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Marte MA 《Physical review letters》1995,74(24):4815-4818
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The computed values of the temperature dependent electrical resistivity is presented for the alkaline earth metals Ca, Sr
and Ba. Numerical values of the mean free paths obtained using a finite mean free path approach is also reported. The structure
factor has been evaluated using experimental values for the phonon spectra while local model potentials were used for the
form factors. Our numerical results compare favourably with experiments. 相似文献
6.
Michael Marte 《Annals of Operations Research》2007,155(1):207-225
This paper takes three important steps towards constraint-based school timetabling: (i) It proposes a constraint model that
covers many important requirements of school timetables by means of global constraints. (ii) It proposes a corresponding problem
solver that learns from its earlier faults and restarts to escape non-promising parts of the search space. (iii) By reporting
a large-scale computational study, it delivers a proof of concept. 相似文献
7.
We construct a solution to a 2 × 2 strictly hyperbolic system of conservation laws, showing that the Godunov scheme [13] can produce an arbitrarily large amount of oscillations. This happens when the speed of a shock is close to rational, inducing a resonance with the grid. Differently from the Glimm scheme or the vanishing‐viscosity method, for systems of conservation laws our counterexample indicates that no a priori BV bounds or L1‐stability estimates can in general be valid for finite difference schemes. © 2006 Wiley Periodicals, Inc. 相似文献
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A. Di Lieto P. Minguzzi A. Toncelli M. Tonelli H. P. Jenssen 《Applied physics. B, Lasers and optics》1996,62(5):443-447
We describe the continuous-wave (cw) operation of a LiYF4 laser based on crystals doped with different concentrations of Tm3+. We observed the fluorescence spectra from the upper laser level when the crystal is placed inside the laser resonator, in the same optical environment of the coherent emission. We measured the laser intensity as a function of pump power and obtained a 24% slope efficiency by selecting a suitable orientation of the crystal. Using all this information, we were able to demonstrate laser tunability at 1.9 µm in a 50 cm–1 wide interval. 相似文献
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The enthalpy of mixing of three liquid mixtures of NaF and NaMgF3 has been measured by drop calorimetry and was found to be negative. This energy release is attributed to a change in the equilibrium
Mg1/4[MgF2−4]3/4+f− å MgF2−4 to the formation of complex MgF2−4-ions. A ΔHM diagram for the system NaF-MgF2 up to 50 mol % MgF2 has been constructed. 相似文献
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Marte Rørvik Høyem 《Acta Appl Math》2010,109(1):61-73
We consider the Lie algebra that corresponds to the Lie pseudogroup of all conformal transformations on the plane. This conformal
Lie algebra is canonically represented as the Lie algebra of holomorphic vector fields in ℝ2≃ℂ. We describe all representations of
\mathfrakg\mathfrak{g}
via vector fields in J
0ℝ2=ℝ3(x,y,u), which project to the canonical representation, and find their algebra of scalar differential invariants. 相似文献