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Ultraclean transfer of graphene by mechanically exfoliating polymer with modified crosslink density

Nano Research 2024年第8期17卷 6795-6802页

作者： Qi Lu Jiawei Yang chaofan zhou Zhaoning Hu Saiyu Bu Bingbing Guo Yixuan Zhao Junhao Liao Mingpeng Shang Ge Chen Kaicheng Jia Jianbo Yin Qiang Zeng Li Lin Zhongfan Liu College of Science China University of Petroleum(Beijing)Beijing 102249China School of Materials Science and Engineering Peking UniversityBeijing 100871China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute Beijing 100095China Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Department of Electronics Peking UniversityBeijing 100871China Second Clinical Division National Engineering Laboratory for Digital and Material Technology of StomatologyPeking University School and Hospital of StomatologyBeijing 100081China

The transfer of graphene from metallic substrates onto application-specific substrates is usually inevitable for the applications of high-quality graphene films derived from chemical vapour deposition(CVD)*** used to support the graphene films during the transfer,the coating of the polymer would produce the surface contaminations and hinder the industrially compatible *** this work,through the thermal imidization of polyamide acid(PAA)to polyimide(PI)and tuning of the concentration of dangling chains,we achieved the ultraclean and crack-free transfer of graphene wafers with high electronic *** resulting contamination-free and hydrophilic surface also enabled the observed improved cell viability in a biomedical *** avoiding aqueous etching or the usage of strong bases,our proposed transfer method is industrially compatible for batch transfer of graphene films towards the real applications.

关键词： chemical vapour deposition(CVD)graphene films graphene transfer ultraclean transfer transfer medium crosslink density cell viability assay

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A graph-based two-stage classification network for mobile screen defect inspection

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Frontiers of Information Technology & Electronic Engineering 2023年第2期24卷 203-216页

作者： chaofan zhou Meiqin LIU Senlin ZHANG Ping WEI Badong CHEN State Key Laboratory of Industrial Control Technology Zhejiang UniversityHangzhou310027China College of Electrical Engineering Zhejiang UniversityHangzhou310027China Institute of Artificial Intelligence and Robotics Xi’an Jiaotong UniversityXi’an710049China

Defect inspection,also known as defect detection,is significant in mobile screen quality *** are some challenging issues brought by the characteristics of screen defects,including the following:(1)the problem of interclass similarity and intraclass variation,(2)the difficulty in distinguishing low contrast,tiny-sized,or incomplete defects,and(3)the modeling of category dependencies for multi-label *** solve these problems,a graph reasoning module,stacked on a classification module,is proposed to expand the feature dimension and improve low-quality image features by exploiting category-wise dependency,image-wise relations,and interactions between *** further improve the classification performance,the classifier of the classification module is redesigned as a cosine similarity *** the help of contrastive learning,the classification module can better initialize the category-wise graph of the reasoning *** on the mobile screen defect dataset show that our two-stage network achieves the following best performances:97.7%accuracy and 97.3%*** proves that the proposed approach is effective in industrial applications.

关键词： Graph-based methods Multi-label classification Mobile screen defects Neural networks

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区域地面沉降研究进展与展望

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水文地质工程地质 2024年第4期51卷 167-177页

作者：朱琳宫辉力李小娟周超凡叶淼王海刚张可韩苗苗首都师范大学资源环境与旅游学院北京100048 水资源安全北京实验室北京100048 城市环境过程与数字模拟国家重点实验室培育基地北京100048 地面沉降机理与防控教育部重点实验室北京100048 河北沧州平原区地下水与地面沉降国家野外科学观测研究站河北沧州061000 中国地质环境监测院(自然资源部地质灾害技术指导中心) 北京100081

地面沉降是全球性重大地质环境问题,区域差异性地面沉降已经对城市基础设施、线性轨道交通和地下空间开发利用形成重大威胁,制约着经济和社会的可持续发展。围绕区域地表形变信息获取、地面沉降演变机制和模拟方面的研究进展进行系统阐... 详细信息

地面沉降是全球性重大地质环境问题,区域差异性地面沉降已经对城市基础设施、线性轨道交通和地下空间开发利用形成重大威胁,制约着经济和社会的可持续发展。围绕区域地表形变信息获取、地面沉降演变机制和模拟方面的研究进展进行系统阐述,重点分析了InSAR形变监测和多源形变数据融合的区域地表形变信息获取技术,基于室内土工试验数据和长时序观测数据,利用相关分析、统计分析和机器学习等方法分析地面沉降演变与各影响因素的关系。在此基础上,探讨了地下水流场—土体变形模型、数理统计模型和机器学习模型等地面沉降过程模拟模型的优缺点。发现多源形变数据融合能够提高区域地表形变信息的时空分辨率,地质构造、地层岩性、地下水开采和动静载荷等影响因素的差异性是造成地面沉降差异性演化的机制,地面沉降数学模型的计算效率与可解释性难以兼顾是当前沉降模拟存在的主要问题。据文献检索,当前研究主要关注地下水超量开采引发的地面沉降。进而提出未来区域地面沉降研究方向:在气候变化叠加新水情、新数据背景下,充分融合遥感大数据与野外观测站实测小数据集,耦合基于物理机制的模型和机器学习模型,优化集成InSAR、GeoAI、云平台等技术的最新进展,揭示全球气候变化和人类活动综合作用下的区域地面沉降演变机制,为区域地面沉降防控和城市安全提供技术支撑。

关键词：地面沉降合成孔径雷达干涉测量演化机制机器学习耦合模型

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广西壮族自治区α-珠蛋白基因罕见变异所致血红蛋白病的表型分析

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中华地方病学杂志 2024年第4期43卷 285-294页

作者：林丽左杨瑾陈碧艳周超凡江瑶瑶王梁罗静思徐湘民何升广西壮族自治区妇幼保健院遗传代谢中心实验室广西出生缺陷预防控制研究所广西出生缺陷防治基础研究重点实验室南宁

目的探讨广西壮族自治区(以下简称广西)α-珠蛋白基因罕见变异及其表型谱, 为罕见型血红蛋白病防治提供科学依据。方法以2015年1月至2022年12月在广西辖内11个市级妇幼保健院进行地中海贫血(以下简称地贫)检测的人群为研究对象, 根据血... 详细信息

目的探讨广西壮族自治区(以下简称广西)α-珠蛋白基因罕见变异及其表型谱, 为罕见型血红蛋白病防治提供科学依据。方法以2015年1月至2022年12月在广西辖内11个市级妇幼保健院进行地中海贫血(以下简称地贫)检测的人群为研究对象, 根据血液学和常规地贫基因检测结果纳入1 289例疑似罕见变异携带者。采集血液样本经多重探针杂交法联合一代测序进行罕见地贫基因检测。结果在1 289例疑似罕见变异携带者中, 共检测到234个α-珠蛋白基因罕见变异等位基因, 罕见变异检出率为18.2%;共包括55种罕见变异, 其中拷贝数变异(copy number variants, CNVs)、单核苷酸变异(single nucleotide variants, SNVs)及血红蛋白(hemoglobin, Hb)结构性变异分别占30.9%(17/55)、25.5%(14/55)、41.8%(23/55), 3种变异类型中检出率最高的罕见变异分别为-α2.4、ααIVS-Ⅱ-55、ααHb J-Wenchang-Wuming;另有1例融合基因, 为ααfusion gene。表型分析结果显示, 当α-珠蛋白基因罕见变异(αααanti4.2、ααfusion gene)复合β-珠蛋白基因Hb结构性变异(βHb G-Coushatta、βHb New York)时, 血液学表型仅发生轻微改变;2例罕见SNVs(ααCD31、ααInt)复合--SEA致Hb H病患者均表现为轻至中度贫血;部分ααIVS-Ⅱ-55携带者表现为红细胞计数、Hb、平均红细胞体积或/和平均红细胞Hb含量的轻度下降;Hb结构性变异(αα4.2-Hb Q-Thailand、ααHb Debao、ααHb Amsterdam-A1)复合大片段缺失(--SEA)时, 表现为典型的Hb H病特征。结论广西α-珠蛋白基因罕见变异在表型阳性疑似携带者中有较高检出率, 且变异类型多样;罕见变异携带者通常表现为静止型或轻型地贫, 复合其他类型珠蛋白基因变异时也可产生复杂表型。

关键词：血红蛋白病罕见变异 α-珠蛋白基因

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不同林龄华北落叶松优势木生长与空间结构的关联性

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陆地生态系统与保护学报 2024年第1期4卷 1-10页

作者：倪靖峰吕世琪王占印周超凡刘宪钊中国林业科学研究院资源信息研究所国家林业和草原局森林经营与生长模拟重点实验室北京100091 山西省文峪河国家级湿地公园管理局吕梁030199 江西省森林资源保护中心南昌330046

【目的】优势木的生长与其周围的相邻木密切相关,探究不同林龄林分中相邻木构成的空间结构特征对目标林木生长的影响,可以为调整空间结构进而激发林分生长潜力提供理论依据。【方法】选择27 a、37 a和46 a 3种不同林龄的华北落叶松人工... 详细信息

【目的】优势木的生长与其周围的相邻木密切相关,探究不同林龄林分中相邻木构成的空间结构特征对目标林木生长的影响,可以为调整空间结构进而激发林分生长潜力提供理论依据。【方法】选择27 a、37 a和46 a 3种不同林龄的华北落叶松人工林,分别设置面积为90 m×60 m、120 m×120 m和120 m×120 m的大样地,以优势木和其最近4株邻近木构建空间结构单元,计算每株优势木的角尺度、大小比数、混交度和密集度等指标,分析不同林龄中优势木在不同空间结构间的生长差异。【结果】优势木胸径和树高年均增长量均有显著的林龄差异,年均增长量随林龄增大而降低。在27 a林分的结构单元中,处于随机分布、优势、零度混交和密集状态的优势木占比最高,优势木平均胸径分别在角尺度为0.50、大小比数为0、混交度为0.75和密集度为1时最大,优势木平均树高分别在角尺度为0、大小比数为0、混交度为0.75和密集度为0.75时最大。在37 a的结构单元中,处于随机分布、优势、零度混交和非常密集状态的优势木占比最高,优势木平均胸径分别在角尺度为0.50、大小比数为0、混交度为0.5和密集度为0时最大,优势木平均树高分别在角尺度为0、大小比数为0、混交度为0.25和密集度为1时最大。在46 a的结构单元中,处于随机分布、优势、零度混交和稀疏状态的优势木占比最高,优势木平均胸径分别在角尺度为0.50、大小比数为0和密集度为0时最大,优势木平均树高分别在角尺度为0、大小比数为0和密集度为0时最大。【结论】水平分布格局、树种多样性、自身个体大小和树冠竞争影响优势木生长特征。在演替过程中,优势木朝着减小聚集程度和竞争压力的方向上发展,适当提升优势木的混交程度和保证优势木个体的生长优势利于其胸径和树高生长。在质量选择阶段,宜进一步选择生长好的优势木作为目标树,适当抚育采伐,优化结构单元,以人工促进天然更新等手段提升林分稳定性。在近自然阶段,应及时清理枯立木,通过人工促进天然更新和清除干扰木,继续优化空间结构。

关键词：发育阶段结构单元空间结构参数优势木生长

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外周血红细胞分布宽度在胰腺癌中的诊断价值

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中国当代医药 2024年第8期31卷 110-113页

作者：张玲玲张雪花吕晓丹周超凡唐文庭广西壮族自治区妇幼保健院检验科广西南宁530002 广西医科大学第一附属医院检验科广西南宁530021 广西壮族自治区妇幼保健院遗传代谢实验室广西南宁530002

目的分析红细胞分布宽度(RDW)在胰腺癌患者中的变化,以评估RDW在胰腺癌中的潜在诊断价值。方法回顾性分析2016年1月至2018年12月广西医科大学第一附属医院的242例胰腺癌患者(胰腺癌组)和249名健康对照者(正常对照组)的临床资料,比较两... 详细信息

目的分析红细胞分布宽度(RDW)在胰腺癌患者中的变化,以评估RDW在胰腺癌中的潜在诊断价值。方法回顾性分析2016年1月至2018年12月广西医科大学第一附属医院的242例胰腺癌患者(胰腺癌组)和249名健康对照者(正常对照组)的临床资料,比较两组患者的血常规参数,采用Pearson相关性分析评估RDW与其他血液炎性参数的相关性,采用ROC评估RDW在胰腺癌中的诊断效能。结果胰腺癌组的白细胞(WBC)、中性粒细胞(NEU)、RDW水平均高于正常对照组,血红蛋白(Hb)、血小板(PLT)、淋巴细胞(LYM)水平均低于正常对照组,差异有统计学意义(P<0.05)。相关性分析结果显示,RDW与Hb(r=-0.553,P<0.001)和平均红细胞体积(MCV)(r=-0.263,P<0.001)呈负相关,与血小板分布宽度(PDW)(r=0.170,P=0.008)和平均血小板体积(MPV)呈正相关(r=0.227,P<0.001)。同时RDW水平与胰腺癌的转移呈正相关(r=0.169,P=0.008)。ROC曲线分析显示,RDW预测胰腺癌的最佳临界值为14.5,AUC为0.810,95%CI为0.770~0.850,P<0.05,敏感度和特异度分别为59.9%和99.6%。结论RDW在胰腺癌患者中升高,或可在胰腺癌诊断评估方面具有一定的临床指导意义。

关键词：胰腺癌红细胞分布宽度炎症血常规参数诊断价值

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Preferentially selective extraction of lithium from spent LiCoO_(2)cathodes by medium-temperature carbon reduction roasting

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 315-322页

作者： Daixiang Wei Wei Wang Longjin Jiang Zhidong Chang Hualei zhou Bin Dong Dekun Gao Minghui Zhang chaofan Wu School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Anhui Chaoyue Environmental Protection Technology Co. LtdChuzhou 239060China Anhui Huihong Technology Co. LtdChuzhou 239060China

Lithium recovery from spent lithium-ion batteries(LIBs)have attracted extensive attention due to the skyrocketing price of *** medium-temperature carbon reduction roasting was proposed to preferential selective extraction of lithium from spent Li-CoO_(2)(LCO)cathodes to overcome the incomplete recovery and loss of lithium during the recycling *** LCO layered structure was destroyed and lithium was completely converted into water-soluble Li2CO_(3)under a suitable temperature to control the reduced state of the cobalt *** Co metal agglomerates generated during medium-temperature carbon reduction roasting were broken by wet grinding and ultrasonic crushing to release the entrained *** results showed that 99.10%of the whole lithium could be recovered as Li2CO_(3)with a purity of 99.55%.This work provided a new perspective on the preferentially selective extraction of lithium from spent lithium batteries.

关键词： spent LiCoO_(2)cathodes medium-temperature carbon reduction lithium extraction priority crystal transformation macro-scopic transport resistance

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High recorded color rendering performance of single-structured Ce,Mn:Y_(3)(Al,Sc)_(2)Al_(3)O_(12)phosphor ceramics for high-power white LEDs/LDs

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Journal of Advanced Ceramics 2024年第6期13卷 810-820页

作者： Xuanchu Liu Congcong Yang Yanbin Li Chang Min Jian Kang Tianyuan zhou Chunming zhou chaofan Shi Cen Shao Bingheng Sun Wieslaw Strek Hao Chen Le Zhang Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronics EngineeringJiangsu Normal UniversityXuzhou 221116China Jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology Xuzhou 221400China Xuzhou EAGLED Technology Co. Ltd.Xuzhou 221116China Xuzhou Kangna Advanced Materials Technology Co. Ltd.Xuzhou 221116China Shanghai Institute of Optics Fine Mechanics Chinese Academy of SciencesShanghai 201800China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

Achieving a high color rendering index(CRI)and luminous stability in single-structured Ce:Y_(3)Al_(5)O_(12)(Ce:YAG)phosphor ceramics(PCs)is crucial for high-power white light-emitting diodes or laser diodes(LEDs/LDs).However,cyan valleys and insufficient amounts of the red component in the Ce:YAG emission spectra significantly limit their real *** this work,a series of Ce,Mn:Y_(3)(Al,Sc)_(2)Al_(3)O_(12)(Ce,Mn:YSAG)PCs were fabricated by vacuum sintering,and efficient spectral regulation was realized for full-color *** cyan valley was filled by the blueshifted emission peak of Ce^(3+)via Sc^(3+)*** orange‒red emission at approximately 580 nm was effectively supplemented via Mn^(2+)*** particular,CRI of Ce,Mn:YSAG increased from 56.4 to 85.8,a 52%increase compared with that of Ce:YAG under high-power LED excitation,and the operating temperature was stable at approximately 50℃for long working ***,CRI of 80.9 could still be obtained for PC-based white *** results indicated that Ce,Mn:YSAG PC,which has excellent CRI and luminous stability,is an extremely promising color convertor for high-power white LEDs/LDs.

关键词： color rendering index(CRI) color converter Ce:Y_(3)Al_(5)O_(12)(Ce:YAG)phosphor ceramics(PCs) high-power white light-emitting diodes or laser diodes(LEDs/LDs) luminous stability

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Robust superhydrophobic polyurethane sponge functionalized with perfluorinated graphene oxide for efficient immiscible oil/water mixture, stable emulsion separation and crude oil dehydration

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Science China(Technological Sciences) 2019年第9期62卷 1585-1595页

作者： CAO Ning GUO JingYu BOUKHERROUB Rabah SHAO QingGuo ZANG XiaoBei LI Jin LIN XueQiang JU Hong LIU EnYang zhou chaofan LI HuiPing Key Laboratory of Unconventional Oil & Gas Development Ministry of EducationChina University of Petroleum (East China)Qingdao 266580China School of Materials Science and Engineering China University of Petroleum (East China)Qingdao 266580China Univ. Lille CNRSCentrale LilleISENUniv. ValenciennesUMR 8520IEMNLilleFrance School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

In recent years, graphene oxide(GO), prepared by the modified Hummers’ method, and its derivatives have become a focus of research owing to their outstanding physical and chemical properties and low cost. Drawing inspiration from the mussel protein,a facile and environmentally-friendly method was employed to fabricate superhydrophobic/superoleophilic reduced graphene oxide(rGO) derivative. The preparation comprises two steps: coating GO nanosheets with polydopamine(PDA) and subsequent reaction with 1H,1H,2H,2H-perfluorodecanethiol. Due to the excellent adhesive ability of PDA, the resulting f PDA modified rGO nanosheets(rGO-f PDA) were firmly immobilized onto polyurethane(PU) sponge skeleton by a simple drop-coating method. The as-prepared rGO-f PDA functionalized sponge exhibited superhydrophobic behavior with a water contact angle of 162°±2°, high organic adsorption capacity, recyclability and stable oil/water separation behavior under different acidic/alkaline conditions. Due to its facile fabrication technique and outstanding properties, the superhydrophobic-superoleophilic PU-rGOf PDA sponge holds great promise as an oil adsorbent for cleaning up large-scale pollution of oil and organic solvents, and dehydrating crude oil.

关键词： graphene oxide superhydrophobic sponge adsorption oil/water separation emulsion

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Will the Globe Encounter the Warmest Winter after the Hottest Summer in 2023?

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Advances in Atmospheric Sciences 2024年第4期41卷 581-586页

作者： Fei ZHENG Shuai HU Jiehua MA Lin WANG Kexin LI Bo WU Qing BAO Jingbei PENG chaofan LI Haifeng ZONG Yao YAO Baoqiang TIAN Hong CHEN Xianmei LANG Fangxing FAN Xiao DONG Yanling ZHAN Tao ZHU Tianjun zhou Jiang ZHU International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Nansen-Zhu International Research Centre(NZC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Center for Monsoon System Research(CMSR) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China CAS Key Lab of Regional Climate-Environment for Temperate East Asia(RCE-TEA) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

In the boreal summer and autumn of 2023,the globe experienced an extremely hot period across both oceans and *** consecutive record-breaking mean surface temperature has caused many to speculate upon how the global temperature will evolve in the coming 2023/24 boreal *** this report,as shown in the multi-model ensemble mean(MME)prediction released by the Institute of Atmospheric Physics at the Chinese Academy of Sciences,a medium-to-strong eastern Pacific El Niño event will reach its mature phase in the following 2−3 months,which tends to excite an anomalous anticyclone over the western North Pacific and the Pacific-North American teleconnection,thus serving to modulate the winter climate in East Asia and North *** some uncertainty due to unpredictable internal atmospheric variability,the global mean surface temperature(GMST)in the 2023/24 winter will likely be the warmest in recorded history as a consequence of both the El Niño event and the long-term global warming ***,the middle and low latitudes of Eurasia are expected to experience an anomalously warm winter,and the surface air temperature anomaly in China will likely exceed 2.4 standard deviations above climatology and subsequently be recorded as the warmest winter since ***,the necessary early warnings are still reliable in the timely updated mediumterm numerical weather forecasts and sub-seasonal-to-seasonal prediction.

关键词： winter climate El Niño seasonal forecast GMST

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