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Heterobimetallic lanthanide tetrahedral cages:Synthesis,design and application for potential multimodal imaging contrast agent

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Journal of Rare Earths 2024年第2期42卷 278-285,I0002页

作者： Yongxiu li Feng Guo Siwei Wei Duofu li Jun Zhang Kai xu Dongping li Department of Chemistry Nanchang UniversityNanchang330031China Key Laboratory of Functional Molecule Design and Interface Process Anhui Jianzhu UniversityHefei230601China Department of Otolaryngology Head and Neck SurgeryThe Second Affiliated Hospital of Nanchang UniversityNanchang330006China

The construction and functionalization of lanthanide-organic cages have been a research hotspot in coordination *** from the unique luminescent and magnetic properties of lanthanide ions,the potential applications of lanthanide-organic cages in biological imaging applications are promising,but only a few corresponding explorations have been *** rein,we introduced a series of lanthanide tetrahedral cages,(Eu_(n)Gd_(4-n)L_(4))(sol)_8(n=0,1,2,3 and 4,where L=(4,4',4"-tris(4,4,4-trifluoro-1,3-dioxobutyl)-triphenylamine,and sol=dimethyl sulfoxide and methanol),with potential applications in biological *** the good luminescent and magnetic properties of Eu^(3+) and Gd^(3+) ions,Eu_(4)L_(4) and Gd_(4)L_(4) complexes show a high luminescence quantum yield of 29% in DMSO and large longitudinal relaxivity(r_(1)) of 11.4(mmol/L)^(-1)/s at 0.5 T in water containing 1 vol% DMSO,*** heterobimetallic Eu-Gd complexes achieve a dual imaging mode by combining luminescent and magnetic centers in one *** the Gd:Eu ratio increases from 1:3 to 3:1,the r_(1) values increases from 5.33 to 8.64(mmoI/L)^(-1)/s,higher than that of commercial contrast agent Gd-DOTA(3.23(mmol/L)^(-1)/s).Owing to their low toxicity and good cell imaging ability toward ECA 109 cells,the selfassembled Eu-Gd heterobimetallic tetrahedral cages could be potential candidates for the multimodal imaging contrast agent.

关键词： Lanthanide organic cage Luminescence Cell imaging Contrast agents Rare earths

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Multipartite oil-flower/oil-bee mutualisms involving male-bee-pollinated orchids in tropical Asia

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National Science Review 2024年第05期11卷 105-107页

作者： Meng Zhang li-Bing Jia Susanne S.Renner Zhi-Xi Tian Xiao-An Wang Jiang-Yun Gao Yi-bo Luo Antonio J.C.Aguiar Huan-li xu Shuang-Quan Huang Institute of Evolution and Ecology School of Life Sciences Central China Normal University Department of Biology Washington University State Key Laboratory for Conservation and Utilization of Bio-resources in Yunnan Yunnan University State Key Laboratory of Systematic and Evolutionary botany Institute of Botany Chinese Academy of Sciences Department of Zoology University of Brasília Department of Entomology College of Plant Protection China Agricultural University

Most animal-pollinated flowers offer nectar or pollen as a reward to their pollinators. A small fraction, however, have switched to other rewards, such as fatty oils offered in glandular hairs or just below the epidermis. This type of reward has evolved in some 150 genera in at least 11 families, including South American and African Orchidaceae [1,2]. Oiloffering flowers are exploited by a few hundred species of oil-collecting bees in temperate and tropical biomes on all continents except Antarctica [1,2]. Oil bees depend obligatorily on floral oil for cell lining and as larval food [3,4], which is why oil collecting usually is confined to female bees.

关键词： CTENOPLECTRINI HYMENOPTERA DENDROBIUM APIDAE

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Thyristor-inserted MMC Sub-module Topology with DC Fault Blocking Capability

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2221-2229页

作者： Cheng Peng Rui li xu Cai Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong UniversityMinistry of EducationShanghai Jiao Tong UniversityShanghai 200240China.

Modular multilevel converter(MMC)is increasingly being applied to high voltage direct current(HVDC)***,dc short circuit situations restrain the application of a conventional half bridge MMC *** this paper,a new sub-module topology with inserted thyristor can help the MMC system clear a dc side *** states and devices voltage stress of the proposed topology are analyzed and the conduction loss comparison between the proposed topology with several existing topologies with dc fault blocking capability is carried *** show the proposed topology is superior to other topologies in terms of conduction loss while using the same voltage rating ***,compared with traditional half bridge topology,only thyristors and diodes are added in the proposed ***,cost of the proposed topology can be lower than conventional hybrid MMC *** last,the fault blocking capability of the proposed topology is verified in the simulation.

关键词： Fault current limiting high voltage direct current(HVDC)transmission modular multilevel converter(MMC)

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Recent advances in multi-metallic-based nanozymes for enhanced catalytic cancer therapy

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BMEMat(BioMedical Engineering Materials) 2024年第1期2卷 30-48页

作者： Mingjin Cui bo xu lianhui Wang Key Laboratory for Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)School of Chemistry and Life SciencesNanjing University of Posts and TelecommunicationsNanjingChina

Nanozymes have emerged as a promising alternative to natural enzymes,effectively addressing natural enzymes'inherent *** and potential applications of nanozyme span across various fields,with catalytic tumor therapy being one prominent *** has sparked significant interest and exploration in the utilization of nanozymes for targeted cancer *** advancements in interdisciplinary research,nanotechnology,biotechnology,and catalytic technology have led to the emergence of multi-metallicbased nanozymes,which exhibit tremendous potential for further *** review focuses on investigating the synergistic effects of multimetallicbased nanozymes,aiming to enhance our understanding of their catalytic activities and facilitate their broader *** comprehensively survey the remarkable achievements in the synthesis,catalytic mechanisms,and the latest applications of multi-metallic-based nanozymes in cancer catalytic ***,we identify the current limitations and prospects of multi-metallic-based nanozymes in the development of new materials and the application of novel technologies,along with the potential challenges associated with catalytic cancer *** review underscores the significance of multi-metallic-based nanozymes and emphasizes the need for continued exploration as well as their potential impact on the development of novel materials and the realization of breakthroughs in catalytic tumor therapy.

关键词： cancer therapy multi-metallic nanomaterials nanozyme activities synergistic effects

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中国共产党以马克思主义主流话语引领社会变革探析

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毛泽东邓小平理论研究 2021年第8期 63-70,108页

作者：徐立波上海师范大学马克思主义学院上海师范大学21世纪马克思主义研究中心

马克思主义话语中国化的过程,是一个建构话语体系、树立话语权威、掌握话语主动权的过程。百年来,中国共产党紧跟时代发展潮流,不断实现马克思主义话语的创新发展,形成了马克思主义中国化的话语谱系。在中国共产党成立100周年之际,对中... 详细信息

马克思主义话语中国化的过程,是一个建构话语体系、树立话语权威、掌握话语主动权的过程。百年来,中国共产党紧跟时代发展潮流,不断实现马克思主义话语的创新发展,形成了马克思主义中国化的话语谱系。在中国共产党成立100周年之际,对中国共产党不同历史时期马克思主义主流话语的形成与发展历程展开研究,探析中国共产党在不同历史时期以马克思主义主流话语引领社会变革的主要历程和基本经验,对新时代中国特色社会主义话语体系的建构完善具有重要意义。

关键词：中国共产党马克思主义话语变革

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Plasma-etching on monolithic MOFs-based MIM filter boosted chemical sensing

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Nano Research 2024年第4期17卷 2800-2807页

作者： Jianxi liu li Feng Zhihuan li Yang Wu Feng Zhou Yadong xu Research&Development Institute Northwestern Polytechnical University in ShenzhenShenzhen 518057China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Shandong Laboratory of Advanced Materials and Green Manufacturing at YantaiYantai 264006China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Metal-insulator-metal(MIM)cavity as a lithography-free structure to control light transmission and reflection has great potential in the field of optical ***,the dense top metal layer of the MIM prohibits any external medium from entering the dielectric insulation layer,which limits the application of the cavity in the sensing ***,we demonstrate a series of monolithic metal-organic frameworks(MOFs)based MIM cavities,which are treated by plasma etching to provide channels for chemical diffusion and to advance *** modulate the bandwidth of the MIM filters by controlling the MOF thickness as insulator *** plasma-etching is applied to build channels on the top metal layer without altering their saturation and brightness for chemical sensing *** etching time regulates the number and size of channels on the top metal *** behavior is demonstrated on the plasma-etched MOFs-based MIM cavity when external chemicals diffuse in the *** addition,we generate patterned structure of the MOFs-based MIM cavity via plasma-mask method,which can transfer to different substrates and produce a controllable structure color change for chemical *** MIM cavity may promote the advancement and applications of structural color in security imaging,color display,information anticounterfeiting,and color printing.

关键词： metal-organic frameworks(MOFs) spin-coating metal-insulator-metal filter patterns sensing

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Effect of proppant sizes and injection modes on proppant transportation and distribution in the tortuous fracture model

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Particuology 2024年第1期84卷 261-280页

作者： Jun li xu Han Siyuan He Mingyi Wu Xin Huang Nianyin li State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Chongqing Industry Polytechnic College Chongqing401120China Sichuan Particles Energy and Technology Co. LtdChengdu611630China Engineering Technology Research Institute of PetroChina Southwest Oil and Gas Field Company Chengdu610017China

Particle-fluid transport and placement mechanism in tortuous fracture played a crucial role in uncon-ventional ***,most studies focused on mono-size proppant with fluid transport pro-cesses in tortuous ***,the mixture-size proppant with fluid movement mechanism in tortuous fracture was still ***,this study designed and applied a series of experiments with a physical analog model of a tortuous fracture with 120°and 90°-angled bends and combined high-speed camera-based *** experimental system was used to track different-mixture-sized proppant particle motion trajectories for a series of proppant injection schemes;The following conclu-sions were drawn from this study:*** pile-up processes mechanism in all investigated schemes were similar and could be reduced to four main *** packing structure at both sides of the fracture wall had different variation rates,which were controlled by the mix ratio(change from 1∶1-1∶5)of proppant *** new packing patterns,such as Zebra Stripe,had occurred,controlled by the different proppant injection ***-sized mono-proppant(30/50 mesh)had the highest transport efficiency in the tortuous fracture,followed by the mixed-sized multi-proppant(10/20 mesh:30/50 mesh),large-sized proppant(10/20 mesh)was the *** optimized alternating in-jection mode was recommended as injecting small-sized proppant first(30/50 mesh)and followed by mixed-sized multi-proppant(10/20 mesh:30/50 mesh),which could contribute to obtaining the optimal both proppant packing height and travel distance in tortuous *** correlations were devel-oped for predicting the proppant packing height and transportation distance.

关键词： Tortuous fracture model Mixed-sized proppant Multi-sized proppant injection mode Proppant motion and distribution Packing mechanism

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Investigation on mechanical properties regulation of rock-like specimens based on 3D printing and similarity quantification

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International Journal of Mining Science and Technology 2024年第5期34卷 573-585页

作者： Duanyang Zhuang Zexu Ning Yunmin Chen Jinlong li Qingdong li Wenjie xu Center for Hypergravity Experiment and Interdisciplinary Research Zhejiang UniversityHangzhou 310058China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China

3D printing is widely adopted to quickly produce rock mass models with complex structures in batches,improving the consistency and repeatability of physical *** is necessary to regulate the mechanical properties of 3D-printed specimens to make them proportionally similar to natural *** study investigates mechanical properties of 3D-printed rock analogues prepared by furan resin-bonded silica sand *** mechanical property regulation of 3D-printed specimens is realized through quantifying its similarity to sandstone,so that analogous deformation characteristics and failure mode are *** similarity conversion,uniaxial compressive strength,cohesion and stress–strain relationship curve of 3D-printed specimen are similar to those of *** the study ranges,the strength of 3D-printed specimen is positively correlated with the additive content,negatively correlated with the sand particle size,and first increases then decreases with the increase of curing *** regulation scheme with optimal similarity quantification index,that is the sand type of 70/140,additive content of 2.5‰and curing temperature of 81.6℃,is determined for preparing 3D-printed sandstone analogues and *** effectiveness of mechanical property regulation is proved through uniaxial compression contrast *** study provides a reference for preparing rock-like specimens and engineering models using 3D printing technology.

关键词： 3D printing Mechanical property regulation Similarity quantification Rock analogue Sandstone

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Remote ischemic conditioning prevents ischemic cerebrovascular events in children with moyamoya disease:a randomized controlled trial

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World Journal of Pediatrics 2024年第9期20卷 925-934页

作者： Shuang-Feng Huang Jia-li xu Chang-Hong Ren Nathan Sim Cong Han Yi-Qin Han Wen-bo Zhao Yu-Chuan Ding xun-Ming Ji Si-Jie li Department of Neurology Xuanwu HospitalCapital Medical UniversityNo 45Changchun StreetXicheng DistrictBeijing100053China Department of Rehabilitation Medicine Beijing Shijitan Hospital Affiliated to Capital Medical UniversityBeijingChina Beijing Institute of Brain Disorders Capital Medical UniversityNo.10XitoutiaoYou’anmenwaiFengtai DistrictBeijing100053China Beijing Key Laboratory of Hypoxic Conditioning Translational Medicine Xuanwu HospitalCapital Medical UniversityBeijingChina Department of Neurosurgery Wayne State UniversityDetroitMIUSA Department of Neurosurgery The Fifth Medical CentreChinese PLA General HospitalBeijingChina Department of Emergency Xuanwu HospitalCapital Medical UniversityBeijingChina

Background Moyamoya disease(MMD)is a significant cause of childhood stroke and transient ischemic attacks(TIAs).This study aimed to assess the safety and efficacy of remote ischemic conditioning(RIC)in children with *** In a single-center pilot study,46 MMD patients aged 4 to 14 years,with no history of reconstructive surgery,were randomly assigned to receive either RIC or sham RIC treatment twice daily for a *** primary outcome measured was the cumulative incidence of major adverse cerebrovascular events(MACEs).Secondary outcomes included ischemic stroke,recurrent TIA,hemorrhagic stroke,revascularization rates,and clinical improvement assessed using the patient global impression of change(PGIC)scale during ***-related adverse events were also recorded,and cerebral hemodynamics were evaluated using transcranial *** All 46 patients completed the final follow-up(23 each in the RIC and sham RIC groups).No severe adverse events associated with RIC were ***-Meier analysis indicated a significant reduction in MACEs frequency after RIC treatment[log-rank test(Mantel-Cox),P=0.021].At 3-year follow-up,two(4.35%)patients had an ischemic stroke,four(8.70%)experienced TIAs,and two(4.35%)underwent revascularization as the qualifying *** clinical improvement rate in the RIC group was higher than the sham RIC group on the PGIC scale(65.2%vs.26.1%,P<0.01).No statistical difference in cerebral hemodynamics post-treatment was *** RIC is a safe and effective adjunct therapy for asymptomatic children with *** was largely due to the reduced incidence of ischemic cerebrovascular events.

关键词： Asymptomatic moyamoya disease Children Remote ischemic conditioning Stroke

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Parking choice behaviour analysis of rural residents based on the latent variable random forest model

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Transportation Safety and Environment 2024年第3期6卷 167-180页

作者： Minqing Zhu bo Zhao Hongjun Cui Sheng Yao Feng xu School of Architecture and Art Design Hebei University of TechnologyTianjin 300130China School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China

The imbalance of rural parking supply and demand has a great impact on traffic congestion and environmental pollution,which has attracted the attention of many scholars as well as ***,most of the current research on parking choice focuses on urban business and residential areas rather than on rural parking choice behaviour,and focuses on the analysis of observable factors,ignoring the internal relationship with potential *** study considers the heterogeneity of individuals and uses the random forest(RF)algorithm to construct a model of rural residents’willingness to choose parking with both latent and explicit variables,to explore how much and in what ways individual characteristics and parking characteristics affect rural residents’parking choices,and to explore parking planning programmes and strategies that are truly applicable to rural *** results of the study suggest that the safety and convenience of the parking environment are key factors influencing the parking choice behaviour of rural residents,and can greatly improve the predictive accuracy of the parking willingness *** comparison,it is found that the application of the RF algorithm is also significantly better than the logit model in terms of prediction effect,indicating that there is a nonlinear effect among the factors influencing the parking choice behaviour of rural residents and that the RF model with the addition of latent variables provides a better explanatory ability for the study of the parking choice behaviour of rural residents.

关键词： rural residents parking choice random forest(RF) latent variable SEM-RF model

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