The role of viscosity coefficient(η′), coulomb coupling parameter(Γ) and dust mass on the growth of jeans mode is investigated in strongly coupled dusty plasma using equations of Generalized Hydrodynamics(GH) Model...The role of viscosity coefficient(η′), coulomb coupling parameter(Γ) and dust mass on the growth of jeans mode is investigated in strongly coupled dusty plasma using equations of Generalized Hydrodynamics(GH) Model. The novel aspect of this work is that the force arising due to electrostatic pressure caused by grain grain interaction has been included in the dynamics of dust particles. This force is found to play a significant role in counter balancing the self gravity effect, thereby reducing the growth rate of jeans instability. The present work may provide more physical insight in understanding the mechanisms behind formation of planetesimals, stars etc.展开更多
Protoplanetary disks are critical environments for studying the processes of planet formation,where dust grains evolve and coalesce to form planetary systems[1].Dust grains in these disks evolve over time,growing from...Protoplanetary disks are critical environments for studying the processes of planet formation,where dust grains evolve and coalesce to form planetary systems[1].Dust grains in these disks evolve over time,growing from(sub)micronsized particles to larger aggregates and eventually forming planetesimals,the building blocks of planets.展开更多
On the basis of geochemical and geophysical data, the present mantle possesses three-dimensional chemical heterogeneity. It is suggested that the evolution of geochemical heterogeneity (GCH) should be divided into thr...On the basis of geochemical and geophysical data, the present mantle possesses three-dimensional chemical heterogeneity. It is suggested that the evolution of geochemical heterogeneity (GCH) should be divided into three stages. The first stage is EGCH (～1.8Ga), the second stage can be regarded as the homogenizing or transform stage around 1.8Ga, and the third stage is later geochemical heterogeneity (LGCH). This note roughly summarizes EGCH of global lead isotopes composition, and suggests that the origin of EGCH stemmed from the primary/initial chemical heterogeneity (PCH) of planetesimals accumulating on the earth.展开更多
文摘The role of viscosity coefficient(η′), coulomb coupling parameter(Γ) and dust mass on the growth of jeans mode is investigated in strongly coupled dusty plasma using equations of Generalized Hydrodynamics(GH) Model. The novel aspect of this work is that the force arising due to electrostatic pressure caused by grain grain interaction has been included in the dynamics of dust particles. This force is found to play a significant role in counter balancing the self gravity effect, thereby reducing the growth rate of jeans instability. The present work may provide more physical insight in understanding the mechanisms behind formation of planetesimals, stars etc.
文摘Protoplanetary disks are critical environments for studying the processes of planet formation,where dust grains evolve and coalesce to form planetary systems[1].Dust grains in these disks evolve over time,growing from(sub)micronsized particles to larger aggregates and eventually forming planetesimals,the building blocks of planets.
文摘On the basis of geochemical and geophysical data, the present mantle possesses three-dimensional chemical heterogeneity. It is suggested that the evolution of geochemical heterogeneity (GCH) should be divided into three stages. The first stage is EGCH (～1.8Ga), the second stage can be regarded as the homogenizing or transform stage around 1.8Ga, and the third stage is later geochemical heterogeneity (LGCH). This note roughly summarizes EGCH of global lead isotopes composition, and suggests that the origin of EGCH stemmed from the primary/initial chemical heterogeneity (PCH) of planetesimals accumulating on the earth.
