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Superhydrophobic and corrosion-resistant siloxane-modified MgAl-LDHs coatings on magnesium alloy prepared under mild conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 450-463页

作者： Wenxi zhang zhangzelong zhuo Dan Xu Liang Wu Zhihui Xie Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg *** composite comprised a tungstate-intercalated(LDH-W)underlayer that was grown at low temperature(relative to hydrothermal reaction conditions)under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane(PFDTMS)using a simple immersion *** successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,and X-ray photoelectron spectroscopy(XPS).The corrosion resistance of the LDH-W film,both before and after the PFDTMS modification,was evaluated using electrochemical impedance spectroscopy(EIS),Tafel curves,and immersion *** results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDHW film,with no apparent signs of corrosion after exposure to 3.5wt%NaCl solution for 15 ***,the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages,as confirmed by static contact angle and water-repellency *** results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.

关键词： Mg alloy corrosion coating layered double hydroxide

激光诱导荧光技术与地下水重金属原位检测应用进展

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岩矿测试 2025年第1期44卷 19-34页

作者：毛康薛家奇陈卓张华中国科学院地球化学研究所环境地球化学国家重点实验室贵州贵阳550081

对地下水重金属污染进行现场检测,是快速识别重金属种类和评价污染程度的重要手段。激光诱导荧光技术(LIF)利用特定荧光探针,在目标重金属存在下,通过激光诱导荧光探针产生/猝灭荧光,从而完成对重金属的识别和检测,具有快速甄别地下水... 详细信息

对地下水重金属污染进行现场检测,是快速识别重金属种类和评价污染程度的重要手段。激光诱导荧光技术(LIF)利用特定荧光探针,在目标重金属存在下,通过激光诱导荧光探针产生/猝灭荧光,从而完成对重金属的识别和检测,具有快速甄别地下水重金属污染特性和无损获取其价态的优势。本文在简述LIF检测重金属原理和LIF原位检测地下水重金属装备基础上,重点从荧光探针合成及其在重金属传感检测方法的构建上总结了基于不同荧光探针的LIF现场检测重金属的研究进展。目前可用于重金属检测的荧光探针包括以小分子探针、有机大分子和聚集诱导发光为主的有机荧光探针和以金纳米簇、量子点和金属有机框架材料为代表的纳米荧光探针。这些探针的合成及其对应的传感检测方法的构建表明LIF技术在地下水重金属检测中具有巨大优势。而针对地下水重金属检测的LIF设备研发方面的成果虽不如荧光传感检测方法丰富,但已研制出部分重金属的传感器和检测装备,表现出良好的应用前景。未来研究将会聚焦在地下水重金属主控因子识别和抗干扰技术研发、荧光探针合成与LIF检测方法构建、重金属传感部件和检测装备集成研制,以及检测技术标准化,为后续场地地下水典型重金属LIF检测技术的研究提供参考。

关键词：地下水重金属激光诱导荧光荧光探针现场检测

Berry-Esseen bounds for self-normalized sums of locally dependent random variables

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Science China Mathematics 2024年第11期67卷 2629-2652页

作者： zhuo-Song zhang Department of Statistics and Data Science Southern University of Science and TechnologyShenzhen 518055China

The Berry-Esseen bound provides an upper bound on the Kolmogorov distance between a random variable and the normal *** this paper,we establish Berry-Esseen bounds with optimal rates for self-normalized sums of locally dependent random variables,assuming only a second-moment *** proof leverages Stein's method and introduces a novel randomized concentration inequality,which may also be of independent interest for other *** main results have applied to self-normalized sums of m-dependent random variables and graph dependency models.

关键词： Berry-Esseen bounds self-normalized sums local dependence m-dependence graph dependency

Fuzzy Support Vector Machine Based on Color Modeling for Facial Complexion Recognition in Traditional Chinese Medicine

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Chinese Journal of Electronics 2016年第3期25卷 474-480页

作者： zhang Jing zhang Pei zhuo Li Signal and Information Processing Laboratory Beijing University of Technology

Face diagnosis is one of the four diagnostic methods in Traditional chinese medicine(TCM). The morbidity of the organs can be revealed from the facial complexion. Due to the ambiguity of face diagnosis in TCM,Fuzzy support vector machine(FSVM) is utilized to remove the influence of outliers. The facial complexion recognition in TCM based on FSVM is proposed in this paper,which includes the following steps: 1) The facial cheek region are segmented as skin blocks; 2) The color feature in Lab color space is extracted from skin block to represent facial complexion characteristic; 3) The fuzzy membership is calculated to obtain the membership of the training samples, in which the final membership of training samples is determined by combining membership calculation based on distance with the facial complexion recognition based on color modeling; 4) The FSVM is built to classify facial complexion characteristic. Experimental results show that proposed facial complexion recognition has better antiinterference performance as well as a higher recognition rate up to 82%.

关键词： Traditional chinese medicine(TCM) Facial complexion recognition Fuzzy support vector machine(FSVM) Color modeling Fuzzy membership

Quality-Aware User Recruitment Based on Federated Learning in Mobile Crowd Sensing

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Tsinghua Science and Technology 2021年第6期26卷 869-877页

作者： Wei zhang zhuo Li Xin Chen Beijing Key Laboratory of Internet Culture and Digital Dissemination Research and School of Computer ScienceBeijing Information Science and Technology UniversityBeijing 100101China School of Computer Science Beijing Information Science and Technology UniversityBeijing 100101China

With the rapid development of mobile devices,the use of Mobile Crowd Sensing(MCS)mode has become popular to complete more intelligent and complex sensing ***,large-scale data collection may reduce the quality of sensed ***,quality control is a key problem in *** the emergence of the federated learning framework,the number of complex intelligent calculations that can be completed on mobile devices has *** this study,we formulate a quality-aware user recruitment problem as an optimization *** predict the quality of sensed data from different users by analyzing the correlation between data and context information through federated ***,the lightweight neural network model located on mobile terminals is *** on the prediction of sensed quality,we develop a user recruitment algorithm that runs on the cloud platform through terminal-cloud *** performance of the proposed method is evaluated through *** show that compared with existing algorithms,i.e.,Random Adaptive Greedy algorithm for User Recruitment(RAGUR)and Context-Aware Tasks Allocation(CATA),the proposed method improves the quality of sensed data by 23.5%and 38.8%,respectively.

关键词： crowd sensing federated learning quality aware user recruitment

RNA-primed allele-specific PCR

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Science China Chemistry 2014年第7期57卷 961-965页

作者： zhang LingHui TANG zhuo Natural Products Research Center Chengdu Institute of Biology Chinese Academy of Sciences University of Chinese Academy of Sciences

RNA/DNA primer pairs and two polymerases were used to efficiently amplify DNA sequences using the conventional polymerase chain reaction(PCR).The reaction required the use of both DNA polymerase and reverse transcriptase during each thermal cycle and formed a double-stranded DNA in which one terminus was an RNA/DNA *** there is a higher sensitivity of the DNA polymerase to the mismatch at the 3?-end in the RNA/DNA hybrid duplex than in the DNA/DNA duplex,the RNA-primed PCR reveals much better specificity in the allele-specific PCR to detect single-nucleotide mutation.

关键词： RNA primer Vent(exo-) DNA polymerase TaqM1 DNA polymerase allele-specific PCR single-nucleotide mutation

Research Progress of Structure Based Antitumor Drug Design

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Chinese Journal of Structural Chemistry 2020年第12期39卷 2085-2090,2053页

作者： zhang Lei CHEN zhuo State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China

At present,the development of antineoplastic drugs has been highly *** strategies have been developed to explore the safety and effectiveness of antitumor *** recent years,the progress of structural analysis of tumor-associated proteins provides a solid foundation for the design of new targeted drugs through efficient prediction and screening *** this review,we briefly summarize the research and development of new antitumor drugs based on structure to enhance tumor targeting property and reduce side effects.

关键词： structure drug design antitumor

Embracing the age of artificial intelligence:paradigm shifts,opportunities,and challenges in the treatment of acute graft-versus-host disease after allogeneic hematopoietic stem cell transplantation

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Science China(Life Sciences) 2024年第6期67卷 1302-1304页

作者： zhuo-Yu An Xiao-Hui zhang Peking University People’s Hospital Peking University Institute of HematologyBeijing 100044China Collaborative Innovation Center of Hematology Peking UniversityBeijing 100044China Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation Beijing 100044China National Clinical Research Center for Hematologic Disease Beijing 100044China

Allogeneic hematopoietic stem cell transplantation(allo-HSCT)is an important medical development in treating hematological ***,the risk of acute graft-versus-host disease(a GVHD)severely limits its use.a GVHD is a sev... 详细信息

关键词： hematopoietic graft artificial

Batroxobin inhibits astrocyte activation following nigrostriatal pathway injury

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Neural Regeneration Research 2021年第4期16卷 721-726页

作者： zhuo zhang Xue Bao Dan Li Department of Human Anatomy College of Basic Medical SciencesChina Medical UniversityShenyangLiaoning ProvinceChina

Batroxobin is a thrombin-like serine protease from the venom of the Bothrops atrox and Bothrops moojeni snake *** 1(Sirt1)has been shown to play an important role in neuroprotection after traumatic brain ***,its underlying mechanism of action remains poorly *** purpose of this study was to investigate whether the mechanism by which batroxobin participates in the activation of astrocytes is associated with *** models of nigrostriatal pathway injury were *** after modeling,mice were intraperitoneally administered 39 U/kg *** significantly reduced the expression of cleaved caspase-3 in both the substantia nigra and striatum,inhibited neuronal apoptosis,and promoted the recovery of rat locomotor *** changes coincided with a remarkable reduction in astrocyte *** also reduced Sirt1 expression and extracellular signal-regulated kinase activation in brain *** administration of the Sirt1-specific inhibitor EX527(5 mg/kg)30 minutes prior to injury could inhibit the abovementioned *** mouse astrocyte cultures,1 ng/mL batroxobin attenuated interleukin-1β-induced activation of astrocytes and extracellular signal-regulated ***527 could also inhibit the effects of *** findings suggest that batroxobin inhibits astrocyte activation after nigrostriatal pathway injury through the Sirt1 *** study was approved by the Animal Ethics Committee of China Medical University,China(approval ***2020037)on July 19,2015.

关键词： astrocyte brain central nervous system factor injury pathway