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Search Results: 1 - 10 of 239163 matches for " Suvorova E. I. "
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Electron diffraction and high resolution transmission electron microscopy in the characterization of calcium phosphate precipitation from aqueous solutions under biomineralization conditions
Suvorova E. I.,Buffat P. A.
European Cells and Materials (ECM) , 2001,
Abstract: Calcium phosphate precipitation obtained from aqueous solutions at room and body temperature and pH 5.5-7.5 were investigated by high-resolution transmission electron microscopy (HRTEM), transmission electron diffraction, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Supersaturated solutions of calcium phosphates were prepared by different methods of mixing of the stock solutions: diffusion-controlled mixing in space, convection-controlled mixing on earth and forced mixing on earth and with typical physiological parameters (pH and temperature). Concentrations of the stock solutions, rate of solution mixing and duration of precipitation influence very strongly the chemical composition of the precipitation, the phase composition of individual crystals, their sizes, morphology and structure. Microdiffraction and HRTEM techniques showed an incontestable advantage on other techniques like SEM and XRD in the investigation of small particles and mixtures of calcium phosphates (hydroxyapatite and octacalcium phosphate) with different proportions.
Climatic variability of the mean flow and stationary planetary waves in the NCEP/NCAR reanalysis data
A. Yu. Kanukhina, E. V. Suvorova, L. A. Nechaeva, E. K. Skrygina,A. I. Pogoreltsev
Annales Geophysicae (ANGEO) , 2008,
Abstract: NCEP/NCAR (National Center for Environmental Prediction – National Center for Atmospheric Research) data have been used to estimate the long-term variability of the mean flow, temperature, and Stationary Planetary Waves (SPW) in the troposphere and lower stratosphere. The results obtained show noticeable climatic variabilities in the intensity and position of the tropospheric jets that are caused by temperature changes in the lower atmosphere. As a result, we can expect that this variability of the mean flow will cause the changes in the SPW propagation conditions. The simulation of the SPW with zonal wave number m=1 (SPW1), performed with a linearized model using the mean flow distributions typical for the 1960s and for the beginning of 21st century, supports this assumption and shows that during the last 40 years the amplitude of the SPW1 in the stratosphere and mesosphere increased substantially. The analysis of the SPW amplitudes extracted from the geopotential height and zonal wind NCEP/NCAR data supports the results of simulation and shows that during the last years there exists an increase in the SPW1 activity in the lower stratosphere. These changes in the amplitudes are accompanied by increased interannual variability of the SPW1, as well. Analysis of the SPW2 activity shows that changes in its amplitude have a different sign in the northern winter hemisphere and at low latitudes in the southern summer hemisphere. The value of the SPW2 variability differs latitudinally and can be explained by nonlinear interference of the primary wave propagation from below and from secondary SPW2.
Differences in effectiveness of antihypertensive therapy in men and women: losartan versus enalapril
E.I. Tarlovskaia,D.A. Suvorova,A.A. Sobolev
Rational Pharmacotherapy in Cardiology , 2011,
Abstract: Aim. To evaluate gender differences in effectiveness of antihypertensive therapy with losartan in comparison with enalapril therapy.Material and methods. Open-label controlled crossover study in parallel groups was conducted during 3 months. A total of 120 patients aged 20-45 years with arterial hypertension (HT) of 1 and 2 degree were split into 4 groups with 30 patients in each: 1A, 1B – men; 2A, 2B – women. For the first 6 weeks patients of the 1A, 2A groups received enalapril 5-20 mg while patients of 1B, 2B – received losartan 50-100 mg. Then the therapy was crosswise changed.Results. Initial blood pressure (BP) levels did not differ significantly in men and women. In women start therapy with losartan decreased systolic BP (BPs) more effectively than enalapril therapy did (18.2±5.4% vs 15.2±4.3%, р=0.02). In men enalapril and losartan start therapies did not show significant differences in BP reduction (13.8±4.5% vs 14.6±4.6%, р=0.539). Follicule-stimulating hormone (FSH) level in women correlated positively with age (r=0.826; p=0.0001), HT duration (r=0.498; p=0.0001), BPs level (r=0.466; p=0.001), microalbuminuria level (r=0.583; p=0.0001) and negatively – with glomerular filtration rate (r=-0.58; p=0.0001).Conclusion. Losartan is more effective than enalapril as a start therapy in 20-45-year-old women. In women FSH level correlates with age, HT duration, BPs and microalbuminuria levels, glomerular filtration rate.
TEC evidence for near-equatorial energy deposition by 30-keV electrons in the topside ionosphere
A. V. Suvorova,A. V. Dmitriev,L. -C. Tsai,V. E. Kunitsyn,E. S. Andreeva,I. A. Nesterov,L. L. Lazutin
Physics , 2013, DOI: 10.1002/jgra.50439
Abstract: Observations of energetic electrons (10 - 300 keV) by NOAA/POES and DMSP satellites at heights <1000 km during the period from 1999 to 2010 allowed finding abnormal intense fluxes of ~10^6 - 10^7 cm-2 s-1 sr-1 for quasi-trapped electrons appearing within the forbidden zone of low latitudes over the African, Indo-China, and Pacific regions. Extreme fluxes appeared often in the early morning and persisted for several hours during the maximum and recovery phase of geomagnetic storms. We analyzed nine storm-time events when extreme electron fluxes first appeared in the Eastern Hemisphere, then drifted further eastward toward the South-Atlantic Anomaly. Using the electron spectra, we estimated the possible ionization effect produced by quasi-trapped electrons in the topside ionosphere. The estimated ionization was found to be large enough to satisfy observed storm-time increases in the ionospheric total electron content determined for the same spatial and temporal ranges from global ionospheric maps. Additionally, extreme fluxes of quasi-trapped electrons were accompanied by the significant elevation of the low-latitude F-layer obtained from COSMIC/FORMOSAT-3 radio occultation measurements. We suggest that the storm-time ExB drift of energetic electrons from the inner radiation belt is an important driver of positive ionospheric storms within low-latitude and equatorial regions.
Statistical Characteristics of the Heliospheric Plasma and Magnetic Field at the Earth's Orbit during Four Solar Cycles 20-23
A. V. Dmitriev,A. V. Suvorova,I. S. Veselovsky
Physics , 2013,
Abstract: The review presents analysis and physical interpretation of available statistical data about solar wind plasma and interplanetary magnetic field (IMF) properties as measured in-situ at 1 A.U. by numerous space experiments during time period from 1964 to 2007. The experimental information have been collected in the OMNI Web/NSSDC data set of hourly averaged heliospheric parameters for last four solar cycles from 20th to 23rd. We studied statistical characteristics of such key heliospheric parameters as solar wind proton number density, temperature, bulk velocity, and IMF vector as well as dimensionless parameters. From harmonic analysis of the variations of key parameters we found basic periods of 13.5 days, 27 days, 1 year, and ~11 years, which correspond to rotation of the Sun, Earth and to the solar cycle. We also revealed other periodicities such as specific five-year plasma density and temperature variations, which origin is a subject of discussion. We have found that the distribution of solar wind proton density, temperature and IMF is very close to a log-normal function, while the solar wind velocity is characterized by a very broad statistical distribution. Detailed study of the variability of statistical distributions with solar activity was performed using a method of running histograms. In general, the distributions of heliospheric parameters are wider during maximum and declining phase of the solar cycle. More complicated behavior was revealed for the solar wind velocity and temperature, which distribution is characterized by two- or even tree-peak structure in dependence on the phase of solar cycle. Our findings support the concepts of solar wind sources in the open, closed and intermittent magnetic regions on the Sun.
Acoustic search for high-energy neutrinos in Lake Baikal: status and perspectives
V. Aynutdinov,A. Avrorin,V. Balkanov,I. Belolaptikov,D. Bogorodsky,N. Budnev,I. Danilchenk,G. Domogatsky,A. Doroshenko,A. Dyachok,Zh. -A. Dzhilkibaev,S. Fialkovskyk,O. Gaponenko,K. Golubkov,O. Gress,T. Gress,O. Grishin,A. Klabukov,A. Klimov,A. Kochanov,K. Konischev,A. Koshechkin,V. Kulepovk,D. Kuleshov,L. Kuzmichev,V. Lyashuk,E. Middell,S. Mikheyev,M. Milenink,R. Mirgazov,E. Osipova,G. Pan'kov,L. Pan'kov,A. Panfilov,D. Petukhov,E. Pliskovsky,P. Pokhil,V. Poleschuk,E. Popova,V. Prosin,M. Rozanov,V. Rubtzov,A. Sheifler,O. Suvorova,A. Shirokov,B. Shoibonov,Ch. Spiering,B. Tarashansky,R. Wischnewski,I. Yashin,V. Zhukov
Physics , 2009,
Abstract: We report theoretical and experimental results of on-going feasibility studies to detect cosmic neutrinos acoustically in Lake Baikal. In order to examine ambient noise conditions and to develop respective pulse detection techniques a prototype device was created. The device is operating at a depth of 150 m at the site of the Baikal Neutrino Telescope and is capable to detect and classify acoustic signals with different shapes, as well as signals from neutrino-induced showers.
Electron - nuclear recoil discrimination by pulse shape analysis
J. Elbs,Yu. M. Bunkov,E. Collin,H. Godfrin,O. Suvorova
Physics , 2007, DOI: 10.1007/s10909-007-9603-7
Abstract: In the framework of the ``ULTIMA'' project, we use ultra cold superfluid 3He bolometers for the direct detection of single particle events, aimed for a future use as a dark matter detector. One parameter of the pulse shape observed after such an event is the thermalization time constant. Until now it was believed that this parameter only depends on geometrical factors and superfluid 3He properties, and that it is independent of the nature of the incident particles. In this report we show new results which demonstrate that a difference for muon- and neutron events, as well as events simulated by heater pulses exist. The possibility to use this difference for event discrimination in a future dark matter detector will be discussed.
Rapid Determination of Sexually Transmitted Infections by Real-time Polymerase Chain Reaction Using Microchip Analyzer  [PDF]
O. Suvorova, A. Perchik, M. Slyadnev, O. Suvorova, A. Perchik, M. Slyadnev, D. Navolotskii, N. Mushnikov
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B001
Abstract: Development of non expensive and time-saving techniques based on the polymerase chain reaction (PCR) is of great importance for modern diagnostics. We considered a new approach for PCR determination of a variety of sexually transmitted infections using microchip analyzer “AriaDNA”, which had been tested using clinical samples in several medical institutions of St. Petersburg (Russia). The use of microchips containing lyophilized PCR reagents allows reducing significantly time of analysis and the number of manipulations thus preventing possible sample contamination.
The prototyping/early construction phase of the BAIKAL-GVD project
A. D. Avrorin,A. V. Avrorin,V. M. Aynutdinov,R. Bannasch,I. A. Belolaptikov,D. Yu. Bogorodsky,V. B. Brudanin,N. M. Budnev,I. A. Danilchenko,G. V. Domogatsky,A. A. Doroshenko,A. N. Dyachok,Zh-A. M. Dzhilkibaev,S. V. Fialkovsky,A. R. Gafarov,O. N. Gaponenko,K. V. Golubkov,T. I. Gress,Z. Honz,K. G. Kebkal,O. G. Kebkal,K. V. Konishchev,E. N. Konstantinov,A. V. Korobchenko,A. P. Koshechkin,F. K. Koshel,V. A. Kozhin,V. F. Kulepov,D. A. Kuleshov,V. I. Ljashuk,A. I. Lolenko,M. B. Milenin,R. A. Mirgazov,E. A. Osipova,A. I. Panfilov,L. V. Panjkov,A. A. Perevalov,E. N. Pliskovsky,V. A. Poleshuk,M. I. Rozanov,V. F. Rubtsov,E. V. Rjabov,B. A. Shaybonov,A. A. Sheifler,A. V. Skurikhin,A. A. Smagina,O. V. Suvorova,B. A. Tarashchansky,S. A. Yakovlev,A. V. Zagorodnikov,V. A. Zhukov,V. L. Zurbanov
Physics , 2013, DOI: 10.1016/j.nima.2013.10.064
Abstract: The Prototyping phase of the BAIKAL-GVD project has been started in April 2011 with the deployment of a three string engineering array which comprises all basic elements and systems of the Gigaton Volume Detector (GVD) in Lake Baikal. In April 2012 the version of engineering array which comprises the first full-scale string of the GVD demonstration cluster has been deployed and operated during 2012. The first stage of the GVD demonstration cluster which consists of three strings is deployed in April 2013. We review the Prototyping phase of the BAIKAL-GVD project and describe the configuration and design of the 2013 engineering array.
Sensitivity of Baikal-GVD neutrino telescope to neutrino emission toward the center of Galactic dark matter halo
A. D. Avrorin,A. V. Avrorin,V. M. Aynutdinov,R. Bannasch,I. A. Belolaptikov,D. Yu. Bogorodsky,V. B. Brudanin,N. M. Budnev,I. A. Danilchenko,S. V. Demidov,G. V. Domogatsky,A. A. Doroshenko,A. N. Dyachok,Zh. -A. M. Dzhilkibaev,S. V. Fialkovsky,A. R. Gafarov,O. N. Gaponenko,K. V. Golubkov,T. I. Gress,Z. Honz,K. G. Kebkal,O. G. Kebkal,K. V. Konischev,E. N. Konstantinov,A. V. Korobchenko,A. P. Koshechkin,F. K. Koshel,A. V. Kozhin,V. F. Kulepov,D. A. Kuleshov,V. I. Ljashuk,M. B. Milenin,R. A. Mirgazov,E. R. Osipova,A. I. Panfilov,L. V. Pan'kov,A. A. Perevalov,E. N. Pliskovsky,M. I. Rozanov,V. F. Rubtzov,E. V. Rjabov,B. A. Shaybonov,A. A. Sheifler,A. V. Skurihin,A. A. Smagina,O. V. Suvorova,B. A. Tarashansky,S. A. Yakovlev,A. V. Zagorodnikov,V. A. Zhukov,V. L. Zurbanov
Physics , 2014,
Abstract: We analyse sensitivity of the gigaton volume telescope Baikal-GVD for detection of neutrino signal from dark matter annihilations or decays in the Galactic Center. Expected bounds on dark matter annihilation cross section and its lifetime are found for several annihilation/decay channels.
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