Non-geometric string backgrounds were proposed to be related to a nonassociative deformation of the space-time geometry. In the flux formulation of double field theory (DFT), the structure of mathematically possible non-associative deformations is analyzed in detail. It is argued that on-shell there should not be any violation of associativity in the effective DFT action. For imposing either th...

Let $D$ be a finite simple digraph with vertex set $V(D)$ and arcset $A(D)$. A twin signed total Roman dominating function (TSTRDF) on thedigraph $D$ is a function $f:V(D)rightarrow{-1,1,2}$ satisfyingthe conditions that (i) $sum_{xin N^-(v)}f(x)ge 1$ and$sum_{xin N^+(v)}f(x)ge 1$ for each $vin V(D)$, where $N^-(v)$(resp. $N^+(v)$) consists of all in-neighbors (resp.out-neighbors) of $v$, and (...

Abstract Based on the three-dimensional field of molten pool and twin-roll strip casting experiments, this work verified cracking mechanism by establishing mathematical model rolling experiments. The results showed that due to instability thermophysical inconsistency kiss curve height, newly solidified will undergo incompatible deformation through rolling. stress concentration appear around lar...

Abstract The microstructure characteristics in early stage shear localization of near-? Ti?6Al?2Zr?1Mo?1V titanium alloy were investigated by split Hopkinson pressure bar (SHPB) tests using hat-shaped specimens. microstructural evolution and deformation mechanisms specimens revealed electron backscattered diffraction (EBSD) method. It is found that the nucleation expansion adiabatic band (ASB) ...

Thermomechanical processes, such as forging, are important steps during manufacturing of superalloy components. The microstructural development processing, which controls the final component properties, is complex and depends on e.g., applied strain, strain rate temperature. In this study, we investigate effect process parameters dynamic post-dynamic recrystallization hot compression Ni-base Ha...

Background: Prediction of adverse perinatal and postnatal outcomes could be possible by using ultrasound Doppler evaluation, however there are some controversies regarding this issue in the literature. The goal of present study was to evaluate predictive value of Doppler indices in single and twin pregnancies during second trimester. Materials and Methods: This prospective study was conducted i...

In Multipregnancies, The careful control of Number of follicles in stimulation cycles and Number of embryos transferred in ART cycles is so important. Just twin pregnancies are reason for racial death (12- 15%). The risk for CP in twin pregnancies is 8 times more and for Triple is 47 times more than simple ones.Approximately all prenatal problems increase in multiple pregnancies and therefore t...

The initial texture effect of strain rate sensitivity response in magnesium alloys was studied using the quasi situ electron backscatter diffraction technique. accumulations, under uniaxial loading both tensile and compression along rolling direction, showed dependency. For AZ31 sheets with strong basal (max intensity to 11.2), twinning first occurs at onset plastic deformation, resulting macro...

In the current work, a fully implicit numerical integration scheme is developed for modeling twinning-induced plasticity using crystal framework. Firstly, constitutive formulation of twin-based micromechanical model presented to estimate deformation behavior steels with low stacking fault energy. Secondly, discretizing equations through time backward Euler method. A sub-stepping algorithm and t...