Nuclear Model of Binding alpha-particles

The model of binding alpha-particles in nuclei is suggested. It is shown good (with the accuracy of 1-2%) description of the experimental binding energies in light and medium nuclear systems. Our preliminary calculations show enhancement of the binding energy for super heavy nuclei with Z~120.Comment: 4 pages, 2 figures, Will be puplished in World Scientific as Procs. Int. Symposium on Exotic Nuclei, "EXON - 2004", July 5 - 12, 2004, Peterhof, Russi

Using satellite radiometric and ground based lidar measurements for detection of cirrus clouds, containing ensembles of preferred oriented ice particles

In this paper present an example of joint analysis of the data of high-level cloud sensing with a ground based polarization lidar of Tomsk State University and satellite radiometer MODIS

Using Heart Rate Variability Monitoring for Dexmedetomidine Dosing in Neurointensive Care Patients

Aim: to validate the use of heart rate variability monitoring during dexmedetomidine administration in patients with brain injury of various etiologies.Material and methods. The study included 25 patients (14 male, 11 female, mean age 58.2±1.81 years) 20 and more days after traumatic brain injury (TBI) (n=9; 36%), acute stroke (n=4; 16%), anoxic brain injury (n=6; 24%), subarachnoid hemorrhage (SAH) (n=6; 24%). Dexmedetomidine was prescribed because of sympathetic hyperactivity as diagnosed by heart rate variability (HRV). The following indices were measured: SI (stress index, in normalized units [nu]), SDNN (standard deviation of all normal sinus RR intervals over 24 h, in ms), RMSSD (root-mean-square of successive normal sinus RR interval difference, in ms), pNN 50% (the percentage of successive normal sinus RR intervals >50 ms), TP (total power of the frequency spectrum, in ms2). HRV parameters were determined prior to dexmedetomidine infusion (baseline), on days 1–3, 4–5, 9–10, 15–20 of drug administration. Sympathetic hyperactivity was diagnosed by determining following values: SDNN < 13.31 ms, RMSSD < 5.78 ms, pNN 50% < 0.110%, SI > 900 nu, and TP < 200 ms2. Normal reference ranges for HRV parameters were as follows: SDNN (13.31–41.4 ms), RMSSD (5.78–42.3 ms), pNN5 0% (0.110–8.1%), SI (80–900 nu), and TP (200–2000 ms2).Results. The starting dose of dexmedetomidine for sympathetic hyperactivity was 0.12–0.24 µg/kg/hr (mean dose 0.16±0.01; total 200 µg/day). According to digital HRV data, the effective dose ED50 of dexmedetomidine was 0.26±0.03 µg/kg/hour (353.8±35.1 µg total per day) that was achieved on day 9–10 of drug administration.Conclusion. Electrophysiological neuromonitoring of the autonomic nervous system function increases the efficacy of dexmedetomidine administration in patients with brain injury of various etiologies

Measurement of ozone concentration in the lower stratosphere - upper troposphere

We describe an ozone lidar and consider an algorithm for retrieving the ozone concentration, taking into consideration the aerosol correction. Results of lidar measurements at wavelengths 299 and 341 nm well agree with model estimates, indicating that ozone is sensed with acceptable accuracies in the altitude range of about 6-18 km. It should be noted that the retrieved profiles of altitude distribution of ozone concentration more closely resemble those from satellite data than according to Krueger model. A lidar is developed and put into operation at Siberian Lidar Station (SLS) to measure the vertical ozone distribution (VOD) in the upper troposphere-lower stratosphere. Sensing is performed according to the method of differential absorption and scattering at wavelength pair 299/341 nm, which are respectively the first and second Stokes components of stimulated Raman scattering (SRS) conversion of the fourth harmonic of Nd:YAG laser (266 nm) in hydrogen

Atmospheric bistatic communication channels with scattering. Part 2. Field Experiments in 2013

Results of field experiments on the influence of atmospheric conditions and some instrumental characteristics on the quality of information transfer in a bistatic optoelectronic communication system (OECS) operating in the visible wavelengths range are considered. The length of the atmospheric channel reached 17 km. Radiation of a copper bromide vapor laser with a wavelength of 510.6 nm was used as a signal source. It is shown that bistatic or over-the-horizon OECSs can operate both under the conditions of a cloudy and cloud-free atmosphere. Average values and standard deviations of communication errors were estimated under different atmospheric-optical conditions when some characteristics of individual instrumentation units varied

Non-exponential spin relaxation in magnetic field in quantum wells with random spin-orbit coupling

We investigate the spin dynamics of electrons in quantum wells where the Rashba type of spin-orbit coupling is present in the form of random nanosize domains. We study the effect of magnetic field on the spin relaxation in these systems and show that the spatial randomness of spin-orbit coupling limits the minimum relaxation rate and leads to a Gaussian time-decay of spin polarization due to memory effects. In this case the relaxation becomes faster with increase of the magnetic field in contrast to the well known magnetic field suppression of spin relaxation.Comment: published version, minor change

РОБАСТНЫЙ АВТОПИЛОТ КАНАЛА ТАНГАЖА БЕСПИЛОТНОГО ЛЕТАТЕЛЬНОГО АППАРАТА

Automatic pitch control system of unmanned aircraft vehicles (UAVs) with different aerodynamic configuration and airframe construction is reflected here. Robust autopilot scheme is proposed for such control system. While adjusting the parameters of UAV’s control channel, robust autopilot scheme allows presetting autopilot the way the dynamic and transient errors of control system stay invariant under UAV changing. Computer modeling of robust autopilot confirms theory of the robust systems.Рассматривается система автоматического управления по тангажу при полете беспилотных летательных аппаратов (БЛА) с различной аэродинамической схемой и конфигурацией планера. Для такой системы предлагается робастная схема автопилота, которая позволяет при изменении параметров канала управления планера самолета подстраивать параметры автопилота так, чтобы динамические и переходные ошибки управления были постоянными при смене планера БЛА. Компьютерное моделирование робастного автопилота подтвердило правильность теории робастных систем