为了提高三维空间助力机械臂的设计效率,运用拉格朗日方法建立机械臂的动力学模型,利用SolidWorks建立三维空间助力机械臂的构件模型,将装配后三维实体模型导入A D A M S中进行动力学仿真分析,得到相关性能曲线图,为空间助力机械臂的结...为了提高三维空间助力机械臂的设计效率,运用拉格朗日方法建立机械臂的动力学模型,利用SolidWorks建立三维空间助力机械臂的构件模型,将装配后三维实体模型导入A D A M S中进行动力学仿真分析,得到相关性能曲线图,为空间助力机械臂的结构设计和最优控制提供依据。展开更多
在格点量子色动力学的模拟中,Rational Hybrid Monte Carlo (RHMC)算法是一种精确的,能应用到任意多个味道数的费米子的方法.它的思想是把费米子行列式展开为有理函数的形式.但该方法会带来很多彼此相差一个常对角矩阵的矩阵的求逆的计...在格点量子色动力学的模拟中,Rational Hybrid Monte Carlo (RHMC)算法是一种精确的,能应用到任意多个味道数的费米子的方法.它的思想是把费米子行列式展开为有理函数的形式.但该方法会带来很多彼此相差一个常对角矩阵的矩阵的求逆的计算,消耗大量的时间和计算资源,限制了RHMC算法的应用.本文利用移位多项式,针对共轭梯度法得到多个含有不同质量项的矩阵求逆的一种方法,该方法可以应用到RHMC算法中.展开更多
We present the results for the transition temperature of quantum chromodynamics （QCD） with two degenerate flavours （Nf = 2） of Wilson quarks. On lattice 8^3 × 4 with 4 representing the temporal extent, by usi...We present the results for the transition temperature of quantum chromodynamics （QCD） with two degenerate flavours （Nf = 2） of Wilson quarks. On lattice 8^3 × 4 with 4 representing the temporal extent, by using the Ferrenberg-Swendsen reweighting method, we determine the critical β = 6/g^2 where the transition occurs, g is the coupling constant. On lattice 8^2 × 20 × 4, by using the axial vector Ward-Takahashi identity, we calculate the current quark mass amq, a is the lattice spacing. Assuming the O（4） scaling, the critical β in the chiral limit is determined. We calculate the p meson mass amp at zero temperature on lattice 8^3 × 20. By using the experimental p meson mass to set the scale, we obtain 194（1） MeV for the transition temperature in the chiral limit.展开更多
The results on the curvature of a pseudocritical transition line for two-flavor QCD through lattice simulations are presented. The simulations are carried out with Symanzik-improved gauge action and Asqtad fermion act...The results on the curvature of a pseudocritical transition line for two-flavor QCD through lattice simulations are presented. The simulations are carried out with Symanzik-improved gauge action and Asqtad fermion action on a lattice 12^3×4 at quark mass am = 0.010. At the imaginary chemical potentials aμ1 = 0.050, 0.150, 0.200, 0.225 and 0.250, we investigate the chiral condensate ψψ, plaquette variable P and imaginary part of Polyakov loop Im（L） and their susceptibilities. Analytic continuation from an imaginary chemical potential to a real one is used to obtain the expression for transition temperature as a function of the chemical potential. The curvature is 0.0326（46）.展开更多
We present the results for the transition temperature of quantum chromodynamics with two degenerate flavors （Nf=2） of Wilson quarks as a function of a small baryon chemical potential μB from Monte Carlo simulations...We present the results for the transition temperature of quantum chromodynamics with two degenerate flavors （Nf=2） of Wilson quarks as a function of a small baryon chemical potential μB from Monte Carlo simulations at κ=0.175, κ is the hopping parameter. By using the imaginary chemical potential for which the fermion determinant is positive and the Ferrenberg-Swendsen reweighting method, we perform simulations on lattice 83×4 with 4 being the temporal extent. By analytic continuation of the data to the real chemical potential μ, we obtain the transition temperature for the small chemical potential, and compare our results with others.展开更多
文摘在格点量子色动力学的模拟中,Rational Hybrid Monte Carlo (RHMC)算法是一种精确的,能应用到任意多个味道数的费米子的方法.它的思想是把费米子行列式展开为有理函数的形式.但该方法会带来很多彼此相差一个常对角矩阵的矩阵的求逆的计算,消耗大量的时间和计算资源,限制了RHMC算法的应用.本文利用移位多项式,针对共轭梯度法得到多个含有不同质量项的矩阵求逆的一种方法,该方法可以应用到RHMC算法中.
文摘We present the results for the transition temperature of quantum chromodynamics （QCD） with two degenerate flavours （Nf = 2） of Wilson quarks. On lattice 8^3 × 4 with 4 representing the temporal extent, by using the Ferrenberg-Swendsen reweighting method, we determine the critical β = 6/g^2 where the transition occurs, g is the coupling constant. On lattice 8^2 × 20 × 4, by using the axial vector Ward-Takahashi identity, we calculate the current quark mass amq, a is the lattice spacing. Assuming the O（4） scaling, the critical β in the chiral limit is determined. We calculate the p meson mass amp at zero temperature on lattice 8^3 × 20. By using the experimental p meson mass to set the scale, we obtain 194（1） MeV for the transition temperature in the chiral limit.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11347029 and 11105033
文摘The results on the curvature of a pseudocritical transition line for two-flavor QCD through lattice simulations are presented. The simulations are carried out with Symanzik-improved gauge action and Asqtad fermion action on a lattice 12^3×4 at quark mass am = 0.010. At the imaginary chemical potentials aμ1 = 0.050, 0.150, 0.200, 0.225 and 0.250, we investigate the chiral condensate ψψ, plaquette variable P and imaginary part of Polyakov loop Im（L） and their susceptibilities. Analytic continuation from an imaginary chemical potential to a real one is used to obtain the expression for transition temperature as a function of the chemical potential. The curvature is 0.0326（46）.
基金Supported in part by the National Natural Science Foundation of China under Grant No 10847137, the Science Foundation of Jiangsu University （1283000345）, and the Knowledge Innovation Project of Chinese Academy of Sciences under Grant No KJCX2-YW-W10.
文摘We present the results for the transition temperature of quantum chromodynamics with two degenerate flavors （Nf=2） of Wilson quarks as a function of a small baryon chemical potential μB from Monte Carlo simulations at κ=0.175, κ is the hopping parameter. By using the imaginary chemical potential for which the fermion determinant is positive and the Ferrenberg-Swendsen reweighting method, we perform simulations on lattice 83×4 with 4 being the temporal extent. By analytic continuation of the data to the real chemical potential μ, we obtain the transition temperature for the small chemical potential, and compare our results with others.
