Amid overlapping crises and uncertainties as the world enters an era of turbulence and transformation,the countries of the Global South are swiftly emerging from the periphery of world politics to the forefront of int...Amid overlapping crises and uncertainties as the world enters an era of turbulence and transformation,the countries of the Global South are swiftly emerging from the periphery of world politics to the forefront of international cooperation,playing an increasingly vital role in advancing humanity’s collective progress.展开更多
As the accelerated changes on a scale unprecedented in a century are unfolding across the world,multipolarity of the international system is increasingly accepted as a fundamental trend.As a unique international actor...As the accelerated changes on a scale unprecedented in a century are unfolding across the world,multipolarity of the international system is increasingly accepted as a fundamental trend.As a unique international actor,the European Union,despite its initial strategic anxiety about multipolarity,has gradually come to terms with the growing reality of multipolarity and adjusted its foreign strategy to become one of the poles in the multipolar world.展开更多
Nanofluids or liquids with suspended nanoparticles are likely to be the future heat transfer media, as they exhibit higher thermal conductivity than those of liquids. It has been proposed that nanoparticles are apt to...Nanofluids or liquids with suspended nanoparticles are likely to be the future heat transfer media, as they exhibit higher thermal conductivity than those of liquids. It has been proposed that nanoparticles are apt to congregate and form clusters, and hence the interaction between nanoparticles becomes important. In this paper, by taking into account the interaction between nearest-neighbour inclusions, we adopt the multiple image method to investigate the effective thermal conductivity of nanofluids. Numerical results show that then the thermal conductivity ratio between the nanoparticles and fluids is large, and the two nanoparticles are close up and even touch, and the polnt-dipole theory such as Maxwell-Garnett theory becomes rough as many-body interactions are neglected. Our theoretical results on the effective thermal conductivity of CuO/water and Al2O3/water nanofluids are in good agreement with experimental data.展开更多
A sputtering-type microwave multipolar ECR plasma processing for preparing thin films, is built with Nd-Fe-B magnets and 2.45 GHz, TE<sub>10</sub> mode microwave. The plasma distributions in the axial dire...A sputtering-type microwave multipolar ECR plasma processing for preparing thin films, is built with Nd-Fe-B magnets and 2.45 GHz, TE<sub>10</sub> mode microwave. The plasma distributions in the axial direction, which is important for preparing thin films, are found to be very sensitive to the magnetic potential fields in plasma chamber. The plasma parameters are also influenced by the background gas pressure.展开更多
Research of the acoustic local effect of metamaterial is widely used in the fields of environmental science,military industry and biomedicine.In this paper,the metamaterial is designed by annular columnar structures.T...Research of the acoustic local effect of metamaterial is widely used in the fields of environmental science,military industry and biomedicine.In this paper,the metamaterial is designed by annular columnar structures.The acoustic local effect in slender columnar structure with two layers of rings in air is investigated.Results prove that when the plane acoustic wave is incident into the model,complex interference and diffraction occur.And at different frequencies,multipolar acoustic local effect existes and cycle distribution phenomenon is observed.It is noteworthy that this phenomenon has very weak relatedness with the materials and acoustic parameters of the model.The research of this metamaterial design in this paper has definite reference significance in the acoustic communication and amplification of the acoustic signal detection.展开更多
The multipolar velocity field structures are investigated by 2D momentum conservation equation with 3D equilibrium sheared flows in the full toroidal system. Numerical results show that the non-existence of radial vel...The multipolar velocity field structures are investigated by 2D momentum conservation equation with 3D equilibrium sheared flows in the full toroidal system. Numerical results show that the non-existence of radial velocity field in equilibrium surfaces is suitable only for the zero-order term of our 2D simulation. The non-zero-order radial velocity field is still preserved, even when converted to conventional magnetic surface coordinates. The distribution of velocity field vectors of the order of 1, 2, and 3 are presented respectively in 2, 4, and 6 polar fields with the local vortex structure. The excitation mechanisms of these velocity vortices are the coupling effects of the magneto-fluid structure patterns and the toroidal effects. These results can help us understand the complexity of core physics, the transverse transport across magnetic field by the radial plasma flow and the formation of velocity vortices.展开更多
The multipolar magnetic field structure is investigated by the momentum conservation equation with self-c on sistent 3D sheared flows during transition of plasma properties from local paramagnetic to diamagnelic field...The multipolar magnetic field structure is investigated by the momentum conservation equation with self-c on sistent 3D sheared flows during transition of plasma properties from local paramagnetic to diamagnelic fields.Numerical results show that the traditional poloidal magnetic field(Bp)is one part of equilibrium magnetic fields.The non-zero-order quantities are originaled from the higher-order terms of 2D equilibrium treatment based on a Fourier expansion of 0(r,0).The distributions of magnetic field vectors of the order of 1,2,and 3 terms are presented respectively in two.four,and six polar fields with the local vortex structures(spontaneous magnetic conn ection).The excitation mechanisms of the magnetic vortices are the coupling effects of the magnetic fluid structure pattern and the toroidal effects.These results can help us understand the physical mechanism of the in teraction between the external perturbation fields and control tearing modes,as well as the radial plasma flow and magnetic vortices.展开更多
A new method for plasma boundary reconstruction, based on the toroidal multipolar expansion （TME） scheme, is applied successfully in EAST. TME applies a limited number of toroidal multipolar moments based on toroida...A new method for plasma boundary reconstruction, based on the toroidal multipolar expansion （TME） scheme, is applied successfully in EAST. TME applies a limited number of toroidal multipolar moments based on toroidal coordinates to treat a two-dimensional problem of axisymmetric plasma equilibrium. The plasma boundary reconstructed by TME is consistent with the results by using EFIT. The method is sufficiently reliable and fast for real time shape control.展开更多
The pursuit of a systematic frequency uncertainty beyond 10^(-18) clock has triggered a multitude of investigations on the multipolar and higher-order lattice light shifts.The Cd atom has been proposed as a new candid...The pursuit of a systematic frequency uncertainty beyond 10^(-18) clock has triggered a multitude of investigations on the multipolar and higher-order lattice light shifts.The Cd atom has been proposed as a new candidate for the development of a lattice clock because of its smaller blackbody radiation shift at room temperature.Here,we apply an improved combined method of the Dirac-Fock plus core polarization and relativistic configuration interaction methods to calculate the dynamic multipolar polarizabilities of the Cd clock states.The effects of the high-order core-polarization potentials on the energies,reduced matrix elements,and multipolar polarizabilities have been evaluated systematically.The detailed comparison with available literature demonstrates that taking into account of the high-order core-polarization potentials is a simple and effective approach to improve the results of atomic properties for heavy atoms.展开更多
Purpose: Pulmonary vein isolation (PVI) is the accepted primary endpoint for catheter ablation of atrial fibrillation (AF). The aim of this study was to evaluate the level of PVI by PVAC, a multipolar circular cathete...Purpose: Pulmonary vein isolation (PVI) is the accepted primary endpoint for catheter ablation of atrial fibrillation (AF). The aim of this study was to evaluate the level of PVI by PVAC, a multipolar circular catheter utilizing bipolar/unipolar radiofrequency (RF) energy. Methods: Twenty patients with paroxysmal AF underwent PVAC ablation. PVI was validated by voltage reduction and pacing tests. Before and after RF ablation, left atrium (LA) and PV electroanatomic mapping (EAM) were performed by EnSite NavX system. Voltage abatement was considered for potentials 24mm: 9/20 (45%) vs 11/57 (19%),展开更多
The words that Xi Jinping said at the 47th World Economic Forum(WEF)have really surprised just the most inattentive people.During his visit to Davos,where leaders,entrepreneurs
Spatiotemporal optical vortices(STOVs)exhibit characteristics of transverse orbital angular momentum(OAM)that is perpendicular to the direction of pulse propagation,indicating significant potential for diverse applica...Spatiotemporal optical vortices(STOVs)exhibit characteristics of transverse orbital angular momentum(OAM)that is perpendicular to the direction of pulse propagation,indicating significant potential for diverse applications.In this study,we employ vanadium dioxide and photonic crystal plates to design tunable transreflective dual-channel terahertz(THz)spatiotemporal vortex generation devices that possess multipolarization adaptability.In the reflection channel,we achieve active tunability of the topological dark lines by utilizing circularly polarized light,based on the topological dark phenomenon,and observe variations in the number of singularities across the parameter space from different observational perspectives.In the transmission channel,we generate independent vortex singularities using linearly polarized light.This multifunctional terahertz device offers a novel approach for the generation and active tuning of spatiotemporal vortices.展开更多
At present,changes of great consequence for our world are unfolding in unprecedented ways.These changes present both strategic opportunities and serious challenges.Confronting the critical global issues facing the wor...At present,changes of great consequence for our world are unfolding in unprecedented ways.These changes present both strategic opportunities and serious challenges.Confronting the critical global issues facing the world today,such as the deficits in peace,development,security,and governance.展开更多
As the U.S.continues its proxy war with Russia in Ukraine and its escalation with China in the Asia-Pacific,the U.S.is also targeting a number of nationsnot only across Eurasia,but also far beyondit,including the Lati...As the U.S.continues its proxy war with Russia in Ukraine and its escalation with China in the Asia-Pacific,the U.S.is also targeting a number of nationsnot only across Eurasia,but also far beyondit,including the Latin American nation of Venezuela.展开更多
Paclitaxel is a widely used microtubule drug and cancer medicine.Here we report that by short exposure to paclitaxel at a low dose,multipolar spindles were induced in mitotic cells without centrosome amplification.Bot...Paclitaxel is a widely used microtubule drug and cancer medicine.Here we report that by short exposure to paclitaxel at a low dose,multipolar spindles were induced in mitotic cells without centrosome amplification.Both TPX2 depletion and Aurora-A overexpression antagonized the multipolarity.Live cell imaging showed that some paclitaxel-treated cells accomplished multipolar cell division and a portion of the daughter cells went on to the next round of mitosis.The surviving cells grew into clones with varied genome content.The results indicated that an aneuploidy population could be induced by short exposure to paclitaxel at a low dose,implicating potential side effects of paclitaxel.展开更多
In the last few years, ＂the BRICS＂ or Brazil, Russia, India, China, and South Africa have been increasingly investing in developing their cooperation and seeking to exert joint global influence. BRICS＇ mobilization...In the last few years, ＂the BRICS＂ or Brazil, Russia, India, China, and South Africa have been increasingly investing in developing their cooperation and seeking to exert joint global influence. BRICS＇ mobilization has been visible in the cooperation of high-level officials, deeper policy coordination, and the creation of BRICS institutions. As the BRICS intensify their pursuit of multipolarity, surprisingly little attention has been paid to the ways in which the BRICS has been received in the United States （US）, which is a crucial stakeholder in creating a multipolar system. How is the BRICS represented in US foreign policy circles？ This article examines the state of the US debate on the BR/CS, drawing on the per- spectives from foreign policy officials, top think tanks, and academics. It argues that there is a considerable gap between BRICS＇ multipolar aspirations and the perceptions of the grouping＇s promise and potential in the US. The BRICS is often marginalized in the US as an entity, and---even if accepted as such--it is considered ineffective in terms of its results. However, the BRICS benefits US foreign policy development： it challenges US officials to clarify their message on multipolarity; it reframes the debate from bilateral China vs. US competition to multilateral processes of providing global public goods; it generates a subfield of BRICS studies, which internationalize the production and consumption of knowledge in the field of global politics.展开更多
1 Introduction Zinc oxide (ZnO) thin films with c-axis orientation exhibit strong piezoelectric and piezooptic effects, and have often been used in acousto-electric and acousto-optic devices. In the bulk acoustic wave...1 Introduction Zinc oxide (ZnO) thin films with c-axis orientation exhibit strong piezoelectric and piezooptic effects, and have often been used in acousto-electric and acousto-optic devices. In the bulk acoustic wave (BAW) area, ZnO films have been used for acoustic microscopy and thin film resonators. In the surface acoustic wave (SAW) area, the ZnO films show the importance as a transducer and interactive material for programmable filters, convolvers, amplifiers, imagers, and resonators. In the guided optical wave (GOW) area the ZnO films have been applied to acousto-optic and electro-optic interactions and展开更多
文摘Amid overlapping crises and uncertainties as the world enters an era of turbulence and transformation,the countries of the Global South are swiftly emerging from the periphery of world politics to the forefront of international cooperation,playing an increasingly vital role in advancing humanity’s collective progress.
文摘As the accelerated changes on a scale unprecedented in a century are unfolding across the world,multipolarity of the international system is increasingly accepted as a fundamental trend.As a unique international actor,the European Union,despite its initial strategic anxiety about multipolarity,has gradually come to terms with the growing reality of multipolarity and adjusted its foreign strategy to become one of the poles in the multipolar world.
基金Project supported by the National Natural Science Foundation of China （Grant No 10204017） and the Natural Science of Jiangsu Province, China （Grant No BK2002038）.
文摘Nanofluids or liquids with suspended nanoparticles are likely to be the future heat transfer media, as they exhibit higher thermal conductivity than those of liquids. It has been proposed that nanoparticles are apt to congregate and form clusters, and hence the interaction between nanoparticles becomes important. In this paper, by taking into account the interaction between nearest-neighbour inclusions, we adopt the multiple image method to investigate the effective thermal conductivity of nanofluids. Numerical results show that then the thermal conductivity ratio between the nanoparticles and fluids is large, and the two nanoparticles are close up and even touch, and the polnt-dipole theory such as Maxwell-Garnett theory becomes rough as many-body interactions are neglected. Our theoretical results on the effective thermal conductivity of CuO/water and Al2O3/water nanofluids are in good agreement with experimental data.
文摘A sputtering-type microwave multipolar ECR plasma processing for preparing thin films, is built with Nd-Fe-B magnets and 2.45 GHz, TE<sub>10</sub> mode microwave. The plasma distributions in the axial direction, which is important for preparing thin films, are found to be very sensitive to the magnetic potential fields in plasma chamber. The plasma parameters are also influenced by the background gas pressure.
基金National Natural Science Foundation of China(No.61671414)Natural Science Foundation for Young Scientists of Shanxi Province,China(No.201601D202035)
文摘Research of the acoustic local effect of metamaterial is widely used in the fields of environmental science,military industry and biomedicine.In this paper,the metamaterial is designed by annular columnar structures.The acoustic local effect in slender columnar structure with two layers of rings in air is investigated.Results prove that when the plane acoustic wave is incident into the model,complex interference and diffraction occur.And at different frequencies,multipolar acoustic local effect existes and cycle distribution phenomenon is observed.It is noteworthy that this phenomenon has very weak relatedness with the materials and acoustic parameters of the model.The research of this metamaterial design in this paper has definite reference significance in the acoustic communication and amplification of the acoustic signal detection.
基金Supported by National Natural Science Foundation of China under Grant No.11575066Domestic ITER under Grant No.2009GB105003
文摘The multipolar velocity field structures are investigated by 2D momentum conservation equation with 3D equilibrium sheared flows in the full toroidal system. Numerical results show that the non-existence of radial velocity field in equilibrium surfaces is suitable only for the zero-order term of our 2D simulation. The non-zero-order radial velocity field is still preserved, even when converted to conventional magnetic surface coordinates. The distribution of velocity field vectors of the order of 1, 2, and 3 are presented respectively in 2, 4, and 6 polar fields with the local vortex structure. The excitation mechanisms of these velocity vortices are the coupling effects of the magneto-fluid structure patterns and the toroidal effects. These results can help us understand the complexity of core physics, the transverse transport across magnetic field by the radial plasma flow and the formation of velocity vortices.
文摘The multipolar magnetic field structure is investigated by the momentum conservation equation with self-c on sistent 3D sheared flows during transition of plasma properties from local paramagnetic to diamagnelic fields.Numerical results show that the traditional poloidal magnetic field(Bp)is one part of equilibrium magnetic fields.The non-zero-order quantities are originaled from the higher-order terms of 2D equilibrium treatment based on a Fourier expansion of 0(r,0).The distributions of magnetic field vectors of the order of 1,2,and 3 terms are presented respectively in two.four,and six polar fields with the local vortex structures(spontaneous magnetic conn ection).The excitation mechanisms of the magnetic vortices are the coupling effects of the magnetic fluid structure pattern and the toroidal effects.These results can help us understand the physical mechanism of the in teraction between the external perturbation fields and control tearing modes,as well as the radial plasma flow and magnetic vortices.
基金supported by the Major State Basic Research Development Program of China （973 program, No. 2009GB103000）, National Natural Science Foundation of China （No. 10835009）, and the Chinese Academy of Sciences with grant ID of KJCX3.SYW.N4
文摘A new method for plasma boundary reconstruction, based on the toroidal multipolar expansion （TME） scheme, is applied successfully in EAST. TME applies a limited number of toroidal multipolar moments based on toroidal coordinates to treat a two-dimensional problem of axisymmetric plasma equilibrium. The plasma boundary reconstructed by TME is consistent with the results by using EFIT. The method is sufficiently reliable and fast for real time shape control.
基金Project supported by the National Key Research and Development Program of China(Grant No.2017YFA0304402)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grants No.XDB21030300)the Hubei Province Science Fund for Distinguished Young Scholars,China(Grant No.2019CFA058).
文摘The pursuit of a systematic frequency uncertainty beyond 10^(-18) clock has triggered a multitude of investigations on the multipolar and higher-order lattice light shifts.The Cd atom has been proposed as a new candidate for the development of a lattice clock because of its smaller blackbody radiation shift at room temperature.Here,we apply an improved combined method of the Dirac-Fock plus core polarization and relativistic configuration interaction methods to calculate the dynamic multipolar polarizabilities of the Cd clock states.The effects of the high-order core-polarization potentials on the energies,reduced matrix elements,and multipolar polarizabilities have been evaluated systematically.The detailed comparison with available literature demonstrates that taking into account of the high-order core-polarization potentials is a simple and effective approach to improve the results of atomic properties for heavy atoms.
文摘Purpose: Pulmonary vein isolation (PVI) is the accepted primary endpoint for catheter ablation of atrial fibrillation (AF). The aim of this study was to evaluate the level of PVI by PVAC, a multipolar circular catheter utilizing bipolar/unipolar radiofrequency (RF) energy. Methods: Twenty patients with paroxysmal AF underwent PVAC ablation. PVI was validated by voltage reduction and pacing tests. Before and after RF ablation, left atrium (LA) and PV electroanatomic mapping (EAM) were performed by EnSite NavX system. Voltage abatement was considered for potentials 24mm: 9/20 (45%) vs 11/57 (19%),
文摘The words that Xi Jinping said at the 47th World Economic Forum(WEF)have really surprised just the most inattentive people.During his visit to Davos,where leaders,entrepreneurs
基金National Natural Science Foundation of China(62375158,62105187)Natural Science Foundation of Shandong Province(ZR2021QF010,ZR2020MF107)Development Plan of Youth Innovation Team in Colleges and Universities of Shandong Province(2022KJ216)。
文摘Spatiotemporal optical vortices(STOVs)exhibit characteristics of transverse orbital angular momentum(OAM)that is perpendicular to the direction of pulse propagation,indicating significant potential for diverse applications.In this study,we employ vanadium dioxide and photonic crystal plates to design tunable transreflective dual-channel terahertz(THz)spatiotemporal vortex generation devices that possess multipolarization adaptability.In the reflection channel,we achieve active tunability of the topological dark lines by utilizing circularly polarized light,based on the topological dark phenomenon,and observe variations in the number of singularities across the parameter space from different observational perspectives.In the transmission channel,we generate independent vortex singularities using linearly polarized light.This multifunctional terahertz device offers a novel approach for the generation and active tuning of spatiotemporal vortices.
文摘At present,changes of great consequence for our world are unfolding in unprecedented ways.These changes present both strategic opportunities and serious challenges.Confronting the critical global issues facing the world today,such as the deficits in peace,development,security,and governance.
文摘As the U.S.continues its proxy war with Russia in Ukraine and its escalation with China in the Asia-Pacific,the U.S.is also targeting a number of nationsnot only across Eurasia,but also far beyondit,including the Latin American nation of Venezuela.
基金supported by the National Natural Science Foundation of China(Grant Nos.31071188,31030044,30721064,30900726 and 90913021)the National Key Basic Research and Development Program of China(Grant Nos.2010CB833705,2006CB910101 and 2007CB914502)
文摘Paclitaxel is a widely used microtubule drug and cancer medicine.Here we report that by short exposure to paclitaxel at a low dose,multipolar spindles were induced in mitotic cells without centrosome amplification.Both TPX2 depletion and Aurora-A overexpression antagonized the multipolarity.Live cell imaging showed that some paclitaxel-treated cells accomplished multipolar cell division and a portion of the daughter cells went on to the next round of mitosis.The surviving cells grew into clones with varied genome content.The results indicated that an aneuploidy population could be induced by short exposure to paclitaxel at a low dose,implicating potential side effects of paclitaxel.
文摘In the last few years, ＂the BRICS＂ or Brazil, Russia, India, China, and South Africa have been increasingly investing in developing their cooperation and seeking to exert joint global influence. BRICS＇ mobilization has been visible in the cooperation of high-level officials, deeper policy coordination, and the creation of BRICS institutions. As the BRICS intensify their pursuit of multipolarity, surprisingly little attention has been paid to the ways in which the BRICS has been received in the United States （US）, which is a crucial stakeholder in creating a multipolar system. How is the BRICS represented in US foreign policy circles？ This article examines the state of the US debate on the BR/CS, drawing on the per- spectives from foreign policy officials, top think tanks, and academics. It argues that there is a considerable gap between BRICS＇ multipolar aspirations and the perceptions of the grouping＇s promise and potential in the US. The BRICS is often marginalized in the US as an entity, and---even if accepted as such--it is considered ineffective in terms of its results. However, the BRICS benefits US foreign policy development： it challenges US officials to clarify their message on multipolarity; it reframes the debate from bilateral China vs. US competition to multilateral processes of providing global public goods; it generates a subfield of BRICS studies, which internationalize the production and consumption of knowledge in the field of global politics.
文摘1 Introduction Zinc oxide (ZnO) thin films with c-axis orientation exhibit strong piezoelectric and piezooptic effects, and have often been used in acousto-electric and acousto-optic devices. In the bulk acoustic wave (BAW) area, ZnO films have been used for acoustic microscopy and thin film resonators. In the surface acoustic wave (SAW) area, the ZnO films show the importance as a transducer and interactive material for programmable filters, convolvers, amplifiers, imagers, and resonators. In the guided optical wave (GOW) area the ZnO films have been applied to acousto-optic and electro-optic interactions and
