Variational optimization of tensor-network states with the honeycomb-lattice corner transfer matrix

We develop a method of variational optimization of the infinite projected entangled pair states on the honeycomb lattice. The method is based on the automatic differentiation of the honeycomb lattice corner transfer matrix renormalization group. We apply the approach to the antiferromagnetic Heisenberg spin-1/2 model on the honeycomb lattice. The developed formalism gives quantitatively accurate results for the main physical observables and has a necessary potential for further extensions

Bunch-excited wakefield in dielectric waveguide with hollow plasma channel

Wakefield excitation by a single relativistic electron bunch in a plasma-dielectric accelerating structure has been studied both analytically and numerically. The structure represents a dielectric-loaded cylindrical metal waveguide, which has partially plasma-filled channel (the hollow plasma channel) to transport charged particles. Assuming the linear regime of excitation, analytical expressions have been derived for the longitudinal and radial wakefields generated by a finite-size electron bunch. Axial profiles of wakefield component amplitudes have been studied, and their mode and spectrum analyses have been performed. Furthermore, the electron bunch-driven wakefield excitation has been PIC-simulated numerically for the quasi-linear regime. The comparative analysis of the data resulting from analytical studies and the ones obtained by numerical simulation has demonstrated qualitative agreement between the results

Clinical-anatomical grounding for pancreatoduodenectomy with preservation of the lesser pancreas

The article presents clinical-anatomical grounding and the first clinical experience of pancreatoduodenectomy with preservation of the lesser pancreas. Implementation of this technique is feasible due to relative anatomical and functional isolation of the lesser pancreas. For the first time in Russia, in the Clinic of Hospital Surgery of Siberian State Medical University pancreatoduodenectomy surgery with preservation of the lesser pancreas was successfully performed in female patient with cancer of the head of pancreas. Pancreatoduodenectomy with preservation of the lesser pancreas enables to augment surgical radicality and to achieve endocrine function of the pancreas at the level requiring relatively low doses of insulin therapy if any. This approach increases the length of life in this category of patients and preserves the quality of life