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Mainchain conformation ordering self-assembly tailored room temperature phosphorescence emission

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Science China Chemistry 2025年第1期68卷 329-336页

作者： Yuzhu Li Yumeng Gao Feng Tian Yu Wang yuan Yao Shaoliang Lin Xiang Ma Binbin Xu Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Key Laboratory for Advance Materials and Feringa Noble Prize Scientist Joint Research Centre Frontiers Science for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science & Technology

Developing organic room-temperature phosphorescence （RTP） materials with a wide range of tunable-emission is significant in expanding the applications of RTP ***,we rationally designed amphiphilic alternating copolymers poly(1,2-bis（4-alkoxyphenyl）ethane-1,2-dione-alt-（ethylene glycol）x)(P（Bz-alt-EGx）) that combined the advantage of alternating benzil and EGxskeleton,and tunable mainchain *** a mainchain conformation ordering assembly （COA） process,P（Bz-alt-EGx） self-assembled into well-defined platelets,and such assemblies emitted blue RTP at ca.425 nm due to the ordered folded-chain conformation and confined *** contrast,traditional self-assembly （TA） of P（Bz-alt-EGx） obtained less ordered aggregates,such as asymmetric worms,vesicles,and rod-like *** resultant less ordered aggregates exhibited yellow-green RTP at ca.550 *** wide-tuning RTP emission in solution （between blue and yellow-green,over125 nm） is realized using the P（Bz-alt-EGx） alternating copolymers under the treatment of different self-assembly *** study uncovers a new strategy to tailor the RTP emission through different self-assembly pathways and holds great promise for the fabrication of advanced optical materials.

关键词： self-assembly conformation ordering alternating copolymer phosphorescence emission

Trial application of the envelope method to the potential ambiguity problem

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Nuclear Science and Techniques 2024年第1期35卷 73-80页

作者： Li-yuan Hu Yu-shou Song Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering UniversityHarbin 150001China College of Nuclear Science and Technology Harbin Engineering UniversityHarbin 150001China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Ministry of Industry and Information TechnologyHarbin 150001China

The optical potential ambiguity is a long-standing problem in the analysis of elastic scattering *** a specific collid-ing system,ambiguous potential families can lead to different behaviors in the nearside and farside scattering *** contrast,the envelope method can decompose the experimental data into two components with negative and positive deflection angles,***,a question arises as to whether the comparison between the calculated nearside(or farside)component and the derived positive-deflection-angle(or negative-deflection-angle)component can help analyze the potential ambiguity *** this study,we conducted a trial application of the envelope method to the potential ambiguity *** envelope method was improved by including uncertainties in the experimental *** colliding systems of 16O+28Si at 215.2 MeV and 12C+12C at 1016 MeV were considered in the *** each colliding system,the angular distribution experimental data were described nearly equally well by two potential sets,one of which is“surface transpar-ent”and the other is *** calculated angular distributions were decomposed into nearside and farside scattering *** the improved envelope method,the experimental data were decomposed into the positive-deflection-angle and negative-deflection-angle components,which were then compared with the calculated nearside and farside *** capability of the envelope method to analyze the potential ambiguities was also discussed.

关键词： Elastic scattering Optical potential ambiguities Envelope method Nearside/farside decomposition

MOTION OF TRACER PARTICLES IN A CENTRIFUGAL PUMP AND ITS TRACKING CHARACTERISTICS

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Journal of Hydrodynamics 2012年第5期24卷 785-793页

作者： LI Ya-lin yuan shou-qi TANG Yue yuan Jian-ping Research Center of Fluid Machinery Engineering and Technology Jiangsu University Zhenjiang 212013 China

The Basset-Boussinesq-Oseen （BBO） equation can be used for most flows to trace the motion of a particle, but in a centrifugal pump, among the forces that act on the particles, one should also include those due to the impeller rotation, as additional effects. This paper firstly reviews various approximations of the BBO equation for the motion of dispersion particles in a viscous fluid. Then based on the motion equation for particles in low Reynolds number centrifugal pumps, a formula for calculating the tracking characteristics of tracer particles is deduced through the Fourier integral transformation. After that the deviations of the particle motion from the fluid motion, as predicted by the various approximations, are discussed and compared. At last, with an emphasis on the Particle Image Velocimetry （PIV） results, the tracking characteristics of particles are estimated. Also, advantages and disadvantages of different tracer particles are discussed and suitable tracer particles for application in PIV studies for flow fields in centrifugal pumps are suggested.

关键词： tracer particles equations of motion tracking characteristics centrifugal pump Particle Image Velocimetry (PIV)

Studies on Non-potentiometric Piezoelectric Sensor System for Determination of Vitamin B_1

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Chemical Research in Chinese Universities 2003年第3期19卷 280-285页

作者： yuan Jin bin NIE Li hua YAO shou zhuo State Key Laboratory of Chemo/Biosensing&Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082P.R.China

A piezoelectric sensor responsive to vitamin B 1 was fabricated based on the vitamin B 1 tetraphenylborate ion pair. The general performance characteristics of the sensor are presented here. The proposed sensor showed a wide working pH range, a good sensitivity and selectivity. The response range is between 1 0×10 -7 -4 9×10 -5 mol/L with a detection limit of 8×10 -8 mol/L at pH 4 0. The selectivity should be attributed to the preferential adsorption of the component ion on the membrane/solution interface. The adsorption behavior of vitamin B 1 on the crystal surface was investigated with a quartz crystal impedance(QCI) system.

关键词： Piezoelectric sensor Vitamin B_(1) Ion-pair complex

Mechanical behaviour of Al/Al_(2)O_(3) composite in pseudo-semi-solid state during isothermal compression

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Transactions of Nonferrous Metals Society of China 2009年第S2期19卷 368-372页

作者： CHENG yuan-sheng LUO shou-jing School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

To gain a better understanding of thixoforging for the Al_(2)O_(3)-37%Al composite,its mechanical behavior in the pseudo-semi-solid state was studied by isothermal compression *** results show that the values of peak stress obviously decrease with increasing temperature and decreasing strain *** compressive true stress-strain curves of the Al_(2)O_(3)-37%Al composite can be divided into four *** are rapidly ascending,decreasing,steady and slowly ***,the main deformation mechanism controlling deformation of the composite in the pseudo-semi-solid state is the sliding or rotary movement between solid particles.

关键词： composite pseudo-semi-solid state mechanical behaviour stress—strain curve

HEF-19-induced relaxation of colonic smooth muscles and the underlying mechanisms

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World Journal of Gastroenterology 2013年第32期19卷 5314-5319页

作者： yuan-yuan Wei Lu-Lu Sun shou-Ting Fu Department of Pharmacy Beijing Shijitan HospitalCapital Medical University School of Life Science and Biopharmaceutics Shenyang Pharmaceutical University

AIM:To investigate the relaxant effect of chromane HEF-19 on colonic smooth muscles isolated from rabbits,and the underlying ***:The relaxant effect and action mechanisms of HEF-19 were investigated using descending colon smooth muscle of the *** 1 cm long were mounted in 15-mL tissue baths containing Tyrode’s solution,maintained at 37±0.5℃and aerated with a mixture of 5%CO2in oxygen(Carbogen).The tension and amplitude of the smooth muscle strips were recorded after adding HEF-19(10-6,10-5and 10-4mol/L).After cumulative administration of four antispasmodic agents,including acetylcholine chloride(Ach)(10-4mol/L),histamine(10-4mol/L),high-K+(60 mmol/L)and BaCl2(8.2 mmol/L),HEF-19(3×10-7-3×10-4mol/L)was added to investigate the relaxant effect of ***2(10-4-2.5×10-3mol/L)was added cumulatively to the smooth muscle preparations pretreated with and without HEF-19(1×10-6or 3×10-6mol/L)and verapamil(1×10-7mol/L)to study the mechanisms ***,phasic contraction was induced with ACh(15×10-6mol/L),and CaCl2(4×10-3mol/L)was added to the smooth muscle preparations pretreated with and without HEF-19(3×10-6mol/L or 1×10-5mol/L)and verapamil(1×10-7mol/L)in calcium-free medium to further study the underlying ***:HEF-19(1×10-6,1×10-5and 1×10-4mol/L)suppressed spontaneous contraction of rabbit colonic smooth ***-19(3×10-7-3×10-4mol/L)relaxed in a concentration-dependent manner colonic smooth muscle preparations pre-contracted with BaCl2,high-K+solution,Ach or histamine with respective EC50values of 5.15±0.05,5.12±0.08,5.58±0.16and 5.25±0.24,thus showing a spasmolytic ***-19(1×10-6mol/L and 3×10-6mol/L)shifted the concentration-response curves of CaCl2to the right and depressed the maximum response to *** two components contracted by Ach were attenuated with HEF-19(3×10-6mol/L or 10-5mol/L)in calcium-free ***:HEF-19 inhibited rabbit colonic smooth muscle contraction,probably through in

关键词： Colonic smooth muscle Smooth muscle relaxation Ca2+channels

Chiral Separation of Ibuprofen and Terbutaline by Nonaqueous Capillary Electrophoresis with Conductance Detection

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Chemical Research in Chinese Universities 2002年第1期18卷 16-19页

作者： DENG Guang-hui WEI shou-lian MO Jin-yuan Department of Chemistry Guangxi University for NationalitiesNanning 530006P.R.China Department of Chemistry Zhongshan UniversityGuangzhou 510275P.R.China

In the nonaqueous N,N -dimethylformamide medium, the chiral drugs ibuprofen and terbutaline were successfully separated with sulfonyl- β -cyclodextrin(s- β -CD) as the chiral selector by capillary electrophoresis with conductance detection. The comparison of the effects of three CDS( β -CD, diethylic- β -CD, sulfonyl- β -CD) on the chiral separation was made and the resolution mechanism was proposed.

关键词： Nonaqueous medium Capillary electrophoresis with conductance detection Sulfonyl β -CD Resolution N,N -Dimethylformamide

Decreasing Trend of Western North Pacific Tropical Cyclone Inner-Core Size over the Past Decades

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Journal of Meteorological Research 2021年第4期35卷 635-645页

作者： Hanrui shou Tim LI yuan SUN Lu WANG Jia LIU Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environmental ChangeNanjing University of Information Science&TechnologyNanjing 210044China International Pacific Research Center and Department of Atmospheric Sciences University of Hawaii at ManoaHonoluluHI96822USA College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China

Studies on tropical cyclone(TC)inner-core size have become increasingly active in recent ***,few studies have investigated the trend of TC inner-core ***,we introduce a new index to measure TC inner-core size and calculate the observed *** index can greatly reduce the influence of data heterogeneity and *** also considers public concern because the new index is mainly determined by the inner-core size of strong TCs,which attract more public attention than weak *** results show that in the past decades,TC inner-core size has a significant downtrend that is significant above the 99%confidence level when the new index is *** also show that this trend is probably related to the increase in TC intensity and relatively small inner-core size of strong ***,relative sea surface temperature(SST)is assumed to make contributions to the downtrend of TC inner-core size,which has a significant negative correlation with the new index.

关键词： tropical cyclone(TC) inner-core size trend intensity

New Thymol Derivate from Centipeda minima

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Chemical Research in Chinese Universities 2009年第1期25卷 125-126页

作者： PU shou-cheng GUO yuan-qiang GAO Wen-yuan ZHANG Tie-jun School of Pharmaceutical Science and Technology Tianjin University Tianjin 300072 P. R. China Department of Pharmaceutical Sciences Nankai University Tianjin 300071 P. R. China Tianjin Institute of Pharmaceutical Research Tianjin 300193 P. R. China

1 Introduction Centipeda minima（Compositae） is an annual herbaceous plant found in moist places throughout the plains mainly in the southern regions of the People＇s Republic of China, Eastern tropical Asia, Australia and the Pacific Islands. It is a commonly used Chinese folk medicine for colds, whooping cough, nasal allergy, malaria and asthma. A number of sesquiterpene lactones, flavonoids and triterpenes have previously been isolated from C. minima. During our study on searching for biological active components from this plant,

关键词： Centipeda minima Thymol derivate Thymohydroquinone 6-O-β-6'-acetyl-Glc