单片机PIC16C77应用中的几个问题

文章介绍了应用单片机PIC16C77的几点经验 ,包括对电源质量的要求 ;并行口使用中发现的几个问题 ;数据寄存器 (RAM )页面bank2和bank3的寻址。     

构造“可行域”例析范围题

“可行域”是指线性规划问题中目标函数z=f（x,y）的自变量x和y的取值区域．线性规划问题在近几年高考中备受青睐,题型从当初的简单、平常到如今的综合、创新,已经不断走向成熟．尤其值得关注的是一些难度较大的综合题,在方法上实现新突破,往往依赖于线性规划的相关知识的正迁移,通过构造“可行域”,     

核介质中π介子的衰变常数

研究了核介质中π介子衰变常数fπ 随核介质密度 ρ变化的规律 ,指出了随着核密度的增加fπ 逐渐减小。在正常核物质密度 ρ0 (=0 .17fm3 )时 ,fπ 减小百分之三十三左右。这对于研究核物质中介子动力学和相对论重离子碰撞中夸克胶子等离子体相变都是十分重要的。     

13C的一个可能的类晕的中子2p态

假设13C是单粒子的2p态的结构,用Glauber多重散射理论研究了入射能量为1GeV的质子在13C上的弹性散射,得到了与实验符合得很好的理论结果.这说明13C可能存在着一个类晕的中子皮.     

关于软坡密子的张量胶子球的内涵

通过把坡密子的轨迹跟观察到的量子数I^GJ^PC=0⁺2⁺⁺的同位旋标量的张量介子联系起来的关系,研究了坡密子的胶子球内涵.这些介子中有四个满足坡密子的自旋和质量的关系.这些坡密子的后选者可能是混合态.其中,f₂(2220)有极大的胶子球分量.讨论了关于这个介子宽度的实验争论,预言了它的理论下限,也阐明了在pp实验研究中观察不到f₂(2220)原因.     

夸克动力学质量的研究

夸克质量是标准模型中的一个基本的QCD输入参数,精确确定这个参数是十分重要的。通过研究了夸克传播子,并利用有效胶子传播子求解了耦合的Dyson-Schwinger方程,得到了夸克质量Mf(p2)随p2变化的关系。     

Temperature dependence of quarks and gluon vacuum condensate in the Dyson-Schwinger Equations at finite temperature

Based on the Dyson-Schwinger Equations (DSEs), the two-quark vacuum condensate, the four-quark vacuum condensate, and the quark gluon mixed vacuum condensate in the non-perturbative QCD vacuum state are investigated by solving the DSEs with rainbow truncation at zero- and finite-temperature, respectively. These condensates are important input parameters in QCD sum rule with zero and finite temperature, and in studying hadron physics, as well as predicting the quark mean squared momentum m₀²-also called quark virtuality in the QCD vacuum state. The present calculated results show that these physical quantities are almost independent of the temperature below the critical point temperature T_c=131 MeV, and above T_c the chiral symmetry is restored. For comparison we calculate the temperature dependence of the "in-hadron condensate" for pion. At the same time, we also calculate the ratio of the quark gluon mixed vacuum condensate to the two-quark vacuum condensate by using these condensates, and the unknown quark mean squared momentum in the QCD vacuum state has been obtained. The results show that the ratio m₀²(T) is almost flat in the temperature region from 0 to T_c, although there are drastic changes of the quark vacuum condensate and the quark gluon mixed vacuum condensate at the region. Our predicted ratio comes out to be m₀²(T)=2.41 GeV² at the Chiral limit, which is consistent with other theory model predictions, and strongly indicates the significance that the quark gluon mixed vacuum condensate has played in the virtuality calculations.     

有限核中核子间的短程关联

The short-range correlation between nucleons in finite nuclei is investigated in high energy protonnucleus and α-nucleus elastic scattering in the framework of Glauber multiple scattering theory without any free parameters. The effects on the p-^4He and ^4He-^12C elastic scattering, and in particular on the proton elastic scattering off hallo-like nuclei, ^6,8He, are estimated. Our calculations show that the short-range correlations play an important role in reproducing experimental data and could be also thought of as being possible origin and nature of halo-like phenomena in the nuclear structure. More accurate calculations along this line are needed.     

从流夸克质量到组分夸克质量的动力学过渡的研究

在彩虹近似下用Dyson Schwinger 方程研究了禁闭夸克的传播子, 得到了夸克动力学质量随动量变化的关系, 即得到了从流夸克质量到组分夸克质量的动力学过渡.