Results 1 - 10 of 24361
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[en] We investigate the effect of carbon (C) on helium (He) trapping in tungsten (W) using a first-principles method. We show C can effectively reduce the solution energy of He in the bulk W originated from the charge density redistribution. This leads to a strong attraction between He and C in W. We demonstrate the C–vacancy (C–V) complex can serve as a trapping center by reducing charge density in its vicinity to induce He nucleation in comparison with the defect-free W. The maximal number of He atoms that can be trapped by such C–V complex is 5, and He diffusion into the C–V complex is kinetically feasible. Further, it is found the binding energy of He to a C–V complex is weaker than that to a C-free vacancy, suggesting C will decrease the He trapping capability of vacancy. We thus propose that C plays a key role in He trapping behavior
[en] Two approximate formulae are given for the binding energies in Λ-hypernuclei and light nuclei by means of the (reduced) Poeschl-Teller and the Gaussian central potentials. Those easily programmable formulae combine the eigenvalues of the transformed Jacobi eigenequation and an application of the hypervirial theorems. (orig.)
[en] In this paper, we combined a photoinduced electron donor—an improved green fluorescent protein (EGFP)—and protein oxidants within the same chimeric polypeptide chain. Comparison of the photostability of EGFP and chimeric proteins both in the absence and in the presence of non-protein-bound oxidants in solution showed the efficiency of the created model electron transport chains.
[en] The search for nuclear states of mesons poses interesting problems for the nuclear and low energy hadron physics: the behavior of tightly bound nuclear systems with strongly correlated impurities, the new kind of binding mechanisms and the extension of effective low energy theories to the strange sector. These problems are briefly presented and a method of variational calculation of the binding energies is discussed.