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Search Results: 1 - 10 of 144888 matches for " Sridhar B "
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Osteochondroma of the axis : letter to editor.
Sridhar K,Ramamurthi B
Neurology India , 2001,
R-Parity Violating Supersymmetry Explanation for Large t tbar Forward-Backward Asymmetry
B. C. Allanach,K. Sridhar
Physics , 2012, DOI: 10.1103/PhysRevD.86.075016
Abstract: We propose a supersymmetric explanation for the anomalously high forward backward asymmetry in top pair production measured by CDF and D0. We suppose that it is due to the t-channel exchange of a right-handed sbottom which couples to d_R and t_R, as is present in the R-parity violating minimal supersymmetric standard model. We show that all Tevatron and LHC experiments' t tbar constraints may be respected for a sbottom mass between 300 and 1200 GeV, and a large Yukawa coupling >2.2, yielding A_{FB} up to 0.18. The non Standard Model contribution to the LHC charge asymmetry parameter is Delta A_C^y=0.017-0.045, small enough to be consistent with current measurements but non-zero and positive, allowing for LHC confirmation in the future within 20 fb^-1. A small additional contribution to the LHC t tbar production cross-section is also predicted, allowing a further test. We estimate that 10 fb^-1 of LHC luminosity would be sufficient to rule out the proposal to 95% confidence level, if the measurements of the t tbar cross-section turn out to be centred on the Standard Model prediction.
Corporate Governance and Shareholder Activism in India—Theoretical Perspective  [PDF]
Iragavarapu Sridhar
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.64077
Abstract: The origin of division of powers between Board of Directors and Shareholders has been subject of different judicial interpretations. Company law is a standard federal law. Hence, it envisages a clear division of powers between Shareholders and Board of Directors. The purpose of this paper is to analyse the methods and role envisaged for shareholders in corporate governance, given the little incentives and limited means available to them to perform any supervisory function over Board of Directors. The study reports, that it is difficult to tie down any definite role for investors in corporate governance. Corporate governance ought to shift from being a procedural requirement when it comes to addressing the issue of shareholder activism. An implication of the study is to put emphasis for enforcement of shareholder rights through civil proceedings. This can be achieved by introducing substantive provisions codifying duty of care, fiduciary role-playing requirements for Board of Directors.
Growth and Characterization of Dichloro Tris(Triphenyl Phosphine Oxide)Cadmium(II) —Second Harmonic Generation from a Centrosymmetric Crystal  [PDF]
K. Sreevani, K. Thangaraj, K. Ramamurthi, S. Selvanayagam, B. Sridhar, V. V. Anierudhe
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2013, DOI: 10.4236/jmmce.2013.11004
Abstract: The title compound dichloro tris(triphenyl phosphine oxide)cadmium(II) were grown by slow cooling method from aqueous solution. The title compound was synthesized and purified by repeated crystallization process. Grown crystals were characterized by X-ray diffraction and FTIR analysis. The range of optical transmission was determined by recording UV-Vis-NIR spectrum. Thermal properties were investigated by DTA and TGA analyses. Its mechanical hardness was estimated by Vickers microhardness method.
Darifenacin hydrobromide
S. Selvanayagam,B. Sridhar,K. Ravikumar
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809017085
Abstract: In the title compound {systematic name: (S)-3-[(aminocarbonyl)diphenylmethyl]-1-[2-(2,3-dihydrobenzofuran-5-yl)ethyl]pyrrolidinium bromide}, C28H31N2O2+·Br , the pyrrolidine rings adopts an envelope conformation. The two phenyl rings make a dihedral angle of 72.5 (1)°. The four coplanar atoms of the pyrrolidine ring makes dihedral angles of 33.1 (2) and 82.8 (2)° with the two phenyl rings. The molecular conformation is influenced by a C—H...O interaction. In the crystal packing, there are two N—H...Br hydrogen bonds running in opposite directions. They appear to form C(10) and C(9) chain motifs in the unit cell. In addition, the molecular packing is further stabilized by C—H...Br and C—H...O hydrogen bonds. The C atom bonded to the benzofuran ring system is disordered in a 0.66:0.34 ratio.
Erlotinib hydrochloride: an anticancer agent
S. Selvanayagam,B. Sridhar,K. Ravikumar
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808011707
Abstract: In the cation of the title compound, C22H24N3O4+·Cl , an active ingredient of the anticancer drug also known as Tarceva, the quinazoline ring system is planar within 0.044 (3) . The dihedral angle formed by the mean planes of the two six-membered quinazoline rings is 3.2 (1)°. Both N-bound H atoms participate in N—H...Cl bonds, which link the ions into infinite chains running along the b axis. C—H...O interactions involving neighboring cations provide additional stabilization of these aggregates.
Preparation and evaluation of transdermal drug delivery system of etoricoxib using modified chitosan
Wahid A,Sridhar B,Shivakumar S
Indian Journal of Pharmaceutical Sciences , 2008,
Abstract: In the present investigation chitosan has been chemically modified by treating with two different aldehydes like acetaldehyde and propionaldehyde to form Schiff′s bases. Schiff′s bases of chitosan with acetaldehyde and propionaldehyde were named as polymer A and polymer B, respectively. Fourier Transform Infra Red (FTIR) spectral data have confirmed the reaction carried out on chitosan. Drug free polymeric films of chitosan, chemically modified chitosan and chitosan/hydroxypropylmethylcellulose blend were prepared and evaluated for various physicochemical characters. Further, the films were incorporated with anti-inflammatory drug, etoricoxib using glycerol as plasticizer. The drug loaded films were cross-linked with sodium citrate and studied for permeation characteristics across dialysis membrane and rat skin. All the films were evaluated for bursting strength, swelling index, moisture uptake, thickness uniformity, drug content uniformity, tensile strength, percent elongation at break, percent flatness, water vapour transmission rate and in vitro drug permeation study.
Development and evaluation of pH-dependent micro beads for colon targeting
Khan M,Sridhar B,Srinatha A
Indian Journal of Pharmaceutical Sciences , 2010,
Abstract: The purpose of this research was to develop and evaluate multiparticulates of alginate and chitosan hydrogel beads exploiting pH sensitive property for colon-targeted delivery of theophylline. Alginate and chitosan beads were prepared by ionotropic gelation method followed by enteric coating with Eudragit S100. All formulations were evaluated for particle size, encapsulation efficiency, swellability and in vitro drug release. In vitro dissolution studies performed following pH progression method demonstrated that the drug release from coated beads depends on coat weights applied and pH of dissolution media. Mechanism of drug release was found to be swelling and erosion-dependent. The studies showed that formulated alginate and chitosan beads can be used effectively for the delivery of drug to colon and a coat weight of 20% weight gain was sufficient to impart an excellent gastro resistant property to the beads for effective release of drug at higher pH values.
Non-perturbative unification in the light of LEP results
B. Brahmachari,U. Sarkar,K. Sridhar
Physics , 1993, DOI: 10.1142/S0217732393003779
Abstract: We consider an alternative to conventional GUTs originally proposed by Maiani, Parisi and Petronzio, where owing to the existence of extra fermion generations at some intermediate scale, the gauge couplings become large at high energies. We first comment on how the non- supersymmetric version of this scenario is ruled out; we then consider the two-loop evolution of the couplings in the supersymmetric extension of this scenario, and check whether such a scenario is feasible in the light of the precies values of couplings now available from LEP.
Resonant slepton production at the LHC in models with an ultralight gravitino
B. C. Allanach,Manoranjan Guchait,K. Sridhar
Physics , 2003, DOI: 10.1016/j.physletb.2004.02.049
Abstract: We examine resonant slepton production at the LHC with gravitinos in the final state. The slepton undergoes gauge decay into a neutralino and a lepton, the neutralino decays into a photon and a gravitino. By measuring the transverse masses of the gamma- G and the l-gamma- G subsystems it is possible to accurately reconstruct both the slepton and neutralino masses. In some regions of parameter space the slepton decays directly into a lepton and gravitino, giving an identical experimental topology to W production (l missing E_T). We present the novel matrix element squared for lepton-gravitino production. A peak in the tail of the lepton-missing momentum transverse mass distribution of the W provides a signature for the process and an accurate measurement of the slepton mass. We display the search reach for the LHC and 300 fb^{-1} of integrated luminosity.
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