RESUMO
The structural properties of graphite, such as the interlayer equilibrium distance, the elastic constant, and the net layer binding energy, are obtained using the adiabatic-connection fluctuation-dissipation theorem in the random phase approximation. Excellent agreement is found with the available experimental data; however, our computed binding energy of 48 meV per atom is somewhat smaller than the one obtained by quantum Monte Carlo methods. The asymptotic behavior of the interlayer dispersion interaction, previously derived from analytic approximations, is explicitly demonstrated to follow a d-3 behavior at very large distances.
RESUMO
We resolve the long-standing controversy over the metal surface energy: Density-functional methods that require uniform-electron-gas input agree with each other, but not with high-level correlated calculations such as Fermi hypernetted chain and diffusion Monte Carlo calculations that predict the uniform-gas correlation energy. Here we apply the inhomogeneous Singwi-Tosi-Land-Sjölander method, and find that the density functionals are indeed reliable (because the surface energy is bulklike). Our work also vindicates the use of uniform-gas-based nonlocal kernels in time-dependent density-functional theory.
RESUMO
Thirty patients (32 elbows) who had surgery for tennis elbow were examined. Symptoms were present an average of 18 months before surgery. The operation was done percutaneously through an incision just distal to the lateral epicondyle, through which the common extensor origin was released. The followup period was 6 to 61 months, with an average of 26 months. Twenty-nine elbows had good or excellent results. In these 29, the pain was relieved an average of 9 weeks after surgery. Three elbows did not improve significantly, and treatment was considered a failure. The grip strength improved from an average of 60% of the opposite side before surgery to 90% after surgery.
