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Slow magnetic relaxation and photoluminescence behaviors of dilanthanide complexes bearing N8O2 donor macrocyclic ligand

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Journal of Rare Earths 2024年第7期42卷 1298-1303页

作者： Pei-Yu liao Yu-quan Qi Zhen Li Jian-Hua Jia Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-Sen University

On account of the complicated magnetic exchange interactions between lanthanide ions,binuclear lanthanide complexes have broad application prospect in the field of single-molecule magnets.Therefore,it is necessary to develop reasonable bridging ligands to manipulate the directional assembly of binuclear lanthanide complexes.Herein,we selected the macrocyclic ligand LN8O2to build up two new dilanthanide complexes [Ln2(LN8O2)（OpyO）2（H2O）2]（NO3）2(1-Ln,Ln=Dy,Tb;LN8O2=hexamethyl-tetraaza-dioxe-dipyrazolacycloicosaphane-2,9,12,19-tetraene;OpyOH=2-pyridinol-1-oxide).Dynamic magnetic studies show that 1-Dy exhibits slow relaxation behavior under a 1 kOe applied field.Further fitting analysis of relaxation times gives the effective energy barrier of 38.2 cm-1,and reveals that the slow magnetic relaxation behavior is dominated by the Orbach and Raman processes.High-resolution luminescence emission spectrum indicates the energy gap of 36.8 cm-1 between the ground state and the first excited state,consistent with the magnetic measurement results.1-Tb exhibits brilliant characteristic green light emission under UV light excitation.The absolute quantum yield of 1-Tb is 44.8%,and its first-order fitted decay lifetime is 779.21 μs at room temperature.This study provides the way for directional construction of high-performance molecular materials with magnetic and optical dualfunction.

关键词： Dilanthanide complexes Macrocyclic ligand Photoluminescence behavior Rare earths Single-molecule magnets

Revealing the Structure-Property Difference of Natural Rubber Prepared by Different Methods: Protein and Gel Content are Key Factors

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Chinese Journal of Polymer Science 2024年第4期42卷 457-467页

作者： Shao-Qi Huang Jun-Qi Zhang Yong Zhu Ling-Min Kong Lu-Sheng liao Fu-quan Zhang Zheng-Tian Xie Jin-Rong Wu State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu610065China Hainan Provincial Key Laboratory of Natural Rubber Processing Agricultural Products Processing Research Institute of Chinese Academy of Tropical Agricultural SciencesZhanjiang524001China

Natural rubber (NR) is widely used in various fields including aerospace, military industry and transportation due to its superior elasticity and comprehensive mechanical properties. Nonetheless, the commercial NR prepared by different methods usually exhibits different mechanical properties, primarily due to variations in processing conditions during the conversion from latex to bulk rubber material. Consequently, this poses challenges in scientific research and industrial production of NR. In order to assess the properties of various commercially available NR and identify key structural and compositional components, this study systematically compares and analyzes four representative NR raw materials: air dried sheet (ADS), ribbed smoked sheets (RSS), constant viscidity NR (CV), and whole field latex rubber (WF). The investigation focuses on evaluating their static mechanical behavior, SIC behavior, wear resistance, and fatigue resistance. The findings indicate that protein and gel content exhibit a crucial influence on the NR properties. These constituents contribute to the formation of a high-crosslinking density region, generating a heterogeneous network structure within the rubber. This structure amplifies strains during deformation, leading to earlier and stronger strain-induced crystallization (SIC). Among the four commercial NR brands, RSS demonstrates superior overall mechanical and dynamic properties owing to its high protein and gel content. This study serves as a valuable reference for comprehending the differences in properties among various commercial NR, thereby offering guidance for the actual processing and selection of NR.

关键词： Natural rubber Processingmethod Protein Gel content Property

Mitochondria-targeted nanoparticles overcome chemoresistance via downregulating BACH1/CD47 axis in ovarian carcinoma

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Chinese Chemical Letters 2024年第5期35卷 344-350页

作者： Ke Gong Jinghan liao Jiangtao Lin quan Wang Zhihua Wu Liting Wang Jiali Zhang Yi Dong Yourong Duan Jianhua Chen State Key Laboratory of Systems Medicine for Cancer Shanghai Cancer InstituteRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200032China Department of Ultrasound Xinhua HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200092China Department of Oncology Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China

The platinum-based chemotherapy is a routine strategy for the treatment of ovarian cancer,while it is prone to chemoresistance in clinical,which hinders the treatment.Therefore,it is urgently needed to elucidate the underlying mechanism of drug resistance and form the appropriate strategy.The sequencing results showed that cisplatin(DDP)resistant ovarian cancer overexpressed BTB and CNC homology 1(BACH1),and up-regulated the“don’t eat me”signal CD47.We identified that hemin,a BACH1 inhibitor,could effectively down-regulate BACH1 and simultaneously inhibit CD47.Moreover,hemin has a synergistic effect with DDP.We designed a pH-responsive nanoparticle(H/D@FA-CaP-NPs)in which folic acid(FA)ensured targeting of ovarian cancer cells,while hemin inhibited BACH1 as well as down-regulated CD47,achieving the promotion of apoptosis of tumor cells and inducing phagocytosis of tumors by macrophages.Moreover,hemin has a synergistic effect with DDP to promote apoptosis of tumor cells.Structurally,hemin and DDP was encapsulated within hydrophobic 1,2-distearoyl-sn-glycero-3-phosphoethanolamine(DSPE)to form a tight core,and hydrophilic polyethylene glycol 2000(PEG2000)and calcium phosphate(CaP)formed the outside shell,and FA was modified on the surface of nanoparticles.In terms of function,(a)FA enhanced the active targeting of nanoparticles to tumors;(b)NPs targeted mitochondria to induce reactive oxygen species(ROS)production;(c)hemin encapsulated in nanoparticles could specifically target BACH1,thereby down regulating CD47;(d)hemin had a synergistic effect with DDP,thus augmenting the chemotherapy.Altogether,mitochondria-targeted nanoparticles H/D@FA-CaP-NPs promoted tumor apoptosis and mobilized phagocytosis to treat tumor,providing a novel scheme for clinical treatment of cisplatin-resistant ovarian carcinoma.

关键词： Cisplatin-resistant Hemin BACH1 CD47 Phagocytosis ROS Synergistic effect

Narrowband blue emitter based on fused nitrogen/carbonyl combination with external quantum efficiency approaching 30%

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Science China Chemistry 2024年第1期67卷 351-359页

作者： Long Chen Jia-Heng Cai You-Jun Yu Yang-Kun Qu Sheng-Yi Yang Sheng-Nan Zou Rui-Hong Liu Dong-Ying Zhou Liang-Sheng liao Zuo-quan Jiang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyMacao 999078China

Multi-resonance thermally activated delayed fluorescence(MR-TADF)emitters can enable narrowband emission with high color purity and electroluminescence efficiency.Nitrogen/carbonyl(N/C=O)system is receiving increasing attention while the nitrogen/boron(N/B)system has been widely studied.Donor decoration is an effective approach for N/B type MR-TADF system but always leads to broadening and red-shifting of the emission band in N/C=O MR-TADF system.We attribute these unfavorable phenomena to the formation of intramolecular charge transfer between the MR-core and peripheral donors.To address this issue,we have developed a new strategy by decorating DMQAO(a fused N/C=O MR-core)with a triazine acceptor and a neutral terphenyl group to construct MTDMQAO and MBDMQAO,respectively.The introduction of the triazine acceptor not only realizes efficient narrowband emission in MTDMQAO,but also accelerates the reverse intersystem crossing process through enhanced spin-orbital coupling.As a result,MTDMQAO exhibits a significantly higher external quantum efficiency of 29.4%compared to the referent emitters,validating the rationality of our derivation strategy.This study highlights the potential of the N/C=O system for MR-TADF emitters and provides important insights for understanding the difference between N/B and N/C=O systems.

关键词： carbonyl group narrowband acceptor decoration thermally activated delayed fluorescence OLEDs

进一步规范原发性甲状旁腺功能亢进症的手术治疗

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西安交通大学学报（医学版） 2024年第1期45卷 9-14页

作者：崔铭廖泉中国医学科学院北京协和医学院北京协和医院基本外科疑难重症及罕见病国家重点实验室北京100730

2022年底,第五届原发性甲状旁腺功能亢进症(PHPT)国际研讨会发布了最新版PHPT诊疗指南。该指南针对PHPT的流行病学、病理生理学、遗传学、临床表型、外科手术及整体患者管理等多个方面进行了系统阐述,并给出了可供临床参考的指南性推荐... 详细信息

2022年底,第五届原发性甲状旁腺功能亢进症(PHPT)国际研讨会发布了最新版PHPT诊疗指南。该指南针对PHPT的流行病学、病理生理学、遗传学、临床表型、外科手术及整体患者管理等多个方面进行了系统阐述,并给出了可供临床参考的指南性推荐意见。本文针对该指南涉及到的PHPT手术治疗相关问题进行探讨,以期进一步提高我国PHPT诊治水平并推动PHPT手术治疗的规范化。

关键词：原发性甲状旁腺功能亢进症甲状旁腺切除术手术治疗

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卒中与酒精使用所致障碍相关性的研究进展

中国卒中杂志 2024年第5期19卷 563-572页

作者：廖佳全凤英重庆医科大学护理学院重庆400016 重庆医科大学附属第一医院护理部重庆医科大学附属第一医院神经内科

酒精使用所致障碍作为全球第五大风险因素,是卒中预防的重要内容。近年来大量流行病学和临床研究显示,酒精使用与卒中之间存在相关性,酒精可通过多种途径影响心脑血管健康,从而引发卒中甚至死亡。同时也有研究显示,酒精使用与卒中之间... 详细信息

酒精使用所致障碍作为全球第五大风险因素,是卒中预防的重要内容。近年来大量流行病学和临床研究显示,酒精使用与卒中之间存在相关性,酒精可通过多种途径影响心脑血管健康,从而引发卒中甚至死亡。同时也有研究显示,酒精使用与卒中之间或许存在不同的关联性,轻度饮酒可能是心脑血管的保护因素,中重度饮酒可能会诱发、加重卒中。本文分析了卒中合并酒精使用所致障碍的流行现状,对酒精使用所致障碍影响卒中发病的可能机制进行综述,同时总结了酒精摄入监测生物标志物和酒精使用所致障碍的治疗方式,以期进一步探讨卒中与酒精使用所致障碍之间的相关性,为临床诊疗提供思路。

关键词：卒中酒精使用所致障碍相关性综述

竖直单U型地埋管换热器埋管间负热阻现象的参数化研究与分析

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太阳能学报 2024年第3期45卷 210-216页

作者：李露茜廖全刘贤燕彭清元重庆大学能源与动力工程学院重庆400044 重庆市地勘局南江水文地质工程地质队重庆401121

基于Mutipole方法对竖直单U型地埋管换热器钻孔内外的耦合传热过程进行求解,在钻孔内三热阻和四热阻简化传热模型基础上,详细地分析钻孔内的复杂稳态传热过程,参数化研究埋管布置结构、回填料与岩土热物性等因素对钻孔内埋管间直接传热... 详细信息

基于Mutipole方法对竖直单U型地埋管换热器钻孔内外的耦合传热过程进行求解,在钻孔内三热阻和四热阻简化传热模型基础上,详细地分析钻孔内的复杂稳态传热过程,参数化研究埋管布置结构、回填料与岩土热物性等因素对钻孔内埋管间直接传热热阻的影响规律,揭示导致钻孔内埋管间负热阻现象的本质原因,对钻孔内热阻传热模型的工程实践应用给出参考意见。

关键词：地源热泵换热器热阻负热阻现象 Multipole法

维普期刊数据库博看期刊

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一种侦干探多功能一体化微系统设计

系统工程与电子技术 2024年第3期46卷 868-881页

作者：肖国尧廖桂生柯华锋李帅全英汇西安电子科技大学电子工程学院陕西西安710071 西安电子科技大学雷达信号处理全国重点实验室陕西西安710071 中国空间技术研究院通信与导航卫星总体部北京100094

在无人机载、弹载综合电子应用领域,基于传统分立器件设计的信号处理系统面临日益突显的资源受限问题。因此,针对无人机载、弹载综合电子系统的多功能、小型化、高性能应用的迫切需求,提出一种侦干探多功能一体化信号处理微系统集成设... 详细信息

在无人机载、弹载综合电子应用领域,基于传统分立器件设计的信号处理系统面临日益突显的资源受限问题。因此,针对无人机载、弹载综合电子系统的多功能、小型化、高性能应用的迫切需求,提出一种侦干探多功能一体化信号处理微系统集成设计技术。基于三维堆叠等先进封装技术,将射频直采数模/模数转换器、可编程逻辑器件、处理器、大容量易失型存储器、非易失性存储器以及阻容等诸多元件进行共封装设计集成,构成可同时完成侦察、干扰、探测功能信号处理的微系统,并构建多功能应用场景,完成软硬件测试验证。该微系统不仅在体积、重量、性能、集成度等方面具有一定优越性,而且大大简化了信号处理系统的复杂电路设计,更便于系统的标准化、通用化和软件化,具有较大的应用前景。

关键词：多功能微系统异质异构三维堆叠侦干探一体化

人工智能在甲状腺及甲状旁腺疾病外科诊疗中的研究进展

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中华普通外科杂志 2024年第1期39卷 30-35页

作者：花苏榕郑淮今廖泉中国医学科学院北京协和医学院、北京协和医院基本外科北京100730

近年来人工智能技术正在赋能各个行业,引领产业升级。人工智能在医学影像分析及外科手术导航定位等方面的进步,正在为整个医学界带来革命性的变化,并正在逐渐渗透进入甲状腺及甲状旁腺疾病的诊疗领域。本文着眼于人工智能在甲状腺及甲... 详细信息

近年来人工智能技术正在赋能各个行业,引领产业升级。人工智能在医学影像分析及外科手术导航定位等方面的进步,正在为整个医学界带来革命性的变化,并正在逐渐渗透进入甲状腺及甲状旁腺疾病的诊疗领域。本文着眼于人工智能在甲状腺及甲状旁腺疾病外科诊疗中的应用,着重阐述基于深度学习的人工智能系统在术前评估、术中辅助决策和预测手术预后等方面的研究和应用进展,并探讨未来的发展前景。

关键词：甲状腺甲状旁腺人工智能