 1.71 GPa and reducing the elastic modulus from 78.84 to 70.14 *** optimization of the surface microstructure and the increase of the mechanical properties effectively enhance the wear resistance of the sample,with 41.20%,39.07%,and 54.58% of the wear scar areas for the 2D-USBP treated samples to the original samples under 5,10,and 15 N loads,*** gradient nanostructure hinders the slip of dislocations inside the sample during the wear process and reduces the size and scope of plastic deformation;meanwhile,the resistance to deformation,adhesion,and crack initiation and propagation of the sample surface is improved,resulting in enhanced wear resistance.

关键词： structural superlubricity lattice registry elastic deformation strained solitons crystal plasticity molecular dynamics simulations