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A machine perspective of atomic defects in scanning transmission electron microscopy

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InfoMat 2019年第3期1卷 359-375页

作者： jiadong dan Xiaoxu Zhao Stephen J.Pennycook NUS Graduate School for Integrative Sciences and Engineering National University of SingaporeSingapore Department of Materials Science and Engineering National University of SingaporeSingapore

Enabled by the advances in aberration-corrected scanning transmission electron microscopy(STEM),atomic-resolution real space imaging of materials has allowed a direct structure-property *** ways of quantitative data analysis suffer from low yield and poor *** ideas in the field of computer vision and machine learning have provided more momentum to harness the wealth of big data and sophisticated information in STEM data analytics,which has transformed STEM from a localized characterization technique to a macroscopic tool with *** this review article,we discuss the prime significance of defect topology and density in two-dimensional(2D)materials,which have proved to be a powerful means to tune a wide range of ***,we systematically review advanced data analysis methods that have demonstrated promising prospects in analyzing STEM data,particularly for identifying structural defects,with high throughput and veracity.A unified framework for atomic structure identification is also summarized.

关键词： 2D materials atomic defects machine learning scanning transmission electron microscopy

气相色谱法同时测定肥料中6种植物生长调节剂

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分析科学学报 2022年第5期38卷 611-616页

作者：王庆彬赵红玲彭春娥史磊孙健孟慧但加东高漪张民土肥高效利用国家工程中心山东农业大学资源与环境学院山东泰安271018 山东蓬勃生物科技有限公司山东泰安271000 作物生物学国家重点实验室山东农业大学生命科学学院山东泰安271018

采用超声辅助提取结合衍生技术,建立了一种气相色谱同时测定肥料中常用6种植物生长调节剂(PGRs),包括萘乙酸(NAA)、萘乙酸钠(SNA)、胺鲜酯(DA-6)、多效唑(MET)、烯效唑(HS)及三十烷醇(TA)的方法。采用三氯甲烷作为DA-6、HS、MET及TA的... 详细信息

采用超声辅助提取结合衍生技术,建立了一种气相色谱同时测定肥料中常用6种植物生长调节剂(PGRs),包括萘乙酸(NAA)、萘乙酸钠(SNA)、胺鲜酯(DA-6)、多效唑(MET)、烯效唑(HS)及三十烷醇(TA)的方法。采用三氯甲烷作为DA-6、HS、MET及TA的提取溶剂,正己烷为NAA及SNA的提取溶剂,以三氟化硼-甲醇溶液为衍生试剂,选择通用性KB-5色谱柱,优化了响应值、分离度及保留时间等。结果表明:6种PGRs在其线性范围内线性关系良好,决定系数(R^(2))≥0.9993,加标回收率范围为87.38%-108.75%,相对标准偏差(RSD)<5%(n=3),在信噪比等于3的条件下,NAA及SNA检出限为4 mg/kg、DA-6及HS检出限为8 mg/kg、MET检出限为10 mg/kg、TA检出限为30 mg/kg。本方法用于肥料中PGRs的检测,操作简便、成本低廉、便于推广,而且准确度高、回收率稳定、重现性好。

关键词：植物生长调节剂气相色谱肥料方法集成

Somatostatin-Positive Neurons in the Rostral Zona Incerta Modulate Innate Fear-Induced Defensive Response in Mice

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Neuroscience Bulletin 2023年第2期39卷 245-260页

作者： Shan Lin Meng-Yue Zhu Meng-Yu Tang Mi Wang Xiao-dan Yu Yi Zhu Shi-Ze Xie dan Yang jiadong Chen Xiao-Ming Li Department of Neurobiology and Department of Neurology of the Second Afliated Hospital Zhejiang University School of MedicineHangzhou 310058China NHC and CAMS Key Laboratory of Medical Neurobiology MOE Frontier Science Center for Brain Research and Brain-Machine IntegrationSchool of Brain Science and Brian MedicineZhejiang UniversityHangzhou 310058China Center for Brain Science and Brain-Inspired Intelligence Research Units for Emotion and Emotion DisordersChinese Academy of Medical SciencesChina/Guangdong-Hong Kong-Macao Greater Bay AreaJoint Institute for Genetics and Genome Medicine between Zhejiang University and the University of TorontoHangzhou 310058China

Defensive behaviors induced by innate fear or Pavlovian fear conditioning are crucial for animals to avoid threats and ensure *** zona incerta(ZI)has been demonstrated to play important roles in fear learning and fear memory,as well as modulating auditory-induced innate defensive ***,whether the neuronal subtypes in the ZI and specific circuits can mediate the innate fear response is largely ***,we found that somatostatin(SST)-positive neurons in the rostral ZI of mice were activated by a visual innate fear *** inhibition of SST-positive neurons in the rostral ZI resulted in reduced flight responses to an overhead looming *** activation of SST-positive neurons in the rostral ZI induced fear-like defensive behavior including increased immobility and *** addition,we demonstrated that manipulation of the GABAergic projections from SST-positive neurons in the rostral ZI to the downstream nucleus reuniens(Re)mediated fear-like defensive *** trans-synaptic tracing also revealed looming stimulus-activated neurons in the superior colliculus(SC)that projected to the Re-projecting SST-positive neurons in the rostral ZI(SC-ZIrSST-Re pathway).Together,our study elucidates the function of SST-positive neurons in the rostral ZI and the SC-ZIrSST-Re tri-synaptic circuit in mediating the innate fear response.

关键词： Innate fear Zona incerta Somatostatinpositive neurons Looming stimulus Defensive behavior

2D/2D atomic double-layer WS_(2)/Nb_(2)O_(5)shell/core nanosheets with ultrafast interfacial charge transfer for boosting photocatalytic H_(2)evolution

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Chinese Chemical Letters 2021年第10期32卷 3128-3132页

作者： Bo Lin Hao Chen Yao Zhou Xiao Luo dan Tian Xiaoqing Yan Ruihuan Duan Jun Di Lixing Kang Aimin Zhou Guidong Yang Yonghui Li jiadong Zhou Zheng Liu Fucai Liu School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Wuhan Second Ship Design and Research Institute Wuhan 430200China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037China XJTU-Oxford International Joint Laboratory for Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi’an 710049China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Physics and Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300350China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Low-efficiency charge transfer is a critical factor to limit the photocatalytic H_(2)evolution activity of semiconductor *** interface design is a promising approach to achieve high chargetransfer efficiency for ***,a new 2 D/2 D atomic double-layer WS_(2)/Nb_(2)O_(5)shell/core photocatalyst(DLWS/Nb_(2)O_(5))is *** atom-resolved HAADF-STEM results unravel the presence of an unusual 2 D/2 D shell/core interface in DLWS/Nb_(2)O_(5).Taking advantage of the advanced femtosecond-resolved ultrafast TAS spectra,the average lifetime of charge carriers for DLWS/Nb_(2)O_(5)(180.97 ps)is considerably shortened as compared to that of Nb_(2)O_(5)(230.50 ps),strongly indicating that the 2 D/2 D shell/core interface enables DLWS/Nb_(2)O_(5)to achieve ultrafast charge transfer from Nb_(2)O_(5)to atomic double-layer WS_(2),thus yielding a high photocatalytic H_(2)evolution rate of 237.6 mmol/h,up to10.8 times higher than that of pure Nb_(2)O_(5)*** study will open a new window for the development of high-efficient photocatalytic systems through the interface design.

关键词： 2D/2D shell/core interface Atomic double-layer WS_(2) Nb_(2)O_(5)nanosheet Charge transfer Photocatalytic H_(2)evolution

Deposition and antibacterial properties of Ag nanoparticles on dopamine coated carbon nanotubes

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Deposition and antibacterial properties of Ag nanoparticles ...

Space-confined microwave synthesis of ternary-layered BiOCl crystals with high-performance ultraviolet photodetection

2014中国功能材料科技与产业高层论坛

作者： dan Liu Wenchao Liu Hui Du Zhenqing Ma Hongfen Wang jiadong Yang Shougang Chen Institute of Materials Science and Engineering Ocean University of China

In order to reduce the releasing rate of nanosilver in solutions,the carbon nanotube was selected to combine with *** higher dispersion of Ag nanoparticles（AgNPs）was in-situ prepared on the dopamine coated carbon nanotubes by a mild and environmentally friendly *** structure and nature of dopamine modified MWCNTs（PDA/MWCNTs）and silver nanoparticles/polydopamine/multi-walled carbon nanotubes composites（Ag/PDA/MWCNTs）were investigated with transmission electron microscopy（TEM）,Fourier transform infrared spectroscopy（FT-IR）,X-ray diffraction（XRD）and X-ray photoelectron spectroscopy（XPS）.Antimicrobial activity of hybrid material was investigated by the disk-diffusion test against Gram-negative *** synergistic effect of PDA and AgNPspromote the deposition of AgNPs,moreover,the suitable particle size of AgNPs（7 nm）can accelerate the approaching of AgNPs to the nuclearcontent of bacteria and they present greater surface area;therefore the resultant Ag/PDA/MWCNTs hybrid materials exhibited strongantibacterial property.

关键词： Silver nanoparticles MWNT Dopamine Antibacterialproperty

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InfoMat 2020年第3期2卷 593-600页

作者： Lixing Kang Xuechao Yu Xiaoxu Zhao Qingling Ouyang Jun Di Manzhang Xu dan Tian Weiliang Gan Calvin CIAng Shoucong Ning Qundong Fu jiadong Zhou R.G.Kutty Ya Deng Pin Song Qingsheng Zeng Stephen J.Pennycook Jun Shen Ken-T.Yong Zheng Liu School of Materials Science and Engineering Nanyang Technological UniversitySingapore CINTRA CNRS/NTU/THALES Singapore Centre for OptoElectronics and Biophotonics School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore Department of Materials Science and Engineering National University of SingaporeSingapore Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqingChina

In recent years,two-dimensional(2D)ternary materials have attracted wide attention due to their novel properties which can be achieved by regulating their chemical composition with a very great degree of freedom and adjustable ***,as for the precise synthesis of 2D ternary materials,great challenges still lie ahead that hinder their further *** this work,we demonstrated a simple and reliable approach to synthesize 2D ternary-layered BiOCl crystals through a microwave-assisted space-confined process in a short time(<3 minutes).Their ultraviolet(UV)detection performance was analyzed *** photodetectors based on the as-obtained BiOCl platelets demonstrate high sensitivity to 266-nm laser *** responsivity is calculated to be8 A/W and the response time is up to be18 *** the other hand,the device is quite stable after being exposed in the ambient air within 3 weeks and the response is almost unchanged during the *** facile and fast synthesis of single crystalline BiOCl platelets and its high sensitivity to UV light irradiation indicate the potential optoelectronic applications of 2D BiOCl photodetectors.

关键词： 2D materials bismuth oxyhalide microwave synthesis UV photodetector

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畜产品消费结构变化下农民创业对策研究

吉林农业科技学院学报 2018年第4期27卷 56-58,119页

作者：张丹冯家栋吉林农业科技学院经济管理学院吉林132101 不详

畜产品消费结构的变化促使农民必须改变创业思维,重新定位创业方向,本文通过分析吉林省畜产品消费现状,农村现状,提出农民创业应该以畜牧业为主,并提出农户联合创业,农企联合创业,实现规模化养殖,标准化养殖,生态化养殖的对策。

关键词：畜牧业畜产品消费结构农民创业

两个品种小麦对重金属积累、转运及健康风险的差异分析

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分子植物育种 2019年第8期17卷 2742-2748页

作者：秦越华强承魁张明韩佳东曹丹王锋韩波徐州生物工程职业技术学院徐州市现代农业生物技术重点实验室徐州221006

通过田间试验研究了两个小麦品种各部位对As、Hg、Ni和Cd累积特性,并用目标危害系数(THQ)法分析了其食用后可能产生的健康风险。结果表明,试验地表层土壤中As、Ni和Cd平均含量较中国土壤元素背景值分别超标1.34倍、0.45倍和1.87倍,而Hg... 详细信息

通过田间试验研究了两个小麦品种各部位对As、Hg、Ni和Cd累积特性,并用目标危害系数(THQ)法分析了其食用后可能产生的健康风险。结果表明,试验地表层土壤中As、Ni和Cd平均含量较中国土壤元素背景值分别超标1.34倍、0.45倍和1.87倍,而Hg低于该值,但所测的重金属含量均低于《土壤环境质量标准》Ⅱ级标准值和《绿色食品产地环境质量》中土壤污染物含量限值。供试的2个小麦品种籽粒和根、茎、叶中的4种被测重金属含量均分别符合国家食品安全标准限制值和有机肥料中重金属限量要求。As和Cd主要积累在根部,Hg仅见叶部,但总体上徐麦30的富集、转运重金属的能力大于保麦2号。其THQ和TTHQ值均小于1.0,表明食用供试小麦籽粒无被测重金属引起的潜在健康风险,但食用徐麦30籽粒的风险相对大于保麦2号。综合分析,保麦2号更适宜在重金属污染土壤上推广种植。

关键词：重金属小麦品种富集转运健康风险

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带环形刚性隔板和基础隔震储液罐的动力响应

噪声与振动控制 2019年第6期39卷 159-163,193页

作者：王成龙王佳栋孙保苍王丹江苏大学土木工程与力学学院江苏镇江212001 解放军陆军工程大学南京210007

为了研究带环形刚性隔板和基础隔震的储液罐在地震激励下的动力响应,首先基于流体子域法求得带刚性隔板圆柱形储液罐中流体晃动的固有频率和模态。引入时变广义坐标,利用分离变量法和振型叠加原理得到各子域内流体速度势函数的解。将流... 详细信息

为了研究带环形刚性隔板和基础隔震的储液罐在地震激励下的动力响应,首先基于流体子域法求得带刚性隔板圆柱形储液罐中流体晃动的固有频率和模态。引入时变广义坐标,利用分离变量法和振型叠加原理得到各子域内流体速度势函数的解。将流体速度势函数代入自由液面方程,利用流体自由晃动模态的正交性和达朗贝尔原理,建立带环形刚性隔板和基础隔震的圆柱形储液罐在水平激励下的动力响应方程。地震响应结果表明,当隔震支座周期较小时,隔震支座接近于刚性,带环形刚性隔板和基础隔震的圆柱形储液罐的动力响应结果和无隔震时的结果基本吻合,验证了该动力响应方程的正确性,并详细讨论了隔震支座和隔板的参数对整个系统动力响应的影响。

关键词：振动与波流-固耦合刚性隔板基础隔震地震响应储液罐流体晃动