The Jeans instability in collisional dusty plasmas has been analytically investigated by considering the polarization force effect. Instabilities due to dust-neutral and ion-neutral drags can occur in electrostatic wa...The Jeans instability in collisional dusty plasmas has been analytically investigated by considering the polarization force effect. Instabilities due to dust-neutral and ion-neutral drags can occur in electrostatic waves of collisional dusty plasmas with self-gravitating particles. In this study, the effect of gravitational force on heavy dust particles is considered in tandem with both the polarization and electrostatic forces. The theoretical framework has been developed and the dispersion relation and instability growth rate have been derived, assuming the plane wave approximation. The derived instability growth rate shows that, in collisional dusty plasmas, the Jeans instability strongly depends on the magnitude of the polarization force.展开更多
1 Introduction Throughout his life,Jean-Pierre Abel-Rémusat(1788-1832)(Fig.1)was in contact with the medical art,through his family,through his studies,through a few moments of practice,through his various intere...1 Introduction Throughout his life,Jean-Pierre Abel-Rémusat(1788-1832)(Fig.1)was in contact with the medical art,through his family,through his studies,through a few moments of practice,through his various interests and in many of his written.展开更多
The generalization of Jeans equation in expanding and rotating Universe is given. We found the generalized frequency of baryonic substrate oscillations in the rotating Universe. In doing this, two cases were considere...The generalization of Jeans equation in expanding and rotating Universe is given. We found the generalized frequency of baryonic substrate oscillations in the rotating Universe. In doing this, two cases were considered: the generalized wave vector coincides with the Jeans wave vector and second case, when the generalized wave vector tends to zero.展开更多
Based on the framework of Kaniadakis’statistics and its related kinetic theory,the Jeans instability for selfgravitational systems in the background of Eddington-inspired Born-Infield(EiBI)gravity is revisited.A disp...Based on the framework of Kaniadakis’statistics and its related kinetic theory,the Jeans instability for selfgravitational systems in the background of Eddington-inspired Born-Infield(EiBI)gravity is revisited.A dispersion relation generalizing the Jeans modes is derived by modifying the Maxwellian distribution to a family of power law distributions parameterized by the κ parameter.It is established that theκ-deformed Kaniadakis distribution has significant effects on the Jeans modes of the collisionless EiBI-gravitational systems.And as expected,in the limitation κ→0,the corresponding results for Maxwellian case are recovered.The related result in the present work is valuable for the investigations involving the fields of astrophysics such as neutron stars,accretion disks,and relevant plasma physics,etc.展开更多
The possibility of baryons cooled by a millicharged dark matter(mDM)via mDM–baryons scattering has recently been proposed to explain the observation discrepancy from the experiment to detect the global epoch of reion...The possibility of baryons cooled by a millicharged dark matter(mDM)via mDM–baryons scattering has recently been proposed to explain the observation discrepancy from the experiment to detect the global epoch of reionization signature(EDGES).In this sense,we analyze the Jeans instability of self-gravitational systems in the background of mDM under kinetic regime that the collisionless Boltzmann equation and Poisson equation have been combined to obtain the modified dispersion relation.It is shown that the effect of mDM is significant on the dynamics of gravitational collapse,i.e.,the presence of mDM makes the self-gravitational systems more difficult to collapse relatively.展开更多
This research presents an ultra-wideband (UWB) textile antenna designfor body-centric applications. The antenna is printed on a 1 mm thick denim substrate with a 1.7 relative permittivity. The jeans substrate is sand...This research presents an ultra-wideband (UWB) textile antenna designfor body-centric applications. The antenna is printed on a 1 mm thick denim substrate with a 1.7 relative permittivity. The jeans substrate is sandwiched between apartial ground plane and a radiating patch with a Q-shaped slot. The slotted radiating patch is placed above the substrate and measures 27.8 mm × 23.8 mm. In freespace, the antenna covers the ultra-wideband spectrum designated by the FederalCommunication Commission (FCC). Various parameters of the antenna designwere changed for further performance evaluation. Depending on the operating frequency, the antenna's realized gain varied from 2.7 to 5 dB. The antenna achievedhigh radiation efficiency with an omnidirectional radiation pattern. A parametricstudy was performed in research on varying antenna substrates and other components of the antenna. The three outermost layers of the human body are used tomodel a human phantom for on-body simulation. After that, the antenna wasplaced at five different distances from the phantom. The findings demonstrate thatat close distances to the phantom, the antenna's gain and efficiency at lower frequencies are reduced. The antenna's radiation efficiency and gain were muchhigher at higher frequencies for distances greater than 6 mm. Compared to freespace, the antenna's radiation pattern was more omnidirectional, especially athigher frequencies. This antenna is novel, compact and has an ultra wide bandwidth, a maximum of 94.60% radiation efficiency and a 5 dBi gain that will makeit a good candidate for body-centric communications.展开更多
第68界Pitti Immagine Uomo开幕之际，佛罗伦萨的Stazione Leopolda Spaces同时迎来了颇具魔幻色彩的展览。L＇Altro Jeans主题展不仅演绎了“牛仔文化”．构筑了“Jeans”的当代语境，同时再现了具有颠覆和创新精神的“牛仔革新者”Mar...第68界Pitti Immagine Uomo开幕之际，佛罗伦萨的Stazione Leopolda Spaces同时迎来了颇具魔幻色彩的展览。L＇Altro Jeans主题展不仅演绎了“牛仔文化”．构筑了“Jeans”的当代语境，同时再现了具有颠覆和创新精神的“牛仔革新者”Marithe和Francois Girbaud这对法国夫妇40年来的探索和追求——“II faut laver le jean de ses idees”（让牛仔呈现自身观念）。展开更多
The M’s Dream brand pure silk jeans are novel brand name garments developed by the M’s Dream Clothing and Accessories Design Institute. The pure silk jeans are processed from proteinase for the chemical treatment of...The M’s Dream brand pure silk jeans are novel brand name garments developed by the M’s Dream Clothing and Accessories Design Institute. The pure silk jeans are processed from proteinase for the chemical treatment of silk fabrics through mechanical friction. It combines the advantages of pure cotton jeans and pure silks with plump and thick silk surface, and is noted for its展开更多
久石让音乐的Minimal Music与New Age Music创作风格,广受大众喜爱,令人陶醉,扣人心弦。他的影视配乐,在推动剧情与突出角色人物性格方面独树一帜。在此,特对其个人做配乐经历梳理,对其音乐作品做创作特色、乐器选用、特效音响创编以及...久石让音乐的Minimal Music与New Age Music创作风格,广受大众喜爱,令人陶醉,扣人心弦。他的影视配乐,在推动剧情与突出角色人物性格方面独树一帜。在此,特对其个人做配乐经历梳理,对其音乐作品做创作特色、乐器选用、特效音响创编以及审美主题的深入分析,以探讨其在影视配乐上的借鉴价值,为后续音乐领域研学者与创作者提供丰富的思路。展开更多
文摘The Jeans instability in collisional dusty plasmas has been analytically investigated by considering the polarization force effect. Instabilities due to dust-neutral and ion-neutral drags can occur in electrostatic waves of collisional dusty plasmas with self-gravitating particles. In this study, the effect of gravitational force on heavy dust particles is considered in tandem with both the polarization and electrostatic forces. The theoretical framework has been developed and the dispersion relation and instability growth rate have been derived, assuming the plane wave approximation. The derived instability growth rate shows that, in collisional dusty plasmas, the Jeans instability strongly depends on the magnitude of the polarization force.
文摘1 Introduction Throughout his life,Jean-Pierre Abel-Rémusat(1788-1832)(Fig.1)was in contact with the medical art,through his family,through his studies,through a few moments of practice,through his various interests and in many of his written.
文摘The generalization of Jeans equation in expanding and rotating Universe is given. We found the generalized frequency of baryonic substrate oscillations in the rotating Universe. In doing this, two cases were considered: the generalized wave vector coincides with the Jeans wave vector and second case, when the generalized wave vector tends to zero.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11763006 and 11863004)the Fund from the Jiangxi Provincial Key Laboratory of Fusion and Information Control(Grant No.20171BCD40005).
文摘Based on the framework of Kaniadakis’statistics and its related kinetic theory,the Jeans instability for selfgravitational systems in the background of Eddington-inspired Born-Infield(EiBI)gravity is revisited.A dispersion relation generalizing the Jeans modes is derived by modifying the Maxwellian distribution to a family of power law distributions parameterized by the κ parameter.It is established that theκ-deformed Kaniadakis distribution has significant effects on the Jeans modes of the collisionless EiBI-gravitational systems.And as expected,in the limitation κ→0,the corresponding results for Maxwellian case are recovered.The related result in the present work is valuable for the investigations involving the fields of astrophysics such as neutron stars,accretion disks,and relevant plasma physics,etc.
基金the National Natural Science Foundation of China(Grant Nos.11763006 and 11863004)the fund from the Jiangxi Provincial Key Laboratory of Fusion and Information Control(Grant No.20171BCD40005)the Project of Scientific and Technological Innovation Base of Jiangxi Province,China(Grant No.20203CCD46008)。
文摘The possibility of baryons cooled by a millicharged dark matter(mDM)via mDM–baryons scattering has recently been proposed to explain the observation discrepancy from the experiment to detect the global epoch of reionization signature(EDGES).In this sense,we analyze the Jeans instability of self-gravitational systems in the background of mDM under kinetic regime that the collisionless Boltzmann equation and Poisson equation have been combined to obtain the modified dispersion relation.It is shown that the effect of mDM is significant on the dynamics of gravitational collapse,i.e.,the presence of mDM makes the self-gravitational systems more difficult to collapse relatively.
基金support from Taif University Researchers Supporting Project(TURSP-2020/214),Taif University,Taif,Saudi Arabia.
文摘This research presents an ultra-wideband (UWB) textile antenna designfor body-centric applications. The antenna is printed on a 1 mm thick denim substrate with a 1.7 relative permittivity. The jeans substrate is sandwiched between apartial ground plane and a radiating patch with a Q-shaped slot. The slotted radiating patch is placed above the substrate and measures 27.8 mm × 23.8 mm. In freespace, the antenna covers the ultra-wideband spectrum designated by the FederalCommunication Commission (FCC). Various parameters of the antenna designwere changed for further performance evaluation. Depending on the operating frequency, the antenna's realized gain varied from 2.7 to 5 dB. The antenna achievedhigh radiation efficiency with an omnidirectional radiation pattern. A parametricstudy was performed in research on varying antenna substrates and other components of the antenna. The three outermost layers of the human body are used tomodel a human phantom for on-body simulation. After that, the antenna wasplaced at five different distances from the phantom. The findings demonstrate thatat close distances to the phantom, the antenna's gain and efficiency at lower frequencies are reduced. The antenna's radiation efficiency and gain were muchhigher at higher frequencies for distances greater than 6 mm. Compared to freespace, the antenna's radiation pattern was more omnidirectional, especially athigher frequencies. This antenna is novel, compact and has an ultra wide bandwidth, a maximum of 94.60% radiation efficiency and a 5 dBi gain that will makeit a good candidate for body-centric communications.
文摘第68界Pitti Immagine Uomo开幕之际，佛罗伦萨的Stazione Leopolda Spaces同时迎来了颇具魔幻色彩的展览。L＇Altro Jeans主题展不仅演绎了“牛仔文化”．构筑了“Jeans”的当代语境，同时再现了具有颠覆和创新精神的“牛仔革新者”Marithe和Francois Girbaud这对法国夫妇40年来的探索和追求——“II faut laver le jean de ses idees”（让牛仔呈现自身观念）。
文摘The M’s Dream brand pure silk jeans are novel brand name garments developed by the M’s Dream Clothing and Accessories Design Institute. The pure silk jeans are processed from proteinase for the chemical treatment of silk fabrics through mechanical friction. It combines the advantages of pure cotton jeans and pure silks with plump and thick silk surface, and is noted for its
文摘久石让音乐的Minimal Music与New Age Music创作风格,广受大众喜爱,令人陶醉,扣人心弦。他的影视配乐,在推动剧情与突出角色人物性格方面独树一帜。在此,特对其个人做配乐经历梳理,对其音乐作品做创作特色、乐器选用、特效音响创编以及审美主题的深入分析,以探讨其在影视配乐上的借鉴价值,为后续音乐领域研学者与创作者提供丰富的思路。
