This paper focused on the influence of the shape and size of threshing frames as well as the grades of tobacco leaves on the structure of threshed leaves.The testing tobacco leaves all came from the hilly ecological r...This paper focused on the influence of the shape and size of threshing frames as well as the grades of tobacco leaves on the structure of threshed leaves.The testing tobacco leaves all came from the hilly ecological region of Nanling and belonged to burnt sweet,alcoholic sweet and scent category.The comprehensive evaluating value S was taken as the test index.Results showed that,without considering the influence of tobacco grade on leaf structure,the shapes of first-stage thresher five-link frames were all hexagons,and the combination with the sizes of 3.5,3.0,3.5,3.0,3.0 inches had the highest evaluating value S of 2.49.For tobacco grade C2FH,the shapes of first-stage thresher five-link frames were also hexagons,and the evaluating value S reached the highest value of 3.40 with sizes of 3.5,3.0,3.5,3.0,3.0 inches.Comprehensive analysis showed that:3.0 inch frame performed better in controlling the percentage of large-sized strips than 3.5 inch frame did;rhombic frames were better than hexagon frames in reducing the breakage rate of tobacco leaves;different shapes or sizes of nonadjacent two-link frames can help to improve the threshing quality.展开更多
The intermediate mass dileptons from the quark phase,secondary hadronic processes and background sources have been studied based on a relativistic hydrodynamic model.Due to the effect of the phase boundary on the evol...The intermediate mass dileptons from the quark phase,secondary hadronic processes and background sources have been studied based on a relativistic hydrodynamic model.Due to the effect of the phase boundary on the evolution of the system the contribution from the quark phase is much more important than that from secondary processes and is even comparable with that from background sources.This leads to a spectrum without the obvious humps of the hadronic phase contribution and the yield increasing with the incident energy of colliding nuclei.It is shown that the enhancement of dileptons is a signature for the formation of the quark--gluon plasma.展开更多
Dilepton production during the chemical equilibration of quark-gluon matter with a finite baryon density has been studied. We find that due to the slowing down of the cooling rate and the high initial temperature of t...Dilepton production during the chemical equilibration of quark-gluon matter with a finite baryon density has been studied. We find that due to the slowing down of the cooling rate and the high initial temperature of the quark-gluon matter produced at RHIC energies, the quark phase contribution to dileptons with intermediate masses is significantly heightened and is much larger than that calculated by the evolution of the thermodynamic equilibrium system. The latter has shown an enhancement of intermediate mass dileptons from the quark phase. Therefore, such an enhancement of dileptons should be a signature for quark-gluon matter formation.展开更多
Under thermodynamic equilibrium, the initial values of the quark-gluon system from relativistic nucleus-nucleus collisions are obtained. From these initial values we have studied the dilepton production on the basis o...Under thermodynamic equilibrium, the initial values of the quark-gluon system from relativistic nucleus-nucleus collisions are obtained. From these initial values we have studied the dilepton production on the basis of the relativistic hydrodynamic model, and found that with increasing incident energy a characteristic plateau indicating the formation of the quark-gluon plasma appears in the total yield.展开更多
From the full stopping scenario,a relativistic hydrodynamic model describing the evolution of the baryon-rich quark-gluon matter fire-cylinder has been established.Based on it,the rapidity Distribution of dileptons wi...From the full stopping scenario,a relativistic hydrodynamic model describing the evolution of the baryon-rich quark-gluon matter fire-cylinder has been established.Based on it,the rapidity Distribution of dileptons with intermediate invariant masses has been studied.It is found that the quark phase gives the dominant contribution to the dilepton spectrum due to the influence of the phase boundary on the evolution of the system,especially the dilepton yield is strongly suppressed with the increasing rapidity.展开更多
From the full stopping scenario and considered the Drell-Yang background, the rapidity dependence of the dilepton production from the central collision 197Au + 197Au has been studied in the baryon-rich quark-gluon mat...From the full stopping scenario and considered the Drell-Yang background, the rapidity dependence of the dilepton production from the central collision 197Au + 197Au has been studied in the baryon-rich quark-gluon matter by using a relativistic hydrodynamic model.It can be found that the dilepton yield is strongly suppressed as increasing the rapidity. Such a characteristic signaling the formation of the baryon-rich quark-gluon matter can be tested in future experiments at CERN and Brookhaven.展开更多
Debye screening mass at the next-to-leading order is studied by the resummation method based on perturbation theory at finite temperature.We find that the critical temperature for the J/ψdissociation is 0.211 GeV.The...Debye screening mass at the next-to-leading order is studied by the resummation method based on perturbation theory at finite temperature.We find that the critical temperature for the J/ψdissociation is 0.211 GeV.The contributions from the next-to-leading order are important,and critical temperature and chemical potential are shifted lower values.展开更多
In the study of dilepton production of a baryon-rich quark-gluon fireball based on the full stopping scenario via a relativistic hydrodynamic model,it is found that for the fixed initial baryon chemical potential with...In the study of dilepton production of a baryon-rich quark-gluon fireball based on the full stopping scenario via a relativistic hydrodynamic model,it is found that for the fixed initial baryon chemical potential with increasing initial temperature a peak indicating the formation of the baryon-rich quark-gluon matter appears in the total dilepton yield.展开更多
From the full stopping scenario,the dilepton production in the baryon-rich quark-gluon fireball based on a relativistic hydrodynamic model is studied,and it is found that with increasing incident energy a characterist...From the full stopping scenario,the dilepton production in the baryon-rich quark-gluon fireball based on a relativistic hydrodynamic model is studied,and it is found that with increasing incident energy a characteristic plateau indicating the formation of the baryon-rich quark-gluon matter appears in the total yield.展开更多
Based on a relativistic hydrodynamic model,the dilepton production in a baryon-rich quark-gluon fireball is studied.We Hnd that at invariant masses between 2mπ and 1 GeV,with increasing initial baryon density,a chara...Based on a relativistic hydrodynamic model,the dilepton production in a baryon-rich quark-gluon fireball is studied.We Hnd that at invariant masses between 2mπ and 1 GeV,with increasing initial baryon density,a characteristic valley and a subsequent peak appear in the total dilepton yield,which signal more uniquely the baryon-rich quark-gluon matter formation and can be tested in future experiments at CERN and Brookhaven.展开更多
文摘This paper focused on the influence of the shape and size of threshing frames as well as the grades of tobacco leaves on the structure of threshed leaves.The testing tobacco leaves all came from the hilly ecological region of Nanling and belonged to burnt sweet,alcoholic sweet and scent category.The comprehensive evaluating value S was taken as the test index.Results showed that,without considering the influence of tobacco grade on leaf structure,the shapes of first-stage thresher five-link frames were all hexagons,and the combination with the sizes of 3.5,3.0,3.5,3.0,3.0 inches had the highest evaluating value S of 2.49.For tobacco grade C2FH,the shapes of first-stage thresher five-link frames were also hexagons,and the evaluating value S reached the highest value of 3.40 with sizes of 3.5,3.0,3.5,3.0,3.0 inches.Comprehensive analysis showed that:3.0 inch frame performed better in controlling the percentage of large-sized strips than 3.5 inch frame did;rhombic frames were better than hexagon frames in reducing the breakage rate of tobacco leaves;different shapes or sizes of nonadjacent two-link frames can help to improve the threshing quality.
基金Supported in part by the 95'Key Project Funds of the Chinese Academy of Sciences under Grant No.KJ 951-A1-410the National Natural Science Foundation of China under Grant Nos.10075051,59831020 and 19975053.
文摘The intermediate mass dileptons from the quark phase,secondary hadronic processes and background sources have been studied based on a relativistic hydrodynamic model.Due to the effect of the phase boundary on the evolution of the system the contribution from the quark phase is much more important than that from secondary processes and is even comparable with that from background sources.This leads to a spectrum without the obvious humps of the hadronic phase contribution and the yield increasing with the incident energy of colliding nuclei.It is shown that the enhancement of dileptons is a signature for the formation of the quark--gluon plasma.
基金Supported in part by 95'Key Funds of the Chinese Academy of Sciences(KJ951-A1-410)the National Natural Science Foundation of China under Grant No.10075051Major State Basic Research Development Programme in China under Contract No.G200077400。
文摘Dilepton production during the chemical equilibration of quark-gluon matter with a finite baryon density has been studied. We find that due to the slowing down of the cooling rate and the high initial temperature of the quark-gluon matter produced at RHIC energies, the quark phase contribution to dileptons with intermediate masses is significantly heightened and is much larger than that calculated by the evolution of the thermodynamic equilibrium system. The latter has shown an enhancement of intermediate mass dileptons from the quark phase. Therefore, such an enhancement of dileptons should be a signature for quark-gluon matter formation.
基金95'Key Funds of the Chinese Academy of Sciences(KJ951-A1-410)the National Natural Science Foundation of China under Grant No.19475060.
文摘Under thermodynamic equilibrium, the initial values of the quark-gluon system from relativistic nucleus-nucleus collisions are obtained. From these initial values we have studied the dilepton production on the basis of the relativistic hydrodynamic model, and found that with increasing incident energy a characteristic plateau indicating the formation of the quark-gluon plasma appears in the total yield.
基金Supported by the 95'Key Project Funds of the Chinese Academy of Sciences under Grant No.KJ 951-A1-410.
文摘From the full stopping scenario,a relativistic hydrodynamic model describing the evolution of the baryon-rich quark-gluon matter fire-cylinder has been established.Based on it,the rapidity Distribution of dileptons with intermediate invariant masses has been studied.It is found that the quark phase gives the dominant contribution to the dilepton spectrum due to the influence of the phase boundary on the evolution of the system,especially the dilepton yield is strongly suppressed with the increasing rapidity.
文摘From the full stopping scenario and considered the Drell-Yang background, the rapidity dependence of the dilepton production from the central collision 197Au + 197Au has been studied in the baryon-rich quark-gluon matter by using a relativistic hydrodynamic model.It can be found that the dilepton yield is strongly suppressed as increasing the rapidity. Such a characteristic signaling the formation of the baryon-rich quark-gluon matter can be tested in future experiments at CERN and Brookhaven.
基金Supported by the National Natural Science Foundation of China under Grant No.19675044.
文摘Debye screening mass at the next-to-leading order is studied by the resummation method based on perturbation theory at finite temperature.We find that the critical temperature for the J/ψdissociation is 0.211 GeV.The contributions from the next-to-leading order are important,and critical temperature and chemical potential are shifted lower values.
基金Supported in part by the Grant LWTZ-1298 of Chinese Academy of Sciencesthe National Natural Science Foundation of China.
文摘In the study of dilepton production of a baryon-rich quark-gluon fireball based on the full stopping scenario via a relativistic hydrodynamic model,it is found that for the fixed initial baryon chemical potential with increasing initial temperature a peak indicating the formation of the baryon-rich quark-gluon matter appears in the total dilepton yield.
基金Supported by the National Natural Science Foundation of China under Grant No.19475060.
文摘From the full stopping scenario,the dilepton production in the baryon-rich quark-gluon fireball based on a relativistic hydrodynamic model is studied,and it is found that with increasing incident energy a characteristic plateau indicating the formation of the baryon-rich quark-gluon matter appears in the total yield.
基金Supported in part by the Grant LWTZ-1298 of Chinese Academy of Sciencesthe National Natural Science Foundation of China。
文摘Based on a relativistic hydrodynamic model,the dilepton production in a baryon-rich quark-gluon fireball is studied.We Hnd that at invariant masses between 2mπ and 1 GeV,with increasing initial baryon density,a characteristic valley and a subsequent peak appear in the total dilepton yield,which signal more uniquely the baryon-rich quark-gluon matter formation and can be tested in future experiments at CERN and Brookhaven.
