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5.0T全脑准连续动脉自旋标记MRI参数优化

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中国医学影像技术 2024年第5期40卷 643-647页

作者：李冬雪范晓媛韩华璐陈硕孙伟有慧李明利冯逢中国医学科学院北京协和医学院北京协和医院协和转化医学中心放射科北京100730 上海联影医疗科技股份有限公司上海201807

目的探讨5.0T全脑准连续动脉自旋标记(pCASL)MRI参数优化。方法前瞻性招募9名健康成人,利用5.0T MR仪行单延迟pCASL扫描,设置3组标记梯度:A组,平均梯度(G_(avg))=1 mT/m,最大梯度(G_(max))与G_(avg)比值(G_(ratio))=10;B组,G_(avg)=0.6 mT/m,G_(ratio)=10;C组,G_(avg)=0.3 mT/m,G_(ratio)=9。比较3组标记效率及脑血流量(CBF);筛选最佳标记梯度组。结果标记血流平均速度为40 cm/s、B1+降低和B0偏移频率较大时,C组梯度场容纳度优于A、B组。C组梯度场下,标记动脉B1水平为54.19%~75.36%、平均64.71%;该组标记效率均≥85%平均B1水平(64.71%)下标记效率均≥90%。C组梯度场下pCASL采集的全脑灰质和几乎所有脑区的CBF明显高于A、B组(P均<0.05)。结论低G_(avg)及低G_(max)为5.0T全脑pCASL MRI最佳参数。

关键词：脑动脉自旋标记磁共振成像图像质量前瞻性研究

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5.0T MRI辅助诊断促肾上腺皮质激素微腺瘤1例

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中国医学影像技术 2024年第5期40卷 703-704页

作者：岳志领范晓媛刘泽宇韩华璐陈硕杨于昕有慧冯逢邯郸市中心医院CT/MRI室河北邯郸056000 中国医学科学院北京协和医学院北京协和医院放射科北京100730 上海联影医疗科技股份有限公司上海201807 北京联影智能影像技术研究院北京100094

患者,女,44岁,发现“面部变圆”4年,近2年体质量增加16 kg;既往体健。查体:满月脸,皮肤菲薄,向心性肥胖,双侧锁骨上脂肪垫,水牛背,腹部紫纹,双下肢中度凹陷性水肿。实验室检查:血皮质醇昼夜节律消失,24 h尿游离皮质醇691.1μg/dl,促肾... 详细信息

患者,女,44岁,发现“面部变圆”4年,近2年体质量增加16 kg;既往体健。查体:满月脸,皮肤菲薄,向心性肥胖,双侧锁骨上脂肪垫,水牛背,腹部紫纹,双下肢中度凹陷性水肿。实验室检查:血皮质醇昼夜节律消失,24 h尿游离皮质醇691.1μg/dl,促肾上腺皮质激素(adrenocorticotropic hormone,ACTH)48.0 pg/ml.

关键词：促肾上腺皮质激素腺瘤磁共振成像

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县域医共体提升基层医疗卫生机构服务能力的研究

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卫生经济研究 2024年第5期41卷 77-80页

作者：楼英婷刘凯捷范晓苑郑琪仪麦热依·巴合提董恒进浙江大学医学院附属第四医院浙江大学国际健康医学研究院浙江义乌322000 浙江大学公卫学院社会医学系医学部卫生政策学研究中心浙江杭州310058

目的:分析浙江省县域医共体建设对提升基层医疗卫生机构服务能力的作用及机制,为进一步深化县域医共体改革提供政策建议。方法:通过定量分析和定性访谈,收集并分析基层医疗卫生机构在县域医共体建设前后的各项服务能力指标。结果:实施... 详细信息

目的:分析浙江省县域医共体建设对提升基层医疗卫生机构服务能力的作用及机制,为进一步深化县域医共体改革提供政策建议。方法:通过定量分析和定性访谈,收集并分析基层医疗卫生机构在县域医共体建设前后的各项服务能力指标。结果:实施县域医共体建设后,样本卫生院整体服务能力的平均合格率、平均优秀率分别提升了17.72、21.10个百分点,功能任务和资源配置、基本医疗和公共卫生服务、业务管理和综合管理方面的指标得分也得到提高。结论:县域医共体建设提升了基层医疗卫生机构的整体服务能力,但仍需进一步完善体制机制建设,促进县域医共体和基层医疗卫生机构的高质量发展。

关键词：县域医共体基层医疗卫生机构服务能力

Wet-milling synthesis of immobilized Pt/Ir nanoclusters as promising heterogeneous catalysts

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Nano Research 2022年第4期15卷 3065-3072页

作者： Peng Du Kai Huang xiaoyuan fan Jingteng Ma Naveed Hussain Ruyue Wang Bohan Deng Binghui Ge Haolin Tang Ru Zhang Ming Lei Hui Wu State Key Laboratory of Information Photonics and Optical Communications&School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Being a typical state of the art heterogeneous catalyst,supported noble metal catalyst often demonstrates enhanced catalytic ***,a facile synthetic method for realizing large-scale and low-cost supported noble metal catalyst is strictly *** this end,by making use of the strong metal-support interaction(SMSI)and mechanochemical reaction,we introduce an efficient synthetic route to obtain ultrafine Pt and Ir nanoclusters immobilized on diverse substrates by wet chemical *** further demonstrate the scaling-up effect of our approach by large-scale ball-milling production of Pt nanoclusters immobilized on TiO_(2)*** synthesized Pt/Ir@Co_(3)O_(4)catalysts exhibit superior oxygen evolution reaction(OER)performance with only 230 and 290 mV overpotential to achieve current density of 10 and 100 mA·cm^(-2),beating the catalytic performance of Co_(3)O_(4)supported Pt or Ir clusters and commercial Ir/*** is envisioned that the present work strategically directs facile ways for fabricating supported noble metal heterogeneous catalysts.

关键词： heterogeneous catalysts metal clusters wet milling large-scale production strong metal–support interaction

Miniature tunable Airy beam optical meta-device

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Opto-Electronic Advances 2024年第2期7卷 5-12页

作者： Jing Cheng Zhang Mu Ku Chen Yubin fan Qinmiao Chen Shufan Chen Jin Yao xiaoyuan Liu Shumin Xiao Din Ping Tsai Department of Electrical Engineering City University of Hong KongKowloonHong Kong SAR 999077China State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SAR 999077China Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongKowloonHong Kong SAR 999077China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of TechnologyShenzhen 518055China

Tunable Airy beams with controllable propagation trajectories have sparked interest in various fields,such as optical manipulation and laser *** research approaches encounter challenges related to insufficient compactness and integration feasibility,or they require enhanced tunability to enable real-time dynamic manipulation of the propagation *** this work,we present a novel method that utilizes a dual metasurface system to surpass these limitations,significantly enhancing the practical potential of the Airy *** approach involves encoding a cubic phase profile and two off-axis Fresnel lens phase profiles across the two *** validity of the proposed strategy has been confirmed through simulation and experimental *** proposed meta-device addresses the existing limitations and lays the foundation for broadening the applicability of Airy beams across diverse domains,encompassing light-sheet microscopy,laser fabrication,optical tweezers,etc.

关键词： metasurface miniature device tunable Airy beam tunable meta-device

A review of solid-state lithium metal batteries through in-situ solidification

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Science China Chemistry 2024年第1期67卷 67-86页

作者： Pan Xu Zong-Yao Shuang Chen-Zi Zhao Xue Li Li-Zhen fan Aibing Chen Haoting Chen Elena Kuzmina Elena Karaseva Vladimir Kolosnitsyn xiaoyuan Zeng Peng Dong Yingjie Zhang Mingpei Wang Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018China Ordos Carbon Neutral Research and Application Co. Ltd.Ordos City 017010China Ufa Institute of Chemistry UFRC RAS Ufa 450054Russia Institute for Carbon Neutrality Tsinghua UniversityBeijing 100084China Shanxi Research Institute for Clean Energy Tsinghua UniversityTaiyuan 030032China

High-energy-density lithium metal batteries are the next-generation battery systems of choice,and replacing the flammable liquid electrolyte with a polymer solid-state electrolyte is a prominent conduct towards realizing the goal of high-safety and high-specific-energy ***,the inherent intractable problems of poor solid-solid contacts between the electrode/electrolyte and the growth of Li dendrites hinder their practical *** in-situ solidification has demonstrated a variety of advantages in the application of polymer electrolytes and artificial interphase,including the design of integrated polymer electrolytes and asymmetric polymer electrolytes to enhance the compatibility of solid–solid contact and compatibility between various electrolytes,and the construction of artificial interphase between the Li anode and cathode to suppress the formation of Li dendrites and to enhance the high-voltage stability of polymer *** review firstly elaborates the history of in-situ solidification for solid-state batteries,and then focuses on the synthetic methods of solidified ***,the recent progress of in-situ solidification technology from both the design of polymer electrolytes and the construction of artificial interphase is summarized,and the importance of in-situ solidification technology in enhancing safety is ***,prospects,emerging challenges,and practical applications of in-situ solidification are envisioned.

关键词： in-situ solidification polymer electrolyte artificial solid electrolyte interphase rechargeable lithium metal batteries dendrite-free lithium metal anode

Identification and characterization of human hematopoietic mesoderm

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Science China(Life Sciences) 2024年第2期67卷 320-331页

作者： Yuqi Wen Jingjing Zhao Runqing Zhang fan Liu xiaoyuan Chen Dan Wu Mengge Wang Cuicui Liu Pei Su Panpan Meng Yiyue Zhang Xin Gao Lu Wang Hongtao Wang Jiaxi Zhou State Key Laboratory of Experimental Hematology National Clinical Research Center for Blood DiseasesHaihe Laboratory of Cell EcosystemInstitute of Hematology&Blood Diseases HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300020China Tianjin Institutes of Health Science Tianjin 301600China CAMS Center for Stem Cell Medicine PUMC Department of Stem Cell and Regenerative MedicineTianjin 300020China Division of Cell Developmental and Integrative BiologySchool of MedicineSouth China University of TechnologyGuangzhou 510006China

The embryonic mesoderm comprises heterogeneous cell subpopulations with distinct lineage *** is unclear whether a bias for the human hematopoietic lineage emerges at this early developmental *** this study,we integrated single-cell transcriptomic analyses of human mesoderm cells from embryonic stem cells and embryos,enabling us to identify and define the molecular features of human hematopoietic mesoderm(HM)cells biased towards hematopoietic *** discovered that BMP4 plays an essential role in HM specification and can serve as a marker for HM ***,BMP4 acts as a downstream target of HDAC1,which modulates the expression of BMP4 by deacetylating its *** of HDAC significantly enhances HM specification and promotes subsequent hematopoietic cell *** conclusion,our study identifies human HM cells and describes new mechanisms for human hematopoietic development.

关键词： hematopoietic mesoderm human pluripotent stem cells human embryos BMP4 HDAC1

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脑过度灌注综合征的影像学研究进展

国际医学放射学杂志 2023年第5期46卷 543-546,550页

作者：范晓媛有慧冯逢(审校) 中国医学科学院北京协和医学院北京协和医院放射科北京100730

脑过度灌注综合征(CHS)是颈动脉血运重建术后少见但严重的并发症。影像学检查是诊断及预测CHS的重要手段,主要包括单光子发射计算机体层成像、CT、MRI和经颅多普勒超声。多种影像技术在术前、术中和术后早期均能提示CHS的发生,协助临床... 详细信息

脑过度灌注综合征(CHS)是颈动脉血运重建术后少见但严重的并发症。影像学检查是诊断及预测CHS的重要手段,主要包括单光子发射计算机体层成像、CT、MRI和经颅多普勒超声。多种影像技术在术前、术中和术后早期均能提示CHS的发生,协助临床医生制定治疗决策。近年来,影像学的发展提高了对CHS预测的准确性,但也存在一定的局限性。就CHS影像学检查方法及研究现状进行综述。

关键词：颈动脉狭窄脑过度灌注综合征单光子发射计算机体层成像磁共振成像体层摄影术,X线计算机经颅多普勒超声

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数字化赋能林业产业高质量发展研究现状及未来趋势

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林草政策研究 2023年第3期3卷 25-30页

作者：范小源任月东北林业大学经济管理学院哈尔滨150040

数字林业是数字中国重要的组成部分,是构筑国际竞争新优势的必然选择之一。我国数字林业在建设和应用方式上仍处在逐步发展完善的阶段,林业产业高质量发展也亟待依托与数字技术的充分融合。发达国家和发展中国家的林业数字化现状存在较... 详细信息

数字林业是数字中国重要的组成部分,是构筑国际竞争新优势的必然选择之一。我国数字林业在建设和应用方式上仍处在逐步发展完善的阶段,林业产业高质量发展也亟待依托与数字技术的充分融合。发达国家和发展中国家的林业数字化现状存在较大差异,汲取国际上林业数字化转型先行者的经验,对我国林业产业数字化与林业产业高质量发展具有重要参考价值。文中立足于中国和国际数字林业发展现状及问题的相似点,从国际比较的视角挖掘和剖析发达国家林业数字化发展在技术层面和管理层面的相关经验,据此提出对我国的启示:一是应促进林业数据整合共享,培养高素质的数字林业人员;二是完善政府政策支持;三是充分发挥数字技术对林业产业的空间溢出效应。在此基础上,提出未来的研究方向,包括深入分析数字化赋能林业产业高质量发展的理论机制及影响因素,立足于传统经济学、管理学理论研究基础的同时适度融合云计算、物联网、大数据等多种方法和工具来思考和解决问题,以期为林业产业高质量发展提供全方位支持。

关键词：数字赋能数字化转型林业产业高质量发展