介子

In conclusion, we find that the speed of light in a vacuum has a constant value regardless of the movement of the observer (our observations from the moving Earth), or the movement of the source of light (our observations of light emitted from the moving pion).

在这个结论中，我们发现真空中的光速有着恒定值，不管观察者的如何运动（我们的观察是在运动的地球上），也不管光源如何运动（我们观察的光由运动的介子发出）。

Electrical appliance screws, computer screws, toy screws, triangle screws, non-standard screws, cup head screws, nuts, plugboard screws, rivets, rivet bushings, cup nuts, combined screws

专业生产各类电器螺丝、电脑螺丝、玩具螺丝、三角螺丝，非标螺丝、杯头螺丝、螺母、介子、线路板螺丝、压铆件、铆钉衬套、罩形螺母、组合螺丝

We have also studied the hydrodynamics of the nuclear matter with spontaneous chiral symmetry breaking based on the Poisson bracket method. The effects of mass are included and the full hydrodynamic equation of pion is given. The possibility of the phase transition to pion condensation is also discussed.

在研究具有手征对称性自发破缺的核物质系统的流体动力学时，我们运用Poisson括号方法，建立了pion介子的完整的流体动力学方程，给出了色散关系并讨论了相变和pion凝聚的可能性。

When treat-ing the spectra, transition, scattering problems, we must use the semi-microscopicapproach. The main new conclusions in this thesis are following:We found the different shrinking effect in ∧ hypernuclei and 〓 hypernuclei, the shrink-ing effect in ∧ hypernuclei are confirmed in a recent experiment;We also found a new approach to treat the configuration mixing of ∧∧ hypernuclei and〓 hypernuclei and that the conversion process may change the spectra and widths of〓 hypernuclei;For the first time, we investigate the neutron star matter without the ∑ hyperon butwith the new meson 〓(975) and φ(1020), we found the contribution of 〓 and φ canmake the equation of state of neutron star soften, and the maximum mass of neutronstar reduces;we extract a set of optimum parameters of the optical potential for the scattering of 〓with nucleus, we found that the 〓 nucleus optical potential need a bigger imaginarypart.

本论文所取得的主要新成果是：独立揭示∧超核和〓超核的不同的收缩效应，其中∧超核的收缩效应被最新实验证实；提出了处理∧∧超核与〓超核混合态的新方法，并发现conversion过程使〓超核能谱和宽度改变；首次在中子星研究中在不包含∑超子的同时考虑新介子〓(975)和φ(1020)，并发现这可使中子星物质的状态方程变软、中子星半径变大、质量变小；独立提取了〓核光学势的一组最佳参数，并证明〓+核光学势要求一个较大的虚部。

This implies that the negative energy projectors'contributions are important in light pseudoscalar bound states.

这说明负能投影贡献在轻赝标介子系统中十分重要，为进一步做更加深入的工作指出了解决问题的途径。

By the study of pseudoscalar meson chiral Lagrangian in QCD, we develop certain useful techniques and experiences which we can generalized to other fields, for example, the investigation of electroweak chiral Lagrangian.

通过赝标介子手征拉氏量的QCD研究，我们发展的计算方法与获得的经验完全可以推广到诸如电弱有效拉氏量等其它领域的研究上去。

We then generalize the method to obtain QCD low energyeffective Lagrangians including the vector meson ρ and the pseudoscalar meson〓.

我们又将以上方法进行了推广，推导出了含矢量介子、含〓的低能有效手征拉氏量。

The results show that, when taking into account the contributions of negative energy projector operators, the BS formalism can yield form factors which are suitable for the measured semileptonic branching ratios, and the lighter the final state pseudoscalar is the more important role the negative energy would.

结果表明：当考虑负能投影算子的贡献时，BS框架能够给出合适的形状因子及与实验值符合的半轻子衰变分支比；赝标介子越轻，负能投影算子的贡献越重要。

The possibilityof searching for light neutral scalar or pseudoscalar Higgs particles fromsubthreshold neutral pion production experiments in nucleus--nucleuscollision is also investigated.

本文研究了在〓介子核一核碰撞中的阈下产生实验中寻找轻的中性标量或〓标Higgs粒子的可能性。

Assuming that the stratons are heavy and the interaction isdominantly a pseudoscalar potential and a static vector potential,we derive the SU(4)mass splitting for mesons.

在层子质量很重的假定下，考虑相互作用是赝标势和静矢势为主，导出了介子 SU(4)质量分裂公式。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。