Questions of authentication and standardization of white varieties of Ceylon tea imported to Russia

The article raises questions concerning the reasons for the falsification of white tea varieties in Russia, the possibility of determining its authenticity by instrumental and sensory methods. The technological process and parameters of brewing leaves of white tea varieties, for example, silver tea, are considered. The criteria for the organoleptic evaluation of the silver tea infusion are developed with repeated brewing by "spillage" metho

Current sheet bifurcation and collapse in electron magnetohydrodynamics

Inertial effects in nonlinear magnetic reconnection are studied within the context of 2D electron magnetohydrodynamics (EMHD) with resistive and viscous dissipation. Families of nonlinear solutions for relevant current sheet parameters are predicted and confirmed numerically in all regimes of interest. Electron inertia becomes important for current sheet thicknesses $\delta$ below the inertial length $d_{e}$. In this case, in the absence of electron viscosity, the sheet thickness experiences a nonlinear collapse. Viscosity regularizes solutions at small scales. Transition from resistive to viscous regimes shows a nontrivial dependence on resistivity and viscosity, featuring a hysteresis bifurcation. In all accessible regimes, the nonlinear reconnection rate is found to be explicitly independent of the electron inertia and dissipation coefficients.Comment: submitted to publicatio