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Infrared nanoimaging of nanoscale sliding dislocation of collagen fibrils

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Nano Research 2022年第3期15卷 2355-2361页

作者： Zhi qiao Mengfei Xue Yongqian Zhao Yindong Huang Ming Zhang Chao Chang Jianing Chen Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic Science and EngineeringXi'an Jiaotong UniversityXi’an 710049China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijing 100071China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter PhysicsBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Neurobiology Collaborative Innovation Center for Brain Science and Shaanxi Key Laboratory of Brain DisordersSchool of Basic MedicineFourth Military Medical UniversityXi’an 710032China Songshan Lake Materials Laboratory Dongguan 523808China

Collagen,one of the major components in the mammalian connective tissues,plays an essential role in many vital physiological *** common diseases,such as fibrosis,overuse injuries,and bone fracture,are associated with collagen arrangement ***,the underlying mechanism of collagen arrangement defects remains *** this study,we applied infrared scattering-type scanning near-field optical microscopy to study collagen fibrils’structural ***,we observed two types of collagen fibrils’arrangement with different periodic characteristics.A crystal sliding model was employed to explain this observation *** results suggest that the collagen dislocation propagates in collagen fibrils,which may shed light on many collagen diseases’*** findings help to understand the regulation mechanism of hierarchical biological structure.

关键词： scattering near-field optical microscopy collagen fibrils dislocation D periodicity

Atomically precise alkynyl-protected Ag_(20)Cu_(12)nanocluster:Structure analysis and electrocatalytic performance toward nitrate reduction for NH_(3)synthesis

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Nano Research 2023年第8期16卷 10867-10872页

作者： Guanyu Ma Fang Sun Liang qiao Quanli Shen Lei Wang Qing Tang Zhenghua Tang New Energy Research Institute School of Environment and EnergySouth China University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou 510006China School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Theoretical and Computational ChemistryChongqing UniversityChongqing 401331China China Petrochemical Research Institute PetroChina Company LimitedBeijing 102206China

Electrochemical nitrate reduction reaction(NtrRR)has been emerging as an appealing route for both water treatment and NH_(3)***,we report the structure analysis and electrocatalytic performance of a novel homoleptic alkynyl-protected Ag_(20)Cu_(12)nanocluster(Ag_(20)Cu_(12)in short)with atomic precision,which has eight free electrons and displays characteristic absorbance *** crystal X-ray diffraction(SC-XRD)discloses that,it adopts a Ag_(14)kernel capped by three Ag_(2)Cu_(4)(C≡CArF)_(8)metal–ligand binding motifs in the outer ***_(20)Cu_(12)exhibited excellent catalytic performance toward NtrRR,as manifested by the superior NH_(3)Faradaic efficiency(FE,84.6%)and yield rate(0.138 mmol·h^(−1)·mg−1)than the homoleptic alkynyl-protected Ag_(32)***,it demonstrates good catalytic recycling *** functional theory(DFT)calculations revealed that,the de-ligated Ag_(20)Cu_(12)cluster can expose the available AgCu bimetallic sites as the efficient active sites for NH_(3)*** particular,the participation of Cu sites greatly facilitates the initial capture of NO_(3)−and simultaneously promotes the selectivity of the final *** study discovers a novel homoleptic alkynyl-protected AgCu superatom,and offers a great example to elucidate the structure–performance relationship of bimetallic catalyst for NtrRR and other multiple protons/electrons coupled electrocatalytic reactions.

关键词： Ag_(20)Cu_(12)nanocluster alkynyl ligand nitrate reduction reaction(NtrRR) ammonia synthesis density functional theory(DFT)calculations

Microstructure controlled synthesis of Ni,N-codoped CoP/carbon fiber hybrids with improving reaction kinetics for superior sodium storage

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Journal of Materials Science & Technology 2022年第4期99卷 184-192页

作者： Huijun Li Xiaomin Wang Zhenxin Zhao Rajesh Pathak Siyue Hao Xiaoming Qiu Qiquan qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of New Energy Materials and Devices Taiyuan University of TechnologyTaiyuan 030024China Department of Electrical Engineering and Computer Science Center for Advanced Photovoltaics and Sustainable EnergySouth Dakota State UniversityBrookingsSD 57007USA Mechanical&Aerospace Engineering Syracuse UniversitySyracuseNY 13244USA

Transition-metal phosphides(TMPs)-based hybrid structure have received considerable attention for efficient sodium storage owing to their high capacity and decent ***,the volume expansion&the poor electronic conductivity of TMPs,the poor-rate capability,and fast capacity decay greatly hinder its practical *** address these issues,a low-cost and facile strategy for the synthesis of Ni,N-codoped graphitized carbon(C)and cobalt phosphide(CoP)embedded in carbon fiber(Ni-CoP@CN⊂CF)as self-supporting anode material is demonstrated for the first *** graphitized carbon and carbon fiber improve the electrical conductivity and inhibit the volume expansion *** addition to that,the microporous structure,and ultrasmall sized Ni-CoP offer a high surface area for electrolyte wettability,short Na-ion diffusion path and fast charge transport *** a result,outstanding electrochemical performance with an average capacity decay of 0.04%cycle^(−1)at 2000 mA g^(−1),an excellent rate capability of 270 mAh g^(−1)@2000 mA g^(−1)and a high energy density of~231.1 Wh kg^(−1)is achieved with binder-free self-supporting anode *** work shows a potential for designing binder-free and high energy density sodium-ion batteries.

关键词： Ultrasmall Ni-CoP Carbon shell Microporous structure High Na^(+)diffusion coefficients Sodium-ion batteries

Collision Classification MAC Protocol for Underwater Acoustic Communication Networks Using Directional Antennas

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China Communications 2022年第5期19卷 241-252页

作者： Jianmin Yang Gang qiao Qing Hu Lingji Xu Peng Xiao Jiarong Zhang School of Ocean Engineering and Technology Sun Yat-sen UniversityGuangzhou 518000China Acoustic Science and Technology Laboratory Harbin Engineer UniversityHarbin 150001China Key Laboratory of Marine Information Acquisition and Security Harbin Engineering UniversityMinistry of Industry and Information TechnologyHarbin 150001China College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China Systems Engineering Research Institute Beijing 100094China

Traditional underwater acoustic communication networks(UACNs)generally use omnidirectional transmission technology that causes a large number of data-packet collisions,thus resulting in low network throughput and high end-to-end *** with omnidirectional transmission technology,directional technology only sends and receives data packets in a specified *** can significantly reduce the probability of collisions and improve network ***,it also causes a deafness problem,which occurs when the sending node sends a data packet to the receiving node but the receiving node is unable to reply to the sender,because its antenna beam is *** resolve this issue,this study proposes a collision classification media access control(CC-MAC)protocol for *** this protocol,the underwater acoustic channel is divided into two subchannels,and the nodes transmit corresponding data types on *** sending node can estimate the current status of the receiving node(i.e.,no collision,normal collision,deafness)according to the type of the data packet received and the sub-channel it arrived on,and it can choose correct options to improve network ***,we verify the performance of CC-MAC via simulations,showing that the protocol achieved higher network throughput and lower end-toend delays.

关键词： collision classification directional antennas dual channel media access control(MAC) underwater acoustic communication networks(UACNs)

基于MXene-MB-cDNA材料构建新型传感器方法用于镉离子检测

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广东化工 2024年第3期51卷 146-149,135页

作者：乔欣罗广林罗珊成婧文茜中南林业科技大学湖南长沙410000 湖南省食品质量监督检验研究院食品安全监测预警重点实验室湖南长沙410000 湖南省长沙海关技术中心湖南长沙410000

本研究中,开发了一种新颖的基于过渡金属碳化物-亚甲基蓝-互补DNA(MXene-MB-cDNA)探针构建的竞争型电化学传感器,可用于重金属镉离子(Cd^(2+))的检测。该传感器一部分是基于MXene片层结构扩大MB负载率,用以放大电化学检测信号;另一部分... 详细信息

本研究中,开发了一种新颖的基于过渡金属碳化物-亚甲基蓝-互补DNA(MXene-MB-cDNA)探针构建的竞争型电化学传感器,可用于重金属镉离子(Cd^(2+))的检测。该传感器一部分是基于MXene片层结构扩大MB负载率,用以放大电化学检测信号;另一部分以电极上修饰的Cd^(2+)Apt做为纽带连接MXene-MB-cDNA。当Cd^(2+)存在时,与cDNA竞争性结合Apt,引起双链结构变化,产生电化学信号,其最低检测限达到0.0034 mg·L^(-1),并在0.01至1.6 mg·L^(-1)范围内呈现良好的线性关系(R2=0.991)。相较传统方法,该方法更简单灵敏,为环境保护、食品安全、生物医药等研究方向中镉离子的检测提供了新的思路。

关键词：镉离子电化学传感过渡金属碳化物适配体

Atomically precise Au_(25)(GSH)_(18)nanoclusters versus plasmonic Au nanocrystals:Evaluating charge impetus in solar water oxidation

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Chinese Chemical Letters 2023年第6期34卷 195-199页

作者： qiao-Ling Mo Xiao-Cheng Dai Yang Xiao Fang-Xing Xiao College of Materials Science and Engineering Fuzhou UniversityNew CampusMinhou 350108China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

Atomically precise metal nanoclusters(NCs)have been deemed as an emerging class of metal nanomaterials owing to fascinating size-dependent physicochemical properties,discrete energy band structure,and quantum confinement effect,which are distinct from conventional metal nanoparticles(NPs).Nevertheless,metal NCs suffer from photoinduced self-oxidative aggregation accompanied by in-situ transformation to metal NPs,markedly reducing the photosensitization of metal ***,maneuvering the generic instability of metal NCs,we perform the charge transport impetus comparison between atomically precise metal NCs and plasmonic metal NPs counterpart obtained from in-situ self-transformation of metal NCs in photoelectrochemical(PEC)water splitting *** conceptual demonstration,we proposed two quintessential heterostructures,which include TNTAs-Au_(25)heterostructure fabricated by electrostatically depositing glutathione(GSH)-protected Au_(25)(GSH)_(18)NCs on the TiO_(2)nanotube arrays(TNTAs)substrate,and TNTAs-Au heterostructure constructed by triggering self-transformation of Au_(25)(GSH)_(18)NCs to plasmonic Au NPs in TNTAs-Au_(25)via *** results indicate that photoelectrons produced over Au_(25)NCs are superior to hot electrons of plasmonic Au NPs in stimulating the interracial charge transport toward solar water *** is mainly ascribed to the significantly accelerated carrier transport kinetics,prolonged carrier lifespan,and substantial photosensitization effect of Au_(25)NCs compared with plasmonic Au NPs,resulting in the considerably enhanced PEC water splitting performance of TNTAs-Au_(25)relative to plasmonic TNTAs-Au counterpart under visible light *** work would provide important implications for rationally designing atomically precise metal NCsbased photosystems toward solar energy conversion.

关键词： Metal nanoclusters Surface Plasmon resonance Interfacial charge transfer Photoelectrochemical water splitting

Chronic Kidney Disease Induces Cognitive Impairment in the Early Stage

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Current Medical Science 2023年第5期43卷 988-997页

作者： Yu WANG Kai CHEN Zi-xuan qiao Xiao-rong BAO Department of Nephrology Jinshan HospitalFudan UniversityShanghai 201508China

Objective Previous research indicates a link between cognitive impairment and chronic kidney disease(CKD),but the underlying factors are not fully *** study aimed to investigate the progression of CKD-induced cognitive impairment and the involvement of cognition-related proteins by developing early-and late-stage CKD models in Sprague-Dawley *** The Morris water maze test and the step-down passive avoidance task were performed to evaluate the cognitive abilities of the rats at 24 weeks after *** examinations were conducted to examine renal and hippocampal ***-time PCR,Western blotting analysis,and immunohistochemical staining were carried out to determine the hippocampal expression of brain-derived neurotrophic factor(BDNF),choline acetyltransferase(ChAT),and synaptophysin(SYP).Results Compared with the control rats,the rats with early-stage CKD exhibited mild renal damage,while those with late-stage CKD showed significantly increased serum creatinine levels as well as apparent renal and brain *** rats with early-stage CKD also demonstrated significantly impaired learning abilities and memory compared with the control rats,with further deterioration observed in the rats with late-stage ***,we observed a significant downregulation of cognition-related proteins in the hippocampus of rats with early-stage CKD,which was further exacerbated with declining renal function as well as worsening brain and renal damage in rats with late-stage *** These results suggest the importance of early screening to identify CKD-induced cognitive dysfunction *** addition,the downregulation of cognition-related proteins may play a role in the progression of cognitive dysfunction.

关键词： chronic kidney disease cognitive impairment Morris water maze test brain-derived neurotrophic factor choline acetyltransferase synaptophysin

Mapping and Assessing Typhoon-induced Forest Disturbance in Changbai Mountain National Nature Reserve Using Time Series Landsat Imagery

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Journal of Mountain Science 2015年第2期12卷 404-416页

作者： GUO Xiao-yi ZHANG Hong-yan WANG Ye-qiao John Clark School of Geographical Sciences Northeast Normal University Department of Natural Resources Science University of Rhode Island

Monitoring forest disturbances is important for understanding changes in ecosystems. The 1986 Typhoon Vera was a serious disturbance that severely impacted the forest ecosystems of Changbai Mountain National Nature Reserve. Although the typhoon disturbance occurred more than two decades ago, the effects of the typhoon still remain within the study area. Few studies have focused on mapping and assessing disturbances across broad spatial and temporal scales. For this study, we first generated a map of forest composition prior to the typhoon disturbance, which served as a baseline data for the extraction of disturbed area. Then, the Disturbance Index(DI) method was tested for mapping the extent and magnitude of disturbance in the study area by applying a Tasseled Cap transformation to the Landsat imagery. The Landsatbased DI method estimated that an area of 13,764.78 ha of forest was disturbed by the typhoon. Based on visual assessments, these results correspond closely with the reference map derived from ground surveys. These results also revealed the influence of local topographic features on the distribution of windthrow areas. Windthrow areas were more pronounced inareas with elevations ranging from 1,000 to 2,000 m, slopes of less than 10 degrees, and southwestern to northwestern aspects. In addition, the relatively long(25 years) post-typhoon recovery period assessed by this study provided a more comprehensive analysis of the dynamics of forest recovery processes over time. Windthrow areas did not recover immediately after the typhoon, likely due to forest management practices enacted at the time. So far, forest recovery has proceeded more rapidly at elevations below 1,400 m, particularly on western slopes within the study area. Finally, a time series of DI values within the study period suggests a secondary disturbance may have occurred between 2000 and 2001.

关键词： Typhoon Vera Windthrow areas Disturbance Index(DI) Topographic features Forest recovery process

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基于深度模糊神经网络的太阳总辐射预测研究

太阳能学报 2024年第2期45卷 59-64页

作者：乔楠蒋波涛郑雨刘燕东王锦西安工程大学电子信息学院西安710600 西安市电气设备互联感知与智能诊断重点实验室西安710600

提出一种基于深度模糊神经网络的太阳总辐射预测模型。首先利用Pearson相关系数分析太阳总辐射关键影响因素,其次利用深度学习多隐含层所具有的特征提取优势将模糊神经网络模块重复连接,构建深度模糊神经网络模型,并使用蝗虫优化算法对... 详细信息

提出一种基于深度模糊神经网络的太阳总辐射预测模型。首先利用Pearson相关系数分析太阳总辐射关键影响因素,其次利用深度学习多隐含层所具有的特征提取优势将模糊神经网络模块重复连接,构建深度模糊神经网络模型,并使用蝗虫优化算法对其中心值和宽度进行优化。利用所提太阳总辐射预测模型对5个气象站点的相关数据进行仿真实验,并对结果进行分析。仿真结果表明:所提预测模型较其他模型具有较高的预测精度,验证了模型的有效性,可满足无辐射监测站点太阳总辐射预测的需要。

关键词：太阳能太阳辐射预测深度模糊神经网络蝗虫优化算法

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