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< Page ,Total 131 >
Morphology and energy storage properties of nano-ZrO2/Polypropylene composite CPCI-S CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

In the present study, we introduced the nano-ZrO2 into the polypropylene (PP) matrix and systematically studied its effect on the morphology and energy storage properties of the obtained nano-composites. Nano-ZrO2 showed good dispersion in PP matrix and suppressed the formation of beta-crystal, modifying the microstructure and decreasing the crystallinity to a small extent. The DC breakdown test results show that both the scaled parameter and shape parameter of Weibull distribution were improved by nano-ZrO2 doping, and at the same time the dielectric constant also increased comparing with neat PP. Consequently, the energy density of nano-ZrO2/PP composites was enhanced to 1.47 J/cm(3) with 0.5 wt% nano-ZrO2 doped, while the losses kept the low value same as neat PP. This work provides a promising candidate of PP nano-composites for industry practical application due to the combination of enhanced energy density and low losses.

Keyword :

polypropylene nanocomposite dielectric energy storage

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GB/T 7714 Cheng, Lu , Liu, Wenfeng , Liu, Xiaowei et al. Morphology and energy storage properties of nano-ZrO2/Polypropylene composite [C] . 2018 .
MLA Cheng, Lu et al. "Morphology and energy storage properties of nano-ZrO2/Polypropylene composite" . (2018) .
APA Cheng, Lu , Liu, Wenfeng , Liu, Xiaowei , Liu, Chengming , Li, Shengtao . Morphology and energy storage properties of nano-ZrO2/Polypropylene composite . (2018) .
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Continuous Positive Space Charge in Silicone Rubber Insulation CPCI-S CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

In the case of silicone rubber, the space charge measurement is confronted with difficulty due to the elasticity of the material. Moreover, it has been found that the space charge presents critical behaviors with respect to the hard material. This work focuses on the positive space charge characteristics of silicone rubber, and try to further understand the positive charge dynamics in silicone rubber material. The space charge profiles were measured by a typical pulsed electro-acoustic (PEA) system under room temperature. A critical positive charge injection and positive charge packet occur in the sample with a low injection field. Negative charge injection also occurs, and the negative homo charge accumulation locates near the electrode. The positive charge packet indicated an enhancement by the field and migrated faster under the high field. Non-uniform distribution of traps and deep hole traps contribute to the positive space charge dynamics in silicone rubber sample.

Keyword :

silicone rubber space charge traps positive charge packet

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GB/T 7714 Wang, Weiwang , Li, Shengtao , Xie, Dongri et al. Continuous Positive Space Charge in Silicone Rubber Insulation [C] . 2018 .
MLA Wang, Weiwang et al. "Continuous Positive Space Charge in Silicone Rubber Insulation" . (2018) .
APA Wang, Weiwang , Li, Shengtao , Xie, Dongri , Tanaka, Yasuhiro . Continuous Positive Space Charge in Silicone Rubber Insulation . (2018) .
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Continuous Positive Space Charge in Silicone Rubber Insulation CPCI-S CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
Abstract&Keyword Cite

Abstract :

In the case of silicone rubber, the space charge measurement is confronted with difficulty due to the elasticity of the material. Moreover, it has been found that the space charge presents critical behaviors with respect to the hard material. This work focuses on the positive space charge characteristics of silicone rubber, and try to further understand the positive charge dynamics in silicone rubber material. The space charge profiles were measured by a typical pulsed electro-acoustic (PEA) system under room temperature. A critical positive charge injection and positive charge packet occur in the sample with a low injection field. Negative charge injection also occurs, and the negative homo charge accumulation locates near the electrode. The positive charge packet indicated an enhancement by the field and migrated faster under the high field. Non-uniform distribution of traps and deep hole traps contribute to the positive space charge dynamics in silicone rubber sample.

Keyword :

silicone rubber space charge traps positive charge packet

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GB/T 7714 Wang, Weiwang , Li, Shengtao , Xie, Dongri et al. Continuous Positive Space Charge in Silicone Rubber Insulation [C] . 2018 .
MLA Wang, Weiwang et al. "Continuous Positive Space Charge in Silicone Rubber Insulation" . (2018) .
APA Wang, Weiwang , Li, Shengtao , Xie, Dongri , Tanaka, Yasuhiro . Continuous Positive Space Charge in Silicone Rubber Insulation . (2018) .
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Morphology and energy storage properties of nano-ZrO2/Polypropylene composite CPCI-S CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
Abstract&Keyword Cite

Abstract :

In the present study, we introduced the nano-ZrO2 into the polypropylene (PP) matrix and systematically studied its effect on the morphology and energy storage properties of the obtained nano-composites. Nano-ZrO2 showed good dispersion in PP matrix and suppressed the formation of beta-crystal, modifying the microstructure and decreasing the crystallinity to a small extent. The DC breakdown test results show that both the scaled parameter and shape parameter of Weibull distribution were improved by nano-ZrO2 doping, and at the same time the dielectric constant also increased comparing with neat PP. Consequently, the energy density of nano-ZrO2/PP composites was enhanced to 1.47 J/cm(3) with 0.5 wt% nano-ZrO2 doped, while the losses kept the low value same as neat PP. This work provides a promising candidate of PP nano-composites for industry practical application due to the combination of enhanced energy density and low losses.

Keyword :

polypropylene nanocomposite dielectric energy storage

Cite:

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GB/T 7714 Cheng, Lu , Liu, Wenfeng , Liu, Xiaowei et al. Morphology and energy storage properties of nano-ZrO2/Polypropylene composite [C] . 2018 .
MLA Cheng, Lu et al. "Morphology and energy storage properties of nano-ZrO2/Polypropylene composite" . (2018) .
APA Cheng, Lu , Liu, Wenfeng , Liu, Xiaowei , Liu, Chengming , Li, Shengtao . Morphology and energy storage properties of nano-ZrO2/Polypropylene composite . (2018) .
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Effect of Fractional Order Parameter on an Elastic Half Space Under the Theory of Fractional Order Generalized Thermoelasticity CPCI-S CSSCI-E
会议论文 | 2018 , 283-289 | International Conference on Mechanics and Materials Science (MMS)
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Abstract :

Based on the Sherief's fractional order generalized thermoelasticity theory, a homogenous and isotropic elastic half space subjected to a thermal shock on the boundary of the elastic medium has been studied by employing Laplace transform and numerical inversion of Laplace transform algorithm. The distributions of nondimensional temperature, displacement and stress are obtained and illustrated graphically. The effects of fractional order parameters on the variations of different fields inside the medium are discussed.

Keyword :

Elastic Half Space Fractional Order Generalized Thermoelasticity Theory Laplace Transforms Numerical Inversion of the Laplace Transforms

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GB/T 7714 Xia, Rong-Hou , Tian, Xiao-Geng . Effect of Fractional Order Parameter on an Elastic Half Space Under the Theory of Fractional Order Generalized Thermoelasticity [C] . 2018 : 283-289 .
MLA Xia, Rong-Hou et al. "Effect of Fractional Order Parameter on an Elastic Half Space Under the Theory of Fractional Order Generalized Thermoelasticity" . (2018) : 283-289 .
APA Xia, Rong-Hou , Tian, Xiao-Geng . Effect of Fractional Order Parameter on an Elastic Half Space Under the Theory of Fractional Order Generalized Thermoelasticity . (2018) : 283-289 .
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Wideband Vivaldi Antenna Design With Reduced Radar Cross Section CPCI-S CSSCI-E
会议论文 | 2018 | Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC)
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Abstract :

In this paper, a stealth vivaldi antenna is proposed which covers 7 GHz to 11 GHz operating frequency range with reduced radar cross section (RCS) and high gain. RCS reduction is achieved by the object shaping method fulfilled with the use of introduced circular slots etched in the radiator. These circular slots along the inner exponential profile of the antenna reduce the scattering along the surface of the radiator, which hence causes reduction in monostatic RCS. Compared with the reference antenna, the RCS of the proposed antenna maximally obtains 16 dB reduction. Simulated results related to S11, gain, RCS and VSWR of the reference and proposed antennas are presented. The performance of the proposed antenna is validated.

Keyword :

radar cross section (RCS) object shaping method vivaldi antenna stealth antenna

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GB/T 7714 Khan, Tayyab A. , Li, Jianxing , Chen, Juan et al. Wideband Vivaldi Antenna Design With Reduced Radar Cross Section [C] . 2018 .
MLA Khan, Tayyab A. et al. "Wideband Vivaldi Antenna Design With Reduced Radar Cross Section" . (2018) .
APA Khan, Tayyab A. , Li, Jianxing , Chen, Juan , Abdullah, Muhammad , Zhang, Anxue . Wideband Vivaldi Antenna Design With Reduced Radar Cross Section . (2018) .
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Macro Bending Effect in Optical Fiber Composite Low Voltage Cable CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

Smart Grid distribution network comprised of power supply cable as well as two way communication between the customer and grid. This two way communication is carried out by Optical fiber composite low voltage cable (OPLC). In the installation of OPLC cable, the most important factor to be taken care of is the attenuation loss occur in optical unit. In attenuation loss, macro bending is one of the major contributors. Therefore it is necessary to minimize the macro bending loss in signal attenuation while installing the OPLC cable. In this paper, we have studied the macro bending effect in optical fiber unit of optical fiber composite low voltage cable that occurs in handling and installation process of the cable. In the paper, simulation is being done by using COMSOL to measure the attenuation loss in bending the cable at the suggested radius. The experiment is carried out to analyze and investigate the attenuation loss at different bending radius and number of turns. The critical radius and suggested radius for installation have been proposed to keep the attenuation loss below 0.15 dB.

Keyword :

snell's law single mode fiber critical radius suggested radius macro bending loss

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GB/T 7714 Ashfaq, Ahsan , Chen, Yu , Yao, Kai et al. Macro Bending Effect in Optical Fiber Composite Low Voltage Cable [C] . 2018 .
MLA Ashfaq, Ahsan et al. "Macro Bending Effect in Optical Fiber Composite Low Voltage Cable" . (2018) .
APA Ashfaq, Ahsan , Chen, Yu , Yao, Kai , Sun, Guanshu , Yu, Jing . Macro Bending Effect in Optical Fiber Composite Low Voltage Cable . (2018) .
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A hardening/softening elasto-plastic constitutive model for soils CPCI-S CSSCI-E
会议论文 | 2018 , 131-136 | 7th China-Japan Geotechnical Symposium (CJGS)
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Abstract :

The behavior of soils is complex and may exhibit strain hardening or strain softening characteristics. To guarantee stability in geotechnical engineering, it is necessary to develop a constitutive model to predict the behavior of soils. This paper proposes an elasto-plastic constitutive model in tie framework of plasticity theory. A unified strength theory that considers the effect of the intermediate principal stress on the strength of soils is introduced. A yield function is developed based on the unified strength theory. The mobilization of the strength components is analyzed, and a hardening function is detemined. An clasto-plastic constitutive model is developed using the non-associated flow rule. The singularities of the proposed model that are caused by the flow vectors of the yield function and potential function are investigated. The proposed constitutive model is then extended from strain hardening to strain softening by modifying the hardening function.

Keyword :

constitutive model strain softening strain hardening unified strength theory

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GB/T 7714 Li, Hangzhou , Liu, Xuegang , Wang, Siyi . A hardening/softening elasto-plastic constitutive model for soils [C] . 2018 : 131-136 .
MLA Li, Hangzhou et al. "A hardening/softening elasto-plastic constitutive model for soils" . (2018) : 131-136 .
APA Li, Hangzhou , Liu, Xuegang , Wang, Siyi . A hardening/softening elasto-plastic constitutive model for soils . (2018) : 131-136 .
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Effect of moisture absorption on dielectric properties of polypropylene-based blend CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

The effect of moisture absorption on the dielectric properties of polypropylene-polyolefin elastomer blend was investigated. It was found that the crystalline structure was influenced by elastomer blended. However, the blending had few effected on the melting and crystallization behavior. The DC breakdown strength, electrical conductivity, and space charge distribution were influenced by moisture content. The result in this paper contributed to the stability evaluation of new blend.

Keyword :

morphology compolymer dielectric properties moisture absorption

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GB/T 7714 Chi, Xiaohong , Liu, Wenfeng , Li, Shengtao et al. Effect of moisture absorption on dielectric properties of polypropylene-based blend [C] . 2018 .
MLA Chi, Xiaohong et al. "Effect of moisture absorption on dielectric properties of polypropylene-based blend" . (2018) .
APA Chi, Xiaohong , Liu, Wenfeng , Li, Shengtao , Zhang, Xiaohong . Effect of moisture absorption on dielectric properties of polypropylene-based blend . (2018) .
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Role of thermal properties of cathode materials for the nanoscale breakdown in vacuum CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

Nowadays, electrical insulation issue has attracted increasing concerns as the physical dimension of electrical devices and equipment shrinks to micrometer and even nanometer. Since almost all the nanostructures and nanodevices are driven by electrical bias, it is very vital to make sure a good robustness while operating under the high electric field. Hence, to understand the breakdown behaviors across a vacuum nanogap is of great interest for the insulation reliability evaluation of naonstructures and nanodevices. In the present work, cathode materials with various thermal properties were employed and the breakdown measurement was carried out across a 100-nm vacuum gap by utilizing the in-situ nanoscale discharge measurement system based on the scanning electron microscope and piezoelectric nano-manipulator. Results show that the I-V curves for both Mo and W cathodes demonstrate the similar trend, which can be generally regarded to be three stages: leakage dark current stage (several pA), electron emission stage (similar to 2.0nA) and breakdown development stage (several mA). Moreover, W cathode with a higher melting point shows a larger average breakdown threshold (similar to 241.2V) than Mo cathode (similar to 199.4V), which indicates the metal atomic vapor evaporated from the cathode plays a key role on the electron avalanche and breakdown. As a consequence, the hypothesis for cathode process is put forward, regarding that the field emission dominates the initial stage and then thermionic emission takes over until the gap is filled with massive ions and electrons and the breakdown occurs. This would be of great benefit for better understanding of vacuum breakdown behavior at nanoscale.

Keyword :

breakdown electron emssion cathode thermal properties nanogap atomic vapor

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GB/T 7714 Meng, Guodong , Cheng, Yonghong , Dong, Chengye et al. Role of thermal properties of cathode materials for the nanoscale breakdown in vacuum [C] . 2018 .
MLA Meng, Guodong et al. "Role of thermal properties of cathode materials for the nanoscale breakdown in vacuum" . (2018) .
APA Meng, Guodong , Cheng, Yonghong , Dong, Chengye , Gao, Xinyu , Zhang, Dujiao , Wang, Kejing et al. Role of thermal properties of cathode materials for the nanoscale breakdown in vacuum . (2018) .
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