Comment on "Quantum Friction - Fact or Fiction?"

If quantum friction existed [J.B. Pendry, New J. Phys. 12, 033028 (2010)] an unlimited amount of useful energy could be extracted from the quantum vacuum and Lifshitz theory would fail. Both are unlikely to be true.Comment: Comment on J.B. Pendry, New J. Phys. 12, 033028 (2010

Renormalization group in the infinite-dimensional turbulence: third-order results

The field theoretic renormalization group is applied to the stochastic Navier-Stokes equation with the stirring force correlator of the form k^(4-d-2\epsilon) in the d-dimensional space, in connection with the problem of construction of the 1/d expansion for the fully developed fluid turbulence beyond the scope of the standard epsilon expansion. It is shown that in the large-d limit the number of the Feynman diagrams for the Green function (linear response function) decreases drastically, and the technique of their analytical calculation is developed. The main ingredients of the renormalization group approach -- the renormalization constant, beta function and the ultraviolet correction exponent omega, are calculated to order epsilon^3 (three-loop approximation). The two-point velocity-velocity correlation function, the Kolmogorov constant C_K in the spectrum of turbulent energy and the inertial-range skewness factor S are calculated in the large-d limit to third order of the epsilon expansion. Surprisingly enough, our results for C_K are in a reasonable agreement with the existing experimental estimates.Comment: 30 pages with EPS figure

Theory of friction: contribution from fluctuating electromagnetic field

We calculate the friction force between two semi-infinite solids in relative parallel motion (velocity $V$), and separated by a vacuum gap of width $d$. The friction force result from coupling via a fluctuating electromagnetic field, and can be considered as the dissipative part of the van der Waals interaction. We consider the dependence of the friction force on the temperature $T$, and present a detailed discussion of the limiting cases of small and large $V$ and $d$.Comment: 15 pages, No figure

Anomalous scaling in homogeneous isotropic turbulence

The anomalous scaling exponents $\zeta_{n}$ of the longitudinal structure functions $S_{n}$ for homogeneous isotropic turbulence are derived from the Navier-Stokes equations by using field theoretic methods to develop a low energy approximation in which the Kolmogorov theory is shown to act effectively as a mean field theory. The corrections to the Kolmogorov exponents are expressed in terms of the anomalous dimensions of the composite operators which occur in the definition of $S_{n}$. These are calculated from the anomalous scaling of the appropriate class of nonlinear Green's function, using an $uv$ fixed point of the renormalisation group, which thereby establishes the connection with the dynamics of the turbulence. The main result is an algebraic expression for $\zeta_{n}$, which contains no adjustable constants. It is valid at orders $n$ below $$, where $g_{\ast}$ is the fixed point coupling constant. This expression is used to calculate $\zeta _{n}$ for orders in the range $$ to 10, and the results are shown to be in good agreement with experimental data, key examples being $\zeta_{2}=0.7$, $\zeta_{3}=1$ and $$.Comment: REVTeX, 59 pages, icludes 8 .eps file

Nonlinear Diffusion Through Large Complex Networks Containing Regular Subgraphs

Transport through generalized trees is considered. Trees contain the simple nodes and supernodes, either well-structured regular subgraphs or those with many triangles. We observe a superdiffusion for the highly connected nodes while it is Brownian for the rest of the nodes. Transport within a supernode is affected by the finite size effects vanishing as $N\to\infty.$ For the even dimensions of space, $d=2,4,6,...$, the finite size effects break down the perturbation theory at small scales and can be regularized by using the heat-kernel expansion.Comment: 21 pages, 2 figures include

Organizational-economic aspects of innovative technologies in the field of pharmacy

This article presents the basic directions of scientific researches of the department of management and economics in pharmacy in the field of use of innovative technologies, such as research of expenses for medicinal therapy of various diseases, promotion of the medical products in the pharmaceutical market, studying of consumer behavior and working out of optimum models of operating and interaction of the pharmaceutical subjects

Comparative assessment of the results of open-, laparoscopic-, and laparoscopically assisted radical nephrectomies

Objectives. To compare the results of traditional open-, laparoscopic-, and laparoscopically assisted radical nephrectomies in the treatment of patients with renal cancer. One of the goals was to define the roll of laparoscopic operations and their advantages over open procedures.Subjects and methods. Seventy-four patients with renal cancer age of 36 to 79 years (mean age 58/7 years) were divided into 3 groups: 1) open radical nephrectomy (n = 32); 2) radical nephrectomy via laparoscopic transabdominal access (n = 17); and 3) radical nephrectomy via laparoscopically assisted access (n = 25). All the patient groups were comparable with regard to the T stage and the size of a tumor.Results. In the open nephrectomy group mean duration of surgery was 152 min; mean blood loss — 264 ml; mean hospital stay — 15.8 days; early postoperative complications were not observed. In the laparoscopic transabdominal surgery, these were 117 min, 138 ml, and 7.5, respectively; early postoperative complications were also absent. In laparoscopically assisted transabdominal access, the duration of an operation was 80 to 300 min (at the stage of procedure mastering) and averaged 123.1 min; blood loss was 50 to 700 ml (mean 228.5 ml). There were no intraoperative complications. The average postoperative hospital stay — 9.4 days.Conclusion. The results of open- and laparoscopic-access nephrectomies are comparable in the duration of an operation, the volume of blood loss, and the presence of intraoperative complications. The parameters of the early and late postoperative periods are also identical. Recovery is shorter when endovideo-assisted interventions are applied