The Experts below are selected from a list of 14025 Experts worldwide ranked by ideXlab platform
Tao Wang - One of the best experts on this subject based on the ideXlab platform.
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high frequency electromagnetic properties of soft magnetic nd2co17 micron flakes fractured along c crystal plane with natural resonance frequency exceeding 10 ghz
Applied Physics Letters, 2016Co-Authors: Yongbo Zhang, Liang Qiao, Peng Wang, Ying Wang, Tao WangAbstract:Planar anisotropy Nd2Co17 flakes fractured along c crystal plane were fabricated by surfactant-assisted high-energy ball Milling Technique. The magnetic flakes have a diameter range of 5–20 μm and a typical thickness of approximately 120 nm. The frequency dependence of complex permeability of Nd2Co17 epoxy resin composite has been investigated in the frequency range of 0.1–18 GHz. The measurement results show that the natural resonance frequency reaches 12.5 GHz while the initial permeability survives up to 2.26. The superior high frequency properties come from the large out-of-plane anisotropy field and the flake structure fractured along the c crystal plane of Nd2Co17. The planar anisotropic Nd2Co17 flakes have significant potential applications in the high-frequency devices working in the frequency beyond 10 GHz.
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complex permeability and microwave absorbing properties of planar anisotropy carbonyl iron ni0 5zn0 5fe2o4 composite in quasimicrowave band
Materials Chemistry and Physics, 2012Co-Authors: Rui Han, Tao Wang, Lu-qian Gong, Liang QiaoAbstract:Abstract Planar anisotropy carbonyl-iron (PACI)/Ni 0.5 Zn 0.5 Fe 2 O 4 composite as absorbent filler in quasimicrowave band has been synthesized via ball-Milling Technique and solvothermal method. The effective permeability of the composite was measured and calculated. The result indicates that the magnetic loss in the composite is mainly caused by the natural resonance. Compared with the uncoated PACI particles, the permittivity of the composite decreased dramatically, and hence a dramatic enhancement of reflection loss (RL) was obtained in quasimicrowave band. This result indicates that our PACI/ferrite composite can be used as potential microwave absorbers in quasimicrowave band for its novel microwave properties.
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Microwave complex permeability of planar anisotropy carbonyl-iron particles
Journal of Alloys and Compounds, 2011Co-Authors: Rui Han, Liang Qiao, Tao WangAbstract:Abstract Planar anisotropy carbonyl-iron (PACI) particles were prepared from sphere-shaped carbonyl-iron (SSCI) materials by a simple ball Milling Technique. The frequency-dependent complex permeability of paraffin composites with 50% volume concentration of particles has been investigated in 0.1–18 GHz frequency range. The as-milled PACI composites show a dramatic enhancement of complex permeability and a higher resonance frequency compared with SSCI composite. This is due to the PACI particles, which have an easy magnetization plane and a thickness smaller than their skin depth, suppressing the eddy current effects. Furthermore, the complex permeability is further improved after the PACI composite was rotationally orientated in an external magnetic field. The real permeability of oriented PACI composite reaches a large value of approximate 10.5 at 0.1 GHz, and the resonance frequency shifts to a higher frequency range.
Stefan Zaefferer - One of the best experts on this subject based on the ideXlab platform.
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anisotropic distribution of the micro residual stresses in lath martensite revealed by fib ring core Milling Technique
Acta Materialia, 2018Co-Authors: Fady Mamdouh Fawzy Archie, Muhammad Zeeshan Mughal, Edoardo Bemporad, Marco Sebastiani, Stefan ZaeffererAbstract:Abstract Lath martensite structures in medium-carbon steels incorporate a significant amount of residual stresses that are mostly induced by the martensitic transformation process. Although former studies could identify these stresses using diffraction Techniques, it was not possible to correlate the micro-scale distribution of the stress fields with respect to the morphological and the crystallographic parameters of the martensitic structure. In this study, we employ the micro-scale focused ion beam (FIB) ring-core Milling Technique for the measurement of local residual strain and stress distributions in fully martensitic microstructures. The aim is to study the residual stresses occurring within individual lath martensite crystals, and within areas of lath martensite which incorporate a parent austenite grain boundary. The relaxation strains obtained by the micrometer-sized ring-core Milling, which correspond to the residual stresses prior to Milling, are shown to exhibit an anisotropic distribution for each martensite variant. High extension relaxation strains (i.e. compressive stresses) prevail in the direction of the transformation-induced crystal shape deformation direction. Contraction strains (i.e. tensile residual stresses) are measured normal to the extension strains. In an area containing a prior austenite grain boundary, the residual stresses appeared – altogether – lower than in single crystal martensite laths. The significant residual tensile stresses identified in the martensite structures may support the formation of martensite micro-cracks, either in the as-quenched state or during deformation.
Liang Qiao - One of the best experts on this subject based on the ideXlab platform.
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high frequency electromagnetic properties of soft magnetic nd2co17 micron flakes fractured along c crystal plane with natural resonance frequency exceeding 10 ghz
Applied Physics Letters, 2016Co-Authors: Yongbo Zhang, Liang Qiao, Peng Wang, Ying Wang, Tao WangAbstract:Planar anisotropy Nd2Co17 flakes fractured along c crystal plane were fabricated by surfactant-assisted high-energy ball Milling Technique. The magnetic flakes have a diameter range of 5–20 μm and a typical thickness of approximately 120 nm. The frequency dependence of complex permeability of Nd2Co17 epoxy resin composite has been investigated in the frequency range of 0.1–18 GHz. The measurement results show that the natural resonance frequency reaches 12.5 GHz while the initial permeability survives up to 2.26. The superior high frequency properties come from the large out-of-plane anisotropy field and the flake structure fractured along the c crystal plane of Nd2Co17. The planar anisotropic Nd2Co17 flakes have significant potential applications in the high-frequency devices working in the frequency beyond 10 GHz.
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complex permeability and microwave absorbing properties of planar anisotropy carbonyl iron ni0 5zn0 5fe2o4 composite in quasimicrowave band
Materials Chemistry and Physics, 2012Co-Authors: Rui Han, Tao Wang, Lu-qian Gong, Liang QiaoAbstract:Abstract Planar anisotropy carbonyl-iron (PACI)/Ni 0.5 Zn 0.5 Fe 2 O 4 composite as absorbent filler in quasimicrowave band has been synthesized via ball-Milling Technique and solvothermal method. The effective permeability of the composite was measured and calculated. The result indicates that the magnetic loss in the composite is mainly caused by the natural resonance. Compared with the uncoated PACI particles, the permittivity of the composite decreased dramatically, and hence a dramatic enhancement of reflection loss (RL) was obtained in quasimicrowave band. This result indicates that our PACI/ferrite composite can be used as potential microwave absorbers in quasimicrowave band for its novel microwave properties.
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Microwave complex permeability of planar anisotropy carbonyl-iron particles
Journal of Alloys and Compounds, 2011Co-Authors: Rui Han, Liang Qiao, Tao WangAbstract:Abstract Planar anisotropy carbonyl-iron (PACI) particles were prepared from sphere-shaped carbonyl-iron (SSCI) materials by a simple ball Milling Technique. The frequency-dependent complex permeability of paraffin composites with 50% volume concentration of particles has been investigated in 0.1–18 GHz frequency range. The as-milled PACI composites show a dramatic enhancement of complex permeability and a higher resonance frequency compared with SSCI composite. This is due to the PACI particles, which have an easy magnetization plane and a thickness smaller than their skin depth, suppressing the eddy current effects. Furthermore, the complex permeability is further improved after the PACI composite was rotationally orientated in an external magnetic field. The real permeability of oriented PACI composite reaches a large value of approximate 10.5 at 0.1 GHz, and the resonance frequency shifts to a higher frequency range.
Colleen Ruegger - One of the best experts on this subject based on the ideXlab platform.
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optimization of formulation and process parameters for the production of nanosuspension by wet media Milling Technique effect of vitamin e tpgs and nanocrystal particle size on oral absorption
European Journal of Pharmaceutical Sciences, 2012Co-Authors: Indrajit Ghosh, Daniel Schenck, Sonali Bose, Colleen RueggerAbstract:Abstract The purpose of this study was to develop nanosuspension formulations of a poorly soluble drug using a wet media Milling Technique. The Milling process was optimized by studying the effects of critical process parameters on the size of nanoparticles using a factorial design approach. During the design of experiments (DOEs) study, different concentrations of Vitamin E TPGS in the suspensions were used to evaluate its influence on the stabilization of a nanosuspension. Once the final formulation was optimized, a pharmacokinetic study was performed in beagle dogs to investigate the effect of different ranges of particle size of nanocrystals on the plasma profile. A significant increase in AUC and Cmax was observed when the drug substance was converted into nanocrystals, likely due to the increase in dissolution rate. Results also revealed that the nanosuspension formulation (consists of nanocrystals with narrow size distribution, having a mean particle size
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optimization of formulation and process parameters for the production of nanosuspension by wet media Milling Technique effect of vitamin e tpgs and nanocrystal particle size on oral absorption
European Journal of Pharmaceutical Sciences, 2012Co-Authors: Indrajit Ghosh, Daniel Schenck, Sonali Bose, Colleen RueggerAbstract:The purpose of this study was to develop nanosuspension formulations of a poorly soluble drug using a wet media Milling Technique. The Milling process was optimized by studying the effects of critical process parameters on the size of nanoparticles using a factorial design approach. During the design of experiments (DOEs) study, different concentrations of Vitamin E TPGS in the suspensions were used to evaluate its influence on the stabilization of a nanosuspension. Once the final formulation was optimized, a pharmacokinetic study was performed in beagle dogs to investigate the effect of different ranges of particle size of nanocrystals on the plasma profile. A significant increase in AUC and C(max) was observed when the drug substance was converted into nanocrystals, likely due to the increase in dissolution rate. Results also revealed that the nanosuspension formulation (consists of nanocrystals with narrow size distribution, having a mean particle size<300 nm) produced less variability with regards to the individual plasma concentrations in the dogs when compared an alternate nanocrystal formulation (consists of nanocrystals with broad size distribution having a mean particle size<750 nm). This type of observation can be explained due to the Ostwald ripening phenomena between the nanocrystals when the particle size distribution was very broad (higher poly dispersity index). Surprisingly, the un-micronized suspension containing Vitamin E TPGS did not show any significant impact on pharmacokinetic parameters.
Jinzhi Liao - One of the best experts on this subject based on the ideXlab platform.
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mixing of carbon nanotubes cnts and aluminum powder for powder metallurgy use
Powder Technology, 2011Co-Authors: Jinzhi LiaoAbstract:In recent years, carbon nanotubes (CNTs) reinforced aluminum matrix composites (AMCs) have attracted increasing attention. The quality of dispersion, however, is a crucial factor which determines the homogeneity and final mechanical properties of these composites. This work studied the mechanical mixing methods, viz. high energy and low energy ball Millings, and compared them to a novel polyester binder-assisted (PBA) mixing method. Experimental results showed that the high energy and low energy ball-milled CNTs disintegrated and there were residual stresses, unlike the PBA-CNTs. The CNT dispersion conditions by these three methods were discussed. The Al-CNTs mixture was subsequently consolidated by powder metallurgy (PM) Technique. Small addition of CNTs (0.5 wt.%) evidently improved the tensile strength and hardness of the composite by comparing with the pure matrix. Mechanical property enhancements of the Al-0.5CNT composites from PBA and high energy ball Milling were superior to that mixed by low energy ball Milling. This showed good dispersion effect in PBA and high energy ball Milling Technique.
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mixing of carbon nanotubes cnts and aluminum powder for powder metallurgy use
Powder Technology, 2011Co-Authors: Jinzhi Liao, Ming Jen TanAbstract:In recent years, carbon nanotubes (CNTs) reinforced aluminum matrix composites (AMCs) have attracted increasing attention. The quality of dispersion, however, is a crucial factor which determines the homogeneity and final mechanical properties of these composites. This work studied the mechanical mixing methods, viz. high energy and low energy ball Millings, and compared them to a novel polyester binder-assisted (PBA) mixing method. Experimental results showed that the high energy and low energy ball-milled CNTs disintegrated and there were residual stresses, unlike the PBA-CNTs. The CNT dispersion conditions by these three methods were discussed. The Al-CNTs mixture was subsequently consolidated by powder metallurgy (PM) Technique. Small addition of CNTs (0.5 wt.%) evidently improved the tensile strength and hardness of the composite by comparing with the pure matrix. Mechanical property enhancements of the Al-0.5CNT composites from PBA and high energy ball Milling were superior to that mixed by low energy ball Milling. This showed good dispersion effect in PBA and high energy ball Milling Technique.
