Ionic liquid electrospray(ILE) in an atmospheric environment is often accompanied by the gas discharge phenomenon. It interferes with the normal operation of the electrospray and the measurement of experimental parame...Ionic liquid electrospray(ILE) in an atmospheric environment is often accompanied by the gas discharge phenomenon. It interferes with the normal operation of the electrospray and the measurement of experimental parameters. In this study, electrospray experiments were conducted on the ionic liquid EMI-BF4. The observations revealed that the operating modes of the ionic liquid depend on the voltage polarity at high voltages. Additionally, a correspondence between the operating mode of ILE and the current signal in the circuit was established. The shape of the liquid cone formed at the needle tip bore a striking resemblance to the plume of corona discharge, suggesting that the motion trajectory of electrons influenced the curvature of the liquid cone. Steamer theory provided a clear explanation for the change in curvature as the voltage increased.展开更多
An analytical expression of ampere’s force between two current rings in a compensated torsion balance is deduced here,the properties and stability of this force are discussed.The result of numerical estimation for ty...An analytical expression of ampere’s force between two current rings in a compensated torsion balance is deduced here,the properties and stability of this force are discussed.The result of numerical estimation for typical experimental parameters shows that the uncertainties of the force are smaller than 1×10^(-4) orders,which is very important for precise measurement of gravitational constant G.展开更多
Gravitational wave(GW) astronomy is witnessing a transformative shift from terrestrial to space-based detection, with missions like Taiji at the forefront. While the transition brings unprecedented opportunities for e...Gravitational wave(GW) astronomy is witnessing a transformative shift from terrestrial to space-based detection, with missions like Taiji at the forefront. While the transition brings unprecedented opportunities for exploring massive black hole binaries(MBHBs), it also imposes complex challenges in data analysis, particularly in parameter estimation amidst confusion noise.Addressing this gap, we utilize scalable normalizing flow models to achieve rapid and accurate inference within the Taiji environment. Innovatively, our approach simplifies the data's complexity, employs a transformation mapping to overcome the year-period time-dependent response function, and unveils additional multimodality in the arrival time parameter. Our method estimates MBHBs several orders of magnitude faster than conventional techniques, maintaining high accuracy even in complex backgrounds. These findings significantly enhance the efficiency of GW data analysis, paving the way for rapid detection and alerting systems and enriching our ability to explore the universe through space-based GW observation.展开更多
We repeated Saxl’s electrically charged pendulum experiment with an accuracy about one order higher.We found.no anomalous period change reported by him.Further experiment research shows that his result could be expla...We repeated Saxl’s electrically charged pendulum experiment with an accuracy about one order higher.We found.no anomalous period change reported by him.Further experiment research shows that his result could be explained if there were the affection of a capacitance between the pendulum disk and other part of the apparatus in his experiment.展开更多
We have carried out a high precision torsion balance experiment in searching for abnormally large coherent scattering cross sections between a sapphire crystal and solar-neutrino.According to the hypothesis and the ex...We have carried out a high precision torsion balance experiment in searching for abnormally large coherent scattering cross sections between a sapphire crystal and solar-neutrino.According to the hypothesis and the experimental results presented by J.Weber,a diurnal effect,which was 60 times larger than the noise level,should he observed obviously,but no significant diurnal effects were found at the level of 8.1 x 10^(-8) dyn in our experiment.展开更多
A new analytical expression of the radial Newtonian gravitational attraction of a finite cylinder is given. By means of a special transformation, it is proved that the new expression is equivalent to that given by A.H...A new analytical expression of the radial Newtonian gravitational attraction of a finite cylinder is given. By means of a special transformation, it is proved that the new expression is equivalent to that given by A.H. Cook et al., but much simpler in form.展开更多
The effect of gravitational wave (GW) on phonon in crystal lattice space with spiral dislocation is expressed as a gravitational perturbation in topological phonon space with background of the spiral dislocation.This ...The effect of gravitational wave (GW) on phonon in crystal lattice space with spiral dislocation is expressed as a gravitational perturbation in topological phonon space with background of the spiral dislocation.This is a new-type effect form of the GW field to the phonon.The corresponding phonon solutions are given.展开更多
基金supported by the National Key Research and Development Program of China(No.2020YFC2201004)National Natural Science Foundation of China(No.12172110)。
文摘Ionic liquid electrospray(ILE) in an atmospheric environment is often accompanied by the gas discharge phenomenon. It interferes with the normal operation of the electrospray and the measurement of experimental parameters. In this study, electrospray experiments were conducted on the ionic liquid EMI-BF4. The observations revealed that the operating modes of the ionic liquid depend on the voltage polarity at high voltages. Additionally, a correspondence between the operating mode of ILE and the current signal in the circuit was established. The shape of the liquid cone formed at the needle tip bore a striking resemblance to the plume of corona discharge, suggesting that the motion trajectory of electrons influenced the curvature of the liquid cone. Steamer theory provided a clear explanation for the change in curvature as the voltage increased.
文摘An analytical expression of ampere’s force between two current rings in a compensated torsion balance is deduced here,the properties and stability of this force are discussed.The result of numerical estimation for typical experimental parameters shows that the uncertainties of the force are smaller than 1×10^(-4) orders,which is very important for precise measurement of gravitational constant G.
基金supported by the National Key Research and Development Program of China (Grant Nos. 2021YFC2203004, and 2021YFC2201903)supported by the National Natural Science Foundation of China (Grant Nos. 12147103, and 12247187)the Fundamental Research Funds for the Central Universities。
文摘Gravitational wave(GW) astronomy is witnessing a transformative shift from terrestrial to space-based detection, with missions like Taiji at the forefront. While the transition brings unprecedented opportunities for exploring massive black hole binaries(MBHBs), it also imposes complex challenges in data analysis, particularly in parameter estimation amidst confusion noise.Addressing this gap, we utilize scalable normalizing flow models to achieve rapid and accurate inference within the Taiji environment. Innovatively, our approach simplifies the data's complexity, employs a transformation mapping to overcome the year-period time-dependent response function, and unveils additional multimodality in the arrival time parameter. Our method estimates MBHBs several orders of magnitude faster than conventional techniques, maintaining high accuracy even in complex backgrounds. These findings significantly enhance the efficiency of GW data analysis, paving the way for rapid detection and alerting systems and enriching our ability to explore the universe through space-based GW observation.
基金This work is partially supported by National Natural Science Foundation of China (11774102), the Scientific Research Funds and Promotion Program for Young and Middle-aged Teacher in Science & Technology Research of Huaqiao University (ZQN-YXS04, 17BS412), Open Fund of IPOC (BUPT), National Research Foundation Singapore (NRF) (NRF-CRP13-2014-05), European Union's Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie Grant Agreement (No. 798916) and Singapore Ministry of Education Academic Research Fund Tier 1 (RG89/16).
基金Supported by the National Natural Science Foundation of China.
文摘We repeated Saxl’s electrically charged pendulum experiment with an accuracy about one order higher.We found.no anomalous period change reported by him.Further experiment research shows that his result could be explained if there were the affection of a capacitance between the pendulum disk and other part of the apparatus in his experiment.
基金Supported by the National Natural Science Foundation of Chinathe HUO Yingdong Educational Foundation.
文摘We have carried out a high precision torsion balance experiment in searching for abnormally large coherent scattering cross sections between a sapphire crystal and solar-neutrino.According to the hypothesis and the experimental results presented by J.Weber,a diurnal effect,which was 60 times larger than the noise level,should he observed obviously,but no significant diurnal effects were found at the level of 8.1 x 10^(-8) dyn in our experiment.
文摘A new analytical expression of the radial Newtonian gravitational attraction of a finite cylinder is given. By means of a special transformation, it is proved that the new expression is equivalent to that given by A.H. Cook et al., but much simpler in form.
基金Project supported in part by the National Natural Science Foundation of China
文摘The effect of gravitational wave (GW) on phonon in crystal lattice space with spiral dislocation is expressed as a gravitational perturbation in topological phonon space with background of the spiral dislocation.This is a new-type effect form of the GW field to the phonon.The corresponding phonon solutions are given.