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Journal of Advanced Ceramics 2024年第2期13卷 135-142页

作者： Yudi Qiu Shunjian Xu Xiangzhao Zhang Mingfen Zhang Qinhan guo Beiji Wang guanjun Qiao Guiwu Liu School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Intelligent Manufacturing Huzhou CollegeHuzhou 313000China

We firstly performed the reactive air wetting and brazing of Al_(2)O_(3) ceramics using Ag-(0.5-12)Nb_(2)O_(5) fillers,where Nb_(2)O_(5) can react with liquid Ag and O2 from air to generate AgNbO_(3).The contact angle of the Ag-Nb_(2)O_(5)/Al_(2)O_(3) system almost linearly decreases from~71.6°to 32.5°with the Nb_(2)O_(5) content increasing,and the joint shear strength reaches the maximum of~65.1 MPa while employing the Ag-4Nb_(2)O_(5) filler,which are mainly related to the formation and distribution of the AgNbO_(3) phase at the interface.Moreover,the interfacial bonding and electronic properties of related interfaces were investigated by first-principles calculations.The calculated works of adhesion(Wa)of Ag(111)/Ag-O-AgNbO_(3)(001)and AgNbO_(3)(001)/Al_(2)O_(3)(100)interfaces are higher than that of the Ag(111)/Al_(2)O_(3)(110)interface,indicating good reliability of the Ag/AgNbO_(3)/Al_(2)O_(3) structure.The relatively large interfacial charge transfer indicates the formation of Ag-Ag,Al-O,and Ag-O bonds in the Ag/AgNbO_(3)/Al_(2)O_(3) structure,which can contribute to the interfacial bonding.

关键词： reactive air brazing(RAB) wettability microstructure shear strength first-principles calculations

Targeted treatment strategy for patients with severe pulmonary hypertension secondary to connective tissue diseases

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Rheumatology & Autoimmunity 2023年第3期3卷 157-165页

作者： Bo Jiang Chun Wang Yansheng Jin guanjun guo Kangxing Zhou Xuebing Feng Genhong Yao Department of Rheumatology and Immunology The Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjingJiangsuChina Department of Rheumatology and Immunology Wuzhong People's HospitalSuzhouJiangsuChina Department of Cardiac Ultrasound The Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjingJiangsuChina

Background:Pulmonary arterial hypertension(PAH)associated with connective tissue diseases(CTD)(CTD-PAH)remains a difficult challenge in clinical practice.We aimed to evaluate the effects of targeted vasodilators in patients with severe CTD-PAH.Methods:The data of 53 patients with severe CTD-PAH hospitalized at the Department of Rheumatology and Immunology,The Affiliated Drum Tower Hospital of Nanjing University Medical School,were retrospectively reviewed.Patients were followed up for an average of 2 years to track their outcomes.The efficacy of treatment and the survival rate of patients with severe CTD-PAH were determined.Results:Among the causes of severe CTD-PAH,systemic lupus erythematosus(SLE)was the most common(39.6%),and the age at onset in patients with SLE-PAH was younger than that of patients with other CTD.Bosentan was more effective than sildenafil in reducing pulmonary artery pressure,improving cardiac function,and increasing survival time.Combination therapy with targeted vasodilators significantly improved the prognosis of patients with severe CTD-PAH compared with monotherapy.Conclusions:Patients with severe CTD-PAH should be treated early with targeted vasodilators.In this study,bosentan was superior to sildenafil.Combined treatment might be an option for severe CTD-PAH.

关键词： connective tissue disease pulmonary arterial hypertension systemic lupus erythematosus targeted vasodilator

Large margin deep embedding for aesthetic image classification

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Science China(Information Sciences) 2020年第1期63卷 229-231+259-264页

作者： guanjun guo Hanzi WANG Yan YAN Liming ZHANG Bo LI Fujian Key Laboratory of Sensing and Computing for Smart City School of Information Science and EngineeringXiamen University Faculty of Science and Technology University of Macau Beijing Key Laboratory of Digital Media School of Computer Science and EngineeringBeihang University

Dear editor,The problem of aesthetic image classification has attracted much attention during the past few years. The recently proposed methods [1–4] based on the deep convolutional neural network (CNN)[5,6]have achi... 详细信息

关键词： net CNN image Large margin deep embedding for aesthetic image classification

融合肌电和超声射频信号特征的骨骼肌肌力评估研究

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中国生物医学工程学报 2024年第3期43卷 306-314页

作者：韩欢吕倩尹冠军张良梅张蓓蕾郭建中陕西师范大学物理学与信息技术学院陕西省超声重点实验室西安710119

肌力是反映肌肉状态的重要参数,可表征人体的运动功能、肌肉健康状态以及疲劳程度。无创肌力评估技术在体育运动指导、肌肉疾病诊断、康复状态评价等诸多领域具有重要理论意义和广泛应用价值。本研究提出一种基于深度学习算法对表面肌电... 详细信息

肌力是反映肌肉状态的重要参数,可表征人体的运动功能、肌肉健康状态以及疲劳程度。无创肌力评估技术在体育运动指导、肌肉疾病诊断、康复状态评价等诸多领域具有重要理论意义和广泛应用价值。本研究提出一种基于深度学习算法对表面肌电(sEMG)和超声射频(RF)信号进行特征融合分析的肌力评估方法,利用卷积神经网络(CNN)和池化操作提取信号的有效特征(CNNFeat),并作为支持向量机(SVM)分类器的输入进行处理和分类。该方法利用CNN-SVM网络探究CNNFeat对信号特征的识别能力,并验证sEMG与超声RF信号融合的互补性。实验采集10名健康受试者肱二头肌在不同负荷下的sEMG和超声RF信号。在多用户场景模式下的处理结果表明,CNNFeat与传统肌电信号和超声射频信号的特征相比,能够提高分类性能,具有较强的鲁棒性。肌电信号的准确率为84.23%,超声信号的准确率为89.34%,而融合信号的准确率高达96%,且融合信号的震荡较小,损耗收敛更快。

关键词：肌力评估超声信号表面肌电信号卷积神经网络

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环氧树脂醇解回收再制备固化动力学研究

西安交通大学学报 2024年第7期58卷 94-104页

作者：赵鑫李文栋郭旺杨雄郭广致邹方正高国新张冠军西安交通大学电工材料电气绝缘全国重点实验室西安710049 国网冀北电力有限公司廊坊供电公司河北廊坊065099 西安交通大学化学学院西安710049

针对利用环氧树脂醇解产物制备新树脂固化工艺缺乏分析的问题,首先运用非等温差示扫描量热法,研究了醇解产物含量对再制备树脂固化行为的影响。随后通过固化动力学模型,确定了再制备树脂的固化条件,并以此制备得到新树脂,测量了其介电... 详细信息

针对利用环氧树脂醇解产物制备新树脂固化工艺缺乏分析的问题,首先运用非等温差示扫描量热法,研究了醇解产物含量对再制备树脂固化行为的影响。随后通过固化动力学模型,确定了再制备树脂的固化条件,并以此制备得到新树脂,测量了其介电性能。结果表明:当醇解产物替代双酚A二缩水甘油醚质量分数为25%时,再制备树脂的预固化温度小于120℃,后固化温度为160.57℃,这是因为,醇解产物中的羟基可促进环氧基的开环反应,使得再制备树脂的固化温度随醇解产物含量增加而降低;再制备树脂符合自催化双参数固化动力学模型,总反应级数大于1,且固化过程中的表观活化能Ea是固化程度α的函数,基于Ea(α)函数得到试样实际固化程度接近理论值;与原始环氧树脂相比,再制备树脂的相对介电常数、介质损耗和击穿电场强度有所增加,其介电性能满足电工用环氧树脂使用要求。该研究内容为醇解回收再制备环氧树脂的固化工艺提供了经验和指导。

关键词：环氧树脂醇解回收固化动力学

第三代抗精神病药物引发冲动控制障碍的研究进展

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神经疾病与精神卫生 2024年第2期24卷 121-127页

作者：陈俐合郭茜刘晓华李冠军上海交通大学医学院附属精神卫生中心 200030 国家精神疾病医学中心精神科急重症诊疗中心上海200030

冲动控制障碍(ICDs)是一类在没有合理的动机下重复出现自己不能控制而伤害他人或自己利益行为的精神障碍,常见表现有病理性赌博、性欲亢进、强迫性购物、强迫性进食等,对患者自身、家庭和社会均造成沉重负担。第三代抗精神病药物(TGAs)... 详细信息

冲动控制障碍(ICDs)是一类在没有合理的动机下重复出现自己不能控制而伤害他人或自己利益行为的精神障碍,常见表现有病理性赌博、性欲亢进、强迫性购物、强迫性进食等,对患者自身、家庭和社会均造成沉重负担。第三代抗精神病药物(TGAs)包括阿立哌唑、布瑞哌唑和卡利拉嗪等,对多巴胺D2、D3和5-羟色胺1A受体存在激动或部分激动作用,可能引发ICDs,然而目前临床中仍存在识别不足、筛查工具不明确、干预手段有限等局限性,对TGAs引发ICDs的认知及疾病干预水平需进一步提升。本文从TGAs引发ICDs的流行病学、危险因素、生理机制、临床评估、诊断及治疗进展进行综述,以期提高临床医生对该疾病的了解与识别,及早采取合适的治疗手段,减轻患者痛苦,改善疾病预后。

关键词：冲动控制障碍第三代抗精神病药物阿立哌唑布瑞哌唑卡利拉嗪综述

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一种超声心动图关键帧智能检测方法

南京医科大学学报（自然科学版） 2024年第2期44卷 253-262页

作者：杜悦史中青戚占如曾子炀郭冠军姚静罗守华顾宁南京医科大学生物医学工程与信息学院江苏南京211166 南京大学医学院附属鼓楼医院超声医学科江苏南京210008 东南大学生物科学与医学工程学院江苏南京210096 南京大学医学院江苏南京210093

目的:探讨基于深度学习(deep learning,DL)的ResNet+VST模型在超声心动图关键帧智能检测方面的可行性。方法:选取南京大学医学院附属鼓楼医院超声医学科采集的663个动态图像含心尖二腔(apical two chambers,A2C)、心尖三腔(apical three... 详细信息

目的:探讨基于深度学习(deep learning,DL)的ResNet+VST模型在超声心动图关键帧智能检测方面的可行性。方法:选取南京大学医学院附属鼓楼医院超声医学科采集的663个动态图像含心尖二腔(apical two chambers,A2C)、心尖三腔(apical three chambers,A3C)与心尖四腔(apical four chambers,A4C)3类临床检查常用切面以及EchoNet⁃Dynamic公开数据集中280个A4C切面动态图像,分别建立南京鼓楼医院数据集与EchoNet⁃Dynamic⁃Tiny数据集,各类别图像按4∶1方式划分为训练集和测试集,进行ResNet+VST模型的训练以及与多种关键帧检测模型的性能对比,验证ResNet+VST模型的先进性。结果:ResNet+VST模型能够更准确地检测心脏舒张末期(end⁃diastole,ED)与收缩末期(end⁃systole,ES)图像帧。在南京鼓楼医院数据集上,模型对A2C、A3C和A4C切面数据的ED预测帧差分别为1.52±1.09、1.62±1.43、1.27±1.17,ES预测帧差分别为1.56±1.16、1.62±1.43、1.45±1.38;在EchoNet⁃Dynamic⁃Tiny数据集上,模型对A4C切面数据的ED预测帧差为1.62±1.26,ES预测帧差为1.71±1.18,优于现有相关研究。此外,ResNet+VST模型有良好的实时性表现,在南京鼓楼医院数据集与EchoNet⁃Dynamic⁃Tiny数据集上,基于GTX 3090Ti GPU对16帧的超声序列片段推理的平均耗时分别为21 ms与10 ms,优于以长短期记忆单元(long short⁃term memory,LSTM)进行时序建模的相关研究,基本满足临床即时处理的需求。结论:本研究提出的ResNet+VST模型在超声心动图关键帧检测的准确性、实时性方面,相较于现有研究有更出色的表现,该模型原则上可推广到任何超声切面,有辅助超声医师提升诊断效率的潜力。

关键词：超声心动图关键帧深度学习

Electrochemical reaction mechanism of porous Zn_(2)Ti_(3)O_(8)as a high-performance pseudocapacitive anode for Li-ion batteries

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Chinese Chemical Letters 2022年第11期33卷 4776-4780页

作者： Weijie Cheng Qi Feng Zhanglin guo guanjun Chen Yong Wang Lixiong Yin Jiayin Li Xingang Kong School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China Graduate School of Engineering Toin University of YokohamaKanagawa 225-8503Japan Department of Advanced Materials Science Faculty of EngineeringKagawa University2217-20 Hayashi-choTakamatsu-shi 761-0396Japan

Zn_(2)Ti_(3)O_(8),as a new type of anode material for lithium-ion batteries,is attracting enormous attention because of its low cost and excellent safety.Though decent capacities have been reported,the electrochemical reaction mechanism of Zn_(2)Ti_(3)O_(8)has rarely been studied.In this work,a porous Zn_(2)Ti_(3)O_(8)anode with considerably high capacity(421 mAh/g at 100 mA/g and 209 mAh/g at 5000 mA/g after 1500 cycles)was reported,which is even higher than ever reported titanium-based anodes materials including Li_(4)Ti_(5)O_(12),TiO_(2)and Li_(2)ZnTi_(3)O_(8).Here,for the first time,the accurate theoretical capacity of Zn_(2)Ti_(3)O_(8)was confirmed to be 266.4 mAh/g.It was also found that both intercalation reaction and pseudocapacitance contribute to the actual capacity of Zn_(2)Ti_(3)O_(8),making it possibly higher than the theoretical value.Most importantly,the porous structure of Zn_(2)Ti_(3)O_(8)not only promotes the intercalation reaction,but also induces high pseudocapacitance capacity(225.4 mAh/g),which boosts the reversible capacity.Therefore,it is the outstanding pseudocapacitance capacity of porous Zn_(2)Ti_(3)O_(8)that accounts for high actual capacity exceeding the theoretical one.This work elucidates the superiorities of porous structure and provides an example in designing high-performance electrodes for lithium-ion batteries.

关键词： Zn_(2)Ti_(3)O_(8) Lithium-ion battery Electrochemical reaction mechanism Theoretical capacity Pseudocapacitance

高功率载荷卫星供配电系统安全性设计及在轨验证

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电工技术 2024年第7期 90-92页

作者：刘政黄业平颜冠军郭晶晶王瑞上海卫星工程研究所上海200240

卫星供配电系统一旦发生短路或断电等故障,可能造成整星失效的灾难性后果,卫星供配电安全性是在轨可靠运行的基本保障条件。针对某承载高功率高压载荷卫星的供配电高风险的特性,采取了平台载荷双独立母线、蓄电池组放电过压保护、限流... 详细信息

卫星供配电系统一旦发生短路或断电等故障,可能造成整星失效的灾难性后果,卫星供配电安全性是在轨可靠运行的基本保障条件。针对某承载高功率高压载荷卫星的供配电高风险的特性,采取了平台载荷双独立母线、蓄电池组放电过压保护、限流保护、卫星放电开关安全控制等多种安全性设计措施,确保卫星能源安全。卫星在轨运行情况表明,卫星供配电在轨状态稳定可靠,系统安全性良好。

关键词：卫星供配电系统安全性设计高功率载荷

pH-responsive aldehyde-bearing cyclometalated iridium(Ⅲ) complex for tracking intracellular pH fluctuations under external stimulation

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中国化学快报：英文版 2023年第2期34卷 244-248页

作者： Manping Qian Danyang Zhang Hetong Qi Xuebing Yang guanjun Yin Chengxiao Zhang Jianzhong guo Honglan Qi Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710062China School of Chemistry Xi'an Jiaotong UniversityXi'an 710049China Shaanxi Province Key Laboratory of Ultrasound School of Physics and Information TechnologyShaanxi Normal UniversityXi'an 710062China

Intracellular p H undertakes critical functions in various biological and pathological processes. It is important to monitor intracellular p H fluctuations for understanding physiological and pathological processes.Here, one aldehyde-bearing cyclometalated iridium(Ⅲ) complex([(4-pba)_(2)Ir(dcphen)]PF_(6), 4-pba = 4-(2-pyridyl) benzaldehyde, dcphen = 4,7-dichloro-1,10-phenanthroline, probe 1) was synthesized and used to track intracellular p H fluctuations. Probe 1 displayed p H-dependent luminescence property in p H range of 1.81–6.81 with an evaluated p Kavalue of 4.30 in BR buffer-DMSO(v:v = 99:1). An intramolecular hydrogen bonds assisted p H-responsive mechanism was proposed for the p H-responsive behavior of probe1. Probe 1 was successfully applied for imaging and tracking p H fluctuations in He La cells under external stimulation with fast response time, good photostability as well as low cytotoxicity and high cell permeability. This work demonstrates that aldehyde-bearing cyclometalated iridium(Ⅲ) complex can be used as alternative p H-responsive probe for real-time tracking intracellular p H fluctuations, which provides a strategy for the design of p H-responsive probe in versatile applications.

关键词： Cyclometalated iridium(Ⅲ)complex Photoluminescence pH Intramolecular hydrogen bonds External stimulation