In the past few years,attention has mainly been focused on the symmetric Brownian motor(BM)with Gaussian noises,whose current and energy conversion efficiency are very low.Here,we investigate the operating performance...In the past few years,attention has mainly been focused on the symmetric Brownian motor(BM)with Gaussian noises,whose current and energy conversion efficiency are very low.Here,we investigate the operating performance of the symmetric BM subjected to Lévy noise.Through numerical simulations,it is found that the operating performance of the motor can be greatly improved in asymmetric Lévy noise.Without any load,the Lévy noises with smaller stable indexes can let the motor give rise to a much greater current.With a load,the energy conversion efficiency of the motor can be enhanced by adjusting the stable indexes of the Lévy noises with symmetry breaking.The results of this research are of great significance for opening up BM’s intrinsic physical mechanism and promoting the development of nanotechnology.展开更多
The physical properties of the symmetric and antisymmetric motions,such as the conservation of the ab- solute angular momentum,the mutual conversions between various forms of energy,have been analysed by using the set...The physical properties of the symmetric and antisymmetric motions,such as the conservation of the ab- solute angular momentum,the mutual conversions between various forms of energy,have been analysed by using the sets of equaticns in p-coordinates controlling the motions in the primitive equation model atmosphere.The results show that only the symmetric component of zoral geopotential difference caused by orography and that of the zonal frictional torque,have contribution to the change of the global angular momentum,and that the mutual conversions between various forms of energy,in addition to those similar to the results in the classical case, irclude those associated with the symmetric and antisymmetric motions.展开更多
In this paper,we point out some deficiencies in a recent paper(Lee and Kim in J.Nonlinear Convex Anal.13:599–614,2012),and we establish strong duality and converse duality theorems for two types of nondifferentiable...In this paper,we point out some deficiencies in a recent paper(Lee and Kim in J.Nonlinear Convex Anal.13:599–614,2012),and we establish strong duality and converse duality theorems for two types of nondifferentiable higher-order symmetric duals multiobjective programming involving cones.展开更多
FWHM calibration is one of the essential procedures in gamma-ray spectra analysis.Traditional method is time consumption and poor flexibility because of extra measurement on calibration source.This paper introduces an...FWHM calibration is one of the essential procedures in gamma-ray spectra analysis.Traditional method is time consumption and poor flexibility because of extra measurement on calibration source.This paper introduces an implicit calibration method based on symmetric zero-area conversion.The single peaks can be differentiated from doublets.Meanwhile,the extracted FWHM values can be applied in the fitting process.Various forms of calibration equations are introduced and compared with practical spectrum data under this method.展开更多
拉曼光谱法是一种高效、无损的化学信息获取分析方法。拉曼光谱中的特征峰位包含了物质的化学信息。对称零面积变换寻峰法是一种常用的寻峰方法,但在寻峰前需要输入有关谱线的各项参数,如窗宽、洛伦兹函数半峰全宽、高斯函数半峰全宽等...拉曼光谱法是一种高效、无损的化学信息获取分析方法。拉曼光谱中的特征峰位包含了物质的化学信息。对称零面积变换寻峰法是一种常用的寻峰方法,但在寻峰前需要输入有关谱线的各项参数,如窗宽、洛伦兹函数半峰全宽、高斯函数半峰全宽等等。对于不同的拉曼光谱,需要输入的这些参数可能不同。如果输入参数与当前拉曼光谱不符合,寻得的峰位可能不准确。本文对对称零面积法进行改进,将拉曼光谱谱峰的半峰全宽归一化,减少了需要输入的各项参数,并结合Whittaker Smoother去噪算法和非对称加权惩罚最小二乘(arPLS)去基线算法,形成WALPSZ寻峰算法。该算法提高了对不同分辨率的拉曼光谱寻峰的准确性和普适性。将该算法应用于Raman Open Database和实际测量的光谱数据的寻峰中,并将获取的峰位与相关文献的数据进行对比,验证了其可靠性和对不同拉曼光谱数据的适用性。展开更多
In this study,the movement of the maximum wind of Typhoon Rammasun(2014)was measured by the radial movement of the maximum symmetric rotational kinetic energy.The weather research and forecasting(WRF)model was used to...In this study,the movement of the maximum wind of Typhoon Rammasun(2014)was measured by the radial movement of the maximum symmetric rotational kinetic energy.The weather research and forecasting(WRF)model was used to simulate Typhoon Rammasun,and validated simulation data for the lower troposphere were analyzed to examine the physical processes responsible for the radial movement of the maximum wind.The radii,where maximum symmetric rotational kinetic energy and its maximum tendency were located,were compared to explain radial movement.The tendency in the lower troposphere is controlled by the flux convergence of symmetric rotational kinetic energy and the conversion from symmetric divergent kinetic energy to symmetric rotational kinetic energy,as well as frictional dissipation in the symmetric rotational kinetic energy budget.The inward movement before rapid intensification(RI)resulted from radial flux convergence;cyclonic circulation develops while moving inward.Stationary maximum symmetric rotational kinetic energy and RI were caused by the conversion,which was observed to be proportional to the symmetric rotational kinetic energy.Landfall increased terrain-induced friction dissipation,which led to outward movement and ended the RI.展开更多
基金Project supported by the Research Group of Nonequilibrium Statistics(Grant No.14078206)Kunming University of Science and Technology,China.
文摘In the past few years,attention has mainly been focused on the symmetric Brownian motor(BM)with Gaussian noises,whose current and energy conversion efficiency are very low.Here,we investigate the operating performance of the symmetric BM subjected to Lévy noise.Through numerical simulations,it is found that the operating performance of the motor can be greatly improved in asymmetric Lévy noise.Without any load,the Lévy noises with smaller stable indexes can let the motor give rise to a much greater current.With a load,the energy conversion efficiency of the motor can be enhanced by adjusting the stable indexes of the Lévy noises with symmetry breaking.The results of this research are of great significance for opening up BM’s intrinsic physical mechanism and promoting the development of nanotechnology.
文摘The physical properties of the symmetric and antisymmetric motions,such as the conservation of the ab- solute angular momentum,the mutual conversions between various forms of energy,have been analysed by using the sets of equaticns in p-coordinates controlling the motions in the primitive equation model atmosphere.The results show that only the symmetric component of zoral geopotential difference caused by orography and that of the zonal frictional torque,have contribution to the change of the global angular momentum,and that the mutual conversions between various forms of energy,in addition to those similar to the results in the classical case, irclude those associated with the symmetric and antisymmetric motions.
基金This work was partially supported by the National Natural Science Foundation of China(Nos.11271391 and 10831009)d the Natural Science Foundation of Chongqing(CSTC,No.2011BA0030).
文摘In this paper,we point out some deficiencies in a recent paper(Lee and Kim in J.Nonlinear Convex Anal.13:599–614,2012),and we establish strong duality and converse duality theorems for two types of nondifferentiable higher-order symmetric duals multiobjective programming involving cones.
基金Supported by National Nature Science Foundation of China(No.11175101)
文摘FWHM calibration is one of the essential procedures in gamma-ray spectra analysis.Traditional method is time consumption and poor flexibility because of extra measurement on calibration source.This paper introduces an implicit calibration method based on symmetric zero-area conversion.The single peaks can be differentiated from doublets.Meanwhile,the extracted FWHM values can be applied in the fitting process.Various forms of calibration equations are introduced and compared with practical spectrum data under this method.
文摘拉曼光谱法是一种高效、无损的化学信息获取分析方法。拉曼光谱中的特征峰位包含了物质的化学信息。对称零面积变换寻峰法是一种常用的寻峰方法,但在寻峰前需要输入有关谱线的各项参数,如窗宽、洛伦兹函数半峰全宽、高斯函数半峰全宽等等。对于不同的拉曼光谱,需要输入的这些参数可能不同。如果输入参数与当前拉曼光谱不符合,寻得的峰位可能不准确。本文对对称零面积法进行改进,将拉曼光谱谱峰的半峰全宽归一化,减少了需要输入的各项参数,并结合Whittaker Smoother去噪算法和非对称加权惩罚最小二乘(arPLS)去基线算法,形成WALPSZ寻峰算法。该算法提高了对不同分辨率的拉曼光谱寻峰的准确性和普适性。将该算法应用于Raman Open Database和实际测量的光谱数据的寻峰中,并将获取的峰位与相关文献的数据进行对比,验证了其可靠性和对不同拉曼光谱数据的适用性。
基金supported by the National Natural Science Foundation of China(Grant No.41930967).
文摘In this study,the movement of the maximum wind of Typhoon Rammasun(2014)was measured by the radial movement of the maximum symmetric rotational kinetic energy.The weather research and forecasting(WRF)model was used to simulate Typhoon Rammasun,and validated simulation data for the lower troposphere were analyzed to examine the physical processes responsible for the radial movement of the maximum wind.The radii,where maximum symmetric rotational kinetic energy and its maximum tendency were located,were compared to explain radial movement.The tendency in the lower troposphere is controlled by the flux convergence of symmetric rotational kinetic energy and the conversion from symmetric divergent kinetic energy to symmetric rotational kinetic energy,as well as frictional dissipation in the symmetric rotational kinetic energy budget.The inward movement before rapid intensification(RI)resulted from radial flux convergence;cyclonic circulation develops while moving inward.Stationary maximum symmetric rotational kinetic energy and RI were caused by the conversion,which was observed to be proportional to the symmetric rotational kinetic energy.Landfall increased terrain-induced friction dissipation,which led to outward movement and ended the RI.
