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Search Results: 1 - 10 of 117853 matches for " T. Ahilan "
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Histopathological Pattern of Endometrium: Hospital Based Study in Teaching Hospital, Batticaloa, Srilanka  [PDF]
Markandu Thirukumar, Sinnathurai Ahilan
Open Journal of Obstetrics and Gynecology (OJOG) , 2018, DOI: 10.4236/ojog.2018.811102
Abstract: Introduction: Abnormal uterine bleeding, either due to organic or be dysfunctional cause, is a common gynaecological problems. Methods: A retrospective, cross sectional, hospital-based study was done for a period of five and a half years included 1884 samples which were taken by endosampling as well as by curetting for the evaluation of several gynaecological symptoms. Results: The age distribution ranges from 16 to 83 years. 12.8% of (242/1884) samples were inadequate for a comprehensive diagnosis. The functional cause was the predominant in 1263 samples and organic causes were found in 379 sample. The menorrhagia is the commonest one and it is followed by post-menopausal bleeding and polymenorrhoea. Endometrial polyp was the predominant organic (46.9%) cause followed by (26.1%) simple endometrial hyperplasia without atypia. Most of the simple hyperplasia without atypia (49/99) and complex hyperplasia (10/28) also occurred in the same age group. Total 29 (1.5%) cases of carcinoma of endometrium were found and it was common (13/29) in 50 - 59 years of age. It was noted that (5/29) carcinoma occurred in less than 39 years of age.
Growth Rate Analysis of Wind Turbine Industry in India
T. Ahilan,K.P. Mohammed,S. Arumugham
International Journal of Electrical and Power Engineering , 2012,
Abstract: This study examines the relationship between the technology policy and industrial development of the wind turbine Industry in various Indian states and India. The electric power sector will be a primary target for deep reductions in CO2 emissions because electric power plants are among the largest and most manageable point sources of emissions. With respect to new capacity, wind power is currently one of the most inexpensive ways to produce electricity without CO2 emissions and it may have a significant role to play in a carbon constrained world. Yet, most research in the wind industry remains focused on near term issues, while energy system models that focus on century-long time horizons undervalue wind by imposing exogenous limits on growth. This study fills a critical gap in the literature by taking a closer look at the importance, growth and tariff of large-scale wind power.
From superconductivity near a quantum phase transition to superconducting graphite
S. S. Saxena,K. Ahilan,T. E. Weller,M. Ellerby
Iranian Journal of Physics Research , 2006,
Abstract: The collapse of antiferromagnetic order as a function of some quantum tuning parameter such as carrier density or hydrostatic pressure is often accompanied by a region of superconductivity. The corresponding phenomenon in the potentially simpler case of itinerant-electron ferromagnetism, however, remains more illusive. In this paper we consider the reasons why this may be so and summaries evidence suggesting that the obstacles to observing the phenomenon are apparently overcome in a few metallic ferromagnets. A new twist to the problem presented by the recent discoveries in ferroelectric symmetric systems and new graphite intercalate superconductors will also be discussed.
NMR investigation of spin correlations in BaCo2As2
K. Ahilan,T. Imai,A. S. Sefat,F. L. Ning
Physics , 2014, DOI: 10.1103/PhysRevB.90.014520
Abstract: We use NMR techniques to investigate the magnetic properties of BaCo2As2 single crystals, the non-superconducting end member of the Co-substituted iron-pnictide high Tc superconductor Ba(Fe1-xCox)2As2 with x = 1. We present 75As NMR evidence for enhancement of low frequency spin fluctuations below ~ 100 K. This enhancement is accompanied by that of static uniform spin susceptibility at the wave vector q = 0, suggesting that the primary channel of the spin correlations is ferromagnetic rather than antiferromagnetic. Comparison between the NMR Knight shift 75K and bulk susceptibility chi(bulk) data uncovers the presence of two separate components of spin susceptibility with distinct temperature dependences, presumably because multiple electronic bands crossing the Fermi energy play different roles in the electronic properties of BaCo2As2.
Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?
T. Imai,K. Ahilan,F. L. Ning,T. M. McQueen,R. J. Cava
Physics , 2009, DOI: 10.1103/PhysRevLett.102.177005
Abstract: Unlike the parent phases of the iron-arsenide high Tc superconductors, undoped FeSe is not magnetically ordered and exhibits superconductivity with Tc~9K. Equally surprising is the fact that applied pressure dramatically enhances the modest Tc to ~37K. We investigate the electronic properties of FeSe using 77Se NMR to search for the key to the superconducting mechanism. We demonstrate that the electronic properties of FeSe are very similar to those of electron-doped FeAs superconductors, and that antiferromagnetic spin fluctuations are strongly enhanced near Tc. Furthermore, applied pressure enhances spin fluctuations. Our findings suggest a link between spin fluctuations and the superconducting mechanism in FeSe.
^{59}Co NMR evidence for charge ordering below T_{CO}\sim 51 K in Na_{0.5}CoO_2
F. L. Ning,S. M. Golin,K. Ahilan,T. Imai,G. J. Shu,F. C. Chou
Physics , 2007, DOI: 10.1103/PhysRevLett.100.086405
Abstract: The CoO$_{2}$ layers in sodium-cobaltates Na$_{x}$CoO$_{2}$ may be viewed as a spin $S=1/2$ triangular-lattice doped with charge carriers. The underlying physics of the cobaltates is very similar to that of the high $T_{c}$ cuprates. We will present unequivocal $^{59}$Co NMR evidence that below $T_{CO}\sim51 K$, the insulating ground state of the itinerant antiferromagnet Na$_{0.5}$CoO$_{2}$ ($T_{N}\sim 86 K$) is induced by charge ordering.
19-F NMR Investigation of Iron-pnictide Superconductor LaFeAsO(0.89)F(0.11)
K. Ahilan,F. L. Ning,T. Imai,A. S. Sefat,R. Jin,M. A. McGuire,B. C. Sales,D. Mandrus
Physics , 2008, DOI: 10.1103/PhysRevB.78.100501
Abstract: We report 19-F NMR investigation of the new high temperature superconductor LaFeAsO(0.89)F(0.11) (Tc ~ 28K). We demonstrate that low frequency spin fluctuations exhibit pseudo gap behavior above Tc. We also deduce the London penetration depth lambda from NMR line broadening below Tc.
59Co and 75As NMR Investigation of the Lightly Doped Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04)
F. L. Ning,K. Ahilan,T. Imai,A. S. Sefat,R. Jin,M. A. McGuire,B. C. Sales,D. Mandrus
Physics , 2009, DOI: 10.1103/PhysRevB.79.140506
Abstract: We investigate the electronic properties of Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04) in the lightly electron-doped regime by 59Co and 75As NMR. We demonstrate that Co doping significantly suppresses the magnetic ordering temperature to the SDW state, T_{SDW}. Furthermore, ordered moments below T_{SDW} exhibit large distribution. Strong spin fluctuations remain even below T_{SDW}, persisting all the way down to 4.2 K. We find no signature of additional freezing of spin degrees of freedom unlike the case of the lightly hole-doped stripe phase of the cuprates.
The Electronic Phase Diagram of the Iron-based High Tc Superconductor Ba(Fe(1-x)Co(x))2As2 Under Hydrostatic Pressure (0 < x <0.099)
K. Ahilan,F. L. Ning,T. Imai,A. S. Sefat,M. A. McGuire,B. C. Sales,D. Mandrus
Physics , 2009, DOI: 10.1103/PhysRevB.79.214520
Abstract: We report comprehensive resistivity measurements of single crystalline samples of the Ba(Fe(1-x)Co(x))2As2 high Tc superconductor under hydrostatic pressure up to 2.75 GPa and over a broad concentration range, 0 < x < 0.099. We show that application of pressure progressively suppresses the SDW transition temperature, T_SDW, in the underdoped regime. There is no sign of pressure-induced superconductivity in the undoped BaFe2As2 down to 1.8 K, but applied pressure dramatically enhances Tc in the underdoped regime. The effect of pressure on Tc is very small in the optimally and overdoped regimes. As a consequence, the dome of the superconducting phase extends to x 0.02 under pressure. We discuss the implications of our findings in the context of a possible quantum phase transition between the SDW and superconducting phases.
NMR measurements of intrinsic spin susceptibility in LaFeAsO(0.9)F(0.1)
T. Imai,K. Ahilan,F. L. Ning,M. A. McGuire,A. S. Sefat,R. Jin,B. C. Sales,D. Mandrus
Physics , 2008, DOI: 10.1143/JPSJS.77SC.47
Abstract: We will probe the intrinsic behavior of spin susceptibility chi_(spin) in the LaFeAsO(1-x)F(x) superconductor (x ~ 0.1, Tc ~ 27K) using 19-F and 75-As NMR techniques. Our new results firmly establish the pseudo-gap behavior with Delta_(PG)/kB ~ 140K. The estimated magnitude of chi_(spin) at 290K, ~1.8x10^(-4) [emu/mol-Fe], is approximately twice larger than that in high Tc cuprates. We also show that chi_(spin) levels off below ~50K down to Tc.
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