3,837 research outputs found
Summer Student Project Report by Volodymyr Yurchenko
No full textIn 2020, the ALICE experiment at CERN will restart collecting data with an upgraded detector. The ALICE upgrade includes the upgrade of the DAQ, the HLT and the offline systems into a new common Online-Offline computing system (O2). The prototype of this system was created to demonstrate the benefits of using new instruments to improve efficiency of computing system. This document is the report on project done by Volodymyr Yurchenko during Summer Student Program 2014. It describes the scope of fulfilled work concerning testing of the prototype of new computing system to be used during Run 3 in ALICE experiment and exploration of possibilities of using FairRoot and ZeroMQ to build data transport layer in the prototype
A kinematic analysis of the Yurchenko layout vault
No full textDespite its increasing popularity, there is a paucity of information on the Yurchenko layout compared to other families of vaults. More specifically, little is known if the characteristics of the pre-flight phase of the vault are different between gymnasts from different levels of performance. The purpose of the study is to analyse the characteristics of the pre-flight phase of the Yurchenko layout vault performed by a local National gymnast who competed in the recently concluded 2003 South East Asian Games and to compare the data with that of Olympic level gymnasts. This study seeks to determine if differences exist in the following parameters: a) pre-flight trajectory of the body center of mass (CM), b) shoulder flexion angle and c) the body angle of attack at the end of pre-flight. In addition, the study also seeks to determine if the CM linear velocities at initial horse impact, at end of horse impact, as well as the duration of impact, differ between the levels of performance. Video recording, at 200 Hz, of a female gymnast performing the Yurchenko layout vault was used in the two-dimensional (2D) kinematic analysis. Digitizing was carried out using the PEAK-Motus software to obtain the mechanical variables during the pre-flight and impact phase. In this study, the mean shoulder flexion angles recorded was 160.5 (±9.6) degrees, and this was consistent with those of Olympic gymnasts. The CM trajectory was also observed to be rising during preflight, a pathway required for good vaults. The largest body angle of attack for the local gymnast was only 27.3 degrees which was low compared to Olympic level gymnasts. At initial horse impact subject had a mean CM horizontal velocity of 3.4 (±1.24) m/s. This was reduced by 2.5 m/s to 0. 9 (±0.26) m/s at the end of horse impact. This is low compared to Olympic gymnasts reported in previous studies. The mean vertical velocity at initial horse impact was 1.4 (±0.56) m/s. At horse take-off, the vertical velocity increased by 1.0 m/sto 2.4 (±0.43) m/s. This is comparable to the published data on Olympic gymnasts. The results of the study will provide specific mechanical variables of the pre-flight phase of the Yurchenko vault for coaches to look out for during training. Additionally, the provision of empirical data will enable the coach to use it as the basis for future objective intervention programmes. Specifically, the subject needs to improve on her pre-flight body angle of attack and also to prevent the loss of CM horizontal velocity during horse impact
Approximate analytical mean-square response of an impacting stochastic system oscillator with fractional damping
No full textThe paper deals with the stochastic dynamics of a vibroimpact single-degree-of-freedom system under a Gaussian white noise. The system is assumed to have a hard type impact against a one-sided motionless barrier, located at the system's equilibrium. The system is endowed with a fractional derivative element. An analytical expression for the system's mean squared response amplitude is presented and compared with the results of numerical simulations
Metabolites of Marine Sediment-Derived Fungi: Actual Trends of Biological Activity Studies
No full textMarine sediments are characterized by intense degradation of sedimenting organic matter in the water column and near surface sediments, combined with characteristically low temperatures and elevated pressures. Fungi are less represented in the microbial communities of sediments than bacteria and archaea and their relationships are competitive. This results in wide variety of secondary metabolites produced by marine sediment-derived fungi both for environmental adaptation and for interspecies interactions. Earlier marine fungal metabolites were investigated mainly for their antibacterial and antifungal activities, but now also as anticancer and cytoprotective drug candidates. This review aims to describe low-molecular-weight secondary metabolites of marine sediment-derived fungi in the context of their biological activity and covers research articles published between January 2016 and November 2020
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
SYSTEMATIC REVIEW OF YURCHENKO VAULT KINETIC AND KINEMATIC INDICATORS
No full textThe aim of this article was based on determining the most relevant kinematic indicators in the Yurchenko vault technique, using the mechanical purposes of each phase as linking elements. A systematic qualitative review was carried out with an initial search of 67 scientific documents, of which 27 were selected by matching the Yurchenko key words, kinetic, kinematic and artistic gymnastics and their respective combinations. It was concluded that the main kinetic and kinematic indicators involved in this vault are: acceleration, speed, distance, displacement, trajectory, contact time, flight time, percentage of deformation and angular momentum that exert on the center of mass. The following article is proposed as a study instrument to guide in the correct direction of kinetic and kinematic factors to be considered in the effective execution of the Yurchenko vault technique
Stochastic response of a fractional vibroimpact system
No full textThe paper proposes a method to investigate the stochastic dynamics of a vibroimpact single-degree-of-freedom fractional system under a Gaussian white noise input. It is assumed that the system has a hard type impact against a one-sided motionless barrier, which is located at the system's equilibrium position; furthermore, the system under study is endowed with an element modeled with fractional derivative. The proposed method is based on stochastic averaging technique and overcome the particular difficulty due to the presence of fractional derivative of an absolute value function; particularly an analytical expression for the system's mean squared response amplitude is presented and compared with results obtained by numerical simulations
AYTY: A NEW LINE-LIST FOR HOT FORMALDEHYDE
No full textbegin{abstract}
The ExoMol [1] project aims at providing spectroscopic data for key molecules that can be used to characterize the atmospheres of exoplanets and cool stars. Formaldehyde (HCO) is of growing importance in studying and modelling terrestrial atmospheric chemistry and dynamics. It also has relevance in astrophysical phenomena that include interstellar medium abundance, proto-planetary and cometary ice chemistry and masers from extra-galactic sources. However there gaps in currently available absolute intensities and a lack of higher rotational excitations that makes it unfeasible to accurately model high temperature systems such as hot Jupiters. Here we present textbf{AYTY} [2], a new line list for formaldehyde applicable to temperatures up to 1500 . AYTY contains almost 10 million states reaching rotational excitations up to and over 10 billion transitions at up to 10 000 cm. The line list was computed using the variational ro-vibrational solver TROVE with a refined textit{ab-initio} potential energy surface and dipole moment surface.
end{abstract}
begin{thebibliography}{1}
bibitem{jt528}
J.~Tennyson and S.~N. Yurchenko.
newblock {em MNRAS}, 425:21--33, 2012.
bibitem{jt597}
A.~F. Al-Refaie, S.~N. Yurchenko, A.~Yachmenev, and J.~Tennyson.
newblock {em MNRAS}, 2015.
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COMPUTING SPECTRA OF OPEN-SHELL DIATOMIC MOLECULES WITH DUO
No full text\textsc{Duo} is a program designed to solve a coupled Schr{\"o}dinger
equation for the motion of nuclei of a given diatomic molecule
characterized by an arbitrary set of electronic states.\footnote{ S.N. Yurchenko, L. Lodi, J. Tennyson, and A.V. Stolyarov, \textit{Comput. Phys. Commun.} \textbf{202}, 262 (2016).}
\textsc{Duo} is capable of both refining potential energy curves (by
fitting data to experimental energies or transition frequencies) and producing line lists.
Our most recent results of applying \textsc{Duo} to produce hot line lists for open-shell diatomic molecules include NO,\footnote{A. Wong, S. N. Yurchenko,
P. Bernath, H. S. P. Mueller, S. McConkey, and J. Tennyson, \textit{Mon. Not. R. Astron. Soc.} \textbf{470}, 882 (2017).} SiH,\footnote{S. N. Yurchenko, F. Sinden, L. Lodi, C. Hill, M. N. Gorman, and J. Tennyson, \textit{Mon. Not. R. Astron. Soc.} \textbf{473}, 5324 (2018)} PS and PO,\footnote{L. Prajapat, P. Jagoda, L. Lodi, M. N. Gorman, S. N. Yurchenko, and J. Tennyson, \textit{Mon. Not. R. Astron. Soc.} \textbf{472}, 3648 (2017).} C,\footnote{S. N. Yurchenko, J. Tennyson, and et al, \textit{Mon. Not. R. Astron. Soc.} in preparation (2018).} SN and SH,\footnote{S. N. Yurchenko, W. Bond, M. N. Gorman, L. Lodi, L. K. McKemmish, W. Nunn, R. Shah, and J. Tennyson, \textit{Mon. Not. R. Astron. Soc.} submitted (2018)} and AlH.\footnote{H. Williams, P. C. Leyland, L. Lodi, S. N. Yurchenko, and J. Tennyson, \textit{Mon. Not. R. Astron. Soc.} in preparation (2018).}
The published version of \textsc{Duo} only considers truly bound states.
We are now working on extending \textsc{Duo} to treat quasi-bound or resonance states, or indeed the continuum itself, using the stabilization method.\footnote{A.U. Hazi, H.S. Taylor, \textit{Phys. Rev. A} \textbf{1}, 1109 (1970)} As an illustration, we present simulations of spectra of the quasi-bound system A~ -- X~ of AlH and of the continuum system A~ -- X~ and B~ -- X~ of NaCl
Roe deer (Capreolus capreolus) are a novel potential reservoir for human visceral leishmaniasis in the Emilia-Romagna region of northeastern Italy
No full textLeishmaniasis is a complex human disease caused by intracellular parasites of the genus Leishmania, predominantly transmitted by the bite of sand flies. In Italy, leishmaniasis is caused exclusively by Leishmania infantum, responsible for the human and canine visceral leishmaniases (HVL and CVL, respectively). Within the Emilia-Romagna region, two different foci are active in the municipalities of Pianoro and Valsamoggia (both in the province of Bologna). Recent molecular studies indicated that L. infantum strains circulating in dogs and humans are different, suggesting that there is an animal reservoir other than dogs for human visceral leishmaniasis in the Emilia-Romagna region. In this work, we analyzed specimens from wild animals collected during hunts or surveillance of regional parks near active foci of human visceral leishmaniasis for L. infantum infection in the province of Bologna. Out of 70 individuals analyzed, 17 (24%) were positive for L. infantum. The infection prevalence in hedgehogs (Erinaceus europaeus), roe deer (Capreolus capreolus), badgers (Meles meles), and bank voles (Myodes glareolus) was 80, 33, 25, and 11%, respectively. To distinguish the two strains of L. infantum we have developed a nested PCR protocol optimized for animal tissues. Our results demonstrated that most (over 90%) of L. infantum infections in roe deer were due to the strain circulating in humans in the Emilia-Romagna region
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