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Proton dynamics in antiferroelectric CsH3(SeO3)2 single crystal investigated by 1H NMR measurements
B. Ndiaye,김용환,이무희,임애란 한국물리학회 2020 Current Applied Physics Vol.20 No.5
1H nuclear magnetic resonance (NMR) measurements have been performed to study the proton dynamics associated with the antiferroelectric transition of a hydrogen-bonded single crystal of CsH3(SeO3)2. Herein, 1H NMR spectrum, shift, linewidth, and spin-lattice relaxation rate 1/T1 are measured in the temperature range of 80–296 K with the c-axis parallel to a magnetic field of ~4.85 T. The spectrum exhibits a composite structure with two narrow peaks at 296 K; at a low temperature, this structure evolves into a single broad shape with three humps. This complex shape and evolution are deconvoluted into five or six components based on the number of inequivalent and disordered hydrogen sites. By estimating the chemical shift and linewidth for each proton site, we identify all peaks. The spin-lattice relaxation recovery exhibits a double-exponential behavior with two relaxation times, short T1S and extremely large T1L. Both T1S and T1L follow Arrhenius behavior. From the respective 1/T1(T), the activation energies for proton motion are measured to be small: 1.16 ± 0.1 and 0.83 ± 0.06 kJ/mol for T1S and T1L, respectively. While the static NMR data, chemical shift and linewidth, show no evidence for the transition, the dynamic data 1/T1L highlights a clear increase across TN = 145 K, which is possibly a signature of the transition.
Assane Dieng,Magatte Niang,Awa Ba Diallo,Maria Faye,Gora Lo,Serigne Mbaye Lo Ndiaye,Alioune Tine,Safietou Ngom Cisse,Habsa Diagne,Moustapha Cisse,Sény Ndiaye,Djibril Boiro,Ndiaye Halimatou Diop,Camara 대한미생물학회 2023 Journal of Bacteriology and Virology Vol.53 No.2
In nephrological pathology, incidence of bacteria is mainly correlated with theincreased use of central or peripheral venous catheters, which is unavoidable inhemodialysis. The aim of this study is to determine bacteriological etiologies ofbacteremia among hemodialysis patients between January and December 2021and to determine their antibiotics susceptibility profiles. Blood culture balloonsreceived from the Nephrology Department were immediately incubated in theBactec FX 40. With the detection of an alarm due to growing suspicion of micro-organisms, identification of the suspected germ and antimicrobial susceptibilitytesting were performed. 37 (53%) blood cultures were positive with a predomi-nance in women (54%). Gram negative bacteria was most isolated in bacteremiawith 59% rate. Among bacteria responsible of bacteremia, Staphylococcus aureus(n=13; 36%), Enterobacter cloacae (n=8; 22%), Escherichia coli (n=6; 16%) andKlebsiella pneumoniae (n=4; 11%) were most important. Regarding antibioticssusceptibility of bacteria, oxacillin (83%), tobramycin (92%), gentamycin (100%)and vancomycin (100%) were most active in S. aureus. For E. cloacae, cefepim(88%), cefixim (75%), tobramycin (88%), imipenem (100%) and tigecyclin (100%)were most active. Regarding of E. coli, imipenem (100%), ceftazidim (83%),cefoxitin (83%), amikacin (100%) and gentamicin (83%) were most active. Inconclusion, this study shows the high rate of bacteremia in nephrology depart-ment of CHNU Aristide Le Dantec with antibiotics more or less active.
June-Yi Lee,J. Marotzke,G. Bala,L. Cao,S. Corti,J. P. Dunne,F. Engelbrecht,E. Fischer,J. C. Fyfe,C. Jones,A. Maycock,J. Mutemi,O. Ndiaye,S. Panickal,T. Zhou,Maycock,J. Mutemi,O. Ndiaye,S. Panickal,T. 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
The chapter 4 of Working Group I contribution to the IPCC Sixth Assessment Report assesses simulations of future global climate change, spanning time horizons from the near term (2021-2040),mid-term (2041-2060), and long term (2081-2100) out to the year 2300. The chapter assesses physical indicators of global climate change, such as global surface air temperature, global land precipitation, Arctic sea-ice area and global mean sea level. Furthermore, the chapter covers indices and patterns of properties and circulation not only for mean fields but also for modes of variability that have global significance. Changes are assessed relative to both the recent past (1995-2014) and the 1850-1900 approximation to the pre-industrial period. The projections assessed in the chapter are mainly based on a new range of scenarios, the Shared Socio-economic Pathways (SSPs) used in the Coupled Model Intercomparison Project Phase 6 (CMIP6). Additional lines of evidence enter the assessment, especially for change in globally averaged surface air temperature and global mean sea level, while assessment for changes in other quantities is mainly based on CMIP6 results. After section 4.2 on the methodologies used in the assessment, Section 4.3 assesses projected changes inkey global climate indicators throughout the 21<SUP>st</SUP> century. Section4.4. covers near-term climate change and Section 4.5 assesses mid-term andlong-term climate change. Section 4.6 addresses the climate implications of climate policies including patterns of climate change expected for various global warming levels, climate goals, overshoot, and path-dependence, as well as the climate response the climate response to mitigation, Carbon Dioxide Removal, and Solar Radiation Modification. Section 4.7 assesses very long-term changes up to 2300 and climate-change commitment and the potential for irreversibility and abrupt climate change. The chapter concludes with Section4.8 on the potential for low-probability-high-impact changes.
Dynamic Optimization of Switching States of an Hybrid Power Network
Aristide Tolok Nelem,Pierre Ele,Papa Alioune Ndiaye,Salomé Ndjakomo Essiane,Mathieu Jean Pierre Pesdjock 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7
This paper presents the quality improvement of electric power and the optimization of the switching transient states. We have used a hybrid power generating network by combining the AHP (Hierarchical Process Analysis) and SASV (Automated Variable Structured Automation Systems) methods. This combination revisits the interest of the use of decision support methods in the management of the problem of source switching instants in a hybrid network. The results ensure not only optimal control, supervision, but also a considerable reduction in the repetitive switching that exists in such network and which is detrimental to sensitive loads; because it is perceived as power micro-interruptions. All data collected from different sources (photovoltaic field, battery, generator set and public electricity network), the models of this network and interconexion of different buses are presented.
Diop, Mamadou Abdoul,Rathinasamy, Sakthivel,Ndiaye, Abdoul Aziz Springer-Verlag 2016 MEDITERRANEAN JOURNAL OF MATHEMATICS Vol.13 No.5
<P>This paper deals with the existence,uniqueness and asymptotic behaviors of mild solutions to neutral stochastic delay functional integrodifferential equations with impulsive effects, perturbed by a fractional Brownian motion B (H) , with Hurst parameter . We use the theory of resolvent operators developed in Grimmer (Trans Am Math Soc 273(1982):333-349, 2009) to show the existence of mild solutions. An example is provided to illustrate the results of this work.</P>
Orientation of a MgB2 Powder in a Magnetic Field
강기혁,B. J. Mean,김성훈,B. Ndiaye,조병기,J. Y. Kim,이무희 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
We have attempted magnetic orientation of MgB2 powder grains in an epoxy resin under a 7-T horizontal magnetic field. The horizontal field was crucial to get rid of gravitational sedimentation by rotating the mixture of MgB2 powder grains and the epoxy resin along the horizontal axis. Since we did not know the principal axes and the magnitude of the magnetic anisotropy tensor for MgB2, we devised different alignment schemes assuming two cases: case I for the easy axis along the c-axis and case II for the two easy axes perpendicular to the c-axis. For each case, we built different rotation devices: namely, for case I, the rotation axis was parallel to the magnetic field whereas, for case II, it was perpendicular to the magnetic field. For both cases, the powder grains should be aligned along the rotation axis. For assessment of the c-axis alignment, X-ray diffraction (XRD) and 11B nuclear magnetic resonance (NMR) measurements were utilized. However, the XRD and 11B NMR data for both cases were the same as those for the powder sample and showed no evidence of orientation. For possible scenarios, we suggest two possibilities: negligible anisotropy of the magnetic susceptibility tensor and the large size of the ground MgB2 powder particles still in multi-grains.