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Statistical analysis on nanostructure-mechanical property relations for xSiO(2)-(1-x)Al2O3 aluminosilicate glass with voids and inclusions EI SCIE
期刊论文 | 2021 , 47 (21) , 29584-29597 | CERAMICS INTERNATIONAL
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Abstract :

The complex constituent elements and nanoscale structures of a silicate glass material significantly affect its general properties, which challenges the prediction of macroscopic structure-property relations. In this study, a statistical analysis procedure is proposed to establish nanoscale structure-property relations of xSiO(2)-(1-x)Al2O3 aluminosilicate glass. The nanostructural complexities in terms of Al2O3 content as well as type, size and distribution of internal defects are considered by using multiple nanostructure descriptors. Based on principal component analysis (PCA) and polynomial regression, we then establish high dimensional predictive models with simple formulas and high accuracies. Using the developed model, massive data is generated (over 30,000 data points) for a multivariate global sensitivity analysis (GSA). Finally, nanostructural variables influential to the mutually correlated mechanical properties are identified; their individual, interactional and total effects are quantitatively evaluated. The findings of this work not only reveal the complex nanostructure-property relations for the aluminosilicate glass, but also offer a feasible solution to model establishment and GSA performance for a high dimensional system, both of which usually require massive training data and are computationally too expensive.

Keyword :

Silicate glass Global sensitivity analysis Crack propagation Principal component analysis Nanodefects

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GB/T 7714 Wu, Yihan , Yu, Wenshan , Shen, Shengping . Statistical analysis on nanostructure-mechanical property relations for xSiO(2)-(1-x)Al2O3 aluminosilicate glass with voids and inclusions [J]. | CERAMICS INTERNATIONAL , 2021 , 47 (21) : 29584-29597 .
MLA Wu, Yihan 等. "Statistical analysis on nanostructure-mechanical property relations for xSiO(2)-(1-x)Al2O3 aluminosilicate glass with voids and inclusions" . | CERAMICS INTERNATIONAL 47 . 21 (2021) : 29584-29597 .
APA Wu, Yihan , Yu, Wenshan , Shen, Shengping . Statistical analysis on nanostructure-mechanical property relations for xSiO(2)-(1-x)Al2O3 aluminosilicate glass with voids and inclusions . | CERAMICS INTERNATIONAL , 2021 , 47 (21) , 29584-29597 .
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Facilitating electrocatalytic hydrogen evolution via multifunctional tungsten@tungsten disulfide core-shell nanospheres dagger EI SCIE
期刊论文 | 2021 , 9 (14) , 9272-9280 | JOURNAL OF MATERIALS CHEMISTRY A
WoS CC Cited Count: 1
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Abstract :

Transition metal dichalcogenides (TMDs) have long been thought to be alternatives for noble Pt/Ir metals as hydrogen evolution reaction electrocatalysts. However, sparse active sites and poor electrical property, two of the most formidable challenges for their electrocatalytic performance, can hardly be improved just by existing methods. Herein, tungsten (W)@tungsten disulfide (WS2) core-shell nanospheres (CSNSs) were synthesized via one-step laser-assisted strategy. Through introducing multifunctional CSNSs, metallic WS2 hierarchically curves on the W core with a curvature as high as 10(-2) nm(-1) make the interlayer spacing of WS2 broaden significantly and then expose more catalytic sites. Moreover, the electrical conductivity of the electrocatalyst rises 4.5 times via a highly electroconductive W core. The electrochemical surface area of WS2 is also greatly enlarged by forming a 3D nanospheres-aggregated nanoporous van der Waals heterostructure. Calculations indicate that CSNSs contribute to optimizing the hydrogen adsorption Gibbs free energy, and modulating the electronic occupation around the Fermi level. Among these, W sites on the curved shell emerge as the most active catalytic centers. Further experiments demonstrate that W@WS2 CSNSs can therefore exhibit superior catalytic activities featuring a small overpotential of 161 mV at 10 mA cm(-2), an ultralong durability in acids (similar to 100 h) and most importantly, the smallest Tafel slope (34.5 mV dec(-1)) and the biggest electrical double-layer capacitance (62.2 mF cm(-2)) among WS2-based electrocatalysts. This study opens a pathway to develop site-rich and highly electroconductive TMDs, which not only act as high performance water electrolysis catalysts on a large scale, but can also be used for batteries, supercapacitors and electrochemical actuators.

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GB/T 7714 Ji, Liang , Cao, Hongyu , Xing, Wensi et al. Facilitating electrocatalytic hydrogen evolution via multifunctional tungsten@tungsten disulfide core-shell nanospheres dagger [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2021 , 9 (14) : 9272-9280 .
MLA Ji, Liang et al. "Facilitating electrocatalytic hydrogen evolution via multifunctional tungsten@tungsten disulfide core-shell nanospheres dagger" . | JOURNAL OF MATERIALS CHEMISTRY A 9 . 14 (2021) : 9272-9280 .
APA Ji, Liang , Cao, Hongyu , Xing, Wensi , Liu, Shuaicheng , Deng, Qian , Shen, Shengping . Facilitating electrocatalytic hydrogen evolution via multifunctional tungsten@tungsten disulfide core-shell nanospheres dagger . | JOURNAL OF MATERIALS CHEMISTRY A , 2021 , 9 (14) , 9272-9280 .
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Inverse Flexoelectret Effect: Bending Dielectrics by a Uniform Electric Field EI SCIE
期刊论文 | 2021 , 15 (1) | Physical Review Applied
WoS CC Cited Count: 3
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Abstract :

It is highly desirable to discover an electromechanical coupling that allows a dielectric material to generate curvature in response to a uniform electric field, which would help to simplify device design and reduce interface failure in designing actuators. Flexoelectricity, a two-way coupling between polarization and strain gradient, is a good candidate. However, its applications are usually limited to the nanoscale due to its inherent size dependence. Here, an inverse flexoelectret effect in silicone elastomers is introduced to overcome this limitation. On the basis of this idea, a flexing actuator that can generate large curvature at the millimeter length scale is fabricated and shown to have excellent actuation performance, comparable with that of current nanoscale flexoelectric actuators. Theoretical analysis indicates that the phenomenon originates from the interplay of electrets and Maxwell stress. This work opens an avenue for applying macroscopic flexoelectricity in actuators and flexible electronics. © 2021 American Physical Society.

Keyword :

Flexible electronics Electromechanical devices Nanotechnology Dielectric materials Silicones Actuators Electric fields Electromechanical coupling

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GB/T 7714 Wen, Xin , Tan, Kai , Deng, Qian et al. Inverse Flexoelectret Effect: Bending Dielectrics by a Uniform Electric Field [J]. | Physical Review Applied , 2021 , 15 (1) .
MLA Wen, Xin et al. "Inverse Flexoelectret Effect: Bending Dielectrics by a Uniform Electric Field" . | Physical Review Applied 15 . 1 (2021) .
APA Wen, Xin , Tan, Kai , Deng, Qian , Shen, Shengping . Inverse Flexoelectret Effect: Bending Dielectrics by a Uniform Electric Field . | Physical Review Applied , 2021 , 15 (1) .
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Effect of crystallization on the macro and micro residual stress of enamel coating EI SCIE
期刊论文 | 2021 , 41 (6) , 3643-3654 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
WoS CC Cited Count: 1
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Abstract :

In this paper, we investigate microstructural and mechanical properties of enamel coating after different heat treatment periods. The results show that the refractory BaAl2Si2O8, CaAl2Si2O8 and MgCr2O4 crystals precipitate from parent enamel, and crystallization volume fraction reaches saturation at 40 % after heat treatment 32 h. Moreover, from the experimental and theoretical analysis of residual stress, the macro and micro compressive residual stresses increase with increasing the crystallized volume fraction. And, the continuous macro compressive residual stress and small-scale microstructure inhomogeneities could significantly lead to the shear stress concentration near the enamel coating surface, which results in the typical fish-scaling failure of enamel. Meanwhile, we also find that a slit method with geometric phase analysis (GPA) under focused ion beam scanning electron microscopy (FIB/SEM) system could more reliably characterize residual stress of enamel coating because of phase transformation than traditional X-ray diffraction (XRD) method.

Keyword :

Heat treating Enamel coating Crystallization Residual stress Fish-scaling

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GB/T 7714 Yan, Gaosheng , Liu, Wenyuan , Yu, Wenshan et al. Effect of crystallization on the macro and micro residual stress of enamel coating [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2021 , 41 (6) : 3643-3654 .
MLA Yan, Gaosheng et al. "Effect of crystallization on the macro and micro residual stress of enamel coating" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 41 . 6 (2021) : 3643-3654 .
APA Yan, Gaosheng , Liu, Wenyuan , Yu, Wenshan , Shen, Shengping . Effect of crystallization on the macro and micro residual stress of enamel coating . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2021 , 41 (6) , 3643-3654 .
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The impact of flexoelectricity on materials, devices, and physics EI SCIE Scopus
期刊论文 | 2020 , 128 (8) | JOURNAL OF APPLIED PHYSICS | IF: 2.546
WoS CC Cited Count: 7
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Abstract :

In dielectric materials, due to the flexoelectric effect, a large inhomogeneous deformation can break or significantly alter the inversion symmetry of the material and induce net polarization. Such a phenomenon is distinctive comparing to other forms of electromechanical coupling, such as piezoelectricity and electrostriction, in that it is an intrinsic and universal effect whose strength scales up with the decrease in the sample size. Research works in the past decade indicate that the emergence of flexoelectricity not only provides a new way of realizing electromechanical coupling, but also has impact on multiple fields including smart materials, devices, and even physics. Our objective of this perspective is to briefly introduce the field of flexoelectricity and discuss on its future development. Also, current challenges and ambiguities that may impede the further development of the field are pointed out. Furthermore, our opinions on why flexoelectricity matters and how can we use it in novel ways are presented.

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GB/T 7714 Deng, Qian , Lv, Sihao , Li, Zhaoqi et al. The impact of flexoelectricity on materials, devices, and physics [J]. | JOURNAL OF APPLIED PHYSICS , 2020 , 128 (8) .
MLA Deng, Qian et al. "The impact of flexoelectricity on materials, devices, and physics" . | JOURNAL OF APPLIED PHYSICS 128 . 8 (2020) .
APA Deng, Qian , Lv, Sihao , Li, Zhaoqi , Tan, Kai , Liang, Xu , Shen, Shengping . The impact of flexoelectricity on materials, devices, and physics . | JOURNAL OF APPLIED PHYSICS , 2020 , 128 (8) .
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Forced vibration of piezoelectric and flexoelectric Euler–Bernoulli beams by dynamic Green’s functions EI SCIE
期刊论文 | 2020 , 232 (2) , 449-460 | Acta Mechanica | IF: 2.698
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This work presents the dynamic response of piezoelectric and flexoelectric Euler–Bernoulli beams subjected to mechanical loads by means of Green’s functions. Exact solutions in closed form for the electromechanical coupling behaviors are derived. The present solutions will reduce to those of classical piezoelectric beam models by neglecting the flexoelectric effect. Numerical results for a BaTiO 3 cantilever show that the tip deflection of the beam will be separated when the beam thickness reduces to one micrometer; therefore, pure mechanical experiments can be used to determine the flexoelectric effect by a bending test under different electrical boundary conditions. In addition, the dynamic output voltage under open-circuit condition and the dynamic output charge under short-circuit condition are dominated by the flexoelectric effect. The dynamic output voltage and charge become negligible when the beam thickness reduces to one micrometer. By reducing the length–thickness ratio or introducing the effective piezoelectric coefficient, the electric response can be more easily detected at microscale. These results demonstrate that the flexoelectric effect can be strong enough to dominate the electromechanical coupling behavior, coordinating with the ‘ever green’ trend to miniaturization, and the flexoelectric effect can be applicable for energy harvesters, sensing, and others. © 2020, Springer-Verlag GmbH Austria, part of Springer Nature.

Keyword :

Thickness measurement Dynamics Micrometers Barium titanate Piezoelectricity Electromechanical coupling

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GB/T 7714 Chen, Wenhao , Liang, Xu , Shen, Shengping . Forced vibration of piezoelectric and flexoelectric Euler–Bernoulli beams by dynamic Green’s functions [J]. | Acta Mechanica , 2020 , 232 (2) : 449-460 .
MLA Chen, Wenhao et al. "Forced vibration of piezoelectric and flexoelectric Euler–Bernoulli beams by dynamic Green’s functions" . | Acta Mechanica 232 . 2 (2020) : 449-460 .
APA Chen, Wenhao , Liang, Xu , Shen, Shengping . Forced vibration of piezoelectric and flexoelectric Euler–Bernoulli beams by dynamic Green’s functions . | Acta Mechanica , 2020 , 232 (2) , 449-460 .
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Nonlinear electrochemomechanical modelling of electrochemical strain microscopy imaging EI SCIE PubMed Scopus
期刊论文 | 2020 , 31 (31) | NANOTECHNOLOGY | IF: 3.874
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

Electrochemical strain microscopy (ESM) is a powerful tool to resolve ionic transport and electrochemical processes with a nanoscale resolution. To ascertain the underlying mechanism that governs the signal generation of ESM imaging, a fully coupled nonlinear electrochemomechanical model based on the finite element method is developed and applied to LiMn2O4 particles. The frequency dependence of the ESM response, in particular the response at high frequencies used in the detection regime, is investigated in detail. The performed analysis demonstrates that the error induced by the decoupling approximation increases with decreasing bias frequency due to the relatively large variation in ion concentration. In the high frequency regime, the results reveal that the stress effect is negligible and local electroneutrality holds, providing the simplification of numerical simulation for ESM imaging. By applying an alternative current voltage, we suggest that the detectable signal observed in ESM imaging can be attributed to the Vegard effect, which was controversial in previous linear models. The local distribution of ion concentration shows that the ionic reorganization only takes place near the tip-surface junction, the spatial extent of which can be described by two relevant lengths, the contact radius and ion drift length, which determine the spatial lateral resolution and depth resolution, respectively, in ESM imaging. Through a parametric study, the electromigration is proved to be dominant at high frequencies and the relationship between ESM amplitude and some parameters may offer a strategy to measure local electrochemical reactivity. The impact of contact force is evaluated and the results indicate that the local compression reduces ion concentration and the resultant ESM signal in the detection regime. Thus attention must be paid to the contact force when a comparison between different measurements is conducted. The combination of the numerical model and experiment holds the promise of quantitative probing of local electrochemical parameters in solids.

Keyword :

quantitative characterization electrochemomechanical coupling high frequency response finite element method electrochemical strain microscopy local electrochemical activity

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GB/T 7714 Zhang, Gongxi , Liu, Wenyuan , Chen, Jianyong et al. Nonlinear electrochemomechanical modelling of electrochemical strain microscopy imaging [J]. | NANOTECHNOLOGY , 2020 , 31 (31) .
MLA Zhang, Gongxi et al. "Nonlinear electrochemomechanical modelling of electrochemical strain microscopy imaging" . | NANOTECHNOLOGY 31 . 31 (2020) .
APA Zhang, Gongxi , Liu, Wenyuan , Chen, Jianyong , Shen, Shengping . Nonlinear electrochemomechanical modelling of electrochemical strain microscopy imaging . | NANOTECHNOLOGY , 2020 , 31 (31) .
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Tailoring the nanostructures of electrochemical actuators for fast response and large deformation EI SCIE PubMed Scopus
期刊论文 | 2020 , 12 (29) , 15643-15651 | NANOSCALE | IF: 7.79
SCOPUS Cited Count: 1
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Electrochemical actuators (EAs) can effectively convert electric energy to mechanical energy through chemical reactions. However, the response rate and deformability, two of the crucial and antithetic factors in EA studies, can both hardly be improved just by developing or hybridizing different kinds of materials. In this work, this challenge is overcome through tailoring the nanostructures of EAs. A 3D nanoporous structure formed by aggregating spherical MoS2 nanoparticles (NPs) is reported. The NP-aggregated nanoporous structure not only provides a fast ion-migration process but also ensures strong mechanical strength. Experiments show that the voltage-dependent response rate and curvature amplitude respectively approach 0.015 mm(-1).s(-1).V-1 and 0.244 mm(-1).V-1, which simultaneously exceed those of most EAs. A continuous energy density of 14 kJ.m(-3), almost double that of mammalian muscle, enables the EA to rotate a stainless-steel weight which is over 550 times heavier than itself. By opening a new way to improve EAs' comprehensive performance, this research propels their potential applications in microrobotics and mini-medical devices.

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GB/T 7714 Ji, Liang , Yu, Yiwen , Deng, Qian et al. Tailoring the nanostructures of electrochemical actuators for fast response and large deformation [J]. | NANOSCALE , 2020 , 12 (29) : 15643-15651 .
MLA Ji, Liang et al. "Tailoring the nanostructures of electrochemical actuators for fast response and large deformation" . | NANOSCALE 12 . 29 (2020) : 15643-15651 .
APA Ji, Liang , Yu, Yiwen , Deng, Qian , Shen, Shengping . Tailoring the nanostructures of electrochemical actuators for fast response and large deformation . | NANOSCALE , 2020 , 12 (29) , 15643-15651 .
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Flexoelectric Energy Harvesting Using Circular Thin Membranes EI SCIE Scopus
期刊论文 | 2020 , 87 (9) | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME | IF: 2.168
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Abstract :

In this work, we propose a circular membrane-based flexoelectric energy harvester. Different from previously reported nanobeams based flexoelectric energy harvesters, for the flexoelectric membrane, the polarization direction around its center is opposite in sign to that far away from the center. To avoid the cancelation of the electric output, electrodes coated to upper and lower surfaces of the flexoelectric membrane are respectively divided into two parts according to the sign of bending curvatures. Based on Hamilton's principle and Ohm's law, we obtain governing equations for the circular membrane-based flexoelectric energy harvester. A generalized assumed-modes method is employed for solving the system, so that the performance of the flexoelectric energy harvester can be studied in detail. We analyze the effects of the thickness h, radius r(0), and their ratio on the energy harvesting performance. Specifically, we show that, by selecting appropriate h and r(0), it is possible to design an energy harvester with both high energy conversion efficiency and low working frequency. At last, through numerical simulations, we further study the optimization ratio for which the electrodes should be divided.

Keyword :

elasticity constitutive modeling of materials structures

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GB/T 7714 Li, Zhaoqi , Deng, Qian , Shen, Shengping . Flexoelectric Energy Harvesting Using Circular Thin Membranes [J]. | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2020 , 87 (9) .
MLA Li, Zhaoqi et al. "Flexoelectric Energy Harvesting Using Circular Thin Membranes" . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 87 . 9 (2020) .
APA Li, Zhaoqi , Deng, Qian , Shen, Shengping . Flexoelectric Energy Harvesting Using Circular Thin Membranes . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2020 , 87 (9) .
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Electrochemomechanical modeling and in situ measurement of transition metal dichalcogenides-based electrochemical actuators EI SCIE Scopus
期刊论文 | 2020 , 167 (16) | Journal of the Electrochemical Society | IF: 4.316
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Since working voltages are much higher than water electrolysis voltage, traditional ionic electroactive polymers (IEAPs) such as ionomeric polymer-metal composites and conjugated polymers still face the great challenges like back relaxation, leakage and evaporation of electrolyte. Newly developed transition metal dichalcogenides (TMDs)-based IEAP, which can be driven by the voltage as low as 0.3 V, becomes a promising candidate to overcome those challenges. Herein, an electrochemomechanical model, coupling ions intercalation and chemical reaction, is proposed for the first time to explain the mechanism of TMDs-based IEAPs. To further validate the model, molybdenum disulfide/Aluminum electrochemical actuators (EAs) are fabricated. Then chemical and mechanical performance of the EAs are recorded in situ during actuation. A good agreement is achieved by comparing theoretical and experimental results. A model study is performed to predict the effects of scan rate, working temperature and PH value of the electrolyte on curvature evolution. Results show that scan rate and temperature can hardly influence curvature amplitude while PH value of the electrolyte greatly affects curvature evolution. Moreover, response rate of EAs increases with scan rate. An optimal thickness ratio of 0.5 is also found for bilayered EAs. This study paves a new way for promoting the development of TMDs-based IEAPs. © 2020 The Electrochemical Society ('ECS').

Keyword :

Metal working Layered semiconductors Molybdenum compounds Conducting polymers Actuators Electrolytes Intercalation Transition metals Sulfur compounds pH Conjugated polymers

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GB/T 7714 Ji, Liang , Cao, Hongyu , Shen, Shengping . Electrochemomechanical modeling and in situ measurement of transition metal dichalcogenides-based electrochemical actuators [J]. | Journal of the Electrochemical Society , 2020 , 167 (16) .
MLA Ji, Liang et al. "Electrochemomechanical modeling and in situ measurement of transition metal dichalcogenides-based electrochemical actuators" . | Journal of the Electrochemical Society 167 . 16 (2020) .
APA Ji, Liang , Cao, Hongyu , Shen, Shengping . Electrochemomechanical modeling and in situ measurement of transition metal dichalcogenides-based electrochemical actuators . | Journal of the Electrochemical Society , 2020 , 167 (16) .
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