Influence of the resonance characteristics of free-yaw small wind turbines on the performance

Variability of behavior within very short time periods is typical of a wind flow. Thus, the upwind horizontal axis wind turbine with passive yaw system represents a torsional oscillation system. The article aims to determine how the yaw oscillation impacts the wind turbine efficiency. Results of experimental study indicated that there are significant yaw angle fluctuations caused by a resonance phenomenon. Appearing of a resonant excitation leads to disproportional fluctuations of yaw angle about the mean value of 11.6° achieving the angle of 40°. Mathematical simulation of experimental wind turbine for conditions of observed phenomena showed a decrease of the efficiency at about 7 % achieving 47 % respectively

Right Handed Weak Currents in Sum Rules for Axialvector Constant Renormalization

The recent experimental results on deep inelastic polarized lepton scattering off proton, deuteron and $^{3}$He together with polari% zed neutron $\beta$-decay data are analyzed. It is shown that the problem of Ellis-Jaffe and Bjorken sum rules deficiency and the neutron paradox could be solved simultaneously by assuming the small right handed current (RHC) admixture in the weak interaction Lagrangian. The possible RHC impact on pion-nucleon $\sigma$-term and Gamow-Teller sum rule for $(p,n)$ nuclear reactions is pointed out.Comment: to be published in Phys. Rev. Lett. LaTeX, 8 pages, 21 k

Analysis of solar neutrino induced double beta processes for several nuclei

We investigate neutrino flux induced double beta transitions in targets built of Cd112, Cd114, Cd116 and O18 isotopes. In addition to known beta^- beta^- channel we consider new beta^- beta^+ and beta^- beta^+ gamma modes of the neutrino induced double beta process. A possibility of detection of the solar neutrinos via the induced double beta transitions of interest is discussed. We note that the beta^- part of the solar neutrino induced beta^- beta^+ process in O18 was already discussed in Ref. [9,10] in connection with a possible influence of high energy electron production of this origin on the SuperKamiokande results.Comment: 5 pages, LaTeX. Talk presented by S. V. Semenov on International Workhop on Non-Accelerator New Physics (NANP'01), Dubna, Russia, June 2001, to be published in Phys. Atom. Nucl. (2002

"The obesity paradox" in patients with atrial fibrillation according to the results of the REKUR-AF study

To evaluate the effect of excess body weight (EBW) and obesity on the survival of patients with atrial fibrillation (AF) in the REKUR-AF stud

Particle Motion in Rapidly Oscillating Potentials: The Role of the Potential's Initial Phase

Rapidly oscillating potentials with a vanishing time average have been used for a long time to trap charged particles in source-free regions. It has been argued that the motion of a particle in such a potential can be approximately described by a time independent effective potential, which does not depend upon the initial phase of the oscillating potential. However, here we show that the motion of a particle and its trapping condition significantly depend upon this initial phase for arbitrarily high frequencies of the potential's oscillation. We explain this novel phenomenon by showing that the motion of a particle is determined by the effective potential stated in the literature only if its initial conditions are transformed according to a transformation which we show to significantly depend on the potential's initial phase for arbitrarily high frequencies. We confirm our theoretical findings by numerical simulations. Further, we demonstrate that the found phenomenon offers new ways to manipulate the dynamics of particles which are trapped by rapidly oscillating potentials. Finally, we propose a simple experiment to verify the theoretical findings of this work.Comment: 9 pages, 8 figures, published in PR

Three-dimensional writing inside silicon using a 2-µm picosecond fiber laser

International audienc

Dynamics of local cytokine status in patients with parotid salivary gland sialadenosis depending on the treatment algorithm

Sialadenosis is a dystrophic disease of the salivary glands parenchyma, which leads to secretory disorders and hypertrophy of salivary glands. Sialadenitis develops in cases of secondary inflammation. Standard methods and medications for the treatment of sialadenosis lead to regression of clinical manifestations and remission. Usage of herbal extracts with prolonged action has a long-term local anti-inflammatory effect with minimal side effects, including those affecting oral mucosa. However, their use in the complex treatment of sialadenosis has been scarcely studied. Objective of our investigation was to estimate cytokine status dynamics in saliva from the parotid glands in the patients with sialadenosis and hypothyroidism during complex treatment which included the prolonged-action herbal remedy. 52 patients with sialadenosis of parotid salivary glands and hypothyroidism were divided into 2 groups: in the I group, 26 patients received basic therapy; in the II group, 26 patients received basic therapy + herbal drugs with prolonged effect as resorbable tablets. Control group consisted of 20 conditionally healthy people without disorders of parotid glands and thyroid gland. Comparative evaluation was performed 1 and 6 months after starting the treatment, with respect to clinical findings, sialometry and cytokine profile. The content of interleukins IL-1β, IL-6, IL-10 and tumor necrosis factor (TNF) was determined in saliva of parotid glands by ELISA technique. The 1st group of patients showed exacerbations within six months of basic treatment, and the sialometry data pointed to maintenance of decreased parotid function. In the 2nd group, when using basic treatment + herbal drugs, no clinical features of sialadenosis were evident within 6 months. The sialometry values were normalized, and the secretory function of the parotid glands was found to be increased. Therefore, it exerted an effect upon moisturization of oral mucosal and improvement quality of life in the patients. Regression of IL- 1β, IL-6 and TNF contents, and IL-10 increase in parotid gland secretions was significantly more pronounced at the terms of 1 and 6 months in cases treated with herbal drugs, compared to Group 1, where a conventional protocol was used. Addition of herbal drugs of prolonged action to the standard protocol of sialadenosis treatment is reasonable and effective