Resonance Contributions to $\eta$ Photoproduction on the Nucleon in the Isobaric Model

The contributions of the resonances $S_{11}(1535)$, $S_{11}(1650)$, and $P_{11}(1710)$ to gamma nucleon $\rightarrow$ eta nucleon are found. In order to estimate model dependence of the obtained resonance characteristics, an isobaric models used for analysis. For the resonances considered, our analysis yields mass values compatible with those advocated by the Particle Data Group. We emphasise, however, that cross-section data alone are unable to pin down the resonance parameters and it is shown that the beam and or target asymmetries impose more stringent constraints on these parameter values. The amplitude transitions of Feynman diagrams at the center of mass frame used to find amplitude squares involving the s-channel, u-channel, and t-channel on Born term and resonance. The value of the differential cross section on the energy system used by 1.685 MeV up to 2.795 MeV.

HADRONIC FORM FACTORS IN THE γp→K+Λ PROCESS

We have investigated the effects of different hadronic form factors on the performance of an isobaric model developed for kaon photo-production off the proton. We found that there is no ideal form factor in this case. The dipole and generalized dipole form factors can help to nicely reproduce the differential cross-section and hyperon polarization data. However, in the case of double polarization data Cx and Cz the Gaussian form factor is found to be superior.

Theory Analysis of Biomass Molding Mould

The biomass molding is influenced by many factors such as moisture, temperature, Poisson ratio, particle size, length-radius ratio etc. This paper armed to learn the influence of pressures on the biomass molding with different diameter and mainly researched the forces the biomass undergone, including the relationships of molding pressure and the length-radius ratio and that molding pressure and the density. First the material molding process was analyzed and the infinitesimal isobaric model that is pressure vessel model was established. Then this paper analyzed the model and derived these specific mathematics relationships. According to the formulas, this paper used Matlab to program, handled the datum and got the relationship images of the molding pressure and the length-radius ratio and that the molding pressure and the density. Thus it was learned that in plastic deformation area, the pressure and mould radius have the linear relationship while in the shaping area, they have the hyperbolic relationship and the pressure and the length-radius ratio have the linear relationship; Molding density changes with pressure and radius in index.