Using minute rainfall data of automatic ground station and a variety of products from new generation Doppler weather radar in Wuchuan, the characteristics of a short-time heavy precipitation process on April 23, 2022 ...Using minute rainfall data of automatic ground station and a variety of products from new generation Doppler weather radar in Wuchuan, the characteristics of a short-time heavy precipitation process on April 23, 2022 were analyzed. The results showed that the appearance of differential reflectivity(ZDR) column and big-value zone of high-elevation ZDR had better indication on short-term heavy rainfall process in Shichao station. Ice phase process played a very important role in particle growth. The storm tracking information product can predict the path of the storm 15 min in advance. The storm stayed and moved less or even turned back to more than two to three scanning volumes in one place, indicating the occurrence of short-term heavy rainfall. One-hour accumulated precipitation(OHP) had a good effect on the estimation of continuous precipitation in a large area where the hourly rainfall exceeded 50 mm for more than two stations. It had the ability to estimate short-term heavy precipitation in areas lacking automatic stations.展开更多
Owing to their charge-free property,magnons are highly promising for achieving dissipationless transport without Joule heating,and are thus potentially applicable to energy-efficient devices.Here,we investigate valley...Owing to their charge-free property,magnons are highly promising for achieving dissipationless transport without Joule heating,and are thus potentially applicable to energy-efficient devices.Here,we investigate valley magnons and associated valley modulations in a kagome ferromagnetic lattice with staggered exchange interaction and Dzyaloshinskii-Moriya interaction.The staggered exchange interaction breaks the spatial inversion symmetry,leading to a valley magnon Hall effect.With nonzero Dzyaloshinskii-Moriya interaction in a staggered kagome lattice,the magnon Hall effect can be observed from only one valley.Moreover,reversing the Dzyaloshinskii-Moriya interaction(D→-D)and exchanging J_(1)and J_(2)(J_(1)■J_(2))can also regulate the position of the unequal valleys.With increasing Dzyaloshinskii-Moriya interaction,a series of topological phase transitions appear when two bands come to touch and split at the valleys.The valley Hall effect and topological phase transitions observed in kagome magnon lattices can be realized in thin films of insulating ferromagnets such as Lu_(2)V_(2)O_(7),and will extend the basis for magnonics applications in the future.展开更多
Based on the residual implication of continuous triangular norms,we obtain the expression of residual operator for extended operators(type-2 triangular norms)of continuous triangular norms on convex normal upper semi-...Based on the residual implication of continuous triangular norms,we obtain the expression of residual operator for extended operators(type-2 triangular norms)of continuous triangular norms on convex normal upper semi-continuous fuzzy truth values,answering an open problem in[D.LI,Inf.Sci.,2015,317:259-277].展开更多
The establishment of energy balance equation is necessary to study the thermo-mechanical properties of unsaturated soils.To solve this equation,the determination of two fundamental parameters as volumetric specific pa...The establishment of energy balance equation is necessary to study the thermo-mechanical properties of unsaturated soils.To solve this equation,the determination of two fundamental parameters as volumetric specific parameter and thermal conductivity coefficient is essential.In this paper,the effective thermal conductivity coefficient of dry soil grain is analyzed for soils with different compositions,and the thermo-mechanical properties of porous media with water and gas are studied by considering the soil water retention curve（SWRC）.Different methods,i.e.volumetric average method,self-consistent method,Hashin-Strikman method,are employed to calculate thermal conductivity coefficients,and a new method is proposed to determine the thermo-mechanical parameters.Comparison of the results obtained by different methods shows that the proposed method is in a good agreement with the experimental results and is suitable for describing the main properties of the thermo-mechanical behaviors of soils.The relationship between the SWRC and the seepage curve is further studied by the natural proportional rule.The characteristics of the SWRC,its differential coefficient and the seepage curve,are investigated by considering the physico-mechanical mechanism;the limit scopes of the indices of the SWRC and the seepage curve are also given.展开更多
Since the discovery of T_(cc)by LHCb,there has been considerable interest in T_(cc)and its heavy-flavor partners.However,the study of its strange partner T_(ss)has been largely overlooked.Within the framework of the c...Since the discovery of T_(cc)by LHCb,there has been considerable interest in T_(cc)and its heavy-flavor partners.However,the study of its strange partner T_(ss)has been largely overlooked.Within the framework of the chiral quark model,we conducted a systematic study of the bound states of T_(ss)based on the Gaussian Expansion Method.We considered all physical channels with 01^(+),including molecular and diquark structures.Moreover,by considering the coupling between diquarks and molecular states,our calculations allowed us to identify a deep bound state with a bounding energy of 60 MeV primarily composed of KK^(*).Using the^(3)P_(0)model,we calculated the decay width of K^(*)within the KK^(*)bound state,which is approximated as the decay width of the bound state in the T_(ss)system.These results indicate that,owing to the effect of binding energy,the decay width of K^(*)in KK^(*)is approximately 3 MeV smaller than that of K^(*)in vacuum.Additionally,resonance state calculations were performed.We used the real-scaling method to search for possible resonance states in the T_(ss)sysytem.Because of the strong attraction in the[K^(*)]_(8)[K^(*)]_(8)configuration,four resonance states were found in the vicinity of 2.2-2.8 GeV,predominantly featuring hidden-color structures.The decay widths of these states are less than 10 MeV.We strongly recommend experimental efforts to search for the resonance states in the T_(ss)system predicted by our calculations.展开更多
文摘Using minute rainfall data of automatic ground station and a variety of products from new generation Doppler weather radar in Wuchuan, the characteristics of a short-time heavy precipitation process on April 23, 2022 were analyzed. The results showed that the appearance of differential reflectivity(ZDR) column and big-value zone of high-elevation ZDR had better indication on short-term heavy rainfall process in Shichao station. Ice phase process played a very important role in particle growth. The storm tracking information product can predict the path of the storm 15 min in advance. The storm stayed and moved less or even turned back to more than two to three scanning volumes in one place, indicating the occurrence of short-term heavy rainfall. One-hour accumulated precipitation(OHP) had a good effect on the estimation of continuous precipitation in a large area where the hourly rainfall exceeded 50 mm for more than two stations. It had the ability to estimate short-term heavy precipitation in areas lacking automatic stations.
基金support from the Funding for School-level Research Projects of Yancheng Institute of Technology(Grant Nos.xjr2020038,xjr2022039,and xjr2022040)。
文摘Owing to their charge-free property,magnons are highly promising for achieving dissipationless transport without Joule heating,and are thus potentially applicable to energy-efficient devices.Here,we investigate valley magnons and associated valley modulations in a kagome ferromagnetic lattice with staggered exchange interaction and Dzyaloshinskii-Moriya interaction.The staggered exchange interaction breaks the spatial inversion symmetry,leading to a valley magnon Hall effect.With nonzero Dzyaloshinskii-Moriya interaction in a staggered kagome lattice,the magnon Hall effect can be observed from only one valley.Moreover,reversing the Dzyaloshinskii-Moriya interaction(D→-D)and exchanging J_(1)and J_(2)(J_(1)■J_(2))can also regulate the position of the unequal valleys.With increasing Dzyaloshinskii-Moriya interaction,a series of topological phase transitions appear when two bands come to touch and split at the valleys.The valley Hall effect and topological phase transitions observed in kagome magnon lattices can be realized in thin films of insulating ferromagnets such as Lu_(2)V_(2)O_(7),and will extend the basis for magnonics applications in the future.
基金Supported by the Natural Science Foundation of Sichuan Province(Grant No.2022NSFSC1821)the National Natural Science Foundation of China(Grant No.12261018)+2 种基金Universities Key Laboratory of Mathematical Modeling and Data Mining in Guizhou Province(Grant No.2023013)High Level Innovative Talent Training Plan Project of Guizhou Province(Grant No.GCC[2023]006)the Key Natural Science Foundation of Universities in Guangdong Province(Grant No.2019KZDXM027)。
文摘Based on the residual implication of continuous triangular norms,we obtain the expression of residual operator for extended operators(type-2 triangular norms)of continuous triangular norms on convex normal upper semi-continuous fuzzy truth values,answering an open problem in[D.LI,Inf.Sci.,2015,317:259-277].
基金Supported by the National Natural Science Foundation of China(50779030,50879044,2008BAB29B03)the National Defenses Bureau(838)
文摘The establishment of energy balance equation is necessary to study the thermo-mechanical properties of unsaturated soils.To solve this equation,the determination of two fundamental parameters as volumetric specific parameter and thermal conductivity coefficient is essential.In this paper,the effective thermal conductivity coefficient of dry soil grain is analyzed for soils with different compositions,and the thermo-mechanical properties of porous media with water and gas are studied by considering the soil water retention curve（SWRC）.Different methods,i.e.volumetric average method,self-consistent method,Hashin-Strikman method,are employed to calculate thermal conductivity coefficients,and a new method is proposed to determine the thermo-mechanical parameters.Comparison of the results obtained by different methods shows that the proposed method is in a good agreement with the experimental results and is suitable for describing the main properties of the thermo-mechanical behaviors of soils.The relationship between the SWRC and the seepage curve is further studied by the natural proportional rule.The characteristics of the SWRC,its differential coefficient and the seepage curve,are investigated by considering the physico-mechanical mechanism;the limit scopes of the indices of the SWRC and the seepage curve are also given.
基金Supported partly by the National Natural Science Foundation of China(12205249)the Funding for School-Level Research Projects of Yancheng Institute of Technology(xjr2022039,xjr2022040,xjr2020038)。
文摘Since the discovery of T_(cc)by LHCb,there has been considerable interest in T_(cc)and its heavy-flavor partners.However,the study of its strange partner T_(ss)has been largely overlooked.Within the framework of the chiral quark model,we conducted a systematic study of the bound states of T_(ss)based on the Gaussian Expansion Method.We considered all physical channels with 01^(+),including molecular and diquark structures.Moreover,by considering the coupling between diquarks and molecular states,our calculations allowed us to identify a deep bound state with a bounding energy of 60 MeV primarily composed of KK^(*).Using the^(3)P_(0)model,we calculated the decay width of K^(*)within the KK^(*)bound state,which is approximated as the decay width of the bound state in the T_(ss)system.These results indicate that,owing to the effect of binding energy,the decay width of K^(*)in KK^(*)is approximately 3 MeV smaller than that of K^(*)in vacuum.Additionally,resonance state calculations were performed.We used the real-scaling method to search for possible resonance states in the T_(ss)sysytem.Because of the strong attraction in the[K^(*)]_(8)[K^(*)]_(8)configuration,four resonance states were found in the vicinity of 2.2-2.8 GeV,predominantly featuring hidden-color structures.The decay widths of these states are less than 10 MeV.We strongly recommend experimental efforts to search for the resonance states in the T_(ss)system predicted by our calculations.
