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Abadie, J.,Abbott, B. P.,Abbott, R.,Abbott, T. D.,Abernathy, M.,Accadia, T.,Acernese, F.,Adams, C.,Adhikari, R. X.,Affeldt, C.,Agathos, M.,Agatsuma, K.,Ajith, P.,Allen, B.,Ceron, E. Amador,Amariutei, IOP Publishing 2012 The Astrophysical journal Vol.760 No.1
<P>We present the results of a search for gravitational waves associated with 154 gamma-ray bursts (GRBs) that were detected by satellite-based gamma-ray experiments in 2009-2010, during the sixth LIGO science run and the second and third Virgo science runs. We perform two distinct searches: a modeled search for coalescences of either two neutron stars or a neutron star and black hole, and a search for generic, unmodeled gravitational-wave bursts. We find no evidence for gravitational-wave counterparts, either with any individual GRB in this sample or with the population as a whole. For all GRBs we place lower bounds on the distance to the progenitor, under the optimistic assumption of a gravitational-wave emission energy of 10(-2) M-circle dot c(2) at 150 Hz, with a median limit of 17 Mpc. For short-hard GRBs we place exclusion distances on binary neutron star and neutron-star-black-hole progenitors, using astrophysically motivated priors on the source parameters, with median values of 16 Mpc and 28 Mpc, respectively. These distance limits, while significantly larger than for a search that is not aided by GRB satellite observations, are not large enough to expect a coincidence with a GRB. However, projecting these exclusions to the sensitivities of Advanced LIGO and Virgo, which should begin operation in 2015, we find that the detection of gravitational waves associated with GRBs will become quite possible.</P>
Exploring the sensitivity of next generation gravitational wave detectors
Abbott, B P,Abbott, R,Abbott, T D,Abernathy, M R,Ackley, K,Adams, C,Addesso, P,Adhikari, R X,Adya, V B,Affeldt, C,Aggarwal, N,Aguiar, O D,Ain, A,Ajith, P,Allen, B,Altin, P A,Anderson, S B,Anderson, W Institute of Physics 2017 Classical and quantum gravity Vol.34 No.4
<P>The second-generation of gravitational-wave detectors are just starting operation, and have already yielding their first detections. Research is now concentrated on how to maximize the scientific potential of gravitational-wave astronomy. To support this effort, we present here design targets for a new generation of detectors, which will be capable of observing compact binary sources with high signal-to-noise ratio throughout the Universe.</P>
Characterization of the LIGO detectors during their sixth science run
Aasi, J,Abadie, J,Abbott, B P,Abbott, R,Abbott, T,Abernathy, M R,Accadia, T,Acernese, F,Adams, C,Adams, T,Adhikari, R X,Affeldt, C,Agathos, M,Aggarwal, N,Aguiar, O D,Ajith, P,Allen, B,Allocca, A,Ceron IOP Publishing 2015 Classical and quantum gravity Vol.32 No.11
<P>In 2009-2010, the Laser Interferometer Gravitational-Wave Observatory (LIGO) operated together with international partners Virgo and GEO600 as a network to search for gravitational waves (GWs) of astrophysical origin. The sensitivity of these detectors was limited by a combination of noise sources inherent to the instrumental design and its environment, often localized in time or frequency, that couple into the GW readout. Here we review the performance of the LIGO instruments during this epoch, the work done to characterize the detectors and their data, and the effect that transient and continuous noise artefacts have on the sensitivity of LIGO to a variety of astrophysical sources.</P>
The characterization of Virgo data and its impact on gravitational-wave searches
Aasi, J,Abadie, J,Abbott, B P,Abbott, R,Abbott, T D,Abernathy, M,Accadia, T,Acernese, F,Adams, C,Adams, T,Addesso, P,Adhikari, R,Affeldt, C,Agathos, M,Agatsuma, K,Ajith, P,Allen, B,Allocca, A,Ceron, E IOP Publishing 2012 Classical and quantum gravity Vol.29 No.15
P. Sathiya,P. M. Ajith,R. Soundararajan 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.8
The present study is focused on welding of super austenitic stainless steel sheet using gas metal arc welding process with AISI 904 L super austenitic stainless steel with solid wire of 1.2 mm diameter. Based on the Box - Behnken design technique, the experiments are carried out. The input parameters (gas flow rate, voltage, travel speed and wire feed rate) ranges are selected based on the filler wire thickness and base material thickness and the corresponding output variables such as bead width (BW), bead height (BH) and depth of penetration (DP) are measured using optical microscopy. Based on the experimental data, the mathematical models are developed as per regression analysis using Design Expert 7.1 software. An attempt is made to minimize the bead width and bead height and maximize the depth of penetration using genetic algorithm.
Hysteresis Performance of Through Bolted Connections in Steel Beam to Circular CFST Column
M. S. Ajith,K. P. Beena,S. Sheela 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.7
Concrete Filled Steel Tubes (CFSTs) with through bolt connections are demonstrated to be satisfactory for seismic performance. Due to better confinement effect, circular CFST columns possess higher strength to weight ratio compared to square CFST. The only limiting factor in application of circular CFST in construction is the difficulty in joining with the beams. This paper presents an experimental study on hysteretic behavior of interior joint between circular CFST column and steel beam using extended end plates with through bolt. The study focuses on the comparison of connection using flat extended end plate with straight bolts and curved extended end plate with split bolt assembly for circular CFST columns. The experimental results were analysed in terms of strength, stiffness, ductility, failure mode and energy dissipation for the evaluation of cyclic performance. The results indicate that the seismic resistance agrees with seismic recommendations of American Institute of Steel Construction (AISC) and the split bolt assembly increases the performance remarkably. For comprehension of mechanism and prediction of shear capacity of the panel zone for curved endplates, a mathematical model was generated. This includes the influence of axial load, prestressing induced by bolt tightening, anchorage and the concrete strut action. The prediction accuracy was compared with the test result and it showed sound correlation.
Strain induced structural transformation, mechanical and phonon stability in silicene derived 2D-SiB
Manju M.S.,Siby Thomas,Anees P.,Sang Uck Lee,Ajith K. M. 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
Two-dimensional monolayer SiB is a silicene derivative exhibiting buckling of atoms similar to that seenin silicene. This manuscript presents a systematic study of the strain-dependent variation of thestructural, mechanical, and dynamical properties of SiB. Strain was applied in the uniaxial armchair,uniaxial zigzag, and biaxial directions within the range of0.2 to 0.3. The resultant strain energy plotindicates anisotropic behavior of SiB in these directions. The SiB showed a mechanical strength that washigher than its counterpart, silicene, by an order of 30%. The elastic constant data from the undeformedSiB indicated an anisotropic nature, which was also seen with all the strain directions. Charge densitycontours, along with Bader charge analysis, confirmed the ionic nature of SiB in its original form. Thisnature became covalent as the strain varied from the compressive to the tensile regime in the uniaxialzigzag and biaxial directions. The majorfinding described in this manuscript is a newflat conformationhaving orthorhombic symmetry in contrast to the buckled structure. In addition, this material wasobserved to attain stability with the application of uniaxial tensile armchair and zigzag directionalstrains. Ab-initio molecular dynamics simulation confirmed the thermal stability of SiB in its newconformation.
Enhanced sensitivity of the LIGO gravitational wave detector by using squeezed states of light
Aasi, J.,Abadie, J.,Abbott, B. P.,Abbott, R.,Abbott, T. D.,Abernathy, M. R.,Adams, C.,Adams, T.,Addesso, P.,Adhikari, R. X.,Affeldt, C.,Aguiar, O. D.,Ajith, P.,Allen, B.,Amador Ceron, E.,Amariutei, D. Springer Science and Business Media LLC 2013 Nature photonics Vol.7 No.8