Fluidized beds have been widely used for processing granular materials. In this paper, we study the effect of plasma on the fluidization behavior of a bubbling fluidized bed with an atmospheric pressure plasma dischar...Fluidized beds have been widely used for processing granular materials. In this paper, we study the effect of plasma on the fluidization behavior of a bubbling fluidized bed with an atmospheric pressure plasma discharger. Experiment results show that the bubbling fluidized bed is stabilized with the discharge of plasma. When the discharge current reaches a minimum stabilization current Cms, air bubbles in the bed will disappear and the surface fluctuation is completely suppressed.A simplified model is proposed to consider the effect of electric Coulomb force generated by the plasma. It is found that the Coulomb force will propel the particles to move towards the void area, so that the bubbling fluidized bed is stabilized with a high enough plasma discharge.展开更多
The alloying effect of cerium in low carbon granular bainitic steel has been studied. Cerium increases the incubation time of granular bainitic transformation, exerts an influence on the morphology of nucleation and g...The alloying effect of cerium in low carbon granular bainitic steel has been studied. Cerium increases the incubation time of granular bainitic transformation, exerts an influence on the morphology of nucleation and growth of bainitic transformation, and refines the structure of normalized granular bainite.展开更多
In a set of vibrating quasi-two-dimensional containers with the right-hand sidewall bent inward, three new segregation patterns have been identified experimentally including a Two-Side segregation Pattern, a Left-hand...In a set of vibrating quasi-two-dimensional containers with the right-hand sidewall bent inward, three new segregation patterns have been identified experimentally including a Two-Side segregation Pattern, a Left-hand Side segregation Pattern and a pattern where big particles aggregate to the upper left part of the container. In a container with small bending degree, either the two-side segregation pattern or the left-hand side segregation pattern is stable, which is determined by the initial distribution of particles.展开更多
Molecular dynamics simulations are employed to investigate the effect of thermal convection induced only by dissipative lateral walls on density segregation of the strongly driven binary granular gases under low gravi...Molecular dynamics simulations are employed to investigate the effect of thermal convection induced only by dissipative lateral walls on density segregation of the strongly driven binary granular gases under low gravity conditions. It is found that the thermal convection due to dissipative lateral walls has significant influence on the segregation intensity of the system. The dominant factor in determining the degree of segregation achieved by the system is found to be the relative convection rate between differing species. Moreover, a qualitative explanation is proposed for the relationship between the thermal convection due to dissipative lateral walls and the observed segregation intensity profiles.展开更多
Optimization of composition and microstructure is important to enhance performance of solid oxide fuel cells （SOFC） and lithium-ion batteries （LIB）. For this, the porous electrode structures of both SOFC and LIB a...Optimization of composition and microstructure is important to enhance performance of solid oxide fuel cells （SOFC） and lithium-ion batteries （LIB）. For this, the porous electrode structures of both SOFC and LIB are modeled as a binary mixture of electronic and ionic conducting particles to estimate effective transport properties. Particle packings of 10000 spherical, binary sized and randomly positioned particles are created numerically and densified considering the different manufacturing processes in SOFC and LIB： the sintering of SOFC electrodes is approximated geometrically, whereas the calendering process and volume change due to intercalation in LIB are modeled physically by a discrete el- ement approach. A combination of a tracking algorithm and a resistor network approach is developed to predict the con- nectivity and effective conductivity for the various densified structures. For SOFC, a systematic study of the influence of morphology on connectivity and conductivity is performed on a large number of assemblies with different compositions and particle size ratios between 1 and 10. In comparison to percolation theory, an enlarged percolation area is found, es- pecially for large size ratios. It is shown that in contrast to former studies the percolation threshold correlates to varying coordination numbers. The effective conductivity shows not only an increase with volume fraction as expected but also with size ratio. For LIB, a general increase of conductivity during the intercalation process was observed in correlation with increasing contact forces. The positive influence of cal- endering on the percolation threshold and the effective conductivity of carbon black is shown. The anisotropy caused by the calendering process does not influence the carbon black phase.展开更多
We examine the interferometry results of identical pion and kaon for the granular sources of quark-gluon plasma droplets for the Au + Au collisions at S_(NN)^(1/2) = 200 GeV.The effects of particle absorptions of pion...We examine the interferometry results of identical pion and kaon for the granular sources of quark-gluon plasma droplets for the Au + Au collisions at S_(NN)^(1/2) = 200 GeV.The effects of particle absorptions of pion and kaon on the results are investigated.We find that the absorptions lead to the decrease of the interferometry radii.After considering the absorptions,the interferometry radii of pion and kaon of the granular sources are in better agreement with the experimental data of the Au + Au collisions.展开更多
充足的骨组织是保证种植体长期稳定性的先决条件。Urban教授提出了基于引导骨再生(guided bone regeneration,GBR)原理的“香肠技术”。研究显示,该技术在牙槽骨水平向增量方面达(5.3±2.3)mm,垂直向增量为(4.2±1.9)mm,显著优...充足的骨组织是保证种植体长期稳定性的先决条件。Urban教授提出了基于引导骨再生(guided bone regeneration,GBR)原理的“香肠技术”。研究显示,该技术在牙槽骨水平向增量方面达(5.3±2.3)mm,垂直向增量为(4.2±1.9)mm,显著优于传统GBR方法。香肠技术利用生物膜的弹性与韧性,结合膜钉固定,将自体骨与骨移植材料稳定在植骨区域,有效防止移位并增强空间稳定性。骨替代材料和自体骨的使用兼顾了自体骨的成骨活性和骨替代材料的低吸收速率;在受区的皮质骨使用球钻进行滋养孔的制备,为间充质干细胞和骨祖细胞向骨再生区域迁移提供了通路,同时也可以加速创口愈合早期新生血管生成;充分减张缝合,以确保在缝合时不对愈合区域施加过大的压力。这有效提高了香肠技术的可预测性。尽管该技术疗效显著,但潜在的软硬组织并发症可能影响患者恢复及手术结果。因此,深入探讨其并发症及诱因,对于提升香肠技术的临床安全性和有效性具有重要意义。本文总结了香肠技术的应用原理、临床效果、屏障膜的应用、骨移植材料的选择及并发症防治,旨在为其在口腔种植领域的广泛应用提供参考。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11035005 and 11034010)
文摘Fluidized beds have been widely used for processing granular materials. In this paper, we study the effect of plasma on the fluidization behavior of a bubbling fluidized bed with an atmospheric pressure plasma discharger. Experiment results show that the bubbling fluidized bed is stabilized with the discharge of plasma. When the discharge current reaches a minimum stabilization current Cms, air bubbles in the bed will disappear and the surface fluctuation is completely suppressed.A simplified model is proposed to consider the effect of electric Coulomb force generated by the plasma. It is found that the Coulomb force will propel the particles to move towards the void area, so that the bubbling fluidized bed is stabilized with a high enough plasma discharge.
文摘The alloying effect of cerium in low carbon granular bainitic steel has been studied. Cerium increases the incubation time of granular bainitic transformation, exerts an influence on the morphology of nucleation and growth of bainitic transformation, and refines the structure of normalized granular bainite.
基金Project supported by the National Natural Science Foundation of China （Grant No 10274074）, and the Australian Research Council through a Discovery Project Grant.
文摘In a set of vibrating quasi-two-dimensional containers with the right-hand sidewall bent inward, three new segregation patterns have been identified experimentally including a Two-Side segregation Pattern, a Left-hand Side segregation Pattern and a pattern where big particles aggregate to the upper left part of the container. In a container with small bending degree, either the two-side segregation pattern or the left-hand side segregation pattern is stable, which is determined by the initial distribution of particles.
基金Supported by the National Natural Science Foundation of China under Grant No 11404104the Natural Science Foundation of Hubei Province of China under Grant No 2014CFC1127
文摘Molecular dynamics simulations are employed to investigate the effect of thermal convection induced only by dissipative lateral walls on density segregation of the strongly driven binary granular gases under low gravity conditions. It is found that the thermal convection due to dissipative lateral walls has significant influence on the segregation intensity of the system. The dominant factor in determining the degree of segregation achieved by the system is found to be the relative convection rate between differing species. Moreover, a qualitative explanation is proposed for the relationship between the thermal convection due to dissipative lateral walls and the observed segregation intensity profiles.
基金supported by the Helmholtz Portfolio "elektrochemische Speicher",particularly the work related to lithium-ion batteriespartially supported as part of the HeteroFoam Center,an Energy Frontier Research Center funded by the U.S.Department of Energy,Office of Science, Basic Energy Sciences(DE-SC0001061)+1 种基金support from the Center for Scientific Computing at the CNSI and MRL:an NSF MRSEC(DMR-1121053) and NSF (CNS-0960316)Australian Research Council Grant DE130101639
文摘Optimization of composition and microstructure is important to enhance performance of solid oxide fuel cells （SOFC） and lithium-ion batteries （LIB）. For this, the porous electrode structures of both SOFC and LIB are modeled as a binary mixture of electronic and ionic conducting particles to estimate effective transport properties. Particle packings of 10000 spherical, binary sized and randomly positioned particles are created numerically and densified considering the different manufacturing processes in SOFC and LIB： the sintering of SOFC electrodes is approximated geometrically, whereas the calendering process and volume change due to intercalation in LIB are modeled physically by a discrete el- ement approach. A combination of a tracking algorithm and a resistor network approach is developed to predict the con- nectivity and effective conductivity for the various densified structures. For SOFC, a systematic study of the influence of morphology on connectivity and conductivity is performed on a large number of assemblies with different compositions and particle size ratios between 1 and 10. In comparison to percolation theory, an enlarged percolation area is found, es- pecially for large size ratios. It is shown that in contrast to former studies the percolation threshold correlates to varying coordination numbers. The effective conductivity shows not only an increase with volume fraction as expected but also with size ratio. For LIB, a general increase of conductivity during the intercalation process was observed in correlation with increasing contact forces. The positive influence of cal- endering on the percolation threshold and the effective conductivity of carbon black is shown. The anisotropy caused by the calendering process does not influence the carbon black phase.
基金supported by the National Natural Science Foundation of China(No.11275037)
文摘We examine the interferometry results of identical pion and kaon for the granular sources of quark-gluon plasma droplets for the Au + Au collisions at S_(NN)^(1/2) = 200 GeV.The effects of particle absorptions of pion and kaon on the results are investigated.We find that the absorptions lead to the decrease of the interferometry radii.After considering the absorptions,the interferometry radii of pion and kaon of the granular sources are in better agreement with the experimental data of the Au + Au collisions.
文摘充足的骨组织是保证种植体长期稳定性的先决条件。Urban教授提出了基于引导骨再生(guided bone regeneration,GBR)原理的“香肠技术”。研究显示,该技术在牙槽骨水平向增量方面达(5.3±2.3)mm,垂直向增量为(4.2±1.9)mm,显著优于传统GBR方法。香肠技术利用生物膜的弹性与韧性,结合膜钉固定,将自体骨与骨移植材料稳定在植骨区域,有效防止移位并增强空间稳定性。骨替代材料和自体骨的使用兼顾了自体骨的成骨活性和骨替代材料的低吸收速率;在受区的皮质骨使用球钻进行滋养孔的制备,为间充质干细胞和骨祖细胞向骨再生区域迁移提供了通路,同时也可以加速创口愈合早期新生血管生成;充分减张缝合,以确保在缝合时不对愈合区域施加过大的压力。这有效提高了香肠技术的可预测性。尽管该技术疗效显著,但潜在的软硬组织并发症可能影响患者恢复及手术结果。因此,深入探讨其并发症及诱因,对于提升香肠技术的临床安全性和有效性具有重要意义。本文总结了香肠技术的应用原理、临床效果、屏障膜的应用、骨移植材料的选择及并发症防治,旨在为其在口腔种植领域的广泛应用提供参考。
