A test study on 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has been carried out in a specially designed discharge cabinet. A mechanical sieve is set up for sifting differen...A test study on 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has been carried out in a specially designed discharge cabinet. A mechanical sieve is set up for sifting different solid particles into the discharge space uniformly. The lightning impulse voltage according with international electro-technical commission （IEC） standard is applied to the electrodes inside the discharge cabinet by the rule of up-down method in a total of 40 times. The results showed that the 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has its own features and is much different from that in air.展开更多
A line-to-plate reactor was set-up in the experimental study on the application of nanosecond pulsed corona discharge plasma technology in environmental pollution control. Investigation on the attenuation and distorti...A line-to-plate reactor was set-up in the experimental study on the application of nanosecond pulsed corona discharge plasma technology in environmental pollution control. Investigation on the attenuation and distortion of the amplitude of the pulse wave front and the discharge image as well as the waveform along the corona wire was conducted. The results show that the wave front decreases sharply during the corona discharge along the corona wire. The higher the amplitude of the applied pulse is, the more the amplitude of the wave front decreased. The wave attenuation responds in a lower corona discharge inversely. To get a higher efficiency of the line-to-plate reactor a sharp attenuation of the corona has to be considered in practical design.展开更多
The transversal relaxation time, the effective transversal relaxation time and the water self-diffusion coefficient are evaluated during hemoglobin S polymerization. One homogeneous permanent magnet and one inhomogene...The transversal relaxation time, the effective transversal relaxation time and the water self-diffusion coefficient are evaluated during hemoglobin S polymerization. One homogeneous permanent magnet and one inhomogeneous and portable unilateral magnet with a very strong and constant static magnetic field gradient were utilized. The Carr-Purcell-Meiboom-Gill method was used before and after placing the studied samples 24 hours at 36°C to guarantee the polymerization. The transversal relaxation shows two exponents after polymerization supporting the concept of partially polymerized hemoglobin. The effective transversal relaxation time decreases around 40%, which can be explained by the increase of water self-diffusion coefficient 1.8 times as a main value. This result can be explained considering the effects of the agglutination process on the obstruction and hydration effects in a partially polymerized solution.展开更多
In pursuit of higher energy density,lower cost,longer lifespan and safety,remarkable research efforts have been taken to innovate various types of energy storage materials/devices,especially metal-ion batteries such a...In pursuit of higher energy density,lower cost,longer lifespan and safety,remarkable research efforts have been taken to innovate various types of energy storage materials/devices,especially metal-ion batteries such as Li-ion batteries(LIBs).One of the major challenges is to elucidate the working mechanisms and/or the controlling factors of any new material in a full battery,which requires adequate characterization/diagnosis techniques.Among the numerous electrochemical ex-situ and insitu characterization techniques,magnetic resonance techniques,including nuclear magnetic resonance(NMR),magnetic resonance imaging(MRI)and electron paramagnetic resonance(EPR),are unique in terms of providing structural information at the atomic level and real-time phase and morphology evolution and characterizing ionic motion at various timescales.This special issue is dedicated to an editorial and a selection of papers on the theme of investigating energy storage materials/devices using magnetic resonance techniques.As the vip editors of this special issue,we are honored to introduce the following high-quality research articles and review articles.展开更多
Recent experimental advances have uncovered fractional Chern insulator(FCI)states in twisted MoTe_(2)(tMoTe_(2))systems under zero magnetic field.Understanding the interaction effects on topological phases within real...Recent experimental advances have uncovered fractional Chern insulator(FCI)states in twisted MoTe_(2)(tMoTe_(2))systems under zero magnetic field.Understanding the interaction effects on topological phases within realistic model presents a significant theoretical challenge.Here,we construct a moirésuperlattice model tailored for tMoTe_(2)and conduct investigations using state-of-the-art tensor-network methods.Our ground-state calculations reveal a rich variety of interaction-driven and filling-dependent topological phases,including FCIs,Chern insulators,and generalized Wigner crystals,which are revealed in recent experiments.For FCI state,dynamical simulations uncover a single-particle excitation continuum with a finite charge gap,reflecting the fractionalized charge excitations.Finite-temperature calculations further determine characteristic charge activation and ferromagnetic transition temperatures,reconciling existing experimental discrepancies.Furthermore,using this realistic lattice model,we predict the presence of quantum anomalous Hall crystals exhibiting integer Hall conductivity at fractional fillings in tMoTe_(2).By integrating ground-state,finite-temperature,and dynamical analyses,our work establishes a comprehensive framework for understanding correlated topological phases in tMoTe_(2)and related moirésystems.展开更多
High quality chromium （Cr） doped three-dimensional topological insulator （TI） Sb2Te3 films are grown via molecular beam epitaxy on heat-treated insulating SrTiO3 （111） substrates. We report that the Dirac surfac...High quality chromium （Cr） doped three-dimensional topological insulator （TI） Sb2Te3 films are grown via molecular beam epitaxy on heat-treated insulating SrTiO3 （111） substrates. We report that the Dirac surface states are insensitive to Cr doping, and a perfect robust long-range ferromagnetic order is unveiled in epitaxial Sb2 xCrxTe3 films. The anomalous Hall effect is modulated by applying a bottom gate, contrary to the ferromagnetism in conventional diluted magnetic semiconductors （DMSs）, here the coercivity field is not significantly changed with decreasing cartier density. Carrier-independent ferromag- netism heralds Sbz_xCrxTe3 films as the base candidate TI material to realize the quantum anomalous Hall （QAH） effect. These results also indicate the potential of controlling anomalous Hall voltage in future TI-based magneto-electronics and spintronics.展开更多
The design optimization and analysis of charged particle beam systems employing intense beams requires a robust and accurate Poisson solver.This paper presents a new type of Poisson solver which allows the effects of ...The design optimization and analysis of charged particle beam systems employing intense beams requires a robust and accurate Poisson solver.This paper presents a new type of Poisson solver which allows the effects of space charge to be elegantly included into the system dynamics.This is done by casting the charge distribution function into a series of basis functions,which are then integrated with an appropriate Green’s function to find a Taylor series of the potential at a given point within the desired distribution region.In order to avoid singularities,a Duffy transformation is applied,which allows singularity-free integration and maximized convergence region when performed with the help of Differential Algebraic methods.The method is shown to perform well on the examples studied.Practical implementation choices and some of their limitations are also explored.展开更多
The nano-crystalline materials with many special and super magnetic properties could be synthesized by fractional crystallization of amorphous alloys. Since this new method for preparation of nano-crystalline material...The nano-crystalline materials with many special and super magnetic properties could be synthesized by fractional crystallization of amorphous alloys. Since this new method for preparation of nano-crystalline materials was introduced, the crystallization kinetics of amorphous alloys has been studied in more and more intensive investigations. So far, almost all experiments on the crystallization kinetics are conducted by differential展开更多
基金National Natural Science Foundation of China.(No.50237010)
文摘A test study on 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has been carried out in a specially designed discharge cabinet. A mechanical sieve is set up for sifting different solid particles into the discharge space uniformly. The lightning impulse voltage according with international electro-technical commission （IEC） standard is applied to the electrodes inside the discharge cabinet by the rule of up-down method in a total of 40 times. The results showed that the 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has its own features and is much different from that in air.
基金National Natural Science Foundation of China (No.50237010)
文摘A line-to-plate reactor was set-up in the experimental study on the application of nanosecond pulsed corona discharge plasma technology in environmental pollution control. Investigation on the attenuation and distortion of the amplitude of the pulse wave front and the discharge image as well as the waveform along the corona wire was conducted. The results show that the wave front decreases sharply during the corona discharge along the corona wire. The higher the amplitude of the applied pulse is, the more the amplitude of the wave front decreased. The wave attenuation responds in a lower corona discharge inversely. To get a higher efficiency of the line-to-plate reactor a sharp attenuation of the corona has to be considered in practical design.
文摘The transversal relaxation time, the effective transversal relaxation time and the water self-diffusion coefficient are evaluated during hemoglobin S polymerization. One homogeneous permanent magnet and one inhomogeneous and portable unilateral magnet with a very strong and constant static magnetic field gradient were utilized. The Carr-Purcell-Meiboom-Gill method was used before and after placing the studied samples 24 hours at 36°C to guarantee the polymerization. The transversal relaxation shows two exponents after polymerization supporting the concept of partially polymerized hemoglobin. The effective transversal relaxation time decreases around 40%, which can be explained by the increase of water self-diffusion coefficient 1.8 times as a main value. This result can be explained considering the effects of the agglutination process on the obstruction and hydration effects in a partially polymerized solution.
文摘In pursuit of higher energy density,lower cost,longer lifespan and safety,remarkable research efforts have been taken to innovate various types of energy storage materials/devices,especially metal-ion batteries such as Li-ion batteries(LIBs).One of the major challenges is to elucidate the working mechanisms and/or the controlling factors of any new material in a full battery,which requires adequate characterization/diagnosis techniques.Among the numerous electrochemical ex-situ and insitu characterization techniques,magnetic resonance techniques,including nuclear magnetic resonance(NMR),magnetic resonance imaging(MRI)and electron paramagnetic resonance(EPR),are unique in terms of providing structural information at the atomic level and real-time phase and morphology evolution and characterizing ionic motion at various timescales.This special issue is dedicated to an editorial and a selection of papers on the theme of investigating energy storage materials/devices using magnetic resonance techniques.As the vip editors of this special issue,we are honored to introduce the following high-quality research articles and review articles.
基金supported by the National Natural Science Foundation of China(12222412 and 12047503)the National Key Projects for Research and Development of China(2024YFA1409200)+3 种基金the Innovation Program for Quantum Science and Technology(2021ZD0301900)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB1270100)the Postdoctoral Fellowship Program of CPSF(GZB20240772)We thank the HPC-ITP for the technical support and generous allocation of CPU time.Xiaoyu Wang acknowledges financial support from the National High Magnetic Field Laboratory through National Science Foundation(NSF)(DMR-2128556),and the State of Florida.
文摘Recent experimental advances have uncovered fractional Chern insulator(FCI)states in twisted MoTe_(2)(tMoTe_(2))systems under zero magnetic field.Understanding the interaction effects on topological phases within realistic model presents a significant theoretical challenge.Here,we construct a moirésuperlattice model tailored for tMoTe_(2)and conduct investigations using state-of-the-art tensor-network methods.Our ground-state calculations reveal a rich variety of interaction-driven and filling-dependent topological phases,including FCIs,Chern insulators,and generalized Wigner crystals,which are revealed in recent experiments.For FCI state,dynamical simulations uncover a single-particle excitation continuum with a finite charge gap,reflecting the fractionalized charge excitations.Finite-temperature calculations further determine characteristic charge activation and ferromagnetic transition temperatures,reconciling existing experimental discrepancies.Furthermore,using this realistic lattice model,we predict the presence of quantum anomalous Hall crystals exhibiting integer Hall conductivity at fractional fillings in tMoTe_(2).By integrating ground-state,finite-temperature,and dynamical analyses,our work establishes a comprehensive framework for understanding correlated topological phases in tMoTe_(2)and related moirésystems.
基金the National Natural Science Foundation of China(Grant No.11174343)the Ministry of Science and Technology of Chinathe Chinese Academy of Sciences
文摘High quality chromium （Cr） doped three-dimensional topological insulator （TI） Sb2Te3 films are grown via molecular beam epitaxy on heat-treated insulating SrTiO3 （111） substrates. We report that the Dirac surface states are insensitive to Cr doping, and a perfect robust long-range ferromagnetic order is unveiled in epitaxial Sb2 xCrxTe3 films. The anomalous Hall effect is modulated by applying a bottom gate, contrary to the ferromagnetism in conventional diluted magnetic semiconductors （DMSs）, here the coercivity field is not significantly changed with decreasing cartier density. Carrier-independent ferromag- netism heralds Sbz_xCrxTe3 films as the base candidate TI material to realize the quantum anomalous Hall （QAH） effect. These results also indicate the potential of controlling anomalous Hall voltage in future TI-based magneto-electronics and spintronics.
文摘The design optimization and analysis of charged particle beam systems employing intense beams requires a robust and accurate Poisson solver.This paper presents a new type of Poisson solver which allows the effects of space charge to be elegantly included into the system dynamics.This is done by casting the charge distribution function into a series of basis functions,which are then integrated with an appropriate Green’s function to find a Taylor series of the potential at a given point within the desired distribution region.In order to avoid singularities,a Duffy transformation is applied,which allows singularity-free integration and maximized convergence region when performed with the help of Differential Algebraic methods.The method is shown to perform well on the examples studied.Practical implementation choices and some of their limitations are also explored.
文摘The nano-crystalline materials with many special and super magnetic properties could be synthesized by fractional crystallization of amorphous alloys. Since this new method for preparation of nano-crystalline materials was introduced, the crystallization kinetics of amorphous alloys has been studied in more and more intensive investigations. So far, almost all experiments on the crystallization kinetics are conducted by differential
