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Machine Learning‑Enhanced Flexible Mechanical Sensing

Nano-Micro Letters 2023年第4期15卷 190-222页

作者： Yuejiao Wang Mukhtar Lawan Adam Yunlong zhao Weihao Zheng Libo Gao Zongyou Yin Haitao zhao Applied Mechanics Laboratory Department of Engineering MechanicsTsinghua UniversityBeijing 100084People’s Republic of China Materials Interfaces Center Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China department of Mechanical and Electrical Engineering Xiamen UniversityXiamen 361102People’s Republic of China School of Mechano‑Electronic Engineering Xidian UniversityXi’an 710071People’s Republic of China Research School of Chemistry Australian National UniversityCanberraACT 2601Australia

To realize a hyperconnected smart society with high productivity,advances in flexible sensing technology are highly ***,flexible sensing technology has witnessed improvements in both the hardware performances of sensor devices and the data processing capabilities of the device’s *** research efforts have been devoted to improving materials,sensing mechanism,and configurations of flexible sensing systems in a quest to fulfill the requirements of future ***,advanced data analysis methods are being developed to extract useful information from increasingly complicated data collected by a single sensor or network of *** learning(ML)as an important branch of artificial intelligence can efficiently handle such complex data,which can be multi-dimensional and multi-faceted,thus providing a powerful tool for easy interpretation of sensing *** this review,the fundamental working mechanisms and common types of flexible mechanical sensors are firstly *** how ML-assisted data interpretation improves the applications of flexible mechanical sensors and other closely-related sensors in various areas is elaborated,which includes health monitoring,human-machine interfaces,object/surface recognition,pressure prediction,and human posture/motion ***,the advantages,challenges,and future perspectives associated with the fusion of flexible mechanical sensing technology and ML algorithms are *** will give significant insights to enable the advancement of next-generation artificial flexible mechanical sensing.

关键词： Flexible mechanical sensors Machine learning Artificial intelligence Data processing

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Hydrogen-induced delayed fracture of Cu-containing high-strength bolt steel

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Journal of Iron and Steel Research International 2023年第2期30卷 375-383页

作者： Xiao-li zhao Cheng-xiang Zhang Yong-jian Zhang Wei-jun Hui Xiu-ming zhao Materials Science and Engineering Research Center School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing100044China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing211167JiangsuChina

The hydrogen-induced delayed fracture(HIDF)behavior of a 1300-MPa-grade high-strength bolt steel 42CrMoV containing 0.42 wt.%Cu was investigated by constant load tensile test in a pH 3.5 Walpole *** is shown that the addition of Cu is beneficial to enhance the HIDF resistance by~13%.The observation of the fracture surface revealed that the area fraction of brittle crack initiation zone decreased remarkably for the Cu-added *** the corrosion pit depth and the corrosion rate of the Cu-added steel in the Walpole solution are notably decreased,which is primarily because of the formation of a Cu-rich protective compact rust layer and slightly higher corrosion *** a result,the absorbed hydrogen content in that solution was also decreased by~21%.It is concluded that the improvement in the HIDF resistance of the tested steel is primarily due to the increase in corrosion resistance and resultant decrease in the absorbed diffusible hydrogen content in the acidic condition.

关键词： Hydrogen-induced delayed fracture Hydrogen embrittlement High-strength bolt steel Copper Corrosion

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一种新的红外与可见光图像融合与跟踪方法

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光电工程 2005年第2期32卷 37-40,92页

作者：赵鹏浦昭邦张田文哈尔滨工业大学自动化测量与控制系黑龙江哈尔滨150001 哈尔滨工业大学计算机科学与工程系黑龙江哈尔滨150001

多传感器图像融合技术在目标检测与跟踪领域中有广泛应用。提出了一种红外与可见光图像的新颖的特征级融合与运动目标跟踪方法。将目标轮廓用动态轮廓线表示,在目标跟踪过程中对于两类模式图像中的目标轮廓控制点向量,利用 B 样条形状... 详细信息

多传感器图像融合技术在目标检测与跟踪领域中有广泛应用。提出了一种红外与可见光图像的新颖的特征级融合与运动目标跟踪方法。将目标轮廓用动态轮廓线表示,在目标跟踪过程中对于两类模式图像中的目标轮廓控制点向量,利用 B 样条形状空间模型将目标轮廓的特征级融合转换为控制点向量差的 L2 范数平方极小化。这种方法不需要图像配准,降低了融合的计算复杂度。同时,使用了自适应 Kalman 滤波技术,提高了动态轮廓线特征搜索的准确性。对比跟踪实验表明,融合后可见光图像的平均跟踪误差减小了 56.96%。

关键词：图像融合视觉跟踪卡尔曼滤波动态轮廓线

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Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1183-1191页

作者： Jian-zheng Song Zi-yang zhao Xin zhao Rui-dong Fu Shu-min Han State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China College of Environmental and Chemical Engineering Yanshan University Qinhuangdao 066004 China

To improve the hydrogen storage properties of Mg-based alloys, a composite material of MgH_2 + 10wt%LaH_3 + 10wt%NbH was prepared by a mechanical milling method. The composite exhibited favorable hydrogen desorption properties, releasing 0.67wt% H2 within 20 min at 548 K, which was ascribed to the co-catalytic effect of LaH_3 and NbH upon dehydriding of MgH_2. By contrast, pure MgH_2, an MgH_2 + 20wt%LaH_3 composite, and an MgH_2 + 20wt%NbH composite only released 0.1wt%, 0.28wt%, and 0.57wt% H2, respectively, under the same conditions. Analyses by X-ray diffraction and scanning electron microscopy showed that the composite particle size was small. Energy-dispersive X-ray spectroscopic mapping demonstrated that La and Nb were distributed homogeneously in the matrix. Differential thermal analysis revealed that the dehydriding peak temperature of the MgH_2 + 10wt%LaH_3 + 10wt%NbH composite was 595.03 K, which was 94.26 K lower than that of pure MgH_2. The introduction of LaH_3 and NbH was beneficial to the hydrogen storage performance of MgH_2.

关键词： energy storage materials hydrogen absorbing materials mechanical milling phase transformation activation analysis

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The Establishment and Spatiotemporal History of A Novel HIV-1 CRF01_AE Lineage in Shenyang City, Northeastern China in 2002–2019

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Virologica Sinica 2021年第6期36卷 1668-1672页

作者： Minghui An Wei Song Bin zhao Xue Dong Lin Wang wen Tian Xin Li Lu Wang Zhenxing Chu Junjue Xu Haibo Ding Xiaoxu Han Hong Shang NHC Key Laboratory of AIDS Immunology(China Medical University) National Clinical Research Center for Laboratory MedicineThe First Affiliated Hospital of China Medical UniversityShenyang 110001China Key Laboratory of AIDS Immunology Chinese Academy of Medical SciencesShenyang 110001China Key Laboratory of AIDS Immunology of Liaoning Province Shenyang 110001China department of Food Safety and Nutrition Shenyang Center for Health Service and Administration Law Enforcement(Shenyang Center for Disease Control and Prevention)Shenyang 110001China

dear Editor,In China,HIV-1 CRF01_AE has always been one of the most prevalent subtypes,especially among sexually active population,since it was initially reported in Yunnan and Guangxi Provinces during the early 1990s(Cheng et al.1994;Yu et al.1998;Chen et al.1999).Multiple independent introductions of CRF01_AE have led to the establishment of at least eight epidemic lineages in China,which have been circulating among different high-risk populations and have variable prevalence and geographic distribution(Li et al.2017).

关键词： History initially eastern

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One-step Synthesis of Shape-controllable Gold Nanoparticles and Their Application in Surface-enhanced Raman Scattering

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Journal of Materials Science & Technology 2013年第7期29卷 613-618页

作者： Lanlan Sun Dongxu zhao Meng Ding Haifeng zhao Zhenzhong Zhang Binghui Li dezhen Shen State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences

Gold nanoparticles （NPs） of various shapes were synthesized by a one-step method at ambient temperature in the presence of NaCl. 2-mercaptosuccinic acid （MSA） was used as both reducing agent and stabilizing agent. The shapes of gold NPs were controllable by simply tuning S/Au ratio （S is from MSA molecule, and S/Au ratio is controlled by tuning the volume of added MSA solution）, and triangle, polygonal and spherical nanoparticles were obtained. This result suggested a new way to consider the effects of MSA on the growth of nanoparticles, which showed that MSA is a strong capping agent and facilitates more uniform growth of nanoparticles in every dimension. And other important factors on nanoparticles growth including NaCl and temperature were discussed. Furthermore, a typical probe molecule, 4-aminothiophenol （4-ATP） was used to test the surface-enhanced Raman scattering （SERS） activity of these gold NPs and the results indicated good Raman activity on these substrates. And the enhancement factor （EF） at 1078 cm^- 1 （a1） was estimated to be as large as 6.3 × 10^4 and 5.5 × 10^4 for triangular plates and truncated particles, respectively.

关键词： Nanoparticle Shape Controlled synthesis Surface-enhanced Raman scattering (SERS)

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Gradient-structure-enhanced dielectric energy storage performance of flexible nanocomposites containing controlled preparation of defective TiO_(2) and ferroelectric KNbO_(3) nanosheets

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Nano Research 2024年第5期17卷 4079-4088页

作者： Yan Wang Lili zhao Ruicong Chen wenhui zhao dengwei Hu Haoran Wang Bin Cui Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education Shaanxi Key Laboratory of Physico–Inorganic Chemistry Xi’an Key Laboratory of Functional Supramolecular Structure and MaterialsCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an 710127China School of Information Science and Technology Northwest UniversityXi’an 710127China Engineering Research Center for Titanium Based Functional Materials and devices in Universities of Shaanxi Province Faculty of Chemistry and Chemical EngineeringBaoji University of Arts and SciencesBaoji 721013China

Next generation power system needs dielectrics with increased dielectric energy ***,the low energy density of dielectrics limits their ***,an asymmetric trilayered nanocomposite,with a transition layer(TL),an insulation layer(IL),and a polarization layer(PL),is designed based on poly(vinylidene fluoride)-polymethyl methacrylate(PVDF-PMMA)matrix using KNbO_(3)(KN)and TiO_(2)(TO)as the *** morphology and defect control of the two-dimensional nano KN and nano TO fillers are realized via a hydrothermal method to increase the composite breakdown strength(E_(b))and the composite energy density(U_(e)).The asymmetric trilayered structure leads to a gradient electric field distribution,and the KN and TO nanosheets block charges transfer along z *** a result,the development path of the electrical trees is greatly curved,and E_(b) is effectively *** the Ue value of the nanocomposites reaches 17.79 J·cm^(-3) at 523 MV·m^(-1).On the basis,the composite Ue is further improved by defect control in TO *** nanocomposite KN/TO/PVDF-PMMA containing TO with less oxygen vacancy concentration(calcined at oxygen atmosphere)acquires a high Ue of 21.61 J·cm^(-3) at 548 MV·m^(-1).This study provides an idea for improving the energy storage performance by combining the design of the composite dielectric structure and the control of nanofillers’defect and morphology.

关键词： asymmetric trilayered structure two-dimensional energy density oxygen vacancies breakdown strength dielectric

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Robust, breathable, and chemical-resistant polytetrafluoroethylene (PTFE) films achieved by novel in-situ fibrillation strategy for highperformance triboelectric nanogenerators

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Nano Research 2024年第3期17卷 1942-1951页

作者： Jialong Chai Guilong Wang Jinchuan zhao Guizhen Wang Chao Wei Aimin Zhang Guoqun zhao Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061China Key Laboratory of Chinese Education Ministry for Tropical Biological Resources Hainan UniversityHaikou 570228China

In the era of advanced wearable electronic devices,the triboelectric nanogenerators(TENGs)as energy harvesting and self-powered sensing units hold great *** appropriate triboelectric material is the crucial factor to optimize the performance of TENG,while polytetrafluoroethylene(PTFE)stands out as a highly versatile option among the various *** this study,we present an ultrafine nanofibrous PTFE(NF-PTFE)films prepared by novel in-situ fibrillation strategy as the triboelectric material in TENG *** innovative processing methodology facilely addresses the dilemma between high porosity and fine pore size of traditional porous PTFE films,meanwhile achieves exceptional mechanical strength,hydrophobicity,air permeability,and chemical resistance of the *** the integration of nanofibrous PTFE films into contact-separation mode TENG and droplet-based TENG,these devices realize the peak electrical output of 131 V/10.8μA and 54 V/14μA with great durability,which surpass the performance of TENGs using traditional expanded PTFE ***,a smart glove capable of recognizing hand gestures is proposed,which demonstrates the versatility,flexibility,and practicality of this material for potential use in smart *** reported NF-PTFE film provides insights for the design of high-performance TENG device for advanced wearable electrical applications.

关键词： polytetrafluoroethylene(PTFE) nanofibrous film hydrophobic triboelectric nanogenerator self-powered sensor

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Identification of Residue Involved in Nucleotidyltransferase Activity of LinA from Staphylococci by Site-directed Mutagenesis

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Chinese Journal of Structural Chemistry 2019年第3期38卷 422-428页

作者： ZOU Xiao-Ming JIANG Mei-Qin zhao Yan-He SUN Li-Fang YANG wen-Di YE Xian-Ren WU Yun-Kun State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences department of Cell Biology and Biophysics University of Texas Southwestern Medical Center Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation College of Life Science Fujian Normal University Fujian Cancer Hospital & Fujian Medical University Cancer Hospital

The lincosamide class of antibacterials is widely used for the treatment of a broad spectrum of infections, and one prevalent route of resistance to lincosamides in pathogenic gram-positive cocco is antibiotic modification. Enzymes encoded by lin genes, belonging to nucleotidyltransferase superfamily, catalyze adenylylation to inactivate lincosamides. LinA can adenylylate lincosamides at either 3?-or 4?-OH of the methylthiolincosamide sugar. The crystal structure of LinA/lincomycin has confirmed its active site. However, the residue interacting with nucleotidyl donors remains elusive. Here, we modeled the complex structure of LinA/lincomycin/Mg^(2+)/AMPCPP to reveal a putative pocket for nucleotidyl donors and suggested the residue R45 in this pocket involved in the recognition of donor substrates NTP and catalysis. ITC and enzyme activity assays show that the mutation of residue R45 impairs LinA nucleotidyltransferase activity in vitro. This work provides insights into the molecular mechanism of the nucleotide binding and transferring activity of antibiotic NTases.

关键词： LinA nucleotidyltransferase site-directed mutagenesis enzymatic assay ITC

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Isolation and Characterization of a Thermophilic Oil-degrading Bacterial Consortium

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China Petroleum Processing & Petrochemical Technology 2013年第2期15卷 82-90页

作者： Gu Guizhou Li Zheng zhao Dongfeng zhao Chaocheng College of Chemical Engineering China University of Petroleum College of Environmental Science and Engineering Liaoning Shihua University

In this study, a thermophilic oil-degrading bacterial consortium KO8-2 growing within the temperature range of 45--65℃ （with 55℃ being the optimum temperature） was isolated from oil-contaminated soil of Karamay in Xinjiang, China. denaturing gradient gel electrophoresis （DGGE） showed that there were nine strains included in KO8-2, which originated from the genera of Bacillus, Geobacillus and Clostridium. They all belonged to thermophilic bacteria, and had been previously proved as degraders of at least one petroleum fraction. The crude oil degraded by KO8-2 was analyzed by infrared spectrophotometry, hydrocarbon group type analysis and gas chromatography. The results indicated that the bacterial consortium KO8-2 was able to utilize 64.33% of saturates, 27.06% of aromatics, 13.24% of resins and the oil removal efficiency reached up to 58.73% at 55 ~C when the oil concentration was 10 g/L. detailed analysis showed that KO8-2 was able to utilize the hydrocarbon components before C19, and the n-alkanes ranging from C20--C33 were signifi- cantly degraded. The ratios of nC17/Pr and nC18/Ph were 3.12 and 3.87, respectively, before degradation, whereas after degradation the ratios reduced to 0.21 and 0.38, respectively. Compared with the control sample, the oil removal efficiency in KO8-2 composting reactor reached 50.12% after a degradation duration of 60 days.

关键词： thermophilic bacteria bacterial consortium oil-contaminated soil biodegradation DGGE

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