[en] In order to analyze the influence of fracture water flow on the evolution of temperature in the near field of nuclear waste repositories, a mathematical model, taking into account of distributed heat source (s) and 3-D thermal conduction in a single-fracture rock mass of infinite ex- tent, is formulated and solved by using a Green function approach, in which a fundamental solution of the governing differential equations after Laplace transform is employed. Numerical examples are presented for analyses of the characteristics of advective-conductive heat transfer in a fractured rock mass and the sensitivities to the fracture water flow velocity and the distance between the heat sources. (authors)

[en] We propose a scheme for the quantum teleportation of an atomic state based on the detection of cavity decay. The internal state of an atom trapped in a cavity can be disembodiedly transferred to another atom trapped in a distant cavity by measuring interference of polarized photons through single-photon detectors. In comparison with the original proposal by Bose, Knight, Plenio, and Vedral [Phys. Rev. Lett. 83, 5158 (1999)], our protocol of teleportation has a high fidelity of almost unity, and inherent robustness, such as the insensitivity of fidelity to randomness in the atom's position, and to detection inefficiency. All these favorable features make the scheme feasible with the current experimental technology

[en] Highlights: • A simple solution method is used to make the particle-grown tube-like polyaniline. • Reaction time plays a great role on morphology and performance of polyaniline. • A C_F value of 437.8 F/g is got at 4 A/g for the tube-like polyaniline electrode. • Incorporating graphene oxide in polyaniline enhances electrochemical performance. • A C_F value of 475.0 F/g is obtained for the polyaniline/graphene oxide electrode. - Abstract: Polyaniline (PANI) is one of the most attractive materials for pseudocapacitors. To enhance the electrolyte diffusion and improve the electrochemical performance of the electrode, the well-designed morphology of PANI is required. Incorporating carbon materials is also benefic on enhancing the cycling stability as well as the mechanical and electrochemical properties of PANI. In this study, a simple solution method is applied to synthesize the particle-deposited tube-like PANI. Due to the well-defined structure, a specific capacitance (C_F) of 437.8 F/g is achieved at the current density of 4 A/g. Furthermore, the self-synthesized graphene oxide (GO) is simply mixed with the particle-deposited tube-like PANI to make a more efficient electrocapacitive material. An enhanced C_F value of 475.0 F/g is achieved for the optimized PANI/GO electrode, owing to the synergic effects of the pseudo-capacitance from PANI and the functional groups of GO, as well as the electrochemical double-layered capacitance from GO. After conducting 2000 cycles repeated charge/discharge process, the C_F retention of 90% and the average Coulombic efficiency of higher than 90% are also attained for the optimized PANI/GO electrode.

[en] Up to now, at least 806 carbon allotropes have been proposed theoretically. Three interesting carbon allotropes (named Pbam-32, P6/mmm, and $I\stackrel{¯<!--\; ??\; -->}{4}3d$) were recently uncovered based on a random sampling strategy combined with space group and graph theory. The calculation results show that they are superhard and remarkably stable compared with previously proposed metastable phases. This indicates that they are likely to be synthesized in experiment. We use the factor group analysis method to analyze their Γ -point vibrational modes. Owing to their large number of atoms in primitive unit cells (32 atoms in Pbam-32, 36 atoms in P6/mmm, and 94 atoms in $I\stackrel{¯<!--\; ??\; -->}{4}3d$), they have many Raman- and infrared-active modes. There are 48 Raman-active modes and 37 infrared-active modes in Pbam-32, 24 Raman-active modes and 14 infrared-active modes in P6/mmm, and 34 Raman-active modes and 35 Raman- and infrared-active modes in $I\stackrel{¯<!--\; ??\; -->}{4}3d$. Their calculated Raman spectra can be divided into middle frequency range from 600 cm⁻¹ to 1150 cm⁻¹ and high frequency range above 1150 cm⁻¹. Their largest infrared intensities are 0.82, 0.77, and 0.70 (D/Å)²/amu for Pbam, P6/mmm, and $I\stackrel{¯<!--\; ??\; -->}{4}3d$, respectively. Our calculated results provide an insight into the lattice vibrational spectra of these sp³ carbon allotropes and suggest that the middle frequency Raman shift and infrared spectrum may play a key role in identifying newly proposed carbon allotropes. (paper)