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< Page ,Total 28 >
Flattening and solidification behavior of in-flight droplets in plasma spraying and micro/macro-bonding mechanisms SCIE
期刊论文 | 2019 , 784 , 834-846 | JOURNAL OF ALLOYS AND COMPOUNDS
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Abstract :

The microstructure and bonding strength of plasma sprayed coating are highly dependent on flattening and solidification behavior of in-flight droplets. In the present study, the flattening and solidification behavior of subsonic/supersonic droplets after impacting on a flat substrate was comparatively studied. Results show that a dimensionless Somerfeld number (K) of flattening droplets can be used as the splashing threshold. Due to the extremely rapid spreading and solidification of supersonic-droplet, some large-sized bubbles and grains that usually formed at the bottom of flattened subsonic-droplet were effectively restrained, leading to the improvement of splat/substrate micro-shear strength. The effect of grain size and growth feature on the macro-bonding property was further elaborated. It was found that the simultaneous increase of both velocity and temperature of in-flight droplets was an effective approach for the improvement of bonding strength of as-sprayed coating. (C) 2019 Elsevier B.V. All rights reserved.

Keyword :

Yttria partially stabilized zirconia Thermal barrier coatings Bubbles Micro/macro-bonding Splats

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GB/T 7714 Wang, Y. , Bai, Y. , Wu, K. et al. Flattening and solidification behavior of in-flight droplets in plasma spraying and micro/macro-bonding mechanisms [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2019 , 784 : 834-846 .
MLA Wang, Y. et al. "Flattening and solidification behavior of in-flight droplets in plasma spraying and micro/macro-bonding mechanisms" . | JOURNAL OF ALLOYS AND COMPOUNDS 784 (2019) : 834-846 .
APA Wang, Y. , Bai, Y. , Wu, K. , Zhou, J. , Shen, M. G. , Fan, W. et al. Flattening and solidification behavior of in-flight droplets in plasma spraying and micro/macro-bonding mechanisms . | JOURNAL OF ALLOYS AND COMPOUNDS , 2019 , 784 , 834-846 .
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The Effect of Discharge Area Variation on Stochastic Characters of PD Magnitude EI SCIE Scopus
期刊论文 | 2017 , 24 (1) , 217-226 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | IF: 1.774
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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Abstract :

Surface charges generated by previous discharges at the solid-gas interface in a void can affect the characteristics of subsequent ones. In this paper, the effect of discharge area variation on the stochastic characters of partial discharge (PD) magnitude was investigated by changing the void size. It is found that the uniformity of PD magnitude increased when void diameter was reduced. In order to clarify this, the corresponding discharge area variation was obtained by Pockels effect of Bismuth Silicon Oxide (BSO) crystal. As void diameter became smaller, due to the limitation of cavity walls, the fluctuation of discharge area became weaker, and hence the uniformity of PD magnitude increased. Besides, the result that the fluctuation of PD magnitude decreased when PD void height became larger was obtained. Considering the safety of BSO crystal, surface charge distribution was not measured by experiment for this case. Instead, a simulation model was constructed to obtain it. As a result, discharge area became larger when void height increased. According to this, it is inferred that the expanding of discharge area may be affected by cavity walls in the experiment. Therefore, the changing tendency of the uniformity of PD magnitude with the void height can be explained when the void area remained unchanged. These results suggest that the variation of discharge area can affect the stochastic character of PD magnitude and further investigation is needed to clarify the PD mechanism.

Keyword :

surface charge Partial discharge equations stochastic characters fluid void size discharge area

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GB/T 7714 Pan, Cheng , Wu, Kai , Meng, Yongpeng et al. The Effect of Discharge Area Variation on Stochastic Characters of PD Magnitude [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (1) : 217-226 .
MLA Pan, Cheng et al. "The Effect of Discharge Area Variation on Stochastic Characters of PD Magnitude" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 24 . 1 (2017) : 217-226 .
APA Pan, Cheng , Wu, Kai , Meng, Yongpeng , Cheng, Yonghong , Tang, Ju . The Effect of Discharge Area Variation on Stochastic Characters of PD Magnitude . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (1) , 217-226 .
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Investigation of structural and electrochemical properties of LaSrCo1-xSbxO4 (0 <= x <= 0.20) as potential cathode materials in intermediate-temperature solid oxide fuel cells EI SCIE Scopus
期刊论文 | 2017 , 247 , 24-30 | JOURNAL OF SOLID STATE CHEMISTRY | IF: 2.179
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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Abstract :

The structural and electrochemical properties of the layered perovskite oxides LaSrC1-xSbxO4 (0 <= x <= 0.20) were investigated to study the effects of substituting Sb for Co for application as cathode materials in intermediate temperature solid oxide fuel cells (IT-SOFCs). The results of crystal structure analyses show the maximum content of Sb in LaSrCo1-xSbxO4 to be 0.05 as a pure single phase. XPS shows that Co and Sb in LaSrCo0.95Sb0.05O4 may possess mixed-oxidation states. The electrical conductivity increased greatly after Sb substitution. An improvement in the cathode polarization (R-p) values is observed from the Sb-doped sample with respect to the undoped samples. For example, R-p of LaSrCo0.95Sb0.05O4 on LSGM was observed to be 0.16 Omega cm(2) at 800 degrees C in air. The main rate-limiting step for LaSrCo0.95Sb0.05O4 cathode is charge transfer of oxygen atoms. These results indicate that Sb can be incorporated into LaSrCo1-xSbxO4 based materials and can have a beneficial effect on the performance, making them potentially suitable for use as cathode materials in IT-SOFCs.

Keyword :

Electrochemical properties Solid oxide fuel cells K2NiF4 Cathode

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GB/T 7714 Wang, Junkai , Zhou, Jun , Fan, Weiwei et al. Investigation of structural and electrochemical properties of LaSrCo1-xSbxO4 (0 <= x <= 0.20) as potential cathode materials in intermediate-temperature solid oxide fuel cells [J]. | JOURNAL OF SOLID STATE CHEMISTRY , 2017 , 247 : 24-30 .
MLA Wang, Junkai et al. "Investigation of structural and electrochemical properties of LaSrCo1-xSbxO4 (0 <= x <= 0.20) as potential cathode materials in intermediate-temperature solid oxide fuel cells" . | JOURNAL OF SOLID STATE CHEMISTRY 247 (2017) : 24-30 .
APA Wang, Junkai , Zhou, Jun , Fan, Weiwei , Wang, Wendong , Wu, Kai , Cheng, Yonghong . Investigation of structural and electrochemical properties of LaSrCo1-xSbxO4 (0 <= x <= 0.20) as potential cathode materials in intermediate-temperature solid oxide fuel cells . | JOURNAL OF SOLID STATE CHEMISTRY , 2017 , 247 , 24-30 .
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Recovery Algorithm for Space Charge Waveform in Coaxial Cable under Temperature Gradient EI SCIE Scopus
期刊论文 | 2017 , 29 (8) , 1147-1157 | SENSORS AND MATERIALS | IF: 0.482
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

The accumulation of space charge in a coaxial cable under high -voltage direct current (HVDC) may lead to the serious distortion of the internal electrical field, and thus extremely affect the long-term reliability of the cable in service. Therefore, it is significant to measure the space charge characteristic in a full-size power cable in real time. However, because of the existence of a temperature gradient across the cable insulation under DC electrical stress, the density of the dielectric will be inhomogeneous. Moreover, the effect of the coaxial structure on the distortion of measuring waveforms has to be taken into consideration. In this paper, an improved pulsed electroacoustic (PEA) system suited for a full-size power cable under a temperature gradient was realized by designing the units of pulse injection and signal detection. Then, the charge density was corrected according to the nonuniform electric stress distribution and the divergent acoustic propagation. Finally, the system transfer function was amended by adding the dispersion coefficient's quadratic approximation to the general solution of the general wave propagation equation. With this new recovery algorithm, the distortion of the waveform caused by the cable's coaxial structure, acoustic waves' attenuation and dispersion, and temperature gradient effect can be recovered successfully.

Keyword :

space charge coaxial cable recovery algorithm temperature gradient

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GB/T 7714 Wang Xia , Chen Chi , Hao Jia-Qi et al. Recovery Algorithm for Space Charge Waveform in Coaxial Cable under Temperature Gradient [J]. | SENSORS AND MATERIALS , 2017 , 29 (8) : 1147-1157 .
MLA Wang Xia et al. "Recovery Algorithm for Space Charge Waveform in Coaxial Cable under Temperature Gradient" . | SENSORS AND MATERIALS 29 . 8 (2017) : 1147-1157 .
APA Wang Xia , Chen Chi , Hao Jia-Qi , Wu Kai , Chen Xin , Li Wen-Peng et al. Recovery Algorithm for Space Charge Waveform in Coaxial Cable under Temperature Gradient . | SENSORS AND MATERIALS , 2017 , 29 (8) , 1147-1157 .
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Factors Affecting Pulse Injection from Measuring Electrode Based on the Pulsed Electroacoustic Technology for Coaxial Cables EI SCIE Scopus
期刊论文 | 2017 , 29 (8) , 1135-1146 | SENSORS AND MATERIALS | IF: 0.482
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

In the pulsed electroacoustic (PEA) space charge measurement system used for coaxial cables, the waveform of a coupled pulse will directly affect space charge profiles in cable insulation. In this paper, on the basis of the PEA measurement system with pulse injection from a measuring electrode, the original charge acoustic signals in a 35 kV cross-linked polyethylene (XLPE) cable were collected directly from the oscilloscope under different ground distances between the measuring point and the ground point along a cable's semiconductive (SC) layer. At the same time, the effects of ground distance, cable specification, and cable length on the waveform of a coupled pulse were studied through a series of experiments and simulations. The results show that the amplitude of the coupled pulse is directly proportional to the ground distance but inversely proportional to the cable cross section or voltage class. Furthermore, the pulse coupling efficiency is almost the same only if the cables have the same diameter of the outer SC layer. Therefore, a constant pulse coupling efficiency can be obtained by adjusting the ground distance according to the diameter of the cable's outer SC layer.

Keyword :

pulsed electroacoustic method coaxial cable outer semiconductive layer coupled pulse pulse injection

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GB/T 7714 Wang Xia , Hao Jia-Qi , Xiong Jin-Zhou et al. Factors Affecting Pulse Injection from Measuring Electrode Based on the Pulsed Electroacoustic Technology for Coaxial Cables [J]. | SENSORS AND MATERIALS , 2017 , 29 (8) : 1135-1146 .
MLA Wang Xia et al. "Factors Affecting Pulse Injection from Measuring Electrode Based on the Pulsed Electroacoustic Technology for Coaxial Cables" . | SENSORS AND MATERIALS 29 . 8 (2017) : 1135-1146 .
APA Wang Xia , Hao Jia-Qi , Xiong Jin-Zhou , Wu Kai , Fu Ming-Li , Hou Shuai . Factors Affecting Pulse Injection from Measuring Electrode Based on the Pulsed Electroacoustic Technology for Coaxial Cables . | SENSORS AND MATERIALS , 2017 , 29 (8) , 1135-1146 .
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Effect of toughened epoxy resin on partial discharge at solid-solid interface EI SCIE Scopus CSCD
期刊论文 | 2017 , 19 (2) | PLASMA SCIENCE & TECHNOLOGY | IF: 1.07
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

A series of solid-solid interfaces, consisting of ceramic-epoxy resin interface samples with a tip-plate electrode, were investigated by performing partial discharge tests and realtime. electrical tree observations. A toughening agent was added to the epoxy resin at different ratios for comparison. The impact strength, differential scanning calorimetry (DSC) and dielectric properties of the cured compositions and ceramic were tested. The electric field strength at the tip was calculated based on Maxwell's theory. The test results show that the addition of a toughener can improve the impact strength of epoxy resin but it decreases the partial discharge inception voltage (PDIV) of the interface sample. At the same time, toughening leads to complex branches of the electrical tree. The simulation result suggests that this reduction of the PDIV cannot be explained by a change of permittivity due to the addition of a toughening agent. The microstructural change caused by toughening was considered to be the key factor for lower PDIV and complex electrical tree branches.

Keyword :

solid-solid interface partial discharge epoxy resin toughening electrical tree

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GB/T 7714 Li, Manping , Wu, Kai , Zhang, Zhao et al. Effect of toughened epoxy resin on partial discharge at solid-solid interface [J]. | PLASMA SCIENCE & TECHNOLOGY , 2017 , 19 (2) .
MLA Li, Manping et al. "Effect of toughened epoxy resin on partial discharge at solid-solid interface" . | PLASMA SCIENCE & TECHNOLOGY 19 . 2 (2017) .
APA Li, Manping , Wu, Kai , Zhang, Zhao , Cheng, Yonghong . Effect of toughened epoxy resin on partial discharge at solid-solid interface . | PLASMA SCIENCE & TECHNOLOGY , 2017 , 19 (2) .
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Effect of Space Charge in the Aging Law of Cross-Linked Polyethylene Materials for High Voltage DC Cables EI SCIE Scopus
期刊论文 | 2017 , 33 (4) , 53-59 | IEEE ELECTRICAL INSULATION MAGAZINE | IF: 1.764
WoS CC Cited Count: 2
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Keyword :

step-voltage test aging space charge aging law high voltage DC insulation

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GB/T 7714 Wu, Kai , Wang, Ya , Wang, Xia et al. Effect of Space Charge in the Aging Law of Cross-Linked Polyethylene Materials for High Voltage DC Cables [J]. | IEEE ELECTRICAL INSULATION MAGAZINE , 2017 , 33 (4) : 53-59 .
MLA Wu, Kai et al. "Effect of Space Charge in the Aging Law of Cross-Linked Polyethylene Materials for High Voltage DC Cables" . | IEEE ELECTRICAL INSULATION MAGAZINE 33 . 4 (2017) : 53-59 .
APA Wu, Kai , Wang, Ya , Wang, Xia , Fu, Mingli , Hou, Shuai . Effect of Space Charge in the Aging Law of Cross-Linked Polyethylene Materials for High Voltage DC Cables . | IEEE ELECTRICAL INSULATION MAGAZINE , 2017 , 33 (4) , 53-59 .
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Investigation of dielectric and thermal conductive properties of epoxy resins modified by core-shell structured PS@SiO2 EI SCIE Scopus
期刊论文 | 2017 , 97 , 76-82 | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | IF: 4.514
WoS CC Cited Count: 2
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Abstract :

In this study, the core-shell structured polystyrene@SiO2 (PS@SiO2) microspheres were successfully synthesized by tetraethylorthosilicate (TEOS) hydrolysis method. The synthesized PS@SiO2 microspheres were subsequently characterized by FTIR spectroscopy, XRD, SEM, and TEM respectively. The results indicated that the particle size of PS@SiO2 microspheres is about 2 gm, and the PS microsphere is uniformly coated by amorphous SiO2 shell. PS@SiO2/cyanate ester (CE)/epoxy resin (ER) composite films were prepared with PS@SiO2 microspheres as fillers and morphology of the films was inspected by AFM. The images showed that the PS@SiO2 microspheres were well-distributed in epoxy matrix. Thermal conductivity of PS@SiO2/CE/ER composite increases 131% by adding 1.0 wt% of PS@SiO2 microspheres. The volume resistivity of composites decreased with increasing of the loading of PS@SiO2 fillers and still keeping an excellent insulating performance. In addition, the dielectric constant as well as the dielectric loss of composites increased with the increased the content of PS@SiO2 microspheres. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

PS@SiO2 microspheres Dielectric property Thermal conductivity CE/ER matrix

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GB/T 7714 Zhou, Jun , Jiang, Yingye , Wu, Gaoqing et al. Investigation of dielectric and thermal conductive properties of epoxy resins modified by core-shell structured PS@SiO2 [J]. | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING , 2017 , 97 : 76-82 .
MLA Zhou, Jun et al. "Investigation of dielectric and thermal conductive properties of epoxy resins modified by core-shell structured PS@SiO2" . | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING 97 (2017) : 76-82 .
APA Zhou, Jun , Jiang, Yingye , Wu, Gaoqing , Wu, Weijian , Wang, Yang , Wu, Kai et al. Investigation of dielectric and thermal conductive properties of epoxy resins modified by core-shell structured PS@SiO2 . | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING , 2017 , 97 , 76-82 .
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Porous YFe0.5Co0.5O3 thin sheets as cathode for intermediate-temperature solid oxide fuel cells EI SCIE Scopus
期刊论文 | 2017 , 42 (31) , 20164-20175 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | IF: 4.229
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

In this work, porous YFe0.5Co0.5,O-3 (YFC) thin sheets were-synthesized by citric acid method. The crystal structure, morphology, thermal expansion, electrical conductivity, and electrochemical properties of YFC were investigated to evaluate it as a possible cathode on BaZr0.1Ce0.7Y0.2O3 (BZCY) electrolyte for intermediate-temperature solid oxide fuel cells (ITSOFCs). An orthorhombic perovskite structure was observed in YFC. The conductivity of YFC is 183 S cm (-1) at 750 degrees C in air. The coefficient of thermal expansion of composite cathode YFC-BZCY is closer to BZCY electrolyte than YFC. The composite cathode represents a relatively low polarization resistance (R-P) of 0.07 Omega cm(2) at 750 degrees C in air due to the porous thin sheet-like cathode. The oxygen reduction reaction process and the reaction activation energy of cathode were also analyzed. An anode-supported cell of NiO-BZCY IBZCY IYFC-BZCY is fabricated by a simple method of co-pressing. The power density of the cell is 303 mW cm(-2) at 750 degrees C as the thickness of electrolyte is 400 mu m. The results suggest that YFC is a promising cathode candidate for IT-SOFC. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Electrochemical properties oxide fuel cell Composite cathode Intermediate temperature solid Proton conducting electrolyte

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GB/T 7714 Cui, Jiajia , Wang, Junkai , Fan, Weiwei et al. Porous YFe0.5Co0.5O3 thin sheets as cathode for intermediate-temperature solid oxide fuel cells [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2017 , 42 (31) : 20164-20175 .
MLA Cui, Jiajia et al. "Porous YFe0.5Co0.5O3 thin sheets as cathode for intermediate-temperature solid oxide fuel cells" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 42 . 31 (2017) : 20164-20175 .
APA Cui, Jiajia , Wang, Junkai , Fan, Weiwei , Wan, Yiheng , Zhang, Xiongwen , Li, Guojun et al. Porous YFe0.5Co0.5O3 thin sheets as cathode for intermediate-temperature solid oxide fuel cells . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2017 , 42 (31) , 20164-20175 .
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Interface Charges between Insulating Materials EI SCIE Scopus
期刊论文 | 2017 , 24 (4) , 2633-2642 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | IF: 1.774
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Abstract :

Multi-layer insulations are commonly used in HVDC applications, giving rise to physical and chemical interfaces in the insulation systems. Space charges at the interface between insulators play crucial roles on the electric field distribution of such insulation systems. The issue arises in the design of high voltage direct current (HVDC) insulations. How to understand the behaviors, mechanisms and effects of interface charges on the electric field distribution? In the past two decades, this specific topic has attracted much interest. Much experimental evidence has shown that interface charges may not follow the classic Maxwell-Wagner-Sillar (MWS) theory. In this paper, the measurement techniques and the phenomena of space charge behaviors at the interfaces between different insulating materials are summarized. It is indicated that surface states should be included in the numerical simulation of the charge and field distributions.

Keyword :

interface traps multi-layer dielectrics interfaces Space charges MWS polarization interface potential barrier

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GB/T 7714 Wu, Kai , Cheng, Chuanhui . Interface Charges between Insulating Materials [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (4) : 2633-2642 .
MLA Wu, Kai et al. "Interface Charges between Insulating Materials" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 24 . 4 (2017) : 2633-2642 .
APA Wu, Kai , Cheng, Chuanhui . Interface Charges between Insulating Materials . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (4) , 2633-2642 .
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