Analysis of the strong vertices of ΣcND∗\Sigma_cND^{*} and ΣbNB∗\Sigma_bNB^{*} in QCD sum rules

The strong coupling constant is an important parameter which can help us to understand the strong decay behaviors of baryons. In our previous work, we have analyzed strong vertices $\Sigma_{c}^{*}ND$, $\Sigma_{b}^{*}NB$, $\Sigma_{c}ND$, $\Sigma_{b}NB$ in QCD sum rules. Following these work, we further analyze the strong vertices $\Sigma_{c}ND^{*}$ and $\Sigma_{b}NB^{*}$ using the three-point QCD sum rules under Dirac structures $q\!\!\!/p\!\!\!/\gamma_{\alpha}$ and $q\!\!\!/p\!\!\!/p_{\alpha}$. In this work, we first calculate strong form factors considering contributions of the perturbative part and the condensate terms $\langle\overline{q}q\rangle$, $\langle\frac{\alpha_{s}}{\pi}GG\rangle$ and $\langle\overline{q}g_{s}\sigma Gq\rangle$. Then, these form factors are used to fit into analytical functions. According to these functions, we finally determine the values of the strong coupling constants for these two vertices $\Sigma_{c}ND^{*}$ and $\Sigma_{b}NB^{*}$.Comment: arXiv admin note: text overlap with arXiv:1705.0322

Different Oxygen Levels of Dimethyl Ether Combustion Influence Numerical Simulation

AbstractAiming at the dimethyl ether itself with oxygen, this paper simulate that how much less oxygen quantity Dimethyl ether combustion required than liquefied petroleum gas in the same fuel quantity, and obtain optimum normoxia of dimethyl ether desired. This paper simulated dimethyl ether, liquefied petroleum gas (LPG) combustion with the air for 10%, 20%, 30%, 40%, 50%, 90% Oxygen levels. Under the different oxygen levels ,the study found that the best oxygen levels dimethyl ether combustion needed is around 30%, and the best oxygen levels liquefied petroleum gas (LPG) combustion needed is around 50%, so that Oxygen levels dimethyl ether needed is less than liquefied petroleum gas (LPG) needed in the same amount of fuel