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< Page ,Total 134 >
Macro Bending Effect in Optical Fiber Composite Low Voltage Cable EI 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 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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A 50Gb/s-PAM4 CDR with On-Chip Eye Opening Monitor for Reference-Level and Clock-Sampling Adaptation CPCI-S CSSCI-E
会议论文 | 2018 | Optical Fiber Communications Conference and Exposition (OFC)
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Abstract :

A 50Gb/s-PAM4 Clock/Data Recovery (CDR) transceiver is designed in a 40nm-CMOS process. An on-chip Eye Opening Monitor (EOM) is introduced that enables adaptive reference level and timing sampling placement for non-uniform and distorted PAM4-inputs.

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GB/T 7714 Chang, Liu , Yin, Bozhi , Yao, Tingyu et al. A 50Gb/s-PAM4 CDR with On-Chip Eye Opening Monitor for Reference-Level and Clock-Sampling Adaptation [C] . 2018 .
MLA Chang, Liu et al. "A 50Gb/s-PAM4 CDR with On-Chip Eye Opening Monitor for Reference-Level and Clock-Sampling Adaptation" . (2018) .
APA Chang, Liu , Yin, Bozhi , Yao, Tingyu , Qi, Nan , Li, Dan , Shi, Jingbo et al. A 50Gb/s-PAM4 CDR with On-Chip Eye Opening Monitor for Reference-Level and Clock-Sampling Adaptation . (2018) .
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Radiation Effect on the Electron Transport Properties of SiO2/Si Interface: Role of Si Dangling-Bond Defects and Oxygen Vacancy EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

Radiation effect of electronic devices is a complex issue that attracted a lot of interest in the area of aviation industry and nuclear engineering. In order to investigate the relationship between structure damage and electrical performance of electronic devices, first-principle modeling and calculations were carried out to link SiO2/Si interfacial defect states and electron transport properties of electronic devices. We found that the oxygen vacancy (V-O) is much more easier to form than silicon vacancy (VSi) under the radiation environment. The band structure shows that two defect levels were localized inside the band gap of the SiO2/Si interface, approximately 0.19 eV and 0.25 eV below the conduction band minimum (CBM) as electronic traps, which were induced by a Si dangling bond defects. The VO as the donor defect makes the interface restructuring and chemical bond changing, which leads to the defect level crossing the Fermi level (EF). Oxygen atoms of SiO2 at the interface act as a potential well to keep electrons from tunneling. The barrier for carriers disappear after oxygen atom being moved, which will reduce the electrical gain and breakdown strength of devices. Our results gave a physical interpretation to the relationship between defects and electrical performance of electronic materials and indicated that the dangling bonds and VO at the interface are needed to be suppressed generating in order to harden the electronic devices.

Keyword :

electronic structure radiation damage dangling-bonds defects SiO2/Si first principle calculation interface oxygen vacancy

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GB/T 7714 Qu, Guanghao , Min, Daomin , Zhao, Zhonghua et al. Radiation Effect on the Electron Transport Properties of SiO2/Si Interface: Role of Si Dangling-Bond Defects and Oxygen Vacancy [C] . 2018 .
MLA Qu, Guanghao et al. "Radiation Effect on the Electron Transport Properties of SiO2/Si Interface: Role of Si Dangling-Bond Defects and Oxygen Vacancy" . (2018) .
APA Qu, Guanghao , Min, Daomin , Zhao, Zhonghua , Frechette, Michel , Li, Shengtao . Radiation Effect on the Electron Transport Properties of SiO2/Si Interface: Role of Si Dangling-Bond Defects and Oxygen Vacancy . (2018) .
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Preparation and Characterization of Epoxy and Hollow Ceramic Spheres Composites EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

High crash strength and high thermal conductivity hollow ceramic sphere with external diameters between 250 and 420 micrometers were produced by firing green bodies prepared in a fluidized reactor at room temperature. Then these spheres were bonded together by epoxy resin to produce composites with very high filler concentration but light weight. The dielectric, thermal and mechanical properties of the composites were investigated. Because the component in the raw materials of hollow ceramic spheres is varied, the corresponding composites have tunable permittivity and dielectric loss. In the composites, hollow ceramic spheres are nearly close packed, which can be observed by optical microscope. The novel close packed structure of these spheres endows the composites with highly efficient pathways for heat dissipation and reliable framework of bearing compressive loading. The surfaces of the spheres were modified by 1wt. % silane coupling agent, KH-560, before combining with epoxy resin in order to improve their chemical compatibility with epoxy resin. With TGA results, we can see that the epoxy resin in the composites has a low percentage of mass ratios and thus plays a role as binder to combine neighboring hollow ceramic spheres together. The results demonstrate improvement of dielectric and thermal conducting properties of epoxy resin, and feasibility of extending its working ranges in both compression strength and temperature as a multifunctional material in insulating area.

Keyword :

Compressive strength Composites Thermal conductivity Ceramic spheres

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GB/T 7714 Jiang, Fan , Li, Zhihui , Niu, Chunming . Preparation and Characterization of Epoxy and Hollow Ceramic Spheres Composites [C] . 2018 .
MLA Jiang, Fan et al. "Preparation and Characterization of Epoxy and Hollow Ceramic Spheres Composites" . (2018) .
APA Jiang, Fan , Li, Zhihui , Niu, Chunming . Preparation and Characterization of Epoxy and Hollow Ceramic Spheres Composites . (2018) .
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Numerical Simulation of Gas Breakdown in Microgaps Based on PIC/MCC Method EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

Paschen's curve which is based on Townsend effects has been used to describe the gas breakdown voltage until more and more experiments has shown that it is not entirely accurate in describing breakdown when the electrode gaps less than 10 mu m. Thus it is of great significance to study the microscale gaps breakdown law and the discharge mechanism of insulation structure in micro-electronic components. In this work, numerical experiments using the particle-in-cell/Monte Carlo collisions method are used to simulate the process of microgap discharge in the air. The variation of the number of charged particles, the current intensity and the electric field distribution are taken as the criteria of breakdown to analyze the breakdown characteristics in microgaps and the points of time determined by different criteria are basically the same. Furthermore, field emission and thermionic emission have different contributions to the entire electron emission from the cathode under different applied voltages and cathode temperatures. The series of experimental results can provide further theoretical guidance for the physical mechanism of microscale dielectric breakdown.

Keyword :

Particle-in-cell method microscale gaps gas breakdown electron emission

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GB/T 7714 Gao, Xinyu , Meng, Guodong , Wang, Kejing et al. Numerical Simulation of Gas Breakdown in Microgaps Based on PIC/MCC Method [C] . 2018 .
MLA Gao, Xinyu et al. "Numerical Simulation of Gas Breakdown in Microgaps Based on PIC/MCC Method" . (2018) .
APA Gao, Xinyu , Meng, Guodong , Wang, Kejing , Zhang, Dujiao , Dong, Chengye , Li, Nan et al. Numerical Simulation of Gas Breakdown in Microgaps Based on PIC/MCC Method . (2018) .
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Effect of moisture absorption on dielectric properties of polypropylene-based blend EI 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 EI 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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Effect of Interfacial Pressure on Electrical Tree between XLPE and Silicone Rubber EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 | 2nd IEEE International Conference on Dielectrics (ICD)
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Abstract :

XLPE and silicone rubber (SIR) have been widely used in power cables and accessories for their excellent mechanical and electrical performance. However, the interface between them in accessories remains one of the weakest parts in the cable system. Electrical treeing is an important destructive factor for HV insulation structures, and it always leads to final breakdown. Therefore, it is essential to investigate the effects of interfacial pressure on electrical tree. In this paper, tests were carried out by pressing XLPE and SIR samples together under different interfacial pressures with a specific pressing device. AC voltage was applied on a pair of pin-plane electrodes placed at the interface. The pin-plane distance was 2 mm. The needle diameter was 0.25 mm and the tip curvature radius was (10 +/- 1) mu m. Under different interfacial pressures, the voltages for electrical trees to initiate were recorded and statistically analyzed. Meanwhile, the tree morphology and breakdown channel were also captured by using a digital micro-imaging system. The results show that at a low interfacial pressure of 50 kPa, no electrical trees can be observed. Instead, discharge light can be seen at the interface. As the interfacial pressure increases, electrical tree begins to appear. It is found that at 75 kPa, electrical tree initiates and grows, which finally leads to a severe breakdown along the interface. While at pressures above 100 kPa, electrical tree tends to grow into SIR side, and the breakdown channel is slender, only observed in the SIR. Besides, the electrical tree initiation voltage increases with the increase of the interfacial pressure. It indicates that a high interfacial pressure can effectively delay the initiation of electrical trees, and for the two materials that constitute the interface, XLPE seems to have a better electrical treeing endurance than the SIR.

Keyword :

XLPE cable accessory silicone rubber electrical tree interfacial pressure

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GB/T 7714 Su, Yu , Liu, Ying , Xie, Dongri et al. Effect of Interfacial Pressure on Electrical Tree between XLPE and Silicone Rubber [C] . 2018 .
MLA Su, Yu et al. "Effect of Interfacial Pressure on Electrical Tree between XLPE and Silicone Rubber" . (2018) .
APA Su, Yu , Liu, Ying , Xie, Dongri , Zhong, Lisheng . Effect of Interfacial Pressure on Electrical Tree between XLPE and Silicone Rubber . (2018) .
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