Condensed matter realization of a single Dirac cone fermions in two dimensions is long-standing issue. Here we report the discovery gapless half-quantized Hall conductance magnetically doped topological insulator heterostructure. It demonstrates that unit ${e}^{2}/h$ when parity symmetry preserved near Fermi surface. The point stable and protected by local topologically nontrivial band structur...

wellbore instability is a quite common event during drilling, and causes many problems such as stuck pipe and lost circulation. it is primarily due to the inadequate understanding of the rock properties, pore pressure, and earth stress environment prior to well construction. this study aims to use the existing relevant logs, drilling, and other data from offset wells to construct a precise mech...

A garbologia é o ramo de pesquisa da arqueologia dedicado ao estudo analítico resíduos deixados por uma dada população em busca informações sobre seus costumes. Um dos desafios nesse tipo estudo, também conhecido como do lixo, a necessidade escavar lixões e aterros sanitários estrutura desconhecida, forma obter melhor amostragem com menor custo possível. Este trabalho contribui para solução des...

The failure of rocks subjected to a general state of stress (σ1 ≥ σ2 ≥ σ3) has been studied since the pioneering true triaxial experiments conducted by Mogi [1]. In true triaxial tests, cuboidal specimens are subjected to fixed, and typically unequal, σ3 and σ2, while σ1 is increased until failure occurs (expressed by σ1 at failure, or σ1,peak). For each constant σ3, σ2 is varied from test to t...