Zobrazeno 1 - 10
of 437
pro vyhledávání: '"PICKARD, C."'
Fundamental physical constants govern key effects in high-energy particle physics and astrophysics, including the stability of particles, nuclear reactions, formation and evolution of stars, synthesis of heavy nuclei and emergence of stable molecular
Externí odkaz:
http://arxiv.org/abs/2406.08129
Autor:
Torres, M. I., Olaso, J. M., Montenegro, C., Santana, R., Vázquez, A., Justo, R., Lozano, J. A., Schlögl, S., Chollet, G., Dugan, N., Irvine, M., Glackin, N., Pickard, C., Esposito, A., Cordasco, G., Troncone, A., Petrovska-Delacretaz, D., Mtibaa, A., Hmani, M. A., Korsnes, M. S., Martinussen, L. J., Escalera, S., Cantariño, C. Palmero, Deroo, O., Gordeeva, O., Tenorio-Laranga, J., Gonzalez-Fraile, E., Fernandez-Ruanova, B., Gonzalez-Pinto, A.
The goal of active aging is to promote changes in the elderly community so as to maintain an active, independent and socially-engaged lifestyle. Technological advancements currently provide the necessary tools to foster and monitor such processes. Th
Externí odkaz:
http://arxiv.org/abs/2105.01878
Publikováno v:
Science Advances vol. 6, eabc8662 (2020)
Two dimensionless fundamental physical constants, the fine structure constant $\alpha$ and the proton-to-electron mass ratio $\frac{m_p}{m_e}$ are attributed a particular importance from the point of view of nuclear synthesis, formation of heavy elem
Externí odkaz:
http://arxiv.org/abs/2004.04818
Autor:
Smillie, L. A., Niihori, M., Rapp, L., Haberl, B., Williams, J. S., Bradby, J. E., Pickard, C. J., Rode, A. V.
Publikováno v:
Phys. Rev. Materials 4, 093803 (2020)
Confined microexplosions induced in silicon by powerful ultrashort laser pulses can lead to new Si phases. Some of these have not previously been observed via near-equilibrium compression of silicon. In this study, confocal Raman micro-spectroscopy a
Externí odkaz:
http://arxiv.org/abs/2003.14039
Publikováno v:
Phys. Rev. B 98, 224105 (2018)
We recently proposed a high-pressure and high-temperature P-62m-symmetry polymorph for CaF2 on the basis of ab-initio random structure searching and density-functional theory calculations [Phys. Rev. B 95, 054118 (2017)]. We revisit this polymorph us
Externí odkaz:
http://arxiv.org/abs/1811.08740
Publikováno v:
Phys. Rev. B 95, 054118 (2017)
We investigate the high-pressure behaviour of beryllium, magnesium and calcium difluorides using ab initio random structure searching and density functional theory (DFT) calculations, over the pressure range 0-70 GPa. Beryllium fluoride exhibits exte
Externí odkaz:
http://arxiv.org/abs/1702.00746
Density-functional-theory (DFT) calculations have been performed on the Li-Si and Li-Ge systems. Lithiated Si and Ge, including their metastable phases, play an important technological r\^ole as Li-ion battery (LIB) anodes. The calculations comprise
Externí odkaz:
http://arxiv.org/abs/1402.6233
Autor:
Ninet, S., Datchi, F., Dumas, P., Mezouar, M., Garbarino, G., Mafety, A., Pickard, C. J., Needs, R. J., Saitta, A. M.
We report experimental and theoretical evidence that solid molecular ammonia becomes unstable at room temperature and high pressures and transforms into an ionic crystalline form. This material has been characterised in both hydrogenated NH3 and deut
Externí odkaz:
http://arxiv.org/abs/1401.1419
Publikováno v:
Phys. Rev. Lett 107, 207402 (2011)
Quantum Monte Carlo calculations of the relaxation energy, pair-correlation function, and annihilating-pair momentum density are presented for a positron immersed in a homogeneous electron gas. We find smaller relaxation energies and contact pair-cor
Externí odkaz:
http://arxiv.org/abs/1104.5441
Publikováno v:
Phys. Rev. B 82, 035107 (2010)
Calculations of the relaxation energy, contact pair-correlation function, and annihilating-pair momentum density for a single positron immersed in a homogeneous electron gas are presented. We achieve an accurate description of the electron-positron c
Externí odkaz:
http://arxiv.org/abs/1002.4748