Free-Free Absorption in Solar Atmosphere     

Dimitrijević  M. S.  Srećković  V. A.  Sakan  N. M.  Bezuglov  N. N.  Klyucharev  A. N. 《Geomagnetism and Aeronomy》2018,58(8):1067-1072

Geomagnetism and Aeronomy - The free-free i.e. electron-ion inverse “Bremsstrahlung” characteristics are determined for the case of the solar atmosphere as well as solar interior where...  相似文献   

A variationally consistent hyperstatic reaction method for tunnel lining design     

Hoang-Giang Bui  Jelena Nini&#x;  Ngoc-Anh Do  Daniel Dias  Günther Meschke 《国际地质力学数值与分析法杂志》2022,46(1):205-217

In this technical note, a consistent finite element formulation of the Hyperstatic Reaction Method (HRM) for tunnel linings design is proposed by introducing a variational consistently linearized formulation. It permits to consider a nonlinear interaction between a lining structure and the surrounding ground. Recent advances of the HRM in regard to the consideration of the nonlinear response of the segmented tunnel lining exposed to design loads use an iterative algorithm for solving the nonlinear system of equations. In the proposed Variationally consistent Hyperstatic Reaction Method (VHRM), a distributed nonlinear spring model representing the interaction between the lining and the ground soils is considered in a variationally consistent format. Computing the tangential spring stiffness via consistent linearization, and using Newton-Raphson iteration, requires significantly smaller number of iterations as compared to the original HRM model based on nodal springs. Furthermore, the method is applicable for simulations using solid finite elements (2D and 3D), as well as beam or finite shell elements, respectively.  相似文献