136 research outputs found
Yurchenko Vault's Springboard Phase
No full textIn the Yurchenko(YU)vault, the springboard phase(SB) influences the success and the quality of the vault. From the recent reviews there are no studies concerning the YUSB. The only information about it, are on temporal and velocities data. This study analyzes the linear and angular kinematics of the SB to provide a description of the total and the lower body. The first was studied by the center of mass(COM) velocities and the body’s angle. The second one was analyzed by the hip, knee and ankle angles.
Methods
18 YU of the 2006 Women Italian Championship were filmed using 3 cameras(BASLER 610 100Hz).Each movie was digitized with SIMI Motion.The COM was calculated with the Dempster model.
Results
In SB the horizontal velocity had a decrease of 1,24m/s (mean value mv) between the impact(IMP) and the takeoff(TKO). The vertical velocity at the IMP had a negative value due to the downward direction of the movement (–0,78m/s mv), and at the TKO its was 3,77m/s. The gymnasts hit and leave the SB with a great body’s angle(61° and 96°),so this angle covered a space of 35°(mv) during the SB. The hip is extended of 118°(mv) at the IMP and hyperextend of 195°(mv) at the TKO. The knee had a amortizing and pushing angle of 10° and 30°(mv),respectively. The ankle was flex of 90° at the IMP and its amortizing and pushing angles were 30° and 65°.
Conclusions
In SB the gymnasts exploit the decrease of the COM horizontal velocity to increase the vertical velocity essential to set up the successive phase on the vault, properly.The body’s angle data show that at the IMP, the gymnasts lean back about 30° from the vertical axis as in handspring and Tsukahara vaults.
About the lower body’s angles chain, the gymnasts used the hip joint only to generate the angular momentum and to produce the backward rotation. The knee and ankle joints was used to amortize the hit by the roundoff and then to push for the successive phase
Influence of predefined angle of attack on piezoelectric energy harvesting from transverse galloping of different bluff bodies
No full textThe development of smart Internet-of-Things (IoT) solutions requires sensor nodes to be placed at different locations of monitored structures. Wireless solutions are quite attractive because of their simplicity although requiring for local energy supply. In this context, this study investigates the influences of the predefined angle of attack on the piezoelectric energy harvesting based on transverse galloping of different bluff bodies. The investigation is based on a lumped electro-aero-mechanical model with linear electrical and mechanical properties and nonlinear aerodynamic forces evaluated using the quasi-steady theory. The performances of energy harvesters with six different bluff bodies are analyzed at various predefined angles of attack: four rectangular cross-sections with different width-to-height ratios (i.e., b/d), one trapezium section, and one equal angle section. The main purpose is to understand the sensitivity of various bluff body-based energy harvesters on the predefined angle of attack, and further suggest a bluff body-based energy harvester that is robust to the predefined angle of attack. The results show that the response is quite dependent on the characteristic of the electro-mechanical system and the bluff body cross-section and angle of attack. In all cases, the load resistance should be tuned to maximize energy production. The largest vibration amplitude (i.e., largest power output) is predicted for the rectangular bluff body with b/d = 1.0 at a 0° angle of attack. However, its performances are quite dependent on the angle of attack, resulting in a zero-power output for an angle of attack exceeding 4°. A rectangular bluff body with b/d within 1.62 to 2.5 exhibits a reduced energy production compared with b/d = 1.0 at a 0° angle of attack but better robustness varying the angle of attack. Finally, the trapezium and the angle bluff bodies are not suitable for energy harvesting due to their very high onset velocities within the considered range of angles of attack
ExoMol line lists - III. An improved hot rotation-vibration line list for HCN and HNC
No full textA revised rotation-vibration line list for the combined hydrogen cyanide (HCN)/hydrogen isocyanide (HNC) system is presented. The line list uses ab initio transition intensities calculated previously and extensive data sets of recently measured experimental energy levels. The resulting line list has significantly more accurate wavelengths than previous ones for these systems. An improved value for the separation between HCN and HNC is adopted, leading to an approximately 25 per cent lower predicted thermal population of HNC as a function of temperature in the key 2000 to 3000 K region. Temperature-dependent partition functions and equilibrium constants are presented. The line lists are validated by comparison with laboratory spectra and are presented in full as supplementary data to the article and at www.exomol.com
Trypanosomatids are common and diverse parasites of Drosophila
No full textDrosophila melanogaster is an important model system of immunity and parasite resistance, yet most studies use parasites that do not naturally infect this organism. We have studied trypanosomatids in natural populations to assess the prevalence and diversity of these gut parasites. We collected several species of Drosophila from Europe and surveyed them for trypanosomatids using conserved primers for two genes. We have used the conserved GAPDH sequence to construct a phylogenetic tree and the highly variable spliced leader RNA to assay genetic diversity. All 5 of the species that we examined were infected, and the average prevalence ranged from 1 to 6%. There are several different groups of trypanosomatids, related to other monoxenous Trypanosomatidae. These may represent new trypanosomatid species and were found in different species of European Drosophila from different geographical locations. The detection of a little studied natural pathogen in D. melanogaster and related species provides new opportunities for research into both the Drosophila immune response and the evolution of hosts and parasites.</p
State of hydrogen sulfide system in the rats brain under combined hyperhomocysteinemia and its correction
No full textZaichko Natalia V., Yurchenko Peter A., Filchukov Denis A. State of hydrogen sulfide system in the rats brain under combined hyperhomocysteinemia and its correction. Journal of Education, Health and Sport. 2015;5(3):183-188. ISSN 2391-8306. DOI: 10.5281/zenodo.16349
http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%283%29%3A183-188
https://pbn.nauka.gov.pl/works/549846
http://dx.doi.org/10.5281/zenodo.16349
Formerly Journal of Health Sciences. ISSN 1429-9623 / 2300-665X. Archives 2011 – 2014 http://journal.rsw.edu.pl/index.php/JHS/issue/archive
Deklaracja.
Specyfika i zawartość merytoryczna czasopisma nie ulega zmianie.
Zgodnie z informacją MNiSW z dnia 2 czerwca 2014 r., że w roku 2014 nie będzie przeprowadzana ocena czasopism naukowych; czasopismo o zmienionym tytule otrzymuje tyle samo punktów co na wykazie czasopism naukowych z dnia 31 grudnia 2014 r.
The journal has had 5 points in Ministry of Science and Higher Education of Poland parametric evaluation. Part B item 1089. (31.12.2014).
© The Author (s) 2015;
This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland and Radom University in Radom, Poland
Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium,
provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License
(http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.
This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non commercial
use, distribution and reproduction in any medium, provided the work is properly cited.
The authors declare that there is no conflict of interests regarding the publication of this paper.
Received: 20.01.2014. Revised 27.02.2015. Accepted: 12.03.2015.
STATE OF hydrogen SULFIDE SYSTEM IN the rats brain UNDER COMBINED hyperhomocysteinemia and its CORRECTION
Natalia V. Zaichko, Peter A. Yurchenko, Denis A. Filchukov
Department of biological and general chemistry,
National Pirogov Memorial Medical University, Vinnytsya, Ukraine
Abstract
The state of hydrogen sulfide (H2S) system was investigated in the brain of rat under combined hyperhomocysteinemia (HHC) and its correction by betaine, vitamins B6, B9, B12 and trace element complex Esmin. Animals hold 14-days on starch-casein diet with 1% methionine in the absence of vitamins B6, B9, B12 caused increase in homocysteine serum to 12.0 times. Combined HHC induced significant decrease in H2S content and inhibition of H2S-synthesizing enzymes in rat’s brain. Normalization of diet, administration of vitamins B6, B9, B12 and Esmin for 7 days caused a decrease in serum homocysteine and increasing H2S content in rat brain. Betaine administration also decreased HHC and but the effect on H2S system in rat brain was not significant.
Keywords: homocysteine, hydrogen sulfide, enzymes, metabolism, brain, betaine, vitamins, trace element complex
EXOMOL: MOLECULAR LINE LISTS FOR EXOPLANET AND OTHER ATMOSPHERES
No full textAuthor Institution: Department of Physics and Astronomy, University College London, London, WC1E 6BT, UK; Technische Universitat Dresden, Physikalische Chemie, D--01062 Dresden, GermanySpectral characterization of astrophysical objects cool enough to form molecules in their atmospheres (cool stars, extrosolar planets and planetary discs) requires considerable amount of fundamental molecular data. The existing molecular line lists (with some exceptions) are however not sufficiently accurate and complete. We present a new (five years) European Union project ExoMol aimed at bridging this gap: ExoMol will generate comprehensive line lists for \textit{all} molecules likely to be observable in exoplanet atmospheres in the foreseeable future. This is a huge undertaking which will mean providing in excess of 10 spectral lines for a large variety of molecular species. %Although the calculation of a rotation-vibration line list for molecules %with three atoms is becoming more routine, the issues involved in %calculating such lists for larger species are formidable. %This will also require developing new procedures, particularly to deal with %the larger molecules of interest which, up until now, have been considered %to be beyond the sort of detailed study anticipated here. The physics of molecular absorptions is complex and varies between different classes of absorbers. The project will therefore be divided into following topics (a) diatomic, (b) triatomics, (c) tetratomics, (d) methane and (e) larger molecules. Each of which will require special techniques will be required in each case. The majority of diatomic systems to be tackled are open shell species involving a transition metal atom; the opacity is provided by the transitions between the many low lying electronic states of the system. The calculation of rotation-vibration line lists for closed-shell triatomic systems is now relatively straightforward provided enough care is taken in deriving the potential energy surface. For HS calculations are in progress: the unusual properties of the dipole moment will also require careful treatment. Accurate rotation-vibration line lists for hot tetratomic molecules such as ammonia, acetylene, hydrogen peroxide and formaldehyde, are at the very limit of what is computationally possible at present. These will be computed either by direct calculation of the full line list, such as our hot ammonia line list BYTe developed recently [S.~N. Yurchenko, R.~J. Barber , and J.~Tennyson, \textit{Mon. Not. R. Astron. Soc., in press}, (2011)], or by use of high accuracy vibrational calculations onto which the rotational structure will be grafted using ideas developed from the standard perturbation theory approach to molecular spectroscopy. Tests for acetylene suggest that this latter approach, although intrinsically less accurate, is still able to give reliable results [A. Urru, I. N. Kozin, G. Mulas, B. J. Braams, and J. Tennyson, \textit{Mol. Phys.}, \textbf{108}, 1973 (2010)]. Data from this project can be accessed at www.exomol.com. %The molecules listed in Table~1 are not unique to exoplanets and the data %will be widely used for models of cool stars and brown dwarfs, as well %non-thermal processes such as masers and molecular fluorescence which is %observed in comets. %\mbox{}\\ %[1] S.~N. Yurchenko, R.~J. Barber , and J.~Tennyson, \textit{Mon. Not. R. %Astron. Soc., in press}, (2010). %[2] A. Urru, I. N. Kozin, G. Mulas, B. J. Braams, and J. Tennyson, %\textit{Mol. Phys.}, \textbf{108}, 1973 (2010). %Figure~1 presents results obtained with our recent (high temperature) %ammonia line list BYTe. The current database of laboratory data is partial %even at 296 K: besides missing all data at short wavelengths, there are %artificial windows in the data (eg at 4000 cm). Our calculations are %comprehensive and accurate
Bioinformatics analysis for evaluation of the diagnostic potentialities of miR-19b, -125b and -205 as liquid biopsy markers of prostate cancer
No full textLight-controlled microwave whispering-gallery-mode quasi-optical resonators at 50W LED array illumination
No full textWe present experimental observations of light-controlled resonance effects in microwave whispering-gallery-mode quasi-optical dielectric-semiconductor disk resonators in the frequency band of 5 GHz to 20 GHz arising due to illumination from a light emitting diode (LED) of 50W power range. We obtain huge enhancement of photo-sensitivity (growing with the resonator Q-factor) that makes light-microwave interaction observable with an ordinary light (no laser) at conventional brightness (like an office lighting) in quasi-optical microwave structures at rather long (centimeter-scale) wavelength. We also demonstrate non-conventional photo-response of Fano resonances when the light suppresses one group of resonances and enhances another group. The effects could be used for the optical control and quasi-optical switching of microwave propagation through either one or another frequency channel. © 2015 Author(s)
Study of photosynthetic pigments in the hyperhaline Kuyalnik Estuary and its inflows (Ukraine, north-western Black sea region)
No full textPurpose. To investigate the interannual and intraannual analysis of the content of chlorophyll "a", "b", "c" and pheophytin in the Kuyalnik estuary (KE) and its tides for the period 2008-2012, to evaluate the spatial distribution of chlorophyll "a" in the water area of the estuary in different seasons year and reveal the connection of the specified characteristics with the abiotic factors of the environment.
Methods. Hydrochemical, biological and static analyses. The original geo-informational database of comprehensive monitoring of the KE basin was used.
Results. According to the results of generalization, analysis and systematization of the experimental studies materials of the photosynthetic pigments content (chlorophylls ‘a’, ‘b’, ‘c’) and pheophytin (the primary product of chlorophyll decomposition) in the surface waters of the hyperhaline Kuyalnik Estuary (KE) and its main water inflows (Velykyi Kuyalnyk river, drainage channels from the Peresyp and Korsuntsivsky ponds) during the period of low water content in the estuary (2008-2012) the interannual and intraannual distribution of pigment content is presented, their ratio in the specified water bodies and the spatial distribution of chlorophyll "a" content in the water area of KE in different seasons of the year are evaluated. It has been revealed that in the periods of low water content in KE and high salinization of its waters production activity is insignificant, but it does not stop. Adaptive mechanisms of algal communities in relation to extreme conditions of KE (salinization, decreasing of water level and increase of water temperature, decreasing of freshwater inflow) are expressed in an increase in the share of auxiliary pigments (chlorophylls "b" and "c"). The obtained ratios of pigments indicate mainly the dominance of diatom algae in all water bodies of the basin during the research period. A correlation analysis of the relationships between the concentrations of chlorophylls "a", "b", "c", concentrations of different chlorophylls and pheophytin and between chlorophyll "a" and the main abiotic factors of the environment (temperature, pH, dissolved oxygen in water, BOD₅, COD, ammonium nitrogen and phosphorus phosphate) were carried out.
Conclusions. The results of the study of the pigment fund Cl indicate that the characteristics of the content of photosynthetic pigments and their ratio can be used as integral characteristics of the productivity and ecological state of water bodies
Plasma Physics Reports V. 26, I. 09
No full textdc.description[en_US]Plasma Physics Reports -- September 2000
Volume 26, Issue 9, pp. 721-811
TOKAMAKS
Electrostatic Plasma Turbulence and Spitzer Longitudinal Conductivity in Tokamaks
S. N. Gordienko and �. I. Yurchenko
pp. 721-736 Full Text: PDF (179 kB)
Could Reversed-Field Pinches and Quasi-Helical Stellarators Benefit from Transport Suppression in Tokamaks?
V. V. Yankov and J. Nycander
pp. 737-740 Full Text: PDF (51 kB)
MAGNETIC CONFINEMENT SYSTEMS
Plasma Equilibrium in Axisymmetric Open Divertor Configurations
V. V. Arsenin and A. Yu. Kuyanov
pp. 741-744 Full Text: PDF (111 kB)
PLASMA DYNAMICS
Study of Hydrodynamic Instabilities of a Z-Pinch during a High-Current Explosion of a Thin Wire
S. Yu. Gus'kov, G. V. Ivanenkov, A. R. Mingaleev, V. V. Nikishin, S. A. Pikuz, V. B. Rozanov, W. Stepniewski, V. F. Tishkin, D. A. Hammer, and T. A. Shelkovenko
pp. 745-758 Full Text: PDF (944 kB)
Collisionless Expansion of a Plasma Cloud with Doubly Charged Ions in a Rarefied Magnetized Plasma
S. T. Surzhikov
pp. 759-771 Full Text: PDF (216 kB)
PLASMA OSCILLATIONS AND WAVES
Splitting of the Spectra of MHD Waves and the Structure of a Satellite Alfv�n Resonance in a Cold Plasma in a Strong Axial Magnetic Field and a Weak Helical Field
I. A. Girka
pp. 772-780 Full Text: PDF (106 kB)
Feasibility of Using Bernstein Modes for Current Drive in Toroidal Devices
O. B. Smolyakova and M. D. Tokman
pp. 781-785 Full Text: PDF (59 kB)
BEAMS IN PLASMA
Focusing of Heavy Ion Beams by a High-Current Plasma Lens
A. A. Goncharov, S. N. Gubarev, A. N. Dobrovol'skii, I. V. Litovko, and I. M. Protsenko
pp. 786-791 Full Text: PDF (81 kB)
LOW-TEMPERATURE PLASMA
Sterilization of Medical Products in Low-Pressure Glow Discharges
I. A. Soloshenko, V. V. Tsiolko, V. A. Khomich, A. I. Shchedrin, A. V. Ryabtsev, V. Yu. Bazhenov, and I. L. Mikhno
pp. 792-800 Full Text: PDF (118 kB)
Stability of the Low-Temperature States of High-Pressure Microwave Discharges
A. V. Zvonkov, A. V. Timofeev, and P. Handel
pp. 801-808 Full Text: PDF (107 kB)
BRIEF COMMUNICATIONS
Formation of Multiply Charged Ions in the Interaction of Laser Radiation with Targets of Various Densities
M. R. Bedilov, R. T. Khaidarov, and U. S. Kunishev
pp. 809-811 Full Text: PDF (48 kB)dc.description.contributor[en_US]dc.description.contributor[en_US
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