已有的混凝土平面应力有限元分析均是利用单轴应力-应变本构关系,其中经验系数的选取带有相当的主观色彩,因此十分有必要建立混凝土在多轴应力特别是二维应力状态下的本构关系并直接应用于非线性分析.基于连续损伤力学的理论框架,作者...已有的混凝土平面应力有限元分析均是利用单轴应力-应变本构关系,其中经验系数的选取带有相当的主观色彩,因此十分有必要建立混凝土在多轴应力特别是二维应力状态下的本构关系并直接应用于非线性分析.基于连续损伤力学的理论框架,作者建立了理论上较为完备、应用较为简单的确定性混凝土拉剪弹塑性损伤本构模型.模型数值模拟和已有试验结果的对比表明,本文建议模型能够很好的描述双轴应力条件下混凝土材料的弹性区域包络线以及强度包络线,同时应力-应变全过程结果和Kupfer (Kupfer et al.1969)的试验结果吻合良好,能够很好的模拟混凝土双轴受压强度的提高和双轴拉压应力状态下的"拉压软化效应",这对混凝土结构的非线性分析是非常重要的.展开更多
Postcolonial theory is a well-established critical approach that addresses issues such as the quest for identity, the significance of land, homelessness, resistance, and the encounter between the colonized and the col...Postcolonial theory is a well-established critical approach that addresses issues such as the quest for identity, the significance of land, homelessness, resistance, and the encounter between the colonized and the colonizers. This paper examines the postcolonial elements utilized by the Anglo-Jordanian novelist Fadia Faqir in her novel Pillars of Salt. It discusses the novel＇s themes and techniques associated with postcolonialism as a literary theory and as a critical approach. Being a postcolonial text, the novel shows the writer＇s attempt at writing back in response to the colonial past with its power structures and social hierarchies. Thematically, the novel is analyzed with special reference to such topics as the subaltern, Anglo-Jordanian ties, language, othemess, and identity. The paper also traces the continuity of postcolonial discourse in Faqir＇s novel and gives a short survey of the historical events that provide the background to the main events in this essentially postcolonial work.展开更多
A mistake in Proposition I-1.21.1 of 'A Compendium of Continuous Lattices'by G.Giers et al. is pointed out and a revised proposition with a proof is given.
The concepts of hypercontinuous posets and generalized completely continuous posets are introduced. It is proved that for a poset P the following three conditions are equivalent:(1) P is hypercontinuous;(2) the dual o...The concepts of hypercontinuous posets and generalized completely continuous posets are introduced. It is proved that for a poset P the following three conditions are equivalent:(1) P is hypercontinuous;(2) the dual of P is generalized completely continuous;(3) the normal completion of P is a hypercontinuous lattice. In addition, the relational representation and the intrinsic characterization of hypercontinuous posets are obtained.展开更多
In this paper,a phenomenological continuum theory of surface piezoelectricity accounting for the linear superficial interplay between electricity and elasticity is formulated primarily for elastic dielectric materials...In this paper,a phenomenological continuum theory of surface piezoelectricity accounting for the linear superficial interplay between electricity and elasticity is formulated primarily for elastic dielectric materials.This theory is inspired by the physical idea that once completely relaxed,an insulating free dielectric surface will sustain a nontrivial spontaneous surface polarization in the normal direction together with a tangential self-equilibrated residual surface stress field.Under external loadings,the surface Helmholtz free energy density is identified as the characteristic function of such surfaces,with the in-plane strain tensor of surface and the surface free charge density as the independent state variables.New boundary conditions governing the surface piezoelectricity are derived through the variational method.The resulting concepts of charge-dependent surface stress and deformationdependent surface electric field reflect the linear electromechanical coupling behavior of nanodielectric surfaces.As an illustrative example,an infinite radially polarizable piezoelectric nanotube with both inner and outer surfaces grounded is investigated.The novel phenomenon of possible surface-induced polarity inversion is predicted for thin enough nanotubes.展开更多
We study uncertainty and certainty relations for two successive measurements of two-dimensional observables. Uncertainties in successive measurement are considered within the following two scenarios. In the first scen...We study uncertainty and certainty relations for two successive measurements of two-dimensional observables. Uncertainties in successive measurement are considered within the following two scenarios. In the first scenario, the second measurement is performed on the quantum state generated affer the first measurement with completely erased information. In the second scenario, the second measurement is performed on the post-first- tioned on the actual measurement outcome. Induced entropies. For two successive projective t state condiquantum uncertainties are characterized by means of the Tsallis t of a qubit, we obtain minimal and maximal values of related entropic measures of induced uncertainties. Some conclusions found in the second scenario are extended to arbitrary finite dimensionality. In particular, a connection with mutual unbiasedness is emphasized.展开更多
This paper considers the fed-batch culture in microbial fermentation process, which consists of batch and continuous culture. The goal is to explore the properties of a novel model which can describe the characteristi...This paper considers the fed-batch culture in microbial fermentation process, which consists of batch and continuous culture. The goal is to explore the properties of a novel model which can describe the characteristics of multistage for the population growth of microorganisms in nonlinear switch dynamic system. The improved model is developed based on the experimental data to describe the delayed, developmental and stationary stages well for the phases of batch culture. Then the existence, uniqueness and boundedness of solutions to the nonlinear multistage switch system and the Lipschitz continuity and differentiability of solutions with respect to the initial state is discussed as well. Finally, a numerical simulation is employed for the nonlinear multistage switch system.展开更多
文摘已有的混凝土平面应力有限元分析均是利用单轴应力-应变本构关系,其中经验系数的选取带有相当的主观色彩,因此十分有必要建立混凝土在多轴应力特别是二维应力状态下的本构关系并直接应用于非线性分析.基于连续损伤力学的理论框架,作者建立了理论上较为完备、应用较为简单的确定性混凝土拉剪弹塑性损伤本构模型.模型数值模拟和已有试验结果的对比表明,本文建议模型能够很好的描述双轴应力条件下混凝土材料的弹性区域包络线以及强度包络线,同时应力-应变全过程结果和Kupfer (Kupfer et al.1969)的试验结果吻合良好,能够很好的模拟混凝土双轴受压强度的提高和双轴拉压应力状态下的"拉压软化效应",这对混凝土结构的非线性分析是非常重要的.
文摘Postcolonial theory is a well-established critical approach that addresses issues such as the quest for identity, the significance of land, homelessness, resistance, and the encounter between the colonized and the colonizers. This paper examines the postcolonial elements utilized by the Anglo-Jordanian novelist Fadia Faqir in her novel Pillars of Salt. It discusses the novel＇s themes and techniques associated with postcolonialism as a literary theory and as a critical approach. Being a postcolonial text, the novel shows the writer＇s attempt at writing back in response to the colonial past with its power structures and social hierarchies. Thematically, the novel is analyzed with special reference to such topics as the subaltern, Anglo-Jordanian ties, language, othemess, and identity. The paper also traces the continuity of postcolonial discourse in Faqir＇s novel and gives a short survey of the historical events that provide the background to the main events in this essentially postcolonial work.
基金Supported by National Natlural Science Foundation of China
文摘A mistake in Proposition I-1.21.1 of 'A Compendium of Continuous Lattices'by G.Giers et al. is pointed out and a revised proposition with a proof is given.
基金supported by the National Natural Science Foundation of China(Nos.10861007,11161023)the National Excellent Doctoral Dissertation of China(No.2007B14)+1 种基金the Ganpo 555 Programme for Leading Talents of Jiangxi Province,the Natural Science Foundation of Jiangxi Province(No.20114BAB201008)the Fund of Education Department of Jiangxi Province(No.GJJ12657)
文摘The concepts of hypercontinuous posets and generalized completely continuous posets are introduced. It is proved that for a poset P the following three conditions are equivalent:(1) P is hypercontinuous;(2) the dual of P is generalized completely continuous;(3) the normal completion of P is a hypercontinuous lattice. In addition, the relational representation and the intrinsic characterization of hypercontinuous posets are obtained.
基金supports from the National Natural Science Foundation of China(Grant Nos. 10772093,10972121,and 10732050)the National Basic Research Program of China(Grant Nos. 2007CB936803 and 2010CB-631005)
文摘In this paper,a phenomenological continuum theory of surface piezoelectricity accounting for the linear superficial interplay between electricity and elasticity is formulated primarily for elastic dielectric materials.This theory is inspired by the physical idea that once completely relaxed,an insulating free dielectric surface will sustain a nontrivial spontaneous surface polarization in the normal direction together with a tangential self-equilibrated residual surface stress field.Under external loadings,the surface Helmholtz free energy density is identified as the characteristic function of such surfaces,with the in-plane strain tensor of surface and the surface free charge density as the independent state variables.New boundary conditions governing the surface piezoelectricity are derived through the variational method.The resulting concepts of charge-dependent surface stress and deformationdependent surface electric field reflect the linear electromechanical coupling behavior of nanodielectric surfaces.As an illustrative example,an infinite radially polarizable piezoelectric nanotube with both inner and outer surfaces grounded is investigated.The novel phenomenon of possible surface-induced polarity inversion is predicted for thin enough nanotubes.
文摘We study uncertainty and certainty relations for two successive measurements of two-dimensional observables. Uncertainties in successive measurement are considered within the following two scenarios. In the first scenario, the second measurement is performed on the quantum state generated affer the first measurement with completely erased information. In the second scenario, the second measurement is performed on the post-first- tioned on the actual measurement outcome. Induced entropies. For two successive projective t state condiquantum uncertainties are characterized by means of the Tsallis t of a qubit, we obtain minimal and maximal values of related entropic measures of induced uncertainties. Some conclusions found in the second scenario are extended to arbitrary finite dimensionality. In particular, a connection with mutual unbiasedness is emphasized.
基金supported by the National Natural Science Foundation of China under Grant Nos.11171050,11101262 and 11371164the National Natural Science Foundation for the Youth of China under Grant Nos.11301081,11401073
文摘This paper considers the fed-batch culture in microbial fermentation process, which consists of batch and continuous culture. The goal is to explore the properties of a novel model which can describe the characteristics of multistage for the population growth of microorganisms in nonlinear switch dynamic system. The improved model is developed based on the experimental data to describe the delayed, developmental and stationary stages well for the phases of batch culture. Then the existence, uniqueness and boundedness of solutions to the nonlinear multistage switch system and the Lipschitz continuity and differentiability of solutions with respect to the initial state is discussed as well. Finally, a numerical simulation is employed for the nonlinear multistage switch system.
