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In situ thermoresponsive supramolecular assembly for switchable circularly polarized luminescence

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Science China Chemistry 2024年第7期67卷 2362-2372页

作者： Menghan Pan Gong Zhang Haotian ma Xiaoxiao Cheng jieai Li Wei Zhang State and Local joint Engineering Laboratory for Novel Functional Polymeric materials Jiangsu Engineering Laboratory of Novel Functional Polymeric MaterialsSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China School of Chemical and Environmental Engineering Anhui Polytechnic UniversityWuhu 241000China

The dynamic regulation of circularly polarized luminescence(CPL)holds profound significance in various fields,such as highlevel information storage and *** we developed a chiral amphiphilic molecule,CPSb-GLU-PEG350(CGP),composed of aggregation-induced emission(AIE)chromophores(Z)-4-(1-cyano-2-phenylvinyl)benzoic acid(CPSb),a chiral linker Glutamic acid and polyethylene glycol(PEG)thermoresponsive *** the self-assembled supramolecular system formed by CGP,we have achieved in-situ temperature-responsive chiral structures,facilitating the thermal control switch of the CPL *** dynamics simulations demonstrate the distinct behaviors of AIE and PEG units during the temperature-variable assembly ***,by co-assembling achiral dye molecules with CGP,we have expanded the color range of the temperature-responsive CPL assembly system in situ and confirmed the occurrence of circularly polarizedF?rster resonance energy transfer(C-FRET)phenomenon in this process,which successfully enriched the strategies for in-situ CPL control in aqueous *** addition,the contactless radiative energy transfer of CPL can also be realized in this system,exhibiting more flexible temperature regulation of the CPL *** study provides a convenient and universal strategy for the construction of dynamically smart chiroptical materials.

关键词： circularly polarized luminescence in-situ thermoresponsive supramolecular assembly energy transfer

A Simple and Effective Surface Defect Detection Method of Power Line Insulators for Difficult Small Objects

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Computers, materials & Continua 2024年第4期79卷 373-390页

作者： Xiao Lu Chengling jiang Zhoujun ma Haitao Li Yuexin Liu State Grid jiangsu Electric Power Co. Ltd.Nanjing210024China State Grid Changzhou Power Supply Company Changzhou213003China

Insulator defect detection plays a vital role in maintaining the secure operation of power *** address the issues of the difficulty of detecting small objects and missing objects due to the small scale,variable scale,and fuzzy edge morphology of insulator defects,we construct an insulator dataset with 1600 samples containing flashovers and *** a simple and effective surface defect detection method of power line insulators for difficult small objects is ***,a high-resolution featuremap is introduced and a small object prediction layer is added so that the model can detect tiny ***,a simplified adaptive spatial feature fusion(saSFF)module is introduced to perform cross-scale spatial fusion to improve adaptability to variable multi-scale ***,we propose an enhanced deformable attention mechanism(EDAM)*** integrating a gating activation function,the model is further inspired to learn a small number of critical sampling points near reference *** the module can improve the perception of object *** experimental results indicate that concerning the dataset of flashover and breakage defects,this method improves the performance of YOLOv5,YOLOv7,and *** practical application,it can simply and effectively improve the precision of power line insulator defect detection and reduce missing detection for difficult small objects.

关键词： Insulator defect detection small object power line deformable attention mechanism

Rational design of new in situ reduction of Ni(II)catalytic system for low-cost and large-scale preparation of porous aromatic frameworks

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Carbon Energy 2024年第5期6卷 105-113页

作者： Shanshan Wang Yue Wu Wenxiang Zhang Hao Ren Guangshan Zhu Heping ma School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'anChina State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchunChina College of Chemistry Northeast Normal UniversityChangchunChina

Porous aromatic framework 1(PAF-1)is an extremely representative nanoporous organic framework owing to its high stability and exceptionally high surface ***,the synthesis of PAF-1 is catalyzed by the Ni(COD)2/COD/bpy system,suffering from great instability and high ***,we developed an in situ reduction of the Ni(II)catalytic system to synthesize PAF-1 in low cost and high *** active Ni(0)species produced from the NiCl_(2)/bpy/NaI/Mg catalyst system can effectively catalyze homocoupling of tetrakis(4-bromophenyl)methane at the room temperature to form PAF-1 with high brunauer-Emmett-Teller(bET)-specific surface area up to 4948 m^(2) g^(−1)(Langmuir surface area,6785 m2 g−1).The possible halogen exchange and dehalogenation coupling mechanisms for this new catalytic process in PAF's synthesis are discussed in *** efficiency and universality of this innovative catalyst system have also been demonstrated in other PAFs'*** work provides a cheap,facile,and efficient method for scalable synthesis of PAFs and explores their application for high-pressure storage of Xe and Kr.

关键词： adsorption carbon material nickel catalysis porous aromatic framework porous organic polymer

Grating-free autofocus for single-pixel microscopic imaging

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Photonics Research 2024年第6期12卷 1313-1321页

作者： GUAN WANG HUAXIA DENG YU CAI MENGCHAO ma XIANG ZHONG XINGLONG GONG CAS Key Laboratory of Mechanical behavior and Design of materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China School of Instrument Science and Opto-electronics Engineering Hefei University of TechnologyHefei 230009China

As a computational technology,single-pixel microscopic imaging(SPMI)transfers the target’s spatial information into a temporal *** traditional focusing method of imaging before evaluation is not applicable to the SPMI *** propose a grating-free autofocus strategy derived from the physical mechanism of optical *** the amplitude information of just one high-frequency point in the spectrum is all that is needed to achieve fast autofocus with the SPMI ***,only four patterns need to be cyclically projected,enabling efficient localization of the focal plane based on the measurement *** demonstrate SPMI autofocus experiments at micrometer and even nanometer depths of *** proposed method can be extended to achieve SMPI autofocus with invisible optical pattern illumination.

关键词： optical system illumination

The rise of supercapacitor diodes:Current progresses and future challenges

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Chinese Physics b 2024年第2期33卷 10-20页

作者：马鸿云马凌霄毕华盛兰伟 School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China School of materials and Energy Lanzhou UniversityLanzhou 730000China

Supercapacitor has been widely known as a representative electrochemical energy storage device with high power density and long ***,with the deeper understanding of its charge storage mechanism,unidirectional-charging supercapacitor,also called supercapacitor diode(CAPode),is successfully developed based on the ion-sieving effect of its working electrode towards electrolyte *** CAPode integrates mobile ion and mobile electron in one hybrid circuit,it has a great potential in the emerging fields of ion/electron coupling logic operations,human–machine interface,neural network interaction,and in vivo diagnosis and ***,we herein elucidate the working mechanism and design philosophy of CAPode,and summarize the electrode materials that are suitable for constructing ***,some other supercapacitor-based devices beyond CAPode are also introduced,and their potential applications are instructively ***,we outline the challenges and chances of CAPode-related techniques.

关键词： supercapacitor diode ion-sieving effect ion/electron coupling circuit logic operation

Single-cell transcriptomic landscape of peripheral blood cells provides insights into adaptation of red-eared sliders(Trachemys scripta elegans)

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Integrative Zoology 2024年第3期19卷 468-479页

作者： Rui GUO Guangwei ma Xiaofei ZHAI Haitao SHI jichao WANG Ministry of Education Key Laboratory for Ecology of Tropical Islands Key Laboratory of Tropical Animal and Plant Ecology of Hainan ProvinceCollege of Life SciencesHainan Normal UniversityHaikouChina

Red-eared sliders(Trachemys scripta elegans),as one of the 100 most threatening aliens,have stronger immunity than the native species in response to environmental *** cells are an important component of immunity in the ***,the blood cell researches of turtle are still in the traditional blood cell classification and morphological structure ***,turtle granulocytes cannot be accurately identified using traditional ***-cell RNA sequencing techniques have been successfully implemented to study cells based on the mRNA expression patterns of each *** present study profiled the transcriptomes of peripheral blood cells in red-eared sliders to construct a single-cell transcriptional landscape of the different cell types and explored environmental adaptation mechanism from the perspective of *** 14 transcriptionally distinct clusters(platelets,erythrocytes1,erythrocytes2,CSF1R monocytes,POF1b monocytes,neutrophils,GATA2high basophils,GATA2low basophils,CD4 T cells,CD7 T cells,b cells,ACKR4 cells,serotriflin cells,and ficolin cells)were identified in the peripheral blood cells of the red-eared *** particular,a subtype of erythrocytes(erythrocytes1)that expressed immune signals was *** blood cells were grouped into three lineages:platelet,erythroid/lymphoid,and myeloid cell ***,based on differentiation trajectory and up-regulated gene expression,ACKR4 cells were newly identified as lymphocytes,and serotriflin and ficolin cells as *** single-cell transcriptional atlas of the peripheral blood cells in red-eared sliders provided in the present study will offer a comprehensive transcriptome reference for the exploration of physiological and pathological hematology in this species.

关键词： blood cells single-cell RNA-seq Trachemys scripta elegans

A model for aircraft cabin evacuation considering passenger type

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journal of safety Science and Resilience 2024年第1期5卷 83-90页

作者： Yaping ma jinfeng Yuan Lingling Tan Quanyi Liu Mengling Li Civil Aircraft Fire Science and safety Engineering Key Laboratory of Sichuan Province Civil Aviation Flight University of ChinaGuanghan 618307China School of safety Science and Emergency management Wuhan University of TechnologyWuhan 430070China

Pedestrian safety evacuation in aircraft cabins has been a challenging problem because of the aircraft’s unique characteristics,such as the diversity of passengers and the restricted evacuation *** is difficult to reproduce evacuation activities in aircraft cabin due to safety concerns and cost *** fill this gap,an improved cellular automaton model of crowd evacuation for aircraft cabin is established by incorporating the characteristics of cabin space structures and passenger *** are divided into healthy individual passengers and disabled-healthy group passengers,whose movement mechanisms are *** on the constructed model,simulation experiments are conducted using the configuration cabin layout of b737-800 as an *** results show that the evacuation time is prolonged with increased passenger density and the number of disabled ***,the overall evacuation time is insignificantly affected by whether disabled-healthy group passengers’seats are close to the aisle or window,and the evacuation efficiency is best when their seats are evenly distributed in the *** evacuation time is the shortest when all cabin doors are open,and pedestrians are evacuated the slowest when the central emergency doors are *** study pro-vides valuable insights into effective strategies for pedestrian evacuation and crowd emergency management of civil aircraft.

关键词： Aircraft cabin evacuation Passenger type Cellular automaton model Pedestrian distribution Evacuation efficiency

Effect of annealing temperature on magnetic properties of a sintered Nd-Fe-b magnet after grain boundary diffusion with Dy_(70)Cu_(30) alloy

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journal of Rare Earths 2024年第1期42卷 116-120,I0004页

作者： Ruipeng Qian Yuxuan ma Fugang Chen Hui Sun Yong Zhao Yunlong Chen School of materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003China School of Energy and Power Engineering Jiangsu University of Science and TechnologyZhenjiang212003China

Grain boundary diffusion process(GbDP)has been developed as an effective approach to increase the coercivity of sintered Nd-Fe-b magnets by regulating the compositions and phase distributions near grain *** work aims to explore how to select the optimum annealing temperature after *** this work GbDP was performed on a sintered Nd-Fe-b magnet using Dy_(70)Cu_(30) *** GbDP the low eutectic temperature of the grain boundary phases decreases from the initial 492 to 451℃.The magnetic property dependent on different annealing temperatures near the low eutectic temperature was *** magnetic properties,especially the squareness factor of demagnetization curve show a strong dependence on the annealing *** GbDP the optimal magnetic properties can be obtained after annealing just above the low eutectic temperature of the grain boundary *** mechanism is discussed based on the microstructure analysis.

关键词： Nd-Fe-b magnet Grain boundary diffusion Annealing Dy_(70)Cu_(30)alloy Rare earths

Generalized Hopf bifurcation in a Delay Model of Neutrophil Cells Model

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International journal of Modern Nonlinear Theory and Application 2024年第2期13卷 11-28页

作者： Suqi ma S. j. Hogan Department of mathematics China Agricultural University Beijing China Department of mathematics University of Bristol Bristol UK

The DDE-biftool software is applied to solve the dynamical stability and bifurcation problem of the neutrophil cells model. based on Hopf point finding with the stability property of the equilibrium solution loss, the continuation of the bifurcating periodical solution starting from Hopf point is exploited. The generalized Hopf point is tracked by seeking for the critical value of free parameter of the switching phenomena of the open loop, which describes the lineup of bifurcating periodical solutions from Hopf point. The normal form near the generalized Hopf point is computed by Lyapunov-Schimdt reduction scheme combined with the center manifold analytical technique. The near dynamics is classified by geometrically different topological phase portraits.

关键词： Generalized Hopf bifurcation DDE-biftool Software Norm Form